Combined treatment method for out-of-grain brown rice and husked rice

Abstract

The invention discloses a combined treatment method for unhusked rice and husked rice after husking, and relates to the technical field of rice processing, and the combined treatment method comprises the following steps: carrying out specific gravity grading treatment on unhusked rice containing unhusked rice and side-by-side stones to remove the side-by-side stones to obtain a first rice and husked rice mixture; the first husked rice mixture is subjected to first gravity separation treatment, and a second husked rice mixture and first clean rice are obtained; performing first hulling treatment on the first clean rice to obtain a third husked rice mixture; the second husked rice mixture and the third husked rice mixture are mixed and then subjected to at least one time of gravity grading treatment, brown rice and second clean rice are obtained, and the second clean rice is used for second husking treatment. According to the processing method, the loss of the unprocessed grains can be reduced, meanwhile, the content of unprocessed grains entering the hulling processing procedure and the content of brown rice in the unprocessed grains entering the hulling processing procedure are reduced, the phenomena of cracking and coarse breaking are reduced, and the rice yield and the head rice yield are increased.

Description

Technical Field

[0001] The present invention relates to the technical field of paddy processing, and particularly relates to a combined treatment method for brown rice outside the paddy and paddy containing brown rice in the return husk Background Art

[0002] In recent years, with the improvement of the mechanization degree of paddy harvesting and transportation and the popularization of paddy drying technology, some paddy with a relatively high maturity has completed the dehulling process during non-dehulling processes such as harvesting, transportation or drying and becomes brown rice. This kind of brown rice is called brown rice outside the paddy. In "GB1350-2009 Paddy", it is stipulated that the content of brown rice outside the paddy in paddy ≤ 2%.

[0003] However, the actual content of brown rice outside the paddy is continuously rising and shows an increasing trend year by year. On average, it is between 3.0% and 5.0%, and the highest reaches 10.0%. The treatment of brown rice outside the paddy has become a difficult point in the paddy processing process. The main reasons are as follows: (1) Before paddy dehulling, it is necessary to remove "parallel stones" through a specific gravity stoner. However, the brown rice grains are relatively close to the "parallel stones" in terms of specific gravity and surface friction coefficient, etc., and are easily mixed into the stone outlet and discharged, becoming the by-products of the stoner and being difficult to recycle, resulting in waste of grain; (2) Some brown rice outside the paddy and paddy enter the huller together for dehulling. During the hulling process, due to the lack of protection of the rice husk, the brown rice outside the paddy is prone to produce cracked kernels or surface scratching. The cracked kernels of brown rice result in a relatively high broken rice rate and a reduced rice yield; the surface scratching of brown rice will affect the separation effect of the gravity separator for paddy and brown rice, causing a vicious cycle in the hulling section and ultimately affecting the yield and rice yield. Summary of the Invention

[0004] The main purpose of the present invention is to propose a combined treatment method for brown rice outside the paddy and paddy containing brown rice in the return husk, aiming to solve the problem of high content of brown rice outside the paddy in the prior art.

[0005] To achieve the above object, the present invention proposes a combined treatment method for brown rice outside the paddy and paddy containing brown rice in the return husk, including the following steps:

[0006] S10. Perform specific gravity classification on the paddy containing brown rice outside the paddy and parallel stones to remove the parallel stones, and obtain a first paddy-brown rice mixture;

[0007] S20. Perform first gravity separation on the first paddy-brown rice mixture to obtain a second paddy-brown rice mixture and a first clean paddy;

[0008] S30. Perform first dehulling on the first clean paddy to obtain a third paddy-brown rice mixture;

[0009] S40. Mix the second paddy-brown rice mixture and the third paddy-brown rice mixture and perform at least one gravity classification to obtain brown rice and a second clean paddy, and the second clean paddy is used for second dehulling.

[0010] In one embodiment, step S40 includes:

[0011] S401a. Mix the second paddy and brown rice mixture and the third paddy and brown rice mixture, and then perform a second gravity separation process to obtain a fourth paddy and brown rice mixture, brown rice, and a third clean paddy;

[0012] S402a. Perform a third gravity separation process on the third clean paddy to obtain a fourth clean paddy and a fifth paddy and brown rice mixture, and the fourth clean paddy is used for a second hulling process.

[0013] In one embodiment, step S40 includes:

[0014] S401b. Mix the second paddy and brown rice mixture and the third paddy and brown rice mixture, and then perform a second gravity separation process to obtain a fourth paddy and brown rice mixture, brown rice, and a third clean paddy;

[0015] S402b. Perform a color sorting process on the third clean paddy to obtain a sixth paddy and brown rice mixture and a fifth clean paddy, and the fifth clean paddy is used for a second hulling process.

[0016] In one embodiment, in step S10, the equipment for the specific gravity classification process includes a specific gravity classification and stone removing machine:

[0017] The air flow velocity of the specific gravity classification and stone removing machine is 1.2 - 1.3 m / s; the screen inclination angle of the specific gravity stone removing machine is 5 - 9°; the unit flow rate of the specific gravity stone removing machine is 60 - 100 kg / (cm·h); the vibration frequency of the specific gravity stone removing machine is 16.7 Hz; the vibration amplitude of the specific gravity stone removing machine is 4.0 - 5.5 mm; the negative pressure of the specific gravity stone removing machine is 50 - 90 mmH2O.

[0018] In one embodiment, the equipment for the first gravity separation process includes a first gravity paddy and brown rice separator, and the transverse inclination angle of the screen of the first gravity paddy and brown rice separator is 6 - 10°; the longitudinal inclination angle of the screen of the first gravity paddy and brown rice separator is 6.5 - 8°; the screen vibration frequency of the first gravity paddy and brown rice separator is 5.4 - 6.0 Hz; the screen amplitude of the first gravity paddy and brown rice separator is 16 - 19 mm; the discharge port of the first gravity paddy and brown rice separator includes a second paddy and brown rice mixture discharge port and a first clean paddy discharge port; and / or,

[0019] The equipment for the second gravity separation treatment includes a second gravity rice-rough separator, the lateral inclination angle of the screen surface of the second gravity rice-rough separator is 12-18°; the longitudinal inclination angle of the screen surface of the second gravity rice-rough separator is 7-10°; the vibration frequency of the screen surface of the second gravity rice-rough separator is 5.4-6.0 Hz; the amplitude of the screen surface of the second gravity rice-rough separator is 16-19 mm; the discharge ports of the second gravity rice-rough separator include a fourth rice-rough mixture discharge port, a third clean rice discharge port and a brown rice discharge port; and / or,

[0020] The equipment for the third gravity separation treatment includes a third gravity rice-rough separator, the lateral inclination angle of the screen surface of the third gravity rice-rough separator is 8 to 12°; the longitudinal inclination angle of the screen surface of the third gravity rice-rough separator is 6.5 to 8°; the vibration frequency of the screen surface of the third gravity rice-rough separator is 5.4 to 6.0 Hz; the screen surface amplitude of the third gravity rice-rough separator is 16 to 19 mm; the discharge ports of the third gravity rice-rough separator include a sixth rice-rough mixture discharge port and a fifth clean rice discharge port.

[0021] In one embodiment, the equipment for the first shelling process and / or the second shelling process comprises a rice husker, and the rice husker comprises a first rubber roller and a second rubber roller, and the rotation speed of the first rubber roller is greater than the rotation speed of the second rubber roller:

[0022] The rotation speed of the first rubber roller is 14.5-17.0 m / s; the rotation speed of the second rubber roller is 12.5-14.0 m / s; the linear speed difference between the first rubber roller and the second rubber roller is 2.6-3.6 m / s; the distance between the first rubber roller and the second rubber roller is 1.0-2.5 mm.

[0023] In one embodiment, the color sorting equipment includes a color sorter:

[0024] The accuracy of the color sorter is 85% to 95%, and the sensitivity of the color sorter is 100 to 150.

[0025] In one embodiment, in step S10, the mass percentage of brown rice in the removed husks is ≤2%, and the content of husks in the first grain-brown mixture is ≤1 grain / kg.

[0026] In one embodiment, in step S30, the mass percentage of brown rice in the first clean rice grains is ≤2%.

[0027] In one embodiment, in step S401b, the mass percentage of brown rice in the third clean rice is ≤2%, and the content of rice in the brown rice is ≤10 grains / kg.

[0028] In the technical solution of the present invention, first, the paddy containing brown rice outside the paddy and cobblestones is sequentially subjected to specific gravity classification treatment and first gravity separation treatment. While removing cobblestones and reducing the residue of the original grain in the cobblestones, the content of brown rice outside the paddy in the paddy entering the hulling treatment process is reduced, reducing the phenomenon of brown rice being cracked or crushed during hulling treatment, and improving the rice yield and head rice yield of the final brown rice product. Secondly, the hulling rate of the hulling treatment is limited. Performing at least one gravity separation treatment on the product after hulling treatment can separate the unhulled paddy from the brown rice, reduce the content of unhulled paddy in the brown rice, and obtain a brown rice product with less impurities. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 It is the combined treatment process of brown rice outside the paddy and return rice containing brown rice provided in Embodiment 2 of the present invention.

[0031] The realization of the object of the present invention, functional features and advantages will be further described in conjunction with the embodiments and with reference to the drawings. Detailed Embodiments

[0032] In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Those not specified in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments not indicated by the manufacturer are all conventional products that can be obtained through commercial purchase. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] In recent years, with the improvement of the mechanization level of rice harvesting and transportation and the popularization of rice drying technology, during the non-hulling processes such as harvesting, transportation or drying, some rice with a relatively high maturity has completed the hulling process and become brown rice. This type of brown rice is called off-hull brown rice. In "GB1350-2009 Rice", it is stipulated that the content of off-hull brown rice in rice should be ≤2%.

[0034] However, the actual content of off-hull brown rice has been continuously rising and shows an increasing trend year by year. On average, it is between 3.0% and 5.0%, and the highest reaches 10.0%. The treatment of off-hull brown rice has become a difficult point in the rice processing process. The main reasons are as follows: (1) Before the rice is hulled, it is necessary to remove "associated stones" through a specific gravity stone separator. However, the brown rice grains are relatively close to the "associated stones" in terms of characteristics such as specific gravity and surface friction coefficient, and are easily mixed into the stone outlet and discharged, becoming the by-products of the stone separator and being difficult to recycle, resulting in waste of grain; (2) Some off-hull brown rice enters the rice huller together with the rice for hulling. During the hulling process, due to the lack of protection of the rice husk, the off-hull brown rice is prone to develop internal cracks or surface scratches. The internal cracks of the brown rice lead to a relatively high broken rice rate and a decrease in the rice yield rate; the surface scratches of the brown rice will affect the separation effect of the gravity rice-brown rice separator, causing a vicious cycle in the hulling section and ultimately affecting the output and the rice yield rate.

[0035] In view of this, the present invention provides a combined treatment method for off-hull brown rice and return rice hulls containing brown rice, including the following steps:

[0036] S10. Perform specific gravity classification on the rice containing off-hull brown rice and associated stones to remove the associated stones, and obtain a first rice-brown rice mixture;

[0037] S20. Perform a first gravity separation treatment on the first rice-brown rice mixture to obtain a second rice-brown rice mixture and a first clean rice;

[0038] S30. Perform a first hulling treatment on the first clean rice to obtain a third rice-brown rice mixture;

[0039] S40. Mix the second rice-brown rice mixture and the third rice-brown rice mixture and perform at least one gravity classification treatment to obtain brown rice and a second clean rice, and the second clean rice is used for a second hulling treatment.

[0040] In the technical solution of the present invention, first, the paddy containing brown rice outside the paddy and cobblestones is subjected to specific gravity classification treatment and first gravity separation treatment in sequence. While removing the cobblestones and reducing the residue of the original grain in the cobblestones, the content of brown rice outside the paddy in the paddy entering the hulling treatment process is reduced, the phenomenon of brown rice being cracked or broken during the hulling treatment is reduced, and the rice yield and head rice yield of the final brown rice product are improved; secondly, the hulling rate of the hulling treatment is limited. Performing at least one gravity separation treatment on the product after the hulling treatment can separate the unhulled paddy from the brown rice, reduce the content of unhulled paddy in the brown rice, and obtain a brown rice product with less impurities. Among them, the second clean paddy is the return paddy, that is, the paddy that has not been hulled in the first hulling treatment and needs to be hulled again.

[0041] It can be understood that in production, the paddy that has been hulled twice or more is called the return paddy, and the brown rice in it is called the brown rice content in the return paddy. The brown rice will also have the phenomenon of cracking or surface scratching. Through the combined treatment method of the present invention, not only can the content of brown rice outside the paddy be reduced, preventing the negative impact of brown rice in the first hulling treatment, but also the content of brown rice in the return paddy can be reduced, preventing the negative impact of brown rice during multiple hulling processes.

[0042] In addition, in view of the working principle of the equipment in the existing hulling treatment process and the method characteristics of paddy, the primary hulling rate of paddy is about 85% - 95%. Therefore, some paddy needs to return to the hulling treatment equipment for re-hulling. In the current paddy processing method, the return paddy generally also contains about 10% of brown rice, and this part of the brown rice is also prone to cracking or surface scratching, which has an adverse impact on the subsequent process. In some embodiments of the present invention, step S40 includes: S401a, mixing the second paddy-brown rice mixture and the third paddy-brown rice mixture and then performing a second gravity separation treatment to obtain a fourth paddy-brown rice mixture, brown rice, and third clean paddy; S402a, performing a third gravity separation treatment on the third clean paddy to obtain a fourth clean paddy and a fifth paddy-brown rice mixture, and the fourth clean paddy is used for the second hulling treatment.

[0043] In the technical solution of the present invention, the ratio of paddy to brown rice in the second paddy-brown rice mixture is similar to the ratio of paddy to brown rice in the third paddy-brown rice mixture. Therefore, mixing the second paddy-brown rice mixture and the third paddy-brown rice mixture for two gravity separation treatments, the content of brown rice in the third clean paddy obtained by the second gravity separation treatment is relatively high. Therefore, it is necessary to perform a third gravity separation treatment on the third clean paddy to further reduce the content of brown rice in the third clean paddy and obtain a clean paddy with a lower brown rice content as the return paddy. The fourth paddy-brown rice mixture and the fifth paddy-brown rice mixture are used for the second gravity separation treatment in the second round of paddy processing technology.

[0044] In some embodiments of the present invention, step S40 includes: S401b, mixing the second grain-rough mixture and the third grain-rough mixture and performing a second gravity separation process to obtain a fourth grain-rough mixture, brown rice and third clean rice; S402b, color sorting the third clean rice to obtain a sixth grain-rough mixture and fifth clean rice, and the fifth clean rice is used for a second husking process.

[0045] In the technical solution of the present invention, since the content of brown rice in the third clean rice obtained by the second gravity separation treatment is relatively high, it is easy to produce cracking or surface roughness when the third clean rice is directly used as the rice for husking, thereby reducing the product quality. Therefore, the third clean rice can be further subjected to color sorting treatment, and the optical properties of the brown rice and the rice such as color and glossiness can be used to identify and separate the brown rice particles of different colors. Each grain of brown rice in the third clean rice can be color sorted and identified by color sorting, thereby improving the identification precision and accuracy, and ensuring that the content of brown rice in the fifth clean rice is extremely low, thereby reducing the occurrence of cracking or surface roughness when the fifth clean rice is used as the rice for husking. The fourth rice-brown mixture and the sixth rice-brown mixture are used for the second gravity separation treatment in the second round of rice processing technology.

[0046] In some embodiments of the present invention, in step S10, the equipment for specific gravity grading treatment includes a specific gravity grading stone remover: the air flow velocity of the specific gravity grading stone remover is 1.2-1.3 m / s; the screen surface inclination angle of the specific gravity stone remover is 5-9°; the unit flow rate of the specific gravity stone remover is 60-100 kg / (cm·h); the vibration frequency of the specific gravity stone remover is 16.7 Hz; the vibration amplitude of the specific gravity stone remover is 4.0-5.5 mm; the negative pressure of the specific gravity stone remover is 50-90 mmH2O.

[0047] In the technical solution of the present invention, when the equipment for gravity grading treatment is a gravity grading stone removing machine, the materials are first diverted according to the difference in specific gravity: rice with the highest content and the smallest specific gravity is placed on the upper working surface as much as possible to reduce the working pressure of the lower stone removing working surface; shoulder stones (i.e. gravel), brown rice and some rice with a larger specific gravity are concentrated on the lower working surface for sorting. The flow rate of this part of the material is relatively low, and the roughness content of the shoulder stones can be ensured to meet the standards by simultaneously controlling the air flow velocity, screen surface inclination, screen surface area and vibration frequency of the gravity grading stone removing machine within the above-mentioned range. The brown rice outside the rice is discharged from the material outlet together with the rice as much as possible and enters the first gravity separation treatment process, thereby reducing the residual amount of brown rice in the shoulder stones and improving the utilization rate of the raw grains.

[0048] In some embodiments of the present invention, the equipment for the first gravity separation treatment includes a first gravity paddy and brown rice separator. The transverse inclination angle of the sieve surface of the first gravity paddy and brown rice separator is 6-10°; the longitudinal inclination angle of the sieve surface of the first gravity paddy and brown rice separator is 6.5-8°; the vibration frequency of the sieve surface of the first gravity paddy and brown rice separator is 5.4-6.0 Hz; the amplitude of the sieve surface of the first gravity paddy and brown rice separator is 16-19 mm; the discharge port of the first gravity paddy and brown rice separator includes a second paddy and brown rice mixture discharge port and a first clean paddy discharge port. In the technical solution of the present invention, the main purpose of the first gravity paddy and brown rice separator is to reduce the brown rice content in the first paddy and brown rice mixture. Therefore, it is necessary to transform the ordinary gravity paddy and brown rice separator equipment, change the three material discharge ports of the original equipment into two. One discharge port material is the first clean paddy, which is sent to the hulling treatment equipment; the other discharge port material is the second paddy and brown rice mixture enriched with brown rice outside the paddy, which is sent to the second gravity paddy and brown rice separator after the hulling treatment equipment. That is, the first gravity paddy and brown rice separator only needs to ensure that the brown rice content in the first clean paddy is relatively low, and it does not need to subdivide the first paddy and brown rice mixture into brown rice, clean paddy, and paddy and brown rice mixture.

[0049] In some embodiments of the present invention, the equipment for the second gravity separation treatment includes a second gravity paddy and brown rice separator. The transverse inclination angle of the sieve surface of the second gravity paddy and brown rice separator is 12-18°; the longitudinal inclination angle of the sieve surface of the second gravity paddy and brown rice separator is 7-10°; the vibration frequency of the sieve surface of the second gravity paddy and brown rice separator is 5.4-6.0 Hz; the amplitude of the sieve surface of the second gravity paddy and brown rice separator is 16-19 mm; the discharge port of the second gravity paddy and brown rice separator includes a fourth paddy and brown rice mixture discharge port, a third clean paddy discharge port, and a brown rice discharge port. In the technical solution of the present invention, the second gravity paddy and brown rice separator is normally configured with three discharge ports. The first treatment material is a mixture of the first paddy and brown rice mixture and the second paddy and brown rice mixture. After all the processes are carried out once, the fourth paddy and brown rice mixture and the fifth paddy and brown rice mixture / sixth paddy and brown rice mixture can be mixed with the second paddy and brown rice mixture and the third paddy and brown rice mixture in the next round of processes and then enter the second gravity paddy and brown rice separator for treatment. The principle is to divide the paddy and brown rice mixture into a fourth paddy and brown rice mixture, brown rice, and a third clean paddy through a multi-layer working sieve with a boss, and the brown rice will enter the subsequent rice milling process to be made into products. It should be noted that the second gravity paddy and brown rice separator does not need to consider the purity of the returned paddy, mainly to ensure the purity of the brown rice. Preferably, it can effectively ensure that the brown rice contains ≤10 grains / kg of paddy.

[0050] In some embodiments of the present invention, the equipment for the third gravity separation treatment includes a third gravity rice-rough separator, the screen surface of the third gravity rice-rough separator has a lateral inclination angle of 8 to 12°; the screen surface of the third gravity rice-rough separator has a longitudinal inclination angle of 6.5 to 8°; the screen surface vibration frequency of the third gravity rice-rough separator is 5.4 to 6.0 Hz; the screen surface amplitude of the third gravity rice-rough separator is 16 to 19 mm; the discharge port of the third gravity rice-rough separator includes a sixth rice-rough mixture discharge port and a fifth clean rice discharge port. In the technical solution of the present invention, similar to the first gravity rice-rough separator, the third gravity rice-rough separator is also provided with two discharge ports, and the rice-rough ratio in the sixth rice-rough mixture is similar to that of the first rice-rough mixture and the second rice-rough mixture, which can be used in the next round of process to be mixed with the first rice-rough mixture and the second rice-rough mixture and then enter the second gravity rice-rough separator for processing, thereby reducing the waste of raw materials.

[0051] In some embodiments of the present invention, the equipment for the first shelling process and / or the second shelling process includes a rice husking machine, the rice husking machine includes a first rubber roller and a second rubber roller, the rotation speed of the first rubber roller is greater than the rotation speed of the second rubber roller: the rotation speed of the first rubber roller is 14.5-17.0 m / s; the rotation speed of the second rubber roller is 12.5-14.0 m / s; the linear speed difference between the first rubber roller and the second rubber roller is 2.6-3.6 m / s; the spacing between the first rubber roller and the second rubber roller is 1.0-2.5 mm. The rubber roller speed and the spacing between the rubber rollers of the rice husking machine within the above range can ensure a high shelling efficiency.

[0052] In some embodiments of the present invention, the color sorting equipment includes a color sorter: the accuracy of the color sorter is 85% to 95%, and the sensitivity of the color sorter is 100 to 150. The accuracy and sensitivity of the color sorter within the above range can improve the distinction between rice and brown rice in the third clean rice, better and faster identify the brown rice and spray it out, and reduce the roughness content of the fifth clean rice. The color sorter only needs to be selected once to ensure the purity of the clean rice, without considering the carry-out ratio. The process is simple and the cost is low. It can effectively ensure that the clean rice has a low roughness content, and the optimal roughness content of the fifth clean rice is ≤2%.

[0053] This combined process mainly has three key control points. The first is the outlet of the cobblestones of similar size in the specific gravity stoner; the second is the brown rice outlet of the second gravity paddy and brown rice separator; the third is the inlet of the huller: In some embodiments of the present invention, in step S10, the mass percentage of brown rice in the cobblestones of similar size removed is ≤2%, and the content of cobblestones of similar size in the first paddy and brown rice mixture is ≤1 grain / kg. In step S30, the mass percentage of brown rice in the first clean paddy is ≤2%. In step S401b, the mass percentage of brown rice in the third clean paddy is ≤2%, and the content of paddy in the brown rice is ≤10 grains / kg. By controlling the outlet indexes of the three key control points, the raw material loss can be effectively reduced. At the same time, the content of brown rice in the raw paddy rice entering the huller and the return hulled rice is reduced, the phenomenon of cracked kernels and broken brown rice is reduced, and further the generation of broken rice is reduced, and the rice yield and head rice yield are improved.

[0054] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0055] Example 1

[0056] A method for combined treatment of brown rice outside the paddy and hulled rice containing brown rice includes the steps as Figure 1 described. Specifically:

[0057] S10. 1000 kg of Nanjing 46 paddy (containing 0.63 kg of cobblestones of similar size and 81.2 kg of brown rice outside the paddy) is conveyed into the inlet of a specific gravity stoner of model MTCG-150 produced by Bühler for specific gravity classification treatment. The parameters of the specific gravity classification treatment are: unit flow rate 80 kg / (cm·h), screen surface inclination angle 8.5°, average wind speed 1.258 m / s, vibration frequency 16.7 Hz, vibration amplitude 5.0 mm, and negative pressure 75 mmH2O. After the specific gravity classification treatment, 0.67 kg is obtained at the cobblestones of similar size outlet, the mass percentage of brown rice outside the paddy in the cobblestones of similar size is 5.97%, and 999.33 kg is obtained at the first paddy and brown rice mixture outlet, and the content of brown rice outside the paddy in the first paddy and brown rice mixture is 8.13%;

[0058] S20. 999.33 kg of the first paddy and brown rice mixture is conveyed into the inlet of a gravity paddy and brown rice separator of model MGCZ80B produced by Hunan Chenzhou Grain and Oil Machinery Co., Ltd. for the first gravity separation treatment. The parameters of the first gravity separation treatment are: screen surface transverse inclination angle 9.0°, screen surface longitudinal inclination angle 7.5°, vibration frequency 5.4 Hz, and amplitude 19 mm. After the first gravity separation treatment, 90.78 kg of the second paddy and brown rice mixture and 908.55 kg of the first clean paddy (containing 1.41% brown rice) are obtained, and the content of brown rice outside the paddy in the second paddy and brown rice mixture is 75.35%;

[0059] S30. Convey 908.55 kg of the first cleaned paddy into the feed inlet of a MLGQ25D type rice huller produced by Hunan Chenzhou Grain and Oil Machinery Co., Ltd. for hulling treatment. The hulling treatment parameters are: the fast roll speed is 16.5 m / s, the slow roll speed is 13.3 m / s, the linear speed difference between the fast roll and the slow roll is 3.2 m / s, and the distance between the fast roll and the slow roll is 1.8 mm. After the first hulling treatment, 749.32 kg of the third paddy-brown rice mixture is obtained, and the content of brown rice in the third paddy-brown rice mixture is 87.64%;

[0060] S401a. Mix 90.78 kg of the second paddy-brown rice mixture and 749.32 kg of the third paddy-brown rice mixture and then convey them into the feed inlet of an MGCZ80B type gravity paddy-brown rice separator produced by Hunan Chenzhou Grain and Oil Machinery Co., Ltd. for the second gravity separation treatment. The second gravity separation treatment parameters are: the transverse inclination angle of the sieve surface is 17°, the longitudinal inclination angle of the sieve surface is 9°, the vibration frequency is 6.0 Hz, and the amplitude is 16 mm. After the second gravity separation treatment, 126.02 kg of the fourth paddy-brown rice mixture, 504.06 kg of brown rice and 210.02 kg of the third cleaned paddy are obtained;

[0061] S402a. Convey 210.02 kg of the third cleaned paddy into the feed inlet of an MGCZ40 type gravity paddy-brown rice separator produced by Hunan Chenzhou Grain and Oil Machinery Co., Ltd. for the third gravity separation treatment. The parameters of the third gravity separation treatment are: the transverse inclination angle of the sieve surface is 10°, the longitudinal inclination angle of the sieve surface is 8°, the vibration frequency is 5.6 Hz, and the amplitude is 18 mm. 164.63 kg of the fourth cleaned paddy and 45.39 kg of the fifth paddy-brown rice mixture are obtained.

[0062] Example 2

[0063] The difference between Example 2 and Example 1 is that:

[0064] Step S402a is replaced with: Convey 210.02 kg of the third cleaned paddy into a SC192R type color sorter produced by Anhui Jiesun Optoelectronic Technology Co., Ltd. for color sorting treatment. The color sorting treatment parameters are: the color sorting accuracy is 85%, and the sensitivity is 120. After the color sorting treatment, 177.17 kg of the fifth cleaned paddy and 32.85 kg of the sixth paddy-brown rice mixture are obtained.

[0065] Comparative Example 1

[0066] In a large rice processing factory, the process is: specific gravity stoner - rice huller - gravity paddy-brown rice separator, which specifically includes the following steps:

[0067] (1) 1000 kg of Nanjing 46 rice (containing 0.63 kg of quartz and 81.2 kg of unpolished rice outside the rice) was input into a gravity stoner for gravity classification, and the rice and quartz were separated to obtain two materials, namely, rice and quartz, wherein the quartz contained 100 grains / kg of unpolished rice and the rice contained 8.24% of unpolished rice outside the rice. The parameters of the gravity classification were the same as those in Example 1.

[0068] (2) inputting the rice containing 8.24% of unpolished rice into a rice husker for husking to obtain a rice-unpolished mixture;

[0069] (3) The rice-brown mixture is fed into a gravity rice-brown separator to separate the rice, the rice-brown mixture and the brown rice. The rice (containing about 20% brown rice) is returned to the rice husker for husking again, the rice-brown mixture is returned to the machine for separation again, and the brown rice enters the next process.

[0070] Comparing Example 2 with Comparative Example 1, after the process modification, the brown rice content of the stone outlet of the stone remover was reduced from 100 grains / kg to 42 grains / kg through field processing sampling and yield analysis, and the brown rice content of the second clean rice entering the rice husker (the first clean rice and the fifth clean rice are combined and enter the rice husker together) was reduced from 8.24% to 1.87%. The yield of the whole rice of the production line increased by 0.6%. Calculated by 20 yuan / ton of rice per yield, the factory can process 100,000 tons of rice per year, and can generate 1.2 million yuan of added value, which is a significant effect.

[0071] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A combined treatment method for unpolished rice and unpolished rice from husked rice, characterized in that: The following steps are involved: S10, performing gravity classification on the rice containing the brown rice outside the rice grains and the side stones to remove the side stones, thereby obtaining a first brown rice mixture; S20, performing a first gravity separation process on the first rice-rough mixture to obtain a second rice-rough mixture and first clean rice grains; S30, performing a first husking process on the first clean rice to obtain a third rice-rough mixture; S40, mixing the second grain-rough mixture and the third grain-rough mixture and subjecting them to at least one gravity classification treatment to obtain brown rice and second clean rice grains, wherein the second clean rice grains are used for a second husking treatment.

2. The combined treatment method of off-grain brown rice and re-hulled brown rice according to claim 1, characterized in that: Step S40 includes: S401a, mixing the second grain-brown mixture and the third grain-brown mixture and performing a second gravity separation process to obtain a fourth grain-brown mixture, brown rice and third clean rice; S402a, subjecting the third clean rice to a third gravity separation process to obtain a mixture of fourth clean rice and fifth rough rice, wherein the fourth clean rice is used for a second husking process.

3. The combined treatment method of unpolished rice and husked rice according to claim 1, characterized in that: Step S40 includes: S401b, mixing the second grain-brown mixture and the third grain-brown mixture and performing a second gravity separation process to obtain a fourth grain-brown mixture, brown rice and third clean rice; S402b, subjecting the third clean rice to color sorting treatment to obtain a sixth rice-rough mixture and a fifth clean rice, wherein the fifth clean rice is used for a second husking treatment.

4. The combined treatment method of unpolished rice and husked rice according to claim 1, characterized in that: In step S10, the equipment for gravity classification processing includes a gravity classification stone removing machine: The air flow velocity of the gravity grading stone remover is 1.2-1.3 m / s; the screen surface inclination angle of the gravity stone remover is 5-9°; the unit flow rate of the gravity stone remover is 60-100 kg / (cm·h); the vibration frequency of the gravity stone remover is 16.7 Hz; the vibration amplitude of the gravity stone remover is 4.0-5.5 mm; the H2O of the gravity stone remover is 50-90 mm.

5. The combined treatment method of off-grain brown rice and re-hulled brown rice as claimed in claim 2, characterized in that: The equipment for the first gravity separation treatment includes a first gravity rice-rough separator, the lateral inclination angle of the screen surface of the first gravity rice-rough separator is 6-10°; the longitudinal inclination angle of the screen surface of the first gravity rice-rough separator is 6.5-8°; the vibration frequency of the screen surface of the first gravity rice-rough separator is 5.4-6.0 Hz; the amplitude of the screen surface of the first gravity rice-rough separator is 16-19 mm; the discharge port of the first gravity rice-rough separator includes a second rice-rough mixture discharge port and a first clean rice discharge port; and / or, The equipment for the second gravity separation treatment includes a second gravity rice-rough separator, the lateral inclination angle of the screen surface of the second gravity rice-rough separator is 12-18°; the longitudinal inclination angle of the screen surface of the second gravity rice-rough separator is 7-10°; the vibration frequency of the screen surface of the second gravity rice-rough separator is 5.4-6.0 Hz; the amplitude of the screen surface of the second gravity rice-rough separator is 16-19 mm; the discharge ports of the second gravity rice-rough separator include a fourth rice-rough mixture discharge port, a third clean rice discharge port and a brown rice discharge port; and / or, The equipment for the third gravity separation treatment includes a third gravity rice-rough separator, the lateral inclination angle of the screen surface of the third gravity rice-rough separator is 8 to 12°; the longitudinal inclination angle of the screen surface of the third gravity rice-rough separator is 6.5 to 8°; the vibration frequency of the screen surface of the third gravity rice-rough separator is 5.4 to 6.0 Hz; the screen surface amplitude of the third gravity rice-rough separator is 16 to 19 mm; the discharge ports of the third gravity rice-rough separator include a sixth rice-rough mixture discharge port and a fifth clean rice discharge port.

6. The combined treatment method of unpolished rice and re-hulled rice as claimed in claim 3, characterized in that: The equipment for the first hulling process and / or the second hulling process comprises a rice husker, and the rice husker comprises a first rubber roller and a second rubber roller, and the rotation speed of the first rubber roller is greater than the rotation speed of the second rubber roller: The rotation speed of the first rubber roller is 14.5-17.0 m / s; the rotation speed of the second rubber roller is 12.5-14.0 m / s; the linear speed difference between the first rubber roller and the second rubber roller is 2.6-3.6 m / s; the distance between the first rubber roller and the second rubber roller is 1.0-2.5 mm.

7. The combined treatment method of unpolished rice and husked rice as claimed in claim 3, characterized in that: The color sorting equipment includes a color sorter: The accuracy of the color sorter is 85% to 95%, and the sensitivity of the color sorter is 100 to 150.

8. The combined treatment method of off-grain brown rice and re-hulled brown rice as claimed in claim 1, characterized in that: In step S10, the mass percentage of brown rice in the removed husk is ≤2%, and the content of husk in the first grain-brown mixture is ≤1 grain / kg.

9. The combined treatment method of off-grain brown rice and re-hulled brown rice according to claim 1, characterized in that: In step S30, the mass percentage of brown rice in the first clean rice is ≤2%.

10. The combined treatment method of off-grain brown rice and re-hulled brown rice according to claim 3, characterized in that: In step S401b, the mass percentage of brown rice in the third clean rice is ≤2%, and the content of rice in the brown rice is ≤10 grains / kg.

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