FR2463232A1 - TOOLS FOR THE EXTRACTION OF ROCKS AND MINERALS - Google Patents

Abstract

TOOLS FOR THE EXTRACTION OF ROCKS OR MINERALS, IN PARTICULAR COAL, ORE OR SALTS, IN WHICH A WEAR RING 5 THE DIAMETER OF WHICH IS GREATER THAN THE LARGEST DIAMETER OF THE PERFORATION UNIT 1, IS PLACED BETWEEN THE LATTER'S SUPPORT SURFACE AND TOOL HOLDER 2.

Description

The present invention relates to a tool for the extraction of

rocks and minerals including

  coal, ores or salts and which is made up of

killed by a chisel-type perforating member, mounted to rotate in a support, and by a wear ring arranged between the perforating member and the support. Cutting tools of this type, including

  perforation, of the chisel type, turn of their own accord-

during their use so as to create a self-effect

sharpening.

  In tools known to date, the rotary perforating members are most often mounted directly in the support, which leads to significant wear of the support during operation as a result of the rotation of the perforating member. The replacement of the tool holder, connected by welding to a cylinder, is

  very expensive and requires periodic downtime

  of the machine. When welding work cannot be carried out at the workplace, for example, due to the danger of firedamp in mines, the entire cutting cylinder must be transported in a

repair workshop.

A tool, the support of which is fitted with an attached wear jacket made of hard material, has partially remedied these drawbacks. It has also been proposed to weld on surfaces exposed to

  wear, anti-wear alloys. These two types of tool-

  In fact, they have a high resistance to wear.

  but they have a cost price which is not related to the advantage obtained. In another known embodiment, the support comprises a socket

  mounted to turn and in which the perfo-

  ration can also turn. However, this mounting is only suitable for perforating members not exceeding

a certain diameter. For drilling machines required

  locating perforating members of a large diameter, it is not possible to use this arrangement because the support of the tool would become too bulky and the necessary intervals between the cutting lines could no longer be obtained. This embodiment

is, moreover, very expensive.

  The object of the present invention is therefore to create a tool for the extraction of rocks and minerals, the support of the perforating member of which has a

low wear while being of an acceptable cost price

table.

  These problems are solved in accordance with the invention.

tion by a tool which is characterized in that the diameter of the wear ring is greater than the diameter

the largest of the perforating organ. The price of re-

  comes from this tool is not higher than that -

  of known tools but the contact surface between

  the wear ring and the support of the perforating member

tion, is significantly larger which allows to reduce,

significantly, wear on the support. The utility

The use of a wear ring has the advantage that it is possible to mount a perforation member of low

diameter which, while being produced from a rough-

  also smaller, saves steel

  and reduce the machining time during manufacturing.

Another advantage of the tooling according to the invention is

  side in the fact that the greatest wear does not occur -

  more, as before, at the support but in the contact zone between the wear ring and the perforating member where the contact surface is substantially reduced. According to another characteristic of the invention, the wear ring is placed in a recess provided in the support where it simply rests on the support. It is thus possible to replace quickly and without problem

a worn ring.

Various other features of the invention -

  moreover emerge from the detailed description which

follows.

Embodiments of the object of the invention

tion are shown, by way of non-limiting examples

tifs, to the accompanying drawings.

  Fig. 1 is a side elevation of a perforating member of the chisel type.

  Fig. 2 shows, in longitudinal section, a pre-

first embodiment of the tool according to the

vention.

Fig. 3 is a longitudinal section of two

xth embodiment.

  The perforating member 1 shown in FIG. 1,

  has a collar 3 and an adjacent bearing surface 4.

  In fig. 2 the perforating member 1 of FIG. 1 is mounted in the support 2. A wear ring 5 of thickness b is placed between the collar 3 of the perforating member 1 and the support 2. The diameter d of the wear ring 5, resting simply on the support 2, and the diameter D of the collar 3 have a ratio of 5: 4. Therefore the support surface on the support 2 is

  significantly increased compared to that of the provisions

  known tif which allows to obtain a significant reduction

aunt at support 2 due to the surface of

  greater contact between the latter and the wear ring 5.

  In the embodiment, shown in FIG. 3, the wear ring 5, of thickness b, instead of simply resting on the support 2 as in the embodiment according to FIG. 2, is recessed

  in a corresponding recess 6 in the support 2.

Claims (3)

  1 - Tools for the extraction of rocks and minerals, in particular coal, ores or salts and which is constituted by a perforating member of the chisel type, mounted to rotate in a support, and by a wear ring arranged between the perforating member and the support, characterized in that the diameter of the wear ring (5) is greater than the most   large of the perforating member (1).   2 - Tool according to claim 1, charac- characterized in that the wear ring (5) simply rests on the tool holder (2).   3 - Tool according to claim 1, charac- in that the wear ring (5) is placed in a   recess (6) provided in the tool holder (2).