A safety valve assembly for a front beam jack

Abstract

The utility model relates to a front beam jack safety valve assembly, and the utility model wants to solve the technical problem to provide a front beam jack safety valve assembly. The utility model adopts the technical scheme: including front beam jack, stand, first reversing valve, second reversing valve, stand hydraulic control check valve, front beam safety valve, front beam jack control valve group, the front beam jack control valve group includes first hydraulic control check valve, second hydraulic control check valve and constant pressure relief valve, the A mouth of first reversing valve is communicated with the upper cavity of stand and simultaneously divides a road to come out as the control loop of stand hydraulic control check valve, the B mouth of first reversing valve is connected after entering stand hydraulic control check valve and is communicated with the lower cavity of stand. The utility model has the advantages of: avoiding the overhigh pressure due to long-term locking, being able to release part of hydraulic pressure quickly, guaranteeing the safety of front beam safety valve, and reducing the risk of frequent damage of front beam safety valve.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic support technology for fully mechanized coal mining faces, specifically to a safety valve assembly for a front beam jack. Background Technology

[0002] With the further development of hydraulic support technology in coal mine fully mechanized mining, some designs and manufacturing processes have failed to fully consider actual working conditions and workers' operating habits. For example, when the front beam elevation angle is greater than the top beam in the underground working face or when the front beam connects to the top first when raising the column, these conditions will first compress the lower chamber of the front beam jack, causing the pressure in the lower chamber of the front beam to rise to the point where the front beam safety valve opens and overflows. The front beam safety valve seal cannot withstand this abnormal repeated high-pressure unloading. This unloading situation is long-lasting and high-temperature, and there are currently no sealing rings on the market that can withstand this working condition for the front beam safety valve, which easily causes leakage of the front beam safety valve. Therefore, the front beam safety valve is often damaged. Utility Model Content

[0003] To solve the above problems, the technical problem to be solved by this utility model is to provide a safety valve assembly for a front beam jack.

[0004] The technical solution adopted by the safety valve assembly of the front beam jack of this utility model includes a front beam jack, a column, a first reversing valve for controlling the lifting and reversing of the column, a second reversing valve for controlling the extension and reversing of the front beam jack, a column hydraulic control check valve for managing the opening and closing of the column locking chamber, and a front beam safety valve. The feature is that it also includes a front beam jack control valve group, which includes a first hydraulic control check valve, a second hydraulic control check valve, and a constant pressure relief valve. Port A of the first reversing valve is connected to the upper chamber of the column and simultaneously branches off as the control circuit of the column hydraulic control check valve. Port B of the first reversing valve is connected to the column hydraulic control check valve and then to the lower chamber of the column. A branch of Port B of the first reversing valve also branches off as the control circuit of the second hydraulic control check valve.

[0005] The A port of the second reversing valve is connected to the upper cavity of the front beam jack and simultaneously branches out into two paths, which serve as the control circuits for the first hydraulic check valve and the second hydraulic check valve, respectively. The B port of the second reversing valve is connected to the lower cavity of the front beam jack after passing through the first hydraulic check valve and the second hydraulic check valve in sequence. A path is branched out from the lower cavity of the front beam jack and connected to the front beam safety valve. The constant pressure relief valve is connected in parallel to the first hydraulic check valve.

[0006] Both the first reversing valve and the second reversing valve are two-position three-way valves.

[0007] The pressure value set by the constant pressure relief valve is less than or equal to the pressure value at which the front beam safety valve opens.

[0008] The advantages of this utility model for the safety valve assembly of the front beam jack are: avoiding excessive pressure due to long-term locking, quickly releasing some hydraulic pressure, ensuring the safety of the front beam safety valve, reducing the risk of frequent damage to the front beam safety valve, and improving the reliability of system operation. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0010] Figure 1 This is a structural connection diagram of the safety valve assembly for the front beam jack of this utility model;

[0011] Figure 2 This is a schematic diagram of the structural connection principle of the front beam jack control valve group of this utility model. Detailed Implementation

[0012] like Figure 1-2 As shown, the safety valve assembly for the front beam jack of this utility model includes a front beam jack 1, a column 2, a first reversing valve 3 for controlling the lifting and reversing of the column 2, a second reversing valve 4 for controlling the extension and reversing of the front beam jack 1, a column hydraulic control check valve 5 for managing the opening and closing of the locking chamber of the column 2, a front beam safety valve 6, and a front beam jack control valve assembly 7. The front beam jack control valve assembly 7 includes a first hydraulic control check valve 10, a second hydraulic control check valve 11, and a constant pressure relief valve 12. Port A of the first reversing valve 3 is connected to the upper chamber of the column 2 and simultaneously branches off as the control circuit for the column hydraulic control check valve 5. Port B of the first reversing valve 3 is connected to the column hydraulic control check valve 5. One-way valve 5 is connected to the lower chamber of column 2. Port B of the first directional valve 3 is branched off as the control circuit of the second hydraulic control one-way valve 11. Port A of the second directional valve 4 is connected to the upper chamber of the front beam jack 1 and branches off into two circuits, which are respectively the control circuits of the first hydraulic control one-way valve 10 and the second hydraulic control one-way valve 11. Port B of the second directional valve 4 is connected to the lower chamber of the front beam jack 1 after passing through the first hydraulic control one-way valve 10 and the second hydraulic control one-way valve 11. A branch from the lower chamber of the front beam jack 1 is connected to the front beam safety valve 6. The constant pressure relief valve 12 is connected in parallel to the first hydraulic control one-way valve 10 to avoid excessive pressure due to long-term locking. It can quickly release some hydraulic pressure, ensure the safety of the front beam safety valve 6, and improve the reliability of system operation.

[0013] Both the first reversing valve 3 and the second reversing valve 4 are two-position three-way valves, which have a simplified structure, fast response speed, and more reliable switching process.

[0014] The pressure value set by the constant pressure relief valve 12 is less than or equal to the pressure value opened by the front beam safety valve 6. Through the "graded protection" method, the constant pressure relief valve 12 is prioritized to operate, thereby reducing the risk of damage and extending its service life.

[0015] Working principle: When the B port of the first reversing valve 3 supplies liquid to the lower chamber of the column 2 to raise the column, the control circuit of the second hydraulic control check valve 11 is connected, and the second hydraulic control check valve 11 is opened (the locking chamber of this device is opened). The high-pressure liquid pressure locked in the lower chamber of the front beam jack 1 decreases, and the column 2 continues to rise to the top plate of the front beam, first contacting the top and then compressing the lower chamber of the front beam jack 1. Since the second hydraulic control check valve 11 is opened, the pressure liquid in the lower chamber of the front beam jack 1 that exceeds the pressure setting value of the constant pressure relief valve 12 flows back to the liquid tank through the constant pressure relief valve 12 and then through the B port of the second reversing valve 4. Therefore, the hydraulic pressure maintained in the lower chamber of the front beam jack 1 does not reach the pressure value for opening the front beam safety valve 6, thereby protecting the front beam safety valve 6 and making it less susceptible to damage.

[0016] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model are included within the protection scope of the present utility model.

Claims

1. A safety valve assembly for a front beam jack, comprising a front beam jack (1), a column (2), a first directional valve (3) for controlling the lifting and reversing of the column (2), a second directional valve (4) for controlling the extension and reversing of the front beam jack (1), a column hydraulic control check valve (5) for managing the opening and closing of the locking chamber of the column (2), and a front beam safety valve (6), characterized in that: It also includes a front beam jack control valve group (7), which includes a first hydraulic control check valve (10), a second hydraulic control check valve (11) and a constant pressure relief valve (12). The A port of the first reversing valve (3) is connected to the upper cavity of the column (2) and simultaneously branches out as the control circuit of the column hydraulic control check valve (5). The B port of the first reversing valve (3) is connected to the column hydraulic control check valve (5) and then connected to the lower cavity of the column (2). The B port of the first reversing valve (3) branches out as the control circuit of the second hydraulic control check valve (11). The A port of the second reversing valve (4) is connected to the upper cavity of the front beam jack (1) and simultaneously branches out into two paths, which serve as the control circuits of the first hydraulic control check valve (10) and the second hydraulic control check valve (11) respectively. The B port of the second reversing valve (4) is connected to the lower cavity of the front beam jack (1) after passing through the first hydraulic control check valve (10) and the second hydraulic control check valve (11) in sequence. A path is branched out from the lower cavity of the front beam jack (1) and connected to the front beam safety valve (6). The constant pressure relief valve (12) is connected in parallel to the first hydraulic control check valve (10).

2. The safety valve assembly for the front beam jack according to claim 1, characterized in that: Both the first reversing valve (3) and the second reversing valve (4) are two-position three-way valves.

3. The safety valve assembly for the front beam jack according to claim 1, characterized in that: The pressure value set by the constant pressure relief valve (12) is less than or equal to the pressure value at which the front beam safety valve (6) opens.

Images