Classifications

• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D3/00—Charging; Discharging; Manipulation of charge
  • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
  • F27D3/1509—Tapping equipment
  • F27D3/1527—Taphole forming equipment, e.g. boring machines, piercing tools

Definitions

• the present invention relates to a tap hole drilling machine, in particular a tap hole drilling machine for operating a plurality of tap holes on a shaft furnace.
• Modern blast furnaces usually have several tap holes. Each of these tap holes is operated by its own tap hole drilling machine. Since a powerful tap hole drilling machine is relatively expensive, it would of course be interesting to develop a machine that can operate several neighboring tap holes at the same time for cost reasons.
• Such a tap hole drilling machine was already described in DE-A-19 62 953 in 1967.
• This machine comprises a fixed bracket and a boom which is mounted with its first end, pivotable about a first axis, in the fixed bracket.
• the boom tellung by a drive from a first working position in front of the first needle hole in a second work S can be pivoted in front of the second tap-hole, which at its free end a vertical pivot on which a drilling unit is mounted.
• a handlebar is connected by means of swivel joints to a fixed lever arm on the console and to a crank that is firmly seated on the pivot.
• a four-link swivel gear is formed in which a pivoting movement of the arm about the first axis generates a pivoting movement of the mount around the second axis.
• the drill carriage In order to be able to adapt the angle of inclination of the drilling axis to the respective stitch hole, the drill carriage is connected to vertical pivot pins by means of a horizontal swivel joint, and a tilting cylinder is arranged between the drill carriage and a flange rigidly attached to the vertical pivot pin.
• a tilting cylinder In order to adapt the height of the drilling axis to the respective tap hole, on the other hand, it is proposed to move the drill carriage differently close to the tap hole, that is to say to limit the pivoting movement of the boom.
• the present invention has for its object to provide a tap hole drilling machine that allows to change the height and inclination of the drilling axis independently.
• the suspension device has a transmission with a frame, a first drive and two connection points.
• the gearbox is constructed in such a way that a positively guided displacement of the two connection points relative to the frame can be generated by a drive pulse of the first drive, in such a way that a connecting line through the two connection points remains parallel to itself during this displacement.
• a tilting device is equipped with a connection joint, a support joint and a second drive and constructed in such a way that the distance between the connection joint and support joint can be adjusted by a drive pulse of the second drive. It is attached to a first of the two connection points of the transmission via the connection joint.
• the tilting device is connected via its support joint to the drill mount, the second connection point of the transmission by means of a support joint to the drill mount, and the frame to the support structure.
• the tilting device is connected via its support joint to the support structure, the second connection point of the transmission is connected to the support structure by means of a support joint, and the drilling mount is connected to the frame.
• the height of the drill carriage can be adjusted using a single drive without changing the inclination of the drill carriage.
• the transmission comprises a frame and three links which are arranged by means of four rotary joints A, B, C and
• the transmission could also have two X-shaped links, for example, which are connected in the middle via an additional swivel joint.
• the frame and a third link are then each connected to the ends of the two X-shaped links via a simple swivel joint and a combined rotary and thrust joint, the geometrical arrangement of these swivel joints advantageously corresponding to the geometrical arrangement of the corner points of a rectangle.
• This embodiment has the advantage that a pure vertical displacement of the drill carriage can be achieved without a horizontal movement component. However, it is much more complicated to set up due to the rotary push joints and requires considerably more space.
• the transmission is advantageously driven by a pressure cylinder, but could of course also comprise a rotary drive of one of the links.
• the Druckzyiinder advantageously has a stroke limiting device with two independently adjustable strokes, so that the drill carriage, which is advantageously raised to a rest position when approaching a tap hole, can be lowered in the working position to the height of two tap holes of different heights.
• the tilting device is advantageously designed as scissors.
• a pressure cylinder can be attached to this pair of scissors in a particularly simple manner, which, by opening and closing the scissors, makes it possible to adjust the distance between the connecting joint and the supporting joint of the tilting device.
• the pressure cylinder of the tilting device advantageously has a stroke limiting device with two independently adjustable strokes, so that the drill carriage, which is advantageously in a horizontal rest position when approaching a tap hole, can be adapted to the inclination of two differently steep tap holes in the working position.
• Figure 1 a partial view of a tap hole drilling machine according to the invention in a rest position
• FIG. 2 a partial view of the tap hole drilling machine from FIG. 1 in a working position
• FIG. 3 a partial view of the tap hole drilling machine from FIG. 1 in a third position
• FIG. 4 a longitudinal section through an advantageous embodiment of a pressure cylinder for a suspension device of a tap hole drilling machine according to the invention, the main piston assuming a first end position;
• Figure 5 a longitudinal section as in Figure 4, wherein the main piston assumes a second end position.
• FIG. 1 to 3 each show a drill carriage 10 (only shown in sections) and a suspension device 12, by means of which the drill carriage 10 is fastened to a support structure 14.
• the support structure 14 is only indicated schematically for the sake of simplicity.
• Such a support structure can comprise, for example, a rotatably mounted arm, at the free end of which the suspension device 12 is rotatably mounted about an axis 16 (indicated by dashed lines).
• An advantageous embodiment of such a support structure 14 with cantilever is described, for example, in the Luxembourg patent applications of the applicant LU 88799 of August 1, 1996 and LU 88782 of June 28, 1996, the entire disclosure of which is incorporated by reference into the present application.
• the support structure 14 could also comprise a carriage guided in rails, which carries the suspension device 12.
• the suspension device 12 is described in more detail below with reference to FIG. 2. It includes a flat four-link gearbox with four rotary joints ken.
• a first link 18 is designed as a frame of the transmission and is fastened to the support structure 14. This first link 18 has two legs 20 and 22. The first leg 20 is connected to a second link 24 via a joint A. The latter is L-shaped with a first arm 26 and a second arm 28, the joint A being arranged at the intersection of the two arms 26 and 28.
• the second leg 22 of the first link 18 is connected to a third link 30 via a joint B.
• the latter is also L-shaped with a first arm 32 and a second arm 34, the joint B being arranged at the intersection of the two arms 32 and 34.
• a fourth link 36 which is designed, for example, as a rod, is connected to the second arm 28 of the second link 24 via a joint D and to the second arm 34 of the third link 30 via a joint C.
• the four links 18, 24, 30 and 36 are designed such that the distance from joint A to joint D corresponds to the distance from joint B to joint C, and the distance from joint A to joint B corresponds to the distance from joint D to joint C. corresponds.
• the transmission has two connection points E 'and F'.
• the connection point E ' is located on the first arm 26 of the second link 24 and it is assigned a swivel joint E which connects the gearbox to the drill mount 10.
• the connection point F ' is located on the first arm 32 of the third link 30.
• the drive of the four-link transmission described above is formed by a pressure cylinder 38.
• the latter is articulated in the transmission with its first end to the frame 18 and articulated with its second end to the second arm 34 of the third link 30.
• the piston rod 40 of the pressure cylinder 38 is retracted.
• the piston rod 40 of the pressure cylinder 38 is extended.
• the extension of the piston rod 40 caused the third link 30 to rotate about the joint B.
• This rotary movement was transmitted to the second link 24 via the fourth link 36. Due to the above-described arrangement of joints A, B, C and D on the corner points of a parallelogram, the angle of rotation of second link 24 around joint A corresponds exactly to the angle of rotation of third link 30 around joint B.
• a tilting device 42 is connected to the first arm 32 of the third link 30 via a connection joint F at the connection point F ′, and is connected to the drill mount 10 via a support joint G.
• the distance from the joint A to the support joint E corresponds to the distance from the joint B to the connection joint F, as a result of which a drive pulse of the first pressure cylinder 38 generates a positively guided displacement of the support joint E and the connection joint F relative to the frame 18, so that an imaginary connecting line runs through the two connection points E 'and F' remain parallel to themselves during this displacement. It follows from this that the drill carriage 10 can also be raised and lowered parallel to itself by the pressure cylinder 38.
• the height of the drilling axis can thus be determined without changing the inclination of the drilling mount 10 and thus the inclination of the drilling axis. It should be emphasized in particular that the above-described transmission is extremely compact in construction and at the same time introduces forces in the longitudinal direction of the drilling mount 10 relatively rigidly into the support structure 14.
• the tilting device 42 is designed such that the distance between the connecting joint F and the supporting joint G is adjustable.
• it comprises, for example, two-part scissors 44 with a hinge H.
• a pressure cylinder 50 is articulated on the one hand to the first link 46 and on the other hand articulated to the second link 48 of the scissors 44 and thus enables opening and closing of the scissors 44 to increase and decrease the distance between joint F and joint G.
• the pressure cylinder 50 could of course also be connected directly, ie without scissors 44, via a connecting joint F to the first arm 32 of the third link 30 and via a supporting joint G to the drill mount 10.
• the pressure cylinder 50 can, however, be mechanically integrated into the suspension device 12 in a much cheaper manner. Comparing FIG. 2 with FIG.
• FIGS. 4 and 5 An advantageous embodiment of the two pressure cylinders 38 and 50 is described with reference to FIGS. 4 and 5.
• It is a pressure cylinder 100 with a main piston 104 which is fitted into a cylinder chamber 102 and whose stroke in the cylinder chamber 102 can be adjusted by means of a built-on stroke limitation device.
• the latter comprises an auxiliary piston 106 with a piston extension 108 which is inserted into the cylinder chamber 102 in a sealed manner.
• the auxiliary piston 106 seals a pressure chamber 110 which can be acted upon by a pressure medium.
• a nozzle 112 is sealed out of the pressure chamber 110 and has a thread 114 with two screwed nuts 116 and 118.
• the pressure chamber 110 is depressurized.
• the main piston 104 abuts the piston shoulder 108 and can push the latter back against a bracket 120 until the nut 116 stops. It can be seen that in this position the piston shoulder 108 protrudes only slightly into the cylinder chamber 102, so that the stroke of the main piston corresponds to the entire length of the cylinder chamber 102.
• the pressure chamber 110 is subjected to the same pressure as the rear part of the cylinder chamber 102.
• the piston shoulder 108 now projects substantially into the cylinder chamber 102 and limits the stroke of the main piston 104.
• the main piston 104 can Do not push the piston neck 108 back.
• the second nut 118 makes it possible to limit the depth of penetration of the piston shoulder 108 into the cylinder chamber 102.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Metallurgy (AREA)
• Manufacturing & Machinery (AREA)
• General Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Organic Chemistry (AREA)
• Earth Drilling (AREA)
• Drilling And Boring (AREA)
• Unwinding Webs (AREA)
• Photoreceptors In Electrophotography (AREA)
• Vending Machines For Individual Products (AREA)
• Drilling Tools (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=19731656

Family Applications (1)

Country Status (9)

Families Citing this family (4)

Family Cites Families (11)

• 1997
  • 1997-01-29 LU LU90015A patent/LU90015B1/de active
• 1998
  • 1998-01-15 AU AU62098/98A patent/AU6209898A/en not_active Abandoned
  • 1998-01-15 DE DE59801316T patent/DE59801316D1/de not_active Expired - Lifetime
  • 1998-01-15 WO PCT/EP1998/000196 patent/WO1998032881A1/fr active IP Right Grant
  • 1998-01-15 US US09/355,591 patent/US6269890B1/en not_active Expired - Fee Related
  • 1998-01-15 CZ CZ19992638A patent/CZ288900B6/cs not_active IP Right Cessation
  • 1998-01-15 AT AT98904073T patent/ATE204912T1/de active
  • 1998-01-15 EP EP98904073A patent/EP0970252B1/fr not_active Expired - Lifetime
  • 1998-01-17 TW TW087100594A patent/TW387015B/zh not_active IP Right Cessation

Non-Patent Citations (1)

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