EP3127855A1 - Entrainement de dispositif de levage electro-hydraulique, en particulier elevateur - Google Patents

Entrainement de dispositif de levage electro-hydraulique, en particulier elevateur Download PDF

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Publication number
EP3127855A1
EP3127855A1 EP16182532.8A EP16182532A EP3127855A1 EP 3127855 A1 EP3127855 A1 EP 3127855A1 EP 16182532 A EP16182532 A EP 16182532A EP 3127855 A1 EP3127855 A1 EP 3127855A1
Authority
EP
European Patent Office
Prior art keywords
electric motor
working cylinder
hydraulic pump
hydraulic
frequency converter
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
Application number
EP16182532.8A
Other languages
German (de)
English (en)
Other versions
EP3127855B1 (fr
Inventor
Manfred Rischke
Martin KOLM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sherpa Autodiagnostik GmbH
Original Assignee
Sherpa Autodiagnostik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sherpa Autodiagnostik GmbH filed Critical Sherpa Autodiagnostik GmbH
Publication of EP3127855A1 publication Critical patent/EP3127855A1/fr
Application granted granted Critical
Publication of EP3127855B1 publication Critical patent/EP3127855B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/065—Scissor linkages, i.e. X-configuration
    • B66F7/0658—Multiple scissor linkages horizontally arranged
    • 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
    • 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
    • F15B2211/60—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
    • F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/85—Control during special operating conditions
    • F15B2211/851—Control during special operating conditions during starting
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/85—Control during special operating conditions
    • F15B2211/853—Control during special operating conditions during stopping

Definitions

  • the present invention relates to a drive for an electrohydraulically driven lifting device, in particular a lift and a lift, which comprises such a drive, and a method for operating an electro-hydraulic drive for a lifting device.
  • the present invention relates to a drive for an electro-hydraulically operated scissor lift and a scissor lift with such a drive for vehicles, for example those weighing up to 4.2t.
  • the invention is not limited to scissor lifts or those for vehicles with a weight up to 4.2t, but can be used for other types of electrohydraulically driven lifting or lifting platform.
  • the invention may be used for mounting platforms or tire changing platforms with swivel arm lifting mechanisms actuated by one or more hydraulic cylinders.
  • the invention can be used for electro-hydraulically operated lifts for motorcycles or trucks or tractors or towing vehicles, i. for lighter or heavier vehicles weighing less than or equal to 4.2t.
  • the invention for other electro-hydraulically driven lifts can be used, for example, for stamping lifts, with a centrally located punch (hydraulic cylinder), for two- or four-column lifts with a respective hydraulic cylinder for each column, for Einpfostenhebebhen and for four pillar lifts, where hydraulic cylinders the two rails raised by means of steel cables and pulleys.
  • the invention can generally be used for electrohydraulically operated lifting devices.
  • Scissor lifts typically include paired scissor arms, each pair of which has a main scissor arm and a counter scissor arm, the arms of each pair being pivotally interconnected in the center so that they can rotate about a horizontal axis relative to one another.
  • the lower end of the main scissors arm is stationary but rotatably fixed in the bottom area.
  • the lower end of the counter-scissor arm is displaceable in the horizontal direction when opening the scissors.
  • the upper end of the counter-scissor arm is rotatably but stationarily mounted on a rail, while the upper end of the main scissor arm is guided horizontally movably on the rail.
  • an electro-hydraulic drive For loading the or each hydraulic cylinder, an electro-hydraulic drive is provided.
  • a drive comprises at least one electric motor, at least one hydraulic pump and a control device, via which a user controls the energization of the motor and the valves present in the system.
  • the pump When the electric motor is turned on, the pump is driven and pumps hydraulic oil into the hydraulic cylinder, whereupon it extends and, as a result, the two mutually associated scissor arms are pivoted relative to each other; That the pair of scissors opens.
  • the rail or the rails or the support arms are raised vertically with a possibly thereon load in a horizontal position.
  • the present invention is based on the object to improve the previous electro-hydraulic drive and preferably reduce the overall cost.
  • a combination of a gear pump and a smaller sized driven via an inverter electric motor can generate output pressures on the pump, on the one hand provide the necessary at the beginning of the extension of the scissor lift in a first extension of the working cylinder high forces and allowing a slow, smooth initial lifting of the load despite the unfavorable leverages, and on the other hand allowing a quick extension in a second extension of the working cylinder over the longest part of the stroke and ultimately allowing a gentle deceleration to the final position in a third extension of the working cylinder.
  • the combination of a frequency converter controlled electric motor and a hydraulic pump makes it possible to omit one of the two electric motors and the hydraulic pump driven by it, which saves costs and space and indeed significantly more cost than the frequency caused.
  • the frequency converter can operate at a high voltage in a low speed range from the frequency converter without unduly exceeding the rating of the electric motor. As a result, the output torque of the electric motor at low speed and thus the delivery pressure of the hydraulic pump (s) can be increased. As a result, the extension of the hydraulic cylinder in the first region at low speed can be positively influenced in order to achieve the desired smooth start under unfavorable leverage.
  • the at least one hydraulic pump is a positive-displacement pump, in particular a gear pump, whose flow rate is approximately proportional to the rotational speed of the electric motor.
  • the hydraulic circuit comprises two hydraulic pumps or a double pump driven by an electric motor.
  • an electric motor with 4 kW (instead of two such electric motors as previously required).
  • each hydraulic pump or each branch of the double pump pressurizes at least one working cylinder with hydraulic fluid.
  • control means for controlling the frequency converter and therefore the speed of the electric motor controls it in a third extension range, in the final phase of extension of the hydraulic cylinders, i. the lifting of the stage, with a decreasing speed such that the at least one hydraulic pump extends the at least one working cylinder with decreasing speed.
  • the electric motor is a three-phase asynchronous motor.
  • the frequency converter of the electric motor operates with a vector control.
  • the phases of the electric motor impressed three-phase current are shifted so that the supplied torque from the electric motor is increased at low speed, whereby the delivered output pressure of the hydraulic pump (s) can be further increased, and thereby the extension of the hydraulic cylinder in the first extension range at low Speed can be positively influenced to achieve the desired smooth start under unfavorable leverage.
  • a working cylinder is provided which raises both sides of the lift together.
  • two additional working cylinders are provided, of which one each lifts a lifting device of the lifting platform.
  • the invention also provides a method for operating a drive for a lifting device, in particular for a lift or scissor lift, which provides a hydraulic circuit with at least one hydraulic pump, which acts on at least one working cylinder with hydraulic fluid, an electric motor for driving the at least one hydraulic pump, a frequency converter for Controlling the electric motor and a control device for controlling the frequency converter, comprising the following steps: controlling the frequency converter and therefore the rotational speed of the electric motor by the control device, so that the electric motor is driven in a first region at a lower speed such that the at least one hydraulic pump the at least one working cylinder extends at a lower speed, and is driven in a second region at a higher speed such that the at least one hydraulic pump, the at least one Arb cylinder expands faster.
  • the method comprises the further step of controlling the frequency converter and therefore the rotational speed of the electric motor by the control device so that the electric motor is driven in a third region at a lower speed such that the at least one hydraulic pump decreases the at least one working cylinder with decreasing speed extending.
  • Fig. 1 shows an example of a scissor lift 10 according to the invention in an intermediate position, ie between a fully retracted and a fully extended position.
  • the scissor lift 10 comprises two left main scissors arms 14l, 14l 'and two left scissor arms 16l, 161' and two right main scissor arms 14r, 14r 'and two right counter scissors arms 16r, 16r', each rotatable on the left side and right side in the center M about an axis H. connected to each other, so that the main scissor arms and counter-scissor arms can rotate relative to each other about a horizontal axis H.
  • the lower end of the left main scissor arms 141, 14l ' is fixed but rotatable in the bottom area, for example fixed to the bottom of a left pit.
  • the lower end of the left counter-scissor arms 16l, 16l ' is displaceable in the horizontal direction in the left pit.
  • the lower end of the right main scissor arms 14r, 14r ' is fixed but rotatably fixed in the bottom area, for example at the bottom of a right pit.
  • the upper end of the left counter-scissor arms 16l, 16l ' is rotatably but fixedly mounted on a left rail 12l, while the upper end of the associated left main scissor arms 14l, 14l 'on the left rail 12l is guided horizontally movable.
  • the upper end of the right-hand counter-scissor arms 16r, 16r ' is rotatably but fixedly mounted on a right-hand rail 12r, while the upper end of the associated right-hand main scissor arms 14r, 14r' on the right-hand rail 12r is guided to be horizontally movable.
  • DGr from the midpoints M of the counter-scissor arms 16l, 16l ' or 16r, 16r 'is, in each case two left working cylinder 18l, 18l' and two right working cylinder 18r, 18r 'hinged.
  • This scissor lift 10 which is divided into left and right halves, leaves a space between the left and right scissor arms so that workshop personnel can pass unhindered between the scissor arms and have access to the underside of a vehicle resting on the tracks.
  • the four working cylinders 18l, 18l ', 18r, 18r' are supplied with hydraulic oil via hoses, not shown, by a double pump 26l, 26r designed as a double gear pump.
  • the maximum operating pressure is 240 bar.
  • Each pump branch is, for example, designed to deliver 4.8 cc / rev or 6.6 l / min.
  • the drive of the double pump 26l, 26r via a single formed as a three-phase asynchronous electric motor 22, which is connected directly to the double pump 26l, 26r.
  • the rated power of the electric motor 22 is 4 kW.
  • the electric motor 22 is controlled via a frequency converter 24, which in turn can be activated by an operator via a control device 20.
  • Fig. 2 schematically shows a hydraulic circuit 30 with the double pump 26l, 26r, the electric motor 22, the frequency converter 24 and the control device 20th according to an embodiment of the present invention.
  • the drive comprises the part of the hydraulic circuit 30 below the dot-dash line A --- A.
  • the part of the hydraulic circuit 30 above the dot-dash line A --- A is assigned to the scissor lift 10 itself.
  • the driven by the controller 20 and the frequency converter 24 electric motor 22 drives the double pump 26l, 26r.
  • the double pump 26l, 26r pushes hydraulic oil through respective left and right pressure pipes 32l, 32r respectively associated with the left and right working cylinders 18l, 18l ', 18r, 18r' via left and right working cylinder valves 34l, 34l ', 34r, 34r '.
  • two post-elevating cylinders 42l, 42r, one for the left side and one for the right side of left and right post-lifting means 40l, 40r may be connected to the post-elevating valves 44l, 44r and the pressure lines 32l, 32r by the double pump 26l, 26r with hydraulic oil be charged.
  • the lowering of the lift 10 is carried out with the electric motor 22 under the weight of the lift and possibly the vehicle thereon by opening the proportional valves 36l, 36r, whereby the hydraulic oil does not flow through the pressure lines 32l, 32r in the direction of the pump, but through the line branches after the proportional valves 36l, 36r in a tank 38th
  • the operation of the scissors lift 10 is as follows. After an operator has switched on the scissors lift 10 by an input to the control device 20, this first controls the frequency converter 24 and therefore the rotational speed of the electric motor 22 such that the electric motor 22 rotates in a first region at a lower speed, so that the double pump 26l , 26r extends the four power cylinders 181, 181 ', 18r, 18r' at a lower speed in a first region of the stroke.
  • the control device 20 controls the frequency converter 24 and thus the rotational speed of the electric motor 22 such that the electric motor 22 in a second region with a higher speed rotates, so that the double pump 26l, 26r the four working cylinders 18l, 18l ', 18r, 18r' extends faster in a second region of the stroke.
  • the controller 20 controls the frequency converter 24 in a third region of the stroke such that the rotational speed of the electric motor 22 gently decreases, so that the scissor lift 10 also expires smoothly.
  • the lowering of the scissor lift 10 takes place when the electric motor 22 is switched off by opening a left and right proportional valve 36l, 36r.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
EP16182532.8A 2015-08-06 2016-08-03 Entrainement de dispositif de levage electro-hydraulique, en particulier elevateur Active EP3127855B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015112974.4A DE102015112974A1 (de) 2015-08-06 2015-08-06 Antrieb für eine elektrohydraulische betriebene Hebeeinrichtung, insbesondere Hebebühne

Publications (2)

Publication Number Publication Date
EP3127855A1 true EP3127855A1 (fr) 2017-02-08
EP3127855B1 EP3127855B1 (fr) 2021-11-03

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EP16182532.8A Active EP3127855B1 (fr) 2015-08-06 2016-08-03 Entrainement de dispositif de levage electro-hydraulique, en particulier elevateur

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EP (1) EP3127855B1 (fr)
DE (1) DE102015112974A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022100774A3 (fr) * 2020-11-14 2022-07-21 Autoservice.Krienelke Gmbh Pont élévateur inclinable pour véhicules à moteur
WO2023043472A1 (fr) * 2021-09-15 2023-03-23 Terex South Dakota, Inc. Dispositif de levage et procédé de commande sur une pente
WO2023043469A1 (fr) * 2021-09-15 2023-03-23 Terex South Dakota, Inc. Dispositif de levage et procédé de commande

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06323303A (ja) * 1993-05-12 1994-11-25 Koyo Mach Ind Co Ltd 油圧アクチュエータ駆動装置
DE19631804A1 (de) * 1996-07-10 1998-01-15 Rexroth Mannesmann Gmbh Hydraulische Hubeinrichtung
US20120023840A1 (en) * 2009-04-10 2012-02-02 Bin Yuan Main Work Construction Method for Reinforced Concrete Building and Building Construction Machine
US20140165281A1 (en) * 2014-02-19 2014-06-19 Hamidreza Khorsandraftar Security system for artificial water bodies
CN204226328U (zh) * 2014-10-16 2015-03-25 江苏海力达机电制造有限公司 两级速度液压缸及应用该两级速度液压缸的升降机构

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2312213A (en) * 1941-06-18 1943-02-23 Oilgear Co Hydraulic press
DE102007059304A1 (de) * 2007-12-07 2009-06-10 Otto Nussbaum Gmbh & Co. Kg Hebebühne für Kraftfahrzeuge
DE202013100340U1 (de) * 2012-07-13 2013-02-08 Rofa Industrial Automation Ag Hubtischsteuerung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06323303A (ja) * 1993-05-12 1994-11-25 Koyo Mach Ind Co Ltd 油圧アクチュエータ駆動装置
DE19631804A1 (de) * 1996-07-10 1998-01-15 Rexroth Mannesmann Gmbh Hydraulische Hubeinrichtung
US20120023840A1 (en) * 2009-04-10 2012-02-02 Bin Yuan Main Work Construction Method for Reinforced Concrete Building and Building Construction Machine
US20140165281A1 (en) * 2014-02-19 2014-06-19 Hamidreza Khorsandraftar Security system for artificial water bodies
CN204226328U (zh) * 2014-10-16 2015-03-25 江苏海力达机电制造有限公司 两级速度液压缸及应用该两级速度液压缸的升降机构

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022100774A3 (fr) * 2020-11-14 2022-07-21 Autoservice.Krienelke Gmbh Pont élévateur inclinable pour véhicules à moteur
WO2023043472A1 (fr) * 2021-09-15 2023-03-23 Terex South Dakota, Inc. Dispositif de levage et procédé de commande sur une pente
WO2023043469A1 (fr) * 2021-09-15 2023-03-23 Terex South Dakota, Inc. Dispositif de levage et procédé de commande

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Publication number Publication date
EP3127855B1 (fr) 2021-11-03
DE102015112974A1 (de) 2017-02-09

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