China currently produces and sells about 20,000 rice mills each year. Among them, rotary sieve rice mills have more specifications, 10, 15, 30, 50, and 100 t/d, with annual production and sales of about 3,000. Rotary screen rice mills can be used for white or multi-machine whitening in one machine, and more as precision rice mills. The white roller of this type of rice mill is mostly an iron roller or an iron roller type roller. Since the roller is short, the rice screen and the roller rotate in the same direction, and the inner and outer layers of the rice fluid in the whitening room are easy to transpose and tumble, and the rice grains and the rice sieve are The relative sliding speed of the surface is relatively small, so the broken rice rate is low and the milling accuracy is high, which is popular with users. However, the mechanical transmission system of the rotary sieve type rice mill has many malfunctions, such as the flat belt drive is easy to slip, and the worm gear and the gear pair wear badly. It has been observed that the non-working surfaces of gear teeth and worm gear teeth are prone to wear and even break.
This phenomenon is worthy of analysis and research.
Design Example of Rotary Meter Screen Drive System Considering the particularity of the force transmission of the rotary screen rice mill, the transmission system of the existing rotary meter screen cannot be designed and calculated according to the force energy transmission route during no-load, and the rice mill must be used. When working, the feedback torque of the rotating rice screen, that is, the frictional torque Ms of the inner wall of the rice screen is the design basis. At the same time, the bad condition when the rice mill is boring is needed.
The calculation formulas of the torques M and Ms of the roller shaft and rotary meter screen of the rotary sieve rice mill have been introduced. The axial, radial and tangential stresses and distribution of the rice fluid in the whitening chamber are very complicated. At present, no accurate determination has been made.
In order to properly design the mechanical transmission system of the rotating rice screen to ensure the strength and service life of the main transmission parts, the design data of the engineering design calculations are now used to calculate and design the rotary meter.
(1) Rotary sieve rice mills have completely different energy transmission routes when they are unloaded and loaded. When the load is applied, the motor is transmitted through the V-belt to transmit the force and motion to the roller shaft. The force of the roller and the high-speed rotary motion cause the rice grains in the whitening chamber to be rubbed away from the whiteness. At the same time, as a flexible carrier, the rice grain fluid transfers the remaining energy to the rice sieve. The friction torque Ms of the rice sieve is fed back to the roller shaft through gears, worm gears and flat belts.
(2) The design of the mechanical drive system for the rotary screen must be based on the meter friction torque Ms and consider the serious situation when the rice mill is boring.
(3) The faults and calculation results of the existing rotary sieve rice mill rice sieve mechanical transmission system all indicate that the main transmission components have insufficient strength.
(4) It is recommended to install an overload safety device in the rotary screen mechanical transmission system.
This phenomenon is worthy of analysis and research.
Design Example of Rotary Meter Screen Drive System Considering the particularity of the force transmission of the rotary screen rice mill, the transmission system of the existing rotary meter screen cannot be designed and calculated according to the force energy transmission route during no-load, and the rice mill must be used. When working, the feedback torque of the rotating rice screen, that is, the frictional torque Ms of the inner wall of the rice screen is the design basis. At the same time, the bad condition when the rice mill is boring is needed.
The calculation formulas of the torques M and Ms of the roller shaft and rotary meter screen of the rotary sieve rice mill have been introduced. The axial, radial and tangential stresses and distribution of the rice fluid in the whitening chamber are very complicated. At present, no accurate determination has been made.
In order to properly design the mechanical transmission system of the rotating rice screen to ensure the strength and service life of the main transmission parts, the design data of the engineering design calculations are now used to calculate and design the rotary meter.
(1) Rotary sieve rice mills have completely different energy transmission routes when they are unloaded and loaded. When the load is applied, the motor is transmitted through the V-belt to transmit the force and motion to the roller shaft. The force of the roller and the high-speed rotary motion cause the rice grains in the whitening chamber to be rubbed away from the whiteness. At the same time, as a flexible carrier, the rice grain fluid transfers the remaining energy to the rice sieve. The friction torque Ms of the rice sieve is fed back to the roller shaft through gears, worm gears and flat belts.
(2) The design of the mechanical drive system for the rotary screen must be based on the meter friction torque Ms and consider the serious situation when the rice mill is boring.
(3) The faults and calculation results of the existing rotary sieve rice mill rice sieve mechanical transmission system all indicate that the main transmission components have insufficient strength.
(4) It is recommended to install an overload safety device in the rotary screen mechanical transmission system.
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SHANDONG XINGHAN MATERIAL CORPORATION , https://www.xinghansteel.com