Negative-stiffness and longitudinal-axial-flow threshing cylinder of combined harvester

Abstract

The invention provides a negative-stiffness and longitudinal-axial-flow threshing cylinder of a combined harvester. The negative-stiffness and longitudinal-axial-flow threshing cylinder structurally comprises a longitudinal-axial-flow and negative-stiffness cylinder body, a cylinder top cover, a threshing rack, a concave grid and the like and is characterized in that spoke disc positioning sleeves on the longitudinal-axial-flow and negative-stiffness cylinder body are positioned on a cylinder shaft through key grooves, a middle spoke disc and a tail spoke disc are positioned on the spoke disc positioning sleeves through corresponding holes, and then spokes are welded and fixed to a middle positioning plate and a tail positioning plate and form bow shapes along an axial direction to allow the longitudinal-axial-flow cylinder to have a negative-stiffness feature. The negative-stiffness and longitudinal-axial-flow threshing cylinder has the advantages that the negative-stiffness and longitudinal-axial-flow threshing cylinder is applicable to various longitudinal-axial-flow paddy rice combined harvesters and can satisfy the efficient threshing requirements of paddy rice with different features; by the longitudinal-axial-flow and negative-stiffness cylinder body, the tangential stress of the cylinder spokes and spoke bending and deformation during paddy rice threshing can be balanced, and the difficulty of random dynamic load vibration, caused by stalks, of the cylinder during threshing can be solved effectively.

Description

technical field [0001] The invention relates to the technical field of combine harvesters, in particular to a negative rigidity longitudinal axial flow threshing drum of a combine harvester. Background technique [0002] When the combine harvester threshing drum adopts the longitudinal arrangement (that is, the longitudinal axial flow drum), the length of the longitudinal axial flow drum is not limited by the space, which greatly improves the threshing separation function and operating efficiency. However, when the long vertical axial flow drum rotates at high speed, there are radial centrifugal force and unbalanced resistance on the shaft. The longitudinal axial flow drum is prone to elastic deformation and rubbing, which seriously affects the rice threshing performance and structural stability of the vertical axial flow drum. During the rice threshing process of the vertical axial flow drum, because the resistance at the front end of the drum is greater than that at the ta...

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Problems solved by technology

[0004] The existing longitudinal axial flow drum cannot solve the problem of bending deformation and vibration caused by random dynamic load excitation in the threshing process. The present invention adopts a negative stiffness structure to optimize the dynamic Deformation, the designed vertical axial flow negative stiffness drum solves the effect of the variable quality threshing process caused by the continuous separation of grains formed by the longitudinal axial flow drum during the threshing process, resulting in uneven deformation and vibration of the spokes of the longitudinal axial flow drum. And during the threshing process of the longitudinal axial flow drum, the spokes are constrained by the winding of rice stalks, which makes the radial deformation of the longitudinal axial flow drum excited by random dynamic load and the friction problem with the concave plate screen

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