A hydraulic cylinder piston rod anti-rotation locking structure

Abstract

This utility model discloses an anti-rotation locking structure for a piston rod of a hydraulic cylinder, relating to the field of hydraulic cylinder technology. It includes a cylinder body, which comprises a cylinder block. A piston rod body is slidably connected to the inner wall of the cylinder body, and a positioning flange is fixedly connected to the outer wall of the cylinder body. A cylinder connecting flange is bolted to the outer wall of the positioning flange. A second sliding sleeve structure is fixedly connected to the outer wall of the cylinder connecting flange. A slider is slidably connected to the outer wall of the second sliding sleeve structure. A first sliding sleeve structure is bolted to the outer wall of the slider. A piston connecting flange is fixedly connected to the outer wall of the first sliding sleeve structure. Through the sliding cooperation between the slider and the sliding sleeve, the circumferential rotation during the reciprocating motion of the piston rod body is effectively restricted, ensuring the stability of the piston rod flange end connection structure. Simultaneously, by placing the anti-rotation structure externally, inspectors can directly observe the wear and fit of the slider and sliding sleeve, facilitating maintenance and repair.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a piston rod anti-rotation locking structure for hydraulic cylinders. Background Technology

[0002] Hydraulic cylinders are widely used as core power components in fields such as engineering machinery and industrial automation equipment. The stability of their piston rods during reciprocating motion directly affects the operating accuracy and reliability of the equipment. Traditional hydraulic cylinders lack anti-rotation structures on the piston rods, which makes the piston rods prone to rotation during repeated operation, leading to loose connections and affecting the stability of the hydraulic cylinder during use. Some hydraulic cylinders with anti-rotation structures often adopt an internal design, limiting piston rod rotation by adding keyways, splines, or guide keys inside the cylinder body. However, this type of internal structure has drawbacks: First, because the anti-rotation components are hidden inside the cylinder body, inspectors cannot directly observe their wear and fit. It is necessary to disassemble the complex cylinder structure for inspection, which is not only time-consuming and labor-intensive, but also prone to missing early warnings of structural failure, increasing the risk of sudden equipment failure. Second, the lubrication and maintenance of internal anti-rotation structures is difficult, requiring specialized tools to reach deep into the cylinder body for lubrication. In addition, metal shavings, wear particles, and other contaminants generated during sliding friction of the internal structure can easily mix into the hydraulic oil, leading to hydraulic oil contamination, unstable system pressure, and other problems, affecting cylinder performance. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides an anti-rotation locking structure for a piston rod of a hydraulic cylinder. Through anti-rotation design and sliding engagement mechanism, it prevents the piston rod from rotating after multiple movements. At the same time, by placing the anti-rotation structure externally, it is convenient to check whether the structure has failed and to facilitate maintenance, thereby improving the operational stability and maintenance convenience of the hydraulic cylinder.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a piston rod anti-rotation locking structure for a hydraulic cylinder, comprising a cylinder body, the cylinder body including a cylinder body, a piston rod body slidably connected to the inner wall of the cylinder body, and a positioning flange fixedly connected to the outer wall of the cylinder body;

[0007] Preferably, the outer wall of the positioning flange is bolted to a cylinder connecting flange, the outer wall of the cylinder connecting flange is bolted to a second sliding sleeve structure, the outer wall of the second sliding sleeve structure is slidably connected to a slider, the outer wall of the slider is bolted to a first sliding sleeve structure, and the outer wall of the first sliding sleeve structure is bolted to a piston connecting flange. Through the sliding cooperation between the slider and the sliding sleeve, the circumferential rotation during the reciprocating motion of the piston rod body is effectively restricted, ensuring the stability of the piston rod flange end connection structure. With the anti-rotation structure externally mounted, inspectors can visually observe the wear and fit of the slider and the sliding sleeve, and quickly determine whether the structure has failed.

[0008] Preferably, the first sliding sleeve structure includes a positioning sleeve, a fixing flange is fixedly connected to the outer wall of the positioning sleeve, a connecting hole is provided in the wall of the positioning sleeve, the outer wall of the fixing flange is slidably connected to the outer wall of the piston connecting flange by bolts, the inner wall of the piston connecting flange is fixedly connected to the outer wall of the piston rod body, and the inner wall of the positioning sleeve is fixedly connected to the outer wall of the slider by the connecting hole and bolts. The external design exposes the sliding contact surface between the slider and the sliding sleeve to the outside, so that lubricating oil can be applied directly, simplifying the maintenance process.

[0009] Preferably, the second sliding sleeve structure includes a limiting sleeve, the wall of which has a sliding groove. The outer wall of the limiting sleeve is fixedly connected to the outer wall of the cylinder connecting flange. The outer wall of the limiting sleeve is slidably connected to the outer wall of the slider through the sliding groove. The inner side wall of the limiting sleeve is slidably connected to the outer side wall of the positioning sleeve. Because the sliding sleeve is external, contaminants generated by sliding friction are difficult to enter the cylinder, thus avoiding contamination of the hydraulic oil and preventing the normal operation of the cylinder from being affected by the deterioration of oil quality. At the same time, since the contaminants are located on the outside, cleaning only requires wiping or disassembling the external parts.

[0010] (III) Beneficial Effects

[0011] This utility model provides an anti-rotation locking structure for a piston rod of a hydraulic cylinder. It has the following beneficial effects:

[0012] (i) The anti-rotation locking structure, through the sliding cooperation between the slider and the sliding sleeve, effectively restricts the circumferential rotation of the piston rod body during its reciprocating motion, ensuring the stability of the piston rod flange end connection structure, avoiding loosening of the connection or uneven force due to rotation, and ensuring the stable operation of the hydraulic system.

[0013] (ii) The anti-rotation locking structure, by placing the anti-rotation structure externally, allows inspectors to directly observe the wear and fit of the slider and sleeve, quickly determine whether the structure has failed, without disassembling the complex internal structure, thereby improving inspection efficiency and timely detection of potential problems.

[0014] (III) The anti-rotation locking structure, through its external design, exposes the sliding contact surface between the slider and the sleeve, allowing for direct application of lubricating oil, simplifying the maintenance process, reducing frictional wear between components, and extending the service life of the structure.

[0015] (iv) The anti-rotation locking structure prevents contaminants generated by sliding friction from entering the cylinder due to the external placement of the sliding sleeve, thus avoiding contamination of the hydraulic oil and preventing the cylinder from operating normally due to a decline in oil quality. At the same time, since the contaminants are located on the outside, cleaning only requires wiping or disassembling the external parts, without the need for deep cleaning of the cylinder interior, reducing maintenance workload and difficulty. Attached Figure Description

[0016] Fig. 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Fig. 2 This is an exploded structural diagram of the entire utility model;

[0018] Fig. 3 This is a cross-sectional view of the entire utility model.

[0019] In the figure: 1. Cylinder body; 2. First sliding sleeve structure; 3. Second sliding sleeve structure; 4. Piston connecting flange; 5. Cylinder connecting flange; 6. Slider; 11. Cylinder body; 12. Piston rod body; 13. Positioning flange; 21. Positioning sleeve; 22. Fixed flange; 23. Connecting hole; 31. Limiting sleeve; 32. Slide groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figs. 1-3This utility model provides a technical solution: a piston rod anti-rotation locking structure for a hydraulic cylinder, including a cylinder body 1, the cylinder body 1 including a cylinder 11, a piston rod body 12 slidably connected to the inner wall of the cylinder body 11, and a positioning flange 13 fixedly connected to the outer wall of the cylinder body 11; a cylinder connecting flange 5 is fixedly connected to the outer wall of the positioning flange 13 by bolts, a second sliding sleeve structure 3 is fixedly connected to the outer wall of the cylinder connecting flange 5, a slider 6 is slidably connected to the outer wall of the second sliding sleeve structure 3, a first sliding sleeve structure 2 is fixedly connected to the outer wall of the slider 6 by bolts, and a piston connecting flange 4 is fixedly connected to the outer wall of the first sliding sleeve structure 2. The piston rod body 12 inside the cylinder body 11 is a power output component. The positioning flange 13 is fixed to the outer wall of the cylinder body 11 and connected to the cylinder connecting flange 5 by bolts to achieve a stable connection between the cylinder body 11 and the external structure. The inner wall of the limiting sleeve 31 of the second sliding sleeve structure 3 is fixed on the cylinder connecting flange 5. A sliding groove 32 is opened on the limiting sleeve 31 and forms a sliding fit with the slider 6.

[0022] The first sliding sleeve structure 2 includes a positioning sleeve 21. A fixing flange 22 is fixedly connected to the outer wall of the positioning sleeve 21. A connecting hole 23 is opened in the wall of the positioning sleeve 21. The outer wall of the fixing flange 22 is slidably connected to the outer wall of the piston connecting flange 4 by bolts. The inner wall of the piston connecting flange 4 is fixedly connected to the outer wall of the piston rod body 12. The inner wall of the positioning sleeve 21 is fixedly connected to the outer wall of the slider 6 by the connecting hole 23 and bolts. When the cylinder body works and the piston rod body 12 reciprocates, it drives the piston connecting flange 4 and the second sliding sleeve structure 3 to move as a whole. At this time, the slider 6 slides in the groove 32 of the limiting sleeve 31, and the positioning sleeve 21 slides on the inner side wall of the limiting sleeve 31. The sliding cooperation of the two restricts the circumferential rotation of the piston rod body 12 during the axial movement.

[0023] The second sliding sleeve structure 3 includes a limiting sleeve 31, a sliding groove 32 is provided in the wall of the limiting sleeve 31, the outer wall of the limiting sleeve 31 is fixedly connected to the outer wall of the cylinder connecting flange 5, the outer wall of the limiting sleeve 31 is slidably connected to the outer wall of the slider 6 through the sliding groove 32, and the inner side wall of the limiting sleeve 31 is slidably connected to the outer side wall of the positioning sleeve 21.

[0024] When in use, the piston rod anti-rotation locking structure of the hydraulic cylinder is working. The piston rod body 12 inside the cylinder body 11 is the power output component. The positioning flange 13 is fixed to the outer wall of the cylinder body 11 and is connected to the cylinder barrel connecting flange 5 by bolts to achieve a stable connection between the cylinder body 11 and the external structure. The inner wall of the limiting sleeve 31 of the second sliding sleeve structure 3 is fixed on the cylinder barrel connecting flange 5. A sliding groove 32 is opened on the limiting sleeve 31 and forms a sliding fit with the slider 6. The slider 6 is connected to the positioning sleeve 21 connecting hole 23 of the first sliding sleeve structure 2 by bolts. The fixing flange 22 of the positioning sleeve 21 is then connected to the piston connecting flange 4 by bolts. The piston connecting flange 4 is directly fixed to the piston rod body 12.

[0025] When the cylinder body works and the piston rod body 12 reciprocates, it drives the piston connecting flange 4 and the second sliding sleeve structure 3 to move as a whole. At this time, the slider 6 slides in the sliding groove 32 of the limiting sleeve 31, and the positioning sleeve 21 slides on the inner side wall of the limiting sleeve 31. The sliding cooperation of the two restricts the circumferential rotation of the piston rod body 12 during the axial movement, ensuring that the structure connected to the piston rod flange end remains stable and avoiding loosening of the connection or uneven force due to rotation.

[0026] This structure places the anti-rotation function components externally. Compared to an internal anti-rotation structure, inspectors can directly observe the wear and fit of the slider 6, the first sliding sleeve structure 2, and the second sliding sleeve structure 3, and quickly determine whether the anti-rotation structure has failed. At the same time, the external design also makes the lubrication and maintenance process more convenient. Lubricating oil can be directly applied to the sliding contact surface between the slider 6 and the sliding sleeve, reducing friction loss. In addition, contaminants such as metal shavings and lubricating grease deposits generated by friction during sliding are difficult to enter the cylinder due to the external design of the sliding sleeve, avoiding contamination of the hydraulic oil and thus affecting the cylinder performance. When contaminants are located on the outside, cleaning only requires wiping or disassembling the external components, thus reducing maintenance costs.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A piston rod anti-rotation locking structure for a hydraulic cylinder, comprising a cylinder body (1), wherein the cylinder body (1) includes a cylinder body (11), a piston rod body (12) is slidably connected to the inner wall of the cylinder body (11), and a positioning flange (13) is fixedly connected to the outer wall of the cylinder body (11), characterized in that: The outer wall of the positioning flange (13) is fixedly connected to the cylinder connecting flange (5) by bolts. The outer wall of the cylinder connecting flange (5) is fixedly connected to the second sliding sleeve structure (3). The outer wall of the second sliding sleeve structure (3) is slidably connected to the slider (6). The outer wall of the slider (6) is fixedly connected to the first sliding sleeve structure (2) by bolts. The outer wall of the first sliding sleeve structure (2) is fixedly connected to the piston connecting flange (4).

2. The anti-rotation locking structure for a piston rod of a hydraulic cylinder according to claim 1, characterized in that: The first sliding sleeve structure (2) includes a positioning sleeve (21), the outer wall of which is fixedly connected to a fixing flange (22), and a connecting hole (23) is provided in the wall of the positioning sleeve (21).

3. The anti-rotation locking structure for a piston rod of a hydraulic cylinder according to claim 2, characterized in that: The outer wall of the fixed flange (22) is slidably connected to the outer wall of the piston connecting flange (4) by bolts. The inner wall of the piston connecting flange (4) is fixedly connected to the outer wall of the piston rod body (12). The inner wall of the positioning sleeve (21) is fixedly connected to the outer wall of the slider (6) by the connecting hole (23) and bolts.

4. The anti-rotation locking structure for a piston rod of a hydraulic cylinder according to claim 2, characterized in that: The second sliding sleeve structure (3) includes a limiting sleeve (31), and a sliding groove (32) is provided in the wall of the limiting sleeve (31).

5. The anti-rotation locking structure for a piston rod of a hydraulic cylinder according to claim 4, characterized in that: The outer wall of the limiting sleeve (31) is fixedly connected to the outer wall of the cylinder connecting flange (5), and the outer wall of the limiting sleeve (31) is slidably connected to the outer wall of the slider (6) through the sliding groove (32).

6. The anti-rotation locking structure for a piston rod of a hydraulic cylinder according to claim 4, characterized in that: The inner sidewall of the limiting sleeve (31) is slidably connected to the outer sidewall of the positioning sleeve (21).

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