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Engine Burning Cylinder Pad Cause and Prevention
Flour processing units, which consist of multiple small-scale counter-roll mills and wheat cleaning and conveying systems, are widely used in rural areas due to their efficiency and ease of operation. These units offer high production efficiency, a high level of automation, strong grinding power, and produce high-quality flour, making them popular among users. However, during regular use, various malfunctions can occur. Below is an analysis of the common causes of these failures:
1. **Motor Failure**
The entire system contains over 10 motors of different sizes. Motor failure is a frequent issue, often caused by excessive heat. High temperatures may result from insufficient bearing lubrication, dirt entering the bearings, damaged bearings, or motor overload. Regular maintenance and proper cooling are essential to prevent such issues.
2. **Cleaning Screen Failure**
(a) The screen may become loose or the frame may shake due to loose bolts or wooden wedges.
(b) Wheat grains may get stuck in the sand because the internal damper of the stone nozzles is too small or the screen slope is not properly adjusted.
(c) Excessive wheat breakage can occur if the gap between the tooth plate and sieve is too narrow, or if the mesh openings are too large or damaged.
3. **Spiral Stirrer Failure**
(a) If the grain outlet does not discharge properly, it could be due to a faulty motor, a blocked discharge port, or a broken stirrer blade.
(b) If the stirrer shaft does not rotate, it might be caused by overfeeding, belt slippage, or mechanical wear.
4. **Pulverizer Failure**
(a) When the machine vibrates, tighten the bolts connecting the grinding head and the rack.
(b) A drop in production may indicate that the spring needs tightening to ensure even roller gaps. Worn grinding teeth should be repaired or replaced.
(c) High flour temperature can be resolved by loosening the rolls. If the rolls are severely worn, they should be repaired or replaced. In summer, turning off the heat source can help.
(d) No bran may be caused by misalignment of the spindle, poor sealing of the screen frame, or a broken screen.
(e) Low or no flour output is typically due to clogged screens.
5. **Winder Malfunction**
When the air is closed, the bag may be sucked in. This can happen due to leaks at joints, impeller wear, or other issues. If the impeller is worn, a rubber plate can be added to the outer edge for protection.
6. **Filter Cartridge Issues**
(a) Excess dust in the room may be caused by an improperly sealed dust collector, loose cloth tubes, or air leaks in the ducts.
(b) Too much flour in the filter cartridge may result from excessive airflow, leakage at the bottom of the powder collector, or a large clearance between the closing impeller and the housing.
7. **Electrical Faults**
(a) If the unit won’t start, check for low voltage, missing phase in the power line, poor wiring contact, broken control circuits, or blown fuses.
(b) If the single machine fails to start, it could be due to poor contact in the control loop, a burned-out AC contactor coil, or similar electrical problems.
Regular inspection, timely maintenance, and proper operation can significantly reduce the frequency of these issues, ensuring smooth and efficient flour processing.