Anti-theft inspection well cover

Abstract

The invention relates to the technical field of mechanical engineering, in particular to an anti-theft inspection well lid which is characterized in that a key hole is formed in the top of an inspection well lid body, an annular support is arranged at the bottom of the inspection well lid body, a locking block connecting rod is arranged in the middle of the annular support, and a well lid locking block is arranged at the end of the locking block connecting rod; a well lid limiting mechanism is arranged in the middle of the well lid limiting mechanism notch, a delimiting block is arranged in the middle of the delimiting block notch, a well lid replacement ring frame is arranged on the circumferential side face of the inspection well lid body, a fixing notch is formed in the outer side of the well lid replacement ring frame, an unlocking block is arranged in the fixing notch, and a movable locking plate is arranged at the bottom of the unlocking block. An inspection well cover installation frame is arranged on the periphery of the well lid replacement ring frame, installation frame fixing holes are formed in the side face of the inspection well cover installation frame, installation frame limiting grooves are formed in the inner side of the inspection well cover installation frame, an unlocking rotary knob is arranged at the top of the well lid key, a key base is arranged at the bottom of the well lid key, and an unlocking linkage block is arranged at the top of the key base.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical engineering, and more particularly to an anti-theft manhole cover. Background Art

[0002] Manhole covers are common in urban construction. They are important channels for inspecting and maintaining underground pipelines, and play an important role in maintaining smooth and long-term operation of the system.

[0003] The manhole cover is mainly composed of the manhole cover body, the manhole cover installation bracket, the locking anti-theft component and other auxiliary components. The installation bracket ensures the stability of the manhole cover body installation and fixes the manhole cover body to prevent the manhole cover from being stolen. The locking anti-theft component is a particularly important component, which ensures the normal opening and locking of the manhole cover. Other auxiliary components ensure the normal operation of the manhole cover system. However, the above structure still has the following deficiencies: 1. The locking structure of the existing manhole cover is only a card slot type after the manhole cover is locked, and it will become loose over time. If the manhole cover is locked in all directions, a more complicated locking anti-theft mechanism is required, which not only increases the equipment cost, but also 1. It increases the number of unlocking steps and significantly reduces the efficiency of daily maintenance; 2. The existing mounting bracket is rigidly fixed to the ground. When the manhole cover is damaged and needs to be replaced, destructive operations such as chiseling and excavation are required on the solidified ground foundation. Not only is the construction period long, but it is also accompanied by high secondary repair costs and difficulty in road restoration, resulting in multiple wastes of manpower, material and time resources; 3. Traditional mechanical locks have obvious security loopholes due to their simple technical principles. Criminals can quickly crack them through low-cost means such as brute force prying and tool imitation, and the keyhole is easily affected by environmental factors such as mud, sand and corrosion, leading to mechanical failure, making it difficult to meet the high security requirements of modern urban infrastructure. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an anti-theft manhole cover to solve the problems existing in the above-mentioned background technology.

[0005] The present invention provides the following technical solution: an anti-theft manhole cover, wherein the top of the manhole cover body is provided with the keyhole, the bottom of the manhole cover body is provided with a driving gear, the bottom of the manhole cover body is provided with a driven gear, the bottom of the manhole cover body is provided with an annular bracket, the middle of the annular bracket is provided with the locking block connecting rod, the end of the locking block connecting rod is provided with the manhole cover locking block, the middle of the manhole cover locking block is provided with the manhole cover limiting mechanism notch and the release block notch, the middle of the manhole cover limiting mechanism notch is provided with the manhole cover limiting mechanism, the middle of the release block notch is provided with the release block, and the circumferential side of the manhole cover body is provided with The manhole cover replacement ring frame is provided, the outer side of the manhole cover replacement ring frame is provided with the fixing slot, the unlocking block is provided inside the fixing slot, the movable locking plate is provided at the bottom of the unlocking block, the periphery of the manhole cover replacement ring frame is provided with the manhole cover mounting frame, the side of the manhole cover mounting frame is provided with the mounting frame fixing hole, the side of the manhole cover mounting frame is fixedly connected to the mounting frame support plate, the inner side of the manhole cover mounting frame is provided with the mounting frame limiting groove, the top of the manhole cover key is provided with the unlocking knob, the bottom of the manhole cover key is provided with the key base, and the top of the key base is provided with the unlocking linkage block.

[0006] Furthermore, the top of the manhole cover body is provided with the cover opening hole and the drainage hole. There are fifteen drainage holes arranged in a circle, and the two cover opening holes are symmetrically arranged. The key guide hole is provided in the middle of the driving gear, the key fixing slot is provided at the top of the driving gear, the key limiting plate is provided at the bottom of the driving gear, and there are four locking block connecting rods.

[0007] The lock hole is fixed with the locking plate, and the locking plate is fixed with the locking spring on the locking plate, and the locking plate is fixed with the locking plate on the locking plate.

[0008] Furthermore, the four mounting frame limiting grooves are evenly arranged on the inner side of the manhole cover mounting frame, the mounting frame limiting blocks are fixedly connected to the side surfaces of the mounting frame limiting grooves, and the four mounting frame limiting blocks are closely arranged.

[0009] Furthermore, the four manhole cover locking blocks are evenly arranged at the bottom of the manhole cover body, the manhole cover limiting mechanism guide groove is opened inside the manhole cover limiting mechanism slot, the inner side of the release block slot is opened with the release block guide groove, there are two release block guide grooves, the side of the release block slot is fixedly connected with the release block spring, the end of the release block spring is provided with the release block, the long side of the release block is fixedly connected with the first locking tongue, and the short side of the release block is fixedly connected with the release block guide block.

[0010] Furthermore, the bottom of the manhole cover limiting mechanism slot is provided with the manhole cover limiting mechanism return spring base, the top of the manhole cover limiting mechanism return spring base is provided with the manhole cover limiting block return spring, four manhole cover limiting block return springs are evenly fixedly connected to the bottom of the manhole cover limiting mechanism, the side of the manhole cover limiting mechanism is provided with the manhole cover limiting mechanism guide block, the top of the manhole cover limiting mechanism is fixedly connected with the manhole cover limiting block, the top of the manhole cover limiting mechanism is provided with the linkage block slot, the side of the linkage block slot is provided with the linkage block guide groove, two linkage block guide grooves are symmetrically arranged on the side of the linkage block slot, the short side of the manhole cover limiting mechanism is provided with the linkage block spring, the end face of the linkage block spring is fixedly connected with the second lock tongue, and the side of the second lock tongue is fixedly connected with the linkage block guide block.

[0011] Furthermore, the handle is provided at the top of the manhole cover key, the unlocking link is provided inside the manhole cover key, the unlocking link is fixedly connected to the bottom of the unlocking knob, the bottom of the unlocking link is fixedly connected to the unlocking linkage base, the bottom of the manhole cover key is provided with the key base, the top of the key base is provided with the unlocking linkage block slot, the side of the unlocking linkage block slot is provided with the unlocking linkage block guide groove, the upper part of the unlocking linkage block slot is provided with the unlocking linkage block, the side of the unlocking linkage block is provided with the linkage arm connected to the unlocking linkage base, and the side of the unlocking linkage block is fixedly connected to the unlocking linkage block guide block.

[0012] Furthermore, four unlocking linkage block notches are arranged circumferentially on the top of the key base, there are four unlocking linkage blocks, and there are four linkage arms.

[0013] Technical effects and advantages of the present invention:

[0014] The present invention provides a manhole cover limiting mechanism and a release block inside the manhole cover locking block. Combined with the rotation of the manhole cover locking block, the manhole cover limiting mechanism is locked and unlocked. When the manhole cover locking block is rotated to unlock, the release block extends under the action of the release block spring. At the same time, the manhole cover limiting mechanism moves downward under the action of the side slope of the manhole cover. The movable linkage block provided inside the manhole cover limiting mechanism works together with the first lock tongue on the side of the release block, thereby locking the manhole cover limiting mechanism. When the release block moves toward the inside of the manhole cover locking block, the first lock tongue is separated from the second lock tongue by the transverse movement of the first lock tongue, thereby automatically unlocking the manhole cover limiting mechanism. The operation process is significantly simplified. Only a single rotation operation is required to trigger the entire linkage mechanism to complete the unlocking or locking action. This greatly improves the convenience and efficiency of installing and removing the manhole cover, and effectively reduces manual operation costs and time costs.

[0015] 2. Mechanical interlocking ensures reliable fixation and convenient unlocking of the manhole cover replacement ring. A mounting frame limit slot, located inside the manhole cover mounting frame, houses a mounting frame limit block. These block and locking block work together to form a secure mechanical constraint, effectively resisting external forces and preventing the manhole cover replacement ring from separating from the mounting frame. When unlocking is performed, the manhole cover limit mechanism descends, triggering a chain reaction. Driven vertically downward by the elastic force of the unlocking spring, the unlocking block rotates the movable locking plate. As the movable locking plate separates from the mounting frame limit slot, the mechanical constraint on the manhole cover replacement ring is released, achieving simultaneous unlocking. This combines the manhole cover unlocking and ring unlocking functions into one. Operators only need to complete a single unlocking action to trigger the dual, compound unlocking process. This significantly reduces maintenance steps and significantly improves the efficiency of manhole cover replacement operations. This is particularly suitable for scenarios where frequent replacement of manhole cover components is required, effectively reducing manual operation intensity and maintenance costs.

[0016] 3. This invention utilizes the interlocking action of the unlocking knob on the top of the manhole cover key and the unlocking linkage base to push the unlocking linkage block along the unlocking linkage block slot into the key fixing hole on the driving gear, thereby coupling the manhole cover key and the driving gear. Rotation of the manhole cover key drives the driving gear to rotate, thereby interlocking the locking block of the manhole cover to unlock the key. Because the structure of the manhole cover key can be individually manufactured according to needs, the problem of a single key opening all manhole covers due to the universality of the key is avoided, greatly improving safety and preventing manhole cover theft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is an exploded schematic diagram of the overall structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the key structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the explosion of the key structure of the present invention.

[0021] Figure 5 For the present invention Figure 2 Schematic diagram of the structure at point A.

[0022] Figure 6 For the present invention Figure 2 Schematic diagram of the structure at point B.

[0023] Figure 7 For the present invention Figure 2 Structural diagram of location C

[0024] The accompanying drawings are as follows: 1. manhole cover body; 11. key hole; 12. drain hole; 13. cover opening hole; 14. ring bracket; 15. driving gear; 151. key guide hole; 152. key fixing slot; 153. key limit plate; 16. driven gear; 17. lock block connecting rod; 2. manhole cover replacement ring bracket; 21. fixing notch; 211. unlocking spring base; 212. unlocking block slide; 213. positioning column; 21 4. Locking spring; 22. Unlocking block; 221. Unlocking guide block; 222. Unlocking spring; 23. Movable locking plate; 231. Locking block; 232. Positioning shaft slot; 24. Manhole cover locking ring; 25. Manhole cover limit hole; 3. Manhole cover mounting bracket; 31. Mounting bracket support plate; 32. Mounting bracket fixing hole; 33. Mounting bracket limit slot; 34. Mounting bracket limit block; 4. Manhole cover locking block; 41. Manhole cover limit mechanism slot ; 411, guide groove of manhole cover limit mechanism; 412, base of return spring of manhole cover limit mechanism; 42, notch of release block; 421, spring of release block; 422, guide groove of release block; 43, manhole cover limit mechanism; 431, guide block of manhole cover limit mechanism; 432, manhole cover limit block; 433, notch of linkage block; 4331, guide groove of linkage block; 434, return spring of manhole cover limit block; 44, release block; 441, first Lock tongue; 442, release block guide block; 45, second lock tongue; 451, linkage block spring; 452, linkage block guide block; 5, manhole cover key; 51, handle; 52, unlocking knob; 521, unlocking connecting rod; 522, unlocking linkage base; 53, unlocking linkage block; 531, unlocking linkage block guide block; 532, linkage arm; 54, unlocking linkage block notch; 541, unlocking linkage block guide groove; 55, key base. DETAILED DESCRIPTION

[0025] The technical solutions of the present invention will be described clearly and completely below in conjunction with the drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples. The anti-theft manhole cover involved in the present invention is not limited to the various structures described in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Reference Figure 1 、 Figure 2 and Figure 4 The present invention provides an anti-theft manhole cover. A keyhole 11 is provided on the top of the manhole cover body 1, a driving gear 15 is provided on the bottom of the manhole cover body 1, a driven gear 16 is provided on the bottom of the manhole cover body 1, an annular bracket 14 is provided on the bottom of the annular bracket 14, a locking block connecting rod 17 is provided on the middle of the annular bracket 14, a manhole cover locking block 4 is provided on the end of the locking block connecting rod 17, a manhole cover limiting mechanism notch 41 and a release block notch 42 are provided on the middle of the manhole cover locking block 4, a manhole cover limiting mechanism notch 43 is provided on the middle of the manhole cover limiting mechanism notch 41, a release block 44 is provided on the middle of the release block notch 42, and the circumferential side of the manhole cover body 1 is provided with a keyhole 11, a keyhole 12 is provided with a keyhole 13, a keyhole 14 is provided with a keyhole 14, a keyhole 12 is provided with a keyhole 15, a keyhole 16 is provided with a keyhole 17 ... A manhole cover replacement ring frame 2 is provided on the surface, a fixed slot 21 is provided on the outside of the manhole cover replacement ring frame 2, an unlocking block 22 is provided inside the fixed slot 21, and a movable locking plate 23 is provided at the bottom of the unlocking block 22. A manhole cover mounting frame 3 is provided on the periphery of the manhole cover replacement ring frame 2, a mounting frame fixing hole 32 is provided on the side of the manhole cover mounting frame 3, a mounting frame support plate 31 is fixedly connected to the side of the manhole cover mounting frame 3, a mounting frame limiting groove 33 is provided on the inside of the manhole cover mounting frame 3, an unlocking knob 52 is provided on the top of the manhole cover key 5, a key base 55 is provided at the bottom of the manhole cover key 5, and an unlocking linkage block 53 is provided on the top of the key base 55.

[0027] Reference Figure 1 and Figure 5 The top of the manhole cover body 1 is provided with a cover opening hole 13 and a drainage hole 12. There are fifteen drainage holes 12 arranged in a circle. The two cover opening holes 13 are arranged symmetrically. A key guide hole 151 is provided in the middle of the driving gear 15, a key fixing slot 152 is provided at the top of the driving gear 15, a key limiting plate 153 is provided at the bottom of the driving gear 15, and there are four locking block connecting rods 17.

[0028] Use the manhole cover key 5 to unlock the manhole cover, and then use a special tool to connect it to the cover opening hole 13 to lift the manhole cover. At the same time, the cover opening hole 13 also has a drainage function. The key limit plate 153 ensures that the manhole cover key 5 is at the correct height so that the key side device is aligned with the key fixing groove 152, thereby realizing the subsequent unlocking operation. The rotation of the manhole cover key 5 is transmitted to the surrounding manhole cover locking blocks 4 through the locking block connecting rod 17, realizing the linkage operation of each manhole cover locking block 4, and ensuring the synchronous and stable unlocking.

[0029] Reference Figure 2 and Figure 7 , four fixed notches 21 are evenly arranged on the outside of the manhole cover replacement ring frame 2, and the inner side of the manhole cover replacement ring frame 2 is fixedly connected with a manhole cover locking ring 24, and a manhole cover limiting hole 25 is opened on the upper part of the manhole cover locking ring 24. The four manhole cover limiting holes 25 and the fixed notches 21 correspond to each other, and an unlocking spring base 211 is opened on the top of the fixed notch 21, and an unlocking spring 222 is provided at the bottom of the unlocking spring base 211. The bottom of the unlocking spring 222 is fixedly connected to an unlocking block 22, and the side of the unlocking block 22 is fixedly connected to an unlocking guide block 221, and the bottom of the unlocking block 22 is provided with an unlocking spring base 211. A movable locking plate 23 is provided, a locking block 231 is provided on the side of the movable locking plate 23, a positioning shaft slot 232 is provided on the side of the movable locking plate 23, an unlocking block slide groove 212 is provided on the side of the fixed slot 21, a positioning column 213 is fixedly connected to the side of the fixed slot 21, two positioning columns 213 are symmetrically arranged on both sides of the fixed slot 21, a locking spring 214 is fixedly connected to the side of the fixed slot 21, the positioning shaft slot 232 and the positioning column 213 cooperate with each other, and the locking spring 214 is provided between the movable locking plate 23 and the side of the fixed slot 21.

[0030] When there is no force on the inner bottom surface of the unlocking block 22, the unlocking block 22 moves downward under the action of the unlocking spring 222, and then pushes the movable locking plate 23 to rotate around the positioning shaft slot 232, so that the locking block 231 disengages from the limit block 34, and then the manhole cover replacement ring frame 2 and the manhole cover mounting frame 3 are released from the locked state. At this time, the manhole cover locking block 4 is also in the unlocked state, so that the subsequent replacement operation of the manhole cover replacement ring frame 2 is carried out, which significantly simplifies the operation process. The user only needs a single rotation operation to trigger the entire linkage mechanism to complete the unlocking or locking action, which greatly improves the convenience and efficiency of manhole cover installation and disassembly, and effectively reduces the manual operation cost and time cost.

[0031] Reference Figure 2 The four mounting frame limiting grooves 33 are evenly arranged on the inner side of the manhole cover mounting frame 3, and the side of the mounting frame limiting groove 33 is fixedly connected with a mounting frame limiting block 34, and the four mounting frame limiting blocks 34 are closely arranged.

[0032] Reference Figure 1The four manhole cover locking blocks 4 are evenly arranged at the bottom of the manhole cover body 1. A manhole cover limiting mechanism guide groove 411 is opened inside the manhole cover limiting mechanism slot 41, and a limiting block guide groove 422 is opened on the inner side of the limiting block slot 42. There are two limiting block guide grooves 422. The side of the limiting block slot 42 is fixedly connected with a limiting block spring 421, and a limiting block 44 is provided at the end of the limiting block spring 421. The long side of the limiting block 44 is fixedly connected with a first locking tongue 441, and the short side of the limiting block 44 is fixedly connected with a limiting block guide block 442.

[0033] Reference Figure 1 The bottom of the cover limiting mechanism slot 41 is provided with a manhole cover limiting mechanism return spring base 412, and the top of the manhole cover limiting mechanism return spring base 412 is provided with a manhole cover limiting block return spring 434. Four manhole cover limiting block return springs 434 are evenly fixedly connected to the bottom of the manhole cover limiting mechanism 43. A manhole cover limiting mechanism guide block 431 is provided on the side of the manhole cover limiting mechanism 43. The top of the manhole cover limiting mechanism 43 is fixedly connected with the manhole cover limiting block 432. A linkage block slot 433 is provided at the top of the manhole cover limiting mechanism 43, and a linkage block guide groove 4331 is provided on the side of the linkage block slot 433. The two linkage block guide grooves 4331 are symmetrically arranged on the side of the linkage block slot 433. A linkage block spring 451 is provided on the side of the short side of the manhole cover limiting mechanism 43. The end face of the linkage block spring 451 is fixedly connected to the second lock tongue 45, and the side of the second lock tongue 45 is fixedly connected to the linkage block guide block 452.

[0034] The side surfaces of the second lock tongue 45 and the first lock tongue 441 are both provided with inclined surfaces, and the two inclined surfaces can overlap with each other. Under the action of the linkage block spring 451, the second lock tongue 45 can be moved, and then with the lateral movement of the first lock tongue 441 and the vertical movement of the manhole cover limiting mechanism 43, the second lock tongue 45 and the first lock tongue 441 can be locked and unlocked with each other, and all of them are carried out automatically, ensuring the maximal simplification of operation and improving the unlocking efficiency.

[0035] Reference Figure 1 The top of the manhole cover key 5 is provided with a handle 51, and the inside of the manhole cover key 5 is provided with an unlocking link 521, which is fixedly connected to the bottom of the unlocking knob 52, and the bottom of the unlocking link 521 is fixedly connected to the unlocking linkage base 522. The bottom of the manhole cover key 5 is provided with a key base 55, and the top of the key base 55 is provided with an unlocking linkage block slot 54, and the side of the unlocking linkage block slot 54 is provided with an unlocking linkage block guide groove 541. The upper part of the unlocking linkage block slot 54 is provided with an unlocking linkage block 53, and the side of the unlocking linkage block 53 is provided with a linkage arm 532 connected to the unlocking linkage base 522, and the side of the unlocking linkage block 53 is fixedly connected with an unlocking linkage block guide block 531.

[0036] The unlocking linkage block 53 on the side of the manhole cover key 5 is extended under the action of the unlocking knob 52, and the unlocking linkage block 53 and the key fixing slot 152 are combined with each other to realize the synchronous rotation of the manhole cover key 5 and the driving gear 15, so as to perform the unlocking linkage operation, and the key fixing slot 152 is hidden in the lower part of the manhole cover body 1, and the inner side and the inner side of the keyhole 11 are flush with each other, and cannot be found from the outside, thereby further improving the anti-theft ability of the manhole cover.

[0037] Reference Figure 1 , four unlocking linkage block notches 54 are arranged circumferentially on the top of the key base 55 , there are four unlocking linkage blocks 53 , and there are four linkage arms 532 .

[0038] The working principle of the present invention is as follows: in the locked state, the top of the manhole cover locking block 4 rotates to achieve the overlap between the top of the manhole cover locking block 4 and the bottom of the manhole cover locking ring 24, thereby achieving the locking effect on the manhole cover body 1. At the same time, the manhole cover limiting block 432 and the manhole cover limiting hole 25 arranged inside the manhole cover locking block 4 cooperate with each other to achieve the limiting effect on the manhole cover locking block 4 and prevent the displacement of the manhole cover locking block 4. When the manhole cover limiting block 432 enters the manhole cover limiting hole 25, the manhole cover limiting Under the action of the manhole cover limit block return spring 434, the top of the block 432 causes the unlocking block 22 to rise to the top of the fixed slot 21. At the same time, the movable locking plate 23 is in a locked state under the action of the locking spring 214. The locking block 231 arranged on the side of the movable locking plate 23 and the mounting frame limit block 34 inside the mounting frame limit groove 33 engage with each other to achieve the fixing effect on the manhole cover replacement ring frame 2, ensuring the synchronous fixation of the manhole cover body 1 and the manhole cover replacement ring frame 2 in the locked state.

[0039] When the manhole cover is unlocked, the manhole cover is unlocked by the specially constructed manhole cover key 5. In the initial state, the unlocking linkage block 53 set at the lower part of the manhole cover key 5 is inside the unlocking linkage block notch 54, which is convenient for inserting the manhole cover key 5 into the key hole 11. When the manhole cover key 5 is inserted into the key hole 11, the key limiting plate 153 set at the bottom of the driving gear 15 plays a limiting role on the manhole cover key 5, ensuring that the manhole cover key 5 is in the correct position when unlocking, thereby realizing the docking of the unlocking linkage block 53 and (152), ensuring the smooth unlocking. When the manhole cover key 5 is in the correct position, the unlocking knob 52 on the top of the manhole cover key 5 is turned to unlock the key 5. 521 drives the unlocking linkage base 522 to rotate, and under the drive of the linkage arm 532, the unlocking linkage block 53 extends along the unlocking linkage block slot 54 and enters the key fixing slot 152 on the driving gear 15, so as to combine the manhole cover key 5 and the driving gear 15. By rotating the handle 51, the driving gear 15 is driven to rotate, and the driven gear 16 engaged with the driving gear 15 through gears is rotated. Then, driven by the driven gear 16, the annular bracket 14 is rotated, and the manhole cover locking block 4 is driven to rotate around the axis on the manhole cover body 1 through the locking block connecting rod 17, so that the manhole cover locking block 4 is separated from the manhole cover locking ring 24, thereby realizing the unlocking of the manhole cover body 1.

[0040] When the manhole cover replacement ring is unlocked, the manhole cover limit block 432 is disengaged from the manhole cover limit hole 25 on the manhole cover locking ring 24 through the rotation of the manhole cover locking block 4. Due to the slope of the side of the manhole cover limit block 432, the manhole cover limit mechanism 43 is compressed by the bottom of the manhole cover locking ring 24 and moves downward along the manhole cover limit mechanism guide groove 411. At the same time, the release block 44 moves outward along the release block guide groove 422 under the action of the release block spring 421. The synchronous movement of the two realizes the control of the manhole cover limit mechanism. The locking effect of 43 is that, specifically, when the limit release block 44 and the manhole cover limiting mechanism 43 move, an inclined surface is provided on the side of the second lock tongue 45. When the manhole cover limiting mechanism 43 moves downward, the side inclined surface of the first lock tongue 441 squeezes the inclined surface of the second lock tongue 45, so that the second lock tongue 45 is retracted along the linkage block notch 433. When the limit release block 44 is fully extended, the top surface of the second lock tongue 45 and the bottom surface of the first lock tongue 441 are in the same plane. Under the action of the linkage block spring 451, the second lock tongue 45 is retracted. When the second locking tongue 45 is in operation, it moves along the notch 433 of the linkage block to the bottom of the first locking tongue 441 again, so that the bottom of the first locking tongue 441 set on the side of the limit release block 44 coincides with the top of the second locking tongue 45 under the movement of the limit release block 44, and then the manhole cover limiting mechanism 43 is locked to the bottom of the notch 41 of the manhole cover limiting mechanism through the joint action of the second locking tongue 45 and the first locking tongue 441, so as to carry out the subsequent locking operation of the manhole cover body 1 again. After the limiting hole 25, due to the lack of the pushing effect of the manhole cover limiting block 432, the unlocking block 22 moves downward along the fixed slot 21 under the action of the unlocking spring 222, thereby realizing that the bottom of the unlocking block 22 pushes the movable locking plate 23 to rotate around the positioning axis slot 232, thereby realizing the disengagement of the locking block 231 on the side of the movable locking plate 23 and the mounting frame limiting block 34 inside the mounting frame limiting groove 33, thereby realizing the unlocking of the manhole cover body 1 and the simultaneous unlocking of the manhole cover replacement ring frame 2.

[0041] In the synchronous locking state, when the manhole cover locking block 4 does not rotate, the top of the second locking tongue 45 and the bottom of the first locking tongue 441 coincide with each other, and the manhole cover limiting mechanism 43 is in a locked state under the action of the second locking tongue 45. Subsequently, under the push of the locking block connecting rod 17, the manhole cover locking block 4 rotates around the axis set at the bottom of the manhole cover body 1, and the limit release block 44 set on the manhole cover locking block 4 contacts the inner wall of the manhole cover replacement ring frame 2. As the manhole cover locking block 4 rotates, the limit release block 44 moves along the limit release block guide groove 422, and then the second locking tongue 45 and the first locking tongue 4 are locked. 41 disengages, realizing unlocking of the manhole cover limiting mechanism 43, and the manhole cover limiting block 432 locks the manhole cover locking block 4 under the action of the manhole cover limiting block return spring 434. At the same time, when the manhole cover limiting block 432 moves upward, it pushes the unlocking block 22 to move upward, so that the bottom of the unlocking block 22 disengages from the movable locking plate 23, and then the movable locking plate 23 rotates around the positioning shaft slot 232 under the action of the locking spring 214, so that the locking block 231 and the mounting frame limiting block 34 engage with each other, realizing locking of the manhole cover replacement ring frame 2.

[0042] Secondly: The drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures may refer to conventional designs. The same embodiment and different embodiments of the present invention may be combined with each other without conflict.

[0043] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An anti-theft manhole cover, comprising a manhole cover body (1) and a manhole cover key (5), characterized in that: The top of the manhole cover body (1) is provided with a keyhole (11), the bottom of the manhole cover body (1) is provided with a driving gear (15), the bottom of the manhole cover body (1) is provided with a driven gear (16), the bottom of the manhole cover body (1) is provided with an annular bracket (14), the middle of the annular bracket (14) is provided with a locking block connecting rod (17), the end of the locking block connecting rod (17) is provided with a manhole cover locking block (4), the middle of the manhole cover locking block (4) is provided with a manhole cover limiting mechanism notch (41), the middle of the manhole cover limiting mechanism notch (41) is provided with a manhole cover limiting mechanism (43), the middle of the manhole cover locking block (4) is provided with a release block notch (42), the middle of the release block notch (42) is provided with a release block (44), the circumferential side of the manhole cover body (1) is provided with a locking block connecting rod (17), and the locking block connecting rod (17) is provided with a locking block (44). A manhole cover replacement ring frame (2) is provided, a fixing notch (21) is provided on the outside of the manhole cover replacement ring frame (2), an unlocking block (22) is provided inside the fixing notch (21), a movable locking plate (23) is provided at the bottom of the unlocking block (22), a manhole cover mounting frame (3) is provided on the periphery of the manhole cover replacement ring frame (2), a mounting frame fixing hole (32) is provided on the side of the manhole cover mounting frame (3), a mounting frame support plate (31) is fixedly connected to the side of the manhole cover mounting frame (3), a mounting frame limiting groove (33) is provided on the inside of the manhole cover mounting frame (3), an unlocking knob (52) is provided on the top of the manhole cover key (5), a key base (55) is provided at the bottom of the manhole cover key (5), and an unlocking linkage block (53) is provided on the top of the key base (55).

2. The anti-theft manhole cover according to claim 1, characterized in that: The top of the manhole cover body (1) is provided with a cover opening hole (13), the top of the manhole cover body (1) is provided with a drainage hole (12), there are fifteen drainage holes (12) arranged in a circle, two of the cover opening holes (13) are symmetrically arranged, a key guide hole (151) is provided in the middle of the driving gear (15), a key fixing groove (152) is provided at the top of the driving gear (15), a key limiting plate (153) is provided at the bottom of the driving gear (15), and there are four locking block connecting rods (17).

3. The anti-theft manhole cover according to claim 1, characterized in that: The four fixed notches (21) are evenly arranged on the outside of the manhole cover replacement ring frame (2); a manhole cover locking ring (24) is fixedly connected to the inside of the manhole cover replacement ring frame (2); a manhole cover limiting hole (25) is provided on the upper part of the manhole cover locking ring (24); the four manhole cover limiting holes (25) and the fixed notches (21) correspond to each other; an unlocking spring base (211) is provided on the top of the fixed notch (21); an unlocking spring (222) is provided at the bottom of the unlocking spring base (211); an unlocking block (22) is fixedly connected to the bottom of the unlocking spring (222); an unlocking guide block (221) is fixedly connected to the side of the unlocking block (22); and the bottom of the unlocking block (22) is provided A movable locking plate (23) is provided, a locking block (231) is provided on the side of the movable locking plate (23), a positioning shaft notch (232) is provided on the side of the movable locking plate (23), an unlocking block slide groove (212) is provided on the side of the fixed notch (21), a positioning column (213) is fixedly connected to the side of the fixed notch (21), two positioning columns (213) are symmetrically arranged on both sides of the fixed notch (21), a locking spring (214) is fixedly connected to the side of the fixed notch (21), the positioning shaft notch (232) and the positioning column (213) cooperate with each other, and the locking spring (214) is provided between the movable locking plate (23) and the side of the fixed notch (21).

4. The anti-theft manhole cover according to claim 1, characterized in that: The four (33) are evenly arranged on the inner side of the manhole cover mounting frame (3), and the side of the mounting frame limiting groove (33) is fixedly connected with a mounting frame limiting block (34), and the four mounting frame limiting blocks (34) are closely arranged.

5. The anti-theft manhole cover according to claim 1, characterized in that: The four manhole cover locking blocks (4) are evenly arranged at the bottom of the manhole cover body (1); a manhole cover limiting mechanism guide groove (411) is provided inside the manhole cover limiting mechanism notch (41); a limiting block guide groove (422) is provided on the inner side of the limiting block notch (42); there are two limiting block guide grooves (422); a limiting block spring (421) is fixedly connected to the side of the limiting block (42); a limiting block (44) is provided at the end of the limiting block spring (421); a first locking tongue (441) is fixedly connected to the long side of the limiting block (44); and a limiting block guide block (442) is fixedly connected to the short side of the limiting block (44).

6. The anti-theft manhole cover according to claim 5, characterized in that: A manhole cover limiting mechanism return spring base (412) is provided at the bottom of the manhole cover limiting mechanism notch (41), a manhole cover limiting mechanism return spring base (412) is provided at the top of the manhole cover limiting mechanism return spring base (412), four manhole cover limiting block return springs (434) are evenly fixedly connected to the bottom of the manhole cover limiting mechanism (43), a manhole cover limiting mechanism guide block (431) is provided on the side of the manhole cover limiting mechanism (43), and the top of the manhole cover limiting mechanism (43) is fixedly connected to the manhole cover limiting block (432). The top of the manhole cover limiting mechanism (43) is provided with a linkage block notch (433), the side of the linkage block notch (433) is provided with a linkage block guide groove (4331), the two linkage block guide grooves (4331) are symmetrically arranged on the side of the linkage block notch (433), the short side of the manhole cover limiting mechanism (43) is provided with (451), the end face of the linkage block spring (451) is fixedly connected to the second locking tongue (45), and the side of the second locking tongue (45) is fixedly connected to the linkage block guide block (452).

7. The anti-theft manhole cover according to claim 1, characterized in that: The top of the manhole cover key (5) is provided with a handle (51), the interior of the manhole cover key (5) is provided with an unlocking link (521), the unlocking link (521) is fixedly connected to the bottom of the unlocking link (521), the bottom of the unlocking link (521) is fixedly connected to an unlocking linkage base (522), the bottom of the manhole cover key (5) is provided with a key base (55), the top of the key base (55) is provided with an unlocking linkage block notch (54), the side of the unlocking linkage block notch (54) is provided with an unlocking linkage block guide groove (541), the upper part of the unlocking linkage block notch (54) is provided with an unlocking linkage block (53), the side of the unlocking linkage block (53) is provided with a linkage arm (532) connected to the unlocking linkage base (522), and the side of the unlocking linkage block (53) is fixedly connected to the unlocking linkage block guide block (531).

8. The anti-theft manhole cover according to claim 7, characterized in that: The four unlocking linkage block notches (54) are arranged circumferentially on the top of the key base (55), there are four unlocking linkage blocks (53), and there are four linkage arms (532).

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