Introduction to the accuracy and error causes of automatic weighing machines
The manufacturer of the checkweigher machine tells you that when the package moves from point A to point B, the weight on the weighing platform reaches the weight trigger point. After the set invalid AD number, the instrument performs digital filtering on the collected AD number. When the AD number reaches the set value, it is averaged again to calculate the weight of the detected object. The instrument compares this weight with the set standard value to determine which zone the detected object belongs to and whether to reject it. When the detected object leaves the weighing platform, the automatic zero tracking starts to work until the next piece enters the weighing platform. The precision of an automatic weighing machine can be defined as: a single object is weighed several times on an automatic weighing machine, the standard error of its weight value (premise: average error u003d 0). The most important evaluation indicators for the accuracy of automatic weighing machines are the mean value and the standard deviation mean: the value obtained by dividing the sum of a set of data by the number of the set of data. Standard Deviation: A measure of the dispersion of the distribution of data, a measure of how far data values u200bu200bdeviate from the arithmetic mean. Usually, we define the dynamic accuracy of a checkweigher machine by ±3 times the standard deviation. For a given product, under certain testing conditions, the smaller the standard deviation value, the higher the dynamic accuracy of the equipment. . It needs to be clear that the dynamic accuracy must be the accuracy under the premise of a given product, a given detection condition and a given accuracy definition method. manufacturers tell you that the main factors affecting the accuracy of automatic weighing machines are: (1) product factors ① product category (such as appearance, solid or bottled liquid, etc.); ② product weight; ③ throughput (belt speed, weighing time, the length of the weighing table); ④ the stability of the product passing (heavy xin position, bottom surface flatness, surface reflectivity, etc.). (2) Environmental factors ① temperature, humidity, etc.; ② factors such as airflow, ground vibration, and belts scraping each other. (3) Human factors ① Inappropriate use and incorrect settings; ② Machine level, etc.
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