AU9145398A

AU9145398A - Anchor boring and setting device

Info

Publication number: AU9145398A
Application number: AU91453/98A
Authority: AU
Inventors: Erich Brandl; Reinhard Neuper; Kurt Schaffer
Original assignee: Voest Alpine Bergtechnik GmbH
Current assignee: Sandvik Mining and Construction GmbH
Priority date: 1997-09-16
Filing date: 1998-09-15
Publication date: 1999-04-05
Anticipated expiration: 2018-09-15
Also published as: ZA987793B; ATA155897A; WO1999014463A1; EP1015733A1; AU740995B2; AT407553B

Description

- 1 Anchor Boring and Setting Device The invention relates to an anchor boring and setting device for boring and setting anchors in the longitudinal center 5 plane of a tunneling or mining machine in the roof, wherein the tunneling or mining machine comprises at least one support near the mine face, which is braceable between the roof and the floor and is articulated to the front end of the machine and hinged to the rear part of the machine by connecting rods 10 extending in the longitudinal direction of the machine. When driving roadways, a defined anchor pattern has to be observed in order to ensure the safety of the rock. To this end, it is known to position anchor boring and setting devices 15 outside the contour of the top view on an advance working or cutting machine, such anchoring or roof bolting having to be realized as close to the mine face as possible, in particular if drawrock is to be feared, in order to keep the unsupported or unsecured region as short as possible. Such anchor boring 20 and setting devices may be connected with the cutting or advance working machine in order to thereby safeguard the desired position near the mine face at predetermined distances relative to the mine face. Devices of this type are described, for instance, in AT-392 119, in which the anchor boring and 25 setting devices are articulately connected with the cutting machine and hydraulically braceable between the roof and the floor of the track. Another way of articulately connecting anchor boring and setting devices with an advance working machine may be taken, for instance, from DE-Al 33 34 975. In 30 that known configuration, the anchor boring and setting devices are laterally connected with an advance working machine via articulated arms and can be braced between roof and floor. Such a device renders feasible a largely parallel operation, since in that case it will do to disengage the 35 respective positioning actuator for the adjustment of the correct position of the anchor boring and setting device in order to ensure the free mobility of the articulated arm

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e) - 2 relative to the cutting machine, wherein the anchor boring and setting devices upon bracing between roof and floor remain secured in their selected position so as to allow for the obtainment of accordingly precise anchor bores. 5 All of the known devices, which in the main are to enable parallel operation, so far, however, always have allowed anchor bores to be set only outside the contour of the top view on the tunneling machine and, in particular, laterally 10 outside that contour, if such anchor bores are to be provided near the mine face. Yet, the distance between such lateral anchor bores is relatively large, in particular with advance working or cutting machines including relatively wide cutter rolls, wherefor additional bores have to be provided centrally 15 for setting a socalled center anchor in order to guarantee the safety of the rock. With hitherto known devices, it has been possible to arrange such center anchors only by means of separate anchor boring and setting devices at large distances behind the advance working machine, no parallel or largely 20 automated operation immediately following track progression, thus, being feasible by means of the known devices. A tunneling or mining machine of the initially mentioned kind, by which, however, anchors likewise can be set only outside 25 the longitudinal center plane, is described in GB-A 2 232 429. In that known device, the movable advance working or extraction machine comprises a front support which is articulately connected with the front end of the frame of the machine. The support, which extends between the floor and the 30 roof, is additionally connected with the rear end of the machine via connecting rods, the anchor boring and setting devices being arranged on the support laterally outside the pivoting path of the cantilever arm. The cantilever arm, which in most cases also carries the driving motor for the cutter 35 rolls, is relatively wide-structured so as to enable anchor bores to be provided only relatively far outside of the center A4 4Uj - 3 of the track and anchors to be set only outside of that track center. The invention now aims to improve such a machine as may be 5 taken, for instance, from GB-A 2 232 429 with a view to enabling also central center anchor bores to be drilled as close to the mine face as possible and center anchors to be set near the mine face. To solve this object, the configuration according to the invention essentially consists 10 in that the anchor boring and setting device in a manner pivotable about an axis extending transverse to the longitudinal direction of the machine and fixable in the pivoted position is connected with at least one connecting rod extending in the longitudinal direction of the machine. By the 15 anchor boring and setting device being fastened to at least one of the connecting rods extending in the longitudinal direction of the machine so as to be pivotable about an axis extending transverse to the longitudinal direction of the machine, it has become possible to provide anchor bores closer 20 to the mine face, wherein it is, furthermore, feasible even when using long anchor drill rods and long anchors to assume an accordingly low-structured transport position, to which end the anchor boring and setting device can be pivoted, for instance, substantially parallel to the connecting rods. When 25 lowering the front support and hence pivoting the connecting rods for the front support into a position substantially parallel with the floor, also the anchor boring and setting device can be pivoted into such a position so as to Abtain a low-structured machine easy to maneuver. 30 According to a preferred further development of the anchor boring and setting device according to the invention, the configuration is devised such that the connecting rod extending in the longitudinal direction of the machine 35 comprises two substantially parallel arms and that the anchor boring and setting device is pivotably mounted on a carrier connecting said arms. It is suitable for reasons of shock 411 )r- -4 decoupling, in particular when using parallel arms for guiding the front support, if the two arms are hinged separately to the roof bolt, whereby a free space is created between such arms, into which free space the anchor boring and setting 5 device can be pivoted in an out-of-operation position. Due to the hinged articulation of the connecting rods or arms, respectively, to the front support, it may happen under high stresses during operation that the two arms are being pivoted 10 relative to each other. In order to ensure also in those cases that the carrier for the anchor boring and setting device, on which the anchor boring and setting device is pivotably mounted, will not be overstressed, the configuration advantageously is devised such that the carrier is connected 15 with the arms via joints. The articulation of the carriers for the anchor boring and setting device in a structurally particularly simple manner may be devised such that the arms on their inner sides facing 20 each other carry pins or bearing eyes extending parallel to the arms and that the carrier comprises bearing eyes encompassing the pins or pins projecting into the bearing eyes, thereby simultaneously providing also the option to displace the anchor boring and setting device with the carrier 25 in the longitudinal direction of the connecting rods or connecting rod arms, respectively, in the manner of a slide, and position it accordingly. Depending on the free space available taking into account the pivoted position of the cantilever arm for the cutting tools, the anchor boring and 30 setting device, thus, may even be further approached to the mine face. In principle, the anchor boring and setting device may be employed in a direction substantially perpendicular to the stratification, i.e. under the formation of bores that are orthogonal to the longitudinal axis of the track, wherein, of 35 course, also any desired pivoted position of the anchor boring and setting device is feasible in order to obtain anchorages closer to the mine face.

- 5 Further decoupling and securing of the carrier against overstressing in the event of strong vibrations may be achieved in that at least one bearing eye is designed as a 5 longhole the longer axis of which extends in the direction of, or parallel to, the plane stretched by the arms. This will bring about a compensating effect if the parallel arms of the connecting rod are elastically widened, for instance on account of high stresses. 10 In order to achieve long and deep anchor bores, the configuration in a particularly advantageous manner is devised such that the anchor boring and setting devices are arranged on slides displaceable relative to each other in a telescopic 15 manner, one of which is pivotable about the axis extending transverse to the carriers and is connected with a pivoting actuator so as to be fixable in its pivoted position. In order to ensure simple handling also for long anchors and provide for the space required for the insertion of the anchors, the 20 configuration advantageously is devised such that the pivot axis of the anchor boring and setting device, which extends transverse to the longitudinal axis of the machine, is arranged on a site facing away from the mine face and located behind the horizontal pivot axis of an cantilever arm for the 25 cutting tools, in particular cutter rolls. Behind the horizontal pivot axis of the cantilever arm is also arranged, on a relatively low level, the central conveyor, which has to be pivoted from the longitudinal axis of the machine in other known constructions in which center anchors are set behind the 30 machine, so that an appropriate free space is safeguarded for the insertion of anchor rods and the arrangement of drill rods. In the following, the invention will be explained in more 35 detail by way of an exemplary embodiment schematically illustrated in the drawing. Therein, Fig. 1 is a schematic side view of a machine according to the invention, Fig. 2 Z ()'6 - 6 illustrates a detail of the support and the articulation of the anchor boring and setting device to the connecting rods of the support, and Fig. 3 represents a section along line III III of Fig. 2. 5 Fig. 1 illustrates an advance working machine 1, whose cantilever arm 2 is pivotable about a substantially horizontal axis 3 in the direction of the double arrow 4. The cutting tools are comprised of cutter rolls 5, said cutter rolls 5 10 being pivotable between the floor 6 and the roof 7. The footing 9 of a support 10 via a connecting rod 8 is hinged to the machine frame to the front end thereof near the mine face, wherein the support 10 via a connecting rad 11 extending in the longitudinal direction of the machine is hinged to the 15 rear part of the machine frame 12 so as to be pivotable about a pivot axis 13. The connecting rod 11 carries a bearing eye for an anchor boring and setting device not illustrated in detail in Fig. 1, which bearing eye is schematically indicated by 14. 20 The cutting machine, furthermore, comprises a tracklaying truck 15, the rear end of the conveying means being denoted by 16. The pivoting actuator for pivoting the cantilever arm 2 in the direction of the double arrow 4 is denoted by 17. 25 From the illustration according to Fig. 2, it is apparent that the connecting rod 11 is comprised of two substantially parallel arms 18, which are connected to a roof bolt 20?by means of joints 19. The rear articulation axis again is 30 denoted by 13, the rear end of the machine part again being denoted by 12. Between the two arms 18 there is arranged a carrier 21, to which the anchor boring and setting device is hinged so as to 35 be pivotable about a pivot axis 23. The pivoting actuator is denoted by 24, the anchor boring and setting device 22 itself being designed as a telescopic means whose slides, which are - 7 telescopically displaceable relative to each other in the longitudinal direction, are denoted by 25 and 26. The pivot axis 23 in the representation according to Fig. 1 is located behind the horizontal pivot axis 3 of the cantilever arm 2 5 such that the lower end of the anchor boring and setting device 22 in the completely extracted or completely lowered position may be lowered relatively far into the interior of the machine, thus enabling even long anchor rods and long drill rods to be safely inserted. The parking position, in 10 which the sled 25 is pivotable substantially parallel to the plane stretched by the arms 18, is schematically indicated by broken lines. The carrier 21 in that case is fastened to the arms 18 by 15 means of pins, whose pin axis is denoted by 27 in Fig. 2. A detail of this articulation of the carrier to the arms 18 is apparent from Fig 3. In Fig. 3, the schematically indicated anchor boring and setting device 22 again is mounted in the bearing eye 14 so as to be pivotable about the axis 23. The 20 carrier 21 comprises bearing eyes 29, which encompass pins 30, whose axes are again denoted by 27. The pins 30 are connected with the arms 18 by means of suitable brackets 31. As depicted in Fig. 3, one of the bearing eyes 29 includes a 25 longhole 32 in a manner that the pin 30 is movably retained in said longhole in order to be able to take into account elastic widening of the arms 18 without destroying the bearing of the carrier 21. 30 In the main, the device according to the invention renders feasible the appropriate anchorage even.of a center bolt or center anchor simultaneous with the cutting operation as extraction and cutting continue, wherein lateral anchors may additionally be introduced in a conventional manner, for 35 instance by means of anchor boring and setting devices arranged in the front support. The articulated arrangement of RA4/, the anchor boring and setting device on the longitudinal Lu- - 8 struts or connecting rods of the machine support allows for the correct height adjustment, on the one hand, and the pivoting into a parking position aimed to ensure a particularly small height for the displacement of the machine, 5 on the other hand. The articulated integration of the anchor boring and setting device in the center region of the machine allows for such anchors not only to be set in a manner perpendicular to the 10 stratification but also to be introduced in a slanted position relative to the roof. As already mentioned, the two arms of the connecting rod are able to shift in the vertical direction during the regular 15 cutting operation with an appropriate balance being safeguarded by the special design of the mounting of the carrier on the arms of the connecting rod. On the whole, the anchor boring and setting device according to the invention in association with the supporting means allow for the setting of 20 a center anchor already at a short distance from the mine face without any modifications being required at the conveying means as has been the case with the configuration according to WO 96/17155.

Claims

1. An anchor boring and setting device for boring and setting anchors in the longitudinal center plane of a tunneling or 5 mining machine in the roof, wherein the tunneling or mining machine comprises at least one support near the mine face, which is braceable between the roof and the floor and is articulated to the front end of the machine and hinged to the rear part of the machine by connecting rods extending in the 10 longitudinal direction of the machine, characterized in that the anchor boring and setting device in a manner pivotable about an axis extending transverse to the longitudinal direction of the machine and fixable in the pivoted position is connected with at least one connecting rod extending in the 15 longitudinal direction of the machine.

2. An anchor boring and setting device according to claim 1, characterized in that the connecting rod extending in the longitudinal direction of the machine comprises two 20 substantially parallel arms and that the anchor boring and setting device is pivotably mounted on a carrier connecting said arms.

3. An anchor boring and setting device according to claim 2, 25 characterized in that the carrier is connected with the arms via joints.

4. An anchor boring and setting device according to claim 2 or 3, characterized in that the arms on their inner sides facing 30 each other carry pins or bearing eyes extending parallel with the arms and that the carrier comprises bearing eyes encompassing said pins or pins projecting into said bearing eyes. 35

5. An anchor boring and setting device according to claim 4, characterized in that at least one bearing eye is designed as - 10 a longhole the longer axis of which extends in the direction of, or parallel to, the plane stretched by the arms.

6. An anchor boring and setting device according to any one of 5 claims 1 to 5, characterized in that the anchor boring and setting devices are arranged on slides displaceable relative to each other in a telescopic manner, one of which is pivotable about the axis extending transverse to the carriers and is connected with a pivoting actuator so as to be fixable 10 in its pivoted position.

7. An anchor boring and setting device according to any one of claims 1 to 6, characterized in that the pivot axis of the anchor boring and setting device, which extends transverse to 15 the longitudinal axis of the machine, is arranged on a site facing away from the mine face and located behind the horizontal pivot axis of an cantilever arm for the cutting tools, in particular cutter rolls.