Design And Analysis Of Multi-disc Brake With Overflow Cooling

In the working process of shearer,especially in the working face with large dip angle and steep dip angle,the braking torque required is large,which is easy to cause the brake heating and wear.The brake friction disc is easy to produce thermal deformation,thermal decay and other phenomena in the work,and even the friction failure,brake instability and structural damage caused by overheating.In this paper,on the basis of the original multi disc brake,combined with the structure and working characteristics of the shearer,through the improvement of the structure of the multi disc brake,and the hydraulic system of the shearer cooling system is used to carry out the forced water cooling of the brake friction plate,so as to improve its working performance.In order to overcome the instability phenomenon of shearer brake,a multi disc brake with circulating water medium is put forward,and a series of design and analysis of the brake are carried out.The research content includes the following aspects:(1)On the basis of the existing multi disc brake,through the structural improvement,the principle and structural design of the super water cooling multi disc brake are completed.(2)Taking the MG/750/1910 shearer as the research object,combined with the water component of the cooling and spraying system of the shearer,the design of the water system for the multi disc brake system with water cooling is completed.According to the main working parameters of the shearer,the main performance parameters of the brake are calculated,the design requirements of the brake are put forward,and the design and calculation of the overall structure are completed.(3)Simulation analysis and Research on the working performance of the over flow cold disc brake are carried out.The finite element analysis software is used to establish the finite element model of the flow field of the brake's dynamic and static friction plates and the over-current cooling in the brake chamber.The solid deformation field and flow field of the brake disc are analyzed and calculated.The contact stress on the surface of the friction plate is simulated and the contact pressure distribution is obtained.The flow field of the circulating cooling water in the cavity of the wet multi-disc brake is simulated and the distribution characteristics of flow velocity and pressure of the multi-disc brake were obtained.The thermal fluid-structure coupling model of multi-disc brake is established by ANSYS Workbench,and the braking temperature rise of multi-disc brake is simulated and analyzed.(4)Through the comparative test,the actual braking performance of the super water cooling multi disc brake is analyzed,and the comparative test between the super water cooling multi disc brake and the ordinary multi disc brake is carried out to test the braking performance and heat dissipation capacity of the brake.Finally,it is found that under the premise of ensuring the braking performance to meet the requirements,the heat dissipation capacity of the water-cooled multi disc brake is greatly improved.Compared with the ordinary brake,the temperature of the water-cooled brake is significantly lower after braking in many emergency braking tests,and the temperature rise speed of the water-cooled brake is slow in the continuous braking test,which has good working stability.It can be seen that the over water cooling multi disc brake has the characteristics of strong heat dissipation,stable braking performance and reliable operation.On the basis of the existing working system of the shearer,there is no need to make large structural changes to the common brake,and the existing spray cooling system water system of the shearer is introduced through the way of over water cooling.The working performance of the traditional multi disc friction brake is significantly improved,so as to improve the safety and reliability of the shearer.The conclusion of this paper has good engineering application prospect and high application value.