Screw extruder for PP packaging tape production

Abstract

This utility model discloses a screw extruder for producing PP packaging tape, including a machine body, a barrel, a support plate, and heating components. The barrel is fixedly connected to the machine body via multiple support plates. Multiple heating components are installed on the barrel, and the heating components and support plates are spaced apart. Each heating component includes an insulation shell, which is fixedly connected to the machine body, and a cover plate is fixedly connected to the insulation shell. This utility model uses a motor-driven sleeve blade to achieve internal gas circulation, replacing an air pump and eliminating the noise and environmental degradation caused by air pump operation. By adding a shell with an elastic diaphragm, the expansion gas inside the insulation shell is automatically absorbed and returned during cooling, solving the pressure fluctuation and sealing failure problems caused by the lack of an airflow outlet in the hot air hood. The circulating gas is an internal closed airflow, eliminating the need to introduce external gas and removing the need for a filter, thus solving the cost increase problem caused by filtration. At the same time, the blades drive the airflow in both directions, improving heating uniformity and further optimizing the performance.

Description

Technical Field

[0001] This utility model relates to the field of screw extruder technology, and in particular to a screw extruder for the production of PP packaging tape. Background Technology

[0002] In the plastics processing industry, screw extruders are key equipment, and the performance of their heating systems directly affects product quality and production efficiency. Currently, most heated screw extruders on the market use a heating method where heating wires are wound around the barrel. This method directly conducts the Joule heat generated by the energized heating wires to the barrel, achieving heating and plasticizing of the raw materials. However, this heating method has the following drawbacks: the winding of the heating wires is relatively cumbersome and requires high precision. If the winding is not done properly, it can easily lead to uneven heating of the barrel, resulting in inconsistent plasticization of the raw materials and affecting the physical properties and appearance quality of the products. To solve the above problems, some technologies use hot air heating. For example, Chinese utility model patent CN221717790U discloses a hot air circulating screw extruder, which uses an air pump to deliver hot air generated by the heating wires through pipelines to a hot air hood. The hot air forms a circulating airflow within the hot air hood through air guides, heating the barrel by convection to improve heating uniformity.

[0003] However, this type of hot air circulating screw extruder still has some shortcomings that need improvement: 1. The hot air hood usually lacks a dedicated airflow outlet. Long-term circulation of hot air inside the hood can easily cause pressure fluctuations due to gas expansion, affecting airflow stability and even causing the hot air hood seal to fail; 2. The air pump generates significant noise during operation, worsening the workshop working environment; 3. The air pump requires external gas, which contains dust and other impurities. If not treated, the dust in the gas will adhere to the heating wires and barrel, affecting heat transfer. Therefore, the gas must be filtered, which undoubtedly increases the cost of the equipment and maintenance costs. Utility Model Content

[0004] The purpose of this invention is to provide a screw extruder for the production of PP packaging tape, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a screw extruder for producing PP packaging tape, including a machine body, a barrel, a support plate, and a heating component. The barrel is fixedly connected to the machine body through multiple support plates. Multiple heating components are installed on the barrel, and the heating components and support plates are spaced apart. Each heating component includes an insulation shell, which is fixedly connected to the machine body. A cover plate is fixedly connected to the insulation shell, and a mounting frame is fixedly connected to the cover plate. A heating wire is fixedly connected to the mounting frame. A sleeve is fitted inside the mounting frame and fitted onto the barrel. Multiple first blades are evenly distributed on the outer wall of the sleeve, and the first blades are located on one side of the mounting frame. Multiple second blades are evenly distributed on the inner wall of the sleeve.

[0006] Preferably, both ends of the sleeve are hinged with mounting sleeves, and one mounting sleeve is fixedly connected to the cover plate, while the other mounting sleeve is fixedly connected to the inside of the insulation shell.

[0007] Preferably, the mounting sleeve has a plurality of second through holes evenly distributed on it.

[0008] Preferably, two retaining rings are fixedly connected to the sleeve, and the two retaining rings are respectively disposed on one side of the two mounting sleeves, with multiple protruding teeth evenly distributed on one of the retaining rings.

[0009] Preferably, both the cover plate and the insulation shell are provided with a first through hole, and a sealing sleeve is fitted inside the first through hole, and the sealing sleeve is fitted onto the machine barrel.

[0010] Preferably, a motor is fixedly connected to the insulation shell, and a worm gear is fixedly connected to the output end of the motor. The worm gear is hinged to the insulation shell and meshed with a tooth.

[0011] Preferably, a shell is fixedly connected to the heat insulation shell, a third through hole is opened on the shell, an elastic diaphragm is fixedly connected in the third through hole, and two one-way valves are conductively fixed on the shell, with the output end of one one-way valve conductively fixed on the heat insulation shell and the input end of the other one-way valve conductively fixed on the heat insulation shell.

[0012] The screw extruder for PP packaging tape production provided by this utility model has the following advantages: This utility model uses a motor-driven sleeve blade to achieve internal gas circulation, replacing the air pump and eliminating the problems of air pump operation noise and workshop environment deterioration; by adding a shell with an elastic diaphragm, it automatically absorbs the expansion gas in the heat insulation shell and returns it during cooling, solving the problems of pressure fluctuation and sealing failure caused by the lack of airflow outlet in the hot air hood; the circulating gas is an internal closed airflow, eliminating the need to introduce external gas, saving the need for a filtration device, and solving the problem of increased costs caused by filtration; at the same time, the blades promote airflow in both directions, improving heating uniformity and further optimizing the use effect. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0015] Figure 2 for Figure 1Enlarged view of the structure of region A in the middle;

[0016] Figure 3 This is a schematic diagram of the main sectional view of the heating component of this utility model;

[0017] Figure 4 for Figure 3 Enlarged view of the structure of region B in the middle;

[0018] Figure 5 This is a schematic diagram of the three-dimensional cross-sectional structure of the sleeve of this utility model.

[0019] In the diagram: 1. Body; 11. Barrel; 12. Support plate; 2. Heating assembly; 21. Insulation shell; 22. Cover plate; 23. First through hole; 24. Sealing sleeve; 25. Mounting bracket; 26. Heating wire; 27. Sleeve; 28. Retaining ring; 29. ​​Mounting sleeve; 210. Second through hole; 211. First blade; 212. Second blade; 213. Raised tooth; 214. Worm gear; 215. Motor; 216. Housing; 217. Elastic diaphragm; 218. One-way valve; 219. Third through hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Please see the appendix Figure 1 - Appendix Figure 5This utility model provides an embodiment of a screw extruder for producing PP packaging tape, comprising a machine body 1, a barrel 11, a support plate 12, and a heating assembly 2. The barrel 11 is fixedly connected to the machine body 1 via multiple support plates 12. Multiple heating assemblies 2 are installed on the barrel 11, and the heating assemblies 2 and the support plates 12 are spaced apart. Each heating assembly 2 includes a heat insulation shell 21, which is fixedly connected to the machine body 1. A cover plate 22 is fixedly connected to the heat insulation shell 21, and a mounting frame 25 is fixedly connected to the cover plate 22. A heating wire 26 is fixedly connected to the mounting frame 25, and a sleeve 27 is sleeved inside the mounting frame 25. A sleeve 27 is fitted onto the barrel 11. Multiple first blades 211 are evenly distributed on the outer wall of the sleeve 27, with the first blades 211 positioned on one side of the mounting frame 25. Multiple second blades 212 are evenly distributed on the inner wall of the sleeve 27. The barrel 11 serves as the mixing and feeding pipe for the extruder. A support plate 12 supports the barrel 11. Multiple heating components 2 provide staged heating of the barrel 11. A cover plate 22 seals the insulation shell 21, which contains the heating gas. The mounting frame 25 mounts the heating wire 26, which heats the gas. The rotating sleeve 27, through the first blades 211 and second blades 212, propels the gas through circulation. The sleeve 27 is hinged at both ends to ensure uniform heating; one mounting sleeve 29 is fixedly connected to the cover plate 22, and the other mounting sleeve 29 is fixedly connected to the insulation shell 21. The mounting sleeve 29 is used to install and support the sleeve 27; multiple second through holes 210 are evenly distributed on the mounting sleeve 29 for gas flow; two retaining rings 28 are fixedly connected to the sleeve 27, and the two retaining rings 28 are respectively set on one side of the two mounting sleeves 29. One of the retaining rings 28 has multiple protruding teeth 213 evenly distributed on it. The retaining ring 28 cooperates with the mounting sleeve 29 to limit the movement of the sleeve 27; the cover plate 22 and the insulation shell 21 are fixedly connected to the sleeve 27. Each heat insulation shell 21 has a first through hole 23, and a sealing sleeve 24 is fitted inside the first through hole 23. The sealing sleeve 24 is fitted onto the barrel 11. The first through hole 23 is used to accommodate the sealing sleeve 24. The sealing sleeve 24 is used to improve the sealing between the cover plate 22, the heat insulation shell 21 and the barrel 11. A motor 215 is fixedly connected to the heat insulation shell 21. A worm gear 214 is fixedly connected to the output end of the motor 215. The worm gear 214 is hinged to the heat insulation shell 21 and meshes with the convex tooth 213. The motor 215 is used to drive the worm gear 214. The worm gear 214 is used to drive the convex tooth 213. The convex tooth 213 drives the retaining ring 28.A housing 216 is fixedly connected to the insulation shell 21. A third through hole 219 is provided on the housing 216, and an elastic diaphragm 217 is fixedly connected within the third through hole 219. Two one-way valves 218 are conductively fixed on the housing 216, with the output end of one one-way valve 218 conductively fixed to the insulation shell 21 and the input end of the other one-way valve 218 conductively fixed to the insulation shell 21. The housing 216 is used to contain the gas discharged from the insulation shell 21 due to thermal expansion. The elastic diaphragm 217 is used to change the volume of the housing 216, and the one-way valves 218 are used to prevent low-temperature gas from flowing back into the insulation shell 21.

[0022] Working principle: When using this invention, the heating wire 26 is energized, and the motor 215 is started. The motor 215 drives the worm gear 214, which drives one of the retaining rings 28 via the tooth 213. The retaining ring 28 drives the sleeve 27, which rotates inside the mounting sleeve 29. The first blade 211 and the second blade 212 on the sleeve 27 rotate accordingly. The first blade 211 pushes the airflow towards the heating wire 26, and the second blade 212 pushes the airflow in the opposite direction. The airflow forms a circulation on the inner and outer sides of the sleeve 27, continuously heating the barrel 11. The gas expands due to heating, and the pressure inside the insulation shell 21 increases. Some of the gas passes through... Gas enters the housing 216 through the one-way valve 218, pushing the elastic diaphragm 217. The elastic diaphragm 217 in the third through hole 219 deforms, increasing the volume of gas contained in the housing 216. After the gas temperature inside the insulation shell 21 decreases, the gas pressure inside the insulation shell 21 drops, and the gas in the housing 216 enters the insulation shell 21 through another one-way valve 218. Among them, the machine body 1 is the main structure of the extruder, the support plate 12 is used to support the barrel 11, the cover plate 22 is used to seal the insulation shell 21, the mounting bracket 25 is used to install the heating wire 26, the first through hole 23 is used to accommodate the sealing sleeve 24, and the second through hole 210 is used for gas flow.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A screw extruder for producing PP packaging tape, comprising a machine body (1), a barrel (11), a support plate (12), and a heating assembly (2), characterized in that: The barrel (11) is fixedly connected to the body (1) by multiple support plates (12). Multiple heating components (2) are installed on the barrel (11), and the heating components (2) and the support plates (12) are spaced apart. The heating components (2) include a heat insulation shell (21), and the heat insulation shell (21) is fixedly connected to the body (1). A cover plate (22) is fixedly connected to the heat insulation shell (21). A mounting bracket (25) is fixedly connected to the cover plate (22). A heating wire (26) is fixedly connected to the mounting bracket (25). A sleeve (27) is sleeved inside the mounting bracket (25), and the sleeve (27) is sleeved on the barrel (11). Multiple first blades (211) are evenly distributed on the outer wall of the sleeve (27), and the first blades (211) are located on one side of the mounting bracket (25). Multiple second blades (212) are evenly distributed on the inner wall of the sleeve (27).

2. The screw extruder for PP packaging tape production according to claim 1, characterized in that: Both ends of the sleeve (27) are hinged with mounting sleeves (29), and one mounting sleeve (29) is fixedly connected to the cover plate (22), while the other mounting sleeve (29) is fixedly connected to the insulation shell (21).

3. The screw extruder for PP packaging tape production according to claim 2, characterized in that: The mounting sleeve (29) has a plurality of second through holes (210) evenly distributed on it.

4. The screw extruder for PP packaging tape production according to claim 2, characterized in that: Two retaining rings (28) are fixedly connected to the sleeve (27), and the two retaining rings (28) are respectively located on one side of the two mounting sleeves (29). One of the retaining rings (28) has multiple protruding teeth (213) evenly distributed on it.

5. The screw extruder for PP packaging tape production according to claim 2, characterized in that: Both the cover plate (22) and the heat insulation shell (21) are provided with a first through hole (23), and a sealing sleeve (24) is fitted inside the first through hole (23), and the sealing sleeve (24) is fitted onto the barrel (11).

6. The screw extruder for PP packaging tape production according to claim 5, characterized in that: A motor (215) is fixedly connected to the heat insulation shell (21), and a worm (214) is fixedly connected to the output end of the motor (215). The worm (214) is hinged to the heat insulation shell (21) and meshed with the tooth (213).

7. The screw extruder for PP packaging tape production according to claim 6, characterized in that: A housing (216) is fixedly connected to the heat insulation shell (21). A third through hole (219) is provided on the housing (216). An elastic diaphragm (217) is fixedly connected inside the third through hole (219). Two one-way valves (218) are connected and fixed on the housing (216). The output end of one of the one-way valves (218) is connected and fixed on the heat insulation shell (21), and the input end of the other one-way valve (218) is connected and fixed on the heat insulation shell (21).

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