Multi-screw plastic extruder

Abstract

The multi-screw plastic extruder comprises a base, a single-screw cylinder and a double-screw cylinder, heating cylinders are arranged on the outer wall of the single-screw cylinder and the outer wall of the double-screw cylinder, the tail of the single-screw cylinder is communicated with the head of the double-screw cylinder, a feeding port is formed in the head of the single-screw cylinder, and a discharging port is formed in the tail of the double-screw cylinder. An extrusion opening is formed in the tail portion of the double-screw barrel, a first screw is arranged in the single-screw barrel, two second screws are arranged in the double-screw barrel, and driving assemblies are arranged on the single-screw barrel and the double-screw barrel and used for driving the screws. And the output is improved while the plasticizing effect is not influenced, so that the application range of the extruder is wider.

Description

Technical Field

[0001] The utility model relates to the field of plastic production equipment, in particular to a multi-screw plastic extruder. Background Art

[0002] With the development of society, the application of plastic extruders is becoming more and more extensive. In the process of plastic production, we must explore and master the skills according to the performance of the machine and practice to continuously improve the quality and process of plastic products.

[0003] Existing plastic extruders are generally divided into single-screw extruders and twin-screw extruders according to the number of screws. Among them, the single-screw extruder has a large extrusion force, is suitable for processing raw materials of various structures, and has a wide range of applications, but the mixing and stability of the single-screw extruder are poor, and it is not suitable for processing plastics with poor stability, nor for blending. The twin-screw extruder has the advantages of less heat generated by friction, more uniform shearing of the material, more stable extrusion volume, longer material residence time in the barrel, and uniform mixing, and has also been widely used, but the twin-screw extruder also has certain disadvantages. The extrusion force of the twin-screw is small during feeding, which is suitable for powder processing. For larger particles and other raw materials, the feeding speed is limited, which affects the plastic extrusion output. This is an existing problem. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a multi-screw plastic extruder, which combines the advantages of a single screw and a twin screw to improve the above-mentioned problems.

[0005] The utility model is realized through the following technical solutions:

[0006] A multi-screw plastic extruder comprises a base, a single-screw barrel and a twin-screw barrel, wherein the outer walls of the single-screw barrel and the twin-screw barrel are both provided with heating barrels, the tail of the single-screw barrel is connected to the head of the twin-screw barrel, the head of the single-screw barrel is provided with a feed port, the tail of the twin-screw barrel is provided with an extrusion port, a first screw is provided in the single-screw barrel, two second screws are provided in the twin-screw barrel, and a driving assembly is provided on the single-screw barrel and the twin-screw barrel for driving the screws.

[0007] Further optimized, the length of the first screw is 80cm-100cm.

[0008] Further optimized, the feed port is opened on the side wall of the single screw barrel, and a feed hopper is fixed on the feed port.

[0009] Further optimized, the drive assembly is provided with two groups, each group includes a motor, a reducer and a bearing, and is arranged at one end of the single-screw barrel and the twin-screw barrel for driving the screw.

[0010] In a further optimized manner, the single-screw barrel and the twin-screw barrel are arranged perpendicular to each other, the twin-screw barrel is fixed on a base, and the single-screw barrel is fixed on a side wall at one end of the twin-screw barrel.

[0011] Further optimized, the single screw barrel is arranged in parallel with the twin screw barrel, the single screw barrel is fixed above the twin screw barrel, and a connecting pipe is provided at the tail of the single screw barrel, which is connected with the head of the twin screw barrel.

[0012] Further optimized, the drive assembly is provided with a group, which is fixed on the base on one side of the single-screw barrel and the twin-screw barrel. The drive assembly includes a motor, a reducer, a transmission gear and a bearing, and is used to drive three screws at the same time.

[0013] Preferably, the first screw and the second screw rotate in opposite directions.

[0014] The beneficial effects of the utility model are:

[0015] This device adds a single screw barrel in front of the twin screw barrel. The extrusion force of the single screw during feeding is greater, which can increase the feed amount of raw materials, make feeding faster, and also increase the types of feed, making the extruder more widely applicable. Under the action of the heating barrel, the single screw barrel preheats the raw materials, and then enters the twin screw barrel for sufficient heating, melting, mixing, and then extrusion, increasing the feed amount and discharging faster, while not affecting the plasticizing effect while increasing the output. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model.

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure in Example 2 of the present utility model.

[0018] In the figure: 1. base; 2. single screw barrel; 21. first screw; 3. twin screw barrel; 31. second screw; 4. heating barrel; 5. extrusion port; 6. motor; 7. reducer; 8. bearing; 91. feed hopper; 92. feed port; 10. transmission gear. DETAILED DESCRIPTION

[0019] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in combination with the accompanying drawings. In the description of the present invention, it should be noted that the terms "left", "right", "front", "back", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0020] Embodiment 1:

[0021] like Figure 1 As shown, the utility model provides a multi-screw plastic extruder, including a base 1, a single screw barrel 2 and a twin screw barrel 3, wherein the outer walls of the single screw barrel 2 and the twin screw barrel 3 are both provided with a heating barrel 4, which heats the screw barrel to melt and plasticize the raw materials.

[0022] The tail of the single screw barrel 2 is connected to the head of the twin screw barrel 3, the head of the single screw barrel 2 is provided with a feed port 92, the tail of the twin screw barrel is provided with an extrusion port 5, the single screw barrel 2 is provided with a first screw 21, the twin screw barrel 3 is provided with two second screws 31, the single screw barrel 2 and the twin screw barrel 3 are provided with a driving assembly for driving the screws, powdered or granular raw materials are added from the feed port 92, conveyed by extrusion through the first screw, and preheated and melted at the same time, and then sent into the twin screw barrel, and under the action of the second screw 31, they are fully heated, melted or mixed, and finally extruded.

[0023] As a preferred embodiment, the length of the first screw 21 is 80 cm-100 cm, which increases the feed amount while ensuring the preheating effect.

[0024] As a preferred embodiment, the feed port 92 is opened on the side wall of the single screw barrel, and a feed hopper 91 is fixed on the feed port to facilitate feeding.

[0025] As a preferred embodiment, the single screw barrel 2 and the twin screw barrel 3 are arranged perpendicular to each other, the twin screw barrel 3 is fixed on the base, the single screw barrel 2 is fixed on the side wall of one end of the twin screw barrel 3, and the drive assembly is provided with 2 groups, each group includes a motor 6, a reducer 7 and a bearing 8, which are respectively arranged at one end of the single screw barrel 2 and the twin screw barrel 3 for driving the screw for extrusion and feeding.

[0026] This device is equipped with a single screw barrel 2 in front of the twin screw barrel 3. The extrusion force of the single screw during feeding is greater, which can increase the feed amount of raw materials and make the feeding faster. It can also increase the types of feed materials, making the extruder more widely applicable. Under the action of the heating barrel, the single screw barrel preheats the raw materials, and then enters the twin screw barrel for sufficient heating, melting, mixing, and finally extrusion, ensuring the feed amount while discharging faster, which does not affect the plasticizing effect and increases the output.

[0027] Embodiment 2:

[0028] The utility model also provides another connection method between a single screw barrel and a twin screw barrel, such as Figure 2 As shown,

[0029] The single screw barrel 2 is arranged in parallel with the twin screw barrel 3 . The single screw barrel 2 is fixed above the twin screw barrel 3 . A connecting pipe 22 is provided at the tail of the single screw barrel 2 , which is connected with the head of the twin screw barrel 3 through the connecting pipe.

[0030] Furthermore, the drive assembly is provided with a group, fixed on the base 1 on one side of the single screw barrel 2 and the twin screw barrel 2, and the drive assembly includes a motor 6, a reducer 7, a transmission gear 10 and a bearing 8. The motor drives three screws simultaneously through the transmission gear and the auxiliary gear, wherein the first screw in the single screw barrel 2 and the second screw in the twin screw barrel 3 rotate in opposite directions. The single screw is fed, preheated, and then enters the twin screw barrel for sufficient heating and melting, and finally extruded.

[0031] The parts not described in detail in the present utility model are all known technologies to those skilled in the art. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present utility model and are not limiting. Although the present utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present utility model, which should be included in the scope of the claims of the present utility model.

Claims

1. A multi-screw plastic extruder, comprising a base, a single screw barrel and a twin screw barrel, characterized in that: A heating barrel is provided on the outer wall of the single-screw barrel and the twin-screw barrel, the tail of the single-screw barrel is connected to the head of the twin-screw barrel, the head of the single-screw barrel is provided with a feed port, the tail of the twin-screw barrel is provided with an extrusion port, a first screw is provided in the single-screw barrel, two second screws are provided in the twin-screw barrel, and a driving assembly is provided on the single-screw barrel and the twin-screw barrel for driving the screws.

2. The multi-screw plastic extruder according to claim 1, characterized in that: The length of the first screw is 80cm-100cm.

3. The multi-screw plastic extruder according to claim 2, characterized in that: The feed port is opened on the side wall of the single screw barrel, and a feed hopper is fixed on the feed port.

4. The multi-screw plastic extruder according to claim 3, characterized in that: The driving assembly is provided with two groups, each group includes a motor, a reducer and a bearing, and is arranged at one end of the single screw barrel and the twin screw barrel for driving the screw.

5. The multi-screw plastic extruder according to claim 4, characterized in that: The single screw barrel and the twin screw barrel are arranged perpendicular to each other, the twin screw barrel is fixed on a base, and the single screw barrel is fixed on a side wall at one end of the twin screw barrel.

6. The multi-screw plastic extruder according to claim 3, characterized in that: The single screw barrel is arranged in parallel with the twin screw barrel. The single screw barrel is fixed above the twin screw barrel. The tail of the single screw barrel is provided with a connecting pipe which is connected with the head of the twin screw barrel.

7. The multi-screw plastic extruder according to claim 6, characterized in that: The driving assembly is provided with one group, which is fixed on the base on one side of the single-screw barrel and the twin-screw barrel. The driving assembly includes a motor, a reducer, a transmission gear and a bearing, and is used to drive three screws at the same time.

8. The multi-screw plastic extruder according to claim 7, characterized in that: The first screw and the second screw rotate in opposite directions.

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