WO1999029456A1

WO1999029456A1 - Cable saw with at least two simultaneous sawing cable shafts

Info

Publication number: WO1999029456A1
Application number: PCT/EP1998/008021
Authority: WO
Inventors: Wolfgang Mayer
Original assignee: Wolfgang Mayer
Priority date: 1997-12-09
Filing date: 1998-12-09
Publication date: 1999-06-17
Also published as: DE19754520A1

Abstract

A cable saw for cutting blocks of stone (33,34) into slabs, having a supporting frame (1) which can move in relation to the blocks of stone, rotationally mounted deflection pulleys (7,8), and a sawing cable (9) which can move continuously on said deflection pulleys (17, 18) and is provided with two cable shafts (17,19). Both cable shafts (17,18) are arranged next to each other, perpendicular to the relative movement of the stone block (5), in order to carry out simultaneous sawing.

Description

ROPE SAW WITH AT LEAST TWO SIMULTANEOUSLY CUTTING ROPES

The invention relates to a wire saw for sawing stone blocks in slabs according to the preamble of claim 1.

In the known wire saws, the rope usually runs around two deflection rollers and a tensioning roller, the strand of rope running between the deflection rollers sawing the workpiece (see, for example, EP 0 543 138 B1, DE-U 90 01 537, US Pat. No. 2,866,448), or it two deflection rollers are provided, one of which forms the tensioning roller, the two rope strands being aligned with one another in the feed direction of the workpiece between the two deflection rollers, so that only the rope strand facing the workpiece saws (see, for example, DE 44 06 034 C2).

Nowadays, the service life of the sawing ropes is mainly limited by the fatigue that leads to the rope tearing after a certain time. Because of the limited lifespan of the saw cables, circular saws are generally used for sawing stone blocks into slabs. The depth of cut of a circular saw is limited by the radius of the saw blade minus the mounting flange. Since stone blocks are often of considerable size, circular saws for sawing the stone blocks therefore require a correspondingly large amount of space. In addition, the saw blade must be precisely aligned.

In order to be able to cut several plates from a block of stone at the same time, saw frames are known in which several saw cables with parallel cutting debris are each guided around two deflection rollers with tensioning rollers. The sawing ropes are different due to various parameters, such as the uneven stone composition

Speed of rotation of the ropes around their longitudinal axis and others more, exposed to different wear. If a rope has been torn and replaced, it can happen that another rope breaks shortly afterwards, etc. That means that tearing and changing the individual ropes at different times result in correspondingly long downtimes, which lead to a significant reduction in production speed being able to lead.

The object of the invention is to provide a wire saw for sawing stone blocks, in which the saw wire is considerably more efficient and which moreover has a higher production speed.

This is achieved according to the invention with the wire saw characterized in claim 1. Advantageous embodiments of the invention are given in the subclaims.

The limited lifespan of a saw rope is primarily due to its fatigue due to the bending stress when it circulates around the pulleys. The sawing wire of the wire saw according to the invention is also subject to this bending stress. However, since in the wire saw according to the invention two wire debris are arranged side by side transversely to the relative stone block movement direction, sawing can be carried out with both wire debris simultaneously. This practically doubles the performance of the wire saw until the saw wire has to be replaced. In addition, the production speed when sawing stone blocks is doubled compared to a conventional rope saw with only one sawing rope strand.

In the device according to the invention, the stone block to be sawn can be mounted on a support fixed on the floor, while the wire saw can be moved. Of course it only happens on the relative movement between the wire saw and the stone block. This means that it is also possible to arrange the stone block on a movable carriage and the wire saw to be stationary. The direction of the relative movement between the wire saw and the stone block is therefore referred to as the relative workpiece movement direction. In the wire saw according to the invention, the support frame of the wire saw is designed such that the stone blocks can be moved through the wire saw or the wire saw can be moved over the stone blocks. A relative vertical movement between the wire saw and stone block can also be provided. This means that the stone block can be stationary, for example, and the wire saw can be moved downwards when sawing.

Several embodiments of the wire saw according to the invention are explained in more detail below with reference to the drawing. In it show:

1 and 2 are a front and side view of a first

Embodiment of the wire saw; 3 and 4 are a front view and a plan view of a second

Embodiment, • FIGS. 5 and 6 show a side view of the embodiment according to FIGS. 3 and 4 in two different pivot positions of the deflection roller carriers;

7 shows a section through a wedge device;

Figure 8 is a partial view of Figure 3; 9 schematically shows a further embodiment of the wire saw in perspective reproduction; and

10 and 11 schematically show a fourth embodiment of the wire saw with several parallel, simultaneously cutting rope runs in plan view and side view.

1 and 2, the first embodiment of the wire saw has a support frame 1 with two columns 2, 3. The columns 2, 3 are arranged inclined, i.e. they run obliquely from top to bottom in the direction of feed of the stone blocks according to arrow 4. The sloping columns 2, 3 are supported by supports 5. With their lower end region they are arranged in a pit 6.

Between the two columns 2, 3, a deflection roller 7, 8 is arranged above and below, over which a saw cable 9 runs endlessly. The deflection rollers 7, 8 are mounted on plate-shaped supports 13, 14, which are laterally on the two columns 2,

3 are attached.

The one, upper deflection roller 7 forms a tension roller. For this purpose, it is slidably mounted on the carrier 13 and by a pneumatic cylinder 15 or the like. loaded into the cocked position.

The other, lower deflection roller 8, which is arranged in the pit 6, is driven by a motor 16. The two axes of rotation 11, 12 of the deflection wheels 7, 8 run parallel to one another. The two deflection wheels 7, 8 also have the same diameter. Thus, the rope 9 has two parallel rope debris 17, 18 in the stone block feed direction

4 offset, that is arranged side by side. With the two rope debris 17, 18 can thus be sawn simultaneously.

In order to absorb the cutting pressure, the cable guides 13, 14 are attached to each cable strand 17, 18 on the mutually facing sides of the cable guide heads 21 to 24.

Each cable guide head 21 to 24 has, as illustrated by the cable guide head 22 in FIG. 2, a plate-shaped cable guide carrier 25 on which a cable guide roller 26 absorbing the cutting pressure and a counter pressure roller 27 which is spring-loaded on the cable guide roller 26 are rotatably mounted. The counter pressure roller 27 prevents the saw cable 9 from slipping on the cable guide roller 26, in particular when cutting the stone blocks.

Slides 28, 29 are provided for the supply of stone blocks. According to FIG. 1, a guideway 31, 32 for the slides 28, 29 is assigned to each sawing rope run 17, 18, the slides 28, 29 being moved on the guideways 31, 32 above the lower rope guide heads 23, 24.

1 and 2, narrow, high stone blocks 33, 34 can be sawn into panels. The slides 28, 29 are provided with corresponding receptacles 35, 36, between which the stone blocks 33, 34 are arranged. Each carriage 28, 29 is provided with a carriage 35, 36 on the left and right of the sawing strand 17 and 18 assigned to it and divided in the feed direction according to arrow 4 such that the respective strand 17, 18 when sawing through the carriage 28, 29 can step through.

Due to the inclined arrangement in the stone block feed direction according to arrow 4, which runs obliquely from top to bottom the two cable debris 17, 18 first enter the front upper edge of the stone blocks 33, 34 (FIG. 2), so that the cutting pressure gradually increases when the stone blocks 33, 34 are cut.

In the embodiment shown in FIGS. 1 and 2, the two sawing rope debris 17, 18 lie in a plane which runs transversely to the stone block feed direction 4, i.e. the rope debris 17, 18 are aligned with one another in the cross-sectional view shown in FIG. 2. They are thus offset transversely to the stone block movement direction 4, but not along the stone block movement direction 4. However, it is also possible to arrange the two sawing rope strands 17, 18 lengthwise, i.e. offset in the stone block movement direction 4, i.e. to arrange the support frame 1 or the supports 13, 14 so as to be rotatable about an axis extending from the top downward and parallel to the cable debris 17, 18. The offset arrangement of the cable strands 17, 18 transversely to the feed direction 4 can thus be changed, that is to say their distance from the longitudinal center plane 39 of the cable saw.

The embodiment according to FIGS. 3 to 6 differs from that according to FIGS. 1 and 2 primarily in that the two sawing rope strands 17, 18 run horizontally.

3, the support frame 1 is designed as a portal. This means that the two columns 2, 3 are connected to one another at the upper end by a cross strut 41.

On each column 2, 3, a carriage 42, 43 is guided up and down on guides 44, 45 with an actuator (not shown). A carrier 46, 47 is articulated on each carriage 42, 43 about a pivot axis 48 parallel to the rope axes of the two sawing rope debris 17, 18. The deflection rollers 7, 8 are mounted rotatably about the axes of rotation 11, 12 on the supports 46, 47 designed as plates. An actuator 50, 51, for example a hydraulic cylinder, which is articulated on the one hand on the carrier 46 and 47 and on the other hand on the carriage 42 and 43, is provided for adjusting the pivoting angle of the supports 46, 47 (cf. FIGS. 5 and 6). .

As in the embodiment according to FIGS. 1 and 2, in the embodiment according to FIGS. 3 to 6 rope guide heads 21 to 24 are also provided at both ends of the sawing rope debris 17, 18. The cable guide heads 21 to 24 according to FIGS. 3 to 6, however, in contrast to those according to FIGS. 1 to 2, can be displaced vertically in the direction of arrow 52, that is to say perpendicular to the relative workpiece movement direction according to arrow 4. For this purpose, the two cable guide supports 25 for the two cable debris 17, 18 are fastened on one or the other side of the support frame 1 to a common holder 53, 54, each holder 53, 54 being displaceable on one or the other with push rods 55, 56 Deflection roller carrier 46, 47 is mounted. The push rods 55, 56 can e.g. can be moved back and forth in the direction of arrow 52 by a working cylinder or the like.

Due to their displacement, the cable guide heads 21 to 24 can be moved as close as possible to the stone block 57. An exact cut is thus possible by a slight deflection of the cutting rope debris 17, 18 in the stone block 57.

In order to be able to take up the cutting pressure vertically in each case, the cable guide heads 21 to 24 can be attached to the holders 53, 54 be rotatable about an axis of rotation parallel to the rope axes of the cutting debris 17, 18. The cable guide heads 21 to 24 can either be rotated manually about these axes or automatically by a rotary drive, not shown. The rotational position of the cable guide heads 21 to 24 can also be coupled by coupling with the movement of the carriers 46, 47 about the pivot axis 48.

The carrying frame 1 has a chassis 58, 59 on both sides. The carriages 58, 59 can be moved on rails 61, 62.

The stone block 57 to be sawn is mounted on a support 63, for example made of squared timbers, in a stationary manner on the floor. Any number of workpieces can be arranged one after the other on the floor between the travel rails 61, 62 and can be cut one after the other without the cable saw coming to a standstill. A high production speed is thus achieved by the wire saw according to the invention.

So that the cable guide roller 26 can rotate with the cable 9 without slippage, it is provided on its running grooves (not visible in the drawing) with a coating which has a corresponding static friction, for example a plastic coating. The cable guide rollers 26 are therefore subject to radial wear. That is, the cable debris 17, 18 move axially over time, as shown in FIG. 8 by the dashed line 17 ', towards the axis of rotation 64 of the cable guide roller 26.

5 and 6, the rope strand 17 'is no longer aligned with the running groove 65 in the deflection roller 7. That is, the rope strand 17' can come out of the running groove 65 jump out, at least due to its offset position, damage the deflection roller 8 in the region of the raceway 65 by abrasion such that the deflection rollers 7, 8 become unusable.

In order to prevent this, an adjusting device is provided in the embodiment according to FIGS. 3 to 6 with which a common tangent of the running grooves of the cable guide rollers 26 and the running grooves 65 of the deflecting rollers 7, 8 is set as a function of the radial wear of the cable guide rollers 26.

For this purpose, the cable guide roller 26 is slidably mounted on the cable guide support 25 perpendicular to the cable run 17, as indicated by the arrow 66. The adjustment can be done automatically. For this purpose, an actuator (not shown) for moving the cable guide roller 26 in the direction of arrow 66 is provided, and also a spacer 67 on the cable guide support 25, which measures the distance to the cable run 17 without contact, that is to say, for example, inductively or capacitively. If the distance of the rope run 17 from the distance transmitter 67 deviates from a predetermined target value, the distance transmitter 67 controls a control device (not shown) which actuates the actuator such that the cable guide roller 26 restores the desired distance between the distance transmitter 67 and the rope run 17.

As shown in FIG. 4 by lines 68, natural stone blocks have a certain structure due to deposits. For optical and strength reasons, such a block may therefore only be cut lengthwise into plates, as indicated by lines 69 in FIGS. 5 and 6.

Such stone blocks 57 have a length of, for example, 4 m, a width of, for example, 1.5 m and a height of, for example, 1.80 m. To In the prior art, such a block is placed upright and transversely with a wire saw, for example according to EP 0 543 138 B1, with a horizontal sawing saw wire moving from top to bottom for sawing into panels.

The cutting rope strand thus has a relatively long length of e.g. more than 4 m. This results in a correspondingly large deflection of the cutting rope runs in the stone block when cutting. This deflection extends the cutting time by the so-called free cutting time, which is necessary so that the sheet remaining by the deflection at the end of the cutting process is cut through.

In addition, the strand of rope must be returned upwards after cutting the block through the cutting gap. Since the rope swings, it can damage the smooth cutting surface.

With the wire saw according to the invention, the possibility is now created to cut a stone block 57 horizontally along the lines 69, 70 into plates. This allows short rope debris 17, 18 from e.g. can be set a little more than 1.80 m between the movable cable guide heads 21 to 24, whereby the free cutting time is shortened accordingly. On the other hand, the rope 9 then no longer needs to be returned through the cutting gap after the block 57 has been cut through.

So that the cable debris 17, 18 are not pinched in the cutting gaps 69, 70 when the stone block 57 is sawed horizontally, two wedge devices 71 are fastened to each holder 53, 54. As shown in FIG. 7, each wedge device 71 can have a magazine 72 with stacked wedges 73, furthermore a slide 74, which in each case lowermost wedge 73 of the stack when moving the support frame 1 in the direction of arrow 4 at a distance into the cutting gap 69, 70 in the stone block 57. The keying devices 71 are fastened between the two cable guide heads 21, 22 and 23, 24 on the holding plates 53, 54, as can be seen from FIG. 4. 5 and 6, since two cutting gaps 69, 70 are formed simultaneously, two such wedge devices 71 must be provided on each side for inserting the wedges 73 into the two cutting gaps 69, 70.

As mentioned, the stone block 57 is preferably cut across its width. If it is to be cut along its length, a turntable 75 can be provided as illustrated in FIG. 4. With the turntable it is also possible to machine the stone block 57 on each side.

The plates cut from the stone block 57 with the wire saw according to FIGS. 3 to 6 have a horizontal position after cutting. In this position, they are usually stored and reworked, for example with a grinding machine.

As can be seen from FIGS. 5 and 6, the distance a between the cutting gaps 69, 70 and thus the thickness of the plates cut out from the stone block 57 can be determined by the angle at which the supports 46, 47 are pivoted about the pivot axis 48 .

The device according to FIGS. 4 to 6 can alternatively also be designed such that the supports 46, 47 are designed to be movable vertically up and down. As indicated in FIG. 4 by the block 57a shown in dashed lines, can then be used each cutting strand 17, 18 a plate from both blocks 57 and 57a are cut off simultaneously.

In the device according to FIG. 9, the saw cable 9 runs over three deflection rollers 80, 81, 82 and 83, 84, 85 on one or the other side of the stone block 33. The two parallel rope debris 17, 18 which cut at the same time run over the lower ones , the block 33 facing deflection rollers 80, 81 and 83, 84 with mutually parallel axes of rotation 80 ', 81' and 83 ', 84'. Due to the fact that with their axes of rotation 82 'and 85' perpendicular to the axes of rotation 80 ', 81', 83 ', 84' above the deflection rollers 80, 81, 83, 84, the deflection rollers 82 and 85, which can also be designed as tensioning rollers, are used the rope 9 is fed from the deflection pulleys 80, 83 or 81, 84 of the one rope run 17 or 18 to the deflection pulleys 81, 84 or 80, 83 of the other rope run 18 or 17. The device according to FIG. 9 is lowered according to arrow 86 from above onto the stone block 33 in order to saw it.

In the same way, the device according to FIGS. 10 and 11 is lowered onto the stone block 33. The device according to FIGS. 10 and 11 has a total of five parallel, simultaneously cutting rope debris 87 to 91, which have deflection rollers 92, 95, 96, 99 and 100 on one and opposite deflection rollers 93, 94, 97, 98, 101 the other side of the stone block 33 are arranged. The deflection rollers 92 to 101 also have parallel axes of rotation. Between each pair of deflection rollers 92, 93; 94, 95; 96, 97; 98, 99 and 100, 101 for the individual rope ruins 87 to 91, the rope is alternately on one or the other side of the stone block 33 to the deflection rollers by deflection rollers 103 to 106 facing away from the stone block 33 with axes of rotation perpendicular to the deflection rollers 92 to 101 92 to 101 redirected. Via the deflection rollers 108 and 109 above the deflection rollers 103 to 106, the cable 9 is returned from the roller 92 to one end of the cutting debris 87 to 91 arranged in a meandering shape.

Claims

claims

1. Rope saw for sawing stone blocks in slabs with a support frame that can be moved relative to the stone blocks, deflection rollers rotatably mounted on the support frame and a rope that runs endlessly over the deflection rollers, characterized in that the rope

(9) has at least two parallel, simultaneously cutting rope debris (17, 18).

2. Cable saw according to claim 1, characterized in that two cutting cable debris (17, 18) for simultaneous sawing transversely to the relative stone block movement direction (4) are arranged offset next to one another.

3. Rope saw according to claim 2, characterized in that the two sawing rope debris (17, 18) are provided between two deflection rollers (7, 8).

4. Rope saw according to claim 2 or 3, characterized in that the two sawing rope debris (17, 18) in the relative stone block movement direction (4) are arranged obliquely from top to bottom.

5. Cable saw according to one of claims 1 to 4, characterized in that the sawing cable debris (17, 18) perpendicular to the relative stone block movement direction (4) in alignment.

6. Cable saw according to one of claims 1 to 4, characterized in that the sawing rope debris (17, 18) in the relative stone block movement direction (4) are arranged offset from one another.

7. Cable saw according to one of the preceding claims, characterized in that for the relative movement of the stone blocks (33, 34) relative to the support frame (1), the support frame (1) is arranged in a stationary manner and at least one slide (28, 29) for supplying the stone blocks (33, 34) to the two sawing rope debris (17, 18) is provided.

8. A wire saw according to claim 7, characterized in that the carriage (28, 29) above the lower deflection roller

(7) is movable.

9. A wire saw according to one of the preceding claims, characterized in that the support frame (1) has at least two columns (2, 3), a support (14, 15, 46, 47) being arranged on each column (2, 3) , on which one or the other deflection roller (7, 8) is rotatably mounted.

10. A wire saw according to one of the preceding claims, characterized in that a wire guide head (21 to 24) is provided for each of the two sawing wire strands (17, 18) on each support (46, 47).

11. A wire saw according to claim 1, 2, 3, 9 or 10, characterized in that the two sawing rope debris (17, 18) run horizontally.

12. A wire saw according to claim 9 and 11, characterized in that the carriers (46, 47) are each arranged on a carriage which is guided up and down on the respective column (2, 3).

13. Cable saw according to one of the preceding claims, characterized in that the cable guide heads (21 to 24) on the supports (13, 14, 46, 47) are mounted displaceably transversely to the relative direction of the block movement (4).

14. A wire saw according to one of the preceding claims, characterized in that each wire guide head (21 to 24) has a wire guide roller (26) absorbing the cutting pressure and a counter pressure roller (7) which are rotatably mounted on a wire guide carrier (25).

15. Rope saw according to claim 14, characterized in that an adjusting device for setting a common tangent of the grooves of the rope guide roller (26) on each sawing rope run (17, 18) and the grooves (65) of the deflection rollers (7, 8) depending on the radial wear of the cable guide rollers (26) are provided.

16. Cable saw according to claim 15, characterized in that the cable guide rollers (27) are each slidably mounted with an actuator perpendicular to the cutting cable strand (17, 18) on the respective cable guide support (25) and a spacer (67) for the cable strand to be cut (17, 18) is provided on the respective cable guide support (25) which controls a control device which actuates the actuator for adjusting the cable guide roller (26).

17. Rope saw according to claim 12, characterized in that the carriers (46, 47) on the respective carriage (42, 43) around one of the rope axes of the two sawing rope remains (17, 18) parallel axis (48) are pivoted.

18. Cable saw according to claim 17, characterized in that an actuator for adjusting the pivoting angle of the carrier (46, 47) is provided.

19. Cable saw according to one of the preceding claims, characterized in that the support frame (1) is designed to be movable.

20. Rope saw according to one of claims 9 to 19, characterized in that on both sides of the stone block to be sawn (57) in each case a wedge device (71) for inserting wedges (73) into the through the two horizontal rope debris (17, 18) sawn saw column (69, 70) is provided.