CN212389158U - Anti-theft lock core and well lid with same - Google Patents

Abstract

The utility model is suitable for the field of locks, and discloses an anti-theft lock core and a well lid with the anti-theft lock core, wherein the anti-theft lock core comprises a lock core shell and a lock liner part which is provided with a lock hole and is rotationally connected in the lock core shell, and a marble mechanism matched with a key and a side hole which is used for accommodating the marble mechanism and is communicated with the lock hole are arranged between the lock core shell and the lock liner part; the pin tumbler mechanism comprises a locking pin tumbler and a safety pin tumbler, wherein the end part of the locking pin tumbler can extend into the lock hole and can slide in the side hole, the locking pin tumbler can limit the rotation of the lock cylinder component and can slide to a set position along the side hole to relieve the limitation of the lock cylinder component, and the safety pin tumbler can slide to a set position along the side hole to limit the rotation of the lock cylinder component. Well lid includes the well lid body and sets up the above-mentioned theftproof lock core on the well lid body. The utility model provides a pair of theftproof lock core and have well lid of this theftproof lock core, it can prevent effectively that the well lid from being inserted the back unblock by cylindric object interference, and the theftproof performance is good.

Description

Anti-theft lock core and well lid with same

Technical Field

The utility model belongs to the tool to lock field especially relates to an theftproof lock core and have well lid of this theftproof lock core.

Background

At present, a tap water pipeline, a communication cable and the like are usually laid underground through an underground pipe network, and a vertical shaft is arranged on the ground, so that the laying and the maintenance of the cable or the pipeline are facilitated. For the sake of safety, a well cover connected through hinges is arranged on a well mouth of the vertical shaft, and a lock is usually arranged on the well cover to lock the well cover conveniently, so that a lawbreaker is prevented from stealing and damaging the well cover and facilities in the vertical shaft privately.

The well lid lock structure in the prior art generally adopts a pin tumbler structure, and the pin tumbler structure is used for unlocking and locking the well lid lock, namely when a key is inserted for unlocking, the pin tumblers are completely retracted due to the extrusion of the key, so that the key can rotate the well lid lock to realize unlocking. For the manhole cover lock, a lawless person uses a self-made unlocking tool to stir all the marbles to retract to an unlocking position for unlocking, even some locks use cylindrical objects such as reinforcing steel bars and screwdrivers to be inserted in an interference mode to unlock the manhole cover, and the anti-theft performance is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving one of above-mentioned technical problem at least, provides an theftproof lock core and has well lid of this theftproof lock core, and it can prevent effectively that the well lid from being inserted the back unblock by cylindric object interference, and the theftproof performance is good.

The technical scheme of the utility model is that: an anti-theft lock core comprises a lock core shell and a lock core component which is provided with a lock hole and is rotationally connected in the lock core shell, wherein a pin tumbler mechanism matched with a key and a side hole which is used for accommodating the pin tumbler mechanism and is communicated with the lock hole are arranged between the lock core shell and the lock core component; the pin tumbler mechanism comprises a locking pin tumbler and a safety pin tumbler, one end part of the locking pin tumbler can extend into the lock hole and can slide in the side hole, the locking pin tumbler can limit the rotation of the lock cylinder component and can slide to a set position along the side hole to release the limitation on the lock cylinder component, and the safety pin tumbler can slide to a set position along the side hole to limit the rotation of the lock cylinder component; the side holes are at least provided with two groups, and the locking pins and the safety pins are respectively positioned in different side holes.

Optionally, two groups of the side holes are arranged, each group of the side holes includes a first side hole arranged in the cylinder liner component and a second side hole arranged in the cylinder plug shell, the first side hole is a through hole and can rotate along with the cylinder liner component to be communicated with the second side hole, and the locking pin and the safety pin are arranged in different first side holes; the spring mechanism further comprises an elastic part arranged in each second side hole, a safety auxiliary spring arranged in the second side hole and connected with the elastic part and abutted against the safety spring, and a locking auxiliary spring arranged at the junction of the first side hole and the other second side hole and connected with the elastic part and abutted against the locking spring.

Optionally, the axial direction length of the safety pin is greater than the first lateral hole length.

Optionally, the other end of the safety pin is flush with the outer wall of the cylinder part;

or one end of the safety auxiliary marble, which abuts against the safety marble, is a curved surface or an inclined surface, and the curved surface or the inclined surface of the end of the safety marble is positioned at the junction of the first side hole and the second side hole.

Optionally, the length of the locking pin in the axial direction does not exceed the length of the first side hole, one end of the locking auxiliary pin abutting against the locking pin is an inclined surface or a curved surface, and the curved surface or the inclined surface of the end of the locking auxiliary pin is located in the first side hole in the locking state; the inclined surface or the curved surface of the end of the locking auxiliary marble is positioned at the junction of the first side hole and the second side hole in the unlocking state, or at least one part of the inclined surface or the curved surface of the end of the locking auxiliary marble is positioned in the second side hole in the unlocking state.

Optionally, a port of the first side hole close to the lock hole is provided with a limiting structure for limiting the safety pin or the locking pin to be separated from the first side hole, and the limiting structure includes a necking structure integrally formed in the first side hole; or, the limiting structure comprises an annular insert fixedly connected to the first side hole.

Optionally, the end of the auxiliary pin abutting against the locking pin or the safety pin is a curved surface or an inclined surface.

Optionally, a waterproof gasket is disposed between the cylinder core component and the cylinder core housing.

Optionally, the lock hole is a through hole penetrating through the lock cylinder component.

Optionally, the lock liner part is connected with a drain pipe communicated with the lock hole, and the drain pipe is fixedly connected with the shifting piece.

The utility model also provides a well lid, including well lid body and above-mentioned theftproof lock core, the theftproof lock core set up in the well lid body.

When cylindrical foreign matters are inserted into the lock hole in an interference manner, the safety marble is pressed to slide into the side hole and limits the rotation of the lock cylinder component, at the moment, the foreign matters cannot rotate the lock cylinder component, and the anti-theft effect is good; when the key is inserted, the key is provided with a corresponding clearance structure, so that the key cannot extrude the safety pin tumbler and the rotation of the lock cylinder component is not influenced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a transverse sectional view of an anti-theft lock cylinder provided in an embodiment of the present invention;

fig. 2 is a transverse sectional view of a key inserted into an anti-theft lock cylinder provided in an embodiment of the present invention;

fig. 3 is a transverse cross-sectional view of the anti-theft lock cylinder provided by the embodiment of the present invention after the foreign matter is inserted;

fig. 4 is a longitudinal sectional view of an anti-theft lock cylinder provided in an embodiment of the present invention;

fig. 5 is a longitudinal sectional view of another view angle of the anti-theft lock cylinder according to the embodiment of the present invention.

In the figure:

1. a lock cylinder housing; 11. a waterproof gasket; 12. a fixing plate; RFID chip;

2. a cylinder member; 21. a lock hole; 22. a card slot; 23. a blow-off pipe; 24. a shifting sheet;

31. a safety marble; 32. locking the marble; 33. safety auxiliary marbles; 34. locking the auxiliary pin tumbler; 35. an elastic member; 36. a plug; 37. a first side hole; 38. a second side hole;

4. a key; 41. a void-avoiding structure;

5. a foreign object.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, directly disposed or connected, or indirectly disposed or connected through intervening elements or intervening structures.

In addition, in the embodiments of the present invention, if there are terms of orientation or positional relationship indicated by "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., it is based on the orientation or positional relationship shown in the drawings or the conventional placement state or use state, and it is only for convenience of description and simplification of the description, but does not indicate or imply that the structures, features, devices or elements referred to must have a specific orientation or positional relationship, nor must be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The various features and embodiments described in the detailed description may be combined in any suitable manner, for example, different embodiments may be formed by combining different features/embodiments, and various combinations of features/embodiments are not separately described in order to avoid unnecessary repetition in the present disclosure.

As shown in fig. 1 to 5, an embodiment of the present invention provides an anti-theft lock core, which includes a lock core housing 1 and a lock core component 2 having a lock hole 21 and rotatably connected to the lock core housing 1, a pin tumbler mechanism adapted to a key 4 and a side hole (37, 38) for accommodating the pin tumbler mechanism and communicating with the lock hole 21 are disposed between the lock core housing 1 and the lock core component 2, the key 4 is inserted into the lock hole 21 and then the pin tumbler mechanism is released from limiting the lock core component 2, and the lock core component 2 can rotate relative to the lock core housing 1 under the driving of the key 4; the pin tumbler mechanism comprises locking pin tumblers 32 and safety pin tumblers 31, the end parts of which can extend into the lock hole 21 and can slide in the side holes, at least two groups of side holes are arranged, and the locking pin tumblers 32 and the safety pin tumblers 31 are respectively positioned in different side holes; in a locking state, the locking pin 32 can limit the rotation of the cylinder part 2, and when the end part of the locking pin 32 is extruded, the locking pin can slide to a set position along the side hole to release the limitation on the cylinder part 2; the safety pin 31 does not affect the rotation of the cylinder member 2 in a natural state, and when the end of the safety pin 31 is pressed, it can slide to a set position along the side hole to restrict the rotation of the cylinder member 2. When someone inserts a cylindrical foreign body 5 such as a steel bar or a screwdriver into the lock hole 21 and tries to rotate the cylinder part 2, the safety pin 31 slides into the side hole under the extrusion of the foreign body 5 and limits the relative rotation of the cylinder part 2 and the cylinder shell 1, thereby realizing the anti-theft effect of the anti-theft lock cylinder.

In this embodiment, the lock cylinder housing 1 is cylindrical, and in other specific embodiments, the lock cylinder housing 1 may be rectangular or have other shapes.

In specific application, the number of the side holes can be determined according to the number of the safety marbles 31 and the locking marbles 32, the safety marbles 31 and the locking marbles 32 can not be located at the same height, the number of the side holes corresponds to that of the safety marbles 31 and the locking marbles 32 one by one, and at least one safety marbles 31 and at least one locking marbles 32 are respectively arranged. In this embodiment, the safety pin 31 and the locking pin 32 are respectively provided with one pin and are located at the same height, but in other embodiments, two or more pins 31 and 32 may be respectively provided and may have the same or different heights.

Specifically, as shown in fig. 1, two sets of side holes are provided, each set of side hole includes a first side hole 37 disposed in the cylinder part 2 and a second side hole 38 disposed in the plug housing 1, the first side hole 37 is a through hole and can rotate with the cylinder part 2 to communicate with the second side hole 38, and the locking pin 32 and the safety pin 31 are disposed in different first side holes 37; the pin tumbler mechanism further comprises auxiliary pins (33, 34) which are arranged in the second side hole 38 or at the junction of the second side hole 38 and the first side hole 37, and an elastic element 35 which is connected with the auxiliary pins and can push the auxiliary pins against the locking pin 32 or the safety pin 31. For convenience of explanation, the auxiliary pin connected to the locking pin 32 is defined as a locking auxiliary pin 34, and the auxiliary pin connected to the safety pin 31 is defined as a safety auxiliary pin 33. When the end of the safety pin 31 is pressed, the other end of the safety pin 31 will abut against the safety auxiliary pin 33 and compress the elastic element 35 to move toward the second side hole 38, so that the safety pin 31 is clamped at the boundary of the first side hole 37 and the second side hole 38, and after the pressing is lost, the safety pin 31 will return to the first side hole 37 again under the action of the elastic element 35 and the safety auxiliary pin 33. Similarly, the latch 32 is pressed against the latch auxiliary pin 34 and compresses the resilient member 35 to move toward the second side hole 38, so that the latch auxiliary pin 34 slides into the second side hole 38 completely or mostly, and the latch 32 and the latch auxiliary pin 34 are restored after the pressing is lost.

In a specific application, the diameters of the first side hole 37 and the second side hole 38 may be the same, and when the first side hole 37 is rotated to communicate with the second side hole 38, the axial centers of the first side hole 37 and the second side hole 38 may be in the same straight line. In this embodiment, as shown in fig. 1, the second side hole 38 may be a through hole and the outer end portion far from the second side hole 38 is blocked by the plug 36, so as to prevent the liquid or the foreign material 5 from penetrating into the lock cylinder and affecting the use of the lock cylinder. Of course, in a specific application, the second side hole 38 may be a blind hole.

Specifically, as shown in fig. 1, the axial length of the safety pin 31 is greater than the length of the first side hole 37, and the other end of the safety pin 31 is flush with the outer wall of the cylinder member 2 and abuts against the auxiliary pin (i.e., the safety auxiliary pin 33) located in the second side hole 38.

Specifically, as shown in fig. 1, the axial length of the locking pin 32 does not exceed the length of the second side hole 38, and the other end of the locking pin 32 abuts against an auxiliary pin (i.e., the locking auxiliary pin 34) located at the boundary between the first side hole 37 and the second side hole 38.

Referring to fig. 1, in the initial locking state, the locking auxiliary pin 34 is located at the intersection of the first side hole 37 and the second side hole 38, in this embodiment, the locking auxiliary pin 34 is a steel ball, and the excessive half volume of the locking auxiliary pin 34 is located in the first side hole 37, that is, the volume of the locking auxiliary pin 34 in the first side hole 37 is greater than the volume of the second side hole 38, in a specific application, the position of the locking auxiliary pin 34 may be set according to the shape and size of the locking auxiliary pin 34, for example, when the locking auxiliary pin 34 is a steel column, the locking auxiliary pin 34 does not need to be located in the first side hole 37 by the excessive half volume, and only needs to be able to limit the relative rotation between the cylinder member 2 and the cylinder shell 1, for example, the end of the steel column opposing the locking pin 32 is an inclined surface or a curved surface, and the inclined surface is located in the first side hole 37 in the locking state, and the curved surface or the inclined surface of the end of the locking auxiliary pin 34 (i.e., the At least a portion of the slope or curve of the end of the auxiliary locking pin 34 (i.e., the end abutting the locking pin 32) at the intersection of the side hole 37 and the second side hole 38 is located in the second side hole, so that the end of the rotary cylinder core 2 is pressed, and the auxiliary locking pin 34 moves toward the second side hole 38 due to the slope or curve of the end, so as not to interfere with the rotation of the cylinder core 2. At this time, the safety pin 31 is located in the first side hole 37, the safety auxiliary pin 33 is located in the second side hole 38, and the other end portion (the end close to the safety auxiliary pin 33) of the safety pin 31 in this embodiment is flush with the outer wall of the cylinder member 2, of course, in other embodiments, one end of the safety auxiliary pin 33 abutting against the safety pin 31 may be a curved surface (including a spherical surface) or an inclined surface, and the end portion may partially extend into the first side hole 37 (i.e., the end portion is located at the boundary between the first side hole and the second side hole), and when the cylinder member 2 rotates, the end portion, which is curved surface or inclined surface, is squeezed and moves toward the second side hole 38, so that the rotation of the cylinder member 2 is not interfered. It is understood that, as shown in fig. 1, in the latched state, the latching pin 32 and the latching auxiliary pin 34 restrict the rotation of the cylinder member 2, while the securing pin 31 and the securing auxiliary pin 33 do not affect the rotation of the cylinder member 2. Referring to fig. 2, when the key 4 is inserted into the lock hole 21, the key 4 will press the locking pin 32 to extend into the end of the lock hole 21 and retract into the first side hole 37, the locking pin 32 retracts into the first side hole 37 and simultaneously pushes the locking auxiliary pin 34 into the second side hole 38 completely or mostly, so that the rotation (i.e. the unlocking state) of the cylinder part 2 is no longer affected by the locking pin 32 and the locking auxiliary pin 34, and a clearance structure 41, such as a groove, a through hole or a blind hole for accommodating the end of the safety pin 31, is disposed on the key 4 relative to the safety pin 31, and when the key 4 is inserted in place, the clearance structure 41 will avoid the safety pin 31 and the safety auxiliary pin 33, so that the states of the safety pin 31 and the safety auxiliary pin 33 are not changed, the safety pin 31 is located in the first side hole 37, the safety auxiliary pin 33 is located in the second side hole 38, i.e. the rotation of the safety pin 31 and the, at the moment, the key 4 can drive the lock cylinder component 2 to rotate relative to the lock cylinder shell 1, so that unlocking is realized. Referring to fig. 3, when a foreign object 5 is used to be inserted into the lock hole 21 in an interference manner, the ends of the locking pin 32 and the safety pin 31 are simultaneously pressed by the foreign object 5, so that both are retracted into the first side hole 37, and retracted into the first side hole 37 while pressing the locking auxiliary pin 34 and the safety auxiliary pin 33, respectively, so that the locking auxiliary pin 34 is completely or mostly slid into the second side hole 38, and the safety pin 31 is slid towards the second side hole 38 and clamped at the boundary of the first side hole 37 and the second side hole 38, so that the cylinder part 2 cannot be rotated, and thus the lock cylinder cannot be rotated in an interference insertion manner.

Specifically, as shown in fig. 1, a limit structure for limiting the safety pin 31 or the locking pin 32 from disengaging from the first side hole 37 is disposed at a port of the first side hole 37 close to the lock hole 21, and the limit structure includes a necking structure (not identified in the figure) integrally formed on the first side hole 37. The end parts of the safety marble 31 and the locking marble 32 extending into the lock hole 21 are curved surfaces or inclined surfaces, that is, the diameter of the end parts is relatively small, so that the necking structure can prevent the safety marble 31 and the locking marble 32 from completely separating from the first side hole 37 while the safety marble 31 and the locking marble 32 extend into the lock hole 21, and the reliability of the anti-theft lock cylinder is improved. In a specific application, the first side hole 37 may be a stepped hole, i.e. the diameter near the end of the lock hole 21 is small, or the end of the first side hole 37 may be tapped to form a necking structure. Of course, it may be integrally formed by a metal casting or die casting process.

In particular, as an alternative to this embodiment, the limit structure may comprise an annular insert fixedly connected to the first lateral hole 37. In a specific application, the first side hole 37 may be a through hole, and an annular insert is fixedly connected to a port close to the lock hole 21 by screwing, welding, interference fit, or the like.

Specifically, as shown in fig. 2, the end of the auxiliary locking pin 32 or the safety pin 31 is curved (including spherical) or inclined, that is, the end of the auxiliary locking pin 34 is curved (including spherical) or inclined. Thus, after the key 4 is inserted into the lock hole 21, the locking pin 32 only needs to push most of the locking auxiliary pin 34 into the second side hole 38, so that one end of the locking auxiliary pin 34, which is curved, is located at the junction of the first side hole 37 and the second side hole 38, when the cylinder part 2 rotates, the end of the curved end is pressed by the cylinder part 2, so that the locking auxiliary pin 34 moves into the second side hole 38, and the cylinder part 2 can rotate with the lock cylinder shell 1 without pushing the locking auxiliary pin 34 into the second side hole 38 completely.

In this embodiment, as shown in fig. 1, the safety pin 31 and the safety auxiliary pin 33 are both steel columns, one end of the safety pin 31 close to the lock hole 21 is a curved surface (or a hemispherical surface), and the locking pin 32 and the locking auxiliary pin 34 are both steel balls. In a specific application, the safety pin 31, the safety auxiliary pin 33, the locking pin 32, and the locking auxiliary pin 34 may be steel columns, steel balls, or other shapes, and may also be rugby balls, spindle shapes, or the like, which is not limited by the present invention.

Specifically, as shown in fig. 4, a waterproof gasket 11 is disposed between the cylinder assembly 2 and the cylinder housing 1, so as to prevent liquid or impurities from falling between the cylinder assembly 2 and the cylinder housing 1, and ensure smooth rotation between the cylinder assembly 2 and the cylinder housing 1. In this embodiment, the waterproof gaskets 11 are disposed at the upper end of the lock cylinder component 2 connected to the lock cylinder housing 1 and at positions close to the lower end, so as to increase the reliability of the anti-theft lock cylinder. In a specific application, the position and the number of the waterproof gaskets 11 can be selected according to actual requirements, and one or more waterproof gaskets can be arranged.

Specifically, as shown in fig. 4 and 5, the lock hole 21 is a through hole penetrating through the cylinder member 2, so that the liquid and the sundries falling into the lock hole 21 can be discharged out of the anti-theft lock cylinder through the lock hole 21, the influence on the use of the anti-theft lock cylinder due to the accumulation of the sundries in the lock hole 21 is avoided, and the practicability is good.

In a specific application, the shape of the locking hole 21 may be circular, rectangular or other shapes. In this embodiment, as shown in fig. 2, the keyhole 21 is circular, and a slot 22 adapted to the key 4 is disposed on an inner wall of the keyhole 21, and the slot 22 can be matched with the key 4, so that the key 4 can have a stress point on the inner wall of the cylinder part 2, and the cylinder part 2 can be rotated. In a specific application, the card slot 22 may be a V-shaped or U-shaped slot, and two or more card slots 22 may be provided.

Specifically, as shown in fig. 4, an RFID chip 13 (Radio Frequency Identification ) may be disposed at the top of the lock hole 21, and a specific code is stored in the RFID chip 13, so that only when the information stored in the inserted key 4 matches with the coded information in the RFID chip 13, the unlocking operation can be performed, which is beneficial to improving the security of the lock cylinder. In the concrete application, can also set up the apron that is used for hiding lockhole 21 at the top of lock core shell 1, when the unblock needs, can lift the apron and carry out the unblock again, improve the aesthetic property and the security of lock core to a certain extent.

Specifically, as shown in fig. 4, a drain pipe 23 communicating with the lock hole 21 is connected to the cylinder member 2. The length and the size of the sewage discharge pipe 23 can be selected according to actual conditions, and can be coaxially arranged with the lock hole 21, and the diameter can also be the same as that of the lock hole 21. In specific application, the drainage pipe 23 can be integrally formed on the lock cylinder component 2, and can also be fixedly connected to the lock cylinder component 2.

Specifically, as shown in fig. 4, the cylinder member 2 is connected to a pulling piece 24, and the pulling piece 24 is fixedly connected to the drain pipe 23. When the lock cylinder part 2 rotates, the blow-off pipe 23 can be driven to rotate along with the lock cylinder part, so that the shifting piece 24 connected to the blow-off pipe 23 rotates to different positions, and the lock is unlocked.

In the present embodiment, as shown in fig. 4, in order to achieve the connection stability between the cylinder core housing 1 and the cylinder core member 2, after the cylinder core member 2 is inserted into the bottom of the cylinder core housing 1, the fixing plate 12 is fixedly mounted on the bottom of the cylinder core housing 1 by a fastener, so that the cylinder core member 2 and the cylinder core housing 1 are more reliably connected.

The utility model also provides a well lid, including well lid body and above-mentioned theftproof lock core, the theftproof lock core sets up in the well lid body. The theftproof lock core can prevent effectively that the well lid from being stolen to compare among the prior art well lid that the pellet shot from a slingshot structure all was used for unblocking, the embodiment of the utility model provides a well lid can also prevent that it from being rotated by interference male mode, can also improve the life of well lid through lockhole 21 and blow off pipe 23 simultaneously.

When a cylindrical foreign matter 5 is inserted into the lock hole 21 in an interference manner, the safety marble 31 is pressed to slide in the side hole and limit the rotation of the lock cylinder part 2, at the moment, the foreign matter 5 cannot rotate the lock cylinder part 2, and the anti-theft effect is good; when the key 4 is inserted, the key 4 does not press the safety pin 31 and the rotation of the cylinder part 2 is not affected because the corresponding clearance structure 41 is arranged on the key 4.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.

Claims (10)

1. An anti-theft lock core comprises a lock core shell and a lock core component which is provided with a lock hole and is rotationally connected in the lock core shell, and is characterized in that a pin tumbler mechanism matched with a key and a side hole which is used for accommodating the pin tumbler mechanism and is communicated with the lock hole are arranged between the lock core shell and the lock core component; the pin tumbler mechanism comprises a locking pin tumbler and a safety pin tumbler, one end part of the locking pin tumbler can extend into the lock hole and can slide in the side hole, the locking pin tumbler can limit the rotation of the lock cylinder component and can slide to a set position along the side hole to release the limitation on the lock cylinder component, and the safety pin tumbler can slide to a set position along the side hole to limit the rotation of the lock cylinder component; the side holes are at least provided with two groups, and the locking pins and the safety pins are respectively positioned in different side holes.

2. The anti-theft lock core according to claim 1, wherein there are two sets of said side openings, and each set of said side openings comprises a first side opening disposed in said cylinder member and a second side opening disposed in said cylinder housing, said first side opening is a through opening and is rotatable with said cylinder member to communicate with said second side opening, said locking pins and said safety pins are disposed in different first side openings; the spring mechanism further comprises an elastic piece arranged in each second side hole, a safety auxiliary spring arranged in the second side hole and abutting against the other end part of the safety spring through the elastic piece, and a locking auxiliary spring arranged at the junction of the first side hole and the other second side hole and abutting against the other end part of the locking spring through the elastic piece.

3. An anti-theft lock cylinder according to claim 2, wherein said safety pin has an axial length greater than the length of said first side opening.

4. An anti-theft lock core according to claim 2, wherein the other end of said safety pin is flush with the outer wall of said cylinder member;

or one end of the safety auxiliary marble, which abuts against the safety marble, is a curved surface or an inclined surface, and the curved surface or the inclined surface of the end of the safety auxiliary marble is positioned at the junction of the first side hole and the second side hole.

5. The anti-theft lock core according to claim 2, wherein the axial length of said locking pin does not exceed the length of said first side opening, the end of said locking auxiliary pin abutting against said locking pin is curved or inclined, and the curved or inclined surface of said end of said locking auxiliary pin in the locked state is located in said first side opening; the curved surface or the inclined surface of the end of the locking auxiliary marble is positioned at the junction of the first side hole and the second side hole in the unlocking state, or at least one part of the curved surface or the inclined surface of the end of the locking auxiliary marble is positioned in the second side hole in the unlocking state.

6. The anti-theft lock core according to claim 2, wherein a limit structure for limiting the safety pin or the locking pin from disengaging from the first side hole is disposed at a port of the first side hole close to the lock hole, and the limit structure comprises a necking structure integrally formed in the first side hole; or, the limiting structure comprises an annular insert fixedly connected to the first side hole.

7. The anti-theft lock core according to claim 2, wherein the end of said auxiliary pin abutting against said locking pin or said safety pin is curved or inclined.

8. The anti-theft lock cylinder according to any one of claims 1 to 7, wherein said lock hole is a through hole penetrating said cylinder member.

9. The anti-theft lock core according to claim 8, wherein the lock core component is connected with a drain pipe communicated with the lock hole, and the drain pipe is fixedly connected with a shifting piece.

10. A manhole cover comprising a manhole cover body, characterized in that it is provided with an anti-theft lock cylinder as claimed in any one of claims 1 to 9.

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