CN201540029U - Water-cooling furnace cover of electric furnace - Google Patents

Abstract

The utility model discloses a water-cooling furnace cover of an electric furnace, comprising a furnace cover body, a small furnace cover arranged at the upper end of the body, an electrode inserting hole arranged on the small furnace cover and a water-cooling pipe which is densely arranged at the lower part of the body; the water-cooling pipe, close to the small furnace cover, is also connected with a row of iron pieces which are arranged obliquely; one end of the iron piece is connected and fixed with the outer wall of the water-cooling pipe; the furnace cover plays a role of striking arc by the iron pieces, thus avoiding the water-cooling pipe close to the small furnace cover from being broken down by the arc and further causing water leakage; a plurality of sections of reinforcing ribs are welded discontinuously on the water-cooling pipe close to the small furnace cover so as to reduce the welding thermal stress and stress generated by different thermal expansions, thus reducing the probability of water leakage due to tearing of the water-cooling pipe; in addition, the distance of the water-cooling pipe closest to the small furnace cover and a steel structure of the small furnace cover is increased, thus leading the pipe to be far from an electrode as much as possible, and further reducing the probability that the pipe is broken down by the arc.

Description

The electric furnace water cooled cover

Technical field

The utility model relates to the large-tonnage electric furnace, more particularly, relates to a kind of electric furnace water cooled cover.

Background technology

At present, all large-tonnage (more than the 80 tons) electric furnaces in the whole world all adopt water cooled cover, see also Fig. 1～shown in Figure 3, water cooled cover 10 comprises bell body 11, be located at the port lid 12 of body 11 upper ends, be opened in electrode patchhole 13 on the port lid 12 and solid matter in the water cooling tube 14 of body 11 bottoms.But in actual production process, through regular meeting water cooling tube 14 drainages take place, cause electric furnace to be forced to stop to smelt, had a strong impact on production efficiency.By discovering that to cause the reason of leaking as follows:

One,, will puncture near the water cooling tube 14 of port lid 12 thereby cause high power electric arc, thereby produce drainage because electric furnace in the energising operation, can produce high-intensity magnetic field under the ultra high power three-phase alternating current electro ultrafiltration of electrode 1;

Two, in each stage that electric furnace is produced (as pyrolytic semlting, stop refining normal temperature), variations in temperature is bigger in the stove, and sequential welding is connected to reinforcement 15 (see figure 4)s on the water cooling tube 14 of the most close port lid 12, be easy to generate thermal stress, and in high-temperature smelting process, water cooling tube 14 is being subjected under the very high photothermy with reinforcement 15, water cooling tube 14 surface temperatures and reinforcement 15 temperature differ greatly, produce stress because of thermal expansion is different between water cooling tube 14 and the reinforcement 15 and concentrate, also cause water cooling tube 14 tube walls to tear and leak easily;

Three, mainly concentrate near port lid 12 water cooling tubes 14 according to bell 10 leakage areas and find that this water cooling tube 14 is less with the spacing a that port builds 12 steel constructions, is 100mm, so near spacing also is a reason that causes this water cooling tube 14 of arc through.

The utility model content

At the above-mentioned shortcoming that exists in the prior art, the purpose of this utility model provides a kind of electric furnace water cooled cover, and this bell can reduce the probability of happening of drainage, enhances productivity

For achieving the above object, the utility model adopts following technical scheme:

This electric furnace water cooled cover comprises the bell body, be located at the body upper end little bell, be opened in electrode patchhole that port covers and solid matter in the water cooling tube of body bottom, described near also being connected with the iron plate that a row is obliquely installed on the water cooling tube of little bell, iron plate one end and water cooling tube outer wall are connected to a fixed.

Intermittent weld is connected to several sections reinforcements on the water cooling tube of described the most close little bell.

The length of described every section reinforcement is 200mm, and the spacing of adjacent two sections reinforcements is 20mm.

The spacing of the water cooling tube of described the most close little bell and port lid steel construction is 150～200mm.

In technique scheme, this electric furnace water cooled cover of the present utility model comprises the bell body, be located at the body upper end little bell, be opened in electrode patchhole that port covers and solid matter in the water cooling tube of body bottom, near also being connected with the iron plate that a row is obliquely installed on the water cooling tube of little bell, iron plate one end and water cooling tube outer wall are connected to a fixed.This bell plays the striking effect by iron plate, avoids being caused leaking by arc through near the water cooling tube of little bell; By on the water cooling tube of the most close little bell, being interrupted several sections reinforcements of welding, in order to reduce sweating heat stress and to produce stress, the probability that leaks thereby the reduction water cooling tube is torn because of thermal expansion is different; In addition, the spacing of the water cooling tube by increasing the most close little bell and port lid steel construction also, thus make this pipe as much as possible away from electrode, thus also play this pipe of reduction by the probability of arc through.

Description of drawings

Fig. 1 is the structure cutaway view of the electric furnace water cooled cover of prior art;

Fig. 2 is the vertical view of the electric furnace water cooled cover of prior art;

Fig. 3 is the A portion enlarged diagram among Fig. 1;

Fig. 4 is the structural representation of water cooling tube of the close little bell of prior art;

Fig. 5 is the partial sectional view of electric furnace water cooled cover of the present utility model;

Fig. 6 is the structural representation of the water cooling tube of close little bell of the present utility model.

The specific embodiment

Further specify the technical solution of the utility model below in conjunction with drawings and Examples.

See also Fig. 1～shown in Figure 2, electric furnace water cooled cover of the present utility model 10 is basic identical with prior art, equally also comprise bell body 11, be located at body 11 upper ends port lid 12, be opened in three electrode patchholes 13 on the port lid 12 and solid matter in the water cooling tube 14 of body 11 bottoms.See also Fig. 5～shown in Figure 6, unlike the prior art be, on water cooling tube 14, also be connected with the iron plate 16 that a row is obliquely installed near port lid 12, iron plate 16 1 ends and water cooling tube 14 outer walls are fixing by welding, can play the striking effect by this iron plate 16, avoid being caused leaking by arc through near the water cooling tube 14 of port lid 12.And intermittent weld is connected to several sections reinforcements 15 on the water cooling tube 14 of the most close port lid 12, and the length b of every section reinforcement 15 is 200mm, and the spacing c of adjacent two sections reinforcements 15 is 20mm.By being interrupted the reinforcement 15 of welding, can reducing sweating heat stress and produce stress, the probability that leaks thereby reduction water cooling tube 14 is torn because of thermal expansion is different.In addition, the water cooling tube 14 of adjusting the most close port lid 12 and port cover the spacing a of 12 steel constructions, make it as much as possible away from electrode 1, and through repetition test, a is designed to 150～200mm with this spacing, so can further reduce this pipe by the probability of arc through.

Adopt electric furnace water cooled cover 10 of the present utility model, under the full production state, average every month bell number of times that leaks can be dropped to by present 5.23 times/month 0.77 time/month, and the probability that leaks has reduced by 85%, and effect is very remarkable.

Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of the above embodiment.

Claims (4)

1. electric furnace water cooled cover, this bell comprise the bell body, be located at the little bell of body upper end, be opened in electrode patchhole that port covers and solid matter in the water cooling tube of body bottom, it is characterized in that:

Described near also being connected with the iron plate that a row is obliquely installed on the water cooling tube of little bell, iron plate one end and water cooling tube outer wall are connected to a fixed.

2. electric furnace water cooled cover as claimed in claim 1 is characterized in that:

Intermittent weld is connected to several sections reinforcements on the water cooling tube of described the most close little bell.

3. electric furnace water cooled cover as claimed in claim 2 is characterized in that:

The length of described every section reinforcement is 200mm, and the spacing of adjacent two sections reinforcements is 20mm.

4. as each the described electric furnace water cooled cover in the claim 1～3, it is characterized in that:

The spacing of the water cooling tube of described the most close little bell and port lid steel construction is 150～200mm.

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