Sealing structure of electro-hydraulic reversing valve

Abstract

The utility model relates to the technical field of electro-hydraulic directional control valves, in particular to an electro-hydraulic directional control valve sealing structure which comprises an electro-hydraulic directional control valve body, a hydraulic control directional control valve and an oil cylinder, coils are arranged at the two ends of the inner side of the electro-hydraulic directional control valve body, and the hydraulic control directional control valve is arranged on the surface of the bottom end of the electro-hydraulic directional control valve body. Iron nuts are arranged on the surfaces of the two ends of the hydraulic control reversing valve, an L cavity and an R cavity are formed in the two ends of the inner side of the hydraulic control reversing valve respectively, a reset spring and a sealing ring are arranged on the inner side of the L cavity and the inner side of the R cavity respectively, a connector assembly is arranged on the surface of the bottom end of the hydraulic control reversing valve, and an oil cylinder is arranged at the bottom end of the hydraulic control reversing valve. An iron nut locking mode is used for replacing an original mode that a cover plate is locked through four screws, the overall use efficiency is effectively improved, and the problems that deformation gaps are generated due to the fact that existing locking force is smaller than internal pressure, and internal hydraulic oil leaks to the outside due to long-time work can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electro -hydraulic reversing valve technical field especially relates to a kind of electro -hydraulic reversing valve sealing structure. BACKGROUND

[0002] According to the search, the existing patent document with the announcement number CN218439994U discloses a high-reliability electro-hydraulic reversing valve with strong sealing, which comprises a main valve body, a main valve core movably connected inside the main valve body, a return spring fixedly connected to the outer wall of the main valve core, a pilot electromagnetic valve fixedly connected to the top end of the main valve body, an electromagnet movably connected inside the pilot electromagnetic valve, a spring cavity formed in the main valve body, a manual button fixedly connected to one side of the pilot electromagnetic valve, and a first sealing gasket fixedly connected to the outer wall of the main valve body. The device uses a high-reliability electro-hydraulic reversing valve with strong sealing, which can provide good sealing effect for the electro-hydraulic reversing valve, improve the sealing performance of the electro-hydraulic reversing valve, and enhance the use effect of the electro-hydraulic reversing valve, thereby improving the stability of the electro-hydraulic reversing valve during operation and effectively prolonging the service life of the electro-hydraulic reversing valve, thus improving the practicality of the electro-hydraulic reversing valve.

[0003] The electro-hydraulic reversing valve is a hydraulic reversing valve combined with an electromagnetically operated pilot valve. It is pushed by pressure oil in the control oil circuit. The electro-hydraulic reversing valve and the hydraulic control reversing valve are mainly used in hydraulic systems with flow exceeding the normal working allowable range of the electromagnetic reversing valve to control the movement of the actuator or control the flow direction of the oil. The traditional electro-hydraulic reversing valve has a valve cover made of gray iron due to the material of the hydraulic control directional valve. Four screws are used for fixation. The locking force of the screws is the largest near the screws and decreases towards the middle of the two screws. When the oil pressure in the valve cover cavity is too high, the locking force at the screw position of the hydraulic control reversing valve cover is smaller than the oil pressure, resulting in deformation gap, and internal hydraulic oil leaks to the outside after long-term operation. SUMMARY

[0004] The utility model solves the technical problems of the prior art, provides an electro-hydraulic reversing valve sealing structure, and aims to solve the technical problems of the traditional electro-hydraulic reversing valve, which has a valve cover made of gray iron due to the material of the hydraulic control directional valve. Four screws are used for fixation. The locking force of the screws is the largest near the screws and decreases towards the middle of the two screws. When the oil pressure in the valve cover cavity is too high, the locking force at the screw position of the hydraulic control reversing valve cover is smaller than the oil pressure, resulting in deformation gap, and internal hydraulic oil leaks to the outside after long-term operation.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] The utility model relates a kind of electro-hydraulic reversing valve sealing structure, including electro-hydraulic reversing valve body, hydraulic control reversing valve and oil cylinder, the coil is uniformly arranged in the inside both ends of electro-hydraulic reversing valve body, electro-hydraulic reversing valve body bottom end surface is provided with hydraulic control reversing valve, the iron nut is uniformly arranged in the both ends surface of hydraulic control reversing valve, the inside both ends of hydraulic control reversing valve is separately provided with L cavity and R cavity, the inside of L cavity and R cavity is separately provided with reset spring and sealing ring, the interface assembly is provided on the bottom end surface of hydraulic control reversing valve, and the oil cylinder is provided on the bottom end of hydraulic control reversing valve.

[0007] As further description of the above technical solution:

[0008] The electro-hydraulic reversing valve body and the hydraulic control reversing valve are spliced and assembled, the hydraulic control reversing valve passages are 10, 16, 22, 25 and 32 respectively, and the hydraulic control reversing valve and the iron nut are threadedly connected, the inside of the iron nut is grooved, and L cavity and R cavity are provided.

[0009] As further description of the above technical solution:

[0010] The L cavity and the R cavity are fixedly connected with the reset spring, the interface assembly on the bottom end of the hydraulic control reversing valve is sequentially provided with an oil discharge port, a working port, an oil inlet, a working port and an oil discharge port from left to right, and the hydraulic control reversing valve and the oil cylinder are fixedly connected to the working port through a pipe fitting.

[0011] The utility model has the following beneficial effects:

[0012] In the utility model, the iron nut locking mode is used to replace the original four-screw locking cover plate mode, effectively improving the overall use efficiency, and solving the problem of deformation gap caused by the fact that the existing locking force is less than the internal pressure, and internal hydraulic oil leakage to the outside caused by long-time work. DRAWINGS

[0013] The drawings are used to provide further understanding of the utility model and constitute a part of the specification, which is used together with the embodiments of the utility model to explain the utility model, and does not constitute a limitation on the utility model. In the drawings:

[0014] Figure 1 It is the overall structure of the utility model and is shown in the schematic diagram;

[0015] Figure 2 It is the electro-hydraulic reversing valve body structure of the utility model and is shown in the schematic diagram;

[0016] In the drawing: 1, electro-hydraulic reversing valve body; 2, hydraulic control reversing valve; 3, oil cylinder; 4, coil; 5, iron nut; 6, L cavity; 7, R cavity; 8, reset spring; 9, sealing ring; 10, interface assembly. DETAILED DESCRIPTION

[0017] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model.

[0018] The same reference numerals in the drawings refer to the same components.

[0019] Example 1

[0020] Referring to Figures 1-2 The utility model provides an embodiment: a kind of electro-hydraulic reversing valve sealing structure, including electro-hydraulic reversing valve body 1, hydraulic control reversing valve 2 and oil cylinder 3, coil 4 is set in electro-hydraulic reversing valve body 1 inner side both ends, electro-hydraulic reversing valve body 1 bottom end surface is provided with hydraulic control reversing valve 2, the both ends surface of hydraulic control reversing valve 2 is provided with iron nut 5, L cavity 6 and R cavity 7 are respectively set in the inner side of both ends of hydraulic control reversing valve 2, reset spring 8 and sealing ring 9 are respectively set in the inner side of L cavity 6 and R cavity 7, interface assembly 10 is provided on the bottom end surface of hydraulic control reversing valve 2, and oil cylinder 3 is provided on the bottom end of hydraulic control reversing valve 2.

[0021] Electro-hydraulic reversing valve body 1 and hydraulic control reversing valve 2 are spliced and assembled, and the hydraulic control reversing valve 2 is provided with passages 10, 16, 22, 25 and 32, respectively.Hydraulic control reversing valve 2 and iron nut 5 are threadedly connected, and the inner side of iron nut 5 is provided with a groove, which is provided with L cavity 6 and R cavity 7, respectively.

[0022] L cavity 6 and R cavity 7 are fixedly connected with reset spring 8, and the interface assembly 10 on the bottom end of hydraulic control reversing valve 2 is sequentially provided with an oil discharge port, a working port, an oil inlet, a working port and an oil discharge port from left to right, and the hydraulic control reversing valve 2 and the oil cylinder 3 are fixedly connected through the working port by a pipe fitting.

[0023] Specifically, electro-hydraulic reversing valve body 1, hydraulic control reversing valve 2, oil cylinder 3, coil 4, iron nut 5, L cavity 6, R cavity 7, reset spring 8, sealing ring 9 and interface assembly 10 form an electro-hydraulic reversing valve sealing structure. Due to the use of iron nut 5 locking method, if the oil inlet pressure of R cavity 7 or L cavity 6 is too high, most of the pressure is offset by the threaded connection of iron nut 5, a small part of the hydraulic oil seeps out from the threaded connection of iron nut 5 and is blocked by sealing ring 9, which can effectively solve the problem that the existing locking force is less than the internal pressure, resulting in deformation gap, and long-term work will cause internal hydraulic oil to leak to the outside. Figure 1As shown, the liquid reversing valve is combined with the electromagnetic reversing valve and the hydraulic control reversing valve 2 to be called the electro-hydraulic reversing valve body 1, and the hydraulic valve controls the direction or switch of the hydraulic oil in the hydraulic oil path. Since the hydraulic control reversing valve 2 is divided into 10, 16, 22, 25, 32 and several through types, the different through principles are the same, the hydraulic oil is pumped by the oil pump to enter the valve from the oil inlet at the bottom of the hydraulic control reversing valve 2, and is communicated with the P1 hole inside the electro-hydraulic reversing valve body 1, the coil 4 inside the electro-hydraulic reversing valve body 1 is connected to the voltage to generate an electromagnetic thrust, the valve core F1 is pushed to the right to communicate P1 and B1, A1 and T1, the hydraulic oil is sent from P1 to the R cavity 7 of the hydraulic control reversing valve 2 through B1, the R cavity 7 of the hydraulic control reversing valve 2 is pushed by the injected hydraulic oil to move the hydraulic control reversing valve 2 F to the left, so that the interface assembly 10 of the hydraulic control reversing valve 2 is communicated between the oil inlet and the working port at one end, and the working port and the oil discharge port at the other end, thereby controlling the forward or backward movement of the oil cylinder, and the coil 4 is de-energized. The valve core F of the electro-hydraulic reversing valve is pushed back to the middle position by the return spring 8, and the oil cylinder 3 stops moving.

[0024] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. An electro-hydraulic directional valve seal structure comprising an electro-hydraulic directional valve body (1), a hydraulic directional valve (2) and a cylinder (3), characterized in that, The electric hydraulic reversing valve body (1) is provided with a coil (4) at both ends, the bottom surface of the electric hydraulic reversing valve body (1) is provided with a hydraulic control reversing valve (2), the two end surfaces of the hydraulic control reversing valve (2) are provided with iron nuts (5), the two ends of the hydraulic control reversing valve (2) are provided with an L cavity (6) and an R cavity (7) respectively, the inside of the L cavity (6) and the R cavity (7) are provided with a reset spring (8) and a sealing ring (9) respectively, the bottom surface of the hydraulic control reversing valve (2) is provided with an interface assembly (10), and the bottom of the hydraulic control reversing valve (2) is provided with an oil cylinder (3).

2. An electro-hydraulic reversing valve seal structure according to claim 1, wherein The electric hydraulic reversing valve body (1) and the hydraulic control reversing valve (2) are spliced and assembled, the hydraulic control reversing valve (2) is provided with passages of 10, 16, 22, 25 and 32 respectively, the hydraulic control reversing valve (2) and the iron nut (5) are threadedly connected, the inside of the iron nut (5) is provided with a groove, and the L cavity (6) and the R cavity (7) are provided respectively.

3. An electro-hydraulic reversing valve seal structure according to claim 1, wherein The L cavity (6) and the R cavity (7) are fixedly connected with the reset spring (8), the interface assembly (10) at the bottom of the hydraulic control reversing valve (2) is sequentially provided with an oil discharge port, a working port, an oil inlet, a working port and an oil discharge port from left to right, and the hydraulic control reversing valve (2) and the oil cylinder (3) are fixedly connected through a pipe fitting.

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