Mechanical anti-theft device

Abstract

The invention discloses a mechanical anti-theft device which comprises a bottom plate, a first lock plate and a second lock plate are fixedly mounted at the top of the bottom plate, a second groove is formed in one side of the first lock plate, a third groove is formed in the inner surface of the second groove, a lock rod is slidably mounted on the inner surface of the third groove, and a fixing disc is fixedly mounted at one end of the lock rod. A seventh groove is formed in one side of the second locking plate, and a second limiting plate is slidably mounted on the inner surface of the seventh groove. A second through hole of a second limiting plate is pushed through a pressing block to wrap the outer surface of a lock rod, sliding of the pressing block and the second limiting plate is limited by inserting a limiting rod into an inner cavity of a first limiting groove, an iron sheet can be taken out of an inner cavity of a first containing groove only through a magnet, and the anti-theft performance of the anti-theft device is further improved; if the thief does not move the second limiting plate and then moves the lock rod, the fixed disc can make contact with the induction block, at the moment, the induction block can transmit a signal to the buzzer, and the buzzer gives out a sound alarm.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical anti-theft, in particular to a mechanical anti-theft device. Background Art

[0002] Mechanical anti-theft devices physically lock key car components, such as steering wheels, wheels, transmissions, etc., to prevent the car from being stolen. Its main function is to increase the difficulty of stealing the car and make it difficult for thieves to drive away the car.

[0003] After searching, the patent document with publication number CN113942109A discloses a construction machinery management anti-theft device, which includes a device body, a placement opening is opened on the front side of the device body, a mounting plate is fixed to the bottom, mounting holes are opened through the four corners of the mounting plate, and a positioning lock is embedded in the left side of the device body.

[0004] The anti-theft management device for construction machinery can install the device body on the ground by setting a mounting plate to prevent the device body from moving. At the same time, since the positioning column is a sliding type that passes through the gap part of the tire and cannot move after being locked by the positioning lock, and the gap between the two sides of the placement opening is also small, it can avoid the positioning column from being cut by the cutting device to improve the anti-theft effect of the device. At the same time, a protective plate can be set to protect the lock core to prevent external dust from entering the lock core and causing the positioning lock to be unable to open, thereby increasing the life of the positioning lock. The mechanical anti-theft device only uses a simple mechanical structure to prevent theft, and cannot warn people when encountering special circumstances, and is not safe enough. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art and solve the problem that the mechanical anti-theft device cannot sound an alarm, the present invention proposes a mechanical anti-theft device.

[0006] A mechanical anti-theft device comprises a bottom plate, a first lock plate and a second lock plate are fixedly installed on the top of the bottom plate, a second groove is formed on one side of the first lock plate, a third groove is formed on the inner surface of the second groove, a lock rod is slidably installed on the inner surface of the third groove, a fixed plate is fixedly installed on one end of the lock rod, a seventh groove is formed on one side of the second lock plate, a second limit plate is slidably installed on the inner surface of the seventh groove, and a first installation groove is formed on one side of the second lock plate; It also includes an alarm mechanism for burglar alarm; The anti-theft mechanism includes a sensing block, which is fixedly installed on one side of the seventh groove. A second placement groove is opened on one side of the second lock plate. A buzzer is fixedly installed on the inner surface of the second placement groove. A sealing disk is fixedly installed on the inner surface of the second placement groove. A plurality of sound holes are evenly opened on one side of the sealing disk.

[0007] Preferably, four supporting legs are evenly fixedly installed on the bottom of the base plate, a fixing plate is fixedly installed on the bottom of the supporting legs, a sealing plate is rotatably installed on the inner surface of the second groove, a first groove is opened on one side of the first lock plate, and a cover plate is slidably installed on the inner surface of the first groove.

[0008] Preferably, a fourth groove is formed at one end of the locking rod, a fifth groove is formed on the inner surface of the fourth groove, a sixth groove is formed on the outer surface of the locking rod, a first rack is fixedly mounted on the outer surface of the locking rod, and both sides of the fixed plate are chamfered.

[0009] Preferably, a key is slidably mounted on the inner surface of the fourth groove, a handle is fixedly connected to one end of the key, an eighth groove is formed on the outer surface of the key, and a stopper is slidably mounted on the inner surface of the eighth groove.

[0010] Preferably, a second mounting groove is provided on one side of the first lock plate, a gear is rotatably mounted on the inner surface of the second mounting groove, the gear is meshed with the first rack, a mounting block is fixedly mounted on the inner surface of the second mounting groove, a second rack is slidably mounted on the inner surface of the mounting block, and the second rack is meshed with the gear.

[0011] Preferably, a ninth groove is provided inside the second lock plate, and two first limit plates are slidably installed on the inner surface of the ninth groove. A first through hole is provided on one side of the first limit plate, and a plurality of first springs are fixedly connected to the other side of the first limit plate, and one end of the plurality of first springs is fixedly installed on the inner surface of the ninth groove.

[0012] Preferably, a tenth groove is defined inside the second lock plate, the second limit plate is slidably mounted on the inner surface of the tenth groove, a second through hole is defined on one side of the second limit plate, a plurality of second springs are fixedly mounted on one side of the second limit plate, the plurality of second springs are fixedly mounted on the inner wall of the tenth groove, and a pressure block is slidably mounted on the top of the second limit plate.

[0013] Preferably, a sliding hole is provided on the top of the second lock plate, and the pressure block is slidably installed on the inner surface of the sliding hole. A first limiting groove is provided on one side of the pressure block, and a second limiting groove is provided on one side of the second lock plate. A limiting rod is slidably installed on the inner surfaces of the first limiting groove and the second limiting groove together, and a first placing groove is provided on one side of the second lock plate, and an iron sheet is slidably installed on the inner surface of the first placing groove, and the iron sheet is fixedly installed on one end of the limiting rod.

[0014] The present invention is beneficial in that: 1. The present invention connects the first lock plate and the second lock plate through a lock rod to lock the wheel between the first lock plate and the second lock plate. The cover plate can visually increase the anti-theft difficulty of the anti-theft device and prevent thieves from directly cutting the lock rod to steal.

[0015] 2. The present invention rotates the lock rod through the eighth groove, and the lock rod rotates the first rack. The first rack meshes with the gear, and the gear meshes with the second rack to drive the second rack to move to the inner cavity of the sixth groove, thereby preventing the lock rod from moving at will. At the same time, when the lock rod needs to be taken out, the second rack can be moved away from the sixth groove by rotating the key in the opposite direction.

[0016] 3. The present invention pushes the second through hole of the second limit plate through the pressure block to wrap the outer surface of the lock rod, and by inserting the limit rod into the inner cavity of the first limit groove, the sliding of the pressure block and the second limit plate is restricted, and a magnet is required to remove the iron sheet from the inner cavity of the first placement groove, thereby further improving the anti-theft performance of the anti-theft device. If the thief moves the lock rod without removing the second limit plate first, the fixed plate will contact the sensing block, and the sensing block will transmit a signal to the buzzer, which will sound a warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the connection structure of two lock plates according to an embodiment of the present invention; Figure 3 A schematic diagram of a locking rod structure according to an embodiment of the present invention; Figure 4 A schematic diagram of a key structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the second installation slot according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of the ninth groove according to an embodiment of the present invention; Figure 7 A schematic diagram of the sliding structure of the second limit plate according to an embodiment of the present invention; Figure 8 The figure is a schematic diagram of the installation structure of a buzzer according to an embodiment of the present invention.

[0019] In the figure: 1, bottom plate; 2, supporting leg; 21, fixing plate; 3, first locking plate; 31, first groove; 311, cover plate; 32, second groove; 321, sealing plate; 33, third groove; 34, first mounting groove; 35, second mounting groove; 4, locking rod; 41, fourth groove; 42, fifth groove; 43, sixth groove; 44, first rack; 45, gear; 46, fixing plate; 47, key; 471, grip; 472, eighth groove; 473, stopper; 48, mounting block; 49, second rack; 5 , second locking plate; 501, seventh groove; 51, ninth groove; 52, first limiting plate; 53, first through hole; 54, first spring; 55, tenth groove; 551, second limiting plate; 552, second spring; 5511, second through hole; 56, sliding hole; 561, pressure block; 5611, first limiting groove; 5612, second limiting groove; 5613, limiting rod; 57, first placement groove; 571, iron sheet; 6, induction block; 61, second placement groove; 62, buzzer; 63, sealing disk; 64, sound hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figures 1 to 8 As shown, a mechanical anti-theft device comprises a base plate 1, a first lock plate 3 and a second lock plate 5 are fixedly installed on the top of the base plate 1, a second groove 32 is provided on one side of the first lock plate 3, a third groove 33 is provided on the inner surface of the second groove 32, a lock rod 4 is slidably installed on the inner surface of the third groove 33, a fixed plate 46 is fixedly installed on one end of the lock rod 4, a seventh groove 501 is provided on one side of the second lock plate 5, a second limiting plate 551 is slidably installed on the inner surface of the seventh groove 501, and a first installation groove 34 is provided on one side of the second lock plate 5; an alarm mechanism is also included for anti-theft alarm; the anti-theft mechanism comprises a sensor block 6, the sensor block 6 is fixedly installed on one side of the seventh groove 501, a second placement groove 61 is provided on one side of the second lock plate 5, a buzzer 62 is fixedly installed on the inner surface of the second placement groove 61, a sealing disk 63 is fixedly installed on the inner surface of the second placement groove 61, and a plurality of sound holes 64 are evenly opened on one side of the sealing disk 63.

[0022] The existing mechanical anti-theft device only uses a simple mechanical locking method to prevent theft, and lacks the function of warning the thief and reminding other people in special circumstances.

[0023] When the present invention is in use, the wheel is first driven between the first lock plate 3 and the second lock plate 5, and then the lock rod 4 is passed through the third groove 33. The fixed plate 46 is installed in the inner cavity of the first installation groove 34. The second limit plate 551 in the inner cavity of the first installation groove 34 will be on the outside of the fixed plate 46, and when the locking is completed, the second limit plate 551 does not contact the fixed plate 46, and the sensor block 6 does not contact the fixed plate 46. At this time, the wheel is locked. At this time, the sensor block 6 is in an alert state. At this time, if an object, that is, the fixed plate 46, touches the sensor block 6, the sensor block 6 will send a signal to the buzzer 62, and then the buzzer 62 will sound to alert the thief and security personnel, thereby providing a guarantee for the safety of the vehicle. The first installation groove 34 does not penetrate the second lock plate 5.

[0024] Further, such as Figure 1 As shown, four supporting legs 2 are evenly fixedly installed on the bottom of the base plate 1, a fixing plate 21 is fixedly installed on the bottom of the supporting leg 2, a sealing plate 321 is rotatably installed on the inner surface of the second groove 32, a first groove 31 is opened on one side of the first locking plate 3, and a cover plate 311 is slidably installed on the inner surface of the first groove 31.

[0025] When the present invention is in use, the cover plate 311 is on the top of the locking rod 4, and one end of the cover plate 311 is against the side wall of the second locking plate 5. The cover plate 311 blocks the locking rod 4, which can increase the difficulty of theft. At the same time, the bottom of the anti-theft device is underground, and the fixing plate 21 and the supporting leg 2 are buried underground, which can prevent thieves from stealing the anti-theft device together with the anti-theft device, thereby increasing the safety of the anti-theft device.

[0026] Further, such as Figures 2 to 5 As shown, a fourth groove 41 is formed at one end of the locking rod 4, a fifth groove 42 is formed on the inner surface of the fourth groove 41, a sixth groove 43 is formed on the outer surface of the locking rod 4, a first rack 44 is fixedly mounted on the outer surface of the locking rod 4, and both sides of the fixing plate 46 are chamfered; A key 47 is slidably mounted on the inner surface of the fourth groove 41, and a handle 471 is fixedly connected to one end of the key 47. An eighth groove 472 is formed on the outer surface of the key 47, and a stopper 473 is slidably mounted on the inner surface of the eighth groove 472. A second mounting groove 35 is provided on one side of the first lock plate 3, a gear 45 is rotatably mounted on the inner surface of the second mounting groove 35, the gear 45 is meshed with the first rack 44, a mounting block 48 is fixedly mounted on the inner surface of the second mounting groove 35, a second rack 49 is slidably mounted on the inner surface of the mounting block 48, the second rack 49 is meshed with the gear 45.

[0027] When the present invention is in use, during installation, the staff holds the handle 471 and inserts the key 47 into the fourth groove 41. During this process, the block 473 is in the inner cavity of the eighth groove 472. When the block 473 moves to the top of the fifth groove 42, the block 473 rotates and falls into the inner cavity of the fifth groove 42 under the action of gravity. At this time, the handle 471 can be rotated counterclockwise and the lock rod 4 will also rotate. As the lock rod 4 rotates, the first rack 44 engages with the gear 45 to drive the gear 45 to rotate in the inner cavity of the second installation groove 35, and the second rack 49 engages with the gear 45, so the second rack 49 will slide at the bottom of the installation block 48, and the second rack 49 will slide to the inner cavity of the sixth groove 43. This restricts the lock rod 4, making it impossible for the lock rod 4 to escape from the third groove 33. Then the key 47 is pulled out of the fourth groove 41 to achieve locking and anti-theft.

[0028] Further, such as Figure 6 As shown, a ninth groove 51 is defined inside the second locking plate 5, and two first limit plates 52 are slidably mounted on the inner surface of the ninth groove 51. A first through hole 53 is defined on one side of the first limit plate 52, and a plurality of first springs 54 are fixedly connected to the other side of the first limit plate 52, and one end of the plurality of first springs 54 are fixedly mounted on the inner surface of the ninth groove 51.

[0029] When the present invention is in use, when the locking rod 4 is installed, the fixed disk 46 first presses against the two first limit plates 52, and the first springs 54 on both sides are pressed and contracted. After the fixed disk 46 passes through the inner cavity of the first installation groove 34, since the diameter of the fixed disk 46 is larger than the diameter of the locking rod 4, the two first limit plates 52 will approach each other under the action of the first spring 54 and wrap around the outer surface of the locking rod 4. This can block the internal structure of the first installation groove 34 and increase the difficulty of theft. In addition, the edge of the first through hole 53 is chamfered to facilitate the staff to normally install and disassemble the locking rod 4 and the fixed disk 46.

[0030] Further, such as Figure 7 As shown, a tenth groove 55 is formed inside the second lock plate 5, the second limiting plate 551 is slidably mounted on the inner surface of the tenth groove 55, a second through hole 5511 is formed on one side of the second limiting plate 551, a plurality of second springs 552 are fixedly mounted on one side of the second limiting plate 551, and a plurality of second springs 552 are fixedly mounted on the inner wall of the tenth groove 55, and a pressing block 561 is slidably mounted on the top of the second limiting plate 551; A sliding hole 56 is provided at the top of the second lock plate 5, and the pressure block 561 is slidably installed on the inner surface of the sliding hole 56. A first limiting groove 5611 is provided on one side of the pressure block 561, and a second limiting groove 5612 is provided on one side of the second lock plate 5. A limiting rod 5613 is slidably installed on the inner surfaces of the first limiting groove 5611 and the second limiting groove 5612 together. A first placement groove 57 is provided on one side of the second lock plate 5, and an iron sheet 571 is slidably installed on the inner surface of the first placement groove 57. The iron sheet 571 is fixedly installed on one end of the limiting rod 5613.

[0031] When the present invention is in use, when locking is completed, the fixed plate 46 is in the inner cavity of the first installation groove 34, that is, between the second limiting plate 551 and the inner wall of the first installation groove 34. At this time, the pressing block 561 is pressed downward, and the pressing block 561 slides on the inner surface of the sliding hole 56. The pressing block 561 pushes the second limiting plate 551 to slide on the inner surface of the tenth groove 55. At this time, the second spring 552 is in a stretched state, and the second spring 552 has a pulling force on the second limiting plate 551. At this time, the second limiting plate 551 will squeeze the pressing block 561 upward, and then push the limiting rod 5613 to make the limiting rod 5613 slide on the inner surface of the second limiting groove 5612. One end of the limiting rod 5613 is In the inner cavity of the first limiting groove 5611, the limiting rod 5613 plays the role of limiting the pressing block 561. At this time, the iron sheet 571 will be on the inner surface of the first placement groove 57, and the outer wall of the iron sheet 571 and the side wall of the second lock plate 5 are in the same horizontal plane. At this time, the iron sheet 571 cannot be directly pulled, but the iron sheet 571 can be adsorbed by the magnet, and then the limiting rod 5613 can be pulled out. When it is necessary to move out the fixed disk 46, the limiting rod 5613 is first moved out from the inner surface of the second limiting groove 5612. Under the action of the second spring 552, the second limiting plate 551 slides on the inner surface of the tenth groove 55, and the second limiting plate 551 no longer restricts the fixed disk 46.

[0032] Working principle: first bury the supporting leg 2 and the fixing plate 21 underground, then place the wheel between the first locking plate 3 and the second locking plate 5, first pass the locking rod 4 through the third groove 33, and place the fixing plate 46 in the inner cavity of the first mounting groove 34, then press down the pressure block 561, the pressure block 561 drives the second limiting plate 551 to slide in the inner cavity of the tenth groove 55, and the second through hole 5511 is wrapped around the outer surface of the locking rod 4, and then push the limiting rod 5613 to limit the pressure block 561 so that the pressure block 561 cannot move. During installation, the key 47 rotates on the inner surface of the fourth groove 41, further rotating the locking rod 4, and when the locking rod 4 rotates, the first rack 44 engages with the gear 45 to further drive the gear 45 to rotate, and the gear 45 engages with the second rack 49 to drive the second rack 49 to slide, and the second rack 49 slides to the inner cavity of the sixth groove 43, and the key 47 is taken out of the fourth groove 41, and the sealing plate 321 is closed to complete the locking.

[0033] When unlocking is required, first insert the key 47 into the fourth groove 41, and the stopper 473 rotates to the inner cavity of the fifth groove 42. At this time, the lock rod 4 can be rotated by the key 47, and the lock rod 4 with the first rack 44 is meshed with the gear 45 again to further drive the second rack 49 to disengage from the sixth groove 43. Then, the limiting rod 5613 is taken out from the inner cavity of the second limiting groove 5612. Due to the loss of restriction, the second spring 552 will pull the second limiting plate 551, and the second limiting plate 551 will lift the pressing block 561. The second limiting plate 551 slides with the sensing block 6 to make room for the fixed plate 46. Sufficient space is left to facilitate the removal of the locking rod 4 and the fixed disk 46. When encountering an abnormal unlocking procedure, the cover plate 311 can limit the behavior of directly cutting the locking rod 4. For thieves who are not familiar with the anti-theft structure, directly moving the locking rod 4 will cause the fixed disk 46 to contact the sensor block 6, and the sensor block 6 will transmit the signal to the buzzer 62, and the buzzer 62 will sound an alarm. The sealing disk 63 and the sound hole 64 can not only transmit the sound of the buzzer 62, but also protect the buzzer 62 to prevent the thief from destroying the buzzer 62 first.

[0034] Since the structure of the buzzer 62 belongs to the prior art, it is not described in the present invention document.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A mechanical anti-theft device, comprising a base plate (1), a first lock plate (3) and a second lock plate (5) being fixedly mounted on the top of the base plate (1), a second groove (32) being formed on one side of the first lock plate (3), a third groove (33) being formed on the inner surface of the second groove (32), a lock rod (4) being slidably mounted on the inner surface of the third groove (33), a fixed plate (46) being fixedly mounted on one end of the lock rod (4), a seventh groove (501) being formed on one side of the second lock plate (5), a second limit plate (551) being slidably mounted on the inner surface of the seventh groove (501), and a first mounting groove (34) being formed on one side of the second lock plate (5); It also includes an alarm mechanism for burglar alarm; Features: The anti-theft mechanism comprises a sensing block (6), the sensing block (6) being fixedly mounted on one side of the seventh groove (501), a second placement groove (61) being provided on one side of the second lock plate (5), a buzzer (62) being fixedly mounted on the inner surface of the second placement groove (61), a sealing disk (63) being fixedly mounted on the inner surface of the second placement groove (61), and a plurality of sound outlet holes (64) being evenly disposed on one side of the sealing disk (63).

2. A mechanical anti-theft device according to claim 1, characterized in that: Four supporting legs (2) are evenly and fixedly mounted on the bottom of the base plate (1); a fixing plate (21) is fixedly mounted on the bottom of the supporting legs (2); a sealing plate (321) is rotatably mounted on the inner surface of the second groove (32); a first groove (31) is formed on one side of the first locking plate (3); and a cover plate (311) is slidably mounted on the inner surface of the first groove (31).

3. A mechanical anti-theft device according to claim 2, characterized in that: A fourth groove (41) is formed at one end of the locking rod (4), a fifth groove (42) is formed on the inner surface of the fourth groove (41), a sixth groove (43) is formed on the outer surface of the locking rod (4), a first rack (44) is fixedly mounted on the outer surface of the locking rod (4), and both sides of the fixing plate (46) are chamfered.

4. A mechanical anti-theft device according to claim 3, characterized in that: A key (47) is slidably mounted on the inner surface of the fourth groove (41), one end of the key (47) is fixedly connected to a handle (471), an eighth groove (472) is formed on the outer surface of the key (47), and a stopper (473) is slidably mounted on the inner surface of the eighth groove (472).

5. A mechanical anti-theft device according to claim 4, characterized in that: A second mounting groove (35) is provided on one side of the first locking plate (3); a gear (45) is rotatably mounted on the inner surface of the second mounting groove (35); the gear (45) and the first rack (44) are meshed with each other; a mounting block (48) is fixedly mounted on the inner surface of the second mounting groove (35); a second rack (49) is slidably mounted on the inner surface of the mounting block (48); the second rack (49) and the gear (45) are meshed with each other.

6. A mechanical anti-theft device according to claim 5, characterized in that: A ninth groove (51) is formed inside the second lock plate (5), and two first limit plates (52) are slidably mounted on the inner surface of the ninth groove (51). A first through hole (53) is formed on one side of the first limit plate (52), and a plurality of first springs (54) are fixedly connected to the other side of the first limit plate (52), and one end of the plurality of first springs (54) is fixedly mounted on the inner surface of the ninth groove (51).

7. A mechanical anti-theft device according to claim 6, characterized in that: A tenth groove (55) is formed inside the second locking plate (5), the second limiting plate (551) is slidably mounted on the inner surface of the tenth groove (55), a second through hole (5511) is formed on one side of the second limiting plate (551), a plurality of second springs (552) are fixedly mounted on one side of the second limiting plate (551), the plurality of second springs (552) are fixedly mounted on the inner wall of the tenth groove (55), and a pressing block (561) is slidably mounted on the top of the second limiting plate (551).

8. A mechanical anti-theft device according to claim 7, characterized in that: A sliding hole (56) is provided at the top of the second lock plate (5), the pressing block (561) is slidably mounted on the inner surface of the sliding hole (56), a first limiting groove (5611) is provided on one side of the pressing block (561), a second limiting groove (5612) is provided on one side of the second lock plate (5), a limiting rod (5613) is slidably mounted on the inner surfaces of the first limiting groove (5611) and the second limiting groove (5612), a first placing groove (57) is provided on one side of the second lock plate (5), an iron sheet (571) is slidably mounted on the inner surface of the first placing groove (57), and the iron sheet (571) is fixedly mounted on one end of the limiting rod (5613).

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