CN114014217A

CN114014217A - Backpack AGV car

Info

Publication number: CN114014217A
Application number: CN202111161938.8A
Authority: CN
Inventors: 汪文平; 田原; 薄睿; 单义雪; 汪升鹏
Original assignee: Ningbo Liftstar Material Handling Equipment Co ltd
Current assignee: Ningbo Liftstar Material Handling Equipment Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-02-08
Anticipated expiration: 2041-09-30
Also published as: CN114014217B

Abstract

The invention provides a backpack AGV: comprises a frame, a lifting mechanism, a driving mechanism, a guiding mechanism and a power supply, wherein the lifting mechanism, the driving mechanism, the guiding mechanism and the power supply are arranged on the frame; the guiding mechanism comprises a magnetic stripe inductor and a controller which are arranged on the frame, and the magnetic stripe inductor is electrically connected with the controller. The magnetic strip sensors are two pairs, one pair of magnetic strip sensors are distributed at intervals along the front and rear direction of the frame, the other pair of magnetic strip sensors are distributed at intervals along the left and right direction of the frame, and the interval size between each pair of magnetic strip sensors is larger than the width size of the magnetic strip laid on the ground; the magnetic stripe inductor is used for discerning and lays subaerial magnetic stripe to with received signal transmission to controller, the controller turns to the motor according to received signal control, and through turning to the direction of advance of motor in time adjustment wheel, avoids the AGV car to break away from the magnetic stripe route, ensures conveying efficiency.

Description

Backpack AGV car

Technical Field

The invention relates to the technical field of logistics automation, in particular to a backpack AGV.

Background

In the logistics storage process, products are often required to be transported for multiple times, and AGV cars are often used during product transportation. An AGV is a transport vehicle equipped with an electromagnetic or optical automatic navigation device, capable of traveling along a predetermined route without piloting, and having a carrying function. Because of its convenient and fast, and save labour cost, be widely used in various storage logistics.

The guiding mode of the AGV generally comprises the steps of paving magnetic strips on the ground along a preset route, and then identifying the magnetic strips on the ground through a magnetic strip inductor, so that the AGV moves along magnetic strip tracks without manual guidance. However, at the in-process that the AGV car went, if there is the foreign matter to drop on the magnetic stripe orbit, perhaps the AGV car wipes and touches other things, just can lead to the deviation to appear in the direction of travel of AGV, if the speed of traveling is too fast, makes the magnetic stripe inductor break away from the scope of discernment magnetic stripe very easily to lead to the transportation to interrupt, need the workman from the position of new adjustment AGV, waste time and energy. In addition, when the AGV turns to, the goods that bear drop easily, influence conveying efficiency.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the backpack AGV has the advantages that the defects of the prior art are overcome, the driving direction can be timely adjusted in the driving process, and the deviation of the driving path is avoided.

The technical scheme of the invention is to provide a backpack AGV with the following structure: comprises a frame, a lifting mechanism, a driving mechanism and a guiding mechanism, wherein the lifting mechanism, the driving mechanism and the guiding mechanism are arranged on the frame;

the lifting mechanism comprises a lifting plate and a hydraulic lifting rod, one end of the hydraulic lifting rod is connected with the frame, and the other end of the hydraulic lifting rod is connected with the lifting plate and used for lifting or lowering the lifting plate;

the driving mechanism comprises a driving motor, a steering motor, a wheel frame and wheels; the wheels are arranged on the wheel frame, the wheel frame is connected to the frame, and the wheel frame can rotate in the circumferential direction; the driving motor is arranged on the wheel frame, is in transmission connection with the wheels and is used for driving the wheels to rotate; the steering motor is arranged on the frame, is in transmission connection with the wheel frame and is used for driving the wheel frame and the wheels to steer;

the guiding mechanism comprises a magnetic stripe inductor and a controller which are arranged on the frame, and the magnetic stripe inductor, the driving motor and the steering motor are all electrically connected with the controller; the magnetic strip sensors are two pairs, one pair of magnetic strip sensors are distributed at intervals along the front and rear direction of the frame, the other pair of magnetic strip sensors are distributed at intervals along the left and right direction of the frame, and the interval size between each pair of magnetic strip sensors is larger than the width size of the magnetic strip laid on the ground; the magnetic stripe inductor is used for identifying a magnetic stripe paved on the ground and transmitting a received signal to the controller, and the controller controls the steering motor according to the received signal and timely adjusts the advancing direction of the wheels through the steering motor.

After adopting the structure, compared with the prior art, the backpack AGV has the following advantages:

the lifting mechanism is used for bearing goods and lifting the goods, the driving mechanism is used for driving the AGV to move and turn, and the guiding mechanism is used for guiding the AGV to run along a preset route. Two pairs of magnetic stripe inductors are arranged at the bottom of the frame, wherein a pair of magnetic stripe inductors which are distributed at intervals along the left and right directions of the frame can identify the magnetic stripe which extends along the front and back directions of the frame, and a pair of magnetic stripe inductors which are distributed at intervals along the front and back directions of the frame can identify the magnetic stripe which extends along the left and right directions of the frame. The in-process that traveles at the AGV car has corresponding a pair of magnetic stripe inductor discernment magnetic stripe route, when the AGV car traveles the turning point department on magnetic stripe route, the frame is motionless, only needs to turn to 90 degrees with the wheel, switch another a pair of magnetic stripe inductor discernment new magnetic stripe route can, the frame need not to follow and turns to, can avoid the article on the AGV car to drop. In addition, the interval size of every magnetic stripe inductor is greater than the width size of magnetic stripe, can in time adjust the wheel direction through turning to the motor like this when the AGV car skew magnetic stripe route, avoids the AGV car to break away from the magnetic stripe route, ensures conveying efficiency.

Preferably, the frame is further provided with at least one RFID communicator, and the RFID communicator is electrically connected with the controller; the RFID communicator is used for receiving signals in the electronic tags and transmitting the received signals to the controller, and the controller controls the driving mechanism to make instructions sent out by the electronic tags according to the received signals. The magnetic strip path is provided with an electronic tag, the RFID communicator can identify an instruction sent by the electronic tag, and the controller controls the driving mechanism, for example, the driving mechanism controls the rotation, stop and steering of the wheels.

Preferably, the number of the RFID communicators is four, two of the RFID communicators are arranged in the middle of the bottom of the vehicle frame, and the other two RFID communicators are respectively arranged on the left side and the right side of the bottom of the vehicle frame. Therefore, after the AGV turns leftwards or rightwards, the RFID communicators on the two sides of the bottom of the frame can timely identify the electronic tags on the magnetic stripe path.

Preferably, an output shaft of the steering motor is connected with a driving gear, the wheel frame is connected with a driven gear, and the driving gear is in meshing transmission with the driven gear.

Preferably, the number of the driving mechanisms is three, and the corresponding wheels are driven synchronously.

Preferably, the lifting mechanism further comprises a lifting guide sleeve, one end of the lifting guide sleeve is connected with the frame, and the other end of the lifting guide sleeve is connected with the lifting plate and used for achieving a vertical guide effect when the lifting plate is lifted or lowered.

Preferably, the lifting guide sleeve comprises an inner cylinder and an outer cylinder; the outer barrel is vertically arranged on the frame, one end of the inner barrel is arranged at the bottom of the lifting plate, and the other end of the inner barrel is connected in the outer barrel in a sliding mode.

Preferably, the number of the lifting guide sleeves is four, and the four lifting guide sleeves are respectively arranged at four corners of the lifting plate. The lifting guide sleeves at the four corners of the lifting plate also have a certain supporting effect, so that the lifting plate can be prevented from being inclined due to uneven weight distribution of the goods on the lifting plate.

Preferably, the frame is further provided with a power supply and a power supply fixing device, the power supply fixing device comprises a back plate and two side plates, the back plate, the two side plates and the frame enclose a containing space with an opening on the front surface, and the containing space is used for containing the power supply; the two side plates are respectively provided with a lock catch component, and the lock catch components are provided with blocking parts which can stretch into or move out of the front opening and are used for blocking the power supply in the accommodating space from being separated from the front opening. The power supply is a storage battery and is used for providing power for the lifting mechanism, the driving mechanism and the guide mechanism.

Preferably, the locking assembly comprises a U-shaped lock body, a rotating shaft hole and a locking hole which are arranged on the side plate, and the axes of the rotating shaft hole and the locking hole are arranged in parallel; the fixed end of the U-shaped lock body is rotatably connected in the rotating shaft hole and can slide up and down along the axis direction of the rotating shaft hole; the end part of the fixed end of the U-shaped lock body is connected with a limiting block, and the outer diameter of the limiting block is larger than the inner diameter of the rotating shaft hole and used for preventing the fixed end of the U-shaped lock body from falling out of the rotating shaft hole; when the U-shaped lock body is pulled upwards along the axis direction of the rotating shaft hole to enable the limiting block to be abutted against the bottom of the rotating shaft hole, the bottom of the free end of the U-shaped lock body is located above the plane where the top of the locking hole is located; the blocking part is arranged on the U-shaped lock body and used for extending into or moving out of the front opening along with the rotation of the U-shaped lock body; when the free end of the U-shaped lock body is inserted into the locking hole, the blocking part extends into the front opening. The power supply on the AGV car is usually a rechargeable storage battery, and because the storage battery has long charging time, in order to ensure the working efficiency, when the storage battery has insufficient power, the fully charged storage battery is directly replaced by a commonly adopted method without waiting for the overlong charging time. In order to guarantee the stability of AGV car operation in-process battery, the battery on the AGV car needs fixed firm when the installation, but the battery on the current AGV usually fixes through the cooperation of baffle and bolt, still need carry out the dismouting with the help of extracting tool when changing the battery. In the invention, the blocking part is driven to extend into or move out of the front opening by rotating the U-shaped lock body, so that the access passage of the storage battery is closed or opened, the structure is simple, and the power supply is convenient to disassemble, assemble and replace.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic view of another embodiment of the present invention.

Fig. 3 is a structural schematic view in the bottom view direction of the present invention.

Fig. 4 is a schematic structural view of the power supply fixing device of the present invention.

Fig. 5 is a schematic structural view of the locking assembly of the present invention.

Description of reference numerals:

1. the automobile frame comprises a frame body, 2, a lifting mechanism, 200, a lifting plate, 201, a hydraulic lifting rod, 202, a lifting guide sleeve, 203, an inner cylinder, 204, an outer cylinder, 3, a driving mechanism, 300, a driving motor, 301, a steering motor, 302, a wheel frame, 303, wheels, 304, a driving gear, 305, a driven gear, 4, a guide mechanism, 400, a magnetic stripe sensor, 401, an RFID communicator, 5, a power supply, 6, a power supply fixing device, 600, a back plate, 601, side plates, 602, an accommodating space, 603, a locking assembly, 604, a blocking part, 605, a U-shaped lock body, 606, a rotating shaft hole, 607, a locking hole, 608, a limiting block, 609, a spring, 610, a fixed end, 611 and a free end.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus are not to be construed as limiting the present invention, and the terms "first", "second", etc. are only names for distinguishing parts and have no primary or secondary relationship, and thus are not to be construed as limiting the present invention.

As shown in fig. 1, 2, 3, 4 and 5;

the invention discloses a backpack AGV: comprises a frame 1, a lifting mechanism 2, a driving mechanism 3, a guiding mechanism 4 and a power supply 5, wherein the lifting mechanism 2, the driving mechanism 3, the guiding mechanism 4 and the power supply 5 are arranged on the frame 1; the lifting mechanism 2 is used for bearing goods and lifting the goods, the driving mechanism 3 is used for driving the AGV to move and turn, the guiding mechanism 4 is used for guiding the AGV to run along a preset route, and the power supply 5 is used for providing power for the lifting mechanism 2, the driving mechanism 3 and the guiding mechanism 4.

The lifting mechanism 2 includes a lifting plate 200, a hydraulic lifting rod 201, and four lifting guide sleeves 202. One end of the hydraulic lifting rod 201 is connected with the frame 1, and the other end is connected with the lifting plate 200, and is used for lifting or lowering the lifting plate 200. The four lifting guide sleeves 202 are respectively arranged at four corners of the lifting plate 200, the lower ends of the lifting guide sleeves 202 are connected with the frame 1, and the upper ends of the lifting guide sleeves 202 are connected with the lifting plate 200 and used for achieving a vertical guide effect when the lifting plate 200 is lifted or lowered. The lifting guide sleeve 202 comprises an inner cylinder 203 and an outer cylinder 204, the outer cylinder 204 is vertically arranged on the frame 1, one end of the inner cylinder 203 is arranged at the bottom of the lifting plate 200, and the other end is slidably connected in the outer cylinder 204. The lift guide sleeves 202 at the four corners of the lift plate 200 not only have a vertical guide function, but also have a certain supporting function, so as to prevent the lift plate 200 from being inclined due to uneven weight distribution of the goods on the lift plate 200.

The drive mechanism 3 includes a drive motor 300, a steering motor 301, a wheel frame 302, and wheels 303. The wheels 303 are mounted on the wheel frame 302, the wheel frame 302 is connected to the frame 1, and the wheel frame 302 can rotate circumferentially. The driving motor 300 is installed on the wheel frame 302 and is in transmission connection with the wheel 303 for driving the wheel 303 to rotate. The steering motor 301 is mounted on the frame 1, and is in transmission connection with the wheel frame 302, and is used for driving the wheel frame 302 and the wheels 303 to steer. An output shaft of the steering motor 301 is connected with a driving gear 304, a wheel frame 302 is connected with a driven gear 305, and the driving gear 304 is in meshing transmission with the driven gear 305. The drive mechanism 3 has three in total, and synchronously drives the corresponding wheels 303.

The guiding mechanism 4 comprises a magnetic strip inductor 400 and a controller which are arranged on the vehicle frame 1, and the magnetic strip inductor 400, the driving motor 300 and the steering motor 301 are all connected with the controller through wires. The magnetic stripe inductors 400 are two pairs, wherein one pair of magnetic stripe inductors 400 are distributed at intervals along the front and back direction of the frame 1, the other pair of magnetic stripe inductors 400 are distributed at intervals along the left and right direction of the frame 1, and the interval between each pair of magnetic stripe inductors 400 is larger than the width of the magnetic stripe paved on the ground. The magnetic strip sensor 400 is used for identifying a magnetic strip laid on the ground and transmitting a received signal to the controller, and the controller controls the steering motor 301 according to the received signal and timely adjusts the advancing direction of the wheels 303 through the steering motor 301.

The bottom of the frame 1 is also provided with four RFID communicators 401, two of the RFID communicators 401 are arranged in the middle of the bottom of the frame 1, the other two RFID communicators are respectively arranged at the left side and the right side of the bottom of the frame 1, and the four RFID communicators 401 are connected with the controller through wires. The RFID communicator 401 is configured to receive a signal in the electronic tag and transmit the received signal to the controller, and the controller controls the driving mechanism 3 to make an instruction issued in the electronic tag according to the received signal, for example, controls the rotation, stop, and steering of the wheel 303 through the driving mechanism 3. The RFID communicators 401 at the left side and the right side of the bottom of the frame 1 can enable the AGV to timely identify the electronic tags on the left magnetic stripe path and the right magnetic stripe path after turning left or right.

The bottom of the vehicle frame 1 is provided with two pairs of magnetic stripe sensors 400, wherein the pair of magnetic stripe sensors 400 which are distributed at intervals along the left and right directions of the vehicle frame 1 can identify the magnetic stripes which extend along the front and back directions of the vehicle frame 1, and the pair of magnetic stripe sensors 400 which are distributed at intervals along the front and back directions of the vehicle frame 1 can identify the magnetic stripes which extend along the left and right directions of the vehicle frame 1. There is corresponding a pair of magnetic stripe inductor 400 discernment magnetic stripe route at the in-process that the AGV car went, when the AGV car went the turning point department on magnetic stripe route, frame 1 was motionless, only need turn to 90 degrees with wheel 303, switch another a pair of magnetic stripe inductor 400 discernment new magnetic stripe route can, frame 1 need not and then turns to, can avoid the article on the AGV car to drop. In addition, the interval size of every pair of magnetic stripe inductor 400 is greater than the width size of magnetic stripe, can in time adjust the wheel 303 direction through steering motor 301 like this when the AGV car skew magnetic stripe route, avoids the AGV car to break away from the magnetic stripe route, ensures conveying efficiency. The RFID communicator 401 at the bottom of the vehicle frame 1 can recognize the instruction sent from the electronic tag on the magnetic stripe path, and controls the driving mechanism 3 through the controller, so as to realize the rotation, stop and steering of the wheels 303.

The frame 1 is further provided with a power supply fixing device 6, the power supply fixing device 6 comprises a back plate 600 and two side plates 601 which are arranged on the frame 1, and the back plate 600, the two side plates 601 and the frame 1 enclose a containing space 602 with an opening on the front surface for containing a power supply 5; the two side plates 601 are respectively provided with a locking assembly 603, and the locking assembly 603 is provided with a blocking portion 604 which can extend into or move out of the front opening and is used for blocking the power supply 5 in the accommodating space 602 from coming out of the front opening.

The locking assembly 603 comprises a U-shaped lock body 605, a rotating shaft hole 606 and a locking hole 607 which are arranged on the side plate 601, and the axes of the rotating shaft hole 606 and the locking hole 607 are arranged in parallel; the fixed end 610 of the U-shaped lock body 605 is rotatably connected in the rotating shaft hole 606 and can slide up and down along the axial direction of the rotating shaft hole 606; the end of the fixed end 610 of the U-shaped lock body 605 is connected with a limiting block 608, and the outer diameter of the limiting block 608 is larger than the inner diameter of the rotating shaft hole 606, so as to prevent the fixed end 610 of the U-shaped lock body 605 from coming out of the rotating shaft hole 606. The fixed end 610 of the U-shaped lock body 605 is also sleeved with a spring 609, the lower end of the spring 609 abuts against the limiting block 608, and the upper end of the spring 609 abuts against the bottom of the rotating shaft hole 606. When the U-shaped lock body 605 is pulled upwards along the axial direction of the rotating shaft hole 606 to enable the limiting block 608 to be abutted against the bottom of the rotating shaft hole 606, the bottom of the free end 611 of the U-shaped lock body 605 is located above the plane where the top of the locking hole 607 is located. A blocking portion 604 is provided on the U-lock 605 for extending into or out of the front opening as the U-lock 605 is rotated. When the free end 611 of the U-shaped lock body 605 is inserted into the locking hole 607, the blocking portion 604 protrudes into the front opening. The power supply 5 on the AGV is usually a rechargeable battery, and because the charging time of the battery is long, in order to ensure the working efficiency, when the power of the battery is insufficient, the fully charged battery is directly replaced by a commonly adopted method without waiting for the overlong charging time. In order to guarantee the stability of AGV car operation in-process battery, the battery on the AGV car needs fixed firm when the installation, but the battery on the current AGV usually fixes through the cooperation of baffle and bolt, still need carry out the dismouting with the help of extracting tool when changing the battery. In the invention, the U-shaped lock body 605 is pulled upwards, then the U-shaped lock body 605 is rotated to the position above the locking hole 607, and finally the U-shaped lock body 605 is lowered to enable the free end 611 of the U-shaped lock body 605 to be inserted into the locking hole 607, and at the moment, the blocking part 604 on the U-shaped lock body 605 extends into the front opening, so that the access passage of the power supply 5 is closed, and the power supply 5 is prevented from being pulled out.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention, and therefore, the scope of the present invention shall be subject to the claims.

Claims

1. The utility model provides a backpack AGV car which characterized in that: comprises a frame (1), and a lifting mechanism (2), a driving mechanism (3) and a guiding mechanism (4) which are arranged on the frame (1);

the lifting mechanism (2) comprises a lifting plate (200) and a hydraulic lifting rod (201), one end of the hydraulic lifting rod (201) is connected with the frame (1), and the other end of the hydraulic lifting rod is connected with the lifting plate (200) and used for lifting or lowering the lifting plate (200);

the driving mechanism (3) comprises a driving motor (300), a steering motor (301), a wheel frame (302) and wheels (303); the wheels (303) are arranged on the wheel frames (302), the wheel frames (302) are connected to the frame (1), and the wheel frames (302) can rotate in the circumferential direction; the driving motor (300) is arranged on the wheel frame (302), is in transmission connection with the wheels (303) and is used for driving the wheels (303) to rotate; the steering motor (301) is arranged on the frame (1), is in transmission connection with the wheel frame (302), and is used for driving the wheel frame (302) and the wheels (303) to steer;

the guide mechanism (4) comprises a magnetic stripe inductor (400) and a controller which are arranged on the frame (1), and the magnetic stripe inductor (400), the driving motor (300) and the steering motor (301) are electrically connected with the controller; the magnetic strip sensors (400) are arranged in two pairs, one pair of magnetic strip sensors (400) are distributed at intervals along the front-back direction of the frame (1), the other pair of magnetic strip sensors (400) are distributed at intervals along the left-right direction of the frame (1), and the interval size between each pair of magnetic strip sensors (400) is larger than the width size of the magnetic strip laid on the ground; the magnetic strip sensor (400) is used for identifying a magnetic strip paved on the ground and transmitting a received signal to the controller, and the controller controls the steering motor (301) according to the received signal and timely adjusts the advancing direction of the wheels (303) through the steering motor (301).

2. The piggyback AGV of claim 1, wherein: the frame (1) is also provided with at least one RFID communicator (401), and the RFID communicator (401) is electrically connected with the controller; the RFID communicator (401) is used for receiving signals in the electronic tag and transmitting the received signals to the controller, and the controller controls the driving mechanism (3) to make instructions sent out in the electronic tag according to the received signals.

3. The piggyback AGV of claim 2, wherein: the number of the RFID communicators (401) is four, two of the RFID communicators are arranged in the middle of the bottom of the frame (1), and the other two RFID communicators are respectively arranged on the left side and the right side of the bottom of the frame (1).

4. The piggyback AGV of claim 3, wherein: an output shaft of the steering motor (301) is connected with a driving gear (304), the wheel frame (302) is connected with a driven gear (305), and the driving gear (304) is in meshing transmission with the driven gear (305).

5. The piggyback AGV of claim 4, wherein: the number of the driving mechanisms (3) is three, and the corresponding wheels (303) are driven synchronously.

6. The piggyback AGV of claim 1, wherein: the lifting mechanism (2) further comprises a lifting guide sleeve (202), one end of the lifting guide sleeve (202) is connected with the frame (1), and the other end of the lifting guide sleeve is connected with the lifting plate (200) and used for achieving a vertical guide effect when the lifting plate (200) is lifted or lowered.

7. The piggyback AGV of claim 6, wherein: the lifting guide sleeve (202) comprises an inner cylinder (203) and an outer cylinder (204); the outer cylinder (204) is vertically arranged on the frame (1), one end of the inner cylinder (203) is arranged at the bottom of the lifting plate (200), and the other end of the inner cylinder is connected in the outer cylinder (204) in a sliding manner.

8. The piggyback AGV of claim 7, wherein: the number of the lifting guide sleeves (202) is four, and the four lifting guide sleeves are respectively arranged at four corners of the lifting plate (200).

9. The piggyback AGV of claim 1, wherein: the vehicle frame (1) is further provided with a power supply (5) and a power supply fixing device (6), the power supply fixing device (6) comprises a back plate (600) and two side plates (601) which are arranged on the vehicle frame (1), and the back plate (600), the two side plates (601) and the vehicle frame (1) are enclosed to form an accommodating space (602) with an opening in the front face for accommodating the power supply (5); the two side plates (601) are respectively provided with a lock catch component (603), and the lock catch components (603) are provided with blocking parts (604) which can extend into or move out of the front opening and are used for blocking the power supply (5) in the accommodating space (602) from coming out of the front opening.

10. The piggyback AGV of claim 9, wherein: the lock catch component (603) comprises a U-shaped lock body (605), a rotating shaft hole (606) and a locking hole (607) which are arranged on the side plate (601), and the axes of the rotating shaft hole (606) and the locking hole (607) are arranged in parallel; the fixed end (610) of the U-shaped lock body (605) is rotatably connected in the rotating shaft hole (606) and can slide up and down along the axial direction of the rotating shaft hole (606); the end part of the fixed end (610) of the U-shaped lock body (605) is connected with a limiting block (608), the outer diameter of the limiting block (608) is larger than the inner diameter of the rotating shaft hole (606), and the limiting block is used for preventing the fixed end (610) of the U-shaped lock body (605) from being separated from the rotating shaft hole (606); when the U-shaped lock body (605) is pulled upwards along the axis direction of the rotating shaft hole (606) to enable the limiting block (608) to be abutted against the bottom of the rotating shaft hole (606), the bottom of the free end (611) of the U-shaped lock body (605) is located above the plane where the top of the locking hole (607) is located; the blocking part (604) is arranged on the U-shaped lock body (605) and is used for extending into or moving out of the front opening along with the rotation of the U-shaped lock body (605); when the free end (611) of the U-shaped lock body (605) is inserted into the locking hole (607), the blocking part (604) extends into the front opening.