& nbsp; The stability of low-pressure casting casting process directly affects the yield of low-pressure casting. A liquid level pressurization device with good repeatability is the foundation and prerequisite for achieving stable casting process, and is a key component of low-pressure casting machine. It is the fundamental guarantee of the quality of low-pressure casting& nbsp;& nbsp; The low-pressure casting liquid level pressurization device adopts high-precision imported pressure sensing to detect the pressure inside the insulation furnace, the imported pneumatic proportional valve controls the intake flow, and PLC is the control core to achieve real-time closed-loop feedback control of the insulation furnace liquid level pressurization. This device can be well adapted to low-pressure casting of metal and sand molds& nbsp;& nbsp;characteristic:Equipped with multi-level linear pressurization function, the pressurization pressure and rate at each level can be arbitrarily set within the process range. Using imported proportional valves and high-precision pressure sensors as detection and execution components, software PID adjustment method is used to achieve real-time closed-loop feedback control of the pressurization process;Real time tracking and setting of pressurization process curves to achieve various pressurization specifications; The pressurization process is automatically completed, free from human influence by operators, and has good reproducibility of the pouring process; Equipped with leakage compensation function, the pressurization process is not affected by gas source pressure fluctuations and insulation furnace leakage (within a certain leakage range), fundamentally ensuring the repeatability and reproducibility of the pressurization process; ● Automatic compensation for the increase in pressure caused by the decrease in metal liquid level in the insulation furnace after each pouring, resulting in a decrease in metal liquid level; The actual pressure and mold temperature during the pressurization process can be selected and saved, and historical pouring process parameters, pressurization pressure and mold temperature can be queried, and the deviation between the actual pressurization parameters and the set pressurization parameters can be analyzed; Cylinder type fast high-temperature exhaust valve, with low exhaust noise, fast exhaust, and high reliability;The liquid level pressure control device can be conveniently equipped on its low-pressure casting machine or used for sand mold low-pressure casting. There is a complete set of pouring control devices with valve groups in the electrical control cabinet, which can be automatically pressurized and controlled during the pouring process by connecting to the compressed air pipeline network and insulation furnace. For the metal mold low-pressure casting machine, after the main machine meets the pouring conditions, a“ is sent to the liquid level pressurization control system; Start pressurizing” After the pouring is completed, the host control device receives the liquid level pressurization control system's signal; Pouring completed” Signal; For sand mold low-pressure casting, after placing the finished sand mold on the working platform and sealing it tightly with the liquid lifting pipe, press the start pressurization button to automatically complete a pressurization pouring process; It can achieve the suspension of aluminum liquid in the lifting pipe, which can well meet the special pouring process requirements of some castings.
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