Double-spiral mixer for powder coating

Abstract

The utility model discloses a double-helix mixer for powder coating. The double-helix mixer comprises a mixing bin and a rotating shaft, the two rotating shafts are arranged in the mixing bin in parallel, and stirring plates are arranged on the rotating shafts in the circumferential direction and used for mixing powder coating; the stirring plates are equidistantly arranged on the side wall of the rotating shaft along a spiral path; the stirring plates on the two rotating shafts are arranged in a staggered manner, and the adjacent stirring plates are equidistant; the adjacent stirring plates are at least partially crossed and overlapped. According to the utility model, the rotating shaft capable of rotating oppositely is arranged in the mixing bin, and the powder coating in the mixing bin can be uniformly stirred and mixed through the stirring plates arranged on the rotating shaft in a staggered manner, so that the powder coating is paved in the mixing bin as required, and uniform dispersion of powder coating particles is realized; and the thickness of a powder coating paving layer after paving is completed can be controlled, so that the situation that part of powder coating is deposited at the bottom of the coating in a mixing bin due to gravity in the preparation process of the composite material, and consequently the coating is distributed unevenly is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of material processing equipment, in particular to a double-screw mixer for powder coatings. Background Art

[0002] Thermosetting powder coating refers to a coating with thermosetting resin as the main film-forming substance. When this coating is cured, the film-forming substance in the coating becomes a hard, insoluble and infusible polymer network structure through cross-linking and other reactions. The main varieties include amino alkyd coating, thermosetting acrylic coating, epoxy resin material, polyester coating and polyurethane coating.

[0003] In the prior art, in order to improve the uniformity of powder coating sprayed onto the surface of the workpiece, it is often necessary to premix the powder coating before it enters the spray gun. Among the existing mixing equipment, the one with better powder transportation and mixing effects is usually a horizontal double-screw ribbon mixer, which has a feed port, a discharge port, a U-shaped container, a transmission main shaft and a spiral ribbon fixed on the transmission main shaft. The spiral ribbon stirs and pushes the powder to achieve uniform mixing of the materials. The materials in the existing spiral ribbon mixer form axial motion in the mixing chamber. The mixed solid materials are pushed axially by the spiral ribbon and are easily squeezed into blocks. The materials cannot be interlaced in the middle, resulting in uneven mixing and poor mixing efficiency.

[0004] Therefore, it is necessary to provide a double-screw mixer for powder coatings to solve the problem that the existing powder mixing equipment cannot effectively mix the powders evenly, thereby reducing the uniformity of coating spraying. Utility Model Content

[0005] The utility model aims to provide a double-screw mixer for powder coatings to solve the technical problems raised in the background technology.

[0006] In order to solve the above technical problems, the utility model specifically provides the following technical solutions:

[0007] The utility model provides a double-helix mixer for powder coatings, comprising: a mixing bin; a rotating shaft, wherein two of the double-helix mixers are arranged in parallel in the mixing bin, and stirring plates are arranged circumferentially on the rotating shafts for mixing the powder coatings; wherein the stirring plates are arranged equidistantly along a spiral path on the side wall of the rotating shaft; the stirring plates on the two rotating shafts are arranged staggered with each other, and adjacent stirring plates are equidistant; and adjacent stirring plates are at least partially crossed and overlapped.

[0008] Furthermore, a through groove is formed on the stirring plate near its end; wherein the through groove is formed along the axis of the rotating shaft to form a groove wall inclined to the plate surface of the stirring plate in the through groove.

[0009] Furthermore, the width of the through groove gradually decreases from the end of the stirring plate to the rotating shaft.

[0010] Furthermore, a rubber sleeve is provided on the stirring plate for closing the through groove; wherein an embedding groove is opened on the stirring plate, and the end of the rubber sleeve is embedded in the embedding groove; the embedding groove is arranged close to the bottom of the through groove.

[0011] Furthermore, a rubber block is arranged in the through groove; wherein the rubber block is embedded in the through groove; and an end of the rubber block protrudes from the stirring plate.

[0012] Furthermore, the ends of the rubber blocks extend toward both sides along the edge of the stirring plate to form stopper portions; wherein the ends of the stopper portions of adjacent rubber blocks on the stirring plate can abut against each other.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model provides a rotating shaft capable of counter-rotation in a mixing bin, and a stirring plate staggered on the rotating shaft so that the powder coating in the mixing bin can be stirred and mixed evenly, so that the powder coating can be paved inside the mixing bin as required, thereby achieving uniform dispersion of the powder coating particles, which is beneficial to controlling the thickness of the powder coating paving layer after paving is completed, thereby effectively avoiding that part of the powder coating will be deposited at the bottom of the coating in the mixing bin due to gravity during the preparation of the composite material, resulting in uneven distribution of the coating, thereby avoiding affecting the mechanical properties and apparent quality of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] Figure 1 A top view of a double-screw mixer for powder coatings provided by the utility model;

[0017] Figure 2 for Figure 1 The three-dimensional structure diagram of the stirring plate in the middle;

[0018] Figure 3 for Figure 2 Enlarged view of middle Ⅰ;

[0019] Figure 4 A side view of a stirring plate in another embodiment of the present invention;

[0020] Figure 5 for Figure 4 Enlarged view of middle II.

[0021] Figure 6A side view of a stirring plate in another embodiment of the present invention;

[0022] Figure 7 for Figure 6 Enlarged view of middle III.

[0023] The numbers in the figure represent the following:

[0024] 1. Mixing chamber; 2. Rotating shaft; 21. Stirring plate; 211. Through groove; 22. Rubber sleeve; 23. Embedded groove; 24. Rubber block; 241. Stopper. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1 As shown, the utility model provides a double-screw mixer for powder coatings, comprising:

[0027] Mixing bin 1;

[0028] The rotating shaft 2 is provided with two parallel shafts in the mixing chamber 1, and a stirring plate 21 is provided circumferentially on the rotating shaft 2 for mixing the powder coating;

[0029] The stirring plates 21 are arranged equidistantly along the spiral path on the side wall of the rotating shaft 2 ; the stirring plates 21 on the two rotating shafts 2 are arranged alternately, and the adjacent stirring plates 21 are equidistant; and the adjacent stirring plates 21 at least partially cross and overlap.

[0030] The utility model aims to arrange a rotating shaft 2 capable of counter-rotating in a mixing bin 1, and to stir and mix the powder coating in the mixing bin 1 evenly through stirring plates 21 staggered on the rotating shaft 2, so that the powder coating can be paved inside the mixing bin 1 as needed, thereby achieving uniform dispersion of the powder coating particles, which is beneficial to controlling the thickness of the powder coating paving layer after paving is completed, thereby effectively avoiding that part of the powder coating will be deposited at the bottom of the coating in the mixing bin 1 due to gravity during the preparation of the composite material, resulting in uneven distribution of the coating, thereby avoiding affecting the mechanical properties and apparent quality of the material.

[0031] In the above embodiment, as the powder coating is continuously pushed to both sides by the stirring plate 21 in the mixing bin 1, friction will occur between each two adjacent stirring plates 21 and the surface of the stirring plate 21 and the wall of the mixing bin 1. The powder coating in the limited space will be pushed to both sides of the mixing bin 1 as a whole by the stirring plate 21. When the powder coating clumps due to electrostatic adsorption, moisture absorption and the like, the stirring plate 21 cannot break it up in time, thereby affecting the overall mixing uniformity of the powder coating.

[0032] In order to solve the above problems, Figure 2-3 As shown, in the preferred embodiment provided by the utility model based on the above-mentioned embodiment, a through groove 211 is provided on the stirring plate 21 near its end;

[0033] The through groove 211 is opened along the axis of the rotating shaft 2 to form a groove wall inclined to the plate surface of the stirring plate 21 in the through groove 211 .

[0034] More specifically, the width of the through groove 211 gradually decreases from the end of the stirring plate 21 to the rotating shaft 2 .

[0035] In this embodiment, since the powder coating moves along the axial direction of the rotating shaft 2 under the pushing action of the stirring plate 21, and the groove wall parallel to the axial direction of the rotating shaft 2 is set in the through groove 211, the powder can repeatedly pass through the through groove 211 directly during the stirring process, and only does not collide with the groove wall of the through groove 211, so that the powder coating only generates a small supporting force and friction force on the groove wall when passing through the through groove 211, and thus the powder coating in the mixing chamber 1 can be quickly and evenly refined, and the agglomerated powder coating can also be broken up and dispersed when passing through the through groove 211, so as to avoid the appearance of a large number of agglomerates in the powder coating that affect the overall mixing uniformity of the powder coating.

[0036] In the above embodiment, due to the provision of the through grooves 211, the powder coating preferentially flows from the through grooves 211 on the stirring plate 21 when being squeezed, which reduces the thrust force of the powder coating between adjacent stirring plates 21 and affects the material conveying rate.

[0037] In order to solve the above problems, Figure 4-5 As shown, in the preferred embodiment provided by the utility model based on the above embodiment, a rubber sleeve 22 is provided on the stirring plate 21 for closing the through groove 211;

[0038] The stirring plate 21 is provided with an embedding groove 23, and the end of the rubber sleeve 22 is embedded in the embedding groove 23;

[0039] The embedding groove 23 is disposed close to the groove bottom of the through groove 211 .

[0040] In this embodiment, by arranging a rubber sleeve 22 on the stirring plate 21, the thrust force of the stirring plate 21 on the powder coating can be changed, and the elastic force generated by the rubber sleeve 22 when it is deformable can be utilized to help the powder to separate from the stirring plate 21, thereby improving the conveying efficiency; on the other hand, the rubber sleeve 22 can also protect the end of the stirring plate 21 to avoid collision and friction between it and the wall of the mixing bin 1.

[0041] In the above embodiment, the end of the stirring plate 21 is provided with the through groove 211, so that the end of the stirring plate 21 is easily deformed under the action of external force, and the deformed stirring plate 21 will affect the stirring and mixing effect.

[0042] In order to solve the above problems, Figure 6-7 As shown, in the preferred embodiment provided by the present invention based on the above-mentioned embodiment, a rubber block 24 is provided in the through groove 211;

[0043] The rubber block 24 is embedded in the through groove 211 ; the end of the rubber block 24 protrudes from the stirring plate 21 .

[0044] More specifically, the end of the rubber block 24 extends to both sides along the edge of the stirring plate 21 to form a stopper 241;

[0045] The ends of the stopper portions 241 of adjacent rubber blocks 24 on the stirring plate 21 can abut against each other.

[0046] In this embodiment, the filling effect of the rubber block 24 on the end groove 211 of the stirring plate 21 can protect the end thereof and prevent the stirring plate 21 from being deformed by external forces. At the same time, the provision of the locking portion 241 can help fix the rubber block 24 in the groove 211, further improving the stability of the rubber block 24 fixed on the stirring plate 21.

[0047] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A double screw mixer for powder coatings, characterized in that: include: Mixing bin (1); Two rotating shafts (2) are arranged in parallel in the mixing chamber (1), and stirring plates (21) are arranged circumferentially on the rotating shafts (2) for mixing powder coatings; Wherein, the stirring plates (21) are arranged at equal distances along a spiral path on the side wall of the rotating shaft (2); The stirring plates (21) on the two rotating shafts (2) are arranged alternately with each other, and the distance between adjacent stirring plates (21) is equidistant; Adjacent stirring plates (21) at least partially cross and overlap.

2. A double screw mixer for powder coating according to claim 1, characterized in that: The stirring plate (21) is provided with a through groove (211) near its end; The through groove (211) is opened along the axis of the rotating shaft (2) so as to form a groove wall in the through groove (211) that is inclined to the plate surface of the stirring plate (21).

3. A double screw mixer for powder coating according to claim 2, characterized in that: The width of the through groove (211) gradually decreases from the end of the stirring plate (21) toward the rotating shaft (2).

4. A double-screw mixer for powder coating according to claim 3, characterized in that: The stirring plate (21) is provided with a rubber sleeve (22) for sealing the through groove (211); The stirring plate (21) is provided with an embedding groove (23), and the end of the rubber sleeve (22) is embedded in the embedding groove (23); The embedding groove (23) is arranged close to the groove bottom of the through groove (211).

5. A double screw mixer for powder coating according to claim 3, characterized in that: A rubber block (24) is provided in the through groove (211); Wherein, the rubber block (24) is embedded in the through groove (211); An end of the rubber block (24) protrudes from the stirring plate (21).

6. A double screw mixer for powder coating according to claim 5, characterized in that: The end of the rubber block (24) extends toward both sides along the edge of the stirring plate (21) to form a stopper (241); Wherein, the ends of the stopper portions (241) of adjacent rubber blocks (24) on the stirring plate (21) can abut against each other.

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