CN211062155U

CN211062155U - Burglar alarm capable of automatically winding up wire

Info

Publication number: CN211062155U
Application number: CN202020086929.1U
Authority: CN
Inventors: 葛昭盼; 唐志明; 徐苗丰; 冯正虎
Original assignee: Hangzhou Ontime IT Co ltd
Current assignee: Hangzhou Ontime IT Co ltd
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-07-21
Anticipated expiration: 2030-01-15

Abstract

The utility model relates to a box class commodity theftproof field. The anti-theft device has the function of automatically winding, can greatly save manual winding time, can stop winding at any time in the automatic winding process, and is compact in structure, convenient to operate and reliable in work. The technical scheme is as follows: an anti-theft device capable of automatically winding comprises a rotating part, a positioning part and a steel wire rope connected between the rotating part and the positioning part; the method is characterized in that: the rotating part includes the casing, carries out the wire winding subassembly of rolling and unreeling to wire rope, is used for guaranteeing that wire winding subassembly can only unidirectional rotation with the locking Assembly of rolling wire rope, with the wire rope automatic winding to the circuit subassembly of receiving the line subassembly on the wire winding subassembly and being used for reporting to the police.

Description

Burglar alarm capable of automatically winding up wire

Technical Field

The utility model relates to a box class commodity theftproof field specifically is a can receive alarm of line automatically.

Background

In places for selling goods, such as supermarkets and household appliance stores, large articles sold or displayed by the places or three-dimensional commodities in the shapes of cubes and the like, such as cases, cans, food boxes, packing cases containing sold goods, packing boxes, books and the like, are provided with burglar alarms for preventing theft. Chinese patent (publication No. 2896391Y) discloses a "commodity antitheft device", which is provided with a binding rope, a housing, and an electronic article surveillance marker, wherein the housing is provided with a tightening structure for tightening the binding rope and a locking structure for tightening the binding rope, and the housing is also provided with an alarm circuit, and the binding rope passes through a shell of the electronic article surveillance marker and then is connected with the alarm circuit; when the anti-theft device is used, a commodity is placed between the shell and the electronic article monitoring marker, the operating piece in the tightening structure is rotated to tighten the binding rope, the locking structure is used for preventing the binding rope from being loosened, and when the binding rope is broken, the alarm circuit is triggered, so that the anti-theft effect is achieved. The anti-theft device with the structure needs to manually rotate the operating piece when the bundling rope is tightened, is time-consuming and labor-consuming, and needs to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of above-mentioned background art, provide a can receive alarm of line automatically, this alarm has the automatic line function of receiving, can save the artifical time of receiving the line greatly to receive the line in-process and can stop at any time and receive the line automatically, compact structure, convenient operation, reliable operation.

The utility model provides a technical scheme is:

an anti-theft device capable of automatically winding comprises a rotating part, a positioning part and a steel wire rope connected between the rotating part and the positioning part; the method is characterized in that: the rotating part includes the casing, carries out the wire winding subassembly of rolling and unreeling to wire rope, is used for guaranteeing that wire winding subassembly can only unidirectional rotation with the locking Assembly of rolling wire rope, with the wire rope automatic winding to the circuit subassembly of receiving the line subassembly on the wire winding subassembly and being used for reporting to the police.

The shell comprises a vertical tooth cover, a shell and a lower cover which are coaxially arranged and fixedly connected in sequence from top to bottom; and a circle of upper sawteeth are arranged on the inner wall of the vertical tooth cover in the circumferential direction.

The winding assembly comprises a rotary cover, a carrying pole and a winding disc, wherein the rotary cover is installed in the vertical tooth cover, the upper part of the rotary cover protrudes out of the vertical tooth cover, the carrying pole is embedded in a clamping groove at the bottom of the rotary cover, and the winding disc is installed in the shell and is connected with the carrying pole in an inserting mode; a protective sleeve for mounting a locking assembly is arranged on the upper part of the rotary cover; the two ends of the shoulder pole are provided with lower saw teeth which are unidirectionally meshed with the upper saw teeth on the inner wall of the vertical tooth cover so as to unidirectionally lock the wire spool; the top of the shoulder pole is provided with a bulge which is connected with the locking component in an abutting mode; two connecting columns are arranged at the bottom of the shoulder pole; the surface of the wire spool is provided with two connecting holes which are in plug-in connection with the two connecting columns; and a shoulder pole spring sleeved outside the connecting column is arranged in the connecting hole.

The locking assembly comprises a plug pin which is horizontally arranged, the bottom of the plug pin is connected with the protrusion of the carrying pole in an abutting mode, a plug pin cap which is fixed at one end of the plug pin and is convenient for pressing the plug pin, a plug pin spring which is sleeved on the plug pin and is pressed on the inner side of the plug pin cap in an abutting mode, a lock cylinder which is vertically arranged and is matched with the other end of the plug pin in an inserting mode, a lock cylinder cap which is fixed at the upper portion of the lock cylinder and a lock cylinder; the bottom of the bolt is provided with an inclined plane matched with the bulge; the bolt spring is in clamping fit with the limiting clamping protrusion on the inner wall of the protective sleeve so as to prevent the bolt spring from popping out of the protective sleeve; the lock cylinder cap outer wall is provided with a limiting convex ring in clamping fit with the limiting groove of the protective sleeve inner wall so as to prevent the lock cylinder spring from popping out of the protective sleeve.

The wire take-up assembly comprises a coil spring fixing piece, a coil spring, an emergency stop sheet and a latch piece, wherein the coil spring fixing piece, the coil spring and the emergency stop sheet are arranged in the shell in sequence from top to bottom, and the latch piece is arranged between the shell and the lower cover and can rotate around a pin fixed on the shell; the coil spring fixing piece is fixed at the bottom of the wire spool through a screw; a downward-extending protrusion is arranged at the center of the bottom of the coil spring fixing piece; the inner end part of the coil spring is fixedly connected with the protrusion, and the outer end part of the coil spring is fixedly connected with the shell; the middle part of the emergency stop sheet is sleeved on the protrusion in a penetrating manner, so that the coil spring fixing piece, the coil spring and the emergency stop sheet synchronously rotate along with the wire spool; a plurality of barbs are uniformly arranged on the outer edge of the quick stopping sheet; one end of the clamping tooth piece extends out of the shell, and the other end of the clamping tooth piece can be clamped and matched with the barb on the emergency stop sheet to brake the emergency stop sheet; the pin is sleeved with a torsional spring, one end of the torsional spring is fixedly connected with the latch piece, and the other end of the torsional spring is fixedly connected with the shell.

The circuit component comprises a circuit board embedded in the middle of the wire spool and a power supply part which is fixed at the bottom of the emergency stop sheet and is connected with the circuit board through an electric wire so as to provide working power supply.

The power supply part comprises a battery fixing part arranged below the emergency stop sheet, a battery cover arranged below the battery fixing part, a battery embedded between the battery fixing part and the battery cover, and a positive battery clamping seat and a negative battery clamping seat, wherein one end of the positive battery clamping seat is connected with the battery, and the other end of the positive battery clamping seat is connected with an electric wire after upwards penetrating through the battery fixing part; the battery cover, the battery fixing piece and the emergency stop sheet are connected into a whole through screws.

The positioning part comprises a box cover for placing commodities and a box bottom fixed below the box cover; two wire grooves penetrating through the side face of the box bottom are symmetrically formed in the box bottom.

Four through holes for the steel wire rope to pass through are uniformly formed in the side face of the shell; one end of the steel wire rope is fixed on the wire spool and connected into the circuit board, and the other end of the steel wire rope penetrates through two adjacent through holes, two wire grooves and the remaining two through holes respectively and then is fixed on the wire spool and connected into the circuit board.

The utility model has the advantages that:

1) the utility model discloses the last sawtooth of accessible vertical tooth lid inner wall plays the theftproof effect with the lower sawtooth one-way meshing at shoulder pole both ends. When the upper saw teeth are meshed with the lower saw teeth in a one-way mode, the wire spool can only rotate forwards but not reversely, the fact that the steel wire rope can only be wound on the wire spool and cannot be unwound is guaranteed, and therefore goods are locked; when the upper saw teeth and the lower saw teeth are separated, the wire spool can rotate forwards or backwards, and the commodity can be loosened by lengthening the steel wire rope, so that the operation is convenient.

2) The utility model discloses a bolt bottom is provided with the inclined plane of being connected with the arch of shoulder pole top is supported, and the meshing of sawtooth and lower sawtooth is adjusted and is thrown off in the cooperation of accessible bolt and lock core. When the bolt is in inserted fit with the lock core, the protrusion is contacted with the uppermost end of the inclined plane, and the upper saw teeth are meshed with the lower saw teeth in a one-way mode; when the bolt is separated from the lock core, the bolt presses the protrusion downwards, the protrusion is contacted with the lowest end of the inclined plane, the upper saw teeth and the lower saw teeth are forced to be separated, the work is reliable, and the stability is good.

3) The utility model discloses in, the interior tip of coil spring and the outstanding fixed connection of coil spring mounting bottom, the outer tip and the shell fixed connection of coil spring can realize wire rope's automation through the coil spring and receive the line. When the steel wire rope is elongated to unreel, the wire spool is driven to rotate reversely to tighten the coil spring; when the steel wire rope is loosened, the wire spool is driven to rotate in the forward direction under the action of restoring force of the coil spring, the steel wire rope is wound automatically, and manual wire winding time is greatly saved.

4) The utility model provides a latch spare can with the barb joint of scram piece outer fringe to braking scram piece, because scram piece and wire reel rotate in step, wire reel stall simultaneously guarantees that wire rope can stop at any time receiving the line at the automatic line in-process of receiving, with the extension length according to the size adjustment steel wire of commodity, the placing of the commodity of being convenient for, convenient operation.

5) The clamping tooth piece and the shell are connected with the torsion spring, when the clamping tooth piece is separated from the barb of the emergency stop sheet, the clamping tooth piece can automatically reset under the torsion action of the torsion spring, and the device is more humanized and suitable for popularization and application.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic top view of the present invention.

Fig. 3 is a schematic cross-sectional view of Y-Y in fig. 2.

Fig. 4 is an enlarged view of a portion F in fig. 3.

Fig. 5 is a schematic diagram of the explosion structure of the present invention.

Fig. 6 is a schematic view of the cross-sectional structure of the vertical tooth cover of the present invention.

Fig. 7 is a schematic sectional view of the rotary cover of the present invention.

Fig. 8 is a schematic perspective view of the shoulder pole of the present invention.

Fig. 9 is a schematic view of the three-dimensional structure of the plug pin of the present invention.

Fig. 10 is a schematic top view of the snap-action plate of the present invention.

Fig. 11 is a schematic top view of the bottom of the box of the present invention.

Fig. 12 is a schematic view of the usage state of the present invention.

Reference numerals:

A. a rotating part; B. a positioning part; C. a wire rope; 11. a vertical tooth cover; 111. upper saw teeth; 12. a housing; 121. perforating; 13. a lower cover; 21. a rotating cover; 22. carrying a shoulder pole; 23. a wire spool; 212. limiting clamping protrusions; 213. a limiting groove; 221. a lower sawtooth; 222. a protrusion; 223. connecting columns; 231. connecting holes; 24. a shoulder pole spring; 31. a bolt; 311. a bevel; 312. a lock hole; 32. a latch cap; 33. a latch spring; 34. a lock cylinder; 35. a lock cylinder cap; 351. a limit convex ring; 36. a lock cylinder spring; 41. a coil spring retainer; 411. a protrusion; 42. a coil spring; 43. a sudden stop sheet; 431. a barb; 44. a latch member; 45. a pin; 46. a torsion spring; 51. a circuit board; 52. an electric wire; 531. a battery holder; 532. a battery cover; 533. positive and negative battery holders; 534. a battery; 61. a box cover; 62. a box bottom; 621. a wire slot.

Detailed Description

The following further description is made with reference to the embodiments shown in the drawings.

The burglar alarm capable of automatically winding comprises a rotating part A, a positioning part B and a steel wire rope C connected between the rotating part and the positioning part. The rotating part includes casing, wire winding subassembly, locking Assembly, receipts line subassembly and circuit subassembly.

The housing includes a vertical tooth cover 11, a housing 12, and a lower cover 13. The vertical tooth cover, the shell and the lower cover are coaxially arranged and are sequentially and fixedly connected from top to bottom. And a circle of upper sawteeth 111 are arranged on the inner wall of the vertical tooth cover in the circumferential direction. Four through holes 121 for the steel wire rope to pass through are uniformly formed in the side face of the shell.

The wire winding assembly is used for winding and unwinding the steel wire rope and comprises a rotary cover 21, a carrying pole 22 and a wire spool 23. The rotary cover is arranged in the vertical tooth cover, and the upper part of the rotary cover protrudes out of the vertical tooth cover; a protective sleeve for installing a locking assembly is arranged on the upper part of the rotary cover; the bottom of the rotary cover is provided with a clamping groove (not shown in the figure). The shoulder pole is embedded in the clamping groove; the two ends of the shoulder pole are provided with lower saw teeth 221 which can be meshed with the upper saw teeth in a one-way manner; the top of the shoulder pole is provided with a bulge 222 which is connected with the locking component in an abutting mode; the bottom of the shoulder pole is provided with two connecting posts 223. The surface of the wire spool is provided with two connecting holes 231 which are respectively in plug connection with the two connecting columns, so that the rotating cover, the carrying pole and the wire spool synchronously rotate; and a shoulder pole spring 24 sleeved outside the connecting column is arranged in the connecting hole. In this embodiment, wire rope rolling when wire reel corotation, wire rope unreels when wire reel reversal. When the upper saw teeth are meshed with the lower saw teeth in a one-way mode, the wire spool can only rotate forwards but not reversely, the fact that the steel wire rope can only be wound on the wire spool but cannot be unwound is guaranteed, and therefore goods are locked; when the upper saw teeth and the lower saw teeth are disengaged, the wire spool can rotate forwards or backwards, and the commodity can be loosened by lengthening the steel wire rope.

The locking assembly is used for controlling the engagement and disengagement of the upper saw teeth and the lower saw teeth, so that the winding assembly can only rotate in one direction to wind the steel wire rope; the locking assembly includes a latch 31, a latch cap 32, a latch spring 33, a plug 34, a plug cap 35, and a plug spring 36. The bolts are horizontally arranged; the bottom of the bolt is provided with an inclined plane 311 which is connected with the bulge of the shoulder pole in an abutting mode. The bolt cap is fixed at one end of the bolt through a screw, the bolt cap serves as a stress component of the bolt, and the bolt can be pushed to move horizontally by pressing the bolt cap. The bolt spring is sleeved on the bolt and is pressed against the inner side of the bolt cap (namely, one side in the protective sleeve); the bolt spring is in clamping fit with the limiting clamping protrusion 212 on the inner wall of the protective sleeve to prevent the bolt spring from popping out of the protective sleeve. The lock cylinder is vertically arranged, and the lock cylinder is in inserted fit with the other end of the bolt (the bolt is provided with a lock hole 312 in inserted fit with the lock cylinder); the lock cylinder cap is fixed on the upper part of the lock cylinder; the lock cylinder spring is arranged between the lock cylinder and the lock cylinder cap. The outer wall of the lock cylinder cap is provided with a limiting convex ring 351, and the limiting convex ring is in clamping fit with a limiting groove 213 of the inner wall of the protective sleeve to prevent the lock cylinder spring from popping out of the protective sleeve. When the bolt is in inserted fit with the lock core, the protrusion is contacted with the uppermost end of the inclined plane, and the lower sawteeth and the upper sawteeth are meshed in a single direction; when the bolt is separated from the lock core (which needs to be realized by a special lock opener), the bulge is contacted with the lowest end of the inclined plane, and the bolt downwards presses the bulge to force the lower sawteeth to be separated from the upper sawteeth.

The wire take-up assembly is used for automatically taking up the steel wire rope on the wire winding assembly and comprises a coil spring fixing piece 41, a coil spring 42, an emergency stop piece 43, a pin 45, a torsion spring 46 and a latch piece 44. The coil spring fixing piece, the coil spring and the emergency stop sheet are installed in the shell and are sequentially arranged from top to bottom. The coil spring fixing piece is fixed at the bottom of the wire spool through a screw; the center of the bottom of the coil spring retainer is provided with a downwardly projecting tab 411. The inner end part of the coil spring is fixedly connected with the protrusion, and the outer end part of the coil spring is fixedly connected with the shell; in this embodiment, when the wire rope is elongated, i.e. the wire spool is reversely rotated, the coil spring is tightened to generate torque. The middle part of the emergency stop sheet is sleeved on the protrusion in a penetrating manner, so that the coil spring fixing piece, the coil spring and the emergency stop sheet synchronously rotate along with the wire spool; the outer edge of the quick stopping sheet is uniformly provided with a plurality of barbs 431. The pin is vertically fixed inside the shell. The torsion spring is sleeved on the pin, and one end of the torsion spring is fixedly connected with the latch piece and the other end of the torsion spring is fixedly connected with the shell. One end of the clamping tooth piece extends out of the shell, and the other end of the clamping tooth piece can be matched with the barb on the emergency stop sheet in a clamping mode so as to brake the emergency stop sheet. In the automatic wire winding process of the steel wire rope, the clamping tooth piece is pressed down and can be clamped with the barb at the outer edge of the emergency stop sheet, so that the emergency stop sheet is braked, the wire spool stops rotating at the same time, and the wire winding can be stopped at any time in the automatic wire winding process of the steel wire rope; after the latch member is loosened, the latch member automatically resets under the torsion action of the torsion spring, and the operation is convenient.

The circuit assembly is used for alarming and comprises a circuit board 51 and a power supply part. The circuit board inlays the dress in the middle part of wire reel (wire reel middle part sets up the standing groove of circuit board, and the shoulder pole is located the circuit board top). The power supply part is fixed at the bottom of the emergency stop sheet and is connected with the circuit board through an electric wire 52 to provide a working power supply for the circuit board. The power supply unit includes a battery holder 531, a battery cover 532, a battery 534, and positive and negative battery holders 533. The battery fixing piece is positioned below the sudden stop piece; the battery cover is positioned below the battery fixing piece; the battery cover, the battery fixing piece and the emergency stop sheet are connected into a whole through screws. The battery is embedded between the battery fixing piece and the battery cover. One end of the positive battery clamping seat and one end of the negative battery clamping seat are connected with the battery, and the other end of the positive battery clamping seat and the other end of the negative battery clamping seat penetrate through the battery fixing piece upwards and are connected with the circuit board through wires.

The positioning part includes a box cover 61 for placing goods and a box bottom 62 fixed below the box cover. And two wire grooves 621 penetrating through the side face of the box bottom are symmetrically arranged in the box bottom. One end of the steel wire rope is fixed on the wire spool and connected with the circuit board, and the other end of the steel wire rope penetrates through two adjacent through holes, two wire grooves and the remaining two through holes respectively and then is fixed on the wire spool and connected with the circuit board, so that the steel wire rope and the circuit board form a closed loop, and when the steel wire rope is broken, an alarm circuit (in the prior art) on the circuit board is triggered to alarm.

The shell, the winding assembly, the locking assembly, the circuit assembly, the positioning portion and the steel wire rope in the rotating portion are all in the prior art. The utility model discloses an improvement part has set up foretell receipts line subassembly to on with wire rope automatic winding to wire winding subassembly, avoid manual rotation rotatory lid to receive the line, save time greatly.

The utility model discloses a working method as follows:

when the positioning device is used, a commodity S is placed between the rotating part and the positioning part, and the steel wire rope is positioned around the commodity. When the unlocking device is used for unlocking, the lock cylinder rises to be separated from the bolt, the bolt is outwards popped out under the elastic force action of the bolt spring, the bolt presses the shoulder pole, the protrusion of the shoulder pole descends to the lowest end of the inclined plane along the inclined plane at the bottom of the bolt, the upper saw teeth of the vertical tooth cover are forced to be disengaged from the lower saw teeth of the shoulder pole, at the moment, the shoulder pole is still positioned in the clamping groove at the bottom of the rotating cover, the shoulder pole and the wire winding disc are still synchronously rotated, and the commodity can be taken down by elongating the steel wire rope.

In the process of lengthening the steel wire rope, the coil spring is tightened, and further potential energy is increased; after the commodity is taken down and the steel wire rope is loosened, the wire spool is driven to rotate in the forward direction and the steel wire rope is wound under the action of the restoring force of the coil spring, and automatic wire winding is achieved. In the automatic wire rewinding process, the clamping tooth piece is pressed down to be clamped with the barb on the outer edge of the emergency stop piece, and the wire rewinding can be stopped at any time, so that a merchant can adjust the steel wire rope to a proper extension length according to the size of a commodity, and the commodity is convenient to place. After the commodity is placed, the steel wire rope is slightly lengthened or the rotating cover is rotated reversely by a small angle, so that the clamping tooth part is separated from the barb of the emergency stop sheet, the steel wire rope automatically receives the wire again to lock the commodity, and meanwhile, the clamping tooth part automatically resets under the torsion action of the torsion spring.

When the steel wire rope is tightened or the commodity is in a locked state (see fig. 12), the bolt cap is pressed to push the bolt to move horizontally, the bolt is matched with the lock cylinder in an inserted mode, under the elastic force action of the shoulder pole spring, the protrusion of the shoulder pole rises to the uppermost end of the inclined plane along the inclined plane at the bottom of the bolt, the upper saw teeth of the vertical tooth cover are meshed with the lower saw teeth of the shoulder pole in a one-way mode, the wire spool cannot rotate reversely, the steel wire rope is prevented from being unreeled and stretched, and therefore the burglar alarm is tightly bound on the surface of. Under the state, unless a magnet on the special unlocking device is adopted to suck the lock cylinder out of the bolt for unlocking, the burglar alarm can be removed only by cutting off the steel wire rope, and the alarm circuit is triggered to alarm when the steel wire rope is broken, so that the dual-theft-prevention effect is achieved.

Finally, it should be noted that the above-mentioned embodiments illustrate only specific embodiments of the invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.

Claims

1. An anti-theft device capable of automatically winding wires comprises a rotating part (A), a positioning part (B) and a steel wire rope (C) connected between the rotating part and the positioning part; the method is characterized in that: the rotating part includes the casing, carries out the wire winding subassembly of rolling and unreeling to wire rope, is used for guaranteeing that wire winding subassembly can only unidirectional rotation with the locking Assembly of rolling wire rope, with the wire rope automatic winding to the circuit subassembly of receiving the line subassembly on the wire winding subassembly and being used for reporting to the police.

2. The burglar alarm capable of automatically winding according to claim 1, wherein: the shell comprises a vertical tooth cover (11), a shell (12) and a lower cover (13) which are coaxially arranged and fixedly connected in sequence from top to bottom; and a circle of upper sawteeth (111) are arranged on the inner wall of the vertical tooth cover in the circumferential direction.

3. The burglar alarm capable of automatically winding according to claim 2, wherein: the wire winding assembly comprises a rotary cover (21) which is arranged in the vertical tooth cover and the upper part of the rotary cover protrudes out of the vertical tooth cover, a carrying pole (22) which is embedded in a clamping groove at the bottom of the rotary cover and a wire winding disc (23) which is arranged in the shell and is connected with the carrying pole in an inserting manner; a protective sleeve for mounting a locking assembly is arranged on the upper part of the rotary cover; the two ends of the shoulder pole are provided with lower saw teeth (221) which are unidirectionally meshed with the upper saw teeth on the inner wall of the vertical tooth cover to unidirectionally lock the wire spool; the top of the shoulder pole is provided with a bulge (222) which is connected with the locking component in an abutting mode; two connecting columns (223) are arranged at the bottom of the shoulder pole; the surface of the wire spool is provided with two connecting holes (231) which are in plug-in connection with the two connecting columns; and a shoulder pole spring (24) sleeved outside the connecting column is arranged in the connecting hole.

4. The burglar alarm capable of automatically winding according to claim 3, wherein: the locking assembly comprises a plug pin (31) which is horizontally arranged, the bottom of the plug pin is in abutting connection with the protrusion of the carrying pole, a plug pin cap (32) which is fixed at one end of the plug pin to press the plug pin conveniently, a plug pin spring (33) which is sleeved on the plug pin and is pressed on the inner side of the plug pin cap, a lock cylinder (34) which is vertically arranged and is in inserting fit with the other end of the plug pin, a lock cylinder cap (35) which is fixed at the upper part of the lock cylinder and a lock cylinder spring (36) which is arranged between; the bottom of the bolt is provided with an inclined plane (311) matched with the bulge; the bolt spring is in clamping fit with a limiting clamping protrusion (212) on the inner wall of the protective sleeve so as to prevent the bolt spring from popping out of the protective sleeve; the lock cylinder cap outer wall is equipped with the spacing protruding ring (351) of protective sheath inner wall's spacing groove (213) joint complex to prevent that the lock cylinder spring from popping out the protective sheath.

5. The burglar alarm capable of automatically winding according to claim 4, wherein: the wire take-up assembly comprises a coil spring fixing piece (41), a coil spring (42), an emergency stop piece (43) and a latch piece (44), wherein the coil spring fixing piece, the coil spring (42) and the emergency stop piece (43) are arranged in the shell and are sequentially arranged from top to bottom, and the latch piece (44) is arranged between the shell and the lower cover and can rotate around a pin (45) fixed on the shell; the coil spring fixing piece is fixed at the bottom of the wire spool through a screw; a protrusion (411) protruding downwards is arranged at the center of the bottom of the coil spring fixing piece; the inner end part of the coil spring is fixedly connected with the protrusion, and the outer end part of the coil spring is fixedly connected with the shell; the middle part of the emergency stop sheet is sleeved on the protrusion in a penetrating manner, so that the coil spring fixing piece, the coil spring and the emergency stop sheet synchronously rotate along with the wire spool; a plurality of barbs (431) are uniformly arranged on the outer edge of the quick stopping sheet; one end of the clamping tooth piece extends out of the shell, and the other end of the clamping tooth piece can be clamped and matched with the barb on the emergency stop sheet to brake the emergency stop sheet; the pin is sleeved with a torsional spring (46) with one end fixedly connected with the latch part and the other end fixedly connected with the shell.

6. The burglar alarm capable of automatically winding according to claim 5, wherein: the circuit assembly comprises a circuit board (51) embedded in the middle of the wire spool and a power supply part which is fixed at the bottom of the emergency stop sheet and is connected with the circuit board through an electric wire (52) to provide working power supply.

7. The burglar alarm capable of automatically winding according to claim 6, wherein: the power supply part comprises a battery fixing part (531) arranged below the emergency stop sheet, a battery cover (532) arranged below the battery fixing part, a battery (534) embedded between the battery fixing part and the battery cover, and a positive battery clamping seat and a negative battery clamping seat (533) of which one ends are connected with the battery and the other ends upwards penetrate through the battery fixing part and then are connected with the electric wire; the battery cover, the battery fixing piece and the emergency stop sheet are connected into a whole through screws.

8. The burglar alarm capable of automatically winding according to claim 7, wherein: the positioning part comprises a box cover (61) for placing commodities and a box bottom (62) fixed below the box cover; two wire grooves (621) penetrating through the side face of the box bottom are symmetrically formed in the box bottom.

9. The burglar alarm capable of automatically winding according to claim 8, wherein: four through holes (121) for the steel wire rope to pass through are uniformly formed in the side face of the shell; one end of the steel wire rope is fixed on the wire spool and connected into the circuit board, and the other end of the steel wire rope penetrates through two adjacent through holes, two wire grooves and the remaining two through holes respectively and then is fixed on the wire spool and connected into the circuit board.