Improved double-screw plastic extrusion equipment

Abstract

The utility model discloses improved double-screw plastic extrusion equipment which comprises a heating pipe, a driving motor, a feeding bin, an extrusion molding die head, extrusion molding screws and an electric heating piece, the driving motor and the feeding bin are arranged at the feeding end of the heating pipe, the extrusion molding die head is arranged at the discharging end of the heating pipe, and the two extrusion molding screws are arranged in the heating pipe and connected with the driving motor. The heating pieces are axially arranged on the inner wall of the heating pipe, an outer sleeve is coaxially arranged outside the heating pipe, and a heat dissipation pipe coaxial with the heating pipe is arranged between the outer sleeve and the heating pipe. According to the utility model, the heat dissipation effect can be obviously improved, the problems of insufficient melting of raw materials, easiness in remaining in the hopper and blockage and discontinuity of discharging are solved, the melting temperature of the raw materials is controlled more accurately and stably, and the extrusion continuity is good; and the crushing cutter wheel is arranged to crush and recycle plastic blocks, so that the problems that feeding is not smooth enough and the screw conveying difficulty is high are solved, the feeding speed is effectively guaranteed, the manual cleaning and troubleshooting rate is reduced, and the plasticizing extrusion effect and efficiency are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic melting and extrusion, in particular to an improved twin-screw plastic extrusion device. Background Art

[0002] Existing plastic extrusion granulation machines generally use single-screw extruders. Since the recycled plastic blocks are light and loose, the feeding is not smooth enough and is easy to accumulate at the feeding end of the extruder, which affects the feeding speed, making the screw conveying difficult and requiring manual cleaning at regular intervals, affecting the plasticizing effect and the performance of the obtained plastic particles is not ideal. In addition, the heating pipe of the extruder is not convenient for heat dissipation, the heat dissipation temperature is uneven, and it is difficult to control, resulting in insufficient melting of the raw materials, which are easy to remain in the hopper, and the discharging is stuck and discontinuous, making the entire plastic recycling granulation process less efficient. Utility Model Content

[0003] The utility model provides an improved twin-screw plastic extrusion device.

[0004] The utility model is realized through the following technical scheme: it comprises a heating tube, a driving motor, a feeding bin, an extrusion die head, an extrusion screw rod and an electric heating element. The driving motor and the feeding bin are arranged at the feeding end of the heating tube, the extrusion die head is arranged at the discharging end, two extrusion screw rods are arranged in the heating tube and connected with the driving motor, there are a plurality of heating elements, which are axially arranged on the inner wall of the heating tube, an outer sleeve is coaxially arranged outside the heating tube, and a plurality of partition ring plates are axially arranged between the two, the partition ring plates divide the space between the heating tube and the outer sleeve into a plurality of independent heat dissipation chambers, a heat dissipation tube coaxial with the heating tube is arranged in each heat dissipation chamber, an air inlet and a liquid inlet are arranged at one end of the top of each heat dissipation chamber, an exhaust port and a liquid discharge port are arranged at the other end of the bottom, the air inlet and the exhaust port are respectively connected to the heat dissipation tube, and the liquid inlet and the liquid discharge port are connected to the heat dissipation chamber.

[0005] Furthermore, each extrusion screw below the feed bin is provided with a mutually cooperating annular structured crushing wheel, a partition is provided on the left side of the crushing wheel, and each extrusion screw passes through the partition to be connected to a driving motor.

[0006] The beneficial effects of the utility model are as follows: 1. The utility model improves the heating tube, adopts segmented heat dissipation, and combines liquid cooling and air cooling to significantly improve the heat dissipation effect, overcome the problem of insufficient melting of raw materials, easy residue in the hopper, and discontinuous discharge, so that the raw material melting temperature control is more accurate and stable, the extrusion continuity is good, and the heat dissipation effect is better;

[0007] 2. A crushing wheel is set at one end of the feed port to break up the recycled plastic blocks, which solves the problem that the plastic blocks are easily accumulated at the feed end of the extruder, resulting in unsmooth feeding and difficulty in screw conveying. It effectively guarantees the feeding speed, reduces the manual cleaning and troubleshooting rate, and greatly improves the plasticizing extrusion effect and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the utility model;

[0009] Figure 2 It is a schematic diagram of the top view of the heating tube;

[0010] Figure 3 It is a schematic diagram of the structure of the heating tube and the outer sleeve;

[0011] Numbers in the figure: 1~heating tube, 2~driving motor, 3~feeding bin, 4~extrusion die head, 5~extrusion screw, 6~electric heating element, 7~outer sleeve, 8~separation ring plate, 9~heat dissipation chamber, 10~heat dissipation tube, 11~air inlet, 12~liquid inlet, 13~exhaust port, 14~liquid discharge port, 15~crushing cutter wheel, 16~partition plate. DETAILED DESCRIPTION

[0012] In order to enable those skilled in the art to better understand the technical solution of the utility model, its specific implementation method is described in detail below with reference to the accompanying drawings.

[0013] like Figures 1 to 3 The improved twin-screw plastic extrusion equipment shown includes a heating tube 1, a driving motor 2, a feeding bin 3, an extrusion die 4, an extrusion screw 5, and an electric heating element 6. The driving motor 2 and the feeding bin 3 are arranged at the feeding end of the heating tube 1, and the extrusion die 4 is arranged at the discharging end. Two extrusion screws 5 are arranged in the heating tube 1 and connected to the driving motor 2. There are several heating elements, which are axially arranged on the inner wall of the heating tube 1. An outer sleeve 7 is coaxially arranged outside the heating tube 1, and several dividing ring plates 8 are axially arranged between the two. The dividing ring plates 8 divide the space between the heating tube 1 and the outer sleeve 7 into several independent heat dissipation chambers 9. A heat dissipation tube 10 coaxial with the heating tube 1 is arranged in each heat dissipation chamber 9. An air inlet 11 and a liquid inlet 12 are arranged at one end of the top of each heat dissipation chamber 9, and an exhaust port 13 and a liquid discharge port 14 are arranged at the other end of the bottom. The air inlet 11 and the exhaust port 13 are respectively connected to the heat dissipation tube 10, and the liquid inlet 12 and the liquid discharge port 14 are connected to the heat dissipation chamber 9.

[0014] The heat dissipation pipe 10 is arranged in a spiral structure.

[0015] There are at least three separation ring plates 8 , which are sealed and connected to the heating tube 1 and the outer sleeve 7 .

[0016] Each extrusion screw 5 below the feed bin 3 is provided with a mutually matching annular structure crushing wheel 15, and a partition plate 16 is provided on the left side of the crushing wheel 15. Each extrusion screw 5 passes through the partition plate 16 and is connected to the drive motor 2.

[0017] The crushing wheel 15 is configured in a gear-like structure.

[0018] It also includes a fan, which is connected to each air inlet 11 through a pipeline and a valve.

[0019] The device further comprises a refrigeration system, which connects the liquid inlets 12 and the liquid outlets 14 via pipelines.

[0020] The working method of the utility model is as follows: the plastic fragments to be melted are placed in the feed bin 3, enter the feed end of the heating tube 1 through the feed bin 3, and then contact the crushing wheel 15, which further breaks the plastic fragments. Then, driven by the two extrusion screws 5, the plastic fragments are heated and melted by the electric heating element 6 in the heating tube 1, and finally extruded and discharged from the extrusion die 4 at the discharge end of the heating tube 1.

[0021] During the operation of the heating tube 1 and the electric heating element 6, the refrigeration system is started to transport low-temperature or normal-temperature heat exchange fluid to each heat dissipation chamber 9 to dissipate heat from the heating tube 1, thereby controlling the melting temperature of the plastic in the heating tube 1 to ensure the stability of temperature changes; in order to further improve the heat dissipation effect and control accuracy, a low-temperature or normal-temperature gas is transported to each heat dissipation tube 10 through a fan, and the refrigeration system is used to dissipate heat and control the temperature of the heating tube 1. While lowering the temperature of the heat exchange fluid, the heat dissipation tube 10 can also lower the temperature of the heating tube 1, further ensuring the stability and continuity of temperature changes. During operation, the fan or refrigeration system can be controlled to operate independently, or the two can be controlled to operate jointly to dissipate heat and cool down.

Claims

1. An improved twin-screw plastic extrusion device, comprising a heating tube (1), a driving motor (2), a feed bin (3), an extrusion die (4), an extrusion screw (5), and an electric heating element (6). The driving motor (2) and the feeding bin (3) are arranged at the feed end of the heating tube (1), and the extrusion die (4) is arranged at the discharge end. Two extrusion screws (5) are arranged in the heating tube (1) and connected to the driving motor (2). There are a plurality of heating elements, which are axially arranged on the inner wall of the heating tube (1), and are characterized in that: An outer sleeve (7) is coaxially arranged outside the heating tube (1), and a plurality of partition ring plates (8) are axially arranged between the two. The partition ring plates (8) divide the space between the heating tube (1) and the outer sleeve (7) into a plurality of independent heat dissipation chambers (9). A heat dissipation pipe (10) coaxial with the heating tube (1) is arranged in each heat dissipation chamber (9). An air inlet (11) and a liquid inlet (12) are arranged at one end of the top of each heat dissipation chamber (9), and an air outlet (13) and a liquid outlet (14) are arranged at the other end of the bottom. The air inlet (11) and the air outlet (13) are respectively connected to the heat dissipation pipe (10), and the liquid inlet (12) and the liquid outlet (14) are connected to the heat dissipation chamber (9).

2. The improved twin-screw plastic extruder according to claim 1, characterized in that: The heat dissipation pipe (10) is arranged in a spiral structure.

3. The improved twin-screw plastic extruder according to claim 1, characterized in that: At least three separating ring plates (8) are provided, and are sealedly connected to the heating tube (1) and the outer sleeve (7).

4. The improved twin-screw plastic extruder according to claim 1, characterized in that: Each extrusion screw (5) below the feed bin (3) is provided with a mutually matching annular structure crushing wheel (15), a partition (16) is provided on the left side of the crushing wheel (15), and each extrusion screw (5) passes through the partition (16) and is connected to the drive motor (2).

5. The improved twin-screw plastic extruder according to claim 4, characterized in that: The crushing blade wheel (15) is arranged in a gear-like structure.

6. The improved twin-screw plastic extruder according to claim 1, characterized in that: It also includes a fan, which is connected to each air inlet (11) through a pipeline and a valve.

7. The improved twin-screw plastic extruder according to claim 1, characterized in that: It also includes a refrigeration system, which connects the liquid inlets (12) and the liquid outlets (14) via pipelines.

Images