JPS5917892Y2 - Continuous heating furnace charging port door - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a daily charger for a continuous heating furnace, and more particularly to a door that can be raised and lowered to be attached to the charging port of a heating furnace in which steel billets are continuously charged by a pusher.

In conventional continuous heating furnaces with a pusher set, a door that is attached to the charging port so that it can be raised and lowered is kept with its lower end abutting against the top surface of the billet. This creates an unclosed portion corresponding to the thickness of the furnace, which causes outside air to enter the furnace or high-temperature air inside the furnace to blow out, causing a worsening of the fuel consumption rate of the furnace.

To prevent this, either insert the tip of the pusher into the furnace, position the rear end of the billet completely inside the door, and then pull the pusher back out of the furnace, or move the billet located directly under the door out of the furnace. One possible method is to lower the pull-back door to the top of the skid, but the former requires an enlarged pusher and auxiliary equipment, and the latter requires a separate installation of a steel billet pull-back device, so both are expensive. That's not practical.

The present invention aims to solve this kind of problem that occurs with the door of a continuous heating furnace with a pusher set.

The purpose of this invention is to completely close the charging port on both sides of the billet at all times and reduce heat loss by simply modifying a portion of the door itself without modifying the furnace structure or pusher. The objective is to obtain a pusher set that can reduce the daily labor charge for continuous heating furnaces.

According to the present invention, the door is attached to the charging port of a continuous heating furnace so as to be able to rise and fall freely, and the door extends parallel to the door at a predetermined distance from the door to the outside of the furnace at a portion adjacent to both ends of the lower side of the door. A horizontal pin of a predetermined length, a disk having a long hole on its diameter for passing through the horizontal pin, and a relatively short and small cylindrical portion attached to the outside of the disk. It is characterized by being equipped with a closing segment that rises and lowers relative to the door itself, which consists of a predetermined number of inner cylinders arranged in parallel in the width direction and the same number of outer cylinders rotatably attached to the outside of each inner cylinder via roller bearings. A door for a continuous heating furnace is obtained.

Now, an embodiment of the apparatus of the present invention will be described below with reference to the accompanying drawings.

Figures 1a and 1b show a conventional door 11 attached to the charging port of a continuous heating furnace with a pusher set, and a steel billet W placed directly below the charging port 3 of the heating furnace 2 is shown.

The door 11 is kept in a position with its lower end abutting the upper surface of the steel strip W, and an unclosed portion 20 is left between the lower edge of the door 11 and the upper surface of the skid 15 on both sides of the steel strip W.

As previously mentioned, the unclosed portion 20 is a source of heat loss to the furnace.

Figures 2.3.4 and 5 show the door 10 of the present invention.

The door 10 of the present invention has a plurality of closing segments 6a, 6b, 6C, which have relatively short widths B in the oven width direction at the lower edge portions at both left and right ends, and are arranged side by side without gaps in the oven width direction.
It is characterized by having...

Since the two sets of closing segments attached to both the left and right ends of the door 10 are arranged symmetrically and have the same structure,
leftmost closed segment) 6a.

Only 6b, 6C, . . . will be explained below.

As shown in FIGS. 2 and 3, a horizontal pin 4 is attached to the outside of the furnace at the left end of the door body 1 adjacent to the lower edge.

The horizontal pins 4 are a pair of cantilever-shaped brackets each having one end fixed to the door body 1 and having a predetermined length extending outside the furnace).
It is supported by 5a and 5b.

The distance between a pair of brackets)-5a and 5b is determined by considering the minimum width steel billet W to be charged into the furnace, and the length L is a closed segment)-6a, 6b, 6C... selected according to the dimensions of the

As shown in FIGS. 4 and 5, the closed segment (6a) includes an inner cylinder 7 mounted on the horizontal pin 4 so as to be movable up and down.

In detail, the inner cylinder 7 has a disk 9 attached to its inner surface.
has a long hole 13 bored in the diametrical direction, and is mounted on the horizontal pin 4 by inserting the horizontal pin 4 into the long hole 13.

The closed segment 6a further includes an outer cylinder 8 rotatably attached to the outside of the inner cylinder 7 via a roller bearing 12.

The inner cylinder 7 and the outer cylinder 8 have the same width B, and a roller bearing 12 arranged between them is held by a retainer 14.

All other closed segments) 6b, 6C... have the same configuration, and a large number of closed segments) 6a, 6b, 6C... have a relatively small width B.
... are arranged side by side in the furnace width direction without any gaps.

Furthermore, the inner cylinder 7. It is desirable to use stainless steel as the material for the outer cylinder 8 and roller bearing 12.

During operation, a predetermined number of closed segments counted from the center line YY of the furnace 2 are pushed up by the steel billet W in contact with the lower surface thereof, depending on the width of the billet W inserted into the charging port 3 by the pusher (see Fig. 3). (See A) The remaining closing segment hangs down by its own weight through the elongated hole 13 to the upper surface of the skid 15 and closes off the unclosed portion 20 in FIG.

Therefore, when the door 10 of the present invention is used, regardless of the width of the steel piece W, the closing segments located on both sides of the steel piece W always hang down due to their own weight and touch the lower edge of the door body 1 and the skid 15.
The gap between the top surface 15 and the top surface 15 is closed.

Therefore, when using the door of the present invention, it is necessary to eliminate the unclosed portions on both sides of the steel material that inevitably occur with the conventional door when charging a steel billet W having a width smaller than the width of the furnace. Heat loss in the furnace can be prevented.

Another advantage of the present invention is that by appropriately selecting the dimensions of the closing segment, such as the diameter of the outer cylinder and the size of the elongated hole in the inner cylinder, the door can be opened automatically by the steel billet W entering the charging port. It is possible.

The structure is simple, there is no need to make major modifications to the door, and it can be produced at a relatively low cost.Since the outer cylinder rotates, contact with the steel billet W is made smoothly, and no eaves are generated on the steel billet W. This is an advantage of the present invention.

[Brief explanation of the drawing]

Figure 1a is a front view of the conventional device, and Figure 1b is the front view of the previous device.
2 is a front view showing the device of the present invention, FIG. 3 is a sectional view taken along line lll-III of FIG. 2, and FIG. 4 is the device of FIG. 2. FIG. 5 is a sectional view taken along line VV in FIG. 4.

Claims (1)

[Scope of utility model registration request] A door that is attached to the charging port of a continuous heating furnace so as to be able to rise and fall freely, the door having a horizontal pin of a predetermined length that extends parallel to the door at a predetermined distance from the door to the outside of the furnace at a portion adjacent to both ends of the lower side of the door. , each comprising a disk having a long hole on its diameter that allows the horizontal pin to pass through, and a relatively short and small cylindrical portion attached to the outside of the disk, and are juxtaposed on the horizontal pin in the width direction of the charging port. A continuous heating furnace comprising a predetermined number of inner cylinders and an equal number of outer cylinders rotatably attached to the outside of each inner cylinder via roller bearings, and a closing segment that moves up and down relative to the door itself. Loading day labor.