Injection molding machine hydraulic control circuit and method for high-speed and high-precision injection
A control loop and injection molding machine technology, applied in the field of injection molding machines, can solve the problems of limited flow of a single plate servo valve, poor loop ejection accuracy, and high response requirements, and achieve improved braking response, fast injection response, and accurate positioning. Effect
Active Publication Date: 2022-02-18
HAITIAN PLASTICS MACHINERY GRP
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Problems solved by technology
Disadvantages: 1. The flow rate of a single plate-type servo valve is limited, and the response of a large-size plate-type servo valve to a smaller-size valve is obviously insufficient. For injection processes that require high-precision injection and high response requirements, or require large flow rates, this The shortcomings of similar control loops are obvious
2. Since the servo valve only controls the injection accuracy, the ejection accuracy of this type of circuit is poor
Method used
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[0020] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the invention is not limited to these embodiments.
[0021] Such as figure 1 As shown, a high-speed and high-precision injection molding machine hydraulic control circuit is characterized in that it includes: an accumulator 100, a liquid filling control valve group 200, a pressure relief valve group 300, a liquid discharge control valve group 400, and a control valve for the injection molding machine. The first servo valve 500 for the injection cavity and the second servo valve 600 for controlling the ejection cavity of the injection molding machine, and the pressure relief valve group 300 are used to release the pressure of the accumulator during the working process and after it stops working to prevent its pressure from being too high When a dangerous event occurs, the filling con...
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The invention discloses a high-speed and high-precision injection injection molding machine hydraulic control circuit and method, belonging to the technical field of injection molding machines, which solves the problem of poor injection accuracy and ejection accuracy, slow response, and inability of the hydraulic control circuit of the existing injection molding machine. problem of precise positioning. The hydraulic control of this high-speed and high-precision injection molding machine is convenient, including that when the injection molding machine injects, the pressure oil reaches the liquid filling control valve group through the interface, and the liquid filling control valve group controls the pressure oil to charge the accumulator, and the pressure in the accumulator The oil reaches the first servo valve through the drain valve group, the first servo valve enters the injection cavity of the injection molding machine through the pressure or flow control set by the injection molding machine system, the second servo valve opens, and the injection cavity of the injection molding machine The pressure oil enters the oil tank through the second servo valve, which separates and controls the pressure and flow of the injection cavity and the ejection cavity, and improves the brake response during high-speed injection, making the injection response faster and the positioning more accurate.
Description
technical field [0001] The invention relates to the technical field of injection molding machines, in particular to an injection molding machine hydraulic control circuit and method for high-speed and high-precision injection. Background technique [0002] With the increasing demand of injection molding machines for high-speed and high-precision injection, the conventional injection circuit uses an accumulator + a single plate servo valve to control the hydraulic circuit of the two chambers of the injection cylinder. Shoot back to provide power. A single servo valve synchronously controls the oil inlet and outlet of the injection cylinder. This circuit can meet the vast majority of production needs. Disadvantages: 1. The flow rate of a single plate-type servo valve is limited, and the response of a large-size plate-type servo valve to a smaller-size valve is obviously insufficient. For injection processes that require high-precision injection and high response requirements...
Claims
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IPC IPC(8): B29C45/82
CPCB29C45/82
Inventor 郑海伟方钱张旭峰周兴刚戚科峰
Owner HAITIAN PLASTICS MACHINERY GRP