JPH04270043A - Device for removing torch drop in cast billet for beam blank - Google Patents

Abstract

PURPOSE:To remove torch drop stuck to a cast billet for beam blank having complicate shape with a centrifugal hitting type torch drop removal device. CONSTITUTION:The torch drop on a flat face part is removed with a flat face part hitting hammers 7a, 7b matched with a web face and flange end face in the cast billet 1 at pass line for conveying the cast billet 1. Successively, the torch drop in an inclined part is removed with an inclined part hitting hammer 7c matched with the inclined face at the inner face side of a flange in the cast billet 1. By the combination of the torch drop removal in the flat face part with the torch drop removal in the inclined part, the torch drop removal efficiency is improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing torch sag from beam blank slabs, which is placed in a pass line for conveying beam blank slabs that have been cut to a predetermined length by a torch and have torch sag attached to the bottom thereof. be.

0002

BACKGROUND OF THE INVENTION Slabs produced by continuous casting are reheated in a heating furnace before being rolled in the next step, so they must be cut into predetermined lengths depending on the width of the heating furnace. As for this cutting method, a torch cutting method using gas is generally adopted since mechanical cutting is not possible due to the high temperature of the slab and the large thickness of the cut portion.

[0003] When a slab is cut by the torch cut method, torch sag, which is mainly composed of slag, adheres to the lower part of the cut surface of the slab. This torch sag rarely peels off until the slab is rolled in the subsequent process, and it also affects the dimensions and shape of the product and remains as sagging defects in good quality parts, so it is necessary to remove the torch sag from the slab before the rolling process. There is. Various methods have been proposed for removing torch sag from continuously cast slabs, such as a gas torch method, a knife method, a chain method, a brush method, and a centrifugal impact method. The gas torch method aligns the sag of the slab with the crater and removes the sag using a torch. As for the knife type, for example, JP-A-58-97
Japanese Patent No. 473 discloses a slab torch sagging removal device in which a cutter is fixed to a rotatably attached lever, and the free end of the lever is supported by an inclined cylinder so as to be movable up and down. In addition, Japanese Utility Model Application No. 62-65117 discloses a method for removing torch sag from slabs by following the shape of the slab and scratching and removing sag with a chain with a blade.
Japanese Patent No. 102448 discloses a rotating cylindrical roll. A brush roll comprising a large number of bundled wire rods planted on the cylindrical surface of the roll.
A mechanism is disclosed that includes a mechanism for pressing the brush against the lower surface of a slab that has been gas-fused and is being transported.

As shown in FIG. 5, the centrifugal impact type torch sag removal device 4 includes a rotating rotor 6 that can be raised and lowered in the vertical direction of the pass line, and a plurality of impact hammers 7 that are attached along the circumference of the rotating rotor 6. and a pin 8 that rotatably supports the striking hammer 7. When the rotating rotor 6 is stopped, the impact hammer 7 hangs down via the pin 8, as shown in FIG. 5(b), but the rotating rotor 6
When the hammer 7 is rotated, the impact hammer 7 supported by the pin 8 is rotated in an upright state due to centrifugal force, as shown in FIG. 5(a). Next, the rotating rotor 6 is raised so that the outer periphery of the raised striking hammer 7 is slightly above the lower surface of the slab 1', and the tip of the striking hammer 7 knocks off the torch sag 9 to remove it. It is.

[0005]

[Problems to be Solved by the Invention] Among the conventional techniques, the gas torch type requires high precision in positioning the sagging of the slab and the crater, making the equipment complex and expensive. Furthermore, it is difficult to uniformly remove sag in the slab width direction.
The drawback is that deep digging and sagging of the base material tend to occur.

[0006] The knife type, chain type and centrifugal impact type are mainly used to remove torch sag attached to slabs having a flat shape such as slabs and blooms. However, as shown in FIG. 4, when the beam blank slab 1 consisting of the web 1a and the flange 1b is cut with a torch, there are torch sag on the lower side of the web 1a shown in (A) and on the lower surface of the web 1a (B) as shown in (B). It is attached to the inclined surface on the inner surface of the flange 1b and the end surface of the flange 1b shown in (c).

[0007] For this reason, it is difficult to apply the conventional knife type, chain type, or centrifugal impact type to removing torch sag from a beam blank slab having a complicated shape. Although the brush type can be applied to slabs with uneven cross-sections, it is easily damaged and is not as reliable as the knife type or centrifugal impact type. The present invention has been made in view of the above-mentioned points, and is an improvement on the centrifugal impact type that has been effectively used for slabs and other flat slabs. It is an object of the present invention to provide a torch sag removing device capable of removing torch sag attached to a slab having a beam blank shape.

[0008]

[Means for Solving the Problems] The present invention aims to reduce the torch sag of beam blank slabs, which are cut by a torch and placed on a pass line for conveying beam blank slabs with torch sag attached to the lower part. The removal device includes a centrifugal impact type torch sagging removal device that is equipped with a flat impact hammer that is adjustable in length to match the web surface and flange end surface of the beam blank slab, and can be moved up and down; A centrifugal impact type torch sagging removal device equipped with an inclined part impact hammer adjusted to a length suitable for the inner surface of the flange and capable of moving up and down is arranged in series in series with the pass line for conveying the beam blank slab. This is a device for removing torch sag from beam blank slabs.

[0009]

[Operation] The web surface and flange end face of the beam blank slab are removed by a centrifugal impact type torch sag removal device with a flat impact hammer that conforms to its shape, and the flange inner surface of the beam blank slab is removed to conform to its shape. Torch sag can be efficiently removed on the slab conveyance line by separately removing the torch sag using a centrifugal impact type torch sag removing device having a sloping impact hammer, and by combining these devices.

0010

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. As shown in FIG. 2, when the beam blank slab 1 (hereinafter referred to as slab) cut by the cutting torch 2 is conveyed by the table roller 10, the slab 1 with torch sag is guided by the slab guide 5 and first The torch reaches the centrifugal impact type flat section torch sagging removal device 11 located below the pass line, where it adheres to the flat surface (A) and flange end surface (C) of the web 1a in the beam blank 1 shown in FIG. Torch smear is removed. Next, the beam reaches a centrifugal impact type inclined section torch sag removing device 12, where torch sag adhering to the inclined surface (b) on the inner surface of the flange 1b of the beam blank 1 is removed.

As shown in FIG. 1(a), the centrifugal impact type planar torch sag removal device 11 has a rotating rotor 6 mounted on a bearing 14 fixed to an elevating frame, which rotates via a shaft 15 fixed to the rotor 6. Possibly supported. Six to eight pins 8 are arranged along the circumference of the rotating rotor 6, and each pin 8 has a length adjusted to fit the flange end face of the slab 1 at both ends in the length direction. A plurality of impact hammers 7a with a small length and a plurality of impact hammers 7b with a large length adjusted to fit the lower surface of the web of the slab 1 are installed in the central part in a stacked manner.

The shaft 15 of the rotating rotor 6 is connected to a rotation drive device 16 installed on the lifting frame, and the rotation rotor 6 can be rotated in forward and reverse directions by the rotation drive device 16. There are guide shafts 1 on both sides of the lower part of the lifting frame 13.
7 is fixed vertically and guided by a guide tube 18,
Further, a hydraulic lifting cylinder 19 is connected to the center of the lifting frame 13. When the elevating cylinder 19 is telescopically operated, the rotary rotor 6 is vertically raised and lowered integrally with the elevating frame 13 while the guide shaft 17 is guided by the guide tube 18 .

On the other hand, as shown in FIG. 1(b), the centrifugal impact type inclined section torch sag removing device 12 has pins 8' arranged along the circumferences of a pair of left and right rotating rotors 6'. A plurality of impact hammers 7c of different lengths adjusted to fit the inclined surface on the inner surface of the flange of the slab 1 are attached to the pin 8' so as to gradually increase in length from the outside to the inside. The pair of left and right rotating rotors 6' can be rotated in the forward and backward directions by respective rotational drive devices (not shown), and are raised and lowered in diagonal directions indicated by arrows toward the inner surface of the flange by means of lifting cylinders (not shown). be.

As shown in FIG. 3, the slab 1 conveyed by the table roller 10 is first detected by a position detection sensor 20a.
The tip or rear end position of the slab 1 is detected, and the rotating rotor 6 is started to rotate by driving the rotation drive device 16. At this time, the tip of the slab 1 is rotated clockwise, and the rear end is rotated counterclockwise, and the impact hammers 7a and 7b are raised by centrifugal force. Next, when the tip or rear end of the slab 1 comes to the position of the position detection sensor 20b, the tips of the impact hammers 7a, 7b attached to the rotating rotor 6 are raised to the torch sag removal position using the lifting cylinder 19, Torch sag on the web surface (A) and the flange end surface (C) is knocked off by striking hammers 7a and 7b. Furthermore, when the front end or rear end of the slab 1 comes to the position of the position detection sensor 20c, the rotating rotor 6 is lowered by the lifting cylinder 19, and then the rotation drive device 16 is stopped to stop the rotation.

Similarly, when the front end or rear end of the slab 1 comes to the position of the position detection sensor 20d, the pair of left and right rotating rotors 6' start rotating. For the tip, rotate clockwise; for the rear end, rotate counterclockwise. When it reaches the position of the position detection sensor 20e, the rotating rotor 6' is raised diagonally and the striking hammer 7c
is placed on the inclined surface of the inner surface of the slab 1, and the torch sag on the inner surface of the flange is knocked off. When the rotor 6' reaches the position of the position detection sensor 20f, the rotor 6' is lowered and then stopped.

The basic shape of the impact hammer 7 is such that the cutting edge 7a is symmetrical as shown in FIG. 1(c), and the left and right sides can be interchanged. Further, by adjusting the length, it can be made to correspond to the irregular cross-sectional shape of the beam blank slab. Furthermore, since it expands and rises due to centrifugal force, it has the advantage that the torch sag removal function can be maintained even if the size and shape change somewhat. In the above embodiment, the planar torch sag removing device 11 is arranged on the upstream side of the pass line, and the inclined section torch sag removing device 12 is arranged on the downstream side, but the order can also be reversed.

[0017]

As described above, according to the present invention, it becomes possible to use a centrifugal impact type torch sag removing device to remove torch sag from beam blank slabs, which has been difficult in the past. Torch sag adhering to the flat part and the inclined part of the beam blank slab can be removed separately on the conveyance path line of the slab, and the combined effect can improve the removal efficiency of torch sag. Further, since the impact hammer has a long lifespan with little damage and can be replaced for several years, the cost for removing torch sag can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic side view showing the overall arrangement of the present invention.

FIG. 3 is a schematic side view showing the usage situation of the present invention.

FIG. 4 is a front view showing the shape of a beam blank slab.

FIG. 5 is a side view showing a conventional example.

[Explanation of symbols]

1 Beam blank slab 2 Cutting torch 4. Conventional torch sag removal device 5 Slab guide 6 Rotating rotor 7. Hitting hammer 8 pin 9 Torch sauce 10 Table roller 11 Flat surface torch sag removal device 12 Slope torch sag removal device 13 Lifting frame 14 Bearing 15 Shaft 16 Rotary drive device 17 Guide shaft 18 Guide tube 19 Lifting cylinder 20 Position detection sensor

Claims (1)

[Claims] 1. An apparatus for removing torch sag from beam blank slabs, which is disposed on a pass line for conveying beam blank slabs that have been cut by a torch and have torch sag attached to the lower part, the apparatus comprising: a web surface of the beam blank slab; A centrifugal impact type torch sagging removal device equipped with a flat impact hammer adjusted to a length that fits the end face of the flange, which can be raised and lowered; and an inclined impact hammer that has a length adjusted to fit the inner surface of the flange of the beam blank slab. A torch sag removing device for a beam blank slab, characterized in that a centrifugal impact type torch sag removing device that is movable up and down is arranged in series in series with a pass line for conveying the beam blank slab.