The importance of the calibration of the conveyor belt needle detector and the content of the calibr

The needle detector of the conveyor belt needle detector uses a permanent magnet, but the magnetism will gradually decrease after years of use. During the use of the needle detector, it is very important to correctly calibrate the needle detector, which is related to the accuracy of the needle detector, so the test sample for testing must be placed in the designated position for inspection before use. The calibration of the needle detector should mainly pay attention to the following points:

       ①The working power of the needle detector is normal: the power indicator light is on after the machine is turned on, the work indicator light is off when the needle detector is in standby, and the work indicator light is on when it is working;

       ②Conveyor belt transportation is normal: when the needle detector is started, the conveyor belt rotates normally, does not deviate, and has no abnormal sound;

       ③ Sensitivity of the needle detector: Put the standard test piece and the test piece of the needle detector into the induction frame, and cut in and move at a speed of 25m/min to carry out the test respectively. If two 1.0Fe (needle detector channel height 15CM) test pieces pass through the induction frame, and the needle detector makes a beeping sound, the sensitivity of the needle detector is qualified. If one of the test pieces passes through the induction frame, if the needle detector cannot make a correct response, the needle detector is unqualified, and it is necessary to find the cause, identify and eliminate the fault. The most common faults of the needle detector are: the conveyor belt is dusty or mixed with iron filings. The solution is to use a clean wet wool to wipe it. Note that the back of the conveyor belt is the place that needs to be wiped most, and the surface wiped is in the Not clean. Decreased sensitivity, demodulated with high sensitivity. For the specific adjustment method, please refer to the instruction manual of the needle detector.

       ④ When the calibration results meet the calibration requirements, the needle detector is qualified, and the permit is attached.

       ⑤The needle detector should be calibrated regularly. Usually, the calibration period is determined according to the quality of the needle detector and the control requirements for product needle detection. Generally, the calibration period is three months. In conjunction with a conveyor-type needle detector, the exact location of metal residues can often be confirmed using a hand-held portable needle detector. After a large needle detector is detected, the hand-held needle detector can help you accurately find the exact location of a steel needle or ferromagnetic metal in a small area. It can effectively and accurately detect the specific location of ferrous objects such as broken needles. For the detection of thin and small items, the needle detector can also be directly used for detection. When the clothing accessories cannot pass the needle detection, the hand-held portable needle detector has become an important "hand needle detection" device.