Adjustable wall thickness plastic bowl extrusion head

Abstract

The utility model belongs to the plastic extrusion forming technical field, concretely relates to a plastic bowl extrusion forming machine head of adjustable wall thickness, including first support board and the second support board of setting at first support board one side, be provided with circular protective casing fixedly on first support board, be provided with rotating assembly on circular protective casing, be provided with rotating rod in circular protective casing inside on rotating assembly, eight connecting rods are provided with on rotating rod outside, eight connecting rods are installed octagonal frame away from rotating rod one end, every edge of octagonal frame is set up and is installed groove, be provided with static mould in installation groove, be provided with forming machine head body on second support board, be installed dynamic mould on forming machine head body, the forming gap between dynamic mould and eight static moulds is not same when combining. The device can quickly, accurately adjust wall thickness, and simple operation, convenient maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of plastic extrusion molding technology, specifically relating to an adjustable wall thickness plastic bowl extrusion molding head. Background Technology

[0002] Plastic extrusion molding is a widely used plastic processing technology. Its principle is to continuously feed granular or powdered plastic raw materials into the extruder barrel. Under external heating and the mechanical action of the screw inside the barrel, the molten material is gradually melted into a viscous flow. With the help of the rotating screw, the molten material is pushed through a die with a specific shape in the die head, and a continuous body with the same cross-sectional shape as the die head is extruded. After cooling and solidification, it is pulled out by a traction device to obtain continuous plastic profile products, such as various films, hollow products, sheets, plates, pipes and various special-shaped materials.

[0003] In the production of plastic bowls, extrusion molding plays a crucial role. However, traditional plastic bowl extrusion molding machines have several limitations. For example, when producing plastic bowls with different wall thicknesses, the conventional approach is to manually change the mold after stopping the machine. This process is cumbersome, requiring specialized technicians to spend considerable time and effort on mold disassembly, installation, and adjustment, severely impacting production efficiency. Furthermore, frequent mold changes cause wear and tear on the mold itself, increasing production costs. In addition, traditional mold-changing methods lack flexibility, making it difficult to quickly adapt to the diverse market demands for plastic bowls with different wall thicknesses. This low production efficiency is particularly pronounced when dealing with small-batch, multi-variety orders.

[0004] Some existing technologies attempt to address the wall thickness adjustment problem through various means, such as employing complex mechanical structures to fine-tune the die gap. However, these methods generally suffer from insufficient adjustment precision. Because plastics are affected by numerous factors during extrusion, such as temperature and pressure, even minor adjustment errors can lead to uneven wall thickness in the final product, thus affecting product quality. Furthermore, these adjustment mechanisms are often complex in structure and have high maintenance costs, making them difficult to widely apply in actual production.

[0005] To address this, we propose an adjustable wall thickness plastic bowl extrusion head. This device can quickly and accurately adjust the wall thickness, and is simple to operate and easy to maintain. Utility Model Content

[0006] The purpose of this invention is to provide an adjustable wall thickness plastic bowl extrusion molding head. This device can quickly and accurately adjust the wall thickness, and is simple to operate and easy to maintain.

[0007] The specific technical solution adopted by this utility model is as follows: An adjustable-wall-thickness plastic bowl extrusion molding head includes a first support plate and a second support plate disposed on one side of the first support plate. A circular protective shell is fixedly disposed on the first support plate. A rotating assembly is disposed on the circular protective shell. A rotating rod is disposed on the rotating assembly located inside the circular protective shell. Eight connecting rods are disposed on the outside of the rotating rod. An octagonal frame is installed at the end of the eight connecting rods away from the rotating rod. Each side of the octagonal frame has an installation groove. A stationary mold is disposed inside the installation groove. A molding head body is disposed on the second support plate. A moving mold is installed on the molding head body. When the moving mold is combined with the eight stationary molds, the molding gaps between them are all different.

[0008] Furthermore, a working groove is provided on one side of the circular protective housing.

[0009] Furthermore, the rotating assembly includes a stepper motor mounted on the first support plate, the output end of which extends through the first support plate and the circular protective housing and is connected to the rotating rod.

[0010] Furthermore, a first threaded hole is provided on the inner wall of the bottom of the mounting groove, and a second threaded hole is provided on the stationary mold. Fixing bolts are provided inside the first threaded hole and the second threaded hole.

[0011] Furthermore, the octagonal frame has eight cavities, and each cavity contains a spiral water guide pipe. The inlet and outlet of the spiral water guide pipe are connected to an external water tank.

[0012] Furthermore, the forming head body includes a hydraulic cylinder fixedly mounted on the second support plate, an installation plate is mounted on the telescopic end of the hydraulic cylinder, a moving mold is mounted on the installation plate, and an extruder head is provided on the installation plate, with the extruder head communicating with the moving mold.

[0013] Furthermore, the working groove is provided with a removable sealing plate.

[0014] The technical effects achieved by this utility model are as follows: 1. This device allows for quick and precise adjustment of wall thickness by switching between multiple sets of molds, and it is simple to operate and easy to maintain.

[0015] 2. This device can produce 8 different wall thicknesses from one machine head, which can meet the needs of small batch and multi-specification orders.

[0016] 3. Each static mold has its own dedicated spiral water guide pipe, which has high cooling efficiency and does not interfere with each other. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the circular protective shell of this utility model; Figure 3 This is a schematic diagram of the static mold of this utility model; Figure 4 This is a schematic diagram of the structure of the moving mold of this utility model.

[0018] The attached diagram lists the components represented by each number as follows: 1. First support plate; 2. Second support plate; 3. Circular protective shell; 4. Rotating rod; 5. Connecting rod; 6. Octagonal frame; 7. Mounting groove; 8. Static mold; 9. Moving mold; 10. Working groove; 11. Stepper motor; 12. Fixing bolt; 13. Cavity; 14. Spiral water guide pipe; 15. Hydraulic cylinder; 16. Mounting plate; 17. Extruder head. Detailed Implementation

[0019] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0020] like Figures 1-4 As shown, an adjustable wall thickness plastic bowl extrusion molding head includes a first support plate 1 and a second support plate 2 disposed on one side of the first support plate 1. A circular protective shell 3 is fixedly disposed on the first support plate 1. A rotating assembly is disposed on the circular protective shell 3. A rotating rod 4 is disposed on the rotating assembly inside the circular protective shell 3. Eight connecting rods 5 are disposed on the outside of the rotating rod 4. An octagonal frame 6 is installed at the end of the eight connecting rods 5 away from the rotating rod 4. Each side of the octagonal frame 6 has an installation groove 7. A stationary mold 8 is disposed inside the installation groove 7. A molding head body is disposed on the second support plate 2. A moving mold 9 is installed on the molding head body. When the moving mold 9 is combined with the eight stationary molds 8, the molding gaps between them are different.

[0021] The circular protective shell 3 has a working groove 10 on one side, through which the moving mold 9 and the stationary mold 8 are combined to manufacture the plastic bowl.

[0022] Meanwhile, the rotating assembly includes a stepper motor 11 mounted on the first support plate 1. The output end of the stepper motor 11 passes through the first support plate 1 and the circular protective shell 3 and is connected to the rotating rod 4. The stepper motor 11 drives the rotating rod 4 to rotate step by step, thereby allowing the replacement of different stationary molds 8 to realize the manufacturing of plastic bowls with different wall thicknesses.

[0023] The mounting groove 7 has a first threaded hole on its bottom inner wall and the stationary mold 8 has a second threaded hole. Fixing bolts 12 are installed inside the first and second threaded holes. This arrangement allows the stationary mold 8 to be installed and removed.

[0024] The octagonal frame 6 has eight cavities 13, and each cavity 13 is equipped with a spiral water guide pipe 14. The inlet and outlet of the spiral water guide pipe 14 are connected to an external water tank. When the stationary mold 8 corresponding to each cavity 13 is working, the inlet and outlet of the spiral water guide pipe 14 are connected to the external water tank, which can cool down the working stationary mold 8.

[0025] The spiral water pipe 14 has a detachable connection between its inlet and outlet and the external water tank. The connection method is either a snap-fit ​​or a threaded connection, which facilitates the installation and removal of the external water tank.

[0026] The forming head body includes a hydraulic cylinder 15 fixedly mounted on the second support plate 2. The extension end of the hydraulic cylinder 15 is equipped with a mounting plate 16. A moving mold 9 is mounted on the mounting plate 16, and an extruder head 17 is provided on the mounting plate 16. The extruder head 17 is connected to the moving mold 9.

[0027] The hydraulic cylinder 15 moves the moving mold 9 to form a molding gap between it and the stationary mold 8. The molten plastic is ejected from the moving mold 9 through the extruder head 17 and enters the gap between the moving mold 9 and the stationary mold 8 for molding.

[0028] The working groove 10 is equipped with a removable sealing plate (not shown in the figure). The sealing plate can seal the stationary mold 8 when it is not in operation to prevent damage.

[0029] The working principle of this utility model is as follows: When it is necessary to change the wall thickness of the production bowl, the operator starts the rotating component. The rotating component drives the rotating rod 4 to rotate. The rotating rod 4 drives the entire octagonal frame 6 to rotate around the moving mold 9 through eight evenly distributed connecting rods 5 on its outer side. The rotation of the octagonal frame 6 causes the different stationary molds 8 installed on its eight sides to move sequentially to the working position directly opposite the moving mold 9. After the rotation stops, the stationary mold 8 with the preset required gap (i.e., the required wall thickness) is precisely positioned directly opposite the moving mold 9 and is in working condition. Once the target stationary mold 8 is positioned (combined with the moving mold 9 to form the required specific gap), the molten plastic is extruded from the molding head body. The molten material flows through an annular forming gap of a specific width, formed by the outer surface of the moving mold 9 and the inner surface of the currently working stationary mold 8. In this gap, the plastic is extruded to form a tubular bowl blank. The width of the forming gap directly determines the thickness of the extruded plastic, which is the final wall thickness of the plastic bowl. A wider gap results in a thicker wall, and a narrower gap results in a thinner wall. When it is necessary to produce a bowl with a different wall thickness, simply restart the rotating component to rotate the octagonal frame 6 to the next position (usually by 45 degrees), so that the stationary mold 8 corresponding to the new wall thickness moves to the working position. This process can usually be completed in a short time (seconds) without disassembling the mold or stopping the machine for a long time, which greatly improves the flexibility and efficiency of production.

[0030] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. An adjustable wall thickness plastic bowl extrusion molding head, comprising a first support plate (1) and a second support plate (2) disposed on one side of the first support plate (1), characterized in that: A circular protective shell (3) is fixedly installed on the first support plate (1). A rotating assembly is installed on the circular protective shell (3). A rotating rod (4) is installed on the rotating assembly inside the circular protective shell (3). Eight connecting rods (5) are installed on the outside of the rotating rod (4). An octagonal frame (6) is installed at one end of the eight connecting rods (5) away from the rotating rod (4). Each side of the octagonal frame (6) is provided with an installation groove (7). A stationary mold (8) is installed inside the installation groove (7). A molding head body is installed on the second support plate (2). A moving mold (9) is installed on the molding head body. The molding gaps between the moving mold (9) and the eight stationary molds (8) are different.

2. The adjustable wall thickness plastic bowl extrusion head according to claim 1, characterized in that: A working groove (10) is provided on one side of the circular protective shell (3).

3. The adjustable wall thickness plastic bowl extrusion head according to claim 1, characterized in that: The rotating assembly includes a stepper motor (11) mounted on the first support plate (1). The output end of the stepper motor (11) passes through the first support plate (1) and the circular protective shell (3) and is connected to the rotating rod (4).

4. The adjustable wall thickness plastic bowl extrusion head according to claim 1, characterized in that: The mounting groove (7) has a first threaded hole on its bottom inner wall and the stationary mold (8) has a second threaded hole. Fixing bolts (12) are provided inside the first threaded hole and the second threaded hole.

5. The adjustable wall thickness plastic bowl extrusion head according to claim 1, characterized in that: The octagonal frame (6) has eight cavities (13), and each cavity (13) is equipped with a spiral water guide pipe (14). The inlet and outlet of the spiral water guide pipe (14) are connected to an external water tank.

6. The adjustable wall thickness plastic bowl extrusion head according to claim 1, characterized in that: The forming head body includes a hydraulic cylinder (15) fixedly mounted on the second support plate (2). The extension end of the hydraulic cylinder (15) is equipped with an installation plate (16). A moving mold (9) is mounted on the installation plate (16), and an extruder head (17) is provided on the installation plate (16). The extruder head (17) is connected to the moving mold (9).

7. The adjustable wall thickness plastic bowl extrusion head according to claim 2, characterized in that: The working groove (10) is provided with a removable sealing plate.

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