Excavator Mast Position Detection and Dynamic Rotation Limiting
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Solution Overview
Problem
The operational efficiency of hydraulic excavators is reduced due to interference between the working mechanism and the mast during ground leveling work, as the mast's mounting position affects the revolving range of the upper structure, requiring careful operation to avoid interference and complicating the removal of obstacles.
Innovation Solution
A construction machine equipped with a mast position detecting device and a rotation limiting device that adjusts the revolving range of the upper structure based on the mast's mounting position, preventing interference regardless of the mast's position on the blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mast is installed upright on the left end portion or right end portion of the blade to satisfy laser detection conditions, then the laser receiver can detect the blade position accurately, but the upper revolving structure must carefully be revolved to avoid interference with the mast, reducing operational efficiency
Solution Approach 1:
The invention makes the revolving range limit dynamic by detecting the mast mounting position and automatically adjusting the rotation limiting device. When the mast is mounted on the left end, the right revolving range is limited; when mounted on the right end, the left revolving range is limited. This dynamic adjustment eliminates interference between the working mechanism and mast while maintaining accurate blade position detection.
2Adaptability or versatility
If the mast is installed on the blade to enable ground leveling work, then the blade position can be detected for ground leveling control, but the position at which the working mechanism interferes with the mast varies depending on mounting position, complicating obstacle removal operations
Solution Approach 1:
The invention uses a mast position detecting device to provide feedback on the mast mounting position to the control system. Based on this feedback, the rotation limiting device automatically adjusts the revolving range limits. This feedback mechanism simplifies operation by eliminating the need for the operator to manually calculate or remember the safe revolving range based on mast position.
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 configuration enhances operational efficiency by allowing the upper revolving structure to revolve freely without interfering with the mast, simplifying the removal of obstacles and improving ground leveling operations.
Implementation Method 1
The ground leveling system includes a position detector such as a prism mounted on the blade of a hydraulic excavator through a mast and a controller controlling the operation of the blade. The height position of the blade is continuously detected by transmitting and receiving laser beams between a total station installed in a working site and the position detector.
Data Source
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AI summary
A hydraulic excavator (1) includes: a blade (20) rotatably mounted on a lower traveling body (2) and extending in the left-and-right direction; a mast (24) mounted on either a left end portion (20C) or a right end portion (20E) of the blade (20) and extending in the vertical direction; and a prism (25) provided on an upper end side of the mast (24) to detect the position of the blade (20). The hydraulic excavator (1) is also provided with a left proximity sensor (27) and a right proximity sensor (28) detecting whether the mast (24) is mounted either on the left end portion (20C) or the right end portion (20E) of the blade (20), and a rotation limiting device (29) limiting the revolving range for allowing an upper revolving structure (4) to revolve, depending on the mounting position of the mast (24) detected by the left proximity sensor (27) and the right proximity sensor (28).