EP0519397B1 - Tap hole drilling machine - Google Patents

Tap hole drilling machine Download PDF

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Publication number
EP0519397B1
EP0519397B1 EP92110142A EP92110142A EP0519397B1 EP 0519397 B1 EP0519397 B1 EP 0519397B1 EP 92110142 A EP92110142 A EP 92110142A EP 92110142 A EP92110142 A EP 92110142A EP 0519397 B1 EP0519397 B1 EP 0519397B1
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EP
European Patent Office
Prior art keywords
tap hole
drilling machine
hole drilling
guide channel
drill rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP92110142A
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German (de)
English (en)
French (fr)
Other versions
EP0519397A1 (en
Inventor
Takashi c/o Plant & Machin. Div. Nippon Yoneda
Hiroyuki c/o Plant & Machin. Div. Nippon Takao
Seiji c/o Plant & Machin. Div. Nippon Watanabe
Fumio c/o Techn. Dev. Bureau Itou
Yoshiaki c/o Techn. Dev. Bureau Nakabayashi
Masamitsu c/o Yawata Works Baba
Masaharu c/o Yawata Works Tomiyasu
Kazuhiro Iwakuma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Nippon Steel Plant Designing Corp
Original Assignee
Nittetsu Plant Designing Corp
Nippon Steel Corp
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Priority claimed from JP17034491A external-priority patent/JPH04371508A/ja
Priority claimed from JP7849991U external-priority patent/JPH0622353U/ja
Priority claimed from JP9590491U external-priority patent/JP2535445Y2/ja
Priority claimed from JP9771991U external-priority patent/JPH0545051U/ja
Application filed by Nittetsu Plant Designing Corp, Nippon Steel Corp filed Critical Nittetsu Plant Designing Corp
Publication of EP0519397A1 publication Critical patent/EP0519397A1/en
Application granted granted Critical
Publication of EP0519397B1 publication Critical patent/EP0519397B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/12—Opening or sealing the tap holes

Definitions

  • the present invention relates to a tap hole drilling machine for making a tap hole at a blast furnace.
  • a tap hole drilling machine is a machine for making a tap hole at the furnace wall made from refractory materials, which holds a drill rod, drill metal bar or bit drill, gives impacts, revolutions and feeding (forwarding) to the drill, thereby making a hole, or gives reversed impacts, revolution and back-feeding (retreating) to the drill after the completion of the hole, thereby withdrawing the drill and making a tap hole.
  • FIG.16 A schematic structural view of a conventional tap hole drilling machine is shown in Fig.16, where a drill rod 1 is held by a drifter 2 and a drill support (tip end support) 3 and given impacts and revolutions by the drifter 2 to make a hole at the tap hole furnace wall 4, as shown in Fig. 15.
  • Numeral 5 is the tap hole and 23 is a trough.
  • the drifter 2 is suspended below and along a guide channel (guide cell) 6 and moves forwards or backwards through a chain 8 linked to a feeding air motor 7 mounted on the guide channel 6 and the drifter 2 and chain wheels 9 by driving of the feeding air motor 7.
  • Fig.16 A schematic structural view of a conventional tap hole drilling machine is shown in Fig.16, where a drill rod 1 is held by a drifter 2 and a drill support (tip end support) 3 and given impacts and revolutions by the drifter 2 to make a hole at the tap hole furnace wall 4, as shown in Fig. 15.
  • Numeral 5 is the tap hole and 23
  • a hacker 10 is provided at the tip end of the guide channel 6 and engaged with a hacker hook 11 fixed at the tap hole furnace wall 4 to position the guide channel 6 and support the counter-force from the tape hole furnace wall 4 during the drilling.
  • the hacker 10 is rotatably engaged with the hacker hook 11.
  • Numeral 24 is a heat-preventing plate provided at the tip end of the guide channel 6.
  • a unit for re-treating the tap hole drilling machine supports the guide channel 6, and moves it between the drilling position and the retreat position.
  • a suspender arm 12 is pivotally moved by a suspender air cylinder 13, and suspends the guide channel 6 linked through a pin 14.
  • a front arm 15 is linked to through a pin 16 at its both ends and is pivotally moved according to the movement of the suspender arm 12 to maintain the inclination of the guide channel 6.
  • the front arm 15 is also pivotally moved by an air cylinder 17 for engaging or disengaging the hacker 10 with the hacker hook 11.
  • the foregoing members 12 to 17 are mounted on a suspender frame 18 and integrated.
  • a rotary beam 19 is linked to a bearing supported by a post 20 through a shaft at one end and is rotatable by a rotating motor, and is also linked to the suspender frame 18 through a shaft at the other end.
  • the tap hole-drilling machine body can be rotated by rotation of the rotary beam 19.
  • a stopper 21 stops the rotation of the rotary beam 19 to the drilling position and positions the suspender frame 18.
  • a synchronizing beam 22 rotates according to the rotation of the rotary beam 19 to determine the inclination of the tap hole-drilling machine body on (from) the horizontal plane during the rotation.
  • One problem is due to use of a compressed air-driving type in the tap hole drilling machine, using compressed air as a driving source, since the tap hole drilling machine is subjected to high temperature molten iron and slag splashed from the tap hole of a blast furnace when the tap hole is made by the tap hole drilling machine and receives the heat of radiation of the hot molten iron from the underside, and it has been deemed impossible to use an oil hydraulic driving system with a combustible oil.
  • One of them is a metallic rod withdrawal method for making a tap hole, which comprises filling mud into an open tap hole under pressure by a mud gun, thereby closing the tap hole, driving a metallic rod through the filled mud into the furnace by a tap hole drilling machine before the filled mud is solidified by firing, and withdrawing the metallic rod also by the tap hole drilling machine when molten metal is discharged from the blast furnace.
  • Japanese Utility Model Publication No. 54-32981 discloses provision at the tip end of a guide channel (a unit for supporting a tap hole drill rod), which comprises a guide plate for guiding the tap hole drill rod freely in the vertical direction, a dropoff-preventing member fixed to the guide plate or guide channel, an engagement member with the dropoff-preventing member and a tap hole drilling rod support pin inserted movably into the opening at the bottom end of the guide plate.
  • the unit for supporting a tap hole drill rod can prevent a center-off deformation of the rod between the fired mud to be drilled at the tap hole drilling operation and the drifter as a power source due to a compression load in the longitudinal direction at the tap hole drilling operation by restricting the rod at the tip end of the guide channel to some extent.
  • the proposed support of the rod at the tip end of the guide channel is effective, but such a circulation phenomenon that the rod tip end moves around to make a circle appears when the rod tip end is contact with the fired mud right after the start of tap hole drilling operation, and the proposed unit cannot suppress the circulation motion in the vertical direction.
  • the use of the support pin requires manual labor near the tap hole drilling machine.
  • hot molten iron at about 1,500°C is discharged though the tap hole at the completion of the tap hole drilling operation, and since the unit for supporting the tap hole rod is of a fixed type, there is a high possibility for damaging the unit by melting.
  • linearity of guide channel in the tap hole drilling machine that is, a drill is set to the required tap hole drilling position before the tap hole drilling operation, and in order to transfer the power from the drilling machine to the tip end of the drill securely during the tap hole drilling operation, it is the premise that the guide channel has a linearlity.
  • Deteriorating factors for the linearity are mechanical deformation due to the drilling counterforce at the drilling and thermal deformation due to the high temperature atmospher around the tap hole of a blast furnace.
  • the former factor can be well eliminated by designing to increse the cross-sectional rigidity of the guide channel, and the latter factor is eliminated by the conventional procedure for maintaining the linearity, that is, by cooling with compressed air.
  • the cooling procedure is to cool the guide channel by passing compressed air for the drilling machine or for this cooling purpose through the hollow chamber formed along the guide channel from the rear end to the tip end.
  • the air cooling of the guide channel alone is not sufficient, because in case of the above-mentioned metallic rod withdrawal method for making a tap hole which comprises driving a metallic rod into an unfired mud filled in the tap hole by a mud gun after the completion of the closing operation of the tap hole of a blast furnace, thereby making the metallic rod for an advance hole remain in the mud, and withdrawing the metallic rod at the next discharge of molten iron, (which can be also called a withdrawal tap-hole-drilling method or a prehole-preparing type tap-hole-drilling method), the guide channel is exposed to a very hot atmosphere due to the heat of radiation, etc.
  • the metallic rod withdrawal method has been used owing to improvements of muds endurable for discharge of molten iron for a prolonged run so far made to reduce the run number of molten iron discharge, which largely contributes to a decrease in the production cost of molten iron. That is, improvement of muds has increased the mud strength, but, in the conventional case of making a tap hole by a bit rod during the drilling operation, more operating time has been required for the necessary discharge of molten iron, giving a large influence on the blast furnace operation. Thus, a metallic rod has been driven into the unfired mud to make an advance hole through the mud, before the mud has not had a sufficient strength.
  • the guide channel undergoes thermal deformation only with air cooling and the linearity of the guide channel cannot be maintained. That is, the power of the drilling machine cannot be completely transferred to the tip end of the drill, resulting in the prolongation of tap hole drilling operation. Furthermore, the thermal deformation remains permament and it is difficult to set the tap hole drilling machine to the tap hole drilling position. Thus, its adjustment requires additional time as a demerit. A new step for preventing such thermal deformation is in keen demand.
  • a further problem is the positioning of the front part of the guide channel 6 for supporting the drill 1 at the tap hole drilling position by the hacker 10 and the hook 11 in the tap hole drilling machine 2 mentioned before, referring to Figs. 15 and 16, and positioning of the rear part of the guide channel 6 by the unit for retreating the tap hole drilling machine, resulting in a failure to vertically and horizontally move the center of the drill 1.
  • Japanese Patent Application Kokai (Laid-open) No. 54-158310 discloses a technique capable of providing an ideal track for moving a tap hole drilling machine from the retreat position to the tap hole drilling position, where the positioning adjustment of the tap hole drilling position is carried out by a pulling screw, as is obviously different from the tap hole centering made easily by remote control in this invention.
  • the tap hole position of a blast furnace changes with the operating time, and is defined by the outside surface of the tap hole furnace wall in the furnace radial direction and also by the center of the track of mud gun nozzle pressed on the outside surface of the tap hole furnace wall in the vertical and horizontal directions.
  • the mud gun nozzle is pressed onto the outside surface of the tap hole furnace wall to fill mud into the tap hole by a mud gun, it is necessary to keep the outside surface of the tap hole furnace wall smooth to avoid mud leakage.
  • the outside surface of the furnace wall is chamfered or scraped or refractory materials are additionally provided thereto, whereby the outside surface position of the tap hole furnace wall is continuously adjusted in the furnace radial direction.
  • the mud gun is moved from the retreat position to the nozzle-pressing position by revolution and tilting motions in such a manner that the nozzle tip end can trace a certain track.
  • the center of the pressing nozzle track also moves in the vertical and horizontal directions by an influence of the movement of the position of the pressed outside surface of the tap hole furnace wall in the furnace radial direction.
  • This problem has been solved actually at the site by moving the drill support (tip end support) 3 in the vertical and horizontal directions to move the center of the drill tip end in these directions, thereby centering of the tap hole.
  • This method can conduct the tap hole centering at the outside surface of the tap hole furnace wall, but still has another problem, because the movement of the drill support 3 in the vertical and horizontal directions leads to decentering between the guide channel center and the drill support center.
  • the center of the drill support tip end depends on the center of the drill support, whereas the center of the drill rear end depends on the drifter. Since the drifter moves along the guide channel, a center deviation angle between the drill rod and the guide channel is increased with the drifter movement.
  • the curved drill rod is inserted into the furnace wall, and furthermore the rod curve angle is incerased at the final stage of drilling.
  • impacts and revolution are given to the curved drill rod to transfer the impact force and rotary force to the bit at the drill rod tip end, thereby making a tap hole at the tap hole furnace wall, obviously the drill rod is bent and the drilling capacity is lowered. Actually, failures to make a tap hole have been encountered.
  • EP-A-0 379 018 describes a process and an apparatus for opening a tap hole of a furnace by pulling out a rod which is secured in the hardened material of the tap hole.
  • a coupling means is pushed on the end of the rod and the rod is pulled outward by means of a grip attached to a hydraulic cylinder.
  • a working tool which is driven by a pneumatic or hydraulic fluid.
  • LU-A-74398 shows a blast furnace tap hole drilling apparatus which is mounted so as to be movable between a tap hole drilling position and a retract position. There is provided a drilling machine with a bar. Only the revolution and advancing mode of the drilling machine can be driven by hydraulic or pneumatic fluid.
  • An advantage of the present invention is that no oxygen gas in the making of a tap hole is used and to provide a tap hole drilling machine with a member for restricting and supporting a drill rod at the guide channel tip end, capable of incresing a restriction force for preventing deformation or curving of the drill rod, carrying out a remote controlled operation, and retreating the member for restricting and supporting the drill rod, thereby preventing contact with molten iron discharged at the opening of a tap hole and preventing the molting loss.
  • Another advantage of the present invention is to provide a tap hole drilling machine in a structure capable of preventing thermal deformation of the guide channel even under a drilling operation of high thermal load, thereby securing the linearity of the guide channel necessary for transmitting a power of the drill to the tip end of the drill rod securely.
  • a tap hole drilling machine capable of readily centering the tap hole by a remote control, thereby, preventing mud leakage when the tap hole is filled with mud by a mud gun and preventing a failure to make a tap hole due to the curving of the drill rod at the making of the tap hole, and thereby effectively and securely conducting the molten iron discharge operation.
  • a tap hole drilling machine for giving impacts and revolutions to a drill rod supported by a drifter movable forwards or backwards along a guide channel by a feed motor provided at the rear end of the guide channel, thereby making a tap hole at a blast furnace wall, characterized by using an oil hydraulic driving in any or all of impacts, revolutions or reversed impacts by the drifter, providing an oil hydraulic unit as a driving source at a position far from the tap hole drilling machine, connecting an oil hydraulic piping between the oil hydraulic unit and the tap hole drilling machine, using a non-inflammable oil as a hydraulic fluid, enclosing the drifter with a heat-resistant cover and subjecting the inside of the heat-resistant cover to forced cooling.
  • the tap hole drilling machine When a tap hole is made by a tap hole drilling machine, the tap hole drilling machine is splashed with high temperature molten iron and slags gushed from the tap hole of a blast furnace or exposed is the heat of radiation of the molten iron from the bottom side.
  • the oil hydraulic unit as a driving source is provided at a position far from the tap hole drilling machine, and an oil hydraulic pipe is used to connect the oil hydraulic unit to the tap hole drilling machine.
  • a non-inflammable oil is used as a hydraulic fluid and the drifter is enclosed with a heat-resistant cover, while the inside of the heat-resistant cover is subjected to forced cooling.
  • the drifter of an oil hydraulic driven, tap hole drilling machine has a structure based on that of an oil hydraulic rock drill generally used in the fields of civil engineering, mining and quarrying, where the impact force is intensified by enlarging the piston diameter and a reversed impact system is additionally provided, and such a non-inflammable oil such as water glycol, etc. is used as a hydraulic fluid.
  • a non-inflammable oil such as water glycol, etc.
  • packing and O-ring materials nitrile rubber (NBR rubber) suitable for water glycol is used.
  • NBR rubber nitrile rubber
  • As accumulator diaphragm materials special rubber, whose durability has been confirmed by the immersion test such as Vulcarsuper (trademark of a product made by Japan Vulcar K.K., Japan) is used.
  • the heat-resistant cover for protecting the drifter is made of a steel plate to shield the splashed molten iron and slags, and preferably is lined with a heat-resistant plate, and encloses the drifter, while the inside of the heat-resistant cover is further subjected to forced cooling. Forced cooling is most effectively conducted by passing cooling air through the inside of the heat-resistant cover.
  • a water cooled jacket can be provided at the inside surface of the heat-resistant cover at the same time.
  • the oil hydraulic pipe (hose) is of pressure resistance and heat resistance.
  • Drifter protective actions of the heat-resistant cover enclosing the drifter and forced cooling air for the inside of the heat-resistant cover are effective for preventing intrusion of high temperature molten metal and slags into the heat-resistant cover and for shielding the heat of radiation of the molten iron and slags from the bottom side.
  • the temperature of the drifter itself can be kept as low as the room temperature and the packing and O-ring rubber of the drifter can be prevented from earlier deterioration, and also the hydraulic oil such as water glycol can be prevented from earlier deterioration. A risk of ignition and combustion of the the hydraulic oil can be completely eliminated.
  • the present tap hole drilling machine according to the first aspect of the present invention when further provided with means according to a second, a third and/or a fourth aspect of the present invention as given below, can be more stabilized and brought into more preferable modes of embodiment.
  • a tap hole drilling machine further characterized by a unit for restricting and supporting, which comprises a dividable block divided into at least two portions that restricts a drill rod in the circumferential direction and has a thickness of 10 mm or more and a dividable ring plate for supporting the block, the dividable ring plate being connected to a driving cylinder through a lever, thereby allowing the dividable ring plate to be opening or closing-free in a direction of a right angle to the longitudinal direction of the guide channel and the drill rod to be restricted or released from restriction through the dividable block.
  • the circulation phenomenon of the drill rod tip end right after the start of the drilling operation can be controlled to suppression by restricting the drill rod in the circumferential direction. Since the dividable block is made of steel, the effect to stably support the drill rod is small, if the thickness of the block is less than 10 mm, and thus the block must have a thickness of 10 mm or more and must be preferably in a thickness range of 50 to 100 mm.
  • Division of the dividable block into at least two portions facilitates insertion of the drill rod into the block, and further supporting (restriction) or releasing of the drill rod by the block.
  • the dividable ring plate for supporting the dividable bock must be opened or closed by a pneumatic or oil hydraulic driven cylinder through a lever, whereby the dividable ring plate can be used by changing the open position to the closed position when the drill rod is mounted on the tap hole drilling machine, and by changing the closed position to the open position to release the restriction and retreat the rod support from the tap front when the drilling operation is advanced and the drill rod is no more circulated, and thus the unit for restricting and supporting the drill rod can be protected from the splashed molten iron and slags gushed from the tap hole just after the drilling operation and there is no fear of melting loss at all.
  • the driving cylinder system can conduct an easy remote controlled operation by a wireless operation, etc., where an operator conducting the opening or closing operation can conduct the operation from a position far from the tap hole drilling machine.
  • a guide channel 6 of a tap hole drilling machine for making a tap hole at a blast furnace it is characterized by a hollow chamber extending from the rear end to the tip end of the guide channel and vice versa along the guide channel of the drilling machine, and an inlet and an outlet for cooling water to and from the hollow chamber being provided at the rear end of the guide channel, whereby the guide channel is made a water-cooled guide channel.
  • hoses or pipings for supplying and discharging water are merely provided at the rear end of the guide channel without any risk of explosion.
  • the heat transfer by air cooling is a few hundred Kcal/m 2 h, whereas that by water cooling a few thousand Kcal/m 2 h, which is about 10 times the cooling capacity of the former, and thus the superiority of water cooling is quite apparent therefrom.
  • Thermal deformation (deflection) of the guide channel can be prevented to a maximum by water cooling, and thus the restricted setting time of a tap hole drilling machine and the capacity of the drifter can be fully utilized, leading to further shortening of the drilling operation time and consequently to reduction in the operator's labor load under the hot circumferences.
  • a system which comprises a tap hole drilling machine body for giving impacts and revolutions to a drill rod supported by a drifter while feeding the drifter forwards along a guide channel by a feed motor provided at the rear end of the guide channel, thereby making a tap hole at a blast furnace wall, and a unit for retreating the tap hole drilling machine, which comprises a suspender arm, a forearm, a rotary beam and a synchronizing beam for holding the tap hole drilling machine body and moving the body between a drilling position and a retreat position, wherein a remote controlled stretching-contracting mechanism and a remote controlled locking mechanism are provided in parallel in each of either the suspender arm or the forearm and the synchronizing beam, and a hacker provided on the guide channel is given a freedom in the vertical and horizontal movements, thereby readily conducting the tap hole centering of the tap hole drilling machine by remote controlled operation.
  • the remote controlled stretching-contracting mechanism is an electrically driven cylinder as a stretching-contracting actuator (driving means or working member) and the remote controlled locking mechanism is an electromagnetic brake provided in the electrically driven cylinder for fixing the actuated electrically driven cylinder.
  • the hacker can be given a freedom in the vertical and horizontal movements by using a hacker in such a structure that the hacker is made of a plate with a notch of a sufficient vertical allowance for engagement with a horizontally provided round bar of hook, the hook being in such a structure as to support the horizontally provided round bar by steel side plates at both ends of the round bar, and also with a sufficient horizontal allowance for the spade between the side steel plates, as shown in Fig. 13.
  • the suspender arm 12 is pivotally moved by a suspender air cylinder 13 and suspends a guide channel 6 connected to the suspender arm 12 by a pin 14.
  • the forearm 15 is connected to by a pin 16 at its both sides, and pivotally moved with the movement of the suspender arm 12 to select the inclination or tilting of the guide channel 6.
  • the forearm 15 is also pivotally moved by another air cylinder 17 for hacker engagement or disengagement to engage or disengage the hacker 10 with or from a hook 11.
  • the forearm 15 is made stretchable and contractable.
  • a forearm 15 stretching-contracting mechanism 80 and a locking mechanism 81 for fixing the stretched or contracted state, both being remote controlled, are additionally provided on the forearm 15, and the hacker 10 provided on the guide channel 6 is given a freedom in the vertical and horizontal movements.
  • the guide channel 6 can be pivotally moved around the pin 14 to move the hacker 10 at the tip end of the guide channel 6 to a desired level and fix it by the locking mechanism 81.
  • a drill support 3 provided at the tip end of the guide channel 6 moves together with the hacker 10 and thus its level can be set by moving the hacker 10 to a desired level and fixing it at that level. That is, the tap hole centering in the vertical direction of the tap hole drilling machine can be made by the present unit for tap hole centering.
  • the synchronizing beam 22 is rotated with the rotation of the rotary beam to determine the horizontal inclination of the tap hole drilling machine body at the rotation (i.e. angle of the center line of the tap hole drilling machine in the longitudinal direction to the center line of a blast furnace in the horizontal direction).
  • the synchronizing beam is made stretchable and contractable, and a remote controlled stretching-contractable mechanism 83 and a remote controllable locking mechanism 84 are additionally provided on the synchronizing beam 22, and the hacker provided on the guide channel 6 is given a freedom in the vertical and horizontal movements.
  • the inclination or tilting of the tap hole drilling machine body can be changed in the horizontal direction.
  • the stretched or contracted state of the stretching-contracting mechanism is fixed by the locking mechanism 84. That is, the tap hole-centering of the tap hole drilling machine can be made in the horizontal direction by the present unit for tap hole centering.
  • Tap hole centering operation of the present tap hole drilling machine provided with the unit for tap hole centering is carried out in the following procedure:
  • Fig. 1 is a side view of the oil hydraulic driven tap hole drilling machine according to the first aspect of the present invention.
  • Fig. 2 is a schematic view showing a conceptual flow of oil hydraulic piping to a drifter 2 and from an oil hydraulic unit 25 shown in Fig. 1.
  • Fig. 3 (a) is a schematic, partially cross-sectional, enlarged side view of the drifter 2 shown in Fig. 1.
  • Fig. 3 (b) and Fig. 3 (c) are views showing the structure of a heat-resistant cover shown in Fig. 3 (a), where fig. 3 (b) is a cross-sectional view along the line A-A of Fig. 3 (a) and Fig. 3 (c) is a cross-sectional view along the line B-B of Fig. 3 (a).
  • Fig. 4 is a rear view of a unit 50 for restricting and supporting a drill rod in Fig. 1 according to the second aspect of the present invention, when the drill rod is restricted and supported.
  • Fig. 5 is a rear view of the unit 50 for restricting and supporting a drill rod, in Fig. 1, when the drill rod is in an open position of the unit.
  • Fig. 6 is a side view of a unit 50 for restricting and supporting a drill rod and a drill rod support 3 in Fig. 1, when the drill rod is restricted and supported.
  • Fig. 7 is a front view of the drill rod support 3 in Fig. 1, when the drill rod 1 is supported form the downside.
  • Fig. 8 is a front view of a unit 57 for restricting and passing the drill rod in Fig. 1 when the drill rod 1 is in a restricted and supported position or in an open position.
  • Fig. 9 is a side view of a tap hole drilling machine right before the start of the drilling operation according to the third aspect of the present invention.
  • Fig. 10 (a) and Fig. 10 (b) are views showing a hollow chamber formed in the guide channel, where Fig. 10 (a) is a cross-sectional partial view along the line corresponding to the line A-A of Fig. 9, and Fig. 10 (b) is a side view at the tip end (the rear end) corresponding to that of Fig. 9.
  • Fig. 10 (c) is a cross-sectional partial view along the line corresponding to the line B-B of Fig. 10 (b).
  • Fig. 11 (a) and Fig. 11 (b) are cross-sectional views of another hollow chamber in the guide channel, where Fig. 11 (a) is a cross-sectional view along the line corresponding to the line A-A of Fig. 9 and Fig. 11 (b) is a side view at the tip end (the rear end) corresponding to that of Fig. 9.
  • Fig. 12 (a) and Fig. 12 (b) are cross-sectional views of other hollow chamber in the guide channel, where Fig. 12 (a) is a cross-sectional view along the line corresponding to the line A-A of Fig. 9 and Fig. 12 (b) is a side view at the tip end (the rear end) corresponding to that of Fig. 9.
  • Fig. 13 is a structural view showing the outline of a tap hole drilling machine according to the fourth aspect of the present invention.
  • Fig. 14 is an enlarged cross-sectional view along the line A-A of Fig. 13, showing that an electromagnetic cylinder 83 fixes a synchronizing beam 22 in a stretched or contracted state by a brake 84 provided in the electrically driven cylinder.
  • Fig. 15 is a side view of a conventional, compressed air driven tap hole drilling machine.
  • Fig. 16 is a structural view of the outline of the conventional tap hole drilling machine shown in Fig. 15.
  • Fig. 1 is a side view of the present oil hydraulic driven tap hole drilling machine
  • Fig. 2 shows a conceptual flow of an oil hydraulic unit and an oil hydraulic piping.
  • a drill rod 1 is held by an oil hydraulic driven drifter 2 and given impacts and revolution or reversed impacts and revolutions by an oil hydraulic, reversed impact-giving maschine 2a at the drifter 2 to make a tap hole 5 at a tap hole furnace wall 4.
  • the drifter 2 is suspended below a guide channel 6 and moves forwards or backwards by a feed air motor 7 mounted on the guide channel 6 through a chain 8 connected between the motor 7 and the drifter 2 and linked between chain wheels 9.
  • an oil hydraulic unit 25 comprises an oil tank 26 containing water glycol as a hydraulic fluid, oil hydraulic pumps 27, relief valves 28, and switch electromagnetic valves 29, and the oil hydraulic unit 25 is located at a position far from the drifter 2.
  • Oil hydraulic pipings comprise steel pipes 30, flexible hoses 31 and a hose reel 32 and connect the switch electromagnetic valves 29 of the oil hydraulic unit 25 to the drifter 2 of the tap hole drilling machine.
  • the hydraulic fluid under the pressure increased by the oil hydraulic unit 25 is led to the drifter 2 through hose reel 32 to drive the drifter 2 and then discharged into the oil hydraulic unit 25.
  • the structure of the present oil hydraulic driven, tap hole drilling machine is based on an oil hydraulic rock drill generally used in the fields of civil engineering, mining and quarrying, when the piston diameter is enlarged and the impact force is intensified and reversed impacts are additionally made applicable, and a non-inflammable oil such as water glycol, etc. is used as a hydraulic fluid.
  • a heat-resistant cover 43 is made of a steel plate, and lined with an asbest plate 44 as a heat-insulating material, and forecedly cooled by air blowing, from air-blowing-off holes 46 of air pipings 45, whereby the oil hydraulic driven drifter 2 and flexible hoses 31 are protected against the surrounding heat.
  • Numeral 47 is a water cooled jacket provided on the inside surface of the heat-resistant cover.
  • the drill rod 1 is a long rod provided with a bit as a cutting knife at the tip end of the rod, and when the unit 50 for restricting and supporting the drill rod is used, it supports the rod in the circumferential direction so precisely that the rod provided with a bit may not be bent or curved due to the impact force and revolution force given by the oil hydraulic driven drifter 2 with increased power as shown by data in the afore-mentioned Table 1. Further, the use of the unit 50 for restricting and supporting the drill rod and the unit 57 for restricting the passing drill rod is more preferable.
  • an air motor is used as the feed motor, but an oil hydraulic motor can be used in place of the air motor.
  • “Withdrawal” in Table 2 or the metallic rod withdrawal means for making a tap hole is a method for making a tap hole, wherein a metallic rod is drived up to the inside of the blast furnace before the mud is fired and cured, and then when the molten iron is discharged, the metallic rod is withdrawn by using a tap hole drilling machine, as afore-mentioned.
  • "Normal one-run drilling” in Table 2 or the normal one-run drilling means for making a tap hole is a method for making a tap hole, wherein a drill rod provided a bit at its tip end is given impacts and revolutions by a drifter right before the molten iron-discharging operation, thereby making a tap hole at a stretch.
  • the oxygen-aided hole drilling conducted in the normal one-run hole drilling means such a case that, when it was completed to drill the mud at the blast furnace wall inside and the drill rod was withdrawn, the tip portion of the drill rod was cut on the way and retained in the mud in the blast furnace wall and thus the retained tip portion was molten by blowing an oxygen gas thereto.
  • FIG. 1 shows the state that a tap hole drilling machine (drifter 2) of the present invention is provided above the trough 23 in front of the tap hole furnace wall 4 of a blast furnace.
  • a unit 50 for restricting and supporting a drill rod 1 is provided at the tip end of the guide channel 6 of the tap hole drilling machine which is also supported by engagement of a hacker with a hook 11 provided on the furnace wall of the blast furnace.
  • the unit 50 for restricting and supporting a drill rod 1 supports and restricts the drill rod 1 during the drilling operation, and when the drilling is so advanced that the tip end of the drill rod is drilled into the mud and driven into the tap hole 5, and when any circulation movement of the tip end no more takes place, the restriction and supporting of the drill rod are released so that the drill rod can be retreated and protected against the splashing of the molten iron and slags gushed from the tap hole.
  • the restriction and support of the drill rod can be more stabilized by providing a unit 57 for restricting the passing drill rod at the intermediate position of the drill rod, where the unit 57 can freely restrict and support the drill rod or release the restriction of the drill rod.
  • Figs. 4 and 5 are rear views of a unit 50 for restricting and supporting a drill rod, as viewed by facing the tap hole 5 as the foreground, where Fig. 4 shows the state of supporting the drill rod 1 and Fig. 5 shows the state of the drill rod in an open position.
  • Fig. 6 is an enlarged view of the tip end part of the tap hole drilling machine in Fig. 1 and shows the side view of the drill rod 1 in case that it is restricted and/or supported by the unit 50 and the drill support 3.
  • a block 51 for restricting the drill rod 1 is dividable into two parts and a hole having a similar diameter to the outer diamerter of the drill rod 1 can be formed at the center of the block 51.
  • a ring plate 52 which can be divided into two parts, fixes the block 51 and is connected to a driving cylinder 54 through levers 53.
  • an air cylinder is used as the driving cylinder 54, but can be an oil hydraulic cylinder.
  • Numeral 55 is a support for the driving cylinder 54.
  • the top ends of the ring plates 52 are pivotally movable fixed to the guide channel 6.
  • the driving cylinder 54 can be remote controlled, and the ring plate 52 can be opened or closed by the stretching or contracting motion of the driving cylinder 54 through the levers 53, thereby opening or closing the block 51.
  • the block parts and the ring plate parts can be freely gone up and down and the drill rod 1 is released from the restriction and supporting and retreated to the backside of a heat-resistant plate 24 provided at the tip end of the guide channel 6 and avoided molten loss due to the splashing of molten iron and slags.
  • the upper portions 52a of the ring plates 52 are put in recesses formed at the lower side flange of the guide channel 6.
  • Materials for the block 51 is iron or steel and the block has a thickness of 10 mm or more and a sufficient strength to restrict the drill rod 1.
  • the block 51 and the ring plate 52 are dividable into two parts, but may be divided to 3 or more parts.
  • numeral 3 is the side view of the drill rod support
  • Fig. 7 is a cross-sectional view along the line A-A of Fig. 6 of the drill rod support 3.
  • the drill rod support 3 supports the drill rod 1 at the downside and is used when the drill rod 1 is mounted on the drifter 2, the unit 50 for restricting and supporting the drill rod, and the unit 57 for restricting the passing drill rod.
  • Number 58 is a driving cylinder and number 59 is a lever.
  • performance for preventing the buckling of the drill rod can be more improved by providing at the intermediate position of the guide channel 6, a unit 57 for restricting the passing drill rod in addition to the drill rod support 3 and the unit 50 for restricting and supporting the drill rod 1, which unit 57 comprises a block dividable into an upper block part 60 and a lower block part 61, which restrict the drill rod in the circumferential direction, the upper block 60 being connected to a driving cylinder 63 through a lever 62, thereby making the block free of opening or closing in the direction of a right angle to the longitudinal direction of the guide channel 6, the unit 57 being fixed on a trolley 64 travelling along the guide channel 6.
  • Fig. 9 shows a tap hole drilling machine according to the present invention right before the start of drilling operation.
  • the guide channel 6 of the tap hole drilling machine is set to the tap hole 5 at the blast furnace wall by the hacker 10 and supports 12 and 15.
  • the drifter 2 and the drill rod (bit rod) 1 are suspended from the guide channel 6 and a tap hole is drilled through filled mud 70 up to the furnace inside by impacts, revolutions and feeding of the drill rod 1 given by the drifter 2.
  • thermal deformation of the guide channel 6 due to the expansion of the underside of the guide channel takes place owing to the heat from the molten iron and slags 71 remaining in the trough 23, whereby the hacker 10 is disengaged from the engagement position on the furnace wall or the forces given by the drifter 2 are not directly transferred to the tip end of the drill rod 1, resulting in prolonged drilling operation.
  • an inlet 72 and an outlet 73 for cooling water are provided at the rear end of the guide channel 6 to prevent the thermal deformation. That is, the thermal deformation is prevented by passing cooling water through a hollow chamber 74 extending from the rear end to the front end of the guide channel 6 and vice versa to cool the guide channel 6, thereby eliminating the thermal deformation.
  • Fig. 10 (a) shows the hollow chamber 74, and the inlet 72 and the outlet 73 for cooling water of Fig. 9 along the line A-A
  • Fig. 10 (b) shows the tip end part of the guide channel 6 in Fig. 9.
  • the hollow chamber 75 is at the water inlet side and the hollow chamber 76 is at the water outlet side. Since the guide channel 6 is provided with a drifter mounting bed 77 and a driving chain 8, and thus the hollow chamber 75 and 76 must be so provided as not to disturb the functions of these units.
  • the hollow chambers 75 and 76 are provided at the lower outsides of the guide channel 6, respectively and are connected to each other at the tip end part through a connecting pipe 78.
  • the hollow chambers must be provided in the longitudinal direction of the guide channel 6 and may be at the insides of the guide channel 6, if the inside position may not interfere with other units. Cooling water can be supplied from the rear end and discharged from the tip end of the guide channel 6 or vice versa, but extension of the hose or piping for cooling water from the rear end part to the tip end part is required, a further problem appears in such provision or no better cooling efficiency is obtained.
  • Fig. 11 (a) and Fig. 11 (b) show hollow chambers 75 and 76 provided at the upper side and the lower side of the guide channel by separating the cooling water inlet side from the cooling water outlet side. In case of the system of these hollow chambers 75 and 76, a connecting pipe 78 at the tip end part is not needed.
  • Fig. 12 (a) and Fig. 12 (b) show a lower hollow chamber 75 at the inlet side and an upper hollow chamber 76 at the outlet side through the guide channel, separated by each other by a partion wall 79, whereby the cooling is intensified.
  • a connection pipe at the tip end part of the guide channel 6.
  • Fig. 13 is the structural view showing the outline of one embodiment of the present invention, where a drill rod 1 is supported by a drifter 2 and a drill rod support 3 and given impacts and revolutions by the drifter 2 to drill a tap hole at the tap hole furnace wall.
  • the drifter 2 is suspended from a guide channel 6 to move forwards or backwards by a feed air motor 7 mounted on the guide channel 6 through a chain connected to the motor 7 and the drifter 2 and linked between chain wheels.
  • a hacker 10 is provided at the tip end of the guide channel 6 and engaged with a hook 11 fixed at the tap hole furnace wall to support counterforces from the tap hole furnace wall during the drilling operation.
  • the hacker 10 is in such a structure that the hacker 10 is made of a plate with a notch of sufficient vertical allowance for engagement with a horizontally provided round bar of hook 11, the hook 11 being in such a structure as to support the horizontally provided round bar by steel side plates at both ends of the round bar, and also with a sufficient horizontal allowance for the space between the side steel plates, as shown in Fig. 13.
  • a unit for retreating the tap hole drilling machine supports the guide channel 6 and moves it between the drilling position and the retreat position.
  • the suspender arm (12) is pivotally moved by a suspender air cylinder 13 and suspends the guide channel 6 connected by a pin 14.
  • the forearm 15 is connected by a pin 16 at both ends, and is pivotally moved according to the movement of the suspender arm 12 to select the inclination or tilting of the guide channel 6. Furthermore, the forearm 15 is pivotally moved by an air cylinder 17 to make engagement or disengagement of the hacker 10 with or from the book 11.
  • the forearm 15 is stretched or contracted and fixed by remote controlled, electrically driven cylinders 80 and brakes 81 provided in the electrically driven cylinders 80 to conduct tap hole centering of the tap hole drilling machine in the vertical directions.
  • the members 12 to 17, 80 and 81 are incorporated and integrated into a suspender frame 18.
  • a rotary beam 19 is connected to a bearing supported by a post 20 through a shaft at one end and rotated by a rotary motor.
  • the other end of the rotary beam 19 is connected to the suspender frame 18 through a shaft, and thus the tap hole drilling machine body can undergo rotary movement according to the rotary movement of the rotary beam 19.
  • a stopper 21 stops the rotary movement of the rotary beam 19 at the drilling position and selects positioning of the suspender frame 18.
  • a synchronizing beam 22 rotates according to the rotary movement of the rotary beam 19 and selects the inclination or tilting of the tap hole drilling machine from the horizontal direction during the rotary movement.
  • the synchronizing beam 22 is provided with a remote controlled, electrically driven cylinder 83 and a brake 84 provided in the electrically driven cylinder 83 to give a freedom in the vertical and horizontal movements to the hacker 10 provided on the guide channel 6. That is, tap hole centering of the tap hole drilling machine in the horizontal direction can be carried out by changing the length of the synchronizing beam by the electrically driven cylinder 83 and fixing the length by the brake 84 provided in the electrically driven cylinder 83.
  • An oil hydraulic cylinder can be used in place of the electrically driven cylinder, and a mechanical locking member may be provided and actuated by applying an on-off oil hydraulic pressure to the mechanical locking member.
  • Fig. 14 shows the state of stretching or contracting the stretchable synchronizing beam 22 by the electrically driven cylinder 83 and fixing the stretched or contracted state by the brake 84 provided in the electrically driven cylinder 83.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)
  • Drilling And Boring (AREA)
EP92110142A 1991-06-17 1992-06-16 Tap hole drilling machine Revoked EP0519397B1 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP170344/91 1991-06-17
JP17034491A JPH04371508A (ja) 1991-06-17 1991-06-17 出銑口開孔機
JP78499/91U 1991-09-27
JP7849991U JPH0622353U (ja) 1991-09-27 1991-09-27 出銑口開孔機の開孔芯合わせ装置
JP9590491U JP2535445Y2 (ja) 1991-10-28 1991-10-28 高炉出銑口開孔機
JP95904/91U 1991-10-28
JP9771991U JPH0545051U (ja) 1991-11-01 1991-11-01 高炉出銑口開孔機
JP97719/91U 1991-11-01

Publications (2)

Publication Number Publication Date
EP0519397A1 EP0519397A1 (en) 1992-12-23
EP0519397B1 true EP0519397B1 (en) 1996-10-09

Family

ID=27466176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92110142A Revoked EP0519397B1 (en) 1991-06-17 1992-06-16 Tap hole drilling machine

Country Status (3)

Country Link
EP (1) EP0519397B1 (ko)
KR (1) KR950001904B1 (ko)
ES (1) ES2091979T3 (ko)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5351939A (en) * 1992-06-17 1994-10-04 Paul Wurth S.A. Machine for piercing a taphole for a shaft furnace
EP0791661A2 (de) * 1996-02-21 1997-08-27 Paul Wurth S.A. Stichloch-Bohrmaschine
US6685876B1 (en) 1999-04-26 2004-02-03 Nippon Steel Corporation Method for automatically controlling hydraulic opener

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Publication number Priority date Publication date Assignee Title
KR100395137B1 (ko) * 1999-05-14 2003-08-21 주식회사 포스코 고로의 출선기기 원격운전시스템
DE102005002516A1 (de) * 2005-01-19 2006-07-27 Penox Gmbh Vorrichtung zum Entfernen fester Schmelzrückstände aus einem Schmelzofen sowie Anlage zur Metalloxidherstellung mit einer derartigen Vorrichtung
US8439566B2 (en) 2010-03-09 2013-05-14 Caterpillar Global Mining Equipment Llc Wear pad adjustment assembly
US8584774B2 (en) 2010-06-04 2013-11-19 Caterpillar Global Mining Equipment Llc Traveling and locking centralizer
CN102261240B (zh) * 2010-08-23 2013-06-05 鞍钢集团矿业公司 精确监控牙轮钻机钻孔深度的装置及其监控方法
KR101366206B1 (ko) * 2012-08-04 2014-02-25 정노조 고로 송풍기의 노즐 슬래그 천공장치
KR101447581B1 (ko) * 2013-11-25 2014-10-07 국도정밀(주) 제련로용 인젝션 노즐 인입장치
EP3475516A1 (en) * 2016-06-24 2019-05-01 Berry Metal Company Pneumatic drilling device
CN107043837A (zh) * 2017-04-26 2017-08-15 河钢股份有限公司邯郸分公司 一种高炉开口机定位的装置
CN112662828B (zh) * 2020-12-09 2022-05-17 本钢板材股份有限公司 一种液压开铁口机
CN115323090B (zh) * 2022-03-24 2023-10-31 中钢集团西安重机有限公司 一种钻杆用支撑和防滑出工装、基于该工装的钻杆使用方法

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US3190629A (en) * 1965-06-22 Draper blast furnace tapping rig
US2460711A (en) * 1949-02-01 O hare
US3262692A (en) * 1966-07-26 Furnace botting and tapping apparatus
US4023626A (en) * 1975-03-17 1977-05-17 Oy Tampella Ab Self-adaptive hydraulic rock drill
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LU83335A1 (fr) * 1981-05-05 1983-03-24 Wurth Paul Sa Dispositif de centrage et de guidage d'une tige de percage du trou de coulee d'un four a cuve et perceuse pourvue d'un tel dispositif
US4431171A (en) * 1982-03-04 1984-02-14 Bailey Industrial Products, Inc. Apparatus for opening the tap hole of a metallurgical furnace
LU87427A1 (fr) * 1989-01-16 1990-07-24 Wurth Paul Sa Procede et dispositif d'ouverture du trou de coulee d'un four a cuve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5351939A (en) * 1992-06-17 1994-10-04 Paul Wurth S.A. Machine for piercing a taphole for a shaft furnace
EP0791661A2 (de) * 1996-02-21 1997-08-27 Paul Wurth S.A. Stichloch-Bohrmaschine
US5888448A (en) * 1996-02-21 1999-03-30 Paul Wurth S.A. Tap-hole drilling machine
US6685876B1 (en) 1999-04-26 2004-02-03 Nippon Steel Corporation Method for automatically controlling hydraulic opener

Also Published As

Publication number Publication date
ES2091979T3 (es) 1996-11-16
EP0519397A1 (en) 1992-12-23
KR950001904B1 (ko) 1995-03-06
KR930000692A (ko) 1993-01-15

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