Robotic Arm Control System for Automatic Jig Plate Selection
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Solution Overview
Problem
In automatic screw fastening devices for liquid crystal modules, the inefficiency in screw fastening arises when the bezel is lifted from the backlight, requiring manual intervention and frequent selection of jig plates, which hampers working efficiency, especially when producing diverse products in small quantities.
Innovation Solution
A robotic arm control system with two robotic arms, an information reading unit, a jig plate seating unit, and a controller that automatically selects and positions a compatible jig plate on the workpiece, ensuring precise alignment and insertion of screws, even for various types of workpieces, thereby enhancing working efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual selection and attachment of jig plates is performed, then the bezel can be pressed down correctly, but the working efficiency decreases due to frequent operator intervention
Solution Approach 1:
The system enables automatic selection and attachment of the appropriate jig plate based on workpiece type recognition, eliminating the need for manual operator intervention. The robotic arm autonomously retrieves the correct jig plate from the storage unit and positions it on the workpiece, allowing the system to serve itself without human assistance while maintaining pressing accuracy.
Solution Approach 2:
The manual mechanical operation of selecting and attaching jig plates is replaced by an automated robotic system. The robotic arm, controlled by a controller that receives workpiece type information from the recognition unit, substitutes the operator's manual actions, thereby improving productivity while maintaining the mechanical pressing function.
2Adaptability or versatility
If multiple types of jig plates are prepared for different workpiece types, then adaptability to various products is improved, but the device complexity increases
Solution Approach 1:
The robotic arm serves multiple functions: it not only performs the screw fastening operation but also automatically selects and attaches the appropriate jig plate based on the recognized workpiece type. This multi-functionality reduces the need for separate manual operations and simplifies the overall system despite handling multiple workpiece types.
Solution Approach 2:
The storage unit acts as an intermediary between the robotic arm and multiple jig plate types. Instead of requiring the system to manage all jig plates directly, the storage unit organizes and provides the appropriate jig plate to the robotic arm based on workpiece type information, simplifying the complexity of managing multiple components.
3Adaptability or versatility
If the bezel is lifted from the backlight, then assembly flexibility is improved, but the screw fastening reliability deteriorates
Solution Approach 1:
The jig plate is attached to the workpiece before the screw fastening operation begins. This preliminary action ensures that the bezel is held in the correct position and prevented from lifting during the subsequent screw fastening process, thereby maintaining reliability while allowing assembly flexibility.
Solution Approach 2:
The jig plate applies preliminary downward pressure on the bezel to counteract any lifting forces that may occur during assembly. This preliminary anti-action prevents the bezel from lifting before the screws are fully fastened, ensuring reliable screw fastening while maintaining the flexibility to handle various workpiece configurations.
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(c)
AI summary
In a robotic arm control system 10, first, a first camera 24 of a first arm 21 reads a two-dimensional bar code attached to a workpiece W. Next, a jig plate engaging unit 22 of the first arm 21 takes out a jig plate P corresponding to the workpiece type indicated by the two-dimensional bar code from a jig plate table 60, positions and places the jig plate P on the workpiece W in a predetermined positional relationship, and presses down on the workpiece W with the jig plate P. A screw fastening unit 32 of a second arm 31 screws the screws into screw holes of the workpiece W by using guide holes of the jig plate P pressing down on the workpiece W.