Special screw rod for sheet production
By designing a special screw for sheet production, the problems of low yield and insufficient material plasticization caused by the simple screw structure in the prior art are solved, and the effect of efficient plasticization and stable material conveying in high-speed production is achieved.
Patent Information
- Application Number
- CN202422198796.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The screw structure in existing plastic product production equipment is simple, resulting in low output during high-speed production and cannot meet customers' high-yield and high-speed needs.
A special screw for sheet production is designed, including a rod body extending from front to back and a main thread extending from front to back along the rod body. The rod body is divided into multiple functional sections, and different threads and groove structures are provided in each section to improve the plasticization effect and plasticization efficiency of the material.
During the high-speed production process, a higher amount of food and stable material transportation are ensured, the plasticization effect and extrusion output of the material are improved, and the quality problems caused by the rapid rise of the material temperature is avoided.
Smart Images
Figure CN222972731U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of plastic product production equipment, and particularly to a special screw for sheet production. Background Art
[0002] At present, the screw structures for producing sheets on the market are relatively simple, with low production output during the production process. During high-speed production, the original screw structures cannot ensure the feeding amount of the screw, and there is not enough time to fully plasticize the materials, thus unable to meet the high-output and high-speed requirements of customers. Summary of the Invention
[0003] In order to solve the above technical problems, the purpose of this application is to provide a special screw for sheet production.
[0004] To achieve the above purpose, this application adopts the following technical solution: A special screw for sheet production includes a rod body extending from front to back and a main thread spirally extending from front to back along the rod body. The rod body is divided into a feeding section, a separation section, a barrier section, a homogenization section, and a mixing section from front to back. The main thread is distributed in the feeding section, the separation section, and the homogenization section, and the outer diameter of the main thread remains unchanged from front to back. The homogenization section is further provided with a spirally extending secondary thread, and the main thread and the secondary thread are alternately arranged axially backward on the rod body; the bottom diameter of the feeding section is greater than the bottom diameters of the homogenization section and the mixing section, and the depth of the thread groove formed by the main thread in the homogenization section is greater than the depth of the thread groove formed by the main thread in the feeding section; a separation groove is formed on the main thread of the separation section, and the separation groove divides the main thread into a spirally extending main ridge and a secondary ridge, and the volume of the separation groove gradually increases from front to back; a plurality of feeding grooves and a plurality of discharging grooves are formed in the barrier section, and the feeding grooves and the discharging grooves spirally extend from front to back along the barrier section, and the feeding grooves and the discharging grooves are alternately distributed in the circumferential direction of the barrier section; mixing groups are arranged at intervals from front to back on the mixing section, and each mixing group has a plurality of mixing pins distributed in sequence in the circumferential direction of the mixing section, and each mixing pin extends radially outward from the mixing section.
[0005] In the above technical solution, further preferably, the lead of the main thread in the feeding section is less than the lead of the main thread in the homogenization section, and the lead of the secondary thread is the same as the lead of the main thread in the homogenization section.
[0006] In the above technical solution, further preferably, the outer diameter of the secondary thread is the same as the outer diameter of the main thread.
[0007] In the above technical solution, further preferably, the rear end face of the main ridge, the front end face of the secondary ridge, and the outer surface of the separation section define the separation groove, and the rear end face of the secondary ridge, the front end face of the main ridge, and the outer surface of the separation section define a material groove. The groove width of the separation groove gradually increases from front to back, the volume of the material groove gradually decreases from front to back, and the groove width of the material groove gradually decreases from front to back.
[0008] In the above technical solution, further preferably, the outer diameter of the main ridge is greater than the outer diameter of the secondary ridge.
[0009] In the above technical solution, further preferably, in the conveying direction of the material, there is a first barrier between each feed groove and the adjacent upstream discharge groove, and a second barrier between each feed groove and the adjacent downstream discharge groove. There is a height difference of 4 mm - 6 mm between the first barrier and the second barrier.
[0010] In the above technical solution, further preferably, the mixing pins are beveled square pins. Each mixing pin has a first end face and a second end face arranged opposite to each other in the front and back. The first end face is located on the front side of the second end face. The first end face extends obliquely backward with respect to the outer surface of the mixing section, and there is an included angle of 95° - 105° between the first end face and the outer surface of the mixing section; the second end face extends obliquely forward with respect to the outer surface of the mixing section, and there is an included angle of 95° - 105° between the second end face and the outer surface of the mixing section.
[0011] In the above technical solution, further preferably, each mixing pin also has a first side end face and a second side end face arranged opposite to each other. The first side end face connects one side edge of the first end face, one side edge of the second end face, and the outer surface of the mixing section. The second side end face connects the other side edge of the first end face, the other side edge of the second end face, and the outer surface of the mixing section. The connections of the first end face, the second end face, the first side end face, the second side end face with the outer surface of the mixing section are rounded.
[0012] The present application has the following beneficial effects compared with the prior art:
[0013] The feed screw groove of the present application is shallow and the discharge screw groove is deep, ensuring a high material intake during high-speed production and stably conveying the material forward. The designs of the separation section, the barrier section, and the homogenization section improve the plasticization effect and efficiency of the material, and avoid the material temperature rising too fast during the high-speed rotation of the special screw, which affects the material quality. The mixing section further plasticizes the material to improve the plasticization quality and avoid material accumulation and carbonization; while adapting to high-speed production, the present application improves the extrusion output and the quality of the extruded material. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 FIG. 1 is a schematic structural view of a special screw provided by an embodiment of the present application;
[0015] Figure 2 FIG. 2 Figure 1 is a schematic structural view of a separation section in FIG. 2;
[0016] Figure 3 FIG. 3 Figure 2 is a partially enlarged schematic view at A in FIG. 3;
[0017] Figure 4 FIG. 4 Figure 1 is a schematic structural view of a barrier section in FIG. 4;
[0018] Figure 5 FIG. 5 Figure 4 is a developed schematic view of the surface of the barrier section in FIG. 5;
[0019] Figure 6 FIG. 6 Figure 5 is a sectional view taken along line B-B in FIG. 6;
[0020] Figure 7 FIG. 7 Figure 1 is a schematic structural view of a mixing section in FIG. 7;
[0021] Figure 8 FIG. 8 Figure 7 is a partially enlarged schematic view at C in FIG. 8;
[0022] Figure 9 FIG. 9 Figure 7 is a sectional view taken along line D-D in FIG. 9.
[0023] Wherein: 100, special screw; 1, rod body; 11, feeding section; 12, separation section; 13, barrier section; 14, homogenizing section; 15, mixing section; 2, main thread; 21, main ridge; 22, secondary ridge; 23, separation groove; 24, material groove; 3, secondary thread; 4, feeding groove; 5, discharging groove; 6, first barrier; 7, second barrier; 8, mixing group; 81, mixing pin; 811, first end face; 812, second end face; 813, first side end face; 814, second side end face. DETAILED DESCRIPTION OF THE INVENTION
[0024] To describe in detail the technical content, structural features, achieved objectives and effects of the application, the technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shapes, structures and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment.
[0025] The embodiment of the present application provides a special screw for sheet production. The special screw is installed in the barrel of an extruder and rotates around its own axis to shear and mix the raw materials in the barrel, so as to produce a fully plasticized material that meets the production requirements.
[0026] As Figure 1 shown, the special screw 100 includes a rod body 1 extending from front to back and a main thread 2 spirally extending from front to back along the rod body 1. The rod body 1 is sequentially divided into a feeding section 11, a separation section 12, a barrier section 13, a homogenization section 14 and a mixing section 15 from front to back. The outer diameter D of the main thread 2 is uniformly distributed in the feeding section 11, the separation section 12 and the homogenization section 14. A secondary thread 3 spirally extending along the rod body 1 is also provided on the homogenization section 14. The main thread 2 and the secondary thread 3 are alternately arranged along the axial direction of the rod body 1 from front to back.
[0027] The bottom diameter d of the feeding section 11 is greater than the bottom diameters of the homogenization section 14 and the mixing section 15. Therefore, the depth of the screw groove formed by the main thread 2 in the feeding section 11 is less than the depth of the screw groove formed by the main thread 2 in the homogenization section 14. The lead S of the main thread 2 in the feeding section 11 is less than the leads of the main thread 2 in other segments. The feeding section 11 with a shallower screw groove depth and a smaller lead cooperates with the draw groove in the barrel to increase the friction between the material in the feeding section 11 and the barrel walls of the special screw 100 and the barrel, thereby increasing the feeding amount, conveying efficiency and conveying stability of the special screw 100.
[0028] As Figure 2 、 3As shown, a separation groove 23 is provided on the main thread 2 of the separation section 12. The separation groove 23 divides the main thread 2 into a main ridge 21 and a secondary ridge 22 that extend spirally. The volume of the separation groove 23 gradually increases from front to back. The rear end face of the main ridge 21, the front end face of the secondary ridge 22, and the outer surface of the separation section 12 define the separation groove 23. The rear end face of the secondary ridge 22, the front end face of the main ridge 21, and the outer surface of the separation section 12 define a material groove 24. The groove width of the separation groove 23 gradually increases from front to back. The volume of the material groove 24 gradually decreases from front to back. The groove width of the material groove 24 gradually decreases from front to back. The changes in the separation groove 23 and the material groove 24 conform to the solid-liquid changes of the material in the separation section 12, improving the solid-liquid conversion efficiency of the material. The outer diameter of the main ridge 21 is greater than that of the secondary ridge 22, and there is a height difference δ between the main ridge 21 and the secondary ridge 22 in the radial direction of the rod body 1, improving the plasticization effect and quality of the material in the separation section 12 and preventing the material from burning due to excessive temperature rise.
[0029] As Figures 4 - 6 shown, a plurality of feed grooves 4 and a plurality of discharge grooves 5 are provided in the barrier section 13. The feed grooves 4 and the discharge grooves 5 extend spirally from front to back along the barrier section 13, and the feed grooves 4 and the discharge grooves 5 are alternately distributed in the circumferential direction of the barrier section 13. In the conveying direction of the molten material, there is a first barrier 6 between each feed groove 4 and the adjacent upstream discharge groove 5, and a second barrier 7 between each feed groove 4 and the adjacent downstream discharge groove 5. There is a height difference θ of 4 mm - 6 mm between the first barrier 6 and the second barrier 7. When the molten material is input into the barrier section 13, it is divided into a plurality of feed grooves 4. When the special screw 100 rotates, the molten material passes through the gap between the second barrier 7 and the inner wall surface of the barrel under high pressure, so that it is subjected to intense shearing. The shearing area of the molten material increases, the mixing of the screw and the material is enhanced, and the time for the material to pass through here is shortened, reducing the risk of barrier overheating, and the plasticization and melting effect of the material is enhanced.
[0030] As Figure 1 shown, the lead of the secondary thread 3 of the homogenizing section 14 is the same as that of the main thread 2 of the homogenizing section 14, and the outer diameter of the secondary thread 3 is the same as that of the main thread 2. The main thread 2 and the secondary thread 3 form screw grooves with equal volumes in the homogenizing section 14 to stir and mix the material, slow down the pressure of the molten material output from the barrier section 13, and reduce the temperature rise. The material builds a stable extrusion pressure in the homogenizing section 14, improving the extrusion output.
[0031] As Figures 7 - 9As shown, mixing groups 8 are arranged on the mixing section 15 at intervals from front to back. Each mixing group 8 has a number of mixing pins 81 distributed in sequence around the circumference of the mixing section 15, and each mixing pin 81 extends radially outward from the mixing section 15. Each mixing pin 81 is an angled square pin, and each mixing pin 81 has a first end face 811 and a second end face 812 arranged opposite to each other in the front and back. The first end face 811 is located on the front side of the second end face 812. The first end face 811 extends obliquely backward relative to the outer surface of the mixing section 15, and there is an included angle α of 95° - 105° between the first end face 811 and the outer surface of the mixing section 15; the second end face 812 extends obliquely forward relative to the outer surface of the mixing section 15, and there is an included angle β of 95° - 105° between the second end face 812 and the outer surface of the mixing section 15. Each mixing pin 81 also has a first side end face 813 and a second side end face 814 arranged opposite to each other. The first side end face 813 connects one side edge of the first end face 811, one side edge of the second end face 812, and the outer surface of the mixing section 15. The second side end face 814 connects the other side edge of the first end face 811, the other side edge of the second end face 812, and the outer surface of the mixing section 15. The connection parts of the first end face 811, the second end face 812, the first side end face 813, the second side end face 814 and the outer surface of the mixing section 15 are rounded. The molten material is shunted and converged multiple times under the action of the multiple mixing pins 81 on the mixing section 15. The uncompletely molten solid-phase material is broken up multiple times here and fully mixed with the liquid-phase material. The solid-phase material absorbs heat from the liquid-phase material, thereby accelerating melting, making the overall quality of the melt uniform; at the same time, the design of the angled square pins of each mixing pin 81 avoids flow dead corners, improves the flow efficiency, and effectively prevents material accumulation and high-temperature carbonization here, which affects the product quality.
[0032] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements. The scope of protection required by the present application is defined by the appended claims, the specification and their equivalents.
Claims
1. A special screw for sheet production, characterized in that: The invention comprises a rod body extending from front to back and a main thread extending spirally from front to back along the rod body, wherein the rod body is divided into a feeding section, a separation section, a barrier section, a homogenizing section and a mixing section from front to back, wherein the main thread is distributed in the feeding section, the separation section and the homogenizing section, and the outer diameter of the main thread remains unchanged from front to back, and the homogenizing section is further provided with a spirally extending secondary thread, wherein the main thread and the secondary thread are alternately arranged from rear to front in the axial direction of the rod body; the bottom diameter of the feeding section is larger than the bottom diameter of the homogenizing section and the mixing section, and the depth of the screw groove formed by the main thread in the homogenizing section is larger than the depth of the screw groove formed by the main thread in the feeding section ; A separation groove is provided on the main thread of the separation section, and the separation groove separates the main thread into a main edge and a secondary edge that extend spirally, and the volume of the separation groove gradually increases from front to back; the barrier section is provided with a plurality of feed grooves and a plurality of discharge grooves, and the feed grooves and the discharge grooves extend spirally from front to back along the barrier section, and the feed grooves and the discharge grooves are alternately distributed along the circumferential direction of the barrier section; the mixing section is provided with mixing groups that are spaced from front to back, and each of the mixing groups has a plurality of mixing pins that are distributed in sequence around the circumference of the mixing section, and each of the mixing pins extends radially outward from the mixing section.
2. The special screw according to claim 1, characterized in that: The lead of the main thread in the feeding section is smaller than the lead of the main thread in the homogenizing section, and the lead of the secondary thread is consistent with the lead of the main thread in the homogenizing section.
3. The special screw according to claim 1, characterized in that: The outer diameter of the secondary thread is consistent with the outer diameter of the primary thread.
4. The special screw according to claim 1, characterized in that: The rear end face of the main edge, the front end face of the secondary edge and the outer surface of the separation section define the separation groove, the rear end face of the secondary edge, the front end face of the main edge and the outer surface of the separation section define a material trough, the groove width of the separation groove gradually increases from front to back, the volume of the material trough gradually decreases from front to back, and the groove width of the material trough gradually decreases from front to back.
5. The special screw according to claim 4, characterized in that: The outer diameter of the main edge is greater than the outer diameter of the secondary edge.
6. The special screw according to claim 1, characterized in that: In the material conveying direction, each of the feed troughs has a first barrier between it and the discharge trough adjacent to the upstream, and a second barrier between it and the discharge trough adjacent to the downstream, and there is a height difference of 4mm-6mm between the first barrier and the second barrier.
7. The special screw according to claim 1, characterized in that: The mixing pins are beveled square pins, and each of the mixing pins has a first end face and a second end face that are arranged opposite to each other front and back. The first end face is located in front of the second end face, and the first end face extends backward at an inclination relative to the outer surface of the mixing section, and an angle of 95°-105° is formed between the first end face and the outer surface of the mixing section; the second end face extends forward at an inclination relative to the outer surface of the mixing section, and an angle of 95°-105° is formed between the second end face and the outer surface of the mixing section.
8. The special screw according to claim 7, characterized in that: Each of the mixing pins also has a first side end face and a second side end face arranged opposite to each other, the first side end face connects one side edge of the first end face, one side edge of the second end face and the outer surface of the mixing section, the second side end face connects the other side edge of the first end face, the other side edge of the second end face and the outer surface of the mixing section, and the connections between the first end face, the second end face, the first side end face, the second side end face and the outer surface of the mixing section are chamfered.