Tianyuan Sand Roller

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21

2020-07

The working principle of a rice mill

Release time：2020-07-21 09:13

The operating principle of a rice mill is a complex process that requires consulting specialized technical literature for a thorough understanding. Simply put, brown rice passes through the milling chamber, where internal pressure, the rotation of steel or sand rollers, and air‑blowing from a fan work together to create ample friction and abrasion between rice grains, between the grains and the sieve plates, and between the grains and the rollers. This process removes the outer bran layer and slightly moistens the grains, resulting in a smooth, lustrous finish.

21

2020-07

Abrasive belt deviation

Release time：2020-07-21 09:11

This is typically caused by improper adjustments. Under normal conditions, the abrasive belt should oscillate with an amplitude of 15–20 mm and a frequency of 15–20 cycles per minute, at a moderate speed, with consistent forward and return strokes. If operating outside these parameters, prolonged use may lead to belt misalignment, particularly when the forward and return speeds are uneven. Belt deviation can result from a malfunctioning photoelectric sensor, a faulty oscillation valve, or damage to the oscillation cylinder. Inadequate dust extraction and high dust concentrations can impair the sensor’s proper operation and also contribute to belt misalignment.

21

2020-07

Abrasive belt breakage

Release time：2020-07-21 09:11

Belt breakage is primarily caused by belt misalignment, failure to replace a dull belt in a timely manner, excessive grinding load, contact with hard objects during operation, or defects in the belt itself. Belt breakage should be avoided whenever possible, as it may lead to fire or explosion. When the current of the sanding roller on the machine table becomes abnormal, check whether the abrasive belt has become worn; if so, replace it promptly.

21

2020-07

Abrasive belt wrinkling

Release time：2020-07-21 09:10

Once a sanding belt becomes wrinkled, it can no longer be used. Generally, there are three possible causes of belt wrinkling: First, the sanding roller and the tension roller are not parallel in their vertical projection; shims should be added at the central support cylinder to correct this alignment. Second, moisture absorption softens the belt, leading to wrinkling; drying or sun‑drying methods can be employed. Third, if the sander is left unused for an extended period, the roller surface may rust and become rough, making belt oscillation difficult and causing wrinkling; in such cases, the rollers should be de‑rusted or lightly polished with fine‑grit sandpaper.

21

2020-07

Structure of a Vertical Sand-Roller Rice Mill

Release time：2020-07-21 09:09

The vertical sand‑roller rice mill is primarily used for processing grains such as corn, millet, and sorghum in northern China. It is widely employed in small and medium‑sized grain processing plants and rural communities. In particular, the resulting corn grits are round, smooth, and resemble pebbles, offering an excellent texture when cooked. I. Structure of the Vertical Sand‑Roller Rice Mill 1. Feed Section: includes the feed hopper and the feed gate. 2. Whitening Section: comprises the grain‑diverting vanes, sand rollers, bran sieve, rice‑discharge vanes, adjustment handwheel, cutting blade, discharge gate, and rice outlet nozzle. 3. Bran‑Removal Section: consists of pulleys, a fan, a bran‑removal device, an airflow‑adjustment plate, and a bran‑discharge opening. The efficiency of bran removal is controlled by adjusting the airflow. Vertical…

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