Traction type AGV trolley stable in consignment

Abstract

The utility model discloses a traction-type AGV (Automatic Guided Vehicle) with stable consignment, which belongs to the technical field of logistics transportation and comprises a main body, a driving device is arranged in the main body, and one end of a traction device is connected with the interior of the main body; the driving device comprises a laser radar, a magnetic conductor, a driving assembly, a lithium battery, an auxiliary wheel assembly and a control panel, the outer side of the laser radar is fixedly connected with the left end of the main body, and the lower end of the magnetic conductor is fixedly connected with the inner bottom of the left end of the main body. The device is simple in structure, stable and reliable, the consignment process is stable, accidents are avoided, and the situation of deviating from the track is avoided through magnetic conductance; by pushing the compression frame in the traction process, the traction ring of the trailer is locked by the locking frame, the situation of falling off in the consignment process is prevented, and by arranging the first spring, accidents caused by inertia of the trailer during parking are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of logistics handling, in particular to a traction-type AGV trolley with stable consignment. Background Art

[0002] In industrial production, in order to avoid product accumulation, products need to be transported to other places in a timely manner. Currently, the commonly used transportation methods are using forklifts or tractors.

[0003] For example, Chinese patent application CN218316993U discloses a traction device for an AGV transport vehicle, including a vehicle body, a turntable is arranged at the rear end of the top surface of the vehicle body, the top surface of the turntable is connected to an axle wheel, the outer surface of the axle wheel is connected to a belt, the rear end of the belt is connected to a stepper motor installed at the center of the top surface of the vehicle body, the top surface of the axle wheel is connected to an adjustment cylinder, and an electric telescopic rod is installed at the bottom of the inner side of the adjustment cylinder. The utility model starts the electric telescopic rod, and as the electric telescopic rod rises and falls, the support and the connecting rod connected to the support plate are driven to adjust the height. The inverted "T"-shaped structure of the support is similar to an equilateral triangle, and the center of gravity is more stable, which prevents the connecting rod connected to the hook from falling off due to the excessive weight of the AGV trolley after docking, so that the hook at the tail end of the connecting rod is synchronously raised and lowered to adjust the traction height.

[0004] However, when the AGV transport vehicle traction device is in use, the hook cannot lock the trailer, and there may be slippage during transportation. When the AGV transport vehicle traction device stops moving, the trailer will continue to move due to inertia, which may cause damage to the equipment or transported goods.

[0005] Based on this, the utility model designs a traction-type AGV trolley with stable consignment to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a traction-type AGV trolley with stable consignment.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A traction-type AGV trolley with stable transportation, comprising a main body,

[0009] A driving device is installed inside the main body, and one end of the traction device is connected to the inside of the main body;

[0010] The driving device includes a laser radar, a magnetic guide, a driving assembly, a lithium battery, an auxiliary wheel assembly and a control panel. The outer side of the laser radar is fixedly connected to the left end of the main body, the lower end of the magnetic guide is fixedly connected to the inner bottom of the left end of the main body, two driving assemblies are provided, the lower ends of the two driving assemblies are connected to the inner bottom of the main body, the two driving assemblies are arranged in front and back mirror images, the lower end of the lithium battery is fixedly connected to the inner bottom of the right end of the main body, four auxiliary wheel assemblies are provided, the outer side of the auxiliary wheel assembly is connected to the inner side of the main body, and the four auxiliary wheel assemblies are arranged around the inner bottom of the main body. The lower end of the control panel is fixedly connected to the inner bottom of the left end of the main body, the lithium battery is electrically connected to the laser radar, the magnetic guide, the driving assembly and the control panel, the control panel is electrically connected to the laser radar, the magnetic guide and the driving assembly, and the laser radar and the magnetic guide are existing technologies.

[0011] Furthermore, the drive assembly includes a driving wheel, a driving wheel frame and a driving motor. The inner side of the driving wheel is rotatably connected to the outer side of the driving wheel frame, the lower end of the driving wheel frame is fixedly connected to the inner bottom of the main body, the inner side of the driving wheel frame is fixedly connected to the outer side of the driving motor, the lower end of the driving motor is fixedly connected to the inner bottom of the main body, the output end of the driving motor is fixedly connected to the inner side of the driving wheel, a through hole is provided at the bottom of the main body for the driving wheel to pass through, and the driving motor is electrically connected to the lithium battery and the control board.

[0012] Furthermore, the auxiliary wheel assembly includes an auxiliary wheel and an auxiliary wheel frame, the outer side of the auxiliary wheel is rotatably connected to the inner side of the auxiliary wheel frame, the outer side of the auxiliary wheel frame is fixedly connected to the inside of the main body, and a through hole for the auxiliary wheel to pass through is provided at the inner bottom of the main body, and the auxiliary wheel is electrically connected to the lithium battery and the control board.

[0013] Furthermore, the traction device includes a supporting assembly, a buffer assembly, a connecting assembly and a locking assembly, the lower end of the supporting assembly is connected to the inner bottom of the main body, the right end of the supporting assembly is connected to the left end of the buffer assembly, the right end of the buffer assembly is connected to the left upper end of the connecting assembly, and the right upper end of the connecting assembly is connected to the lower end of the locking assembly.

[0014] Furthermore, the support assembly includes a fixed column and a rotating shaft, the lower end of the fixed column is fixedly connected to the inner bottom of the main body, the upper end of the fixed column is rotatably connected to the left end of the rotating shaft, and the right end of the rotating shaft is connected to the left end of the buffer assembly.

[0015] Furthermore, the buffer assembly includes a buffer shell, a buffer hook and a first spring. The inner side of the left end of the buffer shell is slidably connected to the outer side of the right end of the rotating shaft. Two buffer hooks and first springs are provided. The left end of the left buffer hook is fixedly connected to the right end of the rotating shaft, and the right end of the right buffer hook is fixedly connected to the left end of the buffer shell. One end of the two buffer hooks is tightly fitted and connected, the left end of the left first spring is fixedly connected to the right end of the rotating shaft, the right end of the left first spring is fixedly connected to the left end of the right buffer hook, the right end of the right first spring is fixedly connected to the left end of the buffer shell, the left end of the right first spring is fixedly connected to the right end of the left buffer hook, and the right end of the buffer shell is connected to the upper end of the connecting assembly.

[0016] Furthermore, the connecting assembly includes a connecting column and a base plate, the upper end of the connecting column is fixedly connected to the right end of the buffer shell, the lower end of the connecting column is fixedly connected to the left end of the base plate, and the right end of the base plate is connected to the lower end of the locking assembly.

[0017] Furthermore, the locking assembly includes a fixed frame, a compression frame, a sliding column, a second spring, a gear and a locking frame, the lower end of the fixed frame is fixedly connected to the upper end of the base plate, the inner side of the upper end of the fixed frame is slidably connected to the outer side of the upper end of the compression frame, the lower end of the compression frame is slidably connected to the upper end of the base plate, the upper end of the compression frame is provided with teeth, the left end of the sliding column is fixedly connected to the right end of the compression frame, the right end of the sliding column passes through the fixed frame and is slidably connected to the fixed frame, the second spring is sleeved on the outer side of the sliding column, the left end of the second spring is fixedly connected to the right end of the compression frame, the right end of the second spring is fixedly connected to the left end of the fixed frame, the outer side of the gear is rotatably connected to the inner side of the upper end of the fixed frame, the gear is meshed with the upper end of the compression frame, the outer side of the locking frame is slidably connected to the inner side of the upper end of the fixed frame, the lower end of the locking frame is provided with teeth, and the lower end of the locking frame is meshed with the gear.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model uses the laser radar to automatically stop when encountering an obstacle, which is stable and reliable, making the consignment process smooth and free of accidents. The magnetic guide is used to avoid deviation from the track.

[0020] The utility model pushes the compression frame during the traction process so that the locking frame locks the traction ring of the trailer to prevent it from falling off during the consignment process. The arrangement of the first spring avoids accidents caused by the inertia of the trailer when parking. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A three-dimensional diagram of a stable traction AGV trolley for consignment according to the utility model;

[0023] Figure 2 This is a front view of a traction-type AGV trolley with stable consignment according to the utility model;

[0024] Figure 3 A top view of a stable traction AGV trolley for consignment according to the utility model;

[0025] Figure 4 It is a three-dimensional diagram of the traction device of the utility model;

[0026] Figure 5 It is a front view of the traction device of the utility model;

[0027] Figure 6 It is a three-dimensional diagram of the auxiliary wheel assembly of the utility model;

[0028] Figure 7 For along Figure 2 AA direction cross-sectional view;

[0029] Figure 8 for Figure 4 The enlarged view of point B in the middle;

[0030] Fig. 9 For along Figure 5 CC direction cross-sectional view.

[0031] The numbers in the figure represent:

[0032] 1. Main body 2. Driving device 21. Laser radar 22. Magnetic guide 23. Driving assembly 231. Driving wheel 232. Driving wheel frame 233. Driving motor 24. Lithium battery 25. Auxiliary wheel assembly 251. Auxiliary wheel 252. Auxiliary wheel frame 26. Control board 3. Traction device 31. Support assembly 311. Fixed column 312. Rotating shaft 32. Buffer assembly 321. Buffer shell 322. Buffer hook 323. First spring 33. Connecting assembly 331. Connecting column 332. Bottom plate 34. Locking assembly 341. Fixed frame 342. Compression frame 343. Sliding column 344. Second spring 345. Gear 346. Locking frame. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0035] Embodiment 1

[0036] In some embodiments, please refer to the attached instructions. Figure 1-9 A traction-type AGV trolley with stable consignment includes a main body 1,

[0037] A driving device 2 is installed inside the main body 1, and one end of a traction device 3 is connected to the inside of the main body 1;

[0038] The driving device 2 includes a laser radar 21, a magnetic guide 22, a driving assembly 23, a lithium battery 24, an auxiliary wheel assembly 25 and a control board 26. The outer side of the laser radar 21 is fixedly connected to the left end of the main body 1, the lower end of the magnetic guide 22 is fixedly connected to the inner bottom of the left end of the main body 1, two driving assemblies 23 are provided, the lower ends of the two driving assemblies 23 are connected to the inner bottom of the main body 1, and the two driving assemblies 23 are arranged in front and back mirror images. The lower end of the lithium battery 24 is fixedly connected to the inner bottom of the right end of the main body 1. There are four auxiliary wheel assemblies 25, the outer side of the auxiliary wheel assembly 25 is connected to the inner side of the main body 1, and the four auxiliary wheel assemblies 25 are arranged around the inner bottom of the main body 1. The lower end of the control board 26 is fixedly connected to the inner bottom of the left end of the main body 1, the lithium battery 24 is electrically connected to the laser radar 21, the magnetic guide 22, the driving assembly 23 and the control board 26, the control board 26 is electrically connected to the laser radar 21, the magnetic guide 22 and the driving assembly 23, and the laser radar 21 and the magnetic guide 22 are prior art.

[0039] The driving assembly 23 includes a driving wheel 231, a driving wheel frame 232 and a driving motor 233. The inner side of the driving wheel 231 is rotatably connected to the outer side of the driving wheel frame 232, the lower end of the driving wheel frame 232 is fixedly connected to the inner bottom of the main body 1, the inner side of the driving wheel frame 232 is fixedly connected to the outer side of the driving motor 233, the lower end of the driving motor 233 is fixedly connected to the inner bottom of the main body 1, the output end of the driving motor 233 is fixedly connected to the inner side of the driving wheel 231, a through hole is provided at the bottom of the main body 1 for the driving wheel 231 to pass through, and the driving motor 233 is electrically connected to the lithium battery 24 and the control board 26.

[0040] The auxiliary wheel assembly 25 includes an auxiliary wheel 251 and an auxiliary wheel frame 252. The outer side of the auxiliary wheel 251 is rotatably connected to the inner side of the auxiliary wheel frame 252. The outer side of the auxiliary wheel frame 252 is fixedly connected to the inside of the main body 1. A through hole is provided at the inner bottom of the main body 1 for the auxiliary wheel 251 to pass through. The auxiliary wheel 251 is electrically connected to the lithium battery 24 and the control board 26.

[0041] When the stable traction AGV trolley is operating normally, the drive motor 233 is started, the drive motor 233 drives the drive wheel 231 to rotate, the drive wheel 231 drives the main body 1 to move, and the movement of the main body 1 drives the auxiliary wheel 251 to rotate. The auxiliary wheel 251 supports the weight of the equipment and reduces the load on the drive wheel 231. The lithium battery 24 provides energy to the laser radar 21, the magnetic guide 22, the drive wheel 231 and the control board 26. When the laser radar 21 detects an obstacle, the control board 26 controls the drive wheel 231 to stop running. When the magnetic guide 22 detects that the magnetic stripe track is not in the middle of the lower end of the main body 1, the control board 26 controls the two drive wheels 231 to adjust the speed to keep the main body 1 on the magnetic stripe track.

[0042] The traction device 3 includes a supporting component 31, a buffer component 32, a connecting component 33 and a locking component 34. The lower end of the supporting component 31 is connected to the inner bottom of the main body 1, the right end of the supporting component 31 is connected to the left end of the buffer component 32, the right end of the buffer component 32 is connected to the left upper end of the connecting component 33, and the right upper end of the connecting component 33 is connected to the lower end of the locking component 34.

[0043] The support assembly 31 includes a fixed column 311 and a rotating shaft 312. The lower end of the fixed column 311 is fixedly connected to the inner bottom of the main body 1, the upper end of the fixed column 311 is rotatably connected to the left end of the rotating shaft 312, and the right end of the rotating shaft 312 is connected to the left end of the buffer assembly 32.

[0044] The buffer assembly 32 includes a buffer shell 321, a buffer hook 322 and a first spring 323. The inner side of the left end of the buffer shell 321 is slidably connected to the outer side of the right end of the rotating shaft 312. Two buffer hooks 322 and first springs 323 are provided. The left end of the left buffer hook 322 is fixedly connected to the right end of the rotating shaft 312, and the right end of the right buffer hook 322 is fixedly connected to the left end of the buffer shell 321. One end of the two buffer hooks 322 is tightly fitted and connected. The left end of the left first spring 323 is fixedly connected to the right end of the rotating shaft 312, the right end of the left first spring 323 is fixedly connected to the left end of the right buffer hook 322, the right end of the right first spring 323 is fixedly connected to the left end of the buffer shell 321, the left end of the right first spring 323 is fixedly connected to the right end of the left buffer hook 322, and the right end of the buffer shell 321 is connected to the upper end of the connecting assembly 33.

[0045] The connecting assembly 33 includes a connecting column 331 and a bottom plate 332 . The upper end of the connecting column 331 is fixedly connected to the right end of the buffer shell 321 , the lower end of the connecting column 331 is fixedly connected to the left end of the bottom plate 332 , and the right end of the bottom plate 332 is connected to the lower end of the locking assembly 34 .

[0046] The locking assembly 34 includes a fixing frame 341, a compression frame 342, a sliding column 343, a second spring 344, a gear 345 and a locking frame 346. The lower end of the fixing frame 341 is fixedly connected to the upper end of the bottom plate 332, the inner side of the upper end of the fixing frame 341 is slidably connected to the outer side of the upper end of the compression frame 342, the lower end of the compression frame 342 is slidably connected to the upper end of the bottom plate 332, the upper end of the compression frame 342 is provided with teeth, the left end of the sliding column 343 is fixedly connected to the right end of the compression frame 342, and the right end of the sliding column 343 passes through the fixing frame 341 and the fixing frame 341 is slidably connected, the second spring 344 is sleeved on the outside of the sliding column 343, the left end of the second spring 344 is fixedly connected to the right end of the compression frame 342, the right end of the second spring 344 is fixedly connected to the left end of the fixing frame 341, the outer side of the gear 345 is rotatably connected to the inner side of the upper end of the fixing frame 341, the gear 345 is meshingly connected to the upper end of the compression frame 342, the outer side of the locking frame 346 is slidably connected to the inner side of the upper end of the fixing frame 341, the lower end of the locking frame 346 is provided with teeth, and the lower end of the locking frame 346 is meshingly connected to the gear 345.

[0047] When the stable traction AGV trolley is operating normally, the traction ring on the trailer is inserted from the left side of the compression frame 342. When the driving motor 233 drives the main body 1 to move to the left, the traction ring on the trailer pushes the compression frame 342 to the right. The compression frame 342 compresses the second spring 344, and the compression frame 342 drives the sliding column 343 to move to the right. The upper end of the compression frame 342 is engaged with the gear 345 to drive the gear 345 to rotate. The gear 345 drives the locking frame 346 to slide to the left along the fixed frame 341, and the traction ring is locked under the locking frame 346 to prevent the traction ring from being Disengagement, when the main body 1 brakes or stops moving due to an obstacle, the trailer will continue to move due to inertia, and the traction ring of the trailer hits the connecting column 331 to the left, and the connecting column 331 moves to the left, and the connecting column 331 drives the buffer shell 321 to move to the left, and the buffer shell 321 compresses the right first spring 323, and the buffer shell 321 drives the right buffer hook 322 to move to the left, and the buffer hook 322 compresses the left first spring 323. Under the buffering effect of the two first springs 323, the inertial impact of the trailer has little effect on the main body 1, and the stability of the goods in the trailer is also guaranteed.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A traction-type AGV trolley with stable consignment, comprising a main body (1), characterized in that: A driving device (2) is installed inside the main body (1), and one end of the traction device (3) is connected to the inside of the main body (1); The driving device (2) comprises a laser radar (21), a magnetic guide (22), a driving assembly (23), a lithium battery (24), an auxiliary wheel assembly (25) and a control panel (26); the outer side of the laser radar (21) is fixedly connected to the left end of the main body (1); the lower end of the magnetic guide (22) is fixedly connected to the inner bottom of the left end of the main body (1); two driving assemblies (23) are provided; the lower ends of the two driving assemblies (23) are connected to the inner bottom of the main body (1); the two driving assemblies (23) are arranged in front and back mirror images; the lower end of the lithium battery (24) is connected to the main body (1); ), four auxiliary wheel assemblies (25) are provided, the outer side of the auxiliary wheel assemblies (25) are connected to the inner side of the main body (1), and the four auxiliary wheel assemblies (25) are arranged around the inner bottom of the main body (1); the lower end of the control board (26) is fixedly connected to the inner bottom of the left end of the main body (1); the lithium battery (24) is electrically connected to the laser radar (21), the magnetic guide (22), the drive assembly (23) and the control board (26); and the control board (26) is electrically connected to the laser radar (21), the magnetic guide (22) and the drive assembly (23).

2. The stable traction AGV trolley according to claim 1 is characterized in that: The driving assembly (23) comprises a driving wheel (231), a driving wheel frame (232) and a driving motor (233); the inner side of the driving wheel (231) is rotatably connected to the outer side of the driving wheel frame (232); the lower end of the driving wheel frame (232) is fixedly connected to the inner bottom of the main body (1); the inner side of the driving wheel frame (232) is fixedly connected to the outer side of the driving motor (233); the lower end of the driving motor (233) is fixedly connected to the inner bottom of the main body (1); the output end of the driving motor (233) is fixedly connected to the inner side of the driving wheel (231); a through hole for the driving wheel (231) to pass through is provided at the bottom of the main body (1); and the driving motor (233) is electrically connected to the lithium battery (24) and the control board (26).

3. The stable traction AGV according to claim 2 is characterized in that: The auxiliary wheel assembly (25) comprises an auxiliary wheel (251) and an auxiliary wheel frame (252); the outer side of the auxiliary wheel (251) is rotatably connected to the inner side of the auxiliary wheel frame (252); the outer side of the auxiliary wheel frame (252) is fixedly connected to the inside of the main body (1); a through hole for the auxiliary wheel (251) to pass through is provided at the inner bottom of the main body (1); and the auxiliary wheel (251) is electrically connected to the lithium battery (24) and the control panel (26).

4. The stable traction AGV according to claim 3 is characterized in that: The traction device (3) comprises a support component (31), a buffer component (32), a connection component (33) and a locking component (34); the lower end of the support component (31) is connected to the inner bottom of the main body (1); the right end of the support component (31) is connected to the left end of the buffer component (32); the right end of the buffer component (32) is connected to the left upper end of the connection component (33); and the right upper end of the connection component (33) is connected to the lower end of the locking component (34).

5. The stable traction AGV according to claim 4 is characterized in that: The support assembly (31) comprises a fixed column (311) and a rotating shaft (312); the lower end of the fixed column (311) is fixedly connected to the inner bottom of the main body (1); the upper end of the fixed column (311) is rotatably connected to the left end of the rotating shaft (312); and the right end of the rotating shaft (312) is connected to the left end of the buffer assembly (32).

6. The stable traction AGV according to claim 5 is characterized in that: The buffer assembly (32) comprises a buffer shell (321), a buffer hook (322) and a first spring (323); the inner side of the left end of the buffer shell (321) is slidably connected to the outer side of the right end of the rotating shaft (312); two buffer hooks (322) and two first springs (323) are provided; the left end of the left buffer hook (322) is fixedly connected to the right end of the rotating shaft (312); the right end of the right buffer hook (322) is fixedly connected to the left end of the buffer shell (321); the two buffer hooks (322) are fixedly connected to the left end of the buffer shell (321); ), the left end of the left first spring (323) is fixedly connected to the right end of the rotating shaft (312), the right end of the left first spring (323) is fixedly connected to the left end of the right buffer hook (322), the right end of the right first spring (323) is fixedly connected to the left end of the buffer shell (321), the left end of the right first spring (323) is fixedly connected to the right end of the left buffer hook (322), and the right end of the buffer shell (321) is connected to the upper end of the connecting component (33).

7. The stable traction AGV according to claim 6 is characterized in that: The connecting assembly (33) comprises a connecting column (331) and a bottom plate (332), wherein the upper end of the connecting column (331) is fixedly connected to the right end of the buffer shell (321), the lower end of the connecting column (331) is fixedly connected to the left end of the bottom plate (332), and the right end of the bottom plate (332) is connected to the lower end of the locking assembly (34).

8. The stable traction AGV according to claim 7 is characterized in that: The locking assembly (34) comprises a fixing frame (341), a compression frame (342), a sliding column (343), a second spring (344), a gear (345) and a locking frame (346); the lower end of the fixing frame (341) is fixedly connected to the upper end of the bottom plate (332); the inner side of the upper end of the fixing frame (341) is slidably connected to the outer side of the upper end of the compression frame (342); the lower end of the compression frame (342) is slidably connected to the upper end of the bottom plate (332); the upper end of the compression frame (342) is provided with teeth; the left end of the sliding column (343) is fixedly connected to the right end of the compression frame (342); the right end of the sliding column (343) passes through the fixing frame (341) and the fixing frame (346); The fixed frame (341) is slidably connected, the second spring (344) is sleeved on the outer side of the sliding column (343), the left end of the second spring (344) is fixedly connected to the right end of the compression frame (342), the right end of the second spring (344) is fixedly connected to the left end of the fixed frame (341), the outer side of the gear (345) is rotatably connected to the inner side of the upper end of the fixed frame (341), the gear (345) is meshingly connected to the upper end of the compression frame (342), the outer side of the locking frame (346) is slidably connected to the inner side of the upper end of the fixed frame (341), the lower end of the locking frame (346) is provided with teeth, and the lower end of the locking frame (346) is meshingly connected to the gear (345).

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