Particle material fixed-weight packaging scale

The principle of a quantitative packaging scale is as follows: a quantitative packaging scale generally consists of several components: a weighing hopper, a feeding mechanism, and a control computer, etc. To achieve automation or mechanization of the operation, quantitative packaging scales also have some auxiliary facilities, such as bag clamping mechanisms, discharge devices, bag-pushing devices, air pumps, etc. Most of these facilities are driven by cylinders. Due to the commercial nature of the trade, the country requires a precision of at least level III, so quantitative packaging scales mostly adopt the static weighing method, that is, the materials are relatively stationary during weighing and intermittent weighing. In cotton seed factories and flour mills, the common method of weighing is the double hopper method, that is, there are two hoppers (shelves) on the scale, used for temporarily storing and weighing. When a working cycle begins, the materials are sent from the temporary storage hopper to the weighing hopper. When the weighing hopper is weighing, the feeding is stopped, and the materials are temporarily stored in the temporary storage hopper. When the weighing hopper has completed discharging, the temporary storage hopper is reopened to complete the next working cycle. The way of adding materials from the temporary storage hopper to the weighing hopper is mostly the dual logistics method. In dual logistics weighing, it is understood that two different material flows are used to add materials to the weighing hopper. First, a large flow of materials is used for rapid rough addition, and when the set value is reached, it switches to a small flow, and finally accurately adds the materials to the set weight. Commonly, two or more different-sized or differently-rotating chutes are used to complete the feeding. These actions are all completed by the built-in control computer uPC according to the set program.