In order to meet the requirements of radiation protection, the size and weight of lead protective door are very large, which has different requirements of opening and closing transmission mechanism and door structure design from general doors. With the development of technology and radiation protection door and window manufacturing industry, the future will develop a high degree of automation, convenient maintenance, perfect safety precautions, high technology content of protective door, to meet the use and protection requirements.

铅防护门为避免焊接变形，焊接时应采用对称焊接（包含对焊、立焊、斜焊）；铅防护门焊接过程中逐道焊缝清渣，除飞溅物，发现存在缺陷问题及时用角向砂轮打磨，除去一些缺陷；铅防护门焊接工作结束，应将焊缝区及焊接管理工作位置场地清理干净，转移到下一焊接节点。

In order to avoid welding deformation, symmetrical welding (including butt welding, vertical welding and oblique welding) should be adopted during welding of lead protective door. Slag removal and spatter removal should be carried out for each welding seam during welding of lead protective door. If defects are found, angular grinding wheel should be used in time to remove some defects. After welding of lead protective door, the welding area and welding management work site should be cleaned and transferred to other places Next welding node.

采用铅作为防护材料的门板结构，电机直接影响带动主动轮在横梁上行走，门体重量主要作用在技术支撑轮上，采用传统单一的支承行走轮，主要特点是可避免支承铅门的导轨与被检测工件车导轨交叉，简化支承导轨的结构。这种结构模型适用于重量相对较轻的门体，射线铅防护门门体越重，对横梁的抗变形能力水平要求越来越高，使动力源部分的设计工作难度不断增大。

In the door panel structure with lead as protective material, the motor directly affects the driving wheel to walk on the beam, and the weight of the door body mainly acts on the technical support wheel. The traditional single support walking wheel is adopted. The main feature is that the guide rail supporting the lead door can avoid crossing with the guide rail of the workpiece car to be tested, and the structure of the support guide rail can be simplified. This structure model is suitable for the door body with relatively light weight. The heavier the door body is, the higher the requirement for the anti deformation ability of the beam is, which makes the design of the power source more difficult.

焊缝中不得有裂纹，焊缝金属应与母材完全熔合，所有缺口应填满，焊缝不得溢出，只有这样才能保证铅防护门的质量，线路不得泄漏或变形。门顶部设有警示灯，和门机连锁装置(即当门关上机器打开，门上的警示灯箱亮起)。

There should be no crack in the weld, the weld metal should be completely fused with the base metal, all gaps should be filled, and the weld should not overflow. Only in this way can the quality of the lead protective door be guaranteed, and the line should not leak or deform. The top of the door is equipped with a warning light and a door machine interlock device (that is, when the door is closed and the machine is opened, the warning light box on the door lights up).

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