JP2005111503A - Hot removal method for deposition in nozzle tuyere of molten metal storage vessel, and hot exchange method for nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method for reducing the time for the exchange operation of a nozzle in a molten metal storage vessel such as a tundish. <P>SOLUTION: In the hot removal device for depositions in a nozzle tuyere of the molten metal storage vessel, a rotary support rotatively supporting a rotary axis is fitted to a supporting base frame with a centering mechanism fitted to a freely elevating base frame in a moving device which moves horizontally, and a striking apparatus composed of a flat tool with a plurality of cutters and a striking mechanism allowing vibration to act in the axial direction thereof are fitted to the tip part of the rotary axis so as to regulate the angle of elevation via a supporting member. The flat tool is located so as to be confronted with the surface of the nozzle tuyere, and the height of the frame and the angle of elevation of the striking apparatus are regulated. Further, the striking apparatus is turned, and strikes are applied in the depth direction and the circumferential direction of the tuyere. Thus, the depositions at the surface of the tuyere are crushed and removed, and thereafter, a nozzle is fitted to the tuyere. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus for maintaining a molten metal storage container such as a tundish or a ladle in a continuous casting facility, and a maintenance method thereof. More specifically, after punching out the tuyere nozzle provided at the bottom of a molten metal storage container such as a tundish or ladle, before attaching a new nozzle to this tuyere, The present invention relates to an apparatus for removing a kimono hot, and a method for replacing a nozzle using the apparatus.

  The tundish for continuous casting of metal is maintained hot after casting is finished, and continuously used for the next casting. In this case, after the remaining hot water or residue remaining in the tundish is discharged to a discharge pan or the like, it is necessary to replace the nozzles at the bottom of the tundish that are severely damaged or clogged with new nozzles.

  In the nozzle replacement operation, first, a nozzle punching operation is required. In other words, an operator from the tundish lid or the deck of the repair shop collides the tip of the nozzle push-out bar with the tip of the extrapolated nozzle from the inner surface of the tundish by human power or mechanical means. Is pushed out of the tundish.

  After that, a new nozzle is set to the tundish nozzle tuyere using joint material such as mortar, but the nozzle and tuyere seize due to the heat effect during casting, and the nozzle wings after the previous nozzle is pulled out The inner surface of the mouth may not be smooth. Therefore, it is essential to clean the inner surface of the nozzle tuyere to remove these deposits before replacing / inserting a new nozzle.

  As a means for this cleaning work, it is provided with a cutter and brush having the same shape as the cylindrical hollow portion of the nozzle tuyere, a rotating mechanism for rotationally driving the cutter and brush, and an air blow nozzle, which are hardened around the nozzle tuyere. A device that scrapes off the mortar (joint material) and the mortar (joint material) eroded at the tip of the tuyere and blows off the powdered mortar (joint material) with an air blow nozzle (see, for example, Patent Document 1) ), Similar to the shape of the tuyere, using a tuyere cleaning device equipped with a device that relatively rotates a plurality of cutters having a diameter smaller than the tuyere diameter, moving the plurality of cutters toward the tuyere, A device that rotates and revolves each cutter to remove mortar and molten steel adhering to the tuyere (see, for example, Patent Document 2), or driven by a breaker, and the inner surface of the nozzle tuyere The hanger tool that hangs the molten steel and mortar, etc., attached to the reciprocating means, the reciprocating means that reciprocates the hanger tool in the same tilt direction as the tuyere's depth direction, and the breaker, hanger tool, and reciprocating means. There is a device for cleaning by revolving in the circumferential direction of the inner surface of the nozzle tuyere (for example, see Patent Document 3), and at least the cleaning unit of the cleaning device for cleaning the inner peripheral surface of the nozzle tuyere brick is raised and lowered A lifting device to be moved, a floating means of the cleaning portion, one positioning portion swingable integrally with the cleaning portion by the floating means, and one positioning portion provided around the outlet of the tundish The other positioning part for positioning the cleaning part of the cleaning device substantially on the center line of the nozzle tuyere brick and the chain for cleaning the inner peripheral surface of the nozzle tuyere brick. And / or tuyere bricks cleaning device having a wire brush (for example, see Patent Document 4) have.

  These devices are said to improve the safety and efficiency of maintenance work under high heat.

JP-A-7-242918 JP 7-256440 A JP-A-8-164474 Japanese Utility Model Publication No. 6-48943

  Regarding the maintenance of nozzles for tundish, which is a molten metal storage container, in recent years, in order to improve production elasticity and improve equipment operation rate, in addition to the problem of extending the life of nozzles, shortening nozzle maintenance time Is required. That is, it is required to minimize the maintenance time, shorten the downtime due to the maintenance work, and maximize the operation rate of the tundish.

  For these reasons, maintenance of these nozzles is frequently performed hot. However, in an apparatus using a cutting tool such as a cutter or a wire brush as disclosed in Patent Documents 1 to 4, the joint material that is seized and fixed to the inner surface of the nozzle tuyere (hereinafter also referred to as the tuyere inner surface or tuyere surface) Since the hardness becomes extremely high, the cutting is insufficient and the efficiency is inferior, and the cutting edge is worn out at an early stage, which is not efficient.

  Further, the chiseling tool using the breaker hitting as disclosed in Patent Document 3 is a point work that requires a high-precision positioning work, requires skill, and prevents the surface deposits from being damaged to the brick. It is difficult to improve the efficiency.

  As described above, it is difficult to remove the joint material on the tuyere surface in a short time with the conventional apparatus and method, and there is a problem that the maintenance time and maintenance frequency as a whole cannot be reduced.

  Therefore, the present invention solves these problems, sufficiently removes the deteriorated surface layer having a nonuniform hardness and shape at the nozzle tuyere of the molten metal storage container, and replaces the nozzle with a new nozzle hot. It is an object of the present invention to provide an apparatus and a method that can be performed efficiently.

  The present invention has been made in view of the above-described problem, and reaches the deepest part of the narrow tuyere of the molten metal storage container, and can sufficiently remove a deteriorated surface layer whose hardness and shape are not uniform on the inner surface of the tuyere. It is a compact device that can be operated remotely from outside the furnace with high efficiency without requiring skill.

  The summary is as follows.

  (1) A moving device capable of moving in a horizontal direction below the lower surface of the molten metal storage container, a gantry mounted on the moving device so as to be movable up and down, and a support gantry provided with a centering mechanism provided on the gantry. A rotating shaft support attached to the support frame, a rotating shaft rotatably supported on the rotating shaft support, and an upper end of the rotating shaft to support the striking device so that the elevation angle can be positioned. And a striking device having a surface tool for striking the tuyere surface of the molten metal storage container attached to the support, and heat of the nozzle tuyere deposits of the molten metal storage container Interim removal device.

  (2) The molten metal container according to (1), wherein the striking device has a piston that reciprocates at high speed with compressed air and the planar tool attached to the tip of the piston. Equipment for hot removal of nozzle tuyere deposits.

  (3) The planar tool has a large number of needle-like blades arranged densely on the front surface in the striking direction, with the nozzle tuyere of the molten metal storage container according to (1) or (2) Kimono hot removal device.

  (4) The planar tool is a planar tool having cemented carbide bits arranged in a grid pattern, and hot removal of nozzle tuyere deposits in the molten metal storage container according to (3) apparatus.

  (5) It is equipped with a cooling device that sprays water on the surface tool of the striking device, and the nozzle tuyere deposits hot in the molten metal storage container according to any one of (1) to (4) Removal device.

  (6) The surface tool of the hot removal device for nozzle tuyere deposits of the molten metal storage container according to any one of (1) to (5) is opposed to the surface of the tuyere of the molten metal storage container. To remove the deposits on the surface of the tuyere by moving the striking device in the depth direction and / or circumferential direction of the tuyere while performing the striking operation, and then attach the nozzle to the tuyere A hot exchange method for nozzles of a molten metal storage container.

  Since the apparatus and method of the present invention have the above configuration, the following effects are obtained.

  First, the striking device of the present apparatus is supported on a support frame supported by a centering mechanism of a frame that can be moved up and down so that it can be rotated and the elevation angle can be adjusted. The crushing / removing operation can be carried out by opposing it precisely, preferably perpendicularly to this, and the entire surface of the tuyere can be efficiently processed in a series of operations by rotating and raising / lowering the impacting device.

  Further, the centering mechanism automatically adjusts the deviation of the central axis, so that the tuyere surface can be treated reliably.

  Next, this device uses a compact surface tool based on the principle of crushing as a striking device, preferably a surface tool with a multi-needle blade made of a material with high hardness, and in the tool axis direction. A sufficient pressing force due to acceleration due to vibration is applied to the surface of the tuyere, so that the cutting edge of the tool bites into the joint material that has baked and hardened on the tuyere surface and the surface layer, making it easy to peel off, and deposits etc. are more planar than tools that make point contact Can be crushed and removed over a wide range with little damage to the tuyere.

  Further, preferably, the compressed air is used as a drive source for the impact device, and the impact mechanism is compact. In addition, the air cooling effect by the compressed air and the air jet cooling effect after the drive are combined, so that the continuous operation in the hot state is performed. Can withstand.

  As described above, the hitting device composed of the surface tool and the hitting mechanism is compact, so that it can be inserted into a narrow space such as a tundish tuyere and efficiently act on the entire range of the tuyere surface. be able to.

  In this way, crushing and removing work can be performed with high efficiency, and the nozzle replacement work can be carried out quickly, so that the working time is shortened and the temperature drop of the tundish is minimized, which is suitable for the subsequent casting work. is there.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  In addition, although the Example described below is an example to which this invention is applied and various restrictions are attached | subjected technically, the scope of the present invention is not limited to these aspects.

  Hereinafter, a tundish used for continuous casting of molten metal will be described as an example of the molten metal storage container.

  FIG. 1 is an overall schematic view showing the configuration of an embodiment of a hot removal device for nozzle tuyere deposits according to the present invention, FIG. 2 is a schematic sectional view of the main part of the device, and FIG. FIG. 4 is a schematic top view of the apparatus, and FIG. 4 is a schematic view taken along line AA of FIG.

  1 and 2, the tundish is shown with the old nozzle removed, and a tundish nozzle tuyere 3 is formed at the bottom of the tundish main body 1 by a refractory 2 such as brick or mortar. A nozzle (not shown) is attached to the tuyere. On the outside of the bottom of the tundish main body 1, an opening / closing device for adjusting the amount of molten metal supplied to the nozzle, a guide plate 4 for inserting a so-called sliding nozzle cassette is provided.

  As described above, the tundish that has been subjected to the predetermined casting needs to be replaced or repaired, and removes deposits such as joint materials adhering to the tuyeres refractories and the remainder of the nozzle refractories. For this purpose, the remaining hot water or residue remaining inside is discharged to a drain pan or the like and then placed on a fixed base (not shown).

  The apparatus for hot removal of nozzle tuyere deposits of the molten metal storage container of the present invention is below the lower surface of the molten metal storage container placed as described above, that is, between the lower surface of the storage container and the floor, It is comprised from the moving apparatus 6 which can move to a horizontal direction, and the removal apparatus 5 of the nozzle tuyere adhering matter mounted in this.

  The moving device 6 includes a cart 6a and wheels 6b, and includes a cart driving device 6c and a handle 6d. The handle 6d can be operated to move forward, backward, turn, and stop to adjust the positioning of the moving device 6. ing. Further, the moving device has a drive source / cooling water supply device 7 for supplying power for driving the rotary drive device and the striking device of the removing device 5 and power and compressed air for driving the lifter, or cooling water for the striking device. It is installed.

  It should be noted that the lifter, the rotary drive device of the removal device, the driving device, and the like can be driven and operated by a control device (not shown) attached to the moving device.

  The moving device 6 is provided with a gantry 8 and a lifter 9 for raising and lowering the gantry 8. A support gantry 10 having a centering mechanism is provided on the gantry 8. A rotating shaft support 11 is fixed to the support base 10, and a rotating support mechanism 12 such as a bearing or a bearing is provided on the rotating shaft support 11. The rotating shaft 13 is rotatably supported in a state of protruding from the upper end of the shaft support.

  A rotation drive device 14 that rotates the rotation shaft 13 is attached to the lower end of the rotation shaft support 11. A rotary joint 15 is inserted at the upper end of the rotary shaft 13 so that compressed air for driving the impacting device described later and cooling water for cooling can be supplied regardless of the rotation of the rotary shaft. .

  A support body 16 is attached to the upper end portion of the rotary joint 15 to support the striking device 17 so that the elevation angle can be positioned. FIG. 5 is a schematic view showing the mounting state of the support 16, the striking device 17, and the rotary joint 15. As shown in FIG. 5, the striking device 17 is fixed to the support 16 so as to be rotatable by a pin 18. It is possible to position the elevation angle of the striking device. That is, in the device of the present invention, the striking device is extremely compact and can be completely inserted into the tuyere. In order to strike and remove the deposit on the inner surface of the tuyere, it is efficient to strike with the normal direction of the inner surface of the tuyere as the hitting axial direction of the hitting device. However, in order to facilitate the insertion and extraction of the nozzles, the inner surface of the tuyere is usually provided with a draft in the axial direction and has a truncated cone shape. In order to set the striking axis direction of the striking device in the normal direction of the inner surface of the frusto-conical tuyere, it is necessary to give the striking device an elevation angle commensurate with this gradient, and the adjustable configuration as described above It is what.

  Next, the support frame 10 provided with the centering mechanism will be described with reference to FIGS.

  A lower support 21 that is supported on the frame 8 by a fixed ball bearer 20 so as to freely move in the horizontal direction, and is fixed on the lower support 21 in an inclined manner toward the center side (that is, the rotating shaft). A support leg 24 having a ball bear 23 at the tip is provided on the inclined support plate 22 at a location, and a support frame 10 fixed on the support leg is provided. A cylinder 25 is provided below the center of the support base 10. One end of a tension spring 26 is fixed near the lower end of the cylinder 25 and at three locations on the circumference thereof, and the other end of the tension spring 26 is fixed at three locations on the lower support 21. Thereby, the movement of the support frame 10 in the inclination direction can be easily performed.

  In the cylinder 25, the rotary shaft 13, the rotary shaft support mechanism 12, and the rotary drive device 14 are arranged.

  With this configuration, the support base 10 can freely move on the base 8 by the lower support base 21 and the ball bear 20 in the left-right direction and by the tilt support plate 22 and the ball bear 23 in the vertical direction (inclination direction). It becomes possible.

  As shown in FIG. 4, the lower support frame 21 is provided with four openings 32 around the opening having a gap with the cylinder 25. This is to avoid interference between the guide post and the striking device 17 as the support plate 30 of the guide post descends through the opening 32 as will be described later. It is preferable that the opening 32 has a large diameter in consideration of a horizontal shift of the support frame 10.

  The support frame 10 is provided with a guide post 27 with a lower end supported on a guide post support plate 30 supported by a suspension spring 31 suspended from the support frame 10. The upper end of the guide post 27 is provided so as to pass through a through hole 34 of a guide post cylinder 33 provided in the support frame 10 and protrude from the upper surface of the support frame 10. As described above, since the guide post 27 is supported by the suspension spring, the guide post 27 can be moved up and down relatively with respect to the support frame 10.

  A guide bar 28 is attached to the upper end of the guide post 27 and can be fitted to guide blocks 29 provided on the front and rear sides of the guide plate 4 on the lower surface of the tundish and on the left and right sides. Further, a stopper 35 is fixed on the upper surface of the support frame, and restricts the rising limit of the apparatus.

  Even when the apparatus or the tundish is inclined, when the gantry 8 is raised and the support gantry 10 is raised, the guide bar 28 is engaged with the guide block 29 and positioning in the traveling direction and the traverse direction is performed. Contact the plate. As a result, the center axis of the tuyere and the rotation shaft 13 of the repair device coincide with each other, and centering is performed with respect to the tuyere center axis.

  Therefore, as will be described later, when removing the deposits on the nozzle tuyere, when the gantry 8 is raised or lowered by the lifter 9 and the striking device moves up and down in the tuyere, the removing device is removed by the centering mechanism. The center axis of both the tundish tuyere and the tundish tuyere can be held so as not to hinder the work.

  Next, the rotary joint 15 will be described. In the removing device of the present invention, it is preferable that the striking device is operated with a fluid (compressed air). For this reason, a rotary joint is provided as means for supplying the working fluid to the striking device while rotating the striking device.

  In FIG. 5, a compressed air outlet 37 a is provided on the upper outer side of the rotary side 15 b of the rotary joint 15. A compressed air passage 39a extending in the axial direction is provided on the inner side, and the upper end thereof communicates with the compressed air outlet 37a. On the other hand, a compressed air inlet 36a is provided outside the fixed side 15a and is connected to a compressed air supply pipe (not shown). An annular groove 38a for compressed air is provided on the inner side of the fixed side 15a, that is, the side in contact with the rotating side 15b. The annular groove 38a communicates with the compressed air inlet 36a and the compressed air passage 39a through compressed air communication holes 40a and 41a, respectively. The compressed air A supplied from the compressed air supply pipe passes through the compressed air passage 39a from the compressed air inlet 36a, the compressed air communication hole 40a, the compressed air annular groove 38a, and the compressed air communication hole 41a, and is then supplied to the compressed air outlet. 37a is supplied to the striking device 17 through the compressed air supply pipe 43a. Seal bodies 42 are provided above and below the axial direction of the annular groove to prevent leakage of compressed air. Even if the rotating shaft rotates, the compressed air can be smoothly supplied to the striking device via the rotating side via the annular groove provided on the rotating shaft and the fixed side.

  Next, the striking device will be described. FIG. 6 is a perspective view showing an example of the striking device 17, and FIG. 7 is a schematic sectional view thereof.

  The striking device 17 is inserted into the tundish tuyere from the bottom and attaches to the surface of the tuyere and adheres to the surface of the tuyere and deposits such as nozzle debris remaining on the nozzle tuyere. Is formed by a striking mechanism 50 and a planar tool 51 attached to the tip of the striking mechanism 50, and the planar tool is vibrated in the axial direction of the striking mechanism. 51 vibrates and crushes and removes the deposits on the tuyere surface.

  Since the striking mechanism only has to vibrate the surface tool on the front surface in the axial direction, the mechanism can use electromagnetic means, fluid means, mechanical means, etc. In the case of a device that performs processing in between, it is preferable to use fluid means such as compressed air.

  The striking mechanism 50 shown in FIG. 6 is basically composed of a cylinder body 53 and a piston 54, and is operated by compressed air supplied from an air supply pipe 43a. As shown in FIG. 7, a planar tool 51 is attached to the tip of the piston 54 of the striking mechanism by a stop pin 55, and the piston 54 is reciprocated by compressed air in the cylinder 53 (reciprocating left and right in the figure). By doing so, the planar tool vibrates and strikes in front of it.

  This striking device is characterized in that it does not have an operation or a valve for switching the operation, and has a structure advantageous for improving the durability of the device of the present invention in a high-temperature working environment and making the device compact.

  Below, the main structure of a striking mechanism is demonstrated, referring FIG. In the description, the left side in the axial direction of the striking device of FIG. 7 is the front or front, the right side is the rear, the upper side from the axis is the upper side, and the lower side is the lower side.

  In FIG. 7, a piston 54 is coaxially disposed in a cylinder body 53 via a cylinder liner 56 that is incorporated so as to be reciprocally movable. The tip of the piston 54 can protrude from the tip of the cylinder 53. The rear surface of the cylinder liner 56 is a back head 57 fixed by a cap screw (not shown) via a rear piston stop washer 58b, and the front surface of the cylinder liner 56 is a cylinder body 53 via a front piston stop washer 58f. The cylinder body 53 is fixed by a cylinder front washer 59 arranged at the front of the cylinder. The piston 54 can move (slid) in the axial direction between the front stop washer 58 f and the rear stop washer 58 b in the cylinder liner 56.

  The cylinder body 53 is provided with an exhaust hole 60 and an upper external exhaust hole 61u on the upper side, and an air supply chamber 62, an air supply inlet 66, and a lower external exhaust hole 61l on the lower side. Further, on the inner periphery of the cylinder body 53, annular grooves that open toward the inner periphery are provided as a front exhaust groove 64f, an air supply groove 65, and a rear exhaust groove 64b, respectively. The air supply groove 65 is provided so as to communicate with the air supply inflow hole 66.

  The air supply chamber 62 is connected to a compressed air supply pipe 43a (not shown) that supplies compressed air to the striking mechanism, and also communicates with the air supply inflow hole 66.

  A rear exhaust communication hole 67 b is provided in the rear exhaust groove 64 b and communicates with the exhaust hole 60. The exhaust hole 60 communicates with the upper external exhaust hole 61u in front of it. The front exhaust groove 64f communicates with the exhaust hole 60 and communicates with the upper external exhaust hole 61u and also communicates with the lower external exhaust hole 61l in the lower part.

  The cylinder liner 56 is provided with a front upper exhaust hole 68fu, a front lower exhaust hole 68fl, an upper air supply hole 69u, a lower air supply hole 69l, a rear upper exhaust hole 68bu, and a rear lower exhaust hole 68bl in the axial direction. The cylinder body is disposed so as to communicate with the front exhaust groove 64f, the air supply groove 65, and the rear exhaust groove 64b.

  The piston 54 is configured such that the shaft diameter of the piston 54 is larger on the rear side 54b than on the front side 54f. The rear side 54b is configured with an operating portion for reciprocal movement as described below.

  A piston front chamber 70f is formed by the piston shaft portion, the front surface of the piston rear portion 54b, the cylinder front washer 59, and the cylinder liner 56 on the front side of the piston rear side 54b. A piston rear chamber 70b is formed by the end face, the rear piston stop washer 58b, and the cylinder liner 56.

  On the inner peripheral side of the rear side 54b of the piston, a rear air supply passage 71b is provided in the upper axial direction, and a front air supply passage 71f is provided in the lower axial direction. The rear end is opened to the piston rear chamber 70b, while the front end of the front air supply passage 71f is opened to the piston front chamber 70f. The rear end of the front air supply passage 71f is closed by a closing member 72.

  An annular groove is provided as a front switching groove 73f and a rear switching groove 73b on the outer periphery of the piston rear side 54b. The front switching groove 73f is provided with a front air supply communication hole 74f, and communicates with the front air supply passage 71b in front of the rear air supply passage 71b. The rear switching groove 73b is provided with a rear air supply communication hole 74b and communicates with the rear air supply passage 71f behind the front air supply passage 71f.

  An annular seal member 75 is disposed in the circumferential direction at two positions in the axial direction of the cylinder body 53 and the cylinder liner 56 to prevent leakage of working air (compressed air).

  Next, the operation of the striking mechanism will be described with reference to FIGS. 8A to 8C and FIGS. It is assumed that the compressed air is supplied from a supply pipe (not shown) to the air chamber 62 of the cylinder body and is supplied into the cylinder from the supply air inflow hole 66.

  In FIG. 8A, the piston 54 is most retracted, the rear end thereof is in a state of being substantially in contact with the rear piston stop washer 58b, and the piston rear chamber 70b is the smallest.

  In this state, the piston front switching groove 73f communicates with the cylinder liner upper air supply hole 69u, and the compressed air A flows from the air supply inflow hole 66 to the air supply groove 65, the cylinder liner lower air supply hole 69l and the upper air supply hole. The air flows through the air hole 69u, the piston front switching groove 73f, and the front air supply communication hole 74f, flows to the rear air supply passage 71b, is supplied to the piston rear chamber 70b, and acts to push the piston forward.

  At this time, the air in the piston front chamber 70f passes through the front upper exhaust hole 68fu, the front lower exhaust hole 68fl of the cylinder liner, the front exhaust groove 64f of the cylinder body, and communicates with the upper external exhaust hole 61u. It is discharged out of the apparatus through the external exhaust hole 61l.

  Air continues to be supplied to the piston rear chamber 70b, and the piston moves forward. Next, as shown in FIG. 8 (b), the piston front switching groove 73f also moves forward, and the communication with the upper and lower air supply holes 69u, 69l of the cylinder liner is blocked, so that the piston rear chamber 70b Since the air supply to the piston stops, the piston front chamber 70f is disconnected from the front upper exhaust hole 68fu and the front lower exhaust hole 68fl of the cylinder liner, so that the front exhaust groove 64f and the external exhaust hole Exhaust from 61u and 61l also stops, but the piston continues to move forward due to the inertial force, and the planar tool attached to the piston 54 strikes the inner surface of the tuyere.

  Next, as shown in FIG. 8C, the piston is further advanced, but the piston rear switching groove 73b communicates with the lower air supply hole 69l of the cylinder liner, and the compressed air A is supplied downward. Supply from the air hole 69l and the upper air supply hole 69u to the piston front chamber 70f is started via the rear switching groove 73b, the rear air supply communication hole 74b, and the front air supply passage 71f.

  When the air supply to the piston front chamber 70f is started and the piston 54 starts retreating, the communication between the piston rear chamber 70b and the rear upper exhaust hole 68bu and rear lower exhaust hole 68bl of the cylinder liner is performed as shown in FIG. However, the exhaust from the rear chamber of the piston is stopped and the communication between the rear switching groove 73b and the lower air supply hole 69l and the upper air supply hole 69u of the cylinder liner is shut off, and the air supply to the piston front chamber 70f is also stopped. Continues to retreat due to inertial force. Next, as shown in FIG. 9 (b), the front switching groove 73f communicates with the upper air supply hole 69u and the lower air supply hole 69l of the cylinder liner, and the compressed air A flows into the cylinder liner lower air supply hole 69l and the upper air supply hole 69l. The air is supplied to the piston rear chamber 70b through the air holes 69u, the front switching groove 73f, the front air supply communication hole 74f, and the rear air supply passage 71b.

  The piston stops when the pressure in the piston rear chamber exceeds the inertia force of the piston retracting due to the supply of air, and turns forward.

  When there is no hitting object on the front surface of the piston, the piston further advances from the state shown in FIG. 8C, and the front surface of the piston rear portion 54b tries to advance to a position just before contact with the front piston stop washer 58f. However, the pressure in the piston front chamber 70f is further increased, and the piston is stopped by the air cushion.

  By repeating the above operation, the piston reciprocally vibrates, whereby an axial vibration can be applied to the planar tool attached to the tip of the piston.

  Next, the planar tool will be described. As shown in the perspective view and the cross-sectional view showing the outline of the striking device in FIGS. 6 and 7, a large number of needle-like blades 52 are arranged in a lattice shape on the front surface of the planar tool 51. The planar tool 51 may be any tool as long as its rear surface is attached to the tip of the striking mechanism and the front surface has a shape that strikes the inner surface of the tuyere. Therefore, as shown in FIG. 6 or FIG. 7, the front surface may be planar, but the front surface may be curved so that it follows the shape of the inner surface of the tuyere. Further, from the viewpoint of efficiently crushing and removing hard materials such as joint materials and nozzles remaining on the inner surface of the tuyere, in order to give a wide range of sufficient impact and crushing force, FIG. 6 or FIG. As shown in the above, it is preferable to use a flat tool in which a large number of needle-like blades are densely arranged on the front surface. Moreover, it is preferable that the needle-shaped cutter 52 is a cemented carbide bit from the viewpoint of ensuring the machinability and wear resistance of the surface tool.

  In the present invention, the striking device having a configuration in which the piston and the planar tool are integrated is shown, but the piston and the planar tool may be separated from each other.

  In addition, a clearance is provided in advance between the support member 19 of the support 16 of the striking device 16 and the pin 18 so that the striking vibration can be stably applied. Is preferably ensured. As a result, the allowance for the striking device can be increased, and the striking can be continued easily.

  Furthermore, in order to improve the machinability of the surface tool in the hot state, it is preferable to provide a cooling device for cooling the surface tool. As this cooling device, for example, as shown in FIG. 10, a spray nozzle 44 capable of injecting cooling water is provided in the vicinity of the front surface of the planar tool 51, and cooling water is supplied via the rotary joint 15. The cooling water is sprayed on.

  The rotary joint 15 in FIG. 10 is configured so that cooling water can be supplied to the rotary joint in FIG. 5, and basically has the same configuration as that in FIG. It is shown as an example in conjunction with the supply of compressed air.

  A cooling water outlet 37w is provided on the upper outer side of the rotary side 15b of the rotary joint 15. Further, a cooling water passage 39w is provided inside, and an upper end thereof communicates with the cooling water outlet 37w. On the other hand, cooling water 36w is provided outside the fixed side 15a, and is connected to a cooling water supply pipe (not shown). An annular groove cooling water annular groove 38w is provided along the inner periphery on the inner side of the fixed side 15a, that is, the side in contact with the rotation side 15b. The annular groove 38w communicates with the cooling water inlet 36w and the cooling water passage 39w through cooling water communication holes 40w and 41w, respectively. The cooling water w supplied from the cooling water supply pipe (not shown) passes through the cooling water inlet 36w, the cooling water communication hole 40w, the cooling water annular groove 38w, the cooling water communication hole 41w, and the cooling water passage 39w. Then, the coolant is supplied from the coolant outlet 37w through the coolant supply pipe 43w to the spray nozzle 44 and is sprayed onto the surface tool of the impacting device 17. Sealing bodies 42 are provided above and below the axial direction of the annular groove to prevent leakage of cooling water, and even if the rotating shaft rotates, the annular groove is provided on the rotating side and the fixed side. Cooling water can be smoothly supplied to the rotating side.

  Next, a method for hot exchange of tundish using the apparatus of the present invention will be described.

  11 (a) to 11 (c) are schematic diagrams for explaining the movement of the apparatus when the deposits on the nozzle tuyere are removed using the apparatus of the present invention, and (a) is the movement and positioning of the apparatus. (B) shows the situation when the gantry is raised, and (c) shows the situation when the gantry is highest.

  The tundish from which the nozzles have been removed is placed on a fixed base (not shown), and there is a space between the floor and the floor. As shown in FIG. 11 (a), the moving device of the exchanging device includes the center axis of the tundish tuyere 3 and the center of the rotating shaft 13 of the removing device 5 in a state where the lifter 9 is reduced and the gantry 8 is lowered. The axis is moved to a predetermined position where the axes substantially coincide with each other and stopped. Note that the movement of the moving device is performed by operating the handle 6d as described above.

  After stopping at a predetermined position, as shown in FIG. 11 (b), the lifter drive device (not shown) is driven to raise the lifter 9, and the upper end of the guide bar 28 of the removal device 5 moves to the guide block 29. Raise until mated. At this time, the striking device 17 has reached the position below the tuyere. The pin of the support 16 is adjusted, and the elevation angle of the striking device is adjusted in advance so that the striking surface of the planar tool faces the tuyere surface. In this state, compressed air is supplied from the removing device / lifter drive source / cooling water supply device 7 to the striking device via the rotary joint to operate the striking mechanism. Further, the rotation driving device 14 is driven to rotate the rotating shaft 13. As a result, the surface of the tuyere is struck by a planar tool, and mortar and nozzle debris attached to the tuyere surface can be removed.

  Because the hammering device is equipped with a surface tool, it is possible to strike a certain area of the tuyere surface, and furthermore, the hammering device can be swung around the center axis of the tuyere, so that the tuyere surface is constant. The entire circumference is hit with a width of 2 mm, and the deposits can be removed in an annular shape.

  Further, the elevation angle of the striking device is adjusted so that the striking surface of the planar tool is substantially parallel to the tuyere surface, that is, the tuyere surface is substantially perpendicular to the striking direction. Can be efficiently removed.

  Next, the striking device is actuated to raise the gantry while rotating, and the deposits on the tuyere surface are removed from near the bottom of the tundish tuyere to the back of the tuyere (upper part of the tuyere).

  As shown in FIG. 11 (c), when the cradle is raised and the striking device almost reaches the upper part of the tuyere, the stopper 35 comes into contact with the guide plate 4 on the lower surface of the tundish, and the cradle does not rise any further. .

  Between the guide post 27 contacting the guide plate 4 on the lower surface of the tundish and after the stopper 35 contacts the guide plate 4 on the lower surface of the tundish, the guide bar 28 of the guide post 27 The front and rear, and left and right guide blocks 29 provided on the lower surface of the tundish are fitted together, and the support frame including the striking device is regulated so as to rise along this guide post, and includes these striking devices. This is for guiding the support frame so that the center axis does not shift when the support frame is raised or lowered. Until the stopper comes into contact with the guide plate, the guide post 27 is pushed downward by the suspension spring 31 that supports the guide post 27, and the guide post does not interfere with the rise of the striking device.

  Thus, since the surface tool of the hitting device is positioned to face the surface of the tundish tuyere, the lifter is raised while performing the hitting operation and / or in the depth direction of the tuyere. By rotating the striking device in the circumferential direction by rotating, it is possible to remove deposits such as residual mortar or residual nozzle on the tuyere surface. The striking stroke of the striking device is sufficient with respect to the remaining mortar and the thickness of the nozzle, so that the striking can be continued.

  This makes the tundish tuyere surface smooth and allows the new nozzle to be installed after the removal device has exited.

  The above configuration is an example for a tundish in an upright position. However, even when the tundish is in the horizontal direction, a cradle is attached to a mechanism that expands and contracts in the horizontal direction instead of a cradle that is lifted and lowered by a lifter, although details are omitted. Thus, an equivalent work can be performed. Although the tundish has been described as an example of the molten metal storage container, the present invention is not limited to this, and it goes without saying that the present invention can be applied to a molten metal storage container having nozzle tuyere.

1 is an overall schematic diagram of a hot removal device for nozzle tuyere deposits according to the present invention. It is a cross-sectional schematic diagram of the principal part of the hot removal apparatus of the nozzle tuyere deposit | attachment which concerns on this invention. The upper surface schematic diagram of the hot removal apparatus of the nozzle tuyere deposit | attachment which concerns on this invention. It is an AA view schematic diagram of FIG. It is the schematic which shows the condition of the attachment part of the striking device in the hot removal apparatus of the nozzle tuyere deposit | attachment which concerns on this invention. It is a perspective view of a striking device in a hot removal device for nozzle tuyere deposits according to the present invention. It is a cross-sectional schematic diagram which shows the structure of a striking device. (A)-(c) is a figure explaining operation | movement of a striking device. (A), (b) is a figure explaining operation | movement of a striking device. It is the schematic which shows the other example of a hot removal apparatus of the nozzle tuyere deposit | attachment which concerns on this invention, and shows the example which provided the cooling device in the striking device. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram explaining the operation | movement of the apparatus in the nozzle hot exchange apparatus of this invention, (a) at the time of movement and positioning of an apparatus, (b) at the time of a raise of a mount, (c) at the time of the maximum raise of a mount The situation of each is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Tundish 2 ... Refractory material 3 ... Tuyere 4 ... Guide plate 5 ... Nozzle tuyere deposit removal device 6 ... Moving device 6a ... Cart 6b ... Wheel 6c ... Cart drive device 6d ... Handle 7 ... Removal device / lifter Drive source / cooling water supply device 8 ... gantry 9 ... lifter 10 ... support gantry 11 ... rotation shaft support 12 ... rotation support mechanism 13 ... rotation shaft 14 ... rotation drive device 15 ... rotary joint 15a ... rotary joint fixed side 15b ... Rotary joint rotation side 16 ... support 17 ... blow device 18 ... pin 19 ... support member 20 ... ball bear 21 ... lower support 22 ... tilt support plate 23 ... ball bear 24 ... support leg 25 ... cylinder 26 ... tensile spring 27 ... guide post 28 ... Guide bar 29 ... Guide block 30 ... Guide post support plate 31 ... Suspension spring 32 ... Opening 33 ... Guide post cylinder 34 Through hole 35 ... Stopper 36a ... Compressed air inlet 36w ... Cooling water inlet 37a ... Compressed air outlet 37w ... Cooling water outlet 38a ... Compressed air annular groove 38w ... Cooling water annular groove 39a ... Compressed air passage 39w ... Cooling water Passage 40a, 41a ... Compressed air communication hole 40w, 41w ... Cooling water communication hole 42 ... Seal 43a ... Compressed air supply pipe 43w ... Cooling water supply pipe 44 ... Spray nozzle 50 ... Striking mechanism 51 ... Planar tool 52 ... Needle blade 53 ... Cylinder body 54 ... Piston 54f ... Piston front part 54b ... Piston rear part 55 ... Stop pin 56 ... Cylinder liner 57 ... Back head 58f ... Front piston stop washer 58b ... Rear piston stop washer 59 ... Cylinder front washer 60 ... Exhaust hole 61u ... Upper external exhaust hole 61l ... Lower external exhaust hole 62 Air supply chamber 64f ... front exhaust groove 64b ... rear exhaust groove 65 ... air supply groove 66 ... air supply inflow hole 67b ... rear exhaust communication hole 68fu ... front upper exhaust hole 68fl ... front lower exhaust hole 68bu ... rear upper exhaust hole 68bl ... rear lower exhaust hole 69u ... upper air supply hole 69l ... lower air supply hole 70f ... piston front chamber 70b ... piston rear chamber 71f ... front air supply passage 71b ... rear air supply passage 72 ... closing member 73f ... front switching groove 73b ... rear switching groove 74f ... front air supply communication hole 74b ... rear air supply communication hole 75 ... seal A ... compressed air W ... cooling water

Claims (6)

  A moving device capable of moving in a horizontal direction below the lower surface of the molten metal storage container; a pedestal mounted on the moving device so as to be movable up and down; a support gantry having a centering mechanism provided on the gantry; A rotary shaft support attached to the support base, a rotary shaft rotatably supported on the rotary shaft support, and a support attached to the upper end of the rotary shaft to support the striking device so that the elevation angle can be positioned. And a hot blow removal device for nozzle tuyere deposits in a molten metal storage container, characterized in that it comprises a striking device attached to the support and having a surface tool for striking the tuyere surface of the molten metal storage container .   2. The nozzle tuyere of a molten metal storage container according to claim 1, wherein the striking device has a piston that reciprocates at high speed with compressed air, and the planar tool attached to the tip of the piston. 3. Equipment for hot removal of deposits.   The hot removal of nozzle tuyere deposits in a molten metal storage container according to claim 1 or 2, wherein the planar tool has a large number of needle-like blades arranged closely on the front surface in the striking direction. apparatus.   4. The apparatus for hot removal of nozzle tuyere deposits in a molten metal storage container according to claim 3, wherein the planar tool is a planar tool having carbide bits arranged in a grid pattern.   The apparatus for hot removal of nozzle tuyere deposits of a molten metal storage container according to any one of claims 1 to 4, further comprising a cooling device for spraying water on the surface tool of the striking device.   The surface tool of the apparatus for hot removal of the nozzle tuyere deposits of the molten metal storage container according to any one of claims 1 to 5 is positioned on the surface of the tuyere of the molten metal storage container so as to face and hit Melting characterized by moving the impacting device in the depth direction and / or circumferential direction of the tuyere while performing the operation to remove deposits on the tuyere surface and then attaching a nozzle to the tuyere Hot exchange method for nozzles of metal storage containers.

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