Features of weighing type filling and packaging machine
The weighing type filling and packaging machine is a filling and packaging machine that measures the product according to the predetermined weight and fills it into the packaging container, and has a wide range of applications. In automatic packaging machines, various kinds of loose materials with unstable bulk density and irregular blocks and branch-like objects are often weighed and measured. The accuracy of weighing measurement mainly depends on the accuracy of the weighing device. The measurement accuracy of a general weighing device can reach 0.1%. Therefore, the weighing method is often used for high-value items. The feeding device of the weighing type filling and packaging machine generally has a vibrating feeder and a screw feeder. Weighing type filling and packaging machines are divided into gross weight type filling and packaging machines and net type filling and packaging machines according to the weighing method. During the filling process, the gross weight filling machine weighs the product together with the packaging container, and stops feeding when the specified weight is reached. Since the weight of the packaging container directly affects the specified weight of the filling material, the measurement accuracy is not high. The net weight filling and packaging machine first weighs the material and then fills it into the packaging container. Because the weighing result is not affected by changes in the weight of the container, the weighing is accurate. Its working principle is to use a feeder to transport the material from the storage hopper to the weighing hopper, which is continuously measured by the scale. When the material in the weighing hopper reaches the specified weight, it is discharged through the hopper and enters the packaging container. Time and space materials can be completed by rotary feeders, belts, screw feeders and other methods, and controlled by mechanical scales or electronic scales to reach the specified weight. In order to improve the filling measurement accuracy and shorten the measurement time, the grading feeding method can be adopted, that is, most of the materials are fed at high speed, and the remaining small parts are fed in a small amount. In the case of computer control, the fine feed and coarse feed are weighed separately, recorded and controlled, and the weighing accuracy is high. For example, the accuracy of 500g material can reach ±0.5g. Net weight weighing is widely used in free-flowing solid materials that require high precision and metering. Such as milk powder, coffee and other solid beverages, it can also be used for puffed and fried foods. The weighing type filling and packaging machine is divided into intermittent weighing type filling and packaging machine according to the operation mode and filling and packaging machine which is continuously weighed and cut in equal parts. The former has high measurement accuracy and high speed, and is widely used in fast automatic packaging machines.
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