EP4377049A1 - Procédé de commande en boucle ouverte et en boucle fermée d'une machine-outil - Google Patents

Procédé de commande en boucle ouverte et en boucle fermée d'une machine-outil

Info

Publication number
EP4377049A1
EP4377049A1 EP22761053.2A EP22761053A EP4377049A1 EP 4377049 A1 EP4377049 A1 EP 4377049A1 EP 22761053 A EP22761053 A EP 22761053A EP 4377049 A1 EP4377049 A1 EP 4377049A1
Authority
EP
European Patent Office
Prior art keywords
drive
speed
distance
lever element
machine tool
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.)
Pending
Application number
EP22761053.2A
Other languages
German (de)
English (en)
Inventor
Stefan Ringler
Ehsan MAHDIZADEH
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 EP4377049A1 publication Critical patent/EP4377049A1/fr
Pending legal-status Critical Current

Links

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
    • B25D17/04—Handles; Handle mountings
    • B25D17/043—Handles resiliently mounted relative to the hammer housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/965—Switches controlled by moving an element forming part of the switch
    • H03K17/97—Switches controlled by moving an element forming part of the switch using a magnetic movable element
    • 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
    • B25D2250/195—Regulation means
    • B25D2250/201—Regulation means for speed, e.g. drilling or percussion speed
    • 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
    • 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
    • B25D2250/255—Switches
    • B25D2250/265—Trigger mechanism in handle
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/9517—Proximity switches using a magnetic detector using galvanomagnetic devices

Definitions

  • the present invention relates to a method for controlling and regulating a machine tool, in particular a chipping hammer, containing a drive, a control device, a sensor device, a transmission device and a handle device, the handle device containing a lever element with a signal transmitter which can be pivoted relative to the sensor device .
  • a prior art chisel hammer is used for working (i.e. ripping, breaking or chiselling) mineral materials such as concrete, brick or the like.
  • the chipping hammer can also be referred to as a demolition, dismantling, break-up hammer, breaker or floor breaker.
  • the chisel hammer has a drive that transmits blows to a chisel tool (also called a chisel) with the help of a transmission mechanism.
  • the drive can be an electric motor, hydraulic drive, pneumatic drive or internal combustion engine.
  • the chipping hammer has two handles positioned on opposite sides of the housing of the chipping hammer. At least one of the two handles includes an activation switch with which the chipping hammer can be activated or switched on.
  • the handles usually extend at an obtuse angle to a longitudinal axis of the housing of the chipping hammer.
  • the activation switch is pressed and the chisel hammer is activated so that impacts are transmitted from the drive to the chisel.
  • a problem with a prior art chipping hammer is that a relatively inexperienced user can often have difficulty handling the chipping hammer.
  • the power development and in particular the impact impulses can make it difficult to work safely and efficiently with the chipping hammer.
  • the object is achieved by a method for controlling and regulating a machine tool, in particular a chisel hammer, containing a drive, a control device, a sensor device, a transmission device and a handle device, the handle device containing a lever element with a signal transmitter which is positioned relative to the sensor device is pivotable.
  • the process contains the process steps:
  • the transmission device generates a first impact frequency and a first power delivery when a first speed for the drive is set. If a second speed is set for the drive, the transmission device generates a second impact frequency and a second power delivery. The higher the set speed for the drive, the higher the impact frequency generated and the power development of the transmission device.
  • the first speed for the drive may correspond to a predetermined proportion, in particular between 60 and 80%, for example 75%, of the maximum speed for the drive.
  • the threshold value for the determined difference between the maximum distance and the first determined distance of the lever element may correspond to a predetermined proportion, in particular between 25 and 75%, for example 50% of the maximum distance.
  • the predetermined period of time may correspond to a value between 0.75 and 2 seconds and in particular 1 second.
  • FIG. 1 shows a schematic front view of a machine tool in the form of a chipping hammer
  • FIG. 2a shows a detailed view of a handle device in a first position
  • FIG. 2b shows a detailed view of the handle device in a second position
  • FIG. 2c shows a detailed view of the handle device in a third position.
  • FIG. 1 shows a machine tool 1 according to the invention in the form of a chipping hammer.
  • the machine tool 1 can also be designed in the form of a hammer drill, a drill, a saw, a grinder or the like.
  • the machine tool 1 designed as a chipping hammer essentially contains a housing 2, a drive 3, a control device 4, a first and second handle device 5, a transmission device 6, an energy supply device 7 and a tool holder 8.
  • the drive 3, the control device 4 and the transmission device 6 are essentially positioned inside the housing.
  • the drive 3 is designed as an electric motor.
  • the electric motor is a brushless electric motor.
  • the drive 3 is designed as an electric motor with carbon brushes.
  • the drive 3 designed as an electric motor contains a rotor and a stator.
  • the rotor is positioned inside the stator such that the rotor can rotate relative to the stator.
  • the rotor is driven by the stator so that the rotor can generate torque. Neither the rotor nor the stator are shown in the figures.
  • the tool holder 8 is positioned at a lower end of the housing 2 of the machine tool 1 .
  • a tool 9 can be picked up and held with the aid of the tool holder 8 .
  • the tool 9 is designed as a chisel.
  • the energy supply device 7 is provided on the first side wall 2a of the housing 2 of the machine tool 1 .
  • the energy supply device 7 is a power supply connection and a power supply cable.
  • a free end of the power cord may be connected to a power outlet (also called an outlet) (not shown in the figures).
  • the machine tool 1 and in particular the drive 3 designed as an electric motor can be supplied with energy, for example with electrical energy.
  • the energy supply device 7 can also be designed as a single battery or as a plurality of batteries: With the help of one or more battery interfaces, the individual or more batteries on or in the housing 2 can be connected Machine tool 1 positioned.
  • the drive 3 is designed as an electric motor in the present embodiment of the machine tool 1 .
  • the drive 3 can also be an internal combustion engine.
  • the energy supply device 7 is designed as a fuel tank.
  • the drive 3 can also be designed in the form of a pneumatic drive or compressor.
  • the energy supply device 7 can be a compressed air connection or compressed air supply on or in the machine tool 1 .
  • the drive 3 designed as a brushless electric motor is used to generate a torque.
  • the torque generated by the drive 3 can be transmitted in the form of impact pulses to the tool holder 8 and finally to the tool 9 designed as a chisel.
  • the transmission device 6 can also be referred to as a percussion mechanism and essentially contains a piston-cylinder device.
  • the piston-cylinder device contains a piston that is moved back and forth in the cylinder. The higher the frequency of the piston in the cylinder, the higher the impact pulse frequency and the more impact energy can be generated and ultimately transferred to the tool.
  • the control device 4 is connected to the first and second handle device 5 and to the drive 3 . Signals and communication data can thus be sent and received between the handle devices 5, the drive 3 and the control device 4.
  • the control device 4 is used to control and regulate the different functions of the machine tool 1 and in particular to set the parameters or operating parameters of the drive 3. With the help of the control device 4, the speed can thus specifically determine the speed value of the drive 3 configured as an electric motor as a parameter or operating parameter to be set.
  • the first handle device 5 is movably positioned on a first side wall 2a of the housing 2 and the second handle device 5 is movably positioned on a second side wall 2b of the housing 2 .
  • both the first and the second handle device 5 each contain a lever element 10 and a handle piece 11.
  • the respective lever element 10 of the first and second handle device 5 is pivotably mounted in the direction of rotation C or D via a corresponding pivot point D1 .
  • the first and second handle device 5 is used for holding and guiding the machine tool 1 by a user. The user is not shown in the figures.
  • the handle device 5 is shown in the form of an exemplary embodiment.
  • the handle device 5 essentially contains a lever element 10, a handle 11, an activation element 12, a sensor device 13 and a signal transmitter 14.
  • the activation element 12 designed as an activation switch serves to activate the drive 3 of the machine tool 1.
  • the activation element 12 can be brought reversibly from a first position into a second position by exerting a force in direction S.
  • the activation element 12 is shown in the first position, i.e. in a non-depressed state.
  • the first position corresponds to the top position.
  • the drive 3 is activated as soon as the activation element 12 is moved from the first position into the second position.
  • the activation element 12 is shown in the second position, i.e. in a pressed state.
  • the activation element 12 is connected to the control device 4 in such a way that signals can be exchanged between the activation element 12 and the control device 4 .
  • the connection between the activation element 12 and the control device 4 is not shown in the figures.
  • the respective position, i.e. the first or second position, of the activation element 12 is transmitted to the control device 4 with the aid of a corresponding signal.
  • the first and second positions can be determined in the control device 4 from the corresponding signals.
  • the transmission device 6 designed as a percussion mechanism is activated or started not only by pressing the activation element 12 in the direction of the arrow S.
  • the sensor device 13 is connected to the control device 4 in such a way that signals, data and information can be exchanged between the sensor device 13 and the control device 4 .
  • the sensor device 13 can also be integrated in a circuit board of the control device. The circuit board is not shown in the figures.
  • the lever element 10 is designed essentially as an elongate lever arm with a first end 10a and a second end 10b and with an upper and lower side 10c, 10d.
  • the first end 10a of the lever element 10 is mounted reversibly pivotable in a direction of rotation C or D via the pivot point D1 in relation to the housing 2 of the machine tool 1 .
  • the lever member 10 pivots about the pivot point D1 in the direction of rotation C.
  • the lever member 10 pivots about the Pivot D1 with the aid of a first spring element 15 in the direction of rotation D back to the starting position.
  • the first spring element 15 can be designed in the form of a spiral spring or a torsion bar spring.
  • the signal transmitter 14 is firmly connected to the lever element 10 and is designed in the form of a magnet.
  • the magnet can be a permanent magnet.
  • the signal transmitter 14 designed as a magnet is positioned on the lever element 10. FIG. By being positioned on the lever element 10, the signal transmitter 14 can be moved relative to the housing 2 of the machine tool 1.
  • the sensor device 13 is positioned on the first side wall 2a of the housing 2 of the machine tool 1 and essentially contains a first, second and third Hall sensor 16a, 16b, 16c.
  • At least one 3D Hall sensor can also be used instead of the Hall sensors.
  • the three Hall sensors 16a, 16b, 16c are positioned one below the other in direction A on the housing 2 of the machine tool 1.
  • Hall sensors 16a, 16b, 16c are positioned on housing 2 of machine tool 1 in such a way that at least one of the three Hall sensors 16a, 16b, 16c can always detect the position of signal transmitter 14, which is designed as a magnet, when lever element 10 is in direction of rotation C or D is pivoted.
  • more or fewer than three Hall sensors can also be provided.
  • only one 3D Hall sensor can be present.
  • the Hall sensor can be an analog sensor.
  • FIG. 2a shows the activation element 12 and in a first position. In this first position, the handle device 5 and signal generator 14 are in the uppermost position in direction B.
  • the signal generator 14 designed as a magnet is positioned in such a way that the first Hall sensor 16a (i.e. the uppermost one in direction B) of the sensor device 13 can detect the magnet.
  • the sensor device 13 thus detects that the signal transmitter 14 and also the handle device 5 are in the uppermost position.
  • a corresponding signal is sent to the control device 4.
  • the signal informs the control device 4 that the user is not yet exerting any force on the handle device 5 in direction A.
  • a user exerts a first force in direction A on the activation element 12 and the handle device 5 .
  • the activation element 12 is brought from the first position into the second position.
  • the drive 3 is then activated, i.e. the rotor of the drive 3 rotates and generates a torque.
  • the handle device 5 and thus the lever element 10 are pivoted about the pivot point D1 in the direction of rotation C.
  • the control device 4 determines the difference between a maximum distance S2 of the lever element 10 and the first determined distance S1.
  • the maximum distance S2 corresponds to the lowest or deepest position Handle device 5 in direction A, see Figure 2c.
  • the more Hall sensors 16a, 16b, 16c are contained in the sensor device 13, the more precisely the position of the signal generator 14 relative to the sensor device 13 and finally the difference between a maximum distance S2 of the lever element 10 and the first determined distance S1 can be determined .
  • a maximum possible continuous linear position determination over the entire (ie the maximum possible) distance S2 can be determined.
  • the control device 4 sets a first speed for the drive 3 when the determined difference between the maximum distance S2 of the lever element 10 and the determined distance S1 corresponds to at least a predetermined threshold value.
  • the threshold is 50%. So if the first distance S1 is determined as 50% or half of the maximum distance S2, the control device 4 sets a speed or a speed value for the drive 3 that corresponds to 50% or half of the maximum speed of the drive 3. In other words: if the control device 4 determines that the handle device 5 is pressed halfway or 50% of the possible distance in direction A, half or 50% of the maximum possible speed for the drive 3 is set. By setting the speed to half or 50% of the maximum possible speed for the drive 3, only half or 50% of the maximum possible impact frequency and half or 50% of the maximum possible power is generated by the transmission device 6.
  • the second rotational speed is the maximum rotational speed of the drive 3.
  • the maximum rotational speed corresponds to the nominal rotational speed of the drive 3.
  • the predetermined time period is one second. In other words: the user moves the handle device 5 halfway the possible distance S2 in direction A and a first speed is set, after one second a second, higher speed is set. Due to the higher speed, a correspondingly higher impact frequency and power is generated by the transmission device 6 and transmitted to the tool 9 .
  • the nominal speed or the full or also maximum speed for the drive 3 is set either by the sudden setting of the handle device 5 from the first into the third position, cf. Figure 2c, or by adjusting the handle device 5 from the first to the second position and additionally after the predetermined period of time after the second position has been reached.
  • FIG. 2c a second force is exerted on the handle device 5 in direction A.
  • FIG. The second force is greater than the first force.
  • the activation element 12 is still in the second (i.e. depressed) position.
  • the drive 3 continues to be activated by pressing the activation element 12 in direction S.
  • the lever element 10 is pivoted further in the direction of rotation C than in FIG. 2b.
  • the lever element 10 is pivoted so far that the handle device 5 moves into a third position and the signal transmitter 14 positioned on the lever element 10 is at the level of the third (i.e. lowest) Hall sensor 16c.
  • the sensor device 13 thus detects that maximum pressure is being exerted on the handle device 5 and that the handle device 5 is in a third or lower (i.e. lowest) position.
  • a corresponding signal is sent to the control device 4.
  • the signal informs the control device 4 that the user is exerting a maximum force on the handle device 5 .
  • the control device 4 controls the drive 3 designed as an electric motor in such a way that a second speed for the drive 3 is set depending on the maximum force exerted on the handle device 5 .
  • the second speed value is higher than the first speed value.
  • a second value for impact frequency and power is given by the transmission device 6 to the tool 9 as a result of the second rotational speed.
  • the setting of the maximum possible speed for the drive 3 or for setting the maximum possible impact frequency and power of the transmission device 6 is effected either by the handle device 5 being moved directly from the first to the third position (cf. Figure 2a and 2c), or by the handle device 5 being moved to the second position (see FIG. 2b) and remaining there for one second.
  • the control device 4 is designed to set a specific speed for the drive 3 .
  • a first and second position of the lever element 10 with the signal generator 14 relative to the sensor device 13 is initially detected by the sensor device 13 .
  • the second position is in direction A below the first position and is therefore the first position closer to the tool 9.
  • the data of the first and second position are sent from the sensor device 13 to the control device 4.
  • the third speed is also higher than the first and second speeds. Due to the increased (i.e. third) speed for the drive 3, an increased impact energy is also generated by the transmission device 6 and transmitted to the tool 9.

Landscapes

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

Abstract

L'invention concerne un procédé de commande en boucle ouverte et en boucle fermée d'une machine-outil, en particulier un marteau burineur, contenant un organe d'entraînement, un dispositif de commande, un dispositif capteur, un dispositif de transmission et un dispositif poignée, le dispositif poignée contenant un élément levier présentant un émetteur de signal qui peut pivoter par rapport au dispositif capteur. Des première et seconde positions de l'émetteur de signal sont détectées par le dispositif capteur, la distance entre les première et seconde positions correspondant à une première distance de course. La différence entre une distance de course maximale de l'élément levier et la première distance de course déterminée est déterminée. Une première vitesse est réglée pour l'organe d'entraînement si la différence déterminée entre la distance de course maximale de l'élément levier et la première distance de course déterminée correspond au moins à une première valeur seuil prédéfinie. Une seconde vitesse est réglée pour l'organe d'entraînement une fois la seconde position de l'émetteur de signal atteinte et une fois un laps de temps prédéfini écoulé.
EP22761053.2A 2021-07-30 2022-07-20 Procédé de commande en boucle ouverte et en boucle fermée d'une machine-outil Pending EP4377049A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP21188656.9A EP4124413A1 (fr) 2021-07-30 2021-07-30 Procédé de commande et de régulation d'une machine-outil
PCT/EP2022/070326 WO2023006538A1 (fr) 2021-07-30 2022-07-20 Procédé de commande en boucle ouverte et en boucle fermée d'une machine-outil

Publications (1)

Publication Number Publication Date
EP4377049A1 true EP4377049A1 (fr) 2024-06-05

Family

ID=77155603

Family Applications (2)

Application Number Title Priority Date Filing Date
EP21188656.9A Withdrawn EP4124413A1 (fr) 2021-07-30 2021-07-30 Procédé de commande et de régulation d'une machine-outil
EP22761053.2A Pending EP4377049A1 (fr) 2021-07-30 2022-07-20 Procédé de commande en boucle ouverte et en boucle fermée d'une machine-outil

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP21188656.9A Withdrawn EP4124413A1 (fr) 2021-07-30 2021-07-30 Procédé de commande et de régulation d'une machine-outil

Country Status (4)

Country Link
US (1) US20240316743A1 (fr)
EP (2) EP4124413A1 (fr)
CN (1) CN117460599A (fr)
WO (1) WO2023006538A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3766639A1 (fr) * 2019-07-18 2021-01-20 Hilti Aktiengesellschaft Machine-outil manuelle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10014314B4 (de) * 2000-03-23 2004-04-15 Hilti Ag Verfahren und Einrichtung für handgeführte Werkzeugmaschinen zur optimierten Bearbeitung verschiedener Untergründe durch Energieanpassung
EP3822031A1 (fr) * 2019-11-14 2021-05-19 Hilti Aktiengesellschaft Procédé de commande et de régulation d'une machine-outil

Also Published As

Publication number Publication date
CN117460599A (zh) 2024-01-26
EP4124413A1 (fr) 2023-02-01
US20240316743A1 (en) 2024-09-26
WO2023006538A1 (fr) 2023-02-02

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