JP2018164865A - Dry classifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate replacement of a liner 20. SOLUTION: This is composed of vertical double cylindrical drums 1 and 2, and a fan blade 11 and a distributor 12 incorporated in a vertical shaft 9 on the central axis of the drum, and the lower part of the double cylindrical drum is conical 3 respectively. It is a dry classifier for sand making that is 4. Both cylindrical drums are composed of a grid-shaped bone frame 21, a side wall plate 22 provided on each grid-shaped portion A of the bone frame, and a liner 20 made of an abrasion-resistant material provided on the surface of the side wall plate 22. The side wall plate 22 can be opened to the outside by a hinge 23 provided on a part of the peripheral edge thereof, and can be moved to the outside from the grid-like portion A of the bone frame 21. When the liner 20 is replaced, the side wall plate 22 is rotated outward and opened by removing the mounting bolt (chain line state in the figure). In this state, the liner 20 is replaced. [Selection diagram] Fig. 1

Description

  The present invention relates to a dry classifier for sand making or the like that obtains crushed sand (sand making) by crushing and pulverizing raw stones.

Conventionally, river sand as aggregate for concrete structures has been craving, and various means have been proposed as means for obtaining crushed sand (sandmaking) by crushing and crushing rocks.
For example, the raw stone is primary (coarse) crushed with a jaw crusher or a gyratory crusher, then secondary (fine) crushed with a cone crusher, etc., and further pulverized with a pulverizer, and then processed with a vibrating sieve and a dry classifier. Thus, crushed sand (sandmaking) is obtained (see Patent Documents 1 and 2).

The dry classifier (air separator) is composed of a vertical double cylindrical drum and fan blades and distributors incorporated in the shaft on the center axis of the drum. The lower part of the double cylindrical drum has a conical shape. In some cases, the processed product (product) can be collected (see FIG. 1).
In this dry classifier, raw material (crushed stone) is supplied from the upper part of the drum, falls onto a rotating distributor, and is uniformly dispersed in the horizontal direction by centrifugal force. On the other hand, in the drum, a rotating fan blade forms an air flow that rises inside the inner cylinder and descends the outer cylinder, and coarse particles (sand) in the classified raw material fall down the inner cylinder. On the other hand, the fine powder component rises on the air flow, reaches the outer cylinder side, and falls inside.

  In this classifier, since the raw material such as the crushed stone is hard, the crushed stone collides with the inner surface of the drum and the wear is severe, and a liner made of a wear resistant material is stretched.

Japanese Patent Laid-Open No. 7-51591 JP 2007-70143 A

The liner is made of a wear-resistant material, but since it is heavily worn, it must be replaced for a certain period of time or if the wear becomes severe.
Conventionally, the liner has been changed by an operator between the inner and outer drums. This work is a work in a place without a scaffold, which is dangerous and has a bad working environment.

  This invention makes it a subject to make replacement | exchange of a liner easy under said actual condition.

In order to achieve the above object, the present invention is configured such that the drum portion side on which the liner is stretched can be directed outward.
In this way, the liner is opened toward the outside of the drum, so that the replacement becomes easy.

  A specific configuration of the present invention has a vertical double cylindrical drum and fan blades and a distributor incorporated in a saddle shaft on the central axis of the drum, and the lower portion of the double cylindrical drum has a conical shape. In the dry classifier, the two cylindrical drums are made of a lattice-shaped bone frame, a side wall plate provided on each lattice-shaped portion of the bone frame, and a liner made of a wear-resistant material provided on the surface of the side wall plate. The side wall plate can be configured to be movable outward from the lattice portion of the bone frame.

As the means for enabling the side wall plate to move outward from the lattice-like portion of the bone frame, an appropriate structure such as the side wall plate being removable via bolts to the bone frame is conceivable. It is possible to adopt a structure that can be turned outward by a hinge provided at a part of the periphery. In any case, the side wall plate is moved to the outside so that the liner is directed to the outside so that the replacement is easy.
The dry classifier having this configuration is most suitable for sand making used for classifying hard materials such as crushed stones as raw materials.

  Since the present invention is configured as described above and the liner can be exchanged outside the drum, the exchange operation is extremely smooth and simple. For this reason, the liner replacement work cost can be reduced and the working time can be shortened.

Schematic cut front view of one embodiment of a dry classifier according to the present invention Outline front view for explaining the operation of the same embodiment Partially omitted plan view for explaining the operation of the embodiment Main part enlarged cut front view for explaining the operation of the embodiment

1 to 4 show an embodiment of a sand classifying dry classifier according to the present invention. A sand classifying dry classifier according to this embodiment includes a cylindrical outer drum 1 with a lid, and an inner drum 1 having a lid. It has a coaxial inner drum 2 to form a double cylindrical drum.
The two drums 1 and 2 have a conical outer cone 3 or an inner cone 4 at the lower side, and discharge pipes 5 and 6 are provided below the cones 3 and 4, respectively.

  A shaft 9 that is rotated by a motor 7 via a speed reducer 8 is provided on the upper shaft center of the double cylindrical drums 1 and 2, and a fan blade 11 and a distributor 12 are provided on the shaft 9. . For this reason, when the raw material (crushed stone) a is introduced from the raw material supply pipe (supply port) 13 at the upper part of the outer drum 1, the raw material a falls on the rotating distributor 12, and is uniformly dispersed in the horizontal direction by centrifugal force. Is done.

On the other hand, the rotating fan blade 11 circulates and flows an air flow b that rises inside the inner drum 2 and descends outside, as indicated by a chain arrow.
For this reason, the coarse particles in the dispersed raw material a fall in the inner drum 2 and the inner cone 4 and are discharged from the discharge pipe 6 as crushed sand (sand making) a ′. On the other hand, the fine powder content of the raw material a rises on the circulating airflow b and falls into the outer drum 1 and the outer cone 3 (between the outer drum 1, the outer cone 3, the inner drum 2, and the inner cone 4). Then, it is discharged from the discharge pipe 5 as dust a ″.

  In addition, since the dry classifier for sand making according to this embodiment has a longer distance between the fan blade 11 and the distributor 12 (classification zone) than the conventional one, the classification efficiency is improved. Further, since the lower portion of the inner drum 2 is divergent, the distributor 12 prevents the coarse particles a ′ from hitting the lower slope of the inner drum 2 and jumping into the fine powder a ″.

When the raw material a is dispersed by the distributor 12, coarse particles and fine powder in the raw material a collide with or rub against the inner and outer surfaces of the inner drum 2, inner cone 4, outer drum 1, and outer cone 3.
Therefore, the inner and outer surfaces of the inner drum 2, the inner cone 4, the outer drum 1, and the outer cone 3 that are easily rubbed and worn are provided with wear-resistant materials such as high chromium cast iron (for example, the applicant's trade name: UCD (super resistance) A liner 20 comprising a wear cast composite material)) is provided.

  The attachment structure of the liner 21 is a feature of the present invention, and the part of the cylindrical drum (outer drum 1, outer cone 3, inner drum 2, inner cone 4) to which the liner 20 is attached is a lattice-like bone frame 21. And side wall plates 22 provided on each lattice-like portion A of the bone frame 21 and liners 20 stretched on the side wall plates 22. The cross-sectional shape of the liner 20 is arbitrary, such as a crescent-shaped piece that becomes thinner toward the end, an arc-shaped piece having the same thickness, or a rectangular piece.

The bone frame 21 has a lattice shape, but the lattice-shaped portion A is not necessarily a rectangular shape such as a rectangle or a trapezoid, but a shape that can open (turn) the side wall plate 22 outward, for example, a triangle. Etc. can also be employed (see FIG. 2). The side wall plate 22 is attached to the bone frame 21 with a hinge (hinge) 23 on one side thereof, and the other side portion is fixed to the bone frame 21 with a bolt or the like, thereby closing the lattice portion A.
A liner 20 is stretched over the entire inner surface of each side wall plate 22 by bolting or the like.
The side wall plate 22 that can be opened is in contact with the bone frame 21 through a packing so that air does not leak.

  Thus, since the side wall plate 22 is attached to the bone frame 21 via the hinge 23, the side wall plate 22 is rotated outward by removing the mounting bolt as shown in FIGS. (See the chain line state in FIG. 1). For this reason, when the liner 20 is worn and replaced, the liner 20 can be replaced from the outside of the drum by turning (opening) the side wall plate 22 (the liner 20) outward.

In this embodiment, the portion where the side wall plate 22 can be opened may be appropriately selected at a place where the replacement frequency (wear level) is high in actual operation, experiment, or the like. For example, the openable side wall plate 22 may be partially selected, and the liner 20 of the adjacent side strike plate 21 may be replaced through the opening of the open side wall plate 22.
Further, if each of the lattice portions A of the outer drum 1, the outer cone 3, the inner drum 2, and the inner cone 4 is manufactured with the same size and shape as possible, the side wall plate 22 and the liner 20 of the portions become common. , Production cost is reduced.

  The side wall plates 22 of the inner drum 2 and the inner cone 4 are not configured to be opened by the hinge 23, but are attached to the bone frame 21 only by fastening bolts so that the outer drum 1 and the outer cone 3 can be opened. The liner 20 can be replaced by removing the respective side wall plates 22 of the inner drum 2 and the inner cone 4 having the liner 20 to be replaced from the position where the side wall plate 22 is opened.

In the embodiment, the liner 20 is provided (attached) to the entire inner circumference of the outer drum 1, the entire upper inner circumference of the outer cone 3, the entire inner circumference of the inner drum 2, and the entire upper inner circumference of the inner cone 3. As for the attachment location, it is only necessary to appropriately select and attach the location where wear easily occurs. For example, the liner 20 can be provided at an appropriate location on the outer peripheral surface of the inner drum 2 or the outer peripheral surface of the inner cone 3. At that time, the lattice-shaped portion A provided with the liner 20 can be appropriately moved outward.
The embodiment is a dry classifier for sandmaking, but it goes without saying that the present invention can be applied to various dry classifiers that reduce wear on the drum side walls by a liner other than for sandmaking.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Outer drum 2 Inner drum 3 Outer cone 4 Inner cone 5, 6 Discharge pipe 7 Motor 8 Reduction gear 9 Shaft 11 Fan blade 12 Distributor 13 Raw material supply pipe (supply port)
20 Liner 21 Drum Bone 22 Side Wall Plate 23 Hinge
A Lattice part a (crushed stone)
a 'Sandmaking (Product)
a''dust
b Airflow

Claims (3)

A vertical double cylindrical drum (1, 2) and a fan blade (11) and a distributor (12) incorporated in a shaft (9) on the central axis of the drum, In the dry classifier where the lower part is conical (3, 4),
The cylindrical drums are arranged on the lattice-shaped bone frame (21), the side wall plate (22) provided in each lattice-shaped portion (A) of the bone frame (21), and the surface of the side wall plate (22) A dry type characterized in that the side wall plate (22) is movable outward from the lattice portion (A) of the bone frame (21). Classifier.   The said side wall board (22) can be rotated outside by the hinge (23) provided in the peripheral part, and can move outside from the lattice-like part (A) of the said bone frame (21). The dry classifier according to claim 1.   The dry classifier according to claim 1 or 2, which is used for sand making.

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