A portable gas cylinder guard

Abstract

The utility model relates to gas cylinder protection device technical field discloses a movable gas cylinder protection device, including fixed plate, the upper end surface fixed connection of fixed plate has gas cylinder fixed establishment, the lower end surface fixed connection of fixed plate has movable type adjusting mechanism, the gas cylinder fixed establishment includes sealing cover, the upper end surface fixed connection of fixed plate has the frame of keeping. In the utility model, through setting up the gas cylinder fixed establishment, the up and down clamping ring two -way fixed gas cylinder restricts the shaking displacement, and multiple locking structure makes sealing cover and frame of keeping connect firm, convenient operation and can all -round protection gas cylinder, avoid the collision damage or leakage, can switch the telescopic state of universal wheel fast through the movable type adjusting mechanism that sets up, realize the convenient switching of device flexible movement and stable fixed, reduce the transportation labor intensity, adapt to different scenes, buffer spring still can absorb the jolt impact force protection gas cylinder, satisfy the safety protection demand of gas cylinder under all kinds of scenes.

Description

Technical Field

[0001] This utility model relates to the technical field of gas cylinder protection devices, and in particular to a movable gas cylinder protection device. Background Technology

[0002] In the storage and transportation of gas cylinders, it is necessary to securely fix the gas cylinders to prevent collisions and leaks, while also taking into account the need for flexible movement and stable stationary placement of the equipment.

[0003] Existing gas cylinder protection devices lack dedicated gas cylinder fixing mechanisms, and gas cylinders are mostly simply placed or loosely tied, which makes them prone to shaking and tipping during storage and transportation, posing safety hazards such as collision damage or leakage. Furthermore, due to the lack of flexible and movable adjustment mechanisms, they are either fixed and cannot be moved, or they are difficult to stabilize after being moved, resulting in high labor intensity and low efficiency during transportation, and they cannot adapt to the usage needs of different scenarios.

[0004] Therefore, those skilled in the art have provided a movable gas cylinder protection device to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies and provide a movable gas cylinder protection device. Through a gas cylinder fixing mechanism, upper and lower clamping rings fix the gas cylinder in both directions, limiting its movement and displacement. A multi-locking structure ensures a secure connection between the sealing cap and the storage frame. This device is easy to operate and provides all-around protection for the gas cylinder, preventing damage or leakage from collisions. Simultaneously, a movable adjustment mechanism allows for quick switching between the extension and retraction of the casters, enabling convenient switching between flexible movement and stable fixation. This reduces labor intensity during transport and adapts to different scenarios. The buffer spring also absorbs the impact of bumps, protecting the gas cylinder. These two features work together to give the device the advantages of reliable gas cylinder fixation, flexible movement, and stable storage, significantly improving the safety and convenience of gas cylinder storage and transport, and meeting the safety protection needs of gas cylinders in various scenarios.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A movable gas cylinder protection device includes a fixing plate, a gas cylinder fixing mechanism is fixedly connected to the upper end face of the fixing plate, and a movable adjustment mechanism is fixedly connected to the lower end face of the fixing plate. The gas cylinder fixing mechanism includes a sealing cap, a storage frame is fixedly connected to the upper end face of the fixing plate, a plurality of lower clamping rings are fixedly connected to the lower inner wall of the storage frame, a plurality of upper clamping rings are fixedly connected to the lower end face of the sealing cap, and the lower end face of the sealing cap is fitted to the upper end face of the storage frame. The above technical solution provides storage space for gas cylinders through the storage frame, supports and clamps the bottom of the gas cylinder with the lower clamping ring, and after the sealing cap is closed, the upper clamping ring and the lower clamping ring cooperate to achieve bidirectional clamping of the upper and lower ends of the gas cylinder, restricting the shaking of the gas cylinder. At the same time, the sealing cap fits snugly with the storage frame to enhance protection.

[0007] Furthermore, the movable adjustment mechanism includes a mounting groove, which is opened on the lower end face of the fixed plate. An auxiliary frame is fixedly fitted inside the mounting groove. An auxiliary opening is opened on the lower end face of the auxiliary frame. A rotating rod is rotatably connected between the inner walls on both sides of the auxiliary opening at the upper part. Multiple cams are fixedly fitted on the outer wall of the rotating rod. Buffer grooves are opened on the inner walls on both sides of the auxiliary opening at the lower part. Fixed sliding rods are fixedly connected between the upper and lower inner walls of the two buffer grooves. Buffer springs are movably fitted on the lower outer walls of the two fixed sliding rods. Movable sleeves are movably fitted on the upper outer walls of the two fixed sliding rods. A connecting plate is fixedly connected between the two movable sleeves. Multiple universal wheels are fixedly connected to the lower end face of the connecting plate. Multiple fixed pads are fixedly connected to the upper end face of the connecting plate. The cams and fixed pads are pressed together. With the above technical solution, the auxiliary frame is fixed to the fixed plate through the mounting groove. The rotating rod drives the cam to rotate, which squeezes the fixed pad and pushes the connecting plate to move. The moving sleeve slides along the fixed slide rod to ensure stability. The buffer spring provides buffering force. The universal wheel extends and retracts through the auxiliary port to realize the switching between moving and fixed of the device.

[0008] Furthermore, a drive motor is fixedly connected to one outer wall of the auxiliary frame, and the output end of the drive motor passes through the auxiliary frame into the interior and is fixedly connected to the rotating rod. The above technical solution uses a drive motor to rotate a rotating rod, replacing the manual drive of the cam, to achieve automated control of the extension and retraction of the caster wheels, improving ease of operation and reducing manual labor intensity.

[0009] Furthermore, when the device moves, the caster wheel is movably mounted at the lower end of the auxiliary frame and the buffer spring is in a compressed state; when the device is fixed, the caster wheel is movably mounted inside the auxiliary frame and the buffer spring is in a naturally popped-out state. The above technical solution ensures stability in both states by having the casters extend to contact the ground when the device is in motion, and the buffer springs compress to absorb bumps; and by having the casters retract and the buffer springs reset to allow the auxiliary frame to contact the ground when the device is fixed.

[0010] Furthermore, limiting strips are fixedly connected to both sides of the lower end face of the sealing cover, and limiting posts are fixedly connected to the upper part of both outer walls of the storage frame. The upper end faces of the two limiting posts are provided with assembly openings, and the limiting strips are engaged and set in the assembly openings. The above technical solution restricts the horizontal displacement of the sealing cover by inserting the limiting strip into the assembly port of the limiting post, ensuring that the upper clamping ring and the lower clamping ring are precisely aligned, thus laying the foundation for subsequent locking.

[0011] Furthermore, a limiting plate is fixedly connected to the lower end face of the limiting strip, and a limiting groove is formed on the lower inner wall of the assembly port, with the limiting plate engaging in the limiting groove. The above technical solution uses a limiting plate that engages with a limiting slot to create a vertical limit, preventing the sealing cap from accidentally falling off and further improving the stability of the gas cylinder clamping.

[0012] Furthermore, the front and rear ends of the limiting strip are provided with adjustment grooves, the rear inner wall of the adjustment groove is fixedly connected with a return spring, the front end of the return spring is fixedly connected with a movable seat, the front end of the movable seat is fixedly connected with a locking rod, the front and rear ends of the limiting post are provided with locking holes, the locking holes are connected to the assembly port, and the locking rod is locked in the locking hole. The above technical solution uses a reset spring in the adjustment slot to drive the moving seat to engage the locking rod into the locking hole, achieving a detachable rigid lock and ensuring that the sealing cap does not loosen during the storage and transportation of the gas cylinder.

[0013] Furthermore, the upper and lower end faces of the movable seat are fixedly connected to limit sliders, and the inner walls of the upper and lower ends of the adjustment groove are provided with limit grooves, and the limit sliders are slidably disposed in the limit grooves. The above technical solution restricts the movement trajectory of the moving seat by sliding the limiting slider along the limiting groove, thus preventing the locking rod from deviating and failing to accurately engage or disengage from the locking hole, thereby improving the reliability of locking and unlocking.

[0014] This utility model has the following beneficial effects: 1. This utility model proposes a movable gas cylinder protection device, which solves the problems of unstable fixing and easy tipping and collision during traditional gas cylinder storage by adding a gas cylinder fixing mechanism. Specifically, the upper and lower clamping rings clamp the gas cylinder to form a two-way fixation, effectively limiting the shaking and displacement of the gas cylinder during storage and transportation, avoiding the risk of gas cylinder collision damage or leakage. The dual positioning of the limiting strip and the assembly port, and the limiting plate and the limiting slot, combined with the locking structure of the locking rod and the locking hole, make the sealing cap and the storage frame firmly connected, preventing accidental detachment and further improving the reliability of gas cylinder fixing. Moreover, the locking process does not require additional tools, and the elasticity of the return spring can complete the automatic locking, which is convenient and efficient to operate. At the same time, it is easy to quickly open and retrieve the gas cylinder. The overall structure provides all-round protection for the gas cylinder, reducing the impact of the external environment on the gas cylinder, and is suitable for the safe storage needs of various gas cylinders.

[0015] 2. This utility model proposes a movable gas cylinder protection device. By adding a movable adjustment mechanism, it solves the problems of inconvenient movement and unstable fixation of traditional gas cylinder protection devices. The universal wheels can be quickly switched between extension and retraction states via a drive motor, enabling flexible movement of the device without manual handling. This significantly reduces the labor intensity of gas cylinder transportation and improves transportation efficiency. The universal wheels have omnidirectional movement capabilities, making it easy to adjust the device's position in confined spaces and adapt to different usage scenarios. When the device is fixed, the universal wheels retract inward, and the auxiliary frame directly contacts the ground, resulting in a larger contact area and more stable placement. This prevents the device from shifting due to the universal wheels rolling during transportation. Furthermore, the buffer spring can absorb the impact of road bumps during movement, reducing the impact of vibration on the gas cylinder and protecting the structural integrity of the gas cylinder. The overall structure allows for convenient switching between movement and fixation, balancing transportation flexibility and storage stability, and ensuring safety throughout the entire process of gas cylinder use.

[0016] 3. This utility model proposes a movable gas cylinder protection device. Through the gas cylinder fixing mechanism, the upper and lower clamping rings fix the gas cylinder in both directions, limiting shaking and displacement. The multiple locking structure ensures a firm connection between the sealing cap and the storage frame. It is easy to operate and can protect the gas cylinder in all directions, avoiding collision damage or leakage. At the same time, through the movable adjustment mechanism, the universal wheel extension state can be quickly switched, realizing the convenient switching between flexible movement and stable fixation of the device, reducing the labor intensity of transportation and adapting to different scenarios. The buffer spring can also absorb the impact force of bumps to protect the gas cylinder. The two work together to give the device the advantages of reliable gas cylinder fixation, flexible movement, and stable storage, greatly improving the safety and convenience of gas cylinder storage and transportation, and meeting the safety protection needs of gas cylinders in various scenarios. Attached Figure Description

[0017] Figure 1 This is an axonometric view of a movable gas cylinder protection device proposed in this utility model; Figure 2 This is an axial side view of the connection between the sealing cap and the upper clamping ring of a movable gas cylinder protection device proposed in this utility model; Figure 3 This is a front sectional view of a movable gas cylinder protection device proposed in this utility model; Figure 4 This is a side sectional view of the connection between the sealing cap and the limiting strip of a movable gas cylinder protective device proposed in this utility model. Figure 5 for Figure 4 An enlarged schematic diagram of the structure at point A; Figure 6 for Figure 3 An enlarged schematic diagram of the structure at point B.

[0018] Explanation of reference numerals in the attached figures: 1. Fixing plate; 2. Gas cylinder fixing mechanism; 201. Storage frame; 202. Lower clamping ring; 203. Sealing cap; 204. Upper clamping ring; 205. Limiting post; 206. Limiting strip; 207. Assembly port; 208. Limiting plate; 209. Limiting slot; 210. Adjustment slot; 211. Return spring; 212. Moving seat; 213. Engaging rod; 214. Engaging hole; 215. Limiting slider; 216. Limiting slide groove; 3. Movable adjustment mechanism; 301. Mounting slot; 302. Auxiliary frame; 303. Auxiliary port; 304. Rotating rod; 305. Drive motor; 306. Cam; 307. Buffer slot; 308. Fixed slide rod; 309. Buffer spring; 310. Moving sleeve; 311. Connecting plate; 312. Fixing pad; 313. Casters. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This utility model provides a specific embodiment: a movable gas cylinder protection device, including a fixing plate 1, a gas cylinder fixing mechanism 2 fixedly connected to the upper end face of the fixing plate 1, and a movable adjustment mechanism 3 fixedly connected to the lower end face of the fixing plate 1. The gas cylinder fixing mechanism 2 includes a sealing cap 203. A storage frame 201 is fixedly connected to the upper end face of the fixing plate 1. Multiple lower clamping rings 202 are fixedly connected to the lower inner wall of the storage frame 201. Multiple upper clamping rings 204 are fixedly connected to the lower end face of the sealing cap 203. The lower end face of the sealing cap 203 fits snugly against the upper end face of the storage frame 201. The storage frame 201 provides storage space for the gas cylinder. The lower clamping rings 202 support and clamp the bottom of the gas cylinder. After the sealing cap 203 is closed, the upper clamping rings 204 cooperate with the lower clamping rings 202 to achieve bidirectional clamping of the upper and lower ends of the gas cylinder, limiting the shaking of the gas cylinder. At the same time, the sealing cap 203 and the storage frame 201 fit together more tightly. For protection, limiting strips 206 are fixedly connected to both sides of the lower end face of the sealing cover 203, and limiting posts 205 are fixedly connected to the upper part of the outer walls on both sides of the storage frame 201. Each limiting post 205 has an assembly opening 207 on its upper end face. The limiting strips 206 are engaged within the assembly openings 207. By engaging the limiting strips 206 within the assembly openings 207 of the limiting posts 205, the horizontal displacement of the sealing cover 203 is restricted, ensuring precise correspondence between the upper clamping ring 204 and the lower clamping ring 202, laying the foundation for subsequent locking. A limiting plate 208 is fixedly connected to the lower end face of the limiting strips 206, and a limiting groove 209 is formed on the lower inner wall of the assembly opening 207. The 8-clamping mechanism is set within the limiting groove 209. The limiting plate 208 engages with the limiting groove 209, forming a vertical limit to prevent the sealing cap 203 from accidentally falling off, further improving the stability of the gas cylinder clamping. The front and rear ends of the limiting strip 206 are each provided with an adjustment groove 210. A return spring 211 is fixedly connected to the inner rear wall of the adjustment groove 210. A movable seat 212 is fixedly connected to the front end of the return spring 211. A clamping rod 213 is fixedly connected to the front end of the movable seat 212. The front and rear ends of the limiting post 205 are each provided with a clamping hole 214. The clamping hole 214 communicates with the assembly opening 207, and the clamping rod 213 engages within the clamping hole 214. The moving seat 212 is driven by the reset spring 211 in the adjusting groove 210, which drives the locking rod 213 to engage with the locking hole 214, thereby achieving a detachable rigid lock and ensuring that the sealing cap 203 does not loosen during the storage and transportation of the gas cylinder. The upper and lower end faces of the moving seat 212 are fixedly connected to the limit slider 215, and the upper and lower end inner walls of the adjusting groove 210 are provided with limit grooves 216. The limit slider 215 is slidably set in the limit groove 216. By sliding the limit slider 215 along the limit groove 216, the movement trajectory of the moving seat 212 is restricted, so as to prevent the locking rod 213 from deviating and failing to accurately engage or disengage from the locking hole 214, thereby improving the reliability of locking and unlocking. Reference Figure 1 , Figure 3 and Figure 6The movable adjustment mechanism 3 includes a mounting groove 301, which is located on the lower end face of the fixed plate 1. An auxiliary frame 302 is fixedly fitted inside the mounting groove 301. An auxiliary opening 303 is provided on the lower end face of the auxiliary frame 302. A rotating rod 304 is rotatably connected between the upper part of the inner walls on both sides of the auxiliary opening 303. Multiple cams 306 are fixedly fitted on the outer wall of the rotating rod 304. Buffer grooves 307 are provided on the lower part of the inner walls on both sides of the auxiliary opening 303. Fixed sliding rods 308 are fixedly connected between the upper and lower inner walls of the two buffer grooves 307. A buffer spring 309 is movably fitted onto the lower part of the outer wall of each fixed slide rod 308. A movable sleeve 310 is movably fitted onto the upper part of the outer wall of each of the two fixed slide rods 308. A connecting plate 311 is fixedly connected between the two movable sleeves 310. Multiple universal wheels 313 are fixedly connected to the lower end face of the connecting plate 311, and multiple fixing pads 312 are fixedly connected to the upper end face of the connecting plate 311. The cam 306 is pressed against the fixing pads 312 and fixed to the fixed plate 1 through the mounting groove 301 via the auxiliary frame 302. The rotating rod 304 drives the cam 306 to rotate. The compression fixing pad 312 pushes the connecting plate 311 to move, the moving sleeve 310 slides along the fixed slide rod 308 to ensure stability, the buffer spring 309 provides buffering force, and the universal wheel 313 switches between moving and fixed modes through the auxiliary port 303. A drive motor 305 is fixedly connected to one outer wall of the auxiliary frame 302. The output end of the drive motor 305 passes through the auxiliary frame 302 to the inside and is fixedly connected to the rotating rod 304. The drive motor 305 drives the rotating rod 304 to rotate, replacing the manual drive cam 306, and realizes the extension and retraction of the universal wheel 313. The automated control enhances ease of operation and reduces manual labor intensity. When the device moves, the caster wheel 313 is movably positioned at the lower end of the auxiliary frame 302 and the buffer spring 309 is in a compressed state. When the device is fixed, the caster wheel 313 is movably positioned inside the auxiliary frame 302 and the buffer spring 309 is in a naturally extended state. When moving, the caster wheel 313 extends to contact the ground, and the buffer spring 309 is compressed to absorb bumps. When fixed, the caster wheel 313 retracts, and the buffer spring 309 resets to allow the auxiliary frame 302 to contact the ground, ensuring stability in both states.

[0021] Working Principle: This device uses a fixed plate 1 as the basic carrier and a gas cylinder fixing mechanism 2 to securely clamp the gas cylinder. A movable adjustment mechanism 3 allows for flexible switching between movement and fixing, ensuring safe storage and transportation of the gas cylinder. When fixing the gas cylinder, place it in the storage frame 201, ensuring the bottom of the cylinder is in contact with the lower clamping ring 202. Close the sealing cap 203, allowing the upper clamping ring 204 to contact the top of the cylinder. At this time, the limiting strip 206 engages with the assembly port 207 of the limiting post 205, and the limiting plate 208 simultaneously engages with the limiting slot 209 for initial positioning. The return spring 211 in the adjusting groove 210 drives the moving seat 212, causing the locking rod 213 to extend and engage with the locking hole 214 of the limiting post 205 to complete the locking. The limiting slider 215 moves along the limiting groove 215. 16. The sliding mechanism ensures precise engagement. When movement is required, the drive motor 305 is activated to rotate the rotating rod 304, causing the protruding end of the cam 306 in the auxiliary frame 302 to press against the fixing pad 312 of the connecting plate 311, pushing the connecting plate 311 downward. The moving sleeve 310 slides along the fixed slide rod 308 and compresses the buffer spring 309, causing the universal wheel 313 to extend out of the auxiliary opening 303 and contact the ground, thus propelling the device to move. The buffer spring 309 absorbs the impact of bumps. When fixation is required, the drive motor 305 drives the cam 306 to rotate in the opposite direction, causing the protruding end to disengage from the fixing pad 312. The buffer spring 309 resets and pushes the connecting plate 311 upward, causing the universal wheel 313 to retract into the auxiliary frame 302. The lower end of the auxiliary frame 302 contacts the ground, achieving stable stationary position.

[0022] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0023] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A movable gas cylinder protection device, comprising a fixing plate (1), characterized in that: A gas cylinder fixing mechanism (2) is fixedly connected to the upper end face of the fixing plate (1), and a movable adjustment mechanism (3) is fixedly connected to the lower end face of the fixing plate (1). The gas cylinder fixing mechanism (2) includes a sealing cap (203), a storage frame (201) is fixedly connected to the upper end face of the fixing plate (1), a plurality of lower clamping rings (202) are fixedly connected to the lower inner wall of the storage frame (201), a plurality of upper clamping rings (204) are fixedly connected to the lower end face of the sealing cap (203), and the lower end face of the sealing cap (203) is fitted to the upper end face of the storage frame (201).

2. The movable gas cylinder protection device according to claim 1, characterized in that: The movable adjustment mechanism (3) includes a mounting groove (301) located on the lower end face of the fixed plate (1). An auxiliary frame (302) is fixedly fitted inside the mounting groove (301). An auxiliary opening (303) is provided on the lower end face of the auxiliary frame (302). A rotating rod (304) is rotatably connected between the inner walls of the two sides of the auxiliary opening (303) at the upper part. Multiple cams (306) are fixedly fitted on the outer wall of the rotating rod (304). Buffer grooves (307) are provided on the lower part of the inner walls of the two sides of the auxiliary opening (303). The two buffer grooves (307) are... Fixed slide rods (308) are fixedly connected between the upper and lower inner walls. Buffer springs (309) are movably sleeved on the lower outer walls of the two fixed slide rods (308). Movable sleeves (310) are movably sleeved on the upper outer walls of the two fixed slide rods (308). A connecting plate (311) is fixedly connected between the two movable sleeves (310). Multiple universal wheels (313) are fixedly connected to the lower end face of the connecting plate (311). Multiple fixed pads (312) are fixedly connected to the upper end face of the connecting plate (311). The cam (306) is pressed against the fixed pads (312).

3. A portable gas cylinder protection device according to claim 2, characterized in that: A drive motor (305) is fixedly connected to one side of the outer wall of the auxiliary frame (302). The output end of the drive motor (305) passes through the auxiliary frame (302) to the interior and is fixedly connected to the rotating rod (304).

4. A portable gas cylinder protection device according to claim 2, characterized in that: When the device moves, the caster wheel (313) is movably positioned at the lower end of the auxiliary frame (302) and the buffer spring (309) is in a compressed state. When the device is fixed, the caster wheel (313) is movably positioned inside the auxiliary frame (302) and the buffer spring (309) is in a naturally popped-out state.

5. A portable gas cylinder protection device according to claim 1, characterized in that: Limiting strips (206) are fixedly connected to both sides of the lower end face of the sealing cover (203), and limiting posts (205) are fixedly connected to the upper part of both sides of the outer wall of the storage frame (201). The upper end face of the two limiting posts (205) is provided with an assembly port (207), and the limiting strips (206) are engaged in the assembly port (207).

6. A portable gas cylinder protection device according to claim 5, characterized in that: The lower end face of the limiting strip (206) is fixedly connected to the limiting plate (208), and the lower inner wall of the assembly port (207) is provided with a limiting groove (209), and the limiting plate (208) is engaged in the limiting groove (209).

7. A portable gas cylinder protection device according to claim 5, characterized in that: The front and rear ends of the limiting strip (206) are provided with adjustment grooves (210). The rear inner wall of the adjustment groove (210) is fixedly connected with a return spring (211). The front end of the return spring (211) is fixedly connected with a moving seat (212). The front end of the moving seat (212) is fixedly connected with a locking rod (213). The front and rear ends of the limiting post (205) are provided with locking holes (214). The locking holes (214) are connected to the assembly port (207). The locking rod (213) is locked in the locking hole (214).

8. A portable gas cylinder protection device according to claim 7, characterized in that: The upper and lower end faces of the movable seat (212) are fixedly connected to the limit slider (215), and the upper and lower inner walls of the adjustment groove (210) are provided with limit grooves (216). The limit slider (215) is slidably disposed in the limit groove (216).

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