Internal supporting structure and multi-screw stirrer

Abstract

The invention relates to an internal supporting structure and a multi-screw stirrer. An internal supporting structure comprises a fixed ring assembly and a movable ring assembly which are matched with each other, the fixed ring assembly comprises a fixed ring, and the movable ring assembly comprises a movable ring; each fixed ring structurally comprises an outer ring and a retainer, the retainer is connected with the outer ring through a plurality of connecting plates, and a first flow channel is formed between every two adjacent connecting plates; a limiting plate is further arranged between the outer ring and the retainer, a limiting plane is arranged on the end face of the limiting plate, every two adjacent fixed rings are installed in an attached mode through the corresponding limiting plane, a first through hole is formed in each limiting plane, and therefore a second flow channel is formed. A second through hole is formed in the end face of the limiting plate beside the limiting plane, so that a third flow channel is formed; a rotating pair is installed on the retainer in a matched mode. By arranging the internal supporting structure, the problem of metal generated during operation of the multi-screw stirrer can be solved, so that the quality of slurry is improved.

Description

Technical Field

[0001] The invention relates to the technical field of multi-screw mixers, in particular to an internal supporting structure and a multi-screw mixer. Background Art

[0002] Multi-screw mixers have been widely used in the lithium battery pulping process due to their variability and adaptability brought by their building block structure and excellent mixing performance. Multi-screw mixers mainly include transmission system, feeding system, extrusion system, heating and cooling system, control system, and stirring system. The stirring system is the core part of the twin-screw extruder, which mainly includes screw and barrel. The material is added to the barrel by the feeding system. The rotation of the screw in the barrel produces spiral conveying and mixing effects on the material, so that the material undergoes solid conveying, kneading, exhaust, mixing and slurry conveying and other stirring processes, and finally extruded by the head to make the finished slurry. The screw is the "heart" of the multi-screw mixer. The screw usually adopts a building block structure, including a mandrel, a screw element and a screw head. The screw element assembly is installed on the mandrel and tightened by the screw head.

[0003] In the prior art, the screw is usually supported by a cantilever structure, with the support position at the screw head, which is connected to the output shaft of the gearbox through a coupling, and the main body and tail of the screw are suspended in the barrel. When the aspect ratio of the screw is large, the viscosity of the processed material is low, or there is not enough material in the barrel, the material in the barrel is not enough to float the screw, and the screw will be flexibly deformed under the action of its own gravity and centrifugal force. When the flexural deformation of the screw is greater than the gap between the screw ridge and the inner wall of the barrel, the screw ridge and the inner wall of the barrel will be severely worn, resulting in a lot of metal impurities, thereby contaminating the lithium battery slurry. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a rationally structured internal support structure and a multi-screw mixer. By setting up the internal support structure, the metal problem generated during the operation of the multi-screw mixer can be solved, thereby improving the slurry quality.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An internal support structure comprises a fixed ring assembly and a movable ring assembly which cooperate with each other, wherein the fixed ring assembly comprises a plurality of fixed rings, and the movable ring assembly comprises a plurality of movable rings, and the movable rings correspond to the fixed rings one by one and rotate in cooperation with each other;

[0007] The structure of a single fixed ring is as follows: it includes an outer ring in the shape of an annulus, and a retainer in the shape of an annulus, the retainer and the outer ring are arranged concentrically and spaced apart, and the retainer and the outer ring are connected by a plurality of connecting plates, the connecting plates are arranged at intervals, so that a first flow channel is formed between two adjacent connecting plates for the slurry inside the cylinder to flow through;

[0008] At least one arc-shaped limiting plate is further arranged between the outer ring and the cage. A limiting plane is arranged on the end face of the limiting plate. Adjacent two fixed rings are installed in abutting contact through the limiting plane. A first through hole is formed in the limiting plane, thereby forming a second flow channel for the slurry to flow between two adjacent fixed rings.

[0009] As a further improvement of the above technical solution:

[0010] A second through hole is formed in the end face of the limiting plate beside the limiting plane, thereby forming a third flow channel. The third flow channel penetrates the flow dead zone between two adjacent fixed rings.

[0011] Rotation fit is achieved between a single fixed ring and the corresponding moving ring through a rotary pair or a friction pair.

[0012] The structure of the rotary pair is as follows: it includes an inner ring installed in cooperation with the moving ring, and an outer ring installed in cooperation with the cage. Rolling elements are installed in cooperation between the outer ring and the inner ring, thereby forming a rotational fit between the outer ring and the inner ring.

[0013] The structure of a single moving ring is as follows: it includes a sleeve fixed on the outer circumferential surface of the core shaft, and several screw strips are arranged on the outer side wall surface of the sleeve.

[0014] The thread lead angle Ф of a single screw strip is 30° - 45°.

[0015] The height H0 of a single fixed ring is in the range of 0.5 times to 1.0 times of the outer diameter D0 of the outer ring.

[0016] A spray water channel is formed inside a single fixed ring.

[0017] A multi-screw mixer includes the above internal support structure. The internal support structure is in cooperation with the inner side wall of the cylinder body of the multi-screw mixer through a fixed ring assembly, and the internal support structure is in cooperation with the outer circumferential surface of the core shaft of the multi-screw mixer through a moving ring assembly, thereby enabling the fixed ring assembly to support the stable rotation of the core shaft through the moving ring assembly.

[0018] As a further improvement of the above technical solution:

[0019] When the length-diameter ratio L / D of the internal screw of the multi-screw mixer ≤ 32, a group of internal support structures are installed in cooperation inside the cylinder body; when the length-diameter ratio L / D of the internal screw of the multi-screw mixer > 2 and < 64, two groups of internal support structures are installed in cooperation inside the cylinder body.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention has a compact and reasonable structure and is easy to operate. By arranging a fixed ring and a moving ring, the fixed fixed ring can reduce the jumping of the moving ring during rotation, reduce the winding deformation of the screw, and reduce the friction between the screw elements on the core shaft and the inner wall of the barrel, so as to reduce the metal impurities generated during the operation of the multi-screw mixer, thereby improving the quality of lithium battery slurry.

[0022] The present invention also has the following advantages:

[0023] (1) In the present invention, a limiting plate is provided, and a limiting plane is provided on the outer end surface of the limiting plate, so that the two fixed rings can be fitted together and fixed to each other, thereby preventing the fixed rings from moving.

[0024] (2) In the present invention, by providing a first flow channel formed between the outer ring, the retaining frame and two adjacent connecting plates, the slurry inside the cylinder can flow axially along the core shaft, thereby avoiding blockage in the cylinder.

[0025] (3) In the present invention, by providing a second flow channel formed on the limiting plane, the internal spaces of the two fixed rings can be connected, thereby facilitating the radial flow of the slurry inside the cylinder along the core shaft, further preventing the problem of material blockage.

[0026] (4) In the present invention, by providing a third flow channel on the limit plate, the flow dead zone between the two fixed rings can be opened up, thereby further improving the fluidity of the slurry.

[0027] (5) In the present invention, by providing the spiral strips, the dead zone of the flow field generated in the first flow channel can be broken, thereby improving the fluidity of the slurry; at the same time, the axial displacement of the inner ring in the rotating pair can be limited to prevent the rotating pair from generating axial displacement under the thrust of the screw element during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the multi-screw mixer in the present invention.

[0029] Figure 2 It is a schematic diagram of the installation of the internal support structure and the twin screw in the present invention.

[0030] Figure 3 for Figure 2 Cross-sectional view of section AA.

[0031] Figure 4 for Figure 2 Cross-sectional view of section BB.

[0032] Figure 5 Schematic diagram of the flow of slurry inside the multi-screw mixer of the present invention Figure 1 .

[0033] Figure 6 Schematic diagram of the flow of slurry inside the multi-screw mixer of the present invention Figure 2 .

[0034] Figure 7 It is a structural schematic diagram of the fixed ring assembly in the present invention.

[0035] Figure 8 It is a structural schematic diagram of the dynamic ring in the present invention.

[0036] Fig. 9 for Figure 8 main view.

[0037] Fig.10 It is a schematic diagram of the installation structure of the internal support structure and the three screws in the present invention.

[0038] Among them: 1. Fixed ring; 2. Moving ring; 3. Internal support structure; 4. Screw element; 5. Mandrel; 6. Cylinder; 7. Front support; 8. Motor; 9. Discharge port; 10. Coupling;

[0039] 101, outer ring; 102, retainer; 103, connecting plate; 104, limit plate; 105, limit plane; 106, rotary pair; 107, spray water channel; 108, first flow channel; 109, second flow channel; 110, third flow channel;

[0040] 1061, inner ring; 1062, outer ring; 1063, rolling element;

[0041] 201, sleeve; 202, spline; 203, screw thread; 204, limit ring. DETAILED DESCRIPTION

[0042] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0043] The structure and function of the present invention are as follows:

[0044] like Figure 1-Figure 10As shown in the figure, an internal support structure includes a fixed ring assembly and a moving ring assembly that cooperate with each other. The fixed ring assembly includes several fixed rings 1, and the moving ring assembly includes several moving rings 2. The moving rings 2 correspond to the fixed rings 1 one by one and are rotationally matched. The structure of a single fixed ring 1 is as follows: it includes an outer ring 101 in a circular ring shape and a cage 102 in a circular ring shape. The cage 102 is arranged concentrically and at intervals with the outer ring 101. At the same time, the cage 102 and the outer ring 101 are connected by several connecting plates 103. The connecting plates 103 are arranged at intervals, so that a first flow channel 108 through which the slurry inside the cylinder 6 flows is formed between two adjacent connecting plates 103. At least one arc-shaped limiting plate 104 is further arranged between the outer ring 101 and the cage 102. A limiting plane 105 is arranged on the end surface of the limiting plate 104. Adjacent two fixed rings 1 are installed by abutting against each other through the limiting plane 105. A first through hole is opened on the limiting plane 105, so as to form a second flow channel 109 through which the slurry flows between two adjacent fixed rings 1.

[0045] A second through hole is opened on the end surface of the limiting plate 104 beside the limiting plane 105, so as to form a third flow channel 110. The third flow channel 110 penetrates the flow dead zone between two adjacent fixed rings 1.

[0046] The internal support structure 3 of the present invention includes a fixed ring assembly and a moving ring assembly. In the present invention, the moving ring assembly includes two moving rings 2. The two moving rings 2 are used in pairs. The two moving rings 2 are respectively installed on two core shafts 5 of the multi-screw mixer and can rotate with the corresponding core shafts 5. The fixed ring assembly cooperates with the inner side wall of the cylinder 6 of the multi-screw mixer and includes two fixed rings 1. The two fixed rings 1 are used in pairs and are limited to each other to ensure that the fixed rings 1 are radially fixed and will not rotate with the moving rings 2. The fixed fixed rings 1 reduce the jumping of the moving rings 2 during rotation, thereby reducing the flexible deformation of the screw, reducing the generation of metal impurities during the operation of the screw, and further improving the quality of the slurry.

[0047] The single fixed ring 1 and the corresponding moving ring 2 are rotationally matched through a rotating pair 106 or a friction pair; among them,

[0048] The fixed ring 1 includes an outer ring 101, a cage 102, a connecting plate 103, a limiting plate 104, and a rotating pair 106;

[0049] The outer ring 101 is used to cooperate with the inner side wall surface of the cylinder 6 of the multi-screw mixer to ensure the positioning of the fixed ring 1;

[0050] The cage 102 is rotationally matched with the corresponding moving ring 2, so that the moving ring 2 can rotate relative to the fixed ring 1;

[0051] The connecting plate 103 is used to ensure and improve the structural strength of the fixed ring 1. At the same time, it can also form a disturbance to the slurry inside the cylinder 6;

[0052] The limiting plate 104 is used to realize the matching installation between the two fixed rings 1. The limiting plane 105 is arranged on the outer end surface of the limiting plate 104, so as to facilitate the fitting between the two fixed rings 1 and limit and fix them to each other, thereby preventing the fixed rings 1 from moving;

[0053] In the present invention, by providing the first flow channel 108 formed between the outer ring 101, the retainer 102 and two adjacent connecting plates 103, the slurry inside the cylinder 6 can be easily flowed along the axial direction of the core shaft 5, thereby avoiding blockage in the cylinder 6;

[0054] By providing the second flow channel 109 formed on the limiting plane 105, the internal spaces of the two fixed rings 1 can be connected, so as to facilitate the slurry inside the cylinder 6 to flow radially along the core shaft 5, and further prevent the problem of material blockage;

[0055] By providing the third flow channel 110 formed on the limiting plate 104 , the flow dead zone between the two fixed rings 1 can be opened up, thereby further improving the fluidity of the slurry.

[0056] In the present invention, by providing an internal support structure 3, the flexural deformation of the screw can be reduced, and the friction between the screw element 4 on the core shaft 5 and the inner wall of the barrel 6 can be reduced, so as to reduce the metal impurities generated during the operation of the multi-screw mixer, thereby improving the quality of lithium battery slurry.

[0057] In addition, when the slurry is transported by the screw in the barrel 6, it will be blocked by the internal support structure 3, which may easily cause slurry blockage and thus cause the screw to stop rotating. In the present invention, by arranging the first flow channel 108, the second flow channel 109, and the third flow channel 110 on the internal support structure 3, the fluidity of the slurry can be effectively improved, blockage can be prevented, and the working stability of the multi-screw mixer can be improved.

[0058] Height H of a single fixed ring 1 0 The outer diameter D of the outer ring 101 0 In the range of 0.5 to 1.0 times. Figure 2 As shown, in the present invention, a single fixed ring 1 is in a truncated cone shape, and the cone angle m of the single fixed ring 1 can be obtained by the following formula:

[0059] m=arctan(D 0 / 2-D 1 / 2) / H 0

[0060] In the above formula, D 0 Indicates the outer diameter of the corresponding outer ring 101, D 1 Indicates the outer diameter of the corresponding cage 102, D 0 and D 1 Usually determined according to screw parameters;

[0061] H 0Indicates the height of the corresponding stator 1;

[0062] From the above formula, we can see that reducing H 0 , which can reduce the cone angle m and help reduce the slurry resistance; increasing H 0 , which helps to increase the ability of the internal support structure 3 to offset the disturbance of the screw; therefore, in the present invention, the height H of a single fixed ring 1 is 0 Configuration: outer ring 101 outer diameter D 0 The best effect is achieved within the range of 0.5 to 1.0 times.

[0063] A spray water channel 107 is provided inside a single fixed ring 1, and the liquid outlet of the spray water channel 107 corresponds to the rotating pair 106. By introducing a solution into the spray water channel 107, the rotating pair 106 is cooled and lubricated. In the present invention, the spray water channel 107 is provided inside the outer ring 101, the retaining frame 102, and the connecting plate 103, and is interconnected. A plurality of liquid outlets are provided on the retaining frame 102, and correspond to the installation position of the rotating pair 106, so that the solution can cool and lubricate the rotating pair 106.

[0064] The structure of the rotating pair 106 is as follows: it includes an inner ring 1061 mounted in cooperation with the moving ring 2, and an outer ring 1062 mounted in cooperation with the retaining frame 102, and a rolling body 1063 is mounted in cooperation with the outer ring 1062 and the inner ring 1061, so that a rotational fit is formed between the outer ring 1062 and the inner ring 1061. The rotating pair 106 is mounted on the inner side of the retaining frame 102, and its outer ring 1062 is tightly matched with the inner side wall of the retaining frame 102; by setting the rotating pair 106, the vibration of the screw can be effectively reduced when rotating.

[0065] Outer diameter D of outer ring 101 0 Greater than the outer diameter D of the cage 102 1 , so that the corresponding fixed ring 1 is truncated cone-shaped. The side wall of the truncated cone-shaped fixed ring 1 forms a slope, which helps to reduce the resistance of slurry transportation, improve the fluidity of slurry, and further reduce the risk of blockage.

[0066] The structure of a single moving ring 2 is as follows: it includes a sleeve 201 fixed on the outer circumferential surface of the core shaft 5, and a plurality of screw strips 203 are arranged on the outer wall surface of the sleeve 201. The sleeve 201 is cylindrical and hollow inside, and a spline 202 is arranged on the inner wall surface, which can cooperate with the core shaft 5 to transmit torque and power; its outer wall surface is provided with screw strips 203, which can generate radial and axial conveying force on the slurry, so as to push the slurry to move axially and left and right, break the flow dead zone in the first flow channel 108 of the fixed ring 1, thereby increasing the fluidity of the slurry and preventing the slurry from being blocked.

[0067] In addition, a limit ring 204 is provided on the outer wall surface of the sleeve 201 , and the limit ring 204 is used to limit the rotation pair 106 .

[0068] The lead angle Φ of a single thread strip 203 is 30°-45°. Fig. 9 As shown, for a single moving ring 2, the thread lead angle Φ of a single threaded strip 203 on the sleeve 201 can be obtained by the following formula:

[0069]

[0070] In the above formula, Q represents the flow rate delivered when a single moving ring 2 rotates;

[0071] D b Indicates the maximum inner diameter of a single moving ring 2;

[0072] H represents the keyway depth of the spline 202, H = (D b -D s ) / 2, where D s Indicates the minimum inner diameter of a single moving ring 2. The greater the keyway depth H, the greater the conveying flow rate Q;

[0073] Ф represents the thread lead angle of a single screw thread 203;

[0074] n represents the rotation speed of a single moving ring 2;

[0075] S represents the axial distance formed by one rotation of a single screw thread 203;

[0076] π represents pi;

[0077] It can be seen from the above formula that as the thread lead angle Ф increases, a radial force component will gradually be generated, causing part of the slurry originally transported axially to be diverted radially. This is because when the thread lead angle Ф is set within the range of 30℃-45℃, the effect of transporting slurry is best.

[0078] A spline 202 is provided on the inner wall surface of the sleeve 201 , and the sleeve 201 is fixed to the core shaft 5 via the spline 202 .

[0079] like Figure 1-Figure 6 As shown, a multi-screw mixer includes the above-mentioned internal support structure 3, the internal support structure 3 cooperates with the inner side wall of the barrel 6 of the multi-screw mixer through the fixed ring assembly, and the internal support structure 3 cooperates with the outer circumferential surface of the core shaft 5 of the multi-screw mixer through the movable ring assembly, so that the fixed ring assembly supports the core shaft 5 to rotate stably through the movable ring assembly. By providing the internal support structure 3, the friction between the screw and the inner wall of the barrel 6 can be reduced during operation, thereby reducing the generation of metal impurities.

[0080] In the present invention, the multi-screw mixer includes a hollow cylinder 6, one end of which is equipped with a transmission device, and the other end is provided with a discharge port 9;

[0081] At least two screws are installed in the barrel 6. A single screw includes a core shaft 5. One end of the core shaft 5 extends out of the barrel 6 and is connected to an output end of the transmission device through a coupling 10. An array of screw elements 4 is installed on the outer circumference of the core shaft 5.

[0082] One end of the core shaft 5 is also equipped with a front support 7, which is arranged outside the cylinder 6;

[0083] The input end of the transmission device is connected to the output end of the motor 8 , and the motor 8 drives the core shaft 5 to rotate, thereby driving the screw element 4 to rotate, and then stirring the slurry inside the barrel 6 .

[0084] In addition, in the present invention, at least one set of internal support structures 3 is arranged inside the cylinder 6; Figure 1-Figure 9 As shown, two screws can be arranged inside the multi-screw mixer. In this case, a limit plate 104 is arranged on each fixed ring 1; Fig.10 As shown, three screws can be arranged inside the multi-screw mixer. At this time, two limit plates 104 are symmetrically arranged on the fixed ring 1 installed on the middle screw, and one limit plate 104 is arranged on each of the two fixed rings 1 installed on the two side screws; similarly, more than three screws can be arranged inside the multi-screw mixer. At this time, one limit plate 104 is arranged on each of the fixed rings 1 installed on the two outermost screws, and two limit plates 104 are arranged on the remaining fixed rings 1, so as to achieve coordinated installation between the fixed rings 1.

[0085] The change in the arrangement position of the internal support structure 3 will cause a change in the support formation of the screw; as the support position of the internal support structure 3 continues to move away from the screw head (the end where the front support 7 is installed), the maximum deflection of the screw segment between the internal support structure 3 and the front support 7 increases first and then decreases (not increasing all the time);

[0086] This is because the maximum deflection of the screw segment between the internal support structure 3 and the front support 7 is affected by both the arrangement span between the internal support structure 3 and the front support 7 and the span between the internal support structure 3 and the screw tail. As the arrangement position of the internal support structure 3 approaches the screw tail, the deflection distribution of the two sections of the screw before and after the internal support structure 3 changes: the span of the screw segment between the internal support structure 3 and the front support 7 increases, and the span between the internal support structure 3 and the screw head decreases. The maximum deflection of the entire screw decreases first and then increases, and reaches a minimum value at a certain position, which is defined as the optimal placement position N. pmin In the present invention, N pmin =0.75L / D-3, where L / D represents the aspect ratio of the screw;

[0087] At the best placement position N pminAfter the internal support structure 3 is placed, the maximum deflection of the screw increases with the increase of the aspect ratio L / D of the screw; therefore, when the maximum deflection exceeds the gap between the screw and the inner wall of the barrel 6, the number of internal support structures 3 can be increased to reduce the wear caused by the deflection;

[0088] That is, when the length-to-diameter ratio L / D of the internal screw of the multi-screw mixer is ≤32, a set of internal support structures are installed inside the barrel 6; when the length-to-diameter ratio L / D of the internal screw of the multi-screw mixer is greater than 2 and less than 64, two sets of internal support structures are installed inside the barrel 6.

[0089] The working process of the present invention is as follows:

[0090] The powder and liquid enter the interior of the barrel 6 through the feeding system; at the same time, the motor 8 is started and drives the two screws to rotate through the transmission device;

[0091] When the two screws rotate, the powder and liquid in the barrel 6 are stirred by the screw element 4 and transported to the discharge port 9, and discharged through the discharge port 9;

[0092] The internal support structure 3 can prevent the screw from being flexibly deformed; the first flow channel 108, the second flow channel 109, and the third flow channel 110 can improve the fluidity of the slurry inside the barrel 6 to prevent blockage.

[0093] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. An internal support structure, characterized in that: It comprises a fixed ring assembly and a movable ring assembly which cooperate with each other, wherein the fixed ring assembly comprises a plurality of fixed rings (1), and the movable ring assembly comprises a plurality of movable rings (2), and the movable rings (2) correspond to the fixed rings (1) one by one and are rotationally matched; The structure of a single fixed ring (1) is as follows: it comprises an outer ring (101) in the form of an annular ring, and a retaining frame (102) in the form of an annular ring, wherein the retaining frame (102) and the outer ring (101) are arranged concentrically and at intervals, and the retaining frame (102) and the outer ring (101) are connected via a plurality of connecting plates (103), wherein the connecting plates (103) are arranged at intervals, so that a first flow channel (108) is formed between two adjacent connecting plates (103) for the slurry inside the cylinder (6) to flow through; At least one arc-shaped limiting plate (104) is also arranged between the outer ring (101) and the retaining frame (102), and a limiting plane (105) is arranged on the end face of the limiting plate (104). Two adjacent fixed rings (1) are installed close to each other via the limiting plane (105), and a first through hole is opened on the limiting plane (105), thereby forming a second flow channel (109) for the slurry to flow between the two adjacent fixed rings (1).

2. An internal support structure according to claim 1, characterized in that: A second through hole is provided on the end surface of the limiting plate (104) next to the limiting plane (105), thereby forming a third flow channel (110), and the third flow channel (110) opens up the flow dead zone between two adjacent fixed rings (1).

3. An internal support structure according to claim 1, characterized in that: A single fixed ring (1) and a corresponding moving ring (2) are rotationally matched via a rotating pair (106) or a friction pair.

4. An internal support structure according to claim 3, characterized in that: The structure of the rotating pair (106) is as follows: it includes an inner ring (1061) installed in cooperation with the moving ring (2), and an outer ring (1062) installed in cooperation with the retaining frame (102), and a rolling body (1063) is installed between the outer ring (1062) and the inner ring (1061), so that a rotational fit is formed between the outer ring (1062) and the inner ring (1061).

5. An internal support structure according to claim 1, characterized in that: The structure of a single moving ring (2) is as follows: it comprises a sleeve (201) fixed on the outer circumferential surface of a core shaft (5), and a plurality of screw threads (203) are arranged on the outer wall surface of the sleeve (201).

6. An internal support structure according to claim 5, characterized in that: The thread lead angle Φ of a single threaded strip (203) is 30°-45°.

7. An internal support structure according to claim 1, characterized in that: The height H0 of a single fixed ring (1) is within a range of 0.5 to 1.0 times the outer diameter D0 of the outer ring (101).

8. An internal support structure according to claim 1, characterized in that: A spraying water channel (107) is provided inside the single fixed ring (1).

9. A multi-screw mixer, characterized in that: It comprises an internal support structure as described in any one of claims 1 to 8, wherein the internal support structure cooperates with the inner wall of the barrel (6) of the multi-screw mixer through a fixed ring assembly, and the internal support structure cooperates with the outer circumferential surface of the core shaft (5) of the multi-screw mixer through a moving ring assembly, so that the fixed ring assembly supports the core shaft (5) to rotate stably through the moving ring assembly.

10. A multi-screw mixer as claimed in claim 9, characterized in that: When the length-to-diameter ratio L / D of the internal screws of the multi-screw mixer is ≤32, a set of internal support structures is installed in the interior of the barrel (6); when the length-to-diameter ratio L / D of the internal screws of the multi-screw mixer is greater than 2 and less than 64, two sets of internal support structures are installed in the interior of the barrel (6).

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