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GB2088442A - Improvements in Overload Protection for the Drive of Mining Equipment - Google Patents

Improvements in Overload Protection for the Drive of Mining Equipment Download PDF

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Publication number
GB2088442A
GB2088442A GB8134151A GB8134151A GB2088442A GB 2088442 A GB2088442 A GB 2088442A GB 8134151 A GB8134151 A GB 8134151A GB 8134151 A GB8134151 A GB 8134151A GB 2088442 A GB2088442 A GB 2088442A
Authority
GB
United Kingdom
Prior art keywords
drive unit
sensing means
load
coupling device
component
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
GB8134151A
Other versions
GB2088442B (en
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.)
Gewerkschaft Eisenhutte Westfalia GmbH
Original Assignee
Gewerkschaft Eisenhutte Westfalia GmbH
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 Gewerkschaft Eisenhutte Westfalia GmbH filed Critical Gewerkschaft Eisenhutte Westfalia GmbH
Publication of GB2088442A publication Critical patent/GB2088442A/en
Application granted granted Critical
Publication of GB2088442B publication Critical patent/GB2088442B/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/24—Remote control specially adapted for machines for slitting or completely freeing the mineral
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C31/00—Driving means incorporated in machines for slitting or completely freeing the mineral from the seam
    • E21C31/12—Component parts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/04—Safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H35/00—Gearings or mechanisms with other special functional features
    • F16H35/10—Arrangements or devices for absorbing overload or preventing damage by overload

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Control Of Conveyors (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

A drive unit for mining equipment is protected against overloading by electrical sensing means (14, 15) monitoring the load in a transmission component, such as a shaft (12), and a coupling device (13) which disengages the drive in the event of overloading. <IMAGE>

Description

SPECIFICATION Improvements in Overload Protection for the Drive of Mining Equipment The present invention relates in general to drives for mining equipment and more particularly to a method of, and apparatus for, overload protection of such drives.
Mining equipment, such as coal ploughs and scraper chain conveyors, nowadays require powerful drive units. Under the harsh conditions encountered in most underground mine workings the equipment is often subjected to sudden high loads and it is therefore necessary to protect the drive chains and drive units against overloading. It is well known in the art to provide shear pins which fracture in the event of overloading. Under adverse conditions, the replacement of the shear pins can be a nuisance and frequent interruptions in the mining operation are inevitable. To combat this, special auxiliary apparatus has been developed to facilitate the replacement of shear pins-see in example, German Patent Specification 2,749,865.It is also known to use special forms of coupling devices as an alternative to shear pins for overload protection-see for example German Patent Specifications 2,521,315, 2,141,304 and 2,634,918. These prior art solutions to the problem of overload protection have not been wholly satisfactory and involve considerable expense.
It is a general object of the present invention to provide an improved method of, and apparatus for, overload protection of drive units.
According to one aspect of the present invention, a method of protecting a drive unit for mining equipment against overloads comprises monitoring the dynamic load in a transmission component such as a shaft of the drive unit and actuating a coupling device in dependence on the monitoring operation to disengage the drive in the event of overloading.
In another aspect the present invention provides apparatus for use in protecting a drive unit for mining equipment against overload; said apparatus comprising sensing means for sensing the load in a transmission component of the drive unit and a coupling device which is activated by the sensing means to disengage the drive in the event of overloading. The sensing means which monitors the load in the transmission component preferably provides an electrical signal proportional to the torque transmitted through the component. As described hereinafter, in one embodiment of the invention the sensing means utilizes a strain gauge on the component in conjunction with a non-contacting inductive sensor which provides the aforesaid signal. The strain gauge may be a resistive strain gauge mounted on the output shaft of the drive unit.The signal can be evaluated by a control device which controls the operation of the coupling device. The latter may take the form of a multi-disc clutch which is operated by hydraulic or electromagnetic force. A microprocessor can serve as the control device. The control device can act on a solenoid valve to effect the actuation of the clutch.
The apparatus can be constructed at modest cost and can operate quite reliably without maintenance. Moreover, the apparatus can be incorporated with a variety of drive units without extensive modification.
The invention may be understood more readily, and various other features of the invention may become apparent from consideration of the foliowing description.
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawing, which is a schematic part-sectional plan view of a drive unit employing protection apparatus constructed in accordance with the invention.
As shown in the accompanying drawing, a drive unit 10 for use in driving a plough or conveyor of an underground mining installation, is composed of a casing containing gearing. The unit 10 has an input shaft 11 coupled to a prime mover (not shown) and an output shaft 12. The shaft 12 is driven by the shaft 11 through a gear train as represented by the chain-dotted line. The output shaft 12 extends within a driven sleeve which is normally drivably coupled thereto by way of a device 13. The device 13 may take the form of a multiple-disc clutch which is operated by electro-magnetic or hydraulic force. The device 1 3 can be selectively operated to disengage the drive to the shaft 12 in the event of an overload condition.
A measuring gauge, such as a resistive strain gauge 1 4 is attached to the shaft 12 to monitor the load, i.e. the torque, transmitted therethrough.
A sensor 1 5 in the casing, but separate from the shaft 12, detects the output from the gauge 14 and feeds a control device 1 3 via electric lines 17.
The non-contacting sensor 1 5 can employ a coil inductively coupled to the gauge 14. It is also possible to utilize an oscillator, such as an RF oscillator, which changes frequency in accordance with the variation in torque measured by the gauge 14. This oscillator, carried on the shaft 12, would be inductively coupled to a coil of the stationary sensor 15, and the sensor 1 5 would employ a frequency to voltage converter, providing an electrical output voltage which varies in magnitude according to the load on the shaft 12. The sensing means constituting by the gauge 1 4 and the non-contacting sensor 1 5- and the oscillator if employed-can be embodied as small components easily accommodated in the casing of the unit 10.
The control device 1 6 may take the form of a microprocessor which receives from the sensor 1 5 a voltage varying in dependence on the torque transmitted through the shaft 12. The device 16 compares the input voltage with one or more predetermined values and activates the device 1 3 in a regulated manner if the input voltage exceeds the value or values. The device 1 6 can also be pre-set to conform with the prevailing conditions.
It is preferable to arrange for the device 1 3 to be activated in a regulated progressive manner to avoid any sudden disconnection between the shaft 12 and the gear train in the event of overloading.
The system can cycle in a controlled manner so that the shaft 12 is disengaged from the gear train, and reengaged after a certain time, and disengaged again if the overload condition is still present.

Claims (14)

Claims
1. A method of protecting a drive unit for mining equipment against overloads; said method comprising continuously monitoring the dynamic load in a transmission component of the drive unit and actuating a coupling device in dependence on the monitoring operation to disengage the drive in the event of overloading.
2. A method according to claim 1 , wherein the monitoring operation produces an electrical signal proportional to load.
3. A method according to claims 1 or 2, wherein the monitoring operation monitors torsion in a shaft.
4. A method according to claim 1, wherein the monitoring operation invoives a non-contacting sensor inductively coupled to a gauge on the component and producing an electrical signal proportion to load.
5. A method of protecting a drive unit against overloads substantially as described with reference to the accompanying drawing.
6. Apparatus for use in protecting a drive unit for mining equipment against overloads; said apparatus comprising sensing means for sensing the load in a transmission component of the drive unit and a coupling device which is actuated by the sensing means to disengage the drive in the event of overloading.
7. Apparatus according to claim 6, wherein the sensing means provides an electrical signal proportional to load in the component.
8. Apparatus according to claim 6, wherein the sensing means provides an electrical signal proportional to the torque in a shaft.
9. Apparatus according to claims 7 or 8, wherein the sensing means comprises a noncontacting sensor coupled to a measuring gauge on the component.
1 0. Apparatus according to claims 7 or 8, wherein the sensing means comprises a noncontacting sensor inductively coupled to a strain gauge on the component.
11. Apparatus according to claims 7 or 8, wherein the sensing means comprises a measuring gauge for varying the frequency of an oscillator on the component, and a separate sensor with a coil inductively coupled to the oscillator, and a frequency/voltage converter for providing the electrical signal proportional to load.
12. Apparatus according to any one of claims 6 to 11, wherein a control device serves to evaluate the signal from the sensing means and regulates the operation of the coupling device.
13. Apparatus according to any one of claims 6 to 12, wherein the coupling device is a multi-disc clutch operated by electromagnetic or hydraulic force.
14. Apparatus according to claim 12, wherein the coupling device is a multi-disc clutch operated by electromagnetic or hydraulic force, and the control device controls a solenoid valve to actuate the coupling device.
1 5. A drive unit for mining equipment incorporating apparatus according to any one of claims 6 to 14.
1 6. Apparatus for protecting a drive unit or a drive unit incorporating such apparatus substantially as described with reference to and as illustrated in the accompanying drawings.
GB8134151A 1980-11-15 1981-11-12 Improvements in overload protection for the drive of mining equipment Expired GB2088442B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803043237 DE3043237A1 (en) 1980-11-15 1980-11-15 METHOD AND DEVICE FOR OVERLOADING THE DRIVES OF UNDERGROUND EXTRACTION AND CONVEYOR DEVICES

Publications (2)

Publication Number Publication Date
GB2088442A true GB2088442A (en) 1982-06-09
GB2088442B GB2088442B (en) 1984-12-19

Family

ID=6116934

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8134151A Expired GB2088442B (en) 1980-11-15 1981-11-12 Improvements in overload protection for the drive of mining equipment

Country Status (2)

Country Link
DE (1) DE3043237A1 (en)
GB (1) GB2088442B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538490A1 (en) * 1982-12-24 1984-06-29 Gewerk Eisenhuette Westfalia MECHANISM FOR PROTECTING AGAINST OVERLOADS, IN PARTICULAR FOR THE TRAINING OF CHARCOAL PANS AND THE LIKE
FR2547886A1 (en) * 1983-06-10 1984-12-28 Gewerk Eisenhuette Westfalia OVERLOAD PROTECTION TRANSMISSION, IN PARTICULAR FOR DRIVING COAL PLANERS, SQUEEGEE CONVEYORS, OR THE LIKE
FR2548263A1 (en) * 1983-06-28 1985-01-04 Gewerk Eisenhuette Westfalia MECHANISM WITH OVERLOAD PROTECTION DEVICE, PARTICULARLY FOR DRIVING COAL PLANES AND THE LIKE
GB2161575A (en) * 1984-07-12 1986-01-15 Gewerk Eisenhuette Westfalia Gearing units wherein drive is disconnected on overload
US4614134A (en) * 1983-06-28 1986-09-30 Gewerkschaft Eisenhutte Westfalia Overload protection system for planetary gear drive
DE3820264A1 (en) * 1987-06-17 1989-01-05 Voest Alpine Ag DRIVE ARRANGEMENT FOR THE SCREWING HEADS OR ROLLERS OF A DRIVING OR RECOVERY MACHINE
US5513902A (en) * 1993-05-19 1996-05-07 Westfalia Becorit Industrietechnik Gmbh Driving system for driving flexible elongate members, such as chains or scraper-chain assemblies, in mineral mining installations and method of operating
CN103104257A (en) * 2013-01-31 2013-05-15 三一重型装备有限公司 Coal mining machine and travel unit overload protective device thereof
EP2868922A1 (en) * 2013-10-30 2015-05-06 Brevini Power Transmission S.p.A. Reduction unit with torque limiter, particularly for orienting nacelles of wind turbines

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3331039C2 (en) * 1983-08-29 1995-01-19 Dorstener Maschf Ag Branching gear with built-in clutch
DE4021302A1 (en) * 1990-07-04 1992-01-16 Atlas Copco Eickhoff Road Cutting and loading machine - has load sensing on conveyor with control of cutting speed to prevent overloading

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2141304A1 (en) * 1971-08-18 1973-02-22 Gewerk Eisenhuette Westfalia SAFETY CLUTCH FOR DRIVE, IN PARTICULAR CHAIN-HOLLOW EXTRACTION OR CONVEYOR MACHINES IN SUBSIDIARY MINING
DE2521315C3 (en) * 1975-05-13 1978-11-02 Gewerkschaft Eisenhuette Westfalia, 4670 Luenen Hydraulic overload clutch, especially for conveyor and planer drives and the like
DE2634918C2 (en) * 1976-08-03 1984-05-03 Bergwerksverband Gmbh, 4300 Essen Overload clutch, in particular for coal plow drives
DE2749865A1 (en) * 1977-11-08 1979-05-10 Gewerk Eisenhuette Westfalia Shearing pin inserter for transporter sprocket - has manual tool for rapid alignment of rims for insertion

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538490A1 (en) * 1982-12-24 1984-06-29 Gewerk Eisenhuette Westfalia MECHANISM FOR PROTECTING AGAINST OVERLOADS, IN PARTICULAR FOR THE TRAINING OF CHARCOAL PANS AND THE LIKE
US4682678A (en) * 1982-12-24 1987-07-28 Gewerkschaft Eisenhutte Westfalia Gearing units for use with mining equipment
FR2547886A1 (en) * 1983-06-10 1984-12-28 Gewerk Eisenhuette Westfalia OVERLOAD PROTECTION TRANSMISSION, IN PARTICULAR FOR DRIVING COAL PLANERS, SQUEEGEE CONVEYORS, OR THE LIKE
FR2548263A1 (en) * 1983-06-28 1985-01-04 Gewerk Eisenhuette Westfalia MECHANISM WITH OVERLOAD PROTECTION DEVICE, PARTICULARLY FOR DRIVING COAL PLANES AND THE LIKE
US4601218A (en) * 1983-06-28 1986-07-22 Gewerkschaft Eisenhutte Westfalia Gearing units for use with mining apparatus
US4614134A (en) * 1983-06-28 1986-09-30 Gewerkschaft Eisenhutte Westfalia Overload protection system for planetary gear drive
US4667790A (en) * 1984-07-12 1987-05-26 Gewerkschaft Eisenhutte Westfalia Gearing units
GB2161575A (en) * 1984-07-12 1986-01-15 Gewerk Eisenhuette Westfalia Gearing units wherein drive is disconnected on overload
DE3820264A1 (en) * 1987-06-17 1989-01-05 Voest Alpine Ag DRIVE ARRANGEMENT FOR THE SCREWING HEADS OR ROLLERS OF A DRIVING OR RECOVERY MACHINE
US5513902A (en) * 1993-05-19 1996-05-07 Westfalia Becorit Industrietechnik Gmbh Driving system for driving flexible elongate members, such as chains or scraper-chain assemblies, in mineral mining installations and method of operating
CN103104257A (en) * 2013-01-31 2013-05-15 三一重型装备有限公司 Coal mining machine and travel unit overload protective device thereof
CN103104257B (en) * 2013-01-31 2015-06-10 三一重型装备有限公司 Coal mining machine and travel unit overload protective device thereof
EP2868922A1 (en) * 2013-10-30 2015-05-06 Brevini Power Transmission S.p.A. Reduction unit with torque limiter, particularly for orienting nacelles of wind turbines
WO2015063088A1 (en) * 2013-10-30 2015-05-07 Brevini Power Transmission Spa Reduction unit with torque limiter, particularly for orienting nacelles of wind turbines

Also Published As

Publication number Publication date
DE3043237C2 (en) 1989-04-27
DE3043237A1 (en) 1982-07-01
GB2088442B (en) 1984-12-19

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19931112