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WO1999067562A2 - Procede et appareil de mesure pour verifier l'exactitude de la profondeur d'insertion d'un tube emmanche a la presse - Google Patents

Procede et appareil de mesure pour verifier l'exactitude de la profondeur d'insertion d'un tube emmanche a la presse Download PDF

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Publication number
WO1999067562A2
WO1999067562A2 PCT/DE1999/001833 DE9901833W WO9967562A2 WO 1999067562 A2 WO1999067562 A2 WO 1999067562A2 DE 9901833 W DE9901833 W DE 9901833W WO 9967562 A2 WO9967562 A2 WO 9967562A2
Authority
WO
WIPO (PCT)
Prior art keywords
measuring device
press fitting
pipe
press
probe
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.)
Ceased
Application number
PCT/DE1999/001833
Other languages
German (de)
English (en)
Other versions
WO1999067562A3 (fr
Inventor
Heinz Schneider
Gert Fischer
Andreas Groos
Thomas Gigowski
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.)
Vodafone GmbH
Mapress GmbH and Co KG
Original Assignee
Mannesmann AG
Mapress GmbH and Co KG
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 Mannesmann AG, Mapress GmbH and Co KG filed Critical Mannesmann AG
Priority to EP99941377A priority Critical patent/EP1088184A2/fr
Priority to AU55030/99A priority patent/AU5503099A/en
Publication of WO1999067562A2 publication Critical patent/WO1999067562A2/fr
Publication of WO1999067562A3 publication Critical patent/WO1999067562A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/06—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting or withdrawing sleeves or bearing races
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • 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
    • G01B7/26—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring depth

Definitions

  • the invention relates to a method for detecting the correct insertion depth in a pipe press connection according to the preamble of claim 1.
  • the end region of a pipe is pushed axially into the press fitting and then connected to one another in a force-fitting and positive manner by means of a press tool placed on the press fitting by means of press jaws which can be moved relative to one another.
  • the reliability of the connection between the pipe and the press fitting depends u. a. from the fact that the pipe is inserted into the press fitting by a certain minimum insertion depth.
  • the insertion depth is limited by a constriction in the press fitting.
  • the axial distance between the constriction and the end into which the tube is to be inserted is greater, the larger the diameter of the
  • Pipe end or the press fitting is.
  • the constriction forms a stop against the further axial insertion of the tube.
  • a disadvantage of this measuring method is that a medium remaining on the tube, for. B. water, fat or oil acts as a coupling agent and leads to falsified measurements. This also applies if the line is already filled with water.
  • the contact shoe required for attaching the test head is only suitable for one dimension and must therefore be replaced when the dimension changes.
  • the US test head cannot be made sufficiently small to be placed in a pressing device.
  • the known measuring method is also dependent on the angle and pressure at which the test head is placed and thus dependent on the handling of the test person.
  • the invention has for its object to develop a method and a measuring device that detects the correct insertion depth for a large size range with high reliability and easy handling and is almost independent of the subjective handling of the test person.
  • the core of the invention is the insonification of eddy current of a suitable frequency into the connection and the conversion of the received signal into a good-bad display.
  • This method takes advantage of the fact that when the insertion depth is correct, there is a double wall in the connection area, namely the wall of the fitting and the wall of the inserted pipe.
  • the constriction for the pipe to be inserted can be clearly recognized from the outside by means of the constriction.
  • the insonation point can be derived from this, since if the tube is inserted properly, the end region of the tube can only be pushed as far as the stop point. A little bit further away, there must be a double wall when properly inserted.
  • the pipe has only been pushed in just behind the sealing ring or has been pulled out a little when initially inserted properly due to a length compensation of the line, then there is only a single wall in the area of the previously described insonification point.
  • the advantage of the measuring method used according to the invention is that if the frequency is selected correctly, the parasitic effect resulting from the contour of the press fitting is perpendicular to the measuring effect.
  • a frequency in the range of 20-90 kHz, preferably 50-60 kHz has proven to be suitable.
  • Another advantage arises from the fact that the dimensions of the probe can be made so small that it can be used to test even the smallest nominal dimension of a press fitting. According to the standard, the smallest nominal dimension is 15 mm. Since the actual probe diameter is less than 5 mm, it can still be securely attached, even with the smallest nominal dimensions, despite the strong curvature of the press fitting. The larger dimensions up to 4 inches, however, pose no problems.
  • the measuring device itself can be used either in mains or battery operation. In terms of size and weight, it can be used as an easy-to-use hand-held device. Operation is very simple and only includes an on and off switch. If necessary, a button or controller is also provided for calibration. A calibration can be carried out directly on the device by placing the probe on a calibration plate arranged on the measuring device. The probe body is arranged in a spring-loaded manner in a holder, so that testing is carried out independently of the operator with the same contact pressure.
  • Figure 1 shows a half longitudinal section of a pipe press connection with proper insertion depth of the inserted pipe using the measuring method according to the invention
  • Figure 3 schematically shows a longitudinal section through the probe designed according to the invention
  • FIG. 4 shows the detail of the winding
  • Figure 6 shows the measuring circuit of the measuring device
  • a half pipe longitudinal section shows a pipe press connection with the correct insertion depth of the inserted pipe using the measuring method according to the invention.
  • the connection has a press fitting 1, which is provided at the open end with an annular bead 2 and a sealing ring 3 inserted therein.
  • the annular bead 2 is adjoined by a cylindrical section 4 which merges into a subsequent section via a section 6 which reduces the diameter.
  • This paragraph 6 forms a stop for the inserted tube 5, the end face 7 of the tube 5 comes to rest on the inside of the paragraph 6.
  • the tube 5 is properly inserted into the press fitting 1 and could be in this position with the
  • a probe 8 is attached to the outside of the press fitting 1 to check the correct insertion depth, which probes eddy current of a suitable frequency into the connection. Seen in the radial direction of sound, there is a double wall at the insonification point 10, on the one hand the wall of the cylindrical section 4 of the press fitting 1 and the underlying wall of the inserted pipe 5. The air gap 9 between the press fitting 1 and the pipe 5, which is shown here in a greatly exaggerated manner, interferes with the measurement Not. The opposite situation is shown in FIG. 2. In this case, the tube 5 has only been inserted just behind the sealing ring 3.
  • FIG. 1 A longitudinal section of the probe 8 designed according to the invention is shown in schematic form in FIG. This consists of the actual probe body 11, which is arranged in a two-part holder.
  • the holder has a cylindrical part 12 facing the body to be tested, which is screwed to a second part 13.
  • a compression spring 14 is arranged, which is supported on the one hand on a snap ring 15 attached to the probe body 11 and on the other hand on the top end face 16 of the second part 13 of the holder.
  • the first part 12 is prism-shaped 17 at the end facing the body to be tested, in order to facilitate the placement of the probe 8.
  • a cable 18 is connected to the rear of the probe body 11, which is connected to the measuring device 19
  • the winding in the probe body 11 is shown in cross section in FIG.
  • the differential winding 21 is wound around a rod-shaped metal core 20 in channels formed from plastic disks 22, 24, 24 '.
  • the field winding 23 is arranged above this.
  • Figure 5 shows another possible design.
  • FIG. 6 shows schematically the connection between the probe 8 and the measuring device 19 and the measuring circuit arranged in the measuring device 19.
  • the voltage supply 25 can take place via a mains transformer or via a rechargeable battery.
  • a generator 26 generates the measurement frequency, which is fed via an amplifier 27 to the excitation coil 23 in the probe 8.
  • the measurement signal is detected with the differential measurement winding 21 and preamplified with a controllable amplifier 30 and filtered via the high-pass filter 31.
  • a phase-controlled rectifier from components 28 and 29, and a low-pass filter 32 generate the Output voltage which allows a good and bad result by means of a reference voltage 37, a differential amplifier 33 and a window discriminator 34. The result is visualized with the displays "good” 35 or "bad" 36.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un procédé et un appareil de mesure pour vérifier l'exactitude de la profondeur d'insertion d'un tube emmanché à la presse, comportant un appareil à courant de Foucault auquel est reliée une sonde, ainsi qu'un circuit de mesure disposé dans l'appareil à courant de Foucault pour évaluer les signaux de courant de Foucault, de telle manière que se produise un signal en fonction de l'exactitude de la profondeur ou de la non-exactitude de la profondeur d'insertion. La sonde (8) présente des dimensions telles qu'elle peut se placer, avec la même pression d'appui, également sur la plus petite dimension nominale à mesurer d'un raccord emmanché (1) ou d'un élément de raccord emmanché, sans affecter le résultat de mesure. Après l'emmanchement de la zone terminale du tube dans le raccord emmanché ou dans l'élément de raccord emmanché, on fait pénétrer dans l'assemblage un courant de Foucault de fréquence appropriée dans la zone de recouvrement entre le tube et le raccord emmanché, et le signal de réception est transformé en une indication bon-mauvais, la zone d'insertion détectable de l'extérieur formant la zone de pénétration du courant.
PCT/DE1999/001833 1998-06-24 1999-06-18 Procede et appareil de mesure pour verifier l'exactitude de la profondeur d'insertion d'un tube emmanche a la presse Ceased WO1999067562A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99941377A EP1088184A2 (fr) 1998-06-24 1999-06-18 Procede et appareil de mesure pour verifier l'exactitude de la profondeur d'insertion d'un tube emmanche a la presse
AU55030/99A AU5503099A (en) 1998-06-24 1999-06-18 Method and measuring device for detecting the proper insertion depth in a pipe press-fitted connection

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19829999.0 1998-06-24
DE1998129999 DE19829999C1 (de) 1998-06-24 1998-06-24 Verfahren und Meßgerät zur Detektierung der ordnungsgemäßen Einstecktiefe in einer Rohrpreßverbindung

Publications (2)

Publication Number Publication Date
WO1999067562A2 true WO1999067562A2 (fr) 1999-12-29
WO1999067562A3 WO1999067562A3 (fr) 2000-03-02

Family

ID=7873030

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/001833 Ceased WO1999067562A2 (fr) 1998-06-24 1999-06-18 Procede et appareil de mesure pour verifier l'exactitude de la profondeur d'insertion d'un tube emmanche a la presse

Country Status (4)

Country Link
EP (1) EP1088184A2 (fr)
AU (1) AU5503099A (fr)
DE (1) DE19829999C1 (fr)
WO (1) WO1999067562A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10312458B3 (de) * 2003-03-20 2004-08-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Bestimmung des Verpressungsgrades einer formschlüssigen Verbindung zwischen wenigstens zwei Bauteilen
DE102020121128B3 (de) 2020-08-11 2021-08-05 Stefan Rauh Verfahren und Vorrichtung zur Ermittlung der Eindringtiefe eines eingeschobenen Bauteils in ein aufnehmendes Bauteil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1187870B (de) 1958-10-01 1965-02-25 Aga Plaatfoeraedling Aktiebola Plastisch verformbare metallische Kupplungshuelse zum Verbinden von Metallrohren mit glatten Enden
DE4012504C1 (fr) 1990-04-12 1991-08-14 Mannesmann Ag, 4000 Duesseldorf, De
DE29609767U1 (de) 1995-06-08 1996-10-10 Mannesmann AG, 40213 Düsseldorf Meßgerät zur Erfassung der Einschubtiefe in einer Rohrverbindung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3434046A (en) * 1965-12-20 1969-03-18 Halliburton Co Electronic borehole casing collar locator
IT1115746B (it) * 1977-11-15 1986-02-03 Siargas Procedimento per la realizzazione di giunti a tenuta stagna in condotte interrate
US4806863A (en) * 1986-10-17 1989-02-21 Westinghouse Electric Corp. Eddy current apparatus including cylindrical coil with flux concentrator for high resolution detection of flaws in conductive objects
GB8807301D0 (en) * 1988-03-26 1988-04-27 Philpot Electronics Ltd Detector
WO1996034279A1 (fr) * 1995-04-24 1996-10-31 Larsson Goeran Procede et appareil de mesure d'objets ferromagnetiques

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1187870B (de) 1958-10-01 1965-02-25 Aga Plaatfoeraedling Aktiebola Plastisch verformbare metallische Kupplungshuelse zum Verbinden von Metallrohren mit glatten Enden
DE4012504C1 (fr) 1990-04-12 1991-08-14 Mannesmann Ag, 4000 Duesseldorf, De
DE29609767U1 (de) 1995-06-08 1996-10-10 Mannesmann AG, 40213 Düsseldorf Meßgerät zur Erfassung der Einschubtiefe in einer Rohrverbindung

Also Published As

Publication number Publication date
AU5503099A (en) 2000-01-10
WO1999067562A3 (fr) 2000-03-02
EP1088184A2 (fr) 2001-04-04
DE19829999C1 (de) 2000-01-13

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