Importance

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Abstract

The present disclosure provides a trenchless multi-stage pipe cleaning device and method combining an artificial tornado and dagger-like mechanical sand. The trenchless multi-stage pipe cleaning device includes a primary pipe cleaning device and a secondary pipe cleaning device that are connected. An outer wall of the pipe cleaning device is provided with multiple air inlet joint pipes evenly distributed in a circumferential direction. The air inlet joint pipes are connected to an air compressor. Each of the air outlet joints is connected to a nozzle. The primary pipe cleaning device is connected to a vibrating screen. The trenchless multi-stage pipe cleaning device further includes a back-end sewage discharge device. The trenchless multi-stage pipe cleaning method includes: supplying compressed air into an inner chamber of the primary pipe cleaning device to mix with mechanical sand, so as to form a primary gas-solid mixed flow; allowing the primary gas-solid mixed flow to enter the secondary pipe cleaning device; forming an artificial tornado by multiple streams of diagonally tangential high-speed air entering an inner chamber of a secondary pipe cleaning device body; changing, by the artificial tornado, a movement trajectory of the primary gas-solid mixed flow into a spiral shape, tangential with an inner wall of a cleaning target; and driving the primary gas-solid mixed flow to move forward to form a secondary gas-solid mixed flow; where during this process, the mechanical sand continuously scrape and collide with the inner wall of the cleaning target, so as to achieve a desired efficient trenchless water-free pipe cleaning effect.

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First Claim