SU797601A3 - Hydraulic device for control of displaceable support sections in mines - Google Patents

Abstract

1381303 Advancing mine roof support circuits GEWERKSCHAFT EISENHUTTE WESTFALIA 4 Aug 1971 [4 Aug 1970 (2) 10 Oct 1970] 36708/71 Heading E1P [Also in Divisions Fl and F2] A hydraulic control system comprises valve devices actuable to control a hydraulic path therethrough, pressure medium conduits for connecting said valve devices between a number of consumer appliances and pressure medium supply and return lines whereby pressure medium can be fed to. or from one or. more of said appliances and via one of the valve devices when the latter is selectively actuated, a manually operable control device for actuating a selected valve device, further pressure medium conduits for connecting the control devices to the valve devices, at least some. of the valve devices each having two servopistons, each servo-piston having in turn its own associated working chamber, and the servo-pistons being adapted to. actuate the valve device when pressure medium is conveyed to the associated working chamber, one of the chambers of each of said devices being operably connected through one of the further conduits to said control device and the other of the chambers being operably and selectively connected to part of the system adapted to effect an automatic control sequence on said appliance. The control system of the invention is preferably applied to a mine roof support system comprising a series of assemblies each having four props 60, 60A actuated by a ram 62 connected to a conveyor, the props 60 being the forward props and the props 60A the rear props. The control valve, see Heading F2V, is depicted herein as having operating positions I..VII and is connected to a pressure conduit P and a return line R via a branch line P', R' respectively: The props 60 and the props 60A each have a common double-acting servo-control valve such as 63 with servopistons 63', 63" adapted to control the extension of the props under manual or automatic control respectively; robbing of the props being controlled by a valve 69 having servopistons 69', 69" which to-gether with pressurerelief valves 65, 65A are connected in the circuit as shown. The ram 62 is controlled by double-acting servo-control valves 73, 79 having servo-pistons 73', 73", 79', 79"; a relief valve 77 and a regulator 83 being arranged in the circuit for the ram as depicted. The regulator 83 controls a valve 85 connected in turn to a control conduit ST and to a reversing valve 86 incorporating a timing mechanism 88. In position III the props 60, 60A are extended and the ram 62 blocked off from the return line R to hold the conveyor fixed. In positions II and IV the ram 62 is extended to advance the conveyor and the props are robbed respectively, whilst, in position V the props are robbed and the ram 62 retracted to move the props up to the conveyor. In position I the rear props 60A are set against the roof independently of the front props 60 and in position VI the front props are likewise set independently of the rear props; simultaneous setting of all the props being effected in position VII. The assembly disclosed may be successively operated in association with other assemblies for detailed automatic control of which the Specification should be referred to. For modified arrangements in which the control arrangement involves a mine roof support assembly with two relatively movable frames and an installation in which the shifting rams for a group of assemblies are operated simultaneously Figs. 2 and 3 respectively (not shown), should be referred to.

Description

one

The invention relates to the fixing of clearing faces with mechanized supports that are manually operated in combination with automatic controls.

It is known a device / in which for the combined control of a dispensing valve two servo-pistons are provided, connected to separate control lines. The locking elements of the device are made conical 1.

It is also known a device for controlling movable support sections, equipped with manual and automatic control, including a selective servo-control device, consisting of a spool with sealing bushings No. 1И mounted in its end surface, mixed on a flat surface of a mirror with connecting holes, distribution valves with shut-off valves. elements, imekhtsimi two servoports each with cameras connected to separate control lines, and remote element 2.

The disadvantage of these devices lies in the lack of sealing by the closure elements used in them and their low life span.

service.

The purpose of the invention is to improve the tightness and service life of the control valves of hydraulic devices.

This goal is achieved by the fact that the shut-off elements of the control valves are made of two balls, between which there is a remote element in contact with both balls.

FIG. 1 shows a selective device made as a rotary slide, a slit; in fig. 2-4 the same, combined in

0 control unit through distribution plate with distribution and operating valves of hydraulic control device; in fig. 5 and 6 - distribution valve with

5 two servo patterns.

The control device consists of a rotary slide valve having a body 1 with a flat surface, made in the form of a disk, which

0 at the same time forms the connecting And mounting plate. The disk with a flat surface is provided with connecting holes located along the joint pitch circle of the disk. In this case, twelve connecting holes are located along the pitch circle. The connecting holes are located on the surface 2 of the body 1, around the circumference of which the hole 3 is machined. An annular shoulder 4 is formed between the surface of the control mirror and the machined hole. The rotary valve body 5 is bolted to the body 1 in the rotary valve body 5. from a disk of circular section, which is inserted into the body of the plane, and sealed against the cylindrical inner wall of the body with the help of a sealing ring 7. The rotary valve body 6, on its side facing the body 1, has a central rotary axle 8 located, which extends into the central aperture 9 of the body with a flat surface and is sealed relative to the wall of the aperture using the sealing ring 10. The rotary axle 8 serves to center the rotary body spool, as well as simultaneously as a connecting member for the main pumping inlet 11, connected to the central connecting port 9. The pump return pipe 12 is connected to the ground A flat bore body 13 is also located outside the specified pitch circle of the connecting holes and eccentric on the flat surface body so that it fits into the annular slot 14 between the surface of the control mirror and the end surface of the rotary slide valve body. On the side opposite to the surface 2 of the control mirror, the rotary slide valve body 6 has a central, axial, cylindrical protrusion 15, which protrudes outward through the imechtses in the base of the bell body 5, and is sealed in the latter by means of o-rings 16 and 17. Axial protrusion 15 has a stepped axial inner bore 18, in which a pusher actuated return valve 19 is installed. The stop valve of the return valve consists of a valve ball 20, which in the closed position with is pressed by the spring 21 against the annular part 22 of the valve seat, which is axially bore under the axial inner bore. On the other hand, the valve sedpa’s body is adjacent

bushing. organ 23. The elements 22 to 23 are supported in their position by the locking member 24, which is screwed from the outside into the inner hole of the axial protrusion 15. In the central inner hole of the locking organ. 5, a pusher 25 is sealed, which has a finger 26 at the front end, and its rear end is under the influence of an eccentric lever 27, which is axially lined

o 15 can be rotated around the axis 28. When the eccentric lever is deflected, the pusher 25 acts inwards, with the result that the finger 25 lifts the ball 20 from the valve seat

5 valves against regenerating

spring force 21. Case 5 of the rotary slide valve on the base has an annular boring 29, which diameter is much larger than the diameter

0 pitch circle connecting holes. In this bore there is a roller bearing 30, on which the rotary slide valve body B is supported.

5o

The rotary slide valve body has an eccentrically drilled hole 31, in which the fixing ball 33 is under the influence of the spring 32. On the base of the body there are recesses 34 in which, under the influence of the spring 31, the ball 33 can engage in various positions

 -include. In addition, the rotary slide valve body 6 has a cut-off opening 35, which opens onto the face side of the rotary valve body turned to the control mirror 1 and which is connected through the radial hole 36

with axial bore 18 of the return valve. The radial bore 35 extends into the axial bore in the space between the two radially shaped flanges of the stub organ 23. The latter has grooves 37 that connect the bores 35, 36 and the bore 9 of the main pressure feed 11. The bores 35

The Qs are located along a pitch circle and the bushings 38 are oriented in them with the possibility of pozneneobrazny move, with the help of springs 39 they can be pressed against the surface 1 of the control mirror. The sleeves 38, on their outer end surfaces, have elastic annular seals 40, which circumferentially are coaxial holes in the seat 36, and are pressed to

0 over the surface of the control mirror, as a result, the connection between the coaxial holes is sealed (in relation to the ring-shaped

5 teli 14) ,. The connecting holes in the seat are connected to various distribution and operating valves and other consumers. When the check valve 19 is closed, the connection between the central square connecting port 9 and the connecting hole 41 of the seat is blocked. If the eccentric lever 27 is turned, the pusher 25 presses the valve ball 20 into the open position, so that a pump pressure supply 11 is connected through the holes 9,35-37 and 41. The pressure of the fluid acting on the back surface of the piston ring of the sleeve 33 presses the sleeve from its end face sealing 40 to the surface 1 of the control mirror, as a result of which the coaxial holes 35 and 41 are reliably sealed with respect to the annular gap 14. When the eccentric lever is reversed, the valve ball 20 again returns to the jerking, as a result, the communication between the holes 9 and 41 is interrupted. Now, the rotary valve body 6 is turned around its axis, which is performed by the eccentric lever 27 in the closed position. By rotating the rotary valve body b , in known combinations, to connect with various connecting holes of the saddle. When switching the body of the rotary valve, the bushings 38 are not subjected to the pressure of the liquid, as a result of which no significant clamping and friction forces appear on the face seals 40. In various switching positions, the rotary-gold organ is removably fixed by the ball 33. The rotary slide valve is connected (Figures 2 and 3) with screws 42 to a distribution plate 43 equipped with holes 44 that connect holes 9 and 13 in a rotary slide valve seat with connecting pipes or a consumer, or distribution valve openings. In addition, the following are connected to the distribution plate:. with the help of the rotary slide valve, the working valves 45, as well as the servo-controlled distribution valves of the hydraulic support control devices, main pipelines 11 and 12. The whole unit design forms the control unit, which is located on the support section. A saddle with a flat surface 1 is provided (Fig. 4), for example, with six distribution holes 46 around its circumference, which are spaced from each other at equal angular distances x. Additionally, holes 47 are provided, the radial distance of which from the axis of the control device corresponds to the distance between the holes 35 of the switching element 48. The holes 47 are arranged offset from the holes 46 in such a way that by means of the switching element 48 it is possible to alternately block its hole 35 a functional hole 46 of the base plate or one of the holes of the base plate, in each of these positions of rotation of the switching element 48, which are indicated on the table Arudi scale and additionally can be equipped with sensitive markings, the functional hole 46 and 47 of the base plate is blocked only one of the holes 35 of the switching element 48; the other, which is not used in the respective switching position, is compacted with respect to the flat surface 1 of the base plate, so that the delivery medium cannot exit. FIG. 5 and 6, the valve body 49 is closed and sealed at one end by means of a locking screw 50, and the other end by means of a locking screw 51. Between the two locking screws 50 and 51 in the valve body are a distance sleeve 52, a valve seat body 53, and a distance sleeve 54, a valve seat body 55, a spacer sleeve 56 and a guide sleeve 57. These elements are fixed in the valve body by means of locking screws. The valve seat body 53 has a ball-shaped closing body 58, and the body 55 has a ball-shaped closing body 59. A pusher 60 is located between the two balls 58 and 59 and passes through the axial bore 61 of the spacer sleeve 54 and rests on its valve balls 58 and 59. In this case, the elements are arranged so that from both balls one is in the open position and the other is in the closed position. The valve ball 59 is guided to a spacer sleeve 56 provided with radial bores 62. Two control valve servos 63 and 64 are slidable in the guide sleeve 57 and sealed by means of o-rings with respect to the guide sleeve. The servo 65 and 66 and servo pistons 63 and 64, as well as both valve balls, are aligned with each other. Servo piston 63 has an internal opening in which a spring 67 is placed, pressing

a little effort plate 68 spring to the ball 59 of the valve. Marin 58 is supported by a pushbutton 69, which is disposed in a spring-loaded manner. at least 70 of the locking screw 50 and under the influence of the locking spring 71 located in the spring chamber. By the spring force, the valve balls 58 and 59 are kept in an adjacent position to the pusher 60 and parts 69 and 68.

The connecting hole 72 leading to the consumer (slide cylinder, hydraulic rack, etc.) through radial holes 73 in spacer sleeve 54 is connected to its axial hole. The connecting hole 74 is connected through the radial holes 76, in the guide sleeve 57 to the servo cylinder 65, and the connecting hole 75 is connected to the servo cylinder 66. Valve 58 closes the opening of the directional valve facing the pump, and valve 59 closes the opening facing the return wire. In normal operation, the valve 58 is closed, so that the connecting wire 72 connected to the consumer through the radial holes and the axial holes 61 and the open valve 59 is connected to the return wire 12 (Fig. 5). In this connection, the pump with the consumer is closed by means of valve 59. Under pressure, the corresponding servo piston (63 or 64) mixes, and it moves the tight kinematic connection of both valve balls 58 and 59 with the pusher 60 of the valve axially against the restoring force springs so that valve 59 closes and valve 58 opens. In order to prevent sudden opening and closing of the valves in the event of a switch, the pusher 60 has a profile shape, as a result of which at the beginning of the valve that is to be opened opens a small annular gap first, increasing with increasing stroke of the servo piston. in the event that control pressure in the servo piston stops, the valve 58 is closed by nudges 71, the valve 59 is opened, with the result that the consumer is connected to the outlet. Compressed by means of a closing spring 71, the pressing tool 69 has a groove

on the end surface for guiding and centering the valve ball 58 Since the valve ball is additionally directed in the spacer sleeve 52, it fits precisely to the valve seat. The pusher 60 with its upper ends is directed into the axial bores of the bodies 53 and 55 of the valve seat. For the direction and centers of the valve balls, both end surfaces of the pusher are made in the form of liners. The upper ends of the pusher, which are directed in the fitting holes of the valve seat bodies, are narrowed so as not to reduce the living cross section of the flow. Both servomotor 63 and 64 are guided, Slidable in guide sleeve 57. The individual parts are arranged so that the servo piston together with the spring, the valve balls and the pusher move together and do not lose contact with each other during switching.

Claims (2)

1. Bgshkov A.I. Coal mining equipment in England. M., NIIinformt Zhmash, shlp. 2-63-20, 1968 p. 127,129. 2.Avtsfskoe certificate of the USSR 359413, cl. E 21 D 23/16, 1969 (prototype). S9 71 5 Its