Planetary single-screw extruder

Abstract

The utility model relates to the technical field of plastic processing equipment discloses a kind of planetary single screw extrusion mechanism, comprising: first screw device includes first pipe fitting and first screw;The end of first pipe fitting is equipped with feed inlet, and the first screw is connected with the power source of outside;Planetary device includes planetary pipe fitting, screw rod and roller;Screw rod is arranged in planetary pipe fitting, and screw rod is drivingly connected with first screw, and roller circumferential end surface is equipped with thread structure, and roller circumferential array distribution is on the circumferential surface of screw rod, and exhaust port for exhausting is equipped on planetary pipe fitting;Second screw device includes second pipe fitting and second screw, and second screw is drivingly connected with screw rod.The utility model can improve the plasticizing effect of material;Improve shear efficiency;Save drying step, reduce cost.

Description

Technical Field

[0001] This utility model relates to the technical field, and in particular to a planetary single-screw extrusion mechanism. Background Technology

[0002] In many industrial fields such as plastics processing and rubber molding, extrusion molding is a crucial and widely used processing technology. Traditional extrusion machines are mainly single-screw extruders and twin-screw extruders.

[0003] Single-screw extruders offer significant advantages such as relatively simple structure, convenient operation, and low cost. Material is propelled forward along the screw channels by the screw, gradually melting and plasticizing under the influence of barrel heating and shear force between the screw and barrel, ultimately being extruded through the die head. However, single-screw extruders have significant shortcomings in material mixing and homogenization. Due to the relatively simple screw structure, material transport relies primarily on the propulsion of the screw channels, lacking an effective stirring and mixing mechanism, resulting in lower plasticization efficiency. Furthermore, some materials contain moisture before plasticization and require drying; direct use leads to moisture vaporization, causing a decline in material properties.

[0004] Therefore, improvements are needed. Utility Model Content

[0005] The technical problem solved by this utility model is to address the deficiencies in the prior art by providing a planetary single-screw extrusion mechanism to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a planetary single-screw extrusion mechanism, comprising: a first screw device, the first screw device including a first tube and a first screw disposed within the first tube; the end of the first tube is provided with a feed port, and the first screw is connected to an external power source; a planetary device, the planetary device including a planetary tube, a lead screw, and rollers; the lead screw is disposed within the planetary tube, the lead screw is drivenly connected to the first screw, the rollers are one or more, the circumferential end face of the rollers is provided with a threaded structure, the rollers are circumferentially arrayed on the circumferential surface of the lead screw, the rollers mesh with the lead screw, and the rollers are driven by the lead screw; the planetary tube is provided with an exhaust port for exhaust; a second screw device, the second screw device including a second tube and a second screw disposed within the second tube, the second screw being drivenly connected to the lead screw.

[0007] Furthermore, the number of rollers is 9, and the rollers are evenly distributed on the circumferential surface of the lead screw.

[0008] Furthermore, the first screw includes a threaded section and a feeding section, and the outer circumferential surface of the threaded section is provided with a threaded structure; the feeding section is provided with axial grooves on the circumferential surface of the first screw, and the grooves are distributed in a circumferential array on the circumferential surface of the first screw.

[0009] Furthermore, the power source includes a permanent magnet motor and a reducer connected to the output end of the permanent magnet motor, and the reducer is connected to the first screw drive.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] Enhanced material mixing and homogenization capabilities: The planetary single-screw extrusion mechanism of this utility model is equipped with a planetary device. The rollers in the planetary device are distributed in a circumferential array on the circumferential surface of the screw and mesh with the screw. Driven by the screw, the special structure of the rollers can more fully stir and mix the material, effectively improving the mixing and homogenization capabilities of the material.

[0012] Improved material plasticization effect: This utility model uses a planetary device to fully stir and mix the material, so that the material can be more evenly heated by the barrel and subjected to the shear force between the screw and the barrel during the conveying process, thereby improving the plasticization effect of the material.

[0013] Reducing the drying process: Traditional single-screw extruders require an additional drying step when processing materials containing moisture. This not only increases production time and equipment costs but may also affect product quality due to insufficient drying. This invention reduces reliance on pre-drying of materials by discharging the gas generated from moisture vaporization through the exhaust port, thereby lowering production costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the first screw assembly.

[0016] Figure 3 This is a schematic diagram of the exploded structure of the first screw assembly.

[0017] Figure 4 This is a schematic diagram of the explosion structure of a planetary device.

[0018] Figure 5 This is a schematic diagram of the exploded structure of the second screw device.

[0019] Figure 6 This is a schematic diagram of the first screw.

[0020] Figure 7 This is a partially enlarged structural diagram of the first screw.

[0021] Reference numerals: 1. First screw assembly; 2. First fitting; 3. First screw; 4. Feed inlet; 5. Planetary assembly; 6. Planetary fitting; 7. Lead screw; 8. Roller; 9. Exhaust port; 10. Second screw assembly; 11. Second fitting; 12. Second screw; 13. Threaded section; 14. Feeding section; 15. Groove; 16. Reducer. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of a second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In view of the technical problems described in the background art, such as Figure 1-7 As shown, a planetary single-screw extrusion mechanism is provided, comprising: a first screw 3 device 1, the first screw 3 device 1 including a first tube 2 and a first screw 3 disposed within the first tube 2; the end of the first tube 2 is provided with a feed port 4, and the first screw 3 is connected to an external power source; a planetary device 5, the planetary device 5 including a planetary tube 6, a lead screw 7 and rollers 8; the lead screw 7 is disposed within the planetary tube 6, the lead screw 7 is drivenly connected to the first screw 3, there is one or more rollers 8, the circumferential end face of the rollers 8 is provided with a threaded structure, the rollers 8 are circumferentially arrayed on the circumferential surface of the lead screw 7, the rollers 8 mesh with the lead screw 7, and the rollers 8 are driven by the lead screw 7; the planetary tube 6 is provided with an exhaust port 9 for exhaust; and a second screw 12 device 10, the second screw 12 device 10 including a second tube 11 and a second screw 12 disposed within the second tube 11, the second screw 12 being drivenly connected to the lead screw 7.

[0025] The planetary single-screw extrusion mechanism of this invention mainly consists of three parts: the first screw 3 (device 1), the planetary device 5, and the second screw 12 (device 10). These parts work together through transmission connections to achieve the extrusion molding of materials, and offer significant advantages in material mixing, homogenization, and plasticization.

[0026] In the above technical solution, the first pipe 2 is cylindrical, and its end is provided with a feed port 4 for introducing the material to be processed into the extrusion mechanism. The first screw 3 is connected to an external power source to obtain rotational power.

[0027] Planetary tube 6 is also cylindrical and connects to the first tube 2 and the second tube 11, forming a continuous material conveying channel. The lead screw 7 is located inside the planetary tube 6 and is connected to the first screw 3 via gear transmission or other suitable transmission methods. When the first screw 3 rotates, it drives the lead screw 7 to rotate synchronously. A suitable number of rollers 8 are selected on the circumference of the lead screw 7, depending on the specific implementation. Each roller 8 has a threaded end face and meshes with the lead screw 7. This meshing method allows the rollers 8 to rotate around their own axis when the lead screw 7 rotates, enabling thorough stirring and mixing of the material passing through the planetary device 5, greatly enhancing the mixing and homogenization capabilities of the material. The planetary tube 6 is equipped with an exhaust port 9 for venting. During material processing, for some materials containing moisture, the moisture will vaporize upon heating, producing gas. If this gas is not discharged in time, it will form bubbles in the material, affecting the plasticizing effect and the quality of the final product. The exhaust port 9 allows for the timely discharge of the vaporized gas. This reduces the reliance on pre-drying of materials to some extent, thus lowering production costs.

[0028] The second screw 12 device 10 includes a second pipe 11 and a second screw 12. The second pipe 11 is connected to the planetary pipe 6, and the second screw 12 is connected to the lead screw 7 through gear transmission or other suitable transmission methods. When the lead screw 7 rotates, it will drive the second screw 12 to rotate synchronously.

[0029] Preferably, there are 9 rollers 8, which are evenly distributed on the circumferential surface of the lead screw 7. (In other embodiments, the number of rollers 8 can be adjusted according to actual needs, but uniform distribution must be ensured.)

[0030] The first screw 3 includes a threaded section 13 and a feeding section 14. The outer circumferential surface of the threaded section 13 is provided with a threaded structure. The feeding section 14 is provided with axial grooves 15 on the circumferential surface of the first screw 3. The grooves 15 are distributed in a circumferential array on the circumferential surface of the first screw 3.

[0031] As a feasible technical solution, the first screw 3 is divided into a threaded section 13 and a feeding section 14. The outer circumferential surface of the threaded section 13 has a threaded structure that propels material forward along the threaded groove during rotation. The feeding section 14 has axial grooves 15 on the circumferential surface of the first screw 3, and these grooves 15 are distributed in a circumferential array. The design of the grooves 15 helps the material enter the threaded section 13 more smoothly in the initial stage of entering the extrusion mechanism.

[0032] The power source includes a permanent magnet motor and a reducer 16 connected to the output end of the permanent magnet motor. The reducer 16 is connected to the first screw 3 in a transmission connection.

[0033] As a feasible technical solution, the power source includes a permanent magnet motor and a reducer 16 connected to the output end of the permanent magnet motor. The permanent magnet motor has advantages such as high efficiency, energy saving, and fast response speed, providing stable and powerful power to the first screw 3. The reducer 16 is used to adjust the output speed and torque of the motor to match the working requirements of the first screw 3, ensuring that the first screw 3 can rotate at a suitable speed, thereby achieving effective material conveying. The reducer 16 and the first screw 3 are connected by a coupling or other transmission components to accurately transmit power to the first screw 3.

[0034] The specific workflow is as follows: The permanent magnet motor is started, and the power is transmitted to the first screw 3 through the reducer 16, causing the first screw 3 to start rotating. The material enters the extrusion mechanism from the feed port 4 at the end of the first tube 2. Under the combined action of the threaded section 13 and the feeding section 14 of the first screw 3, the material is conveyed forward along the screw groove and enters the planetary device 5 under the action of the groove 15 of the feeding section 14. The first screw 3 drives the lead screw 7 in the planetary device 5 to rotate through the transmission, and the lead screw 7 drives the nine rollers 8 to rotate. The threaded structure of the rollers 8 fully stirs and mixes the material, so that the material is heated and subjected to shear force more evenly during the conveying process, improving the mixing, homogenization and plasticizing effect of the material. At the same time, the gas generated by the vaporization of water in the material is discharged in time through the exhaust port 9 on the planetary tube 6. The material processed by the planetary device 5 enters the second screw 12 device 10. The second screw 12 rotates under the drive of the lead screw 7, continuing to push the material forward and further plasticizing and homogenizing the material. Finally, the material is extruded through the die head.

[0035] The above does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A planetary single-screw extrusion mechanism, characterized in that, include: The first screw assembly includes a first pipe fitting and a first screw disposed inside the first pipe fitting; the end of the first pipe fitting is provided with a feed port, and the first screw is connected to an external power source; A planetary assembly includes a planetary tube, a lead screw, and rollers. The lead screw is disposed inside the planetary tube and is drivenly connected to a first screw. There is one or more rollers, each with a threaded end face. The rollers are arranged in a circumferential array on the circumferential surface of the lead screw, and the rollers mesh with the lead screw, being driven by the lead screw. The planetary tube is provided with an exhaust port for venting. The second screw assembly includes a second pipe fitting and a second screw disposed within the second pipe fitting, the second screw being connected to the lead screw drive.

2. The planetary single-screw extrusion mechanism according to claim 1, characterized in that: The number of rollers is 9, and the rollers are evenly distributed on the circumference of the lead screw.

3. The planetary single-screw extrusion mechanism according to claim 1, characterized in that: The first screw includes a threaded section and a feeding section. The outer circumferential surface of the threaded section is provided with a threaded structure. The feeding section is provided with axial grooves on the circumferential surface of the first screw. The grooves are distributed in a circumferential array on the circumferential surface of the first screw.

4. The planetary single-screw extrusion mechanism according to claim 1, characterized in that: The power source includes a permanent magnet motor and a speed reducer connected to the output end of the permanent magnet motor. The speed reducer is connected to the first screw drive.

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