Reach Forklift Sensor Edge Detection for Mast Positioning
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Solution Overview
Problem
Existing reach trucks require significant effort to adjust sensor systems for precise control of the mast holder's approach to end positions, necessitating multiple sensors and complex parameter settings, which is inefficient and costly.
Innovation Solution
A reach truck design featuring spaced switching edges on the base plate and a downward-pointing sensor that generates a switching signal when passing these edges, allowing for easy adjustment based on battery box thickness, with software control to manage speed reduction near stops, utilizing a single sensor for minimal equipment and adjustment effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors and complex parameter settings are used to precisely control the mast holder's approach to end positions, then the sensing precision and control accuracy are improved, but the device complexity and adjustment effort increase significantly
Solution Approach 1:
The base plate is segmented with multiple switching edges (first, second, third, and fourth switching edges) that are spatially separated. Each switching edge can be independently activated by the mast holder at different positions along its travel path, enabling precise position detection without requiring multiple sensors. This segmentation of the detection function into spatially distributed edges resolves the contradiction by providing accurate position sensing through a single sensor system.
Solution Approach 2:
The invention transitions from a temporal sensing approach (multiple sensors detecting position at different times) to a spatial sensing approach (single sensor detecting position across multiple spatial locations via switching edges). By embedding the switching edges in the base plate and using a single sensor on the mast holder, the system uses the spatial dimension of the mast holder's travel path to achieve precise position detection, thereby reducing device complexity while maintaining measurement precision.
2Manufacturing precision
If multiple sensors are installed to detect end positions accurately, then the control accuracy is improved, but the adjustment effort and equipment cost increase
Solution Approach 1:
The single sensor on the mast holder serves multiple functions by detecting signals from multiple switching edges (first, second, third, and fourth edges) at different positions. This universal sensor system can detect the mast holder's position at multiple critical points along its travel path, providing accurate end position control without requiring multiple specialized sensors. The multi-functionality of the single sensor reduces both equipment cost and adjustment effort while maintaining manufacturing precision.
Solution Approach 2:
Instead of using multiple physical sensors at different positions, the invention creates virtual copies of the sensing function through multiple switching edges in the base plate. A single physical sensor detects signals from these distributed switching edges, effectively copying the sensing capability to multiple locations without duplicating the sensor hardware. This approach maintains end position control accuracy while significantly reducing adjustment effort and equipment complexity.
3Productivity
If the mast holder approaches end stops at high speed, then the productivity is improved, but the risk of load instability and equipment damage increases
Solution Approach 1:
The switching edges are positioned to detect the mast holder's approach to end positions before it actually reaches the mechanical stops. When the sensor detects a switching edge, it generates a signal that triggers speed reduction in advance, allowing the mast holder to decelerate gradually rather than abruptly. This preliminary detection and speed reduction action prevents load instability and equipment damage while maintaining high productivity during the majority of the mast holder's travel path.
Solution Approach 2:
The sensor system provides continuous feedback about the mast holder's position by detecting when it passes over switching edges in the base plate. This feedback signal is used by the control system to automatically adjust the feed speed, reducing it as the mast holder approaches end positions. The feedback mechanism ensures load stability near endpoints while allowing high-speed operation during normal travel, resolving the contradiction between productivity and reliability.
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 solution enables efficient and low-effort sensing of the mast holder's approach to end positions, reducing the risk of load instability and equipment damage by minimizing sensor technology and adjustment requirements, while maintaining precise control over the mast holder's movement.
Implementation Method 1
a downward-pointing sensor is provided on the mast holder or on the mast, which sensor generates a switching signal when it runs over a switching edge
Data Source
Figure 1~4
AI summary
The base plate (10) has a leading edge (16) by which the travelling sensor (18) in a mounting plate (20) signals the suitability for a maximum speed until it travels (22) to another edge (14) at which it signals a speed reduction. Further sensors positioned in further positions (26) react to further edges of the blanked aperture.