Screw structure for composite modified reinforced material

Abstract

The utility model discloses a screw structure for a composite modified reinforced material, which comprises an outer barrel and a double-screw combination, the double-screw combination comprises two screw units, each screw unit comprises a threaded feeding part and a shearing kneading part, and the outer barrel is provided with a screw hole. Each screw unit sequentially comprises a first threaded feeding part, a first shearing and kneading part, a second threaded feeding part, a second shearing and kneading part, a third threaded feeding part, a third shearing and kneading part, a first reverse shearing and kneading part, a fourth threaded feeding part, a fourth shearing and kneading part and a fifth threaded feeding part in the direction from the feeding hole to the discharging hole of the outer barrel; the first shearing kneading part, the second shearing kneading part, the third shearing kneading part, the fifth shearing kneading part, the sixth threaded feeding part, the sixth shearing kneading part, the first reverse threaded feeding part and the seventh threaded feeding part. According to the utility model, the structural design is ingenious, the shearing force of the screw can be effectively improved through the reverse shearing force and the reverse spiral force when the composite modified reinforced material is plasticized, the particles are effectively compact during plasticization, and the mechanical property is obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of modified plastic processing, in particular to a screw structure for composite modified reinforcing materials. Background Technique

[0002] When the existing plastic materials are plasticized in the early stage, plastic pellets need to be fed into the screw for shearing and mixing processing to crush them and make the particles dense. However, for some composite modified reinforcing materials such as nylon PA glass fiber, due to the insufficient shearing force and crushing strength of its conventional screw combination structure, the compatibility between the glass fiber in the plastic raw material and other materials is poor, resulting in serious floating of fibers on the surface of the product, and low tensile strength and flexural strength. Its tensile strength is only 100MPa - 120MPa, and the flexural strength is only 170MPa - 180MPa, which cannot meet the high-strength use requirements.

[0003] Based on this, this case proposes a screw structure for composite modified reinforcing materials with a clever structural design, which can effectively improve the shearing force of the screw during the plasticization of composite modified reinforcing materials through reverse shearing force and reverse spiral force, effectively making the particles dense during plasticization and significantly improving the mechanical properties. Content of the Utility Model

[0004] The purpose of the utility model is to provide a screw structure for composite modified reinforcing materials to solve the problem that in the actual use of the existing screw structure for composite modified reinforcing materials, some water bodies will adhere to the surface of the modified plastic after processing, and during transportation, these water bodies will adhere to the surface of the transportation mechanism, forming water stains as the water dries, and it is difficult to clean the transportation mechanism later.

[0005] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0006] The utility model is a screw structure for composite modified reinforcing materials, including an outer cylinder and a twin-screw combination distributed along the axis of the outer cylinder and arranged inside the outer cylinder. The twin-screw combination includes two screw units arranged side by side and having the same structure. Each screw unit includes a plurality of threaded feeding parts and a plurality of shearing and kneading parts. The outer surface of the threaded feeding part is provided with spiral grooves, and the shearing and kneading part includes a plurality of kneading blocks coaxial and angularly distributed with each other; each screw unit sequentially includes a first threaded feeding part, a first shearing and kneading part, a second threaded feeding part, a second shearing and kneading part, a third threaded feeding part, a third shearing and kneading part, a first reverse shearing and kneading part, a fourth threaded feeding part, a fourth shearing and kneading part, a fifth threaded feeding part, a fifth shearing and kneading part, a sixth threaded feeding part, a sixth shearing and kneading part, a first reverse threaded feeding part, and a seventh threaded feeding part from the feeding port to the discharging port of the outer cylinder.

[0007] As a further improvement, the pitches of the spiral grooves of the first screw feeding part, the fourth screw feeding part and the seventh screw feeding part all gradually decrease in the direction from the feeding port to the discharging port of the outer cylinder.

[0008] As a further improvement, the first shearing and kneading part, the second shearing and kneading part and the third shearing and kneading part each include ten kneading blocks, and the angular interval between every two adjacent kneading blocks is 45°, and the ten kneading blocks all rotate clockwise or counterclockwise in sequence.

[0009] As a further improvement, the first reverse shearing and kneading part includes a plurality of kneading blocks, and the angular interval between every two adjacent kneading blocks is 45° and the rotation direction is opposite to that of the kneading blocks of the third shearing and kneading part.

[0010] As a further improvement, the fourth shearing and kneading part and the fifth shearing and kneading part each include fifteen kneading blocks, and every five kneading blocks form a group. The included angle between every two adjacent kneading blocks in each group gradually increases in the direction from the feeding port to the discharging port of the outer cylinder, and the fifteen kneading blocks all rotate clockwise or counterclockwise in sequence.

[0011] As a further improvement, the included angle between every two adjacent kneading blocks in the first group is 45°, the included angle between every two adjacent kneading blocks in the second group is 60°, and the included angle between every two adjacent kneading blocks in the third group is 90°.

[0012] As a further improvement, the length of the first reverse screw feeding part is 0.1 - 0.3 of the length of the sixth shearing and kneading part. The sixth shearing and kneading part includes ten kneading blocks, and every five kneading blocks form a group. The included angle between every two adjacent kneading blocks in each group gradually increases in the direction from the feeding port to the discharging port of the outer cylinder, and the ten kneading blocks all rotate clockwise or counterclockwise in sequence.

[0013] As a further improvement, the included angle between every two adjacent kneading blocks in the first group is 45°, and the included angle between every two adjacent kneading blocks in the second group is 90°.

[0014] As a further improvement, the lengths of the first screw feeding part and the seventh screw feeding part both account for 0.2 - 0.3 of the total length of the twin-screw combination.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] The overall structure of the utility model adopts a multi-segment screw feeding part and a multi-segment shearing and kneading part. On the one hand, the screw feeding part is used to ensure sufficient thrust during overall feeding. On the other hand, the shearing and kneading part effectively cuts the raw materials. More importantly, by setting a reverse shearing and kneading part in the middle position of the screw combination, the shearing force on the raw materials during the plasticization process is greatly enhanced. And the final sudden stop of feeding is achieved through the reverse screw feeding part at the tail end to extrude the sheared raw materials through the reverse force, making them more dense. Overall, the shearing force of the screw during the plasticization of the composite modified reinforced material can be effectively improved through the reverse shearing force and the reverse spiral force, effectively making the particles dense during plasticization and significantly improving the mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a screw structure for a composite modified reinforced material of the present utility model;

[0019] Figure 2 is a schematic structural diagram of a partial twin-screw combination showing the shearing and kneading part inside the outer cylinder of the present utility model.

[0020] In the drawings, the list of components represented by each reference numeral is as follows:

[0021] 10. Outer cylinder; 11. Feeding port; 12. Exhaust port; 20. Twin-screw combination; 30. Screw unit; 31. First screw feeding part; 32. First shearing and kneading part; 33. Second screw feeding part; 34. Second shearing and kneading part; 35. Third screw feeding part; 36. Third shearing and kneading part; 37. First reverse shearing and kneading part; 38. Fourth screw feeding part; 39. Fourth shearing and kneading part; 40. Fifth screw feeding part; 41. Fifth shearing and kneading part; 42. Sixth screw feeding part; 43. Sixth shearing and kneading part; 44. First reverse screw feeding part; 45. Seventh screw feeding part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the above-mentioned objects, features, and advantages of the present utility model more obvious and understandable, the following will make a detailed description of the specific embodiments of the present utility model with reference to the drawings.

[0023] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0024] To make the objectives, technical solutions, and advantages of the present utility model clearer, the embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] Please refer to Figure 1 and Figure 2 A screw structure for a composite modified reinforcing material, comprising an outer cylinder 10 and a twin-screw combination 20 distributed along the axis of the outer cylinder 10 and disposed inside the outer cylinder 10. The outer cylinder 10 is provided with a feed inlet 11, an exhaust port 12, a discharge port (not shown in the figure), etc. The twin-screw combination 20 includes two screw units 30 arranged side by side and having the same structure. Each screw unit 30 can rotate independently inside the outer cylinder 10 to cooperate with the other screw unit 30 for shearing and feeding. Each screw unit 30 includes a plurality of threaded feed portions and a plurality of shear kneading portions. The outer surface of the threaded feed portion is provided with spiral grooves. The shear kneading portion includes a plurality of kneading blocks coaxial and angularly distributed with each other. Each screw unit 30 sequentially includes a first threaded feed portion 31, a first shear kneading portion 32, a second threaded feed portion 33, a second shear kneading portion 34, a third threaded feed portion 35, a third shear kneading portion 36, a first reverse shear kneading portion 37, a fourth threaded feed portion 38, a fourth shear kneading portion 39, a fifth threaded feed portion 40, a fifth shear kneading portion 41, a sixth threaded feed portion 42, a sixth shear kneading portion 43, a first reverse threaded feed portion 44, and a seventh threaded feed portion 45 from the feed inlet 11 of the outer cylinder 10 to the discharge port.

[0026] The overall structure adopts multiple sections of threaded feed portions and multiple sections of shear kneading portions. On the one hand, the threaded feed portion is used to ensure sufficient thrust during overall feeding. On the other hand, the shear kneading portion effectively shears the raw materials. More importantly, a reverse shear kneading portion is provided at the middle position of the screw combination to greatly enhance the shearing force on the raw materials during the plasticization process, and a reverse threaded feed portion at the tail end is used to achieve a final sudden stop of feeding to extrude the sheared raw materials through the reverse force, making them more dense. Overall, the reverse shear force and reverse spiral force can be used to effectively increase the shearing strength of the screw during the plasticization of the composite modified reinforcing material, effectively making the particles dense during plasticization and significantly improving the mechanical properties.

[0027] Please refer to Figure 1 and Figure 2, the pitches of the spiral grooves of the first screw feeding part 31, the fourth screw feeding part 38, and the seventh screw feeding part 45 all gradually decrease in the direction from the feeding port 11 of the outer cylinder 10 to the discharging port. The gradually decreasing pitch can effectively and gradually increase the conveying force of the screw, facilitating the maintenance of sufficient conveying force throughout the feeding process.

[0028] Furthermore, the first shearing and kneading part 32, the second shearing and kneading part 34, and the third shearing and kneading part 36 each include ten kneading blocks. The angle between every two adjacent kneading blocks is spaced at 45°, and the ten kneading blocks all rotate clockwise or counterclockwise in sequence. Figure 2 In the situation shown in [reference], the angle between every two adjacent kneading blocks is 90°. The larger the angle between the two kneading blocks, the stronger the shearing force, but the particle size will become lower accordingly. Therefore, through the preliminary shearing and crushing of the first three shearing and kneading parts, the particles of the raw material reach the degree of preliminary processing, facilitating sufficient densification during subsequent fine crushing.

[0029] Even further, the first reverse shearing and kneading part 37 includes several kneading blocks, and the angle between every two adjacent kneading blocks is spaced at 45° and is opposite to the rotation direction of the kneading blocks of the third shearing and kneading part 36. By setting the first reverse shearing and kneading part 37 in the middle position to suddenly increase the shearing force on the glass fiber, the raw material is crushed to a higher degree, further improving the particle size and overall densification, and effectively improving the mechanical properties of the material.

[0030] Please refer to Figure 1 and Figure 2 , the fourth shearing and kneading part 39 and the fifth shearing and kneading part 41 each include fifteen kneading blocks. Every five kneading blocks form a group. The included angle between every two adjacent kneading blocks in each group gradually increases in the direction from the feeding port 11 of the outer cylinder 10 to the discharging port, and the fifteen kneading blocks all rotate clockwise or counterclockwise in sequence. By means of the two shearing and kneading parts located near the end to perform fine crushing on the raw material at the back end, making its particle size reach the finest and densest degree, and completing most of the crushing work.

[0031] Furthermore, the included angle between every two adjacent kneading blocks in the first group of the fourth shearing and kneading part 39 and the fifth shearing and kneading part 41 is 45°, the included angle between every two adjacent kneading blocks in the second group is 60°, and the included angle between every two adjacent kneading blocks in the third group is 90°. By means of the gradually increasing included angle to continuously increase the shearing force during the crushing process, ensuring that the particle size of the raw material is continuously reduced.

[0032] Please refer to Figure 1 and Figure 2, the length of the first reverse-thread feeding part 44 is 0.1 - 0.3 times the length of the sixth shearing and kneading part 43. The sixth shearing and kneading part 43 includes ten kneading blocks, with every five kneading blocks forming a group. In each group, the angle between every two adjacent kneading blocks gradually increases in the direction from the feeding port 11 of the outer cylinder 10 to the discharging port, and the ten kneading blocks all rotate clockwise or counterclockwise in sequence.

[0033] The raw materials that have completed the crushing work are subjected to a reverse sudden stop through the first reverse-thread feeding part 44 at the most end position, and the final extrusion and compaction of the raw materials to be output are carried out through the huge instantaneous reverse thrust generated. The control of its length does not need to be too large. Preferably, it accounts for 0.2 of the length of the sixth shearing and kneading part 43. In this way, it can not only ensure sufficient thrust but also will not cause blockage and other impacts on the output of the material.

[0034] Furthermore, in the sixth shearing and kneading part 43, the angle between every two adjacent kneading blocks in the first group is 45°, and the angle between every two adjacent kneading blocks in the second group is 90°. The raw materials are finally sheared and crushed through the suddenly increasing angle to complete the shearing work of the entire crushing process and ensure that the particle size of the raw materials is fine enough.

[0035] Please refer to Figure 1 , the lengths of the first thread feeding part 31 and the seventh thread feeding part 45 both account for 0.2 - 0.3 of the total length of the twin-screw combination 20. Preferably, their lengths account for 0.25 of the total length. By means of the sufficiently long feeding parts at the head end and the end, it is ensured that the travel during overall feeding and discharging is sufficient, so as to achieve a stable movement process during feeding and discharging and uniform material conveying.

[0036] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A screw structure for composite modified reinforced materials, characterized in that: The invention comprises an outer cylinder (10) and a twin screw assembly (20) distributed along the axis of the outer cylinder (10) and arranged in the outer cylinder (10), wherein the twin screw assembly (20) comprises two screw units (30) distributed side by side and having the same structure, each screw unit (30) comprises a plurality of screw feed parts and a plurality of shearing and kneading parts, the outer surface of the screw feed part is provided with a spiral groove, and the shearing and kneading part comprises a plurality of coaxial kneading blocks distributed at an angle to each other; each screw unit (30) is arranged in a direction from a feed port (11) of the outer cylinder (10) to a discharge port The invention sequentially comprises a first screw feed section (31), a first shear kneading section (32), a second screw feed section (33), a second shear kneading section (34), a third screw feed section (35), a third shear kneading section (36), a first reverse shear kneading section (37), a fourth screw feed section (38), a fourth shear kneading section (39), a fifth screw feed section (40), a fifth shear kneading section (41), a sixth screw feed section (42), a sixth shear kneading section (43), a first reverse screw feed section (44) and a seventh screw feed section (45).

2. The screw structure for composite modified reinforced material according to claim 1, characterized in that: The pitches of the spiral grooves of the first threaded feed portion (31), the fourth threaded feed portion (38) and the seventh threaded feed portion (45) gradually decrease in the direction from the feed port (11) of the outer cylinder (10) to the discharge port.

3. The screw structure for composite modified reinforced material according to claim 1, characterized in that: The first shearing and kneading section (32), the second shearing and kneading section (34) and the third shearing and kneading section (36) each include ten kneading blocks, each two adjacent kneading blocks are spaced 45 degrees apart and the ten kneading blocks rotate clockwise or counterclockwise in sequence.

4. The screw structure for composite modified reinforced material according to claim 3, characterized in that: The first reverse shearing and kneading section (37) comprises a plurality of kneading blocks, and the angular interval between each two adjacent kneading blocks is 45° and the rotation direction is opposite to that of the kneading blocks of the third shearing and kneading section (36).

5. The screw structure for composite modified reinforced material according to claim 1, characterized in that: The fourth shearing and kneading section (39) and the fifth shearing and kneading section (41) each include fifteen kneading blocks, with five kneading blocks forming a group. The angle between two adjacent kneading blocks in each group in the direction from the feed inlet (11) of the outer cylinder (10) to the discharge outlet gradually increases, and the fifteen kneading blocks rotate clockwise or counterclockwise in sequence.

6. The screw structure for composite modified reinforced material according to claim 5, characterized in that: The angle between each two adjacent kneading blocks of the first group is 45°, the angle between each two adjacent kneading blocks of the second group is 60°, and the angle between each two adjacent kneading blocks of the third group is 90°.

7. The screw structure for composite modified reinforced material according to claim 1, characterized in that: The length of the first reverse thread feed portion (44) is 0.1 to 0.3 of the length of the sixth shearing and kneading portion (43). The sixth shearing and kneading portion (43) comprises ten kneading blocks, and each group is formed of five kneading blocks. The angle between each two adjacent kneading blocks in each group in the direction from the feed port (11) of the outer cylinder (10) to the discharge port gradually increases, and the ten kneading blocks rotate clockwise or counterclockwise in sequence.

8. The screw structure for composite modified reinforced material according to claim 7, characterized in that: The angle between each two adjacent kneading blocks of the first group is 45°, and the angle between each two adjacent kneading blocks of the second group is 90°.

9. The screw structure for composite modified reinforced material according to claim 1, characterized in that: The lengths of the first thread feed portion (31) and the seventh thread feed portion (45) each account for 0.2 to 0.3 of the total length of the twin screw assembly (20).

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