Dustproof structure of vertical welding hydraulic jack

Abstract

A dustproof structure of a vertical welding hydraulic jack belongs to the technical field of hydraulic jacks. Comprising a jack shell, an oil cylinder arranged in the jack shell and a piston rod moving up and down in the oil cylinder, and further comprises a dustproof ring, the top end of the oil cylinder is expanded to form an extending end, the extending end upwards extends out of the jack shell, and the dustproof ring is arranged at a top opening of the extending end. The inner ring of the dustproof ring is tightly attached to the outer side of the piston rod. The device has the advantages of simple mounting structure, easiness in disassembly, convenience in later repair and maintenance and low use cost.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic jack technology, specifically relating to a dustproof structure for a vertical welded hydraulic jack. Background Technology

[0002] Vertical hydraulic jacks are lifting devices that use plungers or hydraulic cylinders as rigid lifting components. Due to their compact structure, ease of operation, safety, and labor-saving features, they are widely used in various fields of the machinery industry. A typical vertical hydraulic jack consists of a housing, a cylinder, and a piston rod. Lifting and unloading are accomplished by the piston rod moving up and down within the cylinder. In existing jacks, the space between the cylinder and piston rod is open. If external impurities such as dust, mud, or iron filings enter the gap between the cylinder and piston rod, they can easily damage the internal parts of the jack, leading to decreased operational reliability and a shortened service life.

[0003] Numerous published Chinese patent documents contain technical information regarding sealing structures between hydraulic cylinders and piston rods. For example, the "Manual Vertical Hydraulic Jack" disclosed in Chinese Utility Model Patent Publication No. CN210065035U features a dustproof ring located above a guide copper sleeve, with both the guide copper sleeve and the dustproof ring installed within the gap between the large piston rod and the upper cylinder wall of the large hydraulic cylinder. Another example is the "Sealing Structure of a Hydraulic Jack Piston and Top Cover" mentioned in Chinese Invention Patent Application Publication No. CN106698241A, where a top cap is provided at the upper end of the piston rod, and a dustproof ring and guide sleeve are positioned between the top cap and the piston rod. These sealing structures...

[0004] It is difficult to assemble, not easy to disassemble, and has a high cost.

[0005] In view of the aforementioned existing technology, the applicant has made beneficial designs, and the technical solutions to be introduced below are produced in this context. Utility Model Content

[0006] The purpose of this utility model is to provide a dustproof structure for a vertical welded hydraulic jack that is simple in structure, easy to install, and low in cost.

[0007] The purpose of this utility model is achieved as follows: a dustproof structure for a vertical welded hydraulic jack includes a jack housing, an oil cylinder disposed within the jack housing, and a piston rod that moves up and down within the oil cylinder. It also includes a dustproof ring. The oil cylinder has an extension end at its top, which extends upward to the outside of the jack housing. The dustproof ring is disposed at the top opening of the extension end, and the inner ring of the dustproof ring is tightly fitted to the outer side of the piston rod.

[0008] In a specific embodiment of this utility model, the outer periphery of the dustproof ring is bent downward and then extended inward to form a retaining foot. The extended end has a mounting groove on the outer wall of the top opening, and the retaining foot is installed in conjunction with the mounting groove.

[0009] In another specific embodiment of this utility model, the dustproof ring narrows upwards to form a retaining edge, which covers the piston rod and fits tightly with the piston rod.

[0010] In another specific embodiment of this utility model, a pair of limiting sleeves are also included. The pair of limiting sleeves are tightly disposed between the oil cylinder and the piston rod, and a sealing ring is also provided between the pair of limiting sleeves.

[0011] In another specific embodiment of this utility model, a retaining sleeve is further included. The oil cylinder has a retaining sleeve groove formed on its inner wall at a position corresponding to the position above a pair of retaining sleeves. The retaining sleeve is embedded in the retaining sleeve groove and protrudes from the retaining sleeve groove.

[0012] In another specific embodiment of this utility model, the extended end forms a groove on the inner wall of the top opening, and the dustproof ring is embedded in the groove.

[0013] In a further specific embodiment of this utility model, the dustproof ring forms a step on the outer side of the top, which fits tightly with the top opening of the extension end.

[0014] In a further specific embodiment of this utility model, the top surface of the dustproof ring extends upward toward the extension end to form a retaining edge, and the retaining edge covers the piston rod and fits tightly with the piston rod.

[0015] In yet another specific embodiment of this utility model, a limiting sleeve and a sealing ring are further included. The limiting sleeve is tightly disposed between the extension end and the piston rod, and the sealing ring is disposed below the dustproof ring and above the limiting sleeve.

[0016] In yet another specific embodiment of this utility model, the dustproof ring is a rubber ring.

[0017] The present invention, by adopting the above-mentioned structure and placing the dustproof ring on the outside of the piston rod, has the following advantages: simple installation structure, easy disassembly, convenient subsequent maintenance and repair, and low operating cost; good sealing effect, so that when the piston rod moves up and down, impurities attached to the piston rod will not be carried into the jack, thereby reducing the impact of external factors on the product and extending the service life of the jack. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of the first embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the overall structure of the second embodiment of the present utility model;

[0020] Figure 3 for Figure 1 Enlarged view of part A;

[0021] Figure 4 for Figure 2 Enlarged view of part B.

[0022] In the diagram: 1. Jack housing; 2. Hydraulic cylinder; 21. Extension end; 211. Mounting groove; 212. Embedded groove; 22. Retaining ring groove; 3. Piston rod; 4. Dustproof ring; 41. Clamping foot; 42. Edge retainer; 43. Step; 5. Limiting sleeve; 6. Sealing ring; 7. Limiting sleeve retaining ring. Detailed Implementation

[0023] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0024] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0025] Please see Figure 1 This utility model relates to a dustproof structure for a vertical welded hydraulic jack, including a jack housing 1 for storing hydraulic fluid, a hydraulic cylinder 2 disposed within the jack housing 1, and a piston rod 3 that moves up and down within the hydraulic cylinder 2. The dustproof structure also includes a dustproof ring 4, which in this embodiment is preferably a rubber ring. The hydraulic cylinder 2 has an extension end 21 at its top, extending upwards to the outside of the jack housing 1. The upper end of the piston rod 3 extends out from the extension end 21. The dustproof ring 4 is located at the top opening of the extension end 21 for easy disassembly, and the inner ring of the dustproof ring 4 fits tightly against the outer side of the piston rod 3. Example 1

[0026] See Figure 3 and combined Figure 1In this embodiment, the dustproof ring 4 is disposed outside the extension end 21. Specifically, the outer periphery of the dustproof ring 4 bends downward and then extends inward to form a retaining foot 41. The extension end 21 has a mounting groove 211 formed on the outer wall of the top opening. The dustproof ring 4 is fixedly installed by the cooperation of the retaining foot 41 and the mounting groove 211. The dustproof ring 4 narrows upward on the inner ring to form a retaining edge 42. The retaining edge 42 covers the piston rod 3 and fits tightly with the piston rod 3 to effectively seal the gap between the oil cylinder 2 and the piston rod 3.

[0027] Furthermore, this utility model also includes a pair of limiting sleeves 5, which are tightly disposed between the oil cylinder 2 and the piston rod 3, and a sealing ring 6 is also disposed between the pair of limiting sleeves 5. The limiting sleeves 5 and the sealing ring 6 cooperate with each other to form a closed cavity for the piston rod 3 to move up and down within the oil cylinder 2.

[0028] Furthermore, a retaining ring 7 is provided above a pair of retaining sleeves 5. The cylinder 2 has a retaining ring groove 22 formed on its inner wall. The retaining ring 7 is embedded in the retaining ring groove 22 and protrudes from the retaining ring groove 22 to prevent the retaining sleeves 5 from displacing and disengaging from the cylinder 2 during the up and down movement of the piston rod 3.

[0029] In this embodiment, the dustproof ring 4 is directly set on the outside of the extension end 21 of the hydraulic cylinder 2, simplifying the assembly structure. The dustproof ring 4 is set on the outside of the hydraulic cylinder 2 and the piston rod 3, making it easy to disassemble and convenient for later maintenance; moreover, it has a good dustproof effect, and when the piston rod 3 moves up and down, impurities attached to the piston rod 3 will not be brought into the jack. Example 2

[0030] See Figure 2 and Figure 4 In this embodiment, the dustproof ring 4 is disposed within the extension end 21. Specifically, the extension end 21 has a groove 212 formed on the inner wall of its top opening, and the dustproof ring 4 is fitted into this groove 212. The dustproof ring 4 has a step 43 formed on its outer side at the top, which fits tightly with the top opening of the extension end 21 and provides a limiting position. The top surface of the dustproof ring 4 extends upward toward the extension end 21 and forms a retaining edge 42, which covers the piston rod 3 and fits tightly with it. Thus, the dustproof ring 4 effectively seals the gap between the cylinder 2 and the piston rod 3, effectively preventing external dust, gravel, iron filings, and other impurities from entering the jack.

[0031] Furthermore, it also includes a limiting sleeve 5 and a sealing ring 6. The limiting sleeve 5 is tightly disposed between the extension end 21 and the piston rod 3. The sealing ring 6 is disposed below the dustproof ring 4 and above the limiting sleeve 5. The limiting sleeve 5 and the sealing ring 6 cooperate with each other to form a closed cavity for the piston rod 3 to move up and down within the hydraulic cylinder 2.

[0032] The main difference between this embodiment and embodiment 1 is that the dustproof ring 4 is placed inside the opening of the extension end 21. It is also a simple and effective sealing structure that is easy to disassemble and convenient for later maintenance and repair.

Claims

1. A dustproof structure for a vertical welding hydraulic jack, comprising a jack housing (1), a hydraulic cylinder (2) disposed within the jack housing (1), and a piston rod (3) that moves up and down within the hydraulic cylinder (2), characterized in that: It also includes a dustproof ring (4). The cylinder (2) has an extension end (21) at the top. The extension end (21) extends upward to the outside of the jack housing (1). The dustproof ring (4) is set at the top opening of the extension end (21). The inner ring of the dustproof ring (4) is tightly fitted to the outer side of the piston rod (3).

2. The dustproof structure of a vertical welding hydraulic jack according to claim 1, characterized in that: The outer periphery of the dustproof ring (4) is bent downward and then extended inward to form a locking foot (41). The extended end (21) has a mounting groove (211) on the outer wall of the top opening. The locking foot (41) is installed in conjunction with the mounting groove (211).

3. The dustproof structure of a vertical welding hydraulic jack according to claim 2, characterized in that: The dustproof ring (4) narrows upwards to form a retaining edge (42), which covers the piston rod (3) and fits tightly with the piston rod (3).

4. The dustproof structure of a vertical welding hydraulic jack according to claim 2, characterized in that: It also includes a pair of limiting sleeves (5), which are tightly disposed between the oil cylinder (2) and the piston rod (3), and a sealing ring (6) is also provided between the pair of limiting sleeves (5).

5. The dustproof structure of a vertical welding hydraulic jack according to claim 4, characterized in that: It also includes a retaining sleeve (7), and the cylinder (2) has a retaining groove (22) formed on the inner wall at a position corresponding to the position above a pair of retaining sleeves (5). The retaining sleeve (7) is embedded in the retaining groove (22) and protrudes from the retaining groove (22).

6. The dustproof structure of a vertical welding hydraulic jack according to claim 1, characterized in that: The extension end (21) forms a groove (212) on the inner wall of the top opening, and the dust ring (4) is fitted into the groove (212).

7. The dustproof structure of a vertical welding hydraulic jack according to claim 6, characterized in that: The dustproof ring (4) forms a step (43) on the outer side of the top, which fits tightly with the top opening of the extension end (21).

8. The dustproof structure of a vertical welding hydraulic jack according to claim 7, characterized in that: The top surface of the dustproof ring (4) extends outward toward the extension end (21) and forms a retaining edge (42), which covers the piston rod (3) and fits tightly with the piston rod (3).

9. The dustproof structure of a vertical welding hydraulic jack according to claim 6, characterized in that: It also includes a limiting sleeve (5) and a sealing ring (6), wherein the limiting sleeve (5) is tightly disposed between the extension end (21) and the piston rod (3), and the sealing ring (6) is disposed below the dustproof ring (4) and above the limiting sleeve (5).

10. The dustproof structure of a vertical welding hydraulic jack according to claim 2 or 6, characterized in that: The dustproof ring (4) is a rubber ring.

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