JPS6138910Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a continuous heat treatment apparatus for heat-treating a metal strip coil while moving it on a rotating hearth or a cart. The present invention relates to an apparatus for supplying atmospheric gas into a Matsufuru during heat treatment by covering the Matsufuru with a Matsufuru and intermittently moving the rotary hearth or cart.

A conventional device for continuously supplying atmospheric gas into a matsufuru placed on a rotary hearth is disclosed, for example, in Japanese Patent Publication No. 54-39166. As shown in FIG. 1, a hearth ring pipe 2 is provided at the lower part of the rotary hearth 1, and a self-sealing coupling 3 is attached to the hearth ring pipe 2 corresponding to each stack of the rotary hearth 1. There is. Two flexible tubes 5a, 5b connected to the main atmosphere gas supply pipe 4 are connected to the self-seal coupling 3, and the atmosphere gas from the main atmosphere gas supply pipe 4 is transferred from the flexible tubes 5a, 5b to the hearth ring pipe 2. → Solenoid valve 6 → Supplied into Matsuful 7. Therefore, when the rotary hearth 1 rotates one pitch, the flexible tubes 5a and 5b are continuously changed to the positions shown by broken lines to supply atmospheric gas.

However, this method has drawbacks as described below. First, it is necessary to install the self-seal couplings 3 in a number corresponding to all the stacks, which increases the equipment cost. Second, the atmospheric gas that is passed through Matsuful generally contains dangerous components such as H ₂ and CO, and leakage of atmospheric gas may cause an explosion and is extremely dangerous to the human body. One point and the large number of self-sealing couplings 3 require frequent maintenance. Thirdly, since switching is performed every pitch rotation, switching is required frequently, which shortens the life of the self-sealing coupling, and inevitably leaks a small amount of atmospheric gas each time the coupling is switched. If required, it is necessary to purge the area each time the switching is performed, which has the drawback of increasing the amount of ineffective atmospheric gas used. Fourth, flexible tube 5
This has the drawback that the flexible tubes 5a and 5b are subjected to repeated bending deformation every time they rotate, thereby significantly shortening the life of the flexible tubes 5a and 5b.

In order to improve this drawback, one of the inventors of the present invention previously proposed in Japanese Patent Application Laid-Open No. 119311/1983 a system in which a rotary atmosphere supply pipe is placed at the center of rotation of the furnace.
Although this method is an excellent method that eliminates all of the above-mentioned drawbacks, it also has the following drawbacks.

That is, as shown in FIG. 2, the inside of the rotary hearth 1 basically needs to be left blank in order for the gas supply pipe 8 to rotate, and no building pillars or the like can be erected. In addition, by lifting the gas supply pipe 8 once and then lowering it, it is possible to use the inside of the rotary furnace 9 as a storage place for various parts, but since the gas supply pipe turns above it, it is not possible to use the inside of the rotary furnace 9 for storage purposes. is also limited. In particular, the inability to erect building pillars is not a big problem if the rotary furnace 9 is small, but if the rotary furnace 9 is several tens of meters in diameter, the building span becomes enormous, which greatly increases building construction costs and increases the cost of building the existing building. This could lead to situations where construction cannot be completed.

The present invention proposes a new method that eliminates the drawbacks of these two conventional methods. In other words, the gist of this invention is to take advantage of the fact that rotating hearths or carts normally rotate intermittently, and there is a considerable amount of time between rotational operation and the next rotational movement. By providing an atmosphere supply device and using it in combination, it is possible to supply the atmosphere gas and secure an effective space inside the furnace.

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

FIG. 3 shows a rotary hearth type furnace to which the present invention is applied, and the furnace is composed of a heating zone 10, a cooling body 11, and a material loading area 12. The heating zone 10 may be further divided into a preheating zone, a first heating zone, a second heating zone, a soaking zone, etc. depending on its use, and the cooling zone 11 is divided into several zones depending on the required cooling rate. , it is also possible to adopt various known schemes, but this is not a primary requirement of the present invention.

Reference numeral 13 denotes a ring header for atmospheric gas which rotates together with the rotary hearth 1, and is attached to the rotary hearth 1 by a fixture 14. Reference numeral 15 denotes a rotary atmosphere gas supply device installed inside the furnace, and its details are shown in FIG.
around the stator 17 provided with the stator 17.
The rotor 19 is rotatably provided with a gas passage 18 communicating with the gas supply hole 16 of the rotor 19. A pipe 20 is connected to the rotary atmospheric gas supply device 15, and its tip is connected to a telescopic pipe 21. 22 is a self-sealing coupling provided on the telescopic pipe 21.

By the way, the rotary atmospheric gas supply device 15 does not rotate once with respect to the rotary furnace 9, but can be rotated at any point on the ring header 13, in this embodiment H
Self-seal coupling 23 installed at point and I point
The angle θ is rotated between -1 and 23-2. and the rotary atmospheric gas supply device 15
When the piping 20 is at the H point, the self-sealing coupling 22 of the piping 20 and the self-sealing coupling 23- of the ring header 13 at the H point
1 is connected to supply atmospheric gas. This atmospheric gas is supplied by the rotary atmospheric gas supply device 15.
This continues until rotates to point I.

24 is a fixed atmosphere gas supply device, which includes a telescopic pipe 21 and a self-sealing coupling 2.
2 is provided so that even if the rotary hearth 1 rotates somewhat, it can follow it, and the self-sealing coupling 22 is connected to the self-sealing coupling 23-3 provided on the ring header 13 to prevent the atmosphere. Gas is being supplied. This supply of atmospheric gas is performed while the rotary atmospheric gas supply device 15 rotates from point H to point I as the rotary furnace 9 rotates, and returns to point H in the opposite direction to the rotation of the furnace. It is something.

The furnace body of the rotary furnace 9 is made of furnace grains 25 lined with a refractory material, and the heating zone 10 is equipped with a heating device such as a burner, a radiant tube, an electric heater, etc. 7
heat from the outside. Further, the rotary hearth 1 on which the coil W is placed runs and rotates intermittently on a rail 27 via wheels 26.

Next, the operation of the present invention will be described. First, the rotary atmospheric gas supply device 15 is connected to the ring header 13 at point H.
The self-sealing coupling 23-1 is connected to the self-sealing coupling 23-1. As the rotary hearth 1 rotates, this pipe 20 reaches point I. When this point is reached, the rotating atmosphere supply device 24, which is provided elsewhere at point J, is connected to the self-sealing coupling ring 23-3 provided in the ring header 13, from which the atmosphere is supplied. During this period, while the rotation of the furnace is stopped, the self-seal coupling 23-2 at point I is attached and detached, and the rotary atmospheric gas supply device 15 is returned to point H by appropriate means and connected to the ring header 13 again. When this connection is completed, the fixed atmosphere supply device 24 is detached from the ring header 13. In this way, it becomes possible to continuously supply the atmosphere.

Note that the angle between H and I must be set to an integer fraction of 360°, and the J point is automatically limited to several locations based on this angle. For example, set the angle between H and I to 120° (1/1/360°).
In the case of 3), the number of self-sealing ring couplings that can be attached to the ring header 13 is only 3, which is a fraction of the conventional method.
It can be seen that the reduction is several tenths of that, which significantly simplifies the process, improves maintainability, and reduces gas loss during switching to a negligible level.

In addition, the space between HJI on the opposite side between H and I is free from restrictions associated with the supply of atmospheric gas, and building pillars can be erected freely, which has great industrial value.

In addition, in the above explanation, one is a rotary type and the other is a fixed type, but if the stopping time is very short, it is also possible to have both rotary types and have a difference in their rotation angles. When sending more than one type of gas, the rotating gas supply device does not need to rotate 360°, so it is not necessarily necessary to use a concentric type; instead, it can be used separately and independently to two or more ring headers using a combination of a normal rotating joint and telescopic piping. Of course, a system in which the gas is sent through the air is also possible.
Furthermore, if the rotation speed is very slow and only a small rotation angle is required, the rotary joint may be omitted and a flexible tube may be used instead, but this does not go beyond the scope of the present invention.

[Brief explanation of drawings]

Fig. 1 shows a conventional device, Fig. 2 shows another example of the conventional device, Fig. 3 shows an embodiment of the present invention, and Fig. 4 shows a rotary type in an embodiment of the present invention. FIG. 5 is a side view of the atmospheric gas supply device, which shows a fixed type atmospheric gas supply device in one embodiment of the present invention. 1... Rotating hearth, 7... Matsufuru, 10... Heating zone, 11... Cooling body, 12... Loading place, 1
3...Ring header, 14...Mounting tool, 15...
...Rotary atmospheric gas supply device, 16...Gas supply hole, 17...Stator, 18...Gas passage, 19...
... rotor, 20 ... piping, 21 ... telescopic pipe, 22 ... self-seal coupling,
23... Self-seal coupling ring, 24... Fixed atmosphere gas supply device, 25... Furnace grain, 26...
...wheels, 27...rails.

Claims (1)

[Scope of utility model registration request] In a continuous coil processing apparatus in which a metal strip coil placed on a rotary hearth or a cart is covered with a matzuru and atmospheric gas is supplied into the matzuru for heat treatment, atmospheric gas supply ports are provided at predetermined intervals and the rotary furnace is heated. A ring header for supplying atmospheric gas to each base of the floor or the truck is provided so as to be movable together with the rotary hearth or the truck;
A fixed atmosphere provided with an atmospheric gas supply port that can freely come into contact with and separate from the atmospheric gas supply socket, a rotary atmospheric gas supply device that rotates by a predetermined angle, and an atmospheric gas supply port that can freely come into contact with and separate from the other atmospheric gas supply socket. An atmospheric gas supply device for a coil continuous heat treatment apparatus, characterized in that it is provided with a gas supply device.