Pneumatic tennis machine

Abstract

The utility model relates to the field of tennis ball launching equipment, in particular to a pneumatic tennis machine. The pneumatic tennis machine comprises a launching box, a push-and-pull assembly, a pneumatic assembly, a launching assembly and an auxiliary part, the push-and-pull assembly pushes the pneumatic box to be close to the launching assembly, after a closed space is formed, a ventilation pipe inflates air into the pneumatic box, air pressure acts on a ball, and the ball is rapidly pushed out of a launching cylinder. The whole process does not need a complex mechanical transmission mechanism, the structure is simple, maintenance is easy, meanwhile, the advantages of the pneumatic technology are utilized, noise and energy consumption of equipment are remarkably reduced, and the use experience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of respirator blower, in particular to a pneumatic tennis machine. BACKGROUND

[0002] At present, there are various types of tennis training equipment on the market, including traditional ball launching machines and manual ball throwing devices. With the development of technology, electric ball launching machines have gradually become the mainstream, which realize continuous launching of tennis balls through motor drive. However, these devices still have certain limitations in power source, launching accuracy and portability. In recent years, pneumatic technology has begun to be applied in sports training equipment due to its high efficiency, low noise and environmental protection characteristics, but it has not been widely used in the field of tennis training.

[0003] The existing tennis ball launching machines mainly include electric ball launching machines and manual ball throwing devices. The electric ball launching machines usually adopt motor drive roller or spring mechanism to launch the tennis balls, which has the advantages of continuous launching and adjustable speed, but has the disadvantages of large size, high noise and high maintenance cost. The manual ball throwing devices rely on manual operation, which is portable and low in cost, but cannot realize continuous launching and accurate control. In addition, some high-end devices use compressed air as power source, but the structure is complex and the price is expensive, so the popularization rate is low.

[0004] Therefore, there is an urgent need for a pneumatic tennis machine with simple structure, low cost and stable performance to solve the above problems. Content of the utility model

[0005] The purpose of the present application is to overcome the above technical problems, and a pneumatic tennis machine is provided, which adopts the following scheme:

[0006] The pneumatic tennis machine comprises a launching box, a frame arranged inside the launching box, and a through hole arranged on the side of the launching box; a push-pull assembly arranged at the inner end of the launching box; a pneumatic assembly arranged at the inner end of the launching box and opposite to the push-pull assembly, the pneumatic assembly comprising a pneumatic box and a spring piece, one end of the pneumatic box being connected to the push-pull assembly, the other end of the pneumatic box being provided with a first flange ring to pass through the inner space of the pneumatic box, an air pipe being connected to the side of the pneumatic box to introduce gas into the inner space of the pneumatic box, one end of the spring piece being fixed in the pneumatic box through the first flange ring, the other end of the spring piece being exposed to the first flange ring to abut against a ball; a launching assembly arranged at the inner end of the launching box and at the end of the spring piece away from the push-pull assembly, the launching assembly comprising a second flange ring and a launching barrel, the second flange ring being fixed to the frame opposite to the first flange ring, the launching barrel being arranged on the second flange ring and exposed to the launching box through the through hole, and the launching barrel being a conical structure; wherein the push-pull assembly is used to push the pneumatic box to drive the first flange ring to abut against the second flange ring, cooperate with the spring piece to abut the ball into the launching barrel, form a closed space in the pneumatic box, introduce gas into the pneumatic box through the air pipe to push the ball to be launched from the launching barrel.

[0007] By adopting the above technical scheme, the overall structure of the pneumatic tennis machine is simple, the cost is low, and the performance is stable. The specific effects are as follows: the cooperation of the launching box and the frame provides a stable support structure for the whole device, and the through hole on the side facilitates the exposure of the launching barrel to ensure that the ball can be smoothly launched; the cooperation of the push-pull assembly and the pneumatic assembly enables the pneumatic box to move accurately, thereby driving the first flange ring to tightly abut against the second flange ring to form a closed space, providing conditions for the establishment of gas pressure; the design of the spring piece in the pneumatic assembly can stably abut against the ball when the pneumatic box moves, and push the ball into the launching barrel under the action of gas pressure, thereby improving the stability and accuracy of launching; the combination of the second flange ring and the conical structure of the launching barrel in the launching assembly not only fixes the launching path, but also ensures the straight-line launching of the ball under the action of high-pressure gas, thereby improving the launching efficiency and direction control ability.

[0008] Optionally, the pneumatic tennis machine further comprises a ball supporting assembly, which comprises a fixing piece fixed to the launching box, a telescopic piece fixed to the fixing piece, and a ball supporting piece connected to the end of the telescopic piece away from the fixing piece and used to support the ball between the spring piece and the second flange ring, wherein when the push-pull assembly pushes the pneumatic box to move towards the second flange ring, the telescopic piece drives the ball supporting piece to perform a retraction movement to move away from the spring piece and the second flange ring.

[0009] By adopting the technical scheme, the ball supporting assembly can stably support the ball during the launching process, and avoid displacement or falling of the ball before launching. The specific effects are as follows: the fixing member firmly installs the ball supporting assembly on the launching box, ensuring the stability of the overall structure; the telescopic member can flexibly adjust the position of the ball supporting member, so that the ball is accurately supported between the spring member and the second flange ring; when the push-pull assembly pushes the pneumatic box to move towards the second flange ring, the telescopic member drives the ball supporting member to retract in time, avoiding hindering the ball from entering the launching barrel, thereby improving the launching efficiency and reliability.

[0010] Optionally, the device further comprises a connecting member, one end of which penetrates through the second flange ring, and the other end of which is arranged outside the launching box, and a through hole is arranged on the second flange ring and penetrates through the connecting member; a sleeving member is arranged outside the launching box and is adjustably sleeved on the launching barrel and the connecting member, wherein the connecting member adjustably fixes the second flange ring and the sleeving member, and the launching barrel is made of silica gel and changes the aperture of the launching barrel by moving with the sleeving member.

[0011] By adopting the above technical scheme, the cooperation of the connecting member and the sleeving member realizes the adjustable fixing of the launching barrel, so that the aperture of the launching barrel can be adjusted as needed. The specific effects are as follows: the connecting member penetrates through the second flange ring and is arranged outside the launching box for the sleeving member to penetrate and fix, thereby providing stable support and positioning for the launching barrel, ensuring the reliability of the structure; the sleeving member is arranged outside the launching box and is adjustably sleeved on the launching barrel and the connecting member, allowing the user to flexibly adjust the position and state of the launching barrel. The launching barrel is made of silica gel and has good flexibility and deformation ability, and can change the aperture by moving under the action of the sleeving member, thereby adapting to balls of different specifications or launching requirements, improving the applicability and launching precision of the device.

[0012] Optionally, the push-pull assembly comprises a telescopic cylinder member located at one end of the pneumatic box away from the spring member; and a push-pull member located between the telescopic cylinder member and the pneumatic box, and connected to the telescopic end of the telescopic cylinder member on one side and to the pneumatic box on the other side, so as to drive the push-pull member to push or pull the pneumatic box through the telescopic end of the telescopic cylinder member.

[0013] By adopting the above technical scheme, the cooperation of the telescopic cylinder member and the push-pull member can realize accurate push-pull control of the pneumatic box. The specific effects are as follows: the telescopic end of the telescopic cylinder member drives the push-pull member to move, thereby pushing or pulling the pneumatic box to tightly abut against the second flange ring, forming a closed space and providing reliable structural protection for the subsequent increase in gas pressure. In addition, this design makes the pushing and pulling action more stable and efficient, improving the accuracy and reliability of the tennis launching.

[0014] Optionally, the application further comprises a ball inlet box abutting against the launching box, for storing balls into the launching box, wherein the ball inlet box and the launching box are oppositely provided with a ball inlet hole.

[0015] By adopting the above technical scheme, the automatic ball feeding function of the pneumatic tennis machine is realized. Specifically, by setting the ball inlet box and oppositely setting the ball inlet hole between the ball inlet box and the launching box, the ball can be conveniently fed from the ball inlet box into the launching box, thereby improving the ball feeding efficiency and simplifying the operation process.

[0016] Optionally, the ball inlet box is provided with a slope piece facing the ball inlet hole, for guiding the ball to enter the launching box through the ball inlet hole.

[0017] By adopting the above technical scheme, the slope piece can effectively guide the ball to roll to the ball inlet hole position, reduce the accumulation or jamming of the ball in the ball inlet box, and improve the efficiency and reliability of the ball entering the launching box. Specifically, the ball feeding path is optimized, the operation difficulty is reduced, and the ball can smoothly enter the launching box, thereby improving the overall operation efficiency of the pneumatic tennis machine.

[0018] Optionally, the slope piece is provided with a guide groove.

[0019] By adopting the above technical scheme, the guide groove provided on the slope piece can further improve the guiding effect of the ball. The design of the guide groove makes the ball roll on the slope piece more stable and smooth, effectively reducing the possibility of the ball deviating from the predetermined path, thereby improving the success rate of the ball entering the launching box.

[0020] Optionally, the first flange ring and the second flange ring are both made of silica gel material.

[0021] By adopting the above technical scheme, the first flange ring and the second flange ring are both made of silica gel material, which can further increase the airtightness of the closed space when they abut against each other, thereby improving the overall launching performance and precision of the tennis machine.

[0022] In summary, the present application has at least one of the following beneficial technical effects:

[0023] 1. The push-pull assembly pushes the pneumatic box and the launching assembly to tightly cooperate, and the spring piece and the gas pressure in the pneumatic box are combined to realize the accurate launching of the ball, thereby effectively improving the launching precision and stability;

[0024] 2. The pneumatic principle is used to replace the traditional motor driving mode, which has the characteristics of low noise, high efficiency and environmental protection, significantly improves the use experience and reduces the maintenance cost;

[0025] 3. The overall structure is compact and easy to operate, and continuous launching of the ball can be achieved without complex assembly, providing a low-cost and stable performance solution for tennis training. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A perspective view of a pneumatic tennis machine according to an embodiment of the present application is shown in the figure;

[0027] Figure 2 An exploded view of a pneumatic tennis machine according to an embodiment of the present application is shown in the figure;

[0028] Figure 3 A perspective view of a pneumatic tennis machine according to an embodiment of the present application is shown in the figure;

[0029] Figure 4 A perspective view of a pneumatic tennis machine according to an embodiment of the present application is shown in the figure;

[0030] Figure 5 A perspective view of a pneumatic tennis machine according to an embodiment of the present application is shown in the figure.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 10, launching box; 11, frame; 12, through hole; 13, ball inlet hole; 20, push-pull assembly; 30, pneumatic assembly; 31, pneumatic box; 311, first flange ring; 32, spring member; 40, launching assembly; 41, second flange ring; 411, through hole; 42, launching cylinder; 50, ball supporting assembly; 51, fixing member; 52, telescopic member; 53, ball supporting member; 60, connecting member; 70, sleeving member; 80, ball inlet box; 81, slope member; 811, guide groove. DETAILED DESCRIPTION

[0033] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to be limiting to the present application. As used in the specification and the appended claims of the present application, the singular forms "a," "an" and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise. It will be further understood that the terms "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0034] Hereinafter, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used only for the purpose of description, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0035] The technical solutions of the embodiments of the present application are described in detail below in combination with the drawings.

[0036] Referring to Figure 1 and Figure 2 A pneumatic tennis machine disclosed in the embodiments of the present application comprises a launching box 10, a push-pull assembly 20, a pneumatic assembly 30 and a launching assembly 40. The push-pull assembly 20, the pneumatic assembly 30 and the launching assembly 40 are sequentially and oppositely accommodated in the inner side end (located in the inner lower end) of the launching box 10. One ball is accommodated in the launching box 10 at a time and falls between the pneumatic assembly 30 and the launching assembly 40. The pneumatic assembly 30 is pushed by the push-pull assembly 20 to abut against the launching assembly 40 to form a closed space, and at the same time, the ball is abutted into the launching assembly 40. The air pipe (not shown in the figure and the corresponding figure shows the hole slot connected with the air pipe) connected with the outer side of the pneumatic assembly 30 is used to pass air into the closed space to increase the gas pressure, so as to push the ball to be launched from the launching assembly 40, thereby realizing the automatic ball launching of the pneumatic tennis machine.

[0037] Among them, the frame 11 is arranged in the inner side of the launching box 10, which provides a stable support structure for the whole device. The through hole 12 is arranged on the side of the launching box 10, which is used for the launching assembly 40 to be exposed, so as to ensure that the ball can be smoothly launched.

[0038] Referring to Figure 3 The pneumatic assembly 30 comprises a pneumatic box 31 and a spring member 32. One end of the pneumatic box 31 is connected with the push-pull assembly 20, and the other end is provided with a first flange ring 311 to pass through the inner side space of the pneumatic box 31. The air pipe connected with the side of the pneumatic box 31 is used to pass air into the inner side space of the pneumatic box 31. One end of the spring member 32 penetrates through the first flange ring 311 and is fixed in the pneumatic box 31, and the other end is exposed outside the first flange ring 311 and is used to abut against the ball. In this embodiment, the pneumatic box 31 can be made of aluminum alloy material, which has good pressure resistance and light weight characteristics.

[0039] Referring to Figure 4 The launching assembly 40 comprises a second flange ring 41 and a launching cylinder 42. The second flange ring 41 is fixed on the frame 11 opposite to the first flange ring 311. The launching cylinder 42 is arranged through the second flange ring 41 and is exposed outside the launching box 10 through the through hole 12. Among them, the launching cylinder 42 can be made of silica gel material, which has good elasticity and sealing performance and can meet the launching requirements of tennis balls of different specifications.

[0040] The launching barrel 42 is designed as a conical structure with a smaller top caliber and a larger bottom caliber, which can enhance the restraint effect of the launching barrel on the ball, ensure the stability of the direction and speed of the ball during launching, and make the ball more easily pushed by the gas pressure and smoothly launched.

[0041] It is worth mentioning here that the push-pull assembly 20 is used to push the pneumatic box 31 to tightly abut against the second flange ring 41, and the first flange ring 311 and the second flange ring 41 are both made of silica gel or rubber material, and further cooperate with the spring member 32 to abut the ball into the launching barrel 42, so as to form a closed space in the pneumatic box 31, and the gas is introduced into the pneumatic box 31 through the air pipe to increase the gas pressure, so as to push the ball to be launched from the launching barrel 42.

[0042] The push-pull assembly 20 includes a telescopic cylinder member and a push-pull member. The telescopic cylinder member is located at one end of the pneumatic box 31 away from the spring member 32, and a standard cylinder or a micro cylinder can be selected according to the actual demand to adjust the stroke and thrust parameters, and a piston rod and a piston are arranged inside the telescopic cylinder member. The piston rod is connected with the piston in the cylinder barrel, and the piston rod is pushed to extend or retract by the gas pressure. The push-pull member is located between the telescopic cylinder member and the pneumatic box 31, and one side is connected with the telescopic end of the telescopic cylinder member, and the other side is connected with the pneumatic box 31, so as to drive the push-pull member to push and pull the pneumatic box 31 through the telescopic end of the telescopic cylinder member. It is explained here that in the embodiment, the specific structure of the push-pull assembly 20 is not limited, as long as the push-pull function can be realized.

[0043] The implementation principle of the embodiment is that the cooperation of the pneumatic assembly 30 and the push-pull assembly 20 realizes the efficient launching of the tennis ball. The push-pull assembly 20 pushes the pneumatic box 31 to be close to the launching assembly 40, and after forming a closed space, the air pipe fills the pneumatic box 31 with gas, and the gas pressure acts on the ball to quickly push the ball out of the launching barrel 42. The whole process does not need complex mechanical transmission mechanism, and the structure is simple and easy to maintain. At the same time, by using the advantages of pneumatic technology, the noise and energy consumption of the equipment are significantly reduced, and the use experience is improved. In addition, the adjustable structure of the silica gel material launching barrel 42 further enhances the applicability and flexibility of the equipment, and meets the training needs in different scenes.

[0044] Further, referring to Figure 2 and Figure 3The pneumatic tennis machine further comprises a ball supporting assembly 50, which comprises a fixing member 51, an extension member 52 and a ball supporting member 53. The fixing member 51 is fixed on the launching box 10, the extension member 52 is fixed on the fixing member 51, and the ball supporting member 53 is connected to the end of the extension member 52 away from the fixing member 51, and is used to support the ball between the spring member 32 and the second flange ring 41 with the extension of the extension member 52. When the push-pull assembly 20 pushes the pneumatic box 31 to move towards the second flange ring 41, the extension member 52 drives the ball supporting member 53 to perform a retraction movement to move away from the spring member 32 and the second flange ring 41; correspondingly, when the push-pull assembly 20 pushes the pneumatic box 31 to move away from the second flange ring 41, the extension member 52 drives the ball supporting member 53 to perform a lifting movement to extend into the spring member 32 and the second flange ring 41 to continue to support the new ball.

[0045] The fixing member 51 can be in the form of a metal bracket or a plastic buckle to ensure stable installation and easy disassembly. The extension member 52 can be selected from an electric push rod or a hydraulic rod to adjust the extension speed and stroke range according to actual needs. In addition, the extension member 52 can be connected with the push-pull assembly 20 to move synchronously with the push-pull assembly 20. Specifically, when the push-pull assembly 20 moves towards the pneumatic assembly 30, the extension member 52 is retracted to further drive the ball supporting member 53 to move downward without affecting the launching of the ball. When the push-pull assembly 20 moves away from the pneumatic assembly 30, the extension member 52 is extended to further drive the ball supporting member 53 to move upward between the push-pull assembly 20 and the pneumatic assembly 30. Of course, the connection structure of the extension member 52 and the push-pull assembly 20 is not limited.

[0046] The ball supporting member 53 can be designed as an arc-shaped groove to accommodate different sizes of balls and provide stable support. In this way, through the design of the ball supporting assembly 50, the problem of launching failure or damage caused by position deviation of the ball during launching is effectively avoided, and the reliability and safety of the equipment are improved.

[0047] Further, referring to Figure 3 and Figure 4 The pneumatic tennis machine further comprises a connecting member 60 and a sleeving member 70. One end of the connecting member 60 penetrates the second flange ring 41, and the other end penetrates out of the launching box 10. Correspondingly, the second flange ring 41 is provided with a penetration hole 411 penetrated by the connecting member 60. The sleeving member 70 is located outside the launching box 10 and is adjustably sleeved on the launching barrel 42 and the connecting member 60 relative to the launching box 10. The connecting member 60 adjustably fixes the second flange ring 41 and the sleeving member 70. The launching barrel 42 is made of silica gel and changes the aperture of the launching barrel 42 with the sleeving movement of the sleeving member 70.

[0048] The connecting member 60 can be selected from a threaded rod or a pin structure to ensure firm fixation and easy adjustment. The structure of the sleeving member 70 can be asFigure 4 In the assembled state, the sleeve is arranged on the launching barrel 42 and the connecting piece 60, and the position of the sleeve 70 on the launching barrel 42 is adjusted by fixing the connecting piece 60, and based on the fact that the launching barrel 42 is made of silica gel and has a conical structure, the movement of the sleeve 70 on the launching barrel 42 can change the aperture in the launching barrel 42, and the gas pressure in the pneumatic box 31 can adjust the launching speed of the ball, and the ball of different sizes can be launched.

[0049] Further, in order to realize the continuous storage of the ball in the pneumatic box 31, referring to Figure 1 and Figure 2 The pneumatic tennis machine further comprises a ball feeding box 80 abutting against the launching box 10, for continuously storing the ball into the launching box 10.

[0050] Wherein, the ball feeding hole 13 is oppositely arranged on the ball feeding box 80 and the launching box 10, so that the ball can smoothly enter the launching box 10 from the ball feeding box 80, and the efficiency and convenience of the ball supplement are improved.

[0051] Further, referring to Figure 5 The slope piece 81 is arranged in the ball feeding box 80 and faces the ball feeding hole 13, for guiding the ball to enter the launching box 10 through the ball feeding hole 13.

[0052] Further, the guide groove 811 is further arranged on the slope piece 81, the guide groove 811 is a straight groove, and the depth and width can be optimized according to the diameter of the ball, so as to further improve the guiding efficiency of the ball.

[0053] In summary, the pneumatic tennis machine disclosed in the embodiments of the present application can realize the accurate launching of the ball by the push-pull assembly 20 pushing the pneumatic box 31 to tightly cooperate with the launching assembly 40, in combination with the spring 32 and the gas pressure in the pneumatic box 31, so as to effectively improve the launching precision and stability; the ball supporting assembly 50 can stably support the ball during the launching process, so as to avoid the displacement or falling of the ball before the launching; the cooperation of the connecting piece 60 and the sleeve 70 realizes the adjustable fixing of the launching barrel 42, so that the aperture of the launching barrel 42 can be adjusted as needed; the arrangement of the slope piece 81 can effectively guide the ball to roll to the position of the ball feeding hole 13, reduce the accumulation or jamming of the ball in the ball feeding box 80, and improve the efficiency and reliability of the ball entering the launching box 10; the arrangement of the guide groove 811 on the slope piece 81 can further improve the guiding effect of the ball; the overall structure design is compact and easy to operate, and the continuous launching of the ball can be realized without complex assembly, so as to provide a tennis training solution with low cost and stable performance for users.

[0054] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A pneumatic tennis machine, characterized in that, The utility model relates to a kind of ball launching device, including: Emitting box (10), inside is provided with frame (11), and side is provided with through-hole (12); Push-pull assembly (20), located the inside end of the emitting box (10); Pneumatic assembly (30), located the inside end of the emitting box (10), with the push-pull assembly (20) same side opposite and connect, the pneumatic assembly (30) includes: pneumatic box (31) and spring piece (32), one end of the pneumatic box (31) connects the push-pull assembly (20), the other end is provided with first flange ring (311) to pass through the inside space of the pneumatic box (31), the pneumatic box (31) side is connected with air pipe, to be inhaled into gas into the inside space of the pneumatic box (31), one end of the spring piece (32) is fixed in the pneumatic box (31) and passes through the first flange ring (311), the other end is exposed to the first flange ring (311) and abuts ball; Firing assembly (40), located the inside end of the emitting box (10), is arranged in the spring piece (32) away from the one end of the push-pull assembly (20), the firing assembly (40) includes second flange ring (41) and launch cylinder (42), the second flange ring (41) is fixed in the frame (11) relative to the first flange ring (311), the launch cylinder (42) is arranged in the second flange ring (41), and is exposed to the emitting box (10) via the through-hole (12), and the launch cylinder (42) is conical structure; Wherein, the push-pull assembly (20) is used to push the pneumatic box (31) and drive the first flange ring (311) to abut the second flange ring (41), cooperate the spring piece (32) and abut ball to the launch cylinder (42), form airtight space in the pneumatic box (31), inhaled into gas into the pneumatic box (31) via the air pipe, to push ball and launch from the launch cylinder (42).

2. The pneumatic tennis machine according to claim 1, characterized in that Also including: Ball support assembly (50), including: Fixed part (51), fixed in the emitting box (10); Telescopic part (52), fixed in the fixed part (51); Ball supporting part (53), connects the one end of the telescopic part (52) away from the fixed part (51), for supporting ball between the spring piece (32) and the second flange ring (41) with the telescopic part (52) telescopic, wherein when the push-pull assembly (20) pushes the pneumatic box (31) and moves to the second flange ring (41), the telescopic part (52) drives the ball supporting part (53) to perform retraction movement, to be away from the spring piece (32) and the second flange ring (41).

3. The pneumatic tennis machine according to claim 1, characterized in that Also including: Connecting piece (60), one end penetrates the second flange ring (41), the other end is arranged out of the emitting box (10), corresponding the second flange ring (41) is provided with through hole (411) penetrated via the connecting piece (60); A sleeve set (70) is located outside the launching box (10) and adjustably sleeved on the launching barrel (42) and the connecting piece (60) relative to the launching box (10), wherein the connecting piece (60) adjustably fixes the second flange ring (41) and the sleeve set (70), the launching barrel (42) is made of silica gel material, and the aperture of the launching barrel (42) is changed with the sleeving movement of the sleeve set (70).

4. The pneumatic tennis machine according to claim 1, wherein, The push-pull assembly (20) comprises: A telescopic air cylinder piece is located at one end of the pneumatic box (31) away from the spring piece (32); A push-pull piece is located between the telescopic air cylinder piece and the pneumatic box (31), and one side surface is connected to the telescopic end of the telescopic air cylinder piece, and the other side surface is connected to the pneumatic box (31), so as to drive the push-pull piece to push and pull the pneumatic box (31) through the telescopic end of the telescopic air cylinder piece.

5. The pneumatic tennis machine according to claim 1, wherein, Further comprising: A ball inlet box (80) abuts against the launching box (10) and is used for storing balls into the launching box (10), and the ball inlet box (80) and the launching box (10) are oppositely provided with a ball inlet hole (13).

6. The pneumatic tennis machine according to claim 5, characterized in that A slope piece (81) is arranged in the ball inlet box (80) and faces the ball inlet hole (13), and is used for guiding balls to enter the launching box (10) through the ball inlet hole (13).

7. The pneumatic tennis machine according to claim 6, characterized in that A guide groove (811) is arranged on the slope piece (81).

8. The pneumatic tennis machine according to claim 1, wherein, The first flange ring (311) and the second flange ring (41) are both made of silica gel material.

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