Multi-stage corn germ extraction system and process

Abstract

The invention relates to a multistage corn germ extraction system and process. The system comprises a grain purification treatment system, a preliminary breaking and cooking germ extraction system and a fine breaking and cooking germ extraction system, the preliminary breaking and cooking germ extraction system comprises a preliminary breaking and cooking machine, a large-particle-size screening machine and a large-particle-size color selector and is used for performing preliminary breaking and cooking on corn kernels and screening out large-particle-size materials, so that germs are preliminarily separated, large-particle-size germs are selected from large particles, and the rest large-particle-size materials are output to the fine breaking and cooking system for secondary breaking and cooking; the fine breaking and cooking system comprises a fine breaking and cooking machine, a small-particle-size screening machine and a small-particle-size color sorter, and is used for performing fine breaking and cooking on small particles and screening out small-particle-size materials, so that germs are further separated, small-particle-size germs are selected from the small particles, and the rest small-particle-size materials are output into a specific gravity germ extraction machine for secondary germ extraction; according to the method, large-particle-size germs with relatively high integrity can be obtained, and the germ extraction rate can be improved, so that the obtained corn dreg products and germ products have relatively high purity.

Description

Technical Field

[0001] The invention relates to the technical field of corn processing, and in particular to a multi-stage corn germ extraction system and process. Background Art

[0002] At present, the commonly used germ extraction process mostly adopts dry processing. After simply crushing with a crusher, the germ is extracted by gravity air separation, which results in low germ integrity and low germ yield. This leads to, on the one hand, low germ integrity and a large content of fine endosperm particles in the germ product, which makes it difficult to remove the fine endosperm particles in the subsequent process, affecting the color and taste of the finished germ product, reducing the economic value of the finished germ product, and low germ purity. It cannot be directly eaten as a pure material after processes such as cooking or frying. On the other hand, due to the low integrity of the germ, the broken fine germ particles are easily mixed into the corn bran (i.e., the endosperm product) and are difficult to remove. The fat content of the germ is relatively high, and the corn flour obtained by grinding corn bran mixed with a large amount of germ particles does not meet the quality requirements of low-fat corn flour.

[0003] Based on this, it is necessary to study a multi-stage corn germ extraction system and process. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a multi-stage corn germ extraction system and process, which can effectively solve the problems of low germination rate and low germ integrity of existing corn germ extraction processes, resulting in poor quality of germ products and corn bran products.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: A multi-stage corn germ extraction system, comprising a corn cleaning system, a preliminary corn breaking and germ extraction system and a fine corn breaking and germ extraction system; The preliminary crushing and germ extraction system comprises a preliminary crushing machine, a large particle size screening machine and a large particle size color sorting machine; The input end of the preliminary crushing machine is connected to the grain cleaning system, and the output end of the preliminary crushing machine is connected to the input end of the large particle size screening machine; The output end of the large particle size screening machine is connected to the input end of the large particle size color sorter and the preliminary crushing machine at the same time; The fine bran breaking and germ extraction system comprises a fine bran breaking machine, a small particle size screening machine, a small particle size color sorting machine and a specific gravity germ extraction machine; The input end of the fine crushing machine is connected to the output end of the large particle size color sorter, and the output end of the fine crushing machine is connected to the input end of the small particle size screening machine; The output end of the small particle size screening machine is connected to the input ends of the small particle size color sorter and the large particle size color sorter at the same time; The output end of the small particle size color sorter is connected to the input end of the specific gravity embryo extractor.

[0006] Furthermore, an extended bran-breaking and germ-extracting system is provided between the preliminary bran-breaking and germ-extracting system and the fine bran-breaking and germ-extracting system; The extended bran breaking and germ extraction system includes an extended bran breaker, a medium-size particle size screener and a medium-size particle size color sorter; The input end of the extended crusher is connected to the output end of the large particle size color sorter, and the output end of the extended crusher is connected to the input end of the medium particle size screening machine. The output end of the medium particle size screening machine is connected to the input ends of the medium particle size color sorter and the large particle size color sorter; The input end of the medium particle size color sorter is also connected to the output end of the small particle size screening machine; The output end of the medium particle size color sorter is connected to the input end of the fine crusher; The fine bran breaking machine is connected to the large particle size color sorting machine through an extended bran breaking and germ extraction system.

[0007] Furthermore, it also includes an air selection system, which includes a cyclone separator, an air flow screen and a fan; A cyclone separator is arranged between the preliminary crusher and the large particle size screening machine, between the fine crusher and the small particle size screening machine, and between the extended crusher and the medium particle size screening machine. The light material output port of the cyclone separator is connected to the air flow screen through an air duct and a fan.

[0008] Furthermore, the airflow screen includes a primary airflow screen and a secondary airflow screen, the input port of the primary airflow screen is connected to the cyclone separator, and the under-screen output port of the primary airflow screen is connected to the input port of the secondary airflow screen; the mesh size of the secondary airflow screen is larger than the mesh size of the primary airflow screen.

[0009] Furthermore, the output ports of the large-particle-size color sorter and the medium-particle-size color sorter are both connected to a gravity re-selection system; the gravity re-selection system includes a specific gravity sorter.

[0010] Furthermore, the clean grain processing system includes a weighing scale, a modulator and a magnetic separator connected in sequence.

[0011] A multi-stage corn germ extraction process, applicable to the above-mentioned multi-stage corn germ extraction system, comprises the following steps: S100: clean valley treatment; Weigh the material output from the clean barn, then input the cleaned material into the modulator and add water to modulate it to keep the material cortex moist; The conditioned material is subjected to magnetic separation and then output to the primary crusher after magnetic separation; S200: primary crushing and screening; The primary crusher is used to break the material into multiple large particles, so that the germ and endosperm are initially separated. Use wind selection system to separate the light materials produced by crushing; Use a large-size screening machine to screen the air-selected materials to obtain whole particles, large particles and debris; Return the whole grains to the primary crushing machine for primary crushing again; Output large particles to the large particle size color sorter; S300: Large particle size color sorter; Use a large particle size color sorter to color sort large particles and separate the large particle size germs from the large particles. The large particles after color sorting are conveyed to the fine crusher; S400: fine crushing and screening; Use fine crusher to finely crush the material, breaking large particles into multiple small particles, so that the germ and endosperm can be further separated; Use wind selection system to separate the light materials produced by crushing; Use a small particle size screening machine to screen the air-selected materials to obtain large particles, small particles and debris; The large particles are transported back to the fine crusher for further fine crushing; Output small particles to the small particle size color sorter; S500: fine color sorting; Use a small particle size color sorter to color sort small particles and separate the small particle size germs from the small particles; The small particles after color sorting are transported to the gravity germ extractor; S600: Gravity extraction; A specific gravity germ extractor is used to extract the germs of small particles by gravity to obtain small-sized germs and small-sized corn bran.

[0012] Furthermore, in step S300, the large particles after color sorting are transported to an extended crushing machine; The steps S300-S400 also include the following steps: S310: Extended crushing and screening; The material is expanded and crushed by an extended crusher to break large particles into multiple medium particles, so that the germ and endosperm are further separated; Use wind selection system to separate the light materials produced by crushing; Use a small particle size screening machine to screen the air-selected materials to obtain large particles, medium particles and debris; The large particles are transported back to the expansion crusher for further expansion crushing; Output the medium particles to the medium particle size color sorter; S320: Medium particle size color sorter; Use a medium-size color sorter to color sort the medium particles and separate the medium-size germs from the medium particles; The medium particles after color sorting are conveyed to the fine crusher.

[0013] Furthermore, in step S300, a reselector is used to reselect the separated large-size germs, thereby further obtaining large-size germs and large-size corn bran; In step S320, a reselector is used to reselect the separated medium-sized germs, so as to further obtain medium-sized germs and medium-sized corn bran.

[0014] Furthermore, in the step S300, the large-size germ and the large-size corn bran are transported to the large-size germ bin and the large-size corn bran bin respectively; In the step S320, the medium-sized germ and the medium-sized corn bran are transported to the medium-sized germ bin and the medium-sized corn bran bin respectively; In the step S600, the small-sized germ and the small-sized corn bran are transported to the small-sized germ bin and the small-sized corn bran bin respectively.

[0015] The beneficial effects of the above technical solution are: (1) The present invention adopts a combination of a preliminary crushing system and a fine crushing system. The preliminary crushing and germ extraction system includes a preliminary crushing machine, a large-size screener and a large-size color sorter, which are used to perform preliminary crushing of corn kernels and screen out large-size materials, so that the germ is initially separated, and the large-size germ is selected from the large kernels by color, and the remaining large-size materials are then output to the fine crushing system for secondary crushing. The fine crushing system includes a fine crushing machine, a small-size screener and a small-size color sorter, which are used to perform fine crushing of small kernels and screen out small-size materials, so that the germ is further separated, and the small-size germ is selected from the small kernels by color, and the remaining small-size materials are then output to the specific gravity germ extraction machine for secondary germ extraction; not only can large-size germs with high integrity be obtained, but also the germ extraction rate can be improved, so that the obtained corn kernel products and germ products have high purity.

[0016] (2) The large particle output end of the small particle size screening machine of the present invention is connected to the input end of the large particle size color sorter, so that the large particles are re-selected for large particle size color sorting, and after large particle size color sorting, they are returned to the fine crushing machine for further crushing, which can ensure that the large particles are fully crushed into small particles, and can timely select the large particle size germ in the large particles, thereby avoiding the large particle size germ in the large particles from being destroyed and affecting the integrity.

[0017] (3) The present invention sets a specific gravity germ extractor to perform secondary germ extraction on the small-particle material after color sorting, mainly considering that a small particle size will affect the accuracy of color sorting. In order to further improve the germ extraction rate, two different devices and processes are combined to extract the germ of the small-particle material, so as to improve the purity of the obtained small-particle germ and small-particle corn bran.

[0018] (4) The present invention provides an extended germ-breaking and germ-extracting system between the preliminary germ-breaking and germ-extracting system and the fine germ-breaking and germ-extracting system, thereby realizing a step-by-step germ-breaking process, separating the germs step by step, and improving the germination rate and the integrity of the germs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a system diagram of Example 1; Figure 2 It is a process diagram of Example 1; Figure 3 This is a system diagram of Example 2; Figure 4 This is a process diagram of Example 2.

[0020] Figure numerals: 1 is a clean grain processing system, 2 is a preliminary grain breaker, 3 is a large particle size screen, 4 is a large particle size color sorter, 5 is a fine grain breaker, 6 is a small particle size screen, 7 is a small particle size color sorter, 8 is a specific gravity germ extractor, 9 is an extended grain breaker, 10 is a medium particle size screen, 11 is a medium particle size color sorter, 12 is a cyclone separator, 13 is an air flow screen, 14 is a fan, 15 is a specific gravity sorter, 101 is a weighing scale, 102 is a modulator, 103 is a magnetic separator, 1301 is a primary air flow screen, 1302 is a secondary air flow screen, 16 is a clean grain bin, 17 is an elevator, and 18 is a feeder. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Example 1. This example aims to provide a multi-stage corn germ extraction system and process, which is mainly used for corn kernels to extract germs, and aims to solve the problems of low germination rate and low germ integrity in existing corn germ extraction processes, which result in poor quality of germ products and corn bran products.

[0022] A multi-stage corn germ extraction system, such as Figure 1 , including the grain cleaning system 1, the preliminary bran breaking and germ extraction system, and the fine bran breaking and germ extraction system.

[0023] The clean grain processing system 1 includes a metering scale 101, a modulator 102 and a magnetic separator 103 connected in sequence. The metering scale 101 is used to weigh and measure the clean grain output from the clean grain bin 16; the weighed material enters the modulator 102 for water conditioning, and a dynamic conditioning method is adopted to flexibly control the amount of water added according to the moisture content of the raw grain, and the amount of water added is 0.5%-1%. The role of conditioning is to keep the cortex of the corn kernels moist, increase the toughness of the cortex, greatly reduce the breakage rate of the germ in the subsequent breaking and processing process, and ensure the integrity and high yield of the germ. The modulated material is magnetically separated by a magnetic separator 103 to select the magnetic substances in the material, which not only ensures the purity of the mainstream product, but also protects the subsequent equipment.

[0024] The preliminary corn breaker and germ extraction system includes a preliminary corn breaker 2, a large-size screening machine 3 and a large-size color sorter 4. The input end of the preliminary corn breaker 2 is connected to the grain cleaning system 1. The preliminary corn breaker 2 is mainly used for preliminary corn breaker, which only slightly breaks the whole corn kernels, breaks the corn kernels into 3-4 petals, splits the corn kernels into large particles, avoids excessive fragmentation, and some corn kernels can release large-size germs with the highest integrity. The specific principle and structure of the preliminary corn breaker 2 adopt the existing technology and will not be repeated here.

[0025] The output end of the preliminary crusher 2 is connected to the input end of the large particle size screening machine 3. The large particle size screening machine 3 uses a vibrating screen with a three-stage screening function, which can separate the crushed materials into whole grains, large grains and debris. The whole grain output end of the large particle size screening machine 3 is connected to the input end of the preliminary crusher 2, and the whole corn kernels that have not been crushed are re-crushed to ensure that all materials are crushed by the preliminary crusher 2 and become large particles.

[0026] The large particle output end of the large particle size screening machine 3 is connected to the input end of the large particle size color sorter 4. The sieved debris is uniformly transported to the debris bin for collection and used to produce by-products such as feed.

[0027] The large particle size color sorter 4 is mainly used for color sorting large particles. It uses the color difference between endosperm and germ to select large particles of germ from large particles. Large particles enter the large particle size color sorter 4 from the collecting hopper at the top, and the large particles fall along the feeding distribution trough through the vibration of the feeding device (vibrator). The large particles pass through the vibrator at the upper end of the chute, and slide down the chute at an accelerated speed into the sorting box. After entering the sorting box, it passes between the image processing sensor CCD and the background device. Under the action of the light source, the CCD receives the synthetic light signal from the selected material, so that the system generates an output signal, and transmits it to the FPGA+ARM computing processing system after amplification and processing. Then the control system issues a command to drive the injection solenoid valve to blow the germ particles into the material cavity of the discharge hopper and flow away. The main stream of large particles continues to fall into the receiving hopper for output, thereby achieving the purpose of selecting large particles of germ from large particles.

[0028] The fine corn crushing and germ extraction system includes a fine corn crusher 5, a small particle size screening machine 6, a small particle size color sorter 7 and a specific gravity germ extraction machine 8. The fine corn crusher 5 is used to further crush the large corn kernels, and then crush them to 12 petals or more relative to the whole kernels, so that the large kernels are split into small kernels, so that the corn kernels further release the germs, obtain small-size germs, and improve the germination rate. The specific principle and structure of the fine corn crusher 5 adopt the existing technology and will not be repeated here.

[0029] The input end of the fine crusher 5 is connected to the large particle output end of the large particle size color sorter 4 for crushing the large particles. The output end of the fine crusher 5 is connected to the input end of the small particle size screening machine 6.

[0030] The large particle size screening machine 3 is a vibrating screen with a three-stage screening function, which can separate the crushed materials into large particles, small particles and debris. The large particle output end of the small particle size screening machine 6 is connected to the input end of the large particle size color sorter 4, so that the large particles are re-selected for large particle size color sorting, and after large particle size color sorting, they are returned to the fine crushing machine 5 for crushing again, which can ensure that the large particles are fully crushed into small particles, and the large particle size germ in the large particles can be timely selected by color sorting to avoid the large particle size germ being broken.

[0031] The small particle output end of the small particle size screening machine 6 is connected to the input end of the small particle size color sorter 7. The working principle of the small particle size color sorter 7 is the same as that of the large particle size color sorter 4, but it is more focused on the color sorting of small particles. The small particle size color sorter 7 selects part of the small particle size germs from the mainstream of the small particle material, and then outputs the mainstream of the small particle material to the specific gravity germ extractor 8 for gravity germ extraction, and transports the small particle size germs to the small particle size germ bin for collection and storage.

[0032] The input end of the gravity germ extractor 8 is connected to the output end of the small particle size color sorter 7 through the feeder 18. The gravity germ extractor 8 utilizes the different specific gravity and suspension speed of the germ and corn grits. The material is graded by the airflow passing through the gap between the germs. Under the action of the sieve plate that is directional and tilted to reciprocate, the material moves toward the discharging end. The corn grits floating on the upper layer flow toward the discharge port under the action of its own weight, thereby separating the corn grits from the germ. The specific structure and working principle of the gravity germ extractor 8 are all based on the existing technology, which will not be repeated here. However, it should be noted that the gravity germ extractor 8 is set to perform secondary germ extraction on the small particle material after color sorting, mainly considering that the small particle size will affect the accuracy of color sorting. In order to further improve the germ extraction rate, two different equipment and processes are combined to extract the germ of the small particle material to improve the purity of the obtained small particle size germ and small particle size corn grits. The small-size germs and small-size corn bran obtained by the gravity germ extractor 8 are respectively transported to a small-size germ bin and a small-size corn bran bin for collection and storage.

[0033] Further, such as Figure 1, and also includes an air selection system, which includes a cyclone separator 12, an air flow screen 13 and a fan 14. A cyclone separator 12 is provided between the preliminary crusher 2 and the large particle size screening machine 3, and between the fine crusher 5 and the small particle size screening machine 6. The cyclone separator 12 includes a feed port, a light material output port and a heavy material output port. The output ports of the preliminary crusher 2 and the fine crusher 5 are connected to the input ports of the corresponding cyclone separators 12, and the input ports of the large particle size screening machine 3 and the small particle size screening machine 6 are connected to the heavy material output ports of the corresponding cyclone separators 12. The light material output ports of each cyclone separator 12 are connected to a unified air duct, and a fan 14 is provided on the air duct, and finally the light materials are uniformly transported to the air flow screen 13. The cyclone separator 12 is mainly used to separate light materials such as fine powder, corn husks, and small corn crumbs produced after crushing. The specific structure and working principle of the cyclone separator 12 are based on existing technologies and will not be described in detail here.

[0034] The airflow screen 13 includes a primary airflow screen 1301 and a secondary airflow screen 1302. Both the primary airflow screen 1301 and the secondary airflow screen 1302 include a box and a screen. The wind force carries the light objects through the screen from bottom to top, thereby separating the light objects. The screen mesh of the secondary airflow screen 1302 is larger than the screen mesh of the primary airflow screen 1301. The primary airflow screen 1301 is used to screen out fine powder from the light objects, and the secondary airflow screen 1302 is used to screen the remaining light objects for a second time. The input port of the primary airflow screen 1301 is connected to each cyclone separator 12 to separate the fine powder from other components in the light objects. The under-screen output port of the primary airflow screen 1301 is connected to the input port of the secondary airflow screen 1302, that is, the other light objects except the fine powder will be screened again through the secondary airflow screen 1302, and the small corn crumbs and corn husks therein will be sorted, thereby obtaining different light object byproducts.

[0035] Furthermore, the large-size germ output port of the large-size color sorter 4 is connected to a gravity re-selection system, which includes a specific gravity germ extractor 15. The specific gravity germ extractor 15 has the same principle as the specific gravity germ extractor 8, but is used to re-select the large-size germ of the large-size color sorter 4, and then extract large-size corn bran from the large-size germ, so as to obtain large-size corn bran products and improve the purity of large-size germ.

[0036] A multi-stage corn germ extraction process, such as Figure 2 , applicable to the above-mentioned multi-stage corn germ extraction system, comprising the following steps: S100: clean valley treatment; The material output from the clean barn 16 is weighed, and then the cleaned material is input into the modulator 102 for water modulation, with the water addition amount of 0.5%-1% to keep the cortex of the material moist; The conditioned material is subjected to magnetic separation and then output to the primary crusher after magnetic separation.

[0037] S200: primary crushing and screening; The primary crusher is used to break the material into 3-6 large particles, so that the germ and endosperm are initially separated. A winnowing system is used to separate the light materials produced by corn crushing, wherein the light materials include at least fine powder, corn husks and small corn crumbs; The large-size screening machine 3 is used to screen the air-selected material to obtain whole particles, large particles and debris; Return the whole grains to the primary crushing machine for primary crushing again; Output the large particles to the large particle size color sorter 4; The debris is output to the debris bin for collection and storage.

[0038] S300: Large particle size color sorter; The large particle size color sorter 4 is used to color sort the large particles to separate the large particle size germs in the large particles; the large particles after color sorting are transported to the fine crusher 5.

[0039] S400: fine crushing and screening; The fine crusher 5 is used to finely crush the material, breaking large particles into multiple small particles, so that the germ and endosperm are further separated; The light materials produced by crushing are separated by an air selection system; the materials after air selection are screened by a small particle size screening machine 6 to obtain large particles, small particles and debris; The large particles are transported back to the fine crusher 5 for further fine crushing; the small particles are output to the small particle size color sorter 7, and the debris is output to the debris bin for collection and storage.

[0040] S500: fine color sorting; The small particles are color sorted by a small particle size color sorter 7 to separate the small particle size germs from the small particles; The small particles after color sorting are transported to the gravity germ extractor.

[0041] S600: Gravity extraction; The small particles are subjected to gravity germ extraction by a specific gravity germ extractor 8 to obtain small-size germs and small-size corn bran.

[0042] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that an extended crushing system is additionally provided between the primary crushing system and the fine crushing system. This embodiment further illustrates the structure.

[0043] In this embodiment, Figure 3An extended crumb breaking and germ extracting system is arranged between the preliminary crumb breaking and germ extracting system and the fine crumb breaking and germ extracting system; the extended crumb breaking and germ extracting system comprises an extended crumb breaking machine 9, a medium particle size screening machine 10 and a medium particle size color sorting machine 11.

[0044] The extended corn breaker 9 is used to further break the large corn kernels, and then break them into 6-8 petals relative to the whole kernels, so that the large particles are split into medium particles, and the corn kernels further release the germ, obtain medium-sized germ, and improve the germination rate. The subsequent fine corn breaker 5 processes the medium particles, thereby realizing a step-by-step breaking process, separating the germ step by step, and improving the germination rate and the integrity of the germ. The specific principle and structure of the extended corn breaker 9 are all based on the existing technology, which will not be repeated here. The input end of the extended corn breaker 9 is connected to the output end of the large-size color sorter 4, and the output end of the extended corn breaker 9 is connected to the input end of the medium-size screening machine 10.

[0045] The medium particle size screening machine 10 is a vibrating screen with a three-stage screening function, which can separate the crushed materials into large particles, medium particles and debris. The large particle output end of the medium particle size screening machine 10 is connected to the input end of the large particle size color sorter 4, so that the large particles are re-selected for large particle size color sorting, and after the large particle size color sorting, they are returned to the extended crusher 9 for crushing again.

[0046] The medium particle output end of the medium particle size screening machine 10 is connected to the input end of the medium particle size color sorter 11. The working principle of the medium particle size color sorter 11 is the same as that of the large particle size color sorter 4, but it is more focused on the color sorting of medium particles. The medium particle size color sorter 11 selects part of the medium particle size germs from the mainstream of the medium particle material, and then outputs the mainstream of the medium particle material to the fine crusher 5.

[0047] Correspondingly, the fine crusher 5 is connected to the large particle size color sorter 4 via the extended crushing and germ extraction system, and is no longer directly connected to the large particle size color sorter 4. In this embodiment, the small particle size screener 6 separates the material into medium particles, small particles and debris. The medium particle output end of the small particle size screener 6 is connected to the input end of the medium particle size color sorter 11, so that the medium particles are re-selected for medium particle size color sorting, and after the medium particle size color sorting, they are returned to the fine crusher 5 for crushing again.

[0048] Furthermore, the medium-size germ output port of the medium-size color sorter 11 is also connected to a separate gravity re-selection system, which is used to re-select the medium-size germ of the medium-size color sorter 11, and then extract medium-size corn bran from the medium-size germ, so as to obtain medium-size corn bran products and improve the purity of the medium-size germ.

[0049] like Figure 4 In this example, in process step S300, the large particles after color sorting are transported to the extended crusher 9 instead of the fine crusher 5.

[0050] The steps S300-S400 also include the following steps: S310: Extended crushing and screening; The material is extended and crushed by an extended crusher 9 to break large particles into multiple medium particles, so that the germ and endosperm are further separated; The light materials produced by crushing are separated by an air selection system; the materials after air selection are screened by a small particle size screening machine 6 to obtain large particles, medium particles and debris; The large particles are transported back to the expansion crusher 9 for further expansion crushing; the medium particles are output to the medium particle size color sorter 11; and the debris is output to the debris bin for collection and storage.

[0051] S320: Medium particle size color sorter; The medium-size color sorter 11 is used to color sort the medium-size particles to separate the medium-size germs in the medium-size particles; and the color-sorted medium-size particles are transported to the fine crusher 5.

[0052] In step S400, the medium particles are transported back to the expansion crusher 9 for expansion crushing again.

[0053] In step S300, the separated large-size germs are reselected by a reselector 15, so as to further obtain large-size germs and large-size corn bran.

[0054] In step S320, another reselector 15 is used to reselect the separated medium-sized germs, so as to further obtain medium-sized germs and medium-sized corn bran.

[0055] In step S300, the large-size germ and the large-size corn bran are transported to the large-size germ bin and the large-size corn bran bin respectively.

[0056] In step S320, the medium-sized germ and the medium-sized corn bran are transported to the medium-sized germ bin and the medium-sized corn bran bin respectively.

[0057] In step S600, the small-size germ and the small-size corn crumbs are transported to the small-size germ bin and the small-size corn crumb bin, respectively. That is, in this embodiment, six products, namely, large-size germ, large-size corn crumbs, medium-size germ, medium-size corn crumbs, small-size germ and small-size corn crumbs, and four by-products, namely, crumbs, fine powder, corn husks and small corn crumbs, can be obtained.

Claims

1. A multi-stage corn germ extraction system, characterized in that: Including the grain cleaning system, the preliminary grain breaking and germ extraction system and the fine grain breaking and germ extraction system; The preliminary crushing and germ extraction system comprises a preliminary crushing machine, a large particle size screening machine and a large particle size color sorting machine; The input end of the preliminary crushing machine is connected to the grain cleaning system, and the output end of the preliminary crushing machine is connected to the input end of the large particle size screening machine; The output end of the large particle size screening machine is connected to the input end of the large particle size color sorter and the preliminary crushing machine at the same time; The fine bran breaking and germ extraction system comprises a fine bran breaking machine, a small particle size screening machine, a small particle size color sorting machine and a specific gravity germ extraction machine; The input end of the fine crushing machine is connected to the output end of the large particle size color sorter, and the output end of the fine crushing machine is connected to the input end of the small particle size screening machine; The output end of the small particle size screening machine is connected to the input ends of the small particle size color sorter and the large particle size color sorter at the same time; The output end of the small particle size color sorter is connected to the input end of the specific gravity embryo extractor.

2. A multi-stage corn germ extraction system according to claim 1, characterized in that: An extended bran-breaking and germ-extracting system is provided between the preliminary bran-breaking and germ-extracting system and the fine bran-breaking and germ-extracting system; The extended bran breaking and germ extraction system includes an extended bran breaker, a medium-size particle size screener and a medium-size particle size color sorter; The input end of the extended crusher is connected to the output end of the large particle size color sorter, and the output end of the extended crusher is connected to the input end of the medium particle size screening machine. The output end of the medium particle size screening machine is connected to the input ends of the medium particle size color sorter and the large particle size color sorter; The input end of the medium particle size color sorter is also connected to the output end of the small particle size screening machine; The output end of the medium particle size color sorter is connected to the input end of the fine crusher; The fine bran breaking machine is connected to the large particle size color sorting machine through an extended bran breaking and germ extraction system.

3. A multi-stage corn germ extraction system according to claim 2, characterized in that: Also included is an air selection system, which includes a cyclone separator, an air flow screen and a fan; A cyclone separator is arranged between the preliminary crusher and the large particle size screening machine, between the fine crusher and the small particle size screening machine, and between the extended crusher and the medium particle size screening machine. The light material output port of the cyclone separator is connected to the air flow screen through an air duct and a fan.

4. A multi-stage corn germ extraction system according to claim 3, characterized in that: The airflow screen comprises a primary airflow screen and a secondary airflow screen, the input port of the primary airflow screen is connected to the cyclone separator, the under-screen output port of the primary airflow screen is connected to the input port of the secondary airflow screen; the mesh size of the secondary airflow screen is larger than the mesh size of the primary airflow screen.

5. The multi-stage corn germ extraction system according to claim 2, characterized in that: The output ports of the large-particle-size color sorter and the medium-particle-size color sorter are both connected to a gravity reselection system; the gravity reselection system includes a relative weight sorter.

6. A multi-stage corn germ extraction system according to any one of claims 1-5, characterized in that: The clean grain processing system comprises a weighing scale, a modulator and a magnetic separator which are connected in sequence.

7. A multi-stage corn germ extraction process, applicable to the multi-stage corn germ extraction system according to claim 1, comprising the following steps: S100: clean valley treatment; Weigh the material output from the clean barn, then input the cleaned material into the modulator and add water to modulate it to keep the material cortex moist; The conditioned material is subjected to magnetic separation and then output to the primary crusher after magnetic separation; S200: primary crushing and screening; The primary crusher is used to break the material into multiple large particles, so that the germ and endosperm are initially separated. Use wind selection system to separate the light materials produced by crushing; Use a large-size screening machine to screen the air-selected materials to obtain whole particles, large particles and debris; Return the whole grains to the primary crushing machine for primary crushing again; Output large particles to the large particle size color sorter; S300: Large particle size color sorter; Use a large particle size color sorter to color sort large particles and separate the large particle size germs from the large particles. The large particles after color sorting are conveyed to the fine crusher; S400: fine crushing and screening; Use fine crusher to finely crush the material, breaking large particles into multiple small particles, so that the germ and endosperm can be further separated; Use wind selection system to separate the light materials produced by crushing; Use a small particle size screening machine to screen the air-selected materials to obtain large particles, small particles and debris; The large particles are transported back to the fine crusher for further fine crushing; Output small particles to the small particle size color sorter; S5 00: fine color sorting; Use a small particle size color sorter to color sort small particles and separate the small particle size germs from the small particles; The small particles after color sorting are transported to the gravity germ extractor; S600: Gravity extraction; A specific gravity germ extractor is used to extract the germs of small particles by gravity to obtain small-sized germs and small-sized corn bran.

8. A multi-stage corn germ extraction process according to claim 7, characterized in that: In step S300, the large particles after color sorting are transported to the extended crusher; The steps S300-S400 also include the following steps: S310: Extended crushing and screening; The material is expanded and crushed by an extended crusher to break large particles into multiple medium particles, so that the germ and endosperm are further separated; Use wind selection system to separate the light materials produced by crushing; Use a small particle size screening machine to screen the air-selected materials to obtain large particles, medium particles and debris; The large particles are transported back to the expansion crusher for further expansion crushing; Output the medium particles to the medium particle size color sorter; S320: Medium particle size color sorter; Use a medium-size color sorter to color sort the medium particles and separate the medium-size germs from the medium particles; The medium particles after color sorting are conveyed to the fine crusher.

9. A multi-stage corn germ extraction process according to claim 8, characterized in that: In step S300, a reselector is used to reselect the separated large-size germs, thereby further obtaining large-size germs and large-size corn bran; In step S320, a reselector is used to reselect the separated medium-sized germs, so as to further obtain medium-sized germs and medium-sized corn bran.

10. The multi-stage corn germ extraction process according to claim 9, characterized in that: In the step S300, the large-size germ and the large-size corn bran are transported to the large-size germ bin and the large-size corn bran bin respectively; In the step S320, the medium-sized germ and the medium-sized corn bran are transported to the medium-sized germ bin and the medium-sized corn bran bin respectively; In the step S600, the small-sized germ and the small-sized corn bran are transported to the small-sized germ bin and the small-sized corn bran bin respectively.

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