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Author: Smartweigh–Multihead Weighter
The multihead weigher (Loss-in-weightfeeder) is a kind of quantitative analysis weighing feeder equipment. From the main purpose, the multihead weigher is used for the whole process of dynamic continuous weighing, which can carry out the raw materials that must be continuously fed. Weighing and quantitative analysis operation, and there are instant total flow of raw materials and total total flow display information. Basically speaking, it is a static data weighing system, which adopts the weighing technology of the static data hopper scale, and uses the weighing sensor to weigh the hopper. However, in the control panel of the multihead weigher, it is necessary to calculate the net weight lost per unit time of the hopper scale to obtain the instantaneous total flow of raw materials.
Figure 1 is a plan view of the principle of the multihead weigher. The brief description of the multihead weigher, the design scheme, measurement and application of the main parameters of the operation and its application case. Figure 1. The principle plan of the multihead weigher. Figure 1 is a schematic diagram of the structure of a multihead weigher. Discharge, when the maximum material level is reached, the discharge valve is closed, and the weighing hopper is supported by a multihead weigher. In order to make the weighing accurate, the upper and lower sides of the weighing hopper are all connected according to the soft channel or the entrance and exit, so that the net weight of the front and rear, left and right machinery and equipment and the raw materials are not used on the weighing hopper.
The right side of Figure 1 is a plan view of the whole process of the continuous feeder. The whole process of the continuous feeder has a cycle system (three cycles are indicated on the figure). Each cycle system consists of two cycle times: when the weighing hopper is empty, the discharge valve is opened to discharge the material, and the net weight of the raw material in the weighing hopper continues to increase. When the maximum material level is reached at t1, the discharge valve is closed. The screw conveyor just started to pour the material, and then the multihead weigher started to work; after a period of time, when the net weight of the raw material in the weighing hopper continued to decrease and reached the minimum material level at t2, the discharge valve was opened again, and the period from t1 to t2 was the function Force feeder cycle time; after a period of time, when the net weight of the raw material in the weighing hopper continues to increase and reaches the maximum material level again at time t3, the discharge valve is closed, and the period from t2 to t3 is the cycle time for re-discharging , and so on. During the cycle time of the force feeder, the speed ratio of the screw conveyor is monitored according to the instantaneous flow rate to achieve a stable feeder; during the re-unloading cycle time, the speed ratio of the screw conveyor will keep the speed ratio just before the start of the cycle time. Change the feeder to the constant volume flow monitoring method.
Because the multihead weigher integrates dynamic weighing and static data weighing, and integrates interrupted feeder and continuous feeding, the structure is easy to seal, and it is suitable for weighing of ultra-fine raw materials such as concrete, quicklime powder, pulverized coal, food, medicine, etc. Weight and seasoning control, can achieve high weighing precision and linearity. 2. Necessity of the design scheme of the main parameters of the operation of the multihead weigher When designing the scheme of the multihead weigher, the main parameters of the operation such as the frequency of discharge, the volume of re-discharge, the capacity of the weighing hopper, and the rate of re-discharge must be considered, otherwise the multihead weigher will not work properly at work. A customer purchased a multihead weigher from the manufacturer for on-site equipment maintenance for feature analysis. Only 3 100kg weighing sensors were purchased. After being put into use, it was found that the zero point was unstable, and the total flow sometimes did not display information and other common faults.
Only after the manufacturer sent people to the site did they realize that the customer's raw material was boric acid, the relative density was 1510kg/m3, the maximum total flow was only 36kg/h, and the common total flow was 21~24kg/h. The total flow is so small, and the hopper uses three 100kg load cell support points.
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