Large-stroke self-locking gas spring device based on multi-stage pressing locking structure

Abstract

The large-stroke self-locking gas spring device based on the multi-stage pressing locking structure comprises the multi-stage pressing locking structure and a multi-section telescopic piston rod structure, the multi-stage pressing locking structure is composed of a pressing rod, a fixing sleeve, a sliding block, a limiting column and a spring, the lower end of the pressing rod is connected with a sliding groove in the surface of the sliding block, the limiting column is installed on the end face of the sliding block, and the spring is connected with the fixing sleeve. The sliding block is installed in a groove of the fixing sleeve, and the spring is installed in the fixing sleeve and makes contact with the rear end of the sliding block. The multi-section telescopic piston rod structure is formed by embedding a first piston rod, a second piston rod, a third piston rod and a cylinder body. The multi-stage pressing locking structure is installed in a groove in the end face of the multi-section telescopic piston rod structure. According to the device, a multi-section telescopic piston rod structure is adopted, the piston rod with the gradually-decreased diameter is embedded and combined, the piston rod is subjected to multi-stage telescopic through high-pressure nitrogen, and the large-stroke self-locking effect is achieved. Due to the fact that a multi-stage pressing locking structure is adopted, self-locking can be carried out at different heights, and the device has high stability and practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas spring, especially to big stroke self -locking gas spring device based on multistage press locking structure. BACKGROUND

[0002] As an industrial accessory, gas spring has the functions of supporting, buffering and height adjustment, etc. 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 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. The working stroke of the existing gas spring is limited by the height of the cylinder body. The smaller the height of the cylinder body, the shorter the stroke. For some working environments with limited installation space but large piston rod movement stroke requirements, the limited stroke of the piston rod cannot meet the needs of large stroke work, and the self-locking mechanism is complicated to operate when locking, and it is difficult to reset after locking. Therefore, the utility model provides a big stroke self-locking gas spring device based on multistage press locking structure, which can adjust the self-locking height in real time according to the use needs, and has strong adaptability. The device is suitable for components such as seats and luggage racks that need height adjustment and stable support, as well as the support and buffering of vehicle doors, engine covers and trunks.

[0003] In view of the above problems and requirements, relevant patents are searched. In 2020, Tao Shenghua and others of Changzhou Laitu Gas Spring Co., Ltd. proposed a stroke-adjustable pneumatic rod (authorized publication number: CN 214304991 U). The utility model patent sets a gas bag expansion and contraction piece for adjusting the stroke at the bottom of the pressure cylinder, and adjusts the gas bag expansion and contraction piece through the inflation port, which helps to avoid direct impact of the piston on the bottom surface of the cylinder, causing wear and tear, and prolonging the service life of the cylinder. However, the stroke adjustment of this patent is very limited, and can only be reduced on the basis of the original maximum stroke, and if the pressure is too high, the gas bag may burst, which is less safe.

[0004] In 2021, Du Zhipeng and others of Xinxiang Xinhua Hydraulic Machinery Co., Ltd. proposed a large-stroke air-controlled adjustable air spring (authorized publication number: CN 213808609 U). The utility model patent adopts a double-chamber structure design, and uses the first chamber and the second chamber to charge and discharge high-pressure gas in sequence to advance the piston rod for reciprocating movement. This patent uses double-chamber pressurization to increase the movement stroke of the gas spring, but the mechanism needs to be configured with corresponding devices to realize the charging and discharging operation.

[0005] In 2023, Li Ping and others of Liaocheng Haier Baohu Furniture Co., Ltd. proposed a lockable multi-section gas spring (authorized publication number: CN 221347706 U). The utility model patent realizes the multi-section telescopic extension of the gas spring through the limiting unit and the sequential opening of the multi-valve core, and realizes self-locking by blocking the communication between the rodless cavity and the rod cavity of the cylinder. The patent reduces the overall length after contraction and saves space, but the valve switch of the patent is arranged on the end face of the piston rod, which is easy to be accidentally touched when using the gas spring, and can only be locked at two extreme positions, and cannot realize self-locking during travel.

[0006] In summary, the current gas spring device still has the following problems: 1) the working stroke is short; 2) the locking step of the self-locking positioning mechanism is complex and cannot realize self-locking during travel. In view of the above problems, the utility model provides a large-stroke self-locking gas spring device based on a multi-stage pressing locking structure. Utility model content

[0007] The utility model aims at overcoming the defects of the prior art, and provides a large-stroke self-locking gas spring device based on a multi-stage pressing locking structure. First, a multi-section telescopic piston rod structure is adopted, the piston rod with gradually decreasing diameters is embedded and combined, high-pressure nitrogen gas is used to make the piston rod multi-section telescopic, and the working stroke of the gas spring is improved. Then, a multi-stage pressing locking structure is adopted, which can make the piston rod self-lock at different heights according to the use requirements, improve the practicability of the device, increase the working stroke of the gas spring, and improve the efficiency of positioning, self-locking and resetting.

[0008] The utility model aims at overcoming the defects of the prior art, and provides a large-stroke self-locking gas spring device based on a multi-stage pressing locking structure. First, a multi-section telescopic piston rod structure is adopted, the piston rod with gradually decreasing diameters is embedded and combined, high-pressure nitrogen gas is used to make the piston rod multi-section telescopic, and the working stroke of the gas spring is improved. Then, a multi-stage pressing locking structure is adopted, which can make the piston rod self-lock at different heights according to the use requirements, improve the practicability of the device, increase the working stroke of the gas spring, and improve the efficiency of positioning, self-locking and resetting.

[0009] As a further limitation of the utility model, the multi-section telescopic piston rod structure includes piston rod one, piston rod two, piston rod three and cylinder body, the interiors of piston rod two and piston rod three are all cavities, and are communicated with the cylinder body, piston one is installed in the cavity of piston rod two, and the cavity of piston rod two is sealingly connected with piston one, piston two is installed in the cavity of piston rod three, and the cavity of piston rod three is sealingly connected with piston two, piston three is installed in the cylinder body, and the cylinder body is sealingly connected with piston three, the end faces of piston rod two and piston rod three are all provided with a plurality of grooves.

[0010] As a further limitation of the utility model, the piston rod two includes pressing piece one, supporting rod one, spring one, limiting hole, supporting leg one and piston two, the pressing piece one is installed above the groove on the end face of the piston rod two, the lower end face of the pressing piece one is provided with the limiting hole, the spring one is installed below the pressing piece one, the supporting rod one is connected with the limiting hole on the lower end face of the pressing piece, the supporting rod one is installed in the groove of the piston rod two, and the supporting leg one is installed below the supporting rod one, the surface of the piston two is provided with a groove.

[0011] As a further limitation of the utility model, the piston rod three includes pressing piece two, supporting rod two, guide slide rail one, positioning hole one, supporting leg two and piston three, the pressing piece two is installed above the groove on the end face of the piston rod three, the lower end face of the pressing piece two is provided with the limiting hole, the supporting rod two is connected with the limiting hole on the lower end face of the pressing piece two, the supporting rod two is installed in the groove of the piston rod three, and the supporting leg two is installed below the supporting rod two, the guide slide rail one is installed in the interior of the piston rod three and is connected with the upper and lower end faces of the piston rod three, a plurality of positioning hole ones are formed in the surface of the guide slide rail one, the surface of the piston three is provided with a groove, the guide slide rail one is matched with the piston two and is limited through the groove formed in the surface of the piston two.

[0012] As a further limitation of the utility model, the cylinder body includes guide slide rail two and positioning hole two, the guide slide rail two is installed in the interior of the cylinder body and is connected with the upper and lower end faces of the cylinder body, a plurality of positioning hole two are formed in the surface of the guide slide rail two, the guide slide rail two is matched with the piston three and is limited through the groove formed in the surface of the piston three.

[0013] The utility model discloses above technical scheme, compared with prior art, beneficial effect is: 1) the utility model adopts multi-section telescopic piston rod structure, through inlaying combination diameter different multi-section piston rod, and utilize high pressure nitrogen gas to realize multistage telescopic, thereby can be under the environment of cylinder body height limitation, utilize high pressure nitrogen gas pressure effect fully, increase the working stroke of air spring.

[0014] 2) The utility model discloses a multistage pressing locking structure, through extruding pressure rod downward, drive slider moves in the fixed cover surface groove, compresses back -end spring, makes the spacer block to remove the locking, loosens the pressure rod, under the spring action, the spacer block is reset automatically, and locking is carried out. The device can make piston rod according to the use requirement and lock at different height, improve the practicality of the device. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model discloses the overall structure perspective drawing.

[0016] Figure 2 The utility model discloses the full extension's front view.

[0017] Figure 3 The utility model discloses the full extension's section view.

[0018] Figure 4 The utility model discloses the section partial close -up view of multistage pressing locking structure.

[0019] Figure 5 The utility model discloses the B place partial close -up view.

[0020] Figure 6 The utility model discloses the perspective drawing of pressing locking structure.

[0021] Figure 7 The utility model discloses the left view of pressing locking structure.

[0022] Figure 8 The utility model discloses the section view of pressing locking structure.

[0023] Figure 9 The utility model discloses the section view of initial compression state.

[0024] Figure 10 The utility model discloses the section view under the preliminary extension state.

[0025] Wherein, 1 piston rod one, 2 piston rod two, 3 piston rod three, 4 cylinder, 5 pressing locking structure, 11 piston one, 21 lower pressure paddle one, 22 support rod one, 23 spring one, 24 limit hole, 25 support foot one, 26 piston two, 31 lower pressure paddle two, 32 support rod two, 33 guide slide one, 34 positioning hole one, 35 support foot two, 36 piston three, 41 guide slide two, 42 positioning hole two, 51 pressure rod, 52 fixed cover, 53 slider, 54 limit column, 55 spring two. DETAILED DESCRIPTION

[0026] As Figures 1-8The device comprises a multi-stage pressing locking structure and a multi-section telescopic piston rod structure. The multi-stage pressing locking structure 5 comprises a pressing rod 51, a fixed sleeve 52, a sliding block 53, a limiting column 54 and a spring 55. The sliding block 53 is provided with a sliding groove on both sides of the surface, and the lower end of the pressing rod 51 is installed in the sliding groove on the surface of the sliding block 53. The limiting column 54 is installed on the end face of the sliding block 53. The fixed sleeve 52 is provided with a sliding groove on both sides and a groove on the end face. The sliding block 53 is installed in the groove of the fixed sleeve 52, and the spring 55 is installed in the fixed sleeve 52 and in contact with the rear end face of the sliding block 53. The sliding grooves on both sides of the fixed sleeve 52 limit the pressing rod 51 to move only in the vertical direction. The multi-stage pressing locking structure 5 is installed in the groove on the end face of the multi-section telescopic piston rod structure.

[0027] The multi-section telescopic piston rod structure comprises a plug rod 1, a piston rod 2, a piston rod 3 and a cylinder 4. The interiors of the piston rod 2 and the piston rod 3 are cavities, which are communicated with the cylinder 4. The cavity of the piston rod 2 is installed with a piston 1, and the piston 1 is in sealing connection with the cavity of the piston rod 2. The cavity of the piston rod 3 is installed with a piston 2, and the piston 2 is in sealing connection with the cavity of the piston rod 3. The cylinder 4 is installed with a piston 3, and the piston 3 is in sealing connection with the cylinder 4. The end faces of the piston rod 2 and the piston rod 3 are provided with a plurality of grooves.

[0028] The piston rod 2 comprises a pressing tab 1, a supporting rod 1, a spring 1, a limiting hole 4, a supporting leg 1 and a piston 2. The pressing tab 1 is installed above the groove on the end face of the piston rod 2. The lower end face of the pressing tab 1 is provided with the limiting hole 4. The spring 1 is installed below the pressing tab 1. The supporting rod 1 is connected with the limiting hole 4 on the lower end face of the pressing tab 1. The supporting rod 1 is installed in the groove of the piston rod 2. The supporting leg 1 is installed below the supporting rod 1. The surface of the piston 2 is provided with a groove.

[0029] The piston rod 3 comprises a pressing tab 2, a supporting rod 2, a guide rail 1, a positioning hole 1, a supporting leg 2 and a piston 3. The pressing tab 2 is installed above the groove on the end face of the piston rod 3. The lower end face of the pressing tab 2 is provided with the limiting hole 4. The supporting rod 2 is connected with the limiting hole 4 on the lower end face of the pressing tab 2. The supporting rod 2 is installed in the groove of the piston rod 3. The supporting leg 2 is installed below the supporting rod 2. The guide rail 1 is installed in the interior of the piston rod 3 and connected with the upper and lower end faces of the piston rod 3. The surface of the guide rail 1 is provided with a plurality of positioning holes 1. The surface of the piston 3 is provided with a groove. The guide rail 1 is matched with the piston 2 and limited by the groove on the surface of the piston 2.

[0030] The cylinder body 4 comprises a guide rail two 41 and a positioning hole two 42; the guide rail two 41 is installed inside the cylinder body 4 and is connected with the upper and lower end faces of the cylinder body 4, the surface of the guide rail two 41 is provided with a plurality of positioning hole two 42; the guide rail two 41 cooperates with the piston three 36 and is limited through the recess provided on the surface of the piston three 36.

[0031] The utility model discloses a work time, such as Figures 9-10 As shown in the figure, when the gas spring is at rest, by pressing the pressing push piece one 21, the spring one 23 and the limiting hole 24 are driven to move downwards, the limiting hole 24 drives the supporting rod one 22 to move downwards, the supporting leg one 25 is pressed, under the pushing of the supporting leg one 25, the pressing rod 51 moves vertically downwards along the fixed sleeve, at the same time, by means of the sliding groove on the surface of the sliding block 53, the sliding block 53 is caused to slide along the fixed sleeve 52 to the inside thereof, the spring two 55 is compressed, the limiting column 54 is caused to come out of the positioning hole one 34 on the surface of the guide rail one 33, the locking structure is released, and the piston rod 2 moves upwards. Releasing the pressing push piece one 21, under the action of the spring one 23 and the spring two 55, each mechanism is reset in turn, the limiting column 54 is inserted into the positioning hole one 34 on the surface of the guide rail one 33, and the piston rod 2 is relocked. The piston rod two 2 and the piston rod three 3 in the utility model can realize the multi-gear locking function, and they can also serve as the shell to provide protection and support for the internal structure.

[0032] The utility model discloses not limited to the above-mentioned embodiment, on the basis of the technical scheme disclosed in the utility model, the technical personnel in the art can make some replacement and deformation to some technical features in the disclosed technical content without creative labor, and these replacement and deformation are all within the protection scope of the utility model.

Claims

1. A long-stroke self-locking gas spring device based on a multi-stage pressing and locking structure, characterized in that, The device includes a multi-stage pressing and locking structure (5) and a multi-section telescopic piston rod structure. The multi-stage pressing and locking structure (5) includes a pressure rod (51), a fixed sleeve (52), a slider (53), a limiting post (54), and a second spring (55). The slider (53) has grooves on both sides, and the lower end of the pressure rod (51) is installed in the groove on the surface of the slider (53). The limiting post (54) is installed on the end face of the slider (53). The fixed sleeve (52) has grooves on both sides and a groove on the end face. The slider (53) is installed in the groove of the fixed sleeve (52), and the second spring (55) is installed in the fixed sleeve (52) and contacts the rear end face of the slider (53). The grooves on both sides of the fixed sleeve (52) limit the pressure rod (51). The multi-stage pressing and locking structure (5) is installed in the groove on the end face of the multi-section telescopic piston rod structure.

2. The long-stroke self-locking gas spring device based on a multi-stage pressing and locking structure according to claim 1, characterized in that, The multi-section telescopic piston rod structure includes piston rod one (1), piston rod two (2), piston rod three (3) and cylinder (4); the interiors of piston rod two (2) and piston rod three (3) are hollow cavities that communicate with cylinder (4); piston one (11) is installed in the cavity of piston rod two (2), and piston one (11) is sealed to the cavity of piston rod two (2); piston two (26) is installed in the cavity of piston rod three (3), and piston two (26) is sealed to the cavity of piston rod three (3); piston three (36) is installed in cylinder (4), and piston three (36) is sealed to cylinder (4); several grooves are provided on the end faces of piston rod two (2) and piston rod three (3).

3. The long-stroke self-locking gas spring device based on a multi-stage pressing and locking structure according to claim 2, characterized in that, The piston rod 2 (2) includes a pressing paddle 1 (21), a support rod 1 (22), a spring 1 (23), a limiting hole (24), a support foot 1 (25), and a piston 2 (26). The pressing paddle 1 (21) is installed above the groove on the end face of the piston rod 2 (2). The lower end face of the pressing paddle 1 (21) is provided with a limiting hole (24). The spring 1 (23) is installed below the pressing paddle 1 (21). The support rod 1 (22) is connected to the limiting hole (24) on the lower end face of the pressing paddle 1 (21). The support rod 1 (22) is installed in the groove of the piston rod 2 (2). The support foot 1 (25) is installed below the support rod 1 (22). The surface of the piston 2 (26) is provided with a groove.

4. The long-stroke self-locking gas spring device based on a multi-stage pressing and locking structure according to claim 3, characterized in that, The piston rod three (3) includes a pressing paddle two (31), a support rod two (32), a guide rail one (33), a positioning hole one (34), a support foot two (35), and a piston three (36); the pressing paddle two (31) is installed above the groove on the end face of the piston rod three (3), and the lower end face of the pressing paddle two (31) is provided with a limiting hole (24). The support rod two (32) is connected to the limiting hole (24) on the lower end face of the pressing paddle two (31). The support rod two (32) is installed on the piston. Inside the groove of rod three (3), the second support foot (35) is installed below the second support rod (32); the first guide slide rail (33) is installed inside the piston rod three (3) and connected to the upper and lower end faces of the piston rod three (3); the surface of the first guide slide rail (33) is provided with several positioning holes (34); the surface of the piston three (36) is provided with a groove; the first guide slide rail (33) cooperates with the second piston (26) and is limited by the groove on the surface of the second piston (26).

5. The long-stroke self-locking gas spring device based on a multi-stage pressing and locking structure according to claim 4, characterized in that, The cylinder (4) includes a second guide slide rail (41) and a second positioning hole (42); the second guide slide rail (41) is installed inside the cylinder (4) and connected to the upper and lower end faces of the cylinder (4); the surface of the second guide slide rail (41) is provided with a plurality of second positioning holes (42); the second guide slide rail (41) cooperates with the third piston (36) and is limited by a groove on the surface of the third piston (36).

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