Action control system of cylinder arm pin, single-cylinder bolt type telescopic arm and crane

The invention relates to the technical field of engineering machinery, and provides an action control system of a cylinder arm pin, a single-cylinder bolt type telescopic arm and a crane, the action control system of the cylinder arm pin comprises a cylinder pin driving part, an arm pin driving part, a power source and a first control valve; the power source comprises a first energy accumulator, a power pump and a driving element, and the inlet end of the power pump is connected with the first energy accumulator; the first control valve is provided with an oil inlet connected with the outlet end of the power pump, an oil return opening connected with the first energy accumulator, a first working oil opening connected with the arm pin driving piece and a second working oil opening connected with the cylinder pin driving piece. By switching the state of the first control valve, the communication relation among the oil inlet, the oil return port, the first working oil port and the second working oil port can be