Hydraulic Treadmill Control via PLC and HMI
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current aquatic treadmills lack advanced automation technologies, such as programmable logic controllers (PLCs) and comprehensive data management systems, which restrict remote monitoring and control capabilities, pose safety risks due to inadequate speed control, and struggle with data tracking and analysis, hindering personalized therapy plans and efficient documentation.
Innovation Solution
Integration of a programmable logic controller (PLC), programmable human-machine interfaces (HMIs), a variable frequency drive (VFD), and a 12-volt control pad to provide remote monitoring, safety features, and comprehensive data management, enabling precise control and data tracking, while using a 120-volt power supply for energy efficiency and mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic pump is housed out of the pool to avoid electrical shock risk, then safety is improved, but the complexity of the system increases due to hydraulic hoses and power unit integration
Solution Approach 1:
The patent introduces hydraulic hoses as intermediaries to transmit power and control signals between the out-of-pool power unit and the in-pool treadmill motor, enabling safe remote operation while maintaining system functionality
Solution Approach 2:
The patent replaces direct electrical connection with hydraulic fluid transmission to eliminate electrical shock hazards in the pool environment, using hydraulic pressure instead of electrical current for power and control
2Device complexity
If traditional pneumatic controls are used, then device complexity is reduced, but responsiveness and precision of speed control deteriorate
Solution Approach 1:
The patent replaces pneumatic control systems with electronic controls including a microprocessor and digital interface, enabling precise and responsive speed adjustment through electronic signal processing rather than mechanical pneumatic actuation
Solution Approach 2:
The patent implements programmable speed settings and variable frequency drive to control motor speed electronically, allowing precise control of treadmill speed through digital parameter adjustment rather than mechanical means
3Extent of automation
If comprehensive data management and PLC systems are integrated, then monitoring and control capabilities are improved, but device complexity increases
Solution Approach 1:
The patent integrates a microprocessor-based control system that performs multiple functions including speed control, data tracking, patient progress monitoring, and communication with external devices, consolidating multiple functions into a single universal controller
Solution Approach 2:
The patent implements data tracking and monitoring systems that collect information about patient progress and treadmill operation, providing feedback to the control system and enabling automated adjustments and comprehensive record-keeping
4Power
If a 220-volt power supply is used for the hydraulic pump, then power availability is improved, but installation cost and complexity increase due to electrical infrastructure requirements
Solution Approach 1:
The patent employs a variable frequency drive that can operate from standard 120-volt power supplies while providing adjustable power output to the hydraulic pump, eliminating the need for expensive 220-volt electrical infrastructure while maintaining adequate power availability
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
Enhances safety and effectiveness by allowing therapists to manage multiple patients remotely, tracks patient progress, and improves data management, ensuring accurate documentation and personalized therapy plans, while reducing energy consumption and installation costs.
Implementation Method 1
The treadmill is driven by an electrically powered hydraulic pump housed up and out of the pool which rotates a motor via hydraulic input and output hydraulic hoses
Implementation Method 2
due to the buoyancy of the water, the gravity borne by the body is reduced, and the compression of the joint is greatly reduced accordingly
Data Source
AI summary
A treadmill system for aquatic therapy, including: a control unit having programmed logic computer (PLC) and a HMI (HMI-1) located at the power unit on the pool deck, designed for physical therapists having a set of controls and override capabilities; a mechanism allowing the physical therapist to set and adjust the maximum speed of the treadmill through the HMI-1, which ensures the treadmill speed remains within safe limits; a control unit with a database storing patient-specific settings; an interface allowing input of a patient's name or code to retrieve previously stored settings; a feature enabling control of the speed settings based on the retrieved data, wherein the system personalizes treatment for each patient and enhances the consistency of therapy sessions; a 12-volt patient control pad located on the treadmill; and a display driven by a HDMI-2 is dedicated to displaying patient-specific data and feedback and providing entertainment for the patient.