Why the vertical injection molding machine cannot open the mold?

In the process of maintenance of vertical injection molding machine, it is often encountered that the mold cannot be opened. What is the reason for the failure? Haisen Machinery will tell you.

1. No action under pressure

First, check whether the mold opening valve indicator light on the output board is on or not. If it is on, the computer output is normal, and there is a problem with the circuit from the computer to the mold opening valve. Action, if the mold can be opened smoothly after the top, it is to confirm the route problem and re-pull a line to solve it.

2. No action without pressure

But check that the computer output board is normal, there is pressure speed, the pet preform mold opening valve has output, and the computer homepage is displayed. In this case, check other actions, such as shooting station and shooting seat found to be normal, indicating that this phenomenon belongs to mold opening Uniformity, the general inspection is that one person opens the mold, and the other uses a multimeter to measure whether the voltage of the mold opening valve coil is around 22-30V. If so, temporarily insert the mold opening valve coil into the plug and open the mold. If there is pressure but no action, as long as you disassemble the mold cylinder, there must be a piston loosened from the piston rod.

3. There is mold opening action under pressure, but mold cannot be opened

It means that the output board is normal, and the circuit from the output board to the valve is also normal. There are four situations:

The first type: the fastening screw of the piston of the clamping cylinder is loose, causing the screw to pull in the cylinder, such as the piston rod being stuck.

The second type: mechanical reverse lock, the best method is to disassemble the clamping oil pipe and operate with a jack, so that it will not cause damage to the machine.

The third type: unmovable caused by machine twisting (such as twisting and burning to death)

The fourth type: oil interference and circuit interference caused by interference) If the valve core is clamped and the injection mold is opened at the same time, the oil pump cannot reach the pressure and flow required for mold opening, and of course the mold cannot be opened. ; Another kind of interference is the interference of the circuit, such as the mold opening wire and the mold clamping wire are connected, because the mold opening valve and the clamping valve work at the same time, the pressure is about 20 kg, and the mold cannot be opened.

What is the reason for the failure of the vertical injection molding machine to open the mold? The failure to open the mold is mainly divided into three failure phenomena: there is pressure without action, pressure with action, and no pressure without action.