As an intermediate link between the various functional components of the entire electronic system, the cable is widely used in aerospace or marine carrier platforms. It is distributed in a variety of working environments, and its performance is particularly stable. important. Because any solder joint with poor contact or low solder quality can have an unpredictable effect on the overall system. The cable is like the blood vessels and nerves of the human body. The main blood vessels and nerves of the human body have problems, which can lead to human death. The unreliable and unsafe cable will affect the function of the whole system.

In order to prevent moisture and dust, heat shrinkable sleeve protection is also required at the junction of the electrical connector and the cable. The selection of the heat shrinkable sleeve is selected according to the size of the connector of the electrical connector and the outer diameter of the cable. After the outer sleeve of the electrical connector is able to shrink a part of the cable, the length of the retracted cable is generally about twice the outer diameter of the cable. For example, a cable with a diameter of 6 cm, the heat shrinkable sleeve should be able to shrink the cable of about 10 cm.

After all the core wires have been welded, the spare wire is wrapped with a heat shrinkable sleeve. Tighten the tail cover, tighten the top wire, wrap several layers between the cable surface and the compression ring with insulation tape, take out the core wire shield or inner shield layer, make a cold rolling head at the end, and connect it to the pressure. Fasten the screws on the two ends of the compression ring and tighten the screws on the ends of the compression ring. After the tail cover is good, it should be fastened to the cable without shaking. Retract the heat shrink tubing to the highest position that does not prevent the outer nut from rotating, and the other to wrap the cable at least twice as long as the cable diameter. If the diameter of the cable is too thin, and the tail structure of the electrical connector is large, and the cable cannot be shrunk after the tail is tightened, then a relatively thin heat-shrinkable sleeve is tightened on the previous heat-shrinkable sleeve. The tail is tightly integrated with the cable. Finally, the cable identification is shrunk 5 cm away from the tail of the heat shrinkable sleeve or the tail of the electrical connector. When heat shrinking, pay attention to the position of the word on the cable and the position of the electrical connector No. 1, that is, on a horizontal plane. Moreover, it is best to use a heat gun to blow from the back side of the mark when heat shrinking, so that the heat-shrinked mark font will not shrink too much and cause unclearness, which is difficult to recognize.

The heat shrinkable sleeves referred to herein are divided into two broad categories.

One type of material used to protect the electrical connector from the cable is the inner wall with a hot sol. The glued heat shrinkable sleeve heats the inner wall of the rubber and melts. After cooling, it has a good moisture-proof effect. hardness.

One type is a heat-shrinkable sleeve with no glue on the inner wall. It is soft after heat shrinking. One of them is a tape-type package, which can be printed as a marker sleeve. One is a transparent heat shrink tubing used to protect the cable identification, often used to identify protective sleeves. There is also a tip protection that can be used as a backup wire and a tip shield for the core shield.

The use of the heat shrinkable sleeve should fully consider the size before and after the heat shrinkage, that is, it must be selected to be slightly larger than the size of the package before heat shrinking, and the size after heat shrinking must be smaller than the total outer diameter of the package, so as to ensure heat shrinkage. The effect of the use of the casing.

                                               热缩套管在电缆焊接上的应用

电缆作为连接着整个电子系统的各个功能部件的中间环节，无论是在航空航天领域，还是海上舰载平台都被大量的使用着，分布在各种各样的工作环境中，其性能的稳定尤为重要。因为任何一个接触不良或焊接质量不高的焊点都会对整个系统产生不可估计的影响。电缆犹如人体的血管和神经，人体的主要血管和神经出现问题，会导致人的死亡，而电缆的不可靠不安全，会影响整个系统的功能实现。

为了防潮防尘还要在电连接器与电缆连接处热缩一层热缩套管保护，热缩套管的选择要根据电连接器尾附件的尺寸和电缆的外径来选取，长度要从电连接器的外螺套之后到能够缩住一部分电缆，缩住的电缆长度一般有电缆外径的2倍左右即可。比如直径6cm的电缆，热缩套管要能缩住10cm左右的电缆。

当所有芯线焊接完之后，备用线用热缩套管把端头包起来。将尾罩旋紧，顶丝紧固，将电缆表面与压紧环之间用绝缘缠带包裹几层，将芯线屏蔽层或内屏蔽层引出，端头做一个冷轧头，连接在压紧环的一个螺钉上，再将压紧环上两端的螺钉紧固，弹垫压平。尾罩上好之后应与电缆连接紧固，不晃动。将热缩套管缩到不妨碍外螺套旋转的最高位置，另一段要包裹住电缆最少不短于2倍电缆直径的位置。如果电缆直径过细，而电连接器的尾部结构尺寸较大，尾部缩紧了之后还不能把电缆缩住，那么就要加缩一个相对较细的热缩套管在上一个热缩套管的尾部，将其与电缆紧密结合。最后将电缆标识缩在距离热缩套管尾部或电连接器尾部5cm处，热缩时注意将电缆标识有字的一面与电连接器1号的位置保持一致，即在一个水平面上。而且热缩时最好用热风枪从标示的背面吹，这样热缩出来的标示字体不会缩小太多而导致不清晰，不好辨认。

本文中涉及的热缩套管分两大类。

一类用来保护电连接器与电缆连接处用的是内壁带热溶胶的，这种带胶的热缩套管加热后内壁的胶会融化，冷却之后有很好的防潮作用，有一定的硬度。

一类是内壁不带胶的热缩套管，热缩后比较柔软，其中一种是编带型包装的，可打印标记，作为标识套管使用。一种是用来保护电缆标识的透明热缩套管，常常用于标识保护套管。还有一种就是可用来做备用线的端头保护和芯线屏蔽层的端头保护。

热缩套管的使用要充分考虑热缩前后的尺寸，也就是说在选用的时候必须要选热缩前略大于包裹物尺寸，热缩后尺寸必须小于包裹物总外径，这样才能确保热缩套管的使用效果。