Coix seed and white rice production and processing technology

Abstract

The invention discloses a production and processing technology of white myotonin. The production and processing technology comprises the following steps: S1, feeding; s2, first rice milling; s3, rice bin cooling; s4, second rice milling; s5, crushing and separating; s6, removing stones according to specific gravity; s7, washing with water; s8, spin-drying is carried out; s9, carrying out specific gravity separation; s10, primary color sorting; s11, primary grading; s12, carrying out secondary color sorting; s13, carrying out secondary grading; s14, removing stones; s15, a finished product warehouse; and S16, sub-packaging. Through three-stage countercurrent cleaning, the myotonin is bright in color and luster under the condition that no food additive is used. Through a manufacturing process of a non-standard centrifugal dehydrator, the water content of the coix seeds subjected to countercurrent cleaning is rapidly reduced to be within 13%, so that the coix seeds are stored at normal temperature in a sales link, and the inherent rice fragrance and nature of the coix seeds are reserved.

Description

Technical Field

[0001] The present invention relates to the technical field of food processing, and particularly relates to a production and processing technology for white coix seeds Background Art

[0002] White coix seeds, that is, white coix seed rice, have the following defects in the existing processing of coix seeds:

[0003] 1. High milling damage rate: Most of the existing rice milling processes adopt single-stage high-speed milling, and the rice grains bear concentrated mechanical stress, resulting in a broken rice rate as high as 8%-12%, causing the loss of nutrients;

[0004] 2. High mildew rate: In order to make the coix seeds look bright, the existing process mostly uses machinery to mill the coix seeds white. In this way, it is easy for oil to accumulate at the grooves of the coix seeds, so the coix seeds are prone to mildew and rancidity and are not easy to store.

[0005] The above defects seriously restrict the large-scale production of high-quality coix seeds. Therefore, it is urgent to develop a production and processing technology for high-quality coix seeds. Summary of the Invention

[0006] Aiming at the above technical deficiencies, the purpose of the present invention is to provide a production and processing technology for white coix seeds to solve the defects such as high milling damage rate and high mildew rate existing in the production and processing of existing white coix seeds.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a production and processing technology for white coix seeds, including the following steps:

[0008] S1. Feeding: Conveying raw materials;

[0009] S2. First rice milling:

[0010] Milling off the outer bran and the surface layer of brown rice;

[0011] S3. Cooling rice bin:

[0012] The milled rice grains enter the cooling rice bin in layers, cool for 45 minutes, balance the moisture inside and outside the rice grains, eliminate the milling stress, and reduce the risk of breakage in subsequent processing;

[0013] S4. Second rice milling:

[0014] Through low-speed fine milling by an iron roller rice mill, accurately peel off the remaining bran, and retain the integrity of the rice grain germ;

[0015] S5. Separation of whole and broken grains:

[0016] Through three-layer vibrating screen classification treatment, separate broken rice and extract whole rice;

[0017] S6. Specific gravity stone removal:

[0018] Sort rice grains by combining a vibrating screen and reverse air flow;

[0019] S7, Water washing:

[0020] Three-stage countercurrent cleaning:

[0021] S8, Centrifugal dewatering:

[0022] Quickly reduce the moisture content to less than 13% by a centrifugal dehydrator;

[0023] S9, Specific gravity separation:

[0024] Sort by the density of rice grains for the second time, separate rice grains of different maturities through the difference in suspension velocity, and high-density rice grains enter the super-grade product channel;

[0025] S10, First color sorting:

[0026] Identify obvious defects such as yellowed and mildewed grains through a visible light CCD color sorter, and reject defective grains through a dual-channel high-speed spray valve;

[0027] S11, First grading:

[0028] Sort by length through a horizontal rotary grading screen:

[0029] S12, Second color sorting:

[0030] Detect hidden lesions and identify mildew through a hyperspectral imager;

[0031] S13, Second grading:

[0032] Secondarily grade by bulk density through a vibrating separator to ensure the plumpness of rice grains;

[0033] S14, Stone removal:

[0034] Secondarily remove impurities through a high-precision specific gravity separator, and separate abnormally dense impurities through the synergistic action of a vibrating table and upward air flow;

[0035] S15, Finished product warehouse:

[0036] Through normal temperature storage;

[0037] S16, Packaging:

[0038] Adopt vacuum packaging through a fully automatic packaging line, with the packaging specification error ≤ ±2g, and store in the warehouse after labeling.

[0039] Preferably, in the step S5, the three-layer vibrating screen grading treatment includes

[0040] The upper sieve intercepts unhulled grains for rework,

[0041] The middle - layer sieve extracts complete rice grains.

[0042] The lower - layer sieve separates broken rice.

[0043] Preferably, in the step S6,

[0044] Separate light impurities through a vibrating sieve;

[0045] Remove heavy impurities by reverse air flow using specific gravity differences; thus ensuring the cleanliness of the raw materials.

[0046] Preferably, in the step S7, remove impurities and bran by the impact of washing water flow.

[0047] The beneficial effects of the present invention are as follows: After three - stage counter - current cleaning, without using food additives, the coix seeds have a bright color. Through the manufacturing process of a non - standard centrifugal dehydrator, the water content of the coix seeds after counter - current cleaning can be quickly reduced to within 13%, enabling the coix seeds to be stored at room temperature during the sales process and retaining the inherent rice fragrance and natural flavor of the coix seeds. Specific Embodiments

[0048] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0049] Embodiment: The present invention provides a production and processing technology for coix seed white rice, including the following steps:

[0050] S1. Feeding:

[0051] Use a variable - frequency vibrating feeder to uniformly transport raw materials, intercept large - particle impurities through a primary sieve (aperture Φ5mm), and simultaneously start a magnetic separation device to adsorb iron filings and metal debris. The feeding flow rate is stably controlled at 800 - 1000 kg / h.

[0052] S2. First rice milling (coarse milling):

[0053] The sand - roll rice mill mills at a medium speed to remove the outer bran and the surface layer of brown rice, and control the hulling rate at 85 - 90%.

[0054] S3. Cooling rice bin:

[0055] The milled rice grains enter the cooling rice bin in layers, and are cooled for 45 minutes through a circulating cold air system (18 - 20°C) to balance the internal and external moisture of the rice grains to 12.5% ± 0.5%, eliminate the milling stress, and reduce the risk of subsequent processing breakage.

[0056] S4. Second rice milling (fine milling):

[0057] The iron roller rice mill performs low-speed fine milling, adopts progressive pressure adjustment (0.08 MPa → 0.05 MPa), precisely peels off the residual bran, retains the integrity of the rice germ, the final product has a whole rice rate of ≥ 92% and a broken rice rate of ≤ 3%.

[0058] S5. Whole and broken separation:

[0059] Three-layer vibrating screen for grading treatment:

[0060] The upper sieve intercepts the unhulled grains for rework

[0061] The middle sieve extracts the whole rice

[0062] The lower sieve separates the broken rice

[0063] Combined with a negative pressure air separation system, the whole rice extraction rate is ≥ 95%.

[0064] S6. Specific gravity stone removal:

[0065] Combined vibrating screen and reverse air flow separation:

[0066] The vibrating screen (amplitude 3 - 5 mm) separates light impurities such as straw and sand;

[0067] The reverse air flow (wind speed 7 m / s) uses the specific gravity difference to remove heavy impurities such as stones and glass fragments, and the impurity removal rate is > 99%, ensuring the cleanliness of the raw materials.

[0068] S7. Water washing:

[0069] Three-stage countercurrent cleaning:

[0070] S8. Centrifugal drying:

[0071] The centrifugal dehydrator (rotation speed 1200 r / min) quickly removes the surface moisture, the processing time is ≤ 90 seconds, and the moisture content of the rice grains is reduced to below 13%, avoiding optical interference in subsequent color sorting.

[0072] S9. Specific gravity sorting:

[0073] Sorting by rice grain density for the second time, separating rice grains of different maturities through the difference in suspension speed (4.5 - 5.5 m / s), and the high-density rice grains (bulk density ≥ 680 g / L) enter the special grade product channel.

[0074] S10. First color sorting (primary screening):

[0075] The visible light CCD color sorter identifies obvious defects such as yellowed grains and mildewed grains, and the dual-channel high-speed spray valve (response time ≤ 1 ms) removes the defective grains, and the defective grain removal rate is ≥ 98%.

[0076] S11. First grading:

[0077] The horizontal rotary grading sieve sorts by length:

[0078] S12. Secondary color sorting (fine screening):

[0079] The hyperspectral imager (400 - 1000nm) detects hidden lesions, identifies mildew (absorption peaks at 580nm / 620nm), and the recognition accuracy of lesion grains is ≥99.5%.

[0080] S13. Secondary grading:

[0081] The vibrating separator conducts secondary grading by bulk density to ensure the consistency of rice grain plumpness and nutritional quality.

[0082] S14. Stone removal (secondary impurity removal):

[0083] The high-precision specific gravity separator removes impurities for the second time. Through the synergistic effect of the vibrating table and the upward air flow, impurities with abnormal density are separated.

[0084] S15. Finished product warehouse:

[0085] Through normal temperature storage.

[0086] S16. Sub-packaging:

[0087] The full-automatic packaging line uses vacuum packaging (residual oxygen content < 1%), the packaging specification error is ≤ ±2g, and it is stored in the warehouse after labeling.

[0088] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A production and processing technology for coix rice white rice, characterized in that, It includes the following steps: S1. Feeding: Transport raw materials; S2. First rice milling: Mill off the outer bran and the surface layer of paddy rice; S3. Cooled rice bin: The milled rice grains enter the cooled rice bin in layers, are cooled for 45 minutes, balance the moisture inside and outside the grains, eliminate the milling stress, and reduce the risk of breakage in subsequent processing; S4. Second rice milling: Fine mill at a low speed through an iron roller rice mill, precisely peel off the remaining bran, and retain the integrity of the rice germ; S5. Broken rice separation: Classify through a three-layer vibrating screen, separate broken rice, and extract whole rice; S6. Specific gravity stone removal: Separate rice grains through a combined vibrating screen and reverse air flow; S7. Washing: Three-stage countercurrent cleaning: S8. Drying: Quickly reduce the moisture to less than 13% through a centrifugal dehydrator; S9. Specific gravity separation: Perform secondary separation according to the density of rice grains, separate rice grains of different maturities through the difference in suspension speed, and the high-density rice grains enter the special grade channel; S10. First color sorting: Identify obvious defects such as yellowed grains and mildewed grains through a visible light CCD color sorter, and remove defective grains through a two-channel high-speed spray valve; S11. First grading: Sort by length through a horizontal rotary grading screen: S12. Second color sorting: Detect hidden lesions through a hyperspectral imager and identify mildew; S13. Second grading: Perform secondary grading according to the bulk density through a vibrating separator to ensure the plumpness of rice grains; S14. Stone removal: Perform secondary impurity removal through a high-precision specific gravity separator, and separate impurities with abnormal density through the synergistic action of a vibrating table and upward air flow; S15. Finished product bin: Through normal temperature storage; S16. Packaging: Adopt vacuum packaging through a fully automatic packaging line, the packaging specification error ≤ ±2g, and store in the warehouse after labeling.

2. The production and processing technology of coix white rice according to claim 1, characterized in that, In the step S5, the three-layer vibrating screen classification treatment includes The upper screen intercepts the unhulled grains for rework, The middle screen extracts the complete rice grains, The lower screen separates the broken rice.

3. A processing technology for coix rice white rice as described in claim 1, characterized in that, In the step S6, Separate light impurities through a vibrating screen; Remove heavy impurities through centrifugal separation using the specific gravity difference; thus ensuring the cleanliness of raw materials.

4. A coix rice and white rice production and processing technology according to claim 1, characterized in that, In the step S7, remove impurities and bran through the impact of washing water flow.