Hot runner mold for feeding glue from pin-point gate

Abstract

The utility model provides a hot runner mold with pin-point gate glue feeding, which relates to the field of injection molds and comprises a hot runner lower mold and a hot runner upper mold, the hot runner upper mold is pressed at the upper end of the hot runner lower mold, and a first pin-point gate pressing plate and a second pin-point gate pressing plate are inserted into slotted holes in the upper surface of the hot runner upper mold. An injection nozzle head is fixedly embedded in the middle of the first pin-point gate pressing plate and the middle of the second pin-point gate pressing plate, the right side end of the first pin-point gate pressing plate is connected with a small vacuum pump through a vacuum pipe, and an air exhaust cavity channel is formed in the inner side of the first pin-point gate pressing plate; the outer ends of the first pin-point gate pressing plate and the second pin-point gate pressing plate are tightly attached to the hole wall of the upper mold of the hot runner through the annular air bag. The hot nozzle head solves the problem that in the prior art, when a pin-point gate type hot nozzle head is adopted for glue injection, injection molding raw materials at a glue injection port are easily in contact with air to generate bubbles, and the injection molding effect of a mold is affected.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a hot runner mold with a fine water inlet for glue injection. Background Art

[0002] With the development of injection molding technology, hot runner technology is more widely used in injection molds. The existing plastic mold glue feeding methods mainly include hot runner glue feeding, fine gate glue feeding and large gate glue feeding. After searching, the existing technology (application number: CN202123399850.8 ), the article records that "the injection molding machine first provides fluid material into the hot nozzle. After the material enters the heating cavity of the hot nozzle, it is heated to the injection temperature by the heating ring. Then, the fine-gate hot nozzle head injects glue into the injection space of the product along the first direction X to form an injection-molded product. When the mold is separated, the B plate leaves the A plate along the first direction X, and the rear mold core fixed on the B plate drives the injection-molded product and the hot nozzle head to separate directly. At this time, the runner plate, the A plate and the front mold core are all fixed, and the material in the hot nozzle can be directly used as the material for the next injection-molded product without waste. The hot runner mold provided by the utility model adopts a fine gate instead of a needle valve gate, which greatly saves the manufacturing cost of the mold, saves product materials, and enhances the market competitiveness of the enterprise." However, when the fine-gate hot nozzle head is used for glue injection in the prior art, the injection molding material at the injection port is easily exposed to air to generate bubbles, which affects the injection molding effect of the mold. Utility Model Content

[0003] In order to overcome the defects of the existing technology, a hot runner mold with a fine gate for glue injection is provided to solve the problem that when a fine gate hot nozzle is used in the existing technology to inject glue, the injection material at the injection port is easily exposed to air and generates bubbles, which affects the injection effect of the mold.

[0004] To achieve the above purpose, a hot runner mold with a fine gate for glue injection is provided, comprising: a hot runner lower mold and a hot runner upper mold, wherein the upper end of the hot runner lower mold is pressed with the hot runner upper mold.

[0005] The first and second fine sprue pressure plates are inserted into the slots on the upper surface of the hot runner upper mold. An injection nozzle is embedded and fixed in the middle of the first and second fine sprue pressure plates. The right end of the first fine sprue pressure plate is connected to a small vacuum pump through a vacuum tube. An exhaust cavity is provided on the inner side of the first fine sprue pressure plate. The outer ends of the first and second fine sprue pressure plates are tightly attached to the hole wall of the hot runner upper mold through an annular air bag.

[0006] Preferably, an injection cavity is provided inside the hot runner lower mold, and an electric heating device is installed inside the hot runner lower mold; and the electric heating device is distributed at the outer end of the injection cavity.

[0007] Preferably, a positioning hole is opened on the upper surface of the hot runner lower mold, and a positioning column is welded on the lower end of the hot runner upper mold; and the positioning column is plugged into the positioning hole correspondingly.

[0008] Preferably, a sealing strip is bonded to the lower surface of the hot runner upper mold, and a fine water injection port is opened diagonally on the inner side of the hot runner upper mold; and a first fine water port pressure plate and a second fine water port pressure plate are respectively inserted into the fine water injection port.

[0009] Preferably, the right sides of the first fine shroud pressure plate and the second fine shroud pressure plate are both connected with air pipes, and the air pipes are connected with the air inlet and outlet holes of the annular airbag through pipelines.

[0010] Preferably, a fine sprue-shaped outlet is provided at the lower end of the injection nozzle, an injection tube is connected to the upper end of the injection nozzle, and the vacuum tube is connected to the injection cavity through an exhaust cavity.

[0011] Preferably, the first sprue pressure plate, the second sprue pressure plate, the small vacuum pump, the vacuum tube, the annular airbag, the air extraction cavity and the injection nozzle constitute a vacuum type sprue glue feeding structure.

[0012] The beneficial effect of the present invention is that the hot runner mold with a fine sprue for glue inlet of the present invention utilizes a fine sprue pressure plate to insert the injection nozzle into the fine sprue of the hot runner mold, and a small vacuum pump is used to evacuate the injection cavity through the exhaust cavity on the inner side of the first fine sprue pressure plate, and the fine sprue of the hot runner mold in a vacuum state is injected, so that the contact between the injection molding material and the air is avoided when the hot runner mold is glued inlet, the cleanliness of the raw material at the fine sprue is ensured, the generation of bubbles at the glue inlet fine sprue of the hot runner mold is greatly reduced, and the injection molding quality of the hot runner mold is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a front view structural schematic diagram of a hot runner mold with a fine sprue for glue inlet according to an embodiment of the utility model.

[0014] Figure 2 This is a schematic diagram of the top cross-sectional structure of the hot runner lower mold according to an embodiment of the present utility model.

[0015] Figure 3 This is a schematic diagram of the front cross-sectional connection structure of the first fine shroud pressure plate and the injection nozzle according to an embodiment of the present utility model.

[0016] Figure 4 This is a schematic top view of the cross-sectional structure of the first fine shroud pressure plate of an embodiment of the present utility model.

[0017] In the figure: 1. Hot runner lower mold; 11. Injection cavity; 12. Positioning hole; 13. Electric heating device; 2. Hot runner upper mold; 21. Sealing strip; 22. Positioning column; 3. First fine sprue pressure plate; 31. Second fine sprue pressure plate; 32. Small vacuum pump; 33. Vacuum tube; 34. Air pipe; 35. Annular airbag; 36. Exhaust cavity; 4. Injection nozzle; 41. Injection tube; 42. Exit port. DETAILED DESCRIPTION

[0018] Reference Figures 1 to 4 As shown, the utility model provides a hot runner mold with a fine water inlet, comprising: a hot runner lower mold 1 and a hot runner upper mold 2, wherein the upper end of the hot runner lower mold 1 is pressed with the hot runner upper mold 2.

[0019] The first fine gate pressure plate 3 and the second fine gate pressure plate 31 are inserted into the grooves on the upper surface of the hot runner upper mold 2. The injection nozzle 4 is embedded and fixed in the middle of the first fine gate pressure plate 3 and the second fine gate pressure plate 31. The right end of the first fine gate pressure plate 3 is connected to a small vacuum pump 32 through a vacuum tube 33. An exhaust cavity 36 is provided on the inner side of the first fine gate pressure plate 3. The outer ends of the first fine gate pressure plate 3 and the second fine gate pressure plate 31 are tightly attached to the hole wall of the hot runner upper mold 2 through an annular air bag 35.

[0020] Working principle: First, seal and press the hot runner lower mold 1 and the hot runner upper mold 2, and use an air pump to inflate the annular airbag 35 so that the annular airbag 35 can tightly fit the first fine gate pressure plate 3 and the second fine gate pressure plate 31 to the hot runner upper mold 2, and then use the small vacuum pump 32 on the side end of the first fine gate pressure plate 3 to evacuate the injection cavity 11. When the injection cavity 11 is in a vacuum state, the plastic melt is injected into the injection cavity 11 through the injection nozzle 4, thereby completing the injection process of the hot runner mold.

[0021] In this embodiment, an injection cavity 11 is provided inside the hot runner lower mold 1 , and an electric heating device 13 is installed inside the hot runner lower mold 1 ; and the electric heating device 13 is distributed at the outer end of the injection cavity 11 .

[0022] As a preferred embodiment, the electric heating device 13 is convenient for heating and keeping the plastic melt injected into the injection cavity 11 warm, thereby preventing the rapid loss of temperature of the plastic melt during the injection molding process.

[0023] In this embodiment, a positioning hole 12 is opened on the upper surface of the hot runner lower mold 1 , and a positioning column 22 is welded to the lower end of the hot runner upper mold 2 ; and the positioning column 22 is plugged into the positioning hole 12 correspondingly.

[0024] As a preferred embodiment, the hot runner upper mold 2 is positioned, plugged and closed with the hot runner lower mold 1 through the positioning columns 22, thereby forming a sealed hot runner mold.

[0025] In this embodiment, a sealing strip 21 is bonded to the lower surface of the hot runner upper mold 2, and a fine water injection port is opened diagonally inside the hot runner upper mold 2; and the first fine water injection port pressure plate 3 and the second fine water injection port pressure plate 31 are respectively inserted into the fine water injection port.

[0026] As a preferred embodiment, the sealing strip 21 facilitates the hot runner lower mold 1 and the hot runner upper mold 2 to be pressed together and tightly sealed. A fine water injection port is opened diagonally to facilitate the full injection of plastic melt into the injection cavity 11.

[0027] In this embodiment, the right sides of the first shroud pressure plate 3 and the second shroud pressure plate 31 are both connected to an air pipe 34 , and the air pipe 34 is connected to the air inlet and outlet holes of the annular air bag 35 through a pipeline.

[0028] As a preferred embodiment, the air pipe 34 is connected to an air pump to facilitate inflating the annular airbag 35 so that the annular airbag 35 swells, thereby tightly fitting the fine water injection port pressure plate to the fine water injection port.

[0029] In this embodiment, a fine sprue-shaped outlet 42 is provided at the lower end of the injection nozzle 4 , an injection tube 41 is connected to the upper end of the injection nozzle 4 , and the vacuum tube 33 is connected to the injection cavity 11 through the exhaust channel 36 .

[0030] As a preferred embodiment, the outlet 42 injects the plastic melt into the injection cavity 11 of the hot runner mold. The vacuum tube 33 performs a vacuum process on the injection cavity 11 through the vacuum channel 36.

[0031] In this embodiment, the first sprue pressure plate 3, the second sprue pressure plate 31, the small vacuum pump 32, the vacuum tube 33, the annular airbag 35, the air extraction cavity 36 and the injection nozzle 4 constitute a vacuum sprue glue feeding structure.

[0032] As a preferred embodiment, the vacuum type pinhole glue inlet structure is convenient for ensuring the cleanliness of the raw materials at the pinhole glue inlet, greatly reducing the generation of bubbles at the pinhole glue inlet of the hot runner mold, and improving the injection molding quality of the hot runner mold.

[0033] The hot runner mold with a fine sprue for glue injection of the utility model can effectively solve the problem in the prior art that the injection molding raw materials at the injection port are easily exposed to air and generate bubbles when the fine sprue hot nozzle is used for glue injection, which affects the injection molding effect of the mold. The utility model facilitates avoiding the contact between the injection molding raw materials and the air when the fine sprue for glue injection of the hot runner mold, ensures the cleanliness of the raw materials at the fine sprue for glue injection, greatly reduces the generation of bubbles at the fine sprue for glue injection of the hot runner mold, improves the injection molding quality of the hot runner mold, and is suitable for hot runner molds with a fine sprue for glue injection.

Claims

1. A hot runner mold with a narrow sprue injection system, comprising: A hot runner lower mold (1) and a hot runner upper mold (2), wherein the upper end of the hot runner lower mold (1) is pressed with the hot runner upper mold (2), and the characteristics are: The first fine sprue pressure plate (3) and the second fine sprue pressure plate (31) are inserted into the slot on the upper surface of the hot runner upper mold (2); an injection nozzle (4) is embedded and fixed in the middle of the first fine sprue pressure plate (3) and the second fine sprue pressure plate (31); the right end of the first fine sprue pressure plate (3) is connected to a small vacuum pump (32) through a vacuum tube (33); an exhaust cavity (36) is provided on the inner side of the first fine sprue pressure plate (3); the outer ends of the first fine sprue pressure plate (3) and the second fine sprue pressure plate (31) are tightly attached to the hole wall of the hot runner upper mold (2) through an annular air bag (35).

2. A hot runner mold with a narrow sprue injection according to claim 1, characterized in that: An injection cavity (11) is provided inside the hot runner lower mold (1), and an electric heating device (13) is installed inside the hot runner lower mold (1); and the electric heating device (13) is distributed at the outer end of the injection cavity (11).

3. A hot runner mold with a narrow sprue injection according to claim 1, characterized in that: A positioning hole (12) is provided on the upper surface of the hot runner lower mold (1), and a positioning column (22) is welded to the lower end of the hot runner upper mold (2); and the positioning column (22) is plugged into the positioning hole (12) in a corresponding manner.

4. A hot runner mold with a narrow sprue injection according to claim 1, characterized in that: A sealing strip (21) is bonded to the lower surface of the hot runner upper mold (2), and a fine water injection port is provided diagonally on the inner side of the hot runner upper mold (2); and a first fine water port pressure plate (3) and a second fine water port pressure plate (31) are respectively inserted into the fine water injection port.

5. The hot runner mold with a narrow sprue injection according to claim 1, characterized in that: The right sides of the first fine sprue pressure plate (3) and the second fine sprue pressure plate (31) are both connected to air pipes (34), and the air pipes (34) are connected to the air inlet and outlet holes of the annular air bag (35) through pipes.

6. A hot runner mold with a narrow sprue injection according to claim 1, characterized in that: The lower end of the injection nozzle (4) is provided with a fine water outlet (42), the upper end of the injection nozzle (4) is connected to an injection tube (41), and the vacuum tube (33) is connected to the injection cavity (11) through the air extraction cavity (36).

7. The hot runner mold with a narrow sprue injection according to claim 1, characterized in that: The first fine sprue pressure plate (3), the second fine sprue pressure plate (31), the small vacuum pump (32), the vacuum tube (33), the annular airbag (35), the air extraction cavity (36) and the injection nozzle (4) constitute a vacuum fine sprue glue feeding structure.

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