JPS6243095A - Electrode rod oxidation preventing agent coater for electricfurnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for applying an antioxidant to an electrode rod of an electric furnace to suppress wear and tear.

Conventional technology In electric furnaces for steelmaking, an electrode rod is held and suspended by a gripping device that is also used as a general ffi, and the electrode rod is inserted into the furnace through a lid plate, and the raw material is heated by applying electricity to the electrode rod. The tip of the electrode used in this electric furnace gradually wears out during the melting operation, and is lowered into the furnace one after another depending on the area of wear. By the way, it is said that 50-60% of this fi electrode rod wear is due to oxidation wear other than arc wear for melting the raw materials, and in order to prevent this oxidation wear, it is necessary to apply an antioxidant to the surface of the electrode rod. Although it is not well known that it is sufficient to do this, it is actually done.1 Normally, a non-conductive antioxidant is used because the material cost is low, so the surface of the electrode rod is If the electrode rod is coated with an antioxidant, it will not be possible to conduct electricity to the electrode rod. Therefore, as long as a non-conductive antioxidant is applied, a method of pre-coating the electrode rod cannot be adopted.

Therefore, conventionally, for example, as shown in Japanese Utility Model Publication No. 50-29965 and Japanese Utility Model Publication No. 51-38933, the electrode rod is removed from the gripping device each time before being lowered into the furnace, and a new one is removed. The method used was to coat the part inserted into the furnace with an antioxidant, but this was time-consuming and extremely inefficient.

In addition, Japanese Utility Model Publication No. 53-9976 discloses a method for applying antioxidant without removing the electrode rod from the gripping device, in which a ring-shaped nozzle mounting body is attached to the top surface of the lid plate of the furnace so as to surround the electrode rod. A method has been disclosed in which an antioxidant spray nozzle is attached to the inner surface of the electrode rod and the antioxidant is sprayed onto the surface before lowering the electrode rod, but since the nozzle is constantly exposed to high temperatures, oxidation Not only is it easy for the inhibitor to dry out and clog the nozzle, but the nozzle itself is easily damaged by heat, and this requires frequent maintenance and inspection. - Since the device was installed on the F side, there was a problem that maintenance and inspection could not be easily performed.

The present invention has been completed in view of the above points, and the present invention sprays antioxidant from a nozzle while holding the electrode rod with a gripping device, and applies the antioxidant to the uncoated portion of the electrode rod. In addition, when not in use, the nozzle can be retracted to the side of the electric furnace to prevent it from being exposed to high temperatures and to facilitate maintenance and inspection work. It is an object of the present invention to provide an antioxidant coating device for an electrode rod of an electric furnace.

Means for Solving the Problems [1] In order to achieve the above-mentioned [Object 1], the electrode rod antioxidant T''f! of the present invention is gripped and hung by a gripping device that also serves as energization. In an electric furnace in which an electrode rod is inserted into the furnace through a lid plate, the protruding portion between the gripping device and the lid plate of the electrode rod is approached from both sides to surround the electrode rod, and separated from each other. An antioxidant jetting device having an antioxidant jetting nozzle attached to the corresponding surfaces of a pair of nozzle attachment bodies for releasing the encirclement in 11η is configured to be retractable to the side of the electric furnace. It is.

Function The present invention has the above-mentioned configuration, and when the melting work is completed, @
When the horizontal bar is lowered according to the amount of consumption, the antioxidant jetting device moves from the side of the electric furnace to the top of the furnace, and the pair of nozzle mounting bodies are inserted between the electrode rod gripping device and the furnace cover plate. Approach the exposed part from both sides and surround the horizontal bar with 1 yen. Antioxidant is sprayed from the antioxidant spray nozzle attached to the corresponding surface of the nozzle mounting body, and the antioxidant is applied to the surface of the electrode rod. is applied, and when the application work is completed, the pair of nozzle attachment bodies separate from each other to release the surrounding of the electrode rod, and the antioxidant spraying device retreats to the side of the electric furnace, and the electrode rod Antioxidant can be applied to the unapplied part of the electrode rod that is newly inserted into the furnace while the electrode rod is being held in the gripping device. Since the device is retracted to the side of the electric furnace, the antioxidant jetting nozzle is not exposed to high temperatures for a long period of time, and maintenance and inspection of the antioxidant jetting nozzle can be easily performed if necessary. can.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In the figure, reference numeral 1 denotes an electric furnace, in which three electrode rods 3 are each held by a gripping device [4] and suspended, and inserted through an insertion hole 6 of a cover plate 5. By applying electricity to each electrode rod 3 through the gripping device 4 and heating it, the scrap stored in the furnace body 2 is melted, and during this melting, the electrode rod 3 becomes tapered and gradually wears out. After the melting operation is completed and the molten metal is discharged from the furnace body 2 and new scrap is introduced, each gripping device 4 is loosened and the electrode rod 3 is lowered until it hits the bottom of the furnace body 2, and the gripping device 4 is lowered until it hits the bottom of the furnace body 2. Device 4
is lowered by a certain distance, grips the electrode rod 3 again, and then ascends back to its original position, and the melting operation is performed again. A column 8 is erected on the side of the electric furnace 1, and the tip of the column is attached to a bracket 9 fixed to the upper end of the column. The proximal end of the multi-joint arm 11 reaching the upper surface is attached.

The above multi-joint arm 11 has four joints, and the base end of the first arm 12 is pivotally supported by the bracket 9 so as to be able to swing freely. The second arm 12 is dynamically driven, and a second
7-The base end of the arm 11 is pivotally supported to freely swing and is driven to swing by the second servo motor IR.
The base end of the third arm 16 pivots freely at the tip of the 4!
37-1= ] 6, and is designed to be oscillated by the third servo motor 17.
A vertically long mounting body 19 having a constant width is pivoted freely around the center of the lower end in the width direction, and is swung by a fourth servo motor 20! ψIt is like being moved,
This multi-joint arm 11 is bent at each joint and can be expanded and contracted arbitrarily to move in the tree direction.

Vertical guide rods 22.22 are provided on both sides of the mounting body 19 on both sides of the swing center, and these guide rods 22.22
An elevating body 23 is inserted through insertion holes 24.24 at both ends thereof and is supported so as to be able to rise and fall freely, and a rodless cylinder 26 is installed vertically on the rear side of this elevating body 23. Reference numeral 26 is such that by reciprocating a piston 28 fitted in a cylinder 27, a connecting portion 29 protruding from the piston 28 is reciprocated along a cut groove 30 formed over the entire length of the cylinder 27. By fitting the pin 32 implanted in the connecting portion 29 of this rotless cylinder 26 into the fitting groove 34 of the connecting plate 33 fixed to the rear surface of the lowering body 23,
The connecting portion 30 and the elevating body 23 are connected, and an antioxidant spraying device 36 is attached to the front surface of the elevating body 23.

This antioxidant jetting device 36 has a pair of semi-annular nozzle attachment bodies 37, 37 whose base ends are connected to the above-mentioned elevating body 23.
Shafts 39.3 are attached to both ends of the mounting portion 38 protruding from the front surface of the
The air cylinders 4 are mounted on brackets 40 and 40, which are supported in a freely swinging manner at 9 and protrude from both ends of the rear surface of the elevating body 23.
1.41 is attached, and the tip of the piston rod 42.42 is attached to the nozzle mounting body 37.3.
7, and by extension of both piston rods 42, 42, the nozzle mounting body 37, as shown in solid lines in FIG.
．． 37 closes to form a ring shape and surround Makki's electrode rod 3,
Due to the contraction of both piston rods 42, 42, the nozzle mounting bodies 37, 37 open and release the enclosure, as shown by chain lines in the same figure.
On 7.37.

A total of five antioxidant spray nozzles 1 for spraying antioxidant are attached by mounting plates 45 at equal angular intervals, each facing the center of the annular shape, and each antioxidant spray nozzle 44 is connected to a hose (not shown). The pair of nozzle mounting bodies 37.37 are connected to the antioxidant pumping device.
There are a total of 10 air jet nozzles 46 that jet pressurized air.
The pieces are oriented toward the center of the annular shape, and are installed in a radial arrangement with slightly different heights,
Each air jet nozzle 46 is connected to a source of pressurized air via a hose, also not shown.

Next, the operation of this embodiment will be explained.

During the melting operation, the multi-jointed arm 11 is folded as shown by the chain line in FIG.
When the arm 3 is lifted and gripped again by the gripping device 4, each arm 12.14 and 1 is
6 swings while the multi-joint arm 11 extends, and while the mounting body 19 swings and adjusts its orientation, the antioxidant spraying device 36 applies the antioxidant to one electrode rod 3. As it gradually approaches, the air cylinder 41
The piston rod 42 of the nozzle mounting body 37.3 is extended.
7 opens, and with continued approach, the nozzle mounting body 37.3
7 pinches the exposed part between the gripping device 4 of the electrode rod 3 and the cover plate 5, and when the electrode rod 3 is located at the center of the annular shape, the drive of the multi-joint arm 11 stops, and at the same time, the piston of the air cylinder 41 The rod 42 contracts and the nozzle mounting body 3
7.37 is closed and the electrode rod 3 is surrounded. Then, the rodless cylinder 26 starts and the nozzle mounting body 37.3
7 reciprocates up and down, and during the first reciprocation,
Pressurized air is ejected from the air ejection nozzle 46 to remove dust attached to the surface of the electrode rod 3, and during the subsequent reciprocating motion several times, antioxidant is ejected from the antioxidant ejection nozzle 44. Then, at '7Tf, an antioxidant is applied to the surface of the part to be inserted into the furnace body 2 next to the pole piece 3, and repeated coating is performed.

When the application of the antioxidant is completed, the nozzle mounting body 37.3
7 opens, the electrode rod 3 is unenclosed, and the multi-jointed arm 1
1 shrinks and the nozzle attachment body 37.37 separates from the electrode rod 3, and then approaches the next electrode rod 3, and the same operation as above is repeated, and the antioxidant is applied to the three electrode rods 3. When it is finished, the multi-jointed arm X1 is folded and the antioxidant jetting device 36 is retracted to the side of the electric furnace 1.

In this way, the work of applying the antioxidant to the electrode rod 3 can be performed while the electrode rod 3 is held by the gripping device 4, and when the application work is completed, the antioxidant spraying device 36
can be evacuated to the side of the electric furnace 1,
There is no risk that the antioxidant jetting nozzle 44 will be exposed to high temperatures for a long period of time.

Furthermore, in this embodiment, the antioxidant spraying device 36 surrounds the electrode rod 3 and can move up and down, so the antioxidant can be applied over the electrode rod 3 to a desired thickness. be able to.

Also, an antioxidant squirting device! 136 is the multi-jointed arm 11
Therefore, by simply preparing one multi-jointed arm 11, the antioxidant jetting device 36 can be freely adapted to each electrode rod 3.

In this embodiment, the servo motors 13, 15, 17 and 20 provided in the multi-joint arm 11 are each driven and controlled by a control device equipped with a learning and memory function, and the first manual operation is performed. Each servo motor with 13.15
．． By driving 17 and 20, the multi-joint arm 11
The amount of rocking of each arm 12.14 and 16m and the mounting body 19 when the antioxidant jetting device 36 is brought close to each electrode rod 3 by extending is stored in the control device, and from the second time onwards,
Each servo motor 13.15.17 based on its memorized value.
and 20 are drive-controlled, and the antioxidant jetting device 36 can be automatically brought close to each electrode rod 3.6 Furthermore, in this embodiment, an air jetting nozzle 46 is attached to the nozzle mounting body 37, 37. Therefore, dust on the surface of the electrode rod 3 can be removed before applying the antioxidant, and the antioxidant can be applied satisfactorily.

Further, in the above embodiment, the pair of nozzle mounting bodies 37, 37
The anti-oxidant jet nozzle 44 and the air jet nozzle 46, which were prepared separately, were attached to the nozzle mounting body 37. An antioxidant spouting port and an air spouting port may be provided respectively, and the antioxidant spouting device 3
Instead of the structure in which the multi-joint arm 11 is raised and lowered at the tip of the multi-joint arm 11, the multi-joint arm 11 itself may be raised and lowered along the support column 8.

As explained in detail, according to the present invention, the antioxidant can be applied while the electrode rod is being held by the gripping device, which eliminates the need to remove the electrode rod each time, significantly improving work efficiency. Furthermore, since the antioxidant spray nozzle can be retracted to the side of the electric furnace except when coating work is being performed, the nozzle will not be exposed to high temperatures for long periods of time, preventing the nozzle from becoming clogged. This has the effect that it is possible to prevent the nozzle from being damaged by heat, and to easily perform maintenance and inspection of the nozzle at any time if necessary.

[Brief explanation of drawings]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an enlarged front view showing details of the antioxidant jetting device and its drive mechanism, and Fig. 4 is an enlarged plan view thereof. It is a diagram.

Claims (1)

[Scope of Claims] 1. In an electric furnace in which an electrode rod, which is held and suspended by a gripping device that also carries electricity, is inserted into the furnace through a lid plate, an exposed portion between the gripping device and the lid plate of the electrode rod is inserted into the furnace through a lid plate. The antioxidant jetting device has antioxidant jetting nozzles mounted on corresponding surfaces of a pair of nozzle mounting bodies that approach the electrode rod from both sides to surround the electrode rod and release the surroundings by moving away from each other. Antioxidant coating device 2 for an electrode rod of an electric furnace, characterized in that it is provided so as to be retractable to the side of the electric furnace.The antioxidant spraying device surrounds the electrode rod and moves up and down to perform overcoating. An electrode rod antioxidant application device 3 for an electric furnace according to claim 1, wherein the antioxidant spraying device has a plurality of joints, and is attached to each joint. The electrode rod antioxidant coating device 4 for an electric furnace according to claim 1 or 2, characterized in that the device is attached to an arm that is driven by a servo motor and moves in a horizontal direction. An electrode rod antioxidant coating device 5 for an electric furnace according to claim 3, wherein the antioxidant coating device 5 is adapted to be controlled by a control device having a learning and memory function. An electrode rod oxidation method for an electric furnace according to claim 1, 2, 3, or 4, wherein an air jet nozzle is attached to corresponding surfaces of the pair of nozzle attachment bodies. Preventive agent applicator