CN106345704A - Seamless table tennis ball bounce performance detection and sorting device - Google Patents

Abstract

The invention discloses a seamless table tennis bouncing performance detection and sorting device, which includes a ball supply device, a bounce device, a bounce collision information collection and processing device, and a ball collection device; the ball supply device includes a ball supply hopper and a feeding pipe connected in sequence , the ball supply turntable and the ball-out bend; the ball-out bend is provided with a goal section and a ball-out section, and the ball-out section is set horizontally; Below the ball bend, the normal direction of the ball-catching and bouncing slope is perpendicular to the axis space of the ball-out section; the ball-catching and bouncing plane is set at the bottom of the ball-catching and bouncing slope, and extends along the bouncing forward direction of the table tennis ball; bouncing and collision information collection The processing device includes a plurality of collision sensors and a processor arranged in parallel on the bouncing plane of receiving the ball. The invention can eliminate the influence of the initial falling velocity of the table tennis ball, eliminate the error caused by the uneven bounce performance in different areas of the table tennis ball surface, and can realize real-time on-line detection.

Description

A seamless table tennis bounce performance detection and sorting device

technical field

The invention relates to a device for detecting and sorting the bouncing performance of seamless table tennis balls, which is used for online detection and sorting of the bouncing performance of seamless table tennis balls.

Background technique

As my country's national sport, table tennis has become popular among sports enthusiasts. More and more people take part in table tennis after school, after work and on rest days. With the improvement of competitive technology, the quality requirements of table tennis are also increasing. higher. Seamless table tennis is a new invention following the traditional seamed ball, which has many advantages, but so far, there is no effective means for real-time online detection of various performance indicators of seamless table tennis. Manual screening from a large number of products is inefficient, the false detection rate is high, and the quality cannot be guaranteed.

According to the current latest T3 standard of the International Table Tennis Federation for 40mm table tennis balls, the quality evaluation of table tennis balls is a comprehensive evaluation of various performance indicators of table tennis balls (including weight, roundness, eccentricity, hardness, bounce, etc.). The ball falls freely from a height of 305mm onto a special steel plate. The rebound height must be greater than 240mm and less than 265mm. It can be classified as a high-quality or first-class table tennis ball. When the rebound height is not less than 240mm, it can be regarded as a qualified product, and then combined with other indicators Comprehensive evaluation such as ball weight, roundness, eccentricity, hardness and appearance.

According to the national standard GB/T20045-2005, there are several methods for detecting the bounce performance of table tennis balls: the light-controlled detection method uses the table tennis ball to fall freely and then bounces in reverse. The table tennis ball will pass through certain positions twice during the falling and rebounding process. Select a point to place the light source. There is a photosensitive element on the opposite side of the light source. The light blocking phenomenon will occur when the table tennis ball passes by. The rebound height is approximately calculated by the time interval between two light blocking times. The disadvantage of this method is that the initial falling velocity of the ping-pong ball affects the time interval between two light blockings, which brings detection errors; secondly, the light-controlled detection method cannot determine the uniformity of the bounce of the entire ping-pong ball. The sound control method is similar to the light control method, and has the same disadvantages; the slant plate pit detection method, the free-falling table tennis ball bounces through the slant plate and falls into the bunker, by measuring the position of the bunker, and calculating the rebound height by empirical formula, this The biggest disadvantage of the method is that it cannot be measured on-line in real time, which limits its popularization and application; in addition, the camera method needs a high-speed camera, which is expensive, and there is no effective way to capture the image when the table tennis ball bounces to the highest position.

Contents of the invention

In order to solve the technical problems in the known technology, the present invention provides a seamless table tennis bounce performance detection and sorting device, which can eliminate the impact of the initial velocity of the table tennis drop, and eliminate the uneven bounce performance of different areas of the table tennis surface. error, and can realize real-time online detection.

The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a seamless table tennis ball bouncing performance detection and sorting device, including a ball feeding device, a bouncing device, a bouncing collision information collection and processing device, and a ball receiving device; The ball supply device includes a ball supply hopper, a feeding pipe, a ball supply turntable and a ball discharge elbow that are connected in sequence; the ball supply hopper is provided with a conical bottom, and at the center of the conical bottom of the ball supply hopper outlet; the feeding pipe is arranged obliquely, and the inlet of the feeding pipe is connected to the outlet of the ball supply hopper through an elbow; the ball supply turntable includes a fixed support box and a runner, and the runner is composed of Driven by a motor, the first motor is fixed on the fixed support box, the runner is installed in the fixed support box, and a plurality of U-shaped evenly distributed circumferentially are arranged on the outer cylindrical surface of the runner A ball-taking groove, the opening of the U-shaped ball-taking groove faces away from the center of the runner, and a ball opening is provided on the side wall of the fixed support box, and the ball opening of the fixed support box is connected with the feeding pipe The outlet of the fixed support box is connected to the bottom of the fixed support box with a ball outlet corresponding to the position of the U-shaped ball fetching groove; the ball outlet elbow is provided with a ball outlet connected to the ball outlet of the fixed support box section and the ball-out section connected with the goal section, the ball-out section is arranged horizontally; the bouncing device includes a ball-catching bouncing slope and a ball-catching bouncing plane, and the ball-catching bouncing slope is arranged at the ball-going curve Below the tube and at the ball drop of the ball-out bend, the normal direction of the ball-catching slope is perpendicular to the axis space of the ball-out section; the ball-bouncing plane is set on the ball-bouncing slope and extend along the bouncing forward direction of the table tennis ball; the bouncing collision information collection and processing device includes a plurality of collision sensors and processors arranged in parallel on the bouncing plane of the ball, and a plurality of the collision sensors The arrangement direction is consistent with the bouncing forward direction of the table tennis balls, the processor receives the landing point signals sent by a plurality of the collision sensors and outputs the signals after processing; Connected ball receiving hoppers and a plurality of ball receiving boxes, the number of the ball receiving boxes is one more than the number of classifications of table tennis balls, a rotating ball outlet is provided below the ball collecting hopper, and the rotating ball outlet Driven by the second motor, the rotation of the second motor is controlled by the signal output by the processor; a plurality of the ball receiving boxes are arranged around the rotating ball outlet and located at the bottom of the rotating ball outlet Where the ball falls.

An anti-clogging device is provided in the conical bottom of the ball supply hopper, and the anti-clogging device includes a pusher rod, which is located above the outlet of the ball supply hopper, and the pusher rod is controlled by a crank Driven by the slider mechanism, the slider crank mechanism includes a slider connected to the push rod, the slider is arranged in the fixed guide groove, the slider is connected with the turntable through the connecting rod, and the turntable is controlled by the second Three motor drives.

The advantages and positive effects of the present invention are as follows: the bounce performance of the seamless table tennis ball is detected by the inclined surface bounce collision detection device, the structure is simple, and the operation is convenient; The impact of the initial falling velocity of the table tennis ball on the detection of the bouncing performance is investigated; by using multiple collision sensors arranged in the same direction as the bouncing forward direction of the table tennis ball to detect the bouncing performance, multiple collision points can be detected for the same table tennis ball, eliminating the need for table tennis surface bouncing The error caused by inhomogeneity makes the detection result stable and reliable. The detection method is equivalent indirect measurement, with few external interference factors, accurate measurement and high precision. The amount of signals required for detection is small, the detection speed is fast, and it is suitable for on-line measurement to realize automatic detection.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of anti-clogging device of the present invention;

Fig. 3 is a schematic diagram of the speed analysis of the table tennis ball at the moment of bouncing on the ball-catching and bouncing slope when the present invention is applied.

In the figure: 1. Ball supply hopper, 2. Processor, 3. Feeding pipe, 4. Runner, 5. Fixed support box, 6. Ball-out elbow, 7. First motor, 8. Ball-catching and bouncing slope , 9, ball bouncing plane, 10, collision sensor, 11, second motor, 12, rotating ball outlet, 13, ball collecting hopper, 14, ball collecting box, 15, push rod, 16, connecting rod, 17 , slide block, 18, the third motor, 19 rotating disks, 20, fixed guide groove.

detailed description

In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Please refer to Figures 1 to 3, a seamless table tennis bounce performance detection and sorting device, including a ball supply device, a bounce device, a bounce collision information collection and processing device, and a ball collection device.

The ball supply device includes a ball supply hopper 1, a feeding pipe 3, a ball supply turntable and a ball discharge elbow 6 connected in sequence; There is an exit in the center of the bottom.

The feeding pipe 3 is arranged obliquely, and the inlet of the feeding pipe 3 is connected with the outlet of the ball feeding hopper 1 through an elbow.

The ball supply turntable includes a fixed support box 5 and a runner 4, the runner 4 is driven by a first motor 7, the first motor 7 is fixed on the fixed support box 5, and the runner 4 is installed on In the fixed support box 5, a plurality of U-shaped ball-taking grooves uniformly distributed along the circumferential direction are arranged on the outer cylindrical surface of the runner 4, and the openings of the U-shaped ball-taking grooves face away from the center of the runner. The side wall of the fixed support box 5 is provided with a goal opening, the goal opening of the fixed support box 5 is connected with the outlet of the feeding pipe 3, and the bottom of the fixed support box 5 is provided with the The ball outlet corresponding to the position of the U-shaped ball fetching groove.

The ball outlet elbow 6 is provided with a ball outlet section connected to the ball outlet of the fixed support box 5 and a ball outlet section connected with the ball outlet section, and the ball outlet section is arranged horizontally.

The bouncing device includes a ball-receiving bouncing slope 8 and a ball-receiving bouncing plane 9, the ball-receiving bouncing slope 8 is arranged below the ball-out bend 6 and is located at the ball drop of the ball-out bend 6, the The normal direction of the ball-catching and bouncing slope 8 is perpendicular to the axial space of the ball-out section; the ball-catching and bouncing plane 9 is arranged at the bottom of the ball-catching and bouncing slope 8, and extends along the bouncing forward direction of the table tennis ball.

The bouncing collision information collection processing device comprises a plurality of parallel colliding sensors 10 and a processor 2 arranged on the bouncing plane 9 of the ball, and the arrangement direction of a plurality of colliding sensors 10 is the same as the bouncing advancing direction of the table tennis ball. Consistent; the processor 2 receives the landing point signals sent by multiple collision sensors 10 and outputs the signals after processing.

The ball receiving device includes a ball receiving hopper 13 and a plurality of ball receiving boxes 14 connected to the ball outlet end of the ball receiving and bouncing plane 9, and the number of the ball receiving boxes 14 is one more than the classification quantity of table tennis balls, one The ball receiving box 14 corresponds to one grade of seamless table tennis balls, and the extra one is used to receive defective products. A rotating ball outlet 12 is provided below the ball collecting hopper 13, the rotating ball outlet 12 is driven by a second motor 11, and the rotation of the second motor 11 is controlled by a signal output by the processor 2; A plurality of ball receiving boxes 14 are arranged around and below the rotating ball outlet 12 and are located at the ball falling place of the rotating ball outlet 12 .

In this embodiment, an anti-clogging device is provided in the conical bottom of the ball supply hopper 1, and the anti-clogging device includes a pusher rod 15, and the pusher rod 15 is located at the bottom of the ball supply hopper 1. Above the exit, the pusher rod 15 is driven by a slider crank mechanism, and the slider crank mechanism includes a slider 17 connected to the pusher rod 15, and the slider 17 is arranged in the fixed guide groove 20, so that The slider 17 is connected with the turntable 19 through the connecting rod 16, and the turntable 19 is driven by the third motor 18. The third motor 18 is stationary.

Please refer to Figure 3, v ₀ is the initial velocity of the flat throw of the table tennis ball, and the direction is perpendicular to the surface of the paper, v ₁ is the free-fall velocity, and the direction is vertically downward, v ₂ is the instantaneous rebound velocity, and the direction is related to the incline of catching the ball. The initial velocity v ₀ of the flat throw is perpendicular to the direction of the rebound instant velocity v ₂ , so the initial velocity of the table tennis ball will not affect its bouncing performance.

The method of using the above-mentioned detection and sorting device:

1) Using the inclined surface bounce collision detection equipment to carry out bounce performance calibration detection for all grades of qualified seamless table tennis products according to grades, and obtain reference calibration areas for all grades of seamless table tennis balls.

1.1) Put a plurality of qualified seamless table tennis balls of the same grade in the ball supply hopper 1, and under the action of gravity, the plurality of qualified seamless table tennis balls fall flat one by one onto the ball-catching and bouncing slope 8 , rebound to the ball bouncing plane 9 and collide with the collision sensor 10 after impact.

The running path of the seamless table tennis qualified product in the ball supply device: the seamless table tennis qualified product enters the ball supply turntable from the ball supply hopper 1 along the feeding pipe 3, driven by the runner 4 , one by one flat throwing to the ball bouncing inclined plane 8, after hitting, rebounding to the ball bouncing plane 9, and colliding with the collision sensor 10.

1.2) The processor 2 receives the landing point signal of the qualified product from the collision sensor 10, and the landing point signals of all the qualified seamless table tennis balls of the same level form an area, which is used as a reference mark for the seamless table tennis ball of the corresponding level area. Because they are table tennis balls of the same level, the landing points will be distributed in a limited area.

1.3) Steps 1.1) to 1.2) are repeated cyclically until the calibration detection of all grades of seamless table tennis qualified products is completed. How many bounce levels does the table tennis ball have, how many times the above steps are repeated in a loop.

2) Write the reference demarcated areas of all grades of seamless table tennis balls into the processor 2 .

3) The seamless table tennis balls to be tested are detected and sorted by using the inclined plane bounce collision detection equipment.

3.1) Put the seamless table tennis balls to be tested in the ball supply hopper 1, and under the action of gravity, the seamless table tennis balls to be tested are thrown flat one by one onto the ball-catching and bouncing slope 8, and rebound to the The ball collides with the collision sensor 10 on the bouncing plane 9 . The running path of the seamless table tennis ball to be tested in the ball supply device is the same as that of the qualified seamless table tennis ball in the ball supply device.

3.2) The processor 2 receives the ball landing signal from the collision sensor 10, then compares the ball landing signal with the reference calibration area of all grades of seamless table tennis balls, and then according to the The grade of the ball to be tested is determined by the reference calibration area of the seamless table tennis ball of the grade where the ball drop point signal is located, and then the second motor 11 is controlled to rotate to a set position according to the grade of the ball to be tested, so that the ball to be tested falls into the corresponding grade 14 of ball receiving boxes.

Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, people can also make many forms without departing from the purpose of the present invention and the scope of protection of the claims, and these all belong to the protection scope of the present invention.

Claims (2)

1. a kind of seamless table tennis anti-pumping performance grouping system device is it is characterised in that include supplying device of ball, bouncer, bullet Jump collision information acquisition processing device and ball collecting device；

Confession ball hopper that described supplying device of ball includes being sequentially connected, tremie pipe, for ball rotating disk with go out ball bend pipe；Described confession ball hopper It is provided with tapered bottom, be provided with outlet in the central authorities at the tapered bottom of described confession ball hopper；Described tremie pipe is obliquely installed, described tremie pipe Import is connected with the outlet of described confession ball hopper by elbow；Described confession ball rotating disk includes fixing supporting case and runner, described turn By the first Motor drive, described first motor is fixed on described fixing supporting case wheel, and described runner is arranged on described fixation and props up In support box, multiple u-shapeds being evenly distributed are provided with the external cylindrical surface of described runner and take ball groove, described u-shaped takes ball groove Opening dorsad roller centre, is provided with ball hole on the side wall of described fixing supporting case, the ball hole of described fixing supporting case with The outlet of described tremie pipe is connected, and is provided with described fixing supporting case bottom and takes the corresponding ball mouth in ball groove position with described u-shaped； Described go out ball bend pipe be provided with the goal section being connected with the ball mouth of described fixing supporting case and go out ball with described goal section is connected Section, described go out ball section be horizontally disposed with；

Described bouncer includes receiving spring inclined-plane and spring plane of receiving, described spring inclined-plane of receiving be arranged on described in go out ball The lower section of bend pipe and be located at described go out ball bend pipe falling sphere at, the normal direction on described spring inclined-plane of receiving with described go out ball section Axial space is vertical；Described spring plane of receiving is received the bottom on spring inclined-plane described in being arranged on, and along before the spring of table tennis Enter direction to extend；

Described spring collision information acquisition processing device include being arranged on described in receive in spring plane multiple be arranged in parallel Crash sensor and processor, the orientation of multiple described crash sensors is consistent with the spring direction of advance of table tennis, institute State processor and receive the drop point signal that multiple described crash sensors send output signal after treatment；

Described ball collecting device includes going out receipts ball hopper and the multiple receipts ball case that ball end connects, described receipts with described spring plane of receiving The quantity of ball case, one more than the classification quantity of table tennis, is provided with rotation ball mouth, described rotation in the described lower section receiving ball hopper Turn ball mouth by the second Motor drive, the rotation of described second motor is controlled by the signal that described processor exports；Multiple described Receive ball case and be arranged in the surrounding lower section of described rotation ball mouth and at the falling sphere of described rotation ball mouth.

2. seamless table tennis anti-pumping performance grouping system device according to claim 1 is it is characterised in that in described confession ball It is provided with preventing clogging up device, described preventing clogging up device includes a ball pushing rod, described ball pushing rod is located at described confession in the tapered bottom of hopper Above the outlet of ball hopper, described ball pushing rod is driven by slider-crank mechanism, and described slider-crank mechanism includes pushing the ball with described The slide block that bar is connected, described slide block is arranged in fixing guide groove, and described slide block is connected with rotating disk by connecting rod, and described rotating disk is by the Three Motor drives.