Semitrailer pull formula boundary beam structure

The utility model provides a semitrailer pull formula boundary beam structure relates to semitrailer equipment technical field, includes: girder, fixed pipe, outer slide, interior draw runner, boundary beam, cylinder. The utility model has the advantages of the cylinder can be effectual the position of adjustment boundary beam, the size that can let the boundary beam according to the goods is suitably adjusted to can let the goods is stable puts the position that bears the weight of at the vehicle. The both ends of cylinder respectively with girder, boundary beam swing joint, this makes the instantaneous impact that produces when the adjustment cylinder to be subductd by this kind of two swing joint's structure, vibration when having reduced the adjustment. Outer slide is mutually supported with interior draw runner, can make the boundary beam can be retrained in the adjustment procedure, the unbalanced phenomenon of boundary beam displacement just so can not appear and take place. Distance sensor cooperation safety control module can effectively prevent the cylinder paratonia, just can stop the cylinder through the power control end of cylinder before the cylinder extends dangerous length to play the effect of safety precaution.