Double-Chamber Boom Lock Actuator for Simpler Telescoping
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Solution Overview
Problem
Conventional telescopic booms for mobile cranes face challenges in efficiently locking and unlocking boom segments during length adjustment, requiring complex mechanisms and additional drives, which complicates the design and increases operational complexity.
Innovation Solution
A hydraulic actuator with a double chamber cylinder, piston rods, and restoring springs allows for simple actuation in two directions, utilizing a slotted actuating link to adjust locking and driver bolts between locking and release positions, eliminating the need for separate drives and simplifying the design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional hydraulic cylinder with separate drives is used for locking and unlocking boom segments, then the locking and unlocking function is achieved, but the device complexity increases and the design becomes more complicated
Solution Approach 1:
The patent combines two separate hydraulic drives (one for locking bolt and one for driver bolt) into a single double-chamber hydraulic cylinder. The first chamber controls the locking bolt via first piston rod, while the second chamber controls the driver bolt via second piston rod. This merging of functions into one compact actuator reduces overall device complexity while maintaining reliable locking and unlocking operations.
Solution Approach 2:
The double-chamber hydraulic cylinder serves multiple functions simultaneously: it acts as both a locking mechanism (through the locking bolt) and a telescoping mechanism (through the driver bolt). This multi-functional design eliminates the need for separate dedicated drives for each function, thereby simplifying the overall system design while ensuring reliable operation.
2Ease of operation
If separate drives are used for locking bolt and driver bolt, then precise control is achieved, but the operational complexity increases
Solution Approach 1:
By integrating two control functions into a single double-chamber hydraulic cylinder, the system maintains precise control over both locking and driver bolts while reducing operational complexity. Each chamber can be independently controlled, allowing precise operation, but the unified structure simplifies the overall control architecture and reduces the number of separate control systems needed.
3Volume of moving object
If a compact design is implemented, then the space efficiency is improved, but the mechanism complexity may increase
Solution Approach 1:
The double-chamber hydraulic cylinder merges two separate actuator functions into one compact unit, significantly reducing the overall space required in the locking head region. This consolidated design achieves compactness without increasing mechanical complexity, as the two chambers operate independently within the single cylinder structure.
Solution Approach 2:
The patent employs a nested arrangement where the first and second piston rods are arranged in different chambers of the same cylinder, with components disposed in the longitudinal extent of each other. This nesting approach maximizes space efficiency by utilizing the longitudinal space within the single cylinder housing, achieving a compact design without adding mechanical complexity.
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 enables a compact, uncomplicated design for telescopic boom systems by allowing efficient locking and unlocking of boom segments with reduced mechanical complexity and operational ease, enhancing the performance of mobile cranes.
Implementation Method 1
a first restoring spring (100) configured for restoring said first piston rod (102) to a main position thereof wherein said first piston rod (102) is in a pushed-in position in said first cylinder chamber (124)
Implementation Method 2
a second restoring spring (101) configured for restoring said second piston rod (108) into a main position thereof wherein said second piston rod (108) is in an extended position
Data Source
AI summary
A hydraulic actuator for a mobile crane, in particular for a locking device of a telescoping device. The hydraulic actuator has a double chamber cylinder with a first cylinder chamber and a second cylinder chamber oriented in an opposite direction to the first cylinder chamber, a first piston rod for the first cylinder chamber, and a second piston rod for the second cylinder chamber. A first restoring spring restores the first piston rod to its main position and a second restoring spring restores the second piston rod to its main position. The main position of the first piston rod is its pushed-in position and the main position of the second piston rod is its extended position.