Concrete mixer helical blade design method based on equal changeable angle helical curve

Abstract

The invention discloses a concrete mixer helical blade design method based on an equal changeable angle helical curve, which comprises the following steps of: based on three-dimensional software, programming by using expressions to obtain blade root and top helical curves on various sections of a tank body, making a front taper blade vertical to a generatrix of the tank body, and making middle cylinder and rear taper blades vertical to the axis of the tank body; fitting the mutually connected helical curves to obtain two C3-continuous curves; newly construction a helical curve by using two helical curves, and obtaining another blade different by 180 degrees through an array; programming to obtain a user interface, wherein the interface contents comprise a rear taper small-end helical angle, a rear taper large-end helical angle, a front taper large-end helical angle, and a blade height; and inputting corresponding parameters according to prompt of the user interface to complete the blade design. By adopting the helical curves designed by the method, helical angles of helical curves of tapered sections and cylindrical sections of the tank body at connecting positions can be controlled according to given functional relation change, so that the variation trends of the helical curves are same.

Description

technical field [0001] The invention relates to a design method for a helical blade of a concrete mixer truck based on an equal-angle helix among mechanical components, and belongs to the field of machinery. Background technique [0002] The design theory of the helical blade of the concrete mixer holds that, for the blade profile of the conical section, when the helix angle at the top of the blade at the large end of the cone is selected, in order to improve the discharge performance at the small end of the conical section, the helix angle should be appropriately larger than the helix at the large end. Angle, so that its working point is lower; the realization method is to introduce the concept of calculation cone, use logarithmic helix on the calculation cone, and then get the inner wall helix of the tank (that is, the blade shape line), and point out the helix of the inner wall of the tank. The change in angle is approximately linear. However, since this method does not ...

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Problems solved by technology

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a design method for the helical blade of a concrete mixer truck based on an equal-angle helix, to solve the problem of single processing methods in the prior art, and to improve labor efficiency. It is safe and environmentally friendly, saves man-hours, and can control the helix angle of the helix of the tank cone and column at the junction, so that the change trend of the helix is ​​the same, and the helical blade is smoother, which is conducive to improving the mixing performance and discharge performance.

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