JPS59123723A - Continuous heat treatment equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an energy-saving continuous heat treatment apparatus that can reduce heat loss and efficiently heat treat objects.

Continuous heat treatment equipment that saves energy by using the heat emitted when cooling objects such as metals to preheat the objects to be newly heat-treated is basically already available. For example, as shown in Fig. 7, in order to recover the heat of the object to be heated after heat treatment, the furnace body is formed into a U-shape in plan, and the object to be heated is conveyed by making a U-turn inside the furnace. It was something to do.

Fig. 1 F Tip To explain in more detail, S is a heated object made of a metal strip wound into a coil.As shown by the arrows inside the furnace body, there is a front chamber 1, a heat exchange chamber 2, an intermediate partition chamber 3, , the heating chamber 4, the direction change section 5, the intermediate partition chamber 6, the heat exchange chamber 7, and the rear chamber 8.

The heat exchange chamber 2 and the heat exchange chamber 7 are communicated with each other by a communication duct 9, and the atmosphere inside the furnace is exchanged with each other by a circulation fan (not shown), so that the atmosphere inside the furnace is exchanged with the heat exchange chamber 7 after passing through the heating chamber 4. Sensible heat possessed by the object to be heated S located therein is used to preheat the object to be heated 8 located in the heat exchange chamber 2.

However, such a heat treatment furnace requires a complicated direction changing device to make a U-turn on the object to be heated S in the direction changing section 5, and furthermore, since the object to be heated is heated to a high temperature in the direction changing section 5, a heat resistant However, this method has the drawback of increasing equipment costs because it also requires consideration of performance.

Furthermore, although it has generally been done to increase the heat insulation properties of continuous heat treatment equipment by increasing the thickness of the furnace walls, the heat loss through the furnace walls still accounts for a very large proportion.

This invention has been made in consideration of the above, and eliminates the need for U-turns in the furnace in this type of energy-saving continuous heat treatment equipment, and also reduces heat loss through the furnace wall as much as possible. The purpose is to achieve energy savings and equipment savings.

Next, an embodiment of the continuous heat treatment apparatus according to the present invention will be described with reference to FIGS. In this continuous heat treatment apparatus, two linear continuous furnaces A and B are constructed in parallel, and the object to be heated S is transported to the continuous furnaces A and B in mutually opposite directions. The heating chambers 4a and 4b of the bicontinuous furnaces A and B are formed adjacent to each other, and intermediate partition chambers 3a, 3b, 6 are formed before and after each heating chamber.
Heat exchange chambers 2a, 2b, 7a, and 7b are formed via a and 6b.

9a is a communication duct that connects the heat exchange chamber 2a and heat exchange chamber 7b that are adjacent to each other, and Qb is a communication duct that connects the heat exchange chamber 2b and heat exchange chamber 7a that are adjacent to each other, as shown in FIG. These communication ducts communicate the molten bodies A and B at the ceiling and the bottom of the floor. Reference numeral 10 denotes a circulation fan installed on the ceiling of the heat exchange chamber 2a and the heat exchange chamber 2b, and the rotation of the fan causes the atmosphere in the furnace of the heat exchange chamber 2a and the atmosphere in the heat exchange chamber 7b to interact with each other, thereby exchanging heat. room 2b
The atmosphere inside the furnace and the atmosphere inside the furnace of the heat exchange chamber 7a interact with each other. Therefore, the heat of the objects S located in the heat exchange chambers 7&, 7b is transferred to the heat exchange chambers 2&, 2 through the furnace atmosphere.
The heat is transmitted to the heated object S located at point b. Also, both jaw heat chamber 4a
As shown in FIG. 4, the furnace wall n on the opposite side of the furnace walls U is shared by the double-jaw heating chambers 4a and 4b, and a window hole ν is formed in a part of the furnace wall U.

Ribs indicate stirring fans installed on the ceilings of the heating chambers 4a and 4b, 14 indicates radiant tubes installed on the ceilings and floors of the heating chambers 4a and 4b, and la and lb are front chambers, 8a and 8b.
is a rear chamber, and each of these chambers and the intermediate partition chambers 3a, 3b
, 6B, 6b are heat exchange chambers 2a, 2b.

They are provided to isolate the atmospheric gas in the heating chambers 7a, 7b and the heating chambers 4m, 4b from the outside air. In addition, in this embodiment, a roller hearth type was explained in which the object to be heated S is supported on the hearth rollers 15 and conveyed in a predetermined direction by the rotation of the hearth rollers. Of course, other conveyance methods may also be used.

Figure 3 shows the temperature in each zone of the object to be heated S passing through the continuous furnaces A and B in this heat treatment apparatus. Since they are transported in opposite directions, the temperature rise lines for A and B are symmetrical.

As explained above with respect to the embodiments, the continuous heat treatment apparatus of the present invention has two continuous furnaces constructed in parallel and conveys the objects to be heated in opposite directions. There is no need to make a U-turn inside the furnace. This simplifies the structure, reduces equipment costs, and eliminates the risk of trouble occurring in the furnace at the direction change section, making operation easier. In addition, since the side walls of the adjacent heating chambers for both jaws are shared, even if the heat from one heating chamber passes through this side wall, it is used without waste to heat the object in the other heating chamber. Therefore, even if the side wall does not have high heat insulation performance, it has various beneficial effects such as being able to save energy.

[Brief explanation of drawings]

FIG. 1 is a horizontal cross-sectional plan view schematically showing a conventional energy-saving continuous heat treatment apparatus, FIG. 2 is a horizontal cross-sectional plan view of a continuous heat treatment apparatus showing an embodiment of the present invention, and FIG.
The cross-sectional view taken along the line X-X in the figure, and the cross-sectional view taken along the YY line in Figure 2.
FIG. 5 is a heat treatment temperature diagram of the object to be heated. S... Heated object, A, B... Continuous furnace 12aI 2
b17a, 7b...heat exchange chamber, 4a, 4b...
Heating chamber, 9&, 9b...Communication duct, 11...
・Side wall. Patent applicant Daido Steel Co., Ltd. No. 3! ! 21 Figure 4

Claims (1)

[Claims] Two linear continuous furnaces are constructed in parallel, and the heating chambers of the two continuous furnaces are formed in adjacent positions, and the objects to be heated are transported in opposite directions to the two continuous furnaces, and heat is heated before and after the two continuous furnaces. Continuous heat treatment characterized by forming exchange chambers respectively, providing communication ducts to exchange the furnace atmospheres of the heat exchange chambers of the bicontinuous furnaces, and further sharing the furnace walls on opposite sides of the bicontinuous heat chambers. Device.