Starting steps of X-ray machine

Working principle (1) When taking pictures, the second unit works. After startup, JCIIA and JCIIB work to complete the switching of stations. If the shooting conditions are selected correctly and the technology selection switch AJ is selected correctly, press the exposure button AN 10, JC8 and JC5 will work successively, the filament will be heated, and the rotating anode will start to run. After 1.2s, J4 will start to finish the shooting preparation. Release the exposure button AN 10, JC8 will be powered off, and its normally closed contacts JC8(23, 24) will be closed. When JC3A and JC3B work, time delay relay J 1 1, upper brake relay J9 and isolation relay J 13 will work in succession. Power-on circuit of J 13: * Working principle (2) After power-on of J13 (8,2), BG96 anode is powered on. Subsequently, when the power supply voltage crosses zero, BG85 in the signal generating circuit is turned off, and a pulse voltage is obtained between the control electrode and the cathode of BG96, and BG96 is immediately turned on, and a DC voltage of 25V is applied to the time-limit circuit, triggering relays J6A and J6B to be energized to work. Its power-on circuit is: its normally open contact is closed, the base circuits of BG8 1 and BG82 in the trigger circuit are turned on, BG8 1 and BG82 are turned on, the trigger signal is output, the main thyristor is turned on, the high voltage is turned on once, and exposure is started. * Section 6 Time-limited circuit * Because the X-ray machine adopts the method of controlling the time limit of point photography and other photography respectively, there are two sets of time-limited circuits in the circuit composition:

I. Time-limited circuit for fixed-point photography (located on the hospital bed for control)

Second, the photography time-limited circuit (controlled on the console) * First, the on-site photography time-limited circuit * Composition: Working principle After starting, I work, JC IA and JC IB work, and connect the power supply of this circuit. When the high-voltage contactor JC2 does not work and JC8 does not work, pull down the card holder, and the control circuit switches the circuit to the point-and-shoot state, and JC8 works, and J 1 is powered on: after the film is in place, press the point-and-shoot switch, and JC8 is powered off, and JC2 works, and exposure begins. Capacitor charging circuit: J 1 loses power, JC2 circuit is cut off, and the exposure is over. Capacitor discharge circuit: * 2. Photography time limit circuit (1) This circuit consists of thyristor contactless switch synchronous time limit circuit. The main thyristors BG 17 and BG 18 are connected in parallel and in series in the primary circuit of photographic high voltage. When the AC voltage crosses zero, the DC trigger signal output by the time limit circuit is applied to the control stages of BG 17 and BG 18.