Structure-improved high-torque screw extruder for granulation

Abstract

A high-torque screw extruder with an improved structure for granulation comprises a power mechanism arranged on a rack; the middle part of the screw shaft is positioned in a cavity of the screw cylinder and is provided with a spiral sheet mechanism; the screw extruder is characterized in that the screw cylinder cavity comprises a feeding section, a mixing section, a homogenizing section and a metering and discharging section which are sequentially distributed from left to right; the spiral sheet mechanism comprises a feeding section spiral sheet module, a mixing section spiral sheet module, a homogenizing section spiral sheet module and a metering and discharging section spiral sheet module which respectively correspond to areas of the feeding section, the mixing section, the homogenizing section and the metering and discharging section and are arranged on the screw shaft in a spline fit manner; the screw pitch of the feeding section spiral piece is larger than that of the mixing section spiral piece, the screw pitch of the mixing section spiral piece is larger than that of the homogenizing section spiral piece, and the screw pitch of the homogenizing section spiral piece is equal to that of the metering discharging section spiral piece. The method has the advantages that the screw torque is improved; the stable flow conveying requirement of the high-viscosity melt is met; the whole structure is modularized, and manufacturing, cleaning and maintaining are convenient.

Description

Technical Field

[0001] This utility model belongs to the technical field of screw extrusion devices, specifically relating to a high-torque screw extruder for granulation with improved structure. Background Technology

[0002] As is well known in the industry, high-torque screws are widely used in plastic modification and granulation, flame retardancy and reinforcement of engineering plastics, blending, grafting, cross-linking materials, and coloring of plastics. Furthermore, as the name suggests, high-torque screws can provide greater torque during startup and operation, meeting the process requirements of self-feeding, melting, and extrusion stages.

[0003] Due to its high molecular weight (over 1 million), ultra-high molecular weight polyethylene (UHMWPE) possesses superior properties such as excellent wear resistance, strong impact resistance, good chemical stability, excellent self-lubrication, resistance to stress cracking, resistance to high-temperature creep, shock absorption and noise reduction, hygiene and non-toxicity, good biocompatibility, and low manufacturing cost, making it widely used. However, high molecular weight also results in high melt viscosity, with a melt flow index (MFI) of essentially zero (230℃, 5kg), leading to poor flowability. This means that during screw rotation, internal friction within the fluid is greater, resulting in greater resistance to fluid flow (i.e., affecting fluid flow performance). These factors hindering fluid flow can only be compensated for by increasing the screw's torque to facilitate fluid flow and extrusion granulation. Furthermore, after granulation, it is crucial to maintain the raw material's properties to the greatest extent possible to avoid affecting subsequent use.

[0004] While publicly available Chinese patent documents contain numerous technical information regarding screw extruders, such as CN213108129B (a screw extruder), CN207607090U (a twin-screw extruder), CN209466647U (a plastic extruder screw), and CN213860627U (a plasticizing screw for a plastic extruder), etc., these patents are not limited to those mentioned above, as they do not offer any reference points to address the applicant's concerns regarding melt extrusion granulation of ultra-high molecular weight polyethylene. Therefore, exploring high-torque screw extruders is of positive significance, and the technical solution described below arose in this context. Utility Model Content

[0005] The objective of this invention is to provide a high-torque screw extruder for granulation with improved structure that helps to increase screw torque, enabling good transmission of large torque at low speeds; facilitates the smooth flow and conveying of high-viscosity melts, ensuring uniform pressure transmission and avoiding local overload and load fluctuations; and allows the screw to exhibit a good modular assembly form, facilitating manufacturing, cleaning, and maintenance, and ensuring a long service life.

[0006] The present invention achieves its objective by providing an improved high-torque screw extruder for granulation, comprising a power mechanism mounted on a frame supported on the floor during operation; a screw barrel and a screw; the screw barrel having a screw barrel cavity along its length; and the left and right ends of the screw barrel being supported on the frame during operation. A raw material inlet is provided on the upward-facing side of the left end of the screw barrel, with a feed hopper positioned corresponding to the inlet. An extrusion port is provided on the downward-facing side of the right end of the screw barrel, with an extruded material outlet positioned corresponding to the extrusion port. The left end of the screw shaft is rotatably engaged with the left end of the screw barrel and extends outside the screw barrel cavity, connecting to the power mechanism for transmission. The right end of the screw shaft is rotatably engaged with the right end of the screw barrel. The central region of the screw shaft is located within the screw barrel cavity and is equipped with a spiral blade mechanism. The screw barrel cavity comprises a feeding section, a mixing section, a homogenizing section, and a metering discharge section, sequentially distributed from left to right. The spiral blade mechanism comprises feeding section spiral blade modules, mixing section spiral blade modules, homogenizing section spiral blade modules, and metering discharge section spiral blade modules, respectively corresponding to the regions of the feeding section, mixing section, homogenizing section, and metering discharge section, and are splinedly mounted on the screw shaft. The pitch of the feeding section spiral blades in the feeding section spiral blade module is greater than the pitch of the mixing section spiral blades in the mixing section spiral blade module, and the pitch of the mixing section spiral blades is greater than the pitch of the homogenizing section spiral blades in the homogenizing section spiral blade module. The pitch of the homogenizing section spiral blades is equal to the pitch of the metering discharge section spiral blades in the metering discharge section spiral blade module.

[0007] In a specific embodiment of this utility model, the region in the middle of the screw shaft and located in the screw barrel cavity is configured as a screw spline shaft; the feeding section spiral blade is configured on the feeding section spiral blade shaft; the mixing section spiral blade is configured on the mixing section spiral blade shaft; the homogenizing section spiral blade is configured on the homogenizing section spiral blade shaft; the metering discharge section spiral blade is configured on the metering discharge section spiral blade shaft; the shaft holes of the feeding section spiral blade shaft, the mixing section spiral blade shaft, the homogenizing section spiral blade shaft, and the metering discharge section spiral blade shaft are all spline shaft holes, which are fitted onto the screw spline shaft; the outer diameter of the feeding section spiral blade shaft is smaller than the outer diameter of the mixing section spiral blade shaft, the outer diameter of the mixing section spiral blade shaft is smaller than the outer diameter of the homogenizing section spiral blade shaft, and the outer diameter of the homogenizing section spiral blade shaft is equal to the outer diameter of the metering discharge section spiral blade shaft.

[0008] In another specific embodiment of this utility model, the number of each of the feeding section spiral blade module, the mixing section spiral blade module, the homogenization section spiral blade module, and the metering discharge section spiral blade module is multiple.

[0009] In another specific embodiment of this utility model, in the homogenization segment spiral plate module, the homogenization segment spiral plate module with homogenization segment spiral plate grooves formed on the top of the homogenization segment spiral plate shell at intervals and the homogenization segment spiral plate module without homogenization segment spiral plate grooves on the top of the homogenization segment spiral plate shell are arranged alternately.

[0010] In another specific embodiment of this utility model, in the homogenization segment spiral plate module, the distance and number between each pair of adjacent homogenization segment spiral plate grooves on the homogenization segment spiral plate of the homogenization segment spiral plate module located on the left are equal to the distance and number between each pair of adjacent homogenization segment spiral plate grooves on the homogenization segment spiral plate module located on the right.

[0011] In another specific embodiment of this utility model, metering discharge section spiral blade grooves are formed at intervals on the metering discharge section spiral blades of each metering discharge section spiral blade module and at the top of the metering discharge section spiral blade shell.

[0012] In a further specific embodiment of this utility model, a left screw support shaft extends from the left end of the screw, which is rotatably supported on the left cylinder cover of the screw barrel by a left screw support bearing, and extends to the left side of the left cylinder cover to be connected to the power mechanism for transmission. A right screw support shaft extends from the right end of the screw, which is rotatably supported on the right cylinder cover of the screw barrel by a right screw support bearing.

[0013] In a further specific embodiment of this utility model, the power mechanism includes a motor and a gearbox. The motor is fixed to the left side of the gearbox in a horizontal cantilever state and is in transmission cooperation with the gearbox. The gearbox output shaft of the gearbox extends to the right outside the gearbox body and is connected to the left support shaft of the screw through a coupling.

[0014] The technical advantages of the present invention are as follows: Because the screw pitch of the feeding section spiral blade module is designed to be larger than that of the mixing section spiral blade module, and the pitch of the mixing section spiral blade is designed to be larger than that of the homogenizing section spiral blade module, and the pitch of the homogenizing section spiral blade is designed to be equal to that of the metering discharge section spiral blade module, it helps to increase the screw torque and effectively transmit large torque at low speeds. Because the feeding section spiral blade module, mixing section spiral blade module, homogenizing section spiral blade module, and metering discharge section spiral blade module have reasonable structural designs, they are conducive to meeting the requirements for smooth flow and conveying of high-viscosity melts, uniformly transmitting pressure, avoiding local overload, and preventing load fluctuations. Because the overall structure is a modular assembly, it is convenient to manufacture and maintain. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an embodiment of the present utility model;

[0016] Figure 2 for Figure 1 The diagram shows the structure of the screw.

[0017] Figure 3 for Figure 1 and Figure 2 The diagram shows the structure of the spiral blade module in the feeding section of the spiral blade mechanism.

[0018] Figure 4 for Figure 1 and Figure 2 The diagram shows the structure of the spiral blade module in the mixing section of the spiral blade mechanism.

[0019] Figure 5 for Figure 1 and Figure 2 The diagram shows a homogenization section spiral plate with a homogenization section spiral plate groove in the homogenization section spiral plate module of the spiral plate mechanism structure system shown.

[0020] Figure 6 for Figure 1 and Figure 2 The diagram shows a helical plate module in the homogenization section of the helical plate mechanism shown in the diagram, where there is no groove on the helical plate in the homogenization section.

[0021] Figure 7 for Figure 1 and Figure 2 The diagram shows a schematic of the metering and discharging section spiral vane module of the spiral vane mechanism. Detailed Implementation

[0022] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0023] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on... Figure 1 The position shown is for illustrative purposes only and should not be construed as a specific limitation on the technical solution provided by this utility model.

[0024] Please see Figure 1 The diagram shows a power mechanism 1, which, in its operational state, is mounted on a frame supported by the floor or otherwise installed on the floor of the work site. It also shows a screw barrel 2 and a screw 3. The screw barrel 2 has a screw barrel cavity 21 along its length, and its left and right ends are supported on the aforementioned frame or otherwise installed on the floor of the work site. A raw material inlet 22 is provided on the upward-facing side of the left end of the screw barrel 2, and a feeding hopper 4 is provided corresponding to the position of the raw material inlet 22. An extrusion port 23 is provided on the downward-facing side of the right end of the screw barrel 2. An extrusion material outlet 5 is provided at the position corresponding to the extrusion port 23. The left end of the screw shaft 31 of the screw 3 is rotatably engaged with the left end of the screw barrel 2 (i.e., rotatably supported on the left end of the screw barrel 2) and extends to the outside of the screw barrel cavity 21 of the screw barrel 2 and is connected to the aforementioned power mechanism 1 for transmission. The right end of the screw shaft 31 is rotatably engaged with the right end of the screw barrel 2 (i.e., rotatably supported on the right end of the screw barrel 2), and the middle region of the screw shaft 31 is located inside the aforementioned screw barrel cavity 21 and is provided with a spiral blade mechanism 32.

[0025] The key technical points of the present invention are as follows: The aforementioned screw barrel cavity 21 includes a feeding section 211, a mixing section 212, a homogenizing section 213, and a metering discharge section 214 arranged sequentially from left to right. The aforementioned spiral vane mechanism 32 includes feeding section spiral vane modules 321, mixing section spiral vane modules 322, homogenizing section spiral vane modules 323, and metering discharge section spiral vane modules 324, respectively corresponding to the areas of the aforementioned feeding section 211, mixing section 212, homogenizing section 213, and metering discharge section 214, and is splinedly mounted on the aforementioned screw shaft 31. That is, the feeding section spiral vane module 321 is located in the area of ​​the feeding section 211 of the screw shaft 31, mixing... The mixing section spiral blade module 322 is located in the mixing section 212 region of the screw shaft 31, the homogenization section spiral blade module 323 is located in the homogenization section 213 region of the screw shaft 31, and the metering discharge section spiral blade module 324 is located in the metering discharge section 214 region of the screw shaft 31. The pitch of the feeding section spiral blade 3211 of the feeding section spiral blade module 321 is greater than the pitch of the mixing section spiral blade 3221 of the mixing section spiral blade module 322, and the pitch of the mixing section spiral blade 3221 is greater than the pitch of the homogenization section spiral blade 3231 of the homogenization section spiral blade module 323. The pitch of the homogenization section spiral blade 3231 is equal to the pitch of the metering discharge section spiral blade 3241 of the metering discharge section spiral blade module 324.

[0026] Please see Figure 2 And combined Figure 1 The screw shaft 31 is configured as a screw spline shaft in the middle part and in the region located in the screw barrel cavity 21; the feeding section spiral blade 3211 is configured on the feeding section spiral blade shaft 3212; the mixing section spiral blade 3221 is configured on the mixing section spiral blade shaft 3222; the homogenizing section spiral blade 3231 is configured on the homogenizing section spiral blade shaft 3232; the metering discharge section spiral blade 3241 is configured on the metering discharge section spiral blade shaft 3242; the feeding section spiral blade shaft 3212, the mixing section spiral blade shaft 3222, and the homogenizing section spiral blade shaft 3242 are configured on the feeding section spiral blade shaft 3212, the mixing section spiral blade shaft 3222, and the homogenizing section spiral blade shaft 3242. The shaft holes of the spiral blade shaft 3232 in the homogenization section and the spiral blade shaft 3242 in the metering and discharge section are both spline shaft holes that can be matched with the screw shaft 31, which is a spline shaft. The spline shaft hole is fitted onto the aforementioned screw spline shaft, that is, fitted onto the screw shaft 31. The outer diameter of the spiral blade shaft 3212 in the feeding section is smaller than the outer diameter of the spiral blade shaft 3222 in the mixing section. The outer diameter of the spiral blade shaft 3222 in the mixing section is smaller than the outer diameter of the spiral blade shaft 3232 in the homogenization section. The outer diameter of the spiral blade shaft 3232 in the homogenization section is equal to the outer diameter of the spiral blade shaft 3242 in the metering and discharge section.

[0027] Please see Figures 3 to 7 And continue to combine Figure 1The aforementioned feeding section spiral blade module 321, mixing section spiral blade module 322, homogenization section spiral blade module 323 and metering discharge section spiral blade module 324 each have a plurality of units.

[0028] In this embodiment, the aforementioned plurality of feeding section spiral blade modules 321 consists of two identical structures. "Identical structures" here means that the pitch between adjacent feeding section spiral blades 3211 is equal and the outer diameter of the feeding section spiral blade shaft 3212 is the same. The aforementioned mixing section spiral blade modules 322 consist of three modules, each with two adjacent mixing section spiral blades 3221 having equal pitch and the outer diameter of the mixing section spiral blade shaft 3222 being equal. There are four homogenization section spiral blade modules 323 mentioned above. The pitch between each pair of adjacent homogenization section spiral blades 3231 of the four homogenization section spiral blade modules 323 is the same, and the outer diameter of the homogenization section spiral blade shaft 3232 is the same. There are three metering discharge section spiral blade modules 324 mentioned above. The pitch between each pair of adjacent metering discharge section spiral blades 3241 of the three metering discharge section spiral blade modules 324 is the same, and the outer diameter of the metering discharge section spiral blade shaft 3242 is the same. However, the applicant should clarify that the number of each of the aforementioned feeding section spiral blade module 321, mixing section spiral blade module 322, homogenizing section spiral blade module 323, and metering discharge section spiral blade module 324 is not limited by the above embodiments. For example, when the screw shaft 31 is longer, the number of each module can be increased accordingly. Or, if the length of the screw shaft 31 remains unchanged, and the feeding section spiral blade shaft 3212, mixing section spiral blade shaft 3222, homogenizing section spiral blade shaft 3232, and metering discharge section spiral blade shaft 3242 are shortened or reasonably lengthened accordingly, then the number of each of the aforementioned modules can be adaptively changed.

[0029] In the aforementioned four homogenization segment spiral plate modules 323, the homogenization segment spiral plate 3231 has homogenization segment spiral plate grooves 32311 formed at intervals on the top of the homogenization segment spiral plate shell. Figure 5 (Detailed explanation); the homogenization section spiral plate module 323, which has no homogenization section spiral plate groove 32311 on the top of the homogenization section spiral plate shell, is arranged alternately from left to right (specifically by...). Figure 1 , Figure 2 (Illustration)

[0030] In the aforementioned homogenization section spiral plate module 323, the one located on the left is... Figure 1 and Figure 2 The distance and number between each pair of adjacent homogenizing segment spiral blade grooves 32311 on the homogenizing segment spiral blade 3231 of the first (from left to right) homogenizing segment spiral blade module 323 in the shown state are the same as those of the homogenizing segment spiral blade module 323 located on the right. Figure 1 and Figure 2In the state shown, the distance and number between each pair of adjacent homogenization segment spiral blade grooves 32311 on the third (counting from left to right) homogenization segment spiral blade 3231 are equal.

[0031] In each of the aforementioned plurality of metering discharge section spiral blade modules 324, namely the three metering discharge section spiral blade modules 324, metering discharge section spiral blade grooves 32411 are formed at intervals on the aforementioned metering discharge section spiral blade 3241 and at the top of the metering discharge section spiral blade shell of the metering discharge section spiral blade 3241. Figure 7 (Details)

[0032] Since the distance between adjacent homogenizing section spiral blade grooves 32311 on the aforementioned homogenizing section spiral blade 3231 is significantly greater than the distance between adjacent metering discharge section spiral blade grooves 32411 on the aforementioned metering discharge section spiral blade 3241, the number of homogenizing section spiral blade grooves 32311 on the homogenizing section spiral blade 3231 is significantly less than the number of adjacent metering discharge section spiral blade grooves 32411 on the metering discharge section spiral blade 3241.

[0033] Based on the applicant's explanation above and in conjunction with Figures 1 to 7 As can be seen, the screw 3 of this utility model has four functional sections: a feeding section, a mixing section, a homogenizing section, and a metering discharge section. The feeding section uses a larger pitch and deeper grooves to reduce the flow resistance and shear force of high-viscosity fluids, facilitating smooth material transport. The mixing section uses a progressively decreasing pitch to improve melt compression, enhance shear force, and improve plasticizing effect. The homogenizing section introduces two to three slotted threaded blocks, spaced apart from ordinary threaded blocks. This allows the transported material to be diverted, collected, re-diverted, and re-collected, continuously changing the material interface, strengthening mixing, and relieving torque burden in stages. Corresponding to the metering discharge section 214, the metering discharge section spiral blade module 3241 adds a metering discharge section spiral blade groove 32411 on the metering discharge section spiral blade 3241, corresponding to the metering discharge section 214, thereby increasing the number of spiral teeth. This allows adjustment of the spiral angle, more even pressure transmission by the screw, reduced local overload, and improved torque capacity.

[0034] Please pay attention. Figure 1 A left screw support shaft head 311 extends from the left end of the aforementioned screw 3. The left screw support shaft head 311 is rotatably supported on the left cylinder cover 24 of the aforementioned screw cylinder 2 via a left screw support bearing 3111, and extends to the left side of the left cylinder cover 24 to be connected to the aforementioned power mechanism 1 for transmission. A right screw support shaft head 312 extends from the right end of the screw 3. The right screw support shaft head 312 is rotatably supported on the right cylinder cover 25 of the screw cylinder 2 via a right screw support bearing 3121.

[0035] The aforementioned power mechanism 1 includes a motor 11 and a gearbox 12. The motor 11 is fixed to the left side of the gearbox 12 in a horizontal cantilever state and is in transmission cooperation with the gearbox 12. The gearbox output shaft 121 of the gearbox 12 extends to the right outside the gearbox housing and is connected to the aforementioned screw left support shaft head 311 through a coupling 1211.

[0036] When the motor 11 is working, it drives the gearbox 12. The output shaft 121 of the gearbox drives the screw shaft 31 through the coupling 1211. The screw shaft 31 (i.e., the spline shaft) drives the spiral vane mechanism 32, so that the spiral vane module 321 of the feeding section, the spiral vane module 322 of the mixing section, the spiral vane module 323 of the homogenization section, and the spiral vane module 324 of the metering and discharging section of the spiral vane mechanism 32 rotate together with the screw shaft 31. Simultaneously, ultra-high molecular weight polyethylene (UHMWPE) is fed into the feed hopper 4 and enters the screw barrel cavity 21 through the material inlet 22. During the process of sequentially passing through the feeding section 211 (also called the feeding zone), the mixing section 212 (also called the mixing zone), the homogenization section 213 (also called the homogenization zone), and the metering discharge section 214 (also called the metering discharge zone), the screw blade module 321 (feeding zone), the screw blade module 322 (mixing zone), the screw blade module 323 (homogenization zone), and the screw blade module 324 (metering discharge zone) of the aforementioned screw blade mechanism 32 are used to guide the material out from the extrusion port 23 through the extrusion material outlet 5 for subsequent cooling and cutting. A preferred solution is to install a heating device and an insulation sleeve or other similar device outside the screw barrel 2 during actual use.

[0037] In summary, the technical solution provided by this utility model can improve work efficiency. Specifically, the high-torque screw can transmit a large torque at a lower speed, thus reducing energy loss due to high-speed rotation and improving mechanical transmission efficiency; enhance load-bearing capacity. Specifically, the high-torque screw can operate stably for a long time without premature wear or deformation under high-load working conditions; improve system stability. Specifically, by increasing torque transmission capacity, the high-torque screw can better cope with load fluctuations, reduce unstable factors during system operation, and ensure the smooth operation of machinery or equipment; and demonstrate better adaptability. Specifically, the high-torque screw can withstand higher output pressure, ensuring higher efficiency and reliability.

Claims

1. A structurally improved high-torque screw extruder for granulation, comprising a power mechanism (1) which is mounted on a frame supported on the ground in the operating state; a screw barrel (2) and a screw (3), wherein the screw barrel (2) forms a screw barrel cavity (21) along its length, and the left and right ends of the screw barrel (2) are supported on the frame in the operating state; a raw material inlet (22) is provided on the upward-facing side of the left end of the screw barrel (2), and a feed hopper (4) is provided at the position corresponding to the raw material inlet (22); and the screw barrel... (2) has an extrusion port (23) on the right end facing downwards, and an extrusion material outlet (5) is provided at the position corresponding to the extrusion port (23). The left end of the screw shaft (31) of the screw (3) is rotatably engaged with the left end of the screw barrel (2) and extends to the outside of the screw barrel cavity (21) of the screw barrel (2) and is connected to the power mechanism (1) for transmission. The right end of the screw shaft (31) is rotatably engaged with the right end of the screw barrel (2), and the middle region of the screw shaft (31) is located in the screw barrel cavity (21) and is provided with a spiral blade mechanism (32); characterized in that: The screw barrel cavity (21) includes a feeding section (211), a mixing section (212), a homogenization section (213), and a metering discharge section (214) arranged sequentially from left to right. The spiral vane mechanism (32) includes feeding section spiral vane modules (321), mixing section spiral vane modules (322), and homogenization section spiral vane modules (323) respectively corresponding to the areas of the feeding section (211), mixing section (212), homogenization section (213), and metering discharge section (214) and are splinedly arranged on the screw shaft (31). The feed section spiral blade module (3211) of the feed section spiral blade module (321) has a larger pitch than the mixing section spiral blade module (322) of the mixing section spiral blade module (322), and the mixing section spiral blade module (3221) has a larger pitch than the homogenization section spiral blade module (323) of the homogenization section spiral blade module (323), and the pitch of the homogenization section spiral blade module (3231) is equal to the pitch of the metering discharge section spiral blade module (324) of the metering discharge section spiral blade module (324).

2. The improved high-torque screw extruder for granulation according to claim 1, characterized in that: The screw shaft (31) is configured as a screw spline shaft in the middle part and in the area of ​​the screw barrel cavity (21); the feeding section spiral blade (3211) is configured on the feeding section spiral blade shaft (3212); the mixing section spiral blade (3221) is configured on the mixing section spiral blade shaft (3222); the homogenizing section spiral blade (3231) is configured on the homogenizing section spiral blade shaft (3232); the metering discharge section spiral blade (3241) is configured on the metering discharge section spiral blade shaft (3242); the feeding section spiral blade shaft (3212) The screw shafts of the mixing section (3222), the homogenization section (3232), and the metering discharge section (3242) are all splined shaft holes, which are fitted onto the screw splined shaft. The outer diameter of the feeding section screw shaft (3212) is smaller than that of the mixing section screw shaft (3222), the outer diameter of the mixing section screw shaft (3222) is smaller than that of the homogenization section screw shaft (3232), and the outer diameter of the homogenization section screw shaft (3232) is equal to that of the metering discharge section screw shaft (3242).

3. The structurally improved high-torque screw extruder for granulation according to claim 1, characterized in that: The number of each of the feeding section spiral blade module (321), the mixing section spiral blade module (322), the homogenization section spiral blade module (323), and the metering discharge section spiral blade module (324) is multiple.

4. The structurally improved high-torque screw extruder for granulation according to claim 3, characterized in that: In the homogenization section spiral plate module (323), the homogenization section spiral plate (3231) has a homogenization section spiral plate groove (32311) on the top of the homogenization section spiral plate shell at intervals, and the homogenization section spiral plate module (323) without a homogenization section spiral plate groove (32311) on the top of the homogenization section spiral plate shell is arranged one-to-one with each other.

5. The structurally improved high-torque screw extruder for granulation according to claim 4, characterized in that: In the homogenization segment spiral plate module (323), the distance and number between each pair of adjacent homogenization segment spiral plate grooves (32311) on the homogenization segment spiral plate (3231) of the left homogenization segment spiral plate module (323) are equal to the distance and number between each pair of adjacent homogenization segment spiral plate grooves (32311) on the homogenization segment spiral plate (3231) of the right homogenization segment spiral plate module (323).

6. The structurally improved high-torque screw extruder for granulation according to claim 3, characterized in that: In each of the metering discharge section spiral blade modules (324), metering discharge section spiral blades (3241) are provided with metering discharge section spiral blade grooves (32411) at intervals on the metering discharge section spiral blades (3241) and at the top of the metering discharge section spiral blade shell of the metering discharge section spiral blades (3241).

7. The structurally improved high-torque screw extruder for granulation according to claim 1, characterized in that: A left screw support shaft head (311) extends from the left end of the screw (3). The left screw support shaft head (311) is rotatably supported on the left cylinder cover (24) of the screw cylinder (2) via a left screw support bearing (3111) and extends to the left side of the left cylinder cover (24) to be connected to the power mechanism (1). A right screw support shaft head (312) extends from the right end of the screw (3). The right screw support shaft head (312) is rotatably supported on the right cylinder cover (25) of the screw cylinder (2) via a right screw support bearing (3121).

8. The structurally improved high-torque screw extruder for granulation according to claim 7, characterized in that: The power mechanism (1) includes a motor (11) and a gearbox (12). The motor (11) is fixed to the left side of the gearbox (12) in a horizontal cantilever state and is in transmission cooperation with the gearbox (12). The gearbox output shaft (121) of the gearbox (12) extends to the right outside the gearbox housing and is connected to the left support shaft head (311) of the screw through a coupling (1211).

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