1. Motor reversal: When the main drive motor is not completely stopped, the speed of the coal mill may be reversed, resulting in the reversal of the internal parts of the coal mill, thus generating a reverse impact force and causing damage to the coal mill.
2. The grinding roller falls off: when the coal mill is running, the grinding roller is fixed on the shaft of the coal mill through high-strength bolts. If the main drive motor does not stop completely, the grinding roller will be released, which may cause the grinding roller to fall off during high-speed reverse rotation, thus causing serious damage to the coal mill.
3. Equipment damage: When the coal mill is running, the internal components are in a high load state. If the main drive motor is not completely stopped, the grinding roller may be put down, which may lead to excessive impact on internal components, resulting in damage or wear.
4. Safety risk: During the operation of the coal mill, the operators need to operate in strict accordance with the operating procedures. If the main drive motor does not stop completely, the grinding roller may be put down, which may lead to injury to the operator or damage to the equipment, thus increasing the safety risk.