Method and device for detecting material level in material bin

Abstract

The invention relates to a method and device for detecting the material level in a material bin. The device is characterized in that a measuring cable is arranged at the central axis of the circular metal material bin and is parallel with and insulated from the metal bin wall, the measuring cable and the metal bin wall form a parallel plate capacitor, and the capacitance of the parallel plate capacitor is the total capacitance CX of a material bin capacitive sensor; an electronic oscillating circuit is used to form a primary instrument, an RS-485 bus differential drive function is used to transmit a pulse sequence signal between the primary instrument and a secondary instrument, the change of the CX is converted into the corresponding pulse sequence signal and remotely transmitted to the secondary instrument, and the second instrument measures the cycle T of the pulse sequence signal; the material level L1 is obtained. The device is simple in overall structure, easy to implement, fast in detection, high in accuracy, simple to mount, low in cost, convenient for a user to use, free of a mechanical moving device, small in primary instrument size, light, and long in service life.

Description

technical field [0001] The invention relates to the field of material storage, in particular to a method and device for detecting the height of a material level in a material bin. Background technique [0002] In industrial and agricultural production activities, material storage bins are used in many cases, such as various liquid or solid material bins in the chemical industry, crude oil storage bins in oil extraction plants, and bulk cement storage bins in the concrete production process. These materials are solid, powder, liquid, conductive and non-conductive. In the production process, people want to know the amount of material in the material bin at any time. The simplest and easiest way is to be able to detect the height of the material level in the material bin at any time. The previous level detection instruments include contact type, ultrasonic type, heavy hammer type, floating ball type and so on. The disadvantage of the contact level gauge is that it cannot dete...

AI Technical Summary

Problems solved by technology

The disadvantage of the contact level gauge is that it cannot detect continuous material level; although the ultrasonic level gauge can continuously detect the material level, its detection accuracy is affected by the shape of the top surface of the material in the material bin, and the foam on the liquid surface will also affect it. to its detection accuracy; the hammer type level gauge is only suitable for measuring the height of solid material level, and has the disadvantages of mechanical movement device, complex structure, high operating noise, and high energy consumption; the float type level gauge is only suitable for measuring liquid level height

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