DE2732285A1 - ROCK CUTTING PICKS - Google Patents

Description

PATE NTAMWAi-T E J. RTCHTER F. WERDERMANN

«PL-ING. ; DIPL ..- INS.

HAMBURe

R. SPLANEMANN dr. B. REITZNER

DiPL.-IN ©.

MONKS

lOOO HAMBURG M ^. July 1977

NEW WALL. IO TEL ·. (O4O) 34004S 34 OO αβ TELEeRAMMC: INVENTtUS HAMBURe

OUR ACTS: 3864 - I-3535 YOUR SIGN:

PATENT APPLICATION

PBIOBITiT:

23 "July 1976 No. 3o9o8 / 76 Great Britain 7 December 1976 No. 5to7? /? 6 Great Britain dated May 11, 1977 Kr. 19856/77 Great Britain

NAME: Rock cutting picks

APPLICANT: PABS ENGINEERING COMPANY LIMITED, London / England

ERPINDEB:

Sidney Ernest Proctor, Buckinghamshire / England

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Accounts. Deutsch Bank AQ Hamburg (BLZ 20070000) Account no. β / 10 065 Post check office Hamburg (BLZ 20010020) Account no. 2O0I0-201

The invention relates to a rock cutting pick, which consists of a pick body, the front edge of which is on one end of the pick body has a cutting tip, and a corresponding holder for such Rock cutting picks.

Known cutting picks for rock (so-called "cutter picks") such as coal cutting picks are in the generally attached to a pick block, for example from a milling chain link, a cutting drum or a tap block.

The known designs of rock cutting picks are not only costly to manufacture, they are not replace each other only with extremely high difficulties and with a corresponding structure.

The invention is therefore based on the object of creating a rock cutting pick which does not have these Disadvantages of known designs and is inexpensive to manufacture, and has a long service life.

The rock cutting pick proposed to solve the problem consists of a pick body, the front edge of which carries a cutting point at one end of the pick body, and is characterized according to the invention in that the pick body is attached to said End is provided with an upper part at its rear.

The rear surface of the pimple body can follow be drawn in on the inside and preferably V-shaped in cross-section. The whole pick body can also be in the Cross-section be V-shaped.

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The widest transverse dimension of the pick body is preferably equal to or greater than the corresponding dimension of the upper part. Preferably the upper one is standing Part in engagement with the uppermost part of the surface of the pick holder carrying the pick body. The underside of the upper part located on the rear side of the pick body can be provided with a recess and preferably with a slot.

According to a modified embodiment, the underside of the upper part located on the rear side of the pick body can have a protruding part such as a strip-like projection extending transversely to the underside of the upper part, one or more peg-like projections formed thereon, one or more pins which can be inserted through openings in the upper part and protrude from the underside of the same or one or more pins in bores be screwed in the upper part and provided from the underside of protruding screws.

The lower part of the pick body can be forked, this forked section being guided as far as a recess in the pick body. Advantageously are those leading to the recess in the pick body Fronts of the fork portion of the pick body arranged obliquely.

Furthermore, a bit holder is provided which has a leading edge for holding one at its one end with a Having a cutting tip provided pick body, wherein the largest dimension of the pick body transversely to the direction of forward movement of the same at the cutting tip

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or larger than the corresponding dimension of the bit holder.

The front edge of the bit holder can be provided with a protruding surface which against the inwardly indented rear surface of the pick body rests against it. This protruding surface has preferably a triangular cross-section, the inwardly drawn-in rear surface of the Pick body is formed in a corresponding shape.

The rock cutting picks, the pick body of which at one end has an upper part arranged at the rear carries, has at the upper part and at the upper end of the bit holder engaging devices, by means of which the uppermost portion of the pick body is held against the pick holder.

The underside of the upper part of the pick body can for example be provided with a recess which serves to receive a projection formed on the top of the bit holder. This recess on the The underside of the upper part is preferably of a slot-like shape and is used to receive a strip-shaped projection formed on the upper surface of the bit holder.

Instead, the upper end of the pick body can also be provided with a part protruding from its underside, which into a corresponding recess engages the surface of the bit holder. The protruding part can, for example, consist of a rod, which in a slot on the surface of the pecking

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holder engages, or one or more pin-like projections exist, which on the underside of the upper part are formed and engage in corresponding recesses in the surface of the bit holder. On the other hand, the protruding part can also consist of pins that can be inserted through openings in the upper part of the cutting pick and engage in recesses on the underside of the pick holder. Finally, the protruding part can also consist of one or more screwable into threaded bores of the upper part, protruding from its underside and into There are threaded holes in the surface of the bit holder screwed screws.

The pick body can be forked at its lower end, this section up to one Recess of the pick body is guided and the front edges of the forked section are inclined.

For fastening the pick body to the pick holder, there is preferably one held in a fixed position elastic body is provided which carries a rigid holder protruding therefrom, which is in engagement with the pick body behind its front edge.

The elastic body can be inserted into a recess of the bit holder, and the rigid holder can have a bar which can be brought into engagement with a first part with the recess of the pick body at its front edge.

Instead, the elastic body can also be inserted into a recess of a front edge of the pick body.

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be used ordered blocks, the rigid bracket from a protruding to the pick body Rod is made with a first crossbeam which can be brought into engagement with the pick body. This first one Crossbar is preferably inserted into the recess on the pick body.

Preferably, the rigid bracket carries a second crossbeam which can be brought into engagement with a tool allows the first crossbar to be pulled forward from the cutting pick, thereby removing the cutting pick To bring engagement with the bit holder.

Furthermore, a stop device can be arranged in front of the pick body, which one of the shape of her opposite pick body front surface has corresponding surface.

The pick holder preferably carries a pipeline arranged behind the pick body, by means of which Water can be supplied to the cutting surface of the cutting tip. This pipeline preferably consists of a reinforced metal tube that runs along the back of the Bit holder runs and is welded or brazed to this.

The rock cutting pick with holder proposed according to the invention is illustrated below with the aid of the FIGS Drawings illustrated embodiments explained in more detail.

Fig. 1 is a side elevational view of a coal cutting pick formed in accordance with the present invention.

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Figures 2 and 3 are cross-sections through the cutting picks, each along the line II-II or III-III of Fig. 1.

Figure 4 is a side elevation, partially in section, of a second embodiment a coal cutting pick with holder according to the invention, which is attached to a cutting drum.

Fig. 5 is a side elevation, partly in section, of another embodiment a coal cutting pick designed according to the invention with a holder, which is attached to a milling chain link.

Figure 6 is a side elevation, partially in section, of another embodiment a coal cutting pick designed according to the invention with a holder, which is attached to a tap block.

7 and 8 show a plan view and side view, respectively, of the in the embodiment according to FIG Fig. 6 bracket used.

Figure 9 is a side elevational view, partly in section, of another one made in accordance with the present invention trained coal cutting pick with holder, which by means of a stub shaft on a cutting drum is attached.

Fig. 10 is a partially sectioned, partially side elevational view of a modified one Embodiment.

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FIG. 11 is a cross section taken along line XI-XI of FIG. 10.

Figure 12 is a partially sectioned, partially side elevational view of a further coal cutting picks designed according to the invention.

Fig. 13 is a plan view of the in

Embodiment according to Fig. 12 bracket used.

In Figures 1, 2 and 3 of the drawings that is off Pick body 20 and upper part 21 shown existing coal cutting picks. The pick body 20 is in Cross-section V-shaped (see Fig. 2 and 3), while the upper part 21 (as can be seen from Fig. 2) has such a shape that it conforms to the inwardly drawn-in rear surface of the pick body 20 is. In this position, the upper part 21 is welded to the pick body 20, for example to the Places 22 and 23 is indicated.

The front edge is provided with a recess 24 in the lower area of the pick body 20 and is also forked, so that it forms the two legs 25. The front edges 26 of the two legs run as shown obliquely from the lower edge of the pick body 20 to the recess 24. At the top of the front edge of the pick body 20 there is a cutting tip 27 made of, for example, tungsten carbide or another hard metal. These The cutting tip 27 has a corresponding recess in the upper region of the front edge of the pick body 20 connected, preferably by welding or brazing.

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The embodiment shown in FIGS. 1, 2 and 3 ISBt change in different ways (see e.g. Figures 4, 5, 6 and 9). The upper part 21 of the cutting pick can be made from a single piece which is welded directly to the upper end of a knuckle iron serving as a pick body 20. The cutting tip 27 can then be welded or welded to the upper end of the pick body or to the upper part 21 be brazed. The cutting tip 27 can also be formed and assembled in one piece with the upper part be fastened with this at the upper end of the pick body 20.

From Fig. 4, the cutting bit holder can be seen. This consists of a bit holder 40, which in the direction of the arrow X is movably mounted and carries a cutting pick on its front edge, which at the front edge of the upper part 28 is provided with a tungsten carbide cutting tip 27 as shown.

The recess 24 at the lower end of the pick body 20 receives the crossbar 41 of a T-bolt, the Shaft 42 is provided at its other end with a shaft pin 43 which is made of an elastic plug Neoprene or rubber 44 is used, which is located within a recess 44 of the bit holder 40.

The neoprene or rubber stopper 44 is of one shown in FIG surrounded by a metal jacket, not shown.

The bit holder 40 is attached to a carrier 46 which, as shown in FIG. 4, can consist, for example, of a shearer drum. The lower end

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The shape of the bit holder corresponds to a corresponding recess in the carrier 46, and the bit holder 40 is, as indicated at 47, with the carrier 46 welded.

The bit holder 40 is machined on its front edge in a corresponding shape for receiving the Pick body 20 of the cutting pick, and provided in its upper surface with a recess into which a protruding peg 48 engages downwardly from the lower surface of the upper portion 28 of the cutting pick protrudes.

The downwardly protruding pin 48 engages in the recess on the top of the bit holder 40 and ensures that the upper end of the cutting pick is firmly secured to the holder. This design ensures that when the direction of rotation of the carrier 46 the cutting pick is not lifted from the front edge of the pick holder.

In practice, the bracket shown in Fig. 4 consists of two protruding pins 48 which are transverse to Forward movement direction of the bit holder 40 are arranged side by side. This increases the strength of the Bracket increased against torsional forces, which act to twist the cutting pick from the pick holder.

Once the bit holder is attached to the support 46 (at a desired angle) in its predetermined position has been, the cutting pick is placed on the front edge of the pick holder 40 and, for example, under

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With the help of a rawhide hammer brought down into their predetermined position. The crossbar slides 41 upwards at the inclined front edges 26 of the forked section and snaps into the recess 24.

The cutting picks are removed from the pick holder 40 by means of a tool, for example is designed in accordance with the tool 49 shown in FIG. 4 and is designed to be pivotable forwards away from the cutting pick.

The back of the bit holder 40 is provided with a reinforced metal tube 50, which as shown to is guided to a point located immediately behind the uppermost end of the cutting pick and into a Nozzle 51 runs out. When the cutting pick is in operation, water is supplied through the metal pipe 50 forming a pipeline and through the nozzle 51 onto that of the cutting pick cracked coal or rock injected. Due to this water supply, the coal dust development at the place of use degraded.

The holder shown in Fig. 4 can also be designed in a different way, as shown with reference to the other drawing figures.

FIG. 5 shows a cutting bit holder according to the invention, which is attached to a link of a milling chain is. All parts of this embodiment which correspond to parts of the embodiment according to FIG. 4 are here again denoted by the same reference numerals.

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As can be seen from Fig. 5, this differs Embodiment of that of FIG. 4 in the manner in which the cutting picks at their upper end on Bit holder 40 is attached. In the embodiment according to FIG. 5, the upper part 28 has the cutting pick a through recess 53, into which a roller pin 54 is inserted, which in a recess 55 engages at the upper end of the bit holder 40. The roller pin 54 is fitted into the recess 53 with a snug fit and held in the recess 55 by an elastic sleeve 56 as shown.

To place the cutting pick on the front of the pick holder, it is placed against its front edge and driven down by blows with a hammer until the protruding part, namely the crossbeam 41 of the holder, engages in the recess 24. The roller pin 54 is then inserted into the recess 53, so that it engages in the sleeve in the recess 55.

The arrangement shown in Fig. 5 can be modified in such a way that across the bit holder 40 two Pins are provided, whereby the resistance of the holder to forces is increased, which to this tend to twist the cutting pick away from the front of the holder.

In the embodiment shown in FIG. 6, the bit holder 40 is on a tap block (pin-on block) 60 attached, the with the embodiments of Fig. 4 and 5 common parts are again denoted by the same reference numerals.

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The upper part 28 of the cutting pick shown in FIG. 6 has a threaded bore 71 into which a Screw or bolt 62 is screwed in. The screw or bolt 62 is screwed so far into the threaded hole 61 that the end of the screw or of the bolt protrudes over the threaded hole 61 also down and into a threaded hole 63 on the upper Engages surface of the bit holder. Exactly as in the embodiment according to FIG. 5, two can also be used here such screws or bolts can be arranged side by side transversely to the bit holder to prevent rotation of the same to prevent in use.

In the embodiment of FIG. 6, the shaft is 42 the holder connected to a part 64, the one in the recess 24 on the front of the pick body engaging first section 65 and one located in front of this first section 65 and on both sides has the same extending second portion 66.

In the assembled state, the first section 65 engages in the recess 24 on the front of the pick body after it has passed over the inclined Leading edge 67 has been introduced into the cutting pick from the lower end thereof.

In this embodiment too, the cutting pick is attached to the pick holder 40 in such a way that initially the holder is inserted into the recess 45 of the bit holder so that the shaft 42 faces forward. then the back of the pick body is placed against the V-shaped front of the pick holder 40 and the Cutting pick driven so far down by means of a hammer that the first section 65 along the oblique

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extending leading edge 67 slides upwards and engages in recess 24. The shape of the inclined front edge 67 (which is different from the front edge 26 according to Figures 1, 4 and 5) on the legs of the forked lower Section of the pick body ensures that the The first section 65 is also retained by the recess 24 when the bit is inserted into the bit holder Neoprene or rubber stoppers will no longer be fully effective should so that the first section 65 can move within the recess 24.

The removal of the cutting pick from an arrangement according to the embodiment of Figure 6, a tool such as the tool shown at 68 which is forked at one end and has two angled arms 69 is used. For taking out a Cutting pick is the tool 69 as shown in Fig. 6 applied in such a way that the lower ends of the two angled arms 69 rest against the end of a pin or the front of another part 70, while the two arms 69 themselves behind the ends of the second section 66 grab.

The free end of the tool 68 is then pivoted in the direction of arrow Y, with the tool around the ends of angled arms 69 pivoted around engages the rear surface of section 66 and pulls the shaft 42 forward so far that the first section 65 disengages from the recess 24. As soon as the tool 68 has been pivoted sufficiently far in the direction of the arrow Y, around the first section 65 to pull out the recess 24, the cutting

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remove the peck from the peck holder.

In FIGS. 7 and 8, the holder used in FIG. 6 is shown in detail.

As can be seen from these drawing figures, the The shaft 42 is passed through the plug 44 and ends in a threaded section 71 which is inserted into a nut or a threaded plate 72 is screwed, which is located on one side of the neoprene plug 73, which of a metal jacket 74 is surrounded.

In this embodiment, the plug 73 has a sufficiently high flexibility to be sufficiently large To allow displacement of the shaft 42, thereby disengaging the first portion 65 from the recess 24 and so that the cutting pick can be removed from the pick holder 40.

In the case of the cutting bit holder shown in FIG. 9, parts already described are again with the same Reference numerals denoted. The upper part 28 of the cutting pick has a drawn in on its underside Slot 90 which is transverse to the direction of advance of the bit holder. This slot is used for Receiving a strip-like projection 91 formed on the upper surface of the bit holder. The lower The end of the bit holder 40 has, as shown in FIG. 9, such a shape that it is in a conventional Bit holder can be used.

The embodiment of FIG. 9 permits cutting pecking currently in use by the invention to replace trained cutting picks. The pick holder

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according to Fig. 9 in particular has a stub shaft 92 for an existing, rectangular or circular Pick recess 93. As shown, the picking recess 93 can, however, also be in a cutting drum 94 be formed in a carrier of any other training.

The embodiments of the holder described above can be varied within the scope of the inventive idea modify. For example, in FIGS. 10 and 11 there is an arrangement with a stop device 100, which is arranged immediately in front of the front edge of the pick body 20. The stop device has a V-shaped slot formed by the surfaces 101, which corresponds to the shape of the pick body is equivalent to.

The particular advantage of such an arrangement is that if the bracket deteriorates due to wear, which holds the lower part of the cutting pick against the front edge of the pick holder, a twist the cutting pick around its upper end (with its lower end protruding from the front of the bit holder) prevented by the front of the pick body to abut against the surfaces 101 of the anchor device got.

FIGS. 12 and 13 show a modified embodiment of a holder arranged in front of the cutting pick shown. In this embodiment, the stopper 44 of the holding device is located in a recess 120 of a block 121, which is arranged in front of the front of the pick body 20.

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The shaft 42 extends rearwardly towards the pick body and terminates in a holder 122 which a first transverse bar 123 received by the recess 24 in the pick body and one in front of the holder 122 arranged second transverse bar 124, which extends transversely to the direction of movement of the cutting pick.

As can be seen in particular from FIG. 13, in this embodiment the plug 44 is opposite to that in the Figures 7 and 8 modified embodiment described, and the shaft 42 is connected to a shaft pin 125, which is completely surrounded by a neoprene or rubber stopper 126. The neoprene or rubber plug 126 is surrounded by two metal jacket halves 127 as shown.

The holder shown in Figures 12 and 13 can be removed from the recess 24 by means of, for example Take out a tool that corresponds to the embodiment shown in FIG.

In all of the embodiments of the cutting tool holder described here, those that occur during normal operation are Load forces absorbed by the cutting pick and due to their special shape, as well the shape of the front edge of the bit holder 40 is for the most part directly transferred to the bit holder, so that this is pressure loaded. Because of this feature, the service life of the bit holder is significantly increased compared to known bit holders, in which the stress forces lead to a stretching or stretching of the Halters lead.

In all of the embodiments described here, the cutting tip is made as wide as possible,

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while at the same time the overall dimensions of the overall arrangement are kept relatively small, with the result that the cutting pick and the holder can be produced relatively inexpensively.

The simple structure also contributes to economic production costs for the bit holder 40. The width of the holder is dimensioned so that it does not go over the cutting drum or the otherwise used one on either side Support protrudes, a particular advantage resulting from the fact that the bit holder is not wider than the width of the cutting picks attached to it (at least in the area in which the cutting picks cuts in rock or coal) so that the pick holder 40 is not abraded by the excavated rock or coal can be.

In known rock bit holders, the holder by means of which the cutting pick is attached to the bit holder is, normally arranged in front of the cutting edge of the cutting pick, whereas with those described here Arrangements the holder can be arranged completely behind the front edge of the cutting pick, whereby a more reliable attachment of the pick body of the cutting pick to the pick holder is achieved.

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Claims (27)

Patent claims: 1. Rock cutting pick, consisting of a pick body, the front edge of which has a cutting point at one end of the pick body, characterized in that the pick body (20) is provided at the said end at its rear with an upper part (21, 28). 2. Stone cutting pick according to claim 1, characterized in that the rear surface of the pick body (20) is drawn inwards. 3. Stone cutting pick according to claim 1 or 2, characterized in that the pick body (20) in cross section Is V-shaped. 4. Stone cutting pick according to one of claims 1-3, characterized in that the widest transverse dimension of the pick body (20) is equal to or larger than the corresponding dimension of the upper part (21, 28). 5. rock cutting pick according to any one of claims 1-4, characterized in that the underside of the Rear side of the pick body (20) located upper part (28) with a recess and in particular a slot (90) is provided. 6. rock cutting pick according to any one of claims 1-4, characterized in that the underside of the Rear side of the pick body (20) located upper part (28) is provided with a protruding part. 709884/0908 7. rock cutting pick according to claim 6, characterized in that the projecting part consists of a transversely to the underside of the upper part (28) extending strip-like projection (91). 8. rock cutting pick according to claim 6, characterized in that the projecting part consists of one or a plurality of pin-like projections (48) formed on the underside of the upper part or one or several, insertable through openings in the upper part and protruding from the underside of the same Donation consists. 9. rock cutting pick according to claim 6, characterized in that the projecting part consists of one or several, can be screwed into bores (61) in the upper part (21) and protrudes from the underside thereof Screws (62) consists. 10. Stone cutting pick according to one of claims 1-9, characterized in that the lower part of the pick body (20) is forked and this forked section is guided up to a recess (24) in the pick body. 11. Stone cutting pick according to claim 10, characterized in that the leading to the recess (24) Front sides (26) of the fork section of the pick body (20) run obliquely. 12. Stone cutting pick according to one of claims 1-11, characterized in that the cutting tip (27) consists of a tungsten carbide insert attached to the pick body (20). 709884/0908 13. Rock cutting pick according to one of claims 1 -12, characterized in that a leading edge for Holding the pick body (20) having pick holder (40) provided and the largest dimension of the Pick body transversely to the forward direction of movement of the pick body at the cutting tip (27) is the same or is larger than the corresponding dimension of the bit holder. 14. Stone cutting pick according to claim 13, characterized in that the front edge of the pick holder (40) consists of a projecting surface, which is particularly triangular in cross section and which is directed towards a A retracted surface, particularly V-shaped in cross-section, rests on the rear side of the pick body. 15. Rock cutting pick according to claim 13 or 14, characterized characterized in that the upper part (21, 28) of the pick body (20) and the upper end of the pick holder (40) are provided with engagement devices by means of which the uppermost portion of the pick body against the bit holder is held. 16. Rock cutting pick according to claim 15, characterized in that the underside of the upper part (28) of the Pick body is provided with a preferably slot-shaped recess (90) which is used for receiving a on the top of the bit holder (40), preferably strip-like projection (91) is used. 17. Rock cutting pick according to claim 15, characterized in that the upper part (21) has one of its Protruding underside, into a recess in the 709884/0908 27322B5 has upper surface of the bit holder (40) engaging, protruding portion. 18. Rock cutting pick according to claim 17, characterized in that the projecting part consists of a rod or one or more peg-like projections or pins, which are inserted into a slot or corresponding recesses in the upper surface of the Intervene with the bit holder. 19. Rock cutting pick according to claim 17, characterized in that the projecting part consists of one or several, in threaded bores (61) of the upper part (28) can be screwed, protruding from the underside and consists of screws (62) screwed into threaded bores (63) in the surface of the bit holder (40). 20. Stone cutting pick according to one of claims 13-19, characterized in that the pick body (20) on its lower end bifurcated and this section up to a recess (24) of the pick body is led. 21. Stone cutting pick according to claim 20, characterized in that the leading up to the recess (24) Front surfaces (26) of the forked part of the pick body run obliquely. 22. Stone cutting pick according to one of claims 13-21, characterized in that for fastening the pick body (20) to the pick holder (20) one in one Fixed position held elastic body (44) is provided which carries a rigid holder (42, 122) projecting from this, which with the pick body 709884/0908 -T- is engaged behind the leading edge. 23. Stone cutting pick according to claim 22, characterized in that the elastic body (44) is inserted into a recess (45) of the pick holder (40), and the rigid holder (42) has a bar (41) which is connected to a first part with the recess (24) the pick body can be brought into engagement behind its front edge. 24. Stone cutting pick according to claim 22, characterized in that the elastic body (126) is inserted into a recess (120) of a block (121) arranged in front of the front edge of the pick body (20), and the rigid mount (122) comprises a shaft (42) protruding toward the pick body and having a first one There is a cross bar (123) which can be brought into engagement with the recess (24) of the pick body. 25. Rock cutting pick according to claim 23 or 24, characterized characterized in that the rigid holder (122) can be brought into engagement with a tool (68) for Pulling the first crossbar forward from the pick body for the purpose of releasing the same from a pick holder serving second crossbar (124). 26. Rock cutting pxcke according to one of claims 13 - 25, characterized in that in front of the pick body (20) a stop device (100) is arranged which has a surface (101) corresponding to the shape of the opposite pick body pervorder surface. 70988Λ / 0908 27. Stone cutting pick according to one of claims 23-26, characterized in that the pick holder (40 ) carries a reinforced metal tube (50) welded to the rear of the pick holder behind the pick body (29), through which water to the cutting surface of the cutting tip (27 ) is available. 709884/0908