Conveying belt or mesh belt type conveying line automatic discharging device and conveying method

Abstract

The invention discloses a conveyor belt or mesh belt type conveyor line automatic discharging device and a conveying method. The conveyor belt or mesh belt type conveyor line automatic discharging device comprises a rack, a first-stage conveyor belt, a second-stage conveyor belt, a material box storage device and a material box feeding device, wherein the first-stage conveyor belt and the second-stage conveyor belt are controlled by a conveyor belt motor; the first-stage conveying belt is mounted above the second-stage conveying belt, and a gap between the first-stage conveying belt and the second-stage conveying belt is larger than the height of the material box, so that the material box can be conveyed below the first-stage conveying belt and on the second-stage conveying The material box storage device is installed at the side end of the first-stage conveying belt, material boxes stacked up and down are stored in the material box storage device, and the material box feeding device is installed at the bottom of the material box storage device. Workpieces are buffered through the first-stage conveying belt, the falling height of the workpieces is effectively reduced, the edge knocking proportion of products is greatly reduced, automatic feeding of the material boxes is achieved, conveying of the material boxes is controlled through the second-stage conveying belt, the workpieces are evenly laid in the material boxes, the labor intensity is reduced, manual discharging is replaced, and the labor cost is reduced; and material bumping and scratching caused by uncontrollability are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of conveying equipment, and in particular, relates to an automatic unloading device for a conveyor belt or mesh belt type conveyor line and a conveying method. Background Art

[0002] NdFeB permanent magnet materials have rapidly entered the industrialized society with their excellent magnetic properties, price ratio and abundant resource reserves. However, NdFeB materials have many surface pores, are loose and rough, and are very easy to oxidize and rust, so they need to be cleaned during the production process. In the automatic production process, after the workpiece is cleaned and dried, the magnets are scattered and spread on the conveyor belt or mesh belt conveyor line, and then dried and other treatments are carried out in the middle. Finally, the workpiece needs to be collected from the conveyor belt or mesh belt and placed in a material box or other designated tooling.

[0003] However, in the above production process, the work of collecting the workpieces from the conveyor belt or mesh belt and placing them in the material box still needs to rely on manual operation. Because the NdFeB material is a metal material, the workpieces are prone to collision during manual operation, causing edge knocks and scratches. At the same time, because the previous production process is automated, the production process is fast-paced and continuous, so the labor intensity of manual collection is extremely high. Summary of the invention

[0004] The present invention aims to provide an automatic unloading device and conveying method for a conveyor belt or mesh belt conveyor line, which buffers the workpiece by a primary conveyor belt, effectively reduces the falling height of the workpiece, greatly reduces the proportion of product edge knocking, and realizes automatic feeding of the material box.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an automatic unloading device for a conveyor belt or mesh belt conveyor line, comprising a frame, a primary conveyor belt and a secondary conveyor belt controlled by a conveyor belt motor, a material box storage device and a material box feeding device; the primary conveyor belt is installed above the secondary conveyor belt, and the gap between the primary conveyor belt and the secondary conveyor belt is greater than the height of the material box, so that the material box can be under the primary conveyor belt and conveyed on the secondary conveyor belt; the material box storage device is installed at the side end of the primary conveyor belt, and the material box storage device stores material boxes stacked up and down, and the material box feeding device is installed at the bottom of the material box storage device.

[0006] In one embodiment of the present invention, the height of the lower end plane of the material box storage device is consistent with or slightly higher than the horizontal height of the plane on the secondary conveyor belt by 1-3 mm, and is configured to move the material box in the material box storage device to the secondary conveyor belt by sliding.

[0007] In one embodiment of the present invention, the automatic unloading device of the conveyor belt or mesh belt conveyor line also includes a guide plate, and the primary conveyor belt is connected to the equipment conveyor belt or mesh belt through the guide plate. When the workpiece slides onto the guide plate, it slides onto the primary conveyor belt; the guide plate is also configured with a guide plate sensor for sensing the workpiece sliding down the mesh belt, and controlling the start of the primary conveyor belt through the sensor signal.

[0008] In one embodiment of the present invention, the primary conveyor belt is connected to the guide plate through a PLC control system. After the sensor recognizes that there is no workpiece sliding continuously on the guide plate, the primary conveyor belt stops conveying. When the workpiece conveyed by the primary conveyor belt slides below the end through conveyance, it is automatically conveyed by the secondary conveyor belt to the material box at the position where the workpiece slides.

[0009] In one embodiment of the present invention, the gap between the primary conveyor belt and the secondary conveyor belt needs to be 5-10 mm greater than the height of the material box.

[0010] In one embodiment of the present invention, a material box located on the secondary conveyor belt is automatically pushed to the gap between the secondary conveyor belt and the primary conveyor belt by a material box feeding device; a material box sensing sensor is also arranged on the secondary conveyor belt perpendicular to the forward direction of the conveyor belt and on the side of the material box storage device close to the conveyor belt, which can sense whether the material box is pushed to the specified position; the material box of the secondary conveyor belt controls the forward and stop positions of the secondary conveyor belt through the PLC control system.

[0011] For example, the secondary conveyor belt has a single conveying distance of 18mm and stops for 5s. This cycle is repeated to ensure that the workpieces in the material box are spread out flat without accumulation.

[0012] In one embodiment of the present invention, the material box feeding device includes a material box lifting cylinder, a shift cylinder, a lifting plate, a lifting cylinder entry and exit platform and a material box pushing cylinder; wherein, the lifting plate is installed on the upper end of the lifting cylinder, the lifting cylinder is installed on the upper end of the lifting cylinder entry and exit platform, and the lifting cylinder entry and exit platform is fixed on the upper end of the shift cylinder.

[0013] In one embodiment of the present invention, the height of the lifting plate of the material box lifting cylinder is 5-8mm higher than the height of the lowest material box and lower than the height of the side edge of the second material box, so that the lifting plate is pushed by the shift cylinder between the edges of the first and second material boxes at the lower end; a proximal sensor is arranged on the secondary conveyor belt at the end position of the primary conveyor belt and at the position where the workpiece slides from the primary conveyor belt to the secondary conveyor belt; after the proximal sensor senses the material box, it enters the material box receiving state; after the workpiece transported by the primary conveyor belt slides into the material box, the secondary conveyor belt is controlled by the PLC control system to transport the material box forward.

[0014] In one embodiment of the present invention, a material box far-end sensor is arranged on the secondary conveyor belt at a position directly below the end edge of the primary conveyor belt and 190 mm away from the width of a single material box in the conveying direction of the secondary conveyor belt; when the primary conveyor belt is conveying workpieces, when the material box far-end sensor on the secondary conveyor belt senses the material box, the primary conveyor belt stops, the material box feeding device pushes in the next material box, and the secondary conveyor belt starts to convey the material box to the proximal sensor position.

[0015] According to another aspect of the present invention, there is also provided a conveying method of an automatic unloading device of a conveyor belt or mesh belt conveyor line, comprising the following steps:

[0016] S1, put the material box into the material box storage device, the material boxes are stacked up and down, and the height of the lifting plate of the material box lifting cylinder is 5-8mm higher than the height of the lowest material box and lower than the height of the side edge of the second material box, so that the lifting plate can be pushed by the shift cylinder between the edges of the first and second material boxes at the lower end;

[0017] S2, the lifting cylinder is shifted by the shift cylinder, and the lifting plate is pushed between the edges of the first and second material boxes at the lower end; the lifting cylinder rises, and the lifting plate lifts the second material box and the above material boxes, and the first material box at the lower end is separated from the second material box and stays at the bottom of the material box storage device;

[0018] S3, after the first material box at the lower end of the material box storage device is separated, the material box is pushed out by the material box pushing cylinder to the specified position between the secondary conveyor belt and the primary conveyor belt; on the secondary conveyor belt, the material box pushed to the specified position by the material box feeding device is controlled by the sensor and the PLC control system to start the secondary conveyor belt to convey the material box;

[0019] S4, a proximal sensor is provided on the secondary conveyor belt at the end of the primary conveyor belt and at the position where the workpiece slides from the primary conveyor belt to the secondary conveyor belt. After sensing the material box, the material box enters the material receiving state, and the workpiece conveyed by the primary conveyor belt slides into the material box. The secondary conveyor belt is controlled by the PLC control system to convey the material box forward;

[0020] A remote sensor is provided on the secondary conveyor belt at the end of the primary conveyor belt and the position where the workpiece slides from the primary conveyor belt to the secondary conveyor belt, about 190 mm from the position of a material box. When the primary conveyor belt is conveying the workpiece, the primary conveyor belt stops when the remote sensor senses the material box, and the material box feeding device pushes in the next material box.

[0021] S5, the secondary conveyor starts and transports the material box to the near-end sensor position; the primary conveyor starts and continues to transport the workpieces into the material box; when the secondary conveyor is transporting, the material box that is full of workpieces moves forward synchronously, and only 1-4 material boxes full of workpieces need to be manually processed together.

[0022] Beneficial effects of the present invention:

[0023] The automatic unloading device for the conveyor line of the present invention mainly includes a conveyor belt motor, a frequency converter, a sensor, a chain conveyor belt (a primary conveyor belt, a secondary conveyor belt), a combined cylinder (a material box lifting cylinder, a material box pushing cylinder), a touch screen and a PLC control system. It can sense the workpiece on the flat conveyor belt or mesh belt through the sensor, convey the conveyor belt and automatically push the material box in, so that the material automatically falls into the material box of the unloading device. During the automatic operation of the device, the vertically stored material box can be automatically separated and pushed onto the secondary conveyor belt. At the same time, the device reduces the falling height of the workpiece through the two-stage transmission mechanism, reducing the collision between materials. The material slides from the mesh belt conveyor line to the primary conveyor belt, and the primary conveyor belt transports the material to the unloading material box. The present device realizes the automatic unloading of materials in boxes for conveyor belts or mesh belt conveyor lines, and the materials are automatically and evenly laid into the unloading material box.

[0024] The present invention uses a primary conveyor belt to buffer the workpiece, effectively reducing the falling height of the workpiece, greatly reducing the proportion of product edge knocking, realizing automatic feeding of the material box, and controlling the transportation of the material box through the secondary conveyor belt to achieve uniform placement of the workpiece in the material box, thereby reducing labor intensity. It can also replace manual unloading, reduce labor costs, avoid material knocks and scratches caused by the uncontrollable nature of manual unloading operations, and improve the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional diagram of the overall structure of the automatic unloading device for a conveyor belt or mesh belt type conveyor line of the present invention;

[0026] Figure 2 It is a front view of the overall structure of the automatic unloading device of the conveyor belt or mesh belt type conveyor line of the present invention;

[0027] Figure 3 It is a side view of the overall structure of the automatic unloading device of the conveyor belt or mesh belt type conveyor line of the present invention;

[0028] Figure 4 It is a partially enlarged schematic diagram of the present invention.

[0029] Figure markings: 1-frame; 11-primary conveyor belt; 101-guide plate; 102-guide plate sensor; 21-secondary conveyor belt; 3-material box storage device; 4-material box feeding device; 301-material box sensing sensor; 401-lifting cylinder; 402-shifting cylinder; 403-material box pushing cylinder; 404-lifting cylinder entry and exit platform; 405-lifting plate; 51-proximal sensor; 52-distal sensor. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be emphasized that the specific embodiments described herein are only used to better illustrate the present invention, are some embodiments of the present invention, not all embodiments, and are not used to limit the present invention. In addition, the technical features involved in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Reference Figure 1 As shown, the present invention provides an automatic unloading device for a conveyor belt or mesh belt conveyor line, comprising a frame 1, a primary conveyor belt 11, a secondary conveyor belt 21, a material box storage device 3 and a material box feeding device 4. The primary conveyor belt 11 is installed above the secondary conveyor belt 21, and both are fixed on the frame 1. The box storage device 3 is installed at the side end of the primary conveyor belt 11, and the material box storage device 3 stores material boxes stacked up and down, and the material box feeding device 4 is installed at the bottom of the material box storage device 3.

[0032] Preferably, the height of the lower plane of the material box storage device 3 is consistent with or slightly higher than the horizontal height of the plane on the secondary conveyor belt 21 by 1-3 mm, so that the material box in the material box storage device 3 can be moved to the secondary conveyor belt 21 by sliding.

[0033] like Figure 2 As shown, the primary conveyor belt 11 is connected to the guide plate 101 through the PLC control system, and the primary conveyor belt 11 is connected to the equipment conveyor belt or mesh belt through the guide plate 101. When the workpiece slides onto the guide plate 101, it slides onto the primary conveyor belt 11. The guide plate 101 is equipped with a guide plate sensor 102, which can be used to sense the workpiece sliding off the mesh belt, and control the start of the primary conveyor belt 11 through the sensor 102 signal. The workpiece transported by the primary conveyor belt 11 slides to the bottom of the end of the primary conveyor belt 11 through transportation, and is automatically transported by the secondary conveyor belt 21 to the material box at the position where the workpiece slides off. When the sensor 102 recognizes that there is no workpiece sliding on the guide plate 101 continuously, the primary conveyor belt 11 stops transporting.

[0034] Preferably, the gap between the primary conveyor belt 11 and the secondary conveyor belt 21 needs to be 5-10 mm larger than the height of the material box, so that the material box can be under the primary conveyor belt 11 and conveyed on the secondary conveyor belt 21.

[0035] According to the present invention, the material box of the secondary conveyor belt 21 controls the forward and stop positions of the secondary conveyor belt 21 through the PLC control system. For example, the secondary conveyor belt 21 conveys a distance of 18 mm in a single time and stops for 5 seconds. This cycle is repeated to ensure that the workpieces in the material box are spread out flat without accumulation. The material box on the secondary conveyor belt 21 is automatically pushed to the material box feeding position in the gap between the secondary conveyor belt 21 and the primary conveyor belt 11 by the material box feeding device 4.

[0036] According to the present invention, a material box sensing sensor 301 is arranged on the side of the material box storage device 3 close to the conveyor belt, and at the material box feeding position in the gap between the secondary conveyor belt 21 and the primary conveyor belt 11, it can sense whether the material box is pushed to the specified position.

[0037] like Figure 3-4 As shown, the material box feeding device 4 includes a material box lifting cylinder 401, a shift cylinder 402, a lifting plate 405, a lifting cylinder in-and-out platform 404, and a material box pushing cylinder 403. Among them, the lifting plate is installed on the upper end of the material box lifting cylinder 401, the material box lifting cylinder 401 is installed on the upper end of the lifting cylinder in-and-out platform 404, and the lifting cylinder in-and-out platform is fixed on the upper end of the shift cylinder.

[0038] The specific operation is as follows: After the material box is placed in the material box storage device, the material boxes are stacked up and down, and the height of the lifting plate of the material box lifting cylinder is 5-8mm higher than the height of the lowest material box, and lower than the height of the side edge of the second material box, so that the lifting plate is pushed between the edges of the first and second material boxes at the lower end by the shift cylinder. The material box lifting cylinder is shifted by the shift cylinder, and the lifting plate is pushed between the edges of the first and second material boxes at the lower end. The material box lifting cylinder rises, and the lifting plate lifts the second material box and above, and the first material box at the lower end is separated from the second material box and stays at the bottom of the material box storage device. Furthermore, after the first material box at the lower end of the material box storage device is separated, the material box is pushed out by the material box push-out cylinder and pushed to the specified position in the gap between the secondary conveyor belt 21 and the primary conveyor belt 11. On the secondary conveyor belt 21, the material box pushed to the specified position by the material box feeding device 4 controls the secondary conveyor belt 21 to start through sensor induction and the PLC control system to convey the material box.

[0039] Preferably, a proximal sensor 51 is arranged on the secondary conveyor belt 21 at the end of the primary conveyor belt 11 and at the position where the workpiece slides from the primary conveyor belt 11 to the secondary conveyor belt 21. After the proximal sensor 51 senses the material box, it enters the material box receiving state. The primary conveyor belt 11 conveys the workpiece, which slides into the material box, and the secondary conveyor belt 21 is controlled by the PLC control system to convey the material box forward.

[0040] Preferably, a material box distal sensor 52 is also provided on the secondary conveyor belt 21 at a position directly below the end edge of the primary conveyor belt 11 and at a certain distance (e.g., 190 mm) from the width of a single material box in the conveying direction of the secondary conveyor belt 21. During the process of the primary conveyor belt 11 conveying workpieces, when the distal sensor 52 on the secondary conveyor belt 21 senses the material box, the primary conveyor belt stops, and the material box feeding device pushes in the next material box. Furthermore, the secondary conveyor belt 21 starts to convey the material box to the position of the proximal sensor 51. The primary conveyor belt 11 starts to continue conveying workpieces into the material box. When the secondary conveyor belt 21 is conveying, the material boxes that are already full of workpieces move forward synchronously, and only 1-4 material boxes full of workpieces need to be manually processed together.

[0041] The above is only a preferred application implementation of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automatic unloading device for a conveyor belt or mesh belt conveyor line, characterized in that: It comprises a frame (1), a primary conveyor belt (11) and a secondary conveyor belt (21) controlled by a conveyor belt motor, a material box storage device (3) and a material box feeding device (4); The primary conveyor belt (11) is fixed on the frame (1) and is located above the secondary conveyor belt (21); the gap between the primary conveyor belt (11) and the secondary conveyor belt (21) is greater than the height of the material box, so that the material box can be under the primary conveyor belt (11) and conveyed on the secondary conveyor belt (21); The material box storage device (3) is installed at the side end of the primary conveyor belt (11), and the material box storage device (3) stores material boxes stacked up and down, and the material box feeding device (4) is installed at the bottom of the material box storage device (3).

2. The automatic unloading device for a conveyor belt or mesh belt conveyor line according to claim 1, characterized in that: The height of the plane at the lower end of the material box storage device (3) is consistent with or slightly higher than the horizontal height of the plane on the secondary conveyor belt (21) by 1-3 mm, and is configured to move the material box in the material box storage device (3) onto the secondary conveyor belt (21) by sliding.

3. The automatic unloading device for a conveyor belt or mesh belt conveyor line according to claim 1, characterized in that: It also includes a guide plate (101), and the primary conveyor belt (11) is connected to the equipment conveyor belt or mesh belt through the guide plate (101). When the workpiece slides onto the guide plate (101), it slides onto the primary conveyor belt (11); the guide plate (101) is also configured with a guide plate sensor (102) for sensing the workpiece sliding off the mesh belt, and controlling the start of the primary conveyor belt 11 through the sensor (102) signal.

4. The automatic unloading device for a conveyor belt or mesh belt conveyor line according to claim 3, characterized in that: The primary conveyor belt (11) is connected to the guide plate (101) via a PLC control system; when the sensor (102) identifies that no workpieces have continuously slid off the guide plate (101), the primary conveyor belt (11) stops conveying; when the workpiece conveyed by the primary conveyor belt (11) slides below the end through conveyance, it is automatically conveyed by the secondary conveyor belt (21) to a material box at the position where the workpiece has slid off.

5. The automatic unloading device for a conveyor belt or mesh belt conveyor line according to claim 1, characterized in that: The gap between the primary conveyor belt (11) and the secondary conveyor belt (21) must be 5-10 mm greater than the height of the material box, so that the material box can be under the primary conveyor belt (11) and conveyed on the secondary conveyor belt (21).

6. The automatic unloading device for a conveyor belt or mesh belt conveyor line according to claim 1, characterized in that: The material box located on the secondary conveyor belt (21) is automatically pushed to the gap between the secondary conveyor belt (21) and the primary conveyor belt (11) by the material box feeding device (4); a material box sensing sensor (301) is also arranged on the secondary conveyor belt (21) perpendicular to the advancing direction of the conveyor belt and on the side of the material box storage device (3) close to the conveyor belt, which can sense whether the material box has been pushed to a specified position; The material box of the secondary conveyor belt (21) controls the advancing and stopping positions of the secondary conveyor belt (21) through a PLC control system. For example, the secondary conveyor belt (21) has a single conveying distance of 18 mm and stops for 5 seconds. This cycle is followed to ensure that the workpieces in the material box are spread out evenly without accumulation.

7. The automatic unloading device for a conveyor belt or mesh belt conveyor line according to claim 1, characterized in that: The material box feeding device (4) comprises a material box lifting cylinder (401), a shifting cylinder (402), a lifting plate (405), a lifting cylinder inlet and outlet platform (404) and a material box pushing cylinder (403); The lifting plate (405) is installed on the upper end of the material box lifting cylinder (401), the lifting cylinder (401) is installed on the upper end of the lifting cylinder entry and exit platform (404), and the lifting cylinder entry and exit platform (404) is fixed on the upper end of the shift cylinder (402).

8. The automatic unloading device for a conveyor belt or mesh belt conveyor line according to claim 1, characterized in that: The height of the lifting plate (405) of the material box lifting cylinder (401) is 5-8 mm higher than the height of the lowest material box and lower than the height of the side edge of the second material box, so that the lifting plate (405) can be pushed between the edges of the first and second material boxes at the lower end by the shift cylinder (402); A proximal sensor (51) is arranged on the secondary conveyor belt (21) at the end position of the primary conveyor belt (11) and at the position where the workpiece slides from the primary conveyor belt (11) to the secondary conveyor belt (21); after the proximal sensor (51) senses the material box, it enters a material box receiving state; after the workpiece conveyed by the primary conveyor belt (11) slides into the material box, the secondary conveyor belt (21) is controlled by the PLC control system to convey the material box forward.

9. The automatic unloading device for a conveyor belt or mesh belt conveyor line according to claim 1, characterized in that: A material box distal end sensor (52) is arranged on the secondary conveyor belt (21) at a position just below the end edge of the primary conveyor belt (11) and at a certain distance from the width of a single material box in the conveying direction of the secondary conveyor belt (21); when the primary conveyor belt (11) is conveying a workpiece, when the material box distal end sensor (52) on the secondary conveyor belt (21) senses the material box, the primary conveyor belt (11) stops, the material box feeding device pushes in the next material box, and the secondary conveyor belt (21) starts to convey the material box to the position of the proximal end sensor (51).

10. A conveying method using the automatic unloading device of the conveyor belt or mesh belt conveyor line according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, placing the material box into the material box storage device 3, the material boxes are stacked up and down, the height of the lifting plate (405) of the material box lifting cylinder (401) is 5-8mm higher than the height of the lowest material box, and lower than the height of the side edge of the second material box, so that the lifting plate (405) can be pushed by the shift cylinder (402) between the edges of the first and second material boxes at the lower end; S2, the lifting cylinder (401) is displaced by the shifting cylinder (402), and the lifting plate (405) is pushed between the edges of the first and second material boxes at the lower end; the lifting cylinder (401) rises, and the lifting plate (405) lifts the second material box and the above material boxes, and the first material box at the lower end is separated from the second material box and stays at the bottom of the material box storage device (3); S3, after the first material box at the lower end of the material box storage device (3) is separated, the material box push-out cylinder (403) pushes out the material box to a designated position between the secondary conveyor belt (21) and the primary conveyor belt (11); the material box pushed to the designated position on the secondary conveyor belt (21) by the material box feeding device (4) is controlled by the sensor and the PLC control system to start the secondary conveyor belt (21) to convey the material box; S4, a proximal sensor (51) is provided on the secondary conveyor belt (21) at the end of the primary conveyor belt (11) and at the position where the workpiece slides from the primary conveyor belt (11) to the secondary conveyor belt (21), and after sensing the material box, the material box enters a material receiving state, and the workpiece conveyed by the primary conveyor belt (11) slides into the material box, and the secondary conveyor belt (21) is controlled by the PLC control system to convey the material box forward; A remote sensor (52) is provided on the secondary conveyor belt (21) at a position about 190 mm from the end of the primary conveyor belt (11) and the position where the workpiece slides from the primary conveyor belt (11) to the secondary conveyor belt (21) and is about the position of a material box. When the primary conveyor belt (11) is conveying the workpiece, the primary conveyor belt (11) stops when the remote sensor (52) senses the material box, and the material box feeding device pushes in the next material box. S5, the secondary conveyor belt (21) is started to convey the material box to the position of the near-end sensor (51), and the primary conveyor belt (11) is started to continue conveying the workpieces into the material box; when the secondary conveyor belt (21) is conveying, the material boxes filled with workpieces move forward synchronously, and only 1-4 material boxes filled with workpieces need to be manually processed together.

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