Rice polishing machine working principle and structural characteristics
First, after the brown rice is whitened by multiple machines, the broken rice and the bracts are removed, and after the water is sprayed and the rice is moistened (the binding force between the endosperm and the rice bran is reduced, since the added water is small, only a layer is formed on the surface of the rice grains. The thin film, combined with the polishing time is not long, has no effect on the moisture content of the rice), and then enters the polishing chamber of the polishing machine to glaze the surface of the rice grain by friction under a certain pressure and temperature. Through the polishing treatment, not only can the surface of the rice grain be floated, but also the starch on the surface of the rice grain can be pre-gelatinized and gelatinized. The starch gelatinization can make up the crack, thereby obtaining the appearance quality of the color and smoothness, improving the storage performance and practicality of the rice. Quality, so rice polishing is very necessary.
The main structural features and functions of rice polishing machine and the requirements for design:
The main structures of various types of polished rice machines are similar, mainly consisting of a sprayed water part, a polished part, a water supply system and a blowing mechanism. The feeding device and the discharging device are also important devices for various types of polished rice machines.
1. Spraying the water part The sprayed water part is composed of a nozzle, a nozzle cleaner, a water mixer, a feeding screw, a stirring roller and the like. When the material passes through the flow meter, the flow rate is measured, thereby controlling the amount of water added.
2. Polishing part The polishing part is the core part of the polished rice machine. It consists of a feeding spiral, a polishing roll, an octagonal screen cylinder composed of eight rice sieves, and a discharge pressure gate. The polishing roller is divided into iron roller and sand roller according to the material properties. It should be clear that the wire roller speed is higher than the iron roller linear velocity (the iron roller linear velocity is about 5m/s, the polishing pressure is higher, and the average value is 0.1MPa). The line speed of the sanding roller is about 15m/s, and the polishing pressure is low, and the average value is 0.02MPa).