Slab scarfing apparatus and method for controlling the same

Patent metadata

Field	Value
Publication number	US-10239143-B2
Application number	US-201415107281-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Dec 23, 2013
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A slab scarfing apparatus comprises: an upper nozzle unit having an upper surface nozzle for scarfing an edge portion of the upper surface of a slab and having a first side nozzle scarfing an upper edge portion of the side surface of the slab and moving together with the upper surface nozzle; a lower nozzle unit having a lower nozzle for scarfing an edge portion of the lower surface of the slab and having a second side nozzle scarfing a lower edge portion of the side surface of the slab and moving together with the lower nozzle; and a moving apparatus for moving the upper nozzle unit and the lower nozzle unit to allow the upper nozzle unit and the lower nozzle unit to be adjacent to or to be spaced apart from an edge portion of the slab. A method of controlling the apparatus is provided.

First claim

The invention claimed is:

1. A slab scarfing apparatus comprising:
an upper nozzle unit which comprises an upper surface nozzle which scarfs a corner portion of an upper surface of a slab and a first side nozzle which moves together with the upper surface nozzle while scarfing an upper corner portion of a side of the slab;
a lower nozzle unit which comprises a lower surface nozzle unit which scarfs a corner portion of a lower surface of the slab and a second side nozzle which moves together with the lower surface nozzle while scarfing a lower corner portion of the side of the slab;
a movement apparatus which moves the upper nozzle unit and the lower nozzle unit to be closer to or away from a corner portion of the slab, wherein the movement apparatus comprises: a first vertical movement portion which vertically moves the upper nozzle unit a second vertical movement portion which vertically moves the lower nozzle unit and a laterally moving portion which laterally moves while supporting the first vertical movement portion and the second vertical movement portion;
a frame capable of moving in a direction intersecting with a moving direction of the slab while being mounted on the laterally moving portion;
a moving rail which guides movement of the frame; and
a frame driving portion which moves the frame.

2. The slab scarfing apparatus of claim 1 , wherein the upper nozzle unit comprises an upper nozzle frame which comprises a horizontal supporting portion mounted with the upper surface nozzle and a vertical supporting portion mounted with the first side nozzle, and
wherein the lower nozzle unit comprises a lower nozzle frame which comprises a horizontal supporting portion mounted with the lower surface nozzle and a vertical supporting portion mounted with the second side nozzle.

3. The slab scarfing apparatus of claim 2 , wherein the upper surface nozzle is mounted on the horizontal supporting portion of the upper nozzle frame to be position-adjustable in a width direction of the slab, and
wherein the lower surface nozzle is mounted on the horizontal supporting portion of the lower nozzle frame to be position-adjustable in the width direction of the slab.

4. The slab scarfing apparatus of claim 1 , further comprising:
an upper guide unit which is installed on the upper nozzle unit to be in contact with an upper surface of the slab and maintains a gap between the upper surface of the slab and the upper surface nozzle; and
a side guide unit which is installed to be in contact with a side of the slab and maintains a gap between the side of the slab and the first side nozzle.

5. The slab scarfing apparatus of claim 4 , wherein the upper guide unit is provided to protrude in a direction in which the slab enters rather than the upper surface nozzle.

6. The slab scarfing apparatus of claim 1 , wherein the upper surface nozzle and the lower surface nozzle each comprise a preheating gas injection hole which forms flames for preheating the slab and an oxygen injection hole which embodies scarfing by injecting high pressure oxygen to a portion of the slab to be preheated.

7. The slab scarfing apparatus of claim 6 , wherein the upper surface nozzle and the lower surface nozzle each further comprise a fuel gas injection hole which heat the oxygen injected by the oxygen injection hole and guide an injection direction.

8. The slab scarfing apparatus of claim 1 , wherein the upper nozzle unit further comprises an oxygen injection hole disposed on a side of the upper surface nozzle to inject oxygen to a portion to be scarfed by the upper surface nozzle and an auxiliary upper nozzle comprising a fuel gas injection hole which heats the oxygen injected by the oxygen injection hole and guides the injection, and
wherein the lower nozzle unit further comprises an oxygen injection hole disposed on a side of the lower surface nozzle to inject oxygen to a portion to be scarfed by the lower surface nozzle and an auxiliary lower nozzle comprising a fuel gas injection hole which heats the oxygen injected by the oxygen injection hole and guides the injection.

9. The slab scarfing apparatus of claim 8 , wherein the upper surface nozzle and the lower surface nozzle each comprises an outlet cartridge partially detachably mounted to change a shape of the oxygen injection hole.

10. The slab scarfing apparatus of claim 1 , wherein the first side nozzle comprises an oxygen injection hole which injects oxygen for scarfing to an upper corner portion of a side of the slab and a fuel gas injection hole which heats the oxygen injected by the oxygen injection hole and guides the injection, and
wherein the second side nozzle comprises an oxygen injection hole which injects oxygen for scarfing to a lower corner portion of the side of the slab and a fuel gas injection hole which heats the oxygen injected by the oxygen injection hole and guides the injection.

11. The slab scarfing apparatus of claim 1 , wherein the upper nozzle unit, the lower nozzle unit, and the movement apparatus are disposed on each side of the slab, and
wherein at least one of the upper nozzle unit and the lower nozzle unit selectively operates to selectively scarf at least one of four corner portions of the slab.

12. A slab scarfing apparatus comprising:
an upper nozzle unit which comprises an upper surface nozzle which scarfs a corner portion of an upper surface of a slab and a first side nozzle which moves together with the upper surface nozzle while scarfing an upper corner portion of a side of the slab;
a lower nozzle unit which comprises a lower surface nozzle unit which scarfs a corner portion of a lower surface of the slab and a second side nozzle which moves together with the lower surface nozzle while scarfing a lower corner portion of the side of the slab;
a movement apparatus which moves the upper nozzle unit and the lower nozzle unit to be closer to or away from a corner portion of the slab; and
a slag chamber which is installed to surround front areas of the upper nozzle unit and the lower nozzle unit which the slab enters and collects slag scattered by scarfing of the slab and a high pressure water injection apparatus disposed in a slag scattering area inside the slag chamber.

13. A slab scarfing apparatus comprising:
an upper nozzle unit which comprises an upper surface nozzle which scarfs a corner portion of an upper surface of a slab and a first side nozzle which moves together with the upper surface nozzle while scarfing an upper corner portion of a side of the slab;
a lower nozzle unit which comprises a lower surface nozzle unit which scarfs a corner portion of a lower surface of the slab and a second side nozzle which moves together with the lower surface nozzle while scarfing a lower corner portion of the side of the slab;
a movement apparatus which moves the upper nozzle unit and the lower nozzle unit to be closer to or away from a corner portion of the slab;
a correction device which corrects a posture of the slab on a transfer path before entering a scarfing area in which the upper nozzle unit and the lower nozzle unit are located;
a width measuring sensor which measures a width of the slab to sense eccentricity of the slab which have passed through the correction device;
an entry sensor which senses an entry of a fore end of the slab at a position before the scarfing area;
a pinch roll which transfers the slab to the scarfing area in a clamped state after the entry of the slab; and
a nozzle position sensor which senses elevated positions of the upper and lower nozzle units to prevent a collision of the slab and the upper and lower nozzle units.

14. A slab scarfing

Assignees

• Posco

Inventors

• Lim Seung-Ho
• Park Yeong-Seon
• Kim Seong-Yeon
• Kim Ki-Hwan
• Yu Ji-Won

Classifications

• B23K7/102

  for controlling the spatial relationship between the workpieces and the gas torch · CPC title

• B23K2101/18

  Sheet panels · CPC title

• B23K7/06 Primary

  Machines, apparatus or equipment specially designed for scarfing or desurfacing · CPC title

• B23K2103/04

  Steel {or steel} alloys · CPC title

• B22D11/126

  for cutting · CPC title