CN203011127U

CN203011127U - Clay tube for preventing lighting between big and small furnace covers of electric-arc furnace

Info

Publication number: CN203011127U
Application number: CN 201320009164
Authority: CN
Inventors: 孟怀军; 卢建钢
Original assignee: Wuyang Iron and Steel Co Ltd; Hebei Iron and Steel Group Co Ltd
Current assignee: Wuyang Iron and Steel Co Ltd; Hebei Iron and Steel Group Co Ltd
Priority date: 2013-01-09
Filing date: 2013-01-09
Publication date: 2013-06-19
Anticipated expiration: 2023-01-09

Abstract

The utility model relates to a clay tube for preventing lighting between big and small furnace covers of an electric-arc furnace, which belongs to the technical field of electric-arc furnace equipment, and is used for effectively preventing the fault that the furnace covers frequently leak water which is caused by electric lighting between the big and small furnace covers of the electric-arc furnace. The technical scheme is as follows: the clay tube comprises a plurality of single-section clay tubes, wherein each single-section clay tube is composed of a steel tube and fire clay, and the fire clay is filled in the steel tube; the steel tube is bent, and the bent curvature is the same with the curvature of the inner ring of the big furnace cover of the electric-arc furnace; a plurality of expansion joints of which the length is a semi-circle are arranged in the inner arc side of the steel tube in the radial direction of the steel tube; and the single-section clay tubes are welded at a gap between the big and small furnace covers of the electric-arc furnace, and the welding part is the tube wall of the inner ring water tube of the adjacent big furnace cover. The clay tube eliminates the fault that the furnace covers frequently leak water due to the electric lighting between the big and small furnace covers of the electric-arc furnace, and also plays a role of heat preservation to a certain degree. The clay tube has the advantages of simple structure, convenience in installation and good using effect, greatly reduces the maintenance workload and the labor strength, and improves the operating rate of the electric-arc furnace.

Description

A kind of mud pipe be used to preventing from striking sparks between the large small furnace cover of electric arc furnaces

Technical field

The utility model relates to a kind of mud pipe be used to preventing from causing occuring because of sparking between the large bell of electric arc furnaces and small furnace cover the furnace shell water leakage fault, belongs to the arc furnace equipment technical field.

Background technology

Electric arc furnaces generally adopts tubular type ring-type water cooled cover, and whole bell is comprised of the large bell of outer ring and the small furnace cover of inner ring, has three electrode holes in the middle of small furnace cover, and there are the gap afterwards between the two in it and large bell assembling.Under normal circumstances, bell is uncharged, but in actual production, can be owing to inevitably existing slag to conduct electricity between three-phase electrode and small furnace cover, the space that exists between so large small furnace cover just can cause the discharge sparking, thereby cause bell frequently to leak, leaking enters in the ladle of smelting, and can cause the stove implode when serious, must stop smelting, change, thereby cause very big impact to production.Therefore be very necessary the service life that effectively prevents electric spark phenomenon, the large small furnace cover of prolongation.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of mud pipe be used to preventing from striking sparks between the large small furnace cover of electric arc furnaces, and this mud pipe can effectively prevent from occuring between the large small furnace cover of electric arc furnaces the fault that the electricity sparking causes bell frequently to leak.

The technical scheme that solves the problems of the technologies described above is:

A kind of mud pipe be used to preventing from striking sparks between the large small furnace cover of electric arc furnaces, it comprises a plurality of single-unit mud pipes, each single-unit mud pipe is comprised of steel pipe and fire clay, fire clay is seated in steel pipe, tube bending, bending curvature is identical with the large bell inner ring of electric arc furnaces curvature, and the inner arc side of steel pipe radially has along steel pipe the expansion joint that multiple tracks length is semicircle, each single-unit mud pipe sequentially is placed on the gap location between the large small furnace cover of electric arc furnaces, is welded on adjacent large bell inner ring water pipe tube wall.

Above-mentioned mud pipe be used to preventing from striking sparks between the large small furnace cover of electric arc furnaces, the steel pipe length of its single-unit mud pipe is 250～350mm, and outer diameter of steel pipes is 70～80mm, wall thickness 10～15mm, between a plurality of single-unit mud pipes, the interval is arranged, the gap between adjacent single-unit mud pipe is 80～150mm.

Above-mentioned mud pipe be used to preventing from striking sparks between the large small furnace cover of electric arc furnaces, the expansion joint of steel pipe inner arc side is 4～6, and the width at every expansion joint is 5～8mm, and the distance of adjacent expansion seam is 40～50mm, and the expansion joint evenly distributes along the length direction of steel pipe.

The beneficial effects of the utility model are:

The utility model is welded on the gap location between the large small furnace cover of electric arc furnaces, has eliminated the fault that causes bell frequently to leak because the electricity sparking occurs between the large small furnace cover of electric arc furnaces, has also played to a certain extent heat insulation effect.The utility model is simple in structure, easy for installation, result of use is good, has greatly reduced maintenance load and labour intensity, has reduced the spare part loss, has improved the operating rate of electric arc furnaces.

Description of drawings

Fig. 1 is the structural representation of the utility model single-unit mud pipe.

In figure, mark is as follows: steel pipe 1, fire clay 2, expansion joint 3.

The specific embodiment

The utility model comprises a plurality of single-unit mud pipes, and each single-unit mud pipe is comprised of steel pipe 1 and fire clay 2.

Show in figure, steel pipe 1 length of single-unit mud pipe is 250～350mm, and steel pipe 1 external diameter is 70～80mm, wall thickness 10～15mm.Steel pipe 1 bending, bending curvature is identical with large bell inner ring curvature, and the gap location that steel pipe 1 should be between the large small furnace cover of electric arc furnaces is welded on adjacent large bell inner ring water pipe tube wall.Each single-unit mud pipe is arranged in order welding, and the gap between adjacent single-unit mud pipe is 80～150mm,

Show in figure, fire clay 2 is seated in steel pipe 1.The fire clay 2 in steel pipe 1 of packing into is used for preventing steel pipe 1 compressive deformation that is heated.

Show in figure, the inner arc side of steel pipe 1 radially has expansion joint 3 along steel pipe, and the effect at expansion joint 3 is to avoid mud pipe itself because of the large bell inner ring of the drawing crack of expanding with heat and contract with cold water pipe.The expansion joint 3 of each steel pipe 1 inner arc side is 4～6, and the width at every expansion joint 3 is 5～8mm, and the distance of adjacent expansion seam 3 is 40～50mm, and expansion joint 3 is uniform along the length direction of steel pipe 1.

The size of an embodiment of the present utility model is as follows:

Gap between adjacent single-unit mud pipe is 100mm;

Steel pipe 1 length of single-unit mud pipe is 250mm, and steel pipe 1 external diameter is 70mm, and wall thickness is 12mm.

Expansion joint 3 is 4, and the width at expansion joint 3 is 8mm, and the distance of adjacent expansion seam 3 is 50mm.

Claims

1. one kind is used for the mud pipe prevent from striking sparks between the large small furnace cover of electric arc furnaces, it is characterized in that: it comprises a plurality of single-unit mud pipes, each single-unit mud pipe is comprised of steel pipe (1) and fire clay (2), fire clay (2) is seated in steel pipe (1), steel pipe (1) bending, bending curvature is identical with the large bell inner ring of electric arc furnaces curvature, the inner arc side of steel pipe (1) radially has the expansion joint that multiple tracks length is semicircle (3) along steel pipe, a plurality of single-unit mud pipes sequentially are placed on the gap location between the large small furnace cover of electric arc furnaces, are welded on adjacent large bell inner ring water pipe tube wall.

2. the mud pipe be used to preventing from striking sparks between the large small furnace cover of electric arc furnaces according to claim 1, it is characterized in that: steel pipe (1) length of described single-unit mud pipe is 250～300mm, steel pipe (1) external diameter is 70～80mm, wall thickness 10～15mm, between a plurality of single-unit mud pipes, the interval is arranged, the gap between adjacent single-unit mud pipe is 80～150mm.

3. the mud pipe be used to preventing from striking sparks between the large small furnace cover of electric arc furnaces according to claim 1 and 2, it is characterized in that: the expansion joint (3) of described steel pipe (1) inner arc side is 4～6, the width at every expansion joint (3) is 5～8mm, the distance of adjacent expansion seam (3) is 40～50mm, and expansion joint (3) evenly distribute along the length direction of steel pipe (1).