Embedded sleeve with replaceable channel

The embedded sleeve comprises a sleeve body and the channel, an installation groove is formed in the bottom wall of the sleeve body, a fixing block is arranged in the installation groove through a fixing rod, a plurality of movable grooves are formed in the side wall of the fixing block, and movable blocks are arranged in the movable grooves through elastic mechanisms. The outer wall of the channel is provided with a connecting ring through a plurality of connecting rods, a plurality of extrusion grooves are formed in the bottom wall of the barrel, extrusion plates are arranged in the extrusion grooves through extrusion mechanisms, and ejector rods matched with the extrusion plates are arranged on the outer wall of the channel. Through the arrangement of the connecting ring, the movable block and the elastic mechanism, the channel and the cylinder body can be mounted and dismounted very conveniently, the manufacturing difficulty can be reduced through the overall selection of the assembly type design, and the