Multi-leaf collimator flexible regulating type encoder closed-loop control system

Abstract

The invention discloses a multi-leaf collimator flexible regulating type encoder closed-loop control system. The multi-leaf collimator flexible regulating type encoder closed-loop control system comprises leaves, a grating scale, a mobile slide block, a driving mechanism, a sensor and an integrated circuit board. The mobile slide block is connected with the leaves, and the mobile slide block is clamped on the grating scale and can freely slide along the grating scale. The sensor is fixed on the mobile slide block, and the sensor and the integrated circuit board are connected via electric signals. The driving mechanism is used for driving the leaves to perform linear reciprocating movement. Detection precision of the leaf position can be enhanced, installation is convenient, time of replacing consumables can be greatly reduced, equipment usage rate can be enhanced and equipment use cost can be reduced.

Description

Technical field [0001] The invention relates to the field of medical device manufacturing control, in particular to a closed-loop control system of a multi-leaf grating flexible adjustable encoder. Background technique [0002] The leaf movement accuracy of the multi-leaf grating is one of its important characteristics. The radiation accuracy (conformity) formed by the leaf movement is directly related to the radiation shape and dose absorption of the patient’s lesion area, and more directly to the The maximum protection of human normal tissues and sensitive tissues can achieve the expected effect of tumor radiotherapy. Therefore, in the manufacturing and use of multi-leaf gratings, the measurement of blade motion accuracy is particularly important. [0003] In order to improve the detection of blade motion accuracy, various methods have been adopted on the market. At present, the new type is detected by a photoelectric encoder. The principle is to determine the movement position...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-leaf grating flexible adjustable encoder closed-loop control system, which solves the problem that the blade will deflect up and down due to the influence of its own weight and its machining accuracy during the motion accuracy detection of the blade, and then Drive the code bar to deflect, causing the detection source itself to deflect. This kind of accuracy error cannot be compensated by chip processing, resulting in the problem of limited motion accuracy; on the other hand, the rapid reciprocating movement of the code bar will cause serious wear and tear. Shorter service life, resulting in higher product maintenance costs

Images