Liquid level height control system for continuous directional solidification apparatus

Abstract

The invention provides a liquid level height control system used for continuously directional solidification equipment, which comprises a hydraulic cylinder, a piston connecting rod, a fixing device, a suspension arm, a liquid level control rod, a liquid level probe, a water supply pipeline, an overflow electromagnetic valve, a water inlet electromagnetic valve and a time delay control circuit, wherein the water supply pipeline is connected with the hydraulic cylinder through the water inlet electromagnetic valve, the overflow electromagnetic valve is connected between the water inlet electromagnetic valve and the hydraulic cylinder, the hydraulic cylinder is fixed on the fixing device, the piston connecting rod is connected with the suspension arm, the liquid level control rod and a balancing weight are fixed on both ends of the suspension arm respectively, the liquid level control rod is inserted into an inner cavity of a crucible, and the liquid level probe, the overflow electromagnetic valve and the water inlet electromagnetic valve are connected with the time delay control circuit. The system realizes the integrated closed loop automatic control for monitoring and controlling the liquid level height during the continuously directional solidification; moreover, the system also has the advantages of simple structure, easy operation and good stability, and can be applied to the continuously directional solidification equipment or other horizontal continuous casting equipment needing to control the liquid level height.

Description

technical field [0001] The invention relates to continuous directional solidification equipment and technology, in particular to a liquid level closed-loop automatic control system using an overflow hydraulic cylinder transmission device. Background technique [0002] Continuous directional solidification technology (Ohno Continuous Casting, referred to as OCC method) combines the mature continuous casting technology in industrial application with advanced directional solidification technology, and can produce near-formed and infinite-length metal single crystal wires and profiles with complex cross-sections. Its main feature is to change the cold casting mold in continuous casting to heating casting mold, avoid nucleation on the mold wall, and form the condition of one-way solidification. in the opposite direction) to obtain single crystals and unidirectionally solidified columnar crystal ingots. The OCC method can be used to prepare single crystal metals with smooth surfa...

AI Technical Summary

Problems solved by technology

The fluctuation of the indenter will affect the position of the liquid-solid interface and the temperature of the mold, resulting in unstable surface quality of the metal single crystal, uneven diameter and even liquid leakage, which will lead to casting failure

However, the drawing casting speed of continuous directional solidification is slower (20-200mm / min), and the consumption speed of the corresponding molten metal in the crucible is slower, about 0.2-2mm / min. High precision requirements for motors and mechanical transmissions

In addition, in the initial stage of casting and in the process of adjusting the casting speed, the liquid level and pressure head fluctuate greatly, so the stable control of the liquid level has always been an insurmountable problem, which limits the continuous directional solidification equipment and Practical process of technology

[0004] The existing domestic continuous directional solidification technology mostly adopts the liquid level control technology used in ordinary continuous casting production, that is, graphite electrodes are used to set the height of the metal liquid level (a metal liquid level detection and control device for thermal continuous casting, China Patent 01131741.8, hot-type continuous casting liquid level graphite head, Chinese patent 200720040459.x), this technology has the disadvantages that the graphite electrode is easy to oxidize and burn, and the conductivity deteriorates. Harmonized for integrated control

There is a patented design that uses a laser range finder to monitor the liquid level (control method and equipment for metal single crystal continuous casting process, Chinese patent 200510023514.x), but affected by factors such as high temperature radiation and heat insulation layer interference, its The implementation process is more complicated

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