Traditional Chinese Medical X-ray machine fluoroscopy automatic control device (Workshop Practice) — Circuit, Wiring & Debug Guide

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Medical X-ray machine fluoroscopy automatic control deviceThe fluoroscopy automatic control circuit is shown in Figure 30-1. Its power supply is composed of 6V AC power supply (here the internal 6V indicator light power supply is used), diode VD and capacitor C1. When using an X-ray machine for fluoroscopy, the automatic fluoroscopy switch S is turned to the "automatic" position, and the 6V AC power is rectified by VD and filtered by C1 to become a DC power supply. This power supply charges C2 via R3 and KL1-3 normally closed contacts. When the voltage across C2 reaches the peak voltage of VT1, VT1 is triggered and rapidly discharges to R2. The positive sharp pulse generated on R2 is added to the VS control pole through the normally closed contact of KL1-2, causing VS (3CT1) to conduct, and the current flows through the coil of KL1, causing KL1 to act. The normally open contact of KL1-1 driven by KL1 is closed (as shown in Figure 30-2), the TC perspective high-voltage relay KM is electrically activated, X-rays are generated, and the exposure begins. When KL1 is powered on and exposure begins, the KL1-3 and KL1-2 contacts it drives reverse direction. On one side, connect the R2 terminal to the base of VT2, and on the other side, change the DC power supply to charge C2 through the normally open contacts of RP1 and KL1-3. When the voltage across C2 reaches the peak voltage of VT1, VT1 is triggered again, and the positive sharp pulse output from both ends of R2 is added to the base of VT2 from the normally open contact of KL1-2, causing it to instantly saturate and conduct, making the collector voltage of VT2 close to zero. Make VS less than the maintenance voltage and return to the blocking state, so that KL1 is powered off and released, X-rays stop, and the exposure ends. At this time, due to the release of KL1, KL1-3 and KL1-2 return to the static position, and the action starts from the original state. Since the start and end of exposure occur alternately and cycle continuously, continuous exposure of several seconds and an interval of 1 second can be obtained to achieve the purpose of automatic perspective.When VT1 outputs an odd positive spike pulse, the trigger VS changes from the blocking state to the conducting state. When VT1 outputs an even-numbered positive spike pulse, VT2 is instantly saturated and turned on, which in turn prompts VS to return to the blocking state. alt="46.jpg (37062 bytes)">Figure 30-1 …

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