A device for replacing the sealing ring on the inner wall of a hydraulic cylinder.
By designing an external operating device suitable for high-pressure power cylinders, the problem of difficult seal replacement was solved, enabling efficient, safe, and reliable installation of seals, adapting to different sizes, and improving maintenance efficiency and production continuity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINXING DUCTILE IRON PIPES CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-17
AI Technical Summary
Wear of the sealing ring on the inner wall of the high-pressure power cylinder leads to poor sealing and oil leakage. Traditional replacement methods require reaching into a narrow space by hand, which is difficult to install and time-consuming.
A device comprising first and second movable handles, fixed jaws and adjustable jaws is designed. Force is transmitted through mechanical levers, and external operation enables precise delivery and positioning of the sealing ring. The device utilizes a V-shaped structure and anti-slip texture to enhance clamping and adapt to sealing rings of different sizes.
The seals can be installed efficiently and effortlessly without entering the cylinder, shortening replacement time, protecting the integrity of the seals, and improving maintenance efficiency and reliability.
Smart Images
Figure CN224509574U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of high-pressure power cylinder repair technology, and in particular to a device for replacing the sealing ring on the inner wall of a cylinder. Background Technology
[0002] High-pressure hydraulic cylinders have complex structures, and the piston's continuous operation can easily cause wear on the inner wall seals, leading to poor sealing, oil leakage, or internal pressure leakage, affecting normal production and use. Therefore, it is often necessary to remove the piston rod and replace the inner wall seals. Because most hydraulic cylinders are long and have narrow inner walls, replacing damaged seals is difficult. After destructively removing the old seals, new seals must be installed without being able to reach inside the cylinder. Typically, the seal size is slightly larger than the cylinder's inner wall, making installation into the sealing groove difficult, time-consuming, and labor-intensive.
[0003] Therefore, it is necessary to develop a device for replacing the sealing ring on the inner wall of a hydraulic cylinder, so as to install the sealing ring on the inner wall of a high-pressure hydraulic cylinder. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a device for replacing the sealing ring on the inner wall of an oil cylinder. When in use, the operator can accurately deliver, position and press the sealing ring into the sealing groove without having to put his hand into the oil cylinder, which directly solves the problem that the inner wall of the oil cylinder is narrow and the hand cannot enter.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0006] A device for replacing the sealing ring on the inner wall of a hydraulic cylinder includes a first movable handle, a second movable handle, a fixed claw mounted on both the first and second movable handles, a first adjustable claw mounted on the first movable handle, and a second adjustable claw mounted on the second movable handle. The first and second adjustable claws are arranged parallel to each other on both sides of the fixed claw. Both the first and second movable handles include a straight section and a handheld end inclinedly disposed on the outside of the straight section. The straight section is provided with a plurality of adjustment holes.
[0007] A further improvement of the present invention is that the upper ends of the first adjustable claw and the second adjustable claw are V-shaped, and the upper ends of the first adjustable claw and the second adjustable claw are arranged opposite to each other.
[0008] A further improvement of this utility model is that the heights of the first adjustable claw and the second adjustable claw are both greater than the height of the fixed claw.
[0009] A further improvement of this utility model is that the upper working surfaces of both the first adjustable claw and the second adjustable claw are provided with anti-slip textures or rubber pads.
[0010] A further improvement of this utility model is that the adjustment hole is an elongated hole, the length of which is parallel to the axis of the straight sections of the first and second movable handles.
[0011] A further improvement of this utility model is that at least four adjustment holes are provided along the length direction of the straight section.
[0012] A further improvement of this utility model is that the fixed claw is connected to the first movable handle and the second movable handle by a detachable hinge.
[0013] A further improvement of this utility model is that the handheld ends of both the first and second movable handles are provided with anti-slip ripples or rubber sleeves.
[0014] A further improvement of this utility model is that the thickness of the first adjustable claw and the second adjustable claw is less than that of the fixed claw, forming a stepped clamping structure.
[0015] A further improvement of this utility model is that the intersection of the first movable handle and the second movable handle is connected by a damping shaft to achieve stepless opening and closing angle adjustment.
[0016] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:
[0017] 1. This utility model, through the combined design of a first adjustable jaw, a second adjustable jaw, and a fixed jaw, and especially with the addition of a straight section and handle to the movable handle, allows the operator to accurately deliver, position, and press the sealing ring into the sealing groove without having to put their hand inside the hydraulic cylinder. This directly solves the core problem of the narrow inner wall of the hydraulic cylinder, which makes it impossible for a person to enter.
[0018] 2. The V-shaped structure in this utility model, in which the first adjustable claw and the second adjustable claw are arranged opposite each other, can stably hold a specific part of the sealing ring (such as the bottom or a specific edge), providing a reliable reference positioning point and preventing the sealing ring from shifting or tilting during operation.
[0019] 3. In this utility model, the first adjustable claw and the second adjustable claw can be precisely adjusted relative to the fixed claw through the adjustment hole to form a three-point clamping structure, which firmly and evenly grips the sealing ring (especially the part that needs to be pressed into the groove), ensuring that the sealing ring maintains the correct posture during the pushing process.
[0020] 4. The oblong adjustment hole and multiple holes evenly arranged in the straight section of this utility model allow for a wide range of flexible adjustments to the positions of the first and second adjustable jaws. This enables the device to adapt to various cylinder inner wall seals of different diameters and sizes, making it highly versatile and eliminating the need for specialized tools for each specification.
[0021] 5. This utility model transmits force through mechanical levers (first movable handle and second movable handle). The operator only needs to hold and operate the handle outside the cylinder to push the sealing ring of the clamping letter smoothly and controllably into the sealing groove deep inside the cylinder. This is much more efficient and labor-saving than the traditional blind operation using simple tools such as pry bars and wires. It also avoids problems such as repeated attempts, sealing ring falling off, and incorrect positioning, and significantly shortens the replacement time.
[0022] 6. The anti-slip texture or rubber pad on the working surface of this utility model increases the friction of the clamping surface, which can prevent the sealing ring from slipping or accidentally falling off during the pushing process. At the same time, the soft rubber pad can effectively avoid pinching or scratching the surface of the sealing ring, ensuring the integrity of the new sealing ring.
[0023] 7. In this utility model, the thinner adjustable jaws can preferentially extend into narrower spaces for initial positioning and guidance, while the thicker fixed jaws provide the main clamping force. This design further reduces the requirements for operating space and reduces the risk of damage to the sealing ring caused by interference between the jaws and the cylinder wall or other components.
[0024] 8. In this utility model, the anti-slip ripples or rubber sleeve on the handpiece ensure that the operator can hold it firmly and comfortably when applying force, and it is not easy to slip and drop the hand, thus improving the safety of operation.
[0025] 9. The detachable hinged connection in this utility model facilitates maintenance, replacement of the chuck, or adjustment of the tool configuration.
[0026] 10. The damping shaft in this utility model enables stepless adjustment of the handle opening and closing angle to adapt to different operating postures. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of a device for replacing the sealing ring on the inner wall of an oil cylinder, provided in an embodiment of this utility model.
[0029] Among them, 1. First movable handle; 2. Second movable handle; 3. Fixed claw; 4. First adjustable claw; 5. Second adjustable claw; 6. Adjustment hole. Detailed Implementation
[0030] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.
[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:
[0034] like Figure 1 As shown, a device for replacing the sealing ring of the inner wall of a hydraulic cylinder includes a first movable handle 1, a second movable handle 2, a fixed claw 3 simultaneously mounted on the first movable handle 1 and the second movable handle 2, a first adjustable claw 4 mounted on the first movable handle 1, and a second adjustable claw 5 mounted on the second movable handle 2; the first adjustable claw 4 and the second adjustable claw 5 are arranged in parallel on both sides of the fixed claw 3; the first movable handle 1 and the second movable handle 2 each include a straight section and a handheld end inclinedly disposed on the outside of the straight section, and a plurality of adjustment holes 6 are provided on the straight section.
[0035] Furthermore, the upper ends of the first adjustable claw 4 and the second adjustable claw 5 are V-shaped, and the upper ends of the first adjustable claw 4 and the second adjustable claw 5 are arranged opposite to each other.
[0036] Furthermore, the heights of the first adjustable claw 4 and the second adjustable claw 5 are both greater than the height of the fixed claw 3.
[0037] Furthermore, the upper working surfaces of the first adjustable jaw 4 and the second adjustable jaw 5 are both provided with anti-slip textures or rubber pads.
[0038] Furthermore, the adjustment hole 6 is an oblong hole, the length of which is parallel to the axis of the straight section of the first movable handle 1 and the second movable handle 2.
[0039] Furthermore, at least four adjustment holes 6 are provided along the length of the straight section. The number of adjustment holes 6 can be adjusted according to actual application needs.
[0040] Furthermore, the fixed claw 3 is connected to the first movable handle 1 and the second movable handle 2 by a detachable hinge.
[0041] Furthermore, both the handheld ends of the first movable handle 1 and the second movable handle 2 are provided with anti-slip ripples or rubber sleeves.
[0042] Furthermore, the thickness of the first adjustable jaw 4 and the second adjustable jaw 5 is less than that of the fixed jaw 3, forming a stepped clamping structure.
[0043] Furthermore, the intersection of the first movable handle 1 and the second movable handle 2 is connected by a damping pivot, enabling stepless adjustment of the opening and closing angle.
[0044] How to use:
[0045] When installing the sealing ring, first select the appropriate hole position to install the first adjustable claw 4 and the second adjustable claw 5. Then, place the two first adjustable claws 4 and the second adjustable claw 5 inside the sealing ring, place the fixed claw 3 outside the sealing ring, and at the same time rotate the first movable handle 1 and the second movable handle 2 to make the sealing ring form a concave shape and push it into the installation groove along the cylinder axis. After the sealing ring is installed, retract the device.
[0046] Skilled operators can complete a single replacement in 2 minutes and 30 seconds (measured with a Φ150mm hydraulic cylinder), which is 300% faster than the traditional method.
[0047] In summary, this utility model creatively provides a special tool that can be operated from outside the cylinder, can be precisely clamped and positioned, can adapt to different sizes, is labor-saving and efficient, and can protect the sealing ring. It completely overcomes the industry problem of manually replacing the sealing ring deep inside the narrow cylinder wall, which is difficult, time-consuming, labor-intensive, and prone to damaging the new sealing ring. It greatly improves maintenance efficiency and reliability, and ensures the normal operation of the high-pressure cylinder and the continuity of production.
[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A device for replacing a seal ring in an inner wall of a cylinder, characterized in that: It includes a first movable handle (1), a second movable handle (2), a fixed claw (3) installed on both the first movable handle (1) and the second movable handle (2), a first adjustable claw (4) installed on the first movable handle (1), and a second adjustable claw (5) installed on the second movable handle (2); the first adjustable claw (4) and the second adjustable claw (5) are arranged in parallel on both sides of the fixed claw (3); the first movable handle (1) and the second movable handle (2) each include a straight section and a handheld end inclinedly arranged on the outside of the straight section, and the straight section is provided with a plurality of adjustment holes (6).
2. The apparatus of claim 1, wherein: The upper ends of the first adjustable claw (4) and the second adjustable claw (5) are V-shaped, and the upper ends of the first adjustable claw (4) and the second adjustable claw (5) are arranged opposite to each other.
3. The apparatus of claim 1, wherein: The heights of the first adjustable claw (4) and the second adjustable claw (5) are both greater than the height of the fixed claw (3).
4. The apparatus of claim 1, wherein: The upper working surfaces of the first adjustable claw (4) and the second adjustable claw (5) are provided with anti-slip textures or rubber pads.
5. The apparatus of claim 1, wherein: The adjustment hole (6) is an oblong hole, the length of which is parallel to the straight axis of the first movable handle (1) and the second movable handle (2).
6. The apparatus of claim 1, wherein: At least four adjustment holes (6) are provided along the length of the straight section.
7. The apparatus of claim 1, wherein: The fixed claw (3) is detachably hinged to the first movable handle (1) and the second movable handle (2).
8. The apparatus of claim 1, wherein: Both the first movable handle (1) and the second movable handle (2) have anti-slip ripples or rubber sleeves on their hand-held ends.
9. The apparatus of claim 1, wherein: The thickness of the first adjustable jaw (4) and the second adjustable jaw (5) is smaller than that of the fixed jaw (3), forming a stepped clamping structure.
10. The apparatus of claim 1, wherein: The intersection of the first movable handle (1) and the second movable handle (2) is connected by a damping shaft to achieve stepless opening and closing angle adjustment.