FR2502175A1 - PUNCHING MACHINE - Google Patents

Abstract

MACHINE FOR DRILLING CASTING HOLES INCLUDING THE DRILL HAMMER 2 GUIDES BY A AFFUT 1 THAT CAN BE SWIVEL IN AND OUT OF THE WORKING POSITION IS USED FOR THE RECTILINE MOVEMENT OF A DRILLING, PERCUSSION OR CASTING ROD 5, A GUIDE 6 FOR THE ROD 5 BEING PROVIDED ON THE END OF THE AFUT 1 NEAR THE OVEN; THIS MACHINE INCLUDES AN ADDITIONAL SUPPORT DEVICE 8 FOR THE ROD 5. THE SUPPORT DEVICE 8 CAN BE MOUNTED TO SLIDE OR STAY AT A FIXED POSITION ON THE HOLDER 1 AND IS CONTROLLED BY THE WORKING CYCLE OF THE DRILLING MACHINE. 'IT RELEASES ROD 5 WHEN HAMMER 2 IS AT ITS FRONT END-OF-STROKE POSITION AND RELEASES THE PASSAGE OF DRILL HAMMER 2 WHEN APPROACHING THEM.

Description

The present invention relates to a machine for drilling

  casting including guided drill hammer

  by a carriage which can be swiveled into the working position

  vail or out of the latter, is used to move a drill rod, percussion or drilling, the carriage comprising on its end facing the furnace a guide for

the stem.

  The tap holes of metallurgical furnaces, no-

  especially those of blast furnaces are open to date

  by drilling with a drill rod or by pre-drilling

  using the drill rod and knocking out

  then the remaining wall by means of a percussion rod.

  The tools coming into contact with the molten metal inside the furnace then decrease in length by melting but they are maintained even after the return of the drill hammer to its initial position away from the furnace, by a guide provided on the furnace side end of the machine mount. In a more recent process, the tap hole is no longer opened by drilling. After plugging the tap hole and after a determined period of time a steel rod,

  called the piercing rod in the following, is pushed in until

  inside the furnace by means of the hammer drill made to function as a counter hammer and the rod is removed during casting by the working hammer

then in the opposite direction.

  The sprue must be long enough to safely penetrate the interior of the oven. As a result, it generally projects into the interior of the furnace, to a certain extent exceeding the length of the tap hole. This projecting part of the casting rod melts during the time preceding the casting so that it is shortened. When removing the sprue

  the hammer against impact is brought back to its po-

  rear end position. Before the hammer fo-

  reur reaches this end position the rod of

  shortened flow falls out of the guide on the former

  end on the furnace side of the lookout. Due to the dead weight of the casting rod, the gripping devices for coupling the rod to the drilling hammer, the drilling hammer itself and in particular the tool holder inside the hammer or protruding from the hammer , are subject to

  efforts which may cause damage or even

me ruptures of these elements.

  For economic reasons and space it is not possible to reinforce the drill hammer. It would indeed be possible to keep the guide of the rod

  of casting up to a certain wear length in increase

  as the distance separating the front guide from the mounting of the front face of the oven but this increase in the distance would affect the precision of the drilling or the pointing of the casting rod on the desired location and moreover the size of the The whole machine inside the casting workshop would be increased unacceptably. We could also consider interrupting the return stroke of the drilling hammer at the instant when the front end

  of the rod leaves the tap hole but this is impractical

  sand in practice because the operator does not know the consumed length of the sprue and i.e.

  not react quickly enough given the small distance

  this between the casting opening and the rod guide on

the front end of the lookout.

  The object of the present invention is to improve

  a machine for drilling the tap holes so that the tap rod or similar tools are held

  while being guided even after leaving the hole

  without increasing the size of the machine.

  The above problems are solved

  according to the invention by a machine for drilling holes

  which is characterized in that it comprises a device

  positive additional support for the rod.

  In a first exemplary embodiment according to the invention, the additional support device is guided to slide on the carriage. The support system

2502 1 75

  is coupled with the drill hammer so that its coulis-

  is controlled by the forward movement of the drill hammer and that the distance between the support device and the drill hammer has a minimum when the latter is in its forward position and a maximum when the

  hammer drill makes its withdrawal movement.

  The support device includes (advantageous-

  ment) a support arm which can be pivoted below and outside the drill, percussion or casting rod. For this purpose the support arm can be mounted on the support device so as to be able to pivot around an axis substantially perpendicular to the

to the longitudinal axis of the lookout.

  According to another characteristic of the invention

  the device coupling the market support device

  boring plate controls the pivoting movement of the arm

  support so that the latter is separated from the device

  support when the drill hammer is in

  its advanced position and that it is pivoted below the dis-

  positive support when the drill hammer performs its

withdrawal movement.

  A particularly advantageous improvement of the first embodiment is characterized in that the support device is coupled with the drilling hammer by means of control rods which are arranged parallel to the longitudinal axis of the carriage and can

  be moved between appropriately arranged stops

  required, both with respect to the support device and with respect to the hammer drill and in that one of the control rods is coupled by means of a lever

  fork with the support arm to control the swivel

ment of it.

  According to a second embodiment, the dis-

  additional support positive is mounted on a fixed post on the wall and has a pivoting support arm. The support arm for the drill, percussion or casting rod to be supported is mounted to pivot about an axis

2502175 5

  substantially perpendicular to the longitudinal axis of the af-

  shaft and the pivoting of the support arm is controlled by a switch bar fixed to the drill hammer and by

  through a pebble. A return spring is pre-

  seen to rotate the support arm to the initial position or support position. The pivoting of the support arm can also be controlled by a link by

  shapes between the roller and the switch strip.

  A variant of the second embodiment is characterized in that the support arm is mounted to pivot around an axis which is substantially parallel to

the longitudinal axis of the carriage.

  In this case the pivoting of the support arm can be controlled by a rail fixed to the drill hammer and by

  through a roller, the pivoting of the support arm

  port to the support position which can be effected by the own weight of the arm and / or by means of a spring

reminder.

  Instead of the control devices mentioned above

  known and purely mechanical, it is also possible to rotate the support arm of the support device

  additional by means of a pneumatic or hydraulic cylinder

  controlled by the movement or position of the hammer drill or the pivoting movements of the support arm

  can be controlled by an electric adjustment mechanism

than.

  The invention creates an additional support device

  guide for a taphole drilling machine which meets the following requirements with reference to fig. i and 2 appended: 1) When withdrawing the sprue of an initial length L and shortened by fusion of a length t L, and when the stem emerges from the front guide on the mount, the support device additional prevents overloading of the drill hammer and the gripping device for the casting rod thanks to the support of the rod at a distance

  sufficient SL (support length) of the hammer drill at the

  both from the clearance of the front end of the coupling rod

  lée. 2) The additional support device does not impede the movements of advance and withdrawal of the hammer drill over the entire advance length V. 3) The device also allows free pivoting

  in height as well as the lateral pivoting of the whole ma-

  china after sinking the sprue (see arrow-

as in fig. 1 and 2).

  4) The device does not increase the distance A delimited

  ted by the front end of the drill hole and the mouthpiece

of the tap hole.

  ) Opening and closing the support device

  take place automatically and in sync

  nism with the different stages of operation of the

  machine for drilling tap holes.

  Various other features of the invention

  moreover emerge from the detailed description which follows.

  Embodiments of the object of the invention

  tion are shown, by way of nonlimiting examples,

to the accompanying drawings.

  Figs. 1 and 2 schematically illustrate the

  principle of the solution according to the invention.

  Fig. 3 is a schematic side elevation

  of a first example of embodiment.

  Fig. 4 is a top view of the device

of fig. 3.

  Fig. 5 is a top view of a device

  according to a second embodiment.

  Fig. 6 is a view in the direction of the arrow

VI of fig. 5.

  Fig. 7 is a section along line VII-

  VII of fig. 6, some elements not being shown.

  Fig. 8 is a view similar to that of FIG. 6 and in the of a variant of FIG.

tail of fig. 8.

  direction of arrow VIII in fig. 9,

second example of embodiment.

  8a shows in side elevation a

  Fig. 9 is a top view of the shape of

realization according to fig. 8.

  The references used in the description below

  after are also reported in Figs. 1 and 2 insofar as the elements designated by these references are re-

  shown schematically by these figures.

  The tap hole drilling machine is

  essentially formed by a drilling carriage 1 which can be pivoted, in a known manner, vertically and laterally (see arrows in FIGS. 1 and 2). On the carriage 1 is guided to slide a drilling hammer 2 made in the form of a hammer with counter-blows and which has on its end

  opposite the oven 3 (fig. 1 and 2) a gripping device

  sion 4 for mounting a sprue 5. Instead of

  that of the casting rod 5 can also be mounted a drilling rod or an impact rod but in what follows only the casting rod 5 which is particularly concerned with the problems to be solved by the invention. At the end of the carriage 1 facing the furnace is a guide 6 for the sprue 5. The guide 6 can be opened when after having inserted the sprue 5 into the tap hole 7 (fig; 2) from the oven 3, the drilling machine must be pivoted up and laterally in order to move it away from the channel as quickly as possible

  still containing hot iron.

  On the carriage 1 is also mounted for sliding

  ser an additional support device 8 for ti-

  casting ge 5. This support device 8 comprises a support arm 9 which can be brought below the casting rod or moved away from the latter by making it

  pivot about an axis 10 which is substantially perpendicular

  cular with respect to the longitudinal axis of the carriage 1. The

  support arm 9 is fixedly mounted on a shaft on the former

  upper end of which is fixed a fork lever 11.

  The hammer drill 2 and the support device

  additional 8 are coupled with each other by the in-

  intermediate control rods 12, 13 which extend pa-

  parallel to the carriage 1 and are mounted to slide freely in supports 14 of the drill hammer 2 and in supports 15 of the support device 8, the relative movements, as regards their stroke and their direction, being controlled by stops correspon-

  dantes 16, 17, 18, 19 as explained below.

  Fig. 3 shows the hammer drill 2 in its end position in front of the furnace 3, position in

  which it is at its minimum distance c from the available

  additional support sitive 8. The support arm 9

  of the support device 8 has already been removed by pivots-

  lateral and it freed the path of movement of the mar-

  drill hole 2 or at least that of the gripping device

  sion 4 of the latter. The sprue 5 is pushed in.

  in the oven 3. After loosening the

  gripping 4 of the sprue 5 and after opening

  ture of the front guide 6, the drilling machine can be pivoted

  tee upwards and laterally to move it away from the tap hole 7 of the oven 3 because in this position of

  all the mobile elements, the support arm 9 of the device

  supportive sitive 8 also released the sprue 5.

  The extraction of the rod 5 from the tap hole 7 of the oven 3 is explained with reference to FIG. 4. To prepare the casting, the drilling machine is first of all

  brought into the position illustrated in FIG. 3. The dis-

  positive grip 4 of hammer drill 2 is delivered

  plé by connection of forms with the sprue 5 and the guide 6 which is on the end of the mount 1 opposite the oven is closed. At the beginning of the movement behind the drill hammer 2 producing at the same time an effort

  of traction on the sprue 5, the support device

  your additional 8 is not yet moving and its support arm 9 is still in the separated position (in phantom in FIG. 4) until the supports 14 on the drill hammer 2 come into contact with the stops 16 of the control rods 12, 13. The control rods 12, 13 are then driven a distance a and a member

  drive 20 on the stop 19 of the control rod

  of 13 causes the fork lever 11 to pivot

  about 90 relative to its position 11 ′ and therefore the support arm 9 of the support device 8 is pivoted under the casting rod 5. At this instant the length of ap-

  then maximum and predetermined SL = a + b + c is reached.

  (It appears from fig. 3 that c represents the distance between

  countering the gripping device 4 from the center of the arm of

  support 9). When the hammer drill 2 continues to run

  behind the support device 8 is also

  dragged and slides on the carriage 1 because the stops 19 of the control rods 12, 13 have come into contact with the supports 15 on the support device. The sprue 5 shortened by fusion with a length A <L (fig. 1) can then escape from the guide 6 without subjecting the hammer drill 2 and the gripping device 4 to additional and unacceptable forces. As soon as the rod 5 has left the tap hole 7, the whole drilling machine is moved away from the jet of molten iron by pivoting it up and to the side. If the rod

  5 was not supported by the support device

  additional, these movements would generate

  these additional mass inertia which could not

  only be absorbed with difficulty by the pre-

hension 4 and the drill hammer 2.

  When a new shank is inserted

  lée (not shortened) 5 proceed as follows: the casting rod 5 is mounted and tightened in the gripping device 4. During this operation the hammer drill 2 is in its end position distant from the furnace 3 (fig. 2). The relative positions of the hammer drill 2 and the additional support device 8 are shown in FIG. 4 to which the hammer drill

  2 does not, however, occupy the far end position

  from the oven 3 but a location where the additional support device 8 is driven by the control rods 12, 13. Since the new sprue has its initial length L (fig. 1) it rests in the guide 6 on the end of the carriage 1 opposite the oven. During the advancement of the drill hammer 2, the sprue 5 is pressed into the tap hole 7 which has just been plugged for some time. During this forward movement of the drilling hammer 2 the behavior

  of the support device 8 is not critical for a

  advance price b. When the friction force between the support device 8 and the mount 1 is greater than that existing between the sprue 5 and the support arm 9 pivoted under the latter, the support device 8 remains stationary at first. It is possible that the control rod 12 moves at the start with the drill hammer 2 until its stop 18 comes in

  contact with the support 15 on the support device 8.

  If this results in a slight displacement of the support device

  yours 8 this is unimportant and likewise if the conditions

  fractions cause the support arm 9 to swivel apart, this is immaterial since the presence of the additional support device 8 is not

  not necessary when driving in the sprue.

  However, it is very unlikely that the hammer drill 2

  causes during its stroke b the spacing of the support arm

  port 9. This swivel spacing only takes place and

  safely when the supports 14 on the hammer fo-

  reur 2 have reached the stops 17 and then drive

  the control rods 12, 13 or at least the control rod

  command 13 because at this moment the drilling hammer 2 has approached the support device 8 to the point that it becomes necessary to move aside the support arm 9 to free the passage to the drilling hammer 2. The spacing by pivoting

  of the support arm is carried out during the race has of the

  boring hammer 2. After the boring hammer 2 has traveled the distance a, the support device 8 is driven

  by means of the stops 17, 18 of the connecting rods

  command 12, 13 and until it comes into contact with limit switches 21 provided on the carriage 1

250 217 5

  (fig. 4) and that the whole assembly is in its end position near the oven 3 (see also

  fig. 1). Then just open guide 6 to

  see the machine pivot up and away from the oven until the next pour. Figs. 5 to 9 show an exemplary embodiment in which the additional support device 8 'or 8 "is mounted in a fixed position and at a predetermined location of the mount 1. FIGS. 5 to 7 show a support device 8' of this type comprising a support arm 22 which, analogously to the support arm 9 of Figures 3 and 4, is fixedly mounted on a shaft 23 extending approximately perpendicularly to the longitudinal axis of the carriage 1. On the hub 24 of the support arm 22 fixed on the shaft 23 is a lever 25 which carries a roller 26 cooperating with

  a switching bar 27 fixed to the hammer drill 2.

  A bearing 28 for the shaft 23 is connected to the carriage 1 by means of a support 29. When the drilling hammer 2 advances and approaches the support device 8 ', the

  support arm 22 is pivoted about 900 to the posi-

  tion 22 '(fig. 5 and 7) in which it is spaced from the sprue 5 by means of the switching bar 27, the roller 26 and the lever 25 carrying the latter so that the passage for the hammer driller 2 be released. After insertion of the sprue 5 as described with reference to FIGS. 1 to 4, the entire drilling machine provided with the devices according to fig. 5 to 7 can also be swiveled up and to the side after

  opening of the front guide 6 (fig. 1 to 4).

  As soon as the drilling hammer 2 has crossed, during

  its backward stroke, the 8 'support device, the bar-

  switching ratchet 27 releases the lever 25 carrying the roller 26 so that a return spring 30 hooked, on the one hand, to a lever 31 fixed to the shaft 23 and, on the other hand

  part, in an eyelet 32 of the support 29, can

  vote the support arm 22 under the casting rod 5 com-

  pictured in fig. 6. Instead of using a spring

2502 175

he

  reminder 30 to bring the support arm 22 back under the

  casting age 5, it is also possible to provide for cooperation by connecting shapes between the roller 26 and the bar of

  switching 27 (not shown). The progress of the diff-

  further operations is identical to that described

with reference to figs. 1 to 4.

  Figs. 8 and 9 show another embodiment of a support device 8 "mounted on a fixed post on the carriage 1 and in which the support arm 33 is fixed on a shaft 34 which is housed to rotate about an axis substantially parallel to the longitudinal axis of

  the lookout in bearings 35 of a support 36 fixed to the af-

  barrel and which carries on one of its ends facing the furnace, a hub 37 of the support arm 33 and on its other end the hub 38 of a lever 39 carry a roller

  40. A control rail 41 bent according to the pivot-

  the desired roller lever 39 is fixed on the

  drill bit 2. When the drill hammer 2 advances and approaches the support device 8 ", the control rail 41 pivots the support arm 33 upwards and out of the path of the drill hammer 2, as is

  shown in fig. 8. Fig. 8a shows in elevation la-

  the important part of the control rail 41 of the embodiment according to FIG. 8. The control rail 41 can be constituted by a curved tube or by a bar

  of circular section. When running behind the mar-

  boring plate 2 the support arm 33 pivots again

  by its own weight and according to the curvature of the rail

  requests 41 to the support position due to the fact that

  holds, thanks to the location of the center of gravity of the support arm, a lever arm long enough with respect to the axis of rotation of the shaft 34 and thanks to the weight of the support arm 33 a sufficient torque for

  rotate the support arm 33 under the coupling rod

  lée 5. It is also possible to provide in addition a res-

  recall spell not shown. In fig. 8a and 9 the distance a corresponds substantially and analogously to the distance

  in fig. 4, at the control stroke necessary for the

support arm vote 33.

  In the embodiments shown and

  described we preferred to use purely metered commands

  for the additional support device 8, 8 ', 8 "because of their robustness and their reliability but it would not, however, depart from the scope of the invention

  by replacing them with hydraulic or pneumatic cylinders.

  or electrical adjustment mechanisms automatically controlled according to the progress of the various operations.

Claims (14)

  1 - Machine for drilling tap holes, the drill hammer guided by a mount that can be pivoted in or out of the working position, is used to move a drill, percussion or drilling rod, l carriage with at its end opposite the   furnace a guide for the rod, characterized in that it comprises   wears an additional support device (8, 8 ', 8 ") for the rod (5).   2 - Machine according to claim 1, character-   laughing at the fact that the additional support device (8)   is guided to slide on the carriage (1).   3 - Machine according to one of claims 1 and   2, characterized in that the support device (8) is   coupled with the drill hammer (2) so that its sliding   is controlled by the forward movement of the hammer drill (2) and that the distance between the support device   (8) and the drilling hammer (2) has a minimum (c) when   that it is in its forward position and a maximum (SL) when the drill hammer (2) performs its movement withdrawal.   4 - Machine according to one of claims 1 to   3, characterized in that the support device (8) comprises   carries a support arm (9) which can be pivoted below   and outside the drill, percussion or shank lée (5).   - Machine according to claim 4, character-   in that the support arm (9) is mounted on the device.   positive support (8) so as to be able to pivot about an axis (10) substantially perpendicular to the longitudinal axis of the carriage (1).   6 - Machine according to one of claims 1 to   , characterized in that the device (11 to 19) couples the support device (8) to the hammer drill (2) controls the pivoting movement of the support arm (9) so that the latter is moved away from the support device support (8) when the drilling hammer (2) is in its advanced position and it is pivoted below the   support (8) when the drilling hammer (2) is moving withdrawal.   7 - Machine according to one of claims 1 to   6, characterized in that the support device (8) is coupled with the drilling hammer (2) via control rods (12, 13) which are arranged in parallel   to the longitudinal axis of the carriage (1) and can be moved   cées between abutments (16 to 19) arranged in an appropriate manner, both with respect to the support device (8) and by   relative to the hammer drill (2) and in that one (13) of the ti-   control ges (12, 13) is coupled via a   fork lever (11) with the support arm (9) for request the pivoting thereof.   8 - Machine according to claim 1, character-   sée in that the additional support device (8 ', 8') is mounted on a fixed post on the carriage (1) and has a pivoting support arm (22, 33).   9 - Machine according to claim 8, character-   in that the support arm (22) for the drilling rod   age, percussion or casting (5 days to support is mounted   to pivot about an axis (shaft 23) substantially per-   pendulum to the longitudinal axis of the carriage and in that the pivoting of the support arm (22) is controlled by a switching bar (27) fixed to the drill hammer (2) and   by means of a roller (26).   - Machine according to one of claims 8 and   9, characterized in that a return spring (30) is pre-   seen to rotate the support arm (20) in the posi-   initial tion or support position.   11 - Machine according to one of claims 8 and   9, characterized in that the pivoting of the support arm   (22) is obtained through cooperation by for-   mes between the roller (26) and the switch bar (27).   12 - Machine according to claim 4, character-   in that the support arm (33) is mounted for pivoting   ter around an axis (shaft 34) which is substantially parallel 250 217 5   to the longitudinal axis of the carriage (l).   13 - Machine according to claim 12, character-   in that the pivoting of the support arm (33) is controlled by a rail (41) fixed to the drill hammer (2) and by means of a roller (40).   14 - Machine according to one of claims 12   and 13, characterized in that the pivoting of the support arm   port (33) to the support position is effected by its   own weight and / or using a return spring.   15 - Machine according to one of claims 1 to   6 and 8, characterized in that the pivotal movements   support arm (9, 22, 33) are controlled by hydraulic or pneumatic cylinders controlled themselves   depending on the displacement or the position of the hammer fo- reur (2).   16 - Machine according to one of claims 1 to   6 and 8, characterized in that the pivoting movements   of the support arm (9, 22, 33) are controlled by a mechanism electrical adjustment nism.