Pivotable Protective Hood Speed Control for Work Tools
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Solution Overview
Problem
Existing work apparatuses, such as cutoff machines, lack versatility in adjusting rotational speed based on the position of the protective hood, which affects the cutting process and safety features like braking, especially when the tool is damaged.
Innovation Solution
A work apparatus with a control unit that detects the position of a pivotable protective hood and adjusts the rotational speed of the drive motor or fuel supply to control the work tool's speed, activating or deactivating the brake assembly and gear unit accordingly, allowing for adaptive speed control and safety measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the protective hood is opened further for lateral cuts or cuts from below, then the accessibility for different cutting operations is improved, but the rotational speed of the work tool must be reduced
Solution Approach 1:
The protective hood is made pivotable about the rotational axis of the work tool, allowing it to dynamically change position between covering the top side (for high speed) and opening further (for lateral/bottom cuts). This dynamic adjustment enables the system to adapt to different cutting operations while maintaining appropriate rotational speeds for each operation type.
Solution Approach 2:
A detection unit detects the position of the protective hood and provides feedback to a control unit, which automatically adjusts the rotational speed of the work tool based on the detected hood position. This closed-loop feedback system ensures that the rotational speed is optimally adapted to the current operating condition without manual intervention.
2Adaptability or versatility
If the protective hood is made pivotable to accommodate different cutting positions, then the versatility of the work apparatus is improved, but the complexity of the control system increases
Solution Approach 1:
The detection unit automatically detects the protective hood position and triggers the appropriate control actions without requiring manual input from the operator. The system serves itself by autonomously adjusting rotational speed and activating safety features based on the detected hood position, thereby reducing the perceived complexity for the user while maintaining high versatility.
Solution Approach 2:
The control unit is designed to handle multiple functions: detecting hood position, adjusting rotational speed, and activating safety features such as the brake assembly. By consolidating these functions into a single multi-functional control unit, the system achieves high versatility without proportionally increasing overall system complexity.
3Reliability
If the rotational speed is reduced when the protective hood is partially open, then the safety is improved, but the productivity during such operations decreases
Solution Approach 1:
The rotational speed parameter is dynamically changed based on the protective hood position. When the hood is partially open, the control unit automatically reduces the rotational speed to a safer level. This parameter adjustment ensures safety during partial hood opening while maintaining optimal productivity for each operating condition, rather than using a fixed conservative speed for all operations.
4Reliability
If the brake assembly is activated when the protective hood is opened beyond a certain position, then the safety in case of work tool damage is improved, but the response time for braking increases due to detection and control processes
Solution Approach 1:
The detection unit continuously monitors the protective hood position during operation, so that when the hood is opened beyond the predetermined position (indicating possible work tool damage), the control unit can immediately activate the brake assembly without delay. This continuous preliminary detection enables rapid response to dangerous conditions, minimizing the loss of time while maintaining high safety standards.
Data Source
AI summary
A work apparatus has a drive motor and a work tool driven in a rotating manner by the drive motor. The work tool is at least partially covered by a protective hood which is mounted pivotably about the rotational axis of the work tool. A control unit is provided for controlling at least one component of the work apparatus. The work apparatus has a detection unit for detecting at least one position of the protective hood. The control unit is configured for controlling the at least one component of the work apparatus depending on the detected position of the protective hood. In a method for operating a work apparatus, the detection unit detects at least one position of the protective hood and supplies the information to the control unit. The control unit activates the at least one component depending on the detected position of the protective hood.