A sealing structure for a double-layer self-locking manhole cover and a use method thereof

Abstract

The application discloses a sealing structure and a using method of a double-layer self-locking well lid, and belongs to the technical field of double-layer self-locking well lids. The application comprises a well seat, wherein an upper well lid and a lower well lid are arranged on the well seat, the upper well lid and the lower well lid are embedded in step grooves arranged on the well seat, the upper well lid and the lower well lid are fixed on the well seat through a self-locking mechanism, and the upper well lid and the lower well lid are sealingly connected in the well seat through a sealing mechanism. The application solves the problem of poor sealing performance of the existing double-layer self-locking well lid, which leads to poor waterproof effect of the well lid, and water easily enters the well lid to damage the power facilities in the well lid. The application can improve the sealing performance and waterproof effect of the double-layer self-locking well lid, so that water is not easy to enter the well lid to damage the power facilities in the well lid, and the use effect of the double-layer self-locking well lid is improved.

Description

Technical Field

[0001] This invention relates to the field of double-layer self-locking manhole cover technology, specifically to a sealing structure and method of use for double-layer self-locking manhole covers. Background Technology

[0002] Manhole covers are common road auxiliary equipment, mainly used to shield underground pipelines and provide access for construction workers. Currently, manhole covers are generally placed directly on concrete manhole openings. If these covers are stolen, the manhole opening is left exposed, posing a safety hazard. Furthermore, since manhole covers are usually detachable, the joints can loosen after prolonged exposure to traffic, shortening their lifespan.

[0003] Chinese patent CN206902754U discloses a double-layer self-locking manhole cover. This manhole cover, due to its self-locking capability, is not easily stolen; because it is a double-layer cover, even if the upper layer is stolen, the lower layer still remains in place, essentially eliminating safety hazards; and because it incorporates a self-locking spring, the connection is more stable and less prone to loosening, thus extending the cover's lifespan. However, the aforementioned double-layer self-locking manhole cover has the following drawbacks in practical use:

[0004] Current double-layer self-locking manhole covers have poor sealing performance, resulting in poor waterproofing and making it easy for water to enter the manhole cover and damage the electrical facilities inside. Summary of the Invention

[0005] The purpose of this invention is to provide a sealing structure and method for use of double-layer self-locking manhole covers, which can improve the sealing performance and waterproof effect of double-layer self-locking manhole covers, making it difficult for water to enter the manhole cover and damage the electrical facilities inside the manhole cover, thereby improving the use effect of double-layer self-locking manhole covers and solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A sealing structure for a double-layer self-locking manhole cover includes a manhole base, on which an upper manhole cover and a lower manhole cover are provided. The upper and lower manhole covers are both embedded in a stepped groove provided on the manhole base. The upper and lower manhole covers are fixed to the manhole base by a self-locking mechanism, and the upper and lower manhole covers are sealed and connected in the manhole base by a sealing mechanism.

[0008] Preferably, the self-locking mechanism includes a control lever, a rotating shaft, a transmission shaft, a helical spring, a telescopic guide rod, and a self-locking rod. The control lever is connected to the transmission shaft via the rotating shaft. The transmission shaft is mounted on the upper manhole cover via bearings. The self-locking rod is embedded at the end of the control lever away from the transmission shaft. The self-locking rod is inserted into the upper manhole cover. The self-locking rod is connected to the control lever via the helical spring and the telescopic guide rod. The helical spring is located on the periphery of the telescopic guide rod, and one end of the helical spring and the telescopic guide rod is connected to the self-locking rod. The other end of the helical spring and the telescopic guide rod is connected to the inner wall of the control lever.

[0009] Preferably, the self-locking mechanism further includes a transmission worm, a transmission worm wheel, a drive shaft, and a drive gear. The transmission worm is mounted on the upper and lower manhole covers via bearings, and the transmission worm is connected to the drive shaft via a coupling. The transmission worm and the transmission worm wheel mesh with each other. The transmission worm wheel is mounted on the drive shaft via a spline. The drive shaft is also equipped with a drive gear, which is located on one side of the transmission worm wheel. The drive shaft is mounted on the upper and lower manhole covers via bearings.

[0010] Preferably, the self-locking mechanism further includes a transmission rack, a guide linkage frame, and a self-locking block. The transmission rack meshes with a drive gear and is connected to the guide linkage frame. The guide linkage frame is embedded in the upper and lower manhole covers and is connected to a self-locking block for locking the upper and lower manhole covers in the manhole seat.

[0011] Preferably, the self-locking mechanism further includes a compression spring and a telescopic guide post. The compression spring is located around the telescopic guide post. One end of both the compression spring and the telescopic guide post is connected to the self-locking block, and the other end of both the compression spring and the telescopic guide post is connected to the inner walls of the upper and lower manhole covers.

[0012] Preferably, the sealing mechanism includes a first sealing ring and a second sealing ring. The first sealing ring is disposed in a stepped groove provided on the well base, and the second sealing ring is disposed on the upper well cover and the lower well cover. The upper well cover and the lower well cover are sealed and connected to the well base by the interference fit of the first sealing ring and the second sealing ring.

[0013] Preferably, the sealing mechanism further includes a first sealing plate and a second sealing plate. The first sealing plate is disposed in a locking groove provided on the well base for the self-locking block to be inserted into, and the second sealing plate is disposed on the self-locking block. The self-locking block is sealed in the locking groove provided on the well base by the first sealing plate and the second sealing plate.

[0014] Preferably, the first sealing sheet is provided with a first tooth, and the second sealing sheet is provided with a second tooth. The first tooth and the second tooth are staggered and interlock with each other.

[0015] According to another aspect of the present invention, a method of using a sealing structure for a double-layer self-locking manhole cover is provided, applied to a sealing structure for a double-layer self-locking manhole cover as described above, comprising the following steps:

[0016] S1: The upper and lower manhole covers are installed in the stepped grooves set on the manhole base. The upper and lower manhole covers are sealed and connected to the manhole base by the interference fit of the first and second sealing rings.

[0017] S2: The control lever drives the drive shaft and drive worm to rotate. Since the drive worm and drive worm wheel mesh, the drive worm drives the drive worm wheel, drive shaft and drive gear to rotate during the rotation process.

[0018] S3: During the rotation of the drive gear, the transmission rack, guide linkage frame and self-locking block move horizontally, and the traction compression spring and telescopic guide column extend, so that the self-locking block enters the locking groove set on the well base;

[0019] S4: During the horizontal movement of the self-locking block, the second sealing plate is in close contact with the first sealing plate, so that the first and second teeth are staggered and the first and second teeth are engaged with each other. At this time, the self-locking block is sealed in the locking groove set on the well seat by the first and second sealing plates.

[0020] S5: After the upper and lower manhole covers are sealed and installed, press the self-locking rod. The helical spring and telescopic guide rod will contract due to the squeezing force, and drive the self-locking rod and the control rod to rotate under the support of the rotating shaft. After the control rod is rotated to a horizontal state, release the self-locking rod so that the self-locking rod is inserted into the upper manhole cover.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention uses a self-locking mechanism to fix the upper and lower manhole covers to the manhole base. The control lever drives the transmission shaft and transmission worm gear to rotate, causing the transmission worm wheel, drive shaft and drive gear to rotate. This drives the transmission rack, guide linkage frame and self-locking block to move horizontally. At the same time, the traction compression spring and telescopic guide column extend, so that the self-locking block enters the locking groove set on the manhole base, so that the upper and lower manhole covers are firmly connected to the manhole base.

[0023] 2. This invention uses a sealing mechanism to seal the upper and lower manhole covers within the manhole base. The upper and lower manhole covers are installed in stepped grooves on the manhole base. The upper and lower manhole covers are sealed to the manhole base by an interference fit between the first and second sealing rings. During the horizontal movement of the self-locking block, the second sealing plate is in close contact with the first sealing plate, causing the first and second teeth to be staggered and interlocked. At this time, the self-locking block is sealed in the locking groove on the manhole base by the first and second sealing plates, which can improve the sealing performance and waterproof effect of the double-layer self-locking manhole cover, making it difficult for water to enter the manhole cover and damage the electrical facilities inside, thus improving the use effect of the double-layer self-locking manhole cover. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the sealing structure for a double-layer self-locking manhole cover according to the present invention;

[0025] Figure 2 This is an exploded view of the sealing structure for a double-layer self-locking manhole cover according to the present invention;

[0026] Figure 3 For the present invention Figure 1 Enlarged view of point A in the image;

[0027] Figure 4 For the present invention Figure 3 Enlarged view of point B in the image;

[0028] Figure 5 For the present invention Figure 4 Enlarged view of point C in the image;

[0029] Figure 6 For the present invention Figure 1 Enlarged view of point D in the image;

[0030] Figure 7 This is a schematic diagram of the first and second sealing sheets of the present invention.

[0031] In the diagram: 1. Manhole base; 11. Upper manhole cover; 12. Lower manhole cover; 2. Self-locking mechanism; 21. Control lever; 22. Rotating shaft; 23. Drive shaft; 24. Helical spring; 25. Telescopic guide rod; 26. Self-locking rod; 27. Drive worm gear; 28. Drive worm wheel; 29. ​​Drive shaft; 210. Drive gear; 211. Drive rack; 212. Guide linkage frame; 213. Self-locking block; 214. Compression spring; 215. Telescopic guide column; 3. Sealing mechanism; 31. First sealing ring; 32. Second sealing ring; 33. First sealing plate; 331. First connecting tooth; 34. Second sealing plate; 341. Second connecting tooth. Detailed Implementation

[0032] 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.

[0033] To address the problem of existing double-layer self-locking manhole covers having poor sealing performance, resulting in inadequate waterproofing and allowing water to easily enter and damage electrical facilities inside the manhole cover, please refer to [link to relevant documentation]. Figures 1-7 This embodiment provides the following technical solution:

[0034] A sealing structure for a double-layer self-locking manhole cover includes a manhole base 1, on which an upper manhole cover 11 and a lower manhole cover 12 are provided. The upper manhole cover 11 and the lower manhole cover 12 are both embedded in a stepped groove provided on the manhole base 1. The upper manhole cover 11 and the lower manhole cover 12 are fixed to the manhole base 1 by a self-locking mechanism 2, and the upper manhole cover 11 and the lower manhole cover 12 are sealed and connected in the manhole base 1 by a sealing mechanism 3.

[0035] The self-locking mechanism 2 includes a control lever 21, a rotating shaft 22, a transmission shaft 23, a helical spring 24, a telescopic guide rod 25, and a self-locking rod 26. The control lever 21 is connected to the transmission shaft 23 via the rotating shaft 22. The transmission shaft 23 is mounted on the upper manhole cover 11 via bearings. The self-locking rod 26 is embedded at the end of the control lever 21 away from the transmission shaft 23. The self-locking rod 26 is inserted into the upper manhole cover 11. The self-locking rod 26 is connected to the control lever 21 via the helical spring 24 and the telescopic guide rod 25. The helical spring 24 is located on the periphery of the telescopic guide rod 25, and one end of the helical spring 24 and the telescopic guide rod 25 is connected to the self-locking rod 26. The other end of the helical spring 24 and the telescopic guide rod 25 is connected to the inner wall of the control lever 21.

[0036] The self-locking mechanism 2 also includes a transmission worm 27, a transmission worm wheel 28, a drive shaft 29, and a drive gear 210. The transmission worm 27 is mounted on the upper manhole cover 11 and the lower manhole cover 12 via bearings, and the transmission worm 27 is connected to the drive shaft 23 via a coupling. The transmission worm 27 and the transmission worm wheel 28 mesh with each other. The transmission worm wheel 28 is mounted on the drive shaft 29 via a spline. The drive gear 210 is also mounted on the drive shaft 29. The drive gear 210 is located on one side of the transmission worm wheel 28. The drive shaft 29 is mounted on the upper manhole cover 11 and the lower manhole cover 12 via bearings.

[0037] The self-locking mechanism 2 also includes a transmission rack 211, a guide linkage frame 212, and a self-locking block 213. The transmission rack 211 meshes with the drive gear 210, and the transmission rack 211 is connected to the guide linkage frame 212. The guide linkage frame 212 is embedded in the upper manhole cover 11 and the lower manhole cover 12. The guide linkage frame 212 is connected to a self-locking block 213 for locking the upper manhole cover 11 and the lower manhole cover 12 in the manhole seat 1.

[0038] The self-locking mechanism 2 also includes a compression spring 214 and a telescopic guide post 215. The compression spring 214 is located on the periphery of the telescopic guide post 215. One end of the compression spring 214 and the telescopic guide post 215 are both connected to the self-locking block 213, and the other end of the compression spring 214 and the telescopic guide post 215 are both connected to the inner walls of the upper manhole cover 11 and the lower manhole cover 12.

[0039] The sealing mechanism 3 includes a first sealing ring 31 and a second sealing ring 32. The first sealing ring 31 is disposed in the stepped groove provided on the well base 1, and the second sealing ring 32 is disposed on the upper well cover 11 and the lower well cover 12. The upper well cover 11 and the lower well cover 12 are sealed and connected to the well base 1 by the interference fit of the first sealing ring 31 and the second sealing ring 32.

[0040] The sealing mechanism 3 also includes a first sealing plate 33 and a second sealing plate 34. The first sealing plate 33 is disposed in a locking groove provided on the well base 1 for the self-locking block 213 to be inserted into, and the second sealing plate 34 is disposed on the self-locking block 213. The self-locking block 213 is sealed in the locking groove provided on the well base 1 by the first sealing plate 33 and the second sealing plate 34.

[0041] The first sealing plate 33 is provided with a first tooth 331, and the second sealing plate 34 is provided with a second tooth 341. The first tooth 331 and the second tooth 341 are staggered and interlocked.

[0042] Working principle: The upper manhole cover 11 and the lower manhole cover 12 are installed in the stepped groove provided on the manhole base 1. The upper manhole cover 11 and the lower manhole cover 12 are sealed to the manhole base 1 by an interference fit of the first sealing ring 31 and the second sealing ring 32. The control lever 21 drives the transmission shaft 23 and the transmission worm 27 to rotate. Since the transmission worm 27 meshes with the transmission worm wheel 28, the transmission worm 27 drives the transmission worm wheel 28, the drive shaft 29 and the drive gear 210 to rotate during the rotation. Since the transmission rack 211 meshes with the drive gear 210, the drive gear 210 can drive the transmission rack 211, the guide linkage frame 212 and the self-locking block 213 to move horizontally during the rotation. At the same time, the traction compression spring 214 and the telescopic guide column 215 extend, so that the self-locking block 213 enters the manhole base 1. In the locking groove provided on the upper part, during the horizontal movement of the self-locking block 213, the second sealing plate 34 is tightly attached to the first sealing plate 33, so that the first connecting teeth 331 and the second connecting teeth 341 are staggered and interlocked. At this time, the self-locking block 213 is sealed in the locking groove provided on the well seat 1 by the first sealing plate 33 and the second sealing plate 34. After the upper well cover 11 and the lower well cover 12 are sealed and installed, the self-locking rod 26 is pressed. The spiral spring 24 and the telescopic guide rod 25 are compressed due to the squeezing force, and drive the self-locking rod 26 and the operating rod 21 to rotate under the support of the rotating shaft 22. After the operating rod 21 is rotated to the horizontal state, the self-locking rod 26 is released, and the self-locking rod 26 is inserted into the upper well cover 11. At this time, the upper well cover 11 and the lower well cover 12 are sealed and installed in the well seat 1.

[0043] To better demonstrate the usage process of the sealing structure for a double-layer self-locking manhole cover, this embodiment proposes a method for using the sealing structure for a double-layer self-locking manhole cover, applied to the sealing structure for a double-layer self-locking manhole cover as described above, including the following steps:

[0044] S1: The upper manhole cover 11 and the lower manhole cover 12 are installed in the stepped groove provided on the manhole base 1. The upper manhole cover 11 and the lower manhole cover 12 are sealed and connected to the manhole base 1 by the interference fit of the first sealing ring 31 and the second sealing ring 32.

[0045] S2: The control lever 21 drives the transmission shaft 23 and the transmission worm 27 to rotate. Since the transmission worm 27 and the transmission worm wheel 28 are meshed, the transmission worm 27 drives the transmission worm wheel 28, the drive shaft 29 and the drive gear 210 to rotate during the rotation process.

[0046] S3: During the rotation of the drive gear 210, the transmission rack 211, the guide linkage frame 212 and the self-locking block 213 move horizontally, and the traction compression spring 214 and the telescopic guide column 215 extend, so that the self-locking block 213 enters the locking groove set on the well base 1.

[0047] S4: During the horizontal movement of the self-locking block 213, the second sealing plate 34 is in close contact with the first sealing plate 33, so that the first connecting teeth 331 and the second connecting teeth 341 are staggered and the first connecting teeth 331 and the second connecting teeth 341 are engaged with each other. At this time, the self-locking block 213 is sealed in the locking groove provided on the well seat 1 by the first sealing plate 33 and the second sealing plate 34.

[0048] S5: After the upper manhole cover 11 and the lower manhole cover 12 are sealed and installed, press the self-locking rod 26. The helical spring 24 and the telescopic guide rod 25 will contract due to the squeezing force, and drive the self-locking rod 26 and the operating rod 21 to rotate under the support of the rotating shaft 22. After the operating rod 21 is rotated to a horizontal state, release the self-locking rod 26 so that the self-locking rod 26 is inserted into the upper manhole cover 11.

[0049] In summary, the sealing structure and usage method for double-layer self-locking manhole covers of the present invention involves installing the upper manhole cover 11 and the lower manhole cover 12 in a stepped groove provided on the manhole base 1. The upper manhole cover 11 and the lower manhole cover 12 are sealed to the manhole base 1 by an interference fit of the first sealing ring 31 and the second sealing ring 32. The control lever 21 drives the transmission shaft 23 and the transmission worm gear 27 to rotate, causing the transmission worm wheel 28, the drive shaft 29, and the drive gear 210 to rotate. During the rotation of the drive gear 210, the transmission rack 211, the guide linkage frame 212, and the self-locking block 213 to move horizontally, and the traction compression spring 21... 4. The telescopic guide column 215 extends, allowing the self-locking block 213 to enter the locking groove provided on the well base 1. During the horizontal movement of the self-locking block 213, the second sealing plate 34 is tightly attached to the first sealing plate 33, so that the first connecting teeth 331 and the second connecting teeth 341 are staggered and interlocked. At this time, the self-locking block 213 is sealed in the locking groove provided on the well base 1 by the first sealing plate 33 and the second sealing plate 34, which can improve the sealing performance and waterproof effect of the double-layer self-locking well cover, making it difficult for water to enter the well cover and damage the electrical facilities inside the well cover, thus improving the use effect of the double-layer self-locking well cover.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a double-layer self-locking manhole cover, comprising a manhole base (1), characterized in that, The well base (1) is provided with an upper well cover (11) and a lower well cover (12). The upper well cover (11) and the lower well cover (12) are both embedded in the stepped groove provided on the well base (1). The upper well cover (11) and the lower well cover (12) are fixed on the well base (1) by a self-locking mechanism (2), and the upper well cover (11) and the lower well cover (12) are sealed and connected in the well base (1) by a sealing mechanism (3). The sealing mechanism (3) includes a first sealing ring (31) and a second sealing ring (32). The first sealing ring (31) is disposed in a stepped groove provided on the well seat (1). The second sealing ring (32) is disposed on the upper well cover (11) and the lower well cover (12). The upper well cover (11) and the lower well cover (12) are sealed and connected to the well seat (1) by the interference fit of the first sealing ring (31) and the second sealing ring (32). The sealing mechanism (3) further includes a first sealing plate (33) and a second sealing plate (34). The first sealing plate (33) is disposed in a locking groove provided on the well base (1) for the self-locking block (213) to be inserted. The second sealing plate (34) is disposed on the self-locking block (213). The self-locking block (213) is sealed in the locking groove provided on the well base (1) by the first sealing plate (33) and the second sealing plate (34). The first sealing plate (33) is provided with a first tooth (331), and the second sealing plate (34) is provided with a second tooth (341). The first tooth (331) and the second tooth (341) are staggered and interlocked. The self-locking mechanism (2) further includes a transmission rack (211), a guide linkage frame (212), and a self-locking block (213). The transmission rack (211) meshes with a drive gear (210) and is connected to the guide linkage frame (212). The guide linkage frame (212) is embedded in the upper manhole cover (11) and the lower manhole cover (12). The guide linkage frame (212) is connected to a self-locking block (213) for locking the upper manhole cover (11) and the lower manhole cover (12) in the manhole seat (1). The self-locking mechanism (2) also includes a compression spring (214) and a telescopic guide post (215). The compression spring (214) is located on the periphery of the telescopic guide post (215). One end of the compression spring (214) and the telescopic guide post (215) are both connected to the self-locking block (213). The other end of the compression spring (214) and the telescopic guide post (215) are both connected to the inner walls of the upper manhole cover (11) and the lower manhole cover (12).

2. The sealing structure for a double-layer self-locking manhole cover according to claim 1, characterized in that: The self-locking mechanism (2) includes a control lever (21), a rotating shaft (22), a transmission shaft (23), a helical spring (24), a telescopic guide rod (25), and a self-locking rod (26). The control lever (21) is connected to the transmission shaft (23) via the rotating shaft (22). The transmission shaft (23) is mounted on the upper manhole cover (11) via bearings. The self-locking rod (26) is embedded at the end of the control lever (21) away from the transmission shaft (23). The self-locking rod (26) is inserted into the upper manhole cover (11). The self-locking rod (26) is connected to the control lever (21) via the helical spring (24) and the telescopic guide rod (25). The helical spring (24) is located on the periphery of the telescopic guide rod (25), and one end of the helical spring (24) and the telescopic guide rod (25) is connected to the self-locking rod (26). The other end of the helical spring (24) and the telescopic guide rod (25) is connected to the inner wall of the control lever (21).

3. A sealing structure for a double-layer self-locking manhole cover according to claim 2, characterized in that: The self-locking mechanism (2) further includes a transmission worm (27), a transmission worm wheel (28), a drive shaft (29), and a drive gear (210). The transmission worm (27) is mounted on the upper manhole cover (11) and the lower manhole cover (12) by bearings, and the transmission worm (27) is connected to the drive shaft (23) by a coupling. The transmission worm (27) and the transmission worm wheel (28) mesh. The transmission worm wheel (28) is mounted on the drive shaft (29) by a spline. The drive shaft (29) is also equipped with a drive gear (210), which is located on one side of the transmission worm wheel (28). The drive shaft (29) is mounted on the upper manhole cover (11) and the lower manhole cover (12) by bearings.

4. A method of using the sealing structure for a double-layer self-locking manhole cover as described in claim 3, characterized in that, Includes the following steps: S1: Install the upper manhole cover (11) and the lower manhole cover (12) in the stepped groove provided on the manhole base (1). The upper manhole cover (11) and the lower manhole cover (12) are sealed and connected to the manhole base (1) by the interference fit of the first sealing ring (31) and the second sealing ring (32). S2: The transmission shaft (23) and the transmission worm (27) are rotated by the control lever (21). Since the transmission worm (27) and the transmission worm wheel (28) are meshed, the transmission worm (27) drives the transmission worm wheel (28), the drive shaft (29) and the drive gear (210) to rotate during the rotation process. S3: During the rotation of the drive gear (210), the transmission rack (211), the guide linkage frame (212) and the self-locking block (213) move horizontally, and the traction compression spring (214) and the telescopic guide column (215) extend, so that the self-locking block (213) enters the locking groove set on the well seat (1); S4: During the horizontal movement of the self-locking block (213), the second sealing plate (34) is in close contact with the first sealing plate (33), so that the first contact tooth (331) and the second contact tooth (341) are staggered and the first contact tooth (331) and the second contact tooth (341) are engaged with each other. At this time, the self-locking block (213) is sealed in the locking groove provided on the well seat (1) by the first sealing plate (33) and the second sealing plate (34). S5: After the upper manhole cover (11) and the lower manhole cover (12) are sealed and installed, press the self-locking rod (26). The helical spring (24) and the telescopic guide rod (25) will contract due to the squeezing force, and drive the self-locking rod (26) and the control rod (21) to rotate under the support of the rotating shaft (22). After the control rod (21) is rotated to a horizontal state, release the self-locking rod (26) so that the self-locking rod (26) is inserted into the upper manhole cover (11).

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