An impact resistance testing device for basketball boards

Abstract

The present invention relates to the technical field of impact testing of basketball boards, and more particularly to an impact testing device for basketball boards, comprising a test main frame and a basketball board to be tested, wherein a mounting structure for disassembling and fixing the basketball board is mounted on the upper side of one end of the test main frame, a guide structure is mounted on the upper side of the other end of the test main frame, an impact ball is mounted on the upper side of the test main frame, the impact ball passes through the interior of the guide structure, a traction structure is mounted on the side of the guide structure away from the mounting structure to pull the impact ball, and an angle control structure is mounted on the test main frame to control the angle of the guide structure. The present invention can cause an impact ball to be ejected from the guide structure to impact the basketball board, and then the traction structure can pull the impact ball ejected from the guide structure back into the guide structure, facilitating the impact structure to impact the impact ball again, and then eject the impact ball from the guide structure again, so that the impact ball can stably and continuously impact the basketball board.

Description

Technical Field

[0001] The present invention relates to the technical field of impact testing of basketball boards, and in particular to an impact resistance testing device for basketball boards. Background Art

[0002] The basketball stand consists of a supporting base and a basketball board. The basketball board is often hit by basketballs during use, so it is necessary to ensure that it has sufficient hardness and toughness during production. Basketball board samples will be tested during production, generally by controlling the impact of the ball on the basketball board.

[0003] Chinese patent CN118225368B discloses a device for detecting the impact resistance of a basketball stand for sports equipment, comprising a rotating ring and multiple control boxes, wherein a material barrel is fixedly connected to the upper side of the multiple control boxes, and four support rods are fixedly connected to the lower side of the multiple control boxes. The lower sides of the four support rods are respectively fixedly connected to the same fixed plate, and the fixed plate is located on the upper side of the rotating ring and fixedly connected to the rotating ring. A rotating device for the rotating ring and the control box is provided on the outer side of the rotating ring; the rotating device comprises a bottom ring, a top ring, a motor, a fixed gear ring, and a first gear. In the process of testing the impact resistance of the basketball stand, the invention places the basketball stand to be measured in the middle of the rotating ring, starts the motor, and the motor drives the material barrel and the control box to rotate. The basketball can hit the basketball stand from multiple angles, thereby improving the diversity of the experimental data and better completing the testing operation of the basketball stand. The above-mentioned related technologies have the following defects: when the existing technology uses a basketball to apply impact testing to the basketball board, it is necessary to collect the basketball after the impact. However, in continuous impact, the used basketball is easily stuck at the collection port position of the collection structure, resulting in the inability to stably apply impact to the basketball board. Therefore, an impact resistance testing equipment for basketball boards is proposed, and a basketball board with detection is installed on the upper end of the basketball stand with detection, and then the basketball board is impact tested by a ball installed with a traction structure, so as to facilitate the collection of the basketball after the impact. Summary of the Invention

[0004] In order to stably and continuously impact a basketball board, the present invention provides an impact resistance testing device for a basketball board.

[0005] The present invention provides an impact resistance testing device for a basketball board, which adopts the following technical solution: it includes a test main frame and a basketball board to be tested, wherein a mounting structure for disassembling and fixing the basketball board is installed on the upper side of one end of the test main frame, a guide structure is provided on the upper side of the other end of the test main frame, an impact ball is provided on the upper side of the test main frame, the impact ball passes through the interior of the guide structure, and a traction structure for pulling the impact ball is installed on the side of the guide structure away from the mounting structure.

[0006] The test main frame is equipped with an angle control structure for controlling the angle of the guide structure. An impact structure for applying impact force to the impact ball is provided between the traction structure and the guide structure, and the impact structure is connected to the guide structure.

[0007] Optionally, the guide structure includes a retaining cylinder and a guide cylinder, the guide cylinder and the retaining cylinder are coaxially arranged, the impact ball is located inside the guide cylinder, and the retaining cylinder is connected to the traction structure.

[0008] Optionally, the impact structure includes an impact ring and an impact power telescopic rod, the impact power telescopic rod is fixed to the outer surface of the guide tube, the impact ring is located between the retaining tube and the guide tube, the impact ring and the guide tube are coaxially arranged, the outer diameter of the impact ring is smaller than the inner diameter of the guide tube, and the inner diameter of the impact ring is larger than the ball diameter of the impact ball.

[0009] Optionally, the angle control structure includes a vertical frame and a rotating frame, the lower end of the rotating frame is powered and rotatably plugged into the upper end of the vertical frame, the lower end of the vertical frame is fixed to the test main frame, the upper end of the rotating frame is in a right-angled U-shape, the guide cylinder is located inside the right-angled U-shape of the rotating frame, and the guide cylinder is connected to the rotating frame through power rotation.

[0010] Optionally, the traction structure includes a traction rope, a cavity end tube and a winding wheel. The retaining tube is installed in communication with the cavity end tube at one end away from the guide tube. Both ends of the winding wheel rotate and pass through the inner wall of the cavity end tube. A traction rope is passed through the inside of the retaining tube. One end of the traction rope is fixed to the impact ball. The traction rope is located inside the cavity end tube and is wound around and connected to the outer surface of the winding wheel at one end. A power control structure for controlling the forward and reverse bidirectional rotation of the winding wheel is installed on the outer surface of the cavity end tube.

[0011] Optionally, the power control structure includes a double-rod frame and a vertical frame, the lower end of the vertical frame is slidably sleeved on the outer surface of the double-rod frame, the vertical frame moves dynamically on the surface of the double-rod frame, and the double-rod frame is fixed to the outer surface of the cavity end tube.

[0012] A power shaft for power rotation is installed on the upper end of the vertical frame, and the power shaft drives the winding wheel to rotate through the transmission structure.

[0013] Optionally, the installation structure includes a cross plate frame, which is fixed to the test main frame and has four sliding grooves distributed in a cross shape.

[0014] A slider is slidably inserted in the sliding groove, and a threaded pressure rod is passed through the thread of the slider. The diameter of the threaded pressure rod close to the guide cylinder is larger than the diameter of the part engaged with the slider, and the basketball board is located between the four threaded pressure rods.

[0015] Optionally, the transmission structure includes a connecting plate, an inner gear ring and a center gear. The inner gear ring and the center gear are coaxially fixed on one side of the connecting plate. The connecting plate is fixed to the power shaft. The inner ring surface of the inner gear ring is meshed with a transmission gear. The distance difference between the inner diameter of the inner gear ring and the outer diameter of the center gear is greater than the outer diameter of the transmission gear.

[0016] The transmission gear is connected to one end of the winding wheel located outside the cavity end tube through a damping structure.

[0017] Optionally, the damping structure includes a damping inner wheel and multiple damping blocks, the damping inner wheel is located on the inner side of the transmission gear, the transmission gear is rotatably sleeved on the outer surface of the winding wheel, the damping inner wheel is coaxially fixedly sleeved on the outer surface of the winding wheel, the damping block is in damping contact with the damping inner wheel, the damping block is elastically connected to the inner ring surface of the transmission gear, the extension line of the damping block coincides with the axis of the winding wheel, and the multiple damping blocks are evenly distributed in a circular array around the axis of the damping inner wheel.

[0018] Optionally, a cavity ring frame is installed inside the guide cylinder, and the cavity ring frame is located at one end outside the guide cylinder and is connected to an air pump. The cavity ring frame consists of multiple ring structures and a strip structure, and the inner ring surface of each ring structure of the cavity ring frame is provided with multiple arc block structures.

[0019] The inner wall of the guide cylinder is provided with a plurality of arc grooves, and the plurality of arc block structures of the cavity ring frame are located inside the arc grooves in a one-to-one correspondence.

[0020] The arc groove is tilted away from the retaining cylinder. The inner ring surface of the arc block structure part of the cavity ring frame is provided with an air outlet connected to the interior. The air outlet is tilted from the side close to the axis of the guide cylinder to the side away from the retaining cylinder.

[0021] In summary, the present invention has the following beneficial technical effects:

[0022] 1. The present invention provides components such as an impact ball, a traction structure, and an impact structure. The impact structure applies an impact force to the impact ball, so that the impact ball is ejected from the guide structure and impacts the basketball board. Then, the traction structure pulls the impact ball ejected from the guide structure back into the guide structure, making it easier for the impact structure to impact the impact ball again, and the impact ball is ejected from the guide structure again, so that the impact ball can stably and continuously impact the basketball board.

[0023] 2. The present invention is provided with components such as an inner gear ring, a center gear, a transmission gear and a damping structure. The vertical frame slides on the surface of the double-rod frame to drive the inner gear ring and the center gear to reciprocate and engage with the center gear. The center gear drives the winding wheel to rotate back and forth through the damping structure, so that the winding wheel can respectively wind the traction rope and release the traction rope from the surface of the winding wheel. When winding the traction rope, the impact ball can be pulled into the guide cylinder. Before applying impact to the impact ball, the winding wheel is controlled to release the traction rope, so that the impact ball is impacted and ejected from the guide cylinder. When pulling the traction rope, the winding wheel will not generate resistance to the traction rope.

[0024] 3. The present invention provides a damping block and a damping inner wheel. The damping block is in damping contact with the outer ring surface of the damping inner wheel under elastic connection with the transmission gear. When the inner gear ring and the center gear are engaged with the transmission gear to drive the transmission gear to rotate, the transmission gear drives the damping inner wheel to rotate through the damping block. The damping inner wheel drives the winding wheel to wind around the traction rope. After the impact ball is pulled to contact the retaining cylinder, the transmission gear drives the damping block and the damping inner wheel to rotate relative to each other to prevent the traction rope from being torn off. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0026] Figure 2 This is a schematic structural diagram of the connection between the slider and the threaded pressure rod in an embodiment of the present invention;

[0027] Figure 3 is a schematic side view of part of the structure in an embodiment of the present invention;

[0028] Figure 4 2. It is a schematic structural diagram of the connection between the vertical frame and the rotating frame in an embodiment of the present invention;

[0029] Figure 5 2 is a schematic diagram of the structure of the connection between the impact ball and the traction rope in an embodiment of the present invention;

[0030] Figure 6 It is a schematic front view of part of the structure in an embodiment of the present invention;

[0031] Figure 7 This is a schematic structural diagram of the connection between the vertical frame and the double-rod frame in an embodiment of the present invention;

[0032] Figure 8 is a schematic rear view of part of the structure in an embodiment of the present invention;

[0033] Figure 9 In the embodiment of the present invention Figure 6 A magnified schematic diagram of the structure in the middle.

[0034] 1. Test main frame; 2. Impact ball; 3. Mounting structure; 31. Cross plate frame; 32. Slide groove; 33. Slider; 34. Threaded pressure rod; 4. Guide structure; 41. Stop cylinder; 42. Guide cylinder; 5. Traction structure; 51. Traction rope; 52. Cavity end cylinder; 53. Winding wheel; 54. Power control structure; 541. Double rod frame; 542. Vertical frame; 543. Power shaft; 544. Transmission structure; 5441. Connecting plate; 5442. Internal gear ring; 5443. Center gear; 5444. Transmission gear; 5445. Damping structure; 5446. Damping inner wheel; 5447. Damping block; 6. Angle control structure; 61. Vertical frame; 62. Rotating frame; 7. Impact structure; 71. Impact ring; 72. Impact power telescopic rod; 8. Cavity ring frame; 9. Arc groove; 10. Air outlet. DETAILED DESCRIPTION

[0035] The following is combined with Figures 1-9 The present invention is described in further detail.

[0036] The embodiment of the present invention discloses an impact resistance test device for a basketball board. Figures 1-9 As shown, it includes a test main frame 1 and a basketball board to be tested. A mounting structure 3 for disassembling and fixing the basketball board is installed on the upper side of one end of the test main frame 1, and a guide structure 4 is provided on the upper side of the other end of the test main frame 1. The guide structure 4 includes a blocking cylinder 41 and a guide cylinder 42. The guide cylinder 42 is coaxially arranged with the blocking cylinder 41.

[0037] The cam 33 is provided with a plurality of sliding grooves 32, each of which is provided with a plurality of sliding grooves 32, and a plurality of sliding grooves 32 are provided in the plurality of sliding grooves 32. The plurality of sliding grooves 32 are provided with a plurality of sliding grooves 32. The plurality of sliding grooves 32 are provided with a plurality of sliding grooves 32. The plurality of sliding grooves 32 are provided with a plurality of sliding grooves 32.

[0038] An impact ball 2 is provided on the upper side of the test main frame 1. The impact ball 2 passes through the inside of the guide structure 4. The impact ball 2 is located inside the guide cylinder 42. A traction structure 5 is installed on the side of the guide structure 4 away from the mounting structure 3, which plays a traction role on the impact ball 2. The traction structure 5 can pull the impact ball 2 into the guide cylinder 42. At the same time, when the impact ball 2 is ejected from the guide cylinder 42, the traction structure 5 can be pulled synchronously. The blocking cylinder 41 is connected to the traction structure 5, and the blocking cylinder 41 limits the minimum distance between the impact ball 2 and the traction structure 5.

[0039] The traction structure 5 includes a traction rope 51, a cavity end tube 52 and a winding wheel 53. The blocking tube 41 is connected to the cavity end tube 52 at one end away from the guide tube 42. Both ends of the winding wheel 53 rotate and pass through the inner wall of the cavity end tube 52. A traction rope 51 is passed through the blocking tube 41. One end of the traction rope 51 is fixed to the impact ball 2. The traction rope 51 is located inside the cavity end tube 52 and one end is wound around the outer surface of the winding wheel 53. A power control structure 54 for controlling the forward and reverse rotation of the winding wheel 53 is installed on the outer surface of the cavity end tube 52. The winding wheel 53 can wind and release the traction rope 51 during the forward and reverse rotation. When the winding wheel 53 winds the traction rope 51, the impact ball 2 can be pulled to move to the inside of the guide tube 42 to reset the impact ball 2. When the winding wheel 53 releases the traction rope 51, the released traction rope 51 can first fall into the cavity end tube 52.

[0040] The power control structure 54 includes a double-rod frame 541 , a vertical frame 542 , a power shaft 543 and a second motor.

[0041] The double rod frame 541 is fixed to the outer surface of the cavity end tube 52, and an axial slide rail is provided on the surface of its rod body; the lower end of the vertical frame 542 is slidably connected to the slide rail of the double rod frame 541 through a slider; the double rod frame 541 is installed with a power telescopic rod that drives the vertical frame 542 to move along the slide rail.

[0042] A bearing seat is provided at the upper end of the vertical frame 542, and the power shaft 543 is rotatably installed in the bearing seat; the second motor is fixed to the vertical frame 542, and its output shaft is directly connected to the power shaft 543 through a coupling; the power shaft 543 is separately engaged with the axle of the winding wheel 53 through the transmission structure 544.

[0043] When the power telescopic rod pushes the vertical frame 542 to the working position, the transmission structure 544 is engaged with the axle of the winding wheel 53, establishing a torque transmission path from the second motor to the winding wheel 53; based on the predetermined impact potential energy of the impact ball 2, it is converted into a predetermined release length of the traction rope 51; the second motor drives the power shaft 543 to rotate, and controls the winding wheel 53 to release the traction rope 51 of the predetermined release length through the transmission structure 544, so that the impact ball 2 drops to a predetermined height in the guide cylinder 42; when the power telescopic rod pulls the vertical frame 542 back to the disengaged position, the transmission structure 544 is separated from the axle of the winding wheel 53, releasing the rotation constraint on the winding wheel 53.

[0044] In the basketball board impact test equipment, the process of converting the predetermined impact potential energy PE of the impact ball 2 into the predetermined release length L of the traction rope 51 is an energy conversion calculation based on physical principles. Impact potential energy refers to the kinetic energy of the impact ball 2's initial velocity, remaining after deceleration due to resistance from the air, guide tube 42, and traction rope 51. This energy is used to simulate the impact on the basketball board. The release length of the traction rope 51 directly corresponds to the distance the impact ball 2 travels out of the guide tube 42.

[0045] When specifically applied, this includes:

[0046] The powered telescopic rod (hydraulic cylinder / electric push rod) extends, pushing the vertical frame 542 to slide along the axial slide rail of the double-rod frame 541 toward the working position; the slider at the lower end of the vertical frame 542 and the slide rail adopt a clearance fit (fit tolerance H7 / g6) to ensure that the sliding resistance is controllable; a hard limit block is set at the end of the slide rail to mechanically lock the working position of the vertical frame 542.

[0047] Rigid meshing process:

[0048] When the vertical frame 542 reaches the working position, the active bevel gear of the transmission structure 544 is axially abutted against the driven bevel gear of the winding wheel 53 axle. Relying on the continuous thrust of the power telescopic rod, the tooth surfaces of the two gears are forced to press together. The wheel module is ≥2, and the tooth surface is carburized and hardened HRC ≥58 to ensure non-slip engagement. The servo motor with an encoder of the second motor receives the pulse command; the power shaft 543 is driven to rotate through the coupling, and the winding wheel 53 is driven through the transmission bevel gear; the winding wheel accurately releases the traction rope 51 of the calculated length L, with an error of ≤±1.5mm.

[0049] An infrared distance measuring sensor is installed on the inner wall of the guide tube 42 to provide real-time feedback of the impact ball height H, verifying the formula: H=L×sin(pitch angle); automatic compensation is performed when the deviation is exceeded, and the second motor fine-tunes the pulse by 0.5 turns.

[0050] The power telescopic rod retracts, exerting a reverse pulling force to drag the vertical frame 542 back to the disengaged position.

[0051] The transmission structure 544 includes a connecting plate 5441, an inner gear ring 5442 and a central gear 5443. The inner gear ring 5442 and the central gear 5443 are coaxially fixed to one side of the connecting plate 5441. The connecting plate 5441 is fixed to the power shaft 543. The inner ring surface of the inner gear ring 5442 is meshed with a transmission gear 5444. The difference in distance between the inner diameter of the inner gear ring 5442 and the outer diameter of the central gear 5443 is greater than the outer diameter of the transmission gear 5444. The transmission gear 5444 is connected to the damping structure 5441. 45 is connected to the winding wheel 53 at one end outside the cavity end tube 52. The winding wheel 53 winds the traction rope 51 and releases the traction rope 51 from the surface of the winding wheel 53 during forward and reverse rotation. When the traction rope 51 is wound, the impact ball 2 can be pulled into the guide tube 42. Before the impact is applied to the impact ball 2, the winding wheel 53 is controlled to release the traction rope 51, so that the impact ball 2 is impacted and ejected from the guide tube 42. When the traction rope 51 is pulled, the winding wheel 53 will not generate resistance to the traction rope 51.

[0052] The test main frame 1 is installed with an angle control structure 6 for controlling the angle of the guide structure 4 , an impact structure 7 for applying impact force to the impact ball 2 is provided between the traction structure 5 and the guide structure 4 , and the impact structure 7 is connected to the guide structure 4 .

[0053] The vertical frame 542 slider moves backward in a straight line, the bevel gear has a self-separating characteristic (30° cone angle design), the winding wheel 53 switches to a free state (the wheel axle contains a needle clutch, which only allows one-way release), and the traction rope 51 is in a tension-free hanging state. After detecting the vertical frame 542 returning to its position signal, a trigger command is sent to the impact structure 7.

[0054] The angle control structure 6 includes a stand 61 , a rotating frame 62 and a first motor.

[0055] The lower end of the stand 61 is fixed to the test main frame 1, and a rotating sleeve with axial constraint is provided at its upper end; the lower end of the rotating frame 62 is rotatably inserted into the rotating sleeve through a bearing; the first motor is fixedly installed on the side wall of the stand 61, and its output shaft engages with the gear ring at the lower end of the rotating frame 62 through a gear set.

[0056] The upper end of the rotating frame 62 is constructed as a right-angled U-shaped bracket with an opening facing the basketball board; the guide cylinder 42 is rotatably installed between the side walls of the right-angled U-shaped bracket through a horizontal rotating shaft.

[0057] When the first motor drives the rotating frame 62 to rotate around the vertical axis of the stand 61 to a first predetermined angle, it synchronously drives the guide cylinder 42 to deflect in the horizontal plane; when the guide cylinder 42 rotates around the horizontal axis to a second predetermined angle, its axis is adjusted to pitch in the vertical plane; the combined movement of horizontal plane deflection and vertical plane pitching makes the launch axis of the guide cylinder 42 accurately point to the impact point of the basketball board.

[0058] The stand 61 is rigidly fixed to the specified position of the test main frame 1 by bolts, and the rotating sleeve on its top has a built-in angular contact bearing; the rotating sleeve is inserted into the lower end of the rotating frame 62, and 360° rotation freedom around the Z axis is achieved through the bearing; the first motor is installed on the side wall of the stand 61 through a flange, and its output gear has a precise meshing module ≥2 with the gear ring at the bottom of the rotating frame 62, and the meshing clearance is ≤0.1mm.

[0059] Horizontal deflection execution, linkage process:

[0060] The first motor receives a horizontal rotation instruction of the first predetermined angle θ, driving the output gear to rotate; the gear-gear ring transmission pair transmits the torque to the rotating frame 62, driving it to rotate around the Z axis of the vertical frame 61; the right-angle U-shaped bracket of the rotating frame 62 deflects synchronously, so that the guide cylinder 42 completes the θ angle positioning accuracy in the horizontal plane with ±0.5°.

[0061] Pitch adjustment mechanism linkage, structural configuration:

[0062] Both ends of the guide cylinder 42 are installed on the side walls of the U-shaped bracket through sealed spherical roller bearings. The horizontal rotating shaft passes through the center of mass of the guide cylinder 42, and one end thereof extends to the outside of the U-shaped bracket and is fixed to the worm gear. The pitch motor is installed on the outside of the U-shaped bracket, and its output shaft worm and worm gear form a self-locking transmission pair (transmission ratio 30:1).

[0063] The pitch motor receives the vertical plane angle command (second predetermined angle φ), drives the worm to rotate, and the worm pushes the worm wheel, driving the horizontal rotating shaft to rotate the guide cylinder 42 around its own axis; the guide cylinder 42 is completed in the vertical plane (φ angle pitch positioning range -15° to +60°, accuracy ±0.3°); the horizontal θ angle of the rotating frame 62 and the pitch φ angle of the guide cylinder 42 are combined to form a space vector direction, which is verified by the laser transmitter installed at the exit of the guide cylinder 42. The laser spot is projected to the target impact point of the basketball board. When the position deviation is greater than 3mm, the θ / φ angle compensation fine-tuning is triggered (step resolution 0.1°).

[0064] When used in a specific application, the specific implementation process of the angle control structure 6 and the impact structure 7 is as follows:

[0065] Fixing of stand 61 and test main frame:

[0066] The lower end of the stand 61 is fixed to the upper crossbeam of the test main frame 1 by a bolt group to ensure vertical installation. A circular mounting groove is provided at its upper end, and a deep groove ball bearing is embedded in the groove to support the rotating axis of the rotating frame 62.

[0067] Power rotation connection of the rotating frame 62:

[0068] A cylindrical rotating shaft is processed at the lower end of the rotating frame 62 and inserted into the inner ring of the bearing at the upper end of the vertical frame 61; a first motor is installed on the side of the vertical frame 61. The first motor is a servo motor (such as Panasonic MINASA6 series). The output shaft of the first motor is connected to the rotating shaft of the rotating frame 62 through a synchronous pulley (tooth ratio 1:1) to ensure rotation accuracy (error ≤ 0.5°).

[0069] Pitch connection between guide cylinder 42 and rotating frame 62:

[0070] The upper end of the rotating frame 62 is in a right-angled U shape, and a pair of thrust ball bearings (such as type 51105) are installed on the inner sides of the two vertical arms. The middle section of the guide cylinder 42 passes through the inner ring of the bearing to achieve pitch rotation.

[0071] Another servo motor is fixed on the horizontal arm of the rotating frame 62, which drives the rotating shaft of the guide cylinder 42 through a bevel gear set (module 2, transmission ratio 1:1) to achieve pitch angle adjustment from -45° to +45°.

[0072] Dual-axis angle adjustment process:

[0073] Horizontal angle adjustment: The PLC controller (such as Siemens S7-200) receives the angle command, drives the first motor on the stand 61 to rotate forward and reverse, and feeds back the real-time angle (resolution 0.1°) through the encoder. When the set value is reached, the motor brake is locked.

[0074] Pitch angle adjustment: Similarly, the first motor adjusts the pitch angle of the guide tube 42 according to the instruction, and the angle position is monitored in real time through the potentiometer.

[0075] Linkage control design:

[0076] The angle control structure 6 is linked to the mounting structure 3: when the angle of the guide cylinder 42 is adjusted, the PLC automatically calculates the required offset of the basketball board and fine-tunes the position of the basketball board through the slider 33 of the mounting structure 3 to ensure that the impact point is always in the preset area.

[0077] Installation of impact power telescopic rod 72:

[0078] The impact power telescopic rod 72 uses an electric cylinder (such as a stroke of 100mm and a thrust of 500N). The cylinder body is fixed to the outer surface of the guide cylinder 42 by bolts through an L-shaped bracket, and the axis of the telescopic rod coincides with the axis of the guide cylinder 42. An impact ring 71 is installed at the front end of the electric cylinder, and a buffer rubber pad (Shore hardness 60A) is set at the connection to reduce rigid collision during impact.

[0079] Structural design of impact ring 71:

[0080] The impact ring 71 is made of quenched 45# steel (hardness HRC45-50). Its inner diameter is 2mm smaller than that of the impact ball 2 (for example, if the ball diameter is 100mm, the ring inner diameter is 98mm), and its outer diameter is 1mm smaller than that of the guide tube 42 (for example, if the tube inner diameter is 120mm, the ring outer diameter is 119mm), ensuring a clearance fit (tolerance H7 / g6). A 15° chamfer is machined on the inside of the impact ring 71 to guide the impact ball 2 to receive force smoothly and avoid eccentric impact.

[0081] Impact force output control:

[0082] The electric cylinder is driven by a servo driver (such as the Leisai SD300), and the impact speed can be set (adjustable from 0.5 to 5 m / s). The impact force can be adjusted by changing the motor speed (300 to 3000 rpm) (formula: F=ma, m is the mass of the impact ball, and a is the acceleration).

[0083] Impact trigger mode: After the photoelectric sensor (installed at the entrance of the guide cylinder 42) detects that the impact ball 2 is reset, it sends a signal to the PLC to trigger the electric cylinder to extend quickly (response time ≤ 50ms).

[0084] Security protection mechanism:

[0085] A limit switch is set at the end of the electric cylinder stroke. When the impact ring 71 reaches the maximum extension position, the power is automatically cut off to prevent overload. The inner wall of the guide cylinder 42 is sprayed with Teflon coating (thickness 50μm) to reduce the friction resistance between the impact ring 71 and the cylinder wall and extend the service life.

[0086] Oblique impact test scenario:

[0087] The angle control structure 6 adjusts the guide tube 42 to a horizontal angle of 30° and a pitch angle of -15°, causing the impact ball 2 to strike the upper left corner of the basketball board at a downward angle of 30°. The electric cylinder of the impact structure 7 pushes the impact ring 71 at a speed of 3 m / s, causing the impact ball 2 to obtain an impulse of approximately 20 N·s, thus testing the impact resistance of the basketball board edge.

[0088] After completing an impact, the angle control structure 6 adjusts the guide cylinder 42 to the next angle (such as 90° horizontally and 0° in pitch) within 0.5s. At the same time, the traction structure 5 recovers the impact ball 2, and the impact structure 7 waits for the next trigger to achieve multi-angle continuous testing (switching frequency ≤ 1 time / 10s).

[0089] The impact structure 7 includes an impact ring 71 and an impact power telescopic rod 72. The impact power telescopic rod 72 is fixed to the outer surface of the guide tube 42. The impact ring 71 is located between the retaining tube 41 and the guide tube 42. The impact ring 71 and the guide tube 42 are coaxially arranged. The outer diameter of the impact ring 71 is smaller than the inner diameter of the guide tube 42, and the inner diameter of the impact ring 71 is larger than the ball diameter of the impact ball 2, so that the impact ring 71 can enter the guide tube 42. The impact ring 71 can apply sufficient thrust to the impact ball 2. The impact power telescopic rod 72 can drive the impact ring 71 to quickly apply thrust to the contacted impact ball 2, so that the impact ball 2 can be ejected from the guide tube 42.

[0090] The guide cylinder 42 is internally plugged with a cavity ring frame 8, and one end of the cavity ring frame 8 located outside the guide cylinder 42 is connected to an air pump. The air pump fills the cavity ring frame 8 with airflow. When the impact ball 2 is ejected from the guide cylinder 42, the air pump is started. When the impact ball 2 is pulled into the guide cylinder 42, the air pump is stopped to prevent the airflow from exerting resistance on the retraction of the impact ball 2. The cavity ring frame 8 is composed of multiple annular structures and a strip structure. The inner annular surface of each annular structure of the cavity ring frame 8 is provided with multiple arc block structures.

[0091] The inner wall of the guide cylinder 42 is provided with a plurality of arc grooves 9, and the plurality of arc block structures of the cavity ring frame 8 are located inside the arc grooves 9 in a one-to-one correspondence;

[0092] The arc groove 9 is arranged to be inclined away from one end of the baffle cylinder 41, guiding the direction of the airflow. The arc groove 9 is located at the inner ring side of the cavity ring frame 8 and an annular ring plate structure is provided. A gap is formed between the ring plate structure of the cavity ring frame 8 and the arc groove 9 away from the baffle cylinder 41, so that the airflow is ejected from the gap formed by the ring plate structure and the arc groove 9 away from one end of the baffle cylinder 41, so that the airflow has the function of flowing toward the end of the guide cylinder 42 away from the baffle cylinder 41. The inner annular surface of the arc block structure part of the cavity ring frame 8 is provided with an air outlet 10 connected to the interior, and the air outlet 10 is inclined toward the side away from the baffle cylinder 41 near the axis of the guide cylinder 42. The airflow filled in the cavity ring frame 8 is ejected from the inclined air outlet 10, and the ejected airflow assists in pushing the impact ball 2 to be ejected from the guide cylinder 42. At the same time, the inclined ejected airflow forms an air gap between the impact ball 2 and the guide cylinder 42, reducing the friction between the impact ball 2 and the guide cylinder 42.

[0093] The damping structure 5445 includes a damping inner wheel 5446 and a plurality of damping blocks 5447. The damping inner wheel 5446 is located inside the transmission gear 5444. The transmission gear 5444 is rotatably sleeved on the outer surface of the winding wheel 53. The damping inner wheel 5446 is coaxially fixedly sleeved on the outer surface of the winding wheel 53. The damping blocks 5447 are in damping contact with the damping inner wheel 5446. The damping blocks 5447 are elastically connected to the inner ring surface of the transmission gear 5444. The elastic connection can be a spring or an elastic telescopic rod. The damping blocks 5447 are elastically connected to the damping inner wheel 5446 under the elastic connection with the transmission gear 5444. The outer ring surface is in damping contact, and the extension line of the damping block 5447 coincides with the axis of the winding wheel 53. Multiple damping blocks 5447 are evenly distributed in a circular array around the axis of the damping inner wheel 5446. There is resistance between the contact surface between the damping block 5447 and the damping inner wheel 5446. When the transmission gear 5444 rotates, the damping block 5447 drives the damping inner wheel 5446 to rotate through the resistance with the damping inner wheel 5446. After pulling the impact ball 2 to contact the retaining cylinder 41, the transmission gear 5444 drives the damping block 5447 and the damping inner wheel 5446 to rotate relative to each other to prevent the traction rope 51 from being torn off.

[0094] The working principle is as follows: place the basketball board in the center of the cross board frame 31, and the sliders 33 in the four cross-distributed slide grooves 32 can slide along the slide grooves 32. Adjust the position of the sliders 33 according to the test requirements to keep the basketball board and the guide tube 42 at a preset distance (for example, different impact distances simulate different forces).

[0095] The threaded pressure rod 34 is rotated, and its large diameter end gradually approaches the surface of the basketball board. Through the synchronous squeezing of the four threaded pressure rods 34, the basketball board is tightly fixed on the cross plate frame 31 to ensure that there is no displacement during the test.

[0096] Positioning of the guide structure 4:

[0097] The guide cylinder 42 is coaxially arranged with the retaining cylinder 41 and is installed at the other end of the test main frame 1 , with its axis forming an initial impact angle with the surface of the basketball board (vertical when not adjusted).

[0098] The workflow of traction structure 5:

[0099] Winding of the traction rope 51: The power telescopic rod (such as a hydraulic cylinder) in the power control structure 54 drives the vertical frame 542 to move upward, driving the power shaft 543 to rotate forward through the transmission structure 544 (inner gear ring 5442, center gear 5443, transmission gear 5444) to make the winding wheel 53 rotate forward, and the traction rope 51 is wound around the outer surface of the winding wheel 53, pulling the impact ball 2 to move inward along the guide cylinder 42 until the impact ball 2 abuts against the inner wall of the blocking cylinder 41 (the blocking cylinder 41 limits its minimum displacement).

[0100] Damping protection: When the impact ball 2 reaches the limit position, if the traction continues, the damping block 5447 and the damping inner wheel 5446 in the damping structure 5445 will slip due to friction, preventing the traction rope 51 from being overloaded and broken.

[0101] Reset and standby state:

[0102] After the impact ball 2 is reset, it is located inside the guide tube 42 and waits for the impact structure 7 to apply power.

[0103] Triggering mechanism of shock structure 7:

[0104] The impact power telescopic rod 72 (such as an electric telescopic rod) is quickly extended to push the impact ring 71 to move inward along the axis of the guide tube 42. The inner diameter of the impact ring 71 is larger than the diameter of the impact ball 2, and the outer diameter is smaller than the inner diameter of the guide tube 42, so it can smoothly enter the tube.

[0105] The impact ring 71 impacts the impact ball 2, and instantly applies thrust, so that the impact ball 2 is ejected from the guide tube 42 at a set speed and hits the surface of the basketball board in a straight line.

[0106] Impact force transmission and effect:

[0107] The kinetic energy of the impact ball 2 directly acts on the basketball board to test its anti-deformation and anti-fracture performance under impact force.

[0108] Secondary action of traction structure 5:

[0109] After the impact ball 2 is ejected from the guide cylinder 42 , the winding wheel 53 of the traction structure 5 rotates forward again under the drive of the power control structure 54 , rewinds the traction rope 51 , and pulls the impact ball 2 back into the guide cylinder 42 from the direction of the basketball board.

[0110] At this time, when the traction rope 51 is in a relaxed state, the impact structure 7 can be reset again (the impact power telescopic rod 72 is retracted, and the impact ring 71 returns to the initial position) to prepare for the next impact.

[0111] Continuous impact realization:

[0112] Through the cycle of "impact-recovery-re-impact", continuous impact testing of the basketball board can be achieved without human intervention, thereby improving experimental efficiency.

[0113] Biaxial adjustment of angle control structure 6:

[0114] Horizontal angle adjustment: The motor in the stand 61 drives the rotating frame 62 to rotate horizontally, driving the guide tube 42 to rotate in the horizontal plane (such as 0°~180°), thereby changing the horizontal incident direction of the impact ball 2.

[0115] Vertical angle adjustment: In the U-shaped structure at the upper end of the rotating frame 62, the guide cylinder 42 is driven by another motor to pitch and rotate (e.g., -45° to +45°) to adjust the vertical incident angle of the impact ball 2.

[0116] The significance of multi-angle impact:

[0117] Through dual-axis adjustment, the impact ball 2 can hit the basketball board at any angle (such as oblique, directly above, sideways, etc.), simulating the impact force of a basketball at different incident angles in actual use and comprehensively testing the impact resistance of the basketball board in all directions.

[0118] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An impact resistance test device for a basketball board, comprising a test main frame (1) and a basketball board to be tested, characterized in that: A mounting structure (3) for disassembling and fixing the basketball board is installed on the upper side of one end of the test main frame (1), a guide structure (4) is provided on the upper side of the other end of the test main frame (1), an impact ball (2) is provided on the upper side of the test main frame (1), the impact ball (2) passes through the inside of the guide structure (4), and a traction structure (5) for traction of the impact ball (2) is installed on the side of the guide structure (4) away from the mounting structure (3); The test main frame (1) is equipped with an angle control structure (6) for controlling the angle of the guide structure (4); an impact structure (7) for applying an impact force to the impact ball (2) is provided between the traction structure (5) and the guide structure (4); the impact structure (7) is connected to the guide structure (4); the guide structure (4) includes a retaining cylinder (41) and a guide cylinder (42); the guide cylinder (42) and the retaining cylinder (41) are coaxially arranged; the impact ball (2) is located inside the guide cylinder (42); the retaining cylinder (41) is connected to the traction structure (5); the traction structure (5) includes a traction rope (51) ), a cavity end tube (52) and a winding wheel (53), one end of the retaining tube (41) away from the guide tube (42) is connected to the cavity end tube (52) and installed, and both ends of the winding wheel (53) rotate and penetrate the inner wall of the cavity end tube (52), a traction rope (51) is passed through the interior of the retaining tube (41), one end of the traction rope (51) is fixed to the impact ball (2), and one end of the traction rope (51) is located inside the cavity end tube (52) and is wound and connected to the outer surface of the winding wheel (53), and a power control structure (54) for controlling the forward and reverse bidirectional rotation of the winding wheel (53) is installed on the outer surface of the cavity end tube (52).

2. The impact resistance testing device for a basketball board according to claim 1, characterized in that: The impact structure (7) comprises an impact ring (71) and an impact power telescopic rod (72), the impact power telescopic rod (72) being fixed to the outer surface of the guide cylinder (42), the impact ring (71) being located between the retaining cylinder (41) and the guide cylinder (42), the impact ring (71) being coaxially arranged with the guide cylinder (42), the outer diameter of the impact ring (71) being smaller than the inner diameter of the guide cylinder (42), and the inner diameter of the impact ring (71) being larger than the ball diameter of the impact ball (2).

3. The impact resistance testing device for a basketball board according to claim 2, characterized in that: The angle control structure (6) comprises a stand (61), a rotating frame (62) and a first motor; The lower end of the stand (61) is fixed to the test main frame (1), and the upper end is provided with a rotating sleeve with axial constraint; the lower end of the rotating frame (62) is rotatably inserted into the rotating sleeve through a bearing; the first motor is fixedly installed on the side wall of the stand (61), and its output shaft engages with the gear ring at the lower end of the rotating frame (62) through a gear set; The upper end of the rotating frame (62) is constructed as a right-angled U-shaped bracket with an opening facing the basketball board; the guide cylinder (42) is rotatably mounted between the side walls of the right-angled U-shaped bracket via a horizontal rotating shaft; When the first motor drives the rotating frame (62) to rotate around the vertical axis of the stand (61) to a first predetermined angle, the guide cylinder (42) is synchronously driven to deflect in the horizontal plane; when the guide cylinder (42) rotates around the horizontal axis to a second predetermined angle, the axis thereof is pitched in the vertical plane; the combined movement of the horizontal plane deflection and the vertical plane pitching causes the launch axis of the guide cylinder (42) to accurately point to the impact point of the basketball board.

4. The impact resistance testing device for a basketball board according to claim 3, characterized in that: The power control structure (54) includes a double-rod frame (541), a vertical frame (542), a power shaft (543) and a second motor; The double-rod frame (541) is fixed to the outer surface of the cavity end tube (52), and an axial slide rail is provided on the surface of the rod body; the lower end of the vertical frame (542) is slidably sleeved on the slide rail of the double-rod frame (541) through a slider; the double-rod frame (541) is equipped with a power telescopic rod that drives the vertical frame (542) to move along the slide rail; A bearing seat is provided at the upper end of the vertical frame (542), and the power shaft (543) is rotatably mounted in the bearing seat; the second motor is fixed to the vertical frame (542), and its output shaft is directly connected to the power shaft (543) via a coupling; the power shaft (543) is in separate meshing engagement with the axle of the winding wheel (53) via a transmission structure (544); When the power telescopic rod pushes the vertical frame (542) to the working position, the transmission structure (544) is engaged with the axle of the winding wheel (53), and a torque transmission path from the second motor to the winding wheel (53) is established; based on the predetermined impact potential energy of the impact ball (2), it is converted into a predetermined release length of the traction rope (51); the second motor drives the power shaft (543) to rotate, and the transmission structure (544) controls the winding wheel (53) to release the traction rope (51) of the predetermined release length, so that the impact ball (2) descends to a predetermined height in the guide cylinder (42); when the power telescopic rod pulls the vertical frame (542) back to the disengaged position, the transmission structure (544) is separated from the axle of the winding wheel (53), and the rotation constraint on the winding wheel (53) is released.

5. The impact resistance testing device for a basketball board according to claim 4, characterized in that: The mounting structure (3) includes a cross plate frame (31), the cross plate frame (31) is fixed to the test main frame (1), and the cross plate frame (31) is provided with four slide slots (32) distributed in a cross shape; A slider (33) is slidably inserted into the interior of the slide groove (32), and a threaded pressure rod (34) is threadedly passed through the slider (33). The diameter of the threaded pressure rod (34) at one end close to the guide cylinder (42) is larger than the diameter of the portion engaging with the slider (33), and the basketball board is located between the four threaded pressure rods (34).

6. The impact resistance testing device for a basketball board according to claim 5, characterized in that: The transmission structure (544) includes a connecting plate (5441), an inner gear ring (5442), and a center gear (5443). The inner gear ring (5442) and the center gear (5443) are coaxially fixed to one side of the connecting plate (5441). The connecting plate (5441) is fixed to the power shaft (543). The inner ring surface of the inner gear ring (5442) is meshed with a transmission gear (5444). The distance difference between the inner diameter of the inner gear ring (5442) and the outer diameter of the center gear (5443) is greater than the outer diameter of the transmission gear (5444). The transmission gear (5444) is connected to one end of the winding wheel (53) located outside the cavity end tube (52) via a damping structure (5445).

7. The impact resistance testing device for a basketball board according to claim 6, characterized in that: The damping structure (5445) includes a damping inner wheel (5446) and a plurality of damping blocks (5447), wherein the damping inner wheel (5446) is located inside the transmission gear (5444), the transmission gear (5444) is rotatably sleeved on the outer surface of the winding wheel (53), the damping inner wheel (5446) is coaxially fixedly sleeved on the outer surface of the winding wheel (53), the damping blocks (5447) are in damping contact with the damping inner wheel (5446), and the damping blocks (5447) are elastically connected to the inner annular surface of the transmission gear (5444); The extension line of the damping block (5447) coincides with the axis of the winding wheel (53), and the plurality of damping blocks (5447) are evenly distributed in a circular array around the axis of the damping inner wheel (5446).

8. The impact resistance testing device for a basketball board according to claim 7, characterized in that: The guide cylinder (42) is internally plugged with a cavity ring frame (8), and one end of the cavity ring frame (8) is located outside the guide cylinder (42) and is connected to an air pump. The cavity ring frame (8) is composed of a plurality of annular structures and a strip structure, and the inner ring surface of each annular structure of the cavity ring frame (8) is provided with a plurality of arc block structures. The inner wall of the guide cylinder (42) is provided with a plurality of arc grooves (9), and the plurality of arc block structures of the cavity ring frame (8) are located inside the arc grooves (9) in a one-to-one correspondence; The arc groove (9) is arranged at an angle away from the retaining cylinder (41), and the inner ring surface of the arc block structure portion of the cavity ring frame (8) is provided with an air outlet (10) connected to the interior, and the air outlet (10) is inclined toward the side away from the retaining cylinder (41) on the side close to the axis of the guide cylinder (42).

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