MOBILE CRANE HAVING A COUNTERWEIGHT DEVICE

Abstract

The disclosure relates to a mobile crane that comprises a travelable undercarriage, a superstructure rotatably supported on the undercarriage, and a counterweight device couplable to the superstructure. The counterweight device comprises a counterweight base plate and at least one connection means for raising the counterweight device and for coupling it to the superstructure. The disclosure furthermore relates to a counterweight device for a mobile crane in accordance with the disclosure.

Claims

1. A mobile crane comprising a travelable undercarriage, a superstructure rotatably supported on the undercarriage, and a counterweight device that is couplable with the superstructure and that comprises a counterweight base plate and at least one connection means extending substantially perpendicular to the counterweight base plate and connected thereto for raising the counterweight device and coupling the counterweight device to the superstructure, wherein the at least one connection means comprises the following: a) a placement area via which the counterweight base plate lies on the connection means and introduces its weight force at least in the absence of an inclination of the mobile crane; b) a centering means by means of which the counterweight device can be positioned in an installation position on the superstructure; and c) a fastening means via which the counterweight device is releasably connectable to the superstructure in the installation position.

2. A mobile crane in accordance with claim 1, wherein the connection means is configured in one piece.

3. A mobile crane in accordance with claim 1, wherein the connection means is fixedly connected to the counterweight base plate.

4. A mobile crane in accordance with claim 1, wherein the connection means comprises a base section that is received in a recess of the counterweight base plate; a middle section that projects through an opening of the recess; and a coupling section for coupling with the superstructure, wherein the base section comprises the placement area and has a larger width than the middle section and the opening of the recess.

5. A mobile crane in accordance with claim 4, wherein the recess is open toward a lower side of the counterweight base plate and is closed by a cover connectable to the counterweight base plate, with the recess allowing a movement of the base section in the longitudinal direction of the connection means within the recess that is bounded on one side by an attachment of the placement area to a wall of the recess and on the other side by an attachment of the base section at the cover.

6. A mobile crane in accordance with claim 1, wherein a ballasting device is provided at the superstructure and is configured to raise and place down the counterweight device.

7. A mobile crane in accordance with claim 6, wherein the ballasting device comprises at least one hydraulic ballasting cylinder that can be releasably brought into engagement with the coupling region of the at least one connection means, with the ballasting device furthermore comprising a ballast frame connectable to the superstructure via fastening means.

8. A mobile crane in accordance with claim 7, wherein the coupling region comprises a recess into which a coupling piece of the ballasting cylinder can in particular be traveled by rotating the superstructure about its axis of rotation, with the coupling piece being lockable in the recess.

9. A mobile crane in accordance with claim 1, further comprising at least one counterweight element stackable on the counterweight base plate, said counterweight element having at least one recess through which the at least one connection means projects in the placed down state.

10. A mobile crane in accordance with claim 8, wherein the recess of at least one counterweight element is configured such that the coupling piece of the ballasting cylinder can be positioned within the recess beside the coupling region of the connection means and can be traveled into the coupling region by rotating the superstructure, with the recess having an abutment which the coupling piece abuts in a locking position in which the counterweight device can be lifted by the at least one ballasting cylinder.

11. A mobile crane in accordance with claim 1, wherein the counterweight device comprises at least two mutually spaced apart connection means that are connected to the counterweight base plate and that are arranged at the same distance from the center of gravity of the counterweight base plate and/or are rotated in parallel with one another or against one another.

12. A mobile crane in accordance with claim 1, wherein the counterweight device comprises at least one placement centering means for positioning the counterweight device on a placement region of the undercarriage, with the placement region having at least one corresponding counter-placement centering means that can be brought into engagement with the placement centering means for a correct positioning of the counterweight device on the undercarriage, with the placement centering means being arranged at a lower side of the counterweight base plate and/or of the at least one connection means.

13. A mobile crane in accordance with claim 1, wherein the fastening means comprises a fastening section having a bolt mount to establish a bolt connection with the superstructure, with the superstructure comprising a stabilization metal sheet that is located below the bolt connection in the bolted state and has an opening through which the fastening section of the connection means can be pushed to establish the bolt connection, with the stabilization metal sheet being configured such that it takes up shear forces in the bolted state on an inclination of the mobile crane.

14. A mobile crane in accordance with claim 6, wherein the superstructure comprises a counter-centering means that is configured to automatically position the counterweight device in an installation position on a raising of the counterweight device by cooperating with the centering means of the connection means, in which installation position it is connected to the superstructure, with the centering means comprising a chamfered surface, and/or with the centering means being arranged in the region of the fastening means an end of the connection means disposed opposite the counterweight base plate.

15. A counterweight device for a mobile crane in accordance with claim 1, further comprising at least one counterweight element that is stackable on the counterweight base plate.

16. A mobile crane in accordance with claim 2, wherein the connection means is configured as a one-piece sheet metal construction having a substantially flat shape.

17. A mobile crane in accordance with claim 6, wherein the ballasting device is configured to raise and place down the counterweight device from and onto a placement region of the undercarriage, wherein the connection means has a coupling region via which a coupling with the ballasting device can be established at an end disposed opposite the counterweight base plate.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0064] Further features, details, and advantages of the disclosure result from the embodiments explained in the following with reference to the Figures. There are shown:

[0065] FIG. 1: the mobile crane in accordance with the disclosure in accordance with an embodiment in a side view;

[0066] FIG. 2: a first embodiment of the counterweight device in accordance with the disclosure without counterweight elements in a perspective view;

[0067] FIG. 3: a section through one of the connection means along its short side in the region of the counterweight base plate;

[0068] FIG. 4: a section through one of the connection means along its long side in the region of the counterweight base plate;

[0069] FIG. 5: a perspective view of the counterweight base plate with a view of its lower side without connection means and covers:

[0070] FIG. 6: the counterweight base plate in accordance with FIG. 5 with connection means and installed covers;

[0071] FIG. 7: a perspective view of the counterweight device in accordance with FIG. 2 placed on a placement device of the undercarriage;

[0072] FIG. 8: a section through the counterweight device fastened to the superstructure in the region of the connection means and its bolting to the superstructure;

[0073] FIG. 9: an enlarged view of the fastening section of one of the connection means of the counterweight device in accordance with FIG. 8 bolted to the superstructure;

[0074] FIG. 10: a second embodiment of the counterweight device in accordance with the disclosure without counterweight elements in a perspective view; and

[0075] FIG. 11: a section through one of the connection means of the counterweight device in accordance with FIG. 10 along the long side of the connection means in the region of the counterweight base plate.

DETAILED DESCRIPTION

[0076] An embodiment of the mobile crane 10 in accordance with the disclosure in the form of a crawler crane is shown in a side view in FIG. 1. The mobile crane 1 has an undercarriage 12 having a crawler chassis and a superstructure 14 supported on the undercarriage 12 rotatable via a slewing gear about a vertical axis of rotation 13. The superstructure 14 comprises a telescopic boom 16 supported luffably about a horizontal axis and a counterweight arrangement also called superstructure ballast.

[0077] The superstructure ballast in this embodiment comprises a ballast frame 21 that is connected to the steel structure of the superstructure 14 via bolt connections and that can be removed from the superstructure 14 for transport. Two hydraulic ballasting cylinders 23 whose piston rods can be downwardly extended and have a coupling piece are received at the ballast frame 21. A counterweight device 20 can be lifted from a placement region to the superstructure 14 and can be connected thereto via the ballasting cylinders 23. In this embodiment, the placement region is formed by a foldable placement device 18 that is shown in more detail in FIG. 7 at the rear of the undercarriage 12. The placement region could, however, also be located at an upper side of the undercarriage 12 or on the floor. Conversely, the counterweight device 20 can be placed down on the placement device 18 again via an extension of the ballasting cylinders 23 and can be loaded onto a transport vehicle from there, optionally by means of an auxiliary crane or the boom 16 of the mobile crane 10.

[0078] The counterweight device 20 comprises a counterweight base plate 22 on which a plurality of counterweight elements 24 can be stacked. The superstructure ballast can thereby be variably configured and can be adapted to the desired deployment. The coupling of the counterweight device 20 to the ballasting cylinders 23 takes place via connection means 30 that project perpendicularly upwardly from the counterweight base plate 22 and that have coupling regions 38 at their upper ends for the reversible coupling with the coupling pieces of the ballasting cylinders 23 and fastening means 36 for fastening the counterweight device 20 to the ballast frame 21. The alignment or positioning of the counterweight device 20 in an installation position at the ballast frame 21 for the establishing of the connection via the fastening means 36 takes place via centering means 34 of the connection means 30.

[0079] The counterweight base plate 22 together with connection means 30 of the counterweight device 20 in accordance with the disclosure in accordance with a first embodiment is shown in a perspective view in FIG. 2. The counterweight base plate 22 has a swept shape and is connected to two connection means 30 that project perpendicularly upwardly from the counterweight base plate 22. The counterweight elements 24 not shown here are formed in plate shape and have corresponding recesses through which the connection means 30 project. The counterweight elements 24 are therefore stacked on the counterweight base plate 22 and are “threaded” on the connection means 30 in so doing until only the end regions of the connection means 30 project over the topmost counterweight element 24 (cf. FIG. 1).

[0080] The indications of direction “upward” and “downward” used herein relate to the case that the counterweight base plate 22 (and the mobile crane 10) stand on a level base and the connection means 30 are vertically aligned.

[0081] The connection means 30 that can also be called connection blades or simply blades are sheet metal constructions that are produced in one piece, that have a flat base shape, and that are connected to the counterweight base plate 22. Since the connection means 30 do not consist of a plurality of mutually connected parts, but are rather formed in one piece, weld connections that are complicated to manufacture and that have correspondingly high demands do not have to be provided.

[0082] In the first embodiment shown here, the connection means 30 are not fixedly connected to the counterweight base plate 22, but are rather displaceably supported in recesses 40 of the counterweight base plate 22 along the longitudinal axes of the connection means 30 (i.e. in the vertical direction with a planar base).

[0083] A section through one of the connection means 30 and the counterweight base plate 22 without counterweight elements 24 is shown along the short side of the connection means 30 in FIG. 3 and along the long side of the connection means 30 in FIG. 4.

[0084] The connection means 30 each have a lower base section 50 that merges into a middle section 52 having a substantially constant width (defined here as the extent along the long side of the connection means 30). A coupling section 54 for coupling the connection means 30 and thus the counterweight device 20 with the ballasting cylinders 23 of the ballasting device of the mobile crane 10 is located above the middle section 52. The connection means 30 has its maximum width in the base section 50. When only one connection means 30 is spoken of for reasons of simplicity in the following, both connection means 30 are naturally meant.

[0085] The connection means 30 is supported via its base section 50 in a recess 40 in the counterweight base plate 22. The recess 40 is open toward the lower side of the counterweight base plate 22 so that the connection means 30 can be pushed into the recess 40 from below to produce the counterweight device 20. The recess 40 merges, viewed from the lower side, into a section having a smaller width that is open toward the upper side of the counterweight base plate 22 and forms an opening 41.

[0086] As can be recognized in FIG. 4, the base section 50 of the connection means 30 merges within the recess 40 into the middle section 52 having a reduced width so that the center axis 52 extends through the region of the recess 40 having a reduced width and finally projects out of the counterweight base plate 22 through the opening 41 at the upper side. At the transition between the base section 50 and the middle section 52, the connection means 30 has two placement areas 32 that form the surface of the base section 50 adjacent to the middle section 52. The (partial) placement areas 32 in this embodiment form a flat, horizontal surface and can together be called a “placement area 32” of the connection means 30.

[0087] The counterweight base plate 22 lies via a wall 46 of the recess 40 that forms the transition between the regions of larger and smaller widths of the recess 40 on the placement areas 32 of the connection means 30. This wall 46 thus simultaneously forms an abutment for the base section 50 so that the connection means 30 cannot slip upwardly out of the counterweight base plate 22. In the raised state of the counterweight device 20 or in the state thereof fastened to the superstructure 14 the counterweight base plate 22 and thus all the counterweight elements 24 stacked thereon introduce their weight force via the contact on the placement areas 32 directly into the connection means 30.

[0088] The recess 40 is covered at the lower side of the counterweight base plate 22 by means of a metal cover plate 42 so that the connection means 30 cannot slip downwardly out of the recess 40. The metal cover plate 42 is fastened directly to the counterweight base plate 22 via a plurality of screws 44 (four here) and forms a removable cover for the recess 40.

[0089] In FIG. 5, the counterweight base plate 22 is shown with a view of its lower side and without metal cover plates 42. FIG. 6 shows the counterweight base plate 22 with connection means 30 inserted into the recesses 40 and with installed metal cover plates 42. The latter are let into or lowered into cutouts 48 at the lower side of the counterweight base plate 22 so that they do not project.

[0090] The metal cover plate 42 does not have any connection to the connection means 30, but is rather only installed at the counterweight base plate 22. As can be recognized in FIG. 6, the rectangular metal cover plate 42 does not completely cover the recess 40 so that the marginal regions of the connection means 30 are visible. The metal cover plate 42 could naturally also completely cover the recess 40, however.

[0091] The base section 50 of the connection means 30 can move slightly within the recess 40 along the longitudinal direction of the connection means 30, i.e. the connection of the connection means 30 with the counterweight base plate 22 has a certain movement play or degree of freedom. Since the metal cover plate 42 is not connected to the connection means 30, the counterweight base plate 22 lies on the placement areas 32 of the connection means 30 in the raised state or in the state installed on the superstructure 14 and the connection means 30 does not press onto the metal cover plate 42. The latter is thus relieved in this state. The connection means 30 is only seated on the metal cover plate 42 with a force on the counterweight base plate 22 directed upwardly with respect to the connection means 30 or in the placed down state and thus exerts a downwardly directed force on the metal cover plate 42. This corresponds to a tensile load of the screws 44.

[0092] The recess 40 is shaped such that it can take up the shear forces that act on the connection means 30 and that can occur, for example, on an inclination of the mobile crane 10 (slanting base) or on a cornering of the mobile crane 10. The recess 40 has correspondingly machined side surfaces for this purpose in the region of reduced width that are contacted by the side surfaces of the middle section 52 of the connection means 30 in the case of shear forces occurring. As can be recognized in FIGS. 3 and 5, the recess 40 has projections 45 that form the lateral contact surfaces for the connection means 30 in the region of smaller width. The shear forces (perpendicular to the longitudinal axis of the connection means 30) are thus fully introduced via the machined side surfaces of the recess 40 and the forces acting via the placement areas 32 along the longitudinal axis of the connection means 30.

[0093] The connection between the metal cover sheet 42 and the connection means 30 is therefore at maximum a compression connection and, where applicable, a slight friction connection that result with shear forces that occur. The screws 44 can conduct the compression forces onward in accordance with their purpose (tensile load). Shear forces are minimal and thus always in the permitted range. The screws 44 are always free of bending strains due to the degree of freedom of the base section 50 within the recess 40.

[0094] The metal cover plates 42 also form defined support points of the counterweight device 20. The counterweight base plate 22 can be placed thereon for installation on the undercarriage 12 and the counterweight elements 24 can be introduced via their recesses around the connection means 30 and can be placed on the counterweight base plate 22.

[0095] A possible embodiment for a placement device 18 of the undercarriage 12 is shown in FIG. 7. In this respect, the central ballast 82, that is directly installable at the undercarriage 12 via fastening elements, is expanded by a foldable mount for the counterweight device 20. In this respect, two pivot parts 80 are foldably fastened to side walls of the central ballast 82 and have support surfaces on which the counterweight device 20 can be placed at their upper sides. These support surfaces of the pivot parts 80 correspond to the metal cover plates 42 of the counterweight base plate 22.

[0096] Alternatively, the counterweight device 20 can be placed directly on a placement area of the undercarriage 12 or on the ground.

[0097] As initially explained, the connection means 30 simultaneously serve both the taking up and raising of the counterweight device 20 and its centration at and fastening to the ballasting device (or to the ballast frame 21). For this purpose, the connection means 30 have a coupling section 54 at their end disposed opposite the base section 50 (see FIG. 4).

[0098] The coupling section 54, on the one hand, comprises a coupling region 38 having an upwardly open, bracket-shaped recess 39 into which an especially shaped (in particular mushroom shaped) end or coupling piece of the corresponding ballasting cylinder 23 can move laterally. In the final position in which the counterweight device 20 can be securely raised (=locking position), the coupling piece of the ballasting cylinder 23 is located completely within the recess 39 (as the second ballasting cylinder 23 associated with the second connection means 30) whose shape makes a shape matched raising of the counterweight device 20 possible by retracting the ballasting cylinder 23 since its coupling piece cannot slip upwardly out of the recess 39.

[0099] The coupling of the ballasting cylinders 23 with the connection means 30 in particular takes place by a rotation of the superstructure 14 about its axis of rotation 13. The recesses of the counterweight elements 24 that are stacked on the counterweight base plate 22 and through which the connection means 30 project are therefore formed accordingly at least at the level of the coupling regions 38. At least the counterweight elements 24 disposed at the level of the coupling regions 38 in the stacked state are therefore in particular widened in the direction of rotation of the superstructure 14 so that the ballasting cylinders 23 can be retracted downwardly beside the connection means 30 into the recesses until the coupling pieces are at the level of the recesses 39 of the coupling regions 38. A coupling can then be established by rotating the superstructure 14.

[0100] So that the coupling pieces of the ballasting cylinders 23 are not moved through the recesses 39, but rather reach their correct locking position, the recesses of the corresponding counterweight elements 24 are optionally configured such that their side walls form corresponding mechanical abutments for the coupling pieces of the ballasting cylinders 23. An overrun of the ballasting cylinders 23 is thereby simply and effectively prevented.

[0101] After the raising of the counterweight device 20 to the superstructure 14 or to the ballast frame 21, the connection means 30 are bolted to the ballast frame 21. The ballasting cylinders 23 are thereby relieved during crane operation. A sectional view through the counterweight base plate 22 and the connection means 30 in a state in which the counterweight device 20 is installed on the ballast frame 21 without additional counterweight elements 24 is shown in FIG. 8. FIG. 9 shows an enlarged view of a single (bolt) connection of a connection means 30 with a ballast frame 21.

[0102] The coupling section 54 of the connection means 30 comprises an upwardly projecting fastening section 35 that is arranged above the coupling region 38 and that comprises both the centering means 34 and the fastening means 36 in the form of a bolt mount 37 (see FIG. 4). More precisely, the recess 39 of the coupling region 38 is located centrally at the connection means 30 (with a view of the long side), while two fastening sections 35 each having a centering means 34 and a bolt mount 37 are arranged above the recess 39 and at both sides thereof. Two bolt connections are therefore provided per connection means 30 for fastening the counterweight device 20 to the ballast frame 21.

[0103] In the present embodiment, the fastening sections 35 have a smaller thickness (defined here as the extent along the shorter side of the connection means 30) than the middle section 52 of the connection means 30, with this not necessarily having to be the case.

[0104] As can be recognized in FIGS. 8 and 9, the ballast frame 21 has an at least sectionally horizontally extending stabilization metal plate 70 having corresponding (and in particular slit-like) openings 71 into which the fastening sections 35 of the connection means 30 travel. Corresponding counter-fastening means in the form of further bolt mounts are located above the stabilization metal sheet 70. If the counterweight device 20 has been completely lifted onto the ballast frame 21 via the ballasting cylinders 23, i.e. if the counterweight device 20 is therefore located in its installation position, the bolt mounts 37 of the connection means 30 overlap the bolt mounts of the ballast frame 21 so that the corresponding bolts 72 can be placed (and in particular subsequently secured) to establish the bolt connections.

[0105] In the case of a dynamically loaded slanted travel or an inclination of the mobile crane 10, forces occur in the vertical and horizontal directions. These forces would be unfavorable for a single bolt connection. The connection means 30 are for this reason led through the stabilization metal sheet in their fastening sections 35. The bolt mount 37 can thus migrate on an inclination of the bolt mount 37 due to the dynamic load on the bolt 72 until the fastening section 35 contacts the corresponding side of the opening 71 of the stabilization metal sheet 70. After this contact, horizontal forces are directly introduced into the stabilization metal sheet 70 of the superstructure 14 by the connection means 30. The connection via the bolts 72 substantially remains a load in a vertical direction (i.e. perpendicular to the longitudinal bolt axis.

[0106] The installation position can be defined in the longitudinal direction of the connection means 30 via corresponding mechanical abutments at the connection means 30 and at the ballast frame 21.

[0107] A centering means 34 in the form of a projection or mandrel that projects upwardly and tapers in the longitudinal direction of the connection means 30 and via which the counterweight device 20 is brought into the desired installation position on the retraction of the ballasting cylinders 23 into the desired installation position is additionally provided at each of the fastening sections 35. The centering means 34 here cooperate with counter-centering means, not shown in more detail, at the ballast frame 21 and provide an automatic alignment of the counterweight device 20 on the raising at the ballast frame 21 due to their chamfered contours or insertion chamfers.

[0108] The centering means 34 here taper both along the long side and along the short side of the connection means 30, that is in two directions The centering means 34 can naturally have any other desired shape that effects a fine positioning or alignment of the counterweight device 20 on the raising to the ballast frame 21 into the installation position, for example a conical shape.

[0109] The counterweight base plate 22 in particular has the following objectives:

[0110] positioning the connection means 30 for the equipping of the counterweight device 20 by the ballasting cylinders 23 on the superstructure 14;

[0111] positioning the counterweight device 20 on the undercarriage 12, for example on a placement device 18 such as shown in FIG. 7. The coupling pieces of the ballasting cylinders 23 can thus engage into the coupling regions 38 of the connection means 30. This positioning has to take place very precisely since it in particular takes place by means of a rotational movement of the superstructure 14 about the axis of rotation 13 on the undercarriage 12;

[0112] the counterweight base plate 22 furthermore has to hold the connection means 30 securely in position, even when shear forces occur. Such shear forces can occur, for example, when the ballasting cylinders 23 rotate into the connection regions 34 and abut at or rub in them. The shear forces can also occur with inclinations or on cornering.

[0113] The connection means 30 have recesses 31 laterally at the middle section 52 that serve as attachment elements for fastening attaching means (e.g. a chain or a rope) of a crane for handling the carrier plate 22.

[0114] In the embodiment shown here, the connection means 30 are aligned in parallel with one another and with the side edges of the counterweight base plate 22. A particularly favorable arrangement thereby results that facilitates the manufacture of the counterweight base plate 22. This in particular takes place by filling a steel box with solid metal blocks and a subsequent filling up with a binding agent. The parallel arrangement generates geometrically ideal regions for filling the steel box with metal blocks. The manufacture is thereby possible in a simple and inexpensive manner. The same applies to the counterweight elements 24 and to their recesses for leading through the connection means 30.

[0115] The circular cutouts 60 in the lower side of the counterweight base plate 22 to be recognized in FIGS. 5 and 6 in the regions of the cutout 48 and adjacent to the recesses 40 serve as a placement centering means for the correct positioning of the counterweight base plate 22 on the placement region of the undercarriage 12. The latter optionally has corresponding projections as counter-placement centering means 62 that travel into the cutouts 60. The connection means 30 are thereby always in their correct position for equipping the counterweight device 20 that is in particular known to the crane control.

[0116] A specific example is shown in FIG. 7 in which the counter-placement centering means 62 are arranged on platforms that are installed laterally at the side walls of the central ballast 82.

[0117] To enable a positioning of the counterweight base plate 22 at different distances from the axis of rotation 13 (e.g. in combination with ballasting cylinders 23 adjustable in their relative position to the axis of rotation 13 of the superstructure), more than two placement centering means 60 can be provided, such as described, for example, in DE 10 2015 013 488 A1.

[0118] In FIGS. 10 and 11, a second embodiment of the counterweight device 20 in accordance with the disclosure is shown in a perspective view (FIG. 10) and in a sectional view through one of the connection means 30 along its long side (FIG. 11). Unlike the first embodiment, the connection means 30 are here not displaceably supported in the recess 40 of the counterweight base plate 22 and covered via metal cover plates 42, but are rather fixedly welded to the counterweight base plate 22. The connection here via the above-described solution with the degree of freedom of the base section 50 within the recess 40 is thus not necessary. The weld connection is sufficiently loadable.

[0119] As can be recognized in FIG. 11, the cutout 60 acting as a placement centering means is not in the counterweight base plate 22, but rather at the lower side of the connection means 30, i.e. in its base section 50. A bolt 62 pushed into the cutout 60 and acting as a counter-placement centration means 62 of the undercarriage 12 can likewise be recognized. A flatter elongate region 61 is located beside the circular lower region of the cutout 60. On the alignment of the counterweight base plea 22, the introduction chamfer of the bolt 62 is first introduced into the elongate region 61 of the cutout. There is hereby already one degree of freedom fewer present for the correct positioning of the counterweight base plate 22. The bolt 62 is then guided in the elongate region 61 until the deeper region 60 of the cutout has been reached and the counterweight base plate 22 can be let down into its correct position.

REFERENCE NUMERAL LIST

[0120] 10 mobile crane [0121] 12 undercarriage [0122] 13 axis of rotation [0123] 14 superstructure [0124] 16 boom [0125] 18 placement device [0126] 20 counterweight device [0127] 21 ballast frame [0128] 22 counterweight base plate [0129] 23 ballasting cylinder [0130] 24 counterweight element [0131] 30 connection means [0132] 31 attachment means/recess [0133] 32 placement area [0134] 34 centering means [0135] 35 fastening section [0136] 36 fastening means [0137] 37 bolt mount [0138] 38 coupling region [0139] 39 recess [0140] 40 recess [0141] 41 opening [0142] 42 cover (metal cover sheet) [0143] 44 screw [0144] 45 projection [0145] 46 wall [0146] 48 cutout [0147] 50 base section [0148] 52 middle section [0149] 54 coupling section [0150] 60 placement centering means (cutout) [0151] 61 elongate region [0152] 62 counter-placement centering means [0153] 70 stabilization metal plate [0154] 71 opening [0155] 72 bolt [0156] 80 pivot part [0157] 82 central ballast