Mobile Crane Boom Attachment Using Hoist Cable and Roller
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Solution Overview
Problem
The existing methods for attaching and removing additional devices to and from the main jib of a mobile crane require the use of an auxiliary crane, leading to increased costs, time consumption, and safety risks due to the need for precise alignment and additional personnel.
Innovation Solution
A method involving a preassembled additional device with a lattice/pipe design, where partial pieces are raised and rotated into inclined positions using a hoist cable and rollers to align and bolt onto the main boom, allowing for attachment and removal without an auxiliary crane, utilizing displacement devices and spacer rods for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an auxiliary crane is used to attach the additional device, then the attachment can be performed with standard equipment, but the costs increase and additional personnel are required
Solution Approach 1:
The patent extracts the auxiliary crane from the attachment process and replaces it with the mobile crane's own hoist cable and roller system. The hoist cable is guided over a roller that is part of the mobile crane's existing structure, eliminating the need for separate auxiliary equipment and personnel.
Solution Approach 2:
The mobile crane's hoist cable and roller system, originally designed for lifting the main boom, is made multi-functional by using it to also lift and position the additional device during attachment. This universal application eliminates the need for dedicated auxiliary cranes.
2Measurement precision
If an auxiliary crane is used to guide the additional device, then the device can be positioned, but pinpoint precision is difficult to achieve and safety risks increase
Solution Approach 1:
The patent introduces a roller as an intermediary element between the hoist cable and the additional device. The roller provides a stable, controlled pivot point that enables precise positioning and alignment of the additional device with the main boom, achieving pinpoint precision that would be difficult with direct cable attachment.
Solution Approach 2:
The roller is pre-positioned on the mobile crane's structure before the attachment process begins. This preliminary setup creates a predetermined, stable rotation axis that guides the additional device into precise alignment with the main boom, ensuring both precision and safety before the actual attachment occurs.
3Productivity
If the additional device is attached piece by piece or as a preassembled unit with auxiliary crane, then the attachment can be completed, but the time expenditure is relatively high
Solution Approach 1:
The patent employs dynamic positioning where the additional device is lifted and rotated into place using the mobile crane's hoist cable guided over a roller. This dynamic method allows the device to be swung into precise alignment and attached quickly, significantly reducing installation time compared to static positioning methods or piece-by-piece 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 method simplifies and safer attachment and removal of additional devices to mobile cranes, reducing time and costs by eliminating the need for auxiliary cranes and improving precision and safety during installation and disassembly processes.
Implementation Method 1
A partial piece, at the end of the additional device facing the mobile crane, is raised into an inclined position while being rotated about an upper pivot point
Implementation Method 2
the additional device is pulled into a horizontal position using a hoist cable fastened on the end of a second partial piece raised in an inclined position, at the end of the preassembled additional device facing away from the mobile crane, and guided over a roller
Data Source
AI summary
A method and a device for attaching and removing an additional device having individual elements to and from a main boom of a mobile crane using no auxiliary crane is provided. In the method, a partial piece of the additional device having partial pieces is raised into an inclined position while being rotated about an upper pivot point, and a head of the main boom is bolted to a lower end of the inclined end of the partial piece of the additional device facing the mobile crane so as to be able to rotate. Using a hoist cable, all partial pieces are raised in alignment with respect to each other and the main boom, and are bolted to each other in this position and to the main boom. A displacement device for carrying out the method is also provided.