The invention relates to a rotary drive for a drum in a winch on a support frame that has two parallel rotary piston motors that can be operated independently, each of which has a housing and a shaft. The housings are each connected to the drum for conjoint rotation. There is a reversible freewheel coupling between the shafts and the support frame in the force-transferring path, with which the respective shafts can be connected to the support frame for transferring forces.

The invention relates to a rotary drive for a drum in a winch on a support frame that has two parallel rotary piston motors that can be operated independently, each of which has a housing and a shaft. The housings are each connected to the drum for conjoint rotation. There is a reversible freewheel coupling between the shafts and the support frame in the force-transferring path, with which the respective shafts can be connected to the support frame for transferring forces.

A large-scale tool hoisting device for offshore electric power construction is provided. A steel cable retracted to winches is dried using the heat in the operating cabin, thereby preventing the steel cable from being in a wet state for a long time and being corroded by seawater. For different loads at the terminal of the steel cable, a transmission ratio between a drive wheel and a control wheel is changed through the sliding of the drive wheel. Without changing the rotational speed of the drive motor, the moving speed of the steel cable is effectively and correspondingly improved by reducing the pulling force of the steel cable, or a large pulling force can be provided for the steel cable by reducing the moving speed of the steel cable. The transmission ratio can be changed in the hoisting process.

A large-scale tool hoisting device for offshore electric power construction is provided. A steel cable retracted to winches is dried using the heat in the operating cabin, thereby preventing the steel cable from being in a wet state for a long time and being corroded by seawater. For different loads at the terminal of the steel cable, a transmission ratio between a drive wheel and a control wheel is changed through the sliding of the drive wheel. Without changing the rotational speed of the drive motor, the moving speed of the steel cable is effectively and correspondingly improved by reducing the pulling force of the steel cable, or a large pulling force can be provided for the steel cable by reducing the moving speed of the steel cable. The transmission ratio can be changed in the hoisting process.

A large-scale tool hoisting device for offshore electric power construction is provided. A steel cable retracted to winches is dried using the heat in the operating cabin, thereby preventing the steel cable from being in a wet state for a long time and being corroded by seawater. For different loads at the terminal of the steel cable, a transmission ratio between a drive wheel and a control wheel is changed through the sliding of the drive wheel. Without changing the rotational speed of the drive motor, the moving speed of the steel cable is effectively and correspondingly improved by reducing the pulling force of the steel cable, or a large pulling force can be provided for the steel cable by reducing the moving speed of the steel cable. The transmission ratio can be changed in the hoisting process.

An electric winch device including an electric motor that rotates a winch drum in a hoisting direction, and generates regenerative electric power when a rotation of the winch drum in a lowering direction is transmitted to the electric motor, a transmission device that transmits the rotation between the electric motor and the winch drum, a power calculating section that calculates power of the target object by freefall, and a control section that controls an operation of the transmission device. When the power calculated by the power calculating section exceeds reference electric power, the control section causes the transmission device to change the transmission rate of the rotation to a transmission rate at which the regenerative electric power generated by the electric motor is equal to or smaller than the reference electric power.

An electric winch device including an electric motor that rotates a winch drum in a hoisting direction, and generates regenerative electric power when a rotation of the winch drum in a lowering direction is transmitted to the electric motor, a transmission device that transmits the rotation between the electric motor and the winch drum, a power calculating section that calculates power of the target object by freefall, and a control section that controls an operation of the transmission device. When the power calculated by the power calculating section exceeds reference electric power, the control section causes the transmission device to change the transmission rate of the rotation to a transmission rate at which the regenerative electric power generated by the electric motor is equal to or smaller than the reference electric power.

A hoist system for cable-reeling operations is disclosed herein. The hoist system includes a housing, a drum disposed within the housing and configured to spin about an axis, a motor configured to spin the drum about the axis, a cable configured to be wound and unwound from the drum as the motor spins the drum about the axis, a cable sensor configured to detect misalignment of the cable during the cable-reeling operations, and a motor controller operatively coupled to the cable sensor and the motor, wherein the motor controller is configured to receive a cable misalignment signal from the cable sensor and adjust operation of the motor in response to the cable misalignment signal.

A method for autonomous restriction navigation comprising the steps of: 1) defining one or more restriction specifications in a digital execution program; 2) inputting the digital execution program into a core algorithm; 3) comparing a current depth of a toolstring against the one or more restriction specifications; 4) predicting a future action of the toolstring; 5) determining one or more appropriate gears based on the future action of the toolstring; and 6) comparing the one or more appropriate gears with another one or more appropriate gears to determine an output.

A method for autonomous restriction navigation comprising the steps of: 1) defining one or more restriction specifications in a digital execution program; 2) inputting the digital execution program into a core algorithm; 3) comparing a current depth of a toolstring against the one or more restriction specifications; 4) predicting a future action of the toolstring; 5) determining one or more appropriate gears based on the future action of the toolstring; and 6) comparing the one or more appropriate gears with another one or more appropriate gears to determine an output.