Counterbalance valve for hydraulic lifting platform

Abstract

The utility model discloses a counterbalance valve for a hydraulic lifting platform, and relates to the technical field of counterbalance valves. The valve comprises a valve block, an adjusting bin is formed in the valve block, a valve element bin is formed in the valve block, the adjusting bin is installed above the valve element bin, a guide cylinder is fixedly connected to the interior of the adjusting bin, a sealing ring groove is formed between the adjusting bin and the guide cylinder, and a pair of rubber sealing rings are fixedly connected to the inner wall of the sealing ring groove. After a locking nut is unscrewed to remove fixed connection between an adjusting screw rod and an adjusting bin, the adjusting screw rod is rotated to form threaded connection with a first pressure guide hole, one end of an adjusting cylinder is pushed to be inserted into a sealing ring groove, an adjusting spring is extruded to push a transmission plate to abut against one end of a through pipe, and the adjusting spring generates contraction deformation; and meanwhile, one end of the adjusting cylinder extrudes the rubber sealing ring to generate deformation, and the rubber sealing ring is filled in the sealing ring groove, so that the sealing performance between the adjusting screw rod and the valve block is effectively improved, and the safety of the device is improved.

Description

Technical Field

[0001] This application relates to the field of counterbalance valve technology, and in particular to a counterbalance valve for a hydraulic lifting platform. Background Technology

[0002] Hydraulic lifting platforms, widely used in industrial lifting and unloading machinery, operate on the principle of Pascal's principle, which states that pressure within a fluid can be transmitted evenly. These platforms achieve rapid lifting and lowering via a hydraulic system, offering advantages such as high efficiency, strong load-bearing capacity, ease of operation, high safety, and simple maintenance. During operation, the counterbalancing valve plays a crucial role, regulating flow and pressure within the hydraulic system to ensure smooth lifting and safe operation of the platform.

[0003] Currently, the counterbalancing valves used in hydraulic lifting platforms primarily control the pressure in the hydraulic system by balancing hydraulic pressure and spring force. These valves consist of a main valve core, valve seat, and spring. The main valve core moves under hydraulic pressure, changing the opening degree with the valve seat, thereby regulating flow and pressure. The screw component plays a regulating role in this process; by changing the position of the screw, the preload of the spring can be adjusted, thus changing the force that the main valve core needs to overcome, achieving regulation of the opening pressure. Furthermore, counterbalancing valves are typically used in conjunction with relief valves, safety valves, and other components to jointly control and stabilize the pressure and flow in the hydraulic system.

[0004] Although existing technology has achieved the basic functions of counterbalance valves, some technical problems still exist in practical use. In particular, when the screw is driven to rotate by external force, there is a gap between the screw and the valve body, which can easily cause leakage and affect the sealing and safety of the device. Utility Model Content

[0005] The purpose of this application is to provide a counterbalance valve for a hydraulic lifting platform, which addresses the problem that when the screw is driven to rotate by external force, there is a gap between the screw and the valve body, which easily leads to leakage and affects the sealing and safety of the device.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution:

[0007] A counterbalancing valve for a hydraulic lifting platform includes a valve block with an adjustment chamber and a valve core chamber inside. The adjustment chamber is mounted above the valve core chamber. A guide cylinder is fixedly connected inside the adjustment chamber. A sealing ring groove is formed between the adjustment chamber and the guide cylinder. A pair of rubber sealing rings are fixedly connected to the inner wall of the sealing ring groove. The adjustment cylinder is inserted inside the sealing ring groove. An adjustment spring is fixedly connected inside the adjustment cylinder. A transmission plate is fixedly connected to the bottom of the adjustment spring and slidably connected to the guide cylinder. Inside, the bottom of the guide cylinder is fixedly connected to a through pipe communicating with the inside of the valve core chamber. A hollow valve core is slidably sleeved on one end of the through pipe. The hollow valve core is installed inside the valve core chamber. A pressure guiding hole 1 is symmetrically opened on one end of the hollow valve core. A pressure guiding hole 2, which is adapted to the pressure guiding hole 1, is symmetrically opened on the inner side of the valve core chamber. An adjusting screw is rotatably connected to the top of the adjusting cylinder. One end of the adjusting screw is threadedly connected to the valve block and passes through the valve block. A locking nut is threadedly connected to the end of the adjusting screw that passes through the valve block. A guide assembly is installed inside the adjusting chamber.

[0008] By adopting the above technical solution, and through the coordinated use of the guide component, adjusting cylinder, rubber sealing ring, and sealing ring groove, it is convenient to loosen the locking nut to release the fixed connection between the adjusting screw and the adjusting chamber. Then, by rotating the adjusting screw to form a threaded connection with the pressure guide hole, one end of the adjusting cylinder is pushed into the sealing ring groove, and the adjusting spring is squeezed to push the transmission plate into contact with one end of the through pipe. This causes the adjusting spring to contract and deform, and at the same time, one end of the adjusting cylinder squeezes the rubber sealing ring to deform and fill the inside of the sealing ring groove. This effectively improves the sealing performance between the adjusting screw and the valve block, and enhances the safety of the device.

[0009] Furthermore, the guiding component includes guide grooves symmetrically formed on the inner wall of the regulating chamber, and guide sliders are symmetrically fixedly connected to one end of the regulating cylinder, the guide sliders being slidably connected inside the guide grooves.

[0010] By adopting the above technical solution, and by setting the guide groove and guide slider to work together, when the adjusting screw is rotated to push the adjusting cylinder to move, the adjusting cylinder is guided by the guide slider to move along the length direction of the guide groove, thereby reducing the situation where the adjusting cylinder rotates inside the adjusting chamber, which affects the sealing effect between the adjusting cylinder and the sealing ring groove.

[0011] Furthermore, a limiting ring is fixedly connected to the inner top of the guide tube, and the limiting ring abuts against one end of the transmission plate.

[0012] By adopting the above technical solution and using the combination of the limiting ring and the transmission plate, the occurrence of the transmission plate detaching from the guide cylinder is effectively reduced, thus improving the practicality of the device.

[0013] Furthermore, a buffer guide cylinder is fixedly connected to the bottom of the valve core chamber, and a buffer slot adapted to the buffer guide cylinder is opened at the bottom of the hollow valve core. A follower spring is fixedly connected inside the buffer guide cylinder, and one end of the follower spring is fixedly connected to the hollow valve core.

[0014] By adopting the above technical solution, and by setting the follower spring and the buffer guide cylinder to work together, when the oil passes through the pressure guide hole one and pressure guide hole two through the hollow valve core and pushes the hollow valve core to apply oil pressure, the elastic characteristics of the buffer guide cylinder are used to absorb and offset part of the pressure, so as to slow down the movement of the hollow valve core along the length of the buffer guide cylinder and improve the stability of the device.

[0015] Furthermore, a buffer slider is symmetrically fixedly connected to the inner side of the buffer slot, and a buffer groove adapted to the buffer slider is symmetrically opened on the outer side of the buffer guide cylinder. A damping rubber strip is symmetrically fixedly connected to the inner side of the buffer groove, and the buffer slider is inserted between the two damping rubber strips.

[0016] By adopting the above technical solution, and by setting the buffer slider and the damping rubber strip to work together, when the hollow valve core drives the buffer slider to move along the length of the buffer groove, the elastic properties of the damping rubber strip are utilized to make the damping rubber strip rebound and resist the buffer slider, thereby increasing the resistance between the buffer slider and the buffer groove. This further reduces the amplitude of the hollow valve core moving along the length of the buffer guide cylinder, thus improving the stability of the device.

[0017] Furthermore, the bottom of the tube is configured as a conical structure and has multiple guide holes evenly distributed thereon, with the multiple guide holes arranged in a circular pattern.

[0018] By adopting the above technical solution and using the combination of guide holes and through pipes, the flow volume of oil entering the guide cylinder through the through pipe is effectively increased, and the smoothness of oil flowing through the through pipe is improved.

[0019] Furthermore, a T-shaped fixing screw is fixedly connected to one end of the valve block, and a sealing rubber gasket is fitted onto one end of the T-shaped fixing screw.

[0020] By adopting the above technical solution, and by setting the T-shaped fixing screw and the sealing rubber gasket to work together, when the rotating valve block drives the T-shaped fixing screw to form a threaded connection with the valve seat, the T-shaped fixing screw squeezes the sealing rubber gasket to deform and fill the space between the T-shaped fixing screw and the valve seat, thereby further improving the sealing performance of the device.

[0021] Furthermore, the surface of the valve block is coated with an epoxy resin coating.

[0022] By adopting the above technical solution, the corrosion resistance of the valve block surface is effectively improved by setting an epoxy resin coating, thus extending the service life of the device.

[0023] In summary, this application includes at least one of the following beneficial effects:

[0024] 1. By setting up a guide component in conjunction with the adjusting cylinder, rubber sealing ring, and sealing ring groove, it is convenient to loosen the locking nut to release the fixed connection between the adjusting screw and the adjusting chamber. Then, by rotating the adjusting screw to form a threaded connection with the pressure guide hole, one end of the adjusting cylinder is pushed into the sealing ring groove, and the adjusting spring is squeezed to push the transmission plate to contact one end of the through pipe. This causes the adjusting spring to contract and deform, and at the same time, one end of the adjusting cylinder squeezes the rubber sealing ring to deform and fill the inside of the sealing ring groove. This effectively improves the sealing performance between the adjusting screw and the valve block and enhances the safety of the device.

[0025] 2. When the oil passes through the hollow valve core via pressure guide holes one and two, the oil pressure pushes the hollow valve core along the length of the buffer guide cylinder, causing the follower spring to contract and deform. At the same time, the hollow valve core drives the buffer slider to slide along the inside of the buffer groove, causing the buffer slider to compress the damping rubber strip and deform. Utilizing the elastic properties of the damping rubber strip and the buffer guide cylinder, the damping rubber strip rebounds and contacts the buffer slider. Simultaneously, the buffer guide cylinder rebounds and pushes out of the hollow valve core, increasing the resistance of the buffer slider sliding along the length of the buffer groove. This offsets part of the pressure applied to the hollow valve core by the oil, reducing the amplitude of the hollow valve core's movement along the length of the buffer guide cylinder and improving the stability of the device. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the main body of the device in this application.

[0027] Figure 2 This is a front sectional view of the main body of the device in this application.

[0028] Figure 3 This is an exploded view of the internal structure of the regulating chamber in this application.

[0029] Figure 4 This is an exploded view of the internal structure of the valve core chamber in this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Valve block; 2. Adjusting chamber; 3. Valve core chamber; 4. Guide cylinder; 5. Sealing ring groove; 6. Rubber sealing ring; 7. Adjusting cylinder; 8. Adjusting spring; 9. Transmission plate; 10. Through pipe; 11. Hollow valve core; 12. Pressure guide hole one; 13. Pressure guide hole two; 14. Adjusting screw; 15. Locking nut; 16. Guide slide groove; 17. Guide slider; 18. Limiting ring; 19. Buffer guide cylinder; 20. Buffer slot; 21. Follower spring; 22. Buffer slider; 23. Buffer slide groove; 24. Damping rubber strip; 25. Flow guide hole; 26. T-shaped fixing screw; 27. Sealing rubber gasket. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0033] This application discloses a counterbalance valve for a hydraulic lifting platform.

[0034] Reference Figures 1-3 A counterbalancing valve for a hydraulic lifting platform includes a valve block 1, an adjusting chamber 2 and a valve core chamber 3 inside the valve block 1, the adjusting chamber 2 being installed above the valve core chamber 3, a guide cylinder 4 being fixedly connected inside the adjusting chamber 2, a sealing ring groove 5 being formed between the adjusting chamber 2 and the guide cylinder 4, a pair of rubber sealing rings 6 being fixedly connected to the inner wall of the sealing ring groove 5, an adjusting cylinder 7 being inserted inside the sealing ring groove 5, an adjusting spring 8 being fixedly connected inside the adjusting cylinder 7, a transmission plate 9 being fixedly connected to the bottom of the adjusting spring 8, and the transmission plate 9 being slidably connected inside the guide cylinder 4. The bottom of the 4 is fixedly connected to the through pipe 10 which communicates with the inside of the valve core chamber 3. A hollow valve core 11 is slidably sleeved at one end of the through pipe 10. The hollow valve core 11 is installed inside the valve core chamber 3. A pressure guiding hole 12 is symmetrically opened at one end of the hollow valve core 11. A pressure guiding hole 13 that matches the pressure guiding hole 12 is symmetrically opened on the inner side of the valve core chamber 3. An adjusting screw 14 is rotatably connected to the top of the adjusting cylinder 7. One end of the adjusting screw 14 is threadedly connected to the valve block 1 and passes through the valve block 1. A locking nut 15 is threadedly connected to the end of the adjusting screw 14 that passes through the valve block 1. A guide component is installed inside the adjusting chamber 2.

[0035] The guiding component includes guide grooves 16 symmetrically formed on the inner wall of the regulating chamber 2, and guide sliders 17 symmetrically fixedly connected to one end of the regulating cylinder 7. The guide sliders 17 are slidably connected inside the guide grooves 16.

[0036] In use, first loosen the locking nut 15 to release the fixed connection between the adjusting screw 14 and the adjusting chamber 2, and rotate the adjusting screw 14 to form a threaded connection with the pressure guide hole 12. This drives the adjusting screw 14 to push the adjusting cylinder 7 to move the guide slider 17 along the length of the guide groove 16. At the same time, the adjusting cylinder 7 compresses the adjusting spring 8 along the length of the guide cylinder 4 to produce a contraction deformation. This causes the adjusting spring 8 to push the transmission plate 9 to abut against one end of the through pipe 10 along the length of the guide cylinder 4, thereby adjusting the preload of the adjusting spring 8.

[0037] When the adjusting screw 14 drives the adjusting cylinder 7 to move along the length of the guide groove 16, one end of the adjusting cylinder 7 is inserted into the sealing ring groove 5 and comes into contact with the rubber sealing ring 6, thereby squeezing the rubber sealing ring 6 to deform. At the same time, the rubber sealing ring 6 rebounds and fills the space between the sealing ring groove 5 and the adjusting cylinder 7, thereby improving the sealing performance between the adjusting cylinder 7 and the sealing ring groove 5. Then, the locking nut 15 is tightened along the length of the adjusting screw 14 to form a fixed contact with the valve block 1, thereby effectively improving the sealing performance between the adjusting screw 14 and the valve block 1 and improving the safety of the device.

[0038] Reference Figure 2 and Figure 3 A limiting ring 18 is fixedly connected to the inner top of the guide cylinder 4, and the limiting ring 18 abuts against one end of the transmission plate 9.

[0039] When in use, if the oil pressure entering the hollow valve core 11 through the pressure guide hole 12 and the pressure guide hole 13 is too high, the oil inside the hollow valve core 11 will push the transmission plate 9 to move upward along the length of the pipe 10 and squeeze the adjusting spring 8 to produce a contraction deformation. At the same time, the transmission plate 9 will come into contact with the limiting ring 18 along the length of the pipe 10, thereby effectively reducing the possibility of the transmission plate 9 detaching from the guide cylinder 4 and improving the practicality of the device.

[0040] Reference Figures 2-4 A buffer guide cylinder 19 is fixedly connected to the bottom of the valve core chamber 3. A buffer slot 20 adapted to the buffer guide cylinder 19 is opened at the bottom of the hollow valve core 11. A follower spring 21 is fixedly connected inside the buffer guide cylinder 19. One end of the follower spring 21 is fixedly connected to the hollow valve core 11.

[0041] The buffer slot 20 is symmetrically fixedly connected to the inner side of the buffer slider 22, and the buffer guide cylinder 19 is symmetrically provided with buffer grooves 23 that are adapted to the buffer slider 22. The inner side of the buffer groove 23 is symmetrically fixedly connected to the damping rubber strips 24, and the buffer slider 22 is inserted between the two damping rubber strips 24.

[0042] In use, when the oil passes through the pressure guide hole 12 and pressure guide hole 13 into the hollow valve core 11, the oil pressure pushes the hollow valve core 11 along the length of the buffer guide cylinder 19 to compress the follower spring 21, causing it to contract and deform. At the same time, the hollow valve core 11 drives the buffer slider 22 to slide along the inside of the buffer groove 23, and the buffer slider 22 compresses the damping rubber strip 24 to deform. Utilizing the elastic properties of the damping rubber strip 24, the damping rubber strip 24 rebounds and contacts the buffer slider 22, thereby increasing the resistance of the buffer slider 22 sliding along the length of the buffer groove 23. This offsets part of the pressure applied to the hollow valve core 11 by the oil, thereby reducing the amplitude of the hollow valve core 11's movement along the length of the buffer guide cylinder 19 and improving the stability of the device.

[0043] Reference Figures 2-4 The bottom of the pipe 10 is set as a conical structure and has multiple guide holes 25 evenly opened, and the multiple guide holes 25 are arranged in a circle.

[0044] When in use, when the oil passes through the pressure guide hole 12 and pressure guide hole 13 through the hollow valve core 11, the oil flows along the tapered surface at the bottom of the pipe 10 and passes through the guide hole 25 into the inside of the pipe 10 to form contact with the transmission plate 9. This effectively reduces the resistance of the bottom of the pipe 10 to the oil and improves the smoothness of the oil passing through the inside of the pipe 10.

[0045] Reference Figures 2-4 One end of the valve block 1 is fixedly connected to a T-shaped fixing screw 26, and a sealing rubber gasket 27 is fitted onto one end of the T-shaped fixing screw 26.

[0046] When in use, when the hollow valve core 11 is rotated and connected to the valve seat by the T-shaped fixing screw 26, the T-shaped fixing screw 26 causes the sealing rubber gasket 27 to come into contact with one end of the valve seat, and the sealing rubber gasket 27 is deformed under force, thereby filling the space between the T-shaped fixing screw 26 and the valve seat, further improving the sealing performance of the device.

[0047] Reference Figure 1 and Figure 2 The surface of valve block 1 is coated with an epoxy resin coating.

[0048] During use, by coating the surface of valve block 1 with epoxy resin, an anti-corrosion protective layer is formed on the surface of valve block 1, which effectively improves the corrosion resistance of valve block 1 and extends the service life of the device.

[0049] The implementation principle of the anti-balance valve for a hydraulic lifting platform in this embodiment is as follows: First, by loosening the locking nut 15, the fixed connection between the adjusting screw 14 and the adjusting chamber 2 is released, and the adjusting screw 14 is rotated to form a threaded connection with the pressure guide hole 12, thereby driving the adjusting screw 14 to push the adjusting cylinder 7 to drive the guide slider 17 to move along the length direction of the guide groove 16. At the same time, the adjusting cylinder 7 compresses the adjusting spring 8 along the length direction of the guide cylinder 4 to produce a contraction deformation, and the adjusting spring 8 pushes the transmission plate 9 to form an abutment with one end of the through pipe 10 along the length direction of the guide cylinder 4, so as to adjust the preload of the adjusting spring 8.

[0050] When the adjusting screw 14 drives the adjusting cylinder 7 to move along the length of the guide groove 16, one end of the adjusting cylinder 7 is inserted into the interior of the sealing ring groove 5 and comes into contact with the rubber sealing ring 6, thereby squeezing the rubber sealing ring 6 to deform. At the same time, the rubber sealing ring 6 rebounds and fills the space between the sealing ring groove 5 and the adjusting cylinder 7 to improve the sealing between the adjusting cylinder 7 and the sealing ring groove 5. Then, the locking nut 15 is tightened along the length of the adjusting screw 14 to form a fixed contact with the valve block 1.

[0051] Then, when the oil passes through the pressure guide hole 12 and pressure guide hole 13 into the hollow valve core 11, the oil pressure pushes the hollow valve core 11 along the length of the buffer guide cylinder 19 to compress the follower spring 21 and cause it to contract and deform. At the same time, the hollow valve core 11 drives the buffer slider 22 to slide along the inside of the buffer groove 23, and the buffer slider 22 compresses the damping rubber strip 24 to deform. Utilizing the elastic characteristics of the damping rubber strip 24 and the buffer guide cylinder 19, the damping rubber strip 24 rebounds and contacts the buffer slider 22. At the same time, the buffer guide cylinder 19 rebounds and pushes out of the hollow valve core 11, thereby increasing the resistance of the buffer slider 22 sliding along the length of the buffer groove 23, thus offsetting part of the pressure applied to the hollow valve core 11 by the oil, and reducing the amplitude of the hollow valve core 11 moving along the length of the buffer guide cylinder 19.

Claims

1. A counterbalancing valve for a hydraulic lifting platform, comprising a valve block (1), characterized in that: The valve block (1) has an adjustment chamber (2) inside, and a valve core chamber (3) is also provided inside the valve block (1). The adjustment chamber (2) is installed above the valve core chamber (3). A guide cylinder (4) is fixedly connected inside the adjustment chamber (2). A sealing ring groove (5) is formed between the adjustment chamber (2) and the guide cylinder (4). A pair of rubber sealing rings (6) are fixedly connected to the inner wall of the sealing ring groove (5). An adjustment cylinder (7) is inserted inside the sealing ring groove (5). An adjustment spring (8) is fixedly connected inside the adjustment cylinder (7). A transmission plate (9) is fixedly connected to the bottom of the adjustment spring (8). The transmission plate (9) is slidably connected inside the guide cylinder (4). The bottom of the guide cylinder (4) A pipe (10) is fixedly connected to the inside of the valve core chamber (3). A hollow valve core (11) is slidably sleeved at one end of the pipe (10). The hollow valve core (11) is installed inside the valve core chamber (3). A pressure guide hole (12) is symmetrically opened at one end of the hollow valve core (11). A pressure guide hole (13) adapted to the pressure guide hole (12) is symmetrically opened on the inner side of the valve core chamber (3). An adjusting screw (14) is rotatably connected to the top of the adjusting cylinder (7). One end of the adjusting screw (14) is threadedly connected to the valve block (1) and passes through the valve block (1). A locking nut (15) is threadedly connected to one end of the adjusting screw (14) that passes through the valve block (1). A guide assembly is installed inside the adjusting chamber (2).

2. The counterbalancing valve for a hydraulic lifting platform according to claim 1, characterized in that: The guiding component includes guide grooves (16) symmetrically opened on the inner wall of the regulating chamber (2), and guide sliders (17) are symmetrically fixedly connected to one end of the regulating cylinder (7), and the guide sliders (17) are slidably connected inside the guide grooves (16).

3. The counterbalancing valve for a hydraulic lifting platform according to claim 1, characterized in that: A limiting ring (18) is fixedly connected to the inner top of the guide tube (4), and the limiting ring (18) abuts against one end of the transmission plate (9).

4. The counterbalancing valve for a hydraulic lifting platform according to claim 1, characterized in that: The bottom of the valve core chamber (3) is fixedly connected to a buffer guide cylinder (19). The bottom of the hollow valve core (11) is provided with a buffer slot (20) that is compatible with the buffer guide cylinder (19). The inside of the buffer guide cylinder (19) is fixedly connected to a follower spring (21). One end of the follower spring (21) is fixedly connected to the hollow valve core (11).

5. The counterbalancing valve for a hydraulic lifting platform according to claim 4, characterized in that: The buffer slot (20) is symmetrically fixedly connected to the inner side of the buffer slider (22), and the buffer guide cylinder (19) is symmetrically provided with a buffer groove (23) adapted to the buffer slider (22). The buffer groove (23) is symmetrically fixedly connected to the inner side of the buffer groove (23), and the buffer slider (22) is inserted between the two damping rubber strips (24).

6. The counterbalancing valve for a hydraulic lifting platform according to claim 1, characterized in that: The bottom of the tube (10) is set as a conical structure and a plurality of guide holes (25) are evenly opened, and the plurality of guide holes (25) are arranged in a circular pattern.

7. The counterbalancing valve for a hydraulic lifting platform according to claim 1, characterized in that: One end of the valve block (1) is fixedly connected to a T-shaped fixing screw (26), and a sealing rubber gasket (27) is fitted on one end of the T-shaped fixing screw (26).

8. The counterbalancing valve for a hydraulic lifting platform according to claim 1, characterized in that: The surface of the valve block (1) is coated with an epoxy resin coating.

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