JPS647597Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to the improvement of an electrode connecting device for electric furnaces that uses consumable electrodes. The idea is to make the mechanism that supports the reaction force smaller and easier to transport.

[Conventional technology]

In electric furnaces such as arc furnaces, electrodes are essential, and graphite electrodes are generally used. This graphite electrode gradually wears out as operations are repeated, so it is common practice to add another electrode when it becomes short to a certain extent, which eliminates wasted electrodes and reduces steel manufacturing costs.

This type of electrode fitting work must be done in a high-temperature working environment on an electric furnace.Moreover, as electric furnaces become larger and more powerful, electrodes become larger, making it difficult to tighten them manually. However, since the tightening torque varies and it is easy to break, an electrode joint device is used.

For example, as shown in FIG. 3, a factory crane 2 that is normally installed for loading raw materials into the electric furnace 1 or for maintenance of the electric furnace 1 can be used as is.
There is a portable electrode joint device 3 that is suspended from the factory crane 2 and used.

That is, rails are laid on a pair of left and right beams near the ceiling of the factory, a pair of crane girders 5 equipped with traveling devices and connected at both ends by saddles 4 are placed on the rails, and a pair of cranes is placed on the rails. A crane 2 is equipped with a trolley 7 equipped with a traversing device on a rail 6 laid on a girder 5, and a hook 9 is suspended from a winding device installed on the trolley 7 via a cable 8. The support frame 10 of the connecting leg device 3 is suspended, and this support frame 10
Hydraulic motor 1 constituting the rotation mechanism attached to
1 through the nipple 12 at the tip of the leg electrode 13
I try to support.

When adding the additional foot electrode 13 to the above-furnace electrode 1a of the electric furnace 1, the position of the crane girder 5 of the crane 2 and the position of the trolley 7 are
A, 13 are positioned on the same axis, the hook 9 is lowered by the winding device, and the hydraulic motor 11 is turned on when the nipple 12a at the lower end of the extension electrode 13 faces the screw hole at the upper end of the furnace electrode 1a. Rotate and screw in the additional leg electrode 13 to perform the addition.

Such a portable electrode connecting device 3 can use an existing factory crane 2, so it is cheaper than installing a dedicated electrode connecting device. Since it is only lowered, it is unable to support the reaction force generated by the hydraulic motor 11 when screwing in, making it impossible to screw in the additional leg electrode 13, and making it impossible to remove the nipple 12 after adding more. .

Therefore, by using a pair of crane girders 5 connected by the saddles 4 of the factory crane 2, an arm corresponding to the length of the saddles 4, that is, the spacing between the crane girders 5 is attached to the upper end of the support frame 10 of the electrode joint device 3. 14 are fixed so as to protrude from both sides, and when the crane is hoisted, the hardware 15 attached to the upper surface of the tip of these arms 14 is pressed against the lower surface of the crane girder 5 to support rotational reaction force.

However, the crane 2 of the factory where the electric furnace 1 is installed is used for the purpose of transporting steelmaking materials, etc.
It is a large ton-class device, and the distance between the crane girders 6 is very wide, 4 m or more, and the arm 14 protrudes greatly from the support frame 10 of the electrode connecting leg device 2. For this reason, it is possible to support the rotational reaction force, but when transporting the electrodes for the connecting leg to the place where they are stored, it often interferes with factory facilities, and the arm of the electrode connecting leg device 3 is There are many problems in handling, such as the need for a different worker to avoid interference.

[Problem that the invention attempts to solve]

This idea was made in view of the above-mentioned conventional technology, and it is possible to miniaturize the mechanism that supports the rotational reaction force of the portable electrode joint device that uses an existing crane, and to make the electrode of the electric furnace easy to transport and handle. The purpose of this invention is to provide a supplementary foot device.

[Means for solving problems]

In order to achieve this purpose, this invention includes a lifting mechanism that raises and lowers the auxiliary leg electrode from a support frame that is suspended from a crane equipped with a crane girder that is installed above the electric furnace, and a lifting mechanism that moves the auxiliary leg electrode to the above-furnace electrode. In a portable electrode joint device equipped with a rotation mechanism for screwing, at least one telescoping arm is provided on both sides of the upper end of the support frame to correspond to the length of the saddle to which the crane girder is connected. The present invention is characterized in that a reaction force support metal fitting is attached to the upper surface of the tip of the telescoping arm to support the reaction force of the rotating mechanism by being pressed against the lower end surface of the crane girder by the hoisting force of the crane.

[Effect]

The rotational reaction force of the portable electrode joint device is applied to the reaction force support hardware on the top surface of the tip of the telescoping arm, which is extendable and retractable on both sides of the top end of the support frame, against the crane girder using the hoisting force of the crane. When transporting the electrode connecting leg device,
By retracting the telescopic arm, it prevents interference with factory facilities, etc. and makes handling easier.

〔Example〕

An embodiment of this invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 are a front view and a partially enlarged cross-sectional view of an embodiment of the electrode joint device for an electric furnace of this invention.

The electrode connecting leg device 20 is attached to the hook 9 of the factory crane 2.
It is of a portable type and is used by being hung from a wall, and is equipped with a support frame 21 formed of metal such as iron, and a hook 9 is hung on a receiver 22 at the upper end of the support frame 21.

At the lower end of this support frame 21 are two fluid pressure cylinders 23 for lifting and lowering the electrodes, which constitute a lifting mechanism.
The middle part of the cylinder rod 2 is installed.
A slider 24 is attached to the tip of 3a so that it can be moved up and down. A hydraulic motor 25 for screwing in electrodes constituting a rotation mechanism is attached to the upper end of the slider 24, and the rotation shaft of this hydraulic motor 25 is attached to a support 2 fixed to the support frame 21.
A mounting plate 29 is connected to the nipple 28 through a universal joint 27, and is connected to the nipple 28 via a universal joint 27.
3 is installed.

In addition, in order to support the reaction force caused by the rotation of the hydraulic motor 25 that constitutes the rotation mechanism, the upper end of the support frame 21 is provided with a
An outer cylinder 30 with a circular or square cross section protrudes slightly from both sides and is fixed horizontally by welding or the like, and a base end portion of a fluid pressure cylinder 31 that expands and contracts outward is installed inside this outer cylinder 30. . Further, at both ends of this outer cylinder 30, an inner cylinder 3 is provided which is extendable and retractable.
2 is inserted, and the cylinder rod 31a of the fluid pressure cylinder 31 is connected to form a telescoping arm that is driven to extend and contract.

Reaction force support hardware 33 with a pointed tip is attached to the upper surface of the tip of the inner cylinder 32 that constitutes each telescopic arm, and when each inner cylinder 32 is extended, these reaction force support hardware 33 can be used with a crane. It faces the lower end surface of the girder 5.

On the other hand, a reaction force receiver 34 is attached to the lower end surface of the crane girder 5. The reaction force receiver 34 has a groove in which the tip of the reaction force support metal fitting 33 engages.

The support frame 21 is equipped with hydraulic cylinders 23 and 31 for elevating and extending and retracting, as well as a hydraulic unit 35 for supplying hydraulic oil to the hydraulic motor 25, and a pendant for controlling these from the ground. A switch is provided. Alternatively, it may be directly supported by the crane girder without providing a reaction force receiver.

Electrode connecting work using the electrode connecting device 20 configured as described above is carried out in the following steps.

First, the receiver 22 of the support frame 21 of the electrode joint device 20 is hung on the hook 9 of the factory crane 2, and the device is suspended. In this case, the inner cylinder 32 of the telescoping arm is kept in a contracted state.

After this, the factory crane 2 is moved to a place where the extension electrodes 13 are stocked on a pallet or the like, and the extension electrodes 13 are attached to the nipples 28 of the attachment plate 29 of the electrode extension device 20 by rotating the hydraulic motor 25. Then, the attachment plate 29 and the extension electrodes 13 attached via the universal joint 27 are
To prevent the mounting plate 29 from shaking, hydraulic oil is supplied from the hydraulic unit 35 to the lifting fluid pressure cylinder 23 to extend the cylinder rod 23 a and raise the mounting plate 29 so that it is pressed against the lower end of the support 26 .

Next, the factory crane 2 is operated to position the supplementary leg electrode 13 so that it is almost coaxial with the furnace electrode 1a to be supplemented, and the electrode supplementary leg device 20 is lowered to a certain extent to extend the inner cylinder 32 of the telescoping arm. Hydraulic oil is supplied to the hydraulic cylinder 31 for expansion and contraction.

Then, the hook 9 of the factory crane 2 is hoisted up to engage the reaction force support metal fitting 33 on the upper surface of the tip of the inner cylinder 32 with the reaction force receiver 34 of the crane girder 5, and a predetermined force is applied.

In this state, while retracting the cylinder rod 23a of the hydraulic cylinder 23 for lifting and lowering, the slider 24
Lower the nipple 1 at the lower end of the additional leg electrode 13.
When the electrode 2a is at a position facing the screw hole at the upper end of the furnace electrode 1'a, the hydraulic motor 25 for screwing is driven, and screwing is performed while lowering the hydraulic motor 25.

In this case, the generated rotational reaction force is caused by the reaction force support hardware 33 of the inner cylinder 32 and the reaction force receiver 3 of the crane girder 5.
4 and supported by

When the screwing torque reaches a predetermined value, stop the hydraulic motor 25, change the clamp to a new electrode with the added electrode holder, and while holding the new electrode, rotate the hydraulic motor 25 in reverse to tighten the nipple 2.
8 and the additional leg electrode 13 are released. When operating, the protruding length of the electrode relative to the electrode holder is adjusted.

When disconnecting the nipple 28 and the connecting leg electrode 13, a rotational reaction force several times as large as when screwing is generated, but this is also caused by the reaction force between the reaction support metal fitting 33 of the inner cylinder 32 and the crane girder 5. It can be supported by a force receiver 34.

After the connecting leg work is completed in this manner, the electrode connecting leg device 20 is lowered to disengage the reaction force support hardware 33 and the reaction force receiver 34, and the above-mentioned procedure is repeated with the flesh tube 32 in a contracted state.

In addition, in the above embodiment, the elevating mechanism, the rotating mechanism,
Although the expansion and contraction mechanism is hydraulically operated, it may also be pneumatically operated or electrically operated. Further, the telescopic mechanism is not limited to a cylinder and a cylinder rod, but it is also possible to use a general telescopic mechanism such as a pinion and a rack. Furthermore, although the reaction force needs to be supported at at least two points, it is also possible to support it at more points.

[Effect of idea]

As specifically explained above in conjunction with the embodiments, according to this invention, the rotational reaction force of a portable electrode connecting leg device used by being suspended from a crane can be absorbed by an extendable Since the telescopic arm is supported by the reaction force supporting hardware on the upper surface of the tip and the lower end surface of the crane girder, the outrigger can be in a retracted state when there is no need to support the reaction force. This makes it easier to transport the electrode extension device, and it does not interfere with factory facilities when going to pick up the electrode extension, eliminating the need for workers to transfer to avoid interference, which was required in the past, and making handling easier. It becomes easier. This is particularly effective when the distance between crane girders in a factory where a large electric furnace is installed is wide.

[Brief explanation of the drawing]

1 and 2 are a front view and a partially enlarged sectional view of an embodiment of the electrode joint device for an electric furnace of this invention, and FIG. 3 is a front view of a conventional device. 1...Electric furnace, 1a...Furnace electrode, 2...Factory crane, 9...Hook, 12a...Nipple,
13... Electrode for extra leg, 20... Electrode extra leg device, 2
DESCRIPTION OF SYMBOLS 1...Support frame, 23...Fluid pressure cylinder for lifting/lowering, 25...Hydraulic motor for screwing, 29...
...Mounting plate, 30...Outer cylinder, 31...Fluid pressure cylinder for expansion and contraction, 32...Inner cylinder, 33...Reaction force support hardware, 34...Reaction force receiver, 35...Hydraulic unit.

Claims (1)

[Scope of utility model registration request] A lifting mechanism for raising and lowering the extension electrode and a rotation mechanism for screwing the extension electrode into the furnace electrode were attached to a support frame suspended from a crane equipped with a crane girder installed above the electric furnace. In a portable electrode joint device, at least one telescoping arm is provided on both sides of the upper end of the support frame to correspond to the length of the saddle to which the crane girder is connected, and the hoisting arm of the crane is mounted on the top surface of the tip of these telescoping arms. 1. An electrode joint device for an electric furnace, characterized in that a reaction force support metal fitting is attached which is pressed against the lower end surface of a crane girder by force to support the reaction force of the rotating mechanism.