EP2415881A1 - Holding device for a drill rod of a tap hole drilling machine and method for removing a drill rod - Google Patents

Abstract

Holding device (27) comprises a gripping device, which is arranged on a mounting. A tap hole drilling machine (10) exhibits a mounting (11) having a movably arranged drill- and hammer mechanism (16). The drill- and hammer mechanism comprises a drill rod receptacle (17) for connecting the drill rod. The gripping device acts relative to drill rod receptacle for holding the drill rod. The drill rod is firmly fixed on the mounting by the gripping device. An independent claim is also included for removing the drill rod from drill rod receptacle of tap hole drilling machine, comprising moving the drill rod receptacle to the gripping device such that the drill rod is removed from the drill rod receptacle.

Description

The invention relates to a holding device for a boring bar of a taphole drilling machine with the features of claim 1 and to a method for removing a boring bar from a boring bar receptacle of a taphole drilling machine having the features of claim 15.

Tap hole drilling machines are well known from the prior art and essentially serve to open a melt channel by drilling a blast furnace wall of a blast furnace. The known tap hole drilling machines are essentially formed of a frame with a drilling and striking mechanism arranged thereon. The drills and drums have a boring bar adapter for connecting a drill pipe several meters long. The frame is designed in the manner of a carriage and, for example, rotatably and pivotably mounted so that it can be moved in front of a taphole of a blast furnace in a provided for a hole position. To attach a hole, the frame is also regularly with a front end a fastening device firmly fixed to the blast furnace. Thus, a relatively large feed force can be applied during a drilling process via the boring bar. During the drilling process, the drilling and percussion mechanism causes a rotation of the drill rod together with a recurring impact pulse in the manner of a hammer drill. An advance of the drill rod is carried out by a feed movement of the drilling and hammer mechanism in the longitudinal direction of the frame, so that the drill rod can penetrate deeper and deeper into the wall of the blast furnace. Since a boring bar can be several meters long, it is necessary to loosely support the boring bar at the front end of the rack. For this purpose, various devices are known from the prior art, which are designed so that the drill rod can be easily changed, as well as learns a guide that ensures unobstructed rotation and feed the drill rod in any case.

Since the drilling and percussion mechanism exerts relatively large forces over the boring bar receptacle on the boring bar during a drilling operation, a plastic deformation of a rear end of the boring bar in the boring bar receptacle can regularly occur during the boring process. The plastic deformation can be effected in particular by the impact mechanism, which exerts a shock pulse on the rear end of the drill rod via the Bohrstangenaufnahme. This can lead to the usually necessary replacement of the drill rod is difficult after opening a needle hole. The plastic deformation of the rear end of the drill rod in the Bohrstangenaufnahme the drill rod can jam so in the Bohrstangenaufnahme that they can not easily be removed easily from the Bohrstangenaufnahme. Thus, in this case, a change of the drill rod or its removal from the boring bar receptacle by operating personnel only with additional tools under an increased amount of time is possible.

The present invention is therefore based on the object of proposing a holding device for a boring bar of a taphole drilling machine and a method for removing a boring bar from a boring bar receptacle of a taphole drilling machine, which enables a simple removal of a boring bar from a boring bar receptacle.

This object is achieved by a holding device having the features of claim 1 and a method having the features of claim 15.

The invention relates to a holding device for a boring bar of a taphole drilling machine, wherein the taphole drilling machine has a frame with a movably arranged drilling and striking mechanism, wherein the drilling and striking mechanism has a boring bar receptacle for connecting the boring bar, wherein a gripping device of the holding device is arranged on the frame is, wherein the gripping device for supporting the boring bar relative to the Bohrstangenaufnahme is used, and wherein by means of the gripping device, the boring bar is fixed to the frame.

Accordingly, it is possible by means of the gripping device to fix the boring bar relative to the frame at this rotationally fixed or fix so that a feed movement of the boring bar is no longer possible. As a result, it becomes possible to move the drill and percussion mechanism movable in the frame in a direction opposite to the advancing movement or to drive it in such a way that the boring bar is pulled out of the boring bar receptacle. In the event that the drill rod should have jammed in the Bohrstangenaufnahme, thus no additional tool or personnel is required because a tool for holding or clamping the boring bar provided by the gripping device, or is formed. Compared to a manual removal of the drill rod from the Bohrstangenaufnahme can also by means of the movable drills and percussion Particularly high tensile forces are provided or made available, which simplify extraction even highly deformed Bohrstangenenden from the Bohrstangenaufnahme, without a time required for a drill rod change is substantially increased.

With regard to the fixation of the drill rod relative to the frame, it is basically irrelevant at which point of the frame, the drill rod is fixed. For example, it is also conceivable to fix the boring bar in the immediate vicinity of the boring bar receptacle on the frame.

It is particularly advantageous if the gripping device is arranged on an end of the frame which faces a stitch hole and is opposite the drilling and impact mechanism. The gripping device can then be designed so that it also serves to guide the drill rod. Thus, a possibly eccentric or eccentric running of the boring bar when drilling a blast furnace wall can be avoided.

The gripping device may, for example, comprise clamping elements which can positively and / or positively fix the boring bar. Thus, the clamping elements can be designed so that they clamp the drill rod by means of frictional engagement. A provided for engagement with the drill rod surface of the clamping elements may be provided for example with a toothing. The clamping elements may also have pointed or wedge-shaped projections which can penetrate positively into a surface of the drill rod.

Further, it is advantageous if the gripping device has claws which can embrace the boring bar, such that the boring bar is guided by the claws. The Klausen can serve as a guide for the boring bar, without any fixation of the boring bar by means of the claws. The claws can also be such that, in addition to enclosing the boring bar, they are pivotable so that the boring bar is released by the clutches and is easily replaceable.

In this respect, it is advantageous if the clamping elements are respectively arranged on the jaws and firmly connected thereto. Depending on the position of the jaws relative to the drill rod, the clamping elements can firmly abut against this and thus fix the boring bar, or be spaced from the boring bar, so that the boring bar is guided between the claws. The function of the clamping elements can be adjusted so easily over a distance of the jaws relative to the drill rod.

Furthermore, the holding device can have a drive unit which can bring about pivoting of the gripping device into an opening, closing or clamping position. In an open position, for example, claws can be spaced apart from one another such that no guidance of the drill rod between the claws takes place and the boring bar can be easily removed. In a closed position, the jaws may surround the drill rod to such an extent that the drill rod is passed between the jaws, and in a clamping position, the jaws may approximate the drill rod so that the drill rod is fixed between the jaws or between jaws fastened to the jaws. The drive unit can enable a simple, automated and possibly automated transfer of the gripping device into these positions.

The drive unit may be formed of a lever gear, a drive shaft and an actuating cylinder, wherein the actuating cylinder is coupled to the drive shaft such that the drive shaft is rotatable by means of the confirmation cylinder, and wherein the drive shaft is so coupled to the lever gear, the lever mechanism by means of Drive shaft can cause the pivoting of the gripping device. The actuating cylinder may be a hydraulic cylinder which rotates or pivots the drive shaft at a certain angle of rotation. This rotation of the drive shaft can be further transmitted to the lever gear, so that the lever mechanism causes an actuation of the gripping device. So can the opening, closing, or Clamping position can be adjusted by different rotational angle positions of the drive shaft. Also, the use of a drive shaft allows a spatial separation of gripping device and actuating cylinder, since the actuating cylinder should be protected from the influence of temperature and removed as far as possible from the blast furnace wall.

In order to adapt the gripping device to different boring bar diameters or also to change between the closing or clamping position of the gripping device, the holding device can have an adjusting device by means of which the closing or clamping position can be adjusted.

Thus, a stop for limiting a rotation of the drive shaft can be formed between the drive unit and the adjusting device. The drive shaft is then rotatable by means of the actuating cylinder only up to a certain angle of rotation until the closing or the clamping position of the gripping device is reached. The stop may for example also include a screw that allows fine adjustment of the stop.

A rotation of the drive shaft is easily possible if the actuating cylinder is connected via a crank lever to the drive shaft. The crank lever may, for example, be rigidly secured to one end of the drive shaft, wherein the actuating cylinder can engage one end of the crank lever and pivot it about the drive shaft.

In this case, the stop can be particularly easily formed between the crank lever and the adjusting device. The stop can then easily limit a pivoting movement of the crank lever and thus a rotational angle of the drive shaft.

To vary the stop as simple as possible or adjust, the adjustment can have a stop element for forming the stop, wherein the stop element may have a closing stop for forming the closed position and a clamping stop to form the clamping position, wherein the stop element between a closing or Clamping position is movable, such that the closing stop or optionally the clamping stop forms the stop. The stop element can therefore form two stops, which, depending on the desired position of the gripping device, the respectively suitable stop of the stop element is used. The stop element can be formed, for example, as a rod which forms the closing stop and the clamping stop and can be moved along its longitudinal axis so that the closing stop or the clamping stop is used as a stop. The thus formed stop can then limit a rotational angle of the drive shaft, or set and allows a selection between the closing or clamping position of the gripping device by a simple displacement of the stop element. Also, the closing or clamping stop can be formed by dispensing with a physical formation of one of these stops on the setting device. The relevant stop can then be formed by the maximum stroke of the actuating cylinder.

In a further embodiment, the adjusting device may comprise a spring, by means of which the stop element is movable into the closed position. This can be ensured that, if no specific position was selected by means of the adjustment, always the closing stop forms the stop and the gripping device is in the closed position. The spring may be formed as a tension or compression spring, which causes a displacement or related movement of the adjusting device.

Thus, it is advantageous if the adjusting device has a locking unit, by means of which the stop element can be locked in the closed or clamping position. By means of the locking unit it can be ensured that the stop element remains securely in its intended position. The locking unit may for example be formed from a lever element which is locked or pivoted in a respective desired position of the stop member so that the locking unit fixes the stopper member positively and prevents the same unwanted displacement.

In the method according to the invention for removing a boring bar from a boring bar receptacle of a taphole drilling machine, the taphole boring machine has a frame with a drilling and hammer mechanism arranged thereon, the boring and striking mechanism having the boring bar receptacle for connecting the boring bar, wherein a gripping device is arranged on the frame wherein the gripping device supports the drill rod relative to the drill rod receiver, wherein the drill rod is fixedly secured to the frame by means of the gripper, and wherein the drill rod receiver is moved relative to the gripper so as to remove the drill rod from the drill rod receiver.

With regard to the advantages of the method according to the invention, reference is made to the above description of the device according to the invention. Other advantageous embodiments of the method will become apparent from the feature descriptions of the dependent claims back to the device claim 1.

In the following the invention will be explained in more detail with reference to the accompanying drawings.

Fig. 1

eine Seitenansicht einer Stichlochbohrmaschine mit einer Haltevorrichtung;

Fign. 2a-2c

eine Vorderansicht einer Greifeinrichtung in verschiedenen Positionen;

Fign. 3a-3c

ein jeweils vergrößerter Ausschnitt der Greifeinrichtung aus den Fig. 2a bis 2c ;

Fig. 4

eine Schnittansicht der Stichlochbohrmaschine mit einer Einstelleinrichtung;

Fig. 5

eine Teilansicht der Stichlochbohrmaschine aus Fig. 1 mit der Einstelleinrichtung;

Fig. 6

eine Längsschnittansicht der Einstelleinrichtung aus Fig. 5 ;

Fig. 7

eine weitere Längsschnittansicht der Einstelleinrichtung aus Fig. 5 ;

Fig. 8

eine vergrößerte Seitenansicht der Einstelleinrichtung aus Fig. 5 ;

Fig. 9

eine Seitenansicht einer weiteren Ausführungsform einer Einstelleinrichtung.

Show it:

Fig. 1

a side view of a tap hole drilling machine with a holding device;

FIGS. 2a-2c

a front view of a gripping device in different positions;

FIGS. 3a-3c

an enlarged detail of the gripping device from the Fig. 2a to 2c ;

Fig. 4

a sectional view of the taphole drill with an adjustment;

Fig. 5

a partial view of the tap hole drilling machine Fig. 1 with the adjustment device;

Fig. 6

a longitudinal sectional view of the adjustment of Fig. 5 ;

Fig. 7

a further longitudinal sectional view of the adjustment of Fig. 5 ;

Fig. 8

an enlarged side view of the adjustment from Fig. 5 ;

Fig. 9

a side view of another embodiment of an adjustment.

Fig. 1 The tap hole drilling machine 10 has a base 12 and a positioning device 13 for moving and positioning a frame 14 arranged thereon with a boring bar 15 and a boring and percussion mechanism 16. The boring bar 15 is inserted into a boring bar receptacle 17 of the boring and striking mechanism 16 and can be pushed forwards or backwards by a longitudinal movement of the boring and striking mechanism along the frame 14 in the direction of the blast furnace wall 11. Next is at one front end 18 of the frame 14, a fastening device 19 is arranged, which fixes the frame 14 fixed to a holder 20 on the blast furnace wall 11. In particular, a precise tap hole can be performed. At the front end 18, a gripping device 21 is also arranged with a lever mechanism 22, wherein the lever mechanism 22 is connected via a drive shaft 23 with a not visible here actuating cylinder under a protective cover 24. Further, an adjusting device 25 is arranged at a rear end 26 of the drive shaft 23. The adjusting device 25 forms, together with the gripping device 21 and the lever mechanism 22, the drive shaft 23 and the actuating cylinder, a holding device 27 for the boring bar 15. In the event that the boring bar 15 can not readily be removed from the boring bar receptacle 17, especially if it is jammed by plastic deformation in the boring bar receptacle 17, the boring bar 15 is clamped by means of the gripping device 21 to a front end 28 of the boring bar 15 and so firmly fixed relative to the frame 14. The drilling and impact mechanism 16 is now moved or pushed back in the direction of a rear end 29 of the frame 14, so that the drill rod 15 is pulled out of the boring bar receptacle 17 by this relative movement. Thus, an already necessary mechanical movement of the drilling and percussion mechanism 16 in the direction of the rear end 29 of the frame 14 for pulling out the boring bar 15 from a borehole, not shown here in the blast furnace wall 11 can be used to release the boring bar 15 from the boring bar receptacle 17 , Also, it is then necessary neither additional tool nor an interruption of the usual workflow.

The Fig. 2a to 2c respectively. Fig. 3a to 3c show several views of the gripping device 21, which is essentially formed from claws 30 and clamping elements 31. The claws 30 are arranged relative to an axis of symmetry 32 of the gripping device 21 about axes 33 pivotally. The lever mechanism 23, not shown in this view is about Joints 34 connected to the claws 30. The drill rod 15 is received in the positions shown here in each case of the gripping device 21 between the jaws 30 so that they can not fall out. For complete replacement of the drill rod 15, the claws 30 can each be pivoted about the axes 33 so that the drill rod 15 is released. The Fig. 2a or 3a show a clamping position of the gripping device 21, the Fig. 2b or 3b a middle position and the Fig. 2c or 3c, a closed position of the gripping device 21. A claw distance a is accordingly reduced or increased respectively. Like from the Fig . 3a can be seen, wedge-shaped clamping jaws 35 of the clamping element 31 penetrate into a surface 36 of the boring bar 15, so that a positive and positive fixing of the boring bar 15 by means of the gripping device 21 is achieved. According to the presentation of the Fig. 3c For example, the claws 30 may be moved slightly apart so that the jaw spacing a is increased and a gap 37 is formed between the jaws 35 and the boring bar 15. The drill rod 15 can then rotate in the gripping device 21 for a drilling operation and be advanced in the axial direction. The gripping device 21 fulfills a guiding function in this position. If the two clamping elements 31 are worn, they can be easily disassembled and replaced by means of screws 38 from the claws 30.

A synopsis of Fig. 4 to 8 shows a closer view of the adjustment 25. The under the protective cover 24 located actuating cylinder 39 is connected via a hinge 40 with a crank lever 41, which in turn is fixedly connected to the drive shaft 23. A movement of the actuating cylinder 39 thus enables a rotation of the drive shaft 23 by a rotation angle α, as from Fig. 4 seen. On the crank lever 41, an adjusting screw 42 is further attached, here together with a stop element 43 of the adjusting device 25, a stop or closing stop 47 is formed. The stop member 43 is formed as a rod 45 with a square cross-section and in a matching trained guide profile 46 mounted longitudinally movable. On the rod 45 opposite the adjusting screw 42, the closing stop 47 is designed to bear the adjusting screw 42 or a clamping stop not visible here. Further, a spring 49 is fixed to a front end 50 of the rod 45 so that the rod 45 in the in the 6 and 7 shown closed position of the stop element 43 is pulled. At a rear end 51 of the rod 45, a lever 52 is further arranged on an axis 53 on the rod 45, and rotatably connected thereto. Thus, the axis 53 is inserted into a central bore 54 in the rod 45 and secured by means of an eyelet screw 55. The eyelet screw 55 also serves to fasten the spring 49. By a movement of the lever in the here in the 6 and 7 shown with dashed lines clamping position of the stop member 43, the rod 45 is displaced against a spring force of the spring 49 in the direction of the rear end 51 so in the guide section 46 that the clamp stop is formed. The adjustment device 45 further has an operator panel 56, which can take an operator from the respective position of the lever 52 or the closed or clamping position of the gripping device 21. The lever 52 can continue to be pivoted about a Längsache 57 of the rod 45, that the lever 52 can lock the rod 45 in the respective position or position.

The Fig. 9 shows a further embodiment of an adjustment 58, which has a lever 59 with a control panel 60, in contrast to the adjustment device described above. In the operation panel 60, two grooves 61 are formed, and the lever 59 can be respectively inserted by pivoting about the longitudinal axis 57 in the grooves 61, so that a respective position of the rod 45 by means of the lever 59 and the control panel 60 can be positively fixed.

Claims (15)

Holding device (27) for a boring bar (15) of a taphole drilling machine (10), wherein the taphole drilling machine has a frame (11) with a movably arranged drilling and striking mechanism (16), wherein the drilling and percussion a Bohrstangenaufnahme (17) for Connecting the boring bar, wherein a gripping device (21) of the holding device is arranged on the frame, wherein the gripping device for supporting the boring bar relative to the Bohrstangenaufnahme serves, and wherein the boring bar is fixed by means of the gripping device to the frame. Holding device according to claim 1,
characterized,
in that the gripping device (21) is arranged on an end (18) of the frame (14) which faces a stitch hole and lies opposite the drilling and impact mechanism (16). Holding device according to claim 1 or 2,
characterized,
that the gripping means (21) clamping elements (31) which can use the drill rod (15) positively and / or fix a form fit. Holding device according to claim 3,
characterized,
in that the gripping device (21) has claws (30) which can engage around the drill rod (15) such that the drill rod is guided by the claws. Holding device according to claim 4,
characterized,
in that the clamping elements (31) are respectively arranged on the claws (30) and firmly connected thereto. Holding device according to one of the preceding claims,
characterized,
in that the holding device (27) has a drive unit which can bring about pivoting of the gripping device (21) into an opening, closing or clamping position. Holding device according to claim 6,
characterized,
is formed in that the drive unit consists of a lever mechanism (22), a drive shaft (23) and an actuating cylinder (39), wherein the actuating cylinder is such coupled to the drive shaft so that the drive shaft is rotatable by means of the actuating cylinder, and wherein the drive shaft in such a way with the Lever gear is coupled, that the lever mechanism by means of the drive shaft can cause the pivoting of the gripping device (21). Holding device according to claim 6 or 7,
characterized,
in that the holding device (27) has an adjusting device (25, 58) by means of which the closing or clamping position of the gripping device (21) can be adjusted. Holding device according to claim 8,
characterized,
in that a stop (47) for limiting a rotation of the drive shaft (23) is formed between the drive unit and the adjusting device (25, 58). Holding device according to claim 8 or 9,
characterized,
in that the actuating cylinder (39) is connected to the drive shaft (23) via a crank lever (41). Holding device according to claim 10,
characterized,
that the stop (47) between the crank lever (41) and the adjusting means (25, 58) is formed. Holding device according to one of claims 9 to 11,
characterized,
in that the setting device (25, 58) has a stop element (43) for forming the stop, wherein the stop element has a closing stop (47) for forming the closed position and a clamping stop for forming the clamping position, the stop element being movable between a closing or clamping position is, such that the closing stop or optionally the clamping stop forms the stop. Holding device according to claim 12,
characterized,
in that the adjusting device (25, 58) has a spring (49) by means of which the stop element (43) can be moved into the closed position. Holding device according to claim 12 or 13,
characterized,
in that the adjusting device (25, 58) has a locking unit, by means of which the stop element (43) can be locked in the closed or clamping position. A method of removing a boring bar (15) from a boring bar receptacle (17) of a taphole boring machine (10), the taphole boring machine comprising a frame (14) having a boring and striking mechanism (16) mounted thereon, the boring and striking mechanism receiving the boring bar receptacle Connecting the boring bar, wherein a gripping device (21) is arranged on the frame, wherein the gripping device holds the boring bar relative to the Bohrstangenaufnahme, wherein by means of the gripping device, the boring bar is fixedly fixed to the frame, and wherein the Bohrstangenaufnahme is moved relative to the gripping device so in that the boring bar is removed from the boring bar receptacle.

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