CN201033790Y - Oxygen lance nozzle without welding - Google Patents

Abstract

The utility model relates to an oxygen lance spray head without welding. The structure of the oxygen lance spray head is reasonable, and the spray head can be replaced without leaving the steelmaking workshop. It is composed of a ring and an O-shaped rubber ring. It is characterized in that the copper nozzle and the outer tube of the oxygen lance are connected by threads and sealed by a high-temperature-resistant sealing ring; the copper nozzle and the inner layer of the nozzle are connected by threads and passed through O-shaped rubber ring for sealing. The beneficial effects of the utility model are: canceling the welding process of the copper nozzle and the outer and inner layer nozzles, saving energy and reducing costs; replacing the nozzle of the oxygen lance without cutting and welding, and without transporting the oxygen lance back to the maintenance workshop , the nozzle can be replaced only next to the steelmaking furnace. It greatly simplifies the production process, shortens the time for changing guns, reduces the labor intensity of workers, improves production efficiency, and increases steel output.

Description

Oxygen lance nozzle without welding

technical field

The utility model relates to an oxygen lance nozzle used in converter and electric furnace steelmaking.

Background technique

Oxygen lance is the key equipment for oxygen steelmaking. The nozzle on the oxygen lance is a consumable part. Its service life is as short as dozens of furnaces, and as long as hundreds of furnaces. Most of them have a service life of about 200 furnaces. If the nozzle of the oxygen lance is damaged, it must be replaced. To replace the oxygen lance nozzle, it is to cut the old oxygen lance nozzle from the oxygen lance body, and then weld the new nozzle on the oxygen lance body. From the day when the steelmaking oxygen lance was born, the replacement of the steelmaking oxygen lance nozzles in all countries in the world is carried out in this way.

Fig. 1 is an assembly diagram of an oxygen lance and a spray head in the prior art. Copper nozzle 1, nozzle outer layer connection 2, nozzle inner layer connection 4 and 3 "O" shaped rubber sealing rings 5 constitute the nozzle spare parts, middle sliding tube 3, inner sealing tube 6, outer tube 7, middle tube 8 and The inner tube 9 forms the lower part of the oxygen lance gun body.

Since the welding of red copper and steel pipe belongs to the welding of dissimilar metals, the requirements for welding technology are relatively high. When the copper nozzle 1 is welded with the nozzle outer nozzle 2 and the nozzle inner nozzle 4, the welding should be heated to about 800°C, and then argon arc welding is performed. In order to ensure the welding quality and ensure the safe use of the oxygen lance, the welding seam between the copper nozzle 1, the nozzle outer nozzle 2 and the nozzle inner nozzle 4 needs to be inspected by X-ray flaw detection. Therefore, the welding of nozzle spare parts must be carried out in the nozzle spare parts production plant, and copper-steel welding cannot be performed in the oxygen lance maintenance workshop of the steelmaking plant.

The assembly process of the nozzle spare parts and the oxygen lance body is as follows: insert the nozzle spare parts into the oxygen lance body, that is, insert the nozzle inner layer connection tube 4 into the inner layer sealing pipe 6, and seal it with three O-shaped rubber rings 5; The middle layer tube 8 in the middle layer is inserted into the middle layer sliding tube 3, because the inside and outside of the tube of this layer are all water, it is enough to fit tightly without sealing; the outer layer connecting pipe 2 of the nozzle is welded with the outer layer tube 7, and the nozzle spare parts and the oxygen The assembly of the gun body is complete. When replacing a new shower head, the weld seam between the outer layer connecting pipe 2 and the outer layer pipe 7 of the shower head is cut, and the spare parts of the old shower head can be taken off.

After the oxygen lance nozzle is scrapped, the oxygen lance should be removed from the converter or electric furnace, placed horizontally on the oxygen lance transport vehicle, transported to the oxygen lance maintenance workshop, the old nozzle spare parts should be removed, and new nozzle spare parts should be replaced. Because of the cutting of the welding seam between the nozzle outer layer connection pipe 2 and the outer layer pipe 7, a small part of the oxygen lance outer layer pipe 7 will be cut off at every turn. After the nozzle is replaced several times, the outer layer pipe 7 will be lengthened. After the nozzles are replaced, the water pressure inspection is carried out, and the oxygen lances that pass the inspection are transported back to the steelmaking workshop and hung on the steelmaking furnace. Therefore, the replacement of the oxygen lance nozzle will take a lot of time, especially the large converter oxygen lance, which is more than 20 meters long, is removed from the converter and reinstalled, requiring many people to operate.

Utility model content

The purpose of the utility model is to provide an oxygen lance nozzle without welding, which has a reasonable structure and can be replaced without leaving the steelmaking workshop.

In order to achieve the above object, the utility model is realized through the following technical solutions:

The oxygen lance nozzle without welding is composed of a copper nozzle, an oxygen lance outer tube, a nozzle inner tube, a high temperature resistant sealing ring, and an O-shaped rubber ring. It is characterized in that: the copper nozzle and the oxygen lance outer tube are connected through threads It is connected and sealed by a high-temperature-resistant sealing ring; the copper nozzle and the inner nozzle of the nozzle are connected by threads and sealed by an O-shaped rubber ring.

The beneficial effects of the utility model are:

1) The welding process between the copper nozzle and the outer layer nozzle and the inner layer nozzle is cancelled, and the outer layer nozzle 3 is not needed to be welded in the spare parts of the nozzle; energy is saved and the cost is reduced.

2) Replace the nozzle of the oxygen lance without cutting and welding, without removing the oxygen lance, and without transporting the oxygen lance back to the maintenance workshop. The nozzle can be replaced only next to the steelmaking furnace. It greatly simplifies the production process, shortens the time for changing guns, reduces the labor intensity of workers, improves production efficiency, and increases steel output.

Description of drawings

Fig. 1 is the structural representation of oxygen lance nozzle in the prior art;

Fig. 2 is a schematic structural view of the oxygen lance nozzle without welding of the present invention.

In Fig. 1 and Fig. 2: 1. Copper nozzle 2. Outer pipe 3. Middle sliding pipe 4. Inner nozzle pipe 5. O-shaped rubber ring 6. Inner sealing pipe 7. Outer pipe 8. Middle pipe 9. Inner tube 10. High temperature resistant sealing ring 11. O-shaped rubber ring

Detailed ways

As shown in Figure 2, the assembly process of the nozzle and the oxygen lance body is as follows: Insert the spare parts of the nozzle into the body of the oxygen lance, the copper nozzle 1 and the nozzle inner layer connecting pipe 4 are connected by threads, and are sealed by the O-shaped rubber ring 11, the nozzle The inner layer connecting pipe 4 and the inner layer sealing pipe 6 are sealed by three O-shaped rubber rings 5 , and an inner layer pipe 9 is welded on the top of the inner layer sealing pipe 6 . The middle layer pipe 8 of the nozzle slides in the middle layer sliding pipe 3, and the copper nozzle 1 and the outer connecting pipe 7 are connected by thread, and are sealed by a high temperature resistant sealing ring 10. The high temperature resistant sealing ring 10 is made of high temperature resistant elastic material.

Claims (2)

1. the oxygen lance blow head that need not weld, form by red copper shower nozzle (1), oxygen rifle outer tube (7), the adapter of shower nozzle internal layer (4), resistant to elevated temperatures sealed circular ring (10), O shape rubber ring (11), it is characterized in that: red copper shower nozzle (1) is connected by screw thread with oxygen rifle outer tube (7), and seals by resistant to elevated temperatures sealed circular ring (10); Red copper shower nozzle (1) is taken over (4) with the shower nozzle internal layer and is connected by screw thread, and seals by O shape rubber ring (11).

2. the oxygen lance blow head that need not weld according to claim 1 is characterized in that: described resistant to elevated temperatures sealed circular ring (10) adopts resistant to elevated temperatures resilient material.

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