US3467439A - Working member of rotary type in a mechanized drifting shield - Google Patents

Description

Sept. 16, 1969 E. M. BOLOTIN ET AL 3,467,439

WORKING MEMBER OF ROTARY TYPE IN A MECHANIZED DRIFTING SHIELD Filed Feb. 28, 1967 2 Sheets-Sheet 1 Sept. 16, 1969 E. M. BOLOTIN ET'AT. 3,467,439

WORKING MEMBER OF ROTARY TYPE IN A MECHANIZED DRIFTING SHIELD 2 Sheets-Sheet 2 Filed Feb. 28, 1967 3 My" Z- x if m 5 United States Patent 3,467,439 e WORKING MEMBER OF ROTARY TYPE IN A MECHANIZED DRIFTING SHIELD Evgeny Moiseevich Bolotin, Otkrytoe shosse 24, korp. 25, kv. 12; Lev Abramovich Blyakher, Posledny per. 1/ 22, kv. 6; Boris Nikolaevich Ierusalimsky, Otkrytoe shosse 24, korp. -a, kv. 45; Leonid Ivanovich Saveliev, Otkrytoe shosse 29, korp. 11, kv. 58; Vladimir Ivanovich Razmerov, Leningradsky prospekt 62, kv. 90, and Leonid Konstantiuovich Khaidurov, Otkrytoe shosse 24, korp. S-g, kv. 31, all of Moscow, U.S.S.R.

Filed Feb. 28, 1967, Ser. No. 619,329 Int. Cl. E21c 13/02, 1/14 U.S. Cl. 299-90 4 Claims ABSTRACT OF THE DISCLOSURE A working member of rotary type in a mechanized drifting shield for underground mining provided with at least two curvilinear blades defining the front end part of the working member and having a kerf-bar tool. The blades are inclined from the center of the working member end part towards the side opposite to the working travel of the shield.

The present invention relates to mechanized shields for use in underground mining and more particularly to mechanized drifting shields provided with a working member of rotary type.

Known in the art are mechanized drifting shields which have a working member of the rotary type whose front end part comprises at least two curvilinear blades, each having a cutter at the front radial edge as viewed along the rotor motion, with the blades being arranged so that the radial edge with the cutter is disposed at a certain distance in front of the radial edge of the adjacent blade, as viewed along the travel of the shield.

A disadvantage of such drifting shields is that they can be employed only for mining or drifting certain kinds of rocks (for example, clay, sand, etc.) for which their working member is designed.

It is an object of the present invention to provide a drifting shield of such a design as to insure the mining of rock ranging from a medium hardness to an unstable one, as well as, in case of the water level lowering, caisson or freezing, the mining of water-saturated rock.

This object is achieved due to the fact that the blades of the Working member are inclined from the center of the shield end part towards the side opposite to the mine face with the blades being preferably defined as helical surfaces, and each of the blades mounting tooth-shaped cutters arranged along the rear edge thereof as viewed along the rotor path.

Further objects and advantages of the invention will become more fully apparent to persans skilled in the art from the following detailed description of an embodiment thereof and the accompanying drawings, in which:

FIG. 1 is a side elevational view partly broken away of the proposed drifting shield;

FIG. 2 is a view of the shield looking in the direction of arrow A in FIG. 1; and

FIG. 3 is a view, taken along the line -I-I in FIG. 1.

3,467,439 Patented Sept. 16, 1969 The shield described herein consists of a body 1 (FIG. 1) having guides 2 on which is mounted a working member 3 of the rotary type. The front end part of the working member includes two blades 4 and 5 (FIG. 2) having helical surfaces inclined from the center of the shield end part towards the side opposite to the mine face so that these surfaces define an obtuse angle whose vertex is directed towards the mine face. The front edge of each blade (as viewed along the shield travel) is provided with a. cutter 6, and the rear edge-with removable toothshaped bits 7. The edges of the blades mounting the cutters 6 (FIG. 3) are disposed at a certain distance in front, as viewed along the shield travel, of the edges mounting the tooth-shaped bits 7.

The helical surface of the blades insures the breaking and taking of soft rocks, and simultaneously precludes the falling down of the rock. The teeth serve for the preliminary mining of rocks of medium hardness by cutting the rocks away from the mine face with the subsequent taking up of the loosened rock by cutters. Dependent upon the grade of rocks and the degree of its hardness, a lesser or larger number of teeth and cutters of various width is employed. The cutters 6 are made extensible, with the extension depending on the rock hardness.

In soft and unstable rocks, cutters are set flush with the edge, whereas in the case of hard rocks the cutters are extended towards the mine face. The cutters 6 operate also as loaders of the mined rock, directing it inside the rotor.

The rotor is driven by a reversible hydraulic jack-type drive 8 (FIG. 1).

To support the upper part of the mine face and insure its stability, the body 1 of the shield is provided with a removable lip 9 which makes it possible for the working member to operate in soft, unstable kinds of rock, with the diameter of the mine passed by the working member being smaller than the external diameter of the shield. The lip additionally cuts the rock above the level being passed by the working member, thereby providing for a free passage of the shield.

To insure the operation of the shield in stable rocks, the working member must work out the mine of such a diameter that it is equal to or greater than the diameter of the shield. In such a case, the lip is removed and the working member is displaced by the aid of jacks (not shown in drawings to) another elevation with respect to the shield axis. The depth of the mining is controlled by means of extensible bits 10.

The worked out rock is loaded onto a conveyer 11 by the cutters 6 and ribs 12 of the loading part of the working member. The shield is also provided with a means 23 for laying the tunnel lining.

The working member is moved for mining by hydraulic jacks 14 which, under condition of soft unstable rocks, press the helical surface of the working member to the mine face, thus preventing it from falling. The drifting shield is moved by hydraulic jacks 15 disposed in the body 1 thereof. To steer the shield, flaps 16 and a copy-bit or cutter 17 are provided.

We claim:

1. A working member of rotary type in a mechanized shield for underground mining, comprising at least two curvilinear blades defining the front end part of said working member; one cutter on the front radial edge, as viewed along the motion of the working member, of each of said blades; said blades being inclined from the center of the end part of said working member towards the side opposite to the mine face and said blades being arranged so that said radial edge with the cutter is disposed at a certain distance in front of the radial edge of the adjacent blade, as viewed along the shield travel.

2. The working member as claimed in claim 1, in which said blades are provided with a helical surface.

3. The Working member as claimed in claim 1, in which each blade mounts tooth-shaped bits arranged along the rear edge, as viewed along the motion of the working member.

4 4. A working member as claimed in claim 1 in which blades are installed on the rear end part for conducting the rock and delivering the rock to a loading part for the shield.

References Cited UNITED STATES PATENTS 94,669 9/1869 Tisdalc 175-396 1,065,874 6/1913 Kaukeinen 175-396 2,134,478 10/1938 Hollingsworth 299-56 X 2,798,707 7/1957 Kandle 299-90 x ERNEST R. PURSER, Primary Examiner US. Cl. X.R.

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