摘要:
A water spray system particularly, but no exclusively, for mineral mining, comprising a pick (1) having an integral shank (4) by which it is releasably receivable in an aperture (17) of a block (16), a heel (7) extending rearwardly from the pick (1), a hole (9) passing through the heel (7) and a pair of spaced-apart cheeks extending beyond the hole, a spray nozzle (24) received in a bore (22) of the block (16) with a head (25) of the nozzle projection above an upper surface of the block (16) to a location between the cheeks (8), with a water discharge orifice of the head (25) so located beneath the heel (7) and with respect to the through hole (9) of the heel (7) that water discharged from the orifice into the through hole and exiting the through hole induces an air flow wholly or partially through the through hole. Other aspects of the invention are the pick (1), the block (6), a releasable latching system, and a drivable member.
摘要:
A cutting tool assembly including a bit holder having a forward portion, a rearward portion, and a generally planar mounting surface between the forward and rearward portions. The forward portion defines a front aperture having an axis inclined relative to the mounting surface, and the rearward portion defines a rear aperture open to the front aperture. A cutting bit is mounted in the front aperture and includes a rearward end accessible through the rear aperture of the bit holder rearward portion.
摘要:
A core breaker for use with a continuous mining machine used to cut earth strata wherein the continuous mining machine has at least two spaced apart cutting drums whereby each one of the cutting drums cuts the earth strata leaving a core. The core breaker includes an elongate support positioned mediate of the two cutting drums. In one aspect, the elongate support includes a channel formed therein. The core breaker further includes a plurality of tool components attached to the elongate support. The core breaker also includes a plurality of spray nozzles positioned adjacent to the tool components. In one aspect, the plurality of spray nozzles each have a first end in fluid communication with the channel formed in the elongate support and a second end positioned adjacent an outer surface of the elongate support. The tool components may be, for example, a breaker wedge or a cutting tool such as a conical bit.
摘要:
A water spray unit is provided, to be located in a receiving bore provided in a pick box. The unit comprises an elongate nozzle portion and a fastener for the nozzle portion. The nozzle portion has an internal water receiving chamber and a water inlet orifice communicates with the chamber. At one end of the nozzle portion, a water discharge orifice communicates with the chamber. An external screw thread is provided on the fastener and drive surfaces on the fastener serve to screw or unscrew the fastener. One end of the nozzle portion is distal from said fastener and terminates in a nose having a frustoconical sealing surface, adapted, in use, to be forced by the fastener, into tight, water sealing engagement with a complementary frustoconical seat of the receiving bore. The invention also includes a pick box provided with such a water spray and a rotary cutting head provided with such a pick box.
摘要:
A cutting apparatus includes a fixed holder and an orientable holder. The fixed holder is mounted to a cutting drum, and the orientable holder receives a cutting bit which may either be a forward attack bit or a conical bit. Orientation of the bit is accomplished by alignment of the orientable holder with respect to the fixed holder and by alignment of the bit with respect to the orientable holder. In a preferred embodiment, the fixed holder includes a block and liner, and the liner may assume either of two positions with respect to the block. The orientable holder includes passages and grooves for allowing a spray jet and hose to be received in the orientable holder to spray liquid on the cutting bit. The cutting surface of the bit includes two separate cutting tips, and the bit may be oriented to engage either tip with the material to be cut.
摘要:
A mineral cutter tip 14 comprises a bottom face 15 and a rear face 16 located in "V"-formation whereby the tip 14 is, in use, seated in a "V"-notch 7 provided in a head 2 of a mineral cutter pick 1, the tip 14 further comprising a front cutting face 17 and, reawardly thereof, a water-conveying slit or slot 20 provided intermediate opposed, lateral side faces 19 of the tip 14, and having a water inlet end 23 emerging at the rear face 16 of the tip 14 and a water outlet end 24 emerging at the top face 18 of the tip 14. The invention also includes a pick 1 provided with a tip 14 as defined.
摘要:
A mineral cutter pick is mounted in a holder. Passages in the pick and the holder supply fluid to an opening near the pick cutting edge. Sleeves are provided in the adjacent ends of the passages in the pick and holder and receive the opposite ends of a tubular connector. At least one of the sealing sleeves has its outer face exposed to the fluid supply pressure so that sealing with the associated end of the connector is assisted by the pressure force. The ends of the connector are formed as spherical enlargements to allow free pivoting in their sleeves and at least one end is axially displaceable in its sleeve while maintaining sealing contact.
摘要:
For cutting rock by means of cutting head (1) having its bits (24) cooperating over a limited axial shifting stroke (a) with a cylinder-piston-aggregate, for example a valve (18), it is proposed to intermittently subject the cylinder-piston-aggregate to the action of pressurized fluid, thus exposing the bit (24) during its engaging the rock to percussion forces. During the phases lacking any action of pressurized fluid onto the cylinder-piston-aggregate, the bit (24) shall be pushed into its starting position. This embodiment can be realized with both hydraulic and pneumatic cylinder-piston-aggregates, noting that in case of an embodiment having a hydraulic cylinder-piston-aggregate it is preferred to design this cylinder-piston-aggregate as a valve (18) which simultaneously provides the possibility to expel pressurized liquid via a spraying nozzle (32) onto the mine face. (FIG. 2)
摘要:
A bit holder equipped with a spraying device, comprising a receiving bore (2) in which the bit shaft (3) is supported, for limited axial shifting movement and optionally for being rotated, shifting movement of the bit shaft (3) in direction of the cutting pressure being limited by abutment (5) and the bit shaft being loaded by a return force in opposite direction to the cutting pressure and a valve (10, 11) for the supply of water to the bit or to the working or drift face during cutting operation being arranged within the bit holder (1) and being opened under the action of the cutting pressure by the axial shifting movement of the bit shaft (3). The valve housing (9) is inserted into the receiving bore (2). The rear end of the bit shaft (3) acts directly on the shaft (12) of the valve cone (10). Within the mantle of the receiving bore (2) and in front of the valve housing (9) there are provided passages (16) through which contaminations entering into the receiving bore (2) along the bit shaft (3) can be discharged in outward direction before they can arrive at the valve seat (11). The shaft (12) of the valve cone (10) is preferably guided within the valve housing (9), so that contaminations are rinsed in outward direction through the passages (16) by the leakage water flowing therethrough.
摘要:
Disclosed is a holder for the attachment of cutters or bits, to mining and tunnelling machines, which has at least one spray nozzle for coolant spraying of the cutter working area. The holder comprises means for receiving the cutter shank in the holder, an insert sleeve surrounding the cutter shank inserted with axial play in the means for receiving the cutter shank and a shut-off member carried on the insert. The shut-off member engages into a coolant supply line to the spray nozzle when a pressure load is applied to the cutter and shuts off the coolant supply when there is no load on the cutter.