| 摘要 |
<p>A conveyor and method for preventing stick-slip friction conditions from exciting the conveyor into surging and for preventing surging vibration from adversely affecting operation of the conveyor. The conveyor (30) has a pair of endless, flexible roller chains (38,40) that are laterally spaced apart and carried on sprockets (42) keyed to a drive shaft (46) that is in communication with a drive (50) at one end of the frame (32) and sprockets (44) keyed to a take-up shaft (48) at the opposite end of the frame. Preferably, the take-up shaft is split into two shaft sections rotatively secured adjacent their ends by a pair of bearings on a mounting block to permit each conveyor chain to move on its idle sprocket independently of the other chain. The conveyor components are selected to provide a combination of chain stiffness and conveyor mass moment of inertia at maximum payload that produces a conveyor having a high enough natural frequency to prevent stick-slip friction conditions from exciting the conveyor chains into surging. Should a conveyor possess a natural frequency falling within the range of natural frequencies causing the conveyor to be susceptible to surging, a dampener that includes a flywheel disc coupled to the conveyor take-up shaft by a spring is attached to one or preferably both ends of the take-up shaft of the conveyor for preventing stick-slip from exciting the conveyor chains into surging and reducing the amplitude of any surging vibrations which might occur so they do not adversely affect operation of the conveyor.</p> |
