Discussion the Roller Mill

For thousand years, in North of China, wheat flour is the main food.

we get the flour through stone roller.

It was also the prototype of a flour mill. Modern mills change the milling plate into lumps (called grinding rollers on the pulverizer).

So that the two lumps (grinding rollers) move towards each other to achieve the effect of crushing wheat.

So the working principle of the mill is: use a pair of rollers with speed difference and relative rotation to peel the wheat, peel the wheat endosperm from the husk, and grind it into flour.

The mill is one of the main pieces of equipment necessary for wheat processing.

Its development has also gone through several stages, manual, hydraulic, and pneumatic mills. Before the 1980s, manual and hydraulic pulverizers were commonly used in my country.

Manual mills are mostly used for complete sets of units below 50 tons, and hydraulic mills are mostly used for flour mills above 60 tons. The disadvantage of hydraulic mills is that they leak oil and are difficult to handle. In the late 1980s, with the gradual improvement of the quality of my country's pneumatic components, pneumatic mills gradually entered the market and replaced hydraulic mills. For small flour mills, manual flour mills are still in use.

Mill structure

At present, the mills on the market are of duplex structure, that is, the whole machine is composed of two independent parts, each part is mainly composed of two grinding rollers (grinding system), two feeding rollers (feeding system), and some auxiliary mechanisms. (Transmission part) composition.

(1) Feeding part: the wheat or other wheat products in the milling process that have been crushed enter the first part of the wheat mill, which is called the observation tube or feed box. This part is generally made of transparent material. It is convenient to observe the flow of materials, and it is convenient for the operator to adjust the mill according to the level of the material. The feed box is intuitive in that the material enters the wheat mill Of a box structure.

(2) Feeding system (or sizing part): It is under the feeding box and on the upper part of the grinding roller, and is generally composed of two cylindrical roller bodies. According to the different technological positions of each wheat mill in the whole milling process, different speeds and speed ratios are designed to make the distribution of materials more even before entering the grinding rollers to achieve the thickness of the materials entering between the grinding rollers Uniformity, so as to ensure a consistent grinding effect.

(3) Grinding system refers to the grinding roller and some auxiliary parts, such as grinding roller cleaning system, grinding roller baffle, etc. The processing quality of the grinding roller itself directly affects the flour quality and output.

(4) Transmission part: Everyone knows that the speed of the grinding roller on the outside of the mill is higher than that on the inside, so it is customary to call the two grinding rollers on the outside of the wheat mill as fast rollers and the two inside as slow rollers; between the two grinding rollers To ensure a certain speed ratio, there must be a set of the transmission mechanism between the grinding rollers (including fast and slow roller pulleys, toothed wedge belts, etc.) to meet this requirement; there is also a feeding roller transmission, and the traditional air-pressure wheat mill is composed of The fast roller or the slow roller is driven by a transmission belt.

Pulverizer process parameters

Flour processing is a continuous production process, and wheat flour mills occupy an important position in the entire production line. According to the needs of the milling process, the mill is divided into four grinding systems: skin mill (B), core mill (M), slag mill (S), and tail mill (T).

The process configuration of the wheat mill for each grinding system is different.

①The process parameters of the surface of the feeding roller are different;

②The position of the feeding door is different;

③The shape parameters of the surface of the grinding roller are different;

④The gap of the grinding roller is different when the wheat flour mill is working, that is, the rolling distance is different. The rolling distance is the minimum distance between the surfaces of the two grinding rollers;

⑤The grinding roller speed is different;

⑥The grinding roller speed ratio is different;

⑦The feeding roller speed is different;

⑧The feeding roller speed ratio is also different. These parameters related to the process position are basically guaranteed by mechanical mechanism design or mechanical part design.

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