EP1375077A2 - Pneumatic percussion mechanism - Google Patents
Pneumatic percussion mechanism Download PDFInfo
- Publication number
- EP1375077A2 EP1375077A2 EP03405286A EP03405286A EP1375077A2 EP 1375077 A2 EP1375077 A2 EP 1375077A2 EP 03405286 A EP03405286 A EP 03405286A EP 03405286 A EP03405286 A EP 03405286A EP 1375077 A2 EP1375077 A2 EP 1375077A2
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- EP
- European Patent Office
- Prior art keywords
- sensor
- pneumatic
- piston
- mechanism according
- flying
- 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.)
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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, in particular for an at least partially hitting machine tool, such as a drill Chisel.
- 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.
- 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.
- An impact temperature from the sensor signal is advantageous via the arithmetic 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.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Actuator (AREA)
Abstract
Description
Die Erfindung bezeichnet ein pneumatisches Schlagwerk mit einem Flugkolben, insbesondere für eine zumindest teilweise schlagende Werkzeugmaschine, wie einen Bohroder Meisselhammer.The invention refers to a pneumatic striking mechanism with a flying piston, in particular for an at least partially hitting machine tool, such as a drill Chisel.
Bei einer üblichen zumindest teilweise schlagenden Werkzeugmaschine mit einem pneumatischen Schlagwerk, ist in einem teilweise drehbaren Führungsrohr über eine Gasfeder ein, auf einen Döpper und weiter auf das Stirnende eines Werkzeugs, schlagender Flugkolben hin- und her bewegbar. Durch die Erregung der Gasfeder über einen Erregerkolben einerseits und die Wechselwirkung des Werkzeugs mit dem zu bearbeitenden Material andererseits, unterliegt der Flugkolben einer komplexen Schwingungskinematik, deren eingeschwungener Schwingungszustand charakteristisch von den Randbedindungen abhängt. Üblicherweise wird die Schwingungskinematik des Flugkolbens gemeinsam mit den weiteren bewegten Teilen durch Simulationsrechnungen und praktische Versuche optimiert und konstruktiv realisiert.In 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. By the excitement of the gas spring over one Exciter piston on the one hand and the interaction of the tool with the machined Material, on the other hand, the flying mass is subject to complex oscillation kinematics, their steady state of vibration is characteristic of the boundary conditions depends. Usually, the oscillation kinematics of the flying piston together with the other moving parts optimized by simulation calculations and practical experiments and realized constructively.
Nach der US3464503 erfasst ein piezoelektrischer Sensor die Schläge des Schlagwerks auf das Werkzeug und gestattet in Kombination mit einer Auswerteelektronik eine geregelte Adaption des Schlagwerkverhaltens an das zu bearbeitende Material. Eine derartige Schlagimpulsmessung ermöglicht keine umfassende Aussage über den Schwingungszustand des Flugkolbens.According to US3464503 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.
Zudem wird nach der DE19956313 bei einem Arbeitszylinder die Position eines fluidgeführten Kolbens mit einem Permanentmagneten mit einem ausserhalb des Führungsrohrs angeordneten Sensor magnetisch erfasst. Eine derartige Anordnung eines Permanentmagneten eignet sich bevorzugt für langsame Kolben, welche nicht schlagend beansprucht werden.In addition, according to DE19956313 in a working cylinder, the position of a fluid-guided piston with a permanent magnet with one outside the Guide tube arranged magnetically detected. Such an arrangement of Permanent magnets are preferably suitable for slow pistons, which are not hitting be claimed.
Zudem wird nach der DE3210716 mit einem radial aussen, berührungslos zugeordneten magnetoresistiven Sensors eine hohe Geschwindigkeit eines, mit mehreren axial beabstandeten Ringbereichen unterschiedlicher Permeabilität versehenen, Kolbens magnetisch erfasst, indem die Änderung des magnetischen Flusses radial aussen durch den Kolben erfasst wird.In addition, according to DE3210716 with a radially outside, contactless assigned magnetoresistive sensor a high speed one, with multiple axial spaced annular regions of different permeability provided piston magnetically detected by the change of magnetic flux radially outward through the Piston is detected.
Es ist die Aufgabe der Erfindung bei einem pneumatischen Schlagwerk mit einem Flugkolben dessen Bewegung zumindest stückweise messtechnisch zu erfassen. Ein weiterer Aspekt besteht in der Realisierung einer Werkzeugmaschine mit einer auf einer Messung der Bewegung des Flugkolbens beruhenden Steuerung bzw. Regelung.It is the object of the invention in a pneumatic percussion with a Flying Piston to detect its movement at least piecemeal metrologically. One Another aspect is the realization of a machine tool with one on one Measurement of the movement of the air piston-based control.
Die Aufgabe wird im wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is essentially achieved by the features of the independent claims. Advantageous developments emerge from the subclaims.
Erfindungsgemäss weist ein pneumatisches Schlagwerk mit einem axial hin- und herbewegten, schlagend beanspruchten Flugkolben einen radial zu diesem berührungslos angeordneten magnetfeldempfindlichen Sensor auf, wobei der Flugkolben zumindest radial aussen ferromagnetisches Material aufweist und mehrere axial beabstandete Bereiche unterschiedlicher magnetischer Permeabilität aufweist.According to the invention, a pneumatic striking mechanism with an axially back and herbewegten, hitting claimed flying pistons a radial to this contactless arranged magnetic field-sensitive sensor, wherein the flying piston at least radially outside ferromagnetic material and a plurality of axially spaced portions having different magnetic permeability.
Durch den berührungslos angeordneten magnetfeldempfindlichen Sensor, welcher optional in sich einen Permanentmagneten zur Erzeugung des magnetischen Flusses aufweist, ist die Bewegung eines axial hin- und herbewegten, schlagend beanspruchten Flugkolbens messbar. Die Bereiche unterschiedlicher magnetischer Permeabilität im Flugkolben erzeugen am Ausgang des magnetfeldempfindlichen Sensors nahezu ein sinusförmiges Signal, dessen Amplitude abhängig vom Abstand des Sensors zum Flugkolben ist.Due to 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.
Vorteilhaft ist der magnetfeldempfindliche Sensor als, weiter vorteilhaft differentiell geschalteter, solid-state Magnetfeldsensor wie (Hall -Sensor, AMR (anisotropic magneto resistance) -Sensor, GMR (giant magneto resistance) - Sensor, MR (magnetor resistance) - Sensor, Ml (magneto impedance) -Sensor oder als induktiver Sensor inklusive Spule und Flussführung ausgeführt, welche jeweils als Standardbauteile verfügbar sind. Differentielle Sensoren sind unempfindlicher auf das radiale Spiel des Flugkolbens. Sie messen nur den Fluss-Unterschied zwischen zwei benachbarten Positionen.Advantageously, 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.
Die Geometrie dieser Bereiche ist vom Luftspalt und vom Abstand der differentiell geschalteten magnetfeldempfindlichen Sensoren abhängig, wobei vorteilhaft die axiale Strukturgrösse der Bereiche mindestens dem Luftspalt (Abstand Sensorvorderkante zum Flugkolben) entspricht. Etwas grössere Strukturbreiten sind vorteilhaft, um die Signalamplituden zu vergrössern. Für die Messung des Geschwindigkeitsverlaufes des Flugkolbens sind möglichst viele axial beabstandete Bereiche auf dem Kolben von Vorteil. 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.
Wertet man z.B. nur die Nulldurchgänge aus, so erhält man pro Periode der Bereiche zwei Geschwindigkeitsinformationen. Ist bei differentiell geschalteten Sensoren der axiale Abstand T dieser beiden Sensoren gegeben (z.B. Tsens=0.8 oder 2.0 mm), so sollte sich die Periode der Bereiche an diesem Abstand orientieren. Die optimale Periode der Bereiche wäre dann das Doppelte des Abstandes der Sensoren (TBereich=1.6mm bzw. 4 mm). Weiter vorteilhaft ist zudem, die Sensoren phasenversetzt im Abstand (2n+1)/2*TBereich zu plazieren (n = 0,1,2,...).If, for example, one evaluates only the zero crossings, one obtains two speed information per period of the ranges. If, in the case of differentially connected sensors, the axial distance T of these two sensors is given (eg T sens = 0.8 or 2.0 mm), the period of the regions should be oriented at this distance. The optimum period of the ranges would then be twice the distance of the sensors (T range = 1.6 mm or 4 mm). It is also advantageous to place the sensors out of phase at a distance (2n + 1) / 2 * T range (n = 0,1,2, ...).
Vorteilhaft sind die Bereiche unterschiedlicher magnetischer Permeabilität durch mehrere axial beabstandete, luftgefüllte Radialrillen ausgebildet, welche technologisch einfach herstellbar sind.Advantageously, the regions of different magnetic permeability are more than one formed axially spaced, air-filled radial grooves, which are technologically simple can be produced.
Vorteilhaft sind die Radialrillen 0,1 - 1,5 mm, optimal 0,8 mm tief und 0,5 - 5,0 mm, optimal 3,2 mm breit und bilden einen verbleibenden von 0,1 - 3,0 mm, optimal 1,6 mm breiten axialen Zwischensteg aus, wodurch grosse Permeabilitätsunterschiede bei der Vorbeibewegung am Sensor auftreten.Advantageously, the radial grooves 0.1 - 1.5 mm, optimally 0.8 mm deep and 0.5 - 5.0 mm, optimal 3.2 mm wide and form a remaining of 0.1 - 3.0 mm, optimally 1.6 mm wide axial gutter, whereby large permeability differences in the Moving past the sensor occur.
Vorteilhaft ist der Sensor radial ausserhalb eines optional drehbaren Führungsrohres für den Flugkolben berührungslos angeordnet, wodurch eine Messung durch das Führungsrohr hindurch möglich ist.Advantageously, the sensor 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.
Vorteilhaft ist das Führungsrohr im axialen Messstellenbereich aussen radial auf 0,1 - 2,0 mm, optimal 0,2 mm verjüngt, wodurch bei einem hinreichend beulsteifen / biegesteifen Führungsrohr der Abstand des Sensors zum Flugkolben verringerbar ist.Advantageously, the guide tube in the axial measuring point area outside radially to 0.1 - 2.0 mm, optimally 0.2 mm tapered, resulting in a sufficiently bulge / bending Guide tube, the distance between the sensor and the flying piston can be reduced.
Vorteilhaft besteht das Führungsrohr aus nichtferromagnetischem Material, wodurch das Führungsrohr einen geringeren Einfluss auf das den Flugkolben radial aussen durchsetzende Messmagnetfeld ausübt.Advantageously, 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.
Vorteilhaft ist der Sensor mit einer Recheneinheit verbunden, welche aus dem zeitlichen Verlauf des Sensorsignals, welches den vom Sensor erfassten Permeabilitätsschwankungen bei der Vorbeibewegung der Bereiche unterschiedlicher Permeabilität entspricht, eine Position und/oder Geschwindigkeit des Flugkolbens ermittelt, wodurch ein Rückschluss auf den eingeschwungenen Schwingungszustand des Flugkolbens möglich ist. Die Recheneinheit verwendet dazu übliche Methoden der Signalverarbeitung wie:
- Nulldurchgänge, Maxima und Minima
- Curve-Fitting (Stückweise cos-Fit, nonlinear leastqueres fit)
- Demodulation
- Fourier-Transformation, Power-Spektrum
- Filterung (Autoregressive Filter zur Spektralschätzung)
- Frequenzschätzmethoden (time-frequency analysis)
- Zero crossings, maxima and minima
- Curve fitting (piecewise cos-fit, nonlinear least transverse fit)
- demodulation
- Fourier transformation, power spectrum
- Filtering (autoregressive filters for spectral estimation)
- Frequency estimation methods (time-frequency analysis)
Vorteilhaft weist die Recheneinheit bezüglich der Kinematik des Flugkolbens selektiv aktivierbare Klassifikationsmittel, wie Frequenzfilter auf, wodurch unterschiedliche Schlagzustände detektierbar und zuordenbar sind, bspw. beim Auftreffen eines Werkzeugs auf einen in Beton eingebetteten Baustahl.Advantageously, 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.
Vorteilhaft weist eine zumindest teilweise schlagende Werkzeugmaschine mit einem pneumatischen Schlagwerk mit einem axial hin- und herbewegten, schlagend beanspruchten Flugkolben eine derartige Messanordnung auf, wodurch bei einer Werkzeugmaschine die Kinematik des Flugkolbens zumindest stückweise direkt messbar ist.Advantageously, an at least partially hitting machine tool with a pneumatic percussion with an axially reciprocating, beating stressed Flying piston on such a measuring arrangement, whereby in a machine tool the Kinematics of the flying piston is at least piecewise directly measurable.
Vorteilhaft steuert die Recheneinheit in Abhängigkeit der, den unterschiedlichen Schlagzuständen des Flugkolbens, aktivierten Klassifikationsmittel entsprechende Steuermittel an, bspw. zur Reduzierung der Motordrehzahl und/oder der Drehzahl des Werkzeuges und/oder der Unterbrechung oder der Regelung des Schlagantriebs und damit der Schlagleistung.Advantageously, 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.
Vorteilhaft ist die Recheneinheit mit einem Sollwertspeicher für ein die optimale Kinematik des Flugkolbens sowie optional weiteren Randbedingungen wie Schlagenergie, Stosszahl, Drehzahl usw. für unterschiedliche zu bearbeitende Materialien verbunden, welcher weiter vorteilhaft als mehrdimensionales Array organisiert ist, wodurch die Werkzeugmaschine selbsttätig adaptiv auf eine optimale Kinematik des Flugkolbens und somit auf optimale Abbauleistung einregelbar ist.Advantageously, 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 Abbauleistung einregelbar is.
Vorteilhaft ist über die Recheneinheit eine Leerschlagposition des Flugkolbens aus dem Sensorsignal ermittelbar sowie über entsprechende Steuermittel, wie dem Elektromotor das Schlagwerk deaktivierbar, wodurch zusätzliche Fangmittel für den Flugkolben, welche Platz benötigen und dadurch die Werkzeugmaschine verlängern, entfallen können. Advantageously, via the computing unit a Leerschlagposition of the flying piston from the Sensor signal determined and via appropriate control means, such as the electric motor Schlagwerk deactivatable, which provides additional catch for the flying piston, which place require and thereby extend the machine tool, can be omitted.
Vorteilhaft ist über die Recheneinheit eine Schlagwerkstemperatur aus dem Sensorsignal ermittelbar sowie über entsprechende Steuermittel wie dem Elektromotor das Schlagwerk deaktivierbar, wodurch die Lebensdauer erhöhbar ist.An impact temperature from the sensor signal is advantageous via the arithmetic unit ascertainable and via appropriate control means such as the electric motor the percussion deactivatable, whereby the life is increased.
Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:
Nach Fig. 1 weist ein pneumatisches Schlagwerk mit einem axial hin- und herbewegten, auf
einen Döpper 1 schlagenden Flugkolben 2 einen radial zu diesem berührungslos
angeordneten magnetfeldempfindlichen Sensor 3 auf, wobei der Flugkolben 2 vollständig
aus ferromagnetischem Material in Form von Stahl besteht und vier axial beabstandete
Bereiche 4 unterschiedlicher magnetischer Permeabilität in Form von vier luftgefüllten
Radialrillen aufweist. Der Sensor 3 ist als ein intern differentiell geschalteter, solid-state
Magnetfeldsensor ausgebildet und erzeugt ein Messmagnetfeld H, dessen Magnetfluss in
den radialen Randbereich des Flugkolbens 2 eindringt. Die Radialrillen des Flugkolbens 2
sind 0,8 mm tief und 3,2 mm breit und bilden einen verbleibenden 1,6 mm breiten axialen
Zwischensteg 7 aus. Der Sensor 3 ist radial ausserhalb eines drehbaren Führungsrohres 5
aus nichtferromagnetischem Chromstahl in einem aussen radial auf 0,2 mm verjüngten,
axialen Messstellenbereich X berührungslos fest angeordnet. Der Sensor 3 ist mit einer
Recheneinheit 6 in Form eines Mikrocontrollers verbunden, welche weiter mit der nicht
dargestellten Motorelektronik des ebenfalls nicht dargestellten Elektromotors verbunden ist.According to Fig. 1, a pneumatic impact mechanism with an axially reciprocating, on
an
Nach Fig. 2 ist das Sensorsignal beim Aufschlagen des Flugkolbens während des
eingeschwungenen Betriebszustandes dargestellt. Ein wesentliches Merkmal dieses
Sensorsignals ist der grosse Signalhub am Anfang, dadurch verursacht, dass der Flugkolben
selbst in den Bereich des Sensors gelangt. Dieser Signalhub ist immer grösser als die
übrigen Oszillationen, da die Flussänderung durch die Masse des Flugkolbens selbst grösser
ist als jene, die durch die Rillen generiert wird. Dieser charakteristische Signalhub wird als
Triggersignal T für die Datenerfassung benutzt. Im Sensorsignal sind von links nach rechts
die Signalabschnitte A - E erkennbar, welche von der Recheneinheit selektiert und
entsprechend ausgewertet werden.
Damit ergeben sich bspw. für einen Bohrhammer vorteilhafte Anwendungsmöglichkeiten zur:
Claims (15)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10219950 | 2002-05-03 | ||
DE10219950A DE10219950C1 (en) | 2002-05-03 | 2002-05-03 | Pneumatic hammer mechanism with magnetic field sensitive sensor |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1375077A2 true EP1375077A2 (en) | 2004-01-02 |
EP1375077A3 EP1375077A3 (en) | 2004-02-04 |
EP1375077B1 EP1375077B1 (en) | 2005-11-16 |
Family
ID=28685335
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03405286A Expired - Lifetime EP1375077B1 (en) | 2002-05-03 | 2003-04-23 | Pneumatic percussion mechanism |
Country Status (4)
Country | Link |
---|---|
US (1) | US6799644B2 (en) |
EP (1) | EP1375077B1 (en) |
JP (1) | JP2003326475A (en) |
DE (2) | DE10219950C1 (en) |
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EP1607186A1 (en) * | 2004-06-18 | 2005-12-21 | HILTI Aktiengesellschaft | Electro-pneumatic hammer drill / chisel hammer with modifiable impact energy |
WO2013174594A1 (en) * | 2012-05-25 | 2013-11-28 | Robert Bosch Gmbh | Percussion unit |
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DE102007000488A1 (en) * | 2007-09-12 | 2009-03-19 | Hilti Aktiengesellschaft | Hand tool with air spring impact mechanism, linear motor and control method |
DE102007060909B8 (en) * | 2007-12-14 | 2013-05-02 | DYNATEC GmbH | Fluid operated machining tool |
DE102007060911A1 (en) * | 2007-12-14 | 2009-06-18 | DYNATEC Gesellschaft für CAE und Dynamik mbH | Cutting tool for use in welding device, has housing in which tool unit is axially supported by drive, and sensors i.e. light barriers, arranged in housing for determining speed of drive in direction of tool unit |
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- 2003-04-23 EP EP03405286A patent/EP1375077B1/en not_active Expired - Lifetime
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EP1607186A1 (en) * | 2004-06-18 | 2005-12-21 | HILTI Aktiengesellschaft | Electro-pneumatic hammer drill / chisel hammer with modifiable impact energy |
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Also Published As
Publication number | Publication date |
---|---|
JP2003326475A (en) | 2003-11-18 |
EP1375077A3 (en) | 2004-02-04 |
US6799644B2 (en) | 2004-10-05 |
DE50301651D1 (en) | 2005-12-22 |
DE10219950C1 (en) | 2003-10-30 |
US20030205393A1 (en) | 2003-11-06 |
EP1375077B1 (en) | 2005-11-16 |
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