JPH0743455U - Heat treatment equipment - Google Patents

Abstract

(57) [Summary] [Purpose] When the work for reassembling the castable heat insulating material in the hearth has a removable cartridge hearth, take it to another place apart from the annealing base and rework the castable heat insulating material. It is an object of the present invention to provide a heat treatment apparatus capable of performing the above. [Structure] Bottom plate 11 has outer ring 8 and seal plate 9
Further, the pedestal base outer periphery 15 and the like are attached, and the cartridge hearth 17 is detachable together with the castable heat insulating material placed between them. [Effect] According to the present invention, the castable heat insulating material can be re-stamped and dried at another place apart from the annealing base, the operation rate of the annealing base is improved, dust is eliminated, and the yield of heat-treated products is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coil heat treatment apparatus for metal strips, for example, a batch type bell-type heat treatment furnace, and more particularly to a coil heat treatment apparatus for metal strips that can be easily repaired.

[0002]

[Prior art]

 Generally, a conventional metal band coil heat treatment apparatus, for example, a batch type bell-type heat treatment furnace has a furnace bottom portion having a structure shown in FIG. In the figure, reference numeral 12 is a hearth plate, an internal pressure pipe 14 is attached to the central portion, an outer periphery 15 of the pedestal base is attached to the outside, and a seal plate 9 is attached to the outside, and the outermost periphery is attached. Is provided with a sand seal 6, and castable heat insulating material is cast in the portion of the chain line hatch between them. In the figure, reference numeral 2 indicates the inner cylinder of the inner cover and the outer cylinder of the inner cover. At the portion where the outer cylinder of the inner cover 2 bottoms, protective gas circulates at the inner side and the temperature is relatively low, and at the outer side, the burner flame directly hits and becomes high temperature. A seal plate 9 is provided here to ensure the sealing property of the protective gas, but the castable heat insulating material in the vicinity has a large temperature gradient and is easily broken and broken, and the protective gas and the air leak through the break. There is a problem that the annealed coil is oxidized and the castable heat insulating material in the vicinity needs frequent repairs. In the figure, reference numeral 16 is a pedestal, which is a member for supporting the coil of the metal band to be heat-treated.

[0003]

[Problems to be solved by the device]

 As described above, the castable heat insulating material in the vicinity of the seal plate 9 has a large temperature gradient and is easily cracked and damaged, and the castable heat insulating material in the vicinity needs frequent repairs. It is desirable to avoid the contamination of the annealing base due to the dust that is generated, and to avoid the decrease in the operating rate of the annealing base in order to require 4 to 5 days for this work and drying work, An object of the present invention is to provide a heat treatment apparatus that meets this demand.

[0004]

[Means for Solving the Problems]

 The heat treatment apparatus according to the present invention is the bottom of the furnace for coil heat treatment of metal strips, and is a cartridge type detachable unit in which a pedestal pedestal portion for supporting the coil load mounted on the foundation and an inner cover support portion are integrated. It is characterized by having a possible hearth.

[0005]

[Action]

 The heat treatment apparatus of the present invention, when recasting the castable heat insulating material at the bottom of the furnace, lifts the cart ridge hearth by hanging the crane wire on the cartridge hearth hanger, and anneals the coil heat treatment apparatus for metal strips. Take it to another location away from the base to recast and heat the castable insulation. For this reason, the structure is such that the work of recasting and drying the castable heat insulating material can be performed without disturbing the heat treatment work.

[0006]

【Example】

 An embodiment of the present invention will be described. A coil heat treatment apparatus for metal strips is required to uniformly and rapidly heat and rapidly cool the coil to a constant heat treatment temperature. However, when the end face of the coil is heated, heat conduction in the metal strip is good and uniform. Heating is easy, but if the outer circumference of the coil is heated, the heat flow between the metal strips is poor and uniform heating is difficult. Therefore, when heat-treating the coil, the convection plates are sandwiched and the coils are stacked and heated by circulating a hot protective gas with a circulation fan. The present invention provides a cartridge-type detachable hearth which is an integral body of the shaft hole of the circulation fan, the pedestal pedestal that supports the coil load, and the inner cover support.

FIG. 1 is a schematic view showing a vertical cross section of a heat treatment apparatus having a furnace bottom which is a cartridge type removable hearth of the present invention. In the figure, reference numeral 1 is an outer cover, the inner surface of which is constructed of refractory material, a burner 3 is provided in the lower portion, and a combustion exhaust gas hole is provided in the upper portion. A sand seal 6 is provided at the lower end to shut off the combustion chamber from the outside.

While the protective gas circulates in the direction of the arrow inside the inner cover 2, the heat generated by the combustion of the burner 3 is transmitted to the coil of the metal band through the convection plate, and the coil is heated. In the figure, reference numeral 16 is a pedestal, which is composed of strong radial ribs and discharges the protective gas discharged from the circulation fan 4 to the outside of the inner cylinder of the inner cover 2 and supports the coil load. Reference numeral 5 is a motor that drives the circulation fan 4. The central part of the removable cartridge hearth 17 of the present invention is composed of a pedestal base part. The pedestal base part is made of a heat-resistant steel corrugated ring. The pedestal base part inside the pedestal base outer periphery 15 is further provided with a double heat-resistant steel corrugated ring, and the heat resistance and load resistance are high between them. Castable heat insulating material is driven in. Further, an internal pressure pipe 14 is driven into the castable heat insulating material at the center portion, and a very small part of the protective gas discharged from the circulation fan 4 is supplied to the fan shaft hole 13 to positively press the fan shaft hole 13. The surface of the metal strip is prevented from being oxidized by the inclusion of air in the protective gas. On the outside of the pedestal base portion, a lower sealing groove 18 is provided. The seal groove 18 is provided with an outer peripheral ring 8 made of a heat-resistant steel corrugated ring and a seal plate 9, and a gap between them is filled with castable heat insulating material having a high heat insulating property. The lower end of the outer cylinder of the inner cover 2 is brought into contact with this portion to ensure a protective gas seal.

FIG. 2 is a schematic view showing a vertical section of the cartridge hearth 17 of the present invention. FIG. 3 is a schematic view showing a plane of the cartridge hearth 17 of the present invention. The reference numerals in these figures are the same as in FIG. The bottom plate 11 has an outer ring 8 made of a heat-resistant steel corrugated ring, a seal plate 9 also made of a corrugated ring, an outer circumference 15 of the pedestal base, a double corrugated ring inside, and a fan shaft hole 13 in the center. They are firmly attached to each other, and between them, castable heat insulating material with high heat resistance and load resistance is embedded inside, and castable heat insulating material with high heat insulation is embedded outside as described above.

Further, internal pressure pipes 14 are radially attached to the fan shaft hole 13 in the central portion. Further, the cartridge hearth hanger 10 is attached at a symmetrical position on the outer periphery 15 of the pedestal base, and when the castable heat insulating material is re-strike, the cartridge hearth 17 is attached to the cartridge hearth hanger 10 by hanging a crane wire. Therefore, it can be lifted and taken to another place apart from the annealing base of the coil heat treatment equipment for metal strips, and the work of recasting the castable heat insulating material and the work of drying the castable heat insulating material can be performed without disturbing the heat treatment operation. .

FIG. 4 is an enlarged schematic view of the outer peripheral portion of the vertical cross section of the cartridge hearth 17 of the present invention. In the figure, the reference numerals are the same as in FIG.

FIG. 5 is an enlarged schematic view of the outer peripheral portion of the vertical cross section of the heat treatment apparatus of the present invention. In the figure, the reference numerals are the same as in FIG. All of these structures are fixed to the bottom plate 11 to form an integrally rigid cartridge hearth 17. The cartridge hearth 17 can be lifted by a crane by hanging a wire on the cartridge hearth hanger 10. After the cartridge hearth 17 is installed at the center of the hearth plate 12, the ceramic fiber 7 is inserted to ensure heat insulation and sealing.

The above description of the heat treatment apparatus of the present invention has been made mainly on a batch type bell-type heat treatment furnace for a metal band single stack tight coil heat treatment apparatus. The same can be applied to the stationary annealing furnace.

According to the heat treatment apparatus having the cartridge hearth of the present invention, it is possible to carry the cartridge hearth to another place apart from the annealing base and perform the work of recasting the castable heat insulating material and the drying operation. In addition, it is possible to avoid soiling of the annealing base due to dust that accompanies the work of recasting the castable heat insulating material, and to operate the annealing base for 4 to 5 days required for reworking and drying the castable heat insulating material. It is possible to avoid a decrease in the rate.

[0015]

[Effect of device]

 According to the heat treatment apparatus of the present invention, it is possible to avoid soiling of the annealing base due to dust generated during the work of recasting the castable heat insulating material, and it is possible to avoid the inconvenience of air leakage and oxidation of the annealed coil. In addition, the product yield of the coil of the metal strip is improved, and it is possible to avoid a decrease in the operating rate of the annealing base during the 4 to 5 days required for the work of recasting and drying the castable heat insulating material. Production capacity has improved significantly.

[Brief description of drawings]

FIG. 1 is a schematic view showing a vertical section of a heat treatment apparatus of the present invention.

FIG. 2 is a schematic view showing a vertical cross section of the cartridge hearth of the present invention.

FIG. 3 is a schematic view showing a plane of a cartridge hearth of the present invention.

FIG. 4 is an enlarged schematic view of the outer peripheral portion of the cartridge hearth of the present invention.

FIG. 5 is an enlarged schematic view of an outer peripheral portion of the heat treatment apparatus of the present invention.

FIG. 6 is a schematic view showing a vertical section of a conventional heat treatment apparatus.

[Explanation of symbols]

 1 Outer Cover 2 Inner Cover 3 Burner 4 Circulating Fan 5 Motor 6 Sand Seal 7 Ceramic Fiber 8 Outer Ring 9 Seal Plate 10 Cartridge Hearth Lifter 11 Bottom Plate 12 Hearth Plate 13 Fan Shaft Hole 14 Inner Pressure Pipe 15 Pedestal Base Outer 16 Pedestal 17 Cartridge hearth 18 seal groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Hayo Fukai 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Instructor, Tsunemi Miyazaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo No. Japan Steel Pipe Co., Ltd. (72) Creator Yoshito Haraguchi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Taiji Yokoyama 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Inside the Steel Tube Co., Ltd. (72) Hiromi Okamoto 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Steel Tube Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A furnace bottom of a coil heat treatment apparatus for metal strips, comprising a cartridge-type removable hearth, which is a pedestal pedestal for supporting a coil load mounted and installed on a foundation and an inner cover support. A heat treatment apparatus having.