JPH0938962A - Mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mix and diffuse a molding material without bonding the same to a diffusion blade when a thermosetting resin is formed. SOLUTION: A vertical mixer is constituted by providing a diffusion blade 2 performing the mixing of a powder or particles, the mixing of the powder and a liquid or granulation to the bottom surface of a mixer main body 1 and has blades 3 having an angle in the rotary direction of the diffusion blade 2. In the cross-sectional shape of the blades 3, when the thickness of the lower edge 3a preceding in an advance direction is set to A and the gap between the bottom surface of the mixing main body 1 and the lower edge 3a of each of the blades 3 is set to D, the ratio (A/D) of A to D is 3 or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixer used for producing a powder or granular thermosetting resin molding material.

[0002]

2. Description of the Related Art In order to obtain a thermosetting resin molding material, a filler such as wood powder, an additive such as a pigment and a release agent, etc. are put into a thermosetting resin and mixed and diffused. The mixer is
As shown in FIG. 5, a vertical mixer having a diffusion blade 12 on the bottom surface 4 of the mixer body 1 is generally used. To mix and diffuse the molding material, a powder or granular material is charged into a mixer and mixed while rotating the diffusion blade 12, and a liquid material is charged and mixed and diffused. Further, by rotating the blades 8 of the chopper 7 provided on the side surface of the mixer main body 1 at high speed, the mixed and diffused material is cut into particles.

[0003]

However, the molding material charged into the mixer is mixed and diffused by the rotation of the diffusion blade 12, and at that time, the molding material adheres to the blade 13 of the diffusion blade 12. If the molding material adheres to the blades 13 of the diffusion blades 12, the efficiency of mixing and diffusing decreases, and there is a possibility that uniform mixing and diffusing cannot be performed. Further, when mixing and diffusing another type of molding material, it is necessary to remove the molding material attached to the blade 13 of the diffusion blade 12.

The inventor of the present invention investigated the shape of the blade 13 of the diffusion blade 12 and the attachment point. The bottom surface 4 of the mixer body 1,
A cross section of the blade 13 of the diffusion blade 12 is shown in FIG. The arrow in the figure indicates the traveling direction of the blade 13. The diffusion blade 12 has a plate-shaped blade 13, and the cross section of the blade 13 is substantially quadrilateral. Therefore, the thickness B of the lower edge 13a of the blade 13 is
It has substantially the same thickness as the upper edge 13b. Further, when the distance between the bottom surface 4 of the mixer main body 1 and the lower edge 13a of the blade 13 is D, D is set as short as possible because the molding material does not stay at the bottom. Lower edge 13a
It was found that a large amount adhered to.

The present invention has been made in view of the above facts, and an object thereof is to provide a mixer which can mix and diffuse a molding material without adhering to a diffusion blade when a thermosetting resin is produced. To do.

[0006]

The mixer according to claim 1 of the present invention comprises a mixer main body 1 with a diffusion blade 2 for mixing powder or granules, mixing powder and liquid, and granulating. A vertical mixer provided on the bottom surface 4 of the blade 3, the blade 3 having an angle in the rotation direction of the diffusion blade 2, and the cross-sectional shape of the blade 3 of the lower edge 3a preceding the traveling direction. Assuming that the thickness is A and the gap between the bottom surface 4 of the mixer body 1 and the lower edge 3a of the blade 3 is D, the ratio of A to D (A / D) is within 3.

The above molding material is conventionally pressed between the blade and the bottom surface 4 of the mixer main body 1 and adheres to the blade, but the present invention has the above-mentioned structure and remains in the gap between the lower edge 3a of the blade 3 and the bottom surface 4. The amount of molding material used is small.

A mixer according to a second aspect of the present invention is the mixer according to the first aspect, characterized in that a water passage 5 for circulating cooling water is provided inside the blade 3.

According to the present invention, the blade 3 of the diffusion blade 2 has the above structure.
Therefore, the adhesive force of the molding material around the blade 3 decreases.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1A is a partially cutaway front view of a mixer according to a first embodiment of the present invention, and FIG. 1B is a view showing a cross section of a blade of a diffusion blade and a side surface of a mixer main body. Is a figure,
FIG. 2 is a plan view in which a part of the mixer according to the first embodiment of the present invention is cut away, and FIG. 3 shows a part of diffusion blades of the mixer according to the second embodiment of the present invention. It is sectional drawing shown.

FIG. 1 shows the first embodiment of the present invention.
A description will be given based on FIG. The mixer of the present invention is a vertical mixer in which a bottom surface 4 of a mixer body 1 is provided with a diffusion blade 2. The object to be mixed and diffused by the above mixer is a thermosetting resin molding material. Examples of the constituent material of the thermosetting resin molding material include thermosetting resins, fillers such as wood powder, and additives such as pigments and release agents. Examples of the thermosetting resin include phenol resin, melamine resin, urea resin, epoxy resin, and the like, and modified products thereof. These materials are charged through a charging port 9 provided on the ceiling surface of the mixer main body, and mixed and diffused. In order to mix and diffuse the molding material, a powder or granular material is charged into a mixer and mixed while rotating the diffusion blade 2, and a liquid material is charged and mixed and diffused. Furthermore, the mixer body 1
By rotating the blades 8 of the chopper 7 provided on the side surface of the device at high speed, the mixed and diffused material is cut into particles. Further, the side surface and the bottom surface of the mixer main body 1 are provided with a function of adjusting the temperature such as heating and cooling as necessary.

As shown in FIG. 2, the diffusion blade 2 is provided with three blades 3 on a rotating shaft 6. The blade 3 has an arbitrary angle with respect to the rotation direction, as shown in FIGS.
The lower edge 3a of the blade 3 has an inclination leading in the traveling direction. The arrow in FIG. 1B indicates the traveling direction of the blade 3. In the cross section of the blade 3 of the diffusion blade 2, the lower edge 3a of the blade 3 is thin and the upper edge 3b is thick quadrilateral.

In the present invention, the thickness of the lower edge 3a of the blade 3 is set to A, and the bottom surface 4 of the mixer main body 1 and the lower edge 3a of the blade 3 are set.
If the gap between and is D, the ratio of A to D (A / D)
Is within 3. The above molding material is pressed between the conventional blade and the bottom surface 4 of the mixer main body 1 and adheres to the blade. As described above, when the ratio of A to D (A / D) is 3 or less, the blade 3 The amount of molding material remaining in the gap between the lower edge 3a and the bottom surface 4 is small. Therefore, the molding material is unlikely to adhere to the blade 3. For example, the ratio (A / D) is preferably about 1. Further, the blade 3 having a ratio (A / D) of 0 is zero.
The shape may be a substantially inverted triangle with the lower edge 3a protruding. The gap D between the lower edge 3a of the blade 3 is 5 to 10 mm.
The degree is preferred.

Next, a second embodiment of the present invention will be described with reference to FIG. In the above mixer, a water channel 5 for circulating cooling water is further provided inside the blade 3. The rotating shaft 6 has an insertion water passage 5a on the center side and an discharge water passage 5b on the outside. This insertion channel 5a and discharge channel 5b
The water passage 5a and the discharge water passage 5b are formed in the blade 3 and are connected at the tip of the blade 3. The rotary shaft 6
The inner water channel 5 is connected to an external water source by a rotary joint, and when an external pump is operated, cooling water circulates in the water channel 5. With the above configuration, cooling water in the water channel 5,
For example, since water having a temperature of 15 to 25 ° C. can be circulated, the temperature of the blade 3 of the diffusion blade 2 can be lowered. As a result, the adhesive force of the molding material around the blade 3 decreases,
The molding material does not easily adhere to the blade 3.

As shown in FIG. 1 (a), the mixer has a chopper 7. The chopper 7 is a stirring blade 2
In addition to agitating the material charged into the mixer, the agitated molding material is cut into granules by a shearing action independent of. It is preferable that the distance S between the blade 8 of the chopper 7 and the blade 3 of the diffusion blade 2 is short because the effect of mixing and diffusion is improved. For example, the interval S is preferably 5 mm or less.

The embodiment of the present invention is not limited to the above embodiment. For example, the number of the diffusion blades 2, the presence / absence of the chopper 7, etc. are appropriately selected depending on the type of molding material. As described above, in the mixer of the present invention, the molding material does not adhere to the diffusion blade 2 when the thermosetting resin is produced.

[0017]

In the mixer according to claim 1 of the present invention, since the ratio of A to D (A / D) is within 3, the molding material remaining in the gap between the lower edge 3a of the blade 3 and the bottom surface 4 is formed. Is small. Therefore, in the mixer of the present invention, the molding material does not adhere to the diffusion blade 2 when the thermosetting resin is produced.

In addition to the above effects, the mixer according to claim 2 of the present invention can lower the temperature of the blade 3 of the diffusion blade 2, so that the adhesive force of the molding material around the blade 3 is lowered. It is difficult for the molding material to adhere to the blade 3.

[Brief description of drawings]

FIG. 1 (a) is a partially cutaway front view of a mixer according to a first embodiment of the present invention, and FIG. 1 (b) shows a cross section of a blade of a diffusion blade and a side surface of a mixer main body. It is an explanatory view shown.

FIG. 2 is a partially cutaway plan view of the mixer according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a part of a diffusion blade of a mixer according to a second embodiment of the present invention.

FIG. 4 is an explanatory view showing a cross section of a conventional diffusion blade and a side surface of a mixer main body.

FIG. 5 is a partially cutaway front view of a conventional mixer.

[Explanation of symbols]

 1 Mixer main body 2 Diffusion blade 3 Blade 3a Lower edge 3b Upper edge 4 Bottom surface 5 Water channel 6 Rotating shaft 7 Chopper 8 Blade 9 Input port

Claims (2)

[Claims] 1. Vertical mixing comprising a mixing blade (2) for mixing powder or granules, mixing powder and liquid, and granulating, on the bottom surface (4) of the mixer body (1). Machine, the shape of the blade (3) having an angle in the rotation direction of the diffusion blade (2), and the shape of the cross section of the blade (3) is the thickness of the lower edge (3a) preceding in the traveling direction. A, bottom surface (4) of the mixer body (1)
A mixer having a ratio of A to D (A / D) of 3 or less, where D is a gap between the blade and the lower edge (3a) of the blade (3). 2. The mixer according to claim 1, wherein a water passage (5) for circulating cooling water is provided inside the blade (3).