GNSS-Steered Line Marking Cart With Feedback Path Control
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Solution Overview
Problem
Existing line marking devices are either fully automated and costly, requiring complex setup and programming, or manually operated and time-consuming, with difficulties in handling obstacles and surveying fields efficiently.
Innovation Solution
A line marking device with a steerable wheel, GNSS receiver, and marking unit, allowing autonomous steering and navigation along predetermined paths, combined with a manual handle and optional motorized drive, enabling easy handling and cost-effective operation for both marking and surveying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fully automated line marking device is used, then marking precision and path accuracy are improved, but device complexity and setup time increase
Solution Approach 1:
The device uses GNSS receiver and comparator to automatically determine its own position and compare it with the predetermined pattern, enabling self-navigation without complex external control systems. The steerable wheel autonomously steers the cart based on position feedback, making the system self-sufficient in path following.
Solution Approach 2:
The patent replaces complex mechanical control systems with electronic and satellite-based navigation (GNSS). Instead of using intricate mechanical guides or laser beams, the system uses satellite signals and electronic comparators to achieve precise path following with simpler hardware.
2Measurement precision
If a fully automated line marking device is used, then marking precision is improved, but setup time and programming effort increase
Solution Approach 1:
The predetermined pattern is stored in advance in the memory unit, and the GNSS receiver continuously compares current position with this pre-stored pattern. This preliminary preparation of path data eliminates the need for time-consuming setup and programming during actual operation.
3Device complexity
If a manually operated line marking device is used, then device complexity is reduced, but handling efficiency and surveying capability worsen
Solution Approach 1:
The device serves multiple functions: it can autonomously follow predetermined paths using GNSS, be manually pushed by users, and perform both line marking and field surveying. This multi-functionality maintains simplicity while significantly improving handling efficiency and versatility.
4Device complexity
If manual pushing and steering is used, then device cost is reduced, but time consumption and difficulty in maintaining straight lines increase
Solution Approach 1:
The comparator continuously compares the detected GNSS position with the predetermined pattern and provides feedback to the steerable wheel, which automatically adjusts steering to maintain the correct path. This feedback mechanism eliminates time-consuming manual correction while keeping the device simple and affordable.
5Measurement precision
If guides like laser beam or chord are used for manual operation, then path accuracy is improved, but setup time increases
Solution Approach 1:
The patent replaces physical guides like laser beams or chords with satellite-based GNSS navigation. This substitution eliminates the need for time-consuming setup of physical guides while maintaining high path accuracy through electronic position comparison with predetermined patterns.
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
Facilitates efficient and accurate line marking and surveying with reduced setup time and cost, allowing for easy navigation around obstacles and precise path following without the need for extensive user guidance.
Implementation Method 1
The line marking devices comprises further a GNSS (global navigation satellite system) receiver or a reflector for a robotic total station mounted on the cart
Implementation Method 2
The line marking device also comprises at least one marking unit, preferably a spray nozzle, for depositing a material to mark a line
Data Source
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AI summary
Line marking device (1) comprising a cart (2) with at least one steerable wheel (3) and at least two moving elements (4, 5). The steerable wheel (3) is rotatable around its axle (13). The steerable wheel (3) is further pivotable such that the cart (2) is steered in a direction. The line marking device (1) comprises further a GNSS receiver (7) or a robotic total station mounted on the cart (2). The line marking device (1) also comprises at least one spray nozzle (8) for marking a line. A spray nozzle (8) is mounted on the cart. The nozzle (8) is directed towards a ground below the line marking device (1). The device (1) comprises an interface mounted on the cart for a comparator to compare a detected location by the GNSS receiver (7) to a predetermined pattern. The cart (2) may comprise a motor (14), which is adapted to pivot the steerable wheel (3) towards an intended direction of movement.