In some vegetable growing areas, the author often finds that because the support bar is not maintained in time, there are a lot of rust eyes. After the rainwater enters the steel pipe, it erodes from the inside, and gradually the welding site is broken. At the same time, due to poor maintenance, the rust falling from the support rod seriously pollutes the shed film, leading to premature aging of the shed film.
So, how to maintain the support bar? First of all, the rust polished after spraying anti-rust paint, when grinding should always pay attention to whether there are rust eyes and cracks, if there is to be repaired in time.
In addition, because the supporting pole of the bridge shutter is fixed, the tripod driving the head of the shutter is often severely worn or even deformed due to the running of the blind. Therefore, check this after you have maintained the support bar.
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