Pressure relief device of power distribution cabinet
By designing guide notches, support frames and reset components in the distribution cabinet, multiple use and automatic reset of pressure relief components are achieved, and the problem of inconvenient pressure relief in the prior art is solved, which improves the problem of pressure relief in multiple use and reset. The use stability of the distribution cabinet.
Patent Information
- Application Number
- CN202420989660.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The existing distribution cabinet pressure relief devices have simple methods. Most of them use disposable pressure relief plates, which are inconvenient for multiple use and are inconvenient for resetting after the pressure disappears, resulting in a reduced stability of use.
A distribution cabinet pressure relief device is designed, including a guide notch, a support frame, a pressure relief assembly and a reset assembly. Through the guide notch, the pressure relief assembly is guided to the support frame, the support frame is fixed and the pressure relief assembly is rotated by the rotation of the pressure relief assembly. Drive the reset assembly for resetting, and use the reset spring to achieve multiple use and reset of the pressure relief plate.
It improves the use stability and pressure relief efficiency of the pressure relief assembly, allows the pressure relief assembly to be used multiple times, and automatically resets after the pressure disappears, enhancing the use stability of the distribution cabinet.
Smart Images
Figure CN222261942U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pressure relief of power distribution cabinets, in particular to a pressure relief device for a power distribution cabinet. Background Art
[0002] A distribution cabinet is a device used to distribute electricity. It is usually installed inside buildings, factories or other facilities. It is mainly used to receive electrical energy from the power system and then distribute it to different circuits or equipment.
[0003] At present, a Chinese utility model with publication number: CN212726246U discloses a pressure relief device for a high-voltage distribution cabinet, including a cabinet body and a pressure relief plate, a pressure relief port is provided on the top surface of the cabinet body, and the pressure relief plate is located on the top surface of the cabinet body and covers the pressure relief port, one side of the pressure relief plate is connected to the cabinet body by a nylon bolt, and the other side of the pressure relief plate opposite to the cabinet body is also connected to the cabinet body by a hinge, a mounting hole slightly larger than the nylon bolt is provided on the pressure relief plate at the position of the nylon bolt, a soft pad arranged on the surface of the pressure relief plate is provided on the upper part of the mounting hole, the soft pad covers the upper part of the mounting hole, and the nylon bolt passes through the soft pad and the mounting hole and is connected to the cabinet body; this utility model improves and optimizes the pressure relief device so that the pressure relief device can be used repeatedly, with fewer pressure relief failures, simple maintenance, low use cost, reduced operating cost increase caused by hardware damage and secondary failures, and effectively reduced user operating costs.
[0004] When it is necessary to relieve the pressure generated inside the distribution cabinet, a pressure relief device will be used, and the distribution cabinet pressure relief device is one of them. However, the pressure relief method of the existing pressure relief device is relatively simple, and most distribution cabinets use disposable pressure relief plates for pressure relief, which is not convenient for multiple use, thereby reducing the pressure relief efficiency, and most pressure relief devices are not convenient for resetting after the pressure disappears, which leads to a decrease in the subsequent use stability of the distribution cabinet. Utility Model Content
[0005] The utility model provides a pressure relief device for a distribution cabinet, aiming to solve the problem that the pressure relief method of the existing pressure relief device is relatively simple, and most distribution cabinets use disposable pressure relief plates for pressure relief, which is not convenient for multiple uses, thereby reducing the pressure relief efficiency, and most pressure relief devices are not convenient for resetting after the pressure disappears, which leads to reduced stability in subsequent use of the distribution cabinet.
[0006] The utility model is implemented as follows: a pressure relief device for a power distribution cabinet comprises a power distribution cabinet body, a guide notch is provided on the top of the power distribution cabinet body, a support frame is provided on the top of the guide notch, and the guide notch passes through the bottom of the support frame and extends to the inner wall of the support frame, the bottom of the support frame is fixedly connected to the top of the power distribution cabinet body, a pressure relief component is fixedly connected to the top of the support frame, and a reset component is fixedly connected to the bottom of the pressure relief component;
[0007] The pressure relief assembly includes a sealing plate, the bottom of which is fixedly connected to the top of the supporting frame, a pressure relief groove is provided on the top of the sealing plate, a pressure relief plate is provided on the top of the pressure relief groove, a T-shaped connecting block is fixedly connected to the top of the pressure relief plate, the front and rear sides of the other end of the T-shaped connecting block are rotatably connected to a U-shaped positioning block, and the bottom of the U-shaped positioning block is fixedly connected to the top of the sealing plate.
[0008] In order to achieve the effect of resetting the pressure relief plate, as a preferred pressure relief device of a distribution cabinet of the utility model, the reset component includes a U-shaped matching block, the top of the U-shaped matching block is fixedly connected to the bottom of the sealing plate, the side opposite to the inner wall of the U-shaped matching block is rotatably connected to the first T-shaped rod, the inner wall of the other end of the first T-shaped rod is slidably connected to the second T-shaped rod, the surface of the first T-shaped rod is provided with a limiting sliding groove, the inner wall of the limiting sliding groove is slidably connected to the limiting slider, and the inner wall of the limiting slider is slidably connected to the surface of the first T-shaped rod, the inner wall of the limiting slider is fixedly connected to the surface of the second T-shaped rod, the left side of the limiting slider is fixedly connected to a reset spring, the inner wall of the reset spring is sleeved with the surface of the first T-shaped rod, the other end of the reset spring is fixedly connected to a ring, the inner wall of the ring is fixedly connected to the surface of the other end of the first T-shaped rod, the front and rear sides of the other end of the second T-shaped rod are rotatably connected to an auxiliary block, and the top of the auxiliary block is fixedly connected to the bottom of the pressure relief plate.
[0009] In order to support the distribution cabinet body, as a preferred distribution cabinet pressure relief device of the utility model, a support block is fixedly connected to the bottom of the distribution cabinet body, and there are four support blocks in total, which are evenly distributed on the left and right sides of the bottom of the distribution cabinet body.
[0010] In order to guide the installation position of the reinforcement bolts and reinforce the supporting frame, as a preferred pressure relief device for a distribution cabinet of the utility model, a threaded hole is opened on the top of the distribution cabinet body, and the threaded hole passes through the top of the distribution cabinet body and the bottom of the supporting frame, and extends to the top of the supporting frame, and the inner wall of the threaded hole is threadedly connected with a reinforcement bolt.
[0011] In order to reinforce the sealing plate, as a preferred pressure relief device for a power distribution cabinet of the utility model, a reinforcement block is fixedly connected to the top of the support frame, the reinforcement block is set to be square, and the top of the reinforcement block is fixedly connected to the bottom of the sealing plate.
[0012] In order to achieve the effect of protecting the pressure relief plate, as a preferred pressure relief device for a power distribution cabinet of the utility model, a protective pad is fixedly connected to the bottom of the pressure relief plate, and a surface of the protective pad is provided with a plurality of protrusions used in conjunction with the protective pad.
[0013] In order to increase the rotation stability of the distribution cabinet body when it is opened, as a preferred distribution cabinet pressure relief device of the utility model, the left side of the distribution cabinet body is fixedly connected with a damping hinge used in conjunction with it, and there are two damping hinges in total.
[0014] In order to protect the user, as a preferred pressure relief device for a power distribution cabinet of the utility model, a protective sleeve is fixedly connected to the front side of the power distribution cabinet body, and the protective sleeve is made of insulating rubber material.
[0015] In order to guide the sliding direction of the second T-shaped rod, as a preferred distribution cabinet pressure relief device of the utility model, a guide hole is opened at the other end of the first T-shaped rod, the inner wall of the guide hole is slidably connected to the surface of the second T-shaped rod, and the inner wall of the guide hole is connected to the inner wall of the limiting slide groove.
[0016] In order to achieve the protective effect of the reinforcement bolts, as a preferred distribution cabinet pressure relief device of the utility model, the surface of the reinforcement bolts is clamped with a protective cover, and four protective covers are provided, and the bottom of the protective cover is in contact with the top of the support frame.
[0017] Compared with the prior art, the beneficial effects of the utility model are:
[0018] The pressure relief device of the power distribution cabinet, by providing a power distribution cabinet body, a guide slot, a support frame, a pressure relief component and a reset component, can be connected with the power distribution cabinet body through the guide slot, so that the guide slot can guide the pressure generated by the power distribution cabinet body to the support frame, and the support frame can be arranged so that the support frame can fix the pressure relief component, thereby improving the use stability of the pressure relief component, and the pressure in the support frame can lift the pressure relief component by transmitting the pressure by the support frame, and the pressure relief component can be arranged so that the pressure relief component can be rotated by pressure, and after the pressure relief component is rotated, the pressure inside the power distribution cabinet body can be relieved, and the rotation of the pressure relief component can drive the reset component to be pulled, thereby avoiding the pressure relief component from being separated from the power distribution cabinet body, and the reset component can be arranged so that after the reset component is pulled, the pressure relief component can be reset by its own rebound performance, thereby facilitating multiple uses of the pressure relief component. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is the overall structural diagram of the pressure relief device of the power distribution cabinet of the utility model;
[0020] Figure 2 This is a schematic diagram of the connection between the power distribution cabinet body and the guide notch in the utility model;
[0021] Figure 3 This is a schematic diagram of the connection between the support frame and the reinforcement block in the utility model;
[0022] Figure 4 It is a bottom view of the pressure relief assembly in the utility model;
[0023] Figure 5 It is a structural schematic diagram of the pressure relief component in the utility model;
[0024] Figure 6 It is a structural schematic diagram of the reset component in the utility model;
[0025] Figure 7 For this utility model Figure 6 Enlarged view of point A in .
[0026] In the figure, 1. distribution cabinet body; 2. guide slot; 3. support frame; 4. pressure relief assembly; 401. sealing plate; 402. pressure relief slot; 403. pressure relief plate; 404. T-shaped connecting block; 405. U-shaped positioning block; 5. reset assembly; 501. U-shaped matching block; 502. first T-shaped rod; 503. second T-shaped rod; 504. limiting slide groove; 505. limiting slider; 506. reset spring; 507. collar; 508. auxiliary block; 6. support block; 7. threaded hole; 8. reinforcement bolt; 9. reinforcement block; 10. protective pad; 11. damping hinge; 12. protective cover; 13. guide hole; 14. protective cover. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0028] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.
[0029] See also Figure 1-7 The utility model provides a technical solution: a pressure relief device for a power distribution cabinet, comprising a power distribution cabinet body 1, a guide slot 2 is provided on the top of the power distribution cabinet body 1, a support frame 3 is provided on the top of the guide slot 2, and the guide slot 2 passes through the bottom of the support frame 3 and extends to the inner wall of the support frame 3, the bottom of the support frame 3 is fixedly connected to the top of the power distribution cabinet body 1, a pressure relief component 4 is fixedly connected to the top of the support frame 3, and a reset component 5 is fixedly connected to the bottom of the pressure relief component 4;
[0030] The pressure relief assembly 4 includes a sealing plate 401, the bottom of which is fixedly connected to the top of the supporting frame 3, a pressure relief groove 402 is provided at the top of the sealing plate 401, a pressure relief plate 403 is provided at the top of the pressure relief groove 402, a T-shaped connecting block 404 is fixedly connected to the top of the pressure relief plate 403, the front and rear sides of the other end of the T-shaped connecting block 404 are rotatably connected to a U-shaped positioning block 405, and the bottom of the U-shaped positioning block 405 is fixedly connected to the top of the sealing plate 401.
[0031] In this embodiment: by setting the distribution cabinet body 1, the guide slot 2, the support frame 3, the pressure relief component 4 and the reset component 5, the guide slot 2 can be connected with the distribution cabinet body 1, so that the guide slot 2 can guide the pressure generated by the distribution cabinet body 1 to the support frame 3, and the support frame 3 can be set to fix the pressure relief component 4, thereby improving the use stability of the pressure relief component 4, and the pressure transmission by the support frame 3 can make the pressure in the support frame 3 lift the pressure relief component 4, and the pressure relief component 4 can be set to rotate by pressure, and after the pressure relief component 4 is rotated, the pressure inside the distribution cabinet body 1 can be relieved, and the rotation of the pressure relief component 4 can drive the reset component 5 to be pulled, thereby avoiding the pressure relief component 4 from being separated from the distribution cabinet body 1, and the reset component 5 can be set to reset the pressure relief component 4 by its own rebound performance after the reset component 5 is pulled, thereby facilitating the multiple use of the pressure relief component 4.
[0032] As a technical optimization solution of the utility model, the reset component 5 includes a U-shaped matching block 501, the top of the U-shaped matching block 501 is fixedly connected to the bottom of the sealing plate 401, the side opposite to the inner wall of the U-shaped matching block 501 is rotatably connected to the first T-shaped rod 502, the inner wall of the other end of the first T-shaped rod 502 is slidably connected to the second T-shaped rod 503, the surface of the first T-shaped rod 502 is provided with a limited sliding groove 504, the inner wall of the limited sliding groove 504 is slidably connected to the limited sliding block 505, and the inner wall of the limited sliding block 505 is slidably connected to the surface of the first T-shaped rod 502. The inner wall of the limit slider 505 is fixedly connected to the surface of the second T-shaped rod 503, and the left side of the limit slider 505 is fixedly connected with a return spring 506. The inner wall of the return spring 506 is sleeved with the surface of the first T-shaped rod 502. The other end of the return spring 506 is fixedly connected with a ring 507. The inner wall of the ring 507 is fixedly connected to the surface of the other end of the first T-shaped rod 502. The front and rear sides of the other end of the second T-shaped rod 503 are rotatably connected with an auxiliary block 508, and the top of the auxiliary block 508 is fixedly connected to the bottom of the pressure relief plate 403.
[0033] In this embodiment: by setting up the reset component 5, the auxiliary block 508 can be driven to move through the driving of the pressure relief plate 403, and during the movement, the second T-shaped rod 503 rotates in the auxiliary block 508, the first T-shaped rod 502 rotates in the U-shaped matching block 501, and the second T-shaped rod 503 moves outward in the first T-shaped rod 502, and then under the movement of the second T-shaped rod 503, the limiting slider 505 can be driven to move in the limiting slide groove 504, and when the limiting slider 505 moves, the reset spring 506 is squeezed through the cooperation with the ring 507, and then when the pressure is reduced, the pressure relief plate 403 can be reset by the rebound force of the reset spring 506.
[0034] As a technical optimization solution of the utility model, a support block 6 is fixedly connected to the bottom of the distribution cabinet body 1. There are four support blocks 6 in total and they are evenly distributed on the left and right sides of the bottom of the distribution cabinet body 1.
[0035] In this embodiment, by providing the support block 6 , the support block 6 can be provided so that the support block 6 can support the power distribution cabinet body 1 .
[0036] As a technical optimization solution of the utility model, a threaded hole 7 is opened on the top of the distribution cabinet body 1, and the threaded hole 7 passes through the top of the distribution cabinet body 1 and the bottom of the support frame 3, and extends to the top of the support frame 3. The inner wall of the threaded hole 7 is threadedly connected with a reinforcement bolt 8.
[0037] In this embodiment: by setting the threaded hole 7 and the reinforcing bolt 8, the threaded hole 7 can guide the installation position of the reinforcing bolt 8 through the setting of the threaded hole 7 and the reinforcing bolt 8, and by rotating the reinforcing bolt 8, the reinforcing bolt 8 after being rotated into the threaded hole 7 can reinforce the support frame 3, thereby improving the use stability of the support frame 3.
[0038] As a technical optimization solution of the present invention, a reinforcing block 9 is fixedly connected to the top of the support frame 3 . The reinforcing block 9 is set to be square, and the top of the reinforcing block 9 is fixedly connected to the bottom of the sealing plate 401 .
[0039] In this embodiment, by providing the reinforcing block 9 , the reinforcing block 9 can be used to reinforce the sealing plate 401 through the supporting frame 3 , thereby increasing the use stability of the sealing plate 401 .
[0040] As a technical optimization solution of the utility model, a protective pad 10 is fixedly connected to the bottom of the pressure relief plate 403, and a surface of the protective pad 10 is provided with a plurality of protrusions used in conjunction with the protective pad 10.
[0041] In this embodiment, by providing the protection pad 10 , the protection pad 10 can protect the pressure relief plate 403 , thereby preventing the pressure relief plate 403 and the sealing plate 401 from being worn after being reset.
[0042] As a technical optimization solution of the utility model, a damping hinge 11 used in conjunction with the power distribution cabinet body 1 is fixedly connected to the left side thereof, and two damping hinges 11 are provided in total.
[0043] In this embodiment, by providing the damping hinge 11, the damping hinge 11 can increase the stability of the rotation of the power distribution cabinet body 1 when it is opened.
[0044] As a technical optimization solution of the utility model, a protective sleeve 12 is fixedly connected to the front side of the power distribution cabinet body 1, and the protective sleeve 12 is made of insulating rubber material.
[0045] In this embodiment, the protective cover 12 is provided so that the protective cover 12 can protect the user and avoid causing harm to the user when the power distribution cabinet body 1 is opened or closed.
[0046] As a technical optimization solution of the utility model, a guide hole 13 is opened at the other end of the first T-shaped rod 502, the inner wall of the guide hole 13 is slidably connected to the surface of the second T-shaped rod 503, and the inner wall of the guide hole 13 is connected to the inner wall of the limiting slide groove 504.
[0047] In this embodiment, by providing the guide hole 13 , the guide hole 13 can guide the sliding direction of the second T-shaped rod 503 , thereby preventing the sliding position of the second T-shaped rod 503 from being offset.
[0048] As a technical optimization solution of the present invention, a protective cover 14 is clamped on the surface of the reinforcing bolt 8 . There are four protective covers 14 in total, and the bottom of the protective cover 14 is in contact with the top of the supporting frame 3 .
[0049] In this embodiment, the protective cover 14 is provided so that the protective cover 14 can protect the reinforcing bolts 8 and prevent the reinforcing bolts 8 from being corroded.
[0050] Working principle: First, when impact pressure is generated inside the distribution cabinet body 1, the impact pressure can be guided to the support frame 3 through the guide slot 2, and then the impact pressure will lift the pressure relief plate 403 from the sealing plate 401. When the pressure relief plate 403 is lifted up, it can be rotated to one side through the rotation connection between the T-shaped connecting block 404 and the U-shaped positioning block 405, so that the pressure relief plate 403 will not be deformed or damaged. When the pressure relief plate 403 rotates, it can drive the auxiliary block 508 to move, and when moving, the second T-shaped The rod 503 rotates in the auxiliary block 508, the first T-shaped rod 502 rotates in the U-shaped matching block 501, and the second T-shaped rod 503 moves outward in the first T-shaped rod 502, and then the movement of the second T-shaped rod 503 can drive the limiting slider 505 to move in the limiting slide groove 504, and when the limiting slider 505 moves, the reset spring 506 is squeezed by cooperating with the ring 507, and then when the impact pressure is reduced, the pressure relief plate 403 can be reset by the rebound force of the reset spring 506.
[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A pressure relief device for a power distribution cabinet, comprising a power distribution cabinet body (1), characterized in that: A guide slot (2) is provided at the top of the power distribution cabinet body (1); a support frame (3) is provided at the top of the guide slot (2); the guide slot (2) passes through the bottom of the support frame (3) and extends to the inner wall of the support frame (3); the bottom of the support frame (3) is fixedly connected to the top of the power distribution cabinet body (1); a pressure relief assembly (4) is fixedly connected to the top of the support frame (3); and a reset assembly (5) is fixedly connected to the bottom of the pressure relief assembly (4); The pressure relief assembly (4) comprises a sealing plate (401), the bottom of the sealing plate (401) is fixedly connected to the top of the supporting frame (3), the top of the sealing plate (401) is provided with a pressure relief groove (402), the top of the pressure relief groove (402) is provided with a pressure relief plate (403), the top of the pressure relief plate (403) is fixedly connected to a T-shaped connecting block (404), the front and rear sides of the other end of the T-shaped connecting block (404) are rotatably connected to a U-shaped positioning block (405), and the bottom of the U-shaped positioning block (405) is fixedly connected to the top of the sealing plate (401).
2. A pressure relief device for a power distribution cabinet according to claim 1, characterized in that: The reset assembly (5) comprises a U-shaped matching block (501), the top of the U-shaped matching block (501) is fixedly connected to the bottom of the sealing plate (401), the first T-shaped rod (502) is rotatably connected to the side opposite to the inner wall of the U-shaped matching block (501), the inner wall of the other end of the first T-shaped rod (502) is slidably connected to the second T-shaped rod (503), a limiting sliding groove (504) is provided on the surface of the first T-shaped rod (502), the inner wall of the limiting sliding groove (504) is slidably connected to a limiting sliding block (505), and the inner wall of the limiting sliding block (505) is slidably connected to the surface of the first T-shaped rod (502), and the limiting sliding block (503) is slidably connected to the surface of the first T-shaped rod (502). The inner wall of the block (505) is fixedly connected to the surface of the second T-shaped rod (503); a return spring (506) is fixedly connected to the left side of the limit slider (505); the inner wall of the return spring (506) is sleeved with the surface of the first T-shaped rod (502); the other end of the return spring (506) is fixedly connected to a collar (507); the inner wall of the collar (507) is fixedly connected to the surface of the other end of the first T-shaped rod (502); the front and rear sides of the other end of the second T-shaped rod (503) are rotatably connected to an auxiliary block (508); the top of the auxiliary block (508) is fixedly connected to the bottom of the pressure relief plate (403).
3. A pressure relief device for a power distribution cabinet according to claim 1, characterized in that: A support block (6) is fixedly connected to the bottom of the power distribution cabinet body (1); a total of four support blocks (6) are provided and are evenly distributed on the left and right sides of the bottom of the power distribution cabinet body (1).
4. A pressure relief device for a power distribution cabinet according to claim 1, characterized in that: A threaded hole (7) is provided at the top of the power distribution cabinet body (1), and the threaded hole (7) passes through the top of the power distribution cabinet body (1) and the bottom of the support frame (3), and extends to the top of the support frame (3), and the inner wall of the threaded hole (7) is threadedly connected with a reinforcing bolt (8).
5. A pressure relief device for a power distribution cabinet according to claim 1, characterized in that: A reinforcing block (9) is fixedly connected to the top of the support frame (3); the reinforcing block (9) is arranged in a square shape, and the top of the reinforcing block (9) is fixedly connected to the bottom of the sealing plate (401).
6. A pressure relief device for a power distribution cabinet according to claim 1, characterized in that: A protective pad (10) is fixedly connected to the bottom of the pressure relief plate (403), and a surface of the protective pad (10) is provided with a plurality of protrusions for use with the protective pad (10).
7. A pressure relief device for a power distribution cabinet according to claim 1, characterized in that: The left side of the power distribution cabinet body (1) is fixedly connected with a damping hinge (11) for use therewith, and there are two damping hinges (11) in total.
8. A pressure relief device for a power distribution cabinet according to claim 1, characterized in that: A protective sleeve (12) is fixedly connected to the front side of the power distribution cabinet body (1), and the protective sleeve (12) is made of insulating rubber material.
9. A pressure relief device for a power distribution cabinet according to claim 2, characterized in that: A guide hole (13) is provided at the other end of the first T-shaped rod (502), the inner wall of the guide hole (13) is slidably connected to the surface of the second T-shaped rod (503), and the inner wall of the guide hole (13) is communicated with the inner wall of the limiting sliding groove (504).
10. A pressure relief device for a power distribution cabinet according to claim 4, characterized in that: A protective cover (14) is clamped on the surface of the reinforcing bolt (8), and a total of four protective covers (14) are provided, and the bottom of the protective cover (14) is in contact with the top of the supporting frame (3).