Its main purpose of cross-shaped joint unit is releasing the stress formed between system assembly and the irregular surface plane under sea when harrow suction pipes system in working,effective prevent harrow suction pipes assembly from damage.This unit is solid steel structure,and it is convenient to assemble in all harrow suction pipes assembly.
　　Cross-shaped joint realized cross hub connection form between horizontal plane and vertical plane, the structure has enough strength to accept sucking pipe loaded with working and big effective compensation angle,maximum compensation angle 30 degrees.。