In order to prevent the mold can not be opened, the following preventive measures should be taken:

1. Calculate the clamping force correctly, not the bigger the better.

2. Do not keep the high pressure mode locking state when the machine is shut down.

3. In case of power failure in the mode locking state, it is necessary to deal with it in time. It is necessary to loosen the crosshead nut after a long time.

4. Check the mechanical oil regularly, and do not block the solenoid valve with impurity iron filings.

5. Check the lubrication of the clamping system, and the oil can not be broken to cause the prickling of the guide rod.