CN113101626B

CN113101626B - Tennis serving device

Info

Publication number: CN113101626B
Application number: CN202110567702.8A
Authority: CN
Inventors: 王翊超
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2022-06-17
Anticipated expiration: 2041-05-24
Also published as: CN113101626A

Abstract

A tennis ball serving device solves the problems that the existing tennis ball serving equipment has single function and low application range, and cannot adjust different training modes according to the levels of different learners to improve the tennis skill of the learners; the racket comprises a lifting frame, an angle-adjustable launching barrel, a driving shaft and a racket frame capable of swinging back and forth, wherein an ejecting rod is arranged in the launching barrel, an ejecting rack is fixedly connected to the ejecting rod, an incomplete gear is meshed with the ejecting rack, a first regular polygon prism is coaxially and fixedly connected to the incomplete gear, the first regular polygon prism is rotatably connected with a shell, a plurality of driving teeth which are uniformly distributed on the circumference are arranged on the driving shaft, the front ends of the driving teeth are flush, the lengths of the rear ends of the driving teeth are sequentially increased, and an adjustable driven gear is arranged on the first regular polygon prism; the invention has various functions, can switch different modes for training, can adjust the training difficulty and the training intensity according to the level of a learner, has wide application range and is convenient for improving the tennis technique of the learner.

Description

Tennis serving device

Technical Field

The invention belongs to the field of auxiliary sports equipment, and particularly relates to a tennis serving device.

Background

In modern society, with the improvement of living standard of substances, people pay more and more attention to life quality and living quality, and the hot tide of civil fitness exercise is more and more severe. Tennis sports is popular with the young in recent years, but for beginners, the technology needs to be improved quickly in a short time, advanced tennis training facilities are difficult to achieve, and equipment in a tennis stadium still has large defects at present, particularly tennis serving equipment has single function and low application range, and different training modes cannot be adjusted according to the levels of different learners to improve the tennis technology of the learners.

Disclosure of Invention

Aiming at the technical problems, the invention provides a tennis serving device, which solves the problems that the existing tennis serving equipment has single function and low application range, and cannot adjust different training modes according to the levels of different learners to improve the tennis technique of the learners.

In order to achieve the above object, the present invention provides the following technical solutions; the launching device comprises a lifting frame, a launching tube with an adjustable angle is rotatably connected to the lifting frame, a shell is arranged above the launching tube, a ball storage device is arranged above the shell, a ball inlet tube is fixedly communicated between the shell and the launching tube, a ball outlet tube is fixedly communicated between the shell and the ball storage device, a ball feeding rotary disc is rotatably connected in the shell, a plurality of grooves which are uniformly distributed in the circumferential direction are formed in the edge of the ball feeding rotary disc, a launching rod which slides along the axial direction of the launching tube is arranged in the launching tube, an elastic head is fixedly connected to the head end of the launching rod, a first spring sleeved on the launching rod is arranged between the elastic head and the launching tube, a launching rack is fixedly connected to the outer part of the launching tube, the launching rack is meshed with an incomplete gear, and the incomplete gear is coaxially and fixedly connected with a ratchet wheel, a first belt wheel and a first regular polygon prism, the first regular polygon prism is rotatably connected with the shell, a pawl is arranged on the ratchet wheel in a matched mode to form a ratchet wheel and pawl mechanism, a driving motor is fixedly installed on the lifting frame, the output end of the driving motor is fixedly connected with a driving shaft, a plurality of driving teeth which are evenly distributed on the circumference are arranged on the driving shaft, the front ends of the driving teeth are flush, the lengths of the rear ends of the driving teeth are sequentially increased in an increasing mode, a driven gear capable of adjusting the position along the axial direction of the first regular polygon prism is arranged on the first regular polygon prism and can be meshed with the driving teeth to rotate, a geneva mechanism is rotatably connected onto the shell, the output end of the geneva mechanism is fixedly connected with the ball conveying turntable in a coaxial mode, a second belt wheel is fixedly connected to the input end of the geneva mechanism in a coaxial mode, and a first transmission belt is arranged between the first belt wheel and the second belt wheel in a matched mode;

a positioning plate is fixedly connected to the launching barrel, a first worm wheel is fixedly connected to the positioning plate, and a first worm which is rotatably connected with the shell and can rotate in a reciprocating manner is meshed with the first worm wheel;

the utility model discloses a safety device for automobile seat, including first worm, first gear, the first gear meshing has reciprocal rack, fixedly connected with L type pole on the reciprocal rack, fixedly connected with arc on the lift frame, coaxial rotation is connected with the regulating plate on the arc, threaded connection has the locking screw that can fix a position with the arc on the regulating plate, sliding connection has first slider on the regulating plate, it is connected with the guide block to rotate on the first slider, the vertical sliding connection of vertical section of guide block and L type pole, fixedly connected with locating lever on the first slider, fixedly connected with driving pin on the locating lever, the center of arc is rotated and is connected with the eccentric wheel, the eccentric groove has been seted up on the eccentric wheel, driving pin and eccentric groove sliding connection.

Preferably, the lifting frame is rotatably connected with an adjusting screw rod, the adjusting screw rod is provided with a positioning block in a threaded fit manner, the positioning block is rotatably connected with a first rotating shaft, the first rotating shaft is fixedly connected with the driven gear, and the first rotating shaft is connected with the first regular polygon prism in a sliding manner.

Preferably, a second gear is fixedly connected to the rotation center of the eccentric wheel, a second polygon prism is rotatably connected to the lifting frame, a third gear capable of being adjusted along the axial direction of the second polygon prism is arranged on the second polygon prism, a control lead screw in sliding connection with the lifting frame is rotatably connected to the third gear, and an adjusting nut in rotating connection with the lifting frame is in threaded fit on the control lead screw.

Preferably, a first bevel gear is fixedly connected to the second polygonal column, the first bevel gear is meshed with a second bevel gear, the second bevel gear is coaxially and fixedly connected with a third belt wheel rotatably connected with the lifting frame, the output end of the driving motor is fixedly connected with a fourth belt wheel, and the third belt wheel is connected with the fourth belt wheel through a second transmission belt in a matched mode.

Preferably, a rotatable second rotating shaft is arranged on the lifting frame, an adjusting rod is fixedly connected to the second rotating shaft, one end, far away from the second rotating shaft, of the adjusting rod is rotatably connected with a roller, an inclined surface is arranged on the lifting frame, a second sliding block capable of adjusting the position in a sliding mode is arranged in the direction of the inclined surface of the lifting frame, a racket frame is hinged to the second sliding block, a slide way matched with the roller is arranged on one side of the racket frame, an outlet communicated with the groove is formed in the shell, a slope surface inclining towards the outlet is formed in the groove, a receiving opening which corresponds to the outlet and is obliquely arranged is formed in the lifting frame, a channel with an outlet end corresponding to the racket frame is integrally connected to the receiving opening, and a first baffle and a second baffle which can alternately vertically lift are arranged in the channel.

Preferably, a pinion which can be driven by a driving motor 17 is rotatably connected to the lifting frame, a second worm, a cam and a fifth belt wheel are coaxially and fixedly connected to the pinion, the second worm is meshed with a second worm wheel which is rotatably connected to the lifting frame, a sixth belt wheel is fixedly connected to the second rotating shaft, the fifth belt wheel is connected with the sixth belt wheel through a third transmission belt, ejector rods which are vertically and slidably connected with the moving frame are fixedly connected to the lower ends of the first baffle and the second baffle, one of the ejector rods corresponds to the cam to form a mechanism for downward movement of the ejector rod, a second spring which can reset the ejector rod is sleeved on the ejector rod, lifting racks are fixedly connected to the two ejector rods, a conduction gear is meshed between the two lifting racks together, and the conduction gear is rotatably connected with the lifting frame.

Compared with the prior art, the invention has the beneficial effects that: 1) the device can launch tennis balls in different forms through the launching tube and the racket frame, and the two modes can be switched through the adjustment of the positioning block; 2) the angle and the height of the launching tube can be adjusted when the ball is launched, and different launching arcs are formed; 3) the angle of the launching tube can be adjusted to be a fixed mode or a swinging mode, and the uncertainty of launching arc lines is formed by the serve in the swinging mode, so that the training difficulty is increased; 4) the swing angle range of the launching tube in the swing mode can be adjusted through an adjusting plate, and the training mode can be adjusted according to different levels of learners; 5) the emission frequency of the tennis ball is adjusted through the meshing of different driving teeth and driven gears, so that the training intensity of a trainer is adjusted; 6) when the racket frame is used for serving, the coverage area of the racket frame can be adjusted through the second sliding block so as to be convenient for contacting and launching the falling tennis balls; 7) the swing angle range of the racket frame can be adjusted by adjusting the length of the adjusting rod and the position of the second sliding block, so that different ball serving forces can be achieved; the tennis training device is novel in structure, ingenious in conception, convenient to use, multiple in functions, capable of switching different modes to train, capable of adjusting training difficulty and training strength according to the level of a learner, wide in application range, convenient for improving the tennis technique of the learner and capable of achieving the purpose of training by a single person.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural view of the launching principle of two ball launching structures on the lifting frame.

Fig. 3 is a schematic view of the present invention with the driven gear positioned to engage a different number of drive teeth.

Fig. 4 is a schematic structural view of the first baffle and the second baffle moving up and down alternately to deliver tennis balls and swatting the tennis balls with the racket frame.

Fig. 5 is an enlarged schematic view of a portion a in fig. 4.

Fig. 6 is a schematic view of the reciprocating rack of the present invention, which performs reciprocating motion and has an adjustable reciprocating stroke.

Fig. 7 is a schematic structural view of the ejector rod ejecting the tennis ball in the launching tube.

FIG. 8 is a schematic view showing the structure of the angle adjustment of the launch canister according to the present invention.

Fig. 9 is a schematic structural diagram of the connection between the ball feeding turntable and the sheave mechanism in the invention.

Fig. 10 is an exploded view of the driven sheave position adjustment on the first regular polygon prism of the present invention.

Fig. 11 is a schematic structural view of the third gear being driven and its position being adjusted according to the present invention.

In the figure: 1-lifting frame, 2-launching tube, 3-shell, 4-ball storage device, 5-ball inlet tube, 6-ball outlet hall, 7-ball feeding turntable, 8-groove, 9-ejection rod, 10-elastic head, 11-first spring, 12-ejection rack, 13-incomplete gear, 14-ratchet wheel, 15-first belt wheel, 16-first regular polygon prism, 17-driving motor, 18-driving shaft, 19-driving tooth, 20-driven gear, 21-sheave mechanism, 22-second belt wheel, 23-adjusting screw rod, 24-positioning block, 25-first rotating shaft, 26-positioning plate, 27-first worm wheel, 28-first worm, 29-first gear, 30-reciprocating rack, 31-L-shaped plate, 32-arc plate, 33-adjusting plate, 34-locking screw, 35-first sliding block, 36-guide block, 37-positioning rod, 38-eccentric wheel, 39-eccentric groove, 40-second gear, 41-second polygon prism, 42-third gear, 43-control screw rod, 44-adjusting nut, 45-first bevel gear, 46-second bevel gear, 47-third pulley, 48-fourth pulley, 49-second rotating shaft, 50-adjusting rod, 51-roller, 52-second sliding block, 53-racket frame, 54-slideway, 55-outlet, 56-receiving port, 57-channel, 58-first baffle, 59-second baffle, 60-pinion, 61-cam, 62-fifth belt wheel, 63-sixth belt wheel, 64-mandril, 65-second spring, 66-lifting rack and 67-transmission gear.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

Referring to fig. 1-11, the present invention includes a lifting frame 1, an angle-adjustable launch barrel 2 is rotatably connected to the lifting frame 1, a housing 3 is disposed above the launch barrel 2, a ball storage device 4 is disposed above the housing 3, a ball inlet tube 5 is fixedly communicated between the housing 3 and the launch barrel 2, a ball outlet tube 6 is fixedly communicated between the housing 3 and the ball storage device 4, a ball feeding turntable 7 is rotatably connected to the housing 3, a plurality of grooves 8 are uniformly distributed on the circumference of the ball feeding turntable 7, a launch rod 9 sliding along the axial direction of the launch rod is disposed inside the launch barrel 2, an elastic head 10 is fixedly connected to the head end of the launch rod 9, a first spring 11 sleeved on the launch rod 9 is disposed between the elastic head 10 and the launch barrel 2, a launch rack 12 is fixedly connected to the exterior of the launch barrel 2 by the launch rod 9, the ejection rack 12 is engaged with an incomplete gear 13, the incomplete gear 13 is coaxially and fixedly connected with a ratchet wheel 14, a first belt wheel 15 and a first regular polygon prism 16, the first regular polygon prism 16 is rotationally connected with the shell 3, the ratchet wheel 14 is provided with a pawl in a matching way to form a ratchet wheel and pawl mechanism, the lifting frame 1 is fixedly provided with a driving motor 17, the output end of the driving motor 17 is fixedly connected with a driving shaft 18, the driving shaft 18 is provided with a plurality of driving teeth 19 which are uniformly distributed along the circumference, the front ends of the driving teeth 19 are flush, the lengths of the rear ends are sequentially increased, the first regular polygon prism 16 is provided with a driven gear 20 which can be axially adjusted, the driven gear 20 can be engaged with the driving teeth 19 to rotate, the shell 3 is rotationally connected with a grooved wheel mechanism 21, and the output end of the grooved wheel mechanism 21 is coaxially and fixedly connected with the ball-feeding turntable 7, the input end of the geneva gear 21 is coaxially and fixedly connected with a second belt wheel 22, and a first transmission belt is arranged between the first belt wheel 15 and the second belt wheel 22 in a matching manner.

When the tennis ball launching device is used, the lifting frame 1 is moved to a tennis ball training field and fixed, then the height of the launching tube 2 can be adjusted through the lifting frame 1, so that the height of a service ball can be adjusted conveniently, all tennis balls to be launched are placed in the tennis ball storage device 4, when tennis training is performed, the driving motor 17 is started, the driving motor 17 can drive the driving shaft 18 fixedly connected with the driving motor to rotate, the driving shaft 18 can drive the driven gear 20 to rotate when rotating, the driven gear 20 can drive the first regular polygon prism 16 to rotate, the ratchet 14 fixedly connected with the first regular polygon prism 16, the incomplete gear 13 and the first belt wheel 15 rotate together, the incomplete gear 13 can drive the launching rack 12 and the launching rod 9 fixedly connected with the launching rack 12 to move leftwards when rotating, the first spring 11 at the moment can be slowly compressed, and meanwhile, the first belt wheel 15 rotates to drive the second belt wheel 22 through the first transmission belt, the second belt wheel 22 drives the ball feeding rotary table 7 to rotate through the geneva gear 21, the ball feeding rotary table 7 can convey the tennis balls in the groove 8 from the ball inlet pipe 5 to the launching tube 2 through the ball outlet pipe 6 when rotating once, the tennis balls in the ball storage 5 can also enter the groove 8 through the ball outlet pipe 6, after the ejection rack 12 is disengaged from the incomplete gear 13, under the action of the first spring 11, the ejection rod 9 can be quickly reset to eject the tennis balls in the launching tube 2, when the driven gear 20 is engaged with the driving teeth 19 at different positions through adjusting the position of the driven gear, the driving shaft 18 rotates for a circle, the driven gear 20 can rotate at different angles, the position can be locked through the ratchet and pawl mechanism after rotating, thereby the ball serving frequency can be adjusted, the tennis ball launching angle and the running arc of the emitted tennis balls can be adjusted through adjusting the angle of the launching tube 2, and the height of the lifting frame 1 can be adjusted at the same time, the tennis ball serving angles and arcs at different heights can be adjusted, so that training of a trainer in different modes is realized.

As shown in fig. 3 and 10, in order to adjust the position of the driven gear 20 on the first regular polygon prism 16, so as to implement emission with different frequencies, an adjusting screw 23 is rotatably connected to the lifting frame 1, a positioning block 24 is screwed on the adjusting screw 23, a first rotating shaft 25 is rotatably connected to the positioning block 24, the first rotating shaft 25 is fixedly connected to the driven gear 20, and the first rotating shaft 25 is slidably connected to the first regular polygon prism 16.

The adjusting screw 23 and the positioning block 24 form a screw nut structure, the screw nut structure has self-locking performance, when the adjusting screw 23 is rotated, the positioning block 24 can move and adjust along the axial direction of the first regular polygon prism 16, the adjusted position is in a stable state, and when the driven sheave 20 rotates, the first rotating shaft 25 and the first regular polygon prism 16 connected with the first rotating shaft 25 in a sliding manner can be driven to rotate on the positioning block 24.

As shown in fig. 8, in order to adjust the angle of the launch canister 2, a positioning plate 26 is fixedly connected to the launch canister 2, a first worm wheel 27 is fixedly connected to the positioning plate 26, and a first worm 28 which is rotatably connected to the housing 3 and can rotate back and forth is engaged with the first worm wheel 27.

The worm and gear mechanism has self-locking performance, when the launching angle of the launching tube 2 is adjusted, the first worm wheel 28 can be driven to rotate by rotating the first worm 28, the first worm wheel 28 rotates to drive the positioning plate 26 and the launching tube 2 fixedly connected with the positioning plate to rotate for adjustment, the first worm 18 rotates for different circles, and the launching tube 2 can also be adjusted to different angles.

As shown in fig. 6, in order to realize that the launching tube 2 can swing back and forth and the swing angle can be adjusted, so as to realize the difficulty of uncertainty increase training of the ball trajectory launching angle when launching the ball, the first worm 28 is fixedly connected with a first gear 29, the first gear 29 is engaged with a reciprocating rack 30, the reciprocating rack 30 is fixedly connected with an L-shaped rod 31, the lifting frame 1 is fixedly connected with an arc plate 32, the arc plate 32 is coaxially and rotatably connected with an adjusting plate 33, the adjusting plate 33 is in threaded connection with a locking screw 34 which can be positioned with the arc plate 32, the adjusting plate 33 is slidably connected with a first sliding block 35, the first sliding block 35 is rotatably connected with a guide block 36, the guide block 36 is vertically and slidably connected with the vertical section of the L-shaped rod 31, the first sliding block 35 is fixedly connected with a positioning rod 37, the positioning rod 37 is fixedly connected with a driving pin, an eccentric wheel 38 is rotatably connected to the center of the arc plate 32, an eccentric groove 39 is formed in the eccentric wheel 38, and the driving pin is slidably connected with the eccentric groove 39.

During training, when difficulty needs to be increased, the eccentric wheel 38 can be driven to rotate, when the eccentric wheel 38 rotates, the eccentric groove 39 is matched with the driving pin, so that the first sliding block 35 reciprocates on the adjusting plate 33, the first sliding block 35 reciprocates and drives the L-shaped rod 31 to reciprocate through the guide block 36, finally, the reciprocating motion of the reciprocating rack 30 drives the first gear 29 to reciprocate, and at the moment, the launching tube 2 can continuously swing in a reciprocating mode; in addition, when the adjusting plate 33 is in a horizontal state, the reciprocating stroke of the first sliding block 35 is the largest, and the swing angle range of the launching tube 2 is the largest at this time, after the position of the adjusting plate 33 is adjusted by rotating the adjusting plate 33, the reciprocating stroke of the first sliding block 35 in the horizontal direction is reduced, when the first sliding block 35 reciprocates along the adjusting plate 33, the guide block 36 does not do horizontal motion and vertical motion, at this time, the guide block 36 drives the L-shaped rod 31 to do reciprocating motion, the vertical section of the L-shaped rod 31 vertically slides in the guide block 36, and after the position of the adjusting plate 33 is adjusted by rotating the adjusting plate 33, the locking screw 34 and the arc-shaped plate 32 are matched and locked.

Further, as shown in fig. 6 and 11, in order to realize switching between two modes of emission in a certain angle state and in a swing state, a second gear 40 is fixedly connected to a rotation center of the eccentric wheel 38, a second polygonal column 41 is rotatably connected to the lifting frame 1, a third gear 42 which can be adjusted along an axial direction of the second polygonal column 41 is arranged on the second polygonal column 41, a control screw 43 which is connected with the lifting frame 1 in a left-right sliding manner is rotatably connected to the third gear 42, and an adjusting nut 44 which is connected with the lifting frame 1 in a rotating manner is in threaded fit on the control screw 43.

When the third gear 42 and the second gear 40 are in a meshed state, the third gear 42 and the second gear 40 meshed therewith can be driven to rotate by driving the second polygon prism 41 to rotate, at this time, the launching tube 2 is in a swinging state, when the adjusting nut 44 is rotated to enable the control screw 43 to slide left and right on the lifting frame 1 to adjust the position, the control screw 43 can drive the third gear 42 to slide on the second polygon prism 41 and be separated from the second gear 40, at this time, the angle of the launching tube 2 is in a fixed state.

As shown in fig. 11, in order to realize that the driving motor 17 drives the second polygonal column 41 to rotate, a first bevel gear 45 is fixedly connected to the second polygonal column 41, the first bevel gear 45 is engaged with a second bevel gear 46, the second bevel gear 46 is coaxially and fixedly connected with a third belt pulley 47 rotationally connected to the lifting frame 1, an output end of the driving motor 17 is fixedly connected with a fourth belt pulley 48, and the third belt pulley 47 is connected and matched with the fourth belt pulley 48 through a second transmission belt.

As shown in fig. 4 and 5, in order to increase the applicability of the device in different serving modes, a rotatable second rotating shaft 49 is provided on the lifting frame 1, an adjusting rod 50 is fixedly connected to the second rotating shaft 49, one end of the adjusting rod 50 away from the second rotating shaft 49 is rotatably connected with a roller 51, the lifting frame 1 is provided with an inclined surface, a second slider 52 capable of adjusting the position in a sliding manner is provided along the direction of the inclined surface of the lifting frame 1, a racket frame 53 is hinged to the second slider 52, a slideway 54 matched with the roller 51 is provided on one side of the racket frame 53, an outlet 55 communicated with the groove 8 is provided on the housing 3, the groove 8 is provided with a slope inclined toward the outlet 55, a receiving opening 56 corresponding to the outlet 55 and arranged in an inclined manner is provided on the lifting frame 1, a channel 57 having an integral outlet end corresponding to the racket frame 53 is connected to the receiving opening 56, the channel 57 is internally provided with a first baffle plate 58 and a second baffle plate 59 which can alternately vertically lift.

The adjusting rod 50 and the racket frame 53 form a crank rocker mechanism, the racket frame 53 launches tennis balls by utilizing the quick return characteristic of the crank rocker, when the racket frame 53 is utilized for serving, the second rotating shaft 49 needs to be driven to rotate, the second rotating shaft 49 drives the adjusting rod 50 to rotate, the adjusting rod 50 drives the racket frame 53 to rotate when rotating, the roller 51 rolls in the slideway 54, the shell 3 is provided with a blocking cover matched with the outlet 55, when the launching tube 2 is used for serving, the blocking cover seals the outlet 55, when the racket frame 53 is used for serving, the blocking cover is taken down from the outlet 55, tennis balls in the ball storage device 4 enter the groove 8 with the slope through the ball inlet tube 6 and then roll down from the outlet 55 to the receiving opening 56, and then the tennis balls are discharged from the channel 57 one by one and slide down to the upper part of the racket frame 53 through the first baffle 58 and the second baffle 59 which are lifted up and down alternately, then it is patted out by the racket frame 53; wherein, the length of the adjusting rod 50 can be adjusted, and the swing angle range of the racket frame 53 can be adjusted by adjusting the length of the adjusting rod 50, so as to adjust the racket dynamics of the racket frame 53; furthermore, a positioning screw rod is fixedly connected to the second slider 52, a positioning nut in threaded fit with the positioning screw rod is rotatably connected to the lifting frame 1, and the positions of the positioning screw rod and the second slider 52 fixedly connected to the positioning screw rod on the inclined plane can be adjusted by rotating the positioning nut, so that the swing angle and the racket force of the racket frame 53 can be adjusted, and the coverage of the racket frame 53 can be adjusted for the position of a ball falling point of a tennis ball.

In order to realize that the tennis ball can be conveyed and the tennis ball can be played at the same time by the racket frame 53, the lifting frame 1 is rotatably connected with a pinion 60 which can be driven by a driving motor 17, the pinion 60 is coaxially and fixedly connected with a second worm, a cam 61 and a fifth belt wheel 62, the second worm is engaged with a second worm wheel which is rotatably connected with the lifting frame 1, the second rotating shaft 49 is fixedly connected with a sixth belt wheel 63, the fifth belt wheel 62 is connected with the sixth belt wheel 63 through a third belt, the lower ends of the first baffle plate 58 and the second baffle plate 59 are fixedly connected with ejector rods 64 which are vertically and slidably connected with the moving frame, one ejector rod 64 and the cam 61 correspond to form a mechanism for downward movement of the ejector rod, the ejector rod 64 is sleeved with a second spring 65 which can reset the ejector rod 64, lifting racks 66 are fixedly connected on the two ejector rods 64, and a transmission gear 67 is engaged between the two lifting racks 66, the transmission gear 67 is rotationally connected with the lifting frame 1.

When the racket frame 53 is not used for serving, the positioning block 24 moves to enable the driven gear 20 to be meshed with the driving teeth 19, the transmission gear 60 can be connected with a transmission device through the output end of the driving motor 17 to drive the transmission gear, and the transmission gear 60 is disengaged from the pinion 60 at the moment;

when the pinion 60 rotates, the second worm, the cam 61 and the fifth belt wheel 62 also rotate along with the rotation, the second worm rotates to be meshed with the second worm wheel to play a role in locking, the fifth belt wheel 62 rotates to drive the sixth belt wheel 63 and the second rotating shaft 49 fixedly connected with the third belt wheel 63 to rotate through a third transmission belt, the cam 61 cooperates with the ejector rod 64 to enable the first baffle plate 58 to move downwards when rotating, the second spring 65 compresses, the first baffle plate 58 moves downwards and simultaneously conducts through the two lifting racks 66 and the conduction gear 67, the second baffle plate 59 moves upwards at the moment to completely block the rear tennis balls, the tennis balls between the first baffle plate 58 and the second baffle plate 59 slide down through the channel 57, when the ejector rod 64 is disengaged from the cam 61, the first baffle plate 58 resets upwards under the action of the second spring 65, the second baffle plate 59 resets downwards at the moment, and a ball enters between the first and

second stops

58, 59.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a tennis serving device, includes lift frame (1), its characterized in that: the ball shooting device is characterized in that an angle-adjustable launching tube (2) is rotatably connected to the lifting frame (1), a shell (3) is arranged above the launching tube (2), a ball storage device (4) is arranged above the shell (3), a ball inlet pipe (5) is fixedly communicated between the shell (3) and the launching tube (2), a ball outlet pipe (6) is fixedly communicated between the shell (3) and the ball storage device (4), a ball feeding turntable (7) is rotatably connected to the shell (3), a plurality of grooves (8) which are uniformly distributed in the circumference are formed in the edge of the ball feeding turntable (7), a shooting rod (9) which slides along the axial direction of the shooting rod is arranged inside the launching tube (2), an elastic head (10) is fixedly connected to the head end of the shooting rod (9), and a first spring (11) sleeved on the shooting rod (9) is arranged between the elastic head (10) and the launching tube (2), the ejection rod (9) is fixedly connected with an ejection rack (12) at the outer part of the ejection barrel (2), the ejection rack (12) is meshed with an incomplete gear (13), the incomplete gear (13) is coaxially and fixedly connected with a ratchet wheel (14), a first belt wheel (15) and a first regular polygon prism (16), the first regular polygon prism (16) is rotatably connected with the shell (3), the ratchet wheel (14) is provided with a pawl in a matching manner to form a ratchet wheel and pawl mechanism, the lifting frame (1) is fixedly provided with a driving motor (17), the output end of the driving motor (17) is fixedly connected with a driving shaft (18), the driving shaft (18) is provided with a plurality of driving teeth (19) which are uniformly distributed along the circumference, the front ends of the driving teeth (19) are flush, the length of the rear ends is sequentially increased, the first regular polygon prism (16) is provided with a driven gear (20) which can be adjusted in position along the axial direction, the driven gear (20) can be meshed with the driving gear (19) to rotate, a geneva wheel mechanism (21) is rotatably connected to the shell (3), the output end of the geneva wheel mechanism (21) is coaxially and fixedly connected with the ball feeding turntable (7), the input end of the geneva wheel mechanism (21) is coaxially and fixedly connected with a second belt wheel (22), and a first transmission belt is arranged between the first belt wheel (15) and the second belt wheel (22) in a matched manner;

a positioning plate (26) is fixedly connected to the launching tube (2), a first worm wheel (27) is fixedly connected to the positioning plate (26), and a first worm (28) which is rotatably connected with the shell (3) and can rotate in a reciprocating manner is meshed with the first worm wheel (27);

fixedly connected with first gear (29) on first worm (28), first gear (29) meshing has reciprocal rack (30), fixedly connected with L type pole (31) on reciprocal rack (30), fixedly connected with arc (32) on lift frame (1), coaxial rotation is connected with regulating plate (33) on arc (32), threaded connection has locking screw (34) that can fix a position with arc (32) on regulating plate (33), sliding connection has first slider (35) on regulating plate (33), sliding connection has guide block (36) on first slider (35), vertical sliding connection of vertical section of guide block (36) and L type pole (31), fixedly connected with locating lever (37) on first slider (35), fixedly connected with drive pin on locating lever (37), the center of arc (32) rotates and is connected with eccentric wheel (38), an eccentric groove (39) is formed in the eccentric wheel (38), and the driving pin is connected with the eccentric groove (39) in a sliding mode.

2. A tennis ball serving apparatus as defined in claim 1, wherein: it is connected with regulation lead screw (23) to rotate on lift frame (1), it has locating piece (24) to adjust screw (23) to go up screw-thread fit, it is connected with first pivot (25) to rotate on locating piece (24), first pivot (25) and driven gear (20) fixed connection, first pivot (25) and first regular polygon prism (16) sliding connection.

3. A tennis ball serving apparatus as defined in claim 1, wherein: the utility model discloses a lifting vehicle frame, including lifting vehicle frame (1), rotation center department fixedly connected with second gear (40) of eccentric wheel (38), it is connected with second polygon prism (41) to rotate on lifting vehicle frame (1), be equipped with third gear (42) that can follow its axial regulation on second polygon prism (41), rotate on third gear (42) and be connected with control lead screw (43) with lifting vehicle frame (1) horizontal sliding connection, screw-thread fit has adjusting nut (44) of being connected with lifting vehicle frame (1) rotation on control lead screw (43).

4. A tennis ball serving apparatus as defined in claim 3, wherein: the multi-angle lifting frame is characterized in that a first bevel gear (45) is fixedly connected to the second polygon prism (41), a second bevel gear (46) is meshed with the first bevel gear (45), a third belt wheel (47) rotatably connected with the lifting frame (1) is fixedly connected to the second bevel gear (46) in a coaxial mode, a fourth belt wheel (48) is fixedly connected to the output end of the driving motor (17), and the third belt wheel (47) and the fourth belt wheel (48) are connected and matched through a second transmission belt.

5. A tennis ball serving apparatus as defined in claim 1, wherein: a rotatable second rotating shaft (49) is arranged on the lifting frame (1), an adjusting rod (50) is fixedly connected onto the second rotating shaft (49), one end, far away from the second rotating shaft (49), of the adjusting rod (50) is rotatably connected with a roller (51), an inclined plane is arranged on the lifting frame (1), a second sliding block (52) capable of adjusting the position in a sliding manner is arranged along the inclined plane direction of the lifting frame (1), a racket frame (53) is hinged onto the second sliding block (52), a slide way (54) matched with the roller (51) is arranged on one side of the racket frame (53), an outlet (55) communicated with the groove (8) is arranged on the shell (3), a slope surface inclined towards the outlet (55) is arranged on the groove (8), a receiving port (56) which corresponds to the outlet (55) and is arranged in an inclined manner is arranged on the lifting frame (1), and a channel (57) of which the outlet end corresponds to the racket frame (53) is integrally connected onto the receiving port (56), the channel (57) is internally provided with a first baffle plate (58) and a second baffle plate (59) which can alternately vertically lift.

6. A tennis ball serving apparatus as defined in claim 5, wherein: a pinion (60) driven by a driving motor (17) is rotatably connected to the lifting frame (1), a second worm, a cam (61) and a fifth belt wheel (62) are coaxially and fixedly connected to the pinion (60), a second worm wheel rotatably connected to the lifting frame (1) is meshed with the second worm, a sixth belt wheel (63) is fixedly connected to a second rotating shaft (49), the fifth belt wheel (62) is connected with the sixth belt wheel (63) through a third transmission belt, ejector rods (64) vertically and slidably connected with the moving frame are fixedly connected to the lower ends of the first baffle plate (58) and the second baffle plate (59), one ejector rod (64) and the cam (61) correspond to form a mechanism for downward movement of the ejector rod, a second spring (65) capable of resetting the ejector rod (64) is sleeved on the ejector rod (64), and lifting racks (66) are fixedly connected to the two ejector rods (64), the middle of the two lifting racks (66) is meshed with a transmission gear (67), and the transmission gear (67) is rotationally connected with the lifting frame (1).