Limiting structure of hydraulic valve

Abstract

The utility model is applicable to the technical field of control valves, and provides a hydraulic valve limiting structure which comprises a valve body, a valve core, an end cover and a sealing ring, the valve core horizontally moves in the valve body, a cavity in the valve body is formed by the end cover and the sealing ring, a limiting piece is annularly arranged on the valve core, and the valve core is connected with a linear driving mechanism. In this way, the limiting piece and the end cover are arranged at one end of the valve element, the movement of the valve element can be precisely limited, the valve element is driven by the driving mechanism to horizontally reciprocate in the valve body at the other end of the valve element, and the limiting effect of the other end of the valve element is achieved; the sealing performance of the valve body is ensured through the sealing ring arranged between the valve element and the valve body, the structure is compact, and the application range is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a hydraulic valve limit structure. Background Art

[0002] Multi-way valve groups mostly adopt unified modular design, which can provide reliable system solutions for manufacturers of engineering vehicles. Users can combine the valve bodies according to functional requirements, which is simple and reliable. Therefore, multi-way valves are applied in fields such as excavators, small loaders, backhoe loaders, drills, forklifts, mining machines, and agricultural machines.

[0003] Chinese Patent with application number 201420104660.X discloses an oil inlet valve block and a compound control flow multi-way valve, including an oil inlet valve body, a first load-sensitive cavity, a negative flow feedback cavity, and a throttle valve. A control structure for controlling whether the oil inlet cavity communicates with the negative flow feedback cavity according to the oil pressure in the oil inlet cavity and the oil pressure in the first load-sensitive cavity is provided in the oil inlet valve body. However, in actual use, there is a lack of fast and stable control of the valve core and a matching limit structure.

[0004] As is known from the above, there are obviously inconveniences and defects in the prior art in actual use, so it is necessary to improve. A hydraulic valve limit structure is proposed for the above problems. Summary of the Utility Model

[0005] Aiming at the above defects, the purpose of the utility model is to provide a hydraulic valve limit structure, which limits the movement of the valve core by a limit member provided on the valve core, and provides a hydraulic valve limit structure.

[0006] To achieve the above purpose, the utility model provides a hydraulic valve limit structure, including a valve body, a valve core that moves horizontally is inserted through the valve body, and an end cover coaxial with the valve core is provided on the valve body.

[0007] A cavity is formed between the end cover, the valve core and the valve body.

[0008] A limit member for moving the valve core in the cavity is provided around the valve core.

[0009] At least one sealing ring is provided between the valve core and the valve body.

[0010] According to a hydraulic valve limit structure of the utility model, a gasket is provided between the end cover and the valve body.

[0011] According to a hydraulic valve limit structure of the utility model, a retaining ring is provided between the valve body and the sealing ring, and the retaining ring is arranged between the gasket and the sealing ring.

[0012] A hydraulic valve limiting structure according to the present utility model, wherein the limiting member is a snap ring, and a groove cooperating with the limiting member is provided on the valve core.

[0013] A hydraulic valve limiting structure according to the present utility model, wherein the limiting member is a detachable sleeve, and an annular groove cooperating with the limiting member is provided on the valve core.

[0014] A hydraulic valve limiting structure according to the present utility model, wherein one end of the valve core is connected to a linear driving mechanism.

[0015] A hydraulic valve limiting structure according to the present utility model, wherein the gasket, snap ring, sealing ring and end cover are coaxial with the valve core.

[0016] A hydraulic valve limiting structure according to the present utility model, wherein the end cover is a cylindrical structure with one end closed, and the end cover is connected to the valve body by bolts.

[0017] The present utility model provides a hydraulic valve limiting structure, and its beneficial effects are as follows:

[0018] 1. By arranging a limiting member and an end cover at one end of the valve core, the movement of the valve core can be limited. At the other end of the valve core, the valve core is driven by a driving mechanism to perform horizontal reciprocating movement in the valve body, realizing the limiting function at the other end of the valve core;

[0019] 2. By using the sealing ring arranged between the valve core and the valve body, the sealing performance of the valve body is ensured, the structure is compact, and the applicable range is wide. Description of the Drawings

[0020] Figure 1 It is a schematic exploded view structure diagram of the present utility model;

[0021] Figure 2 It is a schematic overall structure diagram of the present utility model;

[0022] Figure 3 It is a schematic structure diagram at the valve core;

[0023] Figure 4 It is Figure 3 a schematic structure diagram of part A in

[0024] In the figure: 1-valve body, 10-valve core, 21-oil chamber P, 22-oil chamber A, 23-oil chamber B, 24-check valve, 25-B-way switch, 210-oil return port T, 220-oil chamber inlet A, 230-oil chamber inlet B, 240-oil inlet P, 3-end cover, 4-limiting member, 41-gasket, 42-snap ring, 43-sealing ring, 5-linear driving mechanism. Detailed Embodiments

[0025] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0027] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] See also Figures 1 to 4 The utility model provides a hydraulic valve limiting structure, including a valve body 1, in which a horizontally movable valve core 10 is penetrated, and an end cover 3 coaxial with the valve core 10 is provided on the valve body 1, and the end cover 3 limits the valve core 10. At the same time, a cavity is formed between the end cover 3 and the valve body 1, and a limiting member 4 is provided on the valve core 10 to enable the valve core 10 to move in the cavity.

[0029] Furthermore, the limiting member 4 is a retaining spring, and the valve core 10 is limited by the limiting member 4 so that the valve core 10 will not be separated from the cavity. The valve core 10 is provided with a groove that cooperates with the limiting member 4.

[0030] Furthermore, the limit member 4 is a detachable sleeve, and the valve core 10 is provided with an annular groove that cooperates with the limit member 4. The sleeve has elastic deformation and a cross-sectional area larger than the valve core 10. The sleeve passes through the valve core 10 and is installed on the annular groove of the valve core 10 through the deformation ability of the sleeve.

[0031] Specifically, the end cover 3 is a cylindrical structure with one end closed, and the end cover 3 is connected to the valve body 1 by bolts.

[0032] The end cover 3 is fixed to the valve body 1 by bolts. A gasket 41 is provided between the end cover 3 and the valve body 1. The gasket 41 connects the end cover 3 and the valve body 1. A retaining ring 42 is provided between the valve body 1 and the sealing ring 43. The retaining ring 42 is arranged between the gasket 41 and the sealing ring 43. The sealing ring 43 abuts against the oil chamber end face of the valve body 1. The sealing ring 43 has a certain elasticity and provides a supporting force when the linear drive mechanism 5 drives the valve core 10 to move to the left (see Figure 3 ). When moving, the gasket 41, the retaining ring 42 and the sealing ring 43 are all arranged around the valve core 10 and the gasket 41, the retaining ring 42 and the sealing ring 43 are coaxially arranged with the valve core 10.

[0033] Furthermore, the gasket 41, the retaining ring 42 and the sealing ring 43 are all made of rubber in a circular ring shape, which is convenient for replacement and has a certain elastic deformation to achieve the sealing effect between the end cover 3 and the valve body 1.

[0034] An oil chamber A22 and an oil chamber B23 that cooperate with the valve core 10 are opened in the valve body 1. An oil chamber P21 is provided between the two cavities of the oil chamber A22 and the oil chamber B23. An oil chamber inlet A220 and an oil chamber inlet B230 are provided between the oil chamber A22 and the oil chamber B23 and the valve body 1. The oil chamber inlet A220 and the oil chamber inlet B230 are respectively connected to both ends of the hydraulic mechanism of agricultural implements such as plows on the tractor. The oil chamber P21 is connected to the oil inlet of the fuel tank. A one-way valve 24 is provided between the oil chamber P21 and the oil chamber A22 and the oil chamber B23. After the oil chamber P21 is communicated with the oil chamber A22 or the oil chamber B23 through the one-way valve 24 and the movement of the valve core 10, the oil in the valve body 1 is transported to the oil chamber A22 and the oil chamber B23 through the oil chamber P21.

[0035] A linear drive mechanism 5 is connected to the valve core 10. The linear drive mechanism 5 cooperates with the valve body 1 to drive the valve core 10 to perform a horizontal displacement in the valve body 1. A threaded shaft is provided in the linear drive mechanism 5. One end of the threaded shaft is driven to rotate by a driving member such as a motor. The other end of the threaded shaft penetrates into the valve body 1 and is threadedly connected to a threaded sleeve. The threaded sleeve cooperates with the valve core 10 to drive the valve core 10 to perform a horizontal movement.

[0036] Furthermore, the linear drive mechanism 5 can be replaced by a component that drives the valve core 10 to perform a horizontal reciprocating movement (for example, springs are arranged on both sides of the valve core 10), which belongs to the conventional technical means of those skilled in the art and will not be elaborated here.

[0037] When the spool 10 is in the neutral position (the neutral sealing shoulder on the spool 10 is directly below the oil chamber P21), the oil in the valve body 1 is in a static locked state. The linear drive mechanism 5 drives the spool 10 to move to the right (see Figure 3), and the oil in the valve body 1 flows from the oil chamber P21 to the oil chamber A22, cushioning the oil pressure flowing into the oil chamber A22.

[0038] See Figure 1 and Figure 2 Preferably, the hydraulic valve is a multi-way union. A spool 10 is inserted into the multi-way union valve body 1. The spool 10 is connected to the linear drive mechanism 5. The linear drive mechanism 5 is used to drive the multi-way union spool 10 to move horizontally within the multi-way union valve body 1, and to form three circuits of rising, neutral, and falling between the multi-way union spool 10 and the multi-way union valve body 1. On the other side of the multi-way union spool 10, there is a multi-way valve end cover 3. The multi-way valve front end cover 3 is used to limit the position of the multi-way union valve rod relative to the multi-way union valve body 1. The multi-way valve end cover 3 is provided with threaded holes and is fixed to the multi-way union valve body 1 by bolts. A sealing ring 43 that cooperates with the multi-way union valve body 1 is provided inside the multi-way valve end cover 3. The sealing ring 43 is used to achieve the seal between the multi-way union valve body 1 and the multi-way valve end cover 3.

[0039] The specific implementation process of the present utility model is as follows:

[0040] An oil return pipe and an oil inlet pipe are respectively connected to the oil return port T210 and the oil inlet port P240. The linear drive mechanism 5 is started to drive the multi-way union spool 10 to move within the multi-way union valve body 1.

[0041] When the hydraulic mechanism performs a lifting operation, the linear drive mechanism 5 drives the spool 10 in the direction close to the linear drive mechanism 5 (see Figure 3 for the spool 10 to move to the right), at this time, the limiting effect on the right side of the spool 10 is provided by the linear drive mechanism 5, making the oil chamber P21 communicate with the oil chamber A22 (the communication channel between the oil chamber P21 and the oil chamber A22 is not shown in the figure). The oil flows from the oil chamber P21 into the oil chamber A22. The oil in the oil chamber P21 pushes the check valve 24 and makes the check valve 24 conduct, enabling the hydraulic oil in the oil chamber P21 to pass through the oil chamber A22. At this time, the oil chamber B23 communicates with the fuel tank, and the oil in the oil chamber B23 returns to the fuel tank under the action of the oil pressure, completing the lifting function of the implements on the tractor.

[0042] When the hydraulic mechanism performs a lowering operation, the oil chamber P21 communicates with the oil chamber B23. The linear drive mechanism 5 drives the spool 10 in the direction away from the linear drive mechanism 5 (see Figure 3When the spool 10 moves in the left direction, the limiting effect on the left side of the spool 10 is achieved by the limiting member 4 on the spool 10 and the end cover 3. The limiting member 4 prevents the spool 10 from exceeding the position of the cavity during movement. When the spool 10 moves too far, the spool 10 is limited by abutting against the inside of the end cover 3. Subsequently, the conduction between the oil chamber A22 and the oil chamber B23 operates in the opposite manner to the above-mentioned lifting operation, thereby completing the lowering function of the hydraulic mechanism.

[0043] When the hydraulic mechanism is in a static state, the channels between the oil chamber P21 and the oil chamber A22 and between the oil chamber P21 and the oil chamber B23 are not connected. The spool 10 moves to the neutral position (i.e., the middle sealing shoulder is directly below the oil chamber P21). When the spool 10 returns to the neutral position, the hydraulic mechanism is in a static locked state at this time.

[0044] Of course, the present utility model can also have many other embodiments. Without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model. However, these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. A hydraulic valve limit structure, characterized in that, It includes a valve body, a movable valve core is inserted through the valve body, a detachable end cover cooperating with the valve core is provided on the valve body, and a cavity cooperating with the valve core is provided between the end cover and the valve body; At least one detachable limiting member capable of limiting the moving distance of the valve core is sleeved on the valve core in the cavity; At least one sealing ring is provided between the valve core and the valve body.

2. The hydraulic valve limit structure according to claim 1, characterized in that, A gasket is provided between the end cover and the valve body.

3. The hydraulic valve limit structure according to claim 2, characterized in that, A retaining ring is provided between the valve body and the sealing ring, and the retaining ring is arranged between the gasket and the sealing ring.

4. A hydraulic valve limit structure according to claim 1, characterized in that The limiting member is a circlip, and a groove cooperating with the limiting member is provided on the valve core.

5. A hydraulic valve limit structure according to claim 1, characterized in that The limiting member is a detachable sleeve, and a ring groove cooperating with the limiting member is provided on the valve core.

6. The hydraulic valve limit structure according to claim 3, characterized in that, One end of the valve core is connected to a linear driving mechanism.

7. The hydraulic valve limit structure according to claim 3, characterized in that, The gasket, the retaining ring, the sealing ring and the end cover are coaxial with the valve core.

8. A hydraulic valve limit structure according to claim 1, characterized in that, The end cover is a cylindrical structure with one end closed, and the end cover is connected to the valve body by bolts.

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