Single-layer foaming machine head of supercritical fluid foaming blow molding machine

Abstract

The utility model relates to the technical field of supercritical fluid foaming, in particular to a single-layer foaming machine head of a supercritical fluid foaming blow molding machine, which comprises a mounting plate, an outer mold body is arranged at the lower part of the mounting plate in a fixed structure manner, a lower mold mouth part is arranged at the lower part of the outer mold body, and an inner mold body is arranged in the lower mold mouth part; the inner mold body is connected with a core lifting rod to drive the inner mold body to move in the vertical direction, the core lifting rod is connected with a first power piece, an inner core rod, a middle core rod and an outer core rod are sequentially arranged between the core lifting rod and the outer mold body in a sleeving mode from inside to outside, the upper ends of the inner core rod and the middle core rod are fixedly connected with a mounting plate respectively, and the outer core rod is connected with a second power piece so that the outer core rod can slide in the vertical direction; two V-shaped material guide grooves are symmetrically formed in the peripheral surface of the inner core rod, and the two ends of the two V-shaped material guide grooves are communicated with each other, so that rotary shear flow of a spiral runner is converted into axial laminar flow, cell breakage is reduced, and the product quality is improved; an arc-shaped material guide groove is formed in the peripheral surface of the inner core rod at the upper part of the V-shaped material guide groove; and the arc-shaped material guide groove is communicated with the end part of the V-shaped material guide groove.

Description

Technical fields:

[0001] This application relates to the field of supercritical fluid foaming technology, and in particular to a single-layer foaming die head for 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] However, the right-angle die head used in this supercritical fluid blow molding machine is still the spiral flow channel die head of a regular blow molding machine, such as the die head with a variable storage bin structure in our company's application number CN202123150577.5. When producing molten material incorporating supercritical fluid, this die head is prone to causing cell rupture during the foaming process inside the die head, affecting product quality. Utility Model Content:

[0004] To solve the above-mentioned technical problems, this utility model provides a single-layer foaming die head for a supercritical fluid foaming blow molding machine. The technical problem it solves is that existing die heads are prone to causing cell rupture during actual production, affecting product quality. The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0005] The single-layer foaming head of the supercritical fluid foaming blow molding machine includes:

[0006] Mounting plate, with an outer mold body fixed at the bottom and a lower mold nozzle at the bottom;

[0007] The inner mold body is located inside the lower mold nozzle.

[0008] The core lifting rod is connected to the inner mold body to drive the inner mold body to move vertically;

[0009] The first power component is connected to the core lifting rod to drive its movement;

[0010] The inner core rod, the middle core rod, and the outer core rod are sequentially sleeved between the core lifting rod and the outer mold body. The upper ends of the inner core rod and the middle core rod are fixedly connected to the mounting plate, and the outer core rod is vertically slidably disposed between the middle core rod and the outer mold body.

[0011] The second power component is connected to the outer mandrel to drive its movement;

[0012] V-shaped guide grooves, two V-shaped guide grooves are symmetrically opened on the outer circumference of the inner core rod, and the two ends of the two V-shaped guide grooves are connected.

[0013] An arc-shaped guide groove is formed on the outer circumference of the inner core rod above the V-shaped guide groove, and the arc-shaped guide groove is connected to the end of the V-shaped guide groove.

[0014] It is also equipped with a feed inlet that connects to the arc-shaped guide trough.

[0015] Furthermore, the depth of the arc-shaped guide groove is greater than the depth of the V-shaped guide groove.

[0016] Furthermore, the bottom of the arc-shaped guide trough has a sloping structure that transitions to the bottom of the V-shaped guide trough.

[0017] Furthermore, the width of the arc-shaped guide trough is greater than the width of the V-shaped guide trough.

[0018] Furthermore, a sleeve is provided between the mounting plate and the outer mold body in a fixed structure manner. The sleeve is fitted over the outside of the intermediate core rod, and the outer core rod is located at the lower part of the sleeve.

[0019] The feed inlet passes through the sleeve, the intermediate core rod, and is connected to the middle part of the arc-shaped guide groove.

[0020] Furthermore, a fixing rod connected to the second power component is provided above the mounting plate. The second power component is a discharge cylinder. A push rod is fixedly installed on the output shaft of the discharge cylinder. The push rod passes through the sleeve and is connected to the outer mandrel.

[0021] Furthermore, the discharge cylinder is fixedly connected to the first power component, which is a wall thickness adjustment cylinder.

[0022] The beneficial effects of this utility model are as follows: Two symmetrical V-shaped guide grooves are set on the outer circumference of the inner core rod, which transforms the rotational shear flow of the spiral flow channel into axial laminar flow, reducing bubble rupture and improving product quality; By limiting the shape and size of the arc-shaped guide groove and the V-shaped guide groove, a sudden change in the flow channel cross section is formed, which reduces shear stress and improves the foaming quality; The cross section design with a wider top and narrower bottom forms a unidirectional pressure gradient, preventing bubbles from overflowing and improving the product yield. Attached image description:

[0023] Figure 1 This is a three-dimensional cross-sectional view of the present invention.

[0024] Figure 2 This is a partial front view of the outer core rod structure of this utility model.

[0025] Figure 3 This is a right view of a partial structure of the outer core rod of this utility model.

[0026] Figure 4 This is a partial cross-sectional structural diagram of the outer mandrel of this utility model.

[0027] In the picture:

[0028] 1. Mounting plate, 2. Outer mold body, 3. Lower mold nozzle, 4. Inner mold body, 5. Core lifting rod, 6. First power component, 7. Inner core rod, 8. Middle core rod, 9. Outer core rod, 10. Second power component, 11. V-shaped guide groove, 12. Arc-shaped guide groove, 13. Feed port, 14. Sleeve, 15. Fixing rod, 16. Push rod. Detailed implementation method:

[0029] 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:

[0030] The supercritical fluid foaming blow molding machine single-layer foaming head includes a mounting plate 1. An outer mold body 2 is fixedly mounted on the lower part of the mounting plate 1. A lower mold nozzle 3 is located at the lower part of the outer mold body 2. An inner mold body 4 is located inside the lower mold nozzle 3. The inner mold body 4 is connected to a core-lifting rod 5 to drive the inner mold body 4 to move vertically. The core-lifting rod 5 is connected to a first power component 6. An inner core rod 7, a middle core rod 8, and an outer core rod 9 are sequentially fitted between the core-lifting rod 5 and the outer mold body 2 from the inside out. The upper ends of the inner core rod 7 and the middle core rod 8 are respectively connected to the mounting plate 1. The outer core rod 9 is fixedly connected to the second power component 10 so that it can slide vertically; the outer periphery of the inner core rod 7 is symmetrically provided with two V-shaped guide grooves 11, and the two ends of the two V-shaped guide grooves 11 are connected to each other, which transforms the rotational shear flow of the spiral flow channel into axial laminar flow, reduces bubble rupture, and improves product quality; the outer periphery of the inner core rod 7 above the V-shaped guide groove 11 is provided with an arc-shaped guide groove 12, which is connected to the end of the V-shaped guide groove 11, and is also provided with a feed port 13 connected to the arc-shaped guide groove 12.

[0031] Specifically, the arc-shaped guide channel 12 is deeper than the V-shaped guide channel 11. The bottom of the arc-shaped guide channel 12 has a sloping structure that transitions to the bottom of the V-shaped guide channel 11. By limiting the shape and size of the arc-shaped guide channel 12 and the V-shaped guide channel 11, a sudden change in the flow channel cross section is formed, which reduces shear stress and improves the quality of foaming.

[0032] It should be noted that the width of the arc-shaped guide groove 12 is greater than the width of the V-shaped guide groove 11. The depth of the V-shaped guide groove 11 gradually decreases to 0 from top to bottom. It adopts a cross-sectional design that is wider at the top and narrower at the bottom, and deeper at the top and shallower at the bottom, to form a unidirectional pressure gradient and improve the product yield.

[0033] It should be noted that a sleeve 14 is fixedly arranged between the mounting plate 1 and the outer mold body 2. The sleeve 14 is fitted outside the intermediate core rod 8, and the outer core rod 9 is located at the lower part of the sleeve 14. The feed port 13 passes through the sleeve 14, the intermediate core rod 8 and is connected to the middle part of the arc-shaped guide groove 12. The molten material mixed with supercritical gas enters the arc-shaped guide groove 12 through the feed port 13.

[0034] Specifically, a fixed rod 15 connected to the second power component 10 is provided above the mounting plate 1. The second power component 10 is a discharge cylinder. A push rod 16 is fixedly provided on the output shaft of the discharge cylinder. The push rod 16 passes through the sleeve 14 and is connected to the outer core rod 9. The discharge cylinder is fixedly connected to the first power component 6, which is a wall thickness adjustment cylinder.

[0035] The working principle and process of this utility model are as follows:

[0036] The molten material mixed with supercritical gas enters the arc-shaped guide channel 12 through the feed port 13. The molten material enters the V-shaped guide channel 11 through the arc-shaped guide channel 12, and then enters the storage bin. The wall thickness adjustment cylinder 6 is activated. The wall thickness adjustment cylinder 6 drives the inner mold body 4 to move through the core lifting rod. The material outlet between the inner mold body 4 and the lower mold nozzle 3 is opened. The discharge cylinder 10 is activated. The discharge cylinder 10 drives the outer core rod 9 through the push rod 16 to extrude the foamed molten material through the material outlet into the mold.

[0037] 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 single-layer foaming die head for a supercritical fluid foaming blow molding machine, characterized in that, include: Mounting plate (1), the lower part of mounting plate (1) is provided with an outer mold body (2) in a fixed structure, and the lower part of outer mold body (2) is provided with a lower mold nozzle (3). Inner mold body (4), the inner mold body (4) is set inside the lower mold nozzle (3); The core lifting rod (5) is connected to the inner mold body (4) to drive the inner mold body (4) to move vertically; The first power component (6) is connected to the core lifting rod (5) to drive its movement; Inner core rod (7), middle core rod (8) and outer core rod (9) are sequentially sleeved between the core lifting rod (5) and the outer mold body (2). The upper ends of the inner core rod (7) and the middle core rod (8) are fixedly connected to the mounting plate (1) respectively. The outer core rod (9) is slidably disposed vertically between the middle core rod (8) and the outer mold body (2). The second power component (10) is connected to the outer core rod (9) to drive its movement; V-shaped guide groove (11), two V-shaped guide grooves (11) are symmetrically opened on the outer circumferential surface of the inner core rod (7), and the two V-shaped guide grooves (11) are connected at both ends; Arc-shaped guide groove (12) is opened on the outer circumferential surface of the inner core rod (7) at the upper part of the V-shaped guide groove (11), and the arc-shaped guide groove (12) is connected to the end of the V-shaped guide groove (11); It is also equipped with a feed inlet (13) that communicates with the arc-shaped guide trough (12).

2. The single-layer foaming head of the supercritical fluid foaming blow molding machine according to claim 1, characterized in that: The depth of the arc-shaped guide groove (12) is greater than the depth of the V-shaped guide groove (11).

3. The single-layer foaming head of the supercritical fluid foaming blow molding machine according to claim 2, characterized in that: The bottom of the arc-shaped guide trough (12) has a sloping structure that transitions to the bottom of the V-shaped guide trough (11).

4. The single-layer foaming head of the supercritical fluid foaming blow molding machine according to claim 3, characterized in that: The width of the arc-shaped guide groove (12) is greater than the width of the V-shaped guide groove (11).

5. The single-layer foaming head of the supercritical fluid foaming blow molding machine according to claim 1, characterized in that: A sleeve (14) is provided between the mounting plate (1) and the outer mold body (2) in a fixed structure manner. The sleeve (14) is sleeved on the outside of the intermediate core rod (8), and the outer core rod (9) is located at the lower part of the sleeve (14). The feed inlet (13) passes through the sleeve (14), the intermediate core rod (8), and is connected to the middle part of the arc-shaped guide groove (12).

6. The single-layer foaming die head of the supercritical fluid foaming blow molding machine according to claim 5, characterized in that: A fixing rod (15) connected to the second power component (10) is provided above the mounting plate (1). The second power component (10) is a discharge cylinder. A push rod (16) is fixedly provided on the output shaft of the discharge cylinder. The push rod (16) passes through the sleeve (14) and is connected to the outer core rod (9).

7. The single-layer foaming die head of the supercritical fluid foaming blow molding machine according to claim 6, characterized in that: The discharge cylinder is fixedly connected to the first power component (6), which is a wall thickness adjustment cylinder.

Images