Bin Picking Cell

Overview

Most factory automation assumes parts arrive oriented, in trays, on conveyors, from feeders. Bin picking removes that assumption: castings, forgings, or machined blanks arrive as a random pile in a steel or plastic bin, and the cell has to get them out one at a time, oriented, without a person. The problem is old enough to have a nickname ("the bin picking problem") because it couples 3D perception, grasp planning, and collision avoidance in one loop.

A complete cell is more than the robot. The arm itself is a standard 6-axis industrial robot supplied separately; this product is everything around it: the Robot Interface, the Vision System, the Gripper Set, two Bin Stations, the Controller Cabinet, and the Cell Frame and Guarding with its Safety System.

Seeing into the bin

The 3D Camera mounts above the bin on a deliberately stiff Camera Mount. Inside its Camera Housing, a Pattern Projector throws shifting fringe patterns onto the parts while two CMOS Image Sensors capture them in stereo; triangulating the deformed fringes yields a depth map with 0.1–0.3 mm noise across the bin. Structured light wins here over plain stereo because machined and shot-blasted parts are often featureless, the projector supplies the texture the matcher needs.

The point cloud goes to the Vision PC, which slides the part's CAD model over the cloud looking for 6-DoF pose matches, scores each candidate by how exposed and graspable it is, then checks that the chosen gripper can reach the grasp pose without colliding with the bin walls or neighboring parts. The result, grasp pose plus approach path, goes to the robot. All of this hinges on one transform: the hand-eye calibration solved by having the robot present the Calibration Target to the camera at known poses. The doweled Mounting Plate under the robot exists so that transform survives a robot swap.

Grasping

No single gripper empties a real bin, so the cell carries three on a Tool Changer. Its robot-side Master Plate cam-locks onto the Tool Plate of whichever tool the job needs, passing compressed air through O-Ring Set-sealed ports; idle tools wait on the Tool Stand.

The Vacuum Gripper is first choice when parts have a sealable face: a Venturi Ejector generates vacuum at the tool, bellows Suction Cups conform to tilted surfaces, and a Pressure Sensor confirms seal before the robot lifts. The Parallel Gripper handles parts that must be clamped: a Servo Motor drives the jaws, and the Encoder reading at grip closure doubles as a part-present and part-size check. For ferrous parts the Magnetic Gripper is often fastest, an electropermanent magnet whose Neodymium Magnets hold flux with zero power and whose Copper Winding pulse switches the Magnet Pole Shoe face on and off; its drawback, picking two parts at once, is managed by pole-shoe profiling and a weight check at the place station.

Deep-bin geometry drives gripper shape more than grip force does. The last parts sit in corners against two walls, and the Gripper Fingers and cup spiders are slimmed until the planner can reach them; whatever it still cannot reach becomes the 1–2% residue a person tips out when swapping bins.

Sequencing and safety

The Cell PLC runs the cycle: confirm bin seated via the Presence Sensor, trigger a scan, dispatch the pick, verify, repeat, rescanning only after the pile has been disturbed enough to invalidate the last cloud, which is how scan time stays off the critical path. Bins arrive by forklift into the Bin Locator's tapered guides on the Station Table, repeatable to a few millimeters, and the vision system absorbs the rest.

People and a blind 200 kg arm share a wall, so the safety chain is conventional and certified: Sheet Metal Panel guarding on the Extrusion Frame, guard-locking Door Interlocks on each Access Door, a Light Curtain across the bin-exchange opening positioned per ISO 13855 stopping-distance math, and dual-channel Relay logic behind the Emergency Stops. The robot may run at full speed only because nothing living can be inside the envelope while it does.