Water moulding water-fluid pressure ratio system
A water-hydraulic, proportional technology, applied in the field of plastic hollow injection molding production equipment, can solve the problems of low pressure and flow technical indicators, large and heavy equipment, low system efficiency, etc., to improve molding capacity and product quality, accurate pressure real-time computer control effect
Inactive Publication Date: 2007-07-18
ZHEJIANG UNIV
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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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[0033] The process of water-assisted injection molding includes 1) boosting the pressure of the water hydraulic system to the initial pressure of water injection; 2) the stage of maintaining the initial pressure before water injection starts; 3) the water injection process, the injection water pressure rises according to the pressure curve of the injection pressure control command 18 to high pressure; 4) In the stage of high pressure holding and cooling, small flow of water is injected to compensate the cooling shrinkage of the plastic melt; 5) Pressure reduction and drainage; 6) Mold ejection, intermittent work.
[0034] Referring to Figure 1, the first embodiment of the water-assisted forming water hydraulic proportional system includes a temperature-controlled water tank 1, a water tank temperature sensor 2, a heater 3, a water temperature controller 4, a water temperature control command 5, a filter 6, a motor 7, Water hydraulic pump 8, unloading overflow valve 9, accumulat...
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The present invention discloses a water auxiliary moulding water hydraulic proportion system. It is characterized by that in the outlet of water hydraulic pump driven by motor are successively connected a pressure control valve, a reversal valve and nozzle, between the pressure control valve and reversal valve a booster can be used for implementing pressurization, between the pressure control valve and water hydraulic pump an accumulator can be connected for saving energy, the pressure sensor can be used for feeding back the pressure to pressure controller so as to form closed-loop control, the pressure controller can be used for receiving injection pressure instruction signal given out by computer to control pressure control value and further control injection pressure, the temperature sensor can be used for feeding back the temperature of temperature-controlled water tank and the temperature of injection water to the water temperature controller, the water temperature controller can be used for controlling heater closed-loop to regulate water temperature, the temperature produced by water hydraulic proportion system and injection water controlled by pressure can be injected into the plastic melt in the mould cavity by means of nozzle so as to implement water auxiliary injection moulding of hollow plastic product.
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...
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IPC IPC(8): B29C45/76B29C45/82B29C45/57B29L22/00
CPCB29C45/1732B29C2045/1707B29C45/1704
Inventor 周华张增猛杨华勇
Owner ZHEJIANG UNIV
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