Telescopic Boom Pin Alignment via Asymmetric Double Pins
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Solution Overview
Problem
Existing telescopic devices of single-cylinder latch type face issues with unbalanced loading torque leading to oil leakage and misalignment of boom pins due to flexural deformation of telescopic booms, making plug-in and pull-out operations difficult.
Innovation Solution
A telescopic device with double boom pin structures symmetrically arranged on both sides of the telescopic boom sections, a boom pin pulling and plugging mechanism, and a transmission mechanism that converts linear motion into rotary motion to align and secure the boom pins, along with hydraulic control valves for controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single telescopic cylinder is used to achieve extension and retraction of telescopic boom sections, then the device complexity is reduced, but unbalanced loading torque occurs leading to oil leakage and seal wear
Solution Approach 1:
The patent applies asymmetry by positioning the boom pin at an offset location rather than at the center of the telescopic boom section. This asymmetric positioning creates a moment arm that generates a balancing moment to counteract the unbalanced loading torque produced by the single telescopic cylinder, thereby preventing oil leakage and seal wear while maintaining device simplicity
Solution Approach 2:
The patent implements a counterweight principle by designing a balancing mechanism that generates an opposing moment to counterbalance the unbalanced loading torque. The offset boom pin positioning and associated linkage create a counteracting force that neutralizes the harmful torque, ensuring reliable cylinder operation without increasing overall device complexity
2Length of moving object
If the telescopic boom has larger flexural deformation, then the telescopic range is increased, but the boom pin hole becomes misaligned with the boom pin making plug-in and pull-out operations difficult
Solution Approach 1:
The patent applies preliminary action by incorporating a boom pin pulling and plugging mechanism that actively guides and aligns the boom pin with its corresponding hole before the actual locking operation. This preliminary alignment action ensures proper positioning even when the telescopic boom experiences flexural deformation, making plug-in and pull-out operations easier while maintaining the ability to achieve large telescopic ranges
Data Source
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AI summary
The present invention relates to a telescopic device of single-cylinder latch type and a crane. The telescopic device of single-cylinder latch type is applied to a telescopic boom system and includes: a telescopic cylinder, for driving telescopic boom sections of the telescopic boom system to execute a telescopic action relative to a basic boom section; double boom pin structures, arranged on both sides of the tails of the telescopic boom sections to lock and unlock the telescopic boom sections; an boom pin pulling and plugging mechanism, arranged on the cylinder barrel of the telescopic cylinder to execute pulling and plugging operations on the double boom pin structures; and a cylinder pin structure and a cylinder pin cylinder, both arranged on the cylinder barrel of the telescopic cylinder and to lock and unlock the cylinder barrel of the telescopic cylinder and the telescopic boom sections. In the present invention, the double boom pin structures are arranged on both sides of the tails of the telescopic boom sections, compared with the existing upper boom pin solution, the double boom pin structures in the present invention are arranged on both sides of the telescopic boom sections, so that the stress is more uniform compared with a structure which is singly arranged on the upper side of a telescopic boom, and the influence of flexural deformation of a telescopic boom on the position of a pin hole and the stress of an boom pin is reduced.