EP1375077B1 - Mécanisme de percussion à ressort pneumatique - Google Patents

Mécanisme de percussion à ressort pneumatique Download PDF

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Publication number
EP1375077B1
EP1375077B1 EP03405286A EP03405286A EP1375077B1 EP 1375077 B1 EP1375077 B1 EP 1375077B1 EP 03405286 A EP03405286 A EP 03405286A EP 03405286 A EP03405286 A EP 03405286A EP 1375077 B1 EP1375077 B1 EP 1375077B1
Authority
EP
European Patent Office
Prior art keywords
percussion mechanism
sensor
flying piston
pneumatic percussion
piston
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.)
Expired - Lifetime
Application number
EP03405286A
Other languages
German (de)
English (en)
Other versions
EP1375077A3 (fr
EP1375077A2 (fr
Inventor
Hanspeter Schad
Hans Böni
Alexander Hoop
Albert Binder
Cristoph Würsch
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP1375077A2 publication Critical patent/EP1375077A2/fr
Publication of EP1375077A3 publication Critical patent/EP1375077A3/fr
Application granted granted Critical
Publication of EP1375077B1 publication Critical patent/EP1375077B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—Guide-sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0023—Pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/141—Magnetic parts used in percussive tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/221—Sensors

Definitions

  • the invention refers to a pneumatic striking mechanism with a flying piston, especially for an at least partially hitting machine tool, such as a or chisel hammer.
  • a conventional at least partially hitting machine tool with a pneumatic impact mechanism is in a partially rotatable guide tube over a Gas spring on, on an anvil and on the front end of a tool, beating Air piston reciprocable.
  • the flying mass is subject to complex oscillation kinematics, their steady state of vibration is characteristic of the boundary conditions depends.
  • the oscillation kinematics of the flying piston together with the other moving parts optimized by simulation calculations and practical experiments and realized constructively.
  • a piezoelectric sensor detects the impacts of the percussion mechanism the tool and in combination with a transmitter allows a regulated Adaptation of impact mechanism behavior to the material to be processed. Such Impact pulse measurement does not allow a comprehensive statement about the Vibration state of the flying piston.
  • US5806609 is a pneumatic percussion with an axially back and herbewegten, beating claimed piston known to the monitoring of the Impact pulses a sensor is assigned without contact.
  • the non-contact magnetic field-sensitive sensor which optionally has a permanent magnet for generating the magnetic flux, is the Movement of an axially reciprocating, impacted fly piston measurable.
  • the regions of different magnetic permeability in the flying mass produce at the output of the magnetic field sensitive sensor almost a sinusoidal Signal whose amplitude depends on the distance of the sensor to the flying mass.
  • the magnetic-field-sensitive sensor as, further advantageous differentially switched, solid-state magnetic field sensor such as (Hall sensor, AMR (anisotropic magneto resistance) sensor, GMR (giant magneto resistance) sensor, MR (magnetor resistance) Sensor, Ml (magneto-impedance) sensor or as inductive sensor including coil and Flow guidance executed, which are available as standard components.
  • differential Sensors are less sensitive to the radial play of the flying piston. They only measure the Flow difference between two adjacent positions.
  • the geometry of these areas is different from the air gap and the distance switched magnetic field-sensitive sensors dependent, wherein advantageously the axial Structure size of the areas at least the air gap (distance sensor leading edge to Flying piston) corresponds. Slightly larger structure widths are advantageous to the To increase signal amplitudes.
  • For the measurement of the velocity course of the Air piston are as many axially spaced areas on the piston advantageous.
  • the regions of different magnetic permeability are more than one formed axially spaced, air-filled radial grooves, which are technologically simple can be produced.
  • the senor is radially outside of an optionally rotatable guide tube for the Air piston arranged non-contact, causing a measurement through the guide tube through is possible.
  • the guide tube made of non-ferromagnetic material, whereby the Guide tube has a smaller influence on the flying piston radially outside enforcing measuring magnetic field exerts.
  • the arithmetic unit selectively with respect to the kinematics of the flying piston activatable classification means, such as frequency filters, resulting in different Beat states are detectable and can be assigned, for example when hitting a tool on a structural steel embedded in concrete.
  • the arithmetic unit controls the different, depending on Beat states of the flying piston, activated classification means corresponding Control means, for example, to reduce the engine speed and / or the speed of the Tool and / or the interruption or the regulation of the percussion drive and thus the impact performance.
  • the arithmetic unit with a setpoint memory for an optimal kinematics of the flying mass and optionally further boundary conditions such as impact energy, impact number, Speed etc. connected for different materials to be machined which continues is advantageously organized as a multi-dimensional array, whereby the machine tool automatically adaptive to optimal kinematics of the flying piston and thus to optimum Abbau amalgam einregelbar is.
  • a Leertschposition of the flying piston from the Sensor signal determined and via appropriate control means, such as the electric motor Schlagtechnik deactivatable, which provides additional catch for the flying piston, which place require and thereby extend the machine tool, can be omitted.
  • Distributed is a percussion temperature from the sensor signal via the computing unit ascertainable and via appropriate control means such as the electric motor the percussion deactivatable, whereby the life is increased.
  • the sensor 3 is considered to be an internally differentially switched, solid-state Magnetic field sensor is formed and generates a measuring magnetic field H whose magnetic flux in penetrates the radial edge region of the flying piston 2.
  • the radial grooves of the flying piston 2 are 0.8 mm deep and 3.2 mm wide and form a remaining 1.6 mm wide axial Gutter 7 off.
  • the sensor 3 is radially outside a rotatable guide tube. 5 made of non-ferromagnetic chromium steel tapered radially to 0.2 mm in one outer, axial measuring point area X contact-free fixed.
  • the sensor 3 is with a Computing unit 6 connected in the form of a microcontroller, which further with the not shown engine electronics of the electric motor, also not shown is connected.
  • the flying mass gets different speeds when hitting the striker or the front end of the tool reflected.
  • the Air piston Based on the backward movement of the Air piston can from the detected sensor signal with methods of signal processing (For example, about the calculation and assignment of background-specific impact energy and burst number), using pattern recognition and fuzzy logic or neural networks
  • the type of worked ground can be determined.
  • the ratio of the velocity of the flying piston before striking the striker Return flight speed is the number of hits. This is the measure for the mining performance.
  • a defined background e.g. Concrete, can over these parameters the Quality or condition of the hammer / tool to be checked.
  • the arithmetic unit Based on the speed of the flying piston before hitting the impact energy and the impact power in the usual way be calculated by the arithmetic unit. These is needed as a measure for a performance-dependent control of the hammer drill. About these Control, for example. About the speed of the electric motor, the impact energy of the Calculating unit are steplessly controlled.
  • the z. B. automatically detected when drilling on a tile, that this is a fragile ceramic and thus in a 'soft mode' switches, in which the impact energy is limited, for example, to 1.0 Joule. As soon as the tile is pierced and the ground changes, this is done by the arithmetic unit detected, and increases the impact energy of the hammer drill to the maximum impact performance. By this regulation is without additional measures of the user a bore with smooth edge allows.
  • From the sensor signal can be the position of the flying piston from the arithmetic unit determine. If the aircraft piston flies forward beyond the impact position can Preventing the lookup of the electric motor from the arithmetic unit immediately switched off or disconnected and in particular in the case of an SR (switched reluctance) - Motor to be actively braked.
  • SR switched reluctance
  • a magnetic-field-sensitive sensor on the impact mechanism enables temperature measurement.
  • the impact temperature is an indicator of the lubrication and the current Wear condition of the impact mechanism.
  • the magnetic permeability of most ferromagnetic materials decreases with increasing temperature.
  • ⁇ 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Actuator (AREA)

Claims (15)

  1. Mécanisme de percussion pneumatique avec un piston volant à mouvement de va-et-vient axial, sollicité en percussion (2), caractérisé en ce qu'un capteur (3) sensible aux champs magnétiques, monté sans contact, lui est associé radialement, en ce que le piston volant (2) comporte, au moins radialement à l'extérieur, du matériau ferromagnétique, et en ce que le piston volant (2) comporte plusieurs zones distantes axialement (4) à perméabilité magnétique différente.
  2. Mécanisme de percussion pneumatique selon la revendication 1, caractérisé en ce que le capteur (3) est conçu sous la forme d'un capteur de champ magnétique solide ou d'un capteur inductif et, optionnellement, comporte intérieurement un montage différentiel.
  3. Mécanisme de percussion pneumatique selon la revendication 1 ou 2, caractérisé en ce qu'une dimension structurelle axiale des zones (4) correspond au moins à l'entrefer effectif dans le champ magnétique de mesure (H).
  4. Mécanisme de percussion pneumatique selon une des revendications 1 à 3, caractérisé en ce que les zones (4) de perméabilité magnétique différente sont créées par plusieurs rainures radiales distantes axialement, remplies d'air.
  5. Mécanisme de percussion pneumatique selon la revendication 4, caractérisé en ce que les rainures radiales ont une profondeur de 0,1 à 1,5 mm et une largeur de 0,5 à 5,0 mm et déterminent une nervure intermédiaire axiale restante (7) de 0,1 à 3,0 mm de largeur.
  6. Mécanisme de percussion pneumatique selon une des revendications précédentes, caractérisé en ce que le capteur (3) est disposé sans contact radialement à l'extérieur d'un tube de guidage optionnellement tournant (5) pour le piston volant (2).
  7. Mécanisme de percussion pneumatique selon la revendication 6, caractérisé en ce que, dans la zone axiale des points de mesure, le tube de guidage (5) est rétréci extérieurement à 0,1 à 0,2 mm dans le sens radial.
  8. Mécanisme de percussion pneumatique selon la revendication 6 ou 7, caractérisé en ce que, au moins dans la zone axiale des points de mesure (X), le tube de guidage (5) est constitué de matériau non ferromagnétique.
  9. Mécanisme de percussion pneumatique selon une des revendications précédentes, caractérisé en ce que le capteur (3) est connecté à un module de calcul (6) pour déterminer une position et/ou une vitesse du piston volant (2) à partir de la variation temporelle du signal du capteur.
  10. Mécanisme de percussion pneumatique selon la revendication 9, caractérisé en ce que le module de calcul (6) comporte des moyens de classification activables sélectivement appliqués à la cinématique du piston volant (2).
  11. Machine-outil avec un mécanisme de percussion pneumatique avec un piston volant à mouvement de va-et-vient axial, sollicité en percussion (2), caractérisée en ce que le mécanisme de percussion pneumatique selon une des revendications précédentes est conçu pour mesurer le déplacement du piston volant (2).
  12. Machine-outil selon la revendication 11, caractérisée en ce que le module de calcul (6) est connecté à des moyens de commande qui sont commandés en fonction des moyens de classification activés.
  13. Machine-outil selon la revendication 11 ou 12, caractérisée en ce que le module de calcul (6) est connecté à une mémoire de valeurs de consigne, la mémoire de valeurs de consigne contenant des données relatives à la cinématique optimale du piston volant (2) ainsi que des conditions marginales supplémentaires optionnelles pour divers matériaux à travailler.
  14. Machine-outil selon une des revendications 11 à 13, caractérisée en ce que le module de calcul (6) permet de déterminer une position de percussion à vide du piston volant (2) à partir du signal du capteur ainsi que de désactiver le mécanisme de percussion par l'intermédiaire de moyens de commande appropriés.
  15. Machine-outil selon une des revendications 11 à 13, caractérisée en ce que le module de calcul (6) permet de déterminer une température du mécanisme de percussion à partir du signal de détection ainsi que de désactiver le mécanisme de percussion par l'intermédiaire de moyens de commande appropriés.
EP03405286A 2002-05-03 2003-04-23 Mécanisme de percussion à ressort pneumatique Expired - Lifetime EP1375077B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10219950 2002-05-03
DE10219950A DE10219950C1 (de) 2002-05-03 2002-05-03 Pneumatisches Schlagwerk mit magnetfeldempfindlichen Sensor

Publications (3)

Publication Number Publication Date
EP1375077A2 EP1375077A2 (fr) 2004-01-02
EP1375077A3 EP1375077A3 (fr) 2004-02-04
EP1375077B1 true EP1375077B1 (fr) 2005-11-16

Family

ID=28685335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03405286A Expired - Lifetime EP1375077B1 (fr) 2002-05-03 2003-04-23 Mécanisme de percussion à ressort pneumatique

Country Status (4)

Country Link
US (1) US6799644B2 (fr)
EP (1) EP1375077B1 (fr)
JP (1) JP2003326475A (fr)
DE (2) DE10219950C1 (fr)

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EP1607186A1 (fr) * 2004-06-18 2005-12-21 HILTI Aktiengesellschaft Perceuse à percussion / marteau piqueur électro-pneumatique à énergie d'impact modifiable
US7273998B2 (en) * 2004-09-15 2007-09-25 General Electric Company System and method for monitoring laser shock processing
EP1674205B1 (fr) * 2004-12-23 2014-03-19 Black & Decker Inc. Mécanisme d'entraînement pour outil motorisé
DE102005019095A1 (de) * 2005-04-25 2006-10-26 Ott Messtechnik Gmbh & Co. Kg Längenmessgerät
DE102007000488A1 (de) * 2007-09-12 2009-03-19 Hilti Aktiengesellschaft Handwerkzeugmaschine mit Luftfederschlagswerk, Linearmotor und Steuerverfahren
DE102007060911A1 (de) * 2007-12-14 2009-06-18 DYNATEC Gesellschaft für CAE und Dynamik mbH Bearbeitungswerkzeug
DE102007060909B8 (de) * 2007-12-14 2013-05-02 DYNATEC GmbH Fluidbetriebenes Bearbeitungswerkzeug
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EP2282871B1 (fr) * 2008-06-05 2016-03-23 Atlas Copco Rock Drills AB Dispositif et procédé permettant la détection d un paramètre associé à une position d un élément mobile dans un perforateur mécanique
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Also Published As

Publication number Publication date
EP1375077A3 (fr) 2004-02-04
DE50301651D1 (de) 2005-12-22
EP1375077A2 (fr) 2004-01-02
US20030205393A1 (en) 2003-11-06
DE10219950C1 (de) 2003-10-30
US6799644B2 (en) 2004-10-05
JP2003326475A (ja) 2003-11-18

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