EP3219438A1 - Meuleuse - Google Patents

Meuleuse Download PDF

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Publication number
EP3219438A1
EP3219438A1 EP17152336.8A EP17152336A EP3219438A1 EP 3219438 A1 EP3219438 A1 EP 3219438A1 EP 17152336 A EP17152336 A EP 17152336A EP 3219438 A1 EP3219438 A1 EP 3219438A1
Authority
EP
European Patent Office
Prior art keywords
grinding
grinding device
sanding pad
rotary drive
housing
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.)
Granted
Application number
EP17152336.8A
Other languages
German (de)
English (en)
Other versions
EP3219438B1 (fr
Inventor
Hans-Jürgen MULTHAMMER
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.)
ASIS GmbH
Original Assignee
ASIS GmbH
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 ASIS GmbH filed Critical ASIS GmbH
Publication of EP3219438A1 publication Critical patent/EP3219438A1/fr
Application granted granted Critical
Publication of EP3219438B1 publication Critical patent/EP3219438B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material
    • B24D9/085—Devices for mounting sheets on a backing plate

Definitions

  • the invention relates to a grinding device with a housing, a rotary drive, which is arranged in or on the housing, and a sanding pad, which is rotatable relative to the housing and driven eccentrically by the rotary drive, according to the preamble of claim 1.
  • a generic grinding device for example, from the EP 2 842 689 B1 out.
  • the disc-shaped grinding medium can be automatically released from the grinding disc.
  • recesses are provided on the sanding plate so that the grinding wheel to be removed can be engaged behind by a removal device. So a reliable removal of the disc is possible. After applying a new grinding wheel then grinding can be continued.
  • a motorized hand grinder which may also be referred to as an orbital sander.
  • the sanding disk is freely rotatably supported by the grinding medium about an eccentric axis, which is arranged with an eccentric distance to a rotational axis of the rotary drive.
  • the invention has for its object to provide a grinding device which is particularly efficient for automatic grinding operation in particular.
  • the grinding device according to the invention is characterized in that a positioning device is provided, with which the sanding pad can be positioned relative to the housing when it stops in a defined holding position.
  • a basic idea of the invention is not to move the grinding disc into an adjusting unit for positioning the grinding disc, but to provide a positioning device directly on the device with which the grinding disc is brought into a defined holding position relative to the housing when the rotational movement is stopped.
  • the sanding pad always stops in one or more precisely defined holding positions.
  • the robot arm for an automatic grinding wheel change can be moved directly to a pickup without additional measuring and Justiervor réelle. This simplifies the system design and reduces the time required to change the grinding wheel. Since a grinding wheel change in an automatic grinding device is to be carried out many times in one day, so reduces the idle time of the grinding device considerably. At the same time, the useful life of the grinding device increases.
  • a preferred embodiment of the invention is that a grinding wheel is releasably secured to the sanding pad and that the sanding pad along its circumference has at least one release element for releasing the grinding wheel from the sanding pad.
  • the grinding wheel is a disk-shaped abrasive medium, which is fastened detachably to the sanding pad, for example via an adhesive or Velcro connection.
  • the release elements can basically be designed as desired and have the Function to allow a simplified removal of the grinding wheel from the sanding pad.
  • a particularly advantageous embodiment is given according to the invention in that at least one release element is formed as a recess in the sanding pad for engaging behind the grinding wheel.
  • the recess extends up to the support or holding surface on which the grinding wheel is releasably secured.
  • the recess is designed to engage a grip element or a release finger or other element of an automatic release device.
  • a plurality of recesses may be arranged distributed uniformly or non-uniformly along the circumference. Accordingly, one or more gripping means of the release device can be provided.
  • the sanding pad can be constructed in several parts, preferably with a base plate and an adapter disc. In the adapter disk, the recesses are preferably formed, wherein the grinding wheel is detachably arranged on an end face of the adapter disk.
  • the positioning device can be designed as desired. Conceivable are mechanical positioning elements, such as gears or adjusting bolts. According to a development of the invention, it is particularly advantageous that the positioning device comprises at least one magnet.
  • the magnet may in particular be activated, such as electrically or by mechanical delivery.
  • a bar magnet is provided which is electrically responsive by a controller.
  • the sanding plate may be formed magnetically or magnetizable at certain areas, so that a defined mechanical adjustment of the freely rotatable sanding pad is made possible.
  • the sanding pad is rotatably mounted about an eccentric axis, which is arranged with an eccentric distance radially spaced from a rotational axis of the rotary drive.
  • an eccentric element is attached to a drive shaft of the rotary drive, which rotates is driven about the axis of rotation, and that is mounted on the eccentric element of the grinding plate freely rotatable about the eccentric axis.
  • the eccentric distance is a few millimeters to a few centimeters.
  • the sanding pad is preferably not directly driven in the plate-shaped eccentric element, but passively freely rotatably mounted, preferably via a corresponding rolling bearing.
  • the eccentric element is non-rotatably connected to the drive shaft of the rotary drive.
  • the freewheel of the sanding pad can be blocked, for example by a mechanical stop element or magnetically.
  • at least one positioning element in particular an iron core
  • the sanding pad is held in the defined holding position.
  • one or more electromagnets can be achieved in a desired position with an iron core as positioning a reliable adjustment and positional fixation of the sanding pad.
  • the iron cores are preferably located laterally or on a rear side of the sanding plate or the eccentric element and are at a slight distance in the holding position of the electromagnet against the housing.
  • a control is provided, with which the at least one electromagnet can be controlled before the rotary drive is restarted for demagnetizing the positioning element.
  • the electromagnet can be reversed for a short time, so that the magnetization cancels in the iron core.
  • electromagnetic resistors can be avoided during grinding operation or at least largely reduced.
  • the rotary drive is an electric motor which is angularly movable and controllable. In this way it can be ensured that the rotary drive with the eccentric element is always stopped in an exact position.
  • the positioning device thus essentially has the purpose of fixing the freely rotatably mounted sanding pad in the desired holding position.
  • the solenoid is actuated to fix the grinding plate. Only then is the rotary drive stopped and moved to the intended holding position of the rotary drive.
  • the rotary drive can be, for example, an electronically controllable stepper motor.
  • suitable rotary drives such as electric synchronous motors, with appropriate control for a precise angular movement and control can be provided.
  • a Hosokawa robot arm is provided at the free end of the housing is arranged with the sanding pad.
  • painted with the grinding device vehicle bodies or other large-scale workpieces can be processed efficiently with a consistent quality.
  • the robot arm is connected to the controller so that the robot arm can travel a predetermined path for machining the workpiece.
  • At least one flushing channel is provided, with which air or another gaseous flushing medium can be introduced into the housing.
  • an overpressure relative to the ambient atmosphere can be set in the housing of the grinding device, in particular in the housing of the rotary drive. This prevents air from entering the case from the outside with fine abrasive particles. This reduces wear on the sensitive bearings. Since even with electric rotary actuators a certain sparking can never be completely ruled out and abrasive particles in the air can be flammable, as well as an explosion-proof grinding device is created.
  • a further preferred embodiment of the invention consists in that a pressure unit is provided with which the sanding pad can be pressed against a workpiece to be machined with a predetermined pressure force.
  • the pressure unit may in particular have a spring mechanism or preferably an actuating cylinder, in particular a pneumatic or hydraulic cylinder. With the pressure unit and certain path differences along the surface of the workpiece can be reliably compensated.
  • a control is provided, with which speed, torque and / or a pressing force of the grinding disc are adjustable.
  • the control values can be fixed or can be varied and readjusted depending on various sensors during the grinding process.
  • a further preferred embodiment of the invention consists in that at least one sensor for detecting an acceleration and / or speed of the sanding disk is provided, that the control is connected to the sensor and that the control unit determines values of rotational speed, torque and / or values determined by the sensor. or pressure force of the sanding pad are controllable.
  • the sensor for detecting an acceleration and / or speed of the sanding disk can in particular be arranged so that it can detect a so-called rattling of the sanding disk.
  • changing, mostly periodic movements of the sanding plate preferably occur in a direction perpendicular to the surface to be processed. Such rattling can lead to an uneven grinding result, which is undesirable.
  • one or more parameters may be changed via the controller, such as a reduction in speed or pressure, or an increase in torque. By these measures, chattering can be reduced or avoided altogether.
  • a further preferred embodiment of the invention is that via the controller, a current consumption of the rotary drive can be detected and that a pressing force of the impression unit is controlled depending on the power consumption.
  • a current consumption of the rotary drive can be detected and that a pressing force of the impression unit is controlled depending on the power consumption.
  • this current consumption is determined by corresponding sensors, wherein when a limit value is exceeded, the pressure force is correspondingly reduced. This will provide the necessary torque the rotary drive, which is predetermined in particular for receiving the predetermined speed, lowered again.
  • the invention need not only comprise a grinder, but may also comprise the entire robotic arm assembly as well as the removal and changing means for removing and replacing the grinding wheel.
  • a grinding device 10 according to the invention Fig. 1 has a box-like housing 12 with cooling fins 14. On an underside of the housing 12, a circular disk-shaped sanding pad 30 is rotatably arranged. Along the circumference of the grinding plate 30 radial suction openings 31 are arranged, sucked with which resulting grinding dust via an exhaust duct 16 from the workpiece to be ground and can be dissipated.
  • the exhaust duct 16 is formed in a lateral housing box 15, in which a control and other components of the grinding device 10 are housed protected.
  • a connecting flange 62 is provided, to which a pressure unit 60 for applying an axial pressure force can be detachably coupled and flanged onto the sanding pad 30 via a central pressure shaft 64.
  • the grinding device 10 with the flanged pressure unit 60 is in Fig. 5 shown.
  • the grinding device 10 is designed as an eccentric grinder, in which the grinding plate 30 is arranged eccentrically to a rotational axis 22 of a rotary drive 18, as clearly illustrated Fig. 6 evident.
  • a drive shaft 20 of the rotary drive 18 is rotatably connected to a disc-shaped eccentric 24.
  • the eccentric 24 is driven by the drive shaft 18 rotatably about the rotation axis 22.
  • About a sanding pad bearing 26 of the sanding pad 30 is mounted eccentrically about an eccentric axis 25 rotatably in the eccentric 24.
  • the eccentric axis 25 has a radial distance to the axis of rotation 22 of the drive shaft 20.
  • the sanding pad 30 is supported in a freely rotating manner relative to the eccentric element 24.
  • the structure of the grinding plate 30 can be seen, which has a conically tapered plate-shaped base plate 32.
  • the base plate 32 is freely rotatably mounted about the eccentric axis 25 with the sanding pad bearing 26.
  • a circular adapter plate 34 is attached at the in Fig. 6 downwardly directed free side of the base plate 32 .
  • radial recesses 35 are introduced. The recesses 35 are used for engaging behind and releasing the grinding wheel 36 which is releasably secured to the adapter plate 34.
  • the grinding wheel 36 is provided on its free side with an abrasive grain to allow grinding.
  • the recesses 35 are used to engage engaging or Abnniefingern a basically known automatic removal device so as to solve the attached via a releasable connection to the adapter plate 34 grinding wheel 36 when worn. Subsequently, a new grinding wheel 36 can be placed on the adapter disk 34 at a change station.
  • the detachable connection may be about an adhesive or Velcro connection, a screw, clamp or clamping connection.
  • a power supply line 46 For a defined stopping of the grinding plate 30 of the drum magnet 44 is electrically activated via a power supply line 46.
  • positioning elements 50 At a rear, directed to the electromagnet region of the grinding plate 30 positioning elements 50 are attached to defined positions, which are formed as a magnetizable iron core.
  • the otherwise non-magnetic grinding disc 30 is thus magnetically fixed in a defined holding position, in which the electromagnet and the iron core lie directly opposite one another.
  • the grinding device 10 can be moved without additional adjustment operations immediately in a removal device for removing and changing the grinding wheel 36.
  • the electromagnet is designed as a bar magnet 42, which can act in a targeted manner on the positioning element 50, which is fixedly attached to the rear side of the grinding plate 30.
  • the positioning element 50 can be demagnetized. This can be done via the electromagnet in the housing 12 itself or via an electromagnet in the sanding pad 30.
  • the electromagnet is activated by a control during or immediately before restarting in accordance with the demagnetization.
  • the sectional view according to Fig. 4 shows the course of the exhaust duct 16 in the housing box 15, which is located laterally on the housing 12.
  • the exhaust duct 16 is connected via hose lines, not shown, with a suction device, in particular a suction pump, so that sanding dust from the area of the sanding pad 30 can be sucked through the suction openings 31.
  • a purge gas into the interior of the housing 12 and the rotary drive 18 via a feed line, not shown Rinse lines 56 are introduced, which schematically in Fig. 6 are shown.
  • an overpressure can be set in the housing 12 so that ambient air with grinding dust can not penetrate into the housing 12. This reduces the expense of sealing and reduces the overall wear of the rotary drive 18 and the bearing of the drive shaft 20.
  • a good wear protection and a total explosion-proof arrangement is achieved.
  • FIG. 7 out Another embodiment of a grinding device 10 according to the invention is related to FIG. 7 out.
  • a sanding pad 30 with a bolt-like axis of rotation 33 is freely rotatably mounted in an eccentric 24, which in turn is rotationally driven via the drive shaft 20.
  • the center axis of the drive shaft 20 has an eccentric distance to the center axis of the bolt-shaped rotation axis 33 of the sanding pad 30.
  • a magnetically responsive positioning element 50 is arranged in the region of the eccentric element 24.
  • radial guides 38 are formed in the eccentric element 24, in which permanent magnets 48 are displaceably mounted between a radially inwardly blocking position and a retracted position.
  • the permanent magnets 48 via a return device 39 in the in FIG. 7 shown blocking position pressed.
  • the permanent magnets 48 With a rising speed of the eccentric 24, the permanent magnets 48 are pressed by the centrifugal force radially outward in its retracted position. In this position, the grinding plate 30 can rotate freely with its axis of rotation 33 in the eccentric 24.
  • the centrifugal force is released, wherein the permanent magnets 48 in the locked position in FIG FIG. 7 be pressed.
  • the permanent magnets 48 cooperate with the magnetizable positioning element 50, so that the sanding pad 30 is stopped and held in a defined angular position relative to the eccentric element 24.
  • With a corresponding angular exact stopping of the drive shaft 20 is so the sanding pad 30 in a precise position, which allows easy removal of a grinding wheel 36.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP17152336.8A 2016-03-15 2017-01-20 Meuleuse Active EP3219438B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202016101430.1U DE202016101430U1 (de) 2016-03-15 2016-03-15 Schleifvorrichtung

Publications (2)

Publication Number Publication Date
EP3219438A1 true EP3219438A1 (fr) 2017-09-20
EP3219438B1 EP3219438B1 (fr) 2018-07-11

Family

ID=55698093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17152336.8A Active EP3219438B1 (fr) 2016-03-15 2017-01-20 Meuleuse

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EP (1) EP3219438B1 (fr)
DE (1) DE202016101430U1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018128390B4 (de) 2018-11-13 2020-10-29 Philipp Ossner Schleifvorrichtung mit Wechseleinrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5595531A (en) * 1995-07-26 1997-01-21 Ryobi North America Random orbit sander having speed limiter
WO2000029170A1 (fr) 1998-11-12 2000-05-25 Robert Bosch Gmbh Ponceuse a main entrainee par moteur
FR2942735A1 (fr) * 2009-03-03 2010-09-10 Abb France Ensemble de montage d'un disque abrasif sur une broche rotative d'un dispositif de poncage
DE202013101858U1 (de) * 2013-04-29 2013-05-17 Sps Holding Gmbh Anlage zum Schleifen von Flächen
EP2842689B1 (fr) 2013-09-03 2015-07-08 Asis Gmbh Dispositif et procédé de remplacement d'une meule
US20160039067A1 (en) * 2012-12-10 2016-02-11 Universite De Nantes Sanding device including means for changing a sanding disk

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5595531A (en) * 1995-07-26 1997-01-21 Ryobi North America Random orbit sander having speed limiter
WO2000029170A1 (fr) 1998-11-12 2000-05-25 Robert Bosch Gmbh Ponceuse a main entrainee par moteur
FR2942735A1 (fr) * 2009-03-03 2010-09-10 Abb France Ensemble de montage d'un disque abrasif sur une broche rotative d'un dispositif de poncage
US20160039067A1 (en) * 2012-12-10 2016-02-11 Universite De Nantes Sanding device including means for changing a sanding disk
DE202013101858U1 (de) * 2013-04-29 2013-05-17 Sps Holding Gmbh Anlage zum Schleifen von Flächen
EP2842689B1 (fr) 2013-09-03 2015-07-08 Asis Gmbh Dispositif et procédé de remplacement d'une meule

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Publication number Publication date
EP3219438B1 (fr) 2018-07-11
DE202016101430U1 (de) 2016-03-23

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