JPH0410208Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a gas seal structure for a drive device that rotates a distribution chute arranged at the top of a blast furnace.

``Prior art'' In a blast furnace, a furnace top charging device is used to charge materials such as ore and coke into the furnace.
A bell-less furnace top charging device is known.

This bell-less type furnace top charging device uses two stages of seal valves to seal the gas, and continuously rotates the distribution chute installed in the furnace to distribute and charge the material.The overall structure is compact and high. It has the advantage of being able to make the temperature relatively low, and has recently begun to be widely adopted.

FIGS. 3 to 5 show an example of a conventional water-cooled bell-less furnace top charging device.

Reference numeral 1 in FIG. 3 denotes a casing disposed at the top of the blast furnace, and the casing 1 consists of a conical shell 1a and a cover 1b and a flange 1c provided on the upper and lower sides, respectively. A distribution chute 2 is provided at the center of the conical shell 1a for distributing and charging materials such as ore or coke into the furnace from an upper opening. The distribution chute 2 has a conical barrel 1
A driving device 3 provided in a allows the furnace to be rotated around the center line l of the furnace, and the inclination angle can be changed arbitrarily.

The drive device 3 will be explained with reference to FIG. 4. Inside the casing 1 is a rotary table 5.
is arranged rotatably about the center line l. This table 5 supports the distribution chute 2 and comprises an upper upright part 6, a horizontal part 7, a lower upright part 8 and a flange part 9 attached to the lower end of the lower upright part 8.

The upper upright portion 6 has a cross section L on the outer periphery of the cylindrical member 10.
It is formed by fixing a letter-shaped member 11 and has a ring groove 12 with an open top. Projections 10a and 11a are formed on the upper portions of the cylindrical member 10 and the member 11 having an L-shaped cross section, respectively, and these projections are loosely fitted into ring grooves provided in the casing cover 1b. A mounting hardware 13 is attached to the outer periphery of the member 11 having an L-shaped cross section, and a bearing 14 is provided between the mounting hardware 13 and the casing cover 1b. This bearing 1
A rotary table 5 is rotatably supported by 4. The bearing 14 consists of an outer ring 14a fixed to the mounting hardware 13, an inner ring 14b fixed to the casing cover 1b, and a ball 14c interposed between the two rings. A toothed portion 14d is formed on the outer periphery of the outer ring 14a, and the output of the driving force transmission system 15 arranged in the space S formed between the casing 1 and the rotary table 5 is transmitted to the rotary table 5 via the toothed portion 14d. The table 5 and the distribution chute 2 are rotated.

Further, the drive device 3 is provided with a water-cooled cooling device. That is, a ring-shaped hollow part 16 is provided on the lower surface of the casing cover 1b so that the rotary table 5
Water is supplied to the hollow portion 16 from a plurality of water supply nozzles 17 provided along the circumferential direction of the casing cover 1b. The water supplied to the hollow part 16 is
The liquid is supplied to the ring groove 12 of the rotary table 5 through a communication nozzle 18 extending from the ring groove 6, and from there to the lower cooling panels 20a, 20b via a pipe 19 penetrating the bottom of the ring groove.

The cooling panels 20a and 20b are connected to the rotary table 5.
The cooling pipes are attached to the upper surface of the horizontal part 7 and the outer circumferential surface of the lower upright part 8, respectively.For example, cooling pipes are arranged in a serpentine shape in a frame made of an iron plate, and the cooling pipes and the frame are attached to each other. A structure in which a tube is filled with an amorphous refractory material that has excellent thermal conductivity is used.

On the other hand, inside the lower flange 1c of the casing 1, a trough 21 having a U-shaped cross section is provided continuously in the circumferential direction in a ring shape, located below the horizontal portion 7 of the rotary table 5. . The water flowing inside the cooling panels 20a and 20b is guided into the trough 21 via piping 22 which is provided at appropriate intervals in the circumferential direction and penetrates the cover body 28, which will be described later. It is discharged to the outside through a discharge pipe 23 extending from the lower part of the side wall and penetrating the mantel 32.

The upper part of the trough 21 is covered by a cover 24 extending from the rotary table 5.
The grease used in the power transmission system 15 above does not get into the inside of the power transmission system 15. As shown in FIG. 5, the cover 24 includes a mounting ring 25 fixed to the flange portion 9 of the rotary table 5, stands 26 extending upward from the mounting ring 25 and arranged at intervals in the circumferential direction, and a mounting ring 25 fixed to the flange portion 9 of the rotary table 5. A conical cover main body 28 attached via an arm 27, a guide plate 29 having a U-shaped cross section welded to the lower end of the cover main body 28, and a trough provided extending from the guide plate 29 into the trough 21. It consists of a stirring plate 30 that prevents dust from accumulating at the bottom. Also,
This cover 24 is divided into a plurality of parts in the circumferential direction. Note that 31a, 31b, 31c, and 31d are heat insulating materials affixed to the inside of the furnace of the rotary table 5;
33 is the rotary table 5 from the casing cover 1b.
This is a baffle plate that extends downward and is located inside the

Incidentally, in such a bellless furnace top charging device, a power transmission system 15 for rotating the distribution chute 2 connects the casing 1 and the rotary table 5.
is arranged in a space S between the power transmission system 1 and
5. It is necessary to take sufficient care to avoid the influence of the furnace gas, which is high in temperature and contains a large amount of dust.

In the conventional bell-less furnace top charging device shown in FIGS. 3 to 5, the following measures are taken to prevent the furnace gas from flowing into the space S.

That is, a seal plate 34 is sandwiched between the flange portion 9 of the rotary table 5 and the mounting ring 25 of the cover, and the outer peripheral end of the seal plate 34 is attached to the inner peripheral side wall of the trough 21 at an appropriate distance from each other. It is loosely fitted between the provided ring-shaped protrusions 35, 35.

In other words, the path from the furnace space to the space S where the power transmission system 15 is arranged is bent, thereby making it difficult for the furnace gas to flow into the space S.

``Problems that the invention attempts to solve'' However, the gas seal device described above only increases the gas flow resistance by bending the path, and although it is sufficiently effective in small blast furnaces, For example, in the case of a large blast furnace with an internal volume exceeding 4000 ^m3 , the gas turbulence in the furnace space is much greater than in a small blast furnace. High temperature gas tends to continue to enter the space S through the seal portion. As a result, the atmospheric temperature in the space S may reach 100℃ or more, and the amount of dust contained in the gas is much larger than in the case of a small blast furnace, so there is a risk of machine damage. No countermeasures have been taken.

In addition, with the above-mentioned conventional gas seal device, when a high temperature load is applied to the top of the furnace, such as when the blast furnace slips and causes a blow-through,
There is a risk that the rotary table 5 will undergo thermal expansion and the seal plate 34 will come into contact with the inner side wall of the trough 21, making it impossible to rotate, ie, unable to charge the raw material.

This invention attempts to overcome these conventional drawbacks.

"Means for solving the problem" In this invention, a rotary table is installed in the casing at the top of the blast furnace so that it can rotate freely in the horizontal direction, and by rotating the rotary table, the distribution chute attached to the rotary table can be rotated. A gas sealing device between an inner periphery of a casing and an outer periphery of a rotary table in a top distribution chute drive device of a blast furnace, wherein the inner periphery of the casing and the outer periphery of the rotary table, which face each other at the bottom of the drive device, A ring-shaped trough having an opening above is provided so as to extend all the way around the inner circumference, and a cover body is provided that covers the upper opening of the trough so as to extend all the way around the remaining other side, and the cover body trough water level control means for controlling the water level in the trough to be above the lower end of the partition plate inserted therein; It is characterized by the fact that it has been established.

"Operation" By inserting the partition plate extending from the cover body into the trough so as to be below the water level, a water seal is created between the outer circumference of the rotary table and the inner circumference of the furnace top casing. Therefore, as long as this water seal is not broken, the furnace gas will not enter the space formed between the outer circumference of the rotary table and the inner circumference of the casing through that part, and a reliable seal will be maintained. can be realized.

"Embodiment" An embodiment of this invention will be described below with reference to FIGS. 1 and 2. Note that the same components as those explained in the conventional example are given the same reference numerals, and the explanation thereof will be omitted.

In this example, the rotary table 5 is rotatably supported by a bearing 14, and the distribution soute is rotated by rotationally driving the rotary table 5 by a power transmission system 15. 31d, while cooling panels 20a and 20b are arranged on the inner circumferential side of the casing,
The cooling panels 20a, 2 are supplied with water through the water supply nozzle 17 into the ring groove 12 on the upper part of the rotary table 5.
The structure in which the rotary table 5 and the space S outside it are cooled through the rotary table 5 and the space S outside it is received by the trough 21 and discharged to the outside is the same as that of the conventional example shown in FIGS. 3 to 5. be. The feature of this example is that the seal plate 34 of the conventional example is abolished, a special cover 40 is used in its place, and a water retention level adjusting means 50 is provided to keep the water level in the trough 21 constant.

Regarding the cover 40, a ring-shaped mounting bracket 41 is attached to the flange portion 9 at the lower part of the outer periphery of the rotary table 5 by fixing means such as bolts (see FIG. 2). The mounting bracket 41 is provided so that its outer periphery extends above the inner peripheral side wall 21a of the trough 21, and its tip is bent downward and positioned within the trough. A conical cover body 42 that covers the upper opening 21b of the trough 21 is welded to the upper part of the outer peripheral end of the mounting bracket 41 so that the enlarged diameter side faces upward. A ring-shaped partition plate 43 is provided extending from the center of the lower part of the cover body 42 to near the bottom of the trough where the tip thereof is below the water level of the trough 21. Partition plate 4 on cover body 4
Piping 22 extending from the cooling panels 20a, 20b is provided in a penetrating state further to the outer peripheral side than the part where the cooling panels 3 are attached, so that the water after passing through the cooling panels 20a, 20b flows into the trough 21. .

The mounting fittings 41, the cover body 42, and the partition plate 43 are divided into a plurality of parts in the circumferential direction, and these parts are spaced at appropriate intervals (for example, about 2 to 3 mm, this value depends on the outer diameter, thickness, and number of divisions of the cover 40. (depending on the location) and the gaps are filled with filler such as paste.
The purpose of this arrangement is to absorb thermal expansion of the cover 40. A one-piece ring-shaped sheet packing 44 is fixed to the upper part of the cover body 42 and the mounting bracket 41 by a stop plate 45 at the upper part.

On the other hand, to explain the trough water level control means 50, a pipe 51 extends outward from the outer side wall 21c of the trough and is provided to penetrate the mantel 32, and a water level control tank 53 is connected to the tip thereof. The lower part of the control tank 53 is partitioned into two chambers by a partition plate 54 that extends upward from the bottom to a predetermined height, and one of the chambers 53a is connected to the pipe 51.
The other chamber 53b is connected to a drain pipe 55 leading to the outside. Water flowing from the trough 21 side via the pipe 51 flows into the chamber 53a, passes over the upper end of the partition plate 54, reaches the chamber 53b, and is discharged from there to the outside through the drain pipe 55. The water level in the trough 21 can be determined by adjusting the height h of the partition plate 54. It is set to be below the upper end of 21a.

Further, the inside of the tank 53 is communicated with the space S via a communication pipe 57 whose one end passes through the lid 56 and whose other end passes through the casing 1. The tank 53 is connected to the space S in this way.
This is to prevent the water level in the trough 21 from being unable to be maintained at a desired level when the pressure inside the trough 3 and the space S changes. Note that 58 indicates a seal portion of the pipe penetration portion.

Therefore, with the above gas seal device, the space S in which the power transmission system 15 is housed with respect to the furnace interior space is
is a trough 21 whose lower part extends from the casing 1;
A cover 40 extending from the rotary table 5 to the trough 21 side, a seat packing 44, and a partition plate 43 whose lower end is submerged below the water surface of the trough make it airtight, and a baffle plate 3 whose upper end extends from the casing cover 1b.
3. Projections 10a and 11 on the upper part of the rotary table that are loosely fitted into the ring groove on the lower surface of the casing cover 1b.
A and the bearing 14 keep the space relatively airtight, making it extremely difficult for furnace gas to enter the space S. Therefore, the power transmission system 15 housed in the space S can be protected from the heat of the furnace gas and dust. Also, suppose that the gas in the furnace is in the trough 21.
Even if the water seal inside the trough 21 is broken and the gas flows into the space S, the gas is cooled while passing through the water in the trough 21 and at the same time the dust contained therein is removed. The influence of the transmission system 15 is extremely small.

It should be noted that the water level control means 50 shown in the above embodiment is merely an example, and other means may be used, such as interposing an on-off valve in the piping and providing a sensor for detecting the trough water level, based on the output signal from the sensor. A structure that maintains the trough water level constant by controlling the on-off valve may also be used. However, it is not preferable to move the connection port of the pipe 51 extending from the trough 21 upward in accordance with the water level because it becomes difficult to discharge dust and the like that accumulate at the bottom of the trough.

"Effects of the invention" As explained above, this invention provides the following various excellent effects.

A trough is provided to extend all the way around the inner periphery of the casing between the inner periphery of the casing and the outer periphery of the rotary table, and a cover body is provided to cover the upper opening of the trough and extend all the way from the other side. By providing a partition plate that extends downward from the cover body and whose lower end is submerged under the water surface of the trough, the lower part of the space accommodating the power transmission system 15 formed between the casing and the rotary table can be separated from the furnace. It is kept airtight against the inner space, and
Furnace gas can be prevented from entering the space inside the casing. As a result, even in large blast furnaces, the power transmission system housed inside the casing can be protected from the heat and dust of the furnace gas, increasing the durability of the power transmission system.
Maintainability can be improved.

Furthermore, even if the furnace gas were to break the water seal between the trough and the partition plate and flow into the casing internal space S, the gas would be cooled while passing through the water in the trough, and the dust contained therein would be removed. Therefore, the effect of the gas on the parts of the swing drive device is extremely small.

Furthermore, since the seal ring shown in the conventional example is not used, even if the rotary table thermally expands during high-temperature loads caused by slips, etc.
Parts attached to the rotary table do not come into contact with parts on the casing side, and inconveniences such as inability to rotate can be prevented.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of this invention; Figure 1 is a half-sectional view of the upper part of the blast furnace, Figure 2 is a perspective view of a part of the cover, and Figures 3 to 5 are conventional examples. 3 is a sectional view of the upper part of the blast furnace, FIG. 4 is a half sectional view illustrating the rotary chute drive device, and FIG. 5 is a perspective view of a part of the cover. 1...Casing, 2...Distribution chute, 3...
... Drive device, 5 ... Rotary table, 12 ... Ring groove, 14 ... Bearing, 15 ... Power transmission system, 20
a, 20b...Cooling panel, 21...Trough, 3
2... Mantel, 40... Cover, 41... Mounting bracket, 42... Cover body, 43... Partition plate, 4
4... Seat packing, 50... Trough water level control means, 53... Water level control tank, 54...
...Partition plate, 55...Drain pipe. 57...Communication pipe.

Claims (1)

[Scope of utility model registration request] A rotary table equipped with a water-cooled cooling device is installed horizontally in a casing at the top of the blast furnace, and by rotating the rotary table, a distribution chute attached to the rotary table is rotated. A gas seal structure between an inner periphery of the casing and an outer periphery of the rotary table in a distribution chute drive device, wherein the inner periphery of the casing and the outer periphery of the rotary table, which are opposite to each other at the lower part of the drive device, include the entire circumference of the inner periphery of the casing. a ring-shaped trough having an opening at the top so as to extend over the entire circumference; a cover body covering the upper opening of the trough extending from the remaining other side over the entire circumference; a ring-shaped partition plate reaching near the bottom of the trough, and trough water level control means for controlling the water level in the trough to be above the lower end of the partition plate inserted therein. A gas seal structure for the drive device of the top distribution chute of a blast furnace.