A stirring paddle

Abstract

The utility model discloses a water drop type stirring paddle suitable for powder coating and plastic industry, including paddle shaft and water drop shape paddle blade unit, and the paddle blade unit section is the streamline structure of before wide narrow, and is installed on the paddle shaft with paddle shaft radial parallel, the utility model discloses through optimizing the paddle blade profile, reduces material flow resistance, strengthens axial and radial mixing effect, improves mixing evenness and reduces energy consumption, and mirror surface polishing surface can protect material and facilitate cleaning, is suitable for the stirring mixing of high viscosity powder and heat sensitive plastic, has remarkable economic benefit and practicality.

Description

Technical Field

[0001] This utility model relates to the field of mixing equipment technology, and in particular to a water droplet-type mixing paddle suitable for the powder coating and plastics industries. Background Technology

[0002] In the production processes of powder coatings and plastics, mixing is one of the key steps. The structure of the mixing components directly affects the uniformity of materials, reaction efficiency, and final product quality. Existing mixing impellers mostly adopt traditional paddle, turbine, or anchor structures, which have the following problems: 1. Low mixing efficiency: Traditional paddles are not powerful enough to push high-viscosity powders or granular materials, which can easily lead to local accumulation or dead zones in the mixing, resulting in uneven mixing of materials and requiring longer mixing time.

[0003] 2. High energy consumption: To achieve the ideal mixing effect, the stirring speed needs to be increased, which increases the energy consumption and operating cost of the equipment.

[0004] 3. Risk of material damage: Some blades have sharp edges or excessive structural rigidity, which may cause mechanical damage to heat-sensitive plastic particles or easily broken powder coatings during high-speed mixing, affecting product performance.

[0005] 4. Difficult to clean: The complex blade structure makes it easy for material residue to remain, especially when changing the type of material. Incomplete cleaning can easily lead to cross-contamination.

[0006] Therefore, there is an urgent need for a new type of mixing paddle structure that can balance mixing efficiency, energy consumption control, material protection, and ease of cleaning. Summary of the Invention

[0007] This invention provides a water droplet-type mixing paddle with optimized structure, high efficiency and energy saving, and strong adaptability to solve the problems of uneven mixing, high energy consumption, easy material damage and difficult cleaning that exist in the application of existing mixing paddles in the powder coating and plastics industries.

[0008] To solve the above problems, the technical solution adopted by this utility model is as follows: An agitator, comprising a shaft and blade units distributed circumferentially along the shaft, is characterized in that: The blade unit includes a transverse blade fixed at one end to the blade shaft, and a longitudinal blade disposed at the other end of the transverse blade. Both the transverse and longitudinal blades have teardrop-shaped cross sections, including a head section, two side waist sections, and a tail section. The head section is a semi-circular structure with a radius of R1, the two side waist sections are symmetrically tapered structures along both sides of the head section, and the tail section is a semi-circular structure with a radius of R2, where R1 > R2.

[0009] Furthermore, the two waist sections are straight sections.

[0010] Furthermore, the head section radius R1 of the transverse blade and the longitudinal blade is 10-30mm, the tail section radius R2 is 1-10mm, the maximum width of the two side waist sections is W=15.53-57.96mm, and the length is L=33.21-89.85mm.

[0011] Furthermore, the two waist segments are transition arc segments.

[0012] Furthermore, the longitudinal blade and the transverse blade are vertically connected, and the longitudinal blade is positioned above the transverse blade.

[0013] Furthermore, the longitudinal blades and the transverse blades are connected at an angle greater than 90 degrees, which is a non-perpendicular connection.

[0014] Furthermore, the transverse blades of the blade unit are radially parallel to the blade shaft.

[0015] Furthermore, the outer surface of the blade unit is mirror-polished.

[0016] Furthermore, the surface roughness Ra of the blade unit is ≤0.8μm.

[0017] Furthermore, the number of blade units is three, which are evenly distributed along the circumference of the blade shaft.

[0018] Compared with the prior art, the stirring paddle of this utility model has the following beneficial effects: 1. High-efficiency mixing: The blade unit adopts a combination of transverse blades and longitudinal blades. The transverse blades push a large amount of material to form an axial flow, while the radial blades generate local turbulence. The teardrop-shaped streamline structure reduces material flow resistance, enhances radial mixing, eliminates stirring dead zones, and improves mixing uniformity by 20%~30%.

[0019] 2. Energy saving and consumption reduction: The streamlined design reduces fluid resistance, resulting in a 15% to 25% reduction in energy consumption for the same stirring effect.

[0020] 3. Material protection: The mirror-polished surface reduces material adhesion, and the rounded edges avoid mechanical damage. It is especially suitable for heat-sensitive plastics and fragile powder coatings, reducing the material breakage rate to below 5%.

[0021] 4. Easy to clean: The surface is free of complex grooves, and the polished surface and rounded corners make it easy to rinse, reducing cleaning time by 40% and lowering the risk of cross-contamination. Attached Figure Description

[0022] Figure 1 Example 1: A schematic diagram of a droplet-type stirring paddle structure suitable for mixing powder coatings; In the diagram, 1 is the propeller shaft, 2 is the propeller blade unit, 11 is the transverse blade, 12 is the longitudinal blade, 21 is the head section, 22 is the side waist sections, and 23 is the tail section. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] Example 1 This embodiment relates to a teardrop-shaped stirring impeller suitable for mixing powder coatings, including an impeller shaft 1 and impeller units 2. The impeller shaft 1 is used to weld and fix to the stirring shaft. There are 3 impeller units 2, and the 3 impeller units 2 have the same structure and are distributed circumferentially along the impeller shaft 1. Each impeller unit 2 includes a transverse impeller 11 connected to the impeller shaft 1 at one end, and a longitudinal impeller 12 vertically welded above the other end of the transverse impeller 11. The cross-section of the transverse impeller 11 and the longitudinal impeller 12 is a teardrop-shaped flat sheet, including a head section 21, two side waist sections 22 and a tail section 23 connected in sequence.

[0025] In this embodiment, the transverse blade 11 and the longitudinal blade 12 have the same cross-sectional shape. The head section 21 is a semi-circular structure with a radius R1=30mm, the tail section 23 is a semi-circular structure with a radius R2=10mm, and the two waist sections 22 are symmetrically tapered structures along both sides of the head section.

[0026] In this embodiment, the outer surface of the blade unit 2 is mirror polished, and its surface roughness Ra≤0.8μm.

[0027] In the powder coating mixing test, the stirring paddle of Example 1 was used to continuously mix and stir for a predetermined time at a certain speed. The results, measured by a colorimeter, showed that the material uniformity was improved by 28% and the energy consumption was reduced by 22% compared to the traditional paddle.

[0028] Example 2 This embodiment relates to a teardrop-shaped stirring paddle suitable for mixing plastic particles, including a paddle shaft 1 and three blade units 2. The paddle shaft 1 is fixedly connected to a stirring shaft. The three blade units 2 have the same structure and are distributed circumferentially along the paddle shaft 1. Each blade unit 2 consists of a transverse blade 11 and a longitudinal blade 12. The inner end of the transverse blade 11 is fixed to the paddle shaft 1, and the longitudinal blade 12 is connected above the far end of the transverse blade 11. The cross-section of the longitudinal blade 12 is a teardrop-shaped flat sheet, including a head section 21, two side waist sections 22 and a tail section 23 connected in sequence.

[0029] In this embodiment, the head section 21 of the transverse blade 11 and the longitudinal blade 12 is a semi-circular structure with a radius R1 = 10 mm, the tail section 23 is a semi-circular structure with a radius R2 = 1 mm, and the two waist sections 22 are symmetrically tapered structures along both sides of the head section.

[0030] In this embodiment, the outer surface of the blade unit 2 is mirror polished, and its surface roughness Ra≤0.8μm.

[0031] In the plastic granule mixing test, the stirring paddle of Example 2 was used to stir for a period of time at a certain speed. It was measured that the breakage rate of PE granules was only 2.3%, and the cleaning time was reduced by 45%.

[0032] Example 3 The difference between this embodiment and Embodiment 1 is that each blade unit 2 includes a transverse blade 11 connected to the blade shaft 1 at one end, and a longitudinal blade 12 connected above the other end of the transverse blade 11, wherein the included angle between the longitudinal blade 12 and the transverse blade 11 is greater than 90 degrees.

[0033] The longitudinal blade 12 has a teardrop-shaped flat cross section and includes a head section 21, two side waist sections 22 and a tail section 23 connected in sequence. The two side waist sections are transition arc sections.

[0034] This utility model is not limited to the embodiments discussed above. The above description of specific embodiments is intended to describe and illustrate the technical solutions involved in this utility model. Obvious variations, substitutions, or combinations based on the teachings of this utility model should also be considered to fall within the protection scope of this utility model. The above specific embodiments are used to disclose the best implementation method of this utility model, so that those skilled in the art can apply various embodiments and alternative methods of this utility model to achieve the purpose of this utility model.

Claims

1. A stirring impeller, comprising an impeller shaft and impeller blade units distributed circumferentially along the impeller shaft, characterized in that: The blade unit includes a transverse blade fixed at one end to the blade shaft, and a longitudinal blade disposed at the other end of the transverse blade. Both the transverse and longitudinal blades have teardrop-shaped cross sections. The transverse blade and the longitudinal blade include a head section, two side waist sections and a tail section. The head section is a semi-circular structure with a radius of R1, the two side waist sections are symmetrically tapered structures along both sides of the head section, and the tail section is a semi-circular structure with a radius of R2, where R1 > R2.

2. The stirring paddle as described in claim 1, characterized in that, The two waist sections are straight sections.

3. The stirring paddle as described in claim 2, characterized in that, The head section radius of the transverse and longitudinal blades is R1=10-30mm, the tail section radius is R2=1-10mm, the maximum width of the two side waist sections is W=15.53-57.96mm, and the length is L=33.21-89.85mm.

4. The stirring paddle as described in claim 2, characterized in that, The two waist sections are transitional arc sections.

5. The stirring paddle as described in claim 1, characterized in that, The longitudinal blade and the transverse blade are vertically connected, and the longitudinal blade is positioned above the transverse blade.

6. The stirring paddle as described in claim 1, characterized in that, The longitudinal blades and the transverse blades are connected at an angle greater than 90 degrees, which is a non-perpendicular connection.

7. The stirring paddle as described in claim 1, characterized in that, The transverse blades of the blade unit are radially parallel to the blade shaft.

8. The stirring paddle as described in claim 1, characterized in that, The outer surface of the blade unit is mirror polished, with a surface roughness Ra≤0.8μm.

9. A stirring paddle as described in claim 1, characterized in that, The number of blade units is 3, which are evenly distributed along the circumference of the propeller shaft.

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