| 摘要 |
A drive beam ( 18.2 ) for a reciprocating floor includes a pair of elongate U-shaped channel members with longitudinally extending edges arranged and welded together edge to edge to define an elongate substantially rectangular in transverse cross-section tube member with opposed welded side walls ( 718 ) each with a lengthwise welding seam. A pair of elongate opposed reinforcing members ( 712 ) is fast with a respective associated welded side wall ( 718 ) and located inside the tube member.
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