JPH01309925A - Method for controlling conveyance of charging table to heating furnace - Google Patents

Abstract

PURPOSE:To efficiently convey a material to be heated without leaving an empty heating furnace by calculating the empty space for each of the plural furnaces, and determining the supplying order of the materials of the size conforming to the empty space. CONSTITUTION:The materials to be heated are conveyed through the charging table, successively charged into the heating furnaces arranged in parallel, heated, held at that temp., and then extracted. In this method for conveying the materials, the cumulative total Ls of the sum of the lengths of the materials from the extracting end to the charging end in the conveying direction of the furnace in the predetermined extracting order of the materials charged in each heating furnace and the sum of the distances between the materials is compared with the length Lr of the furnace to calculate the difference (Lr-Ls). The sum (W+l) of the lengths W of the materials to be charged in each heating furnace in the conveying direction to the furnace and the distance (l) between the materials is calculated. The conveying order of the materials to the furnaces is determined so that (Lr-Ls)>=(W+l) is fulfilled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of controlling transport on a charging table when charging materials to be heated into a plurality of heating furnaces.

[Prior Art] As a conventional method for efficiently charging materials to be heated without creating an empty furnace, for example, Japanese Patent Application Laid-Open No. 12451'''
There is a technique for a slab charging method disclosed in Publication No. 1. When charging slabs, this technology calculates the fuel flow rate required to heat each charged slab to the extraction target temperature using a relational formula that incorporates slab thickness, slab unit weight, charging temperature, and other slab characteristics. In this method, the slabs are rearranged by λ and the slabs are charged in order from small to large and from large to small based on the results of these calculations. Furthermore, when using a plurality of heating furnaces, it is common to charge the heating furnaces while performing this process alternately. In this way, an empty furnace is prevented, overheating of the slab is prevented, sudden fluctuations in fuel flow rate are prevented, and fuel consumption is reduced.

[Problem to be Solved by the Invention 1] By the way, the width of the slab in each of the plurality of heating furnaces is usually different, and the conveyance speed in the furnace changes depending on the width of the extracted slab. If the extraction pitch of each heating furnace is changed midway through, there is a problem that an empty furnace portion is created in the furnace near the charging port.

In addition, the conventional charging method described above can prevent overheating of slabs and rapid fluctuations in fuel flow rate, but this is an effective method when the majority of charged slabs are in the slab yard. . However, in recent years, there has been a trend toward a so-called direct delivery method in which continuous casting equipment is charged into a heating furnace in a short period of time, and when charging into multiple furnaces and the extraction pitch of each heating furnace is different, etc. does not take into account the fact that an empty furnace section occurs in the furnace where the extraction pitch is fast, resulting in fuel loss.

The present invention solves these problems and provides a method for controlling the transfer of a charging table that does not cause an empty furnace section even when heated materials are directly delivered to a plurality of heating furnaces.

[Means for Solving the Problems] The present invention provides a method for transporting heated materials in which the heated materials are sequentially charged into heating furnaces arranged in parallel, and the heated materials are heated and retained. According to the scheduled extraction order of charged materials to be heated, the sum of the lengths of the materials to be heated in the heating furnace conveyance direction from the extraction end to the charging end and the sum of the intervals between the materials to be heated, and 3 is the heating furnace length. Calculate the difference by comparing it with L7, and then calculate the sum β of the length W of the heated material scheduled to be charged in each heating furnace in the heating furnace conveyance direction and the heated material spacing, and each of the above values is (1, ,-1,,)≧W
This is a method of controlling the conveyance of a heating furnace charging table, characterized in that the order of conveyance to the heating furnace is determined in an order that satisfies the relationship +l.

[Function] The present invention efficiently charges the next material to be heated in a plurality of heating furnaces installed in parallel without creating an empty space on the charging side of each heating furnace. Yes, for each heating furnace (calculate the value of t, F-t, sl, that is, the empty space,
By controlling the conveyance of the heated material on the charging table so that the next heated material suitable for this empty space is charged, the occurrence of an empty furnace in the heating furnace is prevented.

[Example] An example of the present invention will be described using two heating furnaces installed in parallel as shown in FIG. In this case, the furnace length is =6
m, and the slab spacing β is 100 mm.

1 is the No. 1 heating furnace, and 2 is the No. 2 heating furnace.
...The symbol ■ indicates the scheduled extraction order. Note that 4 is a charging table for heated materials, and 5 is an extraction table. Further, Table 1 continues to show the width W of the heated material to be charged into each heating furnace, the scheduled charging order, and the scheduled charging order. Here, the length of each heated material 3a, 3b in the heating furnace conveyance direction, that is, the width W of the heated material, is taken as the dimension shown in the figure, and the cumulative total of this W and the heated material spacing 12 is calculated. When compared with the heating furnace length LF, in the No. 1 heating furnace 1,
L, = (1200+1001 + (1200+1
00) + f1200+1001+(1200410
01=5200 L, -L, =6000-5200 =800th
1 Comparing the value of (LF(s) in Table 1 and the width of the heated material [phase] scheduled to be charged to No. 1 heating furnace I next, L, -L, ≧
I'm not satisfied with the relation between W and 10 degrees Celsius.

In addition, in the No. 2 heating furnace 2, L, = (1200+1001 + (1000+1
00+ + +1500+1001+ f1900÷1
001 = 6000tr-tv =6000-600
0 = 0 Next, when comparing this with the width of the heated material ■ scheduled to be charged into the No. 2 heating furnace, the relationship of L, -L, ≧W + flood is not satisfied.

Next, if the heated material ■ is extracted from the No. 1 heating furnace 1,
L, = 3900, and CL,-L,l = 21
It becomes 00. Next, comparing the values of ft, rt, and sl with the width of the heated material [phase] scheduled to be charged into No. 1 heating furnace 1,
LF" satisfies the relationship of L-≧W+l. Therefore, the heated material■
The next thing to be transported is the material to be heated [phase], which is charged into the No. 1 heating furnace 1.

Next, when calculating assuming that the heated material ■ is extracted from the No. 2 heating furnace 2, L, = 4700, (t, , -t,, l
=1300. Comparing the values of (t, , -t, , l) with the width of the heated material ■ to be charged into the No. 2 heating furnace 2, the relationship of L, -L, ≧Wl is still not satisfied. .

Next, when the heated material ■ is extracted from the No. 2 heating furnace 2, for the No. 2 heating furnace 2, l, -1, = 2400, and when this is compared with the width of the heated material ■, L, -1. ,8≧W+l
Therefore, after the heated material [phase], the heated material ■
will be transported.

Next, when the heated material ■ is extracted from the No. 1 heating furnace l, the beam in the No. 1 heating furnace becomes =3900, and (LF-LSl
= 2100. Next, when this value is compared with the width of the heated material 0 scheduled to be charged into the No. 1 heating furnace 1, LF-LS≧w+
The relationship g is satisfied, so after the heated material ■, the heated material 1
3 will be transported.

Similarly, if we calculate the charging order of the heat-receiving materials in accordance with the sequential extraction of the heat-receiving materials, we get (a) (b) (c) (d)
(N) Charging order 21453 Furnace No. 2 No. 1 No. 2 No. 2 No. 1.

In the above embodiment, the case where two heating furnaces are arranged in parallel has been described, but even in the case of three or more heating furnaces, the order of transfer to each ship heating furnace can be sequentially determined by the same procedure.

[Effects of the Invention] As explained above, according to the present invention, the length of the empty space on the charging side of each heating furnace is constantly compared with the width of the material to be heated to be charged, and the empty space is expanded according to extraction. Since the conveyance of the heated materials is controlled on the charging table so that the heated materials are transported in the order that satisfies the relationship that allows them to be charged, even when multiple heating furnaces are used in parallel, the heated materials are The material to be heated can be charged smoothly without being affected by the width of the material to be charged into the extraction pitcher, and there is no charge imbalance between heating furnaces or empty furnaces. It is possible to achieve stable operation of the heating furnace and to reduce fuel consumption.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a heating furnace arrangement for explaining the present invention. 1.2... Heating furnace, 3a, 3b... Heated material, 4...
・Charging table, 5...Extraction table agent Patent attorney Masamitsu Akizawa and 1 other person

Claims (1)

[Claims] In a method of conveying heated materials in which heated materials are sequentially charged into heating furnaces installed in parallel and extracted after raising and retaining the temperature, extraction is performed according to the scheduled extraction order of the heated materials charged to each heating furnace. The cumulative total L_S of the length of the heated materials in the heating furnace conveyance direction from the charging end to the charging end and the sum of the distance between the heated materials is compared with the heating furnace length L_F to calculate the difference, and then the difference is calculated for each heating furnace. Calculate the length W of the heated materials scheduled to be charged in the heating furnace transport direction and the sum l of the distance between the heated materials, and transport them to the heating furnace in the order in which each of the above values satisfies the relationship (L_F-L_S)≧W+l. A method for controlling the conveyance of a heating furnace charging table, characterized in that the order is determined.