CA2452843A1 - Transducer for distance measurement - Google Patents

Transducer for distance measurement Download PDF

Info

Publication number
CA2452843A1
CA2452843A1 CA002452843A CA2452843A CA2452843A1 CA 2452843 A1 CA2452843 A1 CA 2452843A1 CA 002452843 A CA002452843 A CA 002452843A CA 2452843 A CA2452843 A CA 2452843A CA 2452843 A1 CA2452843 A1 CA 2452843A1
Authority
CA
Canada
Prior art keywords
casing
holder
transducer
transducer according
axial length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002452843A
Other languages
French (fr)
Other versions
CA2452843C (en
Inventor
Bengt Akerblom
Bengt Loefqvist
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daprox AB
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2452843A1 publication Critical patent/CA2452843A1/en
Application granted granted Critical
Publication of CA2452843C publication Critical patent/CA2452843C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/14—Adjusting, applying pressure to, or controlling distance between, discs
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/002—Control devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures

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.

Claims (6)

1. Transducer 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) 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.
2. Transducer according to Claim 1, characterized in that the holder at least at the end of the casing, has a diameter essentially corresponding to the outer diameter of the casing.
3. Transducer according to Claim 2, characterized in that the first portion (22) of the holder, along the whole of its length, has the same external form as the casing (17).
4. Transducer according to any of Claims 1-3, 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.
5. Transducer according to any of Claims 1-4, 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, expediently a weld joint.
6. Transducer according to Claim 5, characterized in that on each side of the joint (24) there is disposed a circumferential groove (25, 26), one groove (25) being disposed in the holder (16) and one groove (26) being disposed in the casing (17).
CA002452843A 2001-09-26 2002-09-24 Transducer for distance measurement Expired - Lifetime CA2452843C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0103199A SE521893C2 (en) 2001-09-26 2001-09-26 Sensor for distance measurement
SE0103199-6 2001-09-26
PCT/SE2002/001734 WO2003027607A1 (en) 2001-09-26 2002-09-24 Transducer for distance measurement

Publications (2)

Publication Number Publication Date
CA2452843A1 true CA2452843A1 (en) 2003-04-03
CA2452843C CA2452843C (en) 2010-02-02

Family

ID=20285449

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002452843A Expired - Lifetime CA2452843C (en) 2001-09-26 2002-09-24 Transducer for distance measurement

Country Status (7)

Country Link
US (1) US7064536B2 (en)
EP (1) EP1430269B1 (en)
JP (1) JP4335677B2 (en)
CA (1) CA2452843C (en)
ES (1) ES2666272T3 (en)
SE (1) SE521893C2 (en)
WO (1) WO2003027607A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE528736C2 (en) * 2005-06-14 2007-02-06 Daprox Ab Method and apparatus for mounting sensors intended for distance measurement between stator and rotor
GB2455968B (en) * 2007-11-21 2010-06-09 Rolls Royce Plc Turbomachine having an apparatus to measure the clearance between a rotor blade tip and a stator liner of a stator casing
SE544564C2 (en) * 2020-08-26 2022-07-19 Daprox Ab A beating gap sensor device for a refiner apparatus and calibration method

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548599A (en) * 1948-11-02 1951-04-10 Gen Electric Clearance control
US2978599A (en) * 1957-11-20 1961-04-04 Rca Corp Indicating system
FI49194C (en) * 1971-08-27 1975-04-10 Yhtyneet Paperitehtaat Oy Pulp grinder
SE401896B (en) * 1975-03-26 1978-06-05 Pak Construction Ab DEVICE FOR INDICATING CLEARS WIDTH AND PREVENTING METALLIC CONTACT BETWEEN THOSE OPPOSITE SURFACES WITH BOOMS OR SIMILAR FITTED PAINTING ORGANES FOR EX
SE416844B (en) * 1979-06-05 1981-02-09 Sunds Defibrator SETS AND DEVICE FOR DISTANCE Saturation between two opposing surfaces of magnetically conductive material
US4820980A (en) * 1987-05-04 1989-04-11 Dodson Edgars Darryl Gap, wear and tram measurement system and method for grinding machines
US4804912A (en) * 1987-05-14 1989-02-14 Kamyr Ab Apparatus for electromagnetically measuring the distance between two opposing grinding surfaces
US5544819A (en) * 1993-06-11 1996-08-13 The Haigh Engineering Company Ltd. Rotary disintegrators
US5691636A (en) * 1993-08-25 1997-11-25 Andritz Sprout-Bauer, Inc. Probe assembly mounting for a grinding machine
DE10000272C2 (en) * 2000-01-05 2002-10-31 Hbm Mes Und Systemtechnik Gmbh Inductive distance sensor
US6502774B1 (en) * 2000-03-08 2003-01-07 J + L Fiber Services, Inc. Refiner disk sensor and sensor refiner disk
SE520322C2 (en) * 2000-03-23 2003-06-24 Daprox Ab Method and apparatus for spacing between a stator and a rotating rotor opposed thereto
US6661222B1 (en) * 2002-05-31 2003-12-09 Siemens Westinghouse Power Corporation Turbine blade clearance on-line measurement system

Also Published As

Publication number Publication date
JP4335677B2 (en) 2009-09-30
WO2003027607A1 (en) 2003-04-03
EP1430269A1 (en) 2004-06-23
SE521893C2 (en) 2003-12-16
US20040169506A1 (en) 2004-09-02
ES2666272T3 (en) 2018-05-03
SE0103199L (en) 2003-03-27
CA2452843C (en) 2010-02-02
JP2005504284A (en) 2005-02-10
SE0103199D0 (en) 2001-09-26
US7064536B2 (en) 2006-06-20
EP1430269B1 (en) 2018-01-24

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Legal Events

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EEER Examination request
MKEX Expiry

Effective date: 20220926