A gas circulating device for injection molding of high thermal conductive plastic material

Abstract

The utility model relates to a kind of gas circulation devices for high thermal conductivity plastic material injection molding, the utility model effectively solves the problem that conventional exhaust system is prone to harmful gas dissipation, it is inconvenient to filter and recycle harmful gas, causing resource waste.The gas circulation device for high thermal conductivity plastic material injection molding is treated by cooling filtering mechanism to high-temperature harmful gas for three levels, simultaneously realizes gas cooling, particulate matter interception and harmful substance adsorption, can significantly reduce emission pollution, two first suction mechanism can expand the range of negative pressure, ensure that high-temperature harmful gas is collected efficiently, avoid dissipation to external air;At the same time, clean cold air filtered by cooling is accurately blown back to injection molding part by blowing mechanism, can accelerate plastic forming, reduce additional cooling energy consumption, avoid energy waste, and can blow the gas flow around thermoplastic part, so that the collection efficiency of the device for high-temperature harmful gas is higher, more convenient for use when high thermal conductivity plastic material injection molding.

Description

Technical Field

[0001] This utility model belongs to the technical field of gas treatment equipment for injection molding, and specifically relates to a gas circulation device for injection molding of high thermal conductivity plastic materials. Background Technology

[0002] High thermal conductivity plastics are composite materials prepared by adding high thermal conductivity fillers (such as boron nitride, carbon fiber, metal oxides, etc.) to a matrix plastic. Their injection molding process requires injecting molten material into a mold at high temperatures to achieve the directional arrangement of the fillers and the formation of thermal conductivity pathways. In existing injection molding processes for high thermal conductivity plastics, the material in its high-temperature molten state releases harmful gases containing volatile organic compounds, particulate matter, and odors.

[0003] Traditional treatment methods typically involve direct emission or simple filtration using external ventilation systems. Harmful gases are released directly into the air without adequate treatment, causing air pollution in the workshop and the surrounding environment. Conventional ventilation systems have limited suction range, making it difficult to fully cover the injection molding area, resulting in the escape of harmful gases. At the same time, existing equipment lacks a mechanism for recycling the filtered clean cold air, failing to form a closed-loop system, leading to energy waste and making it inconvenient to use when injection molding high thermal conductivity plastic materials. Utility Model Content

[0004] To address the above issues and overcome the shortcomings of existing technologies, this utility model provides a gas circulation device for injection molding of high thermal conductivity plastic materials. This device performs three-stage treatment of high-temperature harmful gases through a cooling and filtration mechanism, simultaneously achieving gas cooling, particulate matter interception, and harmful substance adsorption. This significantly reduces emission pollution. The two first-stage suction mechanisms expand the negative pressure range, preventing the gases from escaping into the outside air. At the same time, the clean, cooled air is precisely returned to the injection site by a blower mechanism, accelerating plastic molding, reducing additional cooling energy consumption, and avoiding energy waste.

[0005] A gas circulation device for injection molding of high thermal conductivity plastic materials, comprising:

[0006] Filter box;

[0007] A centrifugal fan is located below the filter box;

[0008] A cooling and filtration mechanism is installed inside the filter box to cool and filter the gas.

[0009] A telescopic splitter pipe connects to the air inlet at the top of the filter box;

[0010] The first suction mechanism, of which there are two, is connected to the inside of the filter box through a telescopic diverter pipe. It is used to be fitted outside the injection part and to collect the high-temperature gas generated during injection.

[0011] The exhaust mesh plate is fixedly connected to the bottom of the filter box and is used to generate uniform suction inside the filter box.

[0012] The second suction mechanism is located at the bottom of the exhaust mesh plate, and its bottom end is connected to the air inlet of the centrifugal fan for extracting air from the filter box.

[0013] A blower mechanism, connected to the outlet of the centrifugal fan, is used to blow the cooled and filtered gas toward the injection molding part;

[0014] When the centrifugal fan is running, negative pressure is generated in the filter box through the second suction mechanism and the exhaust screen, so that the high-temperature gas drawn in by the first suction mechanism flows through the cooling and filtration mechanism for cooling and filtration, and is then pressurized by the centrifugal fan and blown out by the blower mechanism, forming a gas circulation.

[0015] Preferably, the cooling and filtration mechanism includes a heat exchanger, a filter screen, and an activated carbon filter layer arranged vertically from top to bottom inside the filter box. The heat exchanger, filter screen, and activated carbon filter layer are all horizontally arranged on the side of the filter box, and the gas passes through the heat exchanger, filter screen, and activated carbon filter layer from top to bottom.

[0016] Preferably, the first suction mechanism includes a first tapered tube, a first multi-directional tube head, a first suction tube, and a suction hood. The two ends of the first tapered tube are respectively connected to the telescopic diverter tube and the first multi-directional tube head. The first suction tube is fixedly connected to the four sides and the bottom of the first multi-directional tube head. The ends of the plurality of first suction tubes away from the first multi-directional tube head are fixedly connected to the suction hood. The suction hood, the first suction tube, the first multi-directional tube head, the first tapered tube, and the telescopic diverter tube are interconnected.

[0017] Preferably, the second suction mechanism includes a second suction pipe, a second multi-directional pipe head, a second tapered pipe, and a connecting pipe. The second multi-directional pipe head is fixedly connected to the second suction pipe around its perimeter and top, and multiple second suction pipes are fixedly connected to the lower surface of the exhaust mesh plate. The bottom end of the second multi-directional pipe head is connected to the connecting pipe through the second tapered pipe, and the end of the connecting pipe away from the second tapered pipe is connected to the air inlet of the centrifugal fan.

[0018] Preferably, the blower mechanism includes an air tank, a split blower pipe, and blower heads. The air tank is connected to the air outlet of the centrifugal fan. There are two split blower pipes, and the air inlet ends of the two split blower pipes are both inserted into the air tank. The split ends of the two split blower pipes extend into two suction hoods in the two first suction mechanisms, respectively. Multiple blower heads are fixedly connected at equal intervals on the side of the split ends of the two split blower pipes that are close to each other.

[0019] Preferably, the blower heads at the split ends of the two split blowers face the injection molding area, and the split ends of the two split blowers do not correspond to the air intakes inside the two air intake hoods, which can ensure the normal air intake of the air intake hoods.

[0020] The beneficial effects of the above technical solution are as follows:

[0021] This gas circulation device for injection molding of high thermal conductivity plastic materials uses a cooling and filtration mechanism to perform three-stage treatment of high-temperature harmful gases, simultaneously achieving gas cooling, particulate matter interception, and harmful substance adsorption. This significantly reduces emission pollution. The two primary suction mechanisms expand the negative pressure range, ensuring that high-temperature harmful gases are efficiently collected and preventing them from escaping into the outside air. At the same time, the clean, cooled air is precisely blown back to the injection site by the blower mechanism, which accelerates plastic molding, reduces additional cooling energy consumption, avoids energy waste, and blows airflow around the thermoplastic part, making the device more efficient at collecting high-temperature harmful gases and easier to use when injection molding high thermal conductivity plastic materials. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the first suction mechanism of this utility model in its disassembled state;

[0024] Figure 3 This is a schematic diagram showing the disassembled state of the first multi-directional tube head and the first suction tube of this utility model;

[0025] Figure 4 This is a schematic diagram showing the disassembled state of the cold-cutting filter mechanism and the second air intake mechanism of this utility model;

[0026] Figure 5 This is a schematic diagram of the blower mechanism of this utility model.

[0027] In the diagram: 1. Filter box; 2. Centrifugal fan; 3. Cooling and filtration mechanism; 301. Heat exchanger; 302. Filter screen; 303. Activated carbon filter layer; 4. Telescopic diverter pipe; 5. First suction mechanism; 501. First tapered pipe; 502. First multi-directional pipe head; 503. First suction pipe; 504. Suction hood; 6. Exhaust mesh plate; 7. Second suction mechanism; 701. Second suction pipe; 702. Second multi-directional pipe head; 703. Second tapered pipe; 704. Connecting pipe; 8. Blower mechanism; 801. Air tank; 802. Diverter blower pipe; 803. Blower pipe head. Detailed Implementation

[0028] The foregoing and other technical contents, features and effects of this utility model are described in conjunction with the appendix below. Figures 1 to 5 The embodiments are described in detail below.

[0029] This embodiment provides a gas circulation device for injection molding of high thermal conductivity plastic materials, as shown in the attached figure. Figure 1-5 As shown, the system includes a filter box 1 and a centrifugal fan 2. The filter box 1 can be fixedly installed on the frame of an external injection molding machine. The filter box 1 contains a cooling and filtration mechanism 3 that cools and filters the gas. The cooling and filtration mechanism 3 includes a heat exchanger 301, a filter screen 302, and an activated carbon filter layer 303. The heat exchanger 301 is a known technology, and its interior is equipped with cooling pipes that can connect to external liquid-cooled or air-cooled pipes, enabling heat dissipation from the entire heat exchanger 301. The heat exchanger 301 is horizontally installed at the top of the side of the filter box 1, allowing gas to pass through it from top to bottom, thus enabling the heat exchanger 301 to cool the gas. The filter screen 302 and the activated carbon filter layer 303 are horizontally installed in the middle and bottom of the side of the filter box 1, respectively. The filter screen 302 is positioned above the activated carbon filter layer 303 and is vertically aligned with the heat exchanger 301. The filter screen 302 can effectively intercept plastic dust, burrs, and other particulate matter, while the activated carbon filter layer 303 can effectively filter out harmful substances in the gas, transforming the high-temperature harmful gas passing through the cooling filter mechanism 3 into low-temperature clean gas. The filter screen 302 and the activated carbon filter layer 303 can be removed outwards, facilitating the cleaning of the filter screen 302 and the replacement of the activated carbon filter layer 303, thus maintaining a good filtration effect.

[0030] A telescopic diverter pipe 4 is fixedly connected to the air inlet end of the filter box 1, and both air inlets of the telescopic diverter pipe 4 are equipped with a first suction mechanism 5 for sucking up the gas generated during injection molding. The first suction mechanism 5 includes a first tapered pipe 501, a first multi-directional pipe head 502, a first suction pipe 503, and a suction hood 504. The two ends of the first tapered pipe 501 are respectively connected to the telescopic diverter pipe 4 and the first multi-directional pipe head 502. The first suction pipe 503 is fixedly connected to the four sides and the bottom of the first multi-directional pipe head 502. The suction hood 504 is fixedly connected to the multiple first suction pipes 501. At the end furthest from the telescopic diverter pipe 4, the suction hood 504, the first suction pipe 503, the first multi-directional pipe head 502, and the first tapering pipe 501 are all interconnected and connected to the telescopic diverter pipe 4; multiple first suction pipes 503 can increase the suction range of the suction hood 504, making the suction force inside the suction hood 504 more uniform; the two suction hoods 504 in the two first suction mechanisms 5 can be fitted outside the injection molding part, so as to fully collect the high-temperature gas generated during injection molding and avoid the high-temperature gas containing harmful substances from spreading into the air and causing air pollution.

[0031] A suction screen 6 is fixedly connected to the bottom of the filter box 1, and a second suction mechanism 7 for drawing air from the filter box 1 is provided on the lower surface of the suction screen 6. The bottom of the second suction mechanism 7 is connected to the air inlet of the centrifugal fan 2. The second suction mechanism 7 includes a second suction pipe 701, a second multi-directional pipe head 702, a second tapered pipe 703, and a connecting pipe 704. The top edges of all four sides of the second multi-directional pipe head 702 are fixedly connected to the second suction pipes 701, and multiple second suction pipes 701 are fixedly connected to the lower surface of the suction screen 6. The second tapered pipe 703 is fixedly connected between the second multi-directional pipe head 702 and the connecting pipe 704, and the connecting pipe 704 is away from the second tapered pipe 703. One end is connected to the air inlet of the centrifugal fan 2. When the centrifugal fan 2 is running, it can generate suction in the connecting pipe 704, thereby generating suction in the exhaust screen 6 through the second suction pipe 701. The exhaust screen 6 is provided with multiple ventilation slots, which can exhaust air from the filter box 1. The high-temperature harmful gas generated during injection molding is drawn in through the first suction mechanism 5, and the high-temperature harmful gas passes through the cooling filter mechanism 3 in the filter box 1, thereby cooling and filtering the high-temperature harmful gas generated during injection molding. This effectively reduces the gas temperature and filters out harmful substances in the gas, making it easier to recycle the gas later and preventing harmful substances from spreading into the outside air and affecting the air environment.

[0032] The centrifugal fan 2 is equipped with a blower mechanism 8 at its outlet end, which can cool the injection molding part by blowing air. The blower mechanism 8 includes an air tank 801, a split air pipe 802, and a blower head 803. The air tank 801 is connected to the outlet end of the centrifugal fan 2. There are two split air pipes 802, and the air inlets of the two split air pipes 802 are both inserted into the air tank 801. The split ends of the two split air pipes 802 are respectively inserted into the two suction hoods 504 in the two first suction mechanisms 5 and are horizontally fixed to the inner wall of the suction hoods 504. The split ends of the two split air pipes 802 are close to each other on the side. Multiple air blower heads 803 are fixedly connected at equal intervals; the air blower heads 803 at the branch ends of the two branch air blowers 802 are all facing the injection part, and the branch ends of the two branch air blowers 802 do not correspond to the air intakes inside the two air intake hoods 504, which can ensure the normal air intake of the air intake hoods 504; the centrifugal fan 2 blows the cooled and filtered cold air into the air storage tank 801, and sprays it outward from the multiple air blower heads 803 at the branch ends of the two branch air blowers 802, which can cool the injection part by blowing air, which facilitates the rapid injection molding of plastic materials, thereby forming a gas circulation flow and avoiding harmful gases from polluting the outside air.

[0033] In summary, the gas circulation device for injection molding of high thermal conductivity plastic materials has the following operating steps:

[0034] 1. Adjust the length and angle of the telescopic diverter 4 to ensure that the suction hood 504 is precisely aligned with the injection molding station. Place the two suction hoods 504 symmetrically on the outside of the mold closing part of the injection mold to ensure complete coverage of the gas escape area.

[0035] 2. When the centrifugal fan 2 is turned on, negative pressure is generated at the exhaust screen plate 6 through the second suction mechanism 7. The high-temperature harmful gas is captured by the suction hood 504 → collected through the multi-way first suction pipe 503 → flows into the telescopic diversion pipe 4 through the first multi-directional pipe head 502 and the first tapered pipe 501; the gas enters from the top of the filter box 1 and passes through the heat exchanger 301, filter screen 302 and activated carbon filter layer 303 from top to bottom.

[0036] 3. The purified cold air enters the second suction mechanism 7 through the exhaust mesh plate 6, then is collected through the second suction pipe 701 to the second multi-directional pipe head 702, and then enters the centrifugal fan 2 through the second tapered pipe 703. The centrifugal fan 2 delivers the gas to the gas storage tank 801, and the gas is split into two split air blowing pipes 802 and sprayed into the injection part with a uniform airflow from the air blowing pipe head 803 to cool the injection part.

[0037] The above description is only for illustrating the present utility model. It should be understood that the present utility model is not limited to the above embodiments, and various modifications that conform to the concept of the present utility model are within the protection scope of the present utility model.

Claims

1. A gas circulation device for injection molding of high thermal conductivity plastic materials, characterized in that, include: Filter box (1); Centrifugal fan (2) is located below the filter box (1); A cooling and filtration mechanism (3) is installed inside the filter box (1) to cool and filter the gas; Telescopic splitter pipe (4) is connected to the air inlet at the top of the filter box (1); The first suction mechanism (5) consists of two parts, which are connected to the inside of the filter box (1) through the telescopic diversion pipe (4). They are used to be installed outside the injection part and to collect the high-temperature exhaust gas generated during injection. The exhaust mesh plate (6) is fixedly connected to the bottom of the filter box (1) to generate uniform suction force inside the filter box (1); The second suction mechanism (7) is located at the bottom of the exhaust mesh plate (6), and its bottom end is connected to the air inlet of the centrifugal fan (2) for extracting air from the filter box (1). The blower mechanism (8) is connected to the air outlet of the centrifugal fan (2) and is used to blow the cooled and filtered gas toward the injection molding part; After the centrifugal fan (2) is running, it generates negative pressure in the filter box (1) through the second suction mechanism (7) and the exhaust screen (6), so that the high temperature gas sucked in by the first suction mechanism (5) flows through the cooling filter mechanism (3) for cooling and filtration, and is then pressurized by the centrifugal fan (2) and blown out by the blower mechanism (8) to form a gas circulation.

2. The gas circulation device for injection molding of high thermal conductivity plastic materials according to claim 1, characterized in that: The cooling and filtration mechanism (3) includes a heat exchanger (301), a filter screen (302) and an activated carbon filter layer (303) arranged vertically from top to bottom inside the filter box (1). The heat exchanger (301), the filter screen (302) and the activated carbon filter layer (303) are all horizontally arranged on the side of the filter box (1), so that the gas passes through the heat exchanger (301), the filter screen (302) and the activated carbon filter layer (303) from top to bottom.

3. The gas circulation device for injection molding of high thermal conductivity plastic materials according to claim 1, characterized in that: The first suction mechanism (5) includes a first tapered tube (501), a first multi-directional tube head (502), a first suction tube (503), and a suction hood (504). The two ends of the first tapered tube (501) are respectively connected to the telescopic diverter tube (4) and the first multi-directional tube head (502). The first multi-directional tube head (502) is fixedly connected to the first suction tube (503) around its perimeter and bottom. The ends of the multiple first suction tubes (503) away from the first multi-directional tube head (502) are all fixedly connected to the suction hood (504). The suction hood (504), the first suction tube (503), the first multi-directional tube head (502), the first tapered tube (501), and the telescopic diverter tube (4) are interconnected.

4. The gas circulation device for injection molding of high thermal conductivity plastic materials according to claim 1, characterized in that: The second suction mechanism (7) includes a second suction pipe (701), a second multi-directional pipe head (702), a second tapered pipe (703), and a connecting pipe (704). The second multi-directional pipe head (702) is fixedly connected to the second suction pipe (701) around its perimeter and top, and multiple second suction pipes (701) are fixedly connected to the lower surface of the exhaust mesh plate (6). The bottom end of the second multi-directional pipe head (702) is connected to the connecting pipe (704) through the second tapered pipe (703). The end of the connecting pipe (704) away from the second tapered pipe (703) is connected to the air inlet of the centrifugal fan (2).

5. A gas circulation device for injection molding of high thermal conductivity plastic materials according to claim 1, characterized in that: The blower mechanism (8) includes an air tank (801), a split blower pipe (802), and blower heads (803). The air tank (801) is connected to the air outlet of the centrifugal fan (2). There are two split blower pipes (802), and the air inlet ends of the two split blower pipes (802) are both inserted into the air tank (801). The split ends of the two split blower pipes (802) extend into the two suction hoods (504) in the two first suction mechanisms (5). On the side of the split ends of the two split blower pipes (802) that are close to each other, multiple blower heads (803) are fixedly connected at equal intervals.

6. A gas circulation device for injection molding of high thermal conductivity plastic materials according to claim 5, characterized in that: The blower heads (803) at the branch ends of the two branch blowers (802) are both facing the injection part, and the branch ends of the two branch blowers (802) do not correspond to the air intakes inside the two air intake hoods (504), which can ensure the normal air intake of the air intake hoods (504).

Images