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DE-102025145556-A1 - Energy supply for crane systems

DE102025145556A1DE 102025145556 A1DE102025145556 A1DE 102025145556A1DE-102025145556-A1

Abstract

The invention relates to a power supply for crane systems wherein, in order to transmit larger powers at or in front of a rope length sensor (21), the voltage is transformed up in a first converter (23) and at the end of the cable (20), at or near the tip (6) of the crane (1), is transformed back down for the consumers in a second converter (22).

Inventors

  • Zivorad Golubovic
  • Martin Weis

Assignees

  • WIKA ALEXANDER WIEGAND SE & CO. KG

Dates

Publication Date
20260513
Application Date
20251105
Priority Date
20241108

Claims (15)

  1. Power supply for crane systems, comprising a mobile crane (1) with a chassis (2) on which a telescopic boom (3) is mounted, over which a lifting rope (4) is guided, which can be wound up at a first rope end in a drum (5), wherein the lifting rope (4) is guided over a tip (6) of the boom (3) and is provided at a second rope end with a hook (7) with which loads (8) can be lifted, wherein at least one consumer is attached to or near the tip (6) of the boom (3), in particular a lamp, a winch and/or a drive (12), and wherein a cable (20) is guided along the boom (3) for the power supply of the at least one consumer, which can be wound up in a rope length sensor (21), characterized in that for the transmission of electrical power an electrical voltage can be transformed to a first voltage value in a first converter (23) at or before the rope length sensor (21), and that the electrical voltage at the end of the cable (20), at or near the tip (6) of the boom (3), can be transformed to a second voltage value in a second converter (22) to supply voltage to the consumer, wherein the first voltage value is higher than the second voltage value.
  2. Energy supply for crane systems according to Claim 1 , where the first voltage value corresponds to a multiple, in particular a double, of the second voltage value.
  3. Energy supply for crane systems according to Claim 1 or 2 , wherein the first and/or second converter (23, 22) is a DCDC converter and provides an electrical current of 30 A, 60 A or 80 A.
  4. Power supply for crane systems according to one of the preceding claims, wherein the cable (20) comprises at least two electrically insulated conductors, wherein the conductors each have a cross-sectional area of 0.2 mm² to 1.5 mm² , in particular 0.5 mm² , and extend over a length of at least 50 m.
  5. Power supply for crane systems according to one of the preceding claims, wherein the electrical voltage is transformed as direct or alternating voltage from a voltage value of 12 V or 24 V to a voltage value of 48 V or 48 V +/- 5 V.
  6. Energy supply for crane systems according to Claim 1 or 2 , wherein at the end of the boom (3), near the tip (6), a movable articulated arm (10) is mounted, which can be tilted and/or rocked in two or between two positions (A) or (B) by an electric drive (12), preferably a motor with gearbox.
  7. Energy supply for crane systems according to Claim 1 or 6 , wherein further consumers, in particular lamps, winches, headlights, movable headlights, cameras, movable cameras, force sensors, pressure sensors, linear actuators or other winch motors, are arranged on the movable articulated arm (10) and are supplied with energy or controlled.
  8. Power supply for crane systems according to one of the preceding claims, wherein the cable (20) has several insulated conductors, of which at least two conductors are provided for the power supply of the consumer, wherein at least one further conductor is provided for the transmission of measurement data of the consumer.
  9. A method for supplying energy to a crane system, comprising a mobile crane (1) with a chassis (2) on which a telescopic boom (3) is mounted, over which a lifting rope (4) is guided, which can be wound up at a first rope end in a drum (5), wherein the lifting rope (4) is guided over a tip (6) of the boom (3) and is provided at a second rope end with a hook (7) with which loads (8) can be lifted, wherein at least one consumer is attached to or near the tip (6) of the boom (3), in particular a lamp, a winch and/or a drive (12), and wherein a cable (20) is guided along the boom (3) for supplying energy to the at least one consumer, which can be wound up in a rope length sensor (21), characterized in that , for the transmission of electrical power, an electrical voltage is transformed to a first voltage value in a first converter (23) at or before the rope length sensor (21), and that the electrical voltage at the end of the cable (20), at or near the tip (6) of the boom (3), the voltage is transformed to a second voltage value in a second converter (22) to supply voltage to the consumer, the first voltage value being higher than the second voltage value.
  10. Method for supplying energy to a crane system according to Claim 9 , where the first voltage value is a multiple, in particular which corresponds to twice the second voltage value.
  11. Method for supplying energy to a crane system according to one of the Claims 9 until 10 , where the electrical voltage is transformed as direct or alternating voltage from a voltage value of 12 V or 24 V to a voltage value of 48 V or 48 V +/- 5 V.
  12. Method for supplying energy to a crane system according to one of the Claims 9 until 11 , wherein the first and/or second converter (23, 22) is a DCDC converter which provides an electrical current of 30 A, 60 A or 80 A.
  13. Method for supplying energy to a crane system according to one of the Claims 9 until 12 , where pulse width modulation is used for voltage conversion and/or transformation.
  14. Method for supplying energy to a crane system according to one of the Claims 9 until 13 , wherein a monitoring unit monitors for a short circuit in the cable (20) or a short circuit to ground or a resistance deviation to the mobile crane (1) or boom (3) and activates an alarm or a shutdown unit upon detection.
  15. Method for commissioning a crane system with an energy supply according to one of the Claims 1 until 8 , wherein, during each commissioning, consumers or attachments connected via the cable (20) to the boom (3) are queried one after the other as part of a cybersecurity check, whereby the consumers or attachments are digitally compared with a test code stored in a central control unit, and only after successful cybersecurity verification are the consumers or attachments supplied with the actual load current via the cable (20), or only then are they activated for use.

Description

TECHNICAL AREA The invention relates to a power supply for crane systems with a voltage converter, to a method for supplying power to a crane system, and to a method for commissioning a crane system. SUMMARY OF THE INVENTION The invention relates in particular to a power supply for crane systems, a so-called “High Power Cable Reel”. Mobile cranes with a flexible cable, wound onto a drum, are known from the prior art. This cable supplies the crane components with onboard voltage, even when the crane components shift relative to each other and thus change in their relative length, or when the crane components move. A power transmission limit results from the cable cross-sections used and the known principle according to which the transmissible electrical power corresponds to the product of the voltage and the current (P = U x I). The German utility model specification is from patent literature. DE 20 2013 010 381 U1 known. The subject of the utility model is a drive for a sliding cam of a locking system of a telescopic system. Furthermore, with the DE 10 2016 007 053 A1 A mobile crane with a telescopic boom and luffing jib is revealed. The luffing jib can be powered by the mobile crane via a variable-length supply line, which is housed in a drum mounted on the telescopic boom. From the WO 2012/133657 A1 A crane device with a PWM converter is also disclosed. The PWM converter switches alternating current, which is supplied from a busbar via a PWM controller, in order to convert the alternating current into direct current, thus reducing the phase difference between the voltage and current of the alternating current. Furthermore, the WO 93/18566 A1 a method for the economical transmission of low-power electrical energy over long distances, wherein this energy is transmitted single-phase using a transmission voltage with a low non-zero transmission frequency. Finally, the DE 10 2016 009 987 A1 A method for supplying power in a power distribution system in the low-voltage range below 25 volts AC or 60 volts DC, in which at least one power supply unit and two or more voltage converters are used to supply at least two possible electrical consumers. Furthermore, a corresponding power distribution system and associated equipment are disclosed. A disadvantage of existing systems is that, when using the on-board electrical system of a mobile crane, only a limited voltage is available to supply the consumers. Power losses, which are almost unavoidable over the long cable runs that need to be bridged, can also be considered a disadvantage. A primary objective of the invention is to provide a power supply for consumers on mobile cranes with particularly high power requirements over long distances. Furthermore, a system for the flexible electrical supply of a crane component that is subject to relocation is to be created. The objectives are achieved by the subject matter of the independent claims. Features of advantageous embodiments of the invention are found in the respective dependent claims. A power supply for crane systems comprises a mobile crane with a chassis on which a telescopic boom is mounted, over which a lifting cable runs. The lifting cable can be wound onto a drum at one end. Furthermore, the lifting cable is guided over a tip of the boom and equipped with a hook at the other end, which can be used to lift loads. At least one consumer is arranged, and in particular attached, at or near the tip of the boom. This consumer can be, in particular, an electrical device, such as a lamp, a winch, and/or a drive. A cable is routed along the telescopic boom to supply power to this consumer, either via the ship's electrical system or a power supply unit of the crane system. This cable can be wound into a cable length sensor. The telescopic boom can, for example, comprise several telescopic stages, each stage designed as a square hollow profile or hollow box profile. The support cable and the cable of the cable length sensor can run along the telescopic boom. The bare boom is guided in its longitudinal direction. The support cable and the cable of the cable length sensor can be routed along the outside of the boom. In a particularly advantageous embodiment, the support cable and/or the cable of the cable length sensor can also be guided within the hollow profile of the boom. This effectively protects the support cable and especially the cable of the cable length sensor from damage, contamination, or the like. One primary function of a cable length sensor can be, for example, to determine the length of the boom. The housing of the cable length sensor may contain a drum for winding the cable. The cable length wound on the drum can be at least equal to the maximum length of the boom. If extension parts are provided for extending the boom length, a correspondingly longer length of cable can be stored on the drum. Furthermore, the housing of the cable length sensor may incorporate a mechanism for tensioning the cable. A seco