Efficient plastic extruder screw

Abstract

The utility model provides a high-efficiency plastic extruder screw, which solves the problem that the existing extruder screw cannot well mix mixed materials uniformly. A feeding groove and a discharging groove which are adjacently arranged are uniformly distributed in the circumferential direction of the first mixing section, and a shearing groove is formed between the feeding groove and the discharging groove; at least two groups of rhombic convex blocks are arranged in the circumferential direction of the second mixing section, and the front and back adjacent rhombic convex blocks are arranged in a staggered manner; the third mixing section is provided with at least two check rings arranged at intervals, flow channels are arranged in the circumferential direction of the check rings, and the front and back adjacent flow channels are arranged in a staggered mode. After plasticized melt enters the first mixing section, the melt is shunted by the feeding groove and sheared by the shearing groove, then flows out of the discharging groove, passes through the second mixing section and the rhombic convex blocks to crush, refine, shunt and mix non-plasticized tiny fragments, finally passes through the third mixing section, and is shunted and mixed for multiple times through a plurality of runners which are arranged in a staggered manner; and the uniformity of the melt is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to extrusion equipment technical field, concretely relates to a kind of high-efficiency plastic extruder screw. BACKGROUND

[0002] In the working process, raw materials and additives are added into the cylinder in proportion, and the mixture becomes molten polymer through the rotation of the screw in the cylinder and the heating of the cylinder. Then, the mixture is continuously extruded from the head at a certain pressure and speed by the rotation of the screw, becoming the required plastic parts. The existing extruder screw, such as the extrusion screw of the single-screw extruder disclosed in Chinese Patent No. CN204172317U, includes a feeding section, a compression section, a metering section, and a mixing section along the feeding direction. The mixing section of the screw is provided with 5-10 rows of bosses, which has a relatively simple structure, resulting in a general mixing effect and easy uneven mixing of molten raw materials and additives, which cannot guarantee the quality of injection-molded products. SUMMARY

[0003] To overcome the shortcomings of the background art, the utility model provides a high-efficiency plastic extruder screw, which solves the problem of uneven mixing of the mixture in the existing extruder screw.

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

[0005] A high-efficiency plastic extruder screw includes a rod body, which is provided with a feeding section and a plasticizing section along the feeding direction. The rod body further includes:

[0006] A first mixing section is arranged at the discharge end of the plasticizing section. The first mixing section is circumferentially provided with adjacent feeding grooves and discharge grooves. A shearing groove is arranged between the feeding grooves and the discharge grooves.

[0007] A second mixing section is arranged at the discharge end of the first mixing section. The second mixing section is circumferentially provided with at least two groups of diamond-shaped protrusions. The diamond-shaped protrusions adjacent in front and back are arranged in a staggered manner.

[0008] A third mixing section is arranged at the discharge end of the second mixing section. The third mixing section is provided with at least two spacer rings arranged in a spaced manner. The spacer rings are circumferentially provided with flow channels. The flow channels adjacent in front and back are arranged in a staggered manner.

[0009] The width of the feeding grooves, the distance between the circumferentially adjacent diamond-shaped protrusions, and the width of the flow channels gradually decrease along the feeding direction.

[0010] The screw flights of the plasticizing section include main screw flights and auxiliary screw flights. The height of the main screw flights is greater than the height of the auxiliary screw flights. The front and back ends of the auxiliary screw flights are connected with the main screw flights, respectively. The distance between the auxiliary screw flights and the adjacent main screw flights in front and back forms main screw grooves and auxiliary screw grooves, respectively.

[0011] The rod body is provided with a cooling channel along the axial direction.

[0012] The cooling channel comprises a first channel and a second channel, the diameter of the first channel is smaller than that of the second channel, the first channel is from the tail end of the rod body to the end of the plasticizing section, and the second channel is from the end of the plasticizing section to the end of the third mixing section.

[0013] The feeding end of the feeding section is provided with a spiral groove opposite to the turning direction of the screw flight of the feeding section.

[0014] The screw flight top surface of the feeding section and the plasticizing section is provided with a wear-resistant layer.

[0015] The beneficial effects of the utility model are:

[0016] The molten material after plasticizing enters the first mixing section, is divided by the feeding groove and is sheared by the shearing groove, and then flows out from the discharge groove, so that the molten material is mixed and the plasticizing quality is improved, and then passes through the second mixing section, the rhombic protrusions crush and refine the small pieces that are not well plasticized and divide and mix them, so that the uniformity of mixing is further improved, and finally passes through the third mixing section, and the molten material is divided and mixed multiple times through the multiple staggered flow channels, so that the uniformity of the molten material is effectively improved, and the quality of the product is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of the utility model.

[0018] Figure 2 is an enlarged schematic view of position A in the utility model. Figure 1

[0019] Figure 3 is an enlarged schematic view of position B in the utility model. Figure 1

[0020] Figure 4 is a cross-sectional schematic view of the screw rod of the utility model.

[0021] Figure 5 is a cross-sectional schematic view of position C in the utility model. Figure 1

[0022] The feeding section 1, the plasticizing section 2, the feeding groove 3, the discharge groove 4, the shearing groove 5, the rhombic protrusion 6, the retaining ring 7, the flow channel 8, the main screw flight 9, the auxiliary screw flight 10, the main screw groove 11, the auxiliary screw groove 12, the first channel 13, the second channel 14, the spiral groove 15, and the wear-resistant layer 16. DETAILED DESCRIPTION

[0023] The utility model will be further described in combination with the drawings and embodiments: ​​​

[0024] In the embodiment, as shown in Figure 1 , Figure 2 , a high-efficiency plastic extruder screw includes a rod body, the rod body is sequentially provided with a feeding section 1 and a plasticizing section 2 along a feeding direction, and further includes:

[0025] A first mixing section is arranged at the discharging end of the plasticizing section 2, the first mixing section is uniformly provided with adjacent feeding grooves 3 and discharging grooves 4, and a shearing groove 5 is arranged between the feeding grooves 3 and the discharging grooves 4.

[0026] A second mixing section is arranged at the discharging end of the first mixing section, at least two groups of diamond-shaped protrusions 6 are arranged on the circumference of the second mixing section, and the diamond-shaped protrusions 6 arranged in front of and behind each other are staggered.

[0027] A third mixing section is arranged at the discharging end of the second mixing section, the third mixing section is provided with at least two spacer rings 7 arranged in a spaced manner, flow channels 8 are arranged on the circumference of the spacer rings 7, and the flow channels 8 arranged in front of and behind each other are staggered.

[0028] After the molten material plasticized is fed into the first mixing section, the molten material is sheared through the shearing groove 5 and the shunt of the feeding grooves 3, and then flows out from the discharging grooves 4 to mix the molten material and improve the plasticizing quality, and then passes through the second mixing section, the diamond-shaped protrusions 6 crush and refine the small pieces of the molten material that have not been plasticized and shunt the molten material to further improve the uniformity of the mixing, and finally passes through the third mixing section, the molten material is shunted and mixed through the multiple staggered flow channels 8 to effectively improve the uniformity of the molten material and further improve the quality of the product.

[0029] In the embodiment, as shown in Figure 1 , Figure 2 , the width of the feeding grooves 3, the distance between the circumferentially adjacent diamond-shaped protrusions 6, and the width of the flow channels 8 gradually decrease along the feeding direction. When the molten material passes through the first mixing section, the second mixing section, and the third mixing section, the channel through which the molten material flows gradually decreases, which can better subdivide and mix the molten material and make the mixing of the molten material more uniform.

[0030] In the embodiment, as shown in Figure 1 , Figure 3 , the screw flight of the plasticizing section 2 includes a main screw flight 9 and a secondary screw flight 10, the height of the main screw flight 9 is greater than the height of the secondary screw flight 10, the front and back ends of the secondary screw flight 10 are respectively connected with the main screw flight 9, and the distance between the secondary screw flight 10 and the circumferentially adjacent main screw flight 9 respectively forms a main screw groove 11 and a secondary screw groove 12. After the molten material enters the plasticizing section 2, the molten material that has not been melted stays in the main screw groove 11, and the molten material that has been melted enters the secondary screw groove 12 and is conveyed forward to achieve complete plasticization of the molten material, and the plasticizing effect is good.

[0031] In the embodiment, as shown in Figure 4As shown in the figure, the rod body is provided with a cooling channel along the axial direction. Cooling water is fed into the cooling channel to cool the screw rod, preventing the carbonization or decomposition of part of the material caused by the excessively high temperature of the screw rod.

[0032] In the embodiment, as shown in the figure, Figure 4 The cooling channel includes a first channel 13 and a second channel 14, the diameter of the first channel 13 is smaller than that of the second channel 14, the first channel 13 is from the tail end of the rod body to the end of the plasticizing section 2, and the second channel 14 is from the end of the plasticizing section 2 to the end of the third mixing section. The small diameter of the first channel 13 ensures that the mixed material does not lose much heat during the conveying and plasticizing process; the large diameter of the second channel 14 prevents the carbonization of the molten material due to high temperature and facilitates the rapid cooling of the molten material during the extrusion process.

[0033] In the embodiment, as shown in the figure, Figure 1 The feeding end of the feeding section 1 is provided with a spiral groove 15 opposite to the turning direction of the screw flight of the feeding section 1. The reverse spiral groove 15 can prevent the raw material from moving in the opposite direction of the feeding direction, avoiding the pollution or damage to the power device driving the rotation of the screw rod.

[0034] In the embodiment, as shown in the figure, Figure 1 、 Figure 5 The top surface of the screw flight of the feeding section 1 and the plasticizing section 2 is provided with a wear-resistant layer 16. The wear-resistant layer 16 can be a nitriding layer, a ceramic coating or an alloy coating, which can reduce the wear of the screw flight and prolong the service life of the screw rod.

[0035] Obviously, the above embodiments of the utility model are only examples for illustrating the utility model, and are not a limitation on the embodiments of the utility model. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary or possible to exhaust all the embodiments. The obvious changes or variations derived from the essential spirit of the utility model still belong to the protection scope of the utility model.

Claims

1. A high-efficiency plastic extruder screw comprising a barrel, the barrel being sequentially provided with a feeding section (1) and a plasticizing section (2) along a feeding direction, characterized in that, Also include: The first mixing section is arranged at the discharge end of the plasticizing section (2), and the circumferential direction of the first mixing section is uniformly distributed with adjacent feeding grooves (3) and discharge grooves (4), and the shearing grooves (5) are arranged between the feeding grooves (3) and the discharge grooves (4); The second mixing section is arranged at the discharge end of the first mixing section, and at least two groups of diamond-shaped protrusions (6) are arranged in the circumferential direction of the second mixing section, and the diamond-shaped protrusions (6) are arranged in front of and behind each other. The third mixing section is arranged at the discharge end of the second mixing section, and the third mixing section is provided with at least two spaced apart retaining rings (7), and the circumferential direction of the retaining ring (7) is provided with a flow channel (8), and the front and rear adjacent flow channels (8) are arranged in front of and behind each other.

2. A high efficiency plastic extruder screw as claimed in claim 1 wherein: The width of the feeding groove (3), the distance between the circumferential adjacent diamond-shaped protrusions (6) and the width of the flow channel (8) are sequentially reduced along the feeding direction.

3. A high efficiency plastic extruder screw as claimed in claim 1 wherein: The spiral rib of the plasticizing section (2) includes a main spiral rib (9) and a secondary spiral rib (10), the height of the main spiral rib (9) is greater than the height of the secondary spiral rib (10), the front and rear ends of the secondary spiral rib (10) are connected with the main spiral rib (9), and the distance between the secondary spiral rib (10) and the front and rear adjacent main spiral rib (9) respectively forms a main spiral groove (11) and a secondary spiral groove (12).

4. A high efficiency plastic extruder screw as claimed in claim 1 wherein: The rod body is provided with a cooling channel along the axial direction.

5. A high efficiency plastic extruder screw as claimed in claim 4 wherein: The cooling channel includes a first channel (13) and a second channel (14) connected with each other, the diameter of the first channel (13) is smaller than the diameter of the second channel (14), the first channel (13) is from the tail end of the rod body to the end of the plasticizing section (2), and the second channel (14) is from the end of the plasticizing section (2) to the end of the third mixing section.

6. A high efficiency plastic extruder screw as claimed in claim 1 wherein: The feeding end of the feeding section (1) is provided with a spiral groove (15) opposite to the spiral groove of the feeding section (1).

7. A high efficiency plastic extruder screw as claimed in claim 1 wherein: The top surface of the spiral rib of the feeding section (1) and the plasticizing section (2) is provided with a wear-resistant layer (16).

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