A protective device for prefabricated building construction

Abstract

The present invention relates to the technical field of building construction protection. Specifically, it relates to a protection device for prefabricated building construction, which includes a rectangular plate. A swinging and storing structure is arranged at the top of the rectangular plate, and two groups of clamping and fixing structures are also arranged at the top of the rectangular plate. A cross-stabilizing structure is arranged at the bottom of the swinging and storing structure. In this protection device for prefabricated building construction, by driving the cross-stabilizing structure to swing crosswise to make the swinging and storing structure parallel, and as the swinging and storing structure becomes parallel and drives the clamping and fixing structures to support and stabilize the swinging and storing structure, it can not only mechanically cross-support the swinging and storing structure, but also enable workers to walk stably on the swinging and storing structure. This can not only prevent workers from forgetting to install the support frame or not fastening the support frame firmly, but also improve the stability of the support of the swinging and storing structure.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction protection, and more specifically, to a protection device for prefabricated building construction. Background Art

[0002] A scaffolding is a working platform erected to ensure the smooth progress of each construction process. It can be divided into external scaffolding and internal scaffolding according to the erected position; it can be divided into wooden scaffolding, bamboo scaffolding, and steel pipe scaffolding according to different materials; and it can be divided into vertical pole scaffolding, bridge scaffolding, portal scaffolding, suspended scaffolding, hanging scaffolding, cantilevered scaffolding, and climbing scaffolding according to the structural form.

[0003] Currently, most scaffolding is a working platform erected by means of assembly. After the existing scaffolding is erected, since most of the existing scaffolding is erected vertically and support frames are installed crosswise in the middle of the two vertical parts for stable erection, although the existing scaffolding can improve the stability of the installed scaffolding, it is easy for workers to forget to install the support frames or not fully fasten the support frames, which will reduce the stability of the scaffolding and pose a threat to the personal safety of subsequent workers. And when the existing scaffolding is demolished, it needs to be manually demolished, which not only reduces work efficiency but also may cause incomplete demolition or unnecessary damage to the surrounding scaffolding structure due to non-standard manual operations.

[0004] Moreover, currently, most of the disassembled scaffolding is stably transported by bundling. If the bundling is too tight, it will cause deformation or damage to the scaffolding components. If it is too loose, the center of gravity of the scaffolding will be unstable and it will fall off, thus affecting the transportation work. In view of this, we propose a protection device for prefabricated building construction. Summary of the Invention

[0005] The purpose of the present invention is to provide a protection device for prefabricated building construction to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides a protection device for prefabricated building construction, including a rectangular plate. A swing and storage structure is arranged on the top of the rectangular plate. Two groups of clamping and fixing structures are also arranged on the top of the rectangular plate. A cross-stabilizing structure is arranged at the bottom of the swing and storage structure.

[0007] A "triangle" bracket-shaped support is formed between the cross-stabilizing structure and the rectangular plate by cross-swinging to support the swing and storage structure, and the swing and storage structure is driven to rotate into a support platform.

[0008] When the cross-stabilizing structure swings back and gathers, it drives the swing and storage structure to rotate downward and fold, and at the same time drives the clamping and fixing structure to clamp and limit the swing and storage structure.

[0009] Preferably, the swinging storage structure includes a fixed plate, the bottom of the fixed plate is fixedly connected to the surface of the rectangular plate, one side of the fixed plate away from the rectangular plate is rotatably connected to a rotating shaft, and a support plate is rotatably connected to the surface of the rotating shaft.

[0010] Preferably, two groups of the support plates are symmetrically arranged along the horizontal center of the rotating shaft, and both groups of the support plates are rotatably connected to the rotating shaft.

[0011] Preferably, the cross-stabilizing structure includes a first swinging plate, the middle of the first swinging plate is fixedly connected to the output shaft end of the first external motor, the first external motor is fixedly connected to the fixed plate, a first fixed shaft is fixedly connected to the surface of the first swinging plate, one end of the first swinging plate close to the first fixed shaft is rotatably connected to a first U-shaped limiting plate through a first pin shaft, a first spring is fixedly connected to the bottom of the first U-shaped limiting plate, one end of the first spring away from the first U-shaped limiting plate is fixedly connected to a first sliding block, a first rectangular groove is formed on the surface of the rectangular plate, the first sliding block is slidably connected to the inside of the first rectangular groove, and a first damping rod is provided inside the first spring.

[0012] Preferably, one end of the first swinging plate away from the first U-shaped limiting plate is rotatably connected to a second U-shaped limiting plate through a second pin shaft, the second U-shaped limiting plate is slidably connected to the bottom of the support plate, and a second rectangular groove is formed at the bottom of the support plate, and the second U-shaped limiting plate is slidably connected to the inside of the second rectangular groove formed at the bottom of the support plate.

[0013] Preferably, a third rectangular groove is formed on the surface of the rectangular plate, a second sliding block is slidably connected to the inside of the third rectangular groove, a second spring is fixedly connected to the top of the second sliding block, one end of the second spring away from the second sliding block is fixedly connected to a third U-shaped limiting plate, a second swinging plate is rotatably connected to the inside of the third U-shaped limiting plate through a third pin shaft, the second swinging plate is fixedly connected to the output shaft end of the second external motor, a second damping rod is provided inside the second spring, a second fixed shaft is fixedly connected to one side of the second swinging plate close to the third U-shaped limiting plate, a fourth U-shaped limiting plate is rotatably connected to the other side of the second swinging plate away from the third U-shaped limiting plate, and a fourth rectangular groove is slidably connected to the surface of the fourth U-shaped limiting plate, and the fourth rectangular groove is formed at the bottom of the support plate.

[0014] Preferably, a second rectangular groove is formed at the bottom of the support plate, a second U-shaped limiting plate is slidably connected to the inside of the second rectangular groove, and the second U-shaped limiting plate is rotatably connected to the second swinging plate through a fourth pin shaft.

[0015] Preferably, the clamping and fixing structure includes a fifth rectangular groove opened on the surface of the rectangular plate. A telescopic sliding plate is slidably connected inside the fifth rectangular groove. One side of the telescopic sliding plate away from the fifth rectangular groove is rotatably connected to the bottom of the support plate through a fourth pin shaft. A first clamping plate is fixedly connected to the side surface of the telescopic sliding plate. A telescopic plate is fixedly connected to the surface of the rectangular plate, and a second clamping plate is fixedly connected to one side of the telescopic plate away from the rectangular plate.

[0016] Preferably, there are two groups of the fifth rectangular grooves opened on the surface of the rectangular plate symmetrically arranged along the horizontal center of the rectangular plate. There are two groups of the telescopic sliding plates and the first clamping plates slidably connected inside the fifth rectangular grooves symmetrically arranged along the horizontal center of the rectangular plate. The telescopic plate fixedly connected to the surface of the rectangular plate is telescopic, and there are two groups of the second clamping plates fixedly connected to the top of the telescopic plate symmetrically arranged along the horizontal center of the telescopic plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. In this protective device for prefabricated building construction, by driving the cross-stabilizing structure to swing crosswise to parallel the swing and storage structure, and as the swing and storage structure becomes parallel and drives the clamping and fixing structure to support and stabilize the swing and storage structure, it is possible to mechanically cross-support the swing and storage structure while enabling workers to walk stably on the swing and storage structure. This can not only prevent workers from forgetting to install the support frame or not fastening the support frame firmly, but also improve the stability of the support of the swing and storage structure.

[0019] 2. In this protective device for prefabricated building construction, when the cross-stabilizing structure swings back to fold the swing and storage structure, it drives the clamping and fixing structure to clamp and stabilize the swing and storage structure at the same time. Thus, it is possible to fold and recycle the scaffolding and clamp and stabilize the folded scaffolding, which can not only reduce the working time for workers to disassemble the scaffolding, but also automatically clamp and stabilize the folded scaffolding, thereby improving the practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a side perspective view of the overall structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the present invention with the swing and storage structure removed;

[0023] Figure 4 It is a top perspective view of the present invention with the swing and storage structure removed;

[0024] Figure 5Schematic structural diagram of the rectangular plate removed for the present invention;

[0025] Figure 6 Schematic diagram of the motion state of the overall structure of the present invention;

[0026] Figure 7 Schematic diagram of the motion state of the swing storage structure removed for the present invention;

[0027] Figure 8 is Figure 7 Enlarged schematic diagram at position A in;

[0028] Figure 9 Schematic diagram of the motion state of the clamping and fixing structure of the present invention.

[0029] The meanings of each label in the figure are as follows:

[0030] 1. Rectangular plate; 200. Swing storage structure; 201. Fixed plate; 202. Rotating shaft; 203. Support plate; 300. Cross-stabilizing structure; 301. First swing plate; 302. First fixed shaft; 303. First U-shaped limit plate; 304. First spring; 305. First sliding block; 306. First rectangular groove; 307. Second U-shaped limit plate; 308. Second rectangular groove; 309. Second swing plate; 310. Third U-shaped limit plate; 311. Second spring; 312. Second sliding block; 313. Third rectangular groove; 314. Second fixed shaft; 315. Fourth U-shaped limit plate; 316. Fourth rectangular groove; 400. Clamping and fixing structure; 401. Telescopic sliding plate; 402. First clamping plate; 403. Fifth rectangular groove; 404. Telescopic plate; 405. Second clamping plate. Detailed implementation manners

[0031] 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 present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0032] For the embodiments of the present invention, please refer to Figures 1 to 9 , a protective device for prefabricated building construction, including a rectangular plate 1, a swing storage structure 200 is arranged on the top of the rectangular plate 1, two groups of clamping and fixing structures 400 are also arranged on the top of the rectangular plate 1, and a cross-stabilizing structure 300 is arranged at the bottom of the swing storage structure 200;

[0033] A "triangle" bracket-shaped support for the swing storage structure 200 is formed between the cross-stabilizing structure 300 and the rectangular plate 1 through cross-swinging, and the swing storage structure 200 is driven to rotate into a support platform;

[0034] When the swing storage structure 200 is reset and gathered through the cross-stabilizing structure 300, the swing storage structure 200 is driven to rotate downward and fold, and at the same time, the clamping and fixing structure 400 is driven to clamp and limit the swing storage structure 200;

[0035] In this invention, considering that most of the existing scaffolding is a working platform erected by assembling, and after the existing scaffolding is erected, since most of the scaffolding is erected vertically and the support frames are cross-installed in the middle of two verticals for stable erection, although the existing can improve the stability of the installed scaffolding, it is easy for workers to forget to install the support frames or not fully fasten the support frames, which will reduce the stability of the scaffolding and pose a threat to the personal safety of subsequent workers. And when the existing scaffolding is demolished, it needs to be manually demolished, which not only reduces work efficiency but also may cause incomplete demolition or unnecessary damage to the surrounding scaffolding structure due to non-standard manual operations. Therefore, by driving the cross-stabilizing structure 300 to cross-swing to parallel the swing storage structure 200, and as the swing storage structure 200 is paralleled and the clamping and fixing structure 400 is driven to support and stabilize the swing storage structure 200, it can not only cross-support the swing storage structure 200 mechanically but also enable workers to walk stably on the swing storage structure 200. It can not only prevent workers from forgetting to install the support frames or not installing and fastening the support frames but also improve the stability of the support of the swing storage structure 200;

[0036] And most of the existing scaffolding after disassembly is stably transported by bundling. If the bundling is too tight, it will cause deformation or damage to the scaffolding components. If it is too loose, it will cause the center of gravity of the scaffolding to be unstable and fall off, thus affecting the transportation work. Therefore, by resetting and swinging the cross-stabilizing structure 300 to fold the swing storage structure 200 and driving the clamping and fixing structure 400 to clamp and stabilize the swing storage structure 200 at the same time, it can not only fold and recycle the scaffolding but also clamp and stabilize the folded and recycled scaffolding, which can not only reduce the working time of workers for disassembling the scaffolding but also automatically clamp and stabilize the folded scaffolding, thus improving the practicability.

[0037] In the above embodiment, the following specific structures need to be disclosed in detail:

[0038] The swing storage structure 200 includes a fixing plate 201, the bottom of the fixing plate 201 is fixedly connected to the surface of the rectangular plate 1, and a rotating shaft 202 is rotatably connected to one side of the fixing plate 201 away from the rectangular plate 1, and a support plate 203 is rotatably connected to the surface of the rotating shaft 202;

[0039] In the above embodiment, in order to facilitate the opening of the support plate 203, the following specific structures need to be disclosed in detail. Please refer to the figure Figures 1 to 6, there are two sets of support plates 203 symmetrically arranged along the transverse center of the rotating shaft 202, and both sets of support plates 203 are rotatably connected to the rotating shaft 202;

[0040] In the above embodiment, in order to facilitate the opening and support of the support plate 203, the cross-stabilizing structure 300 includes a first swing plate 301. The middle of the first swing plate 301 is fixedly connected to the output shaft end of the first external motor. The first external motor is fixedly connected to the fixing plate 201. A first fixed shaft 302 is fixedly connected to the surface of the first swing plate 301. One end of the first swing plate 301 close to the first fixed shaft 302 is rotatably connected to a first U-shaped limiting plate 303 through a first pin shaft. A first spring 304 is fixedly connected to the bottom of the first U-shaped limiting plate 303. One end of the first spring 304 away from the first U-shaped limiting plate 303 is fixedly connected to a first sliding block 305. A first rectangular groove 306 is formed on the surface of the rectangular plate 1, and the first sliding block 305 is slidably connected to the inside of the first rectangular groove 306. A first damping rod is provided inside the first spring 304;

[0041] First of all, it should be noted that the staff needs to move this device to the working location, and then start the first external motor to rotate. Here, the rotation can only rotate half a turn to drive the first swing plate 301 to rotate. At this time, because the output shaft end of the above-mentioned external motor is fixedly connected to the middle of the first swing plate 301, when the first swing plate 301 rotates, it will drive the bottom first U-shaped limiting plate 303 to swing, and drive the first spring 304 (all the first springs 304 mentioned in this article can only be compressed or stretched by the swing of the first swing plate 301, and the staff's own pressure cannot compress and stretch the first spring 304) and the first sliding block 305 to slide inside the first rectangular groove 306 opened on the rectangular plate 1. And when the first swing plate 301 swings, it can drive the first fixed shaft 302 to move synchronously with another set of cross-stabilizing structures 300, so as to facilitate the subsequent cross-support of the swing storage structure 200;

[0042] In the above embodiment, in order to realize the opening and support of the swing storage structure 200, the following specific structure needs to be disclosed in detail. Please refer to Figure 5 , the end of the first swing plate 301 away from the first U-shaped limiting plate 303 is rotatably connected to a second U-shaped limiting plate 307 through a second pin shaft. The second U-shaped limiting plate 307 is slidably connected to the bottom of the support plate 203. A second rectangular groove 308 is opened at the bottom of the support plate 203, and the second U-shaped limiting plate 307 is slidably connected to the inside of the second rectangular groove 308 opened at the bottom of the support plate 203;

[0043] When the first swing plate 301 swings, it will drive the second U-shaped limit plate 307 at one end of the first swing plate 301 away from the first U-shaped limit plate 303 to slide inside the second rectangular groove 308. When the second U-shaped limit plate 307 slides the maximum distance inside the second rectangular groove 308, it will drive the support plate 203 to open around the rotation shaft 202;

[0044] In the above embodiment, in order to realize the opening and cross-support of the two groups of support plates 203, the following specific structure needs to be disclosed in detail. Please refer to Figures 2 to 6 , a third rectangular groove 313 is formed on the surface of the rectangular plate 1. A second sliding block 312 is slidably connected inside the third rectangular groove 313. A second spring 311 is fixedly connected to the top of the second sliding block 312. One end of the second spring 311 away from the second sliding block 312 is fixedly connected to a third U-shaped limit plate 310. A second swing plate 309 is rotatably connected inside the third U-shaped limit plate 310 through a third pin shaft. The second swing plate 309 is fixedly connected to the output shaft end of the second external motor. A second damping rod is provided inside the second spring 311. A second fixed shaft 314 is fixedly connected to one side of the second swing plate 309 close to the third U-shaped limit plate 310. A fourth U-shaped limit plate 315 is rotatably connected to the other side of the second swing plate 309 away from the third U-shaped limit plate 310. A fourth rectangular groove 316 is slidably connected to the surface of the fourth U-shaped limit plate 315. The fourth rectangular groove 316 is formed at the bottom of the support plate 203;

[0045] In the above embodiment, in order to further facilitate the opening of the other group of support plates 203, the following specific structure needs to be disclosed in detail. Please refer to Figure 5 , a second rectangular groove 308 is formed at the bottom of the support plate 203. A second U-shaped limit plate 307 is slidably connected inside the second rectangular groove 308. The second U-shaped limit plate 307 is rotatably connected to the second swing plate 309 through a fourth pin shaft;

[0046] When the first external motor starts, it will simultaneously drive the second external motor to start (the rotation directions of the output shaft ends of the two are opposite), and can only rotate half a turn. When the second external motor rotates, it will drive the second swing plate 309 to swing (the operation of this embodiment is opposite to that of the above embodiment), and drive the third U-shaped limit plate 310, the second spring 311 (all the second springs 311 mentioned in this article can only be compressed or stretched by the swing of the second swing plate 309, and the pressure of the staff themselves cannot compress the second spring 311), and the second slider 312 to slide inside the third rectangular groove 313. And when the second swing plate 309 swings, the fourth U-shaped limit plate 315 at the end of the second swing plate 309 away from the third U-shaped limit plate 310 slides in the fourth rectangular groove 316. When the fourth U-shaped limit plate 315 slides the maximum distance inside the fourth rectangular groove 316, it will drive another set of support plates 203 to open around the rotating shaft 202, so that the two sets of support plates 203 are placed in a parallel state. At this time, the swing of the second swing plate 309 will drive the second fixed shaft 314 to drive the cross-stabilizing structure 300 that moves in the opposite direction synchronously, so as to cross-fix the support plate 203. Therefore, it can mechanically cross-support the swing storage structure 200 while enabling the staff to walk stably on the swing storage structure 200. It can not only prevent the staff from forgetting to install the support frame or not tightening the support frame, but also improve the stability of the support of the swing storage structure 200;

[0047] In the above embodiment, in order to vertically support the rotating shaft 202, the following specific structure needs to be disclosed in detail. Please refer to Figure 1 , the clamping and fixing structure 400 includes a fifth rectangular groove 403, which is opened on the surface of the rectangular plate 1. An expansion and sliding plate 401 is slidably connected inside the fifth rectangular groove 403. One side of the expansion and sliding plate 401 away from the fifth rectangular groove 403 is rotatably connected to the bottom of the support plate 203 through a fourth pin shaft. A first clamping plate 402 is fixedly connected to the side surface of the expansion and sliding plate 401. An expansion plate 404 is fixedly connected to the surface of the rectangular plate 1. A second clamping plate 405 is fixedly connected to one side of the expansion plate 404 away from the rectangular plate 1;

[0048] When the support plate 203 swings and opens, it will drive the expansion and sliding plate 401 to slide inside the fifth rectangular groove 403. When sliding the maximum distance, the expansion and sliding plate 401 will be in a vertical state, which can further improve the stability of the support plate 203. And after the cross-stabilizing structure 300 and the clamping and fixing structure 400 move to stabilize the support plate 203, the staff can install a ladder and climb to the surface of the support plate 203 to work, thereby improving the practicability;

[0049] In the above embodiments, in order to store the device without using it, the following specific structures need to be disclosed in detail. Please refer to Figures 1 to 9 , there are two groups of fifth rectangular grooves 403 opened on the surface of the rectangular plate 1 symmetrically arranged along the horizontal center of the rectangular plate 1. There are two groups of telescopic sliding plates 401 and first clamping plates 402 slidably connected inside the fifth rectangular groove 403 symmetrically arranged along the horizontal center of the rectangular plate 1. The telescopic plate 404 fixedly connected to the surface of the rectangular plate 1 is telescopically arranged. There are two groups of second clamping plates 405 fixedly connected to the top of the telescopic plate 404 symmetrically arranged along the horizontal center of the telescopic plate 404;

[0050] When the device is not in use, it is necessary to disassemble and place it on the surface of the rectangular plate 1 by means of a staff ladder. Then, start the two external motors to rotate in opposite directions, and make the two first swing plates 301 and the second swing plates 309 move and swing towards each other, and drive each second U-shaped limiting plate 307 to slide inside the second rectangular groove 308 and the fourth U-shaped limiting plate 315 to slide inside the fourth rectangular groove 316. When each group slides to the maximum distance, it will drive the two support plates 203 to swing towards the bottom of the rectangular plate 1 around the rotating shaft 202. Due to the limitation of the fixed plate 201 and the rotating shaft 202, the support plate 203 can swing. Finally, it will be as Figure 5 shown. At this time, when the two first swing plates 301 and the second swing plates 309 swing towards each other to the maximum distance, the first springs 304 and the second springs 311 of each group will be compressed, thereby facilitating the release of the pressure when the two first swing plates 301 and the second swing plates 309 swing towards each other to the maximum distance. Please refer to the following Figure 9 , when the two support plates 203 swing back, it will drive the telescopic sliding plate 401 to be compressed and slide inside the fifth rectangular groove 403, so that the telescopic sliding plate 401 drives the first clamping plate 402 to gradually approach the second clamping plate 405. When the first clamping plate 402 contacts the second clamping plate 405, it will drive the second clamping plate 405 to be compressed in the telescopic plate 404. When the telescopic sliding plate 401 and the first clamping plate 402 move to the maximum distance, the telescopic plate 404 releases the pressure and drives the second clamping plate 405 to be clamped with the first clamping plate 402, so as to realize the folding and recycling of the scaffolding and the clamping and fixation of the folded and recycled scaffolding at the same time. It can not only reduce the working time of the staff for disassembling the scaffolding, but also automatically clamp and fix the folded scaffolding, thereby improving the practicability.

[0051] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A protective device for prefabricated building construction, comprising a rectangular plate (1), characterized in that: A swinging storage structure (200) is provided at the top of the rectangular plate (1), and two sets of clamping and fixing structures (400) are also provided at the top of the rectangular plate (1). A cross-stabilizing structure (300) is provided at the bottom of the swinging storage structure (200). A "triangle" bracket shape is formed between the cross-stabilizing structure (300) and the rectangular plate (1) through cross-swinging to support the swinging storage structure (200) and drive the swinging storage structure (200) to rotate into a support platform. When the cross-stabilizing structure (300) swings back to gather, it drives the swinging storage structure (200) to rotate downward and fold, and at the same time drives the clamping and fixing structure (400) to clamp and limit the swinging storage structure (200). The clamping and fixing structure (400) includes a fifth rectangular groove (403). The fifth rectangular groove (403) is opened on the surface of the rectangular plate (1). A telescopic sliding plate (401) is slidably connected inside the fifth rectangular groove (403). One side of the telescopic sliding plate (401) away from the fifth rectangular groove (403) is rotatably connected to the bottom of the support plate (203) through a fourth pin shaft. A first clamping plate (402) is fixedly connected to the side surface of the telescopic sliding plate (401). A telescopic plate (404) is fixedly connected to the surface of the rectangular plate (1). A second clamping plate (405) is fixedly connected to one side of the telescopic plate (404) away from the rectangular plate (1). Two sets of the fifth rectangular grooves (403) opened on the surface of the rectangular plate (1) are symmetrically arranged along the horizontal center of the rectangular plate (1). Two sets of the telescopic sliding plates (401) and the first clamping plates (402) slidably connected inside the fifth rectangular grooves (403) are symmetrically arranged along the horizontal center of the rectangular plate (1). The telescopic plate (404) fixedly connected to the surface of the rectangular plate (1) is telescopically arranged. Two sets of the second clamping plates (405) fixedly connected to the top of the telescopic plate (404) are symmetrically arranged along the horizontal center of the telescopic plate (404). Two sets of the support plates (203) are symmetrically arranged along the horizontal center of the rotating shaft (202). Both sets of the support plates (203) are rotatably connected to the rotating shaft (202).

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