Reducing screw for sheet production
By designing a variable diameter screw for sheet production, the existing screws are solved to solve the problems of cutting difficulties and product surface defects when dealing with broken materials, effective compression of materials and air removal, and improved production efficiency and plasticization quality.
Patent Information
- Application Number
- CN202422215795.X
- 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
When the existing screws used for sheet sheet products deal with fluffy and irregularly shaped crushed materials, they are prone to problems such as difficulty in cutting, bridge formation, fluctuation, insufficient melt compression, poor plasticization quality, low extrusion output, and the pile density of crushed materials is small and a large amount of air is entrained, resulting in product surface defects.
A variable diameter screw for sheet production is designed, including a first-order screw portion and a second-order screw portion that is removably connected. Through the change of the screw groove volume of the feeding section, compression section and transition section of the first-order screw part, as well as the design of the screw groove of the exhaust section, variable diameter section and homogenization section of the second-order screw part, effective compression of materials and air removal are achieved.
This variable diameter screw can effectively handle fluffy materials, improve the service life and production efficiency of the screw, ensure the compactness and plasticization quality of the material, and reduce product surface defects.
Smart Images
Figure CN223030321U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of plastic product production equipment, and in particular to a variable-diameter screw for sheet production. Background Art
[0002] For the current screws for crushing materials of sheet products, since the crushing materials are all fluffy and irregular in shape, problems such as difficult feeding, bridging, fluctuation, insufficient melt compression, poor plasticization quality, and low extrusion output are likely to occur; at the same time, in order to reduce the formula cost, a large amount of crushing materials are added and used, resulting in a decrease in the feeding capacity of conventional screws, low extrusion output, and the stacking density of the crushing materials is small, the material voids are large, and a large amount of air is entrained and cannot be removed completely, resulting in different degrees of defects on the surface of the products. Summary of the Invention
[0003] In order to solve the above technical problems, the purpose of this application is to provide a variable-diameter screw for sheet production.
[0004] To achieve the above object, this application adopts the following technical solution: A variable-diameter screw for sheet production includes a first-order screw part and a second-order screw part detachably connected to the rear end of the first-order screw part. The first-order screw part includes a first rod body extending from front to back, a first thread spirally extending along the first rod body from front to back, and a mixing group arranged at the rear end of the first rod body. The first rod body is successively a feeding section, a compression section, and a transition section from front to back. The first thread forms a first helical groove spirally extending on the first rod body. The volume of the first helical groove in the feeding section is equal and unchanged from front to back. The volume of the first helical groove in the compression section gradually decreases from front to back. The volume of the first helical groove in the transition section is equal and unchanged from front to back, and is smaller than the volume of the first helical groove in the feeding section. The mixing group includes several radially outwardly protruding mixing protrusions, and several of the mixing protrusions are spaced apart along the circumferential direction of the first rod body. The second-order screw part includes a second rod body and a second thread spirally extending along the second rod body from front to back. The second rod body is successively an exhaust section, a variable-diameter section, and a homogenizing section from front to back. The second thread forms a second helical groove spirally extending on the second rod body. The volume of the second helical groove in the exhaust section is larger than the volume of the second helical groove in the homogenizing section. The volume of the second helical groove in the variable-diameter section gradually decreases from front to back.
[0005] In the above technical solution, further preferably, a threaded hole is provided at the rear end of the first-order screw part, and the front end of the second-order screw part has a threaded part extending into the threaded hole, and the threaded part is in threaded cooperation with the threaded hole. The thread directions of the threaded hole and the threaded part are the same, and the thread direction of the threaded hole is opposite to the thread directions of the first thread and the second thread.
[0006] In the above technical solution, further preferably, the compression section includes a first compression sub-section and a second compression sub-section. The outer diameter of the first thread gradually decreases from front to back in the first compression sub-section, and the first thread has a maximum outer diameter and a minimum outer diameter in the first compression sub-section; the bottom diameter of the second compression sub-section gradually increases from front to back, and the second compression sub-section has a maximum bottom diameter and a minimum bottom diameter.
[0007] In the above technical solution, further preferably, the outer diameter of the first thread in the feeding section is equal to the maximum outer diameter, the outer diameter of the first thread in the transition section is equal to the minimum outer diameter, the outer diameter of the second thread is equal to the minimum outer diameter, the lead of the first thread in the feeding section is greater than the lead of the first thread in the transition section, the lead of the second thread is uniformly unchanged from front to back, and is equal to the lead of the first thread in the transition section.
[0008] In the above technical solution, further preferably, the bottom diameters of the feeding section and the first compression sub-section are equal to the minimum bottom diameter, the bottom diameter of the transition section is equal to the maximum bottom diameter, the bottom diameter of the exhaust section is smaller than the minimum bottom diameter, and the bottom diameter of the homogenization section is greater than the minimum bottom diameter and smaller than the maximum bottom diameter.
[0009] In the above technical solution, further preferably, a cooling hole is provided in the core of the first-order screw part, and the cooling hole extends in the front-rear direction and corresponds to the position of the feeding section.
[0010] The present application has the following beneficial effects compared with the prior art:
[0011] The second-order screw of the present application ensures the normal recycling of fluffy and irregularly shaped broken materials, overcomes the problem that the thread edges of the feeding section of the current conventional screw are easily worn, and improves the service life of the screw. The structure of the first-order screw part takes advantage of the variable-diameter screw to increase the screw strength while ensuring the feeding volume, improving the production efficiency and the quality of material melting and plasticization. This variable-diameter screw also has an exhaust function, which removes the air brought in by the feeding, the volatiles and water vapor generated by melting, ensures the quality of melting and plasticization, and improves the product performance. Description of the Drawings
[0012] Figure 1 Schematic structural diagram of a variable-diameter screw provided by an embodiment of the present application;
[0013] Figure 2 is Figure 1 schematic structural diagram of the first-order screw part in
[0014] Figure 3 is Figure 2 schematic structural diagram of the compression section in
[0015] Figure 4 is Figure 2 schematic structural diagram of the mixing group in
[0016] Figure 5 is a sectional view taken along the Figure 4 A-A line in
[0017] Figure 6 is Figure 1 schematic structural diagram of the second-order screw part in
[0018] Wherein: 100, variable-diameter screw; 10, first-order screw part; 1, first rod body; 11, feeding section; 12, compression section; 121, first compression subsection; 122, second compression subsection; 13, transition section; 14, threaded hole; 15, cooling hole; 2, first thread; 3, mixing group; 31, mixing protrusion; 20, second-order screw part; 4, second rod body; 41, exhaust section; 42, variable-diameter section; 43, homogenization section; 44, threaded part; 5, second thread. Detailed implementation manners
[0019] 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 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 they do not have to be exclusive. For example, without departing from the inventive concept, the specific shapes, structures and characteristics of the exemplary embodiments can be used or implemented in another exemplary embodiment.
[0020] An embodiment of the present application provides a variable-diameter screw for sheet production, as shown in Figure 1As shown, the variable-diameter screw 100 includes a first-order screw part 10 and a second-order screw part 20. Both the first-order screw part 10 and the second-order screw part 20 extend in the front-rear direction. The front end part of the second-order screw part 20 is detachably connected to the rear end part of the first-order screw part 10. The variable-diameter screw 100 is configured as a split type, which is convenient for replacement when the screw is worn, and only the first-order screw part 10 or the second-order screw part 20 can be replaced according to the wear condition, reducing costs.
[0021] As Figure 1 , 2 shown, the first-order screw part 10 includes a first rod body 1 extending from front to back, a first thread 2 spirally extending along the first rod body 1 from front to back, and a mixing group 3 arranged at the rear end part of the first rod body 1. The first rod body 1 is successively a feeding section 11, a compression section 12, and a transition section 13 from front to back. The first thread 2 forms a first screw groove spirally extending on the first rod body 1. The volume of the first screw groove in the feeding section 11 remains equal from front to back. The volume of the first screw groove in the compression section 12 gradually decreases from front to back. The volume of the first screw groove in the transition section 13 remains equal from front to back and is smaller than the volume of the first screw groove in the feeding section 11.
[0022] As Figure 2 , 3 shown, the compression section 12 includes a first compression subsection 121 and a second compression subsection 122. The outer diameter of the first thread 2 gradually decreases from front to back in the first compression subsection 121. The first thread 2 has a maximum outer diameter D1 and a minimum outer diameter D2 in the first compression subsection 121. The bottom diameter of the second compression subsection 122 gradually increases from front to back. The second compression subsection 122 has a maximum bottom diameter d1 and a minimum bottom diameter d2.
[0023] The outer diameter of the first thread 2 in the feeding section 11 is equal to the maximum outer diameter D1. The outer diameter of the first thread 2 in the transition section 13 is equal to the minimum outer diameter D2. The lead S2 of the first thread 2 gradually decreases in the compression section 12. The lead S1 of the first thread 2 in the feeding section 11 is greater than the lead S3 of the first thread 2 in the transition section 13.
[0024] The bottom diameters of the feeding section 11 and the first compression subsection 121 are equal to the minimum bottom diameter d2. The bottom diameter of the transition section 13 is equal to the maximum bottom diameter d1.
[0025] The change in the bottom diameter, the change in the outer diameter of the thread, and the change in the lead of the first-order screw part 10 make the volume of the first screw groove gradually become smaller from front to back. The volume of the first screw groove in the feeding section 11 is large, ensuring the feeding capacity and the conveying stability of the variable-diameter screw 100. The change in the volume of the first screw groove in the compression section 12 provides a greater geometric compression ratio for the material on the variable-diameter screw 100, preventing material backflow and ensuring the density and plasticization quality of the material.
[0026] As Figure 2 ,4 As shown in Fig. 5, the kneading group 3 includes a number of kneading protrusions 31 protruding radially outward, and the number of kneading protrusions 31 are circumferentially spaced along the circumferential direction of the first rod body 1; the kneading group 3 stirs and mixes the molten material conveyed from the first-order screw part 10 to the second-order screw part 20, further improving the plasticization quality and enabling the second-order screw part 20 to better exhaust the molten material.
[0027] As Figure 6 shown, the second-order screw part 20 includes a second rod body 4 and a second thread 5 spirally extending backward along the second rod body 4. The second rod body 4 is successively an exhaust section 41, a diameter-changing section 42, and a homogenizing section 43 from front to back. The second thread 5 forms a spirally extending second screw groove on the second rod body 4. The volume of the second screw groove in the exhaust section 41 is larger than that of the second screw groove in the homogenizing section 43, and the volume of the second screw groove in the diameter-changing section 42 gradually decreases from front to back.
[0028] The lead S4 and the outer diameter of the second thread 5 are both equal and unchanged from front to back. The lead S4 of the second thread 5 is equal to the lead S3 of the first thread 2 in the transition section 13, and the outer diameter of the second thread 5 is equal to the minimum outer diameter d2.
[0029] The bottom diameter of the exhaust section 41 is smaller than the minimum bottom diameter d2, and the bottom diameter of the homogenizing section 43 is larger than the minimum bottom diameter d2 and smaller than the maximum bottom diameter d1.
[0030] The change in the bottom diameter of the second rod body 4 makes the depth of the second screw groove in the exhaust section 41 larger, and the molten material fully releases gas in the exhaust section 41, avoiding the influence of gas in the material on the quality of the final product. The depth of the second screw groove in the diameter-changing section 42 gradually decreases to compress and stabilize the molten material. The depth of the second screw groove in the homogenizing section 43 is smaller and the volume is stable, which is used to stabilize and extrude the molten material at the end of the variable-diameter screw 100.
[0031] As Figure 1 , 2 As shown in Fig. 6, a threaded hole 14 is provided at the rear end of the first-order screw part 10, and the front end of the second-order screw part 20 has a threaded part 44 extending into the threaded hole 14, and the threaded part 44 is in threaded cooperation with the threaded hole 14. The thread directions of the threaded hole 14 and the threaded part 44 are the same, and the thread direction of the threaded hole 14 is opposite to the thread directions of the first thread 2 and the second thread 5, so that the threaded hole 14 of the first-order screw part 10 and the threaded part 44 of the second-order screw part 20 are tightened more and more during the rotation of the variable-diameter screw 100, ensuring the reliability of the variable-diameter screw 100 and improving the convenience of replacing the screw part. A stop structure is also provided between the first-order screw part 10 and the second-order screw part 20 for positioning the two.
[0032] A cooling hole 15 is provided in the core of the first-order screw portion 10. The cooling hole 15 extends in the front-rear direction and corresponds to the position of the feeding section 11. Cooling water is passed through the cooling hole 15 to control the temperature of the variable-diameter screw 100 and prevent the screw from overheating and burning the material.
[0033] The foregoing has shown and described 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. The above embodiments and the description in the specification are only for explaining 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 claimed by the present application is defined by the appended claims, the specification and their equivalents.
Claims
1. A variable diameter screw for sheet production, characterized in that: The invention comprises a first-stage screw part and a second-stage screw part detachably connected to the rear end of the first-stage screw part, wherein the first-stage screw part comprises a first rod body extending from front to back, a first thread extending spirally from front to back along the first rod body, and a mixing group arranged at the rear end of the first rod body, wherein the first rod body is sequentially divided into a feeding section, a compression section and a transition section from front to back, wherein the first thread forms a first spirally extending screw groove on the first rod body, wherein the volume of the first screw groove of the feeding section is uniform and unchanged from front to back, the volume of the first screw groove of the compression section gradually decreases from front to back, and the volume of the first screw groove of the transition section increases from front to back. The volume of the first screw groove of the feeding section is equal and unchanged, and is smaller than that of the first screw groove of the feeding section; the mixing group includes a plurality of mixing protrusions protruding radially outward, and the plurality of mixing protrusions are distributed at intervals along the circumference of the first rod body; the second-stage screw portion includes a second rod body and a second thread extending spirally from front to back along the second rod body, and the second rod body is composed of an exhaust section, a diameter-changing section and a homogenizing section from front to back in sequence, and the second thread forms a spirally extending second screw groove on the second rod body, and the volume of the second screw groove of the exhaust section is greater than that of the second screw groove of the homogenizing section, and the volume of the second screw groove of the diameter-changing section gradually decreases from front to back.
2. The variable diameter screw according to claim 1, characterized in that: A threaded hole is provided at the rear end of the first-stage screw portion, and a threaded portion is provided at the front end of the second-stage screw portion that extends into the threaded hole, and the threaded portion is threadedly matched with the threaded hole, the threaded hole and the threaded portion have the same thread rotation direction, and the threaded direction of the threaded hole is opposite to the thread rotation direction of the first thread and the second thread.
3. The variable diameter screw according to claim 1, characterized in that: The compression section includes a first compression section and a second compression section. The outer diameter of the first thread gradually decreases from front to back in the first compression section, and the first thread has a maximum outer diameter and a minimum outer diameter in the first compression section; the bottom diameter of the second compression section gradually increases from front to back, and the second compression section has a maximum bottom diameter and a minimum bottom diameter.
4. The variable diameter screw according to claim 3, characterized in that: The outer diameter of the first thread of the feeding section is equal to the maximum outer diameter, the outer diameter of the first thread of the transition section is equal to the minimum outer diameter, the outer diameter of the second thread is equal to the minimum outer diameter, the lead of the first thread of the feeding section is greater than the lead of the first thread of the transition section, and the lead of the second thread is uniform from front to back and is equal to the lead of the first thread of the transition section.
5. The variable diameter screw according to claim 4, characterized in that: The bottom diameters of the feeding section and the first compression section are equal to the minimum bottom diameter, the bottom diameter of the transition section is equal to the maximum bottom diameter, the bottom diameter of the exhaust section is smaller than the minimum bottom diameter, and the bottom diameter of the homogenizing section is larger than the minimum bottom diameter and smaller than the maximum bottom diameter.
6. The variable diameter screw according to claim 1, characterized in that: The core of the first-stage screw portion is provided with cooling holes, which extend in the front-rear direction and correspond to the position of the feeding section.