What is provided is a novel and improved dross removal device capable of more efficiently collecting a bath surface dross using a dross robot, and a dross removal method.

In order to solve the problem, according to an aspect of the present invention, there is provided a dross removal device including: a dross robot that is configured to collect a bath surface dross present on a bath surface of a coating bath; a dross sensor that is configured to measure an intensity of infrared light from the bath surface of the coating bath; a dross sensor control device that is configured to specify a position of the bath surface dross according to a temporal change amount in the intensity of the infrared light; and a dross robot control device that is configured to cause the dross robot to collect the bath surface dross at the position specified by the dross sensor control device.

A metal strip stabilization apparatus includes: a displacement measurement unit configured to measure a displacement of a metal strip during traveling in a non-contact manner; a control unit configured to generate a vibration suppression signal and a position correction signal based on a measurement signal; and an electromagnet unit including: a vibration suppression coil configured to generate a first magnetic force based on the vibration suppression signal; a position correction coil configured to generate a second magnetic force based on the position correction signal; and a core about which the vibration suppression coil and the position correction coil are wound concentrically, the core leading the first magnetic force.

Equipment for the continuous hot dip-coating of a metal strip 9 including an annealing furnace, a tank 2 containing a liquid metal bath 3, a snout connecting the annealing furnace and tank 2, through which the metal strip 9 runs in a protective atmosphere and the lower part of the snout, the sabot 5, is at least partly immersed in the liquid metal bath 3 in order to define with the surface of the bath, and inside this snout, a liquid seal 6, an overflow 7 not connected to the snout, the overflow 7 including at least one tray 8, placed in the vicinity of the strip 9 when entering the liquid metal bath 3 and encompassed by liquid seal 6.

A shape measurement device for a metal plate includes a plurality of distance sensors including one or more first sensors disposed on a first side and a plurality of second sensors disposed on a second side, of the metal plate with respect to a thickness direction of the metal plate, across a pass line of the metal plate. The one or more first sensors are positioned, with respect to a width direction of the metal plate, between a pair of second sensors disposed adjacent to each other in the width direction.

A warpage correction apparatus for a metal strip to be used in a continuous plating facility for the metal strip includes a sink roll disposed downstream of a fixed roll, configured to change the conveying direction of the metal strip, with respect to a conveying direction of the metal strip and inside a molten metal pot for plating, and a correction roll disposed between the fixed roll and the sink roll and configured to correct warpage of the metal strip. A ratio D3/D1 of a diameter D3 of the sink roll to a diameter D1 of the fixed roll is not less than 1.5.

A wiping device 14 includes a pair of wiping nozzles 141, a nozzle mask 142, a rotating pin 1431a, a holding portion 1431b, and an arm portion 1432. The pair of wiping nozzles 141 is disposed such that nozzle ports 141a face each other, the nozzle mask 142 is disposed at both ends of the nozzle ports 141a of the wiping nozzles 141, the rotating pin 1431a is connected to an upper portion of the nozzle mask 142, the holding portion 1431b holds the rotating pin 1431a, the arm portion 1432 fixes the holding portion 1431b from above, and the rotating pin 1431a is rotatable around an axis and adjusts the position of the nozzle mask 142.

A continuous hot-dip plating machine includes: a sink roll provided in a plating bath and configured to upwardly change a transfer direction of the steel strip; a first support roll provided in the plating bath and located above the sink roll, the first support roll being in contact with a first surface of the steel strip in contact with the sink roll; and a second support roll provided in the plating bath and located above the first support roll, the second support roll being in contact with a second surface of the steel strip opposite the first surface. A diameter of the first support roll, a diameter of the second support roll, and a vertical distance between a rotation axis of the first support roll and a rotation axis of the second support roll satisfy specific conditions.

A device minimizes or eliminates surface flaws caused by metal dust on a metal strip to be coated in a continuous hot-dip coating process, where at least some segments of the metal strip to be coated are conveyed through the device in an axial direction. The device may comprise a blowing/sucking unit with blow-in openings for applying protective gas to the metal strip, which blow-in openings are positionable on first and second sides of the metal strip. The blowing/sucking unit may further include suction openings for extracting protective gas laden with metal vapor and/or metal dust, which suction openings are positionable on the first and second sides of the metal strip. The blowing/sucking unit may have a blow-in region in which the blow-in openings are arranged, and a suction region downstream of the blow-in region in which the suction openings are arranged.

[Problem] To enable to stabilize the coating weight of the molten metal on the steel strip.

[Solution] There is provided a method for manufacturing a gas wiping nozzle provided with a pair of lip parts provided facing each other and a slit formed as a gas ejection port between the pair of lip parts and blowing a gas from the slit against a steel strip pulled up from a plating bath so as to adjust a thickness of a molten metal film deposited on a surface of the steel strip, which method for manufacturing a gas wiping nozzle comprising a fitting step of fitting fitting projections provided at one lip part with fitting holes provided at another slip part and a fastening step of fastening the pair of lip parts together in the fitted state where the fitting projections are fitted with the fitting holes, two pairs of the fitting projections and the fitting holes provided separated by a distance in a width direction of the steel strip, relative movement between the pair of lip parts in a thickness direction of the steel strip restricted in the fitted state, the distance between the fitting projections and the fitting holes in the thickness direction of the steel strip satisfying the predetermined condition.

A method of manufacturing a hot dip coated steel strip, wherein coating takes place by leading the strip through a bath of molten metal including Al, the remainder of the metal being Zn, inevitable impurities and optionally a maximum of 0.3% of one or more additional elements, wherein the composition of the bath is controlled so as to have an aluminium content of more than 0.50%.