US1532599A - Electric furnace - Google Patents

Description

April 7, 1925. 1,532,599

W. E. MOORE ELECTRIC FURNACE Original Filed Spt.5 1919 6410: neg

Patented 7, i225.

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CQRPORATIQN, A CORPORATION OF DELAWARE.

' (Mginalanpllcatflon filed September 5? 1919, serial Ki o. 321,851. Divided and this application filled september 12, 1921.

To all whom it may concern:

Be it known thatl, WILLIAM E. Moons, a citizen of the United States of America, residing at Beaver, inthe county of Beaver and State of Pennsylvania, have invented certain new and useful Improvements in Electric Furnaces, of which the following is a specification.

l/fy invention relates to electric furnaces of the arc type, and more particularly to mechanism for raising and lowering the arc ing electrodes. I

It has heretofore been proposed to employ hoisting cables and motor driven winding drums for this purpose, the motors being controlled by automatic regulators, and the ends of the cables being attached to the winding drums. Difficulty has, been experienced with such apparatus, however, owing to the fact that, should the automatic regulators fail, for any reason, to stop the motors at the proper time, the drums continue to turn, thus causing overwinding of the cables and resulting in serious damage.

The primary object of the present invention is, therefore, to provide an improved hoisting mechanism of the above type, whereby the movement of the electrodes is automatically restricted to definite limits, regardless of whether the motor stops or not. In other words, I propose to render the rotation of the drums inefiective to move the electrodes beyonda certain point, and to this end I contemplate the provision of means to operatively disconnect; the cables from their respective winding drums when the predetermined limit of travel has been reached in either direction. 7

' For operatin the. electrode arms of furnaces of the tiltlng type when adjusting the arcs as the carbon electrodes wearaway, it has heretofore been customary to mount motor winches directly on the furnace shell,

engaging racks connected to the electrode arms; or in some cases the motors are geared to vertical screws, which engage the electrode arms. This results in a great deal of complication in and around the furnace shell, which is especially objectionable, on

account of the heat, dust and dirt incident to the operation of the electric furnace, thus producing many burn-outs in the motors and great wear and tear on the gears. Moreover, due to'.the tilting action of the erlal No. 500,137.

furnace, the motor when attached to and tilting with the furnace tends to spill the oil out of its hearings and injure its Windings and run its hearings hot.

' It has also been heretofore proposedto -dispose the motor winches in a pit or the like, below the furnace, but it has been found'that under these conditions they are subject torapid wear and tear, due to the accumulation of ash, slag, etc., and they are especiall liable to. injury when the furnace bottom cuts through and pours itsv contents of molten metal on and around the motors.

A further object of my invention there? fore, is to overcome all these dificulties, and to this end I provide novel means for operat\ ing the electrode arms, in which the winches or winding drums are mounted in the sub station wall, where they are protected from the dust and dirt, but are made readily accessible.

This application is a division of application Serial No. 321,851, filed September 5, 1919; Patent No. 1,444,980 of February 13, 1923.

- One embodiment of my invention is illust-rated in the accompanying drawings, forming a part of this specification, and in which,

Figure 1 is a front view of the furnace and the connections therefor, and

Figure. 2 is'a sectional plan of the winding mechanism, the section being on the line 22 of Figure '1.

In carrylng out my invention I provide a suitable'base 1, upon which are mounted horizontal supports 2 and 3 for rockers or trunnion frames 4 and 5 res ectively. The 1 trumiions are mounted at t e sides of the furnace body or crucible so as to permit the furnace to tilt forwardly and backwardly. The means for tilting the furnace consists of a hand wheel 6, connected with suitable operating mechanism, as clearly shown in the above mentioned application,

and supported on the floor column 9. The

tilting means, it will be noted, is Well above the floor, making ready inspection and repair convenient, and being free from all troubles due to dust, dirt, slag, molten 'metal, etc. The tilting mechanism may be actuated by a motor 13, if desired.

Electrode arm-supportin columns 14 are carried by the trunnion rame 5 and theelectrode arms 15 are movable along the columns to. adjust the arcs. For this purpose, l mount motor winches 16 inside the sub-station wall 17, where they-are protected from heat, dust and dirt by the sub-station 18 and also by the removable screen or cover 19. The motor winches 16 are connected with the arms 15 by cables 20 which pass underneath the floor '21 around the sheave wheels 22, thence upwardly through the columns 1 to suitable sheaves 23, down around the sheaves 2dand are fastened to the sheave brackets 25. This greatly simplifies the furnace structure and reduces the troubles, delays and costs of the ordinary structure.

As it is sometimes desirable to hoist the electrode arms when no power is available for operating the electrode winches, I also rovide a hand crank gear 26, connected y sprockets 27 and chain 27 to the winches. This has a crank shaft placed at convenient height and the chain 27 is made adjustably,

taut by eccentric hand crank shaft bearing 28 clamped in housing 29, attached to lintel beams 30, built into the opening of the substation wall. The cranks 31, when swung backward, disengage the flattened head on the end of the sprocket shaft 27", so that the shaft may then revolve freely when turrlijezd by the motor without revolving the era K The electrode arms are carried on turned pipe columns 14: by means of sleeve-like cross heads 36, guided by anti-friction rollers 37. These sleeves are held in their correct vertical plane by means of feathers 38, attached to the columns, which are engaged by suitable feather ways, not shown, in the cross heads 36.

The bufler spring 96 is arranged to engage 'a pad. or projection 97 attached to the roof frames 80, so that the top of the electrode arm is caught by the spring, and the clamp endof the arm prevented from coming in contact with the electrode gland, irrespective of the height of the roof or the extension of the same, due to heat.

Myimproved means by which the electrode arms are raised or lowered will be now described. A drum 99 isprovided for each cable 20, only one drum beingshown.

The cables 20, as stated before, pass underneath the floor 21, through a tunnel 39 for each' cable. The cable is wrapped several times around the drum to obtain a friction bite and is passed over a pulley.

100, and supports a counterbalance weight '101. When the. electrode'arm has reached its uppermost limit of safe travel, the weight 101 will rest on the floor so that the cable 20;. will be slackened and will lose its bite, thereb allowing the drum to revolve freely inside the coils of the cable anteater without straining or breaking the hoisting mechanism. In like manner, when the spring 96 engages the buttress 97, the cable is slackened, allowing the drum to revolve harmlessly.

ll claim:

1. The combination with a tilting electric furnace of mechanism for adjusting electrodes in said furnace, said mechanism comprising motors mounted on a stationary support, drums operated by said motors and operating-cables passing from the electrodes to and around said drums and carrying at their ends weights adapted to maintain them in frictional engagement with said drums.

2. An electric furnace having adjustable electrodes, motors, drums operated thereby, automatic regulators for said motors and cables for operating said electrodes, said cables passing to and around said drums, and weights on the ends of said cables adapted to maintain them in frictional engagement with said drums.

3. An electric furnace having adjustable electrodes, motors, drums operated thereby, automatic regulators for said motors and cables for operating said electrodes, said cables passing to and around said drums, weights on the ends of said cables adapted to maintain them in frictional engagement with said drums, and supports for said weights limiting the extent of movement of the cable through which the drum will frictionally engage it to lift the electrode.

4. The combination with an electric furnace having an adjustable electrode, of. mechanism for adjusting said electrode comprising a motor mounted on a stationary support, a drum driven by said motor,

and an operating cable passing from said electrode to and around said drum, and carrying at its end a weight adapted to maintain the cable in frictional engagement with said drum. 7

5. The combination-with an electric furnace having an adjustable electrode, of mechanism for adjusting said electrode comprising a motor mounted on a stationary support, a drum driven by said motor, and an operating cable passing from said electrode to and around said drum, and supporting a weight at a point beyond said drum, said weight serving to cause the drum to frictionally drive the cable.

6. The combination with an electric furnace having an adjustable electrode, of mechanism for adjusting said electrode comprising a motor mounted on a stationarysupport, a drum driven by said motor, an operating cable passing from said electrode to and around said drum, a weight su ported by said cable at a point beyond t e drum, said weight serving to cause the cable to .be frictionally driven by the'drum, and

means for arresting the downward travel of IOU aeeaeee said weight at a predetermined point, and thus limiting the extent of movement of the cable through which it will be frictionally driven by the drum to lift the electrode.

7. The combination with an electric furnace having an adjustable arcing electrode, of power means for adjusting said electrode, and mechanical means, independent of the furnace structure, for preventing the over-running of the electrode.

8. In an electric furnace of the tilting type, a support, electrode carrying arms slidable on said support, cables for raising and lowering the electrode supporting arms, means for operating the cables, and means for preventing the over-running of the electrode arms.

9. In 'anelectric furnace of the tilting type, a support, electrode carrying arms slidable on said support, cables for raising and lowering the electrode supporting arms, means for operating the cables, and automatic means for preventing the over-running of the-electrode arms.

-10. Thecombination with an electric furnace having an adjustable arcing electrode, of means for adjusting said electrode comprising a winding drum, a cable connected to said electrode and coiled around the drum, and a counter-balance weight carried by the cable on the other side of the drum.

11. The combination with an electric furnace having an adjustable arcing electrode, of means for adjusting said electrode comprising a winding drum, a cable connected to said electrode and extending to the drum, means for normally causing the cable to exert a frictional driving grip on the drum, and means for automatically releasing such grip when the electrode reaches the limit of its movement.

12. The combination with an electric furnace having an adjustable arcing electrode, of means for adjusting said electrode comprising a winding drum, a cable connected to said electrode and extending to the drum, means for normally causing the cable to exert a frictional driving ip on the drum, and means for automatica 1y releasing such grip when the electrode reaches the upper or lower limit of its movement.

13. In an electric furnace, aguide column, a pulley carried thereby, an electrode'arm arranged to travel on said column, a winding drum, a cable connected with the arm and passing over said pulley, said cable being ing to the drum, and means for causing the cable to exert a grip on the drum which grip is released automatically when the electrode arm has reached a limit of its movement.

15. In an electric furnace, aguide column, a pulley carried thereby, an electrode arm, a winding drum, a cable connected with the arm and passing over the pulley and extending to the drum, and means for causing thecable to exert a grip on the drum which is released automatically when the electrode arm has reached the upper or lower limit of its movement. v

16. In an electric furnace, an electrode arm, a guide column, said arm being slidably mounted on said guide column, an electrode winch'spaced from the furnace structure, and a cable secured to the electrbde arm at one end and arranged to pass underneath the floor and connected to said winch.

17 The combination with an electric furnace having an arcing electrode, and a transformer for supplying current thereto, of a' transformer house adjacent the furnace, a motor driven winch mounted within the Wall of the transformer house, and a cable supporting said electrode and operatively connected with said winch.

18. Thecombination with an electric furnace having an arcing electrode, and a transformer for supplying current thereto, of a motor driven winch, a protective housing in which said motor driven winch is enclosed, and a cable supporting said electrode and operatively connected with said winch. I

19. The combination with an electric furnace of the tilting type having an arcing electrode, of a cable by which said electrode is suspended in the furnace, means for tilting the furnace, and means for raising and lowering said electrode comprising a winding drum to which said cable is operatively connected, said winding drum bein mounted on a fixed support to one side .0 and substantially on thesame level as the furnace.

In testimony whereof I aflix my signature.

WM. E. MOORE.

DISCLAIM ER 1,532,599.W2'lliam E. Moore, Beaver, Pa. ELECTRIC FURNACE. Patent (ISM/ed April 7, 1925. Disclaimer filed January 14, 1939, by the assignee, Pittsburgh Research Corporation. Hereby enters this disclaimer to claim 19 of said patent.

v [Ofiicial Gazette February 14, 1989.]

DISCLAIM ER 1,532,599.William E. Moore, Beaver, Pa. ELECTRIC FURNACE. Patent dated April 7, 1925. Disclaimer filed January 14, 1939, by the assignee, Pittsburgh Research Corporation. Hereby enters this disclaimer to Claim 19 of said patent.

v [Ofiieial Gazette February 14, 1939.]

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