Quantitative package scale and weighing method

Abstract

The invention belongs to a quantitative package scale and a weighing method. The quantitative package scale comprises a material bin and a scale bucket. A quantitative discharging unit is arranged between the material bin and the scale bucket. The quantitative discharging unit comprises a volume changeable type quantitative discharging bin unit and a compensating type quantitative discharging binunit. The volume changeable type quantitative discharging bin unit and the compensating type quantitative discharging bin unit are arranged between the material bin and the scale bucket side by side.A shell is arranged on the outer side between the material bin and the scale bucket. The scale bucket is provided with a weighing sensor. A bottom discharging opening of the scale bucket is provided with a discharging baffle provided with an air cylinder. The shell is provided with a control unit for controlling the volume changeable type quantitative discharging bin unit and the compensating typequantitative discharging bin unit. The quantitative package scale has the advantages that the structure is simple, design is reasonable, operation is convenient, the package scale is applicable to particular materials, and the problem that the difference between the actual weight and the rated weight is too large can be solved effectively.

Description

technical field [0001] The invention belongs to the technical field of packaging scales, and in particular relates to a quantitative packaging scale and a weighing method suitable for granular materials. Background technique [0002] The existing packaging is suitable for quantitative packaging of materials with good fluidity. It is widely used in grain, feed, food, light industry, chemical industry and other industries. It is composed of a mechanical device and a control box. The mechanical structure includes a discharge mechanism, Scale mechanism, entrainment mechanism, conveying mechanism, sewing mechanism and other parts, the control system includes load cells, meters, touch screen and other equipment. The packaging scales normally used in the market are all equipped with a weighing sensor on the weighing hopper, and the material is weighed after entering the weighing hopper. When the weight reaches the rated weight, the feeding valve is closed to carry out the subsequen...

AI Technical Summary

Problems solved by technology

The packaging scales normally used in the market are all equipped with a weighing sensor on the weighing hopper, and the material is weighed after entering the weighing hopper. When the weight reaches the rated weight, the feeding valve is closed to carry out the subsequent sewing process; the above needs to ensure the following points Only in this way can the actual weight in the packaging bag be close to the rated weight. 1. The flow rate of the material is relatively slow and must be uniform. When the material flow rate is uneven, the actual weight will be far less than the rated weight when the feeding valve is closed too early. The actual weight is far greater than the rated weight when the feeding valve is closed too late; 2. When the flow rate of the material is guaranteed to be uniform, especially when the flow rate is fast, it must be operated by experienced operators, otherwise the above problems will also occur , which means higher requirements for the experience of the operator; 3. When the weight displayed by the weighing bucket is equal to the rated weight, close the discharge valve, but the material at the lower part of the discharge valve that has not fallen into the weighing bucket is still in the process of falling. After this part of the material enters the weighing hopper, it is still easy to cause the defect that the actual weight is greater than the rated weight; in order to overcome the above defects, some companies have introduced compensation hoppers, which usually use vibration feeding or screw conveyors for feeding, not only itself The speed is slow and inaccurate; the operation process is: large warehouse feeding, when the actual weight is close to the rated weight, the compensation hopper is used to compensate. The above method can make the actual weight and the rated weight closer, but it still cannot solve the problem. At the same time, the introduction of the compensation hopper reduces the weighing and packaging efficiency of materials (the inefficiency of this method is reflected in the slow speed of the compensation method, and the large warehouse cannot feed materials when the compensation hopper is working, etc.)

Images