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

A technology of concrete mixer truck and variable angle screw, applied in the field of machinery, can solve problems such as single

Inactive Publication Date: 2011-07-20
QINGTE GRP
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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 effici...

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

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Embodiment Construction

[0023] A method for designing the helical blade of a concrete mixer truck based on an equal-angle helix, comprising the following steps:

[0024] (1) Establish the correct helical curve of the blade root and the blade top, and the blade root shape line equation is:

[0025] When β is a variable and changes linearly with θ, β can be expressed as:

[0026] β = β 1 + ( β 2 - β 1 ) θ θ max

[0027] In the formula, r is the radius of the cylinder, β is the helix angle, θ is the helix rotation angle, θ max Maximum Helix Angle

[0028] Then the equation of the constant-angle helix of the conical segment is:

[0029] x = ...

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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 ...

Claims

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Application Information

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IPC IPC(8): B28C5/42
Inventor 纪爱师纪建奕李守欣郑招强
Owner QINGTE GRP
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