Well lid buckling and locking mechanism

Abstract

The well lid buckling and locking mechanism comprises a well base, a well lid body and a rotating assembly, wherein the well lid body is installed on the well base and used for covering the well base, and the rotating assembly is arranged on the well base and used for rotationally connecting the well base and the well lid body. The well seat comprises a well body, a rotating shaft groove formed in the well body, a locking groove and a locking piece arranged on the locking groove; the rotating assembly is arranged on the rotating shaft groove; the locking piece comprises horizontal channels formed in the wall faces of the two sides of the locking groove, locking parts arranged in the horizontal channels, limiting rings arranged at the free ends of the horizontal channels and used for limiting the locking parts, and locking channels arranged in the positions, opposite to the well lid body, of the horizontal channels and matched with the locking parts. According to the well lid buckling and locking mechanism, through the structure of the locking piece, unauthorized personnel can be effectively prevented from easily opening the well lid body, and therefore safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of manhole cover technology, and in particular to a manhole cover fastening and locking mechanism. Background Technology

[0002] Manhole covers are an important part of urban infrastructure; they prevent pedestrians and vehicles from falling into manholes and protect underground facilities from external damage. However, traditional manhole cover structures often lack effective locking mechanisms, allowing unauthorized personnel to easily open the manhole covers, which can easily lead to safety hazards. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a manhole cover fastening and locking mechanism.

[0004] The present invention adopts the following technical solution:

[0005] A manhole cover fastening and locking mechanism includes a manhole base, a manhole cover body mounted on the manhole base for closing the manhole base, and a rotating assembly disposed on the manhole base for rotatably connecting the manhole base and the manhole cover body. The manhole base includes a manhole body, a pivot groove disposed on the manhole body, a locking groove, and a locking member disposed on the locking groove. The rotating assembly is disposed on the pivot groove. The locking member includes a horizontal channel disposed on both sides of the locking groove, a locking part disposed in the horizontal channel, a limiting ring disposed at the free end of the horizontal channel for limiting the locking part, and a locking channel disposed on the horizontal channel relative to the manhole cover body that cooperates with the locking part.

[0006] Furthermore, the locking part includes a first spring installed in the horizontal channel and a locking ball installed at the free end of the first spring, with the other end of the locking ball abutting against the limiting ring.

[0007] Furthermore, the locking component also includes a limiting part disposed on the inner wall of the well seat, a fixing part disposed on the bottom of the well cover body, and an elastic part disposed on the fixing part that cooperates with the limiting part.

[0008] Furthermore, the limiting part is an upper convex ring, a lower convex ring, and a limiting cavity formed between the upper convex ring and the lower convex ring disposed on the inner wall of the manhole cover body; the elastic part is an elastic arm installed on the fixing part and an elastic protrusion disposed on the elastic arm that cooperates with the limiting cavity.

[0009] Furthermore, the elastic part also includes a limiting protrusion disposed on the manhole cover body, the limiting protrusion being disposed opposite to the elastic arm.

[0010] Furthermore, the well base also includes an alarm slot disposed on the well body, an installation slot disposed on the inner wall of the alarm slot, and an alarm component disposed in the installation slot.

[0011] Furthermore, the alarm component includes a second spring disposed in the mounting groove, a sensing ball mounted on the free end of the spring, and a buzzer disposed in the well seat and electrically connected to the sensing ball; when the well cover body is opened from the well seat, the sensing ball pops out from the mounting groove, at which time the sensing ball activates the buzzer in the well seat.

[0012] Furthermore, the rotating assembly includes a rotating roller installed in the rotating shaft groove, and the manhole cover body is rotatably mounted on the rotating roller.

[0013] Furthermore, the rotating assembly also includes an installation channel on the rotating roller and a torsion spring disposed on the installation channel.

[0014] Furthermore, the manhole cover fastening and locking mechanism also includes a hidden groove provided on the manhole cover body and a hand handle rotatably installed in the hidden groove.

[0015] The beneficial effects of this utility model are as follows:

[0016] The manhole cover fastening and locking mechanism involved in this utility model can effectively prevent unauthorized personnel from easily opening the manhole cover body through the structure of the locking component, thereby improving safety; the cooperation between the limiting ring and the locking part ensures that the manhole cover body will not be accidentally opened by external force when it is closed, thus ensuring the safety of pedestrians and vehicles. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of a manhole cover fastening and locking mechanism according to an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 Exploded view of the manhole cover locking mechanism;

[0019] Figure 3 for Figure 2 An exploded view of the manhole cover locking mechanism from another angle;

[0020] Figure 4 for Figure 1 Main sectional view of the manhole cover fastening and locking mechanism;

[0021] Figure 5 for Figure 1 A top sectional view of the manhole cover fastening and locking mechanism;

[0022] Figure 6 for Figure 5A partial enlarged view of the manhole cover fastening and locking mechanism;

[0023] Figure 7 for Figure 5 A partial enlarged view of the manhole cover fastening and locking mechanism;

[0024] Figure 8 for Figure 5 The circuit diagram of the alarm component of the manhole cover fastening and locking mechanism.

[0025] 10. Well base; 11. Well body; 12. Rotary shaft groove; 13. Locking groove; 40. Well cover body; 50. Rotating assembly; 14. Locking component; 140. Horizontal channel; 141. Locking part; 142. Limiting ring; 143. Locking channel; 1402. First spring; 1411. Locking ball; 144. Limiting part; 145. Fixing part; 146. Elastic part; 1440. Upper convex ring; 1441. Lower convex ring; 1442. Limiting cavity; 1460. Elastic arm; 1461. Elastic protrusion; 1462. Limiting protrusion; 15. Alarm groove; 16. Mounting groove; 17. Alarm component; 173. Second spring; 171. Sensing ball; 172. Buzzer; 51. Rotating roller; 52. Torsion spring; 80. Concealed groove; 90. Hand handle. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "vertical direction," "up," "down," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Please see Figures 1 to 8 This invention relates to a manhole cover fastening and locking mechanism, comprising a manhole base 10, a manhole cover body 40 mounted on the manhole base 10 for closing the manhole base 10, and a rotating assembly 50 mounted on the manhole base 10 for rotatably connecting the manhole base 10 and the manhole cover body 40. The manhole base 10 includes a manhole body 11, a rotating shaft groove 12 and a locking groove 13 mounted on the manhole body 11, and a locking member 14 mounted on the locking groove 13. The rotating assembly 50 is mounted on the rotating shaft groove 12. The locking member 14 includes a horizontal channel 140 mounted on both sides of the locking groove 13, a locking part 141 mounted in the horizontal channel 140, a limiting ring 142 mounted at the free end of the horizontal channel 140 for limiting the locking part 141, and a locking channel 143 mounted on the horizontal channel 140 relative to the manhole cover body 40 and cooperating with the locking part 141. In this embodiment, the limiting ring 142 is provided with an external thread, and the horizontal channel 140 is provided with an internal thread that mates with the external thread. The limiting ring 142 is threadedly installed on the horizontal channel 140.

[0030] The working principle of the manhole cover fastening and locking mechanism of this utility model is as follows: The rotating component 50 is installed on the rotating shaft groove 12 of the manhole seat 10, which is used to connect the manhole seat 10 and the manhole cover body 40, allowing the manhole cover body 40 to open and close axially around a preset axis, so that the manhole cover body 40 can be easily opened or closed, while ensuring a stable connection between the manhole cover body 40 and the manhole seat 10; the locking component 14 includes a horizontal channel 140, a locking part 141, a limiting ring 142, and a locking channel 143; when the manhole cover body 40 is closed, the locking part 141 moves into the locking channel 143 on the manhole cover body 40 through the horizontal channel 140; the function of the limiting ring 142 is to prevent the locking part 141 from completely disengaging from the horizontal channel 140, ensuring the locking The locking part 141 can move within the correct range to achieve the locking function of the manhole cover body 40. When the manhole cover body 40 needs to be closed, the user closes the manhole cover body 40 to a near-closed position. At this time, the locking part 141 moves within the horizontal channel 140 until it aligns with the locking channel 143 on the manhole cover body 40. Once aligned, the locking part 141 enters the locking channel 143, fixing the locking part 141 and thus firmly locking the manhole cover body 40 onto the manhole seat 10. When the manhole cover body 40 needs to be opened, the manhole cover body 40 is pulled outward to separate the locking part 141 from the locking channel 143. Once the locking part 141 is released, the manhole cover body 40 can be easily rotated open from the closed position by the rotating component 50.

[0031] Compared to existing technologies, the manhole cover locking mechanism of this utility model, through the structure of the locking member 14, can effectively prevent unauthorized personnel from easily opening the manhole cover body 40, thereby improving safety; the cooperation of the limiting ring 142 and the locking part 141 ensures that the manhole cover body 40 will not be accidentally opened by external force when closed, ensuring the safety of pedestrians and vehicles; through the rotating component 50, the manhole cover body 40 can be easily opened and closed around the preset axis, making it easier for maintenance personnel to carry out underground operations; when the manhole cover body 40 is closed, the locking part 141 will automatically enter the locking channel 143, ensuring that the manhole cover body 40 is firmly locked on the manhole seat 10 without additional operation steps; the cooperation of the rotating component 50 and the locking member 14 ensures a stable connection between the manhole cover body 40 and the manhole seat 10, reducing safety hazards caused by loosening or vibration.

[0032] Please refer to Figure 5 and Figure 6The locking part 141 includes a first spring 1402 installed in the horizontal channel 140 and a locking ball 1411 installed at the free end of the first spring 1402. The other end of the locking ball 1411 is positioned to abut against the limiting ring 142. The structure of the first spring 1402 allows the locking ball 1411 to automatically reset when no external force is applied, ensuring that the locking ball 1411 accurately enters the locking channel 143 each time the manhole cover body 40 is closed, thus improving the reliability of locking. The buffering effect of the spring can reduce the impact of the locking ball 1411 during movement, extending the service life of the locking part 141. The cooperation between the locking ball 1411 and the limiting ring 142 effectively prevents unauthorized personnel from easily opening the manhole cover body 40, improving the safety of the manhole cover body 40. Even under external force, the locking ball 1411 is not easily disengaged from the locking channel 143, ensuring the safety of the manhole cover body 40. The cover body 40 will not open accidentally when closed, ensuring the safety of pedestrians and vehicles. When the cover body 40 is closed, the locking ball 1411 automatically enters the locking channel 143 under the action of the spring, eliminating the need for additional operation steps and simplifying the closing process of the cover body 40. When it is necessary to open the cover body 40, simply pull the cover body 40 outward to separate the locking ball 1411 from the locking channel 143, making the operation simple and quick. The cooperation between the first spring 1402 and the locking ball 1411 can effectively reduce the vibration of the cover body 40 during use, ensuring a stable connection between the cover body 40 and the manhole seat 10.

[0033] The locking member 14 also includes a limiting part 144 disposed on the inner wall of the well base 10, a fixing part 145 disposed on the bottom of the well cover body 40, and an elastic part 146 disposed on the fixing part 145 and cooperating with the limiting part 144. The structure of the first spring 1402 enables the locking ball 1411 to automatically reset when no external force is applied. When the manhole cover body 40 is closed, the locking ball 1411 automatically enters the locking channel 143 under the thrust of the spring, ensuring accurate locking every time the manhole cover body 40 is closed; the cooperation between the locking ball 1411 and the limiting ring 142 ensures that the locking part 141 will not easily move or loosen within the horizontal channel 140, thus providing a more stable locking state; the tight cooperation between the locking ball 1411 and the limiting ring 142 makes it difficult for unauthorized personnel to easily open the manhole cover body 40, improving the safety of the manhole cover body 40; even under external force, the locking ball 1411 will not easily disengage from the locking channel 143, ensuring that the manhole cover body 40 will not be easily disengaged when closed. Unexpected opening ensures the safety of pedestrians and vehicles. When the manhole cover body 40 is closed, the locking ball 1411 automatically enters the locking channel 143 under the action of the spring, achieving automatic locking without additional operation steps, simplifying the closing process of the manhole cover body 40. When it is necessary to open the manhole cover body 40, simply pull the manhole cover body 40 outward to separate the locking ball 1411 from the locking channel 143. The operation is simple and quick, reducing the workload of maintenance personnel. The buffering effect of the first spring 1402 can reduce the vibration of the manhole cover body 40 during use, ensuring a stable connection between the manhole cover body 40 and the manhole seat 10, and reducing loosening and damage caused by vibration.

[0034] Please refer to Figures 2 to 4The limiting part 144 is an upper convex ring 1440, a lower convex ring 1441, and a limiting cavity 1442 formed between the upper convex ring 1440 and the lower convex ring 1441, which are disposed on the inner wall of the manhole cover body 40; the elastic part 146 is an elastic arm 1460 installed on the fixing part 145, and an elastic protrusion 1461 on the elastic arm 1460 that cooperates with the limiting cavity 1442. The limiting cavity 1442 formed by the upper convex ring 1440 and the lower convex ring 1441 can precisely limit the position of the elastic protrusion 1461, ensuring that the elastic protrusion 1461 can accurately enter the limiting cavity 1442 when the manhole cover body 40 is closed, providing stable support and locking. The structure of the limiting cavity 1442 can effectively prevent the manhole cover body 40 from loosening due to vibration or external force during use, ensuring a stable connection between the manhole cover body 40 and the manhole seat 10. The cooperation between the elastic protrusion 1461 and the limiting cavity 1442 ensures that the manhole cover body 40 will not be accidentally opened by external force when closed, protecting pedestrians and vehicles. The structure of the limiting cavity 1442 and the elastic protrusion 1461 increases the difficulty of opening the manhole cover, effectively preventing unauthorized personnel from easily opening the manhole cover body 40 and improving the safety of the manhole cover body 40. When the manhole cover body 40 is closed, the elastic protrusion 1461 automatically enters the limiting cavity 1442 under the action of the elastic arm 1460, realizing automatic locking without additional operation steps, simplifying the closing process of the manhole cover body 40. When it is necessary to open the manhole cover body 40, only a slight force needs to be applied by hand to make the elastic protrusion 1461 disengage from the limiting cavity 1442, which is simple and quick to operate and reduces the workload of maintenance personnel.

[0035] The elastic part 146 also includes a limiting protrusion 1462 disposed on the manhole cover body 40, the limiting protrusion 1462 being disposed opposite to the elastic arm 1460. The structure of the limiting protrusion 1462 allows for more precise alignment of the elastic arm 1460 during installation and use, ensuring that the elastic protrusion 1461 can accurately enter the limiting cavity 1442, improving the reliability of locking; the limiting protrusion 1462 can effectively prevent the elastic arm 1460 from shifting due to vibration or external force during use, ensuring the stability and positioning accuracy of the elastic part 146; the cooperation between the limiting protrusion 1462 and the manhole cover body 40 increases the fixing points of the elastic arm 1460, further enhancing the stability of the elastic arm 1460, ensuring that the elastic protrusion 1461 can be firmly embedded in the limiting cavity 1442 when the manhole cover body 40 is closed; the structure of the limiting protrusion 1462 can... The vibration and loosening of the elastic arm 1460 are effectively reduced, ensuring that the manhole cover body 40 maintains a stable locked state during long-term use. The cooperation between the limiting protrusion 1462 and the elastic arm 1460 makes the manhole cover body 40 more secure in the closed state, further preventing accidental opening due to external forces and improving safety. The limiting protrusion 1462 increases the difficulty of opening the manhole cover body 40, effectively preventing unauthorized personnel from easily opening the manhole cover body 40 and improving the safety of the manhole cover body 40. The structure of the limiting protrusion 1462 allows the elastic arm 1460 to more accurately enter the limiting cavity 1442 when the manhole cover body 40 is closed, achieving automatic locking and simplifying the closing process of the manhole cover body 40.

[0036] Please refer to Figure 5 , Figure 7 and Figure 8 The manhole cover 10 also includes an alarm slot 15 on the manhole body 11, an installation slot 16 on the inner wall of the alarm slot 15, and an alarm element 17 in the installation slot 16. When the manhole cover body 40 is accidentally opened or illegally opened, the alarm element 17 will immediately sound an alarm to alert nearby personnel and the monitoring system, improving the safety of the manhole cover body 40. The alarm element 17 can sound an alarm when the manhole cover body 40 is not fully closed or is loose, promptly reminding maintenance personnel to inspect and repair it, preventing pedestrian and vehicle accidents caused by the manhole cover body 40 not being closed. The alarm element 17 can be connected to the monitoring system to monitor the status of the manhole cover body 40 in real time. Once a problem is detected, relevant departments can be notified immediately for handling, improving management efficiency. The alarm element 17 can record the number of times and the time of opening of the manhole cover body 40, facilitating analysis and management, and providing data support for maintenance and safety assessment. The presence of the alarm element 17 increases the difficulty of illegally opening the manhole cover body 40, playing a deterrent role and effectively preventing unauthorized personnel from opening the manhole cover body 40.

[0037] The alarm element 17 includes a second spring 173 disposed in the mounting groove 16, a sensing ball 171 mounted on the free end of the spring, and a buzzer 172 disposed in the well base 10 and electrically connected to the sensing ball 171. When the well cover body 40 is opened from the well base 10, the sensing ball 171 pops out from the mounting groove 16, at which time the sensing ball 171 activates the buzzer 172 in the well base 10. In this embodiment, when the well cover body 40 is opened from the well base 10 and the sensing ball 171 pops out from the mounting groove 16, only one-quarter of the sensing ball 171 is outside the mounting groove 16. When the manhole cover body 40 is opened from the manhole seat 10, the sensing ball 171 pops out from the mounting slot 16, immediately activating the buzzer 172 to sound an alarm, ensuring timely alarm when the manhole cover body 40 is not fully closed or is accidentally opened; the structure of the spring and sensing ball 171 ensures rapid alarm response, reducing alarm delay time and improving alarm timeliness; the alarm element 17 can sound an alarm when the manhole cover body 40 is not fully closed or is loose, alerting nearby personnel and monitoring systems, preventing pedestrian and vehicle accidents caused by the manhole cover body 40 not being closed; when the manhole cover body 40 is illegally opened, the buzzer 172 immediately sounds an alarm, increasing the difficulty of illegal opening and the risk of detection, effectively preventing unauthorized personnel from opening the manhole cover body 40; the structure of the spring and sensing ball 171 is simple and easy to install, and can be modified based on existing manhole cover bodies 40 and manhole seats 10 without complex electronic equipment; the mechanical structure reduces the use of electronic components, improves system reliability and stability, and reduces the failure rate.

[0038] Please refer to Figure 2 and Figure 3 The rotating assembly 50 includes a rotating roller 51 installed within the rotating shaft groove 12, on which the manhole cover body 40 is rotatably mounted. The structure of the rotating roller 51 makes the opening and closing of the manhole cover body 40 smoother, reducing the force required by the operator and making the opening and closing process easier. The rotating roller 51 reduces friction between the manhole cover body 40 and the rotating shaft groove 12, lowering resistance during opening and closing and improving operational convenience. The structure of the rotating roller 51 reduces direct contact between the manhole cover body 40 and the rotating shaft groove 12, reducing wear caused by friction and extending the service life of the manhole cover body 40. The material selection of the rotating roller 51 ensures good performance during long-term use, reducing damage caused by wear or fatigue and improving system reliability. The structure of the rotating roller 51 prevents accidental injury caused by jamming during opening and closing of the manhole cover body 40, improving operational safety. The stability and reliability of the rotating roller 51 ensure that the manhole cover body 40 will not be accidentally opened by external force when closed, improving the safety of the manhole cover body 40.

[0039] The rotating assembly 50 also includes an installation channel on the rotating roller 51 and a torsion spring 52 disposed on the installation channel. The torsion spring 52 provides a restoring force, enabling the manhole cover body 40 to automatically reset and close after being opened, reducing the need for operators to manually close the manhole cover body 40 and improving operational convenience. In scenarios where the manhole cover body 40 needs to be frequently opened and closed, the automatic reset function of the torsion spring 52 can prevent the manhole cover body 40 from being forgotten to close, improving safety. The torsion spring 52 can absorb the vibration and impact during the opening and closing process of the manhole cover, reducing the shaking of the manhole cover body 40 and ensuring that the manhole cover body 40 is more stable when closed. The stabilizing force provided by the torsion spring 52 can ensure that the manhole cover body 40 is accurately aligned when closed, preventing incomplete closure or loosening due to misalignment. The torsion spring 52 can provide a buffering force, making it easier to open and close the manhole cover body 40, reducing the physical exertion of operators and improving operational comfort. The structure of the torsion spring 52 can reduce the friction between the manhole cover body 40 and the rotating roller 51, making the opening and closing process smoother.

[0040] Please refer to Figure 1 , Figure 3 and Figure 5 The manhole cover fastening and locking mechanism also includes a hidden groove 80 provided on the manhole cover body 40, and a hand handle 90 rotatably installed in the hidden groove 80. The handle 90 is concealed inside the manhole cover body 40, reducing the possibility of unauthorized personnel easily finding and using it, thus improving the security of the manhole cover body 40. The structure of the handle 90 effectively prevents the use of external tools to open the manhole cover body 40, increasing the difficulty of illegal opening and improving the anti-pry capability of the manhole cover body 40. The handle 90 is rotatably installed within the concealed slot 80; when in use, simply pull out the handle for easy operation, making opening and closing the manhole cover body 40 easier. When not in use, the handle 90 can be hidden inside the manhole cover body 40, not occupying extra space and avoiding the space-consuming problem of traditional handles on the ground. The concealed structure reduces wear and corrosion from the external environment, extending the handle's lifespan. It also protects the handle from impacts from pedestrians and vehicles, reducing damage caused by external forces and improving system reliability. The concealed handle 90 structure makes the surface of the manhole cover body 40 more concise and aesthetically pleasing, preventing exposed handles from affecting the overall aesthetics of the city or area.

[0041] The above description merely illustrates the preferred technical solution of this utility model, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A manhole cover fastening and locking mechanism, characterized in that, The device includes a manhole base, a manhole cover body mounted on the manhole base for closing the manhole base, and a rotating assembly mounted on the manhole base for rotatably connecting the manhole base and the manhole cover body. The manhole base includes a manhole body, a rotating shaft groove and a locking groove on the manhole body, and a locking member on the locking groove. The rotating assembly is mounted on the rotating shaft groove. The locking member includes a horizontal channel on both sides of the locking groove, a locking part in the horizontal channel, a limiting ring at the free end of the horizontal channel for limiting the locking part, and a locking channel on the horizontal channel relative to the manhole cover body that cooperates with the locking part.

2. The manhole cover fastening and locking mechanism according to claim 1, characterized in that, The locking part includes a first spring installed in the horizontal channel and a locking ball installed at the free end of the first spring, with the other end of the locking ball abutting against the limiting ring.

3. The manhole cover fastening and locking mechanism according to claim 1, characterized in that, The locking component also includes a limiting part disposed on the inner wall of the well seat, a fixing part disposed on the bottom of the well cover body, and an elastic part disposed on the fixing part that cooperates with the limiting part.

4. The manhole cover fastening and locking mechanism according to claim 3, characterized in that, The limiting part is an upper convex ring, a lower convex ring, and a limiting cavity formed between the upper convex ring and the lower convex ring, which are disposed on the inner wall of the manhole cover body; the elastic part is an elastic arm installed on the fixed part and an elastic protrusion on the elastic arm that cooperates with the limiting cavity.

5. The manhole cover fastening and locking mechanism according to claim 4, characterized in that, The elastic part also includes a limiting protrusion disposed on the manhole cover body, the limiting protrusion being disposed opposite to the elastic arm.

6. The manhole cover fastening and locking mechanism according to claim 1, characterized in that, The well base also includes an alarm slot disposed on the well body, an installation slot disposed on the inner wall of the alarm slot, and an alarm component disposed in the installation slot.

7. The manhole cover fastening and locking mechanism according to claim 6, characterized in that, The alarm device includes a second spring disposed in the mounting groove, a sensing ball mounted on the free end of the second spring, and a buzzer disposed in the well seat and electrically connected to the sensing ball; when the well cover body is opened from the well seat, the sensing ball pops out from the mounting groove, at which time the sensing ball activates the buzzer in the well seat.

8. The manhole cover fastening and locking mechanism according to claim 1, characterized in that, The rotating assembly includes a rotating roller installed in the rotating shaft groove, and the manhole cover body is rotatably mounted on the rotating roller.

9. The manhole cover fastening and locking mechanism according to claim 8, characterized in that, The rotating assembly also includes an installation channel on the rotating roller and a torsion spring disposed on the installation channel.

10. The manhole cover fastening and locking mechanism according to claim 1, characterized in that, The manhole cover fastening and locking mechanism also includes a hidden groove provided on the manhole cover body and a hand handle rotatably installed in the hidden groove.

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