Permanent magnet frequency conversion screw machine convenient to disassemble and assemble

The permanent magnet frequency conversion screw machine comprises a permanent magnet frequency conversion screw machine body, an opening is formed in one side of the permanent magnet frequency conversion screw machine body, a clamping groove is formed in the top face of the permanent magnet frequency conversion screw machine body, and a maintenance door is connected into the clamping groove in a sliding mode. Limiting grooves are formed in the two ends, close to the inner sides of the clamping grooves, of the top of the permanent magnet frequency conversion screw machine body correspondingly, and limiting blocks are fixedly connected to the two ends of the side, close to the limiting grooves, of the maintenance door correspondingly. When the inside needs to be overhauled and maintained, the fastening bolt is screwed out, the maintenance door is moved upwards, the movable block slides to enable the limiting plate to slide into the limiting opening, and the limiting plate is installed and fixed through the fast