Double-tube self-locking gas spring

Abstract

The invention provides a double-pipe self-locking type gas spring and relates to the technical field of double-pipe self-locking type gas springs, the double-pipe self-locking type gas spring comprises a sleeve, a lubricating structure, a connecting structure and a safety structure, a sliding rod is installed on the inner wall of the sleeve, a connecting piece is arranged at the end, away from the sliding rod, of the sleeve, and a connecting piece is arranged at the end, away from the sleeve, of the sliding rod; the connecting piece and the joining piece are connected with the sliding rod and the sleeve respectively through connecting structures, and a lubricating structure is arranged at the upper end of the sleeve. The problems that when a double-pipe self-locking type spring is used, a lubricating device is arranged in the double-pipe self-locking type spring, but in the actual using process, lubricating oil is troublesome to add and replace, continuous and stable lubrication of sliding parts in the double-pipe self-locking type spring is difficult to achieve, and the service life of the double-pipe self-locking type spring is affected are solved. The problem that the normal use and the service life of the double-tube self-locking spring are affected due to the fact that the sliding rod and the sleeve are prone to being blocked and even abraded due to the fact that friction is too large is solved.

Description

Technical Field

[0001] This invention relates to the field of double-tube self-locking gas spring technology, and more particularly to a double-tube self-locking gas spring. Background Technology

[0002] A double-tube self-locking spring is a mechanical device typically used to provide elastic force and a locking effect. Its design primarily consists of two separate tubes containing a spring element. This design allows the spring to self-lock when compressed or stretched, thus maintaining stability in a specific position.

[0003] Existing technologies, such as the invention with publication number CN109236927A, disclose a dual-tube gas spring device. This patent employs a fixed valve body, a floating piston, an outer chamber, an inner chamber, an on / off switch, a sealing guide sleeve, and a piston. The outer chamber is filled with high-pressure nitrogen, and the inner chamber is filled with hydraulic oil. This invention achieves gas and liquid separation of the filling material through the floating piston. When the piston rod moves, the high-pressure nitrogen and hydraulic oil will not mix together, thus improving the service life of the dual-tube gas spring. This invention sets up an outer chamber and an inner chamber. When the piston rod moves, the high-pressure nitrogen and hydraulic oil must pass through the outer chamber and the inner chamber. Its reaction speed is slower than that of a single-tube gas spring, resulting in a more stable reaction, higher stability, and less susceptibility to damage.

[0004] The inventors discovered in daily use that while double-tube self-locking springs are equipped with internal lubrication devices, adding and replacing lubricating oil is quite cumbersome in actual use. This makes it difficult to achieve continuous and stable lubrication of the sliding parts inside the double-tube self-locking gas spring, which can easily lead to jamming or even wear between the slide rod and the sleeve due to excessive friction. This affects the normal use and service life of the double-tube self-locking spring. Summary of the Invention

[0005] The purpose of this invention is to address the drawback of existing technologies where it is difficult to add lubricating oil periodically, and to propose a double-tube self-locking gas spring.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a double-tube self-locking gas spring, comprising a sleeve, a lubrication structure, a connecting structure, and a safety structure. A sliding rod is installed on the inner wall of the sleeve. A connecting piece is provided at the end of the sleeve away from the sliding rod. A connecting piece is provided at the end of the sliding rod away from the sleeve. The connecting piece and the connecting piece are respectively connected to the sliding rod and the sleeve through the connecting structure. A lubrication structure is provided at the upper end of the sleeve.

[0007] Preferably, the lubrication structure includes a housing, which is fixedly connected to a sleeve. An oil groove is formed on the inner wall of the housing, and a plurality of slots are formed on the inner wall of the oil groove. A connecting groove is formed on the inner wall of the housing, and a plug is interference-fitted to the inner wall of the connecting groove. A lubricating pad is fixedly connected to the inner wall of the housing. Two retaining grooves are formed on the inner wall of the housing, and anti-slip rings are engaged on the inner walls of the retaining grooves.

[0008] This preferred solution allows for simple lubrication of the device: simply open the plug on the outer casing and inject lubricating oil into the oil groove through the connecting groove. The lubricating oil will evenly penetrate the lubrication pad along the groove opening on the inner wall of the oil groove. The lubrication pad is in close contact with the outer wall of the slide rod. As the slide rod slides within the sleeve, the lubrication pad continuously lubricates the surface of the slide rod, effectively reducing friction between the slide rod and the sleeve. At the same time, the anti-slip ring in the slot prevents lubricating oil from leaking from the connection between the outer casing and the sleeve, ensuring a long-lasting and stable lubrication effect. This avoids problems such as slide rod jamming or accelerated wear due to untimely lubrication, thus improving the overall smoothness of sliding and service life of the device.

[0009] Preferably, the anti-slip ring has a circular cross-section and is a rubber ring.

[0010] By adopting this preferred solution, the rubber material not only increases the friction between the rubber material and the plug, preventing the plug from accidentally falling off during use and ensuring the sealing of the lubrication structure, thus avoiding leakage of lubricating oil from the connecting groove, but also has a certain degree of elasticity, which can better adapt to the inner wall shape of the connecting groove, further improving the sealing effect and extending the service life of the lubrication structure.

[0011] Preferably, the arc surface of the stopper is provided with a plurality of auxiliary grooves, and the plurality of auxiliary grooves are evenly distributed on the stopper.

[0012] By adopting this preferred solution, the auxiliary groove can increase the friction between the hand and the stopper, thus preventing slippage when the stopper is pulled.

[0013] Preferably, the cross-section of the lubricating pad is arc-shaped, and the lubricating pad is a sponge pad.

[0014] This preferred design allows the sponge material to fully absorb and slowly release lubricating oil, providing continuous lubrication to the contact area between the slide rod and the sleeve. This effectively reduces frictional wear between components and extends the service life of the device. Simultaneously, the arc-shaped cross-section design allows the lubrication pad to better conform to the slide rod surface, ensuring uniform and comprehensive lubrication.

[0015] Preferably, the sleeve and the sliding rod are provided with a connecting structure at their opposite ends. The connecting structure includes a connecting block. The two connecting blocks are fixedly connected to the sliding rod and the sleeve, respectively. A connecting frame is slidably connected to the arc surface of the connecting block. Two sliding grooves are formed in the inner wall of the connecting frame. A fixing groove is formed in the inner wall of the connecting block. A locking block is slidably connected to the inner wall of the sliding groove. A spring is provided inside the sliding groove. The two ends of the spring are fixedly connected to the locking block and the sliding groove, respectively. The locking block is fixedly connected to the fixing groove. The two connecting frames are fixedly connected to the connecting piece and the connecting component, respectively.

[0016] By adopting this preferred solution, when it is necessary to connect the connectors and the device, the connecting frame is placed on the arc surface of the connecting block, and the locking block is locked into the fixing groove on the inner wall of the connecting block under the elastic force of the spring. This allows for a quick and stable connection between the connector and the sleeve, and between the connector and the slide rod. This avoids the problems of cumbersome operation and inconvenient disassembly caused by bolt tightening or welding in traditional connection methods, improves the convenience of device assembly and maintenance, and ensures the structural strength and stability of the connection parts, ensuring the effective transmission of force during the connection process.

[0017] Preferably, a plurality of friction rings are fixedly connected to the arc surface of the connecting block, and a plurality of mounting grooves are provided on the inner wall of the connecting frame, the mounting grooves being engaged with the friction rings.

[0018] By adopting this preferred solution, the mounting groove and friction ring can increase the friction between the connecting block and the connecting frame, further improving the stability of the connection structure, preventing the connection from loosening due to vibration or external force during the connection process, ensuring that the connecting frame and the connecting block always maintain a stable connection state, thereby guaranteeing the structural reliability of the entire double-tube self-locking gas spring during use.

[0019] Preferably, a positioning rod is fixedly connected inside the slide groove, the positioning rod is slidably connected to the locking block, and the spring is sleeved on the arc surface of the positioning rod.

[0020] By adopting this preferred solution, the positioning rod can limit the spring, preventing the spring from deforming during use and improving the service life of the spring.

[0021] Preferably, the arc surface of the sleeve is provided with a safety structure, the safety structure including a connecting plate, the connecting plate being fixedly connected to the sleeve, a sleeve rod being fixedly connected to the upper surface of the connecting plate, a round rod being slidably connected to the inner wall of the sleeve rod, a connecting plate being fixedly connected to the upper end of the round rod, the connecting plate being fixedly connected to the sliding rod, a plurality of positioning grooves being opened on the inner wall of the sleeve rod, and a plurality of connecting rings being fixedly connected to the arc surface of the lower end of the round rod, the connecting rings abutting against the positioning grooves.

[0022] By adopting this preferred solution, when it is necessary to increase the safety of the device, the sliding of the round rod on the inner wall of the sleeve can drive the connecting plate and the slide rod to move synchronously. When the slide rod moves to the appropriate position, the abutment of the connecting ring and the corresponding positioning groove can achieve a stable fixation of the slide rod position, effectively preventing the slide rod from sliding unexpectedly due to accidental force during use. This significantly improves the overall safety and stability of the device during use and avoids operational risks and equipment damage caused by component displacement.

[0023] Preferably, the connecting ring has a circular cross-section and is a silicone ring.

[0024] By adopting this preferred solution, the silicone material can increase the friction between the round rod and the sleeve rod, preventing the round rod from sliding and generating resistance, thus greatly improving the safety of the device.

[0025] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. In this invention, by setting up a lubrication structure, when the device needs lubrication, simply open the plug on the outer shell and inject lubricating oil into the oil groove through the connecting groove. The lubricating oil will evenly penetrate onto the lubricating pad along the groove opening on the inner wall of the oil groove. The lubricating pad is in close contact with the outer wall of the slide rod. When the slide rod slides in the sleeve, the lubricating pad can continuously lubricate the surface of the slide rod, effectively reducing the friction between the slide rod and the sleeve. At the same time, the anti-slip ring in the slot can prevent lubricating oil from leaking from the connection between the outer shell and the sleeve, ensuring a long-lasting and stable lubrication effect, avoiding the problem of slide rod jamming or accelerated wear due to untimely lubrication, and improving the overall smoothness of sliding and service life of the device.

[0026] 2. In this invention, by setting up a connection structure, a stable connection between the connector and the sleeve, and between the connector and the slide rod can be quickly achieved, avoiding the problems of cumbersome operation and inconvenient disassembly caused by bolt tightening or welding in traditional connection methods.

[0027] 3. In this invention, by setting up a safety structure, it is possible to conveniently provide safety during the use of the device, effectively preventing the slide bar from sliding unexpectedly due to accidental force during use, thereby significantly improving the overall safety and stability of the device during use, and avoiding operational risks and equipment damage problems that may be caused by component displacement. Attached Figure Description

[0028] Figure 1 A three-dimensional structural diagram of a double-tube self-locking gas spring is provided for this invention. Figure 2 A schematic diagram of the lubrication structure of a double-tube self-locking gas spring is provided for this invention. Figure 3This invention provides a schematic diagram of the connection structure of a double-tube self-locking gas spring; Figure 4 This invention proposes a double-tube self-locking gas spring. Figure 3 Enlarged view of point A; Figure 5 A schematic diagram of a safety structure for a double-tube self-locking gas spring is provided for this invention. Figure 6 This invention proposes a double-tube self-locking gas spring. Figure 5 A schematic diagram of the internal structure.

[0029] Legend: 1. Sleeve; 2. Slide rod; 3. Connector; 4. Connecting piece; 5. Lubrication structure; 51. Outer shell; 52. Anti-slip ring; 53. Oil groove; 54. Groove; 55. Plug; 56. Auxiliary groove; 57. Lubrication pad; 58. Slot; 59. Connecting groove; 6. Connecting structure; 61. Connecting block; 62. Friction ring; 63. Slot; 64. Connecting frame; 65. Fixing groove; 66. Slide groove; 67. Spring; 68. Positioning rod; 69. Mounting groove; 7. Safety structure; 71. Connecting plate; 72. Connecting plate; 73. Sleeve rod; 74. Round rod; 75. Positioning groove; 76. Connecting ring. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0031] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0032] Example 1, such as Figure 1-6 As shown, the present invention provides a double-tube self-locking gas spring, including a sleeve 1, a lubrication structure 5, a connecting structure 6, and a safety structure 7. A slide rod 2 is installed on the inner wall of the sleeve 1. A connector 4 is provided at the end of the sleeve 1 away from the slide rod 2. A connector 3 is provided at the end of the slide rod 2 away from the sleeve 1. Both the connector 3 and the connector 4 are connected to the slide rod 2 and the sleeve 1 respectively by means of the connecting structure 6. The upper end of the sleeve 1 is provided with the lubrication structure 5. The ends of the sleeve 1 and the slide rod 2 away from each other are provided with the connecting structure 6. The arc surface of the sleeve 1 is provided with the safety structure 7.

[0033] The specific settings and functions of its lubrication structure 5, connection structure 6, and safety structure 7 will be discussed below.

[0034] like Figure 1 and Figure 2 As shown, the lubrication structure 5 includes a housing 51, which is fixedly connected to the sleeve 1. An oil groove 53 is provided on the inner wall of the housing 51, and several slots 54 are provided on the inner wall of the oil groove 53. A connecting groove 59 is provided on the inner wall of the housing 51, and a plug 55 is interference-fitted to the inner wall of the connecting groove 59. A lubricating pad 57 is fixedly connected to the inner wall of the housing 51. Two retaining grooves 58 are provided on the inner wall of the housing 51, and anti-slip rings 52 are engaged on the inner wall of the retaining grooves 58. When lubrication of the device is required, simply open the plug 55 on the outer casing 51 and inject lubricating oil into the oil groove 53 through the connecting groove 59. The lubricating oil will evenly penetrate onto the lubricating pad 57 along the groove opening 54 on the inner wall of the oil groove 53. The lubricating pad 57 is in close contact with the outer wall of the slide rod 2. When the slide rod 2 slides in the sleeve 1, the lubricating pad 57 can continuously lubricate the surface of the slide rod 2, effectively reducing the friction between the slide rod 2 and the sleeve 1. At the same time, the anti-slip ring 52 in the slot 58 can prevent lubricating oil from leaking from the connection between the outer casing 51 and the sleeve 1, ensuring a long-lasting and stable lubrication effect, avoiding the problem of the slide rod 2 getting stuck or aggravated wear due to untimely lubrication, and improving the overall smoothness of sliding and service life of the device. The anti-slip ring 52 has a circular cross-section and is made of rubber. The rubber material not only increases the friction between the plug 55 and the lubricating structure 5, preventing accidental detachment during use and ensuring the sealing of the lubrication structure 5, thus preventing lubricating oil leakage from the connecting groove 59, but also possesses a certain degree of elasticity, allowing it to better conform to the inner wall shape of the connecting groove 59, further enhancing the sealing effect and extending the service life of the lubrication structure 5. Several auxiliary grooves 56 are evenly distributed on the arc-shaped surface of the plug 55. These auxiliary grooves 56 increase the friction between the hand and the plug 55, preventing slippage when pulling the plug 55. The lubrication pad 57 has an arc-shaped cross-section and is made of sponge. The sponge material can fully absorb and slowly release lubricating oil, thus continuously lubricating the contact area between the slide rod 2 and the sleeve 1, effectively reducing frictional wear between components and extending the service life of the device. Simultaneously, the arc-shaped cross-section design allows the lubrication pad 57 to better conform to the surface of the slide rod 2, ensuring uniform and comprehensive lubrication.

[0035] like Figure 3 and Figure 4As shown, the connecting structure 6 includes connecting blocks 61. Two connecting blocks 61 are fixedly connected to the slide rod 2 and the sleeve 1 respectively. A connecting frame 64 is slidably connected to the arc surface of the connecting block 61. Two sliding grooves 66 are opened on the inner wall of the connecting frame 64. A fixing groove 65 is opened on the inner wall of the connecting block 61. A locking block 63 is slidably connected to the inner wall of the sliding groove 66. A spring 67 is installed inside the sliding groove 66. The two ends of the spring 67 are fixedly connected to the locking block 63 and the sliding groove 66 respectively. The locking block 63 is fixedly connected to the fixing groove 65. The two connecting frames 64 are fixedly connected to the connecting piece 3 and the connecting piece 4 respectively. When it is necessary to connect the connector 4 and the connecting piece 3 to the device, the connecting frame 64 is fitted onto the arc surface of the connecting block 61, and the locking block 63 is locked into the fixing groove 65 on the inner wall of the connecting block 61 under the elastic force of the spring 67. This quickly achieves a stable connection between the connector 4 and the sleeve 1, and between the connecting piece 3 and the slide rod 2, avoiding the problems of cumbersome operation and inconvenient disassembly caused by bolt tightening or welding in traditional connection methods. This improves the convenience of device assembly and maintenance, while ensuring the structural strength and stability of the connection part and ensuring the effective transmission of force during the connection process. Several friction rings 62 are fixedly connected to the arc surface of the connecting block 61, and several mounting grooves 69 are opened on the inner wall of the connecting frame 64. The mounting grooves 69 are engaged with the friction rings 62. The mounting groove 69 and friction ring 62 increase the friction between the connecting block 61 and the connecting frame 64, further improving the stability of the connecting structure 6 and preventing loosening due to vibration or external force during connection. This ensures that the connecting frame 64 and the connecting block 61 always maintain a stable connection, thereby guaranteeing the structural reliability of the entire double-tube self-locking gas spring during use. A positioning rod 68 is fixedly connected inside the slide groove 66, and the positioning rod 68 is slidably connected to the locking block 63. The spring 67 is fitted onto the arc surface of the positioning rod 68. The positioning rod 68 limits the movement of the spring 67, preventing deformation during use and improving its service life.

[0036] like Figure 5 and Figure 6As shown, the safety structure 7 includes a connecting plate 72, which is fixedly connected to the sleeve 1. A sleeve rod 73 is fixedly connected to the upper surface of the connecting plate 72. A round rod 74 is slidably connected to the inner wall of the sleeve rod 73. A connecting plate 71 is fixedly connected to the upper end of the round rod 74. The connecting plate 71 is fixedly connected to the slide rod 2. Several positioning grooves 75 are opened on the inner wall of the sleeve rod 73. Several connecting rings 76 are fixedly connected to the arc surface at the lower end of the round rod 74. The connecting rings 76 abut against the positioning grooves 75. When increased safety is required for the device, the sliding of the round rod 74 on the inner wall of the sleeve rod 73 causes the connecting plate 71 and the slide rod 2 to move synchronously. Once the slide rod 2 reaches the appropriate position, the contact between the connecting ring 76 and the corresponding positioning groove 75 securely limits its position, effectively preventing unexpected sliding due to unforeseen forces during use. This significantly improves the overall safety and stability of the device, avoiding operational risks and equipment damage caused by component displacement. The connecting ring 76 has a circular cross-section and is made of silicone. The silicone material increases the friction between the round rod 74 and the sleeve rod 73, preventing resistance during sliding and greatly enhancing the safety of the device.

[0037] The overall working principle is as follows: when lubrication is required, simply open the plug 55 on the outer casing 51 and inject lubricating oil into the oil groove 53 through the connecting groove 59. The lubricating oil will evenly penetrate onto the lubrication pad 57 along the groove opening 54 on the inner wall of the oil groove 53. The lubrication pad 57 is in close contact with the outer wall of the slide rod 2. When the slide rod 2 slides in the sleeve 1, the lubrication pad 57 can continuously lubricate the surface of the slide rod 2, effectively reducing the friction between the slide rod 2 and the sleeve 1. At the same time, the anti-slip ring 52 in the slot 58 can prevent lubricating oil from leaking from the connection between the outer casing 51 and the sleeve 1, ensuring a long-lasting and stable lubrication effect and avoiding problems such as the slide rod 2 getting stuck or aggravated wear due to untimely lubrication, thus improving the overall sliding performance of the device. For smooth operation and long service life, the rubber material not only increases the friction between the rubber and the stopper 55, preventing the stopper 55 from accidentally falling off during use and ensuring the sealing of the lubrication structure 5, thus preventing lubricating oil leakage from the connecting groove 59, but also has a certain degree of elasticity, which can better adapt to the inner wall shape of the connecting groove 59, further improving the sealing effect and extending the service life of the lubrication structure 5. The auxiliary groove 56 can increase the friction between the hand and the stopper 55, preventing slippage when pulling the stopper 55. The sponge material can fully absorb lubricating oil and release it slowly, thereby continuously lubricating the contact area between the slide rod 2 and the sleeve 1, effectively reducing frictional wear between components and extending the service life of the device. At the same time, the arc-shaped cross-section design allows the lubrication pad 57 to better fit the surface of the slide rod 2, ensuring uniform and comprehensive lubrication.

[0038] When it is necessary to connect the connector 4 and the connecting piece 3 to the device, the connecting frame 64 is fitted onto the arc surface of the connecting block 61, and the locking block 63 is locked into the fixing groove 65 on the inner wall of the connecting block 61 under the elastic force of the spring 67. This quickly achieves a stable connection between the connector 4 and the sleeve 1, and between the connecting piece 3 and the slide rod 2, avoiding the problems of cumbersome operation and inconvenient disassembly caused by bolt tightening or welding in traditional connection methods. This improves the convenience of device assembly and maintenance, while ensuring the structural strength and stability of the connection part and ensuring the effective transmission of force during the connection process. The mounting groove 69 and the friction ring 62 can increase the friction between the connecting block 61 and the connecting frame 64, further improving the stability of the connection structure 6 and preventing the connection from loosening due to vibration or external force during the connection process. This ensures that the connecting frame 64 and the connecting block 61 always maintain a stable connection state, thereby ensuring the structural reliability of the entire double-tube self-locking gas spring during use. The positioning rod 68 can limit the spring 67 to prevent the spring 67 from deforming during use and improve the service life of the spring 67.

[0039] When increased safety is required for the device, the sliding of the round rod 74 on the inner wall of the sleeve rod 73 can drive the connecting plate 71 and the slide rod 2 to move synchronously. When the slide rod 2 moves to the appropriate position, the contact between the connecting ring 76 and the corresponding positioning groove 75 can securely limit the position of the slide rod 2, effectively preventing the slide rod 2 from sliding unexpectedly due to accidental force during use. This significantly improves the overall safety and stability of the device and avoids operational risks and equipment damage caused by component displacement. The silicone material can increase the friction between the round rod 74 and the sleeve rod 73, preventing the round rod 74 and the sleeve rod 73 from sliding and generating resistance, greatly improving the safety of the device.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A double-tube self-locking gas spring, comprising a sleeve (1), a lubrication structure (5), a connecting structure (6), and a safety structure (7), characterized in that: The inner wall of the sleeve (1) is equipped with a slide rod (2). A connector (4) is provided at the end of the sleeve (1) away from the slide rod (2). A connector (3) is provided at the end of the slide rod (2) away from the sleeve (1). The connector (3) and the connector (4) are connected to the slide rod (2) and the sleeve (1) respectively by means of a connecting structure (6). A lubrication structure (5) is provided at the upper end of the sleeve (1).

2. The double-tube self-locking gas spring according to claim 1, characterized in that: The lubrication structure (5) includes a housing (51), which is fixedly connected to the sleeve (1). The inner wall of the housing (51) is provided with an oil groove (53), and the inner wall of the oil groove (53) is provided with a plurality of slots (54). The inner wall of the housing (51) is provided with a connecting groove (59), and the inner wall of the connecting groove (59) is interference-fitted with a plug (55). The inner wall of the housing (51) is fixedly connected with a lubricating pad (57). The inner wall of the housing (51) is provided with two slots (58), and the inner wall of the slots (58) is fitted with an anti-slip ring (52).

3. A double-tube self-locking gas spring according to claim 2, characterized in that: The anti-slip ring (52) has a circular cross-section and is a rubber ring.

4. A double-tube self-locking gas spring according to claim 2, characterized in that: The plug (55) has several auxiliary grooves (56) on its arc surface, and the several auxiliary grooves (56) are evenly distributed on the plug (55).

5. A double-tube self-locking gas spring according to claim 2, characterized in that: The cross-section of the lubricating pad (57) is arc-shaped, and the lubricating pad (57) is a sponge pad.

6. A double-tube self-locking gas spring according to claim 1, characterized in that: The sleeve (1) and the slide rod (2) are provided with a connecting structure (6) at their respective ends. The connecting structure (6) includes a connecting block (61). The two connecting blocks (61) are fixedly connected to the slide rod (2) and the sleeve (1) respectively. The arc surface of the connecting block (61) is slidably connected to a connecting frame (64). The inner wall of the connecting frame (64) has two sliding grooves (66). The inner wall of the connecting block (61) has a fixing groove (65). The inner wall of the sliding groove (66) is slidably connected to a locking block (63). The inside of the sliding groove (66) is provided with a spring (67). The two ends of the spring (67) are fixedly connected to the locking block (63) and the sliding groove (66) respectively. The locking block (63) is fixedly connected to the fixing groove (65). The two connecting frames (64) are fixedly connected to the connecting piece (3) and the connecting piece (4) respectively.

7. A double-tube self-locking gas spring according to claim 6, characterized in that: The arc surface of the connecting block (61) is fixedly connected with several friction rings (62), and the inner wall of the connecting frame (64) is provided with several mounting grooves (69), which are engaged with the friction rings (62).

8. A double-tube self-locking gas spring according to claim 6, characterized in that: A positioning rod (68) is fixedly connected inside the slide groove (66). The positioning rod (68) is slidably connected to the locking block (63). The spring (67) is sleeved on the arc surface of the positioning rod (68).

9. A double-tube self-locking gas spring according to claim 1, characterized in that: The sleeve (1) has a safety structure (7) on its arc surface. The safety structure (7) includes a connecting plate (72) which is fixedly connected to the sleeve (1). A sleeve rod (73) is fixedly connected to the upper surface of the connecting plate (72). A round rod (74) is slidably connected to the inner wall of the sleeve rod (73). A connecting plate (71) is fixedly connected to the upper end of the round rod (74). The connecting plate (71) is fixedly connected to the slide rod (2). A number of positioning grooves (75) are opened on the inner wall of the sleeve rod (73). A number of connecting rings (76) are fixedly connected to the arc surface of the lower end of the round rod (74). The connecting rings (76) abut against the positioning grooves (75).

10. A double-tube self-locking gas spring according to claim 9, characterized in that: The connecting ring (76) has a circular cross-section and is a silicone ring.

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