Abstract: In response to the phenomenon that the two half shell bucket attachments of the material grabbing machine are prone to impact or gnaw on the material stacking platform during the clearance operation of bulk material loading and unloading, the motion trajectory of the grab bucket during the closing process is analyzed, and an adaptive hydraulic system for the cleaning condition of the material grabbing machine is proposed. This system uses angle displacement sensors to real-time collect the angles between components such as the boom, arm, and grab, and determines the posture of the fixture device. Then, combined with a mechanical model, it calculates the pressure and flow requirements of the boom floating cylinder, thereby controlling the pump's inclined plate swing angle and the cylinder pressure of the floating cylinder. This achieves the overall floating and lifting of the working device during the grab closure process, ensuring that the motion trajectory of the grab teeth completely coincides with the cleaning work surface. Practice has proven that the floating hydraulic system of the boom has the characteristics of efficient filling rate, intelligent floating lifting, significant cost-effectiveness, and wide application prospects.