unit drive
6.DISCUSSION FOR THE DIAGNOSIS METHOD OF THE ROD AND TUBE PARTIAL-WEAR OF THE WELL PUMP UNIT IN THE WATER- DRIVE
7.Field use and test shows that, (1) the coupler drive system improves the soft characteristics in the starting and transmission of the pumping unit; (2) the new drive system solves the problems of drive slippage and frequent change of rubber belt; (3) it provides large transmission rate and enables adjusting the stroke number optionally; (4) the system efficiency of the pumping unit can be improved and power consumption can be lowered by using the coupler drive system.

