Reverse rotation prevention valve
By adjusting the design of components and elastic elements, the applicability of the anti-reverse valve has been improved, solving the problem of high cost of traditional anti-reverse valves, reducing design and spare parts costs, and ensuring the stability of the rotary motor.
Patent Information
- Application Number
- CN202423283246.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Traditional anti-reverse valves require different spring and valve core stroke designs for excavators of different tonnages, resulting in high design and spare parts costs, large inventory pressure, and inability to adapt to the pressure drop range of different rotary motors.
Design an anti-reverse valve by adjusting the stroke of the first valve core and the compression of the first elastic element through an adjustment component, combined with the working mode of two hydraulic valves, to achieve applicability to rotary motors and reduce design and spare parts costs.
It improves the applicability of the anti-reverse valve, reduces design and spare parts costs, alleviates inventory pressure, and ensures stable operation of the rotary motor.
Smart Images
Figure CN223498317U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic valve technology, and in particular to an anti-reverse valve. Background Technology
[0002] The anti-reverse valve is an important component of the excavator's swing motor. Its main function is to prevent the swing motor from reversing due to inertial impact when it stops rotating, thus ensuring that the swing motor can work smoothly.
[0003] However, excavators of different tonnages have different swing loads. Traditional anti-reverse valves require different spring and valve core stroke designs to cope with different pressure drop ranges. When the swing motor brakes, the range and magnitude of the pressure drop vary, and traditional anti-reverse valves can only adapt to one pressure drop range and pressure magnitude. This leads to the need for anti-reverse valves to be customized according to the excavator's requirements, greatly increasing design and spare parts costs and inventory pressure. Utility Model Content
[0004] The purpose of this invention is to provide an anti-reverse valve that can adjust the stroke of the first valve core and the compression of the first elastic element according to different parameters of the rotary motor, thereby improving the applicability of the anti-reverse valve, reducing design and spare parts costs, and alleviating inventory pressure.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] An anti-reverse valve includes a valve body and two hydraulic valves. The valve body has a fixing groove corresponding to each of the two hydraulic valves, and a limiting surface is provided within the fixing groove. The two hydraulic valves are connected to a rotary motor in opposite directions. Each hydraulic valve includes:
[0007] A valve sleeve is disposed in the fixed groove. The valve sleeve includes a main valve chamber and an oil inlet and an oil outlet communicating with the main valve chamber.
[0008] A valve core assembly is disposed within the valve sleeve. The valve core assembly has a connecting hole that connects the main valve chamber and the oil inlet. The valve core assembly includes a first valve core and a second valve core that are sealed and separable. The oil outlet is connected to the connection position of the first valve core and the second valve core. Hydraulic oil entering through the oil inlet can drive the first valve core and the second valve core to move so that the second valve core abuts against the limiting surface.
[0009] A first elastic element is disposed between the first valve core and the valve sleeve to drive the first valve core away from the limiting surface;
[0010] An adjustment component is disposed on the valve sleeve and configured to adjust the stroke of the valve core assembly.
[0011] As an alternative to the aforementioned anti-reverse valve, the adjusting assembly includes an adjusting rod that is threadedly connected to the valve sleeve, and the adjusting rod is capable of abutting the end of the first valve core away from the second valve core.
[0012] As an alternative to the aforementioned anti-reverse valve, the adjusting assembly further includes a locking nut, which is sleeved on the adjusting rod and threadedly connected to the adjusting rod. The locking nut is configured to abut against the valve sleeve to lock the relative position between the valve sleeve and the adjusting rod.
[0013] As an optional embodiment of the aforementioned anti-reverse valve, the anti-reverse valve further includes a second elastic element, which is disposed between the second valve core and the valve body to drive the second valve core away from the limiting surface, and the speed at which the second valve core moves away from the limiting surface is less than the speed at which the first valve core moves away from the limiting surface.
[0014] As an optional solution for the aforementioned anti-reverse valve, a second step is provided inside the valve sleeve. The second valve core includes a large-diameter section and a small-diameter section. The small-diameter section passes through the second step, and a damping cavity is formed between the large-diameter section and the second step. The damping cavity is connected to the oil inlet through a damping hole.
[0015] As an optional solution for the aforementioned anti-reverse valve, a first step is provided inside the valve sleeve, which divides the main valve chamber into a first valve chamber and a second valve chamber. The connection position between the first valve core and the second valve core is located in the second valve chamber. The oil outlet communicates with the second valve chamber, and one end of the communicating hole is located inside the first valve chamber.
[0016] As an alternative to the aforementioned anti-reverse valve, the end face of the first valve core near the second valve core has an inclined sealing surface, and the second valve core abuts against the sealing surface to form a seal between the first valve core and the second valve core.
[0017] As an alternative to the aforementioned anti-reverse valve, a receiving cavity is provided between the first valve core and the second valve core, and a sealing member is provided in the receiving cavity. The second valve core and the first valve core are in sealing contact, and the sealing member can block the second connecting hole of the second valve core.
[0018] As an alternative to the aforementioned anti-reverse valve, the first valve core includes a valve core body and a push rod. The valve core body has a groove at one end near the adjusting component. The push rod is slidably disposed in the groove and has a clearance fit with the inner wall of the groove. The push rod abuts against the adjusting component.
[0019] As an optional solution for the aforementioned anti-reverse valve, the outer periphery of the push rod is provided with multiple oil reservoirs spaced axially.
[0020] The beneficial effects of this utility model are:
[0021] This invention provides an anti-reverse valve. In this anti-reverse valve, two hydraulic valves are used to control the forward and reverse rotation of a rotary motor, respectively. When the rotary motor is operating normally, the first and second valve cores of the active hydraulic valve assembly abut and seal, and under oil pressure, compress the first elastic element and abut against the limiting surface. When the rotary motor brakes, the oil pressure at the inlet of the hydraulic valve suddenly decreases. At this time, the first elastic element can drive the first valve core away from the limiting surface, thereby disengaging the first and second valve cores. The hydraulic oil in the main valve chamber can then flow out through the outlet, which is connected to the low-pressure port of the rotary motor. This is equivalent to spraying a certain volume of hydraulic oil from the high-pressure port of the rotary motor to the low-pressure port, thus balancing the pressure difference between the high-pressure and low-pressure ports and preventing the rotary motor from reversing.
[0022] The adjustment component allows operators to adjust the stroke of the first valve core and the compression of the first elastic element according to different parameters of the rotary motor, which improves the applicability of the anti-reverse valve, reduces design and spare parts costs, and alleviates inventory pressure. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the anti-reverse valve provided by this utility model;
[0024] Figure 2 This is a cross-sectional view of the anti-reverse valve provided by this utility model;
[0025] Figure 3 This is a schematic diagram of the structure of the hydraulic valve provided by this utility model.
[0026] In the picture:
[0027] 1. Valve body; 11. Limiting surface;
[0028] 2. Hydraulic valve; 2a. First hydraulic valve; 2b. Second hydraulic valve;
[0029] 21. Valve sleeve; 211. Oil inlet; 212. Oil outlet; 213. Main valve chamber; 2131. First valve chamber; 2132. Second valve chamber; 214. Damping chamber; 215. Damping orifice; 216. First step; 217. Second step;
[0030] 22. Valve core assembly; 221. First valve core; 2211. First connecting hole; 2212. Sealing surface; 2213. Receiving cavity; 2214. Valve core body; 2215. Push rod; 22151. Oil reservoir; 2216. Slide groove; 222. Second valve core; 2221. Second connecting hole; 2222. Small diameter section; 2223. Large diameter section; 223. Sealing component;
[0031] 23. First elastic element; 24. Second elastic element;
[0032] 25. Adjustment assembly; 251. Adjustment rod; 252. Locking nut; 253. Screw sleeve. Detailed Implementation
[0033] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.
[0035] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0036] Unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0037] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0038] This embodiment provides a valve to prevent reverse rotation, such as Figure 1 and Figure 2 As shown, the anti-reverse valve includes a valve body 1 and two hydraulic valves 2. The anti-reverse valve is installed on the rotary motor. The two hydraulic valves 2 are connected to the rotary motor in opposite ways to control the swaying problem when the rotary motor is braked and improve the stability of the rotary motor.
[0039] like Figures 1-3 As shown, the two hydraulic valves 2 are connected to the rotary motor in opposite ways, meaning that the rotary motor includes port A and port B. The inlet 211 of one hydraulic valve 2 and the outlet 212 of the other hydraulic valve 2 are both connected to port A, and the outlet 212 of one hydraulic valve 2 and the inlet 211 of the other hydraulic valve 2 are both connected to port B. In this embodiment, the example is taken where the oil pressure at port A is higher than that at port B when the rotary motor is operating.
[0040] like Figure 2 and Figure 3 As shown, valve body 1 is provided with a fixing groove for each of the two hydraulic valves 2. A limiting surface 11 is provided within the fixing groove. Each hydraulic valve 2 includes a valve sleeve 21, a valve core assembly 22, and a first elastic element 23. The valve sleeve 21 is disposed in the fixing groove and includes a main valve chamber 213 and an oil inlet 211 and an oil outlet 212 communicating with the main valve chamber 213. The valve core assembly 22 is disposed within the valve sleeve 21 and has a connecting hole communicating with the main valve chamber 213 and the oil inlet 211. The core assembly 22 includes a first valve core 221 and a second valve core 222 that are sealed and separable. The oil outlet 212 is connected to the connection position of the first valve core 221 and the second valve core 222. The hydraulic oil entering through the oil inlet 211 can drive the first valve core 221 and the second valve core 222 to move so that the second valve core 222 abuts against the limiting surface 11. The first elastic member 23 is disposed between the first valve core 221 and the valve sleeve 21 to drive the first valve core 221 away from the limiting surface 11.
[0041] In this anti-reverse valve, two hydraulic valves 2 are used to control the forward and reverse rotation of the rotary motor, respectively. When the rotary motor is working normally, the first valve core 221 and the second valve core 222 of the valve core assembly 22 of the active hydraulic valve 2 abut and seal, and under the action of oil pressure, the first elastic element 23 is compressed and abuts against the limiting surface 11. When the rotary motor brakes, the oil pressure at the oil inlet 211 of the hydraulic valve 2 suddenly drops. At this time, the first elastic element 23 can drive the first valve core 221 away from the limiting surface 11, thereby disengaging the first valve core 221 from the second valve core 222. The hydraulic oil in the main valve chamber 213 can flow out through the oil outlet 212. The oil outlet 212 is connected to the low-pressure port of the rotary motor, which is equivalent to spraying a certain volume of hydraulic oil from the high-pressure port of the rotary motor to the low-pressure port, thereby balancing the pressure difference between the high-pressure port and the low-pressure port and preventing the rotary motor from reversing.
[0042] like Figures 1-3 As shown, the hydraulic valve 2 also includes an adjusting assembly 25, which is disposed on the valve sleeve 21 and configured to adjust the stroke of the valve core assembly 22. The adjusting assembly 25 allows the operator to adjust the stroke of the first valve core 221 and the compression of the first elastic element 23 according to different parameters of the rotary motor, thereby changing the compensation speed of the pressure difference between the high-pressure port and the low-pressure port when the rotary motor is braked. This improves the applicability of the anti-reverse valve, reduces design and spare parts costs, and alleviates inventory pressure.
[0043] In this embodiment, the first valve core 221 has a first connecting hole 2211 and the second valve core 222 has a second connecting hole 2221. When the first valve core 221 and the second valve core 222 abut and seal, the first connecting hole 2211 and the second connecting hole 2221 connect to the stroke connecting hole, so that the hydraulic oil at the oil inlet 211 can enter the main valve chamber 213 through the connecting hole.
[0044] In this embodiment, the first valve core 221 includes a valve core body 2214 and a push rod 2215. A groove 2216 is provided at one end of the valve core body 2214 near the adjusting assembly 25. The push rod 2215 is slidably disposed within the groove 2216 and has a clearance fit with the inner wall of the groove 2216. The push rod 2215 abuts against the adjusting assembly 25. During the movement of the valve core body 2214, the push rod 2215 remains in contact with the adjusting assembly 25, improving the stability of the valve core body 2214.
[0045] Furthermore, multiple oil reservoirs 22151 are axially spaced along the outer periphery of the push rod 2215. Since the slide groove 2216 and the push rod 2215 are in clearance fit, hydraulic oil can slowly flow through the gap between the slide groove 2216 and the push rod 2215 into the main valve chamber 213. At this time, the hydraulic oil can also fill the oil reservoirs 22151, so that there is always hydraulic oil between the slide groove 2216 and the push rod 2215, ensuring lubrication between the push rod 2215 and the valve core body 2214.
[0046] like Figure 3 As shown, the anti-reverse valve also includes a second elastic element 24, which is disposed between the second valve core 222 and the valve body 1 to drive the second valve core 222 away from the limiting surface 11. The speed at which the second valve core 222 moves away from the limiting surface 11 is less than the speed at which the first valve core 221 moves away from the limiting surface 11. The second elastic element 24 can drive the second valve core 222 to reset. Since the speed at which the second valve core 222 moves away from the limiting surface 11 is less than the speed at which the first valve core 221 moves away from the limiting surface 11, the inlet port 211 and the outlet port 212 can be connected for a period of time. After the rotary motor stops and the pressure difference disappears, the passage between the inlet port 211 and the outlet port 212 of the hydraulic valve 2 is cut off again.
[0047] It is worth noting that, in order to achieve the goal that the speed at which the second valve core 222 moves away from the limiting surface 11 is less than the speed at which the first valve core 221 moves away from the limiting surface 11, the first elastic element 23 and the second elastic element 24 with different elastic forces after compression can be selected, and the difference in elastic force can be used to achieve the purpose of having a difference in reset speed.
[0048] like Figure 3 As shown, a second step 217 is provided inside the valve sleeve 21. The second valve core 222 includes a large-diameter section 2223 and a small-diameter section 2222. The small-diameter section 2222 passes through the second step 217. A damping cavity 214 is formed between the large-diameter section 2223 and the second step 217. The damping cavity 214 is connected to the oil inlet 211 through a damping hole 215. When the oil pressure at the oil inlet 211 of the anti-reverse valve is high, hydraulic oil will enter the damping cavity 214 through the damping hole 215. When the oil pressure at the oil inlet 211 disappears, the first valve core 221 will move rapidly under the drive of the first elastic element 23. The second valve core 222 needs to squeeze the hydraulic oil in the damping cavity 214. However, the speed of the hydraulic oil passing through the damping hole 215 is low, which makes the moving speed of the second valve core 222 much lower than the moving speed of the first valve core 221, thus realizing the connection between the oil inlet 211 and the oil outlet 212.
[0049] like Figure 3As shown, a first step 216 is provided inside the valve sleeve 21, which divides the main valve chamber 213 into a first valve chamber 2131 and a second valve chamber 2132. The connection between the first valve core 221 and the second valve core 222 is located in the second valve chamber 2132, and the oil outlet 212 communicates with the second valve chamber 2132, with one end of the communication hole located inside the first valve chamber 2131. This structure ensures that when the oil inlet 211 and the oil outlet 212 are connected, it will not significantly affect the state of the hydraulic oil in the first valve chamber 2131, thus ensuring the stability of the first valve core 221. This, in turn, keeps the size of the opening between the first valve core 221 and the second valve core 222 stable, thereby ensuring the stability of the hydraulic oil flow rate.
[0050] Furthermore, to ensure that the hydraulic oil in the first valve chamber 2131 can also flow, the oil outlet 212 is also connected to the first valve core 221. It is worth noting that the first step 216 can guide the first valve core 221, and the second step 217 can guide the second valve core 222, so that both the first valve core 221 and the second valve core 222 can only move along the axial direction of the valve sleeve 21.
[0051] In order for the first valve core 221 to push the second valve core 222 closer to the limiting surface 11 when the oil pressure at the oil inlet 211 is higher than the oil pressure at the oil outlet 212, the hydraulic oil pressure on the first valve core 221 is greater than the hydraulic oil pressure on the second valve core 222. That is to say, the cross-sectional area of the slide groove 2216 is larger than the cross-sectional area of the channel formed by the first step 216. At this time, when the hydraulic oil fills the slide groove 2216, the first connecting hole 2211 and the second connecting hole 2221, the oil pressure is equal everywhere. Therefore, the larger the cross-sectional area subjected to oil pressure, the greater the pressure.
[0052] As described above, when the oil pressure at the inlet 211 of a hydraulic valve 2 is higher than the oil pressure at the outlet 212, the second valve core 222 can abut against the limiting surface 11, thereby achieving the purpose of disconnecting the inlet 211 from the outlet 212. To further improve the sealing performance between the first valve core 221 and the second valve core 222, the end face of the first valve core 221 near the second valve core 222 has an inclined sealing surface 2212, and the second valve core 222 abuts against the sealing surface 2212 to form a seal between the first valve core 221 and the second valve core 222.
[0053] Understandably, when the rotary motor is operating normally, both hydraulic valves 2 need to ensure the isolation between the oil inlet 211 and the oil outlet 212 to avoid power loss of the hydraulic oil. To achieve this, a receiving cavity 2213 is provided between the first valve core 221 and the second valve core 222. A sealing element 223 is provided in the receiving cavity 2213. The second valve core 222 and the first valve core 221 are sealed together, and the sealing element 223 can block the second connecting hole 2221 of the second valve core 222.
[0054] When the oil pressure at the inlet 211 of another hydraulic valve 2 is less than the oil pressure at the outlet 212, hydraulic oil enters the receiving cavity 2213 from the outlet 212. The sealing element 223, under the action of the hydraulic oil, seals the second valve core 222, thus blocking the inlet 211 and outlet 212 of the hydraulic valve 2. It is worth noting that at this time, the second valve core 222 of the hydraulic valve 2 will also abut against the limiting surface 11 under the action of the hydraulic oil; however, the first valve core 221 is reset under the action of the first elastic element 23, and the first valve core 221 and the second valve core 222 are in a separated state.
[0055] The sealing element 223 is spherical, and the opening of the second connecting hole 2221 at one end of the receiving cavity 2213 is open to ensure that the sealing element 223 can accurately seal the second connecting hole 2221. To prevent the sealing element 223 from blocking the first connecting hole 2211, the first connecting hole 2211 is eccentrically positioned.
[0056] The working process of this anti-reverse valve is described here:
[0057] like Figures 1-3 As shown, for ease of description, one of the hydraulic valves 2 is referred to as the first hydraulic valve 2a, and the oil inlet 211 of the first hydraulic valve 2a is connected to port A, and the oil outlet 212 is connected to port B; the other hydraulic valve 2 is referred to as the second hydraulic valve 2b, and the oil inlet 211 of the second hydraulic valve 2b is connected to port B, and the oil outlet 212 is connected to port A.
[0058] When the rotary motor is working normally, the first valve core 221 of the first hydraulic valve 2a abuts against the second valve core 222, and the second valve core 222 abuts against the limiting surface 11. At this time, the oil inlet 211 and the oil outlet 212 of the first hydraulic valve 2a are disconnected. The sealing member 223 of the second hydraulic valve 2b blocks the second connecting hole 2221 of the second valve core 222, and the second valve core 222 abuts against the limiting surface 11 under the pressure of hydraulic oil. At this time, the oil inlet 211 and the oil outlet 212 of the second hydraulic valve 2b are disconnected.
[0059] When the rotary motor brakes, the first valve core 221 of the first hydraulic valve 2a disengages from the second valve core 222 under the drive of the first elastic element 23. However, at this time, the oil pressure at port B is high, and the sealing element 223 will block the second connecting hole 2221 of the second valve core 222 of the first hydraulic valve 2a, so that the hydraulic oil at port B will enter the second valve chamber 2132 through the oil inlet 211 of the second hydraulic valve 2b. Since the first valve core 221 and the second valve core 222 of the second hydraulic valve 2b are in a separated state, and the second valve core 222 is slow to reset due to the resistance of the hydraulic oil in the damping chamber 214, the second hydraulic valve 2b is in a conducting state at this time, so that the hydraulic oil at port B can flow to port A through the second hydraulic valve 2b, realizing the conduction between port A and port B of the rotary motor.
[0060] like Figure 3 As shown, the adjusting assembly 25 includes an adjusting rod 251, which is threadedly connected to the valve sleeve 21. The adjusting rod 251 can abut against the end of the first valve core 221 away from the second valve core 222. By rotating the adjusting rod 251, the adjusting rod 251 can be moved axially along the valve sleeve 21 to increase or decrease the stroke of the first valve core 221 and the compression of the first elastic member 23.
[0061] To ensure the stability of the adjusting component after adjustment, the adjusting assembly 25 also includes a locking nut 252. The locking nut 252 is sleeved on the adjusting rod 251 and threadedly connected to the adjusting rod 251. The locking nut 252 is configured to abut against the valve sleeve 21 to lock the relative position between the valve sleeve 21 and the adjusting rod 251. By rotating the locking nut 252 to abut against the valve sleeve 21, the relative position between the adjusting rod 251 and the valve sleeve 21 can be locked.
[0062] It is worth noting that existing hydraulic valves 2 do not have an adjustment assembly 25; instead, the valve sleeve 21 is sealed with a plug. To reduce improvement costs, the adjustment assembly 25 also includes a threaded sleeve 253. The threaded sleeve 253 is disposed inside the valve sleeve 21 and threadedly connected to it. The adjusting rod 251 passes through the threaded sleeve 253 and is threadedly connected to it. The locking nut 252 is configured to abut against the threaded sleeve 253 to lock the relative position between the valve sleeve 21 and the adjusting rod 251. The outer diameter of the threaded sleeve 253 is the same as that of the plug, so the plug can be directly replaced with the threaded sleeve 253 without modifying the valve sleeve 21, greatly reducing design costs.
[0063] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of this utility model. The content of this specification should not be construed as a limitation of this utility model.
Claims
1. An anti-reverse valve, comprising a valve body (1) and two hydraulic valves (2), wherein the valve body (1) is provided with a fixing groove corresponding to each of the two hydraulic valves (2), and a limiting surface (11) is provided in the fixing groove; the two hydraulic valves (2) are connected to a rotary motor in opposite directions, characterized in that, The hydraulic valve (2) includes: Valve sleeve (21), the valve sleeve (21) is disposed in the fixed groove, the valve sleeve (21) includes a main valve chamber (213) and an oil inlet (211) and an oil outlet (212) communicating with the main valve chamber (213); A valve core assembly (22) is disposed inside the valve sleeve (21). The valve core assembly (22) is provided with a connecting hole that connects the main valve chamber (213) and the oil inlet (211). The valve core assembly (22) includes a first valve core (221) and a second valve core (222) that are sealed and separable. The oil outlet (212) is connected to the connection position of the first valve core (221) and the second valve core (222). The hydraulic oil entering through the oil inlet (211) can drive the first valve core (221) and the second valve core (222) to move so that the second valve core (222) abuts against the limiting surface (11). A first elastic element (23) is disposed between the first valve core (221) and the valve sleeve (21) to drive the first valve core (221) away from the limiting surface (11); An adjustment component (25) is disposed on the valve sleeve (21) and is configured to adjust the stroke of the valve core assembly (22).
2. The anti-reverse valve according to claim 1, characterized in that, The adjusting assembly (25) includes an adjusting rod (251) which is threadedly connected to the valve sleeve (21) and is capable of abutting the end of the first valve core (221) away from the second valve core (222).
3. The anti-reverse valve according to claim 2, characterized in that, The adjusting assembly (25) further includes a locking nut (252), which is sleeved on the adjusting rod (251) and threadedly connected to the adjusting rod (251). The locking nut (252) is configured to abut against the valve sleeve (21) to lock the relative position between the valve sleeve (21) and the adjusting rod (251).
4. The anti-reverse valve according to claim 1, characterized in that, The anti-reverse valve further includes a second elastic element (24), which is disposed between the second valve core (222) and the valve body (1) to drive the second valve core (222) away from the limiting surface (11), and the speed at which the second valve core (222) moves away from the limiting surface (11) is less than the speed at which the first valve core (221) moves away from the limiting surface (11).
5. The anti-reverse valve according to claim 4, characterized in that, The valve sleeve (21) is provided with a second step (217), and the second valve core (222) includes a large diameter section (2223) and a small diameter section (2222). The small diameter section (2222) passes through the second step (217), and a damping cavity (214) is formed between the large diameter section (2223) and the second step (217). The damping cavity (214) is connected to the oil inlet (211) through a damping hole (215).
6. The anti-reverse valve according to claim 1, characterized in that, The valve sleeve (21) is provided with a first step (216), which divides the main valve chamber (213) into a first valve chamber (2131) and a second valve chamber (2132). The connection position of the first valve core (221) and the second valve core (222) is located in the second valve chamber (2132). The oil outlet (212) is connected to the second valve chamber (2132), and one end of the connecting hole is located in the first valve chamber (2131).
7. The anti-reverse valve according to claim 1, characterized in that, The end face of the first valve core (221) near the second valve core (222) has an inclined sealing surface (2212), and the second valve core (222) abuts against the sealing surface (2212) to form a seal between the first valve core (221) and the second valve core (222).
8. The anti-reverse valve according to claim 1, characterized in that, There is a receiving cavity (2213) between the first valve core (221) and the second valve core (222), and a sealing member (223) is provided in the receiving cavity (2213). The second valve core (222) and the first valve core (221) are sealed and abutted together. The sealing member (223) can block the second connecting hole (2221) of the second valve core (222).
9. The anti-reverse valve according to claim 1, characterized in that, The first valve core (221) includes a valve core body (2214) and a push rod (2215). The valve core body (2214) has a sliding groove at one end near the adjusting component (25). The push rod (2215) is slidably disposed in the sliding groove and is in clearance fit with the inner wall of the sliding groove. The push rod (2215) abuts against the adjusting component (25).
10. The anti-reverse valve according to claim 9, characterized in that, The outer periphery of the push rod (2215) is provided with multiple oil storage tanks (22151) spaced apart along the axial direction.