RU1827516C - Hold-down rings of contact unit of self-burning electrode - Google Patents

Abstract

Usage: the invention relates to ferrous metallurgy, and in particular to an attachment site for electrodes of ore reduction furnaces. The assembly is formed by combining the forks (inserts) of two half rings and securing them with a connecting element. It is proposed to cover the entire surface of the end insert and the surface of the holder partially adjacent to it with an insulating material with a thickness of 0.035-0.040 of the diameter of the holes for the connecting element. Embodiments of an alumina coating are also contemplated by spraying with a plasma jet or by applying asbestos on liquid glass. 2 s.p. f-ly. 1 ill.

Description

The invention relates to ferrous metallurgy, in particular to the design of contact assemblies of self-calcining electrodes of ore reduction furnaces.

The purpose of the invention is the electrical insulation of the casing of the pressure half rings of the contact assembly of the self-firing electrode.

Half-ring fittings, for example, steel round fingers, are calculated by the calculated clamping force, and therefore the diameter of the half-ring body bore for these fingers characterizes all the geometric parameters that can withstand the full load on the entire ring. The entire surface of the end insert is coated with a protective coating and

partly adjacent to the surface of the cage.

When the thickness of the layer of electrical insulation coating is less than 0.035 effective diameter of the hole for the connection element

with . 4 (j.oTB. ---. Where S is the section of the part, l Л

3.145) an electrical breakdown of the material can occur, with a material thickness of more than 0.040 L eff. the gap between the inserts and the plug of the elements unnecessarily increases, which leads to an increase in the height of the pressure ring, its weight and all equipment intended for bypassing the electrodes.

The drawing shows the device of the pressure half rings of the contact node of the self-firing electrode.

00

to

H

with cЈ

The pressure half rings with the end plug 1. containing the clips 2 are connected by elements 3. The entire surface of the end insert and the surfaces of the clips partially adjacent to it are coated with insulating material 4 with a thickness of 0.035 ... 0.040 of the hole diameter for the connection element. Example.

For the practical implementation of the device, a heat-resistant steel pressure ring is provided for a self-calcining electrode with a diameter of 1400 mm from the RKZ-21 furnace.

Estimated Dimensions: Axial Circular Diameter1960mm

Clamp inner diameter: 1400mm

Diameter of clips 2 outer 380 mm Diameter of clips 2 internal 215 mm Height of the left parts of the plug 173 mm Height of the right part 275 mm Outer width of the plug 373 mm Diameter of the hole for the connecting piece 3100 mm Thickness of the dielectric coating 4, rigidly connected to the surface, inserts equal to 100 -0.04 4 mm As an insulating material we used A120z powder deposited by a plasma jet on the surface of the end weld.

In operation, such an insulating layer showed itself reliably and worked without breakdowns during the year. However, applying a protective layer with a plasma jet to the bulky part of the pressure half rings,

It presents certain difficulties associated with their transportation and installation in front of the plasma torch. Therefore, an insulating coating of asbestos cloth on liquid glass was tested, which can be applied immediately before installing the half rings in the contact assembly. Both materials are suitable for use as an electrical insulating coating.

An advantage of the pressure ring of the invention is that. that during prolonged operation, even if there is a conductive dust between the mating parts of the half rings and the absence or breakage of the sleeve on the connecting part 3, the dielectric gap maintains a reliable barrier to eddy currents, which will increase the natural cosip installation by 2 ... 3%.

Feasibility study for the implementation of the proposed design of the clamping ring with a dielectric gap in the conditions of the workshop No. 4 of the Zaporizhia ferroalloy plant,

Claims (3)

1. The clamping half-rings of the contact unit of the self-firing electrode, containing clips with an end insert or plug, elements of their connection, characterized in that, for the purpose of insulating the clips, the entire surface of the end insert and the partially adjacent surface of the clip are coated with an insulating material with a thickness of 0.035 -0.040 hole diameters for the connection element, 2. Pressing semirings according to Claim 1. On the fact that the electrical insulating material is made of alumina deposited by a plasma jet. and 3. The pressure half rings according to Claim 1, which include the fact that the electrically insulating material is made of asbestos cloth on liquid glass. ffffiS-ff.ff & cfspp. ff / in.