EP0823965A1 - Elektrohydraulisches hubgerät - Google Patents
Elektrohydraulisches hubgerätInfo
- Publication number
- EP0823965A1 EP0823965A1 EP97905113A EP97905113A EP0823965A1 EP 0823965 A1 EP0823965 A1 EP 0823965A1 EP 97905113 A EP97905113 A EP 97905113A EP 97905113 A EP97905113 A EP 97905113A EP 0823965 A1 EP0823965 A1 EP 0823965A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- potentiometer
- lifting device
- piston
- piston rod
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/18—Combined units comprising both motor and pump
Definitions
- the invention relates to an electrohydraulic lifting device according to the preamble of claim 1.
- Such lifting devices are used in a variety of sizes depending on the required actuating forces in a wide variety of areas. As a rule, only one signal state is displayed, which indicates whether the piston rod is retracted or extended. However, for certain applications it is necessary to get an indication of the stroke length of the piston rod.
- the invention is therefore based on the object of designing a hoogerate of the type specified at the outset in such a way that a reliable display of the stroke length is available.
- This task ⁇ . ⁇ ⁇ rd according to the invention essentially solved by the fact that a device for displaying the stroke position of the piston rod is arranged, which continuously indicates the stroke position in the form of electrical signals, which can be removed from the outside of the housing.
- the display device is arranged within the housing of the lifting device, it is protected from external influences after such lifting devices often work under rough operating conditions.
- REPLACEMENT BLA ⁇ (RULE 26) 2 is a view of a flow control device
- Fig. 3 is a schematic representation of a display device with capacitor plates
- FIG. 4 shows a schematic illustration of a display device which works with ultrasound.
- FIG. 1 shows, in a closed housing 1, an electric motor 2 which drives a pump wheel 3 which acts on a piston 4 with a hydraulic fluid which is contained in the housing 1 in the region of the electric motor 2 and the pump.
- the free end of the piston rod 5 of the piston 4 loaded with a spring 6 protrudes from the housing 1. 7 with a connection box for the control of the electric motor 2 is designated.
- This structure of an electrohydraulic lifting device is known per se.
- the piston rod 5 is provided with an elongated bore 9 for receiving a potentiometer 8.
- a compression spring (not shown) can be arranged, which is supported on the one hand on the tubular body 10 fixed to the housing and on the other hand the free end of the rod-shaped element 11 stops at the bottom of the bore 9 in the piston rod 5.
- REPLACEMENT BLA ⁇ (RULE 26) is firmly connected so that it forms a ⁇ ephaseusefcstc: part.
- stator 25 which on the circumference following the impeller 3 has openings 26 with bevelled edges in the circumferential direction through which the hydraulic fluid is guided from the impeller 3 to the piston surface, as indicated by arrow 29.
- 30 with a radially extending groove on the stator 25 is designated, in which the lines 12 are inserted.
- the stator 25 carries a clamp 28, for example in the form of a slotted ring, on which the tubular body 10 of the potentiometer 8 is firmly clamped, so that this body 10 is also held stationary during the piston movement.
- the stationary guide wheel 25, as shown in FIG. 2, is designed such that it directs the flow of the hydraulic fluid generated by the rotating pump wheel 3 onto the piston surface and thereby calms the turbulent flow.
- the guide wheel 25 thus also has the effect of a flow guide device for effectively deflecting the flow of the hydraulic fluid from the pump wheel 3 to the piston surface.
- a magnet arrangement can also be provided, which holds the rod-shaped element 11 in contact with the bottom of the bore 9.
- the plunger head 33 can be provided with a magnet, the contact surface of the plunger head 33 preferably corresponding to that of the bottom of the bore 9.
- a form-fitting connection between the rod-shaped element 11 and the piston rod 5 can also be provided, so that the rod-shaped element 11 is moved with the piston rod 5 without play relative to the tubular body 10 of the potentiometer.
- the rod-shaped element 11 can be screwed, glued or potted to the piston rod.
- Such a connection between rod-shaped element 11 and piston rod 5 instead of the previously specified spring is particularly expedient if the lifting device has a longer stroke length of, for example, up to 160 mm.
- the potentiometer 8 can also be arranged between the piston 4 and the cylinder jacket base 13, on which the spring 6 is also supported. In this case, the potentiometer S is pushed together when the piston rod 5 is extended.
- the spring 6 acting on the piston 4 can also be omitted, for example. when a corresponding load acts on the piston rod 5, which takes over the function of the spring 6 and returns the piston to its initial position shown in FIG. 1.
- the potentiometer 8 is exposed to the pressure and the temperature of the hydraulic fluid, which can heat up to 110 ° C during operation. Furthermore, the mechanical vibrations act on the potentiometer 8, which act on the piston rod 5, but the potentiometer 8 is arranged so protected within the piston rod 5 that reliable values for the position indicator of the piston rod are delivered.
- openings 31 are provided on the tubular body 10 of the potentiometer in such a way that the hydraulic fluid contained in the housing 1 can penetrate into the potentiometer 8 and air inclusion is prevented in it, which would lead to a time delay of the measurement data. Delaying the delivery of the measurement data from the potentiometer would lead to safety risks in crane construction, for example.
- the openings 31 connecting the interior of the potentiometer 8 to the interior of the housing 1 can be formed, for example, in the form of a diametrically extending slot on the cover 32 of the potentiometer on the piston rod side. In the embodiment of FIG. 1, these connection openings 31 are made in the tubular body 10.
- REPLACEMENT BLA ⁇ (RULE 26) A seal between bumps! 'J i of Potent omete r s un ⁇ rohrformigem body 10 may also entiallen, the bore 9 in the piston rod .alpha..sub.a flooded with hydraulic fluid and a fluid communication between the interior of the potentiometer and the surrounding area is to be favored.
- a capacitive display device is designed in such a way that capacitor plates which are movable relative to one another are attached, when acted upon by an alternating voltage can attack a sine function './erden whose amplitude em measure for the position of the piston rod relative to the housing.
- Such a capacitive display device can be designed in such a way that a brass plate is attached to both the cylinder jacket 13 and the piston 4 in such a way that the brass plate is electrically insulated from the piston or the cylinder.
- a supply voltage is applied to the two brass plates.
- the capacitance is inversely proportional to the voltage, as is the distance.
- the capacitance is also directly related to the power applied.
- Fig. 3 shows a measuring bridge with the capacitor shown at 14 from the attached to the piston 4 and the cylinder, relatively movable capacitor plates. At 15 further capacitors with 4.7 pF each are shown, the variable capacitor 14 having 5 pF. 16 denotes an operational amplifier and A denotes a display element on which the voltage can be removed.
- the bridge voltage can also be 5 V and the capacities can also be designed with 20 pF.
- This display device with variable capacitor and measuring bridge is highly sensitive and results in a shockproof, wear-resistant display device that is independent of the temperature of the hydraulic oil.
- an ultrasound transmitter and receiver 17 e.g. attached in the form of a ceramic capsule, as shown schematically in FIG. 4.
- the ultrasonic transmitter 17 is directed towards the rear of the piston 4, from which the ultrasonic waves are reflected and received again by the ultrasonic transmitter 17.
- 18 designates an electrical switch which switches the ultrasonic transmitter or transmitter 17 to transmission and reception at predetermined time intervals depending on a clock generator 19. These time intervals are in the millisecond range.
- the signals obtained are detected in a logic circuit 20 as a function of the time signal obtained and the distance between the piston 4 and the cylinder jacket base 13 is determined as a function of the transit time of the ultrasonic waves.
- the logic circuit 20 and the other elements such as the electrical circuit
- Trical switches 18 can be accommodated in the switch box / 4nbgera: it.
- the logic circuit 20 can be connected to a display 21 which shows the stroke length 7.B. optically in mm.
- 23 denotes a standardization device for the setting and 24 denotes a time window in which, for example, the number of strokes per unit of time and the like can be read.
- This display device is influenced by the temperature of the hydraulic oil. It is therefore expedient to provide a temperature compensation device, indicated at 22, which is connected to the logic circuit 20.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Types And Forms Of Lifts (AREA)
- Elevator Control (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19607917 | 1996-03-01 | ||
DE19607917A DE19607917A1 (de) | 1996-03-01 | 1996-03-01 | Elektrohydraulisches Hubgerät |
PCT/EP1997/000961 WO1997032138A1 (de) | 1996-03-01 | 1997-02-27 | Elektrohydraulisches hubgerät |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0823965A1 true EP0823965A1 (de) | 1998-02-18 |
EP0823965B1 EP0823965B1 (de) | 2002-01-23 |
Family
ID=7786934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97905113A Expired - Lifetime EP0823965B1 (de) | 1996-03-01 | 1997-02-27 | Elektrohydraulisches hubgerät |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0823965B1 (de) |
DE (2) | DE19607917A1 (de) |
ES (1) | ES2170363T3 (de) |
WO (1) | WO1997032138A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012106031B3 (de) * | 2012-07-05 | 2013-07-11 | Römer Fördertechnik GmbH | Elektrohydraulisches Hubgerät sowie Verfahren zur Steuerung des elektrohydraulischen Hubgerätes |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3742713A (en) * | 1971-11-08 | 1973-07-03 | E Schweitzer | Hydraulic control actuator |
US3828556A (en) * | 1973-01-26 | 1974-08-13 | Johnson Service Co | Hydraulic actuator |
DE2929442A1 (de) * | 1979-07-20 | 1981-01-29 | Elmeg | Elektrohydraulisches stellgeraet |
GB2117828B (en) * | 1982-03-26 | 1985-08-14 | Moog Inc | Linear actuator with piston position transducer |
SE436072B (sv) * | 1983-03-22 | 1984-11-05 | Hara Ab | Potentiometeranordning for legesbestemning av hydraulkolvar och liknande |
DE3424935C1 (de) * | 1984-07-06 | 1985-10-24 | Klöckner-Becorit GmbH, 4620 Castrop-Rauxel | Druckmittelbetätigtes Schubkolbengetriebe |
DE3520199A1 (de) * | 1984-10-05 | 1986-04-10 | Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover | Potentiometer |
US4926693A (en) * | 1988-06-03 | 1990-05-22 | The Research Corporation Of The University Of Hawaii | Contactless actuator piston proximity sensor |
US5144801A (en) * | 1989-04-28 | 1992-09-08 | Parker Hannifin Corporation | Electro-hydraulic actuator system |
DE4237853C2 (de) * | 1992-11-10 | 2002-10-24 | Zf Sachs Ag | Hydraulischer Stellantrieb, insbesondere für eine Kraftfahrzeug-Reibungskupplung |
-
1996
- 1996-03-01 DE DE19607917A patent/DE19607917A1/de not_active Withdrawn
-
1997
- 1997-02-27 ES ES97905113T patent/ES2170363T3/es not_active Expired - Lifetime
- 1997-02-27 EP EP97905113A patent/EP0823965B1/de not_active Expired - Lifetime
- 1997-02-27 WO PCT/EP1997/000961 patent/WO1997032138A1/de active IP Right Grant
- 1997-02-27 DE DE59706158T patent/DE59706158D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9732138A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1997032138A1 (de) | 1997-09-04 |
EP0823965B1 (de) | 2002-01-23 |
ES2170363T3 (es) | 2002-08-01 |
DE19607917A1 (de) | 1997-09-04 |
DE59706158D1 (de) | 2002-03-14 |
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