矩形消防风管自动缝合机设计及实验

消防风管是建筑物用于排烟、通风的重要部件之一。目前矩形风管的侧面缝合工序采用人工敲打方式,其效率低,劳动强度大,亟需一种可以实现自动缝合的设备完成该工序的生产。针对矩形风管规格多,管体刚性差,管壁薄易变性的特性,提出了双头定位,双头液压驱动轮滚压的自动化缝合方案。采用缝合边的两直角端进行定位和装夹,解决了需要多规格工装以及加工时频繁更换工装的问题;采用液压双头夹持并支撑滚压面,有效增加了风管的刚度,解决了风管在滚压时发生变形的问题;滚压头使用渐变四轮设计,减小被压面压力,保证一次缝合成型且风管缝合过程中风管不变形。样机实验结果表明,风管自动缝合机能够满足不同规格的风管侧边缝合工艺要求,加工时间小于1 min,效率提高80%以上。

Design and experiment of the automatic sewing machine for rectangular fire ventilation pipe

Fire ventilation pipe is one of important parts of building for smoke exhaust and ventilation. At present, sewing the two sides of the rectangle fire ventilation pipe by manual operation brings to low efficiency and high labor intensity. Therefore, it is necessary to finish automatically the process with machines. However, the rectangular fire ventilation pipe has many characteristics, including various?sizes, poor body stiffness and easy deforming of thin wall, which lead to the difficulty to sew automatically the pipe. In order to solve the problem of automatic sewing fire ventilation pipe, a method is proposed that sews the two sides of fire ventilation pipe with hydraulic double heads and double rolling heads driven by hydraulic mechanism. The two right angle ends of the stitching edge are used for positioning and clamping, which solves the problem of requiring multi specification tooling and frequent replacement of tooling during processing; Hydraulic double ends are used to clamp and support the rolling surface, which effectively increases the stiffness of pipe and solves the problem of deformation of the fire ventilation pipe during rolling; The rolling head uses a gradual four-wheel design to reduce the pressure on the pressed surface and ensure that the fire ventilation pipe is not deformed during one -time sewing. The experimental results of the prototype show that the automation can meet the side sewing process requirements of fire ventilation pipes of different specifications, the processing time is less than 1 minute, and the efficiency is improved by more than 80%.