JPS5930462B2 - Ball mill end liner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an end liner that lines the partition wall of a ball mill.

The end liner lined on the partition wall of a ball mill is
Since the service life is 1/2 to 1/3 that of a shell liner that is lined on the inner circumferential surface of the cylinder, various attempts have been made to extend the service life without reducing the crushing efficiency or grinding effect. It's here.

For example, the idea of Utility Model Publication No. 45-22479 is to dig a large number of grooves with a U-shaped cross section diagonally in the longitudinal axis direction of the liner base in a diagonal or curved shape, or in an S-shape. death,
Steel balls are inserted into these grooves to improve grinding efficiency.
Since the grooves dug in this way are arranged without regard to the flow dynamics of the steel balls in the ball mill, the steel balls that are directly bitten by the grooves on the surface of the liner-base of the end liner. Since the flow dynamics inside the ball mill are disturbed, the grinding effect is large, but the relative friction with the steel balls is also large, and the wear on the liner base surface of the end liner is correspondingly large. On the other hand, if the steel balls are arranged in an interlocking manner on the surface of the liner base in accordance with the flow curve of the flow dynamics, the relative friction between the surface of the liner base and the steel balls will be reduced, and the wear of the surface of the liner base will also be reduced. Naturally it will decrease. Therefore, the present invention has developed grooves with a U-shaped cross section arranged in a predetermined phase on the surface of the liner base along the average flow curve of the flow dynamics during scraping of steel balls in a ball mill, and At the same time as making the ball easier to bite, the steel ball is sandwiched between the protrusions formed by the steel ball caught in the grooves to suppress floating flow of the steel ball on the liner base surface as much as possible. This is designed to reduce the relative friction between the end liner and the steel ball, thereby extending the service life of the end liner. That is, the flow dynamics of steel balls in a ball mill consists of three layers a, b, and c, as shown in Figure 3, and they are successively scraped up to the upper layer to perform the abrasive action, but the surface of the end liner Grooves with a U-shaped cross section are dug and arranged in a predetermined phase in a curved shape that approximates this flow curve, and lateral pressure is applied between each phase of the protrusions made of protrusions of steel balls bitten by the grooves. By competing with each other to pinch the received steel balls, the relative friction between the steel balls and the liner surface is suppressed.

Hereinafter, the structure of the present invention will be explained based on examples.
FIG. 1 shows a partially cutaway front view of the arrangement of the end liner 1 of the present invention, and the grooves 2 having a U-shaped cross section are determined as follows.

In other words, a straight line 4 descending at an angle of Q (approximately 65 degrees) with respect to the rotation direction of the arrow with respect to one normal line 3 equally divided from the center of the mill, and the next normal line 3' in the rotation direction of the arrow. Intersection 5
seek. Next, a straight line 4 having an angle Q with the normal line 3' is drawn through the intersection point to find the intersection point 5 with the next normal line. Connect each intersection point 5 found in this way with a smooth curve,
The flow curve 6 is changed in the radial direction from the outer periphery toward the inner periphery by forming a groove 2 having a U-shaped cross section with a predetermined width and depth around this curve in the shape of a spiral curve 7 that approximates the flow curve 6. They are excavated near the curved point 8 and arranged in a predetermined equally divided phase. In this embodiment, since there is a cross-shaped connection part 9 in the circumferential direction and the radial direction, since this connection part 9 is the weakest part, the center of one point of the groove 2 is placed at the center of this connection part 9, and a predetermined curve is formed. 7, trenches were dug. With the above structure, the steel balls that are scraped up by the lifter of the shell liner and in contact with the surface of the end liner due to the rotation of the ball mill are moved into the grooves 2 mainly by the lateral pressure from the steel balls in the ball mill and the ore. The steel balls are wedged in the steel balls, and are then sandwiched in a competitive manner between the protrusions made of the steel balls, which are then wedged into the end liner surface. These steel balls prevent wear on the surface of the end liner and extend the service life of the end liner while increasing the milling efficiency without reducing the amount of floating through these embedded steel balls. There are characteristics that can be used.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of the end liner arrangement of the present invention, Fig. 2 is a sectional view taken along the line A-N in Fig. 1, and Fig. 3 is a partially cutaway front view of the arrangement of the end liner of the present invention. −
It is a flow dynamics diagram of Lumil steel balls.

Claims (1)

[Claims] 1. Grooves with a U-shaped cross section are arranged on the surface of the end liner lined with the partition wall of the ball mill in a curved line that follows the flow curve of the flow dynamics during scraping up the steel balls in the ball mill. An end liner characterized by further inserting steel balls between the steel balls that are inserted into the grooves during raking.