A table tennis ball serving device

Abstract

This invention belongs to the field of sports training equipment and discloses a table tennis ball serving device, including a ball collecting container, a ball feeding assembly, a ball striking unit, and a device base coupled in sequence. The ball collecting container is used to hold training table tennis balls; the ball feeding assembly is used to transport the training table tennis balls from the ball collecting container to the ball striking unit; the ball striking unit is used to strike and launch the training table tennis balls falling from the ball feeding assembly. The ball feeding assembly includes a ball feeding channel and a ball feeding crank. The passing area of ​​the ball feeding channel is larger than the large circle of the training table tennis ball. The ball feeding crank is vertically rotatable and has two ball-blocking protrusions formed on it inside the ball feeding channel. The plane where the extension axis of the two ball-blocking protrusions is located is inclined relative to the extension direction of the ball feeding channel, and the vertical spacing of the two ball-blocking protrusions matches the diameter of the training table tennis ball. The first ball-passing distance and the second ball-passing distance between the edges of the two ball-blocking protrusions and the inner wall of the ball feeding channel are greater than and less than the diameter of the training table tennis ball, respectively.

Description

Technical Field

[0001] This invention belongs to the field of sports training equipment, specifically relating to a table tennis ball serving device. Background Technology

[0002] A table tennis serving device is a sports training instrument that can hold multiple training table tennis balls and hit them out in sequence to simulate a player's serve. It is also a device for exercise and entertainment for the general public. As my country is a major table tennis country, the enthusiasm of the general public for participating in table tennis is very high. Therefore, table tennis serving devices have a very broad application prospect in my country.

[0003] Currently, the table tennis ball serving device draws training table tennis balls from bottom to top using a suction method, distributes the training table tennis balls one by one through a rotating turntable, and throws them out through high-speed rollers, thus realizing the function of serving training table tennis balls.

[0004] However, during use, the following shortcomings were found in the above implementation: First, the ball distribution of the rotating turntable is prone to jamming, which can also lead to the ball distribution not being smooth, thus affecting the user's swing rhythm and greatly reducing the user's experience; Second, the serving effect is monotonous, that is, it is difficult to simulate different ball speeds, different spins and different paths in reality, thus affecting the user's enjoyment of the game and greatly reducing the user's experience. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a table tennis ball serving device that can replace the rotating turntable for ball distribution with a simple mechanism, avoiding ball jamming during ball distribution and ensuring smooth ball distribution, thereby greatly improving the user experience.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A table tennis ball serving device, horizontally placed, is characterized by comprising, from top to bottom, a ball collecting container, a ball feeding assembly, a ball striking unit, and a device base coupled together. The ball collecting container holds training table tennis balls; the ball feeding assembly transports the training table tennis balls from the ball collecting container to the ball striking unit; the ball striking unit is rotatably mounted on the device base. The ball feeding assembly includes a ball feeding channel and a ball feeding crank. The ball feeding channel extends toward the ball striking unit and is open at both ends, with a passing area larger than the large circle of the training table tennis ball. The ball feeding crank is rotatably mounted vertically relative to the ball feeding channel, and a [missing information - likely a design element or feature] is formed on the ball feeding crank. Two ball-blocking protrusions extend horizontally and are located inside the ball delivery channel. The plane containing the extension axes of the two ball-blocking protrusions is inclined relative to the extension direction of the ball delivery channel. The vertical spacing between the two ball-blocking protrusions matches the diameter of the training ping-pong ball. The maximum distance between the edges of the two ball-blocking protrusions and the inner wall of the ball delivery channel is used as the first ball-passing distance and the second ball-passing distance, respectively. The first ball-passing distance and the second ball-passing distance are greater than and less than the diameter of the training ping-pong ball, respectively. The hitting unit includes a hitting rod, which is horizontally movable and used to strike and launch the training ping-pong ball falling from the ball delivery channel.

[0008] Preferably, the ball feeding assembly further includes a ball dispensing motor and a ball dispensing crank. The ball feeding channel is formed by two parallel ball feeding baffles. The output shaft of the ball dispensing motor is parallel to the rotation axis of the ball feeding crank. The ball dispensing crank is mounted on the output shaft of the ball dispensing motor. The ball feeding crank is flat and the ball feeding crank and the ball dispensing crank are located in the same vertical plane. Taking the plane as the linkage plane, the minimum distance between the output shaft of the ball dispensing motor and the edge of the ball feeding crank in the linkage plane is less than the extension length of the ball dispensing crank in the linkage plane.

[0009] Preferably, the striking unit includes a striking assembly, which includes a horizontally extending guide rail, a drive gear, and a striking rod movably disposed on the guide rail. The striking rod has a rack segment extending horizontally. The drive gear is a non-perfect gear and meshes with the rack segment. The guide rail has an elastic fixing portion and a limiting portion located near the elastic fixing portion. The striking rod has an elastic expansion portion. The elastic fixing portion and the elastic expansion portion are elastically connected in a resettable manner through an elastic connector. Both the limiting portion and the elastic expansion portion are protrusion structures, and the limiting portion and the elastic expansion portion correspond to each other in the extending direction of the guide rail.

[0010] Furthermore, there are multiple drive gears, and the tooth segments of the multiple drive gears correspond to different envelope angles.

[0011] Furthermore, the ball-hitting assembly also includes a motor mounting base, a gear motor, and a movable gear shaft. The gear motor is mounted on the motor mounting base, and the output shaft of the gear motor is perpendicular to the extension direction of the guide rail. The movable gear shaft is a common shaft for multiple drive gears, and the movable gear shaft is coaxially and movably connected to the output shaft of the gear motor via a coupling.

[0012] Furthermore, the striking unit also includes a ball receiving component, which is adjacent to the end of the guide rail near the limiting part. The ball receiving component has a ball receiving surface, which is located directly below the opening of the ball delivery channel. The ball receiving surface is continuous with the guide rail and extends in the same direction.

[0013] Furthermore, the ball-bearing surface is an inwardly concave arc surface along its own extension direction, and the ball-bearing surface is inclined downward toward the guide track. The ball-bearing component also has two vertical and parallel ball-blocking rods, which are located at the intersection of the ball-bearing surface and the guide track, and the distance between the two ball-blocking rods is smaller than the diameter of the training ping-pong ball.

[0014] Furthermore, the ball-hitting unit also includes a deflection assembly, which includes a drive rotating ball guide tube and a ball tube drive rod. The rotating ball guide tube and the ball-hitting track are located on both sides of the ball-receiving component. The rotating ball guide tube is rotatably arranged along its own circumference and has a ball-hitting inlet and a ball-hitting outlet. The ball-hitting inlet is adjacent to the ball-receiving component and its orientation is the extension direction of the ball-receiving surface. The ball-hitting outlet faces the outside of the table tennis serving device. Friction deflection pads are attached to the inner wall of the rotating ball guide tube, and a circular, continuously closed toothed ring is formed on the outer circumferential surface of the rotating ball guide tube. One end of the ball tube drive rod has a drive gear that meshes with the toothed ring.

[0015] Furthermore, one end of the ball cylinder drive rod has a rotating lever, which drives the drive gear to rotate, thereby causing the rotating ball cylinder to rotate. The rotating lever also has multiple deflection position markings along its circumference.

[0016] Preferably, the present invention further includes a device base shell, which is connected to the ball collecting container, and the ball feeding assembly and the ball striking unit are both located inside the device shell. The swing assembly includes a geared motor, a drive linkage chain, and a rotary coupling component. The geared motor is mounted on the device base, the rotary coupling component is mounted on the device shell, one end of the drive linkage chain is mounted on the output end of the geared motor, and the other end is mounted on the rotary coupling component and located on the vertical central axis of the rotary coupling component. The drive linkage chain consists of three links with their ends hinged sequentially, and all three links extend horizontally. The geared motor drives the rotary coupling component to rotate through the drive linkage chain, thereby causing the device base shell to rotate horizontally relative to the device base.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The table tennis serving device of the present invention includes a ball collecting container, a ball feeding assembly, a ball striking unit, and a device base coupled in sequence. The ball collecting container is used to hold training table tennis balls; the ball feeding assembly is used to transport training table tennis balls from the ball collecting container to the ball striking unit; the ball striking unit is used to strike and launch training table tennis balls falling from the ball feeding assembly. The ball feeding assembly includes a ball feeding channel and a ball feeding crank. The passing area of ​​the ball feeding channel is larger than the great circle of the training table tennis ball. The ball feeding crank is vertically rotatable and has two ball-blocking protrusions formed on it inside the ball feeding channel. The plane of the extension axis of the two ball-blocking protrusions is inclined relative to the extension direction of the ball feeding channel, and the vertical spacing of the two ball-blocking protrusions matches the diameter of the training table tennis ball. The first ball-passing distance and the second ball-passing distance between the edges of the two ball-blocking protrusions and the inner wall of the ball feeding channel are greater than and less than the diameter of the training table tennis ball, respectively. When the first ball-passing distance is greater than the diameter of the training table tennis ball, the second ball-passing distance is less than the diameter of the training table tennis ball. At this time, the training table tennis ball in the ball feeding channel... The ping-pong ball cannot pass through the second ball-passing distance and falls between the vertical gaps of the two ball-blocking protrusions, preventing it from falling further. When the second ball-passing distance is greater than the diameter of the training ping-pong ball, and the first ball-passing distance is less than the diameter of the training ping-pong ball, only the training ping-pong ball that falls between the vertical gaps of the two ball-blocking protrusions continues to fall to the hitting unit. Meanwhile, another training ping-pong ball immediately above it is blocked by the ball-blocking protrusions and cannot enter the vertical gap between the two ball-blocking protrusions. Thus, due to the spatial constraints of the first ball-passing distance, the second ball-passing distance, and the vertical gaps of the two ball-blocking protrusions, the training ping-pong balls fall smoothly and sequentially from the ball-feeding channel to the hitting unit. Therefore, this invention can replace the rotary table for ball distribution by using a ball-feeding crank with two ball-blocking protrusions and a ball-feeding channel with adjustable cross-section or intervals through the ball-blocking protrusions, avoiding the occurrence of ball jamming during ball distribution and ensuring smooth ball distribution, thereby greatly improving the user experience.

[0019] 2. Because the ball-hitting assembly of the present invention includes a guide rail, a drive gear, and a hitting rod, the hitting rod has a rack segment, the drive gear is a non-full gear and meshes with the rack segment, and the guide rail and the hitting rod are elastically connected in a resettable manner through an elastic connector, that is, the hitting rod and the guide rail are elastically separated, and the elastic separation is generated and maintained by the meshing of the toothed part of the non-full gear. The elastic restoring force generated by the elastic separation is released by the release meshing of the toothless part of the non-full gear, and is converted into the hitting power of the hitting rod on the training ping-pong ball. Therefore, the ball-hitting mechanism of the present invention is simple in setting, the impact force is stable and reliable, and the hitting trajectory of the training ping-pong ball can be strictly maintained in accordance with the expected trajectory.

[0020] 3. Because the present invention has multiple drive gears, and the tooth segments of the multiple drive gears correspond to different envelope angles, the meshing lengths of the multiple drive gears and the rack segments are different, resulting in different elastic extension lengths of the striking rod relative to the guide rail, and different striking forces of the striking rod on the training ping-pong ball when the elasticity is released. Therefore, the present invention can conveniently adjust the initial acceleration of the training ping-pong ball.

[0021] 4. Because the ball-receiving surface of the present invention is an inwardly concave arc surface along its own extension direction, and the ball-receiving surface is inclined downward toward the guide track, the ball-receiving component also has two vertical and parallel ball-blocking rods. The ball-blocking rods are located at the intersection of the ball-receiving surface and the guide track, and the distance between the two ball-blocking rods is less than the diameter of the training ping-pong ball. The training ping-pong ball falling from the ball delivery channel falls onto the ball-receiving surface and rolls along the inwardly concave arc surface to the ball-blocking rod, where it is stopped by the ball-blocking rod. Therefore, the present invention can stably and reliably stop the training ping-pong ball at the ball-blocking rod, thereby facilitating the hitting of the ball by the striking rod.

[0022] 5. Because the deflection assembly of the present invention includes a drive rotating ball guide tube and a ball tube drive rod, the rotating ball guide tube is rotatably arranged and has a hitting inlet and a hitting outlet. The hitting inlet is adjacent to the ball receiving member. A friction deflection patch is attached to the inner wall of the rotating ball guide tube, and a circular, continuously closed toothed ring is formed on the outer circumferential surface of the rotating ball guide tube. The ball tube drive rod has a drive gear that meshes with the toothed ring. When the training ping-pong ball is hit, the training ping-pong ball is launched outward through the rotating ball guide tube. During the launch process, the training ping-pong ball passes through the friction deflection patch. The friction deflection patch applies a deflection torque to the training ping-pong ball through the friction force with the surface of the training ping-pong ball. Therefore, the present invention can apply a deflection torque to the training ping-pong ball, thereby simulating the different angles of the slicing serve by the ping-pong server, and further improving the user experience.

[0023] 6. Because the present invention also includes a device base shell and a rocking assembly, the rocking assembly includes a geared motor, a drive linkage chain, and a rotary coupling component. One end of the drive linkage chain is located at the output end of the geared motor, and the other end is located on the rotary coupling component. The drive linkage chain consists of three links with their ends hinged sequentially. The geared motor drives the rotary coupling component to rotate through the drive linkage chain to form a crank-rocker mechanism, thereby causing the device base shell to rotate horizontally relative to the device base. Therefore, the present invention can make the serving direction continuously change within a certain angle range, that is, simulate the varied serving trajectories of a table tennis server, thereby greatly enhancing the competitive fun of the use process and further improving the user experience. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a table tennis serving device according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the device base shell in this embodiment. Figure 1 ;

[0026] Figure 3 This is a schematic diagram of the device base shell in this embodiment. Figure 2 ;

[0027] Figure 4 This is a schematic diagram of the ball delivery assembly in this embodiment (the obstruction structure is omitted).

[0028] Figure 5 This is a schematic diagram of the striking assembly in this embodiment;

[0029] Figure 6 for Figure 5 Exploded view;

[0030] Figure 7 This is a schematic diagram of a movable gear shaft;

[0031] Figure 8 This is a schematic diagram of a mobile connecting sleeve;

[0032] Figure 9a A schematic diagram of a single-headed V-shaped spring buckle;

[0033] Figure 9b A schematic diagram showing the fit of a single-headed V-shaped spring clip, a movable gear shaft, and a movable connecting sleeve;

[0034] Figure 10 This is a schematic diagram of the device base shell and the ball bearing component in this embodiment;

[0035] Figure 11 This is a schematic diagram of the deflection component in this embodiment;

[0036] Figure 12 This is a schematic diagram of a swing assembly according to an embodiment of the present invention;

[0037] Figure 13 for Figure 12 A sectional view.

[0038] In the diagram: 100, Table tennis ball serving device; 10, Shell assembly; 11, Ball collecting container; 12, Ball drop channel; 121, Shielding structure; 13, Device base shell; 14, Coupling outer cylinder; 15, Device base; T, Training table tennis ball; 20, Ball feeding assembly; 21, Ball feeding channel; 21a, Ball feeding partition; 22, Ball feeding crank; 221, Ball blocking protrusion; 23, Ball distributing motor; 24, Ball distributing crank; 30, Ball striking unit; 31, Ball striking assembly; 311, Guide rail; 3111, Elastic fixing part; 3112, Limiting part; 312, Ball striking rod; 312a, Rack segment; 3121, Elastic expansion part; 313, Motor mounting base; 315, Drive gear; 3 17. Movable gear shaft; 3171. Stop through hole; C. Coupling; 318. Moving connecting sleeve; 3181. Positioning through hole; V. Single-headed V-shaped spring buckle; 319. Gear tie rod; 32. Ball bearing component; 321. Ball bearing surface; 322. Ball blocking rod; 33. Deflection assembly; 331. Rotating ball guide tube; 331a. Ball inlet; 331b. Ball outlet; 3311. Friction deflection patch; 3312. Gear ring; 332. Ball tube drive rod; 3321. Rotating lever; 3321a. Deflection position indicator; 3322. Drive gear; 40. Swing assembly; 41. Gear motor; 42. Drive linkage chain; 43. Rotational coupling component; 431. Rotating central shaft. Detailed Implementation

[0039] To make the technical means, creative features, objectives and effects of the present invention easier to understand, the following embodiments, in conjunction with the accompanying drawings, provide a detailed description of the table tennis serving device of the present invention. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0040] like Figure 1 As shown, the table tennis serving device 100 in this embodiment is placed horizontally and is used to simulate a table tennis server serving the ball, so that the user can train or play by receiving the ball. It includes a housing assembly 10, a ball delivery assembly 20, a hitting unit 30, and a swing assembly 40.

[0041] The housing assembly 10 includes a ball collecting container 11, a device base shell 13, and a device base 15. The ball collecting container 11 is used to hold training ping-pong balls. The upper end of the device base shell 13 is connected to the ball collecting container 11, and the lower end of the device base shell 13 is located at the upper end of the device base 15. The ball feeding assembly 20 and the ball hitting unit 30 are both located inside the device housing 13, so that the ball collecting container 11, the ball feeding assembly 20, the ball hitting unit 30, and the device base 15 are coupled sequentially from top to bottom. Specifically, the housing assembly 10 includes a ball collecting container 11, a ball dropping pipe 12, a device base shell 13, a coupling outer cylinder 14, and a device base 15. In this embodiment, the bottom surface of the inner cavity of the ball collecting container 11 is inclined downwards, the ball dropping pipe 12 is vertically arranged and its upper opening is connected to the lowest position of the bottom surface of the inner cavity of the ball collecting container 11, and its lower end is connected to the upper part of the device base shell 13.

[0042] like Figures 2 to 4 As shown, the ball feeding assembly 20 is used to transport training ping-pong balls T from the ball collection container 11 to the ball hitting unit 30. The ball feeding assembly 20 includes a ball feeding channel 21, a ball feeding crank 22, a ball distributing motor 23, and a ball distributing crank 24.

[0043] The ball delivery channel 21 extends toward the hitting unit 30 and is open at both ends. The passing area, i.e., the cross-section, of the ball delivery channel 21 is larger than the large circle of the training ping-pong ball T. Specifically, the ball delivery channel 21 is formed by two parallel ball delivery partitions 21a that extend vertically, so that the ball delivery channel 21 extends vertically.

[0044] The ball-feeding crank 22 is vertically rotatable relative to the ball-feeding channel 21. The ball-feeding crank 22 is flat and has two ball-blocking protrusions 221 formed on it. Both ball-blocking protrusions 221 extend horizontally and are located inside the ball-feeding channel 21. The plane containing the extension axes of the two ball-blocking protrusions 221 is inclined relative to the extension direction of the ball-feeding channel 21, and the vertical spacing of the two ball-blocking protrusions 221 matches the diameter of the training ping-pong ball T. The maximum distance between the edges of the two ball-blocking protrusions 221 and the inner wall of the ball-feeding channel 21 is taken as the first ball-passing distance and the second ball-passing distance, respectively. The first ball-passing distance and the second ball-passing distance are greater than and less than the diameter of the training ping-pong ball T, respectively. Specifically, the ball-feeding... The crank 22 is adjacent to the two ball feed baffles 21a on the same side, thereby closing one end of the ball feed channel 21. The ball blocking protrusion 221 is rod-shaped, and its extension direction is perpendicular to the surface of the ball feed crank 22. The ball blocking protrusion 221 divides the relative distance between the two ball feed baffles 21a into two intervals, the larger of which is the first ball passage distance and the second ball passage distance. The rotation amplitude of the ball feed crank 22 is limited by the interference between the two ball feed baffles 21a and the corresponding ball blocking protrusion 221. That is, when a ball blocking protrusion 221 stops interfering with the corresponding adjacent ball feed baffle 21a, the rotation limit position on one side of the corresponding ball feed crank 22 is reached. Thus, when the ball feed crank 22 rotates... During operation, the magnitudes of the first and second ball-passing distances change in opposite directions, resulting in the first and second ball-passing distances being greater than and less than the diameter of the training ping-pong ball T, respectively. Furthermore, the changes in the magnitude of the first and second ball-passing distances affect the opening of the ball-feeding channel 21 or the closing of the ball-feeding channel 21 to prevent the training ping-pong ball T from passing through. Specifically, when the first ball-passing distance is greater than the diameter of the training ping-pong ball T, the second ball-passing distance is less than the diameter of the training ping-pong ball T. In this case, the training ping-pong ball T within the ball-feeding channel 21 cannot pass through the second ball-passing distance and falls between the vertical gaps of the two ball-blocking protrusions 221, preventing it from falling further. When the ball-feeding crank 22 moves in conjunction with... During the aforementioned reverse rotation, the second ball-passing distance is greater than the diameter of the training ping-pong ball T, and the first ball-passing distance is less than the diameter of the training ping-pong ball T. At this time, because the first ball-passing distance is less than the diameter of the training ping-pong ball T, the training ping-pong ball T that only falls between the vertical gaps of the two ball-blocking protrusions 221 continues to fall to the hitting unit 30. Meanwhile, the other training ping-pong ball T, which is adjacent to it, is blocked by the upper ball-blocking protrusion 221 and cannot enter between the vertical gaps of the two ball-blocking protrusions 221. Thus, due to the spatial constraints of the first ball-passing distance, the second ball-passing distance, and the vertical gaps of the two ball-blocking protrusions 221, the training ping-pong balls T fall smoothly into the hitting unit 30 through the ball-feeding channel 21 in sequence.

[0045] The ball-distributing motor 23 is located near the ball-feeding crank 22, and the output shaft of the ball-distributing motor 23 is parallel to the rotation axis of the ball-feeding crank 22.

[0046] The ball-distributing crank 24 is mounted on the output shaft of the ball-distributing motor 23, and the ball-distributing crank 24 and the ball-feeding crank 22 are located in the same vertical plane. This vertical plane is taken as the linkage plane. The minimum distance between the output shaft of the ball-distributing motor 23 and the edge of the ball-feeding crank 22 in the linkage plane is less than the extension length of the ball-distributing crank 24 in the linkage plane. Specifically, the rotation plane of the ball-distributing crank 24 is coplanar with the rotation plane of the ball-feeding crank 22. The free end of the ball-distributing crank 24 interferes with the edge of the ball-feeding crank 22 discontinuously and periodically during rotation, thereby making the ball-feeding crank 22 non-... The ball-distributing crank 24 is continuously and periodically pushed to rotate, so that when the ball-distributing crank 24 pushes the ball-feeding crank 22 to rotate, the first ball-passing distance and the second ball-passing distance change in opposite directions; when the ball-distributing crank 24 does not push the ball-feeding crank 22 to rotate, the ball-feeding crank 22 rotates in the opposite direction due to gravity, so that the first ball-passing distance and the second ball-passing distance change in the opposite direction to the above; so that when the ball-distributing crank 24 rotates one revolution, only one training ping-pong ball T falls into the hitting unit 30 through the ball-feeding channel 21. In this embodiment, the ball-distributing crank 24 is rod-shaped.

[0047] The hitting unit 30 is rotatably mounted on the device base 15. The hitting unit 30 includes a hitting assembly 31, a ball receiving component 32, and a deflection assembly 33.

[0048] like Figure 5 and Figure 6 As shown, the ball-hitting assembly 31 includes a guide rail 311, a ball-hitting rod 312, a motor mounting base 313, a gear motor (not shown in the figure), a drive gear 315, and an elastic connector (not shown in the figure).

[0049] The guide rail 311 is set on the bottom surface of the device housing 13 and extends horizontally. The striking rod 312 is horizontally movable on the guide rail 311 through a concave-convex fit. The striking rod 312 has a rack segment 312a that extends horizontally for striking and launching a training ping-pong ball falling from the ball delivery channel.

[0050] The guide rail 311 has an elastic fixing part 3111 and a limiting part 3112 located near the elastic fixing part 3111. The striking rod 312 has an elastic expansion part 3121. The elastic fixing part 3111 and the elastic expansion part 3121 are elastically connected in a resettable manner through an elastic connector 315. Both the limiting part 3112 and the elastic expansion part 3121 are protrusion structures, and the limiting part 3112 and the elastic expansion part 3121 correspond to each other in the extension direction of the guide rail 311. Specifically, when the striking rod 312 moves on the guide rail 311, the limiting part 3112 is used to limit the striking rod 312.

[0051] The gear motor is mounted on the motor mounting base 313. The output shaft of the gear motor is perpendicular to the extension direction of the guide rail 311. There are multiple drive gears 315, which are coaxially arranged. The movable gear shaft 317 is a common shaft for multiple drive gears 315. The movable gear shaft 317 is coaxially and movably connected to the output shaft of the gear motor through a coupling C. The drive gears 315 are incomplete gears that mesh with the rack segment 312a. The tooth segments of multiple drive gears 315 have different envelope angles, that is, the meshing length between each drive gear 315 and the rack segment 312a is different.

[0052] Specifically, such as Figures 7 to 9b As shown, the ball-hitting assembly 31 also includes a movable connecting sleeve 318 and a gear rod 319. The movable connecting sleeve 318 is hollow, with one end coaxially fixed to the coupling C, and a movable gear shaft 317 inserted at the other end. Thus, the coupling C is connected to the movable gear shaft 317 through the movable connecting sleeve 318. The end of the movable gear shaft 317 inserted into the movable connecting sleeve 318 serves as the coupling end. The coupling end is hollow and has a stop hole 3171 circumferentially arranged. A single-headed V-shaped spring buckle V with its head passing through the stop hole 3171 is provided inside the coupling end. The movable connecting sleeve 318 has multiple positioning holes 3181 circumferentially arranged, corresponding to the stop hole 3171. When the movable gear shaft 317 moves linearly within the movable connecting sleeve 318, and the positioning holes 3181 and the stop hole 3171 coincide, the head of the single-headed V-shaped spring buckle V simultaneously passes through the positioning holes 3181 and the stop hole 3171. Hole 3171 is provided to fix the movable gear shaft 317 relative to the movable connecting sleeve 318. Multiple positioning through holes 3181 correspond to different fixed positions and different drive gears 315 and rack segments 312a. The end of the movable gear shaft 317 opposite to the coupling end is used as the pulling end. The gear pull rod 319 is fixed on the pulling end. When the movable gear shaft 317 is fixed relative to the movable connecting sleeve 318 and the gear pull rod 319 is pulled with a predetermined force, the smooth contour of the head of the single-headed V-shaped spring clip V slides out from the positioning through hole 3181, so that the movable gear shaft 317 continues to move linearly within the inserted movable connecting sleeve 318. In addition, the device housing 13 has an openable and closable housing side cover (not shown in the figure). Relevant personnel can operate the gear pull rod 319 by opening the housing side cover, thereby replacing the drive gear 315 that cooperates with the rack segment 312a.

[0053] Specifically, one end of the elastic connector is mounted on the striking rod 312 via an elastic expansion portion 3121, and the other end is mounted on the guide rail 311 via an elastic fixing portion 3111. The striking rod 312 and the guide rail 311 are elastically separated by the elastic connector. This elastic separation is generated and maintained by the meshing of the toothed portion of the drive gear 315. The elastic restoring force generated by the elastic separation is released by the release meshing of the toothless portion of the drive gear 315, which is converted into the striking force of the striking rod 312 on the training ping-pong ball T. Furthermore, the tooth segments of the multiple drive gears 315 have different envelope angles, resulting in different meshing lengths between the multiple drive gears 315 and the rack segment 312a. This leads to different elastic extension lengths of the striking rod 312 relative to the guide rail 311, and different striking forces of the striking rod 312 on the training ping-pong ball T during elastic release, i.e., different initial accelerations applied to the training ping-pong ball T.

[0054] like Figure 10 As shown, the ball receiving member 32 is disposed on the bottom surface of the device base shell 13. The ball receiving member 32 is adjacent to the end of the guide rail 311 and close to the limiting part 3112. The ball receiving member 32 has a ball receiving surface 321 and a ball blocking rod 322. Specifically, the ball receiving member 32 is a rectangular solid extending towards the guide rail 311, and when the ball striking rod 312 moves, it does not interfere with the ball receiving member 32.

[0055] The ball bearing surface 321 is located directly below the opening of the ball delivery channel 21. The ball bearing surface 321 is continuous with the ball guide rail 311 and extends in the same direction. The ball bearing surface 321 is an arc surface that is concave inward along its own extension direction, and the ball bearing surface 321 is inclined downward toward the ball guide rail 312.

[0056] There are two blocking rods 322, which are vertically parallel and located at the intersection of the ball-bearing surface 321 and the guide rail 311. The distance between the two blocking rods 322 is less than the diameter of the training ping-pong ball T. The training ping-pong ball T, falling from the ball-feeding channel 21, lands on the ball-bearing surface 321 and rolls along the concave arc surface between the two blocking rods 322, where it is stopped by the blocking rods 322. At this time, the center of the training ping-pong ball T is located on the extended axis of the striking rod 312. Specifically, as shown... Figure 8 As shown, the ball drop channel 12 extends all the way to the ball receiving surface 321. The sides of the ball drop channel 12 are blocked by the blocking structure 121 and the ball feeding crank 22. The gap between the lower edge of the blocking structure 121 and the upper end of the ball blocking rod 322 is smaller than the large circle of the training ping-pong ball T. This allows the training ping-pong ball T to fall directly onto the ball receiving surface 321 through the ball feeding channel 21 via the ball drop channel 12 without detaching from the ball feeding channel 21 during the process. In this embodiment, the blocking structure 121 is a mesh plate that does not affect the observation of the internal situation of the ball drop channel 12.

[0057] like Figure 11 As shown, the deflection assembly 33 includes a drive rotating ball guide cylinder 331 and a ball cylinder drive rod 332, and the rotating ball guide cylinder 332 and the guide rail 311 are located on both sides of the length direction of the ball receiving member 32.

[0058] The rotating ball guide tube 331 is rotatably arranged along its own circumference and has a ball inlet 331a, a ball outlet 331b, a friction deflection patch 3311, and a toothed ring portion 3312. Specifically, the cross section of the rotating ball guide tube 331 is circular and matches the training ping-pong ball T. In this embodiment, the rotating ball guide tube 331 is a straight tube.

[0059] The ball-hitting inlet 331a is adjacent to the ball-receiving member 32 and the ball-hitting inlet 331a is oriented in the extension direction of the ball-receiving surface 32. The ball-hitting outlet 331b faces the outside of the table tennis ball-serving device 100. Specifically, the ball-hitting outlet 331b is located on the surface of the device base shell 13.

[0060] The friction deflection patch 3311 is a piece with a high coefficient of friction with the ping-pong ball. It is attached to the inner wall of the rotating ball guide tube 331. Specifically, the friction deflection patch 3311 occupies less than or equal to 1 / 8 of the circumference of the inner wall of the rotating ball guide tube 331. When the training ping-pong ball T is hit, the training ping-pong ball T is launched outward through the rotating ball guide tube 311. During the launch process, the training ping-pong ball T passes through the friction deflection patch 3311. The friction deflection patch 3311 applies a deflection torque to the training ping-pong ball T through the friction with the surface of the training ping-pong ball T, thereby making the hit training ping-pong ball T have a chopping serve effect.

[0061] The gear ring portion 3312 is formed on the outer peripheral surface of the rotating ball guide tube 311 and is arranged in a continuous closed circular configuration along the circumferential direction.

[0062] The two ends of the ball cylinder drive rod 332 have a rotating lever 3321 and a drive gear 3322, respectively.

[0063] The drive gear 3322 meshes with the gear ring 3312. The rotating lever 3321 drives the drive gear 3322 to rotate by external force, thereby causing the rotating ball guide tube 331 to rotate. The rotating lever 3321 has multiple deflection position marks 3321a along its circumference. By rotating the rotating lever 3321 to the corresponding deflection position mark 3321a, the user can make the training ping-pong ball T have different spin patterns and slicing effects.

[0064] like Figure 12 and Figure 13 As shown, the swing assembly 40 includes a geared motor 41, a drive linkage chain 42, and a rotary coupling member 43.

[0065] The geared motor 41 is mounted on the device base 15, the rotary coupling 43 is mounted on the device housing 13, one end of the drive linkage chain 42 is mounted on the output end of the geared motor 41, and the other end is mounted on the rotary coupling 43 and located on the vertical central axis of the rotary coupling 43. The drive linkage chain 42 consists of three links with their ends hinged in sequence, and all three links extend horizontally. The geared motor 41 drives the rotary coupling 43 to rotate through the drive linkage chain 42, that is, the crank rocker mechanism is formed by the rocking assembly 40 of the drive linkage chain 42, so that the device base 13 reciprocates horizontally relative to the device base 15, thereby simulating the serve of a ping-pong ball with frequent changes in line.

[0066] Specifically, the rotary coupling member 43 is provided with a rotary central shaft 431 along its own vertical central axis. The end of the driving link chain 42 is fixedly sleeved on the rotary central shaft 431. Thus, when the end of the driving link chain 42 rotates, the rotary coupling member 43 is driven to rotate and swing through the rotary central shaft 431. The rotary coupling member 43 is rotatably set inside the coupling outer cylinder 14 through bearings, thereby ensuring the axial stability of the rotation of the rotary coupling member 43. Moreover, the coupling outer cylinder 14 also has a certain dustproof effect.

[0067] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications or variations that can be made by those skilled in the art without creative effort within the scope of the appended claims are still within the scope of protection of this patent.

Claims

1. A table tennis ball serving device, placed horizontally, characterized in that, include: The components, coupled from top to bottom, are a ball collecting container, a ball delivery assembly, a ball striking unit, and a device base. The ball-collecting container is used to hold training ping-pong balls; The ball delivery assembly is used to transport the training ping-pong ball from the ball collection container to the hitting unit; the hitting unit is rotatably mounted on the base of the device. The ball delivery assembly includes a ball delivery channel and a ball delivery crank. The ball delivery channel extends toward the hitting unit and is open at both ends. The passing area of ​​the ball delivery channel is larger than the large circle of the training ping-pong ball. The ball-feeding crank is vertically rotatable relative to the ball-feeding channel. Two ball-blocking protrusions are formed on the ball-feeding crank. Both protrusions extend horizontally and are located inside the ball-feeding channel. The plane containing the extension axes of the two protrusions is inclined relative to the extension direction of the ball-feeding channel. The vertical spacing between the two protrusions matches the diameter of the training ping-pong ball. The maximum distance between the edges of the two protrusions and the inner wall of the ball-feeding channel is defined as the first ball-passing distance and the second ball-passing distance, respectively. The first ball-passing distance and the second ball-passing distance are greater than and less than the diameter of the training ping-pong ball, respectively. The striking unit includes a striking rod that is horizontally movable and is used to strike and launch the training ping-pong ball falling from the ball delivery channel. The ball feeding assembly also includes a ball-distributing motor and a ball-distributing crank, and the ball feeding channel is formed by two parallel ball feeding baffles. The output shaft of the ball-distributing motor is parallel to the rotation axis of the ball-feeding crank, and the ball-distributing crank is mounted on the output shaft of the ball-distributing motor. The ball-feeding crank is flat, and the ball-feeding crank and the ball-distributing crank are located in the same vertical plane. This plane is used as the linkage plane. The minimum distance between the output shaft of the ball-distributing motor and the edge of the ball-feeding crank in the linkage plane is less than the extension length of the ball-distributing crank in the linkage plane.

2. The table tennis ball serving device according to claim 1, characterized in that: in, The striking unit includes a striking assembly comprising a horizontally extending guide rail, a drive gear, and a striking rod movably mounted on the guide rail. The striking rod has a horizontally extending rack segment, and the drive gear is a non-perfect gear that meshes with the rack segment. The guide rail has an elastic fixing part and a limiting part located near the elastic fixing part. The striking rod has an elastic expansion part. The elastic fixing part and the elastic expansion part are elastically connected in a resettable manner through an elastic connector. The limiting part and the elastic expansion part are both protrusion structures, and the limiting part and the elastic expansion part correspond to each other in the extension direction of the guide rail.

3. The table tennis ball serving device according to claim 2, characterized in that: in, The number of drive gears is multiple, and the tooth segments of the multiple drive gears correspond to different envelope angles.

4. The table tennis ball serving device according to claim 3, characterized in that: in, The striking assembly also includes a motor mounting base, a geared motor, and a movable gear shaft. The gear motor is mounted on the motor mounting base. The output shaft of the gear motor is perpendicular to the extension direction of the guide rail. The movable gear shaft is a common shaft of the plurality of drive gears. The movable gear shaft is coaxial with the output shaft of the gear motor and is movably connected axially via a coupling.

5. The table tennis ball serving device according to claim 2, characterized in that: in, The striking unit also includes a ball-receiving component, which is adjacent to the end of the guide rail near the limiting portion. The ball-bearing component has a ball-bearing surface. The ball-bearing surface is located directly below the opening of the ball delivery channel, and the ball-bearing surface is continuous with and extends in the same direction as the ball-guided track.

6. The table tennis ball serving device according to claim 5, characterized in that: in, The ball-bearing surface is an inwardly concave arc surface along its own extension direction, and the ball-bearing surface is inclined downward toward the guide track. The ball-bearing component also has two vertical and parallel ball-blocking rods, which are located at the intersection of the ball-bearing surface and the guide track, and the distance between the two ball-blocking rods is smaller than the diameter of the training ping-pong ball.

7. The table tennis ball serving device according to claim 5, characterized in that: in, The striking unit also includes a deflection assembly, which comprises a drive rotating ball guide tube and a ball tube drive rod. The rotating ball guide tube and the hitting track are located on both sides of the ball receiving member. The rotating ball guide tube is rotatably arranged along its own circumference and has a hitting inlet and a hitting outlet. The hitting inlet is adjacent to the ball receiving member and its orientation is the extension direction of the ball receiving surface. The hitting outlet faces outwards from the table tennis serving device. The inner wall of the rotating ball guide tube is provided with a friction deflection patch, and the outer circumferential surface of the rotating ball guide tube is formed with a circular, continuous, closed toothed ring portion along the circumferential direction. One end of the ball tube drive rod has a drive gear that meshes with the toothed ring portion.

8. The table tennis ball serving device according to claim 7, characterized in that: in, One end of the ball cylinder drive rod has a rotating lever, which drives the drive gear to rotate, thereby causing the rotating ball cylinder to rotate. The rotating lever has multiple deflection position markings along its circumference.

9. The table tennis ball serving device according to claim 1, characterized in that, Also includes: The device base shell is connected to the ball collecting container, and both the ball feeding assembly and the ball striking unit are located inside the device base shell. The swing assembly includes a geared motor, a drive linkage chain, and a rotary coupling component. The geared motor is mounted on the device base, and the rotary coupling component is mounted on the device housing. One end of the drive linkage chain is located at the output end of the geared motor, and the other end is located on the rotary coupling component and on its vertical central axis. The drive linkage consists of three links that are hinged at their ends in sequence, and all three links extend horizontally. The geared motor drives the rotary coupling to rotate through the drive linkage, thereby causing the device base shell to rotate horizontally relative to the device base.

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