Hoist Motor Torque Control for Rope Tension and Stability
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Solution Overview
Problem
Conventional hoist systems in mining face challenges in precise stopping and stability due to rope elongation and deformation, leading to inefficiencies and reduced safety, especially at deeper shafts, and existing control methods require high mechanical strength and frequent operation of separate systems without effectively managing rope tension.
Innovation Solution
A method and system where a supporting device and hoisting motor cooperate to adjust torque automatically, with a supporting device using connecting rod mechanisms to chair and lock the conveyance, and the hoisting motor adjusts force to a predetermined value between 50% to 80% of the conveyance's dead weight to optimize rope tension and reduce system stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate driving system and cage stabilizing system are used with frequent operation of hoist and hydraulic work station, then the conveyance can be locked and pushed, but the operation efficiency decreases and system cost increases
Solution Approach 1:
The patent combines the driving system and cage stabilizing system into an integrated system where the hoisting motor performs both driving and stabilizing functions. The supporting device works in coordination with the hoisting motor to chair and lock the conveyance, eliminating the need for separate hydraulic work stations and improving operational efficiency while maintaining safety and stability.
Solution Approach 2:
The hoisting motor is designed to perform multiple functions: it not only drives the conveyance up and down but also adjusts hoisting force to support the conveyance weight, chair the conveyance, and lock it in position. This multi-functionality replaces separate specialized systems, reducing complexity and improving efficiency.
2Reliability
If upper and lower locking arms with hydraulic work station are used to fix the conveyance, then the conveyance can be securely locked, but the mechanical strength requirements and system cost increase
Solution Approach 1:
The patent replaces the mechanical hydraulic work station system with an automated control system where the hoisting motor electronically adjusts hoisting force to support the conveyance weight. The supporting device uses connecting rod mechanisms driven by the motor to chair and lock the conveyance, reducing mechanical strength requirements on individual components.
3Device complexity
If conventional controlling methods are used without torque adjustment, then the hoist system operates simply, but the rope deformation remains large and working life decreases
Solution Approach 1:
The patent implements dynamic torque adjustment where the hoisting motor automatically modifies hoisting force based on the conveyance position and weight. The motor adjusts torque to minimize rope deformation during hoisting operations, extending rope working life while maintaining system simplicity through automated control.
Solution Approach 2:
The system dynamically changes the hoisting force parameter during operation. The hoisting motor adjusts torque magnitude based on real-time conditions, optimizing rope tension to reduce deformation and extend working life without requiring complex mechanical modifications.
4Duration of action of stationary object
If the hoisting motor adjusts force to predetermined value, then the rope tension is optimized and working life extended, but the control system complexity increases
Solution Approach 1:
The hoisting motor performs self-adjustment of torque based on pre-programmed control logic. The system automatically monitors conveyance position and weight, then adjusts hoisting force to optimal levels without requiring external intervention or complex additional control hardware, extending rope life while maintaining control simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances operation efficiency, extends the working life of the rope, and ensures safety by simplifying tension control and reducing mechanical stress on the hoisting system, thereby lowering costs and improving stability.
Implementation Method 1
a hoisting motor for hoisting a conveyance... the hoisting force (and correspondingly driving torque) of the hoisting motor is adjusted to a predetermined value
Implementation Method 2
the supporting device comprises at least four groups of connecting rod mechanisms symmetrically arranged relative to a shaft
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A method for controlling a hoist system, wherein, when the conveyance moves downward to the supporting device and then is supported by the supporting device, hosting force of the hoisting motor is adjusted to a predetermined value. It is also provides a hoist system which comprises a hoisting motor for hoisting a conveyance, and a supporting device for supporting the conveyance when the conveyance reaches a predetermined position, for carrying out the above method. The provided method above and the hoist system enable the controlling system and supporting device to cooperate with each other, and the motor torque be adjusted automatically, so that the operation efficiency of the hoist system and the life of the rope are improved and the safety in the hoisting process is ensured.