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.

鉛防護門為避免焊接變形，焊接時應采用對稱焊接（包含對焊、立焊、斜焊）；鉛防護門焊接過程中逐道焊縫清渣，除飛濺物，發現存在缺陷問題及時用角向砂輪打磨，除去一些缺陷；鉛防護門焊接工作結束，應將焊縫區及焊接管理工作位置場地清理幹淨，轉移到下一焊接節點。

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.

采用鉛作為防護材料的門板結構，電機直接影響帶動主動輪在橫梁上行走，門體重量主要作用在技術支撐輪上，采用傳統單一的支承行走輪，主要特點是可避免支承鉛門的導軌與被檢測工件車導軌交叉，簡化支承導軌的結構。這種結構模型適用於重量相對較輕的門體，射線鉛防護門門體越重，對橫梁的抗變形能力水平要求越來越高，使動力源部分的設計工作難度不斷增大。

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.

焊縫中不得有裂紋，焊縫金屬應與母材完全熔合，所有缺口應填滿，焊縫不得溢出，隻有這樣才能保證鉛防護門的質量，線路不得泄漏或變形。門頂部設有警示燈，和門機連鎖裝置(即當門關上機器打開，門上的警示燈箱亮起)。

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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