Telescopic Boom Layout Using One Actuator and Dual Return Systems
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Solution Overview
Problem
Telescopic booms with more than four extending elements require an additional hydraulic jack, leading to increased maintenance needs and vulnerability due to the necessity of a dedicated hydraulic control circuit.
Innovation Solution
A telescopic boom design using a single double-acting oleodynamic actuator operating between the terminal and first extending elements, combined with two synchronized chain or rope return systems, allows for the movement of up to eight extending elements without increasing the size or weight of the return systems, and maintains modularity and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If an additional hydraulic jack is used for telescopic booms with more than four extending elements, then the boom extension capability is improved, but the device complexity and maintenance requirements increase
Solution Approach 1:
The patent applies universality by designing a single hydraulic jack that performs multiple functions: it acts as both the primary actuator for extending elements and the return mechanism for retracting elements. This multi-functional design eliminates the need for separate hydraulic jacks for different functions, thereby reducing device complexity while maintaining the capability to handle telescopic booms with more than four extending elements.
Solution Approach 2:
The patent merges the functions of extension and return mechanisms into a single hydraulic jack system. By combining the actuator and return mechanism into one integrated system, the patent reduces the number of separate hydraulic control circuits needed, thus lowering device complexity and maintenance requirements while preserving extended boom capability.
2Length of moving object
If an additional hydraulic jack is used for telescopic booms with more than four extending elements, then the boom extension capability is improved, but the maintenance requirements and vulnerability increase
Solution Approach 1:
The patent applies universality by designing a single hydraulic jack that performs multiple functions: it acts as both the primary actuator for extending elements and the return mechanism for retracting elements. This multi-functional design eliminates the need for separate hydraulic jacks for different functions, thereby reducing device complexity while maintaining the capability to handle telescopic booms with more than four extending elements.
Solution Approach 2:
The patent extracts the return mechanism function from the traditional separate hydraulic jack configuration and integrates it into the main actuator system. By taking out the return mechanism as a separate component and incorporating it into the single hydraulic jack, the patent reduces the number of vulnerable points in the system while maintaining the ability to retract extending elements.
3Device complexity
If a single actuator is used for multiple extending elements, then the device complexity is reduced, but the actuator stress and component size increase
Solution Approach 1:
The patent applies dynamics by implementing a variable mechanical advantage system through the telescopic arrangement of extending elements. As elements extend or retract, the mechanical advantage changes dynamically, allowing the single actuator to handle varying loads efficiently. This dynamic mechanical advantage distribution reduces peak actuator stress while maintaining the ability to control multiple extending elements.
Solution Approach 2:
The patent segments the extending elements into multiple sections with varying cross-sectional areas, creating a telescopic structure. This segmentation allows the mechanical advantage to be distributed across different element pairs, reducing the stress concentration on the single actuator while maintaining control over the entire extending element assembly.
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
This solution effectively addresses the maintenance and vulnerability issues of telescopic booms by using a single actuator, reducing the stress on components and allowing for interchangeable modules, while maintaining efficient operation and structural validation.
Implementation Method 1
a (single) double-acting oleodynamic actuator operating between the terminal extending element of the second group and the first extending element of the first group
Implementation Method 2
a first chain or rope return system configured to operate the transmission of the relative motion imposed by the oleodynamic actuator to the extending elements of the first group
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A telescopic boom (20) for operating machine, preferably a telehandler (10), which comprises: - a series of extending elements (21,...,26) having cross-section decreasing from an external base extending element (21), configured to be hinged to a supporting frame (11) of the operating machine, up to a last internal extending element (26), to the free end of which an operating head (260) is associated, wherein the series of extending elements (21,...,26) comprises: o a first group of consecutive extending elements (23,..., 26), which begins with a first extending element (23) and ends with said last extending element (26), and o a second group of extending elements (21,22), which begins with the base extending element (21) and ends with a terminal extending element (22) of the second group; - a double-acting oleodynamic actuator (27) operating between the terminal extending element (22) of the second group and the first extending element (23) of the first group and placed externally to the extending elements (21,...,26) of the series of extending elements (21,...,26); - a first chain or rope return system (28) configured to operate the transmission of the relative motion imposed by the actuator (27) to the extending elements (23,...,26) of the first group, in extraction and/or in retraction; and - a second chain or rope return system (29) configured to operate the transmission of the relative motion imposed by the same actuator (27), synchronously, to each extending element (21,22) of the second group, in extraction and/or in retraction.