JPS63199818A - Device for heating steel materials - Google Patents

Abstract

PURPOSE:To efficiently and uniformly heat steel materials without forming oxide scale by juxtaposing many pieces of hollow pipes to the concentrical circumference on the inner side of a cylindrical furnace wall body which turns horizontally and charging the steel material therein. CONSTITUTION:This device for heating the steel materials is constituted of the cylindrical furnace wall body 1 which is horizontally rotatably supported by rollers 5 and stationary furnace end wall 8, 9 provided with a burner 14 and a flue 15 connected to a recuperator 16. Many piece of the heat resistance hollow pipes 3, both ends of which are penetrated through collar parts 2, 2 of the aperture edges at both ends of the above-mentioned furnace wall body 1 are arrayed and fixed at fixed intervals on the concentrical circumference. While the furnace wall body 1 is turned by means of a worm 6 and rack gear 7, the steel materials are charged into the hollow pipes 3 through a charging port 17 and an ejection port 20 bored through the end walls 8, 9 by means of a pusher 19 and are taken out by means of an ejection chute 21. Intrusion of a waste combustion gas into the hollows 3 and formation of oxide scale on the steel products are thereby prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus for heating steel materials such as forging materials.

[Conventional technology] A device for heating materials for forging has been developed since 1983.
There is an indirect heating type furnace disclosed in Japanese Patent No. 1.71538. To explain this according to FIGS. 3 and 4, a refractory disc-shaped lid member C is provided on one wall of a furnace body equipped with a burner a, and the lid member C has a rotating disc d on its outer surface. is rotatably supported by trochanters f and f on a base e and rotated by a drive shaft g, and a large number of heat-resistant hollow pipes l+, h... are attached to the lid member C. The hollow pipes h, b...
...Put it inside and heat it while rotating the lid member C.

The forged material heated to the required temperature can be extracted to the outside of the furnace through an extraction pipe j provided in an inclined manner on the rear wall of the furnace body.

[Problems with the conventional technology] However, in the conventional steel material heating apparatus shown in FIGS. 3 and 4, one end of each hollow pipe h, h... is opened into the furnace and the other end is opened outside the furnace. Therefore, the hollow pipe 112
1 B... acts like a chimney, and the combustion exhaust gas from burner A passes through the hollow pipes B, H... and exits out of the furnace, resulting in a large thermal loss. At the same time, the combustion exhaust gas directly touched the forged material i in the hollow pipe, making it impossible to suppress the generation of oxidized scale. When oxide scale is generated in this way, various problems arise, such as the need for scale removal work and increased material loss.

c Means for Solving the Problems] The steel material heating device of the present invention is intended to solve the above problems, and is designed to solve the above-mentioned problems. Heat-resistant hollow pipes are arranged and fixed on concentric circles, and the furnace wall body is rotatably supported. It is characterized by having a charging port and an extraction port that match the open end of the hollow pipe.

[Operation: Both opening ends of the hollow pipe are closed except during extraction when charging steel materials, making it difficult for combustion exhaust gas to enter the furnace. This prevents the formation of oxide scale and reduces heat loss.

[Example] Next, an example of the present invention will be described with reference to FIGS. 1 and 2.

A cylindrical furnace wall body 1 made of a heat insulating material is integrally formed with inward facing flanges 2.2 at the edges of the opening at both ends, and by inserting both ends into the flanges 2.2, a large number of heat-resistant hollows are formed. Pipe 3.3・
... are arranged and fixed at regular intervals on the circumference of the circle. Reference numeral 4 denotes a base, and four rollers 5 are each rotatably supported on the base, and the furnace wall body 1 is rotatably supported on the rollers 5. Reference numeral 6 denotes a worm connected to a motor (not shown), and when the worm is rotated by meshing with rack teeth 7 fixed to the outer peripheral surface of the furnace wall 1, the furnace wall 1 is moved by the rollers. It is configured to rotate on 5. 8.
Reference numeral 9 denotes a fixed hearth wall fixedly installed on the base 4 to close both ends of the furnace wall body 1, and a portion of the outer circumferential surface of the furnace wall body 1 is attached to the outer peripheral edge of each of the fixed hearth end walls 8, 9. Extended wall portions 10.
11 is formed. Note that 12.13 is the extended wall portion 10.
．． This is a flange member provided on the outer periphery of the furnace wall body 1 so as to face the tip of the furnace wall body 1 . A burner 14 is provided at the center of one fixed hearth end wall 8 to blow out flame into the hearth wall body 1.
A flue 15 is connected to the center of the other fixed hearth end wall 9. A recuperator 16 is provided in the middle of the flue 15 to preheat the combustion air of the burner 14.

17 is a charging port opened in a part of the fixed hearth wall 9, 1g
is the charging table located outside the charging port.

19 is a charging pusher. Moreover, 2o is an extraction port opened in a part of the fixed hearth end wall 8, and 21 is an extraction chute provided outside the extraction port.

In the steel material heating device configured in this manner, the steel material on the charging table 18 is pushed into the charging port 17 by the pusher 19, thereby inserting the steel material into the hollow pipe 3. In this case, when the hollow pipe is clogged with steel, the heated steel is extracted by wetting out from the extraction ports 2° opened at symmetrical positions. As described above, since the furnace wall 1 is rotated by the drive of the worm 6, the steel materials charged into the hollow pipes 3, 3, . . . are uniformly heated by the flame of the burner 14. Moreover, that hollow pipe 3
The openings at both ends of ゜3... face the inner surfaces of the fixed furnace end walls 8 and 9 and are configured to prevent combustion exhaust gas from entering the furnace, so that the steel material is free from oxidation scale caused by indirect heating. It can be heated to the required temperature without generating heat.

[9! Effects of Light] As described above in the embodiments, the steel material heating device of the present invention can efficiently and uniformly heat steel materials one after another without contacting with combustion exhaust gas, and there is no unnecessary outflow of combustion exhaust gas and there is little heat loss. It not only saves energy, but also has beneficial effects such as improving productivity by preventing oxide scale from forming on steel materials.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a steel material heating device showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. FIG. 3 is a longitudinal sectional view of a conventional steel material heating device, and FIG. 4 is a front view thereof. l...Furnace wall body, 3...Hollow pipe, 5...
Roller, 6... Worm, 7... Rack tooth, 8
．． 9...Fixed hearth wall, 14...Burner, 15
... Flue, 17 ... Charging port, 20 ... Extraction port. Figure 1 □ A〒- Figure 2

Claims (1)

[Claims] A large number of heat-resistant hollow pipes into which steel materials are charged are arranged and fixed on a concentric circumference inside a cylindrical furnace wall made of a heat insulating material, and the furnace wall is rotatably supported. A steel heating device characterized in that a fixed furnace end wall that closes both ends of the furnace wall is provided with a charging inlet and an extraction port with which the open end of the hollow pipe is brought into contact by rotation of the furnace wall.