Tennis pitching machine

Abstract

The utility model provides a tennis ball serving machine, which relates to the technical field of ball serving machines and comprises a shell, an upper fixing plate fixedly mounted at the top of the shell, a bottom plate fixedly mounted at the bottom of the shell, a rotary ball feeding mechanism arranged in a ball inlet hole, and a mounting plate rotatably mounted on the upper surface of the bottom plate. An automatic serving mechanism is rotationally arranged at the end of one side of the fixed side plate, a ball outlet window is arranged at the position, corresponding to the automatic serving mechanism, of the surface of the shell, and an elevation angle adjusting mechanism for adjusting the serving elevation angle is arranged between the fixed side plate and the automatic serving mechanism. And a left-right adjusting structure for adjusting the left-right serving direction of the automatic serving mechanism is arranged between the mounting plate and the bottom plate. The pitching frequency of the tennis pitching machine is stable through the rotary ball feeding mechanism, the pitching angle and the pitching direction of the pitching mechanism can be automatically adjusted by arranging the elevation angle adjusting mechanism and the left-right adjusting mechanism, and the training efficiency of athletes is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of ball serving machine technology, and in particular to a tennis ball serving machine. Background Technology

[0002] Tennis training is a planned and organized comprehensive training activity aimed at improving tennis players' technical level, physical fitness, mental qualities, and competitive ability. It mainly includes hitting technique training, which involves repeatedly practicing techniques such as forehand, backhand, volley, and overhead smash to develop stable and efficient hitting motions.

[0003] When training hitting techniques, tennis ball machines are usually used in conjunction with the training. The tennis ball is directly served by the tennis ball machine, allowing athletes to practice hitting techniques. However, existing tennis ball machines take up a lot of space, making them inconvenient to move and store. Moreover, existing tennis ball machines are prone to jamming during the serving process, resulting in irregular serving frequency. Furthermore, the serving angle of existing ball machines cannot be automatically adjusted, requiring athletes to make manual adjustments during training, which reduces the training efficiency of athletes. Utility Model Content

[0004] To address the technical problems of existing tennis ball serving machines, such as large space occupation, inconvenience in movement and storage, easy ball jamming during the serving process, resulting in irregular serving frequency, and inability to automatically adjust the serving angle, this utility model provides a tennis ball serving machine.

[0005] The tennis ball serving machine provided by this utility model adopts the following technical solution:

[0006] A tennis ball serving machine includes a housing, an upper fixed plate fixedly mounted on the top of the housing, and a bottom plate fixedly mounted on the bottom of the housing. A cylindrical ball-scooping groove protrudes downward from the center of the upper fixed plate, and a ball-inlet hole is provided through the bottom of the ball-scooping groove. A folding ball basket for storing multiple tennis balls is provided on the upper part of the upper fixed plate, and a rotating ball-feeding mechanism is provided in the ball-inlet hole. The rotating ball-feeding mechanism automatically feeds the tennis balls in the folding ball basket into the ball-inlet hole in sequence. An mounting plate is rotatably mounted on the upper surface of the bottom plate, and a fixed side plate is fixedly mounted on the upper part of the mounting plate. An automatic ball-serving mechanism is rotatably mounted on one end of the fixed side plate. A ball-ejection window is provided on the surface of the housing corresponding to the automatic ball-serving mechanism. An elevation angle adjustment mechanism for adjusting the ball-ejection angle is provided between the fixed side plate and the automatic ball-ejecting mechanism. A left-right adjustment structure for adjusting the left and right ball-ejection direction of the automatic ball-ejecting mechanism is provided between the mounting plate and the bottom plate.

[0007] Furthermore, a guide plate is provided between the upper fixed plate and the automatic ball-serving mechanism to guide the tennis ball into the automatic ball-serving mechanism. A bottom window is provided in the bottom plate at a position corresponding to the automatic ball-serving mechanism. The bottom of the automatic ball-serving mechanism extends into the bottom window, and a protective cover is fixedly installed at the bottom of the bottom window.

[0008] Furthermore, the folding ball basket includes two first baffles mirror-mounted on the top of the upper fixed plate and two second baffles mirror-mounted on the top of the upper fixed plate. Angular mounting blocks are provided at the four corners of the top of the upper fixed plate, and the first and second baffles are rotatably connected to the angular mounting blocks, allowing them to flip up and down. By rotating the first and second baffles upwards on the angular mounting blocks, the first and second baffles form a square folding ball basket with closed sides on the top of the upper fixed plate.

[0009] Furthermore, the rotating ball feeding mechanism includes a ball feeding disc rotatably disposed within the ball-entry groove. Multiple ball guide holes are evenly distributed on the surface of the ball feeding disc. A lever is fixedly disposed at the top center of the ball feeding disc to prevent multiple tennis balls from getting stuck. The lever is positioned between two adjacent ball guide holes. A rotary motor is fixedly installed at the bottom of the ball-entry groove to drive the ball feeding disc to rotate. The rotary motor drives the ball feeding disc to rotate, aligning the multiple ball guide holes on the ball feeding disc with the ball-entry holes. An infrared sensor is disposed on the ball-entry groove, located on the side of the ball-entry hole. A ball-blocking structure, a baffle, is disposed on the upper part of the upper fixed plate to prevent multiple tennis balls from simultaneously falling into the ball-entry hole. This ball-blocking structure is a baffle plate, fixedly installed on the upper part of the upper fixed plate at a position corresponding to the ball-entry hole. The ball feeding disc is rotatably disposed at the bottom of the baffle plate.

[0010] Furthermore, the automatic serving mechanism includes a serving wheel, a serving motor mounting plate, and a serving motor. The serving motor mounting plate is rotatably mounted on one end of the fixed side plate. The serving wheels are rotatably mounted on the upper and lower ends of the serving motor mounting plate, respectively. A serving channel is located between the two serving wheels. A serving motor that drives the two serving wheels to rotate in the direction of the serving channel is fixedly mounted on the side of the serving motor mounting plate. Under the squeezing force of the two serving wheels, the tennis ball flies outward through the serving channel.

[0011] Furthermore, the elevation angle adjustment mechanism includes an elevation angle adjustment motor, a first eccentric block, and a rocker arm. The elevation angle adjustment motor is fixedly installed on the side of the fixed side plate away from the ball-serving motor mounting plate. The transmission shaft of the elevation angle adjustment motor passes through the fixed side plate and a first eccentric block is fixedly installed at its end. One end of the first eccentric block is fixedly connected to the transmission shaft of the elevation angle adjustment motor, and the other end is rotatably connected to one end of the rocker arm. The end of the rocker arm away from the first eccentric block is rotatably connected to the bottom of the ball-serving motor mounting plate.

[0012] Furthermore, the left and right adjustment structure includes a left and right adjustment motor and an eccentric slide rail. The left and right adjustment motor is fixedly installed on the upper surface of the mounting plate near the elevation adjustment motor. An eccentric slide rail is provided in the base plate at a position corresponding to the left and right adjustment motor. The eccentric slide rail is an elongated circular hole. A second eccentric block is fixedly installed at the end of the drive shaft of the left and right adjustment motor. One end of the second eccentric block is fixedly connected to the drive shaft of the left and right adjustment motor, and the other end extends downward to have a connecting shaft. The connecting shaft is rotatably disposed in the eccentric slide rail.

[0013] Furthermore, a wheel is provided at the end of the base plate away from the ball exit window, a support foot is installed protruding downward at the other end of the base plate, and a telescopic handle is provided on the outer wall of the housing away from the ball exit window.

[0014] In summary, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model reduces the space occupied by the tennis ball serving machine by making the foldable ball basket foldable, making it easier to move and store the tennis ball serving machine.

[0016] 2. In use, this utility model uses a rotating ball feeding mechanism to store the tennis balls to be launched into multiple ball guide holes on the ball feeding plate. During the rotation of the ball feeding machine, the tennis balls in the ball feeding plate are sequentially fed into the ball inlet holes, preventing the ball serving frequency of the tennis ball serving machine from changing due to the tennis balls not being fed into the ball inlet holes in time during the launch process.

[0017] 3. By setting up an elevation angle adjustment mechanism and a left and right adjustment structure, the launch angle and launch direction of the serving mechanism can be automatically adjusted, effectively improving the training efficiency of athletes.

[0018] 4. By setting an infrared sensor as the blank ball compensation structure of this ball serving machine, when the infrared sensor does not detect a tennis ball, the rotary motor will immediately rotate to add another tennis ball, thereby ensuring that there is always a tennis ball waiting to be launched at the position of the infrared sensor, so as to ensure that the ball serving machine does not serve blank balls. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is an exploded view of the present invention;

[0021] Figure 3 This is a schematic diagram of the ball feeding tray structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the guide plate structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the internal structure of this utility model;

[0024] Figure 6 This is a schematic diagram of the bottom structure of this utility model.

[0025] In the diagram: 1-Shell; 2-Folding ball basket; 3-Telescopic handle; 4-Wheel; 5-Supporting foot; 6-Upper fixing plate; 7-Ball feed tray; 8-Guide plate; 9-Base plate; 10-Automatic ball serving mechanism; 11-Ball serving wheel; 12-Ball serving motor mounting plate; 13-Ball serving motor; 14-Fixed side plate; 15-First eccentric block; 16-Rocker arm; 17-Elevation angle adjustment motor; 18-Left and right adjustment motor; 19-Mounting plate; 20-Rotation motor; 21-Infrared sensor; 101-Ball exit window; 201-First baffle; 202-Second baffle; 601-Ball inlet groove; 602-Angle mounting block; 603-Baffle; 6011-Ball inlet hole; 701-Ball guide hole; 702-Lever; 901-Eccentric slide; 902-Bottom window; 903-Protective cover. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0027] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The image shows a tennis ball serving machine.

[0028] The first embodiment of this utility model, referred to... Figures 1-3 As shown, a tennis ball serving machine is disclosed, including a housing 1. An upper fixing plate 6 is fixedly installed on the top of the housing 1, and a bottom plate 9 is fixedly installed on the bottom of the housing 1. A cylindrical ball-scooping groove 601 is provided protruding downward at the center of the upper fixing plate 6. A ball-inlet hole 6011 is provided through the bottom of the ball-scooping groove 601. Tennis balls enter the interior of the housing 1 through the ball-inlet hole 6011. A folding ball basket 2 for storing multiple tennis balls is provided on the upper part of the upper fixing plate 6. A rotating ball-feeding mechanism is provided in the ball-inlet hole 6011. The rotating ball-feeding mechanism automatically feeds the tennis balls in the folding ball basket 2 into the ball-inlet hole 6011 in sequence. (Refer to...) Figure 2 , Figure 4 and Figure 5As shown, a mounting plate 19 is rotatably mounted on the upper surface of the base plate 9. A fixed side plate 14 is fixedly mounted on the upper part of the mounting plate 19. An automatic ball-serving mechanism 10 is rotatably mounted on one end of the fixed side plate 14. An elevation angle adjustment mechanism for adjusting the ball's elevation angle is provided between the fixed side plate 14 and the automatic ball-serving mechanism 10. A left-right adjustment structure for adjusting the left and right ball-serving directions of the automatic ball-serving mechanism 10 is provided between the mounting plate 19 and the base plate 9. A guide plate 8 for guiding the tennis ball into the automatic ball-serving mechanism 10 is provided between the upper fixed plate 6 and the automatic ball-serving mechanism 10. (Refer to...) Figure 2 As shown, a bottom window 902 is provided in the base plate 9 at a position corresponding to the automatic ball-serving mechanism 10. The bottom of the automatic ball-serving mechanism 10 extends into the bottom window 902, and a protective cover 903 is fixedly installed at the bottom of the bottom window 902, protruding downwards. A ball-ejection window 101 is provided on the surface of the housing 1 at a position corresponding to the automatic ball-serving mechanism 10, allowing the tennis ball to fly out from inside the housing 1.

[0029] As a preferred option, refer to Figure 2 As shown, the folding ball basket 2 includes two first baffles 201 mirror-mounted on the top of the upper fixed plate 6 and two second baffles 202 mirror-mounted on the top of the upper fixed plate 6. Angle-shaped mounting blocks 602 are provided protruding upwards at the four corners of the top of the upper fixed plate 6. The first baffles 201 and the second baffles 202 are rotatably connected to the angle-shaped mounting blocks 602, allowing them to be flipped up and down. By rotating the first baffles 201 and the second baffles 202 upwards on the angle-shaped mounting blocks 602, the first baffles 201 and the second baffles 202 form a square folding ball basket 2 with closed sides on the top of the upper fixed plate 6.

[0030] Reference Figure 3As shown, the rotating ball feeding mechanism includes a ball feeding disc 7 rotatably disposed within the ball-entry groove 601. Multiple ball guide holes 701 are evenly distributed on the surface of the ball feeding disc 7. A lever 702 is fixedly disposed at the top center of the ball feeding disc 7 to prevent multiple tennis balls from getting stuck. The lever 702 is positioned between two adjacent ball guide holes 701. A rotary motor 20 is fixedly installed at the bottom of the ball-entry groove 601 to drive the ball feeding disc 7 to rotate. The rotary motor 20 drives the ball feeding disc 7 to rotate, aligning the multiple ball guide holes 701 on the ball feeding disc 7 with the ball entry holes 6011. An infrared sensor 21 is disposed on the ball-entry groove 601. Infrared sensor 21 is located on the side of ball inlet 6011. Infrared sensor 21 serves as a ball-canceling compensation structure for this ball-serving machine. When infrared sensor 21 does not detect a tennis ball, the rotary motor 17 immediately rotates to add another tennis ball, ensuring that there is always a tennis ball ready to be launched at the position of infrared sensor 21, thus preventing the ball-serving machine from serving empty balls. A ball-blocking structure is provided on the upper fixed plate 6 to prevent multiple tennis balls from falling into the ball inlet 6011 simultaneously. Preferably, this ball-blocking structure is a baffle 603, located on the upper part of the upper fixed plate 6 and... A baffle 603 is fixedly installed at the corresponding position of the ball inlet 6011. The ball feeder 7 is rotatably set at the bottom of the baffle 603. In use, when one of the ball guide holes 701 of the ball feeder 7 is aligned with the ball inlet 6011, the tennis ball in the ball guide hole 701 falls into the ball inlet 6011. Under the blocking effect of the baffle 603, other tennis balls above the ball guide hole 701 are effectively prevented from falling into the ball inlet 6011 through the ball guide hole 701. This structure effectively ensures that the tennis ball serving machine can stably serve balls in sequence during use.

[0031] Reference Figure 2 As shown, the automatic serving mechanism 10 includes a serving wheel 11, a serving motor mounting plate 12, and a serving motor 13. The serving motor mounting plate 12 is rotatably mounted on one end of the fixed side plate 14. The serving wheel 11 is rotatably mounted on the upper and lower ends of the serving motor mounting plate 12, respectively. A serving channel is located between the two serving wheels 11. The serving motor 13, which drives the two serving wheels 11 to rotate in the direction of the serving channel, is fixedly mounted on the side of the serving motor mounting plate 12. In use, under the squeezing force of the two serving wheels 11, the tennis ball can fly outward through the serving channel.

[0032] As a preferred option, refer to Figure 2 and Figure 5As shown, the elevation angle adjustment mechanism includes an elevation angle adjustment motor 17, a first eccentric block 15, and a rocker arm 16. The elevation angle adjustment motor 17 is fixedly installed on the side of the fixed side plate 14 away from the ball-serving motor mounting plate 12. The transmission shaft of the elevation angle adjustment motor 17 passes through the fixed side plate 14 and the first eccentric block 15 is fixedly installed at its end. One end of the first eccentric block 15 is fixedly connected to the transmission shaft of the elevation angle adjustment motor 17, and the other end is rotatably connected to one end of the rocker arm 16. The end of the rocker arm 16 away from the first eccentric block 15 is rotatably connected to the bottom of the ball-serving motor mounting plate 12. In use, the elevation angle adjustment motor 17 drives the first eccentric block 15 to rotate. During the rotation, the first eccentric block 15 drives the rocker arm 16 to move the bottom of the ball-serving motor mounting plate 12 up or down, thereby adjusting the launching angle of the automatic ball-serving mechanism 10 in the elevation direction.

[0033] Reference Figure 2 and Figure 6 As shown, the left-right adjustment structure includes a left-right adjustment motor 18 and an eccentric slide 901. The left-right adjustment motor 18 is fixedly installed on the upper surface of the mounting plate 19 near the elevation adjustment motor 17. The eccentric slide 901 is located in the base plate 9 at a position corresponding to the left-right adjustment motor 18. The eccentric slide 901 is an elongated circular hole. A second eccentric block is fixedly installed at the end of the drive shaft of the left-right adjustment motor 18. One end of the second eccentric block is fixedly connected to the drive shaft of the left-right adjustment motor 18, and the other end extends downward to have a connecting shaft. This connecting shaft is rotatably disposed within the eccentric slide 901. In use, the left-right adjustment motor 18 drives the second eccentric wheel to rotate. During the rotation, the connecting shaft at the bottom of the second eccentric wheel, under the resistance of the side of the eccentric slide 901, drives the left-right adjustment motor 18 to rotate in the opposite direction. The left-right adjustment motor 18 drives the mounting plate 19 and the automatic ball-launching mechanism 10 to rotate left or right on the base plate 9, thereby adjusting the launching angle of the automatic ball-launching mechanism 10 to the left or right.

[0034] The second embodiment of this utility model is described below. Figure 1 As shown, a wheel 4 is provided on the side of the base plate 9 away from the ball outlet window 101, and a support foot 5 is installed on the other side of the base plate 9 protruding downwards. A telescopic handle 3 is provided on the outer wall of the housing 1 on the side away from the ball outlet window 101. In use, the tennis ball serving machine can be moved to the desired position by pulling the telescopic handle 3 at an angle. The support foot 5 can prevent the tennis ball serving machine from moving during the serving process.

[0035] This invention reduces the space occupied by the tennis ball serving machine by making the foldable ball basket 2 foldable, making it easier to move and store the tennis ball serving machine. In use, by rotating the ball feeding mechanism, the tennis balls to be launched can be stored in multiple ball guide holes 701 on the ball feeding plate 7. During the rotation of the ball feeding machine, the tennis balls in the ball feeding plate 7 are sequentially fed into the ball inlet hole 6011, preventing the tennis ball serving machine from changing its serving frequency due to the tennis balls not being fed into the ball inlet hole 6011 in time during the launch. The launching angle and launching direction of the serving mechanism 10 can be automatically adjusted by the elevation adjustment mechanism and the left and right adjustment structure.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A tennis ball serving machine, comprising a shell (1), an upper fixed plate (6) fixedly installed at the top of the shell (1), a bottom plate (9) fixedly installed at the bottom of the shell (1), a cylindrical ball inlet slot (601) protruding downwardly and arranged at the center position of the upper fixed plate (6), and a ball inlet hole (6011) penetratingly arranged at the bottom of the ball inlet slot (601), characterized in that, The upper fixed plate (6) is provided with a folding basket (2) for storing multiple tennis balls, a rotating ball feeding mechanism is arranged in the ball inlet hole (6011), the tennis balls in the folding basket (2) are sequentially fed into the ball inlet hole (6011) by the rotating ball feeding mechanism, the mounting plate (19) is rotatably installed on the upper surface of the bottom plate (9), the fixed side plate (14) is fixedly installed on the upper portion of the mounting plate (19), the automatic ball feeding mechanism (10) is rotatably arranged on one side end of the fixed side plate (14), the ball outlet window (101) is arranged on the surface of the shell (1) corresponding to the automatic ball feeding mechanism (10), the elevation angle adjusting mechanism for adjusting the elevation angle of the ball feeding is arranged between the fixed side plate (14) and the automatic ball feeding mechanism (10), and the left-right adjusting structure for adjusting the left-right direction of the automatic ball feeding mechanism (10) is arranged between the mounting plate (19) and the bottom plate (9).

2. A tennis ball serving machine according to claim 1, wherein The guide plate (8) for guiding the tennis balls into the automatic ball feeding mechanism (10) is arranged between the upper fixed plate (6) and the automatic ball feeding mechanism (10), the bottom window (902) is arranged in the bottom plate (9) corresponding to the automatic ball feeding mechanism (10), the bottom of the automatic ball feeding mechanism (10) extends into the bottom window (902), and the protective cover (903) is fixedly installed downwardly protruding on the bottom of the bottom window (902).

3. A tennis ball serving machine according to claim 2, wherein The folding basket (2) includes two first baffles (201) mirror-imaged arranged on the top of the upper fixed plate (6) and two second baffles (202) mirror-imaged arranged on the top of the upper fixed plate (6), the corner-shaped mounting blocks (602) are upwardly protruding arranged on the top of the upper fixed plate (6) at four corner positions, the first baffles (201) and the second baffles (202) are rotatably connected with the corner-shaped mounting blocks (602) to be upwardly flipped, the first baffles (201) and the second baffles (202) are upwardly rotated on the corner-shaped mounting blocks (602) to form a square folding basket (2) on the top of the upper fixed plate (6).

4. A tennis ball serving machine according to claim 3, wherein The rotating ball feeding mechanism comprises a ball feeding disc (7) rotatably arranged in the ball inlet slot (601), a plurality of ball guide holes (701) are uniformly arranged on the surface of the ball feeding disc (7), a rod (702) for preventing the mutual jamming of the plurality of tennis balls is fixedly arranged at the center of the top of the ball feeding disc (7), the rod (702) is arranged between two adjacent ball guide holes (701), a rotary motor (20) for driving the rotation of the ball feeding disc (7) is fixedly installed at the bottom of the ball inlet slot (601), the ball feeding disc (7) is driven to rotate by the rotary motor (20), so that the plurality of ball guide holes (701) on the ball feeding disc (7) are respectively aligned with the ball inlet holes (6011), an infrared sensor (21) is arranged on the ball inlet slot (601), the infrared sensor (21) is located at the side of the ball inlet hole (6011), a ball blocking structure for preventing the plurality of tennis balls from falling into the ball inlet hole (6011) at the same time is arranged on the upper portion of the upper fixed plate (6), the ball blocking structure is a baffle (603), the baffle (603) is fixedly installed at the position corresponding to the ball inlet hole (6011) on the upper portion of the upper fixed plate (6), and the ball feeding disc (7) is rotatably arranged at the bottom of the baffle (603).

5. A tennis ball serving machine according to claim 4, wherein The automatic ball feeding mechanism (10) comprises a ball feeding wheel (11), a ball feeding motor mounting plate (12) and a ball feeding motor (13), the ball feeding motor mounting plate (12) is rotatably installed at one end of the fixed side plate (14), the ball feeding wheels (11) are rotatably installed at the upper and lower ends of the ball feeding motor mounting plate (12), respectively, a ball feeding channel is arranged between the two ball feeding wheels (11), the ball feeding motor (13) for driving the rotation of the two ball feeding wheels (11) towards the ball feeding channel is fixedly installed at the side of the ball feeding motor mounting plate (12), and the squeezing force of the two ball feeding wheels (11) causes the tennis ball to fly outwards through the ball feeding channel.

6. A tennis ball serving machine according to claim 5, wherein The elevation angle adjusting mechanism comprises an elevation angle adjusting motor (17), a first eccentric block (15) and a rocker arm (16), the elevation angle adjusting motor (17) is fixedly installed at the side of the fixed side plate (14) away from the ball feeding motor mounting plate (12), the transmission shaft of the elevation angle adjusting motor (17) penetrates through the fixed side plate (14) and is fixedly provided with the first eccentric block (15) at the end thereof, one end of the first eccentric block (15) is fixedly connected with the transmission shaft of the elevation angle adjusting motor (17), and the other end is rotatably connected with one end of the rocker arm (16), and the end of the rocker arm (16) away from the first eccentric block (15) is rotatably connected with the bottom of the ball feeding motor mounting plate (12).

7. A tennis ball serving machine according to claim 6, wherein The left-right adjusting structure comprises a left-right adjusting motor (18) and an eccentric slide (901), the left-right adjusting motor (18) is fixedly installed on the upper surface of the mounting plate (19) near the side of the elevation adjusting motor (17), the eccentric slide (901) is formed in the bottom plate (9) at a position corresponding to the left-right adjusting motor (18), the eccentric slide (901) is an elongated circular hole, a second eccentric block is fixedly installed on the end of the transmission shaft in the left-right adjusting motor (18), one end of the second eccentric block is fixedly connected with the transmission shaft in the left-right adjusting motor (18), and the other end extends downward and has a connecting shaft which is rotatably arranged in the eccentric slide (901).

8. A tennis ball serving machine according to claim 1, wherein, A wheel (4) is arranged on the side end of the bottom plate (9) away from the ball outlet window (101), a supporting leg (5) is downwardly protrudingly arranged on the other side end of the bottom plate (9), and a telescopic handle (3) is arranged on the outer wall of the shell (1) away from the ball outlet window (101).

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