How to test the checkweigher
How to test the checkweigher: The checkweigher is a very key equipment on the automated production line. It has high precision, fast speed, and can save the weight of a single product and the total weight of each batch of products. However, the checkweigher is used In the process, if you want the batch of products to be able to reach the measurement, then the accuracy test of the checkweigher needs to be carried out, then how to carry out the correct test? The editor below has collected two test methods for you, hoping to help you. This test is to pass the same product through the checkweigher machine 10 or 20 times to ensure that the direction of the product and your direction in actual production each time it passes. 1. Record each data. There are some checkweighers that can automatically record and calculate the standard deviation. If the checkweigher cannot be calculated automatically, you can use the STDEV formula in the Excel table to calculate. 2. After having the standard deviation, multiply it by 6 to get the uncertainty interval (the calculation method of the uncertainty of the global dynamic checkweighing). 3. Retrieve TNE(-T1) in the table below. For example, if your product weight is 200 g, then TNE(-T1) is 5% or 9g. 4. Now calculate a quarter of this 9g, which is also 0.25 x 9g u003d 2.25g. This value is your repeatability limit. 5. If the uncertainty interval you calculated at first is greater than 2.25 g, then this checkweigher is not available under this setting. Different types and weights of products that are checked on the checkweigher machine need to pass this test. If you want to do better, repeat this test every once in a while, record and analyze the trend of each test, and see how the test results change over time. Based on this trend, you can determine how often you need to perform such a test. These records and trend analysis are also proof of the property insurance risk assessment by users of checkweighers. The second test is also carried out using the tested product. In addition, a calibrated static scale is also required. The resolution of the static scale needs to be the same as that of the checkweigher, or higher. This inspection needs to be performed before, after, and at the end of a batch. Similarly, this test can be used for trend analysis for further risk assessment. 1. Use an adjustment weight similar to the product to check whether the static scale can be weighed correctly. 2. Pass the product through the running checkweigher, and then place it on the static scale for weighing. Compare the weight value obtained on the checkweigher with the weight value obtained on the static scale. If the difference is greater than 1/5 of TNE, this checkweigher is no longer applicable. During the batch process, some checkweighers have a built-in weight check function to eliminate the product used for testing, and display its weight on the screen constantly for testing. 3. At least repeat this test to check the repeatability of the checkweigher. For example, if the rated weight of our product is 200 g, the weight displayed on the checkweigher is 200.4 g, and the same product is taken to the static scale, and the weighing display is 199.7 g. The difference is 0.7 g. We know that the TNE of a 200 g product is 9 g. One fifth is 1.8 g. 0.7g is less than the limit of 1.8g, and the checkweigher can measure it and use it normally. If you want to make the batch of products meet the standard, you need to perform the above two tests, and write these two tests into your standard workflow. After a period of time, repeat these two tests. As long as you pass the test, you can use this checkweigher with peace of mind.
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