Open type hot runner injection mold device

Abstract

The invention discloses an open type hot runner injection mold device. The open type hot runner injection mold device comprises a mold cavity, an injection nozzle, a hot runner plate, a supporting ring and a back plate which are installed from bottom to top in sequence; the hot runner plate and the injection nozzle are internally provided with a hot runner, and the hot runner sequentially penetrates through the hot runner plate and the injection nozzle to communicate with the interior of the mold cavity; the outer side of the injection nozzle is provided with a heating plate and a heat insulation gasket, and the heating plate and the heat insulation gasket are connected to the outer wall of the injection nozzle in a sleeving mode; the mold cavity is separated from the heating plate throughthe heat insulation gasket; the outer side of the supporting ring is sleeved with a spring gasket; and one end of the spring gasket is connected with the supporting ring, and the other end of the spring gasket is connected with the back plate. According to the open type hot runner injection mold device, the hot runner plate and the heating plate are both provided with heating pipes, thus, the temperature of the hot runner is controlled more precisely, the temperature difference change of plastic is small, meanwhile, the hole diameter of the injection nozzle is increased, the length is decreased, the viscosity of the plastic is improved, and the problem that a bottle blank becomes white and is subjected to wire drawing is effectively solved.

Description

technical field [0001] The invention belongs to the field of preform injection molds, in particular to an open hot runner injection mold device. Background technique [0002] The hot runner injection mold device is a key part of the injection mold, and its function is to inject the pressurized sol in the injection machine into the mold cavity through the hot runner, and heat-preserve or heat the sol flowing through the hot runner. The hot runner injection mold device will directly affect the quality of preform molding, such as the hot runner injection mold device used by our company before the formation of this improvement plan, such as Figure 7 As shown, it includes the cavity, nozzle, hot runner plate, support ring and back plate installed in sequence from bottom to top. The heat pipe is set on the hot runner plate, the hot runner is set on the hot runner plate and the nozzle, and one end of the hot runner There are copper plugs for sealing, and the hot runner injection m...

AI Technical Summary

Problems solved by technology

[0003] 1. The bottom of the preform is prone to whitening and wire drawing, which seriously affects the pass rate of product production;

[0004] 2. There is no heat pipe for temperature control in the long section of the hot runner through which the sol passes through the nozzle, which makes the temperature of the hot runner inaccurate and difficult to debug;

[0005] 3. The copper plug at the end of the hot runner is prone to corrosion and glue leakage;

[0006] 4. After the support ring is worn due to thermal expansion and contraction, it is easy to cause the hot runner to loosen and cause glue leakage;

[0007] 5. The hot runner inside the nozzle is long, making it difficult to clean the inner hole;

[0008] 6. The nozzle is easily damaged during use;

[0009] 7. Before injection molding, it is necessary to use an air tank to heat the copper wire to carry out the glue flow operation on the hot runner. It is difficult for the copper wire to penetrate into the hot runner, which is very inconvenient to use and poses a safety hazard.

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