Extrusion device for high molecular weight material

Abstract

The extrusion device comprises a rack, a machine barrel, an extrusion screw rod, a driving motor and an extrusion mold, the extrusion screw rod 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 discharging section, a conveying section, a barrier section and a mixing section from front to back; the main threads are arranged on the blanking section and the conveying section; the discharging section is further provided with an auxiliary thread with the lead and the outer diameter consistent with those of the main thread. The depth of a screw groove formed by the main thread and the auxiliary thread on the rod body is 1 / 16 of the outer diameter of the main thread; a plurality of heating control parts are sequentially arranged on the machine barrel from front to back and are positioned in the circumferential directions of the conveying section, the barrier section and the mixing section; by means of the low-shear high-conveying extrusion screw and the heating control component for accurately controlling the temperature on the machine barrel, materials are controlled to be plasticized and conveyed within a proper range, the device is particularly suitable for high-molecular-weight materials with the molecular weight of 500,000, and the fluidity of the high-molecular-weight materials is improved.

Description

Technical Field

[0001] The present application relates to the technical field of plastic extrusion equipment, and in particular to an extrusion device for high molecular weight materials. Background Art

[0002] At present, traditional extruders are suitable for producing materials with a molecular weight of 1000-9000. For high molecular weight materials with a molecular weight of 500,000, the shear strength of the extrusion screw of the current extruder is too large, which makes the high molecular weight materials easily adhere to the screw, affecting the extrusion efficiency. In addition, the materials are easily overheated and burned, wasting raw materials and affecting the quality of the final product. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present application is to provide an extrusion device for high molecular weight materials.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: an extrusion device for high molecular weight materials, comprising: a frame, a barrel arranged on the frame, an extrusion screw coaxially inserted in the barrel, a driving motor drivingly connected to the extrusion screw, and an extrusion die connected to the barrel, the extrusion screw comprising a rod body extending from front to back and a main thread extending spirally along the rod body, the rod body being divided into a feeding section, a conveying section, a barrier section and a mixing section from front to back, the main thread being arranged in the feeding section and the conveying section, and the lead of the main thread in the feeding section is consistent with the lead in the conveying section; The unloading section is also provided with a secondary thread whose lead and outer diameter are consistent with those of the main thread, and the main thread and the secondary thread are alternately arranged in the axial direction of the unloading section; the depth of the screw groove formed by the main thread and the secondary thread on the rod body is 1 / 16 of the outer diameter of the main thread; the barrier section is provided with a plurality of feed grooves and a plurality of discharge grooves parallel to the axial center line of the rod body; the mixing section is provided with a plurality of spirally extended mixing groups; the barrel is provided with a plurality of heating control components arranged in sequence from front to back, and the plurality of heating control components are located in the circumference of the conveying section, the barrier section and the mixing section.

[0005] In the above technical solution, it is further preferred that the length of the conveying section is greater than the lengths of other sections, and the length of the conveying section is greater than or equal to 3 times the length of the unloading section.

[0006] In the above technical solution, it is further preferred that the feed trough and the discharge trough are alternately arranged in the circumferential direction of the rod body, and at least a part of each of the feed troughs is located on the front side of the adjacent discharge trough, and at least a part of each of the discharge troughs is located on the rear side of the adjacent feed trough.

[0007] In the above technical solution, it is further preferred that the plurality of mixing groups are arranged in sequence along the circumference of the rod body, and each of the mixing groups includes a plurality of radially protruding mixing parts.

[0008] In the above technical solution, it is further preferred that the barrel is provided with a feed hopper for the material to enter the inside of the barrel from the outside of the barrel, and the feed hopper is located in the circumferential direction of the unloading section.

[0009] In the above technical solution, it is further preferred that the drive motor is located at the front side of the barrel, the drive motor is transmission-connected to the extrusion screw through a reduction gearbox, and the drive motor is used to drive the extrusion screw to rotate around its own axis.

[0010] In the above technical solution, it is further preferred that the extrusion die is arranged on the rear side of the barrel, and a screen changing component and a metering pump are arranged between the extrusion die and the barrel.

[0011] In the above technical solution, it is further preferred that each of the heating control components includes a temperature sensor and a temperature adjustment component arranged on the barrel, the temperature sensor is used to detect the temperature inside the barrel, and the temperature adjustment component is used to adjust the temperature of the barrel.

[0012] In the above technical solution, it is further preferred that the extrusion device also includes a controller, and the controller is connected to the temperature sensors of each heating control component and the temperature adjustment component signals, and the controller is configured to control the temperature output of the corresponding temperature adjustment component based on the detection results of each temperature sensor.

[0013] In the above technical solution, it is further preferred that the surface finish of the extrusion screw is 0.2.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present application controls the material within a suitable temperature range for plasticization and conveying through a low-shear, high-conveyance extrusion screw and a heating control component on the barrel that accurately controls the temperature. The material is particularly suitable for high molecular weight materials with a molecular weight of 500,000, and can effectively prevent the high molecular weight material from sticking to the extrusion screw during conveying, thereby increasing the fluidity of the high molecular weight material and improving the conveying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of an extrusion device for high molecular weight materials provided in an embodiment of the present application.

[0016] Figure 2for Figure 1 Schematic diagram of the structure of the extrusion 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 expansion of the mixing section in .

[0017] Among them: 100, extrusion device; 10, frame; 20, barrel; 7, feed hopper; 30, extrusion screw; 1, rod body; 11, unloading section; 12, conveying section; 13, barrier section; 14, mixing section; 2, main thread; 3, secondary thread; 4, feed trough; 5, discharge trough; 6, mixing group; 61, mixing section; 40, drive motor; 50, extrusion die; 60, heating control component; 70, reduction box; 80, screen changing component; 90, metering pump. DETAILED DESCRIPTION

[0018] 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.

[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 provides an extrusion device for high molecular weight materials, the extrusion device 100 is used to fully plasticize the raw materials and extrude them into products, such as Figure 1 As shown, the extrusion device 100 includes a frame 10, a barrel 20 arranged on the frame 10, an extrusion screw 30 coaxially arranged in the barrel 20, a drive motor 40 drivingly connected to the extrusion screw 30, and an extrusion die 50 connected to the barrel 20. The drive motor 40 is located at the front side of the barrel 20 and is used to drive the extrusion screw 30 to rotate around its own axis X.1 rotation; the extrusion screw 30 is rotatably disposed in the barrel 20 to forwardly convey the material entering the barrel 20; the extrusion die 50 is located at the rear side of the barrel 20 for receiving the material output by the extrusion screw 30 and extruding the material into shape; the barrel 20 is mounted on the frame 10 and supported on the ground by the frame 10.

[0022] like Figure 2 As shown, the extrusion screw 30 includes a rod body 1 extending from front to back and a main thread 2 spirally extending along the rod body 1. The rod body 1 is composed of a feeding section 11, a conveying section 12, a barrier section 13 and a mixing section 14 from front to back, and the main thread 2 is distributed in the feeding section 11 and the conveying section 12.

[0023] The unloading section 11 is also provided with a secondary thread 3 having the same lead and outer diameter as the main thread 2. The main thread 2 and the secondary thread 3 are alternately arranged in the axial direction of the unloading section 11. The double thread of the unloading section 11 increases the feed amount of the unloading section 11 and improves the conveying efficiency of the material in the unloading section 11.

[0024] The length of the conveying section 12 is greater than that of other sections, the bottom diameters of the unloading section 11 and the conveying section 12 remain unchanged from front to back, the outer diameters of the main thread 2 and the auxiliary thread 3 remain unchanged from front to back, the main thread 2 and the auxiliary thread 3 form a screw groove with equal volume in the unloading section 11, the depth of the screw groove formed by the main thread 2 and the auxiliary thread 3 is 1 / 16 of the outer diameter of the main thread 2, the shallower main thread 2 and the auxiliary thread 3 reduce the shear force of the extrusion screw 30 on the material, and when conveying high molecular weight materials, effectively reduce the temperature of the extrusion screw 30 to avoid the adhesion of the high molecular weight materials to the extrusion screw 30, thereby improving the conveying efficiency of the extrusion screw 30 for the high molecular weight materials.

[0025] In the embodiment of the present application, the surface cleanliness of the extrusion screw 30 is 0.2, and the smooth surface effectively avoids the adhesion of high molecular weight materials and increases the fluidity of the materials in the barrel 20.

[0026] like Figure 1 , 2 As shown, the extrusion device 100 also includes a plurality of heating control components 60 disposed on the barrel 20. The plurality of heating control components 60 are sequentially arranged on the barrel 20 from front to back and are located in the circumference of the conveying section 12, the barrier section 13 and the mixing section 14. The plurality of heating control components 60 are used to control the temperature in the barrel 20 at the process temperature so that the high molecular weight material can be melted and plasticized in the barrel 20. In the embodiment of the present application, the length of the conveying section 12 is greater than or equal to 3 times the length of the unloading section 11. The longer conveying section 12 enables the material to be fully melted and plasticized, thereby improving the quality of the final product. The region of the barrel 20 corresponding to the unloading section 11 is not provided with a heating control component 60 to prevent the material from melting in advance and clogging in the unloading section 11, thereby affecting the feeding of the extrusion screw 30.

[0027] like Figure 2 , 3 As shown, the barrier section 13 is provided with a plurality of feed slots 4 and a plurality of discharge slots 5, and the feed slots 4 and the discharge slots 5 are aligned with the axis X of the rod body 1. 1 The feed troughs 4 and the discharge troughs 5 are arranged in parallel and alternately in the circumferential direction of the barrier section 13. Part of each feed trough 4 is located in front of the adjacent discharge trough 5 to receive the material of the conveying section 12, and part of each discharge trough 5 is located in the rear of the adjacent feed trough 4 to convey the material to the mixing section 14. In order to comply with the flow law of the material, the depth of the feed trough 4 gradually increases from front to back, and the depth of the discharge trough 5 gradually decreases from front to back. The material enters the barrier section 13 from several feed troughs 4, and under the rotation of the extrusion screw 30, it crosses the barrier to the corresponding discharge trough 5 downstream, and is conveyed to the mixing section 14 through the gradually shallower discharge trough 5; the material is further plasticized in the barrier section 13 to improve the plasticizing effect of the material.

[0028] like Figure 2 , 4 As shown, a plurality of spirally extended mixing groups 6 are provided on the mixing section 14, and the plurality of mixing groups 6 are arranged in sequence along the circumference of the rod body 1, and each mixing group 6 includes a plurality of mixing parts 61 protruding radially outward, and the mixing parts 61 of the plurality of mixing groups 6 form mixing flow grooves with opposite rotation directions on the surface of the rod body 1, so that the material is fully mixed and stirred in the mixing section 14, and the output temperature is effectively reduced.

[0029] Each heating control component 60 includes a temperature sensor (not shown in the figure) and a temperature adjustment component (not shown in the figure) arranged on the barrel 20. The temperature sensor is used to detect the temperature in the barrel 20 in the corresponding area, and the temperature adjustment component is used to adjust the temperature of the barrel 20 in the corresponding area. The extrusion device 100 includes a controller (not shown in the figure), which is connected to the temperature sensor and the temperature adjustment component by signal. The controller controls the temperature output by the corresponding temperature adjustment component according to the detection results fed back by each temperature sensor, improves the automation degree of the extrusion device 100, makes the temperature in the barrel 20 controllable, controls the temperature in the barrel 20 within a reasonable range, avoids insufficient temperature or overheating, and is conducive to improving the plasticization effect of the material in the barrel 20. In the embodiment of the present application, the temperature adjustment component is a cast aluminum heating ring, which can surround the circumference of the barrel 20 and heat quickly and evenly.

[0030] like Figure 1 As shown, a reduction box 70 is also provided between the drive motor 40 and the extrusion screw 30. The reduction box 70 transmits rotation between the drive motor 40 and the extrusion screw 30, which is beneficial to improving the transmission efficiency. The drive motor 40 is connected to the controller signal, and the controller controls the speed output by the drive motor 40, thereby realizing the adjustment of the speed of the extrusion screw 30.

[0031] The barrel 20 is provided with a feed hopper 7 for introducing materials into the barrel 20 . The feed hopper 7 is arranged on the upper side of the barrel 20 and is located in the circumference of the unloading section 11 , so that the materials input by the feed hopper 7 are transported backwards by the double screw threads of the unloading section 11 .

[0032] A screen changing component 80 and a metering pump 90 are also provided between the barrel 20 and the extrusion die 50 . The screen changing component 80 is used to filter the material output by the extrusion screw 30 , and the metering pump 90 is used to adjust the flow rate of the material delivered to the extrusion die 50 .

[0033] The present application controls the material within a suitable temperature range for plasticization and conveying through a low-shear, high-conveyance extrusion screw 30 and a heating control component 60 for precisely controlling the temperature on the barrel 20. The material is particularly suitable for high molecular weight materials with a molecular weight of 500,000, and can effectively prevent the high molecular weight material from adhering to the extrusion screw during conveying, thereby increasing the fluidity of the high molecular weight material and improving the conveying efficiency.

[0034] 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. An extrusion device for high molecular weight materials, include: A frame, a barrel arranged on the frame, an extrusion screw coaxially arranged in the barrel, a driving motor drivingly connected to the extrusion screw, and an extrusion die connected to the barrel, characterized in that the extrusion screw comprises a rod body extending from front to back and a main thread spirally extending along the rod body, the rod body is sequentially divided into a feeding section, a conveying section, a barrier section and a mixing section from front to back, the main thread is arranged in the feeding section and the conveying section, the lead of the main thread in the feeding section is consistent with the lead in the conveying section; the feeding section is also arranged with a lead and an outer diameter that are the same as the The secondary thread is consistent with the main thread, and the main thread and the secondary thread are alternately arranged in the axial direction of the unloading section; the depth of the screw groove formed by the main thread and the secondary thread on the rod body is 1 / 16 of the outer diameter of the main thread; the barrier section is provided with a plurality of feed grooves and a plurality of discharge grooves parallel to the axial center line of the rod body; the mixing section is provided with a plurality of spirally extended mixing groups; the barrel is provided with a plurality of heating control components arranged in sequence from front to back, and the plurality of heating control components are located in the circumference of the conveying section, the barrier section and the mixing section.

2. The extrusion device according to claim 1, It is characterized in that The length of the conveying section is greater than the lengths of other sections, and the length of the conveying section is greater than or equal to 3 times the length of the unloading section.

3. The extrusion device according to claim 1, It is characterized in that The feed troughs and the discharge troughs are alternately arranged in the circumferential direction of the rod body, and at least a portion of each feed trough is located in front of an adjacent discharge trough, and at least a portion of each discharge trough is located in the rear of an adjacent feed trough.

4. The extrusion device according to claim 1, It is characterized in that The plurality of mixing groups are arranged in sequence along the circumference of the rod body, and each of the mixing groups includes a plurality of radially protruding mixing parts.

5. The extrusion device according to claim 1, It is characterized in that The barrel is provided with a feed hopper for the material to enter the inside of the barrel from the outside of the barrel, and the feed hopper is located in the circumference of the material discharge section.

6. The extrusion device according to claim 1, It is characterized in that The driving motor is located at the front side of the barrel, and is connected to the extrusion screw through a reduction gearbox. The driving motor is used to drive the extrusion screw to rotate around its own axis.

7. The extrusion device according to claim 1, It is characterized in that The extrusion die is arranged at the rear side of the barrel, and a screen changing component and a metering pump are arranged between the extrusion die and the barrel.

8. The extrusion device according to claim 1, It is characterized in that Each of the heating control components includes a temperature sensor and a temperature adjustment component arranged on the barrel, the temperature sensor is used to detect the temperature in the barrel, and the temperature adjustment component is used to adjust the temperature of the barrel.

9. The extrusion device according to claim 8, It is characterized in that The extrusion device also includes a controller, which is connected to the temperature sensors of each heating control component and the temperature adjustment component signals. The controller is configured to control the temperature output by the corresponding temperature adjustment component based on the detection results of each temperature sensor.

10. The extrusion device according to claim 1, It is characterized in that The surface finish of the extrusion screw is 0.2.

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