KR20040021715A - Automatic scarfing apparatus of surface defects from slab - Google Patents

Abstract

PURPOSE: An automatic scarfing apparatus is provided which is capable of removing defects on the surface of slab more easily and uniformly by injecting flame onto the slab from a certain height and heating a larger area of the surface of the slab at the same time. CONSTITUTION: The apparatus for automatically scarfing defects on the surface of slab comprises a transport part for horizontally transporting the slab by loading a slab to be scarfed on transfer car; a scarfing part which is arranged at an upper side of the transport part to scarf an upper surface of the slab, and at a lower front part of which at least a pair or oxygen and gas injecting appliances are installed; and a working monitoring part comprising at least one or more cameras (CF,CR) arranged at a lower one side of the scarfing part to observe the surface conditions of the slab, and at least one or more of display devices for displaying the surface conditions of the slab, wherein the scarfing part further comprises a wire feeder(26) connected to the scarfing part by a supporting frame with the wire feeder being spaced apart from a lower front end of the scarfing part in a certain distance, and the gas injection appliances comprise a pipe shaped first gas injection appliance(31) arranged between the front end of the scarfing part and the wire feeder to inject gas and oxygen to the wire feeder side; and second injection appliances comprising a plurality of oxygen and gas nozzles arranged along width of the scarfing part at a lower front end of the scarfing part to inject gas and oxygen to the wire feeder side, and wherein the scarfing part comprises a skid(42) installed on a lower side surface of the scarfing part and slidingly contacted with an upper surface of the slab.

Description

Slab Surface Defect Automatic Grinding Device {AUTOMATIC SCARFING APPARATUS OF SURFACE DEFECTS FROM SLAB}

The present invention relates to an apparatus for automatically grinding and removing the surface defects of the slab produced in the playing process.

Slabs, which are usually produced in the casting process, are cut into dimensions of approximately 230 mm thick, 850-2,000 mm wide and 5,500-12,000 mm long to meet the needs of the consumer. High quality slabs are rolled into hot rolled and cold rolled coils by means of a hot strip mill furnace immediately upon production. However, if the slab has surface defects such as grooves, the rolled coil product will be of poor quality. Therefore, the slab is peeled off through a scarfing operation to remove defects on the surface and then charged into a hot-rolled furnace. Surface scarping such as ingots and slabs include torch scarfing, hot scarfing, powder scarfing, and the like.

The scarfing operation is usually done by hand, an example of such a conventional scarfing operation is shown in FIG. As shown in FIG. 1, the worker 102 walks over the slab 101 and scarves the surface defects of the slab with the hand torch 103 shown in FIG. 2. In the scarfing operation, the operator 102 first opens the oxygen and gas valves 106 and 107 of the hand torch 103 to ignite and then adjusts the valve to be able to preheat the slab. Subsequently, the crater 105 is closely adhered to the slab 101 at regular intervals, and when preheating is performed, the capping is performed by melting the slab surface by holding the handle 104 and pressing the lever 108 to inject high pressure oxygen.

However, the conventional working method as described above has the following problems. First, when the slab is surface-treated, the circular crater must maintain a constant height and angle, so that the slab can be scarped to a non-uniform surface state according to the skill or method of the operator, and the quality of the slab may be deteriorated. have. Secondly, since the work is performed manually, excessive work time is required to cut the entire surface of the slab, which reduces production capacity. Third, scattering scale is generated during the scarfing operation to splash on the face and eyes of the worker and dust may be generated to damage the worker's respiratory system.

Therefore, the present invention has been made to solve the above-described problems of the prior art, an object of the present invention is to easily and uniformly remove the surface defects of the slab by simultaneously heating a wider slab surface while spraying the flame at a constant height. It is to provide an automatic cutting device capable of.

Another object of the present invention is to provide an automatic cutting device capable of performing precise and uniform cutting by grasping the surface state of the slab before and after cutting with a camera.

1 is a perspective view showing an example of a slab cutting operation according to the prior art.

2 is a perspective view of a hand torch used in slab cutting operation according to the prior art;

3 is a perspective view of an automatic cutting device for slab surface defects according to the present invention.

4 is a perspective view showing in detail the cutting head and adjacent components shown in FIG.

5 is a side view of FIG. 4.

6 is an enlarged view of the main part of FIG. 5;

7 is a schematic diagram illustrating in steps a method of preheating a slab surface.

8 and 9 are schematic diagrams illustrating multiple forms of surface defects distributed on the surface of the slab.

<Explanation of symbols of main parts in drawings>

12: rack 16: the balance

19: slab 20: cutting head

22: cylinder 26: feeder

31: spray mechanism 36: gas nozzle

37: oxygen nozzle 41: injection guide

42: Skid C _F , C _R : Camera

W: wire

In order to achieve the above object of the present invention, an apparatus for automatically grinding defects on the surface of a slab provided according to a feature of the present invention includes: a transport unit configured to load the slab to be machined on a trolley and transport it horizontally; A cutting portion disposed above the conveying portion so as to cut the upper surface of the slab and including at least a pair of oxygen and gas injection mechanisms at a lower end thereof; And at least one camera disposed at one lower side of the cutting part to observe the surface state of the slab, and at least one display device to display the surface state.

Various features and advantages of the present invention described in connection with the accompanying drawings will be apparent to those of ordinary skill in the art.

3 is a perspective view of an automatic cutting device for slab surface defects according to the present invention. Referring to the illustrated automatic cutting device 10, an overpass-shaped base 11 having two pillars and a connecting frame in the form of a bar connecting the upper portions of these pillars is installed, and the base 11 is provided under the base 11. A slide table or trolley 16 which is slidable along a pair of rails 17 extending across 11 is provided. The configuration of the trolley 16 and the rails 17 is exemplary and the trolley 16 may be configured to be moved by, for example, a chain and a rope. Each stopper 18 is installed at the front end of the rail 17 to prevent the trolley 16 from moving further. On the trolley 16 a slab 19 to be machined is seated and transported by the trolley 16. The base 11 has a middle portion extending horizontally with a predetermined height from the ground, and the rack 12, which is a flat gear, is installed at the middle portion. The movement mechanism 14 supported by the base 11 is horizontally moved along the middle portion of the base 11 by the gear of the motor 13 meshing with the rack 12. On the other hand, the movement mechanism 14 may also take a different configuration from the above so as to be moved along the connection frame of the base 11 by a hydraulic / pneumatic cylinder, a belt, a chain or the like. The front of the moving mechanism 14 is provided with a head housing 15 having an open lower portion in the form of a rectangular box, and the head 20 for performing the grinding operation is perpendicular to the moving mechanism 14 below the head housing. It is attached to be movable. The moving mechanism 14, the head housing 15, and the cutting head 20 together form a cutting unit. In addition, since the main function of the head housing 15 is to embed various pipes and wires connected to the lower components of the cutting unit, which will be described later, the head housing 15 can be omitted as necessary. In the figure, a cab 21 is provided on the left side of the base 11 in which an operator can check and control the driving operation and the driving of the trolley 16 and the like.

4 is a perspective view showing in detail the cutting head 20 and adjacent components shown in FIG. As compared with FIG. 3, the same road is reversed left and right for convenience of illustration. FIG. 5 is a side view of FIG. 4, and FIG. 6 is an enlarged view of the main part of FIG. 5. 4 to 6 will be described below in connection with convenience.

The illustrated cutting head 20 is attached to the moving mechanism 14 by a cylinder 22. The cutting head 20 is moved up and down by the compression and expansion operation of the cylinder 22. Although only one is shown in the drawing, a plurality of cylinders 22 are provided as necessary, so that the upper frame of the welding head 20 ( 23) can be fixed by pins or the like in a line. The lower frame 24 is coupled to the lower side of the upper frame 23, and the lower frame 24 is coupled to the guide 25 by bolts or the like from the rear side. The guide 25 is formed with a slot S from an intermediate portion to an upper portion. In this slot S, a pin or bolt fixed to the moving mechanism 14 is inserted with a certain clearance. Accordingly, when the cylinder 22 moves the welding head 20 up and down, the guide 25 slides through the slot S to prevent the welding head 20 from tilting.

In front of the upper frame 23, a feeder 26 for feeding wire W is provided. The feeder 26 has a feeding head 27 having a pair of rollers 28 for moving the wires W during the grinding operation, a motor M for driving the rollers 28, and the feeding head 27 ) And a support frame 29 attached to the upper frame 23 so as to support the motor M and a wire (not shown) having a wire (not shown) for supplying power to the motor and a lower portion of the feeding head 27. It is provided with a feeding guide 30 to guide. The wire W is fed from the wound wire spool SP, which is attached to a recess formed in one side wall of the moving mechanism 14.

The wire W extends from its end to a position adjacent to the slab 19 and the nozzle of the spray mechanism 31 located between the feeder 26 and the upper frame 23 towards the wire W at this position. At 32, oxygen and gas are injected and combusted.

The spray mechanism 31 is coupled to the upper frame 23 by a support bracket 33, the lower body is bent in the form of a hollow pipe and a flexible gas hose 34 and oxygen installed inside the body A hose 35. The gas and oxygen hoses 34, 35 extend through the interior of the head housing 15, indicated by phantom lines in FIG. 5, and are inserted into the spray mechanism 31.

A plurality of gas nozzles 36 for injecting a large amount of gas are formed along the width of the lower frame 24 at the rear of the spray nozzle 32, that is, the front lower side of the lower frame 24. Under the nozzle 36, a plurality of oxygen nozzles 37 for injecting a large amount of oxygen are formed along the width of the lower frame 24. The gas nozzle 36 is connected to the gas pipe 38 and the oxygen nozzle 37 to the oxygen pipe 39. These gas and oxygen pipes 38 and 39 are connected to the head housing 15 and the upper frame. It extends to the nozzles 36 and 37 through the inside of the 23 and the lower frame 24. On the other hand, the shoe block 40 is provided below the oxygen nozzle 37 to prevent the nozzles 36 and 37 or the lower frame 24 from directly contacting the hot slab 19 heated by the flame.

A pair of injection guides 41 are provided at both sides of the nozzles 36, 37 of the lower frame 24. The injection guide 41 prevents the generated flame from excessively spreading outward in the width direction of the slab 19 while guiding the gas and oxygen injected from the nozzles 36 and 37 to move to the combustion point without spreading.

A pair of skids 42 are also provided on the outside of the jet guide 41. The skid 42 comes into contact with the surface of the slab 19 when the cutting head 20 is lowered by the cylinder 22. During operation, the trolley 16 slides the surface of the slab 19 as it moves to the working direction, ie to the left of the figure. The skid 42 may thus maintain a constant height from the slab 19 in which the gas and oxygen are injected and combusted by contacting the slab 19.

Cameras C _F and C _R are provided at positions adjacent to each end of the skid 42. The first camera C _F is disposed to face toward the lower frame 24 at the end of the skid 42 to photograph the surface state before the slab 19 is melted, thereby controlling the control device (not shown) and the cab ( 21, and to a display device such as a monitor (not shown) installed in the figure. On the other hand, the second camera C _R is generally disposed to face toward the outside of the end of the skid 42 to photograph and transmit the surface state of the slab 19 after the grinding operation to the control device and / or the monitor. Accordingly, the operator can check the surface state of the slab 19 and control the work.

On the other hand, the control device may be composed of a CPU and the like, and is installed to control the above-described components. The control device operates by a preset program or direct manipulation of an operator to transmit a control signal for controlling the grinding operation to each component, and receives a response signal from each component and outputs it to the monitor.

Hereinafter, the method of melting the surface of the slab 19 using the automatic grinding apparatus of this invention is demonstrated.

7 shows step by step how to preheat the slab 19 surface. First, in FIG. 7A, preheating is started by supplying gas to the wire W through the spray nozzle 32. In FIG.7 (b), high pressure oxygen is supplied to the spray nozzle 32, and grinding of the surface of the slab 19 is started. At this time, the cutting site by the flame is shown in the form of New Year. In FIG. 7C, gas and oxygen are supplied through the gas and oxygen nozzles 36 and 37 to perform cutting over the entire width of the cutting head 20. 7 (d) shows a state in which the slab cutting surface is enlarged as the cart 16 moves to the left side of the drawing from the position of FIG. 7 (c).

Hereinafter, with reference to FIGS. 8 and 9, a method of grinding according to the shape of surface defects distributed on the surface of the slab will be described.

8 (a) and 9 (a) show a slab free of surface defects from the tip to the end, in which case no machining is required.

8 (b) and 8 (d) show a case where a large number of surface defects 50, 51 occur at the tip of the slab. In this case, preheat the edges of the slab to increase the cutting efficiency and then perform the grinding operation. At this time, the working part is marked with a hatch.

8 (c), 8 (e) and 9 (e) show the case where a plurality of surface defects 50 and 51 occur from the front end to the end of the slab. In this case too, the edges of the slab are preheated and then subjected to the grinding operation.

FIG. 9B shows a state in which the grinding operation is performed using the spray nozzle 32 when the surface defects 50 and 51 occur sporadically.

9 (c) and 9 (d) show a state in which the grinding operation is performed by using the spray nozzle 32 when the surface defects 50 and 51 occur at the front and the end.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art may vary the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be appreciated that modifications and variations can be made.

As described above, according to the present invention, it is possible to check the surface condition of the slab before and after the grinding operation and to easily remove the surface defects of the slab by using a spray mechanism and a plurality of oxygen / gas nozzles to ensure good surface quality of the slab. Can be. It is also possible to reduce the cost and increase the slab yield by performing the grinding operation only on the surface where the surface defects of the slab have occurred. In addition to reducing labor and improving productivity compared to manual labor, the risk of safety accidents can be greatly reduced.

Claims (5)

In the device for automatically grinding the defects on the surface of the slab, A transport unit configured to load the slab to be machined 19 onto the trolley 16 and to transport the slab 19 horizontally; A cutting portion disposed above the conveying portion so as to cut an upper surface of the slab 19 and including at least a pair of oxygen and gas injection mechanisms at a lower end thereof; And And a work monitoring unit disposed on one side of the lower part of the cutting part and including at least one camera C _F and C _R for observing the surface state of the slab 19 and at least one display device for displaying the surface state. An automatic grinding device for surface defects of a slab. According to claim 1, wherein the cutting portion further comprises a wire feeder 26 is spaced apart from the lower end of the cutting portion at a predetermined distance and coupled to the cutting portion by a support frame, The gas injection mechanism A tubular first injection mechanism (31) disposed between the tip of the cutting portion and the wire feeder (26) for injecting gas and oxygen toward the wire feeder (26); And And a second injection mechanism (36, 37) disposed below the distal end of the cutting portion and including a plurality of oxygen and gas nozzles disposed along the width of the cutting portion to inject gas and oxygen toward the wire feeder (26). Automatic grinding device of the surface defect of the slab. The slab surface automatic scraping device according to claim 1, characterized in that the cutting part is movable in the lateral direction of the slab (19). 2. The apparatus for automatically cutting surface defects of a slab according to claim 1, wherein said cutting part is movable vertically. 2. An apparatus for automatically cutting surface defects of a slab according to claim 1, wherein said cutting part includes a skid (42) on a lower side that slidably contacts an upper surface of said slab (19).