A municipal engineering water supply and drainage anti-theft well lid

Abstract

This invention discloses an anti-theft manhole cover for municipal engineering water supply and drainage, belonging to the field of municipal engineering technology. It includes a manhole base, a manhole cover body, a shock-absorbing rubber strip, a locking mechanism, and a concealed anti-theft unlocking component. The inner wall of the manhole base has a V-shaped groove, into which a shock-absorbing rubber strip with an internal buffer air chamber and anti-detachment ribs is embedded, significantly improving shock absorption, noise reduction, and self-cleaning performance through aerodynamic effects. The locking mechanism is located at the bottom of the manhole cover. Its pressure-bearing transmission component, when subjected to vertical vehicle loads, converts downward pressure into horizontal thrust, forcing the locking tongue to engage in the locking hole of the manhole base, preventing the manhole cover from eccentric jumping and circumferential rotation. The anti-theft unlocking component uses a concealed rotating rod with a dustproof camouflage cover to retract the linkage cable, pulling the locking tongue back to achieve manual unlocking. This achieves the linkage of adaptive locking, pneumatic buffering, and mechanical anti-theft, thereby eliminating the "road trap" hazard and extending the component's lifespan.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of municipal engineering, more particularly to a theftproof well cover for municipal engineering water supply and drainage. BACKGROUND

[0002] With the acceleration of urbanization and the increasing of urban road traffic load, the operation state of the municipal inspection well cover, as the hub facility connecting the underground pipe network and the ground traffic, is directly related to the road traffic safety and urban living environment. However, the structural design defects of the widely used traditional municipal well cover are gradually exposed in practical application, which has been difficult to meet the bearing demand of modern high-intensity traffic flow.

[0003] In the prior art, a non-constrained lap joint structure is usually used between the traditional well cover and the well seat. This simple socket or flat lap design has the following significant technical defects:

[0004] When dealing with modern high-frequency and heavy-load traffic flow, the traditional cast iron well cover is prone to axial tilting and radial jumping in the well seat due to the lack of effective mechanical locking, radial constraint and flexible buffer structure when the wheel rolls over the edge, which is caused by the eccentric load effect (lever force). This unstable state of breaking the force balance leads to frequent rigid friction and violent impact between the matching surfaces, which causes serious fatigue wear and irreversible plastic deformation under the action of long-term alternating stress, and then falls into a vicious cycle of "the more loose, the more impact, the more impact, the more wear", which greatly shortens the service life of the component. In addition, this high-frequency rigid impact not only produces high-decibel noise that seriously disturbs the public, but also causes displacement, overturning and even damage and falling of the well cover under the high-speed rolling of the vehicle due to long-term structural vibration and wear, which eventually evolves into a "road trap" that seriously threatens the life and property safety of pedestrians and vehicles.

[0005] Therefore, a theftproof well cover for municipal engineering water supply and drainage is proposed. SUMMARY

[0006] In view of the problems in the prior art, the purpose of the present application is to provide a theftproof well cover for municipal engineering water supply and drainage, which can improve the safety of the well cover.

[0007] To solve the above problems, the present application adopts the following technical scheme.

[0008] A theftproof well cover for municipal engineering water supply and drainage, comprising a well seat and a well cover body;

[0009] It also comprises an annular shock-absorbing rubber strip, a locking mechanism and a concealed theftproof unlocking assembly;

[0010] The inner wall of the well seat is processed with a V-shaped ring groove which is downward inclined and the inner diameter gradually decreases from top to bottom, and the shock-absorbing rubber strip is embedded in the inner surface of the V-shaped ring groove;

[0011] The inner wall of the manhole cover has a circular groove at the bottom of the V-shaped groove, and the top end face of the circular groove forms an annular support platform to provide vertical support for the manhole cover body.

[0012] The locking mechanism is located at the bottom of the manhole cover body and includes a pressure-bearing transmission component and a locking tongue that cooperates with it and extends horizontally outward;

[0013] The concealed anti-theft unlocking component is located on the manhole cover body and includes a linkage cable that can move the locking tongue.

[0014] Furthermore, the locking mechanism also includes a lock hole opened in the inner wall of the well seat;

[0015] A mounting bracket is fixedly installed at the bottom of the manhole cover body, and a guide rod is horizontally fixedly installed on the side wall of the mounting bracket. The locking tongue is slidably sleeved on the guide rod.

[0016] The pressure-driven transmission assembly includes an elastic element fixedly installed between the end of the latch away from the lock hole and the inner wall of the mounting bracket. Under the elastic force of the elastic element, the latch extends outward and inserts into the lock hole.

[0017] Furthermore, the concealed anti-theft unlocking component also includes an operating hole that is vertically opened through the manhole cover body, in which a rotating rod is rotatably installed;

[0018] The linkage cable is located in the space below the manhole cover body, with one end fixed to the outer wall of the rotating rod and the other end fixedly connected to the locking tongue.

[0019] Furthermore, a camouflage protective cover is provided at the top opening of the operating hole, with the upper surface of the camouflage protective cover flush with the upper surface of the manhole cover body; and the camouflage protective cover is detachably snapped into the inner wall of the operating hole; the detachable snap-fit ​​structure also greatly facilitates the daily unlocking and maintenance operations of municipal personnel.

[0020] Furthermore, an annular positioning groove is provided on the inner wall of the V-shaped groove, and a fixing rib that matches the annular positioning groove is integrally formed on the outer wall of the shock-absorbing rubber strip.

[0021] Furthermore, the pressure-bearing transmission assembly also includes a linkage blind hole opened on the bottom surface of the locking tongue;

[0022] A guide push rod is vertically fixed on the inner wall of the well base, and the top of the guide push rod is machined with a guide slope that slides with the inner wall of the linkage blind hole.

[0023] Furthermore, a dustproof baffle is slidably installed inside the keyhole, and the outer peripheral sidewall of the dustproof baffle is slidably fitted with the inner sidewall of the keyhole;

[0024] An elastic strip is fixedly connected between the dustproof baffle and the bottom end face of the lock hole, and the elastic coefficient of the elastic element at the end of the lock tongue is greater than the elastic coefficient of the elastic strip.

[0025] Furthermore, the shock-absorbing rubber strip is made of EPDM rubber, and it has an annular buffer air cavity opened in the circumferential direction inside.

[0026] Furthermore, a one-way exhaust hole communicating with the buffer air chamber is opened on the side wall of the shock-absorbing rubber strip near the manhole cover body; a one-way air inlet valve is embedded on the inner wall of the manhole seat, and the output end of the one-way air inlet valve is connected to the buffer air chamber.

[0027] Furthermore, a non-standard polygonal anti-theft groove is provided on the top end face of the rotating rod.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) This solution combines the shock-absorbing rubber strip in the V-shaped ring groove with the locking tongue mechanism at the bottom to transform the rigid impact of vehicle rolling into elastic compression, absorb high-frequency vibration and eliminate noise; at the same time, relying on the mechanical limiting effect of the locking tongue and the locking hole, the axial lifting and circumferential rotation freedom of the manhole cover under heavy pressure are completely locked, eliminating the hidden danger of "road trap" caused by off-center load, thereby reducing friction and wear between mating surfaces and extending the life of the components.

[0030] (2) This solution utilizes the inclined surface of the guide push rod in the pressure transmission assembly to cooperate with the linkage blind hole. When the manhole cover is subjected to heavy downward pressure from a vehicle, the small vertical displacement is converted into a horizontal thrust, which forces the locking tongue to make a small lateral movement. This adaptive dynamic feedback can not only strengthen the locking under heavy load, but also prevent the locking tongue from being jammed due to long-term static conditions caused by mud and sand accumulation or rust, thus enhancing the long-term reliability of the system.

[0031] (3) In view of the harsh mud and sand environment in the well, this solution adds a linkage dustproof baffle inside the lock hole and a flat camouflage protective cover on the top of the rotating operation hole, cutting off the path of mud, sand and gravel to enter the core transmission mechanism and ensuring smooth transmission; combined with the concealed anti-theft rotating rod and linkage cable design, it can not only prevent unauthorized personnel from opening illegally, but also facilitate the daily unlocking and inspection by municipal maintenance personnel.

[0032] (4) The shock-absorbing rubber strip of this solution is designed with a buffer air chamber, a one-way exhaust port and a one-way air inlet valve. When under pressure, it plays the role of an "air spring" to convert the instantaneous rigid impact into air pressure potential energy dissipation and avoid high stress cracking of the rubber. At the same time, the high-speed airflow ejected when the air chamber contracts accurately blows away the hard particles attached to the joint of the well cover body. When resetting, negative pressure is replenished to form a self-cleaning cycle, which plays a role in reducing wear and ensuring long-term shock absorption effect. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the manhole cover body of the present invention;

[0034] Figure 2 This is a schematic cross-sectional view of the combined structure of the manhole cover body and the manhole seat of the present invention;

[0035] Figure 3 This is a schematic cross-sectional view of the combination of the shock-absorbing rubber strip and the manhole cover body of the present invention;

[0036] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point A;

[0037] Figure 5 This is a schematic diagram of the combined structure of the rotating rod and the anti-theft groove of the present invention;

[0038] Figure 6 This is a schematic diagram of the combined structure of the shock-absorbing rubber strip and the fixing rib of the present invention;

[0039] Figure 7 This is a schematic diagram of the combined structure of the guide push rod and the linkage blind hole of the present invention.

[0040] Explanation of the labels in the diagram:

[0041] 1. Manhole base; 2. Manhole cover body; 3. Shock-absorbing rubber strip; 4. Locking tongue; 5. Linkage cable; 6. Lock hole; 7. Mounting bracket; 8. Guide rod; 9. Elastic element; 10. Rotating rod; 11. Camouflage protective cover; 1101. Insertion hole; 1102. Locking hole; 1103. Mounting hole; 1104. Elastic block; 12. Fixing rib; 13. Linkage blind hole; 14. Guide push rod; 15. Dustproof baffle; 16. Elastic strip; 17. Buffer air chamber; 18. One-way exhaust port; 19. One-way air inlet valve; 20. Anti-theft irregular groove. Detailed Implementation

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

[0043] Example 1:

[0044] Please see Figures 1 to 7 A type of anti-theft manhole cover for municipal engineering water supply and drainage, comprising a manhole base 1 and a manhole cover body 2;

[0045] It also includes a ring-shaped shock-absorbing rubber strip 3, a locking mechanism, and a concealed anti-theft unlocking component;

[0046] The inner wall of the well base 1 is machined with a downwardly inclined V-shaped annular groove whose inner diameter gradually decreases from top to bottom, and the shock-absorbing rubber strip 3 is embedded in the inner surface of the V-shaped annular groove;

[0047] The inner wall of the manhole cover 1 has a circular groove at the bottom of the V-shaped groove, and the top end face of the circular groove forms an annular support platform for providing vertical support for the manhole cover body 2.

[0048] The locking mechanism is located at the bottom of the manhole cover body 2 and includes a pressure-bearing transmission component and a locking tongue 4 that cooperates with it and extends horizontally outward;

[0049] The concealed anti-theft unlocking component is located on the manhole cover body 2 and includes a linkage cable 5 that can move the locking tongue 4.

[0050] The locking mechanism also includes a lock hole 6 opened on the inner wall of the well base 1;

[0051] A mounting bracket 7 is fixedly installed at the bottom of the manhole cover body 2, and a guide rod 8 is horizontally fixedly installed on the side wall of the mounting bracket 7. The locking tongue 4 is slidably sleeved on the guide rod 8.

[0052] The pressure-driven transmission assembly includes an elastic element 9 fixedly installed between the end of the latch 4 away from the lock hole 6 and the inner wall of the mounting bracket 7. Under the elastic force of the elastic element 9, the latch 4 extends outward and is inserted into the lock hole 6.

[0053] The concealed anti-theft unlocking component also includes an operating hole that is vertically opened through the manhole cover body 2, in which a rotating rod 10 is rotatably installed;

[0054] The linkage cable 5 is located in the space below the manhole cover body 2, with one end fixed to the outer wall of the rotating rod 10 and the other end fixedly connected to the locking tongue 4.

[0055] When the manhole cover is under pressure, gravity and impact force act on the damping strip 3 first, transforming the rigid impact of "iron hitting iron" into the elastic compression of the damping strip 3, thereby absorbing vibration loads at all times, eliminating high-decibel noise, and avoiding fatigue wear and plastic deformation between cast iron mating surfaces.

[0056] When the locking tongue 4 is inserted into the locking hole 6, the mechanical limiting effect of the side wall of the locking hole 6 can not only effectively counteract the axial runout of the manhole cover caused by the vehicle's uneven load, but also lock the circumferential rotational freedom of the circular manhole cover body 2 in the manhole seat 1, thereby reducing the friction and wear between the mating surfaces of the manhole cover body 2 and the manhole seat 1, and playing a role in improving road traffic safety and extending the service life of the shock-absorbing rubber strip 3.

[0057] Under normal conditions, when the elastic element 9 pushes the locking tongue 4 outward and inserts it into the lock hole 6, the linkage cable 5 is naturally pulled and hangs slightly downward; and in this state, the lowest point of the linkage cable 5 is always above the bottom of the rotating rod 10.

[0058] When the manhole cover needs to be opened, the operator rotates the rotating rod 10, causing the linkage cable 5 to continuously wind around the outer surface of the rotating rod 10. As the cable contracts, the resulting tension forces the locking tongue 4 to overcome the elastic force of the elastic element 9 and retract inward and exit the locking hole 6, thereby releasing the locking state and allowing maintenance personnel to easily remove the manhole cover body 2 from the manhole seat 1.

[0059] like Figure 4 As shown, a camouflage protective cover 11 is provided at the top opening of the operating hole. The upper surface of the camouflage protective cover 11 is flush with the upper surface of the manhole cover body 2, which can prevent the fitting gap between the rotating rod 10 and the operating hole from being directly exposed to the outside, blocking the intrusion path of impurities such as mud, sand and gravel, preventing the rotating rod 10 from getting stuck, and ensuring the long-term smooth operation of the rotating rod 10. In addition, the camouflage protective cover 11 and the inner wall of the operating hole are detachably snapped together. The detachable snap-fit ​​structure also greatly facilitates the daily unlocking and maintenance operations of municipal personnel.

[0060] The manhole cover body 2 has an insertion hole 1101 on its top wall, which is concentrically connected to the operating hole, and the inner diameter of the insertion hole 1101 is larger than the inner diameter of the operating hole. The camouflage cover 11 is a hollow structure with an open bottom, and its outer diameter is adapted to the inner diameter of the insertion hole 1101. In addition, a locking hole 1102 is provided on the inner side wall of the insertion hole 1101, and a corresponding mounting hole 1103 is provided on the side wall of the camouflage cover 11. A hollow elastic block 1104 is fixedly embedded in the mounting hole 1103.

[0061] Under normal conditions, the elastic block 1104 protrudes partially from the mounting hole 1103. When the camouflage cover 11 is pressed down into the insertion hole 1101, the inner wall of the insertion hole 1101 will squeeze the elastic block 1104, causing it to undergo elastic deformation and retract into the mounting hole 1103, thereby ensuring that the camouflage cover 11 is smoothly inserted.

[0062] When the camouflage cover 11 is fully inserted and the elastic block 1104 is aligned with the locking hole 1102, the elastic block 1104 loses the inner wall compression and instantly recovers its elasticity, protruding into the interior of the locking hole 1102. The mechanical limiting contact between the elastic block 1104 and the side wall of the locking hole 1102 ensures a stable lock on the camouflage cover 11, preventing it from accidentally falling off during vehicle vibrations.

[0063] like Figure 3 , Figure 6As shown, an annular positioning groove is provided on the inner wall of the V-shaped groove, and a fixing rib 12 that matches the annular positioning groove is integrally formed on the outer wall of the shock-absorbing rubber strip 3.

[0064] The fixed rib 12 is interference-fitted into the annular positioning groove. Relying on the mechanical limiting effect of the side wall of the annular positioning groove, it can prevent the shock-absorbing rubber strip 3 from flipping or falling off under long-term alternating force, thus further ensuring the structural stability of the manhole cover assembly.

[0065] like Figure 3 , Figure 7 As shown, the pressure-bearing transmission assembly also includes a linkage blind hole 13 opened on the bottom surface of the locking tongue 4;

[0066] A guide push rod 14 is vertically fixedly installed on the inner wall of the well base 1, directly below the locking tongue 4. The top of the guide push rod 14 is machined with a guide slope that slides with the inner wall of the linkage blind hole 13.

[0067] The ratio of the vertical height of the locking tongue 4 to the vertical height of the locking hole 6 is 0.6-0.9, thus reserving clearance space for the locking tongue 4 inside the locking hole 6 to allow the manhole cover body 2 to move downwards;

[0068] When the manhole cover body 2 is pressed, the buffer pad is squeezed and undergoes elastic deformation downward. At this time, the manhole cover body 2 drives the locking tongue 4 to move down synchronously within the clearance space of the locking hole 6.

[0069] During the downward movement, the guide push rod 14 remains stationary. The guide slope at its top slides against the inner wall of the linkage blind hole 13 and generates a squeezing force. This force can convert the downward displacement into a lateral force, causing the locking tongue 4 to move slightly outward.

[0070] Therefore, whenever the manhole cover body 2 is subjected to vehicle pressure, it can drive the locking tongue 4 to produce a lateral "breathing micro-movement", thereby effectively preventing the locking tongue 4 from being stuck due to mud and sand accumulation or rust due to being in a static state for a long time.

[0071] like Figure 3 As shown, a dustproof baffle 15 is slidably disposed inside the lock hole 6, and the outer peripheral sidewall of the dustproof baffle 15 is slidably attached to the inner sidewall of the lock hole 6.

[0072] An elastic strip 16 is fixedly connected between the dustproof baffle 15 and the bottom end face of the lock hole 6, and the elastic coefficient of the elastic element 9 at the end of the lock tongue 4 is greater than the elastic coefficient of the elastic strip 16.

[0073] When the bolt 4 is not inserted into the lock hole 6, under the elastic force of the elastic strip 16, the dust baffle 15 is pushed outward to the open end of the lock hole 6 and blocks the lock hole 6, thereby blocking the path of impurities such as mud, sand and gravel into the lock hole 6, ensuring the cleanliness of the lock hole 6 and ensuring that the bolt 4 can be smoothly inserted later; when the bolt 4 extends outward and inserts into the lock hole 6, because the elastic force of the elastic element 9 is greater than the elastic force of the elastic strip 16, the bolt 4 can overcome the resistance of the elastic strip 16 and forcibly push the dust baffle 15 into the depth of the lock hole 6, thereby ensuring the normal completion of the locking action.

[0074] like Figure 3 As shown, the material of the shock-absorbing rubber strip 3 is EPDM rubber, and an annular buffer air cavity 17 is provided in its interior along the circumference. The buffer air cavity 17 provides sufficient space for the shock-absorbing rubber strip 3 to deform under pressure within the confined V-shaped groove, thereby overcoming the "stress hardening" phenomenon that is easily generated by solid rubber. Moreover, the air inside the air cavity can play the flexible energy absorption role of an "air spring" when subjected to the instantaneous high-frequency impact of the vehicle.

[0075] The shock-absorbing rubber strip 3 has a one-way exhaust hole 18 on the side wall near the manhole cover body 2, which communicates with the buffer air chamber 17; a one-way air inlet valve 19 is embedded on the inner wall of the manhole seat 1, and the output end of the one-way air inlet valve 19 is connected to the buffer air chamber 17.

[0076] When a vehicle runs over the manhole cover body 2, causing the shock-absorbing rubber strip 3 to be compressed, the buffer air chamber 17 contracts under pressure. The gas inside the chamber is forced out at high speed from the one-way exhaust port 18. The airflow precisely passes through the mating gap between the shock-absorbing rubber strip 3 and the manhole cover body 2, thereby forcefully blowing away mud, sand, impurities, and other particles attached to the gap. When the vehicle leaves and the shock-absorbing rubber strip 3 elastically returns to its original position, the one-way exhaust port 18 closes to prevent sewage backflow, and a negative pressure is generated inside the buffer air chamber 17. Gas is then replenished from below the manhole seat 1 through the one-way air intake valve 19. This "pneumatic self-cleaning" cycle can reduce the wear of hard particles on the shock-absorbing rubber strip 3 during the vibration of the manhole cover, thereby extending the service life of the shock-absorbing rubber strip 3 and ensuring its long-term shock absorption effect.

[0077] Combined with the airflow throttling and damping effect generated by the exhaust port, the instantaneous rigid impact kinetic energy can be converted into air pressure potential energy and dissipated, thereby improving the impact buffering performance of the shock-absorbing rubber strip 3, thus playing a role in noise reduction and soundproofing, while avoiding cracking and damage of the rubber strip caused by high stress concentration.

[0078] like Figure 5 As shown, a non-standard polygonal anti-theft groove 20 is provided on the top end face of the rotating rod 10. It is used to cooperate with the insertion of a special non-standard key tool to drive the rotating rod 10 to rotate, preventing unauthorized personnel from opening it with conventional tools, thus ensuring security during normal use.

[0079] The one-way exhaust port 18 is tapered outwards until it is completely closed. Because the shock-absorbing rubber strip 3 is elastic, once the air pressure in the buffer air chamber 17 rises, the end of the one-way exhaust port 18 will be pushed open by the internal air pressure, thereby venting the gas.

[0080] Instructions for use: When the manhole cover is under pressure, gravity and impact force first act on the damping strip 3, converting the rigid impact of "iron against iron" into elastic compression of the damping strip 3. This effectively absorbs vibration loads at all times, eliminates high-decibel noise, and prevents fatigue wear and plastic deformation between the cast iron mating surfaces.

[0081] When the locking tongue 4 is inserted into the locking hole 6, the mechanical limiting effect of the side wall of the locking hole 6 can not only effectively counteract the axial runout of the manhole cover caused by the vehicle's uneven load, but also lock the circumferential rotational freedom of the circular manhole cover body 2 within the manhole seat 1. This reduces the friction and wear between the mating surfaces of the manhole cover body 2 and the manhole seat 1, thereby improving road traffic safety and extending the service life of the shock-absorbing rubber strip 3.

[0082] Under normal conditions, when the elastic element 9 pushes the locking tongue 4 outward and inserts it into the lock hole 6, the linkage cable 5 is naturally pulled and hangs slightly downward; and in this state, the lowest point of the linkage cable 5 is always above the bottom of the rotating rod 10.

[0083] When the manhole cover needs to be opened, the operator rotates the rotating rod 10, causing the linkage cable 5 to continuously wind around the outer surface of the rotating rod 10. As the cable contracts, the resulting tension forces the locking tongue 4 to overcome the elastic force of the elastic element 9 and retract inward and exit the locking hole 6, thereby releasing the locking state and allowing maintenance personnel to easily remove the manhole cover body 2 from the manhole seat 1.

[0084] When the manhole cover body 2 is pressed, the buffer pad is squeezed and undergoes elastic deformation downward. At this time, the manhole cover body 2 drives the locking tongue 4 to move down synchronously within the clearance space of the locking hole 6.

[0085] During the downward movement, the guide push rod 14 remains stationary. The guide slope at its top slides against the inner wall of the linkage blind hole 13 and generates a squeezing force. This force can convert the downward displacement into a lateral force, causing the locking tongue 4 to move slightly outward.

[0086] Therefore, whenever the manhole cover body 2 is subjected to vehicle pressure, it can drive the locking tongue 4 to produce a lateral "breathing micro-movement", thereby effectively preventing the locking tongue 4 from being stuck due to mud and sand accumulation or rust due to being in a static state for a long time.

[0087] When a vehicle runs over the manhole cover body 2, causing the shock-absorbing rubber strip 3 to be compressed, the buffer air chamber 17 contracts under pressure. The gas inside the chamber is forced out at high speed from the one-way exhaust port 18. The airflow precisely passes through the mating gap between the shock-absorbing rubber strip 3 and the manhole cover body 2, thereby forcefully blowing away mud, sand, impurities, and other particles attached to the gap. When the vehicle leaves and the shock-absorbing rubber strip 3 elastically returns to its original position, the one-way exhaust port 18 closes to prevent sewage backflow, and a negative pressure is generated inside the buffer air chamber 17. Gas is then replenished from below the manhole seat 1 through the one-way air intake valve 19. This "pneumatic self-cleaning" cycle can reduce the wear of hard particles on the shock-absorbing rubber strip 3 during the vibration of the manhole cover, thereby extending the service life of the shock-absorbing rubber strip 3 and ensuring its long-term shock absorption effect.

[0088] Combined with the airflow throttling and damping effect generated by the exhaust port, the instantaneous rigid impact kinetic energy can be converted into air pressure potential energy and dissipated, thereby improving the impact buffering performance of the shock-absorbing rubber strip 3, thus playing a role in noise reduction and soundproofing, while avoiding cracking and damage of the rubber strip caused by high stress concentration.

[0089] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A burglarproof manhole cover for water supply and drainage in municipal engineering, comprising a manhole base (1) and a manhole cover body (2); Its features are: It also includes a ring-shaped shock-absorbing rubber strip (3), a locking mechanism, and a concealed anti-theft unlocking component; The inner wall of the well base (1) is machined with a V-shaped annular groove that slopes downward and gradually decreases in inner diameter from top to bottom. The shock-absorbing rubber strip (3) is embedded in the inner surface of the V-shaped annular groove. The inside of the shock-absorbing rubber strip (3) is provided with an annular buffer air chamber (17) along the circumferential direction. The shock-absorbing rubber strip (3) has a one-way exhaust hole (18) on the side wall near the manhole cover body (2) that communicates with the buffer air chamber (17). The inner wall of the well seat (1) is provided with a circular groove at the bottom end of the V-shaped groove, and the top end face of the circular groove forms an annular support platform for providing vertical support for the well cover body (2). The locking mechanism is located at the bottom of the manhole cover body (2) and includes a pressure-driven transmission component and a locking tongue (4) that cooperates with it and extends horizontally outward. The pressure-driven transmission assembly includes a linkage blind hole (13) opened on the bottom surface of the latch (4). The concealed anti-theft unlocking component is located on the manhole cover body (2) and includes a linkage cable (5) that can move the locking tongue (4).

2. The anti-theft manhole cover for municipal engineering water supply and drainage as described in claim 1, characterized in that: The locking mechanism also includes a lock hole (6) opened on the inner wall of the well base (1). The bottom of the manhole cover body (2) is fixedly installed with an installation frame (7), and a guide rod (8) is horizontally fixedly installed on the side wall of the installation frame (7). The locking tongue (4) is slidably sleeved on the guide rod (8). The pressure transmission assembly includes an elastic element (9) fixedly installed between the end of the latch (4) away from the lock hole (6) and the inner wall of the mounting bracket (7). The latch (4) extends outward under the elastic force of the elastic element (9) and is inserted into the lock hole (6).

3. The anti-theft manhole cover for municipal engineering water supply and drainage according to claim 2, characterized in that: The concealed anti-theft unlocking component also includes an operating hole that is vertically opened through the manhole cover body (2), and a rotating rod (10) is rotatably installed in the operating hole. The linkage cable (5) is located in the space below the manhole cover body (2), with one end fixed to the outer wall of the rotating rod (10) and the other end fixedly connected to the locking tongue (4).

4. The anti-theft manhole cover for municipal engineering water supply and drainage as described in claim 3, characterized in that: A camouflage cover (11) is provided at the top opening of the operating hole. The upper surface of the camouflage cover (11) is flush with the upper surface of the well cover body (2). The camouflage cover (11) is detachably snapped into the inner wall of the operating hole.

5. The anti-theft manhole cover for municipal engineering water supply and drainage according to claim 4, characterized in that: The inner wall of the V-shaped groove is provided with an annular positioning groove, and the outer wall of the shock-absorbing rubber strip (3) is integrally formed with a fixing rib (12) that matches the annular positioning groove.

6. The anti-theft manhole cover for water supply and drainage in municipal engineering according to claim 5, characterized in that: A guide push rod (14) is vertically fixed on the inner wall of the well base (1), and the top end of the guide push rod (14) is machined with a guide slope that slides with the inner wall of the linkage blind hole (13).

7. The anti-theft manhole cover for municipal engineering water supply and drainage according to claim 2, characterized in that: A dustproof baffle (15) is slidably provided inside the lock hole (6), and the outer peripheral sidewall of the dustproof baffle (15) is slidably attached to the inner sidewall of the lock hole (6). An elastic strip (16) is fixedly connected between the dustproof baffle (15) and the bottom end face of the lock hole (6), and the elastic coefficient of the elastic element (9) at the end of the lock tongue (4) is greater than the elastic coefficient of the elastic strip (16).

8. The anti-theft manhole cover for water supply and drainage in municipal engineering according to claim 1, characterized in that: The material of the shock-absorbing rubber strip (3) is EPDM rubber.

9. A burglarproof manhole cover for municipal engineering water supply and drainage according to claim 8, characterized in that: The inner wall of the well base (1) is fitted with a one-way air inlet valve (19), the output end of which is connected to the buffer air chamber (17).

10. A burglarproof manhole cover for municipal engineering water supply and drainage according to claim 3, characterized in that: The top end face of the rotating rod (10) is provided with a non-standard polygonal anti-theft groove (20).

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