US3293521A - Driving and control gear for coal ploughs and other mining machines - Google Patents

Driving and control gear for coal ploughs and other mining machines Download PDF

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Publication number
US3293521A
US3293521A US346385A US34638564A US3293521A US 3293521 A US3293521 A US 3293521A US 346385 A US346385 A US 346385A US 34638564 A US34638564 A US 34638564A US 3293521 A US3293521 A US 3293521A
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Prior art keywords
switches
switch
machine
pair
plough
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Expired - Lifetime
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US346385A
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English (en)
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Jan L J Van Vroonhoven
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Stamicarbon BV
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Stamicarbon BV
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    • 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
    • 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

Definitions

  • the present invention relates to an operating and safety device for a reciprocating winning machine in a mine and, more particularly, to a machine of this type, e.g. a coal plough which is hauled to and fro along the coal face of a normally slightly inclined seam in a coal mine.
  • a machine of this type e.g. a coal plough which is hauled to and fro along the coal face of a normally slightly inclined seam in a coal mine.
  • a switch is fitted at each end of the face worked by the machine, these switches being operated when the machine passes by.
  • An operator starts the plough and then only has a checking function as the plough travels up and down automatically.
  • a drawback of the known arrangements has been the risk of the plough being started in the wrong direction when it has reached the end of its travel and is stopped there.
  • A11 object of the invention is to provide means to start the plough in the proper direction when a command is given after the plough has stopped at one of the ends of its travel due to power failure or at the command of the operator.
  • Ancillary to the preceding object it is a further object of the invention to prevent automatic re-start of the plough after is has been stopped due to a power failure.
  • An additional object is to provide means whereby the operator may choose the direction in which the plough starts.
  • FIGURE 1 is a block diagram illustrating the basic operation of a reciprocating winning machine as employed with the operating and safety device of the invention.
  • FIGURE 2 is a schematic diagram of the control circuit of the invention.
  • the invention is characterized by two switches that are fitted at each end of the face worked by the machine and which are operated successively when the machine passes by.
  • switches Associated with these switches are two memories, operable between two states, that are brought to, or maintained, in one state by the switches which, as viewed from the middle of the travel, are first operated. The remaining switches each belong to separate memories to bring, or maintain them in the other state.
  • Control means are connected with the memories, which means serve to reverse the direction of travel of the machine automatically at the ends of the face to be ploughed and which permit the machine to travel towards the other end only, when the machine has been stopped non-automatically at one of the extreme ends of the face.
  • the switches may be of various types and controlled in different ways. Use might for instance be made of photoelectric cells and a beam of light interrupted by the plough. A very suitable embodiment has been found by mounting switches within glass, protected against damage in a fixed position, and operating them by means of a magnet fitted on the plough. Various types of memories may also be employed.
  • the device is characterized by retardation means in the control means for starting.
  • retardation means in the control means for starting.
  • the plough is automatically reversed it is then possible to stop it with certainty at the extreme end of the face to be ploughed.
  • a retardation of l to 2 seconds suffices.
  • adjustable retardation means for automatically stopping the plough at the ends of the face. With these means the plough can be made to run to the end, independently of the positioning of the last switch. It will be sufficient if this time can be adjusted between 01 second.
  • the memories are independent of the main supply voltage, that is to say that the information remains stored ifthe main supply voltage is interrupted.
  • the memories consist of polar relays with two stable positions, it is not difficult to make the circuit satisfy this condition.
  • FIGURE 1 of the drawings KS is a coal plough which moves up and down along sections X, Y, and Z of a coal face. At the transition areas between adjacent sections the plough meets and operates switches a, b, c, and d.
  • the switches c and d are positioned near the upper end, the so-called supply end, of the face.
  • the switches a and b are located near the lower end thereof, the so-called delivery end.
  • the reciprocating line along which the plough moves up and down has been drawn as separate lines.
  • the switches are connected to two memories GI and GII.
  • FIGURE 2 illustrates the control means by which these and other operations are realized.
  • seven sections are set forth. These include: a main section 7, a control section 1, a memory section 2, a transmission section 3, two retardation sections 4 and 5, and a transmission section 6.
  • Parts indicated in the main section are fuses V, an earth-fault relay A, two electrohydraulic valves EH and EH for switching on the hydraulic motors of the plough, and two pilot lamps L.
  • resistances are indicated by R, condensers by C, rectifiers by g, transistors by T, and potentiometers by Ri.
  • control section 1 there are two pressbuttons Op (for up) and Nr (for down) and a stopping switch Sp. Relays O, S, and N (indicated by squares) have been incorporated in the circuits of these buttons and switches. These relays, as well as others to be hereinafter described, are bridged by a capacitor and resistor in series to limit high currents when the relays are opened and closed.
  • contacts of relays will be indicated by the sections in which they are incorporated. In the drawing these contacts are indicated by the letter of the relay.
  • the contacts of relay 0 in the sections 1, 2, 4 and 5 are indicated by O and in the following explanation of the operation by O1, O2, 0-4 and O5.
  • each memory has a contact in series with a transmission relay I or II (shown as squares).
  • condenser connections provide for the retardation. If the changeover contacts I and II are in the position shown in the drawing, the retardation time is e.g.
  • Relays U of section 4 and D of section have respective contacts in the transmission section 6, by means of which relays UO, or OD, may be selectively energized to excit the electrohydraulic relays EH or EH respectively.
  • the plough is stationary in section Y (FIG. 1) the two memories GI and GII (section 2) are switched on and the contacts GL3 and GII-3 are open, as indicated in FIGURE 2.
  • switch Sp Before starting, switch Sp must be closed.
  • button Op is now pressed, relay 0 is excited. As a result the contacts 0-1, 0-2 and 0-4 are closed and contact 0-5 is changed over.
  • Relay S of section 1 is then excited causing contact S1 to be closed, S4 to be changed over and S5 to be changed over.
  • the plough operates switch 0.
  • This switch closes and opens, but, as the memory relays GI and GII receive an impulse passing through the same winding as the impulse last received through switch a, this impulse produces no effect on the polar relays.
  • switch d closes and opens.
  • memory GI assumes the other position and contact GI-S closes.
  • Relay I is thereby excited and its contacts asssume the following positions: Ilt open, I2 closed, I4 changed over, I5 closed.
  • the change over of I5 permits relay D to be excited after a 2 second delay which causes the relay OD, and then the valve EH to be excited.
  • the plough accordingly starts moving down.
  • the plough passing switch d in the down direction produces no effect.
  • memory G1 is again out in.
  • section Y the plough can be started in both directions. Thus, if the plough hits on hard coal, it is possible to move the plough a few times up and down along any given length of face.
  • relay 8 drops out and opens contact S-l. Consequentb the plough cannot start moving of its own accord after power has been restored, even if switch Sp is closed. It is necessary again to operate press-button Op or N)".
  • the device according to the invention is very reliable and economically attractive, raises safety considerably, and is very simple to operate.
  • a device for driving and controlling coal ploughs and other mining machines reciprocally movable between the ends of a coal face of a mine comprising:
  • said first switch of each pair of switches also being connected to the memories such that as the machine moves past the first switch from a position intermediate the first and second ones of a switch pair toward a position intermediate the first switches of each pair, the said memory is returned to its first state;
  • control means connected to said memories, said control means including means for directing the movement of said machine, the directing means being responsive to the states of said memories for automatically reversing the movement of the machine at the ends of the face, said control means further including means for partially interrupting the operation of said directing means when the machine is nonautomatically stopped at an end of the face whereby said machine is permitted to travel only toward the opposite end of the face.
  • a device further comprising References Cited by the Examiner retardation means for delaying the starting of said ma- UNITED STATES PATENTS chine, said means being connected in the circuit between the memories and the control means.
  • g g 3 A device according to claim 1, further comprising 5 I 11/1959 g 1 318 282 retardation means for automatically stopping said ma- 2922O53 1/1960 Ste 61 318:282 Chme at i face" 3,129,369 4/1964 Littwin 318-282 4.

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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)
  • Control Of Position Or Direction (AREA)
  • Fluid-Pressure Circuits (AREA)
US346385A 1963-02-19 1964-02-18 Driving and control gear for coal ploughs and other mining machines Expired - Lifetime US3293521A (en)

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NL289204 1963-02-19

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BE (1) BE643985A (es)
GB (1) GB990457A (es)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3407002A (en) * 1966-01-11 1968-10-22 Coal Industry Patents Ltd Remote control of mining machines
US3436598A (en) * 1967-07-17 1969-04-01 John L Guerrisi Control system safety relay
US3643147A (en) * 1969-02-21 1972-02-15 Nippon Steel Corp Shift-controlling device for shifted materials
US3677603A (en) * 1969-10-16 1972-07-18 Gullick Dobson Ltd Mine roof supports
US3825809A (en) * 1973-07-23 1974-07-23 Vemco Products Garage door power operator having partial open capability
US3826535A (en) * 1973-02-12 1974-07-30 Taiheiyo Coal Mining Co Ltd Coal planer automatic reversing device
US3962615A (en) * 1974-03-20 1976-06-08 Spangler Searle T Multiple mode variable speed motor control circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071176A (en) * 1935-03-11 1937-02-16 Gen Electric Machine tool control arrangement
US2726358A (en) * 1954-06-25 1955-12-06 George E Barnhart Portable electric motor power unit
US2913651A (en) * 1957-09-27 1959-11-17 Westinghouse Electric Corp Control system for a reversible motor
US2922053A (en) * 1957-09-10 1960-01-19 British Iron Steel Research Control systems
US3129369A (en) * 1960-07-05 1964-04-14 Arthur K Littwin Automatic motor reversing at limit fo travel by variable transformer means
US3213342A (en) * 1962-05-23 1965-10-19 Robert L Littwin Automatic motor reversal controlled by variable transformer means

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071176A (en) * 1935-03-11 1937-02-16 Gen Electric Machine tool control arrangement
US2726358A (en) * 1954-06-25 1955-12-06 George E Barnhart Portable electric motor power unit
US2922053A (en) * 1957-09-10 1960-01-19 British Iron Steel Research Control systems
US2913651A (en) * 1957-09-27 1959-11-17 Westinghouse Electric Corp Control system for a reversible motor
US3129369A (en) * 1960-07-05 1964-04-14 Arthur K Littwin Automatic motor reversing at limit fo travel by variable transformer means
US3213342A (en) * 1962-05-23 1965-10-19 Robert L Littwin Automatic motor reversal controlled by variable transformer means

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3407002A (en) * 1966-01-11 1968-10-22 Coal Industry Patents Ltd Remote control of mining machines
US3436598A (en) * 1967-07-17 1969-04-01 John L Guerrisi Control system safety relay
US3643147A (en) * 1969-02-21 1972-02-15 Nippon Steel Corp Shift-controlling device for shifted materials
US3677603A (en) * 1969-10-16 1972-07-18 Gullick Dobson Ltd Mine roof supports
US3826535A (en) * 1973-02-12 1974-07-30 Taiheiyo Coal Mining Co Ltd Coal planer automatic reversing device
US3825809A (en) * 1973-07-23 1974-07-23 Vemco Products Garage door power operator having partial open capability
US3962615A (en) * 1974-03-20 1976-06-08 Spangler Searle T Multiple mode variable speed motor control circuit

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GB990457A (en) 1965-04-28
BE643985A (es) 1964-08-18

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