JPH0747834Y2 - Electrode lift guide device in electric furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electrode elevating guide device in an electric furnace.

[Conventional technology]

The electric furnace is one in which the material to be melted charged in the furnace is melted by energizing the rod-shaped electrode inserted in the furnace, and the rod-shaped electrode is
It is provided so that it can be moved up and down in order to adjust the amount of insertion into the material to be melted and to replace the electrodes.

Explaining the structure for raising and lowering the electrodes in this electric furnace is as follows:
In the figure, 2 is a rod-shaped electrode vertically inserted into the electric furnace 1 by penetrating its furnace lid 1a, 3 is an electrode holding frame for holding the upper end of the electrode 2, and the electrode holding frame 3 is It is guided by a mast 4 standing upright outside the furnace and moved up and down by an electrode lifting mechanism 5. The electrode elevating mechanism 5 includes a screw shaft 6 provided vertically along the mast 4 and a motor 7 for rotationally driving the screw shaft 6. The screw shaft 6 is screwed to the electrode holding frame 3. The electrode holding frame 3 is inserted and inserted, and the electrode holding frame 3 is moved up and down by its rotation.

By the way, in such an electrode lifting structure, since the electrode holding frame 3 is lifted in a cantilever state,
The electrode holding frame 3
Must be supported by the mast 4 so as not to be tilted by the weight of the electrode 2.

Therefore, conventionally, as shown in FIG. 4 and FIG.
A frame pair 8 that uses the mast 4 as a prismatic mast and holds the outer periphery of the mast 4 at the base end of the electrode holding frame 3.
By providing rollers 9 and 9 on the inner circumference of the frame pair 8 for rolling contact with the front and rear of the mast 4 and the vehicle side surface, the mast 4 is held from all sides by these rollers 9 and 9, and the electrode holding frame 3 is held. By supporting the mast 4 so as not to tilt, the electrode 2 is guided so as to move up and down in a vertical state.

[Problems to be solved by the invention]

However, since the conventional electrode lift guide device as described above holds the mast 4 from the four sides by the rollers 9 and 9, the rollers 9 and 9 are axially supported on the frame pair 8 with an error accuracy of a millimeter unit. As a result, the assembling of the lifting guide device is very troublesome, and the rollers 9, 9 have a certain amount of "rattle", so that the electrode holding frame 3 has its own weight and the electrode 2 At least a rattling amount of the rollers 9 and 9 is inclined due to the weight, so that the electrode 2 is inclined to the vertical line. When the electrode 2 is tilted in this way, the electrode 2 is vertically moved in the tilted state, so that the electrode penetrating portion of the furnace lid 1a cannot be completely sealed.
External air may enter the furnace from the electrode penetration part of the furnace lid 1a to cause a chemical reaction of the melt A in the furnace, or gas in the furnace may leak from the electrode penetration part to the outside to cause pollution. was there.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electrode lifting guide device in an electric furnace which is easy to assemble and can surely prevent the electrode from tilting. Especially.

[Means for solving problems]

The present invention provides a vertical track rail with ball guide grooves along the length direction on the front side surface, both side surfaces, and the rear side surface on the side surface of the mast standing outside the furnace. At least two upper and lower bearing cases, each of which has a plurality of bearing balls rolling in respective ball guide grooves of the track rail, are slidably fitted to each of the bearing cases. The electrode holding frame is held by holding the upper end of the electrode holding mechanism and is raised and lowered by the electrode raising and lowering mechanism.

[Action]

That is, the electrode up-and-down guide device of the present invention is designed to guide the up-and-down movement of the electrode by a linear motion bearing consisting of a track rail and a bearing case fitted to the track rail and sliding along the track rail. In this electrode lift guide device, the track rail is provided on the side surface of the mast, and the electrode holding frame is supported by the bearing case fitted to the track rail, so that the structure is simple and therefore easily. It can be assembled, and the bearing case fitted to the track rail is
This bearing case slides along the track rail without rattling because it is connected to the track rail by a plurality of bearing balls that roll in the ball guide grooves on the front side surface, both side surfaces and the rear side surface of the track rail. Therefore, if at least two upper and lower bearing cases are fitted to the track rail and the electrode holding frames are supported by these bearing cases, the electrode holding frame will not be tilted by its own weight and the weight of the electrodes. By supporting, the inclination of the electrode can be surely prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. Incidentally, in the figure, those corresponding to those shown in FIGS. 5 and 6 are designated by the same reference numerals and the description thereof will be omitted.

In FIGS. 1 to 3, reference numeral 10 denotes two vertical track rails fixed to one side surface (side surface on the furnace 1 side) of the mast 4 standing vertically outside the furnace. As shown in FIG. 3, on the front side surface (side surface opposite to the mast 4) and both side surfaces, ball guide grooves 11 having a semicircular cross section along the length direction are provided over the entire rail length. . Reference numeral 12 denotes a bearing case fitted to the two track rails 10 and 10 and sliding along the track rails 10. The bearing case 12 is vertically arranged with respect to each track rail 10, 10. They are fitted one by one. As shown in FIG. 3, the bearing case 12 has a shape that holds the front side surface, both side surfaces, and the rear side surface of the track rail 10 and rolls in the ball guide grooves 11, 11 of the track rail 10. With the bearing balls 13, 13, the bearing balls 13, 13 are formed on the inner peripheral surface of the bearing case 12 so as to face the ball guide grooves 11, 11 of the track rail 10, respectively, and have a semicircular cross section. A plurality of rolls are held in the grooves 14 and 14, respectively. End plates (not shown) that prevent the bearing balls 13 from coming out are attached to the upper and lower surfaces of the bearing case 12, so that the bearing balls 13 roll in the ball holding groove 14 between the end plates. It has become. Further, the ball guide grooves 11 and 11 of the track rail 10 and the ball holding grooves 14 and 14 of the bearing case 12 are ultra-precision so that the bearing balls 13 roll without any looseness. It is processed.

The electrode holding frame 3 that holds the upper end of the electrode 2
Is fixedly supported on all of the bearing cases 12 and 12 fitted to the track rails 10 and 10 at the base end thereof, and the track rails 10 and 12 are mounted via the bearing cases 12 and 12.
It is guided by 10 and is moved up and down by the electrode lifting mechanism 5.

That is, the electrode elevating / lowering device guides the elevating / lowering of the electrode 2 by the linear motion bearing including the track rail 10 and the bearing case 12 fitted on the track rail 10 and sliding along the track rail 10. The bearing case 12 is connected to the track rail 10 by the bearing balls 13 and 13 so as not to be displaced in the width direction of the ball guide grooves 11 and 11, so that the bearing case 12 is formed on the track rail 10. The electrode holding frame 3 can be reliably guided by the track rail 10 because it slides along the track rail 10 without being separated from the track holding rail 3. And
This electrode lift guide device is equipped with a track rail on the side surface of the mast 4.
Since the electrode holding frame 3 is supported by the bearing case 12 fitted to the track rail 10, the structure is simple and therefore can be easily assembled. Further, the bearing case 12 fitted to the track rail 10 is raced by a plurality of bearing balls 13 and 13 rolling in the ball guide grooves 11 and 11 provided on the front side surface and both side surfaces and the rear side surface of the track rail 10. Since the bearing case 12 slides along the track rail 10 without rattling because it is coupled with the rail 10, at least two upper and lower bearing cases 12 are fitted to the track rail 10 and each bearing case 12 is fitted. If the electrode holding frame 3 is supported by the electrodes 12 and 12, the electrode holding frame 3 can be supported so as not to be tilted by its own weight and the weight of the electrode, and the tilting of the electrode 2 can be reliably prevented. Since it is possible to completely seal the electrode penetrating portion of 1a, it is possible to reliably prevent the occurrence of pollution due to invasion of external air into the furnace and gas leakage. Further, in the above-mentioned embodiment, two track rails 10 are provided on the mast 4, and each track rail 1
Bearing case 12,1 fitted with 2 pieces each for 0 and 10
Since the electrode holding frame 3 is supported by 2, the supporting strength of the electrode holding frame 3 is sufficient, and the lateral movement of the electrode holding frame 3 can be prevented.

In the above embodiment, the number of track rails 10 is two, but the number of track rails 10 may be arbitrary, and the number of bearing cases 12 fitted on one track rail 10 is three or more in the upper and lower directions. May be

[Effect of device]

The electrode lift guide device of the present invention can be easily assembled because of its simple structure, and the electrode holding frame is supported so as not to tilt due to its own weight and the weight of the electrode. Can be reliably prevented.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a side view of an electrode lifting guide device, and FIG. 2 is II of FIG.
-II is an enlarged sectional view taken along line II, and Fig. 3 is an enlarged sectional view of the track rail and the bearing case. FIG. 4 is a side view of a conventional electrode lift guide device, and FIG. 5 is an enlarged sectional view taken along the line VV of FIG. 1 ... Electric furnace, 2 ... Electrode, 3 ... Electrode holding frame,
4 ... Mast, 5 ... Electrode lifting mechanism, 10 ... Track rail, 11 ... Ball guide groove, 12 ... Bearing case, 13
...... Bearing ball, 14 …… Ball holding groove.

Claims (1)

[Scope of utility model registration request] 1. A vertical guide device for a rod-shaped electrode which is vertically inserted into an electric furnace. A ball is provided on the side surface of a mast standing outside the furnace, the front side surface, both side surfaces, and the rear side surface along the length direction thereof. A vertical track rail provided with a guide groove is provided, and at least two upper and lower bearing rails each having a shape holding the track rail and rolling in each ball guide groove of the track rail are provided on the track rail. In the electric furnace, an electrode holding frame is slidably fitted, and an electrode holding frame that holds the upper end of the electrode and is moved up and down by an electrode lifting mechanism is supported in each bearing case. Lifting guide device.