Safety protection net for building construction

Abstract

The application discloses a kind of safety protection net for building construction, specifically relates to safety protection net technical field, including support plate body, support plate body is provided with support protection component, support protection component includes the support concave frame of adjustable angle being set on support plate body, support concave frame is rectangular frame structure.The application is used by corresponding cooperation of each structure to adjust the protection area of device to adapt to different needs, is limited by limiting cross bar transversely, and X top rod is longitudinally limited, realizes multidirectional energy absorption force function, ensures that when buffer guard bar is impacted by different angles, force can be transported to attenuation ball, support plate body, first reinforced guard net frame, second reinforced guard net frame and third reinforced guard net frame can be embedded in support concave frame, improve the stability when each structure layer is stacked together, realize diversified protection function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety protection nets, more particularly, the present application relates to a safety protection net for building construction. BACKGROUND

[0002] Building construction refers to the production activities in the implementation phase of engineering construction, and is the construction process of various buildings. It can also be said that the process of turning various lines on design drawings into physical objects at designated locations. A safety net is a new type of building security product that provides protection, theft prevention, and falling object prevention for home life. It combines safety, aesthetics, and practicality, and represents the latest concept of home security in the 21st century. The safety protection net for building construction is mainly used in construction sites to prevent objects from falling and workers from falling.

[0003] Among them, the patent with patent announcement number CN216517033U discloses a safety protection net suitable for building construction, relating to the technical field of building construction, comprising a first protection net and a second protection net, the second protection net is fixedly arranged inside the first protection net, the bottom of the first protection net is provided with a buffer assembly, and the side of the first protection net and the side of the second protection net and the other side of the first protection net and the other side of the second protection net are all fixedly connected with a support plate.

[0004] The structure, when in use, is composed of reinforcing wires, buffer sponges, buffer springs, and wear-resistant layers. Since the first protection net and the second protection net are both made of stainless steel, and the reinforcing wires are made of nylon, the use strength of the first protection net and the second protection net can be improved. The buffer sponges and the buffer springs can provide corresponding buffering effects when a person or an object falls on the top of the first protection net and the second protection net. The first protection net and the second protection net are arranged in a cross and inclined manner, so as to improve the protection effect. However, the structure is not easy to adjust the protection area according to the needs, so that the device can only protect a certain place when in use, resulting in limitations of the device in use. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the present application provides a safety protection net for building construction, which aims to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a safety protection net for building construction, comprising a support plate body, wherein the support plate body is provided with a support protection assembly;

[0007] The support and protection assembly includes an angle-adjustable support recess frame disposed on the support plate. The support recess frame is a rectangular frame structure and is rotatably connected to the support plate. An angle-adjustable first reinforcing protective mesh frame is disposed between the support recess frame and the support plate. An angle-adjustable second reinforcing protective mesh frame is disposed on one side of the first reinforcing protective mesh frame, and an angle-adjustable third reinforcing protective mesh frame is disposed on one side of the second reinforcing protective mesh frame.

[0008] As can be seen, in the above technical solution, the first, second, and third reinforced protective net frames are angled by the axle pin side plate, so that the third reinforced protective net frame is superimposed on top of the second reinforced protective net frame, and the second reinforced protective net frame is superimposed on top of the first reinforced protective net frame. In this way, the first, second, and third reinforced protective net frames can be stacked together for protection, thereby achieving the function of centralized protection for a certain area.

[0009] Each of the first, second, and third reinforced protective net frames has a protective net frame in its middle, and each protective net frame has nylon side plates on both sides. Inside each protective net frame is a supporting inner frame, with several buffer strips in the middle of the supporting inner frame. Each buffer strip has a supporting column at its bottom. The buffer strips and supporting columns are arranged side-by-side, and the vertical cross-section of each buffer strip is arc-shaped. Several energy-absorbing balls are stacked on the supporting columns and are interconnected. Each energy-absorbing ball is filled with a non-Newtonian fluid. A damping ball is provided at the top of the energy-absorbing ball. The damping ball is located on top of the energy-absorbing ball. Both ends of the multiple buffer strips are provided with limit crossbars. A longitudinal damping strip is provided between each pair of adjacent limit crossbars. The multiple limit crossbars are installed on the support inner frame. An X-shaped top rod is provided between the damping ball and the support column. The vertical cross-section of the X-shaped top rod is X-shaped, and both sides of the X-shaped top rod extend to the adjacent damping ball and the support column, respectively. An energy-storing ball is provided in the middle of each of the multiple X-shaped top rods. A stop rod is provided at the bottom of each X-shaped top rod. Both ends of the stop rod extend to the two adjacent support columns, and a support bracket is provided at the top of the stop rod.

[0010] As can be seen, in the above technical solution, the protective mesh frame deforms first under force, transmitting the impact force to the buffer strip. The buffer strip's arc-shaped cross-section causes it to expand towards both ends when under force. The limiting crossbar limits its lateral movement, while the X-shaped top rod limits its longitudinal movement, achieving multi-directional energy absorption and force dissipation. This ensures that when the buffer strip is impacted at different angles, the force can be transmitted to the damping spheres. The damping spheres, when deformed under force, transmit pressure to the energy-absorbing spheres. Through the successive absorption and dissipation of energy by each energy-absorbing sphere, the intermolecular interactions within the non-Newtonian fluid inside the energy-absorbing spheres become tighter, forming a stronger structure. This makes the fluid more rigid while also absorbing a large amount of impact force, effectively preventing damage to the device due to large impact forces and improving the device's protective performance. Furthermore, the energy-absorbing spheres compress the X-shaped top rod when under force, facilitating force transmission and dispersion. The abutment and support brackets improve the stability of the support column and energy-absorbing sphere installation, preventing deformation due to impact forces that could affect the device's protective and impact-resistant performance.

[0011] Both sides of the inner wall of the supporting concave frame are rotatably connected to a first axle pin connecting rod via axle pins, and one end of each first axle pin connecting rod is rotatably connected to a second axle pin connecting rod via axle pins. The bottom of the second axle pin connecting rod extends to the supporting plate and is rotatably connected to the supporting plate via axle pins. A frame opening is provided through the supporting plate. One end of the first reinforced protective net frame, the second reinforced protective net frame, and the third reinforced protective net frame are rotatably connected via axle pin side plates. A limiting seat is provided on the outer side of the first reinforced protective net frame, and the limiting seat is installed on the supporting plate.

[0012] As can be seen, in the above technical solution, by adjusting the angles of the support plate and the support recess through the second and first axle pins, the support plate, the first reinforced protective mesh frame, the second reinforced protective mesh frame, and the third reinforced protective mesh frame can be embedded in the support recess, improving the stability when the various structures are stacked together. By adjusting the angles of the first reinforced protective mesh frame, the second reinforced protective mesh frame, and the third reinforced protective mesh frame through the axle pin side plate, the structures such as the first reinforced protective mesh frame, the second reinforced protective mesh frame, and the third reinforced protective mesh frame can be laid flat or unfolded in a folded manner to adjust the protective area of ​​the device and adapt to different needs.

[0013] The technical effects and advantages of this invention are as follows:

[0014] 1. The present invention uses the first, second, and third reinforced protective net frames to adjust their angles via the axle pin side plate, so that the third reinforced protective net frame is superimposed on top of the second reinforced protective net frame, and the second reinforced protective net frame is superimposed on top of the first reinforced protective net frame. This allows the first, second, and third reinforced protective net frames to be stacked together for protection, achieving the function of centralized protection for a certain area.

[0015] 2. The present invention adjusts the angles of the first, second, and third reinforced protective net frames via the axle pin side plate, thereby allowing the structures of the first, second, and third reinforced protective net frames to be laid flat or unfolded in a folded manner to adjust the protective area of ​​the device and adapt to different needs.

[0016] 3. The protective mesh frame of this invention first deforms under force to transfer the impact force to the buffer strip. Through the arc-shaped cross section of the buffer strip, the buffer strip expands towards its two ends when under force. The limiting crossbar limits its lateral movement, while the X-top bar limits its longitudinal movement, realizing the function of multi-directional energy absorption and force dissipation, ensuring that the buffer strip can transfer the force to the damping ball when it is hit by impacts at different angles.

[0017] 4. When the reducing ball is subjected to force and deformation, the pressure is transmitted to the energy-absorbing ball. After the energy-absorbing ball absorbs and dissipates the force step by step, the intermolecular interaction inside the non-Newtonian fluid in the energy-absorbing ball becomes more compact, forming a stronger structure. This effectively prevents the device from being damaged by large impact forces and improves the protective performance of the device.

[0018] 5. When the energy-absorbing ball of this invention is subjected to force, it compresses the X-shaped top rod, which facilitates the transmission and dispersion of force. The abutment rod and support bracket improve the stability of the support column and energy-absorbing ball installation, and prevent them from deforming due to impact force, which would affect the protective and impact-resistant performance of the device. The support plate, the first reinforced protective net frame, the second reinforced protective net frame and the third reinforced protective net frame can be embedded in the support recess, which improves the stability when the various structures are stacked together and realizes diversified protective functions.

[0019] In summary, through the coordinated use of various structures, the first, second, and third reinforced protective net frames can be stacked together for protection, achieving the function of centralized protection for a specific area. These structures can be laid flat or folded to adjust the protective area and adapt to different needs. When the buffer strip is subjected to force, it expands towards both ends, with the limiting crossbars providing lateral restraint and the X-shaped top rods providing longitudinal restraint, achieving multi-directional energy absorption and force dissipation. This ensures that when the buffer strip is impacted at different angles, the force is transferred to the energy-absorbing balls. Through the progressive energy absorption and force dissipation of each energy-absorbing ball, a stronger structure is formed, effectively preventing damage to the device due to large impact forces and improving its protective performance. The support plate, the first, second, and third reinforced protective net frames can be embedded within the support recess, improving the stability of the stacked structures and achieving diverse protective functions. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a side view of the overall structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the supporting concave frame, the protective mesh frame, the first reinforced protective mesh frame, the second reinforced protective mesh frame, and the third reinforced protective mesh frame of the present invention.

[0024] Figure 4 This is a side view of the protective mesh frame, supporting inner lining frame, supporting column, energy-absorbing ball, and buffer strip of the present invention.

[0025] Figure 5 This is a schematic diagram of the support column, the reducing ball, and the X-shaped top rod of the present invention.

[0026] Figure 6 This is a schematic diagram of the supporting inner frame, buffer strip, and limiting crossbar of the present invention.

[0027] Figure 7 For the present invention Figure 3 A schematic diagram of the partial structure at point A in the middle.

[0028] The attached figures are labeled as follows:

[0029] 1. Support plate; 101. Support recessed frame; 102. First reinforced protective mesh frame; 103. Second reinforced protective mesh frame; 104. Third reinforced protective mesh frame;

[0030] 2. Protective net frame; 201. Nylon side panel; 202. Supporting inner lining frame; 203. Buffer strip; 204. Support column; 205. Energy-absorbing ball; 206. Dissipating ball; 207. Limiting crossbar; 208. Longitudinal dissipating strip; 209. X-shaped top bar; 210. Energy-storing ball; 211. Support bar; 212. Support bracket;

[0031] 3. First shaft pin connecting rod; 301. Second shaft pin connecting rod; 302. Frame opening; 303. Shaft pin side plate; 304. Limiting seat. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] As attached Figures 1-7The safety net shown is for construction. Through the support and protection components installed on the support plate 1, the first reinforced safety net frame 102, the second reinforced safety net frame 103, and the third reinforced safety net frame 104 can be stacked together for protection, achieving the function of centralized protection for a certain area. The structures such as the first reinforced safety net frame 102, the second reinforced safety net frame 103, and the third reinforced safety net frame 104 can be laid flat or folded to adjust the protection area of ​​the device and adapt to different needs. When subjected to force, the buffer strip 203 expands towards its two ends, and is laterally limited by the limiting crossbar 207, while the X-shaped top bar... 209 then limits its longitudinal movement to achieve multi-directional energy absorption and force dissipation, ensuring that when the buffer strip 203 is impacted at different angles, the force can be transmitted to the damping ball 206. Through the energy absorption balls 205, energy is absorbed and force is dissipated step by step, forming a stronger structure. This effectively prevents the device from being damaged due to large impact forces, improving the protective performance of the device. The support plate 1, the first reinforced protective net frame 102, the second reinforced protective net frame 103, and the third reinforced protective net frame 104 can be embedded in the support recess 101, improving the stability when the various structures are stacked together, achieving diversified protective functions. The specific structural settings of the components are as follows.

[0036] The support and protection assembly includes an angle-adjustable support recess 101 disposed on the support plate 1. The support recess 101 is a rectangular frame structure and is rotatably connected to the support plate 1. An angle-adjustable first reinforcing protective mesh frame 102 is disposed between the support recess 101 and the support plate 1. An angle-adjustable second reinforcing protective mesh frame 103 is disposed on one side of the first reinforcing protective mesh frame 102, and an angle-adjustable third reinforcing protective mesh frame 104 is disposed on one side of the second reinforcing protective mesh frame 103.

[0037] Each of the first reinforced protective mesh frame 102, the second reinforced protective mesh frame 103, and the third reinforced protective mesh frame 104 has a protective mesh frame 2 in its middle, and each protective mesh frame 2 has nylon side plates 201 on both sides. Inside each protective mesh frame 2 is a supporting inner lining frame 202. Several buffer strips 203 are arranged in the middle of the supporting inner lining frame 202, and each buffer strip 203 has a supporting column 204 at its bottom. The buffer strips 203 and supporting columns 204 are arranged side-by-side, and the vertical cross-section of each buffer strip 203 is arc-shaped. Several energy-absorbing balls 205 are arranged on the supporting columns 204, and these balls are stacked and connected. Each energy-absorbing ball 205 is filled with a non-Newtonian fluid. A damping ball 206 is arranged at the top of the supporting column 204. The energy-absorbing ball 206 is located on top of the energy-absorbing ball 205. Both ends of the multiple buffer strips 203 are provided with limit crossbars 207. A longitudinal energy-absorbing strip 208 is provided between each pair of adjacent limit crossbars 207. The multiple limit crossbars 207 are all installed on the support inner frame 202. An X-shaped top rod 209 is provided between the multiple energy-absorbing balls 206 and the support column 204. The vertical cross-sectional shape of the X-shaped top rod 209 is set as X-shaped, and the two sides of the X-shaped top rod 209 extend to the adjacent energy-absorbing balls 206 and the support column 204 respectively. An energy-storing ball 210 is provided in the middle of the multiple X-shaped top rods 209, and a stop rod 211 is provided at the bottom of each X-shaped top rod 209. Both ends of the stop rod 211 extend to the two adjacent support columns 204 respectively, and a support bracket 212 is provided at the top of the stop rod 211.

[0038] Both sides of the inner wall of the support recess 101 are rotatably connected to the first shaft pin connecting rod 3 by shaft pins, and one end of each first shaft pin connecting rod 3 is rotatably connected to the second shaft pin connecting rod 301 by shaft pins. The bottom of the second shaft pin connecting rod 301 extends to the support plate 1 and is rotatably connected to the support plate 1 by shaft pins. A frame opening 302 is provided through the support plate 1. One end of the first reinforced protective net frame 102, the second reinforced protective net frame 103 and the third reinforced protective net frame 104 are rotatably connected by shaft pin side plates 303. A limiting seat 304 is provided on the outer side of the first reinforced protective net frame 102 and the limiting seat 304 is installed on the support plate 1.

[0039] When using the above structure, the staff installs the device at the designated location. When protecting the area that needs protection, the staff adjusts the angle of the first reinforced protective mesh frame 102, the second reinforced protective mesh frame 103, and the third reinforced protective mesh frame 104 through the axle pin side plate 303, so that the third reinforced protective mesh frame 104 is superimposed on top of the second reinforced protective mesh frame 103, and the second reinforced protective mesh frame 103 is superimposed on top of the first reinforced protective mesh frame 102. In this way, the first reinforced protective mesh frame 102, the second reinforced protective mesh frame 103, and the third reinforced protective mesh frame 104 can be stacked for protection, realizing the function of centralized protection for a certain area.

[0040] Meanwhile, when the device is in use, the angles of the first reinforced protective net frame 102, the second reinforced protective net frame 103, and the third reinforced protective net frame 104 can be adjusted via the axle pin side plate 303, thereby allowing the first reinforced protective net frame 102, the second reinforced protective net frame 103, and the third reinforced protective net frame 104 to be laid flat or unfolded in a folded manner to adjust the protective area of ​​the device and adapt to different needs.

[0041] Meanwhile, when the device is impacted by external forces, the protective mesh frame 2 deforms first, transmitting the impact force to the buffer strip 203. Through the arc-shaped cross section of the buffer strip 203, the buffer strip 203 expands towards its two ends when subjected to force. The limiting crossbar 207 limits its lateral movement, while the X-top bar 209 limits its longitudinal movement, realizing the function of multi-directional energy absorption and force dissipation, ensuring that the buffer strip 203 can transmit the force to the damping ball 206 when it is impacted at different angles.

[0042] When the damping ball 206 deforms under stress, it will transfer the stress to the energy-absorbing ball 205. The energy is absorbed and the force is dissipated step by step by each energy-absorbing ball 205. The intermolecular interactions inside the non-Newtonian fluid in the energy-absorbing ball 205 become tighter, forming a stronger structure. This makes the fluid harder and can absorb a large amount of impact force, effectively preventing the device from being damaged by large impact forces and improving the protective performance of the device.

[0043] Furthermore, when the energy-absorbing ball 205 is subjected to force, it presses against the X-shaped top rod 209, which facilitates the transmission and dispersion of force. Meanwhile, the abutment rod 211 and the support bracket 212 improve the stability of the support column 204 and the energy-absorbing ball 205 during installation, preventing them from being deformed by impact force and affecting the protective and impact-resistant performance of the device.

[0044] Furthermore, when the device is providing protection, the angles of the support plate 1 and the support recess 101 are adjusted by the second shaft pin connecting rod 301 and the first shaft pin connecting rod 3, so that the support plate 1, the first reinforced protective net frame 102, the second reinforced protective net frame 103 and the third reinforced protective net frame 104 can be embedded in the support recess 101, thereby improving the stability of the various structures when they are stacked together.

[0045] Unlike existing technologies, this application discloses a safety net for construction, which uses a first reinforcing net frame 102, a second reinforcing net frame 103, and a third reinforcing net frame 104 stacked together to provide concentrated protection for a specific area. These structures can be laid flat or folded to adjust the protective area and adapt to different needs. The buffer strips 203 expand towards their ends under stress, and are laterally limited by the limiting crossbars 207. The X-shaped top rod 209 limits its longitudinal movement, achieving multi-directional energy absorption and force dissipation. This ensures that when the buffer strip 203 is impacted at different angles, the force can be transmitted to the damping ball 206. Through the energy-absorbing balls 205, energy is absorbed and force is dissipated step by step, forming a stronger structure. This effectively prevents the device from being damaged due to large impact forces, improving the device's protective performance. The support plate 1, the first reinforced protective net frame 102, the second reinforced protective net frame 103, and the third reinforced protective net frame 104 can be embedded in the support recess 101, improving the stability of the various structures when they are stacked together and achieving diversified protective functions.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. 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 safety fence for construction work, comprising a support plate body (1), characterized in that: The support plate body (1) is provided with a support protection assembly; The support protection assembly comprises an angle-adjustable support concave frame (101) arranged on the support plate body (1), wherein the support concave frame (101) is a rectangular frame structure, and the support concave frame (101) is rotationally connected with the support plate body (1); an angle-adjustable first reinforcing guard net rack (102) is arranged between the support concave frame (101) and the support plate body (1); one side of the first reinforcing guard net rack (102) is provided with an angle-adjustable second reinforcing guard net rack (103); and one side of the second reinforcing guard net rack (103) is provided with an angle-adjustable third reinforcing guard net rack (104). The middle parts of the first reinforcing guard net rack (102), the second reinforcing guard net rack (103) and the third reinforcing guard net rack (104) are provided with guard net frames (2), and both sides of each guard net frame (2) is provided with a nylon side plate (201); the inside of each guard net frame (2) is provided with a support lining frame (202); the middle part of the support lining frame (202) is provided with a plurality of buffer guard strips (203); and the bottom of each buffer guard strip (203) is provided with a support column (204). The plurality of buffer guard strips (203) and support columns (204) are arranged side by side, and the vertical cross-sectional shape of each buffer guard strip (203) is arc-shaped. The support column (204) is provided with a plurality of energy-absorbing balls (205), and each energy-absorbing ball (205) is stacked; the plurality of energy-absorbing balls (205) are connected; each energy-absorbing ball (205) is filled with a non-Newtonian fluid; the top end of the support column (204) is provided with a reduction ball (206); the reduction ball (206) is located at the top of the energy-absorbing ball (205); and the reduction ball (206) is deformable under stress. An X-shaped top rod (209) is arranged between the reduction ball (206) and the support column (204), and the vertical cross-sectional shape of the X-shaped top rod (209) is X-shaped; and the two sides of the X-shaped top rod (209) extend to the adjacent reduction ball (206) and support column (204). The middle part of each X-shaped top rod (209) is provided with an energy storage ball (210), and the bottom of each X-shaped top rod (209) is provided with a stop rod (211).

2. The safety fence according to claim 1, wherein: The two ends of each buffer guard strip (203) are provided with a limiting horizontal rod (207), and a longitudinal reduction strip (208) is arranged between each two adjacent limiting horizontal rods (207); and the plurality of limiting horizontal rods (207) are mounted on the support lining frame (202).

3. The safety fence according to claim 1, wherein: The two ends of the stop rod (211) extend to the adjacent two support columns (204), and the top of the stop rod (211) is provided with a support bracket (212).

4. The safety fence according to claim 1, wherein: The inner walls of the support concave frame (101) are rotationally connected with first shaft pin connecting rods (3) through shaft pins, and one end of each first shaft pin connecting rod (3) is rotationally connected with a second shaft pin connecting rod (301) through a shaft pin.

5. The safety fence according to claim 4, wherein: The bottom of the second shaft pin connecting rod (301) extends to the support plate body (1) and is rotatably connected with the support plate body (1) through a shaft pin, and a frame opening (302) is formed through the support plate body (1).

6. The safety fence according to claim 1, wherein: One end of the first reinforcing guard net frame (102), the second reinforcing guard net frame (103) and the third reinforcing guard net frame (104) are rotatably connected through a shaft pin side plate (303), the outer side of the first reinforcing guard net frame (102) is provided with a limiting seat (304), and the limiting seat (304) is installed on the support plate body (1).

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