WO1998046518A1 - Dispositif de mesure de sollicitation pour machines elevatrices - Google Patents

Dispositif de mesure de sollicitation pour machines elevatrices Download PDF

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Publication number
WO1998046518A1
WO1998046518A1 PCT/EP1998/002051 EP9802051W WO9846518A1 WO 1998046518 A1 WO1998046518 A1 WO 1998046518A1 EP 9802051 W EP9802051 W EP 9802051W WO 9846518 A1 WO9846518 A1 WO 9846518A1
Authority
WO
WIPO (PCT)
Prior art keywords
carriage
work platform
masts
force measuring
measured
Prior art date
Application number
PCT/EP1998/002051
Other languages
German (de)
English (en)
Inventor
Johannes C. F. G. Van Mol
Original Assignee
Hek Manufacturing B.V.
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
Priority claimed from DE19717541A external-priority patent/DE19717541A1/de
Application filed by Hek Manufacturing B.V. filed Critical Hek Manufacturing B.V.
Priority to AU80132/98A priority Critical patent/AU8013298A/en
Publication of WO1998046518A1 publication Critical patent/WO1998046518A1/fr

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
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • 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
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms

Definitions

  • the invention relates to a device for measuring the load in machines with height access, in particular in the case of aerial work platforms, with two masts arranged parallel to one another and a working platform extending between the masts, which is arranged such that it can be moved vertically by means of carriages on the masts, the working platform being arranged at right angles to the longitudinal axis of the masts Supporting structures of the carriages rest.
  • the invention further relates to a method for determining static loads, in particular tensile and compressive forces as well as bending and torsional stresses in a working platform of an elevating work platform which is vertically movable on at least two masts and is connected to the masts by carriages.
  • Such height access machines namely aerial work platforms are known from the prior art. They are usually erected in the area of building facades instead of scaffolding.
  • the work platform of such an aerial work platform usually engages around the masts on at least three sides, it being customary for the work platform to also protrude laterally beyond the two masts.
  • the masts consist of mast elements which are arranged one above the other in shots and bonded to one another, so that masts of the desired height can be created from a large number of mast elements.
  • a drive unit is generally used for power transmission, which is arranged on a motor support plate and has at least one electric motor with a gearbox flanged thereon.
  • the motor support plate is part of the carriage, the transmission having at least one output pinion on the output side, which meshes with a toothed rack attached to the mast.
  • the working platform of such an aerial work platform is used on the one hand in its intended form as a platform for carrying out work in the facade area.
  • the work platform is loaded with, for example, building materials, such as stones, facade elements or the like.
  • the work platform it is common for the work platform to be built up in segments, so that the work platform can be adapted to the building depending on the site conditions. Overhangs of the working platform of different lengths can be provided on both sides of the masts.
  • the object of the invention is to create a device and a method for measuring the load in machines with height access, with which a large number of loads can be statically ascertained in a simple manner, which is used to control the machine with height access can be evaluated and used.
  • a force measuring device is arranged between each support structure and the work platform, which force measuring device is a force measures and transmits the measured value to a computer which calculates a static load on the work platform from the measured values.
  • the forces transmitted from the work platform to the carriage are measured via force measuring devices.
  • the static load on the work platform due to rising loads is determined. Not only can the force acting directly on the carriage be measured, but also a force distribution over the longitudinal extension of the work platform.
  • two force measuring devices are arranged between each carriage and the work platform.
  • This configuration has the advantage that, in addition to the force distribution in the longitudinal extent of the work platform, a force distribution in the horizontal direction perpendicular to the longitudinal extent of the work platform can also be determined.
  • the force measuring devices are preferably arranged at a distance from one another.
  • the force measuring devices are arranged on a line that runs at right angles to the longitudinal extension of the work platform.
  • the force measuring devices are preferably arranged as far apart from one another as possible within the carriage, so that representative force values are thereby achieved which do not or only slightly influence one another.
  • the work platform can be displaced relative to the masts to a limited extent parallel to its longitudinal axis. It has also proven to be advantageous to arrange the work platform in a limited manner so that it can be pivoted relative to the carriage. Through these degrees of freedom, forces are due to a Misalignment of the working platform, which then leads to tensioning of the working platform between the masts, is compensated for when measuring the forces acting on the working platform, so that the forces measured via the force measuring devices essentially relate to the actual force ratios due to the dead weight of the working platform and due to that on the Play the work platform on the load.
  • the force measuring devices are designed in particular as strain gauges. Strain gauges represent an inexpensive option for a force measuring device and can also be used in devices of this type which are handled under rough operating conditions such as those prevailing on construction sites, for example. It should be noted that the necessary care is not always taken when operating machines on construction sites.
  • each carriage In each case one force measuring device of each carriage is arranged on an end of the carriage facing the mast and the second force measuring device of each carriage is arranged on an end of the carriage facing away from the mast and thus opposite the former end.
  • each carriage is arranged on a central axis of the support structure of the carriage which is oriented towards the mast.
  • This configuration also has the advantage that forces due to an inclined position of the working platform relative to the masts are substantially compensated for, since the force measuring devices are arranged on a neutral line of the carriage in this regard.
  • a force is measured by means of force measuring devices at support points of the work platform on the carriage and that the measured forces are transmitted to a computer which checks the forces with regard to the total load on the work platform, the load per carriage and / or any bending and / or torsional stresses in the aerial work platform.
  • the total load on the work platform is calculated from the sum of the individual forces measured via the force measuring device.
  • the load per carriage is calculated from the sum of the forces measured in the respective carriage.
  • the bending stress in the work platform can be calculated from the quotient of the sum of the measured forces in both carriages.
  • the torsional stress in the work platform is calculated in each case from the quotient of the forces measured at two points on a carriage.
  • the computer is preferably connected to drive motors of the carriages.
  • the measured loads are also stored in the computer
  • the reference values can be saved in the computer depending on the design of the work platform.
  • the height access machine is stored in the computer as a reference value with regard to the weight of the work platform.
  • the payload of the work platform that is, the possible transport loads of the work platform, depends on the structural design of the mast construction and the structural design of the drive devices. Taking into account a safety distance, the payload results from the maximum possible transport load minus the dead weight of the work platform. In the same way, of course, certain values for torsion and bending stresses can also be specified within the work platform in order to ensure security against unacceptable loads.
  • Figure 1 shows an aerial work platform in view
  • Figure 2 shows the aerial work platform according to Figure 1 in side view
  • Figure 3 shows a carriage with a schematically illustrated transmission for the aerial work platform according to the figures
  • Figure 4 shows the schematically illustrated carriage according to Figure 3 in plan view; / 46518
  • Figure 5 is a side view of the carriage of the
  • Aerial work platform according to FIG. 1 with the work platform resting on it;
  • Figure 7 is a plan view of the work platform.
  • FIG. 1 shows an aerial work platform 1, which is arranged in front of a building 2.
  • the aerial work platform 1 consists of two masts 3 and 4, which masts 3 and 4 consist of individual mast elements 5 and 6, which are arranged one above the other to form the masts 3 and 4 and are connected to one another.
  • Each mast 3, 4 has a mast foot 7, 8 which stands on a support surface 10 via height-adjustable support feet 9.
  • the mast base 7, 8 can also have a chassis with which the mast 3, 4 can be moved.
  • the mast foot 7, 8 can be raised so far via the support feet 9 that the undercarriage does not stand on the contact surface 10.
  • the masts 3, 4 are connected to the facade of the building 2 by means of guy wires 11.
  • Each mast 3, 4 has a rack 12, 13 which is fastened to the outside of the mast 3, 4, the rack 12, 13 being divided into individual sections, which sections of the rack 12, 13 have essentially the same length, like the individual mast elements 5, 6.
  • a carriage 14, 15 is arranged such that it can be moved along the masts 3, 4.
  • the carriages 14, 15 are connected to one another via a work platform 16. Accordingly, the work platform 16 can be arranged at different heights in front of the building 2 by means of the carriages 14 and 15 in order to carry out corresponding work the facade. For safety reasons, the work platform 16 has an essentially all-round railing 18.
  • the carriage 15 is shown in FIGS. 3 and 4. To simplify the design, the carriage 15 is only shown as a rectangular surface.
  • the carriage 15 consists of a plate designed as a motor support plate 22. On the lower edge of the carriage 15, two axes are arranged, on the free ends of which guide rollers 38 and 39 are rotatably arranged. These guide rollers 38 and 39 run on the outer surfaces of the mast elements 5 and serve to guide the carriage 15 along the mast 4.
  • the plate of the carriage 15 on two further axes rotatably mounted guide rollers 27 and 28. These guide rollers 27 and 28 rest on the rear rack 30 of the rack 13 and roll on the rear rack 30.
  • the toothing 29 of the toothed rack 12 is arranged on the surface of the toothed rack opposite the rear 30 of the toothed rack.
  • the plate of the carriage 15 carries a drive motor 19 which acts indirectly with its motor axis on a pinion 26 which meshes pinion 26 with two output pinions 24 and 25, which in turn mesh with the toothing 29 of the rack 13.
  • the torque of the drive motor 19 is transmitted via the pinion 26 and the output pinions 24 and 25 to the rack 12 arranged in a fixed manner on the masts 3 and 4, so that the carriage 15 along the rack 12 and thus also along the corresponding mast 3, 4th is vertically movable.
  • FIGS. 5 and 6 show the structural design of the work platform 16 and of the carriage 14.
  • the carriage 14 is guided on the mast 3.
  • the carriage 14 has the motor support plate 22, which is aligned parallel to the longitudinal extent of the mast 3.
  • the guide rollers 38 and 39 are arranged such that they roll on both sides of a profile carrier 23 of the mast 3.
  • the gear 31 is screwed to the motor support plate 22 so that the two output pinions 24 and 25 mesh with the rack 12.
  • the carriage 14 has profiles 32 extending at right angles to the mast 3, which are connected to a profile 33 which extends at right angles thereto and are supported against the motor support plate 22 via a further inclined profile 34.
  • bearings 36 are fastened at a distance from one another, with strain gauges 37 being arranged as a force measuring device between the bearings 36 and the support bracket 35. The forces absorbed by the strain gauges 37 are supplied in a manner not shown to a computer which is connected to the drive motors 19 of the aerial work platform 1 via an electrical control.
  • connection element 40 is arranged above each bearing 36 and connects the work platform 16 to the carriage 14.
  • Each connecting element 40 consists of a rod 41 arranged in a fixed position on the work platform 16 and a holder 42 designed as a bearing shell, which is cup-shaped and is covered at its open end with a cover 43.
  • a ball element 44 is mounted in the holder 42.
  • the spherical element has a bore which is penetrated by the rod 41.
  • the rod 41 also passes through two radially arranged openings in the holder 42 and is fixed to the work platform 16 via angle elements.
  • the connecting elements 40 described above enable the working platform 16 to move in the longitudinal direction of the working platform 16 relative to the masts 3 and 4.
  • the connecting elements 40 enable the working platform 16 to rotate relative to the axes of the output pinions 24 the two drives of the carriage 14 and 15 on the masts 3 and 4 compensated so that an uneven lifting movement of the carriage 14 and 15 relative to each other is possible to a limited extent.
  • the arrangement of the connecting elements 40 in combination with the strain gauges 37 can determine the static load on the work platform 16 with regard to the size and location of the load. The forces detected via the strain gauges 37 are evaluated in a computer (not shown in more detail) and are used to switch off the drive motors 19 when a static overload is reached.
  • the openings in the holder 42 are made slightly larger than the diameter of the rod 41.
  • the bore in the spherical element 44 can fit the diameter of the rod 41 agree, since only the necessary axial movement is provided here.
  • the work platform 16 is shown in a top view in FIG. I and II show the positions of the masts. It can be seen that the work platform 16 is divided into different sections in the longitudinal direction and transversely to the longitudinal direction.
  • the points marked with the letters A and B represent the position of the strain gauges 37. By means of these strain gauges in points 1, 2, 3, 4, 11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33 and 34 the loads are measured. In the same way you can also in the area of the mast marked II the individual stress points are measured. This means that the total load on the work platform must be calculated using the following formula:
  • the load per carriage is calculated using the following formula:
  • bending stresses and torsional stresses in the work platform can be calculated using the following formulas, namely the bending stress according to
  • the device described above and the method described above thus enable the measurement of the vertical pressure or tension at each support point with two strain gauges per carriage.
  • the strain gauges are connected to each other via a computer and allow the calculation of all loads within the work platform.

Landscapes

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

Abstract

L'invention concerne un dispositif de mesure de sollicitation pour des machines élévatrices, notamment pour des plateformes de travail élévatrices comportant deux mâts parallèles (3, 4) et une plateforme de travail (16) s'étendant entre les mâts (3, 4). La plateforme de travail (16) est montée de façon à pouvoir se déplacer en hauteur sur les mâts (3, 4) par l'intermédiaire de chariots. La plateforme de travail (16) repose sur des structures de support des chariots (14, 15), placées perpendiculairement à l'axe longitudinal des mâts (3, 4). L'invention vise à créer un dispositif de mesure de sollicitation de ce type pour des machines élévatrices, permettant de déterminer de façon statique une pluralité de sollicitations. A cet effet, entre chaque structure de support (35) des chariots (14, 15) et la plateforme de travail (16) est montée une unité de mesure de force qui transmet la valeur mesurée à un ordinateur calculant une sollicitation statique de la plateforme de travail (16) à partir des valeurs mesurées.
PCT/EP1998/002051 1997-04-11 1998-04-08 Dispositif de mesure de sollicitation pour machines elevatrices WO1998046518A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU80132/98A AU8013298A (en) 1997-04-11 1998-04-08 Device for measuring lifting machine load

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19715177.9 1997-04-11
DE19715177 1997-04-11
DE19717541.4 1997-04-25
DE19717541A DE19717541A1 (de) 1997-04-11 1997-04-25 Vorrichtung zur Belastungsmessung bei höhenzugangstechnischen Maschinen

Publications (1)

Publication Number Publication Date
WO1998046518A1 true WO1998046518A1 (fr) 1998-10-22

Family

ID=26035702

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/002051 WO1998046518A1 (fr) 1997-04-11 1998-04-08 Dispositif de mesure de sollicitation pour machines elevatrices

Country Status (2)

Country Link
AU (1) AU8013298A (fr)
WO (1) WO1998046518A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171033A (en) * 1975-12-11 1979-10-16 Rust Willard J Scaffold device
WO1992012091A1 (fr) * 1991-01-08 1992-07-23 Hek France Plate-forme auto-elevatrice
WO1995022502A1 (fr) * 1994-02-21 1995-08-24 Alimak Ab Dispositif de securite et de surveillance pour systeme de plate-forme de travail

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171033A (en) * 1975-12-11 1979-10-16 Rust Willard J Scaffold device
WO1992012091A1 (fr) * 1991-01-08 1992-07-23 Hek France Plate-forme auto-elevatrice
WO1995022502A1 (fr) * 1994-02-21 1995-08-24 Alimak Ab Dispositif de securite et de surveillance pour systeme de plate-forme de travail

Also Published As

Publication number Publication date
AU8013298A (en) 1998-11-11

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