A fairlead for use with a winch is disclosed. The fairlead includes: a device for detecting a speed at which a line is being spooled or unspooled from the winch, a first and second roller adapted to aid in spooling or unspooling a line, a fairlead motor for driving at least the first roller, and a controller connected to the fairlead motor. The controller is in communication with the device for detecting the speed. The controller is configured to direct the fairlead motor to drive at least the first roller at a speed that maintains tension on the line as it is unspooling or spooling. Alternatively, the device measures current drawn by the fairlead motor and the controller directs the fairlead motor to drive the rollers at a speed that maintains a target current draw.

A fairlead for use with a winch is disclosed. The fairlead includes: a device for detecting a speed at which a line is being spooled or unspooled from the winch, a first and second roller adapted to aid in spooling or unspooling a line, a fairlead motor for driving at least the first roller, and a controller connected to the fairlead motor. The controller is in communication with the device for detecting the speed. The controller is configured to direct the fairlead motor to drive at least the first roller at a speed that maintains tension on the line as it is unspooling or spooling. Alternatively, the device measures current drawn by the fairlead motor and the controller directs the fairlead motor to drive the rollers at a speed that maintains a target current draw.

The present disclosure may be embodied as a rotary actuator for lifting a load against gravity. The actuator includes a housing and a drive motor attached to the housing. The drive motor has a drive shaft. The drive shaft may be configured to be manually operated. A rotatable output shaft is attached to the housing and in mechanical communication with drive shaft. The actuator includes at least one spring which is configured to act on the output shaft to at least partially offset a weight of the load. The at least one spring may be a torsion spring. The at least one spring may be configured to unwind when the motor is driven to lift the load, and may be configured to be wound when the motor is driven to lower the load. The at least one spring may comprise a plurality of springs, such as torsion springs.

A miniature handheld electric traction device including a shell, a power supply part, a power motor, a reduction gear set, a braking part and a winding drum, wherein the power motor, the reduction gear set and the winding drum are arranged in the shell; the power motor is linked with the winding drum through the reduction gear set; a surface of the winding drum is wound with a traction rope; the reduction gear set includes a planetary gear; the sun gear of the planetary gear is coaxial with the winding drum; the power motor or the motor shaft of the power motor is inserted into the inner ring of the winding drum; the motor shaft is linked with the planetary gear.

A miniature handheld electric traction device including a shell, a power supply part, a power motor, a reduction gear set, a braking part and a winding drum, wherein the power motor, the reduction gear set and the winding drum are arranged in the shell; the power motor is linked with the winding drum through the reduction gear set; a surface of the winding drum is wound with a traction rope; the reduction gear set includes a planetary gear; the sun gear of the planetary gear is coaxial with the winding drum; the power motor or the motor shaft of the power motor is inserted into the inner ring of the winding drum; the motor shaft is linked with the planetary gear.

A hoisting mechanism of a crane comprising at least one rope drum for a hoist rope, at least one hoist motor for driving the rope drum, a gearing coupled between the rope drum and the hoist motor, and having an input gear on the hoist motor side and an output gear on the rope drum side, and a brake for braking the input gear. The gearing has a differential to which a first input gear and a second input gear are arranged, wherein the first input gear and the second input gear are coupled to each other and further coupled to the output gear, wherein a first hoist motor connected to the first input gear, and a second hoist motor connected to the second input gear are arranged, and wherein the first input gear and the second input gear have unequal total gear ratios relative to an output shaft. The invention also relates to a method for operating this hoisting mechanism.

A hoisting mechanism of a crane comprising at least one rope drum for a hoist rope, at least one hoist motor for driving the rope drum, a gearing coupled between the rope drum and the hoist motor, and having an input gear on the hoist motor side and an output gear on the rope drum side, and a brake for braking the input gear. The gearing has a differential to which a first input gear and a second input gear are arranged, wherein the first input gear and the second input gear are coupled to each other and further coupled to the output gear, wherein a first hoist motor connected to the first input gear, and a second hoist motor connected to the second input gear are arranged, and wherein the first input gear and the second input gear have unequal total gear ratios relative to an output shaft. The invention also relates to a method for operating this hoisting mechanism.

In an integrated structure of a power source of a power winch and an electric control box, the electric control box of the power winch is integrally combined with the top of the power source by a support frame, and an outer cover is provided for axially covering the electric control box and the power source and locked and connected to a front shell wall, so that the electric control box and the power source are completely hidden in the outer cover without any exposure. In other words, the electric control box is combined with the power source by a hidden assembly mode, so that the electric control box can be securely assembled without any risk of being shaken or falling off. In the meantime, the electric control box is hidden in the outer cover, and thus it will not be affected by weather at all.

A skip hoist of a blast furnace includes a winch system. In order to provide an improved drive system for a skip hoist of a blast furnace, the winch system includes a winch drum, rotatably mounted about a drum axis; at least three drive motors; and a transmission for transferring a drive force from each of the drive motors to the winch drum.

The skip hoist further relates to a blast furnace.

A skip hoist of a blast furnace includes a winch system. In order to provide an improved drive system for a skip hoist of a blast furnace, the winch system includes a winch drum, rotatably mounted about a drum axis; at least three drive motors; and a transmission for transferring a drive force from each of the drive motors to the winch drum.

The skip hoist further relates to a blast furnace.