A lifting device for automobile repair

Abstract

This invention discloses a lifting device for automobile repair, comprising an oil tank, an oil cylinder, and an oil pump. An oil suction pipe is provided between the input end of the oil pump and the oil tank, and a first one-way valve is installed on the oil suction pipe. An oil discharge pipe is provided between the output end of the oil pump and the oil cylinder, and a second one-way valve is installed on the oil discharge pipe. A return pipe is provided between the oil cylinder and the oil tank, and a shut-off valve is installed on the return pipe. An end cap is fixedly installed at the upper end of the oil tank. A piston plate is slidably and sealed inside the oil tank. A lifting airbag is provided between the piston plate and the end cap. The oil cylinder includes a piston rod, a piston body, and a cylinder body. A fixed pulley is rotatably installed on the end cap, and a pull rope is installed on the fixed pulley. The two ends of the pull rope are fixedly connected to the piston plate and the piston body, respectively. This invention improves the load-bearing capacity of the piston rod of the hydraulic jack by setting a lifting airbag and pulley structure between the oil cylinder and the oil tank, making the piston body less prone to oil leakage and damage.

Description

Technical Field

[0001] This invention relates to automobile repair machinery, and more particularly to a lifting device for automobile repair. Background Technology

[0002] When repairing a car, the parts being repaired are usually located in special positions such as the bottom of the vehicle. Repairs often require lifting the car. Existing lifting equipment mostly uses single mobile jacks as repair tools or as larger pieces of equipment. A jack is a small lifting device that uses a rigid lifting component as its working device, lifting heavy objects within its stroke through a top support or bottom claw. Jacks are mainly used in factories, mines, transportation, and other departments for vehicle repair and other lifting and supporting work. Their structure is lightweight, sturdy, flexible, and reliable, and can be carried and operated by one person. Hydraulic jacks are based on Pascal's principle, which states that the pressure is uniform throughout a fluid. Therefore, in a balanced system, a smaller piston applies less pressure, while a larger piston applies more pressure, thus maintaining the fluid's stillness. Therefore, through the transmission of fluid pressure, different pressures can be obtained at different ends, achieving a transformation. However, existing hydraulic jacks have weak piston load capacity and are prone to oil leaks and damage. Summary of the Invention

[0003] The present invention aims to solve the problems existing in the prior art by providing a lifting device for automobile repair, which enhances the load capacity and solves the problems of easy oil leakage and damage at the piston.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: A lifting device for automobile repair includes an oil tank, an oil cylinder, and an oil pump. An oil suction pipe is provided between the input end of the oil pump and the oil tank, and a first one-way valve is provided on the oil suction pipe. An oil discharge pipe is provided between the output end of the oil pump and the oil cylinder, and a second one-way valve is provided on the oil discharge pipe. A return pipe is provided between the oil cylinder and the oil tank, and a shut-off valve is provided on the return pipe. The oil pump includes a lever, a pump body, and a plunger. The lever is rotatably connected to the pump body, and the pump body and the plunger are slidably connected. A lifting transmission mechanism is provided between the upper end of the plunger and the lever. The characteristic feature is that the oil tank... An end cap is fixedly installed at the upper end. A piston plate is slidably and sealed inside the oil storage tank. A lifting airbag is provided between the piston plate and the end cap. A venting pipe is provided on the lifting airbag. An air valve is provided on the venting pipe. The oil cylinder includes a piston rod, a piston body, and a cylinder body. A fixed pulley is rotatably installed on the end cap. A pull rope is installed on the fixed pulley. The two ends of the pull rope are fixedly connected to the piston plate and the piston body, respectively. A pressing air pump is fixedly installed on the lower side of the lever. The pressing air pump has an air inlet and an air outlet. A third one-way valve is provided on the air inlet. An air supply pipe is provided between the air outlet and the lifting airbag. A fourth one-way valve is provided on the air supply pipe.

[0005] Further improvements include a valve body, a valve seat, and a reset bolt. The valve seat is located in the return pipe, the inner end of the reset bolt is sealed to the valve seat, the reset bolt is threaded to the valve body, the vent pipe is provided with a vent port, and the air valve is a plug, the outer end of the plug is rotatably connected to the outer end of the reset bolt.

[0006] Further improvements include: the cylinder body is located inside the oil storage tank; the piston plate has an annular structure; the inner hole of the piston plate is slidably and sealed to the outer wall of the cylinder body; the end cover is slidably connected to the piston rod; and at least two sets of fixed pulleys are distributed circumferentially on the end cover.

[0007] In a further improvement, the lifting transmission mechanism includes a driving gear and a driven rack. The lever is fixedly connected to the driving gear, the driving gear meshes with the driven rack, and the driven rack is fixedly connected to the plunger.

[0008] Further improvements include the fourth one-way valve located at the air outlet, and the air supply pipe and the air venting pipe being interconnected and equipped with a three-way reversing lock-up valve.

[0009] To further improve the design, the lifting airbag is equipped with a safety unloading valve.

[0010] Further improvements include an end hole at the lower end of the piston rod, a sliding seal connection to a height limiting tube within the end hole, a height limiting hole on the upper side wall of the height limiting tube, and a fixed lower end of the height limiting tube connected to the interior of the oil storage tank.

[0011] Compared with the prior art, the beneficial effects of the present invention are: by setting a lifting airbag and pulley structure between the oil cylinder and the oil tank, the present invention improves the load capacity of the piston rod of the hydraulic jack, making the piston body less prone to oil leakage and damage. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention;

[0013] Explanation of reference numerals in the attached diagram: 100, oil storage tank; 110, return pipe; 120, shut-off valve; 121, valve body; 122, valve seat; 123, reset bolt; 130, end cap; 131, fixed pulley; 132, pull rope; 140, piston plate; 150, lifting airbag; 151, vent pipe; 152, air valve; 153, press-type air pump; 154, air inlet; 155, air outlet; 156, third check valve; 157, air supply pipe; 158, fourth check valve; 159, vent. 200, oil cylinder; 210, oil suction pipe; 220, oil discharge pipe; 230, piston rod; 231, end hole; 232, height limit pipe; 233, height limit hole; 240, piston body; 250, cylinder body; 260, three-way reversing lock-up valve; 270, safety unloading valve; 300, oil pump; 310, first check valve; 320, second check valve; 330, lever; 340, pump body; 350, plunger; 360, lifting transmission mechanism; 361, driving gear; 362, driven rack. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings:

[0015] See attached document Figure 1This embodiment 1 describes a lifting device for automobile repair, comprising an oil tank 100, an oil cylinder 200, and an oil pump 300. An oil suction pipe 210 is provided between the input end of the oil pump 300 and the oil tank 100, and a first one-way valve 310 is provided on the oil suction pipe 210. An oil discharge pipe 220 is provided between the output end of the oil pump 300 and the oil cylinder 200, and a second one-way valve 320 is provided on the oil discharge pipe 220. A return pipe 110 is provided between the oil cylinder 200 and the oil tank 100, and a shut-off valve 120 is provided on the return pipe 110. The oil pump 300 includes a lever 330, a pump body 340, and a plunger 350. The lever 330 is rotatably connected to the pump body 340, and the pump body 340 is slidably connected to the plunger 350. A lifting transmission mechanism 360 is provided between the upper end of the plunger 350 and the lever 330. The characteristic feature is that an end cap 1 is fixedly installed on the upper end of the oil tank 100. 30. A piston plate 140 is slidably and sealed inside the oil storage tank 100. A lifting airbag 150 is provided between the piston plate 140 and the end cover 130. A venting pipe 151 is provided on the lifting airbag 150. An air valve 152 is provided on the venting pipe 151. The oil cylinder 200 includes a piston rod 230, a piston body 240 and a cylinder body 250. A fixed pulley 131 is rotatably installed on the end cover 130. A pull rope 132 is installed on the fixed pulley 131. The two ends of the pull rope 132 are fixedly connected to the piston plate 140 and the piston body 240, respectively. A pressing air pump 153 is fixedly installed on the lower side of the lever 330. The pressing air pump 153 is provided with an air inlet 154 and an air outlet 155. A third one-way valve 156 is provided on the air inlet 154. An air supply pipe 157 is provided between the air outlet 155 and the lifting airbag 150. A fourth one-way valve 158 is provided on the air supply pipe 157.

[0016] Working principle: In use, place the device under the vehicle, then crank lever 330. Lever 330, through lifting transmission mechanism 360, drives plunger 350 to reciprocate vertically on pump body 340. When plunger 350 moves upward, hydraulic oil in oil tank 100 is drawn into pump body 340 through oil suction pipe 210. When plunger 350 moves downward, hydraulic oil in pump body 340 is pumped into cylinder 250 through oil discharge pipe 220, causing piston 240 to move upward, pushing piston rod 230 to extend and lift the vehicle. First check valve 310 and second check valve 320 prevent hydraulic oil backflow. During this process, the liquid level in the oil tank 100 gradually decreases, causing the piston plate 140 to slowly move downwards. The piston plate 140 pulls the pull rope 132 downwards, and the pull rope 132, after being reversed by the fixed pulley 131, generates an upward pulling force on the piston body 240. At the same time, the lever 330 continuously presses the pressing air pump 153. The pressing air pump 153 draws in air through the air inlet 154 and pumps it out through the air outlet 155. The gas is input into the lifting airbag 150 through the air supply pipe 157. The lifting airbag 150 expands in volume and further presses down the piston plate 140. The above three forces converge and act on the piston body 240 and the piston rod 230, greatly improving the load capacity of the hydraulic jack, which can lift heavier vehicles. Moreover, the load on the piston body 240 can be distributed to the lifting airbag 150 and the piston plate 140, making it less likely for oil leakage and damage to occur at the piston body 240. The third check valve 156 and the fourth check valve 158 prevent gas backflow. After use, opening the shut-off valve 120 and the air valve 152 causes the piston rod 230 to move down to release pressure and reset. The hydraulic oil in the cylinder 250 flows back to the oil tank 100 through the return pipe 110, and the gas in the lifting airbag 150 is released into the atmosphere through the vent pipe 151. After closing the shut-off valve 120 and the air valve 152 again, the equipment can be put back into use.

[0017] Example 2 differs from Example 1 only in that, to achieve the simultaneous opening and closing of the shut-off valve 120 and the air valve 152, the shut-off valve 120 includes a valve body 121, a valve seat 122, and a reset bolt 123. The valve seat 122 is located in the return pipe 110, and the inner end of the reset bolt 123 is sealed to the valve seat 122. The reset bolt 123 is threadedly connected to the valve body 121. The vent pipe 151 has a vent port 159. The air valve 152 is a plug, and the outer end of the plug is rotatably connected to the outer end of the reset bolt 123. When the reset bolt 123 is screwed in, the inner end of the reset bolt 123 seals with the valve seat 122 to cut off the return pipe 110, and the reset bolt 123 presses the plug into the vent port 159, thus sealing the vent pipe 151. When the reset bolt 123 is unscrewed, the inner end of the reset bolt 123 separates from the valve seat 122, opening the return pipe 110; the reset bolt 123 stops pressing the plug, and the plug automatically falls off the vent 159, thus opening the vent pipe 151.

[0018] Example 3 differs from Example 1 only in that, to make the equipment structure more compact and the force distribution more balanced, the cylinder 250 is located inside the oil storage tank 100, which reduces the size of the equipment. The piston plate 140 has an annular structure, and its inner hole is slidably sealed to the outer wall of the cylinder 250, which improves the positioning accuracy of the piston plate 140. The end cap 130 is slidably connected to the piston rod 230, which improves the positioning accuracy of the piston rod 230. The end cap 130 has at least two sets of fixed pulleys 131 distributed circumferentially, which ensures that the piston rod 230 is subjected to uniform force.

[0019] Example 4 differs from Example 1 only in that, for greater effort reduction and improved work efficiency, the lifting transmission mechanism 360 includes a driving gear 361 and a driven rack 362. The lever 330 is fixedly connected to the driving gear 361, the driving gear 361 meshes with the driven rack 362, and the driven rack 362 is fixedly connected to the plunger 350. (See attached diagram) Figure 1 As shown, when lever 330 swings downward, the driving gear 361 engages with the driven rack 362, causing the plunger 350 to move upward. The upward movement of the plunger 350 is the oil suction stroke. Simultaneously, lever 330 presses down on the press pump 153, causing the lifting airbag 150 to expand and push the piston plate 140 downward, promoting the flow of hydraulic oil from the oil reservoir 100 into the pump body 340. Similarly, when lever 330 swings upward, the press pump 153 springs up to draw in air, and the plunger 350 moves downward to pump hydraulic oil into the oil pump 300. Since the press pump 153 generally has a return spring inside, it can reduce effort.

[0020] Example 5 differs from Example 1 only in that, to achieve self-locking and safety functions, the fourth one-way valve 158 is located on the air outlet 155, and the air supply pipe 157 and the air vent pipe 151 are interconnected and equipped with a three-way reversing lock-up valve 260. The three-way reversing lock-up valve 260 serves as a safety device. When the valve core of the three-way reversing lock-up valve 260 rotates, it can simultaneously cut off the connection between the air outlet 155, the air supply pipe 157, and the air vent pipe 151. At this time, the air pump 153 cannot pump air, restricting the movement of the lever 330. The lifting airbag 150 also cannot deflate, restricting the movement of the piston plate 140. This prevents the piston rod 230 from falling due to accidental opening of the shut-off valve 120 and the air valve 152, thus avoiding the vehicle falling. The valve core of the three-way reversing lock-up valve 260 must be rotated first to connect the air outlet 155, the air supply pipe 157, and the air vent pipe 151 to achieve pressure relief, significantly improving the safety of equipment use.

[0021] Example 6 differs from Example 1 only in that, in order to extend the life of the lifting airbag 150 and avoid problems such as interference, the lifting airbag 150 is equipped with a safety unloading valve 270. When the internal air pressure of the lifting airbag 150 is too high, the safety unloading valve 270 can release the internal pressure to prevent the lifting airbag 150 from bursting or being crushed, thus playing a protective role.

[0022] Example 7 differs from Example 1 only in that, to limit the rising height of the piston rod 230, the lower end of the piston rod 230 is provided with an end hole 231, and a height-limiting pipe 232 is slidably and sealingly connected within the end hole 231. A height-limiting hole 233 is provided on the upper side wall of the height-limiting pipe 232, and the lower end of the height-limiting pipe 232 is fixed and communicates with the interior of the oil storage tank 100. When the piston rod 230 rises to its highest point, the height-limiting hole 233 on the height-limiting pipe 232 protrudes from the lower end of the end hole 231, allowing hydraulic oil in the cylinder 250 to flow into the height-limiting pipe 232 through the height-limiting hole 233, and then flow back into the oil storage tank 100. When the piston rod 230 moves downward, the height-limiting hole 233 retracts into the end hole 231, thus achieving the height-limiting function of the piston rod 230. In addition, the height-limiting pipe 232 can also have certain oil storage, positioning, and damping functions.

[0023] The technical solutions of the above embodiments are highly compatible and can be freely combined or merged to derive more embodiments and develop products with different functional packages.

[0024] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art will understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. An automobile repair lifting device, comprising an oil tank (100), an oil cylinder (200) and an oil pump (300), an oil suction pipeline (210) is arranged between the input end of the oil pump (300) and the oil tank (100), a first one-way valve (310) is arranged on the oil suction pipeline (210), an oil discharge pipeline (220) is arranged between the output end of the oil pump (300) and the oil cylinder (200), a second one-way valve (320) is arranged on the oil discharge pipeline (220), a return pipeline (110) is arranged between the oil cylinder (200) and the oil tank (100), a stop valve (120) is arranged on the return pipeline (110), the oil pump (300) comprises a lever (330), a pump body (340) and a plunger (350), the lever (330) is rotationally connected with the pump body (340), the pump body (340) and the plunger (350) are slidingly connected, a lifting transmission mechanism (360) is arranged between the upper end of the plunger (350) and the lever (330), characterized in that: The upper end of the oil storage tank (100) is fixedly provided with an end cover (130), a piston plate (140) is slidably arranged in the oil storage tank (100), a lifting air bag (150) is arranged between the piston plate (140) and the end cover (130), a gas discharge pipeline (151) is arranged on the lifting air bag (150), a gas valve (152) is arranged on the gas discharge pipeline (151), the oil cylinder (200) comprises a piston rod (230), a piston body (240) and a cylinder body (250), the end cover (130) is rotatably provided with a fixed pulley (131), a pull rope (132) is arranged on the fixed pulley (131), the pull rope (132) is fixedly connected to the piston plate (140) and the piston body (240) at two ends respectively, a pressing air pump (153) is fixedly arranged on the lower side of the lever (330), the pressing air pump (153) is provided with an air inlet (154) and an air outlet (155), the air inlet (154) is provided with a third one-way valve (156), a gas supply pipeline (157) is arranged between the air outlet (155) and the lifting air bag (150), and the gas supply pipeline (157) is provided with a fourth one-way valve (158).

2. The lifting device for vehicle repair according to claim 1, characterized in that: The stop valve (120) comprises a valve body (121), a valve seat (122) and a reset bolt (123), the valve seat (122) is arranged in the return pipeline (110), the inner end of the reset bolt (123) is in sealing cooperation with the valve seat (122), the reset bolt (123) is threadedly connected with the valve body (121), the gas discharge pipeline (151) is provided with a gas discharge port (159), and the gas valve (152) is a plug, the outer end of the plug is rotatably connected with the outer end of the reset bolt (123).

3. The lifting device for vehicle repair according to claim 1, characterized in that: The cylinder body (250) is located in the interior of the oil storage tank (100), the piston plate (140) has an annular structure, the inner hole of the piston plate (140) is in sliding sealing connection with the outer wall of the cylinder body (250), the end cover (130) is in sliding connection with the piston rod (230), and at least two groups of fixed pulleys (131) are circumferentially arranged on the end cover (130).

4. The lifting device for vehicle repair according to claim 1, characterized in that: The lifting transmission mechanism (360) comprises a driving gear (361) and a driven rack (362), the lever (330) is fixedly connected with the driving gear (361), the driving gear (361) is in meshing connection with the driven rack (362), and the driven rack (362) is fixedly connected with the plunger (350).

5. The lifting device for vehicle repair according to claim 1, characterized in that: The fourth one-way valve (158) is arranged on the air outlet (155), and the gas supply pipeline (157) and the gas discharge pipeline (151) are in communication and provided with a three-way reversing lock valve (260).

6. The lifting device for vehicle repair of claim 1, wherein: The lifting air bag (150) is provided with a safety unloading valve (270).

7. The lifting device for vehicle repair of claim 1, wherein: The lower end of the piston rod (230) is provided with an end hole (231), a height limiting pipe (232) is slidably arranged in the end hole (231), a height limiting hole (233) is arranged on the upper end side wall of the height limiting pipe (232), and the lower end of the height limiting pipe (232) is fixedly connected with the interior of the oil storage tank (100).

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