适用范围：
JZD-B系列轮对磁粉探伤机是为满足机车、车辆（含动车组、地铁车辆、轻轨车辆、轨道车辆）轮对的磁粉探伤需要而开发的。按照功能和结构的不同分别适用于：
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轮对组装状态下车轮、制动盘等表面的磁粉探伤
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轮对组装状态下牵引从动齿轮齿面、轴身、轴颈表面的磁粉探伤
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牵引从动齿轮和车轴组装状态下齿轮外露表面和车轴外表面的磁粉探伤
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单个牵引从动齿轮或单个车轮、轮心的磁粉探伤
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轮箍的磁粉探伤
功能及特点
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周向磁化（或中心导体磁化）采用柔性电极，保证通电可靠不打火，磁化效果稳定
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纵向磁化采用镀银接点强力锁紧钳形开合线圈，接合更可靠，性能更稳定。
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采用了附加局部旋转磁场来满足齿轮齿廓面的表面切向磁场强度
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针对车轮的磁粉探伤机采用旋转磁场来降低沿车轮半径方向磁场分布的不均匀度
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采用了变频传动装置来控制轮对旋转，转速可自由设定并实现动态换向。
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磁化电流由可控硅调压模块控制，电流大小可根据盘饼工件大小的不同随时调整；
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磁化线圈断电时采用了不等值的衰减措施，使电流按预定程序逐渐衰减到零，经系统自动进行的原位退磁工序后，探伤件的剩磁小于0.3mT
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龙门式主机结构适合轮对通过方式探伤，尤其适合轮对检修线配套
主要技术指标
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磁化方式：复合磁场+局部旋转磁场
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周向磁化峰值电流：0-4800A 连续可调
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纵向磁化磁动势：0-28000AT 连续可调
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周向磁化夹头间距：670-2500mm
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悬臂支撑最大工件重量：3000kg
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工件最大回转直径：1350mm
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退磁方式：原位衰减法
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检测灵敏度：清晰显示A1型标准试片15/50的人工缺陷
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剩磁：不大于0.3mT
JZD-B Series Magnetic Particle Flaw Detector for Wheel Pair
Applicable scope
It is designed to meet the locomotive, rolling stock (including the EMU, subway cars, light rail vehicles, rail vehicles) wheel pairs round the needs of the development of magnetic particle testing. In accordance with the functional and structural differences are for:
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In the state of the wheel pair assembly the surface of wheel, brake disc and others magnetic particle testing
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In the state of the wheel assembly driven gear tooth surface, the body axis, the journal surface of the magnetic particle testing
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In the state of the driven gear and axle gear assembly the outer surface of the exposed surface and the axle of the magnetic particle testing
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A single driven gear or a single wheel, wheel spoke of the magnetic particle testing
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The wheel ring of the magnetic particle testing
Functions and Features
1. Circular magnetization (or the center conductor magnetization) using flexible electrodes, to ensure it is reliable to electrify and no ignition, magnetization is more stable
2. Longitudinal magnetic adopting silver-plated contacts with a strong locking clamp opening and closing coils, bonding is more reliable, and the performance is more stable;
3. Using the additional localized rotating magnetic field to meet the surface tangential magnetic field strength of gear tooth surface;
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For wheels magnetic particle flaw detector adopts the rotating magnetic field to reduce the degree of uneven distribution of magnetic field along the direction of the wheel radius;
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Using variable frequency drives to control the wheel rotation speed which can be freely set and achieve the dynamic commutation.
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Magnetizing current is controlled by a thyristor voltage regulator module, the current can be adjusted on the size of the work-piece;
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Magnetizing coil when power is attenuated by the non-equivalent measures to gradually decay current scheduled programs to zero, the system automatically in situ demagnetization process, the remanence of the testing piece is less than 0.3mT;
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The gantry structure of mainframe is suitable for the wheel pair detected through it, especially for matching the examining and repairing lines of wheel pair.
Main technical parameters
1. Magnetization mode: Compound Magnetic Field Local Rotating Magnetic Field
2. The peak value current of circular magnetization: 0-4800A continuously adjustable
3. Longitudinal magnetization MMF: 0-28000AT continuously adjustable
4.The distance of circular magnetic heads: 670-2500mm
5. The maximal weight of cantilever supporting work-piece: 3000kg
6. The maximal rotatory diameter of work-piece:1350mm
7. Demagnetization method: in situ decay
8. Detecting sensitivity: Clearly displays the artificial faults of A1 standard test piece 15／50
9. Residual Field: ≤0.3Mt