Hydraulic cylinder oil circuit lock valve group

Abstract

The application discloses a hydraulic cylinder oil circuit lock valve group, and belongs to the technical field of lock valve groups. The lock valve group comprises a valve body, an oil cavity one and an oil cavity two which are fixedly arranged in the valve body and are in communication with each other, an oil inlet channel which is arranged on the valve body and is in communication with the oil cavity one and is used for hydraulic cylinder oil inlet, an oil return channel which is arranged on the valve body and is in communication with the oil cavity two and is used for hydraulic cylinder oil outlet, a valve core assembly which is symmetrically arranged and is respectively located in the oil cavity one and the oil cavity two, and a piston rod which is slidably connected in the oil cavity one and the oil cavity two and is located between the two valve core assemblies and is used for transmitting the oil liquid thrust in the oil cavity one to the oil cavity two, so that the two valve core assemblies are synchronously opened. The hydraulic cylinder oil circuit lock valve group is provided with two adjusting structures, the movement resistance of the two valve core assemblies is adjusted, the influence on the valve core assembly is prevented, and the hydraulic cylinder retraction action is prevented from being delayed.

Description

Technical Field

[0001] This application relates to the field of locking valve assembly technology, specifically a hydraulic cylinder oil circuit locking valve assembly. Background Technology

[0002] In hydraulic transmission systems, the hydraulic cylinder, as an actuator, directly depends on the reliability of the oil circuit lock-up valve assembly for its operational stability and position holding capability. The lock-up valve assembly achieves precise cylinder locking by controlling the opening and closing of the oil circuit. The opening and closing of its valve core relies on the dynamic balance between spring force and hydraulic pressure: when flow is open, the hydraulic pressure overcomes the spring preload to push the valve core open; when locked, the spring force drives the valve core to reset and seal. At the same time, the spring force must overcome the viscous resistance of the oil to ensure timely action and sealing.

[0003] However, the viscosity of the oil fluctuates with the ambient temperature, but the valve core resistance of the existing lock-up valve assembly is a fixed value. This makes it prone to problems under extreme temperature conditions: at low temperatures, the oil viscosity is high. When the inlet valve core is closed and locked, it needs to overcome the increased viscous resistance. The valve core is prone to not being able to quickly fit the valve seat due to excessive resistance, resulting in a slow locking action. The oil slowly leaks through the gap between the valve core and the valve body, eventually causing the cylinder position to shift. At high temperatures, the oil viscosity is low. When the outlet valve core is opened, the valve core is prone to fit too tightly with the valve seat. The oil thrust needs to overcome a larger spring preload to push the valve core open, resulting in a slow valve core opening and a slow cylinder retraction action.

[0004] Therefore, this application provides a hydraulic cylinder oil circuit lock-up valve assembly to solve the above problems. Utility Model Content

[0005] This application provides a hydraulic cylinder oil circuit lock-up valve assembly, which aims to solve the problems mentioned in the background art, such as the existing lock-up valve assembly being unable to adapt to the oil viscosity that fluctuates with the ambient temperature due to the fixed valve core resistance, resulting in slow locking of the inlet valve core and cylinder deviation at low temperatures, and slow opening of the outlet valve core and slow retraction of the cylinder at high temperatures.

[0006] To achieve the above objectives, this application provides the following technical solution: a hydraulic cylinder oil circuit lock-up valve assembly, comprising a valve body, an oil chamber one and an oil chamber two fixedly disposed within the valve body and communicating with each other, an oil inlet channel disposed on the valve body and communicating with the oil chamber one for hydraulic cylinder oil inlet, an oil return channel disposed on the valve body and communicating with the oil chamber two for hydraulic cylinder oil outlet, valve core assemblies symmetrically disposed and respectively located within the oil chamber one and the oil chamber two, and a piston rod slidably connected within the oil chamber one and the oil chamber two and located between the two valve core assemblies for transmitting the oil thrust in the oil chamber one to the oil chamber two, thereby causing the two valve core assemblies to open synchronously;

[0007] The locking valve assembly also includes adjustment structures respectively located at both ends of the valve body for adjusting the moving resistance of the two valve core assemblies, and locking structures located on the adjustment structures and valve core assemblies for locking the adjustment position of the adjustment structures. The two valve core assemblies are connected by a piston rod, allowing the oil thrust in oil chamber one to be transmitted to oil chamber two, achieving synchronous opening of the valve core assemblies and avoiding oil circuit imbalance caused by delays in the action of a single valve core. Simultaneously, by setting two adjustment structures to adjust the moving resistance of the two valve core assemblies respectively, the influence on the valve core assemblies is prevented from causing sluggish retraction of the oil cylinder. The locking structure design can lock the adjustment position of the adjustment structure to prevent accidental movement of the adjustment structure, thereby ensuring that the set value of the moving resistance of the valve core assembly remains stable, enhancing the stability and reliability of the locking valve assembly.

[0008] Preferably, to ensure that hydraulic oil can stably and smoothly enter the oil chamber 1 from the outside and provide continuous and reliable power to the hydraulic cylinder, the oil inlet channel includes an inlet 1 fixedly disposed on one side of the valve body and an outlet 1 fixedly disposed on the side of the valve body away from the inlet 1 for communicating with the hydraulic cylinder inlet. The ends of the inlet 1 and the outlet 1 away from the hydraulic cylinder inlet are respectively connected to both sides of the oil chamber 1. The oil inlet channel is provided with an inlet 1 for receiving external hydraulic oil and an outlet 1 connected to the hydraulic cylinder inlet. The ends of the inlet 1 and the outlet 1 away from the hydraulic cylinder inlet are respectively connected to both sides of the oil chamber 1. When the system supplies oil, the oil enters the oil chamber 1 from the inlet 1, pushes the corresponding valve core assembly to open, and then reaches the cylinder inlet through the outlet. This design ensures that the path of hydraulic oil entering the oil chamber 1 is clear, can stably supply oil to the hydraulic cylinder, and ensures the normal operation of the system.

[0009] Preferably, in order to achieve smooth return of hydraulic oil in the hydraulic cylinder and maintain the pressure balance of the hydraulic system, ensuring the system's cyclic operation, the return oil channel includes an inlet two fixedly installed on the valve body and located on one side of the outlet for communication with the hydraulic cylinder outlet, and an outlet two fixedly installed on the valve body and located on one side of the inlet. The end of the inlet two away from the hydraulic cylinder outlet and the outlet two are respectively connected to both sides of the oil chamber two. The inlet two of the return oil channel is connected to the hydraulic cylinder outlet, and the outlet two is used to discharge hydraulic oil. The end of the inlet two away from the hydraulic cylinder outlet and the outlet two are respectively connected to both sides of the oil chamber two. When the cylinder retracts, the return oil can enter the oil chamber two from the inlet two, push the valve core assembly to open, and then be discharged through the outlet two. This design ensures the smoothness of hydraulic oil return, effectively maintains the pressure balance of the hydraulic system, avoids system failure due to abnormal pressure, and improves the stability and reliability of the system.

[0010] Preferably, to achieve the opening and closing of the valve core and ensure the reliability of locking and flow, the valve core assembly includes a valve seat fixedly disposed at both ends of the valve body, a fixed shaft fixedly disposed on the valve seat near the interior of the valve body, a valve core passing through the end of the valve seat away from the fixed shaft and slidably connected to the valve seat and the interior of the valve body, and a spring sleeved on the fixed shaft and fixedly connected to the valve core. The valve seat is fixed at both ends of the valve body, the fixed shaft provides support, and the valve core can slide inside the valve seat and the valve body. When the hydraulic oil pressure overcomes the preload of the spring, the valve core is pushed open, and the oil circuit is opened. When the pressure decreases, the spring force causes the valve core to return to its original position, and the oil circuit is closed. This design ensures that the hydraulic cylinder can quickly cut off the oil circuit when locking is required and can promptly open the oil circuit when action is required, improving the safety and operational accuracy of the system.

[0011] Preferably, to adjust the movement resistance of the valve core assembly, the adjustment structure includes a sleeve block disposed within the valve seat and fitted onto the fixed shaft, a sliding block fixedly disposed inside the sleeve block and slidably connected to the fixed shaft, a lead screw rotatably connected to the fixed shaft and screwed to the sliding block, a connecting shaft passing through the valve seat and rotatably connected to the valve seat, and a knob disposed outside the valve seat and fixedly connected to the connecting shaft. The end of the spring away from the valve core is fixedly connected to the sleeve block, and the end of the connecting shaft away from the knob is fixedly connected to the lead screw. By rotating the knob, the connecting shaft and the lead screw rotate. Since the sliding block is screwed to the lead screw and slidably connected to the fixed shaft, the rotation of the lead screw causes the sliding block and the sleeve block to move along the fixed shaft, thereby changing the preload of the spring and adjusting the movement resistance of the valve core assembly. This design allows the system to adapt to the working requirements of different ambient temperatures, reduces the influence of viscous resistance on the valve core assembly, prevents sluggish cylinder retraction, and improves the adaptability and reliability of the system.

[0012] Preferably, to ensure the sliding block slides stably and accurately on the fixed shaft and to prevent deviation and detachment, a guide groove is provided on the fixed shaft. The sliding block is slidably connected in the guide groove, and the lead screw is rotatably connected in the guide groove. The guide groove design provides a precise sliding track for the sliding block, restricting the direction of movement of the sliding block so that it can only slide along the direction of the guide groove. This prevents the sliding block from deflecting when the lead screw rotates, ensuring the stability of the force exerted by the sleeve on the spring. At the same time, the guide groove limits and constrains the sliding block, confining it within the guide groove. This ensures that no matter how the lead screw rotates, the sliding block can only slide within the range of the guide groove and will not detach from the fixed shaft, thereby improving the working safety and continuity of the lock valve assembly.

[0013] Preferably, in order to fix the adjustment position of the adjustment structure and prevent its accidental movement, the locking structure includes a thread fixedly disposed on the outer side of the connecting shaft near the knob end, and a locking nut sleeved on the connecting shaft at the corresponding thread position for threaded connection and abutment against the valve seat. With this design, after the adjustment structure is adjusted, the locking nut can be tightened along the thread and pressed against the valve seat, locking the connecting shaft through friction, thereby restricting the rotation of the connecting shaft, thus fixing the position of the adjustment structure, preventing the knob from rotating due to vibration, oil impact, or other factors, ensuring that the spring preload remains at the set value, and enhancing the stability and reliability of the locking valve assembly.

[0014] The hydraulic cylinder oil circuit lock-up valve assembly connects two valve core assemblies through a piston rod, which can transmit the oil thrust in oil chamber one to oil chamber two, realize the synchronous opening of the valve core assemblies, and avoid oil circuit imbalance caused by the delay of single valve core action;

[0015] The hydraulic cylinder oil circuit lock-up valve assembly uses two adjustment structures to adjust the movement resistance of the two valve core assemblies, thereby reducing the impact on the valve core assemblies and preventing the cylinder retraction action from being slow.

[0016] The hydraulic cylinder oil circuit lock-up valve assembly, through its locking structure design, can lock the adjustment position of the adjustment structure to prevent accidental movement of the adjustment structure, thereby ensuring that the set value of the valve core assembly's movement resistance remains stable and enhancing the stability and reliability of the lock-up valve assembly. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a hydraulic cylinder oil circuit lock-up valve assembly;

[0018] Figure 2 A cross-sectional structural schematic diagram of a hydraulic cylinder oil circuit lock-up valve assembly;

[0019] Figure 3 A schematic cross-sectional view of the valve body in a hydraulic cylinder oil circuit lock-up valve assembly.

[0020] Figure 4 A cross-sectional schematic diagram of the regulating structure in a hydraulic cylinder oil circuit lock-up valve assembly;

[0021] Figure 5 This is a cross-sectional schematic diagram of the locking structure in a hydraulic cylinder oil circuit lock-up valve assembly.

[0022] In the picture:

[0023] 1. Valve body;

[0024] 2. Oil cavity one;

[0025] 3. Oil cavity two;

[0026] 4. Oil inlet channel; 41. Inlet 1; 42. Outlet 1;

[0027] 5. Return oil channel; 51. Inlet 2; 52. Outlet 2;

[0028] 6. Valve core assembly; 61. Valve seat; 62. Fixed shaft; 621. Guide groove; 63. Spring; 64. Valve core;

[0029] 7. Piston rod;

[0030] 8. Adjustment structure; 81. Sleeve block; 82. Sliding block; 83. Lead screw; 84. Connecting shaft; 85. Knob;

[0031] 9. Locking structure; 91. Thread; 92. Locking nut. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] This embodiment provides a hydraulic cylinder oil circuit lock-up valve assembly, such as... Figures 1-5 As shown, the locking valve assembly includes a valve body 1, two oil chambers 2 and 3 fixedly disposed within the valve body 1 and interconnected, an oil inlet channel 4 disposed on the valve body 1 and connected to the oil chamber 2 for hydraulic cylinder oil inlet, an oil return channel 5 disposed on the valve body 1 and connected to the oil chamber 3 for hydraulic cylinder oil outlet, valve core assemblies 6 symmetrically arranged and respectively located within the oil chambers 2 and 3, and a piston rod 7 slidably connected within the oil chambers 2 and 3 and located between the two valve core assemblies 6 for transmitting the hydraulic thrust in the oil chamber 2 to the oil chamber 3, thereby causing the two valve core assemblies 6 to open synchronously; the locking valve assembly also includes an adjustment structure 8 disposed at both ends of the valve body 1 for adjusting the moving resistance of the two valve core assemblies 6, and a locking structure 9 disposed on the adjustment structure 8 and the valve core assemblies 6 for locking the adjustment position of the adjustment structure 8.

[0034] To ensure that hydraulic oil can stably and smoothly enter the oil chamber 2 from the outside and provide continuous and reliable power to the hydraulic cylinder, the oil inlet channel 4 includes an inlet 41 fixedly installed on one side of the valve body 1 and an outlet 42 fixedly installed on the side of the valve body 1 away from the inlet 41 for connecting with the hydraulic cylinder inlet. The ends of the inlet 41 and the outlet 42 away from the hydraulic cylinder inlet are respectively connected to both sides of the oil chamber 2. The oil inlet channel 4 is provided with an inlet 41 for receiving external hydraulic oil and an outlet 42 connected to the hydraulic cylinder inlet. The ends of the inlet 41 and the outlet 42 away from the hydraulic cylinder inlet are respectively connected to both sides of the oil chamber 2. When the system supplies oil, the oil enters the oil chamber 2 from the inlet 41, pushes the corresponding valve core assembly 6 to open, and then directly reaches the hydraulic cylinder inlet through the outlet 42. This design ensures that the path of hydraulic oil entering the oil chamber 2 is clear, and can stably supply oil to the hydraulic cylinder, ensuring the normal operation of the system.

[0035] In addition, to ensure smooth return of hydraulic oil in the hydraulic cylinder and maintain pressure balance in the hydraulic system, thus guaranteeing system cyclic operation, the return oil channel 5 includes an inlet 51 fixedly mounted on the valve body 1 and located on the side of outlet 42 for communication with the hydraulic cylinder outlet, and an outlet 52 fixedly mounted on the valve body 1 and located on the side of inlet 41. The end of inlet 51 furthest from the hydraulic cylinder outlet and outlet 52 are respectively connected to both sides of oil chamber 3. Inlet 51 of the return oil channel 5 is connected to the hydraulic cylinder outlet, and outlet 52 is used to discharge hydraulic oil. The end of inlet 51 furthest from the hydraulic cylinder outlet and outlet 52 are respectively connected to both sides of oil chamber 3. When the cylinder retracts, the return oil can enter oil chamber 3 from inlet 51, push the valve core assembly 6 to open, and then be discharged through outlet 52. This design ensures smooth hydraulic oil return, effectively maintains pressure balance in the hydraulic system, avoids system failure due to abnormal pressure, and improves system stability and reliability.

[0036] During operation, when the hydraulic system is working, hydraulic oil enters the valve body 1 through inlet 41 of the inlet channel 4. Since inlet 41 and outlet 42, the ends furthest from the hydraulic cylinder inlet, are connected to both sides of oil chamber 2, the hydraulic oil flows into oil chamber 2. The pressure inside oil chamber 2 increases, and the resulting hydraulic thrust pushes the valve core assembly 6 within oil chamber 2. Simultaneously, it acts on one end of the piston rod 7, pushing it to slide towards oil chamber 3. During this sliding process, the piston rod 7 transmits the hydraulic thrust from oil chamber 2 to oil chamber 3, causing the valve core assembly 6 within oil chamber 3 to be simultaneously subjected to thrust. The two valve core assemblies 6 experience thrust in opposite directions. When the thrust overcomes the resistance to movement of the valve core assembly 6 itself, both valve core assemblies 6 open simultaneously. At this time, oil chamber 2 is connected to the inlet channel 4, while oil chamber 3 is connected to the return channel 5. Hydraulic oil then flows through oil chamber 2 into outlet 42. The hydraulic oil then enters the hydraulic cylinder through outlet 42, while the hydraulic oil in the hydraulic cylinder enters the oil chamber 3 through inlet 51 and flows out through outlet 52, realizing the oil discharge action of the hydraulic cylinder. When the system needs to be locked, the oil supply channel 4 stops supplying oil, and the two valve core assemblies 6 close under their own elastic restoring force, blocking the oil flow between oil chamber 2 and oil chamber 3. However, when using this locking valve assembly, the movement resistance of the two valve core assemblies 6 can be adjusted by the adjustment structure 8 set at both ends of the valve body 1 to adapt to the viscosity change caused by temperature fluctuations, ensure the movement of the valve core assemblies 6, and prevent the cylinder retraction action from being slow. Furthermore, after the adjustment structure 8 is adjusted, the adjustment position of the adjustment structure 8 can be locked by the corresponding locking structure 9 to ensure the stability of the movement resistance of the valve core assembly 6 and ensure the normal operation of the locking valve assembly.

[0037] Specifically, the valve core assembly 6 includes a valve seat 61 fixedly disposed at both ends of the valve body 1, a fixed shaft 62 fixedly disposed on the valve seat 61 near the inside of the valve body 1, a valve core 64 passing through the end of the valve seat 61 away from the fixed shaft 62 and slidably connected to the valve seat 61 and the inside of the valve body 1, and a spring 63 sleeved on the fixed shaft 62 and fixedly connected to the valve core 64.

[0038] It is worth noting that the valve cores 64 of the two valve core assemblies 6 are slidably connected in oil chamber 1 2 and oil chamber 2 3 respectively, and the piston rod 7 is located between the two valve cores 64.

[0039] During the operation of the hydraulic cylinder oil circuit lock-up valve assembly, after the hydraulic oil enters the valve body 1, the pressure in oil chamber 2 increases. This pressure acts on the valve core 64 of the valve core assembly 6 located in oil chamber 2, causing the valve core 64 to slide away from the interior of the valve body 1. During this process, the valve core 64 synchronously compresses the spring 63 sleeved on the fixed shaft 62 and fixedly connected to it. As the valve core 64 moves, the inlet 41 and outlet 42 connect, allowing hydraulic oil to enter the hydraulic cylinder inlet through outlet 42, providing power for the cylinder's extension and retraction. Simultaneously, since the piston rod 7 is located between the two valve cores 64, the increased hydraulic oil pressure in oil chamber 2 synchronously pushes the piston rod 7 towards oil chamber 3, thus extending the cylinder's reach. The stopper rod 7 then acts on the valve core 64 of the valve core assembly 6 located in the second oil chamber 3, pushing the valve core 64 to move away from the interior of the valve body 1. Similarly, the valve core 64 will also compress the corresponding spring 63. As the valve core 64 moves, the inlet 51 and outlet 52 of the return oil channel 5 are connected. The return oil in the hydraulic cylinder can then enter the second oil chamber 3 through the inlet 51 and be discharged through the outlet 52, completing the circulation of hydraulic oil and achieving stable operation of the cylinder. When the system needs to be locked, the valve cores 64 on the two valve core assemblies 6, under the elastic reset action of the corresponding springs 63, push the corresponding valve cores 64 to move and block, thereby blocking the flow of oil between the first oil chamber 2 and the second oil chamber 3.

[0040] Furthermore, the adjusting structure 8 includes a sleeve block 81 disposed inside the valve seat 61 and sleeved on the fixed shaft 62, a sliding block 82 fixedly disposed inside the sleeve block 81 and slidably connected to the fixed shaft 62, a lead screw 83 rotatably connected to the fixed shaft 62 and screwed to the sliding block 82, a connecting shaft 84 passing through the valve seat 61 and rotatably connected to the valve seat 61, and a knob 85 disposed outside the valve seat 61 and fixedly connected to the connecting shaft 84. The end of the spring 63 away from the valve core 64 is fixedly connected to the sleeve block 81, and the end of the connecting shaft 84 away from the knob 85 is fixedly connected to the lead screw 83. A guide groove 621 is provided on the fixed shaft 62, the sliding block 82 is slidably connected in the guide groove 621, and the lead screw 83 is rotatably connected in the guide groove 621.

[0041] When it is necessary to adjust the moving resistance of the valve core assembly 6 to adapt to changes in oil viscosity, the knob 85 located on the outside of the valve seat 61 is rotated. At this time, the knob 85 will drive the connecting shaft 84 fixedly connected to it to rotate within the valve seat 61. Thus, the end of the connecting shaft 84 away from the knob 85 will synchronously drive the lead screw 83 to rotate synchronously within the guide groove 621 of the fixed shaft 62. Since the lead screw 83 is screwed to the sliding block 82, and the sliding block 82 is slidably connected within the guide groove 621, the rotation of the lead screw 83 will be converted into the axial movement of the sliding block 82 along the guide groove 621, thereby causing the sliding block to rotate. The sliding motion of the sleeve 81, which is fixedly connected to the sleeve 82, causes the sleeve 81 to move on the fixed shaft 62. The end of the spring 63 away from the valve core 64 is fixedly connected to the sleeve 81. When the sleeve 81 moves, it will compress or stretch the spring 63. When the sleeve 81 moves towards the valve core 64, the spring 63 is further compressed, the preload increases, and the moving resistance of the valve core 64 increases accordingly. When the sleeve 81 moves away from the valve core 64, the compression of the spring 63 decreases, the preload decreases, and the moving resistance of the valve core 64 decreases accordingly, thus realizing the adjustment of the moving resistance of the valve core assembly 6.

[0042] Furthermore, the locking structure 9 includes a thread 91 fixedly disposed on the outer side of the connecting shaft 84 near the knob 85, and a locking nut 92 sleeved on the connecting shaft 84 at the position corresponding to the thread 91 for thread 91 to be screwed into and abutted against the valve seat 61.

[0043] After the adjustment operation of the adjustment structure 8 is completed, that is, after rotating the knob 85 to drive the connecting shaft 84 to rotate and adjust the relevant components to the appropriate position, since the connecting shaft 84 has a thread 91 on the outer side near the knob 85, and the locking nut 92 is sleeved on the connecting shaft 84 and adapted to the thread 91, the locking nut 92 sleeved on the connecting shaft 84 at the position corresponding to the thread 91 can be rotated to perform a rotation tightening operation along the thread 91 on the connecting shaft 84. As the locking nut 92 continues to rotate, it will gradually press against the valve seat 61. Through the screw connection between the locking nut 92 and the thread 91 and its pressing force against the valve seat 61, the connecting shaft 84 is fixed in the current position, preventing the connecting shaft 84 from rotating due to external factors, thereby locking the adjustment position of the adjustment structure 8 and ensuring that the movement resistance of the valve core assembly 6 remains stable. When it is necessary to operate the knob 85 of the adjustment structure 8, simply rotate the locking nut 92 in the opposite direction to gradually move the locking nut 92 away from the valve seat 61, and the pressing force against the valve seat 61 can be released.

[0044] It should be added that sealing rings are provided between the valve core 64 and the valve seat 61, between the valve seat 61 and the valve body 61, between the lead screw 83 and the fixed shaft 62, and between the connecting shaft 84 and the valve seat 61 to ensure the sealing of the valve assembly.

[0045] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A hydraulic cylinder oil circuit lock-up valve assembly, characterized in that: The system includes a valve body (1), two oil chambers (2) and two oil chambers (3) fixedly disposed in the valve body (1) and connected to each other, an oil inlet channel (4) disposed on the valve body (1) and connected to the oil chamber (2) for hydraulic cylinder oil inlet, an oil return channel (5) disposed on the valve body (1) and connected to the oil chamber (3) for hydraulic cylinder oil outlet, a valve core assembly (6) symmetrically disposed and located in the oil chambers (2) and (3) respectively, and a piston rod (7) slidably connected in the oil chambers (2) and (3) and located between the two valve core assemblies (6) for transmitting the oil thrust in the oil chamber (2) to the oil chamber (3) so that the two valve core assemblies (6) open synchronously; The locking valve assembly further includes an adjustment structure (8) disposed at both ends of the valve body (1) for adjusting the moving resistance of the two valve core assemblies (6), and a locking structure (9) disposed on the adjustment structure (8) and the valve core assembly (6) for locking the adjustment position of the adjustment structure (8).

2. The hydraulic cylinder oil circuit lock-up valve assembly according to claim 1, characterized in that: The oil inlet channel (4) includes an inlet (41) fixedly disposed on one side of the valve body (1) and an outlet (42) fixedly disposed on the side of the valve body (1) away from the inlet (41) for communicating with the oil inlet of the hydraulic cylinder. The ends of the inlet (41) and the outlet (42) away from the oil inlet of the hydraulic cylinder are respectively connected to both sides of the oil chamber (2).

3. The hydraulic cylinder oil circuit lock-up valve assembly according to claim 2, characterized in that: The return oil channel (5) includes an inlet (51) fixedly installed on the valve body (1) and located on the side of the outlet (42) for communicating with the oil outlet of the hydraulic cylinder, and an outlet (52) fixedly installed on the valve body (1) and located on the side of the inlet (41). The end of the inlet (51) away from the oil outlet of the hydraulic cylinder and the outlet (52) are respectively connected to both sides of the oil chamber (3).

4. The hydraulic cylinder oil circuit lock-up valve assembly according to claim 1, characterized in that: The valve core assembly (6) includes a valve seat (61) fixedly disposed at both ends of the valve body (1), a fixed shaft (62) fixedly disposed on the valve seat (61) near the interior of the valve body (1), a valve core (64) passing through the end of the valve seat (61) away from the fixed shaft (62) and slidably connected to the valve seat (61) and the interior of the valve body (1), and a spring (63) sleeved on the fixed shaft (62) and fixedly connected to the valve core (64).

5. The hydraulic cylinder oil circuit lock-up valve assembly according to claim 4, characterized in that: The adjusting structure (8) includes a sleeve (81) disposed inside the valve seat (61) and sleeved on the fixed shaft (62), a sliding block (82) fixedly disposed inside the sleeve (81) and slidably connected to the fixed shaft (62), a lead screw (83) rotatably connected to the fixed shaft (62) and screwed to the sliding block (82), a connecting shaft (84) passing through the valve seat (61) and rotatably connected to the valve seat (61), and a knob (85) disposed outside the valve seat (61) and fixedly connected to the connecting shaft (84). One end of the spring (63) away from the valve core (64) is fixedly connected to the sleeve (81), and one end of the connecting shaft (84) away from the knob (85) is fixedly connected to the lead screw (83).

6. The hydraulic cylinder oil circuit lock-up valve assembly according to claim 5, characterized in that: The fixed shaft (62) is provided with a guide groove (621), the sliding block (82) is slidably connected in the guide groove (621), and the lead screw (83) is rotatably connected in the guide groove (621).

7. The hydraulic cylinder oil circuit lock-up valve assembly according to claim 5, characterized in that: The locking structure (9) includes a thread (91) fixedly disposed on the outside of the end of the connecting shaft (84) near the knob (85) and a locking nut (92) sleeved on the connecting shaft (84) at the position corresponding to the thread (91) for thread (91) screwing and abutting against the valve seat (61).

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