Jet Member Pivoting Control for Uniform Concrete Removal
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Solution Overview
Problem
Existing devices for removing weakened concrete from structures like roads and bridges using high-pressure jets suffer from non-uniform treatment, especially in turning zones where the attack angle changes and speed adjustments are made, leading to irregular surfaces.
Innovation Solution
A device with coordinated control of drive means to maintain a substantially constant speed of the jet's impact point over the layer, using sensors to continuously measure and adjust for changes in speed, angle, and distance, ensuring uniform treatment by compensating for operational variations and surface inclinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the jet member is pivoted with constant angular speed in turning zones, then the attack angle changes to reach under reinforcement bars, but the treatment becomes non-uniform and the surface becomes irregular
Solution Approach 1:
The system dynamically adjusts the pivoting speed of the jet member based on real-time feedback from sensors. The control unit modifies the angular speed during pivoting operations to maintain constant linear speed of the impact point, ensuring uniform treatment even when changing attack angles to reach under reinforcement bars.
Solution Approach 2:
Sensors continuously measure the actual speed of the impact point and the attack angle during pivoting. This feedback information is fed to the control unit, which adjusts the pivoting speed in real-time to compensate for speed variations, thereby maintaining treatment uniformity throughout the turning zones.
2Speed
If the carriage speed is increased in turning zones to compensate for pivoting, then the impact point speed varies, but the treatment remains non-uniform
Solution Approach 1:
The system uses sensors to continuously monitor the impact point speed and feeds this information back to the control unit. The control unit then adjusts the carriage speed dynamically to compensate for speed variations during pivoting, ensuring the impact point maintains substantially constant speed across the layer throughout the entire treatment cycle.
Solution Approach 2:
The carriage speed is made dynamic rather than constant. The system continuously adjusts the carriage speed based on real-time conditions during pivoting operations, coordinating the speed changes with the jet member pivoting to maintain uniform impact point speed and ensure consistent treatment quality.
3Ease of operation
If the jet member is pivoted to change attack angle, then the jet can reach under reinforcement bars for cleaner treatment, but the speed and direction changes cause non-uniform treatment in turning zones
Solution Approach 1:
The control system uses feedback from sensors measuring attack angle and impact point speed to dynamically adjust pivoting speed. This ensures that even when the jet member pivots to achieve large attack angles for reaching under reinforcement bars, the treatment remains uniform by compensating for speed variations in real-time.
Solution Approach 2:
The system changes the pivoting speed parameter dynamically during operation based on the required attack angle. When large attack angles are needed to reach under reinforcement bars, the system adjusts the pivoting speed to maintain constant impact point speed, thereby preserving treatment uniformity while achieving the necessary penetration capability.
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 approach ensures a uniform and smooth treatment surface by maintaining constant speed and adjusting for changing conditions, improving the quality of material removal in both rectilinear and turning zones.
Implementation Method 1
a jet member (6) for directing a high pressure jet of liquid against the material layer (12) so as to execute the material removing treatment
Implementation Method 2
a jet member (6) for directing a high pressure jet of liquid against the material layer (12)
Data Source
AI summary
A device for moving a jet member (6) having a nozzle has a carriage (4) movable in a substantially rectilinear path and provided with a base portion to which the jet member is pivotably connected. A first drive member (9) is arranged for moving the carriage for moving the nozzle of the jet member in the rectilinear path over a layer to be treated by the jet, and a second drive member (10) is arranged for pivoting the jet member with respect to the base portion for changing the attack angle of the jet upon the layer. A control arrangement (21) is situated to coordinate the control of the first and second drive members for moving the impact point of the jet on the layer with a substantially constant speed over the layer.