Sealing Failure Analysis Of Sprocket Assembly Of Scraper Conveyor And Structure Design Of Fingertip

With the continuous development of coal mining technology in China,researchers pay more and more attention to the stability and reliability of mechanical equipment in fully mechanized coal mining area.Scraper conveyor sprocket components often cause frequent well maintenance due to seal failure,which not only increases the operation cost of enterprises,but also seriously affects the productivity of enterprises,which is an important problem faced by coal mining enterprises.In this paper,the failure of floating oil seal of sprocket assembly is analyzed and studied,and a new sealing method of sprocket assembly,namely fingertip sealing,is proposed.The main research contents are as follows:1.Through the field investigation of the enterprise,the working principle of the scraper conveyor sprocket assembly is mastered,and the whole sprocket assembly is three-dimensional modeling,and its structure is analyzed.The failure form of floating oil seal is analyzed from the maintenance report of the dismantlement sprocket assembly,the finite element analysis of the O-ring of floating oil seal is made,the stress-strain neogram of the floating oil seal is obtained,and the failure reason of the floating oil seal is studied and summarized.2.Based on the actual sealing conditions of the sprocket assembly,the constraint conditions of the new sealing mode were established,and the fingertip seal was introduced.The fingertip seal structure was designed on the basis that the structure of the sprocket assembly did not change greatly,and the finite element model of fingertip seal was established according to the structural parameters of the sprocket assembly.The influences of the number of fingertip beam,the root circle of fingertip beam and the thickness of sealing sheet on the sealing performance and wear performance of fingertip were analyzed.According to the above analysis results,the optimal geometric parameters of the seal were determined.At the same time,the main leakage channel model of fingertip seal was established to study the main leakage positions of fingertip seal under the actual working conditions3.Considering that the scraper conveyor inevitably generates vibration phenomena during operation,it has established a niczine-enacted characteristic analysis model,analyzes and obtains changes in assembly pressure and transmission amount on fingertine sealing and characteristics.Exploring the incentive form of the sprocket axis,further dividing the finger-tip sealing dynamic analysis rotor calculation area.The effects of assembly pressure,bearing swags,assembled contrasts under ideal conditions were analyzed,and the effects of wear performance and wear performance were analyzed.The gear sealing dynamic performance performance is studied under the two working conditions of the sprocket assembly,and the changes in the seal and wear performance are obtained.4.Introduced the fingertips sealing test table,according to the internal sealing chamber structure of the sprocket assembly,design and processed the experimental pieces,assemble the experiment,and install the experiment to the fingertips Table.Preparation for finger tip sealing experiment under the sprocket assembly conditions.Under the conditions of the geometry,process,etc.,analyze and measure the static,dynamic fingertips sealing experiment,comparison with the simulation results,and analyze.Under the different conditions of the rotor speed,change the thickness of the baffle to adjust the sealing pressure,record and analyze the changes in the rotational speed and assembly pressure on the finger tip seal leak gap,verify the sealing of the pointer under the sprocket assembly Strict performance.