US3656137A - Conveyor band monitoring arrangement - Google Patents

Conveyor band monitoring arrangement Download PDF

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Publication number
US3656137A
US3656137A US878374A US3656137DA US3656137A US 3656137 A US3656137 A US 3656137A US 878374 A US878374 A US 878374A US 3656137D A US3656137D A US 3656137DA US 3656137 A US3656137 A US 3656137A
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US
United States
Prior art keywords
circuit
tuned
conveyor band
arrangement
frequency
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Expired - Lifetime
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US878374A
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English (en)
Inventor
Walter Ratz
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.)
Bergwerksverband GmbH
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Bergwerksverband GmbH
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Filing date
Publication date
Application filed by Bergwerksverband GmbH filed Critical Bergwerksverband GmbH
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Publication of US3656137A publication Critical patent/US3656137A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
    • B65G43/02—Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load carriers, e.g. for interrupting the drive in the event of overheating

Definitions

  • ABSTRACT An arrangement for monitoring the operating condition of conveyor bands by providing them with conductive loops spaced along the conveying path of the band.
  • Each of the con ductive loops short-circuits a respective tuned circuit which can transmit through a receiver situated outside of the conveyor.
  • the receiver emits a signal directed to a warning circuit and/or a control circuit through which the drive of the conveyor may he stopped.
  • the tuned circuit is comprised of a capacitor and inductor connected in parallel, and the receiver frequency is wobbled to compensate for any variations in the characteristics of the electrical components, for maintaining the monitoring equipment in operation under such variations in the circuit components.
  • the arrangement is such that the fabrication of the conveyor bands, in this manner, is significantly simplified, and the conveyor bands can be readily monitored in operation.
  • the monitoring arrangement of the present invention consists of conductive loops which extend for the entire width of the band and are inserted in the conveyor band.
  • a high frequency tuned circuit is, furthermore, short-circuited by each one of the conductive loops in the conveyor band, and this tuned circuit is also inserted in the conveyor band.
  • a stationary monitor outside of the conveyor band is located within the electromagnetic operative region of the tuned circuit in or on the conveyor band.
  • a high frequency oscillator serves as the electrical monitor, and comprises a capacitor and an inductance which constitute a tuned circuit.
  • Thisoscillating circuit in the monitoring unit is damped by the high frequency tuned circuit in the conveyor band, as soon as a tear in the short-circuiting loop opens the circuit and permits, thereby, both tuned circuits to be in mutal each other.
  • This feature is based on the condition that both tuned circuits are tuned to the same frequency.
  • the amplitude of the voltage signal fromthe oscillator decreases, thereby, and as a result of being applied to a switching amplifier, a relay is used to disconnect the motor which drives the conveyor, when this amplitude drops below a predetermined level.
  • the actuation of the relay may be used to actuate further a warning arrangement.
  • Electrical monitoring units may be advantageously placed at where the conveyor band turns; however such monitoring units or further monitoring units may also be placed along the length of the band.
  • the frequency of the oscillator circuit is wobbled in the conventional manner, by approximately plus or minus l percent of its nominal frequency. Assurance is thereby had that even when the resonent frequency of the tuned circuit in the conveyor band deviates from the designated frequency, the desired coupling or influence between the tuned circuit of the conveyor band and that of the monitoring unit outside of the conveyor band is maintained. In this manner, the feature is also achieved that even when the characteristics of the electrical components vary, the tuned circuits, which mutually act on each other when the conductive loop is open, will always be in resonance.
  • Conductive loops are spaced along the band and traverse the entire width of the band. These conductive loops short-circuit respective tuned circuit comprised of a capacitor and inductor. One tuned circuits is provided for each conductive loop. External to the conveyor is a receiver tuned to the frequency of the tuned circuits. Whenever one of the conductive loops is opened through, for example, a tear in the conveyor band, the receiver provides a signal to either a warning circuit or a control circuit, which stops the conveyor from moving further. The frequency of the receiver is wobbled in order to compensate for any changes in characteristics of the electrical components used in the tuned circuits.
  • a conveyor band I has regularly spaced tuned circuits 18 located in proximity of one of its conveyor band edges. These tuned circuits are selectively spaced from each other by, for example, 25 meters, and consist of the capacitor 2 and the inductance 3. These elements are shortcircuited through the conductiveloops 4 which extend for. the entire width of the conveyor band.
  • the tuned circuit 18 acts upon a tuned circuit 19 arranged outside of the conveyor band and is electromagnetically coupled with the tuned circuit 18
  • the tuned circuit 19, which consists of a capacitor 5 andinductance 6, determines the frequency of the oscillator 7.
  • the inductance 6 forms the monitoring head which, when the shorting loop 4 is open, interacts with the inductance on the conveyor band, when an inductance 3 passes by the inductance 6.
  • the electromagnetic coupling between the tuned circuits 18 and 19 damps the latter, reducing the amplitude of the output of the tuned circuit 19. This amplitude becomes measured with the: aid of a diode 17, and the signal is then applied to a threshold and switching amplifier 8.
  • the amplifier 8 actuates, in a known manner, the coil of a relay 9 which, in turn, operates the switch 10 associated with the relay to turn on a warning signal and/or to turn off the conveyor band.
  • the warning signal device and/or the conveyor motor control are connected to the terminals 11 and 12.
  • the output voltage of a saw tooth generator 13 is connected by a decoupling resistor 14 and by a high frequency bypass capacitor 15 to a capacitance diode 16, this output voltage, so changing the capacitance of the latter that the oscillator 7, the frequency of which is determined by the tuned circuit 19, is also influenced by the capacitance of the capacitance diode 16 so as to wobble the oscillator frequency through a certain range.
  • An arrangement for continuously determining the presence of tears and breaks in a conveyor band comprising, in combination, a plurality of tuned circuits spaced along the length of the conveyor band and moving therewith, each of said tuned circuits being resonant at at least approximately the same frequency; a respective inductive shorting loop connected in parallel with each tuned circuit to short the latter, said inductive shorting loop tuning said tuned circuit and having a first resonant frequency when said loop is continuously conductive, said tuned circuit having a second resonance frequency when said loop is open and nonconductive, the shorting loops being spaced along the length of the conveyor band and moving therewith, each said shorting loop extending transversely of the conveyor band so as to cover at least a part of the width of the band; and stationary circuit monitoring means spaced from the conveyor band so that said plurality of tuned circuits, during operation of the conveyor band, one by one pass by said circuit monitoring means, for producing an electric signal whenever a respective tuned circuit passes by and
  • circuit monitoring means includes means for producing an alternating current electromagnetic field varying at a frequency at least approximately equal to the resonant frequency of said plurality of tuned circuits, said circuit monitoring means and a respective tuned circuit being electromagnetically coupled together when the latter passes by the former, the former being damped when the shorting loop of the respective tuned circuit is open,
  • said means of said circuit monitoring means includes an oscillator of which the frequency is at least approximately the resonant frequency of said plurality of tuned circuits.
  • circuit monitoring means further includes means for wobbling the output frequency of said oscillator through a predetermined range of frequencies, which range includes the resonant frequency of said plurality of tuned circuits.
  • fur er including switch means operated by said electric signal for shutting down the conveyor and/or turning on a warning signal.
  • each said shorting loop covers at least the major part of the width of the conveyor band.
  • An arrangement for continuously determining the presence of tears and breaks in a conveyor band comprising, in combination, a plurality of tuned circuits spaced along the length of the conveyor band and moving therewith, each of said tuned circuits being resonant at at least approximately the same frequency; a respective shorting loop connected to each tuned circuit to short the latter, the shorting loops being spaced along the length of the conveyor band and moving therewith, each said shorting loop extending transversely of the conveyor band so as to cover at least a part of the width of the band; stationary circuit monitoring means spaced from the conveyor band so that said plurality of tuned circuits, during operation of the conveyor band, one by one passes by said circuit monitoring means, for producing an electric signal whenever a respective tuned circuit passes by and said shorting loop thereof is open thereby indicating a break or tear in the conveyor band at that position, said circuit monitoring means including means for producing an alternating current electromagnetic field varying at a frequency at least approximately equal to the resonant frequency of said plurality of tuned circuits, said circuit monitoring means and a respective tuned

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  • Control Of Conveyors (AREA)
  • Geophysics And Detection Of Objects (AREA)
US878374A 1968-11-22 1969-11-20 Conveyor band monitoring arrangement Expired - Lifetime US3656137A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681810387 DE1810387A1 (de) 1968-11-22 1968-11-22 UEberwachungseinrichtung fuer Foerderbaender

Publications (1)

Publication Number Publication Date
US3656137A true US3656137A (en) 1972-04-11

Family

ID=5714049

Family Applications (1)

Application Number Title Priority Date Filing Date
US878374A Expired - Lifetime US3656137A (en) 1968-11-22 1969-11-20 Conveyor band monitoring arrangement

Country Status (8)

Country Link
US (1) US3656137A (de)
JP (1) JPS5032514B1 (de)
AT (1) AT292553B (de)
BE (1) BE740536A (de)
CH (1) CH502935A (de)
DE (1) DE1810387A1 (de)
FR (1) FR2023843B1 (de)
GB (1) GB1234315A (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750129A (en) * 1970-09-07 1973-07-31 Tadashi Wakabayoshi Kowa Conveyor belt apparatus
US3792459A (en) * 1972-03-20 1974-02-12 F Snyder Conveyor belt rip detector
US3831161A (en) * 1972-06-08 1974-08-20 Goodyear Tire & Rubber Fail-safe monitoring apparatus
US4087800A (en) * 1976-10-29 1978-05-02 The B. F. Goodrich Company Conveyor belt monitoring system
US4328479A (en) * 1978-06-26 1982-05-04 Matra, A French Society Installation for detecting anomalies in inflating of the tires of a guided vehicle
US4350971A (en) * 1979-09-13 1982-09-21 Lucas Industries Limited Circuit for use in the detection of the condition of an isolated switch contact
US4587852A (en) * 1983-06-21 1986-05-13 Coal Industry (Patents) Limited Conveyor belt tension sensing
US4854446A (en) * 1988-08-03 1989-08-08 The Goodyear Tire & Rubber Company Electrical conductor
WO2000053517A1 (en) 1999-03-10 2000-09-14 Canada Conveyor Belt Co., Ltd. Conveyor belt fault detection apparatus and method
US20020145529A1 (en) * 2000-11-16 2002-10-10 Larry Kuzik Conveyor belt fault detection apparatus and method
US20040262132A1 (en) * 2001-11-02 2004-12-30 Pauley Timothy Joseph Method and system for conveyor belt monitoring
US20070102264A1 (en) * 2005-11-08 2007-05-10 Wallace Jack B Method for self-synchronizing a conveyor belt sensor system
US20100025198A1 (en) * 2008-08-04 2010-02-04 Jack Bruce Wallace Sensor system for a conveyor belt
US20120081818A1 (en) * 2010-10-04 2012-04-05 Siemens Industry, Inc. System and Method for Fast Discharge of a Ring Motor Field
US20130093436A1 (en) * 2010-04-15 2013-04-18 AND Technology and Research Ltd. Electromagnetic method for sensing the relative position of two items using coupled tuned circuits
US20160103084A1 (en) * 2014-04-15 2016-04-14 Laitram, L.L.C. Conveyor belt measuring system
US20170028318A1 (en) * 2013-11-28 2017-02-02 Clear Edge-Germany Gmbh Tower press belt
US10343848B2 (en) * 2015-05-21 2019-07-09 Ifm Electronic Gmbh Device for monitoring a belt tear in a conveyor belt
US10597236B2 (en) 2014-04-15 2020-03-24 Laitram, L.L.C. Capacitively coupled conveyer measuring system
US20220250850A1 (en) * 2021-02-05 2022-08-11 AUMUND Fördertechnik GmbH Conveyor with clamping connection and method for operating a conveyor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1444536A (en) * 1972-08-03 1976-08-04 Lucas Electrical Ltd Tyre pressure monitoring system
US4229735A (en) * 1978-01-23 1980-10-21 The B. F. Goodrich Company Rip detector signal detection circuit
DE2812796C2 (de) * 1978-03-23 1983-03-03 Ruhrkohle Ag, 4300 Essen Längsschlitzüberwachungseinrichtung von Gurtbändern für Förderer
DE19618366A1 (de) * 1996-05-08 1997-11-13 Beumer Maschf Bernhard Einrichtung zum Überwachen der Schrauben-Vorspannung einer Klemmeinrichtung eines Becherwerksgurtes
CN103848185B (zh) * 2012-12-04 2018-12-11 郑严国 皮带机防撕裂检测杆

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2894246A (en) * 1957-05-06 1959-07-07 Raymond J Stockholm Tire alarm system
US2932382A (en) * 1958-03-06 1960-04-12 Glen S James Automatic protective device and method
US2978636A (en) * 1957-04-30 1961-04-04 Viking Instr Inc Flaw detecting apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2970211A (en) * 1958-04-01 1961-01-31 Stin Train-end signalling device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978636A (en) * 1957-04-30 1961-04-04 Viking Instr Inc Flaw detecting apparatus
US2894246A (en) * 1957-05-06 1959-07-07 Raymond J Stockholm Tire alarm system
US2932382A (en) * 1958-03-06 1960-04-12 Glen S James Automatic protective device and method

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750129A (en) * 1970-09-07 1973-07-31 Tadashi Wakabayoshi Kowa Conveyor belt apparatus
US3792459A (en) * 1972-03-20 1974-02-12 F Snyder Conveyor belt rip detector
US3831161A (en) * 1972-06-08 1974-08-20 Goodyear Tire & Rubber Fail-safe monitoring apparatus
US4087800A (en) * 1976-10-29 1978-05-02 The B. F. Goodrich Company Conveyor belt monitoring system
US4328479A (en) * 1978-06-26 1982-05-04 Matra, A French Society Installation for detecting anomalies in inflating of the tires of a guided vehicle
US4350971A (en) * 1979-09-13 1982-09-21 Lucas Industries Limited Circuit for use in the detection of the condition of an isolated switch contact
US4587852A (en) * 1983-06-21 1986-05-13 Coal Industry (Patents) Limited Conveyor belt tension sensing
US4854446A (en) * 1988-08-03 1989-08-08 The Goodyear Tire & Rubber Company Electrical conductor
WO2000053517A1 (en) 1999-03-10 2000-09-14 Canada Conveyor Belt Co., Ltd. Conveyor belt fault detection apparatus and method
US20020145529A1 (en) * 2000-11-16 2002-10-10 Larry Kuzik Conveyor belt fault detection apparatus and method
US6781515B2 (en) * 2000-11-16 2004-08-24 Canada Conveyor Belt., Co., Ltd. Conveyor belt fault detection apparatus and method
US20040262132A1 (en) * 2001-11-02 2004-12-30 Pauley Timothy Joseph Method and system for conveyor belt monitoring
US7740128B2 (en) * 2005-11-08 2010-06-22 Veyance Technologies, Inc. Method for self-synchronizing a conveyor belt sensor system
US20070102264A1 (en) * 2005-11-08 2007-05-10 Wallace Jack B Method for self-synchronizing a conveyor belt sensor system
US7810634B2 (en) 2008-08-04 2010-10-12 Veyance Technologies Inc. Sensor system for a conveyor belt
US20110024269A1 (en) * 2008-08-04 2011-02-03 Veyance Technologies, Inc. Sensor system for a conveyor belt
US20100025198A1 (en) * 2008-08-04 2010-02-04 Jack Bruce Wallace Sensor system for a conveyor belt
US8256607B2 (en) 2008-08-04 2012-09-04 Veyanee Technologies Inc. Sensor system for a conveyor belt
US20130093436A1 (en) * 2010-04-15 2013-04-18 AND Technology and Research Ltd. Electromagnetic method for sensing the relative position of two items using coupled tuned circuits
US8803468B2 (en) * 2010-10-04 2014-08-12 Siemens Industry, Inc. System and method for fast discharge of a ring motor field
CN103201947A (zh) * 2010-10-04 2013-07-10 西门子工业公司 用于环形电机场的快速放电的***和方法
US20120081818A1 (en) * 2010-10-04 2012-04-05 Siemens Industry, Inc. System and Method for Fast Discharge of a Ring Motor Field
US20170028318A1 (en) * 2013-11-28 2017-02-02 Clear Edge-Germany Gmbh Tower press belt
US20160103084A1 (en) * 2014-04-15 2016-04-14 Laitram, L.L.C. Conveyor belt measuring system
US10191001B2 (en) * 2014-04-15 2019-01-29 Laitram, L.L.C. Conveyor-belt system for measuring conditions that vary the resonant frequency of a resonant circuit
US10597236B2 (en) 2014-04-15 2020-03-24 Laitram, L.L.C. Capacitively coupled conveyer measuring system
US10343848B2 (en) * 2015-05-21 2019-07-09 Ifm Electronic Gmbh Device for monitoring a belt tear in a conveyor belt
US20220250850A1 (en) * 2021-02-05 2022-08-11 AUMUND Fördertechnik GmbH Conveyor with clamping connection and method for operating a conveyor
US11858744B2 (en) * 2021-02-05 2024-01-02 AUMUND Fördertechnik GmbH Conveyor with clamping connection and method for operating a conveyor

Also Published As

Publication number Publication date
FR2023843B1 (de) 1973-04-06
FR2023843A1 (de) 1970-08-21
GB1234315A (de) 1971-06-03
DE1810387A1 (de) 1970-06-11
AT292553B (de) 1971-09-10
BE740536A (de) 1970-04-01
CH502935A (de) 1971-02-15
JPS5032514B1 (de) 1975-10-21

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