EP1524235B1 - Crane and method for errecting its jib - Google Patents

Description

The present invention relates to a crane according to the preamble of claim 1.

Such a crane is known from DE-19814636.

The erection of very long arms of cranes such. B. crawler cranes becomes increasingly difficult with increasing boom length, because on the one hand the Aufrichtemoment of the boom lying on the ground is very large, on the other hand, the lever arm of the usually hinged on the superstructure and the Abspannbock Verstellseile with respect to the axis of rotation of the guy or jib is very small. In order to limit the bracing or rope forces when erecting, in principle, the lever arm of the adjusting cables could be improved by the Abspannbock would be further tilted backwards. However, then would the In the case of a steep boom position, ie when the jib is rotated by almost 90 °, the jib rest in the middle of the revolving platform.

The present invention is therefore an object of the invention to provide an improved crane of the type mentioned, which avoids the disadvantages of the prior art and the latter further develops in an advantageous manner. Preferably, on the one hand the erection of the boom easier, on the other hand, the erection of the boom in very steep positions are not hindered.

According to the invention, this object is achieved by a crane according to claim 1.

According to the invention, therefore, the crane is characterized by an angle adjusting device by means of which the angular position of the guy truss can be adjusted relative to the boom when the boom is erected. As a result, for raising the boom, the guy trestle can first be pivoted away from the boom to the rear into an erecting position with a relatively large angle between the guy trestle and the boom. In this erecting position of the guy trestle, the recliner receives an improved lever arm with respect to the pivot point of the guy truss or boom, thereby facilitating the erection of the boom from the position lying on the ground. Once the boom is a bit far, preferably at least 45 ° or more, tipped, the guy block can be pivoted to the boom out in an operating position with a relatively smaller angle between the jib and boom. In this operating position of the guy trestle, the boom can then be tipped even further into very steep positions without the guy truss standing up on the top of the crane's turntable.

The Winkeleinstellvorrichtung for adjusting the angular position of the guy body relative to the boom consists of a length adjustment, by means of which the length of the bracing between jib and boom can be adjusted. The length adjustment device can basically be designed differently. It would be conceivable to form the articulation point of the bracing on the boom displaceable or form the bracing as a rope and to redirect the guying trestle and attach adjustable there with a winch or a power lift and a cable lock. The Längeneinstellvorrichtung may consist of a built-in the bracing Fremdsexiebetätigbaren traction means by means of which the actual length of the bracing can be changed, ie the bracing can be extended or shortened. In particular, a hydraulic power lift and / or an adjusting bottle can be installed in the bracing.

Said Längeneinstellvorrichtung can be installed between the tip of the jib and the boom in the bracing. The bracing can thereby be struck firmly on the one hand on the guy trestle and on the other hand on the boom.

The adjusting device, by means of which the boom can be swiveled up and down, can comprise an adjusting cable which is reeved several times between the superstructure on the one hand and the guy truss on the other hand. For rocking the boom, the adjusting device is shortened, whereby the boom is pivoted upwards, the guy block is pivoted synchronously to the rear. If the Verstellseil decreased and thereby extended the adjustment, the boom is tapped off, with the Abspannbock synchronously pivots.

In order to achieve favorable leverage, the guy is so adjustable between an upright position and an operating position, with erected boom, wherein in the erect position of the guy trestle occupies a larger angle to the boom than in the operating position. This angle between jib and boom can be sized differently both in the erect position and in the operating position, on the one hand to achieve optimum leverage ratios on different geometries and on the other hand the Rocker area of the boom to be sized sufficiently large. According to an advantageous embodiment of the invention, the Abspannbock occupy an angle of 90 ° or more to the boom in the erect position, while occupying an angle of less than 90 ° to the boom in the operating position. According to a favorable embodiment, it can be provided that the guy block assumes an angle of about 100 ° to the boom in the erecting position.

Fig. 1:

eine schematische Seitenansicht eines Krans mit noch am Boden liegendem Ausleger, wobei ein Abspannbock, über den die Abspannung des Auslegers geführt ist, noch in einer Grundstellung ist, die der Betriebsstellung entspricht,

Fig. 2:

eine schematische Seitenansicht des Krans aus Fig. 1, wobei der Abspannbock in eine Aufrichtestellung nach hinten geschwenkt wurde, um für das Aufrichten des Auslegers günstige Hebelverhältnisse zu erreichen,

Fig. 3:

eine schematische Seitenansicht des Krans aus den vorhergehenden Figuren, wobei der Ausleger bereits ein Stück weit aufgerichtet wurde, der Abspannbock jedoch noch nicht in seine Betriebsstellung geschwenkt wurde, und

Fig. 4:

eine schematische Seitenansicht des Krans aus den vorhergehenden Figuren, wobei der Ausleger gänzlich steil aufgerichtet ist und der Abspannbock zum Ausleger hin in seine Betriebsstellung geschwenkt wurde.

The invention will be explained in more detail with reference to a preferred embodiment and associated drawings. In the drawings show:

Fig. 1:

a schematic side view of a crane with still lying on the ground boom, with a Abspannbock over which the bracing of the boom is guided, is still in a normal position, which corresponds to the operating position,

Fig. 2:

a schematic side view of the crane of Figure 1, wherein the guy block was pivoted in an upright position to the rear, in order to achieve favorable leverage for raising the boom,

3:

a schematic side view of the crane from the preceding figures, wherein the boom has already been erected a bit, but the brace has not been pivoted to its operating position, and

4:

a schematic side view of the crane from the preceding figures, wherein the boom is erected completely steep and the guy clamp was pivoted to the boom in its operating position.

The crane shown in the figures comprises an undercarriage 1, which comprises a chassis 2 in the form of a crawler track with two parallel, right and left from each other spaced chains comprises. On the undercarriage 1 is rotatable about an upright axis of rotation 3, a superstructure or a revolving stage 4 is mounted, which carries at its front end a boom 5, on the top in a conventional manner a hoist runs off. The boom 5 is pivoted about a substantially horizontal rocking axis 6 rocking on the turntable 4, at the front end. At the boom 5 opposite the rear end of the revolving stage 4, a ballast 7 is arranged on the revolving stage 4, which counteracts the induced by the boom 5 moment.

On the boom 5, a brace 8 is fixed, which is posted on the jib tip and / or between the jib tip and the articulated on the revolving platform 4 boom base on the boom 5. On the other hand, the bracing 8 is hinged to the tip of a guy trestle 9, which is also hinged to the pivoting platform 4 in the region of the articulation point of the boom 5, namely about an axis parallel to the rocking axis 6 axis of rotation at the top of 9 Abspannbocks on the other hand Verstellverseilung 11 hinged, which has a multiple reed Verstellseil and runs on a Wippwerkwinde 12, which is provided on the revolving platform 4. The Verstellverseilung 11 runs between the Abspannbockspitze and the rear end of the revolving stage 4 and a ballast associated therewith and serves the up and teetering of the boom 5. It is understood that in addition to the Drehbühnenballast 7 an additional ballast connected to the revolving stage 4 attached to it. The Verstellverseilung could possibly also be associated with this additional ballast.

In the bracing 8 a Längeneinstellvorrichtung 12 is installed in the form of a traction device. In the illustrated embodiment, in which the bracing 8 is struck on the one hand on the boom 5 and on the other hand at the top of the guy trestle 9, the Längeneinstellvorrichtung 12 is installed between Abspannbockspitze and boom in the bracing 8. The length adjustment device 12 may consist of a hydraulic cylinder and / or an adjusting bottle. It forms an adjusting member, the effective length of which can be changed, which in turn allows the length of the bracing 8 between guy brace and boom to be changed.

To raise the boom 5, the length adjustment device 12 can be used as follows:

When the boom 5 is still lying on the ground, the guy truss 9 is initially in its forwardly pivoted to the boom 5 operating position. The Längeneinstellvorrichtung 12 is in its short position, so that the Abspannbock 9 to the boom 5 occupies an angle of less than 90 °, which is approximately between 70 ° and 80 ° in the illustrated embodiment. In this position, the Verstellverseilung 11 has a relatively unfavorable lever arm 13, as Figure 1 shows. In order to improve the lever arm 13 with respect to the rocking axis 6 and the pivot axis 10, the Längeneinstellvorrichtung 12 is then brought into its long position, whereby the Abspannbock 9 is pivoted backwards from the boom 5, as Figure 2 shows. In this erect position, the guy truss 9 has a larger angle to the boom 5, which is more than 90 °, in particular about 100 ° in the illustrated embodiment. In the erecting position of the guy truss 9, the Verstellverwickung 11 has a better, i. longer lever arm 13 with respect to the pivot axes of the boom 5 and the Abspannbocks 9, so that the introduced by the Verstellverseilung 11 forces exert on the boom 5, a larger torque. The boom 5 can thereby be erected with less force in the Verstellverseilung 11.

In this case, the boom 5 is initially erected until the guy truss 9 is about to queuing at the top of the revolving stage 4 or the ballast 7, as shown in FIG. In order to be able to continue tapping the boom 5, the length adjustment device 12 is then moved to its short position. The bracing 8 is thus shortened, whereby the brace 9 is pivoted relative to the boom 5 out. In this operating position, the figure 4 shows, the angle between Abspannbock 9 and boom 5 is correspondingly smaller, preferably smaller than 90 °. As a result, the boom 5 can be flipped even further without the guy clamp 9 abutting the revolving platform upper side or the ballast 7.

Claims (3)

1. A crane comprising a slewing platform (4) which is slewable about an upright axis (3), a jib (5) which is articulated such that it is able to seesaw about a luffing axis (6), a guying (8) which is connected, on the one hand, to the jib (5) and, on the other hand, to a guying frame (9) being articulated to the slewing platform (4) and/or to the jib foot such that it is slewable about an axis (10) which is parallel to the luffing axis (6) of the jib (5), and an adjusting device (11) for seesawing the jib (5) up and down which acts upon the guying frame (9), wherein, in operation, the jib (5), by means of the adjusting device (11), can be seesawed up and down synchronously with the guying frame (9) which is held in a predetermined angle position relatively to the jib (5) by the guying (8),
   characterized in that
   between the guying frame (9) and the jib (5), a hydraulic cylinder (12) is fitted to the guying (8), by means of which the length of the guying (8) and thus, with the jib (5) being erected, the angle position of the guying frame (9) relatively to the jib (5) can be adjusted such that the guying frame (9) takes, in an erection position for erecting the jib (5), a greater angle relatively to the jib (5) than in its operating position.
2. The crane according to the preceding claim, wherein the adjusting device (11) for seesawing the jib up and down includes an adjusting rope reeved multiple times which is articulated, on the one hand, at the slewing platform (4) and, on the other hand, at the guying frame (9).
3. The crane according to any one of the preceding claims, wherein the guying frame (9), in its erection position, takes an angle of 90° or more relatively to the jib (5) and, in its operating position, takes an angle of less than 90° relatively to the jib (5).

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