螺旋风管加工要求：

Machining requirements for spiral duct:

一、螺旋风管加工连接要求:

1. The requirements of the spiral wind pipe processing connection:

1）单壁螺旋风管直径≤600mm采用芯管插接加自攻螺丝连接方式，直径＞600mm采用角钢法兰连接。

1) the diameter of single wall spiral air duct is less than 600mm, and the core pipe plug and self tapping screw connection are adopted. The diameter is more than 600mm, and the angle steel flange connection is adopted.

2）双壁螺旋风管直径＜650mm采用机械法兰连接，直径≥650mm采用角钢法兰连接。

2) double wall spiral tube with diameter less than 650mm by mechanical flange connection, larger than 650mm in diameter with angle steel flange.

二、双壁螺旋风管加工一般规定:

Two, double wall spiral wind pipe processing generally stipulates:

1）外层螺旋风管镀锌板为热镀锌，其外层镀锌板厚度同单壁螺旋风管要求。

1) the outer spiral air duct galvanized sheet is hot-dip galvanized, and the thickness of the outer galvanized steel plate is the same as that of the single wall spiral pipe.

2）内层板为0.55mm厚的穿孔镀锌板，穿孔率应在30％以上。

2) the inner layer is 0.55mm thick perforated galvanized sheet, and the perforation rate should be over 30%.

3）中间保温层采用厚度为25mm、密度为32kg／m3的玻璃棉做保温吸声，外贴碳化无纺布。

3) the middle insulation layer is made of glass wool with a thickness of 25mm and a density of 32kg / m3 for thermal insulation and sound absorption.

三、单壁螺旋风管加工:

Three. Single wall spiral duct processing:

钢带架上装好成卷的薄钢带，薄钢带通过切断与焊接机构进入压制成型工作部分，成型工作头（专用模具）使通风管道按规定的管径锁缝成形。成型螺旋管沿成品架不断加工，向前延长，移动锯根据所需尺寸截取卷好的圆形螺旋通风管。然后从成品架上卸下放至成品区，按系统编好号。

The thin steel belt is loaded on the steel belt rack, and the thin steel strip enters the pressing forming part through the cutting and welding mechanism. The molding work head (special mold) makes the ventilation pipe forming according to the specified pipe diameter. The forming spiral pipe is continuously processed along the finished rack, extending forward, and the mobile saw can intercept the circular spiral ventilation pipe which is rolled up according to the required size. Then remove it from the finished rack and put it to the finished product area, and compile the number according to the system.