A foreign matter screening device for a quick-frozen fruit and vegetable conveying line

Abstract

The present application relates to fruit and vegetable foreign matter screening technical field, specifically, it relates to a kind of foreign matter screening device for quick-frozen fruit and vegetable conveying line, including conveying mechanism, the side of conveying mechanism is provided with screening mechanism, and dust removal mechanism is installed on the screening mechanism;The conveying mechanism includes base, and the upper end of the base is fixedly installed with several supporting legs, the upper end of the supporting leg is fixedly installed with plate frame, the plate frame is provided with conveyor belt, and the one end of the plate frame is fixedly installed with discharging slope table, and the upper end of the discharging slope table is fixedly provided with several partition plates.The present application forms independent material passage by multiple partition plates on discharging slope table, so that fruit and vegetable are smoothly slid along slope under the action of gravity and keep single column orderly conveying, industrial camera carries out image acquisition corresponding to each passage, whether mixed with foreign matter or appearance defect exists in fruit and vegetable is judged by image recognition algorithm, and the detection process is continuous and efficient, avoids missed detection caused by material stacking.

Description

Technical Field

[0001] This invention relates to the field of foreign object screening technology for fruits and vegetables, and more specifically, to a foreign object screening device for quick-frozen fruit and vegetable conveyor lines. Background Technology

[0002] In the production of quick-frozen fruits and vegetables, raw materials often have problems such as uneven size and specifications, abnormal color, and mold defects. If these defects cannot be effectively screened and removed, it will not only cause inconsistent quality of finished products and reduce product grade, but also pose food safety risks and seriously affect the standardized production of products and market quality reputation.

[0003] Currently, traditional screening methods in the industry have obvious shortcomings. Conventional mechanical equipment can only complete simple size classification and cannot identify color defects. Manual visual screening is labor-intensive, inefficient, and easily affected by human factors, resulting in a high rate of missed and false detections, which makes it difficult to meet the needs of modern high-standard production.

[0004] Meanwhile, material accumulation and dust generation are common during material conveying and screening. Debris and dust adhering to the material surface can obscure the lens, causing blurry images and reduced recognition accuracy of industrial cameras. Furthermore, material accumulation can conceal defective products, further increasing the rate of missed detections. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a foreign object screening device for quick-frozen fruit and vegetable conveying lines. It features advantages such as automatic identification by industrial cameras, precise removal by ejector cylinders, uniform material conveying by partition plates, and negative pressure dust removal. This device can solve the problems of low efficiency, high missed detection rate, and dust pollution associated with existing manual sorting methods.

[0006] The present invention provides a foreign object screening device for a quick-frozen fruit and vegetable conveying line, including a conveying mechanism, a screening mechanism is provided on one side of the conveying mechanism, and a dust removal mechanism is installed on the screening mechanism; The conveying mechanism includes a base, a plurality of support legs are fixedly installed on the upper end of the base, a plate frame is fixedly installed on the upper end of the support legs, a conveyor belt is provided on the plate frame, a discharge ramp is fixedly installed on one end of the plate frame, a plurality of partition plates are distributed and fixed on the upper end of the discharge ramp, the other end of the partition plates is fixed to the upper end face of the plate frame, and the gap between the lower end of the partition plate and the upper end of the conveyor belt does not exceed two centimeters. The screening mechanism includes a cover fixed to the surface of the base and covering the top of the discharge ramp. One side of the cover has a feed inlet and a waste outlet, and the other side has a discharge outlet. A light source is fixedly installed on the upper inner wall of the cover. A separation ramp is fixedly installed on the upper part of the base. A waste discharge ramp is provided on one side of the separation ramp, and side plates are symmetrically installed on the waste discharge ramp. A discharge ramp is provided on the other side of the separation ramp, penetrating the waste outlet. The conveyor belt penetrates the feed inlet, and the discharge ramp is positioned to match the discharge outlet.

[0007] Preferably, several linkage bearings are symmetrically embedded and installed on both sides of the plate frame, and a linkage shaft is interference-fitted onto the inner ring wall of the linkage bearing, and a linkage roller is fixedly sleeved on the surface of the linkage shaft.

[0008] Preferably, a drive bearing is symmetrically fixed at one end of the plate frame, and a drive shaft is interference-fitted onto the inner ring wall of the drive bearing. A motor is fixedly installed at the outer end of the plate frame via a bracket. The motor has a drive shaft inside, and the end of the shaft is connected to the end of the drive shaft via a coupling. A drive roller is fixedly sleeved on the surface of the drive shaft.

[0009] Preferably, the surface of the drive roller is covered by a conveyor belt, and the drive roller is driven by a plurality of linkage rollers via the conveyor belt.

[0010] Preferably, a central plate is also fixedly installed on the inner wall of the cover. Several industrial cameras are fixedly distributed on one side of the central plate. The positions of the industrial cameras correspond to the positions of the unloading ramp. Several ejection cylinders are fixedly distributed on one side of the central plate. The ejection cylinders are equipped with piston rods for extension and retraction, and the ends of the piston rods are fixedly installed with ejection heads for pushing non-compliant fruits and vegetables.

[0011] Preferably, a plurality of collars are fixedly distributed on the upper end of the center plate, and a threaded post is fixedly installed on the inner wall of the cover. The threaded post and the collar are connected through each other. A threaded cap is threadedly installed at the end of the threaded post, and one end of the threaded cap is tightly attached to the end face of the collar.

[0012] Preferably, the dust removal mechanism includes a dust collection hood and an air pump. The dust collection hood is fixed in the middle of the center plate. A grid is embedded in the opening of the dust collection hood near the unloading slope. A dust collection interface is embedded in the back of the dust collection hood.

[0013] Preferably, a sleeve is embedded on one side of the cover, and a transition pipe is sleeved inside the sleeve. One end of the transition pipe is connected to the dust collection interface via a flange. An air pump is fixedly installed on the outer wall of the cover via a bracket, and the air inlet section of the air pump is connected to the transition pipe via a flange.

[0014] Preferably, the air pump's outlet end is covered with a dust collection cylinder, and a dust collection bag is embedded inside the dust collection cylinder. The dust collection bag is a non-woven mesh bag.

[0015] Preferably, positioning sleeves are symmetrically fixed on both sides of the air outlet end of the air pump, and positioning pins are slidably sleeved inside the positioning sleeves. A spring is wound around the surface of the positioning pin, and the two ends of the spring are fixedly installed to the end face of the positioning sleeve and the end of the positioning pin, respectively. A positioning seat is fixedly installed on the surface of the dust collection cylinder, and the end of the positioning pin away from the spring is inserted and connected to the inside of the positioning seat.

[0016] The targeted solution provided by this invention has the following beneficial effects: 1. This invention forms independent material channels through multiple partitions on the feeding ramp, allowing fruits and vegetables to slide smoothly down the ramp under gravity and maintain a single-row orderly conveying. An industrial camera collects images for each channel, and an image recognition algorithm determines whether the fruits and vegetables contain foreign objects or have appearance defects. The detection process is continuous and efficient, avoiding missed detections caused by material stacking. 2. This invention uses a ejector cylinder to drive a flexible rubber ejector head to push unqualified fruits and vegetables away from the material channel when they are detected. The unqualified fruits and vegetables are discharged from the waste outlet via the waste discharge slope. The flexible ejector head avoids mechanical damage to the fruits and vegetables. Qualified fruits and vegetables continue to be output from the discharge outlet along the discharge slope, realizing the automatic removal and classification collection of foreign objects and defective products. 3. This invention uses an air pump to generate negative pressure inside the dust collection hood, which draws the dust and debris generated during the screening process into the dust collection hood through the grid and transports it into the dust collection cylinder, where it is intercepted and collected by the dust collection bag. The grid prevents fruits and vegetables from being sucked in, and clean air is discharged from the gaps in the bag. The positioning pin automatically inserts into the positioning seat under the action of the spring to lock the dust collection cylinder. Pulling the positioning pin allows the dust collection cylinder to be quickly removed for cleaning the bag, making maintenance convenient. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the distribution of various mechanisms provided in the embodiments of the present invention; Figure 2 A schematic diagram of the overall front structure provided for an embodiment of the present invention; Figure 3 A schematic diagram of the overall side structure provided for an embodiment of the present invention; Figure 4 A schematic diagram of the internal cross-section of the cover provided for an embodiment of the present invention; Figure 5 A front view of the center plate provided for an embodiment of the present invention; Figure 6 A schematic diagram of the back of the center plate provided for an embodiment of the present invention; Figure 7 This is a schematic diagram of the installation of the air pump and dust collection cylinder provided for an embodiment of the present invention.

[0019] In the diagram: 1. Conveying mechanism; 10. Base; 11. Support leg; 12. Plate frame; 13. Linkage bearing; 14. Linkage shaft; 15. Linkage roller; 16. Drive bearing; 17. Drive roller; 18. Motor; 19. Conveyor belt; 1001. Discharge ramp; 1002. Separator plate; 110. Drive shaft. 2. Screening mechanism; 20. Cover; 21. Feed inlet; 22. Waste outlet; 23. Discharge outlet; 24. Light source; 25. Separation slope; 26. Waste discharge slope; 27. Side plate; 28. Discharge slope; 2001. Center plate; 2002. Industrial camera; 2003. Collar; 2004. Threaded column; 2005. Threaded cap; 2006. Ejector cylinder; 2007. Ejector head; 3. Dust removal mechanism; 30. Dust collection hood; 31. Grille; 32. Pipe sleeve; 33. Transition pipe; 34. Air pump; 35. Dust collection cylinder; 36. Dust collection bag; 37. Dust collection interface; 3001. Positioning sleeve; 3002. Positioning pin; 3003. Spring; 3004. Positioning seat. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example Reference Figures 1-7The present invention provides a technical solution: a foreign object screening device for a quick-frozen fruit and vegetable conveying line, including a conveying mechanism 1, a screening mechanism 2 is provided on one side of the conveying mechanism 1, and a dust removal mechanism 3 is installed on the screening mechanism 2. The conveying mechanism 1 is used to continuously convey quick-frozen fruits and vegetables to the detection area of ​​the screening mechanism 2, the screening mechanism 2 is used to perform image recognition and foreign object removal on the fruits and vegetables, and the dust removal mechanism 3 is used to collect dust and debris generated during the screening process. The conveying mechanism 1 includes a base 10, which is a rectangular flat plate structure made of stainless steel, providing good load-bearing capacity and corrosion resistance. Several support legs 11 are fixedly installed on the upper end of the base 10. Each support leg 11 is a vertical support column, spaced apart along the length of the base 10. A frame 12 is fixedly installed on the upper end of each support leg 11. The frame 12 is a rectangular frame structure, forming the main support of the conveying mechanism 1. A conveyor belt 19 is installed on the frame 12. The conveyor belt 19 is a circular conveyor belt made of food-grade PU or PVC material, with a smooth and flat surface, facilitating stable transport and subsequent cleaning of fruits and vegetables. A discharge ramp 1001 is fixedly installed at one end of the frame 12. The feeding ramp 1001 is an inclined sliding platform with a smooth surface, allowing fruits and vegetables to slide smoothly down the ramp to the detection area under gravity. Several partition plates 1002 are fixedly distributed on the upper end of the feeding ramp 1001. The partition plates 1002 are vertical plates and are spaced apart along the width direction of the feeding ramp 1001. An independent material channel is formed between adjacent partition plates 1002. The other end of the partition plate 1002 is fixed to the upper end face of the plate frame 12. The gap between the lower end of the partition plate 1002 and the upper end of the conveyor belt 19 is no more than two centimeters. This gap ensures the normal operation of the conveyor belt 19 and effectively prevents fruits and vegetables from running out of the path or piling up below the partition plate 1002.

[0022] Several linkage bearings 13 are symmetrically embedded on both sides of the plate frame 12. The linkage bearings 13 are rolling bearings. A linkage shaft 14 is interference-fitted on the inner ring wall of the linkage bearing 13. A linkage roller 15 is fixedly sleeved on the surface of the linkage shaft 14. Multiple linkage rollers 15 are distributed at intervals along the length of the plate frame 12 to provide support and tension for the conveyor belt 19.

[0023] One end of the plate frame 12 is symmetrically fixed with a drive bearing 16, which is a rolling bearing. A drive shaft 110 is interference-fitted onto the inner ring wall of the drive bearing 16. The outer end of the plate frame 12 is fixedly mounted with a motor 18, which is a geared motor. Its output speed can be adjusted according to the conveying speed requirements of the production line. The motor 18 has a drive shaft inside, and the end of the shaft is connected to the end of the drive shaft 110 via a coupling. A drive roller 17 is fixedly sleeved on the surface of the drive shaft 110. A conveyor belt 19 passes over the surface of the drive roller 17. The drive roller 17 is connected to several linkage rollers 15 via the conveyor belt 19. When the motor 18 is powered on, it drives the drive shaft 110 and the drive roller 17 to rotate. The drive roller 17 drives each linkage roller 15 to rotate synchronously via the conveyor belt 19. The conveyor belt 19 circulates.

[0024] The screening mechanism 2 includes a cover 20, which is fixed to the surface of the base 10 and covers the top of the unloading ramp 1001, forming a closed detection space to prevent external light and dust from interfering with the detection process. One side of the cover 20 has an inlet 21 and a waste outlet 22. The inlet 21 allows the conveyor belt 19 and fruits and vegetables to pass through, while the waste outlet 22 allows unqualified fruits and vegetables to be discharged. The other side of the cover 20 also has an outlet 23 for qualified fruits and vegetables to be output. Light sources 24, which are LED strip lights, are fixedly installed on the upper inner wall of the cover 20 and are symmetrically mounted on the cover. The inner walls of the 20 provide stable and uniform lighting for the detection area, ensuring that the images captured by the industrial camera 2002 are clear and consistent. A separation slope 25 is fixedly installed on the upper end of the base 10. A waste discharge slope 26 is provided on one side of the separation slope 25. Side plates 27 are symmetrically installed on the waste discharge slope 26 to prevent unqualified fruits and vegetables from falling from both sides of the slope during the waste discharge process. A discharge slope 28 is provided on the other side of the separation slope 25. The waste discharge slope 26 passes through the waste inlet 22, and the conveyor belt 19 passes through the feed inlet 21. The positions of the discharge slope 28 and the discharge inlet 23 are matched.

[0025] The inner wall of the cover 20 is also fixedly installed with a central plate 2001. The central plate 2001 is a horizontal plate that spans across the top of the unloading ramp 1001. Several industrial cameras 2002 are fixedly distributed on one side of the central plate 2001. The positions of the industrial cameras 2002 correspond to the positions of the unloading ramp 1001, that is, each industrial camera 2002 corresponds to a material channel formed by the partition plate 1002. The industrial cameras 2002 are high-resolution industrial cameras that can quickly scan the fruits and vegetables passing below them. The system enables fast and clear image acquisition, and uses image recognition algorithms to determine whether fruits and vegetables contain foreign objects or have appearance defects. Several ejection cylinders 2006 are fixedly distributed on one side of the central plate 2001. Each ejection cylinder 2006 corresponds to an industrial camera 2002. The ejection cylinder 2006 has a piston rod for extension and retraction, and the end of the piston rod is fixedly installed with an ejection head 2007 for pushing non-compliant fruits and vegetables. The ejection head 2007 is a flexible rubber head to avoid mechanical damage to the fruits and vegetables when pushing them.

[0026] The center plate 2001 has several collars 2003 fixedly distributed on its upper end. The inner wall of the cover 20 is fixedly installed with threaded post 2004. The threaded post 2004 and the collar 2003 are connected through each other. The end of the threaded post 2004 is threaded with a threaded cap 2005. One end of the threaded cap 2005 is tightly attached to the end face of the collar 2003. After loosening the threaded cap 2005, the center plate 2001 can be detachably installed with the inner top of the cover 20, which facilitates the disassembly and maintenance of some parts of the center plate 2001.

[0027] The dust removal mechanism 3 includes a dust collection hood 30 and an air pump 34. The dust collection hood 30 is fixed in the middle of the center plate 2001 and is located between each industrial camera 2002 and the ejector cylinder 2006. A grid 31 is embedded in the opening of the dust collection hood 30 near the unloading ramp 1001. The grid 31 is a grid plate with several through holes, which allows the dust-laden airflow to pass through while preventing fruits and vegetables from being sucked in. A dust collection interface 37 is embedded in and fixed on the back of the dust collection hood 30.

[0028] The hood 20 has a sleeve 32 embedded on one side, and a transition pipe 33 is fitted inside the sleeve 32. One end of the transition pipe 33 is connected to the dust collection interface 37 via a flange. An air pump 34 is fixedly installed on the outer wall of the hood 20 via a bracket. The air inlet section of the air pump 34 is connected to the transition pipe 33 via a flange. After the air pump 34 is started, a negative pressure is generated inside the dust collection hood 30, which draws the dust and debris generated during the screening process into the dust collection hood 30 through the grid 31, and then transports it to the air pump 34 through the dust collection interface 37 and the transition pipe 33.

[0029] The air pump 34 is covered with a dust collection cylinder 35. A dust collection bag 36 is embedded inside the dust collection cylinder 35. The dust collection bag 36 is a non-woven mesh bag. After the dust-laden airflow enters the dust collection cylinder 35, the dust and debris are intercepted and collected inside the dust collection bag 36, and the clean air is discharged from the pores of the dust collection bag 36.

[0030] The air pump 34 has symmetrically fixed positioning sleeves 3001 on both sides of its air outlet end. Positioning pins 3002 are slidably connected inside the positioning sleeves 3001. Springs 3003 are wound around the surface of the positioning pins 3002. The two ends of the springs 3003 are fixedly installed to the end face of the positioning sleeves 3001 and the end of the positioning pins 3002, respectively. Positioning seats 3004 are fixedly installed on the surface of the dust collection cylinder 35. The end of the positioning pins 3002 away from the springs 3003 is inserted and connected to the inside of the positioning seats 3004, locking the dust collection cylinder 35 at the air outlet end of the air pump 34. When it is necessary to clean the dust collection bag 36, the positioning pins 3002 are pulled outward to overcome the elastic force of the springs 3003 and disengage from the positioning seats 3004, so that the dust collection cylinder 35 can be removed from the air outlet end of the air pump 34.

[0031] In practice When in use, after the motor 18 is powered on, it drives the drive shaft 110 to rotate under the support of the drive bearing 16 through the coupling. The drive roller 17, which is fixedly sleeved on the surface of the drive shaft 110, rotates synchronously. The drive roller 17 is connected to multiple linkage rollers 15 through the annular conveyor belt 19. The conveyor belt 19 circulates and continuously transports the quick-frozen fruits and vegetables forward. The feeding ramp 1001 fixed at one end of the plate frame 12 is an inclined slide. Under the action of gravity, the fruits and vegetables slide smoothly down the ramp to the detection area. Multiple partition plates 1002 distributed on the upper end of the feeding ramp 1001 are arranged at intervals along the width direction. An independent material channel is formed between adjacent partition plates 1002. The gap between the lower end of the partition plate 1002 and the upper end of the conveyor belt 19 does not exceed two centimeters, which not only ensures the normal operation of the conveyor belt 19, but also effectively prevents the fruits and vegetables from running around or piling up under the partition plate 1002, ensuring that the fruits and vegetables enter the detection area in a single and orderly manner. A central plate 2001 fixed to the inner wall of the cover 20 spans across the unloading ramp 1001. Multiple industrial cameras 2002 distributed on one side of the central plate 2001 correspond one-to-one with the material channel formed by the partition plate 1002. The light source 24 provides stable and uniform lighting for the detection area, ensuring that the images captured by the industrial cameras 2002 are clear and consistent. The industrial cameras 2002 quickly capture images of the fruits and vegetables passing below them and use image recognition algorithms to determine whether there are foreign objects or appearance defects in the fruits and vegetables. When non-compliant fruits and vegetables are detected, the ejector cylinder 2006 corresponding to the channel is activated instantly. The flexible rubber ejector head 2007 at the end of its piston rod pushes the non-compliant fruits and vegetables away from the conveyor belt 19 and discharges them along the waste discharge slope 26 of the separation ramp 25 through the waste outlet 22. Qualified fruits and vegetables continue to be output along the discharge slope 28 through the discharge outlet 23. The dust collection hood 30 is fixed in the middle of the center plate 2001, between the industrial cameras 2002 and the ejector cylinder 2006. A grid 31 embedded in the opening near the unloading ramp 1001 allows dust-laden airflow to pass through while preventing fruits and vegetables from being sucked in. After the air pump 34 starts, a negative pressure is generated inside the dust collection hood 30. Dust and debris generated during the screening process are drawn into the dust collection hood 30 along with the airflow through the grid 31, and then transported to the dust collection port 37 and transition pipe 33. Air pump 34, dust-laden airflow enters dust collection cylinder 35 from the air outlet of air pump 34. When passing through dust collection bag 36, dust and debris are intercepted and collected inside the bag by non-woven fabric mesh bag. Clean air is discharged from the pores of dust collection bag 36. Dust collection cylinder 35 is locked to air pump 34 air outlet by positioning pin 3002 and positioning seat 3004. Pulling positioning pin 3002 outward overcomes the elastic force of spring 3003 and disengages from positioning seat 3004 to remove dust collection cylinder 35 and clean dust collection bag 36. The threaded post 2004, fixedly installed on the inner wall of the cover 20, passes through the collar 2003, which is distributed and fixed at the upper end of the center plate 2001. The threaded cap 2005, which is threaded at the end of the threaded post 2004, is tightened and its end is in close contact with the end face of the collar 2003, locking the center plate 2001 inside the top of the cover 20. The industrial camera 2002 and the ejector cylinder 2006 installed on the center plate 2001 are positioned together with the center plate 2001. When it is necessary to repair or replace the parts on the center plate 2001, the center plate 2001 can be removed from the threaded post 2004 by loosening the threaded cap 2005, which facilitates the disassembly and repair of the industrial camera 2002 and the ejector cylinder 2006. During installation, the collar 2003 is put into the threaded post 2004 and the threaded cap 2005 is tightened to complete the fixation. No special tools are required, the operation is simple and quick, and the equipment maintenance efficiency is effectively improved.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A foreign object screening device for a quick-frozen fruit and vegetable conveying line, comprising a conveying mechanism (1), characterized in that: A screening mechanism (2) is provided on one side of the conveying mechanism (1), and a dust removal mechanism (3) is installed on the screening mechanism (2). The conveying mechanism (1) includes a base (10), a plurality of support legs (11) are fixedly installed on the upper end of the base (10), a plate frame (12) is fixedly installed on the upper end of the support legs (11), a conveyor belt (19) is provided on the plate frame (12), a discharge ramp (1001) is fixedly installed on one end of the plate frame (12), a plurality of partition plates (1002) are distributed and fixed on the upper end of the discharge ramp (1001), and the other end of the partition plate (1002) is fixed to the upper end surface of the plate frame (12). The gap between the lower end of the partition plate (1002) and the upper end of the conveyor belt (19) does not exceed two centimeters. The screening mechanism (2) includes a cover (20), which is fixed to the surface of the base (10). The cover (20) covers the top of the discharge ramp (1001). A feed inlet (21) and a waste outlet (22) are respectively opened on one side of the cover (20), and a discharge outlet (23) is also opened on the other side of the cover (20). A light source lamp (24) is fixedly installed on the upper end of the inner wall of the cover (20). The upper end of the base (10) A separation ramp (25) is fixedly installed. A waste discharge ramp (26) is provided on one side of the separation ramp (25). Side plates (27) are symmetrically installed on the waste discharge ramp (26). A discharge ramp (28) is provided on the other side of the separation ramp (25). The waste discharge ramp (26) is set through the waste inlet (22). The conveyor belt (19) is set through the feed inlet (21). The discharge ramp (28) is set to fit the position of the discharge inlet (23).

2. The foreign object screening device for a quick-frozen fruit and vegetable conveyor line according to claim 1, characterized in that: Several linkage bearings (13) are symmetrically embedded on both sides of the plate frame (12). A linkage shaft (14) is interference-fitted on the inner ring wall of the linkage bearing (13). A linkage roller (15) is fixedly sleeved on the surface of the linkage shaft (14).

3. The foreign object screening device for a quick-frozen fruit and vegetable conveyor line according to claim 2, characterized in that: One end of the plate frame (12) is symmetrically fixed with a drive bearing (16). The inner ring wall of the drive bearing (16) is fitted with a drive shaft (110). The outer end of the plate frame (12) is fixedly mounted with a motor (18) by a bracket. The motor (18) is provided with a drive shaft inside. The end of the drive shaft and the end of the drive shaft (110) are connected by a coupling. The surface of the drive shaft (110) is fixedly sleeved with a drive roller (17).

4. The foreign object screening device for a quick-frozen fruit and vegetable conveyor line according to claim 3, characterized in that: The surface of the drive roller (17) is covered by a conveyor belt (19), and the drive roller (17) is connected to several linkage rollers (15) via the conveyor belt (19).

5. A foreign object screening device for a quick-frozen fruit and vegetable conveyor line according to claim 1, characterized in that: A central plate (2001) is also fixedly installed on the inner wall of the cover (20). Several industrial cameras (2002) are fixedly distributed on one side of the central plate (2001). The positions of the industrial cameras (2002) correspond to the positions of the unloading ramp (1001). Several ejection cylinders (2006) are fixedly distributed on one side of the central plate (2001). The ejection cylinders (2006) are equipped with piston rods for extension and retraction inside, and ejection heads (2007) for pushing non-compliant fruits and vegetables are fixedly installed at the end of the piston rods.

6. A foreign object screening device for a quick-frozen fruit and vegetable conveyor line according to claim 5, characterized in that: Several collars (2003) are fixedly distributed on the upper end of the center plate (2001). A threaded post (2004) is fixedly installed on the inner wall of the cover (20). The threaded post (2004) and the collar (2003) are connected through each other. A threaded cap (2005) is threadedly installed at the end of the threaded post (2004). One end of the threaded cap (2005) is tightly attached to the end face of the collar (2003).

7. A foreign object screening device for a quick-frozen fruit and vegetable conveyor line according to claim 6, characterized in that: The dust removal mechanism (3) includes a dust collection hood (30) and an air pump (34). The dust collection hood (30) is fixed in the middle of the center plate (2001). A grid (31) is embedded in the opening of the dust collection hood (30) near the unloading ramp (1001). A dust collection interface (37) is embedded in the back of the dust collection hood (30).

8. A foreign object screening device for a quick-frozen fruit and vegetable conveyor line according to claim 7, characterized in that: A sleeve (32) is embedded in one side of the cover (20), and a transition pipe (33) is sleeved inside the sleeve (32). One end of the transition pipe (33) is connected to the dust collection interface (37) by a flange. An air pump (34) is fixedly installed on the outer wall of the cover (20) by a bracket. The air inlet section of the air pump (34) is connected to the transition pipe (33) by a flange.

9. A foreign object screening device for a quick-frozen fruit and vegetable conveyor line according to claim 8, characterized in that: The air pump (34) has a dust collection cylinder (35) covering its outlet end. A dust collection bag (36) is embedded inside the dust collection cylinder (35). The dust collection bag (36) is a non-woven mesh bag.

10. A foreign object screening device for a quick-frozen fruit and vegetable conveyor line according to claim 9, characterized in that: The air pump (34) has symmetrically fixed positioning sleeves (3001) on both sides of the air outlet end. The positioning sleeve (3001) has a slidably fitted positioning pin (3002) inside. The surface of the positioning pin (3002) is wound with a spring (3003). The two ends of the spring (3003) are fixedly installed with the end face of the positioning sleeve (3001) and the end of the positioning pin (3002) respectively. The surface of the dust collection cylinder (35) is fixedly installed with a positioning seat (3004). The end of the positioning pin (3002) away from the spring (3003) is inserted and connected to the inside of the positioning seat (3004).

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