Anticollision protective device for medical electronic linear accelerator

Abstract

The invention provides an anticollision protective device for a medical electronic linear accelerator. The anticollision protective device includes a limit switch which is arranged at a preset horizontal position which is a position to which a lifting floor needs to descend when a rotating rack is located in a preset angle range, wherein the limit switch judges whether the lifting floor triggers the limit switch; a signal conditioning circuit which sends a first digital signal corresponding to the limit switch to a logic judgment circuit; an inclined-angle sensor which is arranged on the rotating rack to detect the angle of the rotating rack; an angle judgment circuit which sends a control signal to the logic judgment circuit when it is judged that the angle is in the preset angle range; the logic judgment circuit which carries out logic calculation on the first digital signal and the control signal; a control circuit which controls the rotating rack to stop rotating when it is judged the calculation result complies with an collision condition; and the rotating rack which is driven to rotate by a driving motor. All components of the device are realized by pure hardware so that the device is simple to control and free from communication circuits and thus the device is high in anti-interference capability and higher in reliability.

Description

Technical field [0001] The present invention relates to the field of electronic technology, in particular to an anti-collision protection device for a medical electronic linear accelerator. Background technique [0002] At present, the 6MV medical linear accelerator adopts standing wave accelerating tube, which is installed vertically, such as figure 1 As shown, the standing wave acceleration tube is arranged on the treatment head 5, and the treatment head 5 can be rotated under the drive of the rotating gantry 2. It can be understood that the rotating frame 2 can rotate around the rotating shaft 1 within a range of 360°. [0003] Based on medical requirements, there is a requirement for the height between the rotating shaft 1 and the ground plane 8. Therefore, when the rotating gantry 2 is rotated to a vertical position, the horizontal position of the treatment head 5 needs to be lower than the ground plane 8. [0004] Based on this requirement, a lifting floor 6 is set within a ce...

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Problems solved by technology

[0009] However, this anti-collision method in the prior art has the following disadvantages: the position information of the lifting floor 6 is measured using a wire-guide encoder, which is expensive, and one needs about five thousand yuan; in addition, because the position of the wire-guy encoder is close to the standing wave accelerator The X-ray source, the encoder failure rate is relatively high when exposed to X-rays for a long time

In addition, because the position information of the wire-guide encoder is transmitted to the controller through 485 communication, the controller is a combination of software and hardware to read the position information of the lifting floor, so the communication line is complicated and the transmission interference is large, which is easy to cause misjudgment or misuse

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