Telescopic and mobile cranes

Abstract

The invention relates to a telescopic boom and a mobile crane, in particular a telescopic boom with an articulated section, at the side of which at least two luffing cylinder receptacles are provided for fastening luffing cylinders to the telescopic boom. The support plates of the luffing cylinder receptacles enter into a sheet metal box structure consisting of three partial luffing cylinder boxes.

Description

Technical Field

[0001] The invention relates to a telescopic arm with an articulated section, which is used for a crane, in particular a mobile crane, wherein at least two luffing cylinder receptacles are arranged on the side of the telescopic arm for fixing the luffing cylinders to the telescopic arm. Background Art

[0002] For example, DE 10 2017 110 412 A1 discloses a mobile crane in which a centrally arranged luffing cylinder can be fastened to the articulated section of the telescopic boom via a bolt receptacle. The load is transferred via the bolt receptacle into the lower housing of the boom profile, where a special sheet metal structure is provided. Although a single centrally arranged luffing cylinder is sufficient for many cranes, it is common practice for large cranes to use two luffing cylinders.

[0003] Figure 1 and Figure 2a A corresponding conventional solution for a luffing cylinder housing in a large crane based on the prior art is shown. Two luffing cylinders, not shown in detail here, swing on a self-enclosed luffing cylinder box 3 consisting of a sheet metal structure at two force introduction points 33 of the articulated section 1 and on the entire telescopic boom (only partially shown in the figure). The force introduction points 33 are arranged in a support plate, which, with its sheet metal box structure, transfers the load from the luffing cylinder housing to the structure of the articulated section 1 of the telescopic boom. The main part of the force is introduced into the soft lower shell of the articulated section 1. At the connection between the cover plate 31 and the lower shell of the articulated section 1 and the side plates 32, the opposite sharp corners of the luffing cylinder box 3 are formed. Figure 1 The angle marked with A in the figure can cause problems, especially at the torque angle involved, because the maximum permissible force transmission via the luffing cylinder box 3 is limited. The torque angle is caused by permissible loads, such as wind or inclination of the entire crane. If the sheet metal box structure is loaded only in the luffing plane of the telescopic boom for load transmission, the torque angle must be set to 0 degrees. If disturbing forces, such as wind, push the telescopic boom out of the luffing plane, the torque angle increases and the entire telescopic boom is additionally loaded. In particular, as the torque angle increases, the above-mentioned sharp angle in area A proves to be problematic. Summary of the invention

[0004] The object of the invention is to achieve a higher load-bearing capacity of the sheet metal box structure and the articulated section while reducing the weight and thus achieving a higher load-bearing capacity of the entire boom. At the same time, the permissible load achieved should also be robust against disturbances such as wind or tilting of the entire crane.

[0005] According to the invention, this object is achieved according to one aspect of the invention. Therefore, at least two luffing cylinder receptacles, in particular bolt receptacles, are provided on the side of the telescopic arm for fastening the luffing cylinders to the telescopic arm. The support plates of the luffing cylinder receptacles enter the sheet metal box structure for transferring the loads from the luffing cylinder receptacles to the structure of the telescopic arm. According to the invention, the sheet metal box structure consists of three partial luffing cylinder boxes, two of which are arranged parallel to the articulation section and opposite each other in the side area of ​​the lower housing essentially below the side wall, while the third partial luffing cylinder box extends transversely to the articulation section.

[0006] The partial luffing cylinder box aligned parallel to the articulation section is arranged in such a way that the majority of the forces are introduced into the rigid profile web wall of the articulation section. This is achieved by means of the two side risers of the partial luffing cylinder box. A further increase in rigidity and thus in load-bearing capacity is achieved by means of the partial luffing cylinder box extending transversely to the articulation section.

[0007] A preferred embodiment of the present invention results from another aspect of the present invention.

[0008] Particularly advantageously, the three partial luffing cylinder boxes can each be designed as a closed box structure with two side walls, a cover plate and corresponding end plates. The upper side plates of the partial luffing cylinder boxes extending in parallel can also be composed of a plurality of partial plates.

[0009] The third partial luffing cylinder box extending transversely to the articulation section is preferably connected to the end of the luffing cylinder box opposite the end with the luffing cylinder receptacle. To increase stability, the third luffing cylinder box is welded to the parallel luffing cylinder boxes.

[0010] According to another preferred embodiment of the invention, the plates of the essentially parallel partial luffing cylinder boxes can at least partially penetrate the plates of the third partial luffing cylinder box. The side plates or upright plates of the parallel partial luffing cylinder boxes continue as subsequent side plates or upright plates in the transverse partial luffing cylinder box. By welding these mutually penetrating sheet metal structures, a particularly high stability can be achieved.

[0011] Preferably, the anti-buckling reinforcement ribs formed on the lower shell of the articulated section extend only into the partial luffing cylinder box extending transversely to the articulated section. In order to improve the strength, the ends of the anti-buckling reinforcement ribs can be welded to the partial luffing cylinder box.

[0012] Finally, according to another advantageous embodiment, a further sheet metal box structure can be connected to the luffing cylinder boxes arranged parallel to one another below the lower housing of the articulated section. In this case, the further sheet metal box structure is arranged substantially parallel to the third luffing cylinder box. Here, too, the strength is increased by welding to the two luffing cylinder boxes parallel to one another.

[0013] Particularly advantageously, the center of the additional sheet metal box structure can be defined in the area between the two partial luffing cylinder boxes and the additional sheet metal box structure can be at least partially connected in its center to the lower housing of the articulated section, preferably also welded. The connection is only slightly pressed into the lower housing. Essentially, this additional sheet metal box structure reinforces the two luffing cylinder receptacles representing the force introduction points to one another. In addition, the stabilizing forces can now be absorbed by the lower housing perpendicular to the longitudinal axis of the articulated section. The lower housing is particularly load-bearing in this direction.

[0014] Finally, the invention also relates to a crane, in particular a mobile crane, having at least one telescopic boom having the above-described features.

[0015] The sheet metal box structure according to the invention, which is composed of three partial luffing cylinder boxes, transmits the main forces to the articulated sections. The articulated sections are bent outside around the connection points of the sheet metal box structure. In contrast to the solutions according to the prior art described at the outset, it is particularly advantageous here that no sharp corners are formed in the region of the lower shell, which represent weak areas for buckling of the sheet metal. Such sharp transition corners are thus avoided, the stability is increased and the load-bearing capacity is increased, while the entire structure is relatively light. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] With reference to the accompanying drawings, other features, details and advantages of the present invention are derived from the following detailed description of preferred embodiments, in which:

[0017] Figure 1 : is a detailed illustration of a telescopic arm according to the prior art,

[0018] Figure 2a :Based on Figure 1 A side view of the articulated section of

[0019] Figure 2b : is a side view of an articulated section according to an embodiment of the present invention,

[0020] Figure 3 : is a detailed illustration of a perspective view of an articulated section,

[0021] Figure 4 :Based on Figure 3 A side view of a detail of an articulated section,

[0022] Figure 5a :Based on Figure 3 Bottom view of the detail of the hinged section,

[0023] Figure 5b :For the Figure 5a , in which the cover plates of some of the luffing cylinders are partially omitted, and

[0024] Figure 6:Based on Figure 3 Detailed illustration of the front view. DETAILED DESCRIPTION

[0025] Figure 2b The articulated section 1 of a telescopic boom according to an embodiment of the invention is shown. Here, a lateral luffing cylinder receptacle 33 is provided in the form of a bolt receptacle as a force introduction point. A luffing cylinder (not shown in detail here) is articulated on the luffing cylinder receptacle 33, which is used in a known manner to extend and retract the telescopic boom upward and downward.

[0026] In the present case, due to the large crane, a corresponding luffing cylinder receptacle 33 is provided on each side. The support plates of the luffing cylinder receptacles are transferred into the sheet metal box structure 3 for transferring the loads from the luffing cylinder receptacles 33 to the structure of the telescopic boom.

[0027] A more precise construction of the sheet metal box structure will be referred to Figure 3 , 4 , 5a, 5b and 6. The sheet metal box structure 3 thus consists of three partial luffing cylinder boxes 40, 50, 60, two of which are arranged parallel to each other in the lateral region of the lower shell of the articulated section 1, substantially below the side wall 11 (see in particular Figure 6 ).

[0028] In addition, a third partial luffing cylinder box 60 is arranged transversely to the articulated section 1, for example Figure 3 As can be seen in the figure, the partial amplitude cylinder boxes 40, 50 transmit most of the force to the rigid profile mesh wall of the articulated section 1. This is achieved through two vertical plates 41, 42 (see Figure 3 Here, as shown here, the higher steel plate reaching the outer wall can also be composed of several partial steel plates 41, 41' (see Figure 4 ). The two partial luffing cylinder boxes 40, 50 represent closed boxes and have cover plates 43, 44. Suitable end plates may also be provided.

[0029] The partial luffing cylinder box 60 extends transversely to the telescopic boom section 1. The luffing cylinder box 60 also has uprights 61, 62. In order to form a closed box-like structure here as well, a cover plate 63 is also provided.

[0030] Most covers are Figure 5b It can thus be seen that the partial luffing cylinder boxes 40, 60 are partially penetrated, just like the partial luffing cylinder boxes 50, 60. Therefore, after welding the two partial luffing cylinder boxes 40 and 60 together, the upright plate 42 in the partial luffing cylinder box 60 is continued via the upright plate 42'.

[0031] from Figure 3It can be seen in detail that the parallel-running anti-buckling reinforcements 12, 13 arranged in the articulated section 1 stop on the partial luffing cylinder box 60 and are welded to it. The anti-buckling reinforcements 12, 13 that continue in the area of ​​the luffing cylinder box are not necessary, because this itself provides sufficient stability against bulging.

[0032] In particular, from Figure 3 and from Figure 6 As can be seen in the figure, a further sheet metal box structure 70 is additionally designed as a stable additional box. It is also a completely closed box-shaped sheet metal box structure. Therefore, there are side plates and a cover plate. The sheet metal box structure 70 stiffens the entire sheet metal box structure 3 and connects the two partial luffing cylinder boxes 40, 50 to each other. Figure 6 It can be clearly seen in the figure that in the middle M it is connected to the relatively soft lower shell of the articulated section 1. The connection is only slightly pressed into the lower shell. It essentially reinforces the two luffing cylinder receptacles 33, i.e. the force introduction points, to each other. In addition, stabilizing forces perpendicular to the longitudinal axis of the articulated section 1 can also be absorbed by the lower shell. The lower shell is particularly load-bearing in this direction.

Claims

1. A telescopic arm having an articulated section (1), wherein at least two luffing cylinder accommodating parts (33) are arranged on the side of the telescopic arm, wherein the luffing cylinder accommodating parts are used to fasten the luffing cylinders to the telescopic arm, wherein the supporting plates of the luffing cylinder accommodating parts are sheet metal box structures and are used to transfer loads from the luffing cylinder accommodating parts to the structure of the telescopic arm, It is characterized in that The sheet metal box structure consists of three partial luffing cylinder boxes (40, 50, 60), two of which are arranged opposite each other in parallel to the articulated section (1) in a side area of ​​the lower shell substantially below the side wall (11), and the third partial luffing cylinder box (60) extends transversely to the articulated section (1).

2. The telescopic arm according to claim 1, characterized in that: The three partial amplitude-changing cylinder boxes (40, 50, 60) are respectively constructed as closed box structures with two side walls, a cover plate and an end plate.

3. A telescopic arm according to any one of the preceding claims, characterised in that The third partial luffing cylinder box (60) is connected to the end of the luffing cylinder box (40, 50) opposite to the end having the luffing cylinder accommodation portion (33).

4. The telescopic arm according to claim 3, characterized in that: The third partial luffing cylinder box (60) is welded to the luffing cylinder boxes (40, 50).

5. The telescopic arm according to claim 4, characterized in that: The substantially parallel plates of the partial luffing cylinder boxes (40, 50) at least partially penetrate the plates of the third partial luffing cylinder box (60).

6. The telescopic arm according to claim 1, characterized in that: At least one anti-buckling reinforcement rib (12, 13) is formed on the lower shell of the articulated section (1), and the at least one anti-buckling reinforcement rib (12, 13) only extends to the partial luffing cylinder box (60) extending transversely to the articulated section (1).

7. The telescopic arm according to claim 6, characterized in that: At least one anti-buckling reinforcement rib (12, 13) is formed on the lower shell of the articulated section (1), and the at least one anti-buckling reinforcement rib (12, 13) is welded to the partial luffing cylinder box (60).

8. The telescopic arm according to claim 1, characterized in that: A further sheet metal box structure (70) connects the partial luffing cylinder boxes (40, 50) arranged parallel to one another below the lower housing of the articulated section (1).

9. The telescopic arm according to claim 8, characterized in that: The center (M) of the further sheet metal box structure (70) is defined between two mutually adjacent partial luffing cylinder boxes (40, 50), and the center (M) of the further sheet metal box structure (70) is connected to the lower shell of the articulated section (1).

10. A crane having at least one telescopic boom according to any one of the preceding claims.

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