EP1108091A1 - Sweeping unit - Google Patents

Sweeping unit

Info

Publication number
EP1108091A1
EP1108091A1 EP00942073A EP00942073A EP1108091A1 EP 1108091 A1 EP1108091 A1 EP 1108091A1 EP 00942073 A EP00942073 A EP 00942073A EP 00942073 A EP00942073 A EP 00942073A EP 1108091 A1 EP1108091 A1 EP 1108091A1
Authority
EP
European Patent Office
Prior art keywords
adjusting
sweeping
roller brush
cylinder
unit according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00942073A
Other languages
German (de)
French (fr)
Other versions
EP1108091B1 (en
Inventor
Mauno Olavi Ruuska
Janko Tuskan
Clemens Rosa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schmidt Holding GmbH
Patria Vammas Oy
Original Assignee
Schmidt Holding GmbH
Patria Vammas Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schmidt Holding GmbH, Patria Vammas Oy filed Critical Schmidt Holding GmbH
Publication of EP1108091A1 publication Critical patent/EP1108091A1/en
Application granted granted Critical
Publication of EP1108091B1 publication Critical patent/EP1108091B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
    • E01H1/02—Brushing apparatus, e.g. with auxiliary instruments for mechanically loosening dirt
    • E01H1/05—Brushing apparatus, e.g. with auxiliary instruments for mechanically loosening dirt with driven brushes
    • E01H1/056—Brushing apparatus, e.g. with auxiliary instruments for mechanically loosening dirt with driven brushes having horizontal axes

Definitions

  • the present invention relates to a sweeping unit for mounting on a carrier vehicle or on a trailer, comprising a support frame and at least one motor-driven roller brush rotatably mounted therein about its longitudinal axis, the support frame having support wheels, the vertical distance from the axis of the roller brush by means of an adjusting unit is changeable, which comprises at least one adjusting member and a control unit.
  • Sweeping units of the type specified above are known in various versions, for example from European Patent 0372258 and German Offenlegungsschrift 3740215. Also known are further sweeping units which essentially have a generic structure, but differ from this in that the adjusting member does not have a Control unit is set, but rather is part of a hydraulic control circuit and that in addition the support frame does not have support wheels; Sweeping units of this type can be found, for example, in German patent applications 2455200 and 2821627 and in European patent applications 0189371 and 0843047.
  • the correct setting of the sweeping mirror width is of crucial importance for an efficient and material-saving sweeping operation.
  • the optimal sweeping mirror width is characterized by a good cleaning result with little bristle wear. Lies the sweeping mirror width below the optimal value noticeably reduces the cleaning performance. With a sweeping mirror width above the optimal value, however, the bristle wear increases noticeably without any noticeable improvement in the cleaning result.
  • sensors are used to measure the current diameter of the roller brush (depending on the bristle wear) and, depending on this measured value, the optimum distance between the axis of the roller brush and the surface to be cleaned is determined and set.
  • a time control is known in which the mileage of the respective roller brush determined by an operating hours counter is evaluated as an indicator of its wear and thus as a measure of the required readjustment. All methods are not free from disadvantages.
  • the detection of the current diameter of the roller brush by means of sensors requires a complicated sensor arrangement that cannot withstand the use in tough winter service.
  • the probe body can unfavorable weather conditions icing up and consequently reports a larger than the actual diameter of the roller brush.
  • the consequence of this is an unsatisfactory cleaning results because the rollers ⁇ brush is operated with too much ground clearance.
  • ⁇ cleaning width to an undesirable extent by the surface conditions, in particular depend on the surface roughness; For example, the greater friction causes a smaller sweeping mirror width than with asphalt surfaces due to the greater friction.
  • firmly adhering dirt such as clay and the like undesirably reduce the sweeping mirror width due to the strong braking torque exerted on the roller brush, which leads to an impairment of the cleaning result.
  • the timing of the readjustment movement is relatively imprecise because it only takes average wear conditions into account, but not the actual bristle wear that is dependent on the individual operating conditions.
  • the present invention aims to provide a sweeping unit of the generic type, in which the optimal sweeping mirror can be set precisely with the least effort, the sweeping unit also being able to be constructed in a robust, fault-resistant manner should honor.
  • this object is achieved in that the drive torque or the drive power of the roller brush or one hereby Coupled size-detecting sensor is provided, the signal of which is connected to the control unit, the control unit determining the working position of the adjusting member corresponding to the optimum sweeping mirror width as a function of the ground contact position of the adjusting member characterized by a sudden increase in the sensor signal when the roller brush is lowered.
  • the actual diameter of the roller brush which is dependent on the bristle wear, is automatically taken into account when adjusting its position relative to the surface to be cleaned, in that with the individual sweeping operation the ground contact of the roller brush and the corresponding ground contact - position of the adjusting member as a reference point for the optimal sweeping mirror width corresponding working position of the adjusting member is used.
  • the ground contact of the roller brush when it is lowered is determined by an abrupt increase in the sensor signal, which is emitted by a sensor that detects the drive torque or the drive power of the roller brush or a quantity coupled to it.
  • the sweeping mirror width set by the control device is not dependent on the surface conditions, in particular the roughness of the surface to be cleaned. A complicated, fault-prone sensor arrangement is also not required. Nevertheless, when setting the sweeping mirror width, an average degree of wear of the roller brush, which is dependent on the mileage of the roller brush in question, is not used, but rather rather the actual degree of wear. As a result, the present invention provides a sweeping unit in which the optimal sweeping level can be automatically set exactly with the least outlay on equipment, the sweeping unit also being distinguished by a robust, failure-resistant structure.
  • the present invention can already be used to advantage if the working position of the adjusting member is determined in the control unit from its ground contact position by adding a constant size.
  • the roller brush would be lowered in a sweeping operation to a position that is a certain amount (e.g. 2 mm) below the ground contact position. This would lead to a gradual reduction in the sweeping mirror width due to the geometrical conditions with increasing wear of the roller brush; however, this would - at least in part - be compensated for by an increasing hardness of the brush, so that the cleaning result would essentially not change.
  • a preferred development of the present invention is characterized in that the feed movement of the adjusting member, by which its working position differs from its ground contact position, is dependent on the actual diameter of the roller brush.
  • the control device comprises a corresponding compensation circuit, for example in the form of a characteristic curve, which indicates the infeed movement, ie the difference between the working position and the ground contact position of the adjusting member, as a function of the actual diameter of the roller brush.
  • the latter can be taken directly from the Derive the ground contact position of the adjusting member, since - with support wheels standing on the surface to be cleaned - each diameter of the roller brush corresponds exactly to one bottom contact position of the adjusting member.
  • Suitable measuring devices for determining the diameter of the roller brush which also evaluate the position of the roller brush relative to the support frame in the ground contact position of the roller brush, can be used in the same way.
  • the decisive factor is that the diameter of the roller brush is not measured directly via sensors, but rather is derived from the position of the roller brush when it comes into contact with the ground, and thus indirectly using the signal from the ground contact sensor.
  • a preferred development of the sweeping unit according to the invention is characterized in that the at least one adjusting member is designed as a hydraulic adjusting cylinder.
  • a feed cylinder is particularly preferably hydraulically connected to the adjustment cylinder, whose hydraulic work space communicating with the adjustment cylinder has a smaller cross-sectional area than the at least one adjustment cylinder.
  • the feed cylinder is used for volumetric metering of the hydraulic fluid to the at least one adjusting cylinder, which corresponds to the feed movement of the adjusting cylinder from its ground contact position to its working position.
  • a bypass line to the feed cylinder is particularly preferred, since the latter only for the exact lowering of the roller brush from its ground contact position is needed in their working position.
  • a mechanical adjusting drive acts on the piston of the feed cylinder, so that the feed cylinder itself takes over the function of a pump.
  • the feed cylinder is particularly preferably connected between a hydraulic pump and the at least one adjusting cylinder. In this case, it also runs, the volume of the hydraulic fluid supplied to the at least one adjusting cylinder being determined by the number of strokes of the feed cylinder and / or - in the case of incomplete strokes - the path of the piston of the feed cylinder.
  • the sweeping unit illustrated in the drawing comprises a roller brush 1 which is rotatably mounted about its axis 3 within a support frame 2 and is driven by a hydraulic motor 4.
  • the support frame 2 in turn comprises two hydraulic forming the adjusting members V.
  • Adjustment cylinders 5 and 6 the piston rod of each of the two hydraulic adjustment cylinders being connected to a support wheel 7 and 8, respectively.
  • the support wheels are mechanically coupled, which guarantees smooth movement even when the weight is not constant over the length of the roller.
  • the - only schematically illustrated - technical-constructive design is such that the vertical distance between the support wheels 7, 8 and the axis 3 of the roller brush 1 can be changed by means of the adjusting cylinders 5 and 6.
  • Such constructions are well known, so that a more detailed explanation can be omitted.
  • the sweeping unit itself is suspended from a carrier vehicle by means of a support arrangement (not shown).
  • the support arrangement allows the sweeping unit to be raised to a transport position and the sweeping unit to be lowered to a working position in which the support wheels 7 and 8 roll on the surface to be cleaned. This is also part of the state of the art and therefore requires no explanation at this point.
  • control unit 9 The function of the sweeping unit is controlled by a control unit 9. This is connected to the operating point 11 via a control line 10. If the sweeping unit is put into operation via a corresponding switch 12 at operating point 11, the following steps take place within the hydraulics controlled by control unit 9:
  • valves 13 and 14 are switched from their blocking position to their flow-through position, the control valve 15 is switched from its blocking position to its crossover position, in which there are the connections P and B on the one hand and A and T on the other hand, and the pump 16 is started.
  • the hydraulic working spaces 17, 18 of the adjusting cylinders 5 and 6 are filled with hydraulic fluid, and the piston rods of the adjusting cylinders are displaced into the sump 22 in via the valve 14 and the back pressure valve 21, displacing the hydraulic fluid present in the hydraulic working spaces 19 and 20 extended their maximum position.
  • valves 27 and 28 are switched to their flow position. In this way, hydraulic fluid passes through the pump 16 and the control valve 15, which is still in the crossover position, into the hydraulic working spaces 19 and 20 of the adjustment cylinders 5 and 6. Their piston rods retract slowly, the hydraulic fluid present in the hydraulic working spaces 17 and 18 being displaced into the sump 22 via the (opened) valve 28 and the back pressure valve 21. This leads to a gradual lowering of the sweeping roller 1 in the direction of the surface to be cleaned.
  • the hydraulic working space 25 of the feed cylinder 24 is acted upon, and the hydraulic fluid present in the hydraulic working space 23 is displaced via the (opened) valve 27 into the hydraulic working spaces 19 and 20 of the adjusting cylinders 5 and 6.
  • the predetermined volume of the hydraulic working space 23 of the feed cylinder 24 leads to a precisely defined shortening of the adjusting cylinders 5 and 6 and thus to a precisely defined lowering of the roller brush 1.
  • the number of strokes of the feed cylinder 24, which are required to bring the roller brush 1 from its ground contact position into its working position, depend in particular on the hydraulic reduction ratio between the feed cylinder 24 and the adjustment cylinders 5 and 6. The greater the reduction ratio, the more the position of the roller brush 1 can be adjusted more precisely relative to the surface to be cleaned.
  • the piston rod of the feed cylinder 24 acts on a counting device Z in the form of a pulse counter 31, which is connected to the control unit 9. If the number of strokes determined by the pulse counter 31 corresponds to the value specified by the control device 9, all valves 13, 14, 27 and 28 and the control valve 15 are closed and the hydraulic pump 16 is switched off.
  • the hydraulic pump 26 is switched off by means of a corresponding switch on the control panel 11 and the sweeping unit is raised via the support arrangement (not shown).
  • the above-described extension of the pistons of the adjusting cylinders 5 and 6 by acting on their hydraulic working spaces 17 and 18 can follow. This step can then be omitted at the start of the sweeping operation.

Abstract

A sweeping unit which can be affixed to a carrier vehicle or a trailer, comprising a supporting frame (2) and at least one motor-driven rotary brush (1) which is rotationally mounted around the longitudinal axis (3) thereof. The supporting frame (2) is provided with supporting wheels (7,8), whereby the vertical distance of said wheels from the axis (3) of the rotary brush (1) can be modified by means of an adjusting device comprising at least one adjusting member (V) and a control unit (9). A sensor (S) is provided for the detection of driving torque or the driving power of the rotary brush (1) or an associated variable, whereby the signal from said sensor is switched to the control unit (9). The control unit (9) determines the working position of the adjusting member (V) corresponding to an optimum contact surface between the brush and the ground as a function of the contact position between the ground and the adjusting member (V), characterized by a sharp increase in said sensor signal when the rotary brush (1) is lowered.

Description

Kehraggregat Sweeping unit
Die vorliegende Erfindung betrifft ein Kehraggregat zum Anbau an ein Trägerfahrzeug oder an einen Anhänger, umfassend einen Tragrahmen und mindestens eine darin um ihre Längsachse drehbar gelagerte, motorisch angetriebene Walzenburste, wobei der Tragrahmen Stützräder aufweist, deren vertikaler Abstand zu der Achse der Walzenbürste mittels einer Verstelleinheit veränderbar ist, welche mindestens ein Verstellorgan und ein Steuergerät umfaßt.The present invention relates to a sweeping unit for mounting on a carrier vehicle or on a trailer, comprising a support frame and at least one motor-driven roller brush rotatably mounted therein about its longitudinal axis, the support frame having support wheels, the vertical distance from the axis of the roller brush by means of an adjusting unit is changeable, which comprises at least one adjusting member and a control unit.
Kehraggregate der vorstehend angegebenen Art sind in verschiedenen Ausführungen bekannt, beispielsweise aus der europäischen Patentschrift 0372258 und der deutschen Offenlegungsschrift 3740215. Bekannt sind des weiteren Kehraggregate, die im wesentlichen einen gattungsgemäßen Aufbau aufweisen, sich von diesem jedoch dadurch unterscheiden, daß das Verstellorgan nicht über ein Steuergerät eingestellt wird, sondern vielmehr Teil eines hydraulischen Regelkreises ist und daß darüber hinaus der Tragrahmen nicht über Stützräder verfügt; derartige Kehraggregate sind beispielsweise den deutschen Offen- legungsschriften 2455200 und 2821627 sowie den europäischen Patentanmeldungen 0189371 und 0843047 entnehmbar.Sweeping units of the type specified above are known in various versions, for example from European Patent 0372258 and German Offenlegungsschrift 3740215. Also known are further sweeping units which essentially have a generic structure, but differ from this in that the adjusting member does not have a Control unit is set, but rather is part of a hydraulic control circuit and that in addition the support frame does not have support wheels; Sweeping units of this type can be found, for example, in German patent applications 2455200 and 2821627 and in European patent applications 0189371 and 0843047.
Für sämtliche der aus den vorstehend angegebenen Publikationen bekannten Kehraggregate ist die korrekte Einstellung der Kehrspiegelbreite von ausschlaggebender Bedeutung für einen effizienten und zugleich materialschonenden Kehrbetrieb. So, wie dies in der europäischen Patentschrift 0372258 im Detail erläutert ist, ist die optimale Kehrspiegelbreite gekennzeichnet durch ein gutes Reinigungsergebnis bei geringem Borstenverschleiß. Liegt die Kehrspiegelbreite unterhalb des optimalen Werts, läßt die Reinigungsleistung spürbar nach. Bei einer Kehrspiegelbreite oberhalb des optimalen Werts nimmt hingegen der Borstenverschleiß ohne nennenswerte Verbesserung des Reinigungsergebnisses spürbar zu.For all of the sweeping units known from the above-mentioned publications, the correct setting of the sweeping mirror width is of crucial importance for an efficient and material-saving sweeping operation. As explained in detail in the European patent specification 0372258, the optimal sweeping mirror width is characterized by a good cleaning result with little bristle wear. Lies the sweeping mirror width below the optimal value noticeably reduces the cleaning performance. With a sweeping mirror width above the optimal value, however, the bristle wear increases noticeably without any noticeable improvement in the cleaning result.
Um in dem vorstehend dargelegten Sinne die Kehrspiegel - breite auf ihren optimalen Wert einzustellen, ist es unter anderem erforderlich, die Walzenbürste entsprechend dem Borstenverschleiß nachzuführen, d.h. den Abstand der Achse der Walzenbürste zur zu reinigenden Oberfläche entsprechend dem Borstenverschleiß nach und nach zu verringern. Hierzu wird in den deutschen Offenlegungs- schriften 2455200 und 2821627 sowie der europäischen Patentanmeldung 0843047 vorgeschlagen, daß das Steuergerät der Verstelleinheit dergestalt auf das Verstellorgan einwirkt, daß das Antriebsmoment für die Walzenbürste stets konstant ist. Gemäß der deutschen Offen- legungsschrift 3740215 sowie der europäischen Patentschrift 0372258 wird demgegenüber mittels Sensoren der (vom Borstenverschleiß abhängige) aktuelle Durchmesser der Walzenbürste gemessen und in Abhängigkeit von diesem Meßwert der optimale Abstand der Achse der Walzenbürste zur zu reinigenden Oberfläche ermittelt und eingestellt. Schließlich ist eine Zeitsteuerung bekannt, bei der die von einem Betriebsstundenzähler ermittelte Laufleistung der jeweiligen Walzenbürste als Indikator für deren Abnutzung und somit als Maß für die erforderliche Nchstellung ausgewertet wird. Sämtliche Methoden sind dabei nicht frei von Nachteilen. Die Erfassung des aktuellen Durchmessers der Walzenbürste mittels Sensoren erfordert eine komplizierte Meßaufnehmeranordnung, die den Einsätzen im harten Winterdienst nicht dauerhaft standhält. Darüberhinaus kann der Tastkörper bei ungünstigen Witterungsbedingungen vereisen und meldet infolgedessen einen größeren als den tatsächlichen Durchmesser der Walzenbürste. Die Folge hiervon ist ein unbefriedigendes Reinigungsergebnis, weil die Walzen¬ bürste mit einem zu großen Bodenabstand betrieben wird. Gravierendster Nachteil der auf einem konstanten Antriebsmoment beruhenden Methoden ist, daß die einge¬ stellte Kehrspiegelbreite in unerwünschtem Ausmaß von den Oberflächenverhältnissen, insbesondere der Oberflächenrauhigkeit abhängt; so stellt sich beispielsweise bei Oberflächen aus Beton aufgrund der größeren Reibung eine geringere Kehrspiegelbreite ein als bei Oberflächen aus Asphalt. In entsprechender Weise reduzieren fest haftende Verschmutzungen wie Lehm und dergleichen aufgrund des starken auf die Walzenbürste ausgeübten Bremsmoments in unerwünschter Weise die Kehrspiegelbreite, was zu einer Beeinträchtigung des Reinigungsergebnisses führt. Die Zeitsteuerung der Nachstellbewegung ist, da sie nur mittlere Verschleißverhältnisse, nicht jedoch den tatsächlichen, von den individuellen Einsatzbedingungen abhängigen Borstenverschleiß berücksichtigt, relativ ungenau .In order to adjust the sweeping mirror width to its optimum value in the sense set out above, it is necessary, among other things, to adjust the roller brush in accordance with the bristle wear, ie to gradually reduce the distance between the axis of the roller brush and the surface to be cleaned in accordance with the bristle wear. For this purpose, it is proposed in German Offenlegungsschriften 2455200 and 2821627 and in European patent application 0843047 that the control unit of the adjusting unit acts on the adjusting member in such a way that the drive torque for the roller brush is always constant. In contrast, according to German published patent application 3740215 and European patent specification 0372258, sensors are used to measure the current diameter of the roller brush (depending on the bristle wear) and, depending on this measured value, the optimum distance between the axis of the roller brush and the surface to be cleaned is determined and set. Finally, a time control is known in which the mileage of the respective roller brush determined by an operating hours counter is evaluated as an indicator of its wear and thus as a measure of the required readjustment. All methods are not free from disadvantages. The detection of the current diameter of the roller brush by means of sensors requires a complicated sensor arrangement that cannot withstand the use in tough winter service. In addition, the probe body can unfavorable weather conditions icing up and consequently reports a larger than the actual diameter of the roller brush. The consequence of this is an unsatisfactory cleaning results because the rollers ¬ brush is operated with too much ground clearance. Is most serious disadvantage of based on a constant drive torque Methods that is presented ¬ cleaning width to an undesirable extent by the surface conditions, in particular depend on the surface roughness; For example, the greater friction causes a smaller sweeping mirror width than with asphalt surfaces due to the greater friction. In a corresponding manner, firmly adhering dirt such as clay and the like undesirably reduce the sweeping mirror width due to the strong braking torque exerted on the roller brush, which leads to an impairment of the cleaning result. The timing of the readjustment movement is relatively imprecise because it only takes average wear conditions into account, but not the actual bristle wear that is dependent on the individual operating conditions.
Vor dem Hintergrund der vorstehend dargelegten Nachteile des Standes der Technik zielt die vorliegende Erfindung darauf ab, ein Kehraggregat der gattungsgemäßen Art zu schaffen, bei welchem sich der optimale Kehrspiegel mit geringstem Aufwand exakt einstellen läßt, wobei sich das Kehraggregat darüberhinaus durch einen robusten, störungsunanfälligen Aufbau auszeichnen soll.Against the background of the disadvantages of the prior art set out above, the present invention aims to provide a sweeping unit of the generic type, in which the optimal sweeping mirror can be set precisely with the least effort, the sweeping unit also being able to be constructed in a robust, fault-resistant manner should honor.
Gemäß der vorliegenden Erfindung wird diese Aufgabe dadurch gelöst, daß ein das Antriebsmoment oder die Antriebsleistung der Walzenbürste oder eine hiermit gekoppelte Größe erfassender Sensor vorgesehen ist, dessen Signal auf das Steuergerät geschaltet ist, wobei das Steuergerät die der optimalen Kehrspiegelbreite entsprechende Arbeitsstellung des Verstellorgans als Funktion der beim Absenken der Walzenbürste durch einen sprunghaften Anstieg des Sensorsignals gekennzeichneten Bodenkontaktstellung des Verstellorgans ermittelt.According to the present invention, this object is achieved in that the drive torque or the drive power of the roller brush or one hereby Coupled size-detecting sensor is provided, the signal of which is connected to the control unit, the control unit determining the working position of the adjusting member corresponding to the optimum sweeping mirror width as a function of the ground contact position of the adjusting member characterized by a sudden increase in the sensor signal when the roller brush is lowered.
Bei dem erfindungsgemäßen Kehraggregat wird somit der vom Borstenverschleiß abhängige tatsächliche Durchmesser der Walzenbürste beim Einstellen von deren Lage relativ zur zu reinigenden Oberfläche automatisch berücksichtigt, indem bei dem einzelnen Kehreinsatz der Bodenkontakt der Walzenbürste und die diesen entsprechende Bodenkontakt - Stellung des Verstellorgans als Bezugspunkt für die der optimalen Kehrspiegelbreite entsprechende Arbeitsstellung des Verstellorgans herangezogen wird. Der Bodenkontakt der Walzenbürste bei ihrem Absenken wird dabei durch einen sprunghaften Anstieg des Sensorsignals ermittelt, das von einem Sensor abgegeben wird, der das Antriebsmoment oder die Antriebsleistung der Walzenbürste oder eine hiermit gekoppelte Größe erfaßt .In the sweeping unit according to the invention, the actual diameter of the roller brush, which is dependent on the bristle wear, is automatically taken into account when adjusting its position relative to the surface to be cleaned, in that with the individual sweeping operation the ground contact of the roller brush and the corresponding ground contact - position of the adjusting member as a reference point for the optimal sweeping mirror width corresponding working position of the adjusting member is used. The ground contact of the roller brush when it is lowered is determined by an abrupt increase in the sensor signal, which is emitted by a sensor that detects the drive torque or the drive power of the roller brush or a quantity coupled to it.
Probleme der vorstehend im Zusammenhang mit dem Stand der Technik dargelegten Art treten bei einem Kehraggregat gemäß der vorliegenden Erfindung nicht auf. Weder ist die von dem Steuergerät eingestellte Kehrspiegelbreite abhängig von den Oberflächenverhältnissen, insbesondere der Rauhigkeit der zu reinigenden Oberfläche. Ebensowenig ist eine komplizierte, störanfällige Meßaufnehmeranordnung erforderlich. Trotzdem wird bei der Einstellung der Kehrspiegelbreite nicht ein von der Laufleistung der betreffenden Walzenbürste abhängiger mittlerer Abnutzungsgrad der Walzenbürste zugrundegelegt, sondern vielmehr der tatsächliche Verschleißgrad. Infolgedessen stellt die vorliegende Erfindung ein Kehraggregat bereit, bei welchem sich der optimale Kehrspiegel mit geringstem apparativem Aufwand automatisch exakt einstellen läßt, wobei sich das Kehraggregat darüber hinaus durch einen robusten, störungsunanfälligen Aufbau auszeichnet.Problems of the type set forth above in connection with the prior art do not occur in a sweeping unit according to the present invention. The sweeping mirror width set by the control device is not dependent on the surface conditions, in particular the roughness of the surface to be cleaned. A complicated, fault-prone sensor arrangement is also not required. Nevertheless, when setting the sweeping mirror width, an average degree of wear of the roller brush, which is dependent on the mileage of the roller brush in question, is not used, but rather rather the actual degree of wear. As a result, the present invention provides a sweeping unit in which the optimal sweeping level can be automatically set exactly with the least outlay on equipment, the sweeping unit also being distinguished by a robust, failure-resistant structure.
Die vorliegende Erfindung läßt sich bereits mit Vorteil einsetzen, wenn im Steuergerät die Arbeitsstellung des Verstellorgans aus dessen Bodenkontaktstellung durch Addition einer konstanten Größe ermittelt wird. In diesem Falle würde mit anderen Worten die Walzenbürste im Kehrbetrieb jeweils in eine Stellung abgesenkt werden, die um ein bestimmtes Maß (z.B. 2 mm) unterhalb der Bodenkontaktstellung lieg . Dies würde zwar infolge der geometrischen Verhältnisse bei fortschreitender Abnützung der Walzenbürste zu einer allmählichen Reduktion der Kehrspiegelbreite führen; diese würde jedoch - zumindest teilweise - durch eine zunehmende Härte der Bürste kompensiert, so daß das Reinigungsergebnis sich im wesentlichen nicht ändern würde.The present invention can already be used to advantage if the working position of the adjusting member is determined in the control unit from its ground contact position by adding a constant size. In this case, in other words, the roller brush would be lowered in a sweeping operation to a position that is a certain amount (e.g. 2 mm) below the ground contact position. This would lead to a gradual reduction in the sweeping mirror width due to the geometrical conditions with increasing wear of the roller brush; however, this would - at least in part - be compensated for by an increasing hardness of the brush, so that the cleaning result would essentially not change.
Eine bevorzugte Weiterbildung der vorliegenden Erfindung zeichnet sich demgegenüber allerdings dadurch aus, daß die Zustellbewegung des Verstellorgans, durch die sich dessen Arbeitsstellung von dessen Bodenkontaktstellung unterscheidet, von dem tatsächlichen Durchmesser der Walzenbürste abhängig ist. In diesem Falle umfaßt das Steuergerät eine entsprechende Kompensationsschaltung, beispielsweise in Form einer Kennkurve, die die Zustellbewegung, d.h. die Differenz zwischen Arbeitsstellung und Bodenkontaktstellung des Verstellorgans, in Abhängigkeit von dem tatsächlichen Durchmesser der Walzenbürste angibt. Letzterer läßt sich dabei unmittelbar aus der Bodenkontaktstellung des Verstellorgans ableiten, da - bei auf der zu reinigenden Oberfläche aufstehenden Stützrädern - jedem Durchmesser der Walzenbürste genau eine Bodenkontaktstellung des Verstellorgans entspricht. Andere geeignete Meßeinrichtungen zur Ermittlung des Durchmessers der Walzenbürste, die ebenfalls die Stellung der Walzenbürste relativ zum Tragrahmen in der Bodenkontaktstellung der Walzenbürste auswerten, können in gleicher Weise eingesetzt werden. Hierzu zählt insbesondere ein Winkelmesser, der die Winkelstellung mindestens eines Tragarmes der Walzenbürste relativ zu- einer weiteren Komponente des Tragrahmens ermittelt . Maßgeblich ist, daß jeweis der Durchmesser der Walzenbürste nicht - über Sensoren - direkt gemessen, sondern vielmehr aus der Stellung der Walzenbürste im Moment ihres Bodenkontakts, und somit mittelbar unter Nutzung des Signals des Bodenkontaktsensors abgeleitet wird.A preferred development of the present invention, however, is characterized in that the feed movement of the adjusting member, by which its working position differs from its ground contact position, is dependent on the actual diameter of the roller brush. In this case, the control device comprises a corresponding compensation circuit, for example in the form of a characteristic curve, which indicates the infeed movement, ie the difference between the working position and the ground contact position of the adjusting member, as a function of the actual diameter of the roller brush. The latter can be taken directly from the Derive the ground contact position of the adjusting member, since - with support wheels standing on the surface to be cleaned - each diameter of the roller brush corresponds exactly to one bottom contact position of the adjusting member. Other suitable measuring devices for determining the diameter of the roller brush, which also evaluate the position of the roller brush relative to the support frame in the ground contact position of the roller brush, can be used in the same way. This includes, in particular, a protractor, which determines the angular position of at least one support arm of the roller brush relative to another component of the support frame. The decisive factor is that the diameter of the roller brush is not measured directly via sensors, but rather is derived from the position of the roller brush when it comes into contact with the ground, and thus indirectly using the signal from the ground contact sensor.
Eine bevorzugte Weiterbildung des erfindungsgemäßen Kehraggregats zeichnet sich dadurch aus, daß das mindestens eine Verstellorgan als hydraulischer Verstell- zylinder ausgeführt ist. In diesem Falle ist mit dem Verstellzylinder besonders bevorzugt ein Speisezylinder hydraulisch verbunden, dessen mit dem Verstellzylinder kommunizierender hydraulischer Arbeitsraum eine geringere Querschnittsfläche aufweist als der mindestens eine Verstellzylinder. Der Speisezylinder dient dabei der volumetrischen Zumessung der Hydraulikflüssigkeit zu dem mindestens einen Verstellzylinder, die der Zustellbewegung des Verstellzylinders von seiner Bodenkontaktstellung in seine Arbeitsstellung entspricht. Besonders bevorzugt besteht dabei eine Umgehungsleitung zu dem Speisezylinder, da letzterer lediglich für die exakte Absenkung der Walzenbürste aus ihrer Bodenkontaktstellung in ihre Arbeitsstellung benötigt wird. Weder beim Absenken der Walzenbürste in ihre Bodenkontaktstellung noch beim Anheben der Walzenbürste bedarf es einer volumetrischen Bestimmung des dem mindestens einen Verstellzylinder zugeführten bzw. aus diesem abströmenden Volumens an Hydraulikflüssigkeit. Die vorstehend erläuterte Ausgestaltung der Hydraulikanlage mit einem Speisezylinder resultiert in einer besonders exakten Einstellmöglichkeit für den mindestens einen Verstellzylinder .A preferred development of the sweeping unit according to the invention is characterized in that the at least one adjusting member is designed as a hydraulic adjusting cylinder. In this case, a feed cylinder is particularly preferably hydraulically connected to the adjustment cylinder, whose hydraulic work space communicating with the adjustment cylinder has a smaller cross-sectional area than the at least one adjustment cylinder. The feed cylinder is used for volumetric metering of the hydraulic fluid to the at least one adjusting cylinder, which corresponds to the feed movement of the adjusting cylinder from its ground contact position to its working position. A bypass line to the feed cylinder is particularly preferred, since the latter only for the exact lowering of the roller brush from its ground contact position is needed in their working position. Neither when the roller brush is lowered into its ground contact position nor when the roller brush is raised does a volumetric determination of the volume of hydraulic fluid supplied to or flowing out of the at least one adjusting cylinder be required. The above-described configuration of the hydraulic system with a feed cylinder results in a particularly exact setting option for the at least one adjustment cylinder.
Zwar ist im Rahmen der vorstehend erläuterten Weiterbildung der vorliegenden Erfindung denkbar, daß auf den Kolben des Speisezylinders ein mechanischer Versteilantrieb wirkt, so daß der Speisezylinder selbst die Funktion einer Pumpe übernimmt. Besonders bevorzugt ist jedoch der Speisezylinder zwischen einer Hydraulikpumpe und dem mindestens einen Verstellzylinder geschaltet. Er läuft in diesem Falle mit, wobei das Volumen der dem mindestens einen Verstellzylinder zugeführten Hydraulikflüssigkeit durch die Anzahl der Hübe des Speisezylinders und/oder - bei nicht vollständigen Hüben - den Weg des Kolbens des Speisezylinders ermittelt wird.It is indeed conceivable within the framework of the development of the present invention explained above that a mechanical adjusting drive acts on the piston of the feed cylinder, so that the feed cylinder itself takes over the function of a pump. However, the feed cylinder is particularly preferably connected between a hydraulic pump and the at least one adjusting cylinder. In this case, it also runs, the volume of the hydraulic fluid supplied to the at least one adjusting cylinder being determined by the number of strokes of the feed cylinder and / or - in the case of incomplete strokes - the path of the piston of the feed cylinder.
Im Folgenden wird die vorliegende Erfindung anhand der Zeichnung näher erläutert. Diese zeigt das Hydraulikschema einer bevorzugten Ausführungsform des erfindungsgemäßen Kehraggregats .The present invention is explained in more detail below with reference to the drawing. This shows the hydraulic diagram of a preferred embodiment of the sweeping unit according to the invention.
Das in der Zeichnung veranschaulichte Kehraggregat umfaßt eine Walzenbürste 1, die innerhalb eines Tragrahmens 2 um ihre Achse 3 drehbar gelagert und von einem Hydraulikmotor 4 angetrieben ist . Der Tragrahmen 2 umfaßt seinerseits zwei die Verstellorgane V bildende hydraulische Verstellzylinder 5 und 6, wobei die Kolbenstange jedes der beiden hydraulischen Verstellzylinder mit jeweils einem Stützrad 7 bzw. 8 verbunden ist. Die Stützräder sind mechanisch gekoppelt, was eine gleichmäßige Bewegung auch bei nicht konstantem Gewicht über Walzenlänge garantiert. Die - nur schematisch veranschaulichte - technisch-konstruktive Gestaltung ist dabei dergestalt, daß mittels der Verstellzylinder 5 und 6 der vertikale Abstand zwischen den Stützrädern 7, 8 und der Achse 3 der Walzenbürste 1 veränderbar ist . Dergleichen Konstruktionen sind hinlänglich bekannt, so- daß auf eine nähere Erläuterung verzichtet werden kann.The sweeping unit illustrated in the drawing comprises a roller brush 1 which is rotatably mounted about its axis 3 within a support frame 2 and is driven by a hydraulic motor 4. The support frame 2 in turn comprises two hydraulic forming the adjusting members V. Adjustment cylinders 5 and 6, the piston rod of each of the two hydraulic adjustment cylinders being connected to a support wheel 7 and 8, respectively. The support wheels are mechanically coupled, which guarantees smooth movement even when the weight is not constant over the length of the roller. The - only schematically illustrated - technical-constructive design is such that the vertical distance between the support wheels 7, 8 and the axis 3 of the roller brush 1 can be changed by means of the adjusting cylinders 5 and 6. Such constructions are well known, so that a more detailed explanation can be omitted.
Das Kehraggregat selbst ist mittels einer - nicht dargestellten - Traganordnung an einem Trägerfahrzeug aufgehängt . Die Traganordnung gestattet dabei das Anheben des Kehraggregats in eine Transportstellung und Absenken des Kehraggregats in eine Arbeitsstellung, in der die Stützräder 7 und 8 auf der zu reinigenden Oberfläche abrollen. Auch dies zählt zum Stand der Technik und bedarf daher an dieser Stelle keiner Erläuterung.The sweeping unit itself is suspended from a carrier vehicle by means of a support arrangement (not shown). The support arrangement allows the sweeping unit to be raised to a transport position and the sweeping unit to be lowered to a working position in which the support wheels 7 and 8 roll on the surface to be cleaned. This is also part of the state of the art and therefore requires no explanation at this point.
Die Funktion des Kehraggregates wird durch ein Steuergerät 9 gesteuert. Dieses steht über eine Steuerleitung 10 mit dem Bedienpunkt 11 in Verbindung. Wird über einen entsprechenden Schalter 12 am Bedienpunkt 11 das Kehraggregat in Betrieb genommen, so laufen innerhalb der von dem Steuergerät 9 gesteuerten Hydraulik die folgenden Schritte ab:The function of the sweeping unit is controlled by a control unit 9. This is connected to the operating point 11 via a control line 10. If the sweeping unit is put into operation via a corresponding switch 12 at operating point 11, the following steps take place within the hydraulics controlled by control unit 9:
Die Ventile 13 und 14 werden aus ihrer Sperrstellung in ihre Durchflußstellung geschaltet, das Steuerventil 15 wird aus seiner Sperrstellung in seine Überkreuzstellung geschaltet, in der es die Anschlüsse P und B einerseits und A und T andererseits miteinander verbindet, und die Pumpe 16 wird in Betrieb genommen. Auf diese Weise werden die hydraulischen Arbeitsräume 17, 18 der Verstellzylinder 5 und 6 mit Hydraulikflüssigkeit gefüllt, und die Kolbenstangen der Verstellzylinder werden unter Verdrängung der in den hydraulischen Arbeitsräumen 19 und 20 vorhandenen Hydraulikflüssigkeit über das Ventil 14 und das Gegendruckventil 21 in den Sumpf 22 in ihre maximale Stellung ausgefahren. (Eine umgekehrte Anordnung der Verstellzylinder, bei der die Walzenbürste durch Füllen der Stangenseiten der Verstellzylinder angehoben wird, ist in gleicher Weise möglich.) Zugleich wird der hydraulische Arbeitsraum 23 des Speisezylinders 24 gefüllt, wodurch der Kolben des Speisezylinders unter Verdrängung der in dem hydraulischen Arbeitsraum 25 vorhandenen Hydraulikflüssigkeit über das Steuerventil 15 in den Sumpf 22 in seine linke Endstellung gebracht wird. Anschließend werden die Ventile 13 und 14 in ihre Sperrstellung gebracht, und das Kehraggregat wird mittels der - nicht dargestellten - Tragvorrichtung so weit abgesenkt, bis die Stützräder 7 und 8 auf der zu reinigenden Oberfläche aufstehen. Die Tragvorrichtung wird anschließend in ihre Schwimmstellung geschaltet, damit das Kehraggregat Bodenunebenheiten folgen kann.The valves 13 and 14 are switched from their blocking position to their flow-through position, the control valve 15 is switched from its blocking position to its crossover position, in which there are the connections P and B on the one hand and A and T on the other hand, and the pump 16 is started. In this way, the hydraulic working spaces 17, 18 of the adjusting cylinders 5 and 6 are filled with hydraulic fluid, and the piston rods of the adjusting cylinders are displaced into the sump 22 in via the valve 14 and the back pressure valve 21, displacing the hydraulic fluid present in the hydraulic working spaces 19 and 20 extended their maximum position. (A reverse arrangement of the adjusting cylinders, in which the roller brush is raised by filling the rod sides of the adjusting cylinders, is possible in the same way.) At the same time, the hydraulic working space 23 of the feed cylinder 24 is filled, whereby the piston of the feed cylinder is displaced in the hydraulic working space 25 existing hydraulic fluid is brought into its left end position via the control valve 15 in the sump 22. The valves 13 and 14 are then brought into their blocking position, and the sweeping unit is lowered by means of the carrying device (not shown) until the support wheels 7 and 8 stand on the surface to be cleaned. The carrying device is then switched to its floating position so that the sweeping unit can follow uneven floors.
Nun wird die den Hydraulikmotor 4 antreibende Hydraulikpumpe 26 eingeschaltet, so daß die Walzenbürste 1 in Drehung versetzt wird.Now the hydraulic pump 26 driving the hydraulic motor 4 is switched on, so that the roller brush 1 is set in rotation.
Des weiteren werden die Ventile 27 und 28 in ihre Durchflußstellung geschaltet. Auf diese Weise gelangt Hydraulikflüssigkeit über die Pumpe 16 und das nach wie vor in Überkreuzstellung geschaltete Steuerventil 15 in die hydraulischen Arbeitsräume 19 und 20 der Verstell- zylinder 5 und 6. Deren Kolbenstangen fahren langsam ein, wobei die in den hydraulischen Arbeitsräumen 17 und 18 vorhandene Hydraulikflüssigkeit über das (geöffenete) Ventil 28 und das Gegendruckventil 21 in den Sumpf 22 verdrängt wird. Dies führt zu einem allmählichen Absenken der Kehrwalze 1 in Richtung auf die zu reinigende Oberfläche .Furthermore, the valves 27 and 28 are switched to their flow position. In this way, hydraulic fluid passes through the pump 16 and the control valve 15, which is still in the crossover position, into the hydraulic working spaces 19 and 20 of the adjustment cylinders 5 and 6. Their piston rods retract slowly, the hydraulic fluid present in the hydraulic working spaces 17 and 18 being displaced into the sump 22 via the (opened) valve 28 and the back pressure valve 21. This leads to a gradual lowering of the sweeping roller 1 in the direction of the surface to be cleaned.
Sobald die Walzenbürste 1 im Rahmen dieser Absenkbewegung die zu reinigende Oberfläche berührt und auf diese Weise über das Leerlauf-Bremsmoment hinaus gebremst wird, steigt der Druck in der die Hydraulikpumpe 26 und den Hydraulikmotor 4 miteinander verbindenden Druckleitung 29 sprunghaft an. Dieser Druckanstieg wird von dem Sensor S in Form eines Druckfühlers 30 registriert, der ein entsprechendes Signal auf das Steuergerät 9 schaltet. Das Steuergerät schaltet daraufhin das Steuerventil 15 aus seiner Überkreuzstellung in seine Parallel-Durchgangs- stellung, in der es die Anschlüsse A und P einerseits und B und T andererseits miteinander verbindet . Hierdurch wird der hydraulische Arbeitsraum 25 des Speisezylinders 24 beaufschlagt, und die in dem hydraulischen Arbeitsraum 23 vorhandene Hydraulikflüssigkeit wird über das (geöffnete) Ventil 27 in die hydraulischen Arbeitsräume 19 und 20 der Verstellzylinder 5 und 6 verdrängt. Das vorgegebene Volumen des hydraulischen Arbeitsraums 23 des Speisezylinders 24 führt zu einer exakt definierten Verkürzung der Verstellzylinder 5 und 6 und somit zu einem exakt definierten Absenken der Walzenbürste 1.As soon as the roller brush 1 touches the surface to be cleaned in the course of this lowering movement and is braked in this way beyond the idling braking torque, the pressure in the pressure line 29 connecting the hydraulic pump 26 and the hydraulic motor 4 to one another increases suddenly. This increase in pressure is registered by the sensor S in the form of a pressure sensor 30, which switches a corresponding signal to the control unit 9. The control device then switches the control valve 15 from its crossover position into its parallel passage position, in which it connects the connections A and P on the one hand and B and T on the other hand. As a result, the hydraulic working space 25 of the feed cylinder 24 is acted upon, and the hydraulic fluid present in the hydraulic working space 23 is displaced via the (opened) valve 27 into the hydraulic working spaces 19 and 20 of the adjusting cylinders 5 and 6. The predetermined volume of the hydraulic working space 23 of the feed cylinder 24 leads to a precisely defined shortening of the adjusting cylinders 5 and 6 and thus to a precisely defined lowering of the roller brush 1.
Ist die optimale Kehrspiegelbreite noch nicht erreicht, werden die beiden Ventile 27 und 28 geschlossen und das Steuerventil 15 in seine Überkreuzstellung gebracht. Hierdurch wird der hydraulische Arbeitsraum 23 des Speisezylinders 24 erneut mit Hydraulikflüssigkeit gefüllt und der oben beschriebene Vorgang - Öffnen der Ventile 27 und 28 sowie Umstellen des Steuerventils 15 in seine Parallel-Durchgangsstellung - kann wiederholt werden.If the optimum sweeping mirror width has not yet been reached, the two valves 27 and 28 are closed and the control valve 15 is brought into its crossover position. As a result, the hydraulic working space 23 of the Feed cylinder 24 again filled with hydraulic fluid and the process described above - opening valves 27 and 28 and switching control valve 15 into its parallel passage position - can be repeated.
Die Anzahl der Hübe des Speisezylinders 24, die dazu erforderlich sind, die Walzenbürste 1 aus ihrer Bodenkontaktstellung in ihre Arbeitsstellung zu bringen, richten sich insbesondere nach dem hydraulischen Untersetzungsverhältnis zwischen dem Speisezylinder 24 und den Verstellzylindern 5 und 6. Je größer das Untersetzungsverhältnis ist, desto exakter läßt sich die Position der Walzenbürste 1 relativ zur zu reinigenden Oberfläche einstellen. Die Kolbenstange des Speisezylinders 24 wirkt auf eine Zähleinrichtung Z in Form eines Impulszählers 31, der mit dem Steuergerät 9 in Verbindung steht. Entspricht die von dem Impulszähler 31 ermittelte Anzahl von Hüben dem von dem Steuergerät 9 vorgegebenen Wert, werden sämtliche Ventile 13, 14, 27 und 28 sowie das Steuerventil 15 geschlossen und die Hydraulikpumpe 16 abgeschaltet .The number of strokes of the feed cylinder 24, which are required to bring the roller brush 1 from its ground contact position into its working position, depend in particular on the hydraulic reduction ratio between the feed cylinder 24 and the adjustment cylinders 5 and 6. The greater the reduction ratio, the more the position of the roller brush 1 can be adjusted more precisely relative to the surface to be cleaned. The piston rod of the feed cylinder 24 acts on a counting device Z in the form of a pulse counter 31, which is connected to the control unit 9. If the number of strokes determined by the pulse counter 31 corresponds to the value specified by the control device 9, all valves 13, 14, 27 and 28 and the control valve 15 are closed and the hydraulic pump 16 is switched off.
Am Ende des Kehreinsatzes wird über einen entsprechenden Schalter am Bedienpult 11 die Hydraulikpumpe 26 abgeschaltet und das Kehraggregat über die - nicht dargestellte - Traganordnung angehoben. Das oben erläuterte Ausfahren der Kolben der Verstellzylinder 5 und 6 durch Beaufschlagen von deren hydraulischen Arbeitsräumen 17 und 18 kann sich anschließen. Dieser Schritt kann dann zu Beginn des Kehreinsatzes wegfallen. At the end of the sweeping operation, the hydraulic pump 26 is switched off by means of a corresponding switch on the control panel 11 and the sweeping unit is raised via the support arrangement (not shown). The above-described extension of the pistons of the adjusting cylinders 5 and 6 by acting on their hydraulic working spaces 17 and 18 can follow. This step can then be omitted at the start of the sweeping operation.

Claims

Ansprüche Expectations
1. Kehraggregat zum Anbau an ein Trägerfahrzeug oder einen Anhänger, umfassend einen Tragrahmen (2) und mindestens eine darin um ihre Längsachse (3) drehbar gelagerte, motorisch angetriebene Walzenbürste 1) , wobei der Tragrahmen (2) Stützräder (7, 8) aufweist, deren vertikaler Abstand zu der Achse (3) der Walzenbürste (1) mittels einer Verstelleinheit veränderbar ist, welche mindestens ein Verstellorgan (V) und ein Steuergerät (9) umfaßt, dadurch gekennzeichnet, daß ein das Antriebsmoment oder die Antriebsleistung der Walzenbürste (1) oder eine hiermit gekoppelte Größe erfassender Sensor (S) vorgesehen ist, dessen Signal auf das Steuergerät (9) geschaltet ist, wobei das Steuergerät (9) die der optimalen Kehrspiegelbreite entsprechende Arbeitsstellung des Verstellorgans (V) als Funktion der beim Absenken der Walzenbürste (1) durch einen sprunghaften Anstieg des Sensorsignals gekennzeichneten Bodenkontaktstellung des Verstellorgans (V) ermittelt.1. Sweeping unit for attachment to a carrier vehicle or a trailer, comprising a support frame (2) and at least one motor-driven roller brush 1) rotatably mounted therein about its longitudinal axis (3), the support frame (2) having support wheels (7, 8) , whose vertical distance from the axis (3) of the roller brush (1) can be changed by means of an adjusting unit which comprises at least one adjusting element (V) and a control device (9), characterized in that the drive torque or the driving power of the roller brush (1 ) or a sensor (S) which detects a size and is coupled to it, the signal of which is connected to the control unit (9), the control unit (9) determining the working position of the adjusting element (V) corresponding to the optimal sweeping mirror width as a function of 1) determined by a sudden rise in the sensor signal ground contact position of the adjusting member (V).
2. Kehraggregat nach Anspruch 1, dadurch gekennzeichnet, daß eine Meßanordnung zur Ermittlung des Durchmessers der Walzenbürste (1) vorgesehen ist, wobei das Durchmessersignal dem Steuergerät (9) zugeführt wird.2. Sweeping unit according to claim 1, characterized in that a measuring arrangement for determining the diameter of the roller brush (1) is provided, wherein the diameter signal is supplied to the control unit (9).
3. Kehraggregat nach Anspruch 1 oder Anspruch 2 , dadurch gekennzeichnet, daß das mindestens eine Verstellorgan (V) als hydraulischer Verstellzylinder (5, 6) ausgeführt ist. 3. Sweeping unit according to claim 1 or claim 2, characterized in that the at least one adjusting member (V) is designed as a hydraulic adjusting cylinder (5, 6).
4. Kehraggregat nach Anspruch 3 , dadurch gekennzeichnet, daß mit dem mindestens einen Verstellzylinder (5, 6) ein Speisezylinder (24) hydraulisch verbindbar ist, dessen mit den Verstellzylindern verbindbarer hydraulischer Arbeitsraum (23) eine geringere Querschnittsfläche aufweist als der mindestens eine Verstellzylinder (5, 6) .4. Sweeping unit according to claim 3, characterized in that with the at least one adjusting cylinder (5, 6) a feed cylinder (24) can be hydraulically connected, the hydraulic working space (23) which can be connected to the adjusting cylinders has a smaller cross-sectional area than the at least one adjusting cylinder ( 5, 6).
5. Kehraggregat nach Anspruch 4 , dadurch gekennzeichnet, daß der Speisezylinder (24) zwischen eine Hydraulikpumpe (16) und den mindestens einen Verstellzylinder (5, 6) geschaltet ist.5. Sweeping unit according to claim 4, characterized in that the feed cylinder (24) between a hydraulic pump (16) and the at least one adjusting cylinder (5, 6) is connected.
6. Kehraggregat nach Anspruch 4 oder Anspruch 5 , dadurch gekennzeichnet, daß zwischen Hydraulikpumpe (16) und Speisezylinder (24) ein Umschaltventil (15) vorgesehen ist, das eine direkte Beaufschlagung des mindestens einen Verstellzylinders (5, 6) unter Umgehung des Speisezylinders (24) ermöglicht.6. Sweeping unit according to claim 4 or claim 5, characterized in that between the hydraulic pump (16) and feed cylinder (24) a changeover valve (15) is provided, which is a direct action on the at least one adjusting cylinder (5, 6) bypassing the feed cylinder ( 24) enables.
7. Kehraggregat nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß der Kolben des Speisezylinders (24) mit einer Zähl und/oder Wegmeßeinrichtung (Z) in Verbindung steht, deren Signal auf das Steuergerät (9) geschaltet ist.7. Sweeping unit according to one of claims 4 to 6, characterized in that the piston of the feed cylinder (24) with a counting and / or displacement measuring device (Z) is connected, the signal of which is connected to the control unit (9).
8. Kehraggregat nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß auf den Kolben des Speisezylinders (8) ein mechanischer Versteilantrieb wirkt. 8. Sweeping unit according to one of claims 4 to 6, characterized in that a mechanical adjusting drive acts on the piston of the feed cylinder (8).
EP00942073A 1999-06-17 2000-06-15 Sweeping unit Expired - Lifetime EP1108091B1 (en)

Applications Claiming Priority (3)

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DE19927592A DE19927592C1 (en) 1999-06-17 1999-06-17 Sweeping unit
DE19927592 1999-06-17
PCT/EP2000/005486 WO2000079058A1 (en) 1999-06-17 2000-06-15 Sweeping unit

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EP1108091A1 true EP1108091A1 (en) 2001-06-20
EP1108091B1 EP1108091B1 (en) 2004-09-01

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US (1) US6678912B1 (en)
EP (1) EP1108091B1 (en)
AT (1) ATE275220T1 (en)
CA (1) CA2340754C (en)
DE (2) DE19927592C1 (en)
NO (1) NO333878B1 (en)
PL (1) PL346014A1 (en)
RU (1) RU2241091C2 (en)
WO (1) WO2000079058A1 (en)

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USD907868S1 (en) 2019-01-24 2021-01-12 Karcher North America, Inc. Floor cleaner

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Publication number Priority date Publication date Assignee Title
US9730566B2 (en) 2003-05-14 2017-08-15 Kärcher North America, Inc. Floor treatment apparatus
US9757005B2 (en) 2003-05-14 2017-09-12 Kärcher North America, Inc. Floor treatment apparatus
US10555657B2 (en) 2003-05-14 2020-02-11 Kärcher North America, Inc. Floor treatment apparatus
USD907868S1 (en) 2019-01-24 2021-01-12 Karcher North America, Inc. Floor cleaner

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US6678912B1 (en) 2004-01-20
DE19927592C1 (en) 2001-02-08
CA2340754C (en) 2006-04-18
RU2241091C2 (en) 2004-11-27
NO333878B1 (en) 2013-10-07
PL346014A1 (en) 2002-01-14
CA2340754A1 (en) 2000-12-28
EP1108091B1 (en) 2004-09-01
NO20010751D0 (en) 2001-02-14
ATE275220T1 (en) 2004-09-15
NO20010751L (en) 2001-04-11
DE50007608D1 (en) 2004-10-07
WO2000079058A1 (en) 2000-12-28

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