The fully automatic hot press tablet press is widely used in the production of electronics, pharmaceuticals, material processing, and other fields due to its automated heating, pressurization, and cooling control. Long term operation or improper maintenance can cause various problems that affect production efficiency and product quality. Here are several common problems and corresponding solutions:
1、 Mechanical transmission system malfunction
1. Servo motor does not operate/lags
Reason: Drive overload alarm, mechanical component jamming, or brake not released.
Solution: Check the alarm code and reset it, clean the encoder, lubricate the screw guide rail, and if it is ineffective, check the brake circuit.
2. Displacement accuracy exceeds the tolerance
Reason: Wear of screw nut or misalignment of servo parameters.
Solution: Replace the nut pair and gradually adjust the position ring gain.
2、 Hydraulic system malfunction
1. Insufficient pressure/fluctuation
Reason: Wear of oil pump, blockage of pressure regulating valve, or leakage of oil circuit.
Solution: Replace the oil pump, clean the pressure regulating valve, repair leaks and replace seals, and regularly replace hydraulic oil.
2. Pressure holding failure
Reason: Proportional valve leakage or carbonization of high-pressure hose.
Solution: Check the wear of the valve core (replace if the return oil flow rate is greater than 5 liters/minute), and replace the high-temperature resistant hose every 1000 hours.
3、 Temperature control system malfunction
1. Heating temperature does not meet the standard
Reason: Damaged heating tube (normal resistance 50-100 Ω), PID parameter imbalance, or damaged insulation layer.
Solution: Replace the heating tube, set the PID parameters (with a ratio of 15% and an integration time of 100 seconds), and repair the insulation layer.
2. Large temperature fluctuations
Reason: Poor contact of thermocouple or insufficient heating power.
Solution: Polish thermocouple solder joints, adjust heating tube power to match hot plate size.
4、 Electrical and control system malfunction
1. HMI communication interruption
Reason: Loose RS485 cable or power fluctuation.
Solution: Tighten the connector and install UPS voltage stabilizing equipment.
2. Chaotic program logic
Reason: PLC storage damage or signal interference.
Solution: Restore the backup program and install a filtering module for the switch signal.
5、 Security maintenance suggestions
Regularly check the wear of the guide rail (slight wear can be ground with an oilstone, severe wear needs to be replaced).
The wear of the rod or bending of the punch in the die should be replaced in a timely manner to avoid affecting the weight of the tablet.
Wear of the outer circle of the pressure wheel or lack of oil in the bearing can increase resistance and require regular lubrication or replacement.