Surface finish detection system of high-voltage cable semiconductive material strip
The structure of XLPE high voltage cable insulation is composed of an insulative layer and semiconductive layers. The semiconductiv material is a blend of polyolefin elastomer material and carbon black, which is used for the boundary layer of the electric field of the cable insulation layer. Since the physical properties of the semiconductive layer and the insulative layer are similar, they are also co-extruded in the production process, there is no air gap at the interface. The electric field in the insulation from the high potential of the core shielding layer to the low potential of the external shielding layer is perfect in XLPE insulation layer, which can withstand higher operating voltage and service life. According to the principle of higher electric field strength at the small curvature radius of the equipotential surface, the semi-conductive layer faces the insulation. If there are protrusions on the interface, it will cause the increase of the electric field strength to damage the insulation. Therefore for, the production of semi-conductive materials and cable insulation systems, it is required to limit the number and size of the protrusions on the surface of the semi-conductive layer strictly.
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Surface finish detection system of high-voltage cable semiconductive material strip
The structure of XLPE high voltage cable insulation is composed of an insulative layer and semiconductive layers. The semiconductiv material is a blend of polyolefin elastomer material and carbon black, which is used for the boundary layer of the electric field of the cable insulation layer. Since the physical properties of the semiconductive layer and the insulative layer are similar, they are also co-extruded in the production process, there is no air gap at the interface. The electric field in the insulation from the high potential of the core shielding layer to the low potential of the external shielding layer is perfect in XLPE insulation layer, which can withstand higher operating voltage and service life. According to the principle of higher electric field strength at the small curvature radius of the equipotential surface, the semi-conductive layer faces the insulation. If there are protrusions on the interface, it will cause the increase of the electric field strength to damage the insulation. Therefore for, the production of semi-conductive materials and cable insulation systems, it is required to limit the number and size of the protrusions on the surface of the semi-conductive layer strictly. The specific implementation of the quality control system is to control the number and size of the protrusions on the surface of the semiconductive material strip.
The development of high-voltage cable semi - conductive shielding material surface finish detection system is based on low-temperature extrusion and casting technology of polymer materials, and electronic camera optical detection technology (or machine vision technology). The system is equipped with a high-speed vision camera and a special LED line-light source to detect size information of the protrusion in real time. The image processing capacity is 15 million pixels per second. It can achieve high-speed and high-resolution measurement. At the same time, the camera system has a wide field of view and high pixels. It can synchronous measure the calibration area while measuring the sample to calibrate real-time.
挤出系统 / Extrusion system | |
电源 Power supply | 3×380V,50/60 Hz ,+N +PE |
电机 Motor | 施耐德伺服电机 Schneider servo motor |
电机功率 Power of motor | 1.8 kW |
减速比 Reduction ratio | 1:35 |
螺杆直径 Screw diameter | 20mm |
螺杆长径比 Screw L:D | 25 :1 |
螺杆材质 Screw material | 进口高强度合金钢 Imported high-strength alloy steel |
螺杆压缩比 Screw compression | 1.5:1 |
温控系统 Temperature control system | 日本 RKC, 加热冷却双 PID 控制 RKC company of Japan, heating and cooling dual PID control |
喂料方式 Feeding | 体积喂料 Volumetric feeder |
最高可控温度 Maximum controllable temperature | 350℃ |
温度传感器 Temperature sensor | J 型热电偶 J type thermocouple |
加热区 Heating zone | 4 区加热（螺筒 3 区加热冷却， 模具 1 区加热） 4 zone heating (3 zone heating and cooling of the screw barrel, heating zone 1 of the die) |
加热方式 Heating | 电加热 Electrical heating |
加热总功率 Heating power | 4.0kW |
冷却方式 Cooling | 风冷 Wind |
模具 Die | 口模尺寸 60mm×1.5mm lip of die 60mm×1.5mm |
成膜系统 / Film Casting system | |
电源 Power supply | 3×380V,50/60 Hz ,+N +PE |
流延辊尺寸 Size of casting roll | Φ200mm×200mm |
流延辊中心高 Center height of casting roller | 1022 mm |
流延成膜宽度 Reduction ratio | 25~30 mm |
流延成膜厚度 Thickness film of casting | 0.5mm±0.02 |
流延辊控温方式 Method of casting roll temperature control | 冷热一体机恒温控制 constant temperature control of the cooling and heating integrated machine |
流延辊驱动电机 Casting roller drive motor 功率 power | 伺服电机 servo motor 640W |
牵引辊驱动电机 Traction roller drive motor 功率 power | 伺服电机 servo motor 640W |
光学检测系统 / Optical inspection system | |
测量厚度 Thickness of measurement | 0.4~0.5 mm |
凸起高度分辨率 Resolution of protrusion height | 20μm |
视场宽度 Width of field | 0~75 mm |
检测宽度 Width of detection | 44mm |
最小成像宽度 Width of the minimum imaging | 10μm |
最小测量尺寸宽度 Width of the minimum measurement size | 30μm |
检出率 Detection rates | 100% |
测试速度 Speed of measurement | >1kg/h |
室内环境 Work environment | 一万级 The class often thousand |
使用温度 Operating temperature | 0 ~ +40℃ |
收膜速度 Film-drawing speed | 0~110mm/s |
环境湿度 Environment humidity | < 65% |
测量辊参数 Measuring roller parameters | |
直径 Diameter | 40mm |
同轴精度 Coaxial accuracy | 3μm |
测试光源 Test light source | 220mm 长线扫描光源 220mm line-scanning light source |
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