Exhaust type screw rod for sheet production
By designing an exhaust screw for sheet production, combining the structure and functions of first-order screws and second-order screws, the problems of low screw output, large energy consumption and high production costs in the prior art are solved, and a high-efficiency and low-energy consumption sheet production process is achieved.
Patent Information
- Application Number
- CN202422215792.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-10
AI Technical Summary
The existing single screws used for PP/PS/ABS sheet extrusion have low yield and high energy consumption, poor transparency of the extruded sheets, and additional drying processes are required during the production process, which are time-consuming and power-consuming, high production costs and complex processes.
An exhaust screw is adopted, including a first-order screw and a second-order screw. Through the feeding section, separation section, homogenization section and mixing section of the first-order screw, as well as the exhaust section, homogenization section and mixing section of the second-order screw, combined with the design of the thread and the arrangement of the separation tank, the efficient transportation, homogenization and exhaust of materials are achieved.
It improves the energy consumption ratio of the screw, reduces production costs, simplifies the process flow, and can directly extrude materials into molding, saving energy consumption and process.
Smart Images
Figure CN223030320U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of plastic product production equipment, and in particular to an exhaust screw for sheet production. Background Art
[0002] The current single screw used for PP / PS / ABS sheet extrusion has low output, high energy consumption, and poor transparency of the extruded sheet. During the production process of such sheets, an additional drying process needs to be added, and it can only be extruded and formed after crystallization drying, which is time-consuming, power-consuming, has high production costs, and a complex process. Summary of the Invention
[0003] In order to solve the above technical problems, the purpose of this application is to provide an exhaust screw for sheet production.
[0004] To achieve the above purpose, this application adopts the following technical scheme: An exhaust screw for sheet production includes a first-order screw and a second-order screw connected to the rear end of the first-order screw. The first-order screw includes a first rod body extending from front to back and a first thread spirally extending from front to back along the first rod body. The first rod body is successively an feeding section, a separation section, a first homogenization section, and a mixing section from front to back. The first thread is arranged with a constant outer diameter in the feeding section, the separation section, and the first homogenization section. Separation grooves spirally extending along the first rod body are formed on the first thread of the separation section, and the volume of the separation grooves gradually increases from front to back. A plurality of protruding pins are arranged on the mixing section at circumferentially spaced intervals along the first rod body; the second-order screw includes a second rod body extending from front to back, and a second thread and a third thread spirally extending from front to back along the second rod body. The second rod body is successively an exhaust section, a second homogenization section, and a kneading section from front to back. The second thread is arranged with a constant outer diameter in the exhaust section and the second homogenization section, the third thread is arranged with a constant outer diameter in the exhaust section, the second thread and the third thread are alternately distributed in the axial direction of the second rod body, and the bottom diameter of the exhaust section is smaller than that of other segments; the kneading section includes a plurality of kneading parts, and the plurality of kneading parts are successively distributed along a spiral direction from front to back; the length-diameter ratio of the exhaust screw is 42:1.
[0005] In the above technical scheme, further preferably, the feeding section is successively a first feeding sub-section and a second feeding sub-section from front to back, and the lead of the first thread in the first feeding sub-section is smaller than the lead of the first thread in the second feeding sub-section.
[0006] In the above technical scheme, further preferably, the lead of the first thread in the first homogenization section is equal to the lead of the first thread in the first feeding sub-section.
[0007] In the above technical solution, further preferably, the lead of the second thread in the second homogenization section is greater than the lead of the first thread in the first homogenization section.
[0008] In the above technical solution, further preferably, the separation groove divides the first thread into a main ridge and a secondary ridge that extend spirally. The rear end face of the main ridge, the front end face of the secondary ridge, and the surface of the first rod body define the separation groove. The rear end face of the secondary ridge, the front end face of the main ridge, and the surface of the first rod body define a solid phase groove, and the volume of the solid phase groove gradually decreases from front to back.
[0009] In the above technical solution, further preferably, the depth of the separation groove gradually increases from front to back, and the depth of the solid phase groove gradually decreases from front to back.
[0010] In the above technical solution, further preferably, the lead of the main ridge is uniform from front to back. The secondary ridge is successively divided into a first segment, a second segment, and a third segment from front to back. The lead of the first segment is greater than the lead of the second segment, and the lead of the third segment is greater than the lead of the second segment.
[0011] In the above technical solution, further preferably, the lead of the third thread in the exhaust section is the same as the lead of the second thread in the exhaust section.
[0012] The present application has the following beneficial effects compared with the prior art:
[0013] The exhaust screw of the present application is divided into a first-order screw and a second-order screw according to the screw function, which improves the energy consumption ratio, reduces the production cost, dries and exhausts the material during the extrusion process, can directly extrude the material into a molded product, saves energy, labor, and processes, and the process is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a schematic structural diagram of an exhaust screw provided by an embodiment of the present application;
[0015] Figure 2 is Figure 1 the developed view of the first thread of the first-order screw in
[0016] Figure 3 is Figure 2 the cross-sectional view taken along the line A-A in
[0017] Figure 4 is Figure 1 the schematic structural diagram of the mixing section in
[0018] Figure 5 A sectional view taken along line B-B in Figure 4 ;
[0019] Figure 6 is Figure 1 a developed view of the second and third threads of the second-order screw in
[0020] Figure 7 is Figure 1 a schematic structural view of the kneading section in
[0021] Wherein: 100, an exhaust screw; 10, a first-order screw; 1, a first rod body; 11, a feeding section; 111, a first feeding sub-section; 112, a second feeding sub-section; 12, a separation section; 13, a first homogenization section; 14, a mixing section; 2, a first thread; 21, a separation groove; 22, a solid-phase groove; 23, a main edge; 24, a secondary edge; 241, a first sub-section; 242, a second sub-section; 243, a third sub-section; 6, a protruding pin; 20, a second-order screw; 3, a second rod body; 31, an exhaust section; 32, a second homogenization section; 33, a kneading section; 4, a second thread; 5, a third thread; 7, a kneading part. Detailed Description of the Invention
[0022] 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 with reference to 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 of 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 can also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments can be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shapes, structures and characteristics of an exemplary embodiment can be used or implemented in another exemplary embodiment.
[0023] The embodiment of the present application provides an exhaust screw for sheet production. As Figure 1 shown, the exhaust screw 100 includes a first-order screw 10 and a second-order screw 20 connected to the rear end of the first-order screw 10. The first-order screw 10 includes a first rod body 1 extending from front to back and a first thread 2 spirally extending from front to back along the first rod body 1. The second-order screw 20 includes a second rod body 3 extending from front to back and a second thread 4 and a third thread 5 spirally extending from front to back along the second rod body 3. To meet the requirements of high output and exhaust function, the exhaust screw 100 needs to have a sufficient length, and the length-diameter ratio of the exhaust screw 100 is 42:1.
[0024] AsFigure 1 , 2 As shown, the first rod body 1 is successively the feeding section 11, the separation section 12, the first homogenization section 13 and the mixing section 14 from front to back. The first thread 2 is arranged with a constant outer diameter on the feeding section 11, the separation section 12 and the first homogenization section 13. The feeding section 11 is successively the first feeding sub-section 111 and the second feeding sub-section 112 from front to back. The lead S 11 of the first thread 2 in the first feeding sub-section 111 is 12 less than the lead S of the first thread 2 in the second feeding sub-section 112. The small lead of the first feeding sub-section 111 is conducive to feeding, and the large lead of the second feeding sub-section 112 is conducive to the forward conveying of materials. While greatly improving the conveying efficiency, it will not excessively increase the load of the extruder, and can meet the demand for the linear growth of the output of this screw at high speeds.
[0025] On the first thread 2 of the separation section 12, a separation groove 21 extending spirally along the first rod body 1 is provided. The volume of the separation groove 21 gradually increases from front to back. The separation groove 21 divides the first thread 2 into a main ridge 23 and a secondary ridge 24 extending spirally. The rear end face of the main ridge 23, the front end face of the secondary ridge 24 and the surface of the first rod body 1 define the separation groove 21. The rear end face of the secondary ridge 24, the front end face of the main ridge 23 and the surface of the first rod body 1 define a solid-phase groove 22. The volume of the solid-phase groove 22 gradually decreases from front to back. During the process of the first thread 2 conveying the material from front to back, the material is sheared by the first thread 2 and is plastified and melted from solid to melt. The volume of the separation groove 21 increases to separate, accommodate and convey the gradually increasing melt of the material, and the fixed groove 22 with a gradually decreasing volume accommodates and conveys the gradually decreasing solid material. The volume changes of the separation groove 21 and the solid-phase groove 22 conform to the changes during the plasticization process of the material, separating materials in different states to improve the plasticization efficiency and effect.
[0026] As Figure 2 , 3 shown, the groove depth of the separation groove 21 gradually increases from front to back, and the groove depth of the solid-phase groove 22 gradually decreases from front to back. The main ridge 23 and the secondary ridge 24 have a height difference δ in the radial direction of the first rod body 1. The height difference δ allows the molten material to cross over the secondary ridge 24 to achieve solid-liquid separation. The lead S2 of the main ridge 23 is equal from front to back, and the lead S2 of the main ridge 23 is greater than the lead of the first thread 2 in the feeding section 11. The secondary ridge 24 is successively divided into a first sub-section 241, a second sub-section 242 and a third sub-section 243 from front to back. The lead S 21 of the first sub-section 241 is 22 greater than the lead S of the second sub-section 242, 22The lead S2 of the second segment 242 is smaller than the lead of the main ridge 23, and the separation groove 21 formed by the second segment 242 and the main ridge 23 improves the solid-liquid conversion efficiency; the lead S of the third segment 243 23 is greater than the lead S of the second segment 242 22 , and the separation groove 21 formed by the third segment 243 and the main ridge 23 releases the pressure of the molten material and reduces the temperature rise of the molten material. The lead of the secondary ridge 24 adopts three-stage variable pitch according to the melting change requirements of the material, improves the solid-liquid conversion efficiency, meets the melting and plasticizing requirements during large production, and can also appropriately reduce the extrusion temperature rise.
[0027] As Figure 1 , 2 shown, the lead S3 of the first thread 2 in the first homogenization section 13 is equal to the lead S of the first thread 2 in the first feeding segment 111, and the material stably conveys pressure in the first homogenization section 13. 11
[0028] As Figure 4 , 5 shown, a plurality of protruding pins 6 are arranged on the mixing section 14 at intervals in the circumferential direction of the first rod body 1. The plurality of protruding pins 6 can disperse the molten material, which helps to improve the exhaust effect of the second-order screw 20.
[0029] As Figure 1 , 6 shown, the second rod body 3 is successively an exhaust section 31, a second homogenization section 32, and a kneading section 33 from front to back. The outer diameter of the second thread 4 is arranged unchanged on the exhaust section 31 and the second homogenization section 32, and the outer diameter of the third thread 5 is arranged unchanged on the exhaust section 31. The second thread 4 and the third thread 5 are alternately distributed in the axial direction of the second rod body 3, and the outer diameters of the first thread 2, the second thread 4, and the third thread 5 are equal. The bottom diameter of the exhaust section 31 is smaller than that of other segments. The lead S of the third thread 5 in the exhaust section 31 42 is consistent with the lead S of the second thread 4 in the exhaust section 31 41 , and the volume of the thread groove formed by the second thread 4 and the third thread 5 in the exhaust section 31 remains unchanged from front to back. The deeper and denser thread grooves in the exhaust section 31 are conducive to the release of gas and water vapor in the material, avoiding the extrusion of the material with air and water vapor, saving the work of drying the material, and improving the quality of the material.
[0030] The lead S5 of the second thread 4 in the second homogenization section 32 is greater than the lead S3 of the first thread 2 in the first homogenization section 13. A large lead is used for conveying in the second homogenization section 32, which can balance the output of the two-stage screw while increasing the conveying capacity and avoid material leakage from the exhaust port of the barrel corresponding to the exhaust section 31.
[0031] As Figure 7 As shown, the kneading section 33 includes a plurality of kneading parts 7, and the plurality of kneading parts 7 are sequentially distributed along a spiral direction from front to back; the kneading section 33 at the tail of the second-order screw 20 continuously disperses and mixes the molten material to improve the melting quality of the extruded material.
[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, and the above embodiments and the descriptions in the specification only illustrate 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 venting screw for sheet production, characterized in that: The invention comprises a first-stage screw and a second-stage screw connected to the rear end of the first-stage screw, wherein the first-stage screw comprises a first rod body extending from front to back and a first thread extending spirally from front to back along the first rod body, wherein the first rod body is sequentially divided into a feeding section, a separation section, a first homogenizing section and a mixing section from front to back, wherein the first thread is arranged in the feeding section, the separation section and the first homogenizing section with a constant outer diameter, wherein a separation groove extending spirally along the first rod body is provided on the first thread of the separation section, wherein the volume of the separation groove gradually increases from front to back, and wherein a plurality of protruding pins spaced apart along the circumference of the first rod body are arranged on the mixing section; the second-stage screw comprises a first rod body extending from front to back and a first thread extending spirally along the first rod body from front to back, wherein the first thread is arranged in the feeding section, the separation section and the first homogenizing section with a constant outer diameter, wherein the first thread of the separation section is provided with a separation groove extending spirally along the first rod body, wherein the volume of the separation groove gradually increases from front to back, and wherein the mixing section is provided with a plurality of protruding pins spaced apart along the circumference of the first rod body; A second rod body extending from front to back and a second thread and a third thread extending spirally from front to back along the second rod body, the second rod body is composed of an exhaust section, a second homogenizing section and a mixing section from front to back, the second thread is arranged in the exhaust section and the second homogenizing section with an unchanged outer diameter, the third thread is arranged in the exhaust section with an unchanged outer diameter, the second thread and the third thread are alternately distributed in the axial direction of the second rod body, the bottom diameter of the exhaust section is smaller than the bottom diameters of other sections; the mixing section includes a plurality of mixing parts, and the plurality of mixing parts are distributed in sequence along a spiral direction from front to back; the aspect ratio of the exhaust screw is 42:
1.
2. The venting screw according to claim 1, characterized in that: The feed section is divided into a first feed section and a second feed section from front to back, and the lead of the first thread in the first feed section is smaller than the lead of the first thread in the second feed section.
3. The venting screw according to claim 2, characterized in that: The lead of the first thread in the first homogenizing section is equal to the lead of the first thread in the first feeding section.
4. The venting screw according to claim 3, characterized in that: The lead of the second thread in the second homogenizing section is greater than the lead of the first thread in the first homogenizing section.
5. The venting screw according to claim 1, characterized in that: The separation groove separates the first thread into a main ridge and a secondary ridge extending spirally, the rear end face of the main ridge, the front end face of the secondary ridge and the surface of the first rod body define the separation groove, the rear end face of the secondary ridge, the front end face of the main ridge and the surface of the first rod body define a solid phase groove, and the volume of the solid phase groove gradually decreases from front to back.
6. The venting screw according to claim 5, characterized in that: The groove depth of the separation groove gradually increases from front to back, and the groove depth of the solid phase groove gradually decreases from front to back.
7. The venting screw according to claim 5, characterized in that: The lead of the main edge is equal from front to back, and the secondary edge is divided into a first segment, a second segment and a third segment from front to back. The lead of the first segment is greater than the lead of the second segment, and the lead of the third segment is greater than the lead of the second segment.
8. The venting screw according to claim 1, characterized in that: The lead of the third thread in the exhaust section is consistent with the lead of the second thread in the exhaust section.