JPS58197227A - Heat treatment furnace and operating method thereof - Google Patents

Abstract

PURPOSE:To reduce an installation cost and labor and to improve production efficiency by performing charging of material to be heated and discharging thereof from a charging side alternately from both opening and closing doors of a furnace body by means of forward and backward rotatable roll conveyors provided on a hearth and on the table on the outside of both doors. CONSTITUTION:The material 11 to be heated next is prepared on one table 8R while the material to be heat treated in a furnace is under heat treatment. The material 10 to be heated opens an opening and closing door 2L upon ending of the heat treatment and is discharged onto a roll conveyor 7L possessed by the other table 8L. An opening and closing door 2R is opened at the same instant thereof to charge the material 11 on the conveyor 7R of a table 8R into the furnace. The material discharged on the table 8L is replaced with the material to be heated next during the heat treatment of the material 11. The material 11 which has completed the heat treatment is discharged through the door 2R through which said material is charged onto the conveyor 7R. The above-mentioned operations are repeated thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a batch-type heat treatment furnace and a method of operating the same.

Conventionally, equipment for mass-producing heat treating materials such as steel strips wound into a coil is used to place a square tray b on a charging table a with a connecting tool C. Place the heated objects d on the tray b, open the entrance door e, charge the heated objects d, d, and d into the furnace f, and after a predetermined time, exit door g. Open it and extract it on the extraction table h,
The heated objects d', d', and d' after treatment were transported to the next process using a hoist crane. Therefore, the tray b1 remaining on the extraction table h. b/, b/ must be transported to charging table a as shown by arrow 1, which not only requires a conveyor but also increases the exclusive area within the factory, which increases equipment costs and increases the cost during return. There was a drawback that it required a complicated work of once disconnecting the trays b', b', and b' and then reconnecting them again at the charging table a.

The present invention aims to solve the above-mentioned drawbacks and provide a heat treatment furnace that does not require the return of trays and can efficiently charge and extract materials to be heated, and is suitable for mass production, and a method of operating the same. The furnace is equipped with opening/closing doors on opposite side walls of the furnace body surrounded by a heat insulating wall, and a linear roller conveyor that can be reciprocated in forward and backward directions connects the opening/closing doors to the hearth. It is characterized by having tables each having a roller conveyor that can be rotated forward and backward connected to both ends of the roller conveyor. Prepare the next heat target to be treated on the table of During the heat treatment of the object to be heated in the furnace, the object is replaced with the object to be processed next,
Furthermore, when the heat treatment of the object to be heated in the furnace is completed, the object to be heated is extracted onto the table from the opening/closing door on the same side as the one in which it was loaded, and at the same time, the next object to be processed is extracted from the opening/closing door on the opposite side. By charging the material into the furnace and repeating such charging and extraction, the material to be heated is always extracted from the opening/closing door on the same side as when it was charged, and the next material is transferred to the other table during heat treatment. The method is characterized in that it is strained to prepare the object to be heated.

An embodiment of the present invention will be described below with reference to the drawings.

A furnace body 1 surrounded by a heat insulating wall is provided with opening/closing doors 2R, 2L on opposing side walls, respectively, and a roller conveyor 3 consisting of a large number of rollers connecting the two opening/closing doors is provided on the hearth. 4 is a radiant tube provided in the furnace, and 5 is a circulation fan provided on the ceiling thereof. The roller conveyor 3 is connected to a motor 6 outside the furnace which can be rotated in forward and backward directions via a transmission chain, and the roller conveyor 3 can convey the heated object both to the opening/closing door 2R side and to the 2L side. Tables 8 and 8L each having roller conveyors 7R and 7L are placed outside the opening/closing doors 2 and 2L.Roller conveyors 7R and 7L are also equipped with motors 9R and 9L that can be rotated forward and backward.
They are connected to each other via a transmission and a cheno.

However, in this heat treatment equipment, while the heat treatment object 10 in the furnace is being heat-treated (it takes approximately 6 to 75 hours), the object to be heated next is prepared on one table 8R. After the heat treatment of the object 10 is completed, the opening/closing door 2L is opened and the object 10 is placed on the other table 8L. At the same time, open/close door 2R
At the opening, the object to be heated U on the table 8R is charged into the furnace. During the heat treatment of the object to be heated 11, the object to be heated 10 extracted onto the table 8L is replaced with the object to be heated next.

The heat treated object 11 is extracted onto the table 8R from the opening/closing door N2R on the same side as when it was loaded, and at the same time, the next prepared object to be heated is loaded from the opening/closing door 2L.

In this way, by always extracting the material to be heated from the door on the same side as when it was loaded, there is no need to transfer the material to a tray, and during heat treatment, the material to be processed next is placed on the other table. By preparing hot items, the items to be heated can be replaced in a short time, and the complicated tray transport work can be eliminated without compromising production efficiency.

In the above embodiments, a four-layer conveyor having a drive source capable of forward and reverse rotation has been described, but the roller conveyor itself does not necessarily have a drive source, and a known insertion device for pushing the object into a furnace to be heated, Further, an extraction device for drawing out the heated object from inside the furnace may be provided on each side table.

As explained above, according to the present invention, it is possible to eliminate the tray forwarding conveyor and tray forwarding work that were conventionally necessary, thereby reducing equipment costs and labor, and the present invention has high production efficiency and is suitable for mass production, contributing to a reduction in heat treatment costs. It is beneficial.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a heat treatment furnace according to the present invention, FIG. 2 is a horizontal sectional plan view thereof, and FIG. 3 is a plan view for explaining the operation of a conventional heat treatment furnace. . 1...furnace body, 2R, 2L...opening/closing door, 3...
・Roller conveyor, 7J7L...Roller conveyor. 3R, 3L...Table, 10.11...Heated object. Patent applicant: Daido Steel Co., Ltd.

Claims (1)

[Claims] 1. Opening and closing doors are provided on the opposing side walls of the furnace body surrounded by the heat insulating wall, and a straight line that can be reversibly connected to the hearth is connected to the two opening and closing doors. 1. A batch type heat treatment furnace, characterized in that a roller conveyor is provided, and tables each having a roller conveyor that can be rotated forward and backward connected to both ends of the roller conveyor are arranged outside both opening and closing doors. 2. An opening/closing door is provided on each opposing side wall of the furnace body surrounded by a heat insulating wall, and a linear roller conveyor that can be forward/reversed is provided on the hearth to connect both opening/closing doors. are respectively arranged with tables each having a roller conveyor that can be rotated in the forward and reverse directions and connected to both ends of the roller conveyor,
While the object to be heated in the furnace is being heat-treated, the object to be processed next is prepared on one table, and the object to be heated that has been heat-treated is extracted onto the other table, and at the same time, the prepared object is placed on the other table. The heated material is charged into the furnace, and the extracted heated material is replaced with the next heated material to be treated during the heat treatment of the heated material in the furnace, and then the heat treatment of the heated material in the furnace is completed. At this time, the object to be heated is extracted onto the table from the opening/closing door on the same side as it was charged, and at the same time, the next object to be processed is charged into the furnace through the opening/closing door on the opposite side. By repeating charging and extraction,
A batch type system characterized by always extracting the heated material from the opening/closing door on the same side as when it was loaded, and preparing the next heated material to be processed on the other table during heat treatment. How to operate a heat treatment furnace.