In plastic processing enterprises, injection molding machine is the most widely used and energy-consuming production equipment.
The promotion and application of frequency converter or servo system on injection molding machines can eliminate the power waste
phenomenon of "big horse trolley" common in injection molding equipment.Make the injection molding machine run in the best
efficiency of the work, to achieve energy saving (about 30%~60% specific reference according to the specific working conditions
of the processed products, improve product quality, reduce oil pollution and noise pollution, improve reliability, extend the service
life of the machine and other advantages.
Production of plastic parts, widely used in national defense, electronics, electrical, daily necessities, etc.
(such as military equipment, electronic instruments, electrical appliances, plastic containers, etc.)
A general injection molding machine mainly includes four parts: injection system, closing system,
hydraulic control system and electrical control system.
Injection system：The injection system includes a hopper, a barrel, a heater, a metering device, and a screw
(the plunger injection molding machine is a plunger and a shunt shuttle). The injection system plays a role in
heating the molten plastic to a viscous flow state and applying high pressure to shoot it into the mold cavity.
Clamping system：It is mainly composed of front and back fixed template, moving template, tie rod, closing
cylinder, connecting rod mechanism, adjusting mold mechanism and product launching mechanism. The mold
closing system plays a role in closing, locking, opening and ejecting the mold.
Hydraulic drive (power) and electrical control system (control)：Ensure that injection molding is performed
accurately according to predetermined process requirements (pressure, speed, time, temperature) and procedures.
Mode locking：The template quickly approaches the fixed template (including slow-fast-slow), and when it is confirmed that
there is no foreign body, the system turns to high pressure and locks the template (maintaining the pressure in the cylinder).
The firing platform moved forward into position：Step forward to the specified position (nozzle close to the mold).
Injection molding：The screw can be set to inject the molten material into the mold cavity at the front end of the barrel with
multiple speed, pressure and stroke.
Cool and hold pressure：According to a variety of pressure and time period, the pressure of the cylinder is maintained while
the mold cavity is cooled and formed.
Cooling and premolding：The products in the film cavity continue to cool, while the hydraulic motor drives the screw rotation
to push the plastic particles forward, the screw is retreated under the control of the set back pressure, when the screw is retreated
to the predetermined position, the screw stops rotating, the injection cylinder is loosened according to the set, and it is expected to end.
Injection Platen Retraction：After the premolding is finished, the shooting platform is retreated to the specified position.
Open the mould：Template back to the original position (including slow - fast - slow).
Thimble：Ejector of thimble.
The use of FR500A series frequency converter to control the oil pump can not only improve the reliability and
service life of the equipment, but also save a lot of power consumption, which greatly improves the economic
efficiency and market competitiveness of the enterprise.
1. Open loop vector control control accuracy ±0.2%, 0.5Hz 180% starting torque.
2. Closed-loop control of oil pump speed and start-stop.The soft start of the motor can reduce the impact
and vibration of the equipment, which can greatly improve the service life of the equipment.
3. The excess power consumption of no-load and low-pressure oil pump is saved, and the general power
saving rate is more than 30%.
The power frequency is reserved for backup, the injection molding plate is used for signal processing,
and the system uses alarm tips.
