3. Methods to improve the service life of rice hulling rubber rollers and precautions in use:

1. Reasonable selection of rubber rollers: black, brown, and white rollers with a Shore hardness of 90o, 95o should be selected reasonably. According to the specific conditions of the rice varieties, climatic conditions, seasons and other specific conditions in the region, a reasonable combination, preferably fast Choose a roller with higher hardness and a slow roller with a lower hardness. Avoid using a single type of rubber roller.

　　2. Control the working temperature: the actual working hardness of the rubber roller during rice milling is 78 o-82 o Shore. According to the measurement: the working temperature should be below 50℃ (when the working temperature is above 60℃, the hardness of the rubber roller will drop by 4-8 degrees).

　　3. Implement multiple rubber rollers alternately: this method can effectively increase the service life of the rubber rollers and the amount of rice milling. Its advantage is that each rubber roller has a working interval, which is beneficial to eliminate fatigue stress, restore rubber performance, facilitate the use of different diameters to adjust the linear speed difference, and 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 stipulated as one year, so as to plan to purchase appropriate storage, and to do a good job of storage. The specific storage requirements are as follows:

　　 (1) Avoid direct sunlight and rain and snow erosion, and be no less than 1.5 meters away from the heating device.

　　(2) It is forbidden to contact with substances that affect the quality of rubber, such as acids, alkalis, salts, oils, and organic solvents, and should be kept clean.

　　(3) The temperature of the storage warehouse should be kept between 10o and -30o, and the relative temperature should be between 50o and 80o.

　　(4) It should be rotated vertically, and other materials shall not be placed horizontally or piled up. No blows are allowed to avoid deformation and damage.

　　Four. Abnormal phenomena and causes of rubber rollers during use:

　　1, the rubber roller produces a large and small head;

　　 Reasons: 1 The weight of both ends is uneven;

　　2 Improper adjustment of rolling distance;

　　3 Uneven rice flow or deflection of the plate;

　　4 The axes of the two rollers are not parallel.

　　2. The middle of the rubber roller is convex or concave:

　　 Reason: 1 Concentration or uneven flow layer;

　　2 The dripping board is uneven;

　　3 The gate is worn or crescent-shaped;

　　4 The size of the rubber roller head, only pay attention to the big head.

　　3. The surface of the rubber roller is bad:

　　 Reasons: 1. The net grain contains hard impurities;

　　2 The line speed difference is too large, the rolling distance is too small or the pressure is too heavy;

　　3 The hulling machine shakes severely;

　　4 When the moisture content of the rice is too high or the hulling rate is low, only pay attention to adjusting the roller pitch and not the line speed difference.

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

　　 Reason: 1 Poor ventilation;

　　2 The line speed difference is too large, the pressure between rolls is too large, and the rolling distance is too small;

　　3 The roughness of the rice hull is too high;

　　4 Two rollers are in direct contact

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

　　 Reasons: 1. The rice is not flowing smoothly;

　　2 Line speed difference or improper selection of rolling distance;

　　3 The rubber roller is loose;

　　4 Static balance is inaccurate.

　　6. ​​The rubber roller wears out too fast:

　　 Reasons: 1 The difference in linear velocity between the two rollers is too large, and the hulling rate is too high;

　　2 The pressure between the rolls is too large and the rolling distance is too tight;

　　3 The rice contains impurities and high water content;

　　4 The working temperature of the rubber roller is too high;

　　5 The hardness of the rubber roller is too high.

　　7. Deformation of rubber roller:

　　 Reasons: 1 improper storage, partial aging or melting;

　　2 Inaccurate static balance correction, wrong counterweight position;

　　3 The working temperature of the rubber roller is too high

　　4 When it is difficult to hull the rice, the continuous working time is too long.

　　 8. Foaming and peeling of rubber roller:

　　 Reasons: 1 The quality of the rubber roller is good

　　2 Rubber roller is aging;

　　3 The direct friction time between the two rollers is too long;

　　9. The rubber roller cores, bursts, and collapses:

　　 Reasons: 1 The quality of the rubber roller is not good;

　　2 The storage time is too long.

　　10. Rubber roller edge:

　　 Reasons: 1 The length of the rubber roller is wrong;

　　2 The lengths of the two rollers are not aligned when they are installed.