1. Propeller turning device

Propeller turning device, including upper bracket, lower bracket, intermediate shaft, and nut. The intermediate shaft is fixedly connected to the lower bracket at its bottom. The upper part of the intermediate shaft is wedge-shaped and has threads on the circular surface, which match the nut. The top and bottom ends of the intermediate shaft are respectively equipped with upper and lower lifting ears. The middle part of the upper bracket is equipped with a forming ring hole that matches the wedge-shaped part of the intermediate shaft. The upper bracket is fitted onto the wedge-shaped part of the intermediate shaft with its forming ring hole, and the nut is screwed onto the intermediate shaft and compressed onto the upper bracket through a washer, forming a propeller turning device.

By installing the propeller into the upper and lower brackets and tightening it with nuts, the suspension cable does not come into contact with the propeller when lifting and turning over, completely eliminating the damage to the propeller blades and the phenomenon of suspension cable cutting. It changes the original method of spiral lifting and turning over, and is an innovative technological transformation of blade turning over. It has strong practical value for batch shipbuilding and specialized shipbuilding.

2. Control method and control system for controllable pitch marine propellers

A method for controlling the controllable pitch of ship propellers with engines, comprising the following steps: providing a power stop mode to rapidly reduce ship speed as the ship advances; Adjust the propeller pitch to the fully reverse position, while the engine power is available throughout the entire process of the vessel transitioning from forward motion to reduced forward speed. The present invention also discloses a system for controlling the pitch of a controllable pitch marine propeller of a vessel including an engine, comprising: a driving actuator movable from a forward position to a reverse position; A controller used to adjust the pitch of the propeller, so that the pitch is in a completely reverse position; The controller determines the power stop demand by monitoring the movement of the actuator, and adjusts the propeller pitch to the fully reverse position based on the power stop judgment. At the same time, the engine power is available throughout the entire process from the forward movement of the vessel to the deceleration of the vessel.

3. A propeller lifting and reversing device

A propeller lifting and reversing device, the propeller is connected to the lower end of the lifting rod, and the lifting rod is set in a rotating sleeve. The setting method of the lifting rod and the rotating sleeve is that the lifting rod can move up and down inside the rotating sleeve, and the lifting rod and the rotating sleeve cannot rotate with each other. The rotating sleeve is movable in a fixed sleeve located at the stern, and the upper end of the rotating sleeve extends from the fixed sleeve. A steering rod is set on the rotating sleeve that extends from the fixed sleeve. The steering rod is connected to the piston rod of a hydraulic cylinder fixed at the stern, and the upper end of the lifting rod is connected to the piston rod of another hydraulic cylinder fixed on the rotating sleeve through a connecting support.

Its advantages are: this propeller lifting and reversing device can quickly lift and reverse the propeller, remove the garbage or debris wrapped around the propeller, operate conveniently, have a high degree of mechanization, and ensure the normal navigation and operation of the water surface clean collection ship.

4. Control method and control system for controllable pitch marine propellers

A method for controlling the controllable pitch of ship propellers including engines, comprising: providing a ship speed indication; Use ship speed to control engine power based on any one or more parameters selected from the following: propeller pitch and ship operating mode.

A system for controlling the pitch of a controllable pitch marine propeller of a vessel including an engine, comprising: a speed device for providing an output indicating the speed of the vessel; A controller used to control engine power using the output based on any one or more parameters selected from the following: propeller pitch and operating mode of the vessel.

5. A method and device for actively controlling the thrust pulsation of watercraft propellers

A method and device for actively controlling the thrust pulsation of a watercraft propeller, which measures the magnitude of the axial thrust pulsation or axial vibration of the watercraft propeller through an axial thrust or axial vibration measurement system installed on the watercraft propulsion shaft system. Based on the magnitude of the axial thrust pulsation or axial vibration of the watercraft propeller, the thrust pulsation controller calculates the magnitude of the control force required to eliminate the thrust pulsation on the watercraft propulsion shaft system. Then, the signal of the thrust pulsation controller is amplified by a power amplifier, and the required axial control force is generated on the watercraft propulsion shaft system through a non-contact electromagnetic force actuator installed on the watercraft propulsion shaft system to control and compensate for the thrust pulsation of the watercraft propeller, So as to reduce the impact of propeller thrust pulsation on the vibration of the watercraft.

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