CN209701625U - A carrier return line - Google Patents

Abstract

The utility model provides a carrier return line, which comprises a belt conveying mechanism, wherein one end of the belt conveying mechanism is provided with a starting point lifting mechanism, the other end of the belt conveying mechanism is provided with a terminal point lifting mechanism, and the belt conveying mechanism is also provided with a cleaning mechanism; the starting point lifting mechanism comprises a first rack, a first conveying assembly arranged on the first rack and a first lifting assembly arranged on the first rack, wherein a second conveying assembly is arranged on the first lifting assembly, and the first conveying assembly is positioned below the belt conveying mechanism; the terminal lifting mechanism comprises a second rack, a second lifting assembly arranged on the second rack and a first conveying mechanism arranged on the second lifting assembly; and the carriers are conveyed to the belt conveying mechanism through the starting point lifting mechanism, and the carriers are conveyed to other stations by the end point lifting mechanism after being cleaned by the cleaning mechanism through the belt conveying mechanism.

Description

A carrier return line

technical field

The utility model relates to the technical field of transportation, in particular to a carrier return line.

Background technique

Carrier, as a carrier, is used to place various products or products to be processed, especially when processing PCB boards, various placement carriers are required to facilitate the storage, transfer or processing of PCB boards.

Because of the use of the vehicle, it involves the problem of its handling and transportation. The traditional transportation method of the vehicle is generally carried by hand, the labor cost is high, and the efficiency is low. Although some are transported by machines, they are generally shorter. Pipeline, because a long pipeline will take up a lot of space, and the space cannot be used effectively.

Therefore, it is really necessary to provide a carrier return line, which can replace manual handling, reduce labor costs, improve efficiency, save space and make reasonable and effective use of space while maintaining a long assembly line.

Utility model content

In order to overcome the deficiencies of the prior art, the utility model provides a carrier return line, which can replace manual handling, reduce labor costs, and improve efficiency. Above, the transfer of each station is carried out through the lifting platform, which saves space and makes reasonable and effective use of the space below.

The technical solution adopted by the utility model is a carrier return line, which includes a belt conveying mechanism. One end of the belt conveying mechanism is provided with a starting point lifting mechanism, and the other end is provided with an end point lifting mechanism. The belt conveying mechanism is close to the One end of the terminal lifting mechanism is also provided with a cleaning mechanism; the starting point lifting mechanism includes a first frame, a first conveying assembly mounted on the first frame, and a first conveyor assembly mounted on the first frame. A lifting assembly, the first lifting assembly is provided with a second conveying assembly, the first conveying assembly is located below the belt conveying mechanism; the terminal lifting mechanism includes a second frame, located on the second The second lifting assembly on the frame, and the first conveying mechanism located on the second lifting assembly; the carrier is transported to the belt conveying mechanism through the starting point lifting mechanism, and the belt conveying mechanism will After the carrier is transported to the cleaning mechanism for cleaning, the terminal lifting mechanism transports the carrier to other stations.

Further, the first lifting assembly and the second lifting assembly have the same structure, including a lifting platform, a guide column, a guide sleeve, a driven sprocket, a driving sprocket, a chain, a driving shaft, a driven shaft, and a first bearing seat and a second bearing seat, the guide sleeve is arranged on the lifting platform, the guide post passes through the guide sleeve, the drive shaft is rotatably mounted on the first bearing seat, and the drive sprocket Set on the driving shaft, the driven shaft is rotatably mounted on the second bearing seat, the driven sprocket is set on the driven shaft, the driven sprocket and the driving chain The wheels are set up and down, and the chain is wound around the driving sprocket and the driven sprocket to form a waist-shaped closed-loop structure. One side of the chain is fixedly connected with the lifting platform, and a first drive The device drives the driving shaft to rotate, drives the chain transmission, and thus drives the lifting platform to go up and down.

Further, the first conveying mechanism includes a third conveying assembly arranged on the lifting platform, a fourth conveying assembly arranged in the middle of the third conveying assembly, and a top conveying assembly arranged below the fourth conveying assembly. lifting assembly, the conveying direction of the third conveying assembly and the conveying direction of the fourth conveying assembly are perpendicular to each other.

Further, the third conveying assembly includes a first side plate and a second side plate arranged on opposite sides of the lifting platform, one end of a first rotating shaft is rotatably connected to the first side plate, and the other end is connected to the first side plate. The second side plate is rotatably connected and passed through the second side plate, and the other end is connected with a second driving device, and the second driving device drives the first rotating shaft to rotate; the first side plate A first belt conveying assembly is provided, and the first belt conveying assembly includes a first pulley, a second pulley and a first tensioning pulley rotatably mounted on the first side plate, the first pulley and The central axis of the second pulley is on the same horizontal plane, and a first belt is wound around the first pulley, the second pulley and the first tensioning pulley to form a closed-loop structure, so A third pulley is provided on the end of the first rotating shaft close to the first side plate, and the rim of the third pulley is in conflict with the first belt for tension; the second side plate is provided with the The first belt conveying assembly is symmetrical to the second belt conveying assembly, the second belt conveying assembly has the same structure as the first belt conveying assembly; the fourth conveying assembly is arranged between the first belt conveying assembly and the Between the second belt conveyor assembly.

Further, the jacking assembly includes a first linear bearing arranged on the lifting platform, a guide shaft passing through the first linear bearing, and one end of the guide shaft is fixed to the fourth conveying assembly connected, the lifting platform is further provided with a first air cylinder, and the piston rod of the first air cylinder is fixedly connected with the fourth conveying assembly.

Further, the first conveying assembly, the second conveying assembly and the fourth conveying assembly have the same structure, including a first fixing plate, a third side plate set on the first fixing plate, and a third side plate set on the first fixing plate. Two guide rails on the first fixed plate and two sliders that slide along the guide rails respectively, the direction of the guide rails is perpendicular to the third side plate, and one end of a fourth side plate is fixed on one of the slides block, the other end of which is fixed on the other slider; one end of a second shaft is rotatably connected to the fourth side plate, and the other end is rotatably connected to the third side plate and passes through the first Three side plates, the other end is connected with a third driving device, and the third driving device drives the second rotating shaft to rotate; the third side plate is provided with a third belt conveying assembly, and the third belt conveys The assembly includes a fourth pulley, a fifth pulley and a second tensioning pulley rotatably mounted on the fourth side plate, the central axis of the fourth pulley and the fifth pulley are on the same horizontal plane, A second belt is wound around the fourth pulley, the fifth pulley and the second tensioning pulley to form a closed-loop structure, and the end of the second rotating shaft close to the fourth side plate is arranged There is a second linear bearing, and the second linear bearing is tightened with a sixth pulley, and the rim of the sixth pulley is in conflict with the second belt for tension; the third side plate is provided with a The third belt conveying assembly is symmetrical to the fourth belt conveying assembly, and the structure of the fourth belt conveying assembly is the same as that of the third belt conveying assembly; a width adjustment assembly is also arranged on the third side plate.

Further, the width adjustment assembly includes a screw nut fixed on the fourth side plate, and a screw rod rotatably mounted on the third side plate, one end of the screw rod passes through the first The three side plates are provided with a width-adjusting handle, and the other end of the screw rod is threadedly connected with the screw nut.

Further, guide plates are provided on the third side plate and the fourth side plate.

Further, on the first fixing plate in the first conveying assembly, there is an upwardly arranged blocking cylinder, the blocking cylinder is arranged close to the second conveying assembly, and the blocking cylinder is arranged on between the third belt conveyor assembly and the fourth belt conveyor assembly.

Further, the cleaning mechanism includes a fixed frame arranged on the belt conveying mechanism, a brush connected to the fixed frame in rotation, a third driving device for driving the brush to rotate, and a Vacuum cleaner above the conveyor mechanism.

The beneficial effects of the utility model are as follows: the utility model firstly places the carrier on the first conveying assembly, and after the first lifting assembly lowers the second conveying assembly to communicate with the first conveying assembly, the carrier moves from the The first conveying assembly is transported to the second conveying assembly, and then, the first lifting assembly lifts the second conveying assembly to communicate with the upper belt conveying mechanism, and the second conveying assembly conveys the carrier to the belt conveying mechanism, and then, the belt conveying mechanism conveys the carrier to the cleaning mechanism for cleaning, at this time, the second lifting assembly lifts the first conveying mechanism The conveying mechanism is connected, and then the belt conveying mechanism conveys the cleaned carrier to the first conveying mechanism, and after it is lowered by the second lifting assembly, the first conveying mechanism conveys the carrier on it. Carriers to other stations, thus realizing the whole process of transporting the carriers from the bottom to the top after cleaning, and then transporting them from the top to the bottom. Through this structure, the traditional manual conveying is replaced, and at the same time, because the belt conveying mechanism is arranged above, the space below can be used reasonably and effectively.

Description of drawings:

Fig. 1 is the overall structure schematic diagram of the carrier return line described in the utility model;

Fig. 2 is a structural schematic diagram of the starting point lifting mechanism of the carrier return line described in the present invention;

Fig. 3 is a structural schematic diagram of the terminal lifting mechanism of the carrier return line described in the present invention;

Fig. 4 is a structural schematic diagram of the lifting assembly of the carrier return line described in the present invention;

Fig. 5 is the enlarged view of place A in Fig. 4;

Fig. 6 is a schematic structural view of the first conveying mechanism of the carrier return line according to the present invention;

Fig. 7 is a structural schematic diagram of the jacking assembly of the carrier return line described in the present invention;

Fig. 8 is a structural schematic diagram of the conveying assembly of the carrier return line described in the present invention;

FIG. 9 is a structural schematic diagram of the cleaning mechanism of the carrier return line according to the present invention.

Explanation of reference signs:

Belt conveying mechanism 100, starting point lifting mechanism 200, first frame 201, first conveying assembly 210, first fixing plate 211, third side plate 212, guide rail 213, slider 214, fourth side plate 215, second rotating shaft 216, guide plate 217, material blocking cylinder 218, first lifting assembly 220, lifting platform 221, driven sprocket 222, driving sprocket 223, chain 224, driving shaft 225, driven shaft 226, first bearing seat 227, The second bearing seat 228, the second conveying assembly 230, the first driving device 240, the third driving device 250, the third belt conveying assembly 260, the fourth pulley 261, the fifth pulley 262, the second tensioning pulley 263, The second belt 264, the sixth pulley 265, the fourth belt conveying assembly 270, the width adjustment assembly 280, the screw nut 281, the screw mandrel 282, the width adjustment handle 283, the terminal lifting mechanism 300, the second frame 301, the second The lifting assembly 310, the cleaning mechanism 400, the fixed frame 401, the brush 402, the vacuum cleaner 403, the fourth driving device 410, the first conveying mechanism 500, the third conveying assembly 510, the first side plate 511, the second side plate 512, the second A rotating shaft 513, a fourth conveying assembly 520, a jacking assembly 530, a first linear bearing 531, a guide shaft 532, a first cylinder 533, a second driving device 540, a first motor 541, a driving pulley 542, and a driven belt Pulley 543, transmission belt 544, first belt conveying assembly 550, first pulley 551, second pulley 552, first tensioning pulley 553, first belt 554, third pulley 555, second belt conveying assembly 560.

Detailed ways

In order to make the utility model purpose, technical scheme and technical effect of the utility model clearer, the utility model will be further described below in combination with specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, not to limit the utility model.

Referring to Figures 1-3, a carrier return line includes a belt conveying mechanism 100, one end of the belt conveying mechanism 100 is provided with a starting point lifting mechanism 200, and the other end is provided with a terminal lifting mechanism 300, and the belt conveying mechanism A cleaning mechanism 400 is also provided at the end of 100 close to the terminal lifting mechanism 300 . Wherein, the belt conveying mechanism 100 is a conventional belt conveying device, and the workpiece is conveyed by placing the workpiece on the belt, so its specific structure and working principle will not be repeated in this utility model. The starting point lifting mechanism 200 includes a first frame 201, a first conveying assembly 210 disposed on the first frame 201, and a first lifting assembly 220 disposed on the first frame 201, the The first lifting assembly 220 is provided with a second conveying assembly 230, and the first conveying assembly 210 is located below the belt conveying mechanism 100 (that is, the belt conveying mechanism 100 is mounted on a high place). The terminal lifting mechanism 300 includes a second frame 301 , a second lifting assembly 310 mounted on the second frame 301 , and a first conveying mechanism 500 mounted on the second lifting assembly 310 . The carrier is transported to the belt conveying mechanism 100 by the starting point lifting mechanism 200, and after the belt conveying mechanism 100 transports the carrier to the cleaning mechanism 400 for cleaning, the terminal lifting mechanism 300 will The carrier is lowered and transported to other stations. In this embodiment, after the first lifting assembly 220 lowers the second conveying assembly 230 to communicate with the first conveying assembly 210 , the carrier is conveyed from the first conveying assembly 210 to the second conveying assembly 230 . On the conveying assembly 230, then, the first lifting assembly 220 lifts the second conveying assembly 230 to communicate with the belt conveying mechanism 100, and the second conveying assembly 230 conveys the carrier to the belt On the conveying mechanism 100, next, the belt conveying mechanism 100 conveys the carrier to the cleaning mechanism 400 for cleaning, at this time, the second lifting assembly 310 lifts the first conveying mechanism 500 to It communicates with the belt conveying mechanism 100, and then the belt conveying mechanism 100 conveys the cleaned carrier to the first conveying mechanism 500, and after it is lowered by the second lifting assembly 310, the The first transport mechanism 500 transports the carrier on it to other stations, thereby realizing the whole process of transporting the carrier from the bottom to the top after cleaning, and then transporting from the top to the bottom.

4 and 5, the first lifting assembly 220 and the second lifting assembly 310 have the same structure, including a lifting table 221, a guide post 2211, a guide sleeve 2212, a driven sprocket 222, and a driving sprocket 223, a chain 224, a driving shaft 225, a driven shaft 226, a first bearing seat 227 and a second bearing seat 228, the guide sleeve 2212 is arranged on the lifting table 221, and the guide post 2211 passes through the guide sleeve 2212, the driving shaft 225 is rotatably mounted on the first bearing seat 227, the driving sprocket 223 is arranged on the driving shaft 225, and the driven shaft 226 is rotatably mounted on the second bearing seat 228, the driven sprocket 222 is set on the driven shaft 226, the driven sprocket 222 and the driving sprocket 223 are arranged one above the other, and the chain 224 is wound around the driving chain On the wheel 223 and the driven sprocket 222, a waist-shaped closed-loop structure is formed, one side of the chain 224 is fixedly connected with the lifting table 221, and a first driving device 240 drives the driving shaft 225 to rotate, driving the The chain 224 is driven to drive the lifting platform 221 to go up and down. Wherein, the guide column 2211, the first bearing seat 227 and the second bearing seat 228 in the first lifting assembly 220 are fixed on the first frame 201, and the second lifting assembly 310 The guide post 2211 , the first bearing seat 227 and the second bearing seat 228 are fixed on the second frame 301 . Wherein, the first driving device 240 is driven by a motor, and the motor shaft of the driving motor (not shown in the figure) can be directly connected to one end of the driving shaft 225 with a coupling, or it can be driven by a coupling between the two. Transmission mechanism is set, for example can be belt transmission, also can be conventional transmission modes such as chain transmission, so its specific structure and principle are not repeated in the utility model.

Specifically, referring to FIG. 6 , the first conveying mechanism 500 includes a third conveying assembly 510 disposed on the lifting table 221 in the second lifting assembly 310 , and a third conveying assembly 510 disposed in the middle of the third conveying assembly 510 The fourth conveying assembly 520 , and the jacking assembly 530 disposed below the fourth conveying assembly 520 , the conveying direction of the third conveying assembly 510 and the conveying direction of the fourth conveying assembly 520 are perpendicular to each other. The fourth conveying assembly 520 is jacked up by the jacking assembly 530 . At the beginning, the jacking assembly 530 jacks up the fourth conveying assembly 520, and after the carrier is conveyed from the belt conveyor mechanism 100 to the fourth conveying assembly 520, the jacking assembly 530 lifts the The fourth conveying assembly 520 descends and makes its height lower than that of the third conveying assembly 510. At this time, the carrier is carried on the third conveying assembly 510, and then the third conveying assembly 510 transports the carrier Convey to other stations. Specifically, referring to FIG. 7 , the jacking assembly 530 includes a first linear bearing 531 provided on the lifting table 221 in the second lifting assembly 310 , and the first linear bearing 531 passes through the first linear bearing 531 A guide shaft 532, one end of the guide shaft 532 is fixedly connected with the fourth conveying assembly 520, and a first cylinder 533 is also provided on the lifting table 221, and the piston rod of the first cylinder 533 is connected with the fourth conveying assembly 520. The delivery assembly 520 is fixedly connected. The fourth conveying assembly 520 is pushed up and down by the first air cylinder 533 .

Specifically, referring to FIG. 6 , the third conveying assembly 510 includes a first side plate 511 and a second side plate 512 arranged on opposite sides of the lifting table 221 in the second lifting assembly 310 , a first One end of the rotating shaft 513 is rotatably connected to the first side plate 511, the other end is rotatably connected to the second side plate 512 and passes through the second side plate 512, and the other end is connected to a second driving device 540 , the second driving device 540 drives the first rotating shaft 513 to rotate. The first side plate 511 is provided with a first belt conveying assembly 550, and the first belt conveying assembly 550 includes a first pulley 551, a second pulley 552 and The first tensioning pulley 553, the central axes of the first pulley 551 and the second pulley 552 are on the same horizontal plane, and a first belt 554 is wound around the first pulley 551 and the second pulley 551. A closed-loop structure is formed on the pulley 552 and the first tension pulley 553, and a third pulley 555 is provided on the end of the first rotating shaft 513 close to the first side plate 511, and the third pulley 555 The rim of the wheel is in conflict with the first belt 554 for tension; the second side plate 512 is provided with a second belt conveyor assembly 560 symmetrical to the first belt conveyor assembly 550, and the second belt conveyor assembly 560 It has the same structure as the first belt conveyor assembly 550 . When the carrier is conveyed from the belt conveying mechanism 100, it is carried by the first belt conveying assembly 550 and the second belt conveying assembly 560, and passes through the first belt conveying assembly 550 and the second belt conveying assembly. Belt conveyor assembly 560 delivers. Specifically, the fourth conveying assembly 520 is disposed between the first belt conveying assembly 550 and the second belt conveying assembly 560 .

Specifically, referring to FIG. 8 , the first conveying assembly 210 , the second conveying assembly 230 and the fourth conveying assembly 520 have the same structure, including a first fixing plate 211 disposed on the first fixing plate 211 The third side plate 212, and two guide rails 213 on the first fixed plate 211 and two sliders 214 respectively sliding along the guide rails 213, the direction of the guide rail 213 is set in the same direction as the third side plate 212 is vertical, one end of a fourth side plate 215 is fixed on one of the sliders 214 , and the other end is fixed on the other slider 214 . One end of a second rotating shaft 216 is rotatably connected with the fourth side plate 215, the other end is rotatably connected with the third side plate 212 and passes through the third side plate 212, and the other end is connected with a third drive The device 250 is connected, and the third driving device 250 drives the second rotating shaft 216 to rotate. The third side plate 212 is provided with a third belt conveying assembly 260, and the third belt conveying assembly 260 includes a fourth pulley 261, a fifth pulley 262 and The second tensioning pulley 263, the central axis of the fourth pulley 261 and the fifth pulley 262 are on the same horizontal plane, and a second belt 264 is wound around the fourth pulley 261 and the fifth pulley 261. A closed-loop structure is formed on the pulley 262 and the second tensioning pulley 263, and a second linear bearing (not marked in the figure) is provided on the end of the second rotating shaft 216 near the fourth side plate 215. The second linear bearing is tightened with a sixth pulley 265 , and the rim of the sixth pulley 265 is in conflict with the second belt 264 for tension. The second belt 264 can be set away from other parts through the second tensioning pulley 263 without causing interference. Specifically, the third side plate 212 is provided with a fourth belt conveying assembly 270 symmetrical to the third belt conveying assembly 260, and the fourth belt conveying assembly 270 has the same structure as the third belt conveying assembly 260. . The carrier is conveyed by the fourth belt conveying assembly 270 and the third belt conveying assembly 260 .

Preferably, the third side plate 212 is further provided with a width adjustment assembly 280 . The width adjustment assembly 280 includes a screw nut 281 fixed on the fourth side plate 215, and a screw rod 282 rotatably mounted on the third side plate 212, one end of the screw rod 282 passes through The third side plate 212 is also provided with a width-adjusting handle 283 , and the other end of the screw rod 282 is screwed to the screw nut 281 . By turning the width adjustment handle 283, the screw rod 282 is driven to rotate, so that the fourth side plate 215 slides along the guide rail 213, and then the third side plate 212 and the fourth side plate 215 are adjusted. width between. Because the second linear bearing is provided on the second rotating shaft 216 , the fourth side plate 215 can slide along the second rotating shaft 216 .

Preferably, guide plates 217 are provided on the third side plate 212 and the fourth side plate 215 . The carrier is guided by the guide plate 217 .

Preferably, referring to FIG. 8 , the first fixing plate 211 in the first conveying assembly 210 is provided with an upwardly disposed blocking cylinder 218 , and the blocking cylinder 218 is close to the second conveying assembly 230 set, and the blocking cylinder 218 is set between the third belt conveying assembly 260 and the fourth belt conveying assembly 270 . When the push rod of the material blocking cylinder 218 stretches out, it can play the role of blocking material.

Specifically, referring to FIG. 9 , the cleaning mechanism 400 includes a fixed frame 401 arranged on the belt conveying mechanism 100, a brush 402 connected to the fixed frame 401 in rotation, and a second motor that drives the brush 402 to rotate. Four driving devices 410 and a vacuum cleaner 403 arranged above the belt conveying mechanism 100 .

Please refer to FIG. 8 , in this embodiment, the second driving device 540, the third driving device 250 and the fourth driving device 410 have the same structure, including a first motor 541, a driving pulley 542, a driven The pulley 543 and the transmission belt 544, the driving pulley 542 is arranged on the motor shaft of the first motor 541, the driven pulley 543 is arranged on one end of the shaft to be driven, and the transmission belt 544 is wound around the On the driving pulley 542 and the driven pulley 543, a closed-loop structure is formed, and the shaft to be rotated is driven by the driving of the first motor 541. Of course, the driving pulley 542 and the driven pulley 543 and drive belt 544 can be changed into sprocket wheel and chain accordingly, and the utility model is not limited at this.

The working process of the utility model: the utility model lowers the second conveying component 230 to communicate with the first conveying component 210 through the first lifting component 220, and the carrier is transported from the first conveying component 210 to the second conveying assembly 230, and then, the first lifting assembly 220 lifts the second conveying assembly 230 to communicate with the belt conveying mechanism 100, and the second conveying assembly 230 lifts the carrier transported to the belt conveying mechanism 100, and then, the belt conveying mechanism 100 transports the carrier to the cleaning mechanism 400 for cleaning, at this time, the second lifting assembly 310 lifts the first The conveying mechanism 500 rises to communicate with the belt conveying mechanism 100, and then the belt conveying mechanism 100 conveys the cleaned carrier to the first conveying mechanism 500, and the second lifting assembly 310 lifts it After descending, the first conveying mechanism 500 transports the carrier on it to other stations, thereby realizing the whole process of transporting the carrier from the bottom to the top after cleaning, and then transporting from the top to the bottom. The utility model can replace the traditional manual handling, reduce labor costs, and improve efficiency. In the state of maintaining a long assembly line, by placing the belt conveying mechanism 100 on a high place, the first lifting assembly 220 and the The second lifting assembly 310 performs the transfer of each work station, which saves space and makes reasonable and effective use of the space below.

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, on the premise of not departing from the idea of the utility model, its structure form can be flexible and changeable, and a series of products can be derived. Just making some simple deductions or substitutions should be considered as belonging to the patent protection scope of the utility model determined by the submitted claims.

Claims (10)

1. A carrier return line, comprising a belt conveying mechanism (100), is characterized in that: one end of the belt conveying mechanism (100) is provided with a starting point lifting mechanism (200), and its other end is provided with a terminal lifting mechanism ( 300), the belt conveying mechanism (100) is also provided with a cleaning mechanism (400) near one end of the terminal lifting mechanism (300); the starting point lifting mechanism (200) includes a first frame (201), located at The first conveying assembly (210) on the first frame (201), and the first lifting assembly (220) arranged on the first frame (201), the first lifting assembly (220) The second conveying assembly (230) is arranged on it, and the first conveying assembly (210) is located below the belt conveying mechanism (100); the terminal lifting mechanism (300) includes a second frame (301), which is set The second lifting assembly (310) on the second frame (301), and the first conveying mechanism (500) arranged on the second lifting assembly (310); through the starting point lifting mechanism (200 ) transports the carrier to the belt conveying mechanism (100), and the belt conveying mechanism (100) transports the carrier to the cleaning mechanism (400) for cleaning, and then the terminal lifting mechanism (300) ) to transport the carrier to other stations. 2. The carrier return line according to claim 1, characterized in that: the first lifting assembly (220) and the second lifting assembly (310) have the same structure, including a lifting table (221), a guide post (2211), guide sleeve (2212), driven sprocket (222), driving sprocket (223), chain (224), driving shaft (225), driven shaft (226), first bearing housing (227) and the second bearing seat (228), the guide sleeve (2212) is arranged on the lifting platform (221), the guide post (2211) passes through the guide sleeve (2212), and the driving shaft (225 ) is rotatably installed on the first bearing seat (227), the driving sprocket (223) is arranged on the driving shaft (225), and the driven shaft (226) is rotatably installed on the second bearing On the seat (228), the driven sprocket (222) is arranged on the driven shaft (226), and the driven sprocket (222) and the driving sprocket (223) are arranged one above the other, The chain (224) is wound around the driving sprocket (223) and the driven sprocket (222) to form a waist-shaped closed-loop structure, and one side of the chain (224) is connected to the lifting platform ( 221) is fixedly connected, and a first driving device (240) drives the drive shaft (225) to rotate, and drives the chain (224) to drive, thereby driving the lifting platform (221) to go up and down. 3. The carrier return line according to claim 2, characterized in that: the first conveying mechanism (500) includes a third conveying assembly (510) arranged on the lifting platform (221), which is arranged on The fourth conveying assembly (520) in the middle of the third conveying assembly (510), and the jacking assembly (530) arranged below the fourth conveying assembly (520), the third conveying assembly (510) conveys The direction of is perpendicular to the conveying direction of the fourth conveying assembly (520). 4. The carrier return line according to claim 3, characterized in that: the third conveying assembly (510) comprises first side plates (511) and The second side plate (512), one end of a first rotating shaft (513) is rotatably connected with the first side plate (511), and the other end is rotatably connected with the second side plate (512) and passes through the The second side plate (512), the other end is connected with a second drive device (540), and the second drive device (540) drives the first rotating shaft (513) to rotate; the first side plate (511 ) is provided with a first belt conveying assembly (550), and the first belt conveying assembly (550) includes a first pulley (551) and a second pulley rotatably mounted on the first side plate (511). (552) and the first tensioning pulley (553), the central axes of the first pulley (551) and the second pulley (552) are on the same horizontal plane, and a first belt (554) is wound around A closed-loop structure is formed on the first pulley (551), the second pulley (552) and the first tension pulley (553), and the first rotating shaft (513) is close to the first One end of the side plate (511) is provided with a third pulley (555), and the rim of the third pulley (555) is in conflict with the first belt (554) for tension; the second side plate (512 ) is provided with a second belt conveying assembly (560) symmetrical to the first belt conveying assembly (550), and the second belt conveying assembly (560) has the same structure as the first belt conveying assembly (550); The fourth conveying assembly (520) is arranged between the first belt conveying assembly (550) and the second belt conveying assembly (560). 5. The carrier return line according to claim 4, characterized in that: the jacking assembly (530) includes a first linear bearing (531) arranged on the lifting platform (221), passing through The guide shaft (532) of the first linear bearing (531), one end of the guide shaft (532) is fixedly connected to the fourth conveying assembly (520), and the lifting platform (221) is also provided with The first air cylinder (533), the piston rod of the first air cylinder (533) is fixedly connected with the fourth conveying assembly (520). 6. The carrier return line according to claim 5, characterized in that: the first conveying assembly (210), the second conveying assembly (230) and the fourth conveying assembly (520) have the same structure , comprising a first fixed plate (211), a third side plate (212) arranged on the first fixed plate (211), and two guide rails (213) arranged on the first fixed plate (211) And two slide blocks (214) that slide along the guide rail (213) respectively, the direction that the guide rail (213) is set is perpendicular to the third side plate (212), and one end of the fourth side plate (215) is fixed On one said slider (214), the other end thereof is fixed on another said slider (214); one end of a second rotating shaft (216) is rotatably connected with said fourth side plate (215), and its The other end is rotatably connected with the third side plate (212) and passes through the third side plate (212), and the other end is connected with a third driving device (250), and the third driving device (250) Drive the second rotating shaft (216) to rotate; the third side plate (212) is provided with a third belt conveying assembly (260), and the third belt conveying assembly (260) includes a rotating assembly mounted on the fourth The fourth pulley (261), the fifth pulley (262) and the second tension pulley (263) on the side plate (215), the fourth pulley (261) and the fifth pulley (262) ) on the same horizontal plane, a second belt (264) is wound around the fourth pulley (261), the fifth pulley (262) and the second tension pulley (263) , forming a closed-loop structure, the end of the second shaft (216) close to the fourth side plate (215) is provided with a second linear bearing, and the second linear bearing is tightened with a sixth pulley (265) , the rim of the sixth pulley (265) is in conflict with the second belt (264) for tension; the third side plate (212) is provided with a The fourth belt conveying assembly (270), the fourth belt conveying assembly (270) has the same structure as the third belt conveying assembly (260); the third side plate (212) is also provided with a width adjustment assembly (280). 7. The carrier return line according to claim 6, characterized in that: the width adjustment assembly (280) includes a screw nut (281) fixed on the fourth side plate (215), and Rotate the screw rod (282) installed on the third side plate (212), one end of the screw rod (282) passes through the third side plate (212) and is provided with a width adjustment handle (283), The other end of the screw rod (282) is threadedly connected with the screw nut (281). 8. The carrier return line according to claim 7, characterized in that: the third side plate (212) and the fourth side plate (215) are both provided with guide plates (217). 9. The carrier return line according to claim 8, characterized in that: the first fixing plate (211) in the first conveying assembly (210) is provided with an upwardly arranged blocking cylinder ( 218), the blocking cylinder (218) is arranged close to the second conveying assembly (230), and the blocking cylinder (218) is arranged on the third belt conveying assembly (260) and the fourth belt Between conveying components (270). 10. The carrier return line according to claim 1, characterized in that: the cleaning mechanism (400) includes a fixed frame (401) arranged on the belt conveying mechanism (100), which is rotatably connected to the A brush (402) on the fixed frame (401), a fourth drive device (410) for driving the brush (402) to rotate, and a vacuum cleaner (403) arranged above the belt conveying mechanism (100).