Truck loading is the last step before goods leave the factory, long relying on manual labour and forklifts: the trailer is cramped, dusty and filled with exhaust, and output fluctuates with the crew. Automated loading hands the task to machines, and gantry robots, with wide coverage, rigid frames and multi-axis motion, are the workhorse for bags, cartons and pallets.

The first challenge in automated loading is locating the trailer. Every truck stops slightly differently, and trailer length, width and floor height vary by model. Laser ranging or vision devices at the bay measure the boundary, the data is converted into the robot coordinate system, and the controller offsets every pick point dynamically, so no re-teaching is needed per vehicle.

A telescopic belt conveyor working with a gantry robot is the usual arrangement. The belt feeds goods into the trailer while the robot grips and stacks: rear first, row by row, layered across the trailer width so the load stays even and centred. For unpalletised bags, a preset stacking pattern is followed layer by layer to prevent collapse or slipping in transit.

Loading cycle time must be calculated per vehicle type. Parts per trailer times cycle time per part gives the working time, plus auxiliary time for positioning, pattern changes and vehicle movement. When departures are frequent, two bays or two robots working alternately overlap auxiliary and working time, so real capacity matches the planned schedule of the loading dock.

The environment inside the trailer cannot be ignored. Summer heat, winter condensation and dusty bag surfaces all affect gripping. Grippers are selected by product: clamping plates for cartons, vacuum cups for flat bag faces, fork tines for pallets. For fragile packaging, grip force and acceleration need margins, and the pattern must be verified by trial loading.

Safety is more complex in loading. A trailer is a semi-enclosed space, and the system must confirm nobody is inside before starting; it must not run until the vehicle is secured with the brake set and chocks placed. Area scanners are interlocked with door status, walkways for drivers and loaders are separated, and e-stop buttons sit at both the dock and the driver side.

The loading system also closes the data loop. On completion an outbound record is created, and pattern data, vehicle number, time and counts are returned to the warehouse system. When linked with an AS/RS and palletisers, loading joins the line schedule as the final process; shortages or late vehicles should trigger buffering and resequencing instead of stopping the whole line.

In projects covering truss manipulators, gantry robots, truck loading, AS/RS and seventh-axis systems, Truman brings trailer positioning, stacking patterns, gripper selection and safety interlocks into one unified design, turning truck loading from a labour-intensive chore into a measurable, traceable automated node.