Weighing Device Through-Hole Laser Processing for Eccentric Load Errors
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Solution Overview
Problem
Existing laser processing methods for weighing devices expose the monolithic structure outside the housing member, leading to potential eccentric load errors due to inadequate eccentric load adjustment after assembly.
Innovation Solution
A weighing device with a housing member containing through holes for guiding laser light to the strain body, combined with an adjustment device that irradiates and processes the strain body to reduce eccentric load errors, using a control unit to determine optimal irradiation positions and amounts based on measured weighing values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser processing is performed before housing assembly, then manufacturing efficiency is improved, but eccentric load error increases due to inability to perform adjustment after assembly
Solution Approach 1:
The patent applies preliminary action by providing through-holes in the housing member during the manufacturing stage, enabling future laser processing access. This preliminary structural preparation allows the strain body to be processed after housing assembly, resolving the contradiction between early processing efficiency and later adjustment precision.
2Ease of operation
If the strain body is exposed outside the housing member, then laser processing access is improved, but measurement accuracy deteriorates due to eccentric load error
Solution Approach 1:
The patent implements nesting by placing the strain body inside the housing member while providing through-holes that allow laser light to reach the strain body from outside. This nested configuration maintains the protective enclosure while enabling external processing access, resolving the contradiction between ease of operation and measurement precision.
Solution Approach 2:
The through-holes in the housing member act as intermediaries, transmitting laser light from the external processing environment to the internal strain body. This intermediary structure enables laser processing access without requiring the strain body to be exposed outside the housing, thus maintaining measurement accuracy while improving operational ease.
3Object-affected harmful factors
If the housing member is made opaque for protection, then environmental protection is improved, but laser light transmission to strain body deteriorates
Solution Approach 1:
The housing member is segmented with localized through-holes that provide laser light transmission paths while maintaining the overall opaque protective structure. This segmentation allows selective transparency where needed (for laser access) while preserving opacity for environmental protection, resolving the contradiction between protection and energy transmission.
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
Effectively reduces eccentric load errors by accurately adjusting the strain body through controlled laser processing, ensuring precise weight measurements.
Implementation Method 1
irradiating the recess with laser light so that the value measured by the force sensor of the weighing cell becomes the expected result
Data Source
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AI summary
The weighing device 1A according to one embodiment includes a weighing pan 2 on which an object to be weighed is placed, a load cell 4 having a strain body 5 disposed below the weighing pan 2 so that a load of the object placed on the weighing pan 2 is applied to the strain body 5, and a housing member 3 accommodating the load cell 4. The housing member 3 is provided with a through-hole 31a for guiding laser light irradiated from the outside of the housing member 3 to the strain body 5 disposed inside the housing member 3.