The feed mill mainly has three types of a roll mill, a hammer type feed mill and a claw type feed mill.
1. Pair roller mill. It is a kind of machine for sawing and grinding feed by using a pair of relatively rotating cylindrical grinding rolls. It has the advantages of high productivity, low power and convenient adjustment, and is mostly used in the wheat flour industry. In the feed processing industry, it is generally used in the secondary crushing operation. 2. Hammer-type feed mill. It is a machine that uses a high-speed rotating hammer to crush the feed. It has the characteristics of simple structure, versatility, high productivity and safe use.
3. Claw type feed mill . It is a kind of machine that uses high-speed rotating claws to crush feed. It has the advantages of small volume, light weight, fine product size and high working speed.
When purchasing, the model should be selected according to the number of work items, and then the specific product should be selected according to the manufacturing quality, sales price, and spare parts supply. When selecting, first check the appearance, check the attachments, instructions, and certificates after the Zui. At the same time, pay attention to the following aspects:
(1) When selecting the type, first consider which kind of raw material is pulverized by the pulverizer purchased. For crushing grain feeds, hammer mills with top feed can be selected; smashed bran grain wheat feeds are mainly used, and claw mills can be selected; if versatility is required, such as crushing cereals, Both the cake valley and the straw can be selected, and the tangential feed hammer mill can be selected; the mineral feed such as shells can be crushed, and the shell-free sieve mill can be selected; if used as a pre-mix feed, the particle size of the product is required to be crushed. Fine and can be adjusted according to the needs, should use special non-screen crusher.
(2) The specifications and the nameplate of the general pulverizer carry the rated production capacity (kg/h) of the pulverizer. However, it should be noted that: (1) The rated production capacity is generally based on the crushed corn, and the water content is based on the production of safe water (about 13%) and 1.2mm aperture sieve. Since corn is a commonly used grain feed, a sieve having a diameter of 1.2 mm is a commonly used small sieve hole, and the production capacity is small at this time, which takes into consideration the more common and difficult state in production. (2) The production capacity of the selected pulverizer is slightly larger than the actual required production capacity, and the continuous production and supply of feed will not be affected when the production capacity of the pulverizer is reduced due to wear of the hammer and air leakage.
(3) The energy consumption of the pulverizer is very large. When purchasing, it is necessary to consider energy conservation. According to the standards of the relevant departments, the hammer mill will not produce less than 48 kg per kWh when crushing the sieve with 1.2 mm mesh. At present, the power output of the domestic hammer mill has greatly exceeded the above regulations, and the high quality has reached 70 to 75 kg / kWh.
(4) The matching power of the pulverizer. Both the machine manual and the nameplate carry the kilowatts of power of the motor of the shredder. It often indicates not a fixed number but a certain range. For example, 9FQ-420 type pulverizer, supporting power is 7.5~11kW; 9FQ-60 type pulverizer, supporting power is 30~40kW. There are two reasons for this. First, there is a big difference in the power required when the pulverized raw materials are different. For example, under the same working conditions, the pulverized sorghum is twice as powerful as the pulverized corn. Second, when switching to different sieve holes, the load of the pulverizer has a great influence. Some people think that when the 9FQ-60 pulverizer uses a sieve with a 1.2mm mesh, the motor capacity should be 40kW. When using a 2mm mesh sieve, a 30kW motor can be used, and a 3mm mesh hole is a 22kW motor. Otherwise it will cause some waste. The hammer mill can be calculated using the empirical formula 1V = 6.4 to 10.5 Q (kW). In the formula: 1V - supporting power (Kw); Q - rated productivity of the crusher (t / h); 6.4 ~ 10.5 is the coefficient, coarse pulverization takes a small value, fine pulverization takes a large value.
(5) The method of discharging the pulverizer should be considered. There are three ways to pulverize the finished product through the discharge device: self-weight blanking, vacuum suction and mechanical conveying. Small single machines use self-weighting to reduce the structure. Most of the medium-sized pulverizers are equipped with a negative pressure suction device. The advantage is that the moisture of the finished product can be absorbed, the humidity in the finished product is reduced, the storage efficiency is improved, the pulverization efficiency is increased by 10% to 15%, and the dusting degree of the pulverization chamber is lowered. The mechanism is mostly used for pulverizers with a desktop output of more than 2.5t.
(6) Dust and noise of the pulverizer. The dust and noise in feed processing are mainly from the pulverizer. These two sanitation indicators should be fully considered in the selection. If you have to use the noise and dust high crusher, you should take noise reduction and dust-proof measures to improve the working environment and help the operator's health.
At the same time, you must take care of the following aspects when purchasing:
(1) According to the pulverized raw material selection, the pulverized grain feed is mainly used, and the hammer pulverizer with top feed can be selected; the crusher glutinous wheat wheat feed is mainly used, and the claw pulverizer can be selected; if versatility is required Good, mainly crushed grain, and take into account the cake valley and straw, you can choose the tangential feed hammer mill; crush minerals such as shells, you can choose shellless sieve crusher; if used as premix feed For the treatment, the particle size of the product is required to be fine and can be adjusted according to the needs. A special non-screen crusher should be used.
(2) According to the production capacity, the specification and nameplate of the general pulverizer are loaded with the rated production capacity (kg/hr) of the pulverizer. However, it should be noted that: (1) The rated production capacity contained in the specified state refers to the output under certain conditions. For example, the grain type feed mill means that the pulverized raw material is corn, the water content is storage safe moisture (about 13%), and the sieve aperture diameter is 1.2 mm. Since corn is a commonly used grain feed, a sieve having a diameter of 1.2 mm is a commonly used small sieve hole, and the production capacity is small at this time, which takes into consideration the more common and difficult state in production. (2) The production capacity of the selected crusher should be slightly larger than the actual required production capacity. Otherwise, the hammer wear and air leakage will increase the production capacity, which will affect the continuous production and supply of feed.
(3) According to the matching power, the machine manual and the nameplate are loaded with the power kilowatts of the motor of the crusher. It often indicates not a fixed number but a certain range. For example, the 9FQ-20 type pulverizer has a supporting power of 7.5-11 kW; the 9FQ-60 pulverizer has a supporting power of 30-40 kW. There are two reasons for this. First, there is a big difference in the power required when the pulverized raw materials are different. For example, under the same working conditions, the smashing sorghum is twice as powerful as the pulverized corn. Second, when switching to different sieve holes, the load of the pulverizer has a great influence. Therefore, when the 9FQ-60 type pulverizer uses a sieve with a diameter of 1.2 mm, the motor capacity should be 40 kW; when changing the sieve with a diameter of 2 mm, a 30 kW motor can be used, and a diameter of 3 mm can be used. It is a 22 kW motor, otherwise it will cause some waste.
(4) According to the discharge method, there are three ways to select the crushed product through the discharge device: self-weight blanking, vacuum suction and mechanical conveying. Small single machines use self-weighting to reduce the structure. The medium-sized pulverizer mostly has a vacuum suction device. The advantage is that it can absorb the moisture of the finished product, reduce the humidity in the finished product and facilitate storage, improve the pulverization efficiency by 10-15%, and reduce the dusting degree of the pulverization chamber.
(5) According to dust and noise, the dust and noise in feed processing mainly come from the crusher. These two sanitation indicators should be fully considered in the selection. If you have to choose a pulverizer with high noise and dust, you should take noise reduction and dust-proof measures to improve the working environment and help the health of the operators.
(6) According to the energy-saving situation, according to the standard regulations of the relevant departments, the hammer-type pulverizer should not produce less than 48 kg per kWh when smashing the sieve with a diameter of 1.2 mm. At present, the output per kilowatt hour of the domestic hammer mill has greatly exceeded the above regulations, and the high quality has reached 70-75 kilograms per kilowatt hour.
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