Double-pipe water-cooled anti-drawing sprue sleeve

Abstract

The invention discloses a two-pipe type water-cooling and anti-drawing sprue bush. An outer pipe (3) is arranged outside a sprue casing pipe (1), wherein a cavity with two sealed ends is formed between the wall of the outer pipe (3) and the wall of the sprue casing pipe (1); a water outlet baffle (6) is arranged at a water outlet (5); a water outlet channel (8) is formed between the water outlet baffle (6) and the wall of the outer pipe (3) with the water outlet (5); a distance is formed between the bottom of the water outlet baffle (6) and the bottom of the outer pipe (3); the thickness of the bottom pipe wall of the sprue casing pipe (1) is less than the top pipe wall of the sprue casing pipe (1). Cold water enters the cavity through a water inlet, then enters the water outlet channel through communication of the lower end of the water outlet baffle and flows out through the water outlet; the cold water can flow into the cavity from the upper end of the cavity; the cold water which absorbs excessive heat at the bottom of the cavity flows out of the water outlet channel, so that a good cooling effect is achieved; meanwhile, the service life of the sprue brush is not influenced on the promise of preventing drawing.

Description

technical field [0001] The invention relates to the technical field of moulds, in particular to a double-pipe water-cooled anti-drawing sprue sleeve. Background technique [0002] The sprue sleeve injects the molten plastic material from the nozzle of the injection molding machine into the mold, and is used to connect the molding mold and the metal fittings of the injection molding machine. Since the molten plastic material flows through the sprue sleeve, heat is transferred to the sprue sleeve, and the pouring The sprue sleeve is continuously heated, and the sprue sleeve is prone to overheating and cracking, which affects the service life of the sprue sleeve; at the same time, in order to prevent the sprue sleeve from overheating and cracking, in the prior art, the sprue sleeve prevents overheating and cracking by increasing the wall thickness. In this way, the wire drawing phenomenon is serious when the sprue sleeve is separated from the mold. [0003] Patent 203449552 di...

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Problems solved by technology

[0002] The sprue sleeve injects the molten plastic material from the nozzle of the injection molding machine into the mold, and is used to connect the molding mold and the metal fittings of the injection molding machine. Since the molten plastic material flows through the sprue sleeve, heat is transferred to the sprue sleeve, and the pouring The sprue sleeve is continuously heated, and the sprue sleeve is prone to overheating and cracking, which affects the service life of the sprue sleeve; at the same time, in order to prevent the sprue sleeve from overheating and cracking, in the prior art, the sprue sleeve prevents overheating and cracking by increasing the wall thickness. In this way, the wire drawing phenomenon is serious when the sprue sleeve is separated from the mold

[0003] Patent 203449552 discloses a mold sprue sleeve. By setting a number of cooling grooves on the outer surface of the sprue sleeve, the heat dissipation effect of the sprue sleeve is increased and the service life of the sprue sleeve is extended. However, only the surface of the sprue sleeve itself Heat dissipation, slow heat dissipation, poor heat dissipation

[0004] Patent 203495175 discloses a new type of sprue bushing structure for high-pressure casting molds. In the present invention, a plurality of bosses arranged from top to bottom are arranged on the outer wall of the sprue bushing, so that a cooling system for cooling water circulation is formed between the bosses. The water channel, by injecting cooling water into the water-separating jacket, ensures that the cooling water circulates in the same direction, and reduces the temperature of the sprue bushing through the cooling water. However, the cooling water of this structure is arranged in a spiral shape around the sprue bushing In the water-separating jacket of the pipe wall, the contact area between the sprue sleeve and the cooling water is limited, and the radius of the water-separating jacket is small, which is easy to block the water-separating jacket and requires high cooling water

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