CN105388064A - Device and method for measuring static rigidity of tennis racket string - Google Patents
Device and method for measuring static rigidity of tennis racket string Download PDFInfo
- Publication number
- CN105388064A CN105388064A CN201510716580.9A CN201510716580A CN105388064A CN 105388064 A CN105388064 A CN 105388064A CN 201510716580 A CN201510716580 A CN 201510716580A CN 105388064 A CN105388064 A CN 105388064A
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- tennis
- string
- patted
- clamping
- static rigidity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N2033/0078—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00 testing material properties on manufactured objects
- G01N2033/008—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00 testing material properties on manufactured objects sport articles (balls, skis, rackets)
Abstract
The invention discloses a device and method for measuring the static rigidity of a tennis racket string. The device comprises a stepping motor, a lifter, a coupler, a pressure sensor, a cross-shaped fastener, a tennis racket clamping device, a laser displacement sensor, a pressing rod and X-Y linear guide rails. The stepping motor and the lifter are connected through the coupler, the lifter is installed at the bottom of a frame through a lifter installation plate, the top of a screw rod of the lifter is connected with the pressure sensor, the pressure senor is located below the cross-shaped fastener, the cross-shaped fastener is clamped to the string vertically, the aluminum profile pressing rod presses the tennis racket clamping device to the top of the aluminum profile frame, the linear guide rails in the X-axis direction are fixed to the aluminum profile pressing rod, the linear guide rail in the Y-axis direction is connected to sliding blocks of the linear guide rails in the X-axis direction through a guide rail connecting plate, the laser displacement sensor is connected with a sliding block of the linear guide rail in the Y-axis direction, and thus the laser displacement sensor can freely move along the plane. The device and method for measuring the static rigidity of the tennis racket string have the advantages that control is simple and reliable, and cost is low.
Description
Technical field
The present invention relates to a kind of measurement mechanism, being specifically related to a kind of device and method patting string static rigidity for measuring tennis.
Background technology
Tennis is the motion of a grace and fierceness, has very strong competitiveness and sight, and dark liking by the masses, is one of most popular sports events in the world today, is called as second-biggest-in-the-world ball game.
In China, tennis becomes popular, become the sports events of the whole society, start to be paid close attention to by more people, a lot of school has all built up tennis court, and as the required course of sports curriculum, also inject capital into and set up Tennis Center in a lot of city, tennis is listed in nationwide fitness programs project, these excite the enthusiasm that our people actively joins in tennis all greatly, facilitate the development of China's tennis.
In addition, tennis equally has dual character with other motions, and it can ensure that sporter's is healthy, but moves and improperly also can produce athletic injury.Typical tennis injury has spraining and muscle, ligament injury of wrist joint, elbow joint, shoulder joint, waist joint, knee joint and ankle-joint, these athletic injurys are main relevant with the overload vibratory impulse power suffered by muscle group, especially more easily occur when technical movements are lack of standardization or too have an effect.
The rigidity of racket string is element the most basic in tennis.The difference of clapping string rigidity will directly affect the size of acting force in tennis and racket knockout process, and then affects the technical movements of sportsman's square stance.The rigidity that different materials has is different, the standardization of suitable rigidity to sportsman's action has important effect, suitable rigidity can ensure that sportsman's shot is more reasonable, sportsman can be made again to hold the dynamics of square stance exactly, thus minimizing athletic injury, improve competitiveness, the research therefore for the static rigidity of racket string seems particularly important.
Design a set of measurement mechanism, tennis racket string static rigidity is measured and experimental study, disclose the Changing Pattern of power in tennis and racket knockout process, sportsman is helped to select oneself bat string rigidity applicable, make athletic performance more reasonable, avoid coming to harm, become technical matters urgently to be resolved hurrily.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of tennis and pats string static rigidity measurement mechanism and method, can measure the deflection of tennis racket when specifying stressed size, thus can calculate the rigidity value of tennis face.
Technical scheme: for solving the problems of the technologies described above, string static rigidity measurement mechanism patted by tennis provided by the invention, comprise clamping part described in rack-mounted power section, clamping part and sensor detecting portion for the tested tennis racket of clamping, described power section is used for applying pressure to tennis face, described sensor detecting portion is for measuring the deflection of tennis face, described power section is arranged on the side of clamping part, and described sensor detecting portion is arranged on the opposite side of clamping part.
As preferably, described power section comprises the spider, pressure transducer, lifter and the motor that connect successively, and described spider pats string for clamping tennis.Thus can control accurately to be applied to the pressure that string patted by tennis.Driving lifter input shaft to rotate by shaft coupling after stepper motor is driven by PLC control and drive system makes the output screw of lifter vertically rise, the output screw top of lifter is by a pressure transducer connector coupling pressure sensor, the sensitive part of pressure transducer is against the lower surface of spider, spider is locked on the right-angled intersection point of tennis racket string, adopt this mounting means can Real-time Collection lifter to the pressure of tennis face.
As preferably, described sensor detecting portion comprises displacement mechanism and laser displacement sensor, and described laser displacement sensor is for measuring the displacement of spider upper surface, and institute's displacement mechanism moves on tennis face for driving laser displacement sensor.Such laser displacement sensor can in plane movement arbitrarily, and laser displacement sensor carrys out the deflection in survey grid racket face by the laser that the upper surface getting to spider reflects back.
As preferably, described motor is stepper motor, and described clamping part has two pieces for clamping the clamping plate of tennis racket, and the position that on described clamping plate, string patted by corresponding tennis offers through hole.
As preferably, institute's displacement mechanism is X-Y line slideway, comprise X-direction line slideway, X-direction slide block, Y direction line slideway and Y direction slide block, described X-direction line slideway is fixed in frame, described Y direction line slideway is connected on described X-direction slide block by guide rail splice, and described laser displacement sensor connects with described Y direction slide block.Adopt this mounting means laser displacement sensor can be moved to any point to go to measure the deflection of tennis racket.
As preferably, described frame is aluminum section bar frame.
As preferably, described clamp device is fitted in frame top by depression bar, and described depression bar is arranged in frame by securing member.Like this when aluminium section bar depression bar unclamps, tennis racket clamp device can in frame roof movement arbitrarily, and the lifter be convenient to below applies pressure to the arbitrfary point that string patted by tennis.Clamp device comprises about two pieces clamping plates, two padded aluminium section bars, two aluminium section bar depression bars, four tie down screws, four threaded blocks, tennis racket is sandwiched between two pieces of clamping plates, padded aluminium section bar by thread connection on lower clamping plate, clamp device is pressed on aluminum section bar frame by two aluminium section bar depression bar modes be pressed on padded aluminium section bar, aluminium section bar depression bar punching two ends, four tie down screws are screwed in threaded block through the hole at aluminium section bar depression bar two ends and are compressed by aluminium section bar depression bar, and threaded block is fixed on aluminum section bar frame
The present invention proposes the measuring method that string static rigidity measurement mechanism patted by above-mentioned tennis simultaneously, comprises the following steps:
Step 1, by tennis racket clamping between two pieces of clamping plates of clamping part, then by depression bar by clamp device clamping in frame;
Step 2, sensor installation detecting portion above depression bar;
Step 3, utilizes power section to apply pressure to tennis face, adopts PLC Real-time Collection pressure sensor signal, and controls motor;
Step 4, the deflection at laser displacement sensor Test Network racket string pressurized place.
The process that above-mentioned test causes tennis racket to be out of shape when can simulate tennis collision face.
Apparatus of the present invention are when measuring, driving lifter input shaft to rotate by shaft coupling after stepper motor is driven by PLC control and drive system makes the output screw of lifter vertically rise, the reduction gear ratio of lifter is 24:1, the deformation velocity of tennis face can be slowed down greatly, when the output screw of lifter rises, the pressure transducer top of its top attachment is to spider lower end, make spider with tennis racket towards upper distortion, such pressure transducer can be real-time the pressure suffered by measurement tennis face, now tennis racket frame is owing to being subject to the clamping of upper and lower clamping plate, and clamping plate is pressed in aluminium shape surface by depression bar, so tennis frame can not move up and down, the pressure that lifter is provided only causes the distortion of tennis face, this process is simulation tennis collision tennis racket is the process causing tennis racket to be out of shape to tennis racket applied pressure.Laser displacement sensor can move to tennis face optional position by X-Y line slideway, and when just in time moving to above spider, laser displacement sensor can measure the distortion of tennis face.
Beneficial effect: the present invention compared to existing technology, exists following significant progressive:
1, structure is simple.Involved in the present invention to framework be adopt aluminium section bar to build, simply firmly, the number of parts involved by device is few, installs easily;
2, control simple and reliable.What control section of the present invention adopted is that PLC controls, and stepper motor can be made to stop when any force value, and the next target pressure value of program Lookup protocol, has and control simple and reliable feature.
Except technical matters, the technical characteristic forming technical scheme and the advantage brought by the technical characteristic of these technical schemes that the present invention recited above solves, the advantage that the other technologies feature that comprises in other technologies problem that string static rigidity measurement mechanism and method can solve, technical scheme and these technical characteristics bring patted by tennis of the present invention, will be described in more detail by reference to the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the structural representation of Fig. 1 medium power part;
Fig. 3 is the structural representation at clamp device in Fig. 1;
Fig. 4 is the structural representation of sensor detecting portion in Fig. 1;
In figure: lifter 1, shaft coupling 2, stepper motor 3, stepper motor erecting frame 4, threaded block 5, tie down screw 6, padded aluminium section bar 7, lower clamping plate 8, upper clamping plate 9, X-direction line slideway 10, laser displacement sensor 11, Y-direction line slideway 12, aluminium section bar depression bar 13, spider 14, tennis racket 15, lifter installing plate 16, sensor connecting piece 17, pressure transducer 18.
Embodiment
Embodiment:
The tennis racket string static rigidity measurement mechanism of the present embodiment as shown in Figure 1, comprises aluminum section bar frame and the power section be arranged on aluminum section bar frame, clamping part and sensor detecting portion.Comprise lifter 1, shaft coupling 2, stepper motor 3, stepper motor erecting frame 4, threaded block 5, tie down screw 6, padded aluminium section bar 7, lower clamping plate 8, upper clamping plate 9, X-direction line slideway 10, laser displacement sensor 11, Y-direction line slideway 12, aluminium section bar depression bar 13, spider 14, tennis racket 15 and lifter installing plate 16.
Wherein, stepper motor 3 is connected by shaft coupling 2 with lifter 1, lifter 1 is arranged on base of frame by lifter installing plate 16, the screw tip of lifter 1 connects with pressure transducer, pressure transducer is in below spider 14, spider about 14 is clamped in claps on string, clamp device is pressed in aluminum section frame top of the trellis by aluminium section bar depression bar 13, X-direction line slideway 10 is fixed on aluminium section bar depression bar 13, Y direction line slideway 12 is connected on the slide block of X-direction line slideway 10 by guide rail splice, laser displacement sensor 11 connects with the slide block of Y direction line slideway 12, make laser displacement sensor 11 can along plane movement arbitrarily.
As shown in Figure 2, in power section, lifter installing plate 16 is fixed on bottom aluminum section bar frame by bolt-connection, stepper motor 3 is fixed on stepper motor erecting frame 4 by bolt-connection, stepper motor erecting frame 4 is fixed on lifter installing plate 16 by bolt-connection, lifter 1 is fixed on lifter installing plate 16 by bolt-connection, the output shaft of stepper motor 3 is concentric with the input shaft of lifter 1, is linked together by the input shaft of shaft coupling 2 by the output shaft of stepper motor 3 and lifter 1.The output screw top of lifter 1 is connected with sensor connecting piece 17 by thread connection, and sensor connecting piece 17 and pressure transducer 18 are fixed together by thread connection.The point of crossing that spider 14 is tightly locked in tennis racket string contacts with pressure transducer 18.
As shown in Figure 3, in clamp device, tennis racket 15 is clipped in the middle with lower clamping plate 8 by upper clamping plate 9, upper clamping plate 9 is locked by bolt-connection with lower clamping plate 8, two padded aluminium section bars 7 are separately installed with in lower clamping plate 8 left and right sides, object is convenient to aluminium section bar depression bar 13 can be pressed on padded aluminium section bar 7 and not interfere with upper clamping plate 9, the clamping part be made up of with padded aluminium section bar 7 upper clamping plate 9, lower clamping plate 8 is placed directly in aluminium section bar upper surface, facilitates random mobile network racket 15 to remove to measure the rigidity value of face difference.Four threaded blocks 5 are fixed on aluminium section bar upper surface by bolt-connection, two aluminium section bar depression bar 13 punching two ends, four tie down screws 6 are fixed together by thread connection through the hole at two aluminium section bar depression bar 13 two ends and threaded block 5, clamping part can be pressed in aluminium section bar upper surface so motionless by tie down screw 6, aluminium section bar depression bar 13.
As shown in Figure 4, sensor detecting portion is used for the measurement of tennis racket facial disfigurement, two width X-direction line slideways 10 are fixed on aluminium section bar depression bar 13 by bolt-connection, and Y-direction line slideway 12 is fixed on the slide block of two width X-direction line slideways 10 by bolt-connection.Laser displacement sensor 11 is fixed on the slide block of Y-direction line slideway 12 by bolt-connection, and such laser displacement sensor 11 can movement arbitrarily in the plane, be convenient to measure face deflection a little.
The course of work of above-mentioned tennis racket string static rigidity measurement mechanism is as follows:
The light beam of laser displacement sensor 11 is aimed at the upper surface center of circle of spider 14 by experiment at the beginning, rotates four tie down screws 6 and tennis racket clamping part is pressed in aluminium section bar upper surface.Stepper motor 3 drives lifter 1 input shaft to rotate, the translating rotation of input shaft is become the rectilinear motion of lifter 1 output screw by lifter 1, lifter 1 output screw moves upward with sensor connecting piece 17 and pressure transducer 18 and withstands spider 14, spider 14 can drive tennis racket string generation deformation, now pressure transducer 18 can gather the pressure that tennis racket string receives, and feed back in PLC, that PLC sends instruction and makes step motor stop when force value reaches desired value, now read the value of laser displacement sensor, force value and shift value are brought into the rigidity value that Rigidity Calculation formula just can calculate this point.
When the rigidity of other points of Test Network string, first come loose four tie down screws 6, mobile network racket clamping part, makes to record a little to aim at pressure transducer 18, then lock four tie down screws 6, repeats the rigidity value that said process can measure other points.
Below by reference to the accompanying drawings embodiments of the present invention are described in detail, but the present invention is not limited to described embodiment.For those of ordinary skill in the art, in the scope of principle of the present invention and technological thought, multiple change, amendment, replacement and distortion are carried out to these embodiments and still falls within the scope of protection of the present invention.
Claims (8)
1. string static rigidity measurement mechanism patted by a tennis, comprise rack-mounted power section, clamping part and sensor detecting portion, it is characterized in that: described clamping part is used for the tested tennis racket of clamping, described power section is used for applying pressure to tennis face, described sensor detecting portion is for measuring the deflection of tennis face, described power section is arranged on the side of clamping part, and described sensor detecting portion is arranged on the opposite side of clamping part.
2. string static rigidity measurement mechanism patted by tennis according to claim 1, it is characterized in that: described power section comprises the spider, pressure transducer, lifter and the motor that connect successively, and described spider pats string for clamping tennis.
3. string static rigidity measurement mechanism patted by tennis according to claim 2, it is characterized in that: described sensor detecting portion comprises displacement mechanism and laser displacement sensor, described laser displacement sensor is for measuring the displacement of spider upper surface, and institute's displacement mechanism moves on tennis face for driving laser displacement sensor.
4. string static rigidity measurement mechanism patted by tennis according to claim 2, it is characterized in that: described motor is stepper motor, described clamping part has two pieces for clamping the clamping plate of tennis racket, and the position that on described clamping plate, string patted by corresponding tennis offers through hole.
5. string static rigidity measurement mechanism patted by tennis according to claim 3, it is characterized in that: institute's displacement mechanism is X-Y line slideway, comprise X-direction line slideway, X-direction slide block, Y direction line slideway and Y direction slide block, described X-direction line slideway is fixed in frame, described Y direction line slideway is connected on described X-direction slide block by guide rail splice, and described laser displacement sensor connects with described Y direction slide block.
6. string static rigidity measurement mechanism patted by tennis according to claim 1, it is characterized in that: described frame is aluminum section bar frame.
7. string static rigidity measurement mechanism patted by tennis according to claim 1, it is characterized in that: described clamp device is fitted in frame top by depression bar, and described depression bar is arranged in frame by securing member.
8. the measuring method of string static rigidity measurement mechanism patted by tennis according to claim 1, it is characterized in that comprising the following steps:
Step 1, by tennis racket clamping between two pieces of clamping plates of clamping part, then by depression bar by clamp device clamping in frame;
Step 2, sensor installation detecting portion above depression bar;
Step 3, utilizes power section to apply pressure to tennis face, adopts PLC Real-time Collection pressure sensor signal, and controls motor;
Step 4, the deflection at laser displacement sensor Test Network racket string pressurized place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510716580.9A CN105388064B (en) | 2015-10-29 | 2015-10-29 | Tennis pats string static rigidity measurement apparatus and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510716580.9A CN105388064B (en) | 2015-10-29 | 2015-10-29 | Tennis pats string static rigidity measurement apparatus and method |
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| Publication Number | Publication Date |
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| CN105388064A true CN105388064A (en) | 2016-03-09 |
| CN105388064B CN105388064B (en) | 2017-11-03 |
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| CN201510716580.9A Active CN105388064B (en) | 2015-10-29 | 2015-10-29 | Tennis pats string static rigidity measurement apparatus and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109489921A (en) * | 2018-07-02 | 2019-03-19 | 马鞍山清净环保科技有限公司 | A kind of racket head control device and its application method for multifunctional racket tester |
| CN109507031A (en) * | 2018-12-20 | 2019-03-22 | 南通理工学院 | A kind of welding rigidity detection device |
| CN114459892A (en) * | 2022-02-21 | 2022-05-10 | 江苏普乐菲新材料有限公司 | Intelligent racket string strength detection equipment |
| US11607589B1 (en) | 2020-10-01 | 2023-03-21 | Mark E. Van Denend | Device for accurately measuring string bed stiffness in a racket |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109507031A (en) * | 2018-12-20 | 2019-03-22 | 南通理工学院 | A kind of welding rigidity detection device |
| US11607589B1 (en) | 2020-10-01 | 2023-03-21 | Mark E. Van Denend | Device for accurately measuring string bed stiffness in a racket |
| CN114459892A (en) * | 2022-02-21 | 2022-05-10 | 江苏普乐菲新材料有限公司 | Intelligent racket string strength detection equipment |
| CN114459892B (en) * | 2022-02-21 | 2023-11-24 | 江苏普乐菲新材料有限公司 | Racket line intensity intelligent detection equipment |
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|---|---|
| CN105388064B (en) | 2017-11-03 |
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