EP3356281B1 - Mobile crane and method for angling a main jib extension relative to a main jib of a mobile crane - Google Patents

Description

The invention relates to a mobile crane with a rocker mounted thereon and erectable via a luffing cylinder main boom and with a detachably connected to a main boom head of the main boom on top and bottom bolts main boom extension, the main boom extension starting from a normal position after loosening the upper or lower bolt by means of a Abwinkelantriebs about a Wippachse relative to the main boom is angled, the Abwinkelantrieb is part of a combination Abwinkellasche which limits a maximum angle of deflection mechanically adjustable, the Abwinkelantrieb acts on one foot of the main boom extension and the main boom head and combi Abwinkellasche from a sliding tab, a guide tab and the Abwinkelantrieb exists.

The invention also relates to a method for bending a main boom extension relative to a main boom of a mobile crane.

From the German utility model DE 20 2004 020 760 U1 There is already known a mobile crane with a main boom and a main boom extension attached to its main boom head. The main boom extension is tiltable from a home position in which the main boom extension is aligned with its longitudinal direction in extension of the longitudinal direction of the main boom in a 20 ° position and a 40 ° position. The main boom extension is detachably secured to the main boom head via two lower bolts located in the region of lower boom of the main boom extension and two upper bolts located in the region of upper boom of the main boom extension. In order to be able to rock the main boom extension out of the basic position by the lower two bolts serving as the rocker axis, in a first step the two upper bolts are pulled and in a second step the rockers are actuated via hydraulic luffing cylinders which engage the main boom head and the main boom extension the main boom extension causes. The two upper pins are inserted and removed via a hydraulic bolting cylinder. To supply the luffing cylinder and the bolting cylinder is a self-sufficient hydraulic power unit arranged at the lower end of the main boom extension. As a hydraulic unit, for example, a diesel engine or electric motor can be used in each case with an associated hydraulic pump.

Also is from the German patent specification DE 103 21 493 B4 a mobile crane with a main boom extension and a Abwinkellasche known. The Abwinkellasche is designed as mechanically lockable telescopic device with a tubular guide tab and a guided therein and extendable sliding tab, which is also tubular. The guide tab has stop apertures for receiving bolts which provide support for the slide tab at its lower end and thus provide a preselected length of the angled tab and thus angular adjustment of the main boom extension. The Abwinkellasche is located in the region of a lower flange of the main boom and the main boom extension. The desired angulation is achieved by lifting the main boom, thereby shortening the angled tab until the sliding tab hits and is supported on the bolt.

In addition, the European patent application discloses EP 2 253 576 A1 another embodiment of an Abwinkelellasche for bending a main boom extension of mobile cranes. The formed from two angle levers Abwinkellasche has in its basic position corresponding to a 0 ° position of the main boom extension to the main boom, a plurality of pairs of aligned stop openings for bolts. Through a choice of a pair of stop holes for the bolts, the length of the angle bracket can be varied and the main boom extension in various angular positions, preferably 0 °, 20 ° and 40 °, set. The actual Abwinkelbewegung the main boom extension is done by means of a hoist located on the crane or next to the crane.

The European patent application EP 1 081 088 A1 relates to a telescopic crane with a main boom and a hydraulic cylinder for rocking the main boom relative to the telescopic mast of the telescopic crane.

The German patent application DE 10 2014 003831 A1 describes a crane system with a main boom and a luffing jib, wherein an adjusting drive is used for rocking the luffing jib. The adjustment drive is over Adapter attached to the main boom and the luffing jib and is designed as an electric or hydraulic motor and explicitly not as a hydraulic cylinder.

Further, the Japanese patent application JP H09 104 588 A a mobile crane with a main boom and a main boom extension, which is angled by means of a designed as a hydraulic cylinder Abwinkelantriebs. The Abwinkelantrieb is mounted between the crane boom and a sliding bolt. By sliding the sliding bolt through a slot in a guide tab, a tilt angle is set.

The invention has for its object to provide a mobile crane and method for bending a main boom extension relative to a main boom of a mobile crane, with which the bending of the main boom extension is simplified.

This object is achieved by a mobile crane having the features of claim 1 and by a method having the features of claim 13. Advantageous embodiments of the invention are specified in the subclaims 2 to 12 and 14.

According to the main boom extension, the main boom extension, starting from a basic position by means of a Abwinkelantriebs about a Wippachse relative to the main boom in a mobile crane with a rockable mounted thereon and erectable via a luffing jib Hauptauslegerverlängerung be bent relative to the main boom is the Abwinkelantrieb part of a combination Abwinkellasche that limits a maximum angle of deflection mechanically adjustable, the Abwinkelantrieb acts on a foot of the main boom extension and the main boom head and the combination Abwinkelellasche consists of a sliding tab, a guide tab and the Abwinkelantrieb and thereby simplify achieved that the combination Abwinkelellasche is variable in length over the Abwinkelantrieb, and the Abwinkelantrieb drivingly on the one hand on the sliding latch and on the other hand on the F attacks currency lax and over the Abwinkelantrieb the sliding clip relative to the guide plate is variable in length displaceable. Advantageously, thus, a known passive mechanical limiting Abwinkellasche is converted into a hydraulically assisted combination Abwinkellasche, which also provides the mechanical limit. The integration of the Abwinkelantriebes in the combination Abwinkellasche no additional force application points on the main boom head or the main boom extension are required. The bending itself is largely at the bottom or the storage position of the main boom, so that it is not necessary to work well above the top of the mobile crane. The invention allows the bending of the main boom extension with standing on a flat ground mobile crane with horizontally aligned telescopic boom. For the last part of the whip extension of the main boom extension into a 20 ° or 40 ° position, the luffing cylinder of the main boom is used. Since the extension of the hydraulic cylinder of the Abwinkelantriebs can be chosen freely, can be configured relatively independent of terrain at a longer chosen extension path of the Abwinkelantrieb.

Since the combi-angled tab engages the main boom extension in the area of the foot, there is no need for a fork head offset between the main boom and the main boom extension which compensates for deformation of the main boom extension. This is especially important for long narrow boom systems. Also, this does not require an auxiliary cylinder over which a fork head offset must be compensated.

In order to use the combi Abwinkellasche as passive or active Abwinkellasche as needed, the Abwinkelantrieb is releasably attached to the sliding latch.

Particularly space-saving is that the sliding tab is guided displaceably in the guide plate and the Abwinkelantrieb is arranged in the guide plate. It is also provided that a maximum displacement of the sliding lug to the guide plate can be limited via a stop pin.

In particular, it is provided that the rocking axis in the region of the upper belt of the main boom extension or the lower chord of the main boom extension is formed and the combination Abwinkelellasche is located in the region of the lower flange of the main boom extension or the upper belt of the main boom extension.

It is preferably provided that the combination Abwinkellasche attacks on the one hand on the main boom head and on the other hand on the main boom extension. In this case, in particular the Abwinkelantrieb is designed such that the main boom extension against the gravitational force of the main boom extension about the rocking axis is pivotally raised and lowered.

It is particularly advantageous that the Abwinkelantrieb is designed as a hydraulic cylinder with housing and rod.

In a preferred embodiment, it is provided that two combination Abwinkellaschen are arranged parallel and spaced from each other and the two combination Abwinkellaschen are preferably arranged in corner regions of the main boom extension. Advantageously, the combination Abwinkellasche replaced a part of the upper chord or the lower chord of the main boom extension in the foot of the main boom extension.

Particularly preferably, the sliding lance is pivotally mounted on the main boom head, the guide lug pivotally mounted on the main boom extension and limited by a plug-in stop pin a maximum displacement of the sliding lug in the guide lug.

According to the invention, in a method for bending a main boom extension relative to a main boom of a mobile crane, in particular a mobile crane described above, wherein the main boom is tiltably mounted on the mobile crane and erectable via a luffing cylinder, the main boom extension is releasably connected to a main boom head of the main boom, an angled drive to a foot of the main boom extension and acts on a main boom head, a simplification achieved by means of the Abwinkelantriebs, which is part of a combination Abwinkellasche which limits a maximum angle of deflection mechanically adjustable and on the Abwinkelantrieb is variable in length, the main boom extension is raised starting from a basic position about a rocking axis relative to the main boom, as far as a locking pin is relieved for a 0 ° position within the combination Abwinkelellasche, then the locking bolt is removed, then if not done so far Abwinkelantrieb is drivingly coupled with the combination Abwinkellasche, by means of the Abwinkelantriebs the main boom extension is lowered until the maximum Abwinkelstellung is reached or a head of the main boom extension on a floor to rest, the Abwinkelantrieb is drivingly separated from the combination Abwinkellasche and if the maximum Abwinkelstellung is not reached, by raising the main boom, the main boom extension is angled until reaching the desired angle of deflection. With regard to the advantages associated with this, reference is made to the statements above for the mobile crane.

Preferably, it is provided that after disconnecting the Abwinkelantriebs in the combination Abwinkelellasche a stop pin is inserted and the maximum extension of the combination Abwinkellasche and thus the maximum angle of attack, preferably 20 ° or 40 ° is limited by the stop pin.
In the context of the present invention, a mobile crane is understood as meaning both a mobile telescopic crane and a movable crawler crane with a lattice boom.

• Figur 1 eine Seitenansicht einer Hauptauslegerverlängerung in einer Grundstellung an einem Hauptausleger,
• Figur 2 eine Detailansicht von Figur 1 aus dem Bereich der Ankopplung der Hauptauslegerverlängerung an den Hauptausleger,
• Figur 3 eine Explosionsdarstellung einer Kombi-Abwinkellasche aus Figur 2,
• Figur 4a eine Detailansicht auf eine Kombi-Abwinkellasche in der Stellung gemäß Figur 1,
• Figur 4b eine Ansicht von Figur 4a mit Schiebelasche und Führungslasche nebeneinander,
• Figur 5 den Hauptausleger nach Figur 1 mit der Hauptauslegerverlängerung in einer 15°-Stellung,
• Figur 6a eine Detailansicht auf eine Kombi-Abwinkellasche in der Stellung gemäß Figur 5,
• Figur 6b eine Seitenansicht von Figur 6a mit Schiebelasche und Führungslasche nebeneinander,
• Figur 7 den Hauptausleger nach Figur 1 mit der Hauptauslegerverlängerung in einer 40°-Stellung,
• Figur 8a eine Detailansicht auf eine Kombi-Abwinkellasche in der Stellung gemäß Figur 7 und
• Figur 8b eine Seitenansicht von Figur 9a mit Schiebelasche und Führungslasche nebeneinander.

The invention will be explained in more detail with reference to an embodiment shown in a drawing. Show it:

• FIG. 1 a side view of a main boom extension in a basic position on a main boom,
• FIG. 2 a detailed view of FIG. 1 from the area of the coupling of the main boom extension to the main boom,
• FIG. 3 an exploded view of a combination Abwinkellasche FIG. 2 .
• FIG. 4a a detailed view of a combination Abwinkellasche in the position according to FIG. 1 .
• FIG. 4b a view of FIG. 4a with sliding tab and guide tab side by side,
• FIG. 5 after the main boom FIG. 1 with the main boom extension in a 15 ° position,
• FIG. 6a a detailed view of a combination Abwinkellasche in the position according to FIG. 5 .
• FIG. 6b a side view of FIG. 6a with sliding tab and guide tab side by side,
• FIG. 7 after the main boom FIG. 1 with the main boom extension in a 40 ° position,
• FIG. 8a a detailed view of a combination Abwinkellasche in the position according to FIG. 7 and
• FIG. 8b a side view of Figure 9a with sliding tab and guide tab side by side.

In the FIG. 1 is a side view of a main boom extension 1 in basic position on a main boom 2 shown. The main boom 2 is designed as a telescopic boom with a base box 2 b and corresponding telescopic shots 2 c. At the free end of the innermost telescopic section 2c, a main boom head 2a is provided. The main boom 2 is part of a telescopic crane, not shown, and is in the usual way via a hydraulic rocker cylinder 7, which is supported on an upper carriage 8 of the telescopic crane, erectable. The superstructure 8 is only by a frame part thereof in FIG. 1 indicated. In the FIG. 1 the main boom extension 1 and the main boom 2 are shown in a so-called stowed position, in which the main boom extension 1 with its longitudinal direction v and the main boom 2 with its longitudinal direction h are aligned substantially horizontally. A so-called rocking angle a of the main boom 2 relative to the superstructure 8 is thus in the Stored position 0 °. With the rocking angle a, the erection of the main boom 2 relative to the superstructure 8 is described. On the main boom head 2a, the main boom extension 1 is releasably secured via a bolt connection. The main boom extension 1 can be used temporarily or permanently with the telescopic crane to achieve an even greater overall length of the boom beyond the largest boom length of the main boom 2.

This main boom extension 1 is divided into a lattice boom designed basic boom 1a, which is a truss pipe construction in the usual way, and a subsequent tip 1b, which is designed as a box boom. The main boom 2 and the main boom extension 1 are located in the FIG. 1 in a 0 ° position or basic position in which the longitudinal direction h of the main boom 1 and the longitudinal direction v of the main boom extension 1 are aligned with one another or run parallel to one another. A corresponding angle of deflection b is therefore 0 °. The main boom extension 1 is tiltable to the main boom 2 about a luffing axis w, which is formed by a lower roll head axis. The main boom extension 1 is spaced in this basic position of a bottom 3 with first to third floor levels 3a to 3c and is thus from the main boom 2 via the bolt connections in corresponding Verbolzungsstellen A, B, C and D (see FIG. 2 ) is carried on the main boom head 2a.

Such main boom extensions 1 are basically constructed as modular systems of individual main elements and can be assembled according to the requirements of their length or load capacity. The individual main elements have transportable dimensions and are not carried along with the telescopic crane in most cases, but are transported separately. If the axle loads of the telescopic crane and the size of the main boom extension 1 allow it, the main boom extension 1 can be carried if necessary. This would then be in a transport position laterally next to and parallel to the main boom 2. A connection of the individual main elements together to the desired main boom extension 1 via bolt connections. Attachment to the main boom head 2a may be either elementary or as a preassembled unit or units.

The FIG. 2 shows a detail view of FIG. 1 From the field of coupling the main boom extension 1 to the main boom 2. The in the usual way having a rectangular cross-section main boom extension 1 is four arranged in the corner regions of the main boom extension 4 bolt connections at Verbolzungsstellen A, B, C and D to the main boom 2 and optionally one additional bolting point G attached. The lower right-hand bolted connection at the bolting point C is concealed by the main boom 2, but formed identically to the bolted connection at the bolting point D.

The two lower bolt connections in the bolting points C and D are designed as a so-called two-pin bolt connection, which is constructed in a corresponding manner substantially from a forked tongue 4a, a lug 4b and a bolt 4c. The forked tongue 4a with its two opposite holes for the bolt 4c is fastened respectively in the two bolting points C and D to a foot 1c of the main boom extension 1 and in extension of the lower belt 1e of the main boom extension 1. In this case, the holes in the fork lug 4 a are aligned vertically with horizontal main boom extension 1. The tab 4b is attached to the main boom head 2a via a lower roller head axle 9a. The lower roller head axle 9a is aligned horizontally and transversely to the longitudinal direction of the main boom 2 with the main boom head 2a oriented horizontally and rotatably supported in the main boom head 2a. Correspondingly, in each case the tab 4b is also rotatable about the horizontal lower roller head axle 9a. Also, the tab 4b has a bore which is aligned in the mounted position of the main boom extension 1 with the holes of the fork lug 4a. In the holes of the tab 4b and the fork lug 4a, a bolt 4c is inserted to fix the main boom extension 1 to the main boom head 2a in a corresponding manner.

Instead of the present in this construction of the main boom 2 lower roller head axle 9a could also be an extra for the connection of the main boom extension 1 provided axis, which is rotatable and aligned according to the above-described roller head axle 9a.

Also, the tab 4b can be attached directly and thus non-rotatably to the main boom head 2a. In order to achieve a rockability of the main boom extension 1 relative to the main boom 2, then the bore for the bolt 4c in the tab 4b must be aligned horizontally.

In the region of the upper belt 1d the connection of the main boom extension 1 in the Verbolzungsstellen A and B indirectly via two parallel and spaced apart in the corners of the main boom extension 1 extending combination Abwinkellaschen 6. The combination Abwinkellaschen 6 are facing away from the main boom head 2a End connected via further bolt connections in Verbolzungsstellen E and F with the foot 1c of the main boom extension 1. In a so-called 0 ° position with respect to the angle of deflection b, each of the two combination angle brackets 6 has the function of a rigid rod, each with a connecting bore 6r at the end facing the main boom 2 and a connecting bore 6s at the end facing the main boom extension. The combi Abwinkellaschen 6 extend with their longitudinal directions c substantially parallel to the longitudinal direction v of the main boom extension 1. The bolt connections in the Verbolzungsstellen A and B are formed as a so-called two-pin bolt connection. In this case, there is a fork lug 4a on the main boom head 2a and a lug 4b is formed by one end of the combination Abwinkellasche 6 in the region of the connecting hole 6r. The fork lug 4a has two opposite holes for the bolt 4c. In this case, the holes in the fork lug 4 a are horizontally aligned with horizontal main boom extension 1. Also, the tab 4b has a bore which is aligned in the mounted position of the main boom extension 1 with the holes of the fork lug 4a. In the holes of the tab 4b and the fork lug 4a, a bolt 4c is inserted to fix the main boom extension 1 to the main boom head 2a in a corresponding manner.

At the end opposite the main jib head 2a, each of the combination jaw flaps 6 is connected to the foot 1c of the main boom extension 1 via a further two-pin bolt connection in the bolting points E and F. Each of the two bolt connections is characterized by a fork lug 10a, which on the foot 1c of the main boom extension 1 in Extension of the upper belt 1d is arranged. The fork lug 10a is similar to the fork lug 4a previously described in connection with the lower chord 1e, but the opposing holes of the fork lug 10a are not vertically but horizontally aligned. An engaging in the fork lug 10a and also designed as a fork lug tab 10b is disposed on the main boom extension 1 facing the end of the combination Abwinkellasche 6. In the usual way, the fork lug 10a and the tab 10b are connected to each other via a bolt 10c, which is aligned horizontally.

In addition, the FIG. 2 can be seen that the combination Abwinkellasche 6 is formed of a sliding tab 6b and a guide plate 6d, which are pushed together and against each other. Here, the angled drive 6j is disposed in the sliding latch 6b between two sliding shackle parts 6b 'and 6b. "As described above, the figure shows the 0 ° position in which the sliding shackle 6b and the guide shackle 6d are engaged with each other via a lock bolt 6t and a stopper bolt 6h are locked.

Since the combination Abwinkelellaschen 6 are respectively integrated into the foot 1c of the main boom extension 1, the Bolting points C, D, E and F are with the lower and upper fork flaps 10a in a vertical from - seen in horizontally aligned main boom extension 1 - to the head 1f the main boom extension 1 tilted connection plane. In other words, the upper straps 1d at the foot 1c of the main boom extension 1 are shorter than the lower straps 1e at the foot 1c of the main boom extension 1, and the upper fork straps 10a are recessed from the lower fork straps 10a. The thus specially trained foot 1c of the main boom extension 1 can also be formed as a foot segment, which can then be followed by other substantially cuboid segments of the main boom extension 1.

With regard to other functions of the main boom extension 1 in addition to the above-described Abwinkelbarkeit it may be advantageous to provide in addition to the above Verbolzungsstellen A to F nor a further Verbolzungsstelle G, in the region of the upper chord 1d of the main boom extension 1, in a vertical plane with the Verbolzungsstellen and D and on one of the two sides of the main boom extension 1 is arranged. This additional Verbolzungsstelle G can then serve depending on the side with one of the Verbolzungsstellen C and D as a vertical axis in order to fold a main boom extension 1 in a transport position parallel to the main boom 2 can.

In order to be able to angle the main boom extension 1 relative to the main boom head 2a or main boom 2, the two upper locking bolts 6t are provided at the bolting points A and B in the area of the upper belt 1d of the main boom extension 1 or on the end facing the main boom head 2a and in extension of the Obergurts 1d of the main boom extension 1 arranged combi Abwinkellaschen 6 to pull, so that the main boom extension 1 relative to the main boom 2 to the lower roller head axis 9a in the lower Bolting points C and D in the region of the lower chord 1e of the main boom extension 1 by the angle b can bend. In addition, it may be necessary to pull a bolt 10c in an upper bolting point G on the right side of the main boom extension 1. This bolt 10 c is required to pivot the main boom extension 1 horizontally in a transport position can. The lower roller head axle 9a thus forms the rocking axis w. The angle of deflection b is usually in the range of 0 ° to 40 °. In order to be able to limit the angle of deflection b or to be able to set it to the usual values of 20 ° and 40 angle of deflection, the two variable-length combination bending-angle tabs 6 are provided.

In the FIG. 3 an exploded view of a combination Abwinkellasche 6 is shown. The active combi Abwinkelellasche 6 consists essentially of a sliding tab 6b, a guide plate 6d and a Abwinkelantrieb 6j.

The sliding lug 6b, which has at its end facing the main boom head 2a the tab 4b with the connecting hole 6r, begins at this end flat profile and extends about a quarter of its length box-shaped with two parallel and spaced-apart flat profile-shaped and side Schiebelaschenteilen 6b ', 6b. "This box-shaped formation is provided to receive therebetween the hydraulic cylinder-formed angled drive 6j. Each of these sliding-plate portions 6b ', 6b" has, starting from the main boom head 2a, a lock hole 6m for the 0 ° -position of the main boom extension 1 at the beginning thereof spaced a bore-shaped first stop opening 6c 'for a 20 ° position of the main boom extension 1 and in turn spaced a second slot-shaped stop opening 6c for a 40 ° position of the main boom extension 1. The stopper openings 6c and 6c' each have on their main boom extension 1 side facing a semicircular stop surface 6a, 6a 'for a stop pin 6h. The right locking hole 6c ', 6o for the 0 ° position of the main boom extension 1 also serves as a hole for releasably securing the free end of a rod 6l of the Abwinkelantriebs 6j, if the Abwinkelantrieb 6j is needed. The Indian FIG. 3 Locking bolt 6t shown in relation to sliding block 6b is required only in the 0 ° position of main boom extension 1, is removed for a start of angling and can be reinserted into locking hole 6m for easy storage once the main boom extension 1 has been bent slightly Guide tab 6b is no longer in the region of the locking hole 6m with its stop opening 6g.

Also, a guide plate 6d is shown in addition to the sliding plate 6b, in which the sliding plate 6b is inserted and guided displaceably. Correspondingly, the guide lug 6d is also box-shaped with a central rectangular guide opening 6f and mutually parallel and spaced apart first and second guide lug parts 6d 'and 6d. "In the guide lug parts 6d' and 6d" there is a slot-shaped stop opening 6g respectively opposite one another. The stop opening 6g has at the ends opposite abutment surfaces 6i, 6i ', at which abut the stop pin 6h or the locking pin 6t in the 0 °, 20 ° -beziehungsweise 40 ° position.

Furthermore, in the FIG. 3 the Abwinkelantrieb 6j shown in the form of a single hydraulic cylinder with a housing 6k and a rod 6l. At the free end of the rod 6l a connecting element 6n is fixed with a bore to connect the hydraulic cylinder via a stop pin 6h, if necessary, with the locking hole 6o of the sliding tab 6b if necessary. At the opposite end, the housing 6k of the hydraulic cylinder is connected together with the guide tongue 6d in the attachment point E or F on the tab of the foot 1c of the main boom extension 1 with the bolt 10c. The hydraulic cylinder can be connected, for example, to existing hydraulic circuits become. Basically, this is the hydraulic circuit of a Beiziehzylinders for horizontal pivoting a entrained main boom extension from a transport position out.

The Abwinkelantrieb 6j is dimensioned so that only the weight of the main boom extension 1 can be off or angled.

In the 0 ° position thus form the two combination Abwinkellaschen 6 a part of the foot 1c of the main boom extension 1. In this way are then the upper and lower Verbolzungsstellen A, B, C, D in a plane which extends vertically with horizontally oriented main boom extension 1 ,

The FIG. 4a shows a detailed view of an assembled combi Abwinkellasche 6 according to FIG. 2 in the locked 0 ° position. In the 0 ° position, the sliding lug 6b and the guide lug 6d are fixed relative to the longitudinal direction c via a locking bolt 6t and a stop pin 5h. The lock bolt 6t and the stopper bolt 6h are inserted into the stopper hole 6g, and the lockup bolt 6t abuts against the front stopper surface 6i 'and the stopper bolt 6h abuts the rear stopper surface 6i (see FIG FIG. 3 ). Even in the 0 ° position, the stop pin 6h may already be in engagement with the connecting element 6n on the rod 6l of the hydraulic cylinder, so that the angled drive 6j is already drivingly connected to the combination bending angle 6.

In the FIG. 4b is a view according to FIG. 4a shown, in which the sliding plate 6b and guide tab 6d are built apart and thus shown side by side. From this view, it can be clearly seen that in the 0 ° position the right locking bolt 6t and the left stop bolt 6h pass through the stop opening 6g in the guide lug 6d through the locking holes 6o, 6m.

The following is an angling of the in the normal position or 0 ° position according to FIG. 1 located main boom extension 1 in a 40 ° position on the basis of FIGS. 1 to 8 , in particular FIGS. 5 to 8 , explained. In a first step, the Abwinkelantrieb 6j, with its housing 6k together with the guide plate 6d on the bolt 10c on the fork lug 10b the main boom extension 1 is fixed, connected to the sliding tab 6b, provided that the Abwinkelantrieb 6j hereby not yet connected via the stop pin 6h. For this purpose, the stop pin 6h is pulled and the retracted Abwinkelantrieb 6j extended until the hole in the connecting element 6n with the locking hole 6o and the stop opening 6g aligned. Then the stop pin 6h is put back. This situation is in FIGS. 4a and 4b shown. Then the Abwinkelantrieb 6j is actuated and the rods 6l of the hydraulic cylinder retracted a little so that the sliding plates 6b are pulled relative to the guide plates 6d in the direction of the main boom extension 1 and the distance between the Verbolzungsstellen A, B and E, F decreases and the Main boom extension 1 on the arranged in the lower region of the lower belt 1e lower roller head axes 9a of the Verbolzungsstellen C, D slightly upwards. As a result, the main boom extension 1 is slightly raised, so that the locking pin 6t be relieved in the combination Abwinkellaschen 6. Relieved is also the pin 10c in joint G between the main boom extension 1 and the main boom head 2a, which serves to pivot in or out of the transport position. This bolt 10c is also removed in the unloaded 0 ° position so that it is not in the later power flow when lifting loads. The now relieved locking bolt 6t and the bolt 10c in joint G are then removed. The main boom extension 1 is now supported via the two lower pins 4c in combination with the two combination Abwinkellaschen 6 on the main boom 2 and the Abwinkelantrieben 6j. The lower roller head axle 9a thus forms the teetering axle w for the angling of the main boom extension 1.

In a next step, the Abwinkelantriebe 6j are operated again and the rods 6l of the hydraulic cylinder slowly extended. As a result, the sliding lugs 6b are pushed relative to the guide lugs 6d in the direction of the main boom 2, so that the distance between the Verbolzungsstellen E, F and A, B increases and the main boom extension 1 via the arranged in the region of the lower chord 1e lower roller head axis 9a of the bolting C, D pivots by the angle of deflection b. By this Abwinkelbewegung the head 1 f of the main boom extension 1 lowers in the direction of the bottom 3 until it touches the bottom 3.

In the FIG. 5 following the main boom extension 1 FIG. 1 is shown in a 15 ° position, the position described above is shown, in which the lowered head 1f is supported on the bottom 3, but the Abwinkelantrieb 6j is still coupled. The rocking angle a of the main boom 2 is still 0 °.

The FIG. 6a shows a detailed view of the combination Abwinkellasche 6 in the 15 ° position according to FIG. 5 , It is shown that the rod 6l of the hydraulic cylinder is extended far and the connecting element 6n is still connected via the stop pin 6h with the sliding tab 6b.

In the FIG. 6b is a view according to FIG. 6a shown, in which the sliding plate 6b and guide tab 6d are built apart and thus shown side by side. From this view, it can be clearly seen that in the 15 ° position the right locking bolt 6t is inserted only for storage purposes and without function and the left stop pin 6h passes through the stop opening 6g in the guide tab 6d through the locking hole 6o and the Abwinkelantrieb 6j on whose connection element 6n couples.

In a further step, the Abwinkelantrieb 6j is now extended a little further, whereby the stop pin 6h relieved in the locking holes 6o and then pulled. Then the decoupled rods 6l of the Abwinkelantriebe 6j are fully retracted and the stop pin 6h through the stop opening 6g in the guide plate 6d in the stop opening 6c 'of the sliding plate 6b for the 20 ° position or in the stop opening 6c of the sliding plate 6b for the 40 ° Position inserted. In the present case, the stopper opening 6c of the sliding tab 6b is selected for the 40 ° position. By a luffing of the main boom 2 by the luffing angle a, the main boom extension 1 is now further angled and the tip 1f of the main boom extension 1 slides through the bottom 3 in the direction of the main boom 2. By Aufwippen the main boom extension 1 is further angled until the combi Abwinkelellaschen 6 limit the bending in the preselected position. At the time of limiting the Abwinkelbewegung in the 40 ° position by the combination Abwinkellaschen 6, the tip 1f just has contact with the ground 3. In a further Auflippen the main boom 2 then raises the main boom extension 1 from the bottom 3 in the 40 ° position. This position, in which the main boom extension 1 to the main boom 2 is in a 40 ° position, is in the FIG. 7 shown. For reasons of clarity, the tip 1b of the main boom extension 1 is not shown there.

In the FIG. 8a is a detail view of a combination Abwinkellasche 6 in the position according to FIG. 7 shown. The stopper bolt 6h abuts in the stopper opening 6g on the right stopper surface 6i 'facing the main boom head 2a. Also, the stopper pin 6h abuts the left stopper surface 6a 'of the slide plate 6b. As a result, the maximum displacement possibility of the guide tab 6d is limited to the sliding tab 6b. The corresponds to a Abwinkelwinkel of 40 °.

In the FIG. 8b is a view according to FIG. 8a shown, in which the sliding plate 6b and guide tab 6d are built apart and thus shown side by side. From this view it can be clearly seen that the Abwinkelantrieb 6j is still decoupled, since the connection element 6n is away from the stop pin 6h.

A backward or upright of the main boom extension 1 takes place in the reverse order.

Although in the context of the present embodiment, the main boom 2 is described as a telescopic boom and the skin extension boom 1 as a lattice boom lattice boom, the invention is also applicable to other embodiments of main boom 2 and skin extension boom 1. The main boom 2 may also be a lattice boom or a combination of telescopic boom, lattice boom and / or box boom. For the main boom extension 1 lattice boom or box boom or combinations thereof are conceivable.

Also, the use of a single and centrally relative to the width of the upper belt 1d of the main boom extension 1 arranged combination Abwinkellasche 6 is conceivable. Furthermore, the combination Abwinkellasche 6 has been described as a pull rod. A design as a push bar also works and an arrangement in the lower flange area. It is also conceivable that then the rocking w is arranged in the region of the upper flange 1d. The foot 1c of the main boom extension 1 is beveled accordingly, preferably in the form of an adapter to allow angling of the main boom extension 1 to the upper Wippachse w.

LIST OF REFERENCE NUMBERS

• 1 main boom extension
• 1a basic boom
• 1b tip
• 1c foot
• 1d upper strap
• 1e lower belt
• 1f head
• 2 main booms
• 2a main boom head
• 2b basic box
• 2c telescopic shots
• 3 floor
• 3a first floor level
• 3b second floor level
• 3c third floor level
• 4a fork strap
• 4b tab
• 4c bolt
• 6 combination angle bracket
• 6a, 6a 'stop surface
• 6b sliding latch
• 6b 'first sliding tab part
• 6b "second sliding lug part
• 6c, 6c 'stop opening
• 6d guide strap
• 6d 'first guide tab part
• 6d "second guide plate part
• 6f guide opening
• 6g stop opening
• 6h stop bolt
• 6i, 6i 'stop surface
• 6j Abwinkelantrieb
• 6k case
• 6l rod
• 6m locking hole
• 6n connection element
• 6o locking hole
• 6p, 6p 'stop surface
• 6r connection hole
• 6s connection hole
• 6t locking bolt
• 7 rocker cylinders
• 8 uppercarriage
• 9a lower roller head axle
• 9b upper roller head axle
• 10a fork strap
• 10b tab
• 10c bolt
• A bolting point
• B bolting point
• C bolting point
• D bolting point
• E bolting point
• F bolting point
• G Verbolzungsstelle
• a rocking angle
• b angle of attack
• c longitudinal direction of the Abwinkellasche
• h longitudinal direction of the main boom
• v Longitudinal direction of main boom extension
• w rocking axis

Claims (13)

1. Mobile crane with a main jib (2) luffably mounted thereon and able to be raised via a luffing cylinder (7), and with a main jib extension (1) releasably connected to a main jib head (2a) of the main jib (2) via upper and lower bolts (4c), the main jib extension (1), starting from a basic position, is able to be angled about a luffing axis (w) relative to the main jib (1) by means of an angling drive (6j), the angling drive (6j) is a component of a combi-angling plate (6) which delimits a maximum angling angle (b) in a mechanically adjustable manner, wherein the angling drive engages on a foot (1c) of the main jib extension (1) and the main jib head (2a) and the combi-angling plate (6) consists of a sliding plate (6b), a guiding plate (6d) and the angling drive (6j), characterised in that the combi-angling plate (6) can be modified in length via the angling drive (6j) and the angling drive (6j) drivingly engages on the one hand on the sliding plate (6b) and on the other hand on the guiding plate (6d) and the sliding plate (6b) can be displaced in a length-modifiable manner relative to the guiding plate (6d) via the angling drive (6j).
2. Mobile crane as claimed in claim 1, characterised in that the angling drive (6j) is releasably fastened to the sliding plate (6b).
3. Mobile crane as claimed in any one of claims 1 or 2, characterised in that the combi-angling plate (6) on the one hand engages on the main jib head (2a) and on the other hand on the main jib extension (1).
4. Mobile crane as claimed in any one of claims 1 to 3, characterised in that the sliding plate (6b) is displaceably guided in the guiding plate (6d) and the angling drive (6j) is disposed in the guiding plate (6d).
5. Mobile crane as claimed in any one of claims 1 to 4, characterised in that by means of a stop bolt (6h), a maximum displacement of the sliding plate (6b) relative to the guiding plate (6d) can be delimited.
6. Mobile crane as claimed in any one of claims 1 to 5, characterised in that the luffing axis (w) is formed in the region of the top chord (1d) of the main jib extension (1) or of the bottom chord (1e) of the main jib extension (1) and the combi-angling plate (6) is disposed in the region of the bottom chord (1e) of the main jib extension (1) or of the top chord (1d) of the main jib extension (1).
7. Mobile crane as claimed in any one of claims 1 to 6, characterised in that the angling drive (6j) is designed in such a way that the main jib extension (1) can be lifted and lowered in a pivoting manner about the luffing axis (w) against the effect of the gravitational force of the main jib extension (1).
8. Mobile crane as claimed in any one of claims 1 to 7, characterised in that the angling drive (6j) is designed as a hydraulic cylinder with a housing (6k) and rod (61).
9. Mobile crane as claimed in any one of claims 1 to 8, characterised in that two combi-angling plates (6) are disposed in parallel and spaced apart from one another and the two combi-angling plates (6) are preferably disposed in corner regions of the main jib extension (1).
10. Mobile crane as claimed in any one of claims 1 to 9, characterised in that the combi-angling plate (6) replaces a part of the top chord (1d) or of the bottom chord (1e) of the main jib extension (1) in the region of the foot (1c) of the main jib extension (1).
11. Mobile crane as claimed in any one of claims 3 to 10, characterised in that the sliding plate (6b) is pivotably mounted on the main jib head (2a), the guiding plate (6d) is pivotably mounted on the main jib extension (4) and by means of an insertable stop bolt (6h) a maximum displacement of the sliding plate (6d) in the guiding plate (6d) can be delimited.
12. Method for angling a main jib extension (1) relative to a main jib (2) of a mobile crane, in particular of a mobile crane as claimed in any one of claims 1 to 11, wherein the main jib (2) is luffably mounted on the mobile crane and can be raised via a luffing cylinder (7), the main jib extension (1) is releasably connected to a main jib head (2a) of the main jib (2), an angling drive (6j) engages on a foot (1c) of the main jib extension (1) and on a main jib head (2a),
    characterised in that by means of the angling drive (6j), which is a component of a combi-angling plate (6) which delimits a maximum angling angle (b) in a mechanically adjustable manner and can be modified in length via the angling drive (6j), the main jib extension (1), starting from a basic position, is lifted about a luffing axis (w) relative to the main jib (2) until a locking bolt (6t) for a 0° position within the combi-angling plate (6) is relieved, then the locking bolt (6t) is removed, then, unless it has happened already, the angling drive (6j) is drivingly coupled to the combi-angling plate (6), by means of the angling drive (6j) the main jib extension (4) is lowered until the maximum angling position is reached or a head (1f) of the main jib extension (1) comes into contact with a ground surface (3), the angling drive (6j) is drivingly separated from the combi-angling plate (6) and, when the maximum angling position has not yet been reached, by means of raising the main jib (2), the main jib extension (1) is angled until the desired angling angle (b) is reached.
13. Method as claimed in claim 12, characterised in that, after the separation of the angling drive (6j), a stop bolt (6h) is inserted into the combi-angling plate (6) and the maximum extension of the combi-angling plate (6) and therefore the maximum angling angle (b), preferably 20° or 40°, is delimited by the stop bolt (6h).

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