Stably-operating vertical machining center spindle box

The vertical machining center spindle box stable in operation comprises a first shell, the inner wall of the first shell is rotationally connected with a spindle through a bearing, the top of a containing plate is fixedly connected with a sliding block, one side of the outer wall of the sliding block is connected to a groove in the inner wall of the first shell in a sliding mode, and the outer wall of the sliding block is fixedly connected with a bearing. A lubricating mechanism is arranged at the top of the first shell; the lubricating mechanism comprises a second shell, an L-shaped rod, an inner threaded sleeve, a heating resistor, an oil baffle plate, an oil conveying pipe, a semi-ring spray head and a reciprocating lead screw. The utility model relates to the technical field of spindle box machining, oil mist spraying is achieved through cooperation of the spindle, the second shell and the semi-ring spray head, the service life is prolonged due to the fact that the oil mist can diffuse to any position, ne