The utility model relates to the technical field of fixing devices, and discloses a fixing device for
processing a high-
toughness flame-retardant
thermal insulation pipe, which comprises a base, a clamping mechanism is arranged at the top of the base, and an adjusting mechanism is arranged in the clamping mechanism. A
pipe is placed between the two clamping blocks, then the motor is started, the two-way screw on the left side above the base rotates, the two-way screw on the right side above the base rotates through cooperation of the first belt wheel, the belt and the second belt wheel, and therefore the two-way screws can rotate at the same time through work of the motor; the two-way screw rotates to enable the two moving blocks to move in the opposite directions, the two clamping blocks further move in the opposite directions to clamp and fix the pipes, the pipes are clamped by the two-way screw more stably, the phenomenon of shaking is avoided during
machining, and the pipes with different diameters can be adjusted through the adjusting mechanism.