EP2251154B1 - Support électromagnétique avec surveillance de la résistance - Google Patents

Support électromagnétique avec surveillance de la résistance Download PDF

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Publication number
EP2251154B1
EP2251154B1 EP10157835A EP10157835A EP2251154B1 EP 2251154 B1 EP2251154 B1 EP 2251154B1 EP 10157835 A EP10157835 A EP 10157835A EP 10157835 A EP10157835 A EP 10157835A EP 2251154 B1 EP2251154 B1 EP 2251154B1
Authority
EP
European Patent Office
Prior art keywords
electromagnet
test phase
magnetic
holding force
safety device
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.)
Not-in-force
Application number
EP10157835A
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German (de)
English (en)
Other versions
EP2251154A1 (fr
Inventor
Martin Beichter
Rudolf Stoppel
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.)
C&E Fein GmbH and Co
Original Assignee
C&E Fein GmbH and Co
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 C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
Publication of EP2251154A1 publication Critical patent/EP2251154A1/fr
Application granted granted Critical
Publication of EP2251154B1 publication Critical patent/EP2251154B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
    • B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
    • B25H1/0021—Stands, supports or guiding devices for positioning portable tools or for securing them to the work
    • B25H1/0057—Devices for securing hand tools to the work
    • B25H1/0064—Stands attached to the workpiece
    • B25H1/0071—Stands attached to the workpiece by magnetic means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/16—Cutting by use of rotating axially moving tool with control means energized in response to activator stimulated by condition sensor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/16—Cutting by use of rotating axially moving tool with control means energized in response to activator stimulated by condition sensor
    • Y10T408/17—Cutting by use of rotating axially moving tool with control means energized in response to activator stimulated by condition sensor to control infeed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/21—Cutting by use of rotating axially moving tool with signal, indicator, illuminator or optical means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/55—Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
    • Y10T408/554—Magnetic or suction means

Definitions

  • the invention relates to a Magnetbohrst only with a drilling unit, in particular for core hole drilling, with an electromagnet for fixing the Magnetbohrst sections to a component, with a voltage source which is coupled to the electromagnet, and with a safety device for monitoring the holding force of the electromagnet, wherein the safety device a Having means for monitoring the current strength of the electromagnet to derive therefrom a signal for a sufficient Magnethaltehraft or for a fault condition.
  • the invention further relates to a method for monitoring the holding force of an electromagnet in such a magnetic drill stand.
  • a magnetic drill stand and such a method are from the JP 571 027 09 A (Patent Abstracts of Japan).
  • the holding force of an electromagnet is monitored at a Magnetbohrst selected by a magnetic sensor device containing a hole element, a constant current source, resistors and a comparator circuit.
  • the comparator circuit has resistors and a computing unit to monitor the magnetic holding force.
  • the electromagnet is turned on, the magnetic drill stand is held magnetically on a component. If the magnetic holding force is insufficient, a warning signal is output via the comparator circuit so that the drilling unit can not be actuated.
  • a magnetic drilling machine in which a switch is provided which monitors a displacement of the drill stand on a component.
  • the switch may be a mercury switch, a vibration switch or the like.
  • the circuit for drilling operation is interrupted when no current flows in the DC circuit of the electromagnet. Switching on is only possible when current flows through the electromagnet.
  • Such a safety device is considered to be insufficient to ensure a sufficient holding force of the electromagnet in all operating conditions, since it is only monitored whether the solenoid is actually turned on or not.
  • a switch responding to the magnetic flux of the electromagnet shuts off the power for the drilling operation when a certain magnetic flux density is undershot.
  • the switch used is a reed switch. This is located near the electromagnet so that it is affected when the magnet is energized.
  • the invention has for its object to provide a Magnetbohrst provided, in which a simple and reliable monitoring of the magnetic holding force of the electromagnet is ensured. Furthermore, a suitable method for monitoring the holding force of an electromagnet in a magnetic drill stand is to be specified.
  • the safety device generates a signal for a sufficient magnetic holding force, if within a test phase, the current of the electromagnet is at least two predetermined times after the start of the test phase below a respective predetermined limit.
  • the invention is further achieved by a method of monitoring the holding force of an electromagnet in a magnetic drill stand, in which the current strength of the electromagnet is monitored to derive therefrom a signal for a sufficient magnetic holding force or for a fault condition, wherein generates a signal for a sufficient magnetic holding force if, during a test phase the current of the electromagnet is at least at two predetermined times after the start of the test phase below a respective predetermined limit value.
  • the magnetic holding force only increases gradually up to the maximum holding force within a certain period of time. Furthermore, it has been recognized that this fact can be monitored by the current flow of the electromagnet and that certain points in time can be selected, for which only a certain maximum current intensity may be present, so as to be able to decide whether the magnetic flux density is sufficient.
  • the current intensity through the electromagnet after switching on the DC voltage depends in particular on the size of the air gap between the electromagnet and the component, on the surface condition of the component and on the magnetic properties of the (ferromagnetic) component.
  • the current intensity of the electromagnet rises relatively slowly after switching on the DC voltage up to the nominal current of the electromagnet.
  • the air gap is too large, for example, there will be an increase in the current over time, but the increase over time will be much too rapid and the rated current of the electromagnet will be reached too quickly.
  • this phenomenon is exploited by monitoring the current at various times after switching on the electromagnet, in order to monitor a sufficient magnetic holding force of the electromagnet in a relatively simple and very reliable manner.
  • the safety device comprises a display for signaling a fault condition for a user.
  • a display for signaling a fault condition for a user.
  • This may be, for example, an optical, and / or acoustic and / or a haptic display (eg by vibrations).
  • activation of the drilling unit can only be allowed if no fault condition is detected.
  • the electromagnet is at least partially demagnetized in a pre-demagnetization phase preceding the test phase, before a DC voltage is applied in the test phase.
  • This measure has the advantage that the effects of the magnetic hysteresis are reduced as a result of demagnetization before the start of the test phase, so that regardless of the previous residual magnetization of the electromagnet from a previous workflow always consistent conditions exist to precisely monitor the magnetic holding force in the test phase can.
  • the electromagnet can be acted upon in the demagnetization phase with a DC voltage of alternating polarity or with an AC voltage.
  • the safety device generates when at the end of 30% of a predetermined duration of the test phase, the current through an electromagnet has reached at most 85% of the rated current of the electromagnet and at the end of 43% of the duration of the test phase at most 95% of Rated current of the electromagnet has reached, a signal for a sufficient magnetic holding force.
  • the safety device If the current intensity is above at least one of the predetermined times within the test phase above a predetermined limit, then generates according to an embodiment of the invention, the safety device when the current of the electromagnet at least two later times within the test phase is below predetermined limits, a Signal for a sufficient magnetic holding force.
  • the safety device preferably generates a signal for a sufficient magnetic holding force if the current intensity of the electromagnet is below given limit values at least two consecutive, later times within the test phase.
  • the safety device generates a signal for a fault condition, when the current decreases after the test phase in a working phase below a predetermined limit.
  • the safety device can detect a fault condition, for example, and possibly switch off the drilling unit if the current intensity has expired after the end of the test phase in the working phase falls below a predetermined limit, which corresponds to 50% of the rated current of the electromagnet.
  • this may be e.g. 50% of the rated current or another value, e.g. 70% of the rated current
  • the test phase must be sufficiently long in order to ensure reliable monitoring of the current of the electromagnet during the test phase. It has been found that for this purpose a duration of 700 to 800 milliseconds, preferably of about 720 to 750 milliseconds, is generally sufficient.
  • the demagnetization phase which preferably precedes the test phase, may for example have a duration of 700 to 1000 milliseconds, preferably of 800 to 900 milliseconds.
  • the electromagnet is preferably subjected to a DC voltage of alternating polarity or to an AC voltage in a demagnetization phase preceding the test phase.
  • a signal for a sufficient magnetic holding force is generated when the current strength of the electromagnet is at least two later times within the test phase each below predetermined limits, the two later times are preferably consecutive, later times.
  • a magnetic drill stand according to the invention is shown in simplified form and designated overall by the numeral 10. This is a core hole drilling machine in the present case.
  • the magnetic drill stand 10 has a base 16, at the lower end of which an electromagnet 14 is provided. At the front, in the present case vertically arranged end of the base 16, a guide 18 is provided, along which a drilling unit 20 is movable, as indicated by the double arrow 22. On the drilling unit 20, a drill spindle 24 is provided, on which a tool 26 is clamped, which may be, for example, a core drill.
  • the magnetic drill stand 10 is held by the magnetic field of the electromagnet 14 on a component 12 when the electromagnet 14 is switched on.
  • a component 12 must necessarily be a ferromagnetic component, for example made of steel, in order to ensure a sufficient magnetic force.
  • the illustration shown here with a horizontal component surface is only an example and that the component can be arranged in all possible directions, for example, it may be a steel beam, which is arranged vertically or around a steel beam, which is arranged horizontally is and below which the magnetic drill stand is fixed from below by means of the electromagnet 14.
  • core holes are introduced into the component 12 itself.
  • the current strength of the electromagnet is monitored at different points in time when it is subjected to a DC voltage in order to monitor the magnetic holding force.
  • Fig. 2 the voltage-time profile when switching on a DC voltage source for the electromagnet 14 is shown schematically and designated by the numeral 30.
  • the voltage U increases virtually abruptly up to the rated voltage. This results in an approximately rectangular course of the curve 30.
  • the result of the magnetic hysteresis is only a gradual increase of the magnetization and thus also of the current intensity of the electromagnet.
  • the magnetization of the component and thus the current of the electromagnet may develop differently in time.
  • the curve 34 in Fig. 3 indicates a typical course of the current of the electromagnet 14, which results when the electromagnet ensures a high magnetization of the component within a short time.
  • the curves 33 and 32 indicate in comparison to current waveforms in which the magnetization of the component is not sufficient to ensure a sufficient magnetic holding force. This is shown by a significantly steeper course of the curve.
  • this phenomenon is exploited to make a decision by monitoring the current strength of the electromagnet at predetermined times, whether the magnetic holding force of the magnetic drill stand is auseichend to ensure safe working.
  • FIG. 4 One possible implementation is in Fig. 4 shown.
  • a demagnetization with the duration T E is carried out beforehand.
  • the preceding demagnetization phase ensures that, regardless of the previous magnetization of the magnetic drill stand, the test phase is always carried out with constant initial conditions.
  • the electromagnet 14 is subjected to a DC voltage of alternating polarity in the demagnetization phase, so that the magnetization at the end of the demagnetization phase T E is almost zero.
  • the DC voltage is subsequently switched on, virtually no remnant magnetization is thus present, so that approximately a new curve results.
  • a previously existing remanence is largely eliminated by the demagnetization, so that in any case there are objective conditions in the review of the current of the electromagnet.
  • the demagnetization phase T E can, for example, have a duration of 840 milliseconds and the test phase T test immediately following it can have a duration of 736 milliseconds. If the test phase goes through positively, this is followed by a working phase Tw, within which work is carried out with the drilling unit 20, for example to produce a bore in the component 12.
  • the magnetic drill stand further comprises a signal generator 29 coupled to the safety device 28 which visually and / or acoustically indicates a fault condition when an error condition, ie an insufficient magnetic holding force, is detected.
  • Fig. 5 shows a possible flowchart that can be used to perform more refined monitoring of the current.
  • the flowchart 38 it is first queried whether the current intensity of the electromagnet at a time t 1 is below a predetermined current intensity at this time (I 1 ⁇ I 1G ). If this is the case, a query is subsequently made as to whether the current intensity is less than a predefined limit value at a subsequent time t 2 (I 2 ⁇ I 2G ). If this is the case, then the holding force of the electromagnet is sufficient, which leads to the output of the signal "OK", so that the activation of the drilling unit can be released. If, in the second query, the current strength exceeds the preset limit value I 2G , an error is deduced from this, which leads to the output of an error signal, which is indicated by "F".
  • monitoring of the increase in current can also take place and depending on a specific increase in current at a predetermined time or the increase in current at certain successive times, a corresponding monitoring can be ensured to an activation of Release drilling unit.
  • an error signal is generated, this is preferably indicated optically and acoustically to the user by means of the signal display. Additionally or alternatively, activation of the drilling unit 20 may be blocked.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Earth Drilling (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Claims (15)

  1. Support de perçage magnétique comprenant une unité de perçage (20), notamment pour le perçage d'un avant-trou, comprenant un électroaimant (14) pour fixer le support de perçage magnétique (10) à un composant (129), comprenant une source de tension qui peut être connectée à l'électroaimant (14) et comprenant un dispositif de sécurité (28) pour surveiller la force de maintien de l'électroaimant (14), le dispositif de sécurité (28) présentant un dispositif pour surveiller l'intensité du courant de l'électroaimant (14) et en dériver un signal indiquant une force de maintien magnétique suffisante (OK) ou une situation de défaut (F), caractérisé en ce que le dispositif de sécurité (28) génère un signal (OK) indiquant une force de maintien magnétique suffisante quand, pendant une phase de test, l'intensité du courant de l'électroaimant (14) est inférieure à une valeur limite (I1 < I1G, in < I2G) prédéfinie correspondante à au moins deux instants prédéterminés (t1, t2) après le début de la phase de test.
  2. Support de perçage magnétique selon la revendication 1, caractérisé en ce que le dispositif de sécurité (28) comprend un indicateur (29) pour signaliser une situation de défaut pour un utilisateur.
  3. Support de perçage magnétique selon la revendication 1 ou 2, caractérisé en ce que le dispositif de sécurité (28) ne permet une activation de l'unité de perçage (20) que si aucune situation de défaut n'est détectée.
  4. Support de perçage magnétique selon l'une des revendications précédentes, caractérisé en ce que l'électroaimant (14) est au moins partiellement démagnétisé pendant une phase de démagnétisation qui précède le phase de test avant d'être alimenté avec une tension continue pendant la phase de test.
  5. Support de perçage magnétique selon la revendication 4, caractérisé en ce que l'électroaimant (14), pendant la phase de démagnétisation, est alimenté avec une tension continue à polarité changeante ou avec une tension alternative.
  6. Support de perçage magnétique selon l'une des revendications précédentes, caractérisé en ce que le dispositif de sécurité (28) génère un signal (OK) indiquant une force de maintien magnétique suffisante quand, après écoulement de 30 % d'une durée prédéfinie de la phase de test, le courant à travers l'électroaimant a atteint au maximum 85 % du courant nominal (IN) de l'électroaimant (14) et, après écoulement de 43 % de la durée de la phase de test, a atteint au maximum 95 % du courant nominal (IN) de l'électroaimant (14).
  7. Support de perçage magnétique selon l'une des revendications précédentes, caractérisé en ce que le dispositif de sécurité (28), lorsque l'intensité du courant est supérieure à une valeur limite prédéfinie à au moins l'un des instants prédéterminés à l'intérieur de la phase de test, génère un signal (OK) indiquant une force de maintien magnétique suffisante si l'intensité du courant de l'électroaimant (14) est à chaque fois inférieure à des valeurs limites prédéfinies (In < InG, In+1 < In+1G) à au moins deux instants ultérieurs à l'intérieur de la phase de test.
  8. Support de perçage magnétique selon la revendication 7, caractérisé en ce que le dispositif de sécurité (28) génère un signal indiquant une force de maintien magnétique suffisante si l'intensité du courant de l'électroaimant (14) est à chaque fois inférieure aux valeurs limites prédéfinies (In < InG, In+1) < In+1G) à au moins deux instants ultérieurs successifs à l'intérieur de la phase de test.
  9. Support de perçage magnétique selon l'une des revendications précédentes, caractérisé en ce que le dispositif de sécurité (28) génère un signal (F) pour une situation de défaut lorsque l'intensité du courant, après l'écoulement de la phase de test, chute pendant une phase de travail au-dessous d'une valeur limite prédéfinie (Imin).
  10. Support de perçage magnétique selon la revendication 9, caractérisé en ce que le dispositif de sécurité (28) génère un signal (F) pour une situation de défaut lorsque l'intensité du courant, après l'écoulement de la phase de test, chute pendant la phase de travail au-dessous d'une valeur limite prédéfinie (Imin) qui correspond à 50 % du courant nominal (IN) de l'électroaimant (14).
  11. Support de perçage magnétique selon l'une des revendications précédentes, caractérisé en ce que la phase de test a une durée de 700 à 800 millisecondes, de préférence de 720 à 750 millisecondes.
  12. Support de perçage magnétique selon l'une des revendications précédentes, caractérisé en ce que la phase de test est précédée par une phase de démagnétisation ayant une durée de 700 à 1000 millisecondes, de préférence de 800 à 900 millisecondes.
  13. Procédé de surveillance de la force de maintien d'un électroaimant (14) sur un support de perçage magnétique (10), selon lequel l'intensité du courant de l'électroaimant (14) est surveillée pour en dériver un signal indiquant une force de maintien magnétique suffisante (OK) ou une situation de défaut (F), caractérisé en ce qu'un signal (OK) indiquant une force de maintien magnétique suffisante n'est généré que quand, pendant une phase de test, l'intensité du courant de l'électroaimant (14) est inférieure à une valeur limite (I1 < I1G, I2 < I2G) prédéfinie correspondante à au moins deux instants prédéterminés (t1, t2) après le début de la phase de test, une activation de l'unité de perçage (20) étant de préférence bloquée lorsqu'un signal (F) pour une situation de défaut est généré.
  14. Procédé selon la revendication 13, selon lequel, lorsque l'intensité du courant à au moins l'un des instants prédéterminés pendant la phase de test est supérieure à une valeur limite prédéfinie, un signal indiquant une force de maintien magnétique suffisante est généré lorsque l'intensité du courant de l'électroaimant (14) est à chaque fois inférieure à des valeurs limites prédéfinies (In < InG, In+1 < In+1G) à au moins deux instants ultérieurs à l'intérieur de la phase de test.
  15. Procédé selon la revendication 13, selon lequel, lorsque l'intensité du courant à au moins l'un des instants prédéterminés pendant la phase de test est tout d'abord supérieure à une valeur limite prédéfinie, une force de maintien magnétique suffisante est détectée lorsque l'intensité du courant de l'électroaimant (14) est à chaque fois inférieure à des valeurs limites prédéfinies (In < InG, In+1 < In+1G) à au moins deux instants ultérieurs successifs à l'intérieur de la phase de test.
EP10157835A 2009-05-13 2010-03-25 Support électromagnétique avec surveillance de la résistance Not-in-force EP2251154B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009022333A DE102009022333A1 (de) 2009-05-13 2009-05-13 Magnetbohrständer mit Überwachung der Haltekraft

Publications (2)

Publication Number Publication Date
EP2251154A1 EP2251154A1 (fr) 2010-11-17
EP2251154B1 true EP2251154B1 (fr) 2012-03-21

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EP10157835A Not-in-force EP2251154B1 (fr) 2009-05-13 2010-03-25 Support électromagnétique avec surveillance de la résistance

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US (1) US8545139B2 (fr)
EP (1) EP2251154B1 (fr)
AT (1) ATE550153T1 (fr)
DE (1) DE102009022333A1 (fr)

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Publication number Publication date
US8545139B2 (en) 2013-10-01
ATE550153T1 (de) 2012-04-15
DE102009022333A1 (de) 2010-11-18
EP2251154A1 (fr) 2010-11-17
US20100290847A1 (en) 2010-11-18

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