Research On Meshing Mechanism And Experimentation Of Double-Pitch Time-sharing Meshing Silent Conveyor Chain

With the rapid industrial development of our country, the production and demand ofcar has greatly increased, and the output of one car is always completed by hundredsassembly lines through thousands working procedures. The chain conveyor is widelyapplied for the conveying of assembly line of car, and the conveying chain on currentconveyor is roller chain, with the increase of requirement for the reliability, synchronismand environmental friendliness of conveyor, the further development of chain conveyor islimited by the features of roller conveying chain, which requires to research new conveyorchain system urgently to improve the reliability, synchronism and environmentalfriendliness of chain conveyor on hundreds assembly lines. In this paper, double-pitchtime-sharing meshing silent conveyor chain is proposed by analyzing how the conveyorchain affects the performance of conveyor and the performance of silent chain, and theresearch on mathematical modeling of parameter of each part, meshing analysis, reliabilityand environmental friendliness of double-pitch time-sharing meshing silent conveyor chainsystem is carried out.The design features of double-pitch time-sharing meshing silent conveyor chain andchain plate of double-pitch time-sharing meshing silent conveyor is proposed on the basisof applying tooth chain on chain conveyor, and double-pitch is the double-pitch onmeshing pitch circle, each chain plate has three teeth, and the external tooth profile of themiddle tooth profile, the first tooth profile and the third tooth profile is straight toothprofile, and the internal tooth profile of the first and third tooth profile is convex curvetooth profile. Compared with external meshing silent conveyor chain with the same singlepitch, the self-weight of chain with same number of plate of each pitch is reduced24.6%,according to the relevant coupling parameters of double-pitch time-sharing meshing silentconveyor chain—chain wheel—cutting tool of chain wheel, the chain wheel with straighttooth profile of double-pitch time-sharing meshing silent conveyor chain and the chainwheel with negative addendum modification involute tooth profile is designed, themathematical modeling of negative addendum modification factor of chain wheel withinvolute tooth profile of double-pitch time-sharing meshing silent conveyor chain isestablished, and the parameters of chain of double-pitch time-sharing meshing silentconveyor chain which meshes with the chain wheel with negative addendum modification involute tooth profile of double-pitch time-sharing meshing silent conveyor chain arerectified. For actual situation of project, the tension device, which is applied fordouble-pitch time-sharing meshing silent conveyor, is designed.The meshing theory of double-pitch time-sharing meshing silent conveyor chainsystem is researched systematically, and the tension side meshing process of double-pitchtime-sharing meshing silent conveyor chain is divided into three stages: the mesh betweenconvex internal tooth profile and chain wheel as chain wheel rotates, the mesh externaltooth profile that is converted to adjacent chain link, and mesh positioning of middle toothprofile. The hypothetical coordinate system of double-pitch time-sharing meshing silentconveyor chain is established, which uses coordinate transformation theory to carry out themathematical modeling of one mesh cycle in the tension side meshing process ofdouble-pitch time-sharing meshing silent conveyor chain system. The change of speed andacceleration of double-pitch time-sharing meshing silent conveyor chain system andmathematical modeling of chain load of double-pitch time-sharing meshing silent conveyorunder different conveying mode through the analysis of kinematics and dynamics ofdouble-pitch time-sharing meshing silent conveyor chain system. The tension side ofdouble-pitch time-sharing meshing silent conveyor chain is simplified to a group ofdiscrete mass system connected by massless chord line to find the natural frequency oftension side of double-pitch time-sharing meshing silent conveyor chain system.Solid modeling is established according to the design parameters of chain ofdouble-pitch time-sharing meshing silent conveyor chain and the chain wheel with straighttooth profile of double-pitch time-sharing meshing silent conveyor chain, and kinematicalmodeling and meshing impact modeling of double-pitch time-sharing meshing silentconveyor chain system are established, which simulates the meshing process ofdouble-pitch time-sharing meshing silent conveyor chain system dynamically, andcompares the double-pitch time-sharing meshing silent conveyor chain with double-pitchroller conveyor chain, and the simulation result shows that the fluctuation of tension sidechain of double-pitch time-sharing meshing silent conveyor chain system is reduced59%,and the instant contact force is only51.9%of double-pitch roller conveyor chain system’sinstant contact force.Comparison experiment is carried out to compare the noise and wear elongation ofdouble-pitch time-sharing meshing silent conveyor chain system and double-pitch rollerconveyor chain system by using closed force flow chain experiment table. The experimental result shows that compared with double-pitch roller conveyor chain system,when rotating speed is200rpm and load is2kN, the noise of double-pitch time-sharingmeshing silent conveyor chain is reduced2dB, with the increase of rotating speed, thevalue of noise is obviously increased, and when rotating speed is300rpm and load is2kNin250hours wear elongation experiment, the result shows that the is only46%ofdouble-pitch roller conveyor chain system, therefore, the reliability and environmentalfriendliness of chain conveyor is increased by the double-pitch time-sharing meshing silentconveyor chain system.According to the research production to apply for a patent of invention,“double-pitchtime-sharing meshing silent chain”.patent No.:201110233079.9; notice of authorizationnumber: CN102287483B.In this paper, the research on chain conveyor is carried out with the fund and supportfrom chain drive system for reducing the noise, which is the subproject of CDX01projectof National General Equipment Department, and the design method of double-pitchtime-sharing meshing silent conveyor chain system is proposed on the basis of furtherresearching the meshing theory of double-pitch time-sharing meshing silent conveyor chain,and design, calculation, emulation analysis and experimental research are carried out inregard to double-pitch time-sharing meshing silent conveyor chain system with15.875mmsingle pitch and45teeth.