1. Steel Ring: The steel ring is made of 45 cold-drawn steel wire. It is stamped several times by cold punching die. The steel ring has several specifications and sizes, which are arranged in combination to meet the needs of installed window sizes.

二、轨道：上下轨道均为统一专用型材，其材质为2mm厚的冷带钢（Q235），经专用拉轧设备，拉出外型尺寸30×30,中间为8mm等距离槽口的型材。

Track: Both upper and lower rails are uniform special profiles, which are made of cold strip steel (Q235) with thickness of 2 mm. Through special drawing and rolling equipment, profiles with size of 30 *30 and 8 mm equal distance grooves in the middle are drawn out.

三、侧板：锁芯杆、小扣板等均为专用型材，材质为不同厚度（1.5-1.8mm）的冷带钢（Q235），经专用拉轧设备，拉出不同尺寸，不同规格的型材。

3. Side plate: lock rod and small button plate are all special profiles. The material is cold strip steel (Q235) with different thickness (1.5-1.8mm). Through special drawing and rolling equipment, profiles of different sizes and specifications are drawn out.

四、锁：为专用特制锁，锁芯为国标锁芯，锁结构形式采用上下双方向撞锁（即上下两个锁舌）二锁舌之间不互动，外力撬动一锁舌，另一锁舌不动，锁扣放置在一侧板内，锁舌与锁扣互扣上，隐藏在侧板与锁芯板内，外观无法察看到锁舌与锁扣相扣的位置。

4. Lock: For special lock, the lock core is the national standard lock core. The structure of the lock adopts the non-interaction between the upper and lower sides of the collision lock (i.e. the upper and lower two lock tongues) and the second lock tongue. The external force leverages one lock tongue, and the other lock tongue does not move. The lock tongue is placed in one side plate. The lock tongue and the lock tongue are interlocked and hidden in the side plate and the lock core plate. The position of the lock tongue and the lock tongue can not be observed in appearance.

五、锁杆、支杆：为钢管经冲压成型，支杆的作用为固定钢环连接点。采用圆管式支杆，可防护窗的外观呈现得更加牢固，更加美观。

5. Lock rod and support rod: The steel pipe is stamped and formed, and the support rod is used to fix the connection point of steel ring. The use of circular pipe support can make the appearance of the protective window more solid and beautiful.

六、各种链扣，用来连接固定钢环，使钢环转动灵活，折叠关闭得以实现，并且在各组钢环连接点采用不同形式链扣，用大功率点焊机连接，使之各结合点更牢固。

6. Various kinds of links are used to connect the fixed steel rings, so that the steel rings can rotate flexibly and fold and close, and different types of links are used at the connection points of each group of steel rings, which are connected by a high-power spot welding machine to make the connection points more firm.

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