JPH0266112A - Means of transporting short-sized billet in heating furnace - Google Patents

Abstract

PURPOSE:To provide the title transporting means which makes effective use of a general-purpose type heating furnace and can transport short-sized materials by adopting short-sized transporting means and installing a means for separating the transporting means and the short-sized billet placed on the transporting means to the outlet side of the heating furnace. CONSTITUTION:The short-sized billet 3 of, for example, 1M length to hinder transportation is placed on the transporting means 2 of about >=2M length prior to the insertion thereof into the heating furnace and is carried and transported into the furnace in the same manner as for billets of an ordinary length. Only the billet 3 with which heating is completed and which is taken out together with the transporting means 2 to the outside of the furnace is lifted from above the transporting means 2 by a billet pushing-up device 6 provided to a transporting device side in the process of transporting the billet 3 to a hot rolling mill. The plane shape of the transporting means 2 is notched longitudinally in the central part and is formed to a U shape. The sepn. of the billet 3 and the transporting means 2 is enabled while the transporting means 2 is made to remain on the table by the pushing-up operation mentioned above. On the other hand, the removal of the transporting means 2 is executed by rotating rollers 1 of the table in the counter notch direction of the means 2 in the pushed-up state of the billet.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a means for conveying steel billets such as slabs, blooms, and ingots in a heating furnace, and in particular, short steel billets having a length of approximately 1M are suitable for conveyance. The present invention relates to a conveying means within a heating furnace.

[Conventional technology]

Regarding the heating furnace used to heat the material in hot rolling equipment, an overview is discussed in "Recent hot strip manufacturing technology in Japan (2nd edition)" edited by the Iron and Steel Institute of Japan, PL4-19.

These heating furnaces perform continuous heat treatment on materials whose shapes and dimensions are relatively similar, such as continuously cast slab materials and bibloc slab materials.

[Problem to be solved by the invention]

However, in recent years, the demand for high-mix, low-volume materials, mainly special steel, is expected to increase. (up to finish rolling) are being installed.

The shape of the material used for this is 1-. Slab.

Blooms, etc., especially ingot materials, are short in length, which causes various problems when conveying them within a heating furnace.

Normal type heating furnaces with skids installed in the heating furnace are roughly divided into those with walking skids and those with fixed skids and bushing pieces, but the spacing between the skids is arranged extremely close to each other. Due to various problems caused by this (skid strength, poor convection of heating flow, material displacement during ta feeding, etc.), the length of the material inserted into the heating chamber is required to be approximately 2M or more. On the other hand, even in a heating furnace equipped with skid-forming reverse rolls, it is not economical to arrange the rolls closely in order to convey short materials that are rolled relatively infrequently, in addition to the same problems as with the skid type.

An object of the present invention is to provide a means that makes use of the above-mentioned general-purpose heating furnace and also enables transport of short materials.

[Means to solve the problem]

The above object is achieved by employing a short material conveyor and by installing means for separating the conveyor and the short steel pieces loaded on the conveyor on the outlet side of the heating furnace.

[Effect]

That is, before inserting short steel pieces that pose a problem in transportation into a heating furnace, they are loaded onto a carrier having a length of approximately 2M or more, and then inserted and transported into the furnace in the same way as normal length steel pieces. It is something.

After heating is completed, the steel billets taken out of the furnace together with the conveyor are pushed out from the conveyor by a billet pushing device installed on the conveyor (usually a roller table) during the conveyance process leading to the hot rolled material. Make it possible to raise it. For this purpose, the planar shape of the carrier is made into a U-shape with a central portion notched in the longitudinal direction. If the bottom of the steel piece is directly pushed up from this U-shaped notch using the push-up tool on the push-up device side, it becomes possible to separate the steel piece and the carrier while leaving the carrier on the table. The conveyance tool is removed by rotating the rollers on the table in the direction opposite to the notch of the conveyor while the billet is being pushed up.If the billet is returned to the table after removal, it can be used for rolling work similar to long materials. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

In the figure, in a heating furnace using a conveyance method using hearth rolls 1, the conveyor 2 has a length at least twice the roll pitch so that it can be stably conveyed on the table. Prior to insertion into the heating furnace, the short material 3 for rolling is loaded onto a part of the center of the above-mentioned conveying tool 2 and heated together with the conveying tool 2.

For this reason, the material of the conveyor is high Mn steel or Ni-Cr steel.

A material having high temperature strength such as NiCr-Mo steel is suitable. Grooves 4 of various shapes are machined on the loading surface of the conveyor 2 in order to improve the flow of heating current and improve the heating properties of the loaded steel pieces. Further, a U-shaped notch 5 with one side open in the longitudinal direction is provided in a part of the center of the carrier. Its width is short side material 3
It is narrower than the minimum width B of , and is designed to stably support the short side material 3 in the longitudinal direction. Furthermore, the U-shaped notch ensures heating properties. As described above, inside the heating furnace, smooth conveyance can be achieved by loading the short material 3 on the conveyor 2, but outside the heating furnace, due to rolling,
It is necessary to separate the short material 3 from the conveyor 2.

On the third surface, the billet push-up tool 6 is disposed directly below the conveyance table leading to the hot rolling mill, and the push-up operation is performed by an actuator 7 and the correct position is ensured by a guide 8.

The width b' of the push-up tool 6 is 3
The width of the notch is narrow by 0 to 40 rrn, and the push-up tool 6 can move up and down within the notch width.

In the above configuration, separation is carried out by temporarily stopping the conveyor 2 on the push-up tool 6, and then raising the push-up tool 6 to directly push up the short material 3, creating a gap of about 10 mm between the conveyor 2 and the short material 3. This can be achieved by driving the table roller group 9 while ensuring this, and transporting the transport tool 2 to the opening side of the U-shaped notch.

After separation, if the push-up tool 6 is lowered to reload the short material 3 onto the rolling table, it can be transported to the rolling mill by the rolling table having a roller pitch that allows the short material to be transported.

FIG. 5 and FIG. 6 show an example of the arrangement when the present invention is applied to a multi-purpose rolling facility.

Figure 5 shows the heating furnace 17 line and the rolling line table 12.
In this example, the steel billet pushing device 14 is housed in the intermediate table 15, and the carrier tool 2 after separation is pushed out to the carrier tool collection table 18 side by the carrier tool pusher 16 and collected, and the steel billet is supplied. The steel bars from the table 19 are loaded and reused. The steel billets after separation are placed on rolling line table 1
2 and rolled to a rollable thickness in a rolling mill 10,
The sheet is repeatedly rolled while controlling the tension using a furnace coiler 11 to reach the final thickness.

The finished product passes through a rolling line table 12 and is finally wound up by a take-off machine 13 and taken out as a coil.

Figure 6 shows the heating furnace 17 line and the rolling line table 12.
This is an example of a case where the line is different from that of the intermediate table 15, and the transfer to the intermediate table 15 is performed by the transfer 20, and the conveyor 2 after separation is directly returned to the conveyor recovery table 18.
Collection similar to the design.

It is possible to reuse it.

Regarding the shape of the groove provided on the loading surface of the carrier 2, as shown in FIG. 7, an arrangement in which the U-shaped notch 5 side and the outside are in communication has a better heat uniformity effect than the first design. Furthermore, since the conveying tool 2 is subjected to repeated thermal shocks, the cross-sectional shape of the groove needs to be rounded as much as possible at the groove bottom corners to prevent cracks from occurring. The groove depth is preferably 10 mm+ or more to ensure good hot air circulation.

〔Effect of the invention〕

According to the present invention: 1. Even short materials that cannot be transported in a heating furnace can be transported in a heating furnace by being loaded on a transport tool. This makes it possible to increase the size of the heating material without imposing an equipment burden on the heating furnace.

2. The separation of the wi feeding tool and the short material can be carried out by simply pushing up the bottom of the short material directly on the rolling line table after heating, using a U-shaped notch provided in the conveying tool. This can be expected to shorten the separation time and reduce heat loss of the heating material.

3. Recovery of the conveyor after separation can be performed on the table in the rolling line, so no new table equipment is required for recovery. Moreover, if the system is such that the conveyor can circulate between the rolling table and the heating furnace, the heat of the conveyor immediately after recovery can be used, and the efficiency of the heating furnace can be improved.

[Brief explanation of the drawing]

FIG. 1 shows the outer shape of a conveyor according to an embodiment of the present invention,
Fig. 1(a) is a plan view, Fig. 1(b) is a front view, Fig. 1(C) is a side view, Fig. 2 is a diagram of the conveyance state in the hearth roll heating furnace, and Fig. 3 is a diagram. FIG. 4 is a side cross-sectional view of a push-up device showing a method of separating a short steel piece from a conveying tool; FIG. 4 is a view taken along the line II in FIG. 3; FIG. 6 shows an example of the arrangement of rolling equipment when the present invention is applied, and FIG. 7 shows a diagram of the shape of the conveyor loading surface groove. FIG. 7(a) is a plan view, FIG. 7(b) is a side view, and FIG. 7(c) is an enlarged detailed view of the groove. DESCRIPTION OF SYMBOLS 1... Hearth roll, 2... Conveyor, 3... Short steel material for rolling, 4... Groove, S... U-shaped notch, 6...
- Steel billet lifting tool. 7... Actuator 8... Guide, 10...
rolling machine. 12... Rolling line table, 14... Steel billet pushing device. 16...Carrier pusher 17...Heating furnace, 18
...Transportation tool recovery table, 19...Silver supply table, 20...Transfer mechanism Figure 30 Figure 4

Claims (1)

[Scope of Claims] 1. In an equipment for transporting and heating steel billets such as slabs, blooms, ingots, etc. in a heating furnace for heating prior to hot rolling work, the billet length is extremely short in the heating furnace. A heating furnace for short steel billets, characterized in that a carrier having a length of a predetermined length or more is used as a transportation means, and the short steel billets are loaded on the carrier and transported into the furnace together with the carrier. Means of transportation. 2. The planar shape of the carrier is U-shaped with a central portion cut out in the longitudinal direction, and the upper billet loading surface is provided with grooves having an uneven shape as hot air convection channels in the heating furnace. The means for conveying short steel pieces in a heating furnace according to claim 1. 3. After heating is completed, the conveying tool and the steel billet are separated by using the U-shaped notch area of the conveying tool and pushing up the bottom of the steel billet from the table side on the table in the rolling line. 2. The means for conveying short steel pieces in a heating furnace according to claim 1, wherein the conveying means is directly pushed up, and the conveying means is removed from the pushing-up area by driving a table facing in a direction opposite to the notch of the conveying means. 4. Claim 3, further comprising a recovery table for guiding the conveyor after separation and removal to the heating furnace entrance side.
A means for transporting the short steel billet described above in a heating furnace.