EP1982947A2 - Luffing crane with transport holder for roller blocks - Google Patents

Abstract

The crane has an extension arm (2) supported at an upper end of a tower (1), where the arm is moved against the tower by a pulling unit (3). The pulling unit has a pulling rope (4), which is clamped at a winch (5) and is passed into a roller block set (6). The set has a roller block (7) arranged at the arm and another roller block (8) arranged at a tip of the tower in an operational position of the set. The blocks are detachably fastened and stored in a transporting holder, which is arranged at a counter extension arm (10), in a transporting position with the pulling rope passed into the set.

Description

The invention relates to a luffing crane with a tower and a boom mounted at its upper end, wherein the boom is adjustable by means of a retraction in its inclination relative to the tower and the retraction has a Einziehseil, which is placed on a Einziehseilwind and reeved into a Rollenblocksatz wherein the roller block set in operative position comprises a first on the boom and a second roller block arranged on a spire.

In a luffing crane, the lateral change in position of the load-carrying means is brought about by an angular displacement of the jib, that is, raising or lowering of the jib relative to the tower.

Such a luffing crane is for example in the DE 87 09 267 U1 described. The known luffing crane has a counter-jib, on which both the counterweights and the hoist are arranged with a hoist winch. The retractor of the boom is located at the top of the tower. From the retraction the hoist rope is guided over the second second roller block fixedly attached at the end to the so-called spire and from there reeved several times into a first roller block. The first roller block is detachably connected to the spire by means of a bolt connection and is released from the spire during assembly of the crane and instead struck against the spout. This one has the Advantage that the Einziehseil need not be reevaluated on the construction site, since the cable guide remains unchanged by the role block set. The main disadvantage of the known luffing crane lies in the large mass of the spire, which must be further decomposed due to the attached retracting for transport purposes.

The same applies to the cranes, for example, from the EP 1 780 165 A1 or the DE 2 217 379 have become known.

For this reason, the invention has the object to develop a luffing crane, with the simplest possible assembly / disassembly and transport of the crane is possible.

The object is achieved in a generic luffing crane in that both roller blocks are releasably secured and can be stored in a transport position with retracted Einziehseil on a arranged on a counter-jib transport bracket. For disassembly therefore formed from two roller blocks pulley of Einziehseils is released from its original position and stored on the counter-jib. For re-assembly of the roller block set is lifted to its intended operating position with a mobile crane and fixed there. The Einscheren the Einziehseils in the two roller blocks eliminated completely. In addition, the roller block set is located on the counterjib in a protected area for transportation. The boom and the spire are thus not burdened with additional aggregates and can be particularly easy to dismantle and transport.

Another significant benefit is the maintenance of the pre-tension of the pull-in rope on the factory-supplied rope Retractable winch, as the pull-in rope does not have to be unwound for cutting in the roller blocks, which relaxes the pull-in rope. In operational use, the winding of the pull-in cable usually takes place under load, so that again a bias is introduced into the pull-in cable. In the transport bracket, the pull-in rope is therefore always stored with a bias, resulting in a significant increase in the lifetime.

Preferably, the Einziehseilwinde is disposed on the counter-jib, so that there is a compact, modular structure. In addition, all drives of the crane, the derailleur and the electrical system should be housed on the counterjib.

In a particularly favorable embodiment, the counter-jib has a box-shaped support frame. The support frame has no outwardly projecting components. In particular angle profiles made of steel are suitable as material for the support frame.

Also, it has been found to be advantageous if the box-shaped support frame has outer dimensions of a standard container. This embodiment particularly supports the modular structure of the counterjib and ensures easy and flexible transportation, regardless of the means of transport available. Due to the standardized dimensions, the support frame can be stacked for storage in a small space.

Conveniently, a hoist winch is arranged within the support frame. Thus, another unit is integrated into the support frame and consistently implemented the modular structure. Furthermore, the mass of the hoist winch is advantageously displaced into an area which is already loaded with counterweights.

Consequently, due to the favorable positioning of the hoist winch in the region of the supporting frame, a reduction of the counterweights takes place.

The support frame may also have a free space for receiving counterweights, the free space should be suitable in terms of its dimensions for receiving a driver's seat. In the disassembled state of the luffing crane, the counterweights are removed and transported separately. The space originally filled with the counterweights is then empty and serves for the specially protected accommodation of the driver's cockpit within the transport frame.

According to a further preferred embodiment, two mutually parallel trusses, each with a fastening means for one of the roller blocks are arranged on the upper side of the support frame as a transport bracket. In the fastening means, the roller blocks are used during transport and secured, for example by means of a fastening bolt. In order to prevent twisting of the Einziehseils, the two roller blocks should be stored axially parallel to each other. The trusses can then also be aligned axially parallel to the axes of rotation of the roller blocks.

For ease of assembly or disassembly of the support frame should be releasably attached to the tower. For this purpose, corresponding stop points can be formed on a front-head side of the support frame, the form-fitting components of the tower, in particular a grid frame, embrace and thereby hold the support frame in the intended position.

Conveniently, the first roller block is staked in operative position on a main bracing of the boom. The The main guy is composed of bar members and extends from the first roller block to the end of the boom.

Preferably, the second roller block is arranged in operative position at the end of the tower top.

In an advantageous embodiment, the second roller block comprises a plurality of pulleys, which are mounted on a common axis and fixed in the axial direction. The roller block is thus formed as a one-piece component and can be removed as a whole from the spire and re-attached there.

Fig. 1:

eine Seitenansicht auf einen Wippkran in betriebsbereitem Zustand;

Fig. 2:

eine Draufsicht auf einen Gegenausleger mit einem Tragrahmen;

Fig. 3:

eine vergrößerte Draufsicht auf den Tragrahmen mit daran befindlicher Transporthalterung;

Fig. 4:

einen Querschnitt längs der Schnittebene A-A in Fig. 3;

Fig. 5:

einen Querschnitt durch einen ersten Rollenblock und

Fig. 6:

einen Querschnitt durch einen zweiten Rollenblock.

For a better understanding, the invention will be explained in more detail with reference to a total of six figures. It show the

Fig. 1:

a side view of a luffing crane in working condition;

Fig. 2:

a plan view of a counter-jib with a support frame;

3:

an enlarged plan view of the support frame with it befindlichem transport bracket;

4:

a cross section along the sectional plane AA in Fig. 3 ;

Fig. 5:

a cross section through a first roller block and

Fig. 6:

a cross section through a second roller block.

The FIG. 1 shows a side view of a luffing crane with a tower 1, at the upper end of a boom 2 is attached. The tip of the boom 2 can be raised or lowered by pulling or lowering the pull-in cable 4 either in the pivoting direction A.

The tower 1 is usually set up in an operative position stationary. A lateral pivoting of the boom 2 is realized via a arranged in the upper portion of the tower 1 turntable 24. Immediately above the turntable 24, the driver's seat 16 can be seen. This is located below the boom 2 and pivots laterally with this.

On the driver's seat 16 opposite side attacks on the tower 1, a counter-jib 10, which is essentially formed of a box-like support frame 12. Within the support frame 12 are a plurality of stacked counterweights 15 and a retractor. 3

The pull-in unit 3 comprises the pull-in cable winch 5, on which the pull-in cable 4 is wound. In addition, a hoist winch 13 is housed within the support frame 12, which serves the drawing or discharging a hoisting rope, not shown. At the end of the hoisting rope is a load-receiving means, for example in the form of a crane hook.

For a favorable force application point, the pull-in cable 4 is guided by the counterjib 10 via a tower spike 9 engaging at the upper end of the tower 1 and extending upwards, where it engages to a main guy 20 of the boom 2 at. To reduce the traction requirement, the pull-in cable 4 is reeved in a pulley block, which is formed from a roller block set 6 with a first roller block 7 and a second roller block 8. Both roller blocks 7, 8 can be solved by their mounting position shown in a simple manner and accommodate the rope guide on the counter-jib 10 while maintaining.

The FIG. 2 FIG. 12 illustrates a plan view of the counter-jib 10 comprising the support frame 12 formed with a rectangular base. Corner fittings 22 are formed in the corners of the support frame 12 both on the top 17 visible from above and at the bottom in which the support frame is transported 12 not shown twist locks a container lock engage and thereby fix the support frame 12 to a vehicle. The support frame 12 should have the outer standardized dimensions of a 20, 30 or 40 foot container.

On one of the two front-head sides are two attachment points 23, with which the support frame 12 is fixed in the mounted position on the tower 1. On the opposite side of the attachment points 23, a free space 14 can be seen, which serves to receive counterweights 15 in the operational state of the tipping crane. During transport usually the segmented counterweights 15 are removed. Within the free space 14 then the driver's cock 16 can be used, so that it is protected from damage.

In a central region between two parallel longitudinal members of the support frame 12, two trusses 18a, 18b and form together with the fastening means 19 integrally formed thereon Transport bracket 11 for the roller blocks 7, 8. For reasons of clarity, the representation of the rope course was omitted. However, the pull-in cable 4 extends between the roller blocks 7, 8, wherein the inlet and outlet side is facing each other.

The FIG. 3 shows the in the FIG. 2 marked section x as enlarged detail view. On the traverse 18a, a fastening means 19 can be seen, in which the first roller block 7 is held. For this purpose, the fastening bolt can be used, which is used in the ready state for connection of the first roller block 7 with the main brace 20.

The second roller block 8 essentially comprises an axle 21b and pulleys S ₁ , S ₂ , S ₃ , S _4, which are held stationary in the axial direction (see FIG FIG. 6 ). The axis 21 b is inserted from above into two fastening means 19 of the traverse 18b.

Both roller blocks 7, 8 are connected to each other by means of two externally mounted connecting means 28 in the form of chains, so that the roller block set 6 can be raised and mounted as an assembly.

The FIG. 4 shows the trusses 18a, 18b with their attachment means 19 in a cross section. The fastening means 19 on the traverse 18 b is formed of two protruding brackets, each end an upwardly open recess for receiving the axis 21 b (see FIG. 6 ) exhibit. In the presentation of the FIG. 4 the rear attachment means 19 is hidden. Also in the FIG. 4 is the second roller block 8 associated stop point 25 of the pull-in 4 to recognize.

In the FIG. 5 is the first roller block 7 seen in a sectional view. The pulleys S ₁ , S ₂ , S ₃ , S ₄ are applied to an axis 21 a, which in turn is mounted in two mutually spaced walls of a link 26.

The in FIG. 6 shown second roller block 8, however, has an open design and includes only the axis 21 b with the applied thereon pulleys S ₁ , S ₂ , S ₃ , S _4th Each pulley S ₁ , S ₂ , S ₃ , S ₄ is fixed on both sides with a spacer bushing 27 on the axis 21 b. This is necessary because otherwise the pulleys S ₁ , S ₂ , S ₃ , S ₄ solve during assembly of the roller block set 6 and could slide off the axis 21 b. At the turret 9, a complementary bearing for receiving the second roller block 8 bearing is formed.

LIST OF REFERENCE NUMBERS

1

tower

2

boom

3

luffing

4

draw-

5

Einziehseilwinde

6

Role Justified

7

first roll block

8th

second roller block

9

spire

10

counter-jib

11

shipping bracket

12

supporting frame

13

rope winch

14

free space

15

counterweights

16

driver's cab

17

Top support frame

18a, b

traverse

19

Fastener roller blocks

20

Hauptabspannung

21 a

Axis first block of rollers

21 b

Axle second roller block

22

Corner fitting Container locking

23

Anchorage tower

24

slewing ring

25

Lifting point pulling rope

26

Scenery roll block

27

Distanzbuchse

28

connecting means

A

pan direction

S ₁ -S ₄

pulley

Claims (12)

Luffing crane with a tower (1) and a jib (2) mounted at its upper end, wherein the boom (2) by means of a retraction (3) in its inclination relative to the tower (1) is adjustable and the retraction (3) Pulling cable (4) which is placed on a pulling cable winch (5) and reeved in a roller block set (6), wherein the roller block set (6) in operative position a first on the boom (2) and a second on a spire (9) comprises arranged roller block (7, 8),
characterized,
that both roller blocks (7, 8) releasably secured and arranged in a transport position with retracted Einziehseil (4) on a on a counter-jib (10)
Transport bracket (11) can be stored. Rocker crane according to claim 1, characterized in that the Einziehseilwinde (5) on the counter-arm (10) is arranged. Rocker crane according to claim 1 or 2, characterized in that the counter-jib (10) has a box-shaped
Has support frame (12). Rocker crane according to claim 3, characterized in that the box-shaped support frame (12) has outer dimensions of a standard container. Rocker crane according to claim 3 or 4, characterized in that within the support frame (12) a hoist winch (13) is arranged. Rocker crane according to one of claims 3 to 5, characterized in that the support frame (12) has a free space (14) for receiving counterweights (15). Rocker crane according to claim 6, characterized in that the free space (14) in terms of its dimensions for receiving a driver's pulpit (16) is suitable. Leaping crane according to one of claims 3 to 7, characterized in that on the upper side (17) of the support frame (12) as a transport bracket (11) has two mutually parallel trusses (18a, 18b) with fastening means (19) for the roller blocks (7, 8) are arranged. Rocker crane according to one of claims 3 to 8, characterized in that the support frame (12) is releasably attached to the tower (1). Rocker crane according to one of claims 1 to 9, characterized in that the first roller block (7) is struck in operative position on a Hauptabspannung (20) of the boom (2). Rocker crane according to one of claims 1 to 10, characterized in that the second roller block (8) is arranged in the ready position at the end end on the spire (9). Rocker crane according to one of claims 1 to 11, characterized in that the second roller block (8) has a plurality Pulleys (S ₁ , S ₂ , S ₃ , S ₄ ), which are mounted on a common axis (21 b) and fixed in the axial direction stationary.

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