PL172259B1 - Cutter holder for coal miner cutter-heads - Google Patents

Abstract

A pick holder (2) for a shearer drum or a cutting head has a water nozzle (16) behind the pick (3). The water nozzle (16) is directed towards the point of the pick and/or near the point of the pick towards the mineral to be removed. The water nozzle (16) is arranged in a back chamber (22) open for the jet (25). It is inserted into the chamber (22) from the rear. With the water nozzle thus inserted, the chamber can be relatively narrow and deep so that the water nozzle is completely protected in it. An air inlet (23) in the form of at least one lateral opening (23) leads into the chamber (22). In this configuration, the jet of the water nozzle draws in air. A water/air spray jet of greater uniformity than the pure water spray jet develops. The greater uniformity enables the water consumption to be reduced at essentially the same cooling effect - the air portion of the water/air spray jet also provides a cooling action - and at the same or even improved quenching capacity for sparks. <IMAGE>

Description

The subject of the invention is a knife holder for a cutting drum or a cutting head of a mining machine or a machine for excavating pavements or tunnels, which comprises a water nozzle placed, in particular behind the knife, on the knife edge and / or near the knife blade, directed at the mineral to be discharged, whereby the water jet is disposed in a rearwardly offset chamber that is open to the flow and is seated on its rear side.

Knife holders with nozzles are known for their frequent use. Fixed by a threaded connection in the knife holder, preferably under a sheath behind the knife, the water nozzle serves to extinguish sparks and cool the knife blade and / or the simultaneously heated mineral. In addition, the stream generated by the water nozzle binds the resulting dust.

To combat dust, large nozzles are directed, in particular, at the rebate drum, which, according to DE-OS 36 06 996, intensively produce a dense water mist by drawing air in the shape of a water jet.

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Also these nozzles are advantageously placed under the protection of the knife, in particular below the knife holder which is threaded onto the thread.

There is known from the Polish patent description No. PL-120 113 a chuck tool for a chipping tool, which is equipped with a water nozzle. The water nozzle is located in the front part of the knife holder body and is inserted into it from the front. When the knife is loaded by the cutting resistance, water springs from the nozzle and hits the furrow carved by the knife, from where it is reflected on the knife.

There is also known, from DE-39 20 205 C1, a knife handle of the initially described type, which in the proposed solution consists of a base fuselage and a removable front part attached to it, in which a chamber is open to the flow. There is a water nozzle in this chamber which is thus protected.

The object of the invention is to increase the efficiency of the jet produced by the water nozzle.

Knife holder for a chipping drum or cutting head of a mining machine or a machine for drilling pavements or tunnels, which comprises a water nozzle located, in particular behind the knife, on the knife blade and / or near the knife blade, directed at the mineral to be drained away, the water nozzle located being in a rearwardly shifted chamber open to the flow in which it is seated on the rear side thereof, according to the invention is characterized in that it has an air inlet in the rearwardly facing chamber.

Preferably, the air inlet in the chamber is in the form of at least one side opening, so that air from the air inlet is sucked in by a stream from the water nozzle.

In order to obtain the spray jet, the chamber has a tapered section connected to the section of the cylindrical opening into which the water nozzle opens, preferably followed by the last cylindrical section again, and there are two opposing holes on the same axis, parallel to the axis of the groove drum, preferably with the same width as the chamber, both openings extending in the axial direction of the chamber approximately from the plane of the mouth of the water-nozzle to the tapering section.

The water nozzle is, more or less in the same way as hitherto mounted in the knife holder, screwed into the plug closing the chamber from the rear, to which plug is led the water nozzle supply system, which is connected to the channel hollow in the body of the knife holder.

The hexagonal or similar head with which the plug is provided in order to be screwed in remains to a greater extent protected against abrasion due to its rearward position. The replacement of the plug with the nozzle is practically always possible, while the previously screwed-in nozzle could be worn away so that it could not be gripped with the unscrewing tool.

Preferably, the supply system consists of an annular recess around the perimeter of the stopper, at least one radial opening extending from the annular recess and an axial opening into which a radial opening extends.

Preferably, the water nozzle has a recess on its rear side, in which the anti-pollution filter is mounted, preferably extending into the axial opening.

Thanks to the solution according to the invention, a water-air spray is created which is more uniform than in the case of a purely water spray. Greater uniformity allows to reduce water consumption with substantially unchanged cooling efficiency, since the addition of air to the water-air atomizing stream cools with the same or similar, or even greater, spark-extinguishing capacity.

Also the dust-binding effect is increased compared to the above-mentioned prior art, since the dusty air even closer to the point of origin, the knife blade, is sucked in and then mixed with the water.

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Moreover, in contrast to the state of the art, no dense water mist is produced, only a spray jet strongly bound and directed, but even and striking with less sharpness.

Ρτσα / Ί mmł

A CIA / UilUUl

ΙΜΙΠΓΙΓΧΠ’ΤηΐΛ-ΛΙΙ <4 · - »·« o .r,> ·. 1 -, -. <· Uniduv6j.uuj in ρΐΔ ^ ΔίαύΔΐν wj ^ uiiaiua on lpuiiaiua in which Fig. 1 shows an axial section of the knife holder, Fig. 2 - section along line II-II in Fig.

A knife holder 2 is welded to the spiral blade 1 of the rebate drum, the outer contour of which is shown in FIG. 1. A knife 3 is mounted in the knife holder 2, the fixing of which is not described in detail here.

The knife holder 2 has, on its lower side, above the opening 4 in the cover of the spiral blade 1 a flat recess 5, from which the channel 6 leads to the cylindrical opening 7.

A plug 9 is mounted in the cylindrical bore 7, screwed into the thread 8 cut at its end. The plug 9 is sealed at its outer end, where it abuts with a hexagonal head 10 from the outside against the knife holder 2 by means of a sealing ring 11, and at its inner end by means of a sealing ring 12 against the wall of a cylindrical opening 7. A channel 6 extends between them into an annular recess 13 on the circumference of the plug 9, from which four radial holes 14 extend to an axial opening 15.

A water nozzle 16 is screwed into the thread of the axle 15. It is located at the front with a hexagonal head 17 on the plug 9 and has a recess at the rear, in which the anti-pollution filter 19 is mounted extending up to the axle hole 15.

The section of the cylindrical opening 7 in front of the face of the plug 9 and the hexagonal head 17, with the following conical section 20, followed by a further end cylindrical section 21, is a chamber 22. Two opposite openings 23 for air inlets lead to the chamber 22.

The spray 24 emerging from the water jet 16 entrains the air flowing into the chamber 22 through the openings 23, so that a water-air spray 25 is produced, which is directed through the end cylindrical section 21 at the rear of the knife blade and flows over the knife blade.

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Publishing Department of the UP RP. Circulation of 90 copies. Price PLN 2.00

Claims (8)

Patent claims 1.Knife holder for a chipping drum or cutting head of a mining machine or a machine for drilling pavements or tunnels, which comprises a water nozzle placed, in particular behind the knife, on the knife blade and / or near the knife blade, directed at the mineral to be drained away, the nozzle being The water body is situated in a rearwardly shifted chamber open to the flow in which it is seated on its rear side, characterized in that it has an air inlet in the rearwardly facing chamber (22). 2. The handle according to claim A device according to claim 1, characterized in that the air inlet in the chamber (22) is formed by at least one side opening (23). 3. The handle according to claim 2, characterized in that it has two oppositely lying on the comijj MIF luwouigłpjj Ub uu u ^ ^ wn considered UWK / gu, aiwnuwjlW ^v O wujl jeuwiCu.wi uiwuiy {AJJ, preferably of the same width as the chamber (22). 4. The handle according to claim A device as claimed in claim 1, characterized in that the chamber (22) has a tapered section (20) connected to a section of the cylindrical opening (7) into which the water nozzle (16) opens, preferably followed by a cylindrical last section (21). 5. The handle according to p. A method according to claim 3 or 4, characterized in that the two holes (23) extend in the axial direction of the chamber (22) approximately from the plane of the mouth of the water nozzle (16) to a tapering section (2θ). 6. The handle according to p. 5. A plug (9) as claimed in claim 5, characterized in that the chamber (22) is closed at the rear by a screw cap (9), and the water nozzle (16) is seated in a plug (9), preferably screwed therein, to which plug (9) is led the supply system (13 - 15) of the water nozzle (16), which is connected to the channel (6) hollow in the body of the knife holder (2). 7. The handle according to p. 6. Device according to claim 6, characterized in that the supply system (13-15) consists of an annular spout (13) on the circumference of the plug (9), at least one radial opening (14) extending from the annular recess (13) and an axial opening (15). ) into which a radial hole (14) opens. 8. The handle according to p. 6. The nozzle according to claim 6 or 7, characterized in that the water nozzle (16) has a steep recess at its rear, in which the anti-pollution filter (19) is mounted, preferably extending into the axial opening (15).