An injection molding machine typically consists of an injection system, a mold clamping system, a hydraulic transmission system, an electrical control system, a lubrication system, a heating and cooling system, and a safety monitoring system.

 

Composition of Injection System: Injection system consists of a plasticizing device and a power transmission device.
Plasticizing device of a screw-type injection molding machine mainly consists of a feeding device, a barrel, a screw, and an injection nozzle. Power transmission device includes an injection cylinder, an injection seat moving cylinder, and a screw drive device (melt motor).
(1) Function of Injection System:
Injection system is one of the most important components of an injection molding machine. It generally comes in three main forms: plunger type, screw type, screw pre-plasticizing plunger injection type. Currently, screw type is the most widely used. Its function is to heat and plasticize a certain amount of plastic within a specified time during one cycle of injection molding machine, then inject molten plastic into mold cavity through screw under certain pressure and speed.
(2) Mold Closing System
Function of mold closing system is to ensure mold closes, opens, ejects product. Simultaneously, after mold closes, it provides sufficient clamping force to resist cavity pressure generated by molten plastic entering mold cavity, preventing mold opening and resulting in defective products. Mold closing system mainly consists of a mold closing device, a mold adjusting mechanism, an ejection mechanism, front and rear fixed mold plates, a moving mold plate, a mold closing cylinder, and a safety protection mechanism.
(3) Hydraulic System
Function of hydraulic transmission system is to provide power for various actions required by injection molding machine according to process, and to meet pressure, speed, temperature, and other requirements of each part of injection molding machine. It mainly consists of various hydraulic components and hydraulic auxiliary components, among which oil pump and motor are power sources of injection molding machine. Various valves control oil pressure and flow rate, thereby meeting various requirements of injection molding process.
(4) Electrical Control System
Electrical control system, in proper coordination with hydraulic system, can realize process requirements (pressure, temperature, speed, time) and various programmed actions of injection molding machine. It mainly consists of electrical and electronic components, instruments, heaters, and sensors. There are generally four control modes: manual, semi-automatic, fully automatic, and adjustable.
(5) Heating/Cooling System
Heating system is used to heat barrel and injection nozzle. Injection molding machine barrels generally use electric heating coils as heating devices, installed on the outside of barrel, and monitored in sections by thermocouples. Heat is conducted through barrel wall to provide a heat source for material plasticization. Cooling system is mainly used to cool oil temperature. Excessive oil temperature can cause various malfunctions, so oil temperature must be controlled. Another area requiring cooling is near feed inlet of feed tube to prevent raw material from melting at feed inlet, which would prevent normal feed.
(6) Lubrication System
Lubrication system is a circuit that provides lubrication to relatively moving parts of injection molding machine, such as moving platen, mold adjustment device, and connecting rod hinge, in order to reduce energy consumption and improve life of parts. Lubrication can be done manually on a regular basis or automatically by electric means.

I. Vertical AC/DC Injection Molding Machine Series:
This type of machine is mainly used for injection molding of connecting wires, various electronic and computer data cables, and power plugs. Precision requirements for injection molded products are not high. It is generally dominated by PVC, PE, and other plastic materials. Specific applicable machine specifications for this product generally have clamping forces ranging from 15T to 35T. Since specific mold capacity and configuration of each manufacturer's model vary, it is essential to request manufacturer to come to factory to confirm specific parameters and specifications of model before purchasing.
II. C-Type Injection Molding Machine Series:
This machine features vertical clamping and horizontal injection. Because it has no guide pillars, it is named for "C" shape of clamping part. This machine has a complex structure and a large injection volume. Due to its wide working area without guide pillars, it is primarily suitable for injection molding various safety-compliant power plugs, such as French, American, and British plugs.
III. Vertical Single-Slide Injection Molding Machine and Double-Slide Injection Molding Machine Series:
This machine is mainly designed for engineering plastics with strict precision requirements. It involves injection molding precision parts or small inserts, and is one of the most optimized molding solutions for inserts. This is because machine has a fixed upper mold and a sliding lower mold. Double-slide type has one upper mold and two lower molds, with alternating operation, making it suitable for inserting or removing precision metal parts. Some two-color molds can also be molded using double-slide injection molding. For general molding products, such as precision electronic connectors, mobile phone connectors, and integrated circuit components, disadvantage of double-slide injection molding is increased labor costs due to two working positions.
IV. Vertical Disc Injection Molding Machines (Rotary Series):
Vertical disc injection molding machines (rotary series) are optimal solution for precision part embedding and two-color molding. This is because machine can be designed with one upper mold and two lower molds or multiple lower molds, offering advantages such as suitability for complex embedding and labor savings.

 

V. Vertical and Horizontal Injection Molding Machines:
Vertical and horizontal injection molding machines are suitable for hardware overmolded inserts with large injection volumes that require a vertical mold structure. Vertical structure facilitates insert placement, while horizontal structure allows for larger injection volumes, making it a product that meets market demand for a combination of vertical and horizontal structures.

1. Preparation
1.1 Check that all machine components and electrical control box are in good working order.
1.2 Check hydraulic oil level and ensure oil level is sufficient. Start motor and observe whether axial piston valve is discharging oil normally.
1.3 Open cooling water valve to connect cooling water supply.
2. Operation
2.1 Mold Installation: Push mold-moving mechanism to its highest position, mount plastic mold onto moving mold plate, unscrew fixed mold plate, align upper mold and fixed mold plate, and tighten screws. Secure lower mold onto moving mold plate. Run mold-moving mechanism and check if mold position is correct.
2.2 Barrel Heating: Turn on heating switch in electrical control box, add plastic to barrel, and heat it thoroughly until it melts.
2.3 Injection Molding Operation: Turn on solenoid valve 8 to raise mold-moving mechanism and close it with plastic mold. Turn on solenoid valve 6 to push injection plunger into barrel for injection. After injection, turn on solenoid valve 6 to push injection plunger out of barrel. Turn on solenoid valve 8 to lower mold-moving mechanism, and then plastic mold can be opened for demolding.

 

3. Maintenance and Care
3.1 Check hydraulic oil level. Replenish as needed, and keep oil clean at all times.
3.2 Lubrication points should be lubricated regularly as specified, and oil filter should be cleaned periodically. Keep area around machine clean and prevent contaminants from entering oil tank.
3.3 After use, wipe machine clean and apply oil to smooth surfaces.
3.4 Regularly inspect electrical components, remove dirt, oil, and dust, keep electrical contacts clean, frequently remove dirt and dust from joints.