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In the processing production line, the checkweigher achieves the requirements of sub-inspection accuracy through the principle of weight control. If the checkweigher has an error, it will not be able to meet the accuracy requirements of the sub-inspection, which will seriously affect the pass rate of automatic production. Then we have to analyze the causes and corresponding solutions at this time.
Observe whether the measured object has changed
Generally, the physical characteristics of the measured object may affect the accurate weight of the checkweighing. For example, if the length, width, and height of the measured object change, the position of the center of gravity after automatic weighing will be different, and the change of the center of gravity exceeds the checkweighing table. The tolerance range will definitely cause deviations in the inspection results. Therefore, the measured objects of different "specifications", especially the varieties that will bring deviation, should be set independently when setting the checkweighing parameters (recipe).
Check whether the checkweigher is too fast
For the same object to be checked, the faster it runs on the checkweigher conveyor, the lower the checkweighing accuracy will be. Therefore, setting an appropriate running speed can effectively improve the stability and checkweighing accuracy of the system.
See if there is any airflow effect on the production line
Checkweighers are often the first level of accuracy, and airflow disturbances caused by fans, air conditioners, and ventilators will affect the checkweighers. It is a good way to install a windshield for the checkweighing and testing organization or to turn off the fan at the checkweighing and testing machine.
Check whether the checkweigher is placed smoothly and whether there is a large mechanical vibration in the surrounding environment
The checkweigher must be stable when it is running, otherwise, it will seriously affect the accuracy of the checkweigh test. Therefore, when installing the checkweigher, we must use a level to make repeated adjustments to ensure that the scale is stable. During operation, whether there are large mechanical vibrations around will also affect the accuracy of the checkweighing. Although our measurement system has done a good software and hardware treatment, it can effectively filter out part of the impact of vibration, but the installation environment of the checkweigher It is still necessary to avoid "vibration sources" as much as possible.
See if the equipment usage environment exceeds the allowable range
Whether the temperature, humidity, and electricity environment meet the standards (these indicators are usually not easy to detect) are also some of the reasons for the inaccurate checkweighing results. In the final analysis, it is the influence of the environment that causes the equipment to fail to operate normally, causing the checkweighing results to be inaccurate.
Check whether the checkweigher is used in over-range
Each checkweigher machine has its own section of checkweighing range. If this range is exceeded, the accuracy of the checkweighing will be insufficient, and if the checkweigher machine is heavy, the internal sensor components of the checkweigher will be damaged. Therefore, when using the checkweigher, be sure to clarify the weighing range of the checkweigher so that the checkweigher can work within a suitable range.
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