EP1815148A1 - Verfahren zur steuerung der druckversorgung einer an eine druckquelle angeschlossenen hydraulischen kolben-zylindereinheit und hydraulische antriebseinrichtung - Google Patents
Verfahren zur steuerung der druckversorgung einer an eine druckquelle angeschlossenen hydraulischen kolben-zylindereinheit und hydraulische antriebseinrichtungInfo
- Publication number
- EP1815148A1 EP1815148A1 EP05826539A EP05826539A EP1815148A1 EP 1815148 A1 EP1815148 A1 EP 1815148A1 EP 05826539 A EP05826539 A EP 05826539A EP 05826539 A EP05826539 A EP 05826539A EP 1815148 A1 EP1815148 A1 EP 1815148A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- stroke
- cylinder unit
- drive device
- pressure medium
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 8
- 230000000007 visual effect Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
- B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
Definitions
- the invention relates to a method for controlling the pressure supply of a hydraulic piston-cylinder unit connected to a pressure source and to a hydraulic drive device having a piston-cylinder unit closed to a pressure source according to the preamble of the independent claims 1 and 5.
- Piston-cylinder units are very often used to carry out a work operation in repeated load strokes and return strokes.
- An application consists, for example, in power wrenches, in which the piston-cylinder unit continues to rotate a ratchet wheel by an angle segment by means of a latching pawl so as to exert on a screw a particularly high tightening torque.
- DE 4241 764 A1 discloses a hydraulic circuit for the automatically repeated actuation of a retractable and retractable hydraulic cylinder, in which the end of the movement of the hydraulic cylinder is detected via a flow measurement in the tank line and via a corresponding signal is used for reversing the stroke movement of the hydraulic cylinder.
- a flow sensor By arranging a flow sensor in the line between the actuating valve of the hydraulic cylinder and the tank, a single measuring device for the switching of the cylinder movement as well as for the switching is used when reaching a limit force before the end of the stroke.
- the flow sensor of this hydraulic circuit has an adjustable throttle and an adjustable pressure switch, which opens or closes a contact when a predetermined pressure is exceeded and makes the contact step undone when the pressure falls below the pressure.
- EP 0 297 515 A1 discloses a device for exerting a torque and an angular displacement in a screwing device, in which the angular displacement is detected by an incremental flow measurement.
- the incremental flow is directly proportional to the movement of a piston whose travel causes an angular displacement.
- the invention is based on the object of further developing a method for controlling the pressure supply of a hydraulic piston-cylinder unit connected to a pressure source and a hydraulic drive device with a piston-cylinder unit connected to a pressure source, in particular for a hydraulic screwdriver of the type described in the introduction, that the above-described disadvantages are eliminated and a reversal of the piston-cylinder unit with minimal technical and energy expenditure is possible.
- time measurements and associated timers and timers should be avoided.
- the method for controlling the pressure supply of a piston-cylinder unit connected to a pressure source which actuates a hydraulic wrench, should also be designed such that a tightening torque is achieved independently of the judgment of an operator of the hydraulic wrench.
- the basic idea of the invention is to detect the quantity of a fluidic pressure medium displaced per load stroke independently of the set operating pressure and to perform a changeover to the return stroke only when the detected quantity of the displaced fluidic pressure medium reaches or exceeds a predefinable value. If this is not the case, the operation is terminated, ie a switchover to the return stroke is no longer done and there is an optical and / or acoustic signal output at the same time.
- the predefinable value can be determined and stored in advance by means of a simple calibration. Thus, only the amount of a fluidic pressure medium displaced during a load stroke is compared with a predeterminable amount and, based on this comparison, a control of the piston-cylinder unit is undertaken. A time measurement is not required here. The signal output signals an operator that the tightening torque has been reached.
- an advantageous embodiment provides that a signal which is characterized by a quantity detection means and which displaces the amount of fluidic pressure medium displaced per working stroke is compared with a stored signal in a control device and a switchover to the return stroke is effected as a function of this comparison.
- the signal preferably comprises a plurality of electrical pulses.
- the number of pulses is compared with a predeterminable value determined during the calibration process, which value is stored in a memory of the electronic control unit, and a switching valve is activated if the number of pulses is greater than or equal to the stored value , In this case, switching immediately or without loss of time from the load or working stroke in the return stroke or vice versa.
- the quantity detecting means is preferably arranged in the conduit between the space of the piston-cylinder unit in which the piston rod is located and a switching valve of the hydraulic drive means. Since the displaced amount at a load stroke corresponds to the inflowing amount in a return stroke, an automatic reversal of a load stroke in a return stroke is possible without an unnecessary pressure build-up with the vor ⁇ mentioned disadvantages. As a result, in particular during the load stroke and the return stroke the full working travel of the piston-cylinder unit is achieved, whereby an optimum effect, for example, of a torque wrench is achieved. Further advantages and features of the invention are the subject matter of the fol lowing description and the drawings of an embodiment Ausrete ⁇ .
- the drawing schematically shows a hydraulic drive device used by the invention.
- the piston performs 19 load strokes and return strokes.
- a cylinder space 28 is charged with a high-pressure pressure medium by means of a hydraulic line 14.
- a cylinder chamber 20 is acted upon by a hydraulic line 13 with a pressure medium under low pressure.
- a hydraulic drive device 29 is provided which has a single-stage or multi-stage pump 11, a switching valve 12, a control device 16 and a quantity detection means 15.
- the pump 11 delivers from a tank 10, the pressure medium, which is supplied through the Umschaitventil 12 at a load stroke via the line 14 to the pressure chamber 28 and a return stroke via the line 13 to the pressure chamber 20.
- the quantity detection means 15 detects the backflow of the cylinder chamber 20 into the tank 10 during a load stroke and, in the event of a return stroke, the amount conveyed from the tank 10 into the cylinder chamber 20.
- the quantity detecting means 16 outputs a signal comprising a plurality of electrical pulses, which signal is supplied to the control device 16 via an electrical line 17. There it is compared with a stored in a (not shown) memory signal and made depending on the comparison, a reversal of the valve 12, so that a reversal of a load stroke in a return stroke or vice versa takes place.
- a calibration button 27 is provided which is actuated during a full working stroke. During this work, the number of pulses is detected and stored. A changeover from a load stroke to a return stroke takes place as long as the stored value is reached or exceeded. If this is not the case and the hydraulic drive device, that is to say the torque wrench, is stationary, a further load stroke is not possible. In this case, the desired tightening torque is achieved.
- control device 16 registers the failure or failure to reach the stored value and transmits a signal to a control light in a remote control.
- an operator additionally receives a signal which indicates that the pre-set torque of the hydraulic torque wrench has been reached. This ensures that the achievement of precise torques is no longer dependent on accidental Estimate an operator are dependent, but is set exactly and is indicated by the signal of the indicator light 30.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Valve Device For Special Equipments (AREA)
- Vehicle Body Suspensions (AREA)
- Braking Systems And Boosters (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL05826539T PL1815148T3 (pl) | 2004-11-26 | 2005-11-25 | Sposób sterowania zasilania ciśnieniem hydraulicznego zespołu tłok-cylinder dołączonego do źródła ciśnienia oraz hydrauliczne urządzenie napędowe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004057402A DE102004057402B4 (de) | 2004-11-26 | 2004-11-26 | Verfahren zur Steuerung der Druckversorgung einer an eine Druckquelle angeschlossenen hydraulischen Kolben-Zylindereinheit und hydraulische Antriebseinrichtung |
PCT/DE2005/002121 WO2006056187A1 (de) | 2004-11-26 | 2005-11-25 | Verfahren zur steuerung der druckversorgung einer an eine druckquelle angeschlossenen hydraulischen kolben-zylindereinheit und hydraulische antriebseinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1815148A1 true EP1815148A1 (de) | 2007-08-08 |
EP1815148B1 EP1815148B1 (de) | 2009-06-17 |
Family
ID=36096407
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05826539A Active EP1815148B1 (de) | 2004-11-26 | 2005-11-25 | Verfahren zur steuerung der druckversorgung einer an eine druckquelle angeschlossenen hydraulischen kolben-zylindereinheit und hydraulische antriebseinrichtung |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1815148B1 (de) |
AT (1) | ATE434136T1 (de) |
DE (2) | DE102004057402B4 (de) |
DK (1) | DK1815148T3 (de) |
PL (1) | PL1815148T3 (de) |
WO (1) | WO2006056187A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107971960A (zh) * | 2017-11-20 | 2018-05-01 | 陈壮壮 | 一种用于狭窄空间的液压式扳手 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007036328A1 (de) | 2007-07-31 | 2009-02-05 | Lösomat Schraubtechnik Neef Gmbh | Mobiles Kraftschrauber-Bediengerät |
US11193508B2 (en) | 2018-11-13 | 2021-12-07 | Enerpac Tool Group Corp. | Hydraulic power system and method for controlling same |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4823616A (en) * | 1987-06-29 | 1989-04-25 | Sps Technologies, Inc. | Torque and angular displacement sensing in yield threshold controlled wrenches |
US5592396A (en) * | 1992-08-10 | 1997-01-07 | Ingersoll-Rand Company | Monitoring and control of fluid driven tools |
DE4241764A1 (de) * | 1992-12-11 | 1994-06-16 | Hydrower Hydraulik Gmbh | Hydraulische Schaltung für die automatisch wiederholte Betätigung eines Hydraulikzylinders |
DE29623660U1 (de) * | 1995-12-11 | 1999-04-15 | Volkswagen Ag | Vorrichtung zum Herstellen von Verschraubungen |
DE19702544B4 (de) * | 1996-02-01 | 2005-09-01 | Volkswagen Ag | Verfahren und Vorrichtung zum Herstellen von Schraubverbindungen |
US5668328A (en) * | 1996-07-17 | 1997-09-16 | Applied Power Inc. | Method and apparatus for hydraulically tightening threaded fasteners |
DE19813900A1 (de) * | 1998-03-28 | 1999-09-30 | Frank Hohmann | Hydraulisch betriebener Kraftschrauber und Verfahren zu seiner Herstellung |
DE19952591B4 (de) * | 1999-11-02 | 2004-07-15 | Conti Temic Microelectronic Gmbh | Hydrauliksystem |
US6286412B1 (en) * | 1999-11-22 | 2001-09-11 | Caterpillar Inc. | Method and system for electrohydraulic valve control |
DE10222159A1 (de) * | 2002-05-17 | 2003-11-27 | Paul-Heinz Wagner | Verfahren zur Steuerung einer hydraulischen Kolbenzylindereinheit |
US7124057B2 (en) * | 2003-08-19 | 2006-10-17 | Festo Corporation | Method and apparatus for diagnosing a cyclic system |
-
2004
- 2004-11-26 DE DE102004057402A patent/DE102004057402B4/de not_active Expired - Fee Related
-
2005
- 2005-11-25 AT AT05826539T patent/ATE434136T1/de not_active IP Right Cessation
- 2005-11-25 DK DK05826539T patent/DK1815148T3/da active
- 2005-11-25 EP EP05826539A patent/EP1815148B1/de active Active
- 2005-11-25 WO PCT/DE2005/002121 patent/WO2006056187A1/de active Application Filing
- 2005-11-25 PL PL05826539T patent/PL1815148T3/pl unknown
- 2005-11-25 DE DE502005007532T patent/DE502005007532D1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2006056187A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107971960A (zh) * | 2017-11-20 | 2018-05-01 | 陈壮壮 | 一种用于狭窄空间的液压式扳手 |
CN107971960B (zh) * | 2017-11-20 | 2019-06-14 | 上海舜诺机械有限公司 | 一种用于狭窄空间的液压式扳手 |
Also Published As
Publication number | Publication date |
---|---|
PL1815148T3 (pl) | 2009-11-30 |
WO2006056187A1 (de) | 2006-06-01 |
EP1815148B1 (de) | 2009-06-17 |
DE102004057402B4 (de) | 2007-03-29 |
DE102004057402A1 (de) | 2006-06-01 |
DK1815148T3 (da) | 2009-10-12 |
DE502005007532D1 (de) | 2009-07-30 |
ATE434136T1 (de) | 2009-07-15 |
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