Motor support and tennis ball server

Abstract

The utility model discloses a motor support and tennis ball serving machine relates to motor support technical field, wherein, the motor support is used for fixing the motor of serving machine on the fixed plate, and the motor support includes support mounting plate, connecting plate and motor mounting plate, and the support mounting plate is used for installing in the fixed plate, and the elastic bending part is arranged on the connecting plate, and one end of connecting plate is connected with the support mounting plate, and the other end of connecting plate is connected with the motor mounting plate, and the motor mounting plate is used for connecting with the motor. In the utility model, because the elastic bending part is arranged on the connecting plate, so it increases local rigidity, and after the rigidity increases, the deformation of motor support under the vibration of motor will reduce, and vibration energy is more difficult to pass through motor support and is delivered to the fixed plate, and it is equivalent to hard connection becomes rigid connection, reduces vibration transmission efficiency, thereby eliminates the vibration, shortens the length of connecting plate simultaneously, and the occupation of motor shaft axial space is reduced, thereby make the serving machine can be more miniaturization.

Description

Technical Field

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

[0002] A tennis ball machine is a widely used device in tennis training. Its main function is to simulate the real hitting motion through mechanical means, launching the ball in a regular pattern to help athletes improve their reaction speed, hitting accuracy, and tactical coordination. The motor, as the core driving component of the ball machine, directly affects the accuracy and speed control of the serve, as well as the overall reliability of the equipment, due to its installation stability.

[0003] Currently, most tennis ball machines use one or more motors to drive the ball wheel to achieve the hitting action. The motor is usually fixed to the main body of the ball machine by a bracket structure. However, existing motor brackets still have some problems in practical applications. Some bracket structures are relatively simple in design and lack sufficient rigidity and shock absorption measures, which causes the motor to vibrate significantly when running at high speeds, affecting the stability of the serve and even causing parts to loosen or be damaged.

[0004] Therefore, it is necessary to provide a new motor bracket and tennis ball serving machine to solve the above-mentioned technical problems. Utility Model Content

[0005] The main purpose of this utility model is to propose a motor bracket and a tennis ball serving machine, aiming to improve the technical problem in the prior art that the motor bracket is prone to large vibrations during motor operation, thus affecting the stability of the ball serving machine.

[0006] To achieve the above objectives, according to one aspect of the present invention, a motor bracket is provided, which is used to fix the motor of a ball-launching machine to a fixing plate. The motor bracket includes: A bracket mounting plate, which is used to mount the fixing plate; A connecting plate, wherein an elastic bending portion is provided on the connecting plate, and one end of the connecting plate is connected to the bracket mounting plate; A motor mounting plate, the other end of which is connected to the connecting plate, the motor mounting plate being used to connect to the motor.

[0007] In one embodiment, there are multiple elastic bending portions, which are spaced apart along the length of the connecting plate.

[0008] In one embodiment, the elastic bending portion includes a first connecting segment and a second connecting segment connected to each other, with an included angle between the first connecting segment and the second connecting segment.

[0009] In one embodiment, the included angle α between the first connecting segment and the second connecting segment is in the range of 30°≤α≤120°.

[0010] In one embodiment, the included angle α is in the range of 70°≤α≤100°.

[0011] In one embodiment, the motor mounting plate has a first side facing the connecting plate, and the bracket mounting plate has a second side facing the connecting plate, the length of the first side being... The length of the second side is The width of the connecting plate is d; where 1 / 5 × ≤d≤1 / 3× 1 / 5× ≤d≤1 / 3× .

[0012] In one embodiment, the motor bracket further includes a first fastener, and a first mounting hole is formed on the bracket mounting plate. The first fastener passes through the first mounting hole for mounting on the fixing plate. The first mounting hole is an oblong hole that extends in the vertical direction.

[0013] In one embodiment, a heat dissipation opening is formed on the motor mounting plate, the heat dissipation opening being used to connect the motor to the outside world.

[0014] In one embodiment, the bracket mounting plate, the connecting plate, and the motor mounting plate are integrally formed.

[0015] According to another aspect of the present invention, the present invention also provides a tennis ball serving machine, including a fixed plate, a frame, a motor and the motor bracket described above, wherein the fixed plate is connected to the frame, the bracket mounting plate is mounted on the fixed plate, and the motor mounting plate is connected to the motor.

[0016] In the above solution, the motor bracket is used to fix the motor of the ball-serving machine to the fixed plate. The motor bracket includes a bracket mounting plate, a connecting plate, and a motor mounting plate. The bracket mounting plate is used to install itself on the fixed plate. The connecting plate is provided with an elastic bending part. One end of the connecting plate is connected to the bracket mounting plate, and the other end of the connecting plate is connected to the motor mounting plate. The motor mounting plate is used to connect to the motor. Specifically, one end of the connecting plate is connected to the bracket mounting plate, then the other end of the connecting plate is connected to the motor mounting plate, then the bracket mounting plate is installed on the fixed plate, and finally the ball-serving wheel is fitted onto the motor shaft of the motor, and the motor is installed on the motor mounting plate, thus completing the motor installation. When the motor is running, the motor shaft of the motor rotates, and the motor will vibrate during the rotation. Since the motor bracket is directly connected to the motor, the vibration will be transmitted to the motor bracket and then to the fixed plate. The fixed plate is connected to the overall frame of the ball-serving machine, which will cause the ball to deviate from the preset path when the ball is served, affecting the stability of the serve. In this utility model, by providing an elastic bending part on the connecting plate of the motor bracket, the vibration can be prevented from being transmitted to the fixed plate. When the vibration energy is transmitted from the motor mounting plate to the connecting plate, the elastic bending section on the connecting plate increases the local stiffness, thereby changing the stiffness distribution of the motor bracket and adjusting its natural frequency to be far away from the motor's vibration frequency, thus avoiding resonance. At the same time, with the increased stiffness, the deformation of the motor bracket under the motor's vibration is reduced, making it more difficult for vibration energy to be transmitted from the motor bracket to the frame. This is equivalent to changing a rigid connection to a rigid connection, reducing vibration transmission efficiency. Furthermore, the elastic bending section on the connecting plate is equivalent to bending the original length of the connecting plate, thus shortening its length. Since the length direction of the connecting plate is the same as the extension direction of the motor shaft, this reduces the axial space occupied by the motor shaft, allowing the ball-launching machine to be more compact. 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 1 A schematic diagram of the overall structure of an embodiment of the motor bracket provided by this utility model; Figure 2 Another perspective view of the overall structure of an embodiment of the motor bracket provided by this utility model; Figure 3 A schematic diagram showing the connection between the motor bracket, the fixing plate, and the motor provided by this utility model.

[0019] Explanation of icon numbers: 100. Motor bracket; 1. Bracket mounting plate; 12. First mounting hole; 2. Connecting plate; 21. Elastic bending part; 211. First connecting section; 212. Second connecting section; 3. Motor mounting plate; 32. Second mounting hole; 33. Heat dissipation opening slot; 101. Fixing plate; 102. Motor.

[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 Figure 1This utility model proposes a motor bracket 100, which is used to fix the motor 102 of the ball-serving machine on the fixing plate 101. The motor bracket 100 includes a bracket mounting plate 1, a connecting plate 2 and a motor mounting plate 3. The bracket mounting plate 1 is used to be mounted on the fixing plate 101. The connecting plate 2 is provided with an elastic bending part 21. One end of the connecting plate 2 is connected to the bracket mounting plate 1, and the other end of the connecting plate 2 is connected to the motor mounting plate 3. The motor mounting plate 3 is used to connect to the motor 102. Specifically, one end of the connecting plate 2 is connected to the bracket mounting plate 1, and the other end of the connecting plate 2 is connected to the motor mounting plate 3. The bracket mounting plate 1 is then installed on the fixed plate 101 of the ball-serving machine. Finally, a ball-serving wheel is fitted onto the motor shaft of the motor 102, and the motor 102 is installed on the motor mounting plate 3, thus completing the installation of the motor 102. When the motor 102 runs, the motor shaft of the motor 102 rotates, and the motor 102 vibrates during this rotation. Since the motor bracket 100 is directly connected to the motor 102, the vibration is transmitted to the motor bracket 100 and then to the fixed plate 101. The fixed plate 101 is connected to the frame of the ball-serving machine, which causes the ball to deviate from the preset path when the ball is served, affecting the stability of the serve. In this embodiment, an elastic bending part 21 is provided on the connecting plate 2 of the motor bracket 100, so that when the vibration passes through the motor mounting plate... When the vibration energy is transmitted to the connecting plate 2, the connecting plate 2 has an elastic bending part 21, the structure of which includes unlimited circular arcs and right angles, etc. This increases the local stiffness, thereby changing the stiffness distribution of the motor bracket 100 and adjusting its natural frequency, making it far away from the vibration frequency of the motor 102, thus avoiding resonance. At the same time, with the increase in stiffness, the deformation of the motor bracket 100 under the vibration of the motor 102 will be reduced, and the vibration energy will be more difficult to be transmitted to the fixed plate 101 through the motor bracket 100. This is equivalent to changing the hard connection to a rigid connection, reducing the vibration transmission efficiency, thereby eliminating vibration. Furthermore, setting the elastic bending part 21 on the connecting plate 2 is equivalent to bending the original length of the connecting plate 2, thus shortening the length of the connecting plate 2. Since the length direction of the connecting plate 2 is the same as the extension direction of the motor shaft, this reduces the axial space occupied by the motor shaft, thus making the ball launching machine more compact.

[0025] In one embodiment, there are multiple elastic bending portions 21, which are spaced apart along the length of the connecting plate 2. The spaced elastic bending portions 21 cause the connecting plate 2 to form a segmented stiffness change, and the natural frequency of each elastic bending portion 21 region has a slight difference. This disperses a concentrated single natural frequency into multiple frequency bands, thereby more comprehensively avoiding the vibration frequency of the motor 102 during operation and reducing the risk of resonance. At the same time, multiple elastic bending portions 21 are equivalent to folding the connecting plate 2 multiple times, which is equivalent to further shortening the length of the connecting plate 2, thereby further reducing the axial space occupied and further enabling the ball launching machine to be more miniaturized.

[0026] Please see Figure 1 In one embodiment, the elastic bending portion 21 includes a first connecting segment 211 and a second connecting segment 212 connected to each other, with an included angle between the first connecting segment 211 and the second connecting segment 212. The angle of the included segment and the ratio of the first connecting segment 211 to the second connecting segment 212 can be flexibly adjusted. By changing the local mass distribution and stiffness characteristics, the natural frequency of the region of the elastic bending portion 21 can be precisely controlled, thus adapting to motors of various types and sizes.

[0027] In one embodiment, the included angle α between the first connecting segment 211 and the second connecting segment 212 is in the range of 30°≤α≤120°. The included angle between the first connecting segment 211 and the second connecting segment 212 can be in the range of 0° to 180°, but not including 0° or 180°. The best shock absorption effect is achieved when the included angle α between the first connecting segment 211 and the second connecting segment 212 is in the range of 30° to 120°. When α is an acute angle in the range of 30° to 60°, a V-shaped inclined support is formed, reducing axial impact vibration through force decomposition; when α is an obtuse angle in the range of 90° to 120°, it approaches a U-shaped structure, which can enhance lateral shear stiffness and suppress torsional vibration of the connecting plate.

[0028] In one embodiment, the included angle α ranges from 70° to 100°. When α is between 70° and 90°, the pressure angle is smaller, which can reduce harmful force components and improve the transmission efficiency of vibration loads. When α is between 90° and 100°, an L-shaped rigid structure is formed, with the two connecting sections respectively strengthening the bending stiffness and shear stiffness. An included angle of approximately 90° causes the vibration wave to undergo two perpendicular reflections, increasing the wave propagation distance and interface friction dissipation, thus greatly increasing the vibration attenuation effect.

[0029] Furthermore, the included angle between the second connecting segment 212 and the connecting plate 2 ranges from 0° to 90°, but does not include 0° or 90°; the included angle between the first connecting segment 212 and the bracket mounting plate 1 ranges from 0° to 90°, but does not include 0° or 90°. The included angle between the second connecting segment 212 and the connecting plate 2, as well as the included angle between the first connecting segment 212 and the bracket mounting plate 1, changes with the change of the included angle between the first connecting segment 211 and the second connecting segment 212.

[0030] Please see Figure 1 In one embodiment, the motor mounting plate has a first side facing the connecting plate, and the bracket mounting plate has a second side facing the connecting plate. The length of the first side is... The length of the second side is The width of the connecting plate is d; where 1 / 5 × ≤d≤1 / 3× 1 / 5× ≤d≤1 / 3× The widths of the motor mounting plate 3, connecting plate 2, and bracket mounting plate 1 change from wide to narrow and then wide again, forming a stepped stiffness distribution with rigid supports at both ends and a flexible buffer in the middle. The motor mounting plate 3 needs to bear the weight of the motor and the vibration source, and its wider design ensures the rigidity of the foundation and prevents the motor from shaking. The width of the connecting plate 2 is reduced to 1 / 5 to 1 / 3, and controllable flexibility is introduced through cross-sectional shrinkage to convert high-frequency vibration into local elastic deformation. The bracket mounting plate 1 returns to its wide size, and the remaining low-frequency vibration is dispersed through rigid anchoring to avoid resonance.

[0031] Furthermore, the sum of the lengths of the second connecting segment 212 and the first connecting segment 211 is greater than half the length of the connecting plate 2, and the length of the first connecting segment 211 is greater than the width of the bracket mounting plate 1. If the total length of the connecting plate is 100mm, the sum of the lengths of the two connecting segments is greater than 50mm, forming a zigzag channel with an included angle of 70°~100°. This causes high-frequency vibrations to undergo two bending reflections and material internal losses during propagation, resulting in a higher energy attenuation rate compared to a single segment. The length of the first connecting segment 211 is greater than the width of the bracket mounting plate 1, allowing it to be optimized in terms of slenderness ratio to be between 1 / 5 and 1 / 3 when bearing lateral loads. Combined with the pre-deformation of the elastic bending part 21, this effectively prevents vibration.

[0032] Please see Figures 1 to 3In one embodiment, the motor bracket 100 further includes a first fastener and a second fastener. A first mounting hole 12 is formed on the bracket mounting plate 1, and a plurality of second mounting holes 32 are formed on the motor mounting plate 3. The first fastener passes through the first mounting hole 12 and is mounted on the fixing plate 101. The second fastener passes through the second mounting holes 32 and is mounted on the motor 102. The first fastener passes through the first mounting hole 12 of the bracket mounting plate 1 and locks the first fastener onto the fixing plate 101. The second fastener passes through the second mounting holes 32 of the motor mounting plate 3 and locks the second fastener onto the motor 102. This locking structure enables rapid disassembly and installation of the motor bracket 100, greatly improving the efficiency of installation and disassembly.

[0033] Please see Figures 1 to 3 In one embodiment, there are multiple first fasteners and multiple first mounting holes 12. The multiple first mounting holes 12 are spaced apart along the length direction of the bracket mounting plate 1. The number of multiple first fasteners and multiple first mounting holes 12 are equal and correspond one-to-one. There are multiple second fasteners and multiple second mounting holes 32. The multiple second mounting holes 32 are arranged circumferentially along the center of the motor mounting plate 3. The number of multiple second fasteners and multiple second mounting holes 32 are equal and correspond one-to-one. By setting multiple first mounting holes 12 spaced apart along the length of the bracket mounting plate 1, and locking the first mounting holes 12 to the fixing holes of the fixing plate 101 one by one with the first fasteners, the connection between the fixing plate 101 and the bracket mounting plate 1 can be made more secure, and the position of the bracket mounting plate 1 in the horizontal direction can be adjusted. By setting multiple second mounting holes 32 arranged circumferentially along the center of the motor mounting plate 3, and locking the second mounting holes 32 to the motor 102 one by one with the second fasteners, the connection between the motor 102 and the motor mounting plate 3 can be made more secure.

[0034] Please see Figures 1 to 3 In one embodiment, the first mounting hole 12 is an oblong hole that extends vertically. The oblong shape of the first mounting hole 12 allows the motor bracket 100 to move or adjust its position within the length of the oblong hole, thereby adjusting the position of the motor bracket 100 in the vertical direction of the fixing plate 101. Furthermore, the oblong shape allows for machining error margins, preventing installation difficulties due to dimensional deviations.

[0035] Please see Figures 1 to 3In one embodiment, a heat dissipation opening 33 is formed on the motor mounting plate 3, which is used to connect the motor 102 to the outside. When the motor mounting plate 3 is connected to the motor 102, the motor mounting plate 3 completely blocks the motor 102, which prevents the heat generated by the motor 102 during operation from being dissipated, making the motor 102 prone to high-temperature damage. In this embodiment, the heat dissipation opening 33 is formed on the motor mounting plate 3 to connect the motor 102 to the outside, allowing all the heat to be dissipated and preventing the motor 102 from being damaged by high temperature.

[0036] In one embodiment, the bracket mounting plate 1, the connecting plate 2, and the motor mounting plate 3 are integrally formed. This integral forming avoids weak points in the connections caused by splicing or assembly, thus improving the overall strength of the motor bracket 100.

[0037] According to another aspect of this utility model, a tennis ball serving machine is also provided, including a fixed plate 101, a frame, a motor 102, and the aforementioned motor bracket 100. The fixed plate 101 is connected to the frame, a bracket mounting plate 1 is mounted on the fixed plate 101, and a motor mounting plate 3 is connected to the motor 102. One end of a connecting plate 2 is connected to the bracket mounting plate 1, and the other end of the connecting plate 2 is connected to the motor mounting plate 3. The fixed plate 101 is fixed to the frame, and the bracket mounting plate 1 is mounted on the fixed plate 101. Finally, a serving wheel is fitted onto the motor shaft of the motor 102, and the motor 102 is mounted on the motor mounting plate 3. There are two motor brackets 100 and two motors 102, so the two motor brackets 100 are spaced apart, and the motors 102 are also spaced apart. When a tennis ball is thrown into the tennis ball serving machine, the tennis ball slides on the slide rail on the frame until it reaches the serving wheel. When the ball is at the ball wheel, it is squeezed by the two serving wheels. Since the motor shafts of the two motors 102 rotate in opposite directions, the serving wheels apply torque to the ball, thus launching the ball out of the tennis ball serving machine. 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. Since the tennis ball serving machine includes all the embodiments of the motor bracket 100 described above, it has at least all the beneficial effects brought by all the above embodiments, which will not be elaborated here.

[0038] 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 motor bracket, the motor bracket being used to fix the motor of a ball-serving machine to a fixing plate, characterized in that, include: A bracket mounting plate, which is used to mount the fixing plate; A connecting plate, wherein an elastic bending portion is provided on the connecting plate, and one end of the connecting plate is connected to the bracket mounting plate; A motor mounting plate, the other end of which is connected to the connecting plate, the motor mounting plate being used to connect to the motor.

2. The motor bracket as described in claim 1, characterized in that, The number of elastic bending portions is multiple, and the multiple elastic bending portions are spaced apart along the length direction of the connecting plate.

3. The motor bracket as described in any one of claims 1 or 2, characterized in that, The elastic bending portion includes a first connecting segment and a second connecting segment that are connected to each other, and an included angle is formed between the first connecting segment and the second connecting segment.

4. The motor bracket as described in claim 3, characterized in that, The included angle α between the first connecting segment and the second connecting segment is in the range of 30°≤α≤120°.

5. The motor bracket as described in claim 4, characterized in that, The included angle α is in the range of 70°≤α≤100°.

6. The motor bracket as described in claim 3, characterized in that, The motor mounting plate has a first side facing the connecting plate, and the bracket mounting plate has a second side facing the connecting plate. The length of the first side is L1, the length of the second side is L2, and the width of the connecting plate is d; wherein, 1 / 5×L1≤d≤1 / 3×L1, 1 / 5×L2≤d≤1 / 3×L2.

7. The motor bracket as described in claim 5, characterized in that, The motor bracket also includes a first fastener. A first mounting hole is formed on the bracket mounting plate. The first fastener passes through the first mounting hole for mounting on the fixing plate. The first mounting hole is an oblong hole that extends vertically.

8. The motor bracket as described in claim 6, characterized in that, The motor mounting plate has a heat dissipation opening slot, which is used to connect the motor to the outside world.

9. The motor bracket as described in claim 1, characterized in that, The bracket mounting plate, the connecting plate, and the motor mounting plate are integrally formed.

10. A tennis ball serving machine, characterized in that, The device includes a fixing plate, a frame, a motor, and a motor bracket as described in any one of claims 1 to 9, wherein the fixing plate is connected to the frame, the bracket mounting plate is mounted on the fixing plate, and the motor mounting plate is connected to the motor.

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