Electric Working Machine External Stop Signal Control
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Solution Overview
Problem
Conventional electric working machines cannot stop operation when external factors unrelated to their state occur, leading to defective products in manufacturing processes.
Innovation Solution
A working machine management system that includes an electric working machine and a managing device, where the managing device can send a motor prohibit signal to stop the electric working machine's operation based on external conditions, such as unsuitable processing upstream, allowing immediate cessation of defective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the electric working machine operates autonomously without external monitoring, then the operation simplicity is maintained, but the production of defective products increases due to inability to respond to external factors
Solution Approach 1:
A managing device is introduced as an intermediary between multiple electric working machines and the production process. This managing device monitors operation status, receives stop commands from external devices, and coordinates shutdown signals to multiple machines, thereby improving product quality without requiring each individual machine to have complex internal monitoring systems
Solution Approach 2:
The system implements feedback mechanisms where operation status information from electric working machines is transmitted to the managing device, which then sends stop commands back to the machines when defective products are detected or external stop signals are received, creating a closed-loop control system that responds to production quality issues
2Productivity
If the electric working machine stops operation immediately when external stop factors occur, then the productivity loss is reduced, but the response time requirement increases
Solution Approach 1:
The managing device is pre-configured with stop command reception capabilities and shutdown coordination functions. When external devices or the managing device itself detects conditions requiring shutdown (such as defective product detection or emergency situations), the pre-established communication channels and control logic enable immediate transmission of stop commands to all relevant electric working machines, achieving rapid response without requiring complex real-time decision-making at each machine
3Manufacturing precision
If multiple electric working machines are managed independently, then the operational autonomy of each machine is maintained, but the coordination efficiency decreases leading to continued defective production
Solution Approach 1:
The system merges the control functions of multiple electric working machines under a single managing device. This managing device receives operation status information from all machines and distributes stop commands uniformly when needed, creating a coordinated system that maintains the operational autonomy of individual machines while achieving centralized control for consistent production quality and efficient shutdown coordination
Data Source
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AI summary
An electric working machine (11,111,211) is provided. The electric working machine (11,111,211) comprises a motor (21), an electric-power supply unit (13), a control unit (23,123), and a signal processing unit (23,126). The signal processing unit (23,126) performs a signal control process for sending and receiving a signal to and from the signal processing unit (23,126) and an external device, and receives at least a stop-command signal (Sb) from the external device. The control unit (23,123) stops the electric power supply to the motor (21) in a case where the stop-command signal (Sb) is received at the signal processing unit (23,126) when the electric power supply from the electric-power supply unit (13) to the motor (21) is in process.