JPS6218253B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a rotary table-shaped hearth and a hearth cover that covers the hearth, and the forging materials placed radially on the hearth are rotated integrally with the hearth. This relates to a rotary furnace that heats and discharges the heated material in appropriate numbers out of the furnace, and is characterized by heating the forging material uniformly around the circumference and preventing scale from forming on the surface of the material. It is something to do.

In a conventional rotary furnace, a large number of metal rods (forging materials) are arranged on the top of a circular hearth made of fireproof cement or firebricks, and the combustion flame of petroleum is directed directly onto each of the materials. I try to heat it by applying it to it. For this reason, while the upper surface of each material is easily heated, the lower surface in contact with the hearth is less likely to be heated, which tends to cause uneven heating. In addition, an oxide film (scale) is likely to form on the surface of each material due to heating, and the peeled off scale is welded to the upper surface of the hearth, making it difficult for the material to slide smoothly on the hearth when feeding and removing the material. There were drawbacks such as:

In view of the above points, the present invention forms an annular combustion flame circulation groove on the upper surface of the circular hearth, and also provides a large number of refractory tubes in an erected manner between opposite sides of the groove, and in each of these tubes is made of a forging material. By supplying and heating the materials within the tube, it is possible to uniformly heat the materials without generating scale on the surface of each material.

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

As shown in FIG. 1, the plane of the furnace is approximately circular, and as shown in FIG. At the same time, a skirt 4 formed around the periphery of the hearth lid 3 is submerged in a gutter-shaped water reservoir 5 provided around the hearth for liquid sealing. The furnace lid 3
has a plurality of arms 6 radially protruding from its circumferential surface,
The hearth 2 is supported on pillars 7 through 6...
is rotatably supported on a machine base 9 via a thrust bearing 8, and is made to rotate intermittently in small increments by inputs transmitted to a gear 10.

Further, the hearth 2 has a continuous annular groove 11 formed on the upper surface around the material extraction hole 1, and an inverted groove 12 is formed on the lower surface of the hearth lid 3 along the groove.
A large number of refractory tubes 13, 13, . . . made of ceramic, refractory cement, etc. are constructed and arranged radially between opposite banks of the lower groove 11. Further, a burner mounting tube 14 and a smoke exhaust tube 15 are provided from the upper surface of the furnace lid 3 toward the annular groove 11 of the hearth, while a window hole 16 is opened in a part of the skirt 4 on the side surface of the furnace lid 3, A gutter-like material guide 17 and a material supply rod 18 are provided outside the window hole.

The illustrated embodiment is configured as described above,
The action will be explained below.

The mixed gas injected from the oil burner (not shown) attached to the burner mounting tube 14 in FIG. 1 flows along the annular groove 11 of the hearth 2, so when the gas is ignited, the combustion flame is The combustion gas circulates along the groove 11 and is discharged from the smoke stack 15. The annular groove 11 therefore functions as a circulation path for the combustion flame. and combustion flame circulation groove 11
The forging material in each of the refractory tubes 13, 13, . . . installed in the refractory tube is heated through the refractory tube.

On the other hand, below the hearth 3 fixedly supported by a plurality of columns 7, 7..., the hearth 2 rotates intermittently one pitch at a time in the direction of the arrow (clockwise), and each refractory tube 13, 13... It is temporarily stopped at a position facing the material guide 17. While the hearth is temporarily stopped as described above, the material supply rod 18 pushes the forging material A, which has been previously supplied onto the material guide 17, into the refractory tube 13. Fireproof tube 1
The material already present in the furnace 3 (already heated) is pushed out toward the center of the hearth by the new material and is discharged from the material removal hole 1 to the outside of the furnace.

In particular, as shown in FIG. 3, the heat of the combustion flame circulating in the groove 11 acts on the refractory tube 13 installed in the annular groove 11 from the surrounding area as shown by the arrow. The material A is heated to incandescence at a high temperature, and the material A is heated by the radiant heat.

As described above, in the rotary furnace of the present invention, an annular groove is formed around the material extraction hole in the hearth, and a large number of refractory tubes are installed radially in a plan view so as to be installed between opposite sides of the groove. The annular groove is used as a circulation path for combustion flame to heat the rod-shaped material placed inside each refractory tube.The material is floating in the middle, and the combustion flame is distributed around the material through the refractory tube. Because the heat acts evenly, there is no uneven heating of the material, but because the material is surrounded by a refractory tube and is cut off from contact with air or mixed gas during the heating process, it prevents the formation of scale on its surface. The sliding motion for supplying and discharging the same material in the refractory tube is smooth, and the hearth rotates so that the combustion flame receives an even effect over the entire furnace, eliminating local fatigue inherent in rotary furnaces. It has the effect of uniformly heating the above-mentioned material and preventing scale formation while taking advantage of the characteristic of not having any scallops.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line - - of the previous figure;
FIG. 3 is a partially enlarged view of FIG. 2. 1...Material extraction hole. 2... Hearth. 3... Hearth lid. 11...
Annular groove for combustion flame circulation. 13...Fireproof tube. 1
4...Burner mounting tube. 15...Smoke stack. 16... Window hole.
17...Material guide. 18...Material supply rod. A...
Material for forging.

Claims (1)

[Claims] 1. A furnace consisting of a furnace lid placed in the upper part, and a hearth at the bottom of the furnace lid, which is circular in plan, forms a material extraction hole downward from the center of the upper surface, and rotates independently of the furnace lid. In the structure, an annular groove for circulation of combustion flame is formed on the upper surface of the hearth and around the material extraction hole, and a large number of refractory tubes are installed radially in a plan view so as to be installed between opposite banks of the groove, A rotary furnace characterized in that the rod-shaped forging material placed in each of the refractory tubes is heated through the refractory tubes by using the annular groove as a circulation path for combustion flame.