加工头机械装置除了固定光学元件外，其内部均设计有用于冷却水循环的水冷通道。各模块的冷却水通过外部软管进行串联连接，可以有效带走加工头内部产生的大部分热量，进而保护光学元件不受损伤。除此之外，加工头下端设置有保护气通道，用于冷却聚焦单元的保护镜片，第一版加工头原理样机完成装配后如

图a)所示。

在完成加工头装配后，需要对加工头的水冷系统进行密封性测试，避免加工头在工作时冷却水内溢。图b)为加工头的密封性测试装置，将加工头与冷水机通过软管相连，在确定各管道和接口连接牢固后，打开冷水机并持续循环30min，期间观察各连接口、入光口、出光口是否有液体渗出。经检查，加工头水冷系统工作正常，加工头整体密封性优异。

In addition to the fixed optics, the machining head mechanism is designed with internal water cooling channels for cooling water circulation. The cooling water of each module is connected in series through external hoses, which can effectively take away most of the heat generated inside the machining head, thus protecting the optical components from damage. In addition, there is a protective air channel at the lower end of the processing head for cooling the protective lens of the focusing unit. The first version of the processing head principle prototype after completion of assembly is shown in

The first version of the prototype is shown in Figure a).

After completing the assembly of the processing head, the water cooling system of the processing head needs to be tested for hermeticity to avoid the internal overflow of cooling water when the processing head is in operation. Figure b) shows the sealing test device of the machining head. The machining head is connected to the water chiller through a hose, and after making sure that the pipes and interfaces are firmly connected, the water chiller is turned on and circulated continuously for 30 min, during which the liquid is observed to be oozing out from the connection ports, light inlet ports and light outlet ports. After inspection, the water cooling system of the processing head worked normally and the overall sealing of the processing head was excellent.