Exhaust type extrusion device for PE thick plate production

Abstract

The exhaust type extrusion device comprises a machine barrel, an exhaust screw and a driving motor, an exhaust port is formed in the machine barrel, the exhaust screw comprises a rod body extending from front to back and a main thread spirally extending along the rod body, and the rod body sequentially comprises a feeding section, a compression section, a barrier section, an exhaust section and a homogenizing section from front to back; the main threads are distributed on the feeding section, the compression section, the exhaust section and the homogenization section, the lead of the main threads on the exhaust section is larger than that of the main threads on other sections, the exhaust section is further provided with auxiliary threads with the lead and the outer diameter consistent with those of the main threads of the exhaust section, and the depth of a screw groove formed by the main threads and the auxiliary threads on the exhaust section is larger than or equal to 1 / 5 of the outer diameter of the main threads; the exhaust port is formed in the circumferential direction of the exhaust section. The machine barrel is provided with the exhaust port for releasing gas in the machine barrel, and the special exhaust screw is arranged in the machine barrel, so that gas and water vapor are fully exhausted in the extrusion process of materials, and the surface smoothness and quality of a final product are improved.

Description

Technical Field

[0001] The present application relates to the technical field of plastic sheet production equipment, and in particular to an exhaust type extrusion device for producing PE thick sheets. Background Art

[0002] At present, the raw materials of PE thick plates are usually processed by JWS200 / 33 extruders. The extruders do not exhaust gas and have low output, which makes the gas and water vapor content in the extruded materials too high and contains bubbles, thus affecting the surface finish and quality of the final PE thick plates. Summary of the invention

[0003] In order to solve the above-mentioned technical problems, the purpose of the present application is to provide a venting extrusion device for the production of PE thick plates.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: an exhaust extrusion device for the production of PE thick plates, comprising a barrel, an exhaust screw coaxially arranged in the barrel, and a drive motor drivingly connected to the exhaust screw, the barrel is provided with an exhaust port for the gas in the barrel to discharge the extrusion device, the exhaust screw comprises a rod body extending from front to back and a main thread extending spirally along the rod body, the rod body is composed of a feed section, a compression section, a barrier section, an exhaust section and a homogenizing section from front to back, the main threads are distributed in the feed section, the compression section, the exhaust section and the homogenizing section, and the The lead of the main thread in the exhaust section is greater than the lead of the main thread in other sections. The exhaust section is also provided with a secondary thread whose lead and outer diameter are consistent with those of the main thread of the exhaust section. The depth of the screw groove formed by the main thread and the secondary thread in the exhaust section is greater than or equal to 1 / 5 of the outer diameter of the main thread; the volume of the screw groove formed by the main thread in the compression section gradually decreases; the barrier section has a plurality of feed grooves and a plurality of discharge grooves, and the plurality of feed grooves and the plurality of discharge grooves are alternately distributed along the circumference of the rod body; the exhaust port is opened in the circumference of the exhaust section.

[0005] In the above technical solution, it is further preferred that the bottom diameters of the feed section, the compression section, the barrier section and the homogenization section are all larger than the bottom diameter of the exhaust section.

[0006] In the above technical solution, it is further preferred that the bottom diameter of the compression section gradually increases from front to back.

[0007] In the above technical solution, it is further preferred that the outer diameter of the main thread on the rod body is uniform from front to back.

[0008] In the above technical solution, it is further preferred that the lengths of the feed section, the barrier section, the exhaust section and the homogenization section are all smaller than the length of the compression section.

[0009] In the above technical solution, it is further preferred that the length of the exhaust section is 1 / 12 of the length of the rod body.

[0010] In the above technical solution, it is further preferred that the plurality of feed troughs and the plurality of discharge troughs extend spirally along the rod body in the same rotation direction, each of the feed troughs and each of the discharge troughs has an angle with the axis of the rod body, and the angle is 30°.

[0011] In the above technical solution, it is further preferred that the groove depth of the feed trough gradually increases from front to back, and the groove depth of the discharge trough gradually decreases from front to back.

[0012] In the above technical solution, it is further preferred that the exhaust type extrusion device further includes a plurality of heating components, and the plurality of heating components are arranged on the barrel in sequence from front to back.

[0013] In the above technical solution, it is further preferred that a storage hopper is provided on the barrel, and the storage hopper is arranged in the circumference of the feeding section to transport materials to the feeding section.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The barrel of the present application is provided with an exhaust port for releasing the gas in the barrel, and a dedicated exhaust screw is configured inside the barrel to allow the material to fully exhaust gas and water vapor during the extrusion process, thereby improving the surface finish and quality of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of an exhaust type extrusion device provided in an embodiment of the present application; Figure 2 for Figure 1 A schematic diagram of the structure of the exhaust screw; Figure 3 for Figure 2 Schematic diagram of the structure of the barrier segment in FIG. Figure 4 for Figure 2 Schematic diagram of the exhaust section.

[0016] Among them: 100, exhaust type extrusion device; 10, barrel; 1, exhaust port; 20, exhaust screw; 2, rod body; 21, feed section; 22, compression section; 23, barrier section; 24, exhaust section; 25, homogenization section; 3, main thread; 4, feed trough; 5, discharge trough; 6, barrier; 7, secondary thread; 8, exhaust trough; 30, drive motor; 40, storage hopper; 50, heating component. DETAILED DESCRIPTION

[0017] To describe the technical content, structural features, achieved purpose and effect of the application in detail, the technical solutions in the embodiments of the application will be described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the 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 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 shape, structure and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0018] In the description of the present application, unless otherwise specified, “plurality” means two or more.

[0019] The “front” and “back” mentioned in this application are as follows: Figure 1 Before and after shown.

[0020] In the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0021] The present application embodiment provides a venting extrusion device for producing PE thick plates, such as Figure 1 , 2 As shown, the exhaust type extrusion device 100 includes a barrel 10, an exhaust screw 20 coaxially arranged in the barrel 10, and a drive motor 30 connected to the exhaust screw 20. The drive motor 30 is used to drive the exhaust screw 20 to rotate around its own axis X in the barrel 10. 1 The barrel 10 is provided with an exhaust port 1 for exhausting the gas in the barrel 10 of the exhaust extrusion device 100, which is used to release the air in the material in the barrel 10, reduce the gas and water vapor in the material, and effectively improve the quality of the material.

[0022] like Figure 2As shown, the exhaust screw 20 includes a rod body 2 extending from front to back and a main thread 3 extending spirally along the rod body 2. The rod body 2 is divided into a feed section 21, a compression section 22, a barrier section 23, an exhaust section 24 and a homogenizing section 25 from front to back. The outer diameter of the main thread 3 is evenly and unchangedly distributed in the feed section 21, the compression section 22, the exhaust section 24 and the homogenizing section 25. The lead of the main thread 3 in the feed section 21 and the compression section 22 is consistent, and the bottom diameter of the compression section 22 gradually increases from front to back. The gradually increasing bottom diameter cooperates with the main thread 3 with the unchanged outer diameter, so that the main thread 3 forms a screw groove with a gradually decreasing volume on the compression section 22, and the bottom diameter of the feed section 21 is equal to the minimum bottom diameter of the compression section 22.

[0023] like Figure 1 , 2 As shown, the barrel 10 is connected to a storage hopper 40, which is located above the barrel 10 and arranged in the circumference of the feed section 21. The storage hopper 40 transports the materials to the feed section 21 in a centralized manner. The screw grooves with equal volumes on the feed section 21 stably transport the materials to the compression section 22; the screw grooves with gradually decreasing volumes on the compression section 22 compress the materials, so that the materials are initially melted in the compression section. The length of the compression section 22 is greater than the length of the feed section 21, the barrier section 23, the exhaust section 24 and the homogenization section 25. The longer compression section 22 stabilizes the conveying pressure of the materials.

[0024] like Figure 2 , 3 As shown, the barrier section 23 is provided with a plurality of feed troughs 4 and a plurality of discharge troughs 5, and a barrier 6 is provided between adjacent feed troughs 4 and discharge troughs 5 to shear the material; each feed trough 4 and each discharge trough 5 are spirally extended along the rod body 2 in the same direction of rotation, and each feed trough 4 and each discharge trough 5 are parallel to the axis X 1 There is an angle α, which is 30°. Several feed grooves 4 and several discharge grooves 5 are alternately distributed along the circumference of the rod body 2, and the groove depth of each feed groove 4 gradually increases from front to back to introduce the material transported by the compression section 22 into the barrier section 23; when the exhaust screw 20 rotates, the material passes through the feed groove 4 and rotates to the downstream barrier and enters the corresponding discharge groove 5, and the material is further melted and plasticized by the severe shear of the barrier 6; the groove depth of each discharge groove 5 gradually decreases from front to back to transport the plasticized material to the exhaust section 24.

[0025] like Figure 2 , 4As shown, the exhaust section 24 is also provided with secondary threads 7 that are arranged alternately with the main threads 3 in the axial direction of the rod body 2. The lead and outer diameter of the secondary threads 7 are consistent with the main threads 3 and extend spirally in the exhaust section 24. The lead of the main threads 3 in the exhaust section 24 is greater than the lead in other sections. The bottom diameter of the exhaust section 24 is smaller than the bottom diameter of other sections, so that the rod body 2 has a larger compression ratio, and the groove depth of the exhaust groove 8 formed by the main threads 3 and the secondary threads 7 in the exhaust section 24 is greater than or equal to 1 / 5 of the outer diameter of the main threads 3. The deeper exhaust groove 8 in the exhaust section 24 improves the material conveying efficiency, and the larger compression ratio can quickly squeeze out the gas and water vapor in the material. Figure 1 , 2 As shown, the exhaust port 1 is arranged in the circumference of the exhaust section 24, and the gas and water vapor squeezed out of the material in the exhaust section 24 are discharged from the barrel 10 from the exhaust port 1. The length of the exhaust section 24 is 1 / 12 of the length of the rod body 2, so that the gas and water vapor in the material can be fully discharged, which is beneficial to the extrusion and molding of the material.

[0026] like Figure 2 As shown, the bottom diameter of the homogenizing section 25 is larger than the bottom diameters of the exhaust section 24 and the feed section 21, and the main threads 3 are evenly arranged on the homogenizing section 25, so that the extrusion pressure of the material output from the exhaust section 24 is stabilized in the homogenizing section 25. The extrusion pressure of the material extruded from the exhaust screw 20 is stable, there are no bubbles inside, and the product finally extruded by the extrusion die has high flatness and high surface finish.

[0027] like Figure 1 As shown, the exhaust type extrusion device 100 also includes a plurality of heating components 50, which are arranged on the barrel 10 in sequence from front to back. The heating components 50 are used to heat the barrel 10 so that the temperature inside the barrel 10 can quickly reach the process temperature so that the exhaust type extrusion device 100 can quickly enter the extrusion operation.

[0028] The exhaust extruder 100 further includes an air cooling mechanism (not shown in the figure), which is used to reduce the temperature of the barrel 10 to prevent the temperature in the barrel from being too high, thereby affecting the plasticization of the material. The air cooling mechanism and the heating component 50 cooperate with the exhaust screw 20 to fully melt and plasticize the material at a suitable temperature, thereby improving the plasticization effect.

[0029] The barrel of the present application is provided with an exhaust port for releasing the gas in the barrel, and a dedicated exhaust screw is configured inside the barrel to allow the material to fully exhaust gas and water vapor during the extrusion process, thereby improving the surface finish and quality of the final product.

[0030] 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 descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, and the scope of protection required by the present application is defined by the attached claims, description and their equivalents.

Claims

1. A venting extrusion device for producing PE thick plates, comprising a barrel, a venting screw coaxially arranged in the barrel, and a driving motor drivingly connected to the venting screw, wherein the barrel is provided with an exhaust port for the gas in the barrel to be discharged from the extrusion device, It is characterized in that The exhaust screw comprises a rod body extending from front to back and a main thread extending spirally along the rod body. The rod body is composed of a feed section, a compression section, a barrier section, an exhaust section and a homogenizing section from front to back. The main threads are distributed in the feed section, the compression section, the exhaust section and the homogenizing section. The lead of the main thread in the exhaust section is greater than the lead of the main thread in other sections. The exhaust section is also provided with a secondary thread whose lead and outer diameter are consistent with those of the main thread in the exhaust section. The depth of the screw groove formed by the main thread and the secondary thread in the exhaust section is greater than or equal to 1 / 5 of the outer diameter of the main thread. The volume of the screw groove formed by the main thread in the compression section gradually decreases. The barrier section has a plurality of feed grooves and a plurality of discharge grooves, and the plurality of feed grooves and the plurality of discharge grooves are alternately distributed along the circumference of the rod body. The exhaust port is opened in the circumference of the exhaust section.

2. The exhaust extrusion device according to claim 1, It is characterized in that The bottom diameters of the feed section, the compression section, the barrier section and the homogenization section are all larger than the bottom diameter of the exhaust section.

3. The exhaust extrusion device according to claim 2, It is characterized in that The bottom diameter of the compression section gradually increases from front to back.

4. The exhaust extrusion device according to claim 1, It is characterized in that The outer diameter of the main thread on the rod body is uniform from front to back.

5. The exhaust extrusion device according to claim 1, It is characterized in that The lengths of the feed section, the barrier section, the exhaust section and the homogenization section are all shorter than the length of the compression section.

6. The exhaust extrusion device according to claim 5, It is characterized in that The length of the exhaust section is 1 / 12 of the length of the rod body.

7. The exhaust extrusion device according to claim 1, It is characterized in that The plurality of feed troughs and the plurality of discharge troughs extend spirally along the rod body in the same rotation direction, and each of the feed troughs and each of the discharge troughs have an angle with the axis of the rod body, and the angle is 30°.

8. The exhaust extrusion device according to claim 7, It is characterized in that The depth of the feed trough gradually increases from front to back, and the depth of the discharge trough gradually decreases from front to back.

9. The exhaust extrusion device according to claim 1, It is characterized in that The exhaust type extrusion device further comprises a plurality of heating components, and the plurality of heating components are arranged on the barrel in sequence from front to back.

10. The exhaust extrusion device according to claim 1, It is characterized in that The barrel is provided with a storage hopper, and the storage hopper is arranged in the circumference of the feeding section to transport materials to the feeding section.

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