Abstract:
The present invention relates to a vessel comprising: -a hull, -a support structure connected to said hull, the support structure configured for supporting the mass, the support structure being constructed to allow the mass to make a back and forth movement relative to said hull along a trajectory between opposite ends of said trajectory, -a damping device configured to dampen the movement of the mass relative to said hull. The present invention also relates to a method for damping the movements of a vessel or of a mass.
Abstract:
The invention relates to a tensioning element for setting braking force in a swing damper, wherein the tensioning element (100) is mounted centrally on a swing joint (B) in order to exert force on a brake arrangement (50) so as to result in swing damping. The tensioning element (100) includes a pin (110) serving for the suspension of an accessory (4) to be subjected to swing damping, a sleeve (130) displaceable along a shoulder (111) on the pin (110) in order to activate the brake arrangement (50), an adjusting screw (140) designed to exert axial displacement force on the sleeve (130) via a spring assembly (143), a nut (160) for adjusting the tightening force of the adjusting screw (140) and a locking element (170) which eliminates rotational movement of the screw (140) relative to the pin (110).
Abstract:
A cable attachment assembly, a hoist and a transportation system using the cable attachment assembly. The cable attachment assembly including: a plate pivotable about a first axis (130) ; first and second pivot assemblies pivotable about respective second and third axes, the first, second and third axes parallel to each other; a first cable retainer (260) in the first pivot assembly, the first cable retainer- adapted to rotatably retain an end of a first cable in the first cable pivot assembly, the first cable rotatable about a fourth axis; a second cable retainer in the second pivot assembly, the second cable retainer adapted to rotatably retain an end of a second cable in the second pivot assembly, the second cable rotatable about a fifth axis; wherein the fourth and fifth axes parallel to each other and the fourth and fifth axes are perpendicular to the first, second and third axis.
Abstract:
En grúas porta contenedores se presenta el siguiente problema: cuando el carro se mueve, los cables que suspenden el spreader-carga oscilan en sentido longitudinal a la marcha. Los sistemas usados para reducir este balanceo presentan dos inconvenientes: • Muchos elementos en la transmisión de potencia, esto conlleva problemas en el mantenimiento. • Las dos funciones principales se realizan por separado: transmitir el movimiento y reducir la oscilación. Se presenta una solución a estos problemas con un accionamiento, autónomo e independiente, mediante motores hidráulicos, consiguiendo que la cadena cinemática de transmisión de potencia sea simple, robusta, fiable y de fácil mantenimiento. Además, los motores realizan simultáneamente las dos funciones principales: producir el movimiento y reducir las oscilaciones. Mediante unos dispositivos de limitación de presión, se amortiguan las puntas de presión que soportan los motores durante el balanceo. El sistema equilibra la presión de los motores y con ello neutraliza el movimiento oscilatorio.
Abstract:
A hoisting crane has a substantially hollow vertical column with a foot which is or can be fixed to a support, and with a top. Furthermore, the hoisting crane has a jib with an associated annular bearing structure which extends around the vertical column and guides and carries a jib connection member, so that the jib connection member can rotate about the column, the jib connection member forming a substantially horizontal pivot axis so that the jib can be pivoted up and down. Furthermore, the hoisting crane has a winch and an associated hoisting cable for hoisting a load. At the top of the vertical column there is a top cable guide, and furthermore there is a hoisting cable guide on the jib of the hoisting crane. The winch is disposed in or in the vicinity of the foot of the vertical column, so that the hoisting cable extends from the winch through the hollow vertical column to the top cable guide and then to the hoisting cable guide on the jib. The top cable guide comprises a rotary bearing structure, so that the top cable guide can follow rotary movements of the jib about the vertical column and adopt substantially the same angular position as the jib. The winch is arranged on a movable winch support, which is mounted movably with respect to the vertical column, the winch support having an associated drive motor assembly for moving the winch support, in such a manner than the winch support maintains a fixed orientation with respect to the top cable guide in the event of rotary movements of the jib about the vertical column.
Abstract:
Damping device (5) for a hydraulic system of a working machine, for damping pressure oscillations in the hydraulic system including a hydraulic cylinder (1), said damping device having a first accumulator (6), having a first preloading pressure P1, and a second accumulator (7), having a second preloading pressure P2, wherein P1 A2. The invention also relates to a hydraulic system including such a damping device.
Abstract:
The invention relates to a crane which is arranged through its reeving system to manoeuvre a load. The crane comprises an upper support structure, a lower support structure arrranged to carry a load and six reeving cables suspending the lower support structure from the upper support structure. There are incorporated means for changing the effective length between the upper and lower support structure of selective ones of the reeving cables. The reeving cables are arranged such that they are connected geometrically to the upper and lower support structures at apexes of an upper and a lower trapezium, respectively, the reeving cables being arranged such that the cables of a first pair of the reeving cables converge in a downward direction, the cables of a second pair of the reeving cables converge in an upward direction and the cables of the third pair of reeving cables extend between opposite ends of the first and second pair reeving cables at the upper and lower support structures. A crane with such reeving arrangement enables adjustment of the position and attitude of the lower support structure with respect to the upper support structure by manipulating the length in individual reeving cables. The reeving cable arrangement results in "stiffness" being present in the connection between the upper and lower support structures when all cables are in tension.
Abstract:
A method and apparatus for controlling a loading element (3) suspended from lifting drums (8, 9) of a crane (1) by lifting ropes (4-7), and a load (2) attached to said loading element (3), said controlling referring to damping horizontal (X, X', Z, Z') sway and skew of the loading element (3) and precision positioning the same in the horizontal direction and in the direction of skew (CW, CCW) by the use of a control apparatus comprising control mechanisms (19-22) mounted in the crane and provided with motors (25), and four auxiliary ropes (26-29) between the control mechanisms and the loading element (3), said method comprising controlling the loading element (3) by moving the auxiliary ropes by means of the control mechanisms. The control is implemented by four identical mechanisms (19-22) provided with rope drums (23), devices (34) for weighing the rope force and/or tachometers (35) and motor control devices (36), each of said four mechanisms being connected to one auxiliary rope (26-29), and four identical control logic circuits (C) connected to each mechanism for controlling by motors (25) the forces (F) exerted on the auxiliary ropes to prevent the loading element (3) from swaying.
Abstract:
The invention relates to a transfer device for large containers (20), e.g. swap bodies, semi-trailers, etc., with a crab (12, 22, 30, 31, 40, 41) movable on a crane or gantry to which a load carrier (17) can be secured via a lifting device (19, 23) so that it can be raised and lowered. To be able to guide and arrange the load carrier (17) more accurately in relation to the large container (20), two horizontally movable columns (10, 11) or lifting frames (110, 111) arranged side by side at a fixed or fixable distance apart are secured to the load carrier (17) which can be moved vertically. Each of the columns (10, 11) or lifting frames (110, 111) can advantageously be connected to the load carrier via a pendulum suspension.