CN210023254U

CN210023254U - Rolling mill frame with hot roll steam film breaking function

Info

Publication number: CN210023254U
Application number: CN201920415423.8U
Authority: CN
Inventors: 凌叶金
Original assignee: Nanjing Iron and Steel Co Ltd
Current assignee: Nanjing Iron and Steel Co Ltd
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-02-07
Anticipated expiration: 2029-03-28

Abstract

The utility model discloses a rolling mill frame with hot roll steam rupture of membranes function, through set up the steam rupture of membranes device by the roll, compressed air gets into each rupture of membranes nozzle through the rupture of membranes header of steam rupture of membranes device, and jet respectively to the roll that corresponds through each rupture of membranes nozzle, thereby break away the steam film that roll surface formed before roll cooling water sprays, avoid the steam film to stop cooling water production, for follow-up cooling provides the condition, promote roll cooling effect, reduce the roller and consume, reduce roll change frequency, promote production efficiency.

Description

Rolling mill frame with hot roll steam film breaking function

Technical Field

The utility model relates to a rolling mill frame, concretely relates to rolling mill frame with hot roll steam rupture of membranes function.

Background

In the production process of hot rolled steel, the cooling water of the roller can generate a steam film on the surface of the roller in the cooling process, and the steam film cannot be broken in a very short time due to the limited pressure of the cooling water of the roller, so that the roller surface cannot be directly cooled by the subsequent cooling water, the roller is quickly abraded, the size precision and the surface quality of a rolled product are influenced, the roller is frequently replaced, and the production efficiency and the cost are seriously influenced.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the defect of the prior art, the utility model provides a rolling mill frame with hot roll steam rupture of membranes function strengthens the cooling effect of cooling water to the roll.

The technical scheme is as follows: a rolling mill frame with hot roll steam rupture of membranes function, include from last at vertical direction to last backup roll, last work roll, lower work roll and the lower backup roll of arranging in proper order down, it is provided with the cooling water nozzle with the other all correspondence of work roll down to go up the work roll, the cooling water nozzle is used for to the last work roll and the lower work roll water spray cooling that correspond, its characterized in that, go up the work roll and all correspond with the other steam rupture of membranes device of having arranged of work roll down, steam rupture of membranes device has rupture of membranes collector and a plurality of rupture of membranes nozzle, and the directional last work roll of rupture of membranes device that corresponds with last work roll, the directional lower work roll of rupture of membranes nozzle of steam rupture of membranes device that corresponds with lower work roll, rupture of membranes nozzle sets up on rupture of membranes collector, and compressed air gets into each rupture of membranes nozzle through rupture of membranes collector to respectively jetting the steam film that is used for breaking the roll face on corresponding last work roll and the lower work roll through each rupture of membranes nozzle.

Has the advantages that: the rolling mill frame is provided with the steam film breaking device beside the working roll, the steam film formed on the surface of the roll is broken before the cooling water of the roll is sprayed, conditions are provided for subsequent cooling, the cooling effect of the roll is improved, the roll consumption is reduced, the roll changing frequency is reduced, and the production efficiency is improved.

Drawings

Fig. 1 is a schematic structural view of a rolling mill housing according to the present invention;

FIG. 2 is a schematic structural diagram of a steam membrane rupturing device disclosed in the embodiment;

fig. 3 is a schematic structural diagram of another steam membrane rupturing device disclosed in the embodiment.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the embodiment discloses a rolling stand with a hot roll steam film breaking function, which comprises an upper support roll 1, an upper working roll 2, a lower working roll 3 and a lower support roll 4 which are sequentially arranged from top to bottom in the vertical direction. High temperature rolled stock 10 passes between the upper and lower work rolls 2, 3 to effect rolling. The other side of the upper working roll 2 and the lower working roll 3 is correspondingly provided with a cooling water nozzle 5, and the cooling water nozzle 5 is used for spraying cooling water to the corresponding upper working roll 2 and the lower working roll 3 so as to cool the upper working roll 2 and the lower working roll 3.

In order to break the steam film formed on the roll surface by the cooling water, steam film breaking devices 6 are correspondingly arranged beside the upper working roll 2 and the lower working roll 3. As shown in fig. 2, the steam membrane rupturing device 6 has a membrane rupturing header 61 and a plurality of membrane rupturing nozzles 62, and the membrane rupturing nozzles 62 are all provided on the membrane rupturing header 61. The film breaking nozzle 62 of the steam film breaking device 6 corresponding to the upper working roll 2 points to the upper working roll 2, and the film breaking nozzle 62 of the steam film breaking device 6 corresponding to the lower working roll 3 points to the lower working roll 3. Compressed air enters each film breaking nozzle 62 through the film breaking header 61 and is respectively sprayed to the corresponding upper working roll 2 and the lower working roll 3 through each film breaking nozzle 62 so as to break the steam film on the roll surfaces. Wherein, the air pressure of the compressed air sprayed by the film breaking nozzle 62 is more than or equal to 0.4 MPa.

Further, the film breaking nozzles 62 and the cooling water nozzles 5 corresponding to the upper work roll 2 are both disposed on the same side of the upper work roll 2, and similarly, the film breaking nozzles 62 and the cooling water nozzles 5 corresponding to the lower work roll 3 are both disposed on the same side of the lower work roll 3. The film breaking nozzles 62 and the cooling water nozzles 5 are arranged in sequence along the rotation direction of the corresponding work rolls. So that the steam film on the surface layer of the roller surface can be broken before being cooled again by the cooling water spray.

Considering the uniformity of the cooling of the roller, the arrangement angles and the quantity proportion of the film breaking nozzles need to be reasonably distributed, and the nozzles at various angles can be selected according to the width of the roller surface and the distance between the film breaking nozzles and the roller surface, but the gapless purging is ensured. Therefore, in the present embodiment, the plurality of film breaking nozzles 62 on the steam film breaking device 6 have different injection angles to form a gapless sweep belt in the width direction of the roll surface. As shown in fig. 3, the protruding length of the film breaking nozzle 62 is also set as required.

More specifically, the distance between the film breaking nozzle 62 corresponding to each working roll and the cooling water nozzle 5 on the cooling line of the roll surface of the working roll is not less than 50 mm. Thereby avoiding the influence of cooling water splashing on the blowing and film breaking.

Claims

1. A rolling mill frame with a hot roll steam film breaking function comprises an upper supporting roll (1), an upper working roll (2), a lower working roll (3) and a lower supporting roll (4) which are sequentially arranged from top to bottom in the vertical direction, wherein cooling water nozzles (5) are correspondingly arranged beside the upper working roll (2) and the lower working roll (3), the cooling water nozzles (5) are used for spraying water for cooling to the corresponding upper working roll (2) and the corresponding lower working roll (3), the rolling mill frame is characterized in that steam film breaking devices (6) are correspondingly arranged beside the upper working roll (2) and the lower working roll (3), each steam film breaking device (6) is provided with a film breaking header (61) and a plurality of film breaking nozzles (62), the film breaking nozzles (62) of the steam film breaking devices (6) corresponding to the upper working roll (2) point to the upper working roll (2), and the film breaking nozzles (62) of the steam film breaking devices (6) corresponding to the lower working roll (3) point to the lower working roll (3), the film breaking nozzles (62) are arranged on the film breaking header pipes (61), and compressed air enters the film breaking nozzles (62) through the film breaking header pipes (61) and is respectively sprayed to the corresponding upper working roll (2) and the corresponding lower working roll (3) through the film breaking nozzles (62) to break the steam films on the roll surfaces.

2. A rolling mill stand with hot roll steam film breaking function according to claim 1, characterized in that the film breaking nozzle (62) and the cooling water nozzle (5) corresponding to the upper work roll (2) are both arranged on the same side of the upper work roll (2), and the film breaking nozzle (62) and the cooling water nozzle (5) corresponding to the lower work roll (3) are both arranged on the same side of the lower work roll (3).

3. A roll stand with hot roll steam film breaking function according to claim 2, characterized in that the film breaking nozzles (62) and the cooling water nozzles (5) are arranged in sequence along the direction of rotation of the corresponding work rolls.

4. A roll stand with hot roll steam film breaking function according to claim 1, characterized in that a plurality of film breaking nozzles (62) on each steam film breaking device (6) have different injection angles for forming a gapless sweep band in the width direction of the roll surface.

5. A rolling mill stand with hot roll steam film breaking function according to claim 1, characterized in that the film breaking nozzle (62) corresponding to each working roll is not less than 50mm away from the cooling line of the cooling water nozzle (5) on the roll surface of the working roll.

6. A rolling mill stand with hot roll steam film breaking function according to any one of claims 1 to 5, characterized in that the air pressure of the compressed air sprayed by the film breaking nozzle (62) is not less than 0.4 MPa.