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北京生产的F_(102)-I型X线机,其曝光限时电路结构简单,但没有安全保护装置。当限时电路中任一元件发生断路故障时,都可能使限时继电器JD_1不工作,J3不释放,高压初级电路无法切断。尤其是预置KV、mA较高时,由于X线管实际上的超负荷,使阳极靶面过热熔化,导致球管严重受损。为了防止此类无限时曝光的故障发生,我们对限时器电路作了改进(见附图)。
The F_(102)-I type X-ray machine produced in Beijing has a simple exposure exposure circuit, but no safety protection device. When a fault occurs in any one of the elements of the time-limited circuit, the time-limiting relay JD_1 may not work, and the J3 may not be released, and the high-voltage primary circuit may not be cut off. In particular, when the preset KV and mA are high, the anode target surface is overheated and melted due to the actual overload of the X-ray tube, resulting in serious damage to the tube. In order to prevent such an infinite exposure from occurring, we have made improvements to the time limiter circuit (see the attached figure).