EP2676773B1 - Setzgerät und Steuerungsverfahren - Google Patents

Setzgerät und Steuerungsverfahren Download PDF

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Publication number
EP2676773B1
EP2676773B1 EP13172395.9A EP13172395A EP2676773B1 EP 2676773 B1 EP2676773 B1 EP 2676773B1 EP 13172395 A EP13172395 A EP 13172395A EP 2676773 B1 EP2676773 B1 EP 2676773B1
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EP
European Patent Office
Prior art keywords
piston
compressed air
pressure chamber
pumping
pump
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.)
Active
Application number
EP13172395.9A
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German (de)
English (en)
French (fr)
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EP2676773A1 (de
Inventor
Chafic Abu Antoun
Peter Bruggmueller
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 EP2676773A1 publication Critical patent/EP2676773A1/de
Application granted granted Critical
Publication of EP2676773B1 publication Critical patent/EP2676773B1/de
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/06—Hand-held nailing tools; Nail feeding devices operated by electric power

Definitions

  • the present invention relates to a setting tool according to the preamble of claim 1 for setting fasteners, such as nails, rivets, pins, anchors, brackets or other, preferably pin-shaped, fasteners. Furthermore, the invention relates to a control method according to the preamble of claim 9 for a setting tool.
  • the setting tool according to the invention has a plunger, driven by compressed air drives the fastener.
  • a pumping device generates the compressed air.
  • the pumping device has a pumping cylinder, a pumping piston and an annular magnet arrangement around the pumping cylinder.
  • the pump piston is movable in the pump cylinder along an axis.
  • An axial closure of the pump cylinder with the pump piston completes a pumping volume within the pump cylinder.
  • the annular magnet assembly has a solenoid which encloses the pump cylinder and which at least partially overlaps along the axis with the magnetizable shutter and partially with the magnetizable pump piston.
  • the half-sided closed pump cylinder together with the pump piston, forms a linear piston stroke pump.
  • the drive of the piston stroke pump takes place through the magnet coil, which can pull the magnetizable pump piston into the middle of the magnet coil and thereby compress the air in the pump volume.
  • the placement of the closure within the magnet assembly, preferably within the magnet coil, proves to be efficient for compressing the air.
  • the force needed to compress the air increases approximately inversely with the decreasing distance of the pump piston to the shutter. Due to the arrangement of the magnetizable closure within the magnet arrangement, the force exerted by the magnet coil on the pump piston force also increases approximately inversely to the distance between the closure and the pump piston.
  • the energy can be optimally transferred from the solenoid coil to the volume work of the pumping volume over the entire movement of the pump piston.
  • the closure and the pump piston are preferably formed of a soft magnetic material. As soon as the magnetic coil is de-energized, the shutter and the pump piston are largely unpolarized and are depolarized by surrounding stray fields. Without the solenoid, the shutter and the pump piston will not tighten.
  • An embodiment provides that the closure overlaps at least 10% of the magnet arrangement, preferably the magnet coil, along the axis.
  • the pumping piston preferably overlaps in any position for at least 10% with the magnet assembly, preferably the solenoid, along the axis.
  • An embodiment provides that a pressure chamber, which temporarily stores the compressed air generated by the pumping device.
  • the pumping device does not directly drive the plunger.
  • a volume of the pressure chamber is dimensioned for receiving an amount of air for a setting process or for less than five setting operations.
  • An amount of air taken up by the pump volume is advantageously less than an air quantity intended for the setting process.
  • the pump piston requires several strokes until a required amount of air for the setting process is provided.
  • An embodiment provides that the plunger is rigidly connected to a drive piston, the drive piston within a hollow guide cylinder completes a working volume and the compressed air can be fed into the working volume.
  • the pressure generated by the pumping means and held in the pressure chamber compressed air accelerates the driving piston in the guide cylinder.
  • the plunger is taken by the drive piston and drives the nail or other fasteners.
  • a control method for the setting tool has the steps of: generating compressed air by feeding a current pulse into a solenoid and the generated magnetic field moves a magnetizable pumping piston within the solenoid in a pumping cylinder and accelerating a plunger with the compressed air to a fixing element arranged in the seating direction.
  • the setting tool converts electrical energy, into a magnetic field, into a compression of air and then into kinetic energy of the ram. The conversion of the energy from the magnetic field into the compression is particularly efficient due to the pump piston guided inside the magnet coil.
  • An embodiment provides that a pressure chamber is charged with the compressed air and is accelerated in response to an actuation of an operating element by the user of the plunger with the compressed air from the pressure chamber.
  • the pressure chamber is charged by energizing the solenoid with a sequence of current pulses for reciprocating the pump piston several times.
  • a single stroke for providing the amount of air for the setting process has the obvious advantage that the additional pressure chamber and a buffering of the compressed air is eliminated.
  • the setting tool becomes lighter and has less loss channels. Nevertheless, the multiple stroke proves to be more efficient, since the pumping device operates particularly efficiently, in particular with a short stroke, and thus overcompensates the disadvantages of the additional pressure chamber.
  • An amplitude and / or duration of the current pulses may increase within a sequence.
  • the pumping device performs more volume work per stroke with increasing amount of air in the pressure chamber per stroke, in particular by achieving a higher pressure in order to continue to charge the pressure chamber.
  • Fig. 1 shows an exemplary setting tool 1 for nails 2 or similar pin-shaped fasteners.
  • the setting tool 1 has a compressed air-driven plunger 3, which drives the nail 2 in a workpiece.
  • the compressed air for a setting process is in a Held pressure chamber 4 .
  • a pumping device 5 in the setting device 1 loads the pressure chamber 4 with a sufficient amount of air for the setting process and to the required pressure level.
  • the essential components for the functionality of the setting tool 1 are arranged within a housing 6 , in particular the plunger 3, the pressure chamber 4 and the pump means 5.
  • the user can guide the setting tool 1 with a handle 7 and hold when setting the nails 2 .
  • the handle 7 is inseparable, rigid or by means of damping elements, connected to a housing 6 of the setting device 1 .
  • the setting device 1 is supplied primarily with electrical energy, for example by a battery pack 8, which is inextricably preferably detachably fastened to the handle 7 or the housing 6 by the user.
  • a trigger switch 9 which triggers a setting operation when actuated by the user.
  • a safety mechanism for example, by pressing the setting device to a wall, unlock.
  • the plunger 3 has a striking head 10, which is adapted in shape to the nails 2 used.
  • the impact head 10 typically has about the same diameter as a head of the nails 2.
  • the impact head 10 is guided along a working axis 11 within a nail guide 12 .
  • the nail 2 is inserted for the setting process in the substantially tubular nail receptacle 12 .
  • the insertion can be done manually by the user, semi-automatically or automatically by a feeder.
  • the impact head 10 strikes within the nail guide 12 on the nail 2 and drives the nail 2 in the setting direction 13, along the working axis 11 of the nail guide 12 out, possibly in a workpiece.
  • the plunger 3 is provided at its rear, the nail-remote end with a driving piston 14 .
  • the drive piston 14 preferably has a substantially larger diameter than the impact head 10 to efficiently drive the plunger 3 with the compressed air.
  • the drive piston 14 is inserted into a guide cylinder 15 closed on one side.
  • the drive piston 14 is circumferentially on the inner circumferential surface 16 of the guide cylinder 15 pressure-tight and is guided by the lateral surface along the working axis 11 .
  • a nail 2 facing away from the end of the guide cylinder 15 is closed by a bottom 17 .
  • the drive piston 14 thus closes in the setting direction 13 within the guide cylinder 15 from a pneumatic working volume 18 .
  • the pressure chamber 4 is connected via a controllable supply line 19 with the working volume 18 .
  • the supply line 19 is preferably via an opening in the bottom 17.
  • the supply line 19 includes a switchable valve 20 which is opened in response to an actuation of the trigger switch 9 .
  • the pressure chamber 4 has a sufficient volume to store an amount of air for preferably exactly one setting operation.
  • the volume is, for example, in the range of 100 cm 3 to 300 cm 3 .
  • the pressure is between 7 bar and 10 bar.
  • the pressure chamber 4 is surrounded by a thermally insulating jacket 21 , which, for example, lining a wall of the pressure chamber 4 inside or is applied to the outer surface.
  • the jacket 21 is made of a plastic, for example, preferably made of a foamed plastic.
  • the pumping device 5 ( Fig. 2 ) fills the pressure chamber 4 with air until the time required for the setting process air quantity and / or the pressure necessary for the setting process is reached.
  • the pump device 5 has a linearly moving pump piston 22.
  • the pump piston 22 is guided along the working axis 11, but the pump piston 22 can also be guided along another axis.
  • the pumping piston 22 runs within a hollow pumping cylinder 23.
  • the cross section of the pumping piston 22 and the internal cross section of the pumping cylinder 23 are precisely fitting to ensure a pressure-tight closure. Sealing rings on the pump piston 22 can compensate for manufacturing tolerances.
  • An end face 24 of the pump piston 22 opposite the pump cylinder 23 is closed by a stationary closure 25 .
  • the end face 24 of the pumping piston 22 and the end face 26 of the closure 25 facing it include air in a pumping volume 27 .
  • the pumping piston 22 is moved by a magnetic coil 28 along the axis 11.
  • the magnet coil 28 is arranged around the pump cylinder 23 , preferably the magnet coil 28 is coaxial with the axis 11 of the pump cylinder 23.
  • the drive is based on reluctance forces, which act on the pump piston 22 .
  • the pumping piston 22 is made of a magnetic, preferably ferromagnetic material. The magnetic field generated by the magnet coil 28 in the pump cylinder 23 draws the pump piston 22 into the pump cylinder 23 .
  • the pumping piston 22 is made of a soft magnetic material whose coercive force is less than 1000 A / m. A weak external magnetic field may already change or resolve an existing polarization in the pumping piston 22 . The from the magnetic coil 28 impressed magnetic polarization therefore remains essentially in the pumping piston 22 only for the duration of the magnetic coil 28 applied field.
  • the pumping piston 22 is for example made of ferromagnetic steel, preferably of a soft-annealed steel.
  • the shutter 25 is made of a soft magnetic material, for example, the same material as the pump piston 22.
  • the magnetic field generated by the magnetic coil 28 is introduced from the shutter 25 into the pump cylinder 23 .
  • the magnetic field extends between the end face 24 of the pump piston 22 and the end face 26 of the shutter 25 parallel to the axis 11.
  • the shutter 25 protrudes into the magnet coil 28 along the axis 11 .
  • a front end portion 29 of the solenoid 28 thus overlaps with the shutter 25.
  • the front end portion 29 occupies at least 10% of the solenoid coil 28 .
  • a length 30 of the front end portion 29 is preferably between 10% and 30% of the length 31 of the solenoid coil 28.
  • the pump piston 22 never fully exits the solenoid coil 28 .
  • the pump piston 22 overlaps a rear end portion 32 of the magnet coil 28.
  • the rear end portion 32 has a length 33 of at least 10% of the length 31 of the magnet coil 28 , Preferably up to 20% of the length 31 of the solenoid coil 28.
  • the pumping volume 27 is completely within the magnetic coil 28 having a length 34 of at most 80% of the magnetic coil 28th
  • the pumping volume 27 is significantly less than the volume of the pressure chamber 4.
  • the pumping volume 27 contains less than 20%, preferably between 5% and 10%. the necessary amount of air for a setting process.
  • the efficiency of the pumping device 5 increases strongly non-linearly as the pumping piston 22 approaches the closure 25.
  • the efficiency of the overall system of the setting device 1 is increased by the small pumping volume 27 instead of a pumping volume on the order of the pressure chamber 4 , despite the additional expense Provide pressure chamber 4 and the accompanying pressure chamber 4 losses.
  • the pumping device 5 is controlled by a control device 35 .
  • the control device 35 loads the pressure chamber 4 at the start of operation or after a setting process .
  • the charging takes place through a sequence 36 of current pulses 37 which are fed into the magnet coil 28 ( Fig. 3 ). With each of the current pulses 37 , the pump piston 22 is pulled from its normal position into the magnet coil 28 and compresses the air in the pumping volume 27. A large part of the compressed air flows into the pressure chamber 4 .
  • a spring 39 and / or an additional solenoid 40 the Pull pump piston 22 out of the pump cylinder 23 to the basic position.
  • the pumping volume 27 is vented before the next current pulse 37 .
  • the pump piston 22 releases a ventilation channel 41 as soon as the pump piston 22 moves back into the basic position.
  • the vent passage 41 is opened as soon as the pump piston 22 begins its reverse movement.
  • a position sensor can determine whether the pump piston 22 has reached the home position.
  • the sequence 36 preferably includes at least 5 current pulses 37, preferably at most 30 current pulses 37.
  • the pressure chamber 4 is fully pumped by the pumping device 5 with 5 to 30 strokes.
  • the energy input of the current pulses 37 increases during the sequence 36 ;
  • the duration 42 of the current pulses 37 is increased alternatively or additionally, the amplitude 43 of the current pulses 37 can be increased.
  • the duration 42 and the current / amplitude 43 can be fixed.
  • the current pulses 37 are adjusted so that the pumping piston 22 is pulled from its normal position to the closure 25 , preferably without touching the closure 25 at the end.
  • the force exerted by the solenoid 40 on the pumping piston 22 increases permanently in the selected structure during its movement to the shutter 25 .
  • the characteristic of this increase is similar to the characteristic of the increase in the counterforce built up by the compressed air.
  • the current 43 may be kept constant during a current pulse 37 .
  • the closure 25 is provided with an outlet valve 44, eg a check valve.
  • the outlet valve 44 preferably opens as soon as the pressure in the pumping volume 27 exceeds the pressure in the pressure chamber 4 .
  • the pumping device 5 increases the pressure within the pumping volume only slightly above the pressure in the pressure chamber 4 in order to push the amount of air from the pumping volume 27 into the pressure chamber 4 . The thermal losses occurring during compression can thereby be kept low.
  • the exhaust valve 44 closes as soon as the pump piston 22 moves back to the normal position.
  • the controller 35 preferably first checks if the pressure chamber 4 is charged. If the pressure chamber 4 is uncharged, for example after a prolonged inactivity of the setting device 1, the control device 35 loads the pressure chamber 4. The pressure chamber 4 is loaded with the complete sequence 36 of the current pulses 37 . The controller 35 truncates the sequence 36 if the pressure chamber 4 is partially charged. For example, the control device 35 determines the pressure in the pressure chamber 4 by means of a pressure sensor a control table is stored for each print, how many of the first current pulses 37 of the sequence 36 to skip, ie which of the current pulses 37 of the sequence 36 is to begin. When the pressure chamber 4 is loaded, the control device 35 opens the controllable valve 20.
  • the amount of air under pressure in the pressure chamber 4 accelerates the plunger 3 by means of the drive piston 14.
  • the drive piston 14 is retrieved, for example by means of a pump, a spring , a motor, the user, and the switchable valve 20 are closed.
  • the working volume 18 is preferably ventilated for the retrieval of the driving piston 14 .
  • the control device 35 loads the pressure chamber 4 by means of the sequence 36 of current pulses 37.
  • the magnet coil 28 is preferably surrounded by a magnetic yoke 46 .
  • the yoke 46 covers each of a ring 47, the two end faces 48 of the solenoid coil 28 from.
  • the magnet yoke 46 extends in the radial direction as far as the pump piston 22 or the closure 25 .
  • Ribs 49 of the magnetic yoke 46 which extend parallel to the axis 11 , connect the two rings 47.
  • the magnetic yoke 46 is formed, for example, from individual sheets of a ferromagnetic steel.
  • the pumping piston 22 has a shell-like construction of an outer shell 50 and a core 51.
  • the radially outermost shell 50 is made of a ferromagnetic material.
  • the magnetic field is conducted inside the outer shell 50 .
  • a wall thickness of the outer shell 50 is in the range between 5% and 25% of the diameter of the pump piston 22.
  • a core 51 of the pump piston 22 may be hollow or be filled with a non-metallic material, eg plastic.
  • the end face 26 is preferably a steel plate so as not to deform during compression.
  • the pump piston 22 may be a solid cylinder of a ferromagnetic material, eg steel.
  • Fig. 4 shows an embodiment of the guide cylinder 15 for the driving piston 14 and the pressure chamber 4.
  • the pressure chamber 4 is permanently open to the working volume 18 in the guide cylinder 15 .
  • the driving piston 14 forms the switchable valve 20 and prevents the air in the pressure chamber 4 from flowing out until a setting process is triggered.
  • a locking mechanism 52 such as a pawl, holds the driving piston 14 in its normal position. The locking mechanism 52 can be released by the control device 35 , whereupon the driving piston 14 is pressurized in the setting direction 13 is accelerated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP13172395.9A 2012-06-19 2013-06-18 Setzgerät und Steuerungsverfahren Active EP2676773B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012210347A DE102012210347A1 (de) 2012-06-19 2012-06-19 Setzgerät und Steuerungsverfahren

Publications (2)

Publication Number Publication Date
EP2676773A1 EP2676773A1 (de) 2013-12-25
EP2676773B1 true EP2676773B1 (de) 2014-11-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13172395.9A Active EP2676773B1 (de) 2012-06-19 2013-06-18 Setzgerät und Steuerungsverfahren

Country Status (6)

Country Link
US (1) US20130336809A1 (zh)
EP (1) EP2676773B1 (zh)
JP (1) JP2014000671A (zh)
CN (1) CN103507030A (zh)
DE (1) DE102012210347A1 (zh)
TW (1) TWI624336B (zh)

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US20160340849A1 (en) 2015-05-18 2016-11-24 M-B-W, Inc. Vibration isolator for a pneumatic pole or backfill tamper
TWI587845B (zh) * 2015-12-08 2017-06-21 財團法人金屬工業研究發展中心 擊釘裝置
CA2985234C (en) * 2016-11-09 2023-06-20 Tti (Macao Commercial Offshore) Limited Control system for gas spring fastener driver
TWI804476B (zh) * 2017-11-02 2023-06-11 鑽全實業股份有限公司 氣壓式電動釘槍
US11110577B2 (en) 2017-11-16 2021-09-07 Milwaukee Electric Tool Corporation Pneumatic fastener driver
EP3578316A1 (de) * 2018-06-06 2019-12-11 HILTI Aktiengesellschaft Setzgerät
US11819989B2 (en) 2020-07-07 2023-11-21 Techtronic Cordless Gp Powered fastener driver
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AU2022341977A1 (en) * 2021-09-08 2024-03-14 Illinois Tool Works Inc. Electroportable device

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Also Published As

Publication number Publication date
US20130336809A1 (en) 2013-12-19
DE102012210347A1 (de) 2013-12-19
TW201404551A (zh) 2014-02-01
JP2014000671A (ja) 2014-01-09
TWI624336B (zh) 2018-05-21
EP2676773A1 (de) 2013-12-25
CN103507030A (zh) 2014-01-15
AU2013206295A1 (en) 2014-01-16

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