Injection molding machine injection hydraulic loop achieving high-response injection and injection molding control method of injection molding machine injection hydraulic loop

Abstract

The invention discloses an injection hydraulic circuit of an injection molding machine for realizing high-response injection and an injection molding control method thereof, which comprises an injection cylinder (3) and a main oil circuit connected to the injection cylinder (3). Including the control oil circuit, the control oil circuit is composed of the second solenoid valve (4), the second overflow valve (5) and the cartridge valve (6). The safety pressure of the hydraulic pump system (1) is P1, and the second solenoid valve ( 4) The working pressure is P2, and P1 is greater than P2. The beneficial effects of the present invention are: by adding a control oil circuit to the oil inlet (pressure oil inlet) of the injection electromagnetic reversing valve, instead of the complicated accumulator in the existing oil circuit, through the overflow valve and the cartridge valve The coordinated actions of the injection molding machine make the system pressure oil of the injection molding machine always maintain a constant pressure and flow rate before injection, so that the injection molding machine can obtain a higher injection molding response during injection molding, and improve the injection repeatability on the basis of reducing equipment energy consumption. Improve the production efficiency of the injection molding machine.

Description

Technical field [0001] The invention relates to an injection hydraulic circuit of an injection molding machine that realizes high-response injection and an injection control method thereof, and belongs to the technical field of mold injection molding machine oil circuit systems. Background technique [0002] The injection response of the injection molding machine refers to the time it takes for the injection speed to accelerate from zero to the maximum during injection. The shorter the time, the better the performance. Especially for the injection molding of thin-walled plastic products, a high injection speed is required. The injection response is a very critical performance index. Generally, a faster injection response makes injection molding easier and requires less clamping force. The traditional injection circuit has no control branch and cannot realize the acceleration before injection. It can only accelerate from zero to the set value after the injection action starts, whi...

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Problems solved by technology

This kind of circuit is to add an accumulator device at the outlet of the oil pump. The injection action is always performed by the pressure oil provided by the accumulator. Since the accumulator itself cannot adjust the flow and pressure, an expensive proportional valve must be used to control the injection cylinder for injection. , and no matter what speed and pressure the actual action requires, the oil pump must first charge the hydraulic oil into the accumulator at the highest pressure, resulting in higher energy consumption

[0004] In addition, because the injection action is always followed by the mold clamping action, the existing injection circuit and its control method will have a process because of the pressure drop after the mold clamping is completed, and this process cannot be exactly the same every time, so If the state of the system pressure oil is different before each injection, it will cause poor injection repeatability. In order to eliminate such deviation, a delay time is often added before injection to wait for the pressure to stabilize, resulting in a decrease in production efficiency

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