Unpowered roller conveyor systems, also known as free-rolling conveyors or gravity roller conveyor lines, operate on a relatively simple principle: relying primarily on the weight of the goods and friction to achieve continuous and smooth transport.
An unpowered roller conveyor system consists of multiple parallel rollers that can rotate freely without an external power source (such as a motor). When goods are placed on the roller conveyor, gravity compresses the contacting rollers, generating friction; simultaneously, the weight of the goods themselves causes a forward tendency. Under these conditions, the compressed rollers begin to rotate, transmitting this rotational force to adjacent uncompressed rollers and the goods on them, thus moving the entire item forward a certain distance before naturally stopping or continuing the kinetic energy transfer to the next point of contact until it reaches its destination. This continuous transport process allows items to move smoothly along a straight line or curve at turns to meet various process requirements. Due to their compact structure, small footprint, ease of maintenance, and low energy consumption, unpowered roller conveyor systems are widely used in industries such as food processing, packaging, and printing.
