GB1225807A - - Google Patents
Info
- Publication number
- GB1225807A GB1225807A GB1225807DA GB1225807A GB 1225807 A GB1225807 A GB 1225807A GB 1225807D A GB1225807D A GB 1225807DA GB 1225807 A GB1225807 A GB 1225807A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pump
- piston
- motor
- valve
- load current
- 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.)
- Expired
Links
- 230000015556 catabolic process Effects 0.000 abstract 2
- 239000012530 fluid Substances 0.000 abstract 2
- 238000005065 mining Methods 0.000 abstract 2
- 239000003245 coal Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C29/00—Propulsion of machines for slitting or completely freeing the mineral from the seam
- E21C29/04—Propulsion of machines for slitting or completely freeing the mineral from the seam by cable or chains
- E21C29/14—Propulsion of machines for slitting or completely freeing the mineral from the seam by cable or chains by haulage cable or chain pulling the machine along the working face
- E21C29/16—Winches or other means for pulling cable or chain
Landscapes
- 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)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
1,225,807. Mining apparatus. EICKHOFF MASCHINENFABRIK U. EISENGIESSEREI m.b.H. GEB. 12 June, 1968 [13 June, 1967], No. 27828/68. Heading E1F. [Also in Divisions F2 and H2] A hydraulic pump 2 associated with a hydraulically driven winch of a mining machine is controlled by a pump-setting device in dependence on the load current of an electric driving motor 1 of the machine, the control being such that when the load current exceeds a value close to but not exceeding that of the breakdown torque of the motor the pump is substantially instantaneously set to its idlingposition. The motor 1 drives a coal cutting tool, the pump 2, a servo pump 3 and a further pump 4. The pump 2 is in a working circuit including a motor 5 for the winch, and the pump 3 supplies a control circuit feeding liquid to the working circuit. The working pressure acts on a piston 16 of the pump-setting device, and a pilot valve 17 which can be manually actuated only when a spring-biased piston 18, thereof is under control pressure permits the control pressure to act on a piston 19 of the device to release a control sleeve 20 so that a piston 34 may be actuated. The pump 4 supplies pressure to a piston 23 of the device through an electromagnetically operated valve 22 controlled by the load current of the motor 1. A voltage proportional to the load current is produced by a transformer 24, a rectifier 25 and a resistor 26, and a nominal voltage is produced in a resistor combination 27 and is matched to the rated current of the motor 1 by resistors 28. The difference between the actual and nominal voltage is applied to transistor amplifiers 29, 30. The valve 22 is associated with coils 31, 41 selectively supplied with current from a rectifier 32 under the control of the transistor amplifiers 29, 30. In operation the coil 31 is energised to actuate the valve 22 so as to release the sleeve 20, and a spring 33 then adjusts the pump 2 through the piston 34 to an output position pre-set by a lever 35. When the motor current reaches the nominal value, i.e. there is no difference between the actual and nominal voltages, the transistor amplifier 30 opens a contact 37. The valve 22 is spring-returned to its central position, and the piston 23 is therefore locked hydraulically. When the actual voltage exceeds the nominal voltage the transistor amplifier 29 energises the coil 41 to actuate the valve 22 so as that the piston 23 sets the pump 2 to a smaller output. A transistor amplifier 42 which controls a electro-magnetically operated valve 48 is fed with the voltage difference and has a potentiometer 46 arranged so that the transistor amplifier responds to a voltage difference corresponding to the load current of the motor 1 which is close to but does not exceed the breakdown torque of the motor. Operation is such that if the machine suddenly moves into a solid heading at high speed, the valve 48 is operated to feed fluid from the control circuit to the piston 23 which substantially instantaneously sets the pump 2 to its idling position. Fluid from the working circuit may be passed by the valve 48 in place of that from the control circuit for operating the piston 23.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1533664 | 1967-06-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1225807A true GB1225807A (en) | 1971-03-24 |
Family
ID=5675678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1225807D Expired GB1225807A (en) | 1967-06-13 | 1968-06-12 |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1225807A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2475112A1 (en) * | 1980-02-02 | 1981-08-07 | Gewerk Eisenhuette Westfalia | FELLING DEVICE FOR DOWNHOLE MINING WITH FORWARD CONTROL REGULATION |
-
1968
- 1968-06-12 GB GB1225807D patent/GB1225807A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2475112A1 (en) * | 1980-02-02 | 1981-08-07 | Gewerk Eisenhuette Westfalia | FELLING DEVICE FOR DOWNHOLE MINING WITH FORWARD CONTROL REGULATION |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |