Winch Overwinding Prevention and Load Spin Decoupling Mechanism
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Solution Overview
Problem
Existing winches lack effective mechanisms to prevent overwinding, load spin, and rope tension management, which can lead to rope breakage and load damage.
Innovation Solution
The winch incorporates an overwinding prevention unit with a trigger and activator to prevent further raising of the load, a load spin prevention device using ball bearings to decouple the load from the rope, and a rope tension control unit with triggers and resilient members to manage rope tension and prevent unwinding when tension falls below a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the winch winds the rope to raise the load continuously, then the productivity is improved, but the rope may break due to overwinding or excessive tension
Solution Approach 1:
The overwinding prevention unit is activated in advance by the OPTA before the rope reaches its maximum safe winding capacity. The OPTA moves to the second position proactively when the load approaches the safe limit, triggering the OP trigger to stop the winch motor before dangerous conditions occur, preventing rope breakage while maximizing productive operation time
Solution Approach 2:
The OPTA acts as a feedback mechanism that continuously monitors the load position relative to the safe operating range. When the load reaches a predetermined position, the OPTA automatically triggers the OP trigger to stop the winch, creating a closed-loop control system that prevents overwinding without requiring constant manual monitoring, thus maintaining both productivity and rope safety
2Ease of operation
If the load is allowed to rotate freely during raising, then the ease of operation is improved, but the load may spin uncontrollably causing damage
Solution Approach 1:
The load spin prevention device introduces an intermediary mechanism between the rope and the load. This device allows the load to be raised vertically while preventing rotational movement that could cause damage. The intermediary structure translates the rotational motion of the rope into pure vertical motion of the load, maintaining ease of operation while eliminating the harmful spinning effect
Solution Approach 2:
The load spin prevention device segments the motion control into two independent functions: vertical raising motion controlled by the winch motor, and rotational motion controlled by the spin prevention mechanism. This segmentation allows each function to be optimized independently - the winch provides easy vertical control while the spin prevention device eliminates unwanted rotation, resolving the contradiction between operational ease and damage prevention
3Ease of operation
If the winch allows rope to go slack during operation, then the ease of operation is improved, but the rope may unwind or become damaged
Solution Approach 1:
The rope tension control unit uses a feedback mechanism where the resilient member continuously monitors rope tension. When tension falls below the threshold (indicating slack), the RTC trigger activator automatically activates the RTC trigger to stop the winch motor, preventing the rope from going completely slack and unwinding. This feedback control maintains rope integrity while allowing normal operational flexibility
Solution Approach 2:
The resilient member acts as a beforehand cushioning mechanism that detects tension drops before they cause dangerous slack conditions. By triggering the winch to stop when tension approaches the unsafe threshold, the system prevents the rope from becoming completely slack and unwinding, maintaining rope integrity while allowing natural tension variations during normal operation
4Reliability
If the winch structure is made complex to include all safety features, then the reliability is improved, but the device complexity increases
Solution Approach 1:
Multiple safety functions are merged into integrated units: the overwinding prevention unit combines the OPTA, OP trigger, and associated mechanisms into a single compact assembly; similarly, the rope tension control unit combines the resilient member, RTC trigger activator, and RTC trigger into one integrated unit. This merging reduces the overall device complexity while maintaining comprehensive safety coverage through functional integration
Solution Approach 2:
The OPTA serves multiple functions: it acts as a position sensor, a trigger mechanism, and a safety limit switch all in one component. Similarly, the resilient member serves as both a tension sensor and a mechanical indicator for the RTC trigger activator. This multi-functionality reduces the number of separate components needed, improving reliability through fewer potential failure points while minimizing device complexity
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
These features prevent overwinding and load spin, ensuring the rope does not exceed a safe tension, thereby preventing damage to the load and rope, and allow for stable operation and charging of the load's battery via circular electrical contacts.
Implementation Method 1
a rope tension control, RTC, unit for determining a tension experienced by the rope (3); wherein the RTC unit comprises: an RTC trigger for triggering preventing the winch from further winding or unwinding the rope (3); and an RTC trigger activator, RTCTA, moveable between a first RTCTA position and a second RTCTA position relative to the RTC trigger; wherein the RTC trigger is in a deactivated state when the RTCTA is in the first RTCTA position, and wherein the RTC trigger is in an activated state, to trigger preventing the winch from further winding or unwinding the rope (3), when the RTCTA is in the second RTCTA position; and wherein the RTCTA is configured to move into the second RTCTA position when the tension experienced by the rope (3) falls below a (predetermined) threshold tension
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
We describe a winch comprising one or more of an overwinding prevention unit, a load spin prevention device, a power supply board comprising substantially circular electrical contacts, a rope tension control unit, and a system comprising a said winch and a load, attached to the winch, having a load battery chargeable via the winch.