Plunger pump type hydraulic injection moulding machine system driven by servo motor and control method thereof

Abstract

The invention discloses a plunger pump type hydraulic injection moulding machine system driven by a servo motor. The system comprises an oil tank, a servo pump, a mould height motor, a mould clamping cylinder, an ejector cylinder, a movable ejection cylinder, a glue-ejecting cylinder, a glue-smelting motor and an electronic ruler measurement sensor and also comprises a computer controller, a pressure and speed comprehensive control module, a servo driver, the servo motor and a pressure sensor. The invention also discloses a control method of the plunger pump type hydraulic injection moulding machine system driven by the servo motor. In the control method, the pressure sensor and the torque control of the servo motor are adopted, the multilevel control of pressure and flow can be realized;real-time closed-loop control is adopted to control the pressure and flow during injection moulding; and in the control process, the instructions on the pressure and flow are compared with feedbacks in real time and some parameters such as the speed, pressure and current at each moment are controlled accurately, thus effectively realizing technical motions such as the mould open / closing, ejection, glue ejection and glue smelting of the injection molding machine and the closed-loop follow control of the oil cylinder. The method of the invention has the advantages of high precision, high speed and efficiency, energy-saving, environmental friend, low noise and the like.

Description

technical field [0001] The invention relates to the field of hydraulic injection molding machines, in particular to a hydraulic injection molding machine system driven by a servo motor and a control method thereof. Background technique [0002] The process of injection molding machine is generally divided into several stages such as clamping, injection, melting, pressure holding, cooling, and mold opening. Each stage requires different working pressure and flow. For servo pump motors, the injection molding process is under varying load conditions. In the hydraulic system of the quantitative pump, the servo pump motor provides a constant flow at a constant speed, and the excess hydraulic oil returns through the relief valve. This process is called high-pressure throttling. [0003] In the injection molding process, the stages of mold clamping, injection, filling, melting, cooling, and mold opening have different pressure requirements. The mold opening stage only needs to ens...

AI Technical Summary

Problems solved by technology

Its disadvantages are: there are inherent problems such as high power consumption, heavy oil pollution, low efficiency, low control accuracy and high noise.

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