Automatic impact reducing valve for fully-mechanized coal mining hydraulic support of coal mine

Abstract

The automatic impact reducing valve comprises a main valve body, an electromagnetic pilot valve arranged on the main valve body and a valve element assembly arranged in a first valve cavity of the main valve body, and the electromagnetic pilot valve is arranged to be used for adjusting the opening degree of the valve element assembly. The main valve body is used for being connected with a hydraulic cylinder of a coal mine fully-mechanized mining hydraulic support. According to the automatic impact reducing valve for the fully-mechanized coal mining hydraulic support, through cooperation of the electromagnetic pilot valve and the valve element assembly, the function of reducing the starting impact of a hydraulic cylinder is achieved, and when the automatic impact reducing valve is used in the fully-mechanized coal mining hydraulic support, hydraulic impact generated when the hydraulic cylinder is started can be reduced, and the pressure and flow of a working oil port are stabilized.

Description

Technical Field

[0001] This invention belongs to the technical field of hydraulic supports for fully mechanized coal mining. Specifically, this invention relates to an automatic anti-flush valve for hydraulic supports for fully mechanized coal mining. Background Technology

[0002] Chinese Patent Application No. 202420982677.9 discloses an electric backwash filter for hydraulic supports, relating to the field of backwash filter technology. It includes a valve body containing a valve string, a filter element, and an electromagnetic pilot valve. The electromagnetic pilot valve controls the operation of the valve string. The valve body is equipped with an injection port, a drain port, and a debris discharge port. The key feature is that a pressure sensor is installed on the valve body, and the pressure sensor is electrically connected to the controller of the hydraulic support. This electric backwash filter for hydraulic supports, through the coordinated arrangement of the support controller, main and auxiliary solenoid valves, valve string, and pressure sensor, can monitor the pressure difference across the filter element in real time and automatically perform backwash filtration, extending the filter element's service life, ensuring the filter element's filtration capacity remains within the normal range, monitoring the actual usage of the filter element, and reminding personnel to replace the filter element in a timely manner, thereby ensuring system stability and improving coal mining efficiency.

[0003] In fully mechanized coal mining operations, hydraulic supports, as core equipment, are crucial for ensuring mining safety and efficiency. Among these, hydraulic cylinders are key actuators that enable actions such as pushing and pulling the hydraulic supports. However, when a hydraulic cylinder starts, the sudden change in hydraulic oil flow rate can easily generate a strong impact, a problem particularly prominent in the pushing and pulling operations of high-end supports.

[0004] While conventional hydraulic valves (such as ordinary directional valves and pressure reducing valves) are used for pressure control in hydraulic systems, there is a lack of precise and efficient solutions for the impact characteristics of hydraulic cylinders during startup in coal mine fully mechanized hydraulic supports. Ordinary hydraulic valves cannot quickly and adaptively adjust to the sudden pressure changes during hydraulic cylinder startup, and therefore cannot effectively reduce the impact energy.

[0005] An automatic shock-reducing valve is provided, particularly concerning how to reduce the starting shock of a hydraulic cylinder. Summary of the Invention

[0006] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides an automatic shock-reducing valve for hydraulic supports in fully mechanized coal mining, the purpose of which is to reduce the starting impact of the hydraulic cylinder in the fully mechanized coal mining hydraulic support.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an automatic anti-flush valve for a fully mechanized hydraulic support in a coal mine, comprising a main valve body, an electromagnetic pilot valve disposed on the main valve body, and a valve core assembly disposed in a first valve chamber of the main valve body. The electromagnetic pilot valve is configured to adjust the opening degree of the valve core assembly, and the main valve body is configured to connect with the hydraulic cylinder of the fully mechanized hydraulic support in a coal mine.

[0008] The valve core assembly includes a threaded sleeve, a valve sleeve connected to the threaded sleeve, a valve core movably disposed inside the valve sleeve, and a valve seat cooperating with the valve core. The valve body is provided with an inlet and a working inlet. The inlet and the valve sleeve are arranged opposite to each other. The inlet and the inner cavity of the valve sleeve are connected through a first liquid passage. The working inlet is connected to a first liquid passage hole provided on the side wall of the valve sleeve. The first liquid passage hole is connected to the inner cavity of the valve sleeve. The electromagnetic pilot valve is connected to the first valve cavity through a first pilot oil passage provided in the main valve body.

[0009] Multiple first liquid passages are provided.

[0010] The end of the valve core is provided with a second liquid passage for guiding liquid from the first liquid passage to the inner cavity of the valve sleeve.

[0011] The second liquid passage includes a second liquid passage hole and a third liquid passage hole. The second liquid passage hole communicates with the first liquid passage, and the third liquid passage hole communicates with the inner cavity of the valve sleeve.

[0012] The second liquid passage extends along the axial direction of the valve core, and the third liquid passage extends radially from the inner surface of the second liquid passage to the outer surface of the valve core.

[0013] Multiple third liquid passages are provided, and all third liquid passages are distributed around the second liquid passage, which is located at the center of the valve core.

[0014] A filter assembly is installed in the second valve chamber of the main valve body. The second valve chamber is connected to the first liquid passage through a filter oil passage installed in the main valve body. The electromagnetic pilot valve is connected to the second valve chamber through a second pilot oil passage installed in the main valve body. The liquid filtered by the filter assembly enters the electromagnetic pilot valve through the second pilot oil passage.

[0015] The filter assembly includes a first connector and a second connector disposed opposite to each other, and a filter screen disposed between the first connector and the second connector.

[0016] The first connector is threaded to the main valve body, and the two ends of the filter screen are bonded to the first connector and the second connector, respectively.

[0017] This invention relates to an automatic shock-reducing valve for hydraulic supports in fully mechanized coal mining. Through the cooperation of an electromagnetic pilot valve and a valve core assembly, it has the function of reducing the hydraulic cylinder starting impact. When used in fully mechanized coal mining hydraulic supports, it can reduce the hydraulic shock during hydraulic cylinder startup and stabilize the pressure and flow rate of the working oil port. Attached Figure Description

[0018] This manual includes the following figures, which illustrate the following:

[0019] Figure 1 This is a schematic diagram of the automatic anti-flush valve for hydraulic supports in coal mines according to the present invention;

[0020] Figure 2 This is a schematic diagram of the main valve.

[0021] Figure 3 yes Figure 2 Sectional view of AA;

[0022] Figure 4 yes Figure 2 BB section view;

[0023] Figure 5 This is a cross-sectional view of the valve core assembly;

[0024] Figure 6 This is a cross-sectional view of the valve core;

[0025] Figure 7 This is a functional symbol diagram of an automatic damping valve;

[0026] The following are marked in the diagram: 1. Main valve body; 2. Solenoid pilot valve; 3. Screw sleeve; 4. Valve sleeve; 5. Valve core; 6. Valve seat; 7. First liquid passage; 8. First liquid passage hole; 9. Second liquid passage hole; 10. Third liquid passage hole; 11. First connecting piece; 12. Second connecting piece; 13. Filter screen. Detailed Implementation

[0027] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0028] It should be noted that in the following embodiments, the terms "first," "second," and "third" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution; they are merely for the convenience of description.

[0029] like Figures 1 to 6As shown, the present invention provides an automatic anti-flush valve for a fully mechanized hydraulic support in a coal mine, comprising a main valve body 1, an electromagnetic pilot valve 2 disposed on the main valve body 1, and a valve core assembly disposed in a first valve chamber of the main valve body 1. The electromagnetic pilot valve 2 is configured to adjust the opening of the valve core assembly. The main valve body 1 is configured to connect to a directional valve of the fully mechanized hydraulic support in a coal mine. The directional valve is connected to the hydraulic cylinder of the fully mechanized hydraulic support in a coal mine. The electromagnetic pilot valve 2 is fixedly installed on the main valve body 1.

[0030] Specifically, such as Figures 1 to 6 As shown, the main valve body 1 is provided with an inlet PA and a working port A, which are located on two surfaces of the main valve body 1. Liquid enters the main valve body 1 through the inlet PA, and liquid inside the main valve body 1 is discharged through the working port A. The working port A is connected to the reversing valve of the hydraulic support of the coal mine through a hydraulic pipeline. The valve core assembly includes a threaded sleeve 3, a valve sleeve 4 connected to the threaded sleeve 3, a movable valve core disposed inside the valve sleeve 4, and a valve seat 6 that cooperates with the valve core. The threaded sleeve 3, valve sleeve 4, valve core, and valve seat 6 are coaxially arranged. The inlet PA and the valve sleeve 4 are arranged opposite to each other, and the inlet PA and the inner cavity of the valve sleeve 4 are connected by a first liquid passage 7, which is located between the inlet PA and the first valve cavity. The working fluid port A is connected to the first fluid passage 8 provided on the side wall of the valve sleeve 4. The first fluid passage 8 is connected to the inner cavity of the valve sleeve 4. The electromagnetic pilot valve 2 is connected to the first valve cavity through the first pilot oil passage provided in the main valve body 1.

[0031] like Figure 3 and Figure 5 As shown, the valve sleeve 4 is a cylinder with open ends and a hollow interior. A threaded sleeve 3 is connected to one end of the valve sleeve 4 and is threaded to the main valve body 1. The threaded sleeve 3 has external threads. The valve sleeve 4 is sandwiched between the threaded sleeve 3 and a stepped surface within the first valve cavity. The valve core is located within the inner cavity of the valve sleeve 4, which has a stepped surface for axially limiting the valve core. The valve seat 6 is installed in the other end opening of the valve sleeve 4. The valve seat 6 cooperates with the valve core to achieve a seal. The head of the valve core has a sealing cone surface for contacting the valve seat 6. The valve seat 6 has a circular annular structure with a central hole at its center to accommodate the valve core. The diameter of the central hole is smaller than the outer diameter of the valve core. Both the valve core and valve seat 6 are made of metal, specifically 3Cr13. The valve core and valve seat 6 have a hard seal connection, enhancing the sealing performance. Compared to soft material seals, hard seals not only have better sealing performance but can also withstand ultra-high pressure, resulting in a longer service life for the pressure relief valve.

[0032] like Figure 3 and Figure 5As shown, the first fluid passage 8 is a through hole formed in the annular sidewall of the valve sleeve 4. Multiple first fluid passages 8 are provided, located between the valve seat 6 and the threaded sleeve 3. The oil entering the valve seat 6 through the first fluid passage 7 pushes the valve core towards the threaded sleeve 3, causing the valve core to separate from the valve seat 6. After the valve core is completely separated from the valve seat 6, the automatic damping valve is at its maximum opening, and the fluid flow rate of the automatic damping valve is at its maximum. The fluid exiting the automatic damping valve enters the hydraulic cylinder through the reversing valve.

[0033] like Figure 3 and Figure 5 As shown, the end of the valve core is provided with a second liquid passage for guiding liquid from the first liquid passage 7 to the inner cavity of the valve sleeve 4. The second liquid passage includes a second liquid passage hole 9 and a third liquid passage hole 10. The diameters of the second liquid passage hole 9 and the third liquid passage hole 10 are smaller than the diameter of the central hole of the valve seat 6. The second liquid passage hole 9 communicates with the first liquid passage 7, and the third liquid passage hole 10 communicates with the inner cavity of the valve sleeve 4. The second liquid passage hole 9 extends axially along the valve core, and the third liquid passage hole 10 extends radially from the inner surface of the second liquid passage hole 9 to the outer surface of the valve core. Multiple third liquid passage holes 10 are provided, all of which are distributed around the second liquid passage hole 9, which is located at the center of the valve core. The second liquid passage 9 extends axially from the end face of the valve core facing the first liquid passage 7 into the interior of the valve core. The second liquid passage 9 is located at the center of the valve core and is coaxial with the valve seat 6. All the third liquid passages 10 are evenly distributed circumferentially with the axis of the second liquid passage 9 as the center line.

[0034] The electromagnetic pilot valve 2 delivers liquid to the first valve chamber of the main valve body 1 through the first pilot oil passage. The liquid in the first valve chamber enters the inner cavity of the valve sleeve 4 through the control hole provided on the annular side wall of the threaded sleeve 3. The control hole provided on the annular side wall of the threaded sleeve 3 is connected to the inner cavity of the threaded sleeve 3. The inner cavity of the threaded sleeve 3 is connected to the inner cavity of the valve sleeve 4, so that the liquid enters the tail of the valve core (the head and tail of the valve core are the two ends of the valve core in the axial direction), applies hydraulic pressure to the valve core, and pushes the valve core to move axially toward the valve seat 6. Finally, the sealing cone surface of the head of the valve core contacts the valve seat 6. At this time, the automatic de-flushing valve is in the minimum opening state, and the liquid in the first liquid passage 7 can only enter the inner cavity of the valve sleeve 4 through the second liquid passage.

[0035] Therefore, after the valve core contacts the valve seat 6, the second liquid passage 9 is used to guide the liquid from the first liquid passage 7 to the third liquid passage 10. The liquid in the second liquid passage 9 enters the third liquid passage 10, and the liquid in the third liquid passage 10 finally enters the inner cavity of the valve sleeve 4. At this time, the liquid can only enter the inner cavity of the valve sleeve 4 through the second liquid passage, and then enter the working liquid port through the first liquid passage 8. The automatic de-flushing valve is in the minimum opening state.

[0036] The automatic anti-impact valve with the above structure, through the cooperation of the electromagnetic pilot valve 2 and the valve core assembly, has the function of reducing the hydraulic cylinder starting impact. When used in the hydraulic support of fully mechanized coal mining, it can reduce the hydraulic impact when the hydraulic cylinder starts and stabilize the pressure and flow of the working oil port.

[0037] During operation, the system detects signals such as directional valve action and hydraulic cylinder start / stop. When the triggering conditions are met, the solenoid pilot valve 2 is energized. The solenoid pilot valve 2 delivers liquid to the first valve chamber of the main valve body 1 through the first pilot oil passage, controls the valve core to move, reduces the opening of the automatic anti-flush valve, weakens the impact energy generated by the hydraulic cylinder impact pressure through throttling, and avoids the impact from being transmitted to downstream components. This reduces the impact energy input from the "source" and ensures stable working oil port pressure.

[0038] like Figures 1 to 4 As shown, a filter assembly is installed in the second valve chamber of the main valve body 1. The filter assembly filters the oil. The second valve chamber is connected to the first liquid passage 7 through the filter oil passage installed in the main valve body 1. The electromagnetic pilot valve 2 is connected to the second valve chamber through the second pilot oil passage installed in the main valve body 1. The liquid filtered by the filter assembly enters the electromagnetic pilot valve 2 through the second pilot oil passage.

[0039] like Figure 4 As shown, the filter assembly includes a first connector 11 and a second connector 12 disposed opposite to each other, and a filter screen 13 disposed between the first connector 11 and the second connector 12. The filter screen 13 is used to filter liquid. The first connector 11 is threadedly connected to the main valve body 1, and the first connector 11 is provided with an external thread. The first connector 11, the filter screen 13, and the second connector 12 are coaxially arranged. A protrusion is provided at the center of the first connector 11. The protrusion is a hollow cylindrical structure. Filter holes for liquid to pass through are provided on the annular sidewall of the protrusion. The filter screen 13 is sleeved on the protrusion. The central hole of the protrusion is connected to the second pilot oil passage. Multiple filter holes are provided, densely distributed on the annular sidewall of the protrusion, and distributed around the central hole of the protrusion. The filter holes are connected to the central hole of the protrusion. Liquid filtered by the filter screen 13 enters the central hole of the protrusion and finally flows into the solenoid pilot valve 2 through the second pilot oil passage. The second connector 12 has a mounting hole at its center for inserting the protrusion on the first connector 11. The mounting hole is a threaded hole, and the protrusion is threadedly connected to the second connector 12. The two ends of the filter screen 13 are bonded to the first connector 11 and the second connector 12 respectively, forming a complete filter core.

[0040] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An automatic anti-flush valve for hydraulic supports in fully mechanized coal mining, characterized in that: It includes a main valve body, an electromagnetic pilot valve disposed on the main valve body, and a valve core assembly disposed in the first valve chamber of the main valve body. The electromagnetic pilot valve is configured to adjust the opening degree of the valve core assembly, and the main valve body is configured to connect with the hydraulic cylinder of the fully mechanized coal mining hydraulic support.

2. The automatic damping valve according to claim 1, characterized in that: The valve core assembly includes a threaded sleeve, a valve sleeve connected to the threaded sleeve, a valve core movably disposed inside the valve sleeve, and a valve seat cooperating with the valve core. The valve body is provided with an inlet and a working inlet. The inlet and the valve sleeve are arranged opposite to each other. The inlet and the inner cavity of the valve sleeve are connected through a first liquid passage. The working inlet is connected to a first liquid passage hole provided on the side wall of the valve sleeve. The first liquid passage hole is connected to the inner cavity of the valve sleeve. The electromagnetic pilot valve is connected to the first valve cavity through a first pilot oil passage provided in the main valve body.

3. The automatic damping valve according to claim 2, characterized in that: Multiple first liquid passage holes are provided.

4. The automatic damping valve according to claim 2, characterized in that: The end of the valve core is provided with a second liquid passage for guiding liquid from the first liquid passage to the inner cavity of the valve sleeve.

5. The automatic damping valve according to claim 4, characterized in that: The second liquid passage includes a second liquid passage hole and a third liquid passage hole. The second liquid passage hole communicates with the first liquid passage, and the third liquid passage hole communicates with the inner cavity of the valve sleeve.

6. The automatic damping valve according to claim 5, characterized in that: The second liquid passage extends along the axial direction of the valve core, and the third liquid passage extends radially from the inner surface of the second liquid passage to the outer surface of the valve core.

7. The automatic damping valve according to claim 6, characterized in that: Multiple third liquid passages are provided, and all third liquid passages are distributed around the second liquid passage, which is located at the center of the valve core.

8. The automatic damping valve according to any one of claims 2 to 7, characterized in that: A filter assembly is installed in the second valve chamber of the main valve body. The second valve chamber is connected to the first liquid passage through a filter oil passage installed in the main valve body. The electromagnetic pilot valve is connected to the second valve chamber through a second pilot oil passage installed in the main valve body. The liquid filtered by the filter assembly enters the electromagnetic pilot valve through the second pilot oil passage.

9. The automatic damping valve according to claim 8, characterized in that: The filter assembly includes a first connector and a second connector disposed opposite to each other, and a filter screen disposed between the first connector and the second connector.

10. The automatic damping valve according to claim 8, characterized in that: The first connector is threaded to the main valve body, and the two ends of the filter screen are bonded to the first connector and the second connector, respectively.

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