Novel hydraulic oil cylinder buffer device mounting structure
By setting up a buffer chamber with an opening inside the hydraulic cylinder piston, and using the gap between the buffer sleeve, spring and limit guide nut, the problems of insufficient space, high processing requirements and easy damage in the traditional hydraulic cylinder buffer structure in the compact cylinder are solved, achieving compact structure, convenient maintenance and safety improvements.
Patent Information
- Application Number
- CN202421553515.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-03
AI Technical Summary
The buffer structure of the traditional hydraulic cylinder is insufficient in compact cylinders, the piston buffer inner hole processing requirements are high, and it is easy to be damaged after long-term use, resulting in the problem of buffer failure and needing to replace the piston.
The installation structure of the new hydraulic cylinder buffer device is adopted, which includes a buffer chamber with an opening inside the piston. A buffer sleeve is provided in the buffer chamber. The left end of the buffer sleeve is connected to the inner wall of the buffer chamber through a spring, and the right end is installed with a buffer base plate through a screw. A limit guide nut is provided on the piston. The buffer sleeve and the limit guide nut are matched with the gap to replace the traditional guide guide in the buffer chamber.
It achieves compact structure, simple, low processing requirements, convenient maintenance, high safety, high tightening performance and convenient disassembly, avoiding the damage and difficulty in replacing the piston by traditional structures.
Smart Images
Figure CN222910426U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a new type of hydraulic cylinder buffer device. Background Art
[0002] Many hydraulic cylinders are provided with a buffer structure in the moving direction of the piston. The traditional method is to machine a buffer cavity at the bottom of the cylinder, then machine a buffer cavity inner hole for guiding on the piston, and then cooperate with a buffer stroke mechanism to achieve the buffer function. The problems existing in the traditional method and structure are as follows: 1. Additional space is required for machining the buffer area at the bottom of the cylinder. Especially for compact hydraulic cylinders, there may not be enough installation space; 2. The machining requirements for the buffer inner hole on the piston are relatively high; 3. The bottom of the cylinder and the piston may be damaged after long-term use. For example, the buffer inner hole is severely worn or scratched. In the case of buffer failure, only the piston can be replaced. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, a new type of installation structure for a hydraulic cylinder buffer device is provided.
[0004] The technical solution adopted by the utility model to solve its technical problem is: a new type of installation structure for a hydraulic cylinder buffer device, including a cylinder body and a piston inside the cylinder body. A buffer cavity with an opening on one side is opened inside the piston, and a buffer device is arranged inside the buffer cavity;
[0005] The buffer device includes a buffer sleeve. The left end of the buffer sleeve is connected to the left inner wall of the buffer cavity through a spring, and a buffer bottom plate is installed at the right end of the buffer sleeve through screws;
[0006] A limit guiding nut is arranged on the piston at the right end of the buffer cavity, and the limit guiding nut is sleeved on the buffer sleeve.
[0007] Further, a convex ring is arranged in the center of the buffer sleeve of the utility model. When the buffer sleeve moves to the right under the action of the spring, the convex ring is blocked by the limit guiding nut;
[0008] By adopting the above technical solution, it is prevented that when the spring is in the extended state, the buffer sleeve is pushed out of the buffer cavity.
[0009] Further, a concave cavity covering the buffer bottom plate is arranged on the right end face of the piston of the utility model.
[0010] Further, a clearance fit is adopted between the buffer sleeve and the limit guiding nut of the utility model, replacing the traditional guiding by the inner hole of the buffer cavity, and the piston will not be damaged.
[0011] The beneficial effects of the utility model are:
[0012] 1. Compact structure, more space-saving compared with the traditional way of machining a buffer cavity at the bottom of the cylinder, especially suitable for hydraulic cylinders with a compact layout.
[0013] 2. Simple structure, simpler than the traditional way of machining a buffer cavity at the bottom of the cylinder, with a high error tolerance rate.
[0014] 3. Low machining requirements. Similar buffer structures have relatively high requirements for the inner hole of the buffer cavity on the piston, but this structure has almost no requirements for the roughness and size of the buffer cavity.
[0015] 4. More optimized structure: Use the clearance fit between the buffer sleeve and the buffer nut for guiding, replacing the traditional way of using the inner hole of the buffer cavity for guiding, which will not damage the piston.
[0016] 5. Convenient for maintenance and low maintenance cost. If there is wear or spring damage after long-term use, only the corresponding buffer sleeve, buffer nut or spring needs to be replaced. Moreover, the maintenance parts are small and the technical requirements are also very low, greatly reducing the maintenance cost.
[0017] 6. High safety. Compared with the traditional buffer structure that uses the inner hole of the buffer cavity for guiding, this structure will not damage the piston and the bottom of the cylinder as a whole, ensuring the safety of the main parts of the oil cylinder, which is more advantageous. Because in the case of severe wear or scoring of the inner hole and buffer failure in the traditional structure, only the piston can be replaced.
[0018] 7. High fastening performance. Use the thread fixation of the buffer nut to replace the traditional fixation method with a snap ring (or retaining ring), with better fastening performance. Whether the spring is installed at its free length or at its compressed partial length, it can play a good fixing role, which is an advantage that the snap ring (or retaining ring) does not have.
[0019] 8. Convenient for disassembly. The entire buffer structure can be disassembled from the cylinder body together with the piston, which provides great convenience for hydraulic cylinders with a welded structure at the bottom of the cylinder and the cylinder body. Description of the Drawings
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0021] Figure 1 It is a schematic structural diagram of the spring in the free state in the present invention;
[0022] Figure 2It is a schematic structural view of the spring in the fully compressed state in the present utility model.
[0023] Reference numerals in the figure: 1. Oil cylinder body, 2. Piston, 3. Buffer cavity, 4. Buffer sleeve, 5. Spring, 6. Screw, 7. Buffer bottom plate, 8. Limit guiding nut, 9. Convex ring, 10. Concave cavity. Specific embodiments
[0024] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0025] As Figure 1 and Figure 2 shown, a mounting structure of a new type of hydraulic cylinder buffer device includes an oil cylinder body 1 and a piston 2 inside the oil cylinder body 1. A buffer cavity 3 with an opening on one side is formed inside the piston 2, and a buffer device is arranged inside the buffer cavity 3; the buffer device includes a buffer sleeve 4. The left end of the buffer sleeve 4 is connected to the left inner wall of the buffer cavity 3 through a spring 5, and a buffer bottom plate 7 is installed at the right end of the buffer sleeve 4 through a screw 6; a limit guiding nut 8 is arranged on the piston 2 at the right end of the buffer cavity 3, and the limit guiding nut 8 is sleeved on the buffer sleeve 4.
[0026] Wherein, a convex ring 9 is arranged at the center of the buffer sleeve 4. When the buffer sleeve 4 moves to the right under the action of the spring 5, the convex ring 9 is blocked by the limit guiding nut 8; a concave cavity 10 covering the buffer bottom plate 7 is arranged on the right end face of the piston 2.
[0027] A clearance fit is provided between the buffer sleeve 4 and the limit guiding nut 8, replacing the traditional guiding by the inner hole of the buffer cavity, and the piston will not be damaged.
[0028] Working principle:
[0029] 1. As Figure 1 shown, when the piston rod of the hydraulic cylinder extends out, at this time the spring is in a free state and pushes out the buffer sleeve and the buffer bottom plate. Due to the limiting effect of the buffer nut on the buffer sleeve, the spring and the buffer sleeve are not pushed out of the buffer cavity;
[0030] 2. When the piston rod drives the piston to retract, the buffer bottom plate will contact the cylinder bottom. Affected by forces such as the pressure in the rodless cavity, the gravity of the piston rod, piston, and their attached connection devices, and the external load of the oil cylinder, the buffer bottom plate drives the buffer sleeve to move into the buffer cavity. At this time, the spring is compressed and generates an opposite elastic force acting on the cylinder bottom, thereby damping the retraction movement of the piston rod and playing a buffering role. As Figure 2 shown, when the piston rod is fully retracted, the resistance received at this time is the greatest. At the same time, the buffer cavity will limit the buffer bottom plate from continuing to move into the buffer cavity, thus ensuring that the spring compression amount is within the designed range;
[0031] 3. When the hydraulic cylinder operates and the piston rod extends again, the spring returns to its free length again and pushes out the buffer bottom plate.
[0032] Buffer distance adjustment:
[0033] (1) The designer can comprehensively consider the free length of the spring, the compression amount, and the elastic force corresponding to the compression amount to adjust the buffer distance;
[0034] (2) The designer can adjust the buffer distance according to the depth of the entire buffer cavity.
[0035] Buffer force adjustment: The designer can select an appropriate buffer force according to the compression amount of different springs and the elastic force corresponding to the compression amount, avoiding the piston rod being unable to retract completely or being pushed out by the spring elastic force after retraction due to excessive buffer force, and also avoiding poor buffering effect of the buffer device due to too small buffer force.
[0036] As described above, it is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.
Claims
1. A novel hydraulic cylinder buffer device mounting structure, comprising a cylinder body (1) and a piston (2) in the cylinder body (1), characterized in that: A buffer chamber (3) with an opening on one side is provided inside the piston (2), and a buffer device is provided inside the buffer chamber (3); The buffer device comprises a buffer sleeve (4), the left end of the buffer sleeve (4) is connected to the left inner wall of the buffer cavity (3) via a spring (5), and the right end of the buffer sleeve (4) is mounted with a buffer bottom plate (7) via a screw (6); A limit guide nut (8) is provided on the piston (2) at the right end of the buffer chamber (3), and the limit guide nut (8) is sleeved on the buffer sleeve (4).
2. A novel hydraulic cylinder buffer device installation structure as claimed in claim 1, characterized in that: A convex ring (9) is arranged at the center of the buffer sleeve (4). When the buffer sleeve (4) moves to the right under the action of the spring (5), the convex ring (9) is blocked by the limiting guide nut (8).
3. A novel hydraulic cylinder buffer device installation structure as claimed in claim 1, characterized in that: A concave cavity (10) covering the buffer bottom plate (7) is arranged on the right end surface of the piston (2).
4. A novel hydraulic cylinder buffer device installation structure as claimed in claim 1, characterized in that: The buffer sleeve (4) and the limiting guide nut (8) are clearance-fitted.