CN109322558B

CN109322558B - Electronic key and anti-theft lock matched with same

Info

Publication number: CN109322558B
Application number: CN201811492935.0A
Authority: CN
Inventors: 何微; 镇方雄; 镇方超; 徐世利; 谢子鸣; 李干明; 许炎鑫
Original assignee: Hubei University of Science and Technology
Current assignee: Hubei University of Science and Technology
Priority date: 2018-12-07
Filing date: 2018-12-07
Publication date: 2023-09-22
Anticipated expiration: 2038-12-07
Also published as: CN109322558A

Abstract

The invention provides an electronic key and an anti-theft lock matched with the electronic key, and belongs to the technical field of electromechanics. The anti-theft lock comprises a lock core, wherein the electronic key comprises a cylindrical plug and a locking mechanism arranged in the plug, the locking mechanism comprises a magnetic coil, the lock core comprises a plug barrel, the plug can be inserted in the plug barrel, a power supply and an indicator light connected with the power supply in series are arranged in the plug, a plurality of rotary drums are arranged on the plug, two wiring contacts are arranged on the peripheral surface of each rotary drum, an annular control area corresponding to each rotary drum one by one is arranged on the inner wall of the plug barrel, a group of true contacts and a plurality of groups of false contacts are arranged on each control area, the true contacts comprise two conducting contacts, and the two conducting contacts are electrically connected; each group of false contacts comprises two short-circuit contacts; the conducting contacts and the short-circuit contacts on the same control area are circumferentially and uniformly distributed. The invention has the advantages of high safety and the like.

Description

Electronic key and anti-theft lock matched with same

Technical Field

The invention belongs to the technical field of electromechanics, and relates to an electronic key and an anti-theft lock matched with the electronic key.

Background

Locks are tool products which are contacted with people in daily life, are widely applied to various industries, as the life quality of people is gradually improved, more locks are in families, more keys are available, the keys are inconvenient to lose, and more keys are inconvenient.

The existing lock is realized through a mechanical structure, and also has an electronic lock, such as a fingerprint lock and the like, the existing mechanical lock enables a door frame and a door body to be blocked through a lock tongue, a thief can open the door body where a lock core is located or the door frame where the lock core is located by destroying the door body, and the lock is inserted into a door slot through a card with a sheet structure, so that the lock tongue can be retracted and opened, and in a word, the safety is lower.

The existing electronic locks of fingerprint locks have the defects that if a power supply needs to be connected, the power supply is cut off or the power supply fails, and the like are troublesome.

Disclosure of Invention

The invention aims to solve the problems of the prior art and provide an electronic key and an anti-theft lock matched with the electronic key, and the technical problem to be solved by the invention is to improve the reliability by arranging a power supply on the key and unlocking the key and a lock cylinder in a power-on mode.

The aim of the invention can be achieved by the following technical scheme: the electronic key comprises a cylinder-shaped plug and a locking mechanism arranged in the plug, the locking mechanism comprises a magnetic coil, the plug comprises a plug barrel, the plug can be inserted in the plug barrel, a power supply and an indicator light connected in series with the power supply are arranged in the plug, a plurality of rotary drums are arranged on the plug, two wiring contacts are arranged on the peripheral surface of each rotary drum, annular control areas corresponding to the rotary drums one by one are arranged on the inner wall of the plug barrel, a set of true contacts and a plurality of false contacts are arranged on each control area, each true contact comprises two conducting contacts, and the two conducting contacts are electrically connected; each group of the dummy contacts comprises two short-circuit contacts; each conducting contact and each short-circuit contact on the same control area are circumferentially and uniformly distributed; when the key is matched with the lock core, the two wiring contacts on each rotary drum are communicated with the two conduction contacts on the corresponding control area, and the power supply, the indicator light and the magnetic coil form a complete electric reflux; two short-circuit contacts on each group of false contacts are respectively connected with two ends of the magnetic force coil; when any false contact corresponds to the wiring contact, the magnetic coil is in a short circuit or disconnection state.

The specific wiring mode under the conduction condition of the magnetic coil is as follows: the following electrical components are connected in series: the device comprises a power supply, an indicator lamp, two wiring contacts on the innermost rotary drum, two conduction contacts corresponding to the innermost rotary drum, a magnetic coil, two wiring contacts of the outermost rotary drum, two conduction contacts corresponding to the outermost rotary drum, two wiring contacts on each rotary drum between the innermost rotary drum and the outermost rotary drum, and each conduction contact corresponding to each rotary drum between the innermost rotary drum and the outermost rotary drum.

When any false contact corresponds to the wiring contact, the magnetic coil is disconnected, or the power supply is short-circuited by the wiring contact and the conducting contact, so that the magnetic coil cannot be electrified, and the lock cylinder cannot be opened.

The key and the lock can be in one-to-one correspondence through the arrangement of the true contact and the false contact on the lock core and the arrangement of the conducting wiring contact on the plug.

The lock core is opened by the magnetic coil in a plurality of ways, such as a magnetic field is formed after the magnetic coil is electrified, the inserting tongue for adsorbing the locking of the door frame and the door body is separated from the jack, unlocking is realized, and after the magnetic coil is powered off, the inserting tongue is reset under the action of elastic members such as springs, so that the locking of the door frame and the door body is realized.

The two ends of the power supply are also provided with charging connectors.

In the electronic key and the anti-theft lock matched with the electronic key, the plug comprises the leading-in part and the handle part, and each rotary drum is positioned between the leading-in part and the handle part.

In the electronic key and the anti-theft lock matched with the electronic key, the guiding part and the rotary drum are of external spline structures, and the inner wall of the plug cylinder is of an internal spline structure corresponding to the plug.

In the electronic key and the anti-theft lock matched with the electronic key, the guide-in part is provided with the positioning convex rib, and the inner wall of the insertion cylinder is provided with the positioning groove matched with the positioning convex rib.

In the electronic key and the anti-theft lock matched with the electronic key, the leading-in part and the handle part are fixedly connected through a stem, and each rotary drum is rotationally connected to the stem; a positioning component for limiting the stay position of the rotary drum after rotating on the core column is arranged between each rotary drum and the core column.

The positioning component is a steel ball arranged on the inner wall of the rotary drum and a notch corresponding to the steel ball arranged on the core column, and the steel ball is abutted by a pressure spring.

Because the rotating drums are rotating members, the adjacent rotating drum assemblies are electrically connected to form a conventional brush structure, and because the brush structure is a conventional means in the art, the description thereof will not be repeated.

The key with the structure can be used for unlocking a plurality of locks by one key by rotating the rotary drum to change the position of the wiring contact matched with the true contact, and can be used for centralized groups such as families, hotel managers and the like.

In the electronic key and the anti-theft lock matched with the electronic key, the leading-in part and the handle part are fixedly connected through a stem, and each rotary drum is fixedly connected to the stem.

The key with the structure can only unlock one lock, and belongs to a special key.

In the electronic key and the anti-theft lock matched with the electronic key, the locking mechanism further comprises an active lock structure arranged on the door body and a passive lock structure arranged on the door frame, the active lock structure comprises a first limiting frame, an active gear, an active lock tongue and an active rotating shaft, the first limiting frame is fixed in the door body, the active gear and the active lock tongue are both fixed on the active rotating shaft, two active lock tongues are arranged, the active gear is arranged between the two active lock tongues, the active rotating shaft is of a hollow structure, and the inserting cylinder is rotationally connected in the active rotating shaft;

the passive lock structure comprises a second limit frame, a passive gear, two passive lock bolts and a passive rotating shaft, wherein the second limit frame is fixed in a door frame, the two passive lock bolts are fixed on the passive rotating shaft, the two passive lock bolts are positioned between the two passive lock bolts, a transmission gear ring is arranged on the passive rotating shaft, an inner gear ring is arranged in the passive gear, a planetary gear capable of freely rotating is connected between the two passive lock bolts, and each planetary gear simultaneously engages the transmission gear ring and the inner gear ring; the driven gear can be meshed with the driving gear, and the driving spring bolt and the driven spring bolt are wedge-shaped; when the driving spring bolt is inserted into the second limit frame and the driven spring bolt is inserted into the first limit frame, the driving spring bolt and the driven spring bolt are symmetrically distributed; the driving spring bolt is connected with the first limiting frame through a plane bearing, and the driven spring bolt is connected with the second limiting frame through a plane bearing.

The lock with the structure can be in a locking state, the active lock tongue is inserted into the second limit frame on the door frame, the passive lock tongue is inserted into the first limit frame on the door body, the door body or the door frame is damaged independently, the door body or the door frame cannot be opened, and the anti-theft effect and the lock prying difficulty are greatly improved.

Through the action of the driven gear, the planetary gear, the transmission gear ring and the inner gear ring, when the driving gear and the driven gear are meshed for transmission, the rotation directions of the driving rotating shaft and the driven rotating shaft are the same, when the lock is opened, the driving lock tongue swings downwards, the driven lock tongue swings upwards, and therefore the driving lock tongue and the driven lock tongue cannot interfere with each other. This structure can also effectually avoid opening the possibility of lock through modes such as card, and the card can't be used in on the inclined plane of initiative spring bolt and passive spring bolt, and the pressure of being used in initiative spring bolt and passive spring bolt can't shake the position of initiative lock and passive spring bolt.

Furthermore, two side surfaces of the tooth on the driving gear are respectively provided with a first guide inclined surface, and two side surfaces of the tooth on the driven gear are respectively provided with a second guide inclined surface.

The side surface of the tooth means a side surface corresponding to the gear surface of the driving gear or the driven gear, so that the driving gear and the driven gear are smoothly meshed when the door body and the door frame are close.

In the electronic key and the anti-theft lock matched with the electronic key, the inner end of the driving rotating shaft is in threaded connection with a sliding block, an iron magnetic ring is arranged on the sliding block, an armature block is fixedly arranged at the inner end of the driving rotating shaft, and the magnetic coil is wound on the armature block; and a reset spring is connected between the sliding block and the inner wall of the driving rotating shaft.

After the magnetic coil is electrified, the armature block adsorbs the magnetic ring to enable the sliding block to move and drive the driving rotating shaft to rotate, so that the lock is unlocked.

Through the design of the structure and the cooperation of the travel of the sliding block and the threaded structure, when the sliding block is at two limit positions, the driving spring bolt is respectively located in a locking state and a separating state.

In the electronic key and the anti-theft lock matched with the electronic key, the sliding block is rotationally connected with the handle, the handle extends out of the inner side surface of the door body, the inner side surface of the door body is fixedly provided with the pull ring, and the handle is positioned at the inner side of the pull ring.

When the door is not closed, the handle is pulled, the pull ring is pressed, the sliding block is moved, the driving spring bolt and the driven spring bolt are driven to be abducted, the driving spring bolt is abducted firstly, and then the door body is folded towards the door frame.

In the electronic key and the anti-theft lock matched with the electronic key, a reset torsion spring is connected between the driven rotating shaft and the second limit frame, and the reset torsion spring drives the driven lock tongue to be located at a position away from the first limit frame under the action of external force of the driven gear.

Through structural parameter's design, make the passive spring bolt under reset torsional spring independent action be located limit frame two top, because the planetary transmission structure's between passive gear and the passive pivot exists, even the driving gear is the same with passive gear specification, the corner of driving spring bolt and passive spring bolt also can not keep unanimously, need cooperate through the position of driving spring bolt after unblanking, under two extreme positions of driving spring bolt promptly, the rotation of driving gear just makes the passive spring bolt be located the locking state respectively and break away from limit frame one's restriction state, the description of this section is just in order to explain the feasibility of this scheme, and make this scheme cover the scheme that has other parameter designs or equivalent structural design of above-mentioned function.

Drawings

Fig. 1 is a schematic circuit diagram of an electronic lock in accordance with a first embodiment.

Fig. 2 is a sectional view of the lock cylinder and plug in the first embodiment when the lock cylinder is unlocked in cooperation.

Fig. 3 is a schematic perspective view of a plug according to the first embodiment.

Fig. 4 is a schematic perspective view of a plug according to the second embodiment.

Fig. 5 is a sectional view of the door body and the door frame in the locked state in the first embodiment.

Fig. 6 is a schematic structural diagram of an active bolt and a passive bolt in the first embodiment.

Fig. 7 is a cross-sectional view in the direction A-A of fig. 5.

In the figure, 11, a cartridge; 12. a true contact; 121. conducting the contact; 13. a dummy contact; 131. a shorting contact; 2. a plug; 21. a power supply; 22. an indicator light; 23. a rotating drum; 24. a wiring contact; 25. an introduction unit; 26. a handle; 27. positioning the convex ribs; 31. a magnetic coil; 32. a first limiting frame; 33. a drive gear; 34. a driving bolt; 35. a driving rotating shaft; 41. a second limiting frame; 42. a driven gear; 43. a passive bolt; 44. a passive spindle; 45. a transmission gear ring; 46. an inner gear ring; 47. a planetary gear; 51. a magnetic ring is communicated; 52. an armature block; 53. a return spring; 54. a handle; 55. a pull ring; 56. a sliding block.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

Example 1

As shown in fig. 1, 2 and 3, the anti-theft lock comprises a lock core, an electronic key comprises a cylindrical plug 2 and a locking mechanism arranged in the plug 2, the locking mechanism comprises a magnetic coil 31, the lock core comprises a plug barrel 11, the plug 2 can be inserted into the plug barrel 11, a power supply 21 and an indicator light 22 connected in series with the power supply 21 are arranged in the plug 2, a plurality of rotary drums 23 are arranged on the plug 2, two wiring contacts 24 are arranged on the peripheral surface of each rotary drum 23, annular control areas corresponding to the rotary drums 23 one by one are arranged on the inner wall of the plug barrel 11, a group of true contacts 12 and a plurality of false contacts 13 are arranged on each control area, the true contacts 12 comprise two conducting contacts 121, and the two conducting contacts 121 are electrically connected; each set of dummy contacts 13 comprises two shorting contacts 131; the conducting contacts 121 and the short-circuit contacts 131 on the same control area are uniformly distributed in the circumferential direction; when the key is matched with the lock cylinder, the two wiring contacts 24 on each rotary cylinder 23 are communicated with the two conduction contacts 121 on the corresponding control area, and the power supply 21, the indicator light 22 and the magnetic coil 31 form a complete electric reflux; the two short-circuit contacts 131 on each group of dummy contacts 13 are respectively connected with the two ends of the magnetic coil 31; when any dummy contact 13 is made to correspond to the wiring contact 24, the magnetic coil 31 is in a short-circuited or open state.

The specific wiring mode in the case of conducting the magnetic coil 31 is as follows: the following electrical components are connected in series: the power source 21, the indicator light 22, the two connection contacts 24 on the innermost drum 23, the two conduction contacts 121 corresponding to the innermost drum 23, the magnetic coil 31, the two connection contacts 24 of the outermost drum 23, the two conduction contacts 121 corresponding to the outermost drum 23, the two connection contacts 24 on each drum 23 between the innermost and outermost ends, and the respective conduction contacts 121 corresponding to each drum 23 between the innermost and outermost ends.

When any dummy contact 13 corresponds to the wire contact 24, the magnetic coil 31 is disconnected, or the power supply 21 is short-circuited by the wire contact 24 and the conductive contact 121, so that the magnetic coil 31 cannot be energized, and the lock cylinder cannot be opened.

The one-to-one correspondence of the key and the lock can be realized by the arrangement of the true contact 12 and the false contact 13 on the lock core and the arrangement of the conducting wiring contact 24 on the plug 2.

The magnetic coil 31 is used for unlocking the lock core in a plurality of ways, such as a magnetic field is formed after the magnetic coil 31 is electrified, the inserting tongue for adsorbing and locking the door frame and the door body is separated from the jack, unlocking is realized, and after the magnetic coil 31 is powered off, the inserting tongue is reset under the action of elastic members such as springs, so that locking of the door frame and the door body is realized.

The power supply 21 also has a charging connector at both ends.

The plug 2 includes an introduction portion 25 and a shank portion 26, and each drum 23 is located between the introduction portion 25 and the shank portion 26. The lead-in part 25 and the rotary drum 23 are both of external spline structures, and the inner wall of the insertion tube 11 is of an internal spline structure corresponding to the plug 2. The guide portion 25 has a positioning rib 27, and the inner wall of the insertion tube 11 has a positioning groove that mates with the positioning rib 27.

The leading-in part 25 and the handle part 26 are fixedly connected through a stem, and each rotary drum 23 is rotatably connected to the stem; a positioning assembly is provided between each drum 23 and the stem to limit the resting position of drum 23 after rotation on the stem.

The positioning component is a steel ball arranged on the inner wall of the rotary drum 23 and a notch corresponding to the steel ball arranged on the core column, and the steel ball is abutted by a pressure spring.

Because the drums 23 are rotating members, the electrical connection between adjacent drum 23 assemblies is conventional brush structures, which are conventional in the art and will not be described in detail herein.

The key with the structure can be used for unlocking a plurality of locks by one key by rotating the rotary cylinder 23 to change the position of the wiring contact 24 matched with the true contact 12, and can be used for a centralized group such as families, hotel managers and the like.

As shown in fig. 5, 6 and 7, the locking mechanism further comprises an active lock structure arranged on the door body and a passive lock structure arranged on the door frame, the active lock structure comprises a first limiting frame 32, an active gear 33, an active lock tongue 34 and an active rotating shaft 35, the first limiting frame 32 is fixed in the door body, the active gear 33 and the active lock tongue 34 are both fixed on the active rotating shaft 35, two active lock tongues 34 are arranged, the active gear 33 is positioned between the two active lock tongues 34, the active rotating shaft 35 is of a hollow structure, and the plug cylinder 11 is rotatably connected in the active rotating shaft 35;

the passive lock structure comprises a second limit frame 41, a passive gear 42, a passive lock tongue 43 and a passive rotating shaft 44, wherein the second limit frame 41 is fixed in a door frame, the passive lock tongue 43 is fixed on the passive rotating shaft 44, two passive lock tongues 43 are arranged, the passive gear 42 is positioned between the two passive lock tongues 43, a transmission gear ring 45 is arranged on the passive rotating shaft 44, an annular gear 46 is arranged in the passive gear 42, a freely rotating planetary gear 47 is connected between the two passive lock tongues 43, and each planetary gear 47 simultaneously engages the transmission gear ring 45 and the annular gear 46; the driven gear 42 can be meshed with the driving gear 33, and the driving lock tongue 34 and the driven lock tongue 43 are wedge-shaped; when the driving lock tongue 34 is inserted into the second limit frame 41 and the driven lock tongue 43 is inserted into the first limit frame 32, the driving lock tongue 34 and the driven lock tongue 43 are symmetrically distributed; the driving spring bolt 34 is connected with the first limiting frame 32 through a plane bearing, and the driven spring bolt 43 is connected with the second limiting frame 41 through a plane bearing.

The lock with the structure can be in a locking state, the driving lock tongue 34 is inserted into the second limiting frame 41 on the door frame, the driven lock tongue 43 is inserted into the first limiting frame 32 on the door body, the door body or the door frame is damaged independently, the door body or the door frame cannot be opened, and the anti-theft effect and the lock prying difficulty are greatly improved.

By the action of the driven gear 42, the planetary gear 47, the transmission gear ring 45 and the inner gear ring 46, when the driving gear 33 and the driven gear 42 are meshed for transmission, the rotation directions of the driving rotating shaft 35 and the driven rotating shaft 44 are the same, so that when the lock is opened, the driving lock tongue 34 swings downwards, the driven lock tongue 43 swings upwards, and the driving lock tongue 34 and the driven lock tongue 43 cannot interfere with each other. This structure can also effectually avoid opening the possibility of lock through modes such as card, and the card can't act on the inclined plane of initiative spring bolt 34 and passive spring bolt 43, and the pressure of acting on initiative spring bolt 34 and passive spring bolt 43 can't shake the position of initiative spring bolt and passive spring bolt 43.

Further, the two sides of the teeth on the driving gear 33 have a first guiding inclined plane, and the two sides of the teeth on the driven gear 42 have a second guiding inclined plane.

The side surface of the tooth means a side surface corresponding to the tread of the driving gear 33 or the driven gear 42, and the driving gear 33 and the driven gear 42 are smoothly engaged when the door body and the door frame approach each other.

The inner end of the driving rotating shaft 35 is in threaded connection with a sliding block 56, the sliding block 56 is provided with an iron magnetic flux ring 51, the inner end of the driving rotating shaft 35 is fixedly provided with an armature block 52, and the magnetic coil 31 is wound on the armature block 52; a return spring 53 is connected between the slider 56 and the inner wall of the driving shaft 35. After the magnetic coil 31 is electrified, the armature block 52 adsorbs the magnetic ring 51, so that the sliding block 56 moves and drives the driving rotating shaft 35 to rotate, and the lock is unlocked. Through the structural design and the cooperation of the travel of the sliding block 56 and the threaded structure, when the sliding block 56 is at two limit positions, the driving bolt 34 is respectively located in a locking state and a separating state.

The sliding block 56 is rotatably connected with a handle 54, the handle 54 extends out of the inner side surface of the door body, a pull ring 55 is fixedly arranged on the inner side surface of the door body, and the handle 54 is positioned on the inner side of the pull ring 55. When the door is not closed, the pull handle 54 is pulled, the pull ring 55 is pressed, the sliding block 56 is moved, the driving lock tongue 34 and the driven lock tongue 43 are driven to be unseated, and the driving lock tongue 34 is unseated first, and then the door body is folded towards the door frame.

A reset torsion spring is connected between the driven rotating shaft 44 and the second limiting frame 41, and the reset torsion spring drives the driven lock tongue 43 to be located at a position away from the first limiting frame 32 under the action of external force not applied to the driven gear 42. Through structural parameter's design, make the passive spring bolt 43 under reset torsional spring independent action be located limit frame two 41 top, owing to the existence of planetary transmission structure between passive gear 42 and the passive pivot 44, even the driving gear 33 is the same with passive gear 42 specification, the corner of driving spring bolt 34 and passive spring bolt 43 can not keep unanimous yet, need cooperate through the position of driving spring bolt 34 after unblanking, namely under driving spring bolt 34 two extreme positions, the rotation of driving gear 33 just makes passive spring bolt 43 be located the locking state and break away from limit frame one 32's restriction state respectively, the description of this section is just in order to explain the feasibility of this scheme, and make this scheme cover other parameter designs or equivalent structural design's that have above-mentioned function scheme.

Embodiment two:

as shown in fig. 4, the content of this embodiment is substantially the same as that of the first embodiment, except that: the lead-in portion 25 and the handle portion 26 are fixedly connected by a stem, and each drum 23 is fixedly connected to the stem. The key with the structure can only unlock one lock, and belongs to a special key.

It should be noted that: for clarity of fig. 1, only one set of dummy contacts is shown in contact with the magnetically permeable coil, and in practice, the other sets of dummy contacts are in contact with the magnetically permeable coil.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The anti-theft device is characterized by comprising an electronic key and an anti-theft lock matched with the electronic key, wherein the anti-theft lock comprises a lock cylinder, the electronic key comprises a cylindrical plug (2) and a locking mechanism arranged in the plug (2), the locking mechanism comprises a magnetic coil (31), the lock cylinder comprises a plug cylinder (11), the plug (2) can be inserted into the plug cylinder (11), a power supply (21) and an indicator lamp (22) connected in series with the power supply (21) are arranged in the plug (2), a plurality of rotary cylinders (23) are arranged on the plug (2), two wiring contacts (24) are arranged on the outer peripheral surface of each rotary cylinder (23), annular control areas corresponding to the rotary cylinders (23) one by one are arranged on the inner wall of the plug cylinder (11), a group of true contacts (12) and a plurality of false contacts (13) are arranged on each control area, the true contacts (12) comprise two conducting contacts (121), and the two conducting contacts (121) are electrically connected; -each set of said dummy contacts (13) comprises two shorting contacts (131); all the conducting contacts (121) and all the short-circuit contacts (131) on the same control area are uniformly distributed in the circumferential direction; when the key is matched with the lock core, the two wiring contacts (24) on each rotary drum (23) are communicated with the two conduction contacts (121) on the corresponding control area, and a complete electric reflux is formed by the power supply (21), the indicator lamp (22) and the magnetic coil (31); two short-circuit contacts (131) on each group of false contacts (13) are respectively connected with two ends of the magnetic coil (31); when any false contact (13) corresponds to the wiring contact (24), the magnetic coil (31) is in a short circuit or open state;

the plug (2) comprises an introduction part (25) and a handle part (26), and each rotary drum (23) is positioned between the introduction part (25) and the handle part (26);

the guide-in part (25) and the rotary drum (23) are of external spline structures, and the inner wall of the plug tube (11) is of an internal spline structure corresponding to the plug (2);

the guide-in part (25) is provided with a positioning convex rib (27), and the inner wall of the insertion cylinder (11) is provided with a positioning groove matched with the positioning convex rib (27);

the leading-in part (25) and the handle part (26) are fixedly connected through a stem, and each rotary drum (23) is rotationally connected to the stem; a positioning assembly for limiting the stay position of the rotary drum (23) after rotating on the core column is arranged between each rotary drum (23) and the core column;

the locking mechanism further comprises an active lock structure arranged on the door body and a passive lock structure arranged on the door frame, the active lock structure comprises a first limiting frame (32), an active gear (33), an active lock tongue (34) and an active rotating shaft (35), the first limiting frame (32) is fixed in the door body, the active gear (33) and the active lock tongue (34) are both fixed on the active rotating shaft (35), the number of the active lock tongues (34) is two, the active gear (33) is arranged between the two active lock tongues (34), the active rotating shaft (35) is of a hollow structure, and the inserting cylinder (11) is rotationally connected in the active rotating shaft (35);

the passive lock structure comprises a limiting frame II (41), passive gears (42), passive lock bolts (43) and a passive rotating shaft (44), wherein the limiting frame II (41) is fixed in a door frame, the passive lock bolts (43) are fixed on the passive rotating shaft (44), the number of the passive lock bolts (43) is two, the passive gears (42) are positioned between the two passive lock bolts (43), a transmission gear ring (45) is arranged on the passive rotating shaft (44), an inner gear ring (46) is arranged in the passive gears (42), planetary gears (47) capable of freely rotating are connected between the two passive lock bolts (43), and each planetary gear (47) is meshed with the transmission gear ring (45) and the inner gear ring (46) simultaneously; the driven gear (42) can be meshed with the driving gear (33), and the driving lock tongue (34) and the driven lock tongue (43) are wedge-shaped; when the driving lock tongue (34) is inserted into the second limit frame (41) and the driven lock tongue (43) is inserted into the first limit frame (32), the driving lock tongue (34) and the driven lock tongue (43) are symmetrically distributed; the driving lock tongue (34) is connected with the first limiting frame (32) through a plane bearing, and the driven lock tongue (43) is connected with the second limiting frame (41) through a plane bearing;

the inner end of the driving rotating shaft (35) is in threaded connection with a sliding block (56), an iron magnetic ring (51) is arranged on the sliding block (56), an armature block (52) is fixedly arranged at the inner end of the driving rotating shaft (35), and the magnetic coil (31) is wound on the armature block (52); a reset spring (53) is connected between the sliding block (56) and the inner wall of the driving rotating shaft (35);

a reset torsion spring is connected between the driven rotating shaft (44) and the second limiting frame (41), and the reset torsion spring drives the driven lock tongue (43) to be positioned at a position far away from the first limiting frame (32) under the action of external force of the driven gear (42);

after the magnetic coil (31) is electrified, the armature block (52) adsorbs the magnetic ring (51) to enable the sliding block (56) to move and drive the driving rotating shaft (35) to rotate, so that the lock is unlocked.

2. The anti-theft device according to claim 1, characterized in that a handle (54) is rotatably connected to the slider (56), the handle (54) extends out of the inner side of the door, a pull ring (55) is fixedly arranged on the inner side of the door, and the handle (54) is located inside the pull ring (55).