Expanding machine

The invention provides an expanding machine. The expanding machine comprises a rack, a drive mechanism on the rack, and an expanding mechanism on the rack, wherein the expanding mechanism comprises a first expanding part and a second expanding part which are arranged oppositely; and the drive mechanism is in drive connection with the first expanding part and/or the second expanding part, so that an expanding position where the first expanding part and the second expanding part move oppositely is formed between the first expanding part and the second expanding part. By application of the technical scheme, the problem that a knuckle is prone to being damaged during installation in the prior art is solved. 本发明提供了种张开机，包括：机架；驱动机构，设置在机架上；张开机构，设置在机架上，张开机构包括相对设置的第张开件和第二张开件，驱动机构与第张开件和/或第二张开件驱动连接，以使第张开件和第二张开件之间具有相对反向运动的张开位置。应用本发明的技术方案，以解决现有技术中在安装时易对转向节造成损伤的问题。