Nozzle Flow Rate Adjustment for Component Pickup Detection
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Solution Overview
Problem
In component mounting devices using nozzles with small diameters, the pressure difference between normal pickup and leak conditions is reduced, making it difficult to determine whether a component is picked up based on air state detection.
Innovation Solution
The component mounting device includes a nozzle flow path with a pressure sensor and a flow rate changing section that adjusts the negative pressure flow rate according to the nozzle's suction port size, enhancing the pressure difference between pickup and leak states for accurate determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a nozzle with a small diameter suction port is used, then the device can handle smaller components with higher precision, but the pressure difference between normal pickup and leak conditions decreases, making detection difficult
Solution Approach 1:
The patent changes the flow rate parameter of the negative pressure according to the suction port size. For small-diameter nozzles, a smaller flow rate is supplied to enhance the pressure difference between pickup and leak states, making detection feasible despite the small port size
Solution Approach 2:
The system dynamically adjusts the negative pressure flow rate based on the detected nozzle size. The flow rate changing section modifies the pressure supply in real-time according to the suction port diameter, optimizing detection conditions for each nozzle type
2Measurement precision
If a nozzle with a large diameter suction port is used, then the pressure difference between pickup and leak is more apparent, but the device cannot handle smaller components with the same precision
Solution Approach 1:
The patent applies parameter changes by adjusting the negative pressure flow rate to match the nozzle size. For large-diameter nozzles, a larger flow rate is supplied to maintain appropriate pressure differential for detection, while for small-diameter nozzles, a reduced flow rate is used to enhance detectability
Solution Approach 2:
The system applies different pressure supply conditions to different nozzle types based on their local characteristics (suction port diameter). Each nozzle receives a customized flow rate appropriate to its size, optimizing both detection accuracy and component handling capability
3Ease of operation
If a fixed negative pressure flow rate is used for all nozzle sizes, then the system is simpler to operate, but accurate pickup determination cannot be achieved with small-diameter nozzles
Solution Approach 1:
The system performs self-adjustment by automatically detecting the nozzle size and autonomously changing the negative pressure flow rate accordingly. This eliminates the need for manual intervention while ensuring reliable pickup determination for each nozzle type
Solution Approach 2:
The system uses feedback from nozzle size detection to control the flow rate changing section. The detected nozzle information feeds back to the control system, which then adjusts the pressure supply to optimize pickup determination for the specific nozzle being used
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
This approach allows for appropriate determination of component pickup even with small-diameter nozzles by creating a noticeable pressure difference, ensuring reliable component mounting.
Implementation Method 1
a pressure sensor configured to detect a pressure in the nozzle flow path
Implementation Method 2
a nozzle flow path configured to supply a negative pressure from a negative pressure source to the suction port of the nozzle
Data Source
AI summary
It is possible to appropriately determine whether a component is picked up when a nozzle having a small diameter is used. A component mounting device to which multiple types of nozzles having different sizes of suction ports each configured to pick up a component are detachably attached, includes: a nozzle flow path configured to supply a negative pressure from a negative pressure source to the suction port of the nozzle; a pressure sensor configured to detect a pressure in the nozzle flow path; a determining section configured to determine whether the component is picked up based on a detected value of the pressure sensor; and a flow rate changing section configured to change a flow rate of the negative pressure supplied from the nozzle flow path to the suction port in accordance with a size of the suction port.