During the online metal foreign object detection process using food metal detection machines, it is difficult for production enterprises to avoid various problems. Some problems can be quite challenging, leading to longer downtime. In order to facilitate rapid identification of problems, we will make a summary of the problems for your reference.
1. Power failure
The voltage of the circuit that provides power for the food metal detection machine is unstable, fluctuates greatly, and exceeds the allowable range. This situation can introduce noise into the machine and cause interference to the detection head. If the machine is being tested, it will cause false alarms and other problems, causing the system to malfunction in the removal device. In severe cases, it will cause the system to crash, and in the long run, it will cause damage to the hardware circuit of the metal detection system, affecting the service life of the machine.
Solution
In this situation, we strongly recommend that users install an independent AC stabilized power supply to power the metal detection machine. This can ensure that the power supply provided to the detection machine is pure, ensuring stable operation of the machine, avoiding false alarms, and extending its service life.
2. Electromagnetic wave radiation interference fault
Due to the installation of food digital metal detection machines on automated assembly lines, there are many processing equipment and other detection equipment around them. If there are certain electrical devices in these equipment, electromagnetic wave radiation and electrification noise will be generated, which will have a very adverse impact on their detection performance. We know that metal detection machines use the principle of magnetic induction to detect metals through changes in magnetic fields, The surrounding magnetic field will inevitably affect this magnetic field, resulting in changes, leading to false alarms and false actions.
Solution
In this case, it is necessary to check the surrounding equipment and try to keep the equipment that generates electromagnetic waves away from the metal detector. If these equipment are not easy to move or cannot move, it should be considered to arrange the metal detector to another location.
3. Faults caused by large metal movement
Due to the fact that conveyor belt metal detectors are highly sensitive devices for detecting metals, large metal objects often enter or move nearby (such as trailers, elevating vehicles, inkjet printers, etc.), which can also lead to false alarms and malfunctions of the machine.
Solution
Ensure that these large metal objects are kept away, such as trailers and elevating vehicles, which can be bypassed while driving. For example, if the printing head of a coding machine is used, a conveyor can be added in front to keep it away from the detector.
4. Faults introduced by nearby frequency converters and transmission devices
Shared with large frequency converters and variable speed devices, the frequency converter and variable speed device use the principle of frequency conversion, and will feed back the frequency conversion signal to the power line during operation. The introduction of these signals into the power supply of the metal detection machine can cause issues such as false alarms.
Solution
At this point, an independent power supply line should be provided for the metal detection machine, and ensure that the power supply cables of large frequency converters and variable speed devices are kept away from the power supply cables of the food metal detection machine.
5. Product effect failure
Sometimes the product to be tested has sufficient moisture and high salt content, and this type of product will generate a significant signal similar to metal, namely product effect, at present, many metal detection machines have poor product effect suppression ability, leading to machine malfunctions and even inability to work properly when detecting these products.
Solution
At this point, it is necessary to switch to a new type of food metal detection machine, which has good product adaptability, strong automatic product effect cancellation ability, high detection accuracy, and good stability.
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