Fork-arm lift tractor

A fork-arm lift tractor comprising:

• a vehicle body capable of being disposed in a passage;
• a supporting plate disposed above the vehicle body;
• a lifting device disposed on the vehicle body and configured to drive the supporting plate to be lifted;
• a front fork-arm assembly comprising two front fork-arms disposed on the supporting plate, the two front fork-arms being respectively disposed at two sides of a longitudinal centerline of the vehicle body and rotatable on an upper surface of the supporting plate to deploy or retract from both sides of the supporting plate;
• a rear fork-arm assembly comprising two rear fork-arms disposed on the supporting plate, the two rear fork-arms being respectively disposed at two sides of the longitudinal centerline and rotatable on the upper surface of the supporting plate to deploy or retract from both sides of the supporting plate;
• a front fork-arm driving assembly comprising a front transmission part and a front power device disposed on the supporting plate, the front transmission part being connected with the two front fork-arms, the front power device being configured to drive the front transmission part to move horizontally linearly in order to bring the two front fork-arms to rotate, and a central axis of the front power device coinciding with or paralleling to the longitudinal centerline;
• and
• a rear fork-arm driving assembly comprising a rear transmission part and a rear power device disposed on the supporting plate, the rear transmission part being connected with the two rear fork-arms, the rear power device being configured to drive the rear transmission part to move horizontally linearly in order to bring the two rear fork-arms to rotate, and a central axis of the rear power device coinciding with or paralleling to the longitudinal centerline,
• wherein:
• the lifting device is disposed under the supporting plate, and
• the front fork-arm assembly, the rear fork-arm assembly, the front fork-arm driving assembly and the rear fork-arm driving assembly are all disposed over the supporting plate.