JPH0518874Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electrode rod connecting device, and in particular to a device for quickly and easily adding a new electrode rod to an electrode rod held in an electrode rod holder of an electric furnace. Concerning what has been made possible.

[Conventional technology] Conventionally, when adding electrode rods in an electric furnace,
There were few satisfactory devices available, and the company relied solely on human power.

That is, as shown in FIG. 11, a new electrode rod 1 with a handle a for rotating operation attached thereto is suspended from a hanger 2 of a crane, carried onto the electrode rod 4 held by an electrode rod holder 3, and at least Two workers stand on the electrode rod holder 3 or the workbench 5, turn the handle a, and insert the taper screw 6 formed at the lower end of the new electrode rod 1 into the electrode rod 4 on the electrode rod holder 3 side. It was screwed into a female threaded portion 7 formed at the upper end of the holder.

[Problems that the invention aims to solve] However, the above work is hard labor and time-consuming, and it also has to be carried out at high places with a lot of dust and in a high-temperature atmosphere, which poses safety and health problems. Ta. Furthermore, since it relies on human power, the tightening torque during connection is insufficient, and there is a risk that the electrode rod may break.

The present invention was made to solve the problems of the conventional technology described above, and is an electrode rod connecting device that is easy to operate, allows for quick and reliable addition of electrode rods, and eliminates safety and health problems. The purpose is to provide

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an apparatus in which the lower end of a new electrode rod is screwed into the upper end of the electrode rod held in the electrode rod holder.
A sleeve that has an air chuck for inserting a new electrode and gripping the electrode, a main body that is rotatably provided on the outer periphery of the sleeve and has an air motor that rotates the sleeve, and a hanger that is suspended from a crane to remove the sleeve from the sleeve. A bolt with the same pitch as the screw of the electrode rod is screwed into the suspension frame provided at the upper end to allow the new electrode rod to be screwed in while suspending it, and a bolt is provided on the main body to align the axes of the electrode rods. It is characterized by having an alignment guide and a reaction force receiving means for taking the rotational reaction force of the main body from the electrode rod holder.

[Function] By supplying air, it is possible to quickly grasp a new electrode rod and quickly and reliably add it to the electrode rod on the electrode rod holder side with a predetermined torque.

In particular, it is screwed onto a hanging frame provided at the upper end of the sleeve from a hanger that is hung from a crane, and has bolts with the same pitch as the threads of the electrode rod that allow the new electrode rod to be screwed in while being suspended. , new electrode rods can be screwed in while the hanger remains suspended at a certain height, and no crane operation is required during screwing in. Further, since the electrode rods can be connected while the entire device including the new electrode rod is suspended, there is no risk of bending the electrode rod holder due to these loads.

[Example] An example of the present invention will be described below in detail based on the accompanying drawings.

1 to 4, reference numeral 3 denotes an electrode rod holder provided above the electric furnace, and this electrode rod holder 3 has a hole 8 through which the electrode rod 4 passes vertically, as shown in FIG. A gripping lever 9 is provided for removably gripping the electrode rod 4 between the electrode rod 4 and the inner wall of the hole 8. Electrode rod 4 held in electrode rod holder 3
An electrode rod connecting device 10 is used to screw and connect a new electrode rod 1 to the electrode rod 1.

The electrode rod connection device 10 has a cylindrical main body 1 that is suspended from a hanger 2 of a crane via a hanger 11.
3, and a sleeve 14 is inserted into the main body 13 in order to insert a new electrode rod 1 therethrough, and is rotatably supported via a thrust bearing 15. The upper end side of the sleeve 14 is cut out and opened as an introduction port 15, as shown in FIGS. 1 and 6, so that a new electrode rod 1 can be easily inserted. A pair of air chuck mounting windows 16 facing each other are formed at the lower end of the sleeve 14, and air chucks 17 for detachably holding the electrode rod 1 are formed in both air chuck mounting windows 16, as shown in FIGS. 3 and 4. A cover 18 is provided, into which the air chuck 17 is fitted so as to be movable in the radial direction, and which movably accommodates the air chuck 17. Air chuck 17
The chuck body 19 is mainly composed of a chuck body 19 and an air mat 20 interposed between the chuck body 19 and the cover 18. By injecting air into the air mat 20 and inflating it, the chuck body 19 is attached to the electrode rod 1. It is designed to be pressed against the side. A return spring 21 is attached between the chuck body 19 and the cover 18 so that the air chuck 17 expands in diameter and returns to its original state when air is removed from the air mat 20. An annular air supply pipe 22 surrounding the sleeve 14 is attached to the lower end of the sleeve 14, and the air supply pipe 22 is equipped with a quick coupler and an on-off valve for detachably connecting an air hose 23 from an air supply source. A base 24 is attached, and the air supply pipe 22 and the air mat 20 are communicated through a tube (not shown). Also,
A plurality of valves 25 are arranged in the air supply pipe 22 so that air can be vented from any direction.

In order to apply rotational force to the electrode rod 1 via the air chuck 17, a ring-shaped bevel gear 26 is attached to the sleeve 14, and a bevel gear 28 having a worm wheel 27 at the other end meshes with this bevel gear 26. A worm 30 attached to the rotating shaft of an air motor 29 attached to the main body 13 is engaged with the worm wheel 27 . air motor 29
A quick coupler for detachably connecting the air hose 23 and a pressure regulating valve 32 having a mouthpiece 31 with an on-off valve are connected to the air motor 29.
A pendant valve 33 for ON/OFF and forward/reverse switching operations is connected. Note that a pendant arm 35 for holding the tube 34 of the pendant valve 33 is attached to the main body 13 via a hinge 36.

In order to prevent the main body 13 from rotating due to the rotational reaction force of the sleeve 14, an engagement frame 44, which is a rotational reaction force receiving means 37 that engages the electrode rod holder 3 so as to sandwich the electrode rod holder 3, extends downward. It is provided. In addition, the engagement frame 44 is provided with a curved alignment guide that is applied to the side surface of the electrode rod 4 on the electrode rod holder 3 in order to align the axes of the new electrode rod 1 and the electrode rod 4 on the electrode rod holder 3. 3
8 is installed.

In addition, in order to suspend the electrode rod connecting device 10 while lowering it to follow the screwing of the electrode rod 1, an inverted U is pivotally supported at the upper end of the sleeve 14 by a pin 39.
A bolt 41 hanging from the hanger 11 and formed at the same pitch as the tapered screw 6 of the electrode rod 1 is screwed into the letter-shaped hanging frame 40 . Note that hanging wires 12 are provided at both left and right ends of the hanger 11 to connect it to the main body 13 as a safety measure in case the bolt 41 comes off. This hanging wire 1
2 is stretched relatively loosely to allow for the slight downward movement of the main body 13 as the electrode rod 1 is screwed in due to the rotation of the sleeve 14.

When adding electrodes using the electrode rod connecting device 10 constructed as described above, first, the main body 13 is supported on a stand 42 placed on the ground as shown in FIG. base 24
Connect the air hose 23 to. Next, a new electrode rod 1 is suspended from the hanging tool 2 of the crane via the swivel jig 43 and inserted into the sleeve 14.
While suspended in a predetermined position, the chuck is completed by opening the on-off valve of the base 24, closing the air chuck 17, and closing the on-off valve.

When the check is completed, remove the air hose 23 and jig 43, hook the crane's hanging tool 2 onto the hanger 11, move the main body 13 onto the electric furnace, connect the air hose 23 to the base 31 of the pressure regulating valve 32, and start the adjustment. The pressure valve 32 is set to a predetermined air pressure to generate a predetermined tightening torque.

Next, by lowering the main body 13 using a crane and engaging the engagement frame 44 with the electrode rod holder 3, the centering guide 38 is applied to the side surface of the electrode rod 4 on the electrode rod holder 3. ,4
Perform alignment. Next, pendant valve 3
When the air motor 29 is rotated by the valve operation in step 3, a new electrode rod 1 is rotated and connected to the electrode rod 4 on the electrode rod holder 3 by being screwed. Due to the rotational force applied to the new electrode rod 1, the hanging frame 40 simultaneously tightens the bolt 41 of the hanger 11.
The entire electrode rod connecting device 10 is connected to the electrode rod 1 by rotating the upper part.
This allows for downward movement at the same pitch as when screwing in, so no crane operation is required when screwing in.

When the connection is completed, the air motor 29 is stopped, the valve 25 of the air supply pipe 22 is opened, the air chuck 17 is opened, the air hose 23 is removed, and the main body 13 is moved to the ground using a crane.

In particular, since air is used as the driving source for gripping and rotating the electrode rod 1, the air from the electric furnace equipment can be used as is, unlike those that use electricity.
No special equipment required. Also air chuck 1
7 allows a new electrode rod 1 to be quickly grasped and rotated smoothly by the air motor 29, making it possible to carry out work safely and quickly, and also to eliminate health problems. By using air as a driving source, it is possible to obtain a large output with a small size, so that it is possible to reduce the size and weight of the device and reduce costs.

7 and 8 show a modified example in which a fastening belt 45 is combined with the centering guide 38.
According to this, the centering guide 38 and the fastening belt 45
By binding the electrode 4 on the electrode holder side with the fastening belt 4, the centering can be ensured.
5 binds the electrode rod 4 together with the centering guide 38 to constitute the rotational reaction force receiving means 37, so that the engagement frame 44 as in the previous embodiment is not necessary.

As shown in the figure, the main body 13 has an engagement frame 44.
Instead, an alignment guide 38 is attached via a mounting frame 46, cylinders 47 are attached to both sides of this alignment guide 38, and a tightening belt 45 is attached to the piston rod 48 of these cylinders 47 via a guide rod 49. The ends of each are connected. The centering guide 38 and the tightening belt 45 are made of narrow band-shaped members, and are designed to be wound around the outer periphery of the existing electrode rod 4.
Therefore, the frictional force when bound is small in the axial direction and large in the circumferential direction, effectively suppressing the rotational reaction force generated in the main body 13 as the electrode rod 1 is screwed in, and allowing the downward movement of the main body 13. I will do it.
The guide rod 49 is slidably inserted into guide sleeves 50 attached to both sides of the alignment guide 38.

FIGS. 9 and 10 show three bars 51 with the alignment guide 38 and rotational reaction force receiving means 37 upright, and a fitting frame 52 having three holes into which these are fitted.
This figure shows a modified example configured by the following. bar 5
1 are fixed to the upper opening periphery of the electrode rod holder 3 in an upright manner at intervals. Moreover, the tips of these bars 51 are tapered so that they can easily fit into the holes of the fitting frame 52, and
are set at different heights. Fitting frame 52
is formed in an annular shape so that the electrode rods 1 and 4 can be inserted therethrough, and is attached to the lower part of the main body 13 via a mounting frame 46.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) By supplying air, a new electrode can be quickly grasped and reliably attached to the electrode on the electrode holder side with the specified torque, eliminating the risk of the electrode breaking. Only one worker is required, and the work can be carried out safely and quickly even at high places, in dusty, high-temperature atmospheres, and there is little impact on health.

(2) In particular, the hanger that is suspended from the crane is screwed into the hanging frame provided at the upper end of the sleeve, and has bolts of the same pitch as the threads of the electrode rod that allow the new electrode rod to be screwed in while being suspended. This allows you to screw in a new electrode while keeping the hanger hanging at a certain height.
No crane operation is required during screwing. Furthermore, since the electrode rods can be connected while the entire device including the new electrode rod is suspended, there is no risk of bending the electrode rod holder due to these loads.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the electrode rod connecting device according to the present invention, FIG. 2 is a view taken along arrow A-A in FIG.
Figure 3 is a sectional view of the main parts of the device, Figure 4 is Figure 2B
-B sectional view, FIG. 5 is a perspective view showing how the electrode rod is inserted into the device, FIG. 6 is a perspective view showing how the electrode rod is connected by the device, and FIG. 7 is a modification of the present invention. A side view, FIG. 8 is an enlarged view in the direction of the arrow C-C in FIG. 7, FIG. 9 is a side view showing a further different modification, FIG. FIG. 3 is a perspective view showing a state in which electrode rods are connected. In the figure, 1 and 4 are electrode rods, 2 is a crane hanging tool,
3 is an electrode rod holder, 13 is a main body, 17 is an air chuck, 29 is an air motor, 37 is a rotational reaction force receiving means, and 38 is an alignment guide.

Claims (1)

[Claims for Utility Model Registration] (1) In a device that connects the lower end of a new electrode by screwing it into the upper end of the electrode held in the electrode holder of an electric furnace, A sleeve having an air chuck for gripping the electrode rod, a main body rotatably provided on the outer periphery of the sleeve and having an air motor for rotationally driving the sleeve, and a hanging frame provided at the upper end of the sleeve from a hanger suspended from a crane. The main body has bolts of the same pitch as the screws of the electrode rod that are screwed together and allows the new electrode rod to be screwed in while suspending it, and an alignment guide provided on the main body to align the axes of the electrode rods. and rotational reaction force receiving means for absorbing the rotational reaction force from the electrode rod holder. (2) The rotational reaction force receiving means includes a plurality of bars with tapered tips and different heights that are fixed upright on the periphery of the upper opening of the electrode rod holder, and are provided below the main body. The electrode rod connecting device according to claim 1, which is comprised of a fitting frame having a hole for fitting.