Backpack portable tennis ball launcher

Abstract

The utility model discloses a backpack portable tennis launcher relates to launcher technical field, wherein, backpack portable tennis launcher includes backpack and launcher main part, and the backpack is opened and has the ball throwing hole and the ball hole, and the launcher main part sets up in the backpack, and the launcher main part includes frame, ball turning disc subassembly and ball throwing subassembly, and the frame is connected with the backpack, and the ball turning disc subassembly is installed in the top of frame, and the ball throwing subassembly includes inlet and outlet, and the ball throwing subassembly is installed in the bottom of frame, and the ball turning disc subassembly is provided with first ball leakage hole, and the tennis can pass through the ball throwing hole, first ball leakage hole, inlet, outlet and ball hole in proper order, through the cloth sewing and make the backpack, and the cloth is covered on the ball throwing hole and the ball hole, and is connected with the backpack through the slide fastener, like this can open or close the ball throwing hole and the ball hole through the slide fastener, only needs through the shoulder strap of backpack, can carry the ball throwing machine on the body, and it is convenient for user to carry the ball throwing machine to any site.

Description

Technical Field

[0001] This utility model relates to the field of ball launching machine technology, and in particular to a backpack-portable tennis launcher. Background Technology

[0002] In tennis training, tennis launchers are commonly used. These launchers automatically launch tennis balls, allowing players to practice without a partner. They can also simulate different serve scenarios by adjusting the launch angle, speed, and spin, thereby helping players improve their return skills, reaction speed, and hitting accuracy.

[0003] In the existing technology, tennis launchers are fixed in place and cannot be stored, making it inconvenient for users to carry the tennis launcher to the court.

[0004] Therefore, it is necessary to provide a new backpack-mounted portable tennis launcher to solve the above-mentioned technical problems. Utility Model Content

[0005] The main purpose of this invention is to propose a portable tennis launcher for backpacks, aiming to improve the technical problem that existing tennis launchers are inconvenient for users to carry.

[0006] To achieve the above objectives, this utility model provides a portable tennis launcher in a backpack, comprising: A backpack, which has a throwing hole and a launching hole; The launcher body is housed inside a backpack. The launcher body includes a frame, a ball-spinning disc assembly, and a ball-launching assembly. The frame is connected to the backpack. The ball-spinning disc assembly is installed on the top of the frame. The ball-serving assembly includes an inlet and an outlet. The ball-serving assembly is installed inside the frame. The ball-spinning disc assembly is provided with a first ball-draining hole. The tennis ball can pass through the ball-throwing hole, the first ball-draining hole, the inlet, the outlet, and the ball-serving hole in sequence.

[0007] In one embodiment, the transmitter body further includes a ball-rotating motor. The ball-rotating disk assembly includes a circular rotating disk and a baffle plate with the first ball-leaking hole. The baffle plate is disposed below the circular rotating disk. The ball-rotating motor is mounted on the frame and is used to drive the circular rotating disk to rotate. The circular rotating disk is provided with a plurality of second ball-leaking holes arranged circumferentially around the center of the circular rotating disk. All of the plurality of second ball-leaking holes can communicate with the first ball-leaking hole.

[0008] In one embodiment, the top of the circular rotating disk is provided with a first rib and a second rib arranged perpendicularly to each other, and both the first rib and the second rib extend along the diameter direction of the circular rotating disk. Both the first rib and the second rib are used to abut against the ball to push the ball into the second ball leakage hole.

[0009] In one embodiment, the serving assembly includes a slide component and a serving component. The slide component includes a slide and side plates formed on both sides of the slide. The slide, the two side plates, and the serving component surround to form the entrance, and the exit is provided at the serving component.

[0010] In one embodiment, the serving component includes two serving wheels and two brushless motors. Both side plates are provided with rotatable adjustment plates. The two brushless motors are mounted on one of the adjustment plates. The motor shafts of the brushless motors pass through the two adjustment plates in sequence. The two serving wheels are sleeved on the motor shafts of the two brushless motors. The two serving wheels surround to form the outlet.

[0011] In one embodiment, the serving component further includes a motor bracket, which includes a bracket mounting plate, a connecting plate, and a motor mounting plate connected in sequence. The bracket mounting plate is mounted on the adjusting plate, and the connecting plate is provided with an elastic bending portion. The brushless motor is mounted on the motor mounting plate.

[0012] In one embodiment, the serving assembly further includes a fixing member and an elastic member. The fixing member is disposed at the end of the output shaft of the brushless motor, and the elastic member is sleeved on the output shaft of the brushless motor. One end of the elastic member abuts against the fixing member, and the other end of the elastic member abuts against the adjusting plate.

[0013] In one embodiment, the backpack portable tennis launcher further includes an adjustment assembly. The frame includes a base plate, and the adjustment assembly includes a left-right adjustment component. The left-right adjustment component includes a movable plate and a first crank guide wheel drive. The movable plate is disposed above the base plate, and the serve assembly is mounted on the movable plate. The first crank guide wheel drive is used to drive the movable plate to swing left and right relative to the base plate.

[0014] In one embodiment, the adjustment assembly further includes a height adjustment component, which includes a fixed frame and a second crank guide wheel drive component. The fixed frame is mounted on the movable plate and is hinged to the serving assembly. The second crank guide wheel drive component is used to drive the serving assembly to swing up and down relative to the fixed frame.

[0015] In one embodiment, the adjustment assembly further includes a reset assembly, which includes a horizontal reset switch and a vertical reset switch. A first limit rod is provided on the movable plate, the horizontal reset switch is mounted on the movable plate, and the horizontal reset switch is signal-connected to the first crank guide wheel drive component. A second limit rod is provided on the adjustment plate, the vertical reset switch is mounted on the movable plate, and the vertical reset switch is signal-connected to the second crank guide wheel drive component.

[0016] In the above solution, the portable tennis launcher includes a backpack and a launcher body. The backpack has a throwing hole and a serving hole. The launcher body is located inside the backpack and includes a frame, a ball-rotating disc assembly, and a serving assembly. The frame is connected to the backpack, the ball-rotating disc assembly is installed on top of the frame, and the serving assembly includes an inlet and an outlet. The serving assembly is installed inside the frame, and the ball-rotating disc assembly has a first ball-passing hole. The tennis ball can pass through the throwing hole, the first ball-passing hole, the inlet, the outlet, and the serving hole in sequence. Specifically, the backpack is made of sewn fabric, and the throwing hole and serving hole are made of fabric and covered with fabric. It is connected to the backpack by a zipper, so the throwing hole and serving hole can be opened or closed by the zipper. The fabric used to make the backpack can be two layers, with a frame set between the two layers, or a single layer of fabric can be directly attached to the frame, making the backpack more three-dimensional. The frame is then connected to the backpack, specifically via bolts or other mechanical locking mechanisms. This secures the frame. A ball-rotating disc assembly is installed at the top of the frame, allowing the ball-throwing hole to fully open. The serving assembly is then installed inside the frame, connected to the bottom of the frame with the inlet aligned with the first ball-draining hole and the outlet aligned with the serving hole. When in use, the user throws a tennis ball through the ball-throwing hole. The ball-rotating disc assembly rotates, causing the ball to enter the inlet through the first ball-draining hole. Once inside, the serving assembly applies a pre-set force of magnitude and direction, propelling the ball out of the outlet in the preset direction and then out of the serving hole, thus completing the serve. When the user needs to carry the ball machine, they can simply use the backpack straps to carry it on their back, making it convenient to take to any venue. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1A schematic diagram of the overall structure of an embodiment of the portable tennis launcher in a backpack provided by this utility model; Figure 2 A schematic diagram showing the open ball-throwing port of the portable tennis launcher for backpacks provided by this utility model; Figure 3 A schematic diagram showing the open firing port of the portable tennis launcher for backpacks provided by this utility model; Figure 4 A schematic diagram of the overall structure of an embodiment of the transmitter body provided by this utility model; Figure 5 A schematic diagram of the overall structure of an embodiment of the ball-rotating disk assembly provided by this utility model from one perspective; Figure 6 A schematic diagram of the overall structure of an embodiment of the ball-rotating disk assembly provided by this utility model from another perspective; Figure 7 A schematic diagram of the overall structure of an embodiment of the serving assembly provided by this utility model; Figure 8 A schematic diagram of the connection between the adjustment component and the reset component provided by this utility model from one perspective; Figure 9 A connection diagram from another perspective of an embodiment of the adjustment component and reset component provided by this utility model; Figure 10 A first-view connection diagram of an embodiment of the serving assembly, adjustment assembly, and reset assembly provided by this utility model; Figure 11 A second-view connection diagram of an embodiment of the serving assembly, adjustment assembly, and reset assembly provided by this utility model; Figure 12 This is a third-view connection diagram of an embodiment of the serving assembly, adjustment assembly, and reset assembly provided by this utility model.

[0019] Explanation of icon numbers: 100. Portable Tennis Launcher (Backpack); 1. Backpack; 11. Throwing Hole; 12. Serving Hole; 13. Shoulder Strap; 2. Launcher Body; 21. Frame; 211. Base Plate; 211a. First Slide; 211b. First Limiting Rod; 221c. First Rib; 221d. Second Rib; 22. Spinning Plate Assembly; 221. Circular Spinning Plate; 221b. Second Ball Drain Hole; 221e. Clearance Step; 222. Cover Plate; 223. First Ball Drain Hole; 23. Serving Assembly; 231. Slide; 231a. Second Slide; 232. Serving Component; 232a. Serving Wheel; 232b. Brushless Motor; 232c. Adjustment Plate; 232d. Second Limiting Rod; 233. Motor Bracket; 233a. Bracket Mounting Plate; 233b. Fixed connecting plate; 233c. Motor mounting plate; 233d. Elastic bending part; 233e. First connecting section; 233f. Second connecting section; 236. Electrical control board; 237. Inlet; 238. Outlet; 239. Side plate; 24. Rotating ball motor; 25. Fixing component; 26. Elastic component; 3. Adjustment assembly; 31. Movable plate; 32. Up and down adjustment component; 321. Second crank guide wheel drive component; 322. Vertical adjustment component; 322a. Second connecting rod; 322b. Second roller; 33. First crank guide wheel drive component; 34. Left and right adjustment component; 341. First connecting rod; 342. First roller; 35. Reset assembly; 351. Horizontal reset switch; 352. Vertical reset switch; 36. Stop plate.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] To achieve the above objectives, please refer to Figures 1 to 3 as well as Figure 7This utility model proposes a portable tennis launcher 100 for backpacks. The portable tennis launcher 100 includes a backpack 1 and a launcher body 2. The backpack has a throwing hole 11 and a serving hole 12. The launcher body 2 is disposed inside the backpack 1 and includes a frame 21, a ball-rotating disc assembly 22, and a serving assembly 23. The frame 21 is connected to the backpack 1. The ball-rotating disc assembly 22 is installed on the top of the frame 21. The serving assembly 23 includes an inlet 237 and an outlet 238 and is installed inside the frame 21. The ball-rotating disc assembly 22 is provided with... The first ball-passing hole 223 allows the tennis ball to pass sequentially through the ball-spitting hole 11, the first ball-passing hole 223, the inlet 237, the outlet 238, and the service hole 12. Specifically, a backpack 1 is made by sewing fabric together, and the ball-spitting hole 11 and the service hole 12 are provided on the backpack 1. Both the ball-spitting hole 11 and the service hole 12 are covered with fabric and connected to the backpack 1 by zippers. This allows the ball-spitting hole 11 and the service hole 12 to be opened or closed by the zippers. The fabric used to make the backpack 1 can be two layers, with a frame set between the two layers of fabric, or a single layer of fabric can be directly attached to the frame. On the frame, this makes the backpack 1 more three-dimensional. Then, the frame 21 is connected to the backpack 1, that is, the frame 21 is connected to the frame by bolts or other mechanical locking structures, thus completing the fixation of the frame 21. The ball-rotating disk assembly 22 is installed on the top of the frame 21, so that the ball-throwing hole 11 can open the entire ball-rotating disk assembly 22. Then, the ball-serving assembly 23 is installed inside the frame 21. The ball-serving assembly 23 is connected to the bottom of the frame 21, and the inlet 237 is aligned with the first ball-draining hole 223, and the outlet 238 is aligned with the ball-serving hole 12. This completes the installation. When in use, a tennis ball is inserted into the ball-throwing hole 11. The ball-rotating plate assembly 22 can rotate, allowing the tennis ball to enter the inlet 237 through the first ball-leaking hole 223. After the tennis ball enters the inlet 237, the ball-serving assembly 23 applies a pre-set size and direction of thrust to the tennis ball, causing the ball to be shot out from the outlet 238 in a preset direction, and then continue to be shot out from the ball-serving hole 12 to complete the serve. When the user needs to carry the ball-serving machine, they can simply carry it on their back using the shoulder strap 13 of the backpack 1, making it convenient for the user to carry the ball-serving machine to any venue.

[0025] Please see Figure 2 , Figure 4 as well as Figure 5In one embodiment, the transmitter body 2 further includes a ball-rotating motor 24, and the ball-rotating disk assembly 22 includes a circular rotating disk 221 and a baffle plate 222 provided with a first ball-leaking hole 223. The baffle plate 222 is disposed below the circular rotating disk 221. The ball-rotating motor 24 is mounted on the frame 21 and is used to drive the circular rotating disk 221 to rotate. The circular rotating disk 221 is provided with a plurality of second ball-leaking holes 221b arranged circumferentially around the center of the circular rotating disk 221. The plurality of second ball-leaking holes 221b can all communicate with the first ball-leaking hole 223. When using the ball-serving machine, the user inserts a tennis ball into the ball-throwing hole 11. The ball enters the circular rotating disk 221, and some of the balls enter the second ball-leaking hole 221b. The rotating motor 24 is then started, and its rotating shaft rotates, causing the circular rotating disk 221 to rotate. When one of the second ball-leaking holes 221b aligns with the first ball-leaking hole 223, the circular rotating disk 221 continues to rotate. The tennis ball in the second ball-leaking hole 221b falls through the first ball-leaking hole 223 and finally enters the serving assembly 23 for serving. The rotating motor 24 continues to rotate, thus sequentially passing the tennis balls in the second ball-leaking hole 221b through the first ball-leaking hole 223 into the serving assembly 23, preventing multiple tennis balls from entering the serving assembly 23 at once.

[0026] Please see Figure 2 , Figure 4 as well as Figure 5In one embodiment, the top of the circular rotating disk 221 is provided with a first rib 221c and a second rib 221d arranged perpendicularly to each other, and both the first rib 221c and the second rib 221d extend along the diameter of the circular rotating disk 221. Both the first rib 221c and the second rib 221d are used to abut against the ball to push the ball into the second ball-leaking hole 221b. When using the ball machine, users usually throw many tennis balls into the throwing hole 11 at the same time. Many tennis balls will enter the circular rotating disk 221, some of which will enter the second ball-leaking hole 221b, while the rest will pile up on top of the bottom tennis balls. Multiple tennis balls may get stuck due to their interaction forces and cannot enter the second ball-leaking hole 221b. Therefore, the circular rotating disk 221 is provided with a first rib 221c and a second rib 221d. During rotation, the first rib 221c and the second rib 221d will also rotate, and the first rib 221c and the second rib 221d will... d will push the tennis ball stuck above the second ball hole 221b away, and the tennis ball will enter the second ball hole 221b. This ensures that there is a tennis ball in the second ball hole 221b every time it is aligned with the first ball hole 223, thus improving the serving efficiency. In this embodiment, by setting the first rib 221c and the second rib 221d, it can prevent the occurrence of empty serves due to the tennis ball getting stuck. Moreover, compared with the prior art which only sets one rib, this embodiment sets two ribs, which can realize two ball pushes in the same time, greatly improving the ball push efficiency.

[0027] Please see Figure 4 and Figure 5 Furthermore, the height of the first rib 221c is lower than the height of the second wave cue 221d, and the length of the first rib 221c is greater than the length of the second rib 221d. The greater length of the first rib 221c than the second rib 221d means that they have a dimensional difference in the horizontal extension direction. This can be achieved by extending the end of the first rib 221c to the edge region of the circular rotating disk 221, thereby reducing stress concentration by expanding the support coverage. The greater height of the second rib 221d than the first rib 221c means that they have a dimensional difference in the vertical direction. This can be achieved by increasing the cross-sectional thickness of the second rib 221d or extending its top extension height, thereby enhancing structural stability by improving bending resistance.

[0028] Specifically, the two sets of intersecting ribs form a complementary support structure through asymmetric geometric parameters. The longer rib extends circumferentially along the circular rotating disk 221, covering a larger area affected by the tennis ball impact and dispersing local loads; the taller rib, by increasing its vertical cross-sectional dimensions, forms a bending-resistant support point when subjected to tennis ball impacts. The differentiated configuration of the two sets of ribs in both length and height dimensions results in a cumulative increase in structural strength at the intersection, preventing deformation and fracture caused by single-point overload. Through the above technical solution, this embodiment effectively solves the problem of easy deformation and fracture of the ribs of the circular rotating disk 221 under high-frequency impact. The differentiated geometric parameters enable the two sets of ribs to form a complementary support structure, dispersing the peak load when subjected to tennis ball impacts, reducing the stress concentration of individual ribs, thereby improving the overall structural durability and meeting the strength requirements of long-term, high-frequency operation scenarios.

[0029] Please see Figure 4 and Figure 5 Furthermore, the rotating disk assembly 22 also includes a stop plate 36, which is disposed on the frame 21 and located on the top of the circular rotating disk 221. The two ends of the first rib 221c form avoidance steps 221e for avoiding the stop plate 36.

[0030] The stop plate 36 is a limiting component located at the top edge of the circular rotating disk 221. It can be made of metal or engineering plastic. Its installation position is aligned with the axial direction of the first ball-leaking hole 223 to prevent tennis balls from entering the ball-leaking path if they are not aligned with the channel. The clearance step 221e is a stepped recessed structure located at the end of the first rib 221c. It can be formed by stamping or injection molding. The depth of the step matches the thickness of the stop plate 36, so that the rib remains in a non-contact state with the stop plate 36 when it rotates.

[0031] Specifically, as the circular rotating disk 221 rotates, the second ball-leaking hole 221b passes sequentially through the first ball-leaking hole 223. This covers the area except for the currently aligned second ball-leaking hole 221b, preventing upper-layer tennis balls from accidentally entering the misaligned channel. The clearance steps 221e at both ends of the first rib 221c form a dynamic gap with the stop plate 36 during rotation, preventing rigid collisions. When a second ball-leaking hole 221b rotates to align with the first ball-leaking hole 223, the tennis balls above that channel are blocked by the stop plate 36, allowing only a single tennis ball from the current second ball-leaking hole 221b to fall; the remaining tennis balls are confined to the corresponding area by the first rib 221c.

[0032] Through the above technical solution, this embodiment achieves physical avoidance between the first rib 221c and the stop plate 36 during the rotation of the circular rotating disk 221, avoiding component damage caused by mechanical collision, and ensuring that only a single tennis ball passes through the first ball leakage hole 223 each time, thus solving the launch failure problem caused by multiple balls falling at the same time.

[0033] Please see Figure 4 and Figure 5 In one embodiment, the circular rotating disk 221, the first rib 221c, and the second rib 221d are integrally formed parts.

[0034] Specifically, the circular rotating disk 221, the first rib 221c, and the second rib 221d are formed into a continuous material structure through an integral molding process, eliminating assembly gaps or welded joints in the connection area between the circular rotating disk 221, the first rib 221c, and the second rib 221d. During the rotation of the circular rotating disk 221, the impact force of the tennis ball borne by the first rib 221c and the second rib 221d is directly transmitted to the support part of the circular rotating disk 221 through the overall structure, avoiding stress concentration at the connection point in traditional split structures. Since there is no mechanical connection interface between the circular rotating disk 221 and the ribs, the risk of fracture due to material fatigue is eliminated, and the positioning and fastening steps required in the assembly process are eliminated. Through the above technical solution, this embodiment solves the problems of redundant parts and vulnerable connection structures caused by the split assembly of the ball-rotating disk assembly 22, realizes rapid assembly without additional connecting parts, and improves the deformation resistance of the first rib 221c and the second rib 221d under long-term high-frequency impact, reducing maintenance frequency and downtime risk.

[0035] Please see Figure 7 In one embodiment, the serving assembly 23 includes a slide component and a serving component 232. The slide component includes a slide 231 and side plates 239 formed on both sides of the slide 231. The slide 231, the two side plates 239, and the serving component 232 form an inlet 237, and an outlet 238 is provided on the serving component 232. The slide 231 is used to receive and transport tennis balls. The tennis ball enters the inlet 237 through the first ball-leaking hole 223 and then slides in the slide 231. When the tennis ball slides to the serving component 232, the serving component 232 applies pressure and rotation speed to the tennis ball, launching the tennis ball from the outlet 238. By providing side plates 239 on both sides of the slide 231, the tennis ball can be prevented from detaching from both sides of the slide 231, ensuring that the tennis ball can slide in the slide 231.

[0036] Please see Figure 7In one embodiment, the serving component 232 includes two serving wheels 232a and two brushless motors 232b. Both side plates 239 are provided with rotatable adjustment plates 232c. The two brushless motors 232b are mounted on one of the adjustment plates 232c. The motor shafts of the brushless motors 232b pass through the two adjustment plates 232c in sequence. The two serving wheels 232a are sleeved on the motor shafts of the two brushless motors 232b. The two serving wheels 232a surround to form an outlet 238. Specifically, a rotatable adjustment plate 232c is provided on the side plate 239, which can adjust the position of the ball-serving component 232 and thus the orientation of the outlet 238. When the tennis ball enters the inlet 237 from the first ball-leaking hole 223, the tennis ball will slide in the slide 231. When the tennis ball slides to the ball-serving wheel 232a, it will be squeezed by the two ball-serving wheels 232a. Since the motor shaft of the brushless motor 232b rotates, it will drive the ball-serving wheels 232a to rotate, so the two ball-serving wheels 232a will apply a torque to the tennis ball. Simultaneously, the tennis ball is squeezed and launched towards the outlet 238, thus achieving the serve. This eliminates the need for a human coach during training, greatly reducing the workload of coaches. Users can train at any time without waiting for a coach, saving waiting time. In this embodiment, the tennis ball is accelerated and launched by the squeezing and friction between the first serving wheel 232a and the slide 231. This requires only one drive motor and the first serving wheel 232a. Compared with the double serving wheel squeezing and launching method, the manufacturing and maintenance costs of this embodiment are lower.

[0037] Please see Figure 7In one embodiment, the ball-serving assembly 23 further includes a motor bracket 233, which includes a bracket mounting plate 233a, a connecting plate 233b, and a motor mounting plate 233c connected in sequence. The bracket mounting plate 233a is mounted on the adjusting plate 232c, the connecting plate 233b is provided with an elastic bending portion 233d, and the brushless motor 232b is mounted on the motor mounting plate 233c. When the brushless motor 232b is running, its motor shaft rotates. During this rotation, the cylinder of the brushless motor 232b vibrates. Since the motor bracket 233 is directly connected to the cylinder of the brushless motor 232b, this vibration is transmitted to the motor bracket 233 and then to the slide rail 231. This can cause the ball to deviate from the preset path during serve, affecting serve stability. By providing an elastic bending portion 233d on the fixed connecting plate 233b of the motor bracket 233, when the vibration is transmitted to the fixed connecting plate 233b through the motor mounting plate 233c, the elastic bending portion 233d on the fixed connecting plate 233b increases the local stiffness when the vibration is transmitted to the fixed connecting plate 233b. The elastic bending portion 233d can include unrestricted arcs and right angles, thereby changing the motor bracket's stability. The stiffness distribution of the bracket 233 adjusts its natural frequency, keeping it away from the vibration frequency of the brushless motor and preventing resonance. Simultaneously, the increased stiffness reduces the deformation of the motor bracket 233 under the vibration of the brushless motor 232b, making it more difficult for vibration energy to be transmitted through the motor bracket 233 to the adjustment plate 232c. This effectively transforms a rigid connection into a rigid connection, reducing vibration transmission efficiency and thus eliminating vibration. Furthermore, the elastic bending portion 233d on the fixed connecting plate 233b is equivalent to bending the original length of the fixed connecting plate 233b, shortening its length. Since the length direction of the fixed connecting plate 233b is the same as the extension direction of the motor shaft, this reduces the axial space occupied by the motor shaft, allowing for a more compact design of the backpack-style portable tennis launcher 100.

[0038] Please see Figure 7 Please see Figure 5 Furthermore, there are multiple elastic bending portions 233d, which are spaced apart along the length of the fixed connecting plate 233b. The spaced arrangement of multiple elastic bending portions 233d creates a segmented stiffness variation in the fixed connecting plate 233b, with slight differences in the natural frequency of each elastic bending portion 233d region. This disperses a concentrated single natural frequency into multiple frequency bands, thus more comprehensively avoiding the vibration frequency of the brushless motor 232b during operation and reducing the risk of resonance. Simultaneously, the multiple elastic bending portions 233d are equivalent to folding the fixed connecting plate 233b multiple times, which further shortens the length of the fixed connecting plate 233b, thereby further reducing the axial space occupied and enabling the ball-launching machine to be further miniaturized.

[0039] Please see Figure 7 Furthermore, the elastic bending portion 233d includes a first connecting segment 233e and a second connecting segment 233f that are interconnected, with an included angle between the first connecting segment 233e and the second connecting segment 233f. The angle of the included segment and the ratio of the first connecting segment 233e to the second connecting segment 233f can be flexibly adjusted. By changing the local mass distribution and stiffness characteristics, the natural frequency of the region of the elastic bending portion 233d can be precisely controlled, thus adapting to various types and sizes of brushless motors 232b.

[0040] Please see Figure 7 In one embodiment, the serving assembly 23 further includes a fixing member 25 and an elastic member 26. The fixing member 25 is disposed at the end of the output shaft of the brushless motor 232b, and the elastic member 26 is sleeved on the output shaft of the brushless motor 232b. One end of the elastic member 26 abuts against the fixing member 25, and the other end of the elastic member 26 abuts against the adjusting plate 232c. The brushless motor 232b is disposed on one of the adjusting plates 232c, and the fixing member 25 is disposed at the end of the motor shaft of the brushless motor 232b, that is, at the end of the motor shaft of the brushless motor 232b away from the brushless motor 232b. The elastic member 26 is disposed between the fixing member 25 and the corresponding adjusting plate 232c. The elastic member 26 can absorb the impact and vibration generated when the motor shaft of the brushless motor 232b rotates, so as to reduce the vibration when the motor shaft of the brushless motor 232b rotates, thereby improving the landing accuracy when launching the tennis ball. Meanwhile, the elastic element 26 can also provide axial preload, eliminate axial clearance between transmission components, reduce axial movement of the motor shaft of the brushless motor 232b, and ensure the axial position of the motor shaft of the brushless motor 232b is stable.

[0041] Furthermore, the elastic element 26 is a coil spring. The high strength of the coil spring ensures a more secure connection.

[0042] Furthermore, the fixing component includes a fixing rod and a baffle. The fixing rod is threaded to the motor shaft of the brushless motor, and the baffle is disposed on the fixing rod. An elastic element is disposed between the baffle and the adjusting plate of the cylinder body where the brushless motor is not installed. By rotating the fixing rod, the baffle moves, and the deformation of the elastic element is adjusted, thereby adjusting the distance between the two adjusting plates.

[0043] Furthermore, a limit block is provided at the end of the fixed rod away from the motor shaft of the brushless motor 232b; the baffle is slidably disposed on the fixed rod and can abut against the limit block. The limit block can restrict the position of the baffle and prevent the baffle from detaching from the fixed rod.

[0044] Please see Figure 7Furthermore, there are multiple serving wheels 232a and multiple brushless motors 232b. These multiple brushless motors 232b are spaced apart along the extension direction of the slide 231. The multiple serving wheels 232a rotate in the same direction. The number of serving wheels 232a and multiple brushless motors 232b are equal and correspond one-to-one. This structure allows the tennis ball to roll along the slide 231, achieving multiple compressions to accelerate the serve. Furthermore, by controlling the rotational speed of each brushless motor 232b, the final speed at which the tennis ball exits from the outlet 238 can be controlled.

[0045] Please see Figure 7 Furthermore, all brushless motors 232b are disposed on the same side of the same adjustment plate 232c. Distributing all brushless motors 232b on the same side of the adjustment plate 232c, compared to distributing them separately on opposite sides, reduces the space occupied, thereby decreasing the size of the serving component 232. This allows for a more compact design of the backpack-mounted tennis launcher 100, making it easier to carry.

[0046] Please see Figure 7 In one embodiment, the serving component 232 further includes an electronic control board 236, which is signal-connected to the brushless motor 232b. The electronic control board 236 is mounted on the cylinder of the brushless motor 232b. The electronic control board 236 is circular and coaxially arranged with the cylinder of the brushless motor 232b. The electronic control board 236 is used for signal connection with external control equipment. By directly mounting the electronic control board 236 on the motor cylinder and coaxially with it, the physical integration of the motor and control system is achieved. This avoids the traditional design where the control board is installed independently and requires long wires to connect to the brushless motor 232b, significantly reducing the overall size and space occupied by the serving component 232, making the internal layout of the backpack portable tennis launcher 100 simpler. The electronic control board 236 is connected to the brushless motor 232b at zero distance, and the power and control signal transmission paths are extremely short. It can even be connected board-to-board or directly soldered, greatly reducing the number of external cables, thereby significantly improving the reliability of electrical connections and reducing the risk of poor contact, signal interference, and wire breakage.

[0047] In one embodiment, the backpack portable tennis launcher further includes an adjustment assembly. The frame includes a base plate, and the adjustment assembly includes a left-right adjustment component. The left-right adjustment component includes a movable plate and a first crank guide wheel drive. The movable plate is disposed above the base plate, and the ball-serving assembly is mounted on the movable plate. The first crank guide wheel drive is used to drive the movable plate to swing left and right relative to the base plate.

[0048] In one embodiment, the adjustment assembly further includes a vertical adjustment component, which includes a fixed frame and a second crank guide wheel drive component. The fixed frame is mounted on the movable plate and is hinged to the serving assembly. The second crank guide wheel drive component is used to drive the serving assembly to swing vertically relative to the fixed frame.

[0049] In one embodiment, the adjustment assembly further includes a reset assembly, which includes a horizontal reset switch and a vertical reset switch. A first limit rod is provided on the movable plate, the horizontal reset switch is mounted on the movable plate, and the horizontal reset switch is signal-connected to the first crank guide wheel drive component. A second limit rod is provided on the adjustment plate, the vertical reset switch is mounted on the movable plate, and the vertical reset switch is signal-connected to the second crank guide wheel drive component.

[0050] Please see Figures 8 to 12 In one embodiment, the backpack portable tennis launcher 100 further includes an adjustment assembly 3. The frame 21 includes a base plate 211. The adjustment assembly 3 includes a movable plate 31, a vertical adjustment component 32, a first crank guide wheel drive component 33, and a horizontal adjustment component 34. One end of the vertical adjustment component 32 is connected to the side plate 239, and the other end of the vertical adjustment component 32 is mounted on the movable plate 31. The first crank guide wheel drive component 33 is mounted on the movable plate 31. The base plate 211 forms a first sliding groove 211a. The horizontal adjustment component 34 is slidably mounted on the first sliding groove 211a. The first crank guide wheel drive component 33 is used to drive the horizontal adjustment component 34 to slide along the first sliding groove 211a. When it is necessary to adjust the horizontal direction of the tennis serve, the first crank guide wheel drive 33 is activated. The first crank guide wheel drive 33 drives the left and right adjustment component 34 to slide in the first slide groove 211a. Since one end of the up and down adjustment component 32 is connected to the side plate 239 and the other end of the up and down adjustment component 32 is installed on the movable plate 31, the entire serving component 232 will be driven to move along the extension direction of the first slide groove 211a, thereby adjusting the position of the outlet 238 in the horizontal direction. This allows for serve training in different positions.

[0051] Please see Figures 8 to 12Furthermore, one end of the up-down adjustment component 32 is connected to the slide rail 231, and the other end of the up-down adjustment component 32 is installed on the movable plate 31. The left-right adjustment component 34 includes a first connecting rod 341 and a first roller 342 rotatably disposed on the first connecting rod 341. The first crank guide wheel drive component 33 is installed on the movable plate 31. The first crank guide wheel drive component 33 is an eccentric motor. The first connecting rod 341 is rotatably disposed on the eccentric shaft of the eccentric motor. The first roller 342 is rolledly installed on the first slide groove 211a. When it is necessary to adjust the horizontal direction of the tennis serve, the first crank guide wheel drive 33 is activated. The rotating shaft of the first crank guide wheel drive 33 rotates, which drives the eccentric shaft to rotate. The first connecting rod 341 also rotates, and the first roller 342 is rolled in the first slide groove 211a. The first roller 342 moves in the first slide groove 211a. Since one end of the up-down adjustment component 32 is connected to the slide 231 and the other end of the up-down adjustment component 32 is installed on the movable plate 31, the cylinder of the first crank guide wheel drive 33 is installed on the movable plate 31, and the adjustment plate 232c is connected to the slide 231, the entire serving component 232 is driven to move along the extension direction of the first slide groove 211a, thereby adjusting the position of the outlet 238 in the horizontal direction.

[0052] Please see Figures 8 to 12In one embodiment, the vertical adjustment component 32 includes a second crank guide wheel drive component 321 and a vertical adjustment component 322. A second sliding groove 322b is formed on the side plate 239. The vertical adjustment component 322 is slidably mounted in the second sliding groove 322b. The second crank guide wheel drive component 321 is mounted on the movable plate 31 and is used to drive the vertical adjustment component 322 to slide along the second sliding groove 322b. The vertical adjustment component 322 includes a second connecting rod 322a and a second roller 322b rotatably disposed on the second connecting rod 322a. A second mounting hole is provided on the second connecting rod 322a. The second crank guide wheel drive component 321 is mounted on the movable plate 31. The second crank guide wheel drive component 321 is an eccentric motor. The second connecting rod 322a is rotatably connected to the eccentric shaft of the eccentric motor. The second roller 322b is rotatably mounted in the second sliding groove 231a. When it is necessary to adjust the vertical direction of the tennis serve and the horizontal direction perpendicular to the first groove 211a, the second crank guide wheel drive 321 is activated. The rotation shaft of the second crank guide wheel drive 321 rotates, and the eccentric shaft also rotates, which drives the second connecting rod 322a to rotate. The second roller 322b of the second connecting rod 322a is rolled in the first groove 211a, so the second roller 322b moves in the second groove 231a. This drives the entire serving component 232 to move along the extension direction of the second groove 231a, thereby adjusting the position of the outlet 238 in the vertical direction and the horizontal direction perpendicular to the first groove 211a, that is, the position of the frame 21 in the vertical direction and the width direction of the frame 21. This can further increase the diversity of serving positions and further improve the training effect.

[0053] Please see Figures 8 to 12In one embodiment, the adjustment assembly 3 further includes a reset assembly 35, which includes a horizontal reset switch 351 and a vertical reset switch 352. A first limit rod 211b is provided on the base plate 211. The horizontal reset switch 351 is mounted on the movable plate 31 and is signal-connected to the first crank guide wheel drive component 33. A second limit rod 232d is provided on the adjustment plate 232c. The vertical reset switch 352 is mounted on the movable plate 31 and is signal-connected to the second crank guide wheel drive component 321. When the first crank guide wheel drive 33 drives the serving component 232 to move along the first slide groove 211a, the movable plate 31 will also move accordingly. When the horizontal reset switch 351 on the movable plate 31 contacts the first limit rod 211b, it indicates that the horizontal position of the serving component 232 has exceeded the preset position. At this time, after the horizontal reset switch 351 contacts the first limit rod 211b, it will send a signal to the first crank guide wheel drive 33, driving the first crank guide wheel drive 33 to rotate in the opposite direction and return to the original position. Similarly, when the second crank guide wheel drive 321 drives the serving component 232 to move along the second slide groove 231a, when the horizontal reset switch 351 on the movable plate 31 contacts the first limit rod 211b, it indicates that the horizontal position of the serving component 232 has exceeded the preset position. When the vertical reset switch 352 contacts the second limit rod 232d on the adjustment plate 232c, it indicates that the vertical position of the serving component 232 has exceeded the preset position. At this time, after the vertical reset switch 352 contacts the second limit rod 232d, it will send a signal to the second crank guide wheel drive 321, driving the second crank guide wheel drive 321 to rotate in the opposite direction and return to the original position. This embodiment realizes the position limit of the serving component 232, preventing the serving component 232 from colliding with the frame 21, preventing damage to the serving component 232, and preventing the serving component 232 from failing to shoot the tennis ball out of the serving hole 12.

[0054] Furthermore, the adjustment component and the brushless motor 232b are both located on the same side of the adjustment plate 232c. Compared to the adjustment component and the cylinder of the brushless motor 232b and the cylinder of the second brushless motor 235 being located on different sides of the adjustment plate 232c, this also reduces the space occupied by the adjustment component. The adjustment component occupies the remaining space after the cylinders of the brushless motor 232b and the second brushless motor 235 are occupied, further miniaturizing the backpack portable tennis launcher 100 and further improving its portability.

[0055] The above are merely exemplary embodiments of this utility model and do not limit the scope of protection of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A backpack-style portable tennis launcher for launching tennis balls, characterized in that, include: A backpack, which has a throwing hole and a launching hole; The launcher body is housed inside a backpack. The launcher body includes a frame, a ball-spinning disc assembly, and a ball-launching assembly. The frame is connected to the backpack. The ball-spinning disc assembly is installed on the top of the frame. The ball-serving assembly includes an inlet and an outlet. The ball-serving assembly is installed inside the frame. The ball-spinning disc assembly is provided with a first ball-draining hole. The tennis ball can pass through the ball-throwing hole, the first ball-draining hole, the inlet, the outlet, and the ball-serving hole in sequence.

2. The backpack-style portable tennis launcher as described in claim 1, characterized in that, The transmitter body also includes a ball-rotating motor. The ball-rotating disk assembly includes a circular rotating disk and a baffle plate with the first ball-leaking hole. The baffle plate is located below the circular rotating disk. The ball-rotating motor is mounted on the frame and is used to drive the circular rotating disk to rotate. The circular rotating disk is provided with a plurality of second ball-leaking holes arranged circumferentially around the center of the circular rotating disk. All of the plurality of second ball-leaking holes can communicate with the first ball-leaking hole.

3. The backpack-style portable tennis launcher as described in claim 2, characterized in that, The top of the circular rotating disk is provided with a first rib and a second rib that are perpendicular to each other, and both the first rib and the second rib extend along the diameter direction of the circular rotating disk. Both the first rib and the second rib are used to abut against the ball to push the ball into the second ball leakage hole.

4. The backpack-style portable tennis launcher as described in claim 1, characterized in that, The serving assembly includes a slide component and a serving component. The slide component includes a slide and side plates formed on both sides of the slide. The slide, the two side plates, and the serving component surround to form the entrance, and the exit is provided at the serving component.

5. The backpack-style portable tennis launcher as described in claim 4, characterized in that, The serving component includes two serving wheels and two brushless motors. Each of the two side plates is provided with a rotatable adjustment plate. Each of the two brushless motors is mounted on one of the adjustment plates. The motor shafts of the brushless motors pass through the two adjustment plates in sequence. The two serving wheels are sleeved on the motor shafts of the two brushless motors. The two serving wheels surround to form the outlet.

6. The backpack-style portable tennis launcher as described in claim 5, characterized in that, The serving component also includes a motor bracket, which comprises a bracket mounting plate, a connecting plate, and a motor mounting plate connected in sequence. The bracket mounting plate is mounted on the adjusting plate, and the connecting plate is provided with an elastic bending portion. The brushless motor is mounted on the motor mounting plate.

7. The backpack-style portable tennis launcher as described in claim 5, characterized in that, The serving assembly also includes a fixing member and an elastic member. The fixing member is disposed at the end of the output shaft of the brushless motor, and the elastic member is sleeved on the output shaft of the brushless motor. One end of the elastic member abuts against the fixing member, and the other end of the elastic member abuts against the adjusting plate.

8. The backpack-style portable tennis launcher as described in claim 7, characterized in that, The backpack-style portable tennis launcher also includes an adjustment assembly. The frame includes a base plate, and the adjustment assembly includes a left-right adjustment component. The left-right adjustment component includes a movable plate and a first crank guide wheel drive. The movable plate is disposed above the base plate, and the serve assembly is mounted on the movable plate. The first crank guide wheel drive is used to drive the movable plate to swing left and right relative to the base plate.

9. The backpack-style portable tennis launcher as described in claim 8, characterized in that, The adjustment assembly further includes an up-and-down adjustment component, which includes a fixed frame and a second crank guide wheel drive component. The fixed frame is mounted on the movable plate and is hinged to the serving assembly. The second crank guide wheel drive component is used to drive the serving assembly to swing up and down relative to the fixed frame.

10. The backpack-mounted tennis launcher as described in claim 9, characterized in that, The adjustment assembly further includes a reset assembly, which includes a horizontal reset switch and a vertical reset switch. A first limit rod is provided on the movable plate. The horizontal reset switch is mounted on the movable plate and is signal-connected to the first crank guide wheel drive component. A second limit rod is provided on the adjustment plate. The vertical reset switch is mounted on the movable plate and is signal-connected to the second crank guide wheel drive component.

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