Limiting arrangement for limiting a swivel range

Abstract

The invention relates to a limiting arrangement (14) for limiting the swivel range (W) of a crane boom (11). The crane boom (11) is pivotably mounted on a support (12) about a swivel axis (S). The swivel axis (S) can be vertically oriented. The limiting arrangement (14) has a disk (22) that is fixed relative to the swivel axis (S). A groove (23) in the disk (22) surrounds the swivel axis (S) in an arc. At least one stop unit (31), each with at least one stop element (44), can be arranged along the groove (23) in a desired position to limit the swivel range (W) of the crane boom (11) by means of the at least one stop element (44). Each stop unit (31) has a locking element (32) that can be switched between a locking position (I) and a release position (II).In its locked position (I), the locking element (32) prevents relative movement between the stop unit (31) and the disc (22) in the direction of extension (E) of the groove (23). In the released position (II), the stop unit (31) can be moved along the direction of extension (E) of the groove (23).

Description

[0001] The invention relates to a limiting device for restricting the slewing range of a crane boom. Rollers, winches, motors, or similar components can be arranged on the boom to lift a load. The crane boom is pivotally mounted about a pivot axis.

[0002] It may be desirable to limit the swivel angle of the boom in order to restrict the movement of the boom and any load held on it to a swivel range.

[0003] A slewing limiting arrangement for slewing cranes with a hydraulic slewing drive is known from DD 1 60 220 A3. Solenoid valves can be switched via limit switches in the hydraulic circuit, thereby limiting the slewing movement. However, such a limiting arrangement requires a hydraulic drive to slew a crane boom.

[0004] Another device for limiting the slewing range of a column jib crane is described in DE 80 17 456 U1. A vertical column is rotatably mounted inside a support tube by means of a rolling bearing. A ring flange is provided on the support tube, around which a chain is guided and tensioned by means of a threaded tensioning device. Stops are arranged on two chain links. Braking devices are provided on the vertical support tube. When a slewing range limit is reached, these devices contact the stops arranged in the chain and press a brake pad of the braking device against the ring flange, thereby braking the slewing movement. This crane has a mechanically complex design. Furthermore, a slewing angle range can only be set with limited precision using friction braking, since the moment of inertia varies depending on the load weight held by the crane, and the braking effect is therefore load-dependent.

[0005] US 2018 / 0354758A1 describes a crane with a crane boom whose slewing angle can be limited by mechanical stops that can be attached to a column of the crane by means of a mounting ring.

[0006] Based on the prior art, the object of the invention can be considered to be to create a limiting arrangement for limiting a swivel angle range of a crane boom, which enables a simple design and easy handling for changing the swivel angle range.

[0007] This problem is solved by a limiting arrangement with the features of claim 1. The limiting arrangement according to the invention is designed to limit a swivel range or swivel angle range of a crane boom. The crane boom is pivotably mounted on a support of the crane about a swivel axis. The swivel axis is, in particular, vertically oriented. The crane support can also be vertically oriented.

[0008] The limiting arrangement has a disk with an arc-shaped groove. The groove can, in particular, have a circular arc shape. The arc-shaped groove extends around the pivot axis. The angular range along which the groove extends around the pivot axis is less than 360° and preferably a maximum of 270°. The angular range along which the groove extends around the pivot axis can, for example, be at least 90°, at least 120°, or at least 180°.

[0009] The groove passes completely through the disc and thus forms an arc-shaped slot in the disc.

[0010] At least one stop unit (preferably exactly two stop units) with a locking element is arranged on the disc. The locking element can be switched between a release position and a locking position, for example by a relative movement relative to the disc. The relative movement can be, for example, a linear movement, a pivoting movement, a rotary movement, or a combination thereof. In a preferred embodiment, the switching movement of the locking element between the release position and the locking position—and vice versa—is a linear movement that can be oriented essentially perpendicular to the plane of extension of the disc and / or parallel to the pivot axis.

[0011] In the released position of the locking element, the relevant stop unit can be moved with the locking element in one direction of extension of the groove relative to the disk. The stop unit can be guided in the groove, in particular by means of the locking element.

[0012] In contrast, when the locking element is in the locked position, movement of the respective stop unit in the direction of the groove relative to the disk is prevented. In the locked position, the locking element can be held to the disk, and particularly in the groove, by a positive locking and / or frictional engagement, for example, by a detent-like connection between the locking element and a section of the groove or the disk that defines the groove. A positive locking or detent connection in the locked position is preferred because it reliably prevents accidental movement of the stop unit along the direction of the groove relative to the disk.

[0013] In the blocking position of the blocking body, at least one stop body of the stop unit projects into the swivel range of the crane boom in order to limit the swivel range of the crane boom.

[0014] In the locking position of the locking element, the relevant stop unit can preferably be rotatably mounted on the disc about an axis of the stop unit. This axis extends essentially perpendicular to the disc and can be aligned parallel to the pivot axis of the crane boom. This allows the at least one stop element of the stop unit to be rotated or pivoted about the axis when it comes into contact with the crane boom to limit the pivoting movement.

[0015] The disc and at least one anchor point are located in the connection area between the crane boom and the support (i.e., in the area of ​​the crane boom's pivot bearing). This mounting position is typically far enough away from the ground that there is no risk of a person trapping a body part between the crane boom and the at least one anchor point of an anchor point.

[0016] It is advantageous if the disc is detachably attached to the support or can be attached in a detachable manner. A fastening device can be used for this purpose, which, for example, creates a positive-locking and / or friction-locking connection or clamping connection between the disc and the support. For instance, contact or clamping surfaces can be pressed against an outer surface of the support by means of tie rods, screw connections, or other devices, thus creating a friction-locking or friction-locking connection for the disc. This eliminates the need for special features on the support (such as mounting recesses, holes, etc.) for attaching the disc.

[0017] Each stop unit can have a preloading device. The preloading device generates a preload force. This preload force forces the locking element into the locked position. It can be moved into the released position, particularly against the preload force, for example, using an operating tool. Optionally, a stop unit whose locking element is in the released position can also be moved along the groove relative to the disc using such an operating tool.

[0018] The mounting height of a disc relative to the substrate can vary and may be so high that it is not reachable by hand by an operator standing on the substrate. To allow access to the stop unit from the substrate, the preferably rod-shaped operating tool can be sufficiently long. Optionally, the length of the operating tool can be variable or adjustable, for example, by means of a length-adjustable rod. The rod can have several sections arranged telescopically, or the number of interconnected sections can be changed.

[0019] In a preferred embodiment, the groove has several positioning areas along its direction of extension. Two positioning areas that are immediately adjacent in the direction of extension are connected to each other by a transition area. In the positioning areas, the locking element can be arranged such that it forms a positive-locking connection with the disk and is therefore not movable relative to the disk in the direction of extension of the groove – that is, the locking element assumes its locking position.

[0020] Perpendicular to the groove's direction of extension, the positioning areas can have a first groove width and the transition areas a second groove width. The first groove width is larger than the second groove width.

[0021] It can be advantageous for the locking element to have a locking portion and a release portion. Viewed transversely to the direction of the groove, the locking portion has a locking portion width. Transversely to the direction of the groove, the release portion can have a release portion width that is smaller than the locking portion width. The locking portion width is at most as large as the first groove width, so that the locking portion can be positioned within the positioning areas inside the groove. The locking portion width is larger than the second groove width of the transition areas, so that the locking portion cannot be moved from a positioning area into a transition area in the direction of the groove.

[0022] The release section width is at most as large as, and preferably smaller than, the second groove width, so that the release section can be moved in the direction of extension of the groove when it is positioned within the groove, for example, in the release position of the locking element. The release section can be moved in the direction of extension of the groove from a positioning area into a transition area.

[0023] In both the locked and unlocked positions of the locking body, the relevant stop unit is held against the disc and cannot be completely removed from the disc even in the unlocked position without dismantling the stop unit.

[0024] It is advantageous if the limiting arrangement includes an operating tool, and in particular an operating rod. The operating rod can have a gripping area at one end where it can be held by an operator. At the opposite end, the operating tool or operating rod can have a holding device. The holding device is designed to be detachably connected to a stop unit, in particular by frictional and / or positive locking. When the connection is established, the locking element of the respective stop unit can be moved. The holding device can, for example, be magnetically coupled to the stop unit, and in particular to the locking element, by the magnetic force of a holding magnet.

[0025] In one embodiment, the limiting device can include at least one light-emitting unit. This light-emitting unit can be attached to a mooring point or the crane boom. The at least one light-emitting unit is configured to project a marking onto a surface. This marking indicates the crane boom's swing range to an operator. This makes it very easy to check whether the at least one mooring point is correctly positioned and whether the crane boom's swing range is limited to a safe range.

[0026] The at least one light emission unit comprises a light source, which may be assigned to a single light emission unit or to several light emission units. It is possible to arrange the light source directly as part of the light emission unit on the crane boom or the lifting unit, or to arrange it remotely from the light emission unit and then establish an optical connection between the light source and the light emission unit, for example by means of a fiber optic cable or other light guiding device. A light source arranged remotely from the light emission unit has the advantage that it can be positioned sufficiently close to the ground to be operated by a person standing on the ground, even if the lifting unit or the crane boom is not accessible to the operator without aids (e.g., operating tools, ladders, etc.).

[0027] Advantageous embodiments of the invention will become apparent from the dependent claims, the description, and the drawing. Preferred embodiments of the invention are shown in the drawing and explained below. The drawing shows: Fig. 1 a schematic view of an embodiment of a limiting arrangement in a state of use attached to a crane, Fig. 2 the embodiment of the limiting arrangement from Fig. 1 in a schematic top view along a pivot axis of the crane, Fig. 3 A schematic representation of an exemplary embodiment of a stop unit of the limiting arrangement according to the Fig. 1 and Fig. 2 in a blocking position, Fig. 4 the stop unit from Fig. 3 in a release position, Fig. 5 An enlarged schematic representation of a section of a groove in a disk of the boundary arrangement according to the Fig. 1 and Fig. 2, as well as a partial representation of a blocking body of the impact units from the Fig. 3 and Fig. 4 in a top view, Fig. 6 a modified embodiment of the limiting arrangement in a representation according to Fig. 1.

[0028] In the Fig. 1 and Fig. Figure 6 schematically illustrates a crane 10. The crane 10 has a crane boom 11 pivotally mounted about a pivot axis S. The crane boom 11 can, for example, be pivotally mounted on a support 12 of the crane 10. In the exemplary embodiment, the support 12 extends essentially vertically upwards from a base 13.

[0029] The crane 10 can be used, for example, to lift and move loads in a factory hall or on company premises. The support 12 can be stationary on the base 13, e.g., firmly anchored to the base 13. It can optionally have an additional load-bearing or support function, such as supporting a wall and / or a roof and / or another part of the hall. Alternatively, the support 12 can be positioned or moved along the base 13, for example, mounted on a mobile crane trolley.

[0030] To achieve a swivel range W ( Fig. 2) To limit the movement of the crane boom 11 around the pivot axis S, a limiting device 14 is provided. The limiting device 14 has a fastening device 15 by means of which the limiting device 14 can be detachably attached to the crane 10, in particular to the support 12 on which the crane boom 11 is pivotably mounted. In the exemplary embodiment, the fastening device 15 has at least one plate 16, which has a contact surface 17. The contact surface 17 faces the support 12 and rests against the support 12 when mounted. In the exemplary embodiment, two plates 16, each with a contact surface 17, are provided. Instead of the plates 16, other contact bodies, each with a contact surface 17, could be used. The contact surfaces 17 preferably extend in different planes, for example, at right angles to each other.

[0031] The fastening device 15 also has a force-generating unit 18 to press, for example pull, the at least one contact surface 17 against the support 12 and thereby establish a force-fit connection. The force-generating unit 18 can, for example, comprise at least one screw connection, at least one tie rod 19, at least one clamping device, or the like. As shown schematically in the Fig. 1 and Fig. As can be seen in Figure 2, the force-generating unit 18 in the exemplary embodiment has several tie rods 19, with at least one tie rod 19 being oriented obliquely or perpendicularly to an existing contact surface 17. The contact surfaces 17 and the tie rods 19 completely enclose the support 12. The contact surfaces 17 are pulled against the support 12 by means of the tie rods 19.

[0032] The limiting arrangement 14 has a disk 22 which is held on the support 12 by means of the fastening device 15. In the exemplary embodiment, the disk 22 is permanently connected to the plates 16 of the fastening device 15, for example by a welded connection. Alternatively, the at least one plate 16 and the disk 22 can also form a common integral, monolithic body.

[0033] When the limiting arrangement 14 is mounted, the disk 22 is aligned at least substantially perpendicular to the pivot axis S. As shown in the Fig. 1 and Fig. As can be seen schematically in Figure 2, the pivot axis S passes through the disc 22. The installation height of the disc 22 above the base 13 is, for example, so high that a person standing on the base 13 cannot reach the disc 22 without additional aids.

[0034] The disk 22 has an arc-shaped groove 23. In the exemplary embodiment, the groove 23 extends completely through the disk 22, thus forming a slot. Preferably, the groove 23 is arc-shaped. The arc-shaped groove 23 extends around the pivot axis S, for example, in an angular range of approximately at least 90° or at least 180° and up to 250° or up to 270°.

[0035] In the groove 23, several positioning areas 24 are formed adjacent to one another along the arc-shaped direction of extension of the groove 23, wherein two positioning areas 24 immediately adjacent to each other in the direction of extension of the groove 23 are each connected to one another by a transition area 25. Perpendicular to the direction of extension of the groove 23, the positioning areas 24 each have a larger first groove width b1 compared to a second groove width b2 of the transition areas 25 ( Fig. 5) The transition areas 25 thus represent constrictions where the width of the groove 23 is reduced perpendicular to the extension direction E of the groove 23 compared to the positioning areas 24.

[0036] In the embodiment illustrated here, each positioning area 24 of the groove 23 has a circular contour bounded by two arcuate edge sections 26 of the disk 22. The two arcuate edge sections 26 are arranged opposite each other at right angles to the direction of extension E of the groove 23. In this embodiment, they lie on a common virtual circle with a diameter corresponding to the first groove width b1.

[0037] Two adjacent edge sections 26 in the extension direction E of the groove, which define immediately adjacent positioning areas 24, form an edge projection 27 projecting at right angles to the extension direction E of the groove 23. In the exemplary embodiment, two edge projections 27 opposite each other transversely to the extension direction E of the groove 23 each form a transition area 25, where the width of the groove 23 is reduced and corresponds to the second groove width b2.

[0038] As shown schematically in Fig. As can be seen in Figure 2, the two positioning areas 24, which are located at opposite ends of the groove 23 in the direction of extension E, are connected to a single adjacent positioning area 24 only via a transition area 25, whereas all other positioning areas 24 arranged between them are each connected to two immediately adjacent positioning areas 24 in the direction of extension E of the groove 23 via two transition areas 25. At the two end-facing positioning areas 24, the edge areas 26, which are opposite each other perpendicular to the direction of extension E, merge directly into one another in order to delimit the groove 23 in the direction of extension E on one side.

[0039] On the disc 22, stop units 31 are arranged that can be positioned in the extension direction E of the groove 23. Each stop unit 31 limits the swivel range W of the crane boom 11 in one swivel direction, so that two stop units 31 are sufficient.

[0040] An embodiment of the stop unit 31 is shown schematically in the Fig. 3 and Fig. Figure 4 illustrates this. Each stop unit 31 has a blocking element 32 that projects into the groove 23. In the Fig. 3 and Fig. 4 the groove 23 in the disc 22 is only schematically represented by a groove flank or a groove edge with the edge sections 26 and the edge projections 27 in order to better explain the function of the stop units 31 and the blocking body 32.

[0041] The locking body 32 extends along an axis A. In the exemplary embodiment, the axis A is oriented perpendicular to the disk 22 and can therefore be aligned parallel to the pivot axis S. Viewed parallel to the axis A, the locking body 32 has a locking part 33 and a release part 34 that is directly or indirectly connected to the locking part 33. Viewed perpendicular to the direction of extension E, the locking part 33 has a locking part width c and the release part 34 has a release part width d, as shown schematically in Fig. 5 can be seen.

[0042] In the embodiment illustrated here, the blocking part 33 and / or the releasing part 34 can be cylindrical and extend coaxially to axis A. The blocking part width c can therefore be defined by the diameter of the cylindrical blocking part 33, and the releasing part width d by the diameter of the cylindrical releasing part 34.

[0043] The blocking element width c is greater than the second groove width b2 and at most as large as the first groove width b1. The blocking element 33 can therefore be arranged in the positioning areas 24 of the groove 23, but not in the transition areas 25, since its blocking element width c is greater than the second groove width b2 in the transition areas 25. If the blocking element 33 is arranged in a positioning area 24, the blocking element 32 cannot be moved in the extension direction E of the groove 23 into an adjacent positioning area 24 because it is held in the positioning area 24 in which it is currently arranged by the adjacent narrower transition areas 25 or the edge projections 27.

[0044] The release section width c is at most as large as the second groove width b2 and preferably at least slightly smaller, so that the release section 34 of the blocking body 32 can be moved in the extension direction E of the groove 23 along the entire groove 23.

[0045] The locking element 32 of each stop unit 31 can be switched between locking position I and release position II, and in particular moved from locking position I to release position II, or vice versa, by a switching movement. In locking position I, the locking element 33 is located within a positioning area 24 of the groove 23 ( Fig. 3) This secures the locking element 32, and thus the stop unit 31, against relative movement to the disk 22 in the direction E of extension of the groove 23. In the release position II, the locking element 33 is located outside the groove 23, and the release element 34 extends into and, for example, completely through the groove 23. Due to the smaller dimensions of the release element 34 compared to the locking element 33, it can be moved along a transition area 25 from one positioning area 24 to the next in order to position the stop unit 31 at a desired position in the groove 23. In the desired position of the stop unit 31, the locking element 32 can then be moved again from the release position II to the locking position I, so that the stop unit 31 is secured against unwanted relative movement to the disk 22 in the direction E of extension of the groove 23.

[0046] In the locking position I, the stop unit 31 can be rotated about the axis A relative to the disk 22. This rotatable mounting is achieved, for example, by having the edge sections 26, which define a positioning area 24 of the groove 23, lie on a common rotationally symmetric, virtual contour (for example, a virtual circular path) and / or by having the locking part 33 have a rotationally symmetric contour. In a modification of the preferred embodiment, it is sufficient if either the virtual contour of each positioning area 24 or the contour of the locking part 33 is rotationally symmetric about the axis A. For example, the virtual contour of each positioning area 24 can be polygonal, and the contour of the locking part 33 about the axis A can be cylindrical or frustoconical. In principle, many contour geometries are possible, which are readily apparent to those skilled in the art.

[0047] In the preferred embodiment of the stop unit 31, the blocking element 32 is forced or pre-tensioned into the blocking position I by means of a pre-tensioning device 38. The pre-tensioning device 38 is configured to generate a pre-tensioning force F that acts on the blocking element 32 and forces the blocking part 33 into the groove 23 or into one of the positioning areas 24 ( Fig. 3) For this purpose, the preloading device 38 can have at least one spring 39, for example a coil spring. In addition to or as an alternative to the spring 39, the preloading device 38 can also have other elastically deformable bodies to generate the preload force F.

[0048] In this embodiment, the spring 39 is arranged in the region of the release element 34 when viewed along axis A. The spring 39, designed as a helical spring, surrounds the release element 34. In this embodiment, the spring 39 is supported, either directly or indirectly, on the disc 22 and, on the other hand, directly or indirectly, on a support element 40 of the stop unit 31. The support element 40 is, for example, connected to the release element 34 and arranged along axis A at a distance from the blocking element 33. The release element 34 connects the support element 40 to the blocking element 33. The support element 40 can, for example, be designed in the form of a screw head and / or be disc-shaped.

[0049] Preferably, a support ring 41 is arranged between the spring 39 and the disk 22. The support ring 41 slides against the disk 22 and is pressed against the disk 22 by the preload force F of the spring 39. The dimension of the support ring 41 transverse to the direction E of the groove 23 is, for example, larger than the first groove width b1.

[0050] The spring 39 is, for example, under compression and pushes the support ring 41 and the support element 40 away from each other. Since the support ring 41 rests against the disk 22, the preload force F of the preloading device 38 or the spring 39 exerts a preload force F on the locking element 32 parallel to the axis A, thus pushing the support element 40 away from the disk 22. This forces the locking element 33 into the groove 23 or one of the positioning areas 24 and, for example, pulls it.

[0051] The lifting unit 31 has at least one lifting body 44. The lifting body 44 can be an elastically deformable body, for example, made of an elastomeric material, rubber material, or the like. In the correctly assembled state of the limiting arrangement 14, the at least one lifting body 44 is associated with or facing the crane boom 11. In the locking position I of the lifting unit 31, the at least one lifting body 44 of the respective lifting unit 31 is located within the pivoting range of the crane boom 11. The crane boom 11 can therefore only pivot about the pivot axis S up to the at least one lifting body 44 of the respective lifting unit 31 and thus rests against the at least one lifting body 44 of the respective lifting unit 31 in the outermost pivot position of the pivoting range W.If two lifting units 31 are present, as is preferably the case, the crane boom 11 can therefore only be swivelled in the area between the lifting bodies 44 of the lifting units 31, thus limiting the swivel range W.

[0052] In the embodiment illustrated here, the at least one stop element 44 of each stop unit 31 is connected to the blocking element 32 via a connecting element 45. The connecting element 45 is, in particular, fixedly attached to the blocking element 32. In this embodiment, the connecting element 45 is designed as an angle element.

[0053] The connecting element 45 has a connecting surface 46 on its side facing the disk 22, which rests against the disk 22 in the blocking position I of the blocking body 32 ( Fig. 3) The connecting element 45, or the connecting surface 46, has a dimension perpendicular to the direction of extension E of the groove 23 that is at least partially larger than the first groove width b1, so that the connecting surface 46 projects beyond the locking part 33 at least in some places when viewed perpendicular to the axis A. The position of the locking part 33 in the locking position I can be defined by the connecting surface 46. In the locking position I, the connecting surface 46 is pressed against the disc 22 by the preload force F and, for example, pulled.

[0054] In the release position II, the connecting element 45 or the connecting surface 46 is arranged at a distance from the disk 22 ( Fig. 4).

[0055] Due to the preloading device 38, and in particular the support ring 41 on the one hand and the connecting element 45 on the other, the stop unit 31 is held against the disk 22, regardless of whether the locking body 32 is in locking position I or release position II. The stop unit 31 is therefore not removable from the disk 22 without first being disassembled and, for example, the connecting element 45 or the support part 40 being removed from the locking body 32. However, such disassembly is neither necessary nor intended for switching between locking position I and release position II. Rather, the stop unit 31 is, so to speak, secured against unintentional removal from the disk 22 – even though the stop unit 31 can be moved relative to the disk 22 in release position II.

[0056] The at least one stop element 44 of each stop unit 31 is arranged parallel to axis A at a distance from the release element 34. Viewed from the disk 22, in blocking position I, the release element 34 is located on one side and the at least one stop element 44 on the other side of the disk 22. For example, in blocking position I, the release element 34 can be located above the disk 22 and the at least one stop element 44 below the disk 22 if the disk 22 is mounted above the crane boom 11 on the support 12. Conversely, if the disk 22 is mounted below the crane boom 11 on the support 12, the at least one stop element 44 is located above the disk 22 when the limiting arrangement 14 is mounted.In any case, at least one stop element 44 of each stop unit 31 is positioned within the swivel range of the crane boom 11 when the stop unit 31 is in the locking position I, so that during a swivel movement about the swivel axis S, the crane boom 11 rests against the at least one stop element 44 of the respective stop unit 31 at the edge of the swivel range W and cannot be deflected further. The limitation of the swivel range W by two stop units 31, each with at least one and, by way of example, two stop elements 44, is shown schematically in . Fig. 2 shown.

[0057] Typically, the crane boom 11 is located at a height above the ground 13 that cannot be reached by an operator standing on the ground 13 without assistance (for example, a ladder or the like). To enable an operator standing on the ground 13 to adjust the slewing range W, the limiting device 14 preferably includes an operating tool 47, which may, for example, be rod-shaped. A rod-shaped part of the operating tool 47 may have a variable length and, for example, be telescopic.

[0058] The operating tool 47 has a gripping area 48 at one end of its rod-shaped portion, where an operator can grasp the operating tool 47. At the opposite end, the operating tool 47 has a coupling device 49 by means of which the operating tool 47 can be detachably connected or coupled to the stop unit 31 and, in particular, to the locking element 32, in order to move the locking element 32 from the locking position I against the preload force F into the release position II, as shown schematically in Fig. 4 is shown.

[0059] The coupling device 49 can, for example, include a magnet 50 which can be magnetically connected or coupled to the locking element 32, either directly or indirectly. The magnetic force is defined such that it is greater than the preload force F acting in the release position II, so that, when the coupling is established, the locking element 32 can be moved into the release position II against the preload force F.

[0060] In a variation of the illustrated embodiment, the coupling device 49 could, instead of or in addition to the magnet 50, also have coupling elements that can be detachably connected to the locking body 32, either directly or indirectly, in a form-fitting manner, such as hooks, gripping fingers, or the like. The coupling device 49 preferably has no movable coupling elements that would need to be moved to establish the coupling with the locking body 32, thus simplifying the design of the operating tool 47.

[0061] Once the locking element 32 has been moved into the release position II using the operating tool 47, the stop unit 31 can be moved along the extension direction E of the groove 23 and positioned as desired by moving the operating tool 47 approximately parallel to the extension direction E of the groove 23 relative to the disc 22. Subsequently, the force (here: tensile force) exerted via the operating tool 47 can be reduced so that, due to the preload force F, the stop unit 31 or the locking element 32 again assumes the locking position I. Fig. 3) The stop unit 31 is then, as already described, secured against unwanted relative movement to the disk 22 in the extension direction E of the groove 23. Even during a pivoting movement of the crane boom 11 against the stop unit 31, the latter retains its position on the disk 22, defined by the blocking position I, and reliably limits the pivoting range W.

[0062] In Fig. Figure 6 shows a highly schematic, modified embodiment of the limiting arrangement 14. In this embodiment, the limiting arrangement 14 is configured to indicate the swivel range W, limited by the at least one stop unit 31, on the surface 13, for example by projecting a mark M onto the surface 13. The mark M can be projected onto the surface 13, for example, by a light emission unit 53. The limiting arrangement 14 can have one or more light emission units 53.

[0063] Each light emission unit 53 can, for example, be configured to emit a light beam L and thereby generate the marking M on the surface 13. The light beam L is, in particular, aligned parallel to the pivot axis S or parallel to a vertical plane in which the crane boom 11 extends. For this purpose, the light emission unit 53 can be arranged on the crane boom 11 and / or on the lifting unit 31, as shown schematically in Fig. 6 is shown.

[0064] The light emission unit 53 can be a light emission optic connected to a light source 54. The light source 54 can, for example, be a semiconductor light source, such as a light-emitting diode or laser diode.

[0065] The light source 54 can be arranged directly adjacent to the light emission optics and thus form, so to speak, an integral part of each light emission unit 53. Alternatively, the light source 54 can also be arranged at a distance from the light emission optics or the light emission unit 53, as is exemplified in Fig. Figure 6 shows that the light emission optics of the light emission unit 53 can then be optically coupled to the light source 54, for example via an optical waveguide 55. In this case, the light emission unit 53 or the light emission optics can be formed by an end face of the optical waveguide 55. Optionally, one or more lens bodies can also be present in the light emission unit 53.

[0066] The invention relates to a limiting arrangement 14 for limiting the swivel range W of a crane boom 11. The crane boom 11 is pivotably mounted on a support 12 about a swivel axis S. The swivel axis S can be vertically oriented. The limiting arrangement 14 has a disk 22 that is fixed relative to the swivel axis S. The disk 22 has an arcuate or circular arc-shaped groove 23 that partially surrounds the swivel axis S. The groove 23 can extend completely through the disk and thus be designed as a slot. At least one stop unit 31, each with at least one stop element 44, can be arranged along the groove 23 in a desired position to limit the swivel range W of the crane boom 11 by means of the at least one stop element 44.Each stop unit 31 has a locking element 32 that can be switched between a locking position I and a release position II, in particular by a linear or other switching movement relative to the disk 22. In its locking position I, the locking element 32 prevents relative movement between the stop unit 31 and the disk 22 in the extension direction E of the groove 23. In release position II, the stop unit 31 can be moved along the extension direction E of the groove 23 and fixed in the desired position along the groove 23 by switching the locking element 32 back to locking position I. Reference symbol list: 10 crane 11 crane booms 12 supports 13 Subsurface 14 Limitation order 15 Fastening device 16 Platters 17 Plant area 18 Power generation unit 22 discs 23 Nut 24 positioning area 25 Transition area 26 marginal section 27 Edge projection 31 Stop unit 32 blocking elements 33 Blocking part 34 Release section 38 Pre-tensioning device 39 spring 40 Support part 41 Support ring 44 stop bodies 45 Connecting element 46 Connecting surface 47 Operating tool 48 Grip area 49 Coupling device 50 Magnet 53 Light emission unit 54 Light source 55 optical fibers I Blocking position II Solution position Axis b1 first groove width b2 second groove width c Block section width d Release section width E Extension direction of the groove F Preload force L light beam M marking S swivel axis W swivel range

Claims

[1] Limiting arrangement (14) for limiting a swivel range (W) of a crane boom (11) of a crane (10), wherein the crane boom (11) is pivotably mounted about a swivel axis (S) on a support (12) of the crane (10), wherein the limiting arrangement (14) comprises: - a disc (22) having an arc-shaped groove (23) extending around the pivot axis (S), - at least one stop unit (31) arranged on the disc (22), which has a locking element (32) which is movable in a release position (II) in an extension direction (E) of the groove (23) and which prevents movement in an extension direction (E) of the groove (23) in a locking position (I), wherein each stop unit (31) has at least one stop element (44) which projects into the pivoting area of ​​the crane boom (11) in the locking position (I) of the locking element (32). [2] Limiting arrangement according to claim 1, further comprising a fastening device (15) which is configured to detachably fasten the disk (22) to the support (12). [3] Limiting arrangement according to claim 1 or 2, wherein the at least one stop unit (31) can be moved between the blocking position (I) and the release position (II) by means of a switching movement. [4] Limiting arrangement according to claim 3, wherein the switching movement is aligned parallel to the pivot axis (S). [5] Limiting arrangement according to one of the preceding claims, wherein the at least one stop unit (31) has a preloading device (38) which is configured to generate a preload force (F) to force the blocking element (32) into the blocking position (I). [6] Limiting arrangement according to claim 5, wherein the blocking element (32) is movable against the preload force (F) into the release position (II). [7] Limiting arrangement according to one of the preceding claims, wherein the groove (23) has several positioning areas (24) along its extension direction, wherein two immediately adjacent positioning areas (24) are connected to each other by a transition area (25) and wherein the positioning areas (24) have a first groove width (b1) transverse to the extension direction of the groove (23) which is larger than a second groove width (b2) of the transition areas (25). [8] Limiting arrangement according to one of the preceding claims, wherein the blocking body (32) has a blocking part (33) and a release part (34), wherein the blocking part (33) has a blocking part width (c) transverse to the extension direction (E) of the groove (23) which is at most as large as the first groove width (b1) and which is larger than the second groove width (b2). [9] Limiting arrangement according to claim 8, wherein the blocking part (33) is arranged outside the groove (23) in the release position (II) and inside the groove (23) in the blocking position (I). [10] Limiting arrangement according to claim 8 or 9, wherein the release part (34) has a release part width (d) transverse to the extension direction of the groove (23) which is smaller than the second groove width (b2), wherein the release part (34) is arranged in the release position (II) inside the groove (23). [11] Limiting arrangement according to one of the preceding claims, wherein the at least one stop unit (31) in the blocking position (I) of its blocking body (32) is rotatably mounted on the disk (22) about an axis (A) of the stop unit (31), wherein the axis (A) extends obliquely or perpendicularly to the disk (22) and preferably through the groove (23). [12] Limiting arrangement according to one of the preceding claims, further comprising an operating tool (47) having at one end a grip area (48) and at its opposite end a coupling device (49) which is configured to be detachably connected to a stop unit (31) in order to move the blocking element (32) of the stop unit (31) between the blocking position (I) and the release position (II). [13] Limiting arrangement according to claim 12, wherein the coupling device (49) has a magnet (50). [14] Limiting arrangement according to one of the preceding claims, further comprising at least one light emission unit (53) which is configured to project a marking onto a surface (13) indicating a limitation of the swivel range (W) of the crane boom (11).

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