A multi-dimensional composite fan and a pair-roller granulator using the same for dedusting

Abstract

The present invention discloses a multi-dimensional composite fan and a roller granulator using the same for dust removal. The centrifugal impeller comprises a guide section mounted on a motor shaft, a composite blade section on a hub, flexible and retractable guide vanes, and an outlet blade between an upper and lower impeller cover, arranged sequentially along the flow path. The upper impeller cover comprises a buffer chamber section and an upper impeller cover outlet section connected sequentially. The buffer chamber section includes an axial buffer inlet, a buffer chamber, and a composite blade-side buffer outlet. The composite blade section comprises a first blade mounted on the hub, a blade ring fixedly connected to the outside of the first blade, and a second blade mounted on the outside of the blade ring. The tip of the second blade is located within the buffer chamber, stabilizing airflow and pressure, reducing impeller imbalance losses, and the guide section facilitates turbulence suppression and resonance control.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, specifically to a fan, and more specifically to a multi-dimensional composite fan and a roller granulator using the same for dust removal. Background Technology

[0002] In existing fluid machinery, fans, when used under special conditions such as in dust removal equipment, may experience problems such as long-term wear leading to impeller imbalance; dust accumulation causing blockages that affect airflow and pressure, increasing energy consumption; and severe blade corrosion generating noise. Traditional fans perform poorly in complex operating conditions, limiting their application range, especially in the dust removal process of roller granulators. As a core component of the conveying system, its performance directly affects granulation quality and efficiency, leading to issues such as insufficient flow control accuracy, conveying difficulties, leakage and contamination, maintenance, and lifespan. Therefore, developing a multi-dimensional composite fan for use in roller granulators to solve these problems is particularly important.

[0003] Existing technology CN102720698A discloses a fan, in which multiple blades 7 are arranged in a ring between a front cover plate 5 and a rear cover plate 6. The blades 7 are vertically arranged between the front cover plate 5 and the rear cover plate 6; the blades 7 are welded to the front cover plate 5 and the rear cover plate 6; the blades 7 are arc-shaped; the extension line connecting the outer center and the inner center of the blade 7 passes through the center of the front cover plate 5 and the rear cover plate 6. During the fan's gas exhaust process, no airflow deviation occurs, avoiding exhaust losses. It also reduces the probability of gas turbulence or eddies caused by external interference, preventing fatigue cracks or resonance in the impeller blades, and further preventing blade breakage. This reduces fan downtime for maintenance and increases exhaust efficiency.

[0004] The prior art CN119528624A discloses a clean production process for blended fertilizer. The bottom end of the blower ball 11 has an installation part 41 for extending into the silo 1. A fan 42 is installed in the installation part 41, and the air outlet direction of the fan 42 is towards the blower ball 11. With the further design of the fan 42, the air flow efficiency can be improved, and the ventilation effect of the blower ball 11 can be improved. The bottom end of the installation part 41 is an air exchange port, and a cloth bag 12 is installed at the air exchange port. The cloth bag 12 is used to block and suppress the discharge of dust in the silo 2, effectively preventing dust pollution. In addition, a vertical rod 43 is installed on the fan 42. The bottom end of the rod 43 abuts against the cloth bag 12. The vibration generated by the fan 42 when it is working can be transmitted to the cloth bag 12 through the rod 43, causing the cloth bag 12 to shake, so that the dust adhering to the cloth bag 12 can be shaken off, avoiding the cloth bag 12 from being blocked and affecting the ventilation effect, thus realizing automatic unblocking of the cloth bag 12.

[0005] The aforementioned existing technologies all involve the application of related fans. However, the above structures have design limitations, and in the actual application of the fans, there are still problems such as instability, vibration and noise. Therefore, in order to address these problems, the applicant proposes a multi-dimensional composite fan and a roller granulator using it for dust removal. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-dimensional composite fan and a roller granulator using the same for dust removal.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A multi-dimensional composite fan includes a volute, a variable frequency motor, and a multi-dimensional composite centrifugal impeller. The centrifugal impeller includes an upper impeller cover, a lower impeller cover, and a hub. The variable frequency motor is located at the rear end of the volute, and the centrifugal impeller is disposed inside the volute. The variable frequency motor is connected to the centrifugal impeller hub via a motor shaft. The centrifugal impeller further includes a guide section mounted on the motor shaft, a composite blade section on the hub, a flexible retractable guide vane, and an outlet blade between the upper and lower impeller covers, arranged sequentially along the flow path. The upper impeller cover includes a buffer chamber section and an upper impeller cover outlet section connected sequentially. The buffer chamber section includes an axial buffer inlet, a buffer chamber, and a composite blade-side buffer outlet. The composite blade section includes a first blade mounted on the hub, a blade ring fixedly connected to the outside of the first blade, and a second blade mounted on the outside of the blade ring. The tip of the second blade is located within the buffer chamber, and the root is located within the main flow channel. A flow gap exists between the blade ring and the upper impeller cover. The flexible retractable guide vane can extend, retract, and bend within the flow channel between the composite blade section and the outlet blade to change the position and structural dimensions of the flexible retractable guide vane.

[0009] Furthermore, it also includes a control unit and a position sensor, wherein the position sensor monitors in real time the position information of the flexible telescopic guide vane relative to a predetermined reference position and the blade structure size information; the control unit adjusts the position and structure size of the flexible telescopic guide vane in real time according to the real-time operating conditions of the variable frequency motor and the feedback signal of the position sensor to optimize the flow guiding performance.

[0010] Furthermore, the flexible, retractable guide vanes are made of carbon fiber reinforced composite materials or shape memory alloy materials.

[0011] Furthermore, the impeller inlet radius is R, and the flow clearance size is (0.05~0.2)R.

[0012] Furthermore, in the cross-sectional view of the central axis of the second blade, the cross-sectional length of the second blade in the buffer cavity is 6 to 10 times the cross-sectional length in the main channel.

[0013] Furthermore, the buffer cavity has a fan-shaped or rectangular structure.

[0014] Furthermore, the flow guide section adopts a double flow guide ring structure, which includes a first flow guide ring fixedly connected to the motor shaft, a second flow guide ring, and a connecting blade connecting the first flow guide ring and fixing the second flow guide ring, wherein the connecting blade is a backward-inclined blade.

[0015] Furthermore, the first inlet ring includes a horizontal inlet ring segment and a first inclined ring segment, with the centerline of the horizontal inlet ring segment being collinear with the centerline of the motor shaft.

[0016] Furthermore, the second drainage ring includes a vertical inlet ring segment and a second inclined ring segment, with the plane of the vertical inlet ring segment being perpendicular to the centerline of the motor shaft.

[0017] Furthermore, the first inclined ring segment and the second inclined ring segment are parallel to each other in space, and the distance between them is H = (0.2~0.5)R, where R is the impeller inlet radius.

[0018] Furthermore, the angle A between the first inclined ring segment, the second inclined ring segment and the center line of the motor shaft is 30° to 60°.

[0019] A roller granulator includes a frame, a hopper mounted on the frame, and a pair of granulating rollers located below the hopper. The granulating rollers are rotatably connected to the frame and driven by a drive device. The granulator is characterized by further including a dust removal system, which comprises a fan, a dust collection hood, a dust collection box, and a filter device. The dust collection hood is positioned above and on both sides of the granulating rollers and is connected to the fan's air inlet via a pipe. The fan's air outlet is connected to the dust collection box, which contains a filter structure. The fan is a multi-dimensional composite fan.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. In existing technologies, conventional fans, under special operating conditions such as their use in dust removal equipment, experience dust accumulation leading to blockages, which in turn affects the fan's airflow and pressure, increasing energy consumption. To address this problem, this invention employs a centrifugal impeller comprising, along the flow path direction, a guide section mounted on the motor shaft, a composite blade section on the hub, flexible and retractable guide vanes, and an outlet blade between an upper impeller cover and a lower impeller cover; the upper impeller cover comprises a buffer chamber section and an upper impeller cover outlet section connected in sequence, the buffer chamber section comprising an axial buffer inlet, a buffer chamber, and a composite blade-side buffer outlet; the composite blade section comprises a first blade mounted on the hub, a blade ring fixedly connected to the outside of the first blade, and a second blade mounted on the outside of the blade ring. The impeller has two blades, with the tip of the second blade located in the buffer chamber and the root located in the main flow channel. There is a flow gap between the blade ring and the upper impeller cover. In the cross-sectional view of the central axis of the second blade, the cross-sectional length of the second blade in the buffer chamber is 6 to 10 times the cross-sectional length in the main flow channel. The impeller inlet radius is R, and the flow gap size is (0.05 to 0.2)R. The buffer chamber effectively maintains the stability of the inlet flow of the fan, eliminates the inlet eddy phenomenon, steadily improves the uniformity of the inlet airflow velocity distribution, reduces the loss of pressure fluctuations, and avoids the fan from surging due to sudden changes in airflow. The position and gap of the second blade further improve the inlet flow efficiency and inlet flow stability.

[0022] 2. To address the issue of impeller imbalance caused by long-term wear in wind turbines, this invention employs flexible, retractable guide vanes that can extend and bend within the flow channel between the composite blade section and the outflow blades. This changes the position and structural dimensions of the flexible, retractable guide vanes to balance the impeller. Specifically, a control unit and a position sensor are used. The position sensor monitors the position and blade structural dimensions of the flexible, retractable guide vanes relative to a predetermined reference position in real time. The control unit adjusts the position and structural dimensions of the flexible, retractable guide vanes in real time based on the real-time operating conditions of the variable frequency motor and the feedback signal from the position sensor to optimize the flow guidance performance. The flexible, retractable guide vanes are made of carbon fiber reinforced composite material or shape memory alloy. This structure, through the dual effects of airflow regulation and mechanical protection, sets the impeller to an active dynamic balancing system, effectively maintaining airflow symmetry, reducing the fluctuation amplitude of radial and axial forces in the impeller, and minimizing aerodynamic imbalance.

[0023] 3. To reduce the impact of dust corrosion and other factors on the noise directly generated by the impeller, this invention optimizes the inlet flow path and sets up a guide section, including a first guide ring, a second guide ring, and connecting blades that connect the first guide ring and fix the second guide ring, wherein the connecting blades are backward-inclined blades; the first guide ring includes a horizontal inlet ring section and a first inclined ring section, the axis of the horizontal inlet ring section being collinear with the axis of the motor shaft; the second guide ring includes a vertical inlet ring section and a second inclined ring section, the plane of the vertical inlet ring section being perpendicular to the axis of the motor shaft; the first inclined ring section and the second inclined ring section are parallel to each other in space, and the distance between them is H = (0.2~0.5)R, where R is the impeller inlet radius; the angle A between the first inclined ring section, the second inclined ring section and the axis of the motor shaft is 30°~60°. The arrangement of the first and second guide rings organizes and optimizes the inlet airflow within the pre-defined flow channel, effectively maintaining the inlet flow pattern. The backward-curved blades also reduce impact losses, improve energy conversion efficiency, and effectively control vibration and noise. The mutual structure between the first and second inclined ring sections directly affects the efficiency and stability of the fan inlet. This invention focuses on optimizing the correlation and fusion dimensions and structure between the first and second inclined ring sections, which is beneficial for turbulence suppression and resonance control. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a wind turbine structure based on existing technology.

[0025] Figure 2 This is a schematic diagram of a conventional double-roller granulator.

[0026] Figure 3 This is a schematic diagram of the radial cross-section of the wind turbine impeller of the present invention;

[0027] Figure 4 This is a schematic diagram of the flexible retractable guide vane of the present invention in one of its operating states;

[0028] Figure 5 This is a schematic diagram of the flexible, retractable guide vane of the present invention in another operating state.

[0029] In the diagram: 1. Upper wheel cover; 2. Lower wheel cover; 3. Motor shaft; 4. Hub; 5. Guide section; 6. Composite blade section; 7. Flexible retractable guide vane; 8. Outflow blade; 9. Variable frequency motor; 10. Control unit; 13. Position sensor; 11. Buffer chamber section; 12. Upper wheel cover outlet section; 111. Axial buffer inlet; 112. Buffer chamber; 113. Composite blade side buffer outlet; 51. First guide ring; 52. Connecting blade; 53. Second guide ring; 61. First blade; 62. Blade ring; 63. Second blade; R. Impeller inlet radius; H. Distance between the first inclined ring section and the second inclined ring section; A. Angle A between the first inclined ring section, the second inclined ring section and the motor shaft axis. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings.

[0032] like Figure 1-5 As shown, a multi-dimensional composite fan includes a volute, a variable frequency motor 9, and a multi-dimensional composite centrifugal impeller. The centrifugal impeller includes an upper impeller cover 1, a lower impeller cover 2, and a hub 4. The variable frequency motor 9 is located at the rear end of the volute, and the centrifugal impeller is disposed inside the volute. The variable frequency motor 9 is connected to the centrifugal impeller hub 4 via a motor shaft 3. The centrifugal impeller further includes a guide section 5 mounted on the motor shaft 3, a composite blade section 6 and a flexible retractable guide vane 7 mounted on the hub 4, and an outlet blade 8 between the upper impeller cover 1 and the lower impeller cover 2, which are arranged sequentially along the flow path direction. The upper impeller cover 1 includes a buffer chamber section 11 and an upper impeller cover outlet section connected sequentially. 12. The buffer section 11 includes an axial buffer inlet 111, a buffer cavity 112, and a composite blade side buffer outlet 113; the composite blade section 6 includes a first blade 61 mounted on the hub 4, a blade ring 62 fixedly connected to the outside of the first blade 61, and a second blade 63 mounted on the outside of the blade ring 62, wherein the tip of the second blade 63 is located in the buffer cavity 112, the root of the blade is located in the main flow channel, and there is a flow gap between the blade ring 62 and the upper wheel cover 1; the flexible telescopic guide vane 7 can extend, retract, and bend within the flow channel between the composite blade section 6 and the outflow blade 8 to change the position and structural dimensions of the flexible telescopic guide vane 7.

[0033] Furthermore, it also includes a control unit 10 and a position sensor 13, wherein the position sensor 13 monitors in real time the position information and blade structure size information of the flexible telescopic guide vane 7 relative to a predetermined reference position; the control unit 10 adjusts the position and structure size of the flexible telescopic guide vane 7 in real time according to the real-time operating conditions of the variable frequency motor 9 and the feedback signal of the position sensor 13 to optimize the flow guiding performance.

[0034] Furthermore, the flexible and retractable guide vane 7 is made of carbon fiber reinforced composite material or shape memory alloy material.

[0035] Furthermore, the impeller inlet radius is R, and the flow clearance size is (0.05~0.2)R.

[0036] Furthermore, in the cross-sectional view of the central axis of the second blade 63, the cross-sectional length of the second blade 63 in the buffer cavity 112 is 6 to 10 times the cross-sectional length in the main channel.

[0037] Furthermore, the buffer cavity 112 has a fan-shaped or rectangular structure.

[0038] Furthermore, the flow guide 5 adopts a double flow guide ring structure, which includes a first flow guide ring 51, a second flow guide ring 53, and a connecting blade 52 that is fixedly connected to the motor shaft 3 and connects the first flow guide ring 51 and fixes the second flow guide ring 53, wherein the connecting blade 52 is a backward-inclined blade.

[0039] Furthermore, the first drainage ring 51 includes a horizontal inlet ring segment and a first inclined ring segment, with the centerline of the horizontal inlet ring segment being collinear with the centerline of the motor shaft 3.

[0040] Furthermore, the second drainage ring 53 includes a vertical inlet ring segment and a second inclined ring segment, with the plane of the vertical inlet ring segment being perpendicular to the axis of the motor shaft 3.

[0041] Furthermore, the first inclined ring segment and the second inclined ring segment are parallel to each other in space, and the distance between them is H = (0.2~0.5)R, where R is the impeller inlet radius.

[0042] Furthermore, the angle A between the first inclined ring segment, the second inclined ring segment and the axis of the motor shaft 3 is 30° to 60°.

[0043] A roller granulator includes a frame, a hopper mounted on the frame, and a pair of granulating rollers located below the hopper. The granulating rollers are rotatably connected to the frame and driven by a drive device. The granulator is characterized by further including a dust removal system, which comprises a fan, a dust collection hood, a dust collection box, and a filter device. The dust collection hood is positioned above and on both sides of the granulating rollers and is connected to the fan's air inlet via a pipe. The fan's air outlet is connected to the dust collection box, which contains a filter structure. The fan is a multi-dimensional composite fan.

[0044] In existing technologies, conventional fans, under special operating conditions such as their use in dust removal equipment, experience dust accumulation leading to blockages, which in turn affects the fan's airflow and pressure, increasing energy consumption. To address these issues, this invention employs a centrifugal impeller comprising, sequentially arranged along the flow path, a guide section mounted on the motor shaft, a composite blade section on the hub, flexible and retractable guide vanes, and an outlet blade between an upper and lower impeller cover. The upper impeller cover includes a buffer chamber section and an upper impeller cover outlet section connected in sequence. The buffer chamber section includes an axial buffer inlet, a buffer chamber, and a composite blade-side buffer outlet. The composite blade section includes a first blade mounted on the hub, a blade ring fixedly connected to the outside of the first blade, and a second blade mounted on the outside of the blade ring. The blades have a second blade tip located within the buffer chamber and a blade root located within the main flow channel. A flow clearance exists between the blade ring and the upper impeller cover. In the cross-sectional view of the second blade's central axis, the cross-sectional length of the second blade within the buffer chamber is 6 to 10 times its cross-sectional length within the main flow channel. The impeller inlet radius is R, and the flow clearance size is (0.05 to 0.2)R. The aforementioned buffer chamber effectively maintains the stability of the fan inlet flow, eliminates inlet eddies, steadily improves the uniformity of the inlet airflow velocity distribution, reduces pressure fluctuation losses, and prevents the fan from surging due to sudden airflow changes. The position and clearance of the second blade further enhance the inlet flow efficiency and stability.

[0045] To address the issue of impeller imbalance caused by long-term wear in wind turbines, this invention employs flexible, retractable guide vanes that can extend and bend within the flow channel between the composite blade section and the outflow blades. This changes the position and structural dimensions of the flexible, retractable guide vanes to balance the impeller. Specifically, a control unit and a position sensor are used. The position sensor monitors the position and blade dimensions of the flexible, retractable guide vanes relative to a predetermined reference position in real time. The control unit adjusts the position and structural dimensions of the flexible, retractable guide vanes in real time based on the real-time operating conditions of the variable frequency motor and the feedback signal from the position sensor to optimize the flow guidance performance. The flexible, retractable guide vanes are made of carbon fiber reinforced composite material or shape memory alloy. This structure, through the dual effects of airflow regulation and mechanical protection, sets the impeller to an active dynamic balancing system, effectively maintaining airflow symmetry, reducing the fluctuation amplitude of radial and axial forces on the impeller, and minimizing aerodynamic imbalance.

[0046] To reduce the impact of dust corrosion and other factors on the noise directly generated by the impeller, this invention optimizes the inlet flow path and sets up a guide section, including a first guide ring, a second guide ring, and connecting blades that connect the first guide ring and fix the second guide ring, wherein the connecting blades are backward-curved blades; the first guide ring includes a horizontal inlet ring section and a first inclined ring section, the axis of the horizontal inlet ring section being collinear with the axis of the motor shaft; the second guide ring includes a vertical inlet ring section and a second inclined ring section, the plane of the vertical inlet ring section being perpendicular to the axis of the motor shaft; the first inclined ring section and the second inclined ring section are parallel to each other in space, and the distance between them is H = (0.2~0.5)R, where R is the impeller inlet radius; the angle A between the first inclined ring section, the second inclined ring section and the axis of the motor shaft is 30°~60°. The arrangement of the first and second guide rings organizes and optimizes the inlet airflow within the pre-defined flow channel, effectively maintaining the inlet flow pattern. The backward-curved blades also reduce impact losses, improve energy conversion efficiency, and effectively control vibration and noise. The mutual structure between the first and second inclined ring sections directly affects the efficiency and stability of the fan inlet. This invention focuses on optimizing the correlation and fusion dimensions and structure between the first and second inclined ring sections, which is beneficial for turbulence suppression and resonance control.

[0047] The above embodiments are illustrative of the present invention and not intended to limit the invention. It is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-dimensional composite fan, comprising a volute, a variable frequency motor (9), and a multi-dimensional composite centrifugal impeller, wherein the centrifugal impeller comprises an upper impeller cover (1), a lower impeller cover (2), and a hub (4); the variable frequency motor (9) is provided at the rear end of the volute, the centrifugal impeller is disposed inside the volute, and the variable frequency motor (9) is connected to the centrifugal impeller hub (4) via a motor shaft (3); characterized in that: The centrifugal impeller also includes a guide section (5) mounted on the motor shaft (3), a composite blade section (6) on the hub (4), a flexible telescopic guide vane (7), and an outlet blade (8) between the upper impeller cover (1) and the lower impeller cover (2) arranged sequentially along the flow path direction; the upper impeller cover (1) includes a buffer chamber section (11) and an upper impeller cover outlet section (12) connected in sequence, the buffer chamber section (11) includes an axial buffer inlet (111), a buffer chamber (112), and a composite blade side buffer outlet (113); the composite blade section (6) includes a first blade (61) mounted on the hub (4), a blade ring (62) fixedly connected to the outside of the first blade (61), and a second blade (63) mounted on the outside of the blade ring (62), wherein the tip of the second blade (63) is located in the buffer chamber (111) 2) Inside, the blade root is located in the main flow channel, and there is a flow gap between the blade ring (62) and the upper wheel cover (1); the flexible telescopic guide vane (7) can extend and bend in the flow channel between the composite blade section (6) and the outflow blade (8) to change the position and structural size of the flexible telescopic guide vane (7); it also includes a control unit (10) and a position sensor (13), wherein the position sensor (13) monitors the position information and blade structural size information of the flexible telescopic guide vane (7) relative to the predetermined reference position in real time; the control unit (10) adjusts the position and structural size of the flexible telescopic guide vane (7) in real time according to the real-time operating conditions of the variable frequency motor (9) and the feedback signal of the position sensor (13) to optimize the flow guiding performance; the flexible telescopic guide vane (7) is made of carbon fiber reinforced composite material or shape memory alloy material.

2. A multi-dimensional composite fan as claimed in claim 1, wherein, The impeller inlet radius is R, and the flow clearance dimension is (0.05~0.2)R.

3. The multi-dimensional composite fan of claim 1, wherein, In the cross-sectional view of the central axis of the second blade (63), the cross-sectional length of the second blade (63) in the buffer cavity (112) is 6 to 10 times the cross-sectional length in the main channel.

4. The multi-dimensional composite fan of claim 1, wherein, The buffer cavity (112) has a fan-shaped or rectangular structure.

5. The multi-dimensional composite fan of claim 1, wherein, The flow guide (5) adopts a double flow guide ring structure, which includes a first flow guide ring (51) fixedly connected to the motor shaft (3), a second flow guide ring (53), and a connecting blade (52) connecting the first flow guide ring (51) and fixing the second flow guide ring (53), wherein the connecting blade (52) is a backward inclined blade.

6. A multi-dimensional composite fan as claimed in claim 5, wherein, The first inlet ring (51) includes a horizontal inlet ring section and a first inclined ring section. The centerline of the horizontal inlet ring section is collinear with the centerline of the motor shaft (3).

7. A multi-dimensional composite fan as claimed in claim 6, wherein, The second inlet ring (53) includes a vertical inlet ring segment and a second inclined ring segment. The plane of the vertical inlet ring segment is perpendicular to the axis of the motor shaft (3).

8. A multi-dimensional composite fan as claimed in claim 7, wherein, The first inclined ring segment and the second inclined ring segment are parallel to each other in space, and the distance between them is H = (0.2~0.5)R, where R is the impeller inlet radius.

9. A multi-dimensional composite fan as claimed in claim 8, wherein, The angle A between the first inclined ring segment, the second inclined ring segment and the axis of the motor shaft (3) is 30° to 60°.

10. A double-roller granulator, comprising a frame, a hopper mounted on the frame, and a pair of granulating rollers located below the hopper, the granulating rollers being rotatably connected to the frame and driven by a drive device, characterized in that, It also includes a dust removal system for fans, which includes a fan, a dust collection hood, a dust collection box, and a filter device. The dust collection hood is located above and on both sides of the granulation roller. The dust collection hood is connected to the air inlet of the fan through a pipe. The air outlet of the fan is connected to the dust collection box, and a filter structure is installed inside the dust collection box. The fan is a multi-dimensional composite fan as described in any one of claims 1 to 9.

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