Blowing air leakage prevention structure of air-assisted plastic mold

Abstract

The invention discloses a gas-assisted plastic mold blowing anti-leakage structure which comprises a high-pressure nitrogen tank, a supporting pipe, a valve, a nitrogen preheating structure, an inductance heater, a connector, a silica gel gas pipe and a gas channel connector. The supporting pipe is installed on the front portion of the side end of the high-pressure nitrogen tank in the radial direction, and the valve is installed in the middle of the supporting pipe; the nitrogen preheating structure is installed at the front end of the supporting pipe, the inductive heater is installed on the nitrogen preheating structure, the connector is installed at the rear end of the silica gel gas pipe, the silica gel gas pipe is connected to the nitrogen preheating structure through the connector, and the gas channel connector is installed at the front end of the silica gel gas pipe. The problems that when the temperature difference between the temperature of injected gas and a mold and an injection molding material is large, the local cooling effect is possibly caused when the injected gas makes contact with the high-temperature mold, so that the mold material shrinks or a stress concentration area is generated, and the area possibly becomes a potential gas leakage point are solved.

Description

Technical Field

[0001] The invention relates to the field of gas-assisted injection molding, and in particular to a gas-assisted plastic mold blowing and leak-proof structure. Background Art

[0002] Gas-assisted injection molding is an advanced plastic molding technology that injects high-pressure nitrogen into the plastic melt to form a hollow plastic product or reduce the pressure inside the plastic part. This method can produce lighter and stronger products, shorten cooling time, reduce material costs and injection pressure.

[0003] When there is a large temperature difference between the injected gas and the mold and the injection material, it may cause a local cooling effect when it comes into contact with the high-temperature mold, causing the mold material to shrink or produce stress concentration areas, which may become potential leakage points. Summary of the invention

[0004] The object of the present invention is to provide a gas-assisted plastic mold blowing and leak-proof structure to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a gas-assisted plastic mold blowing and leak-proof structure, comprising a high-pressure nitrogen tank, a support tube, a valve, a nitrogen preheating structure, an inductive heater, an interface, a silicone air pipe, and an airway interface. The support tube is radially installed at the front of the side end of the high-pressure nitrogen tank, the valve is installed in the middle of the support tube, the nitrogen preheating structure is installed at the front end of the support tube, the inductive heater is installed on the nitrogen preheating structure, the interface is installed at the rear end of the silicone air pipe, and the silicone air pipe is connected to the nitrogen preheating structure through the interface, and the airway interface is installed at the front end of the silicone air pipe.

[0006] On the basis of the above technical scheme, the nitrogen preheating structure includes a silicone tube, a reducer, a mounting plate, air holes, a thermally conductive copper column, and thermally conductive fins. The reducers are respectively installed at the front and rear ends of the silicone tube, and the silicone tube is respectively installed on the support tube and the interface through the reducer. The mounting plates are respectively installed at the front and rear ends of the silicone tube, the air holes are distributed on the mounting plates, the thermally conductive copper column is axially fixed to the middle part of the silicone tube through the mounting plate, the thermally conductive fins are distributed on the side ends of the thermally conductive copper column, and the high-pressure nitrogen passes through the silicone tube through the thermally conductive fins.

[0007] Based on the above technical solution, the inductive heater heats the copper column through the silicone tube.

[0008] Compared with the prior art, the present invention has the following advantages: the present invention installs a nitrogen preheating structure in the blowing path of the high-pressure nitrogen tank, and uses an inductive heater to heat the copper column through a silicone tube to preheat the high-pressure nitrogen passing through, thereby reducing the temperature difference between the mold and the injection molding material and reducing air leakage caused by local cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the appearance structure of the present invention.

[0010] Figure 2 This is a schematic diagram of the nitrogen preheating structure of the present invention.

[0011] Figure 3 This is a cross-sectional view of the internal structure of the nitrogen preheating structure of the present invention.

[0012] In the figure: 1. high-pressure nitrogen tank, 2. support pipe, 3. valve, 4. nitrogen preheating structure, 5. inductive heater, 6. interface, 7. silicone air pipe, 8. airway interface, 9. silicone tube, 10. reducer, 11. mounting plate, 12. air hole, 13. thermal conductive copper column, 14. thermal conductive fins. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] like Figures 1 to 3 As shown, a gas-assisted plastic mold blowing and leak-proof structure comprises a high-pressure nitrogen tank 1, a support tube 2, a valve 3, a nitrogen preheating structure 4, an inductive heater 5, an interface 6, a silicone air pipe 7, and an airway interface 8. The support tube 2 is radially installed at the front end of the side end of the high-pressure nitrogen tank 1, the valve 3 is installed in the middle of the support tube 2, the nitrogen preheating structure 4 is installed at the front end of the support tube 2, the inductive heater 5 is installed on the nitrogen preheating structure 4, the interface 6 is installed at the rear end of the silicone air pipe 7, and the silicone air pipe 7 is connected to the nitrogen preheating structure 4 through the interface 6, and the airway interface 8 is installed at the front end of the silicone air pipe 7.

[0015] The nitrogen preheating structure 4 includes a silicone tube 9, a reducer 10, a mounting plate 11, air holes 12, a heat-conducting copper column 13, and heat-conducting fins 14. The reducer 10 is installed at the front and rear ends of the silicone tube 9, and the silicone tube 9 is respectively installed on the support tube 2 and the interface 6 through the reducer 10. The mounting plate 11 is respectively installed at the front and rear ends of the silicone tube 9. The air holes 12 are distributed on the mounting plate 11. The heat-conducting copper column 13 is axially fixed to the middle part of the silicone tube 9 through the mounting plate 11. The heat-conducting fins 14 are distributed on the side ends of the heat-conducting copper column 13, and the high-pressure nitrogen passes through the silicone tube 9 through the heat-conducting fins 14.

[0016] The inductive heater 5 heats the copper column 13 via the silicone tube 9 .

[0017] The working principle of the present invention is as follows: the inductive heater 5 heats the copper column 13 through the silicone tube 9, the valve 3 is opened, and the high-pressure nitrogen enters the support tube 2 from the high-pressure nitrogen tank 1 through the reducer 10, and then enters the silicone tube 9 after being dispersed by the air holes 12 on the front mounting plate 11. The high-pressure nitrogen passing through the heat-conducting fins 14 is preheated by the heat-conducting copper column 13. The preheated high-pressure nitrogen passes through the air holes 12 of the rear mounting plate 11 and is fully mixed and enters the silicone air pipe 7, and gas-assisted injection molding is performed through the airway interface 8. Reduce the temperature difference between the mold and the injection molding material. Reduce air leakage caused by local cooling.

[0018] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A blowing air leakage prevention structure for a gas-assisted plastic mold, comprising a high-pressure nitrogen gas tank (1), a support pipe (2), a valve (3), a nitrogen gas preheating structure (4), an inductive heater (5), an interface (6), a silica gel air pipe (7), and an air passage interface (8), characterized in that: The support tube (2) is radially mounted at the front end of the side end of the high-pressure nitrogen tank (1), the valve (3) is mounted at the middle of the support tube (2), the nitrogen preheating structure (4) is mounted at the front end of the support tube (2), the inductive heater (5) is mounted on the nitrogen preheating structure (4), the interface (6) is mounted at the rear end of the silicone gas pipe (7), and the silicone gas pipe (7) is connected to the nitrogen preheating structure (4) via the interface (6), and the airway interface (8) is mounted at the front end of the silicone gas pipe (7).

2. The air blowing air leakage prevention structure of an air-assisted plastic mold according to claim 1, characterized in that: The nitrogen preheating structure (4) comprises a silicone tube (9), a reducer (10), a mounting plate (11), air holes (12), a heat-conducting copper column (13), and heat-conducting fins (14). The reducer (10) is installed at the front and rear ends of the silicone tube (9), and the silicone tube (9) is installed on the support tube (2) and the interface (6) through the reducer (10). The mounting plate (11) is installed at the front and rear ends of the silicone tube (9), respectively. The air holes (12) are distributed on the mounting plate (11). The heat-conducting copper column (13) is axially fixed to the middle part of the silicone tube (9) through the mounting plate (11). The heat-conducting fins (14) are distributed on the side ends of the heat-conducting copper column (13), and the high-pressure nitrogen passes through the silicone tube (9) through the heat-conducting fins (14).

3. The air blowing air leakage prevention structure of an air-assisted plastic mold according to claim 2, characterized in that: The inductive heater (5) heats the copper column (13) via the silicone tube (9).

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