EP0161465A1 - Rotating body of a cutting head of a selective-cut heading machine - Google Patents

Abstract

A rotating body (3) of a cutting head of a partial cutting boring machine, which is equipped with chisels (50) and water nozzles (45), is designed in its outer area as a hollow body (15) extending from its end face in the direction of its shaft (8). Inside, it has an annular body (16) molded onto the hollow body (15) and extending back from the end face, with which it is fastened to the shaft (8) and over which it has a cover (17 or . 57) is closed. In the cavity (39) created between the hollow body and the annular body, pipes (37; 44 or 62, 44) for supplying the water nozzles (45) can be laid, which allow the use of particularly high water pressures.

Description

The invention relates to a rotating body of a cutting head of a partial cutting tunneling machine, in particular for mining tunneling, which sits at the end of a shaft oriented in the direction of advance ("longitudinal cutting head") or in a double, mirror-image arrangement sits at the end of a shaft oriented transverse to the direction of advance ("transverse cutting head" ) and is equipped with chisels and water jets.

A slitting head with such a rotating body is known, for example, from DE-OS 27 46 169. The water nozzles restrict the development of dust and cool the chisels and extinguish sparks that arise when they are arranged on the chisels. The water is fed to them through a system of cavities arranged in the construction of the rotating body.

Another possible use of the water nozzles is to contribute to the removal of the rock with sharp rays directed at the rock. For this purpose in particular, the water pressures have been increased to a few hundred bar in recent years.

The invention has for its object to a cutting head create that can be operated with a further increased water pressure.

According to the invention, this purpose is achieved with a rotating body of the type mentioned at the outset, which is designed in its outer region as a hollow body which extends from its end face in the direction of the shaft and in the cavity of which pipes for supplying the water nozzles are laid.

The hood-shaped hollow body, which has a narrower diameter on the front side, is initially widening and then bent back, held and rotated, represents an extreme construction not previously carried out with regard to the force absorption and the flow of forces. However, the way proves still as practicable and leads to the fact that all water nozzles, right down to the ones located near or on the end face, are accessible through the interior of the rotating body and can be supplied individually through pipes laid here. The individual lines allow much greater pressures than the previously used, in particular the welded, cavities of the rotating body construction itself. Feed lines to a group of individual lines each leading to a water nozzle can also be advantageously laid in the cavity, especially on the way to a central one via the end face Water supply must be connected.

The inside of the rotating body preferably has an annular body molded onto the hollow body and extending back from the end face, with which it is fastened to the shaft, preferably via a square, and over which it is closed on its end face by a cover.

The ring body, together with the hollow body to which it is molded, is a structure which, while maintaining as much cavity as possible, provides adequate support on the shaft. B. reach back to half the axial length of the rotating body - and rotatable connection to the shaft enables and despite the single transition from the ring body into the hollow body on the front side enough strength developed in itself.

Furthermore, the ring body offers the advantageous possibility of passing a water supply line through a central bore of the shaft in a further embodiment of the invention and arranging a water distribution at the end of the shaft within the ring body, from which a number of lines are arranged in a star shape through the ring body and / or Through the hollow body wall, each is led to a further water distribution, preferably arranged on the inside of the hollow body wall, from which a part of the water nozzles, preferably the ones located in the relevant angle section, are supplied.

So you have an accommodation of the central water distribution and the outgoing lines, which does not interfere with the mechanical concerns of the arrangement of the rotating body on its shaft, is easily accessible for assembly and disassembly and is absolutely protected by the cover mentioned on the front side of the rotating body.

In the case of the cross-cutting head, it is proposed in an advantageous embodiment of the invention to apply water distribution to only one of the angular sections mentioned, namely that which is directed forward in the direction of advance.

One could also counter the radiation ejection to the rear by a shield. However, apart from the strain on the shield, this would unnecessarily pollute the environment with a multiple of water that must be drained off.

Said water distribution expediently has a sleeve rotating on the water supply line / in which bores are arranged in a star shape, the inputs of which lie on the inner circumference of the sleeve at the level of a radial outlet of the water supply line and connected to their outputs, preferably on the end face, in star-shaped lines are.

The lines which continue in a star shape can be tubes which are laid through recesses in the ring body and / or the hollow body wall up to the further water distributions mentioned. However, they can also be bores in the lid mentioned and subsequently bores in the ring body, the lid at the connection points of the bores being sealed around the sleeve or the ring body around them.

Experience has to teach which of the two solutions deserves preference. The former solution could be the safer but more difficult from an assembly point of view. The latter solution could be more expensive; in practice, it still requires a pipe connection from the end of the bores in the ring body to the water distribution if, as suggested, it is arranged on the inside of the hollow body wall. However, the water distribution could also be arranged at the end of the ring body. However, it would be more difficult to access and more disturbing than on the hollow body, where it can and will be arranged close to the edge.

A particularly advantageous development of the invention consists in guiding the tubes for the direct supply of the water nozzles from the cavity mentioned through recesses in the hollow body wall into a nozzle seat in which the water nozzle itself is attached to the tube end.

This measure is made possible on the one hand by the hollow space of the hollow body and the pipes laid individually for each water nozzle in it, but on the other hand also facilitates this laying and has the main advantages of not requiring any further connection - always a weak point - and in contrast to the known nozzles to avoid further, larger rooms under water pressure.

• Fig. 1 zeigt einen Querschneidkopf mit zwei Drehkörpern in Ansicht von vorne.
• Fig. 2 zeigt in größerem Maßstab einen der beiden Drehkörper einschl. seiner Lagerung abgeschnitten und seinen Meißelbesatz im ganzen weggelassen in einem axialen Schnitt.
• Fig. 3 zeigt den Drehkörper von seiner Lagerung abgenommen und seinen Meißelbesatz sowie weitere Teile weggelassen in Halbdarstellung in einer Ansicht gemäß Fig. 2 von unten.
• Fig. 4 zeigt ein anderes Ausführungsbeispiel in einem Fig. 2 entsprechenden Schnitt.
• Fig. 5 zeigt das Ausführungsbeispiel nach Fig. 4 in einer Fig. 3 entsprechenden Ansicht.

The drawings show exemplary embodiments of the invention.

• Fig. 1 shows a cross cutting head with two rotating bodies in front view.
• Fig. 2 shows on a larger scale one of the two rotating bodies including its storage cut off and its chisel trimmings omitted in an axial section.
• Fig. 3 shows the rotary body removed from its storage and its chisel trimming and other parts omitted in a half view in a view according to FIG. 2 from below.
• FIG. 4 shows another embodiment in a section corresponding to FIG. 2.
• FIG. 5 shows the embodiment according to FIG. 4 in a view corresponding to FIG. 3.

The cross-cutting head 1 shown in FIG. 1 is seated in the usual way on the boom of a partial-section boring machine which can be pivoted up and down and to both sides. Its connection to the boom is on the back of the illustration on a base part 2 of the cutting head, on which the two rotating bodies 3 are mounted and in which the drive mechanisms for the rotating bodies are arranged.

As can be seen in FIG. 2, the base part 2 has an annular bearing part 5 for the rotating body 3 on an annular end wall 4. Ribs 6 stiffen the arrangement of the bearing part 5 on the end wall 4.

A shaft 8 is mounted in the bearing part 5 via two roller bearings 7 arranged at an angle to one another. It is held axially therein by a collar 9 on one end and a screwed-on retaining ring 10 on the other end in connection with the angular position of the roller bearings 7 relative to one another.

At the lower, broken-away end of the shaft 8 in FIG. 2, a gearwheel driven out of the cantilever mentioned and rotating the shaft 8 is connected. To transmit the torque, the shaft 8 is formed at the other end on a section 11 as a splined shaft. A seat ring 12 which rests on the periphery of the shaft and on the collar 9 and is screwed to it represents the seat of the rotating body 3 on the shaft 8. A ring 13 inserted at the end of the bearing part 5 has a seal 14 which rests on the rear side of the seat ring 12 and thus seals the space containing the roller bearings 7 from the rotating body 3.

The rotating body 3 consists essentially of a hood-shaped hollow body 15 and an annular body 16 integrally molded thereon, and a cover 17 which covers the hollow cross section of the annular body 16 and is fastened to the annular body 16 by means of screws 18.

The rotating body 3 is with the correspondingly shaped end of the ring body 16 is placed on the seat ring 12 and held by means of a screw ring 21 which engages in a thread 19 at the end of the shaft 8 and presses on an inner collar 20 of the ring body 16. Here sits between the inner collar and the seat ring 12 in a square recess 22 of the ring body 16, a square 23 which engages with a corresponding toothing in the section 11 of the shaft 8 designed as a splined shaft.

• Durch eine zentrale Bohrung 24 in der Welle 8 ragt ein Wasserrohr 25 in eine stirnseitige Ausnehmung 26 der Welle und bis über diese hinaus. Das Wasserrohr 25 ist am Ende durch einen Schraubeinsatz 27 dicht verschlossen und weist in Abstand davon eine Radialbohrung 28 auf, die durch eine Einfräsung am Umfang des Wasserrohrs auf einen Bogen von der Größe eines Achtelkreises erweitert ist. Eine hier mit dichter Passung auf dem Wasserrohr angeordnete Drehmuffe 29 ist in der Höhe der Radialbohrung 28 mit acht radialen Bohrungen 30 versehen, die jeweils durch eine axiale Bohrung 31 zur Stirnseite der Drehmuffe fortgeführt sind und dort an einem Rohranschluß 32 enden.

As a result of the described new design of the rotating body, with the cover 17 removed, the inside of the rotating body is accessible for carrying out the above assembly as well as for the following assemblies:

• Through a central bore 24 in the shaft 8, a water pipe 25 protrudes into an end recess 26 of the shaft and beyond it. The water pipe 25 is sealed at the end by a screw insert 27 and has a radial bore 28 at a distance therefrom, which is widened to an arc the size of an eighth circle by milling on the circumference of the water pipe. A rotating sleeve 29 arranged here with a tight fit on the water pipe is provided at the radial bore 28 with eight radial bores 30, each of which is continued through an axial bore 31 to the end face of the rotating sleeve and ends there at a pipe connection 32.

On the lower, retracted end of the rotary sleeve 29 in FIG. 2, a packing sleeve 34 enclosing a sealing packing 33 is placed from below. Both parts, the rotating sleeve 29 and the packing sleeve 34, are again surrounded by a sleeve 35. With the cover 17, screws indicated by the dash-dotted lines 36 pull the packing sleeve 34 onto the rotating sleeve 29 and fasten both to the cover 17.

From the eight pipe connections 32, eight pipes 37 extend in a star shape and lead through recesses 38 in the annular body 16 and the space 39 formed between the annular body 16 and the hood-shaped hollow body 15 to a water distributor 40 on the wall of the hollow body 15. The water distributor 40 consists of a ledge with an axially bored cavity 41, which at its entrance is connected by a pipe connection 42 to the pipeline 37 and, distributed over its length, has a number of outlets 43 which are designed as further pipe connections. Of these, a pipe 44 is placed in each case to a water nozzle 45. In the drawing, four outlets 43 appear on one side of the water distributor 40; on the other hand there are four exits or pipe connections. From the first of these pipe connections, the only pipe 44 shown in the drawing, out of a total of eight pipes, leads to eight water nozzles arranged in the relevant sector of the rotating body. The sector supplied in this way extends over an eighth of the rotary body circumference in accordance with the eight existing pipelines 37 and water distributors 40. However, a division into a larger or smaller number of sectors and an arrangement of a larger or smaller number of water nozzles in each sector than in the present example would also be possible. The arc, on which the radial bore 28 in the water pipe 25 is widened at the periphery, would then be enlarged or reduced accordingly, in such a way that only one sector is exposed to water.

The laying of the pipes 44 and the pipes 37, with the exception of their connection to the rotating sleeve 29, takes place in the unmounted state of the rotating body 3. The arrangement of the water distributors 40 near the edge of the hood-shaped hollow body 15 leaves everything necessary for connecting the pipes 44 and the pipe 37 Handling without difficulty. The space 39 present between the annular body 16 and the hood-shaped hollow body 15 makes it possible to accommodate and to lay the pipes 44 and pipes 37. The laying under the space conditions, which are nevertheless somewhat cramped in the depth of the space 39, is facilitated by the measure of guiding the ends of the tubes 44 through a recess 46 in the wall of the hollow body 15 into a nozzle seat 47, in one of them To hold ball joint 48 and screw the water nozzle 45 onto the pipe end itself: you simply push the pipe end through the recess 46 and the nozzle seat 47 so far that the outermost end protrudes, screw the water nozzle 45 onto the thread cut on it and press it They then go back to the nozzle seat, where they extend beyond the tube to the side creates. The ball joint 48 then allows adjustment. It can be designed so that it can then be clamped in the adjusted position, for example by a screw. A funnel-shaped cavity 49 below the nozzle seat gives the tube 44 the freedom necessary for the adjustment.

The nozzle seat 47 is, as is known per se, formed in a chisel holder 51 with a chisel 50.

Finally, to complete the description of the drawing, a seal 52 and a ring 53 screwed to the end wall 4, which together with the latter forms a type of labyrinth seal 54 at the edge of the hollow body 15 and also holds a sealing ring 55 within the latter, may be mentioned.

The operation of the rotating body can be seen from the above description without further explanation. We expressly point out the design of the water supply system for the water nozzles exclusively in the form of pipelines 37, 44 and bores 30, 31, 41 comparable to these.

• Die axiale Bohrung 31 in der Drehmuffe 29 mündet statt in dem Rohranschluß 32 einfach an der Stirnseite der Drehmuffe 29 aus und wird dann fortgesetzt durch eine Bohrung 56 in dem hier mit 57 bezeichneten Deckel. Der Übertritt ist von einem Dichtring 58 umschlossen. Im Anschluß an die Bohrung 56 im Deckel folgt, wiederum unter Abdichtung durch einen Dichtring 59, eine Bohrung 60 in dem Ringkörper 16. Von ihrem mit einem Rohranschluß 61 versehenen Ende führt dann eine Rohrleitung 62 zu dem Rohranschluß 42 des Wasserverteilers.

In the embodiment according to FIGS. 4 and 5, the pipes 37 are largely replaced by further bores compared to those according to FIGS. 2 and 3, otherwise the designs are the same:

• The axial bore 31 in the rotating sleeve 29 opens out instead of in the pipe connection 32 simply at the end face of the rotating sleeve 29 and is then continued through a bore 56 in the cover designated 57 here. The transition is enclosed by a sealing ring 58. Following the bore 56 in the cover, again with sealing by a sealing ring 59, follows a bore 60 in the ring body 16. From its end provided with a pipe connection 61, a pipe 62 then leads to the pipe connection 42 of the water distributor.

The arrangement described allows water pressures of up to 2,100 bar and more.

Claims (9)

1. rotating body (3) of a cutting head (1) of a partial cutting tunneling machine, in particular for tunneling in mining, which sits at the end of a shaft oriented in the direction of advance ("longitudinal cutting head") or in a double, mirror-image arrangement at the end of a shaft oriented transversely to the direction of advance ( 8) sits "cross cutting head" (1)) and is equipped with chisels (50) and water nozzles (45),
characterized,
that the rotating body (3) is formed in its outer region as a hood-shaped hollow body (15) extending from its end face in the direction of the shaft (8) and in the cavity (39) tubes (37; 44 or 62, 44) ) are installed to supply the water nozzles (45). 2. rotating body according to claim 1,
characterized,
that it has an integrally formed on the hollow body (15), from the front end extending back annular body (16) with which it is fastened, preferably via a square (23), to the shaft (8) and over which it is closed at its end by a cover (17 or 57). 3. rotating body according to claim 2,
characterized,
that the ring body (16) extends in the axial direction approximately to the center of the hollow body (15). 4. rotating body according to claim 2 or 3,
characterized,
that a water supply line (25) is passed through a central bore (24) of the shaft (8) and at the end of the shaft (8) within the ring body (16) a water distribution (28-31) is arranged, of which a number of Lines (37 or 56, 60, 62) are guided in a star shape through the ring body (16) and / or the hollow body wall (15) to a further water distribution (40), preferably arranged on the inside of the hollow body wall (15), from which a portion of the water nozzles (45), preferably the one located in the relevant angle section, are supplied. 5. rotating body according to claim 4,
characterized,
that in the case of the cross cutting head (1) the water distribution (28-31) affects only one of the angular sections, which is directed forward in the propulsion device. 6. rotating body according to claim 5,
characterized,
that said water distribution (28-31) has a sleeve (29) rotating on said water supply line (25), in which bores (30, 31) are arranged in a star shape, the inputs of which on the inner circumference of the sleeve (29) at the level of a radial outlet (28) of the water supply line (25) and are connected to their outputs, preferably at the end, star-shaped lines (37 or 56, 60, 62). 7. rotating body according to claim 6,
characterized,
that the star-shaped lines are pipes (37) which are laid through recesses (38) in the ring body (16) - and / or the hollow body wall up to the other water distributions (40) mentioned. 8. rotating body according to claim 6,
characterized,
that the star-shaped leads bores (56) in said cover (57) and then bores (60) in the ring body (16) and the cover (57) at the connection points of the bores (56) opposite each other the said sleeve (29) or the ring body (16) is sealed (58; 59). 9. rotating body according to one of claims 1 to 8,
characterized,
that the tubes (44) for direct supply of water nozzles (45) from said cavity (39) through recesses (46) in the hollow body wall (15) are guided into a nozzle seat (47) in which the water nozzle itself at the tube end (45) is set.

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