CN111097801B

CN111097801B - Round roller cooling device

Info

Publication number: CN111097801B
Application number: CN201811265960.5A
Authority: CN
Inventors: 杨舒; 肖洋; 付晶
Original assignee: Bengang Steel Plates Co Ltd
Current assignee: Bengang Steel Plates Co Ltd
Priority date: 2018-10-29
Filing date: 2018-10-29
Publication date: 2021-09-17
Anticipated expiration: 2038-10-29
Also published as: CN111097801A

Abstract

The invention discloses a round roller cooling device which comprises a fixed seat, wherein a water inlet valve seat is arranged on the fixed seat and connected with the lower end of an arc-shaped spray pipe, and a spray head is arranged at the upper end of the arc-shaped spray pipe; the arc spraying pipe is internally provided with a high-pressure pipe, a round nozzle and a long-strip nozzle are arranged on the side, facing the round roller, of the arc spraying pipe, and the round nozzle is communicated with the high-pressure pipe; the long strip-shaped nozzle is communicated with the arc-shaped spraying pipe; the round nozzles and the strip-shaped nozzles are arranged at intervals. The invention has the advantages that: the reasonable cooling scheme is adopted, the round roller is firstly cooled preliminarily through the spray head, the cooling speed is avoided being too fast, then the high-temperature round spray head directly acts on the groove of the round roller, the cooling speed is ensured, the hardness of the groove of the round roller is further ensured, and then the round roller is uniformly cooled through the long-strip-shaped spray head, so that the round roller can be cooled reasonably, and the rolling quality is ensured.

Description

Round roller cooling device

Technical Field

The invention relates to the field of metallurgical machinery, in particular to a cooling device for a roller.

Background

The rolls are important parts of rolling mills in steel rolling mills, and roll steel by using pressure generated when a pair or a group of rolls roll. It mainly bears the influence of dynamic and static load, abrasion and temperature change during rolling. Mechanical stress during rolling is related to thermal stress of the roll, and particularly, the mechanical stress is more easily generated when the temperature difference between the surface of the roll body and the core part is large. Such temperature differences may be caused by poor roll cooling, cooling interruptions or overheating of the roll surface at the start of a new rolling cycle. The large temperature difference between the surface and the core of the roll causes large thermal stress, and the roll breakage is caused when the large thermal stress, mechanical stress, and residual stress of the roll exceed the core strength of the roll. For example, the roll may increase the longitudinal thermal stress by 100MPa at a temperature difference of 70 ℃ between the roll surface and the core, the greater the temperature difference, the greater the increased thermal stress. In addition, the surface of the roller is heated due to heat conduction of the workpiece during rolling, and the surface is damaged due to unreasonable cooling process, namely, the surface is too fast or too slow, and if the surface is too fast, crystal grains inside the surface become coarse, the toughness is affected, and brittle fracture is easy to occur; and if the rate is too slow, the carbide particles in the metal are not in dispersed distribution, and a certain hard layer depth cannot be ensured.

The main disadvantages of the existing cooling system are as follows: (1) the water supply of the guide and guard device cooling system is provided by a ground pipe network, the coverage area of the sleeve pipe network is too wide, the flow is insufficient, a branch hose is frequently damaged due to frequent plugging, the water supply amount is further reduced, and the cooling capacity of the existing guide and guard device is insufficient; (2) due to the particularity of bar mill production, the mill needs to be frequently disassembled and replaced, and the guide and guard system water pipe needs to be disassembled and assembled every time the mill is replaced due to the ground pipe network water supply form, so that the production efficiency is affected, and the cutting head and the hose are easy to damage; (3) because the ground pipe network water pipe is only arranged at the vertical roller mill, when the rolling mill is used as a sizing mill and used for a flat roller mill, the guide and guard are not available with the water pipe, so that the guide and guard of the sizing mill is not cooled; (4) the cooling water spray head of the roller groove is simple, only water is discharged in a common drilling mode, and the spray flow and the spray coverage area are insufficient due to over short and small parts, so that the cooling efficiency of the system is low; (5) the original design of the cooling spray head for the roll groove of the roll does not consider the problem of fixation, so that the spray head is inclined after being installed and cannot be aligned with the roll groove of the roll, thereby solving the problems of low cooling efficiency, high roll consumption, high product quality, excessive roll change frequency and the like.

Disclosure of Invention

In order to solve the technical problems, the invention aims to meet the production requirement through the optimized integration of a water supply system and the redesign of a spraying device. The specific technical scheme is as follows:

a round roller cooling device comprises a fixed seat, wherein a water inlet valve seat is arranged on the fixed seat and connected with the lower end of an arc-shaped spray pipe, and a spray head is arranged at the upper end of the arc-shaped spray pipe; the arc spraying pipe is internally provided with a high-pressure pipe, a round nozzle and a long-strip nozzle are arranged on the side, facing the round roller, of the arc spraying pipe, and the round nozzle is communicated with the high-pressure pipe; the long strip-shaped nozzle is communicated with the arc-shaped spraying pipe; the round nozzles and the strip-shaped nozzles are arranged at intervals.

And a clamping groove is arranged below the fixed seat and clamped on the protruding position of the guide beam, and the fixed seat is fixed with the guide beam through a bolt.

The water inlet valve seat is provided with a water inlet valve.

The radian of the arc-shaped spray pipe is the same as that of the round roller.

The width of the long strip-shaped nozzle is the same as that of the rolling groove.

The invention has the advantages that: the reasonable cooling scheme is adopted, the round roller is firstly cooled preliminarily through the spray head, the cooling speed is avoided being too fast, then the high-temperature round spray head directly acts on the groove of the round roller, the cooling speed is ensured, the hardness of the groove of the round roller is further ensured, and then the round roller is uniformly cooled through the long-strip-shaped spray head, so that the round roller can be cooled reasonably, and the rolling quality is ensured.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic view of a spray head, a circular spray head and a strip-shaped spray head.

Detailed Description

The invention is specifically described below with reference to the accompanying drawings, as shown in the drawings, the invention comprises a fixed seat 9, a water inlet valve seat 13 is arranged on the fixed seat 9, the water inlet valve seat 13 is connected with the lower end of an arc-shaped spray pipe 3, a spray header 2 is arranged at the upper end of the arc-shaped spray pipe, and spray holes 21 are arranged on the spray header; a high-pressure pipe 4 is arranged in the arc-shaped spraying pipe, a round nozzle 7 and a long-strip-shaped nozzle 8 are arranged on the side, facing the round roller, of the arc-shaped spraying pipe 3, and the round nozzle 7 is communicated with the high-pressure pipe 4; the strip-shaped nozzle 8 is communicated with the arc-shaped spraying pipe 3; the round nozzles 7 and the long-strip nozzles 8 are arranged at intervals. The structure ensures that the spray header 2 and the strip-shaped nozzle 8 are communicated with a water source with lower water pressure, and avoids the defects of brittle fracture and the like caused by the too fast cooling speed on the surface of the round roller;

a clamping groove 10 is arranged below the fixed seat 9, the clamping groove 10 is clamped at the protruding position of the guide beam 11, and the fixed seat 9 is fixed with the guide beam 11 through a bolt 12.

The water inlet valve seat 13 is provided with water inlet valves, one of which is communicated with a water source with small water pressure, the other valve is communicated with a high-pressure water source, and the high-pressure water source is communicated with the high-pressure pipe 4 through the valves.

In order to ensure uniform cooling, the radian of the arc spraying pipe is the same as that of the round roller; the width of the elongated spout is the same as the width of the rolling groove 14.

The principle of the invention is as follows: the round roller 1 rotates clockwise at the position shown in figure 1, a rolling groove 14 arranged along the axial direction of the round roller is tightly contacted with a workpiece at the lower part and then is subjected to heat conduction action, the surface temperature instantly reaches a high-temperature state, the rolling groove is firstly contacted with a spray header after being separated from the workpiece, and the spray header has lower water pressure and smaller spray amount, so that the rolling roller can be cooled at a slower speed, meets a round nozzle which has higher water pressure and high water flow speed after being cooled to a certain degree, the position of the round nozzle corresponds to the deepest part of the rolling groove, and at the moment, the cooling speed is faster, so that the surface hardness of the deepest part of the rolling groove is ensured; then, meet with rectangular shape spout, at this moment, rectangular shape spout is close with whole rolling recess's width, and rectangular shape spout cools off whole rolling recess with lower water pressure, has guaranteed that the cooling rate of rolling recess is appropriate.

Claims

1. A round roller cooling device is characterized in that: the spraying device comprises a fixed seat, wherein a water inlet valve seat is arranged on the fixed seat and is connected with the lower end of an arc spraying pipe, and a spraying head is arranged at the upper end of the arc spraying pipe; the arc spraying pipe is internally provided with a high-pressure pipe, a round nozzle and a long-strip nozzle are arranged on the side, facing the round roller, of the arc spraying pipe, and the round nozzle is communicated with the high-pressure pipe; the long strip-shaped nozzle is communicated with the arc-shaped spraying pipe; the round nozzles and the strip-shaped nozzles are arranged at intervals; the position of the circular nozzle corresponds to the deepest part of the rolling groove; the width of the long strip-shaped nozzle is the same as that of the rolling groove.

2. The round roll cooling device as claimed in claim 1, wherein: and a clamping groove is arranged below the fixed seat and clamped on the protruding position of the guide beam, and the fixed seat is fixed with the guide beam through a bolt.

3. The round roll cooling device as claimed in claim 1, wherein: the water inlet valve seat is provided with a water inlet valve.

4. The round roll cooling device as claimed in claim 1, wherein: the radian of the arc-shaped spray pipe is the same as that of the round roller.