DE20207072U1 - Cat on cranes - Google Patents

Description

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Cat on cranes

The innovation relates to a trolley on cranes, preferably for under-flange trolleys, according to the preamble of the first claim.

The innovation can be used wherever trolleys are used on cranes and constraining forces caused by high speeds of the trolley and unevenness in the road surfaces are to be avoided.

Cranes on bridge or container cranes are well known. Under-flange trolleys in particular are characterized by the fact that they are suspended from their tracks, on bridge

MO or container cranes. Such trolleys are described in EP 0 318 264 A1. In order to keep the loads on the trolley track as low as possible, under-flange trolleys are often designed in a lattice construction, which results in low weight but also high rigidity. Examples of such cranes with trolleys in a lattice construction are described in EP 0 167 235 A1. Such trolleys in a lattice construction also emerge from US 005515982 A. The disadvantage of trolleys in a lattice construction, however, is that due to the high rigidity, the forces acting on the outside of the chassis generate constraining forces in the lattice and thus cause mechanical stresses in the lattice, which, depending on the number of load changes that occur, can lead to material fatigue and thus to damage to the lattice.

It is therefore the task of innovation to develop a cat in half-timbered construction, in which

undesirable constraining forces in the framework do not occur or can at least be reduced to a level that is tolerable for the ™ material fatigue.

This problem is solved by an innovation according to the features of the first claim.

Subclaims reflect advantageous embodiments of the innovation.

The proposed solution provides for a trolley on cranes, preferably a lower flange trolley on bridge or container cranes, in which the trolley frame consists of an upper and lower part and the hoist frame is connected to the roof girder of the trolley frame lower part via bars, whereby the construction is characterized by the fact that the roof girder and hoist frame are connected to each other via cross bars in such a way that constraining forces from road surface irregularities are not introduced into the cross bars as normal forces, but as

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Bending moments in the roof beam and hoist frame are reduced. This is achieved by having an articulated connection between the roof beam and the filler bars and by connecting the filler bars to the hoist frame via a rocker.

It is advantageous to connect the front and rear roof supports (with respect to the trolley travel direction) to the front and rear filler bars of the framework, each with a rocker on the main framework frame.

An analogous arrangement of the described components in the side walls, related to the trolley travel direction, is conceivable.

The proposed solution has the advantage that constraining forces, which can result from uneven road surfaces, for example, are transmitted as a bending moment between the roof support and the lifting frame, whereby the stress amplitude in the components from load changes caused by uneven road surfaces, for example, is significantly lower than the stress amplitudes caused by the changing or swelling normal forces in the filler bars which are firmly connected to the roof support and the lifting frame according to the known state of the art, material fatigue is thus avoided and the service life of the components of the trolley frame, in particular the filler bars, is increased.

The innovation is explained in more detail below using an example and two figures. The figures show:

Figure 1: Innovation in perspective view

Figure 2: Detail Z from Figure 1

Figure 1 shows the trolley frame consisting of upper and lower parts 5, 6, whereby the lower part 6 is designed as a framework and consists of filler bars 1 which are connected in an articulated manner to the roof support 2 and whose other end ends in a rocker 3 on which the lifting gear frame 4 is suspended. As the detail Z in Figure 2 shows, two filler bars 1 end in each rocker 3, whereby the connection between the rocker 3 and the lifting gear frame 4 is created via a support plate 7 which is rigidly connected to the lifting gear frame.

The trolley frame upper part 5 has two undercarriage supports with which the trolley travels in the indicated direction of travel 9 on the trolley track of the crane. Additional supports and rods are arranged on the undercarriage supports, which connect the lower part 6 with the two undercarriage supports.

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List of reference symbols used

1 Filling rod 2 roof rack 5 3 Seesaw 4 Hoist frame 5 Cat frame top 6 Cat frame lower part I7 Support plate rocker 10 8 Chassis carrier 9 Direction of travel of the cat 10 Hoist 11 Load handling equipment

Claims (3)

1. Trolley on cranes, preferably under-flange trolley on bridge and container cranes, whereby the chassis consists of an upper and lower part and the hoist frame is connected to the roof support of the chassis lower part via rods, characterized in that - the roof support ( 2 ) and the lifting frame ( 4 ) are connected to one another via cross bars ( 1 ) in such a way that constraining forces from uneven road surfaces are transmitted as bending moments between the roof support ( 2 ) and the lifting frame ( 4 ), whereby - there is an articulated connection between the roof support ( 2 ) and the filling bars ( 1 ) and - the filler bars ( 1 ) are articulated to the lifting frame ( 4 ) via a rocker ( 3 ). 2. Cat according to claim 1, characterized in that two filler bars ( 1 ) connected to the roof support ( 2 ) are connected to a rocker ( 3 ) on the lifting frame ( 4 ). 3. Cat according to claims 1 and 2, characterized in that the filling bars ( 1 ) are arranged in the front and rear walls of the framework lower part ( 6 ).