Grinding Machine Safety Controller with Vacuum Sensor
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Solution Overview
Problem
Grinding machines pose safety hazards due to unattended operation, potential for spontaneous start-up after a power outage, and the generation of fine airborne particulate without adequate exhaust vacuum systems.
Innovation Solution
A grinding machine configuration that includes a support pedestal, a drive motor, an abrasive wheel, an exhaust vacuum with a vacuum/air flow sensor, a motor drive with safe torque off features, a safety controller coupled with an E-stop, a foot pedal switch, and a 480-volt AC 3-phase electrical power supply, which together provide redundant safety features and ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the grinding machine is equipped with a latch style on/off switch to allow unattended operation, then operational convenience is improved, but safety hazards increase due to potential spontaneous start-up after power outage
Solution Approach 1:
The patent replaces the traditional mechanical latch switch with an electronic control system that includes a microprocessor-based controller, electronic interlocks, and automated start-stop mechanisms. This electronic system provides more reliable safety control while maintaining operational convenience through automated functions.
Solution Approach 2:
The patent implements feedback mechanisms through sensors that monitor machine state, power supply conditions, and operational parameters. The controller receives real-time feedback and automatically adjusts operation to prevent spontaneous start-up while allowing safe unattended operation under controlled conditions.
2Object-affected harmful factors
If the exhaust vacuum device is operated during grinding operation, then airborne particulate removal is improved, but device complexity increases
Solution Approach 1:
The patent combines the exhaust vacuum system with the existing motor control and safety interlock systems. The vacuum system is integrated into the overall machine control architecture, sharing power supply, control circuits, and monitoring functions, thereby reducing overall device complexity while maintaining effective particulate removal.
Solution Approach 2:
The exhaust vacuum system is designed to serve multiple functions: particulate removal, cooling the grinding zone, and providing a barrier to harmful contaminants. This multi-functionality reduces the need for separate systems and simplifies the overall device architecture.
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
The configuration effectively prevents operator injury by ensuring the grinding machine is safely shut down and cannot spontaneously start, while also optimizing speed for material removal and ensuring proper ventilation to manage airborne particulate.
Implementation Method 1
an exhaust vacuum coupled to the support pedestal proximate the abrasive wheel, the exhaust vacuum including a vacuum/air flow sensor
Data Source
Figure 1
Figure 2
AI summary
A grinding machine including a support pedestal that supports a drive motor that supports an abrasive wheel rotatably coupled to the drive motor; a motor drive operatively coupled to the drive motor; a safety controller operatively coupled with the drive motor and motor drive; an E-stop operatively coupled to the safety controller; a foot pedal switch operatively coupled to the safety controller; and a 480 volt alternating current 3 phase electrical power supply electrically coupled to the drive motor.