JPS6326172B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slag removal device used in repair work for vacuum degassing RH furnaces and the like.

Since both the suction pipe and the discharge pipe in an RH furnace are immersed in the molten metal, they are prone to erosion and require frequent replacement, while slag or molten metal often sticks to their surrounding surfaces after degassing. Several proposals have been made to remove such slag and the like, one of which is a slag removal device described in Japanese Utility Model Publication No. 52-56322. In this device, slag is removed by lifting and lowering the two half cutter pieces which together form a cylindrical cutter, and the half cutter pieces are also movable in the radial direction. However, although the cutter piece in this slag removal device is made up of two halves as mentioned above, it is essentially a cylindrical cutter, and when this cutter moves up and down, it removes slag from the entire outer periphery of the suction pipe or discharge pipe. It has the disadvantage that it gets stuck in the refractory and cannot be removed. Also, remove unnecessary areas at the same time.
There have been problems in this respect, such as abnormal biting or excessive cutting load.

In view of the above-mentioned problems, the present invention makes one cutter piece of the required arc width movable up and down, and swingable,
Furthermore, by making the cutter pieces movable in the radial direction, the cutter pieces can be made to face only the areas where the slag is adhered, allowing the slag to be removed efficiently and the slag removal device to prevent abnormal biting of the cutter pieces and abnormal cutting loads. The purpose is to provide.

The present invention places a turntable under the RH furnace,
A cutter piece of a required width is set upright on the same turntable, and the cutter piece is movable up and down along the outer peripheral surface of the suction pipe or the discharge pipe, and the cutter piece is moved by rotation of the turntable. This invention relates to a slag removal device for an RH furnace or the like, characterized in that the suction pipe or the discharge pipe is rotatable, and the cutter pieces are movable in the radial direction.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The slag removal device according to the present invention will be specifically described below with reference to an embodiment shown in the accompanying drawings (FIGS. 1 to 3).

In this embodiment, the slag removal device is shown built into an RH furnace repair truck. As shown in the figure, an upper machine frame 2 that can be raised and lowered is installed on a trolley 1 that runs directly under the RH furnace, and a large turntable with a rotational drive device on the upper surface of the upper machine frame 2 has a center of rotation that is the same as the center of the RH furnace. Table 3 is installed,
A slag removal device according to the present invention is placed at an eccentric position on the turntable 3 of the same size. The device is
Substantially in the eccentric position, the rotary drive device 4 is located at the bottom.
A small turntable 5 with It is formed by standing up a cutter piece 6 with a knife edge formed thereon. The cutter piece 6 moves up and down the outer peripheral surface of the suction pipe A or the discharge pipe B as the upper machine frame 2 goes up and down, and moves around the suction pipe A or the discharge pipe B by the rotation of the small turntable 5. It is configured to rotate. In this embodiment, the cutter piece 6 is raised and lowered by raising and lowering the upper machine frame 2, but a fluid pressure cylinder or the like may be provided at the lower part of the small turntable 5 as a lifting device for the cutter piece 6. is also possible.

Further, on the small turntable 5, there is a hydraulic cylinder 7 whose tip end is connected to the center of the lower end of the cutter piece 6 and which moves the cutter piece 6 in the radial direction.
and a guide 8 are arranged. In this embodiment, the cutter piece 6 is moved in the radial direction by the hydraulic cylinder 7, but it is also possible to use a motor, pinion, or rack as another method. Regarding the other components of the RH furnace repair cart in this embodiment, reference numeral 9 is an inner surface blowing pipe device, 10 is an outer surface suction pipe device, and 11 is a television camera device.

Next, the operation of the slag removal device having the above configuration will be described. First, drive the traveling truck 1 and connect the slag removal device to suction pipe A or discharge pipe B of the RH furnace.
bring it directly below. Next, the rotary drive device 4 is driven to rotate the small turntable 5, and the hydraulic cylinder 7 is operated to move the cutter piece 6 in the radial direction along the guide 8, so that the upper end of the cutter piece 6 is connected to the suction pipe. Bring it to a position that aligns with the required part to be peeled on the outer circumferential surface of the discharge pipe A or B, and then drive the lifting device to lift the inferior arc-shaped cutter piece 6 integrally with the upper machine frame 2 to peel off the adhered slag. Then, the cutter piece 6 is lowered and the small turntable 5 is rotated to similarly turn the cutter piece 6 to the place where the slag is stuck, and the same action as above is performed to remove the adhered slag from the entire outer periphery. It removes reliably and efficiently.

The present invention, which is constructed and operates as described above, has the following effects.

(1) Only the parts that require peeling can be sequentially peeled off as the turntable rotates, and the adhered slag can be efficiently peeled off.

(2) By cooperating the radial moving device with the turntable, abnormal biting of the cutter piece and abnormal cutting load can be prevented.

(3) If the upper machine frame is lifted together, the device will have sufficient cutting force.

[Brief explanation of drawings]

1 is a front view of an embodiment of the present invention, FIG. 2 is a plan view, and FIG. 3 is a longitudinal sectional view taken along arrow II in FIG. 4: Rotation drive device, 5: Small turntable,
6: Cutter piece, 7: Hydraulic cylinder, 8: Guide.

Claims (1)

[Claims] 1 Place a turntable under the RH furnace, place one cutter piece of the required width on the turntable,
The cutter piece is movable up and down along the outer circumferential surface of the suction pipe or discharge pipe, and the cutter piece is made freely pivotable around the suction pipe or discharge pipe by rotation of the turntable, and A slag removal device for an RH furnace, etc., characterized in that the cutter pieces are movable in the radial direction.