JPH056799B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of an electrode joint device for an electric furnace using an electrode, and is a portable device that performs joint work using an existing crane. This was automated to improve the operability of the supporting mechanism.

[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. 8, the factory crane 2 that is normally installed for loading raw materials into the electric furnace 1, maintaining the electric furnace 1, etc. 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, a rail 5 is laid on a pair of left and right beams 4 near the ceiling of the factory, a crane girder 6 equipped with a traveling device is placed on this rail 5, and a traversing device is further installed on this crane girder 6. The support frame 10 of the electrode joint device 3 is suspended from a crane 2 which is equipped with a trolley 7 and a hook 9 suspended from a winding device installed on the trolley 7 via a cable 8. A joint electrode 13 is supported via a nipple 12 at the tip of a motor 11 that constitutes a rotation mechanism attached to a frame 10.

When adding the additional leg electrode 13 to the above-furnace electrode 1a of the electric furnace 1, the position of the crane girder 6 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 motor 11 is rotated 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. Then, add the additional leg electrode 13 by screwing it in.

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 cannot support the reaction force generated by the motor 11 when screwing in, and the additional leg electrode 13 may not be able to be screwed in, or the nipple 1 may be damaged after being added.
2 cannot be removed.

Therefore, by using the crane girder 6 of the factory crane 2, attaching the reaction force support member 14 to the support frame 10 of the electrode joint device 3 so as to project upward, and pressing this reaction force support member 14 against the crane girder 6. It supports rotational reaction force.

However, since the crane girder 6 is usually installed at a very high position near the ceiling of a factory, the reaction force support member 14 must be made very long, and the electrode joint device 3 becomes large. In addition, skill may be required to position the reaction force support member 14 on the crane girder 6 at a high position, and a convex reaction force receiver may be attached to the crane girder 6 to ensure the support of the reaction force. If concave grooves are formed in the support member 14 and these grooves fit together, positioning is more difficult and operability is poor. Furthermore, since the reaction force is supported far above the position of the motor 11 where the rotational reaction force is generated, there is a problem of poor stability.

[Problem that the invention seeks to solve]

This invention was made in view of the above-mentioned prior art, and is an electrode joint for an electric furnace that can automatically support the rotational reaction force of a portable electrode joint device using an existing crane with a simple operation. The purpose is to provide equipment.

[Means for solving problems]

In order to achieve this object, the electrode foot device for an electric furnace of the present invention includes a lifting mechanism for raising and lowering the foot electrode on a support frame suspended from a crane installed above the electric furnace, and a lifting mechanism for raising and lowering the foot electrode on a support frame suspended from a crane installed above the electric furnace. In a portable electrode joint device that is equipped with a rotating mechanism for screwing into the electrode, a reaction force support member is installed on a lifting arm that moves the lid of the electric furnace up and down, and an outrigger is attached to the lower end of the support frame. is retractably provided, and a pair of clamping members are provided which can be opened and closed to clamp the reaction force support member at the tip of the outrigger to support the reaction force of the rotation mechanism and to position the support frame at a predetermined position. The present invention is characterized in that an interlocking mechanism is provided for interlocking the opening/closing operation of the clamping member with the retracting operation of the outrigger.

[Effect]

The rotational reaction force of the portable electrode connecting foot device is transferred to a reaction force support member installed on a lifting arm located directly above the electric furnace, and a pair of outrigger tips retractably installed at the lower end of the support frame. Since it is supported by a clamping member that can be opened and closed, and the retracting operation of the outrigger is linked to the opening and closing operation of the clamping member, the operation for supporting the reaction force can be automated, improving operability. It is much better, the stability is improved, and the device itself can be made smaller.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, the electrode joint device 20 is suspended from a hook 9 of a factory crane. As shown in FIG. It is designed to be hung.

A support stand 22 is fixed to the middle part of the support frame 21, and the base ends of two lifting hydraulic cinders 23 forming a lifting mechanism are attached, and a slider 24 is attached to the tip of the cylinder rod 23a. It can be raised and lowered freely. A motor 25 for screwing in the electrode is attached to the upper end of the slider 24, and the rotating shaft of this motor 25 passes through the slider 24 and is guided downward, to which a nipple 27 is attached via a universal joint 26. A mounting plate 28 is connected thereto.

On the other hand, in order to support the reaction force accompanying the rotation of the motor 25 that constitutes the rotation mechanism, the support frame 21
A pair of brackets 29 are welded and fixed to each side of the lower end of the bracket 29, and the left and right side plates 30 are attached to the brackets 29, as shown in an enlarged plan view in FIG.
An outrigger 30 formed by a and upper and lower plates 30b at the tip is connected by a shaft 31 and is freely rotatable in the vertical direction.

In order to drive this outrigger 30, a bracket 32 is welded and fixed to the middle part of the support frame 21, as shown in an enlarged view in FIG. The tip clevis 33a is connected to a support pin 35 passing through a support metal fitting 34 fixed to the side plate 30a of the outrigger 30, and the outrigger 30 can be placed in a protruding state or in a retracted state.

At the tip of the outrigger 30, as shown in an exploded perspective view in FIG.
0b, and both clamping members 36 are connected through an oblong hole 36a with a connecting pin 38, and the upper and lower ends of this connecting pin 38 are rectangular so that the upper and lower plates 30b of the outrigger 30 extend along the longitudinal direction of the outrigger 30. It is attached to a guide groove 39 formed in the direction.

Further, a connecting member 40 for opening and closing the clamping member 36 is attached to the intermediate portion of the connecting pin 38, and is opened and closed by moving back and forth by a distance l.

Next, a fifth shaft is attached to the intermediate portion of the shaft 31 that supports the outrigger 30 as an interlocking mechanism that links the retracting operation of the outrigger 30 and the opening/closing operation of the clamping member 36.
An interlocking cam 41 as shown in the figure is rotatably provided, and a connecting rod 4 is connected to a connecting portion 41a that protrudes upward.
The proximal end clevises 42a of the two are connected, and the distal end clevis 42b is connected to the connecting member 40 on the side of the clamping member 36.
It is connected to. In addition, the connecting portion 4 of the interlocking cam 41
The protrusion 41b protrudes in a direction substantially perpendicular to 1a.
A tension spring 43 is connected to constantly urge the interlocking cam 41 clockwise. Then, just before the outrigger 30 becomes approximately horizontal (for example, about 10 to 15 degrees from the horizontal)
As shown in FIGS. 6a and 6b, the clamping member 36
In order to open the link cam 4 in this state,
A stopper 44 is installed on the side plate 30a of the outrigger 30 so as to restrict the clockwise rotation of the connecting portion 41a of No. 1, and a stopper 44 is installed on the side plate 30a of the outrigger 30 to restrict the clockwise rotation of the interlocking cam 41b. Board 45
is attached to the support frame 21.

Therefore, until just before the outrigger 30 becomes approximately horizontal, the interlocking cam 41 rotates together with the outrigger 30 by the tension spring 43 while abutting the stopper 44 and comes into contact with the backing plate 45.
From this state, as shown in FIG. 6a, the connecting portion 41a of the interlocking cam 41 and the connecting pin 38 on the side of the clamping member 36 are connected by the connecting rod 42, and the clamping member 36 has a radius around the connecting portion 41a. While rotating at R ₁ , the outrigger 30 rotates with a radius around the axis 31.
It will rotate with R ₂ . Therefore, the outrigger 30 rotates further, as shown in FIG. 7a,
In the horizontal state, the rotation of the interlocking cam 41 is restricted by the backing plate 45, and only the outrigger 30 rotates, so that the connecting pin 38 has a length l due to the difference between the radius R ₁ and the radius R ₂ described above. The holding member 36 is closed.

On the other hand, an outrigger 3 is mounted on a lifting arm 46 provided on the empty side of the electric furnace 1 to open and close the furnace lid 1b through which the furnace electrode 1a of the electric furnace 1 is inserted.
Reaction force support member 4 held by the holding member 36 at the tip
7 is installed.

The support frame 21 is provided with connectors for supplying working fluid, such as compressed air, pressure oil, or electric power, to the hydraulic cylinders 23 and 33 for elevating and evacuation drive, and the screw motor 25. A pendant switch is provided for control on the ground.

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

First, the electrode joint device 20 is suspended from the hook 9 of a factory crane via a wire or the like, and the crane is used to move it to a place where the joint electrode 13 is stored on a pallet or the like, and then the nipple 27 at the tip of the mounting plate 28 is attached. The additional leg electrode 13 is attached by rotating the motor 25.

Thereafter, the cylinder rod 23a of the lifting hydraulic cylinder 23 is extended and pressed against the support portion 22a fixed to the support base 22 so that the mounting plate 28 attached via the universal joint 26 does not shake.

Operate the crane to position the electrode 13 attached to the electrode connecting leg device 20 so that it is approximately coaxial with the furnace electrode 1a to be added, and position the electrode connecting leg device 20 so that the lower end surface of its support frame 21 is It is lowered to a position lower than the reaction force support member 47.

A working fluid is supplied to the retracting hydraulic cylinder 33 to rotate it downward from the retracted state shown by the two-dot chain line in FIG.

From this retracted state until the outrigger 30 is located directly above the reaction force support member 47 which is in a substantially horizontal state, the interlocking cam 41 is in contact with the stopper 44 by the tension spring 43, and the outrigger 30
As a result, the holding member 36 is in an open state.

When the outrigger 30 is further rotated from the position directly above the reaction force support member 47,
The interlocking cam 41 is regulated by the backing plate 45 and is in a fixed state, and only the outrigger 30 is rotated.
Due to the difference between the rotation radius R ₁ of the connecting pin 38 of the clamping member 36 and the rotation radius R ₂ of the outrigger 30 and the difference in center position, the clamping member 36 is closed and clamps the reaction force support member 47 .

By holding the support frame 21 with the holding members 36 in this manner, the support frame 21 is aligned and is in a state where it can support rotational reaction force.

In this state, the cylinder rod 23a of the lifting fluid pressure cylinder 23 is retracted to lower the slider 24, and the nipple 12a at the lower end of the additional leg electrode 13 is lowered.
When the electrode 1a is in a position facing the screw hole at the upper end of the furnace electrode 1a, the screwing motor 25 is driven, and screwing is performed while lowering the motor 25 together with the slider 24.

During this screwing, a reaction force due to rotation acts on the support frame 21, but the outrigger 3
The reaction force can be supported by the clamping member 36 at the zero tip and the reaction force support member 47.

When the screwing torque reaches a predetermined value, stop the screwing motor 25, change the clamp to the new electrode with the electrode holder 48 added, and while holding the new electrode, rotate the motor 25 in reverse to connect the nipple 27 and the added foot. The connection with the new electrode (new electrode) 13 is released to complete the addition.

When operating, the clamp position relative to the electrode holder is changed to adjust the electrode protrusion length.

When disconnecting the nipple 27 from the additional leg electrode 13, a large reaction force is generated as it requires several times as much force as when screwing the nipple. and the reaction force support member 47.

In order to put the outrigger 30 in the retracted state, the cylinder rod of the retracting hydraulic cylinder 33 is retracted. By this evacuation operation, the outrigger 3
0 is rotated upward, the clamping member 3
6 is opened, and when the outrigger 30 rotates to just above the reaction force support member 32, it is completely opened and enters the retracted state.

By retracting the outrigger 30 in this way, when you go to pick up the extension electrode 13 from where it is stored or when you move the extension electrode 13 to the top of the furnace with it attached to the electrode extension device 20, No interference with other factory equipment,
Easy to handle. In particular, in large electric furnaces, the distance between the lifting arms 46 is 4 m or more,
Although the outriggers 30 become a hindrance, this can be avoided.

In the above embodiment, the interlocking mechanism is composed of the interlocking cam 41, the connecting rod 42, etc., but the rotational position of the outrigger is not limited to this, and the rotational position of the outrigger is detected by a limit switch attached to the support frame, and the clamping is performed based on this detection signal. The clamping member may be opened and closed by reciprocating the connecting pin using a hydraulic cylinder instead of the connecting rod connected to the connecting member of the member. In addition, the clamping member is not limited to opening and closing by the reciprocating movement of the connecting pin, but it is also possible to attach a fluid pressure cylinder directly between the inner facing surfaces of the clamping member, and to open the rod by extending it and to close it by contracting it. It is possible. Further, the structure of the outrigger is not limited to that of the embodiment, and any structure may be used as long as it is arm-shaped.

〔Effect of the invention〕

As specifically explained above in conjunction with the embodiments, according to the present invention, in a portable electrode joint device that is used while being suspended from a crane, rotational reaction force can be retracted to the lower end of the support frame. The electrode is supported by the outrigger, the clamping member provided at the tip of the outrigger that is linked to the retracting movement of the outrigger, and the reaction force support member provided on the lifting arm located just above the electric furnace. When the connecting leg device is positioned almost directly above the electric furnace and the outrigger is extended, the clamping member is closed and automatically clamps the reaction force support member, so that the reaction force can be easily supported. I can do it.

Further, by closing the clamping member that was open to support the reaction force, the positioning of the electrode connecting leg device can be performed automatically.

Furthermore, when supporting the rotational reaction force by pressing it against the crane girder as in the past, the reaction force support member becomes very long. The device can also be moved up and down within the length of the reaction force support member rather than at a single point, making it easy to perform joint work.

In addition, if the outriggers are in a retracted state, there are almost no parts protruding from the support frame, and it is possible to avoid interfering with factory facilities when moving. There is no need to redirect the equipment to avoid interference, reducing the number of workers and making handling easier.

Furthermore, since the reaction force is supported at the lower end of the support frame, stability is improved.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the electrode joint device for an electric furnace according to the present invention, in which FIG. 1 is a front view of the whole, FIG.
Fig. 4 is an exploded perspective view of the clamping member, Fig. 5 is a perspective view of the interlocking mechanism, Figs. FIG. 8 is a partial plan view, and FIG. 8 is a front view of the conventional device. 1... Electric furnace, 1a... Furnace electrode, 1b... Furnace lid, 2... Factory crane, 9... Hook, 12a
... Nipple, 13 ... Electrode for joint leg, 20 ... Electrode joint device, 21 ... Support frame, 23 ... Fluid pressure cylinder for lifting and lowering, 25 ... Motor for screwing, 28 ... Mounting plate, 30 ...Outrigger, 3
3... Hydraulic cylinder for evacuation drive, 36... Clamping member, 38... Connection pin, 41... Interlocking cam, 4
2... Connection rod, 46... Lifting arm, 47
...Reaction force support member.

Claims (1)

[Claims] 1. A portable device equipped with a lifting mechanism for raising and lowering the extension electrode and a rotation mechanism for screwing the extension electrode into the furnace electrode on a support frame suspended from a crane installed above the electric furnace. In the electrode connecting foot device, a reaction force support member is attached to a lifting arm that moves the furnace lid of the electric furnace up and down, and an outrigger is retractably provided at the lower end of the support frame, and the tip of the outrigger is attached to the reaction force support member. A pair of clamping members that clamp the support member to support the reaction force of the rotation mechanism and position the support frame at a predetermined position are provided so as to be openable and closable, and the opening/closing operation of the clamping members is interlocked with the retracting operation of the outrigger. An electrode joint device for an electric furnace characterized by being equipped with a mechanism.