Double-screw extruder for HDPE (high-density polyethylene) plastic bottles

Abstract

The utility model provides an HDPE plastic bottle twin-screw extruder, and relates to the field of HDPE plastic bottle production, the HDPE plastic bottle twin-screw extruder comprises an HDPE plastic extruder and a feed hopper, the feed hopper is fixedly installed on the upper end face of the HDPE plastic extruder, a first screw and a second screw are installed on the inner side of the HDPE plastic extruder, and the first screw and the second screw are connected with the feed hopper. The right sides of the first screw and the second screw are connected with a gear transmission mechanism through couplings, the right side of the gear transmission mechanism is in shaft connection with a servo motor, the feeding hopper is connected with a transmission column through a fixed top cover, a positioning disc is fixedly installed at the lower end of the transmission column, and the upper end of the transmission column is in shaft connection with a small motor. Electric heating rods are installed on the lower end face of the positioning disc at equal intervals, and a cutting blade is installed between the transmission column and the positioning disc in a clamped mode. The problems that in the prior art, the temperature of raw materials entering from a feeding hopper is low, the temperature in an extruder is easily reduced, the extrusion duration is prolonged, and the extrusion efficiency is reduced are solved.

Description

Technical Field

[0001] This utility model relates to the field of HDPE plastic bottle production technology, specifically to a twin-screw extruder for HDPE plastic bottles. Background Technology

[0002] HDPE plastic bottles are bottles made of high-density polyethylene material. HDPE plastic bottles have good crystallinity and high density, generally ranging from 0.941 to 0.965 g / cm³. 3 Between 1. This material is lightweight, colorless and odorless, chemically stable, and not easily affected by acid, alkali solutions and organic solvents. It also has certain cold resistance and moisture barrier properties. It is often used in chemical experiments, inspection and testing, production experiments, scientific research and analysis, etc. It is a common plastic storage or packaging container. In production, a twin-screw extruder is used to mix and extrude HDPE plastic bottle raw materials. After searching, the existing technology (announcement number: CN202222469648.6) is a twin-screw extruder for PE plastic bottle production. The article describes that "when it is necessary to process plastic raw materials, first pour the plastic raw materials into the feed hopper, start the motor to drive the third belt pulley to rotate, and in The fourth pulley and the second transmission belt drive the round rod to rotate. The round rod drives the crushing blades to crush the plastic raw material in the feed hopper, so that the crushed plastic raw material can be quickly heated and melted, which is convenient for subsequent extrusion molding. Crushing the plastic raw material also prevents the plastic raw material from clogging in the feed hopper and affecting the feeding effect. By setting an electric heating wire layer between the outer shell and the inner shell of the feed hopper, the plastic raw material entering the inner shell of the feed hopper can be heated, so that the plastic raw material can be quickly melted. However, in the existing technology, the temperature of the raw material entering from the feed hopper is relatively low, which can easily lead to a drop in the temperature inside the extruder, resulting in a longer extrusion time and a reduced extrusion efficiency. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a twin-screw extruder for HDPE plastic bottles is provided to solve the problem that the raw material entering from the feed hopper is at a low temperature, which easily leads to a drop in temperature inside the extruder, resulting in longer extrusion time and reduced extrusion efficiency.

[0004] To achieve the above objectives, a twin-screw extruder for HDPE plastic bottles is provided, comprising: an HDPE plastic extruder and a feed hopper, wherein the feed hopper is fixedly installed on the upper end face of the HDPE plastic extruder.

[0005] The HDPE plastic extruder has a first screw and a second screw installed inside. The right side of the first screw and the second screw is connected to a gear transmission mechanism via a coupling. A servo motor is shafted to the right side of the gear transmission mechanism. The feed hopper is connected to a transmission column via a fixed top cover. A positioning plate is fixedly installed at the lower end of the transmission column. A small motor is shafted to the upper end of the transmission column. Electric heating rods are equidistantly installed on the lower end face of the positioning plate. A cutting blade is clamped between the transmission column and the positioning plate.

[0006] Furthermore, a CNC cabinet is fixedly supported at the lower end of the HDPE plastic extruder, and a fixed cover plate is screwed onto the right end face of the HDPE plastic extruder.

[0007] Furthermore, a servo motor is fixed to the right side of the fixed cover plate; and a gear transmission mechanism is connected to the inner side of the fixed cover plate, and an extrusion port is provided on the left end face of the HDPE plastic extruder.

[0008] Furthermore, a discharge port is provided on the upper right side of the HDPE plastic extruder, and the lower end of the feed hopper is connected to the inside of the HDPE plastic extruder through the discharge port.

[0009] Furthermore, the HDPE plastic extruder is equipped with an electric heating layer inside; and the electric heating layer is distributed in a ring at the outer ends of the first screw and the second screw.

[0010] Furthermore, a fixed top cover is fastened to the upper end face of the feed hopper, and a small motor is fixed on the upper surface of the fixed top cover. Feed inlets are provided on the left and right sides of the small motor.

[0011] Furthermore, the positioning disk has four sets of fixing holes on its surface; and studs through the lower surface of the transmission column pass through the fixing holes. The upper surface of the positioning disk is connected to the cutting blade through the positioning column, and the positioning disk is screwed to the studs on the lower surface of the transmission column through the fixing nut.

[0012] The beneficial effects of this utility model are as follows: The HDPE plastic bottle twin-screw extruder of this utility model utilizes an electric heating rod, transmission column, positioning plate, small motor, and cutting blade in the feed hopper to form a cutting and preheating structure. The rotating cutting blade further cuts the various raw materials added, and the shredded and falling raw materials come into contact with the synchronously rotating electric heating rod for heating. This facilitates preheating and raises the temperature of the plastic raw materials entering the twin-screw extruder, reduces the temperature difference during heating and mixing extrusion in the twin-screw extruder, facilitates reasonable control of temperature changes within the twin-screw extruder, ensures the extrusion processing quality of HDPE plastic bottle raw materials, shortens the heating and extrusion time of the twin-screw extruder, and improves the extrusion efficiency of the twin-screw extruder. Attached Figure Description

[0013] Figure 1This is a front view structural diagram of the twin-screw extruder for HDPE plastic bottles according to an embodiment of the present invention.

[0014] Figure 2 This is a front view cross-sectional structural diagram of the twin-screw extruder for HDPE plastic bottles according to an embodiment of the present invention.

[0015] Figure 3 This is a front view cross-sectional structural diagram of the feed hopper according to an embodiment of the present utility model.

[0016] Figure 4 This is a top view partial cross-sectional diagram of the connection structure of the positioning disk and the cutting blade in an embodiment of the present invention.

[0017] Figure 5 This is a three-dimensional schematic diagram of the connection structure between the electric heating rod and the positioning plate in an embodiment of this utility model.

[0018] In the diagram: 1. HDPE plastic extruder; 11. Extrusion nozzle; 12. Fixed cover plate; 13. Electric heating layer; 14. Discharge port; 2. CNC cabinet; 3. Feed hopper; 31. Fixed top cover; 32. Feed port; 4. First screw; 41. Second screw; 42. Servo motor; 43. Gear transmission mechanism; 44. Coupling; 5. Electric heating rod; 51. Transmission column; 52. Positioning plate; 53. Small motor; 54. Fixing nut; 55. Positioning column; 56. Fixing hole; 6. Cutting blade. Detailed Implementation

[0019] Reference Figures 1 to 5 As shown, this utility model provides a twin-screw extruder for HDPE plastic bottles, including: an HDPE plastic extruder 1 and a feed hopper 3, wherein the feed hopper 3 is fixedly installed on the upper end face of the HDPE plastic extruder 1.

[0020] The HDPE plastic extruder 1 has a first screw 4 and a second screw 41 installed inside. The right side of the first screw 4 and the second screw 41 is connected to a gear transmission mechanism 43 via a coupling 44. A servo motor 42 is shaft-connected to the right side of the gear transmission mechanism 43. The feed hopper 3 is connected to a transmission column 51 via a fixed top cover 31. A positioning plate 52 is fixedly installed at the lower end of the transmission column 51. A small motor 53 is shaft-connected to the upper end of the transmission column 51. Electric heating rods 5 are equidistantly installed on the lower end face of the positioning plate 52. A cutting blade 6 is clamped and installed between the transmission column 51 and the positioning plate 52.

[0021] First, the inside of the HDPE plastic extruder 1 is heated to a suitable temperature. The servo motor 42 and the small motor 53 are started, and various HDPE plastic bottle raw materials are poured in from the feed port 32 of the feed hopper 3. The poured HDPE plastic bottle raw materials are further cut by the rotating blades. The cut HDPE plastic bottle raw materials are moved to the electric heating rod 5 and come into contact with the synchronously rotating electric heating rod 5. The HDPE plastic bottle raw materials that come into contact with the electric heating rod 5 are heated and fall into the HDPE plastic extruder 1. At this time, the first screw 4 and the second screw 41 mix and heat the incoming HDPE plastic bottle raw materials and then convey them to the left end extrusion port 11 for extrusion, thus completing the mixed extrusion processing of HDPE plastic bottle material.

[0022] In this embodiment, a CNC cabinet 2 is fixedly supported at the lower end of the HDPE plastic extruder 1, and a fixed cover plate 12 is screwed onto the right end face of the HDPE plastic extruder 1. A servo motor 42 is fixed on the right side of the fixed cover plate 12; and a gear transmission mechanism 43 is connected to the inner side of the fixed cover plate 12. An extrusion port 11 is provided on the left end face of the HDPE plastic extruder 1.

[0023] In a preferred embodiment, the electrical equipment inside the CNC cabinet 2 facilitates the control of the HDPE plastic extruder 1. The gear transmission mechanism 43 facilitates the meshing transmission of the first screw 4 and the second screw 41. The extrusion port 11 facilitates the extrusion of the mixed and heated HDPE plastic bottle raw material.

[0024] In this embodiment, a discharge port 14 is provided on the upper right side of the HDPE plastic extruder 1, and the lower end of the feed hopper 3 is connected to the inner side of the HDPE plastic extruder 1 through the discharge port 14.

[0025] In a preferred embodiment, the discharge port 14 facilitates the introduction of the further cut and preheated HDPE plastic bottle raw material from the feed hopper 3 into the first screw 4 and the second screw 41 of the drive. The further cut and preheated HDPE plastic bottle raw material helps to mitigate the temperature difference during heating and mixing extrusion of the HDPE plastic extruder 1, making it easier to reasonably control the temperature change inside the HDPE plastic extruder 1, ensuring the extrusion processing quality of the HDPE plastic bottle raw material, and shortening the heating and extrusion time of the HDPE plastic extruder 1.

[0026] In this embodiment, an electric heating layer 13 is provided inside the HDPE plastic extruder 1; and the electric heating layer 13 is distributed in a ring at the outer ends of the first screw 4 and the second screw 41. A fixed top cover 31 is fastened to the upper end face of the feed hopper 3, and a small motor 53 is fixed on the upper surface of the fixed top cover 31. Feed ports 32 are provided on the left and right sides of the small motor 53.

[0027] In a preferred embodiment, the electric heating layer 13 heats the mixed extruded raw material inside the HDPE plastic extruder 1, thereby controlling the temperature inside the HDPE plastic extruder 1 within a reasonable heating range. The small motor 53 easily drives the transmission column 51 to rotate, thus causing the cutting blade 6 and the electric heating rod 5 to rotate synchronously, cutting and preheating the incoming HDPE plastic bottle raw material, reducing heat exchange between the raw material and the HDPE plastic extruder 1.

[0028] In this embodiment, four sets of fixing holes 56 are provided on the surface of the positioning disk 52; and the studs of the lower surface of the transmission column 51 pass through the fixing holes 56. The upper surface of the positioning disk 52 is connected to the cutting blade 6 through the positioning column 55, and the positioning disk 52 is screwed to the studs on the lower surface of the transmission column 51 through the fixing nut 54.

[0029] In a preferred embodiment, eight cutting blades 6 are installed between the positioning plates 52 and 52, and the eight cutting blades 6 are fixed by studs and positioning pins 55 to prevent the cutting blades 6 from loosening or detaching during rotation. The drive pin 51 is used to drive the cutting blades 6 and the lower electric heating rod 5 to rotate, cutting and heating the HDPE raw material in the feed hopper 3. The synchronously rotating electric heating rod 5 can fully contact the falling HDPE raw material, ensuring uniform preheating of the HDPE raw material in the feed hopper 3, facilitating the raising of the temperature of the HDPE raw material entering the extruder, reducing the temperature difference during heating and mixing extrusion of the HDPE plastic extruder 1, ensuring the extrusion processing quality of HDPE plastic bottle raw material, shortening the heating and extrusion time of the HDPE plastic extruder 1, and improving the extrusion efficiency of the HDPE plastic extruder 1.

[0030] This utility model of a twin-screw extruder for HDPE plastic bottles effectively solves the problem in existing technologies where the raw material entering from the hopper is often too cold, leading to a drop in temperature inside the extruder, resulting in prolonged extrusion time and reduced extrusion efficiency. It facilitates preheating to raise the temperature of the plastic raw material entering the twin-screw extruder, mitigating the temperature difference during heating and mixing extrusion. This allows for easier and more reasonable control of temperature changes within the twin-screw extruder, ensuring the quality of HDPE plastic bottle raw material extrusion, shortening the heating and extrusion time, and improving the extrusion efficiency of the twin-screw extruder. It is suitable for twin-screw extruders of HDPE plastic bottles.

Claims

1. A twin-screw extruder for HDPE plastic bottles, comprising: An HDPE plastic extruder (1) and a feed hopper (3), wherein the feed hopper (3) is fixedly installed on the upper end face of the HDPE plastic extruder (1), characterized in that: The HDPE plastic extruder (1) is equipped with a first screw (4) and a second screw (41) on its inner side. The first screw (4) and the second screw (41) are connected to a gear transmission mechanism (43) via a coupling (44) on their right sides. A servo motor (42) is shaft-connected to the right side of the gear transmission mechanism (43). The feed hopper (3) is connected to a transmission column (51) via a fixed top cover (31). A positioning plate (52) is fixedly installed at the lower end of the transmission column (51). A small motor (53) is shaft-connected to the upper end of the transmission column (51). Electric heating rods (5) are equidistantly installed on the lower end face of the positioning plate (52). A cutting blade (6) is clamped between the transmission column (51) and the positioning plate (52).

2. The twin-screw extruder for HDPE plastic bottles according to claim 1, characterized in that, The HDPE plastic extruder (1) is fixedly supported by a CNC cabinet (2) at its lower end, and a fixed cover plate (12) is screwed onto the right end face of the HDPE plastic extruder (1).

3. The twin-screw extruder for HDPE plastic bottles according to claim 2, characterized in that, A servo motor (42) is fixed on the right side of the fixed cover plate (12); and a gear transmission mechanism (43) is connected to the inside of the fixed cover plate (12). An extrusion port (11) is provided on the left end face of the HDPE plastic extruder (1).

4. The twin-screw extruder for HDPE plastic bottles according to claim 1, characterized in that, The HDPE plastic extruder (1) has a discharge port (14) on the upper right side, and the lower end of the feed hopper (3) is connected to the inside of the HDPE plastic extruder (1) through the discharge port (14).

5. The twin-screw extruder for HDPE plastic bottles according to claim 1, characterized in that, The HDPE plastic extruder (1) is provided with an electric heating layer (13); and the electric heating layer (13) is distributed in a ring at the outer ends of the first screw (4) and the second screw (41).

6. The twin-screw extruder for HDPE plastic bottles according to claim 1, characterized in that, The upper end face of the feed hopper (3) is fastened with a fixed top cover (31), and a small motor (53) is fixed on the upper surface of the fixed top cover (31). The small motor (53) has feed inlets (32) on its left and right sides.

7. The twin-screw extruder for HDPE plastic bottles according to claim 1, characterized in that, The positioning disk (52) has four sets of fixing holes (56) on its surface; and the fixing holes (56) are filled with studs on the lower surface of the transmission column (51). The upper surface of the positioning disk (52) is connected to the cutting blade (6) through the positioning column (55), and the positioning disk (52) is screwed to the studs on the lower surface of the transmission column (51) through the fixing nut (54).

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