deux méthodes d'essai de précision pour la balance de contrôle

2020-07-18 15:45:27
Check weighing scale(also called checkweigher,weighing scale and sorting machine) is a key equipment, automatic production line is very it has high precision, high speed, can save a single product weight and total weight per batch products, and other functions, but in the use of inspection in the process of weighing scales, want to ensure that every batch of products can achieve accurate measurement, it needs to check to test the accuracy of weighing scales, and precise test that how to correct?The following small series of Shanghai practical for you to collect two test methods, I hope to help you.SG-150 6 已 抠 .jpgThe first test is to pass the same product 10 or 20 times, making sure that each pass is in the same direction as you would in production.1. Record each data. Some check scales can automatically record and calculate standard deviation.If the balance cannot be calculated automatically, it can be calculated using the STDEV formula in Excel.2. After the standard deviation, multiply by 6 to obtain the unconfidence interval (a calculation method for the uncertainty of dynamic weight detection globally accepted).3. Retrieve the TNE(-T1) in the table below. For example, if your product weighs 200 grams, the TNE(-T1) is 5% or 9g.4. Now calculate a quarter of this 9g, which is 0.25 x 9g = 2.25g.This is your limit for repeatability.5. If your initial unconfidence interval is greater than 2.25g, then the weigher is not available under this setting.This test is required for all different types and weights of products to be checked on the weigher.To do this better, repeat the test every once in a while, recording and analyzing trends for each test to see how the results change over time.Based on this trend, you can determine how often you need to run the test.These records, along with trend analysis, are also valid evidence of the property risk assessment of the weigher users.
The second test is also carried out using the product under test. In addition, a calibrated static balance is also needed.The resolution of the static balance should be the same as that of the check weigher, or higher.This inspection is required before, after, and at the end of a batch.Again, this test can do trend analysis for further risk assessment.1. Use correction weights of similar weight to the product to check whether the static scale can be weighed correctly.2. Pass the running check weigher, and then put it on the static scale for weighing.Compare the weight value on the checking scale with that on the static scale.If the difference is greater than 1/5 of the TNE, this check weigher is not applicable.When the batch is in progress, some checkweighers have a built-in weight check function, which removes the product for testing only and displays the weight on the screen at a constant rate for testing purposes.3. Repeat this test at least once to check the repeatability of the weigher.Par exemple, si notre produit a un poids nominal de 200 g, le poids approuvé sur la balance est de 200,4 g, le même produit est mis sur la balance statique et le pesage indique 199,7 g, la différence est de 0,7 gramme. Le TNE d'un produit de 200 g est de 9 g, un sur cinq est de 1,8 gramme. Lorsque 0,7 g est inférieur à 1,8 g, la peseuse de contrôle peut être mesurée avec précision et utilisée normalement.Pour que chaque lot de tests de produits soit précis, vous devez exécuter ces deux tests et les écrire dans votre flux de travail standard.Répétez les deux tests après un certain temps et une fois que vous avez réussi les tests, vous pouvez utiliser la peseuse en toute sécurité.

J'espère que ces deux méthodes peuvent vous apporter de l'aide, si vous souhaitez toujours comprendre le contenu, n'hésitez pas à cliquer ici pour consulter !

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