Pump Apparatus Door Interlock to Prevent High-Pressure Liquid Ejection
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Solution Overview
Problem
In machine tools, there is a risk of high-pressure liquid being accidentally ejected from nozzles due to abnormal operation of the high-pressure shift valve, leading to potential safety hazards.
Innovation Solution
A pump apparatus with a door sensor and control device that only supplies power to the motor when the door is closed, monitoring the rotation speed of the pump and stopping it if it exceeds a safety threshold to prevent unintended ejection of high-pressure liquid, thereby ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump is operated continuously regardless of nozzle injection status, then the pump maintains readiness for immediate injection, but there is a risk of accidental high-pressure liquid ejection due to abnormal valve operation
Solution Approach 1:
The system performs preliminary safety verification by checking door closure status before allowing pump operation. The door sensor detects door closure in advance, and the control device uses this information to enable or disable motor power supply, preventing accidental ejection before it can occur.
Solution Approach 2:
The door sensor acts as an intermediary between the physical door state and the pump operation control. It provides safety verification by detecting door closure and transmitting this information to the control device, which then decides whether to supply power to the motor, creating a safety barrier against accidental ejection.
2Object-affected harmful factors
If the door sensor and control device are added to monitor and control pump operation, then safety against accidental ejection is improved, but the device complexity increases
Solution Approach 1:
The door sensor automatically detects door closure status and provides this information to the control device without requiring manual intervention. The control device autonomously decides whether to supply power to the motor based on the sensor signal, making the safety system self-regulating and minimizing the need for additional complex control logic.
3Object-affected harmful factors
If the motor is only powered when the door is closed, then safety is improved by preventing accidental ejection, but the response time for emergency injection is reduced
Solution Approach 1:
The system applies preliminary anti-action by preventing pump operation when the door is open, which could lead to dangerous liquid ejection. The door sensor continuously monitors door status, and the control device blocks motor power supply when the door is open, creating a safety barrier that prevents harmful actions before they can occur.
Data Source
AI summary
Provided is a pump apparatus capable of suppressing an unintentional ejection of a high-pressure liquid from a nozzle. A pump apparatus including: an injection chamber having a door; a nozzle arranged in the injection chamber; a pump connected to the nozzle for discharging liquid; a motor for driving the pump; a door sensor for detecting that the door is closed; and a control device capable of communicating with the door sensor, the control device having a motor rotation unit for supplying driving power to the motor only when the door sensor detects that the door is closed.