How to set the upper and lower limits of the online dynamic checkweigher?
The dynamic weighing characteristics of the checkweigher conform to the normal distribution curve. The same product will have different values u200bu200bwhen measured multiple times. These values u200bu200bwill be distributed in the interval of this normal distribution curve. Therefore, in the elimination of the checkweigher machine setting If the lower limit is smaller than the upper and lower limits required by the user, these values u200bu200bwill be distributed in the normal distribution interval, so the upper and lower limits set by the checkweigher machine are smaller than the upper and lower limits requested by the user. . 1. General setting method. Add or subtract 3 times the standard deviation within the nominal weight range of the product, that is, the upper and lower limits and the upper and lower limits. The error rate of this setting method is 0.3%. Others will include a range of nonconforming products with a standard deviation of 6 times. This setting allows most qualified products to pass through, ensuring the continuity of production, but unqualified products may enter the qualified range (depending on the critical point position of unqualified products). 2. Satisfy 100% without rejecting qualified products. Then, the standard deviation of 3 times needs to be enlarged to the standard deviation of 4-6 times. Although this setting can satisfy 100% of qualified products, but there will be more unqualified products into the qualified range. 3. Reach 100% rejection of substandard products. To meet this requirement, it is necessary to add 4-6 times the standard deviation of the heaviest ultra-light unqualified products as the lower limit of qualified products, and subtract 4-6 times the standard from the lightest product of overweight unqualified products. The difference is the upper limit of the qualified product. If the user's product distribution range is more concentrated near the mean range, qualified products will be less likely to be mistakenly rejected, and it can be guaranteed that the unqualified range will be 100% rejected. 4. Ideal situation. The chart below is the ideal state of interval setting, which is related to the uniformity of the user's product, and the application of the customer's request to exclude non-conforming products. In this way, 100% of unqualified products can be eliminated, and 100% of qualified products can be passed. In short, according to the specific requirements of customers and the requirements of weighing accuracy, the upper and lower limits of the weight scale are set. Zhongshan Shigan is a professional checkweighing machine manufacturer with many years of experience in weighing instrument manufacturing. The products are sold at home and abroad. We tailor-made online checkweighing machine solutions for online checkweighing production lines for you. Please feel free to contact us for more details!
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