Frequency-converting control magnetic suspension screw rod mechanism for injection molding machines

Abstract

The invention discloses a frequency-converting control magnetic suspension screw rod mechanism for injection molding machines. The frequency-converting control magnetic suspension screw rod mechanism for injection molding machines comprises a barrel and a screw rod arranged at the internal axis of the barrel. A plurality of magnet assemblies are arranged on the screw rod in the axial direction. The barrel is provided with a plurality of three-phase windings arranged corresponding to the magnets. Due to the facts that permanent magnets are arranged on the screw rod and the three-phase windings are installed on the barrel, high-speed control over the magnetic suspension screw rod movement can be realized by controlling the power-on frequency of the three-phase windings, and the injection molding efficiency is improved. Moreover, the magnetic suspension screw rod is directly suspended without any supporting component, the screw rod cannot be abraded, and the service life can be effectively prolonged; meanwhile, the hardware mechanical cost of injection molding equipment can be reduced; and besides, no noise is generated during movement of the screw rod, pollution to the environment is avoided, and the auditory system of operation workers is effectively protected. The frequency-converting control magnetic suspension screw rod mechanism can be widely applied to injection molding machine products.

Description

technical field [0001] The invention relates to the technical field of injection molding machine equipment, in particular to a frequency-variable control magnetic levitation screw mechanism for an injection molding machine. Background technique [0002] The processing process of the current injection molding machine is: the polymer (plastic) particles are heated and plasticized in the barrel to reach a fluid state, the hydraulic system provides power to drive the screw to rotate and move left and right, and the molten polymer material is injected under the push of the screw. When the mold cavity is full, when the plastic melt cools and solidifies in the mold to a certain extent, the mold is opened, and the product is taken out, that is, an injection molding cycle is completed. The screw movement (rotation, left and right or front and back) of the existing injection molding machine is powered by a hydraulic system or an electric motor. The rotation of the screw depends on th...

AI Technical Summary

Problems solved by technology

[0004] 1) The power is generated through the hydraulic system through the hydraulic oil, which pollutes the environment and has a large energy consumption and waste of resources;

[0005] 2) The movement direction and speed of the screw are adjusted by the hydraulic cylinder and the hydraulic motor, so that the movement speed of the screw is limited, which cannot meet the requirements of high-speed injection molding processing;

[0006] 3) Pushing the screw through the hydraulic cylinder will make a lot of noise, pollute the environment, and affect the auditory system of the operator;

[0007] 4) The screw is directly connected through the mechanical structure, the screw is easy to wear, the accuracy will be damaged over time, and the screw or hydraulic cylinder will be damaged if it is serious

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