WO2015064695A1 - 溶融金属めっき炉、めっき製品の製造方法及び製造システム及び当該製造方法によって得られた金属めっき鋼管 - Google Patents
溶融金属めっき炉、めっき製品の製造方法及び製造システム及び当該製造方法によって得られた金属めっき鋼管 Download PDFInfo
- Publication number
- WO2015064695A1 WO2015064695A1 PCT/JP2014/078907 JP2014078907W WO2015064695A1 WO 2015064695 A1 WO2015064695 A1 WO 2015064695A1 JP 2014078907 W JP2014078907 W JP 2014078907W WO 2015064695 A1 WO2015064695 A1 WO 2015064695A1
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- WIPO (PCT)
- Prior art keywords
- molten metal
- combustion chamber
- plating
- heating device
- opening
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
- C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/20—Arrangements of heating devices
Definitions
- the present invention relates to a molten metal plating furnace, and more particularly to a molten metal plating furnace that can reduce the variation in the temperature of the molten metal in the plating bath and reduce the amount of gas used. Furthermore, the present invention relates to a metal plating product manufacturing system and manufacturing method capable of improving work efficiency and plating quality incorporating the molten metal plating furnace.
- the molten metal plating furnace is used for immersing a metal plating object in a molten metal stored in a plating bath and performing a plating process.
- a zinc wall galvanized bath having a double wall structure composed of an inner wall and an outer wall, the inner wall being heated by a burner attached to the outer wall at an interval, and stored in the plating bath inside the inner wall.
- a zinc hot dipping bath that keeps zinc in a molten state is known (see Patent Document 1).
- a hot dip galvanizing furnace that heats a plating bath with a combustion gas swirling in one direction in a combustion chamber of a hot dip galvanizing furnace, and is opposed to one end of a short wall portion and a portion located diagonally thereto.
- a hot dip galvanizing furnace is disclosed in which a high-speed burner is provided at an intermediate position between two long wall portions (see Patent Document 2).
- the combustion gas ejected from the high-speed burner swirls in the combustion chamber in one direction and becomes convection heat transfer heating, so that variations in temperature in the plating bath can be suppressed to some extent,
- the internal temperature can be made lower than that of conventional plating furnaces, however, this combustion gas becomes a flame and is injected from the flame outlet into the combustion chamber to heat the molten zinc. Needs to be at a high temperature, and therefore the progress of corrosion in the furnace cannot be suppressed. Furthermore, a large amount of gas was required to bring the furnace to a high temperature state.
- the present inventors melt the metal without increasing the temperature of the jet gas itself as in the prior art.
- the present inventors have found that the temperature distribution of the molten metal can be made uniform and the gas consumption can be suppressed.
- the present inventors have found that the work efficiency of the system and the quality of plating can be improved by appropriately incorporating the molten metal furnace into a metal plating product manufacturing system, and the present invention has been completed.
- the molten metal plating furnace of the present invention includes a plating bath, an inner wall disposed outside the plating bath, a substantially rectangular heat-resistant outer wall, and a heating chamber surrounded by the inner wall and the heat-resistant outer wall.
- a molten metal plating furnace provided with a heating device in at least one place of the heat-resistant outer wall,
- the heating device is A combustion chamber (12) that extends in an orderly manner about a central axis (14), wherein at least part of the axially extending walls (26, 64, 66) of the combustion chamber (12),
- An array (22) of fuel fill openings (28.1) and an array of air fill openings (28.2) facing to discharge fuel and air to a common combustion zone along the combustion chamber (12) (24) is formed, and the size of the fuel filling opening (28.1) is suitable for achieving an effective combustion reaction with respect to the size of the air filling opening (28.2).
- both aperture arrays (30, 44, 46, 48, 58, 68, 70, 76) can be controllably adjusted and, if the size of both aperture arrays is adjustable, they are independent of each other. It is a molten metal plating furnace characterized by being a heating device that can be adjusted.
- the production system of the metal plating product of the present invention includes: Having at least one plating execution part for applying molten metal plating to the object to be plated; At least one of the plating implementation units has a plating bath and a heating device for heating the plating bath,
- the heating device is A combustion chamber (12) that extends in an orderly manner about a central axis (14), wherein at least part of the axially extending walls (26, 64, 66) of the combustion chamber (12), An array (22) of fuel fill openings (28.1) and an array of air fill openings (28.2) facing to discharge fuel and air to a common combustion zone along the combustion chamber (12) (24) is formed, and the size of the fuel filling opening (28.1) is suitable for achieving an effective combustion reaction with respect to the size of the air filling opening (28.2).
- both aperture arrays (30, 44, 46, 48, 58, 68, 70, 76) can be controllably adjusted and, if the size of both aperture arrays is adjustable, they are independent of each other. It is a system characterized by being a heating device that can be adjusted.
- the metal plating product manufacturing system of the present invention is surrounded by a plating bath, an inner wall disposed outside the plating bath, a substantially rectangular heat-resistant outer wall, and the inner wall and the heat-resistant outer wall.
- a manufacturing system of a metal plating product having a heating chamber, and having a molten metal plating furnace provided with a heating device in at least one place of the heat-resistant outer wall;
- the heating device is A combustion chamber (12) that extends in an orderly manner about a central axis (14), wherein at least part of the axially extending walls (26, 64, 66) of the combustion chamber (12),
- An array (22) of fuel fill openings (28.1) and an array of air fill openings (28.2) facing to discharge fuel and air to a common combustion zone along the combustion chamber (12) (24) is formed, and the size of the fuel filling opening (28.1) is suitable for achieving an effective combustion reaction with respect to the size of the air filling opening (28.2).
- the system may be a heating device that can be adjusted.
- the individual openings (28) of the array (22, 24) in the heating device are at least centered on the central axis (40) of the air-filled opening (28.2). 14) at the longitudinal center (14, 42) of the combustion chamber (12) that coincides with 14) and intersects the central axis (38) of the corresponding fuel filling opening (28.1). Also good.
- Each of the medium filling opening arrays (22, 24) in the heating device may have the same number of openings (28).
- the openings (28) of the array (22, 24) in the heating device may be located at regular intervals.
- the openings (28) of the array (22, 24) in the heating device may be spaced apart in rows and columns.
- the central axes (38, 40) of all the openings (28) are discharged at the same angle with respect to the longitudinal center (14, 42) of the combustion chamber (12). It may be tilted in the direction.
- the adjustment mechanism (30, 44, 46, 48, 58, 68, 70, 76) in the heating device is adapted to cover means (30) for the at least one adjustable medium filling opening array (22, 24).
- the cover means is formed with cover means opening arrays (32, 72, 74) that coincide with the medium filling opening arrays (22, 24),
- the cover means opening array is at least open in response to a relative translation of the cover means that are positioned closely to each other and the wall (26, 64, 66) of the combustion chamber (12) presenting the medium filling array.
- the flow of the medium to the combustion chamber is adjusted during use of the heating device by cooperating in an adjustable manner between an alignment state where the portion is enlarged and an alignment state where the opening is narrowed. Also good.
- the combustion chamber (12) in the heating device may be configured to face the media filling opening array (22, 24) against each other.
- the combustion chamber (12) in the heating device is formed in an annular shape around the medium filling chamber ( ⁇ ) extending in the center along the central axis (14), whereby the longitudinal center of the combustion chamber (12) is formed. (42) extends annularly through the center in the combustion chamber (12), so that the array of media filling openings (22, 24) faces opposite circumferential walls (26) defining the longitudinal inner and outer side walls of the combustion chamber. .1, 26.2), and the inner end of the medium filling chamber ( ⁇ ) may be appropriately closed.
- the opening size of the at least one medium filling array (22, 24) is set to the outer wall (26.2) extending inwardly or longitudinally of the medium filling chamber ( ⁇ ) and surrounding the combustion chamber.
- the cover main body (44, 58) may be attached so as to be controllably displaceable in the direction of the central axis (14) of the heating device.
- both media filling aperture arrays (22, 24) may be adjustable by a cover body (44, 58) having a cylindrical opening.
- One of the fuel supply unit (20) and the air supply unit (18) in the heating device extends inside the longitudinal wall (26.1) of the combustion chamber, and the other wall extends outside the combustion chamber.
- the fuel filling chamber (20) in the heating device is located inside the combustion chamber (12), and the air filling chamber (18) is located along the outside of the combustion chamber (12). Good.
- the combustion chamber (12) whose inner end is appropriately closed extends along the central axis (14) and defines a longitudinal center (42);
- the adjustment mechanism (30, 44, 68, 70, 76) adjustably cooperates with at least one medium filling opening array (22, 24) to open the opening size of the at least one medium filling opening array If it is in the form of cover means for adjusting the pressure, it may be slidably mounted on the outer surface of a suitable longitudinal wall (26, 64, 66) of the combustion chamber (12). Even if the fuel supply unit (20) and the air supply unit (18) in the heating device are in the form of a filling chamber that can be appropriately replenished along the side walls (64, 66) of the combustion chamber. Good.
- the combustion chamber (12) in the heating device may be formed of a flat sidewall having a medium filling opening (28) formed at least in part. At least one cover plate with an opening attached so that the cover means (30, 68, 70) in the heating device can be displaced between the stoppers in the direction of the central axis (14) of the combustion chamber. 68, 70).
- the combustion chamber (12) in the heating device may have a rectangular shape.
- a medium filling opening (28) is formed on the two opposite side walls (68, 70) of the combustion chamber, that is, an air filling opening is formed on one side, and a fuel filling opening is formed on the other side. It may be.
- both the air filling opening array (24) and the fuel filling opening array (22) can be adjusted by cover plates (68, 70) with appropriate openings. Also good.
- the metal plated product may be a metal plated steel pipe.
- the manufacturing system includes: A steel pipe manufacturing system for manufacturing a steel pipe in which molten metal plating is applied to either the inner or outer surface or one of the surfaces in a continuous production line from a steel strip, An inner surface plating execution unit that applies molten metal plating by pouring molten metal on the upper side of the steel strip corresponding to the inner surface of the steel pipe; A steel pipe forming portion for continuously cold-forming the steel strip subjected to inner plating and forming a continuous steel pipe by seam welding a longitudinal end surface joint portion of the steel strip formed on the steel pipe; and The outer surface of the steel pipe is immersed in molten metal and subjected to molten metal plating, and an outer surface plating execution unit,
- the steel pipe plating system may be characterized in that the inner plating section and / or the outer plating section includes the plating bath and the heating device for heating the plating bath.
- the system is A steel pipe manufacturing system for manufacturing a steel pipe having at least an inner surface subjected to molten metal plating in a continuous production line from a steel strip, An inner surface plating execution unit that applies molten metal plating by pouring molten metal on the upper side of the steel strip corresponding to the inner surface of the steel pipe; A steel pipe forming section for continuously cold-forming a steel strip subjected to inner surface plating into a tubular shape, and seam-welding a longitudinal end surface joint portion of the steel strip formed on the steel pipe to obtain a continuous steel pipe;
- the inner plating portion is A pouring part where molten metal is poured on the upper side of the steel strip, A molten metal supply section capable of supplying molten metal to the pouring section; and An internal wiping portion for removing molten metal poured by the pouring portion,
- the pouring part has moving means that can move in parallel with the traveling direction of the steel strip, The relative distance between the initial position where the molten metal is poured and
- the system also includes: A steel pipe manufacturing system for manufacturing a steel pipe having at least an outer surface subjected to molten metal plating in a continuous production line from a steel strip, A steel pipe forming portion for continuously cold-forming the steel strip into a tubular shape, seam welding the longitudinal end surface joint portion of the steel strip formed on the steel pipe, and obtaining a continuous steel pipe;
- a steel pipe manufacturing system having an outer surface plating execution part, which performs the molten metal plating by immersing the outer surface of the steel pipe in a molten metal
- the outer plating portion is An immersion part for performing a hot dipping process by passing the steel pipe;
- a molten metal supply unit capable of supplying a molten metal to the immersion unit;
- An outer surface wiping portion that removes excess metal from the continuous steel pipe immersed in the molten metal by the immersion portion, and
- the immersion part has moving means that can move parallel to the traveling direction of the steel strip, The relative distance between the initial position immersed in the molten metal and
- the system comprises: A steel pipe manufacturing system for manufacturing a steel pipe whose inner and outer surfaces are subjected to molten metal plating in a continuous production line from a steel strip, An inner surface plating execution unit that applies molten metal plating by pouring molten metal on the upper side of the steel strip corresponding to the inner surface of the steel pipe; A steel pipe forming portion for continuously cold-forming the steel strip subjected to inner plating and forming a continuous steel pipe by seam welding a longitudinal end surface joint portion of the steel strip formed on the steel pipe; and
- the inner plating portion is A pouring part where molten metal is poured on the upper side of the steel strip, A molten metal supply section capable of supplying molten metal to the pouring section; and An internal wiping portion for removing molten metal poured by the pouring portion,
- the pouring part has
- the position of the inner surface wiping portion and / or the outer surface wiping portion may be movable.
- the position of the inner surface wiping portion and / or the outer surface wiping portion may be fixed.
- a plurality of the immersion parts arranged continuously in the traveling direction of the continuous steel pipe The molten metal supply unit may be capable of supplying the molten metal by changing the number of the immersion units that supply the molten metal.
- the outer surface wiping portion is installed immediately after each of the plurality of immersion portions; It may be possible to determine which of the plurality of wiping units to operate.
- the outer surface wiping part installed between the immersion parts, An annular portion surrounding the continuous steel pipe; A plurality of gas ejection holes formed inside the annular portion, It may be a ring-opening movable wiping part that is movable to a position away from the continuous steel pipe when the annular part is opened.
- the present invention may be a method for manufacturing a metal-plated steel pipe, wherein steel pipe plating is formed using any one of the systems described above.
- the temperature variation in the plating bath may be within 20 ° C.
- the present invention is a steel pipe obtained by any one of the above-described methods for producing a metal-plated steel pipe, and may be a metal-plated steel pipe having a metal plating layer thickness of 4 ⁇ m or less.
- the molten metal plating furnace of the present invention is not a heating method in which a flame is released into a space between an iron kettle and a molten metal bath and heated by heat conduction like a conventional burner, that is, a fuel or the like Since the kinetic energy is given by injecting the molecules generated by the combustion of this material, and the molecules that hold this kinetic energy collide and vibrate, they are converted to heat energy and heated, so heat conduction Also, the transmission speed is fast and the control temperature is easy to control over a wide range. Moreover, since the molten metal can be heated uniformly, uniform plating quality can be realized.
- FIG. 1 It is the schematic which shows one Embodiment of the molten metal plating furnace of this invention, (a) of FIG. 1 is the top view, (b) of FIG. 1 is cutting line I (b) in (a) of FIG. ) -I (b) is a front sectional view (as viewed from the front side toward the rear side), and FIG. 1 (c) is a section line I (c)-in FIG. It is sectional drawing of the right side surface along I (c).
- FIG. 1 It is a schematic perspective view which shows one Embodiment of the heating apparatus (combustion apparatus) applied to the molten metal plating furnace of this invention. It is the side view which looked at the heating apparatus of FIG. 2 from the direction of arrow B of FIG. FIG.
- FIG. 3 is a cross-sectional view of the heating device of FIG. 2 along the section line AA of FIG. It is sectional drawing which showed another embodiment of the heating apparatus typically. It is a side view which shows the state which looked at the heating device of Drawing 5 from the left direction.
- FIG. 5 is a diagram illustrating a typical media fill and cover means opening arrangement formed through the combustion chamber wall of the heating device and an adjustment mechanism used to regulate the fill of the combustion media into the combustion chamber. is there.
- It is a schematic plan view of the molten metal plating furnace used in the Example.
- It is a schematic plan view of the molten metal plating furnace used in the comparative example. It is a graph which shows a temperature distribution measurement result, (a) of FIG.
- FIG. 10 is a graph which shows the measurement result of an Example
- (b) of FIG. 10 is a graph which shows the measurement result of a comparative example. It is a photograph which shows the cross section of a galvanized product.
- FIG. 12A is a schematic view of a conventional molten metal plating furnace
- FIG. 12A is a plan view thereof
- FIG. 12B is a cutting line II (b) -II (b) in FIG.
- FIG. 12C is a cross-sectional view of the right side surface taken along section line II (c) -II (c) in FIG.
- FIG. 13 is a schematic configuration diagram of a hot-dip plated steel pipe manufacturing system according to the best mode.
- FIG. 12A is a schematic view of a conventional molten metal plating furnace
- FIG. 12A is a plan view thereof
- FIG. 12B is a cutting line II (b) -II (b) in FIG.
- FIG. 12C is a cross-section
- FIG. 14 is a schematic configuration diagram of the inner surface molten metal plating apparatus according to the best mode.
- FIG. 15 is a schematic configuration diagram of a pouring portion of the inner surface molten metal plating apparatus according to the best mode.
- FIG. 16 is a schematic configuration diagram of the movable part of the inner surface molten metal plating apparatus according to the best mode.
- FIG. 17 is a schematic configuration diagram of an outer surface molten metal plating apparatus according to the best mode.
- FIG. 18 is a view showing a state of the immersion part and the steel pipe of the outer surface hot dipping apparatus.
- FIG. 19 is a diagram illustrating a schematic configuration of the ring-opening movable wiping unit.
- FIG. 20 is a diagram showing the relationship between the plating rate and the molten metal immersion length.
- the molten metal plating furnace of the present invention has at least a molten metal plating tank surrounded by an inner wall, a heat resistant outer wall, a heating chamber surrounded by the inner wall and the heat resistant outer wall, and a heat source (heating device).
- FIG. 1A is a plan view showing an outline of an embodiment of a molten metal plating furnace of the present invention, and a plating bath 101 for storing molten metal is installed inside the molten metal plating furnace 100.
- a substantially rectangular heat-resistant outer wall 103 composed of a short wall portion and a long wall portion is provided on the outside thereof.
- the wall surface around the outside of the plating bath among the wall surfaces of the plating bath 101 is defined as the inner wall 102.
- the space between the heat resistant outer wall 103 and the inner wall 102 is a heating chamber 104 for heating the plating bath 101, and one heating device is provided near one end of the short wall portion of the heat resistant outer wall 103. 10 is arranged to supply heat energy to the heating chamber 104.
- an exhaust port 105 through which a part of the gas circulated through the heating chamber 104 is exhausted is provided near the center of the short wall portion.
- a lid member can be attached to the upper part of the molten metal plating furnace 100. This lid member shuts off the system inside the metal plating furnace 100 and the system outside the metal plating furnace 100 when the furnace is heated, and fluid conduction from the inside of the metal plating furnace 100 to the outside is impossible. It is a member to be intended.
- the molten metal plating furnace 100 (The heat resistant outer wall 103 and the plating bath 101) may be covered so that the fluid communication between the heating chamber 104 and the inside of the plating bath 101 is impossible (that is, the heating device 10).
- the extracted gas or the like does not enter the plating bath 101 and can be circulated through the heating chamber 104).
- the material of the plating bath is preferably selected as appropriate in relation to the type of molten metal used for metal plating. Moreover, it can select suitably also about the kind of metal with which it uses for plating.
- the heating device (combustion device) 10 used in the present invention will be described below.
- the heating device 10 is preferably a variable opening combustion device in the form of a combustor unit.
- the heating device 10 includes a combustion chamber 12 that extends orderly about a central axis 14 and terminates in a post-combustion medium discharge section that gradually narrows in the form of a discharge nozzle 16, the filling of the combustion chamber 12 is an air-filled chamber. 18 and a combustion medium opening in the form of a fuel filling opening array 22 and an air filling opening array 24 formed in opposing longitudinal walls 26 of the combustion chamber from a fuel supply and air supply in the form of a fuel filling chamber 20.
- the cross-sectional size of the openings 28 of the arrays 22, 24 can be adjusted by an adjustment mechanism, which adjusts the adjustment in cooperation with the media opening arrays 22, 24.
- the cover means opening array 32 to be played is provided with openings formed in a number and size corresponding to the number and size of the respective medium opening arrays 22, 24. It has attached the cover means 30 to be displaceable. Since the size of the media filling opening 28 can be mechanically adjusted by the cover means 30, the upstream media supply becomes insignificant and the unit 10 can be used for a range of media supply pressures. .
- the combustion chamber 12 is exposed to ignition means in the form of a spark plug 34 that is mounted through a real wall 36.
- the nozzle 16 can typically converge at an angle of 21 degrees.
- the individual openings 28.1 of the fuel filling opening array 22 and the openings 28.2 of the air filling opening array 24 are such that the central axis 38 of the fuel filling opening 28.1 is the longitudinal center 42 of the combustion chamber 12. Are inclined at the same forward angle in the direction of the nozzle 16 so as to intersect with the central axis 40 of the corresponding air filling opening 28.2.
- the openings of the opening array 32 also pass along the respective axes 38 and 40 and along the openings of the opening array 32 according to the direction of the openings 28.1 and 28.2. This is causing the occurrence of filling.
- the openings 28 are suitably arranged regularly in rows and columns, as shown in FIG.
- the opening 28.1 of the cover means opening array 32 is, as is conventional, the air filling opening array 24 and the openings of the cover means opening array 32 that are adjustably aligned with the air filling opening array 24. Less than 28.2.
- the combustion chamber 12 is formed in an annular shape, while the fuel filling chamber 20 extends through the interior of the combustion chamber 12.
- An air filling chamber 18 surrounds the combustion chamber 12 in an annular shape.
- the cover means 30 with an opening is formed by a cylindrical cover body 44 with an opening fitted along an inner region formed adjacent to the inner wall 26.1 of the combustion chamber 12. It is a form.
- the body 44 is slidably displaceable in the direction of the central axis 14 via the screw shaft 46 by means of an attached screw shaft that passes in a screw-like manner along an adjustment wheel 48 that can be rotated manually.
- the linear displacement of the main body 44 increases or decreases the degree of alignment of the opening 50 formed in the adjustment cylinder on the fuel side with the fuel filling opening 28.1, and the size of the fuel filling opening 28.1. Has the effect of adjusting.
- a lock screw 52 is attached to the wheel 48 and can be fixed by the lock screw 52 so as not to rotate, and the openings 28.1 and 50 can be locked in a fixed relationship. Fuel is filled into the fuel filling chamber 20 through the supply conduit 54 and the circumferentially distributed inlet openings 56 open to the chamber 20.
- the cover means 30 with an opening is in the form of a cylindrical body 58 outside the combustion chamber formed so as to be located adjacent to the outer wall 26.2 of the combustion chamber.
- An opening 60 is formed in the side adjustment cylinder.
- the body 58 can be linearly displaced in the direction of the axis 14 by pushing and pulling with an independent tool. Supply to the air filling chamber 18 is performed via an air supply unit 59.
- the unit 10 is conveniently fitted with a suitable seal that prevents loss of the filling medium to the environment.
- the unit 10 of this embodiment is naturally surrounded by the housing 62.
- the combustion chamber 12 is in the form of a rectangular region arranged to extend around the central axis 14 of the unit 10 that also forms the center of the combustion chamber 12. .
- a fuel-filled opening array 22 and an air-filled opening array 24 are formed in the back-to-back side walls 64 and 66, respectively.
- Cover means 30 with openings are slidably mounted openings formed with an air filling side adjustment opening array 72 and a fuel filling side adjustment opening array 74 forming an opening array 32 of the cover means, respectively. It is the form of the boards 68 and 70 with a part. The plates 68 and 70 are attached so as to be linearly displaced in the direction of the shaft 14 by the handle 76. Plates 68 and 70 together with handle 76 form the adjustment mechanism of this embodiment.
- the unit 10 of the embodiment of FIGS. 5 and 6 is naturally surrounded by the housing.
- the unit 10 Since the unit 10 operates at a high temperature, it is conventionally manufactured from a heat resistant material such as stainless heat resistant alloy steel.
- the combustion apparatus in the form of the unit 10 is easily manufactured so as to directly replace the conventional unit by retrofitting. Therefore, as shown in FIG. 2, it is possible to simply bolt to the molten metal plating furnace 100 through the hole 78 of the front flange 80.
- the heating effect of the unit 10 is reduced to the fuel side wheel 48 or appropriate plate 70 or air side charge.
- the cylindrical body 58 or plate 68 for filling can be adjusted by simply adjusting the opening array 32 of suitable cover means.
- Acceleration of the flow of combustion gas molecules after combustion by the nozzle 16 suppresses heat loss from the combustion reaction to the position of application of heat, and a desired temperature can be obtained at a lower combustion temperature. While the openings formed in the sidewalls and the manner in which they are arranged have the effect of concentrating the combustion reaction to the center of the combustion chamber and improving the efficiency of the reaction, a suitable media filling is Is easily controlled by changing the cross-sectional area of the cylinder and easily responding to changes in the supply pressure of the combustion medium.
- the advantage of the heating device unit 10 as specifically described is that the filling of the medium into the combustion chamber can be easily controlled, while the configuration of the filling and adjusting opening is the combustion efficiency of the filled medium. It is in the point which improves. Another advantage is seen in the fact that acceleration of gas molecules after combustion by the nozzle reduces heat loss between the combustion device and the object to be heated.
- the fuel gas and air taken into the heating device unit 10 are combusted in a stepwise control system, and the theoretical mixing ratio in the heating device unit 10 is accurately maintained in each of these stages. It allows the fuel gas to burn completely, and achieves low temperature combustion. Therefore, the combustion gas molecules taken out from the heating device unit 10 can be kept at a low thermal energy while being a high-speed gas molecule flow having high kinetic energy.
- FIG. 1 shows the case where there is one heat source (heating device), but two or more heat sources may be installed as necessary.
- the heating method of the new technology is adopted, and the combustion gas molecules ejected from the heating device are low temperature, but are molecules that possess high kinetic energy because of high speed. Even if it is a base, it can convection in the heating chamber in one direction, and the thermal energy converted by the molecules holding kinetic energy colliding with the inner wall of the heating chamber that is the object to be heated and vibrating. Since the molten metal plating bath is heated by this, not only the plating bath but also the temperature in the molten metal plating furnace can be made uniform.
- a heating device that employs such a heating method, that is, a heating method in which molecules are injected using the combustion of a substance, and molecules that possess kinetic energy collide and vibrate to be converted into heat energy and heated.
- Examples of the heating device include TKenergizer (registered trademark) manufactured by Tkenergizer Global Limited.
- the heating system heating apparatus as described above is used as a heat source (heating apparatus). That is, molecules (ex. CO 2 molecules, H 2 O molecules) generated by burning fuel (ex. Hydrocarbon gas) inside the heating device are injected into the heating chamber between the inner wall and the heat-resistant outer wall. , Using a heating device that converts kinetic energy into thermal energy by collision and vibration. Since such a heating device is heating using molecular vibration, the transmission speed is faster than heat conduction.
- the transmission speed in the case of the present invention is as follows. Compared to the transmission speed of a normal gas burner or the like that penetrates heat from the surface by heat conduction, it is about three times faster.
- the present invention since it is converted into thermal energy, it becomes possible to control the temperature almost in accordance with the required control temperature.
- the initial collision vibration energy is converted into thermal energy, and the inside of the furnace, including the object to be heated (ex.
- collision vibration energy is added one after another, the inside of the furnace quickly rises to the set temperature, and uniform heating in the furnace can be realized. Therefore, in a metal plating furnace equipped with such a heating device, the generation of dross can be suppressed, the life of the kettle (plating bath) can be increased, and the molten metal in the plating bath can be achieved. Therefore, uniform plating can be performed and plating quality can be improved.
- the fuel is completely burned in the heating apparatus and injected as molecular kinetic energy, so the temperature of the discharge port of the apparatus may be considerably lower than a normal gas burner, for example, It may be about the furnace temperature or less.
- the high-speed burner used as a heating means of the conventional metal plating furnace is completely burned inside the apparatus, for example, fuel is burned outside rather than inside the burner and discharged from the burner outlet as a flame.
- the conventional high-speed burner has a temperature as a flame, which is very high compared with the temperature of the heating device of the present invention.
- the temperature difference at the discharge port greatly affects the loss of combustion gas, and according to the heating method of the present invention, it is possible to dramatically improve the thermal efficiency. More specifically, according to the heating method of the present invention, the molecules themselves filled in the heating chamber are at a low temperature and are converted into heat only when they collide with the object to be heated (ex. Plating bath). The room temperature is not increased more than necessary. That is, as compared with the case where a normal burner is used, it is possible to suppress the loss of combustion gas at the exhaust port (thermal energy exhausted as high-temperature gas), and it is possible to reduce the amount of gas used. .
- the molten metal plating furnace of the present invention consumes about 40-80% of the gas consumption compared to a metal hot dipping furnace equipped with a heating device such as a conventional gas burner. Since it can be reduced, the production capacity can be greatly expanded.
- the present invention it is not necessary to heat to a temperature equal to or higher than the temperature in the furnace, and it is possible to always operate at the same temperature as the temperature in the furnace, and to uniformly heat the entire plating bath (pot). Is performed, and uniform heat penetration is performed to the deep part, and variation in the temperature of the molten metal can be suppressed (in the present invention, the variation in temperature in the plating bath can be set to 20 ° C. or less). Is). Therefore, distortion and surface cracks of the processed product do not occur, and the processing quality can be improved.
- the temperature variation in the plating bath is as shown in the following examples.
- each location in the bathtub (temperature variation) The difference between the maximum temperature and the minimum temperature at the molten metal temperature measured at (measurement location) is shown.
- the control temperature is at least equal to or higher than the melting temperature of the metal serving as the plating material, and is preferably a temperature commonly used in molten metal plating, for example, the melting temperature of the metal serving as the plating material + 20 ° C. or higher and not too high. Temperature (for example, in the case of hot dip galvanizing, it is about 440 to 460 ° C.).
- each location (temperature variation measurement location) in the bathtub is, for example, each location (preferably, each equally divided section) when the bathtub is equally divided in the longitudinal direction (at least equal to 5 or more). Each center).
- the measurement value of the continuous temperature change measured when the metal is melted for a certain time is referred to.
- hydrocarbon gas is used as an energy fuel, and it is possible to control the combustion so as not to reach a high temperature while maintaining the stability of air and gas, thereby suppressing the generation of CO, NOx and the like. It can also reduce the environmental load.
- the molten metal plating furnace according to the present invention can be appropriately incorporated into a known metal plating product manufacturing system having a plating execution unit for performing molten metal plating on a workpiece to be plated.
- a plating execution unit for performing molten metal plating on a workpiece to be plated.
- only a plating bath as a molten metal reservoir and a heating device as a heating source of the plating bath are provided. It may be incorporated.
- a metal plating steel pipe manufacturing system will be described as a suitable example of a metal plating product manufacturing system incorporating the molten metal plating furnace according to the present invention.
- the system of the metal-plated steel pipe incorporating the hot-dip metal plating furnace according to the present invention is not limited at all, and may be appropriately incorporated in an equipment (plating execution section) for plating the steel pipe (steel plate) in an arbitrary form. More specifically, the molten metal plating furnace according to the present invention (for example, a plating bath and a heating device for heating the plating bath), a facility for melting a metal for plating (metal melting portion) or a molten metal was melted. What is necessary is just to incorporate in the plating implementation part of a well-known metal plating steel pipe system as equipment (molten metal storage part) which stores a metal.
- equipment molten metal storage part
- the molten metal plating furnace according to the present invention for example, heating the plating bath and the plating tub is used as an alternative to the dopping equipment
- Heating device may be used.
- a metal plating steel pipe system for example, a metal plating steel pipe system disclosed in Japanese Patent Application Laid-Open No. 5-148607
- a molten metal plating tank molten metal
- a molten metal plating furnace for example, a plating bath and a heating device for heating the plating bath
- a molten metal plating furnace for example, a plating bath and a heating device for heating the plating bath
- the following effects can be obtained in relation to the effects in the above-described molten metal plating furnace.
- the heating device 10 according to the present embodiment is efficiently used by a heating method different from the conventional one (a specific heating method that can collide and vibrate the kinetic energy held by the combustion gas molecules generated by combustion and convert it into thermal energy). Because it is possible to melt the metal and easily replace the existing heating device, the existing equipment with similar structure of the molten metal plating furnace does not require major modification and investment, and the metal plated steel pipe Productivity can be improved.
- the furnace (tub) needs to have a certain size. Even when forming a plating layer by pumping and pouring molten metal from a molten metal plating furnace (molten metal storage part), the furnace (tub) has a certain size to store a sufficient amount of molten metal. It is necessary to do it. However, by using the specific heating method described above, rapid heating is possible. As a result, the furnace equipment itself can be reduced by preventing an extreme temperature drop of the molten metal. The entire manufacturing system (equipment) can be downsized.
- the temperature range of the molten metal can be finely controlled. Therefore, when the metal to be plated is a dissimilar metal (for example, Japanese Patent Application No. 2011-528569) Even in the case of plating with two kinds of metals, temperature control is easy. More specifically, for example, when the optimum ranges of the two kinds of metals overlap to some extent (when the difference between the melting points of the two kinds of metals is not too large), the temperature of the molten metal falls within the overlapping range. Therefore, it is possible to perform plating using the two kinds of metals. On the other hand, according to the conventional heating method, when two kinds of metals are heated and melted in the same furnace, the temperature range in the furnace varies. When the desired temperature range of the metal is set, other types of metals will be out of the desired temperature range.
- the metal hot dipping plating furnace according to the present invention is a system (for example, a special technique) for forming a steel pipe (cold forming from a strip steel to a tube), welding and hot metal plating by a continuous line. It can also be incorporated into a metal-plated steel pipe production line as shown in Kaihei 5-148607. When the metal hot dipping plating furnace according to the present invention is incorporated in such a system, it is possible to efficiently melt the metal.
- the molten metal in the furnace (tub) It becomes possible to prevent an extreme temperature drop or the like (for this reason, it is difficult to cause a situation in which the line is delayed in order to raise the temperature of the molten metal to an appropriate temperature).
- the slowest equipment can determine the production capacity limits (for example, cutting machine speed, equipment capacity, plating furnace heating). Performance etc. can be rate limiting).
- the production capacity limits for example, cutting machine speed, equipment capacity, plating furnace heating.
- Performance etc. can be rate limiting.
- the more steel pipes (steel plates) that pass through the furnace the lower the temperature of the molten metal in the furnace and the higher the speed of the line.
- the heating efficiency (temperature increase rate) of the molten metal is increased, and even if a large amount of steel pipe (steel plate) passes through the furnace (tub), the temperature is lowered. It is difficult to improve the production volume (production capacity) of the plated steel pipe of the entire system.
- Japanese Patent Publication No. 52-43454 proposes a technique of continuously forming a steel sheet from a steel strip into a tubular shape and then welding and applying a molten metal plating to manufacture an outer plated steel pipe. . Furthermore, in response to the recent increase in the need for inner surface metal plating, for example, in Japanese Patent Application Laid-Open No.
- plating is performed on one side corresponding to the inner surface of a steel pipe with respect to a steel strip in a steel pipe manufacturing line. After that, it is cold-formed into a tubular shape, and after welding the longitudinal end faces of the strip steel, the outer surface of the steel pipe is molten metal plated, so that both the inner and outer surfaces of the steel pipe can be easily manufactured on the continuous line.
- a possible method is also proposed.
- Specs of steel pipes manufactured in these continuous lines vary. That is, characteristics such as the diameter and corrosion resistance of the steel pipe must be changed according to the demands of consumers. Then, after the steel pipe of one specification is manufactured in the continuous line, the steel pipe of another specification is further manufactured. At this time, it is necessary to adjust the molten metal immersion time in the plating process. With normal dove dipping plating, it is only necessary to adjust the immersion time in the molten metal. However, in the plating process with a continuous line, if the immersion time is adjusted, the line speed can only be changed. There were problems such as affecting production efficiency.
- the present invention relates to a method for manufacturing a steel pipe in a continuous line, in which the immersion time can be easily adjusted, and without stopping the line and the line speed.
- the manufacturing method and manufacturing system of a metal-plated steel pipe capable of making the plating immersion time that can cope with changes in the thickness of the metal-plated steel pipe incorporated into the molten metal plating furnace according to the present invention, work efficiency and plating are further improved. We found that the quality can be improved.
- the steel pipe plating system in this embodiment is specifically as follows.
- This form (1) is a steel pipe manufacturing system that manufactures a steel pipe that has been subjected to molten metal plating on the inner or outer surface or any one surface in a continuous production line from a steel strip,
- An inner plating portion for example, an inner surface molten metal plating apparatus A5 for pouring molten metal by pouring molten metal on the upper side of the steel strip corresponding to the inner surface of the steel pipe;
- a steel pipe forming section (for example, for obtaining a continuous steel pipe by seam welding a longitudinal end face joint portion of the steel strip formed in the steel pipe is continuously cold-formed into a tubular shape subjected to inner plating.
- an outer surface plating execution unit for example, an outer surface molten metal plating apparatus A13
- the outer surface of the steel pipe is immersed in molten metal to perform molten metal plating
- the molten metal immersion length in the inner plating portion and / or outer plating portion can be adjusted.
- the inner surface plating unit for example, the inner surface molten metal plating apparatus A5
- a pouring part for example, a pouring part 501 in which molten metal is poured on the upper side of the steel strip
- a molten metal supply section for example, a molten metal pump 550
- An inner surface wiping portion for example, an inner surface wiping portion 503 for removing molten metal poured by the pouring portion
- This form (3) is a system of the said form (2) with which the said pouring part has a moving means (for example, movable part 504) which can move in parallel with the advancing direction of a strip steel.
- the mode (4) is the system according to any one of the modes (1) to (3) in which the position of the inner surface wiping portion is fixed.
- the outer plating portion is A plurality of continuous steel pipes arranged in the direction of travel of the continuous steel pipe, wherein the continuous steel pipe has a space through which molten metal is introduced and the outer surface of the continuous steel pipe can be immersed in the molten metal.
- Immersion part for example, immersion part 601
- An outer surface wiping part for example, wiping part 602 for removing excess metal from the continuous steel pipe immersed in the molten metal by the immersion part
- a molten metal supply part for example, a molten metal pump 550
- the molten metal supply unit can supply the molten metal by changing the number of dipping units for supplying the molten metal.
- the outer surface wiping portion is installed immediately after each of the plurality of immersion portions, The system according to the aspect (5), which can determine which of the plurality of wiping units is to be operated.
- the outer surface wiping part installed between the immersion parts is An annular part (for example, annular part 60201) surrounding the continuous steel pipe; A plurality of gas ejection holes (for example, gas ejection holes 60202) formed inside the annular portion,
- the annular portion is a ring-opening movable wiping portion (for example, the ring-opening movable wiping portion 602-1) that can be moved to a position away from the continuous steel pipe when the annular portion opens. is there.
- the plating execution unit is a specific plating execution unit (specific plating execution unit) incorporating the metal hot-dip plating furnace. More specifically, in the hot-dip plated steel pipe manufacturing system according to this embodiment, the molten metal plating is used as a molten metal source (a molten metal supply source of a molten metal supplied to the molten metal pump 550) in the inner surface molten metal plating apparatus A5.
- a molten metal source a molten metal supply source of a molten metal supplied to the molten metal pump 550
- a furnace is incorporated, and further, the molten metal plating furnace is incorporated (inner surface) as a molten metal source (a molten metal supply source of molten metal supplied to the molten metal pump 550) in the molten metal plating apparatus A13 for the outer surface.
- the molten metal plating apparatus A5 for use and the molten metal plating apparatus A13 for the outer surface will be described later).
- the inner plating portion and the outer plating portion are both specified plating portions.
- the present invention is not limited to this, and either the inner plating portion or the outer plating portion is specified.
- FIG. 13 is a schematic configuration diagram of a hot-dip plated steel pipe manufacturing system according to this embodiment.
- This manufacturing system includes an uncoiler A2 that continuously supplies a long steel sheet (band steel) wound around a coil A1, and a forming device A7 that continuously forms the steel sheet supplied from the uncoiler A2 into a tubular shape.
- a molten metal plating apparatus A5 for hot-plating a desired metal on the steel sheet and a longitudinal end surface joint portion of the plated steel sheet formed into a tubular shape are continuously welded to form a tubular body.
- the outer surface of the molten metal plating apparatus A13 for forming a molten metal plated steel pipe by hot metal plating, the sizing apparatus A15 for forming a hot dip galvanized steel pipe into standard dimensions, and the hot dip galvanized steel pipe are provided. It includes the cutting device A16 for cutting to length, a.
- the shot blasting device A3, the pretreatment device A4 for applying an antioxidation flux solution, drying and preheating, the outer surface of the tubular body, and the antioxidation flux solution are continuously applied.
- a first cooling bath A6 for cooling the steel plate after hot dipping and a second cooling bath A14 for cooling the tubular body after hot dipping are provided as necessary depending on the properties of the plated metal.
- the cooling bath is essential when the metal plating is zinc plating.
- a method of applying a flux to the surface of the steel plate and drying / preheating is adopted, but other known methods are employed. You may clean by a system.
- the Zenjima method heat-annealed in a hydrogen atmosphere in the reduction zone, resulting in slight oxidation. Steel plate surface is reduced and cooled
- non-oxidation furnace method method in which the Sendima type oxidation furnace is replaced with a non-oxidation furnace
- a known method such as a steel method (a method in which pickling is further performed after removing the rolling oil attached to the steel sheet surface by an alkaline electrolytic cleaning device) may be applied. Further, the steel plate may be pickled or washed with water at an appropriate timing.
- FIG. 14A is a schematic cross-sectional view taken along the line XX ′ of the inner surface molten metal plating apparatus A5 according to the best mode
- FIG. 14B is a conceptual side view of the inner surface molten metal plating apparatus A5.
- An inner surface molten metal plating apparatus A5 according to the best mode includes a molten metal pump 550 for supplying molten metal into the pouring part, and the molten metal sent from the molten metal pump is poured onto the steel strip for plating.
- An internal wiping portion 503 for example, a blow-off device such as an inert gas or an air wiper
- a movable portion 504 silica base frame
- the molten metal pump 550 includes an impeller case 551 housing an impeller for pumping molten metal, and an impeller shaft for transmitting the rotational driving force of the pump motor to the impeller housed in the impeller case.
- the pouring portion 501 is not particularly limited, and includes, for example, a box body 501 a and a plurality of molten metal pouring holes 501 b formed at the bottom thereof.
- the molten metal immersion length means the distance from the pouring hole located at the most upstream side of the line to the wiping portion 503.
- the wiping unit 503 may be movable, but when a cooling bath is required, particularly when galvanizing is performed, the position of the wiping unit 503 is fixed to make the distance to the cooling bath constant. Is preferred.
- the molten metal plating furnace 100 may be incorporated as a molten metal source (a molten metal source of molten metal supplied to the molten metal pump 550) in the inner surface molten metal plating apparatus A5.
- FIG. 16 is a diagram showing a schematic diagram of the movable part according to the best mode.
- the movable part 504 has a base frame 50401 and a pump main body base 50402.
- the pump body base is connected to the pouring part 501, and by moving the part, the pouring part moves and the molten metal immersion length can be adjusted.
- the base frame includes a pair of slide base frames 50403, a rack gear 50404 formed so as to be fitted to a pinion gear, which will be described later, installed on substantially the entire surface of one side of the slide base frame, and at least one of the slide base frames.
- And positioning sensor A50405 installed at substantially equal intervals.
- the pump main body base has a pump main body 50406, a top plate 50407, and side plates 50408 formed on both side surfaces of the top plate, and receives the weight of the pump formed on the two side plates and moves the pump main body.
- a base frame support body 50412 may be provided below the base frame.
- the rack gear 50404 fixed to the slide base frame 50403 and the pinion gear 50410 are configured to move to a positioning sensor A 50405 disposed at a preset distance with strong and reliable transmission without slipping.
- the moving method is not limited to the above method, and there is also a method of setting the moving distance without a positioning sensor by the number of rotations of the pinion gear by an electric motor and a transmission, or a servo motor, for example.
- the outer surface molten metal plating apparatus A13 includes a plurality of units shown in FIG. 17 (for example, four).
- FIG. 17A is a schematic cross-sectional view taken along the line XX ′ of one unit of the outer surface molten metal plating apparatus A13 according to the best mode
- FIG. 17B shows the outer surface molten metal plating apparatus A13. It is a conceptual side view concerning one unit.
- the outer surface molten metal plating apparatus A13 stores the molten metal pump 550 for supplying the molten metal into the immersion portion, and the molten metal sent from the molten metal pump, and passes the steel pipe A9 to perform the molten plating process.
- An immersion part 601 and a wiping part 602 for example, a blow-off device such as an inert gas or an air wiper
- the wiping unit will be described in detail later.
- FIG. 18 shows an outline of the periphery of the steel pipe when the units according to the outer surface molten metal plating apparatus are arranged.
- the immersion part 601 of each unit is continuously arranged in the traveling direction of the steel pipe.
- the distance from the exit between each immersion part to an entrance is a distance of the grade in which the steel pipe is continuously immersed by the molten metal which flows out from the entrance / exit of the said immersion part.
- a wiping portion 602 is provided downstream of each immersion portion. It is preferable that the wiping unit is configured so that only the part immediately after the immersion part to which the molten metal is supplied can be operated. This is because it is considered that the steel pipe immersed in the molten metal is cooled by wiping, which affects the plating quality.
- the wiping portions 602a to 602c provided between the immersion portions are ring-opening movable wiping portions 602-1. The configuration of the ring-opening movable wiping unit 602-1 is shown in FIG.
- the ring-opening movable wiping portion 602-1 includes an annular portion 60201 that surrounds the outer periphery of the steel pipe, and a plurality of gas ejection holes 60202 (not shown) that are formed inside the annular portion and blow gas to the steel pipe. And a support body 60203 for supporting the annular portion.
- the annular portion 60201 has a notch 60204 so that the annular portion can be split in half, and is formed so as to be movable away from the steel pipe by moving the support in a direction away from each other.
- the gas ejection hole is not blocked by the molten zinc flowing out from the entrance / exit because it can be moved to a position away from the entrance / exit of the immersion part.
- the immersion length By adjusting the immersion length, the thickness of the plated alloy layer on the outer surface of the steel pipe can be made constant.
- the outer surface molten metal plating apparatus A13 can be used when plating the same kind of metal (for example, molten zinc).
- outer surface molten metal plating apparatus A13 When different types of metals are further plated (special plating), different types of metals may be introduced into these immersion parts.
- another outer surface molten metal plating apparatus (for example, the same configuration) may be installed downstream of the outer surface molten metal plating apparatus A13.
- the molten metal plating furnace 100 may be incorporated as a molten metal source (a molten metal source of molten metal supplied to the molten metal pump 550) in the outer surface molten metal plating apparatus A13.
- a steel sheet wound in a coil shape is continuously supplied from the uncoiler A2 toward the downstream of the line. Subsequently, after a predetermined pretreatment is performed by the shot blasting apparatus A3 and the pretreatment apparatus A4, the supplied steel sheet is subjected to an inner surface plating process by an inner surface molten metal plating apparatus A5 on one side. The inner plating process will be described in detail later. Then, after cooling the steel plate plated on one side by the cooling bath A6, the steel plate is drawn into the forming device A7 and cold-formed into a tubular shape, and the longitudinal end surface joining portion of the steel plate is continuously formed by the welding device A8. By welding, a continuous tubular body A9 is formed.
- tubular body A9 is sent to a cutting apparatus A10 to which a cutter having a shape along the outer surface of the tubular body A9 is attached. And the weld bead part formed in the outer surface of tubular body A9 is scraped off with the cutter of cutting device A10, and the outer surface of tubular body A9 is formed smoothly.
- the tubular body is sent to the flux coating apparatus A11, and a flux liquid for cleaning and antioxidant is applied to the outer surface of the tubular body.
- the tubular body A9 is sent to the preheating device A12 to be preheated, and its outer surface is dried.
- the tubular body is sent to the outer surface molten metal plating apparatus A13.
- the tubular body A9 is immersed in the immersion part filled with the pumped-up molten metal in the molten metal plating apparatus A13 for outer surface, and the entire outer surface is subjected to molten metal plating.
- the tubular body A9 immersed in the immersion part is formed with a molten metal plating layer having a sound alloy layer, and after the excess molten metal plating is removed by the wiping device 602, a molten metal plated steel pipe is formed. Then, it cools by cooling tank A14.
- the outer surface molten metal plating process will be described in detail later.
- the molten metal plated steel pipe is cold-rolled in the sizing device A15 in order to set the outer diameter to the standard dimension.
- the cold roll process is a process necessary to make the molten metal plating layer have a relatively uniform thickness in the circumferential direction. In other words, even if the molten metal plating layer immediately after being formed by the outer surface molten metal plating apparatus has a non-uniform thickness in the circumferential direction, the molten metal is subjected to a subsequent process such as cold roll processing.
- the plating layer can be leveled to a relatively uniform thickness.
- the molten metal plating layer by the outer surface molten metal plating apparatus, for example, sizing processing such as cold roll processing is performed, and the molten metal plating formed by the molten metal plating process is performed. It is desirable to adopt a step of making the layer a relatively uniform thickness (a step of making the thickness distribution more uniform than immediately after forming the molten metal layer).
- the molten metal-plated steel pipe is cut into a predetermined length by a cutting device A16 to become a steel pipe product A17.
- the inner surface plating treatment is a step in which the molten metal poured onto the steel strip B from the pouring portion 501 of the inner surface molten metal plating apparatus A5 is removed by the wiping portion 503.
- the inner surface plating method used in the continuous line is performed by pouring molten metal onto the steel strip from above.
- immersion in the normal sense is not performed, but assuming that the molten metal is placed on the steel strip by pouring, the distance between the pouring part and the wiping part is the molten metal immersion length. To adjust as.
- the plating alloy layer thickness by adjusting the immersion time of the molten metal by changing the distance between the pouring part 501 and the wiping part 503 without changing the line speed.
- the plating alloy layer thickness can be kept constant by adjusting the distance between the pouring portion 501 and the wiping portion 503 short. That is, since the plating alloy layer thickness can be made substantially constant, problems such as cracking and peeling of the plating layer are less likely to occur.
- the plating layer thickness can be easily adjusted only by adjusting the air or N 2 gas pressure ejected from the wiping unit 503.
- the steel strip is started up vertically from the molten metal pot at high speed.
- the adhesion amount of the molten metal lifted along with the steel strip by the viscous force is adjusted by air or N 2 gas wiping.
- the heating capacity for plating the steel strip is determined as the equipment capacity, when the steel strip is thick, the sheet feeding speed is slowed down. Therefore, the molten metal that is lifted is reduced, and it is difficult to increase the amount of plating.
- the inner plating step is performed by air or N 2 regardless of the amount of molten metal lifted by passing the steel strip in the horizontal direction instead of vertically, regardless of the thickness of the steel strip. Adhesion amount can be controlled by gas wiping pressure.
- the molten metal has fallen naturally due to the effect of gravity, and further thinning of the plating layer may have been performed by further wiping.
- the plating object is passed (for example, through plate) in the horizontal direction, since such a gravitational effect cannot be obtained, a necessary amount of wiping is increased, so that a thick plating layer is easily formed.
- the plating layer is easily cooled and solidified from the molten metal immersion part to the wiping) (that is, in the case of this method, the adjustment of the plating layer thickness is easy in the range of the thick plating layer thickness).
- the preparation of the plating layer thickness may be difficult).
- the temperature of the molten metal is set in advance to prevent cooling and solidification of the molten metal in the wiping section (molten metal). It is possible to reduce the plating thickness by increasing the amount of wiping. However, the temperature of the molten metal is also involved in the reaction of the alloy layer of the plating layer, and if the temperature of the molten metal is increased unnecessarily, the alloying of the metal proceeds faster, so that the uniform and high quality is achieved. It becomes difficult to obtain a plating layer.
- the temperature range of the molten metal in the molten metal bath varies so much that the temperature of the molten metal to properly cause the plating reaction should be maintained.
- the control temperature must be lowered to some extent so that the temperature of the molten metal does not become too high. Therefore, when a conventional molten metal furnace is incorporated in this method, it may be difficult to adopt a method in which the plating thickness is reduced by setting the temperature.
- the temperature of the molten metal is precisely adjusted within a desirable range (a range that does not become excessive) of the molten metal. It is possible to control (for example, variation in temperature in the plating bath can be suppressed within 20 ° C.). Therefore, by incorporating the molten metal plating furnace according to the present invention, even in this method, it becomes difficult for the molten metal to be cooled and solidified during wiping (making the molten metal easy to flow), and the amount of wiping can be increased. It is easy to form a uniform and thinned plating layer.
- the plating layer thickness is 4 ⁇ m or less even in this method in which the object to be plated is passed (for example, through plate) in the horizontal direction. It becomes easy to do.
- the effect of thinning the plating layer can be obtained not only in the inner plating process of this method but also in the outer plating process described later, as in this method. It is obtained in general methods for passing an object to be plated in the horizontal direction (for example, through plate). Furthermore, it can also be obtained in a method other than a method of passing a plating object in the horizontal direction (for example, a plate) (for example, a conventional method of pulling out in the vertical direction) (that is, obtaining a thinner film). Can be).
- the outer plating alloy layer thickness can be adjusted by filling the immersion part with the molten metal as many as required for the plating alloy layer thickness to be obtained from among a plurality of molten metal plating apparatuses for outer surfaces. In addition, by adjusting the plating alloy layer thickness in this way, it is possible to keep the outer plating alloy layer thickness constant even when the line speed changes.
- the thickness of the alloy layer is preferably 4 ⁇ m or less, more preferably 3 ⁇ m or less, and even more preferably 2 ⁇ m or less.
- the immersion time in the plating step is preferably 1 second or less, more preferably 0.3 seconds or less, and 0.25 seconds. The following are more preferred.
- FIG. 20 shows the relationship between the molten metal immersion length and the plating speed when the alloying layer is set to 1 ⁇ m when the plating unit is not a specific plating unit.
- the plating speed is the length of the steel pipe to be plated in a continuous line per unit and is the same as the pipe making speed (line speed). That is, when it is desired to keep the thickness of the alloy layer at 1 ⁇ m, the molten metal immersion length may be set so as to satisfy the relationship of FIG.
- the thickness of the alloy layer is made constant by paying attention to the molten metal immersion length.
- the temperature of the molten metal can be more precisely controlled as described above by setting the plating execution part as the specific plating execution part, the temperature of the molten metal varies in the specific plating execution part. It becomes difficult to be affected. Therefore, it becomes possible to more accurately determine the conditions for setting the alloy layer to a specific thickness in the preliminary test stage for determining the relationship between the molten metal immersion length and the plating rate as shown in FIG. On the other hand, when the temperature of the molten metal varies, it is difficult to obtain accurate data).
- the reproducibility with respect to the preliminary conditions (relationship between the molten metal immersion length and the plating speed to obtain a specific alloy layer thickness) obtained in the preliminary test is improved. Excellent (suppresses the influence of the temperature variation of the molten metal that affects the thickness of the alloy layer, making it easier to achieve the target thickness based on the preliminary conditions).
- the present invention is not limited to the best mode described above.
- the molten metal plating layer by the melting device is formed on both the inner and outer surfaces, but the molten metal plating layer by the molten metal plating device may be provided only on the inner surface or the outer surface.
- the upper surface of the outer plating layer may be covered with a protective film made of synthetic resin or the like. If it does in this way, the rust prevention effect of a hot-dip metal plating steel pipe can be improved more.
- the plating applied to the steel pipe in the best mode is not particularly limited, and examples thereof include zinc, but other metals may be applied as necessary.
- this best mode demonstrated on the assumption that a steel plate was used, you may presuppose that this invention uses another metal plate. Examples of such a metal plate include, but are not limited to, copper tape and aluminum tape.
- Example 1 Using the molten metal plating furnace 100 provided with the heating device 10 shown in FIG. 8, the zinc is melted in the zinc bath inside the iron pot 101, the control temperature in the central portion of the bath is set to 450 ° C. The temperature of the molten zinc was measured at five locations (a, b, c, d, e) in the hot zinc bath (plating bath) (the control temperature was controlled using c as a temperature reference point). ). The minimum temperature and the maximum temperature at the measurement temperature at each location were plotted on a graph (shown in FIG. 10 (a)).
- the heating apparatus 10 of the metal plating furnace is a heating apparatus that employs a specific heating method that can collide and vibrate the kinetic energy held by the combustion gas molecules generated by combustion and convert it into thermal energy.
- the temperature of the molten zinc was measured in the same manner as in the example except that the metal plating furnace 200 shown in FIG. 9 was used. That is, zinc is melted in a zinc bath inside the iron pot 201 to a control temperature of 450 ° C., and at five locations (a, b, c, d, e) in the zinc bath (plating bath) during soaking. The temperature of the molten zinc was measured. The minimum temperature and the maximum temperature at the measured temperature at each location were plotted on a graph (shown in FIG. 10B).
- the heating apparatus 210 for the metal plating furnace is a conventional burner.
- the difference between the minimum temperature and the maximum temperature is 16 ° C. in the embodiment of the present invention with respect to the control temperature of 450 ° C.
- the temperature variation of was small.
- the difference between the lowest temperature and the highest temperature was 30 ° C., and the temperature variation at five locations was large. That is, in comparison with a plating furnace equipped with a conventional burner, which is a conventional heating method, the plating furnace of the embodiment adopting the novel heating method of the present invention has excellent temperature controllability and the molten metal in the bathtub. It was found that the temperature uniformity was high.
- galvanized products were produced using the plating furnaces shown in the examples and comparative examples.
- the bath temperature at the time of plating was controlled at 450 to 453 ° C. (temperature control with the bath center being the temperature reference point).
- the pulling rate was 200 mm / s and the plating time was 120 s.
- Tables 1 and 2 and FIG. 11 Photos 1 to 4).
- the variation in the amount of plating adhered due to the position in the bath is small, and the thickness of the alloy layer It turned out that there is a tendency for the variation of to be small.
- the plating product of the example was 0.47 ⁇ m, whereas the plating product of the comparative example The thickness was 50.95 ⁇ m (see Tables 1 and 2).
- Photo 1 and Photo 2 are cases where a plated product was produced using a plating furnace equipped with a heating device employing a specific heating method according to the present invention, and Photo 1 is in the vicinity of the center of the bathtub, Photo 2 is a photograph of a plated product that has been plated near the wall of the bathtub.
- Photo 3 and Photo 4 are obtained when plating is performed using a conventional plating furnace equipped with a burner.
- Photo 3 is obtained by plating near the center of the bathtub
- Photo 4 is obtained by plating near the wall of the bathtub. It is a photograph of a plated product.
- a tool capable of simultaneously plating two samples at different locations is used as a jig used at the time of plating.
- the molten metal plating furnace provided with the heating device employing the specific heating method according to the present invention has little temperature variation in the plating furnace and is excellent in temperature controllability. Moreover, alloying of the contact portion with zinc inside the iron pot is suppressed, and generation of dross can be suppressed. This leads to an improvement in plating quality by reducing dross impurities, and also leads to a reduction in periodic dross pumping work, thereby realizing an improvement in work efficiency.
- the molten metal plating furnace of the present invention has a small temperature difference in the plating furnace, and a small burden on the kettle, preventing oxidation corrosion of the outer wall of the kettle and suppressing alloying of the kettle inner wall. Costs can be reduced by extending the service life.
- the molten metal plating furnace of the present invention has high temperature uniformity in the plating furnace, the plating reaction can be made uniform and variations in plating quality can be suppressed. This is supported by the measurement result of the amount of plating adhered by the production of galvanized products.
- the molten metal plating furnace of the present invention can produce a plated product with excellent plating quality, it can also be applied to the production of high-grade plated products. Also, the plating process can be performed at a lower temperature than the conventional plating furnace (the temperature of the molten metal varies depending on the position in the bath, so the control temperature for guaranteeing the melting temperature can be set as low as possible). The width of the object to be applied is widened, and various objects can be plated. Furthermore, the work efficiency of the system and the quality of plating can be improved by appropriately incorporating the molten metal furnace into the metal plating product manufacturing system.
- Heating device (combustion device) DESCRIPTION OF SYMBOLS 100 Molten metal plating furnace 101 Plating bath 200 Conventional molten metal plating furnace 201 Plating bath 202 Inner wall 203 Heat resistant outer wall 204 Heating chamber 210 Conventional burner A1: Coil A2: Uncoiler A3: Shot blasting device A4: Pretreatment device A5: Inner surface Molten metal plating apparatus A6: First cooling bath A7: Forming apparatus A8: Welding apparatus A9: Tubular body A10: Cutting apparatus A11: Flux application apparatus A12: Preheating apparatus A13: External molten metal plating apparatus A14: Second cooling Tank A15: Sizing device A16: Cutting device
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Abstract
Description
前記加熱装置が、
中心軸(14)を中心にして整然と延びている燃焼室(12)であって、該燃焼室(12)の軸方向に延びている壁(26、64、66)の少なくとも一部に、該燃焼室(12)に沿った共通の燃焼領域へと燃料および空気を排出するように面する燃料充てん開口部(28.1)の配列(22)および空気充てん開口部(28.2)の配列(24)が形成されており、前記燃料充てん開口部(28.1)のサイズが、前記空気充てん開口部(28.2)のサイズに対して効果的な燃焼反応を達成するための適切な関係にある燃焼室(12)と、
燃焼後の媒体の排出速度を加速するための徐々に狭くなる燃焼後媒体排出部(16)と、
前記燃料充てん開口部配列(22)および前記空気充てん開口部配列(24)へとそれぞれ開いており、各々を燃料または空気のいずれかであるそれぞれの媒体の供給源へと接続することができる燃料供給部(20)および空気供給部(18)と
を備えており、
使用時に、前記燃焼室(12)を、可燃混合物に点火するための点火手段(34)へと曝すことができる燃焼装置(10)であって、
少なくとも一方の開口部配列(22、24)の少なくとも大部分の開口部(28)の開口部有効断面サイズを、適切な媒体充てん開口部配列(22、24)の程度を調節するための調節機構(30、44、46、48、58、68、70、76)によって制御可能に調節することができ、両方の開口部配列のサイズが調節可能である場合には、それらの配列の別個独立な調節が可能な加熱装置である
ことを特徴とする溶融金属めっき炉である。
被めっき処理物に溶融金属めっきを施すめっき実施部を少なくとも一つ有し、
前記めっき実施部の少なくとも一つは、めっき浴槽と、めっき浴槽を加熱するための加熱装置を有し、
前記加熱装置が、
中心軸(14)を中心にして整然と延びている燃焼室(12)であって、該燃焼室(12)の軸方向に延びている壁(26、64、66)の少なくとも一部に、該燃焼室(12)に沿った共通の燃焼領域へと燃料および空気を排出するように面する燃料充てん開口部(28.1)の配列(22)および空気充てん開口部(28.2)の配列(24)が形成されており、前記燃料充てん開口部(28.1)のサイズが、前記空気充てん開口部(28.2)のサイズに対して効果的な燃焼反応を達成するための適切な関係にある燃焼室(12)と、
燃焼後の媒体の排出速度を加速するための徐々に狭くなる燃焼後媒体排出部(16)と、
前記燃料充てん開口部配列(22)および前記空気充てん開口部配列(24)へとそれぞれ開いており、各々を燃料または空気のいずれかであるそれぞれの媒体の供給源へと接続することができる燃料供給部(20)および空気供給部(18)と
を備えており、
使用時に、前記燃焼室(12)を、可燃混合物に点火するための点火手段(34)へと曝すことができる燃焼装置(10)であって、
少なくとも一方の開口部配列(22、24)の少なくとも大部分の開口部(28)の開口部有効断面サイズを、適切な媒体充てん開口部配列(22、24)の程度を調節するための調節機構(30、44、46、48、58、68、70、76)によって制御可能に調節することができ、両方の開口部配列のサイズが調節可能である場合には、それらの配列の別個独立な調節が可能な加熱装置である
ことを特徴とするシステムである。
前記加熱装置が、
中心軸(14)を中心にして整然と延びている燃焼室(12)であって、該燃焼室(12)の軸方向に延びている壁(26、64、66)の少なくとも一部に、該燃焼室(12)に沿った共通の燃焼領域へと燃料および空気を排出するように面する燃料充てん開口部(28.1)の配列(22)および空気充てん開口部(28.2)の配列(24)が形成されており、前記燃料充てん開口部(28.1)のサイズが、前記空気充てん開口部(28.2)のサイズに対して効果的な燃焼反応を達成するための適切な関係にある燃焼室(12)と、
燃焼後の媒体の排出速度を加速するための徐々に狭くなる燃焼後媒体排出部(16)と、
前記燃料充てん開口部配列(22)および前記空気充てん開口部配列(24)へとそれぞれ開いており、各々を燃料または空気のいずれかであるそれぞれの媒体の供給源へと接続することができる燃料供給部(20)および空気供給部(18)と
を備えており、
使用時に、前記燃焼室(12)を、可燃混合物に点火するための点火手段(34)へと曝すことができる燃焼装置(10)であって、
少なくとも一方の開口部配列(22、24)の少なくとも大部分の開口部(28)の開口部有効断面サイズを、適切な媒体充てん開口部配列(22、24)の程度を調節するための調節機構(30、44、46、48、58、68、70、76)によって制御可能に調節することができ、両方の開口部配列のサイズが調節可能である場合には、それらの配列の別個独立な調節が可能な加熱装置である
ことを特徴とするシステムであってもよい。
前記加熱装置における前記媒体充てん開口部配列(22、24)の各々が、同数の開口部(28)を有していてもよい。
前記加熱装置における前記配列(22、24)の前記開口部(28)が、一定の間隔で位置していてもよい。
前記加熱装置における前記配列(22、24)の前記開口部(28)が、行および列において間隔を空けて位置していてもよい。
前記加熱装置において、すべての開口部(28)の中心軸(38、40)が、前記燃焼室(12)の前記長手方向の中心(14、42)に対して同じ角度で当該加熱装置の排出方向に傾けられていてもよい。
前記加熱装置における前記調節機構(30、44、46、48、58、68、70、76)が、前記少なくとも1つの調節可能な媒体充てん開口部配列(22、24)のためのカバー手段(30、44、58、68、70)を備えており、
前記カバー手段に、前記媒体充てん開口部配列(22、24)に一致するカバー手段開口部配列(32、72、74)が形成され、
前記カバー手段開口部配列が、互いにぴったりと位置する前記カバー手段と前記燃焼室(12)の前記媒体充てん配列を呈する壁(26、64、66)との相対の平行移動に応じて、少なくとも開口部が大きくなる位置合わせの状態と開口部が絞られる位置合わせの状態との間で調節可能に協働することで、当該加熱装置の使用時に前記燃焼室への媒体の流れが調節されていてもよい。
前記加熱装置における前記燃焼室(12)が、前記媒体充てん開口部配列(22、24)を互いに直面させるように構成されていてもよい。
前記加熱装置における前記燃焼室(12)が、中心軸(14)に沿って中央を延びる媒体充てんチャンバ(α)の周囲に環状に形成されることで、燃焼室(12)の長手方向の中心(42)が燃焼室(12)内の中央を環状に延び、結果として前記媒体充てん開口部配列(22、24)が燃焼室の長手方向の内側および外側側壁を定める向かい合う周状の壁(26.1、26.2)に沿って延び、前記媒体充てんチャンバ(α)の内側端が適切に塞がれていてもよい。
前記加熱装置において、少なくとも1つの媒体充てん配列(22、24)の開口部サイズを、前記媒体充てんチャンバ(α)の内側または長手方向に延びて燃焼室を囲んでいる外側の壁(26.2)の外側において、燃焼室を定めている壁(26)の燃焼室から遠い方の表面に沿ってスライド変位可能に取り付けられた円筒形のカバー本体(30、44、58)の形態のカバー手段(30)に応じて、調節することができてもよい。
前記加熱装置において、カバー本体(44、58)が、当該加熱装置の中心軸(14)の方向に制御可能に変位させることができるように取り付けられていてもよい。
前記加熱装置において、両方の媒体充てん開口部配列(22、24)を、開口部が円筒形のカバー本体(44、58)によって調節することができてもよい。
前記加熱装置における前記燃料供給部(20)および前記空気供給部(18)が、一方が燃焼室の長手方向の壁(26.1)の内側を延びており、他方が燃焼室の外側の壁(26.2)に沿って延びている適切に補充することができる充てんチャンバの形態であってもよい。
前記加熱装置における前記燃料充てんチャンバ(20)が、前記燃焼室(12)の内側に位置し、前記空気充てんチャンバ(18)が、前記燃焼室(12)の外側に沿って位置していてもよい。
前記加熱装置において、内側端が適切に塞がれている前記燃焼室(12)が、前記中心軸(14)に沿って延び、長手方向の中心(42)を定めており、
前記調節機構(30、44、68、70、76)が、少なくとも1つの媒体充てん開口部配列(22、24)と調節可能に協働して該少なくとも1つの媒体充てん開口部配列の開口部サイズを調節するカバー手段の形態である場合に、前記燃焼室(12)の適切な長手方向の壁(26、64、66)の外面にスライド可能に取り付けられていてもよい。
前記加熱装置における前記燃料供給部(20)および前記空気供給部(18)が、前記燃焼室の側壁(64、66)の傍らを広がる適切に補充することができる充てんチャンバの形態であってもよい。
前記加熱装置における前記燃焼室(12)が、少なくとも一部に媒体充てん開口部(28)が形成された平坦な側壁で形成されていてもよい。
前記加熱装置における前記カバー手段(30、68、70)が、前記燃焼室の中心軸(14)の方向にストッパ間を変位させられるように取り付けられた開口部付きの少なくとも1枚のカバー板(68、70)の形態であってもよい。
前記加熱装置における前記燃焼室(12)が、矩形の形状であってもよい。
前記加熱装置において、前記燃焼室の向かい合う2つの側壁(68、70)に媒体充てん開口部(28)が形成され、すなわち一方に空気充てん開口部が形成され、他方に燃料充てん開口部が形成されていてもよい。
前記加熱装置において、前記空気充てん開口部配列(24)および前記燃料充てん開口部配列(22)の両方を、開口部が適当に設けられたカバー板(68、70)によって調節することができてもよい。
更に、前記製造システムは、
帯鋼から連続製造ラインにて内外面又はいずれか一方の面に溶融金属めっきを施した鋼管を製造する鋼管製造システムであって、
鋼管の内面に相当する側の帯鋼上側に溶融金属を注ぎかけて溶融金属めっきを施す、内面めっき実施部と、
内面めっきの施された帯鋼を連続的に管状に冷間成形し、該鋼管に成形された帯鋼の長手方向端面接合部をシーム溶接して連続鋼管を得るための鋼管形成部と、
前記鋼管外面を溶融金属に浸漬して溶融金属めっきを施す、外面めっき実施部と
を備え、
前記内面めっき実施部及び/又は外面めっき実施部が、前記めっき浴槽と、前記めっき浴槽を加熱するための前記加熱装置を有することを特徴とする鋼管めっきシステムであってもよい。
帯鋼から連続製造ラインにて少なくとも内面に溶融金属めっきを施した鋼管を製造する鋼管製造システムであって、
鋼管の内面に相当する側の帯鋼上側に溶融金属を注ぎかけて溶融金属めっきを施す、内面めっき実施部と、
内面めっきの施された帯鋼を連続的に管状に冷間成形し、該鋼管に成形された帯鋼の長手方向端面接合部をシーム溶接して連続鋼管を得るための鋼管形成部と、を有し、
前記内面めっき実施部が、
帯鋼上側に溶融金属が注ぎかけられる、注ぎかけ部と、
前記注ぎかけ部に溶融金属が供給可能である、溶融金属供給部と、
前記注ぎかけ部により注ぎかけられた溶融金属を除去する内面ワイピング部と、を有し、
前記注ぎかけ部が、帯鋼の進行方向に対して平行に移動可能な移動手段を有し、
溶融金属が注ぎかけられる最初の位置と、内面ワイピング部の位置との相対距離を調節可能であり、
前記内面めっき実施部が、前記めっき浴槽と、前記めっき浴槽を加熱するための前記加熱装置を有することを特徴とする鋼管めっきシステムであってもよい。
また、前記システムは、
帯鋼から連続製造ラインにて少なくとも外面に溶融金属めっきを施した鋼管を製造する鋼管製造システムであって、
帯鋼を連続的に管状に冷間成形し、該鋼管に成形された帯鋼の長手方向端面接合部をシーム溶接して連続鋼管を得るための鋼管形成部と、
前記鋼管外面を溶融金属に浸漬して溶融金属めっきを施す、外面めっき実施部と、を有する鋼管製造システムにおいて、
前記外面めっき実施部が、
鋼管を通過させて溶融めっき処理を行なう浸漬部と、
前記浸漬部に溶融金属が供給可能である、溶融金属供給部と、
前記浸漬部により溶融金属に浸漬された連続鋼管から余剰の金属を除去する、外面ワイピング部と、を有し、
前記浸漬部が、帯鋼の進行方向に対して平行に移動可能な移動手段を有し、
溶融金属に浸漬される最初の位置と、外面ワイピング部の位置との相対距離を調節可能であり、
前記外面めっき実施部が、前記めっき浴槽と、前記めっき浴槽を加熱するための前記加熱装置を有することを特徴とする鋼管めっきシステムであってもよい。
更に、前記システムは、
帯鋼から連続製造ラインにて内外面に溶融金属めっきを施した鋼管を製造する鋼管製造システムであって、
鋼管の内面に相当する側の帯鋼上側に溶融金属を注ぎかけて溶融金属めっきを施す、内面めっき実施部と、
内面めっきの施された帯鋼を連続的に管状に冷間成形し、該鋼管に成形された帯鋼の長手方向端面接合部をシーム溶接して連続鋼管を得るための鋼管形成部と、
前記鋼管外面を溶融金属に浸漬して溶融金属めっきを施す、外面めっき実施部と、を有する鋼管製造システムにおいて、
前記内面めっき実施部が、
帯鋼上側に溶融金属が注ぎかけられる、注ぎかけ部と、
前記注ぎかけ部に溶融金属が供給可能である、溶融金属供給部と、
前記注ぎかけ部により注ぎかけられた溶融金属を除去する内面ワイピング部と、を有し、
前記注ぎかけ部が、帯鋼の進行方向に対して平行に移動可能な移動手段を有し、
溶融金属が注ぎかけられる最初の位置と、内面ワイピング部の位置との相対距離を調節可能であり、
前記外面めっき実施部が、
前記連続鋼管が通過する空間を有し、当該空間に溶融金属が導入されている場合には連続鋼管の外面を溶融金属に浸漬可能な浸漬部と、
前記浸漬部に溶融金属が供給可能である、溶融金属供給部と、
前記浸漬部により溶融金属に浸漬された連続鋼管から余剰の金属を除去する、外面ワイピング部と、を有し、
前記浸漬部が、帯鋼の進行方向に対して平行に移動可能な移動手段を有し、
溶融金属に浸漬される最初の位置と、外面ワイピング部の位置との相対距離を調節可能であり、
前記内面めっき実施部及び/又は外面めっき実施部が、前記めっき浴槽と、前記めっき浴槽を加熱するための前記加熱装置を有することを特徴とする鋼管めっきシステムであってもよい。
前記内面ワイピング部及び/又は前記外面ワイピング部の位置が移動可能であってもよい。
前記内面ワイピング部及び/又は前記外面ワイピング部の位置が固定されていてもよい。
前記外面めっき実施部において、
前記連続鋼管の進行方向に連続的に並べられた複数の前記浸漬部を有し、
前記溶融金属供給部が、溶融金属を供給する前記浸漬部の個数を変化させて供給することが可能であってもよい。
前記外面ワイピング部が、前記複数の浸漬部の各々の直後に設置されており、
当該複数のうち何れのワイピング部を稼動させるのかを決定することが可能であってもよい。
前記浸漬部間に設置されている前記外面ワイピング部が、
前記連続鋼管を囲む環状部と、
前記環状部の内側に形成された複数の気体噴出孔と、を有し、
前記環状部が開環して、前記連続鋼管から離れた位置に移動可能な開環可動式ワイピング部であってもよい。
ここで、前記めっき浴槽内の温度のばらつきが20℃以内であってもよい。
加熱装置10は、燃焼器ユニットの形態の可変開口部燃焼装置であることが好ましい。
鋼管の内面に相当する側の帯鋼上側に溶融金属を注ぎかけて溶融金属めっきを施す、内面めっき実施部(例えば、内面用溶融金属めっき装置A5)と、
内面めっきの施された帯鋼を連続的に管状に冷間成形し、該鋼管に成形された帯鋼の長手方向端面接合部をシーム溶接して連続鋼管を得るための鋼管形成部(例えば、フォーミング装置A7及び溶接装置A8)と、
前記鋼管外面を溶融金属に浸漬して溶融金属めっきを施す、外面めっき実施部(例えば、外面用溶融金属めっき装置A13)と、を有する鋼管製造システムにおいて、
前記内面めっき実施部及び/又は外面めっき実施部における、溶融金属浸漬長さを調整可能であることを特徴とするシステムである。
本形態(2)は、前記内面めっき実施部(例えば、内面用溶融金属めっき装置A5)が、
帯鋼上側に溶融金属が注ぎかけられる、注ぎかけ部(例えば、注ぎかけ部501)と、
前記注ぎかけ部に溶融金属が供給可能である、溶融金属供給部(例えば、溶融金属ポンプ550)と、
前記注ぎかけ部により注ぎかけられた溶融金属を除去する内面ワイピング部(例えば、内面ワイピング部503)と、を有し、
更に、溶融金属が注ぎかけられる最初の位置と、内面ワイピング部の位置との相対距離を調節可能である、前記形態(1)のシステムである。
本形態(3)は、前記注ぎかけ部が、帯鋼の進行方向に対して平行に移動可能な移動手段(例えば、可動部504)を有する、前記形態(2)のシステムである。
本形態(4)は、前記内面ワイピング部の位置が固定されている、前記形態(1)~(3)のいずれか一つのシステムである。
本形態(5)は、前記外面めっき実施部が、
前記連続鋼管が通過する空間を有し、当該空間に溶融金属が導入されている場合には連続鋼管の外面を溶融金属に浸漬可能な、前記連続鋼管の進行方向に連続的に並べられた複数の浸漬部(例えば、浸漬部601)と、
前記浸漬部により溶融金属に浸漬された連続鋼管から余剰の金属を除去する、外面ワイピング部(例えば、ワイピング部602)と、
前記浸漬部内に溶融金属を供給可能な溶融金属供給部(例えば、溶融金属ポンプ550)と、を有し、
前記溶融金属供給部が、溶融金属を供給する浸漬部の個数を変化させて供給することが可能である、前記形態(1)~(4)のいずれか一つのシステムである。
本形態(6)は、前記外面ワイピング部が、前記複数の浸漬部の各々の直後に設置されており、
当該複数のうち何れのワイピング部を稼動させるのかを決定することが可能である、前記形態(5)のシステムである。
本形態(7)は、前記浸漬部間に設置されている前記外面ワイピング部が、
前記連続鋼管を囲む環状部(例えば、環状部60201)と、
前記環状部の内側に形成された複数の気体噴出孔(例えば、気体噴出孔60202)と、を有し、
前記環状部が開環して、前記連続鋼管から離れた位置に移動可能な開環可動式ワイピング部(例えば、開環可動式ワイピング部602-1)である、本形態(6)のシステムである。
(実施例1)
図8に示す、加熱装置10を備えた溶融金属めっき炉100を使用して、鉄釜101の内部の亜鉛浴槽内で亜鉛を溶融し、浴槽内中央部での制御温度を450℃とし、均熱時の亜鉛浴槽内(めっき浴槽)内の5箇所(a,b,c,d,e)で溶融亜鉛の温度を測定した(当該制御温度は、cを温度基準点として温度制御を行った)。この各箇所の測定温度における最小温度と最大温度をグラフにプロットした(図10(a)に図示)。なお、この金属めっき炉の加熱装置10は、燃焼により生じた燃焼ガス分子が保有する運動エネルギーを衝突、振動させて熱エネルギーへ転化することができる特定の加熱方式を採用した加熱装置である。
図9に示す金属めっき炉200を使用した以外は実施例と同様にして溶融亜鉛の温度を測定した。すなわち、鉄釜201の内部の亜鉛浴槽内で亜鉛を溶融し、制御温度450℃とし、均熱時の亜鉛浴槽内(めっき浴槽)内の5箇所(a,b,c,d,e)で溶融亜鉛の温度を測定した。この各箇所の測定温度における最小温度と最大温度をグラフにプロットした(図10(b)に図示)。なお、この金属めっき炉の加熱装置210は従来のバーナーである。
すなわち、本発明に係る特定の加熱方式を採用した加熱装置を具備する溶融金属めっき炉は、めっき炉内の温度ばらつきが少なく、温度制御性に優れている。また、鉄釜内側の亜鉛との接触部の合金化が抑えられ、ドロスの発生を抑制することができる。これは、ドロス不純物低減によるめっき品質の向上に繋がり、また、定期的なドロス汲み上げ作業の削減にも繋がって作業効率の向上を実現できる。
100 溶融金属めっき炉
101 めっき浴槽
200 従来の溶融金属めっき炉
201 めっき浴槽
202 内壁
203 耐熱性外壁
204 加熱室
210 従来のバーナー
A1:コイル
A2:アンコイラー
A3:ショットブラスト装置
A4:前処理装置
A5:内面用溶融金属めっき装置
A6:第一冷却槽
A7:フォーミング装置
A8:溶接装置
A9:管状体
A10:切削装置
A11:フラックス塗布装置
A12:予備加熱装置
A13:外面用溶融金属めっき装置
A14:第二冷却槽
A15:サイジング装置
A16:切断装置
Claims (49)
- めっき浴槽、該めっき浴槽の外側に配置された内壁、略矩形状の耐熱性外壁、および、該内壁と該耐熱性外壁とで囲まれてなる加熱室を有し、かつ、前記耐熱性外壁の少なくとも1箇所に加熱装置を備える溶融金属めっき炉であり、
前記加熱装置が、
中心軸(14)を中心にして整然と延びている燃焼室(12)であって、該燃焼室(12)の軸方向に延びている壁(26、64、66)の少なくとも一部に、該燃焼室(12)に沿った共通の燃焼領域へと燃料および空気を排出するように面する燃料充てん開口部(28.1)の配列(22)および空気充てん開口部(28.2)の配列(24)が形成されており、前記燃料充てん開口部(28.1)のサイズが、前記空気充てん開口部(28.2)のサイズに対して効果的な燃焼反応を達成するための適切な関係にある燃焼室(12)と、
燃焼後の媒体の排出速度を加速するための徐々に狭くなる燃焼後媒体排出部(16)と、
前記燃料充てん開口部配列(22)および前記空気充てん開口部配列(24)へとそれぞれ開いており、各々を燃料または空気のいずれかであるそれぞれの媒体の供給源へと接続することができる燃料供給部(20)および空気供給部(18)と
を備えており、
使用時に、前記燃焼室(12)を、可燃混合物に点火するための点火手段(34)へと曝すことができる燃焼装置(10)であって、
少なくとも一方の開口部配列(22、24)の少なくとも大部分の開口部(28)の開口部有効断面サイズを、適切な媒体充てん開口部配列(22、24)の程度を調節するための調節機構(30、44、46、48、58、68、70、76)によって制御可能に調節することができ、両方の開口部配列のサイズが調節可能である場合には、それらの配列の別個独立な調節が可能な加熱装置である
ことを特徴とする溶融金属めっき炉。 - 前記加熱装置における前記配列(22、24)の個々の前記開口部(28)が、少なくとも大部分の空気充てん開口部(28.2)の中心軸(40)が、前記中心軸(14)に一致する前記燃焼室(12)の長手方向の中心(14、42)において、対応する燃料充てん開口部(28.1)の中心軸(38)と交差するように配置可能であることを特徴とする請求項1に記載の溶融金属めっき炉。
- 前記加熱装置における前記媒体充てん開口部配列(22、24)の各々が、同数の開口部(28)を有していることを特徴とする請求項1または2のいずれか1項に記載の溶融金属めっき炉。
- 前記加熱装置における前記配列(22、24)の前記開口部(28)が、一定の間隔で位置していることを特徴とする請求項1~3のいずれか1項に記載の溶融金属めっき炉。
- 前記加熱装置における前記配列(22、24)の前記開口部(28)が、行および列において間隔を空けて位置していることを特徴とする請求項1~4のいずれか1項に記載の溶融金属めっき炉。
- 前記加熱装置において、すべての開口部(28)の中心軸(38、40)が、前記燃焼室(12)の前記長手方向の中心(14、42)に対して同じ角度で当該加熱装置の排出方向に傾けられていることを特徴とする請求項2~5のいずれか1項に記載の溶融金属めっき炉。
- 前記加熱装置における前記調節機構(30、44、46、48、58、68、70、76)が、前記少なくとも1つの調節可能な媒体充てん開口部配列(22、24)のためのカバー手段(30、44、58、68、70)を備えており、
前記カバー手段に、前記媒体充てん開口部配列(22、24)に一致するカバー手段開口部配列(32、72、74)が形成され、
前記カバー手段開口部配列が、互いにぴったりと位置する前記カバー手段と前記燃焼室(12)の前記媒体充てん配列を呈する壁(26、64、66)との相対の平行移動に応じて、少なくとも開口部が大きくなる位置合わせの状態と開口部が絞られる位置合わせの状態との間で調節可能に協働することで、当該加熱装置の使用時に前記燃焼室への媒体の流れが調節されることを特徴とする請求項1~6のいずれか1項に記載の溶融金属めっき炉。 - 前記加熱装置における前記燃焼室(12)が、前記媒体充てん開口部配列(22、24)を互いに直面させるように構成されていることを特徴とする請求項1~6のいずれか1項に記載の溶融金属めっき炉。
- 前記加熱装置における前記燃焼室(12)が、中心軸(14)に沿って中央を延びる媒体充てんチャンバ(α)の周囲に環状に形成されることで、燃焼室(12)の長手方向の中心(42)が燃焼室(12)内の中央を環状に延び、結果として前記媒体充てん開口部配列(22、24)が燃焼室の長手方向の内側および外側側壁を定める向かい合う周状の壁(26.1、26.2)に沿って延び、前記媒体充てんチャンバ(α)の内側端が適切に塞がれていることを特徴とする請求項8に記載の溶融金属めっき炉。
- 前記加熱装置において、少なくとも1つの媒体充てん配列(22、24)の開口部サイズを、前記媒体充てんチャンバ(α)の内側または長手方向に延びて燃焼室を囲んでいる外側の壁(26.2)の外側において、燃焼室を定めている壁(26)の燃焼室から遠い方の表面に沿ってスライド変位可能に取り付けられた円筒形のカバー本体(30、44、58)の形態のカバー手段(30)に応じて、調節することができることを特徴とする請求項9に記載の溶融金属めっき炉。
- 前記加熱装置において、カバー本体(44、58)が、当該加熱装置の中心軸(14)の方向に制御可能に変位させることができるように取り付けられていることを特徴とする請求項10に記載の溶融金属めっき炉。
- 前記加熱装置において、両方の媒体充てん開口部配列(22、24)を、開口部が円筒形のカバー本体(44、58)によって調節することができることを特徴とする請求項11に記載の溶融金属めっき炉。
- 前記加熱装置における前記燃料供給部(20)および前記空気供給部(18)が、一方が燃焼室の長手方向の壁(26.1)の内側を延びており、他方が燃焼室の外側の壁(26.2)に沿って延びている適切に補充することができる充てんチャンバの形態であることを特徴とする請求項9~12のいずれか1項に記載の溶融金属めっき炉。
- 前記加熱装置における前記燃料充てんチャンバ(20)が、前記燃焼室(12)の内側に位置し、前記空気充てんチャンバ(18)が、前記燃焼室(12)の外側に沿って位置していることを特徴とする請求項13に記載の溶融金属めっき炉。
- 前記加熱装置において、内側端が適切に塞がれている前記燃焼室(12)が、前記中心軸(14)に沿って延び、長手方向の中心(42)を定めており、
前記調節機構(30、44、68、70、76)が、少なくとも1つの媒体充てん開口部配列(22、24)と調節可能に協働して該少なくとも1つの媒体充てん開口部配列の開口部サイズを調節するカバー手段の形態である場合に、前記燃焼室(12)の適切な長手方向の壁(26、64、66)の外面にスライド可能に取り付けられていることを特徴とする請求項8に記載の溶融金属めっき炉。 - 前記加熱装置における前記燃料供給部(20)および前記空気供給部(18)が、前記燃焼室の側壁(64、66)の傍らを広がる適切に補充することができる充てんチャンバの形態であることを特徴とする請求項15に記載の溶融金属めっき炉。
- 前記加熱装置における前記燃焼室(12)が、少なくとも一部に媒体充てん開口部(28)が形成された平坦な側壁で形成されていることを特徴とする請求項15または16に記載の溶融金属めっき炉。
- 前記加熱装置における前記カバー手段(30、68、70)が、前記燃焼室の中心軸(14)の方向にストッパ間を変位させられるように取り付けられた開口部付きの少なくとも1枚のカバー板(68、70)の形態であることを特徴とする請求項17に記載の溶融金属めっき炉。
- 前記加熱装置における前記燃焼室(12)が、矩形の形状であることを特徴とする請求項17に記載の溶融金属めっき炉。
- 前記加熱装置において、前記燃焼室の向かい合う2つの側壁(68、70)に媒体充てん開口部(28)が形成され、すなわち一方に空気充てん開口部が形成され、他方に燃料充てん開口部が形成されていることを特徴とする請求項18に記載の溶融金属めっき炉。
- 前記加熱装置において、前記空気充てん開口部配列(24)および前記燃料充てん開口部配列(22)の両方を、開口部が適当に設けられたカバー板(68、70)によって調節することができることを特徴とする請求項18~20のいずれか1項に記載の溶融金属めっき炉。
- 請求項1~21のいずれか1項に記載の溶融金属めっき炉を用いて、めっき製品を形成することを特徴とするめっき製品の製造方法。
- 前記溶融金属めっき炉におけるめっき浴槽内の温度のばらつきが20℃以内であることを特徴とする請求項22に記載のめっき製品の製造方法。
- 金属めっき製品の製造システムであって、
前記製造システムは、被めっき処理物に溶融金属めっきを施すめっき実施部を少なくとも一つ有し、
前記めっき実施部の少なくとも一つは、めっき浴槽と、めっき浴槽を加熱するための加熱装置を有し、
前記加熱装置が、
中心軸(14)を中心にして整然と延びている燃焼室(12)であって、該燃焼室(12)の軸方向に延びている壁(26、64、66)の少なくとも一部に、該燃焼室(12)に沿った共通の燃焼領域へと燃料および空気を排出するように面する燃料充てん開口部(28.1)の配列(22)および空気充てん開口部(28.2)の配列(24)が形成されており、前記燃料充てん開口部(28.1)のサイズが、前記空気充てん開口部(28.2)のサイズに対して効果的な燃焼反応を達成するための適切な関係にある燃焼室(12)と、
燃焼後の媒体の排出速度を加速するための徐々に狭くなる燃焼後媒体排出部(16)と、
前記燃料充てん開口部配列(22)および前記空気充てん開口部配列(24)へとそれぞれ開いており、各々を燃料または空気のいずれかであるそれぞれの媒体の供給源へと接続することができる燃料供給部(20)および空気供給部(18)と
を備えており、
使用時に、前記燃焼室(12)を、可燃混合物に点火するための点火手段(34)へと曝すことができる燃焼装置(10)であって、
少なくとも一方の開口部配列(22、24)の少なくとも大部分の開口部(28)の開口部有効断面サイズを、適切な媒体充てん開口部配列(22、24)の程度を調節するための調節機構(30、44、46、48、58、68、70、76)によって制御可能に調節することができ、両方の開口部配列のサイズが調節可能である場合には、それらの配列の別個独立な調節が可能な加熱装置である
ことを特徴とするシステム。 - 前記加熱装置における前記配列(22、24)の個々の前記開口部(28)が、少なくとも大部分の空気充てん開口部(28.2)の中心軸(40)が、前記中心軸(14)に一致する前記燃焼室(12)の長手方向の中心(14、42)において、対応する燃料充てん開口部(28.1)の中心軸(38)と交差するように配置可能であることを特徴とする請求項24に記載のシステム。
- 前記加熱装置における前記媒体充てん開口部配列(22、24)の各々が、同数の開口部(28)を有していることを特徴とする請求項24または25のいずれか1項に記載のシステム。
- 前記加熱装置における前記配列(22、24)の前記開口部(28)が、一定の間隔で位置していることを特徴とする請求項24~26のいずれか1項に記載のシステム。
- 前記加熱装置における前記配列(22、24)の前記開口部(28)が、行および列において間隔を空けて位置していることを特徴とする請求項24~27のいずれか1項に記載のシステム。
- 前記加熱装置において、すべての開口部(28)の中心軸(38、40)が、前記燃焼室(12)の前記長手方向の中心(14、42)に対して同じ角度で当該加熱装置の排出方向に傾けられていることを特徴とする請求項25~28のいずれか1項に記載のシステム。
- 前記加熱装置における前記調節機構(30、44、46、48、58、68、70、76)が、前記少なくとも1つの調節可能な媒体充てん開口部配列(22、24)のためのカバー手段(30、44、58、68、70)を備えており、
前記カバー手段に、前記媒体充てん開口部配列(22、24)に一致するカバー手段開口部配列(32、72、74)が形成され、
前記カバー手段開口部配列が、互いにぴったりと位置する前記カバー手段と前記燃焼室(12)の前記媒体充てん配列を呈する壁(26、64、66)との相対の平行移動に応じて、少なくとも開口部が大きくなる位置合わせの状態と開口部が絞られる位置合わせの状態との間で調節可能に協働することで、当該加熱装置の使用時に前記燃焼室への媒体の流れが調節されることを特徴とする請求項24~29のいずれか1項に記載のシステム。 - 前記加熱装置における前記燃焼室(12)が、前記媒体充てん開口部配列(22、24)を互いに直面させるように構成されていることを特徴とする請求項24~29のいずれか1項に記載のシステム。
- 前記加熱装置における前記燃焼室(12)が、中心軸(14)に沿って中央を延びる媒体充てんチャンバ(α)の周囲に環状に形成されることで、燃焼室(12)の長手方向の中心(42)が燃焼室(12)内の中央を環状に延び、結果として前記媒体充てん開口部配列(22、24)が燃焼室の長手方向の内側および外側側壁を定める向かい合う周状の壁(26.1、26.2)に沿って延び、前記媒体充てんチャンバ(α)の内側端が適切に塞がれていることを特徴とする請求項31に記載のシステム。
- 前記加熱装置において、少なくとも1つの媒体充てん配列(22、24)の開口部サイズを、前記媒体充てんチャンバ(α)の内側または長手方向に延びて燃焼室を囲んでいる外側の壁(26.2)の外側において、燃焼室を定めている壁(26)の燃焼室から遠い方の表面に沿ってスライド変位可能に取り付けられた円筒形のカバー本体(30、44、58)の形態のカバー手段(30)に応じて、調節することができることを特徴とする請求項32に記載のシステム。
- 前記加熱装置において、カバー本体(44、58)が、当該加熱装置の中心軸(14)の方向に制御可能に変位させることができるように取り付けられていることを特徴とする請求項33に記載のシステム。
- 前記加熱装置において、両方の媒体充てん開口部配列(22、24)を、開口部が円筒形のカバー本体(44、58)によって調節することができることを特徴とする請求項34に記載のシステム。
- 前記加熱装置における前記燃料供給部(20)および前記空気供給部(18)が、一方が燃焼室の長手方向の壁(26.1)の内側を延びており、他方が燃焼室の外側の壁(26.2)に沿って延びている適切に補充することができる充てんチャンバの形態であることを特徴とする請求項32~35のいずれか1項に記載のシステム。
- 前記加熱装置における前記燃料充てんチャンバ(20)が、前記燃焼室(12)の内側に位置し、前記空気充てんチャンバ(18)が、前記燃焼室(12)の外側に沿って位置していることを特徴とする請求項36に記載のシステム。
- 前記加熱装置において、内側端が適切に塞がれている前記燃焼室(12)が、前記中心軸(14)に沿って延び、長手方向の中心(42)を定めており、
前記調節機構(30、44、68、70、76)が、少なくとも1つの媒体充てん開口部配列(22、24)と調節可能に協働して該少なくとも1つの媒体充てん開口部配列の開口部サイズを調節するカバー手段の形態である場合に、前記燃焼室(12)の適切な長手方向の壁(26、64、66)の外面にスライド可能に取り付けられていることを特徴とする請求項31に記載のシステム。 - 前記加熱装置における前記燃料供給部(20)および前記空気供給部(18)が、前記燃焼室の側壁(64、66)の傍らを広がる適切に補充することができる充てんチャンバの形態であることを特徴とする請求項38に記載のシステム。
- 前記加熱装置における前記燃焼室(12)が、少なくとも一部に媒体充てん開口部(28)が形成された平坦な側壁で形成されていることを特徴とする請求項15または39に記載のシステム。
- 前記加熱装置における前記カバー手段(30、68、70)が、前記燃焼室の中心軸(14)の方向にストッパ間を変位させられるように取り付けられた開口部付きの少なくとも1枚のカバー板(68、70)の形態であることを特徴とする請求項40に記載のシステム。
- 前記加熱装置における前記燃焼室(12)が、矩形の形状であることを特徴とする請求項40に記載のシステム。
- 前記加熱装置において、前記燃焼室の向かい合う2つの側壁(68、70)に媒体充てん開口部(28)が形成され、すなわち一方に空気充てん開口部が形成され、他方に燃料充てん開口部が形成されていることを特徴とする請求項41に記載のシステム。
- 前記加熱装置において、前記空気充てん開口部配列(24)および前記燃料充てん開口部配列(22)の両方を、開口部が適当に設けられたカバー板(68、70)によって調節することができることを特徴とする請求項41~43のいずれか1項に記載のシステム。
- 前記金属めっき製品が、金属めっき鋼管であることを特徴とする、請求項24~44のいずれか一項に記載の鋼管めっきシステム。
- 前記製造システムは、
帯鋼から連続製造ラインにて内外面又はいずれか一方の面に溶融金属めっきを施した鋼管を製造する鋼管製造システムであって、
鋼管の内面に相当する側の帯鋼上側に溶融金属を注ぎかけて溶融金属めっきを施す、内面めっき実施部と、
内面めっきの施された帯鋼を連続的に管状に冷間成形し、該鋼管に成形された帯鋼の長手方向端面接合部をシーム溶接して連続鋼管を得るための鋼管形成部と、
前記鋼管外面を溶融金属に浸漬して溶融金属めっきを施す、外面めっき実施部と
を備え、
前記内面めっき実施部及び/又は外面めっき実施部が、前記めっき浴槽と、前記めっき浴槽を加熱するための前記加熱装置を有することを特徴とする、請求項24~44のいずれか一項に記載の鋼管めっきシステム。 - 請求項24~46のいずれか1項に記載のシステムを用いて、鋼管めっきを形成することを特徴とする金属めっき鋼管の製造方法。
- 前記溶融金属めっき炉におけるめっき浴槽内の温度のばらつきが20℃以内であることを特徴とする請求項47に記載の金属めっき鋼管の製造方法。
- 請求項47又は48に記載の方法によって得られた鋼管であり、金属めっき層厚が4μm以下であることを特徴とする金属めっき鋼管。
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