Detection Of Connection Hole Of Trough Solar Heat Collecting Bracket Based On Vision

Trough solar collector bracket is a key component in the construction process of trough solar power station,which has the characteristics of large size,easy deformation and difficult processing.The size and position accuracy of the connecting holes of the torque tube and the mirror directly affect the assembly of the bracket,the torque tube and the condenser.At present,the detection of the connecting hole of the collector support can only be done by means of the tools by hand,and the detection efficiency and accuracy are low.According to the characteristics of the slot solar collector bracket connecting hole need fast and accurate detection,this thesis develops a set of offline visual detection system,which can quickly and accurately detect the size and position error of the connecting hole on the collector bracket.The main research contents are as follows :(1)Present a method of off-line detection of the connecting holes on the trough solar collector bracket by using visual inspection techno logy combined with comparative measurement.Through the system calibration of the standard bracket,the parameters of the bracket to be measured can be obtained.This method does not need to consider the error in measurement,and has the advantages of fast visual detection speed,high accuracy and non-contact.(2)A monocular camera is used to detect the inclination of holes on thick plate parts.A shadow extraction algorithm based on HSV inverted cone model is proposed,which is used to extract the upper and l ower edges of the connecting hole of torque tube,making the extracted contour closer to the actual contour.After the edge contour is extracted,the center coordinates of the upper and lower edges of the hole are fitted,and the inclination can be calculated according to the thickness of the board and the distance between the center of the hole.(3)Study the image processing algorithm of double hole extraction,and solves the problem of using one image to detect the position degree of two holes at the same time(double hole position degree detection technology).A monocular camera is used to photograph two holes on the mirror connecting plate at the same time.Through the image processing of the two holes,the feature parameters of the two holes are extracted at the same time.Compared with single hole detection,the double hole detection improves the detection efficiency and reduces the number of cameras.(4)The evaluation index of the connecting hole of the heat collecting bracket is discussed in detail.The inclination error detection of the connecting plate of the torque tube and the whole hole center deviation detection of the connecting plate of the mirror are added,and a complete evaluation system is proposed;The accuracy of the detection system is verified by simulation experiment and repeated error verification,which ensures the detection accuracy and stability of the detection system.(5)Develop the man-machine interactive operation system.The semi-automatic detection of the connecting holes of the tr ough solar collector bracket is realized,which greatly improves the detection efficiency and accuracy,and is of great significance for the mass detection of the trough solar collector bracket.