Insulated Aerial Work Platform Automatic Radius Limiting
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Solution Overview
Problem
Existing vehicle-mounted insulated aerial work platforms lack an effective radius limiting function, relying on operator experience for safe boom operation, which can lead to instability and risk of toppling or boom damage due to the absence of real-time monitoring and control systems.
Innovation Solution
An automatic radius limiting method using sensors and an electrical control mechanism, including a lower boom inclination angle detecting sensor, lower boom length detecting sensor, upper boom derricking detecting sensor, and upper boom length detecting sensor, calculates the actual working radius and compares it to a predetermined maximum, outputting signals to control the boom's operation to prevent exceeding the safe radius.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end section arm is made of insulated material to meet insulation requirements, then the insulation performance is improved, but the installation of electronic sensors for real-time monitoring is prevented
Solution Approach 1:
The patent introduces an intermediary calculation method that computes the working radius based on measurements from the lower boom portion and relative angle between booms, rather than directly measuring the upper boom. This intermediary approach allows insulation to be maintained while achieving monitoring functionality through mathematical derivation.
Solution Approach 2:
The patent replaces direct mechanical/electronic sensing on the insulated upper boom with a computational system that uses data from the lower boom sensors and angle measurements to calculate the working radius, substituting physical sensing with mathematical computation.
2Device complexity
If manual control based on operator experience is used to avoid obstacles, then the system complexity is reduced, but the safety and stability are compromised
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the working radius through sensor data and angle measurements, compares it against safe operating limits, and provides real-time feedback to prevent unsafe operations, thereby improving reliability without excessive complexity.
Solution Approach 2:
The system performs self-monitoring and self-protection by automatically calculating the working radius and comparing it against predetermined safe limits, enabling the vehicle to protect itself without requiring constant operator judgment or intervention.
3Measurement precision
If hydraulic pressure and flow rate monitoring is implemented to detect boom position, then the measurement capability is improved, but the data throughput requirement and system complexity increase
Solution Approach 1:
The patent extracts only the essential measurement data needed for radius calculation (lower boom length and relative angle) rather than monitoring all hydraulic parameters, simplifying the data processing requirements while maintaining sufficient measurement precision for safety control.
Data Source
AI summary
A vehicle mounted with the insulated aerial work platform includes a work platform radius limiting device which includes the lower boom inclination angle detecting sensor, and further includes the lower boom length detecting sensor, the upper boom derricking detecting sensor and the upper boom length detecting sensor, which each include an distance measuring rope and an insulated distance measuring rope retraction-and-extension measuring mechanism. The extension lengths of all of the insulated distance measuring ropes are detected in real time to calculate the actual working radius of the insulated work platform. When the actual working radius is less than the predetermined maximum working radius, the operator is allowed to perform the operational action of increasing the working radius. When the actual working radius is greater than or equal to the predetermined maximum working radius, the operator is limited from performing any the operational action related to increasing the working radius.