Slag removal device and slag removal method

Abstract

To provide a slag removal apparatus which improves the efficiency in removing scarfing slag generated when slabs are scarfed.SOLUTION: A slag removal apparatus for removing scarfing slag generated when scarfing a slab includes: a jet water nozzle provided with an injection port through which jet water is injected toward the slab; angle range acquiring means for acquiring an angle range of the jet water relative to a surface of the slab; and angle adjusting means for adjusting an injection direction of the jet water injected from the jet water nozzle, on the basis of the angle range acquired by the angle range acquiring means.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a slag removal device for removing the cutting slag generated by scarfing a slab, and a method for removing slag.

Background Art

[0002] Defects and impurities generated on the surface of the slab by the scarfing operation affect the quality of the slab product, so they are melted by combustion gas and oxygen. The cutting slag generated during melting remains on the surface of the slab to become residual slag. The cutting slag and the residual slag are collectively also called cutting slag.

[0003] The cutting slag is blown off by jet water and removed from the slab. However, if the treatment with jet water is insufficient and the cutting slag in a high-temperature state comes into contact with water while remaining on the surface of the slab, there is a risk of trouble such as the generation of water vapor and the influence on the operation of the equipment.

[0004] Conventionally, in order to enhance the treatment with jet water, the height of the jet water nozzle has been adjusted (see Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, even if the height position of the jet water nozzle is adjusted as in Patent Document 1, when jet water is injected from directly sidewise parallel to the surface of the slab, most of the injected jet water may pass above the surface of the slab without contacting it. Further, if the angle of the jet water nozzle with respect to the surface of the slab is too large, it becomes difficult to uniformly bring the jet water into contact with the slab in the width direction of the slab. As a result, there is a problem that the cutting slag on the surface of the slab is not sufficiently removed.

[0007] The present invention has been made in view of the above problems, and an object thereof is to provide a slag removal device and a slag removal method capable of improving the removal efficiency of cutting slag generated by scarfing a slab.

Means for Solving the Problems

[0008] In order to solve the above problems, the present invention has the following features.

[0009] [1] A slag removal device for removing cutting slag generated by scarfing a slab, a jet water nozzle having an injection port for injecting jet water toward the slab, an angle range acquisition means for acquiring an angle range formed by the jet water with respect to the surface of the slab, an angle adjustment means for adjusting the injection direction of the jet water injected from the jet water nozzle based on the angle range acquired by the angle range acquisition means, and a slag removal device having the same. [2] The angle adjustment means includes a lifting part for adjusting the height position of the jet water nozzle, and a rotating part attached to the lifting part for adjusting the axial direction of the jet water nozzle, and the slag removal device according to [1] having the same. [3] The rotating part A trunnion axis extending along a direction perpendicular to the axis of the jet water nozzle, A trunnion support portion that rotatably supports the trunnion axis around the axis, A first gear provided on each of the trunnion axes and having teeth formed along the axis of the trunnion axis, A second gear provided on each of the trunnion support portions and meshing with the first gear, A fixing portion that fixes the meshing positions of the first gear and the second gear, The slag removal device according to [2], which has the above. [4] Having a regulating means for regulating the upward rotation of the jet water nozzle, The slag removal device according to any one of [1] to [3]. [5] The angle range is based on a plurality of elements including the width of the slab, a first distance which is the horizontal distance from the injection port of the jet water nozzle to the slab, a second distance which is the vertical distance from the injection port to the slab, a third distance which is the vertical distance from the lower end to the upper end of the injection port, a first flow rate of the jet water injected from the upper end side of the injection port, a second flow rate of the jet water injected from the lower end side of the injection port, a first arrival time required for the jet water injected at the second flow rate to reach the upper edge portion located on the proximal side of the jet water nozzle of the slab from the upper end side of the injection port, and a second arrival time required for the jet water injected at the first flow rate to fall the vertical distance from the slab to the upper end of the injection port. The slag removal device according to any one of [1] to [4]. [6] The angle range includes an angle θ that satisfies the following formula. The slag removal device according to [5]. t1 = L / (V lower cosθ) H = L tanθ + 1 / 2 · g t1 2 H + D = (V upper sinθ) · t2 + 1 / 2 · g t2 2 L + W = (V upper cosθ) · t2 V upper: The first flow rate V_bottom: Second flow velocity t1: First arrival time t2: Second arrival time W: Width of slab L: First distance H: Second distance D: Third distance [7] A slag removal method for removing the cutting slag generated by scarfing a slab, comprising: an angle range acquisition step of acquiring the angle range formed by the jet water with respect to the surface of the slab; an angle adjustment step of adjusting the axial direction of the injection port of the jet water nozzle based on the angle range acquired in the angle range acquisition step; a removal step of injecting the jet water from the jet water nozzle to remove the cutting slag on the surface of the slab. The slag removal method comprising the above steps. [8] The angle range is set based on a plurality of elements including the width of the slab, a first distance which is the horizontal distance from the injection port of the jet water nozzle to the slab, a second distance which is the vertical distance from the injection port to the slab, a third distance which is the vertical distance from the lower end to the upper end of the injection port, a first flow velocity of the jet water injected from the upper end side of the injection port, a second flow velocity of the jet water injected from the lower end side of the injection port, a first arrival time required for the jet water injected at the second flow velocity to reach the upper edge portion located on the proximal side of the jet water nozzle of the slab from the upper end side of the injection port, and a second arrival time required for the jet water injected at the first flow velocity to fall the vertical distance from the slab to the upper end of the injection port. The slag removal method according to [7]. [9] The angle range includes an angle θ satisfying the following formula. The slag removal method according to [8]. t1 = L / (V_bottom * cosθ) H = L * tanθ + 1 / 2 * g * t1 2 H + D = (V_top * sinθ) * t2 + 1 / 2 * g * t2 2 L + W = (V_up cosθ)·t2 V_up: First flow velocity V_down: Second flow velocity t1: First arrival time t2: Second arrival time W: Width of slab L: First distance H: Second distance D: Third distance

Advantages of the Invention

[0010] According to the slag removal device of the present invention, based on the angle range acquired by the angle range acquisition means, the injection direction of the jet water from the injection port of the jet water nozzle is adjusted. As a result, it becomes possible to apply the jet water to the gouging slag at an appropriate angle. Therefore, it becomes possible to improve the removal efficiency of the gouging slag generated by scarfing the slab.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a scarfing facility 100. As shown in FIG. 1, the scarfing facility 100 includes a scarfing device 20 for scarfing the slab 10, a conveying roll 30 for conveying the slab 10 to the scarfing device 20, and a hood 40 that covers the conveying roll 30 in the vicinity of the scarfing device 20. Further, the scarfing facility 100 includes a jet water device 50 that ejects jet water toward the slab 10.

[0013] As the scarfing device 20, for example, a gas scarfing device that preheats the portion of the slab 10 to be machined with combustion gas and then machines the slab 10 using the oxidation combustion reaction of iron and oxygen can be used.

[0014] The conveying rolls 30 are provided at predetermined intervals along the conveying direction of the slab 10. Each of the conveying rolls 30 is a roller formed in a cylindrical shape. A drive motor 31 for rotating around the axis is connected to each of the conveying rolls 30. The conveying roll 30 conveys the slab 10 in the direction of the arrow in the figure. Each of the conveying rolls 30 may be provided so as to be rotatable including forward rotation and reverse rotation. Incidentally, by controlling the rotation speed of the drive motor 31, the conveying speed of the slab 10 is controlled.

[0015] The hood 40 is a ventilation canopy having a duct (not shown) connected to the outside of the scarfing facility 100. The hood 40 discharges, for example, vapor, water vapor, smoke, odor, etc. generated by machining with the scarfing device 20, ejection of jet water, etc. to the outside of the scarfing facility 100.

[0016] The water jet device 50 is installed near the scarfing device 20. The water jet device 50 has a water jet nozzle 51 that jets water jet. By jetting water jet from the water jet nozzle 51, the cutting slag and the residual slag (hereinafter also referred to as cutting slag) generated when the surface of the slab 10 is cut are blown off. The water jet device 50 functions as a slag removing device that removes the cutting slag generated by scarfing the slab 10.

[0017] Figure 2 shows an overview of the scarfing device 20. As shown in Figure 2, the scarfing device 20 has a torch 21 that ejects cutting gas and a lifting cylinder 22 that moves the torch 21 up and down in the vertical direction. The torch 21 ejects cutting gas, for example, after descending by the lifting cylinder 22 until it contacts the surface of the slab 10. Incidentally, the cutting amount of the slab 10 can be changed according to the structure of the torch 21, the ejection angle of the gas ejected from the torch 21, the ejection amount of the gas, the ratio of the gas to oxygen, the pressure of the gas, etc.

[0018] Figure 3 is a side view of the water jet device 50. As shown in Figure 3, the water jet device 50 has a lifting part 52 that adjusts the height position of the water jet nozzle 51, a rotating part 53 that is attached to the lifting part 52 and adjusts the axial direction of the water jet nozzle 51, and a control part 58 that controls the operation of the water jet device 50. The lifting part 52 and the rotating part 53 function as angle adjusting means for adjusting the ejection direction of the water jet ejected from the water jet nozzle 51.

[0019] The lifting part 52 has a lifting cylinder 52a, a lifting link 52b, and a cam arm 52c that connects the lifting cylinder 52a and the lifting link 52b.

[0020] One end of the lifting cylinder 52a, where a shaft is provided, is connected to the frame 52d, and the other end, where a housing part for the shaft is formed, is connected to the cam arm 52c.

[0021] The cam arm 52c is formed in a plate shape. The cam arm 52c has a rotation shaft pivotally supported by a frame 52d. One end of the cam arm 52c is connected to the lifting cylinder 52a, and the other end is connected to the lifting link 52b.

[0022] The lifting link 52b has a leg portion 52e to which the cam arm 52c is connected and a top plate portion 52f that connects the tip side of the leg portion 52e. A jet water nozzle 51 is placed on the top plate portion 52f.

[0023] In this way, the jet water nozzle 51 is supported by the lifting cylinder 52a and the lifting link 52b. When the lifting cylinder 52a expands and contracts, the lifting link 52b is displaced via the cam arm 52c and moves in the vertical direction.

[0024] The rotating portion 53 has a trunnion shaft 53a extending along a direction perpendicular to the axis AX of the jet water nozzle 51 and a trunnion support portion 53b that rotatably supports the trunnion shaft 53a around its axis.

[0025] The trunnion shaft 53a is formed in a cylindrical shape. Each of the trunnion shafts 53a is provided with a first gear 53c having teeth formed along its axis.

[0026] The trunnion support portion 53b is a columnar member extending in a direction perpendicular to the surface of the top plate portion 52f. The trunnion support portion 53b has a second gear 53d that meshes with the first gear 53c on its tip side.

[0027] The rotating portion 53 has a screw jack 53e as a fixing portion that fixes the meshing positions of the first gear 53c and the second gear 53d. In this embodiment, the screw jack 53e fixes the second gear 53d at a predetermined position by fitting with the second gear 53d.

[0028] In addition, the jet water device 50 has a pressing cylinder 54 as a regulating means for restricting the upward rotation of the jet water nozzle 51. One end of the pressing cylinder 54 where the shaft is disposed is fixed to the tip side of the jet water nozzle 51. The other end side of the pressing cylinder 54 having a housing portion for housing the shaft is fixed to a predetermined position (not shown) of the frame. Therefore, when the jet water nozzle 51 ejects jet water, the pressing cylinder 54 presses the jet water nozzle 51 downward with a constant load. That is, by the pressing cylinder 54 pressing the jet water nozzle 51, the action of the reaction force due to the ejection of the jet water can be suppressed.

[0029] FIG. 4 is a front view of the jet water nozzle 51. As shown in FIG. 4, an injection port 55 is formed in the center of the jet water nozzle 51. The injection port 55 is formed to open in a circular shape when viewed from the front. The injection port 55 has a third distance D which is the vertical distance from its lowest point to its highest point. Further, the injection port 55 has an upper opening region OP1 and a lower opening region OP2.

[0030] The upper opening region OP1 is the region of the injection port 55 located on the upper side from the midpoint of the third distance D. The upper opening region OP1 mainly ejects jet water into the distal region of the slab 10 as viewed from the jet water device 50.

[0031] The lower opening region OP2 is the region of the injection port 55 located on the lower side from the midpoint of the third distance D. The lower opening region OP2 mainly ejects jet water into the proximal region of the slab 10 as viewed from the jet water device 50.

[0032] FIG. 5 shows the functional block of the jet water device 50. The jet water device 50 has an angle adjusting means 57 for adjusting the injection direction of the jet water ejected from the jet water nozzle 51 based on the angle range acquired by the angle range acquisition means 58a.

[0033] The angle adjustment means 57 includes a lifting part 52 that adjusts the height position of the above-described jet water nozzle 51, and a rotating part 53 that is attached to the lifting part 52 and adjusts the axial direction of the jet water nozzle 51.

[0034] The control unit 58 has a setting information database (hereinafter also referred to as a database as DB) 56 that stores information for setting the angle of the jet water nozzle 51 with respect to the slab 10.

[0035] The setting information DB 56 includes, for example, the width of the slab 10 introduced into the scarfing facility 100, a first distance that is the horizontal distance from the injection port 55 of the jet water nozzle 51 to the slab 10, a second distance that is the vertical distance from the injection port 55 to the slab 10, a third distance that is the vertical distance from the lower end to the upper end of the injection port 55, a first flow rate of the jet water injected from the upper end side (upper opening region OP1) of the injection port 55, a second flow rate of the jet water injected from the lower end side (lower opening region OP2) of the injection port 55, and the jet water injected at the second flow rate from the lower end side The first arrival time required for the jet water to reach the end face located on the jet water nozzle 51 side of the slab 10 from the injection port 55, the second arrival time required for the jet water injected at the first flow rate to fall the vertical distance from the slab 10 to the upper end of the injection port 55, and a plurality of other elements are stored. The setting information DB 56 stores an angle range formed by the jet water with respect to the surface of the slab 10, which is set based on these plurality of elements.

[0036] The control unit 58 has an angle range acquisition means 58a that acquires the angle range stored in the setting information DB 56. The angle range acquisition means 58a transmits the acquired angle range to the angle adjustment means 57 and adjusts the posture of the jet water nozzle 51 to the angle range. The control unit 58 has an injection control means 58b that controls the switching of the injection and stop of the jet water ejected from the jet water nozzle 51 and the water pressure of the jet water.

[0037] FIG. 6 shows the processing flow of the slag removal method. As shown in FIG. 6, for the slag removal method, an angular range of the jet water sprayed from the jet water nozzle 51 with respect to the surface of the slab 10 is set (step S01). The set angular range is stored in the setting information DB56.

[0038] The angular range acquisition means 58a acquires the angular range by reading it from the setting information DB56 (step S02). The angular range acquisition means 58a transmits the angular range acquired in the angular range acquisition step of step S02 to the angle adjustment means 57.

[0039] When receiving the angular range, the angle adjustment means 57 adjusts the posture of the jet water nozzle 51 to the angular range by adjusting the elevating part 52 and the rotating part 53 (step S03).

[0040] The angular range adjustment step of step S03 is performed before the slab 10 arrives at the scarfing device 20 and the cutting starts.

[0041] First, the adjustment of the posture of the jet water nozzle 51 is carried out in the height direction. The adjustment in the height direction is set so that the jet water nozzle 51 is located at the upper edge portion located on the proximal side of the jet water nozzle 51 of the slab 10. The height adjustment of the jet water nozzle 51 is performed by the cooperation of the elevating cylinder 52a and the elevating link 52b. Specifically, data on the height position of the jet water nozzle 51 corresponding to the operation of the elevating cylinder 52a is stored in the setting information DB56. The angle adjustment means 57 adjusts the height direction of the jet water nozzle 51 by referring to the data and operating each part.

[0042] Next, the angle of the jet water nozzle 51 is adjusted by the rotating part 53. Specifically, data on the angle of the jet water nozzle 51 corresponding to the rotation of the first gear 53c and the second gear 53d is stored in the setting information DB56. The angle adjustment means 57 adjusts the angle of the jet water nozzle 51 by referring to the data and operating each part.

[0043] When the angle range adjustment process in step S03 ends, the injection control means 58b causes the jet water nozzle 51 to eject jet water to remove the cutting slag on the surface of the slab 10 (step S04).

[0044] In the angle range setting process of step S01, for example, the width of the slab 10 introduced into the scarfing facility 100, the first distance which is the horizontal distance from the injection port 55 of the jet water nozzle 51 to the slab 10, the second distance which is the vertical distance from the injection port 55 to the slab 10, the third distance which is the vertical distance from the lower end to the upper end of the injection port 55, the first flow rate of the jet water ejected from the upper end side of the injection port 55, the second flow rate of the jet water ejected from the lower end side of the injection port 55, the first arrival time required for the jet water ejected at the second flow rate to reach the end face located on the jet water nozzle 51 side of the slab 10 from the side of the injection port 55, the second arrival time required for the jet water ejected at the first flow rate to fall the vertical distance from the slab 10 to the upper end of the injection port 55, etc. are set based on a plurality of elements. lower end Specifically, the angle θ is determined so as to satisfy the following formulas (1) to (4). The setting of the angle θ may be performed by the angle range acquisition means 58a. Also, the setting of the angle θ may be performed in advance by, for example, a server device or the like other than the slab removal device and stored in the setting information DB56.

[0045] Specifically, the angle θ is determined so as to satisfy the following formulas (1) to (4). The setting of the angle θ may be performed by the angle range acquisition means 58a. Also, the setting of the angle θ may be performed in advance by, for example, a server device or the like other than the slab removal device and stored in the setting information DB56. t1 = L / Vlower cosθ (1) H = Ltanθ + 1 / 2 · gt1 2 (2) H + D = (Vupper sinθ) · t2 + 1 / 2 · gt2 2 (3) L + W = (Vupper cosθ) · t2 (4)

[0046] Figure 7 is an explanatory diagram showing the parameters used in formulas (1) to (4) in a figure. As also shown in Figure 7, the parameters of each formula are as follows. Vupper: The first flow rate Vlower: The second flow rate t1: First arrival time t2: Second arrival time W: Width of slab 10 (varies for each slab 10 to be handled) L: First distance H: Second distance D: Third distance

[0047] Furthermore, the first flow velocity Vup and the second flow velocity Vdown can be measured by a flow meter (not shown) provided in the jet water nozzle 51. The first arrival time t1 and the second arrival time t2 can be calculated using the first flow velocity Vup, the second flow velocity Vdown, the first distance L, the second distance H, and the third distance D.

[0048] FIG. 8 is a graph showing the relationship between the angle formed by the jet water nozzle 51 with respect to the surface of the slab 10 and the ratio of the water contacting the slab 10. As shown in FIG. 8, the angle θ conforming to the above formula is represented by a dotted line on the graph. In the graph of FIG. 8, at an angle θ of 1.5 degrees, the ratio of the water contacting the slab 10 becomes 100%.

[0049] Using the relationship between the dotted line and the graph of the ratio of the water contacting the slab 10 and the angle determined by the width of the slab 10, etc., an angular range corresponding to a predetermined ratio of the water contacting the slab 10 is derived. The graph of the ratio of the water contacting the slab 10 and the angle determined by the width of the slab 10, etc., can be obtained, for example, by conducting experiments using a model made to resemble the slab 10. For example, an angular range where the ratio of the water contacting the slab 10 is 50 - 100% can be set as the predetermined angular range. In the example shown in FIG. 8, the predetermined angular range can be approximately 0.8 - 1.5 degrees. Thus, the ratio of the water contacting the slab 10 varies according to the angle formed by the jet water nozzle 51 with respect to the surface of the slab 10. By adjusting the angle to a range where the ratio of the water contacting the slab 10 increases and injecting the jet water, it becomes possible to increase the removal efficiency of the melting slag.

[0050] However, when the nozzle angle in the figure exceeds 1.5 degrees, the jet water tends not to hit the back side of the slab 10 (the distal side as viewed from the jet water nozzle 51). Further, when the ratio of the jet water contacting the slab 10 is less than 50%, the removal efficiency of the cutting slag decreases, and there is an increasing tendency for problems such as the generation of water vapor and the influence on the operation of the equipment to occur.

[0051] Incidentally, the setting of the angle range may be performed by the angle range acquisition means 58a and stored in the setting information DB 56. Further, the setting of the angle θ may be performed in advance by, for example, a server device or the like other than the slab removal device and stored in the setting information DB 56.

[0052] FIG. 9 is a graph showing the relationship between the angle formed by the jet water nozzle 51 with respect to the surface of the slab 10 and the ratio of the water contacting the slab 10 for each width of the slab 10. As shown in FIG. 9, when the width of the slab 10 is 650 mm, the angle at which the ratio of the water contacting the slab 10 becomes 100% is 4.5 degrees. When the width of the slab 10 is 1100 mm, the angle at which the ratio of the water contacting the slab 10 becomes 100% is 2.5 degrees. When the width of the slab 10 is 1700 mm, the angle at which the ratio of the water contacting the slab 10 becomes 100% is 1.5 degrees. Thus, as the width of the slab 10 increases, the angle at which the ratio of the water contacting the slab 10 becomes 100% tends to decrease. Further, the desirable angle formed by the jet water nozzle 51 with respect to the surface of the slab 10 is different for each width of the slab 10.

[0053] FIG. 10 shows the mode in which the jet water is sprayed when the angle formed by the jet water nozzle 51 with respect to the surface of the slab 10 is appropriate. As shown in FIG. 10, when the angle formed by the jet water nozzle 51 with respect to the surface of the slab 10 is appropriate, the jet water contacts uniformly in the width direction of the slab 10. Thus, by appropriately adjusting the angle formed by the jet water nozzle 51 with respect to the surface of the slab 10 and then spraying the jet water, it becomes possible to efficiently remove the cutting slag.

[0054] By adjusting the angle so that the ratio of water in contact with the slab 10 increases, the removal efficiency of the cutting slag including the cutting burrs and residual burrs can be enhanced. By adjusting the angle of the jet water nozzle 51 using the angle range including the angle θ obtained as described above and jetting the jet water, the cutting slag on the surface of the slab 10 can be efficiently removed.

[0055] As described above, according to the slab scarfing facility of the present invention, there is an angle adjusting means 57 for adjusting the injection direction of the jet water injected from the jet water nozzle 51 based on the angle range acquired by the angle range acquisition means 58a. Thereby, the jet water can be jetted at an appropriate angle.

[0056] Specifically, the height direction of the jet water nozzle 51 can be adjusted by the elevating part 52 of the angle adjusting means 57, and the angle in the direction of the axis AX of the jet water nozzle 51 can be adjusted by the rotating part 53. Further, the rotating part 53 has a trunnion shaft 53a and a trunnion support part 53b, whereby the jet water nozzle 51 can be freely rotated.

[0057] The rotating part 53 has a screw jack 53e as a fixing part for fixing the meshing position of the first gear 53c and the second gear 53d, and a pressing cylinder 54, whereby the injection direction of the jet water injected from the jet water nozzle 51 can be fixed. That is, it is possible to prevent the jet water nozzle 51 from tilting upward due to the reaction force of the jet water.

[0058] In this way, by adjusting the angle of the jet water nozzle 51 to an appropriate predetermined angle, it becomes possible to appropriately remove the cutting slag on the surface of the slab 10 by the jet water jetted from the jet water nozzle 51.

[0059] Further, in the present embodiment, the rotating part 53 is composed of a trunnion shaft 53a, a trunnion support part 53b, a first gear 53c, a second gear 53d, and a screw jack 53e. The rotating part 53 may be composed of members other than these. For example, the first gear 53c and the second gear 53d may be connected by a connecting means such as a chain or a belt. Further, a rail formed along the rotation locus of the jet water nozzle 51 and a fitting member that fits with the rail may be provided on the jet water nozzle 51, and the fitting member may be fixed at a predetermined position on the rail.

[0060] Also, in the present embodiment, the angular range formed by the jet water with respect to the surface of the slab 10 is set based on a plurality of elements including the width W of the slab, the first distance L, the second distance H, the third distance D, the first flow velocity V upper, the second flow velocity V lower, the first arrival time t1, and the second arrival time t2, and is set to include an angle θ that satisfies equations (1) to (4). The angular range is not limited to that obtained in such a manner. The angular range may be obtained, for example, by injecting jet water into a model assuming the slab 10 and using the obtained measured values.

[0061] Furthermore, the setting information DB 56 may be provided in, for example, a server device or the like other than the slab removing device.

Example

[0062] When removing the melting slag with jet water in the slab scarfing facility, the influence of the angle formed by the jet water with respect to the slab was investigated. Specifically, before the second semester of 2018, the angle formed by the jet water with respect to the slab was set to 0 degrees. Since the first semester of 2019, an angular range set from an angle that satisfies any of the above equations (1) to (4) has been obtained as the angle formed by the jet water with respect to the slab, and the angle θ within the angular range has been used. Specifically, after the first semester of 2019, it was performed using each parameter described in Table 1.

[0063]

Table 1

[0064] Figure 11 is a graph showing the tendency of troubles caused by steam. As shown in Figure 11, after the first half of 2019, the occurrence of troubles caused by steam decreased sharply compared to before the second half of 2018. As a result, the time affected by equipment troubles per month could be reduced to 80% or less of that in the second half of 2018.

Explanation of Signs

[0065] 100 Slab scarfing equipment 10 Slab 20 Scarfing device 30 Conveyor roll 50 Jet water device 51 Jet water nozzle 52 Lifting part 53 Rotating part 54 Pressing cylinder 55 Injection port 56 Setting information DB 57 Angle adjustment means 58a Angle range acquisition means AX Axis of the jet water nozzle

Claims

1. A slag removal device for removing the cutting slag generated by scarfing a slab, comprising: a jet water nozzle formed with a jet opening for jetting jet water toward the slab; an angle range acquisition means for acquiring an angle range formed by the jet water with respect to the surface of the slab; an angle adjustment means for adjusting the jet direction of the jet water jetted from the jet water nozzle based on the angle range acquired by the angle range acquisition means; The slag removal device having the above.

2. The angle adjustment means includes: a lifting part for adjusting the height position of the jet water nozzle; a rotating part attached to the lifting part for adjusting the axial direction of the jet water nozzle; The slag removal device according to claim 1, having the above.

3. The rotating part includes: a trunnion shaft extending along a direction perpendicular to the axis of the jet water nozzle; a trunnion support part for rotatably supporting the trunnion shaft around the axis; a first gear provided on each of the trunnion shafts and having teeth formed along the axis of the trunnion shaft; a second gear provided on each of the trunnion support parts and meshing with the first gear; a fixing part for fixing the meshing positions of the first gear and the second gear; The slag removal device according to claim 2, having the above.

4. The slag removal device according to any one of claims 1 to 3, having a restricting means for restricting the upward rotation of the jet water nozzle. The slag removal device according to any one of claims 1 to 3, having the above.

5. The angle range is set based on a plurality of elements including the width of the slab, a first distance in the horizontal direction from the jet opening of the jet water nozzle to the slab, a second distance in the vertical direction from the jet opening to the slab, a third distance in the vertical direction from the lower end to the upper end of the jet opening, a first flow rate of the jet water jetted from the upper end side of the jet opening, a second flow rate of the jet water jetted from the lower end side of the jet opening, a first arrival time required for the jet water jetted at the second flow rate to reach the upper edge portion located on the proximal side of the jet water nozzle of the slab from the lower end side of the jet opening, and a second arrival time required for the jet water jetted at the first flow rate to fall the vertical distance from the slab to the upper end of the jet opening. The slag removal device according to any one of claims 1 to 3, having the above.

6. The slag removal device according to claim 5, wherein the angle range includes an angle θ satisfying the following formula. t1 = L / (V_down * cosθ) H = Ltanθ + 1 / 2·gt1 2 H + D = (V_up sinθ)・t2 + 1 / 2・gt2 2 L + W = (V_up * cosθ) * t2 V_up: The first flow velocity V_down: The second flow velocity t1: The first arrival time t2: The second arrival time W: The width of the slab L: The first distance H: The second distance D: The third distance

7. The angle range is based on a plurality of elements including the width of the slab, the first distance which is the horizontal distance from the injection port of the jet water nozzle to the slab, the second distance which is the vertical distance from the injection port to the slab, the third distance which is the vertical distance from the lower end to the upper end of the injection port, the first flow velocity of the jet water injected from the upper end side of the injection port, the second flow velocity of the jet water injected from the lower end side of the injection port, the first arrival time required for the jet water injected at the second flow velocity to reach the upper edge portion located on the proximal side of the jet water nozzle of the slab from the lower end side of the injection port, and the second arrival time required for the jet water injected at the first flow velocity to fall the vertical distance from the slab to the upper end of the injection port. The slag removal device according to claim 4

8. The angle range includes an angle θ that satisfies the following formula. The slag removal device according to claim 7 t1 = L / (V_down * cosθ) H = L tanθ + 1 / 2 · gt1 2 H + D = (V_up sinθ)・t2 + 1 / 2・gt2 2 L + W = (V_up * cosθ) * t2 V_up: The first flow velocity V_down: The second flow velocity t1: The first arrival time t2: The second arrival time W: The width of the slab L: The first distance H: The second distance D: The third distance

9. A slag removal method for removing the cutting slag generated by scarfing the slab, comprising An angle range acquisition step of acquiring the angle range formed by the jet water with respect to the surface of the slab An angle adjustment step of adjusting the axial direction of the injection port of the jet water nozzle based on the angle range acquired in the angle range acquisition step A removal step of injecting the jet water from the jet water nozzle to remove the cutting slag on the surface of the slab The slag removal method including the above steps

10. The angle range is set based on a plurality of elements including the width of the slab, a first distance which is the horizontal distance from the injection port of the jet water nozzle to the slab, a second distance which is the vertical distance from the injection port to the slab, a third distance which is the vertical distance from the lower end to the upper end of the injection port, a first flow rate of the jet water injected from the upper end side of the injection port, a second flow rate of the jet water injected from the lower end side of the injection port, a first arrival time required for the jet water injected at the second flow rate to reach the upper edge portion located on the proximal side of the jet water nozzle of the slab from the lower end side of the injection port, and a second arrival time required for the jet water injected at the first flow rate to fall the vertical distance from the slab to the upper end of the injection port. The method for removing slag according to claim 9.

11. The angle range includes an angle θ that satisfies the following formula. The method for removing slag according to claim 10. t1 = L / (V lower cosθ) H = Ltanθ + 1 / 2 · gt1 2 H + D = (V_up sinθ)・t2 + 1 / 2・gt2 2 L + W = (V upper cosθ) · t2 V upper: The first flow rate V lower: The second flow rate t1: The first arrival time t2: The second arrival time W: The width of the slab L: The first distance H: The second distance D: The third distance

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