Multiaxial Actuator Load Sensor with Strain Gauge Neck
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Solution Overview
Problem
Existing multiaxial actuators in chip mounters face challenges in precisely detecting the pressing force applied to chips, risking attraction failure at insufficient force or chip damage at excessive force.
Innovation Solution
A load sensor integrated multiaxial actuator design featuring a coupling member with a strain gauge on a thinner neck part between two shaft-like members, allowing precise detection of pressing force by measuring deflection through resistance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a linear motor actuator with a hollow shaft-like member is used for chip mounting, then the actuator can perform linear motion to position the chip, but the pressing force detection precision is insufficient leading to attraction failure or chip damage
Solution Approach 1:
The patent merges the coupling member that connects the drive shaft and suction shaft with a strain gauge to form an integrated load sensor. This combination allows the coupling member to both mechanically connect the two shafts and simultaneously detect the pressing force applied to the chip, thereby achieving precise force measurement while ensuring reliable chip attraction.
Solution Approach 2:
The strain gauge acts as an intermediary element that converts mechanical pressing force into an electrical signal. By attaching the strain gauge to the coupling member, the mechanical force transmitted through the coupling member during chip suction is converted into measurable electrical resistance changes, enabling precise detection of the pressing force.
2Reliability
If the pressing force is increased to ensure chip attraction, then the chip can be reliably suctioned, but the chip may be damaged due to excessive force
Solution Approach 1:
The strain gauge provides real-time feedback on the pressing force applied to the chip. This feedback mechanism allows the system to monitor the actual force being applied and adjust it to remain within the optimal range, preventing both insufficient attraction and excessive force that could damage the chip.
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
Enables precise detection of pressing force, preventing attraction failure and chip damage by accurately measuring the reactive force applied during chip suction.
Implementation Method 1
the neck part includes a strain gauge attached to a front surface of the neck part
Data Source
AI summary
Provided is a load sensor that can precisely detect a load of pressing force to an object. A load sensor to be used for a multiaxial actuator (10) that has a drive rod (12) that linearly moves in an axial direction in a state where the drive rod (12) is contained in a housing (11), and a suction rod (22) that is arranged in parallel with the drive rod (12), linearly moves at the same time as the drive rod (12) in the axial direction, and has a tip end portion (22a) to be pressed, when a chip is to be suctioned, against the chip, includes a coupling member (30) that couples the drive rod (12) and the suction rod (22), the coupling member (30) has a first coupling part (31) that couples the drive rod (12), and a second coupling part (32) that couples the suction rod (22), and a neck part (33) that is provided between the first coupling part (31) and the second coupling part (32) and formed to be thinner than the first coupling part (31) and the second coupling part (32), and the neck part (33) includes strain gauges (41) to (44) attached to a front surface of the neck part (33).