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rubber spring circle type belt conveyor buffer roller 

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TDL-QH spring rubber ring buffer roller

The side rollers are connected to support beams by chains, rollers at both sides are connected by support combined by screw spring and axes. The spring force can be adjusted. There are several rubber buffer rings on the rollers in order to diplex buffering. When there are big block material, material makes impaction on rubber belt, and screw spring will reduce the impact force. Buffer ring gives assistant to reduce the force. The force of spring force can be adjusted by the actual situation of material.