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Metal detector for belt conveyer

A technology of metal detectors and belt conveyors, which is applied to instruments, measuring devices, scientific instruments, etc., and can solve problems such as metal detector misoperations

Active Publication Date: 2013-04-10
LONGI MAGNET CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Problem 2: When transporting ore with high magnetic permeability, the metal detector malfunctions due to changes in the transport volume

Method used

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  • Metal detector for belt conveyer

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Embodiment Construction

[0012] The present invention has two sensors L1, L2, and sensor L1 is enclosed within on the belt, and sensor L2 is placed on the conveying belt lower side, and sensor L1 and sensor L2 have respective oscillator, high-amplification, wave detection, low-amplification circuits. The output end of the sensor L1 amplifying channel passes through the diodes D21 and D22 to form a positive and negative phase detection circuit, and divides the detected signal into two channels. The channel of the diode D21 (metal reaction channel) is sent to the amplifier IC8, and the output of the amplifier IC8 is sent to the amplifier IC10; The D22 channel (ore reaction channel) is sent to the amplifier IC9, the output of the amplifier IC9 controls the gate of the field effect transistor V9, and the output of the field effect transistor V9 and the resistor R30 divides the voltage to control the input voltage of the amplifier IC10. For ore materials with high magnetic permeability, the eddy current eff...

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Abstract

A metal detector for a belt conveyer applied to the fields of coal, metallurgy, electricity, mine and the like comprises sensors, an oscillator, a high amplification circuit, a detection circuit, a low amplification circuit and an actuator. Two sensors L1 and L2 are arranged. The sensor L1 is sleeved on a belt, and the sensor L2 is placed below a conveying belt. A signal of the sensor L1 passes through an amplification channel and then enters a positive and negative phase detection circuit consisting of diodes D21 and D22. The detected signal is divided into two paths and then respectively enters amplifiers IC8 and IC9. The amplifier IC8 outputs the signal to an amplifier IC10 to drive the actuator. The amplifier IC9 outputs the signal to control the grid of a field effect tube V9. The field effect tube V9 and a resistor R30 which divide the voltage output the voltage to control the input voltage of the amplifier IC10. A signal of the sensor L2 passes through an amplification channel and then is outputted through an amplifier IC11 to drive a field effect tube V10. The field effect tube V10 and the resistor R30, which divide the voltage, control the input voltage of the amplifier IC10. The metal detector avoids the interference caused by reinforcing a wire connector in the conveying belt and the interference due to variation of magnetic inductivity in the process of conveying ore materials.

Description

(1) Technical field [0001] The invention relates to a metal detection device used in industries such as coal, electric power, metallurgy and mining, cement, chemical industry, etc., especially a metal detection device for detecting harmful metals in the process of conveying materials on a conveyor belt. (2) Background technology [0002] The metal detection devices used on belt conveyors in coal, electric power, metallurgical mining, cement, chemical and other industries all use eddy current induction technology. When the metal passes through the sensor coil, the eddy current effect changes the high-frequency oscillating current flowing in the coil, and the signal formed by this change can be amplified and compared to show the presence of the metal. [0003] The sensor in the metal detection device is the L part of an LC oscillator. In practice, it is a single-turn or multi-turn inductance coil, which is made into a square frame shape and placed on the conveyor belt. The o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10G01V3/11
Inventor 张承臣吕凤钧樊明元邵贵成
Owner LONGI MAGNET CO LTD
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