EP0489230B2 - Hubgerüst, insbesondere für Hubfahrzeuge - Google Patents

Hubgerüst, insbesondere für Hubfahrzeuge Download PDF

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Publication number
EP0489230B2
EP0489230B2 EP91114704A EP91114704A EP0489230B2 EP 0489230 B2 EP0489230 B2 EP 0489230B2 EP 91114704 A EP91114704 A EP 91114704A EP 91114704 A EP91114704 A EP 91114704A EP 0489230 B2 EP0489230 B2 EP 0489230B2
Authority
EP
European Patent Office
Prior art keywords
lift
mast
cylinder
inclination
displacement
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.)
Expired - Lifetime
Application number
EP91114704A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0489230B1 (de
EP0489230A2 (de
EP0489230A3 (en
Inventor
Peter Dibbern, (Dipl.-Ing.)
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
Original Assignee
Jungheinrich AG
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
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Application filed by Jungheinrich AG filed Critical Jungheinrich AG
Publication of EP0489230A2 publication Critical patent/EP0489230A2/de
Publication of EP0489230A3 publication Critical patent/EP0489230A3/de
Application granted granted Critical
Publication of EP0489230B1 publication Critical patent/EP0489230B1/de
Publication of EP0489230B2 publication Critical patent/EP0489230B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices 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
    • B66F9/075—Constructional features or details
    • B66F9/08—Masts; Guides; Chains
    • B66F9/082—Masts; Guides; Chains inclinable

Definitions

  • the invention relates to a lifting device according to the preamble of claim 1.
  • a lifting device is from US-A-2 456 320 known.
  • a mast become known, on the extendable mast part a boom is attached to which to apply a counter torque on the mast a traction device that approaches the load moment should correspond. With the help of such Device becomes a deflection of the mast largely prevented, the applied Forces are introduced as pressure forces into the mast.
  • the known construction requires a complex Guide for the load chains as well as one additional considerable effort for generation the lifting forces. The effort is particularly high if masts with a free lift are provided are. Another disadvantage is that due to the boom and the traction device the overall depth of the mast is increased dramatically.
  • the traction device with the help of a preload roller to change in its tension.
  • the leader role can be operated by an adjustment cylinder, the one via a pressure reducer with the lifting cylinder is connected to the mast.
  • An adjustment of the load torque compensation becomes wise depending on the pressure made that prevails in the lifting cylinder.
  • the tension pulley has to absorb considerable forces and is therefore accordingly expensive to store.
  • the invention has for its object a Lifting device of the type mentioned at the beginning create the deformation with simple means in the mast and possibly in the mast holder or vehicle due to the load torque in every stroke range and with inclusion dynamic stresses balanced is that the position of the load when lifting does not change or changes only very slightly.
  • the mast holder or the mast itself adjustable and can changed in position with the help of the tilt drive become. It is known to be a mast to be swivel-mounted in the scaffold bracket, thereby e.g. the driver of a truck the position of the load handler can change to the caused by the mast deflection to change the unwanted position of the load handler. By swiveling the mast the mast deflection is not canceled, rather it remains in its extent consist.
  • the load handler can by swiveling the mast into one more or less reclined position approximately brought into a position in which it would be without mast deflection
  • the invention sees to automatically operate the recliner cylinder depending on the pressure in the lifting cylinder device.
  • the tilt adjustment cylinder adjusts that Mast regardless of its extended Length each by the amount resulting from the Load on the load handler results.
  • the size this load finds its equivalent in pressure in the lifting cylinder device.
  • the invention is based on the knowledge that that between the lifting height and the Resetting the load in a wide range linearizable relationship exists. With others Words, the adjustment path of the tilt adjustment cylinder is solely from the pressure in the lifting cylinder depending on what level that The mast is extended.
  • the mast or its Make holder adjustable and with a to couple the corresponding tilt adjustment cylinder If it does not prepare constructive and structural difficulties, the mast or its Make holder adjustable and with a to couple the corresponding tilt adjustment cylinder. An impairment how the mast works no more than an enlargement of the outer dimensions.
  • the tilt adjustment cylinder can be on the mast or on the scaffold bracket attack the mast.
  • the print page the mast lift cylinder device can preferably via a throttle directly with the tilt adjustment cylinder be connected. You can also choose one Pressure translation can be interposed.
  • a compression spring on the piston of the adjusting cylinder Act is used to apply the biasing force the adjustment cylinder with a hydraulic accumulator connected.
  • the mast lift cylinder preferably via a pressure relief valve connected to the adjusting cylinder.
  • the Pressure relief valve maintains a certain pressure upright in the amount of the preload in the adjusting cylinder.
  • the preload is appropriate adjustable, so that an adjustment of the mast lift cylinder prevailing pressure in the unloaded Condition is preserved. Is the preload of a spring force can be applied to the spring characteristic spring behavior adapted to the mast can be achieved.
  • the bending of the mast for a given load depends on its spring behavior.
  • the adjustment path of the adjustment cylinder at a given pressure is dependent the counter tension or the spring stiffness the counter spring. To adjust the Adjustment of the mast to the actually taking place A corresponding deformation takes place Coordination of the spring characteristics of the mast and preload spring.
  • a paired arrangement of tilt cylinders parallel and at a distance on one side of the mast provided torsional vibrations can also be provided dampen the mast.
  • torsional vibrations can also be provided dampen the mast.
  • an inclination of the mast for the purpose of compensating for deformation can also be obtained in that the vehicle its position changes.
  • an mast adjustment cylinder is connected to the mast holder is of the type described above and Way is operated.
  • a lifting vehicle 10 can be seen in FIG. 1 with a mast holder 12, the mast 14 records that is adjustable in height and a sled-like load handling device 16 holds. Details of the lifting vehicle 10 and the mast 14 need not be explained as they are general State of the art.
  • Fig. 1b it can be seen that by Picking up a load 18 on the load handler 16 the mast 14 due to the one-sided applied load torque bends. the initial situation is shown in dashed lines.
  • Fig. 1c to recognize that by resetting the Mast 14 towards the driver of the vehicle 10 from the position shown in Fig. 1b Position of the load suspension device 16 is obtained, which corresponds approximately to that of Fig. 1a.
  • a Pivotal movement of the mast 14 thus enables deformation compensation and stacking the load 18 in the correct position independently deformation of the mast 14.
  • the profiles 20, 22 are hung in 24 or 26 in camps. Camps are e.g. Components of the mast holder 12 according to Fig. 1.
  • the extendable mast part, not shown the mast 14 is with the help of the lifting cylinder 28 operated.
  • the hydraulic supply of the Lift cylinder 28 is not shown.
  • the printing section of the lifting cylinder 28 is hydraulic Line 30, a throttle 32 and a pressure relief valve 34 with a tilt cylinder 36 connected, the piston 38 via a rod 40 is articulated to a crossbar 42, with both Profiles 20, 22 of the mast 14 connected is.
  • a valve assembly 44 in line 30 that leads to a hydraulic source, serves as a lowering brake when retracting the mast 14.
  • a hydraulic pressure accumulator 46 On the other side of the piston 38 is with the cylinder 36 a hydraulic pressure accumulator 46 connected.
  • the gas volume 48 in the store 46 generates a pressure in the corresponding cylinder space, the pressure in the other cylinder space corresponds to that of the pressure chamber of the lifting cylinder 28 is derived when the mast from the jack 28 supported, but the load-bearing part is unencumbered.
  • the pressure relief valve 34 maintains the pressure upright in the assigned cylinder space, that in the unloaded State is built up. That pressure therefore keeps the back pressure due to the hydraulic Memory 46 stood. An actuation of the Mast 14, i.e. a corresponding pivoting therefore does not take place. Meanwhile increases the pressure in the lifting cylinder 28 due to predetermined load, the pressure in the corresponding Cylinder space higher. It leads to one Pivoting of the mast in the bearings 24, 26, in the manner described with reference to FIG. 1 and way to bring about a deformation compensation. The one at a certain pressure in the tilt cylinder 38 caused adjustment of the piston 38 depends on the characteristic which the gas volume 48. It is on the spring curve of the mast 14 matched. The throttle 32 ensures that pressure fluctuations in the Lift cylinder does not make an oscillating adjustment of the tilt cylinder 36 lead and causes damping when the mast vibrates.
  • the piston rod 40 is on one Articulated lever 50, which with an eccentric 52nd connected is.
  • the eccentric works with one facing Surface of the cross member 42 together. Dashed is an alternative position of the lever 50 shown.
  • Lever 50 and eccentric adjust Gearbox represents the power from the tilt cylinder 36 to be transferred to the mast 40. This allows the hydraulic performance of the Inclination cylinder 36 can be reduced.
  • a lifting cylinder 60 is not for one shown mast, which via a line 62nd connected to a hydraulic source, not shown is, via a line 64 with throttle 66 and Pressure relief valve 68 with the pressure side of a Tilt cylinder 70 connected.
  • the opposite Side of the piston is with a compression spring 72 acted upon.
  • the preload force of the spring 72 is indicated by a corresponding pressure on the counteracted opposite side of the piston, the the pressure in the lifting cylinder 60 in the unloaded Condition of the load bearing part corresponds.
  • the pressure relief valve 68 provides maintenance a predetermined pressure in the Tilt cylinder 70.
  • the adjustable throttle 66 serves for damping purposes.
  • a control valve 74 arranged with the the connection between the cylinders 60, 70 can be locked.
  • the valve 74 also controls the connection between a hydraulic Memory 76 and the other side of the tilt cylinder 70.
  • a pressure relief valve 80 is arranged in a corresponding line 78 .
  • line 78 is a switching valve, not shown connected for arbitrary actuation of the tilt cylinder 70, e.g. by the driver of a lifting vehicle.
  • Line 64 is also connected to a line 82 connected, also to a not shown Switch valve leads to the actuation of the tilt cylinder 70.
  • Automatic actuation of the tilt cylinder 70 depending on the pressure in Lift cylinder 60 takes place with valve 74 open, the pressure in the hydraulic accumulator 76 being the Bias in the tilt cylinder 70 determined.
  • FIG. 8 it can be seen that the holder can be adjusted to compensate for deformation to obtain.
  • the mast is with 90, which is held in a holder 92. If the mast 90 is deformed when it is picked up a load 94 (dashed line) takes place Deformation compensation by the holder 92 by one Pivotal point 96 with the help of a not shown Tilt drive is pivoted.
  • the standing mast 98 is not otherwise further indicated mast, the accommodated in a right-angled mast holder 100 is.
  • the mast holder is 100 designed to be movable.
  • Lifting vehicles with movable ones Masts are known per se.
  • the horizontal bar of the Mast holder 100 two rollers 102, 102a on that a career not shown in Fig. 9 roll.
  • His rod 106 is on an arm 108 articulated ⁇ with an eccentric 110 is connected.
  • the eccentric 110 is rotatably supported the roller 102a that rolls on a raceway 112 (Fig. 10).
  • the tilt cylinder 104 is with the lifting cylinder, not shown, for the mast connected.
  • the mast of a mast according to FIG. 11 with the profiles 120, 122 of a mast 126 about an axis 124 in the mast holder, not shown pivoted. Grips the profiles each an adjusting cylinder 126, 128, which over Chokes 130, 134 hydraulically interconnected and connected to mast lift cylinders 136, 138 are.
  • the hydraulic circuit corresponds e.g. the embodiment according to FIGS. 6 or 7, so that it is no longer discussed in detail needs to be.
  • With the help of the tilt cylinder 126, 128 and the chokes 130, 134 can also torsional vibrations of the mast 126 be dampened.
  • Grab the movable part of the mast 140 Lift cylinders 144, 146, which have a valve 148 controlled by a hydraulic pressure source become. From the lines to the lifting cylinders 144, 146 branches off a line 150 in the one Pressure meter 152 is arranged.
  • the signal of the Pressure gauge goes to a regulator 154, the other input via a function line 156 is connected to an odometer 158 which measures the adjustment of an inclination cylinder 160.
  • Controller 154 generates a control signal for one Motor 162 that drives a hydraulic pump 164. In this way, depending on the im Lift cylinder 144 or 146 measured pressure Adjustment signal for the tilt cylinder 160 generated.
  • FIG. 13 is a schematically shown Lifting vehicle 170 with a lifting mast holder 172 shown, the one extendable in height Mast 174 holds.
  • the vehicle 170 e.g. two front wheels 176 and a single rear wheel 178.
  • the bearing of wheel 178 is eccentric stored so that by hydraulic actuation of the eccentric 180 with the help of an adjusting cylinder 182 the axis of rotation of the wheel 178 at a distance can be changed to the vehicle.
  • the incline of the vehicle also changes 170 and thus the inclination of the mast 174.
  • the actuation of the tilt cylinder 182 can be done in the same way as with the tilt cylinders of the embodiments described above.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP91114704A 1990-12-05 1991-08-31 Hubgerüst, insbesondere für Hubfahrzeuge Expired - Lifetime EP0489230B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4038730 1990-12-05
DE4038730A DE4038730A1 (de) 1990-12-05 1990-12-05 Hubgeruest, insbesondere fuer hubfahrzeuge

Publications (4)

Publication Number Publication Date
EP0489230A2 EP0489230A2 (de) 1992-06-10
EP0489230A3 EP0489230A3 (en) 1992-11-25
EP0489230B1 EP0489230B1 (de) 1995-06-28
EP0489230B2 true EP0489230B2 (de) 1999-05-26

Family

ID=6419611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91114704A Expired - Lifetime EP0489230B2 (de) 1990-12-05 1991-08-31 Hubgerüst, insbesondere für Hubfahrzeuge

Country Status (2)

Country Link
EP (1) EP0489230B2 (enrdf_load_stackoverflow)
DE (2) DE4038730A1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5211296A (en) * 1991-10-01 1993-05-18 Heygere Philippe N D Device and process for the storage of products
EP0574660B1 (de) * 1992-06-19 1997-05-14 Jungheinrich Aktiengesellschaft Hublader
DE4305639C2 (de) * 1993-02-24 1996-05-30 Jungheinrich Ag Hublader
GB2364992B (en) * 2000-07-24 2004-05-05 Lansing Linde Ltd Lifting structure for an industrial truck
DE102007042878A1 (de) 2007-09-08 2009-03-12 Jungheinrich Aktiengesellschaft Hochhubflurförderzeug
IT1402072B1 (it) * 2010-10-18 2013-08-28 Ceresa Montante per carrello sollevatore precaricato mediante tiranti
DE202012002445U1 (de) 2012-03-06 2013-06-07 Jungheinrich Aktiengesellschaft Flurförderzeug mit optional anwählbarer Ausstapelhilfsbetriebsart

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456320A (en) * 1947-02-24 1948-12-14 Ross Carrier Company Lift truck
US3307656A (en) * 1965-10-22 1967-03-07 Clark Equipment Co Hydraulic system for lift trucks and the like
US4221530A (en) * 1978-06-08 1980-09-09 Williams Iv James M Force-moment compensating apparatus
DE3016156C2 (de) * 1980-04-26 1987-01-29 Jungheinrich Unternehmensverwaltung Kg, 2000 Hamburg Hubgerüst mit wenigstens einem ausfahrbaren Teil und einem Lastträger zur Handhabung der Last
DE3210951C2 (de) * 1982-03-25 1987-01-08 Jungheinrich Unternehmensverwaltung Kg, 2000 Hamburg Stapelfahrzeug mit Hubgerüst
US4458785A (en) * 1982-10-25 1984-07-10 Bushnell Jr Sherman W Lift
GB2163126B (en) * 1984-08-18 1987-07-22 Bamford Excavators Ltd A boom and method of operating it

Also Published As

Publication number Publication date
DE4038730A1 (de) 1992-06-11
DE4038730C2 (enrdf_load_stackoverflow) 1992-09-10
EP0489230B1 (de) 1995-06-28
DE59105861D1 (de) 1995-08-03
EP0489230A2 (de) 1992-06-10
EP0489230A3 (en) 1992-11-25

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