rubber roller for Rice Huller Machine

Specifications

:: Rice Roller & Polisher :: Specifications

Salient features to get maximum output from Rubber Dehusking Rolls. The life of rolls is not only governed by its quality but also several other factors such as variety and type of paddy (Short/Long, Raw/Parboiled), climatic conditions, Peripherals speed of Rolls distribution of paddy, moisture contents of paddy, dehusking percentage of paddy, clearance between the rolls cleaness of the paddy, cooling arrangement of rolls, eccentricity in shaft and operators skill. Some of these parameters e.g. Variety of paddy and climatic conditions are beyond the control of Rice millers but others can be controlled very well for which, following steps must be taken into account to get maximum output for rubber rills.

PERIPHERAL SPEED OF ROLLS

The Rolls rotate at different RPMS and in opposite direction. Normally the peripheral speed of the adjustable roll is about 25% slower than the fixed roll. Hence the former wears slower comparatively even as the rolls are interchangeable in position (Fig A). From above illustrations, it is clear that the pair of rolls must be changed at a time rather that the individual roll.

AGE OF ROLLS

Rubber rolls deteroiates gradually as shown in Fig. B below, hence they can be stored only for limited period and yet it is recommended that they should be utilized between 3 and 6 months after production. Therefore, rice millers should not store rubber rolls more than one year, rather a continuous supply should be maintained in order to receive optimum efficiency.

VARIETY OF PADDY

The size and roughness of husk affect the performance of the rolls when long grain varieties of paddy are dehusked by the contact area of the grain with the rubber is much longer compared to short grain varieties consequently, the wear is higher and the life of the roll is considerably reduced. The same quality of roll can dehusk about 200mt of short variety of paddy grown in Japan against only about 100mt of long grain paddy variety in tropical countries. When parboiled paddy is milled the husk gets loosened and thus spilt easily. Therefore same quality of rolls can dehusk about 300mt of parboiled paddy against only 200mt of raw paddy.

Quite often the grain distribution device does not function correctly and the roll surface wears out unevenly. Therefore, the Roll surface is corrected by removing the rubber from the sides of the roll. To obtain optimum life of the Roll and efficient dehusking performance. The Grain should be evenly distributed.

PRECAUTION FOR OPERATORS

1. At the time of installation of new rubber roll on the mendal, screw should be tight.
2. At the time of installation sleeve rubber roll it must be checked that the holes for nut and bolt should be of proper size and round in shape rather than elliptical to avoid vibrations.
3. The perforated Jali used for manufacturing rubber dehusking roll should be of proper size otherwise it may be distorted at the time of installation of rubber roll on mendal of the machine.
4. Don't use hammer on rubber rolls inner bore while fitting it on the mendal.
5. Set right the roll on mendal in quite straight in position as shown in the Figure. Please check both the keys of the roll. They should be in the center of the grooves of the mendal at the time of switching on the machine for applying pressure.
6. Paddy must be cool, clean and sound having fair average specifications.
7. Moisture contents of paddy to be dehusked should not be more than 14% to 15% i.e. it must be dried upto the safe level.
8. Paddy should not be damaged or partially damaged.

Rubber Roller Character:

1. Hardness is 90 ~95 degrees;
2. Excellent in heat and abrasion resistance;
3. Offering very strong bonding between rubber and drum;
4. High shelling efficiency up to 95%;
5. The SBR and NBR rice huller rubber roller can be options.
6. Elastic stiffness, Strong plasticity under the high hardness, moderate grain force, high roughness, low cardamine.
7. Good wear resistance, long using period. trong temperature, no climate impact, not deformation, soft, anti-tear at high-speed.
8. Health and non-toxic, no pollution to rice and bran, clean, bright white grain of rice, pure color quality.

Products technical indicators:

• Tensile strength: Mpa/2mm 25.2-26 (standard level: Mpa≥19)
• Wear reduction cm³/1.61km: 0.02-0.05 (standard level: ≤0.5)
• Break elongation: 320-360% (standard level: ≥200)
• Shore Hardness: 92°~98° (standard level: 85°~90°~95°)

Usage:

• Rice hulling rubber is the main part of rice huller machine, because of speed difference of veer and reversion between two rubber rollers, paddy are torn up by two rubber rollers, in the end, rice grains come out.
• NBR roller is the 2nd generation of rice huller rubber roller, is adopted 100% NBR rubber materials, the original color is Amber with innocuity, and its outputs will be two or three times more than SBR roller at least.
• Aluminum drum rubber roller, with its light weight, high concentricity, the wear-resisting performance is good. It makes the machine to reduce the load vibration, and to increase the rubber roller's life.
• We are pleasure to offer the main styles of hulling rubber rollers in our company. Our enterprise also can design special product according to your individual requirement.

Attentions:

1. Handle carefully during the transportation.
2. Store in dry place, away from Acid, Alkali, Salt, oil, and dirty, forbidden to put under sun for long time.
3. Take sands away from the paddy; keep paddy dry and cleaning when using the rollers.
4. Two rollers should be at the same lever, the space must be equal.
5. The paddy inputting should be keeping the balance.
6. keep the rate of the re-hulling under the limited
7. Don’t make the machine work for a long time, in case effect the hulling capacity.
8. The surrounding temperature is better under the 50°C.
9. Change the fast and slow roller at a certain time.