CN112642511B - Rice processing method - Google Patents

Abstract

The invention discloses a rice processing method, and relates to the technical field of rice processing. According to the rice processing method, after rice with the length close to h is screened in the drum sieve twice, rice with the grain diameter close to d is obtained through the screen twice, and after the rice with the length being h and the grain diameter being d and with the uniform size is selected, subsequent rice hulling and milling operations are carried out, meanwhile, accurate limitation is also carried out on processing parts of equipment in the rice hulling and milling operations, so that the accurate processing of the rice hulling and milling equipment on the rice can be improved, and the blank remaining rate in the rice processing is improved.

Description

Rice processing method

Technical Field

The invention relates to the technical field of rice processing, in particular to a rice processing method.

Background

The rice processing refers to a process of removing rice husks (glumes) and skin layers (bran layers). The rice grain consists of husk, cortex, embryo and endosperm, and the weight percentage of each part is as follows: 18-21% of rice husk, about 6% of cortex, 66-70% of endosperm and 2-3% of embryo. The chemical components of the components are greatly different, wherein the fiber content of the chaff is as high as 40%, and the chaff has no great nutritional value; the cortex is rich in protein and fat, but also contains more fiber; the embryo contains a large amount of protein, fat and vitamins; the endosperm contains the most carbohydrate and the least fiber. The purpose of rice processing is to separate the endosperm from the rest with minimal disruption, thereby producing rice with better eating qualities.

The germ rice is the polished rice with the germ retention rate of more than 80 percent, but the processing of the germ rice is difficult, and the difficulty is as follows: the connection between the germ and the cortex is relatively tight, and the germ of the rice is very easy to remove when the cortex of the rice is removed; difficulty two: the adaptability of the processing equipment and the method of the germ rice is poor, and the germ on the brown rice is removed in the rice milling process due to different sizes of the brown rice in the further processing of the brown rice (rice with a large amount of germ remaining) in the traditional process.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a rice processing method, which solves the problem of low germ retention rate after milling brown rice in the traditional process.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a rice processing method comprises rice, brown rice, polished rice, selected rice, rice huller and rice milling, wherein the length of the polished rice is h, and the particle size of the polished rice is d, and comprises the following steps:

s1, selecting rice:

s11: winnowing the rice;

s12: carrying out magnetic separation on the paddy treated by the S11;

s13: placing the paddy rice treated by the S12 into a first drum screen for screening, wherein screen holes of the first drum screen are in a bent pipe shape, the curvature radius of the left wall and the curvature radius of the right wall of the screen holes of the first drum screen are the same, and the end point connecting line distance of the left wall of the screen holes of the first drum screen is equal to h +0.1mm (+ -0.05 mm);

s14: putting the paddy rice which passes through the first drum screen into a second drum screen for screening, wherein the screen holes of the second drum screen are bent pipe-shaped, the curvature radius of the left wall and the right wall of the screen holes of the second drum screen are the same, and the connecting line distance of the end points of the left wall of the screen holes of the second drum screen is equal to hmm (-0.05 mm);

s15: placing the paddy left on the second rotary screen into a screen with the diameter of d +0.1mm (+ -0.05mm) for screening;

s16: placing the paddy rice which passes through a screen with d +0.1mm (+ -0.05mm) into a screen with dmm (-0.05mm) for screening;

s17: the rice left on the screen of dmm (-0.05mm) was collected;

s2: hulling rice;

s21: putting the paddy collected in the S17 into a rubber roller rice huller for hulling paddy, wherein the distance between two rubber rollers of the rubber roller rice huller is d-0.1 mm;

s22: placing the paddy treated by the S21 into a selected brown rice flat rotary screen for screening, taking the paddy passing the screening as brown rice and entering the next working procedure, and returning the paddy not passing the screening to the S21 again for hulling the paddy;

s3: rice milling:

s31: putting brown rice into an iron roller rice mill, wherein the distance between rice knives of the iron roller rice mill is more than one half h and less than one half h plus one half d, and the brown rice treated by the iron roller rice mill is polished rice;

s32: and packaging the polished rice processed by the S31.

The invention provides a method for processing rice. The method has the following beneficial effects:

according to the rice processing method, after rice with the length close to h is screened in the drum sieve twice, rice with the grain diameter close to d is obtained through the screen twice, and after the rice with the length being h and the grain diameter being d and with the uniform size is selected, subsequent rice hulling and milling operations are carried out, meanwhile, accurate limitation is also carried out on processing parts of equipment in the rice hulling and milling operations, so that the accurate processing of the rice hulling and milling equipment on the rice can be improved, and the blank remaining rate in the rice processing is improved.

Drawings

FIG. 1 is a conventional trommel screen aperture;

FIG. 2 is a screen hole of a drum screen in a shape of a bent pipe;

FIG. 3 is a schematic view showing the rice passing through the holes of a "bent tube-shaped" drum sieve (the rice can not pass through the holes);

FIG. 4 is a microscopic view of the increased blank retention rate of a suitable rice knife spacing;

fig. 5 is a schematic view of a polished rice size.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

the length of polished rice is 2.9mm, and the particle diameter of polished rice is 1mm, its characterized in that: the method comprises the following steps:

s1, selecting 20kg of rice:

s11: winnowing the rice;

s12: carrying out magnetic separation on the paddy treated by the S11;

s13: placing the paddy rice treated by the S12 into a first drum screen for screening, wherein screen holes of the first drum screen are in a bent pipe shape, the curvature radius of the left wall and the curvature radius of the right wall of the screen holes of the first drum screen are the same, and the end point connecting line distance of the left wall of the screen holes of the first drum screen is equal to 3mm (+/-0.05 mm);

s14: putting the paddy rice which passes through the first drum screen into a second drum screen for screening, wherein the screen holes of the second drum screen are bent pipe-shaped, the curvature radius of the left wall and the right wall of the screen holes of the second drum screen are the same, and the connecting line distance of the end points of the left wall of the screen holes of the second drum screen is equal to 2.9mm (-0.05 mm);

s15: placing the paddy left on the second rotary screen into a screen mesh of 1.1mm (+ -0.05mm) for screening;

s16: placing the rice passing through a 1.1mm (+ -0.05mm) sieve into a 1mm (-0.05mm) sieve

Screening by a net;

s17: collecting the rice left on a 1mm (-0.05mm) screen;

s2: hulling rice;

s21: putting the paddy collected in the S17 into a rubber roller rice huller for hulling paddy, wherein the distance between two rubber rollers of the rubber roller rice huller is 0.9 mm;

s22: placing the paddy treated by the S21 into a selected brown rice flat rotary screen for screening, taking the paddy passing the screening as brown rice and entering the next working procedure, and returning the paddy not passing the screening to the S21 again for hulling the paddy;

s3: rice milling:

s31: putting brown rice into iron roller rice mill, wherein the distance between rice knives of the iron roller rice mill is more than 1.45mm

Less than 1.95mm, the brown rice processed by the iron roller rice mill is polished rice;

s32: and packaging the polished rice processed by the S31.

The iron roller rice mill has the advantages that the distance between rice knives is larger than one half of the length of polished rice and smaller than the length of the polished rice plus one half of the radius of the polished rice in the rice milling process, the probability that the germs are accidentally injured by the rice knives can be greatly reduced, the length of the polished rice is set to be 2.9mm, the particle size of the polished rice is 1mm, the length of the germs is 0.3mm, the distance between the rice knives is larger than 1.45mm and smaller than 1.95mm, the height of the rice knives is 0.3mm, and after Matlab modeling calculation, the probability that the rice knives touch the germs is smaller than 15%.

Example processing results: 13kg of polished rice is finally obtained, 1000 polished rice grains are randomly sampled from the polished rice for blank retention rate analysis, the number of the polished rice grains with germs is 863 grains, and the blank retention rate exceeds 80%.

In conclusion, the rice processing method obtains the rice with the grain diameter close to d by twice screening the rice with the length close to h in the drum sieve and then twice screening, selects the rice with the length of h and the grain diameter of d and then carries out subsequent rice hulling and milling operations, and simultaneously accurately limits the processing parts of the equipment in the rice hulling and milling operations, so that the rice hulling and milling equipment can accurately process the rice, and the blank remaining rate in the rice processing is improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1. A rice processing method comprises rice, brown rice, polished rice, selected rice, rice huller and rice milling, wherein the length of the polished rice is h, and the particle size of the polished rice is d, and the method is characterized in that: the method comprises the following steps:

s1, selecting rice:

s11: winnowing the rice;

s12: carrying out magnetic separation on the paddy treated by the S11;

s13: placing the paddy rice treated by the S12 into a first drum screen for screening, wherein screen holes of the first drum screen are in a bent pipe shape, the curvature radius of the left wall and the curvature radius of the right wall of the screen holes of the first drum screen are the same, and the end point connecting line distance of the left wall of the screen holes of the first drum screen is equal to h +0.1mm (+ -0.05 mm);

s14: putting the paddy rice which passes through the first drum screen into a second drum screen for screening, wherein the screen holes of the second drum screen are bent pipe-shaped, the curvature radius of the left wall and the right wall of the screen holes of the second drum screen are the same, and the connecting line distance of the end points of the left wall of the screen holes of the second drum screen is equal to hmm (-0.05 mm);

s15: placing the paddy left on the second rotary screen into a screen with the diameter of d +0.1mm (+ -0.05mm) for screening;

s16: placing the paddy rice which passes through a screen with d +0.1mm (+ -0.05mm) into a screen with dmm (-0.05mm) for screening;

s17: the rice left on the screen of dmm (-0.05mm) was collected;

s2: hulling rice;

s21: putting the paddy collected in the S17 into a rubber roller rice huller for hulling paddy, wherein the distance between two rubber rollers of the rubber roller rice huller is d-0.1 mm;

s22: placing the paddy treated by the S21 into a selected brown rice flat rotary screen for screening, taking the paddy passing the screening as brown rice and entering the next working procedure, and returning the paddy not passing the screening to the S21 again for hulling the paddy;

s3: rice milling:

s31: putting brown rice into an iron roller rice mill, wherein the distance between rice knives of the iron roller rice mill is more than one half h and less than one half h plus one half d, and the brown rice treated by the iron roller rice mill is polished rice;

s32: and packaging the polished rice processed by the S31.

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