Three-step type double-screw extruder

Abstract

The utility model relates to the technical field of extruders, in particular to a three-step double-screw extruder which comprises a base, a first extruder, a second extruder and a third extruder are arranged on the base, a feeding hopper is arranged on the first extruder, and a discharging hopper is arranged on the second extruder. The output ends and the input ends of the first extruder, the second extruder and the third extruder are sequentially connected, and the output end of the third extruder is used for discharging processed materials; the first extruder, the second extruder and the third extruder are each provided with an extrusion pipe, each extrusion pipe comprises a plurality of heating pipes, the two ends of each heating pipe are each provided with a connecting plate, and the connecting plates are connected through connecting structures; the output ends and the input ends of the first extruder, the second extruder and the third extruder are sequentially connected, the original long extruder is divided into three modules for machining in sequence, and the requirement for space is lowered.

Description

Technical Field

[0001] This utility model relates to the field of extruder technology, and in particular to a three-stage twin-screw extruder. Background Technology

[0002] Twin-screw extruders were developed based on single-screw extruders. Due to their excellent feeding performance, mixing and plasticizing performance, venting performance, and extrusion stability, they have been widely used in the molding and processing of extruded products. They are usually composed of several parts, such as a transmission device, a feeding device, a barrel, and a screw. The functions of each component are similar to those of a single-screw extruder. Twin-screw extruders used for profile extrusion are usually closely meshed and rotate in opposite directions. Although a few use co-rotating twin-screw extruders, they generally operate at relatively low screw speeds, around 10 r / min. High-speed meshing co-rotating twin-screw extruders are used for compounding, venting, or as continuous chemical reactors. The maximum screw speed range of these extruders is 300-600 r / min. Non-meshing extruders are used for mixing, venting, and chemical reactions. Their conveying mechanism is very different from that of meshing extruders and is closer to that of single-screw extruders.

[0003] To prevent raw materials from clogging in the feed hopper, existing twin-screw extruders typically employ a stirring structure to mix the materials within the hopper. This prevents clogging while ensuring uniform distribution of the raw materials. For example, Chinese Patent Publication No. CN119238907A discloses a "twin-screw extruder for producing anti-solidification cable materials." In this extruder, a second pulley mechanism drives the connecting shaft and the first right-angle gear to rotate. This causes the second right-angle gear, which meshes with the shaft, to rotate, which in turn drives the stirring shaft to rotate inside the feed hopper. The stirring plates at both ends of the shaft mix the cable raw materials inside the feed hopper, ensuring uniform distribution of the raw materials during subsequent extrusion processing and maintaining stable quality.

[0004] In practical use, twin-screw extruders are generally quite long, which ensures that the extrusion work can be completed in one go and saves energy. However, due to their long length, they also have problems such as space limitations, inconvenient maintenance, and high maintenance costs. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing twin-screw extruders, such as long length, space limitations, inconvenient maintenance, and high maintenance costs, and to propose a three-stage twin-screw extruder.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design a three-stage twin-screw extruder, including a base, on which a first extruder, a second extruder and a third extruder are arranged. The first extruder is provided with a feed hopper for inputting the material to be processed. The output end of the first extruder is connected to the input end of the second extruder, and the output end of the second extruder is connected to the input end of the third extruder. The output end of the third extruder is used to discharge the processed material.

[0008] The first extruder, the second extruder, and the third extruder are all equipped with extrusion tubes. Each extrusion tube includes multiple heating tubes, and each heating tube has a connecting plate at both ends. The connecting plates are connected to each other through a connecting structure.

[0009] Furthermore, the connection structure includes a first fixing frame and a second fixing frame. A threaded post is fixedly provided on the first fixing frame, and the threaded post passes through the two connecting plates and is threadedly connected to the second fixing frame.

[0010] Furthermore, the second fixing frame has an insertion hole corresponding to the threaded post, and a nut that mates with the insertion hole is rotatably disposed inside the second fixing frame, and the threaded post is threadedly connected to the nut.

[0011] Furthermore, a connecting tube that is fixedly connected to the nut is rotatably provided on the second fixed frame. The inner diameter of the connecting tube is larger than the outer diameter of the threaded column, and a polygonal block is fixedly connected to one end of the connecting tube.

[0012] Furthermore, a connecting sleeve is provided between the first fixed frame and the second fixed frame, and a limiting groove is formed in the connecting sleeve. A limiting block corresponding to the limiting groove is fixedly provided on both the first fixed frame and the second fixed frame.

[0013] Furthermore, one of the connecting plates is provided with a guide tube, and the other connecting plate is provided with a slot corresponding to the guide tube, and a sealing ring is fixedly provided on each of the guide tubes.

[0014] The three-stage twin-screw extruder proposed in this utility model has the following advantages:

[0015] In this utility model, by setting up a first extruder, a second extruder, and a third extruder, and connecting the output end and input end of the first extruder, the original long extruder is divided into three modules for sequential processing, reducing the space requirements, facilitating maintenance, and saving maintenance costs.

[0016] Secondly, in this utility model, by splitting the extrusion tube into multiple heating tubes and connecting plates, and connecting them to each other through a connecting structure, an extrusion tube of appropriate length can be assembled according to requirements, thereby improving the scope of application. At the same time, it is also convenient to remove and replace the blocked part, thereby improving maintenance efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a three-stage twin-screw extruder proposed in this utility model;

[0018] Figure 2 This is a schematic diagram of the connecting plate of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the threaded column of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the guide tube of this utility model.

[0021] In the diagram: 1. Base; 2. First extruder; 3. Second extruder; 4. Third extruder; 5. Feed hopper; 6. Extrusion tube; 7. Heating tube; 71. Connecting plate; 72. Guide tube; 73. Sealing ring; 8. Connecting structure; 81. First fixing frame; 82. Second fixing frame; 83. Threaded column; 84. Nut; 85. Connecting tube; 86. Polygonal block; 87. Connecting sleeve; 88. Limiting block. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figure 1-4 A three-stage twin-screw extruder includes a base 1, on which a first extruder 2, a second extruder 3, and a third extruder 4 are mounted. The first extruder 2 is provided with a feed hopper 5 for inputting the material to be processed. The output end of the first extruder 2 is connected to the input end of the second extruder 3, and the output end of the second extruder 3 is connected to the input end of the third extruder 4. The output end of the third extruder 4 is used to discharge the processed material.

[0024] The first extruder 2, the second extruder 3, and the third extruder 4 are all equipped with extrusion tubes 6. The extrusion tube 6 includes multiple heating tubes 7. Both ends of the heating tubes 7 are equipped with connecting plates 71, and the connecting plates 71 are connected to each other through a connecting structure 8.

[0025] In this invention, the output end of the first extruder 2 is connected to the input end of the second extruder 3, and the output end of the second extruder 3 is connected to the input end of the third extruder 4. The originally long extruder is divided into three modules for sequential processing, which reduces the space requirements, facilitates maintenance, and saves maintenance costs. By splitting the extrusion tube 6 into multiple heating tubes 7 and connecting plates 71, and connecting them with each other through the connecting structure 8, extrusion tubes 6 of appropriate length can be assembled according to requirements, which improves the applicability range. At the same time, it is also convenient to remove and replace the blocked parts, which improves maintenance efficiency.

[0026] Furthermore, in this embodiment, the connecting structure 8 includes a first fixing frame 81 and a second fixing frame 82. A threaded post 83 is fixedly provided on the first fixing frame 81. The threaded post 83 passes through the two connecting plates 71 and is threadedly connected to the second fixing frame 82. The two connecting plates 71 are threadedly connected to clamp and fix the two connecting plates 71, which is more secure and the force is more even.

[0027] Furthermore, in this embodiment, the second fixing frame 82 is provided with an insertion hole corresponding to the threaded post 83, and a nut 84 that mates with the insertion hole is rotatably provided inside the second fixing frame 82. The threaded post 83 is threadedly connected to the nut 84. During installation, the threaded post on the first fixing frame 81 is passed through the connecting plate 71 and inserted into the insertion hole of the second fixing frame 82. The threaded post and the first fixing frame 81 are fixed by rotating the nut 84, so that the two connecting plates 71 and the heating tube 7 are connected to each other.

[0028] It should be noted that, in this embodiment, a connecting tube 85 is rotatably provided on the second fixed frame 82 and fixedly connected to the nut 84. The inner diameter of the connecting tube 85 is larger than the outer diameter of the threaded post 83. A polygonal block 86 is fixedly connected to one end of the connecting tube 85. By rotating the polygonal block 86, the connecting tube 85 is rotated, which in turn drives the nut 84 to rotate and thread it to the threaded post 83. During this process, the threaded post 83 can pass through the nut 84 and enter the connecting tube 85, preventing obstruction of the movement of the threaded post 83 and preventing the nut 84 from falling off.

[0029] Furthermore, in this embodiment, a connecting sleeve 87 is provided between the first fixed frame 81 and the second fixed frame 82. A limiting groove is provided in the connecting sleeve 87. A limiting block 88 corresponding to the limiting groove is fixedly provided on both the first fixed frame 81 and the second fixed frame 82. By setting the connecting sleeve 87 to limit the first fixed frame 81 and the second fixed frame 82, the first fixed frame 81 and the second fixed frame 82 are prevented from disintegrating and falling off when the first fixed frame 81 and the second fixed frame 82 are removed.

[0030] More specifically, in this embodiment, two connecting plates 71 are connected to each other. One connecting plate 71 is provided with a guide tube 72, and the other connecting plate 71 is provided with a slot corresponding to the guide tube 72. A sealing ring 73 is fixedly provided on each guide tube 72. By setting the guide tube 72 to be inserted into the slot for guidance, it is convenient to align the connecting plates 71 on the two heating tubes 7, and prevent the internal channels of the heating tubes 7 from being misaligned, which would cause the extruder to malfunction.

[0031] Working method: During operation, material is added into the feed hopper 5, and the material enters the first extruder 2 for processing and then is extruded. It enters the input end of the second extruder 3 from the output end of the first extruder 2, undergoes secondary processing through the second extruder 3, and then enters the third extruder 4 for further processing and extrusion. The three modules process the material sequentially to achieve full processing.

[0032] By splitting the extrusion tube 6 into multiple heating tubes 7 and connecting plates 71, and connecting them to each other through the connecting structure 8, extrusion tubes 6 of appropriate length can be assembled according to requirements. During assembly, the threaded post on the first fixing frame 81 passes through the connecting plate 71 and is inserted into the insertion hole of the second fixing frame 82. By rotating the polygonal block 86, the connecting tube 85 is rotated, which in turn drives the nut 84 to rotate and threadedly connect with the threaded post 83. During this process, the threaded post 83 can pass through the nut 84 and enter the connecting tube 85.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A three-stage twin-screw extruder, comprising a base (1), characterized in that, The base (1) is provided with a first extruder (2), a second extruder (3) and a third extruder (4). The first extruder (2) is provided with a feed hopper (5) for inputting the material to be processed. The output end of the first extruder (2) is connected to the input end of the second extruder (3), and the output end of the second extruder (3) is connected to the input end of the third extruder (4). The output end of the third extruder (4) is used to discharge the processed material. The first extruder (2), the second extruder (3) and the third extruder (4) are all equipped with extrusion tubes (6), the extrusion tubes (6) include multiple heating tubes (7), and both ends of the heating tubes (7) are equipped with connecting plates (71), the connecting plates (71) are connected to each other through a connecting structure (8).

2. The three-stage twin-screw extruder according to claim 1, characterized in that: The connection structure (8) includes a first fixed frame (81) and a second fixed frame (82). A threaded post (83) is fixedly provided on the first fixed frame (81). The threaded post (83) passes through the two connecting plates (71) and is threadedly connected to the second fixed frame (82).

3. A three-stage twin-screw extruder according to claim 2, characterized in that: The second fixing frame (82) has an insertion hole corresponding to the threaded post (83), and a nut (84) that cooperates with the insertion hole is rotatably provided inside the second fixing frame (82). The threaded post (83) and the nut (84) are threadedly connected.

4. A three-stage twin-screw extruder according to claim 3, characterized in that: The second fixed frame (82) is rotatably provided with a connecting tube (85) that is fixedly connected to the nut (84). The inner diameter of the connecting tube (85) is larger than the outer diameter of the threaded column (83). One end of the connecting tube (85) is fixedly connected to a polygonal block (86).

5. A three-stage twin-screw extruder according to claim 2, characterized in that: A connecting sleeve (87) is provided between the first fixed frame (81) and the second fixed frame (82). A limiting groove is provided in the connecting sleeve (87). A limiting block (88) corresponding to the limiting groove is fixedly provided on both the first fixed frame (81) and the second fixed frame (82).

6. A three-stage twin-screw extruder according to claim 1, characterized in that: One of the connecting plates (71) is provided with a guide tube (72), and the other connecting plate (71) is provided with a slot corresponding to the guide tube (72). A sealing ring (73) is fixedly provided on each of the guide tubes (72).

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