Wireless Axial Load Cell With Orientation-Independent Mounting
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Solution Overview
Problem
Existing wireless load cell assemblies face challenges such as requiring specific rotational positioning, high current draw leading to frequent battery replacements, limited capability to measure characteristics like velocity, acceleration, and position, and lack of bi-directional communication, making them impractical for dynamic and harsh environments like pumpjack systems.
Innovation Solution
An integrated wireless data system with a wireless load cell assembly that includes a housing with embedded strain gages, additional sensors, and an electronics system for bi-directional communication and control, featuring a low power consumption design with energy harvesting and onboard statistics logging, allowing for the measurement of load, velocity, acceleration, temperature, and position without the need for anti-rotation couplers and frequent battery replacements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing wireless load cell assemblies are used, then wireless data transmission is achieved, but specific rotational positioning is required which increases installation complexity and device complexity
Solution Approach 1:
The load cell assembly is designed with a universal mounting interface that accepts multiple orientations (0°, 90°, 180°, 270°), allowing the device to function reliably in any rotational position without requiring precise alignment during installation. This eliminates the need for anti-rotation couplers and specialized mounting hardware.
Solution Approach 2:
The wireless communication system incorporates dynamic orientation detection and automatic signal optimization that adjusts transmission parameters based on the actual installation orientation, maintaining reliable data transmission regardless of how the device is mounted on the pumpjack.
2Measurement precision
If existing wireless load cell assemblies are used, then load measurement is achieved, but high current draw requires frequent battery replacement which increases maintenance requirements
Solution Approach 1:
The system implements periodic wake-sleep cycles where the microcontroller and wireless transceiver remain in low-power sleep mode between measurements, only activating periodically to take measurements and transmit data. This reduces average current draw from >6mA to <2mA, extending battery life from 3 months to over 2 years.
Solution Approach 2:
The measurement and transmission parameters are dynamically adjusted based on operational conditions - sampling frequency is reduced during normal operation and increased only when anomalies are detected, and transmission power is optimized based on signal quality, further reducing energy consumption while maintaining measurement precision.
3Loss of information
If existing wireless load cell assemblies are used, then basic load data transmission is achieved, but additional sensors increase device complexity and power consumption
Solution Approach 1:
Multiple sensing functions (load cell, accelerometer, velocimeter, temperature sensor) are integrated into a single unified sensor assembly with a common mounting interface and shared power/communication bus. This consolidates what would otherwise be separate devices into one integrated unit, reducing overall system complexity while enabling comprehensive data collection.
Solution Approach 2:
The sensor assembly is designed as a multi-functional platform where a single device package provides load measurement, vibration analysis, speed monitoring, and temperature sensing capabilities, eliminating the need for multiple separate sensors and their associated mounting and wiring infrastructure.
4Loss of information
If existing wireless load cell assemblies are used, then unidirectional communication is achieved, but bi-directional communication increases power consumption and device complexity
Solution Approach 1:
The wireless system implements a feedback mechanism where the base station can send commands and configuration updates to the load cell assembly, and the assembly can acknowledge receipt and report status. This bi-directional communication enables remote system optimization and diagnostics while using efficient protocols that minimize transmission frequency and power consumption.
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 system enables long-term operation without battery replacement, bi-directional communication, and comprehensive data collection, improving diagnostics and predictive maintenance in dynamic systems like pumpjack systems, reducing maintenance costs and enhancing operational efficiency.
Implementation Method 1
a load cell and a plurality of strain gages... measuring the weight of the fluid in the production tubing
Data Source
AI summary
An integrated wireless data system including a wireless load cell assembly and method for measuring operational data of one or more components for safety, health monitoring, and control is provided. The wireless load cell assembly can include an energy storage device and may be configured to allow for bi-directional communication with a base unit to store operational parameters in a database for use in development of predictive maintenance techniques. The axial load cell can rotate freely for simple installation without regard to rotational orientation. A power management strategy and energy harvesting system are provided to ensure long term use of the wireless load cell assembly without the need to replace the energy storage device.