论文部分内容阅读
针对目前北京地区大多数钢架西甜瓜大棚采用底部、腰部或顶端调整棚膜通风换气效果差,操作困难,浪费劳动力,易造成棚膜损伤的实际问题,北京市农业技术推广站研制了一种“天窗”型钢架大棚放风装置。近日,该装置获得实用新型专利授权,专利号为ZL2014 20768850.1。据介绍,该装置主要由窗框、窗框上铰接的窗扇及操作窗扇的纵向推杆
In view of the fact that most of the steel cane melon sheds in Beijing use the bottom, the waist or the top to adjust the ventilation effect of the scaffold membrane, the operation is difficult, the labor is wasted, and the damage of the shed film is easily caused. The Beijing Agricultural Technology Extension Station has developed a Species “skylight ” steel shed ventilation device. Recently, the device obtained utility model patents, patent No. ZL2014 20768850.1. According to reports, the device mainly by the window frame, sash hinges hinged on the operation of the sash and the vertical push rod