Transducer for distance measurement
AssigneeDaprox AB
InventorsBengt Akerblom, Bengt Lofqvist
Life of this patent
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Abstract
A transducer (10) for distance measurement, especially between a stator and a rotor in a refiner for paper pulp production, in which the transducer is of the magnetic type and has a tubular casing (17), the one end of which forms a measuring head (14), in which a measuring pole (15) is fitted in a holder (16) which is mounted in the end of the casing (17) and seals this. The holder (16), with a first portion (22) of its axial length, reaches beyond the end of the casing. This first portion (22) and the measuring pole (15) are intended to be able to be worn away to a smaller axial length during use of the transducer, whilst the length of the casing is maintained.
Claims11
Transducer for distance measurement, between a stator and a rotor in a refiner for paper pulp production, in which the transducer is of the magnetic type and has a tubular casing (17) at one end of which a measuring pole (15) interacting with measuring windings (19–21) inside the casing is fixed by means of a holder (16) of non-magnetic material which seals the end of the casing, characterized in that the holder (16), with a first portion (22) of its axial length, reaches axially beyond the end of the casing (17), that this first portion (22) of the holder connects to the end of the casing (17) and at least partially covers said end, and in that this first portion (22) and the measuring pole (15) are intended to be able to be worn away to a smaller axial length during use of the transducer, whilst the length of the casing is maintained.
Transducer for distance measurement, between a stator and a rotor in a refiner for paper pulp production, in which the transducer is of the magnetic type and has a tubular casing (17) at one end of which a measuring pole (15) interacting with measuring windings (19–21) inside the casing is fixed by means of a holder (16) of non-magnetic material which seals the end of the casing, characterized in that the holder (16), with a first portion (22) of its axial length, reaches axially beyond the end of the casing (17), that this first portion (22) of the holder connects to the end of the casing (17) and at least partially covers said end, and in that this first portion (22) and the measuring pole (15) are intended to be able to be worn away to a smaller axial length during use of the transducer, whilst the length of the casing is maintained, and characterized in that the holder (16), with a second portion (23) of its axial length, extends into the casing, this second portion having a diameter essentially corresponding to the inner diameter of the casing.
Transducer for distance measurement, between a stator and a rotor in a refiner for paper pulp production, in which the transducer is of the magnetic type and has a tubular casing (17) at one end of which a measuring pole (15) interacting with measuring windings (19–21) inside the casing is fixed by means of a holder (16) of non-magnetic material which seals the end of the casing, characterized in that the holder (16), with a first portion (22) of its axial length, reaches axially beyond the end of the casing (17), that this first portion (22) of the holder connects to the end of the casing (17) and at least partially covers said end, and in that this first portion (22) and the measuring pole (15) are intended to be able to be worn away to a smaller axial length during use of the transducer, whilst the length of the casing is maintained, and characterized in that the holder (16) and the casing (17) are mutually connected by means of a joint (24) disposed around the outside of the transducer, wherein the joint is a weld joint.
Dependencies are inferred from the claim text.