Abstract:
A fluid mass flow based thrusting system for facilitating full penduling actuation of single cable or parallel cables suspended payload especially but not exclusively for aerial tethered/cable suspended robots, rescue systems and crane systems is provided. The required position and orientation of the payload is provided with the use of additional actuators along desired trajectories. Using at least three fluid mass flow generators in the proposed geometrical arrangements enable the full actuation of the nutation, precession and rotation/yaw angles of the pendulum like a suspended payload platform (pp). The roll and pitch of the payload, e.g., and not by way of limitation, is to be set by additional fluid mass flow generators or by using windable orienting cables or gyros.
Abstract:
A method for hoisting an item (14) at sea, in which the item (14) is moved between different height levels by means of a hoisting device (2), and in which the item (14) and at least two hoisting ropes (4, 8) are connected to a first coupling (10), and in which the at least two hoisting ropes (4, 8) are brought to extend substantially parallel along at least part of the distance between the item (14) and hoisting device (2) at least during part of the hoisting operation, one of the at least two hoisting ropes (4, 8) being formed by a first hoisting rope (4) which is connected to the hoisting device (2), and one of the at least two hoisting ropes (4, 8) being formed by a second hoisting rope (8) which is connected, at its upper end portion (24), to a releasable second coupling (18) which is in a load-bearing suspension means (20) on a vessel (1), and the first hoisting rope (4) being released, when the item (14) is to be lowered further, from a first coupling (10) located at a lower height level, as the lifting power is transferred to a second hoisting rope (8), after which the first hoisting rope (4) is connected to the second coupling (18) which is then lifted out of the suspension means (20) and lowered further into the water.
Abstract:
The invention concerns a device for displacing a load (14) comprising a mobile support (12) adapted to support a load and exert on said load a force in a given direction, and means for mechanical balancing (10) interposed between the mobile support (12) and the load (14) so as to compensate the weight of the load and allow movements of slight amplitude of the load in a direction parallel to the load. The device is particularly useful for manoeuvring stakes, such as sheet piles and the like. The balancing means (10) can alternatively be integrated between the mobile support (12) and a vibration generator (46) to isolate said support from the vibrations generated by the vibration generator.
Abstract:
In a crane with a braked hoisting winch a hoisting cable (6) runs over pulleys of which at least one (9) is carried by a working cylinder (10) attached to the bedframe of the crane, and which allows alteration of the distance between the bedframe and pulley. The working cylinder (10) is connected to the brake (12) via a braking force regulator (14). The braking force is reduced when the brake is on when a jerk of a given size occurs on the hoisting cable (6), whereby the jerk stress on the crane can be reduced.
Abstract:
A system [10] includes a spreader bar [12] comprising a structural support, a first load coupling [21], and a second load coupling [22], and a lift coupling [16] and a drive system [26] coupled to the lift coupling [16]. The system also [10] includes at least one load sensor [25] configured to sense a load [15] coupled to the first load coupling [21], the second load coupling [22], or a combination thereof. A controller [28] may be coupled to the drive system [26] and the at least one load sensor [25], such that the controller [28] is configured to obtain an indication of a centre of gravity [13] of the load [15] based on the at least one load sensor [25], and the controller [28] is configured to operate the drive system [26] to move the lift coupling [16] based on the centre of gravity [13].
Abstract:
Method for compensating relative motions of a lifting gear (6) of a lifting device (2) connectable to a load (20), wherein the lifting device comprises a reeving system (3) with at least one hoisting rope (4), comprising, connecting a linkage mechanism (12) of the motion compensation system (10) to the hoisting rope; actuating the linkage mechanism to impart displacement of the hoisting rope in a direction substantially transverse of a rope main loading direction, to impart movement of the lifting gear to compensate relative motion of the lifting gear.
Abstract:
For load compensation, different kinds of elastomeric load compensators are placed at various locations on the crane for increased flexibility and for shock and vibration absorption. The elastomeric load compensators employ elastomeric tension elements, elastomeric torsion elements, or elastomeric shear elements. Elastomeric tension elements can be simply inserted in series with the main hoist rope. An elastomeric load compensator employing elastomeric torsion elements is mounted to the underside of the boom for receiving the live end of the main hoist rope. A single stack of elastomeric shear elements is suitable for mounting a hoist or winch or an idler sheave to the crane structure. For additional load compensation, the hoist, winch, and idler sheaves are mounted on rails for increased displacements under heave loads, and the increased displacements are compensated by elongated elastomeric tension elements or multiple elastomeric tension, torsion or shear elements in series.
Abstract:
A crane comprises a base (1, 2), an articulated jib (3, 4) which is supported by the base, as well as hoisting means (5, 9) which are guided from the base via the jib, such as a hoisting cable. The jib comprises jib parts (3, 4) which are rotatably supported with respect to each other and with respect to the base (1, 2), as well as respective jib part drives (10- 12) for varying the angular position of jib parts with respect to the base or with respect to another jib part. One of the jib part drives has series-connected linear actuators (11, 12), one of which is connected to one of the jib parts and the other of which is connected to a jib part adjoining said jib part and which linear drives cooperate with each other via a guide (13) on the jib.
Abstract:
Die vorliegende Erfindung betrifft Drehvorrichtung sowie ein Verfahren zum Drehen eines an einer Aufhängung aufgehängten Gegenstands. Die Drehvorrichtung ist an der Aufnängung, beispielsweise an einem Kranhaken anbringbar und umfasst zumindest einen Motor (34), dessen Motorwelle im aufgehängten Zustand im Wesentlichen senkrecht ausgerichtet ist und mit dem aufgehängten Gegenstand verbindbar ist, wohingegen wobei das Motorgehäuse des Motors mit einem drehbaren Rotationskörper verbunden ist. Der Rotationskörper (21) ist fest mit einem Energiespeicher (35) verbunden und die Achse (46) der Motorwelle fällt im Wesentlichen mit einer Hauptträgheitsachse des Rotationskörpers zusammen. Um ein möglicht großes Trägheitsmoment des Rotationskörpers zu erhalten ist der Hauptteil der Masse des Energiespeichers (35) in einem Außenbereich bezüglich der radialen Ausdehnung R im Rotationskörper untergebracht.