Feeding structure of multi-screw extruder and multi-screw extruder

Abstract

The feeding structure comprises a charging barrel, a driving part, a stirring shaft, a first stirring blade, a second stirring blade and a third stirring blade, the driving part is connected to the charging barrel, the stirring shaft is connected with the driving part and extends into the charging barrel, the first stirring blade is connected to the stirring shaft, the first stirring blade is adjacent to the inner wall of the charging barrel, and the second stirring blade is adjacent to the inner wall of the charging barrel. The shape of the first stirring blade in the height direction is matched with the shape of the inner wall of the charging barrel, the second stirring blade is transversely connected to the stirring shaft and arranged between the first stirring blade and the stirring shaft, and the third stirring blade is vertically arranged on the second stirring blade. Materials on the inner wall of the charging barrel are stirred through the first stirring blades, so that the problem that the stirring efficiency of a stirring mechanism on the materials on the wall of the charging barrel is low in an original structure is solved, meanwhile, the second stirring blades and the third stirring blades conduct stirring in the middle of the charging barrel, an all-directional stirring structure is formed in the charging barrel, and therefore the stirring efficiency and effect are improved.

Description

Technical Field

[0001] This utility model relates to the field of multi-screw extruder technology, and in particular to a feeding structure for a multi-screw extruder. Background Technology

[0002] A multi-screw extruder is a commonly used plastic extrusion equipment. It contains at least three extrusion screws. The working principle of a multi-screw extruder is as follows: plastic granules are added to the barrel, and a mixing mechanism thoroughly agitates the granules. The rotation of the screw assembly propels the plastic into the barrel, where a heating system simultaneously melts the plastic. Under the combined effects of screw rotation and barrel heating, the plastic gradually melts into a viscous molten material. Once formed, the molten material is pushed towards the discharge port by the rotation of the screw assembly. During this process, the agitation of the screw assembly ensures thorough mixing of the plastic, improving its uniformity and quality. Finally, the molten material is extruded through the discharge port to form the desired plastic product.

[0003] The Chinese Patent Database has published a patent titled "Multi-screw Extruder with Plastic Particle Collection Function," publication number CN221339478U, publication date: July 16, 2024. This multi-screw extruder with plastic particle collection function includes a mixing tank, a mixing device fixedly installed on the top of the mixing tank, an extrusion box fixedly installed on the bottom surface of the mixing tank, a filter collection assembly movably installed on the top surface of the extrusion box, an extrusion device fixedly installed on one side of the extrusion box, and the extrusion box includes a box body unit and a limiting and venting unit.

[0004] The shortcomings of the above technical solution are: the material will be subject to greater resistance due to friction at the inner wall of the mixing tank, thereby reducing the movement speed of the material. As can be seen from the shape of the stirring rod in the attached drawings of the instruction manual, the stirring ability of the stirring rod is weak near the cylinder wall, so the stirring efficiency of the material near the cylinder wall is also low. Utility Model Content

[0005] This application provides a feeding structure for a multi-screw extruder to address the technical problem of low mixing efficiency of the stirring rod near the barrel wall. This application also discloses a multi-screw extruder.

[0006] The first aspect of this application provides a feeding structure for a multi-screw extruder, including:

[0007] The barrel has a feed inlet at the upper end and a discharge outlet at the lower end, and the lower end of the barrel is connected to a multi-screw extruder.

[0008] A drive unit is connected to the material cylinder;

[0009] A stirring shaft is connected to the drive component and extends into the material cylinder;

[0010] A first stirring blade is connected to the stirring shaft. The first stirring blade is adjacent to the inner wall of the barrel. The shape of the first stirring blade in the height direction matches the shape of the inner wall of the barrel.

[0011] The second stirring blade is laterally connected to the stirring shaft and disposed between the first stirring blade and the stirring shaft;

[0012] The third stirring blade is vertically positioned above the second stirring blade.

[0013] The beneficial effects of the above embodiments are as follows: the first stirring blade stirs the material on the inner wall of the barrel, thereby solving the problem of low stirring efficiency of the stirring mechanism on the barrel wall in the original structure. At the same time, the second stirring blade and the third stirring blade stir in the middle of the barrel, forming an all-round stirring structure in the barrel, thereby improving the stirring efficiency and effect.

[0014] Based on the above embodiments, the embodiments of this application can be further improved as follows:

[0015] In one embodiment of this application: the edge of the first stirring blade has a shovel angle, and one side of the shovel angle has a guide surface extending toward the middle of the barrel. The guide surface is used to guide the material toward the stirring shaft. The beneficial effect of this step is that the shovel angle facilitates shoveling material from the inner wall of the barrel into the guide surface, which then guides the material toward the second and third stirring blades, thereby improving the stirring efficiency and effect.

[0016] In one embodiment of this application: the other side of the shovel angle has a thickened surface extending toward the inner wall of the barrel. The beneficial effect of this step is that the thickened surface increases the thickness of the edge of the first stirring blade, thereby improving the strength of the first stirring blade.

[0017] In one embodiment of this application, the third stirring blades on adjacent second stirring blades are staggered. The beneficial effect of this step is that it can increase the stirring density of the third stirring blades.

[0018] In one embodiment of this application, the system further includes a support sleeve connected to the material cylinder, with the lower end of the stirring shaft rotatably inserted into the support sleeve. The beneficial effect of this step is that the radial limiting effect of the support sleeve improves the stability of the stirring shaft's rotation, thus reducing the product's failure rate and extending its service life.

[0019] A second aspect of this application provides a multi-screw extruder, including the feeding structure of the multi-screw extruder. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the feeding structure of a multi-screw extruder;

[0022] Figure 2 This is a schematic diagram of the cross-section of the first stirring blade.

[0023] The components include: 1. Material cylinder; 101. Inlet; 102. Outlet; 2. Drive unit; 3. Stirring shaft; 4. First stirring blade; 401. Shovel angle; 402. Guide surface; 403. Thickened surface; 5. Second stirring blade; 6. Third stirring blade; 7. Support sleeve; 8. Valve. Detailed Implementation

[0024] In this application, unless otherwise expressly specified and limited, the terms used should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. If electrical or electronic equipment is involved, it can also refer to an electrical connection or a communication signal connection, etc. For those skilled in the art, the specific meaning of different terms in this utility model can be understood according to the specific circumstances, and the scope of the specific meaning should be limited to achieving the function of this application.

[0025] In the description of this application, it should be understood that the directional terms or positional relationships described are based on the orientation or positional relationships shown in the accompanying drawings, or based on the orientation or positional relationships in actual use, and are only for the purpose of facilitating the description of the contents of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Example 1

[0027] like Figure 1As shown, a feeding structure for a multi-screw extruder includes: a barrel 1, a drive unit 2, a stirring shaft 3, a first stirring blade 4, a second stirring blade 5, and a third stirring blade 6. The barrel 1 has a feed inlet 101 at its upper end and a discharge outlet 102 at its lower end. The lower end of the barrel 1 is connected to the outer shell of the multi-screw extruder. The drive unit 2 is connected to the barrel 1. The stirring shaft 3 is connected to the drive unit 2 and extends into the barrel 1. The first stirring blade 4 is connected to the stirring shaft 3 and is adjacent to the inner wall of the barrel 1. The shape of the first stirring blade 4 in the height direction matches the shape of the inner wall of the barrel 1. The second stirring blade 5 is connected to the stirring shaft 3 laterally and is disposed between the first stirring blade 4 and the stirring shaft 3. The third stirring blade 6 is disposed vertically above the second stirring blade 5.

[0028] Specifically, such as Figure 1 As shown, the upper end of the material cylinder 1 is a cylinder cover and the lower end is a cylinder body. The cylinder cover is connected to the cylinder body and has a feed inlet 101. The driving component 2 is a geared motor. The motor is mounted on the cylinder cover through a bracket. The motor output shaft is connected to a vertically arranged stirring shaft 3 through a coupling. The stirring shaft 3 is also rotatably mounted on the cylinder cover through a bearing.

[0029] Specifically, such as Figure 1 , 2 As shown, the upper and lower ends of the first stirring blade 4 are connected to the stirring shaft 3 via connecting rods. The edge of the first stirring blade 4 has a shovel angle 401, and one side of the shovel angle 401 has a guide surface 402 extending toward the middle of the material cylinder 1. The guide surface 402 is used to guide the material toward the stirring shaft 3. The guide surface 402 is a receiving surface (i.e., a surface used to push the material to move). The guide surface 402 is a concave arc surface. The tip structure of the shovel angle 401 has low resistance when inserted between the materials. The guide surface 402 guides the material, so that the material moves toward the stirring shaft 3. On the one hand, it can relieve some of the resistance of the material, and on the other hand, it can guide the edge material to the center position, thereby improving the stirring efficiency and effect.

[0030] Specifically, such as Figure 2 As shown, the other side of the scraping angle 401 has a thickened surface 403 extending toward the inner wall of the material cylinder 1. The thickened surface 403 increases the thickness at the scraping angle 401, thereby improving the structural strength of the scraping angle 401.

[0031] Specifically, such as Figure 1 As shown, the second stirring blade 5 is arranged radially along the stirring shaft 3, and the third stirring blade 6 is arranged in a direction parallel to the stirring shaft 3. The third stirring blades 6 on adjacent second stirring blades 5 are staggered, which can improve the stirring density of the third stirring blades 6, that is, improve the stirring efficiency.

[0032] Specifically, such as Figure 1As shown, the feeding structure also includes a support sleeve 7, which is connected to the material cylinder 1 via a support rod. The lower end of the stirring shaft 3 is rotatably inserted into the support sleeve 7. The support sleeve 7 provides radial limiting, which improves the stability of the rotation of the stirring shaft 3, reduces the eccentricity of the rotating shaft, and helps to reduce the product failure rate and improve the product service life.

[0033] Specifically, such as Figure 1 As shown, the discharge port 102 is connected to a valve 8, which is a discharge butterfly valve or a slide gate valve. The discharge status is controlled by the valve 8.

[0034] In use, the feeding structure of the multi-screw extruder pours material into the barrel 1 through the feed port 101. The drive unit 2 drives the stirring shaft 3 to rotate. The first stirring blade 4 stirs the material on the inner wall of the barrel 1, while the second stirring shaft 3 and the third stirring shaft 3 stir the material in the middle of the barrel 1. This structure of stirring the material in all directions in the barrel 1 improves the stirring efficiency.

[0035] Example 2

[0036] A multi-screw extruder includes the feeding structure of the multi-screw extruder disclosed in Example 1.

[0037] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A feeding structure for a multi-screw extruder, characterized in that, include: The barrel has a feed inlet at the upper end and a discharge outlet at the lower end, and the lower end of the barrel is connected to a multi-screw extruder. A drive unit is connected to the material cylinder; A stirring shaft is connected to the drive component and extends into the material cylinder; A first stirring blade is connected to the stirring shaft. The first stirring blade is adjacent to the inner wall of the barrel. The shape of the first stirring blade in the height direction matches the shape of the inner wall of the barrel. The second stirring blade is laterally connected to the stirring shaft and disposed between the first stirring blade and the stirring shaft; The third stirring blade is vertically positioned above the second stirring blade.

2. The feeding structure according to claim 1, characterized in that, The first stirring blade has a shovel angle at its edge, and one side of the shovel angle has a guide surface extending toward the middle of the material cylinder. The guide surface is used to guide the material toward the stirring shaft.

3. The feeding structure according to claim 2, characterized in that, The other side of the shovel angle has a thickened surface extending toward the inner wall of the barrel.

4. The feeding structure according to claim 1, characterized in that, The third stirring blades on adjacent second stirring blades are staggered.

5. The feeding structure according to claim 1, characterized in that, Also includes: A support sleeve is connected to the material cylinder, and the lower end of the stirring shaft is rotatably inserted into the support sleeve.

6. A multi-screw extruder, characterized in that, The feeding structure includes the multi-screw extruder as described in any one of claims 1-5.

Images