Research And Application Of Four-bolt Synchronous Installation Based On Electro-hydraulic Proportional Control

Flange connection is a commonly used connection method in industrial production and infrastructure construction.It is widely used in engineering fields such as mining machinery,water turbine units,petrochemical industry,and wind power generation.During the installation of the flange connection,the bolts are required to apply force evenly and the flange faces are closed in parallel,especially for pressure vessels and pipeline flanges in the petrochemical industry.At present,in actual engineering,a pump station and multiple hydraulic torque wrenches are manually controlled to perform simultaneous tightening of multiple bolts on the flange.However,the torque values output by multiple hydraulic torque wrenches vary greatly,and simultaneous tightening of multiple bolts cannot be achieved.It is easy to bias the flange,resulting in the failure of the flange sealing structure and causing accidents such as media leakage.Therefore,how to ensure the even force of multiple hydraulic torque wrenches during flange installation and achieve the simultaneous tightening of multiple bolts is a technical problem to be solved in the project.In view of the above problems,this subject takes four-way hydraulic torque wrench as the research object,combined with the actual work requirements,a four-bolt synchronous installation system based on electro-hydraulic proportional control technology is proposed.First,through the analysis of the working process of the hydraulic torque wrench and the flange installation and fastening process,the hydraulic synchronous drive system is designed based on the electro-hydraulic proportional control technology,and the parameter calculation of the hydraulic drive system and the selection of hydraulic components are completed;Second,a torque PID control strategy based on fuzzy PID was designed.Through the united simulation of AMESim and MATLAB/Simulink,the comparison study of fuzzy PID and traditional PID control strategies was carried out to verify the effectiveness of the designed control strategy;The construction of the synchronous installation system controller was completed with the microcontroller as the core,and the construction of the corresponding hardware circuit and the writing of the software process were completed;Finally,after the experiments on the industrial site,the design was verified the feasibility of the program.The bolt synchronous tightening control system designed in this subject can ensure that the four-way hydraulic torque wrench completes the fixed torque and synchronous tightening during the bolt tightening process,and ensures that the bolt pretension force will not damage the flange under the premise of pressing the flange,and at the same time,the flange can be closed in parallel.The flange leakage problem is effectively solved,and the construction quality and safety of the project are greatly guaranteed.