Chain tongs structure of thin film stretching production line

The invention provides a chain tongs structure of a thin film stretching production line. The inner and outer sides, containing a guide rail, of a tongs body are respectively and fixedly provided with one or two upper side bearings, outer rings of which are tangent with the side face of the guide rail, and the tongs body is further provided with a top bearing, an outer ring of which is tangent with the top face of the guide rail; corresponding lower side bearings are respectively mounted below the upper side bearings and on the inner and outer sides of the bottom of the tongs body; a tooth groove is formed in a film clamping face of a tongs handle; the tongs body is divided into a supporting base and an upper tongs body above the supporting base, and the supporting base and the upper tongs body are fixedly connected with each other through positioning pins and long screws; a tongs handle is mounted on the upper tongs body; the upper side bearings and the top bearing are fixedly mounted on the upper tongs body; the lower side bearings are fixedly mounted above a lower plate of the supporting base; and all the bearings are same rolling bearings and are symmetrical with one another along the guide rail. According to the chain tongs structure, the rolling bearings are arranged on the contact faces between the tongs body and the guide rail to form a movable pair, so that the friction between chain tongs moving at a high speed and the guide rail is reduced greatly and the abrasion of the guide rail is alleviated; the chain tongs can run stably at a high speed by virtue of the bearings on the two sides of and above the guide rail; and the split tongs body is easy to assemble and disassemble as well as maintain.