DE102010047198A1 - Distance measuring device for machine tools, has high frequency oscillator having resonant circuit formed by capacitance between sensing electrode and leading workpiece surface and inductance of coil, to supply signal based on capacitance - Google Patents
Distance measuring device for machine tools, has high frequency oscillator having resonant circuit formed by capacitance between sensing electrode and leading workpiece surface and inductance of coil, to supply signal based on capacitance Download PDFInfo
- Publication number
- DE102010047198A1 DE102010047198A1 DE201010047198 DE102010047198A DE102010047198A1 DE 102010047198 A1 DE102010047198 A1 DE 102010047198A1 DE 201010047198 DE201010047198 DE 201010047198 DE 102010047198 A DE102010047198 A DE 102010047198A DE 102010047198 A1 DE102010047198 A1 DE 102010047198A1
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- DE
- Germany
- Prior art keywords
- measuring device
- capacitance
- electrode
- sensor
- frequency oscillator
- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
- B23K7/102—Auxiliary devices, e.g. for guiding or supporting the torch for controlling the spacial relationship between the workpieces and the gas torch
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
- B23Q17/2233—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work for adjusting the tool relative to the workpiece
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
- G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
- G01D5/2417—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying separation
Abstract
Description
Die vorliegende Erfindung betrifft eine kapazitive Messeinrichtung zur berührungslosen Abstandsmessung für Bearbeitungswerkzeuge, wie z. B. Autogen- oder Plasma-Schneidbrenner, bei metallischen Werkstückoberflächen. Hierbei wird die Abstandabhängigkeit der Kapazität ausgenutzt, die zwischen der Werkstückoberfläche und einer Sensorelektrode besteht, die meist ringförmig um die Brennerdüse herum angeordnet ist. Die Auswertung des Kapazitätswertes erfolgt meist durch einen LC-Oszillators, wobei die abstandsabhängige Kapazität (im folgenden als Messkapazität bezeichnet) Teil der Schwingkreiskapazität des Oszillators ist.The present invention relates to a capacitive measuring device for non-contact distance measurement for processing tools, such. As oxy-fuel or plasma cutting torch, metallic workpiece surfaces. Here, the distance dependence of the capacitance is utilized, which exists between the workpiece surface and a sensor electrode, which is usually arranged in a ring around the burner nozzle around. The evaluation of the capacitance value is usually carried out by an LC oscillator, wherein the distance-dependent capacitance (hereinafter referred to as the measuring capacitance) is part of the resonant circuit capacitance of the oscillator.
Eine derartige Messeinrichtung ist z. B. aus der Patentschrift
Ein Resonanzkreis, bestehend aus der Serienschaltung der Spule
Das Oszillatorfrequenzsignal wird ggf. durch einen Verstärker
Beim Brennschneiden ist eine hohe Bearbeitungsqualität nur dann sichergestellt, wenn der Abstand zwischen Werkstück und Werkzeug weitgehend konstant ist. Daher ist eine solche kapazitive Messeinrichtung in der Regel in einen Abstandsregelkreis integriert, wie es z. B. in der Patentschrift
Neben der Spule
Das verbindende Koaxkabel
Kleinflächige Sensorelektroden, die für eine genaue Abstandsmessung an Werkstückkanten oder -ausschnitten wünschenswert wären, sind mit diesem Stand der Technik nicht zuverlässig einsetzbar. Das Koaxkabel sollte daher möglichst kurz sein. In der Praxis wird eine Länge von unter 1.20 m gewählt. Das erfordert, dass die Elektronikeinheit, bzw. zumindest der Oszillator
Ausgehend vom geschilderten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zu Grunde, eine verbesserte kapazitive Messeinrichtung zur Abstandsmessung an Bearbeitungswerkzeugen zu schaffen, die die Messeigenschaften bei Elektroden mit geringer Messkapazität verbessert. Diese Aufgabe wird gelöst durch die kapazitive Messeinrichtung gemäß Hauptanspruch
Durch die Integration der Oszillatorschaltung mit der Sensorhalterung entfällt das Koaxkabel
Über das Koaxkabel
Es ist allgemein bekannt, dass die Übertragung von Hochfrequenzsignalen gegenüber im Industriebereich vorkommenden elektromagnetischen Störsignalen praktisch immun ist, im Gegensatz zu Gleichspannungssignalen gemäß dem Stand der Technik gemäß
In
Die in
Ausgehend vom geschilderten Stand der Technik und dem Hauptanspruch
Diese Aufgabe wird gelöst durch die kapazitive Messeinrichtung gemäß Anspruch 4. Wie in
Gegenüber der in
Dazu ist der Eingang des Schirmtreiber-Verstärkers an der Verbindung zwischen Spule und Sensorzuführung angeschlossen; sein Ausgang ist mit der Schirmhülse und der Schirmelektrode verbunden. Der Verstärkungsfaktor soll möglichst nahe bei G = 1 liegen, um gleiches Potential bei Schirmelektrode bzw. Schirmhülse und Sensorelektrode und so eine optimale Unterdrückung der parasitären Kapazitäten zu bewirken. Die Amplitudenbegrenzungsfunktion sorgt dafür, dass die Amplitude des Eingangssignals des Schirmtreiber-Verstärkers dessen linearen Aussteuerungsbereich nicht überschreitet. Das ist deshalb wichtig, weil ohne Amplitudenbegrenzung in Oszillatorschaltungen auf Grund der Resonanzüberhöhung sehr hohe Amplitudenwerte auftreten würden, so daß der Schirmtreiber-Verstärker nicht in der Lage wäre, für die Schirmelektrode ein nach Betrag und Phase exakt gleiches Hochfrequenz-Wechselspannungspotential wie bei der Sensorelektrode bereit zu stellen.For this purpose, the input of the screen driver amplifier is connected to the connection between the coil and the sensor feed; its output is connected to the shielding sleeve and the shielding electrode. The amplification factor should be as close as possible to G = 1 in order to bring about the same potential for shielding electrode or shielding sleeve and sensor electrode and thus optimum suppression of the parasitic capacitances. The amplitude limiting function ensures that the amplitude of the input signal of the screen driver amplifier does not exceed its linear modulation range. This is important because without amplitude limiting in oscillator circuits due to the resonance peaking very high amplitude values would occur, so that the screen driver amplifier would not be able to provide for the shield electrode a magnitude and phase exactly the same high frequency AC potential as in the sensor electrode ready to deliver.
Geeignete Amplitudenbegrenzungsschaltungen sind dem Hochfrequenz-Fachmann bekannt. Eine geeignete Fundstelle ist das Buch
Die Amplitudenbegrenzungsfunktion kann sich auch an anderer Stelle befinden, als in
Es wird bei der erfindungsgemäßen Lösung ein Serienresonanzkreis, wie in
Die Schirmelektrode kann die Sensorelektrode auch in geringerem Umfang, als in
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- US 3651505 [0002, 0022] US 3651505 [0002, 0022]
- US 3928790 [0005] US 3928790 [0005]
- DE 10059232 [0006] DE 10059232 [0006]
- DE 2556218 A [0006] DE 2556218 A [0006]
- US 4058765 [0017] US 4058765 [0017]
Zitierte Nicht-PatentliteraturCited non-patent literature
-
Schünemann, K. und Hintz, A., „Bauelemente und Schaltungen der Hochfrequenztechnik, Teil 1”, Hüthig-Verlag, Heidelberg (1989), S. 392–295 [0020] Schünemann, K. and Hintz, A., "Components and Circuits of High Frequency Technology,
Part 1", Hüthig-Verlag, Heidelberg (1989), pp. 392-295 [0020]
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010047198 DE102010047198A1 (en) | 2010-09-30 | 2010-09-30 | Distance measuring device for machine tools, has high frequency oscillator having resonant circuit formed by capacitance between sensing electrode and leading workpiece surface and inductance of coil, to supply signal based on capacitance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010047198 DE102010047198A1 (en) | 2010-09-30 | 2010-09-30 | Distance measuring device for machine tools, has high frequency oscillator having resonant circuit formed by capacitance between sensing electrode and leading workpiece surface and inductance of coil, to supply signal based on capacitance |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102010047198A1 true DE102010047198A1 (en) | 2012-04-05 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE201010047198 Withdrawn DE102010047198A1 (en) | 2010-09-30 | 2010-09-30 | Distance measuring device for machine tools, has high frequency oscillator having resonant circuit formed by capacitance between sensing electrode and leading workpiece surface and inductance of coil, to supply signal based on capacitance |
Country Status (1)
Country | Link |
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DE (1) | DE102010047198A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3842733A4 (en) * | 2019-08-02 | 2022-05-18 | Shenzhen Yuejiang Technology Co., Ltd. | Sensing circuit, logic circuit board, joint control board, main controller board, and robot |
DE102021123872A1 (en) | 2021-09-15 | 2023-03-16 | Iht Automation Gmbh & Co. Kg | Device for welding or cutting workpieces |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3651505A (en) | 1969-03-24 | 1972-03-21 | Schmall Margit | Capacitive distance measuring |
US3928790A (en) | 1973-06-16 | 1975-12-23 | Precitec Gmbh | Regulating process and device |
DE2556218A1 (en) | 1975-12-13 | 1977-06-16 | Battelle Institut E V | Automatic adjustment of tool distance in flame cutting metals - by use of capacitative measuring electrodes whose output is corrected by compensating electrode |
US4058765A (en) | 1976-06-07 | 1977-11-15 | David Richardson | General displacement sensor |
DE10059232A1 (en) | 2000-11-29 | 2002-06-13 | Karl Heinz Schmall | Working tool spacing detector has capacitative or inductive sensor mounted in exchangeable rotary mounting |
-
2010
- 2010-09-30 DE DE201010047198 patent/DE102010047198A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3651505A (en) | 1969-03-24 | 1972-03-21 | Schmall Margit | Capacitive distance measuring |
US3928790A (en) | 1973-06-16 | 1975-12-23 | Precitec Gmbh | Regulating process and device |
DE2556218A1 (en) | 1975-12-13 | 1977-06-16 | Battelle Institut E V | Automatic adjustment of tool distance in flame cutting metals - by use of capacitative measuring electrodes whose output is corrected by compensating electrode |
US4058765A (en) | 1976-06-07 | 1977-11-15 | David Richardson | General displacement sensor |
DE10059232A1 (en) | 2000-11-29 | 2002-06-13 | Karl Heinz Schmall | Working tool spacing detector has capacitative or inductive sensor mounted in exchangeable rotary mounting |
Non-Patent Citations (1)
Title |
---|
Schünemann, K. und Hintz, A., "Bauelemente und Schaltungen der Hochfrequenztechnik, Teil 1", Hüthig-Verlag, Heidelberg (1989), S. 392-295 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3842733A4 (en) * | 2019-08-02 | 2022-05-18 | Shenzhen Yuejiang Technology Co., Ltd. | Sensing circuit, logic circuit board, joint control board, main controller board, and robot |
DE102021123872A1 (en) | 2021-09-15 | 2023-03-16 | Iht Automation Gmbh & Co. Kg | Device for welding or cutting workpieces |
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Legal Events
Date | Code | Title | Description |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20150401 |