Pressure-adjustable double-cylinder gas spring device based on multi-stage telescopic locking structure

Abstract

The utility model discloses a pressure-adjustable double-cylinder gas spring device based on a multi-stage telescopic locking structure, which comprises an inner cylinder, an outer cylinder, the multi-stage telescopic locking structure and a base, and the multi-stage telescopic locking structure comprises a shifting piece, an upper tooth column, a fixed locking piece, a lower tooth column, a cushion block and a spring. The outer cylinder is sleeved outside the inner cylinder, is connected with the inner cylinder through a permeable plate, and is filled with high-pressure nitrogen; the multi-stage telescopic locking structure is mounted between the inner cylinder and the outer cylinder; the base is installed at the lower end of the outer cylinder and fixedly connected with the outer cylinder through bolts. According to the device, an inner and outer double-cylinder structure is adopted, the upper tooth column and the lower tooth column are not completely meshed through the compression spring, the lower tooth column is driven to be locked in the square grooves with different depths of the fixed locking piece under the action of the inclined plane, and multi-stage pressure adjustment of the outer cylinder is achieved. Due to the adoption of the multi-stage telescopic locking structure, the pressure can be adjusted on the premise that the stroke of the gas spring is not changed, so that the stability of pressure adjustment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas springs, especially to the adjustable pressure double-cylinder gas spring device based on multistage telescopic locking structure. BACKGROUND

[0002] As an industrial accessory, gas springs have the functions of supporting, buffering and height adjustment, and are widely used in the fields of automobiles, aviation, medical devices, furniture and mechanical manufacturing. Its principle is to fill inert gas or oil-gas mixture into a closed pressure cylinder, so that the pressure in the cavity is higher than the atmospheric pressure, thereby using the pressure difference to push the piston rod, which has the advantages of small volume, large elastic force and stable work. For the existing gas spring device, when adjusting the internal pressure, the cylinder body needs to be removed, and then the internal cavity can be inflated and deflated. This adjustment method cannot adjust the internal pressure of the gas spring in real time, and the disassembly method may cause the sealing performance to decrease or even be damaged. Therefore, this patent focuses on researching a gas spring device that can adjust the internal pressure without disassembling the cylinder body.

[0003] In view of the above problems, relevant patents are searched. In 2018, Ren Yelin of Changzhou Longxiang Gas Spring Co., Ltd. proposed a pressure-adjustable gas spring (authorized publication number: CN 207830433 U). The utility model sets up a gas flow channel in the piston rod and communicates with the gas storage chamber, sets up a gas pressure regulating valve at the front end of the gas flow channel, pushes the valve rod of the gas pressure regulating valve, and makes the conical sealing pad separate from the conical gas hole. The gas charging and discharging operation of the gas storage chamber can be realized, and the pressure in the gas storage chamber can be adjusted. However, frequent removal of the sealing pad will cause the sealing performance to decrease or even be damaged.

[0004] In 2021, Zhang Xiang et al. of Changzhou Andefu Gas Spring Co., Ltd. proposed a pressure-adjustable gas spring (authorized publication number: CN 215293394 U). The mechanism designed by the utility model has a connecting sleeve, a threaded rod, a movable block and a sealing baffle at the tail end. The movable block is moved by rotating the threaded rod, and then the position of the sealing baffle is adjusted under the elastic action of the pressure spring, realizing the pressure adjustment of the gas spring. However, the change of pressure will cause the change of the elastic force of the pressure spring, making it difficult to maintain the stability of the internal pressure of the gas spring.

[0005] In 2023, Zhu Bing and others of Shanghai Zhenyan Automobile Parts Co., Ltd. proposed a pressure-adjustable gas spring (authorized publication number: CN 221003595 U). The utility model patent sets a floating piston at the tail end of the gas spring device, the floating piston is connected with the adjusting rod, the floating piston is moved by rotating the adjusting rod, thereby adjusting the size of the air cavity, and the pressure of the gas spring is variable. The patent can achieve the purpose of adjustable pressure by changing the volume of the air cavity, but the volume of the compressed air cavity will change the stroke of the gas spring, which may affect the normal working performance of the gas spring. Utility model content

[0006] The utility model aims at overcoming prior art defects, provides based on multistage telescopic locking structure's adjustable pressure double cylinder gas spring device, whole adopts inside and outside double cylinder structure, through adopting multistage telescopic locking structure adjustment outer cylinder cavity's space, make inside and outside double cylinder gas medium can move mutually, realized pressure adjustable, can guarantee in the engineering of adjusting pressure not to change the movement stroke of piston, have stronger stability and practicality, solved the problem of difficult control and unstable pressure in the process of pressure regulation.

[0007] The utility model aims at overcoming prior art defects, provides based on multistage telescopic locking structure's adjustable pressure double cylinder gas spring device, whole adopts inside and outside double cylinder structure, through adopting multistage telescopic locking structure adjustment outer cylinder cavity's space, make inside and outside double cylinder gas medium can move mutually, realized pressure adjustable, can guarantee in the engineering of adjusting pressure not to change the movement stroke of piston, have stronger stability and practicality, solved the problem of difficult control and unstable pressure in the process of pressure regulation.

[0008] As a further limitation of the utility model, the inner cylinder includes a piston rod, a mounting piece, a mounting hole, a first sealing ring, a second sealing ring, an inner cylinder piston, and an inner cylinder cylinder body. The inner cylinder piston is slidingly connected within the inner cylinder cylinder body. One end of the piston rod is fixedly connected with the piston, and the other end is provided with the mounting piece. The mounting hole is formed in the mounting piece. A fixed port is formed in the upper surface of the inner cylinder cylinder body. The piston rod passes through the fixed port and is connected with the inner cylinder piston. The first sealing ring is fixed between the piston rod and the fixed port. The second sealing ring is arranged between the inner cylinder cylinder body and the inner cylinder piston.

[0009] As a further limitation of the utility model, the outer cylinder includes a third sealing ring, an outer cylinder piston, a gas-permeable plate, and an outer cylinder cylinder body. The outer cylinder piston is arranged inside the outer cylinder cylinder body. The third sealing ring is arranged between the outer cylinder piston and the inner wall of the outer cylinder cylinder body. A gas-permeable hole is formed in the gas-permeable plate. The length of the lower end of the outer cylinder cylinder body is greater than the length of the lower end of the inner cylinder cylinder body.

[0010] As a further limitation of the utility model, the multi-stage telescopic locking structure comprises a push piece, an upper tooth column, a fixed locking piece, a lower tooth column, a pad and a spring; the push piece is installed above the upper tooth column; the lower end surface of the upper tooth column is sawtooth-shaped, four equidistant sliding blocks are arranged on the circumferential surface of the lower tooth column; the lower tooth column is installed below the upper tooth column, the sawtooth of the lower end surface of the upper tooth column can be engaged with the sliding blocks on the circumferential surface of the lower tooth column; the fixed locking piece is arranged between the upper tooth column and the lower tooth column, the fixed locking piece is fixed in the outer cylinder body, square grooves of different heights are formed in the circumferential surface of the fixed locking piece, and equidistant sliding grooves are formed in the inner wall of the fixed locking piece; the pad is fixed below the lower tooth column; and the spring is installed below the pad.

[0011] As a further limitation of the utility model, the base comprises a fourth sealing ring, a sealing block and a fixed plate, the fixed plate is fixed at the lower end of the outer cylinder body through bolts, the sealing block is fixed between the upper surface of the fixed plate and the outer cylinder body, and the fourth sealing ring is fixed on the two sides of the sealing block.

[0012] The utility model discloses above technical scheme, compared with prior art, beneficial effect is: 1) the utility model adopts the internal and external double cylinder structure, the size of the space of outer cavity is adjusted, gas medium can move in the internal and external double cylinder, so that the pressure of the oil gas cylinder for gas spring is adjustable, and the movement stroke of the piston is not changed in the pressure regulating process, and the practicability of the gas spring is improved.

[0013] 2) the utility model adopts the multi-stage telescopic locking structure, the upper and lower tooth columns are not completely engaged through the compression spring, the lower tooth column is locked in the square groove of different depths of the fixed locking piece under the action of the inclined plane, the multi-stage pressure regulation of the outer cylinder is realized, the pressure can be adjusted according to the required gear in different occasions, and the utility is strong. ACCURACY OF DRAWINGS

[0014] Figure 1 The overall structure perspective drawing of the utility model.

[0015] Figure 2 The overall structure perspective drawing of the utility model "hidden multi-stage telescopic locking structure".

[0016] Figure 3 The overall structure perspective drawing of the utility model "hidden outer cylinder".

[0017] Figure 4 The fuselage cross section schematic view of the utility model.

[0018] Figure 5 The multi-stage telescopic locking structure of the utility model.

[0019] Figure 6State A of the multi-stage telescopic locking structure of this utility model.

[0020] Figure 7 The multi-stage telescopic locking structure of this utility model is in state B.

[0021] The components include: 1. Inner cylinder; 2. Multi-stage telescopic locking structure; 3. Outer cylinder; 4. Base; 11. Piston rod; 12. Mounting piece; 13. Mounting hole; 14. First sealing ring; 15. Second sealing ring; 16. Inner cylinder piston; 17. Inner cylinder body; 21. Paddle; 22. Upper toothed column; 23. Fixed locking piece; 24. Lower toothed column; 25. Pad; 26. Spring; 31. Third sealing ring; 32. Outer cylinder piston; 33. Vent plate; 34. Outer cylinder body; 41. Fourth sealing ring; 42. Sealing block; 43. Fixing plate. Detailed Implementation

[0022] like Figures 1-3 The adjustable pressure double-cylinder gas spring device based on a multi-stage telescopic locking structure is shown, including an inner cylinder 1, a multi-stage telescopic locking structure 2, an outer cylinder 3, and a base 4; the outer cylinder 3 is sleeved outside the inner cylinder 1 and filled with high-pressure nitrogen gas, and the outer cylinder 3 and the inner cylinder 1 are connected by a vent plate 33; the multi-stage telescopic locking structure 2 is installed between the inner cylinder 1 and the outer cylinder 3; the base 4 is installed at the lower end of the outer cylinder 3 and is fixedly connected to the outer cylinder 3 by bolts; the inner cylinder 1 is filled with high-pressure nitrogen gas.

[0023] like Figure 4 As shown, the inner cylinder 1 includes a piston rod 11, a mounting component 12, a mounting hole 13, a first sealing ring 14, a second sealing ring 15, an inner cylinder piston 16, and an inner cylinder body 17. The inner cylinder piston 16 is slidably connected inside the inner cylinder body 17. One end of the piston rod 11 is fixedly connected to the piston 16, and the other end is fitted with the mounting component 12, which has a mounting hole 13. A fixing port is provided on the upper surface of the inner cylinder body 17, through which the piston rod 11 passes and connects to the inner cylinder piston 16. A first sealing ring 14 is fixed between the piston rod 11 and the fixing port. A second sealing ring 15 is provided between the inner cylinder body 17 and the inner cylinder piston 16.

[0024] The outer cylinder 3 includes a third sealing ring 31, an outer cylinder piston 32, a vent plate 33, and an outer cylinder body 34; the outer cylinder piston 32 is provided inside the outer cylinder body 34, and the third sealing ring 31 is provided between the outer cylinder piston 32 and the inner wall of the outer cylinder body 34; the vent plate 33 has vent holes; the length of the lower end of the outer cylinder body 34 is greater than the length of the lower end of the inner cylinder body 17.

[0025] The base 4 includes a fourth sealing ring 41, a sealing block 42 and a fixing plate 43. The fixing plate 43 is fixed to the lower end of the outer cylinder body 34 by bolts. The sealing block 42 is fixed between the upper surface of the fixing plate 43 and the outer cylinder body 34, and the fourth sealing ring 41 is fixed on both sides of the sealing block 42.

[0026] As Figures 5-7 shown in the figure, the multi-stage telescopic locking structure 2 includes a push piece 21, an upper tooth column 22, a fixed locking piece 23, a lower tooth column 24, a pad 25 and a spring 26; the push piece 21 is installed above the upper tooth column 22; the lower end surface of the upper tooth column 22 is in a sawtooth shape, and four equidistant sliding blocks are arranged on the circumferential surface of the lower tooth column 24; the lower tooth column 24 is installed below the upper tooth column 22, and the sawtooth of the lower end surface of the upper tooth column 22 can be engaged with the sliding blocks on the circumferential surface of the lower tooth column 24; the fixed locking piece 23 is arranged between the upper tooth column 22 and the lower tooth column 24, and is fixed in an outer cylinder body 34; square grooves of different heights are arranged on the circumferential surface of the fixed locking piece 23, and equidistant sliding grooves are arranged on the inner wall of the fixed locking piece 23; the pad 25 is fixed below the lower tooth column 24; and the spring 26 is installed below the pad 25.

[0027] When the piston rod 11 is static during the working of the utility model, an operator presses the push piece 21, thereby pushing the upper tooth column 22 downward, at this time, the lower end sawtooth of the upper tooth column 22 extrudes the sliding blocks of the lower tooth column 24 out of the sliding grooves of the fixed locking piece 23, when the lower tooth column 24 is pushed out of the sliding grooves of the fixed locking piece 23, due to the action of the spring 26, the teeth of the lower tooth column 24 will slide along the inclined surface of the engaged teeth of the upper tooth column 22, and enter the next sliding groove on the fixed locking piece 23, because the lengths of the sliding grooves are different, the function that the pressure of the gas spring is adjustable and self-locking is realized. When the lower tooth column 24 slides from the deep groove to the short groove, the outer cylinder piston 32 is pressed downward, the volume of the outer cylinder gas cavity is reduced, the high-pressure nitrogen gas in the outer cylinder body 34 flows into the gas cavity at the lower part of the inner cylinder body 17 through the gas permeable plate 33, thereby increasing the pressure of the inner cylinder piston 16; when the lower tooth column 24 slides from the short groove to the deep groove, under the rebound action of the spring 26, the outer cylinder piston 32 moves upward under the action of the high-pressure nitrogen gas, the volume of the outer cylinder gas cavity is increased, the high-pressure nitrogen gas in the lower gas cavity of the inner cylinder body 17 flows into the outer cylinder body 34 through the gas permeable plate 33, thereby reducing the pressure of the inner cylinder piston 16.

[0028] The utility model is not limited to the above-mentioned embodiments, on the basis of the technical scheme disclosed in the utility model, the skilled in the art can make some substitutions and deformation to some technical features according to the disclosed technical content without creative labor, and these substitutions and deformation are all within the protection scope of the utility model.

Claims

1. A pressure-adjustable double-cylinder gas spring device based on a multi-stage telescopic locking structure, characterized by, The utility model provides a multi -stage telescopic locking structure (2), outer cylinder (3) and base (4) are contained to inner cylinder (1), outer cylinder (3) is set outside inner cylinder (1), and outer cylinder (3) is connected with inner cylinder (1) through air -permeable board (33), multi -stage telescopic locking structure (2) is installed between inner cylinder (1) and outer cylinder (3), and base (4) is installed at the lower end of outer cylinder (3) and is fixedly connected with outer cylinder (3) through bolt.

2. The adjustable pressure dual cylinder gas spring device based on the multi-stage telescopic locking structure according to claim 1, characterized in that, The inner cylinder (1) includes a piston rod (11), a mounting piece (12), a mounting hole (13), a first sealing ring (14), a second sealing ring (15), an inner cylinder piston (16), and an inner cylinder cylinder body (17). The inner cylinder piston (16) is slidingly connected in the inner cylinder cylinder body (17). One end of the piston rod (11) is fixedly connected with the inner cylinder piston (16), and the other end is provided with the mounting piece (12). The mounting hole (13) is formed in the mounting piece (12). A fixed port is formed in the upper surface of the inner cylinder cylinder body (17). The piston rod (11) passes through the fixed port and is connected with the inner cylinder piston (16). The first sealing ring (14) is fixed between the piston rod (11) and the fixed port. The second sealing ring (15) is arranged between the inner cylinder cylinder body (17) and the inner cylinder piston (16).

3. The adjustable pressure dual cylinder gas spring device based on the multi-stage telescopic locking structure according to claim 2, characterized in that, The outer cylinder (3) includes a third sealing ring (31), an outer cylinder piston (32), an air-permeable board (33), and an outer cylinder cylinder body (34). The outer cylinder piston (32) is arranged in the inner part of the outer cylinder cylinder body (34). The third sealing ring (31) is arranged between the outer cylinder piston (32) and the inner wall of the outer cylinder cylinder body (34). The air-permeable board (33) is provided with an air-permeable hole. The length of the lower end of the outer cylinder cylinder body (34) is greater than the length of the lower end of the inner cylinder cylinder body (17).

4. The adjustable pressure dual cylinder gas spring device based on the multi-stage telescopic locking structure according to claim 3, characterized in that, The multi-stage telescopic locking structure (2) includes a shifting piece (21), an upper tooth column (22), a fixed locking piece (23), a lower tooth column (24), a cushion block (25), and a spring (26). The shifting piece (21) is installed above the upper tooth column (22). The lower end surface of the upper tooth column (22) is sawtooth-shaped. Four equidistant sliding blocks are arranged on the circumferential surface of the lower tooth column (24). The lower tooth column (24) is installed below the upper tooth column (22). The sawteeth of the lower end surface of the upper tooth column (22) can be engaged with the sliding blocks on the circumferential surface of the lower tooth column (24). The fixed locking piece (23) is arranged between the upper tooth column (22) and the lower tooth column (24). The fixed locking piece (23) is fixed in the outer cylinder cylinder body (34). Square grooves with different heights are formed in the circumferential surface of the fixed locking piece (23). Equidistant sliding grooves are formed in the inner wall of the fixed locking piece (23). The cushion block (25) is fixed below the lower tooth column (24). The spring (26) is installed below the cushion block (25).

5. The adjustable pressure dual cylinder gas spring device based on the multi-stage telescopic locking structure according to claim 3, characterized in that, The base (4) comprises a fourth sealing ring (41), a sealing block (42) and a fixing plate (43), the fixing plate (43) is fixed on the lower end of the outer cylinder body (34) by bolts; the upper surface of the fixing plate (43) and the outer cylinder body (34) are fixed with the sealing block (42), and the two sides of the sealing block (42) are fixed with the fourth sealing ring (41).

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