Packaging device for glass cover plate

By designing a packaging device with fixing and reinforcement mechanisms, and using components such as protective partitions and top airbags to separate, clamp, and limit the glass, the problem of friction and collision during the transportation of glass covers is solved, thus improving transportation safety and stability.

CN224225645UActive Publication Date: 2026-05-12HUNAN HEWEIXIN OPTOELECTRONICS TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HUNAN HEWEIXIN OPTOELECTRONICS TECHNOLOGY CO LTD
Filing Date
2025-06-18
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Existing glass covers are easily damaged during transportation due to mutual friction and collision. Existing protective films are not effective in protecting the glass, which affects the safety and integrity of the transport.

Method used

A packaging device including a fixing mechanism and a reinforcement mechanism was designed. The device uses components such as protective partitions, fixing clamps and top protective airbags to separate, clamp and limit the glass. Through the cooperation of the glass's own weight and elastic elements, the glass is stably fixed and protected.

Benefits of technology

It improves the safety and stability of glass cover transportation, prevents mutual friction and collision, adapts to the fixing requirements of glass of different thicknesses, and is easy to disassemble.

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Abstract

The utility model discloses a packaging device for a glass cover plate, which comprises a fixing mechanism and a top protection air bag arranged at the top of the fixing mechanism, a reinforcing mechanism is arranged on the outer side of the fixing mechanism, lifting supports are arranged on the two sides of the reinforcing mechanism, the fixing mechanism comprises a packaging base, and the top protection air bag is arranged on the top of the fixing mechanism. A plurality of fixing bottom plates are fixedly mounted at the top of the packaging base, fixing rotating rods are symmetrically and rotatably connected to the two sides of the top of each fixing bottom plate, fixing sliding sleeves are rotatably connected to the tops of the fixing rotating rods, fixing sliding rods are slidably connected into the fixing sliding sleeves, and glass is placed at the tops of fixing supports, the top of the fixed rotating rod is rotationally connected with a fixed sliding sleeve, the fixed support descends under the action of the gravity of the glass, and under the action of the fixed rotating rod, the fixed rotating rod rotates and drives the fixed sliding sleeve and a fixed sliding plate to move relatively at the same time, so that the glass is clamped and fixed through a fixed clamping plate.
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Description

Technical Field

[0001] This utility model relates to the field of glass cover processing technology, specifically to a packaging device for glass covers. Background Technology

[0002] Glass covers are becoming increasingly widely used in people's daily lives. As the application range of cover glass expands, consumers' demands for its appearance and function are also increasing. During the processing, packaging, stacking, and placement of glass covers, even if the glass surface is covered with a protective film, defects such as glass breakage, edge cracking, and chipping can still occur when cover glass shatters or rubs against each other or with objects that are harder than it.

[0003] Publication No. CN221914837U discloses a glass cover production and packaging device. By adjusting the positions of two sets of clamping plates and positioning plates, the size of the space they form can be changed to facilitate the fixing of products of various specifications. This makes it easier to stack the glass covers neatly, reducing collisions and friction caused by uneven stacking when the covers are placed into vacuum bags. Simultaneously, two sets of notches at the front and back facilitate the removal of the stacked products. However, this patent still has the following problems in actual use:

[0004] Although this glass cover production and packaging device can change the size of the space formed by adjusting the positions of two sets of clamping plates and positioning plates to fix products of various specifications, it cannot effectively protect the glass covers during transportation. This results in the glass covers rubbing and colliding with each other during transportation, which is detrimental to the safety of transporting the glass covers. Existing technology can use protective films for protection, but the protective film is relatively thin and will be damaged during transportation, thus affecting the integrity of the glass covers during transport.

[0005] Therefore, a packaging device for glass covers is proposed to solve the problems mentioned above. Utility Model Content

[0006] The purpose of this utility model is to provide a packaging device for glass covers, so as to solve the problem mentioned in the background art that the glass covers cannot be well protected during transportation, resulting in mutual friction and collision of the glass covers during transportation, which is not conducive to the transportation safety of the glass covers. In the prior art, protective film can be used for protection, but the protective film is too thin and will be damaged during transportation, thus affecting the integrity of the glass covers during transportation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a packaging device for glass covers, comprising a fixing mechanism and a top protective airbag installed on the top of the fixing mechanism;

[0008] A reinforcing mechanism is provided on the outside of the fixing mechanism, and lifting brackets are provided on both sides of the reinforcing mechanism.

[0009] Also includes:

[0010] The fixing mechanism includes a packaging base, and a number of fixing base plates are fixedly installed on the top of the packaging base. Fixing rotating rods are symmetrically rotatably connected to both sides of the top of the fixing base plates.

[0011] The top of the fixed rotating rod is rotatably connected to a fixed sliding sleeve, and the fixed sliding sleeve is slidably connected to a fixed sliding rod inside.

[0012] The fixed sliding rod is fixedly mounted on the outside of a fixed bracket. The fixed bracket has an installation groove at its center. A protective partition plate is engaged with the inside of the installation groove. The top protective airbag is engaged with the protective partition plate.

[0013] Preferably, a fixing spring is fixedly installed on one side of the fixing sliding sleeve, a fixing sliding plate is fixedly installed on the top of the fixing sliding sleeve, an adjusting bolt is internally threaded onto the fixing sliding plate, a protective spring is rotatably connected to one end of the adjusting bolt, and a fixing clamp is fixedly installed on one side of the protective spring.

[0014] Preferably, a lifting bracket is provided on both sides of the bottom of the fixed bracket, a lifting knob is rotatably connected to one end of the lifting bracket, a lifting bidirectional threaded rod is fixedly connected to the inner side of the lifting knob, and a lifting threaded sleeve is symmetrically threaded to the outer side of the lifting bidirectional threaded rod.

[0015] Preferably, a lifting rotating rod is rotatably connected to the bottom of the lifting threaded sleeve, a lifting sliding sleeve is rotatably connected to the bottom of the lifting rotating rod, a lifting sliding rod is slidably connected inside the lifting sliding sleeve, a lifting support frame is fixedly installed on the outside of the lifting sliding rod, and the lifting support frame is fixedly installed on both sides of the top of the fixed base plate.

[0016] Preferably, the reinforcement mechanism includes clamping brackets, which are symmetrically installed at the front and rear positions of the packaging base. A sprocket limiting frame is fixedly installed at one end of each of the two clamping brackets. A clamping motor is fixedly installed on one side of the inner side of the sprocket limiting frame, and a sprocket drive assembly is fixedly connected to the output end of the clamping motor.

[0017] Preferably, one side of the sprocket drive assembly is symmetrically connected with a clamping bidirectional threaded rod, and the outer sides of the two clamping bidirectional threaded rods are symmetrically threaded with clamping threaded sleeves. The lifting bracket is fixedly installed on the top of the clamping threaded sleeves, and a lifting motor is fixedly installed on one side of the top of the lifting bracket. The output end of the lifting motor is fixedly connected with a lifting rotating rod.

[0018] Preferably, bevel gear transmission assemblies are symmetrically installed at both ends of the lifting rotating rod, and a lifting threaded rod is fixedly installed at the bottom of the bevel gear transmission assembly. A lifting threaded sleeve is threadedly connected to the outer side of each of the two lifting threaded rods. A lifting plate is fixedly installed between the two lifting threaded sleeves. A reinforcing side plate is fixedly installed on one side of the bottom of the lifting plate. A reinforcing spring is fixed around one side of the reinforcing side plate, and a reinforcing support plate is fixedly installed at the end of the reinforcing spring.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: This packaging device for glass covers uses an internal mounting groove of a fixed bracket to insert a protective partition plate into the inside of the fixed bracket, thereby separating and packaging thinner glass. Simultaneously, the glass is placed on top of the fixed bracket, and the fixed bracket descends due to the glass's own weight. Under the action of a fixed rotating rod, the fixed rotating rod rotates, causing the fixed sliding sleeve and fixed sliding plate to move relative to each other. This allows the fixed clamping plate to hold and fix the glass, and the elastic force of the reinforcing springs causes the reinforcing support plate to fit against the sides of the glass, thereby limiting and supporting the glass and improving the stability of glass transportation. The specific details are as follows:

[0020] 1. By setting up a fixing mechanism, not only can protective partition plates be inserted into the mounting slots inside the fixing bracket to separate and package thinner glass, but also the glass can be placed on top of the fixing bracket. The glass's own weight causes the fixing bracket to descend. Under the action of the fixing rotating rod, the rotating rod rotates, causing the fixing sliding sleeve and fixing sliding plate to move relative to each other. This allows the fixing clamp to hold and fix the glass. The top protective airbag can limit and protect the tops of multiple glass panes, improving the safety of glass transportation, especially when transporting thicker glass. The protective partition plate can be removed. By rotating the adjusting bolt, the protective spring and the fixed clamping plate can be moved, thereby adjusting the distance between the two fixed clamping plates to facilitate clamping and fixing glass of different thicknesses. When it is necessary to disassemble the glass, the lifting knob is rotated to drive the lifting double threaded rod to rotate, so that the two lifting threaded sleeves move relative to each other and drive the lifting rotating rod to rotate. At the same time, the lifting sliding sleeve slides relative to the outside of the lifting sliding rod, while adjusting the distance between the lifting support frame and the lifting bracket, thereby lifting the fixed bracket and loosening the fixed clamping plate, thus facilitating the disassembly of the glass.

[0021] 2. By setting up a reinforcement mechanism, not only can the clamping motor drive the sprocket transmission assembly and the clamping bidirectional threaded rod to rotate, causing the clamping threaded sleeve to move the lifting bracket, but the lifting motor can also be started to drive the lifting rotating rod, the bevel gear transmission assembly, and the lifting threaded rod to rotate, causing the lifting threaded sleeve to move the lifting plate and the reinforcement side plate up and down. The lifting plate is moved to the top of the top protective airbag to provide limiting support for the top of the glass. At the same time, the elastic force of the reinforcement springs makes the reinforcement support plate fit against the sides of the glass, thereby providing limiting support for the glass and improving the stability of glass transportation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0023] Figure 2 This is a three-dimensional structural diagram of the fixing mechanism in this utility model;

[0024] Figure 3 This is a three-dimensional cross-sectional structural diagram of the fixed bracket in this utility model;

[0025] Figure 4 This is a three-dimensional cross-sectional structural diagram of the lifting bracket and lifting support frame in this utility model;

[0026] Figure 5 This is a three-dimensional structural diagram of the reinforcement mechanism in this utility model;

[0027] Figure 6 This is a three-dimensional structural diagram of the reinforcing spring and the reinforcing support plate in this utility model.

[0028] In the diagram: 1. Fixing mechanism; 101. Packaging base; 102. Fixing base plate; 103. Fixing rotating rod; 104. Fixing sliding sleeve; 105. Fixing sliding rod; 106. Fixing bracket; 107. Mounting slot; 108. Protective partition plate; 109. Top protective airbag; 110. Fixing spring; 111. Fixing sliding plate; 112. Adjusting bolt; 113. Protective spring; 114. Fixing clamp; 115. Lifting bracket; 116. Lifting knob; 117. Lifting double-threaded rod; 118. Lifting threaded sleeve; 119. Lifting rotating rod; 20. Lifting sliding sleeve; 121. Lifting sliding rod; 122. Lifting support frame; 2. Reinforcing mechanism; 201. Clamping bracket; 202. Sprocket limit frame; 203. Clamping motor; 204. Sprocket transmission assembly; 205. Clamping bidirectional threaded rod; 206. Clamping threaded sleeve; 207. Lifting bracket; 208. Lifting motor; 209. Lifting rotating rod; 210. Bevel gear transmission assembly; 211. Lifting threaded rod; 212. Lifting threaded sleeve; 213. Lifting plate; 214. Reinforcing side plate; 215. Reinforcing spring; 216. Reinforcing support plate. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-6 This utility model provides a technical solution: a packaging device for glass covers, including a fixing mechanism 1 and a top protective airbag 109 installed on the top of the fixing mechanism 1. A reinforcing mechanism 2 is provided on the outside of the fixing mechanism 1, and lifting brackets 207 are provided on both sides of the reinforcing mechanism 2. The fixing mechanism 1 includes a packaging base 101, and a plurality of fixed base plates 102 are fixedly installed on the top of the packaging base 101. Fixed rotating rods 103 are symmetrically rotatably connected to the top sides of the fixed base plates 102. The top of the fixed rotating rods 103 is rotatably connected to a fixed rotating rod. A fixed sliding sleeve 104 has a fixed sliding rod 105 slidably connected inside it. A fixed bracket 106 is fixedly installed on the outer side of the fixed sliding rod 105. An installation groove 107 is formed at the center of the fixed bracket 106, and a protective partition plate 108 is engaged inside the installation groove 107. A top protective airbag 109 is engaged with the protective partition plate 108. A fixed spring 110 is fixedly installed on one side of the fixed sliding sleeve 104, and a fixed sliding plate 111 is fixedly installed on the top of the fixed sliding sleeve 104. An adjusting bolt 112 is internally threaded onto component 111. One end of the adjusting bolt 112 is rotatably connected to a protective spring 113. A fixing clamp 114 is fixedly mounted on one side of the protective spring 113. A protective partition plate 108 is inserted into the fixing bracket 106 via an internal mounting groove 107, thereby separating and packaging thinner glass. Simultaneously, the glass is placed on top of the fixing bracket 106, and its own weight causes the fixing bracket 106 to descend. Under the action of the fixing rotating rod 103, the fixing rotating rod 104... 03 While rotating, it drives the fixed sliding sleeve 104 and the fixed sliding plate 111 to move relative to each other, thereby using the fixed clamping plate 114 to clamp and fix the glass. The top protective airbag 109 can limit and protect the top of multiple glass pieces, improving the safety of glass transportation. When transporting thicker glass, the protective partition plate 108 can be removed. By rotating the adjusting bolt 112, the protective spring 113 and the fixed clamping plate 114 can be moved, thereby adjusting the distance between the two fixed clamping plates 114, which is convenient for clamping and fixing glass of different thicknesses.

[0031] Both sides of the bottom of the fixed bracket 106 are provided with lifting brackets 115. One end of the lifting bracket 115 is rotatably connected to a lifting knob 116. The inner side of the lifting knob 116 is fixedly connected to a lifting double-threaded rod 117. The outer side of the lifting double-threaded rod 117 is symmetrically threaded with lifting threaded sleeves 118. The bottom of the lifting threaded sleeve 118 is rotatably connected to a lifting rotating rod 119. The bottom of the lifting rotating rod 119 is rotatably connected to a lifting sliding sleeve 120. The inner side of the lifting sliding sleeve 120 is slidably connected to a lifting sliding rod 121. The outer side of the lifting sliding rod 121 is fixedly installed with... The lifting support frame 122 is fixedly installed on both sides of the top of the fixed base plate 102. When the glass needs to be disassembled, the lifting knob 116 is turned to drive the lifting bidirectional threaded rod 117 to rotate, so that the two lifting threaded sleeves 118 move relative to each other and drive the lifting rotating rod 119 to rotate. At the same time, the lifting sliding sleeve 120 slides relative to the outside of the lifting sliding rod 121, and the distance between the lifting support frame 122 and the lifting bracket 115 is adjusted, so that the fixed bracket 106 can be lifted and the fixed clamp 114 can be loosened, thus facilitating the disassembly of the glass.

[0032] The reinforcement mechanism 2 includes clamping brackets 201, which are symmetrically installed at the front and rear positions of the packaging base 101. A sprocket limit frame 202 is fixedly installed at one end of each clamping bracket 201. A clamping motor 203 is fixedly installed inside one side of the sprocket limit frame 202. A sprocket drive assembly 204 is fixedly connected to the output end of the clamping motor 203. A clamping bidirectional threaded rod 205 is symmetrically connected to one side of the sprocket drive assembly 204. Clamping threaded sleeves 206 are symmetrically threaded to the outer sides of both clamping bidirectional threaded rods 205. A lifting bracket 207 is fixedly installed on the top of the clamping threaded sleeves 206. A lifting motor 208 is fixedly installed on one side of the top of the lifting bracket 207. A lifting rotating rod 209 is fixedly connected to the output end of the lifting motor 208. A bevel gear drive assembly 210 is symmetrically installed at both ends of the lifting rotating rod 209. A lifting threaded rod 211 is fixedly installed at the bottom of the bevel gear drive assembly 210. Lifting threaded rods 211 are threaded to the outer sides of both lifting threaded rods 211. A lifting plate 213 is fixedly installed between two lifting threaded sleeves 212. A reinforcing side plate 214 is fixedly installed on one side of the bottom of the lifting plate 213. Reinforcing springs 215 are fixed around one side of the reinforcing side plate 214. A reinforcing support plate 216 is fixedly installed at the end of the reinforcing springs 215. The clamping motor 203 drives the sprocket transmission assembly 204 and the clamping bidirectional threaded rod 205 to rotate, causing the clamping threaded sleeve 206 to move the lifting bracket 207. At the same time, the lifting motor is activated. The machine 208 drives the lifting rotating rod 209, the bevel gear transmission assembly 210, and the lifting threaded rod 211 to rotate, causing the lifting threaded sleeve 212 to drive the lifting plate 213 and the reinforced side plate 214 to move up and down. The lifting plate 213 is moved to the top of the top protective airbag 109 to provide limiting support for the top of the glass. At the same time, the elastic force of the reinforcing spring 215 is used to make the reinforcing support plate 216 fit against the sides of the glass, thereby providing limiting support for the glass and improving the stability of glass transportation.

[0033] Working principle: Before using this packaging device for glass covers, it is necessary to check the overall condition of the device to ensure it can operate normally. Figure 1 - Figure 6As shown, firstly, the protective partition plate 108 is inserted into the fixed bracket 106 through the mounting groove 107 inside the fixed bracket 106, thereby separating and packaging thinner glass. Simultaneously, the glass is placed on top of the fixed bracket 106, and the fixed bracket 106 descends due to its own weight. Under the action of the fixed rotating rod 103, the fixed rotating rod 103 rotates, causing the fixed sliding sleeve 104 and the fixed sliding plate 111 to move relative to each other, thus using the fixed clamping plate 114 to clamp and fix the glass. The top protective airbag 109 can limit and protect the tops of multiple pieces of glass, improving the safety of glass transportation. When transporting thicker glass, the protective partition plate 108 can be removed. By rotating the adjusting bolt 112, the protective spring 113 and the fixed clamping plate 114 can be moved, thereby adjusting the distance between the two fixed clamping plates 114 to facilitate clamping and fixing glass of different thicknesses. Secondly, the clamping motor 203 drives the sprocket transmission assembly 204 and the clamping bidirectional threaded rod 205 to rotate, thus clamping... The threaded sleeve 206 drives the lifting bracket 207 to move, and at the same time, the lifting motor 208 is started, driving the lifting rotating rod 209, the bevel gear transmission assembly 210 to rotate and the lifting threaded rod 211 to rotate. This causes the lifting threaded sleeve 212 to drive the lifting plate 213 and the reinforced side plate 214 to move up and down, moving the lifting plate 213 to the top of the top protective airbag 109 to limit and support the top of the glass. At the same time, the elastic force of the reinforcing spring 215 makes the reinforced support plate 216 fit against the sides of the glass, thereby limiting the glass. The support improves the stability of glass transportation. Finally, when the glass needs to be disassembled, the lifting knob 116 is turned to drive the lifting bidirectional threaded rod 117 to rotate, causing the two lifting threaded sleeves 118 to move relative to each other and simultaneously driving the lifting rotating rod 119 to rotate. This allows the lifting sliding sleeve 120 to slide relative to the outside of the lifting sliding rod 121, while adjusting the distance between the lifting support frame 122 and the lifting bracket 115. This allows the fixed bracket 106 to be lifted, loosening the fixed clamp 114 and facilitating the disassembly of the glass.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing 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 invention should be included within the protection scope of the present invention.

Claims

1. A packaging device for a glass cover, comprising a fixing mechanism (1) and a top protective airbag (109) mounted on top of the fixing mechanism (1). The fixing mechanism (1) is provided with a reinforcing mechanism (2) on its outer side, and lifting brackets (207) are provided on both sides of the reinforcing mechanism (2). Its features are, Also includes: The fixing mechanism (1) includes a packaging base (101), and a plurality of fixing base plates (102) are fixedly installed on the top of the packaging base (101). Fixing rotating rods (103) are symmetrically rotatably connected to both sides of the top of the fixing base plates (102). The top of the fixed rotating rod (103) is rotatably connected to a fixed sliding sleeve (104), and the inside of the fixed sliding sleeve (104) is slidably connected to a fixed sliding rod (105). Among them, a fixed bracket (106) is fixedly installed on the outside of the fixed sliding rod (105), and an installation groove (107) is opened in the center of the fixed bracket (106). A protective partition plate (108) is engaged and connected inside the installation groove (107), and the top protective airbag (109) is engaged and connected with the protective partition plate (108).

2. The packaging device for glass covers according to claim 1, characterized in that: A fixed spring (110) is fixedly installed on one side of the fixed sliding sleeve (104), and a fixed sliding plate (111) is fixedly installed on the top of the fixed sliding sleeve (104). An adjusting bolt (112) is threadedly connected inside the fixed sliding plate (111), and a protective spring (113) is rotatably connected to one end of the adjusting bolt (112). A fixed clamping plate (114) is fixedly installed on one side of the protective spring (113).

3. A packaging device for glass covers according to claim 2, characterized in that: The fixed bracket (106) has a lifting bracket (115) on both sides of its bottom. One end of the lifting bracket (115) is rotatably connected to a lifting knob (116). The inner side of the lifting knob (116) is fixedly connected to a lifting bidirectional threaded rod (117). The outer side of the lifting bidirectional threaded rod (117) is symmetrically threaded with a lifting threaded sleeve (118).

4. A packaging device for glass covers according to claim 3, characterized in that: The bottom of the lifting threaded sleeve (118) is rotatably connected to a lifting rotating rod (119), the bottom of the lifting rotating rod (119) is rotatably connected to a lifting sliding sleeve (120), the inside of the lifting sliding sleeve (120) is slidably connected to a lifting sliding rod (121), the outside of the lifting sliding rod (121) is fixedly installed with a lifting support frame (122), and the lifting support frame (122) is fixedly installed on both sides of the top of the fixed base plate (102).

5. A packaging device for glass covers according to claim 1, characterized in that: The reinforcement mechanism (2) includes a clamping bracket (201), which is symmetrically installed at the front and rear positions of the packaging base (101). A sprocket limiting frame (202) is fixedly installed at one end of each of the two clamping brackets (201). A clamping motor (203) is fixedly installed on one side inside the sprocket limiting frame (202). A sprocket transmission assembly (204) is fixedly connected to the output end of the clamping motor (203).

6. A packaging device for glass covers according to claim 5, characterized in that: One side of the sprocket drive assembly (204) is symmetrically connected with a clamping bidirectional threaded rod (205), and the outer sides of the two clamping bidirectional threaded rods (205) are symmetrically threaded with clamping threaded sleeves (206). The lifting bracket (207) is fixedly installed on the top of the clamping threaded sleeves (206), and a lifting motor (208) is fixedly installed on one side of the top of the lifting bracket (207). The output end of the lifting motor (208) is fixedly connected with a lifting rotating rod (209).

7. A packaging device for glass covers according to claim 6, characterized in that: The lifting rotating rod (209) is symmetrically equipped with bevel gear transmission assemblies (210) at both ends. The bottom of the bevel gear transmission assembly (210) is fixedly equipped with a lifting threaded rod (211). The outer sides of the two lifting threaded rods (211) are threaded with lifting threaded sleeves (212). A lifting plate (213) is fixedly installed between the two lifting threaded sleeves (212). A reinforcing side plate (214) is fixedly installed on one side of the bottom of the lifting plate (213). A reinforcing spring (215) is fixed around one side of the reinforcing side plate (214). A reinforcing support plate (216) is fixedly installed at the end of the reinforcing spring (215).