JPH0615811U - Draining device for descaling water in hot rolling mill - Google Patents

Abstract

(57) [Abstract] [Purpose] In a drainer for removing the descaling water 5 sprayed on the hot rolled material 4, its draining effect is kept stable for a long time. [Structure] A non-contact type vacuum header 7 facing the surface of the hot rolled material 4 sucks and removes the descaling water 5 on the surface. Friction due to rubbing against the hot rolled material 4 does not occur in the vacuum header 7. The suction zone of the vacuum header 7 is changed according to the strip width of the hot rolled material 4.
The power required for suction is saved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drainer for removing descaling water sprayed on the surface of a hot rolled material from the surface.

[0002]

[Prior art]

 In the hot rolling mill, the front surface and the back surface of the rolled material advancing along the line are scaled. As this descaling device, a high pressure water jet type is often used.

In the high-pressure water jet type descaling device, the descaling water sprayed on the back surface of the hot-rolled material drops without any problem, but the descaling water sprayed on the surface is Because it accumulates on the surface and the injection direction is inclined to the upstream side, it flows out widely to the upstream side, the temperature drop of the rolled material and the generated steam adversely affect the upstream sensor, etc. It will cause such problems. Therefore, on the upstream side of the descaling device, a draining device for removing the desscaling water from the surface of the rolled material is provided.

As a device for draining descaling water in a hot rolling mill, a device using a draining wiper or a draining roll is generally used. Drainers using a drain wiper are disclosed, for example, in JP-B-63-3706 and JP-B-63-7371. The one using a draining roll, especially a pinch roll, is disclosed in, for example, JP-A-59-104212, and the one using a water absorbing ringer roll is disclosed in, for example, JP-A-63-192510. Further, a combination of a water-draining wiper and a water-draining roll is also disclosed in Japanese Utility Model Laid-Open No. 63-157410.

[0005] Although Japanese Utility Model Laid-Open No. 3-36305 does not mention that it is intended for hot-rolled material, the liquid remaining on the steel strip is removed by gas purging, while By sucking the gas near both edges of the steel sheet, a liquid flow is formed so that the liquid can be easily discharged to both sides, and a technology for promoting the removal of the liquid on the steel strip is disclosed.

[0006]

[Problems to be solved by the device]

 In a conventional descaling water drainer for a hot rolling mill, a draining wiper or a draining roll is brought into contact with the surface of the hot rolled material. Therefore, these contact members wear. There is no particular problem if this wear occurs evenly over the entire length in the plate width direction. However, since the hot rolling mill manufactures products with various strip widths, wear generally progresses toward the central portion in the strip width direction. When such a contact member is used, the surface of the hot-rolled material is scratched, and a gap is created between the hot-rolled material and the hot-rolled material, resulting in incomplete draining. Therefore, it is necessary to frequently inspect and replace the contact member, which increases the cost. In addition, there are limits to frequent inspections and replacements, and it is not uncommon for inspections and replacements to occur after a problem occurs.

An object of the present invention is to provide a descaling water draining device in a hot rolling mill capable of maintaining a stable draining effect for a long period of time without inspection and replacement.

[0008]

[Means for Solving the Problems]

 The descaling water draining device in the hot rolling mill of the present invention comprises a descaling header for injecting descaling water toward the surface of the hot rolled material and inclining in an upstream direction with respect to the surface. A descaling water draining device, which is installed on the upstream side and removes the descaling water on the surface of the hot rolled material from the surface, faces the surface of the hot rolled material in a non-contact state and A vacuum header having a horizontal width equal to or greater than the maximum strip width of the hot rolled material and having suction ports divided into a plurality of width directions, and a descaling water on the surface of the hot rolled material through the vacuum header. And the vacuum mechanism connected to the vacuum header so as to independently suction from each suction port of the vacuum header, and the strip width information of the hot rolled material. Based on, the feature that and a control mechanism for controlling the vacuum mechanism to perform the suction from the suction port corresponding to the range of the plate width.

[0009]

[Action]

 The descaling water on the surface of the hot rolled material is sucked and removed through the vacuum header which is not in contact with the hot rolled material. At this time, in the vacuum header, suction is performed only by the suction port corresponding to the strip width of the hot rolled material, and other suction ports are not used. That is, the suction zone of the vacuum header is scaled up or down according to the strip width of the hot rolled material.

Incidentally, Japanese Utility Model Laid-Open No. 3-36305 discloses a draining technique using a vacuum. The vacuum is mainly used for forming an air flow, and the main drainer is gas purging. Therefore, the concept is different from that of the draining device of the present invention. Furthermore, although gas purging is effective in eliminating chromate coating liquid in plating lines and coolant in liquid rolling mills, it is a draining effect for descaling water of hot rolled materials with enormous flow rates. Is small.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the vicinity of a draining device showing an embodiment of the present invention, FIG. 2 is a plan view of the vicinity of the draining device, and FIG. 3 is a perspective view of a vacuum header of the draining device.

A high-pressure water jet type descaling device 1 is provided on the rolling material entry side of the hot rolling mill. The descaling water device 1 includes a pair of upper and lower descaling headers 2 and 2. The descaling headers 2 and 2 inject the descaling water 5 toward the front surface and the back surface of the hot rolled material 4 conveyed on the table roll 3. The jetting direction is inclined to the upstream side.

A drainer 6 for the descaling water 5 is arranged upstream of the descaling header 2 on the surface side. The water draining device 6 is provided with a non-contact type vacuum header 7 facing the surface of the hot rolled material 4 over the entire width thereof.

As shown in FIG. 3, the vacuum header 7 has a large number of suction ports 9 formed by partitioning the inside by partition plates 8 arranged at equal intervals in the plate width direction of the hot rolled material 4. The multiple suction ports 9 are arranged in the plate width direction of the hot rolled material 4 at a pitch of, for example, 20 to 50 mm, and the total length thereof, that is, the entire width of the vacuum header 7 is the same as the maximum plate width of the hot rolled material 4. It is set. One end of a suction pipe 10 is connected to each suction port 9.

A valve 11 is provided in each suction pipe 10. The other end of each suction pipe 10 is connected to a water / air separator 12, and a suction device 13 is connected to the water / air separator 12. The valve 11, the water-air separator 12 and the suction device 13 are controlled by the control unit 14.

The vacuum header 7 is also moved up and down between an upper standby position and a lower operating position by a pair of left and right cylinders 15, 15. The operations of the cylinders 15 and 15 are also controlled by the control unit 14.

An air purge header 16 for ejecting air toward the surface of the hot rolling mill 4 is disposed on the upstream side of the vacuum header 7 with a slight inclination toward the downstream side. On the other hand, on the downstream side of the vacuum header 7, a material sensor 17 for detecting the hot rolled material 4 in a non-contact manner is provided between the descaling header 2 and the material sensor 17. The output of the material sensor 17 is input to the control unit 14 together with the plate width information output from the process computer 18.

Next, operations of the descaling device 1 and the water draining device 6 will be described.

Until the tip of the hot-rolled material 4 passes below the material sensor 17, the vacuum head 7 is at the upper standby position. The standby position is, for example, about 300 mm high from the surface of the hot rolled material 4.

When the tip of the hot rolled material 4 passes under the material sensor 17, the material sensor 17 detects the hot rolled material 4, and the signal is input to the control unit 14. When the material detection signal is input from the material sensor 17, the control unit 14 gives an operation command to the cylinders 15 1, 15 2 to lower the vacuum header 7 to the lower operating position. The operation position of the vacuum header 7 is, for example, 5 mm from the surface of the hot rolled material 4 so that the lower end of the vacuum header 7 is immersed in the water film of the descaling water formed on the surface of the hot rolled material 4. It is considered high.

The control unit 14 also receives the strip width information of the hot rolled material 4 from the process computer 18, and among the many suction ports 9 of the vacuum header 7, the suction port located directly above the hot rolled material 4. In order to open 9, the opening command is sent to the valve 11 of the suction pipe 10 connected to the suction port 9. Further, the operation command is also sent to the water / air separator 12 and the suction device 13. As a result, suction starts at the suction port 9 located right above the hot rolled material 4. Further, the air purge is started from the air purge header 16 toward the surface of the hot rolled material 4.

On the other hand, in the descaling device 1, when the surface of the hot-rolled material 4 passes below the material sensor 17, the descaling headers 2 and 2 descale toward the front and back surfaces of the hot-rolled material 4. Scaling water begins to be sprayed. The descaling water sprayed on the back surface of the hot rolled material 4 is naturally drained by gravity.

The descaling water sprayed on the surface of the hot-rolled material 4 flows upstream on the surface and reaches the lower side of the vacuum header 7 where it is sucked into the suction port 9. A part of the gas passes under the suction port 9 and flows to the upstream side, but is retained and stopped by the air jetted from the air purge header 16 to the surface of the hot rolled material 4. Therefore, this is also sucked into the suction port 9. The desiccant water sucked into the suction port 9 together with the air is sent to the water-air separator 12 through the suction pipe 10, where it is separated from the air and discharged.

In this way, the descaling water sprayed on the surface of the hot rolled material 4 is removed from the surface thereof. At this time, the vacuum header 7 is not in contact with the surface of the hot rolled material 4, and the air purge header 16 is also not in contact. Therefore, the surface of the hot rolled material 4 is not scratched, and the headers are not worn. Therefore, even if it is used for a long period of time, the drainage capacity does not decrease, and frequent inspection and replacement are not required. Further, since the suction zone of the vacuum header 7 is changed according to the strip width of the hot rolling mill 4, the power required for suction can be saved and the reduction of suction capacity due to emptying can be prevented.

[0025]

[Effect of device]

 As is clear from the above description, the descaling device for draining water in the hot rolling mill of the present invention removes the descaling water on the surface of the hot rolled material from the surface without contacting the surface. There is no risk of scratching. In addition, there is no wear on the side of the draining device due to rubbing against the hot rolled material, and the draining capacity does not deteriorate even after long-term use. Therefore, replacement of parts is not required, and the frequency of inspection can be greatly reduced. Furthermore, since the suction zone can be changed according to the strip width of the hot-rolled material, the power required for suction can be saved and the economical efficiency can be improved in this respect as well.

[Brief description of drawings]

FIG. 1 is a side view of the vicinity of a draining device showing an embodiment of the present invention.

FIG. 2 is a plan view of the vicinity of the draining device.

FIG. 3 is a perspective view of a vacuum header of the water draining device.

[Explanation of symbols]

 1 Descaling device 2 Descaling header 4 Hot rolled material 5 Descaling water 6 Draining device 7 Vacuum header 9 Suction port 10 Suction pipe 16 Air purge header 17 Material sensor

Claims (1)

[Scope of utility model registration request] 1. A hot-rolled material, which is disposed toward the surface of a hot-rolled material and is arranged on the upstream side of a descaling header that injects descaling water inclining in an upstream direction with respect to the surface. A descaling water drainer that removes the descaling water on the surface of the hot-rolled material in a non-contact state facing the surface of the hot-rolled material and has a width equal to or greater than the maximum width of the hot-rolled material. And a vacuum header having suction ports divided into a plurality of widths in the width direction, and descaling water on the surface of the hot-rolled material is sucked and removed through the vacuum header, and each suction port of the vacuum header is removed. Vacuum mechanism connected to the vacuum header so as to perform suction independently from each other, and based on the strip width information of the hot rolled material, suction is performed from the corresponding suction port within the strip width range. And a control mechanism for controlling the vacuum mechanism so as to perform the descaling water draining device in the hot rolling mill.