DE7116344U - CLAMPING DEVICE FOR THE ELECTRODES OF ELECTRIC MELTING FURNACES - Google Patents

Description

Clamping device for the electrodes of electrical

melting furnaces

The innovation concerns a clamping device for the Electrodes of electric melting furnaces "each consisting of a support ring surrounding the electrode" distributed over the! beginning of the support ring, ' Pressure jaws which are moveable in the radial direction and pivotably mounted on all sides, each of which is provided with a pretensioned pressure element and an awn Release of the pressure jaws against the pressure force of the pressure element acting by means of a cylinder-piston arrangement actuated by the pressure medium.

For each electrode there are two such, in vertically displaceable devices provided one above the other, which are alternately closed and be solved so that the electrode in a special way with the help of the adjustment and holding device in a vertical position Direction can be moved or held.

The space for those arranged above the melting furnace Clamping device is pretty cramped. Therefore, one endeavors in the construction of these devices to

Dem 1/71 Gm - ^ e / Ka - 2 - April 7, 1971

to use saving building units.

With ό & ΐΐ began- «" KleüHsvorrichtunÄen let the pressure element with the hydraulic cylinder piston arrangement and with the pressure jaw designed as a single unit. The piston is firmly connected to the pressure jaw with screws or similar. When the pressure jaw is placed on the electrode softens

in most cases - especially if the electrode jacket on self-baking electrodes is geometrical Has irregularities - the axial direction of the piston from the axial direction of the cylinder. away. the Conductive forces acting on the piston are absorbed on one side »by the piston sealing rings. The Piston Rings® are quickly worn out by one-sided loading, which then causes leakages in the hydraulic System arise.

The object of the innovation is to improve a clamping device in such a way that none of the clamping devices act laterally Executives get into the piston sealing rings of the cylinder-piston assembly.

This object is achieved according to the invention in that the piston of the cylinder-piston arrangement in the cylinder in which it is firmly connected to the pressure jaw Game is guided, with the help of a spherically rounded guide surface having guide ring is centered.

The summary of the working cylinder, the pressure organ

* · ■ · »··· r * one Ball joint storage permitted April ί 1971 •
• * · · ♦ · · · · the • · * · · fr «· one The I / 7I Gm C / Ka - 3 - 7. as well as the pressure jaw to a structural unit, as well as Savings

particularly short design.

De? * Guide ring takes over the puncture of a ball joint bearing and ensures that no side forces get into the sealing rings. This prevents that there are grooves in the cylinder or that the sealing ring takes over the guidance of the piston, which leads to a would lead to rapid wear of the sealing ring.

The innovation is explained in more detail with reference to the drawings. It shows:

Fig. 1 shows a new clamping device in Top view,

Fig. 2 shows a section on the line II-II gerafcfi Fig. 1,

3 shows a detail according to FIG. 2, shown on an enlarged scale.

As FIGS. 1 and 2 show, the electrode 1 is surrounded by a support ring 4. The ring 4 is designed as a box girder, on the side facing away from the electrode hydraulic cylinder-piston arrangements 5 * 6 are provided. The cylinder 5 with a small height is connected to a flange 20 which is fastened with screws 21 on the outside of the ring ^{l 4.} The working surface of the piston 6 is opposite the cylinder wall with a

The 1/71 Gm C / Ka

April 7th 1971

Sealing, if necessary, lip ring 9 (Pig · 3) made of rubber. The piston 6 is özw in the cylinder 5 with the help of a guide ring 8 made of bronze or a metal alloy. Plastic out, the cylinder ^ -anä touching surface is rounded convex. The guide ring 8 is fastened to the piston with screws 22. The piston 6 is vergröflert eil dished in its outwardly projecting over the cylinder 5 ^T. In the cylinder wall 5 is a channel 1? intended for the supply and discharge of the pressure medium, which is connected to an external pressure medium line. The side of the cylinder base 10 facing the electrode 1 serves as an abutment for a compression spring 3, which is supported at its other end on a spring plate 14 in the form of a krelaring. This spring shaft resting on a pressure jaw 2? 14 is guided on the inner wall of a pipe 16 fastened to the support ring 4 and on the outer wall of a pipe 15 firmly connected to the cylinder base 10. The screws 7 # which connect the bracket to the piston are outside the cylinder space. The screw shafts have sufficient play in the holes provided in the cinder block.

The pressure jaw 2 has a welded pressure plate 28, the curvature diameter of which is adapted to the electrode diameter.

The operation of the clamping device shown in Figures 1, 2 and 3 is as follows:

By the action of the compression spring 3, the pressure jaws 2 constantly radially and inwardly against the circumference of the electrode

The 1/71 Om C / Ka - 5 - 7 April x971

1 pressed. If the jaws 2 are to be released, pressure medium is introduced through the line 13 into the working chamber of the cylinder 5. The piston 6 moves outwards against the compressive force of the spring 3 and also has the jaw 2 connected to ± 1.λ , which is thereby lifted off the electrode 1. The stroke is practically approx. 8 mm and is limited by the jaw 2 striking the free end of the tube 16. The spherically rounded bore surface of the ring 8 enables slight deviations in the axial direction of the piston from the axial direction of the cylinder, which inevitably occurs when the pressure jaw 2 is moved or when the jaw is placed on the electrode 1. Due to the arrangement of the PUhrungringes 8, the same effect is achieved with simple means as when the pressure jaw is mounted on a ball socket

Claims (1)

Clamping device for the electrodes of electric melting furnaces, each consisting of a support ring surrounding the electrode, arranged distributed over the circumference of the support ring, movable in the radial direction and pivotably mounted on all sides, vo ^{4 of} which each is provided with a prestressed pressure element and one for Release of the pressure jaws against the pressure force of the pressure element acting «Druckralttel-actuated cylinder-piston arrangement, characterized in that that the piston (6) of the cylinder-piston arrangement (5 * 6) in the cylinder (5), which is firmly connected to the pressure jaw (2), in which it is guided with play, with the help of a ring (8 ) is centered.