Telescopic Boom Length Sensing With Shorter Internal Cables
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Solution Overview
Problem
The existing lifting devices with double cylinder telescopic control mechanisms face challenges due to the long length measuring cables being prone to damage from foreign objects, which affects the reliability of the torque limiter's length signal transmission and increases the volume and weight of the length sensors.
Innovation Solution
The lifting device incorporates a telescopic boom with length sensors where each sensor measures the extension length of one section relative to an adjacent section, with the first length sensor and second length sensor cables positioned inside the boom, reducing the total cable length and allowing for a more compact and protected length measuring device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length measuring cables are positioned outside the telescopic boom, then the installation and maintenance is easier, but the cables are prone to damage from foreign objects and the sensor volume and weight increase
Solution Approach 1:
The patent applies nesting by positioning the length measuring cables inside the telescopic boom structure. The first length measuring cable is arranged within the basic section, and the second length measuring cable is arranged within the telescopic section, effectively nesting the measurement system within the existing structural envelope. This protects the cables from external damage while utilizing the internal space of the boom.
2Measurement precision
If the first length sensor measures the total extension length of the telescopic boom, then the measurement coverage is complete, but the cable length increases and the sensor volume and weight increase
Solution Approach 1:
The patent divides the measurement function into two separate length sensors instead of using one long cable. The first length sensor measures the extension of the basic section, and the second length sensor measures the extension of the telescopic section. This segmentation reduces the cable length for each sensor, thereby reducing the volume and weight of each sensor while maintaining complete measurement coverage through coordinated operation of both sensors.
Solution Approach 2:
The patent transitions from a single-dimension measurement approach (one long cable measuring total extension) to a multi-dimensional approach (two separate cables measuring section extensions independently). By measuring each section's extension separately and combining the data, the system achieves complete measurement coverage with shorter cables, reducing sensor size and weight.
Data Source
AI summary
The present disclosure provides a lifting device comprising: a telescopic boom, comprising a basic section, at least one primary telescopic section and at least one secondary telescopic section; a telescopic control mechanism, comprising a primary telescopic drive mechanism that controls synchronous telescoping of the at least one primary telescopic section and a secondary telescopic drive mechanism that controls synchronous telescoping of the at least one secondary telescopic section; a torque limiter, comprising a first length sensor and a second length sensor, wherein a first sensor body and a telescopic end of a first length measuring cable of the first length sensor are respectively connected to tails of adjacent two section in the basic section and the at least one primary telescopic section; and a second sensor body and a telescopic end of a second length measuring cable of the second length sensor are respectively connected to tails of adjacent two section in the primary telescopic section adjacent to the at least one secondary telescopic section and the at least one secondary telescopic section. The lifting device of the present disclosure can reduce the length of the length measuring cable of a length sensor and thus reduce its volume and weight.