Hydraulic Carriage Position Detection Without Cabling
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Solution Overview
Problem
Existing devices for high-pressure jet treatment of material layers, such as concrete, face operational disturbances due to cabling issues and sensor malfunctions, particularly in harsh environments like construction sites, where cables are prone to damage and interference.
Innovation Solution
The device employs mechanical resistance members and hydraulic pressure sensing to detect extreme positions, eliminating the need for sensors on the carriage and reducing cabling-related issues by using a control unit to manage the carriage's movement based on hydraulic flow parameters, ensuring robust position detection and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are arranged on the carriage to detect extreme positions, then position detection capability is improved, but the reliability deteriorates due to cabling damage and interference in harsh environments
Solution Approach 1:
The patent removes the sensor from the carriage and extracts the detection function to the hydraulic system. The extreme position detection is achieved by sensing hydraulic pressure changes in the hydraulic circuit, eliminating the need for electrical cabling on the carriage and its associated reliability issues.
Solution Approach 2:
The patent introduces hydraulic pressure as an intermediary to transmit position information. Instead of directly sensing mechanical position with electrical sensors, the system uses hydraulic pressure as a mediator that reflects the carriage position, which can be detected without exposing sensors to harsh environments.
2Device complexity
If mechanical resistance members are introduced to detect extreme positions through hydraulic flow changes, then the device complexity is reduced, but the measurement precision may be affected
Solution Approach 1:
The patent makes the hydraulic system self-serving for dual purposes: it both drives the carriage and detects its extreme positions. The hydraulic pressure changes that occur during normal operation are utilized to detect position, eliminating the need for separate detection mechanisms and reducing overall device complexity.
Solution Approach 2:
The hydraulic system is given multiple functions: it serves both as the actuation system for moving the carriage and as the detection system for identifying extreme positions. This multi-functionality reduces the number of separate components needed in the system.
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 enhances the robustness of the device, reduces operational disturbances, and allows for reliable detection of extreme positions without external sensors or cabling, improving the reliability and ease of operation in challenging environments.
Implementation Method 1
a parameter of the hydraulic liquid, the magnitude of which is dependent upon said flow
Implementation Method 2
hydraulic circuit of the hydraulic drive arrangement
Data Source
Figure 1
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Figure 5~8
AI summary
A device for moving a jet member on a carriage (6) between two selectable extreme positions along a guide (5) has means for detecting that the carriage has reached a selectable extreme position, said means comprising members (24, 25) adapted to form a mechanical resistance against continued movement of the carriage so as to influence the flow of hydraulic liquid in an hydraulic circuit (27) of a hydraulic drive arrangement for moving the carriage. Members (31 ) are arranged to sense a parameter of the hydraulic liquid, the magnitude of which is depending upon the flow of hydraulic liquid in the hydraulic circuit, and send information about the magnitude of this parameter to a control unit (14) adapted to control the turning of the carriage on the basis of this information.