JPS5848557Y2 - Auxiliary door device for heating furnace charging port - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an auxiliary door device for a heating furnace charging port that works in conjunction with the charging door at the heating furnace charging port to minimize the gap between the end of the steel material and the heating furnace.

Conventionally, in the case of a heating furnace with a single pusher type, the steel materials are pushed and charged by the pusher in a state where they are in contact with each other, so the charging port door cannot be closed. In addition, in the case of a walking beam system, for example, the length of the steel material in the furnace length direction is longer than the charging pitch, as in the case of slabs, or the length of the steel material in the furnace length direction is longer than the charging pitch, as in the case of plumes and billets. Due to the pitch, the steel material stops directly below the door, so the charging port door cannot be closed, and the charging door is often operated with it always open.

To achieve this Δ, operations are generally carried out to minimize the rise of the door and reduce the gap between the upper end surface of the steel material and the lower end surface of the door, but there is nothing to shield the steel material in the lateral direction, and the furnace body There is an opening between the inner walls on both sides, and this has the drawback that cold air can enter from outside the furnace or flames can leak from inside the furnace.

In addition, the length of the steel material in the furnace width direction, that is, the length of the steel material in the lateral direction, is not constant, and in the case of the shortest steel material, the opening between the furnace inner wall on both sides of the furnace body and the steel material has a considerably large area, and the cold air volume or There was a drawback that the amount of flame leakage was large.

The present invention was conceived in view of the above, and by providing auxiliary doors that close the gap between the furnace inner wall and the end surface of the steel material on both sides of the furnace body, the opening between the furnace inner wall and the end surface of the steel material is made small. It is an object of the present invention to provide an auxiliary door device for a heating furnace charging port that eliminates the above-mentioned drawbacks.

The present invention will be explained below with reference to examples.

In FIG. 1, 1 is a furnace body, and 2 is a charging door.

The charging door 2 is provided with a rail 4 fixed with a lip 3 that projects and is fixed to the charging door 2.

The auxiliary door 5 is horizontally movably suspended by a plurality of rollers 7 attached to a support member 6 integrally formed with the auxiliary door 5.

The rollers 7 are equipped with internal bearings and are lubricated with a heat-resistant lubricant to ensure smooth rotation. prevents it from tilting.

One end of a chain 12 is fixed to one end of the auxiliary door 5, and the chain 12 is attached to a bracket 10 fixed to the steel structure of the furnace body 1.
Through the idle sprocket 11 pivotally supported by
It is configured to be hoisted up and down by a sprocket 9 attached to an elevating drive shaft 8 of the charging door 2.

On the other hand, one end of the chain 13 is fixed to the other end of the auxiliary door 5, and a balance weight 17 is fixed to the other end of the chain 13. It is configured to apply a tensile force to draw the auxiliary door 5 toward the steel material 18 via the sprocket 16.

Note that 19 and 20 are a sprocket h and a chain for opening and closing the charging door.

When the charging door 2 is raised, the lifting drive shaft 8 of the charging door 2
The sprocket 9 attached to the chain rotates, and the chain 12 is wound up.

Therefore, the auxiliary door 5 slides along the surface of the charging door 2 and is opened.

At this time, the balance weight 17 is lifted and works to pull the auxiliary door 5 back toward the steel material 18 side, and is in balance with the pulling force exerted on the chain 12.

When the charging door 2 reaches its upper limit and the steel material 18 has been charged,
The charging door 2 is lowered, and as the charging door is lowered, the sprocket 9 rotates in the opposite direction to when the charging door 2 is raised, thereby lowering the chino 12.

By lowering the chain 120, the auxiliary door 5 is slid along the surface of the charging door 2 toward the steel material 18 by the balance weight 17, and is closed.

When the other end surface of the auxiliary door 5 comes into contact with the steel material 18, the steel material 18
The auxiliary door 5 stops sliding in the closing direction due to the reaction force from the auxiliary door 5 .

Even after the auxiliary door 5 stops sliding in the closing direction, the charging door 2 descends to the set lower limit in order to minimize the gap between the upper end surface of the steel material 18 and the lower end surface of the charging door 2. Continue.

At this time, the chain 12 loses its tension and relaxes as shown by the two-dot chain line in FIG. 1, causing it to droop.

Note that a chain guide 21 fixed to the bracket 10 prevents the chain 12 from coming off the sprocket wheel 11.

Therefore, the maximum and minimum values of the horizontal length of the steel material 18,
By determining the length of the chain 12 in consideration of the maximum deviation of the charging position of the steel material 18 from the center of the furnace, the horizontal length of the steel material 18 and the maximum deviation from the center of the furnace can be determined. Regardless of the value, the horizontal gap between the left and right auxiliary doors 5 and the steel plate 18 can be made zero.

Also, depending on the difference between the maximum and minimum horizontal lengths of the steel plate 18, the pinch circle diameter of the sprocket 9 is appropriately selected relative to that of the charging door lifting sprocket 19 on the lifting drive shaft 8. By doing so, it is possible to prevent the gap between the lower end of the charging door 2 and the upper end of the steel material 18 from becoming narrow when the auxiliary door 5 is opened.

In addition, the auxiliary door 5, like the charging door 2, comes into contact with the slightly inclined sliding surface 22 of the furnace body 1 due to its own weight, making the auxiliary door 5 stable during opening and closing, and maintaining a seal with the furnace body 1. make it good

In addition, by locating the chains 12 and 13 on the auxiliary door 5 somewhat above the center of gravity of the auxiliary door 50, the operation of the auxiliary door 5 can be stabilized.

In addition, it is desirable to lubricate and cool the bearings of the sprockets 11 and 16 as described above for the rollers 7, and also to provide a heat insulating cover 23 on the steel material 18 side of the sprocket 16, and further providing a jacket on the heat insulating cover 23. It is even more effective if the inside of the jacket is cooled with water.

As explained above, according to the present invention, the gap between the steel material and the auxiliary door can be reduced to zero, and in combination with the charging door, the opening of the charging port can be minimized.

In addition, the opening and closing movement of the auxiliary door depends on the driving force of the charging door.
No special drive is required for the auxiliary door.

Moreover, this simplifies the entire system, requiring only a slight increase in the driving force of the charging door, and eliminating the need for an operation control device, making maintenance easy and economical.

[Brief explanation of the drawing]

Fig. 1 is an overall front view of one embodiment of the present invention, and Fig. 2 is a front view of an embodiment of the present invention.
3 is a plan view taken along line AA in the figure, and FIG. 3 is a plan view taken along line BB in FIG. 1...Furnace body, 2...Charging door, 5...Auxiliary door, 9,
11° 16 and 19... Sprocket, 12 and 13... Chain, 17... Balance weight.

Claims (1)

[Scope of utility model registration request] a pair of auxiliary doors slidably suspended on the surface of a charging door provided at the steel material entrance of the heating furnace; one end of the auxiliary door is fixed to one end surface of the auxiliary door and is rolled up by raising and lowering the charging door; A first chain is wound down, and a second chain has one end fixed to the other end surface of the auxiliary door and a balance weight fixed to the other end to counter the driving force of the auxiliary door as the loading door rises. An auxiliary door device for a heating furnace charging port, which is equipped with a chain and opens and closes in accordance with the rise and fall of the charging door.