DE19631804A1 - Hydraulic hoist with lifting cylinder driven by constant output pump - Google Patents
Hydraulic hoist with lifting cylinder driven by constant output pumpInfo
- Publication number
- DE19631804A1 DE19631804A1 DE19631804A DE19631804A DE19631804A1 DE 19631804 A1 DE19631804 A1 DE 19631804A1 DE 19631804 A DE19631804 A DE 19631804A DE 19631804 A DE19631804 A DE 19631804A DE 19631804 A1 DE19631804 A1 DE 19631804A1
- Authority
- DE
- Germany
- Prior art keywords
- lifting device
- speed
- pump
- hydraulic lifting
- constant 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.)
- Granted
Links
Classifications
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
- F15B11/0423—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling pump output or bypass, other than to maintain constant speed
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20538—Type of pump constant capacity
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20569—Type of pump capable of working as pump and motor
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41563—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a return line
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/46—Control of flow in the return line, i.e. meter-out control
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6651—Control of the prime mover, e.g. control of the output torque or rotational speed
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7052—Single-acting output members
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Die Erfindung betrifft eine hydraulische Hubeinrichtung, deren Hubzylinder die Arbeitsflüssigkeit von einer Konstantpumpe als Druckmittelquelle zugeführt bekommt. Die Konstantpumpe wird von einem drehzahlregelbaren Elektromotor angetrieben entsprechend der japanischen Offenlegungsschrift 5-186146 (A). Bei kleinen Hubgeschwindigkeiten mit entsprechend kleinen Pumpendrehzahlen ergibt sich bei Verwendung von Kolbenpumpen als Druckmittelquel le infolge auftretender Druckpulsation eine ungleichförmige Hub bewegung und mangelnde Schmierung der Kolben und Steuerflächen der Kolbenpumpe.The invention relates to a hydraulic lifting device, the Lift cylinder the working fluid from a constant pump as Pressure medium source is supplied. The constant pump is from a variable speed electric motor driven accordingly Japanese Laid-Open Publication 5-186146 (A). With small ones Stroke speeds with correspondingly low pump speeds results when using piston pumps as a pressure medium source le a non-uniform stroke due to pressure pulsation movement and insufficient lubrication of the pistons and control surfaces the piston pump.
Die Aufgabe der Erfindung besteht darin, die vorbezeichneten Mängel bei Verwendung von Konstantpumpen in Kolbenbauart als Druckmittelquelle für Hubeinrichtungen weitgehend zu unterbin den. Dies wird mit den kennzeichnenden Merkmalen des Anspruches 1 erzielt. Dadurch, daß ein Teil der von der Konstantpumpe ge lieferten Arbeitsflüssigkeitsmenge bei kleinen Pumpendrehzahlen zum Tank zurückführbar ist, muß auch bei kleinen Hubgeschwindig keiten des Hubzylinders die Pumpe mit einer höheren Drehzahl be trieben werden, die ausreicht, die vorgenannten Mängel weitge hend zu unterbinden.The object of the invention is that of the aforementioned Defects when using constant displacement pumps as piston To largely prevent pressure medium source for lifting devices the. This is with the characterizing features of the claim 1 scored. The fact that part of the ge of the constant pump delivered working fluid quantity at low pump speeds can be returned to the tank, even at small lifting speeds of the lifting cylinder, the pump runs at a higher speed are driven, which suffices, the aforementioned deficiencies to prevent.
Ein weiterer Vorteil der Erfindung ergibt sich dadurch, daß der die Pumpe antreibende Elektromotor nicht unter Last angefahren und damit ein unverhältnismäßig hoher Strom aus dem Netz gezogen werden muß.Another advantage of the invention results from the fact that the the electric motor driving the pump is not started under load and thus a disproportionately high amount of electricity is drawn from the grid must become.
Durch die japanische Offenlegungsschrift 6-183668 (A) vom 5.7.94 ist eine hydraulische Hubvorrichtung bekanntgeworden, an deren Druckleitung eine Bypass-Leitung angeschlossen ist, die über ein Schaltventil zum Tank führt. Diese Bypass-Leitung dient dazu, bei Inbetriebnahme der Anlage die zunächst noch zu kalte Ar beitsflüssigkeit solange unmittelbar zum Tank zurückzuführen, bis diese die vorgeschriebene Betriebstemperatur erreicht hat. Danach wird das betreffende Ventil geschlossen und der Hubbe trieb der Anlage aufgenommen.Japanese Patent Application 6-183668 (A) dated 5.7.94 has become known a hydraulic lifting device, at the A bypass line is connected via a pressure line Switch valve leads to the tank. This bypass line is used to when commissioning the system, the initially too cold ar as long as the liquid is returned directly to the tank, until it has reached the prescribed operating temperature. Then the valve in question is closed and the stroke drive the system added.
Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen sowie der nachfolgenden Figurenbeschreibung ei nes Ausführungsbeispiels.Advantageous developments of the invention result from the Subclaims and the following figure description ei Nes embodiment.
Fig. 1 der Zeichnung veranschaulicht den schematischen Aufbau einer erfindungsgemäßen hydraulischen Hubeinrichtung und Fig. 1 of the drawing illustrates the schematic structure of a hydraulic lifting device and
Fig. 2 die Abhängigkeit der zum Tank zurückströmenden Teilmenge der Fördermenge der Pumpe in Abhängigkeit deren Drehzahl. Fig. 2 shows the dependency of the partial flow back to the tank of the delivery rate of the pump as a function of its speed.
In Fig. 1 ist mit 1 eine Konstantpumpe bezeichnet, die von ei ner Asynchronmaschine 2 angetrieben wird. Die Drehzahländerung der Asynchronmaschine erfolgt über einen Frequenzumrichter 3, der eingangsseitig mit einem Drehstromnetz 4 verbunden ist. Der Frequenzumrichter 3 wird von einer elektronischen Steuerung 5 angesteuert, die die Drehzahl der Asynchronmaschine und damit die Drehzahl der Konstantpumpe 1 bestimmt. Die Druckleitung 6 der Konstantpumpe führt über ein 2-Wegeventil 7 mit den Endstel lungen a und b zum als Plungerzylinder ausgebildeten Hubzylinder 8. Zwischen Konstantpumpe 1 und 2-Wegeventil 7 führt von der Druckleitung 6 eine Bypass-Leitung 9 über eine Verstelldrossel 10 mit Verstelleinrichtung 11 zurück zum Tank T. Die Verstel leinrichtung 11 der Verstelldrossel 10 wird von der gleichen Steuerung 5 angesteuert wie der Frequenzumrichter 3 zur Festle gung der Drehzahl n der die Konstantpumpe 1 antreibenden Asyn chronmaschine 2. Bei Stillstand der Konstantpumpe 1, also bei Drehzahl n = null, weist entsprechend Fig. 2 die Verstelldros sel 10 ihren größten Durchflußquerschnitt A auf. Bei Inbetrieb nahme der Konstantpumpe strömt deshalb zunächst der gesamte noch geringe Förderstrom der Konstantpumpe über die Bypass-Leitung 9 mit voll geöffneter Verstelldrossel 10 drucklos zurück zum Tank T. Das in der Druckleitung 6 angeordnete 2-Wegeventil 7 befindet sich beim Stillstand der Pumpe in der einen Endstellung a, in der sich die vom Hubzylinder 8 getragene Last L über die im Ar beitsraum 8a des Hubzylinders sowie im Druckleitungsabschnitt 6a befindliche Arbeitsflüssigkeit auf den Rückschlagventilkörper 7a abstützt. Mit zunehmender Drehzahl der Konstantpumpe 1 und damit größer werdenden Fördermenge wird der Durchflußquerschnitt A der Verstelldrossel 10 verkleinert, so daß sich ein überproportiona ler Anstieg des Pumpendruckes einstellt. Sobald dieser Pumpen druck den im Hubzylinder 8 wirkenden Lastdruck übersteigt, strömt Arbeitsflüssigkeit über den sich öffnenden Rückschlagkör per 7a des 2-Wegeventils 7 zum Arbeitsraum 8a des Hubzylinders 8 und verschiebt den die Last tragenden Plunger 12 nach außen bzw. nach oben, wobei eine Teilmenge der Fördermenge der Konstantpum pe entsprechend dem aktuellen Durchflußquerschnitt der Ver stelldrossel 10 und dem Pumpendruck über die Bypass-Leitung 9 zurück zum Tank strömt. Mit weiter ansteigender Drehzahl der Pumpe und damit steigender Hubgeschwindigkeit des Plungers 12 des Hubzylinders 8 wird der Durchflußquerschnitt der Ver stelldrossel 10 weiter verkleinert, bis er schließlich ab einer durch die Steuerung 5 festgelegten Drehzahl n der Konstantpumpe ganz geschlossen wird (Fig. 2), so daß ab diesem Zeitpunkt die gesamte Fördermenge der Konstantpumpe zur Bewegungsumsetzung durch den Plunger 12 des Hubzylinders 8 zur Verfügung steht.In Fig. 1, 1 denotes a constant pump which is driven by egg ner asynchronous machine 2 . The speed change of the asynchronous machine takes place via a frequency converter 3 , which is connected on the input side to a three-phase network 4 . The frequency converter 3 is controlled by an electronic control 5 , which determines the speed of the asynchronous machine and thus the speed of the constant pump 1 . The pressure line 6 of the constant pump leads via a 2-way valve 7 with the end positions a and b to the lifting cylinder designed as a plunger cylinder 8 . Between constant pump 1 and 2-way valve 7 leads from the pressure line 6 a bypass line 9 via an adjusting throttle 10 with adjusting device 11 back to the tank T. The adjusting device 11 of the adjusting throttle 10 is controlled by the same controller 5 as the frequency converter 3 to the Festle supply the rotational speed of the fixed displacement pump 1 driving Asyn n chronmaschine. 2 When the constant pump 1 is at a standstill, that is to say at a speed n = zero, the selector throttle sel 10 has its largest flow cross-section A according to FIG . When putting the constant pump into operation, the entire still low flow rate of the constant pump flows via the bypass line 9 with the fully open adjusting throttle 10 back to the tank T. The 2-way valve 7 arranged in the pressure line 6 is in the position when the pump is at a standstill an end position a, in which the load L borne by the lifting cylinder 8 is supported on the check valve body 7 a by the working fluid located in the working space 8 a of the lifting cylinder and in the pressure line section 6 a. With increasing speed of the constant pump 1 and thus increasing flow rate, the flow cross section A of the adjusting throttle 10 is reduced, so that a disproportionate increase in the pump pressure occurs. As soon as this pump pressure exceeds the load pressure acting in the lifting cylinder 8 , working fluid flows over the opening Rückschlagkör by 7 a of the 2-way valve 7 to the working chamber 8 a of the lifting cylinder 8 and moves the load-bearing plunger 12 to the outside or up, whereby a subset of the delivery rate of the constant pump pe flows according to the current flow cross section of the adjusting throttle 10 and the pump pressure via the bypass line 9 back to the tank. With further increasing speed of the pump and thus increasing stroke speed of the plunger 12 of the lifting cylinder 8 , the flow cross section of the adjusting throttle 10 is further reduced until it is finally closed completely from a speed n of the constant pump determined by the controller 5 ( FIG. 2), so that from this point in time the entire delivery rate of the constant pump is available for motion conversion by the plunger 12 of the lifting cylinder 8 .
Der maximale Durchflußquerschnitt der Verstelldrossel 10 wird so groß gewählt, daß bei langsamer Hubgeschwindigkeit des Plungers über die Bypass-Leitung eine so große Teilmenge des Förderstro mes der Pumpe strömen kann, daß letztere für den zum Anheben der Last erforderlichen Druck mit einer Drehzahl betrieben werden muß, die eine ausreichende Schmierung der betreffenden Pumpen teile gewährleistet und die Frequenz der Druckpulsation der Pum pe die Hubbewegung des Plungers 12 nicht mehr nachteilig beein trächtigt.The maximum flow cross section of the adjusting throttle 10 is chosen so large that at a slow stroke speed of the plunger via the bypass line, such a large part of the delivery flow meter of the pump can flow that the latter must be operated at a speed for the pressure required to raise the load which ensures sufficient lubrication of the pump in question and the frequency of the pressure pulsation of the pump pe no longer adversely affects the stroke movement of the plunger 12 .
Die vorbeschriebene Hubeinrichtung wird vorteilhafterweise als Antrieb für einen Aufzug eingesetzt.The lifting device described above is advantageously used as Drive used for an elevator.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19631804A DE19631804B4 (en) | 1996-07-10 | 1996-08-07 | Hydraulic lifting device |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19627710 | 1996-07-10 | ||
DE19627710.8 | 1996-07-10 | ||
DE19631804A DE19631804B4 (en) | 1996-07-10 | 1996-08-07 | Hydraulic lifting device |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19631804A1 true DE19631804A1 (en) | 1998-01-15 |
DE19631804B4 DE19631804B4 (en) | 2010-02-25 |
Family
ID=7799388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19631804A Expired - Lifetime DE19631804B4 (en) | 1996-07-10 | 1996-08-07 | Hydraulic lifting device |
Country Status (1)
Country | Link |
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DE (1) | DE19631804B4 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0990802A2 (en) | 1998-09-30 | 2000-04-05 | Robert Bosch Gmbh | Electrohydraulic speed control device for an hydraulic lifting cylinder |
CN1079073C (en) * | 1998-06-08 | 2002-02-13 | 液压驱动工业株式会社 | Method of controlling energy-efficient hydraulic lifting system |
US6769894B2 (en) | 2000-10-13 | 2004-08-03 | Engel Maschinenbau Gesellschaft M.B.H. | Apparatus for the injection molding of plastic material |
WO2005057020A1 (en) * | 2003-12-15 | 2005-06-23 | Plugging Specialists International Asa | Control system for hydraulic cylinder, plug with a hydraulic cylinder and methods for setting and releasing a plug |
CN102042273A (en) * | 2010-08-13 | 2011-05-04 | 长沙中联重工科技发展股份有限公司 | Hydraulic control loop and method |
EP3127855A1 (en) * | 2015-08-06 | 2017-02-08 | Sherpa Autodiagnostik GmbH | Drive for an electrohydraulically operated lifting device, in particular lifting platform |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2625568A (en) * | 2022-12-20 | 2024-06-26 | Hyva Holding Bv | A hydraulic cylinder assembly |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD48009A (en) * | ||||
DE1909405U (en) * | 1964-10-23 | 1965-02-04 | Walter Hunger | HYDRAULIC LIFTING DEVICE WITH STORAGE SYSTEM, IN PARTICULAR FOR TILTING VEHICLES. |
DE1531349B1 (en) * | 1967-09-21 | 1969-10-16 | Weber Oelhydraulik | Portable hydraulic lifting device, preferably for raising and lowering racks or the like. for loading on a truck |
DE3332468A1 (en) * | 1982-09-09 | 1984-03-15 | Arimitsu Industry Co. Ltd., Osaka | Liquid-pumping device |
DE3545019A1 (en) * | 1985-12-19 | 1987-07-02 | Voith Gmbh J M | High-pressure pump with flushing device |
DE4116152A1 (en) * | 1991-05-17 | 1992-11-19 | Bosch Gmbh Robert | DEVICE FOR ADJUSTING THE TURNING ANGLE ASSIGNMENT OF A CAMSHAFT TO YOUR DRIVE ELEMENT |
DE9314760U1 (en) * | 1993-09-30 | 1993-11-25 | Flutec Fluidtechnische Geräte GmbH, 66280 Sulzbach | Start-up circuit |
US5281774A (en) * | 1990-11-20 | 1994-01-25 | Mitsubishi Denki Kabushiki Kaisha | Drive control unit for hydraulic elevator |
DE9317216U1 (en) * | 1993-11-10 | 1994-02-10 | Pharmol Farben u. Lacke GmbH, 89423 Gundelfingen | Barrel pump |
JPH06286986A (en) * | 1993-03-31 | 1994-10-11 | Koretsuku Kk | Hydraulic jack |
DE4411567C2 (en) * | 1994-04-02 | 1996-10-31 | Kaercher Gmbh & Co Alfred | High pressure cleaning device |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4335403C1 (en) * | 1993-10-18 | 1994-12-15 | Karl Hehl | Hydraulic device |
-
1996
- 1996-08-07 DE DE19631804A patent/DE19631804B4/en not_active Expired - Lifetime
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD48009A (en) * | ||||
DE1909405U (en) * | 1964-10-23 | 1965-02-04 | Walter Hunger | HYDRAULIC LIFTING DEVICE WITH STORAGE SYSTEM, IN PARTICULAR FOR TILTING VEHICLES. |
DE1531349B1 (en) * | 1967-09-21 | 1969-10-16 | Weber Oelhydraulik | Portable hydraulic lifting device, preferably for raising and lowering racks or the like. for loading on a truck |
DE3332468A1 (en) * | 1982-09-09 | 1984-03-15 | Arimitsu Industry Co. Ltd., Osaka | Liquid-pumping device |
DE3545019A1 (en) * | 1985-12-19 | 1987-07-02 | Voith Gmbh J M | High-pressure pump with flushing device |
US5281774A (en) * | 1990-11-20 | 1994-01-25 | Mitsubishi Denki Kabushiki Kaisha | Drive control unit for hydraulic elevator |
DE4116152A1 (en) * | 1991-05-17 | 1992-11-19 | Bosch Gmbh Robert | DEVICE FOR ADJUSTING THE TURNING ANGLE ASSIGNMENT OF A CAMSHAFT TO YOUR DRIVE ELEMENT |
JPH06286986A (en) * | 1993-03-31 | 1994-10-11 | Koretsuku Kk | Hydraulic jack |
DE9314760U1 (en) * | 1993-09-30 | 1993-11-25 | Flutec Fluidtechnische Geräte GmbH, 66280 Sulzbach | Start-up circuit |
DE9317216U1 (en) * | 1993-11-10 | 1994-02-10 | Pharmol Farben u. Lacke GmbH, 89423 Gundelfingen | Barrel pump |
DE4411567C2 (en) * | 1994-04-02 | 1996-10-31 | Kaercher Gmbh & Co Alfred | High pressure cleaning device |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1079073C (en) * | 1998-06-08 | 2002-02-13 | 液压驱动工业株式会社 | Method of controlling energy-efficient hydraulic lifting system |
EP0990802A2 (en) | 1998-09-30 | 2000-04-05 | Robert Bosch Gmbh | Electrohydraulic speed control device for an hydraulic lifting cylinder |
EP0990802A3 (en) * | 1998-09-30 | 2001-07-25 | Robert Bosch Gmbh | Electrohydraulic speed control device for an hydraulic lifting cylinder |
US6769894B2 (en) | 2000-10-13 | 2004-08-03 | Engel Maschinenbau Gesellschaft M.B.H. | Apparatus for the injection molding of plastic material |
EP1197312B1 (en) * | 2000-10-13 | 2005-08-03 | Engel Austria GmbH | Water injection method for injection moulding of plastic molded parts |
WO2005057020A1 (en) * | 2003-12-15 | 2005-06-23 | Plugging Specialists International Asa | Control system for hydraulic cylinder, plug with a hydraulic cylinder and methods for setting and releasing a plug |
CN102042273A (en) * | 2010-08-13 | 2011-05-04 | 长沙中联重工科技发展股份有限公司 | Hydraulic control loop and method |
WO2012019498A1 (en) * | 2010-08-13 | 2012-02-16 | 长沙中联重工科技发展股份有限公司 | Hydraulic control circuit and method |
EP3127855A1 (en) * | 2015-08-06 | 2017-02-08 | Sherpa Autodiagnostik GmbH | Drive for an electrohydraulically operated lifting device, in particular lifting platform |
DE102015112974A1 (en) * | 2015-08-06 | 2017-02-09 | Sherpa Autodiagnostik Gmbh | Drive for an electrohydraulic lifting device, in particular lifting platform |
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