WO2023016868A1 - Mastarm-segment für eine betonpumpe und verfahren zum herstellen eines mastarm-segments - Google Patents
Mastarm-segment für eine betonpumpe und verfahren zum herstellen eines mastarm-segments Download PDFInfo
- Publication number
- WO2023016868A1 WO2023016868A1 PCT/EP2022/071713 EP2022071713W WO2023016868A1 WO 2023016868 A1 WO2023016868 A1 WO 2023016868A1 EP 2022071713 W EP2022071713 W EP 2022071713W WO 2023016868 A1 WO2023016868 A1 WO 2023016868A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- arm segment
- mast arm
- chord
- connection
- side part
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000007688 edging Methods 0.000 claims 1
- 230000007704 transition Effects 0.000 description 12
- 239000007788 liquid Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
- E04G21/0418—Devices for both conveying and distributing with distribution hose
- E04G21/0445—Devices for both conveying and distributing with distribution hose with booms
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
- E04G21/0418—Devices for both conveying and distributing with distribution hose
- E04G21/0436—Devices for both conveying and distributing with distribution hose on a mobile support, e.g. truck
Definitions
- the invention relates to a boom arm segment for a concrete pump and a method for producing a boom arm segment.
- a concrete pump mast arm is usually composed of a plurality of mast arm segments, with the sum of the mast arm segments making up the length of the mast arm in an unfolded state, and with the mast arm segments being folded together in a compact state in a folded state in order to to facilitate transportation.
- Concrete pumps normally convey the liquid concrete in spurts, so that the boom arms are exposed to considerable dynamic loads.
- the boom arm segments can be folded differently when the concrete pump is in operation, depending on the distance at which the liquid concrete is to be discharged from the concrete pump.
- the tensile and compressive loads on a mast arm segment act in very different directions, depending on the operating state of the mast arm. For these reasons, boom arm segments of a concrete pump are exposed to special loads during operation.
- the mast arm segment according to the invention comprises an upper chord, a lower chord and two side parts connecting the upper chord and the lower chord.
- the side parts each comprise a lower edge section adjacent to the bottom chord and a central section arranged between the lower edge section and the upper chord, the distance between the central section of the first side part and the central section of the second side part being greater than the distance between the lower edge section of the first Side part and the lower edge portion of the second side part.
- the mast arm segment includes an articulation joint having an articulation surface defining a pivot axis for pivotal connection between the mast arm segment and an adjacent structure.
- the articulation surface is at least partially arranged below the lower chord.
- the hinge joint is connected to the central portion of the first side panel via a first connection beam, the first connection beam extending across the lower edge portion of the first side panel without being connected to the lower edge portion of the first side panel.
- the invention has recognized that the first connection carrier creates a particularly favorable possibility of introducing the forces acting in the area of the articulated connection into the mast arm segment.
- the first connection support is routed over the edge section of the first side part without being connected to the edge section of the first side part.
- the central section of the first side part can extend in a plane which includes a right angle with a pivot axis defined by the articulation connection.
- a longitudinal median plane is a plane parallel to it that steering connection cuts in the middle .
- the central section of the first side part can have the same distance from the longitudinal center plane as the central section of the second side part.
- the lower edge section of the first side part can have the same distance from the longitudinal center plane as the lower edge section of the second side part.
- the distance between the lower edge section and the longitudinal center plane can be smaller than the distance between the central section and the longitudinal center plane.
- the first connecting beam may extend in a plane parallel to the longitudinal median plane, the distance between the first connecting beam and the longitudinal median plane may be greater than the distance between the outside of the central portion and the longitudinal median plane.
- the inside of the first connecting beam lies in the same plane as the outside of the central section, the first connecting beam may lie on the outside of the central section.
- a first section of the first connection carrier can form a doubling with the central section of the first side part.
- a second portion of the first connection beam can protrude from the central portion of the first side part in the direction of the hinge connection.
- the mast arm segment can be designed in such a way that the second section of the first connection carrier has no further connections to components of the mast arm segment apart from the connections to the first section of the first connection carrier and to the joint connection.
- the first connection bracket may be connected to the central portion of the first side member by welding.
- a weld seam may be formed which extends along a circumferential line formed by the first connecting beam resting on the central portion of the first side part. never extends .
- the weld seam extends without interruption over the entire length of the perimeter.
- the first connection carrier can be composed of a first component and a second component.
- the first component can be designed in such a way that it rests on the central section of the first side part over its entire circumference. The entire circumference of the first component is then easily accessible for a welding machine.
- the second component of the first connection beam can be welded to the first component.
- the weld seam between the first component and the second component may extend along a bottom edge of the central portion of the first side piece.
- the first connection carrier can be connected to the central section of the first side part by a welded joint arranged in the surface of the first connection carrier.
- the first connection carrier can have an opening in which the welded connection is set.
- the opening can be filled with material by the welding process.
- the opening can have a first section which extends in the longitudinal direction of the mast arm segment.
- the opening can have a second section which is connected to the first th section includes an angle. The angle can be between 60° and 80°.
- the opening can be arranged adjacent to the proximal end of the first connection carrier.
- the first connection beam may include an end portion terminating within the central portion of the first side member.
- the end area can form a distal end of the first connection carrier.
- the end area can taper off towards a tip of the end area.
- the outermost point of the end area is referred to as the tip, regardless of whether the end area tapers to a point there or has a different shape, for example rounded off.
- the tip of the end portion may have a position spaced from the top and bottom edges of the central portion.
- the tip of the end area can be arranged close to the neutral axis of the mast arm segment, which means that the distance between the tip of the end area and the nearest belt is at least 2 times, preferably 3 times, more preferably 5 times is greater than the distance between the tip and the neutral axis.
- the end area can be connected to the central section of the first side part by a circumferential welded connection.
- the weld seam can extend beyond the end of the end area into the side part.
- a further measure to avoid stress peaks can be to process the connection carrier, for example by milling, in such a way that the material thickness of the connection carrier is reduced towards the tip of the end area. It is also possible, for the purpose of weight reduction, to produce a reduced material thickness in those areas in which the connection carrier is under less stress.
- the central section of the first side part can extend up to the upper belt.
- an upper edge section can be formed between the central section of the first side part and the upper chord, which has a lateral offset relative to the central section.
- a transition section can be formed between the central section and the upper edge section.
- the distance between the upper edge section and the longitudinal center plane can be smaller than the distance between the central section and the longitudinal center plane.
- the lateral offset between the central section and the upper edge section can be created by folding the side part several times.
- the side part can be bent in one direction between the central section and the transition section.
- the side part can be bent in the opposite direction between the transition section and the upper edge section.
- the bending angle of the two edges can be chosen such that the central portion of the side part lies in a plane which is parallel to the upper edge portion.
- the transition section can extend in a plane which intersects the plane of the first side part at an angle of between 10° and 80°, preferably at an angle of between 15° and 30°. If the side part has an upper edge section and a lower edge section, the transition between the central section and the upper edge section and the transition between the central section and the lower edge section can be formed by two such edge combinations.
- the mast arm may comprise a second connection beam, wherein the articulation joint is connected to the central portion of the second side part via the second connection beam.
- the second connecting beam can extend beyond the lower edge portion of the second side part without having to to be connected to the lower edge portion of the second side part.
- the second connection carrier can have the same features that are described in connection with the first connection carrier.
- the second side part can have the same features that are described in connection with the first side part.
- the top chord, bottom chord and side parts of the mast arm segment can form a box section.
- the box profile can be composed of shell components that are connected to one another by weld seams running in the longitudinal direction of the mast arm segment.
- a weld seam between a first shell component and a second shell component may extend along an edge of the central portion of the first side panel.
- the weld may further coincide with a weld between the first connection beam and the central portion of the first side panel.
- the box profile is composed of two half-shells, with a first half-shell encompassing the upper chord and in each case an upper partial section of the opposite side parts.
- a second half-shell can include the lower chord as well as a respective lower partial section of the opposite side parts.
- the two half-shells can be welded to form a box profile by means of two longitudinal weld seams.
- the articulated connection can be designed in such a way that external forces acting on the articulated connection are introduced exclusively via the two connecting supports into the box profile of the mast arm segment formed from the straps and the side parts.
- the mast arm segment can be designed so that the Apart from the connection via the connection beams, the articulated connection has no connection to the lower chord and the side parts of the mast arm segment.
- the hinge connection can be spaced from the lower chord. There may be a clearance between the articulation connector and the bottom chord. Towards the sides, the free space can be limited by the first connection carrier and the second connection carrier.
- the information above and below refer to the condition of the mast arm segment shown in the drawings.
- the plane of the bottom chord is defined by the longitudinal direction and the transverse direction of the bottom chord.
- the specification relates to the section of the lower chord adjacent to the joint connection.
- the directions given are based on the assumption that the plane of the bottom chord is oriented horizontally. This does not mean any restriction with regard to the subsequent assembly position of the mast arm segment; in particular, assembly positions that are rotated by 90° or by 180° compared to the state shown in the figures are possible.
- the lower chord can extend along a straight line in the direction of an opposite end of the mast arm segment (longitudinal direction).
- the end of the mast arm segment adjacent to the joint connection can be the proximal end.
- the plane of the bottom chord is defined by the longitudinal direction of the bottom chord and the dimension parallel to the pivot axis of the hinge joint. If the bottom chord does not extend over the entire length of the mast arm in one plane, the plane of the bottom chord is defined by a section of the bottom chord that is adjacent to the joint connection.
- the articulation connection can be arranged below the level of the lower chord. It is possible that the bottom chord also extends transversely in the plane of the bottom chord.
- the lower chord has a shape extending out of the plane of the lower chord in the transverse direction.
- the lower chord can have one or more bends or be provided with one or more bevels.
- the direction of the edges/bends can be parallel to the longitudinal direction of the mast arm segment, resulting in an out-of-plane shape in the transverse direction.
- the lower chord can have a shape that is arched in the transverse direction, for example by the lower chord being folded in such a way that the sum of the folded edges corresponds to a curvature.
- the bulge may be oriented such that the distance between the pivot axis of the hinge joint and a central area of the bottom chord is less than the distance between the pivot axis and a peripheral area of the bottom chord.
- the plane of the bottom chord is defined by the area of the bottom chord that is closest to the hinge joint.
- the mast arm segment is designed to be pivotally connected to an adjacent structure via a pivot joint.
- the adjacent structure may be another segment of the boom arm or a base frame of the concrete pump.
- the swivel joint is formed by a first joint connection which is a member of the mast arm segment and a second joint connection which is a member of the adjacent structure separate from the mast arm segment.
- the position of the swivel axis is determined by the articulated connection of the mast arm segments defined .
- the articulated connection can comprise an articulated bore, the axis of the articulated bore corresponding to the pivot axis.
- the articulation port may include structure within which the articulation bore is formed.
- the joint connection can be a piece of pipe, within which the joint bore extends.
- the articulated connection can form a receptacle for an articulated bolt.
- the receptacle for the joint bolt corresponds to the joint surface that defines the pivot axis.
- the articulation surface of the articulated connection that defines the pivot axis is arranged at least partially below the lower chord, the possibility is included that the plane of the lower chord intersects the articulated connection.
- the articulating surface may include an area that coincides with the plane of the inferior chord or is above the plane of the inferior chord. This design can be associated with the fact that the lower chord ends at a distance from the articulated connection, ie the articulated connection is arranged in an extension of the lower chord.
- the mast arm segment is designed in such a way that the pivot axis defined by the joint surface is arranged below the lower chord. It is also advantageous if the joint surface defining the pivot axis is arranged in its entirety below the lower chord. More preferably, the distance between the pivot axis of the articulated connection and the plane of the lower chord can be large enough that the plane of the lower chord does not intersect the structure of the articulated connection.
- the joint connection can form a proximal joint mount of the mast arm segment.
- the connection carrier can be formed a receptacle for an articulated lever to which a Hydraulic cylinder can be connected.
- the hydraulic cylinder has the function of pivoting the mast arm segment relative to an adjacent structure, in particular relative to an adjacent mast arm segment.
- the articulated lever can be connected to the connecting bracket via a pivot connection.
- the mast arm segment can include a mounting seat for a holder of a conveyor line.
- the attachment receptacle can extend in the transverse direction through the mast arm segment and form a transverse connection between the opposite side parts of the mast arm segment.
- the attachment mount can be welded to each of the side parts.
- the attachment receptacle may extend between the central portions of the opposite side members. In this way, the attachment receptacle can offer additional protection against the side parts of the mast arm segment deviating to the side under load. Due to the connection with the side parts, the forces exerted by the fastened elements can be introduced well into the side parts.
- the fastening receptacle can protrude in relation to the side part.
- the mounting receptacle can be designed in such a way that a holder for the delivery line can be connected.
- blind holes can be provided for a screw connection.
- the holder it is also possible for the holder to be welded to the fastening receptacle, for example.
- the mast arm segment comprises a holder, connected to the fastening receptacle, for a delivery line and/or a delivery line connected to the fastening receptacle.
- hydraulic lines be connected to the mast arm segment via which, for example, hydraulic devices for folding and folding the mast arm can be operated.
- the mast arm segment can comprise a plurality of such mounting mounts, in particular at least two mounting mounts, preferably at least three mounting mounts, more preferably at least four mounting mounts.
- the attachment mounts can be substantially evenly distributed over the length of the mast arm segment.
- One or more of the mounting brackets may be connected to a connecting bracket.
- the delivery line can extend over the length of the boom arm segment.
- the conveyor line can comprise a joint part at one or both of its ends, which is designed to form a pivotable connection to a conveyor line of an adjacent boom arm segment.
- the pivot axis defined by the joint part can be coaxial with the pivot axis of the joint connection and thus coaxial with the axis of the mast arm swivel joint.
- the conveyor line can be arranged to the side of the boom arm segment.
- the invention also relates to a concrete pump boom arm with a plurality of boom arm segments, wherein at least one of the boom arm segments is designed according to the invention.
- a Pivot joint formed between each two adjacent mast arm segments.
- the axis of the swivel joint may be oriented so that it extends through the planes of the two side parts of the mast arm segment, the two planes preferably being intersected at right angles or at an angle with this direction of less than 10°, preferably less than 5° lock in .
- the belt surfaces can extend parallel to the pivot axis.
- the articulation may include a first articulated lever pivotally attached to a first mast arm segment.
- the joint may include a second link lever pivotally attached to the second mast arm segment and which is also pivotally attached to the first link lever.
- a hydraulic cylinder can extend from the first mast arm segment to the first articulated lever, so that a lifting movement of the hydraulic cylinder is translated into a pivoting movement between the mast arm segments. Seen from the first mast arm segment, the hydraulic cylinder is preferably attached to the first articulated lever on the side of the second articulated lever.
- the concrete pump boom arm can include a conveying line for a thick substance, in particular fresh concrete, which extends along the boom arm.
- a segment of the conveyor line can be assigned to each segment of the boom arm. Adjacent segments of the conveying line can be connected to one another via a joint, the joint axis preferably being coaxial to the joint with which the associated boom arm segments are connected to one another.
- the individual segment of the conveyor line can be designed as a rigid pipeline.
- the invention also relates to a method for manufacturing such a mast arm segment, in which a first component of the first connecting beam is welded to the central section of the first side part and in which a second component of the first connection carrier is welded to the first component.
- the method can be developed with further features that are described in connection with the mast arm segment according to the invention.
- the mast arm segment can be developed with additional features that are described in connection with the method according to the invention.
- FIG. 2 the concrete pump vehicle from FIG. 1 with the boom arm folded out;
- FIG. 5 shows the distal end of the mast arm segment from FIG. 3 in an enlarged representation
- FIG. 8 the proximal end from FIG. 7 in a different perspective.
- FIG. 9 a cross section through the mast arm segment from FIG. 3;
- FIG. 10 a detail of the mast arm segment from FIG. 3 in an enlarged representation
- FIG. 11 a cross section through the mast arm segment from FIG. 7;
- FIG. 12 a detail of the mast arm segment from FIG. 11 in an enlarged representation.
- a truck 14 shown in FIG. 1 is equipped with a concrete pump 15 which conveys liquid concrete from a hopper 16 through a delivery line 17 .
- the conveying line 17 extends along a mast arm 18 which is rotatably mounted on a slewing ring 19 .
- the mast arm 18 comprises three mast arm segments 20, 21, 22 which are articulated to one another. By pivoting the mast arm segments 20, 21, 22 relative to one another via the joints, the mast arm 18 can switch between a folded-in state (FIG. 1) and an unfolded state (FIG. 2).
- the delivery line 17 extends beyond the distal end of the third boom arm segment 22 so that the liquid concrete can be discharged in an area remote from the concrete pump 15 .
- the loads act on the mast arm segments 20, 21, 22 in very different directions.
- the boom arm is exposed to high dynamic loads due to the intermittent conveyance of the liquid concrete.
- the swivel joints between the mast arm segments 20, 21, 22 are designed in such a way that they allow a large swivel angle.
- the mast arm segments 20, 21, 22 are essentially parallel to one another and enclose a small angle between them.
- the mast arm segments 20, 21, 22 extend approximately in line with one another.
- the hinge construction is shown in Fig. 4 using the example of the swivel joint between the first mast arm segment 20 and the second mast arm segment 21.
- the pivot axis 74 is formed by a joint bolt 23, through which a proximal end of the second mast arm segment 21 is connected to a distal end of the first mast arm segment 20.
- a first articulated lever 24 is attached to the first mast arm segment 20 adjacent to the articulated bolt 23 .
- a second articulated lever 25 is attached to the second mast arm segment 21 adjacent to the articulated bolt zen 23 .
- the two articulated levers are articulated to one another at 26 .
- a hydraulic cylinder 27 extends from a receptacle 28 on the first mast arm segment 20 to the outer end of the first articulated lever 24 . A lifting movement of the hydraulic cylinder 27 is translated into a pivoting movement between the mast arm segments 20 , 21 via the articulated levers 24 , 25 .
- the mast arm segment 30 according to the invention shown in FIG. 3 extends from a proximal end 31 to a distal end 32 .
- the mast arm segment 30 is designed as a box-shaped profile with an upper chord 33 , a lower chord 34 and two side parts 35 , 36 .
- the box-shaped profile of the mast arm segment tapers continuously from the proximal end 31 to the receptacle 28 for the hydraulic cylinder.
- the two side parts 35 , 36 as well as the upper chord 33 and the lower chord 34 thus each approach one another with an increasing distance from the proximal end 31 .
- the mast arm segment 30 is provided with a first connecting bracket 40 and a second connecting bracket 57 providing a connection between the box and profile and a proximal joint receptacle 37 of the mast arm segment 30 form.
- the box-shaped profile extends from the proximal end 31 in the direction of the distal end 32 .
- the box-shaped profile is made up of an upper half-shell 41 and a lower half-shell 47, each of which is designed as folded sheet metal.
- the two side parts 35 , 36 each comprise a central section 42 which extends to the upper chord 33 and a lower edge section 43 which adjoins the lower chord 34 .
- the side parts 35 , 36 are bent outwards so that the distance 59 between the central sections 44 of the two side parts 35 , 36 is greater than the distance 58 between the lower edge sections 43 of the side parts 35 , 36 .
- the central sections 44 are at a greater distance from a longitudinal center plane 64 of the mast arm segment than the lower edge section 43 .
- a transition section 45 is formed between the central section 44 and the lower edge section 43, which forms an angle of approximately 30° with the plane of the lower edge section 43 or the parallel plane of the central portion 44 includes.
- the upper half-shell 41 comprises the upper chord 33 and the side parts 35 , 36 up to the lower end of the central sections 44 .
- the lower half-shell 47 comprises the lower chord 34, the lower edge sections 43, the lower transition sections 45 and an overlapping strip 48 which overlaps with the lower end of the central sections 44, see FIG. 10 .
- a weld seam 49 is formed at the lower end of the upper half-shell 47 and connects the two half-shells 41 , 47 to one another.
- the two connecting beams 40, 57 have a greater material thickness than the box profile made up of the half-shells 41, 47, see fig. 10 .
- the inside of the connecting brackets 40 , 57 rests on the central portions 44 of the side parts 35 , 36 .
- the connection between the connecting beams 40 , 57 and the central sections 44 is formed by a circumferential weld seam which extends along the circumferential line along which the connecting beam rests on the central section 44 . Starting from the outside of the central sections 44 , the connecting beams 40 , 57 protrude freely downwards and enclose a clearance 65 between them and the lower edge section 43 .
- the articulated connection 37 is in the form of a piece of pipe, inside which there is a articulated bore for receiving a articulated bolt.
- the inner surface of the tube piece forms an articulation surface 12 with which the pivot axis 74 is defined, see FIG. 6 .
- the pipe section and thus also the joint surface 12 are arranged with their entire cross-section below the plane 63 of the lower chord 34 so that there is no direct connection between the lower chord 34 and the joint connection 62 .
- the pivot joint 37 has no further connection to the box section of the mast arm segment other than the connection formed by the connecting brackets 40,57.
- There is a free space 65 between the articulated connection 37 and the lower chord 34 which is delimited on the sides by the connecting supports 40 , 57 .
- the hinge bore accommodates the joint bolt zen 23 which connects the mast arm segment 30 to an adjacent mast arm segment.
- the articulated lever 25 can be connected next to the articulated hole 37 .
- the mast arm segment 30 comprises a further joint connection 50 near its distal end and a further stud bolt 66 to which a joint lever 24 can be connected.
- a receptacle 28 is arranged on which a hydraulic cylinder can be connected to operate an adjacent mast arm segment.
- the mast arm segment comprises a plurality of fastening receptacles 53 for attaching holders (not shown) for the conveying line 17.
- a first fastening receptacle 53 is connected to the first connecting carrier 40.
- two further mounting receptacles 53 are arranged.
- a fourth mounting receptacle 53 is located near distal end 32 .
- the articulation surface 12 defining the pivot axis 74 is disposed on the outside of a bolt which extends through the connecting brackets 40,57.
- the two side parts 35, 36 each comprise an upper edge section 42, which adjoins the upper chord 33, and a lower edge section 43, which adjoins the lower chord 34.
- the upper edge sections 42 and the lower edge sections 43 of a side part lie in the same plane.
- a central section 44 is arranged between the edge sections 42, 43 and has a lateral offset relative to the edge sections 42, 43.
- the side parts 35, 36 are bent outward starting from edge sections 42, 43, so that the central sections 44 of the two side parts 35, 36 have a greater distance from one another than the edge sections 42, 43 of the side parts 35, 36.
- Between the central section 44 and the Edge sections 42, 43 are formed as transition sections 45, 46, each of which encloses an angle of approximately 30° with the plane of the edge sections 42, 43 or the plane of the central sections 44 parallel thereto.
- the bottom chord 34 is formed by a metal sheet which is flat in the longitudinal direction and which has an outwardly curved shape in the transverse direction due to a number of folds 60 .
- the upper chord 33 has an outwardly curved shape that is generated by a plurality of folds 60 .
- a schematic representation of the cross section of the box section is shown in FIG. 11 shown. The distance between the central sections 44 of the side parts 35,36 is greater than the distance 58 between the lower edge sections 43 of the side parts 35,36.
- an upper half-shell 41 of the box profile which comprises the upper chord 33 , the two upper edge sections 42 and the two central sections 44 .
- the lower end of the upper half-shell 41 corresponds to the lower end of the central portions 44 .
- a lower half-shell 47 of the box profile comprises the bottom flange 34 , the lower edge sections 43 , the transition sections 45 and two overlapping strips 48 adjoining the transition section 45 .
- the half-shells 41 , 47 are joined together so that the overlapping strips 48 rest on the inside of the central sections 44 and overlap with the lower end of the central sections 44 .
- a weld seam is made at the lower end of the central sections 44, which extends over the length of the half-shells 41, 47 and connects the half-shells 41, 47 to one another, see FIG. 12 .
- Attachment of the connection supports 40 , 57 takes place in a two-stage process.
- a first component 51 is placed from the outside as a doubling on the central section 44 of one of the side parts 35 , 36 .
- the first component 51 which is a metal sheet with a greater material thickness, is dimensioned such that the entire perimeter of the first component 51 lies within the area of the central section 44 .
- the first component 51 is connected with a circumferential weld seam, which extends without interruption over the entire circumference of the first component 51, with the center ral section 44 connected.
- the lower edge of the first component 51 lies close to the lower end of the central section 44, so that the weld seam 55 in this area essentially coincides with the lower end of the central section 44, see FIG. 12 .
- a connection between the first component 51 and a second component 52 is produced with the weld seam 55 on the lower edge of the first component 51 .
- the second component 52 does not lie on the central section 44 but extends freely downwards starting from the weld seam 55 .
- the second component 52 is connected to the articulated connection 37 .
- the second component 52 has no connection to the transition section 45 or the lower edge section 43 .
- the joint connector 37 has no connection to the box section other than the connection made via the connecting brackets 40,57.
- the connecting carriers 40, 57 are also each composed of a first component 51 and a second component 52.
- a second weld joint 56 is formed between the first component 51 and the central section 44 , which is arranged within an opening in the first component 51 .
- the aperture has a first portion that extends substantially parallel to the bottom edge of the central portion 44 and a second portion that extends substantially parallel to the proximal terminal edge of the mast arm segment.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
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- Jib Cranes (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22760922.9A EP4384675A1 (de) | 2021-08-09 | 2022-08-02 | Mastarm-segment für eine betonpumpe und verfahren zum herstellen eines mastarm-segments |
CN202280055638.8A CN117795169A (zh) | 2021-08-09 | 2022-08-02 | 用于混凝土泵的可伸缩杆段和用于生产可伸缩杆段的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021120617.0A DE102021120617A1 (de) | 2021-08-09 | 2021-08-09 | Mastarm-Segment für eine Betonpumpe und Verfahren zum Herstellen eines Mastarm-Segments |
DE102021120617.0 | 2021-08-09 |
Publications (1)
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WO2023016868A1 true WO2023016868A1 (de) | 2023-02-16 |
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PCT/EP2022/071713 WO2023016868A1 (de) | 2021-08-09 | 2022-08-02 | Mastarm-segment für eine betonpumpe und verfahren zum herstellen eines mastarm-segments |
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EP (1) | EP4384675A1 (de) |
CN (1) | CN117795169A (de) |
DE (1) | DE102021120617A1 (de) |
WO (1) | WO2023016868A1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3947191A (en) * | 1974-06-25 | 1976-03-30 | Milner Jr Edwin Earl | Lightweight high strength boom construction |
JPH11158908A (ja) * | 1997-12-02 | 1999-06-15 | Kubota Corp | 作業機のブーム構造及びブーム部材の製造方法 |
US10450717B1 (en) * | 2019-04-12 | 2019-10-22 | Deere & Company | Attachment assembly for a work vehicle with reinforcement members |
DE102020206109A1 (de) * | 2019-05-21 | 2020-11-26 | Deere & Company | Bausatz für eine arbeitsmaschine und verfahren zur montage einer knoten- und strebenstruktur |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3958377A (en) | 1974-06-25 | 1976-05-25 | Milner Jr Edwin Earl | Lightweight high strength boom construction |
DE19549268C1 (de) | 1995-12-28 | 1997-07-31 | Mannesmann Ag | Träger in Kastenbauweise, insbesondere Kranausleger bzw. Teleskopausleger und Verfahren zum Herstellen eines Trägers |
CN201330507Y (zh) | 2008-12-25 | 2009-10-21 | 三一重工股份有限公司 | 一种混凝土泵送设备用臂节及臂架 |
-
2021
- 2021-08-09 DE DE102021120617.0A patent/DE102021120617A1/de active Pending
-
2022
- 2022-08-02 WO PCT/EP2022/071713 patent/WO2023016868A1/de active Application Filing
- 2022-08-02 EP EP22760922.9A patent/EP4384675A1/de active Pending
- 2022-08-02 CN CN202280055638.8A patent/CN117795169A/zh active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3947191A (en) * | 1974-06-25 | 1976-03-30 | Milner Jr Edwin Earl | Lightweight high strength boom construction |
JPH11158908A (ja) * | 1997-12-02 | 1999-06-15 | Kubota Corp | 作業機のブーム構造及びブーム部材の製造方法 |
US10450717B1 (en) * | 2019-04-12 | 2019-10-22 | Deere & Company | Attachment assembly for a work vehicle with reinforcement members |
DE102020206109A1 (de) * | 2019-05-21 | 2020-11-26 | Deere & Company | Bausatz für eine arbeitsmaschine und verfahren zur montage einer knoten- und strebenstruktur |
Also Published As
Publication number | Publication date |
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EP4384675A1 (de) | 2024-06-19 |
DE102021120617A1 (de) | 2023-02-09 |
CN117795169A (zh) | 2024-03-29 |
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