Conical screw for extruder

Abstract

The utility model provides a conical screw for an extruder. The conical screw solves the problem that a traditional conical double screw is insufficient in mixing of materials. The mulling section is arranged between the compression section and the homogenization section; the first stirring columns are arranged at the front end of the mulling section, and the first stirring columns are uniformly distributed in the circumferential direction of the conical rod body; the vertical edges are arranged at the middle end of the mulling section and are uniformly distributed in the circumferential direction of the conical rod body; the second stirring columns are arranged at the tail end of the mulling section, and the second stirring columns are uniformly distributed in the circumferential direction of the conical rod body. A mixed material is melted through the compression section and then stirred and mixed through the first stirring column, then melt flows into the space between the vertical edges to be divided, the melt flows out of the space between the vertical edges to be mixed and then stirred through the second stirring column to be mixed again, the melt is repeatedly mixed through the mulling section, the structure components of a product are more uniform, and the product quality is improved. And the quality of the extruded product is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to a conical screw rod used for extruders. Background Art

[0002] The screw extruder relies on the pressure and shear force generated by the rotation of the screw to fully plasticize and evenly mix the materials and form them through the die. Plastic extruders are generally divided into twin-screw extruders and single-screw extruders. Compared with single-screw extruders, conical twin-screw extruders have the advantages of high production efficiency and high degree of process control automation. When working, the plastic extruder needs to add different stabilizers to improve the service life and appearance quality of plastic products. The existing conical twin-screw structure is simple, and the mixing of raw materials and stabilizers is not sufficient, which affects the quality and performance of the product. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the utility model provides a conical screw for an extruder, which solves the problem that the traditional conical twin-screw does not mix the materials sufficiently.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A conical screw for an extruder comprises a conical rod body, on which a feeding section, a compression section, a homogenizing section, an exhaust section and an extrusion section are sequentially arranged, and further comprises:

[0006] The mixing section is arranged between the compression section and the homogenization section;

[0007] A first stirring column is arranged at the front end of the mixing section, and the first stirring column is evenly distributed around the circumference of the tapered rod body;

[0008] Vertical edges are arranged at the middle end of the mixing section, and the vertical edges are evenly distributed in the circumference of the conical rod body;

[0009] The second stirring column is arranged at the end of the mixing section, and the second stirring column is evenly distributed around the circumference of the tapered rod body.

[0010] There are at least two groups of No. 1 stirring columns, and the front and rear adjacent No. 1 stirring columns are arranged in a staggered manner.

[0011] The front and rear ends of the vertical edges are both in the shape of isosceles triangles.

[0012] The screw ribs on the compression section are provided with reflux grooves.

[0013] The top surfaces of the screw ridges on the feeding section, the compression section, the homogenizing section, the exhaust section and the extrusion section are all provided with wear-resistant coatings.

[0014] A cooling channel is axially arranged in the conical rod body, and the cooling channel includes a first cooling channel and a second cooling channel. The diameter of the first cooling channel is larger than that of the second cooling channel, and the first cooling channel is arranged in the feed section.

[0015] A water inlet pipe is arranged in the cooling channel, the water inlet pipe is provided with a water outlet hole, the water inlet pipe is installed with a support ring for cooperating with the cooling channel, and the support ring is evenly distributed with through holes in the circumference.

[0016] The beneficial effects of the utility model are:

[0017] After the mixed material is melted in the compression section, it is stirred and mixed by the No. 1 stirring column, and then the melt flows into the gap between the vertical edges for diversion. When the melt flows out from between the vertical edges, it is mixed and then stirred by the No. 2 stirring column for mixing again. This mixing section allows the melt to be mixed repeatedly to make the product's structure and composition more uniform, ensuring the quality of the product after extrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the utility model.

[0019] Figure 2 This utility model Figure 1 A magnified schematic diagram of center A.

[0020] Figure 3 This utility model Figure 1 Schematic diagram of the cross section at point B.

[0021] Figure 4 It is a cross-sectional schematic diagram of the screw rib of the utility model.

[0022] Figure 5 It is a cross-sectional schematic diagram of the screw of the utility model.

[0023] Figure 6 It is a schematic diagram of the water inlet pipe in the No. 2 cooling channel of the utility model.

[0024] Figure 7 It is a cross-sectional schematic diagram of the support ring of the utility model.

[0025] Conical rod body 1, feeding section 2, compression section 3, homogenizing section 4, exhaust section 5, extrusion section 6, mixing section 7, stirring column No. 1 8, vertical ribs 9, stirring column No. 2 10, reflux groove 11, wear-resistant coating 12, cooling channel No. 1 13, cooling channel No. 2 14, water inlet pipe 15, water outlet hole 16, support ring 17, through hole 18. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0027] In the embodiment, Figure 1 , Figure 2 As shown, a conical screw for an extruder comprises a conical rod body 1, on which a feeding section 2, a compression section 3, a homogenizing section 4, a venting section 5 and an extrusion section 6 are sequentially arranged, and further comprises:

[0028] The mixing section 7 is arranged between the compression section 3 and the homogenization section 4;

[0029] A first stirring column 8 is arranged at the front end of the mixing section 7, and the first stirring column 8 is evenly distributed around the circumference of the conical rod body 1;

[0030] A vertical edge 9 is arranged at the middle end of the mixing section 7, and the vertical edges 9 are evenly distributed in the circumference of the conical rod body 1;

[0031] The second stirring column 10 is arranged at the end of the mixing section 7 , and the second stirring column 10 is evenly distributed around the circumference of the conical rod body 1 .

[0032] After the mixed material is melted in the compression section 3, it is stirred and mixed by the No. 1 stirring column 8, and then the melt flows into the gap between the vertical edges 9 for diversion. When the melt flows out from between the vertical edges 9, it is mixed and then stirred by the No. 2 stirring column 10 for mixing again. The mixing section 7 allows the melt to be mixed repeatedly to make the structural composition of the product more uniform, thereby ensuring the quality of the product after extrusion.

[0033] In the embodiment, Figure 1 , Figure 2 As shown, there are at least two groups of No. 1 stirring columns 8, and the front and rear adjacent No. 1 stirring columns 8 are arranged in a staggered manner. Of course, there are at least two groups of No. 2 stirring columns 10 that are arranged in a staggered manner. The No. 1 stirring column 8 and the No. 2 stirring column 10 fully stir the plasticized raw materials and stabilizer to further ensure the mixing effect of the raw materials and stabilizer.

[0034] In the embodiment, Figure 1 , Figure 2 As shown, the front and rear ends of the vertical edges 9 are both in the shape of isosceles triangles. The front and rear ends of the vertical edges 9 play a guiding role. When feeding, the molten material enters the spacing between adjacent vertical edges 9 along the inclined surface, and the molten material will not accumulate at the front end of the vertical edge 9; when discharging, the molten material flows out along the inclined surface for easy mixing.

[0035] In the embodiment, Figure 1 , Figure 3 As shown, the screw ribs on the compression section 3 are provided with a reflux groove 11. The reflux groove 11 is arranged in a spiral shape, and the melt can flow back from the front screw groove through the reflux groove 11 to the rear screw groove to mix with the melt in the rear screw groove, thereby improving the mixing efficiency of the melt.

[0036] In the embodiment, Figure 1 , Figure 4As shown, the top surfaces of the screw ridges on the feed section 2, compression section 3, homogenization section 4, exhaust section 5 and extrusion section 6 are all provided with a wear-resistant coating 12. The wear-resistant coating 12 can be a tungsten carbide alloy coating to improve the wear resistance of the screw ridges and ensure the service life of the screw.

[0037] In the embodiment, Figure 5 , Figure 6 As shown, a cooling channel is provided in the axial direction of the conical rod body 1, and the cooling channel includes a first cooling channel 13 and a second cooling channel 14. The diameter of the first cooling channel 13 is larger than that of the second cooling channel 14, and the first cooling channel 13 is provided in the feed section 2. This prevents the feed section 2 from being overheated, causing the raw material to melt prematurely, thereby causing deformation or burning of the product.

[0038] In the embodiment, Figure 5 , Figure 6 , Figure 7 As shown, a water inlet pipe 15 is provided in the cooling channel, the water inlet pipe is provided with a water outlet hole 16, the water inlet pipe 15 is installed with a support ring 17 for cooperating with the cooling channel, and the support ring 17 is evenly distributed with through holes 18 in the circumferential direction. The water inlet pipe 15 is concentrically arranged with the cooling channel to ensure that the circumferential temperature of the tapered rod body 1 is uniform, so that the molten material is evenly heated, and the quality of the product is ensured.

[0039] 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 ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to provide all the implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A conical screw for an extruder, comprising a conical rod body (1), wherein the conical rod body (1) is provided with a feeding section (2), a compression section (3), a homogenizing section (4), an exhaust section (5) and an extrusion section (6) in sequence, characterized in that: Also includes: A mixing section (7) is arranged between the compression section (3) and the homogenization section (4); A first stirring column (8) is arranged at the front end of the mixing section (7), and the first stirring column (8) is evenly distributed in the circumference of the conical rod body (1); Vertical ridges (9) are arranged at the middle end of the mixing section (7), and the vertical ridges (9) are evenly distributed in the circumference of the conical rod body (1); The second stirring column (10) is arranged at the end of the mixing section (7), and the second stirring column (10) is evenly distributed in the circumference of the conical rod body (1).

2. The conical screw for an extruder according to claim 1, characterized in that: There are at least two groups of No. 1 stirring columns (8), and the front and rear adjacent No. 1 stirring columns (8) are arranged in a staggered manner.

3. The conical screw for an extruder according to claim 1, characterized in that: The front and rear ends of the vertical edges (9) are both in the shape of isosceles triangles.

4. The conical screw for an extruder according to claim 1, characterized in that: The screw ribs on the compression section (3) are provided with reflux grooves (11).

5. The conical screw for an extruder according to claim 1, characterized in that: The top surfaces of the screw fins on the feed section (2), the compression section (3), the homogenization section (4), the exhaust section (5) and the extrusion section (6) are all provided with a wear-resistant coating (12).

6. The conical screw for an extruder according to claim 1, characterized in that: A cooling channel is axially arranged in the conical rod body (1), the cooling channel comprising a first cooling channel (13) and a second cooling channel (14), the first cooling channel (13) having a larger diameter than the second cooling channel (14), and the first cooling channel (13) being arranged in the feed section (2).

7. The conical screw for an extruder according to claim 6, characterized in that: A water inlet pipe (15) is provided in the cooling channel, the water inlet pipe is provided with a water outlet hole (16), the water inlet pipe (15) is installed with a support ring (17) for cooperating with the cooling channel, and the support ring (17) is evenly distributed with through holes (18) in the circumferential direction.

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