A crane controller for a crane includes: a sliding position sensor for sensing a sliding position of a crane sliding arm, and a memory for storing entries for limit values for an operating parameter of the crane characteristic of the instantaneous crane load. Entries for maximum permissible limit values are stored in the memory for at least two sliding positions of the crane sliding arm. The crane controller also has an overload monitoring means, and a limit value for at least one operating parameter of the crane can be specified by the overload monitoring means of the crane controller. The limit value is specified by the overload monitoring means based on the stored entries according to the sliding position of the crane sliding arm. A limit value between the stored entries with respect to magnitude can be specified for a further sliding position between the stored sliding positions of the crane sliding arm.

A tower crane under safety management and control includes a cargo boom, a spool and a pulley located on the cargo boom, a motor coupled to the spool, a hook, a 3D camera module, and a controller coupled to the 3D camera module and the motor. A tow rope of the spool rolls around the pulley and connects the hook. The 3D camera module includes a first camera facing the hook and a second camera back to the hook. The first and second cameras respectively take images, in real time. The controller obtains the images taken by the first camera when lifting a load downwards, obtains the images taken by the second camera when lifting the load upwards, detects whether there are obstacles within the images; and controls the motor reducing working speed or stopping working when there is an obstacle within the images.

There is provided a crane including a front member capable of derricking, a backstop disposed on a rear surface side of the front member so as to limit a standing operation of the front member, an angle sensor that detects an angle of the front member, an operation detection unit that detects whether or not the backstop is operated, and a controller that controls a derricking operation of the front member. In a case where the controller determines that the angle of the front member is equal to or larger than a predetermined angle, based on a detection signal output from the angle sensor, and determines that the backstop is not operated, based on a detection signal output from the operation detection unit, the controller stops the standing operation of the front member.

The present invention relates to a crane having a boom at which at least one load receiving means is arranged in a raisable and lowerable manner, wherein an overload protection device has detection means for detecting the outreach and the load on the at least one load receiving means, and wherein a monitoring device for monitoring the overload protection device is provided and has determination means for determining a tensioning force holding the boom and/or induced in a guy cable. The invention furthermore also relates to a method for monitoring the overload protection device of such a crane. Provision is made in accordance with the invention that the monitoring device determines online in crane operation a tensioning torque from the continuously determined tensioning force, determines a lifting torque from the continuously detected outreach and the continuously detected load, determines a dead torque while making use of stored crane data, compares the sum of the named lifting torque and the named dead torque with the named tensioning torque and then, if a difference found in the comparison exceeds a tolerance threshold, emits an error signal and/or shutdown signal.

The present application relates to the field of lifting equipment, in particular to a crane and a control method thereof. The crane includes: a body including a chassis and a turntable being rotatably arranged on the chassis; a super-lift device including a super-lift jib, a suspension pulling member and a balancing mechanism, the balancing mechanism including a super-lift counterweight and a pushing device, first ends of the super-lift jib and the pushing device being both connected to the turntable, the suspension pulling member being connected to a second end of the super-lift jib and the super-lift counterweight, a second end of the pushing device being connected to the super-lift counterweight to adjusting a distance between the super-lift counterweight and a slewing center of the turntable; and a hovering device configured to support the super-lift counterweight above a ground when the crane is under no load, a first end of the hovering device being connected to the turntable and a second end of the hovering device being not connected to the super-lift jib. Based on this, the function of slewing and traveling of the crane under no load while carrying the super-lift counterweight is achieved more conveniently.

A method is provided for controlling an operation of a mobile crane, the operation comprising a user input, the user input comprising a command to change a configuration of the mobile crane. The method comprises the steps of: determining a current tipping moment of the mobile crane, the tipping moment comprising a moment about a tipping line of the mobile crane; predicting an effect of the user input on the tipping moment of the mobile crane; and if the predicted effect of the user input is to increase the tipping moment of the mobile crane past a predetermined amount, altering a response to the user input. A system for controlling an operation of a mobile crane, and a user display system for a mobile crane are also provided.

A safety system (2) for a working vehicle (4) comprising a working equipment (6), e.g. a crane or a working tool, the safety system (2) comprises a control unit (8), a controller (10), e.g. a remote controller, configured to control said working equipment (6), and a display unit (12). The control unit is configured to: define a set of three-dimensional safety spaces (14) in relation to the vehicle (4), present at least one safety space (14) from said set of safety spaces on said display unit (12), wherein said at least one safety space being presented overlaid on an image (18) of at least a part of the working vehicle (4) and working equipment (6), receive a first input signal (20) comprising space position parameters representing at least one chosen safety space among the presented safety spaces, and to designate each at least one chosen safety space as an active safety space (14A), and to receive a second input signal (22) comprising a safety space state command either allowing or preventing said working equipment to be moved into said at least one active safety space (14A), and to apply a state command signal (24) to said controller (10) to control said working equipment (6) in dependence of said safety space state command.

A mobile large manipulator includes a chassis, unfoldable and/or extendable working boom, supporting struts, vertically extendable supporting legs, and a micro-controller-based program-controlled supporting aid. The unfoldable and/or extendable working boom is arranged rotatably around a vertical axis on the chassis. The supporting struts are respectively arranged on the chassis and are horizontally extendable from a travel position to a supporting position. The vertically extendable supporting legs are arranged on respective outer ends of the supporting struts. The supporting legs support the mobile large manipulator via respective supporting forces of the supporting legs. The supporting aid is configured to determine supporting forces for the respective supporting legs based, at least in part, on the supporting position of the supporting struts in which the chassis of the large manipulator is deployed unstressed in a support state.

An output-torque estimation unit obtains a value of a current input to a motor, from a power converter, and calculates an estimated output torque value which is an estimated value of output torque of the motor, from the obtained value of the current. A load estimation unit estimates a load value of a hanging cargo based on the estimated output torque value which is calculated by the output-torque estimation unit, a speed reduction ratio of a speed reducer, an effective radius of a winch drum, and the winding number which is set by the number setting unit.

An apparatus for providing a user with a lifting capacity of a lifting machine includes a graphical display displaying a spectrum of lifting capacity across a continuous range of boom height and boom radii. Related methods are disclosed.