Crane

Patent metadata

Field	Value
Publication number	US-11084691-B2
Application number	US-201716091995-A
Country	US
Kind code	B2
Filing date	Apr 6, 2017
Priority date	Apr 8, 2016
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

The present invention relates to a tower crane with a load lifting means mounted on a hoisting cable, driving devices for moving several crane elements and traversing the load lifting means, and a control device for controlling the driving devices such that the load lifting means moves along a traversing path between at least two target points. The control device has a traversing path determining module for determining a desired traversing path between the at least two target points and an automatic traversing control module for automatically traversing the load lifting means along the determined traversing path.

First claim

The invention claimed is:

1. A crane comprising:
a load lifting means;
driving devices for moving the load lifting means through a traversing path defined by at least two target points; and
a control device for controlling the driving devices to move the load lifting means along the traversing path;
wherein the control device includes processing to:
determine the traversing path with a traversing path determining module utilizing point-to-point control with an overlooping function; and
in an automatic mode, automatically move the load lifting means along the determined traversing path using an automatic traversing control module; and

wherein the point-to-point control with the overlooping function is configured to operate such that when the load lifting means reaches an overlooping area of a target point, the load lifting means is directed to a next target point just before reaching the target point, wherein overlooping is begun when an axis of the load lifting means reaches a region defined by a sphere around the target point.

2. The crane according to claim 1 , wherein the traversing path determining module includes a path control module for determining a continuous, mathematically defined path between two target points.

3. The crane according to claim 1 , wherein the traversing path determining module is configured to take into account working range limitations, and determine the traversing path around working range limitations.

4. The crane according to claim 1 , wherein the load lifting means is mounted on a hoisting cable; and
wherein the driving devices including several crane elements, one of the crane elements being the load lifting means.

5. The crane according to claim 4 , wherein the control device comprises a position sensor system that is configured to detect the load lifting means relative to a fixed world coordinate system, and/or is configured to position the load lifting means relative to a fixed world coordinate system.

6. The crane according to claim 4 further comprising a sway damping device configured to detect sway of the load lifting means as it is moved through the traversing path;
wherein, in the automatic mode, the automatic traversing control module takes into account detected sway from the sway damping device and the control device controls an actuation of the driving devices to dampen the sway of the load lifting means as it moves along the traversing path.

7. The crane according to claim 6 , wherein the sway damping device includes a detection device for detecting a deflection of the hoisting cable, and/or the load lifting means with respect to a vertical axis through a suspension point of the hoisting cable;
wherein the automatic traversing control module actuates one or more of the driving devices based on the detected deflection and/or a diagonal pull signal of the detection device.

8. The crane according to claim 6 , wherein the sway damping device includes:
a determination means for determining deformations and/or movements of structural components of the crane as a result of dynamic loads; and
a control module configured to take into account the determined deformations and/or movements of the structural components, as determined by the determination means, as a result of dynamic loads influencing the actuation of the one or more driving devices.

9. The crane according to claim 8 , wherein the structural components of the crane comprise a tower and/or a boom; and
wherein the determination means is configured to determine deformations and/or loads of the tower and/or the boom as a result of dynamic loads.

10. The crane according to claim 8 , wherein the structural components of the crane comprise drive train parts; and
wherein the determination means is configured to determine deformations and/or movements of the drive train parts as a result of dynamic loads.

11. The crane according to claim 8 , wherein the determination means includes an estimating device for estimating the deformations and/or movements of the structural components as a result of dynamic loads based on digital data of a data model describing a crane structure.

12. The crane according to claim 8 , wherein the determination means includes a calculation unit for calculating structural deformations and resulting movements of structural components with reference to a stored calculation model, the stored calculation model based on control commands entered at a control stand.

13. The crane according to claim 8 , wherein the determination means includes a sensor system for detecting the deformations and/or movements of the structural components.

14. The crane according to claim 13 , wherein the sensor system includes one or more of:
an inclination sensor for detecting tower inclinations;
an acceleration sensor for detecting tower velocities;
a rotational speed sensor for detecting a rotational speed of a boom;
an acceleration sensor for detecting an acceleration of a boom;
a pitching movement sensor for detecting pitching movements of a boom;
a cable speed sensor for detecting cable speeds of the hoisting cable; or
a cable acceleration sensor for detecting cable accelerations of the hoisting cable.

15. The crane according to claim 8 , wherein the sway damping device includes a filter and/or observer device for influencing actuating variables of drive regulators;
wherein the regulator actuating variables actuate the driving devices;
wherein the filter and/or observer device is configured to receive, as a first set of input variables:
the regulator actuating variables of the drive regulators; and at least one of:
detected and/or estimated movements of crane elements; or
deformations and/or movements of structural components;

wherein the at least one detected and/or estimated movements of crane elements, or deformations and/or movements of structural components, occur as a result of dynamic loads;
wherein the filter and/or observer device is configured to influence the regulator actuating variables based on dynamically induced movements of the crane elements; and
wherein the regulator actuating variables are obtained for particular actuating variables and/or deformations of structural components.

16. The crane according to claim 15 , wherein the filter and/or observer device is configured as a Kalman filter.

17. The crane according to claim 16 , wherein the determination means includes:
an estimating device for estimating the deformations and/or movements of the structural components as a result of dynamic loads based on digital data of a data model describing a crane structure;
a calculation unit for calculating structural deformations and resulting movements of structural components with reference to a stored calculation model, the stored calculation model based on control commands entered at a control stand; and
a sensor system for detecting the deformations and/or movements of the structural components;
wherein the determination means is configured to output as output variables one or more of the estimated deformations and/or movements from the estimating device, the structural deformations and resulting movements of structural components from the calculation unit, and the deformations and/or movements of the structural components from the sensor system;
combining:
the first set of input variables; and
those output variables of the determination means not already included in the first set of input variables to form a second set of input variables;

wherein the filter and/or observer device is configured to receive the second

Assignees

• Liebherr Components Biberach Gmbh

Inventors

• Palberg Michael
• Resch Jürgen
• Fenker Oliver

Classifications

• B66C13/063 Primary

  electrical · CPC title

• B66C13/48 Primary

  Automatic control of crane drives for producing a single or repeated working cycle; Program control · CPC title