Flexible transfer trolley for octagonal tube grippers

The invention relates to a flexible transfer trolley for octagonal tube grippers. The transfer trolley comprises four transfer legs; each transfer leg is formed through connection of a clamping arm, acontact plate, a clamp, a pin with a hole, an upper plate, corner brackets, a supporting column, a lower plate and a castor; the contact plates are mounted on the clamping arms; the clamping arms arehinged to supporting blocks through the pins with the holes; the supporting blocks are mounted on the upper surfaces of the upper plates; the lower surfaces of the upper plates are connected with theupper sides of the supporting columns through the corner brackets; clamp mounting plates are mounted on the side surfaces of the upper plates; the clamps are arranged on the clamp mounting plates; the upper surfaces of the lower plates are connected with the lower sides of the supporting columns through the corner brackets; and the castors are arranged on the lower surfaces of the lower plates. According to the transfer tr