Receiving of feed ingredients

The receipt of raw materials into the factory is the first process of feed production in the feed mill, and is also an important process to ensure the continuity of production and product quality. The raw material receiving task is to transport the various raw materials required by the feed mill to the factory with certain transportation equipment, and pass the quality inspection, weighing measurement, initial clearing into the stock or directly put into use. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

The raw material receiving capacity must meet the production needs of the feed mill, and adopt appropriate and advanced technology and equipment to receive raw materials in time, reduce the labor intensity of workers, save energy, reduce production costs and protect the environment. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

The feed capacity of the feed mill and the output of the finished product are very large, so the receiving capacity of the receiving equipment of the feed mill is generally 3 to 5 times that of the feed mill. In addition, there are many varieties of raw materials, large differences in quantity, and different packaging forms, which brings complexity to the receiving of raw materials. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

First, the land receiving of raw materials bNz China feed industry information network - based on feed, service animal husbandry

Bulk receiving process: Raw materials imported into the factory by bulk cars or trains are automatically unloaded into the grain pit after being weighed by the car's medium balance and train rails. Then, the raw materials are transported by the horizontal conveying equipment and the bucket elevator, and then cleaned, weighed and stored in the warehouse or directly into the warehouse to be pulverized or the batching bin. When the package is received, it is manually unpacked and poured into the receiving hopper and transported into the working tower. In order to ensure smooth production, it is necessary to ensure that the processing capacity of the downstream process equipment is greater than the principle of 10% to 15% of the previous process capability. In order to make the material into the primary cleaning screen evenly, to ensure the flow rate of the primary cleaning screen is stable, a buffer tank should be set before the primary cleaning screen. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

The car's dropping pit should be equipped with a fence, which can protect personal safety and remove large impurities. The grid gap is about 40mm. There are two forms of car grain pits, namely, deep pits and shallow pits. There are two different dust removal design methods due to the difference in pit depth. For large and deep pits, it has a better effect of vacuuming under the grid; while shallow pits have better suction effect on the grid. For the deep pit, when the material is dumped, the material will not be piled up to exceed the grid height, and the suction effect under the grid is good. The suction opening shall be installed in the pit where the material will not be sucked into the dust removal system. The installation of a fixed baffle creates an area in the discharge pit where the material cannot flow, reducing the possibility of drawing the material into the dust removal system. For deep pits, the amount of suction per square meter per minute is 45.72 M3 (150 cubic feet per minute). bNz China Feed Industry Information Network - based on feed, serving livestock

For shallow pits, the suction points should be chosen on both sides of the driveway, or in the case of auxiliary discharge pits, the suction points should be placed behind the grille. The vacuum hood should be placed as close as possible to the grille as far as it does not interfere with the passage of the vehicle. It is recommended that the system design absorb air at 283-425 cubic meters per minute. The design should consider the closed form, the distance of the dust cover from the grille, the area of ​​the grille and the unloading form of the vehicle to determine the optimum suction volume. The funnel discharge produces much less dust than the tipping bucket. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

Second, the raw material waterway reception bNz China feed industry information network - based on feed, service animal husbandry

There are criss-crossing water networks in the southern part of China, and there is a developed water transport system. Because of its low cost, it is the preferred form of transportation under conditions. The pneumatic transport receiving process is suitable for water transport and loading and unloading of grain. Its straw is a hose, which can adapt to the fluctuation of the water level. At the same time, the straw can move back and forth, not limited by the shape and size of the ship. It also ensures good sanitary conditions and the hull structure is not damaged. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

The pneumatic conveying device is composed of a suction nozzle, a material pipe, a discharge device, a wind shutoff device, a dust remover, a fan and the like. Under the action of the wind power of the fan, the suction device sucks the material from the ship into the unloader, and the separated material is discharged into the subsequent conveying device or storage bin by the airlocker. Pneumatic conveying devices can be divided into mobile and fixed types. Generally, large-scale feed mills should be fixed, and small plants can be mobile. The advantages of the pneumatic conveying device are that the suction material is clean, the dust is small, the structure is simple, the operation is convenient, the labor intensity is low, and the disadvantage is that the energy consumption is high. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

Third, the receipt of liquid raw materials bNz China feed industry information network - based on feed, service animal husbandry

The most liquid raw materials received by feed mills are molasses and oils. When liquid raw materials are received, they must first be inspected. The main contents of the test are color, odor, specific gravity, concentration, and the like. Raw materials that have passed the inspection can be stored in the warehouse. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

The molasses has an acidity of 5.5 or more, and is hardly corrosive to the steel sheet, but corrodes the tank wall when moisture condenses on the inner wall of the tank. A large-diameter snorkel should be placed at the top of the tank, and at least two vents with a diameter of 10.0 cm should be provided for the small-capacity storage tank. A groove should be provided at the bottom of the tank, and the suction pipe of the suction pump is placed on the groove to suck the molasses. The molasses injection tube should also extend close to the bottom of the tank to reduce air bubbles during injection. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

In cold areas, tank insulation must be done to heat the molasses to reduce viscosity and facilitate transport. When the molasses is heated to 48 ° C, the coking is started locally, so indirect heating must be carried out using warm water or reduced pressure to steam having a gauge pressure of less than 0.1 MPa. The delivery of molasses can be done with a screw pump. After the molasses tank enters the factory, it is sent to the storage tank by the pump arranged in the factory. The tank has a heating device, which is heated first and then sent to the workshop by the working pump. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

The storage tank for grease has two kinds of slant bottom and cone bottom. The inclined bottom and the conical bottom are mainly for concentrating the deposited sand and moisture so that they are discharged from the lowest outlet. The grease is absorbed by a tube slightly higher than the low surface to remove water. The grease outlet should be at least 15 cm above the inclined bottom tank, preferably 30 cm when possible; for cone bottom tanks it should be placed above the cone. The storage tank is generally provided with a heating coil. The heating tube arrangement of the inclined bottom tank is shown in Figure 1-6, the coil is 15 cm away from the bottom of the tank, the grease outlet is preferably 25 cm from the bottom, and the drain is at the lowest point. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

When the entrained moisture in the grease increases from 0.5% to 3%, the oxidation of the grease accelerates, the quality decreases, and the corrosive force on the tank wall increases. The storage tank is generally made of ordinary carbon steel and has a wall thickness of about 3 mm. bNz China Feed Industry Information Network - based on feed, serving animal husbandry

The grease receiving route is basically the same as molasses. After the grease is received, it is heated to 75-80 °C before use. If pumping is used, the heating speed can be increased to shorten the heating time by half. For tanks with a stirrer, the gap is agitated. The performance of the agitator is related to the volume of the tank. Regular work should be checked frequently, at least once every three months to prevent excessive deposits. In order to avoid the addition of oil to the mixture, a fat globule (powder ball) is formed. It is preferable to provide an exchanger near the mixer to heat the grease to keep it in the range of 60 to 90 ° C to reduce the viscosity of the grease. bNz China Feed Industry Information Network - based on feed, serving animal husbandry