CRANE

Description

[0001] The present invention relates to a crane, in particular a tower crane, with a crane boom from which a load hook can be raised and lowered via a hoist rope, as well as an electrical power supply on the load hook and / or a trolley, if present, which can be moved on the crane boom.

[0002] For certain lifting tasks, it is necessary or at least helpful to have an electrical connection on the load gear or load hook, for example to operate electric lifting magnets for magnetic lifting tasks, or to use cameras, sensors, or other attachments with, for example, electric actuators on the load hook. If the crane has a trolley on the boom, as is the case with tower cranes, for example, it is sometimes also necessary or helpful to have a power connection on the trolley, either to transmit power from the trolley to the load hook via a spring cable reel, or to supply electrical power to other consumers on the trolley, such as spotlights, cameras, sensors, or other electrical devices.

[0003] A crane according to the preamble of claim 1 is known from US Pat. No. 5,071,184 B, which shows a load hook rotatable by motor about an upright axis. A generator is integrated into the load hook block to supply power to the rotary drive. The generator is driven by the rope deflection pulley via a planetary gear, whose rotating axis drives the planetary gear. See also WO 2013 / 160548 A1.

[0004] In order to supply electricity to a power connection on the trolley and / or the load hook, it has already been proposed to use trailing cables to transport electrical energy first to the trolley and then, using spring cable reels, further down to the load hook. However, installing trailing cables and spring cable reels on the boom in this way is very cumbersome and is only suitable for stationary cranes where space requirements and ease of assembly are not a major consideration. For fast-erecting cranes or so-called taxi cranes, which are often erected and dismantled daily or even several times a day and only rarely weekly, ease of assembly and transport on the road, the folding and folding work involved in road transport, and also the weight issue on the boom are of great importance. For such quick-erecting orFor fast-erecting cranes, the solutions mentioned for supplying electricity to a consumer on the trolley or load hook are unsatisfactory.

[0005] EP 3 178 772 A1 also discloses conducting electrical current to the trolley via the electrically conductive trolley cable and to the load hook via the electrically conductive hoist cable. For this purpose, electrical conductors are embedded in the cable core of the trolley cable and surrounded by several outer strands that serve as protective conductors. While such power transmission via the load-bearing cables eliminates the need for separate trailing cables and spring cable reels, conventional, uninsulated steel cables cannot be used.

[0006] The present invention is therefore based on the object of creating an improved crane of the type mentioned above that avoids the disadvantages of the prior art and advantageously develops them further. In particular, electrical power is to be provided to the load hook and / or trolley of the crane in a simple and efficient manner without compromising ease of assembly, creating excessive space requirements on the boom, or requiring complex cable structures.

[0007] According to the invention, the stated object is achieved by a crane according to claim 1. Preferred embodiments of the invention are the subject of the dependent claims.

[0008] It is therefore proposed to generate electrical power directly where it is needed, thereby converting the kinetic energy present there into electricity. According to the invention, the electrical power supply comprises a generator mounted on the load hook or trolley, which is driven by a pulley. By mounting such a generator on the pulley block of the load hook or trolley, additional power lines or those that are complexly integrated into the load-bearing cables can be avoided, since the generator generates and supplies the electrical power directly at the load hook or trolley.

[0009] Depending on the load to be supplied, the power provided by the generator can be supplied directly to the load, possibly via power and / or supply and / or control electronics, and / or at least partially fed into an electrical storage device acting as a buffer, from which the stored energy is then supplied to the load. Such an electrical buffer device can, for example, be a rechargeable battery or a battery, or even a capacitor, or comprise such components.

[0010] A direct energy supply without intermediate storage is suitable, for example, for loads that only require power when the load hook and / or trolley are moving. Such loads could be sensors that record the travel distance. However, an energy supply using intermediate storage can be advantageous when loads need to be supplied that also require electrical power when the trolley and / or load hook are stationary. These could also be sensors, for example, but also actuators, communication modules, or processors that control the corresponding actuators, sensors, or communication devices.

[0011] If at least a portion of the electrical energy provided by the generator is fed into the electrical buffer storage device, the feed can be controlled by power electronics for charging and / or discharging the energy storage device. Such power and / or supply and / or discharge electronics can protect the buffer storage device from overcharging and evenly supply power to consumers fed from the buffer storage device. The charge level of the buffer storage device can be taken into account when charging or discharging the buffer storage device, if necessary.

[0012] In an advantageous development of the invention, the electrical current generated by the generator can be used, with or without intermediate storage, to power at least one sensor and a communication module connected thereto for transmitting a sensor signal. In an advantageous development of the invention, the sensor signal can be transmitted wirelessly from the communication module to a control unit or a control device, whereby various wireless transmission formats can be used. In particular, the sensor signal can be transmitted wirelessly, in which case the communication module comprises a radio module.

[0013] If a generator is mounted on the load hook, the rotational movement of a pulley around which the hoist rope is deflected and / or the movement of the hoist rope relative to the load hook can be used to drive the generator. The generator can be driven by the rotational movement of the pulley and, if necessary, also by the travel movement of the hoist rope.

[0014] If a generator - or another generator - is mounted on the trolley, the generator can be driven by the rotational movement of a pulley, which is used to guide the trolley on the boom and which rotates when the trolley moves. Alternatively or additionally, a generator mounted on the trolley can also be driven by a deflection pulley, around which the hoist rope running from the trolley is deflected, or - depending on the rope guide - a trolley travel rope is deflected. In addition, a generator mounted on the trolley can also be driven by a rope running past the trolley, i.e. by its rope movement, for example the hoist rope running from the trolley or a strand of the trolley travel rope running past the trolley.

[0015] Advantageously, a generator arranged on the trolley can also be driven in a hybrid manner, i.e., optionally or additionally by the hoist cable running from the trolley and / or a deflection pulley that deflects the hoist cable and is rotatably mounted on the trolley, as well as by a pulley that guides the trolley on the boom, and / or by the trolley cable. For this purpose, the generator can be driven by two drive trains or two drive wheels or shafts, if necessary via a freewheel and / or coupling device, in order to capture, on the one hand, a travel movement of the trolley and, on the other hand, a lifting or lowering movement of the hoist cable and convert electrical energy.With such dual drive capability, the generator can provide energy when the trolley is stationary, when the hoist rope is lowered or raised, and also provide energy when the trolley is moving, even when the hoist rope is neither raised nor lowered.

[0016] In order to be able to use the rotational movement of a deflection and / or idler pulley to drive the generator, the said deflection or idler pulley can have a roller axle that rotates with the roller and is rotatably mounted on the roller carrier - for example, a hook block housing or carrier or the trolley frame. The rotating roller axle can drive the generator directly, whereby the generator shaft can, for example, be located directly on the said roller axle and / or be rigidly and / or at least non-rotatably connected to it and / or be integrally formed therewith. Alternatively, the rotational movement of the said roller axle can also be transmitted to the generator via a gear stage, for example in the form of a spur gear stage or a planetary gear stage, which translates or reduces the roller rotation into generator rotation.

[0017] However, the idler or idler pulley does not need to have such a rotating roller axle, but can also be mounted on a stationary axle. Regardless of this, the roller body or its rotational movement can serve as the drive for the generator.

[0018] According to the invention, a friction raceway is arranged on the roller body in a rotationally fixed manner and rotates with the roller body, wherein the generator or a gear stage connected thereto has a drive wheel that rolls on the friction raceway.

[0019] The friction track is provided for a cable guide flange. A bearing flange and such a cable guide flange are usually thicker than the roller body located between them, so that there is sufficient space for the formation or attachment of the friction track. Depending on the desired transmission ratio, the relatively larger diameter of the cable deflection flange of the roller body is preferred.

[0020] In order to achieve a particularly space-saving design, a drive wheel for driving the generator, which meshes with the gear ring or rolls along the friction track, can be arranged between said bearing flange and said cable deflection flange of the roller body and / or can have a rotation axis that is arranged substantially parallel or inclined at only a small angle to the rotation axis of the deflection or idler pulley. In particular, said drive wheel can be arranged at least partially in the annular pocket of the roller body between its bearing flange and its outer flange and / or can be arranged at least partially overlapping it in the radial direction, i.e., within the width of the bearing flange and / or the outer flange of the deflection or idler pulley.

[0021] In principle, however, the drive wheel that picks up the drive movement of the deflection pulley or idler pulley can also be arranged in a different way, for example with a rotation axis aligned radially to the roller rotation axis, as is the case with bevel gear stages.

[0022] If the deflection pulley or the roller is rotatably mounted by at least one rolling bearing, the generator or at least one drive wheel driving the generator can be assigned to the said rolling bearing, in particular integrated into the rolling bearing.

[0023] Such a design of the generator associated with the rolling bearing can be achieved, for example, in that the rolling bearing ring rotating with the roller body is connected to a gear ring and / or has a friction raceway with which the generator-side drive wheel is in rolling engagement.

[0024] The generator can also be integrated directly into the aforementioned rolling bearing, for example, by attaching primary and secondary coils, or an induction coil and a magnet or magnetic coil, to the two mutually rotatable rolling bearing rings. Advantageously, the coil in which the electric current is induced can be assigned to the stationary rolling bearing ring, while the rotor is assigned to the rotating rolling bearing ring.

[0025] By integrating the generator or generator components into the rolling bearing, which rotatably supports a deflection pulley or track roller, conventional roller bodies can be used. The rolling bearing with the integrated generator can form a standalone, pre-assembled assembly, by means of which a conventional track roller or deflection pulley is rotatably supported.

[0026] In addition to driving a generator from the pulley body of the deflection pulley or the idler pulley, a generator can also have a rope contact wheel that serves as a drive wheel and runs directly on the rope, so that the passing rope drives the generator. This rope contact wheel can be attached directly to the generator shaft, but can also be connected to the generator via a gear stage.

[0027] The rope contact wheel mentioned can form a friction wheel which is driven by friction from the running rope.

[0028] To save space and achieve a compact arrangement, the aforementioned rope contact wheel can be arranged on the circumference of a deflection pulley and contact a section of rope that is deflected around the deflection pulley or is in contact with the deflection pulley. On the one hand, this prevents the rope from evading the rope contact wheel, as it is supported by the circumferential surface of the deflection pulley. On the other hand, the rope contact pulley can be easily mounted, particularly on the support on which the deflection pulley is also rotatably mounted.

[0029] Alternatively or additionally, however, a rope contact wheel can also be provided which contacts a free rope section running from the deflection pulley or running onto it.

[0030] To achieve sufficient frictional forces to allow the rope contact wheel to rotate safely and roll along the rope, the rope contact wheel can be tensioned against the rope by means of a pretensioning device, particularly in a direction transverse to the longitudinal direction of the rope. Such a pretensioning device can, for example, comprise a spring device that pushes or pulls the rope contact wheel against the rope with spring force.

[0031] Such a pre-tensioning device can be supported on the pulley support, on which the pulley is also mounted. Alternatively or additionally, support for the pre-tensioning device can also be provided on the rope itself, for example, by two rope contact rollers resting on the rope from opposite sides and pre-tensioned relative to each other.

[0032] The invention is explained in more detail below with reference to the drawings. In the drawings: Fig. 1: a schematic side view of a crane which is designed as a tower crane according to an embodiment of the invention and has a boom along which a trolley can be moved, from which a load hook can be lowered via a hoist rope, Fig. 2: a partial, perspective view of the boom of the crane from Fig. 1 , on which the trolley is shown, from which the hoist rope with the load hook attached to it runs off, Fig. 3: a schematic sectional view of the load hook of the crane from the previous figures with the deflection pulley attached to it, which is provided with a gear ring not according to the invention, via which the deflection pulley drives a generator that is attached to the housing of the deflection block, Fig. 4: a schematic sectional view of the load hook and the deflection pulley attached to it, similar Fig. 3, the generator being driven again by a gear ring on the deflection pulley which, in comparison to Fig. 3however, not on the bearing flange of the deflection pulley, but on the outer peripheral flange of the deflection pulley, in which the rope pulley is incorporated, Fig. 5: a schematic sectional view of the load hook and the deflection pulley hinged thereto, wherein the generator in this non-inventive embodiment is integrated into the roller bearing, via which the deflection pulley is rotatably mounted on the pulley axle, Fig. 6: a schematic sectional view of the load hook and the deflection pulley connected thereto, wherein according to a further non-inventive embodiment of the invention, the deflection pulley is connected in a rotationally fixed manner to a roller axle, which rotates with the deflection pulley and drives the generator via a spur gear stage, Fig.7: a side plan view of the load hook and the deflection pulley connected thereto, wherein according to a further embodiment of the invention, the generator is driven by a rope contact wheel which is arranged circumferentially on the deflection pulley and rolls on the rope which is guided around the deflection pulley, Fig. 8: a side plan view of the load hook and the deflection pulley connected thereto of a non-inventive embodiment, wherein the generator is driven by a rope contact wheel which rolls on the rope section which runs onto the deflection pulley or runs off the deflection pulley, wherein various suspensions or pretensioning devices are shown, by means of which the rope contact wheel is pressed against the rope, Fig.9: a side plan view of the load hook and the deflection pulley connected thereto of an embodiment not according to the invention from the preceding figures, wherein two rope contact wheels for driving the generator roll on the one hand on the incoming rope section and on the other hand on the outgoing rope section and are braced against each other in order to be pressed against the rope section, and Fig. 10: a side plan view of the load hook and the deflection pulley of an embodiment not according to the invention similar to the preceding figures, wherein a drive wheel for driving the generator runs on the outer circumferential side of the deflection pulley in an area in which the rope does not contact the deflection pulley.

[0033] How Fig. 1shows, the crane 1 can be designed as a tower crane and have a tower 2 which carries a cantilevered boom 3. The crane can be a top-slewing crane in which the boom 3 can be rotated relative to the tower 2, or the tower 2 can be seated with its lower end on a slewing platform which can be rotated about an upright axis and supported on an undercarriage which can be designed as a truck or can be moved in some other way, but which can also form a rigid, non-movable support base if necessary.

[0034] The boom 3 can be guyed via a guying system, which can be adjustable if necessary in order to be able to swing the boom 3 up and down.

[0035] The crane 1 can also be designed as a fast-erecting crane, the tower 2 of which can be telescopic and the boom 3 of which can be collapsible and / or telescopic, so that the tower and boom can be combined to form a transport package suitable for road transport.

[0036] How Fig. 1 As shown, a trolley 5 can be mounted on the boom 3 for longitudinal movement, which trolley can be moved back and forth by means of a trolley cable 8. An inner trolley cable 8i leads from the trolley 5 via a deflection pulley at the inner end section of the boom 3 near the tower to a trolley winch 9, while an outer trolley cable 8a leads from the trolley 7 via a deflection pulley at the outer end section of the boom 3 to the aforementioned trolley winch 9.

[0037] How Fig. 2shows, the said trolley 5 is guided and mounted on the boom 3 via rollers 10 so as to be longitudinally movable, wherein the said boom 3 has, for example, tracks for the said rollers 10 on its lower chords.

[0038] How Fig. 2 As further shown, deflection pulleys 11 can be provided on the trolley 5, around which a hoist rope 12 is deflected, to which a load hook 7 is attached. The said hoist rope 12 can, for example, be attached to the boom tip and wound onto a hoist rope winch at the inner end of the boom 3 or on the counter-jib in order to be able to lower and retrieve the hoist rope 12 from the trolley 5.

[0039] The hoist rope 12 runs on the hook side around a deflection pulley 13 which is rotatably attached to a deflection pulley carrier 14 which carries the aforementioned load hook 7.

[0040] As the Figures 3 to 10show, a generator 15 can be arranged on the said load hook 7 or the deflection pulley carrier 14 connected thereto in order to be able to generate electrical current on the load hook 7, wherein the said generator 15 can advantageously be driven by the deflection pulley 13, the hoist rope 6 deflected around the deflection pulley 13 or a roller bearing rotatably supporting the deflection pulley 13, as will be explained in more detail below.

[0041] To compensate for any imbalance, a counterweight can be attached to the side of the hook block opposite the generator.

[0042] In a corresponding manner, such a generator 15 can also be provided on the trolley 5, wherein this trolley-side generator 15 can be driven in an analogous manner by one of the deflection pulleys 11 provided there, one of the rollers 10, or a roller bearing by means of which the deflection pulley 11 or the roller 10 is rotatably mounted on the frame of the trolley 5. In the following, only the drive mechanism on the deflection pulley 13 on the load hook 7, the roller bearing provided there, and the hoist cable 6 deflected there will be explained. It is understood, however, that the trolley-side drive mechanism on the deflection pulley there, the roller bearing there, the roller bearing there, the hoist cable deflected there, or the trolley cable running past there can be designed in a completely analogous manner.

[0043] How Fig. 3shows, the deflection pulley 13, around which the hoisting rope 6 is deflected on the load hook 7, can comprise a roller body 16 which is rotatably mounted via one or more roller bearings 17 on a roller axle 18 which is fastened to the deflection pulley carrier 14. The axis of rotation 19 of the deflection pulley 13 extends essentially perpendicular to the plane spanned by the hoisting rope 12 and thus essentially horizontally. The aforementioned roller body 16 can sit on the aforementioned roller bearing 17 with a widened or thickened bearing flange 19, although in principle another type of bearing, for example a plain bearing or a rotatably mounted axle, would also be conceivable.

[0044] On the other hand, the aforementioned roller body 16 comprises a thickened cable flange 20 on the outer edge, in which a cable groove is incorporated, open to the outside, in which the deflected cable runs. Between the aforementioned bearing flange 19 and the likewise widened or thickened cable flange 20, an annular, thinner intermediate region of the roller body 16 is provided, see. Fig. 3 .

[0045] To drive the generator 15, a gear ring 21 can advantageously be provided on the roller body 16, with which a drive gear 22 can be in rolling engagement. Said gear ring 21 can advantageously be provided on said bearing flange 19, for example in the form of an external toothing.

[0046] How Fig. 4 shows, the said gear ring 21 can also be arranged on the cable flange 20, for example in the form of an internal toothing in the manner of a ring gear.

[0047] Instead of a gear ring and a meshing drive pinion, according to the invention, a friction track is provided on the roller body 16, which is designed analogously to the gear ring 21 on the cable flange 20, for example in the form of an outer peripheral or inner peripheral ring. If a friction track is provided, the aforementioned drive wheel 22 can be a friction wheel.

[0048] As the Figures 3 and 4show, the drive wheel 22 can advantageously be arranged between the bearing and cable flanges 19, 20, in particular in the region of the thinned, annular connecting section of the roller body 16, wherein the drive wheel 22 is arranged at least partially within the width of the bearing flange 19 and / or the cable flange 20 and - viewed in the radial direction to the axis of rotation of the deflection roller 13 - can overlap with the aforementioned bearing flange 19 and / or the cable flange 20. Advantageously, the drive wheel 22 can be completely received in the plate-shaped, annular depression provided between the bearing flange 19 and the cable flange 20, cf. Figures 3 and 4 .

[0049] Said drive wheel 22 can advantageously have a rotational axis 23 which can extend substantially parallel to the rotational axis of the deflection roller 13, wherein the rotational axis 23 of the drive wheel 22 can be spaced from the rotational axis of the deflection roller 13.

[0050] How Fig. 3shows, the aforementioned drive wheel 22 can drive the generator shaft or the rotor of the generator 15 in rotation, wherein the generator shaft can be directly connected to the drive wheel 22. Alternatively, a gear stage 24 can be provided between the drive wheel 22 and the generator shaft, which gear stage can be designed as a spur gear stage or a planetary gear stage, but also as a bevel gear stage or as another gear stage or combinations thereof. The drive wheel 22 and / or the generator shaft 25 and / or the optionally intermediate gear stage 24 can advantageously be mounted or fastened to the deflection pulley carrier 14, wherein the coils and / or the magnet and / or the other functional components of the generator 15 can be enclosed on the generator housing 26. The aforementioned generator housing 26 can, for example, be attached to a deflection pulley housing and / or be formed thereby.

[0051] How Fig. 3As shown in FIG. 1, the electrical current provided by the generator 15 can be fed via power and / or supply electronics S into an energy storage device such as a battery or a capacitor, which serves as a buffer and from which the electrical energy is then supplied to a consumer V, which can be, for example, a sensor, an actuator, a communications module, or a processor. For example, a gripping device attached to the load hook 7 can be supplied with power, for example, comprising a magnet or the like, although other consumers are also possible, as already explained at the beginning.

[0052] For example, a position sensor can be provided on the load hook, which can determine the position of the load hook relative to the crane structure and / or objects to be picked up and is supplied with power from the generator 15. Alternatively or additionally, such a sensor can also be a motion sensor and / or acceleration sensor to determine movements and / or accelerations of the load hook. For example, a gyroscopic sensor can be provided. In principle, however, other sensors, such as weighing or weight sensors, can also be used and supplied with power from the generator.

[0053] Advantageously, a communication module can be connected to the respective sensor to transmit the sensor signal, preferably wirelessly, to a control device. The communication device can advantageously comprise a radio module for transmitting the sensor signal wirelessly.

[0054] If necessary, the electrical current provided by the generator 15 can also be supplied to the consumer V without intermediate buffering in an energy storage device A.

[0055] The generator 15 can be designed as a direct current generator or as an alternating current generator.

[0056] How Fig. 5As shown, the generator 15 can also be integrated directly into the roller bearing 17, via which the deflection pulley 13 - possibly also the roller 10 of the trolley 5 or the deflection pulley 13 provided there - is rotatably mounted. For example, one of the roller bearing rings of the roller bearing 17 can be provided with an induction coil, while the other roller bearing ring can be provided with a magnetic rotor or a magnetic coil or can be designed as a magnetic rotor. Advantageously, the generator coil, in which the current is generated, can be connected to the stationary roller bearing ring, while the rotor is connected to the roller bearing ring, which rotates with the roller.

[0057] How Fig. 6shows, the generator 15 can also be driven by the axis of the deflection pulley 13 - or the axis of the roller 10 or the deflection pulley 11 - in which case the roller axis 18 is connected to the roller body 16 in a rotationally fixed manner and rotates therewith. As Fig. 6 shows, the roller axis 18 can be rotatably mounted on the deflection bottle carrier 14 via roller bearings 17.

[0058] The roller axle 18 driven by the roller body 16 can drive the generator shaft 15 or its rotor directly or via a gear stage 24, wherein the said gear stage 24 can be a spur gear stage, as Fig. 6 shows, but can alternatively also be designed as a planetary stage or in another way.

[0059] As the Figures 7 to 9As can be seen, the drive wheel 22, which drives the generator directly or via a gear stage 24, can also be designed as a rope contact wheel, which can run on the hoist rope 12 - or possibly also on the trolley rope 8 - in order to convert the rope movement into a rotary drive movement.

[0060] How Fig. 7 shows, such a drive wheel 22 designed as a rope contact wheel can advantageously be arranged on the circumference of the deflection pulley 13 and be in contact with or roll on a rope section which is deflected around the deflection pulley 13.

[0061] To achieve sufficient frictional force or to ensure the safe rolling of the drive wheel 22 on the cable, the drive wheel 22, designed as a cable contact wheel, can be pressed or tensioned against the cable via a pretensioning device 27 to increase the contact forces. Said pretensioning device 27 can, for example, comprise a spring device that pulls the cable contact wheel against the cable transversely to the longitudinal direction of the cable.

[0062] Said cable contact wheel can be held in place by an anchor 28, for example in the form of a rocker arm that can move transversely to the longitudinal direction of the cable. The anchor 28 can form a wheel suspension on which the cable contact wheel is rotatably mounted and which holds the cable contact wheel at the intended location on the cable.

[0063] How Fig. 7shows, the drive wheel 22 designed as a cable contact wheel can advantageously be arranged inside the deflection pulley carrier 14, in particular in an annular region between the deflection pulley 13 and the outer wall of the housing of the deflection pulley carrier 14.

[0064] How Fig. 8 shows, a drive wheel 22 designed as a cable contact wheel can also be arranged outside the deflection pulley carrier 14 and connected to the cable section that runs onto or off the deflection pulley. As Fig. 8As shown, a single drive wheel 22 can be pre-tensioned against the rope by a pre-tensioning device 27 transversely to the longitudinal direction of the rope and held in place by a wheel suspension 28, wherein the pre-tensioning device 27 and / or the suspension 28 can be supported on the deflection block carrier 14. If such a rope contact wheel is provided on the trolley 5, the pre-tensioning device 27 and / or the wheel suspension 28 can be supported on the trolley or its frame.

[0065] Like the right side of the Fig. 8shows, the drive wheel 22 designed as a rope contact wheel can also be held on the rope or tensioned against the rope via further rope contact wheels, wherein here too a pretensioning device 27, for example comprising a spring device, can ensure the contact pressure of the drive wheel 22 against the rope and a wheel suspension or anchoring 28 can support the plurality of rope contact wheels on the deflection block carrier 14 - or analogously on the frame of the trolley 5.

[0066] The rope contact wheels shown can drive the generator shaft or the rotor of the generator 15 directly or via a gear stage 24, analogously to the previously described embodiments.

[0067] How Fig. 10shows, the drive wheel 22 can also roll on the outer circumference of the deflection pulley 13, for example run in the rope groove provided there, in which case the drive wheel 22 can advantageously be mounted directly on the deflection pulley carrier 14, advantageously in a section between the outgoing and the incoming rope section, in which the deflection pulley 13 does not contact the rope.

Claims

1. A crane, in particular a revolving tower crane, comprising a crane boom (3) from which a lifting hook (7) can be raised and lowered via a hoist rope (12) and an electric power supply at the lifting hook (7) and / or a trolley (5) optionally present and travelable at the crane boom (3), wherein the power supply has a generator (15) that is arranged at the lifting hook (7) or at the trolley (5) and that is drivable by a deflection pulley (13; 11), characterized in that the deflection pulley (13; 11) has a friction track with which a drive wheel (22) configured as a friction wheel for driving the generator (15) is in rolling engagement, with the friction track being provided at a widened rope flange (20) of the deflection pulley (13; 11).

2. A crane in accordance with the preceding claim, wherein the drive wheel (22) and the deflection pulley (13; 11) have rotational axles that are at least approximately in parallel with one another and said drive wheel (22) is arranged in a thinned, annular roller zone between the thickened bearing and rope flanges (19, 20).

3. A crane in accordance with one of the preceding claims, wherein the generator (15) is connected to an energy store A via power and / or feed electronics S and the energy store A has a connection for connecting a consumer.

4. A crane in accordance with one of the preceding claims, wherein the generator (15) has a consumer connection for the direct supply of a consumer V without buffering the power produced by the generator (15).

5. A crane in accordance with one of the preceding claims, wherein the generator (15) is fixedly installed at a pulley block carrier (14) to which the lifting hook (7) is fastened.

6. A crane in accordance with one of the preceding claims, wherein the / a further generator (15) is fixedly installed at the trolley (5).

7. A crane in accordance with one of the preceding claims, wherein at least one sensor is supplied with electric power by the generator (15), with said sensor preferably being arranged at the lifting hook (7) or at the trolley (5).

8. A crane in accordance with the preceding claim, wherein a communication device for transmitting the sensor signal to a control device is connected to said sensor and is supplied with power by the generator (15).

9. A crane in accordance with the preceding claim, wherein the communication device has a radio module for transmitting the sensor signal by radio.