Idlers not only facilitate the replacement of idlers, but also involve deflector idler brackets, supports, pins, fuselage, idlers, limit blocks and fasteners. The lower end of the support is connected with the upper end of the fuselage by fasteners, and the support is connected with the deflecting roller support by a pin. The deflecting roller support is provided with a clamping groove rotating around the pin shaft, and the deflecting roller support is arranged in the clamping groove, and the deflecting roller support is provided with a limit block controlling the deflection Angle. There is a pin on the bracket or body for deflecting the idler bracket around which it rotates.
