Truck Crane Boom-Winch Control for Regular Wire Payout
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Solution Overview
Problem
Existing truck crane boom devices require manual operation for safe extension and retraction, which is inefficient and not adaptable to different boom types, leading to potential safety risks and operational limitations.
Innovation Solution
A controller that calculates and maintains a predetermined target payout length of the wire based on boom type, derricking angle, and other specified values, ensuring safe and automatic extension and retraction of the boom, using actuators and sensors to manage the boom's motion and winch operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual operation is used for boom extension and retraction, then operational flexibility is maintained, but safety risks increase and operational efficiency decreases
Solution Approach 1:
The control device automatically controls the boom drive unit and winch drive unit to perform boom extension and retraction operations without manual intervention. The system self-regulates wire payout length based on boom angle and position, eliminating the need for manual operation while improving both safety and operational efficiency
Solution Approach 2:
The control device uses sensors to detect boom angle and position, then automatically adjusts wire payout length based on this feedback. This closed-loop control ensures safe operation by preventing wire damage and irregular winding while maintaining high operational efficiency through automated decision-making
2Measurement precision
If a fixed control device is designed for each boom type, then control precision is maintained, but device complexity and adaptability worsen
Solution Approach 1:
The control device is designed with universal functionality to handle multiple boom types. It automatically identifies boom characteristics and adjusts control parameters accordingly, enabling a single control device to precisely control different boom configurations without requiring type-specific designs
Solution Approach 2:
The control device dynamically changes control parameters based on detected boom type and configuration. By adjusting parameters such as wire payout length calculations and winch speed based on real-time boom characteristics, the system maintains high control precision across different boom types without requiring separate control devices for each type
3Productivity
If automatic control is implemented, then operational efficiency improves, but device complexity increases
Solution Approach 1:
The control system is segmented into distinct functional modules: boom angle detection, position detection, control parameter calculation, and actuator control. This modular segmentation manages complexity by organizing functions into separate, manageable components while maintaining automated operational efficiency
Solution Approach 2:
The control device acts as an intermediary between sensors and actuators, processing sensor data and generating appropriate control signals. This intermediary function simplifies the overall system architecture by centralizing the intelligence required for automatic operation, reducing the complexity burden on individual components
Data Source
AI summary
A controller calculates a theoretical payout length X1(θ) of a wire in a posture in which a hook block is raised, a theoretical payout length X2(θ) of the wire in a posture in which the hook block is lying, dX1(θ)/dt, and dX2(θ)/dt, using a length L of the boom, A and B (first specified values) indicating coordinates of a hook hardware, a length K (second specified value) being a sum of a length of the hook block and a length of a hook hardware, and a derricking angle θ of the boom. The controller makes the boom stand and lie at a constant speed of F=dθ/dt, and makes a winch drive at a wind-up speed of J×{dX1(θ)/dt+dX2(θ)/dt}/2 taking J×{X1(θ)+X2(θ)}/2 as a target value.