A rapid detection device for hollow spots in wall decoration

Abstract

This invention belongs to the field of detection technology, and particularly relates to a rapid detection device for hollow spots in wall decoration. The rapid detection device for hollow spots in wall decoration includes a first extension component, a second extension component, two scraping mechanisms, and a sound-amplifying component. Each scraping mechanism includes a wiping component and a scraping component. The first extension component extends the detection device, allowing inspectors to detect hollow spots on higher surfaces. The second extension component further extends the detection device and also shaped it into an inverted L-shape. The scraping components remove protrusions on the wall surface, the wiping components clear the path of the detection device, and the sound-amplifying component amplifies the friction sound between the detection device and the wall. This invention has an ingenious structure, enabling it to remove protrusions in front of the wall before detection, simultaneously clearing the path, and amplifying the friction sound, allowing inspectors to more clearly determine whether hollow spots exist in the wall.

Description

Technical Field

[0001] This invention relates to the field of detection technology, and in particular to a rapid detection device for hollow spots in wall decoration. Background Technology

[0002] Hollow surface detection devices generally refer to equipment used in building construction to inspect the quality of walls or floors. These devices can detect problems such as hollow areas and cracks in walls or floors, helping engineers and technicians to identify and resolve these issues promptly, ensuring the building meets quality standards. However, current wall hollow surface detection devices are difficult to detect in noisy environments, and the devices are easily scratched during testing. Summary of the Invention

[0003] Therefore, it is necessary to provide a rapid detection device for hollow spots in wall decoration to solve at least one of the above-mentioned technical problems.

[0004] A rapid detection device for hollow spots in wall decoration includes a first extension component, a second extension component, two scraping mechanisms, and a sound-speaking component. The bottom of the second extension component is hinged to the top of the first extension component. The two scraping mechanisms are installed on both sides of the top of the second extension component, and the sound-speaking component is installed on one side of the top of the second extension component. Each scraping mechanism includes a wiping component and a scraping component. The wiping component is installed on one side of the top of the second extension component, and the scraping component is located on the side of the wiping component away from the top of the second extension component.

[0005] The first extension component extends the detection device, allowing inspectors to test high-positioned surfaces. The second extension component further extends the detection device and also allows it to be shaped like an inverted L for testing in confined spaces. The scraping component removes protrusions from the wall, and the wiping component cleans the path of the detection device, improving its efficiency. The amplifying component amplifies the friction sound between the detection device and the wall, making it easier for inspectors to identify hollow areas in the wall.

[0006] In one embodiment, the first extension assembly includes a handle segment, a first extension segment, a second extension segment, a hinge segment, and a sponge handle sleeve. The first extension segment is slidably inserted inside the handle segment, the second extension segment is slidably inserted inside the first extension segment, the hinge segment is slidably inserted into the second extension segment, the sponge handle sleeve is fitted into the handle segment, and a switch is installed in the middle of the handle segment.

[0007] In one embodiment, the bottom of the handle section is also provided with a lanyard hole, through which the lanyard is threaded, and the top of the hinge section is provided with a hinge interface.

[0008] In one embodiment, the second extension assembly includes a fixed section, a first extension section, a second extension section, and a rapid detection ball connected in sequence. The fixed section is hinged to the hinge section. The first extension section is slidably inserted inside the fixed section. The second extension section is slidably inserted inside the first extension section. The rapid detection ball is fixedly installed on the top of the second extension section.

[0009] In one embodiment, the wiping assembly includes a fixed rod and a brush. The lower end of the fixed rod is fixedly connected to the middle of the second extension section, and the bottom of the brush is fixedly connected to the upper end of the fixed rod. The brush includes a support section and a brush section. The bottom of the support section is fixedly connected to the upper end of the fixed rod, and the brush section is inserted into the side wall of the support section. The brush section gradually increases in length from top to bottom, forming a right-angled trapezoidal shape. This is used to reduce the friction between the detection device and the brush section when the detection device slides on the wall at an angle during detection.

[0010] In one embodiment, the fixing rod includes a first horizontal segment, a first arc segment, and a first vertical segment made of flexible material connected in sequence. One end of the first horizontal segment is fixedly connected to the middle of the second extended segment, the lower end of the first arc segment is fixedly connected to the first horizontal segment, the lower end of the first vertical segment is fixedly connected to the upper end of the first arc segment, and the upper end is fixedly connected to the bottom of the support segment.

[0011] In one embodiment, the scraping assembly includes a support rod and an inclined scraping blade. The lower end of the support rod is fixedly connected to the middle of the second extension section, and the support rod is located below the fixed rod. The bottom end of the scraping blade away from the wall is fixedly connected to the upper end of the fixed rod. The scraping blade includes an integrally formed scraping end and a sweeping end. The scraping end is located at the end adjacent to the wall, and the sweeping end is located at the end away from the wall.

[0012] In one embodiment, the support rod includes a second horizontal segment, a second arc segment, and a second vertical segment made of flexible material connected in sequence. One end of the second horizontal segment is fixedly connected to the middle of the second extended segment, and the second horizontal segment is located below the first horizontal segment. The lower end of the second arc segment is fixedly connected to the second horizontal segment. The lower end of the second vertical segment is fixedly connected to the upper end of the second arc segment, and the upper end of the second vertical segment is fixedly connected to the bottom of the scraping blade.

[0013] In one embodiment, the speaker assembly includes a hinge and a speaker, the hinge being hinged to the top of a second extension, the speaker being mounted on the side of the hinge away from the wall, and the speaker being electrically connected to a switch.

[0014] In one embodiment, the hinge includes a hinge rod and a U-shaped sound-gathering frame. The hinge rod rotatably passes through the top of the second extension section. The sound-gathering frame includes two vertical plates and a horizontal plate connected in sequence. The lower ends of the two vertical plates are fixedly connected to the two ends of the hinge rod, and the two ends of the horizontal plate are fixedly connected to the upper ends of the two vertical plates.

[0015] This invention, by incorporating a first extension component, allows for adjustment of the detection length of the detection device, facilitating the inspection of high-level walls. The scraping component's scraping blade, when the rapid detection ball contacts the wall, presses the second vertical section of the support rod against the wall, reducing the angle between the scraping blade and the wall. This allows the scraping end of the blade to approach the wall, agitating the brush section and dislodging dust, resulting in a more thorough cleaning. Furthermore, the brush section of the wiping component, with its progressively longer, right-angled trapezoidal shape, adheres well to the wall, preventing excessive branching at the top and reducing brush lifespan. This also minimizes friction between the brush and the wall, making the detection device more labor-saving. The brush section also cleans the dust scraped off by the scraper, preventing it from adhering to the rapid detection ball as it passes through, thus avoiding interference with the sound emitted by the ball against the wall. By incorporating a speaker, when the operator grips the handle section and presses the switch within it, the speaker on the speaker unit activates. By pressing the rapid detection ball against the wall and moving the handle section left and right or forward, the ball moves along the wall, amplifying the sound of the ball rubbing against the wall through the speaker. This prevents the sound from being indistinguishable in noisy environments. The second extension component further extends the length of the detection device. When inspecting particularly confined spaces, by adjusting the fixed section, the entire device can be shaped into an inverted L-shape, eliminating the need for the operator to change position and facilitating the inspection of corners. This invention has a clever structure that can remove protrusions in front of the detection device before it detects the wall surface, and simultaneously clear the path of movement. It can also amplify the friction sound of the detection device, so that the inspectors can more clearly determine whether there are hollow spots on the wall surface. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of one embodiment.

[0017] Figure 2 As an example Figure 1 Enlarged diagram of point A in the middle.

[0018] In the diagram: 10. First extension assembly; 11. Handle section; 12. First extension section; 13. Second extension section; 14. Hinge section; 15. Sponge handle sleeve; 16. Hanging lanyard hole; 140. Hinge interface; 20. Second extension assembly; 21. Fixing section; 22. First extension section; 23. Second extension section; 24. Rapid detection ball; 30. Scraping mechanism; 31. Wiping assembly; 32. Scraping assembly; 310. Fixing rod; 311. Brush; 312. 313 Support section; 314 Brush section; 315 First horizontal section; 316 First arc-shaped section; 317 First vertical section; 320 Support rod; 321 Scraper blade; 322 Second arc-shaped section; 323 Second vertical section; 324 Second horizontal section; 325 Scraper end; 326 Sweeping end; 40 Speaker assembly; 41 Hinge; 42 Loudspeaker; 410 Hinge rod; 411 Sound box; 412 Vertical plate; 413 Horizontal plate. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] One embodiment provided by the present invention, such as Figures 1 to 2As shown, a rapid detection device for hollow spots in wall decoration is provided, which includes a first extension component 10, a second extension component 20, two scraping mechanisms 30 and a sound-speaking component 40. The bottom of the second extension component 20 is hinged to the top of the first extension component 10. The two scraping mechanisms 30 are installed on both sides of the top of the second extension component 20, and the sound-speaking component 40 is installed on one side of the top of the second extension component 20. Each scraping mechanism 30 includes a wiping component 31 and a scraping component 32. The wiping component 31 is installed on one side of the top of the second extension component 20, and the scraping component 32 is located on the side of the wiping component 31 away from the top of the second extension component 20.

[0023] The first extension component 10 extends the detection device, enabling inspectors to detect high-positioned surfaces. The second extension component 20 further extends the detection device and also allows it to be shaped like an inverted L for detecting in confined spaces. The scraping component 32 scrapes away protrusions on the wall. The wiping component 31 cleans the path of the detection device, improving its detection efficiency. The amplifying component 40 amplifies the friction sound between the detection device and the wall, making it easier for inspectors to identify whether there are hollow spots on the wall.

[0024] like Figure 1 As shown, the first extension assembly 10 includes a handle section 11, a first extension section 12, a second extension section 13, a hinge section 14, and a sponge handle sleeve 15. The first extension section 12 is slidably inserted into the handle section 11, the second extension section 13 is slidably inserted into the first extension section 12, the hinge section 14 is slidably inserted into the second extension section 13, and the sponge handle sleeve 15 is fitted into the handle section 11. A switch (not shown) is installed in the middle of the handle section 11.

[0025] like Figure 1 As shown, a lanyard hole 16 is also installed at the bottom of the handle section 11, and the lanyard is threaded through the lanyard hole 16. A hinge interface 140 is provided at the top of the hinge section 14.

[0026] like Figure 1 and Figure 2 As shown, the second extension assembly 20 includes a fixed section 21, a first extension section 22, a second extension section 23 and a rapid detection ball 24 connected in sequence. The fixed section 21 is hinged to the hinge section 14. The first extension section 22 is slidably inserted into the interior of the fixed section 21. The second extension section 23 is slidably inserted into the interior of the first extension section 22. The rapid detection ball 24 is fixedly installed on the top of the second extension section 23.

[0027] like Figure 1 and Figure 2As shown, the wiping assembly 31 includes a fixing rod 310 and a brush 311. The lower end of the fixing rod 310 is fixedly connected to the middle part of the second extension section 23, and the bottom of the brush 311 is fixedly connected to the upper end of the fixing rod 310. The brush 311 includes a support section 312 and a brush section 313. The bottom of the support section 312 is fixedly connected to the upper end of the fixing rod 310, and the brush section 313 is inserted into the side wall of the support section 312. The brush section 313 gradually increases in length from top to bottom and is in the shape of a right-angled trapezoid. This is used to reduce the friction between the detection device and the brush section 313 when the detection device is tilted and slid against the wall during detection.

[0028] like Figure 1 and Figure 2 As shown, the fixing rod 310 includes a first horizontal segment 314, a first arc segment 315 and a first vertical segment 316 made of flexible material connected in sequence. One end of the first horizontal segment 314 is fixedly connected to the middle of the second extension segment 23. The lower end of the first arc segment 315 is fixedly connected to the first horizontal segment 314. The lower end of the first vertical segment 316 is fixedly connected to the upper end of the first arc segment 315, and the upper end is fixedly connected to the bottom of the support segment 312.

[0029] like Figure 1 and Figure 2 As shown, the scraping assembly 32 includes a support rod 320 and an inclined scraping blade 321. The lower end of the support rod 320 is fixedly connected to the middle of the second extension section 23, and the support rod 320 is located below the fixed rod 310. The bottom end of the scraping blade 321 away from the wall is fixedly connected to the upper end of the fixed rod 310. The scraping blade 321 includes an integrally formed scraping end 325 and a sweeping end 326. The scraping end 325 is located at the end adjacent to the wall, and the sweeping end 326 is located at the end away from the wall.

[0030] like Figure 1 and Figure 2 As shown, the support rod 320 includes a second horizontal segment 324, a second arc-shaped segment 322, and a second vertical segment 323 made of flexible material connected in sequence. One end of the second horizontal segment 324 is fixedly connected to the middle of the second extension segment 23, and the second horizontal segment 324 is located below the first horizontal segment 314. The lower end of the second arc-shaped segment 322 is fixedly connected to the second horizontal segment 324. The lower end of the second vertical segment 323 is fixedly connected to the upper end of the second arc-shaped segment 322, and the upper end of the second vertical segment 323 is fixedly connected to the bottom of the scraper 321.

[0031] like Figure 1 and Figure 2 As shown, the speaker assembly 40 includes a hinge 41 and a speaker 42. The hinge 41 is hinged to the top of the second extension 23. The speaker 42 is mounted on the side of the hinge 41 away from the wall and is electrically connected to a switch.

[0032] As Figure 1 and Figure 2 shown, the hinge member 41 includes a hinge rod 410 and a sound-collecting frame 411 in the shape of "冂". The hinge rod 410 rotatably penetrates through the top of the second extension section 23. The sound-collecting frame 411 includes two vertical plates 412 and a horizontal plate 413 connected in sequence. The lower ends of the two vertical plates 412 are respectively fixedly connected to both ends of the hinge rod 410, and both ends of the horizontal plate 413 are respectively fixedly connected to the upper ends of the two vertical plates 412.

[0033] During installation: Install the two scraping mechanisms 30 on both sides of the top of the second extension component 20, install the sound amplification component 40 on one side of the top of the second extension component 20, install the wiping component 31 on one side of the top of the second extension component 20, fixedly install the quick detection ball 24 on the top of the second extension section 23, and install the loudspeaker 42 on one side of the hinge member 41.

[0034] During use: 1. Extend the second extension component 20 to the desired length, press the quick detection ball 24 against the wall surface, shake it left and right or move the handle section 11 forward. The quick detection ball 24 will move on the wall surface following the retractable handle section 11. When the quick detection ball 24 abuts against the wall surface, the wiping component 31 and the scraping component 32 of the scraping mechanism 30 will also abut against the wall surface. The second vertical section 323 of the support rod 320 is pressed against the wall surface by force, causing the angle between the scraping blade 321 and the wall surface to become smaller, and further causing the sweeping end 326 of the scraping blade 321 to approach the wall surface. When the sweeping end 326 approaches the wall surface, the sweeping end 326 will拨动 the brush section 313, causing the dust adhering to the brush section 313 to fall off, enabling the brush section 313 to clean more thoroughly. At the same time, when scraping the bumps on the wall surface, the second vertical section 323 is made of a flexible material, so that when the scraping blade 321 abuts against the bump, the scraping blade 321 can approach the brush section 313, further拨动 the brush section 31, causing the dust adhering to the brush section 313 to fall off, enabling the brush section 313 to clean more thoroughly. The brush section 313 follows the quick detection ball 24 to abut against the wall surface. Also, since the brush section 313 gradually becomes longer from top to bottom in a right trapezoidal shape, the brush section 313 can well adhere to the wall surface, preventing the upper end of the brush section 313 from being too long and causing too much bifurcation of the brush section 313, thereby reducing the service life of the brush section 313 and at the same time reducing the friction between the brush section 313 and the wall surface, making the detection device more labor-saving. When the scraping blade 321 moves forward, it will scrape the bumps on the wall surface, making the wall surface flat. At the same time, when the quick detection ball 24 can move on the flat wall surface, it prevents the quick detection ball 24 from being bumped and scratched, thereby affecting the use effect.

[0035] 2. When the inspector grips the handle section 11, pressing the switch in the handle section 11 activates the speaker 42 on the speaker assembly 40. The rapid detection ball 24 is then pressed against the wall. By swaying the handle section 11 left and right or moving it forward, the rapid detection ball 24 moves along the wall, amplifying the sound of the ball 24 rubbing against the wall through the speaker 42. This prevents the sound from being indistinguishable in noisy environments. Simultaneously, the sound-gathering frame 411 of the hinge 41 gathers some of the sound from the ball 24 rubbing against the wall and transmits it to the speaker 42, making the sound louder and allowing the inspector to hear it more clearly. Furthermore, when inspecting confined spaces, by moving the fixing section 21, the entire inspection device can be shaped into an inverted L-shape, eliminating the need for the inspector to change position and facilitating the inspection of corners.

[0036] Beneficial effects: By providing the first extension component 10, the present invention can change the detection length of the detection device, making it convenient for inspectors to inspect high-level walls. By providing the scraping blade 321 of the scraping component 32, when the rapid detection ball 24 abuts against the wall, the second vertical section 323 of the support rod 320 is pressed against the wall, causing the angle between the scraping blade 321 and the wall to decrease, thereby bringing the sweeping end 326 of the scraping blade 321 closer to the wall. When the sweeping end 326 is close to the wall, it will agitate the brush section 313, causing the dust adhering to the brush section 313 to fall off, making the brush section 313 cleaner. By designing the brush segment 313 of the wiping assembly 31 to gradually increase in length from top to bottom in a right-angled trapezoidal shape, the brush segment 313 can adhere well to the wall surface. This prevents the upper end of the brush segment 313 from becoming too long and branching excessively, thus reducing its lifespan. Simultaneously, it reduces friction between the brush segment 313 and the wall surface, making the detection device more labor-saving. The brush segment 313 also cleans the dust scraped by the scraper blade 321, preventing the dust from adhering to the rapid detection ball 24 as it passes through, thus avoiding interference with the sound emitted by the rapid detection ball 24 on the wall. By incorporating a speaker 42, when the inspector grips the handle section 11, pressing the switch within 11 activates the speaker 42 on the speaker assembly 40. This causes the rapid detection ball 24 to be pressed against the wall. By swaying the handle section 11 left and right or moving it forward, the ball moves along the wall, amplifying the sound of its friction against the wall through the speaker 42. This prevents the sound from being indistinguishable in noisy environments. The second extension assembly 20 further extends the length of the detection device. When inspecting narrow spaces, the fixed section 21 can be manipulated to form an inverted L-shape, eliminating the need for the inspector to change position and facilitating the inspection of corners. This invention is ingeniously designed, clearing protrusions in front of the wall before inspection and simultaneously cleaning the path. It also amplifies the friction sound, allowing inspectors to more clearly determine if there are hollow areas in the wall.

[0037] All possible combinations of the various technical features in the above embodiments are described; however, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above embodiments are merely illustrative of several implementations of the present invention, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A device for quickly detecting wall decoration hollowing, characterized in that, The utility model provides a detection device, including first extension component (10), second extension component (20), two scraping mechanism (30) and loudspeaker component (40), the bottom of second extension component (20) is hinged with the top of first extension component (10), two scraping mechanism (30) are installed in the both sides of second extension component (20) top, and loudspeaker component (40) is installed in second extension component (20) top one side, and each scraping mechanism (30) includes wiping component (31) and scraping component (32), wiping component (31) is installed in second extension component (20) top one side, and scraping component (32) is located wiping component (31) away from second extension component (20) top one side, and second extension component (20) includes fixed section (21), first extension section (22), second extension section (23) and rapid detection ball (24) connected in proper order, and fixed section (21) is hinged with hinge section (14), and first extension section (22) is slidably inserted in the inside of fixed section (21), and second extension section (23) is slidably inserted in the inside of first extension section (22), and rapid detection ball (24) is fixedly installed in second extension section (23) top, and wiping component (31) includes fixed rod (310) and brush (311), and the lower end of fixed rod (310) is fixedly connected with the middle part of second extension section (23), and the bottom of brush (311) is fixedly connected with the upper end of fixed rod (310), and brush (311) includes support section (312) and brush section (313), and the bottom of support section (312) is fixedly connected with the upper end of fixed rod (310), and brush section (313) is inserted on the side wall of support section (312), and brush section (313) is gradually lengthened from top to bottom and is in the shape of right-angled trapezoid, for when detecting, the detection device is inclined and slides on the wall, can reduce the friction between the detection device and brush section (313), and fixed rod (310) includes first horizontal section (314), first arc section (315) and first vertical section (316) made of flexible material connected in proper order, and one end of first horizontal section (314) is fixedly connected with the middle part of second extension section (23), and the lower end of first arc section (315) is fixedly connected with first horizontal section (314), and the lower end of first vertical section (316) is fixedly connected with the upper end of first arc section (315), and the upper end is fixedly connected with the bottom of support section (312), and scraping component (32) includes support rod (320) and inclined scraping sheet (321), and the lower end of support rod (320) is fixedly connected with the middle part of second extension section (23), and support rod (320) is located below fixed rod (310), and the bottom of scraping sheet (321) is fixedly connected with the upper end of fixed rod (310) away from the wall, and scraping sheet (321) includes integrated scraping end (325) and sweeping end (326), and scraping end (325) is located adjacent to the wall, and sweeping end (326) is located away from the wall.

2. The device for rapid detection of wall decoration hollowing according to claim 1, characterized in that: The first extension assembly (10) comprises a handle section (11), a first extension section (12), a second extension section (13), a hinge section (14) and a sponge handle sleeve (15), the first extension section (12) is slidingly inserted into the handle section (11), the second extension section (13) is slidingly inserted into the first extension section (12), the hinge section (14) is slidingly inserted into the second extension section (13), the sponge handle sleeve (15) is sleeved on the handle section (11), and a switch is mounted on the middle portion of the handle section (11).

3. The device for rapid detection of wall decoration hollowing according to claim 2, characterized in that: A hanging rope hole (16) is further mounted on the bottom of the handle section (11), the hanging rope is inserted into the hanging rope hole (16), and a hinge hole (140) is formed in the top of the hinge section (14).

4. The device for rapid detection of wall decoration hollowing according to claim 3, characterized in that: The supporting rod (320) comprises a second horizontal section (324), a second arc-shaped section (322) and a second vertical section (323) made of flexible material and connected in sequence, one end of the second horizontal section (324) is fixedly connected with the middle portion of the second extension section (23), the second horizontal section (324) is located below the first horizontal section (314), the lower end of the second arc-shaped section (322) is fixedly connected with the second horizontal section (324), the lower end of the second vertical section (323) is fixedly connected with the upper end of the second arc-shaped section (322), and the upper end of the second vertical section (323) is fixedly connected with the bottom of the scraping piece (321).

5. The device for rapid detection of wall decoration hollowing according to claim 4, characterized in that: The loudspeaker assembly (40) comprises a hinge piece (41) and a loudspeaker (42), the hinge piece (41) is hingedly connected with the top of the second extension section (23), the loudspeaker (42) is mounted on the side, away from the wall, of the hinge piece (41), and the loudspeaker (42) is electrically connected with the switch.

6. The device for rapid detection of wall decoration hollowing according to claim 5, characterized in that: The hinge piece (41) comprises a hinge rod (410) and a "n" shaped sound collecting frame (411), the hinge rod (410) is rotatably inserted into the top of the second extension section (23), the sound collecting frame (411) comprises two vertical plates (412) and a horizontal plate (413) connected in sequence, the lower ends of the two vertical plates (412) are fixedly connected with the two ends of the hinge rod (410) respectively, and the two ends of the horizontal plate (413) are fixedly connected with the upper ends of the two vertical plates (412) respectively.

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