Optical leather belt scale
A belt scale and visual technology, which is applied in the field of dynamic measurement of material quality on conveyor belts by visual belt scales, can solve the problems of low measurement accuracy, inapplicability and low accuracy, and achieve the effect of high measurement accuracy.
Inactive Publication Date: 2004-08-25
NAT INST OF METROLOGY CHINA
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Problems solved by technology
On the one hand, when the material accumulation shape changes greatly, this method cannot be measured because the CCD camera and the laser irradiation line cannot intersect on the upper contour line of the material; on the other hand, the position of the device to measure the lower contour line is far away from the conveyor belt. For two-end rollers, the lower contours of these positions are different when there is material and when there is no material. At the same time, it uses the cumulative method to calculate the accumulation volume, which is not continuous, so the measurement accuracy is not high.
In addition, the device uses the radioactive method (r-ray) to measure the density of materials. Its measurement principle is the same as that of the nuclear scale. The problems that the nuclear scale has as an online material weighing device also exist as a density measurement, such as low accuracy and calibration. cumbersome, safety, etc.
Therefore, the device is still not suitable for situations where the material density changes greatly and high precision is required or the material accumulation shape changes greatly.
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[0013] Such as figure 1 As shown, the visual belt scale of the present invention includes a light source 1, a light barrier 2, an automatic dust removal protective cover 4, a visual sensor 5 including a focusing lens 51 and a camera 52, a signal processing unit 6 including an acquisition card 61 and a computer 62, Speed sensor 7 and online density measuring device 8 . The visual sensor 5 and the automatic dust removal protective cover 4 are placed in front of the discharge port of the material conveyor belt, and the light source is used to shine on the conveyor belt. The light should cover the entire lens adjustment range. Next, the reflected light of the material under test 3 propagates to the lens 51, and the camera 52 outputs a video signal to the acquisition card 61 through the lens focusing. The conveyor belt speed signal detected by the speed sensor 7 and the material density signal measured by the online density measuring device 8 are also sent to the acquisition car...
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The invention discloses a visual belt balance, including a visual sensor to producing video signal, a shield to prevent the visual sensor from being polluted, a light source to provide a certain brightness for the visual sensor, a light barrier to eliminate the effect of background on the video signal, a speed sensor to measure the conveyor belt speed and a signal processing unit to receive and process video signal, speed signal and density signal and display various measuring and working states. It determines the mass of the on-line material by measuring cross-sectional area of the material on the conveyor belt, conveyor belt speed and material density, so the measuring precision is not influenced by inconstant feeding speed, material pile shape and large material density change, and it can be widely applied to industries such as electric power, chemical industry, mining and metallurgy, etc.
Description
technical field [0001] The invention relates to the technical field of online material quality measurement, in particular to a visual belt scale to dynamically measure the material quality on a conveyor belt. Background technique [0002] The methods for continuously measuring the mass of objects on the conveyor belt are currently widely used by the nuclear scale method and the electronic scale method. The nuclear scale method uses the attenuation law of the r-ray to penetrate the material, and obtains the average mass thickness of the material by measuring the attenuation of the r-ray through the material, and then calculates the weight of the material according to the calibrated coefficient. This method, on the one hand, Due to the physical scheme itself, the online dynamic measurement accuracy cannot be made high. On the other hand, the calibration is cumbersome, and the radioactive safety during use and the disposal after use are troublesome. The electronic scale method...
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IPC IPC(8): G01G11/00G01G21/00
Inventor 郑志受陆国强赵慧敏许英祖
Owner NAT INST OF METROLOGY CHINA