Ash removal device

The invention discloses an ash removal device, comprising a plurality of groups of mechanical arms, a movable frame, a motor, a lead screw, a slide block and a push rod, wherein each group of mechanical arms comprise a plurality of mechanical arms; each mechanical arm comprises a clamp and a brush body which is arranged in the clamp; the brush bodies wrap the peripheries of heat exchanger smooth tubes; the clamps of the plurality of groups of mechanical arms are all fixed on the movable frame; the lead screw is connected with the motor; the longitudinal axial direction of the lead screw is parallel to that of the heat exchanger smooth tube; threads in the slide block are arranged in adaption with threads on the lead screw; the slide block sleeves the lead screw, and moves along the longitudinal axial direction of the lead screw under the drive of rotation of the lead screw; one end of the push rod is fixed on the slide block and the other end is fixed on the movable frame; the slide block moves along the longitudinal axial direction of the lead screw to drive the push rod and the movable frame which is connected with the push rod to move along the longitudinal axial direction of the lead screw. The device is capable of clearing away ashes deposited on the smooth tubes from the surfaces of the smooth tubes, thus the heat exchange efficiency of the heat exchanger is greatly improved.