GB2128230A

GB2128230A - Mining equipment for driving a mine working

Info

Publication number: GB2128230A
Application number: GB08327040A
Authority: GB
Inventors: Friedrich Wilhelm Paurat; Roland Paurat
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-10-09
Filing date: 1983-10-10
Publication date: 1984-04-26
Also published as: DE3237555C1; GB2128230B; GB8327040D0

Abstract

Equipment for driving a mine working (1) has self-advancing roof support members (2) each with a roof shield, a floor shield (4), bracing cylinder-and-piston units (5) and a forward cutting unit (6) extending over the breadth of the intended working and feeding on to a rearwardly moving conveyor (7), and mounted on two mounting arms (11) to swivel on a manipulating frame (10) fitted with manipulating cylinder-and-piston units (12) and linked to the roof support members (2), by means of driving cylinder-and-piston units (14). The two mounting arms (11) also being provided with an equal-advance controller, consisting of a torsion bar (16) connecting the mounting arms to each other. <IMAGE>

Description

SPECIFICATION Mining equipmentfordriving a mine working This invention relates two mining equipment for driving a mine working, for example, cutting through between two roadways and having self-advancing roof support members each with a roof shield, a floor shield, bracing cylinder-and-piston units and a forward cutting unit,which extends over the breadth of the intended cutting, feeds on to a rearwardly moving conveyor and is swivellably mounted on a manipulating frame by means oftwo mounting arms and manipulating cylinder-and-piston units attached thereto, while the manipulating frame is linked to the roof support members by means of driving cylinderand-piston units.In equipment ofthis type, the forward cutting unit can consist of a single cutting roll disposed between the mounting arms. On the other hand, the cutting unit can incorporate a plurality of cutting rolls, one of which is for example disposed between the mounting arms while others project outwards beyond the mounting arms. As a rule, the arrangement is such thatthe forward cutting unit, together with the manipulating frame, is disposed obliquelytothe direction of driving.

In the known equipment of this type (DE-PS 2847 909), the forward cutting unit is moved towards the floorortowardsthe roof by actuating the manipulating cylinder-and-piston units. This system has proved sound; it provides a simple means of driving a mine working, provided that when the forward cutting unit is raised by the manipulating cylinder-and-piston units to conform to the thickness of the rock strata, the cutting resistance is the same overthe entire length of the forward cutting unit. If notthe case,the forward cutting unithasatendencyto advance faster in the region where the cutting resistance is lower, therebytransmitting moments to the equipment as a whole.In principle, this could be counteracted by urging the manipulating cylinder-and-piston units in opposite directions, but this would necessitate costly monitoring and control circuitry to apply the countercontrol in proportion to the transmitted moment.

In this context, the object of the invention isto provide mining equipmentfordriving a mine working and to ensurethat disturbing moments arising from variations in the cutting resistance, as just described, are no longer transmitted to the equipment.

According to the present invention, the two mounting arms are additionally provided with an equaladvance controller comprising a torsion bar connecting the mounting arms directly or indirectly to each other. The torsion bar can be a solid member.

However, the torsion bar is preferably a hollow member, i.e., a torsion tube. The bar has to sustain a twisting moment about its axis but must never experience a bending moment along its axis. This can be ensured in various ways. One way isforthe torsion bar to be attached directly to the mounting arms coaxially with the axis of swivel of the mounting arms in the manipulating frame. Another way isforthe torsion barto have rigidly attached lever arms in the same planesasthe mounting arms and linked to the mounting arms by means of guide links which are attached by connecting hinges to the mounting arms and the lever arms. It is preferred to attach the mounting arms to the forward cutting unit near the ends thereof.

The accruing advantages are to be seen in that even if the equipment in accordance with the invention encounters variations in cutting resistance as the forward cutting unitis raisedthetwo mounting arms will move as it were synchronously, and disturbing moments will no longer betransmittedtotheequip- mentasawhole. On the contray,theywill be absorbed bythetorsion bar, which bringsabouttheequal- advance control ofthe mounting arms and simul taneouslykeepstheforcesoutsidethe remainder of the equipment.

An embodiment ofthe invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure lisa plan view of mining equipment in accordancewith the invention, inthe course of driving a gallery upwards; Figure 2 is a side view of part of Figure 1, looking in the direction of the arrow A; and Figure 3 is a perspective view, on a much larger scale than that of Figures 1 and 2, ofthe equal-advance controller members.

The mining equipment shown in the Figures is intended for driving a mine working, e.g. a cut 1 through between two roadways (not shown). In basic construction, it incorporates self-advancing roof support members 2 each with a roof shield 3, a floor shield 4, bracing cylinder-and-piston units 5, and a forward cutting unit6,which extends over the breadth of the intended cut 1 and feeds on to a rearwardly moving conveyor 7. The forward cutting unit 6, with its cutting roll 8, is disposed obliquelyto the direction of driving, which direction is indicated by the arrow 9 in Figures 1 and 3, and is mounted on a manipulating frame 10, the arrangement being such thattheforward cutting unit 6 is swivellably mounted on the manipulating frame 10 by means of two mounting arms 11 and manipulating cylinder-and-piston units 12 attached thereto.The swivelling motion leadsto lifting and lowering, as indicated by the double-headed arcuate arrow 13 in Figure 2 that the cutting can be adjusted to variations in the thickness of the rock strata. The manipulating frame 10 is linked to the roof support members 2 by means of driving cylinder-and-piston units 14, whose operation controlsthe driving motion.

The two mounting arms 11 are provided with an equal-distance controller 15, which consists of a torsion bar 16 connecting the mounting arms 11 directly to each other and formed by a hollow bar, i.e., a torsion tube.

Figure 3 shows in more detail the bearings and supports 17 which form parts of the manipulating frame 10. It will be seen that the torsion bar 16 has rigidly attached lever arms 18 in the same planes as the mounting arms and linked to the mounting arms 11 by means of guide links 19which are attached by connecting hinges20,21 to the mounting arms 11 and the lever arms 18. When the manipulating cylinder and-piston units 12 are actuated,theforward cutting unit 6 moves in the arc shown by the double-headed arcuate arrow 22 in Figure 3. By virtue ofthe equal-advance controller 15,thetwo mounting arms 11 move as it were synchronously, even when widely disparate reaction forces are set up nearthe ends of the forward cutting unitforexample, which forces, in the absence ofthe equal-advance controller 15 would transmit a moment into the manipulating frame 10 and hence into the equipment as whole.

Cutting through refers, as is well known, to those mine spaces which must be excavated before a face unit with a cutting machine and a conveyor can be installed and work along the face. As a rule, such a cutting starts from a roadway, and may extend as a connection between two headways. In general, such a cutting is several metres in breadth.

Claims

1. Mining equipment for driving a mine working, having self-advancing roof support members each with a roof shield, a floor shield, bracing cylinder-andpiston units and a forward cutting unit, which extends over the breadth of the intended cutting, feeds on to a rearwardly moving conveyor and is swivellably mounted on a manipulating frame by means oftwo mounting arms and manipulating cylinder-and-piston units attached thereto, while the manipulating frame is linked to the roof support members by means of driving cylinder-and-piston units, and the two mounting arms are additionally provided with an equaladvance controller comprising a torsion bar connecting the mounting arms to each other.

2. Equipment as in Claim 1, wherein the torsion bar is a hollow member.

3. Equipment as in either of Claims 1 and 2, wherein the torsion bar is attached directly to the mounting arms coaxially with the axis of swivel of the mounting arms in the manipulating frame.

4. Equipment as in either of Claims 1 and 2, whereinthetorsion bar has rigidly attached lever arms in the same planes as the mounting arms and linked to the mounting arms by means of guide links which are attached by connecting hinges to the mounting arms at one end and the leverarmsattheotherend.

5. Equipment as in any one of Claims 1 to 4, wherein the mounting armsaredisposednearthe endsoftheforward cutting unit.

6. Mining equipmentfordriving a mine working substantially as hereinbefore described with reference to the accompanying drawings.