Pressurized top-wiping frame-moving valve

Abstract

The utility model discloses an under-pressure top wiping and moving frame valve which comprises a valve body, a movable channel transversely penetrating through the valve body is arranged in the valve body, the interior of the movable channel is sequentially divided into a left end cavity, a middle cavity and a right end cavity from left to right, a first limiting convex ring is arranged on the inner wall of the movable channel between the left end cavity and the middle cavity, and a second limiting convex ring is arranged on the inner wall of the movable channel between the left end cavity and the middle cavity. A valve sleeve is connected to the inner wall of the movable channel between the middle cavity and the right end cavity in an embedded mode, and a center cavity is formed in the valve sleeve. An oil return port is formed in the side wall of one side of the left end cavity, an oil inlet port is formed in the side wall of one side of the middle cavity, a pilot control port and a pressure maintaining control port are formed in the side walls of the two sides of the right end cavity respectively, the center cavity is communicated with the pilot control port and the pressure maintaining control port through a communicating oil way, and the pressure maintaining control port is communicated with the oil return port. A control rod mechanism is arranged in the movable channel and connected with the movable channel in a sliding mode.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic supports, in particular to a pressure-wiping top-moving support valve. Background Art

[0002] Coal mining is a comprehensive mechanization process, and hydraulic supports are used to support the roof. Existing hydraulic supports generally adopt a cyclic action mode of "lowering the column, moving the frame, and raising the column" when working. This working method is not suitable for unstable direct roof, false roof, and broken roof geological conditions. Due to the repeated lowering and raising of the support column, the roof is accelerated to break, which often leads to the roof sinking when the support column is lowered, causing roof leakage and roof collapse accidents, affecting the roof control effect of the hydraulic support and limiting its scope of use.

[0003] Patent No. ZL201621031913.0 discloses a pressure-carrying frame-shifting valve, which can realize pressure-maintaining operation and provide a certain protective effect on the top plate during the frame-shifting process; however, the valve body is an integral structure, which is inconvenient to disassemble and difficult to perform valve body maintenance operations; at the same time, the valve stem inside the valve body is an integral structure, and when performing the pressure-maintaining operation, it completely relies on the elastic force of the spring to move the valve stem. The movement resistance is large, and the valve stem cannot achieve a fast movement response effect, so it is necessary to improve it. Summary of the Invention

[0004] The utility model aims to solve the above problems and provide a pressure-controlled top-wiping frame moving valve which has a simple structure and improves the safety of frame moving.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A pressure-sensitive top-moving frame valve comprises a valve body, wherein a movable channel is provided in the valve body and passes through the valve body transversely. The interior of the movable channel is divided into a left end cavity, a middle cavity and a right end cavity from left to right. A first limiting convex ring is provided on the inner wall of the movable channel between the left end cavity and the middle cavity, a valve sleeve is embedded on the inner wall of the movable channel between the middle cavity and the right end cavity, and a central cavity is provided inside the valve sleeve; a side wall of one side of the left end cavity is provided with an oil return port connected to the outside world, and a side wall of one side of the middle cavity is provided with a The oil inlet port and the side walls on both sides of the right end cavity are respectively provided with a pilot control port and a pressure maintaining control port connected to the outside world. The side walls on both sides of the valve sleeve are provided with a connecting oil passage and the central cavity is connected with the pilot control port and the pressure maintaining control port through the connecting oil passage, and the pressure maintaining control port is connected with the oil return port. A control rod mechanism is provided in the movable channel, and the control rod mechanism is slidably connected with the movable channel and controls the connection status between the oil return port, the oil inlet port, the pilot control port and the pressure maintaining control port through sliding action.

[0007] Furthermore, the control lever mechanism includes a valve stem, a ejector pin, a push rod, and an elastic reset assembly; the valve stem, the ejector pin, and the push rod are coaxially arranged, and the end of the left end cavity away from the middle cavity is detachably connected to the adjusting assembly; one end of the valve stem is located in the left end cavity and abuts against the adjusting assembly, the other end of the valve stem extends into the middle cavity and abuts against one end of the ejector pin, and the other end of the ejector pin extends into the central cavity of the valve sleeve; the elastic reset assembly is located in the left end cavity and connected to the valve stem; an oil control interface is detachably connected to the right end cavity, and a push rod is slidably connected to the oil control interface, and the end of the push rod close to the valve sleeve extends into the central cavity inside the valve sleeve and abuts against the end of the ejector pin.

[0008] Furthermore, a second limiting convex ring is provided on the outer periphery of the middle part of the valve stem, and the elastic reset component is abutted and limited by the second limiting convex ring; the outer diameter of the valve stem near one end of the valve sleeve is adapted to the inner diameter of the movable channel and a sealed sliding state is maintained between the two.

[0009] Furthermore, the adjusting assembly includes a mounting sleeve, a spring seat, an adjusting spring, and a pressure-adjusting screw; one end of the mounting sleeve is inserted into the left end cavity and is threadedly connected to the valve body, a third limiting convex ring is integrally formed in the mounting sleeve, the adjusting spring is located in the mounting sleeve and is arranged at the left end of the third limiting convex ring, one end of the adjusting spring abuts against the spring seat and, under the action of elasticity, forces the spring seat to abut against the left end wall of the third limiting convex ring, the other end of the adjusting spring abuts against the pressure-adjusting screw, the pressure-adjusting screw is located in the mounting sleeve and is threadedly connected to the inner wall of the mounting sleeve; the end of the valve stem close to the adjusting assembly passes through the third limiting convex ring and abuts against the spring seat.

[0010] Furthermore, the elastic reset assembly includes a sleeve, a reset spring, and a valve core. The sleeve, reset spring, and valve core are all sleeved on the outside of the valve stem and located between the second limiting convex ring and the third limiting convex ring. One end of the reset spring abuts against the valve core and, under the elastic action, forces the valve core to abut against the first limiting convex ring to achieve a blocking sealing effect between the left end cavity and the middle cavity; the valve core is arranged on one side of the second limiting convex ring and is slidingly connected to the valve stem; the other end of the reset spring abuts against the sleeve that is clamped and connected to the outside of the valve stem, the outer wall of the sleeve is slidingly connected to the inner wall of the mounting sleeve, and an avoidance gap is provided between the end of the sleeve away from the reset spring and the third limiting convex ring.

[0011] Furthermore, a stepped structure is provided on the inner wall of the oil control interface, and the push rod is slidingly connected to the inner wall of the oil control interface and, under the elastic action of the adjusting spring, the push rod is pushed through the spring seat, valve stem, and push pin to abut against the stepped structure inside the oil control interface, thereby achieving sealing of the oil control interface.

[0012] Furthermore, the valve sleeve is slidably connected to the ejector pin and the ejector rod to maintain their sealing properties.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are:

[0014] When the utility model is in normal liquid filling, the hydraulic oil in the pump station enters the middle cavity from the oil inlet port and squeezes the valve core away from the first limit convex ring, so that the hydraulic oil comes out from the oil return port and enters the lower cavity of the column, realizing the column lifting action of the bracket. After the column lifting action is completed, under the action of the reset spring, the valve core returns to its original position, and the left end cavity and the middle cavity are in a partition state;

[0015] When returning the liquid, there is a high-pressure load on the oil control interface (i.e., the upper cavity of the column), and the high-pressure hydraulic oil pushes the ejector rod, ejector pin, valve stem, and elastic reset assembly to move to the left together. At this time, the spring seat squeezes the adjusting spring, and the adjusting spring is in a contracted state. The valve core moves away from the first limit convex ring, and the left end cavity is connected with the middle cavity. The high-pressure oil in the lower cavity of the column flows back to the oil inlet port through the oil return port, realizing the column lowering action of the bracket. After the column lowering action is completed, the ejector rod, ejector pin, valve stem, and elastic reset assembly return to their original positions under the elastic action of the adjusting spring.

[0016] When the pressure-maintaining frame is moved, during the normal liquid return process, the pilot control port is allowed to flow in, and the oil enters the central cavity inside the valve sleeve through the connecting oil path, and then connects with the oil return port through the pressure-maintaining control port; at this time, the oil in the central cavity will squeeze the ejector rod to the right end and block the oil control interface. After the pressure of the high-pressure liquid in the oil control interface is lost, the elastic action of the regulating spring quickly pushes the valve stem, ejector pin, and elastic reset assembly to return to their original position. After the valve core returns to its original position, the connection between the left end cavity and the middle cavity is cut off. The entire valve body is in a pressure-maintaining state, which has a certain supporting force on the ejector plate during the frame moving operation;

[0017] The frame-shifting valve structure in the utility model is a multi-component assembled structure, which can be quickly disassembled and assembled, and is convenient for the later maintenance of the valve body. At the same time, the split structural design of the valve stem and the push rod can first seal the oil control interface through the push rod when performing the pressure maintaining operation, which greatly reduces the movement resistance of the valve stem, so that the valve stem can drive the elastic reset component to quickly return to its original position under the action of the adjusting spring, thereby achieving a rapid response effect, effectively improving the pressure maintaining action response rate of the pressure-wiping frame-shifting valve, and further improving the use effect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is a cross-sectional structural diagram of the utility model;

[0020] Figure 2 It is a cross-sectional structural diagram of the valve body;

[0021] Figure 3 This is the hydraulic oil circuit connection diagram of the valve body. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the scope of protection of the present invention.

[0023] like Figure 1 、 Figure 2 and Figure 3 As shown, this embodiment discloses a pressure-sensitive top-moving frame valve, comprising a valve body 1, wherein the valve body 1 is provided with a movable channel that runs transversely through the valve body, and the interior of the movable channel is divided into a left end cavity 101, a middle cavity 102, and a right end cavity 103 from left to right. A first limiting convex ring 108 is provided on the inner wall of the movable channel between the left end cavity 101 and the middle cavity 102, and a valve sleeve 7 is embedded on the inner wall of the movable channel between the middle cavity 102 and the right end cavity 103, and a central cavity 701 is provided inside the valve sleeve 7; a side wall of one side of the left end cavity 101 is provided with an oil return port 104 (port A) connected to the outside world, and a side wall of one side of the middle cavity 102 is provided with an oil inlet port connected to the outside world Port 105 (P port), the side walls on both sides of the right end cavity 103 are respectively provided with a pilot control port 106 (K1 port) and a pressure maintaining control port 107 (K2 port) connected to the outside world, and a connecting oil path 702 is provided on both side walls of the valve sleeve 7, and the central cavity 701 is connected with the pilot control port 106 and the pressure maintaining control port 107 through the connecting oil path 702, and the pressure maintaining control port 107 is connected with the return oil port 104; a control rod mechanism is provided in the movable channel, and the control rod mechanism is slidably connected to the movable channel and controls the connection status between the return oil port 104, the oil inlet port 105, the pilot control port 106 and the pressure maintaining control port 107 through the sliding action.

[0024] The control lever mechanism includes a valve stem 4, an ejector pin 5, an ejector rod 6, and an elastic reset assembly; the valve stem 4, the ejector pin 5, and the ejector rod 6 are coaxially arranged, and the end of the left end cavity 101 away from the middle cavity 102 is detachably connected to the adjusting assembly 2; one end of the valve stem 4 is located in the left end cavity 101 and abuts against the adjusting assembly 2, the other end of the valve stem 4 extends into the middle cavity 102 and abuts against one end of the ejector pin 5, and the other end of the ejector pin 5 extends into the central cavity 701 of the valve sleeve 7; the elastic reset assembly is located in the left end cavity 101 and connected to the valve stem 4; the oil control interface 3 (K3 port) is detachably connected to the right end cavity 103, and the ejector rod 6 is slidably connected to the oil control interface 3, and the end of the ejector rod 6 close to the valve sleeve 7 extends into the central cavity 701 inside the valve sleeve 7 and abuts against the end of the ejector pin 5; the valve sleeve 7 is slidably connected to the ejector pin 5 and the ejector rod 6 to maintain its sealing.

[0025] The inner wall of the oil control interface 3 is provided with a stepped structure, and the push rod 6 is slidably connected to the inner wall of the oil control interface 3 and, under the elastic action of the adjusting spring 22, pushes the push rod 6 through the spring seat 23, the valve stem 4, and the push pin 5 to abut against the stepped structure inside the oil control interface 3, so as to achieve the blocking of the oil control interface 3.

[0026] Through the split design of the valve stem, ejector pin and ejector rod, the ejector rod can be reset first during the reset action to reduce the reset resistance of the valve stem. Then the valve stem can be quickly reset under the elastic action of the adjusting component, thereby improving the reset response rate of the entire control rod structure.

[0027] A second limiting protrusion 401 is provided on the outer periphery of the middle part of the valve stem 4, and the elastic reset component is abutted and limited by the second limiting protrusion 401; the outer diameter of the valve stem 4 close to the valve sleeve 7 is adapted to the inner diameter of the movable channel and a sealed sliding state is maintained between the two.

[0028] The adjusting assembly 2 includes a mounting sleeve 21, a spring seat 23, an adjusting spring 22, and a pressure-adjusting screw 24; one end of the mounting sleeve 21 is inserted into the left end cavity 101 and is threadedly connected to the valve body 1, and a third limiting protrusion 211 is integrally formed in the mounting sleeve 21, the adjusting spring 22 is located in the mounting sleeve 21 and is arranged at the left end of the third limiting protrusion 211, the spring seat 23 is arranged between the adjusting spring 22 and the third limiting protrusion 211, one end of the adjusting spring 22 abuts against the spring seat 23 and, under the action of elasticity, forces the spring seat 23 to abut against the left end wall of the third limiting protrusion 211, the other end of the adjusting spring 22 abuts against the pressure-adjusting screw 24, the pressure-adjusting screw 24 is located in the mounting sleeve 21 and is threadedly connected to the inner wall of the mounting sleeve 21; the end of the valve stem 4 close to the adjusting assembly 2 passes through the third limiting protrusion 211 and abuts against the spring seat 23.

[0029] By controlling the depth of the pressure-adjusting screw in the mounting sleeve, the elastic potential energy of the adjusting spring can be controlled, thereby setting the pressure in the oil control interface during liquid return; correspondingly, the pressure holding pressure range during pressure holding can be controlled, further improving the use effect of the pressure-wiping top moving rack.

[0030] The elastic reset assembly includes a sleeve 9, a reset spring 8, and a valve core 10. The sleeve 9, the reset spring 8, and the valve core 10 are all sleeved on the outside of the valve stem 4 and located between the second limiting convex ring 401 and the third limiting convex ring 211. One end of the reset spring 8 abuts against the valve core 10 and, under the elastic action, forces the valve core 10 to abut against the first limiting convex ring 108 to achieve a blocking sealing effect between the left end cavity 101 and the middle cavity 102; the valve core 10 is arranged on one side of the second limiting convex ring 401 and is slidingly connected to the valve stem 4; the other end of the reset spring 8 abuts against the sleeve 9 that is clamped and connected to the outside of the valve stem 4, and the outer wall of the sleeve 9 is slidingly connected to the inner wall of the mounting sleeve 21 and an avoidance gap 901 is provided between the end of the sleeve 9 away from the reset spring 8 and the third limiting convex ring 211.

[0031] The elastic reset assembly is mainly used for the oil inlet operation during the column lifting action, and the connection state between the left end cavity and the middle cavity is controlled by moving the valve core position; at the same time, when returning the liquid, due to the setting of the avoidance gap, the valve stem will drive the elastic reset assembly to move to the left together. Therefore, in this process, the pressure in the oil control interface only needs to be greater than the elastic force of the adjusting spring, and does not need to be greater than the sum of the elastic forces of the adjusting spring and the reset spring. This design makes it only necessary to determine the elastic force of the adjusting spring when setting the pressure in the oil control interface. At the same time, when the pressure in the oil control interface needs to be adjusted, it is only necessary to adjust the elastic force of the adjusting spring through the pressure regulating screw; its control is more precise and the operation is more convenient, which further improves the use effect of the present utility model.

[0032] The valve body structure in the utility model is connected to the oil cylinder to realize the oil circuit, which can make the hydraulic support enter the pressure maintaining state during the frame moving process, so that the support top beam keeps contact and support on the top plate, and maintains a certain system pressure to complete the pressure-wiping top moving.

[0033] The hydraulic support adopts the pressure-shifting technology when advancing the underground working face, which can always support the roof during the shifting process. It can effectively prevent the unstable roof from breaking and collapsing, and ensure the safe operation of the underground coal mining working face. When the pressure-shifting technology is used to advance the coal mining working face, during the shifting process, the top beam of the hydraulic support never separates from the roof, maintaining a certain supporting force on it, avoiding repeated support of the hydraulic support on the roof, slowing down the extension of cracks in the roof and preventing it from breaking, ensuring safe and effective production of the working face.

[0034] When the utility model is in normal liquid filling, the hydraulic oil in the pump station enters the middle cavity from the oil inlet port and squeezes the valve core away from the first limit convex ring, so that the hydraulic oil comes out from the oil return port and enters the lower cavity of the column, realizing the column lifting action of the bracket. After the column lifting action is completed, under the action of the reset spring, the valve core returns to its original position, and the left end cavity and the middle cavity are in a partition state;

[0035] When returning the liquid, there is a high-pressure load on the oil control interface (i.e., the upper cavity of the column), and the high-pressure hydraulic oil pushes the ejector rod, ejector pin, valve stem, and elastic reset assembly to move to the left together. At this time, the spring seat squeezes the adjusting spring, and the adjusting spring is in a contracted state. The valve core moves away from the first limit convex ring, and the left end cavity is connected with the middle cavity. The high-pressure oil in the lower cavity of the column flows back to the oil inlet port through the oil return port, realizing the column lowering action of the bracket. After the column lowering action is completed, the ejector rod, ejector pin, valve stem, and elastic reset assembly return to their original positions under the elastic action of the adjusting spring.

[0036] When the pressure-maintaining frame is moved, during the normal liquid return process, the pilot control port is allowed to flow in, and the oil enters the central cavity inside the valve sleeve through the connecting oil path, and then connects with the oil return port through the pressure-maintaining control port; at this time, the oil in the central cavity will squeeze the ejector rod to the right end and block the oil control interface. After the pressure of the high-pressure liquid in the oil control interface is lost, the elastic action of the regulating spring quickly pushes the valve stem, ejector pin, and elastic reset assembly to return to their original position. After the valve core returns to its original position, the connection between the left end cavity and the middle cavity is cut off. The entire valve body is in a pressure-maintaining state, which has a certain supporting force on the ejector plate during the frame moving operation;

[0037] The frame-shifting valve structure in the utility model is a multi-component assembled structure, which can be quickly disassembled and assembled, and is convenient for the later maintenance of the valve body. At the same time, the split structural design of the valve stem and the push rod can first seal the oil control interface through the push rod when performing the pressure maintaining operation, which greatly reduces the movement resistance of the valve stem, so that the valve stem can drive the elastic reset component to quickly return to its original position under the action of the adjusting spring, thereby achieving a rapid response effect, effectively improving the pressure maintaining action response rate of the pressure-wiping frame-shifting valve, and further improving the use effect of the utility model.

Claims

1. A pressure-operated top-moving frame valve, comprising a valve body, characterized in that: The cam body is provided with a movable channel which runs horizontally through the valve body, and the interior of the movable channel is divided into a left end cavity, a middle cavity and a right end cavity from left to right. A first limiting convex ring is provided on the inner wall of the movable channel between the left end cavity and the middle cavity, and a valve sleeve is embedded on the inner wall of the movable channel between the middle cavity and the right end cavity, and a central cavity is provided inside the valve sleeve; a side wall of one side of the left end cavity is provided with an oil return port connected to the outside world, a side wall of one side of the middle cavity is provided with an oil inlet port connected to the outside world, and side walls of the right end cavity are respectively provided with a pilot control port and a pressure holding control port connected to the outside world, and oil communication passages are provided on both side walls of the valve sleeve, and the central cavity is connected to the pilot control port and the pressure holding control port through the oil communication passage, and the pressure holding control port is connected to the oil return port; a control lever mechanism is provided in the movable channel, and the control lever mechanism is slidably connected to the movable channel and controls the communication state between the oil return port, the oil inlet port, the pilot control port and the pressure holding control port through a sliding action.

2. The pressure-wiping top-moving frame valve according to claim 1, characterized in that: The control lever mechanism includes a valve stem, an ejector pin, an ejector rod, and an elastic reset assembly; the valve stem, the ejector pin, and the ejector rod are coaxially arranged, and the end of the left end cavity away from the middle cavity is detachably connected to the adjusting assembly; one end of the valve stem is located in the left end cavity and abuts against the adjusting assembly, the other end of the valve stem extends into the middle cavity and abuts against one end of the ejector pin, and the other end of the ejector pin extends into the central cavity of the valve sleeve; the elastic reset assembly is located in the left end cavity and connected to the valve stem; an oil control interface is detachably connected to the right end cavity, and a ejector rod is slidably connected to the oil control interface, and the end of the ejector rod close to the valve sleeve extends into the central cavity inside the valve sleeve and abuts against the end of the ejector pin.

3. The pressure-wiping top-moving frame valve according to claim 2, characterized in that: A second limiting convex ring is provided on the outer periphery of the middle part of the valve stem, and the elastic reset component is abutted and limited by the second limiting convex ring; the outer diameter of the valve stem near the valve sleeve end is adapted to the inner diameter of the movable channel and a sealed sliding state is maintained between the two.

4. The pressure-wiping top-moving frame valve according to claim 3, characterized in that: The adjusting assembly includes a mounting sleeve, a spring seat, an adjusting spring, and a pressure-adjusting screw; one end of the mounting sleeve is inserted into the left end cavity and is threadedly connected to the valve body; a third limiting convex ring is integrally formed in the mounting sleeve; the adjusting spring is located in the mounting sleeve and is arranged at the left end of the third limiting convex ring; one end of the adjusting spring abuts against the spring seat and, under the action of elasticity, forces the spring seat to abut against the left end wall of the third limiting convex ring; the other end of the adjusting spring abuts against the pressure-adjusting screw; the pressure-adjusting screw is located in the mounting sleeve and is threadedly connected to the inner wall of the mounting sleeve; the end of the valve stem close to the adjusting assembly passes through the third limiting convex ring and abuts against the spring seat.

5. The pressure-wiping top-moving frame valve according to claim 4, characterized in that: The elastic reset assembly includes a sleeve, a reset spring, and a valve core. The sleeve, reset spring, and valve core are all sleeved on the outside of the valve stem and located between the second limit convex ring and the third limit convex ring. One end of the reset spring abuts against the valve core and, under the action of elasticity, forces the valve core to abut against the first limit convex ring to achieve a blocking and sealing effect between the left end cavity and the middle cavity; the valve core is arranged on one side of the second limit convex ring and is slidably connected to the valve stem; the other end of the reset spring abuts against the sleeve that is clamped and connected to the outside of the valve stem, the outer wall of the sleeve is slidably connected to the inner wall of the mounting sleeve, and an avoidance gap is provided between the end of the sleeve away from the reset spring and the third limit convex ring.

6. The pressure-wiping top-moving frame valve according to claim 5, characterized in that: The inner wall of the oil control interface is provided with a stepped structure, and the push rod is slidably connected to the inner wall of the oil control interface and, under the elastic action of the adjusting spring, pushes the push rod through the spring seat, the valve stem, and the push pin to abut against the stepped structure inside the oil control interface, thereby achieving the blocking of the oil control interface.

7. The pressure-wiping top-moving frame valve according to claim 6, characterized in that: The valve sleeve is slidably connected to the ejector pin and the ejector rod to maintain their sealing performance.

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