EP0443126B1 - Apparatus for exchanging tuyere in shaft furnaces - Google Patents

Apparatus for exchanging tuyere in shaft furnaces Download PDF

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Publication number
EP0443126B1
EP0443126B1 EP90123485A EP90123485A EP0443126B1 EP 0443126 B1 EP0443126 B1 EP 0443126B1 EP 90123485 A EP90123485 A EP 90123485A EP 90123485 A EP90123485 A EP 90123485A EP 0443126 B1 EP0443126 B1 EP 0443126B1
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EP
European Patent Office
Prior art keywords
piston
actuator
sleeve
rod
tymp
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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.)
Expired - Lifetime
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EP90123485A
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German (de)
French (fr)
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EP0443126A1 (en
Inventor
Pierre Mailliet
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Paul Wurth SA
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Paul Wurth SA
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C21B7/166—Tuyere replacement apparatus

Definitions

  • the present invention relates to a device for mounting or dismounting nozzles or tympanums of a shaft furnace comprising a jack mounted on a mobile support and capable of bearing on the wall of the furnace, and a gripping member provided with a first element and a second element movable relative to each other in the axis of the nozzle or the tympe.
  • a device of this kind is for example known from document DE-A-25 30 180.
  • said first and said second element of the gripping member are coupled by means of a spring clamping mechanism which, by means of a crank, allows to tighten elastically the nozzle between these two mobile elements.
  • This device comprises pneumatic cylinders which are supplied by a source of air under intermittent pressure. With the aid of a rod provided with a hammer head, these impact cylinders strike on said first element in order to release the nozzle from its conical seat in the tympe. The extraction of the nozzle is then carried out by a retraction of the mobile support. The assembly of a new nozzle is carried out by simple advancement of the movable support in the axis of the tympe.
  • the purpose of the present invention is to provide a device for mounting or dismounting nozzles or drums of a shaft furnace, more sophisticated and more efficient, suitable for all forms of hoses and drums.
  • a device characterized in that said cylinder is a hydraulic cylinder which can be arranged in the axis of the nozzle or the tympe and which is able to move said gripping member axially in two directions.
  • the hydraulic piston of this jack consists of two pistons which are axially movable relative to each other in a common cylinder, the first of the two pistons being connected to the first movable element of the member gripping, the second piston being connected to the second movable element of the gripping member, and in that the jack can be hydraulically supplied so that said first piston can exert traction in the direction of extraction of the nozzle or tympe on said first movable member and that said second piston can simultaneously exert a thrust in the opposite direction on said second movable member, in order to be able to axially clamp the nozzle or tympe between said first movable member and said second movable member.
  • the towed element preferably comprises a cylindrical rod, of section smaller than the smallest passage section of the nozzle and passing axially, right through, the actuator.
  • This rod is fixed to a first coaxial sheath sealingly passing through the rear face of the jack and comprises, inside the jack, said traction piston.
  • This rod may include, at its end, on the furnace side, a notch forming a hook to grip the inner edge of the nozzle.
  • the propelled element of the clamp is preferably constituted by a second sheath, coaxial, around said rod and partially around the first sheath and passing through, sealingly, the front face of the jack, this sheath comprising, at the inside the jack, said thrust piston.
  • a cylindrical extension can be provided to be fixed on the free end of said second sheath to bear on the outside of the nozzle.
  • the hydraulic cylinder support preferably includes means for modifying the inclination of the cylinder relative to the horizontal.
  • a hook for hooking the latter to the clamp, which is designed to be fixed on the propelled element of the clamp and to be actuated by the towed element.
  • This grapple preferably comprises three pairs of converging legs which can be engaged in the tymp, three claws housed respectively between each of the three pairs of legs and distributed regularly, at 120 °, around the towed element.
  • These claws bear, by their end on the jack side, on a front flange fixed on the propelled element and are, by the opposite end, deployable and retractable radially, respectively to a closed position and an open position, under the action of 'an axial displacement of the towed element.
  • the deployment of the three claws can be ensured by three curved spring blades, provided on a sleeve fixed on the towed element, while the retraction of the claws against the action of the blades spring can be produced by cams provided on said sleeve and associated with oblique ramps on the claws, under the action of an axial displacement of the towed element.
  • each claw is preferably axially displaceable between stops provided on the corresponding tabs.
  • the first embodiment of the device according to the present invention is illustrated by Figures 1 to 6 and shown in relation to the implementation for the extraction of a nozzle 20 wedged in a tympe 22, maintained, in turn, in the chapel 24 of the wall 26 of the tank furnace.
  • the device essentially comprises a hydraulic cylinder 28 with double piston for actuating a clamp 30 with telescopic elements.
  • This clamp 30 comprises a towed element 32 consisting of a long cylindrical rod 32 and a pushed or propelled element 34.
  • the rod 32 passes axially, right through, the hydraulic cylinder 28 and its rear end is integral with a first sheath 36 arranged coaxially around the rear part of the rod 32 and housed in a sealed manner in the rear face of the cylinder 28.
  • This sheath 36 is designed, inside the jack 28, in the form of a hydraulic piston 38 acting on the rod 32.
  • the propelled element 34 is designed in the form of a second cylindrical sheath 40 arranged coaxially around the rod 32 and around the front part of the first sheath 36.
  • This second sheath 40 is sealed in the front face of the jack 28 and forms, inside the latter a propelled hydraulic piston 42. Thanks to this design of the hydraulic cylinder, several embodiments of which will be described below, it is possible to actuate the two elements 32 and 34 of the clamp 30, either separately from one another, or in a block.
  • the propelled element 34 of the clamp 30 can be extended by a cylindrical extension 44 extending around the rod 32 and intended to bear on the external face of the nozzle 20.
  • the rod 32 for its part, is provided, at its free end, an oblique notch 46 forming a hook which can be engaged around the inner edge of the nozzle 20.
  • the nozzles are generally arranged so as to inject the hot wind down into the oven, which means that, as shown in the figures, the nozzles are arranged so at this that their longitudinal axis forms an angle, of the order of 5 ° with the horizontal.
  • the device which is mounted on a movable carriage not shown, is brought towards the nozzle concerned and is inclined, so that the axis of the rod 32 is in the extension of the axis of the nozzle 20, this thanks to a support 48 shown diagrammatically, without details, in FIG. 3, making it possible, in a manner known per se, to modify the inclination of the jack 28 and of the clamp 30.
  • the device is then moved in the direction of the axis of the nozzle 20, to make the rod 32 penetrate therethrough, as shown in FIG. 1, the end of the rod 32 being preferably pointed to promote its penetration into the nozzle 20.
  • the actuator 28 can be straightened to occupy a horizontal position axially aligned on the tympe 22 and the chapel 24.
  • the hydraulic pressure between the two pistons 38 and 42 is maintained while the chamber, at the rear of the piston 38 around the sheath 36 is decompressed so that the hydraulic pressure of the jack acting on the piston 38 is transformed into traction on the rod 32.
  • the actuator 28 it is preferable to provide the actuator 28 with a console 50 bearing on the chapel 24.
  • the console 50 since during the forced installation of the nozzle (or tympe) feedback occurs in the opposite direction, it is best to design the console 50 so that it can also be hung on the chapel.
  • the traction on the rod 32 first releases the nozzle 20 from its seat inside the tympe 22 as shown in FIG. 5 and extracts it through the latter until the end of the stroke of the traction piston 38 From this position, illustrated in FIG. 5, the nozzle 20 can be released completely by the backward movement of the carriage, not shown, on which the device is mounted.
  • the installation of a new nozzle 20 comprises the same operational phases, as described above, but, of course, in reverse order.
  • the extension 44 used for dismantling the nozzle 20 is replaced by a grapple 60, illustrated in FIGS. 7 to 8, which is fixed on the free end of the propelled element 34 and which makes it possible to grasp and support the tympe 22.
  • the embodiment illustrated in Figures 7 and 8 differs from the embodiment of the figures previous by the presence of a hammer hammer 62, with compressed air.
  • a hammer hammer 62 which is known per se, can be fixed, outside the jack 28 on the first sheath 36, while the rod 32 is extended to the inside of the hammer 62 where it is actuated directly by this one.
  • the purpose of this striker 62 is to assist the jack 28 in the initial phase of disengaging the tymp 22 with a view to releasing the latter from its seat. It is of course possible to use the device of FIG. 7 with a striker 62 for the release of the nozzle 20 after replacing the grapple 60 by the extension 44.
  • the grab 60 is formed by a support made up of three pairs of legs 62, 64, fixed in a star on a flange 66 attached to the end of the propelled element 34 of the clamp 30. These three pairs of legs extend axially around the rod 32 and converge slightly towards the end of the latter, in accordance with the frustoconical shape of the tymp 22. These lugs 62, 64, are, moreover, encircled by a collar 68 to ensure their rigidity and for lean on the outer edge of the tympe 22 (see also figure 7-D).
  • the grapple 60 also comprises three claws 70 provided respectively between each of the three pairs of legs 62, 64 and designed in the form of elongated flat levers, one end of which bears on the flange 66 and the opposite end of which is designed in the form hook 72 which, in the closed position of the grapple 60, as shown in FIG. 7, is hooked behind the inner edge of the tympe 22. In this position, the tympe is, therefore, held between the collar 68 and the three hooks 72 of the three clips 70.
  • FIG. 7 The comparison of Figures 7c and 7d shows that the outer part of the claws, on the side of the flange 66, is relatively narrow, while the inner part, on the opposite side, is thicker.
  • the transition between the narrow part and the wider part of each of the claws 70 is formed by at least one, preferably two, oblique ramps 74 on either side of each of the claws 70 (see FIG. 7).
  • Each of the three claws 70 also comprises two lateral pins 76, 78 intended respectively to cooperate with stops 80, 82 provided on the corresponding opposite internal faces of the tabs 62, 64.
  • the claws 70 of the grapple 60 are maneuvered using a hollow part engaged on the end of the rod 32 and constituted by a cylindrical sleeve 84 secured to a flange 86. This part is held in place at the '' using a key 88 engaged through a diametrical opening of the rod 32 and corresponding openings in two ears 90, 92 extending from the flange 86 parallel to the rod 32 in the direction of the end thereof (see Figure 7a and 7b).
  • cylindrical sleeve 84 On the cylindrical sleeve 84 are three longitudinal grooves 94 extending radially outwards and regularly distributed at 120 ° around the sleeve 84 to correspond respectively to each of the pairs of legs 62, 64 and to contain each of the three claws 70 respectively.
  • cams 96 On the inner sides of the three grooves 94 are cams 96 (see FIG. 7) intended to cooperate with the oblique ramps 74 of each of the claws 70.
  • blades of spring 98 In each of the three grooves 94, there are, moreover, blades of spring 98 (see FIG. 7 and 7c) provided on the sleeve 84 and the elasticity of which tends to bulge them as shown in FIG. 7.
  • the operation of the grapple 60 is achieved by deployment or radial retraction of the inner ends of each of the claws 70, this maneuver being caused by the axial displacement of the rod 32 under the action of the jack 28 and the operation of which is as follows: to release the tympe 22 from the closed position of the clamp 30 and the grapple 60, the rod 32 is moved to the right in FIG. 7, the element 34 remaining in place. When the rod 32 is moved in this way, the flange 86 first releases the inner end of each of the three claws 70, while the cams 96 approach the ramps 74 of the claws.
  • Each of these chambers 100 and 102 is connected to a line 104, respectively 106, of hydraulic fluid, these lines being designated by P when the line is connected to the hydraulic pump and by T when it is connected to the reservoir, that is to say that she is not under pressure.
  • the piston 42 subsequently designated as the pushing piston, evolves in the chamber 102.
  • the pushing piston 42 has a section smaller than the section of the chamber 102, and does not evolve in leaktight fashion. in this one.
  • the pushing piston 42 can slide, in a sealed manner, on the sheath 36 of which the pulling piston 38 is integral.
  • the device For the disassembly of the tympe 22, the device is brought into the position of FIG. 8, the clamp 30 being in the open position, that is to say that the claws 70 are retracted.
  • the penetration of the clamp 30 to through the tympe 22 is produced under the action of the hydraulic cylinder 28.
  • the first chamber 100 is pressurized by the pipe P while the second chamber 102 is depressurized through T. Consequently, the piston 38 is propelled to the right in FIG. 9 by driving the piston 42, which means that the two elements 32 and 34 advance as a unit to the right in FIG. 8, but that their mutual position does not change.
  • This movement is continued up to the position in FIG. 8, which corresponds, for example, to the position of the pistons 38 and 42 in FIG. 9.
  • the piston 42 as for it suffers for the same reasons, that is to say the fact that its surface exposed on the left is larger than that exposed on the right, a differential force to the right, but since the grapple 60 is wedged by the collar 68 on the tympe 22 and the element 34 of the clamp 30 cannot move in this direction, the thrust piston 42 remains in place despite the differential force which it undergoes.
  • the chamber 100 is depressurized by connecting the pipe 104 to T (see FIG. 11).
  • the piston 38 is therefore subjected to the full pressure of the chamber 102 so that it is forced back to the left into the position of Figure 12.
  • the piston 42 must, of course, follow the movement of the piston 38 under the effect of the traction exerted on the clamp 30 by the rod 32, this despite the fact that it is exposed to a differential force to the right, a force which also keeps the clamp closed.
  • the actuator is kept in abutment on the chapel by means of the console 50 shown in FIG. 4 and not shown in FIGS. 7 and 8.
  • FIG. 12 illustrates the end of the actuation of the actuator 28 during of the tympe disassembly phase 22.
  • the operation of the jack 28, during disassembly of a nozzle 20, is comparable to what has been described above ( Figures 1-5).
  • Figure 13 illustrates the operation of the cylinder 28 during the establishment of a nozzle or a tympe wedged in the closed clamp 30.
  • the chamber 100 is put under hydraulic pressure by connecting the pipe 104 to P in order to push back the piston 38 as well as the rod 32 to the right in FIG. 13.
  • the chamber 102 it is not possible to connect the chamber 102 to T, because the piston 42 must undergo a certain pressure to the right so that the clamp remains closed.
  • It is also not possible to connect the chamber 102 to P because the piston 38 must be able to be pushed back to the right.
  • the compromise consists in maintaining in the chamber 102 an intermediate pressure by connecting the pipe 106 to a pressure equivalent to a fraction of the pressure P, for example, a third of P.
  • FIG. 14 shows the jack already described with reference to FIGS. 9 to 13, the only difference being the replacement of the numbering of the pipes 104 and 106 by A and B respectively.
  • the upper part of the jack, above the longitudinal axis corresponds to the position illustrated in FIG. 10 while the lower part below the longitudinal axis corresponds to the position of FIG. 9.
  • FIG. 9 illustrates different embodiments of the hydraulic cylinder intended to operate the clamp.
  • FIG. 15 illustrates a second embodiment of a jack 128, whose essential difference with the embodiment of Figure 14 is the fact that the two pistons 138 and 142 have the same diameter and are both guided in a sealed manner in the cylinder of the cylinder 128. These two pistons 138 and 142 can therefore, depending on their position, define between them a third chamber 144 which is connected to the hydraulic circuit by a third pipe C.
  • the clamp 30 is closed by pressurizing the chamber 144 by connecting C on P and by connecting the external chambers A and B with the tank T. The clamp thus closed can be entered with the tympe or the nozzle in chapel 24 by connecting A to P or be taken out of chapel 24 by connecting B with P.
  • the gripper 30 is opened by depressurizing the chamber 144 on T of the tank and by connecting the communications A and B to the hydraulic pressure P.
  • the gripper opened can then be moved to one side or the other depending on whether it is A or B which is connected to the tank pressure T.
  • the pistons 138 and 142 are therefore no longer stressed by differential pressure effects, so that one can be satisfied with lower hydraulic pressures to actuate them.
  • This mode of execution also has the advantage of more maneuverability and easier control.
  • Figures 16 and 17 illustrate two variants of the embodiment of Figure 15 with each time a closing amplitude limiter of the clamp. This means that the clamp cannot close beyond a certain limit, this in particular to prevent accidents when the clamp is not loaded by a nozzle or a tympe.
  • the closing movement limiter of the clamp 30 is formed by the sheaths 136 and 140 which are respectively integral with the pistons 138 and 142.
  • the end of the sheath 136 on the side of the clamp 30 has a projecting edge 136a which evolves into a corresponding internal widening 140a of the sheath 140.
  • the closing movement of the clamp 30 stops, therefore, when the inner edge of the projection 136a is stopped by the corresponding edge of the enlargement 140a, that is to say that the movement reserve indicated by 146 has disappeared.
  • the movement limiter is formed by the pistons 138 and 142.
  • one of the pistons in this case the piston 138
  • the piston 142 is extended in the direction of the piston 138, by a tube 148 which extends through the annular space between the piston 138 and the interior wall of the cylinder of the jack 128 and which, beyond the piston 138 ends in a radial edge forming a circular opening of a diameter less than the outside diameter of the piston 138 so that the latter is stopped in its movement of closing of the clamp 30 by this edge 148a.
  • the piston 138 must, of course, be guided in a sealed manner, inside the tubing 148.
  • FIGS. 16 and 17 have been illustrated with reference to the embodiment of FIG. 15. However, they may as well be provided in the embodiment of FIG. 14.

Abstract

The apparatus comprises a hydraulic ram mounted on a movable support designed to be placed in line with the axis of the tuyere or tymp so as to bear on the furnace wall and to act on a gripper composed of two telescopic members respectively displaceable relative to one another in the axial direction of the tuyere or of the tymp in order to ensure the support of the latter, said gripper being axially displaceable through the action of said ram. The hydraulic ram is a double piston ram comprising a traction piston acting on a pulled member of the gripper and a thrust piston acting on a propelled member of the gripper, and is consequently suitable for all forms of tuyeres and tymps.

Description

La présente invention concerne un dispositif de montage ou de démontage de tuyères ou de tympes d'un four à cuve comprenant un vérin monté sur un support mobile et apte à prendre appui sur la paroi du four, et un organe de préhension muni d'un premier élément et d'un deuxième élément mobiles l'un par rapport à l'autre dans l'axe de la tuyère ou de la tympe.The present invention relates to a device for mounting or dismounting nozzles or tympanums of a shaft furnace comprising a jack mounted on a mobile support and capable of bearing on the wall of the furnace, and a gripping member provided with a first element and a second element movable relative to each other in the axis of the nozzle or the tympe.

Un dispositif de ce genre est par exemple connu du document DE-A-25 30 180. Dans ce dispositif ledit premier et ledit deuxième élément de l'organe de préhension sont accouplés à l'aide d'un mécanisme de serrage à ressort qui, par l'intermédiaire d'une manivelle, permet de serrer élastiquement la tuyère entre ces deux éléments mobiles. Ce dispositif comprend des vérins pneumatiques qui sont alimentés par une source d'air sous pression intermittente. A l'aide d'une tige munie d'une tête de marteau ces vérins percuteurs frappent sur ledit premier élément afin de libérer la tuyère de son siège conique dans la tympe. L'extraction de la tuyère est alors réalisée par un recul du support mobile. Le montage d'une nouvelle tuyère s'effectue par simple avancement du support mobile dans l'axe de la tympe.A device of this kind is for example known from document DE-A-25 30 180. In this device, said first and said second element of the gripping member are coupled by means of a spring clamping mechanism which, by means of a crank, allows to tighten elastically the nozzle between these two mobile elements. This device comprises pneumatic cylinders which are supplied by a source of air under intermittent pressure. With the aid of a rod provided with a hammer head, these impact cylinders strike on said first element in order to release the nozzle from its conical seat in the tympe. The extraction of the nozzle is then carried out by a retraction of the mobile support. The assembly of a new nozzle is carried out by simple advancement of the movable support in the axis of the tympe.

Le but de la présente invention est de proposer un dispositif de montage ou de démontage de tuyères ou de tympes d'un four à cuve, plus perfectionné et plus performant, convenant pour toutes les formes de tuyères et de tympes.The purpose of the present invention is to provide a device for mounting or dismounting nozzles or drums of a shaft furnace, more sophisticated and more efficient, suitable for all forms of hoses and drums.

Cet objectif est atteint par un dispositif selon le préambule, caractérisé en ce que ledit vérin est un vérin hydraulique qui peut être agencé dans l'axe de la tuyère ou de la tympe et qui est apte à déplacer axialement ledit organe de préhension dans deux sens opposés pour l'extraction, respectivement le montage, de la tuyère ou de la tympe, en ce que le piston hydraulique de ce vérin se compose de deux pistons qui sont mobiles axialement l'un par rapport à l'autre dans un cylindre commun, le premier des deux pistons étant connecté au premier élément mobile de l'organe de préhension, le deuxième piston étant connecté au deuxième élément mobile de l'organe de préhension, et en ce que le vérin peut être alimenté hydrauliquement de façon que ledit premier piston puisse exercer une traction dans le sens de l'extraction de la tuyère ou de la tympe sur ledit premier élément mobile et que ledit deuxième piston puisse exercer simultanément une poussée dans le sens opposé sur ledit deuxième élément mobile, afin de pouvoir serrer axialement la tuyère ou la tympe entre ledit premier élément mobile et ledit deuxième élément mobile.This objective is achieved by a device according to the preamble, characterized in that said cylinder is a hydraulic cylinder which can be arranged in the axis of the nozzle or the tympe and which is able to move said gripping member axially in two directions. opposites for the extraction, respectively the assembly, of the nozzle or the tympe, in that the hydraulic piston of this jack consists of two pistons which are axially movable relative to each other in a common cylinder, the first of the two pistons being connected to the first movable element of the member gripping, the second piston being connected to the second movable element of the gripping member, and in that the jack can be hydraulically supplied so that said first piston can exert traction in the direction of extraction of the nozzle or tympe on said first movable member and that said second piston can simultaneously exert a thrust in the opposite direction on said second movable member, in order to be able to axially clamp the nozzle or tympe between said first movable member and said second movable member.

L'élément tracté comprend, de préférence, une tige cylindrique, de section inférieure à la plus petite section de passage de la tuyère et traversant axialement, de part en part, le vérin. Cette tige est fixée sur une première gaine coaxiale traversant, de manière étanche, la face arrière du vérin et comporte, à l'intérieur du vérin, ledit piston de traction.The towed element preferably comprises a cylindrical rod, of section smaller than the smallest passage section of the nozzle and passing axially, right through, the actuator. This rod is fixed to a first coaxial sheath sealingly passing through the rear face of the jack and comprises, inside the jack, said traction piston.

Cette tige peut comporter, à son extrémité, côté four, une entaille formant un crochet pour agripper le bord intérieur de la tuyère.This rod may include, at its end, on the furnace side, a notch forming a hook to grip the inner edge of the nozzle.

L'élément propulsé de la pince est, de préférence, constitué par une seconde gaine, coaxiale, autour de ladite tige et partiellement autour de la première gaine et traversant, de manière étanche, la face avant du vérin, cette gaine comportant, à l'intérieur du vérin, ledit piston de poussée.The propelled element of the clamp is preferably constituted by a second sheath, coaxial, around said rod and partially around the first sheath and passing through, sealingly, the front face of the jack, this sheath comprising, at the inside the jack, said thrust piston.

Une rallonge cylindrique peut être prévue pour être fixée sur l'extrémité libre de ladite seconde gaine pour prendre appui sur le côté extérieur de la tuyère.A cylindrical extension can be provided to be fixed on the free end of said second sheath to bear on the outside of the nozzle.

Le support du vérin hydraulique comporte, de préférence, des moyens pour modifier l'inclinaison du vérin par rapport à l'horizontale.The hydraulic cylinder support preferably includes means for modifying the inclination of the cylinder relative to the horizontal.

En vue de la manipulation de la tympe, il est prévu un grappin d'accrochage de celle-ci à la pince, qui est conçu pour être fixé sur l'élément propulsé de la pince et être actionné par l'élément tracté.For the manipulation of the tympe, there is provided a hook for hooking the latter to the clamp, which is designed to be fixed on the propelled element of the clamp and to be actuated by the towed element.

Ce grappin comporte, de préférence, trois paires de pattes convergentes pouvant être engagées dans la tympe, trois griffes logées respectivement entre chacune des trois paires de pattes et réparties régulièrement, à 120°, autour de l'élément tracté. Ces griffes prennent appui, par leur extrémité côté vérin, sur un flasque frontal fixé sur l'élément propulsé et sont, par l'extrémité opposée, déployables et rétractables radialement, respectivement vers une position fermée et une position ouverte, sous l'action d'un déplacement axial de l'élément tracté.This grapple preferably comprises three pairs of converging legs which can be engaged in the tymp, three claws housed respectively between each of the three pairs of legs and distributed regularly, at 120 °, around the towed element. These claws bear, by their end on the jack side, on a front flange fixed on the propelled element and are, by the opposite end, deployable and retractable radially, respectively to a closed position and an open position, under the action of 'an axial displacement of the towed element.

Le déploiement des trois griffes peut être assuré par trois lames de ressort bombées, prévues sur un manchon fixé sur l'élément tracté, tandis que la rétractation des griffes contre l'action des lames de ressort peut être réalisée par des cames prévues sur ledit manchon et associées à des rampes obliques sur les griffes, sous l'action d'un déplacement axial de l'élément tracté.The deployment of the three claws can be ensured by three curved spring blades, provided on a sleeve fixed on the towed element, while the retraction of the claws against the action of the blades spring can be produced by cams provided on said sleeve and associated with oblique ramps on the claws, under the action of an axial displacement of the towed element.

En outre, chaque griffe est, de préférence, déplaçable axialement entre des butées prévues sur les pattes correspondantes.In addition, each claw is preferably axially displaceable between stops provided on the corresponding tabs.

Pour faciliter le déblocage aussi bien de la tuyère que de la tympe, il est préférable de prévoir un marteau percuteur à air comprimé fixé sur ladite première gaine et agissant directement sur la tige de l'élément tracté.To facilitate the release of both the nozzle and the tympe, it is preferable to provide a hammer hammer with compressed air fixed on said first sheath and acting directly on the rod of the towed element.

D'autres particularités et caractéristiques ressortiront de la description de plusieurs modes de réalisation préférés, présentés ci-dessous, à titre d'illustration, en référence aux dessins annexés dans lesquels :

  • la figure 1 montre schématiquement une coupe longitudinale d'une version simplifiée du dispositif selon la présente invention en position d'introduction, pour extraire la tuyère ;
  • La figure 2 est une vue analogue représentant le dispositif en position horizontale ;
  • La figure 3 représente une vue analogue du dispositif lorsque le vérin est actionné pour accrocher la tuyère ;
  • La figure 3a représente une section verticale selon le plan de coupe A-A sur la figure 3 ;
  • La figure 4 représente une coupe horizontale suivant le plan B-B sur la figure 3 ;
  • Les figures 5 et 6 représentent deux phases successives de l'extraction de la tuyère ;
  • La figure 7 représente une coupe verticale d'un mode de réalisation préférée avec un dispositif d'accrochage de la tympe ;
  • Les figures 7a, 7b, 7c et 7d représentent respectivement des sections suivant les plans de coupe A-A, B-B, C-C, D-D sur la figure 7 ;
  • La figure 8 représente une vue analogue à celle de la figure 7 en phase de libération de la tympe ;
  • Les figures 9 à 13 illustrent le fonctionnement d'un premier mode de réalisation d'un vérin hydraulique à l'aide de coupes axiales partielles représentant différentes phases opératives ;
  • La figure 14 représente une coupe longitudinale du premier mode de réalisation du vérin hydraulique;
  • La figure 15 représente un second mode de réalisation du vérin hydraulique ;
  • La figure 16 représente une première variante du premier ou second mode de réalisation du vérin hydraulique ;
  • La figure 17 représente une deuxième variante du premier ou second mode de réalisation du vérin hydraulique.
Other particularities and characteristics will emerge from the description of several preferred embodiments, presented below, by way of illustration, with reference to the appended drawings in which:
  • Figure 1 schematically shows a longitudinal section of a simplified version of the device according to the present invention in the insertion position, for extracting the nozzle;
  • Figure 2 is a similar view showing the device in a horizontal position;
  • Figure 3 shows a similar view of the device when the cylinder is actuated to hang the nozzle;
  • Figure 3a shows a vertical section along the section plane AA in Figure 3;
  • Figure 4 shows a horizontal section along the plane BB in Figure 3;
  • Figures 5 and 6 show two successive phases of the extraction of the nozzle;
  • Figure 7 shows a vertical section of a preferred embodiment with a device for hanging the tympe;
  • Figures 7a, 7b, 7c and 7d respectively represent sections along the section planes AA, BB, CC, DD in Figure 7;
  • FIG. 8 represents a view similar to that of FIG. 7 in the tympe release phase;
  • Figures 9 to 13 illustrate the operation of a first embodiment of a hydraulic cylinder using partial axial sections representing different operational phases;
  • Figure 14 shows a longitudinal section of the first embodiment of the hydraulic cylinder;
  • FIG. 15 represents a second embodiment of the hydraulic cylinder;
  • FIG. 16 represents a first variant of the first or second embodiment of the hydraulic cylinder;
  • FIG. 17 represents a second variant of the first or second embodiment of the hydraulic cylinder.

Le premier mode de réalisation du dispositif selon la présente invention est illustré par les figures 1 à 6 et montré en relation avec la mise en oeuvre pour l'extraction d'une tuyère 20 coincée dans une tympe 22, maintenue, à son tour, dans la chapelle 24 de la paroi 26 du four à cuve.The first embodiment of the device according to the present invention is illustrated by Figures 1 to 6 and shown in relation to the implementation for the extraction of a nozzle 20 wedged in a tympe 22, maintained, in turn, in the chapel 24 of the wall 26 of the tank furnace.

Le dispositif comporte essentiellement un vérin hydraulique 28 à double piston pour actionner une pince 30 à éléments télescopiques. Cette pince 30 comporte un élément tracté 32 constitué d'une longue tige cylindrique 32 et un élément poussé ou propulsé 34. La tige 32 traverse axialement, de part en part, le vérin hydraulique 28 et son extrémité arrière est solidaire d'une première gaine 36 disposée coaxialement autour de la partie arrière de la tige 32 et logée de manière étanche dans la face arrière du vérin 28. Cette gaine 36 est conçue, à l'intérieur du vérin 28, sous la forme de piston hydraulique 38 agissant sur la tige 32. L'élément propulsé 34 est conçu sous forme d'une seconde gaine cylindrique 40 disposé coaxialement autour de la tige 32 et autour de la partie antérieure de la première gaine 36. Cette seconde gaine 40 est logée de façon étanche dans la face avant du vérin 28 et forme, à l'intérieur de celui-ci un piston hydraulique propulsé 42. Grâce à cette conception du vérin hydraulique, dont plusieurs modes de réalisation seront décrits par la suite, il est possible d'actionner les deux éléments 32 et 34 de la pince 30, soit séparément l'un par rapport à l'autre, soit en bloc.The device essentially comprises a hydraulic cylinder 28 with double piston for actuating a clamp 30 with telescopic elements. This clamp 30 comprises a towed element 32 consisting of a long cylindrical rod 32 and a pushed or propelled element 34. The rod 32 passes axially, right through, the hydraulic cylinder 28 and its rear end is integral with a first sheath 36 arranged coaxially around the rear part of the rod 32 and housed in a sealed manner in the rear face of the cylinder 28. This sheath 36 is designed, inside the jack 28, in the form of a hydraulic piston 38 acting on the rod 32. The propelled element 34 is designed in the form of a second cylindrical sheath 40 arranged coaxially around the rod 32 and around the front part of the first sheath 36. This second sheath 40 is sealed in the front face of the jack 28 and forms, inside the latter a propelled hydraulic piston 42. Thanks to this design of the hydraulic cylinder, several embodiments of which will be described below, it is possible to actuate the two elements 32 and 34 of the clamp 30, either separately from one another, or in a block.

L'élément propulsé 34 de la pince 30 peut être prolongé par une rallonge cylindrique 44 s'étendant autour de la tige 32 et destiné à prendre appui sur la face extérieure de la tuyère 20. La tige 32, de son côté, est pourvue, à son extrémité libre, d'une entaille oblique 46 formant un crochet pouvant être engagé autour du bord intérieur de la tuyère 20.The propelled element 34 of the clamp 30 can be extended by a cylindrical extension 44 extending around the rod 32 and intended to bear on the external face of the nozzle 20. The rod 32, for its part, is provided, at its free end, an oblique notch 46 forming a hook which can be engaged around the inner edge of the nozzle 20.

On va maintenant décrire, en référence aux figures 1 à 6 les différentes phases de l'extraction et de démontage de la tuyère. Dans ce contexte, il y a lieu de rappeler d'abord que les tuyères sont généralement disposées de manière à injecter le vent chaud vers le bas dans le four, ce qui fait que, comme représenté sur les figures, les tuyères sont disposées de manière à ce que leur axe longitudinal forme un angle, de l'ordre de 5° avec l'horizontale.We will now describe, with reference to Figures 1 to 6 the different phases of the extraction and disassembly of the nozzle. In this context, it should first be remembered that the nozzles are generally arranged so as to inject the hot wind down into the oven, which means that, as shown in the figures, the nozzles are arranged so at this that their longitudinal axis forms an angle, of the order of 5 ° with the horizontal.

En vue du démontage d'une tuyère 20, le dispositif, qui est monté sur un chariot mobile non représenté, est amené vers la tuyère concernée et est incliné, de manière à ce que l'axe de la tige 32 se trouve dans la prolongation de l'axe de la tuyère 20, ceci grâce à un support 48 montré schématiquement, sans détails, sur la figure 3, permettant, de manière connue en soi, de modifier l'inclinaison du vérin 28 et de la pince 30. Le dispositif est ensuite déplacé dans le sens de l'axe de la tuyère 20, pour faire pénétrer la tige 32 à travers celle-ci, comme représentée sur la figure 1, l'extrémité de la tige 32 étant, de préférence, pointue pour favoriser sa pénétration dans la tuyère 20. A partir de la position de la figure 1, le vérin 28 peut être redressé pour occuper une position horizontale axialement alignée sur la tympe 22 et la chapelle 24.With a view to dismantling a nozzle 20, the device, which is mounted on a movable carriage not shown, is brought towards the nozzle concerned and is inclined, so that the axis of the rod 32 is in the extension of the axis of the nozzle 20, this thanks to a support 48 shown diagrammatically, without details, in FIG. 3, making it possible, in a manner known per se, to modify the inclination of the jack 28 and of the clamp 30. The device is then moved in the direction of the axis of the nozzle 20, to make the rod 32 penetrate therethrough, as shown in FIG. 1, the end of the rod 32 being preferably pointed to promote its penetration into the nozzle 20. From the position of FIG. 1, the actuator 28 can be straightened to occupy a horizontal position axially aligned on the tympe 22 and the chapel 24.

Dans la position de la figure 2, le vérin 28 est mis en action, ce qui, compte-tenu de la disposition particulière des pistons 38 et 42, occasionne un mouvement de ceux-ci dans le sens opposé comme illustré par la comparaison des figures 2 et 3. Cette manoeuvre du vérin 28 provoque, par conséquent, l'avance de l'élément propulsé 34 jusqu'au contact de la rallonge 44 avec la surface extérieure de la tuyère 20 et le recul de l'élément tracté 32 de la pince 34 jusqu'au contact de l'entaille 46 avec le bord intérieur de la tuyère 20, celle-ci étant donc accrochée par une surface en forme de croissant 52 de l'entaille 46 comme représenté sur la figure 3a. La tuyère 20 est dès lors maintenue entre les éléments mobiles de la pince 30. A partir de ce moment commence la phase d'extraction de la tuyère 20. A cet effet, la pression hydraulique entre les deux pistons 38 et 42 est maintenue tandis que la chambre, à l'arrière du piston 38 autour de la gaine 36 est décomprimé de sorte que la pression hydraulique du vérin agissant sur le piston 38 est transformée en traction sur la tige 32. Pour contenir la contre-réaction de cette force de traction, il est préférable de munir le vérin 28 d'une console 50 prenant appui sur la chapelle 24. Par contre, étant donné que lors de la mise en place forcée de la tuyère (ou de la tympe) les contre-réactions se produisent dans le sens opposé, il est préférable de concevoir la console 50 de manière à ce qu'elle puisse également être accrochée sur la chapelle.In the position of Figure 2, the cylinder 28 is actuated, which, given the particular arrangement of the pistons 38 and 42, causes movement of the latter in the opposite direction as illustrated by the comparison of the figures 2 and 3. This operation of the actuator 28 consequently causes the propulsion element 34 to advance until the extension 44 contacts the outside surface of the nozzle 20 and the towed element 32 to move backward. clamp 34 until contact of the notch 46 with the inner edge of the nozzle 20, the latter therefore being hooked by a crescent-shaped surface 52 of the notch 46 as shown in FIG. 3a. The nozzle 20 is therefore held between the movable elements of the clamp 30. From this moment begins the extraction phase of the nozzle 20. For this purpose, the hydraulic pressure between the two pistons 38 and 42 is maintained while the chamber, at the rear of the piston 38 around the sheath 36 is decompressed so that the hydraulic pressure of the jack acting on the piston 38 is transformed into traction on the rod 32. To contain the feedback of this tensile force, it is preferable to provide the actuator 28 with a console 50 bearing on the chapel 24. On the other hand, since during the forced installation of the nozzle (or tympe) feedback occurs in the opposite direction, it is best to design the console 50 so that it can also be hung on the chapel.

La traction sur la tige 32 libère d'abord la tuyère 20 de son siège à l'intérieur de la tympe 22 comme représenté sur la figure 5 et l'extrait à travers celle-ci jusqu'en fin de course du piston de traction 38. A partir de cette position, illustrée sur la figure 5, la tuyère 20 peut être dégagée complètement par le recul du chariot, non représenté, sur lequel est monté le dispositif. La mise en place d'une nouvelle tuyère 20 comporte les mêmes phases opératives, telles que décrites ci-dessus, mais, bien entendu, dans l'ordre inverse.The traction on the rod 32 first releases the nozzle 20 from its seat inside the tympe 22 as shown in FIG. 5 and extracts it through the latter until the end of the stroke of the traction piston 38 From this position, illustrated in FIG. 5, the nozzle 20 can be released completely by the backward movement of the carriage, not shown, on which the device is mounted. The installation of a new nozzle 20 comprises the same operational phases, as described above, but, of course, in reverse order.

Avant de mettre en place une nouvelle tuyère 20 il est également possible de démonter la tympe 22. A cet effet, la rallonge 44 utilisée pour le démontage de la tuyère 20 est remplacée par un grappin 60, illustré sur les figures 7 à 8, qui est fixé sur l'extrémité libre de l'élément propulsé 34 et qui permet de saisir et de supporter la tympe 22.Before installing a new nozzle 20 it is also possible to dismantle the tympe 22. For this purpose, the extension 44 used for dismantling the nozzle 20 is replaced by a grapple 60, illustrated in FIGS. 7 to 8, which is fixed on the free end of the propelled element 34 and which makes it possible to grasp and support the tympe 22.

Outre la présence du grappin 60, le mode de réalisation illustré sur les figures 7 et 8 se distingue du mode de réalisation des figures précédentes par la présence d'un marteau percuteur 62, à air comprimé. Un tel marteau percuteur, qui est connu en soi, peut être fixé, à l'extérieur du vérin 28 sur la première gaine 36, alors que la tige 32 est prolongée jusqu'à l'intérieur du marteau 62 où elle est actionnée directement par celui-ci. Le but de ce percuteur 62 est d'assister le vérin 28 dans la phase initiale de dégagement de la tympe 22 en vue de la libération de celle-ci de son siège. Il est bien entendu possible d'utiliser le dispositif de la figure 7 avec un percuteur 62 pour le dégagement de la tuyère 20 après avoir remplacé le grappin 60 par la rallonge 44.In addition to the presence of the grapple 60, the embodiment illustrated in Figures 7 and 8 differs from the embodiment of the figures previous by the presence of a hammer hammer 62, with compressed air. Such a hammer hammer, which is known per se, can be fixed, outside the jack 28 on the first sheath 36, while the rod 32 is extended to the inside of the hammer 62 where it is actuated directly by this one. The purpose of this striker 62 is to assist the jack 28 in the initial phase of disengaging the tymp 22 with a view to releasing the latter from its seat. It is of course possible to use the device of FIG. 7 with a striker 62 for the release of the nozzle 20 after replacing the grapple 60 by the extension 44.

Le grappin 60 est formé d'un support constitué de trois paires de pattes 62, 64, fixées en étoile sur un flasque 66 attaché à l'extrémité de l'élément propulsé 34 de la pince 30. Ces trois paires de pattes s'étendent axialement autour de la tige 32 et convergent légèrement vers l'extrémité de celle-ci, conformément à la forme tronconique de la tympe 22. Ces pattes 62, 64, sont, en outre, encerclées par un collier 68 pour assurer leur rigidité et pour prendre appui sur le bord extérieur de la tympe 22 (voir également figure 7-D).The grab 60 is formed by a support made up of three pairs of legs 62, 64, fixed in a star on a flange 66 attached to the end of the propelled element 34 of the clamp 30. These three pairs of legs extend axially around the rod 32 and converge slightly towards the end of the latter, in accordance with the frustoconical shape of the tymp 22. These lugs 62, 64, are, moreover, encircled by a collar 68 to ensure their rigidity and for lean on the outer edge of the tympe 22 (see also figure 7-D).

Le grappin 60 comporte également trois griffes 70 prévues respectivement entre chacune des trois paires de pattes 62, 64 et conçues sous forme de leviers plats allongés dont l'une des extrémités prend appui sur le flasque 66 et dont l'extrémité opposée est conçue sous forme de crochet 72 qui, en position fermée du grappin 60, comme représenté sur la figure 7, est accroché derrière le bord intérieur de la tympe 22. Dans cette position, la tympe est, par conséquent, maintenue entre le collier 68 et les trois crochets 72 des trois pinces 70.The grapple 60 also comprises three claws 70 provided respectively between each of the three pairs of legs 62, 64 and designed in the form of elongated flat levers, one end of which bears on the flange 66 and the opposite end of which is designed in the form hook 72 which, in the closed position of the grapple 60, as shown in FIG. 7, is hooked behind the inner edge of the tympe 22. In this position, the tympe is, therefore, held between the collar 68 and the three hooks 72 of the three clips 70.

La comparaison des figures 7c et 7d montre que la partie extérieure des griffes, du côté du flasque 66, est relativement étroite, tandis que la partie intérieure, du côté opposé, est plus épaisse. La transition entre la partie étroite et la partie plus large de chacune des griffes 70 est formée par au moins une, de préférence deux, rampes obliques 74 de part et d'autre de chacune des griffes 70 (voir figure 7). Chacune des trois griffes 70 comporte, par ailleurs, deux ergots latéraux 76, 78 destinés respectivement à coopérer avec des butées 80, 82 prévues sur les faces internes opposées correspondantes des pattes 62, 64.The comparison of Figures 7c and 7d shows that the outer part of the claws, on the side of the flange 66, is relatively narrow, while the inner part, on the opposite side, is thicker. The transition between the narrow part and the wider part of each of the claws 70 is formed by at least one, preferably two, oblique ramps 74 on either side of each of the claws 70 (see FIG. 7). Each of the three claws 70 also comprises two lateral pins 76, 78 intended respectively to cooperate with stops 80, 82 provided on the corresponding opposite internal faces of the tabs 62, 64.

La manoeuvre des griffes 70 du grappin 60 est réalisée à l'aide d'une pièce creuse engagée sur l'extrémité de la tige 32 et constituée par un manchon cylindrique 84 solidaire d'un flasque 86. Cette pièce est maintenue en place à l'aide d'une clavette 88 engagée à travers une ouverture diamétrale de la tige 32 et des ouvertures correspondantes dans deux oreilles 90, 92 s'étendant du flasque 86 parallèlement à la tige 32 en direction de l'extrémité de celle-ci (voir figure 7a et 7b).The claws 70 of the grapple 60 are maneuvered using a hollow part engaged on the end of the rod 32 and constituted by a cylindrical sleeve 84 secured to a flange 86. This part is held in place at the '' using a key 88 engaged through a diametrical opening of the rod 32 and corresponding openings in two ears 90, 92 extending from the flange 86 parallel to the rod 32 in the direction of the end thereof (see Figure 7a and 7b).

Sur le manchon cylindrique 84 se trouvent trois rainures longitudinales 94 s'étendant radialement vers l'extérieur et réparties régulièrement à 120° autour du manchon 84 pour correspondre respectivement à chacune des paires de pattes 62, 64 et contenir respectivement chacune des trois griffes 70. Sur les flancs intérieurs des trois rainures 94 se trouvent des cames 96 (voir figure 7) destinées à coopérer avec les rampes obliques 74 de chacune des griffes 70. Dans chacune des trois rainures 94, se trouvent, par ailleurs, des lames de ressort 98 (voir figure 7 et 7c) prévues sur le manchon 84 et dont l'élasticité tend à les bomber comme représenté sur la figure 7.On the cylindrical sleeve 84 are three longitudinal grooves 94 extending radially outwards and regularly distributed at 120 ° around the sleeve 84 to correspond respectively to each of the pairs of legs 62, 64 and to contain each of the three claws 70 respectively. On the inner sides of the three grooves 94 are cams 96 (see FIG. 7) intended to cooperate with the oblique ramps 74 of each of the claws 70. In each of the three grooves 94, there are, moreover, blades of spring 98 (see FIG. 7 and 7c) provided on the sleeve 84 and the elasticity of which tends to bulge them as shown in FIG. 7.

Par comparaison des figures 7 et 8, on note que le fonctionnement du grappin 60 est réalisé par déploiement ou rétraction radiale des extrémités intérieures de chacune des griffes 70, cette manoeuvre étant occasionnée par le déplacement axial de la tige 32 sous l'action du vérin 28 et dont le fonctionnement est le suivant : pour libérer la tympe 22 à partir de la position fermée de la pince 30 et du grappin 60, la tige 32 est déplacée vers la droite sur la figure 7, l'élément 34 restant en place. Lorsque la tige 32 est déplacée de cette manière, le flasque 86 libère d'abord l'extrémité intérieure de chacune des trois griffes 70, tandis que les cames 96 se rapprochent des rampes 74 des griffes. A partir du moment où les cames 96 entrent en contact avec les rampes 74, les griffes 70 qui ne sont pas fixées, ni dans le sens longitudinal, ni dans le sens radial, au support du grappin, sont entraînées également vers la droite jusqu'à ce que les ergots 76, 78 sur les griffes 70 soient arrêtées par les butées 80, 82 sur les pattes 62, 64. Cette translation axiale des griffes 72 suffit pour les dégager axialement de la face intérieure de la tympe 22. La poursuite du mouvement de la tige 32 vers la droite sur la figure 7 fait agir les cames 96 sur les rampes inclinées 74, étant donné que les griffes 70 sont désormais arrêtées par les butées 80, 82. Ceci provoque, comme le montre la figure 8, la rétraction radiale de chacune des griffes 70 contre l'action des lames de ressort 98 qui aplatissent et s'effacent devant la force des cames 96 sur les rampes obliques 74. Lorsque les griffes 70 sont complètement rétractées et occupent la position de la figure 8, la pince 30 et le grappin 60 peuvent être extraits axialement à travers la tympe 22 en déplaçant d'abord l'élément 34 sous l'action du vérin 28 sur la gauche et ensuite le vérin 28 avec la pince 30.By comparison of FIGS. 7 and 8, it is noted that the operation of the grapple 60 is achieved by deployment or radial retraction of the inner ends of each of the claws 70, this maneuver being caused by the axial displacement of the rod 32 under the action of the jack 28 and the operation of which is as follows: to release the tympe 22 from the closed position of the clamp 30 and the grapple 60, the rod 32 is moved to the right in FIG. 7, the element 34 remaining in place. When the rod 32 is moved in this way, the flange 86 first releases the inner end of each of the three claws 70, while the cams 96 approach the ramps 74 of the claws. From the moment the cams 96 come into contact with the ramps 74, the claws 70 which are not fixed, neither in the longitudinal direction, nor in the radial direction, to the grab support, are also driven to the right up to that the pins 76, 78 on the claws 70 are stopped by the stops 80, 82 on the legs 62, 64. This axial translation of the claws 72 is sufficient to disengage them axially from the inner face of the tymp 22. The pursuit of the movement of the rod 32 to the right in FIG. 7 causes the cams 96 to act on the inclined ramps 74, since the claws 70 are now stopped by the stops 80, 82. This causes, as shown in FIG. 8, the radial retraction of each of the claws 70 against the action of the spring blades 98 which flatten and fade in front of the force of the cams 96 on the oblique ramps 74. When the claws 70 are fully retracted and occupy the position of the FIG. 8, the clamp 30 and the grapple 60 can be extracted axially through the tympe 22 by first moving the element 34 under the action of the jack 28 on the left and then the jack 28 with the clamp 30.

Le démontage d'une tympe comporte les mêmes séquences que la mise en place d'une tympe, mais dans l'ordre inverse. Toutefois, le démontage sera décrit ci-dessous plus en détail en référence aux figures 7 et 8 et avec l'appui des figures 9 à 13 montrant schématiquement des vues partielles du vérin pour expliquer le fonctionnement du mode de réalisation du vérin illustré sur les figures précédentes. Comme représenté sur la figure 9, le piston 38 défini pour les besoins de la description par piston de traction, coulisse, de manière étanche, à l'intérieur du vérin 28 où il définit deux chambres annulaires 100 et 102. Chacune de ces chambres 100 et 102 est raccordée à une conduite 104, respectivement 106, de liquide hydraulique, ces conduites étant désignées par P lorsque la conduite est branchée sur la pompe hydraulique et par T lorsqu'elle est branchée sur le réservoir, c'est-à-dire qu'elle n'est pas sous pression. Le piston 42, désigné par la suite comme piston de poussée évolue dans la chambre 102. Contrairement au piston de traction 38, le piston de poussée 42 a une section inférieure à la section de la chambre 102, et n'évolue pas de manière étanche dans celle-ci. Par contre, le piston de poussée 42 peut glisser, de manière étanche, sur la gaine 36 dont est solidaire le piston de traction 38.The dismantling of a tympe involves the same sequences as the installation of a tympe, but in reverse order. However, the disassembly will be described below in more detail with reference to Figures 7 and 8 and with the support of Figures 9 to 13 schematically showing partial views of the cylinder to explain the operation of the embodiment of the cylinder illustrated in the figures previous. As shown in FIG. 9, the piston 38 defined for the purposes of the description by traction piston, slides, in leaktight manner, inside the jack 28 where it defines two annular chambers 100 and 102. Each of these chambers 100 and 102 is connected to a line 104, respectively 106, of hydraulic fluid, these lines being designated by P when the line is connected to the hydraulic pump and by T when it is connected to the reservoir, that is to say that she is not under pressure. The piston 42, subsequently designated as the pushing piston, evolves in the chamber 102. Unlike the pulling piston 38, the pushing piston 42 has a section smaller than the section of the chamber 102, and does not evolve in leaktight fashion. in this one. On the other hand, the pushing piston 42 can slide, in a sealed manner, on the sheath 36 of which the pulling piston 38 is integral.

En vue du démontage de la tympe 22, le dispositif est amené dans la position de la figure 8, la pince 30 étant en position ouverte, c'est-à-dire que les griffes 70 sont rétractées. La pénétration de la pince 30 à travers la tympe 22 est réalisée sous l'action du vérin hydraulique 28. A cet effet, la première chambre 100 est mise sous pression par la conduite P alors que la seconde chambre 102 est dépressurisée à travers T. Par conséquent, le piston 38 est propulsé vers la droite sur la figure 9 en entraînant le piston 42, ce qui signifie que les deux éléments 32 et 34 avancent en bloc vers la droite sur la figure 8, mais que leur position mutuelle ne change pas. Ce mouvement est poursuivi jusqu'à la position de la figure 8, ce qui correspond, à titre d'exemple, à la position des pistons 38 et 42 sur la figure 9.For the disassembly of the tympe 22, the device is brought into the position of FIG. 8, the clamp 30 being in the open position, that is to say that the claws 70 are retracted. The penetration of the clamp 30 to through the tympe 22 is produced under the action of the hydraulic cylinder 28. For this purpose, the first chamber 100 is pressurized by the pipe P while the second chamber 102 is depressurized through T. Consequently, the piston 38 is propelled to the right in FIG. 9 by driving the piston 42, which means that the two elements 32 and 34 advance as a unit to the right in FIG. 8, but that their mutual position does not change. This movement is continued up to the position in FIG. 8, which corresponds, for example, to the position of the pistons 38 and 42 in FIG. 9.

Dans cette position, la connexion hydraulique 106 de la seconde chambre 102 est commutée sur la pression P (voir figure 10). La pression du liquide hydraulique est, par conséquent, la même dans les deux chambres 100 et 102 ce qui signifie que le piston 38 est exposé de chaque côté à la même pression. Toutefois, étant donné que sa surface exposée dans la chambre 102 est plus grande que celle exposée à la pression de la chambre 100, ce piston 38 subit une force différentielle qui le déplace vers la gauche sur la figure 9. Le piston 42, quant à lui, subit pour les mêmes raisons, c'est-à-dire du fait que sa surface exposée à gauche est plus grande que celle exposée à droite, une force différentielle vers la droite, mais étant donné que le grappin 60 est calé par le collier 68 sur la tympe 22 et que l'élément 34 de la pince 30 ne peut pas se déplacer dans ce sens, le piston de poussée 42 reste en place malgré la force différentielle qu'il subit.In this position, the hydraulic connection 106 of the second chamber 102 is switched to the pressure P (see FIG. 10). The pressure of the hydraulic fluid is therefore the same in the two chambers 100 and 102 which means that the piston 38 is exposed on each side to the same pressure. However, since its surface exposed in the chamber 102 is greater than that exposed to the pressure of the chamber 100, this piston 38 undergoes a differential force which moves it to the left in FIG. 9. The piston 42, as for it suffers for the same reasons, that is to say the fact that its surface exposed on the left is larger than that exposed on the right, a differential force to the right, but since the grapple 60 is wedged by the collar 68 on the tympe 22 and the element 34 of the clamp 30 cannot move in this direction, the thrust piston 42 remains in place despite the differential force which it undergoes.

Le déplacement du piston 38 occasionne une traction sur la tige 32 qui, de ce fait, se déplace vers la gauche à partir de la position de la figure 8. Ce mouvement provoque le dégagement des cames 96 des rampes obliques 74, des griffes 70, pour libérer celles-ci à l'action des lames de ressort 98. La déformation élastique de ces lames 98 vers la position de la figure 7 et la poursuite du mouvement de la tige 32 provoquent un glissement des griffes 70, sous l'action du flasque 86 vers la gauche, jusque dans la position de la figure 7 dans laquelle la tympe 22 est accrochée entre les griffes 70, d'une part, et le collier 68 d'autre part.The displacement of the piston 38 causes traction on the rod 32 which, therefore, moves to the left from the position of FIG. 8. This movement causes the disengagement of the cams 96 from the oblique ramps 74, claws 70, to release these to the action of the spring blades 98. The elastic deformation of these blades 98 to the position of Figure 7 and the continued movement of the rod 32 cause sliding of the claws 70, under the action of the flange 86 to the left, until in the position of FIG. 7 in which the tympe 22 is hung between the claws 70, on the one hand, and the collar 68 on the other hand.

A partir de ce moment, il est possible d'actionner le percuteur 62 afin de libérer la tympe 22 de son siège sur la chapelle 24. Simultanément, on dépressurise la chambre 100 en connectant la conduite 104 sur T (voir figure 11).From this moment, it is possible to actuate the striker 62 in order to release the tympe 22 from its seat on the chapel 24. Simultaneously, the chamber 100 is depressurized by connecting the pipe 104 to T (see FIG. 11).

Le piston 38 subit dès lors la pleine pression de la chambre 102 de sorte qu'il est refoulé vers la gauche jusque dans la position de la figure 12. Ce qui signifie que la tympe 22 est extraite de la chapelle 24 sous l'action de la traction de la tige 32 et du flasque 86. Le piston 42 doit, bien entendu, suivre le mouvement du piston 38 sous l'effet de la traction exercée sur la pince 30 par la tige 32, ceci malgré le fait qu'il soit exposé à une force différentielle vers la droite, force qui maintient d'ailleurs la pince fermée. Lors de cette phase d'extraction, le vérin est maintenu en appui sur la chapelle grâce à la console 50 représentée sur la figure 4 et non représentée sur les figures 7 et 8. La figure 12 illustre la fin de la manoeuvre du vérin 28 lors de la phase de démontage de la tympe 22. Le fonctionnement du vérin 28, lors du démontage d'une tuyère 20, est comparable à ce qui a été décrit ci-dessus (figures 1-5).The piston 38 is therefore subjected to the full pressure of the chamber 102 so that it is forced back to the left into the position of Figure 12. This means that the tympe 22 is extracted from the chapel 24 under the action of the traction of the rod 32 and of the flange 86. The piston 42 must, of course, follow the movement of the piston 38 under the effect of the traction exerted on the clamp 30 by the rod 32, this despite the fact that it is exposed to a differential force to the right, a force which also keeps the clamp closed. During this extraction phase, the actuator is kept in abutment on the chapel by means of the console 50 shown in FIG. 4 and not shown in FIGS. 7 and 8. FIG. 12 illustrates the end of the actuation of the actuator 28 during of the tympe disassembly phase 22. The operation of the jack 28, during disassembly of a nozzle 20, is comparable to what has been described above (Figures 1-5).

La figure 13 illustre le fonctionnement du vérin 28 lors de la mise en place d'une tuyère ou d'une tympe coincée dans la pince fermée 30. A cet effet, la chambre 100 est mise sous pression hydraulique en connectant la conduite 104 sur P afin de refouler le piston 38 ainsi que la tige 32 vers la droite sur la figure 13. Toutefois, lors de cette phase de mouvement, il n'est pas possible de connecter la chambre 102 sur T, car il faut que le piston 42 subisse une certaine pression vers la droite pour que la pince reste fermée. Il n'est pas non plus possible de connecter la chambre 102 sur P car il faut que le piston 38 puisse être refoulé vers la droite. Le compromis consiste à maintenir dans la chambre 102 une pression intermédiaire en connectant la conduite 106 sur une pression équivalant à une fraction de la pression P, par exemple, un tiers de P.Figure 13 illustrates the operation of the cylinder 28 during the establishment of a nozzle or a tympe wedged in the closed clamp 30. For this purpose, the chamber 100 is put under hydraulic pressure by connecting the pipe 104 to P in order to push back the piston 38 as well as the rod 32 to the right in FIG. 13. However, during this movement phase, it is not possible to connect the chamber 102 to T, because the piston 42 must undergo a certain pressure to the right so that the clamp remains closed. It is also not possible to connect the chamber 102 to P because the piston 38 must be able to be pushed back to the right. The compromise consists in maintaining in the chamber 102 an intermediate pressure by connecting the pipe 106 to a pressure equivalent to a fraction of the pressure P, for example, a third of P.

Les figures 14 à 17 illustrent différents modes d'exécution du vérin hydraulique destiné à manoeuvrer la pince. Chacune de ces figures montre la partie supérieure du vérin en position de fermeture de la pince et la position inférieure en position d'ouverture de la pince. La figure 14 reprend le vérin déjà décrit en référence aux figures 9 à 13, la seule différence étant le remplacement de la numérotation des conduites 104 et 106 par respectivement A et B. Sur cette figure, la partie supérieure du vérin, au-dessus de l'axe longitudinal correspond à la position illustrée sur la figure 10 alors que la partie inférieure en dessous de l'axe longitudinal correspond à la position de la figure 9. La figure 15 illustre un deuxième mode d'exécution d'un vérin 128, dont la différence essentielle avec le mode d'éxécution de la figure 14 est le fait que les deux pistons 138 et 142 ont le même diamètre et sont guidés tous les deux de manière étanche dans le cylindre du vérin 128. Ces deux pistons 138 et 142 peuvent, par conséquent, suivant leur position, définir entre eux une troisième chambre 144 qui est raccordée au circuit hydraulique par une troisième conduite C. La fermeture de la pince 30 est réalisée par la mise sous pression de la chambre 144 en connectant C sur P et en reliant les chambres extérieures A et B avec le réservoir T. La pince ainsi fermée peut être entrée avec la tympe ou la tuyère dans la chapelle 24 en branchant A sur P ou être sortie de la chapelle 24 en branchant B sur P. L'ouverture de la pince 30 est réalisée en dépressurisant la chambre 144 sur T du réservoir et en reliant les communications A et B à la pression hydraulique P. La pince ouverte peut alors être déplacée d'un côté ou de l'autre suivant que c'est A ou B qui est branché sur la pression T du réservoir. Dans ce mode de réalisation, selon la figure 15, les pistons 138 et 142 ne sont donc plus sollicités par des effets de pression différentielle, de sorte que l'on peut se contenter de pressions hydrauliques plus faible pour les actionner. Ce mode d'éxécution a, en outre, l'avantage de plus de possibilités de manoeuvre et d'un contrôle plus facile.Figures 14 to 17 illustrate different embodiments of the hydraulic cylinder intended to operate the clamp. Each of these figures shows the upper part of the jack in the closed position of the clamp and the lower position in the open position of the clamp. FIG. 14 shows the jack already described with reference to FIGS. 9 to 13, the only difference being the replacement of the numbering of the pipes 104 and 106 by A and B respectively. In this figure, the upper part of the jack, above the longitudinal axis corresponds to the position illustrated in FIG. 10 while the lower part below the longitudinal axis corresponds to the position of FIG. 9. FIG. 15 illustrates a second embodiment of a jack 128, whose essential difference with the embodiment of Figure 14 is the fact that the two pistons 138 and 142 have the same diameter and are both guided in a sealed manner in the cylinder of the cylinder 128. These two pistons 138 and 142 can therefore, depending on their position, define between them a third chamber 144 which is connected to the hydraulic circuit by a third pipe C. The clamp 30 is closed by pressurizing the chamber 144 by connecting C on P and by connecting the external chambers A and B with the tank T. The clamp thus closed can be entered with the tympe or the nozzle in chapel 24 by connecting A to P or be taken out of chapel 24 by connecting B with P. The gripper 30 is opened by depressurizing the chamber 144 on T of the tank and by connecting the communications A and B to the hydraulic pressure P. The gripper opened can then be moved to one side or the other depending on whether it is A or B which is connected to the tank pressure T. In this embodiment, according to FIG. 15, the pistons 138 and 142 are therefore no longer stressed by differential pressure effects, so that one can be satisfied with lower hydraulic pressures to actuate them. This mode of execution also has the advantage of more maneuverability and easier control.

Le tableau ci-dessous est un tableau récapitulatif du fonctionnement des vérins des figures 14 et 15 pour tous les mouvements possibles, avec indication du branchement des connexions A, B, ou C soit sur la pression hydraulique P, soit sur la pression T du réservoir. Fig. 14 Fig. 15 1. Pince fermée A : P A : T B : P B : T C : P a. sortie A : T A : T B : P B : P C : P b. entrée A : P A : P B : 1/3 P B : T C : P 2. Pince ouverte A : P A : P B : T B : P C : T a. entrée A : P A : P B : T B : T C : T b. sortie seulement par déplacement de tout le dispositif A : T B : P C : T The table below is a summary table of the operation of the jacks in Figures 14 and 15 for all possible movements, with indication of the connection of connections A, B, or C either on the hydraulic pressure P or on the pressure T of the tank . Fig. 14 Fig. 15 1. Closed clamp A: P A: T B: P B: T C: P at. exit A: T A: T B: P B: P C: P b. Entrance A: P A: P B: 1/3 P B: T C: P 2. Open clamp A: P A: P B: T B: P C: T at. Entrance A: P A: P B: T B: T C: T b. exit only by moving the entire device A: T B: P C: T

Les figures 16 et 17 illustrent deux variantes du mode de réalisation de la figure 15 avec chaque fois un limiteur d'amplitude de fermeture de la pince. Ceci signifie que la pince ne peut pas se fermer au-delà d'une certaine limite, ceci, notamment pour empêcher les accidents lorsque la pince n'est pas chargée par une tuyère ou une tympe.Figures 16 and 17 illustrate two variants of the embodiment of Figure 15 with each time a closing amplitude limiter of the clamp. This means that the clamp cannot close beyond a certain limit, this in particular to prevent accidents when the clamp is not loaded by a nozzle or a tympe.

Dans la variante selon la figure 16, le limiteur de mouvement de fermeture de la pince 30 est formé par les gaines 136 et 140 qui sont respectivement solidaires des pistons 138 et 142. Comme le montre la figure 16, l'extrémité de la gaine 136 du côté de la pince 30 comporte un bord saillant 136a qui évolue dans un élargissement intérieur correspondant 140a de la gaine 140. Le mouvement de fermeture de la pince 30 s'arrête, par conséquent, lorsque le bord intérieur de la saillie 136a est arrêté par le bord correspondant de l'élargissement 140a, c'est-à-dire que la réserve de mouvement indiqué par 146 a disparu.In the variant according to FIG. 16, the closing movement limiter of the clamp 30 is formed by the sheaths 136 and 140 which are respectively integral with the pistons 138 and 142. As shown in FIG. 16, the end of the sheath 136 on the side of the clamp 30 has a projecting edge 136a which evolves into a corresponding internal widening 140a of the sheath 140. The closing movement of the clamp 30 stops, therefore, when the inner edge of the projection 136a is stopped by the corresponding edge of the enlargement 140a, that is to say that the movement reserve indicated by 146 has disappeared.

Dans la variante selon la figure 17, le limiteur de mouvement est formé par les pistons 138 et 142. Selon cette variante, l'un des pistons, en l'occurrence le piston 138, a un diamètre inférieur au diamètre intérieur du cylindre hydraulique, alors que l'autre piston, en l'occurrence le piston 142, est prolongé en direction du piston 138, par une tubulure 148 qui s'étend à travers l'espace annulaire entre le piston 138 et la paroi intérieure du cylindre du vérin 128 et qui, au-delà du piston 138 se termine par un bord radial formant une ouverture circulaire d'un diamètre inférieur au diamètre extérieur du piston 138 de sorte que celui-ci est arrêté dans son mouvement de fermeture de la pince 30 par ce bord 148a. Le piston 138 doit, bien entendu, être guidé de manière étanche, à l'intérieur de la tubulure 148.In the variant according to FIG. 17, the movement limiter is formed by the pistons 138 and 142. According to this variant, one of the pistons, in this case the piston 138, has a diameter less than the inside diameter of the hydraulic cylinder, while the other piston, in this case the piston 142, is extended in the direction of the piston 138, by a tube 148 which extends through the annular space between the piston 138 and the interior wall of the cylinder of the jack 128 and which, beyond the piston 138 ends in a radial edge forming a circular opening of a diameter less than the outside diameter of the piston 138 so that the latter is stopped in its movement of closing of the clamp 30 by this edge 148a. The piston 138 must, of course, be guided in a sealed manner, inside the tubing 148.

Les limiteurs de mouvement des figures 16 et 17 ont été illustrés en référence au mode d'éxécution de la figure 15. Toutefois, ils peuvent aussi bien être prévus sur le mode d'éxécution de la figure 14.The movement limiters of FIGS. 16 and 17 have been illustrated with reference to the embodiment of FIG. 15. However, they may as well be provided in the embodiment of FIG. 14.

Claims (17)

  1. Device for installing or removing tuyères or tymps from a blast furnace comprising
       an actuator (28) mounted on a mobile support (48) and capable of being applied to the wall of the furnace,
       a gripping unit (30, 60) equipped with a first element (46, 86) and a second element (44, 66) which can move with respect to each other along the axis of the tuyère (20) or of the tymp (22),
       characterised
       in that the said actuator (28) is a hydraulic actuator which can be positioned along the axis of the tuyère (20) or of the tymp (22) and which is capable of moving the said gripping unit (30, 60) axially in two opposite directions for the removal or installation, respectively, of the tuyère (20) or of the tymp (22),
       in that the hydraulic piston of this actuator (28) is composed of two pistons (38, 42) which can move axially with respect to each other in a common cylinder, the first (38) of the two pistons being connected to the first mobile element (46, 86) of the gripping unit (30, 60), the second piston (42) being connected to the second mobile element (44, 66) of the gripping unit (30, 60), and
       in that the actuator (28) may be powered hydraulically so that the first piston (38) can exert a tractive force in the direction for removal of the tuyère (20) or of the tymp (22) on the first mobile element (46, 86) and so that the second piston (42) can simultaneously exert a thrust in the opposite direction on the second mobile element (44,66), in order to be able to grip the tuyère (20) or the tymp (22) axially between the said first mobile element (46, 86) and the said second mobile element (44, 66).
  2. Device according to Claim 1, characterised
       in that the said first piston (38) comprises a rod (32) which is attached to the first mobile element (46, 86) of the gripping unit (30, 60), and
       in that the said second piston (42) comprises a second sleeve (40) coaxial with this rod (32) and attached to the second mobile element (44, 66) of the gripping unit (30, 60).
  3. Device according to Claim 2, characterised
       in that the rod (32) passes axially through the outer cylinder of the actuator (28) and is attached to a first coaxial sleeve (36) passing in a fluid-tight manner through the rear face of the said outer cylinder of the actuator (28), and
       in that the said first coaxial sleeve (36) forms the said first piston (38) inside the said outer sleeve of the actuator (28).
  4. Device according to Claim 2 or 3, characterised in that the said rod (32) incorporates, at the end nearer the furnace, a notch (46) forming a hook for latching on to the inner edge of the tuyère (20).
  5. Device according to Claim 3 or 4, characterised in that the second sleeve (40) attached to the second element (44, 66) of the gripping unit (30, 60) surrounds, over a part of its length, the said first coaxial sleeve (36) attached to the rod (32) so as to pass in a fluid-tight manner through the front face of the outer cylinder of the actuator (28).
  6. Device according to any one of Claims 2 to 5, characterised by a cylindrical extension piece (44) capable of being attached to the free end of the said second sleeve (40) in order to rest on the outer face of the tuyère (20).
  7. Device according to any one of Claims 1 to 6, characterised in that the mobile support (48) of the actuator (28) incorporates means for modifying the inclination of the actuator (28) with respect to the horizontal.
  8. Device according to Claim 1, characterised in that the gripping unit is equipped with a grapple (60) for latching on to the tymp (22).
  9. Device according to Claim 8, characterised in that the said grapple (60) comprises three pairs of convergent lugs (62, 64) spaced 120° apart and capable of becoming engaged with the tymp (22), a coupling member (70) associated with each of the three pairs of lugs (62, 64), the said coupling members (70) resting, by their ends nearer the actuator, on the said second mobile element (66) and being capable, at their opposite ends, of being deployed or retracted radially, respectively to a closed position and an open position, under the action of a relative axial movement of the said first element (86) and of the said second element (66).
  10. Device according to Claim 9, characterised in that the radial deployment of the three coupling members (70) is produced by three curved leaf springs (98) positioned over a sleeve (84) attached to the said first mobile element (86) and
       in that the radial retraction of the three coupling members (70) against the action of the leaf springs (98) is produced by cams (96) positioned over the same sleeve (84), the said cams (96) cooperating with oblique ramps (74) on the coupling members (70) during an axial movement of the said first mobile element (86).
  11. Device according to Claim 10, characterised in that each coupling member (70) can move axially between stops positioned on the corresponding lugs (62, 64).
  12. Device according to any one of Claims 2 to 11, characterised by a compressed-air striking hammer (62) fixed on the said first sleeve (36) and acting directly on the rod (32) of the pulled element.
  13. Device according to any one of Claims 1 to 12, characterised in that the said first piston (38) and the said second piston (42) act differentially and in that the said second piston (42) has a diameter smaller than that of the said first piston (38).
  14. Device according to any one of Claims 1 to 12, characterised in that the said first piston (138) and the said second piston (142) have substantially identical working areas and between them define a hydraulic chamber (144) in the cylinder of the actuator (28).
  15. Device according to either of Claims 13 or 14, characterised in that the actuator (28), (128) incorporates a limiter of the relative movement of the two pistons (38, 42) (138, 142).
  16. Device according to Claim 14, characterised in that the said limiter is formed by corresponding stops (136a, 140a) provided respectively on the first sleeve (136) and the said first sleeve (140).
  17. Device according to Claim 14, characterised in that the said limiter is formed by a cylindrical section of pipe (148), which is attached to one of the pistons and extends beyond the other piston, and which is provided with a projecting edge (148a) forming a stop for the latter piston.
EP90123485A 1990-02-14 1990-12-07 Apparatus for exchanging tuyere in shaft furnaces Expired - Lifetime EP0443126B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU87676 1990-02-14
LU87676A LU87676A1 (en) 1990-02-14 1990-02-14 DEVICE FOR MOUNTING OR DISASSEMBLING NOZZLES OR TYPES OF TANK OVENS

Publications (2)

Publication Number Publication Date
EP0443126A1 EP0443126A1 (en) 1991-08-28
EP0443126B1 true EP0443126B1 (en) 1995-03-08

Family

ID=19731214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90123485A Expired - Lifetime EP0443126B1 (en) 1990-02-14 1990-12-07 Apparatus for exchanging tuyere in shaft furnaces

Country Status (16)

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US (1) US5127633A (en)
EP (1) EP0443126B1 (en)
AT (1) ATE119580T1 (en)
AU (1) AU629437B2 (en)
BR (1) BR9100481A (en)
CA (1) CA2032391C (en)
CS (1) CS32391A2 (en)
DE (1) DE69017655T2 (en)
ES (1) ES2070256T3 (en)
LU (1) LU87676A1 (en)
PL (1) PL165136B1 (en)
RU (1) RU2041958C1 (en)
SK (1) SK281596B6 (en)
TR (1) TR25680A (en)
UA (1) UA26034A1 (en)
ZA (1) ZA91147B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5925312A (en) * 1998-06-17 1999-07-20 China Steel Corporation Push-pull apparatus adapted for assembling and disassembling a tubular body that is to be fitted into a ring retainer on a wall member
KR100432130B1 (en) * 2002-08-22 2004-05-17 주식회사 포스코 Tuyere nozzle intercepter and apparatus for smashing the same
CA2877672C (en) 2011-06-22 2017-09-12 Tube City Ims Corporation Tuyere remover
LU100373B1 (en) 2017-08-18 2019-03-26 Wurth Paul Sa Extraction Device for a Tuyere Part
CN111673673B (en) * 2020-06-29 2024-03-29 广西玉柴机器股份有限公司 Electrical control type pin pulling device
CN116408626A (en) * 2023-03-03 2023-07-11 济南华北升降平台制造有限公司 Mechanical arm for dismounting small sleeve of blast furnace tuyere

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU438646A1 (en) * 1973-01-11 1974-08-05 Предприятие П/Я В-8415 The method of obtaining oxaferfluoroalkenitriles
DE2530180C2 (en) * 1975-07-05 1982-09-30 Igema Kuhlmann Gmbh & Co Kg, 4100 Duisburg Device for changing blow molds in blast furnaces
FR2321543A1 (en) * 1975-08-20 1977-03-18 Usinor Tuyere replacement on blast furnaces - where mobile insertion tool is fitted with ram hammering tuyere into tymp
US4087084A (en) * 1975-10-28 1978-05-02 Louis A. Grant, Inc. Apparatus for changing blast furnace tuyeres
SU678067A1 (en) * 1977-01-05 1979-08-05 Проектно-Конструкторский Технологический Институт Министерства Черной Металлургии Ссср Apparatus for brake-off of air tyueres of blast furnaces
US4143041A (en) * 1977-01-19 1979-03-06 Eli Lilly And Company 4'-Deoxyvincristine and related compounds
SU847436A1 (en) * 1979-07-17 1981-07-15 Локомотивное Депо "Засулаукс" При-Балтийской Ордена Октябрьской Pebo-Люции Железной Дороги Device for charging storage battery from dc source
JPS57110632A (en) * 1980-12-27 1982-07-09 Nippon Kokan Kk <Nkk> Removing method for porous plug of ladie
JPS60121210A (en) * 1983-12-05 1985-06-28 Nippon Steel Corp Nozzle exchanger

Also Published As

Publication number Publication date
ES2070256T3 (en) 1995-06-01
CA2032391A1 (en) 1991-08-15
PL165136B1 (en) 1994-11-30
LU87676A1 (en) 1991-10-08
TR25680A (en) 1993-09-01
DE69017655D1 (en) 1995-04-13
ZA91147B (en) 1991-12-24
DE69017655T2 (en) 1995-08-03
UA26034A1 (en) 1999-02-26
RU2041958C1 (en) 1995-08-20
CS32391A2 (en) 1991-09-15
US5127633A (en) 1992-07-07
SK281596B6 (en) 2001-05-10
ATE119580T1 (en) 1995-03-15
AU629437B2 (en) 1992-10-01
BR9100481A (en) 1991-10-29
CA2032391C (en) 2000-10-03
EP0443126A1 (en) 1991-08-28
PL289051A1 (en) 1992-03-23
AU6813890A (en) 1991-08-15

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