JPS60114357A - Liner for mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liner attached to the body of a ball mill, tube mill, etc.

Conventionally, as shown in FIG. 1, this type of liner has been provided with a convex lifter part 12 on the inner surface of a liner 11 that is divided into many pieces and is attached to a body 10 so as to cross the rotational direction of the mill. things are known. This is designed to raise the balls high by the lid part 12 to improve the grinding efficiency of the mill, but inside the mill, the balls move, slide, and fall in various directions, and the balls move on the surface of the liner 11. Colliding with the protruding lifter part 12,
Since the lifter part 12 wears out earlier than other parts, there is a drawback that the ball scraping efficiency decreases, and as a result, the grinding efficiency of the mill decreases. Also, the balls used in mills generally have a diameter of 2.
The part between the lifter part 12 of the liner 11 that crushes the material to be crushed between this ball and the ball is a substantially flat curved surface with a radius of curvature that is 20 times or more the diameter of the ball. As a result, the ball surface with a small radius of curvature and the liner surface with a large radius of curvature face each other, and the effective surface area between the ball and the liner that contributes to the pulverization of the material to be crushed is extremely small, resulting in poor pulverization efficiency. there were.

This invention eliminates the drawbacks of the conventional ones as described above, and reduces the chance that the balls come into direct contact with the liner during operation of the mill, thereby suppressing wear on the liner and reducing the amount of space between the balls and the liner. It is an object of the present invention to provide a liner that can improve the pulverization efficiency by increasing the effective area contributing to pulverization.

In order to achieve the above-mentioned objects, the present invention provides a number of parallel grooves on the inner surface of the liner along the direction of rotation of the mill, and a groove approximately equal to or less than the radius of the largest ball at the bottom of the groove. A number of four spherical parts having a radius of curvature somewhat larger than that of the mill are formed at intervals, and the depth of each recess becomes gradually shallower in the direction opposite to the direction of rotation of the mill. It is something to do.

An embodiment of the present invention shown in the drawings will be described below.

As shown in Figures 2 to 6, l is a liner divided into many parts, and grooves 2 are provided on the inner surface of the liner along the direction of rotation of the mill (indicated by arrows in Figure 5). There is. One groove 2 may be provided for each divided liner 1, or a plurality of grooves may be provided as shown in the figure. In any case, when a number of divided liners 1 are attached to the body of the mill, a large number of grooves become parallel. You can set it like this. The distance W between adjacent grooves 2 is about 1.0 to 1.5 times the radius of the largest ball.

A number of spherical recesses 3 are provided at intervals in the bottom of the groove 2, and the radius of curvature of the recesses 3 is approximately equal to or somewhat larger than the radius of the largest ball (preferably (approximately 1.0 to 1.2 times the radius). As a result, protrusions 4 are formed between the four parts 3, and the depth of each recess 3 becomes gradually shallower in the direction opposite to the rotational direction of the mill. 5 is a bolt hole for attaching the liner.

Next, the action of the liner as described above will be explained.

Before that, let me explain the behavior of the ball inside the mill.
As shown in Fig. 7, among the balls that are stirred up during the rotation of the mill, those with a large diameter fall near the end of the ball group as shown by symbol A, and roll and collect as the mill rotates. Tend.

Therefore, according to the liner 1 as described above, the balls fall onto the pile balls in the direction of the arrow as shown in FIG. As in the past, pulverization is carried out by the load, the weight of the accumulated balls, or the transfer of the balls, but due to the above-mentioned tendency of the balls to fall and transfer, the large-diameter balls L
The ball L easily fits into the groove 2, and at this time, the ball L crushes the material to be crushed between it and the groove wall, and especially in the recess 3, since the radius of the ball L and the radius of curvature of the recess 3 are almost equal, the ball L The effective surface area that contributes to pulverization increases, and pulverization is performed efficiently. Then, other balls are deposited on the large diameter ball L, and the ball L once fitted into the groove 2 as described above.
is maintained in that state until it reaches its rising limit, so the state in which the object to be crushed is interposed between the ball L and the liner L is maintained, and there is little chance that the ball L will come into direct contact with the liner 1. Wear of the liner 1 is suppressed. Furthermore, when a large 5-diameter ball L is fitted into the groove 2, the falling balls collide with the fitted ball L and accumulate, and there is little chance of the falling balls colliding with the surface of the liner 10 between the grooves 2. Wear is suppressed. Grinding is performed in this way, and the balls L fitted into the grooves 2 as described above rise as the mill rotates, but at this time, the protrusions 4 between the recesses 3 act as ball lifting parts to achieve the desired scraping. act.

In addition, the thickness of 2 ina 1 of the above shape is the same as that of the conventional lychee (
When used in a mill with the same diameter, the lifter part that is convex from the liner surface is eliminated and the concave part 3 is provided, which increases the effective internal volume of the mill and reduces the amount of balls charged and It is possible to measure the increase in the amount of material charged or the distance the ball falls.

It goes without saying that various design changes can be made, such as making the angle of the gentle rear slope of the recess 3 or the rear thickness in the direction of rotation of the liner larger than the front thickness, and creating a stepped cross section with the liner attached.

This invention provides grooves along the rotational direction of the mill on the inner surface of the liner, and forms recesses at the bottom of each groove with a radius of curvature approximately equal to that of the largest ball. Since the depth gradually becomes shallower in the direction opposite to the rotation direction of the mill, there are fewer opportunities for direct contact between the balls and the liner, and wear on the liner is suppressed as much as possible. Therefore, the wear of the ball's raking part is reduced, so there is less reduction in the ball's raking height, and the initial grinding efficiency can be maintained for a long time.
The life of the liner itself is extended and the replacement cycle can be maintained for a long time. Furthermore, since the surface area of the balls is effectively used for pulverization, there are various effects such as improved pulverization processing capacity.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional example, Fig. 2 is a perspective view showing an embodiment of the liner of the present invention, Fig. 3 is a plan view of the same as above, and Fig. 4 is a line - IV in Fig. 2. FIG. 5 is a cross-sectional view taken along line v--■ in FIG. 2, FIG. 6 is a cross-sectional view taken along line vi--vi in FIG. This figure is a schematic view showing the behavior of the balls during rotation of the mill, and FIG. 8 is a drawing similar to FIG. 4 showing the state of accumulation of balls on the liner. 1...Liner 2...Groove 3...Concavity 4...Protrusion L...Large diameter ball rain 5 flashes 9 6.Amendment details Procedural amendment ■, Indication of incident 1982 Patent Application No. 223977 2, Relationship with the Title of Invention Case Patent applicant: 1-12-19 Kitahorie, Nishi-ku, Osaka, Osaka Prefecture Kurimoto Iron Works Co., Ltd. Representative: Riki Igarashi 4; Agent: 5; Subject of amendment ( 1) "From doing" on page 7, line 7 of the specification is amended to "from doing, accompanying the operation of the mill." (2) In the 8th line of the same page, "the decline is small" is corrected to "the degree of decline is small." Above 2-

Claims (1)

[Claims] 1. On the inner surface of the liner of a ball mill, tube mill, etc., a large number of grooves are provided in parallel along the rotational direction of the mill, and at the bottom of each groove there is a radius that is approximately equal to or somewhat larger than the radius of the largest ball. A large number of spherical recesses with a radius of curvature of