Gas-assisted forming mechanism for product injection molding

Abstract

The utility model discloses a gas-assisted forming mechanism for product injection molding, which comprises a first rack, a support frame is arranged on one side of the first rack, the other side of the first rack is fixedly connected with a first pushing cylinder and a second pushing cylinder, the second pushing cylinder is arranged on the inner side of the first pushing cylinder, and the first pushing cylinder is fixedly connected with the second pushing cylinder. A fixed mold and a movable mold are arranged on the inner side of the first rack and the inner side of the supporting frame respectively, one side of the movable mold is connected with an injection molding pipe, a gas input pipe is arranged on the injection molding pipe, one end of the gas input pipe is connected with a high-pressure plunger pump, one side of the injection molding pipe is connected with a spiral extruder, and a first pushing cylinder is arranged on one side of the fixed mold. One end of the first pushing cylinder is connected with an intercepting rod, one end of the intercepting rod penetrates through the first rack and is inserted into the fixed mold, the intercepting rod is in sliding connection with the first rack and the fixed mold, one end of the fixed mold is connected with an exhaust pipe, and one end of the exhaust pipe is located on the top side of the intercepting rod. According to the device, the injection molding uniformity can be improved, so that the product injection molding precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a gas-assisted molding mechanism for product injection molding. Background Art

[0002] Injection molding is a method of producing industrial products. Products usually use rubber injection molding and plastic injection molding. During the injection molding process, gas-assisted molding refers to the injection of inert high-pressure nitrogen when the plastic fills the cavity appropriately (75%~99.9%). The gas pushes the molten plastic to continue filling the cavity, and the gas pressure maintenance is used instead of the plastic pressure maintenance process. It is an injection molding technology.

[0003] Computer keyboards need to be injected using injection molding machines during the production process. However, the structure of computer keyboards is relatively complex, so it is very easy to have uneven injection during the injection molding process, which affects the injection molding efficiency and reduces the quality of product molding. Improvements are needed. Utility Model Content

[0004] The utility model aims to provide a gas-assisted molding mechanism for product injection molding, so as to solve the problem of uneven injection molding in the injection molding process of computer keyboards proposed in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a gas-assisted molding mechanism for product injection molding, comprising a first frame, a support frame is arranged on one side of the first frame, a fixed mold and a movable mold are arranged on the inner sides of the first frame and the support frame respectively, an injection molding tube is connected to one side of the movable mold, a gas input tube is arranged on the injection molding tube, one end of the gas input tube is connected to a high-pressure plunger pump, one side of the injection molding tube is connected to a screw extruder, a first push cylinder is arranged on one side of the fixed mold, one end of the first push cylinder is connected to an intercepting rod, one end of the fixed mold is connected to an exhaust pipe, and one end of the exhaust pipe is located on the top side of the intercepting rod.

[0006] Preferably, a first pushing cylinder and a second pushing cylinder are fixedly connected to the other side of the first frame, and the second pushing cylinder is arranged on the inner side of the first pushing cylinder.

[0007] Preferably, one end of the intercepting rod passes through the first frame and is inserted into the interior of the fixed mold, and the intercepting rod is slidably connected to the first frame and the fixed mold.

[0008] Preferably, a vacuum pump is fixedly connected to the first frame, one end of the vacuum pump is connected to an exhaust pipe, and one end of the exhaust pipe passes through the fixed mold and contacts the intercepting rod.

[0009] Preferably, one side of the second push cylinder is fixedly connected with an ejector rod, and one end of the ejector rod passes through the first frame and is inserted into the interior of the fixed mold.

[0010] Preferably, a one-way valve is provided on the injection molding tube to isolate the gas.

[0011] Preferably, a pushing hydraulic cylinder is fixedly connected to one side of the support frame, and one end of the pushing hydraulic cylinder is connected to the movable mold.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) This device can improve the uniformity of injection molding, thereby improving the precision of product injection molding.

[0014] (2) This device connects a gas input pipe to the injection tube of the movable mold, and the gas input pipe is connected to a high-pressure plunger pump. Thus, during the injection process, the injection material can be quickly and evenly entered into the movable mold and the fixed mold by injecting high-pressure gas. At the same time, a vacuum pump and an exhaust pipe are connected to one end of the fixed mold to cooperate with the high-pressure plunger pump to ensure that the material can enter the corners of the movable mold and the fixed mold, thereby improving the injection efficiency.

[0015] (3) The device sets an intercepting rod inside the fixed mold. When the intercepting rod is closed, it can ensure the flatness of the inner wall of the fixed mold. After the intercepting rod is moved, the exhaust pipe can be exposed, which is convenient for the exhaust pipe and the vacuum pump to work under negative pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a gas-assisted molding mechanism for product injection molding of the utility model;

[0017] Figure 2 It is a cross-sectional view of a gas-assisted molding mechanism for product injection molding of the utility model;

[0018] Figure 3 The utility model is a gas-assisted molding mechanism for product injection molding Figure 2 Enlarged view of point A in the middle.

[0019] In the figure: 1. first frame; 2. vacuum pump; 3. movable mold; 4. support frame; 5. push hydraulic cylinder; 6. high-pressure plunger pump; 7. screw extruder; 8. gas input pipe; 9. one-way valve; 10. injection tube; 11. first push cylinder; 12. second push cylinder; 13. fixed mold; 14. ejector rod; 15. exhaust pipe; 16. intercepting rod. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-3 The utility model provides a technical solution: a gas-assisted molding mechanism for product injection molding, comprising a first frame 1, a support frame 4 is arranged on one side of the first frame 1, a push hydraulic cylinder 5 is fixedly connected to one side of the support frame 4, and one end of the push hydraulic cylinder 5 is connected to the movable mold 3; this structure can push the movable mold 3 to move horizontally by pushing the hydraulic cylinder 5; a first push cylinder 11 and a second push cylinder 12 are fixedly connected to the other side of the first frame 1, and the second push cylinder 12 is arranged on the inner side of the first push cylinder 11; one end of the intercepting rod 16 penetrates the first frame 1 and is inserted into the fixed mold 13 Internally, the intercepting rod 16 is slidably connected to the first frame 1 and the fixed mold 13; the first frame 1 is fixedly connected with a vacuum pump 2, one end of the vacuum pump 2 is connected to the exhaust pipe 15, and one end of the exhaust pipe 15 passes through the fixed mold 13 and contacts the intercepting rod 16; this structure uses negative pressure technology through the vacuum pump 2 to cooperate with the high-pressure plunger pump 6 when the high-pressure plunger pump 6 is working, thereby improving the working efficiency of the high-pressure plunger pump 6; this structure can push the intercepting rod 16 to move through the first push cylinder 11, and when the intercepting rod 16 moves and the exhaust pipe 15 is exposed, the vacuum pump 2 can start working ; One side of the second push cylinder 12 is fixedly connected with an ejector rod 14, and one end of the ejector rod 14 passes through the first frame 1 and is inserted into the interior of the fixed mold 13; this structure pushes the ejector rod 14 through the second push cylinder 12 to eject the injection molded part, thereby improving the demoulding efficiency; the inner sides of the first frame 1 and the support frame 4 are respectively provided with a fixed mold 13 and a movable mold 3, one side of the movable mold 3 is connected with an injection tube 10, and a gas input pipe 8 is provided on the injection tube 10, and a one-way valve 9 is provided on the injection tube 10 for isolating the gas; this structure can close the one-way valve 9 when the high-pressure plunger pump 6 is turned on, This prevents gas from entering the interior of the screw extruder 7; one end of the gas input pipe 8 is connected to the high-pressure plunger pump 6, one side of the injection tube 10 is connected to the screw extruder 7, a first push cylinder 11 is provided on one side of the fixed mold 13, one end of the first push cylinder 11 is connected to an intercepting rod 16, one end of the fixed mold 13 is connected to an exhaust pipe 15, one end of the exhaust pipe 15 is located on the top side of the intercepting rod 16; the device can pressurize the gas through the high-pressure plunger pump 6 and then rush it into the gas input pipe 8, so that the pressurized material can flow evenly to the interior of the fixed mold 13 and the movable mold 3.

[0022] Working principle: When the gas-assisted molding mechanism for injection molding of the product is used, the screw extruder 7 is first operated, and the material enters the movable mold 3 and the fixed mold 13 through the injection tube 10, and the high-pressure plunger pump 6 is started at the same time of injection molding. After the high-pressure plunger pump 6 is turned on, the gas is pressurized and rushed into the gas input pipe 8. Then the high-pressure gas pushes the material inside the injection tube 10 to flow quickly into the movable mold 3 and the fixed mold 13. At the same time, the first push cylinder 11 drives the intercepting rod 16 to move, and the intercepting rod 16 is misaligned with the exhaust pipe 15. Then the vacuum pump 2 is turned on. After the vacuum pump 2 is turned on, negative pressure is generated to accelerate the flow of materials inside the movable mold 3 and the fixed mold 13, thereby improving the quality of workpiece injection molding.

[0023] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas-assisted molding mechanism for product injection molding, comprising a first frame (1), characterized in that: A support frame (4) is provided on one side of the first frame (1), and a fixed mold (13) and a movable mold (3) are provided on the inner sides of the first frame (1) and the support frame (4), respectively; an injection tube (10) is connected to one side of the movable mold (3), a gas input tube (8) is provided on the injection tube (10), one end of the gas input tube (8) is connected to a high-pressure plunger pump (6), one side of the injection tube (10) is connected to a screw extruder (7), a first push cylinder (11) is provided on one side of the fixed mold (13), one end of the first push cylinder (11) is connected to an intercepting rod (16), one end of the fixed mold (13) is connected to an exhaust pipe (15), and one end of the exhaust pipe (15) is located on the top side of the intercepting rod (16).

2. The gas-assisted molding mechanism for product injection molding according to claim 1, characterized in that: A first pushing cylinder (11) and a second pushing cylinder (12) are fixedly connected to the other side of the first frame (1), and the second pushing cylinder (12) is arranged inside the first pushing cylinder (11).

3. The gas-assisted molding mechanism for product injection molding according to claim 1, characterized in that: One end of the intercepting rod (16) passes through the first frame (1) and is inserted into the interior of the fixed mold (13), and the intercepting rod (16) is slidably connected to the first frame (1) and the fixed mold (13).

4. The gas-assisted molding mechanism for product injection molding according to claim 1, characterized in that: A vacuum pump (2) is fixedly connected to the first frame (1), one end of the vacuum pump (2) is connected to an exhaust pipe (15), and one end of the exhaust pipe (15) passes through the fixed mold (13) and contacts the intercepting rod (16).

5. The gas-assisted molding mechanism for product injection molding according to claim 2, characterized in that: One side of the second push cylinder (12) is fixedly connected to an ejector rod (14), and one end of the ejector rod (14) passes through the first frame (1) and is inserted into the interior of the fixed mold (13).

6. The gas-assisted molding mechanism for product injection molding according to claim 1, characterized in that: The injection molding tube (10) is provided with a one-way valve (9) for isolating the gas.

7. The gas-assisted molding mechanism for product injection molding according to claim 1, characterized in that: A pushing hydraulic cylinder (5) is fixedly connected to one side of the support frame (4), and one end of the pushing hydraulic cylinder (5) is connected to the movable mold (3).

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