Unloading valve for hydraulic support

Abstract

The present invention discloses a hydraulic support unloading valve, comprising: a valve body, having a high-pressure chamber, a return liquid chamber and a control chamber, one end of the high-pressure chamber is a liquid inlet, and the other end is interconnected with the control chamber, one end of the return liquid chamber is connected with the control chamber, and the other end extends to the outside of the valve body; a valve core is arranged in the high-pressure chamber, one end of which is an elastic member, and the other end is a valve ball arranged corresponding to the control chamber, and a sealing surface for blocking the high-pressure chamber, the control chamber, and the return liquid chamber is arranged between the valve ball and the valve body; and a control component, wherein, when unloading, the plugging seat is screwed to make the push rod push the valve ball and destroy the sealing surface, so that the liquid in the high-pressure chamber is discharged to the outside of the valve body through the control chamber and the return liquid chamber. The present invention is ingenious in design, convenient in installation, easy to operate, and can effectively ensure the safety of personnel and equipment in the coal mining process and ensure the comprehensive mining efficiency under the mine.

Description

Technical Field

[0001] The invention relates to the technical field of control valves for coal mine hydraulic supports, in particular to an unloading valve for a hydraulic support. Background Art

[0002] The hydraulic support under coal mine is the key equipment of fully mechanized mining working face. As an important hydraulic component of the hydraulic support, the performance of the hydraulic control valve directly determines the safety and reliability of the hydraulic support. Under normal circumstances, the hydraulic pump station controls the lifting of the column through the column control valve. However, due to some reasons, when the hydraulic pump station suddenly stops supplying fluid, the lower cavity of the column cannot unload and lower the column in time, resulting in safety hazards, and safety and reliability cannot be guaranteed. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a hydraulic support unloading valve, which can specifically adopt the following technical solutions:

[0004] The unloading valve for the hydraulic support of the present invention comprises:

[0005] The valve body has a high-pressure chamber, a return liquid chamber and a control chamber, one end of the high-pressure chamber is a liquid inlet, and the other end is connected to the control chamber, one end of the return liquid chamber is connected to the control chamber, and the other end extends to the outside of the valve body;

[0006] A valve core is arranged in the high-pressure chamber, one end of which is an elastic member, and the other end is a valve ball arranged corresponding to the control chamber, and a sealing surface for blocking the high-pressure chamber and the control chamber and the liquid return chamber is arranged between the valve ball and the valve body;

[0007] Control components, including

[0008] A blocking seat is arranged at one end of the control chamber, the blocking seat is threadedly connected to the outer wall of the valve body, and a sealing structure is arranged between the valve body and the blocking seat;

[0009] A push rod is arranged in the control chamber and located between the valve ball and the blocking seat;

[0010] When unloading, the sealing seat is screwed to make the push rod push the valve ball and destroy the sealing surface, so that the liquid in the high-pressure chamber is discharged to the outside of the valve body through the control chamber and the return liquid chamber.

[0011] The high pressure chamber and the control chamber are coaxially arranged.

[0012] The valve body comprises:

[0013] A valve housing having the high-pressure chamber at the left end and a mounting chamber at the right end;

[0014] a valve seat, located at the left end of the installation cavity and sealedly connected to the installation cavity; and

[0015] A screw plug, used to fix the valve seat, is located at the right end of the valve seat and is screwed to the installation cavity;

[0016] Wherein, the control chamber is a longitudinal hole penetrating the valve seat and the screw plug, and the liquid return chamber is a radial hole penetrating the screw plug and the valve housing.

[0017] The liquid return chamber also includes an annular chamber formed by the screw plug and the valve housing being spaced apart.

[0018] The push rod is a stepped rod with a small left side and a large right side, and the longitudinal hole is a stepped hole matched with the push rod.

[0019] The left end of the valve seat is provided with an arc-shaped concave groove matched with the valve ball.

[0020] The high-pressure chamber is a stepped hole with a small left side and a large right side. The elastic member includes a compression spring clamped on the large end of the high-pressure chamber and a spring seat arranged between the compression spring and the valve ball.

[0021] The spring seat is a T-shaped cap, the left end of which is arranged in the spring coil of the compression spring, and the right end surface has an arc surface structure adapted to the valve ball.

[0022] The sealing structure is a sealing ring arranged on the right end surface of the valve body.

[0023] An annular groove is arranged on the outer side of the shell, and an anti-dropping rod located in the annular groove is arranged on the blocking seat.

[0024] The unloading valve for the hydraulic support provided by the present invention is cleverly designed, easy to install and easy to operate. It is usually located on the pipeline between the lower cavity of the hydraulic support column and the control valve. When the hydraulic pump station stops supplying fluid and the lower cavity of the column cannot unload and lower the column in time, the present invention can conveniently perform manual unloading, effectively ensuring the safety of personnel and equipment during coal mining and ensuring the comprehensive mining efficiency in the mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a schematic diagram of the hydraulic principle of the present invention during use. DETAILED DESCRIPTION

[0027] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific working process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0028] The unloading valve for the hydraulic support described in the present invention comprises a valve body, a valve core and a control assembly, the above-mentioned valve body has a high-pressure chamber, a return liquid chamber and a control chamber, one end of the high-pressure chamber is a liquid inlet, and the other end is interconnected with the control chamber, one end of the return liquid chamber is connected with the control chamber, and the other end extends to the valve body; the valve core is installed in the high-pressure chamber, one end of which is an elastic member, and the other end is a valve ball arranged corresponding to the control chamber, and a sealing surface for blocking the high-pressure chamber, the control chamber and the return liquid chamber is provided between the valve ball and the valve body; the control assembly comprises a blocking seat and a push rod, the blocking seat is installed at one end of the control chamber, it is screwed and connected to the outer wall of the valve body, and a sealing structure located between the valve body and the blocking seat is installed; the push rod is located in the control chamber, and is arranged between the valve ball and the blocking seat; when unloading, the blocking seat is screwed to make the push rod push the valve ball and destroy the sealing surface, so that the liquid in the high-pressure chamber is discharged to the outside of the valve body through the control chamber and the return liquid chamber.

[0029] Specifically, Figure 1 , 2 As shown, the valve body is composed of a valve shell 1, a valve seat 2 and a screw plug 3, wherein a liquid inlet P is provided at the left end of the valve shell 1, and a stepped hole is connected thereto, which is through-set from left to right. The left section of the stepped hole is a high-pressure chamber 4, and the right section is a mounting chamber, and the inner diameter of the mounting chamber is larger than the inner diameter of the high-pressure chamber 4 at the connection. The valve seat 2 is clamped at the left end of the mounting chamber and is sealed with the valve shell 1 through a sealing ring on the outer wall; the screw plug 3 is screwed in from the right end of the mounting chamber and is fixed in position against the valve seat 2. A longitudinal hole is provided through-set at the center of the valve seat 2 and the screw plug 3 as a control chamber 5, and the control chamber 5 is coaxially arranged with the high-pressure chamber 4; secondly, the left end of the screw plug 3 and the housing 1 are spaced to form an annular chamber, and at the same time, a plurality of radial holes connected to the longitudinal hole are provided on the screw plug 2, and a plurality of radial holes leading to the outside of the valve body are provided on the housing 1, thereby forming a liquid return chamber 6.

[0030] The valve core is composed of a compression spring 7, a spring seat 8 and a ceramic valve ball 9, which is installed in the high-pressure chamber 4. Specifically, the high-pressure chamber 4 is also a stepped hole with a small left side and a large right side. The compression spring 7 is clamped on the large head end of the stepped hole. The right end of the compression spring 7 is plugged with a spring seat 8. The spring seat 8 is a T-shaped cap structure, and a ceramic valve ball 9 is installed between its right end face and the valve seat 2. In order to position the valve ball 9 well, an arc surface structure adapted to the valve ball 9 is provided on the right end face of the spring seat 8, and an arc-shaped concave groove adapted to the valve ball 9 is provided on the left end of the valve seat 2. When the hydraulic support is working normally, the valve ball 9 is close to the valve seat 2 to form a sealing surface for blocking the high-pressure chamber 4 and the control chamber 5 and the return liquid chamber 6.

[0031] The control assembly includes a plugging seat 10 and a push rod 11. The plugging seat 10 is located at one end of the control chamber 5 and is connected to the outer wall of the valve housing 1 through a thread. A sealing ring is installed on the right end face of the valve housing 1. When the plugging seat 10 moves toward the liquid inlet P, the sealing ring is gradually compressed to form a sealing structure. The working medium entering the control chamber 5 from the high-pressure chamber 4 can only be discharged to the outside of the valve body from the liquid outlet O of the return liquid chamber 6. In order to prevent the plugging seat 10 from separating from the housing 1 when moving in the reverse direction, an annular groove is provided on the outer side of the housing 1, and an anti-detachment rod 12 located in the annular groove is installed on the side wall of the plugging seat 10. The push rod 11 is installed in the control chamber 5, and its two ends are respectively opposite to the valve ball 9 and the plugging seat 10. When the plugging seat 10 is screwed to move it toward the liquid inlet P, the push rod 11 moves to the left until the valve ball 9 is pushed away from the valve seat 2, the sealing surface is destroyed, and the working medium in the high-pressure chamber 4 is discharged to the outside of the valve body through the control chamber 5 and the return liquid chamber 6 to unload. Further, the push rod 11 is a stepped rod with a small left side and a large right side, with its large end facing the blocking seat 10 and its small end facing the valve ball 9, so that the valve ball 9 can be pushed away from the valve seat 2 under a small pushing force. Correspondingly, the longitudinal hole on the screw plug 3 is a stepped hole adapted to the push rod 11.

[0032] When in use, the present invention is installed on the pipeline between the lower chamber of the hydraulic support column M and the control valve N. In the initial state, the push rod 11 has no force on the valve ball 9, while the force of the left compression spring 7 and the liquid in the high-pressure chamber 4 on the valve ball 9 is greater than the force of the liquid in the right control chamber 5 on the valve ball 9, so the valve ball 9 and the valve seat 2 remain sealed; when the high-pressure chamber 4 needs to be unloaded, the plug seat 10 is rotated to push it to the left, thereby pushing the push rod 11 to move to the left. When the force of the push rod 11 on the valve ball 9 is greater than the force of the compression spring 7 and the liquid in the high-pressure chamber 4 on the valve ball 9, the valve ball 9 is separated from the valve seat 2, and the sealing surfaces of the two are destroyed. The high-pressure chamber 4 is connected with the return liquid chamber 6. The working medium entering the high-pressure chamber 4 from the liquid inlet P passes through the control chamber 5 and the return liquid chamber 6, and is released into the air from the liquid outlet O of the return liquid chamber 6. Since the operator is on the right, the liquid outlet O is located in front of the operator and the working medium there flows to the left, so it will not cause harm to the operator. After the unloading is completed, the sealing seat 10 is screwed to move rightward, and the push rod 11 no longer exerts a force on the valve ball 9, the compression spring 7 is reset, and the valve ball 9 and the valve seat 2 resume the sealing state.

[0033] It should be noted that, in the description of the present invention, terms indicating orientation or positional relationships, such as "front", "rear", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

Claims

1. A unloading valve for a hydraulic support, characterized in that: The unloading valve comprises The valve body has a high-pressure chamber, a return liquid chamber and a control chamber, one end of the high-pressure chamber is a liquid inlet, and the other end is connected to the control chamber, one end of the return liquid chamber is connected to the control chamber, and the other end extends to the outside of the valve body; A valve core is arranged in the high-pressure chamber, one end of which is an elastic member, and the other end is a valve ball arranged corresponding to the control chamber, and a sealing surface for blocking the high-pressure chamber and the control chamber and the liquid return chamber is arranged between the valve ball and the valve body; Control components, including A blocking seat is arranged at one end of the control chamber, the blocking seat is threadedly connected to the outer wall of the valve body, and a sealing structure is arranged between the valve body and the blocking seat; A push rod is arranged in the control chamber and located between the valve ball and the blocking seat; When unloading, the plugging seat is screwed to make the push rod push the valve ball and destroy the sealing surface, so that the liquid in the high-pressure chamber is discharged to the outside of the valve body through the control chamber and the return chamber; The valve body comprises A valve housing having the high-pressure chamber at the left end and a mounting chamber at the right end; a valve seat, located at the left end of the installation cavity and sealedly connected to the installation cavity; and A screw plug, used to fix the valve seat, is located at the right end of the valve seat and is screwed to the installation cavity; Wherein, the control chamber is a longitudinal hole penetrating the valve seat and the screw plug, and the liquid return chamber is a radial hole penetrating the screw plug and the valve housing; The high-pressure chamber is a stepped hole with a small left side and a large right side, and the elastic member includes a compression spring clamped at the large end of the high-pressure chamber and a spring seat arranged between the compression spring and the valve ball; An annular groove is arranged on the outer side of the valve housing, and an anti-dropping rod located in the annular groove is arranged on the blocking seat.

2. The unloading valve for hydraulic support according to claim 1, characterized in that: The high pressure chamber and the control chamber are coaxially arranged.

3. The unloading valve for hydraulic support according to claim 1, characterized in that: The liquid return chamber also includes an annular chamber formed by the screw plug and the valve housing being spaced apart.

4. The unloading valve for hydraulic support according to claim 1, characterized in that: The push rod is a stepped rod with a small left side and a large right side, and the longitudinal hole is a stepped hole matched with the push rod.

5. The unloading valve for hydraulic support according to claim 1, characterized in that: The left end of the valve seat is provided with an arc-shaped concave groove matched with the valve ball.

6. The unloading valve for hydraulic support according to claim 1, characterized in that: The spring seat is a T-shaped cap, the left end of which is arranged in the spring coil of the compression spring, and the right end surface has an arc surface structure adapted to the valve ball.

7. The unloading valve for hydraulic support according to claim 1, characterized in that: The sealing structure is a sealing ring arranged on the right end surface of the valve body.

Images