Integral stroke adjusting mechanism for duplex metering pump

The invention discloses an integral type stroke adjusting mechanism for a duplex metering pump. The integral type stroke adjusting mechanism is characterized by comprising an integral type main shaft, eccentric blocks symmetrically installed on the integral type main shaft, a sliding shaft driving the eccentric blocks to move and a screw pitch multiplier installed on the sliding shaft and used for adjusting the stroke. A connecting rod and a plunger connected with the connecting rod are mounted on the eccentric block; a sliding shaft pin is mounted on the sliding shaft; the eccentric block and the integral main shaft are respectively provided with an eccentric guide chute and a U-shaped chute which are matched with the sliding shaft pin; a sliding shaft pin on the sliding shaft penetrates through a U-shaped sliding groove in the integral main shaft to be installed in an eccentric guide chute in the eccentric block, so that the eccentric block is installed on the integral main shaft. The sliding shaft pin on t