JPH078032Y2 - Screw blade of grinding and crushing equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a screw blade of a grinding and pulverizing apparatus for producing powder and granules.

[Conventional technology and its problems]

As shown in FIG. 14, this type of grinding and crushing device is provided with a vertical screw shaft 2 in a vertical processing cylinder 1 and filled with a crushing medium b such as a steel ball to rotate the screw shaft 2. In this state, the material to be processed a is put into the processing cylinder 1, and the material to be processed a is pulverized between them and with the grinding medium b to form fine production particles c, which then pass through the processing cylinder 1. The produced particles c are placed on a carrier fluid d such as air or water, and the produced particles c are led out of the processing cylinder 1. In the figure, the carrier fluid d is water.

The material to be treated a is usually charged from the upper part of the processing cylinder 1, but in the case of a slurry, it may be charged from the lower part of the processing cylinder 1 (see JP-A-1-317552). In addition, the carrier fluid d is supplied together with the object a to be processed, or separately, for example, by making the screw shaft 2 hollow, and is supplied from the lower part of the processing cylinder 1 via the shaft or another pipe (actually). Kaisho
63-118949).

As shown in FIG. 15, the conventional screw blade 3 of the screw shaft 2 in this grinding and crushing device welds a pre-curved curved plate 13a at the adjacent portion s, and at the same time, It is formed by welding to the material.

However, the curved surface processing of the curved plate 13a requires skill both cold and hot, and particularly when the screw blade 3 is large and thick, a high pressure press machine and a highly accurate mold are required. Therefore, the conventional screw blade 3 is very expensive.

Further, the screw blade 3 is provided with a liner to prevent the abrasion, but in this case, the lower surface of the liner needs to be along the upper surface of the blade 3. That is, the liner also needs to be a curved plate. For this reason, in the production of the liner, there are the same problems as in the case of the curved plate 13a, and since the liner is particularly hard, the problem becomes more serious. In addition, some liner materials, such as ceramics, are virtually impossible to bend in terms of technical difficulty, manufacturing cost, etc., so there is a limit to the choice of liner material. I was receiving it.

In view of the above points, the present invention aims to eliminate the curved surface processing.

[Means for Solving the Problems]

In order to solve the above problems, in this invention, in the screw blade of the above-mentioned grinding and crushing device, at the center of the ellipse, a through hole similar to the outer periphery thereof is formed, and the basic ellipse thereof is
A plurality of fan-shaped flat plates cut by an appropriate line extending from the through hole to the outer circumference are connected to the outer circumference of the screw shaft in the axial screw shape.

Further, in the one provided with a liner on the outer peripheral edge portion of the screw shaft in the axial direction of the screw shaft, the substrate is a plurality of flat plates, provided on the outer periphery of the screw shaft, the liner, At the center of the ellipse, a through hole similar to the outer periphery is formed, and the basic ellipse is a plurality of fan-shaped flat plates cut by an appropriate line extending from the through hole to the outer periphery, the screw along the upper plane of the substrate. It adopts the configuration that they are connected in a shape.

The above ellipse is used because the inclined plate having a circular axial plane shape has an elliptical plate shape, and may be a pseudo ellipse.

[Action]

The screw blade according to the present invention configured as described above,
The plane shape of the screw shaft in the axial direction is a circular shape or an approximate circular shape, and the outer peripheral locus of the blade has a step, but is a substantially smooth inclined line (see the embodiment). Therefore, even if the grinding action is performed as in the conventional case, the behaviors of the grinding medium, the object to be treated and the produced particles are not changed.

Example 1 As shown in FIG. 1, the screw blade 3 is a fan-shaped flat plate.
It consists of 3a and 3b. Based on the conventional screw blade 3, the flat plates 3a and 3b are
As shown in FIG. 4 and FIG. 4, ellipses p and q when the screw blade 3 is made flat are set, and at the center of the basic ellipses p and q, a through hole p ′ similar to the outer periphery thereof, q ′
And the ellipses p and q are taken as the shaded portion cut by a line extending from the through holes p ′ and q ′ to the outer periphery (FIGS. 5 and 6).

At this time, the basic ellipse p of the flat plate 3a has a shorter major axis than the basic ellipse q of the flat plate 3b. As a result, the flat plate described later
When the screw blades 3 are manufactured by connecting the 3a and 3b with different inclination angles, the axial planar shape of the screw blades 3 can be circular. Also, the fan-shaped angle α of the flat plates 3a, 3b,
β, that is, the cutting line is appropriately determined in consideration of the angle difference between the blade diameter of the screw blade 3, the average inclination angle of the screw blade determined by the blade pitch, and the attachment inclination angle of the flat plates 3a and 3b determined by the flat plate division number to the shaft member. You can select
The larger the number of divisions of the blade 3, the smaller the fan-shaped angles α and β of the flat plates 3a and 3b, and the smaller the angle difference of the mounting inclination angle to the shaft member, the closer to the shape of the conventional curved screw blade 3. Become.

The flat plates 3a, 3b thus created are welded in a spiral shape (screw shape) around the screw shaft 2 through a shaft member (not shown) as shown in FIG. And the flat plates 3a and 3b are connected by welding or the like. The plane shape of the screw blade 3 in the axial direction is circular as shown in FIG. 2, and the inclination angle thereof is as shown in FIG. 9 (in the figure, the embodiment is a solid line and the conventional example is a chain line). From this figure, it can be understood that the axial plane outer peripheral edge shape of the embodiment is circular as compared with the conventional example, and there is no great difference in the degree of inclination of the outer peripheral edge. Even in the actual machine, there was no big difference in the behavior of the crushed material, etc., and there was no big difference in the grinding rate.

As the shape of the flat plates 3a, 3b when the axial plane shape of the screw blade 3 may be an approximate circular shape, FIG.
Various types are conceivable such as those shown in (b), FIGS. 8 (a) and (b) (in FIG. 8 (b), the outer peripheral arc has a smaller curvature than that of an ellipse). In this case, the basic ellipses p and q are pseudo ellipses.

Further, as shown in FIG. 10, a flat plate in which a plurality of flat plates 3a and 3b are connected is bent r (not bent) at a desired place and at a desired angle, and the flat plate 3a, 3b is bent to a shaft of the screw shaft 2. If attached to a material, the flat plates 3a and 3b do not need to be welded to each other.

Example 2 In this example, the screw blade 3 is provided with a liner 4. In this case, since the liner 4 constitutes the outer peripheral edge, the flat plates 3a 'and 3b' which are the supporting members are formed in the same manner as the flat plates 3a and 3b, but it is necessary to make the outer peripheral edge a curved line. There is no.

On the other hand, since the liner 4 has a curved outer peripheral edge, the flat plates 4a and 4b are formed in the same manner as the flat plates 3a and 3b.
At this time, the basic ellipses p and q may be pseudo ellipses.

The flat plates 4a and 4b are attached to the flat plates 3a 'and 3b' by screws, welding or the like, as in the conventional case, as shown in FIGS. 11 to 13. Since the flat plate 3a ', 3b' is mounted on a flat surface, there is no problem even if the liner flat plates 4a, 4b are flat, that is, a liner made of a material such as ceramic that is hard to obtain a curved surface can be used. .

It should be noted that this invention may be applicable to various machines using screw blades.

[Effect of device]

Since the present invention is configured as described above and the screw blades are formed by combining the fan-shaped flat plates, the manufacturability is remarkably improved and the cost can be reduced.

In addition, the liner is also attached to a flat surface, which improves workability and eases restrictions on the liner material.

[Brief description of drawings]

1 and 11 are perspective views of the essential parts of each embodiment of the screw blades of the grinding and pulverizing apparatus according to the present invention, and FIGS. 2 and 13 are schematic plan views of FIGS. 1 and 11. 3 to 8 and
FIG. 10 is a manufacturing explanatory view of a screw blade, FIG. 9 is a comparative view of the inclination of the screw blade, FIG. 12 is a sectional view of a main part of FIG.
FIG. 14 is a schematic sectional view of a grinding and crushing device, and FIG. 15 is a partial perspective view of a conventional example. 1 ... Processing cylinder, 2 ... Screw shaft, 3 ... Screw blade, 3a, 3a ', 3b, 3b' ... Flat plate, 4 ... Liner,
4a, 4b …… Liner flat plate.

Claims (3)

[Scope of utility model registration request] 1. A screw blade of the screw shaft of a grinding and pulverizing apparatus, wherein a vertical screw shaft is provided in a vertical processing cylinder, and a grinding medium and an object to be treated are filled with the screw blade of the screw shaft. A similar through hole is formed, and its basic ellipse is a plurality of fan-shaped flat plates that are cut by an appropriate line extending from the through hole to the outer circumference, and are connected to the screw shaft outer circumference in the axial screw shape. A blade of a grinding and crushing device. 2. A screw blade of the screw shaft of a grinding and pulverizing apparatus, wherein a vertical screw shaft is provided in a vertical processing cylinder, and a grinding medium and an object to be treated are filled, and the screw blade is in the axial direction of the screw shaft. A liner is provided on the outer peripheral edge of the substrate, wherein the substrate is a plurality of flat plates provided on the outer periphery of the screw shaft, and the liner is similar to the outer periphery at the center of the ellipse. A plurality of fan-shaped flat plates formed by forming a through hole and cutting the basic ellipse with an appropriate line extending from the through hole to the outer periphery are connected in the screw shape along the upper plane of the substrate. Screw blade of the grinding and crushing device. 3. The screw blade of the grinding and pulverizing apparatus according to claim 1, wherein the basic ellipse forming the outer edge of the flat plate is a pseudo ellipse.