Floating control system for fixed displacement pump system

A floating control system for a fixed displacement pump system, comprising:

• a fixed displacement pump, floating control valves, a floating mechanism, boom function valves, an actuator and a control device, wherein the fixed displacement pump, the floating control valves and the floating mechanism are connected in sequence, the fixed displacement pump, the boom function valves and the actuator are connected in sequence, the floating control valves comprise a pressure reducing valve and a floating switching valve, and the boom function valves comprise a fixed differential overflow valve and a proportional directional valve for controlling a direction change of the actuator;
• the fixed differential overflow valve and the proportional directional valve are connected in parallel between the fixed displacement pump and an oil return tank, the floating switching valve and the fixed differential overflow valve are connected through a feedback oil path, and a one-way valve is arranged between the floating switching valve and the fixed differential overflow valve;
• and the actuator is connected to the feedback oil path through the proportional directional valve, and a motor for driving the fixed displacement pump to rotate, solenoid valves for controlling actions in the floating control valves and solenoid valves for controlling actions in the boom function valves are all connected to the control device.