US-12624750-B2 - Gear reducer with balanced output of very large torque from plurality of motors

US12624750B2US 12624750 B2US12624750 B2US 12624750B2US-12624750-B2

Abstract

The present invention relates to the field of hoisting drive systems for power shovels, and particularly to a reducer with balanced output of a very large torque from a plurality of motors, including a first motor shaft, a second motor shaft, a third motor shaft and a fourth motor shaft, which are each drivingly connected to the plurality of motors. In addition to outputting a very large torque employing the plurality of motors with the reducer, the reducer of the present invention can ensure that the output is balanced and stable, remarkably enhancing performance, safety and stability of a hoisting drive system for a power shovel. Adjustable motor transmission assemblies assembled on exterior lateral surfaces of the first motor shaft, the second motor shaft, the third motor shaft and the fourth motor shaft can adjust the number and locations of power transmission grooves according to the number and locations of actually active motors, greatly increasing applicability. Such adjustments are accomplished by a compact and sensible internal layout and design, without affecting external power transmission or heat dissipation spaces.

Inventors

Zhencai Zhu
Hu Hu
Guohua Cao
Zhisheng Tang
Wenbo Ma
Weiwei Li

Assignees

Jiangsu Guomao Reducer Co. Ltd.
CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Dates

Publication Date: 20260512
Application Date: 20241022
Priority Date: 20240119

Claims (8)

1 . A reducer, comprising a first motor shaft, a second motor shaft, a third motor shaft and a fourth motor shaft, each configured to be drivingly connected to a motor, wherein an upper left vertically positioned transmission gear and a lower left vertically positioned transmission gear which are mutually driven are disposed in a top-down orientation each between the first motor shaft and the second motor shaft, an upper right vertically positioned transmission gear and a lower right vertically positioned transmission gear mutually driven are disposed in a top-down orientation each between the third motor shaft and the fourth motor shaft ( 4 ), the upper left vertically positioned transmission gear and the upper right vertically positioned transmission gear are drivingly connected by a first horizontally positioned transmission shaft, and the lower left vertically positioned transmission gear and the lower right vertically positioned transmission gear are drivingly connected by a second horizontally positioned transmission shaft, adjustable motor transmission assemblies are assembled on exterior lateral surfaces of the first motor shaft, the second motor shaft, the third motor shaft and the fourth motor shaft, and torque adjustment assemblies are axially mounted on right side walls of the upper left vertically positioned transmission gear, the lower left vertically positioned transmission gear, the upper right vertically positioned transmission gear and the lower right vertically positioned transmission gear; wherein horizontally positioned transmission links are provided between upper and lower ends of the first motor shaft and the torque adjustment assemblies on the upper left vertically positioned transmission gear and the lower left vertically positioned transmission gear, between upper and lower ends of the second motor shaft and the torque adjustment assemblies on the upper left vertically positioned transmission gear and the lower left vertically positioned transmission gear, between upper and lower ends of the third motor shaft and the torque adjustment assemblies on the upper right vertically positioned transmission gear and the lower right vertically positioned transmission gear, and between upper and lower ends of the fourth motor shaft and the torque adjustment assemblies on the upper right vertically positioned transmission gear and the lower right vertically positioned transmission gear; wherein the torque adjustment assemblies comprise first fixation holders and second fixation holders fixed on right side surfaces of the upper left vertically positioned transmission gear, the lower left vertically positioned transmission gear, the upper right vertically positioned transmission gear and the lower right vertically positioned transmission gear, first adjustment struts fixedly mounted to outer side surfaces of the first fixation holders, second adjustment struts fixedly mounted to the second fixation holders and toothed gear heads axially fixed to outer telescopic sections of the first adjustment struts and the second adjustment struts; wherein: when the toothed gear heads of the first adjustment struts and the toothed gear heads of the second adjustment struts engage with the horizontally positioned transmission links, the upper left vertically positioned transmission gear, the lower left vertically positioned transmission gear, the upper right vertically positioned transmission gear and the lower right vertically positioned transmission gear are driven to rotate through a rotation of the horizontally positioned transmission links, and when the toothed gear heads of the first adjustment struts and the toothed gear heads of the second adjustment struts are disengaged from the horizontally positioned transmission links, the upper left vertically positioned transmission gear, the lower left vertically positioned transmission gear, the upper right vertically positioned transmission gear and the lower right vertically positioned transmission gear separate from the first motor shaft, the second motor shaft, the third motor shaft and the fourth motor shaft.
2 . The reducer according to claim 1 , wherein inwardly-projecting integral internal mounting rings are fixed at middle locations of inner circumferential surfaces of the first motor shaft, the second motor shaft, the third motor shaft and the fourth motor shaft, and that vertically positioned adjustment apertures in cooperation with the adjustable motor transmission assemblies are formed in the exterior lateral surfaces of the first motor shaft, the second motor shaft, the third motor shaft and the fourth motor shaft.
3 . The reducer according to claim 2 , wherein the adjustable motor transmission assemblies comprise first raisable and lowerable spacer rings movably sleeved at upper ends of outer circumferential surfaces of the first motor shaft, the second motor shaft, the third motor shaft and the fourth motor shaft, second raisable and lowerable spacer rings movably sleeved at lower ends of the outer circumferential surfaces of the first motor shaft, the second motor shaft, the third motor shaft and the fourth motor shaft, first electronically controlled struts fixed to upper ends of the internal mounting rings, second electronically controlled struts fixedly mounted to lower ends of the internal mounting rings, first internal control rings axially fixed to bottoms of telescopic sections of the first electronically controlled struts, and second internal control rings axially fixed to tops of the telescopic sections of the second electronically controlled struts.
4 . The reducer according to claim 1 , wherein internal control shafts drivingly connected to the horizontally positioned transmission links are fixedly assembled at cores of the first motor shaft, the second motor shaft, the third motor shaft and the fourth motor shaft by lateral supports.
5 . The reducer according to claim 1 , wherein circular intermediate through-bores in cooperation with the horizontally positioned transmission links are formed at centers of the upper left vertically positioned transmission gear, the lower left vertically positioned transmission gear, the upper right vertically positioned transmission gear and the lower right vertically positioned transmission gear, and that internal guide vanes are axially sleeved on exterior lateral surfaces of the horizontally positioned transmission links.
6 . The reducer according to claim 5 , wherein oblique guide holes in communication with interiors of the circular intermediate through-bores are formed in inner walls of exterior gear teeth spaces of the upper left vertically positioned transmission gear, the lower left vertically positioned transmission gear, the upper right vertically positioned transmission gear and the lower right vertically positioned transmission gear.
7 . The reducer according to claim 5 , wherein annular diffuser hubs are provided at openings of the circular intermediate through-bores on both sides thereof.
8 . The reducer according to claim 3 , wherein annular transmission bevel gear frames are fixedly assembled to lower surfaces of the first internal control rings and upper surfaces of the second internal control rings, and central guide sleeves are fixed by internal supports to the first internal control rings and the second internal control rings.

Description

RELATED APPLICATIONS This application is a continuation-in-part (CIP) application claiming benefit of PCT/CN2024/079216 filed on Feb. 29, 2024, which claims priority to Chinese Patent Application No. 202410077774.8 filed on Jan. 19, 2024, the disclosures of which are incorporated herein in their entirety by reference. FIELD OF THE INVENTION The present invention relates to the technical field of hoisting drive systems for power shovels, and particularly to a reducer with balanced output of a very large torque from a plurality of motors. DESCRIPTION OF THE PRIOR ART As an important foundation of the national economy, the water conservancy and mining industries undertake the task of providing transportation, electricity, as well as coal and various mineral raw materials. Gate hoist and ship-lift systems are mainly used to provide transportation in hydroelectric dams. As these systems are required to hoist heavy weights, they must be powered by very large reducers. As one of the main heavy-duty equipment for open-cut mining, power shovels are primarily used in opencast mines to strip and remove overburden and extract and load minerals. Most power shovels employ reducers to actuate their buckets. Most very large hoists employ reducers to provide vertical transportation. Most very large scraper and belt conveyors employ reducers to provide horizontal conveyance. Existing drive systems for power shovels are essentially composed of one or more electric motors, a reducer and a winch. As ship lifters, power shovels, hoists, scraper conveyors and the like handle very heavy weights including their own weights and loads' weights, reducers used in such equipment are required to provide a very large output torque. Most existing reducers achieve this by a design employing a dual-motor parallel input along with a two-stage fixed-axis gear transmission matching a single-shaft output reducer, or a single motor with a two-stage planetary gear reducer. Although the design employing two-stage reduction with the dual-motor parallel input can provide a greater torque by combining power from both motors, this requires balanced output of the two motors when they are both in operation. Otherwise, unbalanced output of the motors will directly affect the output of the reducer and may eventually make it impossible to provide consistent hoisting. The design employing a single motor with two-stage planetary gear reducer provides an output torque which is limited to the output torque of the motor, and a larger output torque requires replacement with a more powerful motor. As annual production of open-pit mines increases, stable and reliable operation of power shovels are more and more valued. For a power shovel, the stability of its hoisting system is crucial to its stable operation. The existing reducers used as hoisting drives in power shovels are all associated with a number of limitations and cannot adapt themselves to the number of actually active motors. Therefore, they are approaching the limit of their ability to meet the ever-growing demand from the production sector. Additionally, the existing reducers are not able to quickly remove debris from and lubricate tooth surfaces of the transmission gears in an automated manner during operation and thus tend to require high maintenance costs after a certain period of use. SUMMARY OF THE INVENTION The problem sought to be solved by the present invention is that the existing reducers used as hoisting drives in power shovels are all associated with a number of limitations and cannot adapt themselves to the number of actually active motors. Therefore, they are approaching the limit of their ability to meet the ever-growing demand from the production sector. Moreover, they are not able to quickly remove debris from and lubricate tooth surfaces of the transmission gears in an automated manner during operation and thus tend to require high maintenance costs after a certain period of use. The above problem is solved by a reducer with balanced output of a very large torque from a plurality of motors proposed in the present invention, which includes a first motor shaft, a second motor shaft, a third motor shaft and a fourth motor shaft, which are each drivingly connected to the plurality of motors. An upper left vertically positioned transmission gear and a lower left vertically positioned transmission gear which are mutually driven are disposed in a top-down orientation each between the first motor shaft and the second motor shaft. An upper right vertically positioned transmission gear and a lower right vertically positioned transmission gear which are mutually driven are disposed in a top-down orientation each between the third motor shaft and the fourth motor shaft. The upper left vertically positioned transmission gear and the upper right vertically positioned transmission gear are drivingly connected to each other by a first horizontally positioned transmission shaft. The lower left vertica