Material screening device and screening method thereof

Abstract

The present invention provides a material screening device and a screening method thereof, belonging to the technical field of material screening, the material screening device comprises a frame, a drum screen and a driving assembly, the drum wall of the drum screen is provided with multiple levels of first sieve holes with different apertures to form a multi-level screening area, an auxiliary screener is fixedly installed in the screening area, the auxiliary screener comprises an arc plate, a screening plate and a connecting plate connected in sequence; the screening plate is provided with multiple levels of second sieve holes, the apertures of the first sieve holes and the second sieve holes in the same level screening area are equal; an inner drum is installed in the drum screen, a top plate is fixedly installed on the inner drum, and the top plate can contact the connecting plate. The screening plate of the present invention increases the screening area of ​​the screening area, and the material in the sieve hole of this level that cannot pass through the first sieve hole can pass through the second sieve hole of the screening plate, thereby improving the screening accuracy, and the screening plate can be deformed, which is beneficial to reduce the blockage of the second sieve hole by the material, and is also beneficial to the dispersion of the material contacting the screening plate.

Description

Technical Field

[0001] The invention relates to the technical field of material screening, and in particular to a material screening device and a screening method thereof. Background Art

[0002] Garlic, as a common condiment, not only adds flavor to food, but also has multiple functions and nutritional values. Garlic screening is a link in the garlic planting and processing process, and garlic is graded according to size, quality, etc. In the prior art, a multi-stage drum screen is usually used to perform multi-stage screening of garlic.

[0003] For example, the patent application document with publication number CN116984250A discloses a garlic grading and screening machine, including a barrel, a sieve plate is fixedly connected to the outlet position of the lower end of the barrel, a sorting mechanism is arranged on the right side of the sieve plate, the sorting mechanism includes a support, a bottom frame, a top frame and a sieve cylinder, the apertures of the three sieve cylinders are increased successively, so that garlics of different sizes can be sorted. For another example, the patent application document with publication number CN115069556A discloses a garlic screening device with a garlic skin collection function, including a support table, a pretreatment mechanism, a cleaning mechanism and a screening mechanism, the screening mechanism includes a sieve cage, the front end of the sieve cage is tilted downward, and the outer side surface of the sieve cage is provided with three groups of circular holes at equal intervals, each group of circular holes is of the same size, and the three groups of circular holes of the sieve cage are reduced successively from front to back, and three inclined shells for catching fallen garlic are embedded at equal intervals on the support table.

[0004] Both of the above screening devices use a drum screen to drive the garlic to move continuously. The garlic gathers at the bottom of the drum screen and relies on gravity to pass through the screen holes of the drum screen and fall onto the inclined shell. Due to the different sizes of the screen holes, the garlic can be graded and screened. However, since the garlic moves in an arc along the inner wall of the drum screen in the drum screen, in general, the garlic at the bottom of the drum screen can pass through the screen holes vertically, while the garlic deviating from the bottom of the drum screen is not easy to pass through the screen holes, causing this part of the garlic to continue to move forward and may pass through the larger screen holes in front of the drum screen, thereby affecting the accuracy of garlic screening. Therefore, it is necessary to develop a material screening device and a screening method thereof to solve the technical problem in the prior art that the garlic deviating from the bottom of the drum screen and that can pass through the screen holes of this level is not easy to pass through the screen holes of this level, thereby causing inaccurate garlic screening. Summary of the invention

[0005] In view of this, the present invention provides a material screening device and a screening method thereof, which solves the technical problem that materials deviating from the bottom end of the drum screen and capable of passing through the sieve holes of this level are difficult to pass through the sieve holes of this level by increasing the effective screening area.

[0006] In order to solve the above technical problems, on the one hand, the present invention provides a material screening device, comprising a frame, a drum screen arranged on the frame and a driving assembly for driving the drum screen to rotate, the drum screen is provided with a plurality of first sieve holes of different apertures on the drum wall to form a multi-stage screening area, one end of the drum screen is a material inlet, and the lower end of the drum screen is provided with a material guide for receiving the material falling from the first sieve hole, and an auxiliary screener is fixedly installed in the screening area, and the auxiliary screener comprises an arc plate, a screening plate and a connecting plate connected in sequence; the arc plate is inscribed with the inner wall of the drum screen and is tightly attached to the inner wall of the drum screen, along the rotation direction of the drum screen, the arc plate has a first end and a second end, the screening plate is fixedly connected to the first end, and the connecting plate is connected between the second end and the screening plate; the screening plate is provided with a plurality of second sieve holes, and the apertures of the first sieve holes and the second sieve holes in the same screening area are equal; a notch is provided at a portion of the drum wall overlapping with the arc plate, so that the material deviating from the bottom of the drum screen passes through the second sieve hole and falls from the notch;

[0007] An inner drum is installed in the drum screen, and a planetary gear is connected between the end of the drum screen away from the material inlet and the inner drum. A top plate is fixedly installed on the inner drum. The connecting plate and the screening plate are both made of flexible materials. The top plate can contact the connecting plate so that both the connecting plate and the screening plate can be deformed.

[0008] By adopting the above technical scheme, the present invention adds an auxiliary screener, the screen plate of the auxiliary screener can contact the material and is provided with a second screen hole with the same aperture as the first screen hole of the same level screening area, thereby increasing the screening area of ​​the screening area, and the material that can pass through the screen hole of this level, if it cannot pass through the first screen hole, can pass through the second screen hole and fall into the material guide, thereby improving the screening accuracy, and the screen plate can be deformed, which is beneficial to reducing the blockage of the second screen hole by the material, and is also beneficial to the dispersion of the material contacting the screen plate, reducing the aggregation of the material, and is beneficial to improving the screening accuracy. Specifically, the material is transported from the material inlet to the drum screen, the driving assembly drives the drum screen and the inner drum to rotate, the material follows the drum screen to rotate and enter the screening area, the material at the bottom of the screening area and that can pass through the first screen hole falls onto the material guide after passing through the first screen hole by gravity; as the drum screen rotates, the screen plate contacts the material, and the material that can pass through the second screen hole falls from the gap after passing through the second screen hole, and falls into the material guide along the outer wall of the drum screen. The materials that have not passed through the first and second sieve holes follow the rotation of the drum screen and enter the next screening area for screening. The top plate on the inner drum follows the rotation of the inner drum and contacts the connecting plate, causing the connecting plate to deform. Since the connecting plate and the screening plate are fixedly connected, the screening plate is also deformed, which is conducive to the dispersion of the materials contacting the screening plate, reducing the aggregation of materials, and improving the accuracy of screening. At the same time, the deformation of the screening plate can also make the materials stuck on the second sieve hole vibrate, so that the materials fall back into the drum screen, reducing the blockage of the second sieve hole.

[0009] Preferably, two brush rollers are arranged in parallel at the material inlet, the axial direction of the brush roller is perpendicular to the axial direction of the drum screen, and a gap is left between the two brush rollers for the material to pass through.

[0010] By adopting the above technical solution, the bristles on the two brush rollers can clean the surface of the material to improve the cleanliness of the material, and the gap between the two brush rollers allows the material to pass through, which is beneficial to reduce the accumulation of material at the material inlet, thereby improving the screening accuracy.

[0011] Preferably, an arc-shaped transition plate is connected between the first end and the screening plate, so that the material moves along the transition plate to contact the screening plate.

[0012] By adopting the above technical solution, the transition plate allows the material to transition from the inner wall of the drum screen to the screening plate, thereby reducing damage to the material caused by direct contact with the screening plate.

[0013] Preferably, the connecting plate is arc-shaped and protrudes toward the axis of the drum screen, so that the material that does not fall into the first sieve hole and the second sieve hole falls onto the inner wall of the drum screen along the arc-shaped surface of the connecting plate.

[0014] By adopting the above technical solution, the material that does not fall into the first sieve hole and the second sieve hole falls onto the inner wall of the drum screen along the arc surface of the connecting plate. The connecting plate is designed to be an arc convex toward the axis of the drum screen, which is conducive to reducing the collision of the inner wall of the drum screen with the material and reducing the breakage rate of the material. At the same time, the auxiliary screener can stir the material to reduce the aggregation of the material, which is conducive to improving the accuracy of screening.

[0015] Preferably, the material guide is fixedly mounted on the frame, and includes a side plate, a first rotating shaft, a second rotating shaft and a material guide trough. The multiple side plates are arranged at intervals, the first rotating shaft is rotatably mounted on the bottom of two adjacent side plates, the second rotating shaft is rotatably mounted on one end of the two adjacent side plates, and the material guide trough is fixedly mounted on the other end of the two adjacent side plates and is used to discharge materials.

[0016] By adopting the above technical solution, the material falling from the first sieve hole and the second sieve hole falls onto the first rotating shaft and is output from the material guide trough. The second rotating shaft blocks the material so that the material can smoothly enter the material guide trough. The friction between the first rotating shaft, the second rotating shaft and the material is rolling friction, which is conducive to the material falling smoothly into the material guide trough.

[0017] Preferably, an arc-shaped groove is opened on the side plate, a dust cover is fixedly installed in the arc-shaped groove, the drum screen is located in the dust cover, the dust cover includes a cover body and a baffle fixedly connected, the cover body and the baffle are both arc-shaped, a material guide cavity is formed between the first rotating shaft, the second rotating shaft, the side plate and the cover body, a material discharge port is left between the cover body and the baffle, the material discharge port is located in the material guide cavity, and along the rotation direction of the drum screen, the distance between the drum screen and the baffle gradually decreases so that the baffle can push the material stuck on the first screen hole to fall.

[0018] By adopting the above technical solution, the dust cover is helpful to reduce the impurities on the surface of the material falling into the air, and the material falling from the first sieve hole and the second sieve hole enters the material guide cavity through the discharge port and falls into the material guide groove. Along the direction of rotation of the drum screen, the distance between the drum screen and the baffle gradually decreases. As the drum screen rotates, the baffle can push the material stuck in the first sieve hole, causing the material to fall back into the drum screen, thereby reducing the blockage of the first sieve hole.

[0019] Preferably, a material baffle plate is fixedly installed on the cover body and located at the material inlet, and the material baffle plate includes an upper baffle plate located above the brush roller and a lower baffle plate located below the brush roller.

[0020] By adopting the above technical solution, the upper baffle blocks the upper part of the brush roller, and the lower baffle blocks the lower part of the brush roller, thereby reducing the material falling into the drum screen from above and below the brush roller, reducing the accumulation of material at the material inlet, and helping to improve the accuracy of material screening.

[0021] Preferably, the drum screen is also provided with a cleaning mechanism capable of cleaning the surface of the material, the cleaning mechanism comprising a brush assembly and a suction assembly, the brush assembly comprising soft bristles 1 fixedly mounted on the outer surface of the inner drum, soft bristles 2 fixedly mounted at the connection between the screening plate and the connecting plate, and soft bristles 3 fixedly mounted in the middle part of the connecting plate.

[0022] By adopting the above technical solution, the cleaning mechanism can clean the surface of the material. Specifically, the bristle component cleans the surface of the material, and the suction component can remove the cleaned impurities. The soft bristles 2, 3 and 1 cooperate to clean the surface of the material. When the material moves along the connecting plate to the inner wall of the drum screen, the soft bristles 3 can buffer the material, which is beneficial to reduce damage to the material.

[0023] Preferably, the suction assembly includes a suction cylinder rotatably connected to the inner drum, a suction pipe fixedly connected to the end of the suction cylinder, a storage box installed on the suction pipe, and an induced draft fan installed on the storage box and connected to the suction pipe. The axes of the inner drum and the suction cylinder are colinear, a plurality of suction ports 1 are opened on the suction cylinder along the axial direction, a plurality of suction ports 2 are opened on the inner drum along the axial direction, a filter mesh bag is provided in the storage box, and the bag mouth of the filter mesh bag is connected to the pipe mouth of the suction pipe. As the inner drum rotates, the suction port 1 can be connected with the suction port 2.

[0024] By adopting the above technical scheme, as the inner drum rotates, the air inlet 1 and the air inlet 2 are connected, and the induced draft fan draws air, so that negative pressure is formed in the storage box, the suction pipe, and the suction cylinder. At the same time, the external airflow enters the interior of the drum screen through the material guide trough, the material discharge port, the first sieve hole or the second sieve hole in turn, and enters the suction cylinder through the air inlet 1 and the air inlet 2. The route of the external airflow movement can bring the impurities in the drum screen into the suction cylinder and into the filter mesh bag of the storage box, thereby collecting the impurities, which is beneficial to keeping the material clean and reducing the blockage of the first sieve hole and the second sieve hole by impurities.

[0025] In another aspect, the present invention provides a material screening method, using the material screening device, comprising the following steps:

[0026] Step 1: transport the material from the material inlet to the drum screen, and the driving assembly drives the drum screen and the inner drum to rotate;

[0027] Step 2: The material rotates with the drum screen, and the material at the bottom of the screening area and can pass through the first sieve hole passes through the first sieve hole and falls onto the material guide, and the material at the screening area deviating from the bottom and can pass through the second sieve hole passes through the second sieve hole and falls onto the material guide through the gap;

[0028] Step 3: The top plate contacts the connecting plate, causing the connecting plate and the screening plate to deform, and the material that has not passed through the first and second sieve holes follows the drum screen to the next screening area for screening.

[0029] By adopting the above technical scheme, the screen plate of the auxiliary screener can contact the material and is provided with a second screen hole with the same aperture as the first screen hole in the screening area of ​​the same level, thereby increasing the screening area of ​​the screening area. If the material in the screen hole of this level cannot pass through the first screen hole, it can pass through the second screen hole and fall into the material guide, thereby improving the screening accuracy. The screen plate can be deformed, which is beneficial to reduce the blockage of the second screen hole by the material, and is beneficial to the dispersion of the material contacting the screen plate, reducing the aggregation of the material, and is beneficial to improving the screening accuracy.

[0030] The beneficial effects of the above technical solution of the present invention are as follows:

[0031] 1. The screen plate of the auxiliary screener of the present invention can contact the material and is provided with a second screen hole with the same aperture as the first screen hole of the same-level screening area, thereby increasing the screening area of ​​the screening area. If the material in the screen hole of this level cannot pass through the first screen hole, it can pass through the second screen hole and fall into the material guide, thereby improving the screening accuracy. The screen plate can be deformed, which is beneficial to reduce the blockage of the second screen hole by the material, and is also beneficial to the dispersion of the material contacting the screen plate, reducing the aggregation of the material, and is beneficial to improving the screening accuracy.

[0032] 2. Two brush rollers are arranged in parallel at the material inlet of the present invention. The bristles on the two brush rollers can clean the surface of the material to improve the cleanliness of the material. The gap between the two brush rollers allows the material to pass through, which is beneficial to reduce the accumulation of materials at the material inlet, thereby improving the accuracy of screening.

[0033] 3. The soft bristles 2, 3 and 1 of the bristle assembly of the present invention cooperate to clean the surface of the material. When the material moves along the connecting plate to the inner wall of the drum screen, the soft bristles 3 can buffer the material, which is beneficial to reduce damage to the material.

[0034] 4. With the rotation of the inner drum, the air inlet 1 is connected with the air inlet 2, and the induced draft fan draws air to form a negative pressure in the storage box, the suction pipe and the suction cylinder. At the same time, the external airflow enters the drum screen through the material guide trough, the material discharge port, the first sieve hole or the second sieve hole in turn, and enters the suction cylinder through the air inlet 1 and the air inlet 2. The route of the external airflow can bring the impurities in the drum screen into the suction cylinder and into the filter bag of the storage box, thereby collecting the impurities, which is beneficial to keep the material clean and reduce the blockage of the first sieve hole and the second sieve hole by impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a three-dimensional diagram of the material screening device of the present invention;

[0036] Figure 2 A perspective view of a drum screen according to the present invention;

[0037] Figure 3 A three-dimensional diagram of a drum screen according to the present invention having a dust cover installed thereon;

[0038] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0039] Figure 5 is a three-dimensional diagram of the screening area of ​​the present invention;

[0040] Figure 6 A three-dimensional diagram of the connection between the dust cover and the material guide of the present invention;

[0041] Figure 7It is a cross-sectional view of the suction cylinder and the inner rotating cylinder of the present invention.

[0042] In the figure: 1, frame; 2, drum screen; 21, drum wall; 211, first sieve hole; 212, screening area; 213, material inlet; 214, brush roller; 22, auxiliary screener; 221, arc plate; 222, screening plate; 223, connecting plate; 224, second sieve hole; 225, transition plate; 226, notch; 227, first end; 228, second end; 23, inner drum; 231, top plate; 24, planetary gear; 241, sun gear; 242, planetary gear; 243, gear ring; 25, drive assembly; 26, support frame; 261, support ring; 262, support rod; 263, rotating drum Moving ring; 27, dust cover; 271, cover body; 272, baffle; 273, feed port; 28, material guide; 281, side plate; 282, first rotating shaft; 283, second rotating shaft; 284, material guide trough; 29, baffle plate; 291, upper baffle; 292, lower baffle; 3, cleaning mechanism; 31, brush assembly; 311, soft bristle one; 312, soft bristle two; 313, soft bristle three; 32, suction assembly; 321, suction cylinder; 322, suction pipe; 323, storage box; 324, induced draft fan; 325, air inlet one; 326, air inlet two; 4, belt conveyor; 5, vibrating screen. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the embodiments of the present invention. Figure 1-Figure 7 , the technical scheme of the embodiment of the present invention is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0044] Example

[0045] This embodiment provides a material screening device, specifically for screening garlic, and can also be used to screen other materials such as apples. Figure 2 As shown, the material screening device includes a frame 1, a drum screen 2, a drive assembly 25 and a cleaning mechanism 3.

[0046] like Figure 2 As shown, the frame 1 provides support for the drum screen 2 and the driving assembly 25. The driving assembly 25 drives the drum screen 2 to rotate to screen the garlic in the drum screen 2, and the cleaning mechanism 3 can clean the dust and garlic skin on the surface of the garlic.

[0047] like Figure 4 As shown, the drum screen 2 includes a drum wall 21 , an auxiliary screener 22 and an inner drum 23 .

[0048] like Figure 1 and Figure 4 As shown, the drum wall 21 is rotatably connected to the frame 1, and one end of the drum wall 21 is a material inlet 213. The garlic transported by the belt conveyor 4 enters the drum screen 2 through the material inlet 213. In this embodiment, a vibrating screen 5 is further provided between the output end of the belt conveyor 4 and the material inlet 213. Along the conveying direction of the garlic, the screen surface of the vibrating screen 5 is tilted downward, so that the garlic on the belt conveyor 4 is transported to the vibrating screen 5, and after vibrating on the vibrating screen 5, it moves along the screen surface to the material inlet 213.

[0049] like Figure 1 and Figure 4 As shown, two brush rollers 214 are arranged in parallel at the material inlet 213, and the axial direction of the brush rollers 214 is perpendicular to the axial direction of the drum screen 2, and a gap is left between the two brush rollers 214 for the garlic to pass through. The bristles on the two brush rollers 214 can clean the dust and garlic skin on the surface of the garlic, improving the cleanliness of the garlic, and the gap between the two brush rollers 214 allows the garlic to pass through, which is conducive to reducing the accumulation of garlic at the material inlet 213, thereby improving the accuracy of screening.

[0050] like Figure 2 and Figure 4 As shown, the cylinder wall 21 is provided with multiple first sieve holes 211 with different apertures to form a multi-stage screening area 212, and the apertures of the first sieve holes 211 extending from the material inlet 213 on the cylinder wall 21 along the axial direction are increased successively. The inner diameter of the cylinder wall 21 gradually increases along the conveying direction of the garlic, so that the bottom of the cylinder wall 21 is tilted downward, so that when the cylinder wall 21 rotates, the garlic at the bottom of the cylinder wall 21 moves along the conveying direction and undergoes multi-stage screening.

[0051] like Figure 2 and Figure 6 As shown, a material guide 28 for receiving the garlic screened from the cylinder wall 21 is provided below the cylinder wall 21. The material guide 28 includes a side plate 281, a first rotating shaft 282, a second rotating shaft 283 and a material guide trough 284.

[0052] like Figure 2 and Figure 6 As shown, a plurality of side plates 281 are arranged in parallel at intervals, and the plate surface of the side plates 281 is perpendicular to the conveying direction of the garlic, and the side plates 281 are arranged on both sides of the screening area 212, so as to facilitate the collection of the garlic screened by the screening area 212. The conveying direction of the garlic is the left-right direction.

[0053] The first rotating shaft 282 is rotatably mounted at the bottom of two adjacent side plates 281, and the axial direction of the first rotating shaft 282 is parallel to the conveying direction of the garlic. A plurality of first rotating shafts 282 are arranged in parallel, and a spacing is left between two adjacent first rotating shafts 282.

[0054] like Figure 6 As shown, the second rotating shaft 283 is rotatably mounted at one end of two adjacent side plates 281 , the axial direction of the second rotating shaft 283 is parallel to the conveying direction of the garlic, a plurality of second rotating shafts 283 are arranged in parallel up and down, and a spacing is also left between two adjacent second rotating shafts 283 .

[0055] like Figure 3 and Figure 6 As shown, the material guide trough 284 is fixedly mounted on one end of two adjacent side plates 281 away from the second rotating shaft 283 , and the notch of the material guide trough 284 is tilted downward to facilitate the screening of garlic from the material guide trough 284 .

[0056] like Figure 2 and Figure 6 As shown, the garlic screened from the screening area 212 falls onto the second rotating shaft 283 and is output from the guide trough 284. The second rotating shaft 283 blocks the garlic, and the friction between the first rotating shaft 282 and the second rotating shaft 283 and the garlic is rolling friction, which is conducive to the garlic falling into the guide trough 284 smoothly.

[0057] like Figure 3 and Figure 4 As shown, an arc groove is opened on the side plate 281, and a dust cover 27 is fixedly installed in the arc groove. The drum screen 2 is located in the dust cover 27, and the dust cover 27 is sleeved on the outer wall of the drum screen 2, leaving a gap between the dust cover 27 and the outer wall of the drum screen 2.

[0058] like Figure 3 and Figure 4 As shown, the dust cover 27 includes a cover body 271 and a baffle 272 that are fixedly connected, and both the cover body 271 and the baffle 272 are arc-shaped. The cover body 271 is fixedly connected in the arc-shaped groove, and a material guide cavity is formed between the first rotating shaft 282, the second rotating shaft 283, the side plate 281 and the cover body 271. The baffle 272 is located above the material guide groove 284 and is bent toward the cover body 271. The baffle 272 is provided with an avoidance groove at the part located on the side plate 281 so that the baffle 272 can bend into the arc-shaped groove. A material discharge port 273 is left between the cover body 271 and the baffle 272, and the material discharge port 273 is located in the material guide cavity. Along the rotation direction of the drum screen 2, the distance between the drum screen 2 and the baffle 272 gradually decreases, so that the baffle 272 can push the garlic stuck on the first sieve hole 211 to fall, so that the garlic returns to the drum screen 2.

[0059] like Figure 3 and Figure 4As shown, the dust cover 27 helps to reduce the dust on the surface of the garlic and the garlic skin from falling into the air. The garlic falling from the screening area 212 enters the material guide cavity through the discharge port 273 and falls into the material guide groove 284. Along the rotation direction of the drum screen 2, the distance between the drum screen 2 and the baffle 272 gradually decreases. As the drum screen 2 rotates, the baffle 272 can push the garlic stuck in the first sieve hole 211, so that the garlic falls back into the drum screen 2, reducing the blockage of the first sieve hole 211.

[0060] like Figure 3 and Figure 4 As shown, a material baffle plate 29 is fixedly installed on the cover body 271 and located at the material inlet 213 . The material baffle plate 29 includes an upper baffle plate 291 located above the brush roller 214 and a lower baffle plate 292 located below the brush roller 214 .

[0061] like Figure 3 and Figure 4 As shown, the upper baffle 291 blocks the upper part of the brush roller 214, and the lower baffle 292 blocks the lower part of the brush roller 214, thereby reducing the garlic that falls from the upper and lower parts of the brush roller 214 into the drum screen 2, reducing the accumulation of garlic at the material inlet 213, and improving the accuracy of garlic screening.

[0062] like Figure 2 and Figure 5 As shown, three auxiliary screeners 22 are evenly distributed along the circumferential direction on the inner wall of the drum screen 2 in each screening area 212 to increase the screening area. The auxiliary screener 22 includes an arc plate 221, a screening plate 222 and a connecting plate 223 connected in sequence, and the arc plate 221, the screening plate 222 and the connecting plate 223 form an independent cavity.

[0063] like Figure 2 and Figure 5 As shown, the arc plate 221 is inscribed inwardly with the inner wall of the drum screen 2 and is closely attached to the inner wall of the drum screen 2 . Along the counterclockwise rotation direction of the drum screen 2 , the arc plate 221 has a first end 227 and a second end 228 .

[0064] like Figure 5 As shown, the sieve plate 222 is arranged on the first end 227, and an arc-shaped transition plate 225 is connected between the first end 227 and the sieve plate 222. The sieve plate 222 is provided with multiple levels of second sieve holes 224, and the apertures of the first sieve holes 211 and the second sieve holes 224 of the same level screening area 212 are equal.

[0065] like Figure 2 and Figure 5As shown, the connecting plate 223 is connected between the second end 228 and the sieve plate 222. The connecting plate 223 is arc-shaped and protrudes toward the axis of the drum screen 2, so that the garlic that does not fall into the first sieve hole 211 and the second sieve hole 224 falls onto the inner wall of the drum screen 2 along the arc surface of the connecting plate 223.

[0066] like Figure 2 and Figure 5 As shown, a notch 226 is provided on the wall 21 of the drum screen 2 at a position overlapping with the arc plate 221 , so that the garlic deviating from the bottom of the drum screen 2 can pass through the second sieve hole 224 and fall from the notch 226 .

[0067] like Figure 2 and Figure 5 As shown, the rotating direction of the drum screen 2 is counterclockwise, and the inner wall of the drum screen 2 between the screening plate 222 and the adjacent connecting plate 223 is the part where garlic gathers. Garlic that meets the size requirements can pass through the first screen hole 211 of this part; some garlic that can pass through the first screen hole 211 but cannot pass through the first screen hole 211 can pass through the second screen hole 224. Specifically, as the drum screen 2 rotates, the screening plate 222 contacts the garlic, and the garlic that can pass through the second screen hole 224 falls from the gap 226 after passing through the second screen hole 224, and falls into the guide 28 along the outer wall of the drum screen 2. The transition plate 225 transitions the movement of the garlic from the inner wall of the drum screen 2 to the screening plate 222, reducing the damage to the garlic caused by direct contact with the screening plate 222. The garlic that does not fall into the first sieve hole 211 and the second sieve hole 224 falls onto the inner wall of the drum screen 2 along the arc surface of the connecting plate 223. The connecting plate 223 is designed to be an arc convex toward the axis of the drum screen 2, which is conducive to reducing the collision of the inner wall of the drum screen 2 with the garlic and reducing the breakage rate of the garlic. At the same time, the auxiliary screener 22 can stir the garlic to reduce the aggregation of the garlic, which is conducive to improving the accuracy of screening.

[0068] like Figure 2 and Figure 5 As shown, the inner drum 23 is arranged inside the drum screen 2, and a planetary gear 24 is connected between the end of the drum screen 2 away from the material inlet 213 and the inner drum 23. A plurality of top plates 231 are fixedly installed on the inner drum 23. The connecting plates 223 and the screening plates 222 are both made of flexible materials. The top plates 231 can contact the connecting plates 223 so that both the connecting plates 223 and the screening plates 222 can be deformed.

[0069] like Figure 2 and Figure 5As shown, the top plate 231 on the inner drum 23 rotates with the inner drum 23 and contacts the connecting plate 223, causing the connecting plate 223 to deform. Since the connecting plate 223 and the screening plate 222 are fixedly connected, the screening plate 222 is also deformed, which is beneficial to the dispersion of the garlic that contacts the screening plate 222, reduces the aggregation of the garlic, and is beneficial to improve the screening accuracy. At the same time, the deformation of the screening plate 222 can also make the garlic stuck on the second sieve hole 224 vibrate, so that the garlic falls back into the drum screen 2, reducing the blockage of the second sieve hole 224.

[0070] like Figure 2 and Figure 5 As shown, the driving assembly 25 is driven by a motor, which is a prior art and will not be described in detail. The driving assembly 25 drives the planetary gear 24 to rotate, thereby driving the inner drum 23 and the drum screen 2 to rotate. Specifically, the gear ring 243 of the planetary gear 24 is fixedly connected to the end of the drum screen 2, and the sun gear 241 of the planetary gear 24 is fixedly connected to the end of the inner drum 23. The motor drives the sun gear 241 to rotate, and drives the gear ring 243 to rotate through the planetary gear 242. Since the rotation directions of the sun gear 241 and the gear ring 243 are opposite, the rotation directions of the inner drum 23 and the drum screen 2 are opposite, so that the top plate 231 contacts the connecting plate 223, thereby causing the connecting plate 223 and the screening plate 222 to deform.

[0071] like Figure 3 and Figure 4 As shown, rollers (not shown) are provided at the lower part of the two ends of the drum screen 2 on the frame 1. The rotation direction of the rollers is opposite to that of the drum screen 2 and is used to support the lower part of the drum screen 2.

[0072] like Figure 2 and Figure 5 As shown, the connection between adjacent screening areas 212 is fixedly connected with a support frame 26 capable of supporting the drum screen 2, and the support frame 26 includes a support ring 261 fixedly mounted on the inner wall of the drum screen 2, a rotating ring 263 rotatably connected to the inner drum 23, and a support rod 262 fixedly connected between the support ring 261 and the rotating ring 263. The support frame 26 is used to support the middle part of the drum wall 21. One end of the inner drum 23 close to the material inlet 213 is connected to the frame 1 through a bearing.

[0073] like Figure 2 and Figure 5 As shown, the cleaning mechanism 3 comprises a bristle assembly 31 and a suction assembly 32. The bristle assembly 31 cleans the dust and garlic skins on the surface of the garlic, and the suction assembly 32 can remove the cleaned dust and garlic skins.

[0074] like Figure 5 As shown, the bristle assembly 31 includes soft bristle 1 311 , soft bristle 2 312 and soft bristle 3 313 .

[0075] like Figure 5 As shown, the soft bristles 311 are fixedly mounted on the outer surface of the inner drum 23 and extend along the axial direction of the inner drum 23 to form a group of soft bristle groups. A plurality of groups of soft bristle groups are evenly distributed in the circumferential direction of the inner drum 23.

[0076] like Figure 5 As shown, the soft bristle 2 312 is fixedly installed at the connection between the screening plate 222 and the connecting plate 223 , and the soft bristle 3 313 is fixedly installed at the middle part of the connecting plate 223 .

[0077] like Figure 2 and Figure 5 As shown, the soft bristles 2 312, the soft bristles 313 and the soft bristles 1 311 cooperate to clean the dust and garlic skin on the surface of the garlic. When the garlic moves along the connecting plate 223 to the inner wall of the drum screen 2, the soft bristles 3 313 can buffer the garlic, which is beneficial to reduce damage to the garlic.

[0078] like Figure 2 and Figure 7 As shown, the suction assembly 32 includes a suction cylinder 321 , a suction pipe 322 , a storage box 323 and an induced draft fan 324 .

[0079] like Figure 2 and Figure 7 As shown, the suction cylinder 321 is rotatably connected to the inside of the inner rotating cylinder 23, the axis of the suction cylinder 321 and the axis of the inner rotating cylinder 23 are colinear, and a plurality of suction ports 325 are opened on the suction cylinder 321 along the axial direction, and the opening direction of the suction ports 325 is upward.

[0080] like Figure 2 and Figure 7 As shown, a plurality of air inlets 326 are provided on the inner drum 23 along the axial direction. The air inlet 1 325 and the air inlet 2 326 are both rectangular, and the width in the left and right directions is smaller than the diameter of the garlic, so that only garlic skin and dust can pass through the air inlet 1 325 and the air inlet 2 326, while garlic cannot pass through the air inlet 1 325 and the air inlet 2 326.

[0081] like Figure 2 and Figure 7 As shown, one end of the suction pipe 322 is fixedly connected to the end of the suction cylinder 321 away from the material inlet 213 .

[0082] like Figure 2 and Figure 7 As shown, the storage box 323 is a sealed box installed on the suction pipe 322 . A filter bag is arranged in the storage box 323 , and the bag opening of the filter bag is connected to one end of the suction pipe 322 away from the suction cylinder 321 .

[0083] like Figure 2and Figure 7 As shown, the induced draft fan 324 is fixedly installed on the storage box 323, and the air outlet of the induced draft fan 324 is connected to the suction channel.

[0084] like Figure 2 and Figure 7 As shown, with the rotation of the inner drum 23, the air inlet 1 325 is connected to the air inlet 2 326, and the induced draft fan 324 draws air, so that negative pressure is formed in the storage box 323, the suction pipe 322, and the suction cylinder 321. At the same time, the external air flow enters the inside of the drum screen 2 through the material guide trough 284, the material discharge port 273, the first sieve hole 211 or the second sieve hole 224 in sequence, and enters the suction cylinder 321 through the air inlet 1 325 and the air inlet 2 326. The route of the external air flow can bring the dust and garlic skins in the drum screen 2 into the suction cylinder 321 and into the filter mesh bag of the storage box 323, so as to collect the dust and garlic skins, which is beneficial to keep the garlic clean and reduce the clogging of the first sieve hole 211 and the second sieve hole 224 by the garlic skins.

[0085] In addition, if Figure 6 As shown, there is a gap between two adjacent first rotating shafts 282 and two adjacent second rotating shafts 283 to increase the amount of external gas entering the feed opening 273, which is beneficial to Figure 2 The dust and garlic skin in the drum screen 2 shown in the figure are quickly brought to the Figure 7 In the suction cylinder 321 shown.

[0086] The method of using this embodiment is as follows:

[0087] Step 1: The garlic transported by the belt conveyor 4 is vibrated by the vibrating screen 5 and then enters the drum screen 2 through the gap between the two brush rollers 214. The driving assembly 25 drives the sun gear 241 of the planetary gear 24 to rotate, and drives the gear ring 243 to rotate through the planetary gear 242. Since the sun gear 241 and the gear ring 243 rotate in opposite directions, the inner drum 23 and the drum screen 2 are driven to rotate in opposite directions.

[0088] Step 2: The garlic rotates with the drum screen 2. The garlic at the bottom of the screening area 212 and can pass through the first sieve hole 211 passes through the first sieve hole 211 and falls onto the first rotating shaft 282 of the guide 28, and is discharged from the guide groove 284. The garlic at the bottom of the screening area 212 and can pass through the second sieve hole 224 contacts the screening plate 222, passes through the second sieve hole 224, and then falls onto the first rotating shaft 282 through the notch 226, and is discharged from the guide groove 284.

[0089] Step 3: The top plate 231 rotates with the inner drum 23. When the top plate 231 contacts the connecting plate 223, the connecting plate 223 and the screening plate 222 are deformed, which is beneficial to the dispersion of the garlic contacting the screening plate 222, reducing the aggregation of the garlic, and improving the accuracy of screening. At the same time, the deformation of the screening plate 222 can also make the garlic stuck on the second sieve hole 224 vibrate, so that the garlic falls back into the drum screen 2, reducing the blockage of the second sieve hole 224; when the garlic is stuck in the first sieve hole 211, as the drum screen 2 rotates, the distance between the drum screen 2 and the baffle 272 gradually decreases, and the baffle 272 can push the garlic stuck in the first sieve hole 211, so that the garlic falls back into the drum screen 2, reducing the blockage of the first sieve hole 211;

[0090] Step 4: The garlic that has not fallen into the first sieve hole 211 and the second sieve hole 224 falls onto the inner wall of the drum screen 2 along the arc surface of the connecting plate 223. The soft bristles 2 312, 313 and 1 311 cooperate to clean the dust and garlic skin on the surface of the garlic. When the garlic moves along the connecting plate 223 to the inner wall of the drum screen 2, the soft bristles 3 313 can buffer the garlic, which is beneficial to reduce the damage to the garlic.

[0091] Step 5: Due to the obstruction of the dust cover 27, the cleaned garlic skins and dust float inside the drum screen 2. As the inner drum 23 rotates, the air inlet 1 325 is connected to the air inlet 2 326, and the induced draft fan 324 draws air, so that negative pressure is formed in the storage box 323, the suction pipe 322, and the suction cylinder 321. At the same time, the external airflow enters the drum screen 2 through the guide groove 284, the feed opening 273, the first sieve hole 211 or the second sieve hole 224 in sequence, and enters the suction cylinder 321 through the air inlet 1 325 and the air inlet 2 326. The route of the external airflow can bring the dust and garlic skins in the drum screen 2 into the suction cylinder 321 and into the filter bag of the storage box 323, so as to collect the dust and garlic skins, which is conducive to keeping the garlic clean and reducing the clogging of the first sieve hole 211 and the second sieve hole 224 by the garlic skins.

[0092] Step 6: The garlic that has not passed through the first sieve hole 211 and the second sieve hole 224 follows the drum screen 2 to the next screening area 212 and is screened until all the garlic in the drum screen 2 has been screened.

[0093] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0094] The above is a preferred embodiment 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 principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A material screening device, comprising a frame, a drum screen arranged on the frame and a driving assembly for driving the drum screen to rotate, wherein the drum screen is provided with a plurality of first screen holes of different apertures to form a multi-stage screening area, one end of the drum screen is a material inlet, and a material guide for receiving the material falling from the first screen holes is provided at the lower end of the drum screen, characterized in that: An auxiliary screener is fixedly installed in the screening area, and the auxiliary screener includes an arc plate, a screening plate and a connecting plate connected in sequence; the arc plate is inscribed inwardly with the inner wall of the drum screen and is closely attached to the inner wall of the drum screen, and along the rotation direction of the drum screen, the arc plate has a first end and a second end, the screening plate is fixedly connected to the first end, and the connecting plate is connected between the second end and the screening plate; a plurality of levels of second sieve holes are arranged on the screening plate, and the apertures of the first sieve holes and the second sieve holes in the same level screening area are equal; a notch is arranged on the wall of the drum screen at a position overlapping with the arc plate, so that materials deviating from the bottom of the drum screen pass through the second sieve holes and fall from the notch; An inner drum is installed in the drum screen, and a planetary gear is connected between the end of the drum screen away from the material inlet and the inner drum. A top plate is fixedly installed on the inner drum. The connecting plate and the screening plate are both made of flexible materials. The top plate can contact the connecting plate so that both the connecting plate and the screening plate can be deformed.

2. The material screening device according to claim 1, characterized in that: Two brush rollers are arranged in parallel at the material inlet, the axial direction of the brush roller is perpendicular to the axial direction of the drum screen, and a gap is left between the two brush rollers for the material to pass through.

3. The material screening device according to claim 1, characterized in that: An arc-shaped transition plate is also connected between the first end and the screening plate, so that the material moves along the transition plate to contact the screening plate.

4. The material screening device according to claim 1, characterized in that: The connecting plate is arc-shaped and protrudes toward the axis of the drum screen, so that the materials that do not fall into the first sieve hole and the second sieve hole fall onto the inner wall of the drum screen along the arc-shaped surface of the connecting plate.

5. The material screening device according to claim 2, characterized in that: The material guide is fixedly installed on the frame, and includes a side plate, a first rotating shaft, a second rotating shaft and a material guide trough. The multiple side plates are arranged at intervals. The first rotating shaft is rotatably installed at the bottom of two adjacent side plates, the second rotating shaft is rotatably installed at one end of the two adjacent side plates, and the material guide trough is fixedly installed at the other end of the two adjacent side plates and is used to export materials.

6. The material screening device according to claim 5, characterized in that: The side plate is provided with an arc groove, in which a dust cover is fixedly installed, the drum screen is located in the dust cover, the dust cover includes a cover body and a baffle fixedly connected, the cover body and the baffle are both arc-shaped, a material guide cavity is formed between the first rotating shaft, the second rotating shaft, the side plate and the cover body, a material discharge port is left between the cover body and the baffle, the material discharge port is located in the material guide cavity, along the direction of rotation of the drum screen, the distance between the drum screen and the baffle gradually decreases, so that the baffle can push the material stuck on the first screen hole to fall.

7. The material screening device according to claim 6, characterized in that: A material baffle plate is fixedly installed on the cover body and located at the material inlet. The material baffle plate comprises an upper baffle plate located above the brush roller and a lower baffle plate located below the brush roller.

8. The material screening device according to claim 1, characterized in that: The drum screen is also provided with a cleaning mechanism capable of cleaning the surface of the material, the cleaning mechanism comprising a brush assembly and a suction assembly, the brush assembly comprising soft bristles 1 fixedly mounted on the outer surface of the inner drum, soft bristles 2 fixedly mounted at the connection between the screening plate and the connecting plate, and soft bristles 3 fixedly mounted in the middle part of the connecting plate.

9. The material screening device according to claim 8, characterized in that: The suction assembly includes a suction cylinder rotatably connected to the inner drum, a suction pipe fixedly connected to the end of the suction cylinder, a storage box installed on the suction pipe, and an induced draft fan installed on the storage box and connected to the suction pipe. The axes of the inner drum and the suction cylinder are colinear, a plurality of suction ports 1 are opened on the suction cylinder along the axial direction, a plurality of suction ports 2 are opened on the inner drum along the axial direction, a filter mesh bag is provided in the storage box, and the bag opening of the filter mesh bag is connected to the pipe opening of the suction pipe. As the inner drum rotates, the suction port 1 can be connected to the suction port 2.

10. A material screening method, using the material screening device according to claim 1, characterized in that: The following steps are involved: Step 1: transport the material from the material inlet to the drum screen, and the driving assembly drives the drum screen and the inner drum to rotate; Step 2: The material follows the rotation of the drum screen and enters the screening area. The material at the bottom of the screening area and can pass through the first sieve hole passes through the first sieve hole and falls onto the material guide. The material at the bottom of the screening area and can pass through the second sieve hole passes through the second sieve hole and falls onto the material guide through the gap. Step 3: The top plate contacts the connecting plate, causing the connecting plate and the screening plate to deform, and the material that has not passed through the first and second sieve holes follows the drum screen to the next screening area for screening.

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