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 molding machine injection hydraulic loop achieving high-response injection and an injection molding control method of the injection molding machine injection hydraulic loop. The injection molding machine injection hydraulic loop comprises an injection oil cylinder (3) and a main oil way connected with the injection oil cylinder (3), and further comprises a control oil way. The control oil way is composed of a second solenoid valve (4), a second overflow valve (5) and a cartridge valve (6). The safe pressure of a hydraulic pump system (1) is P1, the work pressure of the second solenoid valve (4) is P2, and P1 is larger than P2. The injection molding machine injection hydraulic loop has the beneficial effects that the control oil way is additionally arranged at an oil inlet (pressure oil inlet) of an injection solenoid directional valve to replace a complex energy accumulator in an existing oil way; through cooperation action of the overflow valve and the cartridge valve, system pressure oil of an injection molding machine before injection keeps constant pressure and flow all the time, and the injection molding machine can obtain the high injection molding response during injection molding; and on the basis of reducing equipment energy consumption, the injection repeated accuracy is improved, and the production efficiency of the injection molding machine is improved.

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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