JPS583651A - Roll - 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 roll that can be applied to various mill rolls for crushing coal, ore, cement raw material (limestone), and the like.

The structure of a conventional roll is shown in FIGS. 1, 2, and 3. First of all, the roll shown in Fig. 1 is a so-called truncated cone-shaped integrated roll (<&), and the entire integrated roll (a) including the roll sliding part (1) that requires wear resistance is hardened. It is made of highly wear-resistant material. This integrated roll (a) is manufactured by a centrifugal casting method or the like. As the wear-resistant material (1), for example, nihard cast iron with the composition shown in Table 1, high chromium cast iron, etc. are used.Roll (b) shown in Figure 2 is a so-called double centrifugal It is a casting roll or an inner layer front filling roll. Double centrifugal casting rolls or inner layer front filling rolls (
b) The central cavity (3) is assembled by grinding a shaft (not shown) into the cavity (3).The outer layer (da) of the roll (b) in Figure 1 must have wear resistance. It is a highly hard and wear-resistant material, and materials such as hardened cast iron and high chromium cast iron are generally used.
The inner layer (j) is made of ordinary cast iron or cast carbon steel, which has low hardness and excellent machinability.

Figure 3 shows an overlay roll (Q), with an inner layer (5) made of a material with low hardness and excellent machinability, such as charcoal-steel cast steel or ordinary cast iron, and an outer layer with wear resistance. The overlay material (6) is made by welding and overlaying a material with excellent properties, for example, the chemical composition of which is shown in Table 2.

Now, the roll (a) shown in Figures 1, 2 and 3
(b) (0) is used to crush coal, ore, etc. between the bull ring (7), which has excellent wear resistance, as shown in Figure DA. ) (Q)
As the operating time of
~ The position corresponding to IOH is the most worn part (9).

Here, the wear status of the same roll is shown separately #! rv
It is l. The depth of this maximum wear part (9) is
When it becomes about 0■, the grinding ability of the mill decreases and the target grinding amount cannot be obtained. In addition, the particle size of crushed coal, etc. is 1. Problems such as roughness than the target may occur. Therefore, before reaching this point, those worn rolls (a), (b), and (o) are usually replaced with new, unworn rolls.◎ As mentioned above, the entire length of the roll sliding part (1) is The rolls (a), (b), and (c) manufactured using wear materials have a large diameter end (f) as shown in Fig. D or JWJ.
) is hardly worn, and the maximum wear part (?) is located at a position corresponding to the large diameter end (f) of the roll, and wear mainly occurs at the small diameter end (L side) of the roll.

When the depth of the maximum wear part (9) reaches approximately 3~3°■, the large diameter end (r) of the roll remains unworn, and the roll (,) (b) (0) and Bullring (
? ) cannot be adjusted. Therefore, the target grinding capacity (capacity and particle size) of the mill etc. cannot be obtained, and at this point the worn rolls (a) (b) (0) are discarded.
% It was necessary to replace the roll with a new one.@The present invention was proposed to eliminate the above-mentioned drawbacks of the conventional roll. It is an object of the present invention to provide a roll that can be used for a long time by making it possible to adjust the distance between the roll and the bull ring.In other words, the present invention provides a roll that can be used for a long time without being worn out in the conventional roll. The end of the crushing surface of the roll body is made of a soft material that is less hard than the other sliding parts, so that the sliding part of the roll wears linearly over almost the entire length. We aim to provide a new role.

Embodiments of the present invention will be described below with reference to the drawings.
! ! Figures 7 and 1 show the third embodiment of the present invention. First, Figure 6 shows an improved version of the conventional integrated roll (&) shown in Figure 1. This is body type roll (4). The difference between this example and the conventional example is that the wear-resistant material (//)
Roll large diameter 1 of integrated roll (4) integrally constructed with
11S (/) in the direction of the four-wheel small diameter, lowering the roll height.
4 o ~ '40 - The above roll (4) corresponds to the height of the roll.
Soft material (13
).

Next, the rolls (B) and (C) shown in Figures 7 and 7 are the double centrifugal casting rolls (11) shown in Figure 2, respectively.
and a roll showing an embodiment of the present invention which is an improved overlay roll (Q) shown in FIG. empty space (l
The structure and materials of the rolls are the same as those shown in FIGS. 2 and 3, so detailed explanations are omitted. Also, the reference numeral (13) in FIGS. The outer layer (/4') of a wear-resistant material attached to promote wear of the large diameter end (lλ) shows a ring made of a soft material whose hardness is softer than that of (/!>).

In addition, the soft materials (1
The ring in 3) may be made of any soft material (13) whose hardness is softer than that of the wear-resistant material (//) and the outer layer (21). Wear-resistant material (ll) and outer layer (lsu (/!r) or inner layer (1
6) The bonding with the wear-resistant material (ll) and the outer layer (l
This is done by the casting method that connects S) when casting, or the welding overlay method.Next, to explain the function and effect, Fig. The outer shape of the body roll (4) is shown by a solid line in the figure, and the outer shape of the roll (4) in a state where the roll is worn out after being operated for a certain period of time is shown by a dotted line.

A seventh embodiment of the present invention is shown in FIG.
) uses a soft material (/J) that easily wears out on the large diameter end (l) of the roll, which remained without wear in conventional rolls (a), (b), and (e). As shown in Figure 2, the sliding part of the roll (4)
It wears out in a straight line from the end of the roll to the small diameter end (/1). Therefore, when the distance between the roll (A) ω) (c9 and the bull ring (7) becomes approximately koS latitude, and the crushing capacity of the mill decreases, the roll (A) (B) (C) If the slope of is made 11 knots and the distance between the same rolls (A) (B) (C) and the bull ring (ri) is made smaller, that roll CA)
CB) (c) can be reused.In this way, the roll (4) (B) (C) of the present invention has a usable time that is longer than that of the conventional roll (&) (1)) (C). Since it can be extended to about double the length, it is possible to save the number of guests who have to exchange these rolls (A)ω)(0).

Finally, the reason why the range of use of the soft material was limited to a position equivalent to the height of the roll from the large-diameter end of the roll near the maximum wear part of the roll sliding part to the roll's height in the direction of the roll's small diameter: This will be explained below.

The maximum wear area of the roll depends on the size of the roll and the properties of the raw material to be crushed, but as mentioned above, the area of maximum wear on the roll is approximately 40 degrees from the large diameter end of the roll in the direction of the small diameter of the roll.
-'to position 0 Therefore, in order to make the wear of the roll sliding surface almost linear, the range of use of soft material is from the position of maximum wear to the height of the roll. I judged that it was appropriate to move the position closer to the edge and the edge.
As mentioned above, the position is defined as a position corresponding to the roll height F4'15o to '4.

Margin below Chapter - Table

[Brief explanation of the drawing]

Figures 1, 3 and 3 show conventional p-types for various types of mills, respectively.
Cross section li of the roll that can be applied to rolls, etc. ! IS No. 91! U
and Fig. S are explanatory diagrams showing the state of wear of the roll shown in Fig. 1, Figs. It is an explanatory view showing the state of wear of the roll of the figure. Explanation of the main parts of the diagram //... Wear-resistant material lλ... P-L large diameter end l
3... Soft material 17... Inner cavity tg...
Roll small diameter end patent applicant Mitsubishi Heavy Industries, Ltd. White

Claims (1)

[Claims] In a roll knee for crushing coal, etc., a roll is characterized in that the crushing surface end of the roll body is formed of a soft material.