Boom-arm segment for a concrete pump and method for producing a boom-arm segment

Abstract

A boom-arm segment for a concrete pump, having an upper chord (33), a lower chord (34) and two side parts (35, 36) connecting the upper chord (33) and the lower chord (34), the side parts (35, 36) each comprising a lower edge portion (43) adjacent to the lower chord (34) and a central portion (44) arranged between the lower edge portion (43) and the upper chord (33). The central portions (44) are at a greater distance from one another than the lower edge portions (43). The boom-arm segment (30) comprises an articulation connection (37) with an articulation surface (12) which defines a pivot axis (74) for a pivot connection between the boom-arm segment (21) and an adjacent structure (20), the articulation surface (12) being at least partially arranged below the plane (63) of the lower chord (34). The articulation connection (37) is connected to the central portion (44) of the first side part (35) via a first connecting support (40), the first connecting support (40) extending beyond the lower edge portion (43) of the first side part (35) without being connected to the lower edge portion (43) of the first side part (35). The invention further relates to a method for producing a boom-arm segment of this type.

1 . A boom arm segment for a concrete pump, having an upper flange ( 33 ), a lower flange ( 34 ) and two side parts ( 35 ,  36 ) connecting the upper flange ( 33 ) and the lower flange ( 34 ), wherein the side parts ( 35 ,  36 ) each comprise a lower edge portion ( 43 ) adjacent to the lower flange ( 34 ) and a central portion ( 44 ) arranged between the lower edge portion ( 43 ) and the upper flange ( 33 ), wherein the side parts ( 35 ,  36 ) are beveled outward starting from the lower edge portion ( 43 ), such that the distance ( 59 ) between the central portion ( 44 ) of the first side part ( 35 ) and the central portion ( 44 ) of the second side part ( 36 ) is greater than the distance ( 58 ) between the lower edge portion ( 43 ) of the first side part ( 35 ) and the lower edge portion ( 43 ) of the second side part, wherein the boom arm segment ( 30 ) comprises a joint connection ( 37 ) with a joint surface ( 12 ), which defines a pivot axis ( 74 ) for a pivot connection between the boom arm segment ( 21 ) and an adjacent structure ( 20 ), wherein the joint surface ( 12 ) is at least partially arranged below the plane ( 63 ) of the lower flange ( 34 ), wherein the joint connection ( 37 ) is connected via a first connecting carrier ( 40 ) to the central portion ( 44 ) of the first side part ( 35 ), wherein the first connecting carrier ( 40 ) extends beyond the lower edge portion ( 43 ) of the first side part ( 35 ) without being connected to the lower edge portion ( 43 ) of the first side part ( 35 ). 
     
     
         2 . The boom arm segment of  claim 1 , wherein the pivot axis ( 74 ) is arranged below the plane ( 63 ) of the lower flange ( 34 ), preferably in that the joint surface ( 12 ) is arranged in its entirety below the lower flange ( 34 ). 
     
     
         3 . The boom arm segment of  claim 1 , wherein the first connecting carrier ( 40 ) extends in a plane parallel to a longitudinal center plane ( 64 ) of the boom arm segment. 
     
     
         4 . The boom arm segment of  claim 1 , wherein the first connecting carrier ( 40 ) rests on an outer side of the central portion ( 44 ). 
     
     
         5 . The boom arm segment of  claim 1 , wherein the first connecting carrier ( 40 ) is composed of a first component ( 51 ) and a second component ( 52 ). 
     
     
         6 . The boom arm segment  claim 5 , wherein the first component ( 51 ) has a circumference and the entire circumference rests on the central portion ( 44 ) of the first side part ( 35 ). 
     
     
         7 . The boom arm segment of  claim 5 , wherein the second component ( 52 ) is connected to the first component ( 51 ) by a weld ( 55 ) which extends along a lower edge of the central portion ( 44 ) of the first side part ( 35 ). 
     
     
         8 . The boom arm segment of  claim 1 , comprising a second connecting carrier ( 57 ), wherein the joint connection ( 37 ) is connected via the second connecting carrier ( 57 ) to the central portion ( 44 ) of the second side part ( 36 ). 
     
     
         9 . The boom arm segment of  claim 1 , wherein the boom arm segment ( 30 ) comprises a box profile and in that the box profile is composed of a first half shell ( 41 ) and a second half shell ( 47 ). 
     
     
         10 . The boom arm segment of  claim 9 , wherein the first half shell ( 41 ) comprises the upper flange ( 33 ), an upper edge portion ( 42 ) and a central portion ( 44 ) of the opposite side parts ( 35 ,  36 ), respectively. 
     
     
         11 . The boom arm segment of  claim 9 , wherein the second half shell ( 47 ) comprises the lower flange ( 34 ), a lower edge portion ( 43 ) and an overlap strip ( 48 ) of the opposite side parts ( 35 ,  36 ) respectively. 
     
     
         12 . The boom arm segment of  claim 11 , wherein the first half shell ( 41 ) and the second half shell ( 47 ) are connected to each other along a lower edge of the central portion ( 44 ). 
     
     
         13 . The boom arm segment of  claim 8 , wherein between the joint connection ( 37 ) and the lower flange ( 34 ) a clearance ( 65 ) is formed, which is delimited by the first connecting carrier ( 40 ) and the second connecting carrier ( 57 ). 
     
     
         14 . The boom arm segment of  claim 1 , wherein the upper flange ( 33 ) and/or the lower flange ( 34 ) are/is provided with bent portions oriented in the longitudinal direction. 
     
     
         15 . A method for producing a boom arm segment of  claim 1 , wherein a first component ( 51 ) of the first connecting carrier ( 40 ) is welded to the central portion ( 44 ) of the first side part ( 35 ), and in that a second component ( 52 ) of the first connecting carrier ( 40 ) is welded to the first component ( 51 ).