LU83336A1 - DEVICE FOR CENTERING AND GUIDING A DRILLING ROD OF THE CASTING HOLE OF A TANK OVEN AND DRILLER PROVIDED WITH SUCH A DEVICE - Google Patents

Description

I 1? 1 J Device for centering and guiding a drill rod for the tap hole of a shaft furnace and drill! The present invention relates to a device for centering and guiding a drill rod for the tap hole of a shaft furnace suitable for a method according to which the opening and closing of the tap hole comprise respectively an extraction operation and an operation 10 for replacing the drilling rod mistletoe is abandoned 1 in the taphole between two successive castings, and 41 designed to be mounted on the front end of the mount! "of a taphole drilling machine equipped with a device for gripping the end of the drilling rod 15 which can slide along the mounting of the machine. | vention also relates to a hole drilling machine

Ide casting equipped with such a centering and guiding device.

This relatively recent method of opening the taphole by means of a drilling rod which is abandoned in the taphole between two successive taps is attracting increasing interest at the expense of conventional methods of drilling the tapholes. by means of a drill bit. For more details concerning this process and its advantages, as well as for the necessary equipment,! i reference may be made to Luxembourg patent No 82.943.

This patent also explains the problems associated with the use, for the implementation of this new process, of machines designed for the conventional drilling processes. 30 sic or for the design of machines suitable for the implementation of both methods, that is to say of the conventional method | or the drilling process mentioned in the preamble.

"These problems result from the need for alignment between the piercing rod and the gripping device thereof, as well as from the need to" thread "the piercing rods through a guide device and support during the approach movement from the carriage to the g.j operating position.

1 However, there are two factors to take into consideration! _; SL_ - 2 - tion and which generally mean that these conditions are not met. Indeed, it may happen that the piercing rod after being replaced in the tap hole, in the plugging mass not yet hardened, bends or bends slightly under the influence of heat and its weight! so that its end, which must be gripped by the gripping device of the drilling machine, is slightly offset from the axis of the tap hole and the axis | of this gripping device.

c 10 Another factor to take into account is \ i: that of the type of machines used and more particularly I of the approach path to the lookout. In fact, for the device or the guide and support head located at the front of the mount to be able to be threaded onto the end of the piercing rod, the final phase must be | of the approach movement of the lookout is changing significantly in | the axis of the drill rod. However, this condition is rarely fulfilled for a machine designed for a conventional drilling process. In fact, many of these machines are designed to bring the carriage into the working position by means of a double movement, the last phase of which is necessary! j final and exact positioning in alignment with the taphole is always a substantially vertical movement parallel to the wall of the furnace. It is obvious that such a movement t 25 does not allow the engagement of the guide head at the front | of the lookout in the protruding end of the drill rod | when the latter is firmly anchored in the hardened mass i of the tap hole. To allow this engagement of conventional drills in the drilling rod, it has hitherto been necessary, for each operation, to dismantle this plate, bring the mounting of the drill to the desired position and then reassemble the plate after to have engaged it on the rod of per-; cage. This operation is not only a waste of time, but in addition, given the location, exposes the worker who performs it, to the risk of serious accidents.

I The same problem exists for machines which j - bring the carriage into the operative position by a trajectory | composed of a final approach movement and a final descent movement. Even for machines whose trajectory * * i \ -3 - i cover of the carriage does not, in the final phase, have i jj component perpendicular to the axis of the drilling rod,) this problem exists, because in these machines, the carriage generally pivots around a vertical or slightly inclined axis 5 so that the end of the carriage tangentially approaches the axis of the drilling rod in the final phase of the movement , or returns to this axis after cutting it before.

One of the only machines capable of moving the front end of the carriage substantially in the axis of the tap hole during the final approach phase is proposed. by French patent application No 78 27 850. For this machine, the problems discussed above have been resolved thanks to the aforementioned Luxembourg patent which proposes a head 115 for guide and support fixed to the front of the carriage to be threaded on the piercing rod and ensure alignment between it and the gripping device. According to this patent, this guide head has a funnel-shaped opening for gripping the end of the piercing rod and compensating for the slight offset that may still exist, either as a result of the trajectory of the carriage, or as a result incorrect orientation of the drill rod. However, the subject of this patent did not resolve

Problems for other machines.

The object of the present invention is to solve these problems for all types of machines by means of a simple and effective centering and guiding device designed to be fixed on the front part of the carriage of a machine. drilling.

To achieve this objective, the device pro posed by the invention is essentially characterized by a pair of pivoting jaws, of complementary shapes, and whose axes of rotation are parallel, and by a mechanism for pivoting the two jaws, in synchro -35 nism, between an open position in which the space between the two axes of rotation is free and a closed position in which the jaws are folded one on, j the other and occupy the space between their axes of rotation , with the exception of a passage for the drill rod.

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According to an advantageous embodiment, the inner side of each of the jaws is designed in the form of an inclined ramp. The ramp of one of the jaws is located in the upper part of the latter and is oriented to act up and down on the piercing rod, while the ramp of the other jaw is symmetrically in the lower half of it and is oriented to act from bottom to top on the piercing rod.

The width of the jaws on the side provided with the inclined ramp is greater than half the spacing j 5 of their axes of rotation, so that these jaws are! | partially overlap in the closed position.

! - According to a first embodiment, the jaws - | res are designed to rotate in opposite directions. To avoid | 15 that the jaws collide in this embodiment, j at least one of the jaws is bent or curved, i According to a second embodiment, both! jaws are designed to rotate in the same direction and are oriented in opposite directions in the open position, in this case the jaws may be flat.

The invention also relates to a machine for! drilling a tap hole in a shaft furnace comprising a working tool mounted on a carriage and capable of sliding the * 1! along it and provided with a gripping device | 25 of a piercing rod, characterized by a device i | centering and guiding of the kind described above, fixed to | the front end of the carriage, such that the axes of rotation j of the two jaws are arranged symmetrically apart

Iet of the extension of the axis of the pre-tensioning device of the piercing rod.

* Other special features and characteristics || Will emerge from the detailed description of two advantageous embodiments, presented below by way of illustration, with reference to the appended figures in which: djj Figure 1 schematically shows a side view of a line particular type of drilling machine during 1 Phase of approach from the carriage to the operative position? ï j »· * Figure 2 shows a view of the same machine /. - 5 - in the operative position during the extraction operation of the drilling rod?

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j Figure 3 shows a schematic plan view

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J of a first embodiment in the open position; j.

Figure 4 shows a section along the section plane IV-IV in Figure 3;

Figures 5 and 6 show views corresponding respectively to those of Figures 3 and 4 when the jaws are in an intermediate position; Figures 7 and 8 show corresponding views when the jaws are in the fully closed position;

Figure 9 schematically shows a plan view of a second embodiment when the jaws; 15 are in the open position; FIG. 10 shows a view of a section along the section plane X-X of FIG. 9 and | Figures 11 and 12 show views corresponding to those of Figures 9 and 10 when the jaws i 20 are in the fully closed position, jj In Figures 1 and 2, the reference 20 denotes d the base of the wall of a blast furnace. The reference i 22 represents the tap hole obstructed by a plugging mass 24, such as hardened clay, through f; 25 which was introduced, before hardening, a piercing rod 26. This piercing rod 26 is left in the position shown in FIG. 1 until the next tap hole opening operation, which operation consists in removing this piercing rod 30 to release the opening of the tap hole 22. To facilitate gripping of this rod 26, the latter is provided at its end with a circular groove 28 or other suitable means.

| To extract the piercing rod 26, a working tool equipped with a percussion member capable of striking in both directions is used. In the figures, there is shown by the reference 30 the lookout! / a: y - 6 - of a machine for drilling the tap hole with a working tool 32 sliding along the mount 30 and equipped with such a percussion member. Since this working tool 32 is designed to travel along the carriage 5, it can be used to extract the piercing rod 26, provided that an appropriate gripping device is represented there, represented schematically by the reference 34.

To be able to grasp the circular groove 28 10 by the gripping member 34, the mounting 30 i must be brought into an operative position in which the gripping member 34 is located substantially in the axis of the piercing rod. 26 in order to be able to be engaged therein by sliding along the carriage 30.

The carriage 30 shown in FIGS. 1 and 2 is that of a type of machine in which the final phase of this approach movement towards the operative position comprises a descent component and an approach component towards the furnace. In Figure 1 20 there is shown the carriage 30 in a position preceding the operative position, that is to say that the carriage must still descend and approach the oven for the axis! of the gripping device 34 is aligned with the axis of the piercing rod 26.

25 However, this downward movement no longer allows penetration into the drilling rod of a support and guide plate fixed to the front end of the mount if this plate is not designed as a a device as proposed by the invention and described in detail below. This centering and guiding device proposed by the invention is shown diagrammatically by the reference 36 in FIGS. 1 and 2 must in fact ensure the alignment of the axis of the piercing rod 26 with that of the gripping device. 34 and vice versa even, if the movement of approach by the carriage 30 does not allow this exact alignment or that the piercing rod 26, in particular its £ - /; -Τ Ι ϋ j end, no longer occupy the axial position of the tap hole, as shown schematically by the curved axis 26 'of the piercing rod.

When the carriage 30 is in the operative position and the centering and guiding device 36 has been correctly engaged on the drilling rod 26, the working tool 32 can be advanced until the device grip 34 grab the rod! drilling 26 through the circular groove 28. From this moment, the working tool 32 can be actuated; to move back along the carriage 30 and extract the piercing rod 26 from the tap hole 22. During this extraction, especially during the final phase when the piercing rod 26 no longer has support in the 15 casting 22 it is supported by the device 36, if as shown in FIG. 2.

h A first embodiment of a device 36 for centering and guiding will be described with reference to FIGS. 4 to 8. This device is essentially constituted by two pivoting jaws 38 and 40 whose axes of rotation 42 and 44 are mounted at the front end of the mount perpendicularly by! relative to the longitudinal axis thereof and symmetrically on either side of the extension of the axis of the gripping device 34 not shown in FIGS. 4 to 8. The two axes of rotation 42 and 44 are connected respectively by sets of articulated levers 50, 52 to a rod 48 of a jack 46 or of an electromechanical motor fixed on the carriage 30. The sliding of this rod 30 48 under the action of jack 46 consequently causes the rotation of the axes 42 and 44 and the pivoting of the jaws 38 and 40 between an open position according to FIG. 3 and a closed position according to FIG. 7.

As shown in Figures 4, 6 and 8, the inner side of each of the jaws 38 and 40 I is designed as an inclined ramp 38a respectively; clothing 40a. The inclined ramp of one of the jaws, for example, the ramp 38a of the jaw 38, extends; from the middle region towards the upper part in order to exert on the rod 26 a push from top to bottom | when it meets it during closing.

5 Likewise, the ramp 40a extends symmetrically with respect to the ramp 38a from the middle region of the jaw 40 towards the lower part so as to exert a force from bottom to top on the rod during its meeting t during closing. jaws.

10 As a result of the symmetrical arrangement of these | v jaws 38 and 40 and the presence of inclined ramps 38a, 40a, these jaws delimit, during their | movement, a diamond-shaped opening section i evolving increasing or decreasing symmetrically j · 15 around the central axis which, by the arrangement of the axes; of rotation corresponds to the extension of the axis i; of the gripping device 34.

During the approach movement of the carriage, the jaws are in the open position according to. 20 Figures 3 and 4 as shown schematically in Figure 1. The hatched area in broken lines shown 1 by 54 in Figure 4 shows the maximum section 'swept by the jaws during their closing ji movement. This amounts to saying that, during the approach i, 25 of the lookout, it suffices that the piercing rod 26 is located inside this interception area 54 without! that it must be located in the central axis J as shown in FIG. 4. In fact, when the jack 46 is actuated to close the jaws 38 and 40, the area 54 is progressively reduced by passing through an intermediate diamond shape 54 '; (FIG. 6) to be reduced to the minimum surface 54 ", also in the form of a diamond around the central axis i (FIG. 8). The final position of the rod 26 will therefore necessarily be a central position relative to the jaws and vice versa, even if this position was not central at the start of the jaw closure according to! Λ ΐ '—η ---- y ί k: - 9 - i «j

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| Figures 3 and 4. These jaws 38 and 40 provide! consequently that the piercing rod 26 is, after their closure according to FIGS. 7 and 8, in alignment with the gripping device 34.

5 When the closure of the jaws 38 and 40 occurs in a plane passing through the axes of rotation 42 and 44 as shown in FIG. 7, at least one of the jaws must be curved or bent, like the jaw 38 Indeed, since the | 10 jaws gradually overlap with their | ramps 38a and 40a during closing, they would collide with each other in an intermediate position, as for example in the position of FIG. 5, if

The two jaws were flat. It is however possible to avoid this problem by means other than that given to the jaw 38.

The second embodiment shown on

Figures 9 to 12 differ from the embodiment described above essentially in that the two jaws 58 and 60 are oriented in opposite directions, in the open position shown in Figures 9 and 10. In this embodiment, the rod 48 | of cylinder 46 (Figure 1) is connected to one of the axes of! rotation, in this case the axis 62, by a set of articulated levers 68. The other axis of rotation 64 of the jaw 60 is actuated from the axis 62 by means of a linkage 66. Then in the first embodiment, the jaws turned in the opposite direction, in this second embodiment the jaws 58 and 60 30 rotate in the same direction under the action of the jack 46.

For the rest, the shape of the jaws 56, 60, as well as their operation, are similar to those !! of the previous embodiment, that is to say that, when they are closed, passing from the position according to FIGS. 9 and 10 to that of FIGS. 11 and 12, the j, jaws 58 and 60 bring back the rod of drilling 26 towards' J a central position if it was not at the start.

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- 10 - p In this second embodiment, there is no 8 · | danger that the jaws 58 and 60 collide during their movements and, therefore, they can both be flat.

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Claims (11)

1. Device for centering and guiding a piercing rod (26) of the tap hole (22) of a shaft furnace suitable for a method according to which the opening and closing of the tap hole (22) comprise respectively an extraction operation and a reinstallation operation of the piercing rod (26) which is abandoned in the taphole (22) between two successive castings, and designed to be mounted on the front end of the carriage (30) of a machine for drilling the tap hole equipped with a gripping device (34) of the end (28) of the drilling rod (26), which can slide along of the carriage (30) of the machine, characterized by a pair of pivoting jaws (38, 40) (58.60), i <j of complementary shape, and whose axes of! J l | rotation (42, 44) (62, 64) are parallel, and by one; | mechanism for pivoting the two jaws (38, 40) i 20 (62, 64), in synchronism, between an open position! in which the space (54) between the two axes of rotation j (42,44) (62,64) is free and a closed position in! ' which jaws (38, 40) (58, 60) are folded ^ one on the other and occupy the space between their axes; 25 rotation (42, 44) (62, 64), except for one! ♦ j passage (54 ") for the drilling rod. 2. Device according to claim 1, characterized in that the inner side of each of; jaws (38, 40) (58, 60) is designed in the form of 3. inclined ramps (38a, 40a), the ramp (38a) of one of! - jaws (38) located in the upper part thereof and is oriented to act from top to bottom on the piercing rod (26), while the ramp (40a) of the other jaw (40) lies symmetrically in the lower half thereof and is oriented for; I act from bottom to top on the piercing rod (26). / ~~ t / f - 12 - h ji ‘3. Device according to one of claims j j 1 or 2, characterized in that the width of the jaws | (33.40) (58.60) on the side provided with the inclined ramp (38a, 40a) is greater than half the spacing 5 between their axes of rotation (42, 44) (62, 64), so that these jaws (38, 40) (58, 60) partially overlap in the closed position. 4. Device according to any one of claims 1 to 3, characterized in that the mechanism 10 for pivoting the jaws (38, 40) (58, 60) consists of a hydraulic or pneumatic cylinder (46) mounted on the 'carriage (30), or an electromechanical motor. he 5. Device according to any one of claims 1 to 4, characterized in that the jaws Il 15 (38, 40) are designed to rotate in opposite directions. 4 "J Ît l Claims 6. Device according to claim 5, characterized in that the axes (42, 44) are respectively connected by a set of articulated levers (50, 52) to the | cylinder rod (48) (46). 7. Device according to claim 5, characterized in that at least one of the jaws (38) is bent or curved. 8. Device according to any one of claims 5 to 4, characterized in that the two 1, 25 jaws (58, 60) are designed to rotate in the same direction and are oriented in opposite directions in the open position ( figure 9). 9. Device according to claim 8, characterized in that the jaws (58, 60) are flat. There 30 10. Device according to claim 8, i ‘characterized in that the cylinder (46) is connected by its; piston rod (48) and a set of articulated levers (68) I "to one of the axes of rotation (62), the latter being j | connected by a linkage (66) to the second axis of rotation (64). 11. Tap hole drilling machine !! / dd fi of a shaft furnace comprising a working tool (32) j] mounted on a carriage (30) and capable of sliding along! ! s * -.-- j; 7 - 13 - thereof and provided with a gripping device (34) of a piercing rod (26), characterized by j a centering and guiding device according to any one of claims 1 to 10 , fixed at the end! 5 before the carriage (30), so that the axes of rotation (42, 44) (62, 64) of the two jaws (38, 40) (58, 60) are arranged symmetrically on either side of the extension of the axis of the gripping device (34) of the piercing rod (26). , ♦! 1 ·! ·