The present application claims the priority benefits of International Patent Application No. PCT/EP2015/077930, filed on Nov. 27, 2015, and claims benefit of DE 10 2014 117 561.1, filed on Nov. 28, 2014.
The invention relates to a trolley for lifting gear, comprising a lifting mechanism arranged on a support frame and comprising running wheels which are mounted on the support frame and via which the trolley can be moved on a beam and of which at least one first running wheel is mounted on an axle and the axle can be driven together with the running wheel by means of a drive motor.
German laid-open document DE 103 45 102 A1 discloses a trolley of a crane which can be moved via a total of four running wheels on and along a beam. The running wheels are typically arranged, as seen from above onto the beam, in the corners of a notional rectangle. One of the four running wheels is electrically driven. In order to transmit the drive forces of the driven running wheel in a reliable manner to the beam which also serves as a travel rail, a pair of resiliently biased friction rollers are provided, via which the driven running wheel is pulled onto the travel rail. As an alternative, it is described therein that a plurality of the running wheels can be driven via the one traction drive or in each case separate traction drives.
German laid-open document DE 1 803 471 A discloses a crane, on the delivery carriage of which a trolley which is driven by means of a linear motor can be moved. The moving part of the linear motor comprises a traction mechanism which is designed as a belt or chain and is driven by the stationary part of the linear motor formed by induction coils. The traction mechanism of the linear motor drives two wheel axles together with running wheels arranged at both ends on each wheel axle. The traction mechanism is part of the linear motor and is drivingly connected upstream of the two wheel axles, so that both wheel axles are driven together by the traction mechanism.
FR 1 360 309 A describes a traction drive for the crane girder of a bridge crane whose running wheels are drivingly connected by means of a chain-like traction mechanism.
Moreover, German laid-open document DE 10 2010 041 894 A1 discloses a delivery apparatus comprising a trolley whose traction drive has a belt drive.
The present invention provides a trolley of a crane which ensures a reliable transmission of the drive forces between the running wheel and the travel rail.
In accordance with an embodiment of the invention, in the case of a trolley for lifting gear, comprising a lifting mechanism arranged on a support frame and comprising running wheels which are mounted on the support frame and via which the trolley can be moved on a beam and of which at least one first running wheel is mounted on an axle and the axle can be driven together with the running wheel by means of a drive motor, a reliable transmission of the drive forces between the running wheel and the travel rail is ensured by virtue of the fact that the drivable first running wheel is drivingly connected to at least one of the further running wheels via a traction mechanism such that the axle is arranged between the drive motor and the traction mechanism and thus the traction mechanism is drivingly connected downstream of the axle, so that the traction mechanism can be driven by the axle. This embodiment has a simple structural design and, in the case of relatively large spaced intervals between the running wheels, also renders it possible to drivingly connect said wheels in a simple manner and to transmit the corresponding drive forces. The traction mechanism, when designed in a frictionally engaged manner, also prevents any overloading of the running gear unit because the running gear unit will simply slip when overloaded. By driving the trolley by means of at least two running wheels, the drive forces are transmitted more reliably to the travel rail. Therefore, a uniform movement of the trolley can be achieved even in rough operating situations. Slipping of the running wheels and therefore wear thereof are also minimized. Furthermore, the traction mechanism increases the smooth running of the driven running wheels.
In structural terms, it is particularly simple to use the traction mechanism if the driven first running wheel and the at least one of the further running wheels are arranged, as seen in the direction of travel of the trolley, one behind the other and on a common side of the beam.
Provision is made that the second running wheel can be driven by the driven first running wheel via the traction mechanism. As a result, sufficient traction is achieved for the majority of operating scenarios.
In an embodiment, the traction mechanism is designed as a V-ribbed belt. The V-ribbed belt allows the drive forces to be transmitted in a reliable manner and with almost no slip.
In structural terms, provision is made that in each case a traction mechanism disk is drivingly allocated to the driven running wheels and the traction mechanism rotates about the traction mechanism disks.
A particularly compact and simple design is achieved by virtue of the fact that the driven running wheels and the associated traction mechanism disk are formed in each case in one piece. In this case, it is particularly advantageous that the traction mechanism disk adjoins a respective running surface of the driven running wheels.
In an alternative embodiment, provision is made that the driven running wheels and the associated traction mechanism disk are drivingly connected to one another in each case by means of a motor shaft or an axle. The traction mechanism thus extends on the rear side of the first longitudinal beam and thus on the side thereof facing away from the beam. As a result, the traction mechanism drive is protected against any possible soiling caused by the movement of the trolley on the beam.
In order to increase the traction of the driven running wheels, said wheels are acted upon via resiliently biased friction rollers in the direction of the beam serving as the travel rail.
The invention will be explained in greater detail hereinafter with reference to several exemplified embodiments which are illustrated in the drawings.
The intrinsically bending-resistant support frame 5 of the trolley 1 is composed of a plurality of components which will be explained in greater detail hereinafter. As seen in the direction of travel F of the trolley 1 and thus in the longitudinal direction of the beam 2, the support frame 5 is formed in a u-shaped manner. In order to mount the four running wheels 3a, 3b, 3c and 3d in the manner of a vehicle, the support frame 5 has four cuboidal bearing brackets 5a, 5b, 5c and 5d, of which in each case the first and third bearing brackets 5a and 5c which are opposite in relation to the beam 2 are interconnected at their lower ends to a first transverse beam 6a and the opposite second and fourth bearing brackets 5b and 5d are connected at their lower ends to a second transverse beam 6b (see
Furthermore, it is evident in
The lifting mechanism 7 which can be moved by means of the trolley 1 in the direction of travel F thereof and thus in the longitudinal direction of the beam 2 typically consists of an electric lifting motor 7a which acts upon a cable drum 7c via a lifting gear mechanism and is designed preferably as a cable winch. On the whole, the lifting mechanism 7 has a compact c-shaped form. In this case, the lifting motor 7a is arranged below the cable drum 7c, wherein the axes of rotation thereof extend in parallel and in the direction of travel F. The lifting gear mechanism 7b connects the lifting motor 7a and the cable drum 7c to one another at a rear end as seen in the direction of travel F. If the beam 2 is e.g. part of a bridge crane, the beam 2 can be moved transversely with respect to its longitudinal extension by means of traction drives arranged at both ends on the beam 2. As a result, the trolley 1 with the lifting mechanism 7 arranged thereon can then also be additionally moved transversely with respect to the longitudinal direction of the beam 2. Therefore, a movement of the lifting mechanism in the longitudinal direction of the beam 2 by means of the trolley 1 is independent of any additionally possible movement transversely with respect to the longitudinal direction of the beam 2 by means of the possible traction drives for the beam 2.
In order to drive not only the first running wheel 3a but also the second running wheel 3b, the first running wheel 3a and the second running wheel 3b are driving connected to one another by means of a traction mechanism 10. The traction mechanism 10 is guided circumferentially around a first traction mechanism disk 11a and a second traction mechanism disk 11b which are each allocated to the first and second running wheels 3a and 3b and have the same effective diameter. In other words, the traction mechanism 10 is arranged outside of the travel motor 4 and therefore is drivingly connected downstream of the travel motor 4 and the axle, on which the driven first running wheel 3a is mounted, so that the traction mechanism 10 is driven by the corresponding axle. Therefore, the traction mechanism 10 does not drive the axle of the first running wheel 3a but rather is driven thereby. Therefore, by means of the driving connection, the traction mechanism 10 only drives the axle on which the second running wheel 3b is mounted. The first and second traction mechanism disks 11a and 11b can be mounted on the axles of the first and second running wheels 3a and 3b and therefore can be arranged adjacent to the running wheels 3a and 3b or remote therefrom or can be fastened directly to the first and the second running wheels 3a and 3b. In the illustrated exemplified embodiment, the first and second traction mechanism disks 11a and 11b are each an integral component of the first and second running wheels 3a and 3b respectively. The traction mechanism 10 is designed preferably as a V-ribbed belt and the first and second traction mechanism disks 11a and 11b are designed correspondingly as profiled V-ribbed belt disks. It is also feasible to use, as the traction mechanism 10, form-fitting traction mechanisms such as toothed belts and roller chains or frictionally engaged traction mechanisms such as V-belts, flat belts and circular belts. The first and second traction mechanism disks 11a and 11b are then designed in a complementary manner with respect to the traction mechanism 10 selected in each case.
The first and second transverse beams 6a and 6b are also extended beyond the first and third bearing brackets 5a and 5c, in order to accommodate, at their end opposite the lifting mechanism 7, an electric connection box 8.
A detailed view of the trolley 1 shown in
In the case of this third embodiment, the first and second running wheels 3a, 3b are driven together by means of an electric drive motor 4. The drive motor 4 is drivingly connected to the first running wheel 3a by means of a gear mechanism 9 which is flanged-mounted on the right side part 5g. Corresponding to the second embodiment, a first and a second traction mechanism disk 11a, 11b are arranged on the rear side of the first side part 5g and are drivingly connected by means of corresponding shafts to the first and second running wheels 3a, 3b arranged on the opposite side of the first side part 5g. In this case, the first and second traction mechanism disks 11a, 11b are drivingly connected to one another by means of a circumferential traction mechanism 10 designed as a toothed belt. For reasons of clarity, a cover for the traction mechanism 10 and the traction mechanism disks 11a, 11b has been omitted from
The present invention is generally suitable for use with trolleys 1 for lifting gear of any type and not only for the previously described monorail trolley having a short structural form and chain hoists.
Number | Date | Country | Kind |
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10 2014 117 561 | Nov 2014 | DE | national |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2015/077930 | 11/27/2015 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2016/083579 | 6/2/2016 | WO | A |
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Entry |
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International Search Report of the International Searching Authority from corresponding Patent Cooperation Treaty (PCT) Application No. PCT/EP2015/077930, indicated completed on Mar. 15, 2016. |
Written Opinion of the International Searching Authority from corresponding Patent Cooperation Treaty (PCT) Application No. PCT/EP2015/077930, indicated completed on Jun. 2, 2016. |
International Preliminary Examination Report from corresponding Patent Cooperation Treaty (PCT) Application No. PCT/EP2015/077930, dated Oct. 21, 2016. |
Preliminary Report on Patentability of the International Searching Authority in English from corresponding Patent Cooperation Treaty (PCT) Application No. PCT/EP2015/077930, completed Oct. 21, 2016. |
Number | Date | Country | |
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20170327351 A1 | Nov 2017 | US |