Electro-hydraulic control reversing valve

Abstract

The utility model relates to an electro-hydraulic control reversing valve. The technical problem to be solved by the utility model is to provide an electro-hydraulic control reversing valve. According to the technical scheme, the reversing valve comprises a reversing valve sleeve, a reversing valve seat sleeve, a reversing valve seat, a reversing valve sliding valve, a piston rod, a spring and a valve seat clamping piece, the valve seat clamping piece comprises a clamping piece connecting part and clamping piece locking parts arranged at the two ends of the clamping piece connecting part, and the clamping piece connecting part is of a semi-arc structure. A clamping piece butt joint hole is formed in the clamping piece locking part, a valve sleeve butt joint groove, a valve sleeve inner limiting groove and a valve sleeve main cavity are sequentially formed in the reversing valve sleeve, and valve sleeve locking receding openings are formed in the position, around the arc, of the valve sleeve inner limiting groove of the reversing valve sleeve at intervals. The reversing valve has the advantages that the reversing valve seat and the reversing valve sleeve are reliably connected through the valve seat clamping piece, and displacement of the reversing valve seat is effectively prevented; the first valve seat sealing ring and the second valve seat sealing ring of the reversing valve effectively improve the sealing performance of the butt joint.

Description

Technical Field

[0001] This utility model relates to an electro-hydraulic directional valve. Background Technology

[0002] In fully mechanized coal mining faces, electro-hydraulic directional control valves are essential hydraulic components for operating and controlling mine hydraulic supports. Their quality directly impacts the efficiency of the entire mining operation and can even affect safe production. Existing electro-hydraulic directional control valves include a valve sleeve, a valve seat sleeve, a valve seat, a spool valve, a piston rod, and a spring. The valve seat is housed within the valve sleeve, and the ends of the valve sleeve and valve seat are connected by threads. During actual operation, the piston rod, through the reciprocating motion of the spring, and the spool valve, along with other components, frequently contact the valve seat, causing impacts. This leads to loosening of the connection between the valve sleeve and valve seat, resulting in valve seat displacement. Ultimately, this reduces the control accuracy of the directional valve, causes leakage, and shortens the service life of the valve seat. Therefore, improvements and optimizations are proposed to address these issues. Utility Model Content

[0003] To solve the above problems, the technical problem to be solved by this utility model is to provide an electro-hydraulic directional valve.

[0004] The technical solution adopted by this utility model of electro-hydraulic directional valve is characterized by comprising a directional valve sleeve, a directional valve seat sleeve, a directional valve seat, a directional valve slide valve, a piston rod, a spring, and a valve seat retainer. The valve seat retainer includes a retainer connecting part and retainer locking parts provided at both ends of the retainer connecting part. The retainer connecting part has a semi-circular arc structure. The retainer locking part is provided with a retainer mating hole. The directional valve sleeve is provided with a valve sleeve mating groove, a valve sleeve inner limiting groove for limiting the installation of the directional valve seat, and a valve sleeve main cavity for installing the directional valve slide valve in sequence. The directional valve sleeve is provided with a valve sleeve locking clearance port at intervals around the valve sleeve inner limiting groove for mating with the retainer locking part. The retainer locking part passes through the valve sleeve locking clearance port and is fixed to the directional valve sleeve by a pin. The outer wall of the directional valve seat is provided with a valve seat retaining groove for engaging with the retainer.

[0005] It also includes a first valve seat sealing ring and a second valve seat sealing ring. The outer wall of one end of the directional valve seat is provided with an outer valve seat mounting groove. The first valve seat sealing ring is placed between the outer valve seat mounting groove and the inner limiting groove of the valve sleeve. The inner wall of the bottom of the valve sleeve mating groove is provided with an inner valve sleeve positioning groove. The second valve seat sealing ring is placed on the inner positioning groove of the valve sleeve.

[0006] The reversing valve seat is provided with a seat connecting boss. The width of the reversing valve seat is greater than the depth of the limiting groove inside the valve sleeve. The end of the seat connecting boss abuts against the side of the reversing valve seat.

[0007] It also includes a reinforcing screw. The inner wall of the valve sleeve mating groove is provided with valve sleeve internal thread and valve sleeve threaded holes spaced around the arc outside the valve sleeve internal positioning groove. The outer wall of the seat sleeve connecting boss is provided with seat sleeve external thread and seat sleeve anti-slip groove from the outside to the inside, which are threaded to the valve sleeve internal thread. After the reinforcing screw is threaded to the valve sleeve threaded hole, its bottom end is placed in the seat sleeve anti-slip groove.

[0008] The directional valve slide valve is provided with the piston rod, and the right end of the piston rod is fitted with the spring. When the directional valve slide valve slides to the right and contacts the directional valve seat, it forms a stepped surface seal. When the piston rod slides to the left and contacts the directional valve seat, it forms a conical surface seal.

[0009] The advantages of this electro-hydraulic directional valve are as follows: the valve seat retainer ensures a reliable connection between the directional valve seat and the directional valve sleeve, effectively preventing displacement of the directional valve seat; the first and second sealing rings of the directional valve seat are respectively set at both ends of the valve seat mating point, effectively improving the sealing performance at the mating point; and the reinforcing screws effectively prevent loosening at the threaded connection between the directional valve sleeve and the directional valve seat sleeve, further improving the tightness and safety of the connection. Attached Figure Description

[0010] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0011] Figure 1 This is a half-sectional view of the electro-hydraulic directional valve of this utility model;

[0012] Figure 2 This is a structural schematic diagram of the valve seat clip of this utility model;

[0013] Figure 3 This is a schematic diagram of the structure of the valve sleeve of the directional valve of this utility model;

[0014] Figure 4 This is another structural schematic diagram of the valve sleeve of the directional valve of this utility model;

[0015] Figure 5 This is a half-sectional view of the valve seat of the directional valve of this utility model;

[0016] Figure 6 This is a half-sectional view of the reversing valve seat sleeve of this utility model. Detailed Implementation

[0017] like Figure 1-6As shown, the electro-hydraulic directional valve of this utility model includes a directional valve sleeve 1, a directional valve seat sleeve 2, a directional valve seat 3, a directional valve slide valve 4, a piston rod 5, a spring 6, and a valve seat retainer 7. The valve seat retainer 7 includes a retainer connecting part 12 and retainer locking parts 13 provided at both ends of the retainer connecting part 12. The retainer connecting part 12 has a semi-circular arc structure. The retainer locking part 13 is provided with a retainer mating hole 14. The directional valve sleeve 1 is provided with a valve sleeve mating groove 16, a valve sleeve inner limiting groove 17 for limiting the installation of the directional valve seat 3, and a valve sleeve main cavity 18 for installing the directional valve slide valve 4 in sequence. 1. A valve sleeve locking clearance port 19 is provided at an arc interval in the limiting groove 17 inside the valve sleeve for docking with the locking part 13 of the clamp. The locking part 13 passes through the locking clearance port 19 of the valve sleeve and is fixed to the valve sleeve 1 of the reversing valve by a pin. The outer wall of the valve seat 3 of the reversing valve is provided with a valve seat groove 21 for the valve seat clamp 7 to engage. The valve seat clamp 7 makes the reversing valve seat 3 and the valve sleeve 1 of the reversing valve reliably connected, effectively preventing the valve seat 3 of the reversing valve from shifting. The structure of the valve seat clamp 7 makes it easy to engage with the valve seat 3 of the reversing valve. The two locking parts 13 make it more stable and balanced when connected with the valve sleeve 1 of the reversing valve.

[0018] It also includes a first valve seat sealing ring 8 and a second valve seat sealing ring 9. The outer wall of one end of the directional valve seat 3 is provided with an outer valve seat mounting groove 22. The first valve seat sealing ring 8 is placed between the outer valve seat mounting groove 22 and the inner limiting groove 17 of the valve sleeve. The inner wall of the bottom of the valve sleeve mating groove 16 is provided with an inner valve sleeve positioning groove 23. The second valve seat sealing ring 9 is placed on the inner positioning groove 23 of the valve sleeve, which effectively improves the sealing performance at the mating point.

[0019] The reversing valve seat 2 is provided with a seat connecting boss 25. The width of the reversing valve seat 3 is greater than the depth of the valve sleeve inner limiting groove 17. The end of the seat connecting boss 25 abuts against the side of the reversing valve seat 3, so that the reversing valve seat 2 and the reversing valve seat 3 are reliably connected and have tight contact.

[0020] It also includes a reinforcing screw 10. The inner wall of the valve sleeve mating groove 16 is provided with a valve sleeve internal thread 27 and a valve sleeve threaded hole 28 arranged at intervals around an arc outside the valve sleeve internal positioning groove 23. The outer wall of the seat connecting boss 25 is provided with a seat external thread 29 and a seat anti-slip groove 30 arranged from the outside to the inside, which are threaded to the valve sleeve internal thread 27. After the reinforcing screw 10 is threaded to the valve sleeve threaded hole 28, its bottom end is placed in the seat anti-slip groove 30, which effectively prevents the loosening of the threaded connection between the reversing valve sleeve and the reversing valve seat sleeve, and further improves the tightness and safety of the connection.

[0021] The reversing valve slide valve 4 is provided with the piston rod 5, and the right end of the piston rod 5 is fitted with the spring 6. When the reversing valve slide valve 4 slides to the right and contacts the reversing valve seat 3, it forms a stepped surface seal. When the piston rod 5 slides to the left and contacts the reversing valve seat 3, it forms a conical surface seal. This improves the control accuracy of the electro-hydraulic reversing valve and extends its service life.

[0022] 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. An electro-hydraulic directional valve, characterized in that: The valve includes a reversing valve sleeve (1), a reversing valve seat sleeve (2), a reversing valve seat (3), a reversing valve slide valve (4), a piston rod (5), a spring (6), and a valve seat retainer (7). The valve seat retainer (7) includes a retainer connecting part (12) and retainer locking parts (13) located at both ends of the retainer connecting part (12). The retainer connecting part (12) has a semi-circular arc structure. The retainer locking part (13) is provided with a retainer mating hole (14). The reversing valve sleeve (1) is provided with a valve sleeve mating groove (16) and a retainer for the reversing valve seat (4) in sequence. 3) Install the valve sleeve inner limiting groove (17) for limiting the position and the valve sleeve main cavity (18) for installing the directional valve slide valve (4). The directional valve sleeve (1) is provided with a valve sleeve locking clearance port (19) for docking with the locking part (13) at an arc interval around the valve sleeve inner limiting groove (17). The locking part (13) passes through the valve sleeve locking clearance port (19) and is fixed to the directional valve sleeve (1) by a pin. The outer wall of the directional valve seat (3) is provided with a valve seat groove (21) for the valve seat clip (7) to be engaged.

2. The electro-hydraulic directional valve according to claim 1, characterized in that: It also includes a first sealing ring (8) and a second sealing ring (9) for the valve seat. The outer wall of one end of the valve seat (3) of the reversing valve is provided with an outer mounting groove (22). The first sealing ring (8) for the valve seat is placed between the outer mounting groove (22) and the inner limiting groove (17) of the valve sleeve. The inner wall of the bottom of the valve sleeve mating groove (16) is provided with an inner positioning groove (23) for the valve sleeve. The second sealing ring (9) for the valve seat is placed on the inner positioning groove (23) of the valve sleeve.

3. The electro-hydraulic directional valve according to claim 1, characterized in that: The reversing valve seat (2) is provided with a seat connecting boss (25), the width of the reversing valve seat (3) is greater than the depth of the valve sleeve inner limiting groove (17), and the end of the seat connecting boss (25) abuts against the side of the reversing valve seat (3).

4. The electro-hydraulic directional valve according to claim 2, characterized in that: It also includes a reinforcing screw (10). The inner wall of the valve sleeve mating groove (16) is provided with a valve sleeve internal thread (27) and a valve sleeve threaded hole (28) arranged around an arc outside the valve sleeve internal positioning groove (23). The outer wall of the seat connecting boss (25) is provided with a seat external thread (29) and a seat anti-slip groove (30) that are threadedly connected to the valve sleeve internal thread (27) from the outside to the inside. After the reinforcing screw (10) is threadedly connected to the valve sleeve threaded hole (28), its bottom end is placed in the seat anti-slip groove (30).

5. The electro-hydraulic directional valve according to claim 1, characterized in that: The reversing valve slide valve (4) is provided with the piston rod (5), and the right end of the piston rod (5) is fitted with the spring (6). When the reversing valve slide valve (4) slides to the right and contacts the reversing valve seat (3), it forms a stepped surface seal. When the piston rod (5) slides to the left and contacts the reversing valve seat (3), it forms a conical surface seal.

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