High-speed Rotating Mechanic-hydraulic Servo Cylinder Test-bed Design And Control Performance Study

Blower and induced draft fan are important auxiliary equipment of thermal power plants.Their functions are to ensure the full combustion of pulverized coal in the boiler and to remove the high temperature as well as high pressure flue gas in the boiler.In the process of thermal power generation,the excessive air volume of the fan will lead to energy waste,and the small air volume will affect the normal operation of the boiler,so the fan air volume adjustment mechanism plays an important role in the normal operation of the thermal power plants.The mechanic-hydraulic servo cylinder with high rotation speed is the core part of the air volume regulating mechanism of the fan so that its performance directly determines the working capacity of the fan.It is very important for the performance test and analysis of the mechanic-hydraulic servo cylinder with high rotation speed before installation.In recent years,with the development of science and technology,higher requirements are put forward for the performance detection of servo hydraulic cylinder.In view of the mechanic-hydraulic servo cylinders for fan need to rotate with the fan blade at high speed,in order to accurately detect the working performance of servo hydraulic cylinders,it is necessary to design a new set of special test-bed for the servo hydraulic cylinder with high rotation speed.Firstly,according to the performance test requirements of the mechanic-hydraulic servo cylinders with high rotation speed,based on a large number of domestic and foreign literature,a set of servo hydraulic cylinder test-bed which can simulate the high-speed rotating experimental environment of the fan is designed and developed.The test-bed not only can realize the performance test of the servo hydraulic cylinders in rotation,but also can test the different types of 5T,10 T,50T,100 T servo hydraulic cylinders.Because the test-bed of the servo hydraulic cylinder needs to be tested in the high-speed rotating environment,the static and dynamic finite element analysis of the structure of the test-bed is carried out in this paper,which verifies the scientific and reasonable for design of the test-bed.According to the actual requirements of the project,the hydraulic control system of test-bed of the mechanic-hydraulic servo cylinder with high rotation speed is designed and analyzed.Secondly,in order to study the control performance of the mechanic-hydraulic servo cylinder with high rotation speed,the mathematical model of the valve control cylinder of servo hydraulic cylinder control system is established,the response performance and stability performance of the control system are analyzed by using the computer simulation technology and the structure of the mechanic-hydraulic servo cylinder is optimized.Finally,the flow field of the spool valve clearance of the mechanic-hydraulic servo cylinder is analyzed by finite element method and the effect of different eccentricity and taper on the control performance of the system are studied to ensure that the system has good control performance.The research on the high-speed rotating mechanic-hydraulic servo cylinders and its test-bed in this thesis lays a solid foundation for the design and production technology improvement of the mechanic-hydraulic servo cylinders for fan.