CN103585748A - Tennis training machine - Google Patents

Abstract

The invention relates to a tennis training machine and a training method of the training machine. The device cooperates with a ball picking system, a steering system, a ball hitting system and a ball collecting system, wherein the steering system includes an irregular cam rotating shaft, and the ball hitting system Including incomplete gears, the ball collecting system includes a dribbling device, the irregular cam rotation shaft is connected with the motor main shaft, the incomplete gear is connected with the motor main shaft through a belt, and the ball dribbling device is connected with the motor main shaft. The structure is simple, so that the launch tube can rotate irregularly and randomly, ensuring the frequency and speed of tennis balls being thrown. When the device is pushed, the tennis balls on the ground can be collected automatically. It has strong training simulation and makes the training effect better.

Description

A tennis training machine

technical field

The invention relates to a tennis training machine and a training method of the training machine. Through the mutual cooperation of a ball picking system, a steering system, a ball hitting system and a ball collecting system, the device can complete the actions of throwing and picking up the ball and realize simulation.

Background technique

Tennis, which originated in France, has now become one of the most popular ball games in the world and is deeply loved by outdoor sports people. Tennis is developing rapidly and is very popular among students. Many physical education departments in colleges and universities have opened tennis majors, and it has also become one of the elective courses in public sports. Tennis majors and public physical education students generally need at least one sparring partner during training. Often due to the lack of sparring staff, or the instability of the sparring partner's service strength, angle, distance, and ball rotation, the training effect is insufficient. good. In order to solve these two problems, an economical and practical ball server is designed, so that more students and tennis fans can practice multi-ball more comfortably and effectively.

But in fact, as a confrontational sport, when you only have one person, maybe you can only do nothing, and our idea of this tennis training machine was created to deal with this situation.

Contents of the invention

The object of the present invention is to provide a tennis training machine. This device can realize the random change of throwing ball angle, has high training simulation, and promotes the device to realize the collection of tennis balls on the field. After collection, it can also automatically Send it to the upper ball box for training, specifically:

A tennis training machine includes a ball picking system, a steering system, a ball hitting system and a ball collecting system, the steering system includes an irregular cam rotation shaft, the ball hitting system includes incomplete gears, and the ball collecting system includes a ball dribbling device. The irregular cam rotating shaft is connected with the main shaft of the motor, the incomplete gear is connected with the main shaft of the motor through a belt, and the dribbling device is connected with the main shaft of the motor.

The ball picking system also includes a wheel, a wheel shaft connected to the center of the wheel, the wheel shaft is connected to the curved three-blade wheel through a connecting rod and a rotating shaft connected to the connecting rod, the center of the wheel is arranged on the slope platform, and the training There is a ball picking system at the front and back of the machine.

The steering system also includes a roller push rod, one side of the roller push rod is connected with the slider, and the other side is connected with the irregular cam, the slider is arranged in the channel, and the other end of the slider is fixed on the On the rubber pipe, a launch tube is arranged on the top of the rubber pipe, and the launch tube and the slider are connected by a space spherical hinge, and the rubber pipe is made of elastic rubber material.

The ball hitting system is powered by a battery, and the incomplete gear is composed of a toothed part and a toothless part, and the toothed part and the toothless part are symmetrically distributed on the circumference. The ball hitting system also includes a spring device, the spring device is arranged in the channel, one side of the spring is connected with the movable collision head, and the other side is connected with the fixed baffle plate, a straight rack is arranged under the channel, The collision head is connected with a spur rack protruding from the lower part of the channel. The teeth on the spur rack mesh with the teeth on the incomplete gear, and the collision head is made of elastic rubber material.

The ball collection system also includes a bucket-shaped ball collection device and a chassis, the diameter of the outlet of the bucket-shaped ball collection device is 5-8mm larger than the diameter of tennis balls, the ball-dribbling device can rotate around the shaft, and the ball-dribbling device Three spoon-shaped ball-holding devices are evenly distributed, and the spoon-shaped ball-holding devices are fixed on the ball-dribbling device through connecting rods.

Another object of the present invention is to provide a training method for a tennis training machine, comprising the following steps:

1) Hitting: When training, turn on the switch to rotate the main shaft of the motor, and drive the incomplete gear to rotate through the belt. When the toothed part rotates to the upper part, it meshes with the spur rack at the lower part of the channel, and the spring is compressed to the right. The tennis ball falls from the storage box into the tunnel. After turning another angle, the part without teeth turns to the upper part, and the spring does not receive pressure, and the deformation will resume. At this time, the collision head hits the tennis ball at a high speed and knocks it out. The tennis ball enters the launching tube along the channel.

2) Steering: The lower part of the launching tube is hingedly connected to the shell of the device, and the right end is connected by an elastic rubber pipe, which can realize all-round swing up, down, left, and right. When the cam with irregular contour rotates, it drives the roller push rod and the slider to move irregularly, and the slider drives the launch tube to swing irregularly through the space spherical pair and the connecting rod, so that the tennis ball is thrown irregularly when passing through the launch tube, achieving better simulation training.

3) Picking up balls: When the pushing device moves, the wheels roll to drive the wheel shaft to rotate, and the crank and rocker behind the tennis training machine device drives the three-page ball picking up device to rotate, and the tennis balls on the ground are collected into the chassis of the device. Since the ball picking mechanism is arranged at the front and rear of the device, the ball picking can be realized regardless of whether the device is moving forward or backward.

4) Ball collection: The bottom of the collection box on the chassis of the device is lower, so that the tennis balls are all concentrated in the lower part. When the turntable in the middle is turned, the scoop-shaped ball holder on the edge scoops up the balls when they reach the bottom, and when turned to the upper part, the balls fall from the structure. Since the bucket-shaped ball collection device on the upper part of the device has a special-shaped opening, it can ensure that the tennis balls fall smoothly into the ball collection bucket.

Using the above-mentioned tennis training machine and method training method has the following excellent effects:

1. The cam roller push rod structure with irregular contour is used to drive the launch tube to rotate. The structure is simple, so that the launch tube can rotate irregularly and randomly.

2. Using the incomplete gear and rack structure, the spring energy storage with a large stiffness coefficient ensures the frequency and speed of the tennis ball being thrown.

3. The three-page ball pick-up device is adopted, no other external force is required, and the tennis balls on the ground can be collected automatically when the device is pushed, which is more convenient to use and saves energy.

4. The tennis ball can be automatically transported from the bottom to the bottom, which is easier and more convenient to use.

5. The multi-angle change of the launch tube can adjust the angle and height of the tennis ball, which has strong training simulation and makes the training effect better. the

This product has strong pertinence, great demand and good application effect. In addition, the overall design of this product is relatively ingenious, and it can be used outdoors. It is more convenient and easy to use, and the workload of people is relatively small. However, there are relatively few similar products on the market at present, so the application prospect of this product is relatively broad.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the tennis training machine.

Figure 2 is a schematic structural diagram of the ball picking system.

Figure 3 is a schematic diagram of the structure of the steering system.

Fig. 4 is a structural schematic diagram of the hitting system.

Fig. 5 is a schematic structural diagram of the ball collecting system.

Fig. 6 is a structural schematic diagram of a bucket-shaped ball collecting device.

Fig. 7 is the position of the court and the tennis training machine on the court.

Detailed ways

Example 1

A tennis training machine, comprising a ball picking system 1, a steering system 2, a ball hitting system 3 and a ball collecting system 4, the steering system 2 includes an irregular cam rotating shaft 11, the ball hitting system includes an incomplete gear 19, and the ball collecting system includes Ball-dribbling device 24, described irregular cam rotating shaft 11 links to each other with motor main shaft, incomplete gear 19 links to each other with motor main shaft by belt, and ball-dribbling device 24 links to each other with motor main shaft.

The described ball picking system 1 also includes a wheel 5, a wheel shaft 6 connected to the center of the wheel 5, the wheel shaft 6 is connected with a curved three-blade wheel 9 through a connecting rod 7 and a rotating shaft 8 connected to the connecting rod 7, and the center of the wheel 5 It is arranged on the slope platform 10, and a ball picking system 1 is respectively arranged at the front and back of the training machine.

The steering system 2 also includes a roller push rod 12, one side of the roller push rod 12 is connected with the slider 13, and the other side is connected with the irregular cam 11, and the slider 13 is arranged in the channel 14-1 , the other end of the slider 13 is fixed on the rubber pipe 16 via the spring 15, the rubber pipe 16 top is provided with a launch tube 17, and the launch tube 17 and the slide block 13 are connected by a space spherical hinge 18.

The ball hitting system 3 is powered by a storage battery, and the incomplete gear 19 is composed of a toothed part and a toothless part, and the toothed part and the toothless part are symmetrically distributed on the circumference.

The ball hitting system 3 also includes a spring device 20, the spring device 20 is arranged in the channel 14-2, one side of the spring device 20 is connected with the movable collision head 21, and the other side is connected with the fixed baffle plate 22 Connected, a spur rack 23 is arranged below the passage 14-2, and the collision head 21 is connected with the spur rack 23 protruding from the bottom of the passage 14-2.

The teeth on the spur rack 23 are shown meshing with the teeth on the partial gear 19 .

The shown rubber pipe 16 and collision head 21 are elastic rubber materials.

The ball collection system 4 also includes a bucket-shaped ball collection device 25 and a chassis 26, the diameter of the outlet of the bucket-shaped ball collection device 25 is 5-8mm larger than the diameter of tennis balls, and the described ball-dribbling device 24 can rotate around the shaft, And three spoon-shaped ball-holding devices 27 are evenly distributed on the ball-dribbling device 24 , and the spoon-shaped ball-holding devices 27 are fixed on the ball-dribbling device 24 by connecting rods 28 .

The tennis net used in practice is 1070mm high at both ends and 914mm high at the center. In order to facilitate the use and ensure the use effect, the overall size of the setting device is 600*550*1000mm. The diameter of the tennis ball is 65mm. In order to ensure the smooth movement of the tennis ball in the passage, we set the diameter of the passage to 70mm.

The incomplete gear meshes with the rack, the modulus of the teeth is m = 10mm, the diameter of the index circle is d = 300mm, and 6 teeth are set on one side. It is more appropriate to hit the ball every 3s during training, so set the cycle of the hitting system as T=3S, the frequency of the motor shaft and hitting the ball is the same, and set the motor speed as n=20r/min.

Kinematic analysis and calculation of spring coefficients:

Stats needed to pass a tennis ball through the net

The weight of a tennis ball is about 0.06kg. The size of a standard tennis court is 22.77m (length) x 8.23m (width). The distance from the center of the tennis net to the ground is 0.914m. The height reached by the tennis ball after being thrown is about 1.25m.

Serving position and ball speed determination

Horizontal direction: L=Vx*t;

Vertical direction: H=1.25-0.5*g*t^2;

H=0 then t=0.505s;

Time for the ball to reach the height of the net

H=0.914 then t=0.262s.

This tennis training machine is equipped with a left and right swing mechanism, so the mechanism should be located at the center line of the court when serving, as shown in Figure 7, where A is the court and B is the tennis training machine.

(1) Distance from the tennis training machine to the net:

The general speed of tennis ball is 20~25m/s, now the serving speed is 20m/s;

Conditions for a tennis ball to pass through the net without exceeding the scope of the tennis court:

When the tennis ball swings from side to side to the maximum angle to pass the net, other places can also be successful;

So calculate the data when the tennis ball swings to the maximum angle and just passes the net and does not exceed the range of the tennis court;

L=1/1.93*0.505*20=5.23;

Therefore, the distance from the serving machine to the net is determined to be 5.23m.

(2) Calculate the maximum ball speed:

V= (L+22.77/2) / 0.505=32.2m/s.

Calculation of Elasticity Coefficient

It is known that the mass of the tennis ball is m=0.06kg, and the speed when it is hit is v =32.2m/s, then the minimum kinetic energy to be provided is E=1/2*m*v^2=31.1J.

When the incomplete gear rotates through 6 teeth, the compressed length of the spring is about l=6/30*3.14*d=188.2mm. If the elastic coefficient is k, then there is 1/2*k*l^2=E=31.1 J, calculated to be about k=1760N/M.

Claims (10)

1. A tennis training machine, comprising a ball picking system (1), a steering system (2), a hitting system (3) and a ball collecting system (4), characterized in that the steering system (2) includes an irregular cam rotation Shaft (11), the batting system includes incomplete gears (19), the ball collection system includes a dribbling device (24), the irregular cam rotation shaft (11) is connected with the main shaft of the motor, and the incomplete gears (19) pass through Belt links to each other with motor main shaft, and dribbling device (24) links to each other with motor main shaft. 2. The tennis training machine according to claim 1, characterized in that, the ball picking system (1) also includes a wheel (5), a wheel shaft (6) connected to the center of the wheel (5), and the wheel shaft (6) The connecting rod (7) and the rotating shaft (8) connected with the connecting rod (7) are connected with the curved three-blade wheel (9). The center of the wheel (5) is set on the slope platform (10). The training A ball pick-up system (1) is respectively arranged at the front and back of the machine. 3. The tennis training machine according to claim 1, characterized in that, the steering system (2) further includes a roller push rod (12), and one side of the roller push rod (12) is connected with the slider (13) is connected, the other side is connected with the irregular cam (11), the slider (13) is set in the channel (14-1), and the other end of the slider (13) is fixed on the rubber pipe (16) via the spring (15). ), a launching tube (17) is arranged on the top of the rubber pipe (16), and the launching tube (17) and the slider (13) are connected by a space spherical hinge (18). 4. The tennis training machine according to claim 1, characterized in that the hitting system (3) is powered by a battery, and the incomplete gear (19) consists of a toothed part and a toothless part, so The toothed part and the non-toothed part are symmetrically distributed on the circumference. 5. The tennis training machine according to claim 1, characterized in that, the hitting system (3) further comprises a spring device (20), and the spring device (20) is arranged in the channel (14-2) In, one side of the spring device (20) is connected with the movable collision head (21), and the other side is connected with the fixed baffle (22). Head (21) links to each other with the spur tooth bar (23) that stretches out channel (14-2) bottom. 6. The tennis training machine according to claim 5, characterized in that the teeth on the straight rack (23) mesh with the teeth on the incomplete gear (19). 7. The tennis training machine according to claim 3 or 5, characterized in that the rubber pipe (16) and the collision head (21) are elastic rubber materials. 8. The tennis training machine according to claim 1, characterized in that, the ball collection system (4) further includes a bucket-shaped ball collection device (25) and a chassis (26), and the bucket-shaped ball collection device (25) The diameter of the outlet is 5-8mm larger than the diameter of the tennis ball. The ball dribbling device (24) can rotate around the axis, and three spoon-shaped ball holding devices (27) are evenly distributed on the ball dribbling device (24). Shape ball holding device (27) is fixed on the dribbling device (24) by connecting rod (28). 9. A training method for a tennis training machine, comprising the following steps: 1) Turn on the switch, the main shaft of the motor rotates, and the incomplete gear is driven by the belt to rotate. When the toothed part rotates to mesh with the spur rack at the lower part of the channel, the spring is compressed to the right, and the tennis ball falls from the storage box into the channel , when another angle is turned, the part without teeth turns to the upper part, the spring is not under pressure, and the deformation is restored, the collision head hits the tennis ball at high speed, and hits the ball out, and the tennis ball enters the launch tube along the channel; 2) When the rotation of the motor shaft drives the irregular cam to rotate, it also drives the roller push rod and the slider to move irregularly. The slider drives the launch tube to swing irregularly through the space spherical hinge connecting rod, and the tennis ball is thrown out irregularly when passing the launch tube. ; 3) When the pushing device moves, the wheels roll to drive the wheel shaft to rotate, and through the crank rocker structure, the three-page ball picking device is driven to rotate, and the tennis balls on the ground are collected into the collection box at the bottom of the device, and the training machine moves forward or backward Can pick up the ball; 4) When tennis balls are collected into the chassis of the training machine, when the turntable of the ball dribbling device rotates, the scoop-shaped ball-holding device on its edge will scoop up the ball when it reaches the bottom. It falls in the center and is sent to the bucket-shaped ball collecting device. 10. The training method of the tennis training machine according to claim 1, characterized in that, the motor speed is 20-30r/min.

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