JPH0711166Y2 - Continuous annealing furnace for electromagnetic steel strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to improvement of a continuous annealing furnace for electromagnetic steel strips provided with a floater device.

<Prior Art> A continuous annealing furnace equipped with a floater device has been introduced for electromagnetic steel strips so as not to damage the product, but the floater device is mainly composed of a fan, a duct, and a floater head.

Conventionally, this fan 1 is laterally arranged in the opening of the furnace wall as shown in FIG. 3 (see Japanese Patent Laid-Open No. 58-120730). However, if the fan 1 is installed horizontally in the furnace, the atmosphere in the furnace is high and the weight of the impeller is heavier. Therefore, the shaft receives a downward eccentric load due to the weight of the impeller and causes thermal deformation. Therefore, conventionally, measures have been taken to prevent deterioration of the strength of the shaft due to cooling and prevention of rotation at a low rotational speed during non-operation, but extra maintenance costs such as energy for that have been required. Further, when removing the fan 1 for repairing the fan or the like, the fan 1 is moved laterally to be removed, but a special jig or a hanging wire is required to be reattached, and the work is complicated and it takes a long time to remove.

Further, the duct 2 of the floater device has a duct support member 7
Is supported at a place apart from the hearth 9 with a gap,
It occupies a large space in the furnace, and since radiant tubes are installed above and below the electromagnetic steel strip 10 that is the object to be transported (see Fig. 2), it can be passed through the furnace for inspection and maintenance. The workability in the furnace was poor and the safety was a problem.

In addition, since the floater device, the fan 1, the duct 2 and the floater head 3 are directly exposed to the high temperature atmosphere in the furnace, Cr or
It was necessary to use a large amount of heat-resisting steel containing Ni, which was extremely expensive.

<Problems to be Solved by the Invention> The present invention solves the above problems in a continuous annealing furnace for electromagnetic steel strips equipped with a floater device, reduces thermal deformation of a horizontal fan, and facilitates removal of the fan. An object of the present invention is to provide such a continuous annealing furnace for electromagnetic steel strips, and further, a continuous annealing furnace for electromagnetic steel strips that facilitates the work inside the furnace and reduces the equipment cost.

<Means for Solving the Problems> The inventors of the present invention have conducted earnest studies on prevention of thermal deformation of the horizontal fan of the conventional continuous annealing furnace, and as a result, changed the fan to the vertical direction to solve the first problem. The inventors have come to the present invention based on the knowledge that the above can be solved.

As shown in FIG. 1, an embodiment of the present invention is a continuous annealing furnace for electromagnetic steel strips equipped with a floater device including a fan, a duct, and a floater head, and an opening / closing lid for loading and unloading the fan on the ceiling of the furnace. A continuous annealing furnace for electromagnetic steel strips, in which an opening is installed in a portion of the hearth directly below the opening / closing lid, and a fan is vertically inserted into the opening and fixed to the hearth.

As shown in FIG. 2, an embodiment of the present invention is to construct the duct of the electromagnetic steel strip continuous annealing furnace and the frame of the floater head with refractory materials, and to integrate them with the hearth.

<Operation> By arranging the fan vertically, the load acting on the fan shaft is only the vertical load of the impeller due to its own weight, and the eccentric load is not received. is there. Further, the fan can be easily removed by lifting the opening / closing lid 14 on the furnace ceiling.

In addition, by constructing the fan duct and the floater head base with refractory materials and making them integral with the hearth, it is possible to simplify the furnace internal structure, improve workability, and reduce the amount of heat-resistant steel used. it can.

<Embodiment> An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the continuous annealing furnace of the present invention. FIG. 1 (a) is a longitudinal sectional view of the furnace, and FIG. 1 (b) is a first embodiment.
It is the II sectional view taken on the line of FIG.

In FIG. 1, the fan 1 that was conventionally installed horizontally is installed vertically on the hearth 9. That is, the opening / closing lid 14 for loading / unloading the fan is installed on the ceiling of the continuous annealing furnace.
An opening 11 is provided in the portion of the hearth 9 located immediately below the fan 1, and the fan 1 is vertically inserted into this opening, and a main body supporting portion such as a flange portion of the impeller casing 12 or the bearing casing 13 is placed in the hearth. It is placed and bolted to the fan support 6 fixed to the hearth 9. Along with this, gearbox 5 and motor 4
Will also be installed outside the furnace.

The duct 2 connects the fan 1 and the floater head 3 and guides the gas discharged from the fan to the floater head 3. The duct 2 is placed on the hearth 9 via a supporting member 7 of the duct fixed to the hearth.

By installing the fan vertically in this way, the load acting on the fan shaft is only the load in the vertical direction of the impeller due to its own weight, and the eccentric load is not received, so measures to secure the strength of the fan and the supporting method are simple. is there.

Further, the fan can be easily removed by opening and closing the opening / closing lid 14 on the furnace ceiling.

Next, FIG. 2 shows a second embodiment of the continuous annealing furnace of the present invention, FIG. 2 (a) is a longitudinal sectional view of the furnace, and FIG. 2 (b).
FIG. 2 is a sectional view taken along line II-II in FIG. The embodiment of FIG. 2 is a further improvement of the duct of the floater device and the mount of the floater head, and the installation of the fan is the same as that of the embodiment of FIG.

In FIG. 2, 15 is the side wall of the furnace, and 16 is the ceiling of the furnace.
Reference numeral 17 denotes a radiant tube for heating the electromagnetic steel strip 10 which is arranged at an appropriate pitch above and below the pass line of the electromagnetic steel strip 10 of the transported object.

The floater heads 3 are arranged in the furnace length direction at a predetermined interval determined by the required floating ability, and 18 is a duct connecting the fan 1 and the floater head 3.

In this embodiment, the duct 18 is constructed integrally with the hearth 9 by using a refractory material, and is provided with strength so that an operator can walk on the ceiling 19 of the duct 18 like the hearth 9.

If required for strength, stays (not shown) may be provided on the ceiling 19 of the duct and the hearth 9. In the embodiment shown in FIG. 2, the side wall 20 of the duct 18 also serves as the side wall 15 of the furnace, but the side wall of the duct 18 may be provided separately.

Next, 21 is a pedestal for the floater head 3, which is made of a refractory like the duct 18 and is constructed integrally with the hearth.

A refractory material cannot be used for the floater head 3 and its nozzle, so a heat-resistant alloy is used as usual.

From the above, in the embodiment of FIG. 2, since the duct 18 is constructed integrally with the hearth 9 by the refractory to simplify the structure inside the furnace and allow the operator to pass through the ceiling of the duct 18.
The workability in the furnace has been significantly improved, and since the pedestal 21 of the floater head is also constructed of refractory, the equipment cost of the furnace can be significantly reduced.

<Effect of device> As described above, according to the present invention, since the fan is oriented vertically, the downward weight of the impeller causes less eccentric load to cause thermal deformation, and the fan removal is conventional. It was easier than that.

Furthermore, the duct and floater head pedestal were constructed integrally with the hearth using a refractory to simplify the structure inside the furnace and allow workers to pass through the ceiling of the duct. Moreover, since the amount of heat-resistant steel used has been greatly reduced, the facility cost of the furnace can be significantly reduced.

[Brief description of drawings]

FIG. 1 shows an embodiment of the continuous annealing furnace of the present invention. FIG. 1 (a) is a longitudinal sectional view of the furnace, and FIG. 1 (b) is a sectional view taken along line I-I of FIG. 1 (a). It is a figure. FIG. 2 shows a second embodiment of the continuous annealing furnace of the present invention, FIG. 2 (a) is a longitudinal sectional view of the furnace, and FIG. 2 (b) is II-II of FIG. 2 (a). It is a line sectional view. Fig. 3 shows a conventional continuous annealing furnace, Fig. 3 (a) is a longitudinal sectional view of the furnace, and Fig. 3 (b) is a sectional view taken along the line III-III in Fig. 3 (a). DESCRIPTION OF SYMBOLS 1 ... Fan, 2 ... Duct, 3 ... Floater head, 4 ... Motor, 5 ... Speed increaser, 6 ... Fan support, 7 ... Duct support member, 8 ... Floater head mount, 9 ... Hearth, 10 ...
Transported object (electromagnetic steel strip), 11 ... Opening part, 12 ... Impeller caging, 13 ... Shaft and caging, 14 ... Open / close lid, 15 ... Side wall of furnace, 16 ... Ceiling of furnace, 17 ... Radiant tube, 18 ... Duct , 19 ... Duct ceiling, 20 ... Duct side wall, 21 ... Floater head mount.

Claims (2)

[Scope of utility model registration request] 1. A continuous annealing furnace for electromagnetic steel strips equipped with a floater device comprising a fan, a duct and a floater head, wherein an opening / closing lid for carrying out the fan is installed on the ceiling of the furnace, and a hearth directly below the opening / closing lid. The continuous annealing furnace for electromagnetic steel strips is characterized in that an opening is installed in the area, a fan is inserted vertically into this opening, and it is fixed to the hearth. 2. The continuous annealing furnace for an electromagnetic steel strip according to claim 1, wherein the duct and the cradle for the floater head are made of refractory and are integrated with the hearth.