Transmission Design And Application Into Knotter Of Arbitrary Crossed-axis Bevel Gear

The knotter is the core component of the square bale baler.Its spatial structure is more complicated.The modeling of knotters at various domestic scientific research institutes and colleges is in the scanning and reconstruction stage.In particular,the cross-axle bevel gear transmission mechanism is a space transmission mechanism,and the reconstruction model is not accurate,resulting in reduced transmission accuracy and stability.The accurate modeling of the interleaved bevel gear pair in the knotter ensures the transmission thereof.Accurate and stable and low-cost manufacturing has important research significance and application value.The thesis analyzes the parametric calculation model of any interleaved bevel gear pair in detail,deduces the mathematical model of the tooth surface of the bevel gear,solves the D-type knotter-clamped rope-disk bevel gear pair and the double-toothed-disk-cable knotter and knots the bevel gear The relevant parameters of the auxiliary set up its mathematical model and three-dimensional model of the tooth surface.The three-dimensional model of the bevel gear was established and the meshing transmission simulation and finite element analysis were carried out.The physical prototype and knot test were also carried out.The main research content of this article is as follows:(1)Parametric Calculation Model and Analysis of Arbitrary Interlaced Axle-Bevel Gear Pairs:In this paper,the parameter calculation models of two general alternating-axle bevel gear pairs are introduced in detail,and their advantages and disadvantages in the application process are analyzed.A D-type knotter is set up with a cross-shaft 98° bevel gear pair and a double tooth plate.The geometric parameter calculation model of the 98° bevel gear pair of the cross-knots of the knotter is used to provide parameter support for the establishment of the precise three-dimensional model.(2)Derivation of Mathematical Model of Bevel Gear Tooth Surface and 3D Modeling:This paper deduces the mathematical model of the bevel gear tooth surface based on the gear meshing principle,and uses MATLAB to solve the tooth surface mathematical model to obtain the point set of the tooth surface represented by the mathematical model of the bevel gear.Based on the data interface of MATLAB and Pro/E,the set of desired tooth surface points was imported into Pro/E,and the 3D modeling was performed according to the “point-line-surface-body” rule,and a D-type knotter clamping rope plate was established.Three-dimensional model of intersecting shaft and bevel gear pair of cross shaft bevel gear pair and double tooth chain knotter.(3)Simulation of Cross-Connected Axle-Bevel Gear Pair Drive of Knotter and Analysis of Tooth Error:In the ADAMS software,the meshing of the three-dimensional model of the interleaved bevel gear pair was simulated and analyzed.The design was verified with the rotating attitude of the rope-clamping disc with the D-type knotter and the rotating attitude of the knotted ring with the double-toothed-circular knotter.The accuracy of the bevel gear pair transmission.The subjective error and objective curvature radius error analysis of the knot-connected large bevel gear tooth profile established by scan reconstruction and computational design were performed.Based on the static analysis module of ANSYS,static finite element analysis was performed on the beveled bevel gear pair.The results showed that the safety factor was greater than 1.(4)Casting and Knotting Test of Knotted Bevel Gear Pair of Bracelet Knotter: In order to reduce the production cost of the knotter,the small bevel gear is cast separately using the method of precision casting,and the incomplete large bevel gear and the large tooth plate are cast as one body.The assembled bevel gear pair was assembled on the double tooth gear knotter to perform knotting test.The knotting ratio was used as the test index.The rope tension and the spindle speed were used as experimental factors to perform the knotting tester.In the knot test,the results of the test with 6,000 knots were analyzed.The results show that the knotter drive is accurate and stable.