JP2607076B2 - Steel heating equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for heating a steel material such as a forging material.

[Prior art] Japanese Patent Application Laid-Open No. Sho 57-79 discloses an apparatus for heating a forging material.
There is an indirect heating type furnace disclosed in Japanese Patent No. 171538. This will be described with reference to FIGS. 3 and 4. A refractory disk-shaped lid member c is provided on one wall of a furnace body b provided with a burner a, and the lid member c is provided with a rotating disk d on its outer surface. Are rotatably supported by the trochanters f, f on the base e, and are rotatable with the drive shaft g. A large number of heat-resistant hollow pipes h, h... The forged material i is fixed on the concentric circle, and the forged material i is put in the hollow pipes h, h.
The forged material heated to a required temperature while rotating is rotated so that it can be extracted outside the furnace through an extraction pipe j provided on the rear wall of the furnace body at an angle.

[Problems of the prior art] However, in the conventional steel material heating apparatus shown in FIGS. 3 and 4, one end of each hollow pipe h, h,... Opens into the furnace and the other end opens outside the furnace. .. Act like a chimney, and the combustion exhaust gas from the burner a escapes out of the furnace through the hollow pipes h, h.
As a result, the heat loss increases, and at the same time, the combustion exhaust gas directly touches the forging material i in the hollow pipe, so that the generation of oxide scale cannot be suppressed. When the oxide scale is generated in this manner, various problems occur, such as the necessity of a scale-down operation and an increase in material loss.

[Means for Solving the Problems] A steel material heating apparatus according to the present invention is intended to solve the above problems, and a steel material heating device having a large number of steel materials charged inside a cylindrical furnace wall made of a heat insulating material. A heat-resistant hollow pipe is fixedly arranged side by side on a concentric circle, and the furnace wall is supported so as to rotate on the base, and a fixed furnace end wall for closing both ends of the furnace wall is mounted on the base. A burner for blowing a flame into the furnace wall body, and a burner for blowing a flame into the furnace wall body and the furnace; A flue for discharging combustion exhaust gas in the wall is fixed to the fixed furnace end wall.

[Operation] Since both open ends of the hollow pipe are closed so that the combustion exhaust gas in the furnace does not easily enter except when the steel material is charged or extracted, generation of oxide scale can be prevented and heat loss is small. In addition, since the burner and the flue are fixed to the fixed furnace end wall that closes both ends of the furnace wall, the burner and the flue can be fixed regardless of the rotation of the furnace wall, and the configuration becomes easy.
The required rotating part does not become large. Therefore, the load on the power unit for supporting and rotating the cylindrical furnace wall is reduced.

[Embodiment] Next, an embodiment of the present invention will be described with reference to FIG. 1 and FIG.

A cylindrical furnace wall 1 made of a heat insulating material is integrally formed with inward flanges 2 and 2 at both open edges, and a large number of heat-resistant hollows are inserted through the flanges 2 and 2 at both ends. Pipes 3 are fixedly arranged at regular intervals on the circumference of the center of the circle. Reference numeral 4 denotes a base, on which four rollers 5 are rotatably supported, respectively, on which the furnace wall 1 is rotatably supported. 6
Is a worm connected to a motor (not shown). The worm meshes with rack teeth 7 fixed on the outer peripheral surface of the furnace wall 1, and the furnace wall 1 is rotated by rotating the worm. It is configured to rotate on the roller 5. Reference numerals 8 and 9 denote fixed furnace end walls fixed on the base 4 to close both ends of the furnace wall body 1. The outer peripheral edges of the fixed furnace end walls 8, 9 are provided on the outer peripheral surface of the furnace wall body 1. Are formed so as to cover a part thereof. Reference numerals 12 and 13 denote flange members provided on the outer periphery of the furnace wall 1 so as to face the front ends of the extended wall portions 10 and 11, respectively. A burner 14 for blowing out a flame into the furnace wall 1 is provided at the center of one fixed furnace end wall 8, and a flue 15 is connected to the center of the other fixed furnace end wall 9. Reference numeral 16 denotes a recuperator provided in the flue 15 for preheating the combustion air of the burner 14. 17 is a charging opening formed in a part of the fixed furnace end wall 9, 18 is a charging table arranged outside the charging inlet,
19 is a charging pusher. 20 is the fixed furnace end wall 8
An extraction port 21 is provided at a part of the extraction port 21 and is an extraction shot provided outside the extraction port.

In the steel material heating apparatus thus configured, the steel material is inserted into the hollow pipe 3 by pushing the steel material on the charging table 18 into the charging inlet 17 with the pusher 19. In this case, when a steel material is stumbled in the hollow pipe, the heated steel material is extracted such that the heated steel material overflows from the extraction port 20 opened at the symmetric position. As described above, since the furnace wall 1 is rotated by the drive of the worm 6, the hollow pipes 3 and
3... The steel material charged therein is uniformly heated by the flame of the burner 14. Moreover, since the openings at both ends of the hollow pipes 3, 3 are opposed to the inner surfaces of the fixed furnace end walls 8, 9 so that the combustion exhaust gas in the furnace cannot enter, the steel material is oxidized by indirect heating. It can be heated to a required temperature without generation of heat.

[Effects of the Invention] As described above, the steel material heating apparatus of the present invention can efficiently and uniformly heat steel materials one after another without being brought into contact with the combustion exhaust gas, and there is no unnecessary outflow of the combustion exhaust gas and little heat loss. Energy savings,
Prevents the generation of oxide scale on steel and improves productivity and work efficiency. Further, since the burner and the flue are fixed to the fixed furnace end wall, there is an advantage that the weight of the furnace wall body is reduced and the load of a power device such as a motor for rotating the furnace wall can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a steel material heating apparatus showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a longitudinal sectional view of a conventional steel material heating apparatus, and FIG. 4 is a front view thereof. 1 ... furnace wall, 3 ... hollow pipe, 4 ... base, 5 ...
Roller, 6… worm, 7… rack teeth, 8, 9… fixed furnace end wall, 14… burner, 15… flue, 17… loading port,
20 ... Extraction opening.

Continuation of the front page (72) Inventor Isao Hiramatsu 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (56) Reference Reference JP, U)

Claims (1)

(57) [Claims] 1. A number of heat-resistant hollow pipes into which a steel material is inserted are fixedly arranged on a concentric circumference inside a cylindrical furnace wall made of a heat insulating material, and the furnace wall is placed on a base. A fixed furnace end wall that closes both ends of the furnace wall is fixed on the base, and the hollow pipe is opened at the fixed furnace end wall by the rotation of the furnace wall. A charging inlet and an extraction outlet whose ends coincide with each other are opened, and a burner for blowing out a flame into the furnace wall and a flue for discharging combustion exhaust gas in the furnace wall are fixed to the fixed furnace end wall. Characterized steel heating equipment.