Pin-Type Load Cell Circuit Integration for Compact Load Detection
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Solution Overview
Problem
Existing load detection mechanisms, including coupling pins, are not suitable for both large outdoor and small indoor applications, and the type and size of coupling pins vary, limiting their versatility and effectiveness.
Innovation Solution
A load detection mechanism using a pin-type member with strain gauges and a circuit substrate, where a groove accommodates wiring and a connection circuit is formed on the circuit substrate, allowing for compact design and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional coupling pin with strain gauges is used for load detection, then load detection capability is achieved, but the device size and complexity increase
Solution Approach 1:
The patent merges the strain gauges, wiring, and circuit substrate into a single integrated assembly that attaches to the pin. The circuit substrate contains both the bridge circuit connecting strain gauges and the amplification circuit, eliminating the need for separate wiring harnesses and reducing overall device complexity while maintaining load detection capability
Solution Approach 2:
The circuit substrate acts as an intermediary component that consolidates multiple functional elements. By placing the bridge circuit and amplification circuit on a single substrate, it mediates between the strain gauges on the pin and the external measurement system, reducing the complexity of connections and device assembly
2Ease of manufacture
If wiring is exposed on the pin surface, then electrical connections are established, but noise interference increases
Solution Approach 1:
The wiring is nested within grooves formed on the pin surface, and the circuit substrate is nested against the pin body. This nesting arrangement protects the wiring from external electromagnetic interference while maintaining electrical connections, effectively reducing noise interference without complicating the manufacturing process
3Reliability
If multiple separate components are used for load detection, then functional requirements are met, but manufacturing cost increases
Solution Approach 1:
The patent combines the bridge circuit and amplification circuit onto a single circuit substrate, reducing the number of separate components that need to be manufactured, assembled, and wired. This integration maintains all necessary functional requirements for load detection while reducing assembly complexity and manufacturing cost
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 load detection with a small pin-type load cell, reducing noise interference and manufacturing costs while maintaining detection accuracy.
Implementation Method 1
a plurality of strain gauges attached to the pin
Implementation Method 2
a connection circuit forming a bridge circuit by connecting the plurality of strain gauges
Data Source
AI summary
A load detection mechanism for detecting a load of an object includes a first member connected to a fixed structure; a second member for suspending an object; a pin (CP1, CP2) configured to cause the second member to be suspended from the first member by continuously penetrating the first member and the second member; a plurality of strain gauges (SG1 to SG8) attached to the pin; and a circuit substrate disposed above the second member. A connection circuit (CC) forming a bridge circuit by connecting the plurality of strain gauges and an amplification circuit (AC) configured to amplify output from the bridge circuit are formed on the circuit substrate.