An indoor radiator connection structure with a stable structure

Abstract

The present invention relates to the technical field of radiator installation, and specifically relates to an indoor radiator connection structure with a stable structure, including a fixed seat. The left end of the fixed seat is fixedly connected to a transmission box. The left side of the transmission box is provided with a machine body shell. Inside the machine body shell, there is a fixedly connected radiator and a fixing mechanism. The fixing mechanism includes a rotating shaft base. Inside the rotating shaft base, there is a movably connected transmission shaft. On the outer wall of the transmission shaft, there is a fixedly connected driving wheel. Meshed with the outer wall of the driving wheel is a crawler belt. On both sides of the inner wall of the crawler belt, there are meshed driven wheels. On the top of the driven wheels, there is a fixedly connected transmission rod. There is also a rotating mechanism. The rotating mechanism includes a first bevel gear. The inner wall of the first bevel gear is movably connected to the lower part of the outer wall of the left transmission rod. The present invention realizes the quick fixed installation of the radiator, avoids the difficult smooth installation of the radiator caused by the positioning deviation of the fixed seat, and realizes the rotation of the bottom end of the radiator through the rotating mechanism, so that the bottom end of the radiator is far away from the wall, which is convenient for the cleaning and maintenance of the radiator, and improves the convenience and stability of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of radiator installation, and specifically to an indoor radiator connection structure with a stable structure. Background Art

[0002] A radiator is a device for indoor heating, mainly composed of a body shell, radiator fins, connecting pipes, etc. Its working principle is to drain hot water into the interior of multiple radiator fins through the connecting pipes and transfer and release the heat energy in the hot water through the radiator fins. Radiators are mainly used in the north and regions with relatively cold winters. Previously, cast iron radiators were mainly used, but cast iron radiators have the disadvantages of relatively backward appearance aesthetics and difficulty in matching with modern buildings and decorations. Cast iron radiators have gradually withdrawn from the market. New types of radiators such as steel radiators, copper-aluminum composite radiators, and aluminum radiators are superior to cast iron radiators both in terms of material and manufacturing process, and thus have gradually become the most mainstream radiators in the market.

[0003] Before the next heating season arrives, the radiator has been in an idle state. Therefore, it is very necessary to clean and maintain the radiator before heating. For example, check the air release valve, screw plug connected to the radiator and the pipe fittings on the pipeline. If there is any looseness at the threaded connection, it should be tightened to prevent water leakage after heating. The radiator is mainly fixed to the wall by bolts and components of the fixed seat on the back of the body shell, thereby realizing the fixation of the radiator. Before and after the cleaning and maintenance work of the radiator, the radiator needs to be disassembled and assembled. Therefore, there is an urgent need for an indoor radiator connection structure with a stable structure to solve the above problems.

[0004] The existing device mainly fixes and connects the radiator to the wall through bolts and brackets. The prior art is mostly similar to a radiator bracket. The structure of the patent number CN109028273A in the technical field of radiator brackets includes a fixing plate, and a support plate that can move horizontally is provided on the fixing plate. The support plate is perpendicular to the fixing plate. An arc-shaped groove is provided at the upper end of the end of the support plate away from the fixing plate. The support plate of this invention can slide along the fixing plate. After fixing this invention to the wall through the fixing holes on the fixing plate, the support plate can be manually controlled to extend into the gap between the vertical heat dissipation pipes of the radiator, so that when installing the radiator bracket, there is no need to accurately calculate the installation position of each radiator bracket, and the situation of reinstalling the radiator bracket due to inaccurate installation position of the radiator bracket will not occur, greatly improving the installation efficiency of the radiator. However, there are still areas where this device can be optimized.

[0005] 1. The existing device mainly fixes and connects the radiator to multiple fixing seats on the wall through bolts, making it difficult for some radiators to accurately correspond to the fixing seats during installation, resulting in difficulty in quickly completing the installation and fixing of some radiators.

[0006] 2. At the same time, the water inlet and outlet of some devices are mainly installed at the bottom of the radiator, making it difficult for some radiators to connect the inlet and outlet water pipes, resulting in difficulty in cleaning and maintaining some heating pipes, reducing the working efficiency and practicality of the device. Summary of the Invention

[0007] The purpose of the present invention is to provide an indoor radiator connection structure with a stable structure to solve the problems in the above-mentioned background technology. The existing device mainly fixes and connects the radiator to multiple fixing seats on the wall through bolts, making it difficult for some radiators to accurately correspond to the fixing seats during installation, resulting in difficulty in quickly completing the installation and fixing of some radiators. At the same time, the water inlet and outlet of some devices are mainly installed at the bottom of the radiator, making it difficult for some radiators to connect the inlet and outlet water pipes, resulting in difficulty in cleaning and maintaining some heating pipes.

[0008] To achieve the above purpose, the present invention provides the following technical solution: An indoor radiator connection structure with a stable structure, including:

[0009] The ground, above which a wall is fixedly connected. At the four corners on the left side of the wall, there are fixing seats. At the left end of the fixing seat, a transmission box is fixedly connected. On the left side of the transmission box, there is a machine body shell, and inside the machine body shell, a radiator is fixedly connected.

[0010] A fixing mechanism, which includes a rotating shaft base. The bottom of the rotating shaft base is fixedly connected below the wall. Inside the rotating shaft base, a transmission shaft is movably connected. An active wheel is fixedly connected to the outer wall of the transmission shaft between the rotating shaft bases. The bottom end of the transmission shaft passes through the bottom rotating shaft base and is fixedly connected to a grip. The outer wall of the active wheel is meshed with a crawler. On both sides of the inner wall of the crawler, a driven wheel is meshed. The top of the driven wheel is fixedly connected to a transmission rod. The top end of the transmission rod passes through the bottom of the movable box and is movably connected to the inner top of the movable box. A threaded groove is opened on the upper part of the outer wall of the transmission rod. A lifting slider is movably connected to the outer wall of the threaded groove. The side of the lifting slider close to the vertical axis of the machine body shell passes through the transmission box and is fixedly connected to a lifting rod. Below the lifting rod, there is a rotating frame. The top of both sides of the rotating frame is movably connected to the side wall of the transmission box. The lower part of the inner wall of the rotating frame is movably connected to a fixing rod.

[0011] A rotating mechanism, which includes a first bevel gear. The inner wall of the first bevel gear is movably connected to the lower part of the outer wall of the left transmission rod.

[0012] Preferably, an expansion bolt is inserted on the left side of the wall surface. The outer wall of the expansion bolt is inserted into the inner wall of the fixed seat. A fixing bolt is fixedly connected to the left inner wall of the expansion bolt. The fixing bolt fixes the fixed seat on the outer wall of the expansion bolt. The transmission box is fixedly connected to the side wall of the fixed seat in a left-right symmetric manner.

[0013] Preferably, a first threaded hole corresponding to the threaded groove is formed in the inner wall of the lifting slider, and a limiting sliding slot corresponding to the lifting slider is formed above the right side of the transmission box.

[0014] Preferably, a first hook is fixedly connected above the right side of the body shell, and the right side of the first hook is hung on the upper outer wall of the lifting rod.

[0015] Preferably, a movable box is fixedly connected below the right side of the body shell. A limiting rod is fixedly connected to the middle of the interior of the movable box, and a sliding cylinder is movably connected to the outer wall of the limiting rod.

[0016] Preferably, a traction block is fixedly connected to the right side of the sliding cylinder. The right end of the traction block passes through the movable box and is fixedly connected to a second hook. The right side of the second hook is movably connected to the lower outer wall of the fixed rod.

[0017] Preferably, a spring is fixedly connected to the top end of the sliding cylinder. The top end of the spring is fixedly connected to the upper part of the interior of the movable box, and a limiting sliding gap corresponding to the traction block is formed on the right side of the movable box.

[0018] Preferably, a second bevel gear is meshed and connected to the bottom right side of the first bevel gear. A symmetric screw rod is fixedly connected to the right side of the second bevel gear. The right end of the symmetric screw rod passes through the left transmission box and is movably connected to the lower left side of the right transmission box.

[0019] Preferably, rotating sliders are movably connected to both sides of the outer wall of the symmetric screw rod. Second threaded holes corresponding to the symmetric screw rod are formed in the inner walls of the rotating sliders, and a traction rod is movably connected to the top ends of the rotating sliders.

[0020] Preferably, the other end of the traction rod is movably connected to an adjusting block. A fixed shaft is movably connected to the top end of the adjusting block. The top end of the fixed shaft is fixedly connected to the middle of the bottom end of the rotating frame.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The indoor radiator connection structure with a stable structure is provided with a fixing mechanism. The body shell drives the first hook to be hung above the outer wall of the lifting rod, and makes the right side of the movable box lean against the outer wall of the fixed rod. By rotating the handle, the transmission shaft, the driving wheel, the crawler, the driven wheel and the transmission rod rotate synchronously, so that the lifting slider drives the lifting rod to slide up and down. The lifting rod drives the rotating frame, the first hook, the body shell and the movable box to slide up and down synchronously, so that the second hook is sleeved below the outer wall of the fixed rod. Through the cooperation of the spring, the first hook and the second hook, the body shell drives the radiator to be fixedly connected to the left side of the lifting rod and the fixed rod. Through the above design, the fixation of the radiator is realized, avoiding that some radiators are difficult to accurately correspond to the fixing seat during the installation process, thus avoiding that some radiators are difficult to be quickly installed and fixed, improving the loading and unloading efficiency, and enhancing the convenience and practicality of the device.

[0023] 2. The indoor radiator connection structure with a stable structure is provided with a rotating mechanism. The transmission rod drives the bevel gear and the symmetric screw rod to rotate synchronously, so that the rotating slider drives the bottom end of the traction rod to slide symmetrically towards the middle, and the other end of the traction rod drives the adjusting block to slide up and down, so that the adjusting block drives the fixed shaft, the rotating frame, the body shell and the radiator to rotate along the lifting rod. Through the above design, the rotation of the bottom end of the radiator is realized, avoiding that some radiators are difficult to connect the inlet and outlet water pipes, thus avoiding that some heating pipes are difficult to be cleaned and maintained, improving the maintenance efficiency, and enhancing the convenience and practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a side view sectional schematic diagram of the structure of the present invention;

[0026] Figure 3 It is a front view sectional schematic diagram of the structure of the present invention;

[0027] Figure 4 It is a side view sectional schematic diagram of the partial structure of the wall surface and the fixing seat of the present invention;

[0028] Figure 5 For the present invention Figure 3 The enlarged schematic diagram of the structure at A in;

[0029] Figure 6 For the present invention Figure 3 The enlarged schematic diagram of the structure at B in;

[0030] Figure 7 For the present invention Figure 2 The enlarged schematic diagram of the structure at C in;

[0031] Figure 8 This is a front view sectional schematic diagram of the partial structure of the transmission box and the rotating mechanism of the present invention.

[0032] In the figure: 11, ground; 12, wall surface; 13, fixed seat; 15, transmission box; 16, body shell; 18, radiator; 2, fixing mechanism; 21, rotating shaft base; 22, transmission shaft; 23, driving wheel; 25, grip; 26, crawler; 28, driven wheel; 31, transmission rod; 32, threaded groove; 33, lifting slider; 35, lifting rod; 36, rotating frame; 38, fixed rod; 51, first hook; 52, movable box; 53, limiting rod; 55, sliding cylinder; 56, traction block; 58, second hook; 61, first threaded hole; 62, limiting sliding seam; 63, expansion bolt; 65, fixing bolt; 66, spring; 68, limiting sliding gap; 8, rotating mechanism; 81, first bevel gear; 82, second bevel gear; 83, symmetric screw; 86, rotating slider; 88, second threaded hole; 91, traction rod; 96, adjusting block; 98, fixed shaft. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figures 1-8 , an embodiment provided by the present invention:

[0035] An indoor radiator connection structure with a stable structure, including:

[0036] The ground 11, a wall surface 12 is fixedly connected above the ground 11. Fixed seats 13 are provided at the four corners on the left side of the wall surface 12. Expansion bolts 63 are inserted on the left side of the wall surface 12. The outer wall of the expansion bolt 63 is inserted into the inner wall of the fixed seat 13. A fixing bolt 65 is fixedly connected to the left inner wall of the expansion bolt 63. The fixing bolt 65 fixes the fixed seat 13 on the outer wall of the expansion bolt 63. The left end of the fixed seat 13 is fixedly connected with a transmission box 15. The transmission box 15 is fixedly connected to the side wall of the fixed seat 13 in a left-right symmetric manner. Through this design, the fixed seat 13 and the transmission box 15 are stably fixed on the wall surface 12. A body shell 16 is provided on the left side of the transmission box 15. A radiator 18 is fixedly connected inside the body shell 16;

[0037] Fixing mechanism 2, the fixing mechanism 2 includes a rotating shaft base 21, the bottom of the rotating shaft base 21 is fixedly connected below the wall surface 12, a transmission shaft 22 is movably connected inside the rotating shaft base 21, an active wheel 23 is fixedly connected between the outer walls of the transmission shaft 22 in the rotating shaft base 21, the bottom end of the transmission shaft 22 passes through the bottom rotating shaft base 21 and is fixedly connected with a grip 25, the outer wall of the active wheel 23 is meshed with a crawler 26, both sides of the inner wall of the crawler 26 are meshed with a driven wheel 28, the top of the driven wheel 28 is fixedly connected with a transmission rod 31, the top end of the transmission rod 31 passes through the bottom of the transmission box 15 and is movably connected to the inner top of the transmission box 15, a thread groove 32 is opened above the outer wall of the transmission rod 31, a lifting slider 33 is movably connected to the outer wall of the thread groove 32, one side of the lifting slider 33 close to the vertical central axis of the machine body shell 16 passes through the transmission box 15 and is fixedly connected with a lifting rod 35, a first threaded hole 61 corresponding to the thread groove 32 is opened in the inner wall of the lifting slider 33, a limiting sliding slot 62 corresponding to the lifting slider 33 is opened above the right side of the transmission box 15. Through this design, it is realized that the transmission rod 31 drives the lifting slider 33 to slide up and down. Below the lifting rod 35, there is a rotating frame 36. The top of both sides of the rotating frame 36 is movably connected to the side wall of the transmission box 15. The lower part of the inner wall of the rotating frame 36 is movably connected with a fixing rod 38. A first hook 51 is fixedly connected above the right side of the machine body shell 16. The right side of the first hook 51 is hung on the outer wall above the lifting rod 35. Through this design, it is realized that the machine body shell 16 is connected to the outer wall of the lifting rod 35 through the first hook 51. A movable box 52 is fixedly connected below the right side of the machine body shell 16. A limiting rod 53 is fixedly connected in the middle of the inner part of the movable box 52. A sliding cylinder 55 is movably connected to the outer wall of the limiting rod 53. Through this design, the limiting sliding of the sliding cylinder 55 is realized. A traction block 56 is fixedly connected to the right side of the sliding cylinder 55. The right end of the traction block 56 passes through the movable box 52 and is fixedly connected with a second hook 58. The right side of the second hook 58 is movably connected to the outer wall below the fixing rod 38. Through this design, it is realized that the sliding cylinder 55 drives the second hook 58 to slide in a limited way through the traction block 56. The top end of the sliding cylinder 55 is fixedly connected with a spring 66. The top end of the spring 66 is fixedly connected to the upper part inside the movable box 52. A limiting sliding gap 68 corresponding to the traction block 56 is opened on the right side of the movable box 52. Through this design, the linear growth of the stress intensity of the second hook 58 is realized, and the breakage of the second hook 58 during the fixing process is avoided;

[0038] Rotating mechanism 8, the rotating mechanism 8 includes a first bevel gear 81. The right side of the bottom of the first bevel gear 81 is meshed and connected with a second bevel gear 82. The right side of the second bevel gear 82 is fixedly connected with a symmetric screw 83. The right end of the symmetric screw 83 passes through the left transmission box 15 and is movably connected to the lower left side of the right transmission box 15. Through this design, it is realized that the transmission rod 31 drives the symmetric screw 83 to move synchronously through the bevel gear. Both sides of the outer wall of the symmetric screw 83 are movably connected with rotating sliders 86. A second threaded hole 88 corresponding to the symmetric screw 83 is opened in the inner wall of the rotating slider 86. The top of the rotating slider 86 is movably connected with a traction rod 91. Through this design, it is realized that the symmetric screw 83 drives the bottom of the traction rod 91 to slide symmetrically through the rotating slider 86. The other end of the traction rod 91 is movably connected with an adjusting block 96. The top of the adjusting block 96 is movably connected with a fixed shaft 98. The top of the fixed shaft 98 is fixedly connected to the middle of the bottom end of the rotating frame 36. Through this design, the rotation of the rotating frame 36 is realized.

[0039] Working principle: When it is necessary to fix the radiator 18, first drive the first hook 51 by the machine body shell 16 to be hung on the upper part of the outer wall of the lifting rod 35, and make the right side of the movable box 52 driven by the machine body shell 16 lean against the outer wall of the fixed rod 38. Then, rotate the grip 25 clockwise. The grip 25 drives the transmission shaft 22 to rotate inside the rotating shaft base 21. The transmission shaft 22 drives the driving wheel 23 to rotate synchronously. The driving wheel 23 meshes and drives the crawler 26 to rotate counterclockwise. The crawler 26 meshes and drives the driven wheel 28 to rotate synchronously. The driven wheel 28 drives the transmission rod 31 to rotate synchronously. The lifting slider 33 is restricted by the thread groove 32, the first threaded hole 61 and the limit sliding slot 62, so that the lifting slider 33 drives the lifting rod 35 to slide upward synchronously. The lifting rod 35 drives the first hook 51 to slide synchronously. The first hook 51 drives the machine body shell 16 to slide synchronously, so that the machine body shell 16 drives the second hook 58 through the movable box 52 to be sleeved on the lower part of the outer wall of the fixed rod 38. The second hook 58 is restricted by the fixed rod 38, so that the second hook 58 drives the sliding cylinder 55 to slide downward on the outer wall of the limit rod 53 through the traction block 56. At the same time, the sliding cylinder 55 stretches the spring 66, so that the second hook 58 receives an upward pulling force. Through the cooperation of the first hook 51 and the second hook 58, the machine body shell 16 drives the radiator 18 to be fixedly connected to the left sides of the lifting rod 35 and the fixed rod 38, realizing the fixing operation of the radiator 18.

[0040] When it is necessary to rotate the bottom end of the radiator 18, first rotate the grip 25 counterclockwise, so that the transmission rod 31 rotates clockwise. The transmission rod 31 drives the first bevel gear 81 to rotate synchronously. The first bevel gear 81 meshes with the second bevel gear 82 to drive the second bevel gear 82 to rotate synchronously. The second bevel gear 82 drives the symmetric screw rod 83 to rotate synchronously. The rotating slider 86 is restricted by the second threaded hole 88, so that the rotating slider 86 drives the bottom end of the traction rod 91 to slide symmetrically towards the middle. The other end of the traction rod 91 drives the adjusting block 96 to slide up and down. The top end of the adjusting block 96 is restricted by the fixed shaft 98, so that the adjusting block 96 drives the fixed shaft 98 and the rotating frame 36 to rotate along the lifting rod 35. The rotating frame 36 drives the machine body housing 16 and the radiator 18 to rotate synchronously, realizing the rotation operation of the bottom end of the radiator 18, and the operation ends here.

[0041] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. An indoor radiator connection structure with a stable structure, characterized in that Including: A ground (11), a wall surface (12) is fixedly connected above the ground (11), fixing seats (13) are arranged at four corners on the left side of the wall surface (12), a transmission box (15) is fixedly connected to the left end of the fixing seat (13), a machine body shell (16) is arranged on the left side of the transmission box (15), and a radiator (18) is fixedly connected inside the machine body shell (16); A fixing mechanism (2), the fixing mechanism (2) includes a rotating shaft base (21), the bottom of the rotating shaft base (21) is fixedly connected below the wall surface (12), a transmission shaft (22) is movably connected inside the rotating shaft base (21), a driving wheel (23) is fixedly connected to the outer wall of the transmission shaft (22) between the rotating shaft bases (21), the bottom end of the transmission shaft (22) passes through the rotating shaft base (21) at the bottom and is fixedly connected with a handle (25), a crawler belt (26) is meshed with the outer wall of the driving wheel (23), driven wheels (28) are meshed with both sides of the inner wall of the crawler belt (26), a transmission rod (31) is fixedly connected to the top of the driven wheel (28), the top end of the transmission rod (31) passes through the bottom of the transmission box (15) and is movably connected to the inner top end of the transmission box (15), a threaded groove (32) is formed in the upper part of the outer wall of the transmission rod (31), a lifting slider (33) is movably connected to the outer wall of the threaded groove (32), one side of the lifting slider (33) close to the vertical central axis of the machine body shell (16) passes through the transmission box (15) and is fixedly connected with a lifting rod (35), a rotating frame (36) is arranged below the lifting rod (35), the top parts on both sides of the rotating frame (36) are movably connected to the side wall of the transmission box (15), and a fixing rod (38) is movably connected to the lower part of the inner wall of the rotating frame (36); A first hook (51) is fixedly connected above the right side of the machine body shell (16), and the right side of the first hook (51) is hung on the upper part of the outer wall of the lifting rod (35); A rotating mechanism (8), the rotating mechanism (8) includes a first bevel gear (81), and the inner wall of the first bevel gear (81) is movably connected to the lower part of the outer wall of the left transmission rod (31); A second bevel gear (82) is meshed with the bottom right side of the first bevel gear (81), a symmetric screw rod (83) is fixedly connected to the right side of the second bevel gear (82), the right end of the symmetric screw rod (83) passes through the left transmission box (15) and is movably connected to the lower left side of the right transmission box (15); Rotating sliders (86) are movably connected to both sides of the outer wall of the symmetric screw rod (83), a second threaded hole (88) corresponding to the symmetric screw rod (83) is formed in the inner wall of the rotating slider (86), and a traction rod (91) is movably connected to the top end of the rotating slider (86); The other end of the traction rod (91) is movably connected to an adjusting block (96), a fixed shaft (98) is movably connected to the top end of the adjusting block (96), and the top end of the fixed shaft (98) is fixedly connected to the middle part of the bottom end of the rotating frame (36).

2. The connection structure of an indoor radiator with a stable structure according to claim 1, characterized in that: An expansion bolt (63) is inserted on the left side of the wall surface (12). The outer wall of the expansion bolt (63) is inserted into the inner wall of the fixing base (13). A fixing bolt (65) is fixedly connected to the left inner wall of the expansion bolt (63). The fixing bolt (65) fixes the fixing base (13) on the outer wall of the expansion bolt (63). The transmission box (15) is fixedly connected to the side walls of the fixing base (13) in a left-right symmetric manner.

3. The indoor radiator connection structure with a stable structure according to claim 1, characterized in that: A first threaded hole (61) corresponding to the threaded groove (32) is formed in the inner wall of the lifting slider (33). A limiting sliding slot (62) corresponding to the lifting slider (33) is formed above the right side of the transmission box (15).

4. A connection structure for an indoor radiator with a stable structure according to claim 1, characterized in that: A movable box (52) is fixedly connected to the lower right side of the body shell (16). A limiting rod (53) is fixedly connected to the middle of the inside of the movable box (52). A sliding cylinder (55) is movably connected to the outer wall of the limiting rod (53).

5. A connection structure for an indoor radiator with a stable structure according to claim 4, characterized in that: A traction block (56) is fixedly connected to the right side of the sliding cylinder (55). The right end of the traction block (56) passes through the movable box (52) and is fixedly connected to a second hook (58). The right side of the second hook (58) is movably connected to the lower part of the outer wall of the fixing rod (38).

6. The indoor radiator connection structure with a stable structure according to claim 5, characterized in that: A spring (66) is fixedly connected to the top end of the sliding cylinder (55). The top end of the spring (66) is fixedly connected to the upper part of the inside of the movable box (52). A limiting sliding gap (68) corresponding to the traction block (56) is formed on the right side of the movable box (52).

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