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Methods for combining wheat cleaning processes

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The wheat cleaning process consists of four stages: raw material reception and initial cleaning,  wheat cleaning, moisture regulation, and smooth wheat cleaning.

Each stage is composed of the process equipment that undertakes the corresponding task according to a certain law. The sequence of the four stages in the process is as follows: raw material reception and initial cleaning, wheat cleaning, moisture conditioning, and smooth wheat cleaning.

When combining the wheat cleaning process, the above four stages can be combined separately and then connected in order in the process. The combination of ventilation and dust removal air nets is also an essential component of the wheat cleaning process portfolio.

In addition, in well-developed plants, the wheat cleaning process also includes foot treatment.

(1) Receipt and initial clearance of raw materials 

The raw materials sent by the receiving and transporting vehicles are sent to the storage warehouse after preliminary cleaning, and this process is called the receipt and initial cleaning of raw materials.

1. The form and characteristics of raw material receipt The form of raw material receipt is related to the conditions of plant type, factory address, transportation and packaging methods. From the reception of bulk and packaging raw materials, the raw materials unloaded from the means of transport are generally received by the discharge pit of a certain volume, and then the transfer is completed through the conveying equipment with corresponding conveying capacity. The raw material receiving process is characterized by large and unstable working flow and uneven equipment load.

2. Determination of receiving capacity. The size of the receiving capacity is related to the packaging method of raw materials and the means of transportation.  When the means of transport is a bulk dump truck, the receiving capacity should generally not be less than 50~100t/h; when the means of transport is a train or ship, the receiving capacity should generally not be less than 100t/h; if all the raw materials received are bagged, it is generally manual feeding, but the receiving capacity should generally not be less than 30t/h.

3. Process flow When receiving raw materials, raw materials should be measured.

There are two arrangements for the location of metering equipment:

First, the measuring equipment is placed before the initial Qing Dynasty, and the ground balance is generally used;

The second is to put the measuring equipment before the warehouse after the initial clearance, and generally use electronic automatic scales. The former can be more convenient to measure the receiving raw materials, but because the large impurities in the raw materials are not removed, the accuracy of the measurement will have a certain impact, and the latter has a higher measurement accuracy. 

In order to ensure the effect of initial cleaning, a primary cleaning screen is generally set up in the receiving process, and two can also be set up when conditions permit, and the first can be a cylinder primary cleaning screen.

The second course uses a vibrating screen.

Due to the influence of the working mode, it is not suitable to use the screening equipment of the plane rotary type for initial cleaning. Due to the large dust content of raw materials, sufficient ventilation and dust removal equipment should be configured.

The general process of receiving raw materials and initial cleaning is as follows: receiving raw materials → cylinder primary cleaning screen→ magnetic separation → (vibrating screen) → (intermediate silo → automatic weighing) → raw material storage bin.  Raw materials need to be sent to the storage warehouse according to the variety classification, and then the raw materials are selected and sent to the cleaning workshop for processing according to the requirements of processing. （

2) The process between wheat silo and the water equipment is called wheat cleaning.

1. The characteristics and tasks of wheat cleaning The wool wheat cleaning process configuration has many working links, through the wool wheat cleaning, the purity of the wheat should be close to the quality standard of the grinding wheat, so the process effect of the wool wheat cleaning has a greater impact on the whole cleaning process.

2. The general process of wheat cleaning is as follows: 

Workshop wheat bin (wheat blender) → (intermediate bin → automatic weighing) → (magnetic separation) → screening, winnowing→ stone → selection→ magnetic separation→ → screening, winnowing Workshop wool wheat bin by the raw material storage bin to provide raw materials, under the bin can be set up wheat mixer to meet the needs of collocation and flow control. 

Before the first impurity removal equipment, an automatic scale can be set up to detect and measure the flow rate of wool wheat. An intermediate bin should be set up in front of the scale, and the capacity of the intermediate bin is about 0.5h of processing capacity. 

The first impurity removal equipment for wool wheat cleaning is usually a screening equipment with winnowing, such as a vibrating screen or a plane rotary screen, to remove most of the large, small and light impurities to facilitate the operation of subsequent equipment. Magnetic separation equipment can also be added before the screening equipment. 

The first destoner is placed behind the first sieve and in front of the selector and the threshing machine. The purpose is to improve the use effect and service life of the selection machine and ensure the safety of the threshing machine on the premise of ensuring the stone removal effect. 

The sorting machine is generally placed behind the stone remover and in front of the threshing machine. Because the sand and gravel wear a large amount of bag holes of the sorting machine, the wheat and fine impurities crushed by the wheat threshing machine will not only affect the buckwheat removal effect of the sorting machine, but also make the selected small grains contain a large amount of broken wheat. Due to the uncertainty of the impurities in the raw materials, a bucket should be installed in front of the selector to select whether the wheat enters the selector for processing. 

The threshing machine for processing wheat should be lightly beaten, and the screening equipment with winnowing is often used behind the threshing machine, that is, the combination of sieving and sifting, so as to remove the impurities laid in time. At least one magnetic separation should be set before the threshing to ensure the safe operation of the threshing machine.

(3) Water regulation Water regulation is an indispensable process in the wheat cleaning process.

(4) The process of smooth wheat cleaning from the wheat silo to the 1B mill is called smooth wheat cleaning. 1. The task of smooth wheat cleaning The task of smooth wheat cleaning is to completely remove all kinds of impurities in the wheat and part of the wheat wool husk to reduce the ash content of the wheat, ensure the quality of the wheat, and improve the purity of the product. 2. The general process of wheat cleaning is as follows: Wheat silo (wheat dispenser) → stone removal → magnetic separation → wheat → screening, winnowing → (spraying water) → net wheat bin → (automatic scale) → magnetic separation → 1B grinding The second stone removal should generally be set at the first position of the smooth wheat cleaning.

The threshing of the light wheat should be heavy, and the screening equipment with winnowing should be set up after the threshing. Set up an automatic scale before grinding, can be more accurate to understand the flow of grinding, is conducive to production management, because there is a net wheat silo, so there is no need to set up an intermediate bin before the scale. Wheat can be sprayed with water before entering the clean wheat warehouse. A magnetic separation can be set before grinding to protect the mill.

• The combination of ventilation and dust removal air net in the wheat cleaning process Each equipment in the process should be sucked up, which can not only absorb light impurities, but also reduce the dust concentration of the air in the machine, maintain the negative pressure in the machine, and avoid dust overflow.  The suction and dust removal system can be used as a separate or combined air net. The stone remover has high requirements for the stability of the air volume, and generally adopts a separate wind net. Due to the different operation times of the three processes of raw material receiving and initial cleaning, wool wheat cleaning and smooth wheat cleaning, at least one set of combined air nets is used for each. If the air suction volume of the equipment is large, two groups can also be used when one set of air nets cannot meet the requirements.

(6) Foot treatment Large factories can use a process composed of small screening, stone removal and winnowing equipment to deal with the feet, and small and medium-sized factories generally use manual treatment. 

The whole wheat extracted from the lower leg can be sent back to the production hall. The selected impurities are mainly divided into two categories, one is industrial waste, such as the shoulder stone selected by the stone remover, the large inorganic impurities selected by various screening equipment, and the iron miscellaneous selected by the magnetic separation equipment, etc.;

Industrial waste must be properly disposed of, and all kinds of organic impurities with nutritional value are mainly used as feed.

Methods for combining wheat cleaning processes

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