JPS5919720Y2 - Extraction port structure of walking beam heating furnace - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an extraction port structure for a walking beam heating furnace.

A walking beam heating furnace is a furnace that heats steel pieces such as slabs to a temperature suitable for processing processes such as rolling. The steel pieces charged through the inlet are heated while being moved one after another, and then extracted through the extraction port.

When heating an extremely short slab in a conventional walking beam heating furnace, the distance between the walking beam and the fixed beam becomes narrow, reducing heating heat transfer.

For this reason, extremely short slabs were heated in a batch furnace.

However, in recent years, the insulation properties of the rails provided on the mounting surface of the support pipe on which the steel slabs are placed have improved, making it possible to process extremely short slabs.

The extraction port structure of a conventional walking beam heating furnace capable of processing extremely short slabs is shown in FIGS. 1 to 3.

The slabs and b' transported by the walking beam a are once placed on the beams c and c', and then extracted out of the furnace by an extractor d that moves in a rectangular manner as indicated by the arrow X.

In the figure, s indicates a long slab and b' indicates a short slab, and two pairs of beams must be provided as shown in the figure so that both slabs b and b' can be placed on the beams, and walking beams a, It must be installed in a position that does not interfere with the extractor d.

Therefore, if it is possible to process from the long slab b to the short slab b', the number of beams in the slab receiver will increase, the shadow effect will increase, heat transfer from the lower part will be blocked, and the slab receiver will have beams c, c.
Since ' is being cooled, there is a risk that the temperature of the slab will drop due to heat conduction from the portions that are in contact with the beams c and c'.

Furthermore, in the short slab b', the steel plate supports were supported by rails e provided for each beam, and the supporting area was narrow, resulting in instability.

In the figure, f is the extraction wall, g is the hearth opening, h is the hearth, i is the burner, j is the fixed beam, and k is the side wall.

The present invention was developed in consideration of such circumstances, and consists of installing multiple water-cooled pipe supports parallel to each other to form a set of support beams, and installing fireproof material to span the set of pipe supports. This is characterized in that the steel piece mounting table on which the steel piece is placed is provided approximately in the range into which the extractor enters from the side wall of the extraction port.

Embodiments of the present invention will be described below based on the drawings.

4 to 7 show an embodiment of the present invention.

In the figure, 1 is a walking beam, 2 is a fixed beam, 3 is an extractor, 4 is a hearth, 5 is a side wall, 6 is an extraction port side wall,
8 is an extraction door, and 9 and 9' are steel pieces.

A steel piece mounting table 27 whose upper surface is on the same level as the steel piece mounting surface of the fixed beam 2 is provided between the fixed beam 2 and the extraction port side wall 6.

The steel piece mounting table 27 has a hollow sub-beam 2 on the upper surface of three pairs of support beams 19, 20, and 21 set up from the hearth 4.
The refractory material 23 is multiplied by 2, and a refractory material 23 is placed on the upper surface of both sub-beams 22.22 so as to extend over the sub-beams 22.22.

A longitudinally extending protrusion 24 is provided at the center of the lower surface of the refractory material 23 so that the protrusion 24 fits between both sub-beams 22 and 22.

In addition, the hollow part of the sub-beam 22 is left as an air layer or filled with a heat insulating material to form a heat insulating layer.
Prevent the low temperature of the support beams 19, 20, 21 from being transmitted to the refractory material 23.

The upper surface of the refractory material 23 has an appropriate shape such as a horizontal surface or an uneven surface so as to be able to withstand the load of the steel piece 9°9'.

A walking beam 1 and an extractor 3 are configured to be able to move in and out between each pair of support beams 19 and 20 and 20 and 21.

In the figure, 25 indicates cooling water circulating within the support beams 19, 20, and 21, and 26 indicates a heat insulating material.

The refractory material 23 is sufficiently heated by the combustion gas filling the furnace, and the support beams 19, 20, 21 are heated by the refractory material 23.
has an insulated structure, so even if the billets 9, 9 are placed on the billet mounting table 27 by the walking beam 1 in order to be extracted outside the furnace by the extractor 3, the billets 9, 9'
temperature never drops.

In addition, since the structure is not such that the steel pieces 9, 9' are supported via rails, the steel pieces 9, 9' are provided to the full thickness of the supporting wall 10, 11, 12.
9', which increases stability, especially in the case of steel billet 9'.

Furthermore, since a sufficiently large space is secured below the steel pieces 9, 9', the circulation of combustion gas is not inhibited and the temperature of the steel pieces 9, 9' is prevented from decreasing.

As described above, according to the present invention, since the supporting structure of the steel billet is made of a refractory material, heat loss can be significantly reduced by cooling water, and energy saving can be achieved.

ii Since the contact surface of the steel billet is made of fireproof material, the temperature will not drop even if the steel billet is placed on it for a long time.

iii Since the area on which the short slab is placed is wide, the steel piece can be placed stably.

Demonstrates excellent effects such as

[Brief explanation of the drawing]

Figures 1 to 3 show the extraction port structure in a conventional walking beam heating furnace, with Figure 1 being an elevational view, Figure 2 being a view taken along the line A-A in Figure 1, and Figure 3 being a view taken along arrow A-A in Figure 1. is the BB arrow view in Figure 1,
4 to 7 show one embodiment of the present invention, FIG. 4 is an elevational view, FIG. 5 is a view taken along the line C-C in FIG. 4, and FIG. A view taken along arrow D, and FIG. 7 is a view taken along arrow E-C in FIG. 4. 1 is a walking beam, 2 is a fixed beam, 3 is an extractor, 6 is an extraction port side wall, 19, 20, 21 is a support beam, 23 is a refractory material, and 27 is a steel piece mounting table.

Claims (1)

[Scope of utility model registration request] A plurality of water-cooled pipe supports are installed parallel to each other to form a set of support beams, and a steel piece mounting stand made of a refractory material is placed so as to span the set of pipe supports, approximately on the side wall of the extraction port. An extraction port structure for a walking beam heating furnace characterized by being provided in an area into which an extractor enters.