CN118698105A - A tennis ball quality control rebound height test device - Google Patents

Abstract

The invention relates to the technical field of tennis ball detection, and specifically to a tennis ball quality control rebound height testing device, comprising: a fixed plate, and also comprising: a hole plate arranged on the horizontal end surface of the fixed plate, a plurality of through holes are provided on the main surface of the hole plate, the plurality of through holes are distributed along an array, a launching device is arranged at the top end of the fixed plate, a marking device is arranged in the through hole, the launching device comprises: one end of a main shaft is arranged at the top end of the fixed plate along the normal direction of the main plane of the fixed plate, a rotating wheel is rotatably arranged on the outer wall of the main shaft, a ball groove is provided on the annular outer wall of the rotating wheel, one end of a coil spring is arranged between the main shaft and the rotating wheel, a cover plate is arranged on the outer side of the rotating wheel, the cover plate is fixedly connected to the main shaft, a wrench is clamped on the outer wall of the rotating wheel, and compared with the current testing equipment, the device has higher stability and convenient operation, and simplifies the equipment and reduces the cost.

Description

A tennis ball quality control rebound height test device

Technical Field

The invention relates to the technical field of tennis ball detection, in particular to a tennis ball quality control rebound height testing device.

Background Art

The tennis ball quality control rebound height test is an important step to ensure that the tennis ball meets the standards and performance requirements. According to regulations, the tennis ball needs to fall freely from a height of 254 cm to a hard surface. The tennis ball meets the standards if its rebound height is within the standard value range of 135 cm to 147 cm. In order to meet the drop height requirements, the current test device usually has a drop end height higher than 254 cm. The high height of the equipment has a great impact on the stability of the equipment itself and the ease of operation. In addition, the current test equipment uses electronic sensors or laser rangefinders to measure the height of the tennis ball. However, in order to ensure the accuracy of the sensor or rangefinder, it is necessary to limit conditions such as light. At the same time, the equipment needs to be regularly maintained and cleaned, which makes it complex and costly.

Summary of the invention

The object of the present invention is to provide a tennis ball quality control rebound height testing device to solve the problems raised in the above background technology.

To achieve the above object, the present invention provides the following technical solution: a tennis ball quality control rebound height testing device, comprising: a fixing plate, and further comprising:

A hole plate is arranged on the horizontal end surface of the fixed plate, and a plurality of through holes are provided on the main surface of the hole plate, and the plurality of through holes are distributed along an array;

A launching device, arranged on the top of the fixing plate;

A marking device, disposed in the through hole;

The transmitting device comprises:

A main shaft, one end of which is arranged at the top of the fixing plate along the normal direction of the main plane of the fixing plate;

A rotating wheel is rotatably arranged on the outer wall of the main shaft, and a ball groove is formed on the annular outer wall of the rotating wheel;

A coil spring, disposed between the main shaft and the rotating wheel;

A cover plate, arranged on the outer side of the rotating wheel, and the cover plate is fixedly connected to the main shaft;

The wrench is clamped on the outer wall of the rotating wheel.

Preferably, the marking device comprises:

A fixing ring, inserted into the through hole;

A ball head, arranged in the inner cavity of the fixing ring;

A lever, arranged on the axis of the fixing ring through a ball head;

A baffle plate is arranged on the inner wall of the fixing ring;

A base is arranged on the end surface of the fixing ring, and a groove is formed on the end surface of the base facing the fixing ring;

An insertion rod, the insertion rod is inserted into the base, and two ends of the insertion rod respectively penetrate two opposite end surfaces of the base;

A first magnet is disposed on the end surface of the insertion rod located in the groove;

The second magnet is arranged on the end surface of the lever pointing to the base.

Preferably, along the radial direction of the rotating wheel, the distance between the bottom of the ball groove and the cover plate is between 6 cm and 7 cm.

Preferably, the orifice plate is formed by splicing a plurality of strip-shaped plates.

Preferably, the baffle is in a rounded V-shaped structure, and the axis of the corner of the baffle is colinear with the central axis of the fixing ring.

Preferably, the magnetic poles of the opposing surfaces of the first magnet and the second magnet are the same.

Preferably, the end of the insertion rod away from the fixing ring is in a brazing structure, and the end extends along the axial direction of the fixing ring.

Preferably, the weight of the end of the lever away from the fixing ring is greater than the weight of the end of the lever located in the inner cavity of the fixing ring.

Preferably, along the axis direction of the lever, the distance between the inner wall of the groove and the end of the lever remains unchanged.

The present invention proposes a tennis ball quality control rebound height testing device, which has the beneficial effect that: the present invention provides driving force to the rotating wheel through a coil spring, and cooperates with a cover plate to throw the tennis ball along the tangential direction of the rotating wheel, so that it has a certain acceleration, simulating the free fall motion of the tennis ball at a standard height, thereby reducing the height of the equipment, improving the stability of the equipment and the convenience of operation.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the structure of the present invention;

FIG2 is a schematic diagram of a fixed plate and a perforated plate of the present invention;

FIG3 is a schematic diagram of a launching device of the present invention;

FIG4 is a schematic diagram of a marking device of the present invention;

FIG5 is a rear view of the fixing plate and the orifice plate of the present invention;

Fig. 6 is a schematic diagram of the main shaft of the present invention;

FIG7 is a partial front view of the marking device of the present invention;

FIG8 is a schematic diagram of a rotating wheel according to the present invention.

In the figure: 11, fixing plate, 12, slot, 211, orifice plate, 212, limit slot, 22, through hole, 3, bottom plate, 4, launching device, 411, main shaft, 412, collar, 413, protrusion, 414, nut, 421, rotating wheel, 422, slot, 423, ball slot, 43, coil spring, 441, cover plate, 442, through slot, 45, wrench, 46, ball throwing bucket, 47, pressure plate, 48, bracket, 5, marking device, 51, fixing ring, 52, ball head, 53, lever, 54, baffle, 551, base, 552, groove, 55, plug rod, 56, first magnet, 57, second magnet.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Please refer to Figures 1-8. The present invention provides a technical solution for a tennis ball quality control rebound height test device. The detailed connection means are well known in the art. The following mainly introduces the working principle and process. The specific operations are as follows.

A tennis ball quality control rebound height testing device comprises: a fixing plate 11, a hole plate 211, a launching device 4 and a marking device 5.

The orifice plate 211 is arranged on the horizontal end surface of the fixed plate 11, and a plurality of through holes 22 are provided on the main surface of the orifice plate 211, and the plurality of through holes 22 are distributed along the array. The orifice plate 211 and the fixed plate 11 are connected in a detachable splicing manner. A horizontal bottom plate 3 is provided at the bottom ends of the fixed plate 11 and the orifice plate 211 to support the device. The launching device 4 is arranged on the top of the fixed plate 11, and the launching device 4 can provide a certain initial velocity for the tennis ball to meet the requirement that when the tennis ball is thrown below the standard height, it has the same acceleration as when it falls freely at the standard height. Under the premise of ensuring the test effect, the launching height of the tennis ball is reduced, thereby reducing the height of the device. The marking device 5 is arranged in the through hole 22, and the tennis ball contacts the marking device 5 after bouncing up, leaving a mark, thereby achieving the effect of recording height information. The height marking is achieved in a mechanical manner, which reduces the complexity of the device, reduces the risk of equipment failure and data loss, and also reduces the cost.

The launching device 4 includes: a main shaft 411 , a rotating wheel 421 , a coil spring 43 , a cover plate 441 and a wrench 45 .

One end of the main shaft 411 is arranged at the top end of the fixed plate 11 along the normal direction of the main plane of the fixed plate 11, and the main shaft 411 and the fixed plate 11 are rotatably connected. A bracket 48 is arranged on the far end of the main shaft 411 away from the fixed plate 11, and the bracket 48 is arranged on the fixed plate 11 to support the main shaft 411 and prevent the main shaft 411 from moving along its own axial direction. The end of the main shaft 411 connected to the fixed plate 11 is the first end of the main shaft 411, and the first end face of the main shaft 411 extends out of the side wall of the fixed plate 11. The outer wall of the main shaft 411 is splined with a collar 412, and a protrusion 413 is arranged on the end face of the collar 412 pointing to the fixed plate 11. A slot 12 is opened at the corresponding position of the fixed plate 11, and a nut 414 is screwed on the first end of the main shaft 411, and the nut 414 abuts against the collar 412 , by tightening the nut 414, the protrusion 413 on the ring 412 is inserted into the slot 12, and the spline connection relationship between the ring 412 and the main shaft 411 is matched to fix the main shaft 411, wherein the bracket 48 is arranged directly below the rotating wheel 421, and the rotating wheel 421 is rotatably arranged on the outer wall of the main shaft 411, and a ball groove 423 is opened on the annular outer wall of the rotating wheel 421, and the tennis ball can be placed in the ball groove 423. At the same time, the design of the ball groove 423 can ensure that the tennis ball can be thrown out smoothly when the rotating wheel 421 rotates. The coil spring 43 is arranged between the main shaft 411 and the rotating wheel 421, one end of the coil spring 43 is connected to the outer wall of the main shaft 411, and the other end of the coil spring 43 is connected to the inner wall of the rotating wheel 421. The force of the coil spring 43 is used to ensure that after the rotating wheel 421 is rotated in the positive direction by a certain angle, the rotating wheel 421 has The cover plate 441 is arranged on the outer side of the rotating wheel 421, and the cover plate 441 is fixedly connected to the main shaft 411. The cover plate 441 is used to limit the moving path of the tennis ball, so that the tennis ball can be thrown out along the tangential direction of the rotating wheel 421. The wrench 45 is clamped on the outer wall of the rotating wheel 421, and the rotating wheel 421 is driven to rotate in the reverse direction by the wrench 45. After releasing the wrench 45, the rotating wheel 421 will rotate under the action of the coil spring 43. At the same time, a plurality of slots 422 are provided on the rotating wheel 421 with the same rotation angle, and the wrench 45 can be arbitrarily clamped in one of the slots 422. The bracket 48 is located on the rotation path of the wrench 45, and the bracket 48 can block the wrench 45. By changing the position of the wrench 45, the rotating wheel 421 with a fixed angle can be rotated. The top surface of the fixed plate 11 is also provided with a pitching bucket 46. The lower opening of the ball bucket 46 corresponds to the position of the ball groove 423. A number of tennis balls are placed in the ball throwing bucket 46. Through the reciprocating rotation of the rotating wheel 421, one tennis ball can fall into the ball groove 423 in each reciprocating cycle. A through groove 442 is provided on the midline position of the arc-shaped outer wall of the cover plate 441. The size of the through groove 442 is smaller than the diameter of the tennis ball. A pressure plate 47 is provided on the outer wall of the ball throwing bucket 46. The pressure plate 47 is an arc-shaped plate-like structure, and the pressure plate 47 is located in the through groove 442. The pressure plate 47 and the cover plate 441 match each other, and there is a sliding connection relationship between the two, so as to ensure that the tennis ball makes a circular motion with the rotating wheel 421 between the ball throwing bucket 46 and the bottom end of the cover plate 441. At the same time, the angle of the cover plate 441 can be changed by changing the rotation angle of the main shaft 411, thereby changing the angle of the tennis ball thrown out of the ball groove 423.

The marking device 5 includes: a fixing ring 51 , a ball head 52 , a lever 53 , a baffle 54 , a base 551 , an inserting rod 55 , a first magnet 56 and a second magnet 57 .

The fixing ring 51 is inserted into the through hole 22, and there is a slight interference fit between the fixing ring 51 and the through hole 22. The fixing ring 51 can be installed and removed manually. At the same time, when the fixing ring 51 is in the through hole 22, there will be no relative movement between the fixing ring 51 and the through hole 22. The ball head 52 is arranged in the inner cavity of the fixing ring 51, including but not limited to the use of a connecting piece such as the ball head 52 to ensure that the lever 53 can swing at multiple angles in the through hole 22. The ball head 52 uses a lightweight material and a low-friction bearing to reduce rotational resistance. The lever 53 is arranged on the axis of the fixing ring 51 through the ball head 52. When the lever 53 is not subjected to external force, the axis of the lever 53 is in a colinear state with the axis of the fixing ring 51. At the same time, the lever 53 is in the maximum rotation state in the vertical direction, close to and perpendicular to the ground, to avoid the lever 53 being blocked from rotating to the maximum angle, thereby hindering the movement of the tennis ball, thereby affecting the test results. The baffle 54 is arranged on the inner wall of the fixing ring 51 to block The plate 54 is located at the end of the lever 53 in the inner cavity of the fixed ring 51, so that the lever 53 is in a horizontal state when no external force is applied. The base 551 is arranged on the end surface of the fixed ring 51. The end surface of the base 551 pointing to the side of the fixed ring 51 is provided with a groove 552. The plug rod 55 is plugged into the base 551, and the two ends of the plug rod 55 respectively penetrate the two opposite end surfaces of the base 551. The plug rod 55 and the base 551 are slidably connected. At the same time, the number of the plug rods 55 is Several, one end of the rod 55 is located in the groove 552 and is distributed in a spherical array. The rod 55 is located at the end away from the fixing ring 51 and is distributed on the end surface of the base 551 in a rectangular array. When the end of the rod 55 located in the groove 552 is squeezed, the other end of the rod 55 will extend out of the end surface of the base 551. The first magnet 56 is arranged on the end surface of the rod 55 located in the groove 552, and the second magnet 57 is arranged on the end surface of the lever 53 pointing to the base 551.

Along the radial direction of the rotating wheel 421 , the distance between the bottom of the ball groove 423 and the cover plate 441 is between 6 cm and 7 cm. When the tennis ball is located in the ball groove 423 , the rotating wheel 421 is rotated, and the tennis ball can make a circular motion with the rotating wheel 421 , and maintain this motion state under the action of the cover plate 441 .

The orifice plate 211 is formed by splicing a plurality of strip-shaped plates. The number of the strip-shaped plates can be increased in the horizontal direction or the vertical direction as required, thereby increasing the measurable range.

The baffle 54 is in a rounded V-shaped structure, and the axis of the corner of the baffle 54 is colinear with the central axis of the fixing ring 51. Since the tennis ball rebounds in a parabolic trajectory after being launched, the lever 53 will return to a horizontal state under the action of gravity after being hit by the tennis ball. The V-shaped baffle 54 can cause the lever 53 to return to a direction colinear with the axis of the fixing ring 51, which is convenient for the next test.

The magnetic poles of the first magnet 56 and the second magnet 57 facing each other are the same. When the lever 53 moves, the first magnet 56 corresponding to the second magnet 57 will be pushed outward along with the movement of the lever 53, thereby moving the corresponding insertion rod 55.

The end of the insertion rod 55 away from the fixing ring 51 is in a brazing structure, and the end extends along the axial direction of the fixing ring 51. A limiting groove 212 is provided on the edge of the end surface of the orifice plate 211 away from the fixing ring 51. The limiting groove 212 can be used to insert a cardboard at the back of the orifice plate 211. When the lever 53 moves, the corresponding insertion rod 55 will extend, and the brazing structure will leave a hole on the cardboard. By measuring the corresponding hole position, the rebound height value can be obtained.

The driving force provided by the coil spring 43 and the height value of the corresponding hole position can be obtained through advance measurement, and the specific values are not recorded in this solution.

The weight of the end of the lever 53 away from the fixing ring 51 is greater than the weight of the end of the lever 53 located in the inner cavity of the fixing ring 51. After the lever 53 is hit by the tennis ball, gravity and the cooperation of the baffle 54 can ensure that the lever 53 automatically returns to a position in line with the axis of the fixing ring 51, which is convenient for the next test.

Along the axis direction of the lever 53, the distance between the inner wall of the groove 552 and the end of the lever 53 remains unchanged. The inner wall of the groove 552 is partially spherical, ensuring that the magnetic force between the first magnet 56 and the second magnet 57 at different positions is as similar as possible, while reducing the influence of the magnetic force on the lever 53.

Working principle:

First, adjust the angle of the cover plate 441 to adjust the launching angle of the tennis ball to the desired angle, then sleeve the ring 412 onto the main shaft 411 so that the protrusion 413 on the ring 412 is inserted into the slot 12, and then tighten the bolt to fix the main shaft 411, thereby fixing the angle of the cover plate 441, and then place a tennis ball that meets the standard into the pitching bucket 46, and engage the wrench 45 into the desired slot 422 as needed, and rotate the wheel 421 with the wrench 45, so that the coil spring 43 is compressed until the tennis ball enters the ball slot 423, and then release the wrench 45, and use the force of the coil spring 43 to drive the wheel 421 to rotate, so that the tennis ball is launched and the tennis ball is launched. After the ball contacts the bottom plate 3, it is bounced back. At this time, the highest point of the tennis ball is visually observed, and then the marking devices 5 are installed in the through holes 22 around the highest point of the visual side. At the same time, it is determined that the levers 53 in all the marking devices 5 are in a horizontal state, and then the cardboard is inserted into the limiting groove 212 so that the cardboard fits the end surface of the base 551, and then the wrench 45 is repeatedly pulled to launch multiple tennis balls in sequence. The tennis balls hit the lever 53, and the lever 53 is deflected. The second magnet 57 and the corresponding first magnet 56 in the path of the lever 53 will all move outward, and the insertion rod 55 will be inserted into the cardboard to leave a hole mark. By measuring the height of the hole, it is determined whether the tennis ball meets the standard.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. A tennis ball quality control rebound height test device, characterized in that it comprises: a fixing plate (11), and further comprises: A perforated plate (211) is arranged on the horizontal end surface of the fixed plate (11), a plurality of through holes (22) are provided on the main surface of the perforated plate (211), and the plurality of through holes (22) are distributed along an array; A launching device (4) is arranged on the top of the fixing plate (11); A marking device (5) is arranged in the through hole (22); The transmitting device (4) comprises: A main shaft (411), one end of the main shaft (411) being arranged at the top end of the fixing plate (11) along the normal direction of the main plane of the fixing plate (11); A rotating wheel (421) is rotatably disposed on the outer wall of the main shaft (411), and a ball groove (423) is formed on the annular outer wall of the rotating wheel (421); A coil spring (43) is arranged between the main shaft (411) and the rotating wheel (421); A cover plate (441) is arranged on the outer side of the rotating wheel (421), and the cover plate (441) is fixedly connected to the main shaft (411); The wrench (45) is clamped on the outer wall of the rotating wheel (421). 2. A tennis ball quality control rebound height testing device according to claim 1, characterized in that the marking device (5) comprises: A fixing ring (51) inserted into the through hole (22); A ball head (52) is arranged in the inner cavity of the fixing ring (51); A lever (53) is arranged on the axis of the fixing ring (51) through a ball head (52); A baffle (54) is arranged on the inner wall of the fixing ring (51); A base (551) is arranged on the end surface of the fixing ring (51), and a groove (552) is formed on the end surface of the base (551) facing the fixing ring (51); An insertion rod (55), the insertion rod (55) is inserted into the base (551), and two ends of the insertion rod (55) respectively penetrate two opposite end surfaces of the base (551); A first magnet (56) is disposed on the end surface of the insertion rod (55) located in the groove (552); The second magnet (57) is arranged on the end surface of the lever (53) pointing toward the base (551). 3. A tennis ball quality control rebound height testing device according to claim 1, characterized in that: along the radial direction of the rotating wheel (421), the distance between the bottom of the ball groove (423) and the cover plate (441) is between 6 cm and 7 cm. 4. A tennis ball quality control rebound height testing device according to claim 1, characterized in that the orifice plate (211) is formed by splicing a plurality of strip-shaped plates. 5. A tennis ball quality control rebound height test device according to claim 2, characterized in that: the baffle (54) is a rounded V-shaped structure, and the axis of the corner of the baffle (54) is colinear with the central axis of the fixing ring (51). 6. A tennis ball quality control rebound height test device according to claim 2, characterized in that the magnetic poles of the opposing surfaces of the first magnet (56) and the second magnet (57) are the same. 7. A tennis ball quality control rebound height testing device according to claim 2, characterized in that the end of the insert rod (55) away from the fixing ring (51) is in a brazing structure, and the end extends along the axis direction of the fixing ring (51). 8. A tennis ball quality control rebound height testing device according to claim 2, characterized in that the weight of the end of the lever (53) away from the fixing ring (51) is greater than the weight of the end of the lever (53) located in the inner cavity of the fixing ring (51). 9. A tennis ball quality control rebound height testing device according to claim 2, characterized in that: along the axis direction of the lever (53), the distance between the inner wall of the groove (552) and the end of the lever (53) remains unchanged.