Abstract: A robot for pond desilting is provided, which includes a frame, a lead screw sliding table, and a suction pipe. An end of the frame is provided with a pressure-resistant cabin. A lead screw base is disposed on the lead screw sliding table. A rotary lead screw is disposed on the lead screw sliding table. The lead screw base is disposed on the rotary lead screw. Waterproof motors are disposed above the lead screw base, a pump body is disposed in the frame, and the suction pipe is disposed at an end of the pump body. When the robot is placed at the bottom of the pond, the motor inside the pressure-resistant cabin drives the power wheels to rotate, the power wheels drive the tracks to rotate around the power wheels, bearing wheels, and tension wheels, thereby driving the frame to move.

Abstract: A multistep diaphragm pump comprising: a pump body; a main shaft; a reciprocated driving mechanism driven by the main shaft; a driving shaft connected with the reciprocated driving mechanism and extended into the working chamber of the pump body; on the relevant driving shaft there is provide a plurality of dish type diaphragms which are connected in series; in front of each dish type diaphragm there is fixed a piston having a sealing ring; between the adjacent two dish type diaphragms is filled with hydraulic medium, wherein the piston situated in the front of the most front dish type diaphragm directly contacts with the liquid material in the working chamber, a suction check valve and a discharge check valve are provided in the working chamber; the driving mechanism is constituted by the main shaft, the eccentric shaft, the driving plate, the articulated bearings and the bridge board, therefore the driving shaft can be moved reciprocally.