Warning device for safety helmet wearing

Abstract

The utility model discloses a warning device for wearing a safety helmet. The warning device comprises a warning box body, supporting legs, a dynamic warning demonstration assembly, a positioning assembly and a warning plate, the warning box body is of a hollow box body structure with an opening in the front end, and the multiple supporting legs are fixedly installed at the bottom of the warning box body respectively, so that the warning box body is erected above the ground through the multiple supporting legs; the dynamic warning demonstration assembly is detachably arranged in the warning box body, the positioning assemblies are movably arranged at the bottom of the warning box body, and the positioning assemblies penetrate through a bottom plate of the warning box body and are clamped on the two sides of the bottom of the dynamic warning demonstration assembly; the warning board is fixedly installed on the top of the warning box body, and a warning slogan is arranged on the warning board. The utility model relates to the technical field of safety warning equipment, and can solve the problem that in the prior art, the warning effect is poor when a safety helmet is worn by a warning slogan at an entrance of a place.

Description

Technical Field

[0001] The utility model relates to the technical field of safety warning devices, in particular to a warning device for helmet wearing. Background Art

[0002] In construction sites, factories and other construction and production places, safety accidents of falling objects injuring people often occur. Therefore, wearing a safety helmet is an important protection measure for operators during construction and production. However, due to the inconvenience of wearing and carrying the safety helmet or forgetting it, the situation of entering the construction and production places without wearing a safety helmet occurs from time to time, and there are relatively large potential safety hazards.

[0003] At present, warning slogans reminding to wear a safety helmet are usually set at the entrances of construction and production places, but the warning effect of the warning slogans is not good. Construction workers are easy to ignore them when passing by, and they cannot play an intuitive warning effect. Therefore, it is necessary to provide a warning device for helmet wearing, which can solve the problem that the warning effect of the warning slogan for helmet wearing at the entrance of the existing place is not good. Summary of the Invention

[0004] The purpose of the utility model is to provide a warning device for helmet wearing, which can solve the problem that the warning effect of the warning slogan for helmet wearing at the entrance of the existing place is not good.

[0005] The utility model is realized as follows:

[0006] A warning device for helmet wearing includes a warning box body, support legs, a dynamic warning demonstration component, a positioning component and a warning board; the warning box body is a hollow box body structure with an open front end, and several support legs are respectively fixedly installed at the bottom of the warning box body, so that the warning box body is erected above the ground through several support legs; the dynamic warning demonstration component is detachably arranged in the warning box body, the positioning component is movably arranged at the bottom of the warning box body, and the positioning component penetrates through the bottom plate of the warning box body and is clamped on both sides of the bottom of the dynamic warning demonstration component; the warning board is fixedly installed at the top of the warning box body, and a warning slogan is arranged on the warning board.

[0007] The dynamic warning demonstration component includes a connecting bottom plate, a first human model, a second human model, a safety helmet body, a first demonstration rod and a second demonstration rod; the connecting bottom plate is clamped on the inner bottom plate of the warning box body through the positioning component, the first human model and the second human model are respectively fixedly arranged on the connecting bottom plate, the top of the first human model wears the safety helmet body, and a groove is formed on the top of the second human model; the first demonstration rod and the second demonstration rod are vertically movable on the inner top plate of the warning box body, so that the lower end of the first demonstration rod can abut against the top of the safety helmet body, and the lower end of the second demonstration rod can be inserted into the groove.

[0008] An inverted U-shaped bracket is installed on the connecting base plate, and a reciprocating telescopic rod is installed at the top of the inverted U-shaped bracket. The telescopic end of the reciprocating telescopic rod penetrates through the top rod of the inverted U-shaped bracket and is connected to the linkage plate. The upper ends of the first demonstration rod and the second demonstration rod are respectively installed at both ends of the linkage plate, so that the lower end surface of the first demonstration rod is arranged in a liftable manner facing the safety helmet body, and the lower end surface of the second demonstration rod is arranged in a liftable manner facing the groove.

[0009] A pair of limit posts are installed on the connecting base plate, and the pair of limit posts are respectively located inside the two side rods of the inverted U-shaped bracket. Extension plates are respectively formed at both ends of the linkage plate, and the two extension plates are respectively slidably sleeved on the pair of limit posts through collar rings.

[0010] A sleeve is provided at one end of the linkage plate where the first demonstration rod is installed. A spring is installed inside the sleeve, and the upper end of the first demonstration rod is elastically inserted into the sleeve through the spring.

[0011] Limit blocks are respectively provided on the inner walls of both sides of the warning box body, and the limit blocks can be in contact connection with the side ends of the connecting base plate.

[0012] A pair of through holes are provided on the bottom plate of the warning box body. The positioning assembly includes a pair of positioning plates. The lower ends of the pair of positioning plates are respectively movably arranged below the warning box body. The upper ends of the pair of positioning plates respectively penetrate through the bottom plate of the warning box body through the pair of through holes and are clamped and connected to both side ends of the connecting base plate.

[0013] The positioning assembly further includes a strip-shaped plate and a lead screw. The strip-shaped plate is fixedly arranged on the bottom surface of the bottom plate of the warning box body. The strip-shaped plate is a hollow strip-shaped frame with an open bottom. The lead screw is rotatably installed inside the strip-shaped plate. One end of the lead screw extends to the outside of the strip-shaped plate and is externally connected to a rotating mechanism. The positioning plates are in an L-shaped structure. One ends of the horizontal sections of the pair of positioning plates are respectively threadedly and movably screwed onto the lead screw. The upper ends of the vertical sections of the pair of positioning plates respectively extend to the outer sides of both sides of the strip-shaped plate and penetrate through the bottom plate of the warning box body through the pair of through holes and then are clamped and connected to both side ends of the connecting base plate.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. Since the utility model is provided with a dynamic warning demonstration component and a warning board, the dynamic warning demonstration component realizes the comparison between wearing and not wearing the safety helmet body by the first demonstration rod abutting against the top of the safety helmet body of the first human model and the second demonstration rod being inserted into the groove on the top of the second human model, and intuitively and effectively achieves the effect of dynamic warning; the warning board plays a static warning effect through warning slogans, and the combination of static and dynamic greatly improves the warning effect.

[0016] 2. Since the utility model is provided with a positioning component, the rotation of the lead screw drives a pair of positioning plates to clamp and position the connecting bottom plate of the dynamic warning demonstration component, so that the dynamic warning demonstration component is installed in the warning box body, or the connecting bottom plate of the dynamic warning demonstration component is released, facilitating the disassembly of the dynamic warning demonstration component. The disassembly and assembly are convenient, and the turnover and utilization rate are high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of the warning device for wearing a safety helmet of the utility model;

[0018] Figure 2 is a perspective view of the dynamic warning demonstration component in the warning device for wearing a safety helmet of the utility model;

[0019] Figure 3 is a schematic structural view of the linkage plate, sleeve, spring, first demonstration rod and second demonstration rod in the warning device for wearing a safety helmet of the utility model;

[0020] Figure 4 is a perspective view of the positioning component in the warning device for wearing a safety helmet of the utility model;

[0021] Figure 5 is a partial structural schematic view of the warning box body in the warning device for wearing a safety helmet of the utility model.

[0022] In the figure, 1. Warning box body; 2. Support leg; 3. Dynamic warning demonstration component; 301. Connecting bottom plate; 302. First human model; 303. Second human model; 304. Safety helmet body; 305. Groove; 306. Inverted U-shaped bracket; 307. Reciprocating telescopic rod; 308. Linkage plate; 309. Sleeve; 310. Spring; 311. First demonstration rod; 312. Second demonstration rod; 313. Limit post; 4. Limit stop block; 5. Through hole; 6. Positioning component; 601. Strip-shaped plate; 602. Lead screw; 603. Positioning plate; 7. Warning plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following further illustrates the utility model with reference to the drawings and specific embodiments.

[0024] Please refer to the attached Figure 1, A warning device for wearing a safety helmet, comprising a warning box body 1, support legs 2, a dynamic warning demonstration component 3, a positioning component 6 and a warning board 7; the warning box body 1 is a hollow box body structure with an open front end, and several support legs 2 are respectively fixedly installed at the bottom of the warning box body 1, so that the warning box body 1 is erected above the ground through several support legs 2; the dynamic warning demonstration component 3 is detachably arranged in the warning box body 1, the positioning component 6 is movably arranged at the bottom of the warning box body 1, and the positioning component 6 penetrates through the bottom plate of the warning box body 1 and is clamped on both sides of the bottom of the dynamic warning demonstration component 3; the warning board 7 is fixedly installed on the top of the warning box body 1, and a warning slogan is provided on the warning board 7.

[0025] The warning box body 1 can be made of a hard box body such as plastic or metal, and is used to install the dynamic warning demonstration component 3. The size of the warning box body 1 can be adaptively made according to the volume of the dynamic warning demonstration component 3 and the space required for operation. An opening can be provided at the front end / rear end of the warning box body 1 to facilitate the effective dynamic demonstration of the dynamic warning demonstration component 3.

[0026] The positioning component 6 facilitates the installation and positioning of the dynamic warning demonstration component 3 in the warning box body 1, is convenient to disassemble, and can improve the turnover rate of the dynamic warning demonstration component 3. The support legs 2 can be evenly distributed in four, and the height can be adaptively selected according to the actual erection height requirement of the dynamic warning demonstration component 3 to ensure the warning effect of the dynamic warning demonstration component 3.

[0027] The dynamic warning demonstration component 3 can attract the attention of passing operators more through dynamic demonstrations, and the dynamic demonstrations have more intuitive warnings, thereby improving the warning effect. At the same time, combined with the warning slogan on the warning board 7, the warning effect can be further improved. Preferably, the warning board 7 can adopt an LED screen to ensure the warning effect in case of poor light.

[0028] Please refer to Appendix Figure 2 and Appendix Figure 3 , The dynamic warning demonstration component 3 mentioned above includes a connecting bottom plate 301, a first human model 302, a second human model 303, a safety helmet body 304, a first demonstration rod 311 and a second demonstration rod 312; the connecting bottom plate 301 is clamped on the inner bottom plate of the warning box body 1 through the positioning component 6, the first human model 302 and the second human model 303 are respectively fixedly arranged on the connecting bottom plate 301, the safety helmet body 304 is worn on the top of the head of the first human model 302, and a groove 305 is formed on the top of the head of the second human model 303; the first demonstration rod 311 and the second demonstration rod 312 are vertically movable on the inner top plate of the warning box body 1, so that the lower end of the first demonstration rod 311 can abut against the top of the safety helmet body 304, and the lower end of the second demonstration rod 312 can be inserted into the groove 305.

[0029] The liftable first demonstration rod 311 and second demonstration rod 312 are used to simulate falling objects from a height. The first human model 302 and second human model 303 are used to simulate operators. The first human model 302 wearing the safety helmet body 304 will not be injured by the first demonstration rod 311 falling from a height. However, due to the setting of the groove 305, the lower end of the second demonstration rod 312 will be inserted into the head of the second human model 303. Thus, a comparison is formed between the first human model 302 and the second human model 303 with and without the safety helmet body 304, dynamically and cyclically demonstrating the hazards of not wearing the safety helmet body 304 and achieving an intuitive and effective warning effect.

[0030] The connecting bottom plate 301 is used to cooperate with the positioning component 6 to realize the positioning and installation of the dynamic warning demonstration component 3 in the warning box body 1.

[0031] Please refer to the appendix Figure 2 and the appendix Figure 3 As shown, an inverted U-shaped bracket 306 is installed on the connecting bottom plate 301. The reciprocating telescopic rod 307 is installed at the top of the inverted U-shaped bracket 306. The telescopic end of the reciprocating telescopic rod 307 penetrates through the top rod of the inverted U-shaped bracket 306 and is connected to the linkage plate 308. The upper ends of the first demonstration rod 311 and the second demonstration rod 312 are respectively installed at both ends of the linkage plate 308, so that the lower end of the first demonstration rod 311 is arranged to be liftable facing the safety helmet body 304, and the lower end of the second demonstration rod 312 is arranged to be liftable facing the groove 305.

[0032] Preferably, the reciprocating telescopic rod 307 can adopt a pneumatic or hydraulic piston rod in the prior art, and uses the piston end to achieve reciprocating telescoping, thereby realizing the reciprocating lifting function of the linkage plate 308, and further realizing the reciprocating movement of the lower end of the first demonstration rod 311 to abut downward or disengage upward from the safety helmet body 304 and the lower end of the second demonstration rod 312 to insert downward into the groove 305 or disengage upward from the groove 305.

[0033] The inverted U-shaped bracket 306 is used for the installation of the reciprocating telescopic rod 307, and the height of the reciprocating telescopic rod 307 can be adaptively made according to the lifting height requirements of the first demonstration rod 311 and the second demonstration rod 312.

[0034] Please refer to the appendix Figure 2 As shown, a pair of limit columns 313 are installed on the connecting bottom plate 301, and the pair of limit columns 313 are respectively located inside the two side rods of the inverted U-shaped bracket 306. Extension plates are respectively formed at both ends of the linkage plate 308, and the two extension plates are respectively slidably sleeved on the pair of limit columns 313 through collar rings.

[0035] Through the arrangement of a pair of limit posts 313 and the collars on the extension plate, the collars can slide up or down along the limit posts 313. The limit posts 313 play a role in guiding and limiting, improving the stability of the vertical sliding of the linkage plate 308, so as to ensure the demonstration effect that the lower end of the first demonstration rod 311 abuts downward or disengages upward from the safety helmet body 304 and the lower end of the second demonstration rod 312 inserts downward or disengages upward from the groove 305.

[0036] Please refer to the appendix Figure 3 One end of the linkage plate 308 where the first demonstration rod 311 is installed is provided with a sleeve 309. A spring 310 is installed in the sleeve 309. The upper end of the first demonstration rod 311 is elastically inserted into the sleeve 309 through the spring 310.

[0037] Due to the arrangement of the spring 310, when the lower end of the first demonstration rod 311 abuts against the safety helmet body 304, the spring 310 can be compressed upward, so as to ensure that the first demonstration rod 311 will not damage the safety helmet body 304, and the second demonstration rod 312 can continue to descend and insert into the groove 305, achieving the effect of dynamic demonstration and comparison of two groups.

[0038] Please refer to the appendix Figure 5 Please refer to the appendix, on the inner walls of both sides of the warning box body 1, there are respectively provided limit blocks 4, and the limit blocks 4 can be in contact connection with the side ends of the connecting bottom plate 301.

[0039] The distance between a pair of limit blocks 4 is greater than the length of the connecting bottom plate 301, which can be used to limit the installation position of the connecting bottom plate 301, facilitate the preliminary positioning and installation of the connecting bottom plate 301, and at the same time be used to limit the sliding position of the connecting bottom plate 301, preventing the connecting bottom plate 301 from sliding unexpectedly in a large range due to external factors such as impact after being installed and positioned by the positioning component 6.

[0040] Please refer to the appendix Figure 5 Please refer to the appendix, on the bottom plate of the warning box body 1, there are provided a pair of through holes 5. The positioning component 6 includes a pair of positioning plates 603. The lower ends of the pair of positioning plates 603 are respectively movably arranged below the warning box body 1. The upper ends of the pair of positioning plates 603 respectively pass through the bottom plate of the warning box body 1 through the pair of through holes 5 and are clamped on both side ends of the connecting bottom plate 301.

[0041] The pair of positioning plates 603 of the positioning component 6 pass through the bottom plate of the warning box body 1 upward through the pair of through holes 5, so as to be clamped on both side ends of the connecting bottom plate 301, playing a role in positioning and limiting the connecting bottom plate 301, and ensuring the installation and use stability of the connecting bottom plate 301.

[0042] Please refer to the appendix Figure 4, the positioning component 6 further includes a strip plate 601 and a lead screw 602; the strip plate 601 is fixedly arranged on the bottom surface of the bottom plate of the warning box body 1, the strip plate 601 is a hollow strip-shaped frame with an open bottom, the lead screw 602 is rotatably installed in the strip plate 601 through a rotating bearing, and one end of the lead screw 602 extends to the outside of the strip plate 601 and is externally connected to a rotating mechanism; the positioning plate 603 is in an L-shaped structure, and one ends of the horizontal sections of a pair of positioning plates 603 are respectively threadedly and movably screwed onto the lead screw 602, and the upper ends of the vertical sections of the pair of positioning plates 603 respectively extend to the outer sides of both sides of the strip plate 601 and are clamped and connected to both ends of the connecting bottom plate 301 after passing through the bottom plate of the warning box body 1 through a pair of through holes 5.

[0043] Preferably, one end of the lead screw 602 can be externally connected to a rotating mechanism such as a motor or a handle for electrically or manually controlling the rotation of the lead screw 602. Two sections of threads with opposite directions can be arranged on the lead screw 602, and threaded holes can be opened at one ends of the horizontal sections of a pair of positioning plates 603, so that by using the transmission of the threads, when the lead screw 602 rotates forward or backward, it can drive the pair of positioning plates 603 to approach or move away from each other.

[0044] Since a pair of positioning plates 603 are restricted by the through holes 5 and cannot rotate, it is ensured that the pair of positioning plates 603 move linearly along the through holes 5 and approach or move away from both ends of the connecting bottom plate 301, thereby playing a role in clamping and positioning or releasing the connecting bottom plate 301.

[0045] Please refer to Appendix Figure 1 to Appendix Figure 5 , the usage method and working principle of the present utility model are as follows:

[0046] The warning box body 1 is arranged at the entrance of the construction or production site through the support legs 2, and the dynamic warning demonstration component 3 is arranged facing the entrance through the front opening of the warning box body 1. The warning slogans on the warning board 7 and the dynamic warning of the dynamic warning demonstration component 3 are used to remind the operators to wear safety helmets when entering the site.

[0047] The dynamic warning demonstration component 3 is installed in the warning box body 1. The rotation of the lead screw 602 can be controlled by a handle or a motor, and a pair of positioning plates 603 are driven to approach each other, so that the upper ends of the pair of positioning plates 603 pass through the through holes 5 and are clamped on both ends of the connecting bottom plate 301, so that the dynamic warning demonstration component 3 is stably arranged in the warning box body 1. The limiting blocks 4 can further play a limiting role on both ends of the connecting bottom plate 301 to prevent the connecting bottom plate 301 from having a large sliding offset.

[0048] The dynamic demonstration process of the dynamic warning demonstration component 3 is as follows: The reciprocating telescopic rod 307 is extended downward through hydraulic control, so that the linkage plate 308, the sleeve 309, the spring 310, the first demonstration rod 311 and the second demonstration rod 312 move downward synchronously, and the lower end of the first demonstration rod 311 abuts against the top of the safety helmet body 304, and the lower end of the second demonstration rod 312 is inserted into the groove 305 on the top of the head of the second human model 303. Due to the setting of the spring 310, when the first demonstration rod 311 abuts against the safety helmet body 304, the spring 310 is compressed, and the first demonstration rod 311 will not insert into or damage the safety helmet body 304. By forming a dynamic contrast between the first human model 302 wearing the safety helmet body 304 and the second human model 303 with an object falling into the head, the danger of not wearing a safety helmet can be intuitively and effectively demonstrated, achieving the effect of dynamic warning.

[0049] The reciprocating telescopic rod 307 is extended upward through hydraulic control, so that the linkage plate 308, the sleeve 309, the spring 310, the first demonstration rod 311 and the second demonstration rod 312 move upward synchronously, and the lower end of the first demonstration rod 311 is separated from the safety helmet body 304, and the lower end of the second demonstration rod 312 is separated from the groove 305 on the top of the head of the second human model 303. With the reciprocating up and down movement of the reciprocating telescopic rod 307, the dynamic warning demonstration component 3 demonstrates dynamically in a cycle.

[0050] After the dynamic warning demonstration component 3 is used up, the lead screw 602 can be rotated reversely to move a pair of positioning plates 603 away from the connecting bottom plate 301, and then the dynamic warning demonstration component 3 can be taken out, and the dynamic warning demonstration component 3 can be used cyclically.

[0051] The above is only the preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A warning device for wearing a helmet, characterized by: The device comprises a warning box (1), supporting legs (2), a dynamic warning demonstration component (3), a positioning component (6) and a warning plate (7); the warning box (1) is a hollow box structure with an opening at the front end; a plurality of supporting legs (2) are respectively fixedly mounted on the bottom of the warning box (1), so that the warning box (1) is elevated above the ground by the plurality of supporting legs (2); the dynamic warning demonstration component (3) is detachably arranged in the warning box (1); the positioning component (6) is movably arranged at the bottom of the warning box (1), and the positioning component (6) passes through the bottom plate of the warning box (1) and is clamped on both sides of the bottom of the dynamic warning demonstration component (3); the warning plate (7) is fixedly mounted on the top of the warning box (1), and a warning slogan is arranged on the warning plate (7).

2. The helmet wearing warning device according to claim 1, characterized in that: The dynamic warning demonstration component (3) comprises a connecting bottom plate (301), a first character model (302), a second character model (303), a helmet body (304), a first demonstration rod (311) and a second demonstration rod (312); the connecting bottom plate (301) is clamped and arranged on the inner bottom plate of the warning box (1) through a positioning component (6); the first character model (302) and the second character model (303) are respectively fixedly arranged on the connecting bottom plate (301); the top of the first character model (302) is wearing the helmet body (304); the top of the second character model (303) is formed with a groove (305); the first demonstration rod (311) and the second demonstration rod (312) are liftably arranged on the inner top plate of the warning box (1), so that the lower end of the first demonstration rod (311) can abut against the top of the helmet body (304), and the lower end of the second demonstration rod (312) can be inserted into the groove (305).

3. The helmet wearing warning device according to claim 2, characterized in that: An inverted U-shaped bracket (306) is installed on the connecting bottom plate (301), a reciprocating telescopic rod (307) is installed on the top of the inverted U-shaped bracket (306), and the telescopic end of the reciprocating telescopic rod (307) passes through the top rod of the inverted U-shaped bracket (306) and is connected to the linkage plate (308); the upper end of the first demonstration rod (311) and the upper end of the second demonstration rod (312) are respectively installed at the two ends of the linkage plate (308), so that the lower end of the first demonstration rod (311) is arranged to face the helmet body (304) and can be lifted, and the lower end of the second demonstration rod (312) is arranged to face the groove (305) and can be lifted.

4. The helmet wearing warning device according to claim 3 is characterized in that: A pair of limiting columns (313) are installed on the connecting bottom plate (301), and the pair of limiting columns (313) are respectively located on the inner sides of the two side rods of the inverted U-shaped bracket (306); extension plates are respectively formed at both ends of the linkage plate (308), and the two extension plates are respectively slidably sleeved on the pair of limiting columns (313) through sleeve rings.

5. The helmet wearing warning device according to claim 3 is characterized in that: One end of the linkage plate (308) on which the first demonstration rod (311) is mounted is provided with a sleeve (309), a spring (310) is installed in the sleeve (309), and the upper end of the first demonstration rod (311) can be elastically inserted into the sleeve (309) through the spring (310).

6. The helmet wearing warning device according to claim 2, characterized in that: Position limiting blocks (4) are respectively provided on the inner walls on both sides of the warning box body (1), and the position limiting blocks (4) can be connected to and abut against the side ends of the connecting bottom plate (301).

7. The helmet wearing warning device according to claim 1, characterized in that: A pair of through holes (5) are provided on the bottom plate of the warning box (1), and the positioning assembly (6) includes a pair of positioning plates (603), the lower ends of the pair of positioning plates (603) are movably arranged below the warning box (1), and the upper ends of the pair of positioning plates (603) pass through the bottom plate of the warning box (1) through the pair of through holes (5) and are clamped and connected to the two side ends of the connecting bottom plate (301).

8. The helmet wearing warning device according to claim 7, characterized in that: The positioning assembly (6) further comprises a strip plate (601) and a screw rod (602); the strip plate (601) is fixedly arranged on the bottom surface of the bottom plate of the warning box body (1); the strip plate (601) is a hollow strip frame with an opening at the bottom; the screw rod (602) is rotatably embedded in the strip plate (601); one end of the screw rod (602) extends to the outside of the strip plate (601) and is externally connected to a rotating mechanism; the positioning plate (603) is in an L-shaped structure; one end of the horizontal sections of a pair of positioning plates (603) are respectively threadedly movably screwed onto the screw rod (602); the upper ends of the vertical sections of the pair of positioning plates (603) respectively extend to the outer sides of the strip plate (601) and penetrate the bottom plate of the warning box body (1) through a pair of through holes (5) and are clamped and connected to the two side ends of the connecting bottom plate (301).

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