WO1997045252A1 - Dispositif de commande pour outil a commande hydraulique - Google Patents
Dispositif de commande pour outil a commande hydraulique Download PDFInfo
- Publication number
- WO1997045252A1 WO1997045252A1 PCT/JP1997/000879 JP9700879W WO9745252A1 WO 1997045252 A1 WO1997045252 A1 WO 1997045252A1 JP 9700879 W JP9700879 W JP 9700879W WO 9745252 A1 WO9745252 A1 WO 9745252A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ram
- lower limit
- control device
- switching valve
- limit position
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
Definitions
- the present invention relates to a hydraulically driven tool control device, and more particularly, to a hydraulically driven tool control device for controlling the operation of a hydraulically driven tool such as a puncher for punching a hole of an arbitrary size in a workpiece of a plate material such as stainless steel.
- a hydraulically driven tool such as a puncher for punching a hole of an arbitrary size in a workpiece of a plate material such as stainless steel.
- the double-acting, auto-return type puncher has a configuration as schematically shown in FIG.
- a punch 32 is connected to the lower end of the ram 31, and an upper limit switch 33 and a lower limit switch 34 are connected to the upper portion of the ram 31.
- the hydraulic pump 36 sends the oil pressure into the cylinder 35 via a switching valve (solenoid valve) 37.
- the control unit 41 receives instructions from the start (down) switch 42, the up switch 43, and the detection signals from the upper and lower limit switches 33, 34, etc.
- the operation of the hydraulic pump 36 and the switching valve 37 is controlled.
- the upper limit switch 33 and the lower limit switch 34 are in a state of being pressed by the ram 31 and their contacts are both It is closed.
- the start switch 42 is pressed, the oil is fed into the upper chamber 35 of the cylinder 35, and the oil in the lower chamber 35b is discharged. Therefore, the ram 31 descends.
- Ram 3 1 starts descent And the contacts of the upper limit switch 33 open immediately.
- the contact of the lower limit switch 34 opens, and it is detected that the ram 31 has come to the lowermost position.
- the control unit 41 switches the switching valve 37 to send oil to the lower chamber 35b of the cylinder 35 and to send oil to the upper chamber 35a. Discharge. As a result, the ram 31 automatically rises. When ram 31 begins to ascend, the contacts of the lower limit switch 34 close. When the ram 31 comes to the uppermost position, the contact of the upper limit switch 33 closes, and the controller 41 detects that the ram 31 has reached the upper limit ⁇ g. Then, the operation of the hydraulic pump 36 is stopped. In the following way, no. The car will auto-return.
- the start switch 42 will be restarted after the ram 31 1 force s one reciprocation, or if the ram 31 is at a height other than the upper limit position. There was a problem that the ram 31 was activated when pressed.
- the switching valve 37 includes first and second solenoids 37a and 37b, and a stainless steel push rod 37c, for example. , 37d and a switching valve section 37e.
- the switching valve section 37e is provided with a spool 37f that moves left and right in the cylindrical oil passage according to the state of excitation of the first and second solenoids 37a and 37b. ing.
- one solenoid 37a or 37b
- the other solenoid 37b or Or the operation of exciting 37 a was performed instantaneously.
- the left and right push rods 37c and 37d momentarily push the spool 37f together due to the residual magnetism of the solenoid on the demagnetizing side, and the push rod 37
- c or 37 d may be deformed.
- the life of the switching valve 37 was significantly reduced.
- the contact point of the lower limit switch 34 is closed when the ram 31 is lowered and drilled, and is opened only when the drilling is completed and the ram 31 reaches the lower limit.
- a hard material such as a stainless steel plate is drilled, a large impact is generated at the time of drilling, and this impact may chatter the contacts of the lower limit switch 34 and cause malfunction. was there.
- the contact of the lower limit switch 34 may be disconnected. Disclosure of the invention
- the present invention provides a control device for a hydraulically driven tool that moves a ram housed in a cylinder chamber up and down using hydraulic pressure, comprising: starting switch means for activating the lowering of the ram.
- An on-operation detection signal output means for outputting an on-operation detection signal each time the activation switch means is turned on; and an on-operation detection signal output from the on-operation detection signal output means.
- the first feature is that a switching valve control means for switching the direction of the hydraulic pressure acting on the ram to the descending direction is provided.
- the present invention provides a lower limit position detecting means for detecting a lower limit position of a ram, and a switching valve for switching a direction of a hydraulic pressure acting on the ram from a descending direction to an increasing direction based on a detection signal from the lower limit position detecting means.
- Control means, and the switching valve control A second feature is that the control means includes means for providing a predetermined rest period during a transition from a descent to a rise of the control means.
- the present invention provides: a lower limit position detecting means for detecting a lower limit position of the ram; and, based on a detection signal output from the lower limit position detecting means, a direction of a hydraulic pressure applied to the ram is changed from a descending direction to a rising direction.
- a third aspect is provided with switching valve control means for switching, and means for absorbing the chattering of the lower limit position detecting means caused by the vibration of the ram and preventing malfunction of the switching valve control means due to the chattering.
- the activation switch means outputs one ON operation detection signal only when the ON switch is operated, and outputs a new ON operation detection signal even when the ON state is continued. Since it is not performed, it does not restart even if an erroneous operation such as keeping the start switch means pressed is performed.
- a predetermined pause period is provided while the switching valve is switched from descending to ascending, it is provided in the switching valve control means during the pause period.
- the solenoid is demagnetized, and the push rod of the solenoid does not press the switching valve from both left and right directions. As a result, the deformation of the push rod can be prevented, and the life of the switching valve mechanism can be prolonged.
- the chattering is absorbed. Therefore, it is possible to prevent the malfunction of the switching valve control means, and prevent the ram from starting to rise before reaching the sufficient lower limit position.
- FIG. 1 is a circuit diagram showing a configuration of one embodiment of the present invention.
- Fig. 2 is a timing chart of the signal in the main part of Fig. 1.
- Fig. 3 is for valve switching
- FIG. 3 is a circuit diagram showing an example of a solenoid and a motor drive circuit.
- FIG. 4 is a circuit diagram showing one configuration of the self-holding circuit.
- FIG. 5 is a timing chart showing the operation when the ascending SW is turned on while the ram is descending.
- FIG. 6 is a timing chart showing the operation when an abnormality occurs.
- FIG. 7 is a block diagram showing a schematic configuration of a conventional hydraulic drive tool control device.
- FIG. 8 is a diagram showing a schematic configuration of a hydraulic switching valve mechanism.
- FIG. 1 is a circuit diagram showing a configuration of a hydraulic drive tool control device according to one embodiment of the present invention.
- the configuration of the mechanical parts such as the ram, the punch, the upper / lower limit switch and the like of the hydraulic drive tool are the same as in FIG.
- an automatic / manual switching switch 1 that switches the operation of the hydraulic drive tool between automatic and manual
- an upper limit switch 2 hereinafter abbreviated as upper limit LS 2
- Starting (or descending) switch 3 hereinafter abbreviated as starting SW 3
- lower limit switch 4 hereinafter abbreviated as LS4
- ascending switch 5 hereinafter abbreviating SW 5.
- a power supply voltage for example, 5 V
- Automatic ⁇ Manual changeover switch 1 is connected to the automatic side when the hydraulic drive tool is operated dynamically.
- the upper limit LS2 is closed only when the ram is in the upper position and open when the ram is in another position.
- Startup SW 3 is normally open, and closes only when pressed during startup.
- Lower limit The S4 contact is open only when the ram is in the lower limit position and closed when in other positions.
- the ascending SW 5 is usually located at the position indicated by the solid line in the figure. When pushed to raise the ram, it only moves to the dotted line position 5a during that time.
- FIG. 2 is a timing chart of the signal in the main part of Fig. 1.
- the start SW 3 outputs a pulse signal b as shown in FIG. 2 and the one-shot multi-circuit 15 To enter.
- the one-shot multi-circuit 15 is triggered by the pulse and outputs a pulse having a predetermined pulse width as a signal c.
- the signal c is input to the self-holding circuit 16, whereby the output of the self-holding circuit 16 is held at the H level.
- the self-holding circuit 16 outputs an H level signal d until a reset (signal is input.
- a specific example of the self-holding circuit 16 will be described later with reference to FIG.
- the workpiece is pierced as the ram descends, and at time t 2
- the contact of the lower limit LS4 opens.
- the signal e changes to L level. Therefore, the one-shot multi-circuit 18 is triggered to output a pulse signal f of a predetermined width, and this signal f is input to one input terminal of the NOR circuit 20. Since the L-level signal e is input to the other terminal of the NOR circuit 20, when the output signal f of the one-shot multi-circuit 18 falls, the output g of the NOR circuit 20 becomes H level .
- the self-holding circuit 21 is activated when the output g becomes H level, and outputs an H-level output h.
- This output h resets the self-holding circuit 16 and inputs the same to the delay circuit 22 and is delayed by T 1.
- the signal 1 output from the delay circuit 22 is input to the AND circuit 12. Since the other signal of the AND circuit 12 is at the H level as described above, the signal i is applied to the base of the transistor 23 to turn on the transistor 23. As a result, the ascending relay R 2 is turned on, and the switching valve is switched in a direction to raise the ram. When the ram moves upward, the contact of the lower limit L S4 is closed, and the output e thereof becomes H level as shown in the figure. In conjunction with this, the output g of the NOR circuit 20 turns to L level.
- the delay circuit 19 has a delay time T2 longer than the time (t2 to t3) during which the contact of the lower limit LS4 is open. For this reason, the output k of the AND circuit 24 is always at the L level, and does not affect the self-holding circuits 16 and 21.
- the lowering relay R1 and the uppering relay R 2 and the relationship between the first and second solenoids 37a and 37b described in FIG. 8 and the driving operation of the hydraulic pump will be described.
- the first solenoid 37a and the motor relay 38 in FIG. 3 are turned on.
- the switching valve is pushed by the push rod and moves in a direction to lower the ram.
- the motor relay 38 is turned on, power is supplied to the motor 39, and the motor 39 is driven.
- the ascending relay R2 is energized
- the second solenoid 37b and the motor relay 38 are turned on.
- the switching valve is pushed by the push rod, and switches in a direction to raise the ram. Further, power is supplied to the motor 39, and the motor 39 is driven.
- the self-holding circuit 16 includes an OR circuit 16a, a NAND circuit 16b, a NOR circuit 16c, a capacitor 16d, 16e, a resistor 16f, and a switch connected as shown.
- the switch means consists of 16 g and 16 h. When the reset signal is input, the switch means 16 g and 16 h select 0 volt and VI volt respectively.
- the output of the OR circuit 16a becomes H
- the output of the NAND circuit 16b becomes
- the output of the NOR circuit 16c becomes H
- the capacitor 16 e is charged. Therefore, the signal level of the other input terminal of the NOR circuit 16a becomes H, and the output of the NOR circuit 16c is maintained at H level even if the signal c subsequently becomes L level.
- the switch means 16 g selects 0 volt. Therefore, the output of the NAND circuit 16b becomes H, the output of the NOR circuit 16c becomes L, and the self-holding circuit 16 is reset.
- the switch The switch means 16 h selects VI volts. As a result, the output of the NOR circuit 16c becomes L, and the self-holding circuit 16 is reset.
- the ram descends to pierce the workpiece, and then automatically rises. Stop at the upper limit position. At this time, even if the start switch 3 is kept pressed, the ram does not restart after returning to the upper limit position.
- the one-shot multi-circuit 15 is connected to the start switch 3, and the one-shot multi-circuit 15 is triggered only by the rising signal when the start switch 3 is turned on. This is because, even if the start switch 3 is continuously turned on, it is not triggered again.
- the delay circuit 22 since the delay circuit 22 is provided, even if the ram comes to the lower limit position and the lower limit LS4 opens, the ascending relay R2 is not immediately energized. In other words, from the time the ram reaches the lower limit position and the descending relay R1 is turned off until the ascending relay R2 is energized, the time T1 when both relays are off is T1. Exists. Therefore, the first solenoid 37a in FIG. 3 demagnetizes the residual magnetism during this time T1, and the push rods do not press each other and are not deformed.
- FIG. 5 the operation of the apparatus shown in FIG. 1 when the ascending SW5 is pushed during the descent of the ram to reach the dotted line position 5a in the figure will be described with reference to FIG. In FIG. 5, the operation from time t1 when the activation SW3 is turned on to time t5 when the ascending SW5 is pressed for some reason is the same as in FIG.
- the on-operation detection signal output means outputs the on-operation detection signal each time the activation switch means is turned on, but the on state is maintained. Since the ON operation detection signal is not output even if the operation is performed, the hydraulically driven tool will not be restarted even if an erroneous operation of keeping the start switch means ON is performed.
- a predetermined pause period is provided when the switching valve is switched from descending to ascending, so that the switching valve control means performs itself during the pause period.
- Excitation of the solenoid can be demagnetized. Because of this, the remnant magnetism and the excitation of the left and right solenoids are present at the same time, so that the push ports do not push each other, and the failure of the switching valve mechanism is prevented beforehand. Will be able to
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69733303T DE69733303T2 (de) | 1996-05-31 | 1997-03-18 | Steuerungseinrichtung füt einhydraulisch angetriebenes werkzeug |
EP97908494A EP0849070B1 (en) | 1996-05-31 | 1997-03-18 | Control device for hydraulically driven tool |
AU20427/97A AU708164B2 (en) | 1996-05-31 | 1997-03-18 | Hydraulic driven tool controlling apparatus |
US08/983,235 US5992536A (en) | 1996-05-31 | 1997-03-18 | Hydraulic drive tool controlling apparatus |
KR1019970706967A KR100241865B1 (ko) | 1996-05-31 | 1997-03-18 | 유압구동공구 제어장치 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15912096A JP3295596B2 (ja) | 1996-05-31 | 1996-05-31 | 油圧駆動工具制御装置 |
JP8/159120 | 1996-05-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997045252A1 true WO1997045252A1 (fr) | 1997-12-04 |
Family
ID=15686682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/000879 WO1997045252A1 (fr) | 1996-05-31 | 1997-03-18 | Dispositif de commande pour outil a commande hydraulique |
Country Status (9)
Country | Link |
---|---|
US (3) | US5992536A (ja) |
EP (1) | EP0849070B1 (ja) |
JP (1) | JP3295596B2 (ja) |
KR (1) | KR100241865B1 (ja) |
AU (1) | AU708164B2 (ja) |
DE (1) | DE69733303T2 (ja) |
MY (2) | MY121671A (ja) |
TW (1) | TW343940B (ja) |
WO (1) | WO1997045252A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113803310A (zh) * | 2021-09-10 | 2021-12-17 | 武汉船用机械有限责任公司 | 一种双液压缸同步控制系统及其控制方法 |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7416033B2 (en) * | 2003-07-08 | 2008-08-26 | J.H. Fletcher & Co. | Instrumented drill head, related drilling/bolting machines, and methods |
US7842725B2 (en) | 2008-07-24 | 2010-11-30 | Ecolab USA, Inc. | Foaming alcohol compositions with selected dimethicone surfactants |
JP5458825B2 (ja) * | 2009-07-10 | 2014-04-02 | 富士通株式会社 | 電圧レギュレータ回路 |
JP5604952B2 (ja) | 2010-04-15 | 2014-10-15 | トヨタ紡織株式会社 | パンチプレス装置 |
US9163619B2 (en) * | 2010-09-17 | 2015-10-20 | Safoco, Inc. | Valve actuator control system and method of use |
US9439841B2 (en) | 2013-06-06 | 2016-09-13 | Ecolab Usa Inc. | Alcohol based sanitizer with improved dermal compatibility and feel |
IT201600124520A1 (it) * | 2016-12-09 | 2018-06-09 | Cembre Spa | Sistema per il taglio di cavi elettrici |
EP3333994B1 (en) * | 2016-12-09 | 2020-03-18 | CEMBRE S.p.A. | Working head for a compression or cutting tool |
CN106671189B (zh) * | 2017-03-09 | 2018-04-10 | 青岛科技大学 | 一种新型不定距打孔装置 |
JP7178591B2 (ja) * | 2019-11-15 | 2022-11-28 | パナソニックIpマネジメント株式会社 | インパクト工具、インパクト工具の制御方法及びプログラム |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5923920B2 (ja) * | 1975-04-10 | 1984-06-05 | ユケンコウギヨウ カブシキガイシヤ | 粉末原料等の加圧成形プレス制御装置 |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2283431A (en) * | 1941-02-10 | 1942-05-19 | Farrel Birmingham Co Inc | Hydraulic clutch control system |
US2375946A (en) * | 1942-07-08 | 1945-05-15 | Western Electric Co | Control system |
US3469487A (en) * | 1967-10-04 | 1969-09-30 | Whitney Corp W | Press with fluid-operated actuator |
JPS495357Y1 (ja) * | 1970-07-20 | 1974-02-07 | ||
JPS5637867Y2 (ja) * | 1973-08-04 | 1981-09-04 | ||
US4131164A (en) * | 1977-11-23 | 1978-12-26 | Chambersburg Engineering Company | Adaptive valve control system for an impact device |
US4530645A (en) * | 1979-09-21 | 1985-07-23 | Hydraunit Venture | Oil well pumping apparatus |
US4348943A (en) * | 1980-04-28 | 1982-09-14 | Hydroacoustics Inc. | Hydraulic press apparatus |
DE3406570A1 (de) * | 1984-02-23 | 1985-09-12 | Mannesmann Rexroth GmbH, 8770 Lohr | Elektromagnet/ventil-anordnung |
US4611632A (en) * | 1985-05-06 | 1986-09-16 | Imperial Clevite Inc. | Hydraulic solenoid valve structure |
DD244947B1 (de) * | 1985-12-23 | 1988-06-29 | Werkzeugmaschinenfabrik Zeulen | Verfahren zur ueberwachung des stoesselnachlaufes fuer hydraulische pressen |
US5170358A (en) * | 1990-12-06 | 1992-12-08 | Manufacturing Laboratories, Inc. | Method of controlling chatter in a machine tool |
KR950004586B1 (ko) * | 1991-10-07 | 1995-05-02 | 대한주택공사 | 파일항타 자동 측정시스템 및 그 측정방법 |
JP3188507B2 (ja) * | 1992-01-23 | 2001-07-16 | 株式会社マキタ | 締付工具 |
JP3123307B2 (ja) * | 1993-06-22 | 2001-01-09 | 富士電機株式会社 | カルマン渦流量計 |
US5474138A (en) * | 1993-12-08 | 1995-12-12 | J & M Hydraulics, Inc. | Hydraulic control circuit for pile driver |
US5598871A (en) * | 1994-04-05 | 1997-02-04 | Sturman Industries | Static and dynamic pressure balance double flow three-way control valve |
JP3220637B2 (ja) * | 1996-03-21 | 2001-10-22 | 日興電機工業株式会社 | 油圧パワーユニット装置 |
-
1996
- 1996-05-31 JP JP15912096A patent/JP3295596B2/ja not_active Expired - Fee Related
-
1997
- 1997-02-04 TW TW086101305A patent/TW343940B/zh not_active IP Right Cessation
- 1997-03-18 DE DE69733303T patent/DE69733303T2/de not_active Expired - Lifetime
- 1997-03-18 KR KR1019970706967A patent/KR100241865B1/ko active IP Right Grant
- 1997-03-18 US US08/983,235 patent/US5992536A/en not_active Expired - Lifetime
- 1997-03-18 AU AU20427/97A patent/AU708164B2/en not_active Expired
- 1997-03-18 EP EP97908494A patent/EP0849070B1/en not_active Expired - Lifetime
- 1997-03-18 WO PCT/JP1997/000879 patent/WO1997045252A1/ja active IP Right Grant
- 1997-05-29 MY MYPI97002360A patent/MY121671A/en unknown
- 1997-05-29 MY MYPI20043410A patent/MY127381A/en unknown
-
1999
- 1999-06-16 US US09/334,155 patent/US6109161A/en not_active Expired - Lifetime
- 1999-06-16 US US09/333,557 patent/US6053258A/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5923920B2 (ja) * | 1975-04-10 | 1984-06-05 | ユケンコウギヨウ カブシキガイシヤ | 粉末原料等の加圧成形プレス制御装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113803310A (zh) * | 2021-09-10 | 2021-12-17 | 武汉船用机械有限责任公司 | 一种双液压缸同步控制系统及其控制方法 |
CN113803310B (zh) * | 2021-09-10 | 2023-07-21 | 武汉船用机械有限责任公司 | 一种双液压缸同步控制系统及其控制方法 |
Also Published As
Publication number | Publication date |
---|---|
US6109161A (en) | 2000-08-29 |
US6053258A (en) | 2000-04-25 |
DE69733303T2 (de) | 2005-11-17 |
EP0849070A4 (en) | 2001-11-28 |
DE69733303D1 (de) | 2005-06-23 |
MY121671A (en) | 2006-02-28 |
KR100241865B1 (ko) | 2000-03-02 |
EP0849070A1 (en) | 1998-06-24 |
US5992536A (en) | 1999-11-30 |
KR19980703563A (ko) | 1998-11-05 |
JP3295596B2 (ja) | 2002-06-24 |
EP0849070B1 (en) | 2005-05-18 |
TW343940B (en) | 1998-11-01 |
JPH09323199A (ja) | 1997-12-16 |
MY127381A (en) | 2006-11-30 |
AU708164B2 (en) | 1999-07-29 |
AU2042797A (en) | 1998-01-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO1997045252A1 (fr) | Dispositif de commande pour outil a commande hydraulique | |
WO1999013482A1 (fr) | Unite de commande pour relais | |
WO1996019341A1 (fr) | Dispositif de protection de la matrice pour presses hydrauliques | |
US5119717A (en) | Method of controlling solenoid valves for a hydraulic actuator, with a time delay between closing a normally open valve and opening a normally closed valve | |
US2589849A (en) | Punching machine | |
JP2003028105A (ja) | 低エネルギー/熱移動外皮破壊システム | |
US20070169618A1 (en) | Hydraulic drive | |
JP4744205B2 (ja) | コンクリートポンプの閉塞防止装置 | |
AU726677B2 (en) | Control device for hydraulically driven tool | |
US4298114A (en) | Control circuit for a press | |
AU2121299A (en) | Control device for hydraulically driven tool | |
KR20080074096A (ko) | 유압 서보 조향 장치 및 펌프 구동 모터의 제어 방법 | |
KR20220116960A (ko) | 공압 구동식 도어의 공압 제어장치 및 공압 제어방법 | |
JP3993933B2 (ja) | 工作機械用ツールの交換装置 | |
US5108265A (en) | Temperature-dependent pressure switch and pressure control system using the switch | |
JP4556627B2 (ja) | 産業車両の油圧制御装置及び産業車両 | |
JP2004333142A (ja) | 衝撃試験機 | |
JPH08300433A (ja) | 射出成形機における油圧機構の制御装置 | |
KR19980066184U (ko) | 프레스의 클러치 및 브레이크 구동장치 | |
JPH10122201A (ja) | 油圧装置 | |
JPH11270462A (ja) | ポンプ作動システム及び方法 | |
JPH0355361B2 (ja) | ||
JP2008048511A (ja) | 電動機 | |
JPH1026102A (ja) | 電気式ダンプ制御装置 | |
JP3187196B2 (ja) | アクチュエータ制御装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 1997908494 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1019970706967 Country of ref document: KR |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AU KR SG US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 08983235 Country of ref document: US |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 1997908494 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1019970706967 Country of ref document: KR |
|
WWG | Wipo information: grant in national office |
Ref document number: 1019970706967 Country of ref document: KR |
|
WWG | Wipo information: grant in national office |
Ref document number: 1997908494 Country of ref document: EP |