CN216300022U

CN216300022U - Hot runner nozzle without additional heating device

Info

Publication number: CN216300022U
Application number: CN202123030495.7U
Authority: CN
Inventors: 徐世辉
Original assignee: Anhui Skyship Stationery Technology Co ltd
Current assignee: Anhui Skyship Stationery Technology Co ltd
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2022-04-15
Anticipated expiration: 2031-12-06

Abstract

A hot runner nozzle without an additional heating device comprises a main sprue fixing plate, a mould body, a nozzle body, a liquid flow channel and a nozzle sheath, wherein the nozzle body is connected with a liquid flow channel of a plastic spraying machine, a heating device is arranged on the nozzle body, the heating device ensures that plastic liquid in the liquid flow channel is in a molten state, and the nozzle sheath is arranged outside the nozzle body; the nozzle body and the nozzle sheath are both arranged on the main sprue fixing plate.

Description

Hot runner nozzle without additional heating device

Technical Field

The invention relates to a hot runner nozzle, in particular to a hot runner nozzle without an additional heating device.

Background

Hot runner molds, also known as runnerless cure molds, have been used in thermoplastic injection molds for over 30 years. It is estimated that there are currently over 1/4 injection molds that use hot runner technology in europe and over 1/6 in the united states. At present, hot runner system components are serialized and commercialized.

In the hot runner, a heater is arranged in or around the runner, so that the plastic melt in the runner is always in a molten state. The hot runner system consists of two basic units, namely a branch runner plate and a nozzle. The runner plate is mounted on the stationary mold part and transfers melt from the nozzle of the injection machine to the cavity plate, and the hot nozzle transfers the melt directly to the cavity or indirectly supplies a plurality of cavities through a cold runner. The nozzle is arranged on the fixed die part, and the end face of the nozzle is in right angle with the cylindrical bus thereof, has no chamfer transition and forms an angle of 90 degrees with the diversion passage plate. The heater is arranged at the front end of the nozzle. In the hot runner mold, a runner is connected with a runner in a molten state and a product to be solidified respectively, and the temperature difference between the runner and the product is more than 100 ℃. The melt is required to pass smoothly during injection, and the sprue is quickly closed during die opening so as to avoid melt leakage.

The heater comprises a hollow flow passage butted with the nozzle, a heating coil arranged outside the flow passage and a protective copper ring outside the coil. In order to keep the temperature of the heater constant, a temperature controller and a wire connecting the temperature controller and the heater must also be provided. In order to prevent the wires from protruding out of the fixed mold part, a wire slot needs to be formed in the fixed mold part, and therefore the manufacturing cost of the mold is increased. In addition, the runner of the heater is currently used as a standard part, the end part of the runner is in a cylindrical shape without a chamfer angle, the runner of the fixed die part is matched with the die in the processes of die opening and die closing, but the runner is also abraded and even broken by impact in the process of multiple movements and after the guide rail of the die is abraded. The replacement is needed, a great deal of manpower and financial resources are consumed, and the production period is delayed.

After one working cycle, the heater is switched off, and the molten plastic in the heating coil is cooled and solidified, so that in the next working, the heater is required to be switched on, the cooled and solidified plastic is heated to a molten state again, and then the plastic is extruded by the molten liquid in the nozzle. This both prolongs the preparation time and wastes raw materials.

Disclosure of Invention

In order to solve the technical problems mentioned in the background art, such as the increase of the manufacturing cost of the mold and the easy damage of the runner, the invention provides a hot runner nozzle without an additional heating device.

Preferably, the nozzle sheath comprises a sheath upper cavity, a sheath lower cavity, a spraying cavity, a sealing surface, a positioning surface and a transition surface, wherein the sheath upper cavity, the sheath lower cavity and the nozzle are matched, and the spraying cavity corresponds to the liquid flow channel.

Preferably, the ratio of the length to the diameter of the outer contour of the nozzle body is 1:1.2 to 1: 5.

Preferably, the ratio of the length to the diameter of the lower nozzle cavity is 1:1.2-1: 5.

Preferably, a spherical sealing surface is arranged at the upper section of the injection cavity, and the periphery of the liquid flow passage of the nozzle body is completely contacted with the periphery of the injection cavity of the nozzle sheath by the sealing surface, so that the molten plastic in the liquid flow passage can completely enter the injection cavity.

Preferably, a positioning surface is arranged at the upper section of the sealing surface, and the positioning surface positions the nozzle body.

Preferably, a transition surface is arranged between the positioning surface and the lower cavity of the sheath.

Preferably, the ratio of the length to the diameter of the inner bore of the liquid flow channel is 15-20.

Preferably, the end of the lower cavity of the nozzle is provided with a conical surface, the section angle of the conical surface is 60-120 degrees, and the ratio of the upper section diameter to the lower section diameter of the conical surface is 2.5: 1-1.5: 1.

preferably, the heating device is an electric heating device, a power supply lead of the heating device is arranged on the plastic spraying machine, and a lead groove is not arranged on the main gate fixing plate.

The diameter of the section of the conical surface of the injection cavity, which is directly contacted with the liquid flow channel, is slightly smaller, the diameter of the section far away from the liquid flow channel is slightly larger, and the taper of the conical surface is 1.23.

Drawings

Fig. 1 is a schematic view of a main gate fixing plate (provided with a main gate heating line slot) in the prior art.

FIG. 2 is a schematic view of the mating of the via plate on the main gate with the nozzle boot of the present invention.

FIG. 3 is a schematic view of the mating of the lower primary gate orifice plate with the nozzle boot of the present invention.

Fig. 4 is a top view of the inventive flow field plate in cooperation with a nozzle boot.

Fig. 5 is a perspective view of the nozzle plate of the present invention in cooperation with a nozzle boot.

FIG. 6 is a cross-sectional view of a nozzle boot of the present invention.

FIG. 7 is a perspective view of a nozzle boot of the present invention.

FIG. 8 is a schematic view of a main gate retaining plate of the present invention.

In the figure: 1-main gate fixing plate, 2-main gate upper orifice plate, 3-nozzle sheath, 4-main gate heating line slot, 5-main gate lower orifice plate, 6-runner plate, 61-runner, 301-sheath upper cavity, 302-sheath lower cavity, 303-injection cavity, 304-sealing surface, 305-positioning surface, 306-transition surface and 307-conical surface.

Detailed Description

In order to more clearly illustrate the present invention, embodiments of the present invention are further described below with reference to the accompanying drawings.

A hot runner nozzle without an additional heating device comprises a main sprue fixing plate, a main sprue upper perforated plate, a nozzle sheath, a main sprue lower perforated plate, a runner plate, a nozzle body, a liquid runner and a nozzle sheath, wherein the nozzle body is connected with a liquid flow channel of a plastic spraying machine, a heating device is arranged on the nozzle body, the heating device ensures that plastic liquid in the liquid runner is in a molten state, and the nozzle sheath is arranged outside the nozzle body; the nozzle body and the nozzle sheath are both arranged on the main sprue fixing plate.

Further, the nozzle body is inserted into the nozzle sheath, so that the amount of heat generated from the molten plastic liquid can be reduced, and at the same time, an additional heating coil, a temperature controller, and a wire connecting the heating coil and the temperature controller are eliminated. The price of the whole set of equipment, namely the heating coil, the temperature controller and the lead is thousands of yuan, so that the cost is greatly saved. In addition, the wire grooves are prevented from being arranged on the main sprue fixing plate, the process for machining the wire grooves is omitted, and the cost is greatly saved.

In order to increase the structural rigidity of the nozzle sheath and meet the requirement of the nozzle sheath on matching with a nozzle body, preferably, the nozzle sheath comprises a sheath upper cavity, a sheath lower cavity, a spraying cavity, a sealing surface, a positioning surface and a transition surface, wherein the sheath upper cavity and the sheath lower cavity are matched with the nozzle, and the spraying cavity corresponds to the liquid flow channel.

Preferably, the ratio of the length to the diameter of the outer contour of the nozzle body is 1:1.2 to 1:5, in particular, the ratio is 1:1.2 or 1: 1.3 or 1: 1.4 or 1: 1.5.

preferably, the ratio of the length to the diameter of the lower nozzle cavity is 1:1.2 to 1:5, specifically, the ratio is 1:1.2 or 1: 1.3 or 1: 1.4 or 1: 1.5.

Preferably, the ratio of the length to the diameter of the inner bore of the liquid flow channel is 15-20, in particular 15, 16, 17, 18, 19 or 20.

Preferably, the end of the lower nozzle cavity is provided with a conical surface, and the section angle of the conical surface is 60-120 degrees, specifically, 60 degrees, 75 degrees, 90 degrees, 105 degrees or 120 degrees. The ratio of the diameters of the upper section and the lower section of the conical surface is 2.5: 1-1.5: 1, in particular, in a ratio of 2.5: 1 or 2.2: 1 or 64.3: 29.8 or 2: 1 or 1.8: 1 or 1.6: 1 or 1.5: 1.

When the nozzle is in operation, molten plastic liquid is directly sprayed into the flow channel in the flow channel plate through the nozzle body, and then a product can be formed.

Claims

1. A hot runner nozzle that does not require additional heating means, comprising: the plastic injection molding machine comprises a main sprue fixing plate, a mold body, a nozzle body, a liquid flow channel and a nozzle sheath, wherein the nozzle body is connected with a liquid flow channel of the injection molding machine and is provided with a heating device, the heating device ensures that plastic liquid in the liquid flow channel is in a molten state, and the nozzle sheath is arranged outside the nozzle body; the nozzle body and the nozzle sheath are both arranged on the main sprue fixing plate.

2. The hot runner nozzle as claimed in claim 1, wherein: the nozzle sheath comprises a sheath upper cavity, a sheath lower cavity, a spraying cavity, a sealing surface, a positioning surface and a transition surface, wherein the sheath upper cavity and the sheath lower cavity are matched with the nozzle body, and the spraying cavity corresponds to the liquid flow channel.

3. The hot runner nozzle as claimed in claim 2, wherein: the ratio of the length to the diameter of the outer profile of the nozzle body is 1:1.2-1: 5; the ratio of the length to the diameter of the lower cavity of the sheath is 1:1.2-1: 5.

4. The hot runner nozzle as claimed in claim 2, wherein: the upper section of the injection cavity is provided with a spherical sealing surface, and the periphery of a liquid flow channel of the nozzle body is completely contacted with the periphery of the injection cavity of the nozzle sheath by the sealing surface, so that molten plastic in the liquid flow channel can completely enter the injection cavity.

5. The hot runner nozzle as claimed in claim 2, wherein: the upper section of the sealing surface is provided with a positioning surface which positions the nozzle body.

6. The hot runner nozzle as claimed in claim 2, wherein: and a transition surface is arranged between the positioning surface and the lower cavity of the sheath.

7. The hot runner nozzle as claimed in claim 2, wherein: the ratio of the length to the diameter of the inner hole of the liquid flow passage is 15-20.

8. The hot runner nozzle as claimed in claim 2, wherein: the end part of the lower cavity of the sheath is provided with a conical surface, the section angle of the conical surface is 60-120 degrees, and the ratio of the diameters of the upper section and the lower section of the conical surface is 2.5: 1-1.5: 1.

9. the hot runner nozzle as claimed in claim 2, wherein: the diameter of the section of the conical surface of the injection cavity, which is directly contacted with the liquid flow channel, is slightly smaller, the diameter of the section far away from the liquid flow channel is slightly larger, and the taper of the conical surface is 1.23.

10. The hot runner nozzle as claimed in claim 1, wherein: the heating device is an electric heating device, a power supply lead of the heating device is arranged on the plastic spraying machine, and a lead groove is not arranged on the main pouring gate fixing plate.