Large tonnage material level electronic scale and correcting method of weigh without counter poise
An electronic scale and large-tonnage technology, applied in the field of electronic scales, can solve the problems of increased difficulty in the design of the feed inlet, difficulties in installation and maintenance, and difficulty in measuring the correct material level.
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[0069] Example:
[0070] Examples of large tonnage electronic scales
[0071] like figure 1 , figure 2 As shown in the scale body structure of the material level electronic scale, the material silo 3 is directly placed on the load cell 1 by loading the supporting ear seat 5, and the position of the supporting ear seat 5 is required to be selected to a relatively high position, above the center of gravity of the material silo. . Because the size of the silo is relatively large, the present invention adopts four column-type load cells to form an electronic scale, so as to reduce the local pressure of the silo on the foundation. In the figure, 4 is the feeding mechanism, and 2 is the base.
[0072] like image 3 , Figure 4 As shown in the installation diagram of the load cell, the upper end of the load cell 1 is a spherical surface 11, which is connected to the indenter 7, and the lower part of the indenter is a concave spherical surface, the radius of the spherical surfa...
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[0103] Calculation example:
[0104] The rated input signal of the weighing instrument is 30mV (Vcfs), and the A / D conversion output value is required to be unified as 600,000 yards (M) at the factory, but because of the discreteness of components, the actual input signal A / D converter per millivolt The value is 20100 yards (C), the weighing instrument is calibrated for consistency when it leaves the factory, so that the output value when the rated input signal is 600,000 yards, and the factory correction coefficient is obtained according to formula (6).
[0105] DJNc=M / (Vifs×C)=600000 / (30×20100)=0.99502
[0106] The rated range of the material level electronic scale is 1000t (W), the weighing instrument displays 1000.0t when 1000t is loaded, then the Dfs is 10000, and 4 (n) load cells with a rated range of 500t (Wcfs) are selected, and the sensor output sensitivity They are 1.512mV / V(S1), 1.514mV / V(S2), 1.493mV / V(S3), 1.498mV / V(S4) respectively, and the sensor excitation vol...
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