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What is a treasure trove and why is it so popular?


Release time:

2021-09-09

The treasure detector is a metal detection device, which is composed of a metal detector and an automatic rejection device, and the detector is the core component. The system can use the alarm signal to drive the automatic rejection device, etc., to exclude metal impurities on the production line. Three sets of coils are distributed inside the treasure detector, namely the central transmitting coil and two equivalent receiving coils. The oscillator connected to the middle transmitting coil generates a high-frequency variable magnetic field. In the idle state, the induced voltages of the receiving coils on both sides cancel each other before the magnetic field is disturbed, reaching an equilibrium state.

treasure detectorIt is a metal detection device, consisting of a metal detector and an automatic rejection device, in which the detector is the core component. The system can use the alarm signal to drive the automatic rejection device, etc., to exclude metal impurities on the production line. Three sets of coils are distributed inside the treasure detector, namely the central transmitting coil and two equivalent receiving coils. The oscillator connected to the middle transmitting coil generates a high-frequency variable magnetic field. In the idle state, the induced voltages of the receiving coils on both sides cancel each other before the magnetic field is disturbed, reaching an equilibrium state.

Once metal impurities enter the magnetic field and the magnetic field is disturbed, this balance will be broken, and the induced voltages of the two receiving coils cannot be offset. The uneliminated induced voltage is amplified by the control system to generate an alarm signal (metal impurities are detected). The system can use the alarm signal to drive the automatic rejection device, etc., to exclude metal impurities on the production line.

treasure detectorThe components used are constantly updated and developed from electronic tubes, transistors and even integrated circuits, and their application scope has been extended to almost all fields, playing an important role in industrial production and personal safety.

The accuracy and reliability of metal detectors depend on the stability of electromagnetic frequency, and the working frequency of 80~800 kHz is generally used. The lower the working frequency, the better the detection performance of iron; the higher the working frequency of treasure detector, the better the detection performance of high carbon steel. The sensitivity of the detector decreases as the detection range increases, and the magnitude of the induced signal depends on the size and conductivity of the metal particles.

Due to the current pulsation and current filtering, the treasure detector has certain restrictions on the conveying speed of the detected items. If the conveying speed exceeds a reasonable range, the sensitivity of the detector will decrease. In order to ensure that the sensitivity is not reduced, the appropriate metal detector is selected to adapt to the corresponding tested product. In general, the detection range should be as small as possible. For products with good high-frequency inductance, the size of the detector channel should match the product size. The adjustment of detection sensitivity should be determined with reference to the center of the detection coil, and the center position has low induction. The detection value of the product will change with the change of production conditions, such as changes in temperature, product size, humidity, etc., which can be adjusted and compensated by the control function.

 

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