JPH0583700U - Air leakage prevention structure of scrap preheating device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is to provide an air leak prevention structure for a scrap preheating device capable of reliably sealing between a hood and a bucket regardless of accumulated scrap powder and the like. To aim. [Structure] The air leak prevention structure of a scrap preheating device according to the present invention covers a hood provided at the tip of an exhaust gas duct on the upper edge of a bucket containing scrap, and draws hot exhaust gas into the bucket to preheat the scrap. In the scrap preheating device configured to do so, the hood is provided with an overhanging portion at the lower end edge over the entire circumference, and a heat-resistant seal cloth is hung from this, and a seal receiving plate that inclines outward and downward is fixed to the bucket upper edge side surface, and the hood is It is characterized in that the seal cloth covers the seal receiving plate when the bucket is covered with the seal cloth.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air leak prevention structure for a scrap preheating device, and more particularly to a structure capable of preventing air leak between a hood and a bucket.

[0002]

[Prior Art]

 Scrap is widely used as a raw material when melting and refining steel in an electric furnace, but such scrap is generally preheated using high-temperature exhaust gas from the electric furnace and then charged into the electric furnace. Target. In this type of scrap preheating device, as shown in FIG. 3, an exhaust gas duct 2 is vertically inserted through a hood moving carriage 1 of an overhead traveling crane type, and an opening lower end of the duct 2 is attached to a central opening of the hood 3. The hood 3, which is inserted through the relative movement, is hung up and down by the lifting chain 4 from the trolley 1. On the other hand, the scrap is stored in the bucket 5 and mounted on the vessel 6 by a crane or the like. After being transported to the lower side of the hood 3 by the scrap truck 7, the hood 3 is lowered to cover the bucket 5, and the hot exhaust gas is drawn from the gas outlet side of the vessel 6 to the bucket 5 through the duct 2 and the bucket 5 I try to heat the scrap inside. Further, the exhaust gas is further sucked from the gas outlet of the vessel 6 to the dust collector, purified, and discharged to the atmosphere.

[0003]

[Problems to be solved by the device]

 However, in the conventional scrap preheating device, when the scrap is charged, scraps or the like may stick out at the top of the bucket 5 and a gap is likely to be formed between the hood 3 and the top of the bucket 5. There is a problem in that the temperature of the preheating gas is lowered by being sucked into the inside of the No. 5, and thus a predetermined preheating efficiency cannot be secured. Further, since the amount of exhaust gas is increased due to the suction of air, there is also a problem that the dust collection efficiency is reduced.

In view of the above problems, the present invention is a scrap preheater that seals a gap between a hood and a bucket to prevent low-temperature air from being sucked into the bucket. It is an object to provide an air leak prevention structure for a device.

[0005]

[Means for Solving the Problems]

 Therefore, in the air leak prevention structure of the scrap preheating device according to the present invention, the hood provided at the tip of the exhaust gas duct is put on the upper edge of the bucket containing the scrap, and the hot exhaust gas is drawn into the bucket to preheat the scrap. In the scrap preheating device described above, the hood is provided with a bulge over the entire circumference, and the heat-resistant seal cloth is hung from the hood, while the upper side of the bucket is fixed with a seal backing plate that inclines downwards. The gist is that the seal cloth covers the seal receiving plate when the bucket is covered with the seal cloth.

[0006]

[Action]

 In the present invention, when the upper edge of the bucket is covered with the hood and the heat-resistant seal cloth comes into contact with the inclined surface of the seal receiving plate, the suction force inside the bucket acts on the seal cloth, and the seal cloth is pulled toward the bucket side. As a result, the hood and the bucket are sealed as a result of being in close contact with the inclined surface of the seal receiving plate, and even if scraps or the like project from the top of the bucket, the sealing performance is not impeded by this.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. 1 and 2 show an air leak prevention structure of a scrap preheating device according to an embodiment of the present invention. In the figure, a pair of hood supports are provided above the floor surface at predetermined intervals and extend in the hood movement direction. The rails R on the hood supports are provided with legs of the hood movement carriage 1. 10 is movably mounted, and the vertical portion of the inverted L-shaped exhaust gas duct 2 is inserted into and fixed to the hood moving carriage 1, and a coupling 20 is attached to the end of the upper horizontal portion thereof. It is designed to be connected to the exhaust gas duct from the furnace.

A hood 3 is suspended below the exhaust gas duct 2 by a lifting chain 4, and a lower end portion of the exhaust gas duct 2 is inserted into a central opening of the hood 3 so as to be relatively movable. A guide roller 30 for guiding relative movement with the exhaust gas duct is attached to the hood 3, and the other end of the elevating chain 4 is taken up by a winder 40 so that the hood 3 is moved up and down by the elevating chain 4. It has become.

On the other hand, on the floor surface, a scrap carriage 7 is movably arranged below the hood support, and a vessel 6 is placed on the scrap carriage 7 and a gas outlet is provided at a lower end portion of a side portion of the vessel 6. 60 is formed and is connected to the exhaust gas duct leading to the dust collector. A substantially cylindrical bucket 5 containing scrap is placed on the vessel 6, an upper surface of the bucket 5 is opened, a water jacket 52 is provided on an outer periphery of an upper end of the bucket 5, and a water jacket 52 is provided. A supporting bracket 53 is provided on the lower side with an appropriate interval. In addition, a hook 50 for hanging by a crane is attached near the upper end of the bucket 5, a loading frame 51 is attached to the body of the bucket 5, and a biplane slide opening / closing bottom lid for discharging scrap is attached to the lower end. 52 is provided.

Further, a substantially doglegged seal receiving plate 80 inclined downward to the outside is fixed to the upper edge side surface of the bucket 5 so as to cover the top end 54. In this example, the top end of the seal receiving plate 80 is fixed. The upper part of 54 is formed in a shape with a raised center. This raised portion is provided so as to prevent dust and the like from accumulating on the top 54, but it is not always necessary. On the other hand, an outwardly projecting portion 81 is formed on the lower end edge of the hood 3 over the entire circumference thereof, and an annular mounting bracket 82 is fixed to the lower surface of the projecting portion 81, and the hood 3 is attached to the mounting bracket 82. 3, the upper end portion of the heat-resistant seal cloth 83 is inserted, clamped by bolts and nuts and hung down, and when the bucket 5 is covered with the hood 3, the seal cloth 83 is placed on the inclined surface of the seal receiving plate 80. It is supposed to be covered. The seal cloth 83 is preferably made of a material having a certain degree of hardness, for example, a heat-resistant non-woven fabric so that the seal cloth 83 is not sucked between the hood 3 and the bucket 5.

In FIG. 2, reference numeral 85 denotes an original seal member, which is a seal ring made of asbestos or the like, but is not necessarily required in the present invention because it can be reliably sealed by the seal cloth 83.

The high-temperature exhaust gas from the electric furnace is sucked into the bucket 5 through the duct 2 and the hood 3, and the scrap in the bucket 5 is preheated. The exhaust gas used for preheating and having a low temperature is sucked into the dust collector through the gap between the bottom lid 51 of the bucket 5 and the gas outlet 60 of the vessel 6, purified, and released to the atmosphere. At that time, in the conventional scrap preheating device, scraps or the like often project between the hood 3 and the bucket 5, the hood 3 is not completely closed, and the surrounding low temperature air is sucked from the gap. As a result, the temperature of the exhaust gas for preheating was lowered and the dust collection efficiency was also lowered. However, in the scrap preheating device of the present embodiment, the seal cloth 83 hanging from the hood 3 causes the seal receiving plate 80 of the bucket 5 to incline. The seal contact plate 80 comes into contact with the surface and is attracted by the exhaust gas to be pulled toward the bucket 5 side to be tightly attached to the inclined surface of the seal receiving plate 80 to prevent air from entering.

[0013]

[Effect of the device]

 As described above, according to the air leak prevention structure of the scrap preheating device according to the present invention, even if the hood is not completely closed due to the obstacle interposed between the hood and the top end of the bucket, the gap is surely secured. It is possible to secure a predetermined preheating efficiency and dust collection efficiency by sealing to. Moreover, the structure is simple, and the manufacturing cost is low.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a leak prevention structure of a scrap preheating device according to an embodiment of the present invention.

FIG. 2 is a main part configuration diagram showing the leak prevention structure.

FIG. 3 is a schematic configuration diagram showing a conventional scrap preheating device.

[Explanation of symbols]

 2 Exhaust gas duct 3 Hood 5 Bucket 80 Seal receiving plate 83 Heat resistant seal cloth

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Kishida Kenji Kishida 3007 Nakajima, Nakajima, Himeji City, Hyogo Prefecture Sanyo Special Steel Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A hood provided at the tip of the exhaust gas duct,
In a scrap preheating device that covers the upper edge of the bucket containing scrap and draws high-temperature exhaust gas into the bucket to preheat the scrap, an overhang is provided around the entire lower edge of the hood. Scrap preheating characterized in that while the cloth is hung down, a seal backing plate that inclines downward to the outside is fixed to the upper edge side of the bucket so that the seal cloth covers the seal backing plate when the hood is put on the bucket. Device air leak prevention structure.