JPS63109117A - Continuous type heating furnace - Google Patents

Abstract

PURPOSE:To prevent energy loss at the time of charging material by arranging side sealed member at the lower part of charging hole door of a furnace, shifting along horizontal direction and shutting out a gap formed at the side part of material. CONSTITUTION:At the time of carrying a slab 10 into the continuous type heating furnace 12, by working a cylinder piston 28, the charging hole door 22 is raised to open the charging hole 18 and the slab 10 is carried into the charging hole 18. Next, by driving piston cylinders 38, 48, the side sealed doors 34, 36 are retreated. And, by driving the piston 28, the charging hole door 22 is lowered so that the lower end part of the door body 24 approaches, the upper surface of slab 10. In succession, the pistons 38, 48 are driven to the position, where the side sealed doors 34, 36 touches the side faces of slab 10, and spaces formed at the side faces of slab 10 are shut out by the side sealed doors 34, 36. By this mechanism, the heat in the furnace at the time of charging the slab 10 in the furnace 12 can be sustained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a continuous heating furnace that continuously heats a metal material such as a slab steel material before rolling it.

[Prior Art] For example, a slab cast by a continuous casting machine is transported to a continuous heating furnace to facilitate rolling, where it is heated to a predetermined temperature, and then rolled (irrigated into a cast iron). A gas burner is placed in the continuous heating furnace to directly heat the slab and maintain the atmosphere inside the heating furnace at a high temperature.

The heating furnace is provided with a charging port into which a steel slab to be heated is charged, and an extraction port through which the heated slab is taken out. The charging port is equipped with a charging port that opens when charging the slab into the continuous heating furnace, and when the slab is not charged, the charging port is closed to prevent the heat inside the furnace from escaping from the charging port or vice versa. This prevents cold outside air from entering. The extraction port is also equipped with a door, similar to the charging port, which opens when the heated slab is extracted, and closes when not extracted to maintain heat in the furnace.

[Problem that the invention seeks to solve] However,
In conventional continuous heating furnaces, when the charging port door is opened, the heat inside the furnace escapes as the slab is charged, or
There is a problem in that it allows cold outside air to enter, resulting in energy loss. In other words, when charging slabs into the furnace through the charging port, even if the charging port door is raised by the thickness of the slab, a gap will be formed on the side of the slab at the charging port. It will be done. Conventional continuous heating furnaces have a problem in that heat within the furnace is released to the outside through such gaps, resulting in energy loss.

This invention was made in view of the above circumstances, and an object of the present invention is to provide a continuous heating furnace that can prevent energy loss when charging metal materials.

Means for Solving Problem c] The continuous heating furnace according to the present invention is a continuous heating furnace that sequentially takes in metal materials from a charging port and heats them, and the charging port has a charging port that rises and opens. A door is provided, and at the bottom of the charging port door there is a side seal that moves in the horizontal direction when metal material is taken in and shields the gap formed on the side of the metal material in the charging port. It is characterized by comprising a member.

[Function] According to the continuous heating furnace of the present invention, when loading a metal material into the continuous heating furnace, the charging port door is raised to open the charging port, and the side seal member closes the width of the metal material. It moves according to the dimensions and covers the gap formed on the side of the metal material at the charging port.

This prevents the flame or high-temperature atmosphere inside the furnace from escaping to the outside through the gap when taking in the metal material, and conversely prevents cold outside air from entering.

[Embodiment 1] An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3 of the accompanying drawings.

As shown in FIG. 3, a walking beam continuous heating furnace 12 continuously heats a slab 10 as a metal material.
is provided with a transport path 14 for transporting the slab 10, and the furnace body 16 is provided with a transport path 14 for transporting the slab 10 to be heated.
A charging port 018 into which 0 is charged and an extraction port 20 through which the heated slab 10 is extracted are formed.

Suspended from the charging port 18 is a charging port 22 which is normally closed and rises to open the charging port 018 when charging the slab into the furnace. A burner 21 is disposed inside the heating furnace 12 along the conveyance path 14 to heat the inside of the furnace. The pressure inside the continuous heating furnace 12 is normally set to about 2 mmH2O higher than the outside pressure.

As shown in FIG.
The script body 24 is suspended from a pair of chains 26, and one end thereof is connected to a cylinder piston 28. This charging port rn22 is normally closed, and when the slab 10 is introduced into the furnace, it is moved upward and charged into the charging port rn22.
Open 8.

On the other hand, rails 30.32 extending along the horizontal direction are provided at the lower end of the script body 24, and each rail 30.32
has a pair of side seal doors 3 that can be moved along this
4.36 is slidably mounted. The side seal doors 34 and 36 seal the space formed on the side of the steel material when the steel material is charged into the furnace. One side seal ridge 34 is connected via a pair of shafts 40, 42 to a piston cylinder 38 for moving it along the rail 30. Similarly, the other side seal door 32 also connects the piston cylinder 4 via the shaft 44.46.
It is connected to 8.

On the other hand, at the bottom 50 of the charging port 18, walking beams 52 and fixed bars 53 for conveying steel materials into the furnace are arranged alternately. The steel materials are sequentially transported into the furnace by being lifted from the container and then moved horizontally along the transport direction. The walking beam 52 and the piston cylinder 38 are each connected to a control device (not shown) and are configured to operate in synchronization with an operation signal from the walking beam 52.

Next, the operation of the embodiment of this invention will be explained.

When the slab 10 is transported to the continuous heating furnace 12 along the transport path 14, the cylinder piston 28 is actuated to raise the charging port door 22 and open the charging port 18. As shown in FIG. 3, the slab 10 is conveyed to the charging port 18 by a charging roller table and a charging table.

Next, the piston cylinders 38 and 48 are driven, and the side seal doors 34, 36 are retracted to a position corresponding to the width of the filler insert 018, as shown by reference numeral A in FIG.

Next, drive the piston 28 to lower the charging port door 22,
The lower end of the door body 24 is located close to the upper surface of the steel slab. In this case, a small gap is formed between the lower end of the script body and the surface of the slab 10 so that the slab 10 is lifted by the walking beam 52 when the slab is transported. In this case, a space is formed between the ia edge wall surface 0 and the script body 24 on both sides of the slab 10.

Next, the pistons 38, 48 are driven until the side seal sleeves 34, 36 press against the sides of the slab 10. Therefore, the space formed on the side of the slab is occupied by the side seal door 34.
．． As shown in FIG.
4.36, and is reliably shielded by the steel slab 10. Therefore, the heat inside the furnace is maintained when the steel material is charged into the furnace.

In this case, the length of the transported slab varies as shown in Figure 2, but since the side seal door is movable, the length of the transported slab varies depending on the length of the slab of steel to be charged. By adjusting the amount of movement thereof, the charging port 18 can be shielded from steel materials of various sizes.

When the slab passes through the charging port 018 and there is no next slab, the side seals 34 and 36 move to the retracted position A and the script body 24 closes the charging port 18 inadvertently.

As shown in FIG. 3, the slab 10 moves along a conveyance path 14, passes through a pre-heating zone, a heating zone, and a soaking zone in order to be sufficiently heated, and progresses through the continuous heating furnace while being soaked. .

When the slab 10 after soaking approaches the extraction port 20, the extraction lip 54 rises and the extraction port 20 opens. In this case, the heated steel material is taken out of the heating furnace by a beam slab extractor (not shown), placed on a transport roller table, and transported to the next step.

According to this embodiment, when charging the steel material into the furnace, the charging port can be shielded to prevent energy loss due to air intrusion or during the release of heat in the furnace. , approximately 2000 Kcal (kilocalories) of energy can be saved per ton of slab.

This invention is not limited to the one embodiment described above, and can be modified in various ways without departing from the gist of the invention.

For example, the drive source for driving the side seal door is not limited to an air cylinder, but also an electric power cylinder, or the same effect can be obtained by connecting the script body and the side seal door with a rack/binion without using a rail. .

Further, in the above-described embodiments, a walking beam type continuous heating furnace was explained as an example, but the present invention is not limited to this, and similar effects can be obtained with a walking hearth type heating furnace or the like.

Further, a door having the same structure as the charging opening may be attached to the extraction lip as well. In this case, further energy loss within the furnace can be prevented.

[Effects of the Invention] According to the continuous heating furnace of the present invention, the space formed at the side of the metal material at the bottom of the zero charging bank can be sealed with a sealing member, so that the metal material can be kept inside the furnace. When charging the furnace, the metal material can be taken in while the charging port is reliably shielded and the inside of the furnace is isolated from the outside air. Therefore, it is possible to prevent the flame or high-temperature atmosphere in the furnace from dissipating, or to prevent cold outside air from entering, thereby preventing energy loss.

[Brief explanation of the drawing]

FIG. 1 is a front view of a charging port door used in a continuous heating furnace according to an embodiment of the present invention, FIG. 2 is a plan view illustrating the operation of the charging port shown in FIG. 1, and FIG. The figure is a schematic sectional view of a continuous heating furnace according to an embodiment of the present invention. 12... Continuous heating furnace, 18... Charging port, 22...
- Loading port door, 24... script body, 34.36... side seal door.

Claims (1)

[Claims] In a continuous heating furnace that sequentially takes in metal materials from a charging port and heats them, the charging port is provided with a charging port door that rises and opens. 1. A continuous heating furnace characterized by comprising a side seal member that moves horizontally during loading and shields a gap formed on the side of a metal material at a charging port.