Hydraulic post extractor

Abstract

The utility model discloses a hydraulic pressure pull column device relates to hydraulic pressure pull column technical field, the utility model discloses a two base still includes side plate, hydraulic cylinder, fixture mounting ring, oil tank, pressurization drive component and cleaning lubrication component, two side plates symmetrical fixed mounting in two base both ends, two hydraulic cylinders are fixed mounting in the top of two base through the support seat symmetry, two oil tanks are fixed mounting respectively in the outside of two hydraulic cylinders, and the fixture mounting ring fixed mounting is between two hydraulic cylinders, and the outside of fixture mounting ring near the bottom end is fixed mounting with two connecting plates symmetry, and the cleaning lubrication component sets up in the outside of hydraulic cylinder near piston rod, can clean and lubricate the piston rod of hydraulic cylinder through setting up cleaning lubrication component, avoids the fine concrete dust, silt and attach on the piston rod surface, prevents the dust with piston rod retraction and scratch the surface, destroys the oil seal, and further avoids the hydraulic oil leakage and the early damage of hydraulic cylinder.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic column pulling technology, specifically to a hydraulic column pulling device. Background Technology

[0002] In engineering fields such as building construction and mining, hydraulic column removal devices are widely used as efficient column removal equipment in various column removal operations, providing an important guarantee for the smooth progress of engineering construction.

[0003] In the actual use of hydraulic column pulling devices, the working environment is often quite harsh, with a large amount of fine concrete dust and silt in the surrounding area. These fine concrete dust and silt are ubiquitous and will adhere to the piston rod of the hydraulic cylinder. When the cylinder extends or retracts, the dust will act like an abrasive, scratching the smooth surface of the piston rod, damaging the oil seal, and ultimately leading to hydraulic oil leakage and premature damage to the cylinder. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a hydraulic cylinder piston rod removal device, which has the advantage of cleaning and lubricating the hydraulic cylinder piston rod. This solves the problems of fine concrete dust and silt adhering to the piston rod, scratching the piston rod surface as the cylinder extends and retracts, damaging the oil seal, and thus causing hydraulic oil leakage and premature cylinder damage.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a hydraulic column pulling device, comprising two bases, side plates, hydraulic cylinders, clamp mounting rings, oil tanks, pressurizing drive components, and cleaning and lubrication components. The two side plates are symmetrically fixedly installed at both ends of the two bases. The two hydraulic cylinders are symmetrically fixedly installed at the top of the two bases via support seats. The two oil tanks are respectively fixedly installed on the outer sides of the two hydraulic cylinders. The clamp mounting ring is fixedly installed between the two hydraulic cylinders. Two connecting plates are symmetrically fixedly installed on the outer side of the clamp mounting ring near the bottom end. The two pressurizing drive components are respectively disposed on the side of the two side plates near the hydraulic cylinders. The pressurizing drive components are connected to the oil tanks via rubber delivery pipes. A one-way valve mechanism is provided inside the rubber delivery pipe near the oil tank end. The cleaning and lubrication components are disposed on the outer side of the hydraulic cylinders near their piston rods. The cleaning and lubrication components are connected to the oil tanks via connecting pipes.

[0006] As a preferred technical solution of this utility model, the pressurization drive assembly includes an air pipe, which is fixedly installed on the side of the side plate near the hydraulic cylinder. A sliding groove is opened on the outer side of one end of the air pipe near the connecting plate. A gas outlet pipe is fixedly installed on the other end of the air pipe. The outer side of the gas outlet pipe is fixedly installed with one end of the rubber conveying pipe. A limit rod is fixedly installed axially on the outer side of the air pipe near the sliding groove.

[0007] As a preferred technical solution of this utility model, the pressurization drive assembly further includes a piston plate, which is movably sleeved inside the gas pipe. A rubber cup is fixedly installed on the side of the piston plate near the gas outlet pipe, and an L-shaped rod is fixedly installed on the other side of the piston plate. The other end of the L-shaped rod passes through a sliding groove.

[0008] As a preferred technical solution of this utility model, the pressure driving assembly further includes a connecting rod, which is rotatably installed at one end of the L-shaped rod passing through the slide groove, and the other end of the connecting rod is rotatably installed on one side of the connecting plate. A protective cover plate is fixedly installed on the side of the L-shaped rod near the slide groove, and a limiting groove is opened at the bottom of the protective cover plate. The limiting rod is movably sleeved inside the limiting groove, and a semi-circular support block is fixedly installed at the bottom of the end of the L-shaped rod near the connecting rod.

[0009] As a preferred embodiment of this utility model, the one-way valve mechanism includes a cross bracket, which is fixedly installed inside the rubber delivery pipe near the oil tank. A spring is fixedly installed on one side of the cross bracket, and the other end of the spring is fixedly installed on a rubber sealing plate. The rubber sealing plate is located at the end of the rubber delivery pipe near the oil tank.

[0010] As a preferred technical solution of this utility model, the cleaning and lubrication assembly includes an annular oil reservoir pipe, which is fixedly installed on the outside of the hydraulic cylinder near its piston rod. The oil tank is connected to one end of the annular oil reservoir pipe through a connecting pipe. Several oil delivery pipes are fixedly installed at equal intervals along the circumference at the bottom of the annular oil reservoir pipe.

[0011] As a preferred embodiment of this utility model, the cleaning and lubrication assembly further includes a fixing ring, which is fixedly installed between several oil supply pipes. The bottom ends of the several oil supply pipes pass through the fixing ring, and an annular sponge brush is fixedly installed on the inner wall of the fixing ring.

[0012] As a preferred technical solution of this utility model, the cleaning and lubrication assembly further includes several support rods, which are fixedly installed at equal intervals along the circumference at the bottom of the annular oil reservoir. The support rods are relatively long, and an annular rubber scraper is fixedly installed at the bottom end of the support rods. The annular rubber scraper is located below the fixed ring.

[0013] The beneficial effects of this utility model are as follows: This invention achieves effective cleaning and lubrication of the hydraulic cylinder piston rod through a cleaning and lubrication assembly. The annular oil storage pipe is connected to the oil tank through a connecting pipe, and several oil delivery pipes at the bottom evenly deliver the lubricating oil. The annular sponge brush on the inner wall of the fixed ring can absorb the lubricating oil and wipe the piston rod to achieve lubrication. At the same time, the annular rubber scraper below can first scrape off the fine concrete dust and mud on the surface of the piston rod.

[0014] With the cooperation of the pressurized drive component and the one-way valve mechanism, when the hydraulic cylinder drives the clamp mounting ring to move, the connecting plate moves accordingly. Through the connecting rod and L-shaped rod, the piston plate is pushed to reciprocate in the air pipe, which pressurizes the gas into the oil tank through the rubber delivery pipe, so that the lubricating oil can smoothly enter the annular oil storage pipe through the connecting pipe, ensuring the normal operation of the cleaning and lubrication components. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a hydraulic column pulling device according to this utility model; Figure 2 This is a schematic diagram of the side plate structure of this utility model; Figure 3 This is an exploded structural diagram of the pressurization drive component of this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the pressure drive component of this utility model; Figure 5 This is a schematic diagram of the cross-sectional structure of the rubber conveying pipe of this utility model; Figure 6 This is an enlarged structural schematic diagram of utility model A; Figure 7 This is a schematic diagram of the hydraulic cylinder structure of this utility model; Figure 8 This is an exploded structural diagram of the cleaning and lubrication assembly of this utility model; Figure 9 This is a schematic diagram of the cross-sectional structure of the cleaning and lubrication component of this utility model.

[0016] Reference numerals: 1. Base; 2. Side plate; 3. Hydraulic cylinder; 4. Clamp mounting ring; 5. Oil tank; 6. Rubber delivery pipe; 7. Connecting plate; 8. Air pipe; 9. Slide groove; 10. Piston plate; 11. Rubber cup; 12. L-shaped rod; 13. Connecting rod; 14. Semi-circular support block; 15. Cross bracket; 16. Spring; 17. Rubber sealing plate; 18. Annular oil storage pipe; 19. Oil delivery pipe; 20. Fixing ring; 21. Annular sponge brush; 22. Support rod; 23. Annular rubber scraper. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention may exceed the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but they still fall within the protection scope of this application.

[0018] Figures 1-9 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figure 1 -Appendix Figure 9 The present invention will be further described below.

[0019] A hydraulic column pulling device includes two bases 1, side plates 2, hydraulic cylinders 3, clamp mounting rings 4, oil tanks 5, pressurizing drive components, and cleaning and lubrication components. The two side plates 2 are symmetrically fixed at both ends of the two bases 1. The two hydraulic cylinders 3 are symmetrically fixed at the top of the two bases 1 via support seats. The two oil tanks 5 are respectively fixed on the outside of the two hydraulic cylinders 3. The clamp mounting ring 4 is fixed between the two hydraulic cylinders 3. Two connecting plates 7 are symmetrically fixed on the outside of the clamp mounting ring 4 near the bottom end. The two pressurizing drive components are respectively located on the side of the two side plates 2 near the hydraulic cylinders 3. The pressurizing drive components are connected to the oil tanks 5 via rubber delivery pipes 6. A one-way valve mechanism is provided inside the rubber delivery pipe 6 near the oil tank 5. The cleaning and lubrication components are located on the outside of the hydraulic cylinders 3 near their piston rods. The cleaning and lubrication components are connected to the oil tanks 5 via connecting pipes.

[0020] In this embodiment, the base 1 serves as the fundamental support component for the entire hydraulic column pulling device, providing a symmetrical and fixed mounting position for the side plate 2. Simultaneously, the support base provides a stable top mounting foundation for the hydraulic cylinder 3. The side plate 2 is used to fix and mount the pressure drive assembly, providing a stable lateral mounting carrier for it. The hydraulic cylinder 3 provides mounting support for the clamp mounting ring 4, ensuring its stable position between the two hydraulic cylinders 3. Furthermore, as a power component, it drives the clamp mounting ring 4 to move, which in turn, via the connecting plate 7 on the outer side of the clamp mounting ring 4, links the operation of the pressure drive assembly. The core function of the clamp mounting ring 4 is to fix the column to be pulled, ensuring it does not fall off or shift during the pulling process. The connecting plate 7, symmetrically mounted near its bottom outer side, transmits the power of the hydraulic cylinder 3 to the connecting rod 13 in the pressure drive assembly. The oil tank 5 stores lubricating oil and has an oil filling hole at the top. The internal thread of the oil filling hole is connected to a sealing bolt. The rubber delivery pipe 6 is connected to the pressurizing drive assembly and receives the gas delivered by the pressurizing drive assembly, creating air pressure in the oil tank 5. This air pressure can push the internal lubricating oil through the connecting pipe into the cleaning and lubrication assembly. The rubber delivery pipe 6 can stably deliver the compressed gas generated by the pressurizing drive assembly to the oil tank 5. At the same time, a one-way valve mechanism is installed inside the rubber delivery pipe 6 near the oil tank 5, which can work with the one-way valve mechanism to achieve one-way gas delivery and prevent gas backflow. The pressurizing drive assembly is fixedly installed with the side plate 2 and linked with the connecting plate 7. It can generate compressed gas under the drive of the connecting plate 7 and deliver the compressed gas to the oil tank 5 through the rubber delivery pipe 6 to provide air pressure in the oil tank 5. The cleaning and lubrication assembly is connected to the oil tank 5 through the connecting pipe and can receive the lubricating oil delivered by the oil tank 5. It can clean and lubricate the piston rod of the hydraulic cylinder 3, preventing fine concrete dust and mud from adhering to the piston rod surface, preventing dust from scratching the surface and damaging the oil seal as the piston rod extends and retracts, thereby preventing hydraulic oil leakage and premature damage to the hydraulic cylinder 3.

[0021] Specifically, the pressurization drive assembly includes an air pipe 8, which is fixedly installed on the side plate 2 near the hydraulic cylinder 3. A groove 9 is provided on the outer side of one end of the air pipe 8 near the connecting plate 7. A gas outlet pipe is fixedly installed on the other end of the air pipe 8. The outer side of the gas outlet pipe is fixedly installed with one end of the rubber delivery pipe 6. A limit rod is fixedly installed on the outer side of the air pipe 8 near the groove 9 along the axial direction. The pressurization drive assembly also includes a piston plate 10, which is movably sleeved inside the air pipe 8. A rubber cup 11 is fixedly installed on the side of the piston plate 10 near the gas outlet pipe, and an L-shaped rod 12 is fixedly installed on the other side of the piston plate 10. The other end of the L-shaped rod 12 passes through the slide groove 9. The pressurization drive assembly also includes a connecting rod 13, which is rotatably mounted at one end of the L-shaped rod 12 that passes through the slide groove 9. The other end of the connecting rod 13 is rotatably mounted to one side of the connecting plate 7. A protective cover plate is fixedly mounted on the side of the L-shaped rod 12 near the slide groove 9. A limit groove is opened at the bottom of the protective cover plate, and a limit rod is movably sleeved inside the limit groove. A semi-circular support block 14 is fixedly mounted at the bottom of the end of the L-shaped rod 12 near the connecting rod 13.

[0022] In this embodiment, by providing a closed reciprocating motion space for the piston plate 10 through the air pipe 8, and connecting the other end to the rubber delivery pipe 6 through the gas outlet pipe, the pressurized gas of the piston plate 10 can be stably introduced into the rubber delivery pipe 6 and finally delivered to the oil tank 5. The slide groove 9 is opened on the outer side of the air pipe 8 near the connecting plate 7, for the L-shaped rod 12 to pass through and move with the piston plate 10, limiting the L-shaped rod 12 to move only along the axial direction of the air pipe 8, avoiding the piston plate 10 from being stuck in the air pipe 8 due to the L-shaped rod 12 deviating. The limiting rod is fixed axially on the outer side of the air pipe 8 near the slide groove 9, and is movably sleeved in the limiting groove of the protective cover plate, providing motion guidance for the protective cover plate. The piston plate 10 is movably sleeved inside the air pipe 8, receiving the power transmitted by the connecting rod 13 on one side through the L-shaped rod 12, and can reciprocate in the air pipe 8, compressing the gas in the air pipe 8 to form compressed gas. The rubber cup 11 fixed on the other side can enhance its tightness with the inner wall of the air pipe 8. The sealing mechanism ensures that the piston plate 10 can effectively compress the gas when it moves, preventing gas leakage and pressurization failure. When the piston plate 10 moves towards the gas outlet pipe, the rubber cup 11 is compressed by the gas and pressed tightly against the inner wall of the air pipe 8, preventing the gas from flowing back from the gap between the piston plate 10 and the inner wall of the air pipe 8. When the piston plate 10 moves in the opposite direction, the edge of the rubber cup 11 is slightly raised, allowing external gas to enter the air pipe 8, ensuring that the piston plate 10 can continuously generate compressed gas when it reciprocates. The L-shaped rod 12 can transmit the power received by the connecting rod 13 from the connecting plate 7 to the piston plate 10, driving the piston plate 10 to reciprocate in the air pipe 8. The protective cover can block the opening of the slide groove 9 to prevent external concrete dust and mud from entering the air pipe 8, avoiding dust affecting the movement of the piston plate 10 or damaging the rubber cup 11. The semi-circular support block 14 provides support for the end of the L-shaped rod 12 near the connecting plate 7, allowing the L-shaped rod 12 to slide smoothly inside the air pipe 8.

[0023] Specifically, the one-way valve mechanism includes a cross bracket 15, which is fixedly installed inside the rubber delivery pipe 6 near the oil tank 5. A spring 16 is fixedly installed on one side of the cross bracket 15, and the other end of the spring 16 is fixedly installed on a rubber sealing plate 17. The rubber sealing plate 17 is located at the end of the rubber delivery pipe 6 near the oil tank 5.

[0024] In this embodiment, by fixing the cross bracket 15 inside the rubber delivery pipe 6 near the oil tank 5, a stable mounting base is provided for the spring 16, ensuring that the spring 16 can maintain a fixed posture and apply traction force to the rubber sealing plate 17. One end of the spring 16 is fixed to the cross bracket 15, and the other end is fixed to the rubber sealing plate 17. Under normal conditions, it will apply a pulling force to the rubber sealing plate 17 towards the end of the rubber delivery pipe 6 near the oil tank 5, so that the rubber sealing plate 17 fits tightly against the end of the rubber delivery pipe 6, blocking the reverse channel between the rubber delivery pipe 6 and the oil tank 5. When the pressurized drive assembly delivers gas to the oil tank 5 through the rubber delivery pipe 6, the gas pressure will overcome the traction force of the spring 16 and push the rubber sealing plate 17 away from the cross bracket 15, opening the channel between the rubber delivery pipe 6 and the oil tank 5, realizing unidirectional gas delivery. After the gas delivery is completed, the spring 16 will push the rubber sealing plate 17 to reset again, re-close the channel, and prevent the gas in the oil tank 5 from flowing back into the rubber delivery pipe 6.

[0025] Specifically, the cleaning and lubrication assembly includes an annular oil reservoir 18, which is fixedly installed on the outside of the hydraulic cylinder 3 near its piston rod. The oil tank 5 is connected to one end of the annular oil reservoir 18 through a connecting pipe. Several oil delivery pipes 19 are fixedly installed at equal intervals along the circumference at the bottom of the annular oil reservoir 18. The cleaning and lubrication assembly also includes a retaining ring 20, which is fixedly installed between a plurality of oil supply pipes 19. The bottom ends of the plurality of oil supply pipes 19 pass through the retaining ring 20, and an annular sponge brush 21 is fixedly installed on the inner wall of the retaining ring 20. The cleaning and lubrication assembly also includes several support rods 22, which are fixedly installed at equal intervals along the circumference at the bottom of the annular oil reservoir 18. The support rods 22 are relatively long, and annular rubber scrapers 23 are fixedly installed at the bottom ends of the support rods 22. The annular rubber scrapers 23 are located below the fixing ring 20.

[0026] In this embodiment, the annular oil reservoir 18 is fixedly installed on the outside of the hydraulic cylinder 3 near its piston rod and connected to the oil tank 5 via a connecting pipe. It receives and temporarily stores the lubricating oil supplied by the oil tank 5. Several oil delivery pipes 19, evenly spaced along the circumference at its bottom, evenly distribute the stored lubricating oil to each pipe, ensuring stable and uniform delivery of the lubricating oil to the annular sponge brush 21. This provides a continuous and uniform oil source for subsequent piston rod lubrication. A fixing ring 20 is fixed to the bottom of the annular oil reservoir 18, with its bottom end penetrating the fixing ring 20. This allows for precise delivery of the lubricating oil from the annular oil reservoir 18 to the annular sponge brush 21 on the inner wall of the fixing ring 20. The evenly spaced oil delivery pipes 19 ensure that the lubricating oil penetrates evenly to all parts of the annular sponge brush 21, preventing uneven lubrication of the hydraulic cylinder 3 piston rod due to localized oil shortages in the annular sponge brush 21, thereby preventing piston... The rod wears due to insufficient lubrication in some areas. The support rod 22 is fixed at equal intervals along the circumference at the bottom of the annular oil reservoir 18 and is set to be relatively long. It can fix the annular rubber scraper 23 at a designated position below the fixing ring 20. With the support of the support rod 22, it is ensured that the annular rubber scraper 23 and the piston rod of the hydraulic cylinder 3 maintain a suitable fit. It will not fail to scrape dust due to excessive spacing, nor will it affect the extension and retraction of the piston rod due to excessive tightness. When the piston rod of the hydraulic cylinder 3 extends and retracts, the annular rubber scraper 23 can contact the piston rod surface before the annular sponge brush 21, scraping off the fine concrete dust and mud adhering to the piston rod. Its rubber material is soft and has a certain degree of elasticity. It can effectively remove dust without scratching the piston rod surface. It prevents dust from entering the hydraulic cylinder 3 with the extension and retraction of the piston rod, scratching the smooth surface of the piston rod, and damaging the oil seal, thereby preventing hydraulic oil leakage and premature damage to the hydraulic cylinder 3.

[0027] In summary: When this utility model is in use, the hydraulic cylinder 3 is activated, and the piston rod of the hydraulic cylinder 3 extends and retracts, causing the clamp mounting ring 4 to move downwards. This, in turn, causes the connecting plate 7 on the outer side of the clamp mounting ring 4 to move downwards synchronously. When the connecting plate 7 moves, it pushes the connecting rod 13 to move. The connecting rod 13 drives the L-shaped rod 12 to slide along the groove 9 on the outer side of the air pipe 8. The L-shaped rod 12 pushes the piston plate 10 to move towards the gas outlet pipe within the air pipe 8. The rubber cup 11 enables the piston plate 10 to effectively compress the gas in the air pipe 8 to form compressed gas. The compressed gas enters the rubber delivery pipe 6 through the gas outlet pipe. The one-way valve mechanism inside the rubber delivery pipe 6... In the process, the gas pressure overcomes the traction force of the spring 16 and pushes the rubber sealing plate 17 to move, opening the channel to send gas into the oil tank 5. After the gas delivery is completed, the spring 16 pulls the rubber sealing plate 17 to reset and prevent gas backflow. The gas pressure in the oil tank 5 increases and pushes the lubricating oil into the annular oil storage pipe 18 through the connecting pipe. The annular oil storage pipe 18 delivers the lubricating oil to the annular sponge brush 21 through the oil delivery pipe 19. At the same time, when the piston rod of the hydraulic cylinder 3 moves downward and retracts, the annular rubber scraper 23 first scrapes off the dust and mud on the surface of the piston rod, and then the annular sponge brush 21 lubricates the piston rod, finally achieving the cleaning and smoothing of the piston rod of the hydraulic cylinder 3.

[0028] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A hydraulic column pulling device, comprising two bases (1), characterized in that, It also includes side plates (2), hydraulic cylinders (3), clamp mounting rings (4), oil tanks (5), pressurization drive components and cleaning and lubrication components. The two side plates (2) are symmetrically fixed at both ends of the two bases (1). The two hydraulic cylinders (3) are symmetrically fixed at the top of the two bases (1) through support seats. The two oil tanks (5) are respectively fixed on the outside of the two hydraulic cylinders (3). The clamp mounting ring (4) is fixedly installed between the two hydraulic cylinders (3). Two connecting plates (7) are symmetrically fixed on the outside of the clamp mounting ring (4) near the bottom end. The two pressurization drive components are respectively set on the side of the two side plates (2) near the hydraulic cylinders (3). The pressurization drive components are connected to the oil tanks (5) through rubber delivery pipes (6). A one-way valve mechanism is set inside the rubber delivery pipe (6) near the oil tank (5). The cleaning and lubrication components are set on the outside of the hydraulic cylinders (3) near their piston rods. The cleaning and lubrication components are connected to the oil tanks (5) through connecting pipes.

2. The hydraulic column pulling device according to claim 1, characterized in that, The pressurization drive assembly includes an air pipe (8), which is fixedly installed on the side plate (2) near the hydraulic cylinder (3). A groove (9) is provided on the outer side of one end of the air pipe (8) near the connecting plate (7). A gas outlet pipe is fixedly installed on the other end of the air pipe (8). The outer side of the gas outlet pipe is fixedly installed with one end of the rubber delivery pipe (6). A limit rod is fixedly installed on the outer side of the air pipe (8) near the groove (9) along the axial direction.

3. The hydraulic column pulling device according to claim 2, characterized in that, The pressurization drive assembly also includes a piston plate (10), which is movably sleeved inside the gas pipe (8). A rubber cup (11) is fixedly installed on the side of the piston plate (10) near the gas outlet pipe, and an L-shaped rod (12) is fixedly installed on the other side of the piston plate (10). The other end of the L-shaped rod (12) passes through the slide groove (9).

4. A hydraulic column pulling device according to claim 3, characterized in that, The pressurization drive assembly also includes a connecting rod (13), which is rotatably mounted on one end of the L-shaped rod (12) that passes through the slide groove (9). The other end of the connecting rod (13) is rotatably mounted on one side of the connecting plate (7). A protective cover plate is fixedly mounted on the side of the L-shaped rod (12) near the slide groove (9). A limit groove is opened at the bottom of the protective cover plate. The limit rod is movably sleeved inside the limit groove. A semi-circular support block (14) is fixedly mounted at the bottom of the end of the L-shaped rod (12) near the connecting rod (13).

5. A hydraulic column pulling device according to claim 1, characterized in that, The one-way valve mechanism includes a cross bracket (15), which is fixedly installed inside the rubber delivery pipe (6) near the oil tank (5). A spring (16) is fixedly installed on one side of the cross bracket (15), and the other end of the spring (16) is fixedly installed on a rubber sealing plate (17). The rubber sealing plate (17) is located at the end of the rubber delivery pipe (6) near the oil tank (5).

6. A hydraulic column pulling device according to claim 5, characterized in that, The cleaning and lubrication assembly includes an annular oil reservoir (18), which is fixedly installed on the outside of the hydraulic cylinder (3) near its piston rod. The oil tank (5) is connected to one end of the annular oil reservoir (18) through a connecting pipe. Several oil delivery pipes (19) are fixedly installed at equal intervals along the circumference at the bottom of the annular oil reservoir (18).

7. A hydraulic column pulling device according to claim 6, characterized in that, The cleaning and lubrication assembly also includes a retaining ring (20), which is fixedly installed between a plurality of oil pipes (19). The bottom ends of the plurality of oil pipes (19) pass through the retaining ring (20), and an annular sponge brush (21) is fixedly installed on the inner wall of the retaining ring (20).

8. A hydraulic column pulling device according to claim 7, characterized in that, The cleaning and lubrication assembly also includes several support rods (22), which are fixedly installed at equal intervals along the circumference at the bottom of the annular oil reservoir (18). The support rods (22) are relatively long, and an annular rubber scraper (23) is fixedly installed at the bottom end of the support rods (22). The annular rubber scraper (23) is located below the fixing ring (20).

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