Jack assembly with descending buffering function

Abstract

The utility model 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 utility model relates to the technical field of jack assembly, especially to a jack assembly with a descending buffer function. BACKGROUND

[0002] A jack is a tool widely used in the fields of automobile maintenance, mechanical assembly and heavy object carrying, etc. It is used to lift heavy objects by human power or mechanical force. In the use process of the traditional jack, especially in the descending stage of the object, the lack of effective buffer mechanism can easily lead to too fast descending speed and impact phenomenon, which not only can cause safety hazards to the operator, but also can cause damage to the lifted object.

[0003] Although some existing jacks attempt to achieve the buffer effect in the descending process by increasing damping devices, these solutions often have problems of complex structure, high cost or insufficient reliability. SUMMARY

[0004] The utility model considers the foregoing problem and is made, the utility model discloses a kind of jack assembly with a descending buffer function, cleverly set up damping valve in striker, the flow of oil liquid when piston drops can cooperate damping valve to play damping effect, can reduce descending speed, improve safety performance, and structure is simple, need not extra open hole, cost is lower.

[0005] To achieve the above object, the utility model provides a kind of jack assembly with a descending buffer function, including base, respectively located the outer sleeve and oil cylinder of the base two sides, located the piston rod in the oil cylinder, set in the base on oil inlet oil circuit and oil return oil circuit, located on the base on oil pump, located in the oil return pipeline in striker and with the steel ball of the striker is matched, the outer sleeve, base and the piston rod are enclosed and form oil storage cavity, the oil cylinder is equipped with plunger cavity, the oil pump is used to by the oil inlet oil circuit the oil liquid located in the oil storage cavity is delivered to the plunger cavity, still include the damping valve in the striker;

[0006] The oil return oil circuit includes oil return cavity and first pipeline for communicating the oil return cavity and the oil storage cavity, the striker is movably arranged in the oil return cavity, and the striker is provided with a mounting cavity, a first oil inlet for communicating the mounting cavity and the oil return cavity, and a first oil outlet for communicating the mounting cavity and the first pipeline, the damping valve is movably arranged in the mounting cavity, and the damping valve is provided with a damping cavity, a second oil inlet for communicating the mounting cavity and the damping cavity, and a second oil outlet for communicating the damping cavity and the first oil outlet, 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 and the first oil outlet is arranged between the end of the damping valve far away from the second oil inlet and the inner wall of the mounting cavity, when the damping valve is in the second position, the end of the damping valve far away from the second oil inlet is attached to the inner wall of the mounting cavity.

[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 the descending buffer function as described above further comprises a first compression spring, one end of the first compression spring is connected to the inner wall of the mounting cavity, and the other end of the first compression spring is connected to the damping valve, so as to drive the damping valve to remain in the first position.

[0010] The jack assembly with the descending buffer function as described above further comprises a second compression spring, the second compression spring is arranged in the oil return chamber, one end of the second compression spring is connected to the inner wall of the oil return chamber, and the other end of the second compression spring is connected to the striker, so as to drive the striker to move away from the steel ball.

[0011] The jack assembly with the descending buffer function as described above, the diameter of the third oil outlet is greater than the diameter of the second oil outlet.

[0012] The jack assembly with the descending buffer function as described above further comprises a lifting oil path, the lifting oil path comprises a second pipeline and a sealing valve, the oil inlet oil path comprises a third pipeline for connecting the oil pump and the oil storage chamber, one end of the second pipeline is connected to the plunger cavity of the oil cylinder, and the other end of the second pipeline is connected to the third pipeline through the sealing valve, and the oil return chamber is connected to the second pipeline and the third pipeline.

[0013] The jack assembly with the descending buffer function as described above, a shunt area penetrating through the third pipeline is arranged between the oil return chamber and the sealing valve, the steel ball is arranged in the shunt area, and one end of the striker can extend into the shunt area and abut against the steel ball.

[0014] The sealing valve comprises a valve body and a valve core, the valve body is provided with a first channel for connecting the second pipeline and the shunt area, the valve core comprises a blocking part and a driving part, the blocking part is located in the valve body, the blocking part is provided with a sealing slope which can be attached to one end of the first channel, one end of the driving part is connected with the blocking part, the other end is inserted into the first channel and can be connected with the steel ball through the first channel.

[0015] The sealing valve further comprises a sealing spring, the sealing spring is located in the valve body, one end of the sealing spring is connected with the valve body, and the other end is connected with the blocking part to drive the sealing slope to be attached to one end of the first channel.

[0016] The jack assembly with the descending buffer function further comprises a foot pedal, the foot pedal is pivotally connected to the base, the bottom of the foot pedal is provided with an abutting part which abuts against the outer side of the striker and can drive the striker to move towards the side close to the steel ball.

[0017] The jack assembly with the descending buffer function further comprises an operating handle, the oil pump comprises a pump body and a pump core, the pump core is arranged in the pump body in a lifting manner, one end of the operating handle is connected with the pump core for driving the pump core to ascend or descend.

[0018] The utility model discloses the following beneficial effects: when the object is descending along with the piston rod of the oil cylinder, the hydraulic oil can enter into the oil return cavity, the hydraulic oil in the oil return cavity can enter into the mounting cavity of the striker through the first oil inlet, the hydraulic oil in the mounting cavity can enter into the damping cavity through the second oil inlet, because the first oil inlet is larger than the second oil inlet, the oil pressure in the damping cavity is smaller, and then the hydraulic oil pushes the damping valve to move from the first position to the second position, at this time, the end of the damping valve is attached to the inner wall of the mounting cavity, can block the third oil outlet, only uses the second oil outlet to carry out the oil discharge, and the oil discharge speed is greatly reduced, which plays a damping buffer role on the piston rod, and the structure is relatively simple, and it is not necessary to additionally open a hole in the base. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure schematic view of example;

[0020] Figure 2 It is the whole structure cross section view of example;

[0021] Figure 3 It is the inside structure cross section view of base of example;

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

[0023] Figure 5 This is a cross-sectional view of the foot pedal and striker assembly of the jack assembly in the lifting state according to the embodiment;

[0024] Figure 6 This is a cross-sectional view of the foot pedal and striker assembly in the middle position of the jack assembly in the embodiment.

[0025] In the picture:

[0026] 1. Base; 11. Oil return chamber; 12. First pipe; 13. Second compression spring; 14. Second pipe; 15. Sealing valve; 151. Valve body; 152. Valve core; 152a. Sealing part; 152b. Drive part; 153. Sealing spring; 16. Third pipe; 2. Outer sleeve; 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 Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] like Figures 1-6 As shown, a jack assembly with a lowering buffer function includes a base 1, an outer sleeve 2 and a hydraulic cylinder 3 located on both sides of the base 1, a piston rod 31 located in the hydraulic cylinder 3, an oil inlet passage and an oil return passage opened on the base 1, an oil pump 4 located on the base 1, a striker 5 located in the oil return passage, and a steel ball 6 adapted to the striker 5. The outer sleeve 2, the base 1, and the piston rod 31 together form an oil storage chamber 21. The hydraulic cylinder 3 is provided with a plunger chamber 32. The oil pump 4 is used to transport the oil in the oil storage chamber 21 to the plunger chamber 32 of the hydraulic cylinder 3 through the oil inlet passage. It can drive the piston rod 31 to extend to lift the object. When the piston rod 31 lifts the object down, the oil flows back to the oil storage chamber 21 through the oil return passage, forming a cycle.

[0029] In order to realize the buffering of the piston rod 31 in the descending state, a damping valve 7 is further arranged in the striker 5, the oil return channel comprises an oil return cavity 11 and a first pipeline 12 for connecting the oil return cavity 11 and the oil storage cavity 21, the striker 5 is movably arranged in the oil return cavity 11, and the striker 5 is provided with a mounting cavity, a first oil inlet 52 for connecting the mounting cavity and the oil return cavity 11, and a first oil outlet 53 for connecting the mounting cavity and the first pipeline 12, so that the hydraulic oil in the plunger cavity 32 of the oil cylinder 3 will flow into the oil storage cavity 21 through the oil return cavity 11, the first oil inlet 52, the mounting cavity, the first oil outlet 53 and the first pipeline 12 in sequence during the descending of the piston rod 31, and 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 that 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, a third oil outlet 74 for connecting the damping cavity 71 and the first oil outlet 53 is arranged between the end of the damping valve 7 away from the second oil inlet 72 and the inner wall of the mounting cavity, so that when the damping valve 7 is in the first position, the hydraulic oil entering the damping cavity 71 will flow into the first oil outlet 53 through the second oil outlet 73 and the third oil outlet 74, and the flow rate is fast, and the descending speed of the piston rod 31 is also fast, and 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 close contact with the inner wall of the mounting cavity, and when the damping valve 7 is in the second position, the third oil outlet 74 is blocked, so that the oil can only flow out through the second oil outlet 73, and the flow rate is slow, and the descending speed of the piston rod 31 is also slow, and in the present application, because the diameter of the second oil inlet 72 is smaller than that of the first oil inlet 52, the oil pressure in the second damping cavity 71 is smaller than that in the mounting cavity, thereby driving the damping valve 7 to move from the first position to the second position, realizing automatic damping and improving the safety performance during the descending of the object, and because the damping valve 7 can be directly arranged in the striker 5, the structure is relatively simple, the structure of the base 1 does not need to be changed, and the oil inlet in the ascending state will not be affected.

[0030] In order to keep the initial position of the damping valve 7 in the first position, a first compression spring 75 is further arranged, the first compression spring 75 is arranged in the mounting cavity, one end of the first compression spring 75 is in contact with the inner wall of the mounting cavity, and the other end of the first compression spring 75 is in contact with the damping valve 7, so as to drive the damping valve 7 to keep in the first position, that is, the first compression spring 75 exerts an elastic force on the damping valve 7, and drives the damping valve 7 to keep in the first position, at this time the damping valve 7 does not work, and only when the piston rod 31 is in the 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 further included, which is located in the oil return cavity 11 and one end of which is in contact with the inner wall of the oil return cavity 11 and the other end of which is in contact with the striker 5 to drive the striker 5 to move away from the steel ball 6. In this state, the striker 5 does not actively drive the steel ball 6 to displace, and the steel ball 6 can move towards the side close to the striker 5 to seal the oil return cavity 11.

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

[0033] Specifically, the lifting oil way includes the second pipeline 14 and the sealing valve 15, and the oil inlet way includes the third pipeline 16 for connecting the oil pump 4 and the oil storage cavity 21. One end of the second pipeline 14 is in communication with the plunger cavity 32 of the oil cylinder 3, and the other end is in communication with the third pipeline 16 through the sealing valve 15. In the lifting state, the oil pump 4 draws the hydraulic oil in the oil storage cavity 21 through the third pipeline 16, and then discharges the hydraulic oil into the second pipeline 14 by pressing down. At this time, since the hydraulic oil in the second pipeline 14 is sealed by the steel ball 6 in the oil return cavity 11, the oil can only be discharged into the second pipeline 14 and finally flow into the plunger cavity 32 of the oil cylinder 3. It is worth noting that the sealing effect of the sealing valve 15 is to prevent the oil in the second pipeline 14 from flowing into the third pipeline 16, and the oil in the third pipeline 16 can normally flow into the second pipeline 14. The oil return cavity 11 is in communication with the second pipeline 14 and the third pipeline 16 at the same time, which is convenient for oil return.

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

[0035] Specifically, the sealing valve 15 comprises 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 and the shunt area, the valve core 152 comprises a blocking part 152a and a driving part 152b, the blocking part 152a is located in the valve body 151, and the blocking part 152a is provided with a sealing inclined surface which can be attached to one end of the first channel, because it is provided as an inclined surface, when the hydraulic oil flows from the first channel to the inside of the second pipeline 14, it can push away the blocking part 152a, thereby realizing one-way flow, and one end of the driving part 152b is connected with the blocking part 152a, and the other end is inserted into the first channel and can pass through the first channel and be connected with the steel ball 6, so that the striker 5 can drive the driving wheel to move through the steel ball 6, thereby driving the blocking part 152a to move and open the first channel, and in this state, the oil return can be carried out.

[0036] Specifically, the sealing valve 15 further comprises a sealing spring 153, the sealing spring 153 is located in the valve body 151, and one end of the sealing spring 153 is connected with the valve body 151 and the other end is connected with the blocking part 152a, so as to drive the sealing inclined surface to keep attached to one end of the first channel, the sealing spring 153 is used to provide elastic pre-tightening force for the blocking part 152a, so as to keep the blocking state, and after overcoming the elastic pre-tightening force, the first channel can be opened.

[0037] In order to facilitate operation, a foot pedal 8 is further provided, the foot pedal 8 is pivotally connected to the base 1, and the bottom of the foot pedal 8 is provided with an abutting part 81 which abuts against the outer side of the striker 5 and can drive the striker 5 to move towards 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 towards the side close to the steel ball 6, push away the steel ball 6, thereby opening the oil return cavity 11, and at the same time, the steel ball 6 drives the driving part 152b to move together, the driving part 152b drives the blocking part 152a to open the first channel, so as to facilitate oil return, and the striker 5 is convenient to control.

[0038] Specifically, an operating handle is further provided, the oil pump 4 comprises a pump body 41 and a pump core 42, the pump core 42 is arranged in the pump body 41 in a lifting manner, one end of the operating handle is connected with the pump core 42 and is used to drive the pump core 42 to ascend or descend, when the operating handle drives the pump core 42 to ascend, the pump core 42 sucks oil, and when the operating handle drives the pump core 42 to descend, the oil in the pump body 41 is discharged, thereby serving as a power source.

[0039] In the embodiment, the jack has three states in total, one is a lifting state, the second is a descending state, and the third is a middle state, when the jack is in the lifting state, it can lift the object, when the jack is in the descending state, it can connect with the object, and when the jack is in the middle state, it is convenient to adjust the angle of the operating handle.

[0040] Specifically, when the jack is in the lifting state, the abutting portion 81 under the footboard 8 is separated from the striker 5, the striker 5 is kept away from the steel ball 6, the steel ball 6 is pushed by the hydraulic oil, the sealing oil return cavity 11, the hydraulic oil in the oil storage cavity 21 extracted by the oil pump 4 is delivered into the second pipeline 14, and then enters the plunger cavity 32 of the oil cylinder 3 through the second pipeline 14; when the jack is in the descending state, the abutting portion 81 under the footboard 8 abuts against the striker 5, and the striker 5 drives the steel ball 6 to displace, the sealing valve 15 is opened by the steel ball 6 to open the first passage, at this time, the hydraulic oil in the plunger cavity 32 of the oil cylinder 3 enters the oil return cavity 11 through the second pipeline 14, and in this process, the damping valve 7 plays a damping role; when the jack is in the intermediate state, the footboard 8 is in the horizontal position, at this time, the striker 5 pushes the steel ball 6 away a little, but does not open the first passage, at this time, the oil pump 4 can smoothly extract the hydraulic oil in the oil storage cavity 21, and can smoothly return the oil, so that when the operating handle is adjusted, it can be smoothly rotated, and the rotating resistance is small.

[0041] The technical solutions of the present application are described in detail above with reference to the drawings, and the described embodiments are used to help understand the idea of the present application. The specific embodiments described in this paper are only illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications also change accordingly.

[0043] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0044] In the utility model, unless another definite provision and limitation, the term "connect", "fix" and so on should do the broad sense understanding, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two element inside's intercommunication or two element's mutual action relation, unless another definite limitation.For the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.

[0045] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.

Claims

1. A jack assembly with a descending buffer function, comprising a base, an outer sleeve 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 oil passage opened in the base, an oil pump located on the base, a striker located in the oil return oil passage, and a steel ball matched with the striker, the outer sleeve, the base and the piston rod form an oil storage cavity, the oil cylinder is provided with a plunger cavity, the oil pump is used for conveying the oil in the oil storage cavity to the plunger cavity through the oil inlet, characterized in that, The damping valve is arranged in the striker. The oil return passage comprises an oil return cavity and a first pipeline for connecting the oil return cavity and the oil storage cavity, the striker is movably arranged in the oil return cavity, and the striker is provided with a mounting cavity, a first oil inlet for connecting the mounting cavity and the oil return cavity, and a first oil outlet for connecting the mounting cavity and the first pipeline, the damping valve is movably arranged in the mounting cavity, and the damping valve is provided with a damping cavity, a second oil inlet for connecting the mounting cavity and the damping cavity, and a second oil outlet for connecting the damping cavity and the first oil outlet, 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 cavity and the first oil outlet is arranged between the end of the damping valve far away from the second oil inlet and the inner wall of the mounting cavity, when the damping valve is in the second position, the end of the damping valve far away from the second oil inlet is in contact with the inner wall of the mounting cavity. When the piston rod is in a descending state, the damping valve is driven to move from the first position to the second position.

2. The jack assembly with a descent cushioning function according to claim 1, wherein, The first compression spring is arranged in the mounting cavity, one end of the first compression spring is in contact with the inner wall of the mounting cavity, and the other end of the first compression spring is in contact with the damping valve, so as to drive the damping valve to remain in the first position.

3. The jack assembly with a descent cushioning function according to claim 2, characterized in that, The second compression spring is arranged in the oil return cavity, one end of the second compression spring is in contact with the inner wall of the oil return cavity, and the other end of the second compression spring is in contact with the striker, so as to drive the striker to move away from the steel ball.

4. The jack assembly with a descent cushioning function according to claim 1, wherein, The diameter of the third oil outlet is greater than the diameter of the second oil outlet.

5. The jack assembly with a descent cushioning function according to claim 1, wherein, The lifting oil passage comprises a second pipeline and a sealing valve, the oil inlet passage comprises a third pipeline for connecting the oil pump and the oil storage cavity, one end of the second pipeline is in communication with the plunger cavity of the oil cylinder, the other end of the second pipeline is in communication with the third pipeline through the sealing valve, and the oil return cavity is in communication with the second pipeline and the third pipeline.

6. The jack assembly with a descent cushioning function according to claim 5, wherein, The oil return cavity and the sealing valve are provided with a shunt area penetrating the third pipeline, the steel ball is arranged in the shunt area, and one end of the striker can extend into the shunt area and abut against the steel ball.

7. The jack assembly with a descent cushioning function according to claim 6, wherein The sealing valve comprises a valve body and a valve core, the valve body is provided with a first channel for connecting the second pipeline and the shunt area, the valve core comprises a blocking part and a driving part, the blocking part is arranged in the valve body, the blocking part is provided with a sealing slope capable of abutting against one end of the first channel, one end of the driving part is in contact with the blocking part, the other end of the driving part is inserted into the first channel and capable of penetrating the first channel to contact the steel ball.

8. The jack assembly with a descent cushioning function according to claim 7, wherein, The sealing valve further comprises a sealing spring, the sealing spring is arranged in the valve body, one end of the sealing spring is in contact with the valve body, and the other end of the sealing spring is in contact with the blocking part, so as to drive the sealing slope to remain in abutment with one end of the first channel.

9. The jack assembly with a descent cushioning function according to claim 1 or 7, wherein, The foot pedal is pivoted on the base, and the bottom of the foot pedal is provided with an abutting part which abuts against the outer side of the striker and drives the striker to move towards the side close to the steel ball.

10. The jack assembly with a descent cushioning function according to claim 1, wherein, The oil pump comprises a pump body and a pump core which is arranged in the pump body in a lifting manner, and one end of the operating handle is connected with the pump core for driving the pump core to lift or drop.

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