High-speed PET Preform Injection Molding System
1, Direct Hydraulic Clamping Unit
The mold clamping system is a full hydraulic type and the clamping force is located at the center of the dies, which is the first of its kind in China. Once the dies are clamped, the parallelism of the die plates is better than that of a mechanical hinge system, as the clamped dies can maintain a better parallelism and keep their force distribution balanced. Meanwhile, when the hydraulic mold clamping system works, the main easily-worn parts are the sealing parts. When the mechanical hinge system works, the hinge movement produces friction between metals. Therefore, after both systems have been at work for a long time, the integration accuracy of hydraulic mold clamping systems remains unchanged but that of a mechanical hinge system may decrease quickly.
2, Toggle Clamping Unit:
Newly designed clamping unit, using the finite element analysis to optimize the stress and deformation of all components, the clamping mechanism has the advantage of running smooth, fast, high strength, good rigidity, etc., and the clamping and ejector use closed-loop proportional valve control, which make a great contribution to high accuracy positioning and high repetition accuracy control.
3,
This system integrates preform removing robot and injection molding peripheral equipment into a whole, thus achieving good control and coordination capability, quick responses and high accuracy. The system's main control center is from Siemens control systems, while critical control elements of the hydraulic system, pneumatic system and temperature control system are from the Rexroth brand, CKD/SMC brand and brand respectively. In addition, its robot driving elements are from Germany's Lenze servo system.
This system has special high-speed cold preform robots with 3 work locations. Its preform removing robot is driven by servo motors from famous brands in Europe, and its preform removing parts are separated from the preform embedding parts, thus decreasing the inertial movement of the preform removing parts and ensure a quick and correct perform removing operation. Preforms are jacked up and cooled in the robot to shorten cooling time of preforms in the molding chamber, thus the forming cycle becomes shorter. Water cooling is used for outer surfaces and air cooling for the inner chamber. When placing the preforms, they will be cooled to the ambient temperature, and it will not to damage them in transportation.
5, Robot Driving Element:
The robot driving elements are from Germany's Lenze servo system, precision and stable.
6, Accumulator:
This system demand different energy when working in the different stage. With the adoption of accumulator, the machine can save extra energy when the hydraulic system need low energy, and supply the saved energy when the machine need more energy, so the system can work very efficient and energy-saving.
7, Hydraulic Component:
The power system of the machine is all hydraulic, and the main hydraulic components use world-famous brands like the VICKERS, STAFFA, YUKEN etc.
8, Hydraulic Oil Filter:
The Hydraulic oil of this system is through two stage oil filter system, the coarse filter and fine filter, to make sure all hydraulic components are working in a clean environment. With the clean hydraulic oil environment, it highly extends the service life of hydraulic components. The back oil is fully filtered to prevent subtle impurities generated by hydraulic component going back to oil tank.
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