JPS5910122Y2 - Airtight door of atmosphere heating furnace - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an airtight door for an atmospheric heating furnace that makes it possible to reduce the amount of atmospheric gas used, improve the temperature distribution in the furnace, and eliminate the need for a lifting device attached to the door.

In a conventional atmosphere heating furnace, as shown in the side sectional view of FIG. 1 and the front view of FIG. 2, when the steel plate 107 is heated in the furnace, N2 gas or H2 gas etc. are sealed in the furnace, and a door 1 for sealing these sealed gases (atmosphere gas)
01 can be raised and lowered by a lifting device 104 located at the front and rear of the furnace.

Although the furnace shell 110 has a structure with no gaps, the pressure of the sealing gas is increased to about 0.5 to 3 mmAq in case cracks occur due to some reason.

In addition, in FIG. 1, 102 is a seal box, 10
3 is counterway l-, 105 is chain, 106
is Hoi Nore, and 111 is Scar 1.

When the furnace is operated with the above structure, the steel plate 107 is placed on the roll 108 and moves from the left to the right in the direction of the arrow X in FIG.

On the other hand, the furnace operator directly or on industrial television said that the steel plate 1
07, and when the front end of the steel plate 107 begins to enter the furnace, the door 101 is raised and opened.
It is held at a height that does not touch the steel plate 107.

That is, the door 101 is normally opened approximately 30 mm higher than the upper end surface of the steel plate 107 in consideration of the deformation of the steel plate 107.

The steel plate 107 continues to move further and the steel plate 1
When it is recognized that the rear end of the vehicle 07 has reached further to the right of the door 101, the door 101 is lowered and closed.

In such an operation of the door 101, when the door 101 starts to open, as is clear from FIG.
7, the door 101, and the roll 108, and a gap W between the door 101 and the roll 108 on both sides of the steel plate 107, and from the time the door 101 is opened, the gas sealed in the furnace flows through these gaps. ■Starts leaking from and W, door 10
1 is open, the gas continues to leak.

This leakage of the sealed gas is particularly disadvantageous when the steel plate 107 is thick.

In other words, the steel plate 107, which has a large thickness, is generally made to have a narrow plate width due to its relationship with the rolls 108. Therefore, the gap on both sides of the steel plate 107 increases, and the leakage of the filled gas increases. The quantity will increase.

As mentioned above, by opening the door 101 in order to charge the steel plate 107 into the furnace or extract it from the furnace,
When the sealed gas inside the furnace leaks, the pressure inside the furnace decreases, and when the high-temperature, low-density sealed gas leaks, external air enters to replace it, increasing the 02 concentration inside the furnace.

If the steel plate 107 is heated in this state, oxide scale will be generated on the steel plate 107 and further damage the roll 108. Conventionally, when the door 101 is opened, a large amount of non-oxidizing gas, that is, atmospheric gas, is blown into the furnace. Prevents air from entering.

However, as mentioned above, a large amount of ambient gas at room temperature or lower temperature is applied to the steel plate 107 heated at an internal furnace temperature of 900°C and the refractory insulation material 109 inside the furnace exposed to the same temperature. Injecting heat into the furnace will result in temporary or local rapid cooling, which is very harmful, and the amount of human heat inside the furnace must be increased due to the cold gas mentioned above, resulting in a large thermal loss. .

To summarize the above, the conventional atmosphere heating furnace door has the following drawbacks.

(1) The amount of gas sealed in the furnace leaking from the door opening is enormous and uneconomical.

(2) A large amount of atmospheric gas is supplied when the door is opened, which worsens the temperature distribution inside the furnace and causes local cooling of the steel sheets and refractories inside the furnace, which reduces the quality of the steel sheets and shortens the life of the furnace. is also shortened.

(3) Large-capacity atmospheric gas blowing equipment is required to ensure a large supply of atmospheric gas when the door is opened.

(4) Due to the large amount of atmospheric gas replenishment, the furnace temperature decreases, heat loss increases, and thermal efficiency decreases.

The present invention solves the above-mentioned drawbacks of the conventional equipment, and provides an airtight door for an atmospheric heating furnace that reduces the amount of atmospheric gas used, improves the temperature distribution in the furnace, and eliminates the need for a lifting device attached to the door. The gist of what is provided is:
A door body is made by dividing a thin steel plate into a plurality of pieces, and connecting the divided thin steel plates with bellows to form an integrated door body, which is attached to the furnace shell using a hinge mechanism for each of the divided thin steel plates. This airtight door for an atmospheric heating furnace is characterized in that wire brushes corresponding to the lower portions of each divided thin steel plate of the main body are brought into close contact with each other and are attached to the furnace shell in a height-adjustable manner.

Next, the present invention will be explained with reference to the drawings.

FIG. 3 is a side sectional view of one embodiment of the present invention, and FIG. 4 is a front view of the embodiment of FIG.

The airtight door of the present invention is installed at the front and rear steel plate entrances of an atmospheric heating furnace, which is formed by a furnace shell 9 that surrounds a plurality of rolls 7 with a fireproof insulating material 8 and prevents atmospheric gas from leaking to the outside. This is to maintain airtightness inside the furnace.

That is, in the airtight door of the present invention, a door body 1 is formed by dividing a thin steel plate into a plurality of pieces, and connecting the divided thin steel plates 1a to each other with bellows 2 to form an integrated door body 1.
Each wire brush 4 is attached to the furnace shell 9 by a hinge mechanism using a rod 3, and the corresponding wire brush 4 is closely attached to the lower part of each divided thin steel plate 1a of the door body 1.
The height of the furnace shell 9 can be adjusted via the brush mounting bracket 5.
This is a precept that has been established.

The hinge mechanism is sealed with an asbestos force bar 10 fixed to a seal force bar 11.

The height of the wire brush 4 is adjusted so that the door body 1 can be easily reversed when the steel plate 12 is reversely fed.

The operation of this structure will be described.

In FIG. 3, the steel plate 12 moves from the left to the right along the roll 7'', and the steel plate 12 hits the door body 1 and pushes it up.

As mentioned above, the door body 1 is made up of a plurality of divided thin steel plates 1a, and since it is attached by a hinge mechanism, the advancing steel plate 12 is divided into a number corresponding to the width of the plate. The steel plate 12 easily pushes the thin steel plate 1a, and the steel plate 12 itself continues to move to the right while contacting the wire brush 4.

The parts where the bellows 2 is open are divided thin steel plates 1a corresponding to both sides of the steel plate 12.

The bellows 2 does not open in the divided thin steel plates 1a that are bent by the pressure of the portion through which the steel plate 12 passes, and the lower part of the divided thin steel plates 1a constantly covers the surface of the steel plate 12 while the steel plate 12 is passing through. Since it is in contact with the surface, a good seal can be obtained, and at the same time, the lower part of the divided thin steel plate 1a that is not pushed up by the steel plate 12 is in close contact with the corresponding wire brush 4, so that the same You can get an excellent seal.

After passing through the steel plate 12, the divided thin steel plate 1a of the door body 1 becomes vertical due to the round bar-shaped weight 13 attached to its lower end, and the bellows 2 closes and fits inside the wire brush 4, thereby making the door body 1 vertical. is in a closed state.

As is clear from the above, by appropriately dividing the door body 1, a variable opening door having an opening equal to or slightly wider than the width of the steel plate can be obtained. It is possible to significantly reduce the large amount of outflow of the sealed gas when the conventional door is opened.

In addition, the upper part of the door body 1 is loosely attached with a hinge mechanism using the rod 3, so even if the steel plate moves from left to right or from right to left, it can be rotated easily. By covering the top with the asbestos force bar 10, sufficient sealing performance can be provided.

Further, a wire brush 4 is in close contact with the lower part of the door body 1 to ensure a seal below the steel plate 12 when the steel plate 12 is advanced and a seal below the door body 1 when the door body 1 is closed.

In addition, since this wire brush 4 becomes short due to wear, the brush mounting bracket 5 is divided into multiple parts to adjust the brush position adjustment bolt l.
- Its height can be adjusted by 6.

There is no gap between the sides of each divided thin steel plate 1a of the door body 1 due to the bellows 2, but as mentioned above, when the door body 1 is opened, the divided thin steel plates 1a corresponding to both sides of the steel plate 12 are closed. Bellows 2 opens.

In this way, in the conventional example, when the door 101 is opened, it is completely open in the width direction of the door 101, and also in the height direction.
Since the door 101 was completely opened by adding a slight margin to the thickness of the steel plate, and the door 101 had been opened before the steel plate 107 advanced, a large amount of the filled gas leaked out. However, in the present invention, the opening area is By reducing the amount as much as possible, these drawbacks could be solved.

The effects of the present invention are as follows.

(1) The amount of sealed gas flowing out from the door opening when passing through the steel plate is significantly reduced, and the economic effect is large.

(2) When the door is opened, the temperature of the sealed gas does not drop due to the inflow of outside air, improving the temperature distribution in the furnace and improving the quality of the steel plate.

(3) The capacity of the atmospheric gas supply equipment can be reduced.

(4) Since the opening and closing operations of the door are no longer necessary, an elevating device attached to the door is no longer necessary, and it can be easily installed even in narrow spaces.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of an example of a conventional atmosphere heating furnace;
The drawings are a front view of the conventional example shown in FIG. 1, FIG. 3 is a side sectional view of one embodiment of the present invention, and FIG. 4 is a front view of the embodiment shown in FIG. In the figure, 1...door body, 1a...
・Divided thin steel plate, 2... Bellows, 3...
... Rod, 4 ... Wire brush, 5 ...
... Brush mounting bracket, 6 ... Brush position adjustment bolt, 7 ... Roll, 8 ... Fireproof insulation material, 9 ... Furnace shell, 10...Asbestos force bar, 11...Sealing force bar, 12...
...Steel plate, 13...Way 1-, 14...
...Brush holder, 101...Door, 1
02... Seal box, 103...
Counterweight, 104... Lifting device, 1
05...Chain, 106...Puno, 107...Steel plate, 108...Roll, 109...Fireproof insulation material, 110...・・・・・・
Furnace shell, 111... To Scar 1, ■, W...
··gap.

Claims (1)

[Scope of utility model registration request] A door body is formed by dividing a thin steel plate into a plurality of parts, and connecting the divided thin steel plates to each other with a bellows, and attaching each divided thin steel plate to the furnace shell using a hinge mechanism, and the door body. An airtight door for an atmospheric heating furnace, characterized in that wire brushes corresponding to the lower parts of each of the divided thin steel plates are closely attached to the furnace shell and are height-adjustable.