Molded Product Suction Control Above a Negative-Pressure Lower Limit
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Solution Overview
Problem
Existing apparatuses for taking out molded products face issues with setting a user-set lower limit value for negative pressure control, leading to potential falls due to insufficient suction, as the negative pressure does not increase immediately after the pressure valve is opened, and the user-set lower limit value may be too low.
Innovation Solution
An apparatus with a negative pressure control portion that determines a pressure valve resumption time period to maintain the inflection point above the user-set lower limit value, using equations to calculate this period based on detected negative pressure variations, ensuring easy and smooth setting of the user-set lower limit value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If on-off control is performed using a user-set lower limit value to reduce air consumption, then the amount of consumed air is reduced, but the molded product may fall due to insufficient negative pressure when the pressure valve is opened
Solution Approach 1:
The control portion determines and sets the pressure valve resumption time period Tv in advance based on the relationship between the inflection point and the user-set lower limit value. This preliminary determination ensures that when the pressure valve is opened, the negative pressure will not fall below the lower limit value, preventing molded product fall while enabling on-off control for air consumption reduction.
Solution Approach 2:
The control portion uses pressure detection to monitor the negative pressure in real-time and adjusts the pressure valve operation accordingly. By detecting when the negative pressure reaches the inflection point and comparing it with the user-set lower limit value, the system provides feedback to optimize the resumption timing, ensuring reliable suction while minimizing air consumption.
2Loss of energy
If a low user-set lower limit value is used to maximize air savings, then air consumption is minimized, but the negative pressure becomes insufficient to maintain suction after the pressure valve opens
Solution Approach 1:
The control portion calculates the pressure valve resumption time period Tv in advance by analyzing the relationship between the inflection point (where negative pressure stops decreasing and starts increasing) and the user-set lower limit value. This preliminary timing determination ensures that the pressure valve resumes operation at the optimal moment, maintaining negative pressure above the lower limit value while maximizing air savings.
3Loss of energy
If the pressure valve is opened immediately when the negative pressure reaches the lower limit value, then air consumption is reduced, but the inflection point causes the negative pressure to drop below the desired level
Solution Approach 1:
The control portion determines the pressure valve resumption time period Tv in advance by analyzing the inflection point characteristics of the negative pressure curve. This preliminary timing setup allows the system to automatically resume the pressure valve at the optimal moment without requiring complex real-time adjustments, making the lower limit value setting simple and effective for the user.
Solution Approach 2:
The system continuously monitors the negative pressure and uses feedback from pressure detection to determine when the inflection point is reached. This feedback mechanism allows the control portion to automatically adjust the resumption timing based on actual pressure conditions, simplifying the user's task of setting an appropriate lower limit value.
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
Facilitates easy and smooth setting of the user-set lower limit value, reducing the risk of molded product falls by ensuring the negative pressure remains above the desired threshold during suctioning operations.
Implementation Method 1
a vacuum generating device 33 connected to the suction nozzle 31 via an air flow path 32 to apply a vacuum pressure to the suction nozzle 31
Implementation Method 2
a pressure detector 35 provided in the air flow path 32 to detect a negative pressure in the air flow path 32
Data Source
AI summary
There is provided an apparatus for taking out a molded product that facilitates setting of a user-set lower limit value while maintaining on-off control. A negative pressure control portion includes a determining portion for determining a pressure valve resumption time period that is used to resume a suctioning operation such that an inflection point does not become lower than a user-set lower limit value. The negative pressure control portion continuously performs an off operation, which is performed to keep a pressure valve closed until the pressure valve resumption time period elapses after the suctioning operation is stopped, and an on operation, which is performed to open the pressure valve and keep the pressure valve open until a negative pressure reaches a stable value or an upper limit set value, until suctioning of a molded product is canceled.