Mechanical key and well lid locking device
By using a mechanical key in the manhole cover locking device and using magnetic suction parts to attract the second clutch shaft, the problem of the inability to unlock the lock when the power supply of the manhole cover locking device is exhausted, and the normal unlocking operation of the manhole cover is achieved.
Patent Information
- Application Number
- CN202421186340.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-28
AI Technical Summary
When the power supply of the manhole cover locking device is exhausted or it is inconvenient to use power, the electric unlocking cannot be performed, resulting in the manhole cover being unable to unlock normally.
The mechanical key is used to unlock the lock, which includes a key handle and a magnetic suction piece. The magnetic suction piece attracts the second clutch shaft of the manhole cover locking device, so that it moves in a direction parallel to the locking mandrel shaft, thereby realizing unlocking.
When the power supply of the manhole cover locking device fails or is inconvenient to use power, the manhole cover can be unlocked through a mechanical key to ensure the normal operation of the manhole cover.
Smart Images
Figure CN222436103U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of Internet of Things intelligent terminals, and in particular to a mechanical key and a manhole cover locking device. Background Art
[0002] Power transmission, communication and other cables are laid through underground pipelines, and underground wells are set up in the underground pipelines to facilitate access to the underground pipelines for laying and maintaining cables. Usually, a manhole cover and a manhole cover locking device are set up at the entrance of the underground well to ensure the safety of advanced instruments in the underground well and underground pipelines. Some underground pipelines with higher safety requirements also use manhole cover locking devices with electric unlocking, but because it is inconvenient to use electricity outdoors, or the power supply of the manhole cover locking device is exhausted, the manhole cover locking device cannot be electrically unlocked at this time. Utility Model Content
[0003] In order to solve at least one of the above technical problems, the present application provides a mechanical key and a manhole cover locking device, and the technical solution adopted is as follows.
[0004] The manhole cover locking device provided in the present application adopts a mechanical key to unlock.
[0005] The mechanical key provided in the present application includes a key handle and a magnetic component, wherein the key handle has an unlocking end, and the unlocking end is used to connect the lock core shaft of the manhole cover locking device; the magnetic component is arranged at the unlocking end, and the magnetic component attracts the second clutch shaft of the manhole cover locking device in a magnetic manner so that the second clutch shaft moves in a direction parallel to the axial direction of the lock core shaft.
[0006] In certain embodiments of the present application, the unlocking end is provided with a cylindrical cavity, the cylindrical cavity is used to be sleeved on the end of the lock core shaft, and the magnetic attraction member is arranged in the cylindrical cavity.
[0007] In certain embodiments of the present application, the mechanical key includes a movable rod, which is arranged in the cylindrical cavity, and the magnetic attraction part is arranged at the end of the movable rod. The movable rod can move back and forth in the cylindrical cavity. When the unlocking end is connected to the lock core shaft, the movable rod retreats in the cylindrical cavity so that the cylindrical cavity is sleeved on the end of the lock core shaft.
[0008] In certain embodiments of the present application, the mechanical key includes an elastic member, which is sleeved on the outside of the movable rod, and the two ends of the elastic member respectively abut the inner wall of the cylindrical cavity and the movable rod. When the movable rod retreats in the cylindrical cavity, the elastic member is compressed and has compressive elastic potential energy.
[0009] In certain embodiments of the present application, the inner side wall of the cylindrical cavity is engaged with the lock core shaft so that the key handle can rotate the lock core shaft.
[0010] In certain embodiments of the present application, the cross-section of the cylindrical cavity is formed into a regular polygon or a quincunx shape.
[0011] In certain embodiments of the present application, an annular limiting portion is provided on the outer side surface of the unlocking end. After the key handle is connected to the lock core shaft and rotated, the annular limiting portion abuts against the inner wall of the lock shell to prevent the mechanical key from separating from the manhole cover locking device.
[0012] In certain embodiments of the present application, the mechanical key includes a handle, and the handle is disposed on an end of the key handle away from the unlocking end.
[0013] In certain embodiments of the present application, the handle is configured as a rod-shaped structure perpendicular to the axial direction of the key handle.
[0014] The embodiments of the present application have at least the following beneficial effects: the unlocking end face of the key handle abuts against the end face of the lock core shaft on the lock housing, and the magnetic attraction member in the key handle attracts the second clutch shaft in the lock core shaft to release the lock core shaft from the clamping connection, so that the key handle can rotate the lock core shaft to unlock the manhole cover locking device. The present application can be widely used in the field of the Internet of Things smart terminal technology. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The aspects and advantages described and / or attached in the embodiments of the present application will become apparent and easy to understand in conjunction with the following drawings. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.
[0016] Figure 1-1 This is a structural diagram of a mechanical key.
[0017] Figure 1-2 A cross-sectional view of a mechanical key.
[0018] Figure 1-3 This is a structural diagram of the key handle and handle.
[0019] Figure 2-1 It is a structural diagram of the lock core mechanism in the manhole cover locking device.
[0020] Figure 2-2 It is a cross-sectional view of the lock core mechanism.
[0021] Figure 2-3 It is a schematic diagram of the relative positions of the lock core shaft, the second clutch shaft and the third clutch shaft when the manhole cover locking device is locked.
[0022] Figure 2-4 This is a schematic diagram of the relative positions of the lock core shaft, the second clutch shaft and the third clutch shaft when the manhole cover locking device is unlocked.
[0023] Reference numerals:
[0024] 1000, key handle;
[0025] 1100, unlocking end; 1101, cylindrical cavity;
[0026] 1201, annular limiting portion; 1202, annular slot;
[0027] 2100, magnetic parts;
[0028] 2200, movable rod;
[0029] 2300, elastic parts;
[0030] 3000, handle;
[0031] 4000, lock cylinder mechanism;
[0032] 4101, lock core shaft; 4102, lock tongue;
[0033] 4201, first clutch shaft; 4202, second clutch shaft; 4203, third clutch shaft; 4204, first clamping area;
[0034] 4301, first locking structure; 4302, second locking structure;
[0035] 4401. Second locking drive; 4402. Locking structure. DETAILED DESCRIPTION
[0036] The following is combined with Figure 1-1 To Attachment Figure 2-4 Embodiments of the present application are described in detail, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.
[0037] In the description of the present application, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like are used to indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The features defined as "first" and "second" are used to distinguish the feature names, rather than having special meanings. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.
[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0039] The present application relates to a manhole cover locking device, which is unlocked by a mechanical key.
[0040] In some exemplary embodiments, the manhole cover locking device includes a lock core mechanism 4000, a lock pin and a lock housing, wherein the lock core mechanism 4000 is disposed in the lock housing, the lock pin is disposed on the manhole cover, and the lock core mechanism 4000 is used to connect with the lock pin to achieve locking. Specifically, the lock core mechanism 4000 includes a lock core shaft 4101 and a lock tongue 4102, the lock tongue 4102 is connected to the lock core shaft 4101, and the lock tongue 4102 is engaged with the lock pin to achieve locking.
[0041] The lock core mechanism 4000 includes a locking clutch assembly, which is used to clamp the lock core shaft 4101 so that the lock core shaft 4101 can rotate or cannot rotate. In conjunction with the drawings, the locking clutch assembly includes a first clutch shaft 4201, a second clutch shaft 4202 and a third clutch shaft 4203. The lock core shaft 4101 is provided with a hollow inner cavity along its own axial direction. The first clutch shaft 4201 is sleeved on the outer side of the first end of the lock core shaft 4101, the second clutch shaft 4202 is provided in the inner cavity of the lock core shaft 4101, and the third clutch shaft 4203 is sleeved on the outer side of the second end of the lock core shaft 4101. The first clutch shaft 4201 and the lock core shaft 4101 can rotate relative to each other, the second clutch shaft 4202 can reciprocate in the axial direction of the lock core shaft 4101, and the third clutch shaft 4203 can reciprocate along the axial direction of the lock core shaft 4101.
[0042] Further, the lock core mechanism 4000 includes a first locking structure 4301, a first through hole is provided on the side wall of the lock core shaft 4101, the first through hole penetrates the side wall of the lock core shaft 4101, the first locking structure 4301 is movably provided in the first through hole, and the first through hole can reciprocate in the first through hole, so as to be engaged with the second clutch shaft 4202 or the third clutch shaft 4203. In conjunction with the accompanying drawings, the outer peripheral side wall of the second clutch shaft 4202 is provided with a second engaging area, and the inner peripheral side wall of the third clutch shaft 4203 is provided with a third engaging area. It can be understood that if the first locking structure 4301 in the first through hole is partially located in the second engaging area, the first locking structure 4301 is engaged with the outer side wall of the second clutch shaft 4202; if the first locking structure 4301 in the first through hole is partially located in the third engaging area, the first locking structure 4301 is engaged with the inner side wall of the third clutch shaft 4203.
[0043] Specifically, when the manhole cover locking device is locked, the first locking structure 4301 is located near the outside of the first through hole, the first locking structure 4301 is engaged with the third engaging area, the first locking structure 4301 is engaged with the inner wall of the third clutch shaft 4203, and the second end of the lock core shaft 4101 does not protrude from the end of the third clutch shaft 4203 or the surface of the lock shell. The first clutch shaft 4201 rotates and can push the second clutch shaft 4202 to move axially along the lock core shaft 4101, and the second engaging area moves to the position corresponding to the first through hole. At this time, if pressure is applied to the third clutch shaft 4203, the third clutch shaft 4203 can be moved axially along the lock core shaft 4101, and the inner side wall of the third clutch shaft 4203 seals the first through hole and pushes the first locking structure 4301 to the other end of the first through hole, so that the first locking structure 4301 is engaged with the second engaging area. At this time, the second end of the lock core shaft 4101 protrudes from the end of the third clutch shaft 4203, so as to apply torque to the lock core shaft 4101, thereby unlocking the manhole cover locking device.
[0044] Furthermore, the lock core mechanism 4000 includes a second locking structure 4302, which is located outside the lock core mechanism 4000. The second locking structure 4302 can be engaged with the first clutch shaft 4201 to fix the first clutch shaft 4201 and prevent it from rotating. Furthermore, the second locking structure 4302 is movable to release the engagement of the second locking structure 4302 with the first clutch shaft 4201, so that the first clutch shaft 4201 can rotate.
[0045] The outer side wall of the first clutch shaft 4201 is provided with a concave first clamping area 4204, and the second locking structure 4302 is partially located in the first clamping area 4204, so as to achieve clamping with the first clutch shaft 4201. The second locking structure 4302 is provided as a spherical structure or a cylindrical structure with a spherical end.
[0046] The lock core mechanism 4000 electrically releases the clamping of the first clutch shaft 4201. Specifically, the movement of the second locking structure 4302 is realized by the second locking driver 4401. The second locking driver 4401 includes a motor. There are at least the following examples.
[0047] In some examples, the second locking structure 4302 is connected to the output end of the motor. When driven by the motor, the second locking structure 4302 approaches and engages with the first clutch shaft 4201 , or the second locking structure 4302 moves away from the first clutch shaft 4201 and is disengaged from the first clutch shaft 4201 .
[0048] In other examples, a stopper is provided at the output end of the motor, and when driven by the motor, the stopper approaches the first clutch shaft 4201 and abuts against the second locking structure 4302, so that the second locking structure 4302 remains engaged with the first clutch shaft 4201, or the stopper moves away from the first clutch shaft 4201, so that a movable space for the second locking structure 4302 is formed between the stopper and the first clutch shaft 4201, and when the first clutch shaft 4201 rotates along the first direction, the side wall of the first engaging area 4204 can push out the second locking structure 4302, thereby releasing the engagement of the second locking structure 4302 with the first clutch shaft 4201.
[0049] In some other examples, the output end of the motor is provided with a locking structure 4402, and the outer peripheral side wall of the locking structure 4402 is provided with a recessed avoidance area. The motor drives the locking structure 4402 to rotate so that the avoidance area is at a position corresponding to the second locking structure 4302. When the first clutch shaft 4201 rotates, the second locking structure 4302 moves to the avoidance area and contacts the first clutch shaft 4201. If the locking structure 4402 rotates further, the avoidance area and the second locking structure 4302 can be staggered, so that the second locking structure 4302 is engaged with the first engaging area 4204.
[0050] However, if the lock core mechanism 4000 has a power failure, the motor of the second locking driver 4401 cannot be started, resulting in the first clutch shaft 4201 being unable to release the engagement, and thus being unable to rotate, so that the first clutch shaft 4201 cannot push the second clutch shaft 4202, and further resulting in the first locking structure 4301 being unable to release the engagement with the third clutch shaft 4203, resulting in the manhole cover locking device being unable to be unlocked. In this case, the manhole cover locking device can also be unlocked using a mechanical key, and the operator uses the mechanical key to move the second clutch shaft 4202 in the lock core shaft 4101, so that the first locking structure 4301 is released from the engagement with the third clutch shaft 4203.
[0051] The other components and operations of the manhole cover locking device have been recorded in the relevant technology for ordinary technicians in this field and will not be described in detail here. The structure of the mechanical key will be introduced below.
[0052] The present application relates to a mechanical key, which includes a key handle 1000, and the key handle 1000 has an unlocking end 1100, which is used to connect to the lock core shaft 4101 of the manhole cover locking device. The rotation of the key handle 1000 can drive the lock core shaft 4101 to rotate, so that the manhole cover locking device is unlocked. Further, the mechanical key includes a magnetic member 2100, which is arranged at the unlocking end 1100. The magnetic member 2100 attracts the second clutch shaft 4202 of the manhole cover locking device in a magnetic way, so that the second clutch shaft 4202 moves in a direction parallel to the axial direction of the lock core shaft 4101, and the driving force of the first clutch shaft 4201 on the second clutch shaft 4202 is replaced by the power of magnetic attraction. In the initial state, the end face of the magnetic member 2100 is flush with the end face of the unlocking end 1100, so that the magnetic member 2100 can be attached to the end face of the lock core shaft 4101.
[0053] It is understandable that in the event of a power failure or power exhaustion in the lock core mechanism 4000, the locking clutch assembly cannot be electrically engaged, and the second clutch shaft 4202 and the third clutch shaft 4203 cannot release the engagement with the lock core shaft 4101. In this case, the unlocking end 1100 of the mechanical key can be attached to the end of the lock core shaft 4101, and the magnetic force of the magnetic suction member 2100 can drive the second clutch shaft 4202 to move in the lock core shaft 4101, so that the second engagement area moves to the position corresponding to the first through hole. At this time, the user applies pressure to the end of the third clutch shaft 4203 through the key handle 1000, and the third clutch shaft 4203 moves axially along the lock core shaft 4101 and enters the lock shell. Under the action of the inner wall of the third clutch shaft 4203, the first locking structure 4301 moves to a position engaged with the second engaging area and the first locking structure 4301 releases the engagement with the third clutch shaft 4203. The end of the lock core shaft 4101 is exposed at the end of the third clutch shaft 4203, so that the unlocking end 1100 is connected to the lock core shaft 4101, so that the mechanical key can rotate the lock core shaft 4101.
[0054] As an embodiment, the unlocking end 1100 is connected to the end of the lock cylinder shaft 4101 in a sleeved manner. In conjunction with the accompanying drawings, the unlocking end 1100 is provided with a cylindrical cavity 1101, which extends along the axial direction of the key handle 1000. The magnetic attraction member 2100 is provided in the cylindrical cavity 1101. The cylindrical cavity 1101 is used to be sleeved on the end of the lock cylinder shaft 4101. When the cylindrical cavity 1101 is sleeved on the end of the lock cylinder shaft 4101, the magnetic attraction member 2100 retreats into the cylindrical cavity 1101. Further, the inner side wall of the cylindrical cavity 1101 is clamped with the lock cylinder shaft 4101, so that the key handle 1000 can rotate the lock cylinder shaft 4101.
[0055] Specifically, the cross-section of the inner wall of the cylindrical cavity 1101 is formed into a regular polygon or a plum blossom shape, and correspondingly, the cross-section of the outer wall of the end of the lock core shaft 4101 is formed into a regular polygon or a plum blossom shape.
[0056] In some embodiments, the outer side of the unlocking end 1100 has an annular limiting portion 1201. After the key handle 1000 is connected to the lock core shaft 4101 and rotated, the annular limiting portion 1201 abuts against the inner side wall of the lock housing, so that the mechanical key is fixed to the surface of the lock housing, and the key handle 1000 cannot be pulled out of the manhole cover locking device. Further, the annular limiting portion 1201 is formed into a regular polygon or a plum blossom shape.
[0057] In conjunction with the accompanying drawings, the key handle 1000 is provided with an annular groove 1202 on the outer peripheral side wall of the unlocking end 1100, and the annular groove 1202 is recessed and formed on the outer peripheral side wall of the unlocking end 1100 to form an annular limiting portion 1201 on the outer side wall of the unlocking end 1100. It can be understood that when the annular limiting portion 1201 is engaged with the inner side wall of the lock housing, the annular groove 1202 is used to engage the lock housing of the manhole cover locking device so that the mechanical key is not separated from the manhole cover locking device.
[0058] As an embodiment, the mechanical key includes a movable rod 2200, which is disposed in the cylindrical cavity 1101 and arranged along the axial direction of the key handle 1000. The movable rod 2200 is arranged coaxially with the key handle 1000. The movable rod 2200 can reciprocate in the cylindrical cavity 1101. When the unlocking end 1100 is connected to the lock core shaft 4101, the movable rod 2200 retreats in the cylindrical cavity 1101, so that the cylindrical cavity 1101 forms a cavity at the end close to the key handle 1000, so that the cylindrical cavity 1101 is sleeved on the end of the lock core shaft 4101.
[0059] In conjunction with the accompanying drawings, the magnetic member 2100 is arranged at the end of the movable rod 2200. In this case, the magnetic member 2100 moves with the movable rod 2200. A recessed installation area is arranged at one end of the movable rod 2200 close to the end face of the unlocking end 1100. The magnetic member 2100 is arranged in the installation area, and the end face of the magnetic member 2100 is flush with the end face of the movable rod 2200. In the initial state, the end face of the movable rod 2200 is flush with the end face of the unlocking end 1100. It can be understood that when the movable rod 2200 retreats into the cylindrical cavity 1101, the magnetic member 2100 retreats with the movable rod 2200.
[0060] Further, the movable rod 2200 moves elastically in the cylindrical cavity 1101. Specifically, the mechanical key includes an elastic member 2300. When the movable rod 2200 retreats in the cylindrical cavity 1101, the elastic member 2300 is compressed and has a compressive elastic potential energy. It can be understood that when the key handle 1000 is pulled out of the manhole cover locking device, under the action of the elastic member 2300, the movable rod 2200 can move toward the end face direction of the unlocking end 1100, so that the magnetic attraction member 2100 is restored to a position flush with the end face of the unlocking end 1100 for the next use.
[0061] In some examples, the elastic member 2300 is configured as a spring, the elastic member 2300 is sleeved on the outside of the movable rod 2200, and the two ends of the elastic member 2300 respectively abut against the inner wall of the cylindrical cavity 1101 and the movable rod 2200. In conjunction with the drawings, the outer wall of the movable rod 2200 is provided with a shaft shoulder, the inner wall of the cylindrical cavity 1101 is provided with a hole shoulder, and the two ends of the elastic member 2300 respectively abut against the shaft shoulder of the movable rod 2200 and the hole shoulder of the cylindrical cavity 1101.
[0062] As an embodiment, the mechanical key includes a handle 3000, which is disposed on an end of the key handle 1000 away from the unlocking end 1100, and the user applies force to the handle 3000 to rotate the key handle 1000. In conjunction with the drawings, the handle 3000 is configured as a rod-shaped structure perpendicular to the axial direction of the key handle 1000, and both ends of the handle 3000 protrude from the outer side wall of the key handle 1000.
[0063] As another alternative embodiment, the handle 3000 is configured as a rotating wheel.
[0064] In the description of this specification, if the reference terms "one embodiment", "some examples", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0065] The above describes the implementation methods of the present application in detail in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.
[0066] In the description of this application, if "," appears in the patent name, it means an "and" relationship, not an "or" relationship. For example, if the patent name is "a kind of A, B", it means that the content required to be protected by this application is: the technical solution with the subject name A and the technical solution with the subject name B.
Claims
1. A mechanical key, characterized in that: include A key handle (1000), the key handle (1000) having an unlocking end (1100), the unlocking end (1100) being used to connect to a lock core shaft (4101) of a manhole cover locking device; A magnetic member (2100), wherein the magnetic member (2100) is arranged at the unlocking end (1100), and the magnetic member (2100) attracts the second clutch shaft (4202) of the manhole cover locking device in a magnetic manner so that the second clutch shaft (4202) moves in a direction parallel to the axial direction of the lock core shaft (4101).
2. The mechanical key according to claim 1, characterized in that: The unlocking end (1100) is provided with a cylindrical cavity (1101), and the cylindrical cavity (1101) is used to be sleeved on the end of the lock core shaft (4101), and the magnetic attraction member (2100) is arranged in the cylindrical cavity (1101).
3. The mechanical key according to claim 2, characterized in that: The mechanical key comprises a movable rod (2200), wherein the movable rod (2200) is arranged in the cylindrical cavity (1101), and the magnetic attraction part (2100) is arranged at the end of the movable rod (2200). The movable rod (2200) can move back and forth in the cylindrical cavity (1101), and when the unlocking end (1100) is connected to the lock core shaft (4101), the movable rod (2200) retreats in the cylindrical cavity (1101) so that the cylindrical cavity (1101) is sleeved on the end of the lock core shaft (4101).
4. The mechanical key according to claim 3, characterized in that: The mechanical key comprises an elastic member (2300), wherein the elastic member (2300) is sleeved on the outer side of the movable rod (2200), and the two ends of the elastic member (2300) respectively abut against the inner wall of the cylindrical cavity (1101) and the movable rod (2200), and when the movable rod (2200) retreats in the cylindrical cavity (1101), the elastic member (2300) is compressed and has compressive elastic potential energy.
5. The mechanical key according to any one of claims 2 to 4, characterized in that: The inner side wall of the cylindrical cavity (1101) is engaged with the lock core shaft (4101) so that the key handle (1000) can rotate the lock core shaft (4101).
6. The mechanical key according to claim 5, characterized in that: The cross section of the cylindrical cavity (1101) is formed into a regular polygon or a plum blossom shape.
7. The mechanical key according to claim 5, characterized in that: The outer side surface of the unlocking end (1100) is provided with an annular limiting portion (1201). After the key handle (1000) is connected to the lock core shaft (4101) and rotated, the annular limiting portion (1201) abuts against the inner wall of the lock shell to prevent the mechanical key from being separated from the manhole cover locking device.
8. The mechanical key according to claim 1, characterized in that: The mechanical key comprises a handle (3000), and the handle (3000) is arranged on an end of the key handle (1000) away from the unlocking end (1100).
9. The mechanical key according to claim 8, characterized in that: The handle (3000) is configured as a rod-shaped structure perpendicular to the axial direction of the key handle (1000).
10. A manhole cover locking device, characterized in that: The manhole cover locking device is unlocked by a mechanical key as described in any one of claims 1 to 9.