Research On Key Processing Technologies Of In-situ Of Trough-type Solar Thermal Power Generation Heat-collecting Support

Concentrating Solar Power(abbreviated by CSP hereafter),which is characterized by the high quality and the low cost of power generation,is one of the green energy forms that humans depend on in the future.As a key component of CSP,the part of heat collection is known as the“backbone supporting the solar island of the CSP station”.The heat collecting bracket,which belongs to the part of the heat collection,has large production batch,high processing accuracy,and its stiffness is reduced due to the large structure size.These characteristics lead to low manufacturing efficiency and high defective rate,which directly affect the construction speed and cost of CSP station.This thesis takes the torque-tube heat collector bracket with trough solar as the research object,and uses The clamping method of in-situ machining to realize the highly efficient processing.The specific research content is as follows:(1)The thesis studies the influence of the structural characteristics,welding deformation and the distribution of the connecting plate on the processing quality of the torque tube type heat collection bracket,especially the influence rule of its clamping deformation.The thesis puts forward the processing and manufacturing requirements of the welding parts and the connecting plate of heat collection brackets,and determines the quality factors of bracket welding to further improve the manufacturing quality assurance system of heat collection bracket.Based on the clamping methods of multi-point processing and single-point in-situ processing of heat collector bracket,this thesis proposes the design criteria of fixture for in-situ processing of heat collector bracket.In addition,the clamping method of multi-point in-situ machining of heat collection bracket is optimized to meet the requirements of fast and stable clamping and improve the accuracy and speed of processing.(2)In this thesis,aiming at the two problems of uncontrollable welding deformation of the connecting plate and the positioning accuracy of the connecting plate,the mathematical model of position and pose state transformation of the connecting plate is established,and the position and pose measurement mechanism is studied on this basis.Based on the four-point positioning method,the displacement pose conversion and rotation pose conversion models of the follow-up smart fixture are deduced.Through data collection,the set of positions and poses of the connecting plate of the heat collection bracket is obtained.Then,the set of positions and poses of the intelligent follow-up fixture is overlapped with that of the connecting plate of the heat collection bracket through forward transformation.The thesis trains the set of sample information and compares the multiple of error prediction models,then use the bagging model with high accuracy as the error prediction model of the conversion system of position and pose.In this paper,the position and pose conversion information system of the special fixture for heat collecting bracket is developed by combining the position and pose state analysis of the connecting plate,the position and pose conversion algorithm of the intelligent fixture and the position and pose error prediction algorithm based on the decision tree.And the visualization is implemented.(3)According to the clamping criteria of the connecting plate of the heat collection bracket and the measurement mechanism of position and pose,the composition structure of a special fixture system that meets the requirements of in-situ processing is studied.Based on the method of Fuzzy PID control,this thesis studies and develops the hardware circuit structure and control software system of the in-situ fixture control system,and establishes the human-computer interaction interface of the system.The simulation model of the control system is established by MATLAB,and the input of the system is loaded,then the method of Fuzzy PID control is compared with the method of the traditional PID control.The results show that the maximum output overshoot under the Fuzzy PID control mode is 7.2%and adjustment time is 2s.This can quickly achieve the purpose of control,and determine the accuracy and timeliness to meet the requirements of the use of in-situ fixture.The fuzzy relation between parameters K_p、K_I、K_Dand e,e_c is established,and the fuzzy control rule and parameter revision curve are obtained.The fixture system studied in this thesis can greatly improve the accuracy and speed of the heat-collecting bracket clamping,and effectively guarantee the processing accuracy and efficiency of the heat-collecting bracket,and have a practical effect and theoretical guiding significance on improving the batch manufacturing capacity and processing level of large-size structural parts.