Suction assisting device of injector

The utility model discloses a suction auxiliary device of an injector. The device comprises a needle cylinder support, a spring, a push rod, a fastening piece and a fixing piece, the needle cylinder support is provided with a support groove used for containing an injector needle cylinder, the rear end of the needle cylinder support is provided with a fixing hole, the spring is coaxially installed in the fixing hole, one end of the push rod extends into the fixing hole and is connected with the spring, the push rod can do linear reciprocating motion along the fixing hole, and the fastening piece is connected with the fastening piece. The other end of the push rod is connected with a piston handle fixing wing, a clamping groove used for fixing a syringe piston handle is formed in the piston handle fixing wing, and the fastening piece is arranged on the needle cylinder support and used for fastening a syringe needle cylinder to the needle cylinder support. And the fixing piece is used for keeping the spring in a