With the growth of the world's population, food production has been elevated to a strategic position. As one of the basic grains, the production and processing of rice is also highly valued by countries. As a necessary equipment for rice processing, rice milling equipment plays a vital role in improving the utilization rate of grain. Japan's rice milling technology is in a leading position in the world. Although my country's rice milling machines are constantly improving and innovating, and some of them have been in line with international standards, there is still a certain gap between the overall technical level and foreign advanced technologies. Technical R&D personnel and rice milling enterprises have been aiming at high efficiency, energy saving, cost reduction, and improvement of rice quality, constantly making up for the shortcomings of existing rice milling machines and adding new design concepts.
1 Development status of rice mill equipment at home and abroad
At present, there are many kinds of rice mill equipment at home and abroad. According to the mode of whitening, it can be divided into: wipe-off type rice mill equipment, milling type rice mill equipment and hybrid rice mill equipment, no matter which one it is. The main components of this type of rice milling machine are: feeding device, whitening chamber, discharging device, transmission device, air spray system and rack.
1.1 Wipe-off type rice milling machine equipment
The wipe-off type rice mill equipment uses the friction between the rice grains and the whitening chamber components and the rice grains and the rice grains to whiten brown rice. The typical wipe-off type rice mill equipment is iron roller rice mill equipment. The rice grains processed by the iron roller rice mill have the advantages of fine and glossy surface, and the milled rice bran contains less starch. However, the pressure of the rice grains in the rice mill equipment is relatively large, and the local pressure will exceed the strength of the rice grains, which is easy to produce broken rice. Therefore, the iron roller rice mill equipment cannot be replaced and needs continuous improvement and innovation because of its insufficiency.
The development of my country's iron roller rice mill equipment started from the improvement of the horizontal iron roller rice mill equipment introduced from the United Kingdom, and has undergone transformations again and again. At present, the iron roller rice mills commonly used in China include horizontal iron roller jet rice mills and vertical iron roller rice mills. There are many types of iron roller rice mills, but their main components are The parts are basically the same, and they are all composed of feeding device, whitening room, air spray device, chaff collecting device, transmission device and frame. In addition, there are also some iron roller rice mill equipment equipped with auxiliary devices, such as A6 vertical iron roller rice mill equipment, which not only has a beautiful appearance but also is equipped with a vacuum cleaner, which can quickly solve the blockage situation and provide a guarantee for the smooth progress of production. ;MNMP series iron roller rice mill equipment (Figure 1), not only has the characteristics of high output, less crushing, and good process effect, but also adds a water spray mechanism, which can be used to mill rice when necessary, and has a good polishing effect.
The foreign iron roller rice mill equipment originated in Europe as early as the 19th century, and Japan began to use the iron roller rice mill equipment in the 19th century and developed rapidly. At present, the VBF7B-C/MC vertical iron roller rice mill equipment produced in Japan (Fig. 2) has the same main components as in China, but the feeding device is set at the bottom of the whitening chamber, and the discharging device is set at the whitening chamber. In the upper part of the chamber, its unique design method is very beneficial for the rice milling equipment group to process polished rice, eliminating the need for intermediate material conveying equipment, which can reduce the damage to the rice grains during the conveying process. In addition, the iron rollers and rice screen of the whitening chamber adopt a split structure, which is easy to disassemble and assemble. When this type of rice milling machine is working, the action of gravity and the direction of movement of the rice flow are opposite, so that the density of rice grains in the whitening room increases, and the rice grains are evenly distributed on the cross section of the entire whitening room, so it has a good whitening effect.
1.2 Milling type rice milling machine equipment
Grinding type rice mill equipment is to use high-speed rotating rollers coated with emery grains to grind brown rice, so as to achieve the effect of whitening, typical of sand roller rice mill equipment. This type of rice mill equipment produces less broken rice during the rice milling process, but the milled rice bran contains a lot of starch, and the precision of the finished rice is uneven. Therefore, in the rice milling process, the sand roller rice mill equipment is generally used for roughening , in order to ensure the smooth progress of the next process.
The domestic sand roller rice mill equipment has developed rapidly, and the traditional rice mill equipment has been continuously improved and innovated. For example, the NF type rotary screen air jet rice mill equipment, the whitening chamber adopts the cantilever structure, and the hexagonal screen drum and the sand roller rotate in the same direction. , the rotation speed is lower than that of the sand roller. Because the sand roller and the hexagonal rotary screen work together to make the rice grains roll, the rice grains have more chances to be milled, and the whitening effect is better. The new "waterfall" rice milling machine equipment developed by Muyang Group eliminates the screw conveyor part of the feeding device. After the material enters the whitening room by its own gravity, the length direction of the sand roller contacts the material at the same time. The rolling method of the grain mill is similar, which avoids the phenomenon of excessive local wear of the sand rollers, and improves the phenomenon of inconsistent wear of the sand rollers and waste of materials in the traditional sand roller rice mill equipment. In addition, the machine uses four rollers to work at the same time, and the four rollers are arranged in an S-shape from top to bottom, which greatly improves the production efficiency. With the development of global industry towards intelligence, the rice milling industry is no exception. The MNMD65 high-performance energy-saving rice milling machine that passed the appraisal in 2011 has a unique and innovative structure of the whitening chamber. The annular sand belt is used as the main working part, and the rice milling process is intelligent. automatic control.
In addition to the horizontal and vertical sand roller rice mill equipment in China, the MNMS25D strong-pulling oblique sand roller rice mill equipment developed in Changzhou, Jiangsu Province (Fig. 3), is specially used for brown rice, which is reliable in performance, beautiful in appearance and easy to operate. Convenient, the inclined whitening chamber makes the machine high output, less crushing, and more adequate bran discharge.
In foreign countries, the VTA7A-C vertical sand roller rice mill equipment (Fig. 4) produced by Satake in Japan is representative. Its main structure is basically the same as that in China, mainly including feeding device, whitening room, discharging device, suction air It is composed of parts such as device, transmission device and frame. The main shaft is supported by a cantilever, the transmission parts are located under the whitening chamber, and the sand roller can be easily pulled out from the top of the machine; the screen is designed to be taken out from the side of the machine, and the screen replacement is quick and easy without removing the machine frame; the whitening chamber is almost It is twice the whitening area of ​​traditional equipment, and the machine occupies a small area and has high output. There is a rotary discharger in the lower part of the grinding chamber, which helps the rice bran to be discharged out of the machine smoothly.

1.3 Hybrid rice milling machine equipment
The hybrid rice mill equipment combines the advantages of the wipe-off type rice mill equipment and the milling type rice mill equipment, and has a good process effect. The horizontal NS type spiral groove sand roller rice milling machine commonly used in our country has a structure of upper sand and lower iron. Small rice grains will not produce over-grinding. The rice grains from the sand roller whitening room enter the iron roller whitening room for fine grinding.
The processed rice grains are bright in color and less broken rice. MNML series vertical double-roller rice mill equipment (Figure 5) is characterized by low-level feeding and high-level discharging, and the use of suction system to absorb bran and reduce rice temperature. It has the characteristics of uniform whitening, less broken rice, and high rice yield. .
Satake in Japan has developed a new type of hybrid rice milling machine equipment SAFF3G hybrid rice milling machine equipment (Figure 6). It adopts a unique design form of one machine with three rollers (sand-iron-iron), with compact structure and convenient maintenance. It saves energy and has a good effect of removing bran, achieving the effect of one machine with multiple functions. Recently, a new hybrid VBW5A rice milling machine was launched. Its design is based on the concept of integrating the sand roller and the iron roller rice machine. The iron roller is organically integrated into the sand roller, so that the rice is ground by the sand roller and the iron roller is rubbed, thus realizing the sand and iron roller rice. The organic parallel connection of the machine greatly saves the processing time and cost.
2 Conclusion
Throughout the development of rice milling machine equipment in the world, rice milling machine equipment is constantly improving and innovating, and generations of rice milling machine equipment continue to come out. The purpose is to improve work efficiency, output, rice quality, save energy and reduce broken rice. efficiency, saving resources, reducing costs, and ultimately solving the food problem of mankind. Although the current domestic and foreign rice mill equipment technology has matured, but there are still shortcomings. Science and technology are advancing, and the development of rice milling equipment will not stop. The development of rice milling equipment will continue to advance with the increasing material and cultural needs of people.
When buying rice milling machine equipment, be sure to consider the after-sales service quality of rice milling machine equipment manufacturers. Although the rice milling machine equipment is a simple product, the equipment will work abnormally for a long time. Therefore, before purchasing, it is necessary to check the after-sales service of the rice milling machine equipment production company, and then decide which company and which well-known brand to buy. The key to after-sales service is to check whether the production enterprise or market sales unit has the working ability of "Three Guarantees". Does the content of the "Three Guarantees" certificate include: product name, specification model, model specification and product original serial number; manufacturer's name, detailed address, telephone, zip code; repairer's name, detailed address, telephone, Zip code and maintenance records; whether the validity period of "three guarantees" for the entire equipment and key components is December;
2. When buying rice milling machine equipment, be sure to consider the after-sales service quality of rice milling machine equipment manufacturers. Although the rice milling machine equipment is a simple product, the equipment will work abnormally for a long time. Therefore, before purchasing, it is necessary to check the after-sales service of the rice milling machine equipment production company, and then decide which company and which well-known brand to buy. The key to after-sales service is to check whether the production enterprise or market sales unit has the working ability of "Three Guarantees". Does the content of the "Three Guarantees" certificate include: product name, specification model, model specification and product original serial number; manufacturer's name, detailed address, telephone, zip code; repairer's name, detailed address, telephone, Zip code and maintenance records; whether the validity period of "three guarantees" for the entire equipment and key components is December;
When buying rice milling machine equipment, be sure to consider the after-sales service quality of rice milling machine equipment manufacturers. Although the rice milling machine equipment is a simple product, the equipment will work abnormally for a long time. Therefore, before purchasing, it is necessary to check the after-sales service of the rice milling machine equipment production company, and then decide which company and which well-known brand to buy. The key to after-sales service is to check whether the production enterprise or market sales unit has the working ability of "Three Guarantees". Does the content of the "Three Guarantees" certificate include: product name, specification model, model specification and product original serial number; manufacturer's name, detailed address, telephone, zip code; repairer's name, detailed address, telephone, Zip code and maintenance records; whether the validity period of "three guarantees" for the entire equipment and key components is December;