Needle cylinder structure of knitting machine heart

The needle cylinder structure of the knitting machine heart comprises a needle cylinder, a needle groove is formed in the outer circle wall of the needle cylinder, a guide groove is formed in the top face of the needle cylinder, a fixing cylinder fixed to the needle cylinder through a bolt is inserted into the inner circle wall of the needle cylinder, and fixing rods distributed annularly are connected to the outer circle wall of the fixing cylinder in a welded mode. The needle grooves and the guide grooves are annularly distributed, the needle grooves are perpendicular to the guide grooves, the needle grooves are communicated with the corresponding guide grooves, the fixing rod is inserted into the needle grooves and the guide grooves and is of an L-shaped structure, and a first wear-resisting strip is arranged on the vertical part, located in the needle grooves, of the fixing rod. And a second wear-resistant strip is arranged on the horizontal part, positioned in the guide groove, of the guide rail. The nee