Research On Take-up Device Of Transport Crossheading Belt Conveyor

As a key part of the transport crossheading belt conveyor, the take-up device plays animportant role in safe and efficient operation of the transport crossheading belt conveyor.Aiming at current problems of the transport crossheading belt conveyor, the followingresearches have been carried out.Hydraulic principle diagram of the take-up device is designed and the system pressure,flow rate and pipe diameter are calculated. The pump, hydraulic motor and Electrohydraulic proportional valve are selected based on calculation. The winding drum isanalyzed by using finite element method and the suggestions for improvement are given.Aiming at the shortcomings of the brakes used currently, a hydraulic brake, composed byfriction discs, is designed and the modal analysis of the bracket of the brake is carried out,main frequencies and vibration modes are achieved. The improved design of the ropepulley abutment is carried out, the analysis results show that the mechanical properties ofthe abutment is improved meanwhile the weight is reduced. The work flow of the take-updevice is given, which provides theoretical basis for safe operation of the take-up device.By using software AMESim, the role of the energy accumulator, effect of energyaccumulator volume size and the pipe length between hydraulic cylinder and on responsecharacteristics are simulated. The response characteristics under belt tension mutation arealso studied. The effect of proportional, integral and differential gain on system response isanalyzed comparatively. Taking the electro hydraulic proportional valve as key part, theclosed loop control model with force feedback is established. The analysis results showthat the PID controller can meet the requirements of adjustment of hydraulic pulling force.Based on the analysis of the working principle of the brake, the conservation ofenergy, heat conduction, radiation and convection are analyzed theoretically, whichprovides theoretical basis for thermal-mechanical analysis during the braking process.Taking thermal stress finite element method, the thermal-mechanical coupling model isestablished and analyzed numerically. The temperature field distribution of the contactsurface and the torque variations during the initial period are obtained. Based on thethermal-mechanical coupling model, the effect of friction disc rotating speed and discspring force on braking process is studied numerically and the main influence laws areobtained.Taking the hydraulic cylinder to simulate the belt, and work as loading device, theperformance testing equipment of the take-up device is established. The experiments of take-up process, adjustment of the hydraulic cylinder pulling force and the braking time ofthe hydraulic brake are carried out. Variations of the hydraulic cylinder rod chamberpressure and the system pressure are obtained. The results show that the PID controller hasa better effect on adjustment of the hydraulic cylinder pulling force, and the parameters ofthe PID controller should be adjusted according the actual situation. The braking time isabout0.5s，which can meet the requirements of the take-up device.