The invention provides a double-cone-shaped main runner
sprue bushing. The double-cone-shaped main runner
sprue bushing comprises a first runner splice block, a second runner splice block, a first splice block screw, a second splice block screw, positioning pins, plywood fastening screws, a spherical crown
nozzle surface, a first cone-shaped main pouring runner, a second cone-shaped main pouring runner and an injection molding inlet. A single edge of the first runner splice block of the
sprue bushing is composed of the first cone-shaped main pouring runner, the second cone-shaped main pouring runner and the injection molding inlet, and the spherical crown
nozzle surface is used for being in
butt joint with a spray
pipe nozzle ball of an
injection molding machine. By the adoption of the double-cone-shaped main runner sprue bushing, the requirement for forming an eccentric pouring main runner on a mould is met; compared with a traditional oblique sprue bushing, materials can flow more smoothly when injection molding is conducted in the main runner, the requirements for pouring of two independent runners can be met at the same time, pressure losses are small,
machining is easy, material discharging is smooth, and mould production cost and product injection molding cost are reduced; the structural design is reasonable, working is stable, both safety and reliability are guaranteed, and using is convenient.