JPS6050847B2 - Multi-zone walking beam type continuous heating furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-zone walking beam continuous heating furnace.

Conventionally, in multi-zone walking beam type continuous heating furnaces, materials are charged into the furnace through a specific charging port, heated while being conveyed by the driving of the walking beam, and then extracted from a specific extraction port outside the furnace. The structure of the furnace is designed to accommodate this.

Therefore, in a conventional multi-zone continuous heating furnace, for example, when it becomes necessary to modify the rolling mill installed on the extraction side of the furnace, it is difficult to modify the rolling mill itself while it is in operation. During the modification period, the entire rolling line, including the furnace itself, has to be shut down, which inevitably leads to a drop in productivity.

In order to solve the above-mentioned conventional inconveniences, the present invention...
1 ・- ・ ” 1 ・-- Kameichi 1-1 ',
Inside the furnace
In addition to making the central part a constant combustion zone and the both sides a switching combustion zone, one of the switching combustion zones can function as a heating/soaking zone, so either side can be used for charging and soaking. For example, if a new rolling mill is constructed on the charging table line of the furnace in addition to the operating rolling mill on the extraction table line of the furnace, the construction of this rolling mill The purpose of the present invention is to provide a multi-zone walking beam continuous heating furnace that, after completion, can be replaced with a new rolling mill without requiring a long period of suspension of the rolling line, even with minimal modification of the furnace itself. . Next, the present invention will be explained with reference to the drawings which are one embodiment.

The continuous heating furnace 1 is constructed to be approximately symmetrical in the longitudinal direction of the furnace, with the center of the furnace length as a virtual reference, and the central part is a constant combustion zone 2, and the sides are a first and second switching combustion zone 3, 4. .

The burner 5 in the constant combustion zone 2 is always ON.
, the burners 5 in the first and second switching combustion zones 3 and 4 are as follows:
One of them is operated so that it becomes CN and the other becomes OFF. Furthermore, the movable beam 6 performs rectangular movement by the vertical movement eccentric wheel 7 and the first longitudinal movement cylinder 8, and the fixed beam 1? The material W is transferred alternately to the moving beam 6 and the material W is conveyed from the left to the right in the figure, while
The vertical movement eccentric wheel 7 and the second longitudinal movement cylinder 9 make it possible to transport the material W inside the furnace from the right to the left in the figure.

Further, the doors 1a, 1 of the first and second switching combustion zones 3, 4
Exhaust ports 11a and 11b are provided on the b side, respectively, and the exhaust ports 11a and 11b communicate with each other through an exhaust gas duct (not shown) and are connected to a collective flue G.

However, as described below, either one of the exhaust ports 11a and 11b is closed. In addition, 12a,
12b is a first and second material transport table provided perpendicular to the furnace length direction; 13a and 13b are first and second transfer devices;
14 is a furnace partition wall, and 15a and 15b are scale troughs constituting a known scale discharge mechanism, which discharges scale into a scale packet 16a or 16b by rectangular movement of the moving beam 6.

In order to heat the material W by conveying it from the left to the right in the diagram in the multi-zone walking beam continuous furnace having the above configuration,
Only the exhaust port 11a is opened, the burner 5 of the first switching combustion zone 3 is set to OFF, and the other burners 5 are set to ON.

That is, as shown in the diagram inside the furnace, a part of the constant combustion zone 2 and a part of the first switching combustion zone 3 form a preheating zone A, and the remaining part of the first switching combustion zone 3 forms a charging zone B. On the other hand, constant combustion zone 2
The remainder of the heating zone C and a part of the second switching combustion zone 4 form the second switching combustion zone C.
The remainder of the switching combustion zone 4 forms a soaking zone D. Note that the furnace exhaust gas flows from the soaking zone D to the charging zone B. Furthermore, the moving beam 6 includes a first longitudinally moving cylinder 8 and a vertically moving eccentric wheel 9.
The material W is driven to be transported into the furnace from the left side to the right side in the figure.

Therefore, the material W transferred by the first transfer table 12a is charged into the furnace by the first transfer device (charging machine) 13a, and is transferred into the furnace by driving the moving beam 6. ,
In the meantime, the material W is preheated, heated, and soaked, and transferred to the second transfer table 12b by the second transfer device (extractor) 13b, and then transferred to a rolling mill (not shown).

Now, if it becomes necessary to modify the rolling mill on the second conveying table 12b side, a new rolling mill will be installed on the first table 12a.
Contrary to the above, the burner 5 of the first switching combustion zone 3 is set to 0N, and the burner 5 of the second switching combustion zone 4 is set to 0N.
FF, drive the second longitudinal cylinder 9, and
From the transport table 12b to the second transfer device (charging machine) 13b
The material 7W is charged into the furnace and heated while being transported to the first transport table 12a side.

In addition, in this case, while closing the exhaust port 11a,
The exhaust port 11b is opened. Therefore, contrary to the above case, the charging zone B becomes the O soaking zone, the preheating zone A becomes the heating zone, the heating zone C becomes the preheating zone, and the soaking zone D becomes the charging zone, and the material is It will be heated in the same way.

The furnace partition wall 14 may be arranged as shown in FIGS. 2 and 3 depending on the structure or heating method of the furnace.

In the above embodiment, a furnace was described in which a hydraulic cylinder for longitudinal movement and a scale trough were provided on both sides of the furnace, but it is not necessary to provide these on both from the beginning, and when switching the rolling mill. (When the conveyance direction is reversed), the existing hydraulic cylinder for longitudinal movement and scale trough may be removed and relocated to the opposite side.

As is clear from the above description, the multi-zone walking beam continuous heating furnace according to the present invention is approximately symmetrical in the furnace length direction with the center of the furnace length as a virtual reference;
The central part is a constant combustion zone, and both sides are a switching combustion zone, and by setting one of the burners in the switching combustion zone to 0FF, the charging zone, preheating zone, and heating zone can be accessed from either side of the furnace. and a soaking zone.

Therefore, even if a rolling mill is modified, charging of the furnace can be improved by installing another rolling mill on the previous charging table line and by switching the switching combustion zone and moving beam drive means.・Since the continuous heating furnace can be used with the extraction side reversed, there is no need to stop the entire rolling line, including the continuous heating furnace, for a long period of time, unlike conventional methods, which improves productivity accordingly. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a multi-zone walking beam type continuous heating furnace according to the present invention, and FIGS. 2 and 3 are sectional views of only the furnace body showing other furnace types. 1...Continuous heating furnace, 1a, 1b...Door, 2...Continuous combustion zone, 3...First switching combustion zone, 4...・Second switching combustion zone, 5...
Burner, 6...Moving beam, 10...
・Fixed beam, W... Material, A... Pre-heating zone (heating zone), B... Charging zone (soaking zone), C
... Heating zone (preparation zone), D... Soaking zone (charging zone).

Claims (1)

[Claims] 1. In a multi-zone walking beam continuous heating furnace,
A multi-band walking beam type furnace characterized in that the furnace shape is approximately front-back symmetrical in the furnace length direction with the center of the furnace length as a virtual reference, and that the central part is a constant combustion zone and the sides are a switched combustion zone. Continuous heating furnace.