The hydraulic press is a kind of machine that we can use every day. It is divided into: single-arm hydraulic press, four-column hydraulic press, frame hydraulic press, multi-function hydraulic press, etc.; usually used in our pots, bowls, scoops, pots, etc.
Hydraulic presses are also particularly troublesome when repairing. Common problems are as follows:
Abnormal action
The general action is as follows: the master cylinder is fast down, the pressure is slow down, the pressure is maintained, the pressure is relieved, the return stroke, the ejection, the top retreat, and the rest are static. The main cavity has no rod cavity, that is, the A cavity, and the rod cavity is the B cavity. C ejection out of the rodless cavity D
1, no fast down: mechanical four-column, beam, dust jacket improper adjustment too tight or improper bolt adjustment check the secondary support valve, fast-discharge plug-in and this group of solenoid valves check whether the filling valve is normal;
2, no slow down: normal slow down when the back pressure is adjusted at 5~10 MPa, too high system is easy to heat, B cavity safety relief valve is adjusted at 15 MPa, too small to fall easily, too high plug-in failure is easy The pressure squib such as BP1 has no pressure according to the above method, BP1 has pressure, and BP2 has no pressure to eliminate the safety spill valve of the upper cylinder. There is no leakage, and the filling valve is stuck in the open state, so BP1 and BP2 are both leaked. If there is pressure, the oil inlet valve of the upper cylinder of the master cylinder does not open normally.
3, pressure: the main cylinder does not hold the pressure generally four points external leakage can observe the filling valve internal leakage check the main cylinder string oil to the rod cavity, sustainable pressure to open the rod cavity to see if there is a continuous outflow judgment cartridge The valve check valve leaks at the above four points. It is easier to eliminate the case where the pressure is not tight.
4, pressure relief: normal pressure relief pressure is generally adjusted in 3~5 MPa time 2~3 seconds. If the adjustment is improper, abnormal noise will occur, vibration will easily cause mechanical failure, affecting the service life of the whole machine, etc. Attention should be paid to the electrical signal to be the normal low pressure system and solenoid valve of the filling valve.
