Abstract:
A process for electric induction heating of large billets to a tapered cross sectional heating profile by inductively scan heating the axial circumference of the large billet with a single induction coil prior to hot working the large billet in an extrusion or forging process is provided.
Abstract:
A heating roller (21) has a heating layer (22) for electromagnetic induction heating, a heat insulating layer (23), and a support layer (24) from inside to outside in this order. The support layer (24) consists of a material with a specific resistance of 1 x 10 −5 Ωm or more. Thus, despite of thinning down the heating layer (22) below the skin depth that is a thickness for an induction current to flow to make a magnetic flux penetrate through the heating layer (22) and reach the support layer (24), the support layer (24) is blocked from heating by an eddy current. Therefore, reductions in the heat capacity of the heating layer (22) and the heating of the support layer (24) are suppressed. The efficient heating of only the heating layer (22) enables a shortening in warm−up time and prevents a bearing or the like for supporting the heating roller (21) from being damaged by heat.
Abstract:
An electromagnetic induction exothermic roller (21) having, in the order from the surface, at least a release layer, induction exothermic layer (22), an elastic layer (23), and a core (24). Exothermic roller (21) is pressed by a press member (31) to form a nip portion (34) and heat up a heating subject material (11) passing through the nip portion (34). The induction exothermic layer (22) has a layer prepared by dispersing an electrically conductive filler in the base material consisting of a heat resistant resin or heat resistant rubber. For this reason, the induction exothermic layer (22) can easily deform, so that a nip portion (34) having a large width (W) can be formed. Further, the durability of the induction exothermic layer (22) against repeated bending is improved.
Abstract:
Es ist eine Galette zum Führen von zumindest einem Faden mit einem hohlzylindrischen Galettenmantel beschrieben. Der hohlzylindrische Galettenmantel ist an einem Träger durch mehrere Lager frei drehbar gelagert. Zumindest eines der Lager ist als radial wirkendes Magnetlager ausgebildet, das aus einem drehenden Teil und einem an dem Träger angebrachten stehenden Teil besteht, wobei zwischen den Teilen ein Lagerspalt gebildet ist. Das stehende Teil enthält zumindest ein Polelement mit einer Erregerwicklung. Demgegenüber ist das drehende Teil erfindungsgemäß aus zumindest einer Blechung aus einem magnetisierbaren Material ausgebildet, wobei das Polelement und die Blechung zur Führung eines magnetischen Flusses zusammenwirken.
Abstract:
An exciting coil (3) is disposed facing a rotating conductive heating roller (1), and a core (4) of a magnetic material is disposed on the rear side of the coil. The core (4) consists of a center core (5) continuous in the direction of the heating roller's (1) rotation axis and a plurality of U-shaped cores (6) disposed separated in that direction. The exciting coil (3) is supplied with a high-frequency current to heat the roller (1) by electromagnetic induction. An add-on coil (7) is wound around the U-shaped cores with the opposite ends of the coil (7) connected to an on-off means. When the on-off means is on, induction current generated in the coil (7) generates magnetic flux in a direction of offsetting the magnetic flux of the exciting coil (3) to restrict the heating of the heating roller (1). A switching of the on-off means according to the width of a passing sheet and a temperature distribution in the direction of the heating roller's (1) rotation axis can keep uniform a temperature distribution in that direction.
Abstract:
An image heating device having a predetermined heat generation rate with a low current. The device comprises a heating roller (1) having magnetism and conductivity, an exciting coil (5) opposed to the peripheral face of the heating roller (1) and adapted for allowing the heating roller (1) to produce heat with electromagnetic induction. The exciting coil (5) is composed of a bundle of sixty copper wires of a 0.2 mm diameter are extended toward the rotary shaft of the heating roller (1) and they are circumferentially wound along the circumferential direction of the heating roller (1). The bundled wires are arranged in close contact to each other in the circumferentially direction of the heating roller (1) so as to cover the upper half of the heating roller (1).
Abstract:
The invention relates to a godet roll for conveying and working filaments comprising a rotating, cylindrical or circular heating roll (11) configured as a hollow cylinder. Said godet roll is equipped to measure the temperature of the heating roll (11). To this end, a magnet (31) is mounted on the hollow cylinder of the heating roll (11). A sensor (32, 32') for measuring the magnetic field of the magnet (31) is accommodated outside or inside the heating roll (11). The magnet (31) field that is influenced by the temperature of the heating roll (11) is measured and evaluated as a reference value for the actual temperature of the heating roll (11).
Abstract:
In order to prevent the vibrations generated by the rotation of a galette from being transmitted to a galette-heating inductor (16), the inductor (16) is mounted on a vibration damper (27) so as to be free from vibrations. The vibration damper (27) is arranged between the flange (9) of a supporting cylinder (18) for supporting the inductor (16) and a front wall (32) of the housing. An additional vibration damper ring (30) is provided inside of a centering ring (24) in order to radially dampen the inductor (16). The flange (9) is pressed by screws (26) against the vibration damper (27). A pressure spring (25) arranged between the screw (26) and the flange (9) presses against the flange (9).
Abstract:
A support frame for an electrical transformer assembly, comprising two loop-shaped parts, each loop-shaped part having a plurality of limbs, each limb having a peripheral recessed portion in which a primary electrical coil is mountable, and at least one secondary coil is mountable in piggyback on the primary electrical coil, one limb of each loop-shaped part having a straight section. The frame also includes an adjustable attaching means for attaching one of the loop-shaped parts with respect to the other loop-shaped part and adjusting a distance therebetween, so that only the straight sections are adjacent and form a central leg, the central leg being for receiving a magnetic core distinct from the attaching means. The frame provides a means and a method to efficiently secure adjacent windings in a circular core transformer kernel.