Study On The Hydro Electric Compompound Retarder With A Structure Of Two Salient Poles And Open Blades

With the rapid economic development and technological progress in China,the research and design of special engineering vehicles have made great progress.Among them,heavy mining vehicles are mainly used for the handling of large-scale mine earthwork materials.Their working environment is poor,vehicles need frequent braking.Therefore,higher requirements are put forward for the reliability of vehicle braking system and the safety of vehicle driving.Through the installation of high performance The retarder can effectively solve the above problems.At present,eddy current retarder and hydraulic retarder are widely used in domestic and foreign markets as solutions.In view of the shortcomings of the two mentioned above,this paper proposed a new designed electro-hydraulic compound retarder with open blades and two salient poles combined with the braking characteristics of heavy mining trucks.its studied and proved through the following parts:The first chapter introduced the background and significance of research and development,including the retarders normally used in the market and its current research status,the corresponding retarder coupling field analysis theory.In the second chapter,through the analysis of the structure and performance characteristics of the new-type hydro electric compound retarder: electromagnetic retarder with two salient poles and straight blade structure hydraulic retarder,the design idea of the new scheme proposed in this paper was brought out,and the structure and working principle of the new scheme were introduced in detail.In the third chapter,through made the theoretical derivation under the steady electromagnetic field condition and the simulation analysis under the transient electromagnetic field condition,the braking characteristics of the electromagnetic part were studied and demonstrated,and whether the electromagnetic braking characteristics meet the corresponding eddy current braking characteristics was discussed.In the fourth chapter,the mathematical model of the hydraulic braking part of the new-type hydro electric compound retarder was deduced,and the flow field simulation under the condition of full filling was carried out.Finally,the brake characteristics of the hydraulic part of the new-type hydro electric compound retarder were analyzed and compared with the base type,and the brake characteristics of the hydraulic part were studied and demonstrated to explore whether its working characteristics seem as the characteristics of the hydraulic braking.In the fifth chapter,the flow heat coupling model was constructed for the electromagnetic braking part,and the magnetic flow heat multi field coupling analysis was carried out by using the two-way coupling method.The magnetothermal characteristics of the retarder were further studied,and the influence relationship between the hydraulic braking and the electro-magnetic braking was preliminarily discussed.In the sixth chapter,the prototype of the retarder was tested on the bench to study its basic working characteristics,verify the feasibility and rationality of the above design scheme and related research theories.The innovation of this paper is to put forward a new design scheme of hydraulic electric compound retarder with highly integrated structure for the reliable braking of heavy mining vehicles.The hydraulic braking part adopted the straight blade impeller rotor structure designed by integration,which simplified the structure and improved the space utilization ratio.In view of the mutual influence of multiple physical fields in the retarder,this paper also used the magnetic thermal flow multi field coupling method to preliminarily analyzed the influence relationship between the field and the field,which provided a certain theoretical basis for the reliability of the design scheme.