Manhole lock device

Abstract

The utility model discloses a manhole lockset device, the manhole lockset device is applied to a manhole assembly, the manhole lockset device comprises a lock body, an unlocking and locking assembly and an elastic block assembly, the unlocking and locking assembly comprises a locking part, a lock rod and a rotating part, and the rotating part can rotate to drive the lock rod to move, so that the lock rod can drive the locking part to move; the elastic block assembly is connected with the rotating part and can limit the rotating part, the manhole lock device comprises an unlocking state and a locking state, in the unlocking state, the elastic block assembly unlocks rotation of the rotating part, the rotating part rotates to drive the lock rod to move, the lock rod can drive the locking part to move, and the locking part and a fastener on the manhole blind plate are unlocked; and in the locking state, the locking rod drives the locking part to move, so that the locking part and a fastener on the manhole blind plate are locked in a matched mode, and the elastic block assembly limits rotation of the rotating part. According to the technical scheme, operation is easy, manhole blind plates of various specifications can be compatible, the application range is widened, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of manhole safety control, and in particular to a manhole locking device. Background Art

[0002] In industries like petrochemicals and water conservancy, maintenance work on containers and pipelines is common. These inlets and outlets typically utilize flanged manholes. To prevent unauthorized personnel from entering, blind manhole plates are installed for safety control. In existing technology, blind manhole plates are typically locked with simple mechanical locks, reducing safety. Furthermore, most manhole locks utilize a single, fixed structure, with no way to adjust the locking rod length to accommodate different sizes of blind manhole plates, limiting their applicability. Utility Model Content

[0003] The embodiment of the utility model provides a manhole lock device, which is easy to operate and can be compatible with manhole blind plates of various specifications, thereby expanding the scope of application and being conducive to improving safety.

[0004] The present invention provides a manhole lock device, which is applied to a manhole assembly. The manhole assembly includes a manhole blind plate and a fastener. The fastener is arranged circumferentially on the manhole blind plate so that the manhole blind plate seals the manhole. The manhole lock device includes a lock body, a lock release assembly, and a spring assembly. The lock release assembly includes a locking portion, a locking rod, and a rotating portion. One end of the locking rod is connected to the rotating portion, and the other end is connected to the locking portion. The rotating portion can rotate to drive the locking rod to move, so that the locking rod can drive the locking portion to move. The spring assembly is disposed within the lock body and connected to the rotating portion. The spring assembly can limit the rotating portion. The manhole lock device includes an unlocked state and a locked state. In the unlocked state, the spring assembly releases the rotation of the rotating portion, and the rotation of the rotating portion drives the locking rod to move, so that the locking rod can drive the locking portion to move, thereby releasing the lock between the locking portion and the fastener on the manhole blind plate. In the locked state, the locking rod drives the locking portion to move, so that the locking portion and the fastener on the manhole blind plate are locked together, and the spring assembly limits the rotation of the rotating portion.

[0005] The technical solution of the present invention is to set an unlocking assembly and a spring assembly in the manhole lock device. The unlocking assembly includes a locking part, a locking rod and a rotating part. The locking rod can change the extension length relative to the lock body under the drive of the rotating part. The locking rod can drive the locking part to move, so that the locking part and the fastener on the manhole blind plate are unlocked or locked together, so as to realize the unlocking or locking of the manhole blind plate by the manhole lock device. In addition, the spring assembly is connected to the rotating part. In the locked state, the spring assembly can limit the rotation of the rotating part, preventing the rotating part from rotating to drive the locking rod to move, thereby preventing the locking part and the fastener on the manhole blind plate from being unlocked in the locked state. The technical solution of the present invention can conveniently and quickly unlock the manhole blind plate, and is also compatible with manhole blind plates of various specifications, expanding the scope of application and helping to improve safety.

[0006] According to the aforementioned embodiment of the present invention, the spring block assembly includes: a support block, an elastic portion, and an elastic member. The elastic portion is movably disposed on the support block and is capable of limiting or releasing the limit on the rotating portion. The elastic member is disposed on the support block and connected to the elastic portion. The elastic member is capable of providing an elastic restoring force for the movement of the elastic portion. Under the action of the elastic restoring force of the elastic member, at least a portion of the elastic portion can be retracted into the support block or protruded from the support block, thereby releasing the lock or abutment with the rotating portion.

[0007] According to the aforementioned embodiment of the present invention, one side of the rotating part close to the spring block assembly includes a plurality of limiting teeth arranged in sequence, and the elastic part includes a limiting surface. In the unlocked state, the limiting surface is separated from the limiting teeth, and the spring block assembly unlocks the rotation of the rotating part; in the locked state, the limiting surface abuts against the limiting teeth, and the spring block assembly limits the rotation of the rotating part.

[0008] According to the aforementioned embodiment of the present invention, the limiting surface includes a stress groove, the inner shape of the stress groove matches the shape of the limiting tooth, so that the limiting tooth can be matched and connected with the stress groove to limit the rotation of the rotating part.

[0009] According to the aforementioned embodiment of the present invention, the locking rod includes a plurality of grooves arranged in sequence along the extension direction of the locking rod, and the rotating part also includes a plurality of limiting members, which can extend into the grooves and cooperate with the grooves to connect, so that the rotating part can drive the locking rod to move to adjust the extension length of the locking rod relative to the lock body.

[0010] According to the aforementioned embodiment of the present utility model, the back side of the locking portion has a connecting portion that matches and connects with the locking rod, and the locking portion has a locking groove that matches with the fastener on the manhole blind plate.

[0011] According to the aforementioned embodiment of the present invention, the manhole lock device further includes: a lock core, which is arranged on the lock body and includes a lock hole for inserting an unlocking key.

[0012] According to the aforementioned embodiment of the present invention, the manhole lock device also includes: a rotating shaft, which is arranged between the lock core and the spring block assembly. The unlocking key inserted into the lock core can drive the rotating shaft to move, so that the rotating shaft pushes the spring block assembly to release the limit on the rotating part.

[0013] According to the aforementioned embodiment of the present invention, the manhole lock device further includes: an identification component, which is arranged on the lock core and close to the lock hole, and the identification component can identify the unlocking key.

[0014] According to the aforementioned embodiment of the present invention, the manhole lock device further includes: a torsion plate, which is connected to the rotating part and can rotate synchronously with the rotating part. The unlocking key inserted into the lock core can drive the torsion plate and the rotating part to rotate in sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 This is a structural diagram of an embodiment of the manhole lock device of the present invention in a locked state;

[0017] Figure 2 This is a structural diagram of an embodiment of a manhole lock device of the present invention in an unlocked state;

[0018] Figure 3 This is a schematic diagram of the exploded structure of an embodiment of the manhole lock device of the present utility model;

[0019] Figure 4 This is a schematic diagram of the explosion structure of the bullet block assembly in one embodiment of the manhole lock device of the present utility model;

[0020] Figure 5 This is a structural diagram of the rotating part in one embodiment of the manhole lock device of the present utility model;

[0021] Figure 6 This is a structural diagram of the elastic part in one embodiment of the manhole lock device of the present utility model;

[0022] Figure 7 This is a schematic cross-sectional view of the connection between the rotating part and the spring block assembly in one embodiment of the manhole lock device of the present invention;

[0023] Figure 8 This is a schematic side cross-sectional view of an embodiment of a manhole lock device of the present invention;

[0024] Figure 9 This is a bottom view of an embodiment of a manhole lock device of the present invention.

[0025] Description of Figure Numbers:

[0026] Lock body-100, unlocking assembly-200, spring assembly-300, lock cylinder-400, rotating shaft-500, identification assembly-600, twist plate-700, manhole assembly-800;

[0027] Locking portion 210, locking rod 220, rotating portion 230, supporting block 310, elastic portion 320, elastic member 330, locking hole 410, first rotating shaft 510, second rotating shaft 520, second through hole 710, manhole blind plate 810, fastener 820;

[0028] Connecting portion 211, locking groove 212, groove 221, limiting tooth 231, limiting member 232, first through hole 233, limiting surface 321, telescopic end 322, elastic member mounting portion 323, connecting member 324;

[0029] Stress groove-3211, inclined surface-3212.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0034] The embodiment of the utility model provides a manhole lock device, which is easy to operate and can be compatible with manhole blind plates of various specifications, thereby expanding the scope of application and being conducive to improving safety.

[0035] like Figures 1 to 3 As shown, an embodiment of the present invention provides a manhole lock device, and the manhole lock device is applied to a manhole assembly 800, and the manhole assembly 800 includes a manhole blind plate 810 and a fastener 820. The fastener 820 is arranged circumferentially on the manhole blind plate 810, so that the manhole blind plate 810 closes the manhole. The manhole lock device includes: a lock body 100, an unlocking lock assembly 200 and a spring block assembly 300. The unlocking lock assembly 200 includes a locking portion 210, a locking rod 220 and a rotating portion 230. One end of the locking rod 220 is connected to the rotating portion 230, and the other end is connected to the locking portion 210. The rotating portion 230 can rotate to drive the locking rod 220 to move, so that the locking rod 220 can drive the locking portion 210 to move. In this embodiment, the unlocking lock assembly 200 includes four locking rods 220 and four locking portions 210, and the locking portion 210 and the locking rod 220 are arranged in a one-to-one correspondence. As shown Figures 7 and 8 As shown, the spring block assembly 300 is disposed inside the lock body 100 and connected to the rotating part 230 . The spring block assembly 300 can limit the rotating part 230 .

[0036] like Figures 1 to 2 As shown, the manhole lock device includes an unlocked state and a locked state. In the unlocked state, the spring assembly 300 unlocks the rotation of the rotating part 230, and the rotation of the rotating part 230 drives the locking rod 220 to move, so that the locking rod 220 can drive the locking part 210 to move, so that the locking part 210 and the fastener 820 on the manhole blind plate 810 are unlocked; in the locked state, the locking rod 220 drives the locking part 210 to move, so that the locking part 210 and the fastener 820 on the manhole blind plate 810 cooperate to lock, and the spring assembly 300 limits the rotation of the rotating part 230.

[0037] The technical solution of the present utility model is to provide an unlocking assembly 200 and a spring assembly 300 in the manhole lock device. The unlocking assembly 200 includes a locking portion 210, a locking rod 220, and a rotating portion 230. The locking rod 220 can change the extension length relative to the lock body 100 under the drive of the rotating portion 230. The locking rod 220 can drive the locking portion 210 to move, so that the locking portion 210 and the fastener 820 on the manhole blind plate 810 are unlocked or locked together, thereby realizing that the manhole lock device unlocks or locks the manhole blind plate 810. In addition, the spring assembly 300 is connected to the rotating portion 230. In the locked state, the spring assembly 300 can limit the rotation of the rotating portion 230, preventing the rotating portion 230 from rotating to drive the locking rod 220 to move, thereby preventing the locking portion 210 and the fastener 820 on the manhole blind plate 810 from being unlocked in the locked state. The technical solution of the present utility model can conveniently and quickly unlock the manhole blind plate 810, and is also compatible with a variety of manhole blind plates 810 of different specifications, thereby expanding the scope of application and improving safety.

[0038] In this embodiment, the lock body 100 has a plurality of mounting holes, which are used to mount the lock body 100 on the manhole blind plate 810. The mounting holes can also be used to fine-tune the mounting position of the lock body 100 on the manhole blind plate 810 to achieve more precise installation requirements.

[0039] like Figure 4 As shown, the spring block assembly 300 includes: a support block 310, a spring portion 320, and an elastic member 330. The spring portion 320 is movably disposed on the support block 310 and is capable of limiting or releasing the limit on the rotating portion 230. The elastic member 330 is disposed on the support block 310 and connected to the spring portion 320. The elastic member 330 is capable of providing an elastic restoring force for the movement of the spring portion 320. Under the action of the elastic restoring force of the elastic member 330, at least a portion of the structure of the spring portion 320 can be retracted into the support block 310 or protruded from the support block 310, thereby separating from or abutting the rotating portion 230. The elastic part 320 has a telescopic end 322. In the default state, the telescopic end 322 protrudes from the plane of the support block 310 under the elastic force of the elastic member 330. After unlocking, the telescopic end 322 is retracted into the support block 310 and is flush with the plane of the support block 310, so that the elastic part 320 can unlock the restriction on the rotating part 230 and achieve unlocking.

[0040] like Figure 5 As shown, the side of the rotating part 230 close to the bullet assembly 300 includes a ratchet, which has a plurality of sequentially arranged limiting teeth 231, and the ratchet is arranged concentrically with the rotating part 230. Figures 1 to 5As shown, the telescopic end 322 has a limiting surface 321 on the side close to the rotating portion 230. In the unlocked state, the limiting surface 321 is separated from the limiting tooth 231, and the spring assembly 300 unlocks the rotation of the rotating portion 230, allowing the rotating portion 230 to rotate freely. In the locked state, the limiting surface 321 abuts against the limiting tooth 231, and the spring assembly 300 limits the rotation of the rotating portion 230, so that the rotating portion 230 can only rotate in one direction and cannot rotate in the opposite direction, preventing the rotation of the rotating portion 230 from driving the locking rod 220 to move, thereby preventing the locking portion 210 from being unlocked from the fastener 820 on the manhole blind plate 810 in the locked state.

[0041] like Figure 6 As shown, the elastic part 320 further includes an elastic member mounting portion 323, and the elastic member 330 is located between the elastic member mounting portion 323 and the support block 310 to support and elastically restore the elastic part 320. The elastic part 320 further includes a connecting member 324, which connects the elastic part 320 to the support block 310.

[0042] In this embodiment, the elastic member 330 is a torsion spring structure that can provide a good elastic restoring force for the movement of the telescopic end 322 of the elastic portion 320. It should be noted that in other embodiments, the elastic portion 320 and the elastic member 330 can also be configured in other forms, such as a paddle-spring structure, where the paddle is movable within the support block 310 through the elastic restoring force of the spring; or it can be configured as an electromagnetic induction structure. When unlocking is sensed, the elastic member 330 contracts, driving the elastic portion 320 to move, and the telescopic end 322 retracts into the support block 310 and becomes flush with the plane of the support block 310, allowing the elastic portion 320 to release the restriction on the rotating portion 230, thereby achieving unlocking. This application does not limit the specific form of the elastic portion 320 and the elastic member 330.

[0043] like Figure 6 As shown, the limiting surface 321 includes a force groove 3211, and the shape of the force groove 3211 matches the shape of the limiting tooth 231, so that the limiting tooth 231 can be matched and connected with the force groove 3211. In the unlocked state, the limiting tooth 231 is separated from the limiting surface 321, and the rotating part 230 can rotate freely, and the spring block assembly 300 can unlock the rotation of the rotating part 230; in the locked state, the limiting tooth 231 is abutted against the force groove 3211 to prevent the rotating part 230 from rotating in the opposite direction.

[0044] And, as Figure 6As shown, the limiting surface 321 also includes an inclined surface 3212 arranged at an angle, and the inclined surface 3212 is located in the force-bearing groove 3211. The inclined surface 3212 is located in the rotation direction of the rotating part 230 when it is unlocked. Therefore, during the rotation process of the rotating part 230 when it is locked, the inclined surface 3212 will limit the movement of the rotating part 230, so that the rotating part 230 can only rotate in the locking direction and cannot rotate in the opposite direction of unlocking. During the locking process, the rotation of the rotating part 230 drives the locking rod 220 and the locking part 210 to move in turn, so that the locking part 210 can lock the fastener 820 of the manhole blind plate 810. By providing the force-bearing groove 3211, it is helpful to ensure that the rotating part 230 cannot rotate in the opposite direction when locked, avoiding safety hazards caused by improper operation.

[0045] like Figures 1 to 2 As shown, the locking rod 220 includes a plurality of grooves 221 spaced apart from one another along the extension direction of the locking rod 220, with the grooves 221 being equidistantly spaced. The rotating portion 230 also includes a plurality of stoppers 232, which are adapted to extend into and engage with the grooves 221. This allows the rotational motion of the rotating portion 230 to be converted into linear motion of the locking rod 220, which can slide through the lock body 100 to adjust the extension length of the locking rod 220 relative to the lock body 100.

[0046] like Figure 9 As shown, the back of the locking part 210 has a connecting part 211 that matches and connects with the locking rod 220. By providing the connecting part 211 on the back of the locking part 210, the connecting part 211 can be prevented from being removed when the locking part 210 matches and connects with the fastener 820 on the manhole blind plate 810, thereby forming an anti-disassembly structure, which is beneficial to improving the safety of the manhole lock device. In this embodiment, the connecting part is a screw-screw hole connection form to connect the locking part to the locking rod. Figures 1 to 2 As described above, the locking portion 210 has a locking groove 212 that cooperates with the fastener 820 on the manhole blind plate 810. In the locked state, the locking groove 212 locks the fastener 820. In this embodiment, the locking groove 212 is a semicircular groove that cooperates with the fastener 820, which is a nut, to lock the locking portion 210 and the fastener 820.

[0047] like Figure 3 As shown, the manhole lock device further includes a lock core 400, which is disposed on the lock body 100 and includes a keyhole 410 for inserting an unlocking key. After the unlocking key is inserted into the keyhole 410 of the lock core 400, the unlocking key can unlock the position limit of the spring assembly 300 on the rotating part 230, allowing the rotating part 230 to rotate freely, thereby driving the locking rod 220 and the locking part 210 to move in sequence, thereby unlocking the manhole blind plate 810.

[0048] like Figure 3As shown, the manhole lock device further includes: a rotating shaft 500, which is arranged between the lock cylinder 400 and the spring assembly 300. When the unlocking key is inserted into the lock cylinder 400, the rotating shaft 500 can be driven to move, so that the rotating shaft 500 pushes the spring assembly 300 to release the restriction on the rotating part 230. In the present application, the rotating shaft 500 includes a first rotating shaft 510 and a second rotating shaft 520 that are rotatably connected to each other. The first rotating shaft 510 is rotatably connected to the lock cylinder 400, and the second rotating shaft 520 is rotatably connected to the spring assembly 300. When the unlocking key is inserted into the lock cylinder 400 and rotated to unlock, the unlocking key pushes the first rotating shaft 510, and the first rotating shaft 510 rotates counterclockwise, driving the second rotating shaft 520 to drive the second rotating shaft 520 to push the elastic part 320, so that the elastic part 320 retracts into the support block 310. The spring assembly 300 can release the restriction on the rotating part 230, and the rotating part 230 can rotate freely, thereby achieving unlocking.

[0049] like Figure 3 As shown, the manhole lock device also includes: an identification component 600, which is arranged on the lock core 400 and close to the lock hole 410, and the identification component 600 can identify the unlocking key. In the present application, the identification component 600 includes a wireless code chip, which is located above the lock hole 410 and provides a unique identity code for the manhole lock device. When the unlocking key is inserted into the lock core 400, the unlocking key recognizes the wireless code chip, thereby identifying the identity code of the manhole lock device. If the identity code of the manhole lock device is consistent with the identity code authorized by the unlocking key operation ticket, the manhole lock device operation authority is obtained, and the manhole lock device can be unlocked; if it is inconsistent, the operation authority cannot be obtained, and the manhole lock device cannot be operated, which is conducive to improving the intelligence and practicality of the manhole lock device, and improving the safety and protection level of the manhole lock device.

[0050] like Figure 3 As shown, the manhole lock device also includes: a torsion plate 700, which is connected to the rotating part 230 and can rotate synchronously with the rotating part 230. When the unlocking key is inserted into the lock cylinder 400, twisting the torsion plate 700 can drive the rotating part 230 to rotate synchronously. Figure 3 As shown, the rotating part 230 also includes a first through hole 233, and the twist plate 700 also includes a second through hole 710. The lock core 400 is installed in the first through hole 233 and the second through hole 710. After the unlocking key is inserted into the lock core 400, twisting the twist plate 700 can drive the rotating shaft 500 to rotate, thereby driving the rotating part 230 to rotate.

[0051] Next, the specific unlocking process of the manhole lock device is described.

[0052] In the initial state, the manhole lock device is in a locked state, the locking rod 220 and the locking part 210 are fixed in corresponding positions, and the spring assembly 300 locks the rotating part 230 and the torsion plate 700. At this time, the unlocking key is not inserted into the lock core 400, and the rotating part 230 cannot rotate.

[0053] When the manhole blind plate 810 needs to be unlocked, the unlocking key is inserted into the lock cylinder 400, and the identity code of the manhole lock device is identified through the wireless code piece. If the identity code of the manhole lock device is consistent with the identity code authorized by the unlocking key operation ticket, the manhole lock device is allowed to be unlocked. The unlocking key rotates 180° clockwise, driving the rotating shaft 500 to rotate. The rotating shaft 500 pushes the elastic part 320 in the spring block assembly 300 downward, releasing the limit of the spring block assembly 300 on the rotating part 230, and the rotating part 230 can rotate freely. The rotation of the rotating part 230 drives the locking rod 220 to rotate, and the locking rod 220 slides from the lock body 100, and the locking rod 220 drives the locking part 210 to move, such as Figure 2 As shown, the locking portion 210 is unlocked from the fastener 820 on the manhole blind plate 810, achieving an unlocked state. After the unlocking key is removed, the torsion plate 700 and the rotating portion 230 can still rotate freely. The operator can rotate the rotating portion 230 to move the four locking rods 220 to the fully open position, allowing the manhole blind plate 810 to be opened.

[0054] When the manhole blind plate 810 needs to be locked, the manhole blind plate 810 is reset, the unlocking key is inserted, and it is rotated 180 degrees counterclockwise. The lock core 400 pushes the shaft 500 and twists the twist plate 700 counterclockwise. The rotating part 230 also drives the locking rod 220 to reset. Figure 1 As shown, the locking portion 210 is connected to the fastener 820 on the manhole blind plate 810 to achieve locking. The spring assembly 300 locks the rotating portion 230 to prevent reverse operation. After the unlocking key is removed, the manhole lock device enters the locked state. Under the action of the elastic member 330, the spring portion 320 returns to its original position protruding from the support block 310, ensuring that the locking rod 220 is fixed and the manhole lock device is locked.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A manhole lock device, characterized in that: The manhole lock device is applied to a manhole assembly, which includes a manhole blind plate and a fastener. The fastener is arranged circumferentially on the manhole blind plate so that the manhole blind plate closes the manhole; The manhole lock device comprises: Lock body; An unlocking lock assembly, the unlocking lock assembly comprising a locking portion, a locking rod, and a rotating portion, wherein one end of the locking rod is connected to the rotating portion, and the other end is connected to the locking portion, and the rotating portion is capable of rotating to drive the locking rod to move, so that the locking rod can drive the locking portion to move; and a spring block assembly, the spring block assembly being disposed inside the lock body and connected to the rotating part, the spring block assembly being capable of limiting the rotating part; In which, the manhole lock device includes an unlocked state and a locked state. In the unlocked state, the spring block assembly unlocks the rotation of the rotating part, and the rotation of the rotating part drives the locking rod to move, so that the locking rod can drive the locking part to move, so that the locking part and the fastener on the manhole blind plate are unlocked; in the locked state, the locking rod drives the locking part to move, so that the locking part and the fastener on the manhole blind plate are locked together, and the spring block assembly limits the rotation of the rotating part.

2. The manhole lock device according to claim 1, characterized in that: The bullet block assembly includes: Support blocks; an elastic part, the elastic part being movably provided on the supporting block, and the elastic part being capable of limiting or releasing the limiting of the rotating part; and An elastic member is arranged on the support block and connected to the elastic part. The elastic member can provide an elastic restoring force for the movement of the elastic part. Under the action of the elastic restoring force of the elastic member, at least part of the structure of the elastic part can be retracted into the support block or protrude from the support block to release the lock or abutment with the rotating part.

3. The manhole lock device according to claim 2, characterized in that: A side of the rotating part close to the spring block assembly includes a plurality of limiting teeth arranged in sequence, and the elastic part includes a limiting surface. In the unlocked state, the limiting surface is separated from the limiting teeth, and the spring block assembly unlocks the rotation of the rotating part; in the locked state, the limiting surface abuts against the limiting teeth, and the spring block assembly limits the rotation of the rotating part.

4. The manhole lock device according to claim 3, characterized in that: The limiting surface includes a force-bearing groove, the inner shape of which matches the shape of the limiting tooth, so that the limiting tooth can be matched and connected with the force-bearing groove to limit the rotation of the rotating part.

5. The manhole lock device according to claim 1, characterized in that: The locking rod includes a plurality of grooves arranged in sequence along the extension direction of the locking rod, and the rotating part also includes a plurality of limiting members, which can extend into the grooves and cooperate with the grooves to enable the rotating part to drive the locking rod to move to adjust the extension length of the locking rod relative to the lock body.

6. The manhole lock device according to claim 1, characterized in that: The back side of the locking portion is provided with a connecting portion which is matched with the locking rod, and the locking portion is provided with a locking groove which is matched with a fastener on the manhole blind plate.

7. The manhole lock device according to claim 1, characterized in that: The manhole lock device also includes: A lock core is arranged on the lock body, and the lock core includes a lock hole for inserting an unlocking key.

8. The manhole lock device according to claim 7, characterized in that: The manhole lock device also includes: The rotating shaft is arranged between the lock core and the spring block assembly. The unlocking key is inserted into the lock core to drive the rotating shaft to move, so that the rotating shaft pushes the spring block assembly to release the limit on the rotating part.

9. The manhole lock device according to claim 7, characterized in that: The manhole lock device also includes: An identification component is arranged on the lock core and close to the lock hole, and the identification component can identify the unlocking key.

10. The manhole lock device according to claim 7, characterized in that: The manhole lock device also includes: A torsion plate is connected to the rotating part and can rotate synchronously with the rotating part. The unlocking key is inserted into the lock core to drive the torsion plate and the rotating part to rotate in sequence.

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