Pick ball automatic serving exercise equipment

Abstract

The invention relates to the technical field of Pick ball serving devices, in particular to automatic Pick ball serving exercise equipment which comprises a first base plate, a second base plate rotationally arranged on the top face of the first base plate, a first shell and a second shell detachably arranged on the top face of the second base plate, a T-shaped pipe arranged on the top face of the second shell, and a horizontal adjusting mechanism arranged between the first base plate and the second base plate. The multi-rotation-direction pike ball launching device has the advantages that multi-rotation-direction pike ball launching simulation can be achieved, the multi-rotation-direction pike ball launching device can effectively adapt to pike ball launching of different specifications, the launching effect is more stable, a friction wheel can be cleaned, the service life of the friction wheel is prolonged, and the service life of the friction wheel is prolonged. The launching effect is effectively guaranteed, the service life of the device is prolonged, and the functional effect of the device is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of pickle ball serving devices, and in particular to a pickle ball automatic serving practice device. Background Art

[0002] Pickleball is a ball game originating in the United States, developed from the integration of table tennis, badminton, and tennis. Its rules are relatively simple and suitable for all ages. Combining the flexibility of table tennis, the speed of badminton, and the tactics of tennis, pickleball is characterized by its fast ball speed and quick reaction time, requiring high physical flexibility and agility. It is one of the fastest-growing emerging sports. Due to its close similarities to tennis, pickleball serving machines are often modified from tennis serving machines to meet the needs of daily pickleball enthusiasts in receiving and serving.

[0003] The prior art has a publication number of CN220968032U, which discloses a tennis ball serving machine, including a device housing, a top shell embedded in the device housing, a first drive motor installed on the lower wall of the top shell, a lower ball turntable installed on the output end of the first drive motor, and the lower ball turntable is located above the top shell. An adjustable automatic ball serving structure is installed on the device housing; the adjustable automatic ball serving structure includes: a chassis, a pair of movable tugwheels, two pairs of spring foot pads, a movable drag frame and an adjustable ball serving assembly, relating to the technical field of sports equipment, and has the beneficial effect of: solving the problem that the existing tennis ball serving machine equipment is large in size and can only send the ball out through a high-speed rotating drum, and cannot adjust the ball angle and strength. The adjustment of the serving angle requires manual adjustment of the device's direction, and the training effect is single, which affects the training effect.

[0004] However, the above-mentioned prior art still has certain deficiencies during use: First, the above-mentioned prior art is provided with an adjustment serving assembly, by which a pair of rotating motors and serving rollers therein are adjusted to adjust the vertical deflection angle, and different vertical deflections are used to automatically adjust the different launching heights of the pickle ball. Since the above-mentioned prior art can only deflect at a vertical angle, the two serving rollers can only simulate topspin or backspin (positive spin), and cannot simulate left and right spin, so its function is still relatively simple; secondly, the deflection of the two serving rollers in the above-mentioned prior art is an overall deflection, and the distance between the two serving rollers is fixed. The size specifications of the existing pickle balls are different. When the vertical When a pickle ball with a smaller diameter is launched, the launch force and distance are smaller, or even the pickle ball cannot be launched. When a pickle ball with a larger diameter is launched, it cannot be launched. Therefore, the structure of the above-mentioned prior art cannot adapt to the launch of pickle balls of different specifications. Finally, in real life, after the pickle ball serving machine has been used for a long time, the two friction wheels continuously rub and consume the pickle balls themselves, causing the worn parts of the pickle balls to adhere to the surface of the friction wheels over time. When the adhesion is relatively thick, the friction coefficient of the friction wheels will be reduced, which will lead to a decrease in the launch force of the pickle ball. However, the above-mentioned and even other prior arts do not have a structure for cleaning the surface of the friction wheels of the pickle balls, and further improvement is still needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a pickle ball automatic serving practice device, which can simulate serving with different spin directions, can adapt to pickle balls of different specifications, and can clean the surface of the friction wheel.

[0006] The present invention adopts the following technical solution: a pickle ball automatic serving practice device, including chassis one, chassis two is rotatably provided on the top surface of chassis one, shell one and shell two are detachably provided on the top surface of chassis two, a T-shaped tube is provided on the top surface of shell two, an arc-shaped track is provided on the inner top surface of shell two, a serving mechanism is provided on one side of the horizontal section of the arc-shaped track, the serving mechanism includes a disc, four friction wheels are vertically provided on the side surface of the disc, an annular member is rotatably provided on the outer side of the disc, two isosceles trapezoidal convex plates are symmetrically provided on the annular member, a cleaning assembly is symmetrically provided on the annular member, the connecting line of the two cleaning assemblies is perpendicular to the connecting line of the two isosceles trapezoidal convex plates, and an auxiliary assembly is provided on one side of the horizontal section of the arc-shaped track.

[0007] Preferably, a launch port is provided at the front end of the first shell, a plug-in tube with a column inserted therein is provided on the top surface of the second shell, a ball guide track is provided on the column, one end of the horizontal channel of the T-tube is in a closed state, the bottom outlet of the ball guide track is connected to the open end of the T-tube, and an intermittent feeding assembly is provided in the vertical channel of the T-tube.

[0008] Preferably, a horizontal adjustment mechanism is provided between chassis one and chassis two, and the horizontal adjustment mechanism includes a gear ring one, a cylindrical groove is provided on the top surface of chassis one, and gear ring one rotates in the cylindrical groove, and the top surface of gear ring one is fixedly connected to the bottom surface of chassis two, and gear one rotates on the bottom surface of the cylindrical groove, and gear one is engaged with gear ring one, and a stepped accommodating groove is provided on the bottom surface of chassis one, and motor one is fixedly provided in the space with a small inner diameter of the stepped accommodating groove, and the output end of motor one is fixed coaxially with the gear, and a sealing plate is fixedly provided in the space with a large inner diameter of the stepped accommodating groove.

[0009] Preferably, the ball-serving mechanism also includes a spring 1, a circular opening coaxial with the horizontal section opening of the arc track and with an inner diameter larger than the horizontal section opening is opened in the middle of the disc, four T-slots perpendicular to each other and evenly distributed on the outside of the circular opening are opened on one side of the disc, a moving part with a U-shaped connecting part on the top surface is slidably arranged in each of the four T-slots, the openings of the U-shaped connecting parts are all facing the center of the circular opening, the friction wheel rotates in the opening of the U-shaped connecting part, and a motor 2 with an output end fixedly connected to the friction wheel is provided on one side of the U-shaped connecting part, each motor 2 drives the corresponding friction wheel separately, and the spring 1 is arranged between the moving part and the T-slot. When the spring 1 is in its original length state, the friction wheels are all outside the circular opening.

[0010] Preferably, a driving module for controlling the rotation of the annular member is provided on one side of the disc, and a rectangular bar with rounded corners on the outer end is provided at the connecting end of the U-shaped connecting member. The rectangular bar and the isosceles trapezoidal convex plate are on the same plane, and the two sets of inclined surfaces parallel to each other of the two isosceles trapezoidal convex plates are respectively an inclined surface and a stepped surface, and the stepped surface has at least one step, and the rectangular bar and the isosceles trapezoidal convex plate are in sliding fit.

[0011] Preferably, the cleaning component includes a small exhaust fan and a cleaning box arranged on the top surface of the annular member, the cleaning box includes a heating chamber, a scraping chamber, a material guiding chamber, a collecting chamber and a material suction chamber, the heating chamber is located at the upper end of the cleaning box and is horizontal, a heating element is provided on the bottom surface of the heating chamber, the heating element is higher than the top surface of the friction wheel by a set distance, a rectangular opening is opened on the inner side surface of the scraping chamber, a scraper adapted to the contour of the friction wheel is rotatably provided on the lower side of the rectangular opening, and a driving component for controlling the deflection of the scraper is provided on the side of the cleaning box.

[0012] Preferably, the collecting chamber is communicated with the material guiding chamber, an inclined plate is arranged at an angle at the tail end of the material guiding chamber, the suction chamber is arranged horizontally, and the top surface of the suction chamber is lower than the bottom surface of the rectangular strip, the suction chamber and the collecting chamber are separated by a partition, a small exhaust fan is arranged in the suction chamber, and a collecting box is inserted in the collecting chamber, the collecting box is located below the inclined plate, and filter holes are correspondingly provided on the inner wall of the partition and the collecting box, and a through opening is provided on the side of the suction chamber away from the partition.

[0013] Preferably, an elevation adjustment assembly is provided between the disc and the arc track, and the elevation adjustment assembly includes a protrusion, a protrusion is fixedly provided on the top surface of the second chassis, the top of the protrusion is hingedly engaged with the bottom end of the disc, connecting plates are symmetrically fixedly provided on both sides of the arc track, and a telescopic rod 1 is hingedly provided on the side of the connecting plate facing the disc, and the movable end of the telescopic rod 1 is hingedly engaged with the side of the disc.

[0014] Preferably, the auxiliary component includes a power supply box arranged on the top surface of the second chassis, a slot with a width smaller than the diameter of the smallest size pickle ball is opened at the corner of the arc track, a limit plate is provided on the top surface of the power supply box, a sliding rod is slidingly provided on the upper end of the limit plate, a rubber top block pointing to the center of the slot is provided at the front end of the slide rod, a limiting member in a ring shape with a rectangular protrusion at the lower end is provided on the middle part of the slide rod between the limit plate and the arc track, a spring 2 is provided between the limit member and the limit plate, when the spring 2 is in the original length state, the rubber top block is just outside the slot, a telescopic rod 2 is provided at the lower end of the limit plate, a rectangular column 1 is provided on the upper side of the movable end of the telescopic rod 2 and is located on the right side of the limit member, the rectangular column 1 is higher than the rectangular protrusion at the lower end of the limit member and is wider than the rectangular protrusion.

[0015] Preferably, a slide groove consisting of a shallow groove and a deep groove is provided on the top surface of the power supply box body, and a rectangular column 2 with a slider at the bottom end is vertically slidably provided at the front end of the movable end of the telescopic rod 2, and the slider slides in the slide groove, and a spring 3 is provided between the slider and the movable end of the telescopic rod 2. When the telescopic rod 2 is in the initial state of semi-extended, the slider is in the shallow groove, the spring 3 is in a compressed state, and the rectangular column 2 is on the left side of the limit member and higher than the rectangular protrusion below the limit member. A receiving groove is provided on one side of the rectangular protrusion of the limit member, and a block is rotatably provided in the receiving groove. A notch is provided through the lower end of the receiving groove, and the vertical depth of the notch is less than the vertical depth of the receiving groove. When the slider is in the shallow groove, the upper end of the rectangular column 2 is lower than the top surface of the notch.

[0016] Compared with the prior art, this application has the following beneficial effects: 1: In the present application, a horizontal adjustment mechanism is provided between chassis 1 and chassis 2. The horizontal adjustment mechanism includes a ring gear 1, a gear 1 and a motor 1. The motor 1 drives the meshing gear 1 and the ring gear 1 to rotate, so that the chassis 2 can swing in the horizontal direction, so that the serving device can serve the ball in different horizontal directions, thereby enhancing the simulation effect of the serving device and the functional effect of the serving device, and meeting the user's ball catching training for pickleballs sent from different horizontal directions.

[0017] 2: The present application provides a ball-serving mechanism, which includes a disc with a circular opening, four independently driven friction wheels vertically and slidingly arranged on one side of the disc, a rectangular bar arranged on the outside of the friction wheel, and a ring member rotatably arranged on the outside of the disc. Two isosceles trapezoidal convex plates are symmetrically arranged on the ring member, and the two isosceles trapezoidal convex plates are driven to rotate by the rotating ring member, so that the side surfaces of the isosceles trapezoidal convex plates push the two relatively arranged rectangular bars, and the two relatively arranged friction wheels can be moved toward the middle, thereby adjusting the distance between the two relatively friction wheels to adapt to different sizes of pickle balls, which can ensure the stability when launching pickle balls of different sizes and enhance the serving stability of the ball-serving device.

[0018] 3: The mid-waist trapezoidal convex plate of the present application can simulate topspin and backspin when combined with two vertically arranged friction wheels, and can simulate left-handed and right-handed balls when combined with two horizontally arranged friction wheels. Alternating combinations can achieve the selection of serves with different spin directions, thereby enhancing the functionality of the serving device, achieving better serving training effects, and meeting more requirements of users.

[0019] 4: In this application, two cleaning components are symmetrically arranged on the ring part. The cleaning components can scrape off the adhesions on the surface of the friction wheel to prevent the adhesions from affecting the friction coefficient of the friction wheel, and prevent the friction wheel from having a low serving force and a short serving distance due to the adhesions, so that the friction wheel always maintains a good serving effect, improves the serving performance of the serving device, reduces the number of maintenance times for users and reduces the labor intensity of users.

[0020] 5: In this application, the two cleaning components and the two isosceles trapezoidal convex plates are perpendicular to each other, so that when the two relative friction wheels are performing the serve simulation, the two cleaning components are just facing the other two friction wheels that are waiting to work and perform surface cleaning work on the two friction wheels that are waiting to work. The two friction wheels can be served while the two cleaning components are cleaning the other two friction wheels that are waiting to work, without interfering with each other, saving time, and having a reasonable design.

[0021] 6: The present application is provided with an auxiliary component, which includes a slide rod, a limit piece, a second spring, a second telescopic rod, a first rectangular column and a rubber top block. Through the cooperation of the slide rod, the limit piece, the second spring, the second telescopic rod, the first rectangular column and the rubber top block, when the telescopic rod is extended, the limit piece, the slide rod and the top block can be pushed forward by the first rectangular column, and then the top block at the front end can push the pickle ball to contact with the two friction wheels, so that the two friction wheels rotate, rub and squeeze to launch the pickle ball, thereby achieving a "loading" effect, enhancing the stability during serving, improving the performance of the serving device, and being more practical.

[0022] 7: The auxiliary components in this application also include a slide composed of shallow grooves and deep grooves, a second rectangular column, a slider, a third spring, a receiving groove, a block and a notch. Through the cooperation of the slide composed of shallow grooves and deep grooves, the second rectangular column, the slider, the third spring, the receiving groove, the block and the notch, and the second telescopic rod, the slide rod, the limiter, the second spring and the rubber top block, when the telescopic rod is retracted, the limiter, the slide rod and the top block can be pulled by the second rectangular column to compress the second spring and then release it, so that the compression of the second spring drives the rubber top block at the front end of the slide rod to move horizontally at high speed to hit the pickleball, thereby realizing the simulation of a straight shot launch, so as to meet the basic ball catching training of beginners, expand the applicable population of the serving device, and enhance the use effect of the serving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the internal structure of the present invention; Figure 3 Schematic diagram of the explosion structure of the level adjustment mechanism of the present invention; Figure 4 A schematic diagram of the structure of the launch mechanism of the present invention; Figure 5 A schematic diagram of the structure of a portion of the cleaning mechanism of the present invention; Figure 6 The overall front view of the cleaning mechanism of the present invention; Figure 7 A schematic cross-sectional view of the cleaning mechanism of the present invention; Figure 8 A schematic diagram of the structure of the elevation adjustment assembly and auxiliary components of the present invention; Figure 9 A schematic diagram of the cross-sectional structure of the auxiliary component of the present invention as a whole side structure diagram; Figure 10 A schematic diagram of the enlarged structure of the present invention; Figure 11 B is an enlarged schematic diagram of the present invention; Figure 12 It is a schematic cross-sectional view of the cooperation between the moving part and the disc of the present invention.

[0024] In the figure: 1. Chassis 1; 2. Chassis 2; 3. Shell 1; 4. Shell 2; 5. Launch port; 6. Insert tube; 7. Cylinder; 8. Ball guide track; 9. T-tube; 10. Ring gear 1; 11. Gear 1; 12. Motor 1; 13. Closing plate; 14. Arc track; 15. Ball launching mechanism; 16. Disc; 17. Round mouth; 18. T-slot; 19. Moving part; 20. U-shaped connecting part; 21. Friction wheel; 22. Motor 2; 23. Spring 1; 24. Ring part; 25. Ring gear 2; 26. Motor 3; 27. Gear 2; 28. Isosceles trapezoidal convex plate; 29. Rectangular bar; 30. Step surface; 31. Cleaning component; 32. Small exhaust fan; 33. Cleaning box; 34. Heating chamber; 35. Scrape Cavity; 36, material guide cavity; 37, collection cavity; 38, material suction cavity; 39, heating element; 40, rectangular opening one; 41, scraper; 42, gear three; 43, gear four; 44, motor four; 45, inclined plate; 46, collection box; 47, elevation adjustment component; 48, protrusion; 49, connecting plate; 50, telescopic rod one; 51, auxiliary component; 52, power supply box; 53, notch; 54, limit plate; 55, slide bar; 56, rubber top block; 57, limit piece; 58, rectangular protrusion; 59, spring two; 60, telescopic rod two; 61, rectangular column one; 62, slide groove; 63, shallow groove; 64, deep groove; 65, rectangular column two; 66, slider; 67, spring three; 68, receiving groove; 69, block; 70, notch. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Those skilled in the art should know that the embodiments described below are part of the embodiments disclosed in the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0026] Various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration only and not for limitation, and any name is only for distinction and does not have any limiting meaning.

[0027] The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0028] See also Figure 1-12The present invention is described in detail below with reference to the accompanying drawings and embodiments: A pickle ball automatic serving practice device comprises a chassis 1, a chassis 2 2 is rotatably provided on the top surface of the chassis 1, a shell 3 and a shell 2 4 are detachably provided on the top surface of the chassis 2, a launch port 5 is provided at the front end of the shell 3, the launch port 5 is used to provide a channel for shooting the pickle ball, a plug-in tube 6 is fixedly provided on the top surface of the shell 2 4, a column 7 is inserted in the plug-in tube 6, a ball guide track 8 is spirally provided on the column 7, and a side of the plug-in tube 6 is fixed. A T-tube 9 is provided, the vertical passage of which communicates with the interior of the housing 2 4 . The horizontal passage of the T-tube 9 is sealed at one end, while the other end is open and communicates with the bottom outlet of the ball guide track 8 . An intermittent feeding assembly is provided within the vertical passage of the T-tube 9 . This intermittent feeding assembly can sequentially move the pickle balls on the ball guide track 8 into the vertical passage, allowing them to enter the internal serving mechanism described later for orderly firing. The intermittent feeding assembly can employ a grooved wheel mechanism, which is conventional in the art and will not be further described in this solution.

[0029] See also Figure 1-3 A horizontal adjustment mechanism is provided between chassis 1 and chassis 2 2, and the horizontal adjustment mechanism includes a gear ring 10. A cylindrical groove is provided on the top surface of chassis 1, and gear ring 10 is rotatably provided in the cylindrical groove. The top surface of gear ring 10 is fixedly connected to the bottom surface of chassis 2 2, and a gear 11 is rotatably provided on the bottom surface of the cylindrical groove. Gear 11 is meshed with the teeth of the inner ring of gear ring 10. A stepped receiving groove is provided on the bottom surface of chassis 1, and a motor 12 is fixedly provided in the space with a small inner diameter of the stepped receiving groove. The output end of motor 12 is coaxially fixed with gear 11. A sealing plate 13 for fixing the motor is fixed in the cavity with a large inner diameter of the stepped receiving groove. The setting of the sealing plate 13 is conducive to the installation and stability of the motor 12. The motor 12 drives the gear 11 to rotate, and the rotation of the gear 11 drives the ring gear 10 to rotate, and then the ring gear 10 drives the chassis 2 and the parts thereon to rotate and swing in the horizontal direction, so that the horizontal direction of the serve can be automatically adjusted, thereby improving the use effect of the ball serving machine and meeting the user's ball catching training for pickleballs sent from different horizontal directions.

[0030] See also Figure 1-2, 4, 12, the inner top surface of the shell 2 4 is fixed with an arc track 14 through a flange, the opening of the vertical end of the arc track 14 is connected to the vertical channel of the T-tube 9, and a ball-serving mechanism 15 is provided on one side of the horizontal section of the arc track 14. The ball-serving mechanism 15 includes a disc 16, and a circular opening 17 is provided in the middle of the disc 16. The circular opening 17 is coaxially arranged with the horizontal section opening of the arc track 14 and the inner diameter of the circular opening 17 is larger than the inner diameter of the horizontal section opening. Four T-slots 18 are provided on the side of the disc 16 away from the arc track 14. The four T-slots 18 are all arranged along the radial direction of the disc 16 and are evenly distributed on the outside of the circular opening 17. One group of relative T-slots 18 are arranged vertically, and the other group of relative T-slots 18 are arranged horizontally; four T-slots 1 8 are all slidably provided with moving parts 19, and the top surface of the moving part 19 is fixedly provided with a U-shaped connecting part 20, and the opening of the U-shaped connecting part 20 is facing the center of the circular opening 17. A friction wheel 21 is rotatably provided in the opening of each U-shaped connecting part 20, and the friction wheel 21 can be made of rubber material. A motor 22 is fixedly provided on one side of each U-shaped connecting part 20, and the output end of the motor 22 passes through and rotates on the side of the U-shaped connecting part 20 and is fixedly connected to the friction wheel 21. Each motor 22 drives the corresponding friction wheel 21 separately, and a spring 1 23 is fixedly provided between each moving part 19 and the inner wall of the corresponding T-slot 18 away from the circular opening 17 side. When the spring 1 23 is in the original length state, the friction wheel 21 is at the outside of the circular opening 17; See also Figure 4-5 , a ring member 24 is coaxially rotated on the end face of the disc 16 away from the arc track 14, and a driving module for controlling the rotation of the ring member 24 is provided on one side of the disc 16. The driving module includes a motor 26 with a locking function. An anti-slip device is also provided between the disc 16 and the ring member 24 to prevent the ring member 24 from falling off from the surface of the disc 16 during rotation; the anti-slip device can adopt a limiting ring, and a rotating bearing can also be provided in the limiting ring, which can realize the rotation connection with the disc 16 and prevent the ring member 24 from falling off. It belongs to the conventional technology in this field and will not be described here.

[0031] A second gear ring 25 is fixedly provided on the side of the ring member 24 away from the arc track 14. The second gear ring 25 has a certain distance from the surface of the disc 16. The motor 3 26 is fixedly provided on the side of the disc 16 facing the arc track 14. The output end of the motor 3 26 passes through and rotates on the disc 16 and extends to the other side. A gear 2 27 is coaxially fixed to the top of the output shaft of the motor 3 26. The gear 2 27 is meshed with the second gear ring 25. Two isosceles trapezoidal convex plates 28 are symmetrically provided on the side of the second gear ring 25 away from the arc track 14. The connecting end of the U-shaped connector 20 is fixed to the top of the output shaft of the motor 3 26. A rectangular bar 29 is fixedly provided along the radial direction, and the outer ends of the rectangular bar 29 are all provided with rounded corners. The rectangular bar 29 and the isosceles trapezoidal convex plate 28 are in the same plane. The two sets of inclined surfaces of the two isosceles trapezoidal convex plates 28 are parallel to each other, namely, an inclined surface and a stepped surface 30, and the stepped surface 30 has at least one step. The outer end surface of the rectangular bar 29 abuts against the inner end surface of the isosceles trapezoidal convex plate 28, and a sliding fit is formed by moving on the end surface of the isosceles trapezoidal convex plate 28, and the lower end surface of the rectangular bar 29 can sequentially make surface contact with each step surface on the stepped surface 30; In the above structure, the motor 3 26 with a locking function can be started to drive the gear 2 27 to rotate, and the rotation of the gear 2 27 drives the gear ring 2 25 to rotate along the periphery of the disc 16. The rotation of the gear ring 25 drives the two symmetrically arranged isosceles trapezoidal convex plates 28 to rotate together. During the rotation of the two isosceles trapezoidal convex plates 28, the inclined surfaces of one side of the two isosceles trapezoidal convex plates 28 will gradually contact the rectangular bars 29 at the outer ends of one set of two opposite friction wheels 21. As the two isosceles trapezoidal convex plates 28 continue to rotate, the inclined surfaces of the two isosceles trapezoidal convex plates 28 will simultaneously push the two opposite friction wheels 21 gradually toward the center of the circular opening 17 (the pushing Initially, the spring 1 23 is in a stretched state, so that the distance between the two relative friction wheels 21 can be adjusted by the rotation angle of the two isosceles trapezoidal convex plates 28, thereby achieving the launch of friction wheels 21 of different sizes, so that the ball serving device can effectively simulate the serving of pickleballs of different sizes, thereby enhancing the functional effect and practicality of the ball serving device. When the rectangular bar 29 passes through the top of the isosceles trapezoidal convex plate 28, the inclined surface of the isosceles trapezoidal convex plate 28 can effectively prevent the friction wheel 21 from returning to its original position due to the reset of the spring 1 23, thereby avoiding damage to parts such as the moving part 19 due to the rapid return of the moving part 19, thereby improving the service life of the device. By disposing two sets of friction wheels 21 arranged perpendicular to each other, with one set arranged vertically and the other set arranged horizontally, and then by cooperating with the two isosceles trapezoidal convex plates 28 and the respective rectangular bars 29, the two friction wheels 21 in the relatively horizontal state and the relatively vertical state alternately operate. When the two friction wheels 21 in the vertical state operate, they can simulate topspin serves (i.e., positive spin serves) and backspin serves. When the two friction wheels 21 in the horizontal state operate, they can simulate left-hand serves and right-hand serves. Therefore, the serving device can select multiple spin directions for serving, thereby expanding the scope of application of the serving device and enhancing the functional effect and practicality of the serving device. Since the specifications and sizes of pickle balls produced by different brands may vary, a stepped surface 30 is set on one side of the two isosceles trapezoidal convex plates 28. Different step positions and different pushing distances of the horizontal surface of the top of the isosceles trapezoidal convex plates 28 to the rectangular bar 29 form different adjustment gears. Not only can the step positions of different gears be used to adapt to the sizes of pickle balls of different brands and specifications, but the position stability of the friction wheel 21 when it is in different gears can also be enhanced, thereby enhancing the applicability and practicality of the ball serving device.

[0032] See also Figure 2 、 5 , a cleaning assembly 31 is symmetrically provided on one side of the gear ring 25 away from the arc track 14, and the connecting line of the two cleaning assemblies 31 is perpendicular to the connecting line of the two isosceles trapezoidal convex plates 28. The stepped surface 30 of the isosceles trapezoidal convex plate 28 and the horizontal surface of the top of the isosceles trapezoidal convex plate 28 form different adjustment gears, and the horizontal surface of the top of the isosceles trapezoidal convex plate 28 also serves as a cleaning gear. When the relative rectangular bars 29 are at the top horizontal surface of the isosceles trapezoidal convex plate 28, the two cleaning assemblies 31 are respectively facing the corresponding friction wheels 21 and are located on the outside of the friction wheels 21. For example, when the rectangular bars 29 at the outer ends of the two friction wheels 21 in the vertical state are in contact with the cleaning gear, the two cleaning assemblies 31 are just The outer sides of the friction wheels 21 on both sides are in a horizontal state; when the rectangular bars 29 on the outer ends of the two friction wheels 21 in the horizontal state come into contact with the cleaning gear, the two cleaning assemblies 31 are just on the outer sides of the friction wheels 21 on both sides in a vertical state (i.e., when one set of opposing friction wheels 21 is performing the serving work, the cleaning assemblies 31 can clean the surfaces of the friction wheels 21 of the other set of friction wheels 21, thereby reducing the wear of the pickle balls and the adhesion to the friction wheels 21, and reducing the friction coefficient of the friction wheels 21 caused by the attachments. This ensures that each friction wheel 21 can always be in a good state when working, thereby extending the service life of the serving device, reducing the number of maintenance times by the user, and improving the practicality of the device); See also Figure 2 、 5-7, specifically, the cleaning component 31 includes a small exhaust fan 32 and a cleaning box 33, the cleaning box 33 is fixedly arranged on the top surface of the gear ring 25, the cleaning box 33 includes a heating chamber 34, a scraping chamber 35, a material guiding chamber 36, a collecting chamber 37 and a material suction chamber 38, the heating chamber 34 is at the upper end of the cleaning box 33 and is horizontal, and a heating element 39 is provided on the bottom surface of the heating chamber 34, the heating element 39 can adopt the existing resistance type, electromagnetic type or infrared heating method, which belongs to conventional technology and will not be repeated here. The heating element 39 is high The distance is set on the top surface of the friction wheel 21, and the scraping chamber 35 and the guide chamber 36 are both inclined. A rectangular opening 40 is opened on the inner side of the scraping chamber 35, and a scraper 41 is rotatably provided on the lower side of the rectangular opening 40. The scraper 41 is adapted to the contour of the friction wheel 21. A driving assembly for controlling the deflection of the scraper 41 is provided on the side of the cleaning box 33. The driving assembly includes a gear 3 42 and a gear 43 rotatably provided on the side of the cleaning box 33, and the gear 3 42 and the gear 43 are meshed. The gear 3 42 and the rotation of the scraper 41 are The cleaning box 33 is fixedly connected with the shaft, and a mounting bracket is fixedly provided on the side of the cleaning box 33. A motor 44 is fixedly provided on the top surface of the mounting bracket. The output shaft of the motor 44 is coaxially fixedly connected with the gear 43. The collection chamber 37 is communicated with the guide chamber 36. The tail end of the guide chamber 36 is tilted and provided with an inclined plate 45. The setting of the inclined plate 45 prevents the waste material in the collection chamber 37 from being poured out when the cleaning box 33 changes its position. The suction chamber 38 is horizontally arranged, and the top surface of the suction chamber 38 is lower than the bottom surface of the rectangular strip 29. The suction chamber 38 and the collection chamber 37 are connected by The partition is separated, and the small exhaust fan 32 is arranged in the suction chamber 38. A collection box 46 is inserted into the collection chamber 37. The collection box 46 is located below the inclined plate 45. After the collection box 46 is inserted into the collection chamber 37, its inner wall contacts the partition. The partition and the inner wall of the collection box 46 are respectively provided with filter holes, and the filter holes are used to prevent waste from entering the suction chamber 38 and collect the waste into the collection box 46. A through opening is provided on the side of the suction chamber 38 away from the partition. The setting of the through opening facilitates the normal use of the small exhaust fan 32. When the cleaning assembly 31 is running, the heating element 39 is first started to soften the adhesive on the friction wheel 21 by heating, and the softening degree is convenient for scraping. Then the motor 44 is started, and the motor 44 drives the scraper 41 to deflect toward the friction wheel 21, so that the front end of the scraper 41 contacts the surface of the friction wheel 21. Then the motor 22 is started again, so that the friction wheel 21 gradually rotates toward the front end of the scraper 41, so that the scraper 41 can scrape the softened adhesive on the surface of the friction wheel 21. The scraped waste will enter the collection box 46 in the collection chamber 37 along the surface of the scraper 41, the inclined surface of the guide chamber 36 and the inclined plate 45. While scraping, the small exhaust fan 32 is started to generate suction, forming an airflow moving into the collection box 46, thereby ensuring that the scraped waste enters the collection box 46 and stabilizes the waste in the collection box 46 so that it will not run around. When the friction wheel 21 is cleaned, start the motor four 44 to deviate the scraper 41 from the friction wheel 21, and at the same time turn off the small exhaust fan 32 and the motor two 22.

[0033] See also Figure 8 , an elevation adjustment assembly 47 is provided between the disc 16 and the curved track 14, and the elevation adjustment assembly 47 includes a protrusion 48, which is fixedly provided on the top surface of the chassis 2, and the top of the protrusion 48 is hingedly matched with the bottom end of the disc 16. The symmetrical tracks on both sides of the curved track 14 are provided with connecting plates 49, and the side of the connecting plate 49 facing the disc 16 is hingedly provided with an electrically driven telescopic rod 1 50, and the movable end of the telescopic rod 1 50 is hingedly matched with the side of the disc 16. Through the cooperation of the telescopic rod 1, the protrusion 48 and the disc 16, the extension or contraction of the telescopic rod 1 50 causes the disc 16 to deflect vertically at the deflection point of the protrusion 48 as a whole, thereby adjusting the vertical orientation angle of the friction wheel 21, and then realizing the adjustment of the elevation angle of the disc 16, realizing the launching of pickle balls at different heights, improving the applicability of the serving device, and improving the practicality of the serving device.

[0034] See also Figure 2 、 8-11, an auxiliary component 51 is provided on the side of the horizontal section of the arc track 14 away from the disc 16, the auxiliary component 51 includes a power supply box 52, a notch 53 is provided at the corner of the arc track 14, the width of the notch 53 is smaller than the diameter of the smallest size pickle ball, the power supply box 52 is fixedly arranged on the top surface of the chassis 2, a power supply is provided in the power supply box 52, and the power supply can be connected to an external charging device, a limit plate 54 is fixedly provided on the top surface of the power supply box 52, a slide rod 55 is slidably provided through the upper end of the limit plate 54, a rubber top block 56 is fixedly provided at the front end of the slide rod 55, and the rubber top block 56 points to the middle of the notch 53, a limit member 57 is fixedly provided in the middle of the slide rod 55 between the limit plate 54 and the arc track 14, the limit member 57 is annular and has a rectangular protrusion 58 at the lower end, and the limit member 5 A spring 2 59 is fixedly provided between 7 and the limit plate 54, and the spring 2 59 is sleeved on the slide bar 55. When the spring 2 59 is in the normal state, the rubber top block 56 at the front end is just outside the notch 53 (initial state), which will not affect the normal rolling of the pickle ball in the arc track 14. An electrically driven telescopic rod 2 60 is fixedly provided at the lower end of the limit plate 54. The upper and lower sides of the front end of the moving end of the telescopic rod 2 60 are set to form a horizontal plane. A rectangular column 1 61 is fixedly provided on the horizontal plane on the upper side of the moving end of the telescopic rod 2 60. The rectangular column 1 61 is located on the right side of the limit member 57. The rectangular column 1 61 is higher than the rectangular protrusion 58 at the lower end of the limit member 57 and is wider than the rectangular protrusion 58. When the telescopic rod 2 60 is in the semi-extended state (initial state), the rectangular column 1 61 is close to the limit member 57 in the normal position. By setting the telescopic rod 2 60, the slide bar 55, the spring 2 59, the limiter 57 and the rubber top block 56, the telescopic rod 2 60 can be started to extend, and the rectangular column 1 61 at the front end of the moving end of the telescopic rod 2 60 will gradually move toward the arc track 14, so that the rectangular column 1 61 pushes the limiter 57 to move toward the arc track 14 through the rectangular protrusion 58, and then the slide bar 55 moves together with the limiter 57. During the movement, the spring 2 59 is gradually stretched, and the rubber top block 56 at the front end of the slide bar 55 gradually passes through the notch 53 and contacts the pickle ball that is resting on the horizontal section of the arc track 14. Finally, the rubber top block 56 at the front end of the slide bar 55 gradually passes through the notch 53 and contacts the pickle ball that is resting on the horizontal section of the arc track 14. The rubber top block 56 pushes the pickle ball forward until the pickle ball contacts the two opposite friction wheels 21. After the contact, the two friction wheels 21 can be started to launch the pickle ball. The loading of the pickle ball by the rubber top block 56 makes the pickle ball more stable when it is launched through the friction wheels 21, further improving the launching effect. When the pickle ball is launched, the telescopic rod 2 60 is started to retract back to the semi-extended state (i.e., the initial state). During the contraction of the telescopic rod 2 60, the stretched spring 2 59 needs to be reset, so that the rubber top block 56 will also gradually move back to the initial position.

[0035] See also Figure 8-11In order to simulate the straight hit of a beginner so as to facilitate the catching training of the beginner in dealing with the straight hit, a slide groove 62 is provided on the top surface of the power supply box 52. The slide groove 62 consists of a shallow groove 63 with a longer length and a deep groove 64 with a shorter length, and the shallow groove 63 and the deep groove 64 are connected by an inclined surface. A rectangular opening 2 is provided through the horizontal surface on the upper side of the movable end of the telescopic rod 2 60. A rectangular column 2 65 is slidably provided in the rectangular opening 2. There is a certain gap between the rectangular column 2 65 and the rectangular column 1 61. A slider 66 is fixedly provided at the bottom end of the rectangular column 65. The slider 66 slides in the slide groove 62. A spring 3 67 is fixedly provided between the slider 66 and the horizontal surface on the lower side of the front end of the telescopic rod 2 60, and the spring 3 67 is sleeved. On the second rectangular column 65, when the second telescopic rod 60 is in the initial state of semi-extended, the slider 66 is in the shallow groove 63, the third spring 67 is in a compressed state, and the second rectangular column 65 is on the left side of the limiter 57 and slightly higher than the rectangular protrusion 58 below the limiter 57. The rectangular protrusion 58 of the limiter 57 is provided with a receiving groove 68 on the side facing the arc track 14. A stopper 69 is rotatably provided in the receiving groove 68. A notch 70 communicating with the other side is provided at the lower end of the receiving groove 68. The vertical depth of the notch 70 is less than the vertical depth of the receiving groove 68, so that the stopper 69 can only deflect toward the arc track 14. When the slider 66 is in the shallow groove 63, the upper end of the second rectangular column 65 is lower than the top surface of the notch 70. When it is necessary to simulate a straight hit, the telescopic rod 2 60 is first started to contract, so that the rectangular column 2 65 gradually contacts the stopper 69 and pulls the stopper 69 away from the arc track 14. Due to the restriction of the side of the accommodating groove 68 on the stopper 69, the rectangular column 2 65 will pull the limit piece 57, the slide bar 55 and the rubber top block 56 together to move away from the arc track 14. During the movement, the spring 2 59 is gradually compressed. At the same time, the slider 66 gradually slides along the shallow groove 63 toward the deep groove 64. When the slider 66 gradually enters the deep groove 64 through the inclined surface, the spring 3 67 gradually resets, thereby moving the rectangular column 2 65 downward and finally the upper end of the rectangular column 2 65 away from the stopper 69, thereby releasing the limit of the limit piece 57, the slide bar 55, the rubber top block 56 and the spring 2 59. The spring 3 67 quickly resets, and the rubber top block 56 at the front end is released. The rubber top block 56 quickly resets and passes through the notch 53 to finally hit the pickle ball on the horizontal section of the arc track 14 with force. The hit pickle ball is quickly ejected from the launch port 5 at high speed. After the rubber top block 56 hits the pickle ball, it still returns to its original position due to the reset of the spring 2 59, and then the telescopic rod 2 60 is started to extend, so that the moving end of the telescopic rod 2 60 gradually returns to its original position. During the extension process, the slider 66 gradually slides from the deep groove 64 to the shallow groove 63. When the rectangular column 2 65 contacts the stopper 69 (at this time the rectangular column 2 65 is on the right side of the stopper 69), the rectangular column 2 65 will push the stopper 69 to deflect, and then the rectangular column 2 65 can pass through the notch 70 and the stopper 69. After the rectangular column 2 65 passes through the stopper 69, the stopper 69 itself is deflected back to the vertical state again due to the influence of gravity, thereby completing the reset of the direct hit simulation.

[0036] When this solution is running, first determine which spin direction launching method you want to achieve based on the size of the pickle ball. Taking the up and down spin launching as an example, start the motor three 26, and the motor three 26 drives the gear two 27 to rotate. The rotation of the gear two 27 drives the gear ring two 25 to rotate, thereby causing the two isosceles trapezoidal convex plates 28 to rotate around the disc 16 together, and the rotation direction is that the step surface 30 rotates toward the vertically arranged friction wheel 21. During the rotation, the step surface 30 of the isosceles trapezoidal convex plate 28 gradually contacts the rectangular bar 29 of the vertically arranged friction wheel 21 and gradually pushes the friction wheel 21 toward the center of the circular mouth 17 through the inclined surface of the step surface 30. According to the size of the pickle ball, the rectangular bar 29 is placed on the corresponding step gear (the higher the step surface, the smaller the pickle ball size). After adjusting the distance between the two vertical friction wheels 21, start the intermittent rotation. The feeding assembly guides the pickle ball at the bottom of the ball guide track 8 into the vertical channel of the T-tube 9. The pickle ball enters the arc track 14 through the vertical channel of the T-tube 9. Due to the restriction of the two adjusted friction wheels 21, the pickle ball stays on the horizontal section of the arc track 14. Then, the two vertically arranged friction wheels 21 are started to rotate by the second motor 22. The two friction wheels 21 rotate in opposite directions. Then, the second telescopic rod 60 is started to extend. The second rectangular column 65 at the front end of the moving end of the second telescopic rod 60 pushes the sliding rod 55 and the rubber top block 56 through the notch 53 through the limiter 57 and contacts the pickle ball staying in the horizontal section of the arc track 14, so that the pickle ball gradually contacts the two rotating friction wheels 21. The two friction wheels 21 rub and squeeze the pickle ball, and then the pickle ball is launched out at high speed through the launch port 5. The spin direction of the pickle ball is controlled by the steering speed of the two friction wheels 21. When the upper friction wheel 21 rotates faster toward the launch port 5, the launched pickle ball is a topspin ball. When the lower friction wheel 21 rotates faster toward the launch port 5, the launched pickle ball is a backspin ball. After the pickle ball is launched, the telescopic rod 2 60 is activated to retract back to the semi-extended state (i.e., back to the initial state), and then another pickle ball is pushed in through the intermittent feeding component, and the above action is repeated to continuously serve the ball.

[0037] When serving simulations at different horizontal positions are required, during the serving process, motor 12 is started, which drives gear 11 to rotate, and the rotation of gear 11 drives ring gear 10 to rotate, and then ring gear 10 drives chassis 2 2 and the entire upper portion to rotate and swing in the horizontal direction, thereby realizing serving simulations at different horizontal positions.

[0038] When it is necessary to simulate different launching heights, the telescopic rod 50 is started to extend or retract the telescopic rod 50. When the telescopic rod 50 is retracted, the disc 16 as a whole will gradually deflect in the arc-shaped filing direction with the protrusion 48 as the deflection point, thereby causing the angle of the circular opening 17 to gradually tilt upward, so that the initial angle between the pickle ball and the ground after being launched between the friction wheels 21 becomes larger and larger. Conversely, when the telescopic rod 50 is controlled to be extended, the angle at which the pickle ball is launched becomes lower.

[0039] When a direct hit simulation is required, the entire device is first raised by placing a rack, and then the pickle ball is fed to the horizontal section of the arc track 14. The motor 3 26 is then started to dislocate the isosceles trapezoidal convex plate 28 and the rectangular bar 29, so that all the friction wheels 21 are outside the circular opening 17 to prevent the friction wheels 21 from blocking the launch of the pickle ball. The telescopic rod 20 is then started to retract, so that the rectangular column 2 65 gradually contacts the block 69 and pulls the block 69 away from the arc track 14. The side of the receiving groove 68 is restricted by the block 69, so that the rectangular column 2 65 will pull the limit piece 57, the slide bar 55 and the rubber top block 56 to move away from the arc track 14. During the movement, the spring 2 59 is gradually compressed. At the same time, the slider 66 gradually slides along the shallow groove 63 toward the deep groove 64. When the slider 66 gradually enters the deep groove 64 through the inclined surface, the spring 3 67 gradually resets, thereby moving the rectangular column 2 65 downward and finally the upper end of the rectangular column 2 65 is separated from the block 69, thereby making the limit The limit of the position piece 57, the slide bar 55, the rubber top block 56 and the spring 2 59 is released, and the spring 3 67 is quickly reset, and then the front rubber top block 56 is quickly reset and passes through the slot 53 to finally hit the pickle ball on the horizontal section of the arc track 14. The hit pickle ball is quickly shot out from the launch port 5 at high speed. After the rubber top block 56 hits the pickle ball, it still returns to its original position due to the reset of the spring 2 59, and then the telescopic rod 2 60 is started to extend, so that the moving end of the telescopic rod 2 60 gradually returns to its original position. During the extension process, the slider 66 gradually slides from the deep groove 64 to the shallow groove 63. When the rectangular column 65 contacts the stopper 69 (the rectangular column 65 is on the right side of the stopper 69 at this time), the rectangular column 65 will push the stopper 69 to deflect, and then the rectangular column 65 can pass through the gap 70 and the stopper 69. After the rectangular column 65 passes through the stopper 69, the stopper 69 itself is affected by gravity and deflects back to the vertical state again, thereby completing the reset of the straight hit simulation. This reciprocating process can continuously simulate the straight hit serve.

[0040] After the ball serving device has been used for a period of time, taking the two vertical friction wheels 21 for serving as an example, by starting the motor three 26, the vertical rectangular bar 29 is on the horizontal plane of the top surface of the isosceles trapezoidal convex plate 28 (i.e., on the cleaning gear), and at this time, the cleaning assembly 31 arranged perpendicular to the isosceles trapezoidal convex plate 28 is just opposite to the friction wheels 21 on the left and right sides, and then the heating element 39 is started to soften the adhesion on the friction wheel 21 by heating, and the softening degree is convenient for scraping, and then the motor four 44 is started, and the motor four 44 drives the scraper 41 to deflect toward the friction wheel 21, so that the front end of the scraper 41 contacts the surface of the friction wheel 21, and then the motor two 22 is started to make the friction wheel 21 gradually rotate toward the front end of the scraper 41, so that the scraper 41 can scrape the softened adhesion on the surface of the friction wheel 21, and scrape The scraped waste will enter the collection box 46 in the collection chamber 37 along the surface of the scraper 41, the inclined surface of the guide chamber 36 and the inclined plate 45. While scraping, the small exhaust fan 32 is started to generate suction, forming an airflow moving toward the collection box 46, thereby ensuring that the scraped waste enters the collection box 46 and stabilizes the waste in the collection box 46 so that it will not run around. When the friction wheel 21 is cleaned, start motor four 44 to deviate the scraper 41 from the friction wheel 21. At the same time, turn off the small exhaust fan 32 and motor two 22. When the two vertically arranged friction wheels 21 need to be cleaned, just make the horizontal surface of the top of the isosceles trapezoidal convex plate 28 contact the rectangular bars 29 on the left and right sides. At this time, the cleaning component 31 can be opposite to the two vertically arranged friction wheels 21. Repeat the above operation to complete the cleaning of the two vertical friction wheels 21.

[0041] When the waste in the collection box 46 needs to be processed, first remove the shell 13 from the shell 2 4 and the chassis 2 2 so that the disc 16 is exposed as a whole, then pull the collection box 46 out of the cleaning box 33 to empty the waste in the collection box 46, then put it back into the cleaning box 33, and then install it back into the shell 13.

[0042] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "inside", "outside" and other terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0043] In addition, in the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A pickleball automatic serving practice device, characterized by: It includes chassis one, chassis two is rotatably provided on the top surface of chassis one, shell one and shell two are disassembled and provided on the top surface of chassis two, a T-shaped tube is provided on the top surface of shell two, an arc track is provided on the inner top surface of shell two, a ball-serving mechanism is provided on one side of the horizontal section of the arc track, the ball-serving mechanism includes a disc, four friction wheels are vertically provided on the side surface of the disc, a ring is rotatably provided on the outer side of the disc, two isosceles trapezoidal convex plates are symmetrically provided on the ring, a cleaning assembly is symmetrically provided on the ring, the connecting line of the two cleaning assemblies and the connecting line of the two isosceles trapezoidal convex plates are perpendicular to each other, and an auxiliary assembly is provided on one side of the horizontal section of the arc track.

2. The automatic pickleball serving practice device according to claim 1, characterized in that: An emission port is provided at the front end of the first shell, a plug-in tube with a column inserted therein is provided on the top surface of the second shell, a ball guide track is provided on the column, one end of the horizontal channel of the T-tube is in a closed state, the bottom outlet of the ball guide track is connected to the open end of the T-tube, and an intermittent feeding assembly is provided in the vertical channel of the T-tube.

3. The automatic pickleball serving practice device according to claim 1, characterized in that: A horizontal adjustment mechanism is provided between chassis one and chassis two, and the horizontal adjustment mechanism includes a gear ring one. A cylindrical groove is provided on the top surface of chassis one, and gear ring one rotates in the cylindrical groove. The top surface of gear ring one is fixedly connected to the bottom surface of chassis two, and gear one rotates on the bottom surface of the cylindrical groove, and gear one is engaged with gear ring one. A stepped accommodating groove is provided on the bottom surface of chassis one, and motor one is fixedly provided in the space with a small inner diameter of the stepped accommodating groove, and the output end of motor one is fixed coaxially with the gear, and a sealing plate is fixedly provided in the space with a large inner diameter of the stepped accommodating groove.

4. The automatic pickleball serving practice device according to claim 1, characterized in that: The ball-serving mechanism also includes a spring 1. A circular opening is provided in the middle of the disc, which is coaxial with the horizontal section opening of the arc track and has an inner diameter larger than the horizontal section opening. Four T-slots are provided on one side of the disc, which are perpendicular to each other and evenly distributed on the outside of the circular opening. A moving part with a U-shaped connecting part on the top surface is slidably provided in each of the four T-slots. The openings of the U-shaped connecting parts are all facing the center of the circular opening. The friction wheel rotates in the opening of the U-shaped connecting part. A motor 2 with an output end fixedly connected to the friction wheel is provided on one side of the U-shaped connecting part. Each motor 2 drives the corresponding friction wheel separately. The spring 1 is provided between the moving part and the T-slot. When the spring 1 is in its original length state, the friction wheels are all outside the circular opening.

5. The automatic pickleball serving practice device according to claim 4, characterized in that: A driving module for controlling the rotation of the annular member is provided on one side of the disc. A rectangular bar with rounded corners on the outer end is provided at the connecting end of the U-shaped connector. The rectangular bar and the isosceles trapezoidal convex plate are on the same plane. The two sets of inclined surfaces parallel to each other of the two isosceles trapezoidal convex plates are respectively an inclined surface and a stepped surface, and the stepped surface has at least one step. The rectangular bar and the isosceles trapezoidal convex plate are in sliding fit.

6. The automatic pickleball serving practice device according to claim 1, characterized in that: The cleaning component includes a small exhaust fan and a cleaning box arranged on the top surface of the annular member. The cleaning box includes a heating chamber, a scraping chamber, a material guiding chamber, a collecting chamber and a material suction chamber. The heating chamber is located at the upper end of the cleaning box and is horizontal. A heating element is provided on the bottom surface of the heating chamber. The heating element is a set distance higher than the top surface of the friction wheel. A rectangular opening is provided on the inner side surface of the scraping chamber. A scraper adapted to the contour of the friction wheel is rotatably provided on the lower side of the rectangular opening. A driving component for controlling the deflection of the scraper is provided on the side of the cleaning box.

7. The automatic pickleball serving practice device according to claim 6, characterized in that: The collecting chamber is connected to the material guiding chamber, and an inclined plate is arranged at the tail end of the material guiding chamber. The suction chamber is arranged horizontally and the top surface of the suction chamber is lower than the bottom surface of the rectangular strip. The suction chamber and the collecting chamber are separated by a partition. A small exhaust fan is arranged in the suction chamber. A collecting box is inserted in the collecting chamber. The collecting box is located below the inclined plate. Filter holes are correspondingly provided on the inner wall of the partition and the collecting box. A through opening is provided on the side of the suction chamber away from the partition.

8. The automatic pickleball serving practice device according to claim 1, characterized in that: An elevation adjustment component is provided between the disc and the curved track. The elevation adjustment component includes a protrusion. The protrusion is fixedly provided on the top surface of the second chassis. The top of the protrusion is hinged to the bottom end of the disc. Connecting plates are symmetrically fixed on both sides of the curved track. A telescopic rod 1 is hinged on the side of the connecting plate facing the disc. The movable end of the telescopic rod 1 is hinged to the side of the disc.

9. The automatic pickleball serving practice device according to claim 1, characterized in that: The auxiliary component includes a power supply box arranged on the top surface of the second chassis, a slot with a width smaller than the diameter of the smallest size pickle ball is opened at the corner of the curved track, a limit plate is provided on the top surface of the power supply box, a sliding rod is slidingly provided on the upper end of the limit plate, a rubber top block pointing to the middle of the slot is provided at the front end of the slide rod, a limit piece with a ring shape and a rectangular protrusion at the lower end is provided on the middle part of the slide rod between the limit plate and the curved track, a spring 2 is provided between the limit piece and the limit plate, when the spring 2 is in the original length state, the rubber top block is just outside the slot, a telescopic rod 2 is provided at the lower end of the limit plate, a rectangular column 1 is provided on the upper side of the movable end of the telescopic rod 2 and is located on the right side of the limit piece, the rectangular column 1 is higher than the rectangular protrusion at the lower end of the limit piece and is wider than the rectangular protrusion.

10. The automatic pickleball serving practice device according to claim 9, characterized in that: A sliding groove consisting of a shallow groove and a deep groove is provided on the top surface of the power supply box. A rectangular column 2 with a slider at the bottom end is vertically slidably provided at the front end of the movable end of the telescopic rod 2. The slider slides in the sliding groove. A spring 3 is provided between the slider and the movable end of the telescopic rod 2. When the telescopic rod 2 is in the semi-extended initial state, the slider is in the shallow groove, the spring 3 is in a compressed state, and the rectangular column 2 is on the left side of the limit member and is higher than the rectangular protrusion below the limit member. A receiving groove is provided on one side of the rectangular protrusion of the limit member, and a block is rotatably provided in the receiving groove. A notch is provided through the lower end of the receiving groove, and the vertical depth of the notch is less than the vertical depth of the receiving groove. When the slider is in the shallow groove, the upper end of the rectangular column 2 is lower than the top surface of the notch.

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