Well, they DO say that December is the Season of Miracles, but this design was a challenge.
The customer makes car bumper assemblies for a number of upmarket prestigious marques such as Jaguar, and have stringent quality controls imposed upon them. The requirement was a system to move painted assemblies from the painting robots to a quality control inspection area, onwards to a polishing area, and finally to their storage stillages.
The specification was that there must be minimal contact between the conveyor and the bumper assemblies, that the conveyor must not mark or smudge the assemblies in any way, and that it must be both variable height AND variable width (?) in order to accommodate a wide range of different assembly types.
Our solution was to create a dual-track chain conveyor with independent drives. Each track of the conveyor is independently mounted on a mobile frame. By “pushing” two of these units together, you create the final conveyor system. Locking bars allow you to adjust the width between the two tracks, and hence the effective width of the conveyor.
The product itself sits on thousands of metal ‘blades’. Each blade connects to the chain drive below (and is hence propelled down the length of the conveyor, finally disappearing ‘underneath’ the unit for the return trip). The upper surface of each blade – upon which the bumper assemblies sit – is a specialist silicone material that ensures that the assemblies are not marked.
This solution provides only a few square millimeters of contact between the carrying surface (the blades) and the bumper assemblies.
| The unit under test, carring a Jaguar bumper assembly. |
| A close up of the 'blades' that actually carry the products. |