Development Of Hydraulic Test Bench For Brakes For Shearer

On the basis of careful analysis of the electric inertia test bench,this subject finds that the control of the electric inertia test bench is complicated,the flywheel disk is large in volume,and the installation accuracy is high.When the flywheel disk rotates at high speed,there is a large safety hazard and the mechanical inertia.The test bench can not realize the shortcomings of inertia and torque infinite change.The liquid inertia test bench is proposed and designed.The variable d’isplacement pump and the quantitative motor and the electro-hydraulic proportional valve are used to simulate the moment of inertia and provide the spindle torque and speed.The control is relatively simple,and the flywheel disk volume is greatly reduced,and the installation accuracy of the test piece hydraulic components is low.The main research work of the thesis is as follows:(1)The actual working conditions of the shearer are analyzed,and the key parameters such as the total traction resistance,total moment of inertia and maximum braking torque of the shearer are calculated,which provides a basis for the performance indicators of the test bench pre-simulation.Based on the preliminary determination of the overall test bed program,a mathematical model of the hydraulic system is established for the test bench,which,can help analyze and optimize the energy compensation distribution of the test bench,and provide a theoretical basis for f-urther optimization of the test bench.(2)Based on the analysis of the mechanical inertia of the mechanical inertia,the mechanical inertia is simulated by the variable displacement pump and the hydraulic volume control system composed of the hydraulic motor and the electro-hydraulic proportional valve.The liquid is proposed based on the mechanical inertia and the electric inertia.Inertia.Based on the theory of liquid inertia,the mechanical structure of the liquid inertia simulation test bench and the complete hydraulic system were designed,and the theory was transformed into practice.(3)A signal acquisition system is designed for the test bench.The upper layer of the test bed signal acquisition system uses C8051F410 as the microcontroller.Based on this,the displacement acquisition circuit,temperature acquisition circuit,torque speed acquisition circuit and upper layer signal acquisition system serial communication program are designed.Design,build an embedded system for the underlying signal acquisition system of the test bed,build tftp,nfs server,build root file system for the underlying embedded system of the test bed,transplant the boatloader,cut the linux kernel,and develop the board for the test bed.The core hardware is written to drive.(4)After developing the embedded system of the test bench,the human-computer interaction interface is developed for the test bench on the QT platform.The test bench can collect the displacement amount of the brake friction plate,the temperature,the rotational speed of the spindle,the torque,and the braking process.Noise,the actual amount of signal collected in the form of real-time dynamic curve on the test-machine human-computer interaction interface.