DE1458677A1 - Hydraulic device for the automatic control of movement processes in the case of moving hydraulic support frames, which are used in particular to support mines - Google Patents

Description

Patent application PH 58 677.7
ffairey Engineering Limited

description

Hydraulic device for the automatic control of movements supply processes in particular to support ■ Pit rooms serving, moving hydraulic support frames.

Addition to patent .... (patent application P 16 08 4-95.0

The subject of the invention is a further training or terbeasing of the hydraulic device for automatic Control: of movement processes in particular for support of pits serving, moving hydraulic support frames according to patent .... (patent application P T6 08 4-95.0), at the working cylinder which carries out the movement processes is adjustable one after the other via an adjusting device Y-valve device: to be supplied with hydraulic fluid

Documentation Crt. 7 § 1 Aba. Ζ Mr. t Sate S of the Alteration Lake. v. 4. % 1M7 |.

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The device according to the main patent is a semi-automatic control system and is of this type according to the main patent designed that the working cylinders for each movement a valve is assigned and for successive actuation of the valves a common hydraulic valve for all valves Adjusting device is arranged with an adjusting member which is moved exclusively as a function of time and which is used to actuate the respective Valve covers a time-determined path of movement and after the time necessary for this path of movement has elapsed Actuation of the next valve can be moved further automatically. There are two electro-hydraulic sequential control units each of which is programmed to initiate three or more operations in sequence, certain of which Operations represent a reversal of other operations. Furthermore, a reversing device is provided to each reverse an operation of three operations each. The two sequential control units are operated one after the other, by either a full cycle of forward motion or a full backward movement cycle of a support frame to be carried out with two frames connected by a feed ram. Each forward or backward motion cycle each Support frame must be initiated in that a special control device on a central switchboard with the. Hand operated.

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Through the additional invention, the device according to the main patent is to be further developed or improved in such a way that that it forms a simple, fully automatic hydraulic control system, which is capable of successively performing the forward movement steps a support frame to initiate and control, it is not necessary to have an automatically controlled bring about reverse movement step of the complete support frame. In addition, according to the additional invention the use of electrically operated parts avoided in the control device and these are designed so that they are exclusively works with hydraulic energy.

To solve this problem, the additional invention consists in that each hydraulic device with a hydraulic pole control device is equipped, which can be actuated with the aid of a hydraulic control pressure and when actuated the actuation of the hydraulic motors of the device concerned initiates in the correct order, and that the sequential control devices of the successive hydraulic Devices connected in the manner of a cascade connection to the control pressure source, the connections in the Are designed so that the termination of the working cycle of each ^ Umsteueinrichtung automatically causes the control pressure the sequence control device assigned to the next device is fed to the actuation of this device initiate.

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The support frames can be connected to each other in pairs to form a pair of support frames forms a separate support unit, the pole control device each support frame is designed so that the support ram of the support frame in question is lowered and at the same time then be lifted or extended again at the same time. After the end of this work cycle, the automatic control unit operates a hydraulic valve to supply the control pressure to the control unit of an adjacent support frame and so on initiate a forward movement step on this support frame.

When the automatic control device according to the invention is put into action, it thus executes a rolling cycle of successive forward movement steps, wherein the various support frames of the support units are advanced one after the other without the step-by-step movement each support frame or each unit formed by two coupled support frames to be controlled by hand needs.

The pole control device of each support frame may include a hydraulic ram and at least one series of hydraulic rams Servo valves include, along the line of action of the tappet piston are spaced and arranged so that they

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can be actuated one after the other by the plunger piston while it executes its axial stroke when the plunger is actuated by the control pressure; here the hydraulic servo valves serve the support ram and the feed ram to operate in the desired order.

For example, two parallel rows of hydraulic servo valves arranged in pairs can be provided, the two valves of each pair are arranged so that they are operated simultaneously by the plunger, and that the valve pairs are operated one after the other while the tappet piston executes its axial stroke.

The hydraulic system from which the control pressure for actuating the oil control devices is taken is preferably completely separated from the hydraulic system by means of which the support rams and the feed rams are operated. Through this it is ensured that there is no risk of pressure in a hydraulic ram or the rams of a Unit builds up and the correct operation of the control system interferes in such a way that a faulty function of another Aggregate is effected.

Furthermore, means are preferably provided which allow the stamps of each frame, if necessary, with the Manually operated so that each support unit can be operated independently if

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gig can be controlled by hand from the other units.

Further details and advantages of the invention emerge from the following description of an exemplary embodiment on the basis of the drawings. In the drawing show:

Fig. 1 shows schematically in plan a set of support units comprising two support frames the associated hydraulic connections j

Fig. 2 in a schematic representation of the hydraulic Circuit of a support frame of one of the support units according to FIG. 1, with the associated hydraulic Sequencer is shown;

Fig. 3 is a vertical section along the line III-III 4 by the foil control device of a Frame;

4 shows the sequence control device according to FIG. 3 in one horizontal section along the line IV-IV of Fig. 3J

Fig. 5 is a section along the line V-V of Fig. 4i

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6 and 7 sections along the lines VI-YI and VII-VH in FIG. 3.

In the illustrated embodiment, the invention is comprised of a set of two support frames Ceiling support units 1OA, 1OB etc. to 1OK used. According to 1, each support frame 11 or 12 has two upright hydraulic support rams which can be actuated at the same time 13A and 13B, and each such pair of support frames 11 and 12 is a horizontally arranged feed ram Assigned to H. According to FIG. 2, the units are connected in a cascade connection to a hydraulic control pressure system 15, which is separate from the main hydraulic pressure system 16, 17, by means of which the support ram and the feed ram of each unit are actuated. Each support frame 11 or 12 is with an automatic sequential control unit 20 equipped, its Details from FIGS. 3 to 7 emerge. According to FIG. 2, each sequence control device comprises a hydraulic tappet 21, the housing 22 of which is connected by clamps to the bracket 23 of the relevant support frame, and its piston or piston rod 24 six normally closed hydraulic filler valves 25A, 25B, 26A, 26B, 27A and 27B in the desired order. The valve actuating rod carries at its free end 24 a rotatably mounted U-shaped component 28 '(Fig. 3) which has two legs which at their ends through

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a bolt 29 is articulated to the rod 24. On the bracket portion of the connecting plate 28 are with the help of a Bolt 31 mounted two coaxial cam rollers 30 separated by a distance. The component 28 can pivot movements run around the axis of rotation of the bolt 29, which is transverse to the longitudinal axis the piston rod 24 extends to the cam rollers 30 between a retracted position in refugee with the piston rod 24 and at a distance from the poppet valves 25A to 27B and one in 3 ig. 3 to pivot operating position shown in which latter the cam rollers protrude outwardly opposite one side of the piston rod 24, around the poppet valves 25A to 27B to be operated in pairs while the piston rod 24 is extended. During the subsequent retraction of the piston length 24 the plate 28 with the cam rollers 30 is pivoted back into its retracted position, so that the cam rollers 30 the poppet valves Do not operate 25A to 27B while the piston rod 24 is moving backward.

The poppet valves 25A to 27B of the sequence controller 20 are arranged in pairs in two rows running next to one another, with the two poppet valves of each pair next to one another arranged on opposite sides of the piston rod 24 and the three pairs of valves in the direction of movement of the piston rod are distributed at intervals. The two valve plates of each pair of valves are actuated simultaneously by the two cam rollers 30.

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Tigt when the piston rod 24 is advanced, and they close again at the same time after the Noekenrolle 30 have released the valve disc. Each poppet valve is with a pivotable actuating member 32, which is mounted on a transverse axis 33, and a ramp surface 34 has, on which the associated cam roller 30 can act. Furthermore, an actuating surface is on each actuating member 32

35 provided at the adjacent end of the poppet valve stem

36 can attack in order to open the poppet valve against a leather 37. that normally keeps the valve closed. According to I ¹ Ig. 7 are those associated with the Dellervalves 26A and 26B. pivotable actuating members 32 are arranged on a common axis 33. Furthermore, four of the axles 33 for the valve actuating members, on which five of the members 32 are mounted, are provided with extensions 38 which extend through the valve housing as shown in FIG a key can be inserted to open the five poppet valves 25A, 25B, 26A, 26B and 27A by hand. The four heads 40 provided with the hexagonal indentations are arranged in chambers which are normally closed by a pivoting door 41. The sixth poppet valve 27B, by means of which the servo pressure of the control system 15 is regulated, is not provided with an extension 38 and an actuating head 40.

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The two first opposing control valves 25A and 25B, ie the valves closest to the tappet 21 of the sequential control device, are partially hydraulically balanced, and when they are opened simultaneously by the hocking rollers 30, they connect the housings of the two support tappets 13A and 13B of the relevant frame 11, for example via lines 42 and 43 with a Kleder pressure return line 17, which leads to the container of the hydraulic main system, as shown schematically in Fig. 2, so that the two support rams 13A and 13B are retracted. The second pair of poppet valves 26A and 26B, which are also partially hydraulically balanced, are connected by lines 44 and 45 to the two ends of the common gate push ram 14, which is assigned to the support frame 11 and the associated support frame 12 of the same unit. ¥ ewa these valves are opened at the same time that the plunger piston rod 24 is advanced further, the valve 26A connects one end of the feed ram 14 with the hydraulic pressure valve 16 of the main system, while the other valve 26B connects the other end of the feed ram 14 via the line 43 the return line 17 connects, so that the feed ram 14 is actuated to move the support frame 11 by one step forward. Of the third pair of poppet valves, valve 27A is a partially balanced valve which, when opened as the piston rod 24 continues to move, relieves the main system hydraulic pressure from the

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Line 16 from via line 47 and a check valve 48 can get to the lines 42 and 43, which lead to the ceiling support rams 13A and 13B to extend these rams again, after the forward movement of the support frame 11 is terminated by the closing of the two valves 26A and 26B of the second pair has been. The other valve 27B is an unbalanced poppet valve that controls the servo or control pressure of the tax system in the manner described below.

The hydraulic oil control valve 21 is an unbalanced one hydraulic tappet, the smaller or annular end of which has the smaller effective piston area, the hydraulic pressure of the main system is constantly supplied via an extension 49 of the pressure line 16, during which the Full diameter end of the control pressure can be supplied via a line 50, which connects to the control pressure line 15 is connected, which from the preceding support frame or from a control pressure system via a manually operated Valve goes out, and turned into an adjustable umbilical valve is. When the control pressure from line 15 from the Larger diameter end of the control plunger 21 is supplied, the pressure is overcome by the main system from via the line 49 is applied to the other end of the control plunger, so that the piston rod 24 begins to move out of the Push the cylinder out. The extension speed of the piston

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Rod 24 is controlled by the adjustable needle valve 51. When the sixth divider valve 27B by the piston rod 24- am Is opened at the end of its extension stroke, this valve releases the pressure of the control system from line 15 to an in Pig. 2 with 15 '' 'designated line arrive from the support frame 11 goes out and e.g. to the foil control device 20 of the next adjacent support frame 12 leads, so that the actuation the sequence control device 20 of the support frame 12 is initiated in order to move one step at this support frame perform. However, the supply of the control pressure via line 15 to the sequential control device 20 of the previously operated Support frame 11 is not interrupted by the opening of the sixth valve 27B, so that ^ the piston rod 24 of the control unit remains at the end of its forward stroke and does not begin to under the action of the pressure prevailing in the main system withdraw again as long as the pressure in the control system remains in effect. It should also be noted that the piston rod 24 when she is at the end of her forward stroke, holding the poppet valves 27A and 27B of the third pair open so that the pressure of the control system continues to have the larger diameter end of the control plunger 21 via the line 50 and the Throttle 51 can be supplied, being the pressure of the main system the front support ram 13A and the rear support ram 13B via the lines 47 and 42. A Pressure loss in the support rams 13A and 13B is caused by the

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Check valve 48 prevents this also from an interaction makes impossible between the support stamps.

The operation of the control system should be apparent from the description above. If according to Mg. 1 a Manual control valve 60 on the central control panel, not shown here is opened to the control pressure via the line 15 to the larger diameter end of the sequence control plunger 21 of the first frame 11 of the first support unit 10A comprising two frames within the set or the Feeding the row, "this single operation causes the automatic Control system comes into operation and a full cycle of successive incremental forward movements the support frames 11 and 12 of the units 10A to 1ON brings about until all aggregates of the group have moved forward, ending the sequence of stepping movements each support frame automatically to trigger the control device 20 of the next adjacent support structure leads is then also moved forward. The control tappets 21 of the support frames 11 and 12 remain fully extended until the last aggregate 1OH at the end of its advancement step of the full cycle has ended, whereupon the closing of the manual control valve 60 causes the control pressure is locked against all support frames; then a second valve 61 is opened to connect the control line 15-15 * to connect the container, so that the control plunger 21 retracted

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to be ready for another work cycle. on A four-way manual selector valve can be provided on the control panel which includes the two valves 60 and 61 for initiating and terminating the entire step movement cycle.

It is possible to interrupt the working cycle at any desired point, simply by closing the manual control valve 60 without the control pressure line being connected to the container via the other valve 61. If, however, this valve were opened at a moment in which one of the poppet valves of a support frame is held in its open position, namely by manual actuation of the head 40, this could prevent further proper functioning of the system or lead to errors in the sequence control to lead. To avoid the risk of this happening, the follower control circuit for the support frames is equipped with another manually operated valve 62 which is a rotatable valve coupled to the hinged door 41 which connects the hexagonal holes of the heads 40 of the pivot axes 33 covered. When the door 41 is opened, this movement causes the rotatable valve 62 to be automatically opened to connect the further end of the control plunger 21 via a line 63 to the median pressure return line 17 of the main system, the control pressure via a line 64 to diverted to the line 15 'leading to the next frame

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will. TJm the control plunger 21 against accidental manual actuation during an interrupted and unfinished automatic To secure the work cycle, the rotatable valve 62 thus ensures that manual actuation after opening the door 41 is only possible is possible if the support frame in question is completely bypassed and compared to the pressure in the line 16 of the automatic Control system is locked so that the control unit 20 is automatically reset to ready for manual operation to be. Thus, an operator can control the cycle of operation Interrupt a group of support units, isolate a faulty unit, end the work cycle of the remaining units and calmly fix the faulty unit.

To secure against the build-up of pressure in the ceiling support rams 13A and 13B of the individual support frames To create their load, a pressure relief valve 65 is connected to each of the pressure lines 42 leading to the two support rams a support frame leads. If the pressure relief valve is opened by an excessively high pressure in the line 42, the excessively high pressure can result Relieve the pressure through the pressure relief valve in the direction of the return line 17.

It should be noted that with the help of the fully automatic according to the invention hydraulic control system of a single operator is possible, two groups of 20 support units each

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from a central point to control, with the "two Groups of support units are arranged on both sides of the control panel, therefore it is possible for only three operators to control all support units in front of a longwall, with groups of 20 connected in series Aggregates are used. However, under certain circumstances it is also possible to further subdivide the groups of aggregates. This enables the support frames to be operated in such a way that, on average, a period of time is required for a forward movement 7 sec is required.

When it is desired, when moving the support units forwards each group to adhere to an order from right to left or from left to right, you can use the hydraulic Lines 15 »15 ', 16 and 17> which the adjacent frames 11 and 12 and the adjacent units 10A, 10B, etc. connect with one another, provided in duplicate, and equip them with suitable non-return valves, so that an actuation and control from one end or the other is possible without changing the direction of the workflow.

The system described above does not provide for the control of the punches for advancing the conveyor. This one The stamps must be pressurized one after the other in order to achieve the

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Conveyor device pushing the gate, the respectively extended support units 13A and 13B as absorbing the thrust force Abutments are used, you can control the stepping cycle of the support units and the Yorschubstempel for coordinate the conveyor system with one another if necessary.

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Claims (10)

Expectations 1. Automatic device for the automatic control of movement processes in particular for supporting Hydraulic support frames that serve to excavate the pit, in which the working cylinders that carry out the movement processes one after the other via a valve device that can be automatically adjusted by an adjusting device with hydraulic fluid is supplied, characterized in that each hydraulic door direction with an automatic hydraulic oil control device is equipped, which can be actuated with the aid of a hydraulic control pressure and is designed and when actuated, the actuation of the hydraulic motors of the device assigned to it in the correct order initiates, and that the JOlcontrolereinrichtungen the one another The following hydraulic devices are connected to the control pressure source in the manner of a cascade circuit, wherein the connections are designed in such a way that each sequential control device automatically terminates the work cycle, that the control pressure is supplied to the sol control device assigned to the next following device in order to actuate initiate this device. ' 2. Device according to claim 1 with support frames, each of which has two or more hydraulic support rams and a hydraulic Vorsehubstempel that connects between . _19th see the support frame and brazen "adjacent support frame" forms, characterized in that each support frame is provided with a separate hydraulically operated automatic sequence control device is equipped, which is designed so that it can be operated with the aid of a hydraulic control pressure, and then, when actuated, causes the support rams to be lowered first, followed by the actuation of the feed ram is to advance the support frame with respect to the adjacent support frame by one step, whereupon the support ram be extended or raised again and finally a hydraulic control valve is actuated to increase the control pressure the sequence control device of an adjacent support frame feed and initiate its actuation, the sequence control devices of the successive support frames in the form of a cascade connection to the source for the control pressure are connected, so that the completion of the work cycle of the sequential control device 3 of the support frame at the end of a stepwise forward movement of the relevant support frame automatically causes the control pressure of the sequence control device of the next following support frame is supplied to initiate its work cycle and to cause the next following Support frame carries out a step-by-step forward movement. - 20 - 809809/0857 3. Device according to claim 2 with a hydraulic main pressure system which is attached to the support stamp and the advance stamp Each support frame is connected so that the stamp is operated under the controlling influence of the lOlgesteuhtereinriehtungen can be characterized by a hydraulic control pressure system separate from the main system, with which the following Your devices are connected in 3? form of a cascade circuit so that they can be activated one after the other. 4. Device according to claim 2 or 3, in which each support frame has a front and a rear upright support ram which are mechanically connected to one another by a cap, and the support frames are connected to one another in pairs so as to be displaceable, with each support frame pair being assigned a common preheating ram which the sliding relative movement of the support frames of the pair is controlled, and each support frame pair forms a separate support unit, characterized in that the pole control device of each support frame is designed so that the support rams of the respective support frame are simultaneously lowered and then simultaneously raised again. 5. Device according to claim 2 to 4, characterized in that the SOlgesteueinrichtung each support frame one hydraulic tappets and at least one leg of hydraulic - 21 809809/0857 Servovalves includes, along the line of action of the piston rod of the plunger are spaced apart and arranged so that they are successively passed through the piston rod of the plunger can be actuated when the piston rod is at its axial Stroke executes what happens when the control pressure is supplied to the ram, the hydraulic servo valves serving to control the successive work steps of the support ram and the feed ram to be selected. , 6. Device according to claim 5y, characterized in that that each sol control device comprises two parallel rows of servo valves arranged in pairs, the two valves each pair are arranged so that they can be operated simultaneously by the piston rod of the plunger, and wherein the pairs of valves are operated one after the other * when the piston rod of the plunger executes its stroke. 7. Device according to claim 2 to 6, characterized by-means to the ram of each support frame independently of each other and from Hen other support frames with. to be operated by hand ' 8. Device according to claim 7, characterized in that the manual actuation means comprise a device M ^ um with the hand of each S ^ a ^ raveaitil or: the S «xwv @ ntile each ®aarÖ 'be * i ^: ' a .Falg ^ stemea ^ inuiohtung unaM ^ ngig. from the andei ^ ön sec * v # ^ - ■ - ■ valves of the control unit open and close « - 22 - 9. Device according to claim 8, characterized in that each valve control device has automatic hydraulic bypass valve means includes, which serve to shut off the pole control device from the control pressure system and the Control pressure system via the sequence control device of the next To connect the frame, the locked pole control device is bypassed, and that a Yerriegelungseinrichtung to secure is provided, by means of which the bypass valve is automatically brought into effect before the manual actuation means become accessible. 10. Device according to claim 9> characterized in that the manual control means of a movable in hinges lür be covered, and that the bypass valve so with the £ ür is coupled that it is automatically brought into effect when the door is opened. The patent attorney B 4 No. 120 Όβ ß 45 PAO) 809809/0857