Supercritical fluid foaming blow molding machine

Abstract

The utility model relates to the technical field of supercritical fluid foaming, in particular to a supercritical fluid foaming blow molding machine which comprises a rack, an extruder and a machine head which are sequentially connected are arranged on the rack, and the supercritical fluid foaming blow molding machine is characterized by further comprising supercritical fluid injection equipment, a fluid metering valve and a one-way valve. The supercritical fluid injection equipment is sequentially connected with the fluid metering valve, the one-way valve and the rear section of the screw barrel of the extruder through pipelines, and the supercritical fluid is accurately metered by arranging the flow metering valve and the one-way valve, so that the subsequent foaming uniformity is ensured; a mixer is connected between a discharge port of the extruder and an injection port of the machine head, the machine head is sleeved with the oil injection temperature regulator, the oil injection temperature regulator comprises a plurality of connected hoops, each hoop comprises a left hoop and a right hoop, the left hoops and the right hoops are connected through bolts, and the oil injection temperature regulator covers the heating area. Due to the closed circulation design, heat conduction oil is recycled, the heat loss is low, and the heat transfer efficiency is high; and the temperature can be precisely controlled, and the precise manufacturing requirement is met.

Description

Technical fields:

[0001] This application relates to the field of supercritical fluid foaming technology, and in particular to a supercritical fluid foaming blow molding machine. Background technology:

[0002] Chinese utility model patent application number 201920164308.8—a supercritical fluid extrusion blow molding foaming device—comprises a feeding system, a twin-screw extruder, an air inlet valve, a pressure pump, a connecting body I, a dynamic mixer, a connecting body II, a melt pump, a connecting body III, a single-screw extruder, a right-angle die head, and a blow molding die. The feeding system is located in the feeding section of the twin-screw extruder. The air inlet valve is connected to the pressure pump and the melting section of the twin-screw extruder via a gas delivery pipe. Connecting body I connects the twin-screw extruder and the dynamic mixer; connecting body II connects the dynamic mixer and the melt pump; connecting body III connects the melt pump and the single-screw extruder; the right-angle die head is located at the discharge end of the single-screw extruder; and the blow molding die is located below the right-angle die head. This device is suitable for thermoplastic polymers and utilizes supercritical fluids to produce extruded blow-molded foamed products. It features simple structure, reduced cost, environmental friendliness, and convenient operation.

[0003] This patent application uses a mobile ring infrared heater to control the temperature of tubular preforms. However, since infrared rays can only irradiate the surface within their visible range and are affected by scattering and reflection, a certain amount of energy loss will occur during the irradiation process, requiring higher power to compensate for the energy loss. Furthermore, the device needs to cool down at a certain stage, but the mobile ring infrared heater cools down slowly, leading to continuous foaming and quality defects, which cannot meet the actual production needs. Utility Model Content:

[0004] To solve the above-mentioned technical problems, this utility model provides a supercritical fluid foaming blow molding machine. The technical problems it solves are: existing heating devices suffer from energy loss; and when cooling is required, the speed is slow, leading to continuous foaming and quality defects, thus failing to meet actual production needs. To solve the above-mentioned technical problems, the technical solution adopted by this utility model is:

[0005] A supercritical fluid foaming blow molding machine includes a frame, on which an extruder and a die head are sequentially connected, characterized in that it further includes:

[0006] Supercritical fluid injection equipment, fluid metering valve, check valve. The supercritical fluid injection equipment is connected to the fluid metering valve, check valve and the rear section of the extruder barrel in sequence through pipelines.

[0007] The mixer is connected at both ends to the extruder outlet and the die head injection port, respectively.

[0008] The oil injection temperature regulator is sleeved on the outside of the machine head. The oil injection temperature regulator includes several connected clamps, each clamp including a left clamp and a right clamp, which are connected by bolts.

[0009] Furthermore, the supercritical fluid injection equipment is a supercritical CO2 injection equipment or a supercritical N2 injection equipment.

[0010] Furthermore, both the left and right clamps are hollow structures. The left clamp has a left inlet and a left outlet, and the right clamp has a right inlet and a right outlet. The left outlet is connected to the right inlet.

[0011] Furthermore, the right outlet of the adjacent clamp is connected to the left inlet of the adjacent clamp.

[0012] Furthermore, the oil injection temperature regulator is connected to the oil circulation heating system via pipeline.

[0013] Furthermore, the mixer is a static mixer, with a threaded oil groove on the outer peripheral wall of the static mixer, and a sleeve fitted outside the threaded oil groove, with inlet and outlet ports on the sleeve.

[0014] Furthermore, a feed cylinder with a funnel-shaped structure is fixedly connected to the outlet end of the static mixer, and the feed cylinder is connected to the head.

[0015] The beneficial effects of this utility model are: by setting a flow metering valve and a check valve, the supercritical fluid is accurately metered to ensure the uniformity of subsequent foaming; and the heating zone is covered by an oil injection temperature regulator. The closed-loop design allows the heat transfer oil to be recycled, resulting in low heat loss and high heat transfer efficiency; and the temperature can be precisely controlled to meet the needs of precision manufacturing.

[0016] By setting a threaded oil groove at the mixer, premature cooling is prevented when the molten material is uniformly mixed with the supercritical fluid, thus ensuring the quality of subsequent foaming. Attached image description:

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the oil injection temperature regulator of this utility model.

[0019] Figure 3 This is a three-dimensional structural diagram of the oil injection temperature regulator and the machine head of this utility model.

[0020] Figure 4 This is a cross-sectional structural diagram of the mixer of this utility model.

[0021] In the picture:

[0022] 1. Frame, 2. Extruder, 3. Die head, 4. Supercritical fluid injection equipment, 5. Mixer, 6. Oil injection temperature regulator, 7. Left clamp, 71. Left inlet, 72. Left outlet, 8. Right clamp, 81. Right inlet, 82. Right outlet, 9. Sleeve, 10. Sleeve, 11. Threaded oil groove. Detailed implementation method:

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the utility model will now be described in further detail with reference to the accompanying drawings and the following embodiments, so that the public can better understand the implementation method of this utility model. The specific implementation scheme of this utility model is as follows:

[0024] A supercritical fluid foaming blow molding machine includes a frame 1, on which an extruder 2 and a die head 3 are sequentially connected. The machine is characterized by further including a supercritical fluid injection device 4, a fluid metering valve, and a check valve. The supercritical fluid injection device 4 is connected to the fluid metering valve, the check valve, and the rear section of the extruder 2's barrel via pipelines. The flow metering valve and the check valve ensure precise metering of the supercritical fluid, guaranteeing uniformity in subsequent foaming. A mixer 5 connects the extruder 2's outlet and the die head 3's injection port. An oil injection temperature regulator 6 is fitted onto the outside of the die head 3. The oil injection temperature regulator 6 includes several connected clamps, each clamp comprising a left clamp 7 and a right clamp 8, which are connected by bolts. The oil injection temperature regulator covers the heating zone, and the closed-loop design allows for the recycling of the heat transfer oil, resulting in low heat loss and high heat transfer efficiency. Furthermore, it enables precise temperature control, meeting the needs of precision manufacturing.

[0025] Specifically, the supercritical fluid injection device 4 is a supercritical CO2 injection device or a supercritical N2 injection device.

[0026] It should be noted that both the left clamp 7 and the right clamp 8 are hollow structures. The left clamp 7 has a left liquid inlet 71 and a left liquid outlet 72, and the right clamp 8 has a right liquid inlet 81 and a right liquid outlet 82. The left liquid outlet 72 is connected to the right liquid inlet 81. The split structure design facilitates installation. The right liquid outlet 82 of the adjacent clamp is connected to the left liquid inlet 71 of the adjacent clamp. The alternating connection structure reduces the impact of temperature loss on temperature control.

[0027] It should be noted that the oil injection temperature regulator 6 is connected to the oil circulation heating system via a pipeline.

[0028] Furthermore, the mixer 5 is a static mixer. The outer peripheral wall of the static mixer is provided with a threaded oil groove 11. A sleeve 9 is fitted outside the threaded oil groove 11. The sleeve 9 is provided with inlet and outlet ports. When the molten material and the supercritical fluid are mixed evenly, it is prevented from cooling down prematurely, thus ensuring the quality of subsequent foaming.

[0029] A feed cylinder 10 with a funnel structure is fixedly connected to the outlet end of the static mixer. The feed cylinder 10 is connected to the die head 3 to further compress and mix the supercritical molten material after mixing.

[0030] The working principle and process of this utility model are as follows:

[0031] The material is added to the extruder 2, and the screw heating energy allows the material to be fully plasticized and uniformly mixed. Then, the supercritical fluid injection equipment is started. The supercritical fluid enters the rear section of the extruder 2 screw barrel through the pipeline, passing through the fluid metering valve and the check valve in sequence, and mixes with the molten material. The extruder 2 extrudes the mixed molten material to the static mixer 5 for further mixing, and then enters the die head 3. The oil circulation heating system drives the oil to enter the oil injection temperature regulator 6 for temperature regulation.

[0032] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "left," "right," "front," "rear," "lower left," "upper right," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Although this utility model has been described according to a limited number of embodiments, those skilled in the art should understand from the above description that other embodiments can be conceived within the scope of this utility model described herein.

Claims

1. A supercritical fluid foaming blow molding machine, comprising a frame (1), on which an extruder (2) and a die head (3) are sequentially connected, characterized in that, It also includes: Supercritical fluid injection equipment (4), fluid metering valve, check valve, supercritical fluid injection equipment (4) is connected to the fluid metering valve, check valve and the rear section of the extruder (2) screw barrel in sequence through pipelines; The mixer (5) is connected at both ends to the discharge port of the extruder (2) and the injection port of the die head (3), respectively. The oil injection temperature regulator (6) is fitted on the outside of the machine head (3). The oil injection temperature regulator (6) includes several connected clamps. Each clamp includes a left clamp (7) and a right clamp (8). The left clamp (7) and the right clamp (8) are connected by bolts.

2. The supercritical fluid foaming blow molding machine according to claim 1, characterized in that: The supercritical fluid injection device (4) is a supercritical CO2 injection device or a supercritical N2 injection device.

3. The supercritical fluid foaming blow molding machine according to claim 1, characterized in that: Both the left clamp (7) and the right clamp (8) are hollow structures. The left clamp (7) has a left inlet (71) and a left outlet (72), and the right clamp (8) has a right inlet (81) and a right outlet (82). The left outlet (72) is connected to the right inlet (81).

4. The supercritical fluid foaming blow molding machine according to claim 3, characterized in that: The right outlet (82) of the adjacent clamp is connected to the left inlet (71) of the adjacent clamp.

5. The supercritical fluid foaming blow molding machine according to claim 4, characterized in that: The oil temperature regulator (6) is connected to the oil circulation heating system via a pipeline.

6. The supercritical fluid foaming blow molding machine according to claim 1, characterized in that: The mixer (5) is a static mixer. The outer peripheral wall of the static mixer is provided with a threaded oil groove (11). A sleeve (9) is fitted outside the threaded oil groove (11). The sleeve (9) is provided with an inlet and outlet.

7. The supercritical fluid foaming blow molding machine according to claim 6, characterized in that: The outlet end of the static mixer is fixedly connected to a feed cylinder (10) with a funnel structure, and the feed cylinder (10) is connected to the head (3).

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