An ultra-long multi-stage buffer
By employing a staggered connection design of multiple outer cylinders and the buffer in the buffer, combined with a combination structure of support ring and support belt, the offset problem of the buffer during axial movement is solved, improving stability and reset accuracy, and achieving enhanced smoothness and synchronization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LIAONING QINGYUAN FIRST BUMPER MFG
- Filing Date
- 2026-05-14
- Publication Date
- 2026-06-30
AI Technical Summary
Existing long-stroke buffers are prone to displacement during axial movement and have problems with reset and synchronization, especially in multi-stage cylinder structures, resulting in insufficient stability and smoothness.
The design employs multiple outer cylinders and a buffer, with radial dimension differences between each outer cylinder. Adjacent cylinders are staggered and connected, and the buffer ends abut against each other. A combination structure of support rings and support belts ensures that the buffer does not deviate during axial compression and reset. The positional difference of the support rings and the filling of the support belts prevent friction damage.
This effectively prevents the buffer from deviating during axial movement, improves the buffer's stability and reset accuracy, ensures smoothness and synchronization, and enhances the overall performance of the buffer.
Smart Images
Figure CN122305175A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of buffer technology, specifically an ultra-long multi-stage buffer. Background Technology
[0002] Currently, long-stroke (1200-2500mm) buffers are unprecedented in the domestic industry, primarily used in special industrial scenarios requiring the absorption of massive impact energy and handling large displacements, as well as in rail transportation. This field of long-stroke buffers remains unexplored, necessitating extensive research and testing to address aspects such as buffer compression stability, synchronization, and the accuracy and smoothness of reset. Employing multi-stage cylinder structures with varying numbers of independent counter-buffers within different cylinders presents challenges, including axial displacement under impact. These issues urgently require overcoming.
[0003] This case arose in order to resolve the aforementioned issues. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides an ultra-long multi-stage buffer, which solves the problems mentioned in the background section.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: an ultra-long multi-stage buffer, comprising multiple outer cylinders and multiple buffers, wherein there is a radial dimension difference between any of the outer cylinders, adjacent outer cylinders are partially staggered and slidably connected to each other, the ends of any two buffers abut against each other, each outer cylinder completely covers at least one buffer, and the far ends of the two outer cylinders located on both sides are respectively fixed with screw plugs and plugs; Each of the buffers has multiple support rings installed on its outer ring. Any of the buffers located in the middle is slidably connected to an outer cylinder covering its minimum diameter by means of the support rings, and the support rings are always located inside the outer cylinder. All of the buffers are of the same model.
[0006] As a preferred embodiment, the positions of the support rings provided on the different outer cylinders vary depending on the length of the outer cylinder. When the cylinder is compressed to its limit position under load, the support ring is located inside the outer cylinder, thereby always forming a binding force on the axial compression and reset movement of the buffer, preventing the buffers that are only in contact from deviating from axial movement.
[0007] As a preferred embodiment, one of the outer cylinders at the end is fixed, while the others are movable. The plug is fixed to the outer end of the outer cylinder at the fixed position, and a retaining ring is fixed to the inner circumference of the end of any movable outer cylinder facing the plug.
[0008] As a preferred embodiment, the support ring is further provided with multiple rings, each ring being of a different size, and the support ring and the outer cylinder body are filled by a support belt.
[0009] As a preferred embodiment, the support ring is further provided with 2 to 4 channels, and the support strip has a width of 15 to 50 mm and a thickness of 2.5 to 5 mm.
[0010] As a preferred embodiment, multiple support bands are provided at intervals at the staggered positions of two adjacent outer cylinders; and dustproof rings are provided at the staggered ends of the outer cylinders.
[0011] As a preferred embodiment, one of the outer cylinders is further provided with 1 to 4 buffers.
[0012] As a preferred embodiment, the outer end of the outer cylinder is further positioned to form a misaligned height difference with the adjacent inner cylinder.
[0013] As a preferred embodiment, the plurality of buffers are further comprising any one of a hydraulic-pneumatic buffer, a damping buffer, or a composite buffer (Note: the buffers must be uniform, and each buffer is one of these types). When using a hydraulic-pneumatic buffer, the buffers must be filled with the same amount of hydraulic oil and injected with nitrogen gas at the same pressure.
[0014] By adopting the above technical solution, the ultra-long multi-stage buffer provided by the present invention has the following beneficial effects compared with the prior art: the positions of the support rings set on different outer cylinders vary according to the length of the outer cylinder, so that when the outer cylinder is compressed to its limit position under load, the support rings are still located inside the outer cylinder, thereby always forming a binding force on the axial compression and reset movement of the buffer, avoiding axial movement deviation of the buffers that are only in contact with each other. Secondly, after compression, the end of the outer cylinder still leaves a gap with the support rings set on the adjacent side buffers, avoiding contact with the support rings of the adjacent side buffers. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the present invention under non-load conditions; Figure 2 For the present invention Figure 1 Enlarged schematic diagram of a local structure at point A; Figure 3 This is a schematic diagram of the structure of the present invention under load. Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the local structure at the position of the dashed line.
[0016] In the diagram, 1. Plug; 2. Step; 3. Outer cylinder; 4. Buffer; 5. Impact head; 6. Support ring; 7. Support belt; 8. Retaining ring; 9. Plug; 10. Dustproof ring. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0018] See appendix Figure 1-2 As shown, an ultra-long multi-stage buffer includes multiple outer cylinders 3 and multiple buffers 4. There is a radial dimension difference between any two outer cylinders 3. Adjacent outer cylinders 3 are partially staggered and slidably connected to each other. The ends of any two buffers 4 abut against each other. Each outer cylinder 3 completely covers at least one buffer 4. The far ends of the two outer cylinders 3 on both sides are respectively fixed with screw plugs 9 and plugs 1. Each buffer 4 has multiple support rings 6 installed on its outer ring. Any buffer 4 located in the middle is slidably connected to the outer cylinder 3 covering its smallest diameter by means of the support rings 6, and the support rings 6 are always located inside the outer cylinder 3. All buffers 4 have the same model number.
[0019] The position of the support ring 6 on different outer cylinders varies depending on the length of the outer cylinder 3. When it is contracted to the limit position after being loaded, the support ring 6 is located inside the outer cylinder 3, thus always forming a binding force on the axial compression and reset movement of the buffer 4, avoiding the axial movement deviation of the buffer 4 that is only in contact with each other (due to uneven force causing deflection).
[0020] One outer cylinder 3 at the end is fixed, while the others are movable. A plug 1 is fixed to the outer end of the fixed outer cylinder 3. A retaining ring 8 is fixed to the inner circumference of each movable outer cylinder 3 facing the plug 1, forming a restraint on the internal support ring 6 to prevent it from detaching from the outer cylinder 3. Due to errors in practice, especially in experiments, a displacement difference exists between the buffer 4 and the outer cylinder 3 in the middle position. This causes the support ring 6 to disengage from the corresponding slidingly connected outer cylinder 3. During the return stroke, the support ring 6 cannot re-enter the outer cylinder 3, resulting in a cylinder disengagement problem.
[0021] The support ring 6 has multiple rings, and each support ring 6 is of a different size. The support ring 6 and the outer cylinder are filled by the support belt 7.
[0022] The support ring 6 can be set in 2 to 4 places, and the support strip 7 is 15 to 50 mm wide and 2.5 to 5 mm thick.
[0023] The aforementioned support ring 6 and support strip 7 are made of conventional materials (the support strip 7 consists of three layers: the outer two layers are made of polytetrafluoroethylene plastic, and the middle layer is a metal composite layer of copper powder. This not only avoids rigid contact between the support strip 7 and the inner cylinder, but also forms effective rigid support inside, preventing excessive deformation. It also has high density, can be used for a long time without softening, and is not easy to adhere to the inner wall of the cylinder. Furthermore, the metal layer can be made using methods such as particle mixing molding-sintering).
[0024] Multiple support strips 7 are provided at intervals at the staggered positions of two adjacent outer cylinders 3 to avoid rigid friction damage between the outer cylinders 3; secondly, dustproof rings 10 are provided at the staggered ends of the outer cylinders 3 to prevent dust from entering the gap between the two outer cylinders.
[0025] One to four buffers 4 can be accommodated in one outer cylinder 3, depending on the requirements and the design of the length of the outer cylinder 3.
[0026] One outer cylinder 3 at the end is fixed, while the others are movable. The plug 1 is fixed to the outer end of the outer cylinder 3 at the fixed position.
[0027] The machining of the internal buffer 4 requires special attention to machining accuracy to ensure that all parts used in each buffer 4 are machined in the same batch (except for the different positions and sizes of the support rings 6 installed on all buffers 4, the rest of the structure and size are the same), and the assembly of each buffer 4 must be carried out simultaneously (at the same temperature and pressure).
[0028] When using a hydraulic-pneumatic buffer, the buffer must be filled with the same amount of hydraulic oil and injected with nitrogen at the same pressure to ensure that the buffer 4 is compressed synchronously when subjected to force and rebounds synchronously when unloaded.
[0029] The support ring 6 has multiple rings, and each support ring 6 is of a different size. The support ring 6 is filled with a support strip 7. The support ring 6 has 2 to 4 rings, and the support strip 7 is 15 to 50 mm wide and 2.5 to 5 mm thick.
[0030] To prevent the support ring 6 on the buffer 4 from detaching from the corresponding outer cylinder 3 or from contacting the adjacent outer cylinder 3, the position needs to be designed (the position of the support ring 6 on the outer cylinder of the buffer 4 varies depending on the length of the outer cylinder 3, and the position of the support ring 6 on different buffers 4 is different), as follows.
[0031] First, as attached Figure 3As shown (AA, BB, CC represent different outer cylinder positions), all outer cylinders and buffer 4 are in the maximum stroke state under load. When they are compressed to the limit position after being loaded, the support rings 6 provided on the buffer 4 are all located inside the corresponding outer cylinder 3, thus always forming a binding force on the axial compression and reset movement of the buffer 4, avoiding the deviation of the axial movement of the buffer 4 that is only internally opposed.
[0032] Secondly, such as Figure 4 As shown, after compression, the end of the outer cylinder 3 must not abut against the support ring 6 provided on the adjacent side buffer 4 (the adjacent side in the direction of movement) – a gap is left to avoid structural damage when impacting / colliding with the support ring 6 of the adjacent side buffer 4. The position of the support ring 6 of the buffer 4 located entirely within the outer cylinder 3 can be disregarded.
[0033] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. An ultra-long multi-stage buffer, characterized in that, It includes multiple outer cylinders and multiple buffers. There is a radial dimension difference between any of the outer cylinders. Adjacent outer cylinders are partially staggered and slidably connected to each other. The ends of any two buffers abut against each other. Each outer cylinder completely covers at least one buffer. The far ends of the two outer cylinders located on both sides are respectively fixed with screw plugs and plugs. Each of the buffers has multiple support rings installed on its outer ring, and any of the buffers located in the middle are slidably connected to an outer cylinder covering its minimum diameter by means of the support rings; The position of the support ring provided on the outer cylinder varies depending on the length of the outer cylinder. When it is contracted to its limit position after being subjected to a load, the support ring is located inside the outer cylinder.
2. The ultra-long multi-stage buffer according to claim 1, characterized in that: All of the aforementioned buffers are of the same model.
3. The ultra-long multi-stage buffer according to claim 1, characterized in that: One outer cylinder at the end is fixed, while the others are movable. The plug is fixed to the outer end of the outer cylinder at the fixed position. Each movable outer cylinder has a retaining ring fixed to its inner circumference at the end facing the plug, forming a support ring that restricts the interior.
4. The ultra-long multi-stage buffer according to claim 1, characterized in that: The support ring has multiple rings, and each support ring is of a different size. The support ring and the outer cylinder are filled by a support belt.
5. The ultra-long multi-stage buffer according to claim 1, characterized in that: The support ring has 2 to 4 rings, and the support strip has a width of 15 to 50 mm and a thickness of 2.5 to 5 mm.
6. The ultra-long multi-stage buffer according to claim 1, characterized in that: Multiple support bands are provided at intervals between the staggered positions of two adjacent outer cylinders, and dustproof rings are provided at the staggered ends.
7. A long multi-stage buffer according to any one of claims 1-6, characterized in that: Each of the outer cylinders contains 1 to 4 buffers.
8. The ultra-long multi-stage buffer according to claim 1, characterized in that: The outer end of the outer cylinder is misaligned with the adjacent inner cylinder, creating a height difference.
9. The ultra-long multi-stage buffer according to claim 1, characterized in that: The plurality of buffers are any one of liquid-gas buffers, damping buffers, or composite buffers.