EP2984021B1 - Crane comprising a crane cantilever arm, wherein the current is supplied to the load hook and crane trolley via a rope transmitting tractive forces - Google Patents

Description

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 hoisting rope, and an electrical power supply to the load hook and a trolley movable on the crane jib.

Such a crane is for example from the Scriptures WO 01/78086 A1 known. A similarly trained Derrick crane shows the font GB 223,705A ,

For certain lifting tasks, it is necessary or at least helpful to have an electrical power connection available at the load harness or load hook, for example, to operate electric lifting magnet for magnetic lifting tasks, or to use other attachments with, for example, electrical servomotors on the load hook. If the crane has a trolley on the boom, as is the case, for example, with tower cranes, it is sometimes necessary or helpful to have a power connection to the trolley, either to be able to forward the current to the load hook from the trolley via a spring drum, or to power other consumers on the trolley, for example, headlights or other electrical appliances.

For the electrical supply of a power connection to the trolley and / or the load hook has already been proposed to transport with the help of trailing cables electrical energy first to the trolley and with the help of spring reel drums further down to the load hook. However, such an installation of trailing cables and spring reel drums on the boom is very bulky and suitable only for stationary cranes, where space and ease of installation play no greater role. For fast-erecting cranes or so-called taxi cranes, which are often assembled and dismantled daily or even several times a day and only rarely weekly, is the ease of assembly and transport on the road and the collapsing or -faltbarkeit for road transport and weight problems Boom of great importance. In such Schnellmontage- or fast-erecting cranes said solutions for the electrical supply of a consumer to the trolley or on the load hook unsatisfactory.

The present invention is therefore an object of the invention to provide an improved crane of the type mentioned above, which avoids the disadvantages of the prior art and the latter further develops in an advantageous manner. In particular, electrical energy is to be provided in a simple and efficient manner on the load hook and / or on the trolley of the crane, without impairing the ease of installation and to create excessive, bulky space on the boom.

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

It is therefore proposed to integrate the power supply in a running rope of the crane, which leads to the movable member to which the power connection is desired, and to use the running rope in addition to its actual task at the same time for power transmission. Through this dual function of the current rope bulky additional components can be saved and a higher ease of installation can be achieved. According to the invention, the electrical power is supplied for load hook and / or trolley at least partially via a running, in crane operation as intended tensile tensile rope. The rope is designed as an electric traction cable, which can simultaneously transmit tensile forces and transport electricity.

In this case, the crane has a movably mounted on the boom trolley, according to the invention a trolley traveling Katzfahrseil is electrically conductive and feeds a power connection provided on the trolley. Advantageously, in particular an inner Katzfahrseil which connects the trolley with an inner, usually hinged to a tower end or a deflection roller provided there, electrically conduct in the above manner or be designed as an electric traction cable, so that the power supply or current collector on the Trolley is electrically powered via the interior Katzfahrseil with which the trolley is pulled or moved to the inner end of the crane jib out.

Alternatively or additionally, in principle, an outer Katzfahrseil which connects the trolley with an outer, cantilevered boom end, be designed as an electric traction cable to supply the trolley with power. In an advantageous embodiment of the invention, however, the outer Katzfahrseil may be formed as a conventional traction cable that does not form an electric traction cable, whereby the outer Katzfahrseil compared to an electric traction cable can be thinner and lighter, which weight advantages on the outer, more critical for the moment load boom half brings.

The power supply in the electrically conductive Katzfahrseil can be done in an advantageous manner in the area of Katzfahrseilwinde. The Katzfahrseil may be connected to the trolley winch with Stromeinspeisemitteln, which may preferably have a slip ring transformer. Advantageously, the Katzfahrseil be struck on the trolley winch and with its at least one electrical conductor on a rotating with the wind power connection be connected, which can be fed via said slip ring transformer.

In order to bring the electric current from the trolley to the load hook, between the trolley and the load hook or a power hook arranged on the power connection, an electric cable can be provided, which can participate or compensate for the changes in distance by means of a spring drum, by lifting and lowering the load hook arise. In an advantageous embodiment of the invention, said spring storage drum is not provided on the trolley, but on the load hook or a thereto attachable attachment. As a result, in the area of the trolley, the space required for such a relatively bulky spring drum is avoided, which is particularly important in the case of fast-erecting cranes, which have no large reserve of space in the folded transport package. In addition, the spring reel drum can be easily disassembled and thus actually used only in those cases where it is needed.

On the trolley, advantageously, a plug connection, for example in the form of a socket or a plug, for connecting the electric cable, which leads to the load hook, may be provided.

Alternatively or additionally, a power connection provided or required in the region of the load hook can also be fed with electrical energy directly via the hoist cable leading to the load hook. The hoist cable can be formed in a development of the invention electrically conductive or as an electric traction cable comprising at least one electrical conductor.

A power supply to the load hook directly via the hoist rope is particularly advantageous if the boom of the crane, from which the load hook can be lowered and raised, is an adjusting boom, for example in the form of a luffing luffing jib and / or a telescopic telescopic jib, and / or in connection with a single-strand hoist rope insertion and / or a multi-strand Hubseileinscherung in which a Hubseilende posted on the load hook and / or connected to an associated attachment.

If the hoisting rope is designed as an electric traction cable, the electric current into the hoisting cable can advantageously be fed in the area of the hoist winch. The hoist rope can be connected in the region of the hoist winch with current feed means, which can comprise a slip ring transformer. In this respect, the power supply to the Katzfahrseil can be referenced as previously explained.

Fig. 1:

eine schematische Seitenansicht eines als Turmdrehkran ausgebildeten Schnelleinsatzkranes nach einer vorteilhaften Ausführung der Erfindung, wobei eine am Kranausleger verfahrbare Laufkatze über das Katzfahrseil mit elektrischer Energie versorgt wird, die mittels einer am Lasthaken bzw. einem damit verbundenen Anbauteil vorgesehenen Federleitungstrommel und einem zwischen Laufkatze und Lasthaken vorgesehenen Elektrokabel zum Lasthaken bzw. dem daran angeordneten Stromverbraucher geführt wird,

Fig. 2:

eine schematische Seitenansicht eines als Turmdrehkran ausgebildeten Schnelleinsatzkranes ähnlich Fig. 1, wobei eine elektrische Stromzuführung zum Lasthaken direkt über das Hubseil erfolgt, und

Fig. 3:

eine schematische Querschnittsdarstellung, eines als Elektrozugseil ausgebildeten Katzfahrseils oder Hubseils, die die Anordnung des elektrischen Leiters im Seilkern zeigt.

The invention will be explained in more detail with reference to preferred embodiments and accompanying drawings. In the drawings show:

Fig. 1:

a schematic side view of a trained as a tower crane fast-erecting crane according to an advantageous embodiment of the invention, wherein a movable trolley on the crane trolley is supplied via the Katzfahrseil with electrical energy provided by means provided on the load hook or an attached attachment spring line drum and between trolley and load hook Electric cable is led to the load hook or the power consumer arranged thereon,

Fig. 2:

a schematic side view of a trained as a tower crane fast-erecting crane similar Fig. 1 , wherein an electrical power supply to the load hook takes place directly via the hoist rope, and

3:

a schematic cross-sectional view of a trained as Elektrozugseil Katzfahrseils or hoisting rope, showing the arrangement of the electrical conductor in the cable core.

As Fig. 1 shows, the crane 1 can be designed as a tower crane and have a tower 2, which carries a cantilever boom 3. The tower 2 can sit with its lower end on a revolving stage 4, which is an upright axis is rotatable and supported on an undercarriage 5, which may be designed to be movable as a truck or otherwise, but may also form a rigid, non-movable support base.

The boom 3 can be guyed over a bracing 6, wherein the bracing 6 may optionally be designed to be adjustable in order to rock the boom 3 and can rock, as this Fig. 2 shows.

The crane 1 can be designed, in particular, as a fast-erecting crane, the tower 2 of which can be telescoped and its boom 3 can be folded and / or telescoped, so that the tower and outrigger can be collapsed to form a road transportable transport package.

As Fig. 1 shows, on the boom 3, a trolley 7 may be mounted longitudinally movable, which can be moved by means of a Katzfahrseils 8 back and forth. An inner Katzfahrseil 8i leads from the trolley 7 via a guide roller 10 at the inner, near the tower end portion of the boom 3 to a Katzfahrwinde 9, while an outer Katzfahrseil 8a leads from the trolley 7 via a guide roller 10 at the outer end portion of the boom 3 to said Katzfahrwinde 9 ,

Advantageously, the inner Katzfahrseil 8i be electrically conductive or designed as an electric traction cable to transport electrical power to a power connector 11 on the trolley 7. The power feed into the Katzfahrseil 8 can be done on the Katzfahrwinde 9, the current feed can be done by means of suitable Stromeinspeisemittel on the Katzfahrwinde, for example in the form of a Schleifringübertragers.

Advantageously, a corresponding electrical installation with residual current circuit breaker 12 is provided and connected to the Katzfahrseil 8, for example in the region of said Stromeinspeisemittel on the Katzfahrwinde. 9

In order to transport the electric current from the trolley 7 further to a power connection or load on the load hook 13, an electric cable 14 can be provided between the trolley 7 and the load hook 13, which is connected with its trolley end, for example, to the power connection 11 to the trolley cable may be, for example via a corresponding plug / socket connection or other releasable power coupling means.

To join in or compensate for the lowering and lifting movements of the load hook 13, a spring cable drum 16 can be provided on the load hook 13 or advantageously an associated attachment 15, cf. Fig. 1 ,

As Fig. 2 shows, a consumer or a power connection 17 on the load hook 13 or an attached attachment can also be supplied directly via the hoist rope 18 with electrical energy, in which case the hoist rope 18 is formed electrically conductive or as Elektrozugseil. This solution is particularly advantageous in cranes with adjustable boom, for example, in the in Fig. 2 way shown are tilted up and down. Advantageously, the hoist rope 18 is guided by means of a Einstangeinscherung to the load hook 13. In a multi-strand reeving, the cable guide is advantageously such that one end of the hoist rope 18 is struck on the load hook 13 or the end is connected to said power connection 17 in the region of the load hook 13.

The power supply to the hoist rope 18 can be advantageously carried out on the hoist winch 19, in which case - as described for the trolley - can be provided Stromeinspeisemittel example, with a slip ring transformer in the appropriate manner. Corresponding electrical installations with a residual current circuit breaker 12 may be provided accordingly.

As Fig. 3 shows, the electrically conductive Katzfahrseil 8 or hoist rope 18 may comprise at least one electrical conductor 20 which is embedded in the cable core is surrounded by a plurality of outer strands 21, which can serve as a protective conductor.

As the FIGS. 1 and 2 show, at the helm 22 of the crane or at another suitable location control switch 23 or other input means, which are preferably designed to be freely programmable, are provided to control, for example via radio attachments on the load hook 13. Corresponding switches or input means can alternatively or additionally also be provided on a radio remote control of the crane.

Claims (7)

1. A crane, in particular a tower crane with a crane jib (3) from which a load hook (13) can be raised and lowered via a hoisting cable (18), and an electric power supply (24) to the load hook (13) and/or to a trolley (7) that may be provided to be movable along the crane jib (3), wherein the power supply to the load hook (3) and/or to the trolley (7) is at least partly conducted via a running cable (8; 18) which transmits tractive forces as required for the crane operation, characterized in that a trolley cable (8) moving the trolley (7) is electrically conductive and supplies a power connection (11) provided at the trolley (7).
2. The crane according to the preceding claim, characterized in that the electrically conductive trolley cable forms the inner trolley cable (8i) which leads from the trolley (7) to an inner jib end section.
3. The crane according to one of the two preceding claims, characterized in that the trolley cable (8) is arranged on a trolley winch (9) that is advantageously arranged on the jib (3) and is connected with power input means advantageously comprising a slip ring transmitter.
4. The crane according to one of the preceding claims, characterized in that the power supply (24) to the load hook (13) comprises a spring cable reel (16) with a power cable between the trolley (7) and the load hook (13), whereby the said spring cable reel (16) is arranged on the load hook (13) and/or on an attachment part connected to it.
5. The crane according to one of the preceding claims, characterized in that the power supply to the load hook (13) is provided at least partly via the electrically conductive hoisting cable (18).
6. The crane according to the preceding claim, characterized in that the hoisting cable (18) is connected at a hoisting cable winch (19) with power input means advantageously comprising a slip ring transmitter.
7. The crane according to one of the preceding claims, characterized in that a control means to control an electrical attachment device that is suspended at the load hook (13) and that is supplied with electricity via the electrical power supply (24), is provided at a control stand (22) and/or at a radio remote control of the crane.

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