A metal separator is a device that separates metal and non-metal, which can quickly identify and separate metal impurities of ≥0.3 mm. The accuracy and reliability of the metal separator depends on the stability of the electromagnetic transmitter frequency, which is generally used from 80to800kHz operating frequency. The lower the operating frequency, the better the iron detection function; The higher the frequency of operation, the better the detection function of high carbon steel. The sensitivity of the detector decreases with the increase of the detection scale, and the size of the induced signal depends on the size of the metal particle and the conduction function.
The metal separator mainly uses the principle of electromagnetic conversion, when the current through the coil will produce a magnetic field, and then through the microprocessor to compare the current changes before and after, to get whether there is metal through, according to the application of DSP technology can soon be sorted out whether there is metal through and non-metal through. Metal separators are widely used in food industry, pharmaceutical industry, drugs and capsules for fine powder products; Test seasonings, additives or powdered raw materials before they are processed to protect subsequent equipment; Fine powder products such as herbs, tea, milk powder and chemical additives are tested for their quality.
Design advantages of metal separator:
1, the introduction of German core technology, using the principle of electromagnetic induction, used to detect and automatically separate metal impurities such as iron, copper, aluminum in plastic raw materials or recycled materials.
2, the fuselage using paint process, beautiful appearance, lasting color, waterproof and rust.
3, compact size and structure design, small volume, small occupation area.
Working principle of metal separator:
Raw materials from the hopper or feeder free fall through the metal separator, if there is no metal impurities, raw materials will directly through the metal separator induction area straight down the storage bucket, if the detector detects metal in the raw materials, then the diverter valve will act, with metal and a small part of the raw materials out, and then the diverter plate quickly returned to the normal position, the diverter plate speed is adjustable, The induction precision is adjustable according to production needs, and even metal particles as small as 0.3 mm can be detected and separated.
After the customer purchased the metal separator, the plastic particles were screened, and the metal impurities such as iron, aluminum and copper were effectively removed, even the fine wire could be removed. After a period of use, the workshop production efficiency and product pass rate have been significantly improved, and there is no longer damage to the screw, blocking the nozzle, hot runner and so on.
Metal separators are used to fit the goods being tested. Generally speaking, the detection scale is controlled at the minimum value as far as possible, and the detector channel size should match the commodity size for high frequency induction goods. The adjustment of the detection activity should refer to the middle of the detection coil to determine that the middle orientation has the lowest induction. The detected value of the product will change with the change of production conditions, such as the change of temperature, commodity scale, humidity, etc., which can be adjusted by the control function. Spheroids are repeatable, have the smallest surface area, and are the most difficult for metal separators to detect. Thus, spheroids can be used as reference samples for testing activity. For non-spherical metals, the detection activity depends largely on the orientation of the metal, and different directions have different cross-sectional areas, and the detection effect is not the same. For example, the longitudinal passage period, the iron contrast is active; High carbon steel and non-iron are less active.
The above is the introduction of the metal separator can be accurately detected, the metal separator as an efficient removal of metal impurities equipment, simple operation, flexible installation, in addition to the injection molding industry, in food, medicine, cement, chemical, paper and other industries are also applicable, is the enterprise to improve production efficiency, reduce costs of "good helper". The sensitivity of the detector decreases with the increase of the detection range, and the size of the induced signal depends on the size of the metal particle and the conductivity. Due to the current pulsation and current filtering, the metal detector has a certain limit on the transmission speed of the detected items. If the transmission speed exceeds a reasonable range, the sensitivity of the detector will decrease. In order to ensure that the sensitivity does not decrease, the appropriate metal detector must be selected to adapt to the corresponding product being tested.