Integrated valve assembly integrating high plunger and low plunger of airplane wheel jack

Abstract

The utility model discloses an airplane wheel jack high and low plunger integrated pile-up valve assembly, which relates to the technical field of airplane wheel jacks, and comprises a valve body and an oil tank, a shaft rod penetrates through the top of the valve body, and the top of the shaft rod is connected with a rocking seat; a sleeve is fixed to one side of the rocking seat, an ejector block is connected into the sleeve through a spring, guide rods penetrate through the outer surface and the back of the ejector block, and guide grooves are formed in the outer surface and the back of the sleeve. The comprehensive integrated valve assembly integrating the high plunger and the low plunger is a valve body assembly integrating the high plunger hand pump, the low plunger hand pump, the one-way valve, the overflow valve, the throttling valve and the reversing valve, and in order to meet the requirements of the high plunger hand pump and the low plunger hand pump, the high plunger, the low plunger and the one-way valve are connected in series for use; the use space of the valve body is reduced, the use space of the jack and the oil tank is increased, the valve body assembly and the oil tank are overlapped, meanwhile, the boundary dimension of the jack is reduced, and the requirement for use of the airplane wheel jack in a narrow space can be better met.

Description

Technical Field

[0001] This utility model relates to the field of aircraft wheel jack technology, specifically to an integrated valve assembly that integrates high and low plungers for aircraft wheel jacks. Background Technology

[0002] Aircraft wheel jacks are essential tools in aircraft maintenance, primarily used for replacing the nose wheel and main wheels, serving to lift and support the wheel axles. They consist of a multi-section jack, frame, leaf springs, rear wheel, high-pressure pump, low-pressure pump, fuel tank, and two swivel wheels, and are characterized by their ease of use, convenience, labor-saving features, and high efficiency.

[0003] Machine wheel jacks are lightweight and easy to use in confined spaces. However, compared to machine wheel jacks, they have higher requirements for each component, such as the valve body assembly. Existing valve bodies have some shortcomings for machine wheel jacks: First, the hand pump plunger in existing valve bodies is mainly a single plunger, double high-pressure plunger, or one high-pressure plunger and one low-pressure plunger. Second, the pairing of plungers and check valves is mostly in parallel. Third, the hand pump, check valve, stop valve, and directional valve body and directional valve on the valve body are all installed separately. All of these points have certain limitations and localization on the design scope and application space of machine wheel jacks. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide an integrated valve assembly that combines high and low plungers in a wheel jack, so as to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an integrated valve assembly for a high and low plunger in a wheel jack, comprising a valve body and an oil tank. A shaft passes through the top of the valve body, and a rocker seat is connected to the top of the shaft. A sleeve is fixed to one side of the rocker seat, and a top block is connected inside the sleeve via a spring. Guide rods pass through the outer surface and back of the top block. Guide grooves are formed on the outer surface and back of the sleeve. Slots are formed at the top and bottom of the sleeve. A handle passes through one end of the sleeve, and a locking block is fixed to the outer surface and back of the handle. First plungers are connected to both sides of the bottom of the rocker seat via connecting rods, and second plungers are connected to the bottom of both first plungers. One-way throttle valves and two... The valve body has a plunger sleeve and a directional valve installed on top of the one-way throttle valve. A low-pressure oil inlet is provided on one side of each plunger sleeve, and a secondary low-pressure oil outlet and a secondary high-pressure oil outlet are provided on the other side of each plunger sleeve. A plunger support block is connected to the bottom of each plunger sleeve, and a high-pressure one-way valve is installed inside each plunger support block. A low-pressure one-way valve is connected to the bottom of each plunger support block via an intermediate joint, and a suction pipe is connected to the bottom of each low-pressure one-way valve. A main high-pressure oil outlet and a main low-pressure oil outlet are respectively provided in the middle of the valve body. An isolation one-way valve is installed inside the valve body, and an overflow valve is installed on one side of the valve body. Return oil pipes are connected to both sides of the bottom of the valve body. A power reduction valve is installed on one side of the valve body.

[0006] By adopting the above technical solution, during use, the operator repeatedly swings the handle up and down to start continuous oil supply, causing the rocker arm to swing back and forth on the shaft. The rocker arm acts like a lever; when the right side of the rocker arm drives the first and second plungers on the right to move upward via a connecting rod, the corresponding left side of the rocker arm drives the first and second plungers on the left to move downward via a connecting rod. When the first and second plungers are working, the outer diameter of the first plunger is larger than that of the second plunger, and the first and second plungers cooperate with the plunger sleeve. The first plunger acts as a low-pressure hand pump, while the second plunger acts as a high-pressure hand pump, achieving the effect of parallel operation of the low-pressure and high-pressure hand pumps, forming a high-low pressure plunger hand pump. The plunger support block contains... The unit is equipped with oil passages and oil holes, which facilitates the separation of the oil circuits for the high-pressure and low-pressure hand-cranked pumps. Therefore, when the first and second plungers rise, they draw oil from the oil tank through the suction pipe. The low-pressure oil from the first plunger flows from the suction pipe through the oil hole inside the plunger support block, along the low-pressure oil delivery hole, to the upper part of the plunger sleeve. A high-pressure check valve prevents high-pressure and low-pressure oil from flowing in series when the second and first plungers are connected. The high-pressure oil from the second plunger flows from the suction pipe through the high-pressure check valve inside the plunger support block to the lower part of the plunger sleeve. When the first and second plungers descend, they supply oil to the jack. The low-pressure and high-pressure check valves prevent hydraulic oil from flowing back into the oil tank, and they are on the same axis, allowing the two check valves to flow in series. This design increases the jack's design space. Two streams of high-pressure oil flow from the secondary high-pressure outlet through the internal oil passage of the valve body to the main high-pressure outlet, while two streams of low-pressure oil flow from the secondary low-pressure outlet through the internal oil passage of the valve body to the main low-pressure outlet. When the left-side pressure reduction valve does not reach the set pressure value, the high-pressure oil flowing from the main high-pressure outlet does no work. At this time, the low-pressure oil flows from the main low-pressure outlet and presses down on the isolation check valve. Then, the low-pressure oil, along with the high-pressure oil, enters the P port of the throttle valve at the main high-pressure outlet, controlling the jack's rise or fall according to the direction of the directional valve. When the left-side pressure reduction valve reaches the set pressure value, the high-pressure oil flowing from the main high-pressure outlet does work, pushing upwards against the isolation check valve, allowing the low-pressure oil to flow from the main low-pressure outlet... After the oil flows out of the outlet, it does not press down to disconnect the check valve. Instead, it pushes the internal valve core of the power reduction valve, allowing low-pressure oil to flow from the internal oil passage of the valve body through the oil passage hole of the power reduction valve and into the oil tank through the return oil pipe. Then, high-pressure oil enters the P port of the throttle valve, controlling the jack's rise or fall according to the direction of the reversing valve. When the jack rises, the check throttle valve closes, and the reversing valve switches to the rising state. When the jack falls, the check throttle valve opens, and the reversing valve switches to the falling state. The hydraulic system automatically switches from the low-pressure hand pump to the high-pressure hand pump, reducing the user's fatigue during operation. When the right-side relief valve reaches the set pressure value, high-pressure oil flows from the internal oil passage of the valve body through the oil passage hole of the relief valve and into the oil tank through the return oil pipe.

[0007] Furthermore, the oil suction pipe is connected to the oil tank, and the valve body is installed on the top of the oil tank.

[0008] By adopting the above technical solution, when the first plunger and the second plunger rise, they draw oil from the oil tank through the oil suction pipe. The low-pressure oil of the first plunger flows from the oil suction pipe through the oil hole inside the plunger support block, along the low-pressure oil delivery hole, to the upper part of the plunger sleeve. The high-pressure check valve prevents the high-pressure oil and low-pressure oil from being connected in series when the second plunger and the first plunger are inlet. The high-pressure oil of the second plunger flows from the oil suction pipe through the high-pressure check valve inside the plunger support block to the lower part of the plunger sleeve.

[0009] Furthermore, the diameter of the first plunger is larger than the diameter of the second plunger, and the inner diameter of the top of the plunger sleeve is larger than the inner diameter of the bottom of the plunger sleeve. The first plunger is slidably connected to the upper interior of the plunger sleeve, and the second plunger is slidably connected to the lower interior of the plunger sleeve.

[0010] By adopting the above technical solution, the outer diameter of the first plunger is larger than that of the second plunger, and the first plunger and the second plunger cooperate with the plunger sleeve. The first plunger acts as a low-pressure hand pump, while the second plunger acts as a high-pressure hand pump, achieving the effect of parallel connection of the low-pressure hand pump and the high-pressure hand pump, forming a high-low pressure plunger hand pump.

[0011] Furthermore, the two ends of the connecting rod are rotatably connected to the first plunger and the rocker seat, respectively, and the rocker seat is rotatably connected to the shaft.

[0012] By adopting the above technical solution, when in use, the operator swings the handle up and down to start continuous oil supply operation, so that the rocker arm is subjected to force and swings up and down on the shaft. The rocker arm acts like a lever. When the right side of the rocker arm drives the first and second plungers on the right side to move up through the connecting rod, the corresponding left side of the rocker arm drives the first and second plungers on the left side to move down through the connecting rod.

[0013] Furthermore, the handle is detachably connected to the sleeve, and the locking block is slidably connected to the locking groove.

[0014] By adopting the above technical solution, when disassembling the handle, the worker presses the handle towards the sleeve to displace the handle, and then the worker rotates the handle in the opposite direction and pulls the handle outward, thus completing the disassembly operation of the handle.

[0015] Furthermore, the longitudinal section of the card slot is arc-shaped, and the cross-section of the card slot is "J"-shaped.

[0016] By adopting the above technical solution, the handle is inserted into the sleeve. When the handle can no longer be inserted into the sleeve, the operator rotates the handle to make the locking block move along the arc path. When the handle can no longer be rotated, the operator can pull the handle outward and push the top block with the spring to move the handle. After the handle is moved, the locking block abuts against the slot, so that the handle cannot be rotated or pulled outward.

[0017] Furthermore, the top block is fitted into the handle, and the top block is slidably connected to the guide groove via a guide rod.

[0018] By adopting the above technical solution, the handle is inserted into the sleeve, and the push block is embedded in the end of the handle and pushed by the handle to compress the spring. The push block is limited by the guide rod and guide groove to prevent the spring from being damaged by torsional force when the handle is rotated.

[0019] Furthermore, the guide rod is composed of bolts and nuts, and the guide rod is detachably connected to the top block and the guide groove.

[0020] By adopting the above technical solution, when the top block needs to be replaced due to wear, since the guide rod is composed of bolts and nuts, the worn top block can be taken out of the sleeve simply by loosening and removing the guide rod. Then, the new top block is placed into the sleeve, and the top block replacement operation is completed after the guide rod is installed.

[0021] Furthermore, a transition groove is provided on one side of the card slot, and a positioning groove is provided on the other side of the transition groove. The top block is detachably connected to the sleeve through the positioning groove and the card slot.

[0022] By adopting the above technical solution, when the top block continues to move into the sleeve, the transition groove guides the protrusions at the top and bottom of the top block into the positioning groove. Then, the positioning groove guides the top block to prevent it from rotating, so that the holes on the outer surface of the top block for installing the guide rod are aligned with the guide groove, thereby facilitating the installation of the guide rod.

[0023] In summary, the present invention has the following main advantages:

[0024] 1. This utility model designs a comprehensive integrated valve assembly that combines high and low plungers, integrating a high and low plunger hand pump, a check valve, an overflow valve, a throttle valve, and a directional valve into one valve body assembly. To meet the requirements of the high and low plunger hand pump, the high and low plungers and the check valve are used in series. This reduces the usable space of the valve body and increases the usable space of the jack and oil tank. The valve body assembly and the oil tank are stacked together, which also reduces the external size of the jack and better meets the requirements of the wheel jack in a confined space.

[0025] 2. This utility model features a quick-release and reassembly structure for the handle. The handle can be disassembled and installed with a simple push, turn, and pull. Unlike traditional jack handles, which require the operator to press the spring pin by hand, this design avoids the situation where the small contact area of ​​the spring pin results in high spring pressure, causing pain to the operator's fingers. It also prevents the operator's fingers from being squeezed and injured by the gap between the spring pin and the slot. This design facilitates operation and improves safety. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of the plunger sleeve of this utility model;

[0028] Figure 3 This is a schematic diagram of the cross-sectional structure of the valve body of this utility model;

[0029] Figure 4 This is a schematic diagram of the oil circuit of this utility model;

[0030] Figure 5 This is a schematic diagram of the cross-sectional structure of the sleeve of this utility model;

[0031] Figure 6 This is a schematic diagram of the sleeve explosion structure of this utility model.

[0032] In the diagram: 1. Valve body; 2. Power reduction valve; 3. Plunger sleeve; 4. First plunger; 5. Second plunger; 6. Connecting rod; 7. Shaft; 8. Rocker seat; 9. Directional valve; 10. One-way throttle valve; 11. Secondary low-pressure oil outlet; 12. High-pressure one-way valve; 13. Plunger support block; 14. Intermediate joint; 15. Low-pressure one-way valve; 16. Suction pipe; 17. Secondary high-pressure oil outlet; 18. Low-pressure oil supply port; 19. Main high-pressure oil outlet; 20. Main low-pressure oil outlet; 21. Relief valve; 22. Isolation one-way valve; 23. Return pipe; 24. Oil tank; 25. Sleeve; 26. Handle; 27. Locking block; 28. Locking groove; 29. ​​Top block; 30. Guide rod; 31. Spring; 32. Guide groove; 33. Transition groove; 34. Positioning groove. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] The embodiments of this utility model will be described below based on its overall structure.

[0035] Example 1:

[0036] An integrated valve assembly that combines a high-low plunger in a wheel jack, such as... Figures 1-4As shown, the system includes a valve body 1 and an oil tank 24. The valve body 1 is mounted on the top of the oil tank 24. A shaft 7 passes through the top of the valve body 1, and a rocker seat 8 is connected to the top of the shaft 7. The rocker seat 8 is rotatably connected to the shaft 7. First plungers 4 are connected to both sides of the bottom of the rocker seat 8 via connecting rods 6. The two ends of the connecting rods 6 are rotatably connected to the first plungers 4 and the rocker seat 8, respectively. Second plungers 5 are connected to the bottom of each of the two first plungers 4. The diameter of the first plunger 4 is larger than the diameter of the second plunger 5. One-way throttle valves 10 and two plunger sleeves 3 are provided on both sides of the top of the valve body 1. The inner diameter of the top of the plunger sleeve 3 is larger than the inner diameter of the bottom of the plunger sleeve 3. The first plunger 4 is slidably connected to the upper interior of the plunger sleeve 3. The two plungers 5 are slidably connected to the lower part of the plunger sleeve 3. The operator repeatedly swings the handle 26 up and down to start continuous oil supply, causing the rocker arm 8 to swing back and forth on the shaft 7. The rocker arm 8 acts like a lever; when the right side of the rocker arm 8 drives the first plunger 4 and the second plunger 5 to move upwards via the connecting rod 6, the corresponding left side of the rocker arm 8 drives the first plunger 4 and the second plunger 5 to move downwards via the connecting rod 6. When the first plunger 4 and the second plunger 5 are working, the outer diameter of the first plunger 4 is larger than that of the second plunger 5, and the first plunger 4 and the second plunger 5 cooperate with the plunger sleeve 3. The first plunger 4 acts as a low-pressure hand pump, while the second plunger 5 acts as a high-pressure pump. The hand-cranked pump achieves the effect of parallel operation of a low-pressure hand-cranked pump and a high-pressure hand-cranked pump, forming a high-low pressure plunger hand-cranked pump. A reversing valve 9 is installed on the top of the one-way throttle valve 10. When the jack rises, the one-way throttle valve 10 closes, and the reversing valve 9 switches to the rising state. When the jack descends, the one-way throttle valve 10 opens, and the reversing valve 9 switches to the descending state. A low-pressure oil inlet 18 is opened on one side of each of the two plunger sleeves 3, and a secondary low-pressure oil outlet 11 and a secondary high-pressure oil outlet 17 are opened on the other side of each of the two plunger sleeves 3. A plunger support block 13 is connected to the bottom of each of the two plunger support blocks 13, and a high-pressure one-way valve 12 is installed inside each of the two plunger support blocks 13. The bottom of each block 13 is connected to a low-pressure check valve 15 via an intermediate joint 14. The bottom of each low-pressure check valve 15 is connected to an oil suction pipe 16, which is connected to the oil tank 24. When the first plunger 4 and the second plunger 5 rise, they draw oil from the oil tank 24 through the oil suction pipe 16. The low-pressure oil of the first plunger 4 flows from the oil suction pipe 16 through the oil hole inside the plunger support block 13, along the low-pressure oil delivery hole 18, to the upper part of the plunger sleeve 3. The high-pressure check valve 12 prevents the high-pressure oil from being connected in series with the low-pressure oil when the second plunger 5 and the first plunger 4 are inlet. The high-pressure oil of the second plunger 5 flows from the oil suction pipe 16 through the high-pressure check valve 12 inside the plunger support block 13 to the lower part of the plunger sleeve 3.The valve body 1 has a main high-pressure oil outlet 19 and a main low-pressure oil outlet 20 respectively. A disconnect check valve 22 is installed inside the valve body 1, and a relief valve 21 is installed on one side of the valve body 1. Return oil pipes 23 are connected to both sides of the bottom of the valve body 1. When the left-side power reduction valve 2 does not reach the set pressure value, the high-pressure oil flowing from the main high-pressure oil outlet 19 does no work. At this time, low-pressure oil flows out from the main low-pressure oil outlet 20 and presses down on the disconnect check valve 22. Then, the low-pressure oil enters the P port of the throttle valve together with the high-pressure oil in the main high-pressure oil outlet 19, controlling the rise or fall of the jack according to the direction of the reversing valve 9. When the left-side power reduction valve 2 reaches the set pressure value, the high-pressure oil flowing from the main high-pressure oil outlet 19 does work, pushing upwards against the disconnect check valve 22, causing low-pressure oil to flow out from the main low-pressure oil outlet. After oil flows out, it cannot press down to disconnect the one-way valve 22. Instead, it pushes the internal valve core of the power reduction valve 2, allowing low-pressure oil to flow from the internal oil passage of the valve body 1 through the oil passage hole of the power reduction valve 2, and into the oil tank 24 through the return oil pipe 23. Then, high-pressure oil enters the P port of the throttle valve, controlling the jack's rise or fall according to the direction of the reversing valve 9. When the jack rises, the one-way throttle valve 10 closes, and the reversing valve 9 switches to the rising state; when the jack falls, the one-way throttle valve 10 opens, and the reversing valve 9 switches to the falling state. The hydraulic system automatically switches from the low-pressure hand pump to the high-pressure hand pump, reducing user fatigue. When the right-side relief valve 21 reaches the set pressure value, high-pressure oil flows from the internal oil passage of the valve body 1 through the oil passage hole of the relief valve 21, and into the oil tank 24 through the return oil pipe 23.

[0037] See Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6In the above embodiment, a sleeve 25 is fixed to one side of the rocker seat 8. A top block 29 is connected inside the sleeve 25 via a spring 31. The top block 29 is fitted into the handle 26. A guide rod 30 passes through the outer surface and back of the top block 29. Guide grooves 32 are provided on both the outer surface and back of the sleeve 25. The top block 29 is slidably connected to the guide grooves 32 via the guide rods 30. A retaining groove 28 is provided at both the top and bottom of the sleeve 25. The longitudinal section of the retaining groove 28 is arc-shaped, and the cross-section of the retaining groove 28 is "J"-shaped. A handle 26 extends through one end of the sleeve 25. The handle 26 is detachably connected to the sleeve 25. A locking block 27 is fixed to both the outer surface and back of the handle 26. The locking block 27 is slidably connected to the slot 28. When installing the handle 26, the operator aligns the locking block 27 with the slot 28 at the entrance of the sleeve 25 end face and inserts the handle 26 into the sleeve 25. The push block 29 then embeds into the end of the handle 26 and is pushed by the handle 26, compressing the spring 31. When the handle 26 can no longer enter the sleeve 25, the operator rotates the handle. 26. The locking block 27 is moved along the arc path. When the handle 26 can no longer rotate, the operator can pull the handle 26 outward and, in conjunction with the spring 31, push the top block 29 to move the handle 26. After the handle 26 is moved, the locking block 27 abuts against the slot 28, preventing the handle 26 from rotating or being pulled outward, thus completing the installation operation of the handle 26. Furthermore, when the operator is not holding the handle 26, the spring 31 supports the handle 26 through the top block 29, preventing the handle 26 from sliding into the sleeve 25 due to gravity. When disassembling handle 26, the worker presses handle 26 towards sleeve 25 to displace handle 26. Then, the worker rotates handle 26 in the opposite direction and pulls handle 26 outward. This completes the disassembly of handle 26. It is simple and convenient. The guide rod 30 and guide groove 32 work together to limit the top block 29. First, it prevents the top block 29 from being pushed out of sleeve 25 by spring 31. Second, it prevents the top block 29 from rotating when handle 26 rotates, which would cause spring 31 to be torsion and damaged.

[0038] Example 2:

[0039] Based on the above embodiment 1, the following settings are made to facilitate the replacement of the worn top block 29.

[0040] See Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6In the above embodiment, the guide rod 30 is composed of bolts and nuts. The guide rod 30 is detachably connected to the top block 29 and the guide groove 32. A transition groove 33 is provided on one side of the slot 28, and a positioning groove 34 is provided on one side of the transition groove 33. The top block 29 is detachably connected to the sleeve 25 through the positioning groove 34 and the slot 28. When the top block 29 is worn and needs to be replaced, since the guide rod 30 is composed of bolts and nuts, the worn top block 29 can be removed from the sleeve 25 simply by loosening the guide rod 30. Then, a new top block 29 is placed into the sleeve 25. At this time, the guide rod 29 is removed through the slot 28. The top block 29 is guided by the handle 26. Then, the top block 29 can be pressed against the sleeve 25 by the handle 26, so that the sleeve 25 overcomes the elasticity of the spring 31 and goes deep into the sleeve 25. Then, as the top block 29 continues to move into the sleeve 25, the transition groove 33 guides the protrusions at the top and bottom of the top block 29 into the positioning groove 34. Then, the positioning groove 34 guides the top block 29 to prevent the top block 29 from rotating, so that the hole on the outer surface of the top block 29 for installing the guide rod 30 is aligned with the guide groove 32, thereby facilitating the installation of the guide rod 30. After the guide rod 30 is installed, the replacement operation of the top block 29 is completed.

[0041] The implementation principle of this utility model is as follows: First, when installing the handle 26, the worker aligns the locking block 27 with the slot 28 at the entrance of the sleeve 25 end face and inserts the handle 26 into the sleeve 25. The push block 29 is embedded in the end of the handle 26 and is pushed by the handle 26 to compress the spring 31. When the handle 26 can no longer enter the sleeve 25, the worker rotates the handle 26, causing the locking block 27 to move along an arc path. When the handle 26 can no longer rotate, the worker can pull the handle 26 outward and cooperate with the spring 31 to push the push block 29 to move the handle 26. After the handle 26 is moved, the locking block 27 abuts against the slot 28, preventing the handle 26 from rotating and being pulled outward, thus completing the installation operation of the handle 26. When the worker is not holding the handle 26, the spring 31 supports the handle 26 through the push block 29, preventing the handle 26 from sliding into the sleeve 25 due to gravity.

[0042] During use, the operator repeatedly swings handle 26 up and down to initiate continuous oil supply, causing the rocker arm 8 to swing back and forth on shaft 7. The rocker arm 8 acts like a lever; when the right side of the rocker arm 8 drives the first plunger 4 and second plunger 5 upwards via connecting rod 6, the corresponding left side of the rocker arm 8 drives the first plunger 4 and second plunger 5 downwards via connecting rod 6. Figure 2 and Figure 3 As shown;

[0043] When the first plunger 4 and the second plunger 5 are working, such as Figure 2 and Figure 3As shown, the outer diameter of the first plunger 4 is larger than that of the second plunger 5, and the first plunger 4 and the second plunger 5 cooperate with the plunger sleeve 3. The first plunger 4 acts as a low-pressure hand pump, while the second plunger 5 acts as a high-pressure hand pump, achieving the effect of parallel connection of the low-pressure hand pump and the high-pressure hand pump, forming a high-low pressure plunger hand pump.

[0044] The plunger support block 13 has internal oil passages and oil holes, which facilitates the separation of the oil circuits for the high-pressure and low-pressure hand-cranked pumps. Therefore, when the first plunger 4 and the second plunger 5 rise, they draw oil from the oil tank 24 through the suction pipe 16. The low-pressure oil from the first plunger 4 flows from the suction pipe 16 through the internal oil holes of the plunger support block 13, along the low-pressure oil delivery hole 18, to the upper part of the plunger sleeve 3. The high-pressure check valve 12 prevents high-pressure and low-pressure oil from being connected in series when the second plunger 5 and the first plunger 4 are entering the pump. Meanwhile, the high-pressure oil from the second plunger 5 flows from the suction pipe 16 through the high-pressure check valve 12 inside the plunger support block 13 to the lower part of the plunger sleeve 3. Figure 2 As shown in the diagram, the three dashed lines on the right represent the path of low-pressure oil movement, and the three dashed lines on the left represent the path of high-pressure oil movement.

[0045] When the first plunger 4 and the second plunger 5 descend, they supply oil to the jack. The low-pressure check valve 15 and the high-pressure check valve 12 prevent the hydraulic oil from flowing back to the oil tank 24. The low-pressure check valve 15 and the high-pressure check valve 12 are on the same axis, so that the two check valves are connected in series, increasing the design space of the jack. Then, the two high-pressure oils converge from the secondary high-pressure oil outlet 17 through the internal oil passage of the valve body 1 to the main high-pressure oil outlet 19, while the two low-pressure oils converge from the secondary low-pressure oil outlet 11 through the internal oil passage of the valve body 1 to the main low-pressure oil outlet 20.

[0046] When the left-side pressure reduction valve 2 does not reach the set pressure value, the high-pressure oil flowing out of the main high-pressure oil outlet 19 does no work. At this time, the low-pressure oil flows out of the main low-pressure oil outlet 20 and presses down the isolation check valve 22. Then, the low-pressure oil enters the P port of the throttle valve together with the high-pressure oil in the main high-pressure oil outlet 19, controlling the rise or fall of the jack according to the direction of the reversing valve 9. When the left-side pressure reduction valve 2 reaches the set pressure value, the high-pressure oil flowing out of the main high-pressure oil outlet 19 does work, pushing upward against the isolation check valve 22, so that the low-pressure oil flowing out of the main low-pressure oil outlet 20 cannot press down the isolation check valve 22, but instead pushes the internal valve core of the pressure reduction valve 2, allowing the low-pressure oil to flow out of the valve body 1. The internal oil passage of the hydraulic jack enters the oil tank 24 through the oil passage hole of the power reduction valve 2 and the return oil pipe 23. Then, the high-pressure oil enters the P port of the throttle valve and controls the rise or fall of the jack according to the direction of the reversing valve 9. When the jack rises, the one-way throttle valve 10 closes and the reversing valve 9 switches to the rising state. When the jack falls, the one-way throttle valve 10 opens and the reversing valve 9 switches to the falling state. The hydraulic system automatically switches from the low-pressure hand pump to the high-pressure hand pump to reduce the fatigue intensity of the user. When the right relief valve 21 reaches the set pressure value, the high-pressure oil enters the oil tank 24 from the internal oil passage of the valve body 1 through the oil passage hole of the relief valve 21 and the return oil pipe 23.

[0047] When disassembling handle 26, the worker presses handle 26 towards sleeve 25 to displace handle 26. Then, the worker rotates handle 26 in the opposite direction and pulls handle 26 outward. This completes the disassembly of handle 26. It is simple and convenient. The guide rod 30 and guide groove 32 work together to limit the top block 29. First, it prevents the top block 29 from being pushed out of sleeve 25 by spring 31. Second, it prevents the top block 29 from rotating when handle 26 rotates, which would cause spring 31 to be torsion and damaged.

[0048] When the top block 29 is worn and needs to be replaced, since the guide rod 30 is composed of bolts and nuts, the worn top block 29 can be removed from the sleeve 25 simply by loosening the guide rod 30. Then, the new top block 29 is placed into the sleeve 25. At this time, the top block 29 is guided by the slot 28. Then, the top block 29 can be pressed against the sleeve 25 by the handle 26, so that the sleeve 25 overcomes the elasticity of the spring 31 and goes deep into the sleeve 25. Then, as the top block 29 continues to move into the sleeve 25, the transition groove 33 guides the protrusions at the top and bottom of the top block 29 into the positioning groove 34. Then, the positioning groove 34 guides the top block 29 to prevent the top block 29 from rotating, so that the hole on the outer surface of the top block 29 for installing the guide rod 30 is aligned with the guide groove 32, thereby facilitating the installation of the guide rod 30. After the guide rod 30 is installed, the replacement operation of the top block 29 is completed.

[0049] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. An integrated valve assembly for a high and low plunger of a wheel jack, comprising a valve body (1) and an oil tank (24), characterized in that: A shaft (7) passes through the top of the valve body (1), and a rocker seat (8) is connected to the top of the shaft (7); a sleeve (25) is fixed on one side of the rocker seat (8), and a top block (29) is connected inside the sleeve (25) by a spring (31); a guide rod (30) passes through the outer surface and back of the top block (29); guide grooves (32) are provided on the outer surface and back of the sleeve (25); and slots (28) are provided on the top and bottom of the sleeve (25). One end of the sleeve (25) has a handle (26) through it, and the outer surface and back of the handle (26) are fixed with a locking block (27); the bottom sides of the rocker (8) are connected to the first plunger (4) by the connecting rod (6), and the bottom of the two first plungers (4) are connected to the second plunger (5); the top sides of the valve body (1) are provided with a one-way throttle valve (10) and two plunger sleeves (3), and the top of the one-way throttle valve (10) is equipped with a reversing valve (9); Both plunger sleeves (3) have a low-pressure oil inlet (18) on one side inside, and a secondary low-pressure oil outlet (11) and a secondary high-pressure oil outlet (17) on the other side inside. Both plunger sleeves (3) are connected to a plunger support block (13) at the bottom, and both plunger support blocks (13) are equipped with a high-pressure check valve (12). Both plunger support blocks (13) are connected to a low-pressure check valve at the bottom through an intermediate connector (14). (15), and the bottom of both low-pressure check valves (15) is connected to an oil suction pipe (16); the valve body (1) is provided with a total high-pressure oil outlet (19) and a total low-pressure oil outlet (20) in the middle, the valve body (1) is equipped with an isolation check valve (22), the valve body (1) is equipped with an overflow valve (21) on one side, the bottom of the valve body (1) is connected to a return oil pipe (23) on both sides; the valve body (1) is equipped with a power reduction valve (2) on one side.

2. The integrated valve assembly of the high and low plunger of the wheel jack according to claim 1, characterized in that: The oil suction pipe (16) is connected to the oil tank (24), and the valve body (1) is installed on the top of the oil tank (24).

3. The integrated valve assembly of the high and low plunger of the wheel jack according to claim 1, characterized in that: The diameter of the first plunger (4) is greater than the diameter of the second plunger (5), and the inner diameter of the top of the plunger sleeve (3) is greater than the inner diameter of the bottom of the plunger sleeve (3). The first plunger (4) is slidably connected to the upper interior of the plunger sleeve (3), and the second plunger (5) is slidably connected to the lower interior of the plunger sleeve (3).

4. The integrated valve assembly of the high and low plunger of the wheel jack according to claim 3, characterized in that: The two ends of the connecting rod (6) are rotatably connected to the first plunger (4) and the rocker (8) respectively, and the rocker (8) is rotatably connected to the shaft (7).

5. The integrated valve assembly of the high and low plunger of the wheel jack according to claim 1, characterized in that: The handle (26) is detachably connected to the sleeve (25), and the locking block (27) is slidably connected to the locking groove (28).

6. The integrated valve assembly of the high and low plunger of the wheel jack according to claim 5, characterized in that: The longitudinal section of the slot (28) is arc-shaped, and the cross section of the slot (28) is "J"-shaped.

7. The integrated valve assembly of the high and low plunger of the wheel jack according to claim 5, characterized in that: The top block (29) is fitted into the handle (26), and the top block (29) is slidably connected to the guide groove (32) via the guide rod (30).

8. The integrated valve assembly of the high and low plunger of the wheel jack according to claim 7, characterized in that: The guide rod (30) is composed of bolts and nuts, and the guide rod (30) is detachably connected to the top block (29) and the guide groove (32).

9. The integrated valve assembly of the high and low plunger of the wheel jack according to claim 6, characterized in that: A transition groove (33) is provided on one side of the slot (28), and a positioning groove (34) is provided on one side of the transition groove (33). The top block (29) is detachably connected to the sleeve (25) through the positioning groove (34) and the slot (28).

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