RU1811559C - Device for control of yielding prop of powered shield support - Google Patents

Abstract

Usage: when controlling the landing of racks of powered roof supports. SUMMARY OF THE INVENTION: A device for controlling landing of racks comprises a housing with several inputs. One of them is connected to the pressure in front of the hydraulic distributor for supplying the working fluid to the cavity of the hydraulic stand, a chamber in which the piston with the pusher is located with the possibility of movement, acting on the piston parts of the switching valve, loaded from both sides. This piston has various pressure surfaces. At the same pressure in the discharge chamber, it moves relative to the piston part, opening it and connecting the pump pipeline to the piston cavity of the strut. The discharge chamber of this piston must be connected via an additional control piston to an opening made in the wall of the housing. When the rack is removed, the overpressure behind the piston loaded on both sides can be reliably and simply reduced. In this case, the pressure decreases as much as necessary, so that the hydraulic fluid always remains in the system, and the additional valve, accordingly, can quickly and quickly switch in a short time. 4 C.p. f-ls, 5 ill.

Description

The invention relates to a device for controlling the landing of a mechanized shield support strut, which includes a housing with several inlets, one of which is connected to a pressure line in front of the hydraulic distributor for supplying working fluid to the cavity of the hydraulic stand, a chamber with a controlled piston with a plunger located in it, the piston cavity of which through an additional hydraulic element communicated with the input for connection to the piston cavity of the rack, and the pusher is installed with the possibility of interaction with a movable lock th element of the switching valve.

Therefore, the invention is based on the task of creating a fast and reliable turning-on, easy-to-install and small-sized device for controlling the landing of the rack,

The object of the invention is solved in that the switching valve is provided with a second movable locking element, that both locking elements are tapered and are pressed against the sealing surfaces of the housing, which are located at opposite ends of the valve, by means of a coil spring, and that the additional hydraulic element is made in the form of a pressure limiting valve with pruel eating o

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a genre and a sealing piston, the spring chamber of which is connected to the cavity of the spring chamber and that the diameter of the end face of the piston located in it located on the side of the piston cavity is larger than the diameter of the end located on the side of the piston cavity, the housing on the side of the piston cavity being made with an opening in communication with the piston cavity and is equipped with a control piston installed in this hole, which is movably located in the discharge chamber and has an end face connected to the closure part ited and an opposite end surface, the diameter of one of the ends (end surfaces) is greater than the diameter of the other end.

With this kind of device, they completely (completely) abandoned the additional switching parts outside the device. The entire switching process proceeds automatically and depending on the pressure, so that intervention (assistance) of the miners is not necessary. The sealing on the two sides of the piston of the switching valve ensures that, in accordance with the direction of flow, the partition (seal) of the pressure (pump) line becomes active. moreover, this seal in the direction of the pump line is still supported by increasing load pressure in the system, i.e. in a kreggie stance, and goes up.

Thereby, a quick-switching device has been created which is predominantly small in size and which can thereby be placed everywhere, namely, mainly without switching elements located outside the housing. This compact device is particularly well suited precisely because of the completely dependent on the pressure of the switching paths (methods) for underground, yet hard work. The dual action of the changeover valve is optimized, in particular, in that it is designed as a spring-loaded change-over valve, the coil spring being clamped between two section pistons. The force of the coil spring ensures that when there is no more flow in the system, the dividing piston is firmly pressed against the sealing surface so that the device is actively connected opposite the pressure line.

This is true, in particular, when the screw spring is proportional to the flow pressure. Since it is located between both locking

elements, it acts, respectively, preferably, while it opens the locking elements. If there is increased pressure in the support column, then this

rack pressure maintains the strength of the coil spring and ensures that the increased pressure cannot be exerted in the direction of the pressure line and pump. When viewed together

With this double-acting valve or a switching valve, the unit that optimally quickly and reliably switches is integrated in such a device that, with minimal adjustment costs, ensures an excellent operating mode.

. Additional holes or extensions in the area of the piston parts according to the invention were discarded, since they were made

neny in the form of flattened on both sides,

conical on one side of the piston. Both parts of the piston, as already mentioned, are unclenched by means of a coil spring and are held with their sealing surfaces for 5 times on the sealing surfaces of the holes or are removed from these sealing surfaces due to hydraulic pressure or pressure in the system, depending on

0 pressure ratios in the system. With the removal of the corresponding part of the piston from the sealing surface, simplifications become effective so that the hydraulic medium can flow along the parts of the piston.

The sensitive switching valve circuit according to the invention is optimized in that the piston parts of the double-acting valve are made

0 relevant. At the same time, it is advantageous to be able to replace these pistons, so that fewer varieties of spare parts are achieved, and especially reduced manufacturing costs.

The reduced manufacturing costs and spare parts in particular should also be noted due to the fact that the piston parts of the switching valve, the sealing

0 the piston of the pressure limiting valve and the locking part of the control piston are interchangeable. At the same time, early and correct operation of the parts was achieved.

5 piston depending on the position in the system, namely, with a correspondingly equal increase in pressure or a corresponding change in pressure.

The mounting stand is installed by triggering the main control

block, i.e. is provided with a hydraulic medium, and during this installation process, approximately 30 bar is present in the system. So that the necessary and desired installation pressure also really exists before the complete installation of the lining, and a pressure limiter is introduced into the additional valve. According to the invention, the spring of the pressure-limiting valve can be preliminarily clamped by the set screw moving in the housing, so that the pressure-limiting valve can accordingly be continuously adjusted. At an operating pressure of about 30 bar, it is advisable to set the pressure-limiting valve to 80 bar. An additional valve is then activated by this pressure limiting valve, which is provided so that the piston surface of the mounting post remains connected to the pump tubing.

Advantageously, the additional valve operates automatically and without further external adjustment, for which the piston, which affects the piston part, is, for its part, controlled by the control piston in relation to when pressure control is caused by this control piston, which allows reciprocating movement of the piston. To this end, the control piston is placed in the respective discharge chamber with the possibility of loading on both sides, the opposite pressure locking part being larger than the surface corresponding to the locking part. These various pressure surfaces are provided so that this control piston is respectively in a position which is provided by the corresponding stroke and which once makes it possible to connect the corresponding pressure chamber to the atmosphere and once such connection is interrupted.

A particularly compact design of the auxiliary valve is formed when the inlets to the loading pipelines are located on the side, the inlet to the pump from the end of the housing. At the same time, it turns out that not only favorable placement of the entire additional valve in the lining is possible, but also a desirable construction requiring little space.

The invention is characterized in particular in that an additional valve is created which has optimal dimensions and which switches easily, quickly and reliably depending on the task, and the surface of the piston of the fastening column must be reliably connected to the pump pipeline. For this, the main control unit is practically not needed, so. that more than 5 is not dependent on the thoroughness of the operating personnel, since the corresponding pressure is automatically adjusted or controlled by an additional valve.

0 Fig. 1 shows a simplified diagram of additional control; figure 2 is an additional valve, side view; in Fig.3 is an end view of a part of the valve; Fig. A is a view of a superun additional valve; in Figs. 5-5, an end view of the additional valve, partially shown with a section in Figs. 1 and 2. The additional device 1 serves to connect the hydraulic stand 2 regardless of the location and layout of the hydraulic distributor 3 with the pressure line 4 of the pump before as long as the lining must show its support force (see figure 1). For this piston cavity 6, it is connected to the pressure line 4 via an additional device 1.

If the hydraulic stand 2 is to be removed, then the annular surface 7 of the hydraulic stand 2 is connected to the discharge pipe 5, and the hydraulic medium can be drained through the hydraulic distributor 3.

Piston and annular cavity 6, 7 designate both chambers inside the cylinder, which are separated by a piston 8.

Overpressure in the system cancels the pressure limiting valve 3, which is included in the pipeline 10 and discharges the hydraulic medium if the set value is exceeded. Thanks to this, for example, unexpected hits and

0 an increase in pressure in the system due to a rock shock or similar extreme load in that a hydraulic fluid is discharged in a certain amount through the pressure limiting valve 9.

5Number 11 indicates the pipeline that is necessary so that the descent or removal of the hydraulic stand 2 can take place actively due to the fact that the hydraulic medium is supplied to the annular

0 of surface 7. This is due to setting the position to extract 13 in the control valve 3, while the filling position is indicated by 12.

5 The optional device 1 shown in FIG. 1 as a circled box is explained in detail by other figures. The auxiliary device 1 has a housing 15 with several inlets, channels and pressure chambers, in which individual controls or valves are located, taking care of the smooth operation of the additional valve.

16 indicates a pump inlet, i.e. a pump line not shown in detail is connected here. In the corresponding hole is a switching valve 17, consisting of shut-off elements 18, 19; between which the coil spring 20 is clamped so that it presses both piston locking elements 18, 19 against the sealing surfaces 21, 22 if the hydraulic medium in the system has come to rest. If the piston locking elements 18, 19 are opposite loaded with hydraulic fluid or other influences and extended from the sealing surface 21, 22, then the hydraulic fluid can be introduced into the system along the seals 23, 24. The end view of FIG. 3 explains the location and execution seals 23, 24 both on the locking elements 18, 19 of the piston, and on other pistons identically located in the system.

In the zone of entry to the piston cavity b, a pressure limiting valve 26 is located. In the spring chamber 27 of the pressure limiting valve 26 there is a spring 28 which rests, firstly, on the set screw 29. and, secondly, on the spring disc 30 and takes care of so that the sealing piston 31 is pressed into the sealing surface 32, so that it provides sealing and sealing until the spring pressure, set smoothly by actuating the set screw 29, exceeds the pressure of the hydraulic medium at the inlet to the piston cavity 6.

33 denotes a channel in the area of the set screw 29, through which hydraulic fluid can also be supplied behind the piston 36, which can be moved in the valve cavity 35.

The cavity 35 and the spring chamber 27 are connected to each other, so that when the sealing piston 31 is opened, the hydraulic fluid flows through the spring chamber 27 also into the valve chamber 35 on both sides of the piston 36. Based on the ratios of the surfaces of the piston, the end face of the piston 36 then acts its pusher 37 on the locking element 19 and squeezes it out of the sealing surface 22.

As already mentioned, the piston 36 is made in the form of a double-acting piston, and the pressure end face 38 is selected to be larger than the pressure end face 42, so that when the pressures in the pressure chamber 39 are equalized, the piston 36

always moves in the direction of the locking element 19. The pusher 37 is guided 40 so that the warping is avoided. The 0-shaped rings 41, as well as 43 and 44, provide separation of the pressure chambers or isolation from the atmosphere. The threaded plug 45 facilitates mounting since the corresponding parts can be removed from the corresponding hole or cavity 39 after unscrewing the threaded plug 45.

Numbers 46, 46, and 46 indicate threaded pins, which may cause the individual connecting channels in the housing or be closed.

FIG. 4 shows a top view of an additional valve 1 according to FIG. 2. The inlets 47 to the piston cavity 6 and the inlet 48 to the annular cavity 7, as well as the inlet 16 of the pump, are arranged so that a compact design of the auxiliary device 1 is obtained.

The partial cross-sectional view shown here shows the position and placement of the control piston 50, which is located in the respective discharge chamber 51 on the side of the openings containing the switching valve 17 and the pressure limiting valve 26. Thanks to the locking part 52, which presses on

5, the sealing surface 61 due to the fact that the piston surface 53 is smaller than the opposing piston surface 54, it is achieved that the hydraulic medium flows out of the area of the piston cavity 39

0 injection into the atmosphere. The 0-shaped ring 55 isolates both partial zones of the pressure chamber 39 from each other, the 0-shaped ring 56 seals the threaded plug 57, so that when the locking part 52 is displaced

5 hydraulic medium through hole 59 in. the inner wall 58 of the housing may briefly go outside. If pressure then increases again, the locking part 52 automatically, subsequently, outside the larger piston surface 54 is again pushed onto the sealing surface 61 and thereby isolates the system again.

5 shows an end view, wherein

5 it can be seen that the individual inlets on the housing 15 can be reached through the screw couplings 60, so that the connection of the corresponding pipes 10,11 is facilitated. Fig. 5 also shows the arrangement of the various openings in which the valve 17, the pressure limiting valve 26 and the control piston 50 are arranged for movement of the switches.

When installing support in the face, i.e. of the pillar 2, the main control unit 3 is shifted to the filling position 12. The hydraulic medium flows from the pipeline 4 of the pump when opening the check valve 63 into the pipeline 10 and from there into the cylinder chamber bounded by the piston cavity 6.

Since the conduit 10 is also simultaneously connected by an inlet 47 to an additional device, there is the same pressure there. As long as the piston 8 and the stand extend with it, the pressure reaches about 30 bar. Since the spring 28, for example, only comes into action at 80 bar. option device 1 remains inactive during this phase. If the rack pressure reaches 80 bar, then through the inlet 47 the hydraulic medium moves the sealing piston 31 against the spring force of the spring 28, so that then the hydraulic medium flows into the spring chamber 27 under a pressure of about 80 bar.

Through the channel 33, this hydraulic medium then enters the cavity of the pressure piston 39 behind the piston 36 and moves it with its pusher 37 towards the locking element 19.

The locking element 19 then moves against a slightly adjusted coil spring 20. Since the pressure in the pump acts on the locking element 18 through the pump inlet 16, it is also lifted from the sealing surface 21, so that the hydraulic medium can flow into the additional device 1 within the pressure range pump. Both the spring chamber 27 and the valve chamber 35 of the cavity of the pressure piston 39 are filled with hydraulic fluid within the pump. Then, a long-term connection of the cavity of the piston 6 with the pipeline 4 of the pump is provided, bypassing the control valve. Also, when a part of the main control unit equipped with a safety circuit is not connected to the fastener place for a long time, the hydraulic stand 2 receives, thanks to the additional device 1. the necessary pressure,

When loading the hydraulic stand 2, the pressure in the system rises, i.e., in the valve chamber 35, in the cavity of the piston 39 and in the spring chamber 27, so that in addition to the open shut-off element 19, the hydraulic medium can act on the shut-off element

18 and it is additionally pressed against the sealing surface 21.

At the same time, it is absolutely guaranteed that the transfer of excess pressure to the pump piping cannot occur before the pump. Rather, the load pressure or the pressure in the rack increases the spring force of the coil spring 20, which # otherwise automatically works if there is no more flow in this zone .. Also, therefore, then the internal area of the auxiliary device 1 is closed automatically relative to the pipeline 4.

5 By selecting the dimensions of the pressure surface 37 and 42, it is ensured that even when faults occur, part 8 of the piston always remains in the open position, so that the hydraulic medium can flow through

0 pump inlet 16 is always in the direction of the pipe 10, i.e. in the direction of the piston cavity 6.

If the hydraulic stand 2 must be removed, then the control valve 3 is included in

5, support position 13. Then, the annular surface 7 is automatically loaded through the pipe 11, so that the hydraulic medium from the cylinder space behind the piston surface 6 can be passed through the pipe 10 in the direction of the return pipe 5. The non-return valve opens through the control pipe 64 connected by the pipe 11,

5, the hydraulic fluid may accordingly leak.

Since the conduit 11 is simultaneously connected also to the additional device 1, there is a correspondingly high pressure at the inlet 48, as in the region of the annular surface 7. It acts so that the piston 36 is pushed by the pusher 37 back to its original position.

Then the locking element 19 screw

5, the spring 20 moves all the way into the sealing surface 22. The hydraulic medium through the pump inlet 16 can no longer penetrate into the system. The reverse movement of the piston 36 with the pusher body 37 is possible only because the pressure in the chamber 51 is momentarily increased so that the locking part 52 momentarily rises or moves from the sealing surface 61. Thanks

5, the hole 59 in the wall 58 of the housing is connected and the hydraulic medium can exit until the piston 36 is returned to its original position. The various piston surfaces 53 and 54 of the control piston 50 are then again acted upon.

that it again automatically returns to the sealing position and the locking portion 52 rests snugly against the sealing surface 61. The hole 59 is then closed again.

All parts of the auxiliary valve 1 are again in the initial position, and the entire process of adjustment and switching proceeds again as soon as the main control unit 3 is turned back on in the installation position of the lining.

Claims (5)

SUMMARY OF THE INVENTION 1. A device for controlling the landing of a mechanized shield support strut, comprising a housing with several inlets, one of which is connected to the pressure line in front of the directional valve for supplying working fluid to the hydraulic stand cavity, a chamber with a controlled piston with a plunger, a piston cavity placed in it which through an additional hydraulic element is in communication with the input for connecting to the piston cavity of the rack, and the pusher is installed with the possibility of interaction with the movable locking element ntom switching valve, characterized in that, in order to increase reliability, - a switching valve is provided with a second movable locking element, the two locking elements You are a full taper and by a cylindrical helical spring pressed against the seal formed in the housing yuschim surfaces disposed in protivog the positive ends of the valve, an additional hydraulic element is made in the form of a pressure limiting valve with a spring and a sealing piston, a spring chamber 5 of which is connected to the rod cavity of the chamber, and the diameter of the end face of the piston located in it located on the side of the piston cavity is larger than the diameter of the end which is located on the side of the rod cavity 10, the housing on the side of the piston cavity being made with an opening that is in communication with the piston cavity, and equipped with a control piston located in this hole, the diameter of one of 15 ends of which are larger than the diameter of the other end. 2. Device pop. 1, characterized in that the locking cones are made with opposite parts of the smoothed 20. 3. The device according to claim 1, wherein the locking cones have the same structural dimensions to simplify manufacture. 25 4. The device according to claim 1, wherein the locking cones, the sealing piston of the pressure limiting valve and the locking part of the piston are made with the same dimensions for easier replacement and to reduce storage in the warehouse 30. 5. The device according to claim 1. Incidentally, a set screw is interfaced with the spring of the pressure limiting valve to set the desired torque. Fig. / figure 5