A self-lubricating vertical jack

Abstract

This invention proposes a self-lubricating vertical jack, aiming to solve the problems of insufficient lubrication, uneven lifting, and short service life of existing jack devices. It comprises a hydraulic cylinder, base, and pressure rod. The piston rod is covered with a lubricating coating, and the outer wall of the piston has a wedge-shaped groove filled with grease, which, together with the oil reservoir on the piston rod, achieves self-lubrication. Simultaneously, a limiting sleeve and a sealing ring enhance sealing and prevent leakage. A return valve and a safety stop valve on the base ensure operational safety. Through the synergistic effect of the lubricating coating, wedge-shaped groove grease, and oil reservoir, friction is reduced, extending the equipment's lifespan. The sealing structure effectively prevents hydraulic oil leakage, ensuring stable operation. The safety valve provides dual protection, improving operational safety. This invention is easy to operate, has low maintenance costs, and combines practicality and sealing, making it suitable for lifting operations in various scenarios.

Description

Technical Field

[0001] This utility model relates to the field of jack technology, and in particular to a self-lubricating vertical jack. Background Technology

[0002] Vertical jacks are hydraulic jacks that operate based on Pascal's law. They use a small piston to transfer the pressure of oil to a large piston, thereby lifting heavy objects. They are characterized by simple structure, convenient operation, small size, and light weight. They are widely used in lifting operations in factories, warehouses, bridges, docks, transportation, and construction projects, as well as in repairing cars, tractors, and other objects that need to be lifted.

[0003] The utility model patent with authorization announcement number CN204417013U discloses a "self-lubricating jack", including a hydraulic cylinder body, a piston disposed inside the hydraulic cylinder body, and a piston rod disposed on the piston. The hydraulic cylinder body includes a base, a cylinder wall, and a cylinder head. The inner surface of the cylinder wall has a polytetrafluoroethylene (PTFE) lubricating coating. The piston and cylinder wall are slidably connected. The outer surface of the piston rod has a PTFE lubricating coating. The piston rod and cylinder head are slidably connected. The bottom of the base has a groove. This utility model has a simple and reasonable structure and self-lubricating properties, and is less affected by the lubrication properties of oil. However, the lubrication of this utility model is insufficient. The PTFE lubricating coating alone is not enough to maintain the lubrication effect for a long time. It is easy to cause component wear due to untimely maintenance, and excessively long maintenance intervals may lead to accelerated equipment wear and increase the risk of equipment failure.

[0004] To improve lubrication, utility model patent CN203820364U discloses a "jack" comprising a first cylinder liner, a first piston, a second cylinder liner, a second piston, a lead screw, and an end cap. The first piston is housed inside the first cylinder liner; the second piston is installed inside the second cylinder liner; one end of the second cylinder liner is fixedly connected to the side of the first cylinder liner; an end cap is fixedly installed at the end of the second cylinder liner, and the lead screw is threadedly connected to the end cap, with one end located inside the second cylinder liner and fixedly connected to the second piston; a cavity A is formed between the bottom end of the first piston and the end cap of the first cylinder liner; the end of the second piston... A cavity B is formed between the cylinder liner and the side wall of the first cylinder liner. Cavities A and B are connected by a flow channel opened on the side wall of the first cylinder liner. The cavity is filled with grease. Rotating the lead screw can realize the piston movement of the second piston in the second cylinder liner, and then realize the movement of the first piston through the grease, thus achieving the lifting function of the jack. This utility model is easy to disassemble, inexpensive, has low maintenance cost, is lightweight, and easy to carry, making it the first choice for on-site construction. However, the first and second pistons of this utility model are exposed, which may accelerate the wear of the piston and the inner wall of the cylinder, shortening the service life of the equipment.

[0005] In summary, existing jack devices typically have the following drawbacks: 1) Insufficient lubrication: Some existing jack devices lack lubrication structures or rely on manual lubrication for regular application, which is cumbersome and prone to wear and tear due to untimely maintenance. Lubrication requires machine shutdown, affecting work efficiency. Furthermore, uneven application of lubricant or excessively long maintenance intervals may lead to accelerated wear and tear on the equipment, increasing the risk of equipment failure. 2) Unsmooth lifting: The hydraulic telescopic rod structure of traditional vertical jacks is exposed, making it easy for external dust, fine particles and moisture to adhere to the surface of the hydraulic rod during actual use. This increases the friction between the hydraulic rod and the inner wall of the cylinder, resulting in unsmooth lifting of the equipment. Short service life: Some existing jack devices have exposed hydraulic telescopic rod structures, which may accelerate the wear of the hydraulic rod and the inner wall of the cylinder, shortening the service life of the equipment. Summary of the Invention

[0006] The purpose of this invention is to solve the problems in the prior art by proposing a self-lubricating vertical jack that can solve the problems of insufficient lubrication, uneven lifting and lowering, and short service life.

[0007] To achieve the above objectives, this utility model proposes a self-lubricating vertical jack, comprising a hydraulic cylinder, a base, and a pressure rod. The hydraulic cylinder is fixedly mounted on one side of the base, with a nut seat fixedly mounted on the upper end of the hydraulic cylinder. The piston rod is movably disposed inside the hydraulic cylinder, and its outer surface is coated with a lubricating coating. The piston rod passes sequentially through the top of the hydraulic cylinder and the nut seat and extends outward. An adjusting screw is connected to the upper end of the piston rod, and a top head is fixedly mounted on the upper end of the adjusting screw. A piston is coaxially connected to the lower end of the piston rod, and the piston is sealed to the inner wall of the hydraulic cylinder. A pressure rod is fixedly mounted on the other side of the base, and a handle is provided on the outer wall of the hydraulic cylinder.

[0008] Preferably, a wedge-shaped groove is provided at the upper end of the piston outer wall, the wedge-shaped groove is filled with grease, and a piston seal is provided at the lower end of the piston outer wall.

[0009] Preferably, the piston rod has a threaded cavity coaxially inside, the adjusting screw has threads evenly distributed on its outer circumference, the adjusting screw is threadedly connected to the threaded cavity, and the top surface of the mandrel has a cross groove.

[0010] Preferably, the hydraulic cylinder body is provided with a limiting sleeve at one end near the nut seat, the limiting sleeve abuts against the outer wall of the piston rod, a sealing ring is provided between the limiting sleeve and the piston rod, and the lower end of the limiting sleeve is connected to an oil storage tank.

[0011] Preferably, the nut seat further includes a drainage groove, a sealing block, a guide hole, a sealing layer, and a handle. The drainage groove is formed on the upper surface of the nut seat, and the lower end of the drainage groove is connected to the guide hole. The sealing block is embedded in the drainage groove, and the sealing block includes a sealing layer and a handle. The sealing layer covers the lower end of the sealing block, and the handle is installed on the upper end of the sealing block.

[0012] Preferably, the upper end of the guide hole is connected to the flow channel, the guide hole passes through the nut seat and the limiting sleeve in sequence, and the lower end of the guide hole is connected to the oil storage tank.

[0013] Preferably, the base is provided with a return valve and a safety stop valve, and the base is provided with symmetrical reinforcing ribs on both sides of the return valve and the safety stop valve.

[0014] The beneficial effects of this utility model are: 1) Self-lubricating: The lubricating coating on the outer surface of the piston rod, the wedge-shaped groove grease and the oil reservoir, etc., achieve self-lubrication, reduce the friction between the piston rod and the inner wall of the cylinder, extend the service life of the equipment, and avoid the inconvenience and high cost of manual lubrication of traditional jacks. 2) Sealing and leakage prevention: The design of the limit sleeve, sealing ring and oil reservoir enhances the sealing performance of the jack, prevents hydraulic oil leakage, ensures stable operation of the equipment, and prevents the reduction of lifting capacity due to insufficient oil. 3) Operational safety: The safety stop valve and return oil valve on the base provide dual safety protection for the equipment. The stop valve prevents the jack from falling suddenly, and the return oil valve can be turned up clockwise to rise and down counterclockwise to lower, ensuring the equipment can be reset smoothly and significantly improving operational safety and reliability.

[0015] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the hydraulic cylinder body of this utility model; Figure 3 This is a top view of the present invention.

[0017] Numbering in the diagram: 1-Hydraulic cylinder body; 2-Piston rod; 201-Lubricating coating; 202-Threaded cavity; 3-Piston; 301-Piston seal; 302-Wedge groove; 303-Grease; 4-Adjusting screw; 5-Top; 501-Cross groove; 6-Nut seat; 601-Drainage groove; 602-Sealing block; 603-Drainage hole; 604-Sealing layer; 605-Pull handle; 7-Limit sleeve; 701-Sealing ring; 702-Oil reservoir; 8-Base; 801-Return valve; 802-Safety stop valve; 803-Reinforcing rib; 9-Pressure rod; 10-Lifting handle. Detailed Implementation

[0018] Example 1: See Figures 1 to 3 This utility model discloses a self-lubricating vertical jack, comprising a hydraulic cylinder body 1, a base 8, and a pressure rod 9, characterized in that: Figure 1 As shown, a hydraulic cylinder 1 is fixedly installed on one side of the base 8. A nut seat 6 is fixedly provided at the upper end of the hydraulic cylinder 1. The piston rod 2 is movably disposed inside the hydraulic cylinder 1. The outer surface of the piston rod 2 is coated with a lubricating coating 201. The piston rod 2 passes through the top of the hydraulic cylinder 1 and the nut seat 6 in sequence and extends outward. An adjusting screw 4 is connected to the upper end of the piston rod 2. A top head 5 is fixedly provided at the upper end of the adjusting screw 4. A piston 3 is coaxially connected to the lower end of the piston rod 2. The piston 3 is sealed to the inner wall of the hydraulic cylinder 1. A pressure rod 9 is fixedly provided on the other side of the base 8. A handle 10 is provided on the outer wall of the hydraulic cylinder 1.

[0019] like Figure 2 As shown, a wedge-shaped groove 302 is formed on the upper end of the outer wall of the piston 3, and the wedge-shaped groove 302 is filled with grease 303. A piston seal 301 is provided on the lower end of the outer wall of the piston 3. A threaded cavity 202 is coaxially formed inside the piston rod 2. The adjusting screw 4 has threads evenly distributed on its outer circumference, and the adjusting screw 4 is threadedly connected to the threaded cavity 202. Figure 3 As shown, the top surface of the top head 5 is provided with a cross groove 501; the hydraulic cylinder body 1 is provided with a limiting sleeve 7 at one end near the nut seat 6, the limiting sleeve 7 abuts against the outer wall of the piston rod 2, a sealing ring 701 is provided between the limiting sleeve 7 and the piston rod 2, and the lower end of the limiting sleeve 7 is connected to the oil storage tank 702; the nut seat 6 also includes a drainage groove 601, a sealing block 602, a guide hole 603, a sealing layer 604 and a handle 605, the upper surface of the nut seat 6 is provided with a drainage groove 601, the lower end of the drainage groove 601 is connected to the guide hole 603, and the sealing block 602 is embedded in... Inside the drainage channel 601, the sealing block 602 includes a sealing layer 604 and a handle 605. The sealing layer 604 covers the lower end of the sealing block 602, and the handle 605 is installed on the upper end of the sealing block 602. The upper end of the guide hole 603 is connected to the drainage channel 601, and the guide hole 603 passes through the nut seat 6 and the limiting sleeve 7 in sequence. The lower end of the guide hole 603 is connected to the oil storage tank 702. The base 8 is provided with a return oil valve 801 and a safety stop valve 802. The base 8 is symmetrically provided with reinforcing ribs 803 on both sides of the return oil valve 801 and the safety stop valve 802.

[0020] In this embodiment, the outer surface of the piston rod 2 is coated with a polytetrafluoroethylene lubricating coating 201, and a wedge-shaped groove 302 is machined on the upper end of the outer wall of the piston 3 and filled with silicone-based grease 303. The structure is simple, the lubrication is uniform, the friction between the piston rod and the inner wall of the cylinder is effectively reduced, and it is easy to carry.

[0021] Example 2: This embodiment is basically the same as embodiment 1, except that: the wedge-shaped groove 302 at the upper end of the outer wall of piston 3 is changed to a spiral groove and filled with molybdenum-based grease 303; the outer surface of piston rod 2 is coated with ceramic-based composite lubricating coating 201; an auxiliary sealing ring 701 is added at the contact point between the limiting sleeve 7 at the top of hydraulic cylinder 1 and piston rod 2; and the oil reservoir 702 is changed to an annular oil reservoir chamber surrounding the middle section of hydraulic cylinder 1. The spiral groove design enables the grease to form a more uniform oil film when piston 3 moves, and at the same time guides excess grease to flow back to the oil reservoir 702 efficiently.

[0022] Example 3: This embodiment is basically the same as Embodiment 1, except that: the handle 10 on the outer wall of the hydraulic cylinder body 1 is designed as an oil storage chamber, which is connected to the inside of the hydraulic cylinder body 1 through a micro guide tube to realize the automatic oil replenishment function. The surface of the handle 10 adopts an ergonomic grip design and has an embedded high-precision pressure sensor 1002, which can monitor the internal pressure of the jack in real time. The oil storage chamber design of the handle 10 enables the jack to have automatic oil replenishment capability, eliminating the tedious operation of manually adding lubricating oil periodically. It provides real-time pressure feedback to the operator, enhancing the safety and reliability of the operation.

[0023] Working principle: When the jack is in operation, the operator presses hydraulic oil into the hydraulic cylinder 1 through the pressure rod 9, pushing the piston 3 upward, which in turn drives the piston rod 2 and the jack head 5 to lift the heavy object. When the heavy object needs to be lifted to a higher height, the adjusting screw 4 can be manually turned to raise or lower it. The lubricating coating 201 on the surface of the piston rod 2 and the grease 303 in the wedge groove 302 on the outer wall of the piston 3 reduce friction, while the sealing structure such as the piston seal 301 and the sealing ring 701 prevents hydraulic oil leakage. The handle 10 on the outside of the hydraulic cylinder 1 makes it easy to carry. The drainage groove 601 and the guide hole 6 on the nut seat 6 are also included. 03 The lubricating oil is transferred to the oil reservoir 702, thereby lubricating the contact area of ​​the piston rod 2. The sealing block 602 and the sealing layer 604 enhance the sealing effect. The threaded cavity 202 inside the piston rod 2 is threadedly connected to the adjusting screw 4. Rotating the adjusting screw can adjust the height of the top head 5. The cross groove 501 of the top head 5 is adapted to the tool and increases the friction force. The limit sleeve 7 restricts the movement range of the piston rod 2. The safety stop valve 802 and the return oil valve 801 ensure the stability and safety of the system. The return oil valve is turned clockwise to rise and counterclockwise to fall. The reinforcing rib 803 enhances the structural strength of the base 8.

[0024] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A self-lubricating vertical jack, comprising a hydraulic cylinder (1), a base (8), and a pressure rod (9), characterized in that: A hydraulic cylinder (1) is fixedly installed on one side of the base (8). A nut seat (6) is fixedly provided at the upper end of the hydraulic cylinder (1). A piston rod (2) is movably disposed inside the hydraulic cylinder (1). A lubricating coating (201) is applied to the outer surface of the piston rod (2). The piston rod (2) passes through the top of the hydraulic cylinder (1) and the nut seat (6) in sequence and extends outward. An adjusting screw (4) is connected to the upper end of the piston rod (2). A top head (5) is fixedly provided at the upper end of the adjusting screw (4). A piston (3) is coaxially connected to the lower end of the piston rod (2). The piston (3) is sealed to the inner wall of the hydraulic cylinder (1). A pressure rod (9) is fixedly provided on the other side of the base (8). A handle (10) is provided on the outer wall of the hydraulic cylinder (1).

2. The self-lubricating vertical jack as described in claim 1, characterized in that: The piston (3) has a wedge-shaped groove (302) on the upper end of its outer wall, which is filled with grease (303). The piston (3) has a piston seal (301) on the lower end of its outer wall.

3. The self-lubricating vertical jack as described in claim 1, characterized in that: The piston rod (2) has a threaded cavity (202) coaxially inside. The adjusting screw (4) has threads evenly distributed on its outer circumference. The adjusting screw (4) is threadedly connected to the threaded cavity (202). The top surface of the top head (5) has a cross groove (501).

4. A self-lubricating vertical jack as described in claim 1, characterized in that: The hydraulic cylinder body (1) is provided with a limiting sleeve (7) at one end near the nut seat (6). The limiting sleeve (7) abuts against the outer wall of the piston rod (2). A sealing ring (701) is provided between the limiting sleeve (7) and the piston rod (2). The lower end of the limiting sleeve (7) is connected to the oil storage tank (702).

5. A self-lubricating vertical jack as described in claim 1, characterized in that: The nut seat (6) further includes a drainage groove (601), a sealing block (602), a guide hole (603), a sealing layer (604), and a handle (605). The upper surface of the nut seat (6) is provided with a drainage groove (601). The lower end of the drainage groove (601) is connected to the guide hole (603). The sealing block (602) is embedded in the drainage groove (601). The sealing block (602) includes a sealing layer (604) and a handle (605). The sealing layer (604) covers the lower end of the sealing block (602), and the handle (605) is installed on the upper end of the sealing block (602).

6. A self-lubricating vertical jack as described in claim 5, characterized in that: The upper end of the guide hole (603) is connected to the flow channel (601), the guide hole (603) passes through the nut seat (6) and the limiting sleeve (7) in sequence, and the lower end of the guide hole (603) is connected to the oil storage tank (702).

7. A self-lubricating vertical jack as described in claim 1, characterized in that: The base (8) is provided with a return oil valve (801) and a safety stop valve (802), and the base (8) is provided with reinforcing ribs (803) symmetrically on both sides of the return oil valve (801) and the safety stop valve (802).

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