Servo-Controlled Component Placement for Low-Load Accuracy
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Solution Overview
Problem
Existing component placing devices face challenges in stably controlling installation loads with high accuracy in low-load regions due to variations in the sliding state of suction nozzle mechanisms, particularly when handling micro components, which can lead to component damage.
Innovation Solution
A component placing device equipped with a servo motor and a controller that sets a thrust limit value for the servo motor, ensuring the load from the component holder is always lower than the biasing force, allowing precise control of the installation load through a preset operation pattern, and separates the component holder after landing to prevent excessive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suction nozzle mechanism is used to hold and place components, then component placement can be performed, but variations in sliding state cause unstable control of installation loads in low-load regions
Solution Approach 1:
The patent replaces the mechanical suction nozzle sliding mechanism with a servo motor-driven system. The servo motor provides precise control of the component holder's movement and installation load through electronic control, eliminating the sliding state variations that affected the mechanical suction nozzle system. This substitution enables stable and accurate load control in low-load regions.
Solution Approach 2:
The patent changes the control parameter from mechanical sliding position to servo motor thrust force. By controlling the thrust force of the servo motor, the system can precisely regulate the installation load applied to components. The thrust limiter further refines this control by setting maximum thrust values to prevent excessive force, ensuring stable load control across different operating conditions.
2Reliability
If the component holder presses the component with high force to ensure placement, then placement reliability improves, but component damage may occur due to excessive load
Solution Approach 1:
The patent applies preliminary anti-action by setting a thrust limiter that prevents the servo motor from generating excessive thrust force. Before the component holder can apply damaging force to the component, the thrust limiter preemptively caps the maximum thrust, thereby preventing component damage while still allowing sufficient force for reliable placement.
Solution Approach 2:
The patent implements feedback control through the servo motor system, which continuously monitors and adjusts the thrust force applied by the component holder. This closed-loop control ensures that the installation load remains within safe limits while achieving reliable component placement, preventing both insufficient placement and excessive force damage.
3Productivity
If the thrust of the servo motor is increased to improve placement speed, then productivity increases, but control accuracy of installation load deteriorates
Solution Approach 1:
The patent applies dynamics by allowing the servo motor to operate at high speeds for rapid positioning while using the thrust limiter to dynamically adjust and cap the thrust force during the actual placement operation. This enables the system to achieve both high productivity through fast movement and high precision through controlled force application at the critical moment of component placement.
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 solution enables stable and accurate control of installation loads in low-load regions, preventing component damage and ensuring precise placement even with variations in board height, thereby improving the reliability of the component placing process.
Implementation Method 1
an elastic body that biases the component holder downward with respect to the shaft
Implementation Method 2
a suction hole for holding the component by a negative pressure
Data Source
AI summary
A component placing device to place a component on a board, including: a shaft having a lower portion and an upper portion; a component holder that is attached to the lower portion of the shaft in a state of being vertically displaceable and has a suction hole for holding the component by a negative pressure; an elastic body that biases the component holder downward with respect to the shaft; a servo motor that raises and lowers the shaft; and a controller that sets a thrust limit value for limiting a thrust of the servo motor and limits the thrust of the servo motor to be equal to or lower than the thrust limit value when the component holder is lowered toward the board. The thrust limit value is set within a range in which a load is smaller than a force by which the elastic body biases the component holder.