Grating Blade Position Control via Dual Sensors
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Solution Overview
Problem
The precision of fitting radiation fields in radiotherapy equipment is limited by the difficulty in accurately controlling the positions of grating blades driven by motors, due to transmission errors and instability in the motor driving system, making verification and control complex.
Innovation Solution
A grating device with tail-end and front-end position controllers, central controller, and front-end position sensors that allow for precise verification and control of grating blades' positions, overcoming transmission and instability errors by measuring time and motor revolutions, enabling accurate positioning and control of grating blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If motor-driven grating blades are used to define radiation fields, then automation and efficiency are improved, but transmission errors and instability reduce positioning precision
Solution Approach 1:
The patent implements feedback control by using position sensors to detect the actual positions of grating blades and comparing them with target positions. The control system receives feedback signals about blade positions and automatically adjusts motor commands to correct any deviations, thereby maintaining high positioning precision despite motor transmission errors and instability.
Solution Approach 2:
The patent replaces pure mechanical positioning with an integrated electromechanical control system. Instead of relying solely on mechanical precision of motor-driven blades, the system uses electronic sensors and control algorithms to achieve precise positioning, substituting mechanical reliability with electronic control and feedback mechanisms.
2Extent of automation
If complex motor driving systems are used for grating blades, then automation is improved, but verification and control become complicated and difficult
Solution Approach 1:
The control system incorporates feedback from position sensors that continuously monitor blade positions and report to the central controller. This feedback mechanism simplifies verification by providing real-time positional data, eliminating the need for complex manual verification procedures while maintaining automation.
Solution Approach 2:
The system performs self-verification through automated feedback loops where the control system continuously monitors blade positions via sensors and automatically corrects deviations without external intervention. This self-service capability reduces operational complexity while maintaining high automation levels.
Data Source
AI summary
The invention discloses a grating device for radiotherapy equipment. A tail-end position controller and a front-end position controller are simultaneously arranged, and can simultaneously verify a tail-end position and a middle position of each single grating blade and measure the time during which one grating blade arrives at the middle position from the tail-end position and/or the total number of revolutions of a motor at any time. Because the distance between the tail-end position and the middle position is fixed and can be accurately measured, the system can accurately verify the position of one grating blade and control the grating blades to arrive at an accurately specified position; because the grating blades can be conveniently verified and controlled one by one, transmission errors caused by different grating blade driving systems and errors caused by instable performance can be effectively overcome; even verification can be performed before each fitting of a radiation field, and then accurate control can be realized according to the latest measured actual parameters.