JPH0129618B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for inserting an iron plate into a mold when changing the steel type in continuous casting for steel manufacturing.

In the production of steel by continuous casting, when changing steel types, two types of molten steel are stirred and mixed at the time of joining, so after casting, this dissimilar mixed portion is usually cut off and removed as a defective product.

The present invention has been made in view of the above, and by inserting an iron plate into the mold when changing steel types, the stirring and mixing of different types of molten steel is suppressed as much as possible, thereby eliminating the mixed parts of different types as defective products. It is an object of the present invention to provide an iron plate insertion device for continuous casting that can reduce the amount of steel and improve the yield.

Embodiments of the present invention will be specifically described below based on the drawings. First, the outline of the continuous steel casting machine shown in FIG. 1 will be explained. The molten steel injected into the mold 4 from the ladle 1 through the tundish 2 and nozzle 3 is poured into the mold 4 with its surface layer solidified.
After passing through the roller apron 5, the steel is pulled out by the rolling rolls 6, and after solidifying to the center, it is cut to the required size, thus producing a steel bar or copper plate.

The iron plate insertion device of the present invention is installed in the above-described continuous casting machine to insert an iron plate for suppressing agitation into the mold 4 by utilizing the gap between the nozzle 3 and the mold 4 when changing the steel type. Something,
The details will be explained below based on FIGS. 2 to 6. As shown in the figure, two iron plate loading arms 11 are installed near both sides of the tundish tray 2, each with a support shaft 12.
The carrying-in arms 11 are mounted so as to be rotatable (swivelable) in the horizontal direction through
It is designed to be rotated to a standby position (iron plate supply position) spaced apart from the mold 4. Note that the carry-in arm 11 is formed in a hollow shape. Also,
The center of rotation of the carry-in arm 11 is set at a point away from the movement locus of the tundish 2, which is capable of moving laterally on the rail 2a, and when it is in the standby position, it is used for repair or heating of the tundish 2. It is designed so that movement to each position is not obstructed.

At the tip of each carry-in arm 11, there are two first guide rods 1 that are parallel to each other in the vertical (up and down) direction on both sides of the front.
3 is fixed to the support base 14 with the support base 14
A movable body 15 is located in front of the first guide rod 13.
The movable body 15 is vertically moved by a piston rod 17 of an insertion cylinder 16 vertically attached to the support base 14. The movable body 15 has two second rods extending horizontally and parallelly toward the front on both sides of its front surface.
The gripper holder 22 is attached to the second guide rod 18 so as to be movable back and forth, and the gripper holder 22 is attached to the piston rod 20 of the positioning cylinder 19 attached to the movable body 15.
It is moved forward and backward by. Note that since this positioning cylinder 19 moves up and down together with the movable body 15,
A relief hole 21 of a required length to allow vertical movement of the cylinder 19 is formed in the support base 14, and a required relief notch is formed in the carry-in arm 11 if necessary.

The gripper holder 22 extends horizontally in the lateral direction, and has a pair of left and right opening/closing arms 23 at both ends thereof.
A gripper 24 for gripping an iron plate is mounted so as to be movable in the lateral direction via, for example, a dovetail groove 25 as shown in the figure. be moved. Although not shown, the gripper 24 has a built-in cylinder, for example, as a drive device for opening and closing the opening/closing arm 23. Also, the iron plate 29 to be inserted
is formed to be slightly smaller than the injection port 4a of the mold 4, and has a rod portion 29a on one side of the upper surface.

The iron plate insertion device of this embodiment is constructed as described above, and its operation will be explained below. During steady operation of the continuous casting machine, this equipment rests in the standby position shown by the imaginary line in Figure 2. In such a state, when the continuous casting machine is used to make steel of a different type, that is, when changing the type of steel, the equipment is stopped. An operating command is given to the device. Based on this operation command, the opening/closing arm 23 of each gripper 24 first grasps the bar 29a of the iron plate 29 to be inserted placed on the pedestal 28, and then the loading arm 11 moves to the tandate as shown by the solid line in FIG. It is rotated to the loading position close to 2. After that, the positioning cylinder 16
is actuated to move the gripper holder 22 forward along the second guide rod 18.
As shown in FIG.
When it reaches a position directly above the injection port 4a of the mold 4, it is stopped. In this state, the insertion cylinder 16
is activated, and the gripper holder 2 is moved together with the movable body 15.
2 and the gripper 24 are lowered, and the iron plate 29 is inserted into the injection port 4a of the mold 4 and submerged into the molten steel to a predetermined depth. When the iron plate 29 is inserted, the lateral movement cylinder 26 is actuated to slightly move the gripper 24 laterally to bring one end edge of the iron plate 29 into contact with the inner wall of the injection port 4a. Since a slug is usually attached to this inner wall, the iron plate 29 is welded and held to the slug. In this case, by setting the horizontal movement direction of the gripper 24, that is, the iron plate 29, toward one corner of the injection port 4a, it is possible to weld and hold the two edges of the iron plate 29 to the inner wall of the injection port.

In addition, in this device, after welding and holding the iron plate 29 in the mold 4, each member is returned to its original position by a cylinder or the like as a respective drive device.
It waits in the standby position until the next steel type change.

In this way, the insertion of the iron plate 29 into the mold 4 by this device is completed, but this iron plate is inserted before the changed molten steel is injected into the mold 4 from the nozzle 3 when changing the steel type, that is, when the tundish 2 is empty. The operation timing is adjusted so that the operation is performed when the molten steel before the change completes flowing out from the nozzle 3. As the iron plate 29 is inserted, the flow force of the molten steel injected from the nozzle 3 into the mold 4 is weakened, and as a result, the stirring distance of the molten steel after the change relative to the molten steel before the change in the mold 4 is shortened. Therefore, the length of the mixing portion of different types of molten steel when converting to molten steel due to a change in steel type is reduced. Note that the iron plate 29 in the mold 4 is melted and mixed into a mixed portion of different types of molten steel during the molten steel conversion process.

In addition, since this device inserts the iron plate 29 through the gap between the mold 4 and the nozzle 3, it is necessary to avoid interference with the tundish 2 or the mold 4.
2 or the gripper 24, etc., whose shape and size are set in accordance with the shapes of the tundish 2 and the mold 4, taking into account the above-mentioned interference problem,
The present invention is not limited to what is shown in the drawings, and the forward and backward movement of the gripper holder 22 may be omitted in some cases.

As described in detail above, according to the present invention, when changing the steel type during steel making work using a continuous casting machine, stirring and mixing of different types of molten steel can be suppressed as much as possible by inserting an iron plate into the mold. It is possible to improve the yield by reducing the number of dissimilar mixed parts as defective products that inevitably occur, and is extremely useful as an iron plate insertion device for continuous casting.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram of a continuous casting machine, FIG. 2 is a plan view schematically showing a steel plate insertion device, FIG. 3 is a side view, and FIG. 4 is a schematic diagram of a steel plate insertion device. FIG. 5 is a front view, and FIG. 6 is a side view. 1... Ladle, 2... Tundishyu, 3... Nozzle, 4... Mold, 11... Carrying arm, 1
5...Movable body, 22...Gritzpa holder, 24
... Gritspa, 29... Iron plate.

Claims (1)

[Claims] 1. A device for inserting an iron plate into a mold when changing the steel type in continuous casting, including a carry-in arm for carrying the iron plate to a position above the mold, and a gripper provided at the tip of the carry-in arm for gripping the iron plate; An iron plate insertion device for continuous casting, comprising means for vertically moving the gripper to insert the iron plate into a mold, and means for horizontally moving the gripper to weld the inserted iron plate to the inner wall of the mold.