EP1103350A2 - Werkzeugmaschine mit einem Elektromagneten zur Befestigung an einem ferromagnetischen Werkstück - Google Patents
Werkzeugmaschine mit einem Elektromagneten zur Befestigung an einem ferromagnetischen Werkstück Download PDFInfo
- Publication number
- EP1103350A2 EP1103350A2 EP00121732A EP00121732A EP1103350A2 EP 1103350 A2 EP1103350 A2 EP 1103350A2 EP 00121732 A EP00121732 A EP 00121732A EP 00121732 A EP00121732 A EP 00121732A EP 1103350 A2 EP1103350 A2 EP 1103350A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- electromagnet
- machine tool
- switch
- bridge rectifier
- pole
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
- B25H1/0021—Stands, supports or guiding devices for positioning portable tools or for securing them to the work
- B25H1/0057—Devices for securing hand tools to the work
- B25H1/0064—Stands attached to the workpiece
- B25H1/0071—Stands attached to the workpiece by magnetic means
Definitions
- the invention relates to a machine tool with an electromagnet for attachment to a ferromagnetic workpiece, with a switching device with at least two switching states, a working state in which the electromagnet and a Drive device of the machine tool are activated, and a holding state in which the electromagnet, but not the Drive device is activated.
- Such machine tools are usually Power tools, especially drills, with the help a magnetic stand on the workpiece to be machined from ferromagnetic Material can be attached.
- Power tools especially drills
- Such machine tools for example when working on electricity pylons, used in steel construction, when working on beams etc. e.g. to create holes with high Torque must be worked.
- the machine tool mentioned at the outset has a base plate in which an electromagnetic coil for attaching a Drill stand provided when the coil is excited on the workpiece is.
- the coil is controlled via a switching arrangement, whereby responsive to the magnetic flux of the coil, the Power supply to the machine tool in the absence of a predetermined magnetic flux interruption switches are provided are.
- Such a safety device can avoid that the machining process of the workpiece begins, before the electromagnet is activated, but it has been shown that the electromagnet heats up considerably during long periods of work can, especially when performing a variety of machining operations the electromagnet is constantly switched on remains because the machine tool between the individual machining operations not accepted or only removed with great effort or can be removed. Unless a larger number of Machining operations are necessary, such machine tools remain often even several days or weeks in one Workpiece, the electromagnet constantly during this time must remain switched on to ensure fixation on the workpiece. This is with a significant energy consumption connected.
- the invention has for its object the disadvantages of To avoid prior art, in particular one excessive heating of the electromagnet can be counteracted and energy consumption should be reduced as much as possible should.
- the electromagnet from an AC voltage source on hold fed a one-way rectifier while the electromagnet is fed in the working state via a two-way rectifier.
- one simple switch is usually sufficient to switch between one-way and two-way rectification.
- the electromagnet is only in the holding state with a half wave of rectified AC voltage controlled while in working state via the two-way rectifier Both half waves are used to drive the electromagnet to be supplied with pulsating DC voltage.
- the rectifier is expedient in this embodiment formed as a bridge rectifier, the electromagnet between the positive pole and the negative pole of the bridge rectifier is connected and in a branch of the bridge rectifier a switch for switching between working position and stop position is provided.
- the electromagnet is from an AC voltage source via a bridge rectifier fed, with the bridge rectifier on the input side a diode is connected upstream and a switch for Bridging the diode in the working state is provided.
- Such an embodiment is advantageous if a bridge rectifier is used as a complete component, so that the insertion a switch for switching between working position and stop position in a branch of the bridge rectifier not possible.
- the Diode only a half-wave can be used while bridging the diode both half-waves can be used.
- the electromagnet is made from a plurality of individual magnets, being in the holding state only some of the individual magnets are energized is smaller than the majority of the individual magnets which are supplied with voltage in the working state.
- a reduction in the holding force can also be achieved in this way and power consumption in the stopped state, e.g. in this state only one of two individual magnets is energized becomes.
- the electromagnet in the holding state consists of the electromagnet in the holding state only with a series resistor To apply tension.
- an electrical or electronic control element is provided be over which the electromagnet in the holding state with a reduced Electricity is operated.
- Fig. 1 is a circuit for an electromagnet according to the invention for fastening a machine tool to a ferromagnetic workpiece designated overall by the number 10.
- the electromagnet 30 is made via a bridge rectifier 20 an AC voltage source 12, 14 fed.
- the bridge rectifier 20 has four diodes 22, 24, 26, 28 on that to the bridge rectifier circuit in a known manner 20 are interconnected.
- the electromagnet 30 is with its two ends between the negative pole 32 and the positive pole 34 of the bridge rectifier 20 connected.
- one AC connection of the bridge rectifier 20 immediately is connected to the supply voltage pole 14 is the other AC connection of the bridge rectifier 20 via a On / off switch 16 connected to the supply voltage pole 12.
- the other connection of the on / off switch 16 immediately connected to the anode of the diode 26 is the negative pole 32 of the bridge rectifier 20 leading diode 22 over a further on / off switch 18 with the on / off switch 16 connected.
- Both switches 16, 18 together form a switching device, which is labeled with the letter S.
- the circuit 10 now works as follows:
- the switching device S has a total of three switching states, which are caused by the positions of the switches 16, 18.
- On the first switching state of the switching device S is the off state, which is present when the switch 16 is in the position OFF, so that the bridge rectifier 20 and the electromagnet 30 are de-energized.
- a second switching state of the Switching device S is the stop state that is present when switch 16 is in the ON position and switch 18 is in the position is OFF.
- a third switching state of the switching device S is the working state, which results when both switches 16, 18 are closed are.
- the diode 22 of the bridge rectifier 20 powered, so that another Branch of the bridge rectifier 20 is powered by way of the switches 16, 18, the diode 22, the electromagnet 30 and the diode 28 is given, so that the bridge rectifier 20 is now fully used and the Electromagnet 30 is fed from a two-way rectifier, i.e. that both half-waves of the supply voltage are used.
- Such a circuit 10 can be used for a machine tool be with a magnetic base on a ferromagnetic Workpiece (not shown) to be held.
- a ferromagnetic Workpiece (not shown) to be held.
- the electromagnet 30 is located near the surface of the magnetic base Arrangement so that when current flows through the electromagnet 30 the machine tool with its magnetic base on a ferromagnetic Workpiece is tightened so that the machine tool too position and hold in the working position.
- the machine tool is designed as a power tool, there is also Possibility of using such a machine tool with another Drive, e.g. to be equipped with a compressed air drive.
- the circuit 10 according to the invention now has the advantage that the Power consumption of the electromagnet 30 compared to the holding state the current consumption of the electromagnet 30 in the working state is reduced by about 50% since only one is in the holding state Half wave of the AC voltage is used while in working condition both half-waves can be used. This leads to a significantly lower heating of the electromagnet 30, what is particularly noticeable in continuous operation. Likewise there is a drastic reduction in energy consumption, since the power consumption when stopped is reduced by about 50% is. Nevertheless, even in the holding state, the magnetization curve results of the core material of the electromagnet 30 a Holding force of approximately 75% of the holding force of the electromagnet 30 in working condition.
- This value in the holding state is completely sufficient to the machine tool in question before an operation to be positioned exactly on the workpiece or between different ones To hold work processes on the workpiece.
- First during the machining process itself is the full magnetic Flow of the electromagnet 30 is necessary in order to be sufficient Safety reserve against loosening from the workpiece or against a slipping due to the machining forces available to have.
- the machine tools 40, 50 and 60 are Drills equipped with a magnetic base by means of whose the drilling machine when an electromagnet is excited can be fixed on a workpiece.
- the machine tool 40 has a drive shaft that by means of a universal motor is driven, which in Fig. 2 with the Reference numeral 42 is indicated.
- a switching device is again used to control the circuit S provided that a two-pole main switch 16, 17 and includes a motor switch 18.
- the two-pole main switch 16, 17 is connected to the two supply voltage poles 12, 14 via a Mains plug can be connected.
- the two outputs of the two-pole main switch 16, 17 are in turn connected to a bridge rectifier 20 between whose negative pole 32 and positive pole 34 are connected to an electromagnet 30 is.
- the bridge rectifier 20 in turn consists of four diodes 22, 24, 26, 28, which in a known manner, as in Fig. 1 explained, are connected.
- the diode 22 is on the Output of the motor switch 18 connected as On / off switch is formed.
- the universal motor 42 is also connected, which via a speed control 44 and the second pole 17 of the Main switch 16, 17 with the other pole 14 of the supply voltage source connected is.
- the motor switch 18 is used to switch the motor 42 on and off, at the same time switching the electromagnet 30 between stop state and working state.
- FIG. 3 A further modification of the machine tool 40 according to FIG. 2 is shown in Fig. 3 and generally designated by the number 50.
- the only difference from the embodiment according to FIG. 2 is that instead of a single pole motor switch 18 a two-pole motor switch 18, 19 is now provided.
- the motor 42 via the pole 16 of the main switch 16, 17 with the first pole 12 connects the AC voltage source, connects the second pole 19 of the engine switch, with the pole 18 of the engine switch is coupled for joint actuation, the cathode of the diode 22 via the first pole 16 of the main switch 16, 17 with the pole 12 of the AC voltage source.
- Machine tool 50 is shown in FIG. 4 and overall designated with the number 60.
- the electromagnet 30 is between the positive pole 34 and the negative pole 32 of the bridge rectifier 62 connected.
- the bridge rectifier 62 is connected to an AC input at the output of the second pole 17 of the main switch 16, 17, which is connected to the pole 14 of the mains voltage, while the other AC input of the bridge rectifier 62 via the pole 16 of the main switch 16, 17 and a diode 64 is connected to the other pole 12 of the mains voltage.
- a two-pole motor switch 18, 19 The motor 42 is above the first Pole 18 of the motor switch to the output of the first pole 16 of the main switch 16, 17 connected.
- the second pole 19 of the motor switch is on the input side with the first pole 18 connected and connected to the cathode of the diode 64 on the output side, the one with the input side of the bridge rectifier 62 is connected.
- the switching device S, the main switch 16, 17 and the Motor switch 18, 19 includes, in turn, as before using described by Fig. 1, three switching states.
- In the first switching state are both the main switch 16, 17 and the engine switch 18, 19 in the OFF position.
- the motor switch is added 18, 19 closed, so in this third switching state the diode 64 through the second pole 19 of the motor switch 18, 19 bridges, so that the bridge rectifier 62 now is coupled to the mains voltage and thus both half-waves the AC voltage used for the electromagnet 30 become.
- 5 and 6 are two further circuit variants of the Invention shown schematically with which the current by the electromagnet 30 in the holding state compared to the Can reduce current in the working state.
- the circuit 70 is used to supply the electromagnet 30 a DC voltage source with poles 72 and 74 is provided.
- the electromagnet 30 is a series resistor 76 and On / off switch 16 with both poles 72, 74 of the DC voltage source connected.
- Parallel to the series resistor 76 is a single-pole on / off switch 78 connected through which the Series resistor 76 can be bridged.
- FIG. 6 A modification of the circuit 10 is shown in FIG. 6 and overall designated with the number 80.
- the second single magnet 84 is via a single-pole on / off switch 86 between the positive pole 34 and the Minus pole 32 of the bridge rectifier 20 connected.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
Description
- Fig. 1
- eine erste Schaltung zur erfindungsgemäßen Ansteuerung eines Elektromagneten, anhand derer das Prinzip der Erfindung verdeutlicht wird;
- Fig. 2
- die Schaltung einer erfindungsgemäßen Werkzeugmaschine in Prinzipdarstellung;
- Fig. 3
- eine abgewandelte Ausführung einer erfindungsgemäßen Werkzeugmaschine;
- Fig. 4
- eine weitere Abwandlung einer erfindungsgemäßen Werkzeugmaschine und
- Fig. 5,6
- zwei weitere Prinzipschaltungen von abgewandelten Ausführungen der Erfindung.
Claims (7)
- Werkzeugmaschine mit einem Elektromagneten (30) zur Befestigung an einem ferromagnetischen Werkstück, mit einer Schalteinrichtung (S) mit mindestens zwei Schaltzuständen, einem Arbeitszustand, in dem der Elektromagnet (30) und eine Antriebseinrichtung (42) der Werkzeugmaschine (40, 50, 60) aktiviert sind, und einem Haltezustand, in dem der Elektromagnet (30), nicht jedoch die Antriebseinrichtung (42) aktiviert ist, dadurch gekennzeichnet, daß Mittel (18, 19, 64, 76, 78, 86) vorgesehen sind, durch die der Strom des Elektromagneten (30) im Haltezustand gegenüber dem Strom des Elektromagneten (30) im Arbeitszustand reduziert ist.
- Werkzeugmaschine nach Anspruch 1, dadurch gekennzeichnet, daß der Elektromagnet (30) aus einer Wechselspannungsquelle (12, 14) im Haltezustand über einem Einweggleichrichter (24, 26) gespeist ist, und daß der Elektromagnet (30) im Arbeitszustand über einen Zweiweggleichrichter (22, 24, 26, 28) gespeist ist.
- Werkzeugmaschine nach Anspruch 2, dadurch gekennzeichnet, daß der Gleichrichter als Brückengleichrichter (20) ausgebildet ist, daß der Elektromagnet (30) zwischen dem Pluspol (34) und dem Minuspol (32) des Brückengleichrichters (20) angeschlossen ist, und daß in einem Zweig des Brükkengleichrichters (20) ein Schalter (18, 19) zur Umschaltung zwischen Arbeitsstellung und Haltestellung vorgesehen ist.
- Werkzeugmaschine nach Anspruch 1, dadurch gekennzeichnet, daß der Elektromagnet (30) aus einer Wechselspannungsquelle (12, 14) über einen Brückengleichrichter (62) gespeist ist, daß dem Brückengleichrichter (62) eingangsseitig eine Diode (62) vorgeschaltet ist, und daß ein Schalter (19) zur Überbrückung der Diode (62) im Arbeitszustand vorgesehen ist.
- Werkzeugmaschine nach einem der vorhergedenden Ansprüche, dadurch gekennzeichnet, daß der Elektromagnet (30) aus einer Mehrzahl (n) von Einzelmagneten (82, 84) besteht, und daß im Haltezustand nur ein Teil (m) der Einzelmagnete (82, 84) mit Spannung beaufschlagt ist, der kleiner als die Mehrzahl (n) der Einzelmagnete (82, 84) ist, die im Arbeitszustand mit Spannung beaufschlagt sind.
- Werkzeugmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Elektromagnet (30) im Haltezustand über einen Vorwiderstand (76) mit Spannung beaufschlagt ist.
- Werkzeugmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein elektrisches oder elektronisches Steuerelement (78) vorgesehen ist, über das der Elektromagnet (30) im Haltezustand mit einer geringeren Leistung als im Arbeitszustand betrieben ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19956155 | 1999-11-23 | ||
DE1999156155 DE19956155B4 (de) | 1999-11-23 | 1999-11-23 | Werkzeugmaschine mit einem Elektromagneten zur Befestigung an einem ferromagnetischen Werkstück |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1103350A2 true EP1103350A2 (de) | 2001-05-30 |
EP1103350A3 EP1103350A3 (de) | 2001-12-19 |
EP1103350B1 EP1103350B1 (de) | 2009-01-28 |
Family
ID=7929930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20000121732 Expired - Lifetime EP1103350B1 (de) | 1999-11-23 | 2000-10-05 | Werkzeugmaschine mit einem Elektromagneten zur Befestigung an einem ferromagnetischen Werkstück |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1103350B1 (de) |
DE (2) | DE19956155B4 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2147755A2 (de) | 2008-07-23 | 2010-01-27 | C. & E. FEIN GmbH | Bohrmaschine, insbesondere Kernlochbohrmaschine, sowie Verfahren zum Steuern einer solchen |
EP2251154A1 (de) * | 2009-05-13 | 2010-11-17 | C. & E. Fein GmbH | Magnetbohrständer mit Überwachung der Haltekraft |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202020101768U1 (de) | 2020-04-01 | 2021-07-05 | C. & E. Fein Gmbh | Magnetfuß |
DE202020104209U1 (de) | 2020-07-21 | 2021-10-22 | C. & E. Fein Gmbh | Schaltungsanordnung |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3371257A (en) | 1964-01-30 | 1968-02-27 | Gen Automation Mfg Inc | Motor controls for electro-magnetic base tool |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2932194A (en) * | 1956-10-29 | 1960-04-12 | Buck Mfg Company | Magnetically supported portable tools |
US4278371A (en) * | 1980-02-29 | 1981-07-14 | Milwaukee Electric Tool Corporation | Safety interlock for electro-magnetic drill stand |
JPS57184614A (en) * | 1981-04-30 | 1982-11-13 | Hitachi Koki Co Ltd | Magnetic drilling machine |
US4591301A (en) * | 1984-12-12 | 1986-05-27 | Black & Decker Inc. | Magnetic base machine tool |
DE3620699C2 (de) * | 1986-06-20 | 1995-12-14 | Wolfcraft Gmbh | Aufspannvorrichtung für eine Handbohrmaschine |
US5126643A (en) * | 1991-06-24 | 1992-06-30 | Rotabroach Limited | Control system for hole cutting machines |
-
1999
- 1999-11-23 DE DE1999156155 patent/DE19956155B4/de not_active Expired - Fee Related
-
2000
- 2000-10-05 EP EP20000121732 patent/EP1103350B1/de not_active Expired - Lifetime
- 2000-10-05 DE DE50015540T patent/DE50015540D1/de not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3371257A (en) | 1964-01-30 | 1968-02-27 | Gen Automation Mfg Inc | Motor controls for electro-magnetic base tool |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2147755A2 (de) | 2008-07-23 | 2010-01-27 | C. & E. FEIN GmbH | Bohrmaschine, insbesondere Kernlochbohrmaschine, sowie Verfahren zum Steuern einer solchen |
CN101633057A (zh) * | 2008-07-23 | 2010-01-27 | C.&E.泛音有限公司 | 钻孔机和用于控制钻孔机的方法 |
DE102008035308A1 (de) | 2008-07-23 | 2010-01-28 | C. & E. Fein Gmbh | Bohrmaschine, insbesondere Kernlochbohrmaschine, sowie Verfahren zum Steuern einer solchen |
US8568066B2 (en) | 2008-07-23 | 2013-10-29 | C. & E. Fein Gmbh | Core hole drilling machine |
CN101633057B (zh) * | 2008-07-23 | 2014-08-20 | C.&E.泛音有限公司 | 钻孔机和用于控制钻孔机的方法 |
EP2251154A1 (de) * | 2009-05-13 | 2010-11-17 | C. & E. Fein GmbH | Magnetbohrständer mit Überwachung der Haltekraft |
US8545139B2 (en) | 2009-05-13 | 2013-10-01 | C & E Fein Gmbh | Magnetic drilling stand with holding force monitoring |
Also Published As
Publication number | Publication date |
---|---|
DE50015540D1 (de) | 2009-03-19 |
EP1103350A3 (de) | 2001-12-19 |
DE19956155B4 (de) | 2011-12-01 |
DE19956155A1 (de) | 2001-05-31 |
EP1103350B1 (de) | 2009-01-28 |
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