A subway construction noise reduction device and method

Abstract

The application relates to the field of building construction and discloses a subway construction noise reduction device, which comprises a sound insulation shed arranged outside a wellhead and a cover plate fixed to the upper end of the wellhead, and further comprises a fixing unit arranged outside the wellhead, wherein the fixing unit comprises a bottom plate fixed outside the wellhead, a connecting piece adjustably arranged at the upper end of the bottom plate, a fixing device arranged on the connecting piece, and a protection piece arranged on the connecting piece and connected with the fixing device. The sound insulation shed and the cover plate can form an effective sound insulation barrier at key positions such as the wellhead, the propagation of noise and vibration can be significantly reduced, the interference on the life of residents can be reduced, and 24-hour uninterrupted construction can be ensured after the wellhead noise reduction cover plate, the sound insulation and noise reduction closed sound insulation shed and the sound absorption cotton are used. The 10 hours at night can be used for construction, the construction production progress can be accelerated, and the life quality of the residents around the construction can be ensured.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a noise reduction device and method for subway construction. Background Technology

[0002] Subway construction, especially when blasting or similar operations are involved, generates significant noise and vibration. This noise and vibration not only disrupts the surrounding environment and residents' lives but can also pose a safety threat to the construction site. To mitigate these disturbances and threats, a series of noise reduction measures are typically implemented at the construction site.

[0003] Traditional noise reduction methods may include setting up sound barriers around the construction site or using noise reduction equipment to reduce noise propagation. However, these methods are often limited in effectiveness, especially during high-intensity operations such as blasting, where traditional soundproofing measures may struggle to effectively reduce the transmission of noise and vibration.

[0004] The existing equipment has the following drawbacks: In key locations such as subway shafts, frequent operations are required. The subway shafts are located very close to the surrounding residential areas. The noise generated by conventional shaft excavation and support construction, including blasting operations, seriously affects the quality of life of the residents. Noise pollution complaints are frequent. Construction is not possible from 8:00 PM to 6:00 AM the next day, which seriously affects the progress of on-site shaft excavation.

[0005] Therefore, this application proposes a noise reduction device and method for subway construction to solve the above-mentioned problems. Summary of the Invention

[0006] The purpose of this invention is to provide a noise reduction device and method for subway construction, in order to solve the problem that the noise generated by the above-mentioned blasting operations and other processes seriously affects the quality of life of residents in the community, resulting in frequent noise complaints and the inability to carry out construction from 20:00 at night to 6:00 the next morning, which seriously affects the progress of on-site shaft excavation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a noise reduction device for subway construction, comprising a soundproof canopy installed outside the manhole opening and a cover plate fixed to the upper end of the manhole opening, and further comprising:

[0008] A fixing unit is provided on the outside of the wellhead for fixing the cover plate;

[0009] The fixing unit includes:

[0010] The base plate is fixed to the outside of the wellhead;

[0011] A connector is adjustablely positioned at the upper end of the base plate;

[0012] A fixing device is provided on the connector for fixing the cover plate;

[0013] A protective component, disposed on the connector and connected to the fixing device, is used to protect the cover plate.

[0014] The connecting component includes a column threaded to the upper end of the base plate, a screw threaded to the upper end of the column, a fixing ring sleeved on the screw, a rotating frame rotatably mounted on the fixing ring, a side plate fixed to the rotating frame away from the fixing ring, and a fixing shaft fixed between the side plates. The rotating frame is connected to the fixing device through a transmission component.

[0015] The fixing device includes a first fixing plate and a second fixing plate. A lifting rod is fixed to the upper end of the second fixing plate, and a pressing rod is fixed to the upper end of the second fixing plate. Both the lifting rod and the pressing rod pass through the rotating frame. A guide rod is fixed to the upper end of the first fixing plate. The guide rod passes through the second fixing plate, and a limit block is fixed to the upper end of the guide rod.

[0016] The lifting rod and the squeezing rod are fitted with elastic elements between the second fixed plate and the rotating frame.

[0017] The transmission component includes a vertical plate fixed to the upper end of the first fixed plate and passing through the rotating frame, a first rack fixed to the vertical plate, a connecting plate fixed to the upper end of the extrusion rod, a gear rotatably disposed on the upper end of the connecting plate and meshing with the first rack, and a second rack slidably disposed on the connecting plate and meshing with the gear. A baffle is provided on the side of the second rack near the protective component, and the rotating frame has a through hole for the vertical plate to move.

[0018] The protective component includes a horizontal plate passing through the fixed shaft, an inclined plate disposed on the side of the horizontal plate away from the rotating frame and inclined thereon, and a protective rod fixed to the lower end of the inclined plate. The horizontal plate abuts against the lifting rod, and the limiting plate abuts against the upper end of the horizontal plate.

[0019] Wherein, a limiting plate is provided at the position where the second rack connects to the connecting plate, and a sliding groove is provided on the connecting plate for the limiting plate to move.

[0020] The cover plate includes a steel plate, a sound-absorbing plate fixed to the lower part of the steel plate, and a protective plate fixed to the lower end of the sound-absorbing plate. The first fixing plate is fixed to the upper end of the steel plate.

[0021] The soundproof shed includes a frame and soundproof panels disposed on the outside of the frame. A door is provided on one side of the soundproof shed, and a roof is provided at the top of the soundproof shed.

[0022] A method for noise reduction during subway construction, used to operate the aforementioned noise reduction device for subway construction, includes the following steps:

[0023] S1. Pre-embed high-strength bolts on the outside of the wellhead, install the frame of the soundproof canopy on the pre-embedded bolts, and finally install the soundproof panels on the frame to complete the installation and fixing of the soundproof canopy.

[0024] S2. When carrying out blasting work, fix the cover plate to the upper end of the wellhead, then rotate the connector to move the fixing device to the upper end of the cover plate, and then fix the fixing device to the upper end of the cover plate to complete the fixing work of the cover plate, so as to prevent the cover plate from breaking off from the upper end of the wellhead after being subjected to the impact force of the blast.

[0025] S3. When the cover plate is subjected to an impact force, it will move upward, which will then drive the first fixed plate to move upward. The first fixed plate will then drive the transmission component to move, releasing the restriction of the transmission component on the protective component. Then, when the first fixed plate drives the second fixed plate to move upward, the second fixed plate will drive the protective component to move downward and strike the cover plate, causing the cover plate to move downward. This can limit the upward movement distance of the cover plate.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] When blasting operations are carried out and the cover plate moves upward due to impact force, the fixing device can restrict the cover plate, effectively preventing it from breaking open and improving the safety of the construction site. The protective component can also strike the cover plate when it is subjected to excessive impact force, limiting its upward movement distance and further enhancing safety. By setting up a soundproof shed and cover plate, an effective sound barrier can be formed at key locations such as the wellhead, significantly reducing the transmission of noise and vibration, helping to protect the surrounding environment of the construction site and reducing interference with residents' lives. After adopting the wellhead sound-absorbing cover plate + soundproof and noise-reducing enclosed soundproof shed + sound-absorbing cotton, 24-hour uninterrupted construction can be guaranteed, with an additional 10 hours of nighttime construction available, accelerating the construction progress and ensuring the quality of life of residents around the construction site. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the main structure in one embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional structural schematic diagram of one embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the internal structure of a soundproof shed in one embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the connection between the cover plate and the wellhead in one embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the fixing unit in one embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of an exploded transmission component in one embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the fixed unit from the front view in one embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the cover plate in one embodiment of the present invention;

[0036] Figure 9 for Figure 4 Enlarged structural diagram of section A in the middle;

[0037] Figure 10 for Figure 4 Enlarged structural diagram of section B in the middle;

[0038] Figure 11 for Figure 6 Enlarged structural diagram of section C;

[0039] Figure 12 This is a schematic diagram of the connection between the base plate and the screw in one embodiment of the present invention;

[0040] Figure 13 This is a schematic diagram of the structure of a fixed unit explosion in one embodiment of the present invention.

[0041] In the diagram: 1. Soundproof shed; 101. Wellhead; 11. Door; 12. Frame; 13. Soundproof panel; 14. Roof; 2. Cover plate; 21. Steel plate; 22. Sound-absorbing panel; 23. Protective panel; 3. Fixing unit; 31. Base plate; 32. Column; 33. Connector; 331. Fixing ring; 332. Rotating frame; 3321. Perforation; 3322. Moving hole; 3323. Rotating hole; 333. Side plate; 334. Fixing shaft; 34. Screw; 35. Fixing device; 36. 1. First fixed plate; 3511. Guide rod; 3512. Limiting block; 3513. Vertical plate; 3514. First rack; 352. Second fixed plate; 3521. Lifting rod; 3522. Elastic element; 3523. Pressing rod; 3524. Connecting plate; 35241. Slide groove; 36. Transmission component; 361. Gear; 362. Second rack; 363. Limiting plate; 364. Baffle; 37. Protective component; 371. Horizontal plate; 372. Inclined plate; 373. Protective rod. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figure 1-13 The present invention provides a technical solution: a noise reduction device for subway construction, comprising a soundproof canopy 1 installed on the outside of the well opening 101 and a cover plate 2 fixed to the upper end of the well opening 101, and further comprising:

[0044] The fixing unit 3 is located on the outside of the wellhead 101 and is used to fix the cover plate 2.

[0045] Fixed unit 3 includes:

[0046] The base plate 31 is fixed to the outside of the wellhead 101;

[0047] The connector 33 is adjustablely positioned at the upper end of the base plate 31;

[0048] The fixing device 35 is mounted on the connector 33 and is used to fix the cover plate 2.

[0049] The protective component 37 is mounted on the connector 33 and connected to the fixing device 35, and is used to protect the cover plate 2.

[0050] It should be noted that during operation, the cover plate 2 is fixed to the upper end of the wellhead 101, and then the connecting piece 33 is rotated to move the fixing device 35 to the upper end of the cover plate 2. Then the fixing device 35 is fixed to the upper end of the cover plate 2. When blasting operations are carried out and the cover plate 2 is subjected to impact force and moves upward, the fixing device 35 can restrict the cover plate 2, effectively preventing the cover plate 2 from breaking open and improving the safety of the construction site. The protective piece 37 can also strike the cover plate 2 when it is subjected to excessive impact force, limiting its upward movement distance and further enhancing safety. By setting up the soundproof shed 1 and the cover plate 2, an effective soundproof barrier can be formed at key locations such as the wellhead 101, significantly reducing the transmission of noise and vibration, helping to protect the surrounding environment of the construction site and reducing interference with residents' lives. After adopting the wellhead 101 soundproof cover plate 2 + soundproof and noise-reducing sealed soundproof shed 1 + sound-absorbing cotton, 24-hour uninterrupted construction can be guaranteed, with an additional 10 hours of nighttime construction available, accelerating the construction production progress and ensuring the quality of life of residents around the construction site.

[0051] In one embodiment, the connector 33 includes a column 32 threaded to the upper end of the base plate 31, a screw 34 threaded to the upper end of the column 32, a fixing ring 331 sleeved on the screw 34, a rotating frame 332 rotatably mounted on the fixing ring 331, a side plate 333 fixed on the side of the rotating frame 332 away from the fixing ring 331, and a fixing shaft 334 fixed between the side plates 333. The rotating frame 332 is connected to the fixing device 35 through a transmission member 36.

[0052] This design is for reference. Figure 5-7 , Figure 8-9 ,as well as Figure 13 The rotating frame 332 can rotate relative to the fixed ring 331. This design provides greater flexibility, allowing users to adjust the position and angle of the rotating frame 332 as needed, thereby changing the installation position of the fixing device 35, thus facilitating the installation and fixing of the cover plate 2. The screw 34 is threadedly connected to the column 32, driving the fixed ring 331 to move downward. The rotating frame 332 is movably sleeved on the fixed ring 331, allowing the rotating frame 332 to move downward with the fixed ring 331, thereby causing the fixing device 35 to move downward and abut against the cover plate 2 for fixing. It is connected to the fixing device 35 through the transmission component 36. The connecting component 33 can be effectively linked with other equipment or structures, thereby expanding its functions and scope. The rotating frame 332 has a rotating hole 3323 for the fixed ring 331 to move, and a moving hole 3322 for the lifting rod 3521 and the pressing rod 3523 to move.

[0053] In one embodiment, the fixing device 35 includes a first fixing plate 351 and a second fixing plate 352. A lifting rod 3521 is fixed to the upper end of the second fixing plate 352, and a pressing rod 3523 is fixed to the upper end of the second fixing plate 352. Both the lifting rod 3521 and the pressing rod 3523 are mounted on the rotating frame 332. A guide rod 3511 is fixed to the upper end of the first fixing plate 351. The guide rod 3511 is mounted on the second fixing plate 352, and a limit block 3512 is fixed to the upper end of the guide rod 3511.

[0054] This design is for reference. Figure 5-7 , Figure 8-9 ,as well as Figure 13 When the screw 34 drives the first fixing plate 351 to move down and abut against the cover plate 2, the fixing of the cover plate 2 is completed. When the cover plate 2 is impacted and moves upward, it drives the first fixing plate 351 to move upward, thereby causing the transmission component 36 to move and release the restriction of the transmission component 36 on the protective component 37. When the first fixing plate 351 moves upward and contacts the second fixing plate 352, it drives the second fixing plate 352 to move upward, causing the second fixing plate 352 to drive the lifting rod 3521 to move upward, pushing the protective component 37 to rotate and knocking the upper end of the cover plate 2, which enhances the stability and reliability of the cover plate 2 fixing and effectively prevents the cover plate 2 from being blown open when subjected to the impact of explosion.

[0055] In one embodiment, the lifting rod 3521 and the pressing rod 3523 are fitted with an elastic element 3522 between the second fixed plate 352 and the rotating frame 332. The elastic element 3522 is made of a damped spring or an elastic pad.

[0056] This design is for reference. Figure 5-7 ,as well as Figure 13 During the upward movement of the second fixed plate 352, the elastic element 3522 is compressed. When the cover plate 2 is no longer impacted, the elastic element 3522 can drive the second fixed plate 352 to move downward. The elastic element 3522 can absorb part of the impact force, reduce the direct collision between components, and thus protect the relevant components from damage.

[0057] In one embodiment, the transmission component 36 includes a vertical plate 3513 fixed to the upper end of the first fixed plate 351 and passing through the rotating frame 332, a first rack 3514 fixed to the vertical plate 3513, a connecting plate 3524 fixed to the upper end of the pressing rod 3523, a gear 361 rotatably disposed on the upper end of the connecting plate 3524 and meshing with the first rack 3514, and a second rack 362 slidably disposed on the connecting plate 3524 and meshing with the gear 361. A baffle 364 is provided on the side of the second rack 362 near the protective component 37, and a through hole 3321 is provided on the rotating frame 332 for the vertical plate 3513 to move.

[0058] This design is for reference. Figure 11 ,as well as Figure 13 When the first fixed plate 351 moves the vertical plate 3513 upward, the first rack 3514 meshes with the gear 361, which in turn causes the second rack 362 to slide inside the connecting plate 3524, thereby causing the baffle 364 to be pulled away from the upper end of the protective member 37. The opening of the perforation 3321 also provides stable guidance and support for the movement of the vertical plate 3513, further improving the safety and stability of the operation.

[0059] In one embodiment, the protective member 37 includes a horizontal plate 371 passing through the fixed shaft 334, an inclined plate 372 disposed on the side of the horizontal plate 371 away from the rotating frame 332 and inclined, and a protective rod 373 fixed to the lower end of the inclined plate 372. The horizontal plate 371 abuts against the lifting rod 3521, and the limiting plate 363 abuts against the upper end of the horizontal plate 371.

[0060] This design is for reference. Figure 5-7 ,as well as Figure 13The baffle 364 is pulled away from the upper end of the horizontal plate 371. Then, when the lifting rod 3521 moves upward, it drives the horizontal plate 371 to rotate clockwise along the fixed shaft 334. This causes the inclined plate 372 to drive the protective rod 373 to strike the cover plate 2 downward, limiting the upward movement distance of the cover plate 2 and further enhancing safety. This reduces the probability of accidents and ensures the safety of operators.

[0061] In one embodiment, a limiting plate 363 is provided at the position where the second rack 362 connects to the connecting plate 3524, and a groove 35241 for the limiting plate 363 to move is provided on the connecting plate 3524.

[0062] This design is for reference. Figure 11 The slide 35241 provides a clear movement path for the limiting plate 363, ensuring that the second rack 362 can slide smoothly along the predetermined direction. The limiting plate 363 can effectively limit the movement range of the second rack 362, prevent it from deviating from the predetermined movement track, ensure the stability and reliability of the transmission system, and avoid failures or damage caused by excessive movement of the second rack 362.

[0063] In one embodiment, the cover plate 2 includes a steel plate 21, a sound-absorbing plate 22 fixed to the lower end of the steel plate 21, and a protective plate 23 fixed to the lower end of the sound-absorbing plate 22. A first fixing plate 351 is fixed to the upper end of the steel plate 21.

[0064] This design is for reference. Figure 8 The steel plate 21, as the main structural material of the cover plate 2, has good strength and rigidity, ensuring the stability and load-bearing capacity of the entire cover plate 2. The first fixing plate 351 is fixed to the upper end of the steel plate 21, further enhancing the stability and installation firmness of the cover plate 2, and preventing the cover plate 2 from breaking off from the upper end of the wellhead 101 when subjected to explosive impact. The sound-absorbing plate 22 effectively absorbs the noise generated during the blasting process.

[0065] In one embodiment, the soundproof shed 1 includes a frame 12 and a soundproof panel 13 disposed on the outside of the frame 12. A door 11 is provided on one side of the soundproof shed 1, and a roof 14 is provided at the top of the soundproof shed 1.

[0066] This design is for reference. Figure 1-4 The sound insulation panel 13 uses professional sound insulation materials, such as high-density fiberboard or composite sound insulation materials. These materials can effectively absorb, reflect or isolate sound waves, thereby achieving excellent sound insulation effect. The frame 12, as the skeleton of the soundproof shed 1, provides a stable support structure, ensuring the overall stability and durability of the soundproof shed 1.

[0067] A method for noise reduction during subway construction, used to operate a noise reduction device for subway construction according to any one of claims 1-9, includes the following steps:

[0068] S1. Pre-embed high-strength bolts on the outside of the wellhead 101, install the frame 12 of the soundproof canopy 1 on the pre-embedded bolts, and finally install the soundproof panel 13 on the frame 12 to complete the installation and fixing of the soundproof canopy 1.

[0069] S2. When carrying out blasting work, fix the cover plate 2 to the upper end of the wellhead 101, then rotate the connector 33 to move the fixing device 35 to the upper end of the cover plate 2, and then fix the fixing device 35 to the upper end of the cover plate 2 to complete the fixing work of the cover plate 2, so as to prevent the cover plate 2 from breaking off from the upper end of the wellhead 101 after being subjected to the impact force of blasting.

[0070] S3. When the cover plate 2 is subjected to an impact force, it will move upward, and then drive the first fixed plate 351 to move upward. Then the first fixed plate 351 drives the transmission component 36 to move, releasing the restriction of the transmission component 36 on the protective component 37. Then, when the first fixed plate 351 drives the second fixed plate 352 to move upward, the second fixed plate 352 drives the protective component 37 to move downward and strike the cover plate 2, causing the cover plate 2 to move downward. This can limit the upward movement distance of the cover plate 2.

[0071] Furthermore, if the embodiments involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relation to the specification. The significance or implied number of the indicated technical features is not specified. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

Claims

1. A noise reduction device for subway construction, comprising a soundproof canopy (1) installed outside the manhole (101) and a cover plate (2) fixed to the upper end of the manhole (101), characterized in that, Also includes: A fixing unit (3) is provided on the outside of the wellhead (101) for fixing the cover plate (2); The fixing unit (3) includes: The base plate (31) is fixed to the outside of the wellhead (101); The connector (33) is adjustablely disposed at the upper end of the base plate (31); A fixing device (35) is provided on the connector (33) for fixing the cover plate (2); A protective component (37) is provided on the connector (33) and connected to the fixing device (35) for protecting the cover plate (2); The connector (33) includes a column (32) threaded to the upper end of the base plate (31), a screw (34) threaded to the upper end of the column (32), a fixing ring (331) sleeved on the screw (34), a rotating frame (332) rotatably mounted on the fixing ring (331), a side plate (333) fixed on the side of the rotating frame (332) away from the fixing ring (331), and a fixing shaft (334) fixed between the side plates (333). The rotating frame (332) is connected to the fixing device (35) through a transmission component (36). The fixing device (35) includes a first fixing plate (351) and a second fixing plate (352). A lifting rod (3521) is fixed to the upper end of the second fixing plate (352), and a pressing rod (3523) is fixed to the upper end of the second fixing plate (352). The lifting rod (3521) and the pressing rod (3523) are both mounted on the rotating frame (332). A guide rod (3511) is fixed to the upper end of the first fixing plate (351). The guide rod (3511) is mounted on the second fixing plate (352), and a limit block (3512) is fixed to the upper end of the guide rod (3511). The transmission component (36) includes a vertical plate (3513) fixed to the upper end of the first fixed plate (351) and passing through the rotating frame (332), a first rack (3514) fixed to the vertical plate (3513), a connecting plate (3524) fixed to the upper end of the pressing rod (3523), a gear (361) rotatably disposed on the upper end of the connecting plate (3524) and meshing with the first rack (3514), and a second rack (362) slidably disposed on the connecting plate (3524) and meshing with the gear (361). A baffle (364) is provided on the side of the second rack (362) near the protective component (37). A through hole (3321) is provided on the rotating frame (332) for the vertical plate (3513) to move.

2. The noise reduction device for subway construction according to claim 1, characterized in that: The lifting rod (3521) and the pressing rod (3523) are fitted with elastic elements (3522) between the second fixed plate (352) and the rotating frame (332).

3. The noise reduction device for subway construction according to claim 1, characterized in that: The protective component (37) includes a horizontal plate (371) passing through the fixed shaft (334), an inclined plate (372) disposed on the side of the horizontal plate (371) away from the rotating frame (332) and inclined, and a protective rod (373) fixed to the lower end of the inclined plate (372). The horizontal plate (371) abuts against the lifting rod (3521), and the limiting plate (363) abuts against the upper end of the horizontal plate (371).

4. The noise reduction device for subway construction according to claim 1, characterized in that: A limiting plate (363) is provided at the position where the second rack (362) connects with the connecting plate (3524), and a groove (35241) is provided on the connecting plate (3524) for the limiting plate (363) to move.

5. A noise reduction device for subway construction according to claim 1, characterized in that: The cover plate (2) includes a steel plate (21), a sound-absorbing plate (22) fixed to the bottom of the steel plate (21), and a protective plate (23) fixed to the bottom of the sound-absorbing plate (22). The first fixing plate (351) is fixed to the top of the steel plate (21).

6. The noise reduction device for subway construction according to claim 1, characterized in that: The soundproof shed (1) includes a frame (12) and a soundproof panel (13) disposed on the outside of the frame (12). A door (11) is provided on one side of the soundproof shed (1), and a roof (14) is provided at the top of the soundproof shed (1).

7. A method for noise reduction during subway construction, employing a noise reduction device for subway construction as described in any one of claims 1-6, characterized in that: Includes the following steps: S1. Pre-embed high-strength bolts on the outside of the wellhead (101), install the frame (12) of the soundproof shed (1) on the pre-embedded bolts, and finally install the soundproof board (13) on the frame (12) to complete the installation and fixing of the soundproof shed (1); S2. When carrying out blasting work, fix the cover plate (2) to the upper end of the wellhead (101), then rotate the connector (33) to move the fixing device (35) to the upper end of the cover plate (2), and then fix the fixing device (35) to the upper end of the cover plate (2) to complete the fixing of the cover plate (2) and prevent the cover plate (2) from being subjected to After the blasting impact, it bursts open from the top of the wellhead (101); S3, when the cover plate (2) is subjected to the impact force, it will move upward, and then drive the first fixed plate (351) to move upward. Then the first fixed plate (351) drives the transmission component (36) to move, releasing the restriction of the transmission component (36) on the protective component (37). Then when the first fixed plate (351) drives the second fixed plate (352) to move upward, the second fixed plate (352) drives the protective component (37) to move downward to strike the cover plate (2), and drive the cover plate (2) to move downward. The upward movement distance of the cover plate (2) can be limited.

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