Liquid tank for hydraulic support and pilot-operated type stop valve of liquid tank

Abstract

The invention relates to a liquid tank for a hydraulic support and a pilot-operated type stop valve of the liquid tank. The pilot-operated type stop valve comprises a valve body, and a main liquid path and a pilot-operated control liquid path are arranged on the valve body; the main liquid path is provided with a main liquid inlet, a main liquid outlet and a bypass liquid return opening, and a main valve element assembly and a bypass valve element assembly are arranged on the main liquid path; the pilot control liquid path comprises a first pilot liquid path and a second pilot liquid path, an electromagnetic pilot valve assembly is arranged on the first pilot liquid path, and a manual hydraulic control pilot valve assembly is arranged on the second pilot liquid path; the main valve element assembly comprises a main valve element, a main reset spring is arranged between the main valve element and the valve body, a main pilot hydraulic control cavity is formed between the valve body and the main valve element, and a self-control flow channel is further formed in the main valve element. The manual hydraulic control pilot valve assembly comprises a pilot valve element, a manual driving structure is arranged on the valve body, a pilot reset spring is arranged between the pilot valve element and the valve body, and an auxiliary pilot hydraulic control cavity is formed between the pilot valve element and the manual driving structure. And pilot control liquid inlet stopping is achieved, action is rapid, and response is sensitive.

Description

Technical Field

[0001] The invention relates to the technical field of stop valves, and in particular to a liquid tank for a hydraulic support and a pilot stop valve thereof. Background Art

[0002] At present, when the hydraulic support system of the coal mining face in the coal mine returns the liquid, it is mostly returned to the box through the return liquid pipeline for recycling. In order to cut off the return liquid pipeline in daily maintenance or emergency situations, it is necessary to install a manual or electric ball valve type stop valve on the main return liquid pipeline for opening and closing control. When the hydraulic system of the coal mining face works normally, the main return liquid pipeline of the system should be kept unobstructed, and the manual or electric ball valve type stop valve should be kept open to ensure smooth return of liquid to the coal mining face; when the manual stop valve needs to be closed during maintenance, there are large closing torques, high labor intensity, easy misoperation or easy to forget to reset the open state in time after manual closing, etc., causing equipment damage or safety accidents.

[0003] When the electric ball valve type stop valve is installed on the main return liquid pipeline for use, it has slow closing and opening movements. In case of emergency, it cannot be opened and closed in time to quickly control the dynamic development of the incident. In addition, there is a situation in the mine where manual or electric ball valve type stop valves only control the opening and closing of the main return liquid pipeline, and no bypass return liquid is set. As a result, once the main return liquid is closed during online maintenance, the return liquid of the hydraulic support system of the underground coal mining working face is cut off, and the entire system cannot work normally and may even cause equipment damage or safety accidents. In addition, even if multiple sets of manual or electric ball valve type stop valves are added for bypass return liquid pipeline control, the manual or electric ball valve type stop valves cannot ensure the synchronous opening and closing of the main return liquid pipeline and the bypass return liquid pipeline, resulting in poor return liquid from the coal mining working face, leading to equipment damage or accidents.

[0004] The stop valve is a valve device that realizes the switch of the main and auxiliary pipeline systems of the hydraulic support. The stop valves currently used are mainly two-channel valves that use a handle to drive the rotating shaft or an electromagnetic control valve core to open and close to realize the on-off control of the liquid flow channel. They only have the function of controlling the on-off of the liquid between the upstream and downstream of the hydraulic pipeline system; and during use, due to the high pressure in the pipeline system, the shaft becomes difficult to rotate, cannot rotate, or even grinds to death. At the same time, when the stop valve cuts off the upstream liquid inflow of the hydraulic pipeline system, the downstream hydraulic pipeline system it controls still has high pressure, which is prone to sudden spraying during disassembly, posing a safety hazard. Summary of the invention

[0005] The purpose of the present invention is to provide a pilot stop valve to solve the problems in the prior art of using a single manual or electric stop valve to control the main circuit, resulting in slow opening and closing of the stop valve, high labor intensity in operation, and poor return of liquid due to asynchronous return of liquid; the purpose of the present invention is also to provide a liquid tank for a hydraulic support using the pilot stop valve.

[0006] In order to solve the above problems, the pilot stop valve involved in the present invention adopts the following technical solutions: The pilot-operated stop valve comprises a valve body, on which a main fluid circuit and a pilot control fluid circuit are arranged; The main liquid circuit has a main liquid inlet, a main liquid outlet and a bypass liquid return port respectively connected to the main liquid inlet, a main valve core assembly is provided at the main liquid circuit corresponding to the main liquid outlet, and a bypass valve core assembly is provided at the bypass liquid return port; The pilot control fluid circuit comprises a first pilot fluid circuit and a second pilot fluid circuit, the first pilot fluid circuit is provided with an electromagnetic pilot valve assembly, and the second pilot fluid circuit is provided with a manual hydraulically controlled pilot valve assembly; The main valve core assembly includes a main valve core that reciprocates to block the main liquid path, a main reset spring is provided between the main valve core and the valve body, a main pilot hydraulic control chamber is provided between the valve body and the main valve core on the side facing away from the main liquid path, the main pilot hydraulic control chamber is communicated with the second pilot hydraulic path, and a self-control flow channel that passes through the main liquid path and the main pilot control chamber is also provided on the main valve core, and the blocking cross-sectional area of ​​the side of the main valve core close to the main liquid path is smaller than the blocking cross-sectional area of ​​the side close to the main pilot hydraulic control chamber; The manual hydraulically controlled pilot valve assembly includes a pilot valve core movably arranged on a second pilot fluid circuit, and a manual driving structure is also provided on the valve body. The manual driving structure is used to cooperate with the pilot valve core, and a pilot return spring is provided between the pilot valve core and the valve body, and an auxiliary pilot fluid control chamber is provided between the pilot valve core and the manual driving structure; the auxiliary pilot fluid control chamber is connected to the first pilot fluid circuit to drive the pilot valve core to block the second pilot fluid circuit after liquid is introduced into the auxiliary pilot fluid control chamber.

[0007] In a preferred embodiment, the second hydraulic control pipeline is further provided with a float pilot valve assembly for blocking the second pilot fluid circuit driven by a rising liquid level.

[0008] In a preferred embodiment, the float pilot valve assembly includes an articulated rod rotatably suspended on the valve body, the end of the articulated rod is connected to a float, the head end of the articulated rod is abutted against a pilot valve stem for blocking the second pilot line, the action of the float drives the articulated rod to rotate, and then drives the pilot valve stem to block the second pilot fluid line and open the second pilot fluid line.

[0009] In a preferred embodiment, the valve body is provided with a main valve installation cavity, and the main valve installation cavity is connected with the main liquid inlet and the main liquid outlet, and the main valve core assembly includes a valve sleeve sealed and fixed in the main valve installation cavity, the bottom of the valve sleeve forms a valve inlet hole connected with the main liquid inlet, and the side wall of the valve sleeve has a valve outlet hole connected with the main liquid outlet, the main valve core guide is assembled in the valve sleeve, and cooperates with the bottom side wall of the valve sleeve to seal the main liquid pipeline, and the main end plug is sealed above the valve core in the main valve installation cavity, and the main reset spring is installed between the main end plug and the main valve core, and the valve sleeve is provided with a main connecting hole connecting the second pilot liquid circuit and the main pilot liquid control cavity.

[0010] In a preferred embodiment, the manual hydraulically controlled pilot valve assembly includes a manual hydraulically controlled pilot installation cavity arranged in the valve body, the manual hydraulically controlled pilot installation cavity is connected with the first pilot fluid circuit and the second pilot fluid circuit, the manual hydraulically controlled pilot valve assembly includes a valve housing sealed and assembled in the manual hydraulically controlled pilot installation cavity, the pilot valve core guide is assembled in the valve housing, the pilot return spring is top-mounted between the valve housing and the pilot valve core, a pilot connecting hole connecting the first pilot fluid circuit and the pilot hydraulic control cavity is provided on the side wall of the valve housing, a threaded hole is also provided on the valve housing, the axis of the threaded hole is consistent with the axis of the pilot valve core, the manual drive structure includes a valve stem threadedly assembled in the threaded hole, and a handwheel is connected to the top of the valve stem.

[0011] In a preferred embodiment, the height of the main liquid inlet is lower than the height of the main liquid outlet, the height of the main liquid outlet is lower than the height of the bypass liquid return port, a bypass return valve installation cavity is provided on the valve body, the bypass valve core assembly includes a bypass valve core movably assembled in the bypass return valve installation cavity, the bypass valve core is opened by being pushed upward by the liquid below, the bottom of the bypass valve core has a sealing end face that is sealed with the main liquid path, a accommodating cavity is provided on the top of the bypass valve core, the top of the bypass valve core is open, a screw plug is provided above the bypass valve core, and a liquid control hole that passes through the accommodating cavity and the bypass liquid return port is provided on the side wall of the bypass valve core, the liquid control hole is for reflux liquid to enter the accommodating cavity to drive the bypass valve core downward to block the main liquid path.

[0012] In a preferred embodiment, a pilot filter structure and a one-way valve are also provided on the first pilot liquid circuit.

[0013] In a preferred embodiment, the valve body is a valve block structure composed of a plurality of channels, the main liquid inlet is arranged on one side of the valve block, the main liquid outlet and the bypass liquid return port are arranged on the other side of the valve block, and the main valve core assembly, bypass valve core assembly, solenoid pilot valve assembly and manual hydraulic pilot valve assembly are arranged on the top of the valve block.

[0014] In a preferred embodiment, a sealing plate for mounting on a side wall of the liquid tank body is provided on one side of the valve block, and the sealing plate is sealingly assembled with the valve block.

[0015] The hydraulic support liquid tank involved in the present invention adopts the following technical solutions: A liquid tank for a hydraulic support, comprising a liquid tank body, a liquid discharge port being provided on one side of the liquid tank body, a pilot stop valve being provided on the side wall of the liquid tank body, the pilot stop valve comprising a valve body, a main liquid path and a pilot control liquid path being arranged on the valve body; The main liquid circuit has a main liquid inlet, a main liquid outlet and a bypass liquid return port respectively connected to the main liquid inlet, a main valve core assembly is provided at the main liquid circuit corresponding to the main liquid outlet, and a bypass valve core assembly is provided at the bypass liquid return port; The pilot control fluid circuit comprises a first pilot fluid circuit and a second pilot fluid circuit, the first pilot fluid circuit is provided with an electromagnetic pilot valve assembly, and the second pilot fluid circuit is provided with a manual hydraulically controlled pilot valve assembly; The main valve core assembly includes a main valve core that reciprocates to block the main liquid path, a main reset spring is provided between the main valve core and the valve body, a main pilot hydraulic control chamber is provided between the valve body and the main valve core on the side facing away from the main liquid path, the main pilot hydraulic control chamber is communicated with the second pilot hydraulic path, and a self-control flow channel that passes through the main liquid path and the main pilot control chamber is also provided on the main valve core, and the blocking cross-sectional area of ​​the side of the main valve core close to the main liquid path is smaller than the blocking cross-sectional area of ​​the side close to the main pilot hydraulic control chamber; The manual hydraulically controlled pilot valve assembly includes a pilot valve core movably arranged on a second pilot fluid circuit, and a manual driving structure is also provided on the valve body. The manual driving structure is used to cooperate with the pilot valve core, and a pilot return spring is provided between the pilot valve core and the valve body, and an auxiliary pilot fluid control chamber is provided between the pilot valve core and the manual driving structure; the auxiliary pilot fluid control chamber is connected to the first pilot fluid circuit to drive the pilot valve core to block the second pilot fluid circuit after liquid is introduced into the auxiliary pilot fluid control chamber.

[0016] In a preferred embodiment, the second hydraulic control pipeline is further provided with a float pilot valve assembly for blocking the second pilot fluid circuit driven by a rising liquid level.

[0017] In a preferred embodiment, the float pilot valve assembly includes an articulated rod rotatably suspended on the valve body, the end of the articulated rod is connected to a float, the head end of the articulated rod is abutted against a pilot valve stem for blocking the second pilot fluid path and arranged in the second pilot fluid path, the action of the float drives the articulated rod to rotate, and then drives the pilot valve stem to block the second pilot fluid path and open the second pilot fluid path.

[0018] In a preferred embodiment, the valve body is provided with a main valve installation cavity, and the main valve installation cavity is connected with the main liquid inlet and the main liquid outlet, and the main valve core assembly includes a valve sleeve sealed and fixed in the main valve installation cavity, the bottom of the valve sleeve forms a valve inlet hole connected with the main liquid inlet, and the side wall of the valve sleeve has a valve outlet hole connected with the main liquid outlet, the main valve core guide is assembled in the valve sleeve, and cooperates with the bottom side wall of the valve sleeve to seal the main liquid pipeline, and the main end plug is sealed above the valve core in the main valve installation cavity, and the main reset spring is installed between the main end plug and the main valve core, and the valve sleeve is provided with a main connecting hole connecting the second pilot liquid circuit and the main pilot liquid control cavity.

[0019] In a preferred embodiment, the manual hydraulically controlled pilot valve assembly includes a manual hydraulically controlled pilot installation cavity arranged in the valve body, the manual hydraulically controlled pilot installation cavity is connected with the first pilot fluid circuit and the second pilot fluid circuit, the manual hydraulically controlled pilot valve assembly includes a valve housing sealed and assembled in the manual hydraulically controlled pilot installation cavity, the pilot valve core guide is assembled in the valve housing, the pilot return spring is top-mounted between the valve housing and the pilot valve core, a pilot connecting hole connecting the first pilot fluid circuit and the pilot hydraulic control cavity is provided on the side wall of the valve housing, a threaded hole is also provided on the valve housing, the axis of the threaded hole is consistent with the axis of the pilot valve core, the manual drive structure includes a valve stem threadedly assembled in the threaded hole, and a handwheel is connected to the top of the valve stem.

[0020] In a preferred embodiment, the height of the main liquid inlet is lower than the height of the main liquid outlet, the height of the main liquid outlet is lower than the height of the bypass liquid return port, a bypass return valve installation cavity is provided on the valve body, the bypass valve core assembly includes a bypass valve core movably assembled in the bypass return valve installation cavity, the bypass valve core is opened by being pushed upward by the liquid below, the bottom of the bypass valve core has a sealing end face that is sealed with the main liquid path, a accommodating cavity is provided on the top of the bypass valve core, the top of the bypass valve core is open, a screw plug is provided above the bypass valve core, and a liquid control hole that passes through the accommodating cavity and the bypass liquid return port is provided on the side wall of the bypass valve core, the liquid control hole is for the liquid that flows back in reverse to enter the accommodating cavity to drive the bypass valve core downward to block the main liquid path.

[0021] In a preferred embodiment, a pilot filter structure and a one-way valve are also provided on the first pilot liquid circuit.

[0022] In a preferred embodiment, the valve body is a valve block structure composed of a plurality of channels, the main liquid inlet is arranged on one side of the valve block, the main liquid outlet and the bypass liquid return port are arranged on the other side of the valve block, and the main valve core assembly, bypass valve core assembly, solenoid pilot valve assembly and manual hydraulic pilot valve assembly are arranged on the top of the valve block.

[0023] In a preferred embodiment, a sealing plate for mounting on a side wall of the liquid tank body is provided on one side of the valve block, and the sealing plate is sealingly assembled with the valve block.

[0024] As described above, the present invention has the following beneficial effects: compared with the prior art, the pilot stop valve designed by the present invention arranges a pilot control fluid circuit composed of a first pilot fluid circuit and a second pilot fluid circuit on the valve body, adopts two pilot control modes, electric control and manual control, to cut off the main fluid inlet of the emulsion, and at the same time, a bypass return fluid port is set, so that the main return fluid of the coal mining working face can be returned normally, and the normal operation of the hydraulic system of the coal mining working face is not affected; the combination of electromagnetic control and manual control is adopted, and the pilot control fluid inlet cut-off is performed through the pilot cavity, which has quick action and sensitive response, and solves the problem that the current manual or electric stop valves in the mine directly control the opening and closing of the main fluid circuit, resulting in slow opening and closing action, especially the manual stop valve has a large rotation torque and high operation labor intensity. In addition, the problem that the manual or electric stop valve on the main return liquid pipeline underground currently only controls the return liquid cutoff, and no bypass return liquid is set, resulting in the problem that once the main return liquid is cut off, the entire coal mining face hydraulic system will be shut down directly; in addition, the problem that multiple groups of manual or electric stop valves are set underground in time to control the return liquid cutoff and bypass return liquid, there is still a problem of the return liquid cutoff and bypass return liquid being out of sync.

[0025] Furthermore, the electromagnetic pilot valve assembly adopted in the present design first controls the opening and closing of the manual hydraulic pilot valve assembly, and then controls the opening and closing of the main valve core assembly through the manual hydraulic pilot valve assembly, so as to realize the main return liquid control of the coal mining working face, and the control is more precise; when the electromagnetic pilot valve assembly fails or the stop valve cannot be opened and closed, the manual hydraulic pilot valve assembly is timely controlled to open and close through the manual drive structure, and then the main valve core assembly is controlled to open and close, so as to realize the main return liquid opening and closing of the coal mining working face, and the overall operation process is more labor-saving and convenient, and solves the problems of large opening and closing torque of the manual stop valve, high labor intensity of workers, and inability to turn the handle or handwheel, resulting in the failure to open and close the manual stop valve in time during feeding, causing accidents; at the same time, in the case of power outage underground, the main return liquid opening and closing of the coal mining working face can still be manually controlled.

[0026] Two pilot valve assemblies arranged on the first pilot liquid circuit and the second pilot liquid circuit are used for sequential control. An automatic control flow channel is set on the main valve core of the main valve core and the size of the cross-sectional area is designed. In the process of emulsion flowing in the main liquid circuit, when the pilot valve controls the isolation of the pilot liquid circuit, the emulsion can flow from the automatic control flow channel into the main liquid control chamber through the cross-sectional setting of the valve core itself, so that the pressure difference formed by the difference in upper and lower cross-sectional areas prompts the main valve core to close automatically, ensuring that the main valve core is closed quickly and efficiently. At the same time, it can ensure the synchronous opening and closing of the bypass circuit and the main liquid circuit, avoid poor return of liquid, and ensure the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the drawings required for use in the embodiment: Figure 1 It is a schematic structural diagram of a specific embodiment of a liquid tank for a hydraulic support of the present invention; Figure 2 for Figure 1 Half-section of Figure 3 for Figure 2 Structural diagram of the medium pilot stop valve; Figure 4 for Figure 3 Half-section of Figure 5 for Figure 4 Middle BB section view; Figure 6 for Figure 4 Middle CC section view; Figure 7 for Figure 4 Middle DD section view; Figure 8 for Figure 3 A top view without the solenoid pilot valve assembly; Fig. 9 for Figure 8 A schematic cross-sectional view of the first pilot fluid path; Fig.10 for Figure 5 A schematic cross-sectional view of the main valve core assembly; Fig.11 for Figure 5 A schematic cross-sectional view of the middle bypass valve core assembly; Fig.12 for Figure 6 A schematic cross-sectional view of a manual hydraulic pilot valve assembly; Fig.13 for Figure 3 A cross-sectional diagram of the mid-float pilot valve assembly; Fig.14 for Figure 3 Perspective view of the main fluid path layout of the middle valve block; Fig.15 for Figure 3 Perspective view of the layout of the pilot control fluid circuit of the middle valve block.

[0029] Description of reference numerals: 1-valve block; 11-main liquid path; 111-main liquid inlet; 112-main liquid outlet; 113-bypass liquid return port; 114-first transverse channel; 115-main channel; 116-second transverse channel; 12-first pilot liquid circuit; 121-pilot liquid inlet; 122-first longitudinal channel; 123-first pilot transverse channel; 124-liquid discharge channel; 125-liquid control channel; 126-electromagnetic pilot liquid inlet; 127-electromagnetic pilot liquid discharge port; 128-electromagnetic pilot liquid control port; 13-second pilot fluid path; 131-second longitudinal channel; 132-second pilot transverse channel; 133-pilot hole; 14-main valve installation chamber; 15-bypass return valve installation chamber; 16-manual hydraulic pilot installation chamber; 17-pressure sensor interface; 18-sealing plug; 2- Solenoid pilot valve assembly; 3-float pilot valve assembly; 31-float; 32-hinged rod; 33-pilot valve stem; 4-main valve core assembly 4; 41-main end plug; 42-main reset spring; 43-valve sleeve; 44-main valve core; 45-damping plug; 46-automatic control hole; 47-main pilot hydraulic control chamber; 48-main connecting hole; 49-valve liquid inlet hole; 410-valve liquid outlet hole; 5-bypass valve core assembly; 51-screw; 52-valve pad; 53-bypass valve core; 54-screw plug; 55-accommodating chamber; 56-hydraulic control hole; 6-manual hydraulic pilot valve assembly; 61-pilot valve seat; 62-pilot valve core; 63-pilot pressure sleeve; 64-pilot return spring; 65-pilot end plug; 66-screw; 67-baffle; 68-valve stem; 69-handwheel; 610-auxiliary pilot hydraulic control chamber; 611-pilot connecting hole; 7- one-way valve assembly; 8- pilot filter assembly; 9- sealing plate; 10- liquid tank body; 101- steel pipe. DETAILED DESCRIPTION

[0030] In order to make the technical purpose, technical solution and beneficial effects of the present invention clearer, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown herein can be arranged and designed in various different configurations.

[0031] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, which can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0033] The specific embodiment of the liquid tank for the hydraulic support involved in the present invention is shown in the figure. The liquid tank includes a liquid tank body 10 and a pilot stop valve arranged on one side of the liquid tank body 10. The structure of the liquid tank body 10 and the assembly and arrangement of the liquid tank body 10 and the pilot stop valve are basically consistent with the prior art and are not described in detail.

[0034] A mounting port is provided at the top of the left side of the liquid tank body 10, and a pilot stop valve is fixed to one side of the liquid tank body 10 by welding. In order to ensure the amount of emulsion inlet, two or more mounting ports can be provided, and each mounting port is arranged at the same height on the left side of the liquid tank body 10, and a pilot stop valve is arranged at each mounting port, so as to realize the flow of emulsion into the liquid tank body 10.

[0035] For pilot operated stop valves, such as Figure 7 As shown, the pilot stop valve includes a valve body, which in this embodiment is a valve block 1 structure composed of a plurality of channels. The valve block 1 is a rectangular block structure as a whole, and a plurality of channels are arranged on the valve block 1. The channel includes a main liquid path 11, wherein the main liquid path 11 has a main liquid inlet 111, a main liquid outlet 112 respectively connected to the main liquid inlet 111, and a bypass liquid return port 113.

[0036] The channel arrangement structure of the main liquid path 11 on the valve block 1 is as follows: two first transverse channels 114 arranged side by side at equal heights are opened on the left side wall of the valve block 1, and the left end of the transverse channel constitutes a main liquid inlet 111. The two first transverse channels 114 extend in the left-right direction. A main channel 115 extending frontward and rearward is arranged inside the valve block 1. The above-mentioned two first transverse channels 114 are connected to the main channel 115, and the first transverse channel 114 and the main channel 115 are arranged at the same height. The rear end of the main channel 115 is arranged with a pressure sensor for detecting the hydraulic pressure of the emulsion in the main channel 115. The valve block 1 has a valve port 17, and the other end is sealed with a sealing plug 18; in addition, two second transverse channels 116 arranged side by side and spaced apart are provided on the right side wall of the valve block 1, wherein the right end of one second transverse channel 116 constitutes the main liquid outlet 112, and the right end of the other second transverse channel 116 constitutes the bypass liquid return port 113, and the two second transverse channels 116 are both higher than the main channel 115, and the height of the main liquid outlet 112 is lower than the height of the bypass liquid return port 113, and the left ends of the two second transverse channels 116 are both connected to the main channel 115 through the installation chambers extending up and down. The two installation chambers are respectively the main valve installation chamber 14 and the bypass return valve installation chamber 15, and the main valve core assembly 4 for controlling the on and off of the main liquid outlet 112 is sealed and installed in the main valve installation chamber 14, and the bypass valve core assembly 5 is sealed and installed in the bypass return valve installation chamber 15.

[0037] The main liquid circuit 11 is constructed in such a way that, during the actual emulsion circulation process, the emulsion drawn out from the hydraulic system of the hydraulic support enters the first transverse channel 114 through the main liquid inlet 111, then passes through the main channel 115, flows through the main valve installation cavity 14, and then enters the main liquid outlet 112, and then enters the liquid tank body 10 through the main liquid outlet 112; and when it is necessary to cut off the liquid inlet, the main valve core 44 is driven to block the main liquid outlet 112, and the emulsion flows into the bypass return valve installation cavity 15 in the main channel 115, enters the bypass return liquid port 113 after passing through the bypass valve core assembly 5, and then enters the downstream main return liquid pipeline system by passing through the steel pipe 101 in the liquid tank body.

[0038] In order to control the main valve core assembly 4 and the bypass valve core assembly 5 and to control the on / off of the main liquid circuit 11 , a pilot control liquid circuit is further provided on the valve block 1 . The pilot control liquid circuit includes a first pilot liquid circuit 12 and a second pilot liquid circuit 13 .

[0039] The arrangement structure of the first pilot liquid circuit 12 on the valve block 1 is as follows, wherein the first pilot liquid circuit 12 includes a first longitudinal channel 122 arranged at the top of the front end of the valve block 1, and the first longitudinal channel 122 extends from front to rear to the front and rear middle position of the valve block 1, and the front end entrance of the first longitudinal channel 122 constitutes a pilot liquid inlet 121, and correspondingly, two installation cavities are provided on the left side wall of the valve block 1 at the same height as the first longitudinal channel 122, and the two installation cavities are arranged side by side at intervals in the front and rear directions and extend in the left and right directions, wherein a pilot filter assembly 8 is arranged in the front installation cavity and is connected to the first longitudinal channel 122, and is used to filter impurities in the high-pressure pilot liquid entering the first pilot liquid circuit 12, and a one-way valve assembly 7 is arranged in the rear installation cavity, which is used to perform one-way control on the flow direction of the pilot liquid to avoid backflow of the pilot liquid. A first pilot transverse channel 123 is arranged on the side wall of the rear installation cavity. The first pilot transverse channel 123 extends in the left-right direction to the middle position of the valve block 1, and finally penetrates the top of the valve block 1 upward. The outlet of the first pilot transverse channel 123 constitutes an electromagnetic pilot liquid inlet 126. At the same time, two additional branch channels are opened at the middle position of the top of the valve block 1. One of the branch channels enters the valve block 1 and extends to the right to the rear side wall of the valve block 1. The branch channel is a drainage channel 124, and its inlet It constitutes an electromagnetic pilot drain port 127, and another branch channel is a liquid control channel 125, which extends backward after entering the valve block 1, and the entrance of the branch channel constitutes an electromagnetic pilot liquid control port 128. Correspondingly, an electromagnetic pilot valve assembly 2 is installed on the top of the valve block 1, wherein the electromagnetic pilot valve assembly 2 is basically the same as the electromagnetic pilot valve assembly 2 in the prior art, and its internal inlet is connected with the electromagnetic pilot liquid inlet 126, the drain port is connected with the electromagnetic pilot drain port 127, and the control port is connected with the electromagnetic pilot liquid control port 128.

[0040] The tail end of the above-mentioned hydraulic control channel 125 is connected to a manual hydraulic control pilot installation chamber 16 extending up and down, and the manual hydraulic control pilot installation chamber 16 is arranged to pass through the valve block 1 upward. A manual hydraulic control pilot valve assembly 6 is sealed and assembled in the manual hydraulic control pilot installation chamber 16. After the pilot fluid passes through the hydraulic control channel 125 and enters the manual hydraulic control pilot valve assembly 6, the pilot opening and closing control of the manual hydraulic control pilot valve assembly 6 can be realized, thereby realizing the on-off control of the second pilot fluid circuit 13.

[0041] In the above-mentioned arrangement of the first pilot fluid circuit 12, when in actual use, the high-pressure pilot fluid enters the first longitudinal channel 122 through the pilot fluid inlet 121, is filtered by the pilot filter assembly 8, enters the one-way valve, and then enters the electromagnetic one-way valve assembly 7 through the first pilot transverse channel 123. Through the on-off control of the electromagnetic one-way valve assembly 7, the electromagnetic pilot fluid inlet 126 is selectively connected with the electromagnetic pilot fluid discharge port 127 and the electromagnetic pilot fluid control port 128, thereby realizing the discharge of the high-pressure pilot fluid and the introduction of the high-pressure pilot fluid into the electromagnetic pilot fluid control port 128, thereby realizing the pilot opening and closing control of the manual hydraulically controlled pilot valve assembly 6, and then realizing the on-off control of the second pilot fluid circuit 13.

[0042] The second pilot fluid path 13 is arranged on the valve block 1 as follows: a second longitudinal channel 131 is arranged below the manual hydraulic pilot installation chamber 16. The second longitudinal channel 131 extends in the front-to-back direction, and the side wall is upwardly connected to the manual hydraulic pilot installation chamber 16. The front end of the second longitudinal channel 131 is connected to a second pilot transverse channel 132 extending to the right, and the right end of the second pilot transverse channel 132 extends to the right to the right side of the valve block 1, thereby connecting the second pilot fluid path 13 with the outside of the valve block 1. The second pilot transverse channel 132 constitutes a pilot line outlet for the pilot fluid to flow out of the valve block 1 and enter the liquid tank body 10 after passing through the pilot control fluid path. A pilot hole 133 that penetrates the side wall of the main valve installation chamber 14 is provided on the transverse side wall at the head end of the second longitudinal channel 131. The pilot hole 133 is used for the pilot fluid in the second pilot fluid path 13 to circulate, thereby facilitating the opening and closing control of the main valve core assembly 4.

[0043] In the arrangement of the above-mentioned second pilot fluid circuit 13, during actual use, the emulsion entering from the main valve core assembly 4 enters the second pilot fluid circuit 13 through the pilot hole 133. When the manual hydraulic pilot valve assembly 6 is controlled to cut off the second pilot fluid circuit 13, the above-mentioned pilot line outlet is blocked and the pilot emulsion cannot flow; when the manual hydraulic pilot valve assembly 6 opens the second pilot fluid circuit 13, the above-mentioned pilot line outlet is opened, and the pilot emulsion is discharged to the outside of the valve block 1 through the pilot line outlet and enters the liquid tank body 10.

[0044] In order to ensure the control of the liquid circuit of the pilot stop valve, a float pilot valve assembly 3 is also provided at the above-mentioned pilot line outlet. The float pilot valve assembly 3 selects whether to block the pilot line outlet according to the liquid level height in the liquid tank body 10, and then closes the second pilot liquid circuit 13, thereby blocking the main valve core assembly 4.

[0045] The above is the arrangement form of the various channel structures of the valve block 1. Of course, in this embodiment, the above arrangements of each channel are for further precise design to meet the requirements of compact structure and reasonable layout. In other embodiments, the arrangement form of each channel on the valve block 1 may not be limited. Technical personnel in this field may arbitrarily design the corresponding structural form according to actual needs, and only need to ensure the connectivity of each channel.

[0046] In order to realize the opening and closing control of each channel, different valve assemblies are arranged in different installation cavities.

[0047] The main valve core assembly 4 includes a main valve core 44 that reciprocates to block the main liquid path 11. A main reset spring 42 is provided between the main valve core 44 and the valve block 1. A main pilot liquid control chamber 47 for accommodating high-pressure pilot liquid is provided on the side of the valve block 1 and the main valve core 44 facing away from the main liquid path 11. The main pilot liquid control chamber 47 is connected to the second pilot liquid path 13. The main valve core 44 is also provided with an automatic control channel that passes through the main liquid path 11 and the main pilot control chamber. The blocking cross-sectional area of ​​the side of the main valve core 44 close to the main liquid path 11 is smaller than the blocking cross-sectional area of ​​the side close to the main pilot liquid control chamber 47. In the actual control process, the emulsion in the main liquid path 11 can enter the main pilot control chamber through the automatic control channel, and enter the pilot hole 133 through the main pilot control chamber, and then enter the second pilot liquid path 13.

[0048] Specifically, the main valve installation cavity 14 is connected with the main liquid inlet 111 and the main liquid outlet 112, and the main valve core assembly 4 includes a valve sleeve 43 sealed and fixed in the main valve installation cavity 14. The bottom of the valve sleeve 43 forms a valve liquid inlet hole connected with the main liquid inlet 111. The cross-section of the valve liquid inlet hole is a conical structure with a narrow bottom and a wide top, which is convenient for sealing with the main valve core 44 to seal the valve liquid inlet hole. The outer circle below the side wall of the valve sleeve 43 has a valve liquid outlet hole connected with the main liquid outlet 112. There are several valve liquid outlets, which are spaced axially around them. The main valve core 44 is guided and assembled in the valve sleeve 43, and cooperates with the bottom side wall of the valve sleeve 43 to seal the main liquid pipeline. The main end plug 41 is sealed above the valve core in the main valve installation cavity 14. The main end plug 41 is threadedly sealed and assembled with the main valve installation cavity 14, and the main reset spring 42 is top-mounted between the main end plug 41 and the main valve core 44; the valve sleeve 43 is provided with a main connecting hole 48 connecting the second pilot liquid circuit 13 and the main pilot liquid control cavity 47, and the main connecting hole 48 is connected to the above-mentioned pilot hole 133. In order to facilitate the emulsion in the liquid inlet hole of the valve sleeve 43 to enter the main pilot hydraulic control chamber 47, a self-control hole 46 extending through the upper and lower sides is opened at the axial position of the valve core, and the lower end of the self-control hole 46 is blocked by a damping plug 45. The damping plug 45 is provided with a tiny hole connected to the self-control hole 46. The self-control hole 46 and the damping plug 45 constitute the above-mentioned self-control flow channel. Through the arrangement of the self-control hole 46 and the damping plug 45, the emulsion can enter the pilot hydraulic control chamber through the self-control flow channel, and the emulsion can form a pressure difference to quickly enter the main pilot hydraulic control chamber 47 to realize the subsequent cut-off control of the main valve core 44.

[0049] During actual operation, the main valve core 44 is pushed upward by the emulsion, overcoming the elastic force of the main reset spring 42 and pushing the main valve core 44 upward to realize the conduction of the main liquid circuit 11. When the second pilot liquid circuit 13 is controlled to be closed, the emulsion enters the main pilot liquid control chamber 47 through the self-controlled flow channel. Since the cross-sectional area of ​​one side of the pilot liquid hole cavity is larger than the cross-sectional area at the valve inlet, under equal pressure conditions, the pressure at the upper end of the valve core is greater than the pressure at the lower end, and the valve core is pressed downward at the valve inlet, thereby blocking the main liquid outlet 112.

[0050] The bypass valve core assembly 5 includes a bypass valve core 53 movably assembled in the bypass return valve installation cavity 15. The bypass valve core 53 is opened by the upward push of the emulsion below. The bottom of the bypass valve core 53 has a sealing end face that is sealed with the main liquid path 11. The top of the bypass valve core 53 is provided with a accommodating cavity 55. The top of the bypass valve core 53 is open. A screw plug 54 is provided for sealing the upper part of the bypass valve core 53. The side wall of the bypass valve core 53 is provided with a liquid control hole 56 that passes through the accommodating cavity 55 and the bypass return liquid port 113. The liquid control hole 56 is for reflux liquid to enter the accommodating cavity 55 to drive the bypass valve core 53 to block downward in the main liquid path 11 to prevent the liquid in the downstream main return liquid pipeline system from flowing back to the main channel 115 of the main liquid path 11.

[0051] Specifically, a screw plug 54 is provided at the top thread sealing plug of the bypass return valve installation cavity 15, and a bypass valve core 53 is arranged below the screw plug 54 along the up-down direction. The bottom of the bypass valve core 53 is open, and a fixing screw 51 is provided at the bottom thread sealing plug of the bypass valve core 53. A valve gasket 52 is provided between the fixing screw 51 and the bypass valve core 53, and a hydraulic control hole 56 is provided on the side wall of the bottom of the bypass valve core 53 near the fixing screw 51.

[0052] In actual operation, after the main valve core assembly 4 closes the main liquid outlet 112, the emulsion flows upward into the bypass return valve installation cavity 15 through the main channel 115, and pushes the bypass valve core 53 upward to open the bypass return liquid port 113, and the emulsion also flows back through the bypass return liquid port 113 and no longer enters the liquid tank body 10. The structure of the designed accommodating chamber 55 and the hydraulic control hole 56 is mainly designed to prevent the emulsion of the downstream main return liquid pipeline system from flowing back into the valve block 1 through the bypass return liquid. Specifically, when the back pressure of the emulsion of the downstream main return liquid pipeline system connected to the bypass return liquid pipeline system is too high, it will flow back along the bypass return liquid pipeline into the bypass return valve installation chamber 15. This part of the reflux liquid enters the accommodating chamber 55 through the hydraulic control hole 56. Then, because the upper pressure formed by the difference in area between the upper part and the lower part of the bypass valve core 53 is greater than the lower pressure, the bypass valve core 53 always has a tendency to block the main channel 115 downward, thereby ensuring that the bypass valve core 53 and the valve pad 52 are effectively sealed with the valve block 1, preventing the emulsion of the downstream main return liquid pipeline from flowing back through the bypass return liquid pipeline.

[0053] The manual hydraulically controlled pilot valve assembly 6 includes a pilot valve core 62 movably arranged on the second pilot fluid circuit 13. In order to realize manual control of the pilot valve core 62, a manual driving structure is also provided on the valve block 1. The manual driving structure is used to cooperate with the pilot valve core 62. A pilot return spring 64 is provided between the pilot valve core 62 and the valve block 1. An auxiliary pilot fluid control chamber 610 is provided between the pilot valve core 62 and the manual driving structure. The auxiliary pilot fluid control chamber 610 is connected to the first pilot fluid circuit 12 to drive the pilot valve core 62 to block the second pilot fluid circuit 13 after liquid is introduced into the auxiliary pilot fluid control chamber 610.

[0054] Specifically, the manual hydraulically controlled pilot valve assembly 6 includes a valve housing sealed and assembled in the corresponding manual hydraulically controlled pilot mounting cavity 16, the pilot valve core 62 is guided and assembled in the valve housing, the pilot return spring 64 is top-mounted between the valve housing and the pilot valve core 62, and a pilot connecting hole 611 connecting the first pilot fluid path 12 and the pilot hydraulic control cavity is provided on the side wall of the valve housing. A threaded hole is also provided on the valve housing, and the axis of the threaded hole is consistent with the axis of the pilot valve core 62. The manual drive structure includes a valve stem 68 threadedly assembled in the threaded hole, and a handwheel 69 is connected to the top of the valve stem 68. Meanwhile, the valve housing includes a pilot valve seat 61, a pilot end plug 65, a pilot pressure sleeve 63, a pilot baffle 67, etc., wherein the pilot valve seat 61 is arranged separately from other structures and sealed and fixed at the bottom of the manual hydraulic pilot installation chamber 16, and has a valve port on it which is sealed and assembled with the pilot valve core 62. The pilot valve core 62 is inserted into the valve port to separate the manual hydraulic pilot installation chamber 16 from the second longitudinal channel 131. The pilot end plug 65 and the pilot pressure sleeve 63 are inserted into each other, and the pilot valve core 62 is guided and inserted therein, and the pilot communication hole 611 is arranged on the side of the pilot end plug 65, and the space between the inner end surface of the pilot end plug 65 and the top end surface of the pilot valve core 62 constitutes the pilot hydraulic control chamber.

[0055] The lower end of the valve stem 68 is inserted into the pilot end plug 65, and the lower end head forms a sliding seal with the pilot end plug 65. The middle part is connected with the internal thread of the pilot end plug 65. A square is set at one end of the upper side of the valve stem 68 to cooperate with the square hole of the hand wheel 69. The upper end is limited by a screw mold. The hand wheel 69 drives the valve stem 68 to rotate together, rotate inside the pilot end plug 65 and move axially up and down. The upper side of the pilot valve core 62 is inserted into the lower part of the pilot end plug 65, and the pilot reset spring 64 is installed between the two. The lower side of the pilot end plug 65 is threadedly connected with the pilot end plug 65 through the pilot pressure sleeve 63 to limit and fix the pilot reset spring 64. The middle of the pilot pressure sleeve 63 is provided with a light hole to contact the pilot valve core 62 forms a sliding seal, the maximum outer circle of the pilot end plug 65 is connected to the inside of the valve block 1, and is limited on the valve block 1 by the baffle 67 and the screw 66. When working, turn the hand wheel 69, the hand wheel 69 drives the release spiral to rotate, the valve stem 68 moves axially downward, and pushes the pilot valve core 62 below to move downward, forming a seal with the pilot valve seat 61 below, closing the manual hydraulic pilot installation cavity 16 and the second pilot liquid circuit 13. When not working, turn the hand wheel 69 in the opposite direction, the hand wheel 69 drives the valve stem 68 to move spirally upward, and disengages from the pilot valve core 62. Under the action of the pilot return spring 64 pad, the pilot valve core 62 disengages from the pilot valve seat 61 and no longer forms a seal.

[0056] In actual use, the high-pressure pilot fluid in the first pilot fluid path 12 enters the pilot fluid control chamber through the pilot fluid inlet 121, and pushes the pilot valve core 62 downward to extend and insert into the pilot valve seat 61, thereby blocking the second pilot fluid path 13. When there is no high-pressure pilot fluid in the first pilot fluid path 12, the pilot return spring 64 returns to its original position, pulling the pilot valve core 62 back upward, and the second pilot fluid path 13 can be opened.

[0057] The electromagnetic pilot valve assembly 2 is installed on the top of the valve block 1 and fixed to the valve block 1 by screws. The electromagnetic pilot valve assembly 2 is mainly used to control the opening and closing of the pilot fluid through the electromagnetic pilot valve fluid inlet to the electromagnetic pilot fluid control port 128.

[0058] The float pilot valve assembly 3 includes an articulated rod 32 rotatably suspended on the valve block 1, the end of the articulated rod 32 is connected to a float 31, the head end of the articulated rod 32 is connected to a pilot valve stem 33 for blocking the second pilot fluid line, the movement of the float 31 drives the articulated rod 32 to rotate, and then drives the pilot valve stem 33 to block the second pilot fluid line 13 and open the second pilot fluid line 13.

[0059] A sealing plate 9 is welded to the right side of the above-mentioned valve block 1, and the sealing plate 9 is integrally welded to the mounting port on the side wall of the liquid tank body 10. Specifically, a hole is opened on the side wall of the liquid tank body 10, and then the sealing plate 9 is welded to the mounting port, wherein the float pilot valve assembly 3 is installed inside the liquid tank body 10, and the valve block 1 and other series valve assemblies are installed outside the liquid tank body 10, the main liquid inlet 111 on the valve block 1 is arranged on the outside of the liquid tank body 10, the main liquid outlet 112 is arranged inside the body, the bypass liquid return port 113 is placed inside the liquid tank body 10, and passes through the liquid tank body 10 through a welded steel pipe 101 to reach the right outer side of the liquid, and then connected to the downstream main liquid return pipeline system.

[0060] How it actually works: When the pilot stop valve is working, when it is necessary to stop the main return liquid of the coal mining face from entering the main liquid inlet 111, the high-pressure pilot liquid is introduced from the pilot liquid inlet 121, enters the first pilot liquid path 12, and is filtered by the pilot filter assembly 8, and then enters the electromagnetic pilot liquid inlet 126 in the valve block 1 through the one-way valve assembly 7, and then enters the inlet of the corresponding electromagnetic pilot valve assembly 2. At this time, the electromagnetic pilot valve assembly 2 is opened, and the control port of the electromagnetic pilot valve assembly 2 is connected with the electromagnetic pilot liquid control port 128, and first enters the manual hydraulic pilot installation cavity 16 through the liquid control channel 125, and enters the auxiliary pilot liquid control cavity 610 through the pilot connecting hole 611, controls the pilot valve core 62 of the manual hydraulic pilot valve assembly 6 to extend, closes the second pilot liquid path 13, and then closes the main valve core 44 of the main valve core assembly 4 and the main end plug 41. The pilot line outlet is connected to the pilot hydraulic control chamber 47. At this time, a part of the emulsion introduced into the main liquid inlet 111 of the valve block 1 enters the main pilot hydraulic control chamber 47 of the main valve core assembly 4 through the damping plug 45 and the self-control hole 46 on the main valve core 44. After the main pilot hydraulic control chamber 47 is filled with high-pressure pilot liquid, since the cross-sectional area of ​​the upper part of the main valve core 44 of the main valve core assembly 4 is larger than the cross-sectional area of ​​the lower part of the main valve core 44, the force of the upper part of the main valve core 44 is larger than the force of the lower part of the main valve core 44, the main valve core 44 moves downward and closes the main liquid outlet 112, cutting off the discharge of the main return liquid of the coal mining working face from the main liquid outlet 112. At this time, the emulsion enters the bypass return valve installation chamber 15, opens the bypass valve core 53 of the bypass valve core assembly 5, enters the bypass return liquid port 113, and then enters the downstream main return liquid pipeline system through the steel pipe 101 in the liquid tank body.

[0061] In addition, when the high-pressure pilot liquid is introduced into the pilot liquid inlet 121, it is filtered by the pilot filter assembly 8 and enters the one-way valve assembly 7. The one-way valve assembly 7 is opened, and the high-pressure pilot liquid enters the electromagnetic pilot liquid inlet 126 on the valve block 1, and then enters the inlet of the corresponding electromagnetic pilot valve assembly 2. At this time, the electromagnetic pilot valve assembly 2 is closed, and then the connection between the electromagnetic pilot liquid inlet 126 and the electromagnetic pilot liquid control port 128 is closed. At this time, the high-pressure pilot liquid will no longer enter the electromagnetic pilot liquid control port 128 from the control port on the electromagnetic pilot valve electromagnetic pilot valve assembly 2, and then no longer flow into the auxiliary pilot liquid control port 128 of the manual hydraulic pilot valve assembly 6. In the cavity 610, the pilot line outlet connected to the main pilot hydraulic control cavity 47 of the main valve core assembly 4 is no longer closed, and the main pilot hydraulic control cavity 47 in the main valve core assembly 4 is no longer closed. At this time, the emulsion introduced into the main liquid inlet 111 of the valve block 1 enters the main pilot hydraulic control cavity 47 through the self-control hole 46 and the damping plug 45, and then enters the second pilot liquid circuit 13 from the pilot hole 133, and is discharged through the pilot line outlet, resulting in no pressure difference between the upper and lower surfaces of the main valve core 44, and the main liquid outlet 112 will not be closed, and the emulsion normally flows into the liquid tank body 10 through the main liquid inlet 111 and the main liquid outlet 112.

[0062] When the electromagnetic pilot valve assembly 2 fails or fails to control, and manual control of opening and closing is required, during the normal discharge of the emulsion, if the hand wheel 69 of the manual hydraulic pilot valve assembly 6 is turned, the hand wheel 69 drives the valve stem 68 to rotate, and the valve stem 68 moves downward in a spiral, pushing the pilot valve core 62 and the pilot valve seat 61 to form a seal, thereby sealing the pilot line outlet connected to the main pilot hydraulic control chamber 47. At this time, a part of the emulsion entering the main liquid inlet 111 of the valve block 1 enters the main pilot hydraulic control chamber 47 through the self-control hole 46 and the damping plug 45 on the main valve core 44. When the main pilot hydraulic control chamber 47 is filled with When the high-pressure pilot fluid is full, since the cross-sectional area of ​​the upper part of the main valve core 44 of the main valve core assembly 4 is larger than the cross-sectional area of ​​the lower part of the main valve core 44, the force on the upper part of the main valve core 44 is larger than the force on the lower part of the main valve core 44, so that the main valve core 44 moves downward and closes the main liquid outlet 112, cutting off the main return liquid of the coal mining working face from flowing into the liquid tank body 10 through the main liquid outlet 112. At this time, the emulsion enters the bypass return valve installation cavity 15, opens the bypass valve core 53 of the bypass valve core assembly 5, enters the bypass return liquid port 113, and then enters the bypass return liquid pipeline system by passing through the steel pipe 101 in the liquid tank body 10.

[0063] When the electromagnetic pilot valve assembly 2 and the manual hydraulic pilot valve assembly 6 are unable to operate due to power failure or failure, the emulsion of the coal mining face enters the liquid tank body 10 through the valve block 1. When the liquid level of the liquid tank body 10 gradually rises, when the liquid level of the liquid tank body 10 contacts the float pilot valve assembly 3, the float 31 assembly begins to float upward and drives the hinge rod 32 to swing upward. When it reaches the specified position, the pressure block on the hinge rod 32 contacts the pilot valve stem 33 and pushes the pilot valve stem 33 to block the outlet of the pilot line, thereby closing the circulation of the second pilot liquid line 13. At this time, part of the emulsion entering the main liquid inlet 111 of the valve block 1 passes through the automatic control hole 4 on the main valve core 44. 6 and the damping plug 45 enter the main pilot hydraulic control chamber 47. When the main pilot hydraulic control chamber 47 is filled with high-pressure emulsion, since the cross-sectional area of ​​the upper part of the main valve core 44 of the main valve core assembly 4 is larger than the cross-sectional area of ​​the lower part of the main valve core 44, the force of the upper part of the main valve core 44 is larger than the force of the lower part of the main valve core 44, so that the main valve core 44 moves downward and closes the main liquid outlet 112, and the main return liquid of the coal mining working face is cut off from the main liquid inlet 111 through the main liquid outlet 112 to flow into the liquid tank body 10. At this time, the emulsion enters the bypass return valve installation chamber 15, opens the bypass valve core 53 of the bypass valve core assembly 5, enters the bypass return liquid port 113, and then enters the bypass return liquid pipeline system through the steel pipe 101 in the liquid tank body 10.

[0064] The above-mentioned electromagnetic pilot valve assembly 2 can be involved in the local monitoring system and the remote monitoring system, and the opening and closing of the electromagnetic pilot valve assembly 2 can be remotely controlled through the monitoring system, thereby controlling the opening and closing of the main valve core assembly 4, and cutting off the flow of the coal mining working face in the valve block 1.

[0065] The pilot operated stop valve has the following functions: 1. Through the opening and closing of the electromagnetic pilot valve assembly 2, the opening and closing of the manual hydraulic pilot valve assembly 6 is pilot-controlled, and then the opening and closing of the main valve core assembly 4 is controlled to realize the opening and closing control of the liquid return of the coal mining working face.

[0066] 2. By rotating the hand wheel 69, the opening and closing of the manual hydraulic pilot valve assembly 6 is controlled, and then the opening and closing of the main valve core assembly 4 is controlled to realize the opening and closing control of the return liquid of the coal mining working face.

[0067] 3. After the above two control methods cut off the return liquid from the coal mining face from entering the liquid tank body 10, the main return liquid from the coal mining face simultaneously enters the bypass return liquid port 113, and the bypass valve core 53 is opened synchronously to enter the downstream main return liquid pipeline system connected to the bypass return liquid pipeline system.

[0068] 4. Through local monitoring and remote monitoring, the opening and closing of the electromagnetic pilot valve assembly 2 can be controlled to achieve local control and remote control.

[0069] The structure of the pilot-operated stop valve in the embodiment of the present invention is consistent with the structure of the pilot-operated stop valve in the embodiment of the liquid tank body 10 assembly for the hydraulic support described above, and will not be described in detail.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate but not limit the technical solutions of the present invention, and any equivalent substitutions of the present invention and any modifications or partial substitutions that do not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. Pilot operated stop valve, characterized in that: It includes a valve body, on which a main fluid circuit and a pilot control fluid circuit are arranged; The main liquid circuit has a main liquid inlet, a main liquid outlet and a bypass liquid return port respectively connected to the main liquid inlet, a main valve core assembly is provided at the main liquid circuit corresponding to the main liquid outlet, and a bypass valve core assembly is provided at the bypass liquid return port; The pilot control fluid circuit comprises a first pilot fluid circuit and a second pilot fluid circuit, the first pilot fluid circuit is provided with an electromagnetic pilot valve assembly, and the second pilot fluid circuit is provided with a manual hydraulically controlled pilot valve assembly; The main valve core assembly includes a main valve core that reciprocates to block the main liquid path, a main reset spring is provided between the main valve core and the valve body, a main pilot hydraulic control chamber is provided between the valve body and the main valve core on the side facing away from the main liquid path, the main pilot hydraulic control chamber is communicated with the second pilot hydraulic path, and a self-control flow channel that passes through the main liquid path and the main pilot control chamber is also provided on the main valve core, and the blocking cross-sectional area of ​​the side of the main valve core close to the main liquid path is smaller than the blocking cross-sectional area of ​​the side close to the main pilot hydraulic control chamber; The manual hydraulic pilot valve assembly comprises a pilot valve core movably arranged on the second pilot fluid path, a manual driving structure is also arranged on the valve body, the manual driving structure is used to cooperate with the pilot valve core, a pilot return spring is arranged between the pilot valve core and the valve body, and an auxiliary pilot hydraulic control chamber is arranged between the pilot valve core and the manual driving structure; The auxiliary pilot liquid control chamber is communicated with the first pilot liquid path, so as to drive the pilot valve core to block the second pilot liquid path after liquid is introduced into the auxiliary pilot liquid control chamber.

2. The pilot operated stop valve according to claim 1, characterized in that: The second hydraulic control pipeline is also provided with a float pilot valve assembly for blocking the second pilot fluid path driven by the rising liquid level.

3. The pilot operated stop valve according to claim 2, characterized in that: The float pilot valve assembly includes an articulated rod rotatably suspended on a valve body, a float is connected to the end of the articulated rod, the head end of the articulated rod is abutted against a pilot valve stem in a second pilot fluid path for blocking the pilot fluid path, and the action of the float drives the articulated rod to rotate, thereby driving the pilot valve stem to block the second pilot fluid path and open the second pilot fluid path.

4. The pilot operated stop valve according to claim 1, characterized in that: The valve body is provided with a main valve installation cavity, and the main valve installation cavity is connected with the main liquid inlet and the main liquid outlet. The main valve core assembly includes a valve sleeve sealed and fixed in the main valve installation cavity, and the bottom of the valve sleeve forms a valve inlet hole connected with the main liquid inlet, and the side wall of the valve sleeve is provided with a valve outlet hole connected with the main liquid outlet. The main valve core guide is assembled in the valve sleeve and cooperates with the bottom side wall of the valve sleeve to seal the main liquid pipeline. The main valve installation cavity is sealed with a main end plug above the valve core, and a main reset spring is installed between the main end plug and the main valve core. The valve sleeve is provided with a main connecting hole connecting the second pilot liquid circuit and the main pilot liquid control cavity.

5. The pilot operated stop valve according to claim 1, characterized in that: The manual hydraulically controlled pilot valve assembly includes a manual hydraulically controlled pilot installation cavity arranged in the valve body, the manual hydraulically controlled pilot installation cavity is communicated with the first pilot fluid circuit and the second pilot fluid circuit, the manual hydraulically controlled pilot valve assembly includes a valve housing sealed and assembled in the manual hydraulically controlled pilot installation cavity, the pilot valve core guide is assembled in the valve housing, the pilot return spring is top-mounted between the valve housing and the pilot valve core, a pilot connecting hole communicating with the first pilot fluid circuit and the pilot hydraulic control cavity is provided on the side wall of the valve housing, a threaded hole is also provided on the valve housing, the axis of the threaded hole is consistent with the axis of the pilot valve core, the manual drive structure includes a valve stem threadedly assembled in the threaded hole, and a handwheel is connected to the top of the valve stem.

6. The pilot operated stop valve according to claim 1, characterized in that: The height of the main liquid inlet is lower than that of the main liquid outlet, and the height of the main liquid outlet is lower than that of the bypass liquid return port. A bypass return valve installation cavity is provided on the valve body, and the bypass valve core assembly includes a bypass valve core movably assembled in the bypass return valve installation cavity. The bypass valve core is opened by being pushed upward by the liquid below, and the bottom of the bypass valve core has a sealing end face that is sealed with the main liquid path. An accommodating cavity is provided on the top of the bypass valve core, and the top of the bypass valve core is open. A screw plug is provided above the bypass valve core, and a liquid control hole that passes through the accommodating cavity and the bypass liquid return port is provided on the side wall of the bypass valve core. The liquid control hole is used for the liquid that flows back in reverse to enter the accommodating cavity to drive the bypass valve core downward to block the main liquid path.

7. The pilot operated stop valve according to claim 1, characterized in that: The first pilot fluid path is also provided with a pilot filter structure and a one-way valve.

8. The pilot operated stop valve according to any one of claims 1 to 7, characterized in that: The valve body is a valve block structure composed of a plurality of channels, the main liquid inlet is arranged on one side of the valve block, the main liquid outlet and the bypass liquid return port are arranged on the other side of the valve block, and the main valve core assembly, bypass valve core assembly, electromagnetic pilot valve assembly and manual hydraulic pilot valve assembly are arranged on the top of the valve block.

9. The pilot operated stop valve according to claim 8, characterized in that: A sealing plate for mounting on the side wall of the liquid tank body is provided on one side of the valve block, and the sealing plate is sealingly assembled with the valve block.

10. A liquid tank for a hydraulic support, comprising a liquid tank body, one side of which is provided with a liquid discharge port, and a pilot stop valve is also provided on the side wall of the liquid tank body, characterized in that: The pilot-operated stop valve is the pilot-operated stop valve described in any one of claims 1 to 9 above.

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