Category: rice polisher
By ricepolisher, 2018-06-19
There is large need of rice polisher with optimised power consumption. Polishing any material is basically a phenomenon of wear. Wear is defined as either mass or volume of material, removed or displaced from a solid surface, which is repeatedly subjected to mechanical stresses by rubbing with another solid surface or surfaces. This involves removal of material from a solid surface by mechanical action, which may be sliding, rolling, impact or combination of these operations.
As rice is most consumable crop in world there is huge need of optimization in the rice milling process. In rice polisher most of the rice grains are break due to extensive force applied to grain to remove bran. Optimization in polishing chamber leads to reduction in the rice breakage. Shape of polishing chamber is more important parameter. As the polishing rotor is prone to wearas milling progress, hence the consideration of easy replacement and minimum downtime is another important factor. Cylindrical polishing chamber is always preferred over conical chamber. Second parameter is the rotating speed of polishing wheel. Peripheral speed more than 600m/s is mostly preferred; however the broken percent of rice kernel nearly doubles when Rotating speed is increased from 600 to 1200 rpm.
Quality of rice after milling process is depends on various factors, which include paddy drying, paddy harvesting conditions, environmental conditions, physical properties of paddy kernels, type of rice and quality of milling system components. The objective of this paper is to identify the optimum parameter to achieve uniformly polished yield of rice with less broken. The selection of vertical and horizontal machine to design has large effect on the head rice yield and vertical design is mostly preferred. The optimum moisture content of paddy rice for milling process was reviewed and it is observed to be varied according to the variety of rice grain and it had the least rice breakage when using three abrasive whiteners in series followed by one friction whitener as a polisher. As the cylinder speed increase from 600 to 1000 RPM, the percentage of broken kernels approximately gets doubled. Rice polishing cylinder material of contains two composite materials were binder material and abrasive material.
The flow of processes in a typical modern rice mill: (1) paddy fed into the intake pit; (2) precleaned paddy moves to the rubber roll husker; (3) mixture of brown rice and unhusked paddy moves to the separator; (4) unhusked paddy is separated and returned to the rubber roll husker; (5) brown rice moves to the destoner; (6) destoned brown rice moves to the rice whitener; (7) partially milled rice moves to the second whitener; (8) milled rice moves to the sifter; (9a) (for simple rice mills) ungraded milled rice moves to bagging station; (9b) (for more sophisticated mills) milled rice moves to the polisher; (10) polished rice moves to length grader; (11) head rice moves to head rice bin.
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By ricepolisher, 2018-06-12
Modeling of dynamic abrasion in a rice milling operation provides better understanding of the basic phenomenon, and also for design of optimal polishing systems to obtain higher quality-milled rice. During a milling operation by rice polisher, due to abrasion/friction there is an increase in surface temperature of rice grain. As the temperature of rice kernel increases, the grain experiences thermal stress and leads to crack generation. This probably results in reduction in head rice yield. The model developed predicts the temperature rice of the rice grain in an abrasive milling.
Medium grain brown rice was milled in an abrasive polisher. The rise in the bulk temperature was modelled by energy balance, on the basis of abrasion wear theory. The head rice yield was correlated with the final temperature of the grain and was found to decrease steadily with increase in the bulk temperature of the grain. The developed model accurately predicted well the bulk temperature rise in the rice grains with milling time. Energy utilised for milling was found to be about 33%, whereas, about 10% of the energy was utilised to raise the temperature of the grains, and 55–60% of the total energy was utilised in running the machine in idle conditions.
Features and Advantages of Rice Polisher: 1 It has specially made stainless steel, screw feeder and cam roller for longer life. 2 Can convert my machine as semi silky by adding the water. 3 Infinite adjustment for polishing. 4 A special blower will minimise the brokens by maintain cool temperature inside the chamber. 5 Low maintenance, and easy to operate.There are few economic studies of the paddy separator. However, it plays an important role along the rice supply chain. There is a need for better understanding of the industry in order to obtain economic sustainability and effective policies. China-zjlg has industrial most advanced and complete inspection equipment, which can ensure the quality of the products, welcome to leave a message.