1. CheckCar interiorWhether the oil pump, control valve and pressure gauge of hydraulic machine are normal and the oil temperature is within the allowable range;
2. Check the mold for cracks and the fastening screws for looseness;
3. Turn on the power switch of the hydraulic machine and start the cooling cycle motor;
4.four-column hydraulic pressStart the main oil pump motor;
5. Check the level of oil in each oil tank, whether there is oil leakage in each oil circuit and hydraulic pipe fittings, and whether each connecting piece is loose;
6. Check the deflection of the pressure pointer of the pressure gauge. If it is found that it swings back and forth or does not move, stop the machine to check the rated pressure of the equipment, and shall not exceed the limit during use:
7. Check and clean the working table or mold of the four-column hydraulic press. Other sundries on:
8. Adjust the working mode changeover switch to position 0 and operate it manually to check whether the upper and lower limit switches of the movable beam are safe and reliable, whether there is abnormal noise in the hydraulic system of the four-column hydraulic press, and whether the photoelectric eye, operation button, emergency stop switch and safety protection device are flexible and reliable;
9. After everything is normal, select the work switch according to the required working mode.