Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B7/00—Blast furnaces
  • C21B7/18—Bell-and-hopper arrangements
  • C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B1/00—Shaft or like vertical or substantially vertical furnaces
  • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
  • F27B1/20—Arrangements of devices for charging
• • 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
  • F27D3/10—Charging directly from hoppers or shoots

Definitions

• the present invention relates to the attachment of a distribution chute of a charging installation of a shaft furnace, such as a blast furnace, on the trunnions supporting the chute and ensuring its pivoting. It relates more particularly to the locking system of the chute on the ends of the trunnions.
• a charging installation of a shaft furnace typically comprises a fixed feed channel disposed vertically in the center of the blast furnace, centered on the vertical axis of the furnace, and a distribution chute for distributing the charged materials in the furnace. arriving by said channel.
• the dispensing chute is rotatable along said vertical and pivoting axis along a horizontal axis.
• the chute is typically pivotally mounted along said horizontal axis in a ferrule mounted coaxially around said feed channel and rotatable along the vertical axis.
• the chute is pivotally mounted in the shell by means of generally cylindrical pins of horizontal axis, on which the chute is secured and which are rotatably mounted along said horizontal axis in integral bearings of the ferrule.
• the rotation of the ferrule and the pivoting of the chute are generally provided by gear means located in an annular chamber surrounding the ferrule.
• the chute is fixed on both sides on the radially inner ends, directed towards the vertical axis of the furnace, journals, which are pivotally driven by means of the gear drive means located in said room surrounding the shell.
• These drive means can act directly on the journals by meshing, or by means of arms or levers.
• the locking pins comprise a cylindrical body slidably mounted and rotating in a bore formed in the trunnion and of axis parallel to that of the trunnion, an eccentric stud 31 formed at the end of the body located towards the trough, and rotational control and rotational locking means, located at the opposite end of the pin body, accessible at the outer end end of the journal which is located in the annular chamber surrounding the ferrule.
• a particular problem is that locking in It must be possible to rotate the pin in different angular positions thereof, because this angular position is determined by the cooperation of the eccentric pin with the hole in the leg of the chute and, because of the dimensional dispersions between the housings of the chute. ends of the trunnions, the legs of the chute, the pins and the holes in which they engage, or also deformations or wear of these elements, said angular position of the pin, adapted to ensure the correct locking of the chute, is variable from one assembly to another, and / or must be adjustable to ensure maintenance without play of the assembly.
• a known embodiment of these locking means consists of an arm secured to the end of the pin, which has at its end a screw and an adjusting nut and locking, which allows locking said arm on the front end of the pin in different positions, thereby immobilizing the pin in the desired position.
• the arm is replaced by a flat tab that can be clamped to the front end of the journal in a plurality of positions.
• a disadvantage of these lock pin locking systems is that they occupy a large part of the front end surface of the pin, while it is also occupied by the connections of cooling ducts formed in the trunnions to cool them, and possibly the chute.
• these connections are more cumbersome because they include rotating joints, necessary to connect the pivoting pins to the fixed ducts for supplying cooling water. It follows that it is necessary to disassemble these rotating joints to have access to the pin locking means, when it is necessary to act on them, especially during the replacements of the chute. Accordingly, particularly when using a pressurized cooling system, it is then necessary to purge the circuit prior to disassembly and then fill it again. Errors can be made then and during the restart of the cooling. In addition, the cooling of the trunnions is stopped during the entire operation of replacing the chute, while the trunnions remain exposed to the intense heat prevailing in the furnace.
• An object of the present invention is to solve the aforementioned problems. It aims in particular to allow the replacement of the chute without requiring disassembly of rotary joints. It also aims to keep the cooling circuit in use during chute change operations. It is particularly intended to reduce the size of the locking means locking pins of the chute, while ensuring, however, both the reliability of this blockage and the possibility of ensuring it in the various angular positions where it can It is necessary to place the pins in order to ensure that the legs of the chute do not play on the trunnions.
• the invention relates to a device for locking the chute on the ends of the trunnions, in a charging installation of a shaft furnace as indicated above, having a distribution trough of material rotatably mounted along a horizontal axis by means of rotating journals in fixed bearings of a supporting ferrule having a vertical axis of rotation, the chute being connected to the journals by upper end tabs of the chute which 'engage in housings arranged on inner ends of the pins and which are blocked by pins housed in the trunnions and axis parallel to the axis of the trunnions, each pin having at its inner end facing the vertical axis a eccentric pin engaging with a leg of the chute to keep the tab locked at the bottom of its housing, and locking means for locking the pin in rotation.
• each pin comprises, at its outer end opposite the stud, adjusting means in rotation and clamping, to be able to press with sufficient effort the stud on the leg of the chute by a rotation of the pin
• the locking means comprise an indexing plate rotatably connected to the end of the pin, the plate further comprising teeth arranged to cooperate with the corresponding teeth of a latch secured to the trunnion, so that said latch can immobilize the pin in rotation in a plurality of circumferential positions of said pin.
• the device of the invention allows easy access to the pin by simply removing the indexing plate, which then allows to rotate the pin to unlock the legs of chute, then pull axially to allow the legs of the chute out of their housing in the trunnions, and thus allow the removal of the chute and its replacement. It suffices for this to be able to access the fixing means of the indexing plate on the external end of the trunnion, which can be done without interfering with the other elements fixed on said front end, such as in particular rotating joints of the cooling circuit.
• the pin is put back in place, turned and tightened to ensure the pressure of the eccentric pin on the leg of the chute, then locked in position by engagement of the teeth of the index plate with those of the lock, as will be specified later.
• the indexing plate is rotatably connected to the pin by means of rotational connection arranged to ensure the connection in rotation according to different relative angular positions.
• the rotational connection means comprise a polygonal shape made on the pin, cooperating with a cut-out adapted form made in the index plate.
• the polygonal shape of the pin is hexagonal and the cutting of the index plate is in the form of a double hexagon. This arrangement therefore makes it possible to adjust the relative angular position between the pin and the indexing plate with a pitch limited to 1/12 turn or 30 degrees of angle.
• the polygonal shape of the pin is extended towards the outer end of the pin to also serve as means for adjusting in rotation and clamping, for example by a polygonal key of the current type.
• the indexing plate is fixed on an outer end of the trunnion, and serves as an axial stop of the pin, thus preventing any risk of removal of the pin by axial sliding in its bore in the trunnion.
• the indexing plate is fixed on the trunnion by bolts passing through the slots of the indexing plate, said slots being in the shape of a circular arc centered on the axis of rotation of the pin.
• These lights allow the attachment of the indexing plate on the trunnion in a plurality of angular positions, limited only by the length of the lights, and thus allows to accurately position and maintain the index plate, and therefore the pin, in the angular position adapted to ensure the clamping of the leg of the chute in its housing.
• the lock preferably comprises a plate having teeth engaging with the teeth of the indexing plate, the teeth of the index plate and the lock plate being arranged according to arcs of circles centered on the axis of rotation of the pin, which allows the locking of the indexing plate regardless of the relative angular positions of the indexing plate and the lock.
• the lock plate is fixed on the outer end of the trunnion by bolts passing through the slots of the wafer, said lights being shaped circular arc centered on the axis of rotation of the pin.
• lateral stop means are provided to limit the stroke of the wafer in the circumferential direction.
• These lateral abutment means preferably comprise a side wall of a housing formed in the external end of the trunnion and in which the lock plate is fixed, said side wall of the housing acting as an abutment for one end of the wafer.
• the ends of the wafer are offset by a half pitch of teeth with respect to the toothing of the wafer.
• This provision allows, by a reversal of the wafer on itself, to be able to lock the pin in rotation with an even finer adjustment of its angular positioning, reduced to an angle value corresponding to the angular value of a half step of the locking teeth.
• the indexing plate is housed in a housing formed on the front end of the journal, the housing having side walls which constitute pivoting stops of the indexing plate, with an angular clearance. sufficient to allow to place the indexing plate in its housing whatever the angular position of the pin.
• the connection between the pin and the indexing plate is provided by a hexagonal shape of the pin and a double hexagon shape of the cutting of the indexing plate in which engages said hexagonal shape of the pin
• the angular clearance between the index plate and the side walls of its housing is 30 degrees. This means that the indexing plate can be placed in its housing in a plurality of angular positions over a 30 degree arc.
• Figure 2 is a general view of the support system and driving pivoting of the chute, seen from the side of the outer end of a trunnion;
• Figure 3 is an axial sectional view of the pin in the radial plane containing the pin
• Figure 4 is a perspective view of the pin equipped with the index plate and with the locking plate;
• Figure 5 is a cross-sectional view along the line V-V of Figure 3;
• Figures 6 and 7 show two alternative positions of the locking plate engaged with the teeth of the index plate.
• the support system and pivoting of the chute shown in Figure 2 comprises, on each side of the chute, a bearing 22 in which the pin 2 is rotatably mounted along a horizontal axis A1, and pivotally driven by a mechanism comprising a gear case 23, an output shaft carries a pinion 24 meshing with a toothed sector 25 of a control arm 26 connected in rotation with the pin.
• rotating joints 28 are connected to connect ducts for internal cooling of the trunnions.
• the end 32 shaped in hexagon, the pin 3 opposite the eccentric pin 31 which cooperates with the tab 1 1 of the chute to block it in its housing 21 , as indicated at the beginning of this memo in relation with FIG. 1, and the means 4 for locking in rotation of the pin 3 on the journal, which particularly comprise an indexing plate 41 and a locking plate 42.
• the pin 3 is rotatably and slidably mounted in a bore of axis A2 of the journal parallel and eccentric by contribution to the axis A1. Its inner end, located towards the chute, comprises the eccentric pin 31 which, in the locked position of the chute, protrudes axially in the housing 21 to engage in the hole provided for this purpose in the tab 1 1 of the chute.
• the pin is shaped according to a hexagon 321 which is engaged with a hole in the form of a double hexagon 41 1 made in the indexing plate 41, and protrudes from this plate so as to be able to place a wrench to turn the pin 3 along its axis A2 and thus rotate the eccentric pin and block the leg of the chute in its housing, as indicated above.
• the indexing plate 41 is housed in a housing 5 formed for this purpose in the outer end of the trunnion, and being fixed to the bottom of this housing, axially blocks the pin to prevent the eccentric pin from emerging from the hole the leg of the chute by axial sliding of the pin.
• the indexing plate 41 comprises two arms 412, 413 extending in substantially diametrically opposite directions, in which oblong slots 414 are formed in centered circular arcs. on the A2 axis of the pin. Fastening bolts 415, passing through these slots and screwed into the trunnion, make it possible to tighten the indexing plate 41 on a front wall 51 constituting the bottom of the housing 5, thereby immobilizing the indexing plate, and thus the pin, in rotation. .
• One of the arms 413 carries at its end a right-angle toothing 416 in the form of an arc of a circle, centered on the axis A2, which engages with a corresponding toothing 421 formed on the locking plate 42.
• the wafer of FIG. lock 42 has an oblong slot 422 in which passes a bolt 423 for fixing the plate in the housing 5 of the pin.
• the locking plate 42 is housed in a portion 52 of the housing 5 having a side wall 53 arranged to abut one of the ends 424, 425 of the wafer 42.
• the housing 5 further comprises two side walls 54, 55 confronting the lateral faces of arms 412 and 413, but arranged so that there remains overall between said arms and said side walls games j1, j2 allowing an overall angular clearance j1 + j2 of the index plate equal to, or slightly greater than, 30 °, necessary to allow to place the plate d indexing 41 in both the housing 5 and the hexagonal end 32 of the pin 2, regardless of the angular position of said pin.
• the ends 424, 425 of the fixing plate are offset by a half-step relative to the toothing, so that by a reversal of the plate, it is can best ensure, and regardless of the angular position of the pin and the index plate, both the engagement of the teeth of the indexing plate and the locking plate, and the stop of the wafer locking against the side wall 53 of its housing.
• the engagement of the teeth, while the locking plate is placed in a first direction would lead to a clearance between the end 424 of the wafer and the side wall 53 as shown in FIG. 6, it is possible to eliminate or at least reduce this game by turning the wafer so that it is then the other end 425 which is located in abutment, without play, against the side wall 53, as shown in FIG.
• the tabs 1 1 thereof are placed in the housing 21 of the support pins 2. Then, on each side, the pin 3 is pushed axially so as to penetrate the eccentric pin 31 into the hole of the lug 1 January. By means of a key engaged on the end 32 of the pin, the pin is rotated until the pin 31 blocks the tab 1 1 in the housing 21. In this position, the indexing plate 41 is adjusted on the hexagon 321 of the end of the pin so that said plate fits into the housing 5 of the front end of the pin with a minimum clearance, and tightening the bolts 415 so as to clamp the indexing plate 41 against the bottom 51 of its housing, thereby immobilizing the pin axially and rotationally.
• the locking plate 42 is then positioned in the direction ensuring a zero or minimum clearance between the end 424 or 425 of the wafer and the wall 53 of its housing, and the bolt 423 holding the wafer is tight. Thanks to the different relative angular positions between the pin and the indexing plate, which can be obtained by engagement of the double hexagonal shape of the indexing plate with the hexagonal shape 321 of the end of the pin, and thanks to the teeth 416, 421 which can engage respectively with an angular pitch corresponding to the pitch of the toothing, and thanks to the possibility of reversal of the locking plate, it can finally ensure a reliable locking and virtually without play of the pin regardless of its angular position. In addition, as already indicated, a triple security exists to prevent the chute from falling, even in the case where the locking plate would disappear and that the bolts of the indexing plate would come to loosen.
• the invention is not limited to the embodiment described above by way of example.
• a hexagonal shape of the end of the pin to allow its rotation by a key one could use any other form adapted to the clamping tool used.
• the hexagonal and double-hexagonal shapes of the connection between the indexing plate and the pin could also be replaced by other polygonal shapes of the same function, for example a square on the pin and a double square in the indexing plate , games j1 and j2 being adapted accordingly.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Blast Furnaces (AREA)
• Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
• Furnace Charging Or Discharging (AREA)
• Clamps And Clips (AREA)
• Muffle Furnaces And Rotary Kilns (AREA)
• Furnace Details (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)
• Pivots And Pivotal Connections (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (12)

Families Citing this family (1)

Family Cites Families (31)

• 2014
  • 2014-07-07 LU LU92494A patent/LU92494B1/xx active
• 2015
  • 2015-07-02 WO PCT/EP2015/065109 patent/WO2016005266A1/fr active Application Filing
  • 2015-07-02 BR BR112016030636-8A patent/BR112016030636B1/pt active IP Right Grant
  • 2015-07-02 US US15/324,317 patent/US9926614B2/en active Active
  • 2015-07-02 UA UAA201700981A patent/UA118598C2/uk unknown
  • 2015-07-02 EA EA201790139A patent/EA031944B1/ru not_active IP Right Cessation
  • 2015-07-02 CN CN201580036126.7A patent/CN106661641B/zh active Active
  • 2015-07-02 CA CA2950674A patent/CA2950674C/en active Active
  • 2015-07-02 KR KR1020167035479A patent/KR102407929B1/ko active IP Right Grant
  • 2015-07-02 JP JP2016572798A patent/JP6517842B2/ja active Active
  • 2015-07-02 EP EP15733745.2A patent/EP3167083B1/de active Active
  • 2015-07-06 TW TW104121814A patent/TWI654403B/zh active

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