JPS63123560A - Method and apparatus for forming monolithic refractory into cylindrical shape - Google Patents

Abstract

PURPOSE:To uniformize the refractory layer and to reduce the production cost by forming the cylindrical space part by rotatable roller group, next rotating the roller and executing the formation by pressing to the prescribed distance toward center direction. CONSTITUTION:A pipe rotating table 12a is arranged on a laying table 12, which is possible to rise and fall, and a core rod 29 is arranged, and plural rotatable rollers 14 are set around the rod 29 at the suitable interval. The monolithic refractory 64, which is beforehand kneaded, is charged in the gap between the core rod 29 and the rollers 14, from a charging hole 47, and also is heated by an electric heater 14a. The rollers 14 are rotated by rotating a motor 26, and at the same time of pressing by a pressing hammer 44 from upside, the rollers 14 are pressed toward center direction to form the refractory 64. In this way, the refractory layer is uniformized and as the production time is shortened and metal mold, etc., does not need, the production cost is reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for forming a monolithic refractory coating of a lance vibrator used for refining in a steel mill, for example, in a tokudokar, a ladle, etc. into a cylindrical shape. The present invention relates to a molding method and apparatus.

[Conventional technology]

In recent years, there has been a strong demand for higher quality steel, and each steel manufacturer has tended to eliminate harmful elements in hot metal and molten steel and focus on producing high-purity steel.
BACKGROUND ART Refining agents have been injected using lance pipes for out-of-furnace refining such as desiliconization, dephosphorization, and desulfurization in hot metal, as well as desulfurization in molten steel.

This lance vibe has a cylindrical shape, for example, a diameter of 250 mm.
~4001111, the length is 5 to 13 m, and a monolithic refractory kneaded with water is placed around the outer periphery of a core bar (blowpipe part) consisting of a pipe with a diameter of 40 to 100 Il111, which is usually installed inside. It was poured into a metal frame and cured within the frame for a predetermined period of time to be molded. This metal frame was divided into vertical and horizontal types due to the height relationship with the factory, handling equipment, and safety aspects.After the wiring was completed, 8 to 12 hours of curing time was required, so the required number of metal frames were used. It was necessary.

In addition, as an invention related to this, Japanese Patent Application Laid-Open No. 56-876
There is a method for forming a protective coating layer for a lance immersed in molten metal, which is described in Japanese Patent No. The gist of this article is to set a coating material in the gap, then inject and fill the gap to form a coating layer, and then dry this. However, since a fixed formwork is used, the rollers described below are This is different from the present invention, which molds by rotating.

[Problem that the invention seeks to solve]

By the way, the conventional method for manufacturing a lance vibrator formed into a cylindrical shape as described above has the following problems.

■The manufacturing process for Lance Vibes was long, as it required 8 to 12 hours of curing time after mixing with a predetermined moisture content, pouring into the metal frame, and vibration molding using a vibrator. It was a long time. ■Because the above-mentioned curing time is required, the required number of metal rods must be installed, which requires factory space, which is the cause of high equipment costs such as land, building area, metal frames, frames, etc. in factory planning. It became. ■When performing vibration molding, there are two methods: using a vibrator attached to a metal rod, and using a rod-shaped pie break performed by a person from above, but in the former case, segregation of particle size occurs and the lifespan of the lance vibrator increases. In the case of the latter, it was caused by an increase in the number of personnel because it was based on human labor.

■The inside of the metal frame required daily cleaning and maintenance, which resulted in an increase in personnel.

■On the other hand, as a way to extend the life of the lance vibe,
There is a method to lower the porosity by lowering the moisture content, but when pouring into a metal frame, a predetermined moisture content is determined to ensure fluidity, and there are limits to how long the life can be extended.

The present invention has been made in view of the above circumstances, and it shortens the overall manufacturing time, eliminates the need for a metal rod for curing the monolithic refractory, and does not require human labor, and the monolithic refractory can be easily molded during molding. An object of the present invention is to provide a manufacturing method and apparatus for forming a monolithic refractory into a cylindrical shape with a small amount of moisture.

[Means to solve problems]

A manufacturing method for forming a monolithic refractory into a cylindrical shape according to the present invention in accordance with the above-mentioned object is to introduce a pre-kneaded monolithic refractory into a space surrounded by a plurality of freely rotatable rollers, and The rollers are rotated and each roller is pressed toward the center up to a predetermined distance to form the mold.

Furthermore, the present invention is also applicable to a pipe in which a pipe (usually referred to as a core metal) with studs welded around the circumference is arranged in the center of the space surrounded by the roller, depending on the purpose of use. It is something that

If necessary, it is also possible to install a device that tamps and compresses the input monolithic refractories from above using a rammer, and furthermore, a vibration source can be attached to each roller to vibrate each roller. It is also possible to compress the monolithic refractories that have been introduced.

Next, the apparatus for forming the monolithic refractory into a columnar shape includes a mounting table that supports the input monolithic refractory and a pipe covering the monolithic refractory, and a monolithic refractory placed on the mounting table. A plurality of rollers that surround an object, are arranged concentrically at appropriate intervals around the pipe, and are rotatably attached to upper and lower support plates, and a pressure force that presses the plurality of rollers toward the center. and a rotation mechanism that rotates the plurality of rollers around the monolithic refractory to be molded.

Here, arranging the rollers at appropriate intervals refers to an interval at which the monolithic refractory placed inside will not leak out when a plurality of rollers are rotated concentrically at a predetermined speed.

In addition, in response to changes in the length of the pipe, the mounting table can be raised and lowered using a lifting device, or a pipe swivel support can be provided on the mounting table to rotate the pipe. , a plurality of rollers surrounding the monolithic refractory are mounted on an integrated pedestal together with a rotating mechanism thereof, and this pedestal is provided with an elevating mechanism so that the rollers move up and down around the monolithic refractory. It may be something that has become.

[Effect]

To explain in detail the operation of the apparatus for forming the above-mentioned monolithic refractory into a cylindrical shape, first, the pipe serving as the central axis is supported by a mounting table, and the monolithic refractory is pre-kneaded to a predetermined viscosity on the mounting table. Insert. Since the monolithic refractory is surrounded by rotating rollers arranged on concentric circles at appropriate intervals, the monolithic refractory will not leak from the sides. The diameter is increased so that a sufficient amount of monolithic refractories can be put into the interior, and after a predetermined amount or more of monolithic refractories have been introduced, the plurality of rollers are rotated and the rollers are rotated. Make sure that the monolithic refractory does not leak from the gaps.

Here, since the plurality of rollers are rotatably attached, they rotate while contacting the monolithic refractory.

Under these conditions, after adding a predetermined amount of monolithic refractories,
When a plurality of rollers are pressed toward the center by a pressing mechanism, the entire monolithic refractory is tightened and formed into a cylindrical shape.

〔Example〕

Next, an embodiment embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.

Here, FIG. 1 is a partially omitted sectional view of an apparatus for forming a monolithic refractory into a columnar shape using the method of forming a monolithic refractory into a columnar shape according to the present invention, and FIG. FIG. 3 is a cross-sectional view taken along the line A-A in the figure, and a schematic perspective view of an apparatus for forming a monolithic refractory into a cylindrical shape according to another embodiment of the present invention.

As shown in FIG. 1, an apparatus 10 for forming a monolithic refractory into a columnar shape employing a method of forming a monolithic refractory into a columnar shape according to an embodiment of the present invention is equipped with an elevating device 11. A mounting table 12, a plurality of rollers 14 that freely surround a lance pipe 13, which is an example of a molded product, and the rollers 14.
upper and lower bearings 15.16, a support member 17.18 to which the bearings 15.16 are attached, and the support member 17.1.
Southeast 19.20 connected to 8 and the gear 19.2
A bearing 21 with an upper hole and a bearing 22 with a lower hole that are rotatably attached to the inside of the 0 via bearings, a small gear 23.24 that meshes with the gear 19.20, and a small gear 23.24 that meshes with the gear 19.20. It has a gearbox 25 and a motor 26 that are rotationally driven, a pedestal 27 for fixing the upper bearing 21 with a hole, the bearing 22 with a lower hole, the gearbox 25, and the motor 26, and a lifting mechanism 28 for the pedestal 27. has been done.

These will be explained in more detail below.

The elevating device If attached to the lower part of the above-mentioned mounting table 12 consists of a lift, and includes a hydraulic cylinder (not shown) (or
The mounting table 12, which is placed on the upper part by an electric cylinder), is attached to the core metal 2, which is the center pipe of the lance pipe 13.
It can be moved up and down according to the length of 9. A pipe turning table 12a having a thrust bearing is provided on the mounting table 12, so that the entire lance pipe 13 can freely rotate.

As shown in FIG. 2, a plurality of rollers 14 are arranged concentrically and closely spaced at appropriate intervals surrounding the lance vibrator 13.
4a is provided so that current flows through a slip ring (not shown) to heat the entire roller 14. The roller 14 is rotatably supported by upper and lower bearings 15 and 16. This lower bearing 16
(The same applies to the upper bearing 15).Two of them are arranged on each of the split flanges 31, 32, 33, and 34 shown in FIG. Hydraulic cylinders, which can freely slide in the radial direction of the concentric circles formed by the flanges 31, 32, 33, and 34, are provided in the center of the cylinders, and are an example of a pressing mechanism for advancing and retracting the separate flanges 31, 32, 33, and 34 in the radial direction. (Air cylinders may also be used) 35, 36, 37, 38 (the same numbers are used on the top and the explanation is omitted) are installed,
It has a structure that presses the plurality of rollers 14 in the radial direction.

Incidentally, the hydraulic cylinders 35, 36, 37, and 38 provided at the upper and lower parts of the roller 14 are equipped with FI! A synchronized valve (not shown) is attached, and each roller is configured to press the monolithic refractory inside while always drawing a concentric circle with the core metal 29 as the center. The entire roller 14 is attached to a common frame (not shown), and a vibrator, which is an example of a vibration source, is attached to the common frame, and it is also possible to apply vibration to each roller by this pie break. It is possible to compact it. In this case, the common frame will be constructed independently of the support members 17 and 18, and will be connected to each other by an elastic material such as rubber or a spring, if necessary.

The hydraulic cylinders 35, 36, 37, 38 and split flanges 31, 32, 33, 34 are attached to upper and lower support members 17.18, which are connected as one body, respectively, and these are connected to the core metal 29 by a rotating mechanism 39, 49. It rotates around the center.

This rotation mechanism 39.40 includes upper and lower support members 17.18.
The gear 19 includes a gear 19.20 attached to the gear 19.20, a small gear 23.24 that meshes with the gear 19.20, and a motor 26 that rotationally drives the small gear 23.24.
．． An upper hole bearing 21 and a lower hole bearing 22 are attached to 20 via bearings 41 and 42, respectively, and a gear 19.20 to which a support member 17.18 is attached is rotatably attached.

On the other hand, a rammer mechanism 43 is attached to the upper support member so as to surround the core metal 29.
3 has a pressing hammer 44 attached to the end of the upper support member 17 via a hinge, a hydraulic cylinder 45 that drives the pressing hammer 44, and a supporting member 46 that holds the hydraulic cylinder 45. It is designed to press the input monolithic refractories from above.

A charging hole 47 sufficiently larger than the outer diameter of the lance vibrator is formed in the bearing 21 with the upper hole, and a space is formed into which pre-kneaded monolithic refractories are charged from the upper part. A chute 48 is attached to guide the monolithic refractories introduced from the top to a predetermined location.

The upper hole bearing 21 and the lower hole bearing 22 are each fixed to the pedestal 27 via attachment members. As shown in the figure, a motor 26 (including a deceleration motor) is attached to this pedestal 27, and a gearbox 25 composed of bevel gears is provided on the motor 26, and an upper shaft 49 and a lower Since the small gears 23 and 24 constituting the rotation mechanism described above are attached to the shaft 50, the roller 14 is eventually rotated by rotating the motor 26. Incidentally, shafts and bearings (not shown) are provided at the upper part of the small gear 23 and the lower part of the small gear 24, respectively, so that the small gears 23 and 24 are rotatably supported.

A lifting mechanism 28 is attached to the upper and lower sides of the pedestal 27. This elevating mechanism 28 includes pairs of guide rollers 52 and 53 attached to the upper and lower sides of the pedestal 27, and chain-shaped pins 5 arranged at predetermined intervals.
The gear 55. 56 is fixed to the pedestal 27 side, and the gear 57
The entire pedestal 27 is raised and lowered by being rotationally driven by a motor (not shown).

A wedge-shaped stopper 58 and a driving device 59 for the stopper 58 are provided at the lower part of the guide roller 52, and in an emergency, the stopper 58 pops out,
The guide roller 52 is locked to prevent the pedestal 27 from falling.Furthermore, a ratchet mechanism that engages with the chain-shaped bin 54 (not shown) is provided to ensure safety when the entire device is raised. It has become.

A cart 61 that supports the upper flange 60 of the lance pipe 13 is provided at the top of the pedestal 27.The cart 61 is equipped with a rotation mechanism (not shown), and the lance vibrator 13 is suspended from above. It rotates at a predetermined speed if necessary.

A hot air pipe 60b attached to a hot air source (not shown) is attached to the upper flange 60 of the lance vibe 13 via a rotary joint 60a, which sends hot air into the core metal 29 and blows the outer monolithic refractory inside. It can be heated from

Note that oil is supplied to the hydraulic cylinders 35 to 38, 45 through a rotary joint (also referred to as a swivel joint) 62 attached around the upper support member 17.

Next, the operation of the apparatus 10 for forming the monolithic refractory into a cylindrical shape according to the above embodiment will be explained in detail, and the method for forming the monolithic refractory into a cylindrical shape according to the present invention will also be explained.

First, after the upper flange 60 of the lance vibrator 13 is hooked to the cart 61 by a transport means (not shown), the pedestal 27 is raised to a predetermined position by the lifting mechanism 28, and then the lifting device 11 of the mounting table 12 is driven. The mounting table 12 is brought into contact with the lower end of the lance vibrator 13.

In this case, a protrusion 63 that fits into the outlet hole of the lance vibrator 13 is attached to the center of the mounting table 12 to ensure that the lower end of the lance vibrator is on the mounting table 12 and the amount of pipe rotation is at a predetermined position on the table 12a. It is now fixed to .

Next, the hydraulic cylinders 35 to 38 are retracted, and the roller 14
The concentricity formed by the rollers 14 when opened.

The diameter of the circle is made slightly larger, and the motor 26 is started to cause the rollers 14 to revolve concentrically, and then the monolithic refractory 64 that has been kneaded in advance is introduced through the upper injection hole 47. Here, the amount of water in the monolithic refractory 64 is slightly larger than the amount of water necessary for the monolithic refractory 64 to harden (3
~4%). In this case, it is preferable to supply current to an electric heater disposed inside the lance vibrator 13 and to heat the monolithic refractory 64 by blowing hot air into the lance pipe 13 from the hot air pipe 60b at the top. When a thermosetting material is used as the material for the shaped refractory, it hardens quickly and exhibits remarkable hardening.

Since the roller 14 contacts the monolithic refractory 64 and revolves around the core metal 29 of the lance vibe 13 while rotating, the monolithic refractory 64 that has been thrown in will not leak from the gap between the rollers 14. .

In this state, a predetermined amount of the monolithic refractory 64 is introduced from the top, and the hydraulic cylinder 45 at the top is driven to press the monolithic refractory 64 with the pressing hammer 44 . As a result, the monolithic refractory 64 is sufficiently fitted into the gap between the roller 14 and the core metal 29. Next, the hydraulic cylinders 35 to 38 are gradually extended to reduce the diameter of the concentric circle formed by the roller 14. Make sure to press the monolithic refractory inside.

This improves the packing density of the monolithic refractory 64, resulting in a long service life.

Through the above steps, the monolithic refractory 64 can be pressed from the top and from the sides and formed into a cylindrical shape. After the above steps, including the vibration step if necessary, are completed, the hydraulic cylinders 35 to 38 are After the compaction roller 14 is opened and the entire apparatus 10 for forming the monolithic refractory into a columnar shape is raised by a predetermined length by the elevating mechanism 28 provided on the side, the monolithic refractory on the upper part of the lance vibrator 13 is further raised. Since the monolithic refractory 64 is kneaded with a slightly lower amount of water than usual, it will have a substantially constant shape after being formed (as shown in the second figure). It is held in a cylindrical shape. In this case, a curing accelerator or the like may be mixed into the monolithic refractory 64 if necessary.

In the above embodiment, it is possible to apply appropriate vibration to the roller 14, but for example, the core metal 29, the mounting table 12 on which the core metal 29 is placed, or the pipe swing receiver can also apply vibration to the table 12a. This makes it possible to form a monolithic refractory layer with even higher density.
It becomes possible to ensure the long life of the lance vibe.

In the above embodiment, a plurality of rollers are arranged on the same circumference, but for example, as shown in FIG. 3, tire rollers 71.
A lance vibrator 73, which is an example of a monolithic refractory product, is placed in a space surrounded by opposing tire rollers 71 and 72, while supplying monolithic refractories as raw materials. The method of the present invention can also be applied to press molding. Here, 74.75 indicates the drive shaft of the tire roller 71.72, and further,
In order to improve the workability of monolithic refractories, the rollers shown in Figure 2 and the tire rollers shown in Figure 3 are used in combination (for example, the tire rollers are arranged before or after the rollers). The present invention is also applicable to these cases.

〔Effect of the invention〕

The method and apparatus for forming a monolithic refractory into a cylindrical shape according to the present invention does not require pouring the monolithic refractory as a raw material, and therefore requires less moisture, so the subsequent curing time can be shortened. The time to manufacture products has become shorter.

For this reason, the metal rod that forms the outside of the lance vibe is no longer needed.

Furthermore, since the pre-kneaded monolithic refractory with poor fluidity is poured from above, segregation does not occur and a uniform monolithic refractory layer can be formed.

Furthermore, since it is molded while being pressed by rollers from the sides and has a low moisture content, the filling rate of the material increases.
The lifespan of the lance vibe has been extended.

Continuous unmanned construction is now possible, improving the working environment.
Safety has improved.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted cross-sectional view of an apparatus for forming a monolithic refractory into a columnar shape using the method of forming a monolithic refractory into a columnar shape according to the present invention, and FIG. 2 is a cross-sectional view shown by the arrows in FIG. View A-
A sectional view of part A and FIG. 3 are schematic perspective views of an apparatus for forming a monolithic refractory into a cylindrical shape according to another embodiment of the present invention. [Explanation of symbols] 10...--A device for forming a monolithic refractory into a cylindrical shape, ζ1 L----1 lifting device, 12-----m
-Placement stand, 12a...---Pipe rotation support is stand, 1
3...-Lance pipe, 14---Roller, 1
4a......Electric heater, 15.16...
-Bearing, 19.20... -11--Gear, 23.24.
−・−・・− Small gear, 25・−・− Gearbox, 2
6---Motor, 27-- Frame, 28--
・-・・・Lifting mechanism, 29-・・・・Core metal, 39.40
--------・Rotating mechanism, 43... Rammer mechanism, 48------Chute, 52.53 ・-
Guide roller, 54... Chain-shaped pin, 60
b・-・−・Hot air pipe, 64・・・・Unshaped refractory agent Patent attorney Fujio Nakamae jM2 diagram

Claims (10)

[Claims] (1) A pre-kneaded monolithic refractory is placed in a space surrounded by a plurality of freely rotatable rollers, and while the rollers are rotated, each roller is pressed to a predetermined distance toward the center to form the material. A method for forming a monolithic refractory into a cylindrical shape. (2) A method for forming a monolithic refractory into a cylindrical shape according to claim 1, wherein a pipe around which studs are welded is disposed at the center of the space surrounded by the rollers. (3) The pipe that serves as the central core metal is connected to the rotating mechanism,
3. The method for forming a monolithic refractory into a cylindrical shape according to claim 2, wherein the forming is performed while rotating the pipe. (4) The introduced monolithic refractory is compressed from above by a rammer, and vibrations from each roller are applied from the side. A method of forming monolithic refractories into a cylindrical shape. (5) A method for forming a monolithic refractory into a cylindrical shape according to claim 1, 2, 3, or 4, wherein the introduced monolithic refractory is heated by a heat source. . (6) A mounting table that supports the introduced monolithic refractories and the pipe covering the monolithic refractories, and surrounding the monolithic refractories placed on the mounting platform, concentrically with the pipe as the center. A plurality of rollers that are closely arranged and rotatably attached to upper and lower support plates, a pressing mechanism that presses the plurality of rollers toward the center, and an irregular shape into which the plurality of rollers are to be formed. 1. An apparatus for forming a monolithic refractory into a cylindrical shape, comprising a rotation mechanism for rotating the refractory. (7) An apparatus for forming a monolithic refractory into a cylindrical shape according to claim 6, wherein the mounting table is provided with an elevating device and a pipe rotation cradle. (8) The plurality of rollers surrounding the monolithic refractory are mounted on an integrated pedestal together with their rotation mechanism, and this pedestal is equipped with an elevating mechanism so that the rollers move up and down around the monolithic refractory. An apparatus for forming a monolithic refractory into a cylindrical shape according to claim 6 or 7. (9) A vibration source is attached to each roller so that it can be forcibly vibrated.
An apparatus for forming the monolithic refractory described in Section 2 into a cylindrical shape. (10) An apparatus for forming a monolithic refractory into a cylindrical shape according to claim 6 or 7, wherein each roller is provided with a heater, and the central pipe is heated by hot air.