Tennis ball serving device

Abstract

The utility model belongs to the technical field of sports equipment, and discloses a tennis ball serving device. The device comprises a ball extruding module, a pitching transmission module, a horizontal swinging transmission module, a first tapered roller bearing connecting module and a second tapered roller bearing connecting module. The ball extruding module comprises a first mounting plate and a ball extruding assembly, the pitching transmission module comprises a second mounting plate and a pitching transmission assembly, the horizontal swinging transmission module comprises a third mounting plate and a horizontal swinging transmission assembly, and the first mounting plate is rotatably connected to the second mounting plate through the first tapered roller bearing connecting module; and the third mounting plate is rotatably connected to the second mounting plate through the second tapered roller bearing connecting module. Through the arrangement of the first tapered roller bearing connecting module and the second tapered roller bearing connecting module, the motion control precision of the ball squeezing module, the pitching transmission module and the horizontal swing transmission module can be improved, and therefore the practicability and the use reliability of the whole tennis serving device are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sports equipment, in particular to a tennis serving device. Background Art

[0002] A tennis serving device automatically launches a tennis ball for training, replacing the need for a coach to feed the ball. It allows trainees to repeatedly practice hitting from multiple angles. Existing tennis serving devices on the market, while featuring intelligent programming, remote control, and height adjustability, lack precision in ball drop control due to other transmission methods, such as connecting rods. This leads to excessive vibration throughout the device, making it difficult to achieve high-precision, high-quality ball delivery angles.

[0003] Based on the above, there is an urgent need for a tennis serving device to solve the problems existing in the prior art. Utility Model Content

[0004] The purpose of the utility model is to provide a tennis serving device which can improve the accuracy of serving a ball and enhance the practicability.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A tennis serving device comprising:

[0007] A ball squeezing module includes a first mounting plate and a ball squeezing assembly, the ball squeezing assembly being mounted on the first mounting plate. The ball squeezing assembly includes a pair of ball squeezing wheels, wherein a ball serving opening is defined between the pair of ball squeezing wheels. The pair of ball squeezing wheels are capable of relative rotation to squeeze a tennis ball out of the serving opening along a predetermined path.

[0008] A pitch transmission module includes a second mounting plate and a pitch transmission assembly, wherein the pitch transmission assembly is mounted on the second mounting plate, and an output shaft of the pitch transmission assembly is drivingly connected to the first mounting plate to enable the angle between the serving port and the horizontal plane to be changed;

[0009] A horizontal swing transmission module includes a third mounting plate and a horizontal swing transmission assembly, wherein the horizontal swing transmission assembly is mounted on the third mounting plate, and an output shaft of the horizontal swing transmission assembly is drivingly connected to the second mounting plate to enable the pitch transmission module to swing horizontally;

[0010] a first tapered roller bearing connecting module, wherein the first mounting plate is rotatably connected to the second mounting plate via the first tapered roller bearing connecting module;

[0011] A second tapered roller bearing connecting module, wherein the third mounting plate is rotatably connected to the second mounting plate through the second tapered roller bearing connecting module.

[0012] Preferably, the first tapered roller bearing connection module includes a first bearing bolt, a first pitch tapered roller bearing, a second pitch tapered roller bearing, a first bearing sleeve, a first gasket, a first nut and a first locking nut. The first pitch tapered roller bearing and the second pitch tapered roller bearing are respectively fitted and connected to opposite sides of the second mounting plate. The first bearing sleeve is embedded in the first pitch tapered roller bearing or the second pitch tapered roller bearing. A first through hole is provided on the first mounting plate. The threaded section of the first bearing bolt is sequentially passed through the first through hole, the first pitch tapered roller bearing, the second mounting plate, the second pitch tapered roller bearing and the first gasket, and is threadedly connected to the first locking nut.

[0013] Preferably, the second tapered roller bearing connection module includes a second bearing bolt, a horizontally swinging first tapered roller bearing, a horizontally swinging second tapered roller bearing, a second bearing sleeve, a second gasket, a second nut and a second locking nut. The horizontally swinging first tapered roller bearing and the horizontally swinging second tapered roller bearing are respectively fitted and connected to the opposite sides of the second mounting plate. The second bearing sleeve is embedded in the horizontally swinging first tapered roller bearing or the horizontally swinging second tapered roller bearing. A second through hole is provided on the third mounting plate. The threaded section of the second bearing bolt is sequentially passed through the second through hole, the horizontally swinging first tapered roller bearing, the third mounting plate, the horizontally swinging second tapered roller bearing and the second gasket, and is threadedly connected to the second locking nut.

[0014] Preferably, the horizontal swing transmission module also includes a plurality of foot pad assemblies evenly distributed on the third mounting plate, the foot pad assembly including a foot pad body, an elastic member, a foot pad nut and a foot pad bolt, the foot pad bolt is sequentially passed through the foot pad body and the third mounting plate, and is threadedly connected to the foot pad nut, the foot pad nut is fitly connected to the third mounting plate, and the elastic member is clamped between the foot pad body and the third mounting plate.

[0015] Preferably, the pitch transmission assembly includes a pitch transmission drive, a pitch main transmission wheel and a pitch slave transmission wheel, the pitch transmission drive is fixedly mounted on the second mounting plate, the output shaft of the pitch transmission drive is transmission-connected to the pitch main transmission wheel, the pitch main transmission wheel is transmission-connected to the pitch slave transmission wheel, and the pitch slave transmission wheel is fixedly mounted on the first mounting plate.

[0016] Preferably, the second mounting plate is provided with a pitch limiting slot;

[0017] The pitch transmission module also includes a pitch limit assembly, which includes a pitch limit bolt and a pitch limit locking nut. The threaded section of the pitch limit bolt passes through the first mounting plate and the pitch limit slot and is slidably disposed in the pitch limit slot. The pitch limit locking nut is threadedly connected to the pitch limit bolt and is fitly connected to the first mounting plate.

[0018] Preferably, the horizontal swing transmission module includes a horizontal swing transmission drive, a horizontal swing main transmission wheel and a horizontal swing slave transmission wheel. The horizontal swing transmission drive is fixed on the second mounting plate. The output shaft of the horizontal swing transmission drive is connected to the horizontal swing main transmission wheel. The horizontal swing main transmission wheel is connected to the horizontal swing slave transmission wheel. The horizontal swing slave transmission wheel is fixed on the third mounting plate.

[0019] Preferably, the second mounting plate is provided with a horizontal swing limiting groove;

[0020] The horizontal swing transmission module also includes a horizontal swing limit assembly, which includes a horizontal swing limit bolt and a horizontal swing limit locking nut. The threaded section of the horizontal swing limit bolt passes through the third mounting plate and the horizontal swing limit groove and can be slidably arranged in the horizontal swing limit groove. The horizontal swing limit locking nut is threadedly connected to the horizontal swing limit bolt and is fitly connected to the third mounting plate.

[0021] Preferably, the pitch transmission module further comprises a pitch angle sensor module, and the pitch angle sensor module is installed and electrically connected to the pitch transmission driver;

[0022] The horizontal swing transmission module further includes a horizontal swing angle sensor module, which is installed on and electrically connected to the horizontal swing transmission driver.

[0023] Preferably, the pitch transmission module further comprises a pitch angle control magnet module, and the pitch angle control magnet module is installed and electrically connected to the pitch transmission driver;

[0024] The horizontal swing transmission module further includes a horizontal swing angle magnet module, which is installed on and electrically connected to the horizontal swing transmission driver.

[0025] Beneficial effects of the utility model:

[0026] This embodiment provides a tennis serving device. By arranging a first tapered roller bearing connection module and a second tapered roller bearing connection module in the device, the tennis serving device provided by this embodiment can avoid the problems of insufficient accuracy in ball drop control and excessive vibration of the entire device caused by the transmission mechanisms such as connecting rods used in the prior art. The transmission connection method of the first tapered roller bearing connection module and the second tapered roller bearing connection module can effectively reduce the vibration of the entire device, and at the same time can improve the motion control accuracy of the ball squeezing module, the pitch transmission module and the horizontal swing transmission module, thereby greatly improving the practicality and reliability of the entire tennis serving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 1 is a schematic structural diagram of a tennis serving device provided by an embodiment of the present invention from a first viewing angle;

[0028] Figure 2 This is an exploded schematic diagram of the tennis serving device provided by an embodiment of the present utility model;

[0029] Figure 3 This is a structural diagram of a ball squeezing module provided by an embodiment of the present utility model;

[0030] Figure 4 This is a structural diagram of the pitch transmission module provided by an embodiment of the present utility model;

[0031] Figure 5 This is an exploded schematic diagram of the pitch transmission module provided by an embodiment of the present utility model;

[0032] Figure 6 1 is a schematic structural diagram of a tennis serving device provided by an embodiment of the present utility model from a second viewing angle;

[0033] Figure 7 This is a structural diagram of a horizontal swing transmission module provided by an embodiment of the present utility model;

[0034] Figure 8 It is an exploded schematic diagram of the horizontal swing transmission module provided by an embodiment of the present utility model.

[0035] In the picture:

[0036] 1. Ball squeezing module; 11. First mounting plate; 121. Ball squeezing drive member; 122. Ball squeezing wheel; 1221. Ball serving port;

[0037] 2. Pitch transmission module; 21. Second mounting plate; 211. Pitch limit slot; 212. Horizontal swing limit slot; 221. Pitch transmission driver; 222. Pitch master transmission wheel; 223. Pitch slave transmission wheel; 23. Pitch limit assembly; 231. Pitch limit bolt; 232. Pitch limit locking nut; 24. Pitch angle sensor module; 25. Pitch angle control magnet module;

[0038] 3. Horizontal swing transmission module; 31. Third mounting plate; 321. Horizontal swing transmission driver; 322. Horizontal swing main transmission wheel; 323. Horizontal swing slave transmission wheel; 33. Horizontal swing limit assembly; 331. Horizontal swing limit bolt; 332. Horizontal swing limit locking nut; 34. Horizontal swing angle sensor module; 35. Horizontal swing angle magnet module; 36. Foot pad assembly; 361. Foot pad body; 362. Elastic member; 363. Foot pad nut; 364. Foot pad bolt;

[0039] 4. First tapered roller bearing connection module; 41. First bearing bolt; 42. Pitch first tapered roller bearing; 43. Pitch second tapered roller bearing; 44. First bearing sleeve; 45. First gasket; 46. First screw sleeve; 47. First locking nut;

[0040] 5. Second tapered roller bearing connection module; 51. Second bearing bolt; 52. Horizontally swinging first tapered roller bearing; 53. Horizontally swinging second tapered roller bearing; 54. Second bearing sleeve; 55. Second gasket; 56. Second nut; 57. Second locking nut. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0042] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0045] The technical solution provided by the present invention is described below in conjunction with the accompanying drawings and specific implementation methods.

[0046] This embodiment provides a tennis ball serving device, combined with Figure 1 and Figure 2 As shown, it includes a ball squeezing module 1, a pitch transmission module 2, a horizontal swing transmission module 3, a first tapered roller bearing connection module 4 and a second tapered roller bearing connection module 5.

[0047] refer to Figure 3 As shown, the ball squeezing module 1 specifically includes a first mounting plate 11 and a ball squeezing assembly. The ball squeezing assembly is mounted on the first mounting plate 11. In one embodiment of the present invention, the ball squeezing assembly includes a ball squeezing driver 121 and a pair of ball squeezing wheels 122. The ball squeezing driver 121 is a motor and can be mounted on the first mounting plate 11 by screws or other means. There are two ball squeezing drivers 121, which are connected to the ball squeezing wheels 122 in a one-to-one transmission manner. The ball squeezing wheels 122 are spaced apart in the vertical direction and define a ball launching port 1221 therebetween. During use, the output shafts of the two ball squeezing drivers 121 rotate in opposite directions, so that when the two ball squeezing drivers 121 are activated, the pair of ball squeezing wheels 122 can rotate relative to each other to clamp the tennis ball. The tennis ball is squeezed between the two ball squeezing wheels 122, and the rotation of the ball squeezing wheels 122 generates a forward propulsion force, thereby launching the tennis ball along a predetermined path.

[0048] Combine Figure 3 、 Figure 4As shown, the pitch transmission module 2 specifically includes a second mounting plate 21 and a pitch transmission assembly. The pitch transmission assembly is mounted on the second mounting plate 21. In one implementation of this embodiment, the pitch transmission assembly includes a pitch transmission driver 221, a pitch main transmission wheel 222, and a pitch slave transmission wheel 223. The pitch transmission driver 221 is fixedly mounted on the second mounting plate 21. The pitch transmission driver 221 is also a motor. The output shaft of the pitch transmission driver 221 is transmission-connected to the pitch main transmission wheel 222, which is in turn transmission-connected to the pitch slave transmission wheel 223. The pitch slave transmission wheel 223 is fixedly mounted on the first mounting plate 11. Both the pitch main transmission wheel 222 and the pitch slave transmission wheel 223 rotate about an axis parallel to the horizontal plane. When the above-mentioned pitch transmission module 2 is in use, after the pitch transmission driver 221 is started, the output shaft of the pitch transmission driver 221 can drive the pitch main transmission wheel 222 to rotate, and the pitch main transmission wheel 222 then drives the pitch slave transmission wheel 223 and the entire ball squeezing module 1 to rotate, so that the angle between the ball serving port 1221 and the horizontal plane can be changed.

[0049] In this embodiment, the pitch transmission module 2 can also limit the pitch angle of the serving port 1221, thereby preventing the serving port 1221 from having an excessively large or low pitch angle, which would result in an undesirable flight trajectory of the tennis ball. Figure 3 、 Figure 5 As shown, a pitch limit groove 211 is provided on the second mounting plate 21, and the pitch limit groove 211 is specifically an arc-shaped groove; the pitch transmission module 2 also includes a pitch limit assembly 23. One implementation method of this embodiment is that the pitch transmission module 2 includes a pitch limit bolt 231 and a pitch limit locking nut 232, wherein the threaded section of the pitch limit bolt 231 is passed through the first mounting plate 11 and the pitch limit groove 211, and is slidably provided in the pitch limit groove 211, and the pitch limit locking nut 232 is threadedly connected to the pitch limit bolt 231 and is fitly connected to the first mounting plate 11.

[0050] Thus, the pitch limit slot 211 restricts the pitch limit bolt 231 to slide within a certain range, thereby limiting the pitch angle of the serving port 1221. Furthermore, the provision of the pitch limit locking nut 232 ensures that the pitch limit bolt 231 is securely mounted on the first mounting plate 11, thereby improving the installation stability of the pitch limit bolt 231 within the pitch limit slot 211. Furthermore, the pitch limit assembly 23 is simple in structure and easy to implement, making the entire tennis serving device more lightweight and cost-effective.

[0051] More specifically, refer to Figure 4As shown, in this embodiment, the pitch transmission module 2 also includes a pitch angle sensor module 24, which is installed and electrically connected to the pitch transmission driver 221. Through the action of the pitch angle sensor module 24, the pitch transmission driver 221 achieves high-precision control of the pitch angle of the serving port 1221, further improving the effect of precise control of the pitch angle of the serving port 1221.

[0052] More specifically, continue to refer to Figure 4 As shown, in this embodiment, the pitch transmission module 2 also includes a pitch angle control magnet module 25. One implementation method of this embodiment is that the pitch angle control magnet module 25 is installed and electrically connected to the low-speed end of the reduction gearbox of the pitch transmission driver 221. The pitch angle control magnet module 25 can help the pitch transmission driver 221 to accurately control the rotation angle of the pitch main transmission wheel 222 by detecting the speed of the low-speed end of the reduction gearbox, thereby accurately controlling the pitch angle of the serving port 1221.

[0053] Combine Figure 4 、 Figure 7 As shown, the horizontal swing transmission module 3 specifically includes a third mounting plate 31 and a horizontal swing transmission assembly. The third mounting plate 31 is fixedly arranged, and the horizontal swing transmission assembly is mounted on the third mounting plate 31. In one implementation of this embodiment, the horizontal swing transmission assembly includes a horizontal swing transmission driver 321, a horizontal swing main transmission wheel 322, and a horizontal swing slave transmission wheel 323. Among them, the horizontal swing transmission driver 321 also uses a motor. The output shaft of the horizontal swing transmission driver 321 is transmission-connected to the horizontal swing main transmission wheel 322, and the horizontal swing main transmission wheel 322 is transmission-connected to the horizontal swing slave transmission wheel 323. The horizontal swing slave transmission wheel 323 is fixedly arranged on the second mounting plate 21, and the horizontal swing main transmission wheel 322 and the horizontal swing slave transmission wheel 323 both rotate around an axis perpendicular to the horizontal plane.

[0054] It should be noted that, in this embodiment, the second mounting plate 21 is an L-shaped plate, the vertical portion of which is used to fix the ball squeezing module 1 and the pitch transmission module 2, and the horizontal portion of which is used to fix the above-mentioned horizontal swing transmission module 3, so that the ball squeezing module 1, the pitch transmission module 2 and the horizontal swing transmission module 3 can be assembled through a second mounting plate 21, thereby effectively improving the integrity and compactness of the entire tennis serving device and the connection reliability between the modules.

[0055] For example, when the above-mentioned horizontal swing transmission module 3 is in use, after the horizontal swing transmission driver 321 is started, the driving force of the output shaft of the horizontal swing transmission driver 321 can be gradually transmitted to the third mounting plate 31 through the horizontal swing main transmission wheel 322 and the horizontal swing slave transmission wheel 323. Since the third mounting plate 31 is fixed, the horizontal swing slave transmission wheel 323 can react to the horizontal swing main transmission wheel 322 at this time, so that the horizontal swing main transmission wheel 322 can cause the entire pitch transmission module 2 and the ball squeezing module 1 to swing horizontally, thereby realizing the horizontal left and right swing of the serving port 1221 to adjust the horizontal serving direction.

[0056] In this embodiment, the horizontal swing transmission module 3 further includes a horizontal swing limiting assembly 33 , which can improve the accuracy of the tennis ball's flight trajectory in the horizontal direction by restricting the horizontal swing angle range of the serving port 1221 .

[0057] refer to Figure 5 、 Figure 7 As shown, the second mounting plate 21 is further provided with a horizontal swing limiting groove 212, which is specifically an arc-shaped groove. The horizontal swing limiting assembly 33 includes a horizontal swing limiting bolt 331 and a horizontal swing limiting locking nut 332. The threaded section of the horizontal swing limiting bolt 331 passes through the third mounting plate 31 and the horizontal swing limiting groove 212 and is slidably disposed within the horizontal swing limiting groove 212. The horizontal swing limiting nut is threadedly connected to the horizontal swing limiting bolt 331 and is then securely connected to the third mounting plate 31.

[0058] In the above arrangement, the restraining action of the horizontal swing limiter slot 212 allows the horizontal swing limiter bolt 331 to slide within a certain horizontal angle range, thereby limiting the horizontal swing angle of the serving port 1221. Furthermore, the provision of the horizontal swing limiter locknut 332 ensures that the horizontal swing limiter bolt 331 is securely mounted on the third mounting plate 31, thereby enhancing the stability of the horizontal swing limiter bolt 331 within the horizontal swing limiter slot 212. Furthermore, the structure of the horizontal swing limiter assembly 33 is simplified, making the entire tennis serving device more portable, more practical, and easier to assemble.

[0059] More specifically, combined Figure 4 、 Figure 5As shown, in this embodiment, the horizontal swing transmission module 3 also includes a horizontal swing angle sensor module 34, which is installed and electrically connected to the horizontal swing transmission driver 321. When the serving mouth 1221 swings horizontally to the specified horizontal serving position, the horizontal swing angle sensor module 34 can immediately send a stop signal to the horizontal swing transmission driver 321, so that the horizontal swing transmission driver 321 can immediately control the pitch transmission module 2 and the ball squeezing module 1 to stop at the specified horizontal serving position, thereby achieving high-precision control of the horizontal angle of the tennis ball.

[0060] More specifically, in this embodiment, the horizontal swing transmission module 3 also includes a horizontal swing angle magnet module 35. One implementation of this embodiment is that the horizontal swing angle magnet module 35 is installed and electrically connected to the low-speed end of the reduction gearbox of the horizontal swing transmission driver 321. Similar to the operating principle of the pitch angle magnet module, the horizontal swing angle control magnet module can help the horizontal swing transmission driver 321 accurately control the rotation angle of the horizontal swing main transmission wheel 322 by detecting the speed of the low-speed end of the reduction gearbox of the horizontal swing transmission driver 321. Not only does it respond quickly, but it can also finely adjust the horizontal swing angle of the serving port 1221 to a specified horizontal serving position by slowing down the rotation speed of the horizontal swing main transmission wheel 322.

[0061] refer to Figure 1 As shown, the first tapered roller bearing connection module 4 is disposed between the first mounting plate 11 and the second mounting plate 21 , so that the first mounting plate 11 can be rotatably connected to the second mounting plate 21 through the first tapered roller bearing connection module 4 .

[0062] Specifically, refer to Figure 5As shown, in one implementation of this embodiment, the first tapered roller bearing connection module 4 includes a first bearing bolt 41, a first pitch tapered roller bearing 42, a second pitch tapered roller bearing 43, a first bearing sleeve 44, a first washer 45, a first screw sleeve 46, and a first locking nut 47. The first pitch tapered roller bearing 42 and the second pitch tapered roller bearing 43 are respectively attached to opposite sides of the second mounting plate 21, thereby effectively sharing the load of the first bearing bolt 41, thereby enhancing the load-bearing capacity of the first tapered roller bearing connection module 4 and providing good motion balance for the first bearing bolt 41. In this embodiment, the inner hole radial size of the first pitch tapered roller bearing 42 is larger than that of the second pitch tapered roller bearing 43, so that the first screw sleeve 46 can be nested in the first tapered roller bearing. A first through hole is provided on the first mounting plate 11. The threaded section of the first bearing bolt 41 is successively passed through the first through hole, the first pitch tapered roller bearing 42, the second mounting plate 21, the second pitch tapered roller bearing 43 and the first gasket 45, and is threadedly connected to the first locking nut 47.

[0063] Through the above-mentioned arrangement, the tightness of the connection of the various components of the first tapered roller bearing connecting module 4 is ensured. By reducing the clearance between the ball squeezing module 1 and the pitch transmission module 2, the first tapered roller bearing connecting module 4 can withstand a greater force, which greatly improves the driving accuracy of the pitch transmission component on the ball squeezing module 1, and effectively reduces the vibration generated during the operation of the ball squeezing module 1 and the pitch transmission module 2, thereby reducing the jitter phenomenon of the entire tennis serving device, and further helping to improve the serving accuracy of the serving port 1221 in terms of pitch height.

[0064] The second tapered roller bearing connection module 5 is disposed between the second mounting plate 21 and the third mounting plate 31 , so that the second mounting plate 21 can be rotatably connected to the third mounting plate 31 through the second tapered roller bearing connection module 5 .

[0065] Specifically, combined Figure 5 、 Figure 6As shown, in one implementation of this embodiment, the second tapered roller bearing connection module 5 includes a second bearing bolt 51, a horizontally swinging first tapered roller bearing 52, a horizontally swinging second tapered roller bearing 53, a second bearing sleeve 54, a second washer 55, a second screw sleeve 56, and a second locking nut 57. The horizontally swinging first tapered roller bearing 52 and the horizontally swinging second tapered roller bearing 53 are respectively attached to opposite sides of the second mounting plate 21. This effectively shares the load of the second bearing bolt 51, thereby enhancing the load-bearing capacity of the second tapered roller bearing connection module 5 and the motion balance of the second bearing bolt 51. In this embodiment, the radial size of the inner hole of the horizontally swinging first tapered roller bearing 52 is larger than the radial size of the inner hole of the horizontally swinging second tapered roller bearing 53, so that the second screw sleeve 56 can be nested in the second tapered roller bearing, and a second through hole is provided on the second mounting plate 21. The threaded section of the second bearing bolt 51 is successively passed through the second through hole, the horizontally swinging first tapered roller bearing 52, the third mounting plate 31, the horizontally swinging second tapered roller bearing 53 and the second gasket 55, and is threadedly connected to the second locking nut 57.

[0066] Through the above-mentioned arrangement, the tightness of the connection of the various components of the second tapered roller bearing connection module 5 is ensured. By reducing the clearance between the pitch transmission module and the horizontal swing transmission module 3, the second tapered roller bearing connection module 5 can withstand a greater force, which greatly improves the driving accuracy of the horizontal swing transmission component on the pitch transmission module 2, and effectively reduces the vibration generated during the operation of the pitch transmission module 2 and the horizontal swing transmission module 3, thereby further reducing the jitter phenomenon of the entire tennis serving device, and thus helping to improve the serving accuracy of the serving port 1221 on the horizontal plane.

[0067] Through the arrangement of the above-mentioned first tapered roller bearing connection module 4 and the second tapered roller bearing connection module 5, the tennis serving device provided in this embodiment can avoid the problems of insufficient accuracy in ball falling control and excessive vibration of the whole machine caused by the transmission mechanisms such as connecting rods used in the prior art. The transmission connection method of the first tapered roller bearing connection module 4 and the second tapered roller bearing connection module 5 can effectively reduce the vibration of the whole machine, and at the same time can improve the motion control accuracy of the ball squeezing module 1, the pitch transmission module 2 and the horizontal swing transmission module 3, thereby greatly improving the practicality and reliability of the entire tennis serving device.

[0068] Optionally, the horizontal swing transmission module 3 further includes a plurality of foot pad assemblies 36 evenly distributed and mounted on the third mounting plate 31. Specifically, refer to Figure 7 、 Figure 8As shown, in this embodiment, a foot pad assembly 36 is positioned at each corner of the third mounting plate 31. The foot pad assembly 36 comprises a foot pad body 361, an elastic member 362, a foot pad nut 363, and a foot pad bolt 364. The foot pad bolt 364 is sequentially inserted through the foot pad body 361 and the third mounting plate 31, and then threadedly connected to the foot pad nut 363. By rotating the foot pad nut 363, the third mounting plate 31 can be fine-tuned to ensure its levelness. The foot pad nut 363 is securely attached to the third mounting plate 31. The elastic member 362 is a strip spring, with one end of the elastic member 362 abutting the foot pad body 361 and the other end abutting the bottom of the third mounting plate 31. The elastic member 362 effectively absorbs vibration, thereby further reducing vibration transmission during operation of the tennis serving device and improving stability. Furthermore, the design of the foot pad assembly 36 simplifies the installation process, facilitating assembly and improving disassembly and assembly efficiency during maintenance.

[0069] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A tennis ball serving device, characterized in that: include: A ball squeezing module (1) comprises a first mounting plate (11) and a ball squeezing assembly, wherein the ball squeezing assembly is mounted on the first mounting plate (11), and the ball squeezing assembly comprises a pair of ball squeezing wheels (122), wherein a ball serving port (1221) is defined between the pair of ball squeezing wheels (122), and the pair of ball squeezing wheels (122) can rotate relative to each other to squeeze a tennis ball out of the ball serving port (1221) along a predetermined route; A pitch transmission module (2) comprises a second mounting plate (21) and a pitch transmission assembly, wherein the pitch transmission assembly is mounted on the second mounting plate (21), and an output shaft of the pitch transmission assembly is connected to the first mounting plate (11) in a driving manner so that the angle between the serving port (1221) and the horizontal plane can be changed; A horizontal swing transmission module (3) comprises a third mounting plate (31) and a horizontal swing transmission assembly, wherein the horizontal swing transmission assembly is mounted on the third mounting plate (31), and an output shaft of the horizontal swing transmission assembly is connected to the second mounting plate (21) so as to enable the pitch transmission module (2) to swing horizontally; a first tapered roller bearing connection module (4), wherein the first mounting plate (11) is rotatably connected to the second mounting plate (21) via the first tapered roller bearing connection module (4); A second tapered roller bearing connection module (5), wherein the third mounting plate (31) is rotatably connected to the second mounting plate (21) via the second tapered roller bearing connection module (5).

2. The tennis serving device according to claim 1, wherein: The first tapered roller bearing connection module (4) comprises a first bearing bolt (41), a pitch first tapered roller bearing (42), a pitch second tapered roller bearing (43), a first bearing sleeve (44), a first washer (45), a first screw sleeve (46) and a first locking nut (47). The pitch first tapered roller bearing (42) and the pitch second tapered roller bearing (43) are respectively connected to opposite sides of the second mounting plate (21). The first bearing sleeve (44) is embedded in the pitch first tapered roller bearing (42) or the pitch second tapered roller bearing (43). The first mounting plate (11) is provided with a first through hole. The threaded section of the first bearing bolt (41) is sequentially passed through the first through hole, the pitch first tapered roller bearing (42), the second mounting plate (21), the pitch second tapered roller bearing (43) and the first washer (45), and then is threadedly connected to the first locking nut (47).

3. The tennis serving device according to claim 1, wherein: The second tapered roller bearing connection module (5) comprises a second bearing bolt (51), a horizontally swinging first tapered roller bearing (52), a horizontally swinging second tapered roller bearing (53), a second bearing sleeve (54), a second washer (55), a second screw sleeve (56) and a second locking nut (57). The horizontally swinging first tapered roller bearing (52) and the horizontally swinging second tapered roller bearing (53) are respectively connected to opposite sides of the second mounting plate (21). The second bearing sleeve (54) is embedded in the horizontally swinging first tapered roller bearing (52) or the horizontally swinging second tapered roller bearing (53). The third mounting plate (31) is provided with a second through hole. The threaded section of the second bearing bolt (51) is sequentially passed through the second through hole, the horizontally swinging first tapered roller bearing (52), the third mounting plate (31), the horizontally swinging second tapered roller bearing (53) and the second washer (55), and then is threadedly connected to the second locking nut (57).

4. The tennis serving device according to claim 1, wherein: The horizontal swing transmission module (3) further comprises a plurality of foot pad assemblies (36) uniformly mounted on the third mounting plate (31), wherein the foot pad assemblies (36) comprise a foot pad body (361), an elastic member (362), a foot pad nut (363) and a foot pad bolt (364), wherein the foot pad bolt (364) is sequentially passed through the foot pad body (361) and the third mounting plate (31) and then threadedly connected to the foot pad nut (363), wherein the foot pad nut (363) is fittedly connected to the third mounting plate (31), and the elastic member (362) is sandwiched between the foot pad body (361) and the third mounting plate (31).

5. The tennis serving device according to claim 1, wherein: The pitch transmission assembly comprises a pitch transmission driver (221), a pitch main transmission wheel (222) and a pitch slave transmission wheel (223); the pitch transmission driver (221) is fixed on the second mounting plate (21); the output shaft of the pitch transmission driver (221) is transmission-connected to the pitch main transmission wheel (222); the pitch main transmission wheel (222) is transmission-connected to the pitch slave transmission wheel (223); and the pitch slave transmission wheel (223) is fixed on the first mounting plate (11).

6. The tennis serving device according to claim 5, wherein: The second mounting plate (21) is provided with a pitch limiting groove (211); The pitch transmission module (2) further includes a pitch limiting assembly (23), the pitch limiting assembly (23) including a pitch limiting bolt (231) and a pitch limiting locking nut (232), the threaded section of the pitch limiting bolt (231) passing through the first mounting plate (11) and the pitch limiting slot (211), and slidably arranged in the pitch limiting slot (211), the pitch limiting locking nut (232) being threadedly connected to the pitch limiting bolt (231) and being closely connected to the first mounting plate (11).

7. The tennis serving device according to claim 5, wherein: The horizontal swing transmission module (3) comprises a horizontal swing transmission driver (321), a horizontal swing main transmission wheel (322) and a horizontal swing slave transmission wheel (323); the horizontal swing transmission driver (321) is fixed on the second mounting plate (21); the output shaft of the horizontal swing transmission driver (321) is transmission-connected to the horizontal swing main transmission wheel (322); the horizontal swing main transmission wheel (322) is transmission-connected to the horizontal swing slave transmission wheel (323); and the horizontal swing slave transmission wheel (323) is fixed on the third mounting plate (31).

8. The tennis serving device according to claim 7, wherein: The second mounting plate (21) is provided with a horizontal swing limiting groove (212); The horizontal swing transmission module (3) further includes a horizontal swing limiting assembly (33), the horizontal swing limiting assembly (33) including a horizontal swing limiting bolt (331) and a horizontal swing limiting locking nut (332), the threaded section of the horizontal swing limiting bolt (331) passing through the third mounting plate (31) and the horizontal swing limiting groove (212), and being slidably disposed in the horizontal swing limiting groove (212), the horizontal swing limiting locking nut (332) being threadedly connected to the horizontal swing limiting bolt (331) and being closely connected to the third mounting plate (31).

9. The tennis ball serving device according to claim 7, wherein: The pitch transmission module (2) further includes a pitch angle sensor module (24), and the pitch angle sensor module (24) is installed and electrically connected to the pitch transmission driver (221); The horizontal swing transmission module (3) further comprises a horizontal swing angle sensor module (34), and the horizontal swing angle sensor module (34) is installed on and electrically connected to the horizontal swing transmission driving member (321).

10. The tennis serving device according to claim 9, wherein: The pitch transmission module (2) further comprises a pitch angle control magnet module (25), wherein the pitch angle control magnet module (25) is mounted on and electrically connected to the pitch transmission driver (221); The horizontal swing transmission module (3) further comprises a horizontal swing angle magnet module (35), and the horizontal swing angle magnet module (35) is installed and electrically connected to the horizontal swing transmission driving member (321).

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