JPH054886Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to an improvement of a device for heating or keeping hot slabs during conveyance, and particularly relates to the improvement of a device for heating or keeping warm slabs when conveying them. This relates to a series of thin, movable heat insulating members.

[Prior art and issues] Currently, in many steel mills, both the steel manufacturing process and the rolling process require conveyance devices (conveyance paths) such as roller conveyors and walking beam conveyors.
A continuous casting and processing method is adopted in which the parts are connected. In the steelmaking process, in order to ensure that the manufactured slabs, blooms, billets, etc. are sent to the rolling process without causing a drop in temperature as much as possible, transport of the slabs, blooms, billets, etc. is carried out to prevent heat radiation and furthermore to prevent danger. In many cases, a heat-retaining device is installed in the road section.

This type of heat retention device is usually tunnel-shaped, with both sides and the top of the conveyance path surrounded by insulation material and steel plates.
Since the entrance/exit portion is open for the passage of the hot slab, heat is dissipated from this portion and the heat retention effect tends to be insufficient. Some attempts have been made to install an iron door (a sliding door or a swing door) lined with heat insulating material over this opening, or to suspend curtains made of heat-resistant cloth such as asbestos, but both methods have their drawbacks. It's not satisfying.

In other words, in the case of an iron door, the width of the opening of the device is 12m.
The length of the steel door is about 0.5 to 1m, and it needs to be thick to have sufficient strength, so it is quite heavy. As a result, the opening resistance of the steel door is high, and in the case of a swing door, unnecessary transportation energy is wasted, and the casting piece is damaged by collision with the steel door. Also, in the case of a sliding door, an opening device is required, which consumes a lot of energy. Furthermore, the steel plate of the steel door is distorted by high heat, and the insulation material peels off and breaks, and heat dissipates through the gaps.
In particular, in the case of a walking beam conveyor, the slab moves up and down as well as horizontally, which often pushes up the iron door and causes damage. Furthermore, even in the case of a narrow slab, the iron door opens uniformly, which causes various problems such as heat escaping through the gap.

On the other hand, in the case of curtains made of heat-resistant cloth, there are no problems with damage to the slab or opening resistance, but the curtain itself is severely damaged and cannot be put to practical use. This is because flexible fibrous materials with high heat resistance (e.g., heat resistance of 700°C or higher) have poor mechanical strength such as bending resistance and abrasion resistance, and are prone to getting caught in the corners and burrs of slabs. In addition, since it is in constant contact with hot slabs of high temperature (700 to 1000 degrees Celsius), it is subject to severe wear, and it ceases to function as a heat insulating material in a relatively short period of time.

Next, in the rolling process, the hot slab is passed through a reheating furnace to raise it to the temperature required for rolling (approximately 800°C), but this reheating furnace is also installed in a tunnel shape in the conveyance path like the heat retention device described above. Since high-temperature air flows out from the opening, sealing the entrance and exit portion becomes a more important issue than the heat retention device from the viewpoint of energy saving and safety. The same thing can be said for forging furnaces and annealing furnaces, but the asbestos cloth curtains that were conventionally used at the entrance of these furnaces last only about a week and must be replaced frequently, making it difficult to maintain good heat retention. The development of a heat shield device was awaited.

[Means for Solving the Problems] Therefore, the inventor of the present invention has developed an opening section that opens the entrance and exit portions of these heating devices and insulation devices only when necessary, and that does not interfere with the transfer of hot slabs and does not cause any damage. As a result of various research into sealing means, the present invention was completed. And this idea is
The most distinctive feature is that a narrow insulation member, which is a combination of a rotatable coiled wire mesh protection material and a flexible insulation layer, is installed in the width direction at these entrances and exits.

[Example] Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 shows an example of a heat insulating member 1 according to the present invention. It is a narrow piece in which coiled wire mesh protective material 3 is integrally connected. This heat insulating member 1 is then installed in a reheating furnace 8 as shown in FIGS. 2 and 3.
(The same applies to other furnaces and heat retention devices) The protective material 3 is installed in a row in the width direction so as to cover the entire opening with the protective material 3 facing outward. Also exit 10
The parts are similarly arranged in a row with the protective material 3 facing inside. In the figure, reference numeral 11 is a hot slab, 12 is a roller conveyor constituting a conveyance path, and 13 is a heat source such as a gas burner.

This protective material 3 is made of a heat-resistant metal wire such as stainless steel, iron chromium, Inconel, etc. as shown in FIG.
This is a coil wire mesh in which adjacent coils 31, 31 are connected by a heat-resistant metal wire core 32 so as to be rotatable with each other. The protective material 3 and the heat insulating layer 2 may be connected at spots using bolts and nuts, or as shown in the figure, a metal rod or a thin metal plate (flat bar) 4 may be tightened from both sides with bolts 5. Let's do it. In this case, it is preferable to provide a certain degree of freedom so that deformation due to local thermal expansion can be absorbed.

Therefore, this heat insulating member 1 is easily bent and deformed as shown by the chain line in FIG. 1 by external force, and returns to its original state under its own weight when the external force is removed.

For this purpose, when the hot slab 11 is transported and applied to the inlet 9 and outlet 10 of the reheating furnace 8, the heat insulating member 1 is pushed by the hot slab 11 and opens (the state shown by the chain line in FIG. 3). Immediately after the hot slab 11 passes through, it returns to its original position and seals the inlet 9 and outlet 10. Moreover, since the heat insulating member is narrow, this opening is only opened in the area through which the hot slab 11 passes, as shown in Figure 2, so air inflow and outflow is almost completely blocked, making the heat insulation and heat shielding extremely effective. It is done.

The width of this heat insulating member 1 depends on the width of the opening of the device and the width of the hot slab 11, but if it is too wide, the gap will be large when it is opened, and if it is narrow, it will easily move and the overall slit-like gap will increase. , 5-100cm especially 10
~30cm is preferable. Note that if the heat insulating member 1 is lightweight and easily sways, a weight 7 may be provided at the bottom of the heat insulating member 1 as shown in FIG. In the figure, the protective material 3 is attached to the entire surface of one side of the heat insulating layer 2, but if an object never comes into contact with the upper part of the heat insulating layer 1, the protective material 3 may not be provided on that part. good. This provides better flexibility in the upper part.

Further, this heat insulating member 1 has an upper part that is connected to a reheating furnace 8.
In addition to clamping with screws or fasteners, a hanging fitting 6 (FIG. 1) may be provided on the upper edge of the opening for hanging. The array may be arranged in a straight line without any gaps as shown in FIG. 4a, or may be arranged in a plovers pattern (see FIG. 4b) with some parts overlapped. Incidentally, a cover 14 made of flexible heat-resistant cloth may be separately placed over the upper edge of the entrance to prevent heat from leaking from this portion.

On the other hand, regarding the heat insulating layer 2, although it depends on the material and form of the heat insulating material, generally the thicker the heat insulating layer 2, the better the heat insulating effect is. However, if it is too thick, it will lose its flexibility, making it difficult to bend, and increasing the cost. On the other hand, if it is too thin, the insulation effect will be low. Also, with only pine such as ceramic blankets and silica pine,
Poor mechanical properties such as strength.

Therefore, the heat insulating material that makes up the heat insulating layer 2 depends on the temperature of the hot slab, the type of equipment (thick for a reheating furnace or forging furnace, and thin for a heat retention device, etc.), and the location where the heat insulating member 1 is installed, such as the outlet and inlet of the equipment. It is necessary to select the types and combinations appropriately.

For example, the heat insulating member 1 shown in FIG. The heat insulating layer 2 is made by combining silica cloth or ceramic cloth 21, which has excellent properties, and galac cloth 22, which has excellent tensile strength, bending resistance, and wear resistance, on the other side, and sewing the whole body into one piece. be. In some cases, this order may be reversed, or one of the heat insulating materials 21 and 22 may be used as a core material and both surfaces may be covered with another heat insulating material. Next, the heat insulating member 1 of FIG.
The protective material 3 is used facing the high temperature side such as the outlet side of the protective material 3, and one or two layers of silica cloth or ceramic cloth 21 with excellent heat resistance are applied to the protective material 3 side, followed by a mat (needle mat) made of silica fiber. 2
3. A glass cloth 22 is provided at the outermost part. In addition, Fig. 5c shows a high heat shielding device in which the protective material 3 for the entrance of the reheating furnace 8 is used toward the low-temperature side, with a glass cloth 22 on the protective material 3 side, then a silica fiber mat 23, and a silica fiber mat 23 on the outermost side. The heat insulating layer 2 is made by combining silica cloth and ceramic cloth 21. However, it is not limited to the structure of the above embodiment.

Further, the heat insulating member 1 shown in FIG. 5d has a protective material 3 covering the lower end of the heat insulating layer 2 in order to prevent abrasion of the lower part of the heat insulating layer 2. Furthermore, if both sides of the heat insulating layer 2 are covered with protective materials 3, 3 as shown in FIG. In this case, it is particularly preferable to connect the heat insulating layer 2 and the protective members 3, 3 with a certain degree of freedom, or to omit the upper protective member 3 to the extent that it does not interfere.

[Effect of the device] In the device of the present invention configured as described above, the heat insulating layer 2 of the heat insulating member 1 blocks the movement of air inside and outside of devices such as heat retention devices and various types of furnaces, thereby providing heat shielding and insulation. At the same time, a protective material 3 is interposed between the hot slab 11 and the heat insulating layer 2 to prevent direct contact between the hot object and the heat insulating layer 2. Therefore, protrusions such as burrs on the cut end of the hot slab 11 and the hot slab 11
There is no damage or wear due to corners, etc., and the reinforcing effect of the protective material made of coiled wire mesh makes it extremely durable and can withstand long-term continuous operation. Moreover, since many thin pieces are used, even if they are damaged, only the damaged one needs to be replaced, making repairs easy and low cost. Further, the coiled wire mesh does not cause distortion even due to thermal expansion caused by localized and rapid temperature rise, and has the effect that it does not interfere with the movement of slabs in and out.

Next, since the heat insulating member 1 is flexible and can be bent freely, it will not damage the object being conveyed not only on a roller conveyor but also when the object is conveyed on a walking beam conveyor, and will not cause opening resistance. There aren't many. Furthermore, since the heat insulating member is narrow, it is opened only at necessary locations, and there is less heat dissipation through the gaps, which is extremely excellent from the viewpoint of energy saving and safety.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of the heat insulating member according to the present invention, Fig. 2 is a perspective view of a reheating furnace in which the heat insulating member is disposed at the entrance and exit, Fig. 3 is a longitudinal cross-sectional view, and Fig. 4 is the opening. FIG. 3 is a cross-sectional view showing how the heat insulating members attached to the parts are arranged in a row, where a shows a linear shape and b shows a zigzag shape. In FIG. 5, a to e show longitudinal cross-sectional views of different heat insulating members. 1... Heat insulation member, 2... Heat insulation layer, 3... Protective material, 4... Thin metal plate, 5... Bolt/nut,
6... Hanging fittings, 7... Weight, 8... Reheating furnace, 9
...Inlet, 10...Outlet, 11...Hot slab, 12
... Roller conveyor, 13 ... Heat source, 14 ...
Cover made of heat-resistant cloth.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. At the entrance/exit of the device, a thin insulation member consisting of a heat insulating layer made of inorganic fiber insulation material and a rotatable coiled wire mesh protective material attached to the entrance/exit of the device in the width direction while covering the entrance/exit A device for heating or keeping warm a slab, characterized in that the device is connected to a. 2. The device for heating or keeping heat of a cast slab according to claim 1, wherein the protective material is provided on both sides of the heat insulating layer.