Component Mounting Device Negative Pressure Leakage Prevention
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Solution Overview
Problem
Existing component mounting devices fail to prevent negative pressure leakage when a suction error occurs in a component mounting device with detached selector valves and valve driving devices, particularly when nozzles held by holders at predetermined revolving positions fail to pick up electronic components by suction.
Innovation Solution
A component mounting device is designed with a valve driving device configured to drive selector valves corresponding to holders at predetermined revolving positions, allowing for communication control between holder flow paths and a negative pressure source, enabling a suction error determination and negative pressure recovery operation to prevent leakage by cutting off communication when a suction error occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If selector valves and valve driving devices are detached and positioned at predetermined revolving positions, then device complexity is reduced and ease of operation is improved, but negative pressure leakage occurs when suction errors happen
Solution Approach 1:
The control device determines whether nozzles have successfully picked up components before the holders complete their rotation, and prepares to cut off communication between holder flow paths and the negative pressure source when suction errors are detected. This preliminary detection and preparation prevents negative pressure leakage while maintaining the detached valve configuration.
Solution Approach 2:
The system implements feedback control by detecting suction errors (whether nozzles have picked up components) and responding by cutting off the negative pressure supply to affected holders. This feedback mechanism ensures reliability prevention of negative pressure leakage while maintaining the simplified detached valve structure.
2Reliability
If valve driving devices are provided at predetermined revolving positions to drive selector valves, then negative pressure leakage can be prevented when suction errors occur, but device complexity increases
Solution Approach 1:
The valve driving devices are segmented and positioned at specific predetermined revolving positions rather than being continuously distributed. This segmentation allows the system to achieve reliable negative pressure control at critical points while minimizing the overall number of valve driving devices required, thus reducing device complexity.
Solution Approach 2:
The valve driving devices at predetermined revolving positions serve multiple functions: they control the selector valves during normal operation, enable negative pressure recovery when suction errors occur, and work in conjunction with the rotating holder mechanism. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity.
3Reliability
If communication between holder flow paths and negative pressure source is continuously maintained, then component pickup reliability is improved, but negative pressure is wasted when suction errors occur
Solution Approach 1:
The control device takes preliminary anti-action by detecting suction errors and cutting off communication between holder flow paths and the negative pressure source before significant negative pressure loss can occur. This prevents the continuous waste of negative pressure while maintaining reliable component pickup when operations are successful.
Solution Approach 2:
The system uses periodic action by intermittently cutting off and restoring communication between holder flow paths and the negative pressure source based on suction success detection. Communication is maintained during successful pickups but cut off when suction errors are detected, creating a periodic on-off pattern that prevents energy waste while preserving pickup reliability.
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 device effectively prevents negative pressure leakage by executing a negative pressure recovery operation when a suction error is detected, ensuring efficient component pickup and maintaining system productivity.
Implementation Method 1
a negative pressure source configured to generate a negative pressure; a holder flow path formed in an interior space of the holder in such a manner as to communicate with the suction port of the nozzle; multiple selector valves provided in such a manner as to individually correspond to the multiple holders to make and break communications between the holder flow paths of the corresponding holders and the negative pressure source
Implementation Method 2
a nozzle configured to pick up the component by suction at a suction port
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A component mounting device includes multiple selector valves provided in such a manner as to correspond individually to multiple holders disposed on a rotary head in a circumferential direction and configured to switch between making and breaking communication between a corresponding holder flow path and a negative pressure source, and valve driving devices configured to drive selector valves corresponding to holders, among the multiple holders, located in predetermined revolving positions. Then, the component mounting device can execute a negative pressure recovery operation when a suction error is determined to have occurred in which the component is not held by suction to the nozzle after the suction operation is executed. When a suction error occurs at the nozzle held by the holder, the component mounting device performs the negative pressure recovery operation by waiting for the holder in question to be rotated to a predetermined revolving position and drives the selector valve corresponding to the holder in question using the valve driving device to cut off communication between the holder flow path and the negative pressure source.