Pull-assisting device and combined case

The invention provides a pulling assisting device and a combined case. The pulling assisting device comprises a case, a transmission mechanism, a driving part and an ejector rod. The ejector rod is in sliding connection with the machine shell, and the driving piece is movably connected with the machine shell and the transmission mechanism. The transmission mechanism is used for driving the ejector rod to slide when the driving piece rotates relative to the machine shell. The ejector rod is used for being inserted into a supporting hole in the target case so as to provide upward supporting force for the target case and abutting against the target case when the driving piece moves relative to the case so that the target case can move in the direction away from the case. According to the invention, when the target case and the expansion case are butted or separated, the damage of the gravity of the target case or the expansion case to the internal connector can be prevented. 本发明提供一种助拔装置和组合机箱，其中助拔装置包括：机壳、传动机构、驱动件