JP3314286B2 - Descaling recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for hot or cold rolling a steel material, which comprises peeling scale peeled off from the steel material surface by collision with high-pressure water, waste water after collision with the steel material, and steam generated by the waste water. And a descaling recovery device capable of efficiently recovering wastewater.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, when a steel material is rolled, the scale adhered to the upper and lower surfaces of the steel material impinges on jets 2 and 2 jetted from upper and lower high-pressure water nozzle devices 1a and 1b. From the surface of the steel material 3. On the other hand, the scale is peeled off by colliding with the steel material 3, and the wastewater mixed with most of the peeled scale is heated by contact with the steel material 3, flows on the surface of the steel material 3 in the direction of arrow a while generating steam 4,
Then, it falls around the steel material 3.

[0003] Therefore, peripheral equipment such as a roller table is always covered with steam during work, and is polluted by a peeling scale. In the figures, 5 and 5 are rolling rolls, 6 and 6 are backup rolls, and 7 is a roller for a roller table.

[0004]

Conventionally, although not shown here, various measures have been attempted to provide a hood or a cover around the steel material to prevent scattering of wastewater and steam containing the peeling scale. Have been. However, in these measures, since the scattering of wastewater and steam is widespread, the size of the apparatus becomes large, and it has been difficult to establish efficient measures. Further, during descaling, the steel 3 is covered with the wastewater injected from the high-pressure water nozzle devices 1a and 1b, so that there is a problem that the temperature of the steel 3 is reduced and the rolling efficiency is reduced.

SUMMARY OF THE INVENTION In view of the above problems, the present invention collectively collects wastewater containing exfoliated scale and steam generated by wastewater, and efficiently treats the collected steam and wastewater to reduce the size of the apparatus. The first problem is to achieve the reduction of the temperature of the rolled material, and the second problem is to prevent the temperature of the rolled material from decreasing.

[0006]

According to the present invention, there are provided two means according to the present invention for solving the above-mentioned problems. (Claim 1) At the time of hot or cold rolling of a steel material, a descaling recovery for recovering a peeling scale peeled off from a steel material surface by a collision with high-pressure water, a wastewater after a collision with the steel material, and a steam generated by the wastewater. An upper and lower low-pressure water injection device for injecting low-pressure water at a gentle inclination angle to the steel material so as to oppose the flow of wastewater along the surface of the steel material; Upper and lower hoods open to the rolling mill side, upper and lower collection ducts attached to the base of each hood, steam discharge ducts installed above each collection duct, and attached below each collection duct A descaling recovery device, comprising: a recovery duct, wherein an upper low-pressure water injection device is mounted on a lower surface of the upper hood, and a lower low-pressure water injection device is mounted on an upper surface of the lower hood. (Claim 2) The position where the jet of high-pressure water collides with the steel material,
The descaling recovery device according to claim 1, wherein an interval between the low pressure water jet and a position where the low pressure water jet collides with the steel material is set to a minimum.

[0007]

[Action]

(1) The flow of the wastewater including the separation scale collides with the jet jet injected from the low-pressure water jet device, and the flow is blocked, and flies in the air so as to move away from the surface of the steel material. Taken into the hood. (2) The steam generated by the wastewater proceeds along with the flow of the wastewater and is taken into the upper and lower hoods.

(3) The steam collected in the upper and lower collecting ducts through each hood is guided upward through the steam discharging duct, and the separated scale collected in the upper and lower collecting ducts is removed. The contained wastewater is led down through a recovery duct. (4) As a result, the peel scale, water and steam can be efficiently collected, and the size of the equipment can be reduced.

(5) According to the second aspect, since the wetted area on the surface of the steel material is minimized, the temperature of the steel material can be prevented from lowering.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show one embodiment of the present invention. The main part of this embodiment is that a low pressure water of about 2 atm is applied to a steel material 11.
Upper and lower low-pressure water injection devices 12a, 1
2b, upper and lower hoods 13a and 13b opened near the upper and lower surfaces of the steel material 11, upper and lower collecting ducts 14a and 14b attached to the bases of the hoods 13a and 13b, and a center of the upper collecting duct 14a. A total of three steam discharge ducts 15a, 15b, 15b attached to the upper part of the upper and lower ends of the lower collecting duct 14b, and the upper collecting duct 14
a total of four collection ducts 16a and 16 attached to the lower part of both ends of the lower collection duct 14b.
a, 16b, 16b and the like.
At the ends of the collection ducts 16a, 16a, 16b, 16b, the two ducts on both sides join the collecting ducts 17a, 17b on both sides, respectively, and the collecting ducts 17a, 1 on both sides are further joined.
The end of 7b opens into a collection pit 18 provided on the ground.

As shown in FIG. 3, each of the upper and lower low-pressure water injection devices 12a and 12b has a number of nozzles 20 (9 in the figure) arranged in a row on a header 19, and the upper low-pressure water injection device 12a is an upper high-pressure water nozzle device 22a
Jet stream 2 so as to inject low-pressure water in the direction of
3 is attached to the lower surface of the upper hood 13a so as to intersect with the surface of the steel material 11 at a gentle inclination angle (about 10 degrees), and the lower low-pressure water injection device 12b is connected to the lower hood 13b in the same manner as described above. 13b is attached to the upper surface. The distance g between the position e where the jet 23 collides with the steel material 11 (see FIG. 3) and the position f where the high pressure water jet 2 collides with the steel material 11 is set to a minimum as long as the apparatus can be arranged. .

The opening of each of the hoods 13a and 13b is rectangular, the width of which is slightly larger than the width of the steel material 11, and the height of which is to take in most of the steam 24 that travels with the wastewater. Is set large enough.

The upper and lower collecting ducts 14a and 14b have a rectangular cross section, extend horizontally across the steel material 11 as shown in FIG. 2, and have steam discharging ducts 15b and 15b attached to the lower collecting duct 14b. Is the upper collection duct 14a
Into the steam discharge duct 15a attached to the refrigeration system.

As shown in FIG. 2, the upper collecting duct 14a has a mounting member 25 and four hydraulic cylinder devices 2 as shown in FIG.
6, 26, 26, 26, and is suspended by a gate-shaped base 27, and the hydraulic cylinder devices 26, 2
When 6, 26, 26 are simultaneously expanded and contracted, the mounting height of the upper collecting duct 14a changes in the vertical direction.

This structure is intended to keep the distance between the upper low-pressure water injection device 12a and the upper surface of the steel material at a constant size even when the thickness of the steel material 11 changes. 11 makes it possible to make the inclination angle and the collision energy of the jet 23 coincide with the planned value, and reliably plays the role of the low-pressure water injection device of blocking and jumping the flow of the wastewater as described later. Can be executed.

In order to easily adjust the mounting height of the upper collecting duct 14a, a distance sensor (not shown) is attached to the upper collecting duct 14a, and the distance between the surface of the steel material 11 and the distance sensor is constantly measured. It is convenient to detect and automatically control the hydraulic cylinder device.

Further, in order to absorb a change in the mounting height of the upper collecting duct 14a, the connection between the upper collecting duct 14a and the steam discharge duct 15a and the collecting ducts 16a, 16a attached to the upper collecting duct 14a are removed. The bellows-like expansion joints 28, 28, 28 are provided in the middle part.

In the above description, the steam discharge duct 15
b and 15b are joined to the steam discharge duct 15a (see paragraph 0013), and the collection ducts 16a, 16a, 1
6b and 16b are merged with the collecting ducts 17a and 17b (see paragraph 0010), but instead of merging them, they are all separately guided and independent collection units are respectively provided on the upper and lower surfaces of the steel material 11. It may be configured.

Next, the handling procedure and operation of the apparatus of this embodiment will be described. First, the hydraulic cylinder devices 26, 2
6, 26, 26 to operate the upper low-pressure water injection device 1
The mounting height of the upper collecting duct 14a is adjusted so that the distance between 2a and the upper surface of the steel material becomes a predetermined dimension, and then the lower and upper low-pressure water injection devices 12a and 12b are operated.

The level of the lower surface of the steel material 11 is constant irrespective of the change in the thickness of the steel material 11, and when the lower collecting duct 14b is installed, the distance between the lower low-pressure water jetting device 12b and the lower surface of the steel material is predetermined. Since the installation position is set so as to be the size, there is no need to adjust the mounting height of the lower collection duct 14b.

When the rolling mill 29 is operated, the steel material 1
1 is rolled in the direction of arrow b. During rolling, the upper and lower high-pressure water nozzle devices 22a and 22b inject high-pressure water of about 150 atm onto the surface of the steel material 11. The scale adhered to the surface of the steel material 11 is peeled off by the collision of the high-pressure water, and most of the peeled scale is mixed into the wastewater after the collision. Then, the wastewater travels in a direction opposite to the traveling direction of the steel material 11 while generating steam 24 along the upper and lower surfaces of the steel material 11.

On the other hand, the low pressure water jets 23, 23 injected from the low pressure water injection devices 12a, 12b collide with the flow c of the waste water flowing on the surface of the steel material 11. At this time, since the low pressure water jets 23, 23 collide with the surface of the steel material 11 at a gentle inclination angle, the flow C of the wastewater is once caused by the low pressure water.
It is dammed, jumps upward, flies in the air so as to move away from the surface of the steel material 11 (see arrow d), enters the upper and lower hoods 13a, 13b with accompanying steam, and enters each hood 13a. , 13b connected to the upper and lower collection ducts 1
4a, 14b.

The large-volume steam collected in the collecting ducts 14a and 14b is discharged from the steam discharging ducts 15a and 15b.
b and 15b are discharged intensively upward, and the wastewater having a large specific gravity is collected in the recovery duct 16 in a state where the wastewater contains the exfoliated scale.
a, 16a, 16b, and 16b, and is collected by the collection pit 18 through the collecting ducts 17a and 17b.

The wastewater containing the exfoliated scale does not fall from the steel material 11 and accompanies the steam and accompanies the steam.
a, 13b, the roller table 30
And other peripheral devices are not covered with steam or stained by the peel scale.

The present invention is not limited to the above-described embodiment. For example, a screw mechanism may be used instead of the hydraulic cylinder device as a device for adjusting the mounting height of the upper collecting duct. Of course, various changes can be made without departing from the spirit of the present invention.

[0026]

As described above, the present invention has the following excellent effects. (1) After collecting the peeling scale, water and steam collectively in the collecting duct, the steam in the collecting duct is discharged upward through the steam discharging duct, and the wastewater containing the peeling scale is recovered through the collecting duct. Therefore, efficient collection is possible, and the size of the apparatus can be reduced.

(2) Since the interval between the position where the high pressure water jet collides with the steel material and the position where the low pressure water jet collides with the steel material is set to a minimum, the wet area of the steel material surface is minimized. In addition, it is possible to prevent the temperature of the steel material from dropping.

[Brief description of the drawings]

FIG. 1 is a cut-away side view of an embodiment of the present invention.

FIG. 2 is an arrow view from the II-II direction in FIG. 1;

FIG. 3 is a plan view of a high-pressure water nozzle device and a low-pressure water injection device.

FIG. 4 is a side view of the descaling device.

FIG. 5 is a view from arrow VV in FIG. 4;

[Explanation of symbols]

 11 Steel material 12a, 12b Low-pressure water injection device 13a, 13b Food 14a, 14b Collection duct 15a, 15b Steam discharge duct 16a, 16b Recovery duct

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 45/08 B08B 3/08 B08B 5/04

Claims (2)

(57) [Claims] 1. A descaling recovery for recovering a peeled scale peeled from a steel material surface by a collision of high-pressure water during hot or cold rolling of a steel material, a wastewater after a collision with the steel material, and a steam generated by the wastewater. An upper and lower low-pressure water injection device for injecting low-pressure water at a gentle inclination angle to the steel material so as to oppose the flow of wastewater along the surface of the steel material; Upper and lower hoods open to the rolling mill side, upper and lower collection ducts attached to the base of each hood, steam discharge ducts installed above each collection duct, and attached below each collection duct A descaling recovery device, comprising: a recovery duct, wherein an upper low-pressure water injection device is mounted on a lower surface of the upper hood, and a lower low-pressure water injection device is mounted on an upper surface of the lower hood. 2. A position where a jet of high-pressure water collides with a steel material;
The descaling recovery device according to claim 1, wherein an interval between the low pressure water jet and a position where the low pressure water jet collides with the steel material is set to a minimum.