CN113860007B - A robot for loading bagged goods into a van - Google Patents

Abstract

The invention belongs to the field of logistics automation equipment, and particularly relates to a loading robot for bagged goods of a van. The invention comprises a lifting assembly, a bearing assembly, a conveying assembly and a discharging assembly; the unloading assembly includes: the side frame, the conveyer belt driving assembly and the unloading carrier roller set; the conveyor belt drive assembly includes: the device comprises a first driving motor, a second driving motor, a first driving sprocket, a first driven sprocket, a first conveying roller, a second driving sprocket, a second driven sprocket, a second conveying roller, a first guide roller, a second guide roller, an uplink carrier roller set and a downlink carrier roller set; one end of the conveying belt is wound on the first conveying roller, and the other end sequentially clockwise bypasses the first guide roller, the uplink carrier roller group, the downlink carrier roller group and the second guide roller and then winds on the second conveying roller. According to the invention, goods can be stably piled into the carriage through the unloading assembly, automatic loading of the goods can be realized, manpower and material resources are saved, and the whole loading process can be ensured to be stable and efficient.

Description

A robot for loading bagged goods into a van

Technical Field

The invention belongs to the technical field of logistics automation equipment, and in particular relates to a robot for loading bagged goods into a van.

Background technique

With the development of economy, the volume of logistics transportation is increasing day by day. As an important means of transportation in logistics transportation, van trucks are characterized by a sun-proof and rain-proof compartment on the upper part of the frame. Van trucks have a good protective effect on goods when transporting goods. At the same time, their unique structural type brings great trouble to the loading and stacking of goods. Because van trucks have compartments, they cannot be loaded directly from the top of the car using equipment such as gantry cranes like open cars. Therefore, the loading of goods in existing van trucks still relies mainly on manpower, and a large amount of loading work is still mainly carried on the shoulders and backs of people. The labor intensity is high, the operation time is long, the loading efficiency is low, and the handling environment is poor. These are several prominent problems. When loading materials with certain corrosive properties such as cement and fertilizers, workers must take certain protective measures when handling, such as wearing masks and long-sleeved work clothes, etc., especially in hot summer, the work is very inconvenient, and manual handling is restricted by time and weather, and the operation efficiency is reduced. In addition, manual handling also has certain safety risks. If you are not careful, it is easy to cause personal injury accidents. Based on this, the applicant proposes a van bagged cargo loading robot that effectively improves cargo loading efficiency, increases the degree of automation of cargo loading, and has high safety.

Summary of the invention

The purpose of the present invention is to overcome the defects of manual loading, high labor intensity, long operation time, low efficiency and poor safety in the prior art, and to provide a van bagged cargo loading robot with high automation, high efficiency, high safety and the ability to transport goods over long distances.

The technical solution adopted by the present invention to solve its technical problem is:

A robot for loading bagged goods on a van, characterized in that it includes a lifting assembly, a bearing assembly fixedly connected to the lifting assembly, and a conveying assembly and an unloading assembly mounted on the bearing assembly; the unloading assembly includes: two side frames arranged opposite to each other on the left and right, at least one conveyor belt for transferring bagged goods, and a conveyor belt driving assembly for driving the conveyor belt; the front end of the side frame has a downwardly inclined unloading slope, and an unloading roller group mounted on the unloading slope; the conveyor belt driving assembly includes: a first driving motor and a second driving motor mounted on the conveying assembly, a first driving sprocket coaxially connected to the output shaft of the first driving motor, A first driven sprocket connected to the first driving sprocket chain transmission, a first conveying roller coaxially arranged with the first driven sprocket, a second driving sprocket coaxially connected to the output shaft of the second driving motor, a second driven sprocket connected to the second driving sprocket chain transmission, a second conveying roller coaxially arranged with the second driven sprocket, a first guide roller and a second guide roller installed at the rear end of the side frame, and an upward roller group and a downward roller group installed on the side frame; one end of the conveyor belt is wound around the first conveying roller, and the other end is wound around the first guide roller, the upward roller group, the downward roller group and the second guide roller in a clockwise manner and then wound around the second conveying roller.

Furthermore, the lifting assembly includes: an outer mast, an inner mast slidably connected to the outer mast, a sliding plate slidably connected to the inner mast, a plurality of lifting hydraulic cylinders vertically fixed to the bottom end of the outer mast, a sprocket plate coaxially fixedly connected to the telescopic end of the lifting hydraulic cylinder, a sprocket shaft fixedly connected to the sprocket plate, a sprocket rotatably connected to the sprocket shaft, and a third chain with one end fixed to the top cross beam of the outer mast, the other end of the third chain passes over the sprocket and is fixedly connected to the sliding plate; the sprocket plate is fixedly connected to the inner mast.

Furthermore, the outer door frame is fixed with an outer door frame longitudinal roller and an outer door frame lateral roller; the inner door frame is fixed with an inner door frame longitudinal roller and an inner door frame lateral roller; the upper and lower ends of the sliding plate are fixed with sliding plate longitudinal rollers and sliding plate lateral rollers; one side of the outer door frame longitudinal roller abuts against the outer wall of the inner door frame, and the other side abuts against the inner wall of the outer door frame; the outer door frame lateral roller abuts against the outer wall of the inner door frame; one side of the inner door frame longitudinal roller abuts against the inner wall On the outer wall of the door frame, the other side rests on the inner wall of the outer door frame; the lateral roller of the inner door frame rests on the inner wall of the outer door frame; the inner door frame slides along the outer door frame through the outer door frame longitudinal roller, the outer door frame lateral roller, the inner door frame longitudinal roller and the inner door frame lateral roller; the sliding plate longitudinal roller rests on the inner wall of the inner door frame; the sliding plate lateral roller rests on the inner wall of the inner door frame; the sliding plate slides along the inner door frame through the sliding plate longitudinal roller and the sliding plate lateral roller.

Furthermore, the load-bearing assembly includes: a fork frame fixedly connected to the sliding plate, a fork mounted on the fork frame through a spring locating pin, a loading plate fixed on the fork, and a steel wire rope for pulling the loading plate; one end of the steel wire rope is fixedly connected to the top end of the fork frame, and the other end is fixedly connected to the front end of the loading plate.

Furthermore, the conveying assembly includes: a conveying bracket placed on the carrying plate, a conveying motor installed on the conveying bracket, a driving wheel coaxially connected to the output shaft of the conveying motor, and a bearing roller group installed on the side frame; the bearing roller group rolls along the carrying plate.

Furthermore, the first driven sprocket is coaxially keyed and connected to the first drive shaft, the second driven sprocket is coaxially keyed and connected to the second drive shaft, a drive shaft bracket is installed on the conveying bracket, and the first drive shaft and the second drive shaft are both rotatably connected to the drive shaft bracket.

Furthermore, four conveyor belts are arranged side by side, and correspondingly, four first conveying rollers are arranged side by side on the first driving shaft, and four second conveying rollers are arranged side by side on the second driving shaft. One ends of the four conveyor belts are respectively wound around the first conveying rollers, and the other ends are wound around the first guide roller, the upper roller group, the lower roller group and the second guide roller in a clockwise manner, and then are wound around the second conveying rollers.

Furthermore, two adjacent conveyor belts are separated by a roller bracket, and the side frame and the roller bracket as well as two adjacent roller brackets are fixedly connected by a support frame.

Furthermore, the side frame and the roller bracket are both equipped with limiting plates for limiting the upward rollers, the downward rollers, the load-bearing rollers and the unloading rollers.

Furthermore, a plurality of anti-collision rollers are fixed to the outer side of the side frame; and a side baffle for preventing goods from tipping over is fixed to the top of the side frame.

The beneficial effects of the box truck bagged cargo loading robot of the present invention are:

1. The present invention drives the conveyor belt to move by the first driving motor, thereby driving the goods stacked on the conveyor belt to move forward, and the goods are unloaded into the carriage after passing through the unloading roller group. Since the inclination angle of the unloading roller group is small enough, the goods can be stably stacked into the carriage. The present invention has a reasonable structural design, occupies a small space and has a strong carrying capacity, can realize automatic loading of goods, and save manpower and material resources.

2. The present invention can adjust the height of the unloading assembly according to the height of different truck compartments through the lifting assembly, and has a wide range of applications. At the same time, multiple conveyor belts are designed to transport goods for loading at the same time, which greatly improves work efficiency and can ensure that the entire loading process is stable and efficient.

3. The movement routes of the lifting assembly and the conveying assembly of the present invention are both linear reciprocating motion. The overall structure is simple and reasonable, stable and reliable, and simplifies the position change of bagged goods during transportation.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

FIG1 is an overall structure diagram of an embodiment of the present invention;

FIG2 is a structural diagram of a cargo unloading assembly according to an embodiment of the present invention;

3 is a partial structural diagram of a conveyor belt drive assembly according to an embodiment of the present invention;

FIG4 is a structural diagram of a lifting assembly according to an embodiment of the present invention;

5 is a cross-sectional view of a lifting assembly according to an embodiment of the present invention;

FIG6 is a structural diagram of a bearing assembly according to an embodiment of the present invention;

FIG. 7 is a partial structural diagram of a conveying assembly according to an embodiment of the present invention.

In the figure: 1, lifting assembly, 11, outer door frame, 12, inner door frame, 13, sliding plate, 14, lifting hydraulic cylinder, 15, sprocket plate, 16, sprocket shaft, 17, sprocket, 18, third chain, 19, outer door frame longitudinal roller, 110, outer door frame lateral roller, 111, inner door frame longitudinal roller, 112, inner door frame lateral roller, 113, sliding plate longitudinal roller, 114, sliding plate lateral roller, 2, load-bearing assembly, 21, fork frame, 22, spring positioning pin, 23, fork, 24, loading plate, 25, wire rope, 3, conveying assembly, 31, conveying bracket, 32, conveying motor, 33, driving wheel, 34, load-bearing roller group, 4, unloading assembly, 40, side frame, 41, conveyor belt, 4 2. Conveyor belt drive assembly, 420. First drive motor, 421. Second drive motor, 422. First driving sprocket, 423. First driven sprocket, 424. First conveying roller, 425. Second driving sprocket, 426. Second driven sprocket, 427. Second conveying roller, 428. First guide roller, 429. Second guide roller, 4210. Upward roller group, 4211. Downward roller group, 4212. First drive shaft, 4213. Second drive shaft, 4214. Drive shaft bracket, 4215. First chain, 4216. Second chain, 43. Unloading ramp, 44. Unloading roller group, 5. Roller bracket, 6. Support frame, 7. Limit plate, 8. Anti-collision roller, 9. Side baffle.

Detailed ways

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

A specific embodiment of a box truck bagged cargo loading robot of the present invention as shown in Figures 1 to 7 includes: a lifting component 1, a bearing component 2 fixedly connected to the lifting component 1, and a conveying component 3 and an unloading component 4 installed on the bearing component 2; the loading robot is symmetrically distributed as a whole, and the structure is intuitive and clear. The cargo can be stably stacked into the compartment through the unloading component 4, and automatic loading of cargo can be realized, saving manpower and material resources, and ensuring that the entire loading process is stable and efficient.

Referring to Fig. 2 and Fig. 3, the unloading assembly 4 comprises: two side frames 40 arranged opposite to each other, at least one conveyor belt 41 for transferring bagged goods, and a conveyor belt driving assembly 42 for driving the conveyor belt 41; the conveyor belt driving assembly 42 is fixed on the conveying bracket 31, the front end of the side frame 40 has a downwardly inclined unloading slope 43, and an unloading roller group 44 is installed on the unloading slope 43; the conveyor belt driving assembly 42 comprises: a first driving motor 420 and a second driving motor 421 installed on the conveying bracket 31, and a first driving motor 420 and a second driving motor 421 connected to the first driving motor 420. The first driving sprocket 422 is coaxially connected to the output shaft, the first driven sprocket 423 is chain-drivenly connected to the first driving sprocket 422 through the first chain 4215, the first driving shaft 4212 is coaxially key-drivenly connected to the first driven sprocket 423, the first conveying roller 424 is sleeved on the first driving shaft 4212 and key-drivenly connected to the first driving shaft 4212, the second driving sprocket 425 is coaxially connected to the output shaft of the second driving motor 421, and the second driven sprocket 425 is chain-drivenly connected to the second driving sprocket 425 through the second chain 4216. 26, a second drive shaft 4213 coaxially key-connected with the second driven sprocket 426, a second conveying roller 427 sleeved on the second drive shaft 4213 and key-connected with the second drive shaft 4213, a guide roller bracket fixed to the rear end of the side frame 40, a first guide roller 428 and a second guide roller 429 mounted on the guide roller bracket, and an upward roller group 4210 and a downward roller group 4211 mounted on the side frame 40; one end of the conveying belt 41 is wound around the first conveying roller 424, and the other end is wound around the first guide roller 428 and the second guide roller 429 in a clockwise direction. 28. The upward roller group 4210, the downward roller group 4211 and the second guide roller 429 are then wound around the second conveying roller 427; the conveying belt 41 is fixed to the first conveying roller 424 and the second conveying roller 427 respectively through belt buckles and belt buckle joint pins. First, fix the belt buckles on the conveying belt 41 in a row with nails, and then connect and fix the belt buckles with belt buckle joint pins; a driving shaft bracket 4214 is installed on the conveying bracket 31, and the first driving shaft 4212 and the second driving shaft 4213 are both rotatably connected to the driving shaft bracket 4214. The unloading roller group 44 includes a plurality of unloading rollers, the upward roller group 4210 includes a plurality of upward rollers, the downward roller group 4211 includes a plurality of downward rollers, and the load-bearing roller group 34 includes a plurality of load-bearing rollers; when unloading starts, the first drive motor 420 starts working, driving the first active sprocket 422 to rotate, and driving the first driven sprocket 423 to rotate through the first chain 4215, thereby driving the first conveying roller 424 to rotate, thereby driving the conveyor belt 41 to rotate around the first conveying roller 424 and the second conveying roller 427, and the second conveying roller 427 passively rotates with the movement of the conveyor belt 41. When the goods move on the conveyor belt 41, the upward rollers and the downward rollers are responsible for supporting the conveyor belt 41 to ensure its smooth unloading. After the goods are transported by the conveyor belt 41, they are transported to the truck through the unloading roller group 44. Since the inclination angle of the unloading roller group 44 is small enough, the goods can be smoothly transported to the designated location. When unloading is completed, the conveyor belt 41 needs to be reset and the conveyor assembly 3 needs to be withdrawn. When the conveyor belt 41 is reset, the second driving motor 421 works to drive the second active sprocket 425 to rotate, and drives the second driven sprocket 426 to rotate through the second chain 4216, thereby driving the second conveying roller 427 to rotate, and the first driving motor 420 works passively. When the second conveying roller 427 rotates actively and the first conveying roller 424 rotates passively, the conveyor belt 41 returns to its initial state before unloading; when the conveyor assembly 3 needs to be withdrawn, the conveying motor 32 works, and the load-bearing roller group 34, the conveying bracket 31 and the driving wheel 33 support the conveyor assembly 3 to move backward. When the conveyor assembly 3 is completely moved to the load-bearing assembly 2, the lifting assembly 1 starts to work, and the lifting assembly 1 drives the load-bearing assembly 2 to descend, waiting for the next loading.

As shown in FIG. 2 , in this embodiment, four conveyor belts 41 are arranged side by side, and two adjacent conveyor belts 41 are separated by roller brackets 5. Correspondingly, four first conveying rollers 424 are sleeved side by side on the first driving shaft 4212, and four second conveying rollers 427 are sleeved side by side on the second driving shaft 4213. Four groups of ascending roller groups 4210 and four groups of descending roller groups 4211 are arranged side by side between the two side frames 40. Four first guide rollers 428 and four second guide rollers 429 are arranged side by side at the rear end of the side frame 40. Four groups of unloading roller groups 44 are arranged side by side on the unloading slope 43. Limiting plates 7 for limiting the ascending rollers, descending rollers, load-bearing rollers and unloading rollers are installed on the side frames 40 and the roller brackets 5. The middle ascending roller group 4210, the descending roller group 4211 and the unloading roller group 44 are connected by the limiting plates 7. Installed on the roller bracket 5; one end of the upward roller group 4210, the downward roller group 4211 and the unloading roller group 44 on both sides are installed on the side frame 40 through the limit plate 7, and the other end is installed on the roller bracket 5 through the limit plate 7; one end of the four conveyor belts 41 is respectively wound around the first conveying roller 424, and the other end is respectively wound around the first guide roller 428, the upward roller group 4210, the downward roller group 4211 and the second guide roller 429 in a clockwise direction and then wound around the second conveying roller 427; the side frame 40 and the roller bracket 5 and the two adjacent roller brackets 5 are fixedly connected by the support frame 6; the downward roller group 4211 cooperates with the upward roller group 4210 to enable the conveyor belt 41 to operate normally, and the upward roller group 4210 and the downward roller group 4211 are responsible for supporting the conveyor belt 41 to ensure smooth unloading of the conveyor belt 41. Since the goods are transported simultaneously by four conveyor belts 41 arranged side by side, the adjacent conveyor belts 41 are separated by roller brackets 5, and the roller brackets 5 are fixed by support frames 6. In order to ensure that the belt speeds of each conveyor belt 41 are consistent, four first conveyor rollers 424 are sleeved on a first drive shaft 4212 and driven by a first drive motor 420; four second conveyor rollers 427 are sleeved on a second drive shaft 4213 and driven by a second drive motor 421. The use of an unconventional conveyor belt 41 avoids the design of a tensioning device required for the conveyor belt 41 under normal circumstances, simplifies the overall structure, ensures that the entire loading process is stable and efficient, and the inclination angle of the unloading roller group 44 is small enough, so that the process of unloading the goods from the conveyor belt 41 is smoother and safer.

Referring to Figures 4 and 5, the lifting assembly 1 includes: an outer mast 11, an inner mast 12 slidably connected to the outer mast 11, a sliding plate 13 slidably connected to the inner mast 12, a plurality of lifting hydraulic cylinders 14 vertically fixed to the bottom end of the outer mast 11, a sprocket plate 15 coaxially fixedly connected to the telescopic end of the lifting hydraulic cylinder 14, a sprocket shaft 16 vertically fixed on the sprocket plate 15, a sprocket 17 sleeved on the sprocket shaft 16 and rotatably connected to the sprocket shaft 16, and a third chain 18 fixed to the cross beam of the outer mast 11 at one end by a chain bolt, and the other end of the third chain 18 passes over the sprocket 17 and is fixedly connected to the sliding plate 13 by the chain bolt; a connecting ear is provided at the bottom end of the sprocket plate 15, the telescopic end of the lifting hydraulic cylinder 14 is coaxially fixedly connected to the connecting ear by a connecting shaft, and the sprocket plate 15 is fixedly connected to the inner mast 12; when the telescopic end of the lifting hydraulic cylinder 14 pushes the sprocket plate 15 to move up and down, it drives the inner mast 12 to move up and down. The crossbeam of the outer door frame 11 is arranged in a U shape and fixed on both sides of the two columns of the outer door frame 11; the outer door frame longitudinal roller 19 and the outer door frame lateral roller 110 are fixed on the columns of the outer door frame 11; the inner door frame longitudinal roller 111 and the inner door frame lateral roller 112 are fixed on the columns of the inner door frame 12; the sliding plate longitudinal roller 113 and the sliding plate lateral roller 114 are fixed on the upper and lower ends of the sliding plate 13; one side of the outer door frame longitudinal roller 19 abuts against the outer wall of the inner door frame 12, and the other side abuts against the inner wall of the outer door frame 11; the outer door frame lateral roller 110 abuts against the outer wall of the inner door frame 12; the inner door frame longitudinal roller One side of the wheel 111 abuts against the outer wall of the inner door frame 12, and the other side abuts against the inner wall of the outer door frame 11; the inner door frame lateral roller 112 abuts against the inner wall of the outer door frame 11; the inner door frame 12 slides along the outer door frame 11 through the outer door frame longitudinal roller 19, the outer door frame lateral roller 110, the inner door frame longitudinal roller 111 and the inner door frame lateral roller 112; the sliding plate longitudinal roller 113 abuts against the inner wall of the inner door frame 12; the sliding plate lateral roller 114 abuts against the inner wall of the inner door frame 12; the sliding plate 13 slides along the inner door frame 12 through the sliding plate longitudinal roller 113 and the sliding plate lateral roller 114. The outer door frame 11 column and the inner door frame 12 column adopt a combination of CJ parallel door frame columns, which bear the force and cooperate with the outer door frame longitudinal roller 19, the outer door frame lateral roller 110, the inner door frame longitudinal roller 111 and the inner door frame lateral roller 112 to play the role of a guide rail, so that the inner door frame 12 can move up and down along the outer door frame 11; the application premise of the loading robot is that the bagged goods have been stacked for loading. When the bagged goods have been stacked and placed on the conveyor belt 41 for loading, the lifting hydraulic cylinder 14 starts to work, and the telescopic end telescopes to drive the sprocket plate 15 to move upward, driving the inner door frame 12 to move upward. At the same time, the third chain 18 starts to work, driving the sliding plate 13 to move upward along the inner door frame 12 column, thereby driving the fork frame 21 fixedly connected to the sliding plate 13 to move upward, and the fork frame 21 drives the fork 23 and the loading plate 24 to rise together to the designated position to be loaded.

As shown in FIG6 , the bearing assembly 2 includes: a fork frame 21 fixedly connected to the sliding plate 13, a fork 23 mounted on the fork frame 21 through a spring positioning pin 22, a loading plate 24 fixed on the fork 23, and a steel wire 25 for pulling the loading plate 24; one end of the steel wire 25 is fixedly connected to the top of the fork frame 21, and the other end is fixedly connected to the front end of the loading plate 24. The positioning of the fork 23 and the fork frame 21 is achieved by the spring positioning pin 22, which is set at the connection between the fork 23 and the fork frame 21. When the fork 23 needs to be removed, the spring positioning pin 22 only needs to be lifted, and the spring makes it easier to disassemble the fork 23.

Referring to FIG. 2 and FIG. 7 , the conveying assembly 3 comprises: a conveying bracket 31 placed on a bearing plate, at least one conveying motor 32 installed on the conveying bracket 31, a driving wheel 33 shaft coaxially connected to the output shaft of the conveying motor 32 through a coupling, a driving wheel 33 sleeved on the driving wheel 33 shaft and connected to the driving wheel 33 shaft key transmission, and a bearing roller group 34 installed on a side frame 40; the bearing roller group 34 rolls along the bearing plate; a driving bracket is fixed on the conveying bracket 31, and the driving wheel 33 shaft is connected to the driving bracket for rotation. In this embodiment, two conveying motors 32 are provided. When the bearing assembly 2 carries the conveying assembly 3 to the designated position to be loaded and needs to transport the goods forward, the conveying motor 32 starts to work, drives the driving wheel 33 to rotate, thereby driving the entire conveying assembly 3 and the unloading assembly 4 to move forward, completing the loading and transportation process, and preparing for the next step of unloading. The movement route of the goods from the lifting assembly 1 to the conveying assembly 3 is a straight line, and the movement process of the lifting assembly 1 and the conveying assembly 3 is reciprocating motion. The overall structure is simple and reasonable, stable and reliable, and simplifies the posture change during the transportation of bagged goods.

Since the loading robot needs to enter the interior of the carriage, when it moves in the carriage, the side frame 40 is likely to collide and rub against the inner wall of the carriage, so a plurality of anti-collision rollers 8 are fixed on the outside of the side frame 40, which can effectively avoid collision and friction and ensure the smooth movement of the conveying component 3; in order to facilitate palletizing, a side baffle 9 is fixed on the top of the side frame 40 to prevent the goods from tipping over, which can effectively prevent the goods from tipping over.

It should be understood that the specific embodiments described above are only used to explain the present invention, and are not used to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims (6)

1. A robot for loading bagged goods into a van, characterized in that it comprises a lifting assembly (1), a bearing assembly (2) fixedly connected to the lifting assembly (1), a conveying assembly (3) mounted on the bearing assembly (2), and an unloading assembly (4) mounted on the conveying assembly (3); the bearing assembly (2) comprises a fork frame (21) fixedly connected to a sliding plate (13) of the lifting assembly (1), a fork (23) mounted on the fork frame (21) via a spring positioning pin (22), and a fork (23) fixed to the fork (23). The loading plate (24) on the fork frame (21) and a steel wire rope (25) for pulling the loading plate (24); one end of the steel wire rope (25) is fixedly connected to the top end of the fork frame (21), and the other end is fixedly connected to the front end of the loading plate (24); the unloading assembly (4) comprises: two side frames (40) arranged opposite to each other on the left and right, at least one conveyor belt (41) for transferring bagged goods, and a conveyor belt driving assembly (42) for driving the conveyor belt (41); the front end of the side frame (40) has a downwardly inclined unloading slope (43) installed on the The unloading roller group (44) on the unloading slope (43); the conveyor belt drive assembly (42) comprises: a first drive motor (420) and a second drive motor (421) installed on the conveying assembly (3), a first driving sprocket (422) coaxially connected to the output shaft of the first drive motor (420), a first driven sprocket (423) chain-drivenly connected to the first driving sprocket (422), a first conveying roller (424) coaxially arranged with the first driven sprocket (423), and a first conveying roller (424) coaxially arranged with the second drive motor (421). ), a second driving sprocket (425) coaxially connected to the output shaft of the side frame (40), a second driven sprocket (426) chain-drivenly connected to the second driving sprocket (425), a second conveying roller (427) coaxially arranged with the second driven sprocket (426), a first guide roller (428) and a second guide roller (429) mounted at the rear end of the side frame (40), and an upward roller group (4210) and a downward roller group (4211) mounted on the side frame (40); one end of the conveying belt (41) is wound around the first conveying roller (424 ), the other end of the conveying assembly (3) is wound around the first guide roller (428), the upward roller group (4210), the downward roller group (4211) and the second guide roller (429) in a clockwise manner and then wound around the second conveying roller (427); the first driven sprocket (423) is coaxially key-connected to the first drive shaft (4212), the second driven sprocket (426) is coaxially key-connected to the second drive shaft (4213), the conveying bracket (31) of the conveying assembly (3) is equipped with a drive shaft bracket (4214), the first drive shaft ( 4212) and the second drive shaft (4213) are both rotatably connected to the drive shaft bracket (4214); the conveying assembly (3) comprises: a conveying bracket (31) placed on the loading plate (24), at least one conveying motor (32) installed on the conveying bracket (31), a driving wheel (33) coaxially connected to the output shaft of the conveying motor (32), and a bearing roller group (34) installed on the side frame (40); the bearing roller group (34) rolls along the loading plate (24); when the bearing assembly (2) When the conveying assembly (3) carrying the goods arrives at the designated position to be loaded and needs to be transported forward, the conveying motor (32) starts to work, driving the driving wheel (33) to rotate, thereby driving the entire conveying assembly (3) and the unloading assembly (4) to move forward, completing the loading and transportation process and preparing for the next step of unloading; the conveyor belt (41) is arranged in parallel with four, and correspondingly, the first driving shaft (4212) is provided with four first conveying rollers (424) in parallel, and the second driving shaft (4213) is provided with four first conveying rollers (424) in parallel. Four second conveying rollers (427) are sleeved, one end of the four conveying belts (41) is respectively wound around the first conveying roller (424), and the other end is sequentially wound clockwise around the first guide roller (428), the upward roller group (4210), the downward roller group (4211) and the second guide roller (429) and then wound around the second conveying roller (427); the conveying belt (41) is respectively fixed to the first conveying roller (424) and the second conveying roller (427) by means of a belt buckle and a belt buckle joint pin. 2. A box truck bagged cargo loading robot according to claim 1, characterized in that: the lifting assembly (1) comprises: an outer door frame (11), an inner door frame (12) slidably connected to the outer door frame (11), a sliding plate (13) slidably connected to the inner door frame (12), a plurality of lifting hydraulic cylinders (14) fixed at the bottom end of the outer door frame (11), a sprocket plate (15) coaxially fixedly connected to the telescopic end of the lifting hydraulic cylinder (14), a sprocket shaft (16) vertically fixed to the sprocket plate (15), a sprocket (17) rotatably connected to the sprocket shaft (16), and a third chain (18) fixed at one end to the crossbeam of the outer door frame (11), the other end of the third chain (18) passing over the sprocket (17) and fixedly connected to the sliding plate (13); the sprocket plate (15) is fixedly connected to the inner door frame (12). 3. A box truck bagged cargo loading robot according to claim 2, characterized in that: the outer door frame (11) is fixed with an outer door frame longitudinal roller (19) and an outer door frame lateral roller (110); the inner door frame (12) is fixed with an inner door frame longitudinal roller (111) and an inner door frame lateral roller (112); the upper and lower ends of the sliding plate (13) are fixed with sliding plate longitudinal rollers (113) and sliding plate lateral rollers (114); one side of the outer door frame longitudinal roller (19) abuts against the outer wall of the inner door frame (12), and the other side abuts against the inner wall of the outer door frame (11); the outer door frame lateral roller (110) abuts against the outer wall of the inner door frame (12); the inner door frame longitudinal roller (111) is fixed with a sliding plate longitudinal roller (113) and a sliding plate lateral roller (114). One side abuts against the outer wall of the inner door frame (12), and the other side abuts against the inner wall of the outer door frame (11); the inner door frame lateral roller (112) abuts against the inner wall of the outer door frame (11); the inner door frame (12) slides along the outer door frame (11) through the outer door frame longitudinal roller (19), the outer door frame lateral roller (110), the inner door frame longitudinal roller (111) and the inner door frame lateral roller (112); the sliding plate longitudinal roller (113) abuts against the inner wall of the inner door frame (12); the sliding plate lateral roller (114) abuts against the inner wall of the inner door frame (12); the sliding plate (13) slides along the inner door frame (12) through the sliding plate longitudinal roller (113) and the sliding plate lateral roller (114). 4. A van-type bagged cargo loading robot according to claim 1, characterized in that: two adjacent conveyor belts (41) are separated by a roller bracket (5), and the side frame (40) and the roller bracket (5) as well as two adjacent roller brackets (5) are fixedly connected by a support frame (6). 5. A box truck bagged cargo loading robot according to claim 4, characterized in that: the side frame (40) and the roller bracket (5) are both equipped with limiting plates (7) for limiting the upward rollers, the downward rollers, the load-bearing rollers and the unloading rollers. 6. A box truck bagged cargo loading robot according to claim 1, characterized in that: a plurality of anti-collision rollers (8) are fixed to the outer side of the side frame (40); and a side baffle (9) for preventing cargo from tipping over is fixed to the top of the side frame (40).