Sound attenuating and buffering device for concrete pump truck

• Main Authors: FAN AIHUA, ZHANG JUNFENG, WANG JIA, XUE YUEXIA, MAO JING
• Format: Patent
• Language: Chinese; English
• Published: 22.06.2011
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

The utility model relates to a sound attenuating and buffering device for a concrete pump truck. The device comprises a pilot-operated type overflow valve, a secondary unloading valve and two two-position four-way electromagnetic directional valves, wherein an oil inlet of the pilot-operated type overflow valve is connected with a main oil circuit of the concrete pump truck; a pilot control port of the pilot-operated type overflow valve is connected with an oil inlet of the secondary unloading valve and an oil inlet of one two-position four-way electromagnetic directional valve respectively; oil in an oil return opening of the pilot-operated type overflow valve directly flows back to an oil tank after passing through a filter; an oil inlet of the other two-position four-way electromagnetic directional valve is connected with an oil compressing opening of the secondary unloading valve, and the oil return openings of the two two-position four-way electromagnetic directional valves are confluent, so as to enable