Everyone features a limited acceptance of the noise of the automated rice mill. insight of the size of the noise, it cannot exceed 50 ～ 60dB (A) during the day, and therefore the noise must not exceed 40 ～ 45dB (A) in the dark. We do useful control over the noise of the rice mill as follows:
I. Consider all the equipment, operation, and maintenance of every component of the rice milling room to scale back noise.
(1) so as to make sure the graceful operation of the automated rice mill and reduce vibration, it's necessary to see the extent of the rice mill equipment, tighten the anchor bolts, and it's necessary to perform a static balance test before the rollers are used. the tactic is: put the 2 ends of the sand roller shaft on a calibrated level knife edge or two parallel brackets, and roll it repeatedly. If the orientation after each suspension is unchanged, it means the roller is heavier on the lower side. At this point, roll 1-2 sections of sand rolls 180 ° and test from the start to regulate the load. If it's still untreated, you'll use a sander scraper to scrape off a part of the sand surface layer during a biased direction before testing. it's necessary to succeed in equilibrium. Emphasis on severe, sandstone rollers that cannot be graded really stop using, otherwise the machine in production will specialise in severe sander rollers, which can cause severe vibration, and even damage the rollers and equipment.
(2) The surface of the sanding roller is uneven, and therefore the sanding roller is employed for trimming. When dressing the sand roller, rock bottom of the groove and therefore the fringe of the groove should be rounded to scale back rice grain damage. When repairing, the sand roller should be installed on the shaft, and therefore the shaft should be suspended to stop the sand roller from touching the bottom and damaging the sand surface. within the trimming process, the tapping should be light, the trowel should be fast, and therefore the groove standard should be correct.
II. The reduction and control of fan noise are partly caused by the design and manufacturing process of the fan, but also partly caused by the rice processing enterprise within the process of operation. it's necessary to strengthen operation and maintenance to regulate the noise of the fan.
(1) When purchasing a rice mill, it's not only necessary to work out the sort of kit to be purchased consistent with the wants of the method equipment, but it's also necessary to concentrate to the choice of the equipment manufacturer and therefore the level of manufacturing; it's not necessary to think about the function of the most body of the rice mill together The function of the fan equipped with the rice mill must be considered. it had been found in practice that the background level of the equipment of an equivalent sort of fans from different manufacturers is different, even under equivalent working conditions. As for the low-noise fan, its functions are better altogether aspects, and it's stable and reliable when used, and features a long life. during this way, sailing from the source of controlling fan noise is especially deserve our attention.
(2) Select reasonable fan operating parameters. Different operating parameters of the fan will cause different noise. At high air volume and high speed, the noise is additionally greater. for instance, the quantity of air blown out by the fan of the rice mill should make the airflow have satisfactory K.E. to blow the rice grains, and take the rice bran through the sieve hole. The wind speed of the spray trough should be above the levitation speed of the rice grains. The wind pressure should be ready to overcome the network resistance to take care of all the required air volume to succeed in the above wind speed. generally, the specified air volume per ton of rice per hour is 100 ~ 150m3 / h, the outlet wind speed of the spray trough is 12 ~ 14m / s, and therefore the wind pressure is 100 ~ 300Pa.
Ⅲ. Noise control of transmission motor and transmission belt
(1) Motor cooling fan blades must be subjected to strict static and equilibrium proofs before they will be used. additionally , the space between the motor cooling fan blades and therefore the air guide ring should be reasonably selected to effectively reduce the rotating noise of the motor cooling fan blades.
(2) Reasonably select the parameters like the form standard of the motor cooling blade and therefore the diameter standard of the blade , and effectively reduce the eddy current noise of the motor cooling fan.
(3) If the motor has low-frequency electromagnetic noise, it indicates that the motor stator has pain, and therefore the air gap is uneven.The motor stator are often corrected or replaced to eliminate the low-frequency electromagnetic noise. If the motor has high-frequency electromagnetic noise, indicate the motor rotor. There are disadvantages. The high-frequ
