Non-contact liquid level detection method and device for molten aluminum holding furnace

Abstract

The invention relates to a non-contact liquid level detection method and device for a molten aluminum holding furnace, which are characterized in that an infrared detector and an infrared sensing processor are mounted on the side surface of a sealed holding furnace, and the infrared sensing processor is provided with a functional structure for receiving and processing infrared signals; the detection distance of the infrared detector is set, infrared rays, namely red laser, are emitted to the detected liquid level, infrared signals are reflected from the detected liquid level to the infrared sensing processor, and the infrared sensing processor calculates the distance from the detected liquid level to the laser emitting face according to feedback signals. When the height of the molten aluminum in the holding furnace reaches a normal value, the infrared sensing processor outputs a signal to control the non-return rod air cylinder to drive the non-return rod to descend so as to prevent the molten aluminum in the launder from flowing, and one-time molten aluminum supplement of the holding furnace is completed; and consequently, non-contact liquid level detection is formed, so that the height of molten aluminum in the furnace is kept constant. The device has the prominent substantive features of simple structure, prevention of abnormal pressurization of the casting machine in the casting process, low maintenance cost and the like.

Description

technical field [0001] The invention relates to a non-contact liquid level detection method and device for an aluminum liquid holding furnace. It is especially suitable for the liquid level detection of the aluminum liquid holding furnace of the low pressure casting machine. It belongs to the technical field of manufacturing equipment for automobiles and their accessories. Background technique [0002] In the prior art, the liquid level detection of the aluminum liquid holding furnace of the low-pressure casting machine is to install a detection rod (ceramic TB electrode) on the side of the sealed holding furnace, and the detection rod is in contact with the aluminum liquid in the furnace. An induction signal is generated, and the induction signal is transmitted to the control structure, and the control structure controls the opening or closing of the check bar of the aluminum liquid supply channel according to the induction signal, thereby realizing the control and managem...

AI Technical Summary

Problems solved by technology

[0003] One of the purposes of the present invention is to solve the problem of the liquid level detection of the contact type low-pressure casting machine aluminum holding furnace in the prior art. To deal with problems such as abnormal pressurization, short service life of rod parts and high maintenance costs, a non-contact liquid level detection method for aluminum liquid holding furnace is provided, which has the advantages of simple structure, prevention of abnormal pressurization and detection of casting machine during the casting process. Outstanding substantive features and significant progress such as long service life of parts and low maintenance cost

[0004] The second purpose of the present invention is to solve the problem of the liquid level detection of the contact type low-pressure casting machine aluminum liquid holding furnace in the prior art. To deal with problems such as abnormal pressurization, short service life of rod parts and high maintenance costs, a non-contact liquid level detection device for aluminum liquid holding furnace is provided, which has a simple structure, prevents abnormal pressurization of the casting machine during the casting process and detects Outstanding substantive features and significant progress such as long service life of parts and low maintenance cost

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