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

Abstract

The invention relates to a boom-arm segment fora concrete pump, wherein the boom-arm segment ( 30 ) comprises a side part ( 35, 36 )-which extends between a top chord ( 33 ) and a bottom chord ( 34 ) of the boom-arm segment ( 30 ). In the side part ( 35, 36 ), a bent portion is formed such that a first portion ( 42, 43 ) of the side part ( 35, 36 ) has a lateral offset ( 56 ) relative to a second portion ( 44 ) of the side part ( 35, 36 ). A transition portion ( 45, 46 ) forms a connection between the first portion ( 42, 43 ) and the second portion ( 44 ). The boom-arm segment ( 30 ) comprises a reinforcement part ( 40, 50 ), the material thickness of which spans the lateral offset ( 56 ) between the first portion ( 42, 43 ) and the second portion ( 44 ). The reinforcement part ( 40, 50 ) is butt-joined to the transition portion ( 45, 46 ). The invention also relates to a method for producing a boom-arm segment ( 30 ).

1 . A boom-arm segment for a concrete pump, wherein the boom-arm segment ( 30 ) comprises a lateral part ( 35 ,  36 ) which extends between an upper chord ( 33 ) and a lower chord ( 34 ) of the boom-arm segment ( 30 ), and wherein configured in the lateral part ( 35 ,  36 ) is a bent edge so that a first portion ( 42 ,  43 ) of the lateral part ( 35 ,  36 ) has a lateral offset ( 56 ) relative to a second portion ( 44 ) of the lateral part ( 35 ,  36 ), and having a transition portion ( 45 ,  46 ) which forms a connection between the first portion ( 42 ,  43 ) and the second portion ( 44 ), wherein the boom-arm segment ( 30 ) has a reinforcement part ( 40 ,  50 ) with a material thickness bridging the lateral offset ( 56 ) between the first portion ( 42 ,  43 ) and the second portion ( 44 ), and wherein the reinforcement part ( 40 ,  50 ) and the transition portion ( 45 ,  46 ) are connected by a butt joint so that an end face of the transition portion ( 45 ,  46 ) bears on an end face of the reinforcement part ( 40 ,  50 ), and the reinforcement part ( 40 ,  50 ) adjoins the transition portion ( 45 ,  46 ) in a longitudinal direction. 
     
     
         2 . The boom-arm segment of  claim 1 , wherein the connection between the reinforcement part ( 40 ,  50 ) and the lateral part ( 35 ,  36 ) is a welded connection. 
     
     
         3 . The boom-arm segment of  claim 1 , wherein the reinforcement part ( 40 ,  50 ) and the first portion ( 42 ,  43 ) of the lateral part ( 35 ,  36 ) are connected by a butt joint. 
     
     
         4 . The boom-arm segment of  claim 1 , wherein the reinforcement part ( 40 ,  50 ) overlaps the second portion ( 44 ) of the lateral part ( 35 ,  36 ). 
     
     
         5 . The boom-arm segment of  claim 4 , wherein the reinforcement part ( 40 ,  50 ) is connected to the second portion ( 44 ) of the lateral part ( 35 ,  36 ) by a weld seam which extends along a portion of an encircling edge ( 58 ) of the reinforcement part ( 40 ,  50 ). 
     
     
         6 . The boom-arm segment of  claim 1 , wherein the first portion ( 42 ,  43 ) forms a peripheral portion of the lateral part ( 35 ,  36 ), which peripheral portion is contiguous to the upper chord ( 33 ) or the lower chord ( 34 ) of the lateral part ( 35 ,  36 ). 
     
     
         7 . The boom-arm segment of  claim 1 , wherein the second portion ( 44 ) forms a central portion of the lateral part ( 35 ,  36 ), which central portion is spaced apart from the upper chord ( 33 ) and the lower chord ( 34 ). 
     
     
         8 . The boom-arm segment of  claim 1 , wherein the first portion ( 42 ,  43 ) of the lateral part ( 35 ,  36 ) comprises an upper peripheral portion ( 42 ) and a lower peripheral portion ( 43 ), and in that the reinforcement part ( 40 ,  50 ) is welded to the upper peripheral portion ( 42 ) and to the lower peripheral portion ( 43 ). 
     
     
         9 . The boom-arm segment of  claim 1 , wherein the first portion ( 42 ,  43 ), the transition portion ( 45 ,  46 ), and the second portion ( 44 ) of the lateral part are elements of a shell component ( 41 ,  47 ) in which the shell component ( 41 ,  47 ) comprises an areal portion of the upper chord ( 33 ) or of the lower chord ( 34 ). 
     
     
         10 . The boom-arm segment of  claim 1 , wherein the boom-arm segment ( 30 ) comprises a box section with an upper chord ( 33 ), a lower chord ( 34 ), and two lateral parts ( 35 ,  36 ) disposed between the upper chord ( 33 ) and the lower chord ( 34 ), and in that the box section is assembled from half-shells ( 41 ,  47 ), wherein a first half-shell ( 41 ) comprises the upper chord ( 33 ) and in each case one upper peripheral portion ( 42 ) and in each case one upper transition portion ( 45 ) of the mutually opposite lateral parts ( 35 ,  36 ), and wherein a second half-shell ( 47 ) comprises the lower chord ( 34 ) and in each case one lower peripheral portion ( 43 ) and in each case one lower transition portion ( 46 ) of the mutually opposite lateral parts ( 36 ). 
     
     
         11 . The boom-arm segment of  claim 10 , wherein the first half-shell ( 41 ) and the second half-shell ( 47 ) are connected to one another in the central portion of the lateral part. 
     
     
         12 . The boom-arm segment of  claim 10 , wherein an end edge ( 55 ) of the second half-shell ( 47 ) is edge-bent in relation to the central portion ( 44 ) to form a buckling strength for the box section. 
     
     
         13 . The boom-arm segment of  claim 10 , comprising a fastening receptacle ( 53 ) for a holder of a conveying line ( 17 ), wherein the fastening receptacle forms a transverse connection ( 54 ) between the mutually opposite lateral parts ( 35 ,  36 ) of the boom-arm segment ( 30 ). 
     
     
         14 . The boom-arm segment of  claim 1 , comprising a first reinforcement part ( 40 ) which is configured as a joint receptacle ( 57 ), and by a second reinforcement part ( 50 ) which is designed as a receptacle ( 28 ) for a hydraulic cylinder. 
     
     
         15 . A method for producing a boom-arm segment for a concrete pump, wherein the boom-arm segment ( 30 ) comprises a lateral part ( 35 ,  36 ) which extends between an upper chord ( 33 ) and a lower chord ( 34 ) of the boom-arm segment ( 30 ), said method comprising:
 configuring in the lateral part ( 35 ,  36 ) to include a bent edge so that a first portion ( 42 ,  43 ) of the lateral part ( 35 ,  36 ) has a lateral offset ( 56 ) relative to a second portion ( 44 ) of the lateral part ( 35 ,  36 ), and a transition portion ( 45 ,  46 ) which forms a connection between the first portion ( 42 ,  43 ) and the second portion ( 44 );   selecting a material thickness of a reinforcement part ( 40 ,  50 ) to bridge the lateral offset ( 56 ) between the first portion ( 42 ,  43 ) and the second portion ( 44 ); and   connecting the reinforcement part ( 40 ,  50 ) to the transition portion ( 45 ,  46 ) by way of a butt joint so that an end face of the transition portion ( 45 ,  46 ) bears on an end face of the reinforcement part ( 40 ,  50 ), and the reinforcement part ( 40 ,  50 ) adjoins the transition portion ( 45 ,  46 ) in a longitudinal direction.