Research On Application Of Control Technology For Hydraulic Brake System Of Vertical Shaft Hoist

The vertical shaft hoist is one of the key equipment in the coal mining process,its safe and stable operation is essential.As the brake device of the hoist,the vertical brake hoist hydraulic brake system has the dual mission of working brake and safety brake.The thesis analyzed the problems in the existing hoist brake system,proposes the optimized design scheme in a targeted manner,and simulates and experiments are used to verify the design scheme.Firstly,the working principle of hydraulic brake system of vertical shaft hoist is introduced and the structure of the hydraulic brake control system is designed in this thesis.The electro-hydraulic proportional valve closed-loop control system is designed to perform constant deceleration braking on the hoist for the jitter problem occurred during the hoist braking process.The system is mathematically modeled and the dynamic characteristics of the system are analyzed.The fuzzy PID control algorithm is designed to correct the system.The AMESim-Simulink joint simulation is used to verify the improvement of the hoist constant deceleration braking effect.Secondly,the necessity of reliable and energy-saving driving of electromagnetic directional valve is analyzed in this thesis,and the hardware of the energy-saving driving circuit of electromagnetic reversing valve is designed,and the experimental platform was built to verify the circuit function.It has been verified that the drive circuit can save more than 30% under rated load.Thirdly,the condition monitoring device for the problem of difficult maintenance of the hydraulic brake system of the hoist is designed in this thesis,and monitors the running status of the hydraulic station and the disc brake in real time,and selects the corresponding sensor and data acquisition card.Finally,the hydraulic brake system controller of vertical shaft hoist is designed in this thesis.The thesis completes the hardware and software design of the controller,and develops the upper monitor to carry out online monitoring of relevant parameters.The thesis also carried out hardware experiments on the signal detection module of the controller,and obtained the transmission error and channel accuracy of each signal detection channel.After testing,the transmission accuracy meets the system design requirements.