Numerical Analysis Of Wet Multi-disc Brake On Tunnel Mining Vehicle

The wet brake is the key component to ensure the safe running of underground mine conveyer.With the advantages of large braking torque,strong anti-pollution ability and favorable heat dissipation,it has been used more and more in engineering vehicles.Underground work in environments such as gas plays a vital role,especially in oil,mud and gas of underground work environment.Tunnel mining vehicles often work in a large load environment,and so the brake friction disk is prone to high temperature and high thermal stress,which easily causes excessive wear or invalidation of the brake,resulting in serious accidents of life and property.Therefore it is of great significance to study the performance of wet brake.In this paper,according to the requirements of the national document standard for the braking system of the engineering vehicle,based on the relevant data of a certain type of tunnel dump truck,the key parameters of the wet multi-disc brake are calculated,and the three-dimensional model of the brake is established according to the parameters.Then,the numerical analysis method on the analysis of the vibration characteristic was calculated to obtain the modal frequency of the friction plate and shell.The low order modal frequencies of the main components are not in the range of unstable vibration frequency,so the friction disk will not resonate and the vibration characteristic is stable.Then,the heat flux produced by friction of brake disc is calculated by means of microelement method,and the formula of friction plate temperature is deduced,and the heat flux and temperature variation law of friction pair surface are obtained.The transient temperature field and thermal stress of brake disc are analyzed by finite element software.The results show that the temperature and stress are gradually increasing and later decreasing with the braking time increasement,and the temperature distribution is uneven on the friction pair.And the stress changes in the initial braking stage,the stress at external diameter of friction disk is larger,and with the increase of temperature,the maximum stress occurs in the larger temperature region.Nevertheless ultimate the maximum temperature and stress can meet the design requirements of the brake disc.Finally,in order to achieve better braking effect and cost saving,in this paper,the genetic algorithm is used to carry out the design of the brake disc.The results show that the optimized comprehensive performance is good.It not only improves the whole braking efficiency,but also saves the internal space of the assembly and the manufacturing cost of materials effectively.It can provide reference for practical application of engineering.