In the medical imaging equipment, X-ray is very common imaging equipment, X-ray tube maintenance must be careful, once the failure will affect the progress of medical treatment, the following is a summary of the analysis of the medical X-ray tube common failures, let’s take a look!
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X-ray tube common failures a. X-ray tube anode target surface damage phenomenon (1) X-ray output significantly decreased, X-ray film sensitivity is insufficient. (2) As the anode metal is evaporated at high temperatures, a thin layer of metal coated on the glass wall is visible. (3) Through the magnifying glass, cracks, fissures and melt corrosion were visible on the surface of the target material. (4) The tungsten metal sputtered out when the focal point was severely melted may have damaged the X-ray tube by bursting.
Analysis. (1) overload use. There are two possibilities: first, the failure of the overload protection circuit, so that an exposure overload; second, multiple exposures, resulting in cumulative overload, melting and evaporation. (2) rotating anode of the X-ray tube rotor jammed or start protection circuit failure, exposure in the case of anode does not rotate or rotate at too low a speed, resulting in instantaneous melting and evaporation of the anode target surface. (3) poor heat dissipation. Such as heat sink and anode copper body contact is not close enough or too much grease.
X-ray tube common failures of the second. X-ray tube filament open-circuit phenomenon. (1) no X-ray exposure, milliammeter no indication. (2) through the X-ray tube window visible filament is not bright. (3) measurement of the X-ray tube filament, its resistance value is infinity.
Analysis. (1) X-ray tube filament voltage is too high, burned the filament. (2) X-ray tube vacuum is destroyed, a large amount of incoming gas so that the filament is rapidly oxidized and burned off after energization.
X-ray tube common fault three: the anode rotor rotation failure phenomenon. (1) the circuit is normal, but the rotation speed is significantly reduced; static rotation time is short; anode does not rotate during exposure. (2) exposure, the tube current increases sharply, the power fuse blows; anode target surface at a point is melted.
Analysis. Long-term work leads to bearing wear deformation and gap changes, and the molecular structure of the solid lubricant will also change.
