Water assistant moulding water-fluid pressure proportioning system

Abstract

The invention discloses a water hydraulic proportional system for water auxiliary forming. It connects the pressure control valve, reversing valve and nozzle in turn at the outlet of the motor-driven water hydraulic pump. It can also be connected to the accumulator to realize energy saving. The pressure sensor feeds back the pressure to the pressure controller to form a closed-loop control. The pressure controller receives the injection pressure command signal from the computer to control the pressure control valve, and then controls the injection pressure. The temperature sensor feeds back the temperature control water tank and Inject the water temperature to the water temperature controller, control the heater to adjust the water temperature in a closed loop, and the temperature and pressure-controlled injection water generated by the water hydraulic proportional system is injected into the plastic melt in the mold cavity through the nozzle to perform water-assisted injection of hollow plastic products forming. The invention is used for water-assisted plastic injection molding, which is the key and core equipment of water-assisted molding technology and the basis for high-quality water-assisted molding production.

Description

technical field [0001] The invention relates to plastic hollow injection molding production equipment, in particular to a water hydraulic proportional system for water-assisted molding. Background technique [0002] In the field of injection molding industry, water-assisted injection molding technology is a new technology developed in recent years, which belongs to fluid-assisted injection molding technology as well as gas-assisted injection molding technology. Compared with the more mature gas-assisted injection molding technology after more than ten years of development, water-assisted molding technology is still in its infancy, but water medium has the advantages of incompressibility, high thermal conductivity, and high specific heat capacity compared with gas, which makes water-assisted molding Compared with gas-assisted molding, molding has the advantages of shorter cooling time and molding cycle, higher product quality (smooth inner surface, uniform thickness, etc.), l...

AI Technical Summary

Problems solved by technology

However, due to the limitations of related equipment technologies, mainly water hydraulic proportional control technology, water hydraulic components, and system technology for providing intermittent high-pressure and large-flow injection water, currently in foreign countries, pneumatic booster systems are mainly used to pressurize water. Provide the required injection water, after the secondary capacity conversion and the limitation of the compressibility of the gas itself, the system efficiency is low, the equipment is bulky and heavy, and the pressure and flow technical indicators related to the production capacity of water-assisted molding are relatively low.

Moreover, water-assisted molding equipment technology is still blank in China

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