The invention relates to the technical field of plastic particle production, and particularly discloses a plastic particle online sampling
system, which comprises a feeding mechanism including a buffer hopper, a finished product hopper, a conveying
pipe and a first fan; the sampling mechanism comprises a sampling
pipe, a first valve body, a second valve body, a third valve body, a
cyclone separator, a collecting box and a second fan, the sampling
pipe is connected to the conveying pipe, the
cyclone separator is connected to the end, away from the conveying pipe, of the sampling pipe, and the collecting box is arranged at the discharging end of the
cyclone separator; the first valve body and the second valve body are both arranged on the sampling pipe, a
branch pipe is arranged on the sampling pipe and between the first valve body and the second valve body, and the third valve body and the second fan are both arranged on the
branch pipe; the guide mechanism comprises a guide piece, a baffle and a first motor. According to the sampling device, the inner wall of the sampling pipe can be cleaned, plastic particles in the previous sampling process are prevented from being taken out in the next sampling process, and the sampling accuracy can be guaranteed.