News dynamics

Home page

全部分类

Chapter IV Proper Use of Husking Cots

Release time:

2019-12-10

1. rice rubber shell process conditions:

The process of grain shelling generally goes through three basic steps: squeezing, rubbing and tearing, and peeling. Among them, rubbing and tearing is the key to shelling. The size of rubbing and tearing depends on two important factors: one is the size of friction, and the size of friction depends on the size of the pressure between the two rollers; The second is the length of the relative action time of this reverse friction on the grain, the length of this action depends on the relative speed of the two rollers, that is, the line speed difference. It is not difficult to see: the pressure between the rollers and the line speed difference is an important process parameter of rice shelling, the choice of its correct or not not only directly affect the shelling rate, but also affect the consumption of rubber rollers.

General principles for 2. selection of process parameters:

The amount of rice grinding of rubber rollers is actually a comprehensive reflection of the shelling rate and the amount of glue consumption, which interact and restrict each other, the so-called best process state refers to both a higher shelling rate and a lower amount of glue consumption, which is the general principle of selecting the process parameters.

　　1. Selection of line speed difference:If the line speed difference is too large, it can enhance the tearing force and improve the shelling rate, but it also increases the wear and power consumption of the rubber roller. The line speed difference is too small, the shelling rate is low, the shelling rate is small, the shelling grain increases, and the total amount of rice grinding is not high. It can be seen that the selection of line speed difference must take into account both the shelling rate and the rubber consumption. It is wrong to pursue any one index unilaterally. According to our company's many years of experience, it is better to choose 2,43 meters per second for the line speed difference. When the line speed difference is less than 2 meters, the shelling rate decreases significantly (the speed of the fast roller of the husker is 1350 revolutions, minutes, and the speed of the slow roller is 1150 revolutions, minutes; The speed ratio is 1:1.17). The rubber roller of the husker is constantly wearing when it is working, and its line speed difference is always shrinking, in order to ensure a certain process effect, it is necessary to maintain a certain line speed difference. When the diameter of the fast roller is smaller than the diameter of the slow roller, the fast roller will be replaced immediately. Generally, the diameter of the fast roller should be larger than that of the dry slow roller. In actual work, the selection basis and factors of the line speed difference are various, such as the variety of rice, the thickness of the husk, the tightness, the moisture content and climatic conditions.

　　2. Selection of pressure between rollers:The pressure between rollers is also one of the key process parameters for the tearing force. On the roller husker, the pressure between rollers is adjusted by the weight of the lump. In principle, it is easy to be light and not easy to be heavy. Both sides are balanced, and the lump weight can be appropriately increased as the rubber roller gradually wears. For the manual roller husker, the width of the distance between rollers is appropriate to be equal to the thickness of rice grains, generally 0.5 (indica rice) 0.8 (japonica) mm, should adhere to the principle of frequent tight less into, parallel feed.

3. the method of improving the service life of the valley knee roller and the precautions in the chain:

　　1. Reasonable selection of rubber roller:For black, brown, white, Shore hardness 90.,95 off-rolls should be reasonably selected, and should be reasonably matched according to the specific conditions of rice varieties, climatic conditions, seasons and so on in the region. It is better to choose fast rolls with higher hardness, slow rolls with lower hardness, and avoid using single-variety rubber rolls.

　　2. Control working temperature:The actual working hardness of rubber rollers in rice grinding is Shore 82. -86. According to the measurement: the working temperature is below 50 ℃ is appropriate (when the working temperature is above 60 ℃, the hardness of the rubber roller decreases by 4-8 degrees).

　　3. When only rubber rollers are used alternately:This method can effectively improve the service life of rubber rollers and the amount of rice grinding. Its advantage is that each rubber roller has a working interval, which is beneficial to eliminate fatigue stress, restore the performance of rubber materials, facilitate the use of different diameter adjustment line speed difference, and can effectively control the working temperature.

　4. Strengthen the storage of rubber rollers:Do a good job of anti-aging. The effective storage period of rubber rollers is one year, so as to plan to purchase appropriate reserves and carefully do a good job of storage. The specific storage requirements are as follows:

(1) Avoid direct sunlight and rain and snow erosion, and the distance from the heating device is not less than 15 meters.

(2) Prohibit contact with acids, alkalis, salts, oils and organic solvents that affect the quality of rubber, and keep them clean.

(3) The temperature of the storage warehouse is kept between 10-300, and the relative temperature is between 50-80.

(4) It shall be rotated vertically and shall not be placed horizontally or stacked with other substances. Do not strike to avoid deformation and damage.

4. axillary roller in the course of the use of the berry normal phenomenon and causes:

1. Rubber rolling produces size head:

Reasons: 1. The weight of the lump at both ends is uneven; 2. Improper adjustment of rolling distance;

3. The rice flow is uneven or the elimination plate is skewed; 4. The axes of the two rollers are not parallel.

2. Leap convex or middle concave in rubber roller:

Reasons: 1. The flow layer is concentrated or uneven; 2. The elimination plate is uneven;

3, the gate wear or crescent shape; 4, roller size head, only pay attention to the big head;

3. The surface of the rubber roller is bad:

Reason: 1, net grain containing hard impurities; 2, line speed difference is too large,

3. The husking machine vibrates seriously. 4. When the moisture content of rice is too high or the shelling rate is low, only pay attention to the adjustment, and the roller distance does not pay attention to the adjustment of the linear speed difference.

4. The working temperature of rubber roller is too high:

Reasons: 1. Poor ventilation; 2. The line speed difference is too large, the rolling pressure is too large, and the rolling distance is too small;

3. The backhulling grain is too rough; 4. The two rollers are in direct contact.

5. Vertical and horizontal lines on the surface of the rubber roller:

Reasons: 1. Poor rice flow; 2. Improper selection of line speed difference or rolling distance;

3. The rubber roller is loose; 4. The static balance is not allowed.

6. The rubber roller wears too fast:

Reasons: 1, two roller line speed difference is too large, shelling rate is too high; 2, the pressure between the rolls is too large, rolling distance is too tight;

3, rice containing impurities and moisture is too high; 4, the working temperature of the rubber roller is too high;

5. The hardness of rubber roller is too high.

7. Deformation of rubber roller:

Reasons: 1. Improper placement during storage, local aging or melting; 2. Inaccurate static balance correction and incorrect counterweight position;

3. The working temperature of the rubber roller is too high; 4. When the rice shelling is difficult, the continuous working time is too long.

8. Foaming and peeling of rubber roller:

Reasons: 1. Poor quality of rubber rollers; 2. Aging of rubber rollers;

3. The direct friction time of the two rollers is too long:

9. Decoring of rubber roller, bursting and cavity collapse:

Reasons: 1. The quality of rubber rollers is not good; 2. The storage time is too long.

10. Edge lifting of rubber roller:

Reasons: 1. The length of the rubber roller itself is not right; 2. The length of the two rollers is not aligned when they are installed.