JPS6323478B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scum suction method and a scum suction device used to carry out the scum suction method.

When removing scum from a molten metal surface by suction, a method is known in which the scum suction port is positioned at an appropriate distance from the scum surface and the scum is suctioned through the scum suction port. If you leave a distance between the scum suction port and the scum surface like this,
It is possible to apply water to the scum sucked from the scum suction port and solidify it on the spot, thereby facilitating the transfer of the scum within the suction pipe communicating with the scum suction port and subsequent processing.

The shorter the distance between the scum suction port and the scum surface, the higher the scum suction efficiency, but if it is too short, the molten metal will be sucked from the scum suction port, which is dangerous. Therefore, scum suction is performed by leaving a predetermined distance between the scum surface and the scum suction port so that scum can be suctioned efficiently and safely. In this way, in order to maintain a constant distance between the scum suction port and the scum surface,
Conventionally, an electrode rod is provided near the scum suction port with one end located closer to the scum surface than the scum suction port, and when a potential is applied to the electrode rod and one end of the electrode rod comes into contact with or comes close to the scum surface. A scum surface detection device has been proposed that detects changes in the potential of scum. That is, it has been proposed to safely and efficiently suction scum by controlling the position of the scum suction port so that one end of the electrode rod is always in contact with or close to the scum surface.

However, in such a scum suction method, when scum adheres to one end of the electrode rod and hardens, the electrode rod is extended by the amount of adhering scum, resulting in a gap between the scum suction port and the scum surface. There was a problem that the suction efficiency decreased as the distance became longer.

Therefore, the purpose of the present invention is to solve such problems, and the first aspect of the present invention is that when scum adheres to an electrode rod, another electrode rod is brought out in the position of the electrode rod, so that the problem can always be fixed. To provide a method in which efficient scum suction can be continued by controlling the position of a scum suction port using an electrode rod to which scum is not attached.

A second aspect of the present invention provides a scum suction device equipped with a scum surface detection device that can quickly and accurately draw out the other electrode rod.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In FIG. 1, M is a molten metal with scum S floating on its surface. 1 is a suction tube whose other end is connected to a suction device (not shown) via a scum separator (not shown); 2 is a suction head constituting one end of the suction tube; Mouth 2a is open. Reference numeral 3 denotes a support member that supports one end of the suction tube 1 in a three-dimensionally movable manner, and controls the position of the suction head 2 by a drive device not shown. 4 is a scum surface detection device attached to the side of one end of the suction pipe 1, and is a scum surface detection device that detects scum S by a length h from the scum suction port 2a.
It has an electrode rod 5a with one end disposed near the surface. As shown in FIGS. 3 and 4, the scum surface detection device 4 includes a plurality of electrode rods 5a to 5n.
a holding device 6 that holds the scum on one axis and has a gripping portion 7 at one end 6a on the scum suction port 2a side, and a first position where the holding device 6 enters the other end 6b of the holding device 6 on the axis and The electrode rods 5a to 5n in the holding device 6 are pushed and moved from the other end 6b side of the holding device 6 toward the one end 6a side by reciprocating between the separated second position shown by the solid line in FIG. Pushing member 8
It is equipped with Reference numeral 9 denotes an electrode rod supplying device disposed between the other end 6b of the holding device 6 and the pushing member 8 at the second position, which holds a plurality of supplementary electrode rods 10 in parallel and parallel to the axis. and hold those supplementary electrode rods 10 between the other end 6b of the holding device and the second
It has means such as an inclined surface 11 and a spring that bias it toward the position on the axis between the pushing member and the pushing member. Note that the electrode rods 5a to 5n and 10
is made of the same material as the molten metal M.

Next, the detailed structure of the scum surface detection device 4, which is composed of the holding device 6, the pushing member 8, and the electrode rod supplying device 9, will be explained. Reference numeral 12 is an outer cylinder of the holding device 6, and a thick boss portion 13 is provided at one end of the outer cylinder. The through hole 14 in the axial direction of the boss portion 13 is provided with a tapered surface 15 that slopes toward the other end. An inner cylinder 16 having an inner diameter slightly larger than the diameter of the electrode rods is disposed at the axial center of the outer cylinder 12 to guide and hold the electrode rods 5a to 5n. A thick wall portion 17 is provided at one end of the inner cylinder 16, and a portion of the thick wall portion 17 protrudes from the boss portion 13. It has a tapered surface 18 that abuts against the tapered surface 15, and this boss portion 13 and thick portion 17 constitute the grip portion 7. A spring receiver 19 is attached to the outer periphery of the other end of the inner cylinder 16 so that its position can be adjusted, and the inner cylinder 16 is biased toward the other end between the spring receiver 19 and the boss portion 13. A spring 20 and a distance piece 21 are interposed. Therefore, the biasing force of the spring 20 and the tapered surfaces 15 and 1
The thick portion 17 is biased to reduce its diameter by the abutment of 8.
Hold the electrode rod 5a. The other end of the outer cylinder 12 is
It is fixed to a holding block 22 for electrode rods constituting the electrode rod supply device 9. This holding block 22 is provided with an inclined groove 23 for guiding and holding the supplementary electrode rods 10 in parallel in a line, and the inner cylinder 1
A through hole 24 that opens at the bottom surface of the inclined groove 23 is bored at the same axial position as the groove 6 . 25 is the inclined groove 23
With a stopper provided at the side position of the inner through hole 24,
The supplementary electrode rod 10 is positioned on the same line as the axes of the inner tube 16 and the through hole 24, and guided into the inner tube 16 through the through hole 24. The inclined groove 23
The inclined surface 11 consisting of the bottom surface urges the electrode rod 10 toward the stopper 25. A cylinder device 27 for driving the pushing member 8 is mounted on the side of the holding block 22 opposite to the side to which the other end of the outer cylinder 12 is fixed, and is connected to the inner cylinder 16 via a mounting bracket 26.
is fixed on the same axis as the One end of the pushing member 8 protrudes through an end block 29 at one end of the cylinder device 27, and the other end of the pushing member 8 is connected to a piston 28 that can reciprocate within the cylinder.
is fixed. An air supply port 31 is provided in an end block 30 at the other end of the cylinder device 27, and a spring 32 for returning the piston 28 is built in between the piston 28 and the end block 29.

The scum surface detection device 4 having the above structure is fixedly supported on the suction head 2 and the suction tube 1 via attachment devices 40a and 40b arranged at two locations on the holding device 6 at intervals in the axial direction. next,
These attachment devices 40a, 40b will be explained with reference to FIG. Support rods 41a and 41b are connected to the suction head 2 and the suction tube 1 toward the holding device 6, respectively.
A bolt 44 extends through the tips of the support rods 41a, 41b and is attached to each support rod 41a, 41b with a nut 43 via a pair of insulating materials 42.
a, 44b are provided. The bolts 44a and 44b each pass through one end and the nut 46
Support plates 45a, 45b fixed to each bolt 44a, 44b are provided, and the support plates 45a, 45b are fixed to each bolt 44a, 44b.
The other end portions of 45b are fitted onto the holding device 6, respectively. One support plate 45a and the holding device 6 are fixed by welding, and the other supporting plate 45b supports the holding device 6 so as to be able to slide relative to each other in the axial direction, so that the difference in expansion and contraction due to heat can be absorbed. There is.

Next, a scum suction method using the above device will be explained. First, the mounting device 4 of the scum surface detection device 4
The distance h between one end of the electrode rod 5a and the scum suction port 2a is adjusted to a predetermined length by manipulating the nut 46 of 0a. Thereafter, a suction device (not shown) connected to the other end of the suction tube 1 is driven, and the supporting member 3 is manipulated by the driving device (not shown) to move the suction head 2 so that the scum suction port 2a faces the scum surface. and gradually move the suction head 2 toward the scum surface. When one end of the electrode rod 5a comes into contact with or near the scum surface and the voltage applied to the electrode rod 5a changes, the movement of the suction head 2 is stopped by detecting the change, and the scum S is efficiently removed from the scum suction port 2a. is attracted to. When the scum surface position changes as the scum S is attracted, the electrode rod 5a and the scum surface separate from each other, so the voltage applied to the electrode rod 5a changes and this is immediately detected, and the driving device is activated in the same way as above. The distance between the scum suction port 2a and the scum surface is always maintained. Efficient scum suction is thus ensured. When scum S adheres to the electrode rod 5a during such scum suction operation, as shown in FIG. The position of the suction head 2 is controlled so that the distance h' from the scum surface becomes larger than the distance h by the length of the adhered scum S', resulting in a decrease in scum suction efficiency. When the operator confirms that scum has adhered to the electrode rod 5a, he presses a push button (not shown) that opens a solenoid valve (not shown) for supplying air to the cylinder device 27. Then, the pushing member 8 pushes the first part that has entered the other end 6b of the holding device 6.
One end of the holding device contacts the electrode rod 5n and moves it toward the one end 6a side of the holding device to the position of the electrode rod 5m. As a result, electrode rod 5
M to 5b also move toward the one end 6a side of the holding device, and the electrode rod 5b comes to the position of the electrode rod 5a. Therefore, the electrode rod 5a is detached from the holding device 6, falls into the molten metal M, and is melted. In this way, the electrode rod 5a with scum attached becomes scum-free.
Furthermore, the new electrode rod that has been fed out to the position of the original electrode rod 5a replaces it, and efficient scum suction can be continued. Note that during this operation, when the electrode rod 5n is pressed by the pushing member 8, the grip part 7 that was holding the electrode rod 5a is also pressed toward one end of the holding device, resisting the biasing force of the spring 20. Since the tapered surfaces 15 and 18 move loosely, the gripping force of the electrode rod 5a by the gripping part 7 is weakened, and the electrode rod 5a is smoothly pushed out.
is rolled out. The solenoid valve for supplying air to the cylinder device 27 is switched after a certain period of time by a timer, the air supply port 31 of the cylinder device 27 is opened to the atmosphere, the piston 28 is moved back by the spring 32, and the pushing member 8 returns to its original second position. Then, one of the supplementary electrode rods 10 of the electrode rod supply device 9 is further moved along the inclined surface 11 to the stopper 25.
After moving until it comes into contact with the electrode rod 5n, it moves to the original position of the electrode rod 5n and enters the holding device 6. In this way, the series of operations for replacing the electrode rod 5a is completed. again,
Needless to say, if scum adheres to the electrode rod 5a, the same operation as described above is repeated, and efficient scum suction is continued.

Note that in the above embodiment, a case was shown in which the pushing member 8 reciprocated between the first position where it entered the holding device 6 and the second position where it was separated from the holding device 6.
The configuration may be such that the pushing member 8 penetrates into the holding device 6 in several stages so as to sequentially push out the plurality of electrode rods inside the holding device 6.

As is clear from the above explanation, according to the scum suction method of the present invention, even if scum adheres to the electrode rod, the electrode rod with scum attached can be immediately replaced with another electrode rod, so that scum suction can be interrupted. Efficient scum suction can be continued without any problems. Further, according to the scum surface detection device of the present invention,
The electrode rod can be quickly replaced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall side view showing a scum suction state, FIG. 2 is a partial side view showing a scum suction state when scum is attached to an electrode rod, and FIG. FIG. 4 is a vertical cross-sectional view of one half of the scum surface detecting device, FIG. 4 is a vertical cross-sectional view of the other half of the scum surface detecting device, and FIG. 5 is a vertical cross-sectional view of the mounting device of the scum surface detecting device. . 1... Suction tube, 2... Suction head, 2a
...Scum suction port, 4...Scum surface detection device,
5a to 5n...electrode rod, 6...holding device, 7...
Grip portion, 8...Pushing member, 9...Electrode rod supply device, 10...Replenishment electrode rod, 12...Outer cylinder, 15...
... Tapered surface, 16 ... Inner cylinder, 17 ... Thick wall part, 1
8... Tapered surface, 20... Spring, 22... Holding block, 23... Inclined groove, 27... Cylinder device.

Claims (1)

[Claims] 1. Detecting the surface of scum with an electrode rod, suctioning the scum while maintaining a constant distance between the scum surface and the scum suction port, and when scum adheres to the electrode rod. A scum suction method characterized by continuing scum suction by extending another electrode rod to the position of this electrode rod. 2. A scum surface detection device that can detect the surface of scum with an electrode rod is installed near the scum suction port,
A device capable of suctioning scum while maintaining a constant distance between the scum surface and a scum suction port,
The scum surface detection device includes a holding device that holds a plurality of electrode rods on one axis and has a gripping portion for the electrode rods at one end on the scum suction port side, and a holding device that holds the electrode rods inside the holding device. a pushing member that presses and moves from the other end side toward the one end side, and causes the tip of the one electrode rod located closest to the one end to protrude outward from the holding device beyond the gripping part. A scum suction device characterized by: