JPH1043843A - Structure for connecting piping in tundish preheating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping connecting structure for a tundish preheating device which sufficiently holds the air-tightness in the connecting part of the piping in the tundish preheating device at a shifting side and the piping correspondent thereof at a fixed side and can simplify the connection or the separation of both pipings. SOLUTION: This structure is constituted of the piping 9b at the fixed side connected to an exhaust gas treating device set on the ground, the piping 9a at the shifting side connected to the tundish preheating device, a bellows type joint part 11 fitted to the piping 9b at the fixed side an flexible in the connecting direction of both pipings, an elastic body 12 expanded/contracted in the same direction as the expanding/contracting direction of this bellows type joint part 11, and adjusting mechanism 13 composed of an adjusting bolt 13a and arranged in the inner part of the elastic body 12 to adjust the connecting end surface position of the bellows type joint part 11 and further, a closely contact seal plate 14 joined with the connecting end surface of the bellows type joint part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting structure of a tundish preheating apparatus for connecting a moving side pipe of a tundish preheating apparatus provided in a cassette type tundish of a continuous casting machine and a fixed side pipe.

[0002]

2. Description of the Related Art Conventionally, two movable units are used to remove inclusions such as slag stored in a tundish inside a continuous casting machine without interrupting the supply of molten steel from a ladle. There is a case where a tundish is alternately used in a continuous casting machine in a cassette type. Further, by preheating the tundish before use to a set temperature by a tundish preheating device installed in the factory, the molten steel supplied to the tundish at the time of replacement is prevented from cooling and solidifying.

Further, the present applicant has developed a tundish preheating device having a higher preheating efficiency than before, and this tundish preheating device has two
Two small preheaters are installed, and combustion gas, inert gas, etc. are supplied to the preheater from a supply source installed in the factory via an air supply pipe, and this is supplied to two preheaters. The tundish is preheated using a high temperature inert gas alternately heated by a hot air. Further, the used high-temperature combustion exhaust gas is sent to an exhaust treatment device via an exhaust pipe.

[0004]

However, in the above-described tundish preheating device, the piping of the tundish preheating device attached to the moving-side tundish and the fixed-side piping corresponding to the moving-side piping are different from each other. When the tundish is connected or disconnected as needed along with the movement of the tundish, it is difficult to quickly connect or disconnect both pipes so that the tundish preheated to the set temperature is not cooled.

[0005] In addition, there is another problem that the connection portion of the exhaust pipe is heated to a high temperature and cannot be manually operated for a long time. In view of the above, the present invention has been made in view of the above-mentioned unsolved problems, and it has been necessary to sufficiently maintain the airtightness of a connection portion between a pipe of a moving-side tundish preheating device and a pipe of a fixed side. An object of the present invention is to provide a pipe connection structure of a tundish preheating device capable of easily and quickly connecting or disconnecting pipes.

[0006]

In order to solve the above-mentioned problems, a pipe connection structure of a tundish preheating device according to the present invention comprises a tundish attached to the tundish for preheating a movable tundish. A pipe connection structure for connecting a moving-side pipe of a preheating device and a fixed-side pipe corresponding to the moving-side pipe, wherein any one of the moving-side pipe connecting end and the fixed-side pipe connecting end And a bellows-like joint part that is expandable and contractible in the connection direction of the two pipes, and an elastic body is attached so as to expand and contract in the same direction as the expansion and contraction direction of the bellows-like joint part. An adhesive seal plate is attached to one or both of the connection end face and the connection end face of the other pipe connected thereto.

Thus, when connecting the moving-side pipe of the tundish preheating device and the corresponding fixed-side pipe, both connection ends are crimped and the state is maintained, and the connection end is provided on either one. The repulsive force of the elastic body at the pipe connection end and the pressing force applied from the other connection end are balanced and the airtightness of the butted connection end can be sufficiently increased. In addition, a bellows-like joint that can sufficiently hold the pressure of the internal fluid is attached to one of the pipe connection ends, and this bellows-like joint expands and contracts in the same direction as the elastic body deforms. By doing so, the elastic body and the bellows-like joint are compressed by the pressing force of the connected moving-side pipe, whereby the load is not applied to the connection end of the pipe, and damage to the pipe can be prevented.

[0008] Further, by attaching an adhesive seal plate to one or both of the connection end face of the pipe and the connection end face of the other pipe connected thereto, the two connection end faces to be abutted can be brought into close contact with no gap. it can.

Further, an adjusting mechanism for adjusting the position of the connection end face of the bellows-like joint portion is provided. This makes it possible to adjust the position of the connection end face to connect the moving-side pipe at the set position, and to prevent insufficient pressure of the butted connection end faces.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a tundish preheating device, which preheats a tundish 3 installed on an upper part of a carriage 2 that can travel to the inside of a continuous casting machine to a high temperature.

The tundish 3 can be tilted by 90 degrees around the center rotating shaft 3a of the tundish 3 in order to remove the slag accumulated inside. The brief configuration of the tundish preheating apparatus 1 will be briefly described. An inert gas supply source 4 installed in a factory
And air supply pipes 7 and 8 for supplying air from the combustion gas supply source 5 to two preheaters 61 and 62 attached to the upper part of the tundish 3, and are connected to the preheaters 61 and 62. And a flue gas pipe 9 for discharging the flue gas used for preheating the tundish 3 to a flue gas treatment device 10 on the ground.

As shown in FIG. 2, the preheating system of the tundish preheating apparatus 1 first includes a high-temperature inert gas which is passed through a heat storage body 61b heated to a high temperature inside a preheater 61. The gas is used as the combustion chamber 6
The tundish 3 is ejected from 1a into the inside of the tundish 3 to preheat the tundish 3. The inert gas cooled by transferring heat to the tundish 3 is sucked into the other preheater 62.

The preheater 62 takes in air and combustion gas into the combustion chamber 62a and burns it with a burner 62c. The inert gas sucked into the heated combustion chamber 62a removes the inert gas. Again. Then, the exhaust gas obtained by mixing the inert gas and the combustion exhaust gas passes through the heat storage body 62b and is discharged, thereby heating the heat storage body 62b to a high temperature.

Thereafter, when the heat storage body 62b is heated to the set temperature, each valve is switched, and the inert gas passes through the heat storage body 62b of the other preheater 62 to become a high-temperature inert gas. The gas is injected into the tundish 3 through the combustion chamber 62a to preheat the tundish 3. Further, the inert gas cooled by the heat transfer to the tundish 3 is supplied to the other preheater 61.
In the same manner as described above, air and combustion gas are taken into the combustion chamber 61a and burned by the burner 61c, and the inert gas drawn into the heated combustion chamber 61a is heated again by this. Then, the heat storage body 61b is heated to a high temperature.

By repeating this cycle alternately, a large amount of non-oxidized high-temperature inert gas can be continuously supplied to the tundish 3 by convective heat transfer.
Further, after heating the heat storage bodies 62a and 62b, the discharged exhaust gas passes through the moving-side pipe 9a and then passes through the fixed-side pipe 9b installed on the ground side, so that the exhaust gas treatment apparatus 10
Is discharged until.

As shown in FIG. 1, the pipe connection structure 30 at the connection between the moving side pipe 9a and the fixed side pipe 9b of the exhaust gas pipe 9 has a tundish preheating device 1 as shown in FIG. And a fixed-side pipe 9b corresponding to the movable-side pipe 9a and connected to the exhaust gas treatment device 10, and attached to the fixed-side pipe 9b and extendable and contractible in the connection direction of the two pipes. Bellows joint 11
And an elastic body 12 that expands and contracts in the same direction as the expansion and contraction direction of the bellows-like joint portion 11, and an adjustment bolt 13 a provided inside the elastic body 12 to adjust the position of the connection end face of the bellows-like joint portion 11. It comprises a mechanism 13 and an adhesive seal plate 14 joined to the connection end face of the bellows-like joint portion 11.

First, the fixed-side pipe 9b is made of a steel pipe having a diameter of about 40 cm, and a vertical fixed-side pipe 9b joined to a horizontal pipe is formed with an upwardly-facing connection end face. Is provided with an annular flange 15, and through holes 15a are formed at a plurality of locations.

The bellows-like joint portion 11 connected to the upper end surface of the flange 15 is made of stainless steel in order to sufficiently withstand the pressure of the exhaust gas passing therethrough. Flange 15 of side pipe 9b
And annular flanges 16 and 17 of the same shape as those of FIG.
a of the fixed side pipe 9b.
And a flange 17 at the lower end of the bellows-like joint portion 11 are fixed to each other by bolts 18 and nuts 19.

The upper and lower flanges 1 of the bellows-like joint 11
The washer 20 is placed at the same position in the upper and lower
The elastic body 12 of a coil spring is mounted between the upper and lower washers 20 here. In addition,
The elastic body 12 is not limited to this, and a gas spring or the like may be used.

Further, adjustment bolts 13a are provided through the inner periphery of the elastic body 12 and the holes of the upper and lower washers 20, and the double nuts 23 are sandwiched between the upper and lower washers 20.
It is fixed by.

An annular adhesive seal plate 14 having heat resistance is bonded and fixed to the upper end surface of the bellows-like joint portion 11 serving as a connection end surface with the fixed-side pipe 9b. On the other hand, the moving-side pipe 9a that is continuous with the tundish preheating device 1 has a vertically extending end and is made of a steel pipe having a diameter smaller than that of the fixed-side pipe 9b by one diameter. Are joined.

In this embodiment, the adhesive seal plate 14 is attached only to the upper end surface of the bellows-like joint portion 11, but it can also be attached to the corresponding connection end of the moving side pipe. it can.

The moving pipe 9a is opposed to the fixed pipe 9b by the moving mechanism of the cart 2 and an adjusting device (not shown) provided on the cart 2, and thereafter,
The two pipes 8 and 9 can be connected by being lowered toward the moving side pipe 9b and then butted against the upper end face of the bellows-like joint portion 11 so as to be pressed.

Thus, the moving-side pipe 9a of the tundish preheating device 1 presses the bellows-like joint portion 11 installed on the ground by automatic operation without relying on humans, and holds the state, and the fixed-side pipe 9a. The repulsive force of the elastic body 12 at the connection end of the connection end 9b and the pressing force applied from the moving-side pipe 9a are balanced, and the airtightness of the connection end that is brought into contact with the connection end 9b can be sufficiently enhanced.

Since the adhesive seal plate 14 is attached to the connection end face of the bellows-like joint portion 11, the two connection end faces to be abutted can be closely contacted without any gap. Also,
By mounting the adjusting mechanism 13 including the adjusting screw inside the elastic body 12, the upper end surface of the bellows-like joint portion 11 serving as the connection end surface with the moving-side pipe 9 a can be positioned. Can be matched without shifting the connection direction.

In this embodiment, the connecting direction between the moving side pipe 9a and the fixed side pipe 9b is set to the vertical direction. However, the connecting direction is not necessarily limited to this direction. Of course, if the bellows-like joint portion 11 can be pressurized from the moving side pipe 9a, it can be connected in a horizontal direction or the like.

Further, in this embodiment, the case where the pipe connection structure of the tundish preheating device 1 is applied to the connection portion of the exhaust gas pipe has been described. However, the present invention is not necessarily limited to this. Needless to say, the present invention can be applied to a connection portion of a pipe such as a gas or an inert gas.

[0028]

As described above, according to the pipe connection structure of the tundish preheating apparatus of the present invention, the fixed side pipe on the ground side can be connected to the ground side by using the pressure from the tundish side without manual operation. The connecting pipe is connected to the moving pipe on the side of the tundish preheating device facing the pipe, and the repulsive force of the elastic body at the fixed pipe connecting end and the pressure applied from the other connecting end are balanced. Since the airtightness of the pipe can be sufficiently improved, the connecting and disconnecting work between the fixed-side pipe and the moving-side pipe of the exhaust gas pipe, which is particularly high in temperature, can be performed easily and quickly.

Further, by providing an adjusting mechanism for adjusting the position of the connection end face of the bellows-like joint portion, it is possible to prevent the position of the connection end face from being shifted and the airtightness from becoming insufficient, and to prevent the internal fluid from flowing. Can be prevented from leaking into the factory and deteriorating the surrounding environment.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a tundish preheating apparatus applied to an embodiment of the present invention.

FIG. 2 is a system diagram showing a preheating system of a tundish preheating apparatus applied to an embodiment of the present invention.

FIG. 3 is a view showing a pipe connection structure of the tundish preheating apparatus according to the embodiment of the present invention. FIG. 1 is a sectional view taken along line AA of FIG. 2, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tundish preheating apparatus 2 ... Dolly 3 ... Tundish 4, 5 ... Supply source 7-9 ... Piping 9a ... Moving side piping 9b ... Fixed side piping 10 ... Exhaust gas treatment device 11 ... Bellows-like joint part 12 Elastic body 13 Adjustment mechanism 14 Adhesive seal plate 15-17 Flange 18 Bolt 19 Nut 20 Washer 61, 62 Preheater 61a, 62a ... Combustion chambers 61b, 62b ... Heat storage elements

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Nobutaka Goto, Inventor 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. 2-4-7 Chugai Furnace Industry Co., Ltd. (72) Inventor Yu Kitamura 2-4-7 Kyomachibori, Nishi-ku, Osaka-shi, Osaka Inside Chugai Furnace Industry Co., Ltd.

Claims (2)

[Claims] 1. A pipe connection structure for connecting a moving side pipe of a tundish preheating device attached to the tundish for preheating a movable tundish, and a fixed side pipe corresponding to the moving side pipe. And a bellows-like joint attached to one of the moving-side pipe connection end and the fixed-side pipe connection end, and capable of expanding and contracting in the connection direction of the two pipes. An elastic body that expands and contracts in the same direction as the expansion and contraction direction of the joint portion is attached, and an adhesive seal plate is attached to one or both of the connection end surface of the bellows-like joint portion and the connection end surface of the other pipe connected thereto. A pipe connection structure for a tundish preheating device. 2. The pipe connection structure for a tundish preheating device according to claim 1, further comprising an adjusting mechanism for adjusting a position of a connection end face of the bellows-like joint portion. Construction.