Ring net box

The utility model discloses a ring main unit which comprises a box body, an installation cavity is formed in the box body, a movable cavity is formed in the bottom end of the installation cavity, a screw rod is movably arranged in the movable cavity through a bearing, one end of the screw rod penetrates through the box body and is arranged on the outer side of the box body, and movable blocks are arranged on the two sides of the screw rod in a sleeved mode. Through the use of the device, the limiting block can be stabilized in the limiting groove through the telescopic rod and the spring, so that the cooling fan is stabilized on one side of the mounting groove, through the arc-shaped arrangement of the limiting block and the limiting groove, the cooling fan is convenient to replace, and the cooling fan is convenient to use. And the movable plate is driven by the screw rod to move, so that different electrical components can be stabilized between the fixed plate and the movable plate, the operation is simple a