The present invention relates to a method for raising operation speed of box-unloading machine and its mechanism. It is characterized by that before the box is unloaded, the proper quantity of water or other liquor is injected into at least a portion of empty containers in the box body, and then the box-unloading process can be started. The mechanism for injecting water or other liquor into emply containers in the turnover box is composed of injection head, pipe, and pump, collecting groove, liquor-supplementing device and controller. Besides, said invention also provides the concrete operation method of said mechanism. |