In the maintenance of injection molding machines, we often encounter a variety of failures of some injection molding machines. Now take the common Dongguan injection molding machine as an example for analysis. Injection molding machine can not open mold is divided into the following three kinds of failure phenomenon:

1. There is pressure and no action: at first, we must first look at the open valve of the output board. The light is not bright. If it is bright, it means that the output on the computer is normal. If we have the line from the computer to the open valve, If the problem is the case, our simplest test method is to have a person use a small electric pen to open the mold valve. Another person's words will open the mold action. After the top is opened, the mold can be successfully opened. It is to confirm the problem of the route. We can solve the problem by re-pulling a wire (circuit problem).

2. There is pressure to open the mold, but it cannot open the mold. In this case, the output board of the injection molding machine is normal, and if the output board to the valve circuit is normal. There will be the following situation, the first kind: the fastening screw inside the piston of the clamping cylinder is loose, so that the screw will cause pulling in the cylinder, for example, the piston rod will get stuck. Second: The machine is locked. The best way to do this is to disassemble the clamped tubing and then use the jack to operate it. This will not damage the machine. The third kind: for example, a pull caused by a burned to death. The fourth type is caused by oil interference and circuit disturbance, and at the same time, there must be a mode-opening operation. If the oil supply of the oil pump does not reach the pressure and flow required for opening the mold, then of course it cannot be over-opened. Of course, there is another type of interference that interferes with the circuit. For example, the open wire is connected to the mode-locked wire, and the mold-opening valve and the clamp valve work at the same time. This creates pressure. It will be around 20 kilograms, which is also impossible to open.

 3. There is no pressure and no action, check the computer output board is normal, there is pressure pressure and output of the valve and the computer home page are displayed, in this case, we need to check the action of other machines, such as If the shooting table and the shooting base are found to be normal, it means that this phenomenon belongs to the single nature of mold opening. We generally check that one person opens the mold action, and the other person uses a multimeter to measure the voltage of the open mold valve coil. Around -30V, if any, we must temporarily pull the plug of the mold opening valve to open the mold. If there is only pressure and no action, we must disassemble the mold cylinder. There will be a loose piston or rod.

Because the path of the oil of the injection molding machine is basically the same, we usually have this kind of situation when we open the mold, and other actions of the injection molding machine will also be like this. In the overall repair of injection molding machines, we found that repairing the injection molding machine is simple and complex, that is, it is generally done from the four aspects of circuit, hydraulic pressure, oil circuit, and machinery, but we check the order of To be appropriate, if it is not appropriate, we will be very troublesome to repair it.

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