JPH11128758A - Impact type crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impact type crusher controlling the generation of fine powder, and suitable for manufacturing a phenol resin molding material and the like. SOLUTION: In the constitution of this crusher, matter to be crushed is crushed by intermeshing a plurality of projected square pillarlike protrusions 4 formed on a rotating table 5 in a crushing chamber 2 with a plurality of pillarlike protrusions 6 formed on a fixed table 7 of an opening and closing door. In this case, a plurality of projected square pillarlike protrusion 4 are disposed on a plurality of lines in the concentric circle radial shape on the rotating table 5, and the height of protrusions 44 disposed on the outermost peripheral line is set to be 1/2-2/3 of the height of the square pillar-shaped protrusions 4 disposed on other peripheral lines. Also the number of the square pillarlike protrusions 44 on the outermost peripheral line is set to be half or less of the number of protrusions on the peripheral line which is on the line inner side of the outermost line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating disk which is rotated in such a manner that a plurality of protruding prism-like projections provided on a rotating disk and a plurality of prism-like projections provided on a fixed disk inside a door are engaged. The present invention relates to an improvement of an impact-type pulverizer in which an object to be pulverized is pulverized by an impact and a shearing action between the projection and the object to be pulverized. More specifically, according to the present invention, among a plurality of protruding prism-shaped protrusions installed on the turntable, the height of the protrusion arranged in the outermost row is ２〜 to ／ of the height of the protrusions in the other circumferential rows. Further, the present invention relates to an impact-type pulverizer having a structure in which the number of prismatic projections in the outermost peripheral row is less than half the number of projections in the inner peripheral row of the outermost peripheral row.

[0002] The impact-type pulverizer according to the present invention (hereinafter sometimes simply referred to as pulverizer) can sufficiently suppress the generation of fine powder due to pulverization, improve the product yield, and improve the phenol resin,
It is suitable as a pulverizer used in the production of thermosetting resin molding materials such as unsaturated polyester resins and melamine resins.

[0003]

2. Description of the Related Art Conventionally, a thermosetting resin molding material such as a phenol resin is generally prepared by mixing a resin component and a compound such as a reinforcing material, a filler and other various additives with a mixer such as a kneader. It is obtained by kneading with a kneading machine or the like and then pulverizing with a crushing machine into a sheet form, or extruding a mixture of a resin component, a reinforcing material, a filler and various additives with a kneading extruder into pellets.

[0004] The above-mentioned resin component and a compound such as a reinforcing material, a filler and other various additives are mixed by a mixer such as a kneader, kneaded by a heating roll, a kneader or the like, then formed into a sheet and pulverized by a pulverizer. In this case, the impact-type pulverizer has been used widely since it is simple. Generally, an impact-type pulverizer is sized by a screen provided in a pulverizing chamber, and a desired particle size can be obtained depending on the size of the mesh (pore diameter) of the screen. In the pulverization by the impact-type pulverizer, the projections provided on the rotating disk rotate so as to mesh with the projections attached to the fixed disk, and are pulverized by an impact or shearing action. In such a case, particularly in the case of a high-strength molding material such as a glass fiber-reinforced molding material, there are problems that fine powder is likely to be generated and the yield is deteriorated.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an impact-type pulverizer for producing a thermosetting resin molding material such as a phenolic resin molding material, particularly a high-strength molding material containing glass fiber as a reinforcing material. In view of the problems such as the generation of a large amount of fine powder and the yield that are observed when pulverization is performed, an improved impact type for suppressing the generation of fine powder and obtaining a thermosetting resin molding material such as a phenol resin with a good yield. A crusher is provided.

[0006]

Means for Solving the Problems The present inventors have repeatedly studied the above-mentioned problems from various viewpoints, and focused on the structure of an impact-type pulverizer, particularly on the protruding prismatic projections provided on a turntable. As a result of the study, the height of the projections arranged in the outermost row among the plurality of protruding prismatic projections arranged on the turntable is set to 1 / th of the height of the projections arranged in the other circumference rows. The present inventors have found that by setting the ratio to 2/3, the generation of fine powder is remarkably suppressed.

That is, the present invention comprises an opening / closing door and a crushing chamber, and has a raw material inlet in the center of the opening / closing door, and a plurality of prismatic projections are provided in a concentric plurality of rows on a fixed plate inside the door. The crushing chamber is provided with a rotating plate having a plurality of protruding prismatic projections, an impact-type crusher in which a screen is disposed on the outer periphery of the rotating plate in the crushing chamber, the rotating plate has a plurality of. A plurality of protruding prismatic projections are radially arranged concentrically, and the projections arranged in the outermost row are 1/2 to 2/3 of the height of the prismatic projections arranged in the other peripheral rows. And a shock type crusher characterized by the following.

[0008] Further, the opening / closing door and the pulverizing chamber are provided, and a material input port is provided at a central portion of the opening / closing door, and a plurality of prismatic projections are provided concentrically in a plurality of rows on a fixed plate inside the door. The grinding chamber is provided with a rotating disk having a plurality of protruding prismatic projections, and an impact-type pulverizer in which a screen is disposed on an outer periphery of the rotating disk in the grinding chamber. The columnar projections are arranged in a plurality of rows concentrically and radially, and the projections arranged in the outermost row are 1/2 to 2/3 of the height of the prismatic projections arranged in the other outer rows. The present invention relates to an impact-type pulverizer characterized in that the number of arranged prismatic projections is not more than half of the number of projections in the innermost row of the outermost row.

In a commercially available impact-type pulverizer which is generally used, a plurality of prismatic projections provided concentrically on a turntable usually have two to three rows depending on the size of the pulverizer. The number of projections arranged in the outermost row in the peripheral row is generally 8 to 10 and the height is also the same.

[0010] In a pulverizer according to the present invention, in the impact type pulverizer, a plurality of protruding prism-shaped projections provided on the rotating disk are arranged concentrically and radially, and the projections arranged in the outermost row are other projections. It is characterized in that the height is set to 1/2 to 2/3 of the height of the peripheral columnar projections.

Further, in the present invention, the height of the projections arranged in the outermost row is 1/2 to 2/3 of the height of the prismatic projections arranged in the other outer row, and the height of the projections arranged in the outermost row is increased. The number of the prismatic projections is less than half of the number of projections in the inner row of the outermost row (n-1 rows where n is the number of concentrically arranged rows). Is also one of the features.

In the pulverizer according to the present invention, the height of the prismatic projections provided in the outermost row of the rotating disk is ２〜 to の of the height of the projections in the other peripheral rows. Since the number of prismatic projections arranged in the outer circumferential row is less than half of the number of protrusions in the inner circumferential row of the outermost circumferential row, substantial pulverization in the grinding chamber is performed in a portion other than the outermost circumferential row. Pulverization by prismatic projections in the outermost row is performed only to the extent that some of the pulverization was insufficient, and the amount of fine powder generated during the pulverization was suppressed. Is reduced to less than half of the generation amount when using, and the product yield is improved.

Here, with reference to the drawings, a case where a phenol resin molding material is prepared by an impact-type pulverizer will be described as an example.

A mixture of a phenolic resin and a desired additive such as a reinforcing material (glass fiber), a filler, a curing agent, a curing aid, and a release agent is mixed by a mixer such as a kneader, and heated by a heating roll. The kneaded material A obtained by kneading with a kneader or the like and then drying and crushing is shown in FIG.
Through a hopper 9 of a pulverizer and a passage 10, the raw material is charged into a pulverizing chamber 2 from a raw material charging port 1 provided in an opening / closing door 11. The crushed material to be crushed is placed in the crushing chamber 2 by the opening and closing door 11.
A plurality of projections 6 attached to a fixed platen 7 provided in
By the prismatic projections 4 provided on the rotating disk 5 which rotates at a high speed so as to mesh with the crushed particles, the particles are crushed by impact and shearing action.
The pulverized material is stored in the product storage unit 8 as the product B through the screen 3 having a predetermined mesh size. On the other hand, the fine powder generated by the pulverization is discharged from the discharge port to the outside by the wind force and centrifugal force generated by the high-speed rotation of the turntable and collected.

More specifically, an example in which the pulverization is performed by using the pulverizer according to the present invention will be described in detail. As a result of pulverizing about 750 kg of a coarsely crushed glass fiber reinforced phenolic resin molding material, about 660 kg of a desired product is obtained. Was obtained, and the generation of fine powder was about 80 kg.

On the other hand, when about 750 kg of the crushed material is crushed under the same conditions using a commercially available conventional type impact crusher, about 550 kg of the desired product is obtained and about 1 kg of the fine powder is obtained.
It was 50 kg or more.

[0017]

As described above, when the pulverizer according to the present invention is used, the amount of generated fine powder is remarkably reduced to less than half as compared with a conventional impact type pulverizer commercially available, and the product yield is reduced. Was significantly improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a pulverizer provided with a rotating disk according to the present invention. 2 shows a front view of a turntable having prismatic projections, and FIG. 3 shows a side view of FIG. FIG. 4 shows a perspective view of FIG. In the figure, 1 is a raw material inlet, 2 is a crushing chamber, 3
Is a screen, 4 is a prismatic projection arranged on a turntable, 4
4 is a prismatic projection provided in the outermost row of the rotating disk, 5 is a rotating disk, 6 is a projection provided on the fixed disk, 7 is a fixed disk, 8 is a product storage section, 9 is a hopper, 10 is a passage, 11 Is the opening and closing door,
Respectively.

[Drawing]

Claims (4)

[Claims] 1. A crushing chamber comprising a door and a crushing chamber, a raw material inlet in the center of the opening and closing door, and a plurality of prismatic projections provided concentrically in a plurality of rows on a fixed plate inside the door. An impact-type pulverizer having a rotating disk having a plurality of protruding prismatic projections, and a screen disposed on an outer periphery of the rotating disk in the grinding chamber, wherein the rotating disk has a plurality of protruding prismatic shapes. The plurality of projections are radially arranged concentrically, and the height of the projections arranged in the outermost row is ２〜 to ／ of the height of the prismatic projections arranged in the other circumferences. Impact crusher. 2. A plurality of prismatic projections provided on a rotating disk are arranged so as to mesh with a plurality of prismatic projections provided concentrically on a fixed disk inside an opening / closing door.
The impact-type pulverizer described. 3. The impact-type pulverizing device according to claim 1, wherein the number of prismatic projections in the outermost row arranged concentrically on the rotating disk is less than half the number of projections in the inner row of the innermost row. Machine. 4. A method for producing a phenolic resin molding material using the impact-type pulverizer according to claim 1.