The invention relates to a device and a method for descaling a workpiece, which is in motion in relation to the device in a movement direction (X). The device (10) comprises a rotor head (14), which is rotatable about an axis of rotation (R), which is inclined diagonally at an angle () with respect to an orthogonal on a surface (20) of the workpiece (12). Furthermore, the device comprises multiple jet nozzles (16), which are attached on the rotor head (14), wherein a liquid (18), in particular water, is dispensable onto the workpiece (12) at an angle of attack () inclined to the surface (20) of the workpiece (12) from the jet nozzles (16). The jet nozzles (16) are fixedly attached on the rotor head (14) such that during rotation of the rotor head (14) about its axis of rotation (R), the spraying direction (S) of the liquid (18) dispensed from the jet nozzles (16), with respect to a projection in a plane parallel to the surface (20) of the workpiece (12), is aligned opposing, i.e., at a spraying angle () of approximately 180, the movement direction (X) of the workpiece (12).

A nozzle head for descaling rolling stock, said rolling stock moving relative to said nozzle head, is adapted to be mounted for rotation about an axis of rotation relative to a surface of said rolling stock. Said nozzle head comprises a plurality of nozzles adapted to spray a liquid on said rolling stock, wherein said nozzles are positioned at different radial distances from said axis of rotation.

A device for the application of a liquid fluid to a peripheral area of a lid using pistols for injecting said liquid fluid. The device includes an articulated mechanical device combined with at least two coaxial tubular shafts: a main supply shaft and a lower shaft, where a lower end of the main supply shaft connects to a first part of the articulated mechanical device, while a second part of the articulated mechanical device connects to a lower end of the lower shaft. The two coaxial tubular shafts rotate independently by means of transmission devices. The main supply shaft is arranged in an inner hole of the lower shaft, which is arranged coaxially around at least one section of the main supply shaft.

A paint spraying machine includes an apparatus for containing and removing the leakage of paint drops from a rotating joint, without the risk of damaging the article being sprayed, and thus without the need for downtime to replace sealing elements. The rotating joint includes a hollow shaft for distributing paint, a drum including a plurality of flanges that define separate chambers for different paints, a plurality of seals for separating the different paints in the different chambers which together form a high-pressure circuit, a low-pressure circuit to refrigerate the seals, improve their sealing and possibly intercept leaking paint, and a plurality of centering rings provide for correct assembly of the seals and the correct alignment of different flanges. The rings are hollow, and allow for the passage of the refrigerating/cleaning liquid under low pressure. A method for operating the machine includes containing and removing the leakage of paint drops from a rotating joint and distributing them back to the supplying tank of the refrigerating/ cleaning liquid.

A device for the application of a liquid fluid to a peripheral area of a lid using pistols for injecting said liquid fluid. The device includes an articulated mechanical device combined with at least two coaxial tubular shafts: a main supply shaft and a lower shaft, where a lower end of the main supply shaft connects to a first part of the articulated mechanical device, while a second part of the articulated mechanical device connects to a lower end of the lower shaft. The two coaxial tubular shafts rotate independently by means of transmission devices. The main supply shaft is arranged in glean inner hole of the lower shaft, which is arranged coaxially around at least one section of the main supply shaft.