Automatic zongzi sorting device based on visual inspection

Abstract

The invention relates to the technical field of visual inspection, and discloses an automatic zongzi sorting device based on visual inspection, the device comprises a conveying belt, the two sides of the conveying belt are both provided with protective plates; a rack is arranged on one protective plate, and a CCD (Charge Coupled Device) camera is arranged on the rack; a defective product protecting and conveying mechanism is arranged on the outer wall of the other protecting plate; and a qualified product protecting and conveying mechanism is arranged at the tail end of the conveying belt. According to the device, the servo gear is meshed with the fluted disc, so that the rotary disc rotates, the CCD camera shoots all-dimensional images of zongzi for detection, the air nozzle blows detected defective zongzi into the defective product protection conveying mechanism, the servo motor drives the conveying belt to operate, and meanwhile, the defective zongzi can be detected. And a spiral conveyor in the defective product spiral conveying cylinder is driven by the first transmission unit to rotate downwards for conveying, so that the situation that the defective rice dumplings directly fall into a basket to cause secondary damage after being rejected is avoided. Intelligent soft sorting of the rice dumplings is achieved, and the production efficiency and the product quality are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of visual detection, and in particular, relates to an automatic rice dumpling sorting device based on visual detection. Background Art

[0002] In recent years, the scale of the rice dumpling market has continued to expand, and the level of automation in rice dumpling production has continued to improve. However, there are still some technical difficulties in the automated production of rice dumplings, such as quality control, sorting and packaging of rice dumplings, which affect the production efficiency and quality of rice dumplings. At present, in the automated production of rice dumplings, due to the lack of effective rice dumpling quality inspection and sorting technology, quality problems such as exposed rice, rotten corners, and off-line often occur, resulting in a large number of rice dumplings being eliminated or returned, causing waste of resources and economic losses. At the same time, due to the different shapes and sizes of rice dumplings, it is difficult to achieve accurate packaging and packing, and manual sorting and placement are required, which increases labor costs and labor intensity. Especially before and after the rice dumplings are steamed, because the skin of the rice dumplings is thin and easy to break, it is necessary to carefully put the rice dumplings in or out of the basket manually to prevent the rice dumplings from breaking or falling apart. This is a burden on the workers' eyes and lumbar spine, and is not conducive to the workers' health and safety.

[0003] The Chinese patent with publication number CN 211757000 U and titled "A Zongzi Sorting and Transporting Device" designs a structure for manually sorting zongzi, which solves the problem that the existing transmission device needs to temporarily set the equipment when changing the flavor of zongzi for transportation. The number of zongzi at the discharge port is counted by setting a detection device at the discharge port of the transmission channel. This solution solves the problem of timely adjustment and automatic counting according to the flavor of zongzi, but does not realize the problem of zongzi quality detection and easy damage of zongzi. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic sorting device for rice dumplings based on visual detection, which aims to realize automatic detection and sorting of rice dumplings through computer vision and machine learning technology, thereby improving the production efficiency and quality of rice dumplings, reducing labor costs and labor intensity, and ensuring the health and safety of workers.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0006] An automatic rice dumpling sorting device based on visual detection comprises a conveyor belt, and guard plates are arranged on both sides of the conveyor belt;

[0007] A stand is installed on one of the guard plates, and a visual inspection device is installed on the stand. The visual inspection device includes a first CCD camera and a second CCD camera. The first CCD camera is located directly above the conveyor belt and is arranged downward to obtain a top view image of the zongzi; the second CCD camera is located above the side of the conveyor belt and is arranged in the direction of the conveyor belt to obtain images of the surroundings of the zongzi;

[0008] The outer wall of the other guard plate is provided with a defective product protection and conveying mechanism for removing and conveying the detected defective rice dumplings; a qualified product protection and conveying mechanism is provided at the end of the conveyor belt for collecting and conveying the detected qualified rice dumplings.

[0009] As a preferred embodiment of the present invention, a servo motor is installed on the guard plate, and the output shaft of the servo motor is fixedly connected to the driving roller of the conveyor belt; and the output shaft of the servo motor is connected to the protection box by power, and the protection box is connected to the defective product protection conveying mechanism and the qualified product protection conveying mechanism by power through the first transmission unit and the second transmission unit respectively;

[0010] As a preferred embodiment of the present invention, a plurality of equally spaced bearings are embedded and installed on the conveyor belt, a column is fixedly passed through the inner ring of the bearing, a turntable and a follower gear are respectively fixed at the upper and lower ends of the column, and a horizontal tooth plate is installed on the frame, and the tooth plate is adapted to the follower gear.

[0011] As a preferred embodiment of the present invention, the defective product protection conveying mechanism includes a defective product spiral conveying cylinder and a spiral conveyor movably installed in the inner cavity thereof, wherein the shaft rod of the spiral conveyor movably passes through the defective product spiral conveying cylinder, and a third follower crown gear is fixedly installed on the top of the shaft rod of the spiral conveyor; the third follower crown gear is power-connected with the first transmission unit.

[0012] As a preferred embodiment of the present invention, a defective product rejection port is opened on the upper part of the side wall of the defective product spiral conveying cylinder, and the defective product rejection port is connected to the guard plate, and the defective product rejection port is aligned with the air nozzle installed on the guard plate.

[0013] In this way, the defective rice dumplings are blown into the defective product removal port through the air nozzle and output by the defective product protection conveying mechanism, which reduces the impact and vibration of the defective rice dumplings and achieves a gentler removal operation.

[0014] As a preferred embodiment of the present invention, the qualified product protection and conveying mechanism includes a qualified product spiral conveying cylinder, wherein the upper part of the side wall of the qualified product spiral conveying cylinder is provided with a qualified product collection inlet connected to the end of the conveyor belt, and the lower part of the side wall of the qualified product spiral conveying cylinder is provided with a qualified product discharge port, wherein the top of the shaft of the screw conveyor installed in the qualified product spiral conveying cylinder is fixedly equipped with a first follower crown gear, and the first follower crown gear is power-connected with the second transmission unit.

[0015] As a preferred embodiment of the present invention, a driving gear is provided in the protection box, the driving gear is fixed to the output shaft of the servo motor, and the driving gear is power-connected with the first transmission unit and the second transmission unit.

[0016] As a preferred embodiment of the present invention, the first transmission unit includes a third transmission rod; the third transmission rod is rotatably connected to the second arm through a bearing, and the second arm is fixed on the guard plate; the second transmission unit includes a second transmission rod, the second transmission rod is rotatably connected to the first arm through a bearing, and the first arm is fixed on the qualified product spiral conveyor cylinder.

[0017] As a preferred embodiment of the present invention, the second transmission gear and the second follower crown gear are respectively installed at both ends of the third transmission rod, wherein the second transmission gear is meshed with the third follower crown gear for transmission, and the second follower crown gear is meshed with the driving gear; the transmission bevel gear and the crown gear are respectively installed at both ends of the second transmission rod, the crown gear is meshed with the driving gear, the transmission bevel gear is meshed with the bevel gear on the first transmission rod, the first transmission rod is installed on the qualified product spiral conveying cylinder through a bearing, and the other end of the first transmission rod is also installed with a first transmission gear, and the first transmission gear is meshed with the first follower crown gear.

[0018] In this way, when the servo motor drives the conveyor belt to operate, it simultaneously drives the screw conveyor in the screw conveyor barrel to transport materials downward through a series of power transmissions, thereby reducing costs and saving space.

[0019] As a preferred embodiment of the present invention, an air pump is also installed on the outer wall of the guard plate, and the air pump is connected to the air nozzle through an air pipeline.

[0020] In the above structure, by obtaining a top view image of the zongzi with the first CCD camera arranged above the conveyor belt, defects at the top corners of the zongzi can be detected. During the operation of the conveyor belt, the follower gear at the bottom of the turntable where the zongzi is placed meshes with the toothed disc of the stand, which drives the turntable to rotate, and the second CCD camera above the conveyor belt side obtains images around the zongzi, thereby detecting defects at other corners of the zongzi, and at the same time, detecting whether the zongzi's binding wire is too loose or falls off.

[0021] Compared with the prior art, the present invention has the following significant advantages:

[0022] (1) The present invention realizes the rotation of the turntable by arranging a turntable on the conveyor belt, and the follower gear at the bottom of the turntable meshes with the gear plate of the stand, thereby providing a full range of viewing angles for the second CCD camera to photograph the rice dumplings, realizing full range of defect detection, and improving the accuracy and comprehensiveness of the quality control of the rice dumplings, thereby increasing the efficiency of the production line and the reliability of the quality of the rice dumplings.

[0023] (2) In the process of the present invention driving the conveyor belt to rotate by the servo motor, the driving gear meshes with the second follower crown gear on the third transmission rod to drive it to rotate, and then drives the third follower crown gear to rotate, and finally achieves the purpose of the screw conveyor of the defective product screw conveyor barrel rotating downward to feed the material, thereby preventing the defective rice dumplings from falling directly into the basket after being removed, resulting in complete damage or aggravated damage, reducing the damage rate of defective products, and also reducing the later remediation costs of defective rice dumplings. Similarly, the qualified product protection and conveying mechanism also plays an effective protective role in the transportation of qualified rice dumplings.

[0024] (3) The present invention realizes non-contact sorting of defective rice dumplings by blowing defective rice dumplings to the defective rice dumpling protection conveying mechanism through an air nozzle, thereby avoiding additional pressure on the defective rice dumplings and improving the sorting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 It is a schematic diagram of the overall top view structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of the defective product spiral conveyor cylinder of the present invention;

[0028] Figure 3 This is a schematic diagram of the cross-sectional structure of a qualified product spiral conveyor cylinder of the present invention;

[0029] Figure 4 This is a side view schematic diagram of the distribution position of the turntable on the conveyor belt of the present invention.

[0030] In the figure: 1. conveyor belt; 2. guard plate; 3. stand; 4. CCD camera; 5. air pump; 6. air nozzle; 7. defective product rejection port; 8. servo motor; 9. qualified product collection entrance; 10. qualified product spiral conveyor cylinder; 11. qualified product discharge port; 12. first follower crown gear; 13. first transmission gear; 14. first transmission rod; 15. transmission bevel gear; 16. first support arm; 17. second transmission rod; 18. driving gear; 19. second follower crown gear; 20. protective box; 21. second support arm; 22. third transmission rod; 23. second transmission gear; 24. defective product discharge port; 25. third follower crown gear; 26. defective product spiral conveyor cylinder; 27. screw conveyor; 28. bearing; 29. ​​turntable; 30. tooth plate; 31. follower gear. DETAILED DESCRIPTION

[0031] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a rice dumpling sorting device with a simple structure and reasonable design, which can obtain detection images of rice dumplings at different angles and facilitate fast and accurate sorting. In order to solve the above problems, the present embodiment provides an automatic rice dumpling sorting device based on visual detection, which is used to detect and remove the appearance defects of rice dumplings, thereby improving the quality and production efficiency of rice dumplings. In order to make the purpose, technical scheme and advantages of the present invention clearer, the specific implementation methods of the present invention will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to illustrate the present invention and do not limit the scope of protection of the present invention.

[0032] See also Figure 1 and Figure 4 An automatic rice dumpling sorting device based on visual detection includes a conveyor belt 1, which is used to transport rice dumplings from one location to another location. The conveyor belt 1 can be driven by a motor to move the rice dumplings along a specific path. Guard plates 2 are provided on both sides of the conveyor belt 1. The function of the guard plates 2 is to prevent the rice dumplings from falling sideways during the transmission process, thereby ensuring the stability and safety of the rice dumplings.

[0033] The stand 3 is fixedly mounted on the guard plate 2 on one side of the conveyor belt 1, and a visual inspection device is installed on the stand 3. The visual inspection device is a key part of the present invention and is used to perform all-round defect detection and analysis on the rice dumplings on the conveyor belt 1. The visual inspection device includes a first CCD camera 4 and a second CCD camera 5. The first CCD camera 4 and the second CCD camera 4 are both used to capture images of rice dumplings and transmit the images to a subsequent image processing system for analysis to obtain the defects of the rice dumplings. The specific models and parameters can be selected according to actual needs. The first CCD camera 4 is located directly above the conveyor belt 1 and is set downward to obtain a top view image of the rice dumplings so as to detect defects at the top corners of the rice dumplings. The second CCD camera 4 is located above the side of the conveyor belt 1 and is set in the direction of the conveyor belt to obtain images of the four sides of the rice dumplings so as to detect defects at other corners of the rice dumplings and whether the binding wire is too loose or falls off.

[0034] Several equally spaced bearings 28 are embedded and installed on the conveyor belt 1. The inner ring of the bearing 28 is fixed with a column. The upper and lower ends of the column are respectively fixed with a turntable 29 and a follower gear 31. The column plays a supporting and fixing role. The turntable 29 is a platform for placing zongzi. The diameter and height of the turntable 29 can be appropriately adjusted according to the size and shape of the zongzi so that the zongzi can be stably placed on the turntable 29. The follower gear 31 is a component used to drive the turntable 29 to rotate. The number and shape of its teeth can be selected according to actual needs. A horizontal tooth plate 30 is installed on the stand 3. The tooth plate 30 is adapted to the follower gear 31 to ensure that effective meshing can be generated when the turntable 29 moves to the front of the stand 3, thereby driving the turntable 29 to rotate. The turntable 29 moves forward with the conveyor belt 1. When the turntable 29 moves to the front of the stand 3, the follower gear 31 at the bottom of the turntable 29 meshes with the horizontal tooth plate 30 installed on the stand 3, and the follower gear 31 is driven to rotate, thereby driving the turntable 29 to rotate. In this way, the first CCD camera 4 and the second CCD camera 4 installed on the stand 3 can detect the rice dumplings on the turntable 29 in all directions, thereby achieving all-round detection and analysis of the rice dumplings and ensuring product quality.

[0035] like Figures 1 to 3 As shown, a defective product protection and conveying mechanism is provided on the outer wall of another guard plate 2 for removing unqualified rice dumplings; a qualified product protection and conveying mechanism is provided at the end of the conveyor belt 1 for collecting qualified rice dumplings.

[0036] A servo motor 8 is installed on the guard plate 2, and the output shaft of the servo motor 8 is fixedly connected to the driving roller of the conveyor belt 1; the output shaft of the servo motor 8 is also power-connected to the protection box 20, and the protection box 20 is power-connected to the defective product protection conveying mechanism and the qualified product protection conveying mechanism through the first transmission unit and the second transmission unit respectively.

[0037] When the conveyor belt 1 is conveying the rice dumplings, the CCD camera 4 performs detection. If defective products are found, when the rice dumplings are transported to the position of the air nozzle 6, the air pump 5 delivers gas to the air nozzle 6 to blow the defective products into the defective product rejection port 7 of the defective product spiral conveying cylinder 26. Because the servo motor 8 drives the conveyor belt 1 to rotate, it also drives the screw conveyor 27 in the defective product spiral conveying cylinder 26 to rotate downward for transportation through the first transmission unit. In this way, defective products can be handled gently and controllably, avoiding the situation where the defective rice dumplings fall directly into the basket after being rejected and cause secondary damage.

[0038] like Figure 1 and Figure 2 As shown, in this embodiment, the first transmission unit includes a third transmission rod 22, the third transmission rod 22 is rotatably connected to the second arm 21 through a bearing, the second arm 21 is fixed on the guard plate 2, and the second transmission gear 23 and the second follower crown gear 19 are respectively installed at both ends of the third transmission rod 22, wherein the second transmission gear 23 is meshed with the third follower crown gear 24 for transmission, and the second follower crown gear 19 is meshed with the driving gear 18, so that the servo motor 8 can transmit power to the defective product protection conveying mechanism through the first transmission unit. The defective product protection conveying mechanism includes a defective product spiral conveying cylinder 26 and a spiral conveyor 27 movably installed inside it. It should be noted that the spiral conveyor 27 is made of a foam plastic board with good shock absorption and protection effects, the shaft of the spiral conveyor 27 movably passes through the defective product spiral conveying cylinder 26, and the third follower crown gear 24 is fixedly installed on the top of the shaft of the spiral conveyor 27, and the third follower crown gear 24 is connected to the power of the first transmission unit, thereby achieving the purpose of driving the spiral conveyor 27 of the defective product spiral conveying cylinder 26 to rotate downward for conveying.

[0039] When the conveyor belt 1 is conveying rice dumplings, they are inspected by the CCD camera 4. If they are qualified products, when the rice dumplings are conveyed to the end of the conveyor belt, they enter the qualified product collection entrance 9 due to inertia. The servo motor automatically drives the screw conveyor of the qualified product screw conveying cylinder 10 through the second transmission unit to rotate and feed the material downward, which effectively protects the qualified products and realizes the safe transportation of qualified products.

[0040] like Figure 1 and Figure 3As shown, in a specific embodiment, the second transmission unit includes a second transmission rod 17, which is rotatably connected to the first arm 16 through a bearing, and the first arm 16 is fixed on the qualified product spiral conveying cylinder 10. The two ends of the second transmission rod 17 are respectively equipped with a transmission bevel gear 15 and a crown gear, and the crown gear is meshed with the driving gear 18. The transmission bevel gear 15 is meshed with the bevel gear on the first transmission rod 14. The first transmission rod 14 is installed on the qualified product spiral conveying cylinder 10 through a bearing, and the other end of the first transmission rod 14 is also equipped with a first transmission gear 13, and the first transmission gear 13 is meshed with the first follower crown gear 12, so that the servo motor transmits power to the qualified product protection and conveying mechanism through the second transmission unit. The qualified product protection and conveying mechanism includes a qualified product spiral conveying cylinder 10, wherein a qualified product collection inlet 9 connected to the end of the conveyor belt 1 is opened at the upper part of the side wall of the qualified product spiral conveying cylinder 10, and a qualified product discharge port 11 is opened at the lower part of the side wall of the qualified product spiral conveying cylinder 10, wherein a first follower crown gear 12 is fixedly installed on the top of the shaft of the screw conveyor installed in the qualified product spiral conveying cylinder 10, and the first follower crown gear 12 is connected to the second transmission unit for power, and finally realizes the purpose of driving the screw conveyor of the qualified product spiral conveying cylinder 10 to rotate and feed downward.

[0041] The implementation principle of the automatic rice dumpling sorting device based on visual detection in this embodiment is as follows: the rice dumplings are placed on the turntable 29 of the conveyor belt 1, and the turntable 29 moves forward with the conveyor belt 1. When the turntable 29 moves to the front of the stand 3, the follower gear 31 at the bottom of the turntable 29 engages with the tooth plate 30. At this time, the turntable 29 will be driven to rotate, so that the rice dumplings can be effectively detected in all directions by the two CCD cameras 4 installed on the stand 3. Two CCD cameras 4 detect whether the rice dumplings are defective. If they are defective, when the defective rice dumplings are transported to the position of the air nozzle 6, the air pump 5 delivers air through the air nozzle 6 to blow the defective products to the defective product rejection port 7 of the defective product spiral conveying cylinder 25. As the servo motor 8 drives the conveyor belt 1 to operate, the second follower crown gear 19 on the third transmission rod 22 is engaged by the driving gear 18 to drive it to rotate, and then the third follower crown gear 24 is driven to rotate, and finally the screw conveyor 26 of the defective spiral conveying cylinder 25 is rotated to feed the materials downward, thereby avoiding the current situation where the defective rice dumplings fall directly into the basket and are completely damaged after being rejected. If it is a qualified product, when the qualified rice dumplings are transported to the end of the conveyor belt 1, due to inertia, they enter the qualified product collection entrance 9, and the driving gear 18 engages with the second follower crown gear 19 on the second transmission rod 17 to drive it to rotate, and then drives the first follower crown gear 12 to rotate, and finally achieves the purpose of the screw conveyor of the qualified product screw conveyor cylinder 10 rotating downward to feed the material. Through the above process, the device realizes the intelligent sorting and processing of rice dumplings, ensures the effective separation of defective products and qualified products, avoids the occurrence of secondary damage, and improves production efficiency and product quality.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic sorting device for rice dumplings based on visual detection, comprising a conveyor belt, characterized in that: Guard plates are provided on both sides of the conveyor belt; A stand is installed on one of the guard plates, and a visual inspection device is installed on the stand, wherein the visual inspection device includes a first CCD camera and a second CCD camera, wherein the first CCD camera is located directly above the conveyor belt and is arranged downward, and is used to obtain a top view image of the zongzi; the second CCD camera is located above the side of the conveyor belt and is arranged in the direction of the conveyor belt, and is used to obtain a surrounding image of the zongzi; The outer wall of the other guard plate is provided with a defective product protection and conveying mechanism for removing and conveying the detected defective rice dumplings; A qualified product protection and conveying mechanism is provided at the end of the conveyor belt for collecting and conveying the detected qualified rice dumplings.

2. According to claim 1, a visual detection-based automatic sorting device for rice dumplings is characterized in that: A servo motor is installed on the guard plate, and the output shaft of the servo motor is fixed and passes through the driving roller of the conveyor belt; and the output shaft of the servo motor is connected to the protection box by power, and the protection box is connected to the defective product protection conveying mechanism and the qualified product protection conveying mechanism by power through the first transmission unit and the second transmission unit respectively.

3. The automatic sorting device for rice dumplings based on visual detection according to claim 2 is characterized in that: A driving gear is arranged in the protection box, the driving gear is fixed to the output shaft of the servo motor, and the driving gear is respectively connected with the first transmission unit and the second transmission unit in terms of power.

4. The automatic sorting device for rice dumplings based on visual detection according to claim 3 is characterized in that: The conveyor belt is embedded with a number of equally spaced bearings, the inner ring of the bearing is fixed with a column, the upper and lower ends of the column are respectively fixed with a turntable and a follower gear, and the stand is installed with a horizontal toothed plate, which is adapted to the follower gear.

5. The automatic sorting device for rice dumplings based on visual detection according to claim 4 is characterized in that: The defective product protection and conveying mechanism includes a defective product spiral conveying cylinder and a spiral conveyor movably installed in its inner cavity, wherein the shaft of the spiral conveyor movably passes through the defective product spiral conveying cylinder, and a third follower crown gear is fixedly installed on the top of the shaft of the spiral conveyor; the third follower crown gear is power-connected with the first transmission unit.

6. The automatic sorting device for rice dumplings based on visual detection according to claim 5 is characterized in that: A defective product rejection port is provided on the upper part of the side wall of the defective product spiral conveying cylinder, and the defective product rejection port is communicated with the guard plate, and the defective product rejection port is aligned with the air jet nozzle installed on the guard plate.

7. The automatic rice dumpling sorting device based on visual detection according to claim 6 is characterized in that: An air pump is also installed on the outer wall of the guard plate, and the air pump is connected with the air nozzle through an air transmission pipeline.

8. The automatic rice dumpling sorting device based on visual detection according to claim 5 is characterized in that: The qualified product protection and conveying mechanism includes a qualified product spiral conveying cylinder, wherein the upper part of the side wall of the qualified product spiral conveying cylinder is provided with a qualified product collection inlet connected to the end of the conveyor belt, and the lower part of the side wall of the qualified product spiral conveying cylinder is provided with a qualified product discharge port, wherein the first follower crown gear is fixedly installed on the top of the shaft rod of the screw conveyor installed in the qualified product spiral conveying cylinder, and the first follower crown gear is power-connected with the second transmission unit.

9. The automatic rice dumpling sorting device based on visual detection according to claim 8 is characterized in that: The first transmission unit includes a third transmission rod; the third transmission rod is rotatably connected to the second arm through a bearing, and the second arm is fixed on the guard plate; the second transmission unit includes a second transmission rod, the second transmission rod is rotatably connected to the first arm through a bearing, and the first arm is fixed on the qualified product protection conveying mechanism.

10. The automatic rice dumpling sorting device based on visual detection according to claim 9 is characterized in that: The second transmission gear and the second follower crown gear are respectively installed at both ends of the third transmission rod, wherein the second transmission gear is meshed with the third follower crown gear for transmission, and the second follower crown gear is meshed with the driving gear; the transmission bevel gear and the crown gear are respectively installed at both ends of the second transmission rod, the crown gear is meshed with the driving gear, and the transmission bevel gear is meshed with the bevel gear on the first transmission rod, the first transmission rod is installed on the qualified product spiral conveying cylinder through a bearing, and the other end of the first transmission rod is also installed with the first transmission gear, and the first transmission gear is meshed with the first follower crown gear.

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