The weight-for-weight is the main indicator in the quality standards for wheat acquisition and transportation, and it is also an important basis for measuring the quality of other cereals. Although the size of Rongyun is currently determined in accordance with G B5498-85, H GT iooo~container cranes have been used for measurement. However, due to the different production durations, different lengths of time, and different maintenance of each unit, they will all The difference in the sensitivity between the components of the instrument (specialty fulcrums and key cutting tools) is different. Therefore, although the inspectors can skillfully operate according to the standard method for the same sample, the data measured by each of the load-bearing units varies. According to the situation in recent years in our city for the use of more than 40 sets of load-bearing devices by various factories and factories, the error generated by each of the load-bearing vessels is as low as 2 to 3 g/L, which is more than 10 g/L, which affects not only The implementation of the price of grain grain for acquisition and transfer, and more importantly, it directly influences the wheat's grade index in the provincial allocation process, causing unnecessary disputes in transport and transportation, and causing economic losses for grain companies. Therefore, the calibration of the container is an important task in the grain and oil inspection. To this end, the city can annually prepare the plant and the used load receptors before the summer squatters are put into storage. Each year, 20 million kilograms of wheat are transferred from other provinces, and no quality dispute occurs due to inconsistent weight tolerance. The tolerances of the wheat that were brought up were all within 3 g/L of Fangu. The specific practices are as follows:
First of all, the registration number of each unit's container weight is required to be dedicated to each unit's equipment. Each part must not be mixed with each other to avoid causing errors. Before installation, the parts should be cleaned with gauze, brush, etc., and they must be clean and free of dust and dust. The key components such as fulcrum knives, key knives, onyx fulcrum knives, and key knives are brushed and lightly wiped to prevent knife edges. For those who do not use rust for a long period of time, first wipe the cotton paste toothpaste with a toothpaste and then apply a layer of sewing machine oil. After all instruments are installed, zero calibration is performed and then corrected in two parts.
The first is the calibration of the instrument measurement system. The method is to add a certain quality of four-level standard weights in the simplified capacity, corresponding to the size of the moving hammer on the scale, compared with the data on the scale scale, the new instrument has been calibrated accurately before leaving the factory, just check this H can be used, but there are also deviations due to long-term use or poorly maintained instruments. This is mainly due to the lead blocks in the large and small hammers caused by leakage or artificial addition of lead blocks. The method of calibration is to add or less lead blocks in the big and small hammers until the standard weight and scale are placed in the capacity cylinder. The number reflected is the most equivalent.
The second is to correct the instrument's measurement error (capacity). At this time, the wheat sample was directly measured. The method is to select the same sample (with a volumetric capacity of 759-760 g/liter) and use the standard load cell (or calibrated container) and the sizing device to alternately measure each other 10 times and measure the data 10 times. The averages were averaged separately. The difference between the two averages was printed as the bulk density error measured by the school's instrument and the standard instrument. (In the measurement process, the operation method of G B5498-85 must be strictly followed. The correct data should be removed and re-measured once. It means that the static weight measured by the school instrument is lower than (or higher than) the standard result × g/L, and the actual value should be added (or subtracted) × g/L.
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