Trigonometric function curved generatrix type spiral blade based on laser additive technology and forming method

Abstract

The invention relates to a trigonometric function curved generatrix type spiral blade which comprises a spiral blade body and a spiral shaft, and the spiral blade body is formed and manufactured at a time through the laser additive manufacturing technology. In the prior art, when a straight generatrix type spiral blade conveys materials, energy consumption is large, and abrasion is serious. According to the method, a blade generatrix form is changed into a trigonometric function curved generatrix form from a traditional straight generatrix form, and a function relational expression # imgabs0 # is obtained by fitting a trigonometric function. And value intervals of the amplitude, the angular frequency and the phase are given. The spiral blade forming device is reasonable in design, the conveying efficiency can be improved, energy consumption can be reduced, normal impact and tangential abrasion of materials to the blade are greatly reduced, the spiral blade is formed at a time through the laser additive manufacturing technology, the manufacturing difficulty is reduced, and the forming precision is improved.

Description

Technical Field

[0001] The present invention belongs to the field of conveying mechanical equipment, and in particular relates to a trigonometric function curved generatrix-shaped spiral blade based on laser additive technology and a forming method thereof. Background Art

[0002] Screw conveyors, due to their efficient conveying capabilities, are widely used in various sectors of the national economy, including the grain, building materials, chemical, machinery, and transportation industries. The operating principle of a screw conveyor is to lift particles vertically through contact forces between adjacent particles and friction between the particles and the pipe wall. Blade wear and high conveying energy consumption are unavoidable issues with screw conveyors.

[0003] As the core component of the vertical screw conveyor, the spiral blade has a busbar form including a straight busbar type and a curved busbar type. Due to the limitations of the manufacturing method, the busbar form of most existing spiral blades is usually a straight line type, and the manufacturing process has insufficient forming accuracy. There are usually errors in the contour of the cold-rolled formed blades, and welding deformation will cause coaxial deviation, which directly affects the conveying efficiency of the screw conveyor. The efficiency of the curved busbar spiral blade is higher than that of the straight busbar type, but it is difficult to manufacture. The Chinese patent with publication number CN107140389A provides a forming method for curved busbar spiral blades, which requires multiple limited-angle welding to complete. Combined with the severe wear of the blades during material transportation, the high-cost processed curved busbar spiral blades are often too expensive and cannot meet the user's needs.

[0004] With the rapid development of laser additive technology, it has become possible to directly manufacture digital models into physical parts, which provides the possibility for in-depth research on curved busbar spiral blades. Summary of the Invention

[0005] The purpose of the present invention is to provide a trigonometric function curved generatrix type spiral blade, the generatrix form of the spiral blade is a trigonometric function type, which can effectively improve the conveying efficiency, reduce energy consumption, reduce wear and tear, and increase the service life of the screw conveyor.

[0006] Another object of the present invention is to provide a method for forming the above-mentioned trigonometric function generatrix-shaped spiral blade.

[0007] To achieve the above object, the technical solution adopted by the present invention is a trigonometric function curved generatrix spiral blade, comprising a spiral shaft and a spiral blade, wherein the spiral shaft and the spiral blade are formed at one time by using laser additive manufacturing technology, and the generatrix form of the spiral blade satisfies the trigonometric function relationship: , where A is the amplitude, is the frequency, is the phase, is the intercept.

[0008] The amplitude A satisfies (0, ], angular frequency coefficient , phase ,intercept .

[0009] A method for forming a trigonometric function generatrix-shaped spiral blade comprises the following steps: a) Digital modeling, build a digital model of the spiral blade, the generatrix form of the spiral blade satisfies the trigonometric function relationship, Among them, the amplitude A of the trigonometric function curve satisfies (0, ], angular frequency coefficient , phase ,intercept . And modeling is carried out in combination with the required dimensions; b) Use the laser metal direct structuring system (LMDF) to complete laser additive manufacturing.

[0010] The trigonometric function curved generatrix spiral blade of the present invention greatly reduces the normal impact and tangential wear of the material on the blade while improving efficiency, greatly improving the overall service life of the spiral blade, and by using laser additive manufacturing technology to form the spiral blade in one step, the manufacturing difficulty is reduced and the forming accuracy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 It is a schematic diagram of the overall structure of the trigonometric function generatrix spiral blade;

[0013] Figure 2 This is a partial enlarged view of the spiral blade;

[0014] Figure 3 Schematic diagram comparing the trigonometric function curved generatrix and the traditional straight line generatrix. DETAILED DESCRIPTION

[0015] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

[0016] like Figure 1As shown, a trigonometric function curved generatrix spiral blade includes a spiral shaft and a spiral blade. The spiral shaft and the spiral blade are formed at one time by using laser additive manufacturing technology. The generatrix of the spiral blade satisfies the trigonometric function relationship: , where A is the amplitude, ω is the frequency, φ is the phase, and a is the intercept.

[0017] According to the shape of the generatrix and the law of function change, the trigonometric function generatrix is ​​a positive number, so the numerical value in the function relationship is The slope of the trigonometric function type curve should not be too large. (0, ]. The inner and outer diameters of the spiral blades are one cycle of the trigonometric function, so the angular frequency , and the inner and outer diameters of the blade are at the beginning and end of a cycle of the function respectively. The trigonometric function is a concave function image at the inner and outer diameters of the blade. Since the first cycle of the cosine function is a concave function, the phase .

[0018] like Figure 2 As shown, after the particles enter the screw conveyor, they will move toward the edge of the spiral blade 1 under the action of the centrifugal force of the spiral shaft 2. There is a changing inclination angle between the spiral blade of the present application and the horizontal plane, and this inclination angle tends to first increase and then decrease and is a continuous smooth curve. It can reduce the normal impact of the gravity of the accumulated particles on the spiral blade 1 to a certain extent, and can also avoid the impact of the centrifugal force component caused by the excessive inclination angle at the edge of the spiral blade 1.

[0019] like Figure 3 As shown, when the conveyor is working, the free surface formed by the particles on the spiral blade 1 is very close to its spiral surface. The free surface formed by the particles on the spiral blade of the present application is large. The larger the free surface, the greater the degree of accumulation of the particles at the edge of the blade 1; the lifting of the particles is mainly driven by the friction between them and the pipe wall. The greater the degree of accumulation, the larger the contact area between the particles and the pipe wall, and the higher the conveying efficiency.

Claims

1. A trigonometric function generatrix spiral blade, characterized in that: It comprises a spiral blade (1) and a spiral shaft (2), and is characterized in that the generatrix of the spiral blade is in a trigonometric function form.

2. The spiral blade according to claim 1, wherein the generatrix form satisfies the following functional relationship: .in, A is the amplitude, ω is the frequency, φ is the phase, and a is the intercept.

3. The trigonometric function relationship according to claim 2, wherein: The amplitude coefficient in the above relationship satisfies: (0, ], the angular frequency coefficient satisfies: , the phase satisfies: , the intercept satisfies 4. A method for forming a trigonometric function curved generatrix spiral blade, wherein the spiral shaft and the spiral blade are formed in one step by using laser additive manufacturing technology.

5. A digital model of the spiral blade is established according to the trigonometric function relationship described in claim 3, and modeled in combination with the required dimensions.

6. The model according to claim 5 is manufactured by laser additive manufacturing using a laser metal direct structuring (LMDF) system.

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