JPS5835570B2 - Walking beam furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a walking beam type insulating furnace and heating furnace.

Modern steel mills are aiming to save energy, labor, and increase efficiency by making processes continuous, and the line from the continuous casting equipment to the rolling mill is no exception, and the line between the continuous casting equipment and the rolling mill is no exception. A heat retention furnace or a heating furnace, or a heat retention furnace and a heating furnace are interposed in order to make the work continuous.

Incidentally, there is a large difference between the continuous casting speed and the rolling speed, and therefore each furnace is required to act as a buffer zone to absorb the difference in throughput between the two processes as much as possible.

That is, there is a need for a furnace that can simultaneously charge materials from the casting process side in accordance with the charging conditions without changing the extraction pitch of the material to the rolling process side.

Furthermore, it is of course necessary to shorten the furnace length.

Against this background, various types of furnaces that satisfy these requirements have been proposed in the past.For example, a heat-retaining furnace is described in Japanese Patent Application Laid-open No. 52-109428, and a heating furnace is described in Japanese Utility Model Publication No. 46-23291. No., Japanese Patent Publication No. 52-1094
No. 12, JP 53-118210, JP 53-1429
06 and 5371609, etc.

Although there are some differences in the furnace types proposed in these public laws, basically the walking beam of the conventionally known walking beam furnace has multiple divided bands in the furnace length direction, and each divided beam is independently separated. It can be driven vertically and horizontally.

The inventor of the present invention has conducted various studies on this walking beam splitting furnace and has found that it still has the following drawbacks.

(1) In order to shorten the furnace length, when there is an empty furnace between the trailing end material of the leading manpower and the charging port, the trailing manpower can be charged without disturbing the extraction pitch of the leading manpower. It is necessary to follow and convey the empty furnace section to catch up with the rear end material.

The length of the empty furnace section between the leading and trailing materials that can be tracked by this chasing is the length of the split beam.

This is because there are cases where the trailing edge material of the advance manufacturing staff is located across the front and rear split beams, and in this case, if you try to follow the trailing edge material above, this trailing edge material will fall over, so this can be prevented. This is because the split beam on which the trailing material is placed is not used for transporting the trailing production personnel.

Therefore, in order to effectively utilize the furnace length and shorten it,
It is necessary to reduce the length of the split beam.

In this case, the number of divisions increases. (2) As is well known, the walking beam of a walking beam furnace has an oval shape in the hearth, with a horizontal beam inside the furnace supported by an upright post passing through an elliptical opening, and a post outside the furnace supporting the vertical beam. It is made by connecting vertical and horizontal drive mechanisms.

Therefore, the increase in the number of divisions means that the formation of an ellipse means an increase in the number of openings in the elliptical hearth, as well as an increase in the vertical and horizontal drive mechanisms. decreases, the energy saving effect of the heating furnace decreases, and the equipment cost of the furnace increases as the number of aperture sealing mechanisms and the number of beam drive mechanisms increase.

The present invention has been made in view of the above-mentioned drawbacks of conventional furnaces, and the present invention divides the beams placed between the walking beams without dividing the walking beams, and makes the divided beams movable up and down. This idea was created based on the idea that if the lifting and lowering strokes were appropriately selected in relation to the stroke of the walking beam, it would be possible to maintain the same functionality as a conventional walking beam split furnace and eliminate the above-mentioned drawbacks. The gist of the walking beam furnace of the present invention is that the beam placed between the walking beams is divided into multiple parts in the furnace length direction, each of the divided beams can be raised and lowered individually, and the upper limit of each divided beam is set higher than the upper limit of the walking beam. The goal is to make it more expensive.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be explained in detail below with reference to the drawings.

Figure 1 is a longitudinal sectional view of the furnace of the present invention, and Figure 2 is A of Figure 1.
-A sectional view.

In the drawing, 1 is a furnace shell, 2 is a walking beam frame arranged in the furnace length direction at the bottom of the bottom, and 3 is this frame 1.
This is a walking post that is planted above the hearth 4 and supports a walking beam 6 that extends in the furnace length direction and is positioned inside the furnace through a hearth opening 5 provided in the hearth 4.

As is well known, the hearth opening 5 has an oval shape that is elongated in the lengthwise direction of the hearth.

7 is a walking beam lift cylinder that moves the beam 6 up and down via a lift transmission mechanism 10 such as a rod 8 and a cam 9, the frame 1, and the post 3; 11 is a walking beam lift cylinder that moves the beam 6 up and down via the frame 1 and the post 3; This is a walking beam traverse cylinder that moves horizontally in the furnace length direction.

Reference numeral 12 denotes a split lift beam in which a conventional fixed beam placed between the walking beams 6 and 6 in the furnace width direction is divided into a plurality of (13 in this example) divided bands in the furnace length direction and the divided beams can be raised and lowered. It is.

This split lift beam 12 is connected to a lift beam frame 13 disposed below the hearth 4 in the furnace length direction.
A lift beam 15 that passes through a hearth opening 14 provided in a hearth 4 planted above and is located inside the furnace and supports a lift beam 12 at its tip, and a lift cylinder 16 connected to the lower part of the frame 13. Therefore, the beam 12 can be moved up and down by the cylinder 16.

Note that the opening 14 has the same cross-sectional shape as the post 15 described above.

In addition, in the furnace of the present invention, in order to maintain a buffer property equivalent to that of the conventional walking beam split furnace, the lift beam is adjusted such that the lift limit of the lift beam 12 is higher than the lift limit of the walking beam 6 by the lift transmission mechanism 10. The stroke of the cylinder 16 is designed.

If the stroke is designed in this manner, only the charging material group that is desired to be charged and transported can be transported by the walking beam 6 by lifting the charging material group that is not desired to be transported into the furnace.

There is no particular limit to the lowering limit of the stroke, but in this embodiment the stroke is designed to be slightly higher than the lowering limit of the walking beam 6.

Therefore, the charging material on the lift beam 12 located at the lower limit can be received by raising the walking beam 6.

In Fig. 1, 17 and 18 are the charging port and extraction port of the furnace,
In this example, a charging mechanism consisting of an entry beam that extends from just before the charging port 17 to the walking beam position in the furnace, a pusher that pushes the charging material along this beam, and a charging mechanism that is located outside the extraction port 18 is used. Illustrations of extractors and the like are omitted.

An example of how to operate the walking beam furnace configured as described above will be described.

First, in FIG. 1, 19 is the preceding material group located in the furnace on the side of the extraction port 18, 20 is the last charging material of the preceding material group 19, and 2
1 is the trailing material group located in the furnace on the side of the charging port 17, 22 is the lead material at the head of the trailing material group, and 23 is the empty furnace section that occurred between the charging material 20 and the same 22. ing.

The preceding material group 19 is kept warm or heated in the furnace and extracted at a constant extraction pitch, and is conveyed by the walking beam 6 at a constant pitch and by a constant furnace length pitch.

It is assumed that the next material group 21 does not exist in the furnace and the furnace is empty from the last charging material 20 of the preceding material group 19 to the charging port 17, and that the girder material group 21 arrives at the charging port 17 in the future. .

In this case, the group of lift beams 12 on which the group of materials 19 is located is raised to its upper limit between the conveyance pitches of the preceding group of materials 19.

As a result, even if the walking beam 6 is raised, it will not receive the group of materials 19.

In this state, the trailing material group 21 is sequentially charged into the furnace and transported through the furnace by the walking beam 6.

In this way, it is possible to charge according to the charging conditions without changing the extraction pitch.

Now, in order to make the trailing material group 21 catch up with the preceding material group 19 in the situation shown in FIG. The 12th group is brought to its upper limit, and then the lift cylinder 7 of the walking beam 6 is driven upward to raise the group 21.
is received from the lift beam 12 group at the lower limit, and then the traverse cylinder 11 is horizontally driven toward the extraction port, and then the cylinder 7 is driven downward, and then the cylinder 11 is horizontally driven toward the charging port. The material group 21 can catch up to the material group 19 without changing the extraction pitch of the group 19 on the 18 side, and the empty furnace section in the furnace can be minimized, and the material can be subsequently charged near the charging port 17. It is possible to form an empty furnace section that accommodates a group of

In this way, the succeeding material group can catch up with the preceding material group in the furnace without changing the extraction pitch, so the furnace length can be effectively utilized.

Therefore, the furnace length can be shortened to the minimum.

As described above, the walking beam furnace of the present invention has the same buffer function as the conventional walking beam splitting furnace.

Furthermore, compared to conventional walking beam splitting furnaces, the walking beam furnace of the present invention is extremely advantageous in terms of both energy savings and equipment costs.

In other words, in order to have a conventional walking beam splitting furnace have a catch-up function equivalent to that of the furnace of the embodiment, the number of divisions of the walking beam must be the same as that of the furnace of the embodiment, and the opening of the oval hearth corresponding to this number of divisions is required. In contrast, in the furnace of the present invention, the number of holes in the oval hearth remains the same as in a conventional simple walking beam furnace, and the beam splitting is possible. Since the increased hearth openings are caused by the vertical movement of the post, they can be made to match the cross-sectional shape of the post, so that the heat energy dissipated through the openings is extremely small.

Furthermore, while conventional walking beam division furnaces require lift devices and traverse devices corresponding to the number of divisions, the furnace of the present invention only requires lift devices corresponding to the number of divisions, and does not require a traverse device, which significantly reduces equipment costs. It's advantageous.

As detailed above, the walking beam furnace of the present invention is extremely useful as a heat retention furnace or heating furnace with a buffer function, which is placed between a continuous casting device and a rolling mill.

[Brief explanation of drawings]

The drawings show an embodiment of the walking beam furnace of the present invention, and FIG. 1 is a vertical cross-sectional view of the furnace, and FIG.
It is an A sectional view. 1...Walking beam frame, 2...
Mountain hearth shell, 3... Walking post, 4...
... Hearth, 5... Hearth opening, 6...
Walking beam, T... Walking beam lift cylinder, 8... Bent rod, 9... Cam, 10... Lift transmission mechanism, 11...
・・Walking beam traverse cylinder, 12・・
...Divided lift beam, 13... Lift beam frame, 14... Hearth opening, 15...
...Lift beam post, 16...Lift beam cylinder, 17...Charging port, 18...
...Extraction port, 19...Preceding material group, 20...
...Last charging material, 21... Trailing material group, 22
...Top charging material, 23...Empty furnace section.

Claims (1)

[Claims] 1. A walking beam characterized in that the beam arranged between the walking beams is divided into a plurality of parts in the furnace length direction, each of the divided beams can be raised and lowered, and the upper limit of each divided beam is set higher than the upper limit of the walking beam. Furnace.