Anti-falling mechanism for horn gate stub bar in sliding block

The invention relates to an anti-falling mechanism for a horn gate stub bar in a sliding block, which comprises a lower template, the sliding block, a first gate insert, a gate ejector pin, a second gate insert and a gate secondary ejector pin, the sliding block is slidably connected to the lower template, the gate ejector pin is movably connected to the lower template, the first gate insert is connected to the sliding block, a horn gate is arranged in the first gate insert, and the gate secondary ejector pin is movably connected to the second gate insert. A forming hole is formed in the first sprue insert, the second sprue insert is connected to the lower end of the first sprue insert, the sprue secondary ejector pin is movably connected into the second sprue insert, the top end of the sprue secondary ejector pin is connected with a connecting part in the axial direction, the connecting part extends into the forming hole, and a reset mechanism is connected to the sprue secondary ejector pin. A through hole i