IMS_EdgeDrop测量仪_简介.doc

SystemtechnikKaltShort DescriptionShort DescriptionEdge-Drop GaugeJ. BuschIMS Messsysteme GmbHDieselstrae 5542579 HeiligenhausTel.: +49 (0) 2056 / 975 - 0Fax: +49 (0) 2056 / 975 - 140Contents1Edgedrop-Measurement31.1Technical Description31.1.1Calculation of the wedge, crown and edge drop values52Typical Data of an Edgedrop Gauge for Tin Plate62.1Typical Gauge Data62.2Technical and Performance Data of the Centerline Head72.3Technical and Performance Data of the Edge Heads7 1 Edgedrop-Measurement1.1 Technical DescriptionThe following technical specification describes an edgedrop gauging system providing continual, non-contact thickness measurement of steel. The system provides strip thickness measurement in centerline as well as continues measurement of the strip edge profiles.The edgedrop gauge consists essentially of one C-frame containing 3 measuring heads -2 edge measuring heads and 1 centerline measuring head-. Each of the 2 edge measuring heads contains 15-30 detectors, the centre head contains 2-4 detectors. As detectors ionization chambers are exclusively used. The number of detectors depends on the customer requirements and also on the minimum and maximum strip width. Applications with more detectors are possible.X-ray radiation is emitted from the x-ray tubes of the 3 source heads. The radiation beam collimation in front of each detector is designed to avoid any cross-interference between adjacent measuring channels. The measuring geometry, including the measuring slit, can be seen in the attached drawings. The width of each edge-measuring channel (at the passline) depends on the application, and may typically be 4 or 5mm.The width and strip position are determined from the measuring signals from the channels in the strip edge area. For this purpose each measuring head moves individually. The complete C-frame is fixed with an release latch in the measuring position (mill centerline), so that always a reproducible position is guaranteed.The edge measuring heads automatically take up their respective positions depending on the width of the strip, at changes of the set width the heads take a preposition.The detectors in the edge measuring heads are arranged so that the outer measuring channel always sees no strip. The next channel in looking towards the centre of the mill is used as a strip edge position detector. If the strip should shift sideways the parameter ”Automatic edge detection” is switched on, and the measuring head drives automatically to track the strip edge. The measuring head drives until 2nd ionization chamber is fully covered with strip.In the emergency mode -that means failure of the centerline head- the operator side edge head moves to its end position of the drive side. After this the complete C-frame moves to the drive side until the operator edge head is in strip centerline position. The measuring signals of four adjacent detectors will be summarized to one thickness value and distributed to the AGC.Our proposed edgedrop gauge is designed to measure the following parameters: Strip centerline thickness Edge thickness profile Edgedrop Wedge Crown Strip width Position of strip edge1.1.1 Scan ModesStandard mode for edge drop gaugeCross profile modeEdge detection mode1.1.2 Calculation of the wedge, crown and edge drop valuesRemarks(1) hew/hed = Edge thickness at e mm from the real edge. The value e is adjustable on screen or per data link, the start value is 5 mm. (2) hjw/hjd = Edge thickness at j mm from the real edge. The value j is adjustable on screen or per data link, the start value is 10 mm.(3) hc = Centerline thicknessValueFormula2 Typical Data of an Edgedrop Gauge for Tin Plate2.1 Typical Gauge DataC-framefor example exit sideDrawing number6210-9-M10, Bl.1Number of detectors/ (edge/centre/edge)15 / 2 / 15Ionization chamber (detector)KG 20/20X-ray tube (100kV)MXR 101 X-ray high voltage, tube currentca. 60 kV, 3-5 mAMeasuring Gap450 mmThroat depth3200 mmPassline950 mmMeasuring spot, centerline head,2 detectors (w x l)4,75 x 23,75 mmMeasuring spot, edge heads4,75 x 23,75 mmMeasuring zone, edge heads142.5 mmDriving distance C-frame6000 mm, variable - depending on the applicationDriving distance edge heads550 mm, variable - depending on the applicationDriving speed C-Frame4-8 m/minDriving speed edge heads0,5-4,0 m/min2.2 Technical and Performance Data of the Centerline HeadMeasuring range0 - 2,0 mmAnalogue time constant1,4 msSample rate500 sMeasuring value output2 ms, as floating average, adjustable (1-64)Measuring accuracy(Reproducibility) 0,1 %, not better as 0,2 mLinearity 0,05 %Long term drift/8hAccording DIN IEC 769 0,1 %, not better as 0,2 mStatistical noise (2s)(T = 5 ms) 0,1 %, not better as 0,2 m2.3 Technical and Performance Data of the Edge HeadsMeasuring range0 - 2,0 mmAnalogue time constant1,4 msSample rate500 sMeasuring value output50 ms, as floating average, adjustable (1-64)edge thickness profile, edge drop, crown, wedge, actual width, strip edge positionMeasuring accuracy(Reproducibility) 0,1 %, not better as 0,2 mLinearity 0,05 %Long term drift/8hAccording DIN IEC 769 0,1 %, not better as 0,2 mStatistical noise (2s)(T = 5 ms) 0,1 %, not better as 0,2 mAccuracy strip width 0,5 mmAccuracy strip edge position 0,3 mm3 Typical Data of an Edgedrop Gauge for Fine Strip3.1 Typical Gauge DataC-framefor example exit sideDrawing number6210-9-M10, Bl.1Number of detectors/ (edge/centre/edge)15 / 2 / 15Ionization chamber (detector)KG 20/10X-ray tube (160kV)MXR 161 X-ray high voltage, tube currentca. 85 kV, 3-5 mA (Measuring range 5,0 mm)ca. 95 kV, 3-5 mA (Measuring range 8,0 mm)Measuring Gap450 mmThroat depth3200 mmPassline950 mmMeasuring spot, centerline head,2 detectors (w x l)4,75 x 23,75 mmMeasuring spot, edge heads4,75 x 23,75 mmMeasuring zone, edge heads142.5 mmDriving distance C-frame6000 mm, variable - depending on the applicationDriving distance edge heads550 mm, variable - depending on the applicationDriving speed C-Frame4-8 m/minDriving speed edge heads0,5-4,0 m/min3.2 Technical and Performance Data of the Centerline HeadMeasuring range0 - 5,0 mm (8,0 mm)Analogue time constant1,4 msSample rate500 sMeasuring value output2 ms, as floating average, adjustable (1-64)Measuring accuracy(Reproducibility) 0,1 %, not better as 0,3 m (Measuring range 5 mm) 0,1 %, not better as 0,5 m (Measuring range 8 mm)Linearity 0,05 %Long term drift/8hAccording DIN IEC 769 0,1 %, not better as 0,3 m (Measuring range 5 mm) 0,1 %, not better as 0,5 m (Measuring range 8 mm)Statistical noise (2s)(T = 5 ms) 0,1 %, not better as 0,3 m (Measuring range 5 mm) 0,1 %, not better as 0,5 m (Measuring range 8 mm)3.3 Technical and Performance Data of the Edge HeadsMeasuring range0 -