Rotary flexible shaft supporting tube with support blades having single-node elliptical-annular sections

Abstract

The invention relates to a rotary flexible shaft supporting tube with support blades having single-node elliptical-annular sections, which comprises an inner tube body and three or more support blades. The three or more support blades are integrally arranged on the outer wall surface of the inner tube body; the inner tube body has a circular tube shape; the support blades on the outer wall surface of the inner tube body extend along the length direction of the inner tube body; the section of each support blade is annular, and the outer wall of each support blade has an elliptic cylinder shape; an inner hole of each support blade is tangential to the outer wall surface of the inner tube body; the wall thickness of each support blade is less than that of the inner tube body; the distances from the top parts of all support blades to an axis of the inner tube body are the same; and in the section of the inner tube body and the support blades, central lines of the support blades are arranged along the radial direction of the inner tube body. The rotary flexible shaft supporting tube has the advantages of effectively avoiding following rotation, reducing vibration, reducing noise pollution, preventing the rotary flexible shaft from being blocked, improving the work efficiency, prolonging the service life, and improving the operational comfort after being assembled and used.

Description

technical field [0001] The invention relates to a rotating flexible shaft supporting pipe, in particular to a rotating flexible shaft supporting pipe with single-node elliptical ring supporting blades in section. Background technique [0002] In lawnmowers and scarifiers in the field of plant protection machinery, support tubes must be used to support the rotating flexible shaft for power transmission. During use, the support tubes are inserted into the lumen of the metal outer casing. Ensure the coaxial (concentric) rotation state of the rotating flexible shaft and the metal outer tube in the support lumen, which can minimize the friction and noise when the rotating flexible shaft rotates, reduce the damage of the flexible shaft and the supporting tube, and realize the transmission of power. The loss is minimal. [0003] At present, a general support tube is mainly composed of an inner tube body and support vanes fixedly arranged on the outer wall of the inner tube body. T...

AI Technical Summary

Problems solved by technology

During installation, in order to ensure the stable insertion of the support tube in the metal outer sleeve, the distance between the outer end of the support blade and the center of the inner tube body is slightly larger than the inner diameter of the metal outer sleeve, so that the installed support tube can be firmly fixed on the outer sleeve. In the tube, due to the uneven deformation of the support blades, the deformation of the lumen in the support tube or the large degree of axis deviation

When the rotating flexible shaft rotates at high speed in the lumen of the support tube, the heat generated by the rotating flexible shaft rubbing against the inner wall of the support tube lumen will heat up the support tube, and the expansion of the support tube body will push the inner wall of the metal outer sleeve outward through the force transmitted by the support blades. Due to the high strength of the metal sleeve, the support blades cannot cause the metal outer sleeve to deform outward to eliminate the pressure, so the support blades can only squeeze the lumen wall of the support tube inward, resulting in deformation of the lumen of the support tube, and continue to rotate at high speed The rotating flexible shaft of the rotating shaft continues to rub against the deformed tube wall, which makes the friction of the inner tube body greater, resulting in the rotation of the support tube, wear of the tube cavity, and increased noise (the noise generated by the friction between the blade of the support tube and the metal outer sleeve is harsh), and Tremors are generated, which reduces the operating comfort and also produces noise pollution; while the deformed inner lumen or the inner lumen that deviates from the axis during installation of the support tube aggravates the adverse consequences from the very beginning

Although the later technologies improved the structure of the supporting blades to reduce the degree of deformation of the lumen, due to the thinness of the supporting blades, the axial center of the lumen of the supporting tube shifted and deviated from the concentricity during installation, especially at the elbow of the metal outer sleeve. The increase of the roundness will also change the state of the coaxial rotation of the rotating flexible shaft, resulting in increased wear, noise, and power loss

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