Controllable sphere launching device based on acceleration of three friction belts

Abstract

The invention relates to the technical field of sphere launching devices, in particular to a controllable sphere launching device based on three-friction-belt acceleration, and is characterized in that the controllable sphere launching device based on three-friction-belt acceleration comprises a gantry fixing frame, and an exit port annular plate and an entrance port annular plate are arranged in the gantry fixing frame; during use, a ball can be placed in the arc-shaped ball feeding support, the ball serving angle is adjusted through the pan-tilt motor, then the ball feeding motor is started to enable the supporting plate to linearly move along the limiting guide rail for ball feeding, the brushless motor can be started to drive the friction rubber belt to rotate, and the ball is accelerated to be pushed forwards when making contact with the friction rubber belt; meanwhile, the rotating speed of each brushless motor can be independently regulated and controlled, if the rotating speeds of the three friction rubber belts are different, the ball body can rotate in the corresponding direction and amplitude, so that the rotating ball passing effect or the ball passing effect with rotation is simulated, the controllable rotating and emitting speed is achieved, various ball passing tracks are better simulated, and the ball passing effect is improved. And the actual combat simulation effect of training is improved.

Description

Technical Field

[0001] This invention relates to the field of ball launching device technology, and specifically to a controllable ball launching device based on three friction bands acceleration. Background Technology

[0002] In professional basketball training, the speed, spin, and release angle of a pass have a significant impact on an athlete's reaction ability, receiving stability, and judgment in actual combat. In order to improve training efficiency and simulate the real game environment, various basketball launching devices have emerged on the market to achieve automatic passing or spot shooting training. However, existing launching devices still have many shortcomings in terms of structure and control precision, making it difficult to meet the needs of high-level training.

[0003] Currently, common basketball launching devices mainly adopt a dual-wheel symmetrical friction structure or a pneumatic or spring-type launching mechanism. These devices use two sets of symmetrical friction wheels to clamp the ball and generate thrust to launch it. However, due to the limited precision in controlling wheel speed and friction, the spin state of the ball during the launch process is often uncontrollable, resulting in an unstable ball trajectory and a single rotation direction. In addition, traditional devices are mostly fixed-angle structures, making it difficult to flexibly adjust the launch angle and direction, and unable to effectively simulate various passing methods, such as spin passes, lob passes, and low passes.

[0004] Taking typical products on the market, such as DR.Dish and Shoot-A-Way, as examples, their core launching structure is still based on two friction wheels, and the output is mostly unidirectional rotation. Although such structures can meet basic passing training, they still have limitations in terms of spin control, angle adjustment and speed consistency, making it difficult to reproduce the complex ball trajectory characteristics and offensive and defensive rhythms in real games. To solve the above problems, we propose a controllable ball launching device based on three friction belts for acceleration. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a controllable sphere launching device based on three friction bands for acceleration, thus solving the problems mentioned in the background art.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A controllable sphere launching device based on three friction bands acceleration includes: a gantry frame, wherein an exit annular plate and an inlet annular plate are provided inside the gantry frame, and the exit annular plate and the inlet annular plate are fixedly connected together by a plurality of support rods; an adjustment assembly, wherein the adjustment assembly is disposed on the left and right sides of the gantry frame for pitch adjustment; and an acceleration assembly, wherein the acceleration assembly is disposed on the top surface of the inlet annular plate for friction acceleration.

[0007] By adopting the above technical solution, by setting adjustment components to achieve flexible adjustment of the serve angle and direction, and by setting acceleration components to accelerate the ball and control its rotation direction, various passing methods can be effectively simulated.

[0008] Preferably, the adjustment assembly includes: two side plates, which are respectively fixedly installed on the left and right sides of the gantry frame. A fixing plate is provided on one side of each side plate, and the fixing plate is fixedly connected to two adjacent support rods. A bearing is fixedly installed inside the fixing plate, and a rotating shaft is fixedly installed inside the bearing. The rotating shaft is fixedly connected to the side plate. A gimbal motor is fixedly installed inside the left side plate, and a first gear is fixedly installed at one end of the output shaft of the gimbal motor. A sector toothed plate is fixedly installed on one side of the left fixing plate, and the sector toothed plate meshes with the first gear.

[0009] By adopting the above technical solution and setting a fan-shaped toothed plate, when the gimbal motor is started, its output shaft drives the first gear to rotate. Through the meshing of the first gear and the fan-shaped toothed plate, and with the support of the rotation of the bearing, the fixed plate and the annular plate connected to it are driven to achieve angle adjustment. This design can not only achieve precise control of the launch direction, but also flexibly adjust the launch angle according to training needs, realize the switching of various passing methods such as low flat pass, straight pass and high arc pass, effectively improve the diversity of training.

[0010] Preferably, the adjustment assembly further includes: a base, the base being disposed inside the annular plate of the inlet, the base being fixedly connected to the adjacent support rod, a support plate being disposed on the top surface of the base, an arc-shaped ball delivery bracket being fixedly installed on the top surface of the support plate, and a ball being disposed inside the arc-shaped ball delivery bracket.

[0011] By adopting the above technical solution, an arc-shaped ball-feeding bracket is set up to support and position the ball. The structure of the arc-shaped ball-feeding bracket matches the shape of the ball, and can provide stable support and guidance during the placement of the ball.

[0012] Preferably, the acceleration component includes: three inner frames, all three inner frames are fixedly installed on the top surface of the inlet annular plate, the inner frames are fixedly connected to the outlet annular plate, two rollers are sleeved inside the inner frames, the two rollers are connected together by a friction rubber belt, a brushless motor is fixedly installed inside the inner frames, and the output shaft of the brushless motor is fixedly connected to the adjacent roller.

[0013] By adopting the above technical solution and setting a friction rubber belt, when the brushless motor is started, its output shaft drives the adjacent roller shaft to rotate, thereby driving the friction rubber belt to rotate. When the ball comes into contact with the friction rubber belt, it is accelerated and pushed forward, achieving controllable output of launch speed. At the same time, by independently adjusting the speed of each brushless motor, the spin direction and rotation speed of the ball can be precisely controlled. If there is a difference in the speed of the three friction rubber belts, the ball will rotate in the corresponding direction and amplitude, thereby simulating the effect of a spinning pass or a pass with rotation. If the speeds of the three friction rubber belts are equal or the difference is small, the ball's rotation amplitude is low, which can achieve a low, flat ball or a parabolic ball that is approximately straight.

[0014] Preferably, the acceleration component further includes: a limiting guide rail, the limiting guide rail being fixedly installed on the top surface of the base, a slider being fixedly installed on the bottom surface of the support plate, the slider being connected to the limiting guide rail, and two mounting plates being fixedly installed on the bottom surface of the base.

[0015] By adopting the above technical solution and setting a slider for sliding connection with the limiting guide rail, the support plate moves in a straight line along the guide rail during the ball serving process, ensuring that the ball's motion path is stable and constrained, and avoiding the impact of deviation or shaking on the ball's launching accuracy.

[0016] Preferably, the acceleration component further includes: a ball feeding motor, which is fixedly installed on one side of the mounting plate on the left side. A second gear is provided on one side of the mounting plate on the left side. The second gear is fixedly connected to the output shaft of the ball feeding motor. A rack is fixedly installed on the bottom surface of the support plate. A top hole is provided on the top surface of the base. The second gear passes through the top hole and meshes with the rack.

[0017] By adopting the above technical solution, a ball-feeding motor is set up to drive the second gear to rotate and mesh with the rack, so that the support plate moves linearly along the limiting guide rail, thereby achieving precise ball delivery. At the same time, the moving speed of the support plate can be adjusted by controlling the rotation speed of the ball-feeding motor, so as to achieve flexible control of the serving rhythm.

[0018] Preferably, the bottom surface of the base is provided with a protective plate, and the protective plate is fixedly connected to the two mounting plates.

[0019] By adopting the above technical solution and setting a protective plate to cover the mounting plate and the second gear, accidental contact with the gear or intrusion of foreign objects during operation is effectively prevented, thus protecting the safety and stability of the internal transmission mechanism.

[0020] Preferably, the three inner frames are fixedly installed between the inlet annular plate and the outlet annular plate at equal angular intervals, and the three are evenly distributed along the circumferential direction.

[0021] By adopting the above technical solution, three inner frames fixed at equal angles are used to make the force on the ball more balanced when it comes into contact with the three friction rubber strips, reducing deviation or tilting, ensuring the stability and consistency of the ball during acceleration and launch, and helping to improve the uniformity of friction, so that the ball can obtain a smooth and controllable rotation and launch speed, thereby better simulating various passing trajectories and improving the practical simulation effect of training.

[0022] In summary, the present invention has the following main beneficial effects: By setting up adjustment components, the angle and direction of the serve can be flexibly adjusted. By setting up acceleration components, the ball can be accelerated and its rotation direction controlled, effectively simulating various passing methods. By setting up a fan-shaped toothed plate, when the gimbal motor is started, its output shaft drives the first gear to rotate. Through the meshing of the first gear and the fan-shaped toothed plate, and with the support of the rotating bearing, the fixed plate and the annular plate connected to it are driven to adjust the angle. This design can not only achieve precise control of the launch direction, but also flexibly adjust the launch angle according to training needs, realizing the switching of various passing methods such as low flat pass, straight pass and high arc pass, effectively improving the diversity of training.

[0023] An arc-shaped ball-feeding bracket is used to support and position the ball. The structure of the arc-shaped ball-feeding bracket matches the shape of the ball, providing stable support and guidance during ball placement. A friction rubber belt is used. When the brushless motor is started, its output shaft drives the adjacent roller shaft to rotate, thereby driving the friction rubber belt to rotate. When the ball comes into contact with the friction rubber belt, it is accelerated forward and pushed out, achieving controllable output of launch speed. At the same time, by independently adjusting the speed of each brushless motor, the spin direction and rotation speed of the ball can be precisely controlled. If there is a difference in the speed of the three friction rubber belts, the ball will rotate in the corresponding direction and amplitude, thus simulating the effect of a spinning pass or a pass with rotation. If the speeds of the three friction rubber belts are equal or the difference is small, the ball's rotation amplitude is low, which can achieve a low, flat ball or a parabolic ball that is close to a straight line.

[0024] By setting a slider for sliding connection with the limiting guide rail, the support plate moves linearly along the guide rail during the serve, ensuring a stable and constrained ball delivery path and preventing the ball's launch accuracy from being affected by deviation or wobbling. By setting a ball delivery motor to drive the second gear to rotate and mesh with the rack, the support plate moves linearly along the limiting guide rail, thereby achieving precise ball delivery. At the same time, the movement speed of the support plate can be adjusted by controlling the speed of the ball delivery motor, allowing for flexible control of the serve rhythm.

[0025] By setting up a protective plate to cover the mounting plate and the second gear, accidental contact with the gear or intrusion of foreign objects during operation is effectively prevented, protecting the safety and stability of the internal transmission mechanism. The three inner frames fixed at equal angles are used to make the force on the ball more balanced when it comes into contact with the three friction rubber bands, reducing deviation or tilting, ensuring the stability and consistency of the ball during acceleration and launch, and helping to improve the uniformity of friction, so that the ball can obtain a smooth and controllable rotation and launch speed, thereby better simulating various passing trajectories and improving the practical simulation effect of training. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the fixing plate structure of the present invention; Figure 3 This is a schematic diagram of the base structure of the present invention; Figure 4 This is a schematic diagram of the inner frame structure of the present invention; Figure 5 This is a schematic diagram of the friction rubber belt structure of the present invention; Figure 6 This is a schematic diagram of the top hole structure of the present invention.

[0027] Reference numerals: 100, Gantry fixing frame; 200, Outlet annular plate; 300, Inlet annular plate; 400, Support rod; 500, Adjustment component; 501, Side plate; 502, Fixing plate; 503, Bearing; 504, Rotating shaft; 505, Gimbal motor; 506, First gear; 507, Sector toothed plate; 508, Base; 509, Support plate; 510, Arc-shaped ball feed bracket; 600, Acceleration component; 601, Inner frame; 602, Roller shaft; 603, Friction rubber belt; 604, Brushless motor; 605, Limiting guide rail; 606, Slider; 607, Mounting plate; 608, Ball feed motor; 609, Second gear; 610, Rack; 611, Top hole; 700, Protective plate. Detailed Implementation

[0028] 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 some embodiments of the present invention, but not all embodiments. Based on the described 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.

[0029] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0030] refer to Figures 1-6 A controllable ball launching device based on three friction bands acceleration includes: a gantry frame 100, wherein the gantry frame 100 has an exit annular plate 200 and an entrance annular plate 300 inside, the exit annular plate 200 and the entrance annular plate 300 are fixedly connected together by several support rods 400, adjustment components 500 are provided on the left and right sides of the gantry frame 100 for pitch adjustment, and an acceleration component 600 is provided on the top surface of the entrance annular plate 300 for friction acceleration. The adjustment components 500 allow for flexible adjustment of the launching angle and direction, and the acceleration component 600 accelerates the ball and controls its rotation direction, effectively simulating various passing methods. The adjustment components 500 include: two side plates 501, which are respectively fixedly installed on the left and right sides of the gantry frame 100, and a fixing plate 502 is provided on one side of each side plate 501. The fixing plate 502 is fixedly connected to two adjacent support rods 400. A bearing 503 is fixedly installed inside the plate 2. A rotating shaft 504 is fixedly installed inside the bearing 503. The rotating shaft 504 is fixedly connected to the side plate 501. A gimbal motor 505 is fixedly installed inside the left side plate 501. A first gear 506 is fixedly installed at one end of the output shaft of the gimbal motor 505. A sector toothed plate 507 is fixedly installed on one side of the left fixed plate 502. The sector toothed plate 507 meshes with the first gear 506. By setting the sector toothed plate 507, when the gimbal motor 505 is started, its output shaft drives the first gear 506 to rotate. Through the meshing of the first gear 506 and the sector toothed plate 507, and with the rotational support of the bearing 503, the fixed plate 502 and the connected inlet annular plate 300 are driven to achieve angle adjustment. This design can not only achieve precise control of the launch direction, but also flexibly adjust the launch angle according to training needs, realize the switching of various passing methods such as low flat pass, straight pass and high arc pass, effectively improve the diversity of training.

[0031] refer to Figures 1-6The adjustment component 500 further includes: a base 508, which is disposed inside the inlet annular plate 300 and fixedly connected to an adjacent support rod 400. A support plate 509 is disposed on the top surface of the base 508, and an arc-shaped ball feeder 510 is fixedly installed on the top surface of the support plate 509. A ball is disposed inside the arc-shaped ball feeder 510. The arc-shaped ball feeder 510 is used to support and position the ball. The structure of the arc-shaped ball feeder 510 matches the shape of the ball and can provide stable support and guidance during the placement of the ball. The acceleration component 600 includes: three inner frames 601, which are all fixedly installed on the top surface of the inlet annular plate 300 and fixedly connected to the outlet annular plate 200. Two rollers 602 are sleeved inside the inner frames 601 and connected by a friction rubber belt 603. Connected together, a brushless motor 604 is fixedly installed inside the inner frame 601. The output shaft of the brushless motor 604 is fixedly connected to the adjacent roller shaft 602. By setting a friction rubber belt 603, when the brushless motor 604 is started, its output shaft drives the adjacent roller shaft 602 to rotate, thereby driving the friction rubber belt 603 to rotate. When the ball comes into contact with the friction rubber belt 603, it is accelerated and pushed forward, realizing the controllable output of the launch speed. At the same time, by independently adjusting the speed of each brushless motor 604, the spin direction and rotation speed of the ball can be precisely controlled. If there is a difference in the speed of the three friction rubber belts 603, the ball will rotate in the corresponding direction and amplitude, thereby simulating the effect of a spinning pass or a pass with rotation. If the speeds of the three friction rubber belts 603 are equal or the difference is small, the ball rotates at a lower amplitude, which can realize a low flat ball or a parabolic ball with an approximate straight line.

[0032] refer to Figures 1-6The acceleration component 600 further includes: a limiting guide rail 605, which is fixedly installed on the top surface of the base 508; a slider 606 is fixedly installed on the bottom surface of the support plate 509, and the slider 606 is connected to the limiting guide rail 605; two mounting plates 607 are fixedly installed on the bottom surface of the base 508. By setting the slider 606 for sliding connection with the limiting guide rail 605, the support plate 509 moves linearly along the guide rail during the serve, ensuring a stable and constrained ball delivery path and avoiding impact on the ball's launch accuracy due to offset or shaking. The acceleration component 600 also includes: a ball delivery motor 608, which is fixedly installed on the left mounting plate 607. On one side, a second gear 609 is provided on one side of the left mounting plate 607. The second gear 609 is fixedly connected to the output shaft of the ball feeding motor 608. A rack 610 is fixedly installed on the bottom surface of the support plate 509. A top hole 611 is opened on the top surface of the base 508. The second gear 609 passes through the top hole 611 and meshes with the rack 610. By setting the ball feeding motor 608, the second gear 609 is driven to rotate and mesh with the rack 610, so that the support plate 509 moves linearly along the limit guide rail 605, thereby realizing the precise ball feeding. At the same time, the moving speed of the support plate 509 can be adjusted by controlling the rotation speed of the ball feeding motor 608, so as to realize the flexible control of the serving rhythm.

[0033] refer to Figures 1-6 The base 508 has a protective plate 700 on its bottom surface, which is fixedly connected to two mounting plates 607. The protective plate 700 covers the mounting plates 607 and the second gear 609, effectively preventing accidental contact with the gear or intrusion of foreign objects during operation, and protecting the safety and stability of the internal transmission mechanism. The three inner frames 601 are fixedly installed at equal angular intervals between the inlet annular plate 300 and the outlet annular plate 200. The three are evenly distributed along the circumference. The three inner frames 601 fixed at equal angular intervals make the force on the ball more balanced when it comes into contact with the three friction rubber bands 603, reducing deviation or tilting, ensuring the stability and consistency of the ball during acceleration and launch, and helping to improve the uniformity of friction, so that the ball can obtain a smooth and controllable rotation and launch speed, thereby better simulating various passing trajectories and improving the practical simulation effect of training.

[0034] Working principle: Please refer to Figures 1-6As shown, during use, the ball is placed inside the arc-shaped ball-feeding bracket 510, and then the gimbal motor 505 is activated to drive the first gear 506 to rotate. The first gear 506 meshes with the sector-shaped toothed plate 507, and with the support of the rotating bearing 503, the fixed plate 502 and its connected inlet annular plate 300 are driven to adjust the ball-feeding angle. After that, the ball-feeding motor 608 is activated to drive the second gear 609 to rotate and mesh with the rack 610, so that the support plate 509 moves linearly along the limit guide rail 605, thereby achieving precise ball delivery. At the same time, the speed of the ball-feeding motor 608 can be controlled to adjust the moving speed of the support plate 509, so as to flexibly control the ball-feeding rhythm. Then, the output shaft of the brushless motor 604 is activated. The adjacent rollers 602 are driven to rotate, which in turn drives the friction rubber belts 603 to rotate. When the ball comes into contact with the friction rubber belts 603, it is accelerated and pushed forward, achieving controllable output of launch speed. At the same time, by independently adjusting the speed of each brushless motor 604, the spin direction and rotation speed of the ball can be precisely controlled. If there is a difference in the speed of the three friction rubber belts 603, the ball will rotate in the corresponding direction and amplitude, thus simulating the effect of a spinning pass or a pass with spin. If the speeds of the three friction rubber belts 603 are equal or the difference is small, the ball's rotation amplitude is low, which can achieve a low, flat ball or a parabolic ball that is close to a straight line. This achieves controllable rotation and launch speed, thus better simulating various passing trajectories and improving the practical simulation effect of training.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that, unless otherwise defined, the technical or scientific terms used in this invention should be understood in the ordinary sense by those skilled in the art to which this invention pertains. Terms such as "comprising" or "including" as used in this invention mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A controllable sphere launching device based on three friction bands acceleration, characterized in that, include: A gantry fixing frame (100) is provided inside the gantry fixing frame (100) with an outlet annular plate (200) and an inlet annular plate (300). The outlet annular plate (200) and the inlet annular plate (300) are fixedly connected together by a number of support rods (400). Adjustment components (500) are disposed on the left and right sides of the gantry fixing frame (100) for pitch adjustment; An acceleration component (600) is disposed on the top surface of the inlet annular plate (300) for friction acceleration.

2. The controllable sphere launching device based on three friction bands acceleration according to claim 1, characterized in that, The adjustment component (500) includes: Two side plates (501) are fixedly installed on the left and right sides of the gantry frame (100). A fixing plate (502) is provided on one side of the side plate (501). The fixing plate (502) is fixedly connected to the two adjacent support rods (400). A bearing (503) is fixedly installed inside the fixing plate (502). A rotating shaft (504) is fixedly installed inside the bearing (503). The rotating shaft (504) is fixedly connected to the side plate (501). A gimbal motor (505) is fixedly installed inside the left side plate (501). A first gear (506) is fixedly installed at one end of the output shaft of the gimbal motor (505). A sector toothed plate (507) is fixedly installed on one side of the left fixing plate (502). The sector toothed plate (507) meshes with the first gear (506).

3. The controllable sphere launching device based on three friction bands acceleration according to claim 2, characterized in that, The adjustment assembly (500) further includes: The base (508) is disposed inside the annular plate (300) of the inlet. The base (508) is fixedly connected to the adjacent support rod (400). A support plate (509) is provided on the top surface of the base (508). An arc-shaped ball feeder (510) is fixedly installed on the top surface of the support plate (509). A ball is provided inside the arc-shaped ball feeder (510).

4. The controllable sphere launching device based on three friction bands acceleration according to claim 3, characterized in that, The acceleration component (600) includes: Three inner frames (601) are fixedly installed on the top surface of the inlet annular plate (300). The inner frames (601) are fixedly connected to the outlet annular plate (200). Two rollers (602) are sleeved inside the inner frame (601). The two rollers (602) are connected together by a friction rubber belt (603). A brushless motor (604) is fixedly installed inside the inner frame (601). The output shaft of the brushless motor (604) is fixedly connected to the adjacent roller (602).

5. A controllable sphere launching device based on three friction bands acceleration according to claim 4, characterized in that, The acceleration component (600) also includes: A limiting guide rail (605) is fixedly installed on the top surface of the base (508). A slider (606) is fixedly installed on the bottom surface of the support plate (509). The slider (606) is connected to the limiting guide rail (605). Two mounting plates (607) are fixedly installed on the bottom surface of the base (508).

6. A controllable sphere launching device based on three friction bands acceleration according to claim 5, characterized in that, The acceleration component (600) also includes: A ball-feeding motor (608) is fixedly installed on one side of the mounting plate (607) on the left side. A second gear (609) is provided on one side of the mounting plate (607) on the left side. The second gear (609) is fixedly connected to the output shaft of the ball-feeding motor (608). A rack (610) is fixedly installed on the bottom surface of the support plate (509). A top hole (611) is opened on the top surface of the base (508). The second gear (609) passes through the top hole (611) and meshes with the rack (610).

7. A controllable sphere launching device based on three friction bands acceleration according to claim 5, characterized in that, The bottom surface of the base (508) is provided with a protective plate (700), and the protective plate (700) is fixedly connected to the two mounting plates (607).

8. A controllable sphere launching device based on three friction bands acceleration according to claim 4, characterized in that, The three inner frames (601) are fixedly installed between the inlet annular plate (300) and the outlet annular plate (200) at equal angular intervals, and the three are evenly distributed along the circumferential direction.

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