EP4466217B1 - Dispositif de compensation de charge pour une application de levage comprenant un objet à soulever ou à abaisser - Google Patents

Dispositif de compensation de charge pour une application de levage comprenant un objet à soulever ou à abaisser

Info

Publication number
EP4466217B1
EP4466217B1 EP23710225.6A EP23710225A EP4466217B1 EP 4466217 B1 EP4466217 B1 EP 4466217B1 EP 23710225 A EP23710225 A EP 23710225A EP 4466217 B1 EP4466217 B1 EP 4466217B1
Authority
EP
European Patent Office
Prior art keywords
lifting
load balancing
spring
balancing device
scissor
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.)
Active
Application number
EP23710225.6A
Other languages
German (de)
English (en)
Other versions
EP4466217C0 (fr
EP4466217A1 (fr
Inventor
Steven Walther
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP4466217A1 publication Critical patent/EP4466217A1/fr
Application granted granted Critical
Publication of EP4466217B1 publication Critical patent/EP4466217B1/fr
Publication of EP4466217C0 publication Critical patent/EP4466217C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/12—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated comprising toggle levers
    • 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
    • B66F7/0608—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement driven by screw or spindle
    • 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
    • B66F7/0633—Mechanical arrangements not covered by the following subgroups
    • 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

Definitions

  • the invention relates to a load balancing device for hoists and similar applications according to the preamble of patent claim 1.
  • the invention relates to a mechanically acting load balancing device for increasing the performance and efficiency of vertical lifting applications.
  • This device is intended to be flexibly integrated into existing or newly designed lifting systems, thereby reducing the load on the drive train or the entire lifting mechanism and thus significantly increasing the efficiency of the overall system.
  • This reduction in load not only reduces drive power and energy consumption, but also allows the entire lifting device to be made smaller and lighter, increases the load-bearing capacity, and thus increases the power density of the overall system.
  • the printed matter US 5,833,198 A - Graetz "MECHANICALLY OPERATED LIFT TABLE" also shows a lifting table with scissor kinematics, in which a spring element is arranged between the legs of a pair of scissors, wherein the spring characteristic is selected such that the lifting table, when subjected to a load package, is lowered essentially by the overall height of the load package, resulting in an essentially load-independent overall height of the loaded lifting table.
  • JP H07 267594 A Mizouchi Seiji "MOTOR-DRIVEN TABLE LIFTER" shows a scissor lift table, where To support the drive, a compression spring is mounted above a drive spindle. JP H07 267594 A discloses the preamble of claim 1.
  • the disadvantage of a direct integration of the spring elements is that a constant force curve cannot be generated over the entire stroke, since the spring force increases when moving together according to the spring characteristic curve.
  • a lifting application lifting application, hoist, lifting-lowering conveyor device, lifting table or the like
  • the required solution should be lightweight and safe to maintain after moving to a maintenance position.
  • a load balancing device for a lifting application with an object to be lifted or lowered comprising a movable platform, wherein the platform supports the object, and wherein the platform is supported by at least one spring element for load balancing.
  • the spring element acts on a spreading unit, which transmits a spring force of the spring element for spreading into a scissor arrangement, wherein the scissor arrangement exerts the spring force as a resulting lifting force on the platform, and wherein the lifting geometry formed by the spreading unit and the scissor arrangement provides a substantially constant lifting force over a substantial lifting distance of the platform.
  • the load balancing device is also characterized by compact dimensions, flexible handling and high performance with low manufacturing, assembly and maintenance costs.
  • the stroke geometry is advantageously designed in such a way that a changing spring force during the stroke is essentially compensated by a changing lever effect. This results in essentially constant support, thus optimized load balancing, even with steep spring characteristics, and in many cases makes a high spring preload obsolete for using the spring in a working range that is as linear as possible.
  • the spreading unit comprises push rods, wherein the push rods are each articulated between the spring accumulator and a scissor arm of the scissor arrangement.
  • the spreading unit advantageously acts on a curved geometry, whereby the curved geometry determines the course of the lever action of the spreading unit on the scissor arrangement.
  • This allows non-linear spring force curves to be compensated; moreover, it is possible to design a variable support force during the stroke, which is desired in some applications, by means of a corresponding characteristic of the curved geometry.
  • the curved geometry is formed by at least one curved surface of a scissor arm of the scissor arrangement, whereby the spring force of the spreading unit is determined by means of a sliding piece or a roller construction acts on the curved surface.
  • the expansion unit has an expanding wedge geometry on at least one side. This allows for a particularly compact design. Furthermore, even flat spring characteristics can be easily converted into constant load balancing or a constant support force. Depending on the application, it may be useful to provide an expanding wedge arrangement at one end of the tension spring and push rods at the other end of the spring. A combination of a curved geometry with push rods or an expanding wedge arrangement is also possible.
  • the load balancing device can also perform a vertical guiding function; the supported lifting gear can then be designed with a simpler structure and be limited to the lifting function.
  • the Figure 1 shows schematically on the left two design variants A1, A2 of the gear kinematics of the device with gear elements and on the right the corresponding force-stroke curve.
  • the figure shows two centrally connected, mutually pivoting scissor arms (3), to each of which two pivoting push rods (4) are connected, with the opposite side of the push rods being coaxially mounted.
  • a tension-acting spring energy storage device (5) is connected, also coaxially mounted.
  • the movable platform, with which the weight of the object to be moved is introduced into the arrangement, is not shown in the schematic for reasons of clarity. Representations of the Figures 1 - 5 not shown.
  • the tensile force emanating from the energy storage device (spring arrangement) causes the spreading of the of the scissor arms (3). Consequently, the compensating force (F) acts at the ends of the scissor arms.
  • a lifting curve geometry (7) (short: lifting curve or curve geometry) to the scissor arms (3) on the fixed or floating bearing side instead of the push rods, in order to achieve an expansion of the scissors (3) by means of an expansion shaft running along the lifting curve; such variants D and E are shown in the Figures 4 and 5 shown.
  • the reference symbol (3) is used both for the scissor mechanism (short: scissors) and for an individual scissor arm.
  • the selected ratios of scissor arm and thrust strut lengths in conjunction with the position of the pivot axes and the spring characteristic, as well as the characteristics of the stroke curves, allow the force-stroke curve of the device to be influenced.
  • the schematically illustrated force-stroke curve in Figure 1 It can be seen that a nearly constant lifting force can be achieved. If the actual force curve is compared with an ideal constant force curve, linearity deviations of less than ⁇ 1% are technically feasible. A linearity deviation of ⁇ 15% is considered to be the upper limit of the cost-benefit ratio.
  • the floating bearing guide shown in variants B, C, D, and E can also be omitted if a linear, vertical guide function is not required for specific applications, or if the lifting platform already has a vertical guide. This is often the case when existing lifting devices are retrofitted with a load balancing device.
  • variants from Figure 1 and variant D from Figure 4 and application examples are shown; variants B, C and E show variations in other combinations of spreading agents.
  • the Figure 6 shows a technical implementation of design variant A1. This illustrates the interaction of the mechanism's gear elements.
  • the spring accumulator integrated into the lifting mechanism consists of a spring assembly composed of two compression springs mounted one inside the other. These are mechanically integrated between the thrust struts in such a way that the spring accumulator unit acts like a tension spring.
  • the use of solid compression springs allows for a particularly high power density.
  • the Figure 8 shows a technical version of variant D ( Figure 4 ) without guide function with 4 parallel acting oval wire tension springs as energy storage.
  • the guide on the floating bearing side has been omitted, thus eliminating the linear, vertical guide function.
  • the guidance of the expansion shaft along the centrally installed lifting curve is advantageously achieved by means of a profile roller.
  • An increase in the compensation force is achieved by adding pairs of spring elements. It is therefore also technically possible to Figure 8
  • the design shown can be operated with, for example, just two or with six or eight parallel tension springs.
  • the high spring preload wound into the oval wire tension springs allows the desired compensation force to be generated without the need for additional preloading of the springs. Since the tension springs are compressed to a block in the upper stroke position, no additional measures are required to isolate the force or energy from the energy storage device during maintenance.
  • the Figure 9 shows the integration of two parallel load balancing devices from Fig.5 into an existing lifting and lowering conveyor.
  • This lifting and lowering conveyor is used to convey a body-in-white in automotive series production.
  • by integrating version D from Figure 4 This partially relieves the load on the hoist and drive train, and partly increases the load-bearing capacity of the device (in this case by 40%). Since this retrofitting involves relatively little effort and eliminates the need for a costly complete conversion of the lifting and lowering device to higher load capacities, it results in significant economic advantages.
  • AGVs driverless transport vehicles
  • the load balancing device shown for an AGV has both a vertical guidance and drive function integrated, which enables it to be used as a lifting table.
  • the load balancing device with guide and drive function shown can be used as a lifting table for high loads up to 3 t on automated guided vehicles.
  • the drive function is provided by two electrically synchronized push chain drives, and the vertical guidance and load balancing function is provided by two centrally installed load balancing devices made of Figure 6 realized.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Manipulator (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (5)

  1. Dispositif de compensation de charge pour une application de levage comprenant un objet à soulever ou à abaisser,
    comprenant une plateforme mobile, dans lequel la plateforme porte l'objet,
    dans lequel la plateforme est, pour la compensation de charge, assistée par au moins un élément (5) de ressort,
    dans lequel l'élément (5) de ressort agit sur une unité (4, 6, 7) d'écartement, qui applique une force de ressort de l'élément (5) de ressort pour l'écartement à un agencement (3) de ciseaux, dans lequel, par l'agencement de ciseaux, la force de ressort agit sur la plateforme en soulèvement, comme une force de levage résultante, et dans lequel, par une géométrie de levage formée au moyen de l'unité (4, 6, 7) d'écartement et de l'agencement (3) de ciseaux, une force de levage sensiblement constante est donnée sur une course de levage sensible de la plateforme,
    caractérisé
    en ce que l'élément (5) de ressort est conformé sous la forme d'au moins deux ressorts de traction agissant en parallèle et est précontraint avec une précontrainte de ressort si grande que l'élément (5) de ressort vient en bloc dans une position supérieure de levage.
  2. Dispositif de compensation de charge suivant la revendication 1,
    caractérisé
    en ce que l'unité (4, 6, 7) d'écartement comprend des entretoises (4) de poussée, dans lequel les entretoises (4) de poussée sont articulées respectivement entre l'élément (5) de ressort et un bras de ciseaux de l'agencement (3) de ciseaux.
  3. Dispositif de compensation de charge suivant la revendication 1 ou 2,
    caractérisé
    en ce que l'unité (4, 6, 7) d'écartement agit sur une géométrie (7) courbe, dans lequel la géométrie (7) courbe prescrit le tracé de l'effet de levier de l'unité (4, 6, 7) d'écartement sur l'agencement (3) de ciseaux.
  4. Dispositif de compensation de charge suivant la revendication 3,
    caractérisé
    en ce que la géométrie (7) courbe est formée par au moins une surface incurvée d'un bras de ciseaux de l'agencement (3) de ciseaux, dans lequel la force de ressort s'applique à la surface incurvée en passant par l'unité (4, 6, 7) d'écartement au moyen d'un patin ou d'une construction à roulettes.
  5. Dispositif de compensation de charge suivant l'une des revendications précédentes,
    caractérisé
    en ce que l'unité (4, 6, 7) d'écartement a au moins d'un côté une géométrie à coin d'écartement.
EP23710225.6A 2022-03-21 2023-02-22 Dispositif de compensation de charge pour une application de levage comprenant un objet à soulever ou à abaisser Active EP4466217B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22163264.9A EP4249420A1 (fr) 2022-03-21 2022-03-21 Dispositif de compensation de charge pour une application de levage comprenant un objet à soulever ou à abaisser
PCT/EP2023/054424 WO2023180002A1 (fr) 2022-03-21 2023-02-22 Dispositif de compensation de charge pour une application de levage avec un objet à lever ou à abaisser

Publications (3)

Publication Number Publication Date
EP4466217A1 EP4466217A1 (fr) 2024-11-27
EP4466217B1 true EP4466217B1 (fr) 2025-08-27
EP4466217C0 EP4466217C0 (fr) 2025-08-27

Family

ID=80928853

Family Applications (2)

Application Number Title Priority Date Filing Date
EP22163264.9A Withdrawn EP4249420A1 (fr) 2022-03-21 2022-03-21 Dispositif de compensation de charge pour une application de levage comprenant un objet à soulever ou à abaisser
EP23710225.6A Active EP4466217B1 (fr) 2022-03-21 2023-02-22 Dispositif de compensation de charge pour une application de levage comprenant un objet à soulever ou à abaisser

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP22163264.9A Withdrawn EP4249420A1 (fr) 2022-03-21 2022-03-21 Dispositif de compensation de charge pour une application de levage comprenant un objet à soulever ou à abaisser

Country Status (6)

Country Link
US (1) US12358768B2 (fr)
EP (2) EP4249420A1 (fr)
CN (1) CN118900817B (fr)
ES (1) ES3055397T3 (fr)
PL (1) PL4466217T3 (fr)
WO (1) WO2023180002A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7754042B2 (ja) * 2022-10-06 2025-10-15 株式会社ダイフク 押圧装置
US12446668B1 (en) 2024-03-13 2025-10-21 Peter A Feinstein Patents LLC Band employing bistable compliant scissor linkages and hands-free actuation mechanism
US12369695B1 (en) 2024-03-13 2025-07-29 Peter A Feinstein Patents LLC Band employing bistable magnetic actuator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5632209A (en) * 1993-09-02 1997-05-27 Bishamon Industries Corporation Lift table

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DE102012020264B4 (de) 2012-10-12 2018-11-15 EXPERT-TÜNKERS GmbH Motorisch in vertikaler Richtung höhenverstellbarer Hubtisch, zur Verwendung im Karosseriebau der Kfz-Industrie
US9310753B2 (en) * 2013-04-22 2016-04-12 Xerox Corporation Spring assist scissor lift
CN207108354U (zh) * 2017-06-27 2018-03-16 上海巨米文化传媒有限公司 一种使用在升降平台上的弹簧机构
CN206970114U (zh) * 2017-07-18 2018-02-06 昆山普罗虎贲升降技术有限公司 剪叉式升降台
EP3476792A1 (fr) * 2017-10-25 2019-05-01 Flexlift Hubgeräte GmbH Table élévatrice à compas
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Also Published As

Publication number Publication date
WO2023180002A1 (fr) 2023-09-28
US20250109001A1 (en) 2025-04-03
CN118900817A (zh) 2024-11-05
US12358768B2 (en) 2025-07-15
CN118900817B (zh) 2025-10-21
EP4466217C0 (fr) 2025-08-27
ES3055397T3 (en) 2026-02-11
EP4249420A1 (fr) 2023-09-27
EP4466217A1 (fr) 2024-11-27
PL4466217T3 (pl) 2026-01-19

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