Combi-angling plate for mobile crane jib extension
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Solution Overview
Problem
Current mobile crane systems face complexity and inefficiency in angling the main jib extension relative to the main jib, requiring additional force points and auxiliary cylinders, especially when dealing with long, narrow jib systems, and often necessitate working above the crane's upper edge.
Innovation Solution
The integration of a combi-angling plate with a sliding and guiding plate, driven by a hydraulic cylinder, allows for adjustable angling without additional force points on the main jib head or extension, enabling angling on the ground and compensating for deformation, thus simplifying the process and eliminating the need for auxiliary cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional angling methods with additional force points and auxiliary cylinders are used, then the angling function can be achieved, but the device complexity increases and the ease of operation deteriorates
Solution Approach 1:
The patent combines the angling function with the existing luffing cylinder by integrating an angling plate mechanism into the luffing cylinder assembly. The angling plate is mechanically coupled to the luffing cylinder rod, allowing a single cylinder to perform both luffing and angling functions. This merging eliminates the need for separate auxiliary cylinders and force points, directly reducing device complexity while maintaining operational capability.
Solution Approach 2:
The luffing cylinder is designed to serve dual purposes: traditional luffing operation and angling of the main jib extension. The angling plate mechanism enables the luffing cylinder to generate both luffing force and angling moment through its mechanical coupling arrangement. This multi-functionality reduces the total number of hydraulic cylinders and force application points required in the system.
2Adaptability or versatility
If auxiliary cylinders and additional force points are added to achieve angling, then the angling function is enabled, but the number of components increases
Solution Approach 1:
The angling function is merged into the existing luffing cylinder assembly through the angling plate mechanism. The angling plate connects to the luffing cylinder rod and the main jib extension, creating a mechanical linkage that allows the single luffing cylinder to produce both luffing and angling motions. This integration eliminates the need for separate auxiliary cylinders, reducing the total component count while maintaining full angling capability.
3Ease of operation
If working above the crane's upper edge is required for angling, then the angling operation can be performed, but the ease of operation deteriorates and safety risks increase
Solution Approach 1:
The angling operation is automated through the mechanical coupling of the angling plate to the luffing cylinder. The system performs the angling function automatically through hydraulic actuation of the existing luffing cylinder, eliminating the need for manual intervention above the crane's upper edge. This self-service mechanism reduces both operational difficulty and safety risks by removing personnel from hazardous elevated positions.
4Adaptability or versatility
If a fixed-length angling plate is used, then the structure is simpler, but the adaptability to different terrain conditions deteriorates
Solution Approach 1:
The angling plate is designed with adjustable length capability through telescopic sections or extendable elements. This dynamic structure allows the angling plate length to be modified according to different terrain conditions and operational requirements. The adjustable length enables the system to adapt to various ground levels and slopes, improving terrain adaptability while maintaining reasonable structural complexity through standardized mechanical adjustment mechanisms.
Data Source
AI summary
A mobile crane having a main jib that is mounted thereupon for luffing and that can be oriented by means of a luffing cylinder, and a main jib extension which is detachably connected to a main jib head of the main jib by upper and lower bolts, it being possible to angle the main jib extension about a luffing axis relative to the main jib proceeding from a base position following release of the upper or lower bolts and using an angle drive, the angle drive engaging with a foot of the main jib extension, a maximum angling angle being delimited by an adjustable angling plate, and the angling plate engaging with the foot of the main jib extension and the main jib head. The angle drive is a component of an angling plate in the form of a combi-angling plate.