Grain and bean screening and peeling method

Abstract

The invention discloses a screening and peeling method for grains and beans. The screening and peeling method comprises the following steps: S1, providing a screening, selecting and shelling device; s2, a screening, selecting and shelling device is started, and the soybeans are continuously fed into a screening barrel from a screening feeding opening; s3, the screening barrel rotates, and in the rotating process, the screening spiral blades rotate along with the screening barrel and push the soybeans from the first screening cavity to the third screening cavity; in the pushing process, impurities and defective products can fall into a second connection cavity and a third connection cavity through screening holes of a first screening cavity and a second screening cavity and are sent out; and S4, the screened soybeans continuously fall into the hulling extrusion roller set through screening holes of the third connection cavity to be extruded and broken, the broken soybean hulls are pumped out by an external suction system, and the soybean halves fall into the third conveying cavity and are sent out. According to the method, automatic screening and peeling of grains and beans can be achieved, the space is saved, and the blocking condition is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bean screening and peeling, in particular to a method for screening and peeling grain beans. Background Art

[0002] The main function of screening grain beans is to improve the quality of beans and remove impurities. The screened beans can be stored for other purposes or refined into soybean oil. Taking soybeans as an example, there will be some shriveled residual beans in the soybeans after being harvested and shelled by a harvester. After screening out high-quality soybeans, the soybeans are peeled to separate the soybean skin from the soybeans, and finally the soybeans are used for oil refining.

[0003] Patent No. 202323399318.5 discloses a soybean grading and screening device, which can classify and screen the soybeans entering the hopper, but the high-quality soybeans need to be collected after screening and moved to a peeling device for peeling. At this time, the screened soybeans are sent to the peeling device manually or with special conveying equipment. At the same time, the screening device uses a screw to push the soybeans to move. The screening cylinder is fixed during the movement of the soybeans, so the actual screening is to use the sieve holes at the bottom of the screening cylinder. The number of sieve holes at the bottom of the screening cylinder is fixed. Once blockage occurs, the screening number will be reduced, and it is easy for the screening to be incomplete.

[0004] At the same time, Patent No. 202322601508.4 discloses a wild soybean peeling device, which can peel soybeans through a peeling mechanism and a screening mechanism. During use, the soybeans need to be graded and screened before they can be put in, and the soybeans that need to be peeled need to be manually carried, which is also very wasteful of manpower. It is impossible to automatically screen and peel the soybeans starting from the grading and screening. In addition, if the screening and peeling of beans are to be achieved, additional connecting equipment is required to connect the two devices, such as a special soybean conveying device specially set up to connect the screening device and the peeling device, which occupies a large amount of factory space as a whole. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for screening and peeling grain beans, which can realize automatic screening and peeling of grain beans, save space and reduce blockage.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a method for screening and peeling grain beans, comprising the following steps:

[0007] S1. Provide a screening, selecting and shelling device, comprising an installation cover, on which a screening drum for screening soybeans is rotatably installed, wherein the screening drum is divided into a first screening chamber, a second screening chamber and a third screening chamber, and the first screening chamber, the second screening chamber and the third screening chamber are all provided with screening holes, and a screening spiral blade is spirally installed on the inner wall of the screening drum, which pushes it from the first screening chamber to the third screening chamber, and the screening drum is driven to rotate by a screening rotating power device, and the sizes of the screening holes in the first screening chamber, the second screening chamber and the third screening chamber increase successively, and a screening feed port is provided at the end of the screening drum near the first screening chamber, and the installation cover covers the screening drum so that the screening drum screens and discharges materials downward, and a partition is provided below the first screening chamber, the second screening chamber and the third screening chamber in the installation cover. A first connecting chamber, a second connecting chamber and a third connecting chamber are provided which are connected to each other, wherein a peeling and squeezing roller group for peeling soybeans is rotatably installed in the third connecting chamber, and the peeling and squeezing roller group is driven to rotate by the peeling rotating device. The lower part of the third connecting chamber is connected to a third conveying chamber for conveying the peeled soybeans, and a third conveying chamber is provided with a third spiral conveying structure, and the first connecting chamber and the second connecting chamber are provided with a first spiral conveying structure and a second spiral conveying structure for directly conveying and discharging the soybeans under the first screening chamber and the second screening chamber. An exhaust box for sucking the third screening chamber, the third connecting chamber and the third conveying chamber is provided on the side wall of the mounting cover, and the suction box is connected to an external suction system, and a screen is also provided between the third connecting chamber and the third conveying chamber to facilitate the falling of crushed bean petals.

[0008] S2, the screening and shelling device is started, and the soybeans are continuously fed into the screening cylinder from the screening feed port;

[0009] S3. The screening drum rotates. During the rotation, the screening spiral blade rotates with the screening drum and pushes the soybeans from the first screening chamber to the third screening chamber. During the pushing process, impurities and defective products pass through the screening holes of the first and second screening chambers and fall into the second and third connecting chambers and are sent out.

[0010] S4. The screened soybeans pass through the screening holes of the third connecting chamber and continuously fall between the peeling and squeezing rollers to be squeezed and broken. The broken soybean skins are sucked out by the external suction system and the soybeans fall into the third conveying chamber and are sent out.

[0011] As a preferred solution, the first spiral conveying structure and the second spiral conveying structure are both conveying screws, and the two conveying screws are respectively connected to the first extrusion roller and the second extrusion roller of the peeling extrusion roller group to share a peeling rotating device, so this can save costs.

[0012] As a preferred solution, the conveying directions of the first spiral conveying structure, the second spiral conveying structure and the third spiral conveying structure are opposite to the screening and conveying direction of the soybeans in the screening drum, so that the entire screening length is the length of the entire machine, further shortening the length of the equipment and reducing the footprint.

[0013] As a preferred solution, the first screening material chamber, the second screening material chamber and the third screening material chamber are equal in length.

[0014] As a preferred solution, in step S2, a vacuum loader is used to feed the soybeans into the screening cylinder.

[0015] As a preferred solution, the screening and peeling method also includes a cleaning method for cleaning the screening holes of the screening cylinder. A pulsed airflow is sprayed from the outside of the screening cylinder to the screening holes through a nozzle. The pulsed airflow will clear the blocked screening holes. By using the pulsed airflow to blow the screening holes, the beans in the screening holes can be loosened, thereby cooperating with the roller of the screening cylinder and the gravity of the beans themselves to clean the screening holes and reduce the blockage of the screening holes.

[0016] As a preferred solution, the nozzles are located above the screening drum, and the nozzles are arranged in at least one row in the longitudinal direction of the screening drum.

[0017] As a preferred solution, the external suction system is an exhaust fan, the exhaust port of the exhaust fan is connected to the exhaust box through a dust collector, the nozzles are arranged at intervals on the pulse blowing pipe, and the pulse blowing pipe is connected to the compressed gas cylinder.

[0018] After adopting the above technical scheme, the effect of the present invention is as follows: the screening and peeling method adopts a rotating screening drum for screening, so that all the screening holes on the barrel of the screening drum can be used, thereby reducing the blockage, especially if the beans block the screening holes. At this time, the screening is carried out by rotating to make the blocked screening holes run above, and the screening holes will not be squeezed by the beans when they are above, which is more convenient for the reverse falling in the screening holes. At the same time, due to its own rotation, the screening drum will inevitably produce vibration and bumps, and these vibrations and bumps will also clean up the beans in the screening holes and drop them. The screened beans will fall into the peeling and squeezing roller group for squeezing and peeling. The peeled skin will be sucked out, and the bean shells will fall off. Finally, the screened defective products and bean shells are sent out separately. The screening and peeling method combines screening and peeling, saves the intermediate transportation process, reduces space, and can ensure the screening quality and reduce the blockage of the screening holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] Figure 1 is a perspective view of an embodiment of the present invention;

[0021] Figure 2 is a half-sectional view of an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 An enlarged schematic diagram at point A;

[0023] Figure 4 This is a schematic diagram of the structure of the interior of the installation housing according to an embodiment of the present invention;

[0024] Figure 5 is a cross-sectional view of an embodiment of the present invention in which the mounting cover is located at the first screening chamber;

[0025] Figure 6 is a cross-sectional view of the mounting cover located at the second screening chamber according to an embodiment of the present invention;

[0026] In the accompanying drawings: 1. Mounting housing; 2. Screening cylinder; 3. First screening chamber; 4. Second screening chamber; 5. Third screening chamber; 6. Screening hole; 7. Screening spiral blade; 8. Screening feed port; 9. First connecting chamber; 10. Second connecting chamber; 11. Third connecting chamber; 12. Third conveying chamber; 13. Vacuum box; 14. Supporting rotating part; 15. Support bearing; 16. Screening rotary motor; 17. Synchronizing rod; 18. Third guide slope; 19. First squeezing roller; 20. Second extrusion roller; 21. Peeling rotation motor; 22. First screw shaft; 23. Second screw shaft; 24. Conveying spiral blade; 25. First conveying pipe; 26. Second conveying pipe; 27. Second guide slope; 28. First guide slope; 29. First discharge port; 30. Second discharge port; 31. Third screw shaft; 32. Third discharge port; 33. Conveying drive motor; 34. Side ring; 35. Exhaust port; 36. Partition; 37. Pulse blowing pipe; 38. Nozzle; 39. Screen. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below through specific examples.

[0028] like Figures 1 to 6 As shown, a method for screening and peeling grain beans is provided. The screening and peeling method can be used for screening and peeling different grain beans, such as soybeans, black beans, peas, etc. This embodiment takes soybeans as an example. The method includes the following steps:

[0029] S1. Provide a screening and selecting shelling device, including a mounting cover 1, on which a screening drum 2 for screening soybeans is rotatably mounted, the screening drum 2 is divided into a first screening chamber 3, a second screening chamber 4 and a third screening chamber 5, each of which is provided with a screening hole 6, and a screening spiral blade is spirally mounted on the inner wall of the screening drum 2 to push the screening material from the first screening chamber 3 to the third screening chamber 5. The sieve drum 2 is driven to rotate by a sieve rotating power device. The sizes of the sieve holes 6 in the first sieve material chamber 3, the second sieve material chamber 4 and the third sieve material chamber 5 are increased in sequence. The sieve drum 2 is provided with a sieve feed port 8 at the end near the first sieve material chamber 3. The mounting cover 1 covers the sieve drum 2 so that the sieve drum 2 screens and discharges downward. The mounting cover 1 is located below the first sieve material chamber 3, the second sieve material chamber 4 and the third sieve material chamber 5 through a partition opening. The first and second connecting chambers 9, 10 and 11 are connected to each other, and a peeling and squeezing roller group for peeling soybeans is rotatably installed in the third connecting chamber 11, and the peeling and squeezing roller group is driven to rotate by the peeling rotating device. The lower part of the third connecting chamber 11 is connected to the third conveying chamber 12 for conveying the peeled soybeans, and a third spiral conveying structure is provided in the third conveying chamber 12. The first connecting chamber 9 and the second connecting chamber 10 are provided with a first spiral conveying structure and a second spiral conveying structure for directly conveying and discharging the soybeans under the first screening chamber 3 and the second screening chamber 4. The side wall of the mounting cover 1 is provided with an exhaust box 13 for sucking the third screening chamber 5, the third connecting chamber 11 and the third conveying chamber 12, and the suction box is connected to an external suction system. A screen 39 is also provided between the third connecting chamber 12 and the third conveying chamber 13 to facilitate the falling of broken bean petals.

[0030] S2. The screening and shelling device is started, and the soybeans are continuously fed into the screening cylinder 2 from the screening feed port 8; the soybeans are automatically fed by a vacuum feeder, and the soybeans enter the screening cylinder 2 one after another.

[0031] S3: The screening drum 2 rotates. During the rotation, the screening spiral blade 7 rotates with the screening drum 2 and pushes the soybeans from the first screening chamber 3 to the third screening chamber 5. During the pushing process, impurities and defective products pass through the screening holes 6 of the first screening chamber 3 and the second screening chamber 4 and fall into the second connecting chamber 10 and the third connecting chamber 11 and are sent out.

[0032] S4. The screened soybeans pass through the screening holes 6 of the third connecting chamber 11 and continuously fall between the peeling and squeezing rollers to be squeezed and broken. The broken soybean skins are sucked out by the external suction system and the soybeans fall into the third conveying chamber 12 and are sent out.

[0033] Among them, in this embodiment, the first spiral conveying structure and the second spiral conveying structure are both conveying screws, and the two conveying screws are respectively connected to the first extrusion roller and the second extrusion roller of the peeling extrusion roller group to share a peeling rotating device, which can save costs and optimize space.

[0034] The conveying directions of the first spiral conveying structure, the second spiral conveying structure and the third spiral conveying structure are opposite to the screening and conveying direction of the soybeans in the screening drum 2, so that the entire screening length is the length of the entire machine, further shortening the length of the equipment and reducing the floor space.

[0035] The first screening chamber 3 , the second screening chamber 4 and the third screening chamber 5 have the same length.

[0036] The screening and peeling method also includes a cleaning method for cleaning the screening holes 6 of the screening drum 2, by spraying a pulsed airflow from the outside of the screening drum 2 to the screening holes 6 through the nozzle 38. The pulsed airflow will clear the blocked screening holes 6. By using the pulsed airflow to blow the screening holes, the beans in the screening holes 6 can be loosened, thereby cooperating with the roller of the screening drum 2 and the gravity of the beans themselves to clean the screening holes 6 and reduce the blockage of the screening holes 6. The nozzle 38 is located above the screening drum 2. The nozzles 38 are arranged in at least one row in the longitudinal direction of the screening drum 2. Preferably, the nozzles 38 are located directly above the screening drum 2. During the continuous rotation of the screening drum 2, the screening holes 6 on the screening drum 2 will continuously pass under the nozzles 38, so that positive pressure cleaning is continuously performed, thereby performing multiple spray cleanings.

[0037] The external suction system is an exhaust fan, the exhaust port of which is connected to the exhaust box 13 through a dust collector, which can be a cartridge dust collector. The nozzles 38 are spaced apart on the pulse injection pipe 37, which is connected to the compressed gas cylinder.

[0038] In addition, this embodiment discloses the detailed structure of the screening, concentrating and shelling device.

[0039] like Figures 1 to 6As shown, a screening and shelling device comprises a mounting cover 1, on which a screening drum 2 for screening soybeans is rotatably mounted, and the screening drum 2 is divided into a first screening chamber 3, a second screening chamber 4 and a third screening chamber 5, and the first screening chamber 3, the second screening chamber 4 and the third screening chamber 5 are all provided with screening holes 6, and a screening spiral blade 7 is spirally mounted on the inner wall of the screening drum 2 for pushing from the first screening chamber 3 to the third screening chamber 5, and the screening drum 2 is driven to rotate by a screening rotary power device, and the sizes of the screening holes 6 in the first screening chamber 3, the second screening chamber 4 and the third screening chamber 5 increase successively, and a screening feed port 8 is provided at the end of the screening drum 2 near the first screening chamber 3, and the mounting cover 1 covers the screening drum 2 so that the screening drum 2 screens and discharges downward.

[0040] During the rotation of the screening drum 2, the screening spiral blades 7 will push the soybeans and complete the screening while rolling. At the same time, some soybeans may be stuck in the screening holes 6. At this time, since the screening drum 2 is rotating, the screening holes 6 originally at the bottom will be rotated to the top. At this time, the soybeans stuck in the screening holes 6 are in an inverted state, which is conducive to the falling of the soybeans, thereby reducing the blockage of the screening holes 6. In addition, the screening drum 2 itself will also shake to a certain extent during the rotation, which will also shake off the soybeans.

[0041] The first connecting chamber 9, the second connecting chamber 10 and the third connecting chamber 11 are connected to each other through the partition 36 below the first screening chamber 3, the second screening chamber 4 and the third screening chamber 5 in the installation cover 1. A peeling and squeezing roller group for peeling soybeans is rotatably installed in the third connecting chamber 11, and the peeling and squeezing roller group is driven to rotate by the peeling rotating device. The third conveying chamber 12 for conveying the peeled soybeans is connected below the third connecting chamber 11. The third conveying chamber 12 is provided with a third spiral conveying structure. The first connecting chamber 9 and the second connecting chamber 10 are provided with a first spiral conveying structure and a second spiral conveying structure for directly conveying and discharging the soybeans under the screening of the first screening chamber 3 and the second screening chamber 4. An exhaust box 13 for sucking the third screening chamber 5, the third connecting chamber 11 and the third conveying chamber 12 is provided on the side wall of the installation cover 1, and the suction box is connected to an external suction system. A screen 39 is provided between the third connecting chamber 11 and the third conveying chamber 12 to facilitate the falling of the broken bean shells. The screen 39 can facilitate the falling of the broken bean shells while also slowing down the falling of the bean skin to a certain extent. In this way, the light bean skin will be sucked out first at the bottom of the third connecting chamber 11. Of course, if some bean skin falls through the screen into the third conveying chamber 12, it will also be sucked out at the upstream end of the third conveying chamber 12, thereby achieving complete separation of the bean skin and the bean shells.

[0042] like Figure 1 and Figure 2 As shown, support rotating parts 14 are provided at both ends of the screening drum 2, and two support bearings 15 are provided below the support rotating part 14. The support bearings 15 are fixedly mounted on the frame through bearing brackets, and the mounting cover 1 is arranged on the frame. The screening rotation power device includes a screening rotating motor 16, and the screening rotating motor 16 drives one of the support bearings 15 to rotate. The support bearings 15 on the same side of the screening rotating motor 16 are provided with mutually connected synchronization rods 17; both ends of the screening drum 2 are fixed by two support bearings 15 to ensure the stable rotation of the screening drum 2, and the synchronization rod 17 can ensure that the support bearings 15 on the same side of the two ends that drive the screening drum 2 to rotate rotate synchronously and stably, and the support rotating part 14 can effectively block the end of the screening drum 2 to ensure that there is no leakage while feeding.

[0043] A limiting structure for limiting the axial position of the screening drum 2 can also be provided on the frame. The limiting structure can be an annular limiting groove provided on the supporting rotation 14, and the supporting bearing 15 is located in the annular limiting groove, so that the axial limiting can be completed.

[0044] like Figure 2 and Figure 4 As shown, the installation cover 1 is located at the junction of the third screening chamber 5 and the third connecting chamber 11, and is provided with a third guide slope 18 for guiding the screened soybeans to the peeling and squeezing roller group. The peeling and squeezing roller group includes a first squeezing roller 19 and a second squeezing roller 20. The first squeezing roller 19 and the second squeezing roller 20 are parallel and rotated in the same direction as the screening drum 2 in the third connecting chamber 11. The peeling rotating device includes a peeling rotating motor 21. The peeling rotating motor 21 is fixedly installed on the installation cover 1, which drives the first squeezing roller 19 and the second squeezing roller 20 in turn through the transmission structure; the transmission structure is a gear transmission or a transmission. The structure of the dynamic belt transmission ensures that the transmission is stable and reliable. The peeling rotation motor 21 drives the transmission structure to drive the first squeezing roller 19 and the second squeezing roller 20 to rotate relative to each other, so that the bean skin can be squeezed and broken, thereby peeling the soybeans. The third guide slope 18 can ensure the accuracy of the soybean falling. The structure is simple and easy to operate. The third guide slope 18 forms a sealed connection with the mounting cover 1, which can prevent the soybeans from rebounding and falling outward while preparing for guidance; the mounting cover 1 is also provided with an arc-shaped portion annularly surrounding the screening cylinder 2 at the screening cylinder 2 to block it. This can ensure that the screened soybeans can only fall, thereby ensuring the accuracy of screening.

[0045] like Figures 2 to 6As shown, the first squeezing roller 19 and the second squeezing roller 20 are respectively provided with a first spiral shaft 22 and a second spiral shaft 23 that penetrate the third connecting chamber 11 and extend into the second connecting chamber 10 and the first connecting chamber 9 and rotate synchronously. The first spiral shaft 22 and the second spiral shaft 23 are fixedly installed with a conveying spiral blade 24. The first spiral shaft 22 corresponds to spirally conveying the soybeans in the first screening chamber 3, and the second spiral shaft 23 corresponds to spirally conveying the soybeans in the second screening chamber 4. The first spiral shaft 22 and the second spiral shaft 23 are both rotatably installed in the first conveying pipe 25 and the second conveying pipe 26. The second connecting chamber 10 is provided with a second guide slope 27 for guiding the soybeans falling from the second screening chamber to fall into the second conveying pipe 26. The first connecting chamber 9 is provided with a first guide slope 28 for guiding the soybeans falling from the first screening chamber to fall into the first conveying pipe 25. The first conveying pipe 25 and the second conveying pipe 26 both penetrate the first connecting chamber 9 and the second connecting chamber 10. The first conveying pipe 25 and the second conveying pipe 26 are provided with a spiral blade that penetrates the first connecting chamber 9. The first discharge port 29 and the second discharge port 30 of the cover 1 are installed; the first connecting chamber 9 and the second connecting chamber 10 are separated by the partition 36 to ensure that the falling soybeans are accurately classified, but the first spiral shaft 22 and the second spiral shaft 23 will pass through the first connecting chamber 9 and the second connecting chamber 10, so that the soybeans in the first connecting chamber 9 are isolated and guided into the first conveying pipe 25 through the first guide slope 28 to ensure accurate falling of the soybeans. The second guide slope 27 is also the same, and the second conveying pipe 26 can prevent the soybeans screened out in the second screening chamber from being separated. The soybeans fall into the first connecting chamber 9, and the same applies to the first conveying pipe 25. The first spiral shaft 22 and the second spiral shaft 23 are coaxial with the first squeezing roller 19 and the second squeezing roller 20, and share the same power structure, which can reduce power costs. In this way, the first spiral shaft 22 and the second spiral shaft 23 can also be conveyed when the first squeezing roller 19 and the second squeezing roller 20 are squeezing and peeling, ensuring accurate feeding and timely completion of classification and storage. The defective soybeans after screening will be returned for transportation in reverse, which further reduces the length of the entire screening cylinder 2 as a whole, and the overall volume is also smaller.

[0046] In this embodiment, the third spiral conveying structure includes a third spiral shaft 31, on which a spiral blade cooperating with the third conveying chamber 12 is fixedly mounted, and the bottom of the third conveying chamber 12 is U-shaped, and the mounting cover 1 is provided with a third discharge port 32 that is connected through the third conveying chamber 12, and the third spiral shaft 31 is driven to rotate by a conveying drive motor 33, and the conveying drive motor 33 is fixedly mounted on the side wall at one end of the mounting cover 1; driving the third spiral shaft 31 to rotate by the conveying drive motor 33 can effectively push the soybeans falling from the third connecting chamber 11, and the third conveying chamber 12 with a U-shaped bottom can ensure that the soybeans are effectively gathered, so that the spiral blades of the third spiral shaft 31 can push the soybeans to be transported accurately and stably.

[0047] like Figure 2 As shown, the supporting rotating part 14 on the screening drum 2 located at the screening feed port 8 is a cylindrical tube, and the cylindrical tube is provided with an opening connected to the screening drum 2, and a retaining ring 34 is provided at the connection between the cylindrical tube and the screening feed port 8 of the screening drum 2; since the screening drum 2 needs to be continuously rotated to allow the soybeans to be moved and screened, the cylindrical tube can facilitate the insertion of the feed hopper without affecting the rolling of the screening drum 2, so that the soybeans can accurately fall into the screening drum 2, and the retaining ring 34 can prevent the soybeans from rolling out, thereby ensuring accurate feeding.

[0048] In this embodiment, the first discharge port 29 and the second discharge port 30 and the conveying drive motor 33 are located on the side wall of the mounting cover 1 near one end of the first screening chamber, and the vacuum box 13 and the peeling rotating motor 21 are fixedly mounted on the side wall of the mounting cover 1 near one end of the third screening chamber. The vacuum box 13 is provided with two vacuum ports 35, which correspond to the connection between the third screening chamber and the third connecting chamber 11 and the connection between the third connecting chamber 11 and the third conveying chamber 12; in order to ensure accurate screening, classification and storage of peeled soybeans, the removed bean skins need to be collected, so the vacuum port 35 needs to be as close to the third screening chamber as possible to ensure that the soybeans are close to the vacuum port 35 when falling, and the suction effect is best. At the same time, it does not affect the installation of other structures. The vacuum port can not only suck the peeled bean skins, but also suck some scattered light impurities in the screening drum 2.

[0049] like Figure 3 As shown, a pulse blowing pipe 37 is installed above the screening drum in the installation cover 1, and the pulse blowing pipe 37 extends axially to cover the first screening material chamber, the second screening material chamber and the third screening material chamber. A plurality of nozzles 38 for spraying the screening drum are provided at the bottom of the pulse blowing pipe 37, and the compressed gas cylinder is connected to the pulse blowing pipe 37.

[0050] The positive pressure outlet end of the external suction system is connected to the dust collector. The external suction system is an exhaust fan. The dust collector is preferably a filter cartridge dust collector. Several nozzles 38 spray the screening drum 2 from the outside. Then, during the rotation of the screening drum 2, some screening holes that may be partially blocked will be hit by the pulse airflow sprayed by the nozzle when they rotate upward. During the continuous rotation of the screening drum 2, the blocked screening holes will continue to pass through the pulse airflow area, and the soybeans in the blocked screening holes 6 will face downward. The screening holes 6 will be cleaned under the influence of the soybeans' own gravity and the pulse-blown airflow, thereby avoiding blockage of the screening holes.

[0051] The working principle of this embodiment is as follows: first, the material is fed through the hopper, and the feeding pipe of the vacuum loader will extend from the screening feed port 8 into the first screening chamber, and then the screening rotating motor 16 drives the support bearing 15 to rotate, and at the same time transmits it to the support bearing 15 at the other end through the synchronization rod 17 for synchronization, the screening drum 2 starts to rotate, the vacuum loader continuously feeds, the screening drum 2 continuously screens, and the screening spiral blade 7 drives the soybean to move to the third screening chamber 5, and the third screening chamber 5 falls. The peeling rotating motor 21 drives the gear transmission structure to transmit to the first squeezing roller 19 and the second squeezing roller 20 to extrude and peel the soybean, and then falls to the third conveying chamber 12, and the third spiral shaft 31 is driven by the conveying drive motor 33 to rotate, driving the spiral blade to screen The peeled soybeans are transported to the third discharge port 32 for collection or direct transportation to downstream equipment in the refining process. At the same time, the suction system sucks the dust, impurities and bean skins generated during the processing of the third screening chamber 5, the third connecting chamber 11 and the third conveying chamber 12 through the vacuum box 13. After the soybeans falling from the first screening chamber 3 and the second screening chamber 4 enter the first connecting chamber 9 and the second connecting chamber 10, the first screw shaft 22 and the second screw shaft 23 are synchronously driven to rotate while the first squeezing roller 19 and the second squeezing roller 20 are peeling, driving the soybeans in the corresponding first connecting chamber 9 and the second connecting chamber 10 to be discharged from the first discharge port 29 and the second discharge port 30 for classified output and storage.

[0052] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for screening and peeling grain beans, characterized in that: The following steps are involved: S1. Provide a screening, selecting and shelling device, comprising an installation cover, on which a screening drum for screening soybeans is rotatably installed, wherein the screening drum is divided into a first screening chamber, a second screening chamber and a third screening chamber, and the first screening chamber, the second screening chamber and the third screening chamber are all provided with screening holes, and a screening spiral blade is spirally installed on the inner wall of the screening drum, which pushes it from the first screening chamber to the third screening chamber, and the screening drum is driven to rotate by a screening rotating power device, and the sizes of the screening holes in the first screening chamber, the second screening chamber and the third screening chamber increase successively, and a screening feed port is provided at the end of the screening drum near the first screening chamber, and the installation cover covers the screening drum so that the screening drum screens and discharges materials downward, and a partition is provided below the first screening chamber, the second screening chamber and the third screening chamber in the installation cover. A first connecting chamber, a second connecting chamber and a third connecting chamber are provided which are connected to each other, wherein a peeling and squeezing roller group for peeling soybeans is rotatably installed in the third connecting chamber, and the peeling and squeezing roller group is driven to rotate by the peeling rotating device. The lower part of the third connecting chamber is connected to a third conveying chamber for conveying the peeled soybeans, and a third conveying chamber is provided with a third spiral conveying structure, and the first connecting chamber and the second connecting chamber are provided with a first spiral conveying structure and a second spiral conveying structure for directly conveying and discharging the soybeans under the first screening chamber and the second screening chamber. An exhaust box for sucking the third screening chamber, the third connecting chamber and the third conveying chamber is provided on the side wall of the mounting cover, and the suction box is connected to an external suction system, and a screen is also provided between the third connecting chamber and the third conveying chamber to facilitate the falling of crushed bean petals. S2, the screening and shelling device is started, and the soybeans are continuously fed into the screening cylinder from the screening feed port; S3. The screening drum rotates. During the rotation, the screening spiral blade rotates with the screening drum and pushes the soybeans from the first screening chamber to the third screening chamber. During the pushing process, impurities and defective products pass through the screening holes of the first and second screening chambers and fall into the second and third connecting chambers and are sent out. S4. The screened soybeans pass through the screening holes of the third connecting chamber and continuously fall between the peeling and squeezing rollers to be squeezed and broken. The broken soybean skins are sucked out by the external suction system and the soybeans fall into the third conveying chamber and are sent out.

2. The method for screening and peeling grain beans according to claim 1, wherein: The first spiral conveying structure and the second spiral conveying structure are both conveying screws, and the two conveying screws are respectively connected to the first squeezing roller and the second squeezing roller of the peeling squeezing roller group to share a peeling rotating device.

3. A method for screening and peeling grain beans according to claim 2, characterized in that: The conveying directions of the first spiral conveying structure, the second spiral conveying structure and the third spiral conveying structure are opposite to the screening and conveying direction of the soybeans in the screening drum.

4. A method for screening and peeling grain beans according to claim 3, characterized in that: The first screening material chamber, the second screening material chamber and the third screening material chamber have the same length.

5. The method for screening and peeling grain beans according to claim 1, wherein: In step S2, the soybeans are fed into the screening cylinder using a vacuum loader.

6. The method for screening and peeling grain beans according to claim 1, wherein: The screening and peeling method also includes a cleaning method for cleaning the screening holes of the screening cylinder, wherein a pulse airflow is sprayed from the outside of the screening cylinder to the screening holes through a nozzle, and the pulse airflow clears the blocked screening holes.

7. A method for screening and peeling grain beans according to claim 6, characterized in that: The nozzles are located above the screening drum and are arranged in at least one row in the longitudinal direction of the screening drum.

8. The method for screening and peeling grain beans according to claim 7, wherein: The external suction system is an exhaust fan, the exhaust port of the exhaust fan is connected to the exhaust box through a dust collector, the nozzles are arranged at intervals on the pulse blowing pipe, and the pulse blowing pipe is connected to the compressed gas cylinder.

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