Pick-and-place well lid lock

Abstract

The utility model relates to a kind of taking and placing type well lid lock, it is to solve the structure of existing similar product is relatively single, less steel pin connecting rod motor assembly, steel pin direct drive motor assembly, with telescopic lock tongue linkage block assembly, with swing lock tongue motor connecting rod assembly to realize unlocking and locking problem.The gist is that the main lock head of the well lid lock is steel pin connecting rod assembly, steel pin connecting rod assembly includes first steel pin, first connecting rod and second connecting rod, one end of first connecting rod and one end of second connecting rod are hinged to each other, the other end of first connecting rod is hinged with one end of first steel pin, the other end of first steel pin extends out of lock shell and is locked in the inner lock position of the inner diameter of cylinder body, the other end of second connecting rod is connected with the output shaft in the reduction gear box on the other side of lock shell by shaft sleeve, the drive shaft in reduction gear box is connected with motor shaft at the micro motor of this side of lock shell, unlocking sleeve in manual hole of reduction gear box is aligned with the second manual operation hole of cover body through unlocking hole of lock shell.

Description

Technical Field

[0001] This utility model relates to a manhole cover lock, specifically a removable manhole cover lock. Background Technology

[0002] Manhole covers are used in cities to seal the openings of underground pipelines (such as sewage, rainwater, water supply, electricity, communication, and gas pipelines). They cover the manholes of these pipelines, with an exit point leading to the surface at regular intervals. Manhole covers are typically made of reinforced concrete, metal, or reinforced plastics, and are primarily round or square in shape. For safety, especially for manhole covers used to lay fiber optic cables, locks are usually installed. Currently, there are two main types of manhole cover locks on the market: 1. Purely mechanical locks, opened with a mechanical key; 2. Electronic locks, controlled by NB-IoT. Meanwhile, besides the removable type, another major type of existing manhole cover is the hinged (flip-type), which generally uses a double or triple linkage to achieve locking. For example, Chinese patent application number 202010776871.8, published on October 13, 2020, entitled "A manhole cover lock assembly, a manhole cover lock and a manhole cover"; another example is Chinese patent application number 201920363600.2, authorized on February 11, 2020, entitled "A three-bar manhole cover lock". The above products and similar products mostly use a straight shaft drive to achieve unlocking and locking, and fewer use a crankshaft. At the same time, most of them use a tool key to unlock through the main operating hole at the center of the manhole cover, and fewer use a secondary operating hole at the lock to drive the lock to achieve unlocking and locking. Summary of the Invention

[0003] To overcome the aforementioned shortcomings, the purpose of this utility model is to provide a detachable manhole cover lock that addresses the technical problems of existing similar products having a relatively simple structural design, lacking a second manual operation hole, and rarely employing steel pin linkage motor assemblies, steel pin direct drive motor assemblies, telescopic lock tongue linkage block assemblies, or swing lock tongue motor linkage assemblies for unlocking and locking. This objective is achieved through the following technical solution.

[0004] A removable manhole cover lock has a cover body located in a stepped groove at the top of a cylindrical body. The inner diameter of the cylindrical body below the cover body has an inner locking position with a diameter smaller than the upper and lower inner diameters of the cylindrical body. The lock body at the bottom of the cover body is locked to the inner locking position of the cylindrical body by a main lock head extending from the lock housing. A rotating component is located in the middle of the cover body, penetrating the cover body and extending to the bottom. A first manual operation hole is located at the center of the rotating component. A second manual operation hole is located above the lock housing of the lock body. The second manual operation hole is aligned with the unlocking sleeve inside the lock housing through an unlocking hole at the top of the lock body. One side of the rotating component at the bottom of the cover body is connected to one end of a straight shaft or crankshaft. The other end of the straight shaft or crankshaft passes through a bearing seat on one side of the bottom edge of the cover body. Simultaneously, the end of the straight shaft or crankshaft is locked to the inner locking position of the cylindrical body. The straight shaft or crankshaft serves as a secondary lock head on one side of the main lock head at the lock body. The straight shaft or crankshaft between the rotating component and the bearing seat is integrated with the lock housing of the lock body via a connecting plate. The key structural design features a main lock head that is a steel pin connecting rod assembly. This assembly includes a first steel pin, a first connecting rod, and a second connecting rod. One end of the first connecting rod and one end of the second connecting rod are hinged together. The other end of the first connecting rod is hinged to one end of the first steel pin. The other end of the first steel pin extends out of the lock housing and is locked in the inner locking position of the inner diameter of the cylinder. The other end of the second connecting rod is connected to the output shaft inside the reduction gearbox on the other side of the lock housing via a bushing. The drive shaft inside the reduction gearbox is connected to the motor shaft at the micro motor on the same side of the lock housing. The unlocking sleeve inside the manual hole at the reduction gearbox is aligned with the second manual operation hole of the cover through the unlocking hole of the lock housing. The crankshaft is either straight or L-shaped, with the short side of the L-shaped crankshaft curving outward at a 120-degree angle.

[0005] The main lock head is a direct drive lock shaft. One end of the direct drive lock shaft is connected to the moving iron core that is telescopically operated at the direct drive solenoid valve inside the lock housing. The unlocking sleeve inside the manual hole at the moving iron core is aligned with the second manual operation hole of the cover through the unlocking hole of the lock housing. The other end of the direct drive lock shaft extends out and is limited and locked in the inner lock position of the inner diameter of the cylinder.

[0006] The main lock cylinder is a telescopic bolt. One end of the telescopic bolt is hinged to one end of a movable block inside the lock housing via a connecting block. The unlocking sleeve inside the manual hole of the movable block is aligned with the second manual operation hole of the cover through the unlocking hole of the lock housing. The other end of the telescopic bolt extends out and is locked in the inner lock position of the cylinder's inner diameter. The aforementioned movable block can also be replaced by a rocker arm motor. The rocker arm motor and connecting block drive the telescopic bolt to lock or unlock, and the key drives the rocker arm motor to rotate and unlock in an emergency.

[0007] The telescopic latch inside the lock case is provided with a first spring at its rear, and a second spring is provided on the inner wall of the lock case on the other side of the hinge of the movable block.

[0008] The main lock head is a swing bolt. One end of the swing bolt is hinged to one end of the fixed block inside the lock housing. A torsion spring is provided at the hinge shaft. The other end of the swing bolt extends out and is locked in the inner lock position of the inner diameter of the cylinder. A second steel pin is provided in the housing on one side of the fixed block and the swing bolt. One end of the second steel pin in the lock housing abuts against the protruding side post on one side of the swing bolt and limits its movement. This end of the second steel pin is connected to one end of the unlocking linkage assembly through the motor module. The unlocking sleeve in the manual hole at the crank arm sleeve shaft at the other end of the unlocking linkage assembly is aligned with the second manual operation hole of the cover through the unlocking hole of the lock housing.

[0009] The other end of the second steel pin extends out of the lock housing and is locked to the inner locking position of the cylinder's inner diameter. Thus, the third locking point position is set via the second steel pin.

[0010] A third spring is provided at the rear of the fixing block inside the lock case.

[0011] The unlocking sleeve is a lock cylinder module. A magnetic steel pin and a positioning spring are located at a positioning hole on one side of the lock cylinder module. The magnetic steel pin abuts against the inner wall of the lock case via the positioning spring and one end is inserted into the side hole of the lock cylinder module. The magnetic steel pin is attracted to a lock cylinder magnet inside the lock cylinder module. This lock cylinder magnet and another lock cylinder magnet with opposite magnetic poles are fixedly installed inside the lock cylinder module and connected as a single unit. When the key is inserted into the lock cylinder module of the lock body, the key wedges into the lock cylinder module. Rotating the lock cylinder module with the key causes the other lock cylinder magnet to repel the magnetic steel pin, causing the magnetic steel pin to retract from the side hole of the lock cylinder module, allowing the key to rotate the lock cylinder module. This structure, through the key driving the lock cylinder module to rotate, achieves the switching between the two lock cylinder magnets with different magnetic poles within the lock cylinder module.

[0012] The lock cylinder module contains only one lock cylinder magnet. A key magnet protrudes from one end of the key. When the key is inserted into the lock cylinder module, the protrusion presses down on the lock cylinder magnet until it aligns with and repels the magnetic steel pin. A fourth spring is located within the lock cylinder module at the bottom of the lock cylinder magnet. The magnetic poles of the lock cylinder magnet and the key magnet are opposite. This structure allows for switching between the two lock cylinder magnets with different magnetic poles within the lock cylinder module by pressing down on the lock cylinder magnet with the key magnet, which then replaces it with the key magnet.

[0013] Based on the above structural characteristics, it can also be applied in hinged manhole cover locks, specifically as follows: one side of the cover is hinged to the top opening of the cylinder, and the cover is hinged closed and placed in the stepped groove at the top opening of the cylinder. The lock shell is provided in the inner locking position of the inner diameter of the cylinder below the other side of the cover, which is symmetrical to the hinge. This utility model has a reasonable structural design and various operation methods and structural forms. In particular, the second manual operation hole facilitates emergency operation. It retains the first manual operation hole at the center hole while operating through the main lock on one side under the manhole cover. It is suitable for use as a pick-and-place manhole cover lock and as a structural improvement of similar products. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the bottom structure of Embodiment 1 of this utility model. The dotted lines in the diagram represent the internal structure of the lock case.

[0015] Figure 2 yes Figure 1 A schematic diagram of the top structure.

[0016] Figure 3 yes Figure 1 A cross-sectional view of the lock body is shown in the figure, with part A defined in the figure.

[0017] Figure 4 yes Figure 3 Enlarged view of part A.

[0018] Figure 5 This is a schematic diagram of the bottom structure of Embodiment 2 of this utility model. The dotted lines in the diagram represent the internal structure of the lock case.

[0019] Figure 6 yes Figure 5 A cross-sectional view of the lock body is shown in the figure, with part B outlined in the figure.

[0020] Figure 7 yes Figure 6 Enlarged view of part B.

[0021] Figure 8 This is a schematic diagram of the bottom structure of Embodiment 3 of this utility model. The dotted lines in the diagram represent the internal structure of the lock case.

[0022] Figure 9 yes Figure 8 A cross-sectional view of the lock body is shown in the figure, with part C defined in the figure.

[0023] Figure 10 yes Figure 9 Enlarged view of part C.

[0024] Figure 11 yes Figure 10 Enlarged structural diagram of the lock body.

[0025] Figure 12 This is a schematic diagram of the bottom structure of Embodiment 4 of this utility model. The dotted line in the figure represents the internal structure of the lock case, and part D is framed.

[0026] Figure 13 yes Figure 12 Enlarged view of part D.

[0027] Figure 14 yes Figure 12 A cross-sectional view of the lock body is shown in the figure, with part E defined in the figure.

[0028] Figure 15 yes Figure 14 Enlarged view of part E.

[0029] Figure 16 yes Figure 12 Cross-sectional view of the unlocking sleeve Figure 1 .

[0030] Figure 17 yes Figure 12 Cross-sectional view of the unlocking sleeve Figure 2 .

[0031] Attached Figures and Their Names: 1. Cover, 2. Cylinder, 3. Rotating Component, 4. Straight Shaft, 5. Connecting Plate, 6. Shaft Seat, 7. Lock Case, 8. Steel Pin Linkage Assembly, 801. First Steel Pin, 9. Micro Motor, 10. Reduction Gearbox, 11. Crankshaft, 12. Direct Drive Solenoid Valve, 13. Direct Drive Lock Shaft, 14. Telescopic Lock Tongue, 15. Movable Block, 16. Swing Lock Tongue, 1601. Side Post, 17. Torsion Spring, 18. Second Steel Pin, 19. Motor Module, 20. Unlocking Linkage Assembly, 21. Crank Arm Sleeve Shaft, 22. Magnetic Steel Pin, 23. Fixing Block, 24. Lock Cylinder Module, 25. Lock Cylinder Magnet, 26. Key, 27. Key Magnet. Implementation

[0032] The structure and use of this utility model will now be further described with reference to the accompanying drawings. Figures 1-4In the first embodiment shown, the cover body 1 of the manhole cover lock is located in the stepped groove at the top of the cylinder 2. The inner diameter of the cylinder below the cover body has an inner locking position with a diameter smaller than the upper and lower inner diameters of the cylinder. The lock body at the bottom of the cover body is locked to the inner locking position of the cylinder by the main lock head extending out of the lock shell 7. A rotating part 3 is provided in the middle of the cover body, penetrating the cover body and extending to the bottom. The center of the rotating part has a first manual operation hole. The lock shell of the lock body has a second manual operation hole. The second manual operation hole is aligned with the unlocking sleeve inside the lock shell through the unlocking hole at the top of the lock body. One side of the rotating part at the bottom of the cover body is connected to one end of the straight shaft 4. The other end of the straight shaft or crankshaft passes through the bearing seat 6 on one side of the bottom edge of the cover body. At the same time, the end of the straight shaft or crankshaft is locked to the inner locking position of the cylinder. The straight shaft or crankshaft serves as the auxiliary lock head on the side of the main lock head at the lock body. The straight shaft or crankshaft between the rotating part and the bearing seat is connected to the lock shell of the lock body as a whole through the connecting plate 5. The aforementioned main lock head is a steel pin connecting rod assembly 8, which includes a first steel pin 801, a first connecting rod, and a second connecting rod. One end of the first connecting rod and one end of the second connecting rod are hinged to each other, and the other end of the first connecting rod is hinged to one end of the first steel pin. The other end of the first steel pin extends out of the lock housing and is locked at the inner locking position of the inner diameter of the cylinder. The other end of the second connecting rod is connected to the output shaft inside the reduction gearbox 10 on the other side of the lock housing through a bushing. The drive shaft inside the reduction gearbox is connected to the motor shaft at the micro motor 9 on the same side of the lock housing. The unlocking sleeve inside the manual hole at the reduction gearbox is aligned with the second manual operation hole of the cover through the unlocking hole of the lock housing. The crankshaft is in the shape of a straight line.

[0033] The specific usage of the above embodiment one is as follows: When the manhole cover is placed downwards, the first steel pin is in a retracted state; after the manhole cover is in place, the micro motor rotates and pushes the first steel pin forward, preventing the manhole cover from being lifted upwards. When the micro motor is in a locked state, and the micro motor fails and cannot retract the first steel pin, an emergency key is inserted from the middle of the manhole cover, rotating it to drive the straight shaft to pull the entire lock body towards the center, allowing the first steel pin to disengage from the locked state.

[0034] like Figures 5-7 In the second embodiment shown, the straight shaft is replaced by a crankshaft 11, which is L-shaped with its short side curving outward at a 120-degree angle. The main lock head is a direct-drive lock shaft 13. One end of the direct-drive lock shaft is connected to a moving iron core that operates by telescopic movement at the direct-drive solenoid valve 12 located inside the lock housing. The unlocking sleeve inside the manual hole at the moving iron core is aligned with the second manual operation hole of the cover through the unlocking hole of the lock housing. The other end of the direct-drive lock shaft extends out and is locked in the inner lock position of the inner diameter of the cylinder. Its usage is similar to that of the first embodiment described above: locking is achieved by activating the direct-drive solenoid valve, and manual unlocking is achieved by using the first and second manual operation holes.

[0035] like Figures 8-11In the third embodiment shown, the main lock head is a telescopic bolt 14. One end of the telescopic bolt is hinged to one end of a movable block 15 inside the lock housing via a connecting block. The unlocking sleeve inside the manual hole of the movable block is aligned with the second manual operation hole of the cover through the unlocking hole of the lock housing. The other end of the telescopic bolt extends out and is locked in the inner lock position of the inner diameter of the cylinder. A first spring is provided at the rear of the telescopic bolt inside the lock housing, and a second spring is provided on the inner wall of the lock housing on the opposite side of the hinge of the movable block. Its usage is similar to that of the first embodiment. When the cover is placed into the cylinder, the telescopic bolt automatically retracts and locks. Then, the first and second manual operation holes are used to manually unlock. The movable block can also be replaced by a rocker arm motor. The rocker arm motor and the connecting block drive the telescopic bolt to lock or unlock, and the key drives the rocker arm motor to rotate and unlock in an emergency.

[0036] like Figures 12-15 In the fourth embodiment shown, the main lock head is a swing latch 16. One end of the swing latch is hinged to one end of the fixed block 23 inside the lock housing. A torsion spring 17 is provided at the hinge shaft. The other end of the swing latch extends out and is locked in the inner lock position of the inner diameter of the cylinder. A second steel pin 18 is provided in the housing on one side of the fixed block and the swing latch. One end of the second steel pin in the lock housing abuts against and limits the side post 1601 protruding on one side of the swing latch. This end of the second steel pin is connected to one end of the unlocking linkage assembly 20 through the motor module 19. The unlocking sleeve in the manual hole at the crank arm sleeve shaft 21 at the other end of the unlocking linkage assembly is aligned with the second manual operation hole of the cover through the unlocking hole of the lock housing.

[0037] Furthermore, the other end of the aforementioned second steel pin extends out of the lock housing and is locked at the inner locking position of the inner diameter of the cylinder; a third spring is provided at the rear of the fixing block inside the lock housing.

[0038] Furthermore, such as Figure 16 As shown, the unlocking sleeve is a lock cylinder module 24. A magnetic steel pin 22 and a positioning spring are provided at the positioning hole on one side of the lock cylinder module. The magnetic steel pin abuts against the inner wall of the lock shell through the positioning spring and one end is inserted into the side hole of the lock cylinder module. The magnetic steel pin is attracted to a lock cylinder magnet 25 inside the lock cylinder module. The lock cylinder magnet and another lock cylinder magnet with opposite magnetic poles are fixedly installed inside the lock cylinder module and connected as one unit. When the key 26 is inserted into the lock cylinder module of the lock body, the key is wedged into the lock cylinder module. When the key rotates the lock cylinder module, the other lock cylinder magnet repels the magnetic steel pin, and the magnetic steel pin is pulled back out of the side hole of the lock cylinder module, so the key can rotate the lock cylinder module.

[0039] like Figure 17As shown, only one lock cylinder magnet is provided in the lock cylinder module. A key magnet 27 is provided on the protrusion of one end of the key. When the key is inserted into the lock body's core module, the protrusion of the key presses down on the lock cylinder magnet in the lock cylinder module until the key magnet aligns with and repels the magnetic steel pin. A fourth spring is provided in the lock cylinder module at the bottom of the lock cylinder magnet. The magnetic poles of the lock cylinder magnet and the key magnet are set oppositely.

[0040] The specific usage of the above-described embodiment four is as follows: When the manhole cover is placed downwards, the swing latch touches the edge of the underground manhole cover cylinder and moves backwards. After the manhole cover is in place, the swing latch, under the force of the third spring, pushes forward and locks into the inner locking position on the inner wall below the edge of the underground manhole cover cylinder. The motor module pushes the second steel pin to block the side post of the latch, preventing the swing latch from rotating and locking the manhole cover. The motor module unlocks, the second steel pin retracts from the side post of the swing latch, lifting the manhole cover. Under the force, the swing latch flips downwards until the manhole cover is lifted. In the emergency unlocking state, when the lock body is locked, the magnetic steel pin inside the lock cylinder module is attracted by the lock cylinder magnet, locking the lock cylinder.

[0041] When the key is inserted into the lock cylinder module of the lock body, the key rotates the lock cylinder module. The lock cylinder magnet and the magnetic steel pin repel each other, causing the magnetic steel pin to retract from the side hole of the lock cylinder module, allowing the key to rotate the lock cylinder module. The key drives the lock cylinder module to rotate, which pulls the entire motor module backward through the connecting rod of the unlocking linkage assembly. The end face of the second steel pin disengages from the cross-section of the swing bolt, at which point the swing bolt can flip, lifting the manhole cover upward. Simultaneously, the emergency unlocking method of the manhole cover's center position is retained. The entire lock body is pulled back to the center using the connecting rod, thus achieving emergency unlocking.

Claims

1. A removable manhole cover lock, wherein the cover body (1) of the manhole cover lock is located in the stepped groove at the top of the cylinder (2), and the inner diameter of the cylinder below the cover body is provided with an inner locking position with a diameter smaller than the upper and lower inner diameters of the cylinder. The lock body at the bottom of the cover body is locked to the inner locking position of the inner diameter of the cylinder by a main lock head extending out of the lock shell (7). A rotating part (3) is provided in the middle of the cover body, penetrating the cover body and extending to the bottom. A first manual operation hole is provided at the center of the rotating part, and a second manual operation hole is provided above the lock shell of the lock body. The manual operation hole is aligned with the unlocking sleeve inside the lock shell through the unlocking hole at the top of the lock body. One side of the rotating part at the bottom of the cover is connected to one end of the straight shaft (4) or crankshaft (11). The other end of the straight shaft or crankshaft passes through the bearing seat (6) on one side of the bottom edge of the cover. At the same time, the end of the straight shaft or crankshaft is locked to the inner locking position of the inner diameter of the cylinder. The straight shaft or crankshaft serves as the auxiliary lock head on the side of the main lock head at the lock body. The straight shaft or crankshaft between the rotating part and the bearing seat is connected to the lock shell of the lock body as a whole through the connecting plate (5). Its features are as follows: The main lock head is a steel pin connecting rod assembly (8), which includes a first steel pin (801), a first connecting rod and a second connecting rod. One end of the first connecting rod and one end of the second connecting rod are hinged to each other. The other end of the first connecting rod is hinged to one end of the first steel pin. The other end of the first steel pin extends out of the lock shell (7) and is locked at the inner lock position of the inner diameter of the cylinder (2) by the end limit. The other end of the second connecting rod is connected to the output shaft inside the reduction gearbox (10) on the other side of the lock shell through the bushing. The drive shaft inside the reduction gearbox is connected to the motor shaft at the micro motor (9) on the same side of the lock shell. The unlocking sleeve inside the manual hole at the reduction gearbox is aligned with the second manual operation hole of the cover (1) through the unlocking hole of the lock shell. The crankshaft is in the shape of a straight line or an L-shape.

2. The removable manhole cover lock according to claim 1, characterized in that... The main lock head is a direct drive lock shaft (13). One end of the direct drive lock shaft is connected to the moving iron core that is telescopically operated at the direct drive solenoid valve (12) inside the lock housing (7). The unlocking sleeve inside the manual hole at the moving iron core is aligned with the second manual operation hole of the cover (1) through the unlocking hole of the lock housing. The other end of the direct drive lock shaft extends out and is locked in the inner lock position of the inner diameter of the cylinder (2).

3. The removable manhole cover lock according to claim 1, characterized in that... The main lock head is a telescopic lock tongue (14). One end of the telescopic lock tongue is hinged to one end of the movable block (15) inside the lock shell (7) through a connecting block. The unlocking sleeve inside the manual hole of the movable block is aligned with the second manual operation hole of the cover (1) through the unlocking hole of the lock shell. The other end of the telescopic lock tongue extends out and is locked in the inner lock position of the inner diameter of the cylinder (2).

4. The removable manhole cover lock according to claim 3, characterized in that... The telescopic latch (14) inside the lock case (7) is provided with a first spring at the rear, and the hinge of the movable block (15) is provided with a second spring on the inner wall of the lock case on the other side.

5. The removable manhole cover lock according to claim 1, characterized in that... The main lock head is a swing lock tongue (16). One end of the swing lock tongue is hinged to one end of the fixed block (23) inside the lock shell (7). A torsion spring (17) is provided at the hinge shaft. The other end of the swing lock tongue extends out and is locked in the inner lock position of the inner diameter of the cylinder (2). A second steel pin (18) is provided in the housing of the fixed block and the swing lock tongue. One end of the second steel pin in the lock shell abuts against the side post (1601) protruding on one side of the swing lock tongue and is limited. This end of the second steel pin is connected to one end of the unlocking linkage assembly (20) through the motor module (19). The unlocking sleeve in the manual hole at the crank arm sleeve shaft (21) at the other end of the unlocking linkage assembly is aligned with the second manual operation hole of the cover (1) through the unlocking hole of the lock shell.

6. The removable manhole cover lock according to claim 5, characterized in that... The other end of the second steel pin (18) extends out of the lock shell (7) and is locked at the inner lock position of the inner diameter of the cylinder (2).

7. The removable manhole cover lock according to claim 5, characterized in that... A third spring is provided at the rear of the fixing block (23) inside the lock case (7).

8. The removable manhole cover lock according to claim 1, characterized in that... The unlocking sleeve is a lock cylinder module (24). A magnetic steel pin (22) and a positioning spring are provided at the positioning hole on one side of the lock cylinder module. The magnetic steel pin abuts against the inner wall of the lock shell through the positioning spring and one end is inserted into the side hole of the lock cylinder module. The magnetic steel pin is attracted to a lock cylinder magnet (25) inside the lock cylinder module. The lock cylinder magnet and another lock cylinder magnet with opposite magnetic poles are fixedly installed inside the lock cylinder module and connected as one unit. When the key (26) is inserted into the lock cylinder module of the lock body, the key is wedged into the lock cylinder module. The key rotates the lock cylinder module, and the other lock cylinder magnet repels the magnetic steel pin. The magnetic steel pin is pulled back out of the side hole of the lock cylinder module, and the key can then rotate the lock cylinder module.

9. The removable manhole cover lock according to claim 8, characterized in that... Only one lock core magnet (25) is provided in the lock core module (24). A key magnet (27) is provided on one side of the end of the key (26). When the key is inserted into the lock core module, the key protrusion presses down on the lock core magnet in the lock core module until the key magnet is aligned with the magnetic steel pin and repulses it. A fourth spring is provided in the lock core module at the bottom of the lock core magnet. The magnetic poles of the lock core magnet and the key magnet are set opposite.

10. The removable manhole cover lock according to any one of claims 1-9, characterized in that... One side of the cover (1) is fixed to the top opening of the cylinder (2) by hinge. The cover is hinged and placed in the stepped groove at the top opening of the cylinder. The lock shell (7) is provided in the inner locking position of the inner diameter of the cylinder below the other side of the cover symmetrical to the hinge.

Images