Analysis of three aspects of injection molding machine failure to open the mold

In the maintenance of injection molding machines, we often encounter the failure to open the mold. The failure to open the mold is mainly divided into no action with pressure, pressure with action, no pressure without action three kinds of failure phenomena.

1. No action with pressure.

First look at the output board to open the molded valve display light, if the light, the computer output is normal, the computer to open the molded valve line problems, the simplest way is to use a small electric pen top open the molded valve, another person to open the mold action if the top can open the mold smoothly, is to confirm the route of the problem, pull a new line on the solution (circuit problems).

2. there is pressure to open the mold action, but can not open the mold.

It means that the output board is normal and the circuit from the output board to the valve is normal. There are four cases here.

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

The second kind: mechanical anti-lock, the best way, disassemble the clamping oil pipe, with a jack operation, so that the machinery will not cause damage.

The third kind: the machine twist caused by the pull can not be caused (such as twisted edge burned to death, etc.).

The fourth: interference caused by interference (oil interference and circuit interference), such as spool clamping, and at the same time to open the mold action situation, the oil pump oil supply can not reach the pressure and flow required to open the mold, of course, can not open the mold; another kind of interference is the interference of the circuit, such as the line of the mold and clamping mold wire has a connection, because the opening valve and clamping valve work at the same time, about 20 kg pressure, also can not open the mold.

3. no pressure and no action:

But check the computer output board is normal, there is pressure speed, open mold valve has output, the computer home page is displayed, in this case, we will check other actions, such as shooting table, shooting seat found to be normal, indicating that this phenomenon belongs to the open mold unity, the general check for a person to open the mold action, another person with a multimeter, measuring whether the open mold valve coil voltage of about 22 - 30V, if there is, we will temporarily pull the plug out of the open mold valve coil, open the mold action, if there is pressure and no action, this time we just need to disassemble the mold cylinder, there must be a piston inside from the piston rod loose.

Because the injection molding machine oil circuit is largely the same, open the mold there is this situation, other actions will also be so. Repair machine is to summarize, from this fault, we found that the repair machine simple and complex, simply put, from the circuit, hydraulic, oil, mechanical four aspects, all changes remain the same.

Said complex, we generally want to pay attention to the order of troubleshooting, from simple to complex, that is, circuit, hydraulic, oil, mechanical, if the order of inspection is not appropriate, repair up both laborious and time-consuming.