The utility model discloses a fragile problem when solving the transport of precipitation non -sand tubular well designs a downcomer transport fixture, a serial communication port, include: clamp, reinforced rib board, eccentric wheel, activity ring, handle, positioning bayonet lock, hinge, the clamp includes first clamp and second clamp, have on the clamp the reinforced rib board, have on the first clamp the axis of rotation, have on the second clamp positioning bayonet lock, the eccentric wheel is connected the loose axle with positioning bayonet lock, the eccentric wheel is connected the activity ring, the activity linkage connects the handle, hinge hinge first clamp with the second clamp, the handle reciprocates the drive the eccentric wheel rotates and changes first clamp with distance between the second clamp. Compared with the prior art, the technique of this application is compared the institute and is had with prior art: process principle is simple, and the operation is stablized laborsavingly, and complete equipment can have enough to meet the need advantages such as use, security performance height for a long time.