Injection molding machine

Abstract

The invention discloses an injection molding machine, comprising a servo-controlled system, wherein the servo-controlled system comprises a control valve, an oil tank, an oil outlet pipe, an oil return pipe, a fixed displacement pump and a hydraulic cylinder as the power of the injection molding machine, the oil outlet pipe and the oil return pipe are connected with the control valve and the oil tank and are arranged between the control valve and the oil tank, front and rear cavities separated by a piston are arranged in the hydraulic cylinder, the two cavities are respectively connected with the control valve, the fixed displacement pump is arranged on the oil outlet pipe, the servo-controlled system further comprises a servo motor, a rotary encoder, a servo drive controller and a pressure sensor, the servo motor is connected with the fixed displacement pump in a transmission way; the rotary encoder is arranged on the servo motor, and the output signals are input to the servo drive controller; the pressure sensor is arranged on the oil outlet pipe, and the output signals are input to the servo drive controller, and the servo drive controller is electrically connected with the servo motor. The injection molding machine has the following advantages: 1, good energy-saving performance; 2, quick respond speed; 3, high repeat precision; and 4, prolonged service life of the hydraulic system.

Description

technical field [0001] The invention relates to an injection molding machine. Background technique [0002] With the development of society, injection molding machines are used more and more widely. The existing injection molding machine servo control system includes a control valve, an oil tank, an oil outlet pipe, an oil return pipe, a quantitative pump and a hydraulic cylinder. The oil outlet pipe and the oil return pipe are connected between the control valve and the oil tank, and the hydraulic cylinder is used as the power source of the injection molding machine. , the control valve controls the on-off of the oil circuit in the two chambers of the hydraulic cylinder, and the quantitative pump is set on the oil outlet pipe to provide pressure for the entire hydraulic system. The existing quantitative pump is usually driven by an asynchronous motor, and the control accuracy of the asynchronous motor is poor. In order to ensure the normal operation of the injection moldin...

AI Technical Summary

Problems solved by technology

The existing injection molding machine servo control system includes a control valve, an oil tank, an oil outlet pipe, an oil return pipe, a quantitative pump and a hydraulic cylinder. The oil outlet pipe and the oil return pipe are connected between the control valve and the oil tank, and the hydraulic cylinder is used as the power source of the injection molding machine. , the control valve controls the on-off of the oil circuit in the two chambers of the hydraulic cylinder, and the quantitative pump is set on the oil outlet pipe to provide pressure for the entire hydraulic system. The existing quantitative pump is usually driven by an asynchronous motor, and the control accuracy of the asynchronous motor is poor. In order to ensure the normal operation of the injection molding machine during use, the asynchronous motor starts at full power for every action of the injection molding machine, and the entire hydraulic system is always in the hydraulic state when the asynchronous motor starts at full power. The use of posed the following problems:

[0003] 1. The asynchronous motor is always in full power operation, which will cause an increase in energy consumption and a corresponding increase in heat generation. Not only the asynchronous motor is easily damaged due to excessive heat, but it will also cause the temperature of the entire workshop to rise. Both equipment and personnel health will be affected;

[0004] 2. The starting current of the asynchronous motor is large, and in a workshop with multiple injection molding machines, the capacity of the entire power grid is required to be large;

[0005] 3. The hydraulic system is always in the hydraulic state when the asynchronous motor starts at full power, and the hydraulic components in the entire system are easily damaged, which affects the service life of the hydraulic system, thereby causing an increase in operating costs;

[0006] 4. The response speed of the asynchronous motor is slow, which is not conducive to the precise control in the injection molding process, and the repeatability is low

[0007] Due to the above shortcomings, the existing injection molding machines cannot effectively meet people's use requirements, so it is necessary to improve

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