A double-chamber air pressure damper with controllable reset process

Abstract

The application discloses a double-cavity air pressure buffer with controllable reset process, which comprises a buffer system and a limiting system, and the limiting system is connected with the buffer system through a clamping pin base and a thrust bearing which are matched with each other; the buffer system comprises an outer cylinder, an inner cylinder, a piston rod, a separation valve, a reset spring, an upper end cover and a lower end cover; the end, which is in contact with the inner cylinder, of the outer cylinder is respectively provided with an inwardly-contracted protrusion and an outwardly-expanded protrusion; the outer surface of the outer cylinder is provided with an outwardly-expanded circular table structure; the outer cylinder is uniformly provided with six air holes; and the piston rod is provided with four evenly-distributed damping holes. The application can limit the reset movement of the buffer after the buffer is compressed by impact, reduce the shaking and shaking after the buffer process is finished, and realize the active control of the reset process of the buffer; the double-cavity design with adjustable high-pressure chamber pressure enables the buffer to still have good buffering capacity under different loads, and widens the working range of the buffer.

Description

Technical Field

[0001] This invention relates to the field of shock absorber technology, and in particular to a dual-chamber pneumatic shock absorber with a controllable reset process. Background Technology

[0002] Buffers, as devices that absorb impact energy, reduce vibration, and mitigate shocks, are widely used in drones, vehicles, weaponry, machinery, aviation, and aerospace. Currently, common buffers include spring buffers, pneumatic buffers, hydraulic buffers, and buffers utilizing damping materials. However, without exception, in conventional buffering methods, when the protected structure encounters an impact, the buffer is compressed to its limit to provide cushioning. But because there are no other mechanisms in place, the buffer immediately rebounds after reaching its limit, causing the protected structure to vibrate and shake continuously, reducing its safety and stability. Furthermore, some protected structures are under load, and the buffering performance requirements differ significantly between loaded and unloaded conditions.

[0003] To address the aforementioned issues, the dual-chamber pneumatic buffer with controllable reset process designed in this invention eliminates the vibration and jitter of traditional buffers after the buffering stroke ends, achieving active controllability of the buffer reset process. Furthermore, the damping of the buffer is adjustable through the dual-chamber design with adjustable air pressure, enabling it to cope with various buffering scenarios under different loads. Summary of the Invention

[0004] 1. Technical problems to be solved

[0005] The purpose of this invention is to solve the problems of existing conventional buffers that produce chatter and jitter after the buffer stroke ends, cannot actively control the reset process, have non-adjustable damping, and are difficult to cope with the buffering requirements under different loads. The invention proposes a dual-chamber pneumatic buffer with controllable reset process.

[0006] 2. Technical Solution

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A dual-chamber pneumatic buffer with controllable reset process includes a buffer system and a limiting system, wherein the limiting system and the buffer system are connected by a mutually cooperating locking pin base and a thrust bearing.

[0009] The buffer system includes an outer cylinder, an inner cylinder, a piston rod, a separator valve, a return spring, an upper end cover, and a lower end cover. The outer cylinder and the inner cylinder have inwardly contracting protrusions and outwardly expanding protrusions at their contacting ends, respectively. The outer surface of the outer cylinder has an outwardly expanding frustum structure.

[0010] The outer cylinder has six vent holes evenly distributed, the piston rod has four damping holes evenly distributed, the inner cylinder has an inwardly contracting ring structure on its inner surface, the ring structure divides the internal space of the inner cylinder into an air chamber and a high-pressure gas chamber, and two support rods are symmetrically distributed on the outer surface of the inner cylinder.

[0011] The limiting system includes a limiting ring, a locking pin, and a roller. The cylindrical surface of the limiting ring has two symmetrical spiral grooves. The upper end face of the limiting ring is engraved with a ring of oblique tooth grooves corresponding to the locking pin. The inside of the limiting ring is fitted with a thrust bearing corresponding to the upper end cover.

[0012] Preferably, the support rod has a frustum-shaped bottom and a cylindrical top, and a roller is rotatably connected to the support rod, allowing the roller to rotate freely on the support rod.

[0013] Preferably, the limiting ring is in an inwardly contracted shape, which can be fitted with the tight ring of the thrust bearing standard component.

[0014] Preferably, the locking pin is U-shaped, and the inner surface of the locking pin is equipped with a corresponding electromagnet and magnet. When energized, the degree of bending of the locking pin increases, releasing the restriction on the limiting ring, thereby allowing the buffer system to reset normally.

[0015] Preferably, a return spring is provided inside the outer cylinder, and the return spring is sleeved on the outside of the piston rod to provide tension for the inner and outer cylinders to return to their original position after compression.

[0016] Preferably, a gas valve is fixedly inserted into the inner wall of the high-pressure gas chamber, and a valve cap corresponding to the gas valve is provided on the outer cylinder. Gases of different pressures can be injected into the high-pressure gas chamber through the gas valve.

[0017] Preferably, the separator valve has a reinforcing rib inside to ensure that no significant deformation occurs during the buffering process.

[0018] Preferably, a sealing ring is provided between the high-pressure gas chamber and the valve cap and lower end cover.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the advantages of this invention are:

[0021] In this invention, the buffer's reset motion is restricted after it is subjected to impact compression, eliminating the vibration and jitter after the buffering process ends, and realizing active control of the buffer reset process; the dual-chamber design with adjustable pressure in the high-pressure chamber enables the buffer to still have good buffering capacity under different loads, thus broadening the buffer's working range. Attached Figure Description

[0022] Figure 1This is a schematic diagram of a dual-cavity pneumatic buffer with controllable reset process proposed in this invention;

[0023] Figure 2 This is a cross-sectional schematic diagram of a dual-cavity pneumatic buffer with controllable reset process proposed in this invention;

[0024] Figure 3 This is a cross-sectional schematic diagram of the outer cylinder system in the buffer system proposed in this invention;

[0025] Figure 4 This is a schematic diagram of the limiting system proposed in this invention;

[0026] Figure 5 This is a schematic diagram of the locking pin structure proposed in this invention;

[0027] Figure 6 This is a cross-sectional schematic diagram of the limiting system proposed in this invention;

[0028] Figure 7 This is a schematic diagram of the inner cylinder system in the buffer system proposed in this invention;

[0029] Figure 8 This is a cross-sectional schematic diagram of the inner cylinder system in the buffer system proposed in this invention.

[0030] In the diagram: 101-Outer cylinder; 102-Upper end cover; 103-Ventilation hole; 104-Piston rod; 105-Reset spring; 106-Damping hole; 201-Limit ring; 202-Pin base; 203-Pin; 2031-Electromagnet; 2032-Magnet; 204-Helical groove; 205-Helical groove; 301-Inner cylinder; 302-Lower end cover; 303-Roller; 304-Valve cap; 305-Divider valve; 306-Support rod; 307-Air chamber; 308-High-pressure gas chamber; 309-Valve; 401-Thread; 402-Thrust bearing; 403-Sealing ring. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Example 1:

[0033] Reference Figure 1A dual-chamber pneumatic shock absorber with controllable reset process includes a buffering system and a limiting system. The buffering system provides cushioning when the shock absorber is subjected to impact loads, and the limiting system ensures that the buffering system does not rebound after absorbing energy. The limiting system includes a limiting ring 201, a locking pin base 202, and a locking pin 203. The limiting ring 201 of the limiting system cooperates with the inner cylinder 301 through a roller 303 mounted on the inner cylinder 301.

[0034] In this embodiment, the locking pin base 202 of the limiting system is assembled to the outer wall of the outer cylinder 101 via threads 401, and the locking pin 203 is fixed to the locking pin base 202, that is, the locking pin 203 is fixedly connected to the outer cylinder 101. Electromagnets 2031 and magnets 2032 are symmetrically assembled on the inner surface of the locking pin 203. When energized, the electromagnets generate magnetic force, causing the open ends of the locking pins 203 to attract each other. Macroscopically, this results in the "U-shaped" distance between the open ends shortening. The protruding position on the outer cylinder 101 engages with the loose ring of the thrust bearing 402, and the inner locking position of the limiting ring 201 engages with the tight ring of the thrust bearing 402, ensuring that the limiting ring 201 can rotate smoothly during the relative movement of the outer cylinder 101 and the inner cylinder 301.

[0035] In this embodiment, the outer cylinder 101 and the upper end cover 102 are connected together by threads 401, and the upper end cover 102 and the piston rod 104 are connected together by threads 401. Six circular vent holes 103 are evenly distributed on the cylindrical surface of the outer cylinder 101. The presence of vent holes 103 allows the air pressure buffer to replenish the required air after one buffering operation, in preparation for the next buffering operation.

[0036] In this embodiment, a return spring 105 is provided inside the outer cylinder 101 to provide force for the reset movement of the buffer, and at the same time avoid the piston rod 104 from having a hard collision with the inside of the inner cylinder 301 during the buffering process. Four damping holes 106 are evenly distributed on the piston rod 104.

[0037] In this embodiment, when the buffer is compressed, i.e., when the outer cylinder 101 and the inner cylinder 301 move relative to each other, the limiting ring 201 moves linearly as the inner and outer cylinders are compressed under the action of the spiral groove 205, and at the same time, it rotates around the central axis of the inner and outer cylinders. When the buffer completes the compression movement, under the action of the return spring 105, the outer cylinder 101 and the inner cylinder 301 tend to move away from each other in a linear motion. However, due to the combined action of the helical tooth groove 204 on the limiting ring 201 and the locking pin 203 fixed to the outer cylinder 101, the limiting ring 201 cannot generate a reverse rotational motion. That is, the outer cylinder 101 and the inner cylinder 301 can only move closer in a linear motion, and cannot move away from each other in a linear motion. Macroscopically, the existence of the limiting system makes it impossible for the buffer system to perform a reset movement after performing the buffering function.

[0038] In this embodiment, relative movement between the inner and outer cylinders can only occur when the limiting ring 201 simultaneously generates linear motion along the axial direction of the inner and outer cylinders and rotational motion centered on the neutral axis of the inner and outer cylinders. This allows the entire buffer to be compressed or reset. Energizing the electromagnet in the locking pin 203 releases the engagement between the locking pin 203 and the helical toothed groove 204, simultaneously removing the restriction on the rotational motion of the limiting ring 201. At this point, the buffer can perform a reset motion, thus achieving controllable reset process for the buffer system.

[0039] In this embodiment, the inner cylinder 301 has two symmetrically distributed support rods 306 with frustum-shaped bottoms and cylindrical tops. Rollers 303 that can roll smoothly are mounted on the support rods 306 to reduce the impact on the support rods 306 during buffering and to assist the limiting ring 201 to rotate smoothly. The inner cylinder 301 has an inwardly contracting limiting inner ring that restricts the movement range of the piston rod 104 and the separating valve 305. The separating valve 305 divides the internal space of the inner cylinder 301 into an air chamber 307 and a high-pressure gas chamber 308.

[0040] In this embodiment, a sealing ring 403 is installed between the high-pressure gas chamber 308 of the inner cylinder 301 and the valve cap 304, and a sealing ring 403 is installed between the high-pressure gas chamber 308 and the lower end cover 302 to ensure the sealing environment of the high-pressure gas chamber 308. The inner cylinder 301 and the lower end cover 302 are connected together by threads 401, and the inner cylinder 301 and the valve cap 304 are connected together by threads 401.

[0041] In this embodiment, gas of different pressures can be injected into the high-pressure gas chamber 308 through the gas valve 309 of the inner cylinder 301, thereby enabling the buffer to better meet the buffering requirements under different working conditions.

[0042] In this embodiment, refer to Figures 2-8 The working process of the dual-chamber design with adjustable high-pressure chamber pressure under different overload conditions is described in this embodiment. In this embodiment, a dual-chamber pneumatic buffer with controllable reset process performs buffering work by having air in the air chamber 307 pass through four damping holes 106 on the piston rod 104. During the impact, the pressure in the air chamber 307 increases sharply. When it reaches the same pressure as the high-pressure gas chamber 308, the separating valve 305 begins to move towards the high-pressure gas chamber 308 under the action of the pressure difference, reducing the impact peak value borne by the inner cylinder 301 and providing secondary buffering for the entire mechanism. When the buffer load is different, the gas pressure in the high-pressure gas chamber 308 can be adjusted as needed, thus better adapting to various working conditions and enriching the buffer's working scenarios.

[0043] In this embodiment, the reset movement of the buffer can be restricted after being subjected to impact compression, reducing the vibration and jitter after the buffering process ends, thus realizing active control of the buffer reset process; the dual-chamber design with adjustable pressure of the high-pressure gas chamber enables the buffer to still have good buffering capacity under different loads, thus broadening the working range of the buffer.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dual-chamber pneumatic buffer with controllable reset process, comprising a buffer system and a limiting system, characterized in that, The limiting system and the buffer system are connected by a locking base (202) that cooperates with each other; The buffer system includes an outer cylinder (101), an inner cylinder (301), a piston rod (104), a separator valve (305), an upper end cap (102), and a lower end cap (302). The outer cylinder (101) has an inwardly contracting protrusion and an outwardly expanding protrusion at the end that contacts the inner cylinder (301). The outer surface of the outer cylinder (101) has an outwardly expanding frustum structure. The outer cylinder (101) has six vent holes (103) evenly distributed, the piston rod (104) has four damping holes (106) evenly distributed, the inner cylinder (301) has an inwardly contracting ring structure on its inner surface, the ring structure divides the internal space of the inner cylinder (301) into an air chamber (307) and a high-pressure gas chamber (308), and two support rods (306) are symmetrically distributed on the outer surface of the inner cylinder (301). The limiting system includes a limiting ring (201), a locking pin (203), and a roller. The cylindrical surface of the limiting ring (201) has two symmetrical spiral grooves (205). The upper end face of the limiting ring (201) is engraved with a ring of helical teeth (204) corresponding to the locking pin (203). The helical teeth (204) are unidirectional, preventing the limiting ring (201) from rotating in the opposite direction. The limiting ring (201) is internally fitted with a thrust bearing corresponding to the upper end cover (102). (402), the outer cylinder (101) and the upper end cover (102) are connected together by threads (401), the upper end cover (102) and the piston rod (104) are connected together by threads (401), the support rod (306) has a frustum-shaped bottom and a cylindrical top, and a roller (303) is rotatably connected to the support rod (306). The limiting ring (201) is connected to the inner cylinder (301) by the roller (303) mounted on the inner cylinder (301), so that the limiting ring ( 201) Simultaneously generating linear motion along the axial direction of the inner and outer cylinders and rotational motion centered on the neutral axis of the inner and outer cylinders, the locking pin base (202) is assembled to the outer wall of the outer cylinder (101) by threads (401), the locking pin (203) is fixed on the locking pin base (202), the limiting ring (201) is inwardly constricted, the locking pin (203) is U-shaped, and the inner surface of the locking pin (203) is equipped with corresponding electromagnets (2031) and magnets (2032), through When the electromagnet (2031) is powered, it generates magnetic force, causing the open ends of the locking pin (203) to attract each other, thereby releasing the engagement between the locking pin (203) and the helical tooth groove (204), and simultaneously releasing the restriction on the rotational movement of the limiting ring (201). The outer cylinder (101) is provided with a return spring (105), which is sleeved on the outside of the piston rod (104), causing the outer cylinder (101) and the inner cylinder (301) to have a tendency to move away from each other in a linear motion.

2. The dual-chamber pneumatic buffer with controllable reset process according to claim 1, characterized in that, A gas valve (309) is fixedly inserted into the inner wall of the high-pressure gas chamber (308), and a gas valve cap (304) corresponding to the gas valve (309) is provided on the outer cylinder (101).

3. The dual-chamber pneumatic buffer with controllable reset process according to claim 1, characterized in that, The separator valve (305) has a reinforcing rib inside.

4. A dual-chamber pneumatic buffer with controllable reset process according to claim 2, characterized in that, A sealing ring (403) is provided between the high-pressure gas chamber (308), the valve cap (304), and the lower end cover (302).

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