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Injection Moulding Machine

Injection moulding machine is the main injection moulding equipment for making plastic products of various shapes from thermoplastic plastics or thermosetting plastics using plastic moulding dies. Divided into vertical, horizontal, all-electric.
Injection moulding machine
In injection moulding, the injection moulding machine can heat the plastic, apply high pressure to the molten plastic, and eject it to fill the mould cavity. Injection moulding machines usually consist of injection systems, mould clamping systems, hydraulic systems, electrical control systems, lubrication systems, heating and cooling systems, and safety monitoring systems.

Injection system
The role of the injection system: injection system is one of the most important components of the injection moulding machine, its role is that in a cycle of injection moulding machine, a certain amount of plastic can be heated in a specified time, at a certain pressure and speed, the molten plastic is injected into the mould cavity through the screw. At the end of the injection, the molten material injected into the mould cavity remains fixed.

Closing system
The function of the mould clamping system: the function of the mould clamping system is to ensure that the mould is closed, opened and ejected. At the same time, after the mould is closed, a sufficient clamping force is supplied to the mould to resist the pressure of the mould cavity generated by the molten plastic entering the mould cavity, thereby preventing the mould from opening, resulting in a poor state of the product.

Hydraulic system
The role of the hydraulic transmission system is to achieve the injection moulding machine to provide power according to the various actions required by the process, and to meet the pressure, speed, temperature and other requirements of the injection moulding machine parts. It is mainly composed of its own kinds of hydraulic components and hydraulic auxiliary components. The oil pump and the motor are the power source of the injection moulding machine. Various valves control the oil pressure and flow to meet the requirements of the injection moulding process.

Electric control
The electrical control system and the hydraulic system can work together to achieve the process requirements and various program actions of the injection machine. Mainly by the electrical appliances, electronic components and meters (as shown on the left) and other components.

Heating and cooling system
The heating system is used to heat the barrel and the injection nozzle. The barrel of the injection moulding machine generally uses an electric heating coil as a heating device, is installed outside the barrel, and is detected by a thermocouple segment, heat provides heat source for material plasticization through the wall heat conduction. The cooling system is mainly used to cool the oil temperature. If the oil temperature is too high, multiple failures will occur, so the oil temperature must be controlled. The other place that needs cooling is near the feeding port of the feed pipe to prevent the raw material from melting at the feed port, resulting in the raw material being not properly fed.

Lubrication system
Lubrication system is the loop of the injection moulding machine, mould adjustment device, connecting rod machine hinge, injection platform and other places where there is relative movement to provide lubrication conditions, in order to reduce energy consumption and improve component life, lubrication can be regular manual lubrication, it can also be automatic electric lubrication.

Safety monitoring system
The safety device of the injection moulding machine is mainly used to protect the safety of people and machines. Mainly by the security gate, security baffle and photoelectric detection components and other components. The monitoring system mainly monitors the oil temperature, feed temperature, and system overload of the injection moulding machine, as well as process and equipment faults, and finds abnormal conditions to indicate or report an alarm.

Pay attention to the following matters when operating the injection moulding machine:
  1. Before the operation of the injection moulding machine, Injection moulding machine operationcheck whether there is water and oil in the electrical control box. If the electrical appliance is damp, do not start the machine. The maintenance personnel should dry the electrical parts and start the machine.
  2. Before the operation of the injection moulding machine, check whether the supply voltage meets, generally should not exceed ±6%.
  3. Check the emergency stop switch, before and after the safety gate switch is normal. Verify that the motor and oil pump are in the same direction of rotation.
  4. Check whether the cooling pipes are long-distance, and pass the cooling water through the oil cooler and the cooling jacket at the end of the barrel.
  5. Before the operation of the injection moulding machine, check whether there are any lubricants in the active parts, and add enough lubricant oil.
  6. During operation, pay attention to the temperature of the pressure oil and do not exceed the specified temperature. The ideal working temperature of hydraulic oil should be kept between 45-50°C and it is generally suitable in the range of 35-60°C.
  7. Pay attention to adjust each trip switch to avoid the impact of the machine during the action, and can not arbitrarily cancel the role of the security door.
  8. After the injection moulding machine is in operation, the plastic in the barrel should be cleaned to prevent oxidation or long-term decomposition of leftovers. Also open the mould so that the toggle mechanism time is locked.

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