Forestry Winch Pulley Rope Termination Mechanism
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Solution Overview
Problem
Existing forestry winch systems lack a reliable and robust mechanism for timely and safe termination of rope winding, leading to rope entanglement, damage, and increased maintenance costs.
Innovation Solution
A pulley mechanism with a linearly movable pushing element and a two-part safety-guiding assembly, incorporating a sensor or switch to detect the end of the rope and trigger termination of winding, ensuring reliable and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no termination mechanism is installed, then the winch structure remains simple, but the rope and drive parts get damaged due to untimely termination of winding
Solution Approach 1:
The pushing element is positioned in advance at the rope guide to detect the end of the rope before damage occurs. The sensor is pre-configured to monitor the position of the pushing element, enabling the control unit to terminate winding proactively rather than reactively, preventing rope and drive part damage.
Solution Approach 2:
The system uses the rope itself to activate the termination mechanism. When the rope ends, it naturally fails to push the pushing element, which automatically triggers the sensor and control unit to stop winding. The system self-regulates without requiring external intervention or complex additional components.
2Reliability
If a termination mechanism is installed, then winding termination becomes reliable, but the device complexity increases
Solution Approach 1:
The pushing element serves multiple functions: it acts as a mechanical guide for the rope, a sensor trigger when the rope is present, and an automatic stop signal when the rope ends. The sensor and control unit are integrated into the existing winch system, allowing one component to perform multiple roles and reducing overall system complexity.
Solution Approach 2:
The patent replaces complex mechanical termination mechanisms with a sensor-based detection system. Instead of using intricate mechanical switches or levers, the system uses a simple sensor to detect the position of the pushing element, converting a mechanical problem into an electronic sensing problem that is easier to implement and maintain.
3Productivity
If manual monitoring is used to terminate winding, then the mechanism remains simple, but work must be suspended and components damaged due to untimely termination
Solution Approach 1:
The sensor continuously monitors the position of the pushing element and provides feedback to the control unit. When the rope ends and the pushing element moves to a predetermined position, the sensor signals the control unit to terminate winding automatically, eliminating the need for manual monitoring and enabling continuous operation without downtime.
Solution Approach 2:
The winch system automatically monitors its own operational status through the sensor and pushing element mechanism. The system self-terminates winding when the rope ends without requiring operator intervention, maintaining continuous productivity while automating the termination function.
4Reliability
If the pushing element is freely movable, then the mechanism is simple, but the pushing element may rotate and fail to reliably trigger the sensor
Solution Approach 1:
The groove in the pushing element has an asymmetric cross-sectional shape that matches the asymmetric shape of the rod in the rod guide. This asymmetric pairing prevents rotation of the pushing element while maintaining a simple guiding structure, ensuring reliable sensor triggering without adding complex rotational constraints.
Solution Approach 2:
The rod guide acts as an intermediary between the freely movable pushing element and the sensor. The guide constrains the pushing element's movement to a linear path without requiring complex mechanical linkages, simply mediating the motion to ensure reliable sensor activation while maintaining system 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
The solution effectively prevents rope entanglement and damage, reduces maintenance costs, and ensures safer and more efficient operation of forestry winches by providing a reliable mechanism for terminating rope winding.
Implementation Method 1
the spring installed between the pushing element and far end of the orifice, said spring ensuring return movement of the pushing element into its initial position
Implementation Method 2
the sensor or the switch arranged to terminate pulling of the load once the pushing element contacts the element installed in the groove on the upper side of the orifice
Data Source
Figure 1a~1b
Figure 2
AI summary
A pulley (1) for a forestry winch, the pulley being provided with a mechanism for terminating winding of a rope, wherein said pulley (1) comprises: - a housing (11) to which a guide (12) for a pulling rope is mounted, said guide (12) being movable in an axis (13a) of a drive sheave (13) of the pulley (1), - the guide (12) is provided with an orifice (12a) having an opening along which the rope runs, - a pushing element (14) having a smaller opening than an end part of the pulling rope, so that the end part of the pulling rope can hit the pushing element (14) arranged to be moved towards the orifice (12a) of the rope guide (12), and - a switch or a sensor (17) arranged to terminate winding of the rope and consequently load pulling upon contact of the end part of the rope and the pushing element (14).