Displaceable Locking Unit for Telescopic Crane Boom
Solution Overview
Problem
The existing telescopic boom locking systems in mobile cranes restrict the full extension and retraction of telescopic parts due to the dependency between the telescoping cylinder and locking unit, resulting in an unnecessary overlap of front parts and a loss of overall boom length, which affects the crane's load capacity and maneuverability.
Innovation Solution
A longitudinally displaceable locking unit decouples the position of the telescoping cylinder and locking unit, allowing for independent movement and positioning, enabling the locking unit to reach telescopic parts without extending the telescoping cylinder, thus optimizing the telescoping travel and reducing the overall weight of the boom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the telescoping cylinder extends to lock the telescopic part, then the locking function is achieved, but the telescoping travel is reduced and front telescopic parts cannot be extended as far as rear ones
Solution Approach 1:
The locking system is segmented into two independent components: the telescoping cylinder and the locking unit. The locking unit can be independently displaced along the telescoping cylinder via a displacement device, separating the telescoping function from the locking function. This allows the telescoping cylinder to extend the full stroke while the locking unit independently positions itself to engage the locking point.
Solution Approach 2:
The locking unit is made dynamically displaceable along the telescoping cylinder through a displacement device. This dynamic positioning capability allows the locking unit to adapt its position independently of the telescoping cylinder's extension state, enabling full telescoping travel while maintaining reliable locking engagement at any telescopic part position.
2Length of moving object
If the telescoping cylinder extends fully to achieve maximum telescoping travel, then the boom length is maximized, but the locking unit cannot reach the telescopic part for locking
Solution Approach 1:
The system separates the telescoping cylinder's extension function from the locking unit's engagement function. The locking unit can be independently displaced along the telescoping cylinder to reach the telescopic part regardless of the cylinder's extension position, ensuring both maximum boom length and reliable locking engagement are achieved.
Solution Approach 2:
The displacement device acts as an intermediary mechanism between the telescoping cylinder and the locking unit. It enables the locking unit to independently position itself along the telescoping cylinder to engage the locking point, decoupling the locking engagement capability from the telescoping cylinder's extension state.
3Reliability
If additional telescoping cylinder stroke is allocated for locking unit movement, then locking is enabled, but the total boom length is reduced due to increased overlap of front telescopic parts
Solution Approach 1:
The locking system is divided into independent components: the telescoping cylinder provides the full stroke for boom extension, while the locking unit with its independent displacement device provides the locking capability. This segmentation eliminates the need to allocate additional cylinder stroke for locking unit movement, preventing reduction in overall boom length.
Solution Approach 2:
The dynamically displaceable locking unit can independently position itself along the telescoping cylinder without requiring additional telescoping cylinder stroke. This dynamic independence allows full utilization of the telescoping cylinder's total stroke for boom extension while maintaining locking capability at any position.
4Length of moving object
If the telescoping cylinder and locking unit are decoupled to allow independent positioning, then telescoping travel is maximized, but the device complexity increases
Solution Approach 1:
The locking system is segmented into the telescoping cylinder and the independently displaceable locking unit. While this segmentation enables maximum telescoping travel, it does increase device complexity by adding the displacement device and independent positioning mechanism for the locking unit.
Data Source
Figure 1
Figure 2
AI summary
The locking system has a locking unit (21) which is slidably arranged in a longitudinal manner in a telescopic cylinder (10). A locking is manufactured between the telescopic cylinder and the telescopic components (1,2,3,4) for ejecting and retracting the telescopic components by the locking unit.