Sprayer Ultrasonic Sensor Swivel Arm Mechanism
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Solution Overview
Problem
Agricultural sprayer ultrasonic sensors' measurement accuracy is compromised by spray mist, especially with double flat jet nozzles, and existing solutions require complex external power actuators and sequential switching during transport and working position changes.
Innovation Solution
A distance measuring device is positioned on a long arm that protrudes perpendicularly from the distribution linkage, actuated by the folding movement of the boom segments, eliminating spray mist interference and allowing automatic position transition without external power actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ultrasonic sensors are arranged directly on the distribution linkage, then the device complexity is reduced, but the measurement precision deteriorates due to spray mist interference
Solution Approach 1:
The sensor is moved from the distribution linkage to an extended arm that protrudes forward in the direction of travel. This spatial relocation places the sensor in a dimension (forward of the spray jet) where it is no longer affected by spray mist, thereby resolving the contradiction between simple mounting and accurate measurement.
2Measurement precision
If the distance measuring device is arranged on a long arm protruding from the distribution linkage, then the measurement precision improves by avoiding spray mist, but the device complexity increases due to the additional arm mechanism
Solution Approach 1:
The arm mechanism is integrated with the existing distribution linkage folding mechanism. The arm is pivotally connected to the linkage so that it automatically moves between working and storage positions as the linkage folds, eliminating the need for separate actuators and control systems.
Solution Approach 2:
The arm serves multiple functions: it positions the sensor away from spray interference during operation, and it automatically stores the sensor in a retracted position during transport. This multi-functionality reduces overall system complexity despite the added arm structure.
3Ease of operation
If external power actuators are used to move the sensor arrangement between transport and working positions, then the ease of operation improves, but the device complexity and energy requirements increase
Solution Approach 1:
The sensor arrangement moves itself between positions by being mechanically coupled to the distribution linkage. As the linkage folds or extends, the arm automatically pivots to move the sensor between storage and working positions without requiring external power or control systems.
Solution Approach 2:
The sensor is pre-positioned on the arm in such a way that its movement is passively driven by the linkage's folding motion. This preliminary arrangement ensures the sensor is always in the correct position relative to the spray boom without requiring active control during operation or transport.
4Measurement precision
If the arm length is increased to position the sensor farther from the spray jet, then the measurement precision improves, but the device complexity and structural requirements increase
Solution Approach 1:
The arm is designed as a pivotal, movable structure rather than a fixed rigid extension. This dynamic design allows the arm to achieve the necessary sensor positioning distance while accommodating the folding motion of the distribution linkage, reducing structural complexity compared to a fixed long extension.
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
Improved measurement accuracy and reduced complexity in operating the sprayer, with enhanced control quality and reduced reaction speed requirements for the control device, as the arm moves into optimal positions mechanically during folding.
Implementation Method 1
Through the use of distance sensors, which are attached to part of the segments, in conjunction with a control and regulation device, the constant adaptation to the target surface contour can be adjusted.
Data Source
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AI summary
A swivel arm (10) for a ground distance sensor (9) of an agricultural field sprayer is proposed, which automatically swivels the distance sensor (9) out of the spray mist area of the application nozzles (21) of the distribution boom (2). When the individual distribution segments (33, 3', 4, 4') of the distribution boom (2) are folded, the swivel arm (10) with distance sensor (9) integrates into the installation space of the folded distribution boom (2) and is protected against damage.