A high-efficiency mixing extrusion screw

Abstract

The present invention discloses a high-efficiency mixing extrusion screw, which solves the problem that single-screw equipment is prone to uneven mixing during mixing. The characteristic is that at least one part of the screw ridge of the mixing section contacts the inner wall of the barrel. During the rotation of the screw, at least one part of the screw ridge of the mixing section contacts the inner wall of the barrel, and the raw materials at the bottom of the screw are flipped to the surface of the screw, so that the mixed material can move at various positions of the screw, ensuring that the mixed material can be mixed evenly in cold and hot conditions, thereby improving product quality.

Description

Technical Field

[0001] The invention relates to the technical field of extrusion equipment, and in particular to a high-efficiency mixing extrusion screw. Background Art

[0002] When the extrusion equipment is working, two or more raw materials are added into the barrel, and the mixture becomes a molten polymer through the rotation of the screw in the barrel and the heating of the barrel. Then the rotation of the screw drives the plastic forward, so that the raw materials are ejected from the nozzle at a very high pressure and speed, injected into the closed mold, and solidified into the desired molded product after pressure maintenance and cooling. Common extrusion equipment mostly uses a single-screw extruder, but when a single-screw extruder is used for mixed extrusion processing, because the screw ridges of the mixing section do not contact the inner wall of the barrel, when the screw rotates, the raw materials at the bottom of the screw ridges cannot flip to the surface of the screw. At the same time, cooling water is passed through the outer wall of the barrel to cool the mixture, which will cause the temperature of the mixture to decrease from the center of the screw to the inner wall of the barrel, and ultimately cause the molten polymer to not be completely and evenly mixed with various raw materials during the mixing process, resulting in poor mixing effect, which in turn affects the quality of the product. Summary of the invention

[0003] In order to solve the problem that single-screw equipment is prone to uneven mixing during mixing, the present invention provides a high-efficiency mixing extrusion screw.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A high-efficiency mixing extrusion screw comprises a feeding section and a mixing section, wherein at least one portion of the screw ridge of the mixing section contacts the inner wall of a barrel.

[0006] The screw ridges of the mixing section include No. 1 screw ridges, and adjacent No. 1 screw ridges are provided with an angle difference.

[0007] The angle difference between adjacent No. 1 screw edges is 180°.

[0008] The first screw ridge includes a first screw ridge, the first screw ridge is provided with a first protrusion which gradually approaches the inner wall of the barrel and contacts the inner wall of the barrel, and the first protrusion is crescent-shaped.

[0009] It also includes a second screw rib, wherein the second screw rib is provided with a second protrusion, and a gap is provided between the second protrusion and the inner wall of the barrel.

[0010] The first screw flight and the second screw flight are arranged symmetrically.

[0011] At least one section of No. 2 screw rib is provided between adjacent No. 1 screw ribs, and both ends of the No. 2 screw rib are in contact with the inner wall of the barrel.

[0012] The second screw flight includes a third screw flight and a fourth screw flight with an angle difference of 180°.

[0013] The arrangement order of the screw fins is the first screw fin, the second screw fin, the third screw fin, the fourth screw fin, the second screw fin, and the first screw fin.

[0014] It also includes a feeding section, and the mixing section is arranged in the feeding section.

[0015] The beneficial effects of the present invention are:

[0016] During the rotation of the screw, at least one position of the screw rib of the mixing section contacts the inner wall of the barrel, flipping the raw materials at the bottom of the screw to the surface of the screw for stirring, so that the mixed materials can move at various positions of the screw, ensuring that the mixed materials can be mixed evenly at hot and cold temperatures, thereby improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the No. 1 mixing section of this invention.

[0019] Figure 3 It is a cross-sectional schematic diagram of the first screw flight and the second screw flight of the present invention.

[0020] Figure 4 It is a schematic diagram of the cross-sectional arrangement of adjacent No. 1 screw edges of the present invention.

[0021] Figure 5 It is a schematic cross-sectional arrangement diagram of a section of No. 2 screw ribs arranged adjacent to No. 1 screw ribs of the present invention.

[0022] Mixing section 1, No. 1 screw fin 2, first screw fin 21, second screw fin 22, No. 1 raised portion 3, No. 2 raised portion 4, No. 2 screw fin 5, third screw fin 51, fourth screw fin 52, feeding section 6. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0024] In the embodiment, Figure 1 , Figure 2 , Figure 3 As shown, a high-efficiency mixing extrusion screw includes a feeding section 6 and a mixing section 1, wherein at least one portion of the screw ridge of the mixing section 1 contacts the inner wall of the barrel. During the rotation of the screw, at least one portion of the screw ridge of the mixing section contacts the inner wall of the barrel, and the raw materials at the bottom of the screw are turned over to the surface of the screw for stirring, so that the mixed materials can move at various positions of the screw, ensuring that the mixed materials can be evenly mixed in cold and hot conditions, thereby improving product quality.

[0025] In the embodiment, Figure 2 , Figure 4As shown, the screw ribs of the mixing section 1 include No. 1 screw ribs 2, and adjacent No. 1 screw ribs 2 are provided with an angle difference; the angle difference between adjacent No. 1 screw ribs 2 is 180°. When the screw ribs rotate, one group of No. 1 screw ribs 2 moves from top to bottom, and another adjacent group of No. 1 screw ribs 2 moves from bottom to top, so that the mixing effect of various raw materials is better.

[0026] In the embodiment, Figure 3 , Figure 4 As shown, the first screw rib 2 includes a first screw rib 21, and the first screw rib 21 is provided with a first protrusion 3 that gradually approaches the inner wall of the barrel and contacts the inner wall of the barrel, and the first protrusion 3 is crescent-shaped. The distance between the first protrusion 3 of the first screw rib 21 and the inner wall of the barrel gradually decreases, which can achieve better mixing, and at the same time, the resistance of the screw is small when it rotates.

[0027] In the embodiment, Figure 3 , Figure 4 As shown, it also includes a second screw fin 22, and the second screw fin 22 is provided with a second protrusion 4, and a gap is provided between the second protrusion 4 and the inner wall of the barrel; the first screw fin 21 and the second screw fin 22 are symmetrically arranged. The adjacent first screw fins 2 are arranged in the order of the first screw fin 21, the second screw fin 22, the second screw fin 22, and the first screw fin 21; the second screw fin 22 plays a transition role, and the mixed material stirred by the first screw fin 21 moves to the second screw fin 22, and the second protrusion 4 performs secondary mixing and stirring on the raw materials.

[0028] In the embodiment, Figure 2 , Figure 5 As shown, at least one section of No. 2 screw rib 5 is provided between adjacent No. 1 screw ribs 2, and both ends of the No. 2 screw rib 5 are in contact with the inner wall of the barrel; the No. 2 screw rib 5 includes a third screw rib 51 and a fourth screw rib 52 with an angle difference of 180°. The cross section of the No. 2 screw rib 5 is elliptical, and the No. 2 screw rib 5 mixes and stirs the raw materials near the inner wall of the barrel again to ensure uniform mixing.

[0029] In the embodiment, Figure 5 As shown, the arrangement order of the screw fins is the first screw fin 21, the second screw fin 22, the third screw fin 51, the fourth screw fin 52, the second screw fin 22, and the first screw fin 21. Multiple sections of the second screw fins 5 can be arranged between adjacent first screw fins 2, and each screw fin stirs the raw materials at various positions in the barrel multiple times, so that the mixed materials can be fully and evenly stirred.

[0030] In the embodiment, Figure 1 As shown, it also includes a feeding section 6, and the first mixing section 1 is arranged in the feeding section 6. The screw ridge of the feeding section 6 contacts the inner wall of the barrel, and the first screw ridge 2 and the second screw ridge 5 are both arranged between the two screw ridges of the feeding section 6, and the mixing is performed while feeding, thereby ensuring the working efficiency of the screw.

[0031] Obviously, the above embodiments of the present invention are merely examples for illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to exhaust all implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A high-efficiency mixing extrusion screw, comprising a feeding section (6) and a mixing section (1), characterized in that: At least one portion of the screw ridge of the mixing section (1) is in contact with the inner wall of the barrel; The screw ridges of the mixing section (1) include a first screw ridge (2), and adjacent first screw ridges (2) are provided with an angle difference; The first screw ridge (2) comprises a first screw ridge (21) and a second screw ridge (22), the first screw ridge (21) being provided with a first protrusion (3) gradually approaching the inner wall of the barrel and contacting the inner wall of the barrel, the first protrusion (3) being crescent-shaped, the second screw ridge (22) being provided with a second protrusion (4), a gap being provided between the second protrusion (4) and the inner wall of the barrel; At least one section of No. 2 screw ridge (5) is provided between adjacent No. 1 screw ridges (2), both ends of the No. 2 screw ridge (5) are in contact with the inner wall of the barrel, and the cross-section of the No. 2 screw ridge (5) is elliptical.

2. A high-efficiency mixing extrusion screw as claimed in claim 1, characterized in that: The angle difference between adjacent No. 1 screw edges (2) is 180°.

3. A high-efficiency mixing extrusion screw as claimed in claim 1, characterized in that: The first screw fin (21) and the second screw fin (22) are arranged symmetrically, and the adjacent No. 1 screw fins (2) are arranged in the order of first screw fin (21), second screw fin (22), second screw fin (22), and first screw fin (21).

4. A high-efficiency mixing extrusion screw as claimed in claim 1, characterized in that: The second screw flight (5) comprises a third screw flight (51) and a fourth screw flight (52) with an angle difference of 180°.

5. A high-efficiency mixing extrusion screw as claimed in claim 4, characterized in that: The screw flights are arranged in the following order: a first screw flight (21), a second screw flight (22), a third screw flight (51), a fourth screw flight (52), a second screw flight (22), and a first screw flight (21).

6. A high-efficiency mixing extrusion screw as claimed in claim 1, characterized in that: The mixing section (1) is arranged in the feeding section (6).

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