US 2003/0205703 A1 · Hoist apparatus

Abstract

The invention relates to a hoist apparatus including at least one of a three-part double reeved bottom block that has the same height profile as a two-part bottom block and the same lifting capacity as a three-part bottom block that includes an integral equalizer sheave nest, a device for limiting the rotation of a hoist drum beyond a desired position, a hybrid gear box adapted for use on two different categories and/or types of hoist apparatuses through the use of an adapter plate that permits coupling of the gearbox to the hoist drum of the hoist apparatus in a plurality of configurations and an external ring gear that results in a second output torque and speed of the gearbox, a self-lubricating load braking assembly having lubrication inlet holes and lubrication outlet holes for pumping lubrication into and out of the load brake assembly, a gearbox for use on the hoist apparatus including a two-stage high gear ratio gear set and a load brake assembly, a controller configured to acquire operational data representative of the hoist apparatus and generate an output indicative of a remaining useful life of the hoist apparatus, and an inverter controller configured to control verify load integrity and prevent possible load loss without the use of a load brake assembly and/or an encoder or similar feedback device.

A hoist apparatus comprising:

a frame;
a hoist drum supported by the frame for rotation about a hoist drum axis;
a hoist motor coupled to the hoist drum for selectively rotating the hoist drum in opposite wind-on and wind-off directions about the hoist drum axis;
a hoist rope wound around the hoist drum such that the hoist rope winds on to and off of the hoist drum in response to rotation of the hoist drum in the wind-on and wind-off directions, respectively;
and
at least two of
a three-part bottom block supported by the hoist rope such that the three-part bottom block travels up and down in response to rotation of the hoist drum in the wind-on and wind-off directions, respectively, wherein the three-part bottom block includes a cross shaft and at least one running sheave rotatably supported by the cross shaft, wherein the hoist rope is dead-ended on the cross shaft,
a proximity limit switch wherein the proximity limit switch is mounted on the frame adjacent the hoist drum such that the hoist drum moves relative to the proximity limit switch, the proximity limit switch sensing at least one of the presence and the absence of the hoist rope without touching the hoist rope, and the proximity limit switch preventing the hoist motor from rotating the hoist drum in one of the wind-on direction when the switch senses the presence of the hoist rope on the hoist drum at the maximum wind-on point and the wind-off direction when the proximity limit switch senses the absence of the hoist rope on the hoist drum at the maximum wind-off point,
a gearbox, a ring gear external to the gearbox, and an adapter plate coupled to the gearbox, wherein the ring gear is coupled to the hoist drum for selectively rotating the hoist drum in opposite wind-on and wind-off directions about the hoist drum axis in response to the hoist motor, wherein the gearbox is configured to be coupled to the hoist motor and the hoist drum, and the adapter plate permitting coupling of the gearbox to the hoist drum in a plurality of orientations,
a gearbox coupled to the hoist motor and the hoist drum, wherein the gearbox includes a gear and a load brake assembly, the load brake assembly having a load shaft supported by the gearbox for rotation, wherein the load shaft includes a first end and a second end, a pinion coupled to the first end of the load shaft, wherein the pinion meshes with the gear, a pressure plate coupled to the first end of the load shaft inboard of the pinion, wherein the pressure plate includes a plurality of lubrication inlet holes, the lubrication inlet holes aligned to receive lubrication propelled by the meshing action of the pinion and the gear, a plate gear coupled to the second end of the load shaft, the plate gear including a first side nearest the first end of the load shaft and a second side nearest the second end of the load shaft, wherein the plate gear includes a plurality of lubrication outlet holes, the lubrication outlet holes being angled radially outwardly from the first side of the plate gear to the second side of the plate gear, and a ratchet disc located between the pressure plate and the plate gear,
a gearbox coupled to the hoist motor and the hoist drum, wherein the gearbox includes a gear and a load brake assembly, the load brake assembly having a load brake assembly and a two-stage high performance gear set,
a controller configured to analyze operational data and generate an output indicative of a remaining useful life of the hoist apparatus, wherein the controller includes a memory, a microprocessor, and an input and output interface, wherein the input and output interface is adapted to acquire operational data representative of the hoist apparatus and provide the operational data to at least one of the memory for storage and the microprocessor for processing, wherein the operational data includes at least one of a measurement of load weight, a measurement of hoist motor starts, a measurement of hoist motor stops, and a measurement of a lift speed, wherein the microprocessor is adapted to generating a value based on the operational data, wherein the value includes at least one of a percent load lifted, hoist motor total run time, total work done, actual duty cycle of the hoist apparatus, and useful remaining life of the hoist apparatus, and wherein the microprocessor is adapted to communicate with a user interface via the input and output interface, the communication including communication of the output to the user interface, and
an inverter, a current sensor, and an inverter controller, wherein the inverter is electrically connected to the hoist motor and configured to generate an inverter signal that drives the hoist motor, wherein the current sensor is configured to sense a current of the inverter signal and to generate a current signal having a relationship to the sensed current, and wherein the inverter controller is configured to receive the current signal, determine a modeled value of the hoist motor based in part on the current signal, compare an actual value of the hoist motor to the modeled value of the hoist motor for determining whether a load coupled to the hoist apparatus is stable, and generate an output that sets a brake device when the load coupled to the hoist apparatus is potentially unstable.

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Hoist apparatus

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Hoist apparatus

Life of this patent

Abstract

Claims29