EP2231499A1 - Dispositif de levage et deplacement d'un objet comprenant une centrale inertielle - Google Patents
Dispositif de levage et deplacement d'un objet comprenant une centrale inertielleInfo
- Publication number
- EP2231499A1 EP2231499A1 EP09706039A EP09706039A EP2231499A1 EP 2231499 A1 EP2231499 A1 EP 2231499A1 EP 09706039 A EP09706039 A EP 09706039A EP 09706039 A EP09706039 A EP 09706039A EP 2231499 A1 EP2231499 A1 EP 2231499A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inertial unit
- link
- obj
- cable
- traction
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/46—Position indicators for suspended loads or for crane elements
Definitions
- the present invention relates to the installation of artificial blocks for constituting shore protection dikes or dikes against the effects of waves.
- It relates more particularly to the underwater control of the position and orientation of the blocks during handling and more particularly at the time of the final removal of said blocks on the structure.
- Coastal shorelines and port areas are generally protected from the effects of waves and waves by structures with a shell that can withstand the extreme conditions of the sea for decades or even centuries.
- the devices are generally made of natural blocks (rockfill) or artificial blocks (concrete blocks), resistant by their mass and / or their shape and / or nesting, said blocks being either simply deposited in bulk when it comes to rough quarry blocks, either arranged in one another according to a predefined laying plan with rules to be respected (case of monolayer shells), or else arranged p seudo-random when it comes to blocks of shapes more mas sive (eg cubic or pdococic blocks and their derivatives).
- the problem posed is to handle, in a controlled, precise and reliable manner, artificial blocks of all shapes, and to position them accurately and in accordance with the laying plans, on the shell of a dike being built. in the submarine zone from the bottom of the sea, to the emerging zone of the said structure, or even on its aerial part.
- the present invention provides a device for lifting and moving an object and comprising a crane, said crane comprising an arrow equipped with a first cable, said lifting cable, comprising at its end a link adapted to support a said obj and which is suspended from it by means of a gripping device, characterized in that said link is equipped with an inertial unit, said inertial unit being fixed on said link, preferably so that the axis said link, when stretched by a said suspended object, or coincides with one of the axes of the reference (Xc, Yc, Zc) related to the inertial unit, said inertial unit being connected to a computer, preferably located in the cabin of the crane operator, to which are transmitted the data, recorded in real time, of longitudinal accelerations of said inertial unit in the three directions of a movable marker (Xc, Yc, Zc) and rotational accelerations ( ⁇ 1, ⁇ 2, ⁇ 3) of said inertial unit relative to the same axes of the movable reference (Xc,
- reference (Xc, Yc, Zc) related to the inertial unit means that said marker is fixed relative to the control unit when it is movable relative to the fixed reference (X, Y, Z).
- An inertial unit is an accelerometer device known to those skilled in the art, able to record in real time its accelerations of longitudinal displacement in the three directions of the space of a movable marker (Xc, Yc, Zc) and the rotational displacement accelerations ( ⁇ 1, ⁇ 2, ⁇ 3) of the same movable marker, with respect to the three axes of a fixed reference (X, Y, Z) of the space.
- said computer first calculates the evolution of the position and trajectory of said inertial unit. And, knowing these position and orientation of the inertial unit, as well as the distance of said inertial unit with respect to the center of gravity of said obj and, this distance being constant since said link remains stretched by said obj and which is suspended to it, the computer can deduce, by a simple geometric calculation, a position and orientation in real time of said object.
- said inertial unit is thus not fixed directly on said object, as is customary in other areas of use of this type of device, for the following reasons:
- the present invention therefore also provides a method of moving and lifting an object with the aid of a device according to the invention, characterized in that said object is moved and in order to put it at a given location. , depending on its position and its angular orientation with respect to the three dimensions of the space (XYZ, ⁇ l - ⁇ 2- ⁇ 3) and, preferably, as a function of the visualization of its movements, as calculated by said computer . More particularly, in the method according to the invention, said obj and is a concrete block and is realized, by lifting, moving and laying blocks, an assembly of blocks in a desired position for the realization of a protection dam of shore or harbor dike resting on the bottom of the sea.
- said inertial unit is fixed on said link at a distance from said block such that said inertial unit is always kept out of water.
- said inertial unit is coupled to a Kalman filter which makes it possible to clip the acceleration amplitudes recorded by the inertial unit, in the event of a large acceleration amplitude of the inertial unit caused by an impact. on said object, and making it possible to substitute, at these amplitudes of accelerations thus clipped (hereinafter parasitic accelerations), the probable values of evolution of the position parameters of said inertial unit, and, preferably, said Kalman filter allowing in addition, to identify the location of said shock and, more preferably, to visualize on the screen the position of the object and during the impact and / or of another said obj and already posed with which said object in progress pose collided.
- parasitic accelerations the probable values of evolution of the position parameters of said inertial unit
- Kalman filters are known to those skilled in the art. Such a filter is a recursive estimator which is used to eliminate "parasitic" movements calculated aberrantly by the computer in view of their appearance in the form of peaks, whereas these movements are not carried out in reality, in particular in case shocks on said obj and, as explained later.
- this Kalman filter is used to further identify the location to which said obj has been shocked, for example by visualizing said obj and by a different color at each shock, in the zone. said shock.
- this last information is very useful for the crane operator, to adjust the position of the block in the final phase of removal of said obj and, in particular a block on a dike, and more particularly in the absence of any visibility of said block by the crane operator or a diver assistance to supervise said final phase.
- said inertial unit is combined with a device for directly measuring the position, in said fixed reference (X, Y, Z), of said inertial unit, said measurement comprising the study of the traj and of a wave emitted by said measuring device, such as a laser sighting device, an automatic theodolite or, preferably, a differential GPS.
- a device for directly measuring the position, in said fixed reference (X, Y, Z), of said inertial unit said measurement comprising the study of the traj and of a wave emitted by said measuring device, such as a laser sighting device, an automatic theodolite or, preferably, a differential GPS.
- This embodiment makes it possible to implement a method in which, advantageously, only the angular acceleration data ( ⁇ 1, ⁇ 2, ⁇ 3) recorded with the aid of said inertial unit are processed within the computer; it being coupled to a Kalman filter, and the longitudinal position in the space of said obj and with respect to said fixed reference (X, Y, Z) being provided by means of an additional device for direct determination of the position longitudinal of said inertial unit by means of wave emission, such as a laser sighting device, an automatic theodolite or, preferably, a differential GPS.
- the realization by the Kalman filter of the clipping of the amplitudes of acceleration caused by shocks on said obj and, is exploited to identify and, preferably, to display on a screen, the occurrence of a shock on said object.
- said link is constituted by the lower part of the hoisting cable.
- said link is independent of the lifting cable and has a greater torsional rigidity than said lifting cable, said link being preferably consisting of a metal chain or a tube or profile made of steel or composite material, said tube or profile having a torsional rigidity and flexural flexibility with respect to its longitudinal direction.
- flexion with respect to the longitudinal direction is used here to mean a bending by which the straight axis of said link at rest adopts a curved shape with respect to said rectilinear axis, when it is stressed in bending.
- This torsional stiffness combined with a flexible flexion with respect to the longitudinal direction of the link, makes it possible to achieve a first greater mechanical filtering parasitic accelerations recorded at the inertial unit due to possible shocks on a said obj and. Moreover, and above all, this torsional stiffness of said link enables the position and orientation of said obj and movements of said object visualized following the calculations of said computer to be more faithful with respect to the real movements of said object and, that is, say are better synchronized with the movements of said inertial unit.
- said link is connected to the lower end of said lifting cable by a ring or hook connection, the upper end of said link cooperating with said hook or connecting ring via a pin.
- pin a ball bearing device, roller, or even smooth bearing type, allowing rotations of said link on itself, without torsion at its connection to said ring or hook connection.
- said inertial unit is integral with said link in the vicinity of said connecting ring or hook between said lifting cables and said link, where appropriate under a said journal connected to the end of said link and cooperating with a said hook or connecting ring;
- said gripping device is integral with the lower end of the link and capable of cooperating with a said object, so that the movements of the said object and in rotation with respect to the axis of the said link are reflected at the said lower end of the link; .
- the center of gravity of said obj and remains in alignment with said link being lifted and moved.
- the gripping device at the lower end of said link is constituted by a plurality of slings arranged in crow's feet, connected to a plurality of lifting rings, integral with said obj and distributed around said obj and such that the center of gravity of said object remains in alignment with said link being lifted and moved.
- said gripping device is constituted by an entirely rigid device, of the type of sugar tongs.
- gripping devices such as sugar tongs or crow's feet, are particularly advantageous so that any rotation of said obj and itself is reflected by a rotation of said link and therefore of said inertial unit, so that the rotational movements of said obj and itself are more accurately retranscribed by the calculations made on the basis of the data recorded from the movements of the inertial unit.
- it implements a crane whose lower end of said boom rests on an arrow support, itself secured to a steering turret, and said boom being inclined in a vertical plane, said boom being adapted to be rotated relative to a vertical axis integral with said boom support.
- the device according to the invention comprises said hoisting cable suspended at the end of said boom, coupled to a second cable, said traction cable, one end of which is connected to a winch, preferably integral. a support platform for said boom, the other end of the pulling cable being integral with the suspension hoisting rope, preferably at a hook or connecting ring at the lower end of said hoisting rope, such that the reduction in length of said pulling cable, by actuation of said pulling winch, makes it possible to incline said lifting cable with respect to the vertical ZZ and to move in translation said obj and, in a vertical plane not passing by said traction cable and said lifting cable, preferably a vertical plane passing through the axis of said arrow (X1 X '1), that is to say when said traction cable is located in the same vertical plane as the axis of said arrow (Xl X'l).
- a said traction cable makes it possible to accurately move the said connecting ring or hook and therefore the said object in translation in a vertical plane comprising the axis of the arrow, and to bring the said object closer to the said traction hoist. without having to change the inclination of the boom and, of course, without having to move the crane, which is prohibited when it is being lifted a heavy obj.
- the device according to the invention comprises at least two traction cables connected, respectively, to two traction winches, one end of each traction cable being connected to a said traction hoist, preferably secured to a support of said boom, the another end of each of the two traction cables being integral with said lifting cable, preferably at its lower end at the level of the same said ring or hook connection (I d), the two traction winches being arranged on either side of said arrow, preferably symmetrically, so that a reduction in length of at least one of said two traction cables makes it possible to move said object laterally with respect to a vertical plane not passing by the axis X 1 X '1 of said arrow, in a plane defined by the two traction cables, preferably a different length reduction for the two cables traction arranged symmetrically with respect
- the two said traction hoists are arranged at both ends of a transverse beam secured to a platform supporting said boom. This makes it possible, in particular, to adjust at the end of the laying the adequacy of the position of a block with respect to the already laid block of a dike in progress.
- the present invention therefore provides a method in which a displacement and lifting device, as defined above, is implemented and the stability and positioning of said object is adjusted and at least one said traction winch is actuated.
- said link is connected at its upper end to a motor bearing, integral with said connecting ring or hook, said motorized bearing for controlling the motorized rotation of said link and said object and in rotation on itself when its motor is actuated, and said motorized bearing j being the role of trunnion when its engine is disengaged.
- This rotation can be controlled by the crane operator and allows to adjust the position of the obj and as needed during its final removal, particularly in the case of a block to be deposited in a particular laying plane on an as the appearance of blocks of a dike in progress.
- said motorized bearing cooperates with a rigid arm, said reaction arm, which makes it possible to take up the torsional forces generated by said motorized bearing in rotation, at the upper part of said motorized bearing secured to said connecting ring or hook, said reaction arm being interposed between the end of a said traction cable and the upper portion of said motor bearing which it is secured.
- the present invention therefore also provides a method in which a device of this type according to the invention is implemented and said motorized bearing is rotated so as to orient the object and, by rotation on itself, in the final phase. of deposit.
- FIG. 1 represents, in section and in side view, the installation of artificial blocks of cubic shape, for producing the shell of an embankment embankment according to the prior art
- FIGS. 2A-2B represent respectively in top view and in side view, a cube-shaped block
- FIGS. 3A-3B show a side view of a "gripper” type gripping device for adjusting the orientation angle of said block relative to the vertical
- FIG. 4 shows in side view the laying of artificial blocks of cubic shape using the lifting device according to the invention
- FIG. 4A represents the cartesian orthogonal coordinate system linked to the inertial unit with respect to the fixed reference Cartesian reference frame XYZ,
- FIG. 4B represents the Cartesian orthogonal coordinate system Xc-Yc-Zc relating to the oblique position of the inertial unit with reference to FIG. 4;
- FIG. 5 is a view relating to Figure 4 shown in view of sus, in which the positioning of the hook is provided by two traction cables connected to two traction winches, the latter being either integral with the structure of the crane installed on fixed supports in relation to the ground,
- FIG. 5A represents a view from above of the lateral and longitudinal displacements of the connecting hook acting along the length of the traction cables connected to the traction hoists
- FIG. 5B shows an inertial unit 6 mounted on a rigid link 8a, consisting of a profiled tube of steel or rigid material, and connected to the lower end of the hoist cable and a traction cable 9a-9b via a pin 29,
- FIGS. 6A-6B illustrate the operating mode of a Kalman filter
- FIG. 7 is the logic diagram of the operation of a Kalman filter in the particular case of laying blocks according to the invention.
- FIGS. 8A and 8C are side views of a rigid link constituted by a tube or section made of steel or rigid material 8a (FIG. 8A) or by a steel chain 8b (FIG. 8C), cooperating with the connection point ends of the traction cables 9 and lifting cable 1a through a motor bearing 30 cooperating with a reaction bar 32,
- FIG. 8B is a top view of Figures 8A and 8C.
- a crane 1 installed on the embankment 2a closer to the sea 3 handles a block 4 suspended by a clamp 5 to the main cable of said crane, said lifting cable, to make the shell of a fill 2c according to a predetermined profile corresponding substantially to the curve 2d.
- the crane comprises a support platform 14 which supports a cockpit 13 and an arrow Ib which rests on the platform 14 by its lower end.
- the arrow I b is in an inclined position relative to the vertical, this inclination being variable and adjustable, in particular by means of an arrow support cable I c connected to a lifting winch 18 supported by said platform 14.
- the support platform 14 is able to be displaced in rotation about a vertical axis ZZ with respect to its displacement means on which it rests, such as tracks 19, thus rotating the boom and the cabin of the crane around a vertical axis.
- the orientation of the arrow I b in the vertical plane can be adjusted so that the block 4 can be positioned vertically to its destination and then lowered by unscrewing the cable. to be deposited at the desired location on the already assembled work. This procedure works properly when the sea is calm and the work can be controlled by divers.
- the work when a large chop or an offshore swell 3a is established over a long period, the work must be interrupted because, under the effect of said swell, the suspended block is urged and oscillates for several meters. in all directions, and more or less randomly.
- the swell breaks or creates a major agitation suspending particles of sand or aggregates, or creating micro-bubbles and foam, which make the visibility almost zero, thus preventing any intervention by the divers.
- FIGS. 2A-2B show respectively in plan view and in side view an artificial block 4 of known shape, substantially cubic having on its lateral faces median recesses, under form of substantially cylindrical grooves semicircular section.
- These recesses or grooves 4a have the advantage of facilitating gripping, increase the interblock reactions and the "porosity" of a semblance of blocks.
- the dissipated energy is considerably increased by this porosity and the attenuation effect is thus reinforced.
- the storage of the blocks during manufacture and supply which requires a very orderly arrangement so as to occupy as little space as possible, as shown in FIG.
- FIGS. 3A-3B a front view is shown of a known gripping device 5a of the "sugar tong" type in the form of a half circle, which makes it possible to grasp the block either vertically (FIG. 3A) or with a angle ⁇ relative to the vertical ( Figure 3B).
- the gripping device is constituted by a crowbar slings 5b having at least three strands attached to the lifting rings 5c incorporated in precise positions of the block before pouring concrete.
- This gripping device 5b makes it possible to maintain the center of gravity of the block in the alignment axis of the link 8, on the one hand, and, on the other hand, favors the synchronization of the rotations of said block and said link with respect to the axis Zc ( axis of said link 8).
- FIG 4 there is shown in side view the device according to the invention consists of a ring or connecting hook I d located at the end of the hoist cable l a.
- the connecting hook I d is connected to the upper end of a link consisting of a sling 8, preferably via a pin, its lower end being connected to a crowbar 5b connected to the lifting rings 5c integral with the block 4.
- an inertial unit 6 is installed, the function of which is to record in real time the accelerations of longitudinal displacement along the Xc-Yc-Zc axes, as well as the rotational accelerations ⁇ i - ⁇ 2 - ⁇ 3 around the same axes.
- the Cartesian coordinate system corresponding to said axes is a relative reference to the actual support of the inertial unit, as shown in FIG. 4A, the Zc axis corresponding to the longitudinal axis of the link 8.
- the said axis Zc corresponds with the Z axis of the fixed marker, the Xc-Yc axes having an angular offset ⁇ with respect to the XY axes of the fixed marker.
- the longitudinal accelerations according to Xc-Yc-Zc and angular according to ⁇ i - ⁇ 2 - ⁇ 3 are recorded in real time within the inertial unit and transmitted to a computer, preferably located in the crane operator's cabin. This allows, by a double integration with respect to time, to calculate the exact trajectory of said inertial unit, as well as its orientation, and thus the direction of the link 8, since the orientation of the link 8 is constant with respect to the orientation. of the inertial unit.
- block 40 is entered on the storage area of FIG. 5, said block being in the known position XO-YO-ZO, then
- the link 8 is stretched by acting on the lifting cable 1 a, the said link is then vertical and the Cartesian marks relating to the inertial unit and the absolute reference point have the Z axis in common as detailed in FIG. 4A, then,
- the inertial unit is triggered which then records all the movements of said central unit, then
- the position of the block is calculated in real time, and the final approach by the crane operator, before removal, is performed, even in the absence of visibility or in the absence of any control by divers, thanks to said calculated XYZ position of the block, the movements of the block as well as the state of the work already performed being displayed on a screen in the cabin crane operator, and
- the gripping device is disconnected, preferably automatically by a release device, not shown, controlled from the crane operator's cabin;
- the crane is then free to go to grab the next block on the storage area.
- FIG 4 there is shown a traction cable 9 connected at its right end to the ring I d and at its left end to a traction winch 10 secured to the turret 13 of the crane.
- the length ⁇ of said pull cable is reduced, for bring the ring or connecting hook I d towards the vertical of the point of deposit, which has the advantageous effects of drastically limiting the oscillations of the block in the XoZ plane.
- this maneuver is much faster than straightening the arrow I b of the crane by acting on the cables I c, to come to position its end to the vertical of said point of removal.
- the point C of the triangle moves upwards in the figure by describing a circular arc 12 centered at A.
- the ring or connecting hook is advantageously positioned accurately at any point on the surface 1 1, while preventing the rocking movements of said ring in the two directions XX-YY.
- Compact devices are commercially available, including an inertial unit equipped with a gyroscope and accelerometer for measuring movements, the orientation and position of an object and which it is secured. It will be possible to use a device marketed by XSens Technologies B. V. (the Netherlands).
- These devices generally comprise a metal support on which is fixed the inertial unit itself. This support will be attached to the link.
- an inertial unit is known to those skilled in the art, but its operation in the context of the invention is very particular. Indeed, in the final phase of the approach, just before the removal of the block on the structure, the block comes in contact with the adjacent blocks in general before moving into its final position. These shocks induce sudden variations in speed, and therefore significant accelerations, which disturb the inertial unit, which is then no longer able to provide a precise and reliable calculated positioning, which creates an unacceptable shift in the calculated position of the block with respect to its real position.
- the Kalman filter is a recursive estimator. This means that to estimate the current state of a system, only the previous state and the current measurements are needed to estimate the future position with optimal accuracy.
- the acceleration, angular or longitudinal has a series of peaks 15 during a lapse of time s ⁇ t.
- the block has hardly moved, but the mathematical calculation consisting of the double integration of accelerations on each of the axes over this period ⁇ t, generally leads to aberrant calculated movements, because not performed in reality.
- the Kalman filter detects these parasitic accelerations by simple analysis in real time of the previous step of the movement, the filter insulates them by clipping said accelerations 16a-16b, and thus does not take them into account in the mathematical calculation of the instantaneous position.
- the Kalman filter is able, by analyzing the previous steps, to predict the movements during this short period ⁇ t and thus to substitute for these parasitic accelerations, the probable evolution of the system, as represented in FIG. 6B, leading thus to a better reliability in the calculation of the instantaneous position.
- the longitudinal acceleration peaks are observed to signal to the crane shocks blocks with adjacent blocks or those of the lower layer, but the accelerations themselves are not directly taken into account in the calculation of the position.
- the XYZ position in real time of the inertial unit 6 then knowing the evolution in real time of the angular accelerations ⁇ i - ⁇ 2 - ⁇ 3 of said power plant, we deduce the direction of the link 8, and knowing the distance from the center of gravity of the block to said central inertial which is a constant length L, we calculate the exact position of the center of gravity of the block.
- the inertial unit is provided with a DGPS satellite positioning system.
- This system known to those skilled in the art, is a differential system, that is to say, a beacon is installed on the inertial unit and a second beacon is installed on the ground at a fixed point.
- FIG. 7 shows a first global mode of operation of the positioning system, in which the 6 main raw parameters (longitudinal accelerations Xc-Yc-Zc and angular accelerations ⁇ l - ⁇ 2- ⁇ 3) are transmitted. from the inertial unit 6 to the computer, preferably located in the cabin 13 of the crane operator. The data is then processed within the computer 20 by the Kalman filter 20a and the position 21 of the block 4 is established based on all or part of these 6 filtered parameters.
- the 6 main raw parameters longitudinal accelerations Xc-Yc-Zc and angular accelerations ⁇ l - ⁇ 2- ⁇ 3
- the crane operator knows the type of shock and its amplitude, is able to judge the type of contact between the block being installed and the work already done, and so determine in the absence of any visual contact, or any information from divers, the adequacy of the position of the block relative to the laying plane, so its correct installation .
- FIG. 7 there is shown a second preferred overall mode of operation of the positioning system, in which the 6 main parameters in the raw state (longitudinal accelerations Xc-Yc-Zc and angular accelerations ⁇ l - ⁇ 2- ⁇ 3) are transmitted from the inertial unit 6 to the computer preferably located in the cabin crane operator. Only the angular accelerating data ⁇ l - ⁇ 2- ⁇ 3 then processed within the computer 20 by the Kalman filter 20a, the position in the space of said inertial unit 6 being provided by a remote measurement means 7a.
- the link 8a consists of a bar, preferably rectilinear, resistant to torsion, and rigidly secured to the gripping tool, so that the orientation of the integral inertial unit of the link 8a has the same orientation along the Zc axis as the block 4.
- Said link 8a is connected to the connecting ring I d via a motorized bearing 30, electrical, hydraulic or pneumatic, supplied with energy by means not shown, j or the role of trunnion when the engine is disengaged.
- a rigid arm acting as a reaction arm 32, integral with the upper part 30a of the engine, is connected to a traction cable 9b under tension.
- the lower part 30b of the engine is rigidly connected to said link 8a.
- the lower part 30b of the motorization drives the inertial unit 6 and the block 4, the angular displacements being substantially identical due to the torsional rigidity along the ZZ axis of said link 8a.
- the reaction arm counterbalances the effects of torsion at the upper part 30a of the engine. Indeed, as shown in FIG. 8B, a torsion torque M applied to the upper part 30a of the motorization induces a rotation 32a of the reaction arm 32.
- the device according to the invention is represented with two traction cables 9a-9b, only the traction cable 9b is connected to the reaction arm, the cable 9a being connected directly or to the ring or hook I d, either at the upper part 30a of the motor, in the immediate vicinity of its axis of rotation.
- the reaction arm 32 is connected directly to said cable.
- the motorization is removed, and the link 8a having a torsional stiffness along the axis Zc, is on the one hand suspended from the ring or hook I d, and from secondly rigidly connected to the reaction arm 32.
- the position of the gripping tool is preferably adjusted so that once the crane is in position in the drop zone, the block has the right orientation, since the crane operator then more means to vary this angular positioning along the vertical axis Zc.
- FIG. 8C shows an advantageous embodiment of the link 8 having torsional rigidity, which is in the form of a chain 8b. Indeed, in the absence of tension in the chain, it is possible to turn it on its axis ZZ with little effort, but when we apply a significant tension, each link being connected perpendicular to the next and the diameter of the wire of each of the rings being slightly less than the free internal diameter of the ring adj acent, the chain will naturally tend to reposition in a configuration of zero torsion, so perpendicular to the adjoining link, as detailed in the figure 8C.
- the link 8, 8a-8b with torsional stiffness along the axis ZZ can be obtained from a simple steel tube, or else from a profile made of composite material, which has good torsional stiffness, while keeping a large flexible bending in the XoZ and YoZ planes, which advantageously allows a first mechanical filtering of the shocks on the blocks, thus avoiding passing directly to the inertial unit all the parasitic accelerations due to shocks.
- the hoisting rope is continuous up to the gripping device 5, the hook or the ring then being replaced by a mechanical cable clamp from gripping said hoisting rope at a fixed point on which the end of the traction cable or cables is connected, the part above the cable tie then serving as the hoisting cable and the part underneath said cable tie acting as the link 8.
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
- Control And Safety Of Cranes (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Paper (AREA)
- Forklifts And Lifting Vehicles (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0850489A FR2926804B1 (fr) | 2008-01-25 | 2008-01-25 | Dispositif de levage et deplacement d'un objet comprenant la mise en oeuvre d'une centrale inertielle |
| PCT/FR2009/050074 WO2009095577A1 (fr) | 2008-01-25 | 2009-01-20 | Dispositif de levage et deplacement d'un objet comprenant une centrale inertielle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2231499A1 true EP2231499A1 (fr) | 2010-09-29 |
| EP2231499B1 EP2231499B1 (fr) | 2011-11-09 |
Family
ID=39735116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09706039A Not-in-force EP2231499B1 (fr) | 2008-01-25 | 2009-01-20 | Dispositif de levage et deplacement d'un objet comprenant une centrale inertielle |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2231499B1 (fr) |
| AT (1) | ATE532740T1 (fr) |
| BR (1) | BRPI0907390A2 (fr) |
| FR (1) | FR2926804B1 (fr) |
| MA (1) | MA31990B1 (fr) |
| WO (1) | WO2009095577A1 (fr) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8405721B2 (en) | 2008-10-21 | 2013-03-26 | Motion Metrics International Corp. | Method, system and apparatus for monitoring loading of a payload into a load carrying container |
| DK177006B1 (en) | 2010-01-19 | 2010-11-22 | Ah Ind Projects Aps | Method for controlling orientation of a load suspended in a carrier wire around the wire as well as a player arrangement |
| US8843279B2 (en) | 2011-06-06 | 2014-09-23 | Motion Metrics International Corp. | Method and apparatus for determining a spatial positioning of loading equipment |
| WO2015165463A1 (fr) | 2014-04-28 | 2015-11-05 | Liftra Ip Aps | Procédé et dispositif de commande automatique de la position d'une charge suspendue à un câble principal sur une grue |
| US11041720B2 (en) * | 2016-12-13 | 2021-06-22 | Pgs Geophysical As | Calibration of a magnetometer in a towed object telemetry unit based on turn data |
| CN113152386B (zh) * | 2021-02-04 | 2023-03-21 | 南昌工学院 | 湿法堆存尾矿库缆式起重机分级筑坝系统 |
| CN117449596B (zh) * | 2023-11-30 | 2026-01-06 | 中国水利水电第三工程局有限公司 | 一种水电站大坝外侧安装钢结构电梯井道的施工方法 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA662030A (en) * | 1963-04-23 | Mansaver Industries | Motor actuated rotary crane hook | |
| US1481234A (en) * | 1922-01-14 | 1924-01-15 | Bergen Point Iron Works | Digging apparatus |
| US4171053A (en) * | 1977-08-24 | 1979-10-16 | Cecce Robert F | Antipendulation crane |
| DE4238795A1 (en) * | 1992-11-17 | 1993-07-01 | Edgar Von Dipl Ing Hinueber | Damping pendulum movement of hanging loads on crane - using microprocessor to control crane movement and load cable length using sensor input of cable angular velocity and acceleration |
| FR2704847A1 (fr) * | 1993-05-05 | 1994-11-10 | Bertin & Cie | Procédé et dispositif de limitation du ballant d'une charge suspendue à un support motorisé. |
| US7289875B2 (en) * | 2003-11-14 | 2007-10-30 | Siemens Technology-To-Business Center Llc | Systems and methods for sway control |
-
2008
- 2008-01-25 FR FR0850489A patent/FR2926804B1/fr not_active Expired - Fee Related
-
2009
- 2009-01-20 AT AT09706039T patent/ATE532740T1/de active
- 2009-01-20 BR BRPI0907390-6A patent/BRPI0907390A2/pt not_active Application Discontinuation
- 2009-01-20 EP EP09706039A patent/EP2231499B1/fr not_active Not-in-force
- 2009-01-20 WO PCT/FR2009/050074 patent/WO2009095577A1/fr not_active Ceased
-
2010
- 2010-07-01 MA MA32975A patent/MA31990B1/fr unknown
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009095577A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009095577A1 (fr) | 2009-08-06 |
| FR2926804B1 (fr) | 2010-03-26 |
| EP2231499B1 (fr) | 2011-11-09 |
| ATE532740T1 (de) | 2011-11-15 |
| BRPI0907390A2 (pt) | 2015-07-21 |
| FR2926804A1 (fr) | 2009-07-31 |
| MA31990B1 (fr) | 2011-01-03 |
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