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Milling machine type and principle of introduction
- Dec 18, 2017 -

Milling machine type and principle of introduction



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1 rice milling machine type and rice milling principle

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At present, rice milling industry in China uses a wide variety of rice milling machines, rice milling machine is the main working part roller. According to the type of roller can be divided into sand roller rice mill and iron roller rice mill; according to its roller device form is divided into vertical rice mill and horizontal rice mill; Jet rice mill, humidifier and rice and so on.

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1.1 Sand Roll Rice Mill Roller made of emery rice mill called sand roller rice mill sand roller rice milling process is: Brown rice in the white room, with high-speed movement, hard and sharp dense diamond Grit blade to remove the grain of rice skin. Grinding white grinding effect depends on the following two factors:

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First, there is a certain grinding force, enough to destroy the structure of rice bran; the second is to provide more and more grinding opportunities. For this reason, the emery roll should have a larger wire speed, and at the same time make the rice grain have enough tumbling opportunity. Sand roller rice machine has vertical and horizontal points, according to foreign information, vertical sand roller rice machine machine pressure is smaller, the rice grain in the grinding chamber is basically a kind of suspension state, grinding white effect is to rely on rotation Of the sand roller through the rice lightly finished, and thus less damage to the white rice milling process, vertical sand roller rice mill is suitable for grinding rice grain strength is poor, the structure is more crisp, dry and hard surface varieties .

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1.2 iron roller rice mill Roller rice mill for the iron roll rice machine. Iron rice milling process is: brown rice in the rice machine, through the rice and rice milling machine parts and the relative movement between rice and rice friction, the role of deep inside the rice cortex so that the grain along the endosperm Of the surface of the relative slip, and was stretched, broken until separated from the endosperm.

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This rice mill larger pressure, the local pressure is often more than the compressive strength of rice, rice milling process is easy to produce broken rice, power consumption. Iron roll rice machine is suitable for processing structural strength of japonica rice.

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1.3 Vertical Milling Machine Vertical Milling Machine is called Vertical Milling Machine. The advantages and disadvantages of vertical rice milling machine:

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1.3.1 advantages. Gravity on the centrifugal acceleration of rice has no effect, uniform grain speed, white room pressure uniform. On the feed, the impetus for gravity in the entire length of the mill white chamber, rice flow more uniform.

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The number of knives, soft material, easy to adjust, rice tumbling good, small grain damage? Grinding white roller grinding wheel string together, when the local wear or replacement can be adjusted to use to improve the service life of the roller. Bran shed down smoothly. Broken rice rate is low.

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1.3.2 Disadvantages.

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Keep running smoothly demanding. Milling machine in the manufacture and installation, we must maintain the vertical axis of the roller mill, a slight error, even if completely balanced white roller, the center of gravity will be offset by the vertical line unbalanced force.

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Bearings are bi-directional in both axial and radial direction, requiring high performance, manufacturing and assembly of bearings.

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Unit volume of production, heavy machine. The use of gravity for axial propulsion is limited, the axial velocity of the flow meter is small, and in the case of the same incoming machine as the horizontal rice milling machine, the roller diameter must be enlarged to increase the cross-sectional area of the grinding chamber, Machine size and weight with the increase.

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Disassembly sand roller inconvenient, time-consuming and laborious.

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Soft knife wear faster, more, maintenance costs increase.

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It is more difficult for two grinding white rolls to be coaxially or axially coupled on a rice milling machine.

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1.4 horizontal rice mill horizontal spindle placed rice mill called horizontal rice milling machine. Horizontal rice mills are divided into single-roll rice mills, double-roll rice mills and Miehui combination of rice milling and so on. The advantages and disadvantages of horizontal rice machine is:

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1.4.1 advantages.

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Smooth operation. Bearings only by radial force, unbalanced bearing stress and torque generated by the smaller machine. Roller mounted horizontal roller manufacturing, assembly of the less demanding, the corresponding structural components of the technical requirements are not high.

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Unit volume and weight less. Due to the large axial thrust, the rice grain speed is larger. Under the same incoming material flow rate as the vertical rice milling machine, the diameter of the grinding roller and the annular area of the grinding chamber are smaller, and the whole machine is smaller in volume and weight Light, combined with high manufacturing technology, low cost.

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In the horizontal plane whiteboard dismantling sand roller convenient, time-saving and labor-saving.

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Two grinding white roller in a rice milling machine coaxial or isosceles combination are convenient and reasonable.

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1.4.2 Disadvantages.

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Gravity affects the centrifuge acceleration of rice grains, making a difference in the upper part and the lower part of the grinding chamber, affecting the homogeneity of grinding degree.

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The number of knives, material hard, and some not easy to adjust, such as in the lower part of the fixed knife to be shut down to adjust, although the steel knives wear but easy to damage the rice, increasing the rate of broken rice.

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Bran is easy to pile up in the white room.

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Spiral groove wear after artificial repair chisel, repair quality varies from person to person, sand roller for 2 to 3 sections of string fight, can not intermodulate or local replacement after wear, high maintenance costs.

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1.5 Spray Milling Machine Spray Milling refers to the jet milling machine in the milling of rice continue to spray white room air method, the wind under a certain pressure from the white roller inside the surface to the hole or groove spray Out The role of jet has 3 aspects:

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Cooling and dehumidification, the heat generated during rice milling and large amounts of water vapor emitted, not to increase the rice temperature, thereby improving and improving the rice milling process; increase the rolling rice, when the air into the white room, the volume expansion, pressure Reduce the formation of air flow, the formation of rice grains in the vortex turbulence movement, so that the rice grind evenly, to avoid over-grinding phenomenon; rice bran can be quickly discharged outside the machine to reduce the load machine, power consumption reduced. The use of multi-machine spray light water grinding process is to improve the rate of rice to reduce the effective way of broken rice is feasible and effective method of processing high-precision rice 1.6 humidifier Milling wet rice is developed on the basis of spray-milled rice The new method, that is, in the rice milling process, continue to spray white mist indoor air mist flow. The working principle is: sprayed into the white room is a high-speed high-pressure water mist flow, forming a lot of strong gas vortex around the roller movement, so that the rice in the rotation forward constantly humidified, flip and was peeling. Moisturizing rice bran on the one hand with the lower binding force on the one hand, on the other hand so that the friction coefficient between the grain surface with each other to increase the pressure required to crush reduced crushing rate decreases, the rice rate increase.

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2 rice machine choice

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Milling machine choice depends on the raw brown rice varieties and finished product quality requirements. Generally processing hard japonica rice, optional iron roll rice machine, processing soft indica rice should be used sand roller rice machine, the best choice of vertical sand roller rice machine. In the multi-machine grind white, sand roller used for grinding head Road, the last Road with iron roller rice mill, that is rough sand roller, roller fine grinding.

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3 reasonable rice milling process

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Milling section of the main impact is the combination of rice milling form. The combination of rice milling process directly affect the output rate and finished product quality. According to practical experience, the processing of high-precision rice is generally at least three machines out of white, the front road sand blasting machines available rice machine, if the indica rice, it is best to use 1 to 2 vertical rice machine rough, two available sand roller or Roller rice millet machine light grinding, three need to use iron roller rice machine lightly grind. Spray the water meters must meet the requirements of spray ventilation, otherwise it will cause the rice bran is difficult to wear sieve; rice can not be fluidized ground white; Mi temperature is difficult to reduce; easy to produce burst waist; hopper knot, loss of moisture accumulate equipment and produce corruption And so on.

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4 rice machine operation

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In the rice milling process on the quality of finished rice, in addition to rice milling machine performance and rice milling process, the correct operation of rice milling machine is also one of the important factors. Milling machine operator to rice machine to do / four understand, three will, Miyoshi 0 that understand the structure, understand the performance, understand the principle, understand the use; will operate, will maintain, will eliminate the fault; , Fix it.

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Milling machine operation, the key is to control the flow, grinding white room pressure, suction, the proportion of the row of bran.

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4.1 Milling machine flow Grind white room gap and roller speed conditions, the appropriate increase of rice machine flow, can increase the liquid density of rice grain, improve the grinding effect. However, the flow is too large, not only increase broken rice, white uneven mill, but also cause rice machine jam. On the other hand, if the flow rate is too small, the density of the rice liquid will decrease and the pressure of the white room will decrease. This will not only reduce the grinding effect but also increase the impact of the rice grains in the whitened room, resulting in an increase of broken rice.

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4.2 Grind white indoor pressure Grind white indoor pressure to adjust the outlet pressure 砣 position, when the pressure 砣 torque increases, the white mill indoor discharge resistance increases, grinding white room pressure increases, grinding white effect is strengthened. The actual operation should be based on the accuracy of finished rice to be adjusted.

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4.3 Milling machine air volume operation to ensure adequate and stable air volume, the rice bran produced by milling machine and a large number of hot and humid air through the sieve to leave the white room to ensure good grinding effect, but the amount of suction can not Too large, or brown rice in the horizontal rice mill easy to sink at the bottom of the rice sieve, resulting in grinding uneven white, broken rice increased. For the spray rice machine, the amount of spray volume on the jet milling machine has a direct effect on the process, air volume and wind speed is too large, not only uneconomical, but also lead to vicious impact, and even cause poor feed and export jet bran. Wind and wind speed is too small, it is not conducive to rice tumbling, reducing the role of row bran cooling. The proper amount of air jet allows the air flow to have enough force to form / liquefy the rice grains in the white room. This allows the cold air sprayed through to penetrate the material layer and carry away the bran powder and heat.