SU396008A1 - DEVICE FOR PRESSING ELECTROCONTACT JAWS TO ELECTRO-ELECTRODE ELECTRODE - Google Patents

Description

one

The invention relates to the design, manufacture and operation of high-power electric furnaces, used, for example, for the production of ferroalloys and calcium carbide.

A device for clamping electrocontact cheeks is known, consisting of a water-cooled steel ring that encloses an electrode with contact cheeks pressed against it, and bellows pressure drums (bellows pressure boxes). The latter are placed in the water-cooled sockets of the ring and at one end abut against the contact cheek, and the other end against the lid covering the socket from the outside. If the pressure of the fluid is 25-30 kg / slg, it will tend to the length of the splice bush ULINNT1) SI along its axis AND with the STRENGTH

Normal 10 / pushes the cheek pin to the electrode. However, these devices have large dimensions and diameters “in the plan, including the space required to pull the sylphic box out of the deep socket in the radial direction when it is replaced. In addition, the need for a solid, durable 1-lid cover, which receives all the effort created by the bush, also increases the size of the gaber. To cool the lids, holes are made in them - water flows, which complicates and weakens their construction. The steel water-cooled ring itself with housings for axle G1 represents co6oii, usually a welded-cast structure with slalled internal butts, which, due to sharply uneven heating and cooling of its individual parts, is susceptible to cracking as well as burning from the side.

In the proposed device, each sylfoppus buckle is fastened with one end into the recess on the non-working vertical surface of the tactical cheek, and the other end through the electrolysis pad abuts against the wall of the pressure ring.

The reduction of the outer diameter for clamping the electrocontact cheeks is due to the fact that the axle boxes are recessed into the body of the contact cheeks, and the dimensions of the cross section of the pressure ring are reduced in diameter to a minimum.

Iostota configuration of the proposed pressure ring makes it cheaper to produce and improves the flow of water to it, which allows to increase the durability of the pressure ring and, consequently, the entire device as a whole. Since the radiation from the bottom of the device is not provided by the press ring, but with a second screen, the durability of the pressing ring is further increased. its weight is reduced, its ability to repair is improved, but compared to known pressures.1 and rings.

Pa figs. 1 shows the described device, top view; pas figs. 2 - the same, vertical section through one of the device sylfoppy boxes.

The device contains a pressure ring / box in cross section. It consists of two half-rings, interconnected, for example, with the help of mortgage fingers 2. The pressure ring is suspended from the supporting structures of the electrode holder with Monibio t g (in the drawing, not 1). Cooling water is withdrawn inside the half-ring.

Electric contact cheeks 3 abut on electrode 4. Between the pressure ring and each contact cheek is placed a hydraulic bellows box 5, a cylindrical bale 6 enclosed in B, protecting the bellows element of the bellows box from accidental damage.

Between themselves, the hydraulic bellows boxes are connected in series by means of detachable pipelines 7. They have electrically insulating inserts 8, for example, with a textolite sleeve, wrapped outside for teloizol cin asbestos. Each sylphon box is fitted with a stop 9. The contact cheeks each of each of two copper pipes 10 for supplying current, supplying and discharging cooling water. In the middle part of the contact cheek between the channels of water cooling, a recess 11 is made, the dimensions of which are sufficient to accommodate the bellows box with the protective casing. The recess extends upward from the middle of the cheek so much so that it is possible to move the bellows box until it is released from the pressure ring. The end of the axle box with the casing facing the cheek is connected with a brush, for example, a bolt 13.

The bush is electrically isolated from the ring, for example, with a micanite gasket 13. In addition, the pressure ring has vertical walls 14 and 15, a bottom 16 and a top sheet 17. At the locations of the stops 5, the vertical walls are interconnected by ribs 18 to ensure free passage of cooling water not reaching the bottom and top sheet. From the bottom, from the side of the furnace's throat, the pressure ring and part of the bellows boxes, which protrude from the recesses of the contact cheeks, are covered with a fpy64aTbiM water cooled screen 19, made of bottomless steel or copper pipes. The screen is suspended to the pressure ring, and the electrocontact cheeks to the - supporting structures of the electrode holder (not shown).

The pressure ring can be cast, welded or welded. FIG. 2 shows a welded version. In the process of operation of the device, a high-pressure liquid with a pressure of 20-40 / cgc / sg2 is supplied to the wygr |, bellows boxes and pumped through them, after which the cooling is directed to the heat exchanger, away from the electric furnace.

Thus, the high-pressure working fluid performs a double function: vonervyh, with its pressure the bellows box with a large force depresses the cheek 3 to the electrode 4, pushing away from the vertical wall 14 of the pressure ring; secondly, the constant sequence of fluid circulation through the bellows boxes and the heat exchanger-cooler prevents heat from the bellows boxes. By pressing or increasing the pressure, you can change the pressure of the contact cheeks. When the supply of liquid is stopped and the bellows joints are connected with the cheek drain, the electrode is released. Then you can unscrew the bolt 12 and, by unplugging the pipes 7, remove any bush 5.

It is also possible to remove the bush together with the cheek 3 by disconnecting the cheek suspension and the pipe 10. At the same time, the screen 19 must be removed, after which the cheek together with the bellows bush can easily be “dropped down.

When the pressure ring is replaced, the pressure of the bellows boxes is turned off, after which the claw fingers 2 are knocked out, the pressure ring is divided into two half-rings and demOUNTED.

As a high pressure fluid, water, water-oil on an emulsion, or some other non-flammable liquid may be used.

Subject invention

A device for clamping electrocontact cheeks to an electric furnace electrode, comprising a pressure ring covering an electrode with adjacent contact cheeks, hydraulic bellows boxes and a tubular water-cooled screen mounted on the underside of the pressure pin. characterized in that, in order to increase service life and reduce overall dimensions, each bellows box is fixed at one end in a recess on the non-working vertical surface of the contact cheek, and at the other end through the electrically insulating gasket rests against the wall of the pressure ring.

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