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The tremor in the work of the active gate is mainly caused by the length of the gate rod is not proportional to the tension of the tension spring. At this time, if we see that the lower rod will not tremble, then the rod will not tremble at the start, which means that the tension of the tension spring is too strong. If the tension of the tension spring is loosened, the upper rod will not tremble but the lower rod will not tremble. If the tension of the tension spring is lacking , It is necessary to tighten the tension spring or replace the tension spring to deal with.