Jack assembly with descending buffering function

Abstract

The invention relates to the technical field of jacks, and particularly discloses a jack assembly with a descending buffering function. Comprising a base, an outer sleeve, an oil cylinder, a piston rod, an oil inlet path, an oil return path, an oil pump, a firing pin and a damping valve, wherein the outer sleeve and the oil cylinder are located on the two sides of the base respectively, the piston rod is located in a rod cavity of the oil cylinder, the oil inlet path and the oil return path are formed in the base, the oil pump is located on the base, the firing pin is located in the oil return path, and the damping valve is movably arranged in the firing pin. Hydraulic oil can enter the oil return cavity, the hydraulic oil in the oil return cavity can enter the mounting cavity of the firing pin through the first oil inlet, the hydraulic oil in the mounting cavity can enter the damping cavity through the second oil inlet, due to the fact that the first oil inlet is larger than the second oil inlet, the oil pressure in the damping cavity is small, and the hydraulic oil pushes the damping valve to move; the end of the damping valve is attached to the inner wall of the mounting cavity, the third oil outlet can be blocked, only the second oil outlet is used for discharging oil, the oil discharging speed is greatly reduced, and the damping and buffering effects on the piston rod can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of jack assemblies, in particular to a jack assembly with a descending buffering function. Background Art

[0002] A jack is a tool widely used in the fields of automobile maintenance, mechanical assembly and heavy object handling, and is used to lift heavy objects by human or mechanical force. During the use of a traditional jack, especially during the object's descent stage, due to the lack of an effective buffering mechanism, it is easy to cause the descent speed to be too fast and produce impact, which may not only cause safety hazards to the operator, but also cause damage to the lifted object.

[0003] Although some existing jacks attempt to achieve a buffering effect during the descent process by adding a damping device, these solutions often have problems such as complex structure, high cost or insufficient reliability. Summary of the invention

[0004] The present invention is made in consideration of the above-mentioned problems. The purpose of the invention is to provide a jack assembly with a descent buffering function. The damping valve is cleverly arranged in the striker. When the piston descends, the flow of oil can cooperate with the damping valve to achieve a damping effect, thereby reducing the descent speed and improving the safety performance. The invention has a simple structure, does not require additional holes, and has a low cost.

[0005] To achieve the above-mentioned purpose, the present invention provides a jack assembly with a descending buffering function, comprising a base, a jacket and an oil cylinder respectively located on both sides of the base, a piston rod located in the oil cylinder, an oil inlet oil path and an oil return oil path provided on the base, an oil pump located on the base, a striker located in the oil return pipeline, and a steel ball matched with the striker, the jacket, the base and the piston rod together form an oil storage chamber, a plunger chamber is provided in the oil cylinder, the oil pump is used to transport the oil located in the oil storage chamber to the plunger chamber through the oil inlet oil path, and also includes a damping valve located in the striker;

[0006] The oil return oil circuit includes an oil return chamber and a first pipeline for connecting the oil return chamber with the oil storage chamber, the striker is movably arranged in the oil return chamber, and the striker is provided with a mounting chamber, a first oil inlet for connecting the mounting chamber with the oil return chamber, and a first oil outlet for connecting the mounting chamber with the first pipeline, the damping valve is movably arranged in the mounting chamber, and the damping valve is provided with a damping chamber, a second oil inlet for connecting the mounting chamber with the damping chamber, and a second oil outlet for connecting the damping chamber with the first oil outlet, and the diameter of the second oil inlet is smaller than the diameter of the first oil inlet;

[0007] The damping valve has a first position and a second position. When the damping valve is in the first position, a third oil outlet for connecting the damping chamber with the first oil outlet is provided between an end of the damping valve away from the second oil inlet and the inner wall of the mounting chamber. When the damping valve is in the second position, an end of the damping valve away from the second oil inlet is in contact with the inner wall of the mounting chamber.

[0008] When the piston rod is in a descending state, the damping valve can be driven to move from the first position to the second position.

[0009] The jack assembly with a descent buffering function described above also includes a first compression spring, one end of which is connected to the inner wall of the mounting cavity, and the other end of which is connected to the damping valve to drive the damping valve to remain in the first position.

[0010] The jack assembly with a descent buffering function described above also includes a second compression spring, which is located in the oil return chamber, and one end of the second compression spring is connected to the inner wall of the oil return chamber, and the other end is connected to the striker to drive the striker to move toward the side away from the steel ball.

[0011] According to the above-mentioned jack assembly with descent buffering function, the diameter of the third oil outlet is larger than the diameter of the second oil outlet.

[0012] According to the above-mentioned jack assembly with a descent buffering function, it also includes a lifting oil circuit, the lifting oil circuit includes a second pipeline and a sealing valve, the oil inlet circuit includes a third pipeline for connecting the oil pump and the oil storage chamber, one end of the second pipeline is connected to the plunger chamber of the oil cylinder, and the other end is connected to the third pipeline through a sealing valve, and the oil return chamber is connected to the second pipeline and the third pipeline at the same time.

[0013] According to the above-mentioned jack assembly with a descent buffering function, a diversion area that runs through the third pipe is provided between the return oil chamber and the sealing valve, the steel ball is located in the diversion area, and one end of the striker can extend into the diversion area and can abut against the steel ball.

[0014] According to the above-mentioned jack assembly with a descent buffering function, the sealing valve includes a valve body and a valve core, the valve body is provided with a first channel for connecting the second pipeline with the diversion area, the valve core includes a blocking part and a driving part, the blocking part is located in the valve body, and the blocking part is provided with a sealing inclined surface that can be fitted with one end of the first channel, one end of the driving part is connected to the blocking part, and the other end is inserted in the first channel, and can pass through the first channel to connect with the steel ball.

[0015] According to the above-mentioned jack assembly with a descent buffering function, the sealing valve also includes a sealing spring, which is located in the valve body, and one end of the sealing spring is connected to the valve body, and the other end is connected to the blocking portion to drive the sealing slope to maintain contact with one end of the first channel.

[0016] The jack assembly with a descent buffering function described above also includes a foot pedal, which is pivotally connected to the base, and a contact portion is provided at the bottom of the foot pedal to contact the outer side of the striker and can drive the striker to move toward the side close to the steel ball.

[0017] The jack assembly with a descent buffering function described above also includes an operating handle, the oil pump includes a pump body and a pump core, the pump core is arranged in the pump body in a liftable manner, and one end of the operating handle is connected to the pump core for driving the pump core to rise or fall.

[0018] The present invention has the following beneficial effects: when an object descends with the piston rod of the oil cylinder, its hydraulic oil can enter the oil return chamber, the hydraulic oil in the oil return chamber can enter the mounting chamber of the striker through the first oil inlet, and the hydraulic oil in the mounting chamber can enter the damping chamber through the second oil inlet. Since the first oil inlet is larger than the second oil inlet, the oil pressure in the damping chamber is smaller, and the hydraulic oil pushes the damping valve from the first position to the second position. At this time, the end of the damping valve fits the inner wall of the mounting chamber, and the third oil outlet can be blocked. Only the second oil outlet is used for oil outlet, and the oil outlet speed is greatly reduced, which will play a damping and buffering role on the piston rod. Its structure is relatively simple, and there is no need to open additional holes on the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0020] Figure 2 is a cross-sectional view of the overall structure of the embodiment;

[0021] Figure 3 is a cross-sectional view of the internal structure of the base of the embodiment;

[0022] Figure 4 is a cross-sectional view of the assembly of the foot pedal and the striker of the embodiment in a lowered state;

[0023] Figure 5 is a cross-sectional view of the assembly of the foot pedal and the striker of the embodiment in a lifted state;

[0024] Figure 6 It is a cross-sectional view of the pedal and striker assembly of the jack assembly of the embodiment in the mid-range state.

[0025] In the figure:

[0026] 1. Base; 11. Oil return chamber; 12. First pipeline; 13. Second compression spring; 14. Second pipeline; 15. Sealing valve; 151. Valve body; 152. Valve core; 152a. Sealing part; 152b. Driving part; 153. Sealing spring; 16. Third pipeline; 2. Jacket; 21. Oil storage chamber; 3. Oil cylinder; 31. Piston rod; 32. Plunger chamber; 4. Oil pump; 41. Pump body; 42. Pump core; 5. Strike pin; 52. First oil inlet; 53. First oil outlet; 6. Steel ball; 7. Damping valve; 71. Damping chamber; 72. Second oil inlet; 73. Second oil outlet; 74. Third oil outlet; 75. First compression spring; 8. Foot pedal; 81. Abutment part. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0028] like Figure 1-6 As shown, a jack assembly with a descent buffering function includes a base 1, a sleeve 2 and a cylinder 3 respectively located on both sides of the base 1, a piston rod 31 located in the cylinder 3, an oil inlet circuit and an oil return circuit opened on the base 1, an oil pump 4 located on the base 1, a striker 5 located in the oil return circuit and a steel ball 6 matched with the striker 5. The sleeve 2, the base 1 and the piston rod 31 together form an oil storage chamber 21, a plunger chamber 32 is provided in the cylinder 3, and the oil pump 4 is used for conveying the oil in the oil storage chamber 21 to the plunger chamber 32 of the cylinder 3 through the oil inlet circuit, which can drive the piston rod 31 to extend to drive the object to rise, and when the piston rod 31 drives the object to descend, the oil flows back to the oil storage chamber 21 through the oil return circuit to form a cycle.

[0029] In order to achieve buffering when the piston rod 31 is in a descending state, a damping valve 7 is also included in the striker 5. The oil return oil circuit includes an oil return chamber 11 and a first pipeline 12 for connecting the oil return chamber 11 with the oil storage chamber 21. The striker 5 is movably arranged in the oil return chamber 11, and the striker 5 is provided with an installation chamber, a first oil inlet 52 for connecting the installation chamber with the oil return chamber 11, and a first oil outlet 53 for connecting the installation chamber with the first pipeline 12. In the process of the piston rod 31 descending, the hydraulic oil in the plunger chamber 32 of the oil cylinder 3 will pass through the oil return chamber 11, the first oil inlet 52, the installation chamber 11, and the first oil outlet 53. The mounting cavity, the first oil outlet 53 and the first pipeline 12 enter the oil storage cavity 21. Therefore, the hydraulic oil must pass through the striker 5. The damping valve 7 is movably arranged in the mounting cavity, and the damping valve 7 is provided with a damping cavity 71, a second oil inlet 72 for connecting the mounting cavity and the damping cavity 71, and a second oil outlet 73 for connecting the damping cavity 71 and the first oil outlet 53, wherein the diameter of the second oil inlet 72 is smaller than the diameter of the first oil inlet 52, and the damping valve 7 has a first position and a second position. When the damping valve 7 is in the first position, the damping valve 7 is away from the second position. A third oil outlet 74 for connecting the damping chamber 71 with the first oil outlet 53 is provided between one end of the oil inlet 72 and the inner wall of the installation chamber. Therefore, when the damping valve 7 is in the first position, the hydraulic oil entering the damping chamber 71 will flow into the first oil outlet 53 through the second oil outlet 73 and the third oil outlet 74. The flow rate is fast, and the descending speed of the piston rod 31 is also fast. When the damping valve 7 is in the second position, the end of the damping valve 7 away from the second oil inlet 72 is in contact with the inner wall of the installation chamber. When it is in the second position, the third oil outlet 74 is blocked. Therefore, oil can only be discharged through the second oil outlet 73, and the oil outlet speed is slow, and the descending speed of the piston rod 31 is also slow. In the present application, since the diameter of the second oil inlet 72 is smaller than the diameter of the first oil inlet 52, the oil pressure in the second damping chamber 71 is smaller than the oil pressure in the installation chamber, thereby driving the damping valve 7 to move from the first position to the second position, realizing automatic damping, and improving the safety performance of the object during its descent. Moreover, since the damping valve 7 can be directly set in the striker 5, its structure is relatively simple, and there is no need to change the structure of the base 1, and it will not affect the oil intake in the rising state.

[0030] In order to keep the initial position of the damping valve 7 at the first position, a first compression spring 75 is also included. One end of the first compression spring 75 is connected to the inner wall of the installation cavity, and the other end of the first compression spring 75 is connected to the damping valve 7 to drive the damping valve 7 to remain in the first position, that is, the first compression spring 75 is used to apply elastic force to the damping valve 7 to drive it to remain in the first position. At this time, the damping valve 7 will not work. Only when the piston rod 31 is in a descending state, the damping valve 7 is driven to move to the second position by the hydraulic oil. At this time, the damping valve 7 plays a damping role.

[0031] In order to ensure that the striker 5 does not affect the normal operation of the oil during the rising process, a second compression spring 13 is also included. The second compression spring 13 is located in the oil return chamber 11, and one end of the second compression spring 13 is connected to the inner wall of the oil return chamber 11, and the other end is connected to the striker 5 to drive the striker 5 to move toward the side away from the steel ball 6. In this state, the striker 5 will not actively drive the steel ball 6 to move, and the steel ball 6 can also move toward the side close to the striker 5 to seal the oil return chamber 11.

[0032] In order to improve the oil return buffering effect, the diameter of the third oil outlet 74 should be larger than the diameter of the second oil outlet 73. When the third oil outlet 74 is blocked, the oil return flow speed is very slow and the piston rod 31 descends more slowly, thereby improving the buffering effect.

[0033] Specifically, it also includes a lifting oil circuit, which includes a second pipeline 14 and a sealing valve 15. The oil inlet circuit includes a third pipeline 16 for connecting the oil pump 4 with the oil storage chamber 21. One end of the second pipeline 14 is connected to the plunger chamber 32 of the oil cylinder 3, and the other end is connected to the third pipeline 16 through the sealing valve 15. In the lifting state, the oil pump 4 extracts the hydraulic oil in the oil storage chamber 21 through the third pipeline 16, and then discharges the hydraulic oil into the second pipeline 14 by pressing down. At this time, due to the hydraulic pressure in the second pipeline 14, the steel ball 6 seals the return oil chamber 11, so the oil can only be discharged into the second pipeline 14, and finally flows into the plunger chamber 32 of the oil cylinder 3. It is worth noting that the sealing valve 15 plays a sealing role in preventing the oil in the second pipeline 14 from flowing into the third pipeline 16. The oil in the third pipeline 16 can flow into the second pipeline 14 normally, and the return oil chamber 11 is simultaneously connected to the second pipeline 14 and the third pipeline 16, which is convenient for oil return.

[0034] Specifically, a flow diversion area penetrating the third pipe 16 is provided between the oil return chamber 11 and the sealing valve 15 , the steel ball 6 is located in the flow diversion area, and one end of the striker 5 can extend into the flow diversion area and abut against the steel ball 6 .

[0035] Specifically, the sealing valve 15 includes a valve body 151 and a valve core 152. The valve body 151 is provided with a first channel for connecting the second pipeline 14 with the diversion area. The valve core 152 includes a blocking portion 152a and a driving portion 152b. The blocking portion 152a is located in the valve body 151, and the blocking portion 152a is provided with a sealing inclined surface that can be fitted with one end of the first channel. Since it is set as an inclined surface, when the hydraulic oil flows from the first channel to the inner side of the second pipeline 14, it can push the blocking portion 152a away, thereby realizing one-way circulation. One end of the driving portion 152b is connected to the blocking portion 152a, and the other end is inserted in the first channel and can pass through the first channel to connect with the steel ball 6. The striker 5 can drive the driving wheel to move through the steel ball 6, thereby driving the blocking portion 152a to move and open the first channel. In this state, oil return can be performed.

[0036] Specifically, the sealing valve 15 also includes a sealing spring 153, which is located in the valve body 151, and one end of the sealing spring 153 is connected to the valve body 151, and the other end is connected to the blocking portion 152a to drive the sealing slope to maintain contact with one end of the first channel. The sealing spring 153 is used to provide an elastic preload force for the blocking portion 152a to maintain a blocked state, and after overcoming the elastic preload force, it can be driven to open the first channel.

[0037] For the convenience of operation, it also includes a foot pedal 8, which is pivotally connected to the base 1, and the bottom of the foot pedal 8 is provided with an abutment portion 81 that abuts against the outer side of the striker 5, and can drive the striker 5 to move toward the side close to the steel ball 6, that is, when the foot pedal 8 is stepped on, it can drive the striker 5 to move toward the side close to the steel ball 6, push the steel ball 6 away, and then open the oil return chamber 11, and at the same time use the steel ball 6 to drive the driving portion 152b to move together, and the driving portion 152b drives the blocking portion 152a to open the first channel, which is convenient for oil return and the striker 5 is easy to control.

[0038] Specifically, it also includes an operating handle. The oil pump 4 includes a pump body 41 and a pump core 42. The pump core 42 is arranged in the pump body 41 in a liftable manner. One end of the operating handle is connected to the pump core 42, and is used to drive the pump core 42 to rise or fall. When it drives the pump core 42 to rise, the pump core 42 is used to suck in oil. When it drives the pump core 42 to fall, it discharges the oil in the pump body 41 and acts as a power source.

[0039] In this embodiment, the jack has three states, one is the lifting state, the second is the lowering state, and the third is the mid-range state. When it is in the lifting state, it can lift objects; when it is in the lowering state, it can drive objects to connect; when it is in the mid-range state, it is convenient to adjust the angle of the operating handle.

[0040] Specifically, when the jack is in the lifting state, the abutment 81 under the foot pedal 8 is separated from the striker 5, and the striker 5 is kept at a position away from the steel ball 6. The steel ball 6 is pushed by the hydraulic oil to seal the oil chamber 11, and the hydraulic oil in the oil storage chamber 21 is extracted by the oil pump 4 and transported to the second pipe 14, and then enters the plunger chamber 32 of the oil cylinder 3 through the second pipe 14; when the jack is in the descending state, the abutment 81 under the foot pedal 8 is in contact with the striker 5, and the steel ball 6 is driven to move through the striker 5, and the steel ball 6 is used to move. 6 drives the sealing valve 15 to open the first channel. At this time, the hydraulic oil in the plunger chamber 32 of the oil cylinder 3 enters the oil return chamber 11 through the second pipe 14. In this process, the damping valve 7 plays a damping role; when the jack is in the mid-range state, the foot pedal 8 is in a horizontal position. At this time, the striker 5 pushes the steel ball 6 a little, but does not open the first channel. At this time, the oil pump 4 can smoothly extract the hydraulic oil in the oil storage chamber 21 and can smoothly return the oil. Therefore, when adjusting the operating handle, it can be rotated smoothly with less rotation resistance.

[0041] The technical solution of the present invention is described in detail above in conjunction with the accompanying drawings, and the described embodiments are used to help understand the concept of the present invention. The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art of the invention may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

[0042] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A jack assembly with a descending buffering function, comprising a base, a jacket and an oil cylinder respectively located on both sides of the base, a piston rod located in the oil cylinder, an oil inlet and an oil return line provided on the base, an oil pump located on the base, a striker located in the oil return line, and a steel ball matched with the striker, the jacket, the base and the piston rod together form an oil storage chamber, a plunger chamber is provided in the oil cylinder, the oil pump is used to transport the oil located in the oil storage chamber to the plunger chamber through the oil inlet line, and is characterized in that: Also included is a damping valve located within the striker; The oil return oil circuit includes an oil return chamber and a first pipeline for connecting the oil return chamber with the oil storage chamber, the striker is movably arranged in the oil return chamber, and the striker is provided with a mounting chamber, a first oil inlet for connecting the mounting chamber with the oil return chamber, and a first oil outlet for connecting the mounting chamber with the first pipeline, the damping valve is movably arranged in the mounting chamber, and the damping valve is provided with a damping chamber, a second oil inlet for connecting the mounting chamber with the damping chamber, and a second oil outlet for connecting the damping chamber with the first oil outlet, and the diameter of the second oil inlet is smaller than the diameter of the first oil inlet; The damping valve has a first position and a second position. When the damping valve is in the first position, a third oil outlet for connecting the damping chamber with the first oil outlet is provided between an end of the damping valve away from the second oil inlet and the inner wall of the mounting chamber. When the damping valve is in the second position, an end of the damping valve away from the second oil inlet is in contact with the inner wall of the mounting chamber. When the piston rod is in a descending state, the damping valve can be driven to move from the first position to the second position.

2. A jack assembly with a descent buffering function according to claim 1, characterized in that: It also includes a first compression spring, one end of which is connected to the inner wall of the installation cavity, and the other end of which is connected to the damping valve to drive the damping valve to remain in the first position.

3. The jack assembly with a descent buffering function according to claim 2, characterized in that: It also includes a second compression spring, which is located in the oil return chamber, and one end of the second compression spring is connected to the inner wall of the oil return chamber, and the other end is connected to the striker to drive the striker to move toward the side away from the steel ball.

4. The jack assembly with a descent buffering function according to claim 1, characterized in that: A diameter of the third oil outlet is greater than a diameter of the second oil outlet.

5. The jack assembly with a descent buffering function according to claim 1, characterized in that: It also includes a lifting oil circuit, which includes a second pipeline and a sealing valve. The oil inlet circuit includes a third pipeline for connecting the oil pump and the oil storage chamber. One end of the second pipeline is connected to the plunger chamber of the oil cylinder, and the other end is connected to the third pipeline through a sealing valve. The oil return chamber is connected to the second pipeline and the third pipeline at the same time.

6. The jack assembly with a descent buffering function according to claim 5, characterized in that: A flow diversion area penetrating the third pipe is provided between the oil return chamber and the sealing valve, the steel ball is located in the flow diversion area, and one end of the striker can extend into the flow diversion area and abut against the steel ball.

7. The jack assembly with a descent buffering function according to claim 6, characterized in that: The sealing valve includes a valve body and a valve core. The valve body is provided with a first channel for connecting the second pipeline with the diversion area. The valve core includes a blocking part and a driving part. The blocking part is located in the valve body, and the blocking part is provided with a sealing inclined surface that can be fitted with one end of the first channel. One end of the driving part is connected to the blocking part, and the other end is inserted into the first channel and can pass through the first channel to connect with the steel ball.

8. The jack assembly with a descent buffering function according to claim 7, characterized in that: The sealing valve further comprises a sealing spring, which is located in the valve body, and one end of the sealing spring is connected to the valve body, and the other end of the sealing spring is connected to the blocking portion, so as to drive the sealing slope to keep in contact with one end of the first channel.

9. A jack assembly with a descent buffering function according to claim 1 or 7, characterized in that: The utility model also comprises a foot pedal, which is pivotally connected to the base, and a contact part is provided at the bottom of the foot pedal for contacting with the outer side of the striker and driving the striker to move toward the side close to the steel ball.

10. The jack assembly with a descent buffering function according to claim 1, characterized in that: It also includes an operating handle. The oil pump includes a pump body and a pump core. The pump core is arranged in the pump body in a liftable manner. One end of the operating handle is connected to the pump core for driving the pump core to rise or fall.

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