High-speed exhaust type screw

Abstract

The utility model provides a high-speed exhaust type screw. The high-speed exhaust type screw is sequentially provided with a first-order screw section, a mixing screw section and a second-order screw section along the length direction, the outer diameter of a rod body of the first-order screw section is arranged from large to small in the length direction, and a first main screw flight and a first auxiliary screw flight are arranged on the whole length of the rod body. The outer diameter of a rod body of the second-order screw section is arranged from small to large in the length direction, a second main screw edge is arranged on the whole length of the rod body, and a second auxiliary screw edge is arranged on the front half section of the rod body. The high-speed exhaust type screw is suitable for high-speed operation, heat generated by friction between the screw and raw materials is higher, the high-speed exhaust type screw is suitable for compressing and melting PC raw materials with the high temperature, the good energy-saving effect is achieved, the higher the length-diameter ratio is, the longer the plasticizing time is, raw material plasticizing is more uniform, and the plasticizing effect is better.

Description

Technical Field

[0001] This invention relates to the field of screw injection molding machinery technology, and in particular provides a high-speed venting screw suitable for processing PC raw materials. Background Technology

[0002] Screw injection molding machines convey, compact, melt, mix, and pressurize thermoplastic or thermosetting materials, and use plastic molds to make plastic products of various shapes.

[0003] Currently, in the processing of low-temperature raw materials such as PP and PE, the main short screw with a length-to-diameter ratio of 28:1-30:1 is generally used, with a processing temperature of 220℃. The processing temperature within 33:1 is 240-250℃, which will not over-plasticize and is not suitable for high-temperature PC raw materials.

[0004] Furthermore, the aforementioned short screws have low processing efficiency. Taking the 120-type low-speed screw as an example, the conventional design speed is around 60 revolutions per minute, and the processing capacity is 200-300 kilograms per hour. Utility Model Content

[0005] This utility model provides a high-speed exhaust screw, which consists of a first-stage screw section, a mixing screw section, and a second-stage screw section arranged sequentially along its length. The outer diameter of the first-stage screw section decreases along its length, and the entire length of the screw is provided with a first main screw thread and a first secondary screw thread. The outer diameter of the second-stage screw section increases along its length, the entire length of the screw is provided with a second main screw thread, and the front half of the screw is provided with a second secondary screw thread.

[0006] Furthermore, the first-order screw segment is provided with a first section, a second section and a third section in sequence along the length direction. The outer diameters of the first section and the third section are fixed values, and the outer diameter of the first section is larger than that of the third section. The outer diameter of the second section is gradually changed.

[0007] Furthermore, the pitch of the first main thread and the first auxiliary thread are fixed values ​​in the first and third sections respectively, and the pitch of the first section is greater than the pitch of the third section. The pitch of the first main thread and the second auxiliary thread is gradually set in the second section.

[0008] Furthermore, the second-order screw segment is provided with a fourth section, a fifth section and a sixth section in sequence along the length direction. The outer diameters of the fourth section and the sixth section are fixed values, and the outer diameter of the fourth section is smaller than that of the sixth section. The outer diameter of the fifth section is gradually changed.

[0009] Furthermore, the pitch of the second main thread is fixed in the fourth and sixth sections, with the pitch in the fourth section being greater than that in the sixth section, and the pitch of the second main thread is gradually set in the fifth section.

[0010] Furthermore, the second secondary screw thread is distributed along the entire length of the fourth section and the first half of the fifth section, and the pitch of the second main screw thread in the fourth section is consistent with the pitch of the second secondary screw thread.

[0011] Furthermore, the mixing screw section has a feeding spiral groove evenly distributed on the circumference of the side near the first-stage screw section and a discharging spiral groove evenly distributed on the circumference of the side near the second-stage screw section, and the feeding spiral groove and the discharging spiral groove are arranged alternately on the circumference.

[0012] Furthermore, the cross-sectional area of ​​the feed spiral groove near the first-order screw section is larger than the cross-sectional area away from the first-order screw section, and the cross-sectional area of ​​the discharge spiral groove near the second-order screw section is larger than the cross-sectional area away from the second-order screw section.

[0013] Furthermore, the first main screw ridge and the first secondary screw ridge are evenly distributed around the circumference of the rod body surface of the first-order screw segment; the second main screw ridge and the second secondary screw ridge are evenly distributed around the circumference of the rod body surface of the second-order screw segment.

[0014] Furthermore, the length-to-diameter ratio of the high-speed exhaust screw is 36:1.

[0015] The beneficial effects of the high-speed exhaust screw provided are as follows:

[0016] 1. Suitable for high-speed operation. When the speed reaches about 110 rpm, the heat generated by the friction between the screw and the raw material is higher, which is suitable for compressing PC raw materials with high melting temperature and is more energy-efficient;

[0017] 2. With an aspect ratio of 36:1, it has a larger production capacity and a processing temperature of 280℃. It delivers materials faster; the longer the screw, the longer the heating time, and the higher the rotation speed. The higher the aspect ratio, the longer the plasticizing time, the more uniform the plasticizing of the raw materials, and the better the plasticizing effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the provided high-speed exhaust screw;

[0020] Figure 2This is a schematic diagram of the planar structure of an embodiment of the provided high-venting screw;

[0021] Figure 3 This is a partial schematic diagram of a first-order screw segment;

[0022] Figure 4 yes Figure 3 A magnified view of a portion at point A;

[0023] Figure 5 This is a partial schematic diagram of a second-order screw section;

[0024] Figure 6 yes Figure 5 A magnified view of a portion at point C;

[0025] Figure 7 This is a schematic diagram of the surface of the mixing screw section after it has been unfolded along the circumference.

[0026] Explanation of reference numerals in the attached diagram:

[0027] 1-First-order screw section, 11-First section, 12-Second section, 13-Third section, 14-First main screw thread, 15-First secondary screw thread;

[0028] 2-Second-stage screw section, 21-Fourth section, 22-Fifth section, 23-Sixth section, 24-Second main screw thread, 25-Second secondary screw thread;

[0029] 3-Mixing screw section, 31-Feed spiral groove, 32-Discharge spiral groove. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 7 As shown, this utility model provides a high-speed exhaust screw, which has a first-stage screw section 1, a mixing screw section 3, and a second-stage screw section 2 arranged sequentially along its length. The outer diameter of the first-stage screw section 1 is arranged from large to small along its length, and the entire length of the screw body is provided with a first main screw ridge 14 and a first secondary screw ridge 15. The outer diameter of the second-stage screw section 2 is arranged from small to large along its length, and the entire length of the screw body is provided with a second main screw ridge 24, and the front half of the screw body is provided with a second secondary screw ridge.

[0032] This high-speed exhaust screw is suitable for high-speed operation. When the speed reaches about 110 rpm, the heat generated by the friction between the screw and the raw material is even higher. It is suitable for compressing PC raw materials with high melting temperature and is more energy-efficient.

[0033] The high-speed venting screw has a length-to-diameter ratio of 36:1, resulting in higher production capacity and a processing temperature of 280℃. It also allows for faster material conveying; the longer screw length allows for longer heating time and higher rotation speed; the higher the length-to-diameter ratio, the longer the plasticizing time, resulting in more uniform plasticization and better plasticizing effect.

[0034] like Figure 2 , Figure 3 and Figure 4 As shown, the first main screw ridge 14 and the first secondary screw ridge 15 are evenly distributed around the circumference of the rod body surface of the first-order screw segment 1; the second main screw ridge 24 and the second secondary screw ridge are evenly distributed around the circumference of the rod body surface of the second-order screw segment 2.

[0035] The first-order screw segment 1 is provided with a first segment 11, a second segment 12 and a third segment 13 along its length. The outer diameters of the rods in the first segment 11 and the third segment 13 are fixed values, and the outer diameter of the rods in the first segment 11 is larger than that in the third segment 13. The outer diameter of the rods in the second segment 12 is gradually changed.

[0036] The pitch of the first main screw 14 and the first secondary screw 15 is a fixed value in the first section 11 and the third section 13, respectively, and the pitch of the first section 11 is greater than the pitch of the third section 13. The pitch of the first main screw 14 and the second secondary screw 15 is gradually set in the second section 12.

[0037] like Figure 2 , Figure 5 and Figure 6 As shown, the second-order screw segment 2 is provided with a fourth segment 21, a fifth segment 22 and a sixth segment 23 along its length. The outer diameters of the rods in the fourth segment 21 and the sixth segment 23 are fixed values, and the outer diameter of the rod in the fourth segment 21 is smaller than that in the sixth segment 23. The outer diameter of the rod in the fifth segment 22 is gradually changed.

[0038] The pitch of the second main thread 24 is fixed in both the fourth segment 21 and the sixth segment 23, with the pitch in the fourth segment 21 being greater than that in the sixth segment 23. The pitch of the second main thread 24 gradually changes in the fifth segment 22. The second auxiliary thread is distributed along the entire length of the fourth segment 21 and the first half of the fifth segment 22, and the pitch of the second main thread in the fourth segment 21 is consistent with the pitch of the second auxiliary thread.

[0039] like Figure 7As shown, the mixing screw section 3 has feeding spiral grooves 31 evenly distributed around its circumference on the side near the first-stage screw section 1, and discharging spiral grooves 32 evenly distributed around its circumference on the side near the second-stage screw section 2. The feeding spiral grooves 31 and discharging spiral grooves 32 are arranged alternately around their circumferences. The cross-sectional area of ​​the feeding spiral groove 31 near the first-stage screw section 1 is larger than the cross-sectional area away from the first-stage screw section 1, and the cross-sectional area of ​​the discharging spiral groove 32 near the second-stage screw section 2 is larger than the cross-sectional area away from the second-stage screw section 2.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-speed exhaust screw, characterized in that: Along the length direction, a first-stage screw section (1), a mixing screw section (3), and a second-stage screw section (2) are arranged sequentially. The outer diameter of the first-order screw section (1) is set from large to small along the length direction, and the entire length of the screw is provided with a first main screw edge (14) and a first secondary screw edge (15). The outer diameter of the second-order screw section (2) is set from small to large along the length direction, and the entire length of the screw is provided with a second main screw edge (24), and the front half of the screw is provided with a second auxiliary screw edge.

2. The high-speed exhaust screw according to claim 1, characterized in that: The first-order screw segment (1) is provided with a first section (11), a second section (12) and a third section (13) in sequence along the length direction. The outer diameters of the rods of the first section (11) and the third section (13) are fixed values, and the outer diameter of the rods of the first section (11) is greater than that of the rods of the third section (13). The outer diameter of the rods of the second section (12) is gradually changed.

3. The high-speed exhaust screw according to claim 2, characterized in that: The pitch of the first main thread (14) and the first secondary thread (15) are fixed values ​​in the first section (11) and the third section (13), respectively, and the pitch of the first section (11) is greater than the pitch of the third section (13). The pitch of the first main thread (14) and the second secondary thread is gradually set in the second section (12).

4. The high-speed exhaust screw according to claim 1, characterized in that: The second-order screw segment (2) is provided with a fourth section (21), a fifth section (22) and a sixth section (23) in sequence along the length direction. The outer diameters of the rods of the fourth section (21) and the sixth section (23) are fixed values, and the outer diameter of the rod of the fourth section (21) is smaller than that of the rod of the sixth section (23). The outer diameter of the rod of the fifth section (22) is gradually changed.

5. The high-speed exhaust screw according to claim 4, characterized in that: The pitch of the second main thread (24) is a fixed value in the fourth section (21) and the sixth section (23), and the pitch of the fourth section (21) is greater than the pitch of the sixth section (23). The pitch of the second main thread (24) is gradually set in the fifth section (22).

6. The high-speed exhaust screw according to claim 4, characterized in that: The second secondary screw thread is distributed along the entire length of the fourth section (21) and the first half of the fifth section (22), and the second main screw pitch is located in the fourth section (21) with the pitch of the second secondary screw thread.

7. The high-speed exhaust screw according to claim 1, characterized in that: The mixing screw section (3) has a feeding spiral groove (31) evenly distributed on the circumference of the side near the first-stage screw section (1) and a discharging spiral groove (32) evenly distributed on the circumference of the side near the second-stage screw section (2). The feeding spiral groove (31) and the discharging spiral groove (32) are arranged alternately on the circumference.

8. The high-speed exhaust screw according to claim 7, characterized in that: The cross-sectional area of ​​the feed spiral groove (31) near the first-order screw section (1) is greater than the cross-sectional area away from the first-order screw section (1), and the cross-sectional area of ​​the discharge spiral groove (32) near the second-order screw section (2) is greater than the cross-sectional area away from the second-order screw section (2).

9. The high-speed exhaust screw according to claim 1, characterized in that: The first main screw ridge (14) and the first secondary screw ridge (15) are evenly distributed around the circumference of the rod body surface of the first-order screw section (1); the second main screw ridge (24) and the second secondary screw ridge are evenly distributed around the circumference of the rod body surface of the second-order screw section (2).

10. The high-speed exhaust screw according to claim 1, characterized in that: The length-to-diameter ratio of the high-speed exhaust screw is 36:1.

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