Self-centering ejector pin device of cylindrical grinding machine

The utility model discloses a self-centering ejector pin device of a cylindrical grinding machine. The inner ball cage mainly solves the problem that an existing inner ball cage is difficult to position during chamfering. The device is characterized in that a power source (2) and a core (3) are arranged in the shell, the core (3) is driven by the power source to move front and back, a movable groove (10) is formed in the shell in a penetrating mode, a plurality of lifting ejector pins (4) are arranged in the movable groove, and the core is used for driving the ejector pins to rise to abut against the inner wall of a universal joint bell housing when moving. According to the self-centering ejector pin device of the cylindrical grinding machine, a part to be ground is tightly supported through the ejector pin, the center of an outer ball cage is very convenient to position, machining procedures are reduced, and machining efficiency is greatly improved. 一种外圆磨床自定中心顶针装置。主要解决目前的现有的内球笼在倒角时较难定位的问题。其特征在于：所述壳体内设有动力源(2)