JPH06103154B2 - Maintenance equipment for Roller Hearth furnace - Google Patents

Description

TECHNICAL FIELD The present invention relates to a maintenance device for a roller hearth type heating furnace.

For example, a roller hearth type heating furnace is used for heating steel materials. The roller hearth type heating furnace heats a material to be heated while it is being conveyed by a plurality of conveying rollers installed in the furnace, and the heating furnace is equipped with a mechanism for maintaining the conveying rollers in an emergency. It is necessary. This is because, in the event of an emergency such as a stop or water interruption of the transport roller due to a power outage or some mechanical obstacle, the transport roller must be maintained in an abnormal condition, especially at its upper portion, causing bending and cracking unless the transport roller is maintained. .

The present invention relates to a maintenance device that also serves as scale discharge in the roller hearth type heating furnace as described above.

<Conventional technology and its problems> Conventionally, as a maintenance means against abnormal overheating of the transfer rollers in the roller hearth type heating furnace, the furnace pressure adjusting damper is fully opened, while the burner blower blower installed in the heating furnace is used. A large amount of air is sent into the furnace by utilizing it, and further a large amount of water is sent into the carrying roller by using a cooling water pump of the carrying roller. However,
In such conventional means, for example, in the case of a power failure, the combustion air blower and the cooling water pump of the same power supply system also stop,
In addition, when water is cut off or the amount of water drops, a large amount of water cannot be sent to the transport roller, and as a result, abnormal overheating of the transport roller cannot be sufficiently prevented and its maintenance cannot be performed reliably. There is a point. It is conceivable to prepare equipment such as an emergency power source and blower as well as pumps separately, but it goes without saying that this is an economical burden, a burden to maintain and manage the equipment, and also to install the equipment. The burden of securing space is too large.

<Problems to be Solved by the Invention and Means for Solving the Problems> The present invention provides an improved maintenance device that solves the above-mentioned conventional problems.

Therefore, the present invention is, in a roller hearth type heating furnace, provided with an independent scale discharge chute for each of the conveyance rollers below the conveyance roller in the furnace, and the discharge port of each scale discharge chute is liquid-sealed. A discharge valve for discharging the seal liquid or scale is attached to the container for sealing, and by opening the discharge valve, the liquid sealing state of the discharge port due to the seal liquid is released and the inside of the furnace is discharged from the discharge port. The present invention relates to a maintenance device configured to allow air to be naturally sucked in.

The important point in the present invention is that the discharge mechanism of the scale also serves as the maintenance mechanism of the transport roller, and the maintenance device is
The draft force of the heating furnace is used to cool the transfer roller with a large amount of air sucked into the furnace by a natural phenomenon, and therefore, abnormal overheating of the transfer roller in an emergency can be sufficiently prevented to maintain it. It's definitely done.

Hereinafter, the configuration of the present invention will be described in more detail with reference to the drawings.

<Embodiment> FIG. 1 is a sectional view of an essential part in the furnace length direction showing an embodiment of the present invention. A plurality of burners 13 and a plurality of conveying rollers are provided in a roller hearth type heating furnace 10 constructed by refractory heat insulating walls 11 and 12.
Equipped with 21,22, the exhaust passage 1 opened in the heat insulation wall 11
A furnace pressure adjusting damper 15 is attached to 4. On both sides of the transport rollers 21,22, except for the upper portions of the transport rollers 21,22, fireproof heat shield walls 31,32,3 are provided so as to surround them.
3,34 are erected, and the heat shield walls 31,32,33,34 are heat insulation walls 12
The heat shield walls 31, 32, 33 and 34 are covered with ceramic fibers 41, 42, 43 and 44, respectively. The heat insulating wall 12 is formed in a mountain shape in the middle of each of the conveying rollers 21, 22 and further inclined in the furnace width direction, and the heat insulating wall 12 and the heat shield walls 31, 32, 33, 34 are formed in the lower portion thereof. Between the scale outlet 51,
52,53,54 have been opened.

Below each of the transport rollers 21 and 22, that is, on the valley side of the heat insulating wall 12, independent scale discharge chutes 61 and 62 are provided for each of the transport rollers 21 and 22, and a discharge port at the lower end of the scale discharge chutes 61 and 62 is provided. 61a and 62a are positioned in the liquid-sealed containers 71 and 72, respectively, and the discharge ports 61a and 62a are normally liquid-sealed by the seal liquid A filled in the liquid-sealed containers 71 and 72.

Then, the liquid sealing containers 71, 72 are provided with discharge valves 81, 82 for taking out the sealing liquid A filled therein and the scale falling on the sealing liquid A.
Discharge pipes 81a and 82a are extended from 82, and the discharge pipe 81a
The a and 82a are connected to a collective discharge passage 91 that is inclined in the furnace length direction.

<Operation and the like> Next, the operation and the like of the present invention will be described based on an illustrated embodiment.

At regular times, the material to be heated is heated while being conveyed in the furnace by the conveying rollers 21, 22. In this case, the liquid sealing containers 71 and 72 are filled with the seal liquid A, and the discharge port 6 of the scale discharge chute 61 and 62 is discharged.
1a and 62a are liquid-sealed with the seal liquid A. During the heating, the oxide scale generated is the inclined surface of the heat insulating wall 12 (part of the heat insulating wall
From the inclined surface of 31,32,33,34 to the inclined surface of the heat insulating wall 12), the scale drop port 51,52,53,54, and the scale discharge chute 61,
It passes through 62 in sequence and drops into the sealing liquid A filled in the liquid sealing containers 71, 72. If necessary, discharge valves 81,82
Is opened appropriately, and the oxide scale accumulated therein together with the seal liquid A is discharged from the liquid-sealed containers 7 and 72 to the collective discharge passage 91 via the discharge pipes 81a and 82a. At this time, the discharge ports 61a and 62a of the scale discharge chutes 61 and 62 are prevented from being released from the liquid-sealed state by the seal liquid A, and the seal liquid A, which will be insufficient due to discharge, is added to the liquid-sealed containers 71 and 72.

Then, in the case of an emergency as described above, the discharge valves 81 and 82 are fully opened, the seal liquid A and the oxide scale in the liquid sealing containers 71 and 72 are temporarily discharged, and the liquid sealing of the discharge ports 61a and 62a by the seal liquid A is performed. On the other hand, the furnace pressure adjusting damper 15 is fully opened while the state is released. In this way, the roller hearth type heating furnace 10
A large amount of air is naturally sucked from the discharge ports 61a, 62a into the furnace through the scale discharge chutes 61, 62 by the draft force of the, and the transport rollers 21, 22 are sufficiently cooled by the air. Therefore, the conveyance rollers 21 and 22 are prevented from abnormal overheating and are reliably maintained. At this time, the heat shield walls 31, 32, 33, 34 which are erected on both sides of the respective conveyance rollers 21, 22.
Is for guiding the sucked air to the transport rollers 21, 22 while blocking the heat applied to the transport rollers 21, 22, and is coated on the inside of each of the heat shield walls 31, 32, 33, 34. Since the ceramic fibers 41, 42, 43, and 44 that are present have a small thermal inertia, they speed up the cooling of the conveying rollers 21 and 22 by the air that has been sucked in, so that the conveying rollers 21 and 22 can be more effectively maintained.

In particular, when coping with the stoppage of all electric systems in an emergency such as a power failure, the effect of the present invention that the transport rollers are reliably maintained by the above-described natural phenomenon is extremely great. In the same sense, the valve body of the discharge valve is formed of an elastic body (so-called diaphragm valve), the discharge valve is closed when the fluid pressure is applied to the valve body, and the valve body is opened when the fluid pressure is released. It is preferable that the discharge valve is opened by its own elastic restoring force, and the valve operation source of the discharge valve is formed of a shape memory alloy, and the discharge valve is closed when the valve operation source is energized and heated. It is also preferable that the discharge valve is opened by the transformation of the valve operating source itself when the electric heating is stopped. Further, it is also suitable to configure the discharge valve to be fully opened as described above by the detection signal of the furnace pressure, and at the same time, the furnace pressure adjusting damper is automatically fully opened by the restoring force of the spring, for example. The illustrated embodiment is an example in which a liquid-sealed container is provided for each scale discharge chute, but one liquid-sealed container is used as two or more scale discharge chutes depending on the scale generation amount, the scale of the heating furnace, and the like. You may share it. In any case, the invention is not limited to the illustrated embodiment.

<Effects of the Invention> As described above, according to the present invention, it is not necessary to separately prepare an emergency power supply facility and the like. There is an effect that the roller can be surely maintained.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part in the furnace length direction showing an embodiment of the present invention. 10 …… Roller hearth type heating furnace 11,12 …… Adiabatic wall, 13 …… Burner 15 …… Furnace pressure adjustment damper 21,22 …… Conveying roller 31〜34 …… Heat shield wall 41〜44 …… Ceramic fiber 51〜 54 …… Scale drop port 61,62 …… Scale discharge chute 61a, 62a …… Discharge port 71,72 …… Liquid container 81,82 …… Discharge valve A …… Seal liquid

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Tanaka 2-19-16 Kogozo, Yokkaichi-shi, Mie (56) Reference JP-A-61-184384 (JP, A)

Claims (5)

[Claims] 1. In a roller hearth type heating furnace, an independent scale discharge chute is provided for each conveyance roller below the conveyance roller in the furnace, and the discharge port of each scale discharge chute is liquid-sealed. A discharge valve for discharging the sealing liquid or scale is attached to the container for use, and by opening the discharging valve, the liquid sealing state of the discharge port due to the seal liquid is released and the discharge port enters the furnace. A maintenance device that is configured to naturally suck air. 2. The maintenance device according to claim 1, wherein fireproof heat shield walls are provided upright on both sides of the conveying roller. 3. A maintenance device according to claim 2, wherein each inside of the heat shield wall is coated with a ceramic fiber. 4. The maintenance device according to any one of claims 1 to 3, wherein the discharge valve has a valve body formed of an elastic body. 5. The maintenance device according to any one of claims 1 to 3, wherein the discharge valve has a valve actuation source made of a shape memory alloy.