Crane Rotating Frame Standardization for Model Variation
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Solution Overview
Problem
The existing crane manufacturing process is costly and inefficient due to the need for multiple rotating frames and complex mounting structures for different lifting capacities and winch configurations, leading to high design, manufacturing, and storage costs, as well as low productivity and inventory control issues.
Innovation Solution
A crane design where multiple models with different lifting capacities are grouped into classes, sharing a common rotating frame based on the largest capacity model, with standardized mounting structures for boom raising and lowering apparatuses and winches, reducing the number of required mounting structures and enabling easier model changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple dedicated rotating frames are prepared for different lifting capacities, then each model can have optimized performance, but design costs, manufacturing costs, and storage costs increase significantly
Solution Approach 1:
The patent applies universality by designing a single rotating frame that can serve multiple lifting capacity models (50t, 55t, 65t, 80t) through standardized mounting structures. The rotating frame is equipped with multiple types of mounting structures that can accommodate different winch configurations and boom raising/lowering apparatus, allowing one frame design to fulfill multiple model requirements without needing separate dedicated frames for each lifting capacity.
Solution Approach 2:
The patent applies dynamics by making the mounting structures adjustable and reconfigurable. The rotating frame includes multiple mounting positions and adjustable mounting structures that can be dynamically configured to suit different model requirements. This allows the same rotating frame to be adapted for different lifting capacities by changing the configuration of mounting structures rather than requiring completely different frame designs.
2Adaptability or versatility
If multiple types of mounting structures are provided for different winch configurations, then all winch arrangements can be supported, but the complexity of the rotating frame increases
Solution Approach 1:
The patent applies segmentation by dividing the mounting structures into modular, standardized components. Instead of designing completely different mounting structures for each winch configuration, the rotating frame uses segmented standardized mounting structures that can be independently configured. Each mounting structure type corresponds to specific winch arrangements, but they are all based on the same standardized interface and mounting mechanism, reducing overall complexity.
Solution Approach 2:
The patent applies parameter changes by using standardized mounting structures with adjustable parameters such as mounting positions, orientations, and configurations. The same basic mounting structure design can be adapted to different winch configurations by changing parameters like the number of mounting points, their locations, and angular orientations, rather than requiring fundamentally different structural designs for each configuration.
3Reliability
If dedicated rotating frames are used for each model, then model-specific requirements are met, but productivity and assembly efficiency decrease
Solution Approach 1:
The patent applies universality by creating a single rotating frame design that can be used across multiple models with different lifting capacities. The standardized mounting structures allow the same rotating frame to accommodate different winch configurations and boom raising/lowering apparatus, enabling assembly operations to be performed using the same base component rather than requiring model-specific frames, thereby improving productivity.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the rotating frame with multiple types of standardized mounting structures during the design phase. These mounting structures are prepared in advance to accommodate various winch configurations and apparatus types, so that during assembly, workers can directly install the required components without needing to modify the rotating frame or select from completely different frame designs, thus improving assembly efficiency.
4Adaptability or versatility
If multiple rotating frame types are maintained in inventory, then all model variations can be supported, but inventory control becomes difficult and storage costs increase
Solution Approach 1:
The patent applies universality by designing a single rotating frame that can serve multiple model variations through standardized mounting structures. This eliminates the need to maintain separate inventory of different rotating frame types for different models (50t, 55t, 65t, 80t), as one universal rotating frame design can accommodate all these variations by configuring the appropriate mounting structures, thereby reducing inventory quantity and storage requirements.
Data Source
AI summary
[PROBLEMS] To provide a rotating frame of an upper rotating body such that total productivity can be improved, the cost can be reduced, and model change can be facilitated.[MEANS FOR SOLVING PROBLEMS] Many models having different lifting capacities are divided into a plurality of classes each including a plurality of models. A rotating frame 17 is determined on the basis of the model having the largest lifting capacity in each class. An upper rotating body is constructed using the rotating frame 17 as the base. In addition, each of winches 5 to 7 is mounted on the rotating frame by using a mounting structure standardized in the same class. On the other hand, left and right deck frames 18 and 19 are divided into sections on which different pieces of equipment are mounted, and the sections are separately attached to the rotating frame 17.