A cotton seed pretreatment and screening system

Abstract

The utility model discloses a kind of cottonseed pretreatment screening systems, belong to cottonseed processing technical field, including raw material processing system, with the raw material processing system is connected cotton kernel screening system and cotton shell cleaning and recovery system;The cotton shell cleaning and recovery system with the cotton kernel screening system and the raw material processing system are all connected;The raw material processing system is used to clean, condition and crush to light cottonseed;The cotton kernel screening system is used to screen after the cottonseed mixture of crushing, to obtain pure cotton kernel;The cotton shell cleaning and recovery system is used to handle the cotton shell after the cotton kernel screening system handles, further the cottonseed or cotton kernel in cotton shell is fully cleaned and recovered into system.The utility model can completely distinguish pure cotton kernel and cotton shell, the cotton kernel obtained contains shell no more than 3%, cotton shell contains kernel no more than 0.3%, applied to big line production, can be prepared to obtain the dephenolated cottonseed concentrated protein of crude protein content greater than 60%.

Description

Technical Field

[0001] This utility model relates to the technical field of cottonseed processing equipment, and in particular to a cottonseed pretreatment screening system. Background Technology

[0002] my country is a major cotton grower, producer, and processor, and the utilization of cottonseed and its by-products is becoming increasingly widespread. Among these, cottonseed protein is a good source of edible and feed protein, which can, to some extent, fill the gap in protein resources. With the gradual improvement of cottonseed deep-processing equipment and production technology, cottonseed concentrated protein products with crude protein levels of over 60% have experienced rapid development.

[0003] Producing cottonseed protein concentrate with a crude protein content of over 60% places extremely high demands on the pretreatment and screening process of cottonseed.

[0004] Chinese invention patent CN116764962A discloses a pretreatment system for the production and processing of dephenolized cottonseed protein. The system separates cottonseeds by size and removes the husks. Through a step-by-step and process-by-process, the delinted cottonseeds are screened, crushed, impurities removed, and selected to obtain pure cotton kernels. This method mainly focuses on the fine processing of cotton kernels, using photoelectric equipment such as color sorters. The processing capacity is small, and it does not mention the recovery of light-colored seeds with a smaller specific gravity mixed in the cotton husks.

[0005] Chinese utility model patent with publication (announcement) number CN207479001U discloses a device for separating the kernel and husk of cottonseed after hulling. It performs joint sorting of kernel and husk from multiple aspects such as particle size, specific gravity, and shape to achieve multi-level screening of materials. However, the air screening machine used has low capacity, high failure rate, and the kernel content of cottonseed husk cannot be guaranteed to be controlled below 0.3%.

[0006] Chinese utility model patent with publication number CN218424136U discloses a cottonseed kernel re-separation device for the discharge of cottonseed hulls. This device performs secondary fine screening on the already screened cottonseed hull and kernel mixture to improve the screening rate of cottonseed kernels and avoid material waste. Although this device screens the material multiple times and improves the cleanliness of the material, it can only further refine a small portion of the material in the screening process.

[0007] In summary, there are many types of cottonseed pretreatment screening equipment or systems, but very few can completely separate cotton kernels and hulls and be stably used in large production lines. Most are only suitable for small production lines, or have high equipment failure rates, or have cotton hulls containing a lot of kernels, resulting in low protein product yield.

[0008] Therefore, it is necessary to develop a screening system that is suitable for large-scale continuous and stable production, has a simple process, requires little investment, and has good implementation results. Utility Model Content

[0009] The technical problem to be solved by this utility model is to provide a cottonseed pretreatment screening system that can completely distinguish between pure cotton kernels and cotton hulls, so that the obtained cotton kernels contain no more than 3% hulls and the cotton hulls contain no more than 0.3% kernels. When applied to large-scale production, it can produce cottonseed protein concentrate with a crude protein content of more than 60%.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0011] A cottonseed pretreatment screening system includes a raw material processing system, a cotton kernel screening system connected to the raw material processing system, and a cotton hull cleaning and recycling system; the cotton hull cleaning and recycling system is connected to both the cotton kernel screening system and the raw material processing system.

[0012] The raw material processing system is used for cleaning, conditioning, and crushing light cottonseeds;

[0013] The cottonseed sieving system is used to sieve the crushed cottonseed mixture to obtain pure cottonseed.

[0014] The cotton hull cleaning and recycling system is used to process the cotton hulls after the cotton kernel screening system, and further cleans and recycles the cotton seeds or kernels in the cotton hulls into the system.

[0015] A further improvement of this utility model's technical solution is that: the raw material processing system includes a grate screen, a conditioning machine, and a shelling machine; the shelling machine includes a blade shelling machine and a double-roller shelling machine;

[0016] The discharge port of the grate screen is directly connected to the inlet of the conditioning machine, the discharge port of the conditioning machine is connected to the feed auger of the blade huller, and the discharge auger of the blade huller is connected to the feed auger of the cotton kernel screening system; the feed auger of the roller huller is connected to the return port of the cotton hull cleaning and recycling system, and the discharge auger of the roller huller is connected to the feed auger of the cotton kernel screening system.

[0017] A further improvement of this utility model is that: the grate screen is provided with two layers of screen plates, the first layer of screen plates has a hole diameter of 5-6mm, and the second layer of screen plates has a hole diameter of 1.0-1.5mm; the several stirring blades provided inside the grate screen are rod-shaped, and several fan-shaped small teeth are provided on some of the stirring blades; an exhaust pipe for treating floating fibers and soil impurities in the raw materials is provided above the grate screen.

[0018] A further improvement of the present invention is that the cotton kernel screening system includes a grading screen, a distributor, a cotton kernel sorting device, and a rotary screen.

[0019] The cotton kernel sorting device includes a large kernel sorting device and a crushed kernel sorting device;

[0020] The rotary screen includes a No. 1 rotary screen connected to the kernel sorting device and a No. 2 rotary screen connected to the kernel crushing device.

[0021] The feed inlet of the grading screen is connected to the discharge outlet of the raw material processing system, and the discharge outlet of the grading screen is connected to the feed inlet of the cotton hull cleaning and recycling system and the feed inlet of the distributor, respectively.

[0022] The distributor uses the difference in material specific gravity and aperture size to separate cotton kernel material into seed husk material, cotton kernel material, and broken powder material; the outlet of the seed husk material is connected to the inlet of the cotton husk cleaning and recycling system, the outlet of the cotton kernel material is connected to the inlet of the large kernel separator, and the outlet of the broken powder material is connected to the inlet of the broken kernel separator.

[0023] A further improvement of this utility model is that: the three-layer sieve plate of the grading and screening is used to coarsely screen cotton kernel materials, and each layer of sieve plate is equipped with a vibrator on its side that can clean the sieve plate regularly.

[0024] A further improvement of this utility model is that: the kernel sorter and the crushed kernel sorter have the same structure, both being three-layer structures. Each layer has a negative pressure air inlet at the top, a blower inlet and a blower in the middle of each layer, and a bar-type feeding roller above the blower inlet; a first feed inlet is provided above the first layer, and a cotton hull outlet and a cotton kernel outlet are provided below the third layer.

[0025] The frequency of each blower is adjusted according to the state of the material. By adjusting the blower's air volume and the force of the bar-type feed roller, the cotton kernels containing husks are separated into selected cotton kernels, mixed material, and light impurities containing powder. The selected cotton kernels fall directly into the finished product collection, the mixed material falls into the rotary screen for further processing, and the light impurities containing powder are removed.

[0026] A further improvement of the present invention is that the cotton hull cleaning and recycling system includes a cotton hull suction device and a cotton hull screening machine.

[0027] The inlet of the cotton hull extractor is connected to the outlet of the grading screen and distributor in the cotton kernel screening system, and the outlet of the cotton hull extractor is connected to the inlet of the cotton hull screening machine and the feed auger of the roller shelling machine in the raw material processing system.

[0028] The discharge port of the cotton hull screening machine is connected to the feed auger of the roller peeling machine and the feed port of the cotton hull silo in the raw material processing system.

[0029] A further improvement of this utility model is that the cotton hull screening machine has a double auger structure, with an upper auger and a lower auger arranged in parallel inside the shell, and a screen between the upper auger and the lower auger. A second feed inlet is provided on one side of the upper shell, and an undersize outlet is provided on the other side of the lower shell. Several bars of different lengths are provided on the upper auger, and the bars are arranged in a staggered spiral. An oversize outlet connected to an elevator is provided on the upper side of the screen.

[0030] After entering through the second feed inlet, the cotton hulls are pushed and fully broken up. The broken kernels and fine powders after passing through the lower screen fall into the lower auger and are conveyed to the undersize outlet, returning to the roller shelling machine for further processing. The cotton hulls after being filtered through the screen are sent to the cotton hull storage by the elevator through the oversize outlet.

[0031] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0032] 1. This utility model, by adding a cotton hull cleaning and recycling system and adjusting the connection relationship between various equipment, and improving the grate screen structure in the raw material processing system, the cotton kernel separator structure in the cotton kernel screening system, and the cotton hull screening machine structure in the cotton hull cleaning and recycling system, can efficiently separate cotton kernels and cotton hulls, minimizing the hull content of cotton kernels, thereby greatly increasing the content of dephenolized cottonseed protein. It can obtain clean cotton kernels and cotton hulls, with cotton kernels containing no more than 3% hulls and cotton hulls containing no more than 0.3% kernels. It can be used to produce cottonseed concentrated protein with a crude protein content of more than 60%, with no waste discharge.

[0033] 2. This utility model equipment is simple, easy to operate, highly practical, requires little investment, is suitable for large-scale production, and is easy to realize continuous industrial production. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a cottonseed pretreatment screening system provided in an embodiment of this utility model;

[0036] Figure 2 This is a cross-sectional view of the grate screen portion in an embodiment of this utility model;

[0037] Figure 3 This is a structural schematic diagram of the kernel sorting device and the kernel crushing device in this embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the internal structure of the cotton hull screening machine in an embodiment of this utility model;

[0039] Among them, 1. stirring blades; 2. fan-shaped small teeth; 3. first feed inlet; 4. first negative pressure air inlet; 5. second negative pressure air inlet; 6. third negative pressure air inlet; 7. cotton hull outlet; 8. cotton kernel outlet; 9. first blower air inlet; 10. first feeding roller; 11. second blower air inlet; 12. second feeding roller; 13. third blower air inlet; 14. third feeding roller; 15. second feed inlet; 16. shell; 17. upper auger; 17-1. bar; 18. screen; 19. lower auger; 20. oversize outlet; 21. undersize outlet. Detailed Implementation

[0040] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0044] like Figure 1As shown, a cottonseed pretreatment screening system includes a raw material processing system, a cotton kernel screening system connected to the raw material processing system, and a cotton hull cleaning and recycling system; the cotton hull cleaning and recycling system is connected to both the cotton kernel screening system and the raw material processing system.

[0045] The raw material processing system is used for cleaning, conditioning, and crushing light cottonseeds;

[0046] The cottonseed sieving system is used to sieve the crushed cottonseed mixture to obtain pure cottonseed.

[0047] The cotton hull cleaning and recycling system is used to process cotton hulls after the cotton kernel screening system, further cleaning and recycling the cotton seeds or kernels in the cotton hulls back into the system.

[0048] Furthermore, the raw material processing system includes a grate screen, a conditioning machine, and a shelling machine; the shelling machine includes a blade shelling machine and a double-roller shelling machine.

[0049] The discharge port of the grate screen is directly connected to the inlet of the conditioner, the discharge port of the conditioner is connected to the feed auger of the blade huller, and the discharge auger of the blade huller is connected to the feed auger of the cotton kernel screening system; the feed auger of the roller huller is connected to the return port of the cotton hull cleaning and recycling system, and the discharge auger of the roller huller is connected to the feed auger of the cotton kernel screening system.

[0050] When the moisture content of cottonseed raw materials is too low, the conditioner is turned on to adjust the moisture content before entering the system, reducing powder generation. The blade huller is used to remove large kernels and reduce powder generation; the roller huller is used to process the return material from the cottonseed hull extractor in the cottonseed hull cleaning and recycling system, and to crush the smooth cottonseed in the return material.

[0051] Furthermore, such as Figure 2 As shown, the grate screen has two layers of screen plates. The first layer of screen plates has a hole diameter of 5-6 mm, and the second layer of screen plates has a hole diameter of 1.0-1.5 mm. The grate screen has several rod-shaped stirring blades 1. Several fan-shaped teeth 2 are set on some of the stirring blades 1. The stirring blades 1 with fan-shaped teeth 2 need to be spaced at least two stirring blades 1 apart. An exhaust pipe is set above the grate screen to remove floating fibers and soil impurities from the raw material (light cottonseed).

[0052] Furthermore, the cotton kernel screening system includes a grading screen, a distributor, a cotton kernel separator, and a rotary screen;

[0053] Cotton kernel sorting machines include large kernel sorting machines and broken kernel sorting machines;

[0054] The rotary screen includes a No. 1 rotary screen connected to the kernel sorting device and a No. 2 rotary screen connected to the crushed kernel sorting device;

[0055] The feed inlet of the grading screen is connected to the discharge outlet of the raw material processing system, and the discharge outlet of the grading screen is connected to the feed inlet of the cotton husk cleaning and recycling system and the feed inlet of the distributor, respectively.

[0056] The distributor uses the differences in material specific gravity and aperture size to separate cottonseed material into seed husk material, cottonseed material, and broken powder material. The outlet of the seed husk material is connected to the inlet of the cottonseed husk cleaning and recycling system, the outlet of the cottonseed material is connected to the inlet of the large kernel separator, and the outlet of the broken powder material is connected to the inlet of the broken kernel separator.

[0057] Specifically, the separator divides the hulled cotton kernels into three parts for separate processing. The upper layer of seed hull material enters the cotton hull extractor for processing; the middle layer of cotton kernel material, which consists of damaged cotton kernels, enters the large kernel separator for processing; and the lower layer, which consists of broken powder material with a diameter of less than 3mm, enters the broken kernel separator for processing.

[0058] Furthermore, the cottonseed material is coarsely screened using three layers of sieves (upper, middle, and lower). Each sieve layer is equipped with a vibrator on its side for periodic cleaning.

[0059] Furthermore, such as Figure 3 As shown, the kernel sorter and the crushed kernel sorter have the same structure, both being three-layer structures. A first feed inlet 3 is provided on one side above the first layer, a first negative pressure suction port 4 is provided on the other side above the first layer, a first blower inlet 9 and a first blower are provided in the middle of the first layer, and a first feeding roller 10 is provided above the first blower inlet 9.

[0060] A second negative pressure air intake 5 is provided above the second layer, a second blower air inlet 11 and a second blower are provided in the middle of the second layer, and a second feeding roller 12 is provided above the second blower air inlet 11.

[0061] A third negative pressure air intake 6 is provided above the third layer, a third blower air inlet 13 and a third blower are provided in the middle of the third layer, and a third feeding roller 14 is provided above the first blower air inlet 13.

[0062] A cotton hull outlet 7 is provided on one side below the third layer; a cotton kernel outlet 8 is provided on the other side below the third layer.

[0063] The frequency of each blower (first blower, second blower, and third blower) is adjusted according to the material state. Utilizing the differences in material specific gravity, the blower airflow and the parabolic force of the bar-type feed rollers (first feed roller 10, second feed roller 12, and third feed roller 14) are adjusted. After three air classifications, the hulled cotton kernels are separated into selected cotton kernels, mixed material, and light impurities containing powder. The classification of hulled cotton kernels of different particle sizes greatly improves the screening effect. The mixed material enters the No. 1 rotary screen connected to the large kernel separator and the No. 2 rotary screen connected to the crushed kernel separator for further processing. The light impurities containing powder are sucked away by the first negative pressure suction port 4, the second negative pressure suction port 5, and the third negative pressure suction port 6.

[0064] Furthermore, the cotton hull cleaning and recycling system includes a cotton hull extractor and a cotton hull screening machine;

[0065] The feed inlet of the cotton hull extractor is connected to the discharge outlet of the grading screen and distributor in the cotton kernel screening system. The discharge outlet of the cotton hull extractor is connected to the feed inlet of the cotton hull screening machine and the feed auger of the roller shelling machine in the raw material processing system.

[0066] The discharge port of the cotton hull screening machine is connected to the feed auger of the roller hulling machine and the feed port of the cotton hull silo in the raw material processing system.

[0067] Specifically, the cotton hull extractor receives the oversize material from the grading screen and the seed hulls from the distributor. Utilizing the difference in material specific gravity, the air volume is adjusted to draw the cotton hulls into the cotton hull screening machine. Cotton kernels or bare cotton seeds fall from the bottom of the cotton hull extractor cavity due to gravity and return to the roller dehulling machine for further processing. The cotton hulls entering the screening machine utilize the different material sizes and are equipped with screens of different apertures to recover lighter fragments and fine powder mixed in with the cotton hulls, resulting in a higher quality cotton hull product. The undersize material from the cotton hull screening machine returns to the roller dehulling machine for further processing.

[0068] Furthermore, such as Figure 4 As shown, the cotton hull screening machine has a double auger structure. An upper auger 17 and a lower auger 19 are arranged in parallel inside the housing 16. A screen 18 is placed between the upper and lower augers 17 and 19. A second feed inlet 15 is located on one side of the upper part of the housing 16, and an undersize outlet 21 is located on the other side of the lower part of the housing 16. Several bars 17-1 of varying lengths are arranged on the upper auger 17 in a staggered spiral arrangement. An oversize outlet 20, connected to an elevator, is located on the upper side of the screen 18.

[0069] After entering through the second feed inlet 15, the cotton hulls are pushed and fully dispersed. The broken kernels and fine powders after passing through the lower screen 18 fall into the lower auger 19 and are conveyed to the undersize outlet 21 to return to the roller shelling machine for further processing. The cotton hulls filtered through the screen 18 are sent to the cotton hull storage by the elevator through the oversize outlet 20.

[0070] Furthermore, after cottonseed is processed through a cottonseed pretreatment screening system, the resulting cotton kernel contains no more than 3% hull and the cotton hull contains no more than 0.3% kernel. When used as feedstock to produce dephenolized cottonseed protein, dephenolized cottonseed concentrated protein with a crude protein content of over 60% can be obtained.

[0071] A process flow for a cottonseed pretreatment and screening system includes the following:

[0072] After delinting, the cottonseed, containing 3%-4% down, is fed into the cottonseed pretreatment screening system via a conveyor auger. The raw material processing system controls the cottonseed feed rate at 15 tons / hour. Due to the controlled low down content, the cottonseed contains a small amount of fine powder; the material passing through a 16-mesh sieve accounts for 3%-5%, and the moisture content is 8%. The two screen plates of the grate sieve have apertures of 3mm and 4mm respectively, removing the fine powder and impurities mixed in with the cottonseed. After being processed by the grate sieve, the cottonseed enters the conditioning machine, where steam is introduced to adjust the moisture content to 10%, which reduces the generation of fine powder during the dehulling process.

[0073] After conditioning, the cottonseed enters the blade hulling machine. Depending on the cottonseed's origin and size, the distance between the moving and fixed rollers is adjusted to 2.8mm-3.6mm. After hulling, the seeds fall into a conveyor auger and are transported to the cotton kernel screening system. First, they undergo coarse screening using a grading screen with mesh sizes of 3mm-5mm-5mm from top to bottom. There are two outlets below the grading screen: one for cottonseed hulls containing kernels, and one for cottonseed kernels containing hulls. The cottonseed kernels containing hulls enter a distributor via the conveyor auger. The distributor has two layers: the upper layer has a mesh size of 5mm-5.5mm, and the lower layer has a mesh size of 3mm-3.5mm. The distributor separates the cottonseed kernels into three parts for further processing: the upper layer of seed hulls is processed by a hull extractor; the middle layer of cottonseed kernels, consisting of broken kernels, is processed by a large kernel separator; and the lower layer, consisting of broken kernels less than 3mm in diameter, is processed by a broken kernel separator. The No. 1 rotary screen for the large-kernel separator has a screen aperture of 5mm, while the No. 2 rotary screen for the crushed-kernel separator has a screen aperture of 3mm. Lighter cotton hull mixtures fall onto either the No. 1 or No. 2 rotary screen for processing. The cotton kernels processed by the large-kernel separator, crushed-kernel separator, No. 1 rotary screen, and No. 2 rotary screen enter the finished cotton kernel storage. Light impurities containing powder enter the cotton hull cleaning and recycling system. The finished cotton kernels after processing have a hull content of 2%-3%.

[0074] Cotton hulls containing kernels, after being graded and screened, enter the cotton hull cleaning and recycling system. The cotton hull extractor utilizes the difference in material specific gravity; by adjusting the airflow, the cotton hulls are sucked away. The cotton kernels or bare cottonseeds, due to gravity, fall from the bottom of the extractor cavity and return to the roller hulling machine for further processing. A portion of the cotton hulls sucked away by the extractor enters the cotton hull screening machine. The screening machine has screen apertures of 2.5mm, 3mm, and 4mm. Utilizing the different material sizes, the screening machine uses screens with different apertures to recover lighter kernel fragments and fine powder mixed in with the cotton hulls, resulting in a higher quality cotton hull product with a kernel content of 0.2%-0.3%.

[0075] Finally, cottonseeds with a hull content of 2%-3% are fed into the production line at a rate of 8 tons / hour. After continuous processing through softening, rolling, leaching, and steaming, the resulting dephenolized cottonseed protein is golden in color, with a moisture content of 5%, a crude protein content of 60.2%, a free gossypol content of 250 mg / kg, and an oil content of 0.4%.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cottonseed pretreatment and screening system, characterized in that: It includes a raw material processing system, a cotton kernel screening system connected to the raw material processing system, and a cotton hull cleaning and recycling system; the cotton hull cleaning and recycling system is connected to both the cotton kernel screening system and the raw material processing system. The raw material processing system is used for cleaning, conditioning, and crushing light cottonseeds; The cottonseed sieving system is used to sieve the crushed cottonseed mixture to obtain pure cottonseed. The cotton hull cleaning and recycling system is used to process the cotton hulls after the cotton kernel screening system, and further cleans and recycles the cotton seeds or kernels in the cotton hulls into the system.

2. The cottonseed pretreatment and screening system according to claim 1, characterized in that: The raw material processing system includes a grate screen, a conditioning machine, and a shelling machine; the shelling machine includes a blade shelling machine and a double-roller shelling machine. The discharge port of the grate screen is directly connected to the inlet of the conditioning machine, the discharge port of the conditioning machine is connected to the feed auger of the blade huller, and the discharge auger of the blade huller is connected to the feed auger of the cotton kernel screening system; the feed auger of the roller huller is connected to the return port of the cotton hull cleaning and recycling system, and the discharge auger of the roller huller is connected to the feed auger of the cotton kernel screening system.

3. The cottonseed pretreatment and screening system according to claim 2, characterized in that: The grate screen is provided with two layers of screen plates. The aperture of the first layer of screen plate is 5-6 mm, and the aperture of the second layer of screen plate is 1.0-1.5 mm. The several stirring blades (1) provided in the grate screen are rod-shaped, and several fan-shaped small teeth (2) are provided on some of the stirring blades (1). An exhaust pipe for treating floating fibers and soil impurities in the raw materials is provided above the grate screen.

4. The cottonseed pretreatment and screening system according to claim 1, characterized in that: The cotton kernel screening system includes a grading screen, a feeder, a cotton kernel separator, and a rotary screen; The cotton kernel sorting device includes a large kernel sorting device and a crushed kernel sorting device; The rotary screen includes a No. 1 rotary screen connected to the kernel sorting device and a No. 2 rotary screen connected to the kernel crushing device. The feed inlet of the grading screen is connected to the discharge outlet of the raw material processing system, and the discharge outlet of the grading screen is connected to the feed inlet of the cotton hull cleaning and recycling system and the feed inlet of the distributor, respectively. The distributor uses the difference in material specific gravity and aperture size to separate cotton kernel material into seed husk material, cotton kernel material, and broken powder material; the outlet of the seed husk material is connected to the inlet of the cotton husk cleaning and recycling system, the outlet of the cotton kernel material is connected to the inlet of the large kernel separator, and the outlet of the broken powder material is connected to the inlet of the broken kernel separator.

5. The cottonseed pretreatment screening system according to claim 4, characterized in that: The grading and screening system has three layers of screen plates (upper, middle, and lower) for coarse screening of cotton kernels. Each layer of screen plate is equipped with a vibrator on its side for periodic cleaning.

6. The cottonseed pretreatment screening system according to claim 4, characterized in that: The large kernel selector and the crushed kernel selector have the same structure, both being three-layer structures. Each layer has a negative pressure air inlet at the top, a blower inlet and a blower in the middle of each layer, and a bar-type feeding roller above the blower inlet. A first feed inlet (3) is provided above the first layer, and a cotton hull outlet (7) and a cotton kernel outlet (8) are provided below the third layer. The frequency of each blower is adjusted according to the state of the material. By adjusting the blower's air volume and the force of the bar-type feed roller, the cotton kernels containing husks are separated into selected cotton kernels, mixed material, and light impurities containing powder. The selected cotton kernels fall directly into the finished product collection, the mixed material falls into the rotary screen for further processing, and the light impurities containing powder are removed.

7. The cottonseed pretreatment and screening system according to claim 1, characterized in that: The cotton hull cleaning and recycling system includes a cotton hull extractor and a cotton hull screening machine; The inlet of the cotton hull extractor is connected to the outlet of the grading screen and distributor in the cotton kernel screening system, and the outlet of the cotton hull extractor is connected to the inlet of the cotton hull screening machine and the feed auger of the roller shelling machine in the raw material processing system. The discharge port of the cotton hull screening machine is connected to the feed auger of the roller peeling machine and the feed port of the cotton hull silo in the raw material processing system.

8. The cottonseed pretreatment screening system according to claim 7, characterized in that: The cotton hull screening machine has a double auger structure. An upper auger (17) and a lower auger (19) are arranged in parallel inside the shell (16). A screen (18) is arranged between the upper auger (17) and the lower auger (19). A second feed inlet (15) is provided on one side above the shell (16), and an undersize outlet (21) is provided on the other side below the shell (16). Several bars (17-1) of different lengths are provided on the upper auger (17), and the bars (17-1) are arranged in a staggered spiral. An oversize outlet (20) connected to the elevator is provided on the upper side of the screen (18). After entering through the second feed inlet (15), the cotton hulls are pushed and fully dispersed. The broken kernels and fine powders after passing through the lower screen (18) fall into the lower auger (19) and are transported to the undersize outlet (21) to be returned to the roller shelling machine for further processing. The cotton hulls filtered through the screen (18) are sent to the cotton hull storage by the elevator through the oversize outlet (20).

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