Strain Sensor for 3D Printer Leveling via Piezoresistive Detection
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Solution Overview
Problem
Existing 3D printing leveling methods using actuators with micro switches are prone to measurement errors due to the distance between the installation position and the nozzle, making manual correction complicated and inaccurate.
Innovation Solution
A strain sensor with a metal spring steel fixing plate and a resistance strain gauge is used to detect the deformation between the printing head and the platform, allowing for automatic leveling by converting the deformation into voltage changes for precise distance adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro switches are installed on the actuator for leveling detection, then the leveling function can be achieved, but measurement errors occur due to the distance between the installation position and the nozzle
Solution Approach 1:
The patent extracts the measurement function from the actuator installation position and relocates it to the nozzle position by integrating the strain gauge directly on the printing head, eliminating the distance-induced measurement errors and the need for manual correction
Solution Approach 2:
The strain gauge serves as an intermediary measurement element that directly detects the distance between the nozzle and the printing platform, mediating the measurement process to eliminate errors caused by remote actuator installation
2Measurement precision
If a flexible fixing plate is used to detect deformation for leveling, then measurement precision is improved, but the structure becomes more complex
Solution Approach 1:
The patent changes the physical state of the fixing plate from rigid to flexible, enabling it to deform under load and convert mechanical displacement into measurable strain signals through the strain gauge, thereby improving measurement precision
Solution Approach 2:
The patent merges the fixing plate and strain gauge into an integrated measurement system where the flexible plate provides both structural support and measurement capability, simplifying the overall device while maintaining precision
3Device complexity
If the printing head is directly connected to the printer, then the structure is simple, but damage may occur due to direct impact
Solution Approach 1:
The patent applies beforehand cushioning by using the flexible fixing plate as a buffer element that absorbs impact energy before it reaches the printing head, preventing damage while maintaining structural simplicity
Solution Approach 2:
The patent employs a flexible fixing plate that combines the cushioning properties of flexible materials with the structural function of a rigid connector, providing both impact protection and mechanical support
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
The strain sensor provides a simple, reliable, and sensitive solution for maintaining the horizontal status of the printing surface, preventing damage from direct impacts and eliminating the need for manual leveling, enabling more stable and accurate 3D printing operations.
Implementation Method 1
a strain gauge is provided on the second supporting part
Data Source
AI summary
Provided is a strain sensor including a fixing plate and a strain gauge. The fixing plate includes a first supporting part and a second supporting part flexibly connected to the first supporting part. The present application is advantageous in that a strain sensor with a simple structure, high reliability and high sensitivity is provided. The horizontal status of a contact surface may be detected by a little amount of deformation, and the flexible fixing plate can provide a buffer for the equipment to prevent damages due to direct impact.