JPH051330A - Coil heat treatment furnace - Google Patents

Abstract

(57) [Abstract] [Purpose] A coil-shaped object to be heat-treated by winding a metal strip or the like is heat-treated by spraying a gas, and the heat of spraying a gas at a constant flow rate regardless of the coil width dimension. Improves transmission efficiency and processing capacity. [Effect] The coil-shaped object to be heated 6 is supported inside the furnace body 1 constructed by the heat insulating wall in such a manner that the central axis 7 thereof is substantially horizontal, and is opposed to both end faces of the coil-like object to be heated 6. A pair of nozzles 14 and 14 are provided so as to move back and forth, respectively, and the nozzles 14 and 14 are adjusted in accordance with the width dimension of the coil-shaped object 6 to be heated.
And the space between the both end surfaces can be adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil heat treatment furnace for heat-treating a coiled object formed by winding a metal member such as a metal strip or wire into a coil by blowing hot or cold air. is there.

[0002]

2. Description of the Related Art In general, heat treatment of a metal member is carried out by putting a substance to be heated in a furnace, stirring the gas in the furnace by a fan, and raising the temperature in the entire furnace by a heater. However, for example, in a heat-treated object in which a metal strip is wound in a coil shape (hereinafter, referred to as a coil-shaped heat-treated object), heat hardly penetrates into the inside by this method, which causes non-uniform heating. For this reason, in the case of such a coil-shaped object to be heat-treated, nozzles are arranged toward both end faces of the object to blow hot air from the nozzles so that the heat can easily penetrate into the inside of the coil.

[0003]

However, since the width of the coil-shaped object to be heated differs depending on the width dimension of the metal strip, the distance between the coil-shaped object to be heated and the nozzle is not constant and narrow. In the case of the coiled heated object, the distance between the nozzle and the nozzle is too wide, and the flow velocity of the hot air blown out from the nozzle drops considerably when it reaches the end surface of the coiled heated object. In the case of the coil-shaped heated object, there was a problem that it was difficult to enter the interior of the furnace because there was no distance from the nozzle, or the end surface of the coil-shaped heated object was too close to the nozzle and resistance to gas blowing was exerted. ..

[0004]

SUMMARY OF THE INVENTION The coil heat treatment furnace of the present invention is intended to solve the above-mentioned problems, and a coil-shaped object to be heated is placed inside a furnace body constructed by heat insulating walls so that its central axis is substantially horizontal. And a pair of nozzles facing the both end surfaces of the coil-shaped heated object are provided so as to move back and forth, respectively, and the nozzle and the both end surfaces are matched with the width dimension of the coil-shaped heated object. The feature is that the interval can be adjusted.

[0005]

By moving the nozzle back and forth according to the width of the coil-shaped object to be heated, the distance between the end surface of the coil-shaped object to be heated and the nozzle can be adjusted as desired, and the gas can be sprayed at a required flow rate at all times. ..

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings.
The furnace body 1 is constructed in a cubic shape by a heat insulating wall, and an opening / closing door 2 for carrying in a heat target is provided at one end thereof. Rails 3 are provided on the floor of the furnace body 1, and the tray 4 is slidably mounted on the rails 3, 3. A pair of support columns 5 and 5 are established on the upper surface of the tray 4, and the center shaft 7 is supported by supporting both ends of the center shaft 7 which is inserted into the coiled object 6 on the support columns 5 and 5. Is supported almost horizontally.

Reference numeral 8 is a circulation fan provided on the ceiling of the furnace body 1, and 9 is a motor provided on the furnace body 1 for rotating the circulation fan 8. Further, 10 and 10 are partition walls provided in the furnace body 1, and the coil-shaped object to be heated 6 is positioned in the processing chamber 11 surrounded by the partition walls 10 and 10. Radiant tube burners 13, 13 are provided in the circulation paths 12, 12 formed between the partition walls 10, 10 and the inner surface of the furnace body 1, and the circulation fan 8 sucks gas in the processing chamber 11, Gas is in circulation 1
Enter 2,2,12 Radiant tube burner 13,13
And is blown out into the processing chamber 11 from the nozzles 14, 14.

The nozzles 14 and 14 are provided with a partition plate 14d in a cylinder 14c integrally formed with flange portions 14a and 14b at both end edges and a blind plate 14e to block the ventilation of the portion, thereby forming a slit-like blow. The outlet 14f is formed in a vertical stripe shape. However, the levers 14 and 14 are connected to the partition wall 1
The sealing material 16, 16 is installed in the round hole opened in 0, 10,
The coil-shaped object to be heated 6 is opposed to both end surfaces by being loosely fitted in the round hole so as to be movable back and forth.

Reference numerals 17 and 17 denote driving devices provided to move the nozzles 14 and 14 forward and backward from the outside of the furnace. The driving devices 17 and 17 have one ends fixed to the back surfaces of the nozzles 14 and 14. A wheel 19 in which the other ends of the screw shafts 18, 18 are projected outside the furnace body 1 and screwed into the screw shafts 18, 18.
And the worm 20 is meshed with the wheel 19. Therefore, by rotating the worm 20 manually or electrically as appropriate, the wheel 19 is rotated and the screw shafts 18, 18 are moved back and forth to move the nozzle 14,
14 moves back and forth together.

In the coil heat treatment furnace configured as described above,
The nozzles 14 and 14 are moved back and forth according to the width dimension of the coil-shaped object 6 to be treated so that the distance between the outlet 14f and the end surface of the coil-shaped object 6 is substantially constant. To do. FIG. 5 shows the relationship between the distance ratio from the outlet and the damping ratio of the velocity at the center of the jet, as shown in the embodiment. The plate jet (h / B ≧ 7, where h / B ≧ 7, but h
Is the distance from the air outlet, B is the air outlet width), and is a circular jet (h / D ≧ 8, where h is the distance from the air outlet and D is the air outlet diameter) that blows out from the round air outlet. About.
In this way, it can be seen that particularly in the case where the width of the air outlet is small, the speed suddenly decreases as the distance from the air outlet increases. Therefore, in the present invention, rather than adjusting the initial blowing speed of the nozzles, the nozzles 14 and 14 are moved forward and backward, and the outlets 14 thereof are moved.
By appropriately adjusting the distance between f and the end face of the coiled heat-treated object 6, the flow velocity of the gas blown to the end face of the coiled heat-treated object 6 can be easily adjusted as desired.

In this embodiment, the nozzle having the slit-shaped outlet has been described, but the shape of the outlet need not necessarily be such a shape. For example, the outlet direction may be the circumference of the coil. You may make it blow out a spiral jet by inclining in a direction. Further, in this embodiment, the case where the coil-shaped object 6 is heated is explained. However, by providing a cooler instead of the radiant tube burners 13, 13, cool air is blown to cool the coil-shaped object 6. In this case, the technical idea of the present invention can be applied as it is.

[0012]

As described above, the coil heat treatment furnace of the present invention is
By moving the nozzle back and forth according to the width of the coil-shaped object to be heated, the distance between the end surface of the coil-shaped object to be heated and the nozzle outlet can be adjusted. Since the gas flows at a high speed on the surface of the object to be heated, there is a beneficial effect that the heat transfer efficiency is improved and the processing capacity is also improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a coil heat treatment furnace of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG.

4 is an enlarged cross-sectional view taken along line ZZ of FIG.

FIG. 5 is a diagram showing attenuation of jet velocity.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 furnace body 6 coil-shaped to-be-heated object 7 central axis 8 circulation fan 10,10 partition wall 11 processing chamber 14,14 nozzle 14f blow-off port 17 drive device

Claims (1)

Claim: What is claimed is: 1. A coil-shaped object to be heated is supported inside a furnace body constructed by heat-insulating walls such that its central axis is substantially horizontal, and both ends of the coil-shaped object to be heated are supported. Coil heat treatment, characterized in that a pair of nozzles facing the surface are provided so as to be able to move back and forth, respectively, and the distance between the nozzle and the both end surfaces can be adjusted according to the width dimension of the coil-shaped object to be heated. Furnace.