EP2450305A1 - Chariot de manutention doté d'un capteur de déformation dans le cylindre d'inclinaison - Google Patents

Chariot de manutention doté d'un capteur de déformation dans le cylindre d'inclinaison Download PDF

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Publication number
EP2450305A1
EP2450305A1 EP11008401A EP11008401A EP2450305A1 EP 2450305 A1 EP2450305 A1 EP 2450305A1 EP 11008401 A EP11008401 A EP 11008401A EP 11008401 A EP11008401 A EP 11008401A EP 2450305 A1 EP2450305 A1 EP 2450305A1
Authority
EP
European Patent Office
Prior art keywords
mast
tilting
cylinder
truck according
load
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
EP11008401A
Other languages
German (de)
English (en)
Other versions
EP2450305B1 (fr
Inventor
Hendrik Geilsdorf
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.)
Jungheinrich AG
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Jungheinrich AG
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Filing date
Publication date
Application filed by Jungheinrich AG filed Critical Jungheinrich AG
Publication of EP2450305A1 publication Critical patent/EP2450305A1/fr
Application granted granted Critical
Publication of EP2450305B1 publication Critical patent/EP2450305B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, 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
    • B66F9/00Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075Constructional features or details
    • B66F9/08Masts; Guides; Chains
    • B66F9/082Masts; Guides; Chains inclinable
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, 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
    • B66F17/00Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/003Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks

Definitions

  • the invention relates to an industrial truck according to the preamble of patent claim 1.
  • the task of industrial trucks is, inter alia, the transport of loads whose load center is usually outside of the footprint spanned by the vehicle contact points.
  • a counterweight is used which, in a defined load range, ensures that at least the overall center of gravity of the vehicle and the load lies within the contact area and the vehicle is correspondingly stable.
  • Picking up loads that are too heavy or picking up loads with the center of gravity too far from the vehicle can endanger the stability of the truck.
  • dynamic processes such as braking or reverse acceleration with a raised load, the risk of the vehicle tipping over its front axle is very high.
  • the invention has for its object to provide an industrial truck, in which a load torque can be determined in a simple manner.
  • the truck according to the invention has a drive part and a load part, which in turn has a mast pivotable about a tilting mast and arranged on the mast load bearing means.
  • An inclination of the mast ie a pivoting of the mast from the drive part away or on this, is adjustable by means of at least one tilting cylinder having at a front end fastening means for connection to the mast and at a rear end fastening means for connection to the drive part.
  • At least one of the fastening means has at least one deformation sensor for measuring a force acting on the tilting cylinder.
  • an evaluation unit is provided, against which the value for the measured force is applied, and which determines a load moment acting on the tilting axis from the measured force and a distance X N between the tilting cylinder and the tilting axis.
  • the force transmitted by the tilting cylinder is measured by means of deformation sensors in the region of the fastening means of the tilting cylinder.
  • the force measured at this location depends exclusively on the load torque and thus very accurately.
  • the measurement results are independent of a lateral bending of the mast. Nonlinear effects such as cylinder friction also have no influence on the measurement.
  • This principle can be easily transferred to other trucks with tilting cylinders, regardless of whether they are three- or four-wheeled counterbalanced trucks or reach trucks, regardless of the remaining body of the truck.
  • the value for the load torque determined according to the invention can be displayed to the driver as information or used as a basis for corresponding protective measures (for example reduction of the speed, reduction of the maximum mast tilt and / or the lifting height).
  • the fastening means of the at least one tilting cylinder are each formed by a fork and / or an eye.
  • the fork corresponds to at least two parallel eyes.
  • the fastening means on a bolt by means of which the fastening means with the vehicle compartment or with the mast are connectable.
  • the attachment means in the form of eyes or forks with corresponding bolts are particularly easy to solve for maintenance purposes.
  • At least one bolt forms a deformation sensor in the form of a load measuring pin.
  • a load measuring bolt can be exchanged without effort against a conventional bolt.
  • the assembly of the deformation sensor is thus particularly easy to perform.
  • the deformation sensor is at least one press-fit sensor.
  • Press-fit sensors serve to detect deformations of loaded machine parts.
  • a sensor type with a cylindrical outer contour is used, which is pressed to detect the strain in a bore in the component to be monitored. This can be introduced due to its small footprint at almost any suitable location in a hole to be provided in the fastener. Thereafter, the component provided with the press-fit sensor can be further processed in the normal production flow.
  • the deformation sensor is at least one strain gauge. This can be particularly easily applied to the fastener and is particularly space-saving.
  • Each tilting cylinder preferably has at least one deformation sensor.
  • two hydraulic tilting cylinders are provided, which are hydraulically short-circuited. Parasitic effects, for example by lateral accelerations are thereby suppressed. Thus, the same force is transmitted from each tilt cylinder.
  • the distance between tilt cylinder and tilt axis changes slightly.
  • an average value for the distance for determining the load torque is used.
  • the distance is determined from a measured inclination of the mast.
  • a proximity switch is provided in the truck, which has a predetermined inclination of the mast, e.g. when the mast is in a vertical position, detected.
  • the distance between tilting cylinder and tilting axis is known for the given inclination and stored in a memory of the evaluation unit.
  • tilt cylinder 20 has a cylinder tube 22, a piston rod 24, a cylinder bottom 26 and line connections 28 for hydraulic fluid.
  • a fastening means 30 is provided in the form of a front fork 32.
  • the front fork 32 is bolted to the piston rod 24 and has a first piston rod eye 31 and a second piston rod eye 33 arranged parallel thereto, wherein the eyes 31, 33 are circular bores in a substantially semicircular component.
  • the piston rod eyes 31, 33 have a common central axis, which runs perpendicular to the longitudinal axis of the piston rod 24. Between the piston rod eyes 31, 33, an unillustrated eye of a mast 12 of an industrial truck 10 can be arranged.
  • a bolt 39 of the tilting cylinder can be connected at its front end 21 to the mast 12 of the truck 10.
  • a fastening means 30 is provided in the form of a rear fork 36.
  • the rear fork 36 has a first rear eye 35 and a second rear eye 37 arranged parallel thereto.
  • the rear eyes 35, 37 are circular holes in a substantially semicircular member and have a common central axis which is perpendicular to the longitudinal axis of the piston rod 24.
  • the tilting cylinder can be connected at its rear end 29 via an unillustrated eye of a drive part 11 of the truck 10 with this.
  • At least one of the two bolts 39 can be replaced by a load measuring pin or force measuring pin.
  • the force measuring bolt assumes the function of the usual connecting bolt 39 between force-transmitting machine elements, ie the mast 12 and the tilting cylinder 20 and the tilting cylinder 20 and the drive member 11 of the truck 10.
  • Such, known per se load measuring bolt is a bolt, a simultaneous measurement of allows tensile and compressive forces acting at this point.
  • a bore not shown, is then provided, which receives the press-in sensor.
  • This hole for the press-fit is not to be confused with the much larger eyes 31, 33, 35, 37 in the forks 32, 36.
  • the hole for the press-fit sensor may be parallel to the eyes 31, 33, 35, 37 or perpendicular to them ,
  • strain gauges can also be provided as deformation sensors. These may be applied to one of the forks 32, 36 or both, e.g. be glued on.
  • the mast 12 is movably connected via the tilting cylinder 20 with the drive part 11 of the truck 10.
  • the mast 12 is articulated on a tilting axis 16, which in turn is fixedly connected to the drive part of the truck 10.
  • the mast 12 can be pivoted about the tilting axis 16 by means of the tilting cylinder 20.
  • the mast 12 of a in Fig. 2 shown vertical position on the drive member 11 to, or inclined away from him.
  • a load supporting means 14 for example in the form of Hubgabeln
  • a force is obtained which acts on the tilting cylinder 20 of the industrial truck 10. Furthermore, a distance X N between tilting cylinder 20 and tilting axis 16 is known. The distance X N can be determined from a measured inclination of the mast 12 trigonometrically. The distance X N can already be stored as a function of the mast tilt in the evaluation. From this distance and the measured force can be determined via an outer product acting on the tilting axis 16 Lastmoment. This load torque can now be displayed or used as a basis for appropriate protective measures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Civil Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
EP11008401.9A 2010-11-06 2011-10-19 Chariot de manutention doté d'un capteur de déformation dans le cylindre d'inclinaison Active EP2450305B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010050683 DE102010050683A1 (de) 2010-11-06 2010-11-06 Flurförderzeug mit Verformungssensor im Neigezylinder

Publications (2)

Publication Number Publication Date
EP2450305A1 true EP2450305A1 (fr) 2012-05-09
EP2450305B1 EP2450305B1 (fr) 2016-04-20

Family

ID=44862315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11008401.9A Active EP2450305B1 (fr) 2010-11-06 2011-10-19 Chariot de manutention doté d'un capteur de déformation dans le cylindre d'inclinaison

Country Status (2)

Country Link
EP (1) EP2450305B1 (fr)
DE (1) DE102010050683A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3034456A1 (fr) * 2014-12-16 2016-06-22 STILL GmbH Procede de determination d'application des charges pour un chariot de manutention
WO2022186723A1 (fr) 2021-03-03 2022-09-09 Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт автоматики им. Н.Л. Духова" (ФГУП "ВНИИА") Bus double pour systèmes de contrôle automatisé

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020130064A1 (de) 2020-11-13 2022-05-19 Jungheinrich Aktiengesellschaft Flurförderzeug mit einem Kraftsensor im Neigezylinder

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3831492A (en) * 1972-12-04 1974-08-27 Eaton Corp Overload protection device for counterbalance vehicles
US4068773A (en) * 1975-04-03 1978-01-17 Allis-Chalmers Corporation Lift vehicle with fail-safe overload protective system
EP0483493A2 (fr) * 1990-09-28 1992-05-06 Linde Aktiengesellschaft Chariot élévateur avec dispositif de surveillance de l'état de charge
US5929389A (en) * 1997-07-19 1999-07-27 Robert Bosch Gmbh Device and method for determining weight of a load
JP2001206695A (ja) * 2000-01-31 2001-07-31 Komatsu Forklift Co Ltd 産業車両の転倒警報装置
DE10304658A1 (de) * 2003-02-05 2004-08-19 Bosch Rexroth Ag Flurförderfahrzeug
DE102008035574A1 (de) 2008-07-30 2010-02-04 Linde Material Handling Gmbh Verfahren zur Bestimmung des Lastschwerpunktes einer auf einem Lastaufnahmemittel eines Flurförderzeugs befindlichen Last

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19745923A1 (de) * 1997-10-17 1999-04-22 Metz Feuerwehrgeraete Gmbh Vorrichtung zum Einspannen eines Auslegersystems
JP2001261297A (ja) * 2000-03-22 2001-09-26 Toyota Autom Loom Works Ltd 産業車両の前後方向の荷重モーメント測定装置
DE10015707A1 (de) * 2000-03-29 2001-10-04 Digalog Gmbh Verfahren und Vorrichtung zum Erkennen kritischer Fahrzustände für Transportfahrzeuge mit höhenveränderlicher Lastlage
DE102007047838A1 (de) * 2007-11-21 2009-05-28 Zf Friedrichshafen Ag Antrieb für ein Flurförderzeug

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3831492A (en) * 1972-12-04 1974-08-27 Eaton Corp Overload protection device for counterbalance vehicles
US4068773A (en) * 1975-04-03 1978-01-17 Allis-Chalmers Corporation Lift vehicle with fail-safe overload protective system
EP0483493A2 (fr) * 1990-09-28 1992-05-06 Linde Aktiengesellschaft Chariot élévateur avec dispositif de surveillance de l'état de charge
US5929389A (en) * 1997-07-19 1999-07-27 Robert Bosch Gmbh Device and method for determining weight of a load
JP2001206695A (ja) * 2000-01-31 2001-07-31 Komatsu Forklift Co Ltd 産業車両の転倒警報装置
DE10304658A1 (de) * 2003-02-05 2004-08-19 Bosch Rexroth Ag Flurförderfahrzeug
DE102008035574A1 (de) 2008-07-30 2010-02-04 Linde Material Handling Gmbh Verfahren zur Bestimmung des Lastschwerpunktes einer auf einem Lastaufnahmemittel eines Flurförderzeugs befindlichen Last

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3034456A1 (fr) * 2014-12-16 2016-06-22 STILL GmbH Procede de determination d'application des charges pour un chariot de manutention
WO2022186723A1 (fr) 2021-03-03 2022-09-09 Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт автоматики им. Н.Л. Духова" (ФГУП "ВНИИА") Bus double pour systèmes de contrôle automatisé

Also Published As

Publication number Publication date
DE102010050683A1 (de) 2012-05-10
EP2450305B1 (fr) 2016-04-20

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