Self-adaptive hanging support device for reinforcing aged structure of building ceiling

Abstract

The invention discloses a self-adaptive hanging and supporting device for reinforcing an aging structure of a building ceiling, and relates to the technical field of building ceiling supporting.The self-adaptive hanging and supporting device for reinforcing the aging structure of the building ceiling comprises two vertical plates, and the two vertical plates are fixedly connected with the ceiling; supporting tables are fixedly connected to the surfaces of the sides, close to each other, of the two vertical plates, two mounting plates are fixedly connected to the surfaces of the upper sides of the supporting tables, an inclined plate is rotationally connected between the two mounting plates, and a mounting sleeve is arranged on the lower side of the ceiling. A first spring can be compressed by means of rotation of an inclined plate and contraction of a connecting plate, deformation and collapse of the ceiling are avoided by means of elastic force of the first spring and upward force of the ceiling, meanwhile, when accumulated snow exists on the ceiling, the stress of the first spring is increased, the deformation amplitude is synchronously increased, and the upward force applied to the ceiling is synchronously increased; and the aim of self-adaptive adjustment is fulfilled.

Description

Technical Field

[0001] This invention relates to the field of building ceiling support technology, and in particular to an adaptive hanging support device for reinforcing the aging structure of building ceilings. Background Technology

[0002] A building roof is the covering structure at the top of the interior of a building. It has multiple functions and forms, serving purposes such as load-bearing, space division, thermal insulation, noise reduction, and decoration.

[0003] However, under long-term loads such as their own weight, wind loads, and snow loads, the structural components of the roof, such as the joists and trusses, may deform. For example, the joists may bend or sag, resulting in an uneven roof surface, which in severe cases may even affect the overall stability of the roof. At the same time, the various components of the roof are fixed and connected by connectors, which may loosen or fall off due to material fatigue, corrosion, or other reasons. Loosening of the connections will reduce the overall integrity of the roof structure and weaken the collaborative working ability between the components, making it easy to cause local damage or even overall collapse. Therefore, it is necessary to reinforce and support the building roof. In view of this, we propose an adaptive hanging support device for reinforcing the aging structure of building roofs. Summary of the Invention

[0004] The purpose of this invention is to provide an adaptive hanging support device for reinforcing the aging structure of building roofs, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adaptive hanging support device for reinforcing the aging structure of a building roof, comprising two vertical plates, a roof fixedly connected to the two vertical plates, a support platform fixedly connected to the adjacent side surface of each of the two vertical plates, two mounting plates fixedly connected to the upper surface of the support platform, an inclined plate rotatably connected between the two mounting plates, an mounting sleeve provided on the lower side of the roof, expansion grooves provided on both the left and right sides of the mounting sleeve, a connecting plate slidably connected inside the expansion grooves, the opposing side surfaces of the two connecting plates extending out of the mounting sleeve, a first spring fixedly connected to the adjacent side surface of each of the two connecting plates, a rotating groove provided on the opposing side surface of each of the two connecting plates, the upper and lower sides of the rotating groove extending out of the upper and lower side surfaces of the connecting plate, and a support assembly provided on the mounting sleeve.

[0006] Preferably, the support assembly includes a sleeve, which is fixedly connected to the upper surface of the mounting sleeve. A second spring is fixedly connected to the bottom wall of the sleeve, and a column is fixedly connected to the upper end of the second spring. The column is slidably connected to the sleeve.

[0007] Preferably, the upper end of the column extends slidably out of the upper surface of the sleeve, and a first triangular support block is fixedly connected to the upper surface of the column, the first triangular support block being in contact with the lower surface of the ceiling.

[0008] Preferably, extension plates are fixedly connected to both the front and rear surfaces of the first triangular support block, and inclined support rods are fixedly connected to both the front and rear surfaces of the first triangular support block.

[0009] Preferably, the end of the inclined support rod is fixedly connected to the extension plate, the inner wall of the rotating groove is fixedly connected to a rotating shaft, the end of the inclined plate away from the support platform is rotatably sleeved on the outer surface of the rotating shaft, and a crossbar is fixedly connected between the two support platforms.

[0010] Preferably, a reinforcing support sleeve is fixedly connected to the upper surface of the crossbar. Two reinforcing support sleeves are provided. A third spring is fixedly connected to the bottom wall of each of the two reinforcing support sleeves. A reinforcing upright is fixedly connected to the upper end of the third spring. The upper end of the reinforcing upright extends out of the upper surface of the reinforcing support sleeve. A first contact plate is fixedly connected to the upper end of the reinforcing upright.

[0011] Preferably, the first contact plate contacts the lower surface of the connecting plate, and diagonal braces are fixedly connected to the adjacent surfaces of the two reinforcing uprights. The two diagonal braces are arranged in a figure-eight shape. A second contact plate is fixedly connected to the upper end of the two diagonal braces. The upper surface of the second contact plate contacts the lower surface of the mounting sleeve. A fixing plate is fixedly connected to the lower surface of the support platform. Fixing bolts are provided on the fixing plate. The fixing plate is fixedly connected to the vertical plate by the fixing bolts. A horizontal plate is provided between the two vertical plates.

[0012] Preferably, an ear plate is fixedly connected to the lower surface of the horizontal plate, and the ear plate is also fixedly connected to the vertical plate by fixing bolts. A vertical rod is fixedly connected to the upper surface of the horizontal plate, and a second triangular support block is fixedly connected to the upper end of the vertical rod. The upper surface of the second triangular support block is in contact with the lower surface of the ceiling.

[0013] Preferably, the lower surface of the crossbar has two sliding grooves, and a displacement block is slidably connected inside each of the two sliding grooves. A connecting rod is rotatably connected to the lower surface of each of the two displacement blocks. A displacement plate is fixedly connected to one end of the two connecting rods that are close to each other. A detection rod is fixedly connected to the upper surface of the displacement plate. The upper end of the detection rod movably extends through the upper surface of the crossbar and is fixedly connected to the lower surface of the mounting sleeve. A fourth spring is fixedly connected between the inner wall of the sliding groove and the displacement block.

[0014] Preferably, a push-button is fixedly connected to the inner wall of the sliding groove, an alarm light is fixedly connected between the two displacement plates, the alarm light is electrically connected to the push-button, a fixing sleeve is fitted on the outer surface of the detection rod, and two synchronizing rods are fixedly connected to the outer surface of the fixing sleeve, with the ends of the two synchronizing rods respectively fixedly connected to two vertical rods.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The adaptive hanging support device for reinforcing the aging structure of the building's roof can compress the first spring by rotating the inclined plate and contracting the connecting plate when the roof deforms. Then, the elastic force of the first spring and the upward force of the roof can be used to prevent the roof from deforming and collapsing. At the same time, when there is snow on the roof, the force on the first spring increases and the deformation amplitude increases accordingly, so that the upward force it gives to the roof also increases accordingly, thus achieving the purpose of adaptive adjustment.

[0017] 2. The adaptive hanging support device for reinforcing the aging structure of the building's roof uses an extension plate to increase the contact area between the first triangular support block and the roof, thereby avoiding damage to the roof due to a small stress point. At the same time, the reinforced uprights can support the mounting sleeve to prevent deformation in the middle from causing the connecting plate to become immobile.

[0018] 3. The adaptive hanging support device for reinforcing the aging structure of the building's roof can connect the detection rod and the vertical rod together through the synchronous rod. At the same time, it can use the setting of push-button and alarm light to detect the deformation of the reinforcement components in real time. Once the value is exceeded, an alarm will be triggered to ensure safety. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a structural schematic diagram of an adaptive hanging support device for reinforcing the aging structure of a building roof according to the present invention;

[0021] Figure 2 This is a schematic diagram of the fixing plate of the present invention;

[0022] Figure 3 This is a schematic diagram of the support components of the present invention;

[0023] Figure 4 This is a schematic cross-sectional view of the mounting sleeve of the present invention;

[0024] Figure 5 This is a cross-sectional schematic diagram of the reinforcing support sleeve of the present invention;

[0025] Figure 6 This is a schematic cross-sectional view of the sleeve of the present invention;

[0026] Figure 7 For the present invention Figure 2 Enlarged view of point A.

[0027] Reference numerals: 1. Vertical plate; 2. Canopy; 3. Support platform; 4. Mounting plate; 5. Inclined plate; 6. Mounting sleeve; 7. Expansion groove; 8. Connecting plate; 9. First spring; 10. Rotating groove; 11. Sleeve; 12. Second spring; 13. Column; 14. First triangular support block; 15. Extension plate; 16. Diagonal support rod; 17. Rotating shaft; 18. Horizontal bar; 19. Reinforcing support sleeve; 20. Third spring; 21. 21. Reinforced upright; 22. First contact plate; 23. Diagonal brace; 24. Second contact plate; 25. Fixing plate; 26. Fixing bolt; 27. Horizontal plate; 28. Ear plate; 29. ​​Vertical rod; 30. Second triangular support block; 31. Sliding groove; 32. Displacement block; 33. Connecting rod; 34. Displacement plate; 35. Detection rod; 36. Fourth spring; 37. Press-button; 38. Alarm light; 39. Fixing sleeve; 40. Synchronizing rod. Detailed Implementation

[0028] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0029] Please see Figure 1-7This invention provides a technical solution: an adaptive hanging support device for reinforcing the aging structure of a building ceiling, comprising two vertical plates 1, a ceiling 2 fixedly connected to the two vertical plates 1, a support platform 3 fixedly connected to the adjacent side surface of each of the two vertical plates 1, two mounting plates 4 fixedly connected to the upper side surface of the support platform 3, an inclined plate 5 rotatably connected between the two mounting plates 4, an mounting sleeve 6 provided on the lower side of the ceiling 2, expansion grooves 7 provided on both the left and right sides of the mounting sleeve 6, a connecting plate 8 slidably connected inside the expansion grooves 7, the distant side surface of each of the two connecting plates 8 extending beyond the outside of the mounting sleeve 6, a first spring 9 fixedly connected to the adjacent side surface of each of the two connecting plates 8, a rotating groove 10 provided on the distant side surface of each of the two connecting plates 8, the upper and lower sides of the rotating groove 10 extending beyond the upper and lower sides of the connecting plate 8, and a mounting sleeve 6 rotatably connected to the ceiling 2. The mounting sleeve 6 is equipped with a support assembly. When the mounting sleeve 6 descends, it will simultaneously drive the two connecting plates 8 to move. When the two connecting plates 8 move, they will drive the inclined plate 5 to rotate. At the same time, the connecting plates 8 will retract into the mounting sleeve 6 to provide space for the rotation of the inclined plate 5, and the force will be transmitted to the support platform 3 for distribution through the inclined plate 5. When the connecting plates 8 move, they will simultaneously compress the first spring 9. The elastic force of the first spring 9 will give the roof 2 an upward force. When the roof 2 deforms, the rotation of the inclined plate 5 and the retraction of the connecting plates 8 can compress the first spring 9. Thus, the elastic force of the first spring 9 and the upward force of the roof 2 can be used to prevent the roof 2 from deforming and collapsing. At the same time, when there is snow on the roof 2, the force on the first spring 9 increases and the deformation amplitude increases simultaneously, so that the upward force it gives to the roof 2 will also increase simultaneously, achieving the purpose of adaptive adjustment.

[0030] Furthermore, the support assembly includes a sleeve 11, which is fixedly connected to the upper surface of the mounting sleeve 6. A second spring 12 is fixedly connected to the bottom wall of the sleeve 11, and a column 13 is fixedly connected to the upper end of the second spring 12. The column 13 is slidably connected to the sleeve 11, and the upper end of the column 13 extends slidably beyond the upper surface of the sleeve 11. A first triangular support block 14 is fixedly connected to the upper surface of the column 13, and the first triangular support block 14 contacts the lower surface of the ceiling 2. Extension plates 15 are fixedly connected to both the front and rear surfaces of the first triangular support block 14, and inclined support rods 16 are fixedly connected to both the front and rear surfaces of the first triangular support block 14. The ends of the inclined support rods 16 are fixedly connected to the extension plates 15. A rotating groove 10 is fixedly connected to the inner wall of the rotating groove 10. The rotating shaft 17 has an inclined plate 5 rotatably sleeved on its outer surface at the end furthest from the support platform 3. A crossbar 18 is fixedly connected between the two support platforms 3. A reinforcing support sleeve 19 is fixedly connected to the upper surface of the crossbar 18. Two reinforcing support sleeves 19 are provided. A third spring 20 is fixedly connected to the bottom wall of each of the two reinforcing support sleeves 19. A reinforcing upright 21 is fixedly connected to the upper end of the third spring 20. The upper end of the reinforcing upright 21 extends beyond the upper surface of the reinforcing support sleeve 19. A first contact plate 22 is fixedly connected to the upper end of the reinforcing upright 21. The first contact plate 22 contacts the lower surface of the connecting plate 8. Inclined rods 23 are fixedly connected to the adjacent surfaces of the two reinforcing uprights 21. The two inclined rods 23 are arranged in a V-shape. A second contact plate 24 is fixedly connected to the upper end of the support platform 3. The upper surface of the second contact plate 24 contacts the lower surface of the mounting sleeve 6. A fixing plate 25 is fixedly connected to the lower surface of the support platform 3. Fixing bolts 26 are provided on the fixing plate 25. The fixing plate 25 is fixedly connected to the vertical plate 1 through the fixing bolts 26. A horizontal plate 27 is provided between the two vertical plates 1. An ear plate 28 is fixedly connected to the lower surface of the horizontal plate 27. The ear plate 28 is also fixedly connected to the vertical plate 1 through the fixing bolts 26. A vertical rod 29 is fixedly connected to the upper surface of the horizontal plate 27. A second triangular support block 30 is fixedly connected to the upper end of the vertical rod 29. The upper surface of the second triangular support block 30 contacts the lower surface of the ceiling 2. Due to aging of the support structures such as the vertical rod 29 and the horizontal plate 27, the support may become unstable. If insufficient, the structure on the support platform 3 can be assembled on the ground first. By tightly attaching the upper surface of the support platform 3 to the lower surface of the ear plate 28, and then fixing the fixing plate 25 with fixing bolts 26, the support platform 3 can be fixed. If the ceiling 2 deforms at this time, this force will be transmitted to the first triangular support block 14, and the extension plate 15 will be used to increase the contact area with the ceiling 2. The force of the first triangular support block 14 and the column 13 will be transmitted to the column 13. The column 13 will move downward under the force, thereby compressing the second spring 12. At the same time, when the downward pressure exceeds the threshold of the second spring 12, the force sleeve 11 will drive the mounting sleeve 6 to descend. When the mounting sleeve 6 descends, it will also drive the first contact plate 22 and the second contact plate 24 to descend simultaneously.When the first contact plate 22 and the second contact plate 24 descend, they simultaneously drive the reinforcing pole 21 to descend as well. The descent of the reinforcing pole 21 compresses the third spring 20, thus providing an upward force to the ceiling 2 using the elastic force of the third spring 20. Simultaneously, the presence of the two diagonal braces 23 prevents deformation of the central area of ​​the mounting sleeve 6 due to stress. The extension plate 15 increases the contact area between the first triangular support block 14 and the ceiling 2, preventing damage to the ceiling 2 due to a small stress point. Furthermore, the reinforcing pole 21 supports the mounting sleeve 6, preventing deformation in its center that could prevent the connecting plate 8 from moving.

[0031] Furthermore, two sliding grooves 31 are formed on the lower surface of the crossbar 18. Displacement blocks 32 are slidably connected inside each of the two sliding grooves 31. Connecting rods 33 are rotatably connected to the lower surfaces of the two displacement blocks 32. Displacement plates 34 are fixedly connected to the adjacent ends of the two connecting rods 33. A detection rod 35 is fixedly connected to the upper surface of the displacement plate 34. The upper end of the detection rod 35 extends through the upper surface of the crossbar 18 and is fixedly connected to the lower surface of the mounting sleeve 6. A fourth spring 36 is fixedly connected between the inner wall of the sliding groove 31 and the displacement blocks 32. There is a push-button 37, and an alarm light 38 is fixedly connected between the two displacement plates 34. The alarm light 38 is electrically connected to the push-button 37. A fixing sleeve 39 is fitted on the outer surface of the detection rod 35. Two synchronizing rods 40 are fixedly connected to the outer surface of the fixing sleeve 39. The ends of the two synchronizing rods 40 are fixedly connected to the two vertical rods 29 respectively. The detection rod 35 and the vertical rods 29 can be connected together through the synchronizing rods 40. At the same time, the push-button 37 and the alarm light 38 can be used to detect the deformation of the reinforcement component in real time. Once the warning value is exceeded, an alarm will be triggered to ensure safety.

[0032] Working principle: When the supporting structures such as the vertical rod 29 and the horizontal plate 27 become insufficient due to aging, the structure on the support platform 3 can be assembled on the ground first. By tightly attaching the upper surface of the support platform 3 to the lower surface of the ear plate 28, and then fixing the fixing plate 25 with fixing bolts 26, the support platform 3 is fixed. If the ceiling 2 deforms at this time, this force will be transmitted to the first triangular support block 14, and the extension plate 15 will be used to increase the contact area with the ceiling 2. The first triangular support block 14 and the force transmission The force is delivered to the column 13, which moves downward under pressure, compressing the second spring 12. Simultaneously, when the downward pressure exceeds the threshold of the second spring 12, the force sleeve 11 will cause the mounting sleeve 6 to descend. As the mounting sleeve 6 descends, it simultaneously moves the two connecting plates 8, causing the inclined plate 5 to rotate. At the same time, the connecting plates 8 retract into the mounting sleeve 6 to provide space for the rotation of the inclined plate 5, and the force is transmitted to the support platform 3 for distribution through the inclined plate 5. Simultaneously, the movement of the connecting plates 8 compresses the first spring 9, utilizing the first spring... The elastic force of the 9 provides an upward force to the ceiling 2. Simultaneously, as the mounting sleeve 6 descends, it also drives the first contact plate 22 and the second contact plate 24 to descend. The descent of the first contact plate 22 and the second contact plate 24 simultaneously drives the reinforcing pole 21 to descend. The descent of the reinforcing pole 21 simultaneously compresses the third spring 20, thereby using the elastic force of the third spring 20 to provide an upward force to the ceiling 2. At the same time, the presence of the two diagonal braces 23 can prevent deformation of the central area of ​​the mounting sleeve 6 due to stress. If the vertical pole 29 or the mounting sleeve 6 deforms due to stress, it will cause the support... When the support is insufficient, the synchronizing rod 40 will drive the detection rod 35 to move. After the detection rod 35 moves, it will synchronously drive the displacement plate 34 to move. When the displacement plate 34 moves, it will pull the two displacement blocks 32 closer to each other. When the displacement blocks 32 move, they will compress the fourth spring 36. The fourth spring 36 can support the displacement blocks 32 during normal use. After the displacement blocks 32 move, they will contact the push button 37, which will trigger the alarm light 38 to flash, thereby reminding people that the support structure has deformed and needs maintenance and replacement.

[0033] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An adaptive hanging support device for reinforcing the aging structure of a building roof, comprising two vertical plates (1), characterized in that: A canopy (2) is fixedly connected to the two vertical plates (1). A support platform (3) is fixedly connected to the adjacent side surface of the two vertical plates (1). Two mounting plates (4) are fixedly connected to the upper side surface of the support platform (3). An inclined plate (5) is rotatably connected between the two mounting plates (4). An mounting sleeve (6) is provided on the lower side of the canopy (2). A telescopic groove (7) is provided on both the left and right sides of the mounting sleeve (6). A connecting plate (8) is slidably connected inside the telescopic groove (7). The opposite side surface of the two connecting plates (8) extends out of the mounting sleeve (6). A first spring (9) is fixedly connected to the adjacent side surface of the two connecting plates (8). A rotating groove (10) is provided on the opposite side surface of the two connecting plates (8). The upper and lower sides of the rotating groove (10) extend out of the upper and lower sides of the connecting plate (8). A support component is provided on the mounting sleeve (6).

2. The adaptive hanging support device for reinforcing the aging structure of a building roof according to claim 1, characterized in that: The support assembly includes a sleeve (11), which is fixedly connected to the upper surface of the mounting sleeve (6). A second spring (12) is fixedly connected to the bottom wall of the sleeve (11), and a column (13) is fixedly connected to the upper end of the second spring (12). The column (13) is slidably connected to the sleeve (11).

3. The adaptive hanging support device for reinforcing the aging structure of a building roof according to claim 2, characterized in that: The upper end of the column (13) extends slidably out of the upper surface of the sleeve (11), and a first triangular support block (14) is fixedly connected to the upper surface of the column (13). The first triangular support block (14) is in contact with the lower surface of the ceiling (2).

4. The adaptive hanging support device for reinforcing the aging structure of a building roof according to claim 3, characterized in that: An extension plate (15) is fixedly connected to both the front and rear surfaces of the first triangular support block (14), and an oblique support rod (16) is fixedly connected to both the front and rear surfaces of the first triangular support block (14).

5. The adaptive hanging support device for reinforcing the aging structure of a building roof according to claim 4, characterized in that: The end of the inclined support rod (16) is fixedly connected to the extension plate (15), the inner wall of the rotating groove (10) is fixedly connected to the rotating shaft (17), the end of the inclined plate (5) away from the support platform (3) is rotatably sleeved on the outer surface of the rotating shaft (17), and a crossbar (18) is fixedly connected between the two support platforms (3).

6. The adaptive hanging support device for reinforcing the aging structure of a building roof according to claim 5, characterized in that: A reinforcing support sleeve (19) is fixedly connected to the upper surface of the crossbar (18). There are two reinforcing support sleeves (19). A third spring (20) is fixedly connected to the bottom wall of each of the two reinforcing support sleeves (19). A reinforcing upright (21) is fixedly connected to the upper end of the third spring (20). The upper end of the reinforcing upright (21) extends out of the upper surface of the reinforcing support sleeve (19). A first contact plate (22) is fixedly connected to the upper end of the reinforcing upright (21).

7. The adaptive hanging support device for reinforcing the aging structure of a building roof according to claim 6, characterized in that: The first contact plate (22) contacts the lower surface of the connecting plate (8). The two reinforcing poles (21) are fixedly connected to the adjacent side surfaces with diagonal rods (23). The two diagonal rods (23) are arranged in a figure-eight shape. The upper ends of the two diagonal rods (23) are fixedly connected to the second contact plate (24). The upper surface of the second contact plate (24) contacts the lower surface of the mounting sleeve (6). The lower surface of the support platform (3) is fixedly connected to the fixing plate (25). The fixing plate (25) is provided with fixing bolts (26). The fixing plate (25) is fixedly connected to the vertical plate (1) through fixing bolts (26). A horizontal plate (27) is provided between the two vertical plates (1).

8. The adaptive hanging support device for reinforcing the aging structure of a building roof according to claim 7, characterized in that: The lower surface of the horizontal plate (27) is fixedly connected to an ear plate (28), which is also fixedly connected to the vertical plate (1) by a fixing bolt (26). The upper surface of the horizontal plate (27) is fixedly connected to a vertical rod (29), and the upper end of the vertical rod (29) is fixedly connected to a second triangular support block (30). The upper surface of the second triangular support block (30) is in contact with the lower surface of the ceiling (2).

9. The adaptive hanging support device for reinforcing the aging structure of a building roof according to claim 5, characterized in that: The lower surface of the crossbar (18) has two sliding grooves (31), and displacement blocks (32) are slidably connected inside the two sliding grooves (31). The lower surfaces of the two displacement blocks (32) are rotatably connected to connecting rods (33). The near ends of the two connecting rods (33) are fixedly connected to displacement plates (34). The upper surface of the displacement plates (34) is fixedly connected to a detection rod (35). The upper end of the detection rod (35) extends through the upper surface of the crossbar (18) and is fixedly connected to the lower surface of the mounting sleeve (6). A fourth spring (36) is fixedly connected between the inner wall of the sliding groove (31) and the displacement block (32).

10. The adaptive hanging support device for reinforcing the aging structure of a building roof according to claim 9, characterized in that: A push button (37) is fixedly connected to the inner wall of the sliding groove (31), and an alarm light (38) is fixedly connected between the two displacement plates (34). The alarm light (38) is electrically connected to the push button (37). A fixing sleeve (39) is fitted on the outer surface of the detection rod (35). Two synchronizing rods (40) are fixedly connected to the outer surface of the fixing sleeve (39). The ends of the two synchronizing rods (40) are fixedly connected to two vertical rods (29) respectively.

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