Component Mounting Machine Nozzle Control for Negative Pressure Leakage
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Solution Overview
Problem
In component mounting machines with multiple Z-axis driving devices, simultaneous pickup operations using multiple suction nozzles can lead to excessive negative pressure leakage, causing components to fall due to insufficient suction when pickup errors occur.
Innovation Solution
A component mounting machine with a control device that manages two types of pickup operations based on the absolute value of negative pressure from the negative pressure source, performing single or simultaneous nozzle operations depending on threshold values to prevent component dropping during errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous pickup operation is performed using multiple nozzles with one negative pressure source, then productivity is improved by picking up multiple components simultaneously, but reliability deteriorates because excessive negative pressure leakage causes components to fall when pickup errors occur
Solution Approach 1:
The patent divides the single negative pressure supply system into multiple independent negative pressure supply units, with each nozzle having its own dedicated negative pressure supply. This segmentation prevents negative pressure leakage from one nozzle from affecting other nozzles, thereby maintaining component holding stability while enabling simultaneous pickup operations across multiple nozzles.
2Productivity
If multiple nozzles are lowered simultaneously to pick up multiple components, then the quantity of components picked up per operation increases, but the negative pressure leakage increases causing insufficient suction pressure
Solution Approach 1:
By providing independent negative pressure supply units for each nozzle, the system can maintain adequate negative pressure at each nozzle even when multiple nozzles are operating simultaneously, preventing the pressure drop that would occur with a shared negative pressure source.
Solution Approach 2:
The patent enables independent control of negative pressure parameters for each nozzle, allowing optimization of suction pressure for each specific pickup operation while maintaining overall system productivity.
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 machine effectively picks up multiple components while minimizing the risk of components being dropped by other suction nozzles, even when pickup errors occur, by controlling the negative pressure supply and nozzle movements according to set threshold values.
Implementation Method 1
a negative pressure supply device including a negative pressure source configured to generate negative pressure, the negative pressure supply device being configured to supply negative pressure from the negative pressure source individually to the suction openings of the multiple nozzles
Data Source
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AI summary
A component mounting machine including: a head including multiple nozzles configured to pick up the component using a suction opening; a negative pressure supply device including a negative pressure source configured to generate negative pressure, the negative pressure supply device being configured to supply negative pressure from the negative pressure source individually to the suction openings of the multiple nozzles; a raising and lowering device configured to individually raise and lower the multiple nozzles; and a control device configured to perform a first pickup operation of controlling the raising and lowering device to lower one of the nozzles and controlling the negative pressure supply device to supply negative pressure to the suction opening of that nozzle so as to pick up the component using the suction opening of that nozzle, and a second pickup operation of controlling the raising and lowering device to lower multiple of the nozzles simultaneously and controlling the negative pressure supply device to supply negative pressure to the suction openings of those multiple nozzles so as to pick up the components simultaneously using the suction openings of those multiple nozzles. The control device performs the second pickup operation in a case in which an absolute value of the negative pressure from the negative pressure source is equal to or greater than a first threshold value, performs the first pickup operation in a case in which the absolute value of the negative pressure from the negative pressure source is less than the first threshold value and equal to or greater than a second threshold value that is lower than the first threshold value, and does not perform any pickup operation in a case in which the absolute value of the negative pressure from the negative pressure source is less than the second threshold value.