DE3838975C2

DE3838975C2 -

Info

Publication number: DE3838975C2
Application number: DE19883838975
Authority: DE
Inventors: Joachim Dipl.-Ing. 4000 Duesseldorf De Lietzau
Original assignee: Mannesmann AG
Current assignee: Terex Demag GmbH and Co KG
Priority date: 1988-11-14
Filing date: 1988-11-14
Publication date: 1991-02-28
Anticipated expiration: 2008-11-15
Also published as: DE3838975A1

Description

The invention relates to a mobile crane with the features of Preamble of the main claim.

From DE-OS 23 12 191 is a two-axle mobile crane known who quickly from the driving arrangement in the Working position is convertible. He has a little one Counterweight by a 180 degree swivel of the uppercarriage lifted from the shelf and in the rear Bracket is put down. An adjustable strut it is not intended to increase the counter torque and not necessary with such a small vehicle.

The heavy duty crane according to DE-OS 28 39 665 has none length-adjustable strut for moving the counterweight, but just an articulated arm, the one Can prevent the counterweight from swinging sideways.

Furthermore, DE-OS 30 19 220 is known, the one spread arrangement of the counterweight carrier to Increase the stability, the Counterweight carrier is always supported on the floor.

The mobile hoist according to DE-OS 34 27 689 has one Support column that is at the top with the top of the Counterjib is connected. This support is not Hydraulic cylinder and is not used for fast Raising the mast. This is not the purpose of the articulated drawbar connected to the boom, consequently independent, additional devices are used.

The mobile crane according to DD-PS 73 132 has as an aid to raise the mast and the boom one up directional support that is itself unstable and meets the requirements especially not with larger mobile cranes justice. The counterweight hangs at approximately vertical mast freely down and is strong The mast inclination is fixed to the superstructure by means of a strut and can only take part in one of the many desired Positions.

Based on the latter prior art, it is hence the object of the invention, a mobile crane like this to design that he takes little time from the Driving arrangement in the working position and during the Working position on different sizes and Loads can be converted.

The first part of the task is solved in that the mast of one resting on the superstructure Hydraulic cylinder is erectable and that the strut is variable in length. The mast can be erected then easily done and can be changed due to the length Strut towards the counterweight so inclined be that he the to cancel or adjust the Take the required position easily can.

The second part of the task, namely upgrading different sizes (versatility of the vehicle) and loads (increase in load torque) solved by the length-adjustable strut that Telescopic extension of the mast and the other at the The articulation point located at the tip is adjustable in length Hanging bar the counterweight for application of the required counter torque in the respectively required Distance to the superstructure is brought and on the other hand, the length-adjustable guy device the direct connection of variable length Produces booms and telescopic masts and thus enables raise the boom more or less at full load or to change the radius. The hanging device can by a rope or chain drive or a hydraulic cylinder extendable and the strut through a pressure medium cylinder with piston be extendable, which can be fixed in both directions. At especially large distances between the uppercarriage and the counterweight can hangers and struts extension rods or ropes to have.

There is a fold-down support on the chassis for road travel the mast and a counterweight carrier available. So that the role set of Bracing to reduce the height when driving between the mast spars can be arranged, the hanging device must have a bendable Be attached to the mast. The other end of the hanger is on the counterweight carrier. The superstructure also has one Articulation piece for the boom, a telescopic boom or Lattice boom can be and with large dimensions on one special vehicle is transported to the place of use. To initiate the A hoist is used to raise the jib. A Hydraulic cylinder prevents the boom from kicking back strong wind or when the load suddenly breaks off when the boom is very steep. The cabin for controlling the crane operation is for Swiveling side attached to the superstructure and thus allows a good Accessibility to the articulation piece when the boom is attached.

Several embodiments of the invention are in the drawings shown and explained below. Show it:

1 shows a mobile crane in the driving position,

Fig. 2 shows a mobile crane with a telescopic boom in a shortened working position,

Fig. 3 shows a mobile crane with a lattice boom and slightly pivoted counterweight,

Fig. 4 shows a mobile crane with an extended telescopic mast as well as a telescopic boom and a far-reaching counterweight.

The chassis 1 of the mobile crane has a fold-down support 2 behind the driver's cab for supporting the mast 4 during travel and a rotary connection 1.1 for an uppercarriage 3 over the rear axles, to which a crane operating house 3.1 is fastened to the side by means of a pivot axis 3.2 . On the chassis 1 , a counterweight support 8 is also arranged in the front area with an upper attachment point 8.1 for a hanging device 6 , which is articulated on the mast 4 via a bendable end piece 6.1 . Between the spars of the mast 4 is a roller set of a pulley 11 for guying the boom, which is transported while traveling in a special vehicle and can be fastened to a link 19 of the superstructure 3 at the place of use. A strut 7 leading to the counterweight carrier 8 and a hoist cable winch 16 are also arranged on this.

FIG. 2 shows the mobile crane with the telescopic boom 14 retracted, which is connected to the superstructure 3 via the link 19 . The mast 4 was erected with the help of the mast cylinder S and carries the counterweight 9 arranged on the counterweight carrier 8 , which is guided over the strut 7 on the superstructure 3 , via the hanging device 6 with an extendable extension 6.2 . The mast 4 has in the lower area a winch 12 for a rope 10 , which is connected via the pulleys 11 of a block and tackle with a guy 13 for the boom 14 . Its end carries rollers 18 for a hoisting rope 17 of a hoisting winch 16 fastened to the superstructure 3 . Erecting or Nachverstellung the boom 14 is achieved by the pulley. 11 The lifting cylinder 15 supports it.

In the embodiment according Fig. 3 of the vehicle crane has a lattice boom 14.1 and the counterweight 9 is moved to apply a larger load torque over a Ausschiebeverlängerung 7.1 of the strut 7 in the opposite direction of the extension arm 14.1. The support 2 shown in FIG. 1 is folded down.

The use case of Fig. 4, the shortened drawn telescopic boom 14 is fully extended and the bracing 13 was extended to the point of attack on the boom tip by further bracing pieces 13.1. The counterweight 9 is located in front of the cab of the chassis 1 and the strut 7 is connected via an extension rod 7.2 to an extension 6.3 of the suspension device 6 , so that even greater load moments can be realized. The telescopic extension 4.1 of the mast 4 was extended. Instead of the telescopic boom, a lattice boom with several shots according to FIG. 3 can also be used with such a large boom length.

Claims

1. mobile crane with an uppercarriage for a telescopic boom for lifting the load and with a swiveling mast opposite the boom for a counterweight attached to a hanging device, which is connected to the uppercarriage via a strut and with a direct connection between the mast and the boom, characterized in that the mast ( 4 ) can be erected by a mast cylinder ( 5 ) supported on the superstructure ( 3 ) and the strut ( 7 ) can be changed in length and the mast ( 4 ) has a telescopic extension ( 4, 1 ) the tip of which has a pivot point ( 4, 2 ) for the length-adjustable suspension device ( 6 ) and a length-adjustable guy device ( 10, 11, 13 ) for the length-adjustable boom ( 14 ).

2. Mobile crane according to claim 1, characterized in that the variable-length suspension device ( 6 ) has a cable or chain drive.

3. Mobile crane according to claim 1 ,, characterized in that the variable-length suspension device ( 6 ) is a hydraulic cylinder.

4. Mobile crane according to claim 1, characterized in that the length-adjustable strut ( 7 ) is a pressure medium cylinder with a piston.

5. Mobile crane according to claim 2 to 4, characterized in that the hanging device ( 6 ) and strut ( 7 ) have extension rods ( 6.1, 7.1 ).

6. Mobile crane according to claim 1, characterized in that a counterweight carrier ( 8 ) for the counterweight ( 9 ) on the chassis ( 1 ) can be parked, and that the hanging device ( 8 ) attached to an attachment point ( 8,1 ) of the counterweight carrier ( 8 ) 6 ) is articulated to the upper end of the mast ( 4 ) via a bendable end piece ( 6,1 ).

7. Mobile crane according to claim 1, characterized in that a winch ( 12 ) for a rope ( 10 ) a pulley block ( 11 ) for the guying ( 13 ) of the boom ( 14 ) is arranged on the mast ( 4 ) in the vicinity of its articulation point .

8. Mobile crane according to claim 1, characterized in that on the superstructure ( 3 ) on the boom ( 14 ) engaging hydraulic cylinder ( 15 ) is arranged.