JPS6346133B2 - - Google Patents

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 coils has a square tray b placed on a charging table a and a connecting tool c, as shown in Fig. 3. Place the object to be heated d on the tray b, open the entrance door e, charge the objects to be heated d, d, and d into the furnace f, and after a predetermined time, exit the furnace. Door g was opened to extract onto extraction table h, and the processed materials d', d', and d' were transported to the next process by a hoist crane. Therefore, trays b', b', and b' remaining on extraction table h must be sent to charging table a as shown by arrow i, which not only requires a conveyor but also requires exclusive use within the factory. This increases the area, which increases the equipment cost, and also has the drawback of requiring the troublesome work of disconnecting the trays b', b', and b' and then reconnecting them at the charging table a upon return.

The present invention aims to solve the above-mentioned drawbacks and provide a heat treatment furnace and its operating method that do not require the return of trays and can efficiently charge and extract materials to be heated, and are suitable for mass production. The furnace is provided with opening/closing doors on opposing side walls of a furnace body surrounded by a heat insulating wall, and a linear roller conveyor capable of forward and reverse rotation is provided on the hearth to connect both opening/closing doors.
The feature is that a table having a roller conveyor that is connected to both ends of the roller conveyor and can be rotated in the forward and reverse directions is placed on the outside of both opening/closing doors. While this is being done, the next object to be processed 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 to be heated is charged into the furnace. , while the extracted heat target is heat-treating the heat target in the furnace, the extracted heat target is replaced with the heat target to be treated 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 where 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 present invention is characterized in that a heated object to be treated is prepared.

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 and 2L on opposing side walls, respectively, and a roller conveyor 3 made 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 via a transmission chain to a motor 6 outside the furnace which can be rotated in forward and reverse directions, and the roller conveyor 3 can convey the object to be heated both to the opening/closing door 2R side and to the 2L side. Tables 8R and 8L having roller conveyors 7R and 7L are arranged outside the opening and closing doors 2R and 2L, respectively. The roller conveyors 7R, 7L are similarly connected to motors 9R, 9L, which are capable of forward and reverse rotation, via transmission chains, respectively.

However, in this heat treatment equipment, the object to be heated in the furnace 1
While heat treating 0 (requires approximately 6 to 15 hours), the object to be heated next 11 to be treated next is prepared on one table 8R. After the heat treatment is completed, the object 10 to be heated is extracted onto the other table 8L by opening the opening/closing door 2L. At the same time, the opening/closing door 2R is opened and the object to be heated 11 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 through the opening/closing door 2R on the same side as when it was loaded, and at the same time, the next prepared object to be heated is loaded through the opening/closing door 2L. In this way, the material to be heated is always extracted from the opening/closing door on the same side as when it was loaded, eliminating the need for transporting the tray, and also allowing the next material to be processed to be placed on the other table during heat treatment. By preparing a hot object, the object to be heated can be replaced in a short time, so the complicated tray transport work can be eliminated without impairing production efficiency.

In the above embodiments, a roller conveyor having a drive source capable of forward and reverse rotation is provided, but the roller conveyor itself does not necessarily have a drive source, and may be used with a known insertion device for pushing the object to be heated into the furnace. Alternatively, an extraction device for drawing out the object to be heated from inside the furnace may be provided on each of the tables.

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, as well as having high production efficiency and being suitable for mass production, which is advantageous in contributing to reducing heat treatment costs. It is something.

[Brief explanation of the drawing]

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, 7R, 7L...Roller conveyor, 8R, 8L...Table, 10, 11...Heated object.

Claims (1)

[Scope of Claims] 1 Opening/closing doors are provided on opposing side walls of a furnace body surrounded by a heat insulating wall, and a linear roller conveyor capable of forward and reverse rotation is provided on the hearth to connect both opening/closing doors. . A batch-type heat treatment furnace, characterized in that tables each having a roller conveyor that can be rotated in forward and reverse directions and connected to both ends of the roller conveyor are arranged on the outside of both opening/closing doors. 2 Opening/closing doors are provided on the opposing side walls of the furnace body surrounded by a heat insulating wall, and a linear roller conveyor that can be forward/reversed is installed on the hearth to connect the two opening/closing doors. Tables each having a roller conveyor that can be reversibly connected to both ends of the roller conveyor are arranged, and while the object to be heated in the furnace is being heat-treated, the object to be heated next is placed on one table. The prepared and heat-treated objects are extracted onto the other table, and at the same time, the prepared objects are loaded into the furnace. Then, when the heat treatment of the heated object in the furnace is completed, the heated object 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 heated object is removed from the opposite side. By charging the next object to be processed into the furnace through the opening/closing door, and repeating this charging and extraction process, the object to be heated is always extracted from the opening/closing door on the same side as when it was charged. A method for operating a batch-type heat treatment furnace, characterized in that, during heat treatment, an object to be heated next is prepared on the other table.