Mobile Crane Remote Terminal Using GNSS Boom-Tip Alignment
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Solution Overview
Problem
Existing remote operation terminals for mobile cranes face challenges in maintaining accurate alignment of the manipulation tool's direction with the work apparatus, especially in environments with obstacles or large distances, leading to potential misoperations.
Innovation Solution
Incorporating a GNSS receiver to calculate the position of the boom's distal end and the remote operation terminal, allowing the control section to set an operation direction reference along the line connecting these positions, and displaying an image to align the operation direction with the boom's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a laser beam or reference signal is used to align the coordinate system of the manipulation tool with the work apparatus, then the operation direction coincides with the working direction, but the receiving section may fail to receive the reference signal in environments with obstacles or large distances
Solution Approach 1:
The patent introduces a GNSS satellite as an intermediary to transmit position information between the remote operation terminal and the mobile crane. Instead of using a direct laser beam or reference signal that requires line-of-sight, the GNSS satellite acts as a mediator that can transmit signals through obstacles and over long distances, ensuring reliable position data reception while maintaining ease of operation.
2Measurement precision
If the receiving section is positioned to receive the reference signal directly, then the coordinate systems can be aligned, but the alignment fails when the receiving section is considerably separated from the remote operation apparatus
Solution Approach 1:
The patent makes the position measurement system universal by using GNSS receivers that can obtain position information from satellites regardless of the relative position between the remote operation terminal and the mobile crane. This multi-functional approach allows the system to maintain measurement precision whether the receiver is close to or far from the remote operation apparatus, and whether direct line-of-sight is available or not.
3Reliability
If the operator constantly considers the relative positional relationship with the work apparatus, then accurate operation can be maintained, but the operation becomes complex and not simple
Solution Approach 1:
The patent implements a self-service mechanism where the system automatically calculates and adjusts the operation direction reference based on the relative positions of the remote operation terminal and the mobile crane obtained from GNSS receivers. The control section automatically performs the coordinate transformation and alignment calculations, eliminating the need for the operator to manually consider positional relationships, thereby maintaining reliability while simplifying operation.
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 setup ensures the operator can easily and accurately manipulate the crane, preventing misoperations by aligning the manipulation tool's direction with the boom's movement, even in complex environments.
Implementation Method 1
a GNSS receiver that receives a range signal from a GNSS satellite and calculates a present position of the remote operation terminal
Data Source
AI summary
The invention addresses the problem of providing a remote operation terminal that prevents erroneous operation while remotely operating a mobile crane and that can easily and simply remotely operate the mobile crane, and a work vehicle comprising the remote operation terminal. A remote operation terminal comprises: a terminal-side GNSS receiver; a suspended load movement manipulation tool; and a terminal-side control device. The terminal-side control device acquires the current position of a boom tip from the crane control device and the current position of the remote operation terminal from the terminal-side GNSS receiver of the remote operation terminal, and sets the reference for the operation direction on a line L connecting the current position of the boom tip and the current position of the remote operation terminal.