EP1108092A1 - Sweeping unit - Google Patents

Sweeping unit

Info

Publication number
EP1108092A1
EP1108092A1 EP00943809A EP00943809A EP1108092A1 EP 1108092 A1 EP1108092 A1 EP 1108092A1 EP 00943809 A EP00943809 A EP 00943809A EP 00943809 A EP00943809 A EP 00943809A EP 1108092 A1 EP1108092 A1 EP 1108092A1
Authority
EP
European Patent Office
Prior art keywords
adjusting
sweeping
roller brush
cylinder
hydraulic
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
EP00943809A
Other languages
German (de)
French (fr)
Other versions
EP1108092B1 (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 EP1108092A1 publication Critical patent/EP1108092A1/en
Application granted granted Critical
Publication of EP1108092B1 publication Critical patent/EP1108092B1/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 hydraulic adjusting cylinder and a control unit.
  • Sweeping units of the type specified above are known in various designs, 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 hydraulic adjusting cylinder does not have a control unit is set, but rather is part of a hydraulic control circuit and in addition that the support frame does not have support wheels; Such sweeping units can be found, for example, in German laid-open documents 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 one Cleaning result with little bristle wear. If the sweeping mirror width is below the optimal value, the cleaning performance drops noticeably. With a sweeping mirror width above the optimal value, however, the bristle wear increases noticeably without any noticeable improvement in the cleaning result.
  • the sweeping mirror width be set with the desired degree of accuracy. This applies in particular to the state of the art according to the generic publications. In this context, it should be borne in mind that with a conventional roller brush with a diameter of 914 mm, the height adjustment of 1 mm means a change in the sweeping level of approx. 60 mm. The fact that values between 60 mm and 100 mm are considered to be a suitable sweeping mirror width makes it clear what requirements are placed in practice on the accuracy of the adjustment unit.
  • the present invention aims to provide a sweeping unit of the generic type in which the optimal sweeping level can be set with a high degree of accuracy.
  • this object is achieved in that a feed cylinder is hydraulically connected to the at least one adjusting cylinder, the piston or other signal transmitter of which is connected to a counting and / or displacement measuring device, the signal of which is connected to the control unit, or a mechanical adjusting drive is connected and the hydraulic communicating with the at least one adjusting cylinder Working space has a smaller cross-sectional area than the at least one adjusting 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 at least one adjusting cylinder from a reference position into its working position corresponding to the optimal sweeping mirror width.
  • the reference position can correspond to various characteristic positions of the roller brush relative to the surface to be cleaned, with reference to which the control unit calculates the infeed movement of the at least one adjusting cylinder that is required to bring the roller brush into its working position characterized by the optimal sweeping mirror width.
  • the ground contact position of the roller brush and the corresponding position of the at least one adjusting cylinder are particularly preferably used as the reference position, because in this way the wear on the bristles is automatically compensated (see below).
  • a bypass line to the feed cylinder is particularly preferably a bypass line to the feed cylinder, since the latter is only required for the exact lowering of the roller brush from its ground contact position into its 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 adjustment cylinder be required.
  • the above-described design of the hydraulic system with a feed cylinder results in a particularly exact setting option for the at least one adjustment cylinder.
  • 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.
  • a sensor which detects the drive torque or the drive power of the roller brush or a quantity coupled to it, the signal of which is connected to the control unit, the control unit determining the working position of the adjusting element which corresponds to the optimum sweeping mirror width as a function of Lowering of the roller brush determined by a sudden rise in the sensor signal marked ground contact position of the adjusting member.
  • 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 for the individual sweeping operation the ground contact of the roller brush and the corresponding ground contact position of the adjusting element as a reference point for the optimum Sweeping mirror width corresponding working position of the adjusting member is pulled.
  • 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 roller brush would in other words Sweeping operation can be lowered to a position that is a certain amount (eg 2 mm) below the ground contact position. This would lead to a gradual reduction in the sweeping mirror width due to the geometric conditions as the roller brush wears down; however, this would - at least in part - be compensated for by increasing the hardness of the brush, so that the cleaning result would essentially not change.
  • 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.
  • 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.
  • 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.
  • 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 adjusting cylinders V forming hydraulic adjusting cylinders 5 and 6, the piston rod of each of the two hydraulic adjusting cylinders being connected to a support wheel 7 and 8, respectively.
  • 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.
  • the same constructions are well known, so that a detailed explanation can be omitted.
  • the sweeping unit itself is suspended from a carrier vehicle by means of a support arrangement (not shown).
  • the carrying 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 are on the surface to be cleaned unroll. 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 it connects the connections P and B on the one hand and A and T on the other hand, and the pump 16 is operated taken.
  • 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.
  • the hydraulic working space 23 of the feed cylinder 24 is filled, whereby the piston of the feed cylinder is brought into its left end position via the control valve 15 in the sump 22, displacing the hydraulic fluid present in the hydraulic working space 25.
  • 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.
  • valves 27 and 28 are switched to their flow position. In this way, hydraulic fluid reaches the hydraulic working spaces 19 and 20 of the adjusting cylinders 5 and 6 via the pump 16 and the control valve 15, which is still in the cross-over position.
  • the piston rods move in slowly, the hydraulic fluid present in the hydraulic working spaces 17 and 18 passing over the (opened) valve 28 and the back pressure valve 21 is displaced into the sump 22. This leads to a gradual lowering of the sweeping roller 1 in the direction of the surface to be cleaned.
  • 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 has a supporting frame and at least one motor-driven rotary brush which is rotationally mounted about an longitudinal axis thereof The supporting frame is provided with supporting wheels, and a distance of the wheels from the axis of the rotary brush is controlled by an adjusting device having at least one hydraulic adjusting cylinder and a control device. A supply cylinder is hydraulically connected to the at least one adjusting cylinder and has a piston, or other signalling component, connected to a metering device and/or distance measurement device. A signal from the metering and/or distance measurement device is connected to the control unit. A working area of the supply cylinder communicates hydraulically with the at least one adjusting cylinder and has a smaller cross-sectional surface area than that of the at least one adjusting cylinder. Alternatively, the piston of the supply cylinder is connected to a mechanical adjusting drive mechanism.

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 Walzenbürste, wobei der Tragrahmen Stützräder aufweist, deren vertikaler Abstand zu der Achse der Walzenbürste mittels einer Verstelleinheit veränderbar ist, welche mindestens einen hydraulischen Verstellzylinder 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 hydraulic adjusting cylinder 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 der hydraulische Verstellzylinder 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 Offenlegungsschriften 2455200 und 2821627 sowie den europäischen Patentanmeldungen 0189371 und 0843047 entnehmbar .Sweeping units of the type specified above are known in various designs, 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 hydraulic adjusting cylinder does not have a control unit is set, but rather is part of a hydraulic control circuit and in addition that the support frame does not have support wheels; Such sweeping units can be found, for example, in German laid-open documents 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 is explained in detail in the European patent specification 0372258, the optimal sweeping mirror width is characterized by a good one Cleaning result with little bristle wear. If the sweeping mirror width is below the optimal value, the cleaning performance drops noticeably. With a sweeping mirror width above the optimal value, however, the bristle wear increases noticeably without any noticeable improvement in the cleaning result.
Bei keinem der aus den oben angegebenen Publikation bekannten Kehraggregate läßt sich die Kehrspiegelbreite mit dem gewünschten Maß an Genauigkeit einstellen. Dies gilt namentlich für den Stand der Technik gemäß den gattungsbildenden Druckschriften. In diesem Zusammenhang ist zu bedenken, daß bei einer üblichen Walzenbürste mit einem Durchmesser von 914 mm die Höhenverstellung von 1 mm eine Kehrspiegelveränderung von ca. 60 mm bedeutet. Die Tatsache, daß als geeignete Kehrspiegelbreite Werte zwischen 60 mm und 100 mm angesehen werden, macht deutlich, welche Anforderungen in der Praxis an die Genauigkeit der Verstelleinheit gestellt werden.In none of the sweeping units known from the above-mentioned publication can the sweeping mirror width be set with the desired degree of accuracy. This applies in particular to the state of the art according to the generic publications. In this context, it should be borne in mind that with a conventional roller brush with a diameter of 914 mm, the height adjustment of 1 mm means a change in the sweeping level of approx. 60 mm. The fact that values between 60 mm and 100 mm are considered to be a suitable sweeping mirror width makes it clear what requirements are placed in practice on the accuracy of the adjustment unit.
Vor dem Hintergrund des vorstehend dargelegten Nachteils des Standes der Technik zielt die vorliegende Erfindung darauf ab, ein Kehraggregat der gattungsgemäßen Art zu schaffen, bei welchem sich der optimale Kehrspiegel mit einem hohen Maß an Genauigkeit einstellen läßt.Against the background of the above-mentioned disadvantage of the prior art, the present invention aims to provide a sweeping unit of the generic type in which the optimal sweeping level can be set with a high degree of accuracy.
Gemäß der vorliegenden Erfindung wird diese Aufgabe dadurch gelöst, daß mit dem mindestens einen Verstellzylinder ein Speisezylinder hydraulisch verbunden ist, dessen Kolben oder sonstiger Signalgeber mit einer Zähl- und/oder Wegmeßeinrichtung, dessen Signal auf das Steuergerät geschaltet ist, oder einem mechanischen Verstell- antrieb in Verbindung steht und dessen mit dem mindestens einen Verstellzylinder kommunizierender hydraulischer Arbeitsraum eine geringeren Querschnittsfläche aufweist als der mindestens eine Verstellzylinder.According to the present invention, this object is achieved in that a feed cylinder is hydraulically connected to the at least one adjusting cylinder, the piston or other signal transmitter of which is connected to a counting and / or displacement measuring device, the signal of which is connected to the control unit, or a mechanical adjusting drive is connected and the hydraulic communicating with the at least one adjusting cylinder Working space has a smaller cross-sectional area than the at least one adjusting cylinder.
Der Speisezylinder dient dabei der volumetrischen Zumessung der Hydraulikflüssigkeit zu dem mindestens einen Verstellzylinder, die der Zustellbewegung des mindestens einen Verstellzylinders von einer Referenz - Stellung in seine der optimalen Kehrspiegelbreite entsprechende Arbeitsstellung entspricht. Die Referenzstellung kann dabei verschiedenen charakteristische Stellungen der Walzenbürste relativ zu der zu reinigenden Oberfläche entsprechen, unter Bezugnahme auf welche das Steuergerät diejenige Zustellbewegung des mindestens einen Verstellzylinders berechnet, die erforderlich ist, um die Walzenbürste in ihre durch die optimale Kehrspiegelbreite gekennzeichnete Arbeitsstellung zu bringen. Besonders bevorzugt wird als Referenzstellung die Bodenkontaktstellung der Walzenbürste und die korrespondierende Stellung des mindestens einen Verstellzylinders herangezogen, weil auf diese Weise der Borstenverschleiß automatisch kompensiert wird (s.u.). Besonders bevorzugt besteht dabei eine Umgehungsleitung zu dem Speisezylinder, da letzterer lediglich für die exakte Absenkung der Walzenbürste aus ihrer Bodenkontakt- Stellung in ihre Arbeitsstellung benötigt wird. Weder beim Absenken der Walzenbürste in ihre Bodenkontakt - Stellung 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 einen besonders exakten Einstellmöglichkeit für den mindestens einen Verstellzylinder. Zwar ist im Rahmen der vorstehend erläuterten Weiterbildung der vorliegenden Erfindung denkbar, daß auf den Kolben des Speisezylinders ein mechanischer VerStellantrieb 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.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 at least one adjusting cylinder from a reference position into its working position corresponding to the optimal sweeping mirror width. The reference position can correspond to various characteristic positions of the roller brush relative to the surface to be cleaned, with reference to which the control unit calculates the infeed movement of the at least one adjusting cylinder that is required to bring the roller brush into its working position characterized by the optimal sweeping mirror width. The ground contact position of the roller brush and the corresponding position of the at least one adjusting cylinder are particularly preferably used as the reference position, because in this way the wear on the bristles is automatically compensated (see below). There is particularly preferably a bypass line to the feed cylinder, since the latter is only required for the exact lowering of the roller brush from its ground contact position into its 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 adjustment cylinder be required. The above-described design of the hydraulic system with a feed cylinder results in a particularly exact setting option for the at least one adjustment cylinder. In the context of the development of the present invention explained above, it is conceivable 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.
Gemäß einer anderen bevorzugten Weiterbildung der Erfindung ist ein das Antriebsmoment oder die Antriebs- leistung der Walzenbürste oder eine hiermit gekoppelte Größe erfassender Sensor vorgesehen, 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 another preferred development of the invention, a sensor is provided which detects the drive torque or the drive power of the roller brush or a quantity coupled to it, the signal of which is connected to the control unit, the control unit determining the working position of the adjusting element which corresponds to the optimum sweeping mirror width as a function of Lowering of the roller brush determined by a sudden rise in the sensor signal marked ground contact position of the adjusting member.
Bei dem solchermaßen weitergebildeten 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 Bodenkontaktstellung des Verstellorgans als Bezugspunkt für die der optimalen Kehrspiegelbreite entsprechende Arbeitsstellung des Verstellorgans herange- zogen 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 erfaß .In the sweeping unit further developed in this way, 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 for the individual sweeping operation the ground contact of the roller brush and the corresponding ground contact position of the adjusting element as a reference point for the optimum Sweeping mirror width corresponding working position of the adjusting member is pulled. 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, wie sie von Kehraggregaten nach dem Stand der Technik bekannt sind, treten bei einem Kehraggregat wie vorstehend beschrieben nicht auf. Weder ist, anders als im Falle der DE-OS 2455200 und 2821627 sowie der EP-A 0189371 und 0843047, die von dem Steuergerät eingestellte Kehrspiegelbreite abhängig von den Oberflächenverhältnissen, insbesondere der Rauhigkeit der zu reinigenden Oberfläche. Ebensowenig ist, anders als im Falle der EP-B 0372258 und der DE-OS 3740215, 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 diese Weiterbildung der 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 such as are known from prior art sweeping units do not occur with a sweeping unit as described above. Unlike in the case of DE-OS 2455200 and 2821627 and EP-A 0189371 and 0843047, neither is the sweeping mirror width set by the control device dependent on the surface conditions, in particular the roughness of the surface to be cleaned. Likewise, unlike in the case of EP-B 0372258 and DE-OS 3740215, a complicated, fault-prone sensor arrangement is not required. Nevertheless, when setting the sweeping mirror width it is not based on an average degree of wear of the roller brush which is dependent on the mileage of the roller brush in question, but rather the actual degree of wear. As a result, this development of the invention provides a sweeping unit in which the optimum 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 vorstehend beschriebene Weiterbildung der Erfindung läßt sich bereits mit Vorteil einsetzen, wenn im Steuergerät die Arbeitsstellung des Verstellorgans aus dessen Bodenkontaktstellung bzw. sonstiger Referenzstellung 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 liegt. 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 development of the invention described above can already be used to advantage if the working position of the adjusting member is determined in the control device from its ground contact position or other reference position by adding a constant variable. In this case, the roller brush would in other words Sweeping operation can be lowered to a position that is a certain amount (eg 2 mm) below the ground contact position. This would lead to a gradual reduction in the sweeping mirror width due to the geometric conditions as the roller brush wears down; however, this would - at least in part - be compensated for by increasing the hardness of the brush, so that the cleaning result would essentially not change.
Eine abermals bevorzugte Weiterbildung 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 Bodenkontakt - Stellung 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.Another preferred development, however, is distinguished by the fact that the feed movement of the adjusting element, 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 derived directly from 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 that 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.
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 - 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 adjusting cylinders V forming hydraulic adjusting cylinders 5 and 6, the piston rod of each of the two hydraulic adjusting cylinders being connected to a support wheel 7 and 8, respectively. 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. The same constructions are well known, so that a 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 carrying 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 are on the surface to be cleaned unroll. 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. 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 it connects the connections P and B on the one hand and A and T on the other hand, and the pump 16 is operated taken. 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. At the same time, the hydraulic working space 23 of the feed cylinder 24 is filled, whereby the piston of the feed cylinder is brought into its left end position via the control valve 15 in the sump 22, displacing the hydraulic fluid present in the hydraulic working space 25. 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 Verstellzylinder 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 reaches the hydraulic working spaces 19 and 20 of the adjusting cylinders 5 and 6 via the pump 16 and the control valve 15, which is still in the cross-over position. The piston rods move in slowly, the hydraulic fluid present in the hydraulic working spaces 17 and 18 passing over the (opened) valve 28 and the back pressure valve 21 is displaced into the sump 22. 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 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 to 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 that in the hydraulic working space 23 existing hydraulic fluid 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 is filled again with hydraulic fluid and the process described above - opening the valves 27 and 28 and switching the 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 . 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.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. 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.
Der vorstehend beschriebene Vorgang (Feinverstellung- Senkvorgang) ist umkehrbar, wenn Ventile 13 und 14 statt 27 und 28 angesteuert werden. Auf diese Weise ergibt sich ein Feinverstellung-Hebevorgang. Damit können äußere Störeinflüsse, die sich nicht zu schnell ändern, einfach kompensiert werden. Beispielsweise beeinflußt der Pflug mit seinem Gewicht sehr stark die Geometrie des Fahrzeugrahmens bezogen auf die Fahrbahn und entsprechend den Kehrspiegel . The process described above (fine adjustment lowering process) is reversible if valves 13 and 14 are actuated instead of 27 and 28. This results in a fine adjustment lifting process. External disturbances that do not change too quickly can thus be easily compensated for. For example, the weight of the plow affects the geometry of the vehicle frame in relation to the road and, accordingly, the sweeping mirror.

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 einen hydraulischen Verstellzylinder (5, 6) und ein Steuergerät (9) umfaßt , dadurch gekennzeichnet, daß mit dem mindestens einen Verstellzylinder (5, 6) ein Speisezylinder (24) hydraulisch verbunden ist, dessen Kolben oder sonstiger Signalgeber mit einer Zähl- und/oder Wegmeßeinrichtung (Z) , deren Signal auf das Steuergerät (9) geschaltet ist, oder einem mechanischen Versteilantrieb in Verbindung steht und dessen mit dem mindestens einen Verstellzylinder kommunizierender hydraulischer Arbeitsraum (23) eine geringere Querschnittsfläche aufweist als der mindestens eine Verstellzylinder (5, 6) .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 hydraulic adjusting cylinder (5, 6) and a control device (9), characterized in that the at least one adjusting cylinder (5 , 6) a feed cylinder (24) is hydraulically connected, the piston or other signal transmitter with a counting and / or displacement measuring device (Z), the signal of which is connected to the control unit (9), or a mechanical adjusting drive and which is connected the hydraulic working space (23) communicating with the at least one adjusting cylinder has a smaller cross-sectional area than the at least one adjusting cylinder (5 , 6).
2. Kehraggregat nach Anspruch 1, dadurch gekennzeichnet, daß der Speisezylinder (24) zwischen eine Hydraulikpumpe (16) und den mindestens einen Verstellzylinder (5, 6) geschaltet ist.2. Sweeping unit according to claim 1, characterized in that the feed cylinder (24) between a hydraulic pump (16) and the at least one adjusting cylinder (5, 6) is connected.
3. Kehraggregat nach Anspruch 1 oder Anspruch 2 , 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.3. Sweeping unit according to claim 1 or claim 2, characterized in that a switching valve (15) is provided between the hydraulic pump (16) and feed cylinder (24), the one enables direct loading of the at least one adjusting cylinder (5, 6) bypassing the feed cylinder (24).
4. Kehraggregat nach einem der Ansprüche 1 bis 3, 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 .4. Sweeping unit according to one of claims 1 to 3, characterized in that a the drive torque or the drive power of the roller brush (1) or a size-coupled sensor (S) is provided, the signal of which is connected to the control unit (9), wherein the control device (9) determines the working position of the adjusting member (V) corresponding to the optimal sweeping mirror width as a function of the ground contact position of the adjusting member (V) characterized by a sudden increase in the sensor signal when the roller brush (1) is lowered.
5. Kehraggregat nach Anspruch 4 , dadurch gekennzeichnet, daß eine Meßanordnung zur Ermittlung des Durchmessers der Walzenbürste (1) vorgesehen ist, wobei das Durchmessersignal dem Steuergerät (9) zugeführt wird.5. Sweeping unit according to claim 4, 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).
6. Kehraggregat nach Anspruch 5 , dadurch gekennzeichnet, daß in dem Steuergerät (9) eine Kennkurve für die vom tatsächlichen Durchmesser der Walzenbürste (1) abhängige Zustellung des mindestens einen hydraulischen Verstellzylinders (5, 6) aus seiner Bodenkontaktstellung in seine Arbeitsstellung abgespeichert ist. 6. Sweeping unit according to claim 5, characterized in that in the control device (9) a characteristic curve for the actual diameter of the roller brush (1) dependent delivery of the at least one hydraulic adjusting cylinder (5, 6) from its ground contact position is stored in its working position.
EP00943809A 1999-06-17 2000-06-15 Sweeping unit Expired - Lifetime EP1108092B1 (en)

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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

Also Published As

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NO20010750D0 (en) 2001-02-14
RU2250293C2 (en) 2005-04-20
DE50006141D1 (en) 2004-05-27
PL346044A1 (en) 2002-01-14
ATE264947T1 (en) 2004-05-15
CA2341030A1 (en) 2000-12-28
NO332295B1 (en) 2012-08-20
NO20010750L (en) 2001-04-11
DE19927593C1 (en) 2001-04-19
US6681433B1 (en) 2004-01-27
WO2000079059A1 (en) 2000-12-28
EP1108092B1 (en) 2004-04-21

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