CN109173218B - Vertical double-wheel service system, system control method and CPU control method thereof - Google Patents
Vertical double-wheel service system, system control method and CPU control method thereof Download PDFInfo
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- CN109173218B CN109173218B CN201811010705.6A CN201811010705A CN109173218B CN 109173218 B CN109173218 B CN 109173218B CN 201811010705 A CN201811010705 A CN 201811010705A CN 109173218 B CN109173218 B CN 109173218B
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B69/00—Training appliances or apparatus for special sports
- A63B69/40—Stationarily-arranged devices for projecting balls or other bodies
- A63B69/406—Stationarily-arranged devices for projecting balls or other bodies with rotating discs, wheels or pulleys gripping and propelling the balls or bodies by friction
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- Physical Education & Sports Medicine (AREA)
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Abstract
A vertical double-wheel serve system, a system control method and a CPU control method thereof belong to the technical field of training instruments; the system comprises an equipment lock, a display module, a CPU control module, a ball supplementing detection module, a ball missing detection module, a ball serving module and a payment module, wherein the equipment lock is connected with the CPU control module through a wireless communication module; the method comprises the steps of setting the ball serving speed and the number on the display module, monitoring the number of balls in real time through the ball-supplementing detection module, wherein the number is insufficient, the payment cannot be completed, otherwise, the payment is completed, the equipment lock is opened, the ball-leaking detection module is used for monitoring whether the balls exist in the transmission hose or not in real time, the balls do not exist, the CPU control module controls the stirring unit to rotate, the ball-leaking action is completed until the balls are detected by the ball-leaking detection module, and the method is simple in operation, capable of automatically leaking the balls and reminding the supplement of the balls, and capable of saving.
Description
Technical Field
The invention belongs to the technical field of training instruments, and particularly relates to a vertical double-wheel ball serving system, a system control method and a CPU control method thereof.
Background
At present, a pitching machine is generally used for assisting athletes to practice, the entertainment function of the pitching machine is omitted, when non-professional athletes practice entertainment, if a professional pitching machine is used, the due entertainment effect cannot be obtained at all, and if the pitching machine is not suitable for practice, the participation of an accompanying person is needed, and the entertainment cost is increased, so that the invention of the pitching machine suitable for the non-professional athletes is very necessary; therefore, once the existing ball serving machine is directly used for training of non-professional athletes, the existing ball serving machine has the disadvantages of less ball discharge, complex operation, waste of manpower and material resources and great inconvenience for the non-professional athletes.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides a vertical double-wheel service system, a system control method and a CPU control method thereof.
The technical scheme of the invention is as follows:
a vertically-arranged two-wheel service system comprises a display module, a CPU control module, a ball supplementing detection module, a ball leakage detection module, a service module, a payment module, a wireless communication module, an equipment lock and a power supply module; the device lock is connected with the CPU control module through the wireless communication module, the CPU control module is respectively connected with the display module, the CPU control module, the ball supplementing detection module, the ball leakage detection module, the ball serving module and the payment module, and the power supply module supplies power for the display module, the CPU control module, the ball supplementing detection module, the ball leakage detection module, the ball serving module, the payment module, the wireless communication module and the device lock.
Further, the service module comprises a frame unit, a ball storage tank, a stirring unit, a transmission unit and a service unit; the top end of the frame unit is provided with a ball storage groove, a group of stirring units are arranged in the ball storage groove, a ball leakage port is processed at the lower end of the ball storage groove and is connected with the ball inlet end of the transmission unit, and the ball outlet end of the transmission unit is connected with the ball serving unit;
the transmission unit comprises a group of transmission pipelines;
the ball serving unit comprises a power device and an air cylinder pushing device, and the power device and the air cylinder pushing device are respectively arranged on two sides of the ball outlet end of the transmission unit.
Furthermore, the ball supplementing detection module is arranged in the ball storage groove, and the ball leakage detection module is arranged in the transmission pipeline.
Further, the payment module comprises a recharging card reader and a service card reader, the recharging card reader is used for recharging the RFID card, and the service card reader is used for paying and serving the RFID card.
Further, the display device also comprises a starting button and a button indicator light, wherein the starting button and the button indicator light are arranged close to the display module.
Further, the display module is a touch display screen.
Further, the device also comprises a foot switch.
A control method realized based on the vertical double-wheel service system comprises the following steps:
step a, switching on a power supply;
b, paying by a paying module, monitoring whether a ball exists in the ball storage groove within 20 cm in real time by a ball supplementing detection module, transmitting information to a CPU control module in real time, if the balls are not monitored by the ball supplementing detection module within 7 seconds continuously, stopping the paying function by the CPU control module, controlling an LED lamp to flicker, prompting that the balls are insufficient by a display module and the balls need to be supplemented, and otherwise transmitting information of completing the paying to the CPU control module;
c, the CPU control module controls the equipment lock to be unlocked, the control password is displayed on the display module, the control password is input for operation, and the service speed and the service number are set;
step d, starting by a pedal switch;
step e, the CPU control module controls double stirring motors in the stirring unit to work and rotate in the same direction, drives two stirring impellers to rotate in the same direction, drives the balls in the ball frame to rotate and enter a transmission hose in the transmission unit one by one, and the air cylinder pushing device pushes the balls between two friction wheels one by one and the rotating friction wheels launch the balls out;
and f, the ball leakage detection module monitors whether balls exist in the range of 10 cm in the transmission hose in real time and transmits information to the CPU control module in real time, and when no ball is detected, the CPU control module controls the stirring unit to rotate to complete ball leakage until the ball leakage detection module detects the ball.
A CPU control method realized based on the vertical double-wheel service system comprises the following steps:
step a, parameter configuration and program operation;
b, carrying out a payment program, stopping payment when receiving the ball empty signal, waiting for ball supplement, continuing the payment program when receiving the ball supplement signal, and finishing the payment program when not receiving the ball empty signal;
step c, receiving a payment completion signal, performing step d, and if not, performing step a;
step d, controlling the motor to start, and receiving a starting signal;
e, serving one ball, and resetting the motor;
and f, sending a delay signal, judging whether a group is sent or not, if so, finishing the program, and if not, executing the step e.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a vertically-arranged double-wheel service system, a system control method and a CPU control method thereof.
The invention is provided with the entering password, can prevent the misoperation of personnel, and can effectively and visually detect the debugging state of the pitching machine by controlling the ball speed regulation, one pitching and one pitching group.
Drawings
FIG. 1 is a system architecture diagram of the present invention;
FIG. 2 is a schematic structural diagram of a service module;
FIG. 3 is a schematic structural view of a ball storage groove;
fig. 4 is a schematic diagram of a transmission unit;
FIG. 5 is a schematic structural view of a ball serving unit;
FIG. 6 is a schematic illustration of the installation of the friction discs;
fig. 7 is a flowchart of a CPU control method.
In the figure: 1 display module, 2CPU control module, 3 ball supplementing detection module, 4 ball leaking detection module, 5 ball serving module, 5-1 frame unit, 5-1-1 movable roller, 5-1-2 movable handle, 5-1-3 ball serving machine framework, 5-1-4 ball serving machine skin, 5-2 ball storage groove, 5-2-1 ball storage frame, 5-2-2 ball storage transverse plate, 5-2-3 ball storage inclined plate, 5-2-4 ball leaking port, 5-3 stirring unit, 5-3-1 stirring fan blade, 5-3-2 stirring motor, 5-4 transmission unit, 5-4-1 transmission pipeline, 5-4-2 temporary storage shell, 5-5 ball serving unit, 5-5-1 power device, 5-5-2 cylinder pushing devices, 6 payment modules, 7 wireless communication modules, 8 equipment locks and 9 power modules.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Detailed description of the invention
A vertical double-wheel service system is shown in figure 1 and comprises a display module 1, a CPU control module 2, a ball supplement detection module 3, a ball leakage detection module 4, a service module 5, a payment module 6, a wireless communication module 7, an equipment lock 8 and a power supply module 9; the device lock 8 is connected with the CPU control module 2 through the wireless communication module 7, the CPU control module 2 is respectively connected with the display module 1, the CPU control module 2, the ball supplementing detection module 3, the ball leakage detection module 4, the ball serving module 5 and the payment module 6, and the power supply module 9 supplies power for the display module 1, the CPU control module 2, the ball supplementing detection module 3, the ball leakage detection module 4, the ball serving module 5, the payment module 6, the wireless communication module 7 and the device lock 8.
Specifically, as shown in fig. 2 to 6, the service module 5 includes a frame unit 5-1, a ball storage tank 5-2, a stirring unit 5-3, a transmission unit 5-4, and a service unit 5-5; a ball storage groove 5-2 is formed in the top end of the frame unit 5-1, a group of stirring units 5-3 is arranged in the ball storage groove 5-2, a ball leakage port 5-2-4 is formed in the lower end of the ball storage groove 5-2, the ball leakage port 5-2-4 is connected with a ball inlet end of a transmission unit 5-4, and a ball outlet end of the transmission unit 5-4 is connected with the ball serving unit 5-5;
the ball serving unit 5-5 comprises a power device 5-5-1 and an air cylinder pushing device 5-5-2, and the power device 5-5-1 and the air cylinder pushing device 5-5-2 are respectively arranged on two sides of the ball outlet end of the transmission unit 5-4.
Specifically, the lower end of the frame unit 5-1 is provided with two movable rollers 5-1-1, and the upper end of the frame unit 5-1 is provided with a group of movable handles 5-1-2.
The handles and the bottom rollers are added, so that the carrying and the moving are convenient;
specifically, the ball storage tank 5-2 comprises a group of ball storage frames 5-2-1, a ball storage transverse plate 5-2-2 is arranged at the lower end of the ball storage frame 5-2-1, the ball storage frame 5-2-1 and the ball storage transverse plate 5-2-2 are arranged inside the frame unit 5-1, one side of the ball storage transverse plate 5-2-2 is fixedly connected with a group of ball storage inclined plates 53, the ball leakage port 5-2-4 is processed on the ball storage transverse plate 5-2-2, and the stirring units 5-3 are arranged on two sides of the ball leakage port 5-2-4.
Specifically, the stirring unit 5-3 comprises two stirring motors 5-3-2, the stirring motors 5-3-2 are fixedly arranged below the ball storage transverse plate 5-2-2 through bolts, a main shaft of the stirring motor 5-3-2 penetrates through the ball storage transverse plate 5-2-2 to be detachably connected with a group of stirring blades 5-3-1, and the two stirring motors 5-3-2 are respectively arranged on two sides of the ball leakage port 5-2-4.
The bottom of the ball frame of the stirring unit has a certain inclination angle, so that balls can fully leak out from the ball leaking port 5-2-4;
two groups of stirring fan blades 5-3-1 are arranged on two sides of a ball leakage port 5-2-4 in the stirring unit 5-3, the traditional rotary table ball leakage mode is changed, the stable structure of a ball at the ball leakage port is changed through the impeller rotation mode, the ball falls smoothly, meanwhile, the ball is rotated to provide obliquely upward force, the problem of ball clamping is effectively solved, meanwhile, the radial friction force of the motor during rotation can be reduced, the motor loss is reduced, the service life of the motor is prolonged, and the motor efficiency is improved;
specifically, the conveying unit 5-4 comprises a group of conveying pipelines 5-4-1, the ball inlet end of the conveying pipeline 5-4-1 is communicated with the ball leakage port 5-2-4, the ball outlet end of the conveying pipeline 5-4-1 is communicated with a group of temporary storage shells 5-4-2, one end of each temporary storage shell 5-4-2 is provided with a ball outlet, the other end of each temporary storage shell 5-4-2 is connected with the cylinder pushing device 5-5-2, and the ball outlet of each temporary storage shell 5-4-2 is provided with the power device 5-5-1.
Specifically, the air cylinder pushing device 5-5-2 comprises a group of pushing air cylinders 5-5-2-1, the fixed ends of the pushing air cylinders 5-5-2-1 are fixedly arranged inside the frame unit 5-1, a group of ball pushing plates are arranged on the movable ends of the pushing air cylinders 5-5-2-1, grooves are machined in the ball pushing plates, and the movable ends of the pushing air cylinders 5-5-2-1 and the ball pushing plates are both arranged in the temporary storage shell 5-4-2.
Specifically, the power device 5-5-1 comprises two groups of friction wheel motors 5-5-1-1, a main shaft of the friction wheel motor 5-5-1-1 is fixedly connected with a group of friction wheel discs 5-5-1-3 through a tensioning sleeve 5-5-1-2, a decorative cover 5-5-1-4 is arranged at the outer end of the tensioning sleeve 5-5-1-2, and the two friction wheel discs 5-5-1-3 are respectively arranged above and below a ball outlet of the temporary storage shell 5-4-2;
abandon keyway formula connected mode in the past on the fixed mode of friction pulley, adopt the tight cover of expanding to connect, centering precision is high, and the installation is dismantled conveniently, intensity is high and the connection is reliable and stable.
The speed and the angle of the friction wheel are adjustable, so that the friction wheel can adapt to different fields;
the vertically arranged friction wheel motor 5-5-1-1 is adopted, so that the pitching stability can be improved, and the damage to a batter caused by the deviation of the baseball to the left and right sides can be prevented;
specifically, the outer end of each friction wheel disc 5-5-1-3 is provided with a friction rubber sleeve.
Specifically, the frame unit 5-1 comprises a pitching machine framework 5-1-3 and a pitching machine skin 5-1-4, the stirring unit 5-3, the transmission unit 5-4 and the pitching unit 5-5 are all arranged inside the pitching machine framework 5-1-3, the pitching machine skin 5-1-4 is wrapped at the outer end of the pitching machine framework 5-1-3, and a pitching ball outlet 5-1-4-1 is processed at the position of the pitching machine framework 5-1-4 corresponding to the pitching unit 5-5; the overall parcel protection of exterior structure increase can prevent the pasture and dust, and lets friction pulley rotation part separate with the user, avoids personnel's mistake to touch the friction pulley and produces the personal safety problem.
Firstly, after the equipment is powered on, the double stirring motors in the stirring module work to rotate in the same direction to drive the two stirring impellers to rotate, so that balls in the ball frame are driven to rotate and enter a transmission hose in the transmission module one by one, the air cylinder pushing device pushes the balls one by one between the two friction wheels, and the rotating friction wheels launch the balls.
Specifically, the ball supplement detection module 3 is arranged in the ball storage groove 5-2, and the ball leakage detection module 4 is arranged in the transmission pipeline 5-4-1.
The additional ball supplement detection module 3 can inform a user of ball supplement in time, and ball leakage infrared detection can effectively control the stirring impeller to be started and stopped, so that electric energy is saved;
specifically, the payment module 6 includes a recharging card reader and a service card reader, the recharging card reader is used for recharging the RFID card, and the service card reader is used for paying service using the RFID card.
Specifically, the display device further comprises a starting button and a button indicator light, wherein the starting button and the button indicator light are arranged close to the display module 1 and are connected with the CPU control module 2 through a wireless communication module 7.
Specifically, the display module 1 is a touch display screen.
Specifically, the device also comprises a foot switch which is connected with the CPU control module 2 through a wireless communication module 7.
Detailed description of the invention
A control method realized based on the vertical double-wheel service system comprises the following steps:
step a, switching on a power supply;
b, paying by a paying module 6, monitoring whether a ball exists in a ball storage groove 5-2 within a range of 20 cm in real time by a ball supplementing detection module 3, transmitting information to a CPU control module 2 in real time, if the ball is not monitored by the ball supplementing detection module 3 within 7 seconds continuously, stopping the paying function by the CPU control module 2, controlling an LED lamp to flicker, prompting that the ball is insufficient by a display module, needing to supplement the ball, playing a ball supplementing animation, and otherwise, transmitting information of completing paying to the CPU control module 2;
step c, the CPU control module 2 controls the equipment lock 8 to be unlocked, the control password is displayed on the display module 1, the control password is input for operation, and the service speed and the service number are set;
step d, starting by a pedal switch;
step e, the CPU control module 2 controls the double stirring motors in the stirring unit 5-3 to work and rotate in the same direction to drive the two stirring impellers to rotate in the same direction to drive the balls in the ball frame to rotate and enter the transmission hose 5-4-1 in the transmission unit 5-4 one by one, the air cylinder pushing device 5-6-2 pushes the balls between the two friction wheels one by one, and the rotating friction wheels launch the balls out;
and f, the ball leakage detection module 4 monitors whether balls exist in the range of 10 cm in the transmission hose 5-4-1 in real time, information is transmitted to the CPU control module 2 in real time, and when no ball is detected, the CPU control module 2 controls the stirring unit 5-3 to rotate to complete ball leakage until the ball leakage detection module 4 detects the ball.
Detailed description of the invention
A CPU control method realized based on the vertical double-wheel service system comprises the following steps:
step a, parameter configuration and program operation;
b, carrying out a payment program, stopping payment when receiving the ball empty signal, waiting for ball supplement, continuing the payment program when receiving the ball supplement signal, and finishing the payment program when not receiving the ball empty signal;
step c, receiving a payment completion signal, performing step d, and if not, performing step a;
step d, controlling the motor to start, and receiving a starting signal;
e, serving one ball, and resetting the motor;
and f, sending a delay signal, judging whether a group is sent or not, if so, finishing the program, and if not, executing the step e.
The above embodiments are merely illustrative of the present patent and do not limit the scope of the patent, and those skilled in the art can make modifications to the parts thereof without departing from the spirit and scope of the patent.
Claims (9)
1. A vertically-arranged two-wheel service system is characterized by comprising a display module (1), a CPU control module (2), a service ball detection module (3), a ball leakage detection module (4), a service ball module (5), a payment module (6), a wireless communication module (7), an equipment lock (8) and a power supply module (9); the device lock (8) is connected with the CPU control module (2) through the wireless communication module (7), the CPU control module (2) is respectively connected with the display module (1), the ball supplementing detection module (3), the ball leakage detection module (4), the ball serving module (5) and the payment module (6), and the power supply module (9) supplies power for the display module (1), the CPU control module (2), the ball supplementing detection module (3), the ball leakage detection module (4), the ball serving module (5), the payment module (6), the wireless communication module (7) and the device lock (8).
2. The vertical double-wheel service system according to claim 1, wherein the service module (5) comprises a frame unit (5-1), a ball storage tank (5-2), a stirring unit (5-3), a transmission unit (5-4) and a service unit (5-5); a ball storage groove (5-2) is formed in the top end of the frame unit (5-1), a group of stirring units (5-3) is arranged in the ball storage groove (5-2), a ball leakage port (5-2-4) is machined in the lower end of the ball storage groove (5-2), the ball leakage port (5-2-4) is connected with the ball inlet end of the transmission unit (5-4), and the ball outlet end of the transmission unit (5-4) is connected with the ball serving unit (5-5);
the transmission unit (5-4) comprises a group of transmission pipelines (5-4-1);
the ball serving unit (5-5) comprises a power device (5-5-1) and an air cylinder pushing device (5-5-2), and the power device (5-5-1) and the air cylinder pushing device (5-5-2) are respectively arranged on two sides of the ball outlet end of the transmission unit (5-4).
3. The vertical double-wheel service system as claimed in claim 2, wherein the ball supplement detection module (3) is arranged in a ball storage tank (5-2), and the ball leakage detection module (4) is arranged in a transmission pipeline (5-4-1).
4. The vertical double-round service system according to claim 3, wherein the payment module (6) comprises a card reader for recharging the RFID card and a card reader for service, the card reader for recharging the RFID card and the card reader for service is used for paying for service by using the RFID card.
5. The vertical double-wheel service system as claimed in claim 4, further comprising a start button and a button indicator light, wherein the start button and the button indicator light are arranged close to the display module (1) and are connected with the CPU control module (2) through the wireless communication module (7).
6. A vertical two-wheeled ball serving system according to claim 5, wherein the display module (1) is a touch screen display.
7. The vertical double-wheel service system as claimed in claim 6, further comprising a foot switch connected to the CPU control module (2) through the wireless communication module (7).
8. A control method implemented on the basis of the double-wheel service system of any one of claims 1 to 7, characterized by comprising the following steps:
step a, switching on a power supply;
b, paying through a paying module (6), monitoring whether a ball exists in a ball storage groove (5-2) within a range of 20 cm in real time by a ball supplementing detection module (3), transmitting information to a CPU control module (2) in real time, if the ball supplementing detection module (3) does not monitor the ball within 7 seconds continuously, stopping the paying function by the CPU control module (2), controlling an LED lamp to flicker, prompting that the ball is insufficient by a display module (1), needing ball supplementing, and otherwise transmitting payment completion information to the CPU control module (2);
c, the CPU control module (2) controls the equipment lock (8) to be unlocked, the control password is displayed on the display module (1), the control password is input for operation, and the service speed and the service number are set;
step d, starting by a pedal switch;
step e, the CPU control module (2) controls double stirring motors in the stirring unit (5-3) to work and rotate in the same direction, drives two stirring impellers to rotate in the same direction, drives the balls in the ball frame to rotate and enter a transmission pipeline (5-4-1) in the transmission unit (5-4) one by one, and the air cylinder pushing device (5-5-2) pushes the balls one by one between two friction wheels and launches the balls by the rotating friction wheels;
and f, the ball leakage detection module (4) monitors whether balls exist in the transmission pipeline (5-4-1) within the range of 10 cm in real time, information is transmitted to the CPU control module (2) in real time, and when no ball is detected, the CPU control module (2) controls the stirring unit (5-3) to rotate to complete ball leakage until the ball leakage detection module (4) detects the ball.
9. A CPU control method implemented based on the two-wheel service system of any one of claims 1 to 7, characterized by comprising the steps of:
step a, parameter configuration and program operation;
b, carrying out a payment program, stopping payment when receiving the ball empty signal, waiting for ball supplement, continuing the payment program when receiving the ball supplement signal, and finishing the payment program when not receiving the ball empty signal;
step c, receiving a payment completion signal, performing step d, and if not, performing step a;
step d, controlling the motor to start, and receiving a starting signal;
e, serving one ball, and resetting the motor;
and f, sending a delay signal, judging whether a group is sent or not, if so, finishing the program, and if not, executing the step e.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811010705.6A CN109173218B (en) | 2018-08-31 | 2018-08-31 | Vertical double-wheel service system, system control method and CPU control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811010705.6A CN109173218B (en) | 2018-08-31 | 2018-08-31 | Vertical double-wheel service system, system control method and CPU control method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN109173218A CN109173218A (en) | 2019-01-11 |
| CN109173218B true CN109173218B (en) | 2020-06-30 |
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| CN201811010705.6A Active CN109173218B (en) | 2018-08-31 | 2018-08-31 | Vertical double-wheel service system, system control method and CPU control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110013659A (en) * | 2019-03-21 | 2019-07-16 | 广东农工商职业技术学院 | Multipurpose rod ball robot and its control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5195744A (en) * | 1991-11-13 | 1993-03-23 | Video Baseball, Inc. | Baseball batting practice apparatus with control means |
| CN2595418Y (en) * | 2002-11-15 | 2003-12-31 | 罗晓林 | Ball throwing machine for tennis ball |
| US7691012B2 (en) * | 2003-11-03 | 2010-04-06 | Precision Sports Robotics, Llc | Programmable ball throwing apparatus |
| CN202438116U (en) * | 2012-01-20 | 2012-09-19 | 王立学 | Tennis ball pitching machine |
-
2018
- 2018-08-31 CN CN201811010705.6A patent/CN109173218B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5195744A (en) * | 1991-11-13 | 1993-03-23 | Video Baseball, Inc. | Baseball batting practice apparatus with control means |
| CN2595418Y (en) * | 2002-11-15 | 2003-12-31 | 罗晓林 | Ball throwing machine for tennis ball |
| US7691012B2 (en) * | 2003-11-03 | 2010-04-06 | Precision Sports Robotics, Llc | Programmable ball throwing apparatus |
| CN202438116U (en) * | 2012-01-20 | 2012-09-19 | 王立学 | Tennis ball pitching machine |
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| CN109173218A (en) | 2019-01-11 |
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