目前,市场上所销售的圆板牙板手如附图所示。我们发现用该结构的板手铰制外螺纹时,往往铰到一半就卡死或铰扭曲,其原因是圆板牙与螺纹中心不垂直。针对这个问题,我们在原结构的基础上加一个导向套(见下图)。导向套与本体的连接可以采用螺纹,也可采用焊接。 At present, the market for the sale of the circular plate hand as shown in the figure. We found that with this structure the wrench hinges on the external thread, it is often hinged half to jam or hinge twist, because the circular tooth is not perpendicular to the center of the thread. In response to this problem, we add a guide sleeve to the original structure (see below). Guide sleeve and the body can be used to connect the thread, but also the use of welding.