1. Raw material receiving : It is the process of putting all kinds of raw materials required by the feed mill into the stock through direct processing or directly into use. Generally it is 3-5 times of the production capacity of the feed mill.
Second, the general procedure for receiving raw materials : raw material transportation - quality inspection - weighing and weighing - cleaning - metering - storage.
Third, the raw material receiving equipment mainly includes:
1, measurement scale,
The medium balance, the electromechanical combination of the middle balance, the electronic ground balance, the mechanical platform scale, the electronic platform.
2, the feed pit,
Also known as the lower pit, the pit, the raw material enters the raw material receiving or processing program through the dropping pit. There is often a ventilation and dust removal system, and the lower angle is not less than 60 degrees.
3, conveying equipment,
4, cleaning equipment,
There are three main types, grid screen, magnetic separation, cleaning screen
5. Raw material storage. Usually steel structure, carbon steel structure or concrete structure, small footprint, high degree of mechanization, can guarantee the quality of materials.
Fourth, the raw material receiving process
1. Bulk receiving process: The raw materials of bulk trains or bulk trucks are automatically discharged to the blanking pit after being weighed by the car and the railway track. The bag is filled by manual feeding or machine feeding.
2, the raw material of the waterway to receive
The pneumatic conveying device is composed of a suction nozzle, a material pipe, a discharge device, a fan, a dust collector fan and the like. Divided into mobile and fixed type, the advantages are less dust, clean suction, simple structure, convenient operation, and high energy consumption.
3, the receipt of liquid raw materials
The liquid raw materials are inspected before being received, and then passed to the storage tank after passing the test. Storage tanks generally have two types of inclined bottoms and tapered bottoms.
Fifth, the cleaning of raw materials
The purpose of cleaning: remove the impurities such as sand, dander, straw, iron and other impurities in the grain, ensure the safe production of processing equipment, reduce equipment loss and improve the production environment.
Commonly used cleaning equipments include: grid screens, cleaning screens, and magnetic separation equipment.
1. Grid screen: set in the first process, the gap between corn is generally 30mm, and the oil platinum cake is 40mm.
2, the first clear sieve: mesh belt type clear sieve, cylinder clear sieve, punching cone primary clear sieve, vibration primary clear sieve.
3, the principle of screening; is based on the particle shape, width, thickness and other aspects of the material particles. Part of them through the sieve surface into a sieve under the sieve, separated from impurities,
Sixth, magnetic separation equipment
1. Magnetic separation meaning: Effectively prevent metal impurities mixed in the main and auxiliary raw materials from entering the next process, causing mechanical loss and damage.
2, the principle of magnetic separation: the use of feed materials and magnetic separation of metal impurities in the difference in magnetic susceptibility to remove magnetic metal impurities.
3. Common magnetic separation equipment: è“–-type magnetic separator, flow tube magnetic separation equipment, permanent magnetic cylinder magnetic separator, permanent magnetic drum magnetic separator, and primary magnetic separator.
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