A drop test device and method, storage medium, and control system

Abstract

The present application is applied to the technical field of test equipment, and discloses a drop test equipment and method, storage medium, and control system. The drop test equipment includes: an object acceleration control unit configured to drive the object to be tested to accelerate along a first direction according to a target acceleration; an object angle conversion control unit configured to receive the object to be tested that has completed the accelerated motion, and convert its motion direction to a second direction, and drop it in a free fall accelerated motion; an object speed and angle monitoring unit configured to monitor the drop angle and drop speed of the object to be tested when it falls. During the drop test process, no fixture contacts the object to be tested, thereby achieving interference-free and high-precision directional drop control; the object to be tested performs free fall motion with an initial velocity, so that the drop speed will not be restricted by height, meeting the requirements of accelerated drop testing. In this way, the drop test equipment can achieve high-precision directional accelerated drop testing and improve the accuracy of drop test results.

Description

Technical Field

[0001] The present application relates to the technical field of test equipment, and in particular to a drop test equipment and method, a storage medium, and a control system. Background Art

[0002] As consumers' requirements for electronic equipment quality continue to increase, manufacturers need to conduct more stringent product quality control. As an important testing equipment, the drop tester can simulate the drop of electronic equipment during transportation, handling or daily use, and evaluate the impact resistance of electronic equipment in a specific direction by controlling the height, direction and angle of the drop.

[0003] The traditional drop machine relies on a clamp to hold the object to be dropped (such as the electronic device to be tested). After it is raised to the target height, the clamp is released, allowing the object to fall by its own gravity. However, when the clamp is released at the end of the drop, the force on the object to be tested will change, causing the drop posture to change, making it difficult for the drop angle to meet the drop requirements; and if the drop height is not enough, the final drop speed will also not meet the drop requirements. It can be seen that the existing drop test method cannot meet the drop requirements, which can easily lead to inaccurate drop test results. Summary of the invention

[0004] The present application provides a drop test device and method, a storage medium, and a control system to solve the problem that existing drop test methods easily lead to inaccurate drop test results.

[0005] In a first aspect, the present application provides a drop test device, including: an object acceleration control unit, an object angle conversion control unit, and an object speed and angle monitoring unit. The object acceleration control unit is configured to drive the object to be tested to accelerate along a first direction according to a target acceleration; the object angle conversion control unit is configured to receive the object to be tested that has completed the accelerated motion, and to convert the motion direction of the object to be tested to a second direction, so that the object to be tested accelerates and falls in a free fall along the second direction; the second direction is perpendicular to the first direction; the object speed and angle monitoring unit is configured to monitor the falling angle and falling speed of the object to be tested when it falls.

[0006] The drop test equipment provided in the embodiment of the present application utilizes an object acceleration control unit to implement an accelerated drop test of the object to be tested; utilizes an object angle conversion control unit to change the direction of motion of the object to be tested to implement a directional drop test; utilizes an object speed and angle monitoring unit to monitor the drop angle and drop speed of the object to be tested. During the drop test process, no fixture contacts the object to be tested to avoid posture changes during free fall, and the posture is accurately controlled after the accelerated drop, achieving interference-free, high-precision directional drop control; the object to be tested performs free fall with an initial velocity to achieve accelerated free fall, and the height of the drop test equipment is small, so that the drop speed will not be limited by the height, and the drop speed far exceeds the object's own falling speed, meeting the requirements of the accelerated drop test. In this way, the drop test equipment provided in the embodiment of the present application can achieve high-precision directional accelerated drop tests and improve the accuracy of the drop test results.

[0007] In some implementations, the object acceleration control unit includes: a loading platform and an acceleration device. The loading platform is used to carry the object to be tested; the acceleration device is connected to the loading platform, and the acceleration device is configured to drive the loading platform to accelerate along a first direction according to a target acceleration, so as to drive the object to be tested to accelerate along the first direction according to the target acceleration. In this way, the acceleration device and the loading platform can be used to accelerate the object to be tested, so as to ensure that the falling speed during the subsequent fall meets the drop test requirements.

[0008] In some implementations, the loading platform includes: a baffle and a disengagement port, the baffle and the disengagement port are located at opposite ends of the loading platform along a first direction; the baffle is away from the movement direction of the object to be tested, and the baffle is used to hold the object to be tested when the loading platform is accelerating, so as to keep the object to be tested and the loading platform relatively still during the acceleration; the disengagement port faces the movement direction of the object to be tested, and the disengagement port is used to allow the object to be tested to disengage from the loading platform after the acceleration is completed. In this way, it is convenient to prevent the object to be tested from disengaging from the loading platform under the action of inertia during the acceleration, thereby affecting the test process; it is also convenient for the object to be tested to continue to move forward after disengaging from the loading platform through the disengagement port.

[0009] In some implementations, the acceleration device includes a linear magnetic track and a mover; the mover is slidably connected to the linear magnetic track, and the length direction of the linear magnetic track is parallel to the first direction; the object platform is slidably connected to the linear magnetic track through a slider; the mover is configured to drive the slider to slide along the linear magnetic track at a target acceleration, so as to drive the object platform to move along the first direction at a target acceleration. In this way, the object to be tested can be subjected to an accelerated drop test at the maximum speed to ensure that the subsequent drop speed during the drop meets the test requirements.

[0010] In some implementations, the object angle conversion control unit includes: a circular turning track; the circular turning track includes a break, and a starting end and an end end located at both ends of the break, the starting end is connected to the linear magnetic track, the end end is closer to the loading platform relative to the starting end, and is located on the same side of the linear magnetic track as the loading platform; the object to be tested that has separated from the loading platform falls into the circular turning track and moves in a circle from the starting end to the end end, and the object to be tested performs free fall acceleration along the second direction at the end end. In this way, the circular turning track can provide a circular motion path to change the motion direction and motion speed of the object to be tested, so that the final falling speed meets the requirements of the accelerated drop test.

[0011] In some implementations, the circular turning track is a three-quarter circular structure; the tangent direction of the circular turning track at the starting end is parallel to the first direction, and the tangent direction at the terminal end is parallel to the second direction. In this way, it can be ensured that the object to be tested can fall into the circular turning track along the first direction and perform circular motion after leaving the loading platform, and the direction of the free fall acceleration motion of the object to be tested at the terminal end is along the vertical direction.

[0012] In some implementations, the radius of the circular turning track , satisfying the following relationship: , ; In the formula, is the acceleration due to gravity, is the final velocity of the object to be tested when it reaches the starting end, is the target acceleration, is the acceleration displacement corresponding to the accelerated motion. In this way, it can be ensured that the object to be tested will not fall when it moves to the highest point.

[0013] In some implementations, the apparatus further includes: a bracket and a drop plate; the drop plate is fixed to the bracket, and the bracket is located on one side of the terminal end, so that the drop plate is disposed between the linear magnetic track and the terminal end; the drop plate is used to receive the object to be tested that is subjected to free fall acceleration from the terminal end, so as to perform a drop test. In this way, it is possible to prevent the bracket and the drop plate from obstructing the movement of the loading platform relative to the linear magnetic track, and the drop plate can be disposed between the linear magnetic track and the terminal end to ensure the normal conduct of the drop test.

[0014] In some implementations, the object speed and angle monitoring unit includes: a high-speed camera and a base; the base is located on the side of the loading platform away from the circular turning track, and the high-speed camera is fixed on the base; the lens of the high-speed camera faces the drop plate, and the high-speed camera is configured to take a picture of the object to be tested falling on the drop plate. In this way, the drop angle and drop speed of the object to be tested can be determined based on the picture taken by the high-speed camera.

[0015] In some implementations, it also includes: a general control unit, which is connected to the acceleration device and the high-speed camera respectively; the general control unit is configured to control the acceleration device to drive the loading platform to accelerate along the first direction according to the target acceleration; the general control unit is also configured to control the high-speed camera to take a picture of the object to be tested falling onto the drop plate according to the shooting frame rate, and determine the drop angle and drop speed of the object to be tested according to the picture. In this way, the directional acceleration drop test process can be controlled with high precision to improve the accuracy of the drop test results.

[0016] In some implementations, the drop velocity is determined according to the following formula: : ; In the formula, is the frame rate of the high-speed camera, The value range is 1000 frames / second to 10000 frames / second; It is the drop displacement of the object to be tested in the two pictures at the same position before the drop. In this way, the drop speed will not be limited by the height of the drop test equipment, meeting the requirements of accelerated drop test.

[0017] In the second aspect, the present application provides a drop test method, which is applied to the drop test equipment provided in the first aspect, and the method includes: controlling the object acceleration control unit to drive the object to be tested to accelerate along a first direction according to a target acceleration, and the object to be tested that completes the accelerated movement falls into the object angle conversion control unit, and the object angle conversion control unit converts the movement direction of the object to be tested to a second direction, so that the object to be tested accelerates in free fall along the second direction and falls; the second direction is perpendicular to the first direction; controlling the object speed and angle monitoring unit to monitor the drop angle and drop speed of the object to be tested when it falls.

[0018] The drop test method provided in the embodiment of the present application controls the object acceleration control unit to implement an accelerated drop test of the object to be tested; uses the object angle conversion control unit to change the movement direction of the object to be tested to implement a directional drop test; and controls the object speed and angle monitoring unit to monitor the drop angle and drop speed of the object to be tested. During the drop test process, no fixture contacts the object to be tested to avoid changing the posture during free fall, thereby achieving interference-free and high-precision directional drop control; the object to be tested performs free fall with an initial velocity to achieve accelerated free fall, and the height of the drop test equipment is small, so that the drop speed will not be limited by the height, thereby making the drop speed during the fall meet the drop test requirements. In this way, a high-precision directional accelerated drop test can be achieved, and the accuracy of the drop test results can be improved.

[0019] In some implementations, the object acceleration control unit is controlled to drive the object to be tested to accelerate along the first direction according to the target acceleration, including: controlling the acceleration device to drive the loading platform to accelerate along the first direction according to the target acceleration, after the object to be tested follows the loading platform to move to the starting end of the circular turning track, it leaves the loading platform and moves in a circle along the circular turning track to the end end, the circular turning track converts the movement direction of the object to be tested to the second direction, so that the object to be tested accelerates in free fall along the second direction and falls onto the drop plate. In this way, a directional accelerated drop test can be implemented to ensure that the drop speed during the drop meets the drop test requirements.

[0020] In some implementations, the object speed and angle monitoring unit is controlled to monitor the drop angle and drop speed of the object to be tested when it falls, including: controlling a high-speed camera to take a picture of the object to be tested falling onto the drop plate at a photographing frame rate; and determining the drop angle and drop speed of the object to be tested based on the picture. In this way, the directional acceleration drop test process can be controlled with high precision to improve the accuracy of the drop test results.

[0021] In some implementations, determining the falling speed of the object to be tested according to the pictures includes: obtaining two pictures of the same position before the falling; determining the falling displacement of the object to be tested according to the position of the object to be tested in the two pictures; and determining the falling speed of the object to be tested according to the falling displacement. And, determining the falling speed according to the following formula: : ; In the formula, is the frame rate of the high-speed camera, The value range is 1000 frames / second to 10000 frames / second; is the drop displacement of the object to be tested in the two pictures at the same position before the drop. In this way, the drop speed will not be limited by the height of the drop test equipment, meeting the requirements of the accelerated drop test, and the accuracy of the result of this accelerated drop test can be judged based on the drop speed.

[0022] In some implementations, determining the drop angle of the object to be tested according to the image includes: determining the drop posture of the object to be tested according to the image; and determining the drop angle of the object to be tested according to the drop posture of the object to be tested. In this way, whether the result of this directional drop test is accurate can be determined according to the drop angle.

[0023] In a third aspect, the present application further provides a computer-readable storage medium, in which program instructions are stored. When the program instructions are executed on a computer, the computer executes the drop test method provided in the first aspect.

[0024] In a fourth aspect, the present application further provides a control system, comprising: a memory and a processor; the memory stores program instructions, and when the program instructions are executed by the processor, the control system executes the drop test method provided in the first aspect.

[0025] In a fifth aspect, the present application also provides a computer program product, which, when executed on a computer, enables the computer to execute the drop test method provided in the first aspect above.

[0026] It can be understood that the computer-readable storage medium, control system and computer program product provided in the third to fifth aspects are all applied to the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0029] Figure 2 It is a first structural schematic diagram of a drop test machine;

[0030] Figure 3 is a second structural schematic diagram of a drop test machine;

[0031] Figure 4 is a structural block diagram of a drop test device provided in an embodiment of the present application;

[0032] Figure 5 is a schematic diagram of the structure of a drop test device provided in an embodiment of the present application;

[0033] Figure 6 is a schematic diagram of the structure of an object acceleration control unit provided in an embodiment of the present application;

[0034] Figure 7 is a schematic diagram of the structure of different states of the object acceleration control unit provided in an embodiment of the present application;

[0035] Figure 8 is a schematic diagram of the structure of the loading platform provided in the embodiment of the present application;

[0036] Fig. 9 is a schematic diagram of the motion state of the object to be tested provided in an embodiment of the present application;

[0037] Fig.10 is a schematic diagram of two pictures taken by a high-speed camera provided in an embodiment of the present application;

[0038] Fig.11 is a schematic diagram of the falling posture of the object to be tested provided in an embodiment of the present application;

[0039] Fig.12 is a flow chart of the drop test method provided in an embodiment of the present application;

[0040] Fig.13 It is a structural block diagram of the control system provided in the embodiment of the present application.

[0041] Illustration Description:

[0042] Among them, 10-display screen, 20-middle frame, 31-support frame, 32-synchronous track, 33-fixture, 34-control device, 35-test equipment; 100-object acceleration control unit, 101-carrying platform, 1011-baffle, 1012-escape port, 1013-slider, 102-acceleration device, 1021-linear magnetic track, 1022-mover, 1023-slot; 200-object angle conversion control unit, 201-circular steering track, 2 011-fracture, 2012-starting end, 2013-end end; 300-object speed and angle monitoring unit, 301-high-speed camera, 302-base; 401-bracket, 402-drop plate; 500-general control unit; 600-object to be tested, 601-test area; 701-touch screen, 7011-display panel, 7012-touch sensor, 702-memory, 703-processor, 704-communication module, 705-communication bus. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, other embodiments obtained by ordinary technicians in this field without making creative work all belong to the protection scope of the present application.

[0044] In the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In addition, in the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0046] The professional terms mentioned in the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.

[0047] The relationship between velocity, acceleration and time is: In the formula, is the initial velocity, is the final velocity, the unit of velocity is m / s; is the acceleration in meters per second^2; The time is in seconds.

[0048] The relationship between displacement, velocity, acceleration and time: In the formula, is the displacement in meters; is the initial velocity, is the acceleration, For time.

[0049] Free fall refers to the movement of a regular object under the influence of gravity only, with an initial velocity of zero. In other words, the object is stationary when it starts to fall, that is, the initial velocity is ; During the falling process, the object is no longer affected by any external forces except gravity. The calculation formula for free fall motion is: ,in, is the speed of the object in meters per second; is the height of the object from the horizontal plane, in meters; is the acceleration due to gravity, in meters per second^2.

[0050] Gravity refers to the force exerted on objects on the surface of the earth due to the attraction of the earth. Indicates. Gravity The formula is: In the formula, is the weight of the object in kilograms.

[0051] Centripetal force refers to the resultant external force that points to the center of the circle (center of curvature) when an object moves along a circular or curved track. The centripetal force points to the center of the circle, and the object controlled by the centripetal force moves along the tangent direction, that is, the centripetal force can change the direction of motion of the controlled object. The formula is: In the formula, is the radius of the object's circular motion, in meters; is the speed of the object. When an object moves in a circle, the magnitude of the centripetal force is equal to the weight of the object, which can prevent the object from being pulled toward the center of the circle.

[0052] Gravitational potential energy is the energy that an object has due to the effect of gravity. The gravitational potential energy of an object at a point in space is equal to the work done by gravity when the object moves from that point to a reference point (i.e. a specific horizontal plane). The formula is: In the formula, It is the height of an object from a horizontal plane, in meters. The horizontal plane can be artificially defined and is not a unified standard.

[0053] Kinetic energy refers to the energy an object has due to its motion. The formula is: .

[0054] An object has gravitational potential energy at a certain height. When it is only affected by gravity, the object will fall due to gravity, and its gravitational potential energy will be converted into kinetic energy. According to the kinetic energy formula, the kinetic energy of an object is proportional to its mass. The greater the mass, the greater the kinetic energy. The kinetic energy of an object is proportional to the square of its speed. The faster the speed, the greater the kinetic energy, and it grows exponentially. When an object falls, if we ignore air resistance and only affect gravity, the gravitational potential energy of the object will increase with height. The kinetic energy of an object decreases as its speed decreases. The gravitational potential energy is converted into kinetic energy. In this conversion process, the total amount of energy remains unchanged, and the amount of kinetic energy increased is the amount of gravitational potential energy decreased.

[0055] The electronic device described in the embodiments of the present application includes but is not limited to a mobile phone, a notebook computer, a tablet computer, a laptop computer, a virtual reality terminal, an augmented reality terminal, a personal digital assistant or a wearable device, etc. The following description is made by taking the electronic device as a mobile phone.

[0056] Figure 1 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0057] like Figure 1 As shown, the electronic device may include a display screen 10, a middle frame 20 and a rear shell, wherein the display screen 10 and the rear shell are located on opposite sides of the middle frame 20, and the display screen 10, the middle frame 20 and the rear shell are buckled together in sequence to form a whole machine cavity. Among them, the whole machine cavity includes components such as a communication module, a circuit board, a battery, a speaker assembly and a camera assembly, which are not listed here one by one.

[0058] As electronic devices become thinner and lighter, and users' requirements for electronic device functions continue to increase, the requirements for the integration of various components in electronic devices continue to increase. As a result, the structural design and layout of various components inside electronic devices become particularly important, which will lead to weak areas in the design of electronic devices.

[0059] In actual applications, electronic devices often fall onto flat ground, causing damage to the appearance of the electronic device and displacement of internal components due to impact, resulting in abnormalities in the electronic device. Therefore, in order to ensure the performance of the electronic device, performance testing of the electronic device is required.

[0060] At present, drop testers are commonly used as important testing equipment. Drop testers can simulate the drop of electronic equipment during transportation, handling or daily use. By controlling the height, direction and angle of the drop, the impact resistance of electronic equipment in a specific direction can be evaluated.

[0061] To facilitate the explanation of the positions of various components in the drop tester, the embodiment of the present application exemplarily establishes a three-dimensional coordinate system based on the drop tester, wherein the x-axis direction is the width direction of the drop tester, the y-axis direction is the length direction of the drop tester, and the z-axis direction is the height direction of the drop tester.

[0062] Figure 2 It is a first structural schematic diagram of a drop test machine.

[0063] like Figure 2 As shown, the drop test machine includes a support frame 31 , a synchronous rail 32 , a fixture 33 and a control device 34 .

[0064] The synchronous rail 32 is fixed on the support frame 31 in the vertical direction, and the clamp 33 is slidably arranged on the synchronous rail 32. The control device 34 is connected to the synchronous rail 32 to control the synchronous rail 32 to drive the clamp 33 to move in the vertical direction. The control device 34 is connected to the clamp 33 to control the clamp 33 to clamp or release the device to be tested 35. The vertical direction is the z-axis direction, and the device to be tested 35 can be Figure 1 Electronic equipment shown.

[0065] When not testing, the control device 34 controls the fixture 33 to be placed at the bottom of the synchronous track 32, and fixes the device to be tested 35 in the fixture 33. The test area of ​​the device to be tested 35 faces the bottom of the support frame 31, and the degree of fall damage of the test area is evaluated by directional falling.

[0066] Figure 3 It is a second structural schematic diagram of a drop test machine.

[0067] like Figure 3As shown, during the test, the synchronous track 32 is started by the control device 34, and the synchronous track 32 drives the fixture 33 to rise to the specified test height. Among them, the test height It refers to the distance between the test area of ​​the device to be tested 35 and the bottom of the support frame 31 .

[0068] When the fixture 33 reaches the test height , the control device 34 controls the synchronous track 32 to stop transmission, and controls the clamp 33 to release the device to be tested 35. The initial speed of the device to be tested 35 is 0, and it moves from the test height The support frame 31 performs free fall motion and falls to the ground or the bottom of the support frame 31.

[0069] The speed of the device to be tested 35 when it touches the ground in free fall is the falling speed, which can also be called the final falling speed. The drop damage degree at the corresponding drop speed is used to evaluate the impact resistance of the device to be tested 35 at the drop speed. If the device to be tested 35 has the same drop speed, the lower the damage degree of the device to be tested 35, the higher the impact resistance; the higher the damage degree of the device to be tested 35, the lower the impact resistance.

[0070] The directional drop of a conventional drop tester mainly relies on the object's own gravity. According to the calculation formula for free fall motion: , the drop speed of the device to be tested 35 With test height Related.

[0071] In order to ensure the accuracy of the test results, the drop speed is required It is large enough to measure the limit data when the damage degree of the device to be tested 35 is the highest. This requires the test height that the device to be tested 35 reaches The higher, for example, the test height When the drop speed is 8 meters, the drop speed can be guaranteed. Meet the test requirements. However, in order to improve the test height , it is necessary to increase the height of the drop tester, which increases the size of the drop tester and occupies more space. Conventional test rooms cannot accommodate drop testers. It can be seen that when relying on the object's own gravity for directional drop testing, the drop speed is It will be subject to the height limit of the drop test machine and cannot meet the accelerated drop test.

[0072] The drop speed of the device under test is 35 When the height of the drop tester is limited, in order to Increase the falling speed , usually an acceleration device (not shown in the figure) can be added in the vertical direction of the drop tester. The acceleration device is connected to the control device 34 and the synchronous track 32. During the test, the control device 34 controls the synchronous track 32 to drive the fixture 33 to rise to the acceleration height, which is greater than the test height. At the acceleration height, the control device 34 controls the acceleration device to accelerate the speed at which the synchronous track 32 drives the fixture 33 to move downward in the vertical direction. When the acceleration stops, the fixture 33 is controlled to release the device to be tested 35, so that the device to be tested 35 performs free fall motion with an initial velocity (the velocity is not 0), so as to use the acceleration device to achieve the accelerated motion of the device to be tested 35 performing free fall motion. Correspondingly, a fixture buffer device (not shown in the figure) needs to be added in the vertical direction to buffer the impact of the fixture 33 under the accelerated motion.

[0073] However, under the action of the acceleration device and the fixture buffer device, when the fixture 33 is released at the final state of the drop, the force applied to the device to be tested 35 will change, causing the drop posture to deviate, resulting in a change in the drop angle, making it difficult to meet the directional drop requirement. In addition, adding an acceleration device and a fixture buffer device in the vertical direction will also increase the height of the drop tester, thereby increasing the space occupied by the drop tester in the test room.

[0074] It can be seen that conventional drop testers cannot simultaneously implement directional acceleration drop tests, so that the drop angle and drop speed cannot meet the drop test requirements, resulting in inaccurate drop test results.

[0075] In order to solve the above technical problems, the embodiment of the present application provides a drop test device, in which no fixture contacts the device to be tested during the drop process, and high-precision directional drop control is achieved; and a new acceleration structure is adopted, so that the drop test device can reduce the space occupied in the vertical direction, and thus the drop speed will not be restricted by the height. In this way, a high-precision directional accelerated drop test can be achieved, and the accuracy of the drop test results can be improved.

[0076] Figure 4 It is a structural block diagram of the drop test equipment provided in an embodiment of the present application.

[0077] like Figure 4 As shown, in some embodiments, the drop test equipment may include: an object acceleration control unit 100 , an object angle conversion control unit 200 , an object speed and angle monitoring unit 300 , and a general control unit 500 .

[0078] The object acceleration control unit 100 is configured to drive the object to be tested 600 to accelerate along a first direction according to a target acceleration.

[0079] The object angle conversion control unit 200 is connected to the object acceleration control unit 100. The object angle conversion control unit 200 is configured to receive the object to be tested 600 that has completed the accelerated motion, and to convert the motion direction of the object to be tested 600 to a second direction, so that the object to be tested 600 moves in a free fall acceleration motion and falls along the second direction; the second direction is perpendicular to the first direction.

[0080] The object speed and angle monitoring unit 300 is configured to monitor the falling angle and falling speed of the object to be tested 600 when it falls.

[0081] The overall control unit 500 is connected to the object acceleration control unit 100 and the object speed and angle monitoring unit 300 respectively, and the overall control unit 500 is used to control the object acceleration control unit 100 and the object speed and angle monitoring unit 300 to perform corresponding actions. Exemplarily, the overall control unit 500 can be a computer, a controller, etc., such as a programmable logic controller (PLC).

[0082] Figure 5 It is a structural schematic diagram of the drop test equipment provided in an embodiment of the present application.

[0083] like Figure 5 As shown, for the convenience of describing the movement direction, the first direction D1 is defined as the horizontal direction, which is the direction of the x-axis or y-axis. This article takes the horizontal direction as the x-axis direction as an example. The second direction D2 is defined as the vertical direction, which is the z-axis direction.

[0084] In some embodiments, the object acceleration control unit 100 may include: a loading platform 101 and an acceleration device 102 .

[0085] The object platform 101 is used to carry the object to be tested 600. For example, the mass of the object to be tested 600 can be 100g-600g. The object to be tested 600 can be any of the aforementioned electronic devices. This article takes the object to be tested 600 as a mobile phone as an example for exemplary description.

[0086] The acceleration device 102 is arranged in a horizontal direction, and the sliding direction provided by the acceleration device 102 is a horizontal direction. The object loading platform 101 is located on the acceleration device 102 .

[0087] The acceleration device 102 is connected to the main control unit 500. According to the control instruction of the main control unit 500, the acceleration device 102 is configured to drive the loading platform 101 along the first direction D1 according to the target acceleration. Accelerate the movement to drive the object to be tested along the first direction D1 according to the target acceleration Accelerated motion. Among them, the target acceleration Greater than 1 (acceleration due to gravity).

[0088] Figure 6 It is a schematic diagram of the structure of an object acceleration control unit provided in an embodiment of the present application.

[0089] like Figure 6 As shown, the acceleration device 102 may be an electromagnetic acceleration device, such as a linear motor. In this scenario, the acceleration device 102 may include a linear magnetic track 1021 and a mover 1022 .

[0090] The linear magnetic track 1021 is arranged in a horizontal direction and is fixed. The length direction of the linear magnetic track 1021 is parallel to the first direction D1, and the sliding direction provided by the linear magnetic track 1021 is a horizontal direction.

[0091] The mover 1022 is slidably connected to the linear magnetic rail 1021 . Exemplarily, two opposite side walls of the linear magnetic rail 1021 are provided with wire grooves 1023 . The bottoms of both sides of the mover 1022 are snapped into the wire grooves 1023 and can slide in the wire grooves 1023 .

[0092] Electromagnetic induction is generated between the linear magnetic track 1021 and the mover 1022, driving the mover 1022 to reciprocate along the linear magnetic track 1021. For example, the linear magnetic track 1021 is composed of an iron core and a coil, and a magnetic field is generated by current, while the mover 1022 is composed of a magnet and a conductor, and the mover 1022 moves under the action of magnetic force.

[0093] The loading platform 101 is slidably connected to the linear magnetic track 1021 through the slider 1013. The loading platform 101 is fixedly connected to the slider 1013, and the slider 1013 is slidably connected to the linear magnetic track 1021. The connection method between the slider 1013 and the linear magnetic track 1021 is the same as the connection method between the mover 1022 and the linear magnetic track 1021, which will not be repeated here.

[0094] The mover 1022 is located on the side of the object-carrying platform 101 that is away from the moving direction. The acceleration device 102 receives the control instruction of the general control unit 500, and electromagnetic induction is generated between the linear magnetic track 1021 and the mover 1022, so that the mover 1022 slides along the linear magnetic track 1021 at the target acceleration. The mover 1022 is configured to drive the slider 1013 to slide along the linear magnetic track 1021 at the target acceleration, so as to drive the object-carrying platform 101 to move along the first direction D1 at the target acceleration.

[0095] In order to facilitate the mover 1022 to drive the loading platform 101 to reciprocate when it reciprocates along the linear magnetic track 1021, so as to facilitate the reset after the drop test is completed, the mover 1022 can be connected to the slider 1013. The connection method between the mover 1022 and the slider 1013 can be a fixed connection method such as welding, and can also be connected by a traction rope (not shown in the figure). The two ends of the traction rope are respectively connected to the mover 1022 and the slider 1013. When resetting, the mover 1022 brings the slider 1013 back to the initial position through the traction rope, so that the loading platform 101 returns to the initial position, so as to facilitate the next drop test.

[0096] It should be noted that the acceleration device 102 may also be a pneumatic acceleration device or other driving devices, which are not limited here.

[0097] Figure 7 It is a structural schematic diagram of different states of the object acceleration control unit provided in an embodiment of the present application.

[0098] like Figure 7 As shown in (a), when the drop test is not performed, the loading platform 101 is located at the initial position of the linear magnetic track 1021. Figure 5 , the object platform 101 is stationary at one end of the linear magnetic track 1021 away from the object angle conversion control unit 200. The object to be tested 600 is placed on the object platform 101, and the test area 601 of the object to be tested 600 faces the first direction D1. For example, if the test area 601 of the object to be tested 600 is a frame of the object to be tested 600, the frame faces the first direction D1, that is, toward the object angle conversion control unit 200.

[0099] The length of the slide of the loading platform 101 on the linear magnetic track 1021 is the acceleration displacement of the object to be tested 600 The acceleration device 102 is used to accelerate the displacement The object to be tested 600 is accelerated. For example, the acceleration displacement Less than or equal to 3 meters, under the premise of ensuring that the final drop velocity meets the test requirements, it can avoid excessively increasing the size of the drop test equipment along the x-axis direction.

[0100] Based on the position of the loading platform 101 relative to the linear magnetic track 1021 and the total length of the linear magnetic track 1021, the acceleration displacement of the loading platform 101 when not tested is determined. . Acceleration displacement It can be understood that the right end of the loading platform 101 and the end point of the linear magnetic track 1021 ( Figure 7The distance between the right end of the slider 1013 and the end point of the linear magnetic track 1021 is the distance between the right end of the slider 1013 and the end point of the linear magnetic track 1021. The end point of the linear magnetic track 1021 is the connection point between the linear magnetic track 1021 and the object angle conversion control unit 200.

[0101] like Figure 7 As shown in (b), during the drop test, the overall control unit 500 controls the acceleration device 102 to drive the loading platform 101 along the first direction D1 according to the target acceleration. Accelerated motion. On the linear magnetic track 1021, the motion state of the carrier platform 101 is the motion state of the object to be tested 600. When the object to be tested 600 follows the carrier platform 101 and accelerates to the end point A of the linear magnetic track 1021, the main control unit 500 controls the acceleration device 102 to stop accelerating the carrier platform 101, and the carrier platform 101 stops at the end point A of the linear magnetic track 1021, and the object to be tested 600 continues to move forward with the final velocity.

[0102] From the start of the accelerated motion to the process where the loading platform 101 accelerates to point A and stops accelerating, the initial velocity of the loading platform 101 (the object to be tested 600) is 0. According to the relationship between velocity, acceleration and time, and the relationship between displacement, velocity, acceleration and time, the final velocity of the object to be tested 600 when it reaches the end point (point A) of the linear magnetic track 1021 can be determined:

[0103] Formula (I);

[0104] In the formula, is the final velocity of the object to be tested 600 when it reaches point A, is the target acceleration, is the accelerated displacement corresponding to the accelerated motion.

[0105] When the loading platform 101 slides to point A of the linear magnetic track 1021, the speed is the maximum, for example, the final speed is It can reach 14m / s, which is equivalent to the final velocity of a free fall from a height of 10 meters. In this way, the object to be tested 600 can be subjected to an accelerated drop test at the maximum speed to ensure that the subsequent drop speed during the drop meets the test requirements.

[0106] The object acceleration control unit 100 provided in the embodiment of the present application adopts a flat layout, and the mover 1022 is located on one side of the loading platform 101. Compared with the commonly used up and down layout, it can not only reduce the volume of the drop test equipment and reduce the vertical space occupied by the laboratory; it can also ensure that the drop speed will not be limited by the height of the drop test equipment, so as to achieve the accelerated drop test requirements of the object 600 to be tested.

[0107] Figure 8 It is a schematic diagram of the structure of the loading platform provided in the embodiment of the present application.

[0108] Combination Figure 5 and Figure 8 As shown in (a), after the loading platform 101 accelerates to point A of the linear magnetic track 1021, the object to be tested 600 is separated from the loading platform 101, so that the object to be tested 600 has a final velocity Continue moving forward.

[0109] To achieve the detachment of the object to be tested 600 , in one implementation, the loading platform 101 may include: a baffle 1011 and a detachment opening 1012 , wherein the baffle 1011 and the detachment opening 1012 are located at opposite ends of the loading platform 101 along the first direction D1 .

[0110] The baffle 1011 is away from the moving direction of the object to be tested 600. For example, when the object to be tested 600 accelerates to the right, the baffle 1011 is located at the left end of the loading platform 101. The baffle 1011 is used to resist the object to be tested 600 when the loading platform 101 accelerates, so as to keep the object to be tested 600 and the loading platform 101 relatively still during the accelerated movement, realize the accelerated movement of the object to be tested 600, and prevent the object to be tested 600 from detaching from the loading platform 101 under the action of inertia, thereby affecting the test process.

[0111] The escape opening 1012 faces the moving direction of the object to be tested 600. For example, when the object to be tested 600 accelerates to the right, the escape opening 1012 is located at the right end of the loading platform 101, and the escape opening 1012 faces the object angle conversion control unit 200. The escape opening 1012 is used to allow the object to be tested 600 to escape from the loading platform 101 after the accelerated movement is completed, so that after reaching point A, the object to be tested 600 escapes from the loading platform 101 through the escape opening 1012 and continues to move forward.

[0112] Combination Figure 5 and Figure 8 As shown in (b), in another implementation, the object platform 101 may be a frame with an opening at one end, the opening facing the direction of motion, that is, facing the object angle conversion control unit 200. The opening is used to form a disengagement opening 1012, and the side wall of the frame opposite to the opening is used to form a baffle 1011, the baffle 1011 is used to resist the object to be tested 600 when the object platform 101 accelerates, and the disengagement opening 1012 is used to allow the object to be tested 600 to disengage from the object platform 101 after the accelerated motion is completed.

[0113] It should be noted that the loading platform 101 may also adopt other structures, which are not limited here.

[0114] See again Figure 5 In some embodiments, the object angle conversion control unit 200 includes: a circular steering track 201.

[0115] The circular turning track 201 is an incomplete circular structure, and is used to provide a circular motion path to change the motion direction and motion speed of the object to be tested 600 .

[0116] The circular turning track 201 includes a break 2011, and a starting end 2012 and a terminal end 2013 located at both ends of the break 2011. The starting end 2012 is connected to the linear magnetic track 1021, and the connection position between the starting end 2012 and the linear magnetic track 1021 is point A, that is, the terminal end of the linear magnetic track 1021 is the starting point of the circular turning track 201. The break 2011 faces the linear magnetic track 1021, and the terminal end 2013 is close to the loading platform 101 relative to the starting end 2012, and is located on the same side of the linear magnetic track 1021 as the loading platform 101.

[0117] Combination Figure 5 and Figure 7 The object to be tested 600 separated from the loading platform 101 has a final velocity It falls into the circular turning track 201 and moves in a circle, and then moves in a circle to the end 2013, and then moves in a free fall at the fracture 2011. In this way, the movement direction and movement speed of the object to be tested 600 can be changed to achieve a directional accelerated drop test.

[0118] In some embodiments, the circular turning track 201 is a three-quarter circular ring structure. The tangent direction of the circular turning track 201 at the starting end 2012 is parallel to the first direction D1, which can ensure that the object to be tested 600 can fall into the circular turning track 201 along the first direction D1 and perform circular motion after leaving the loading platform 101. The tangent direction of the circular turning track 201 at the terminal end 2013 is parallel to the second direction D2, which can ensure that the direction of the free fall acceleration motion of the object to be tested 600 at the terminal end 2013 is along the vertical direction.

[0119] In this way, the circular turning track 201 can accurately control the final drop angle of the object to be tested 600 while achieving the speed change, thereby realizing a high-precision directional accelerated drop test.

[0120] Fig. 9 It is a schematic diagram of the motion state of the object to be tested provided in an embodiment of the present application.

[0121] like Fig. 9As shown, in order to facilitate the description of the motion state of the object to be tested 600 during the drop test, point A is defined as the reference point, and the horizontal plane where point A is located is defined as the reference horizontal plane. The highest point of the circular turning track 201 is defined as point B, and the end point 2013 of the circular turning track 201 is defined as point C. In the vertical direction, point B is higher than point A and point C, and point C is higher than point A.

[0122] Taking the test area 601 of the object to be tested 600 as the frame of the object to be tested 600 as an example, the object to be tested 600 is placed along the first direction D1, and the frame faces the circular turning track 201. The end of the object to be tested 600 opposite to the frame abuts against the baffle 1011 to prevent the object to be tested 600 from moving relative to the loading platform 101 during the accelerated motion.

[0123] During the drop test, the object to be tested 600 follows the loading platform 101 and accelerates to point A. After the object to be tested 600 leaves the loading platform 101, it moves with a final speed of It falls into the circular turning track 201, and moves upward along the right circular arc from point A by inertia. When it reaches the highest point, point B, the speed is the smallest and the gravitational potential energy is the largest. After passing the highest point, the gravitational potential energy and kinetic energy are converted, and the object to be tested 600 makes an accelerated turning motion along the left circular arc, and the speed direction is downward when it reaches point C. At this time, the object to be tested 600 leaves the circular turning track 201, and the object to be tested 600 makes an accelerated motion of a free fall at point C along the second direction D2.

[0124] The radius of the circular turning track 201 is defined as During the turning motion, the gravity of the object to be tested 600 is , the centripetal force is When the object to be tested 600 is at the highest point (point B), the gravity and centripetal force are balanced ( ), we can get:

[0125] Formula (II).

[0126] In the formula, is the speed of the object to be tested 600 at the highest point B.

[0127] Gravitational potential energy of the object to be tested 600 at the highest point (point B) ,kinetic energy ; Gravitational potential energy of the object to be tested 600 at the lowest point (point A) ,kinetic energy .

[0128] According to the balance relationship between the gravitational potential energy and kinetic energy of an object, , we can get:

[0129] Formula (III).

[0130] Based on formula (2) and formula (3), the radius of the circular turning track 201 can be calculated as: . Combined with formula (1), we can get: .

[0131] In order to ensure that the object to be tested 600 does not fall when it moves to the highest point B, the radius of the circular turning track 201 is required to be Satisfies the following relationship:

[0132] Formula (IV).

[0133] According to formula (IV), the radius of the circular turning track 201 is set. When the object to be tested 600 moves from point A to the highest point B, it can be ensured that the object to be tested 600 will not be pulled toward the center of the circular turning track 201. In addition, according to the actual radius of the circular turning track 201 and formula , the theoretical final velocity of the object to be tested 600 reaching point A can be calculated According to formula (I), the actual final velocity of the object to be tested 600 when it reaches point A is determined , the actual final speed Greater than theoretical terminal velocity , which meets the requirement of accelerated motion. In this way, the object to be tested 600 can be prevented from falling at the highest point B, so that it continues to move along the left arc to point C and falls.

[0134] The object to be tested 600 continues to move from the highest point B to point C. At this time, the speed of the object to be tested 600 becomes , is not zero, and its direction is vertically downward. In this way, when the object to be tested 600 is in free fall from point C, it does not rely solely on its own gravity to make a free fall, but the object to be tested 600 has an initial velocity ( ) to achieve accelerated free fall motion and ensure that the falling speed meets the test requirements.

[0135] It should be noted that the calculation method of the speed of point C can refer to the speed of point B, and is determined based on the balance relationship between the gravitational potential energy and kinetic energy of the object, which will not be described here. In addition, the above calculation processes do not consider the influence of friction factors.

[0136] Combination Figure 5 and Fig. 9 In some embodiments, the drop test equipment may further include a bracket 401 and a drop plate 402 .

[0137] The drop plate 402 is fixed on the bracket 401, and the bracket 401 is located on one side of the terminal end 2013 of the circular turning track 201, so that the drop plate 402 is set between the linear magnetic track 1021 and the terminal end 2013. Further, the drop plate 402 is located between the loading platform 101 and the terminal end 2013. The drop plate 402 is used to receive the object 600 to be tested that is subjected to free fall acceleration from the terminal end 2013 to perform a drop test. Exemplarily, the material of the drop plate 402 includes but is not limited to cement board, wooden board, cobblestone board, etc. The drop plate 402 needs to have a certain hardness to ensure the accuracy of the drop test results.

[0138] Since the terminal end 2013 of the circular turning track 201 is located directly above the linear magnetic track 1021, in order to prevent the object 600 to be tested from falling onto the linear magnetic track 1021 at point C, and to prevent the bracket 401 and the drop plate 402 from obstructing the movement of the loading platform 101 relative to the linear magnetic track 1021, the bracket 401 can be arranged across the linear magnetic track 1021, or be located on one side of the linear magnetic track 1021. In this way, it is possible to prevent the bracket 401 and the drop plate 402 from obstructing the movement of the loading platform 101 relative to the linear magnetic track 1021, and the drop plate 402 can be arranged between the linear magnetic track 1021 and the terminal end 2013 to ensure the normal progress of the drop test.

[0139] The position of the drop plate 402 is defined as point D, and point D is located between point A and point C in the vertical direction.

[0140] The object to be tested moves from point C to point D with an initial velocity of 600 ( ) is accelerated by free fall, and after reaching point D, it contacts the drop plate 402, completing a complete directional accelerated drop test at a predetermined drop speed and drop angle. After reaching point D, the speed of the object to be tested 600 is .

[0141] In some embodiments, the object speed and angle monitoring unit 300 may include: a high-speed camera 301 and a base 302 .

[0142] The base 302 is located on the side of the loading platform 101 away from the circular turning track 201, and the high-speed camera 301 is fixed on the base 302. The lens of the high-speed camera 301 faces the drop plate 402, and the lens center of the high-speed camera 301 is located on the same horizontal plane as point D, so as to ensure that the high-speed camera 301 can accurately capture the image of the object 600 to be tested falling onto the drop plate 402.

[0143] The high-speed camera 301 is connected to the main control unit 500 , and the main control unit 500 sends a control instruction to the high-speed camera 301 to control the high-speed camera 301 to take a picture of the object to be tested 600 falling onto the drop plate 402 at a photographing frame rate.

[0144] Photo frame rate The value range is 1000 frames / second to 10000 frames / second, which is the time interval between taking two pictures at the same location. The two pictures at the same position refer to the high-speed camera 301 being aimed at the drop plate 402 and kept still, and the two pictures are taken at the same time interval. Two adjacent pictures taken consecutively.

[0145] The overall control unit 500 determines the falling angle and falling speed of the object to be tested 600 according to the pictures taken by the high-speed camera 301 .

[0146] In some embodiments, the overall control unit 500 is configured to perform the following steps S401 to S403:

[0147] Step S401, obtaining two pictures at the same position before the fall.

[0148] Step S402 : determining the drop displacement of the object 600 to be tested according to the position of the object 600 to be tested in the two pictures.

[0149] Step S403, determining the falling speed of the object to be tested 600 according to the falling displacement.

[0150] Fig.10 It is a schematic diagram of two pictures taken by a high-speed camera provided in an embodiment of the present application.

[0151] like Fig.10 As shown in (a) and (b), at the time interval In the two pictures P1 and P2, the falling positions of the object to be tested 600 are different. For example, in picture P1, the object to be tested 600 is located at position Z1, and in picture P2, the object to be tested 600 is located at position Z2, and position Z2 is lower than position Z1. It should be noted that the falling positions are all based on the end surface of the test area 601, that is, the position of the test area 601 in the picture is the falling position.

[0152] By measuring the distance between position Z1 and position Z2, the drop displacement of the object to be tested 600 can be determined. .

[0153] In this way, we can get .

[0154] In the formula, is the falling speed in meters per second, is the photographing frame rate of the high-speed camera 301, is the drop displacement of the object to be tested 600 in the two pictures at the same position before the drop.

[0155] Drop displacement It is positively correlated with the speed of the free fall of the object to be tested 600. The greater the speed of the free fall of the object to be tested 600, the greater the drop displacement. The larger the drop speed, the The bigger.

[0156] In some embodiments, the overall control unit 500 can be configured to determine the drop speed corresponding to the current drop test process. Compare with the theoretical drop speed to determine whether the drop test process meets the requirements of the accelerated drop test and whether the results of the accelerated drop test are accurate. The corresponding falling speed when the body is in free fall relying only on its own weight .

[0157] If the falling speed If the drop speed is greater than or equal to the theoretical drop speed, it can be determined that the drop test process meets the requirements of the accelerated drop test, and the result of the accelerated drop test is accurate; if the drop speed is If the drop speed is less than the theoretical drop speed, it can be determined that the drop test process does not meet the requirements of the accelerated drop test, and it can be determined that the result of the accelerated drop test is inaccurate.

[0158] The drop test device provided in the embodiment of the present application has an initial velocity ( ), can achieve accelerated free fall motion. The greater the speed of the free fall, the greater the drop displacement. The larger the drop speed of the object to be tested 600 when it falls on the drop plate 402, the , much higher than the test height of conventional drop testers The corresponding falling speed when the body is in free fall relying only on its own weight It can be seen that the drop test equipment can realize accelerated drop test, making the drop speed far exceed the speed of natural drop; the drop speed It will not be restricted by the height of the drop test equipment and can meet the requirements of accelerated drop tests.

[0159] In some embodiments, the overall control unit 500 is configured to perform the following steps S501 to S502:

[0160] Step S501, determining the falling posture of the object to be tested according to the picture.

[0161] Step S502 : determining the falling angle of the object 600 to be tested according to the falling posture of the object 600 to be tested.

[0162] The general control unit 500 determines the falling posture of the object to be tested 600 from the picture according to the picture of the object to be tested 600 falling on the falling plate 402, that is, the picture of the object to be tested 600 contacting the falling plate 402. The falling posture refers to the state of the object to be tested 600 when it falls on the falling plate 402, and the falling posture can be determined by the state of the object to be tested 600 and the vertical direction, including the vertical state or the inclined state.

[0163] The overall control unit 500 determines the drop angle of the object to be tested 600 according to the drop posture. The drop angle refers to the angle α1 between the surface of the test area 601 of the object to be tested 600 and the surface of the drop plate 402, or the angle α2 between the object to be tested 600 and the vertical direction (the second direction D2), and the angle α1 is equal to the angle α2.

[0164] In the drop test device provided in the embodiment of the present application, the direction of the free fall acceleration motion of the object 600 to be tested at point C is along the vertical direction, and the posture after the accelerated fall can be accurately controlled. In other words, the drop angle (α1, α2) of the object 600 to be tested is zero.

[0165] In some embodiments, the overall control unit 500 can determine whether the drop test process meets the requirements of the directional drop test according to the drop angle, so as to determine whether the result of the directional drop test is accurate.

[0166] Fig.11 It is a schematic diagram of the falling posture of the object to be tested provided in an embodiment of the present application.

[0167] like Fig.11 As shown in (a), in the picture of the object to be tested 600 falling onto the drop plate 402, if the overall control unit 500 determines that the drop posture of the object to be tested 600 is in a vertical state, it is determined that the object to be tested 600 falls from point C along the second direction D2, and further determines that the drop angle (α1, α2) is zero. In other words, the object to be tested 600 is parallel to the vertical direction, and the surface of the test area 601 is parallel to the surface of the drop plate 402.

[0168] In this scenario, the overall control unit 500 can determine that the drop test process meets the requirements of the directional drop test and the result of the directional drop test is accurate.

[0169] like Fig.11As shown in (b), if the overall control unit 500 determines that the falling posture of the object to be tested 600 is in a tilted state, it determines that the falling angle (α1, α2) is not zero.

[0170] If the drop angle (α1, α2) is less than or equal to 3 degrees, it can be determined that the object to be tested 600 falls from point C along the second direction D2. In this scenario, the overall control unit 500 can determine that the drop test process meets the requirements of the directional drop test and the result of the directional drop test is accurate.

[0171] If the drop angle (α1, α2) is greater than 3 degrees, it can be determined that the object to be tested 600 falls from point C in a direction inclined relative to the second direction D2. In other words, the object to be tested 600 is inclined relative to the vertical direction, and the surface of the test area 601 is inclined relative to the surface of the drop plate 402. In this scenario, the overall control unit 500 can determine that the drop test process does not meet the requirements of the directional drop test, and the result of the directional drop test is inaccurate.

[0172] It can be seen that when the object to be tested 600 performs free fall acceleration and falls onto the drop plate 402, if the main control unit 500 determines that the falling angle of the object to be tested 600 is within an error range of 3 degrees based on the falling posture presented in the picture, it can be determined that the result of this directional drop test is accurate and meets the requirements of the directional drop test.

[0173] In the drop test equipment provided by the embodiment of the present application, the object acceleration control unit 100, the object angle conversion control unit 200 and the object speed and angle monitoring unit 300 are arranged in the horizontal direction, which can reduce the height of the drop test equipment and reduce the occupied space. The object acceleration control unit 100 is used to implement the accelerated drop test of the object to be tested 600; the object angle conversion control unit 200 is used to change the movement direction of the object to be tested 600 to achieve a directional drop test; the object speed and angle monitoring unit 300 is used to monitor the drop angle and drop speed of the object to be tested 600. During the drop test process, no fixture contacts the object to be tested 600, avoiding the change of posture during free fall motion, and the posture control is accurate after the accelerated drop, so as to achieve interference-free high-precision directional drop control. The object to be tested 600 performs free fall motion with an initial velocity to achieve accelerated free fall motion, and the height of the drop test equipment is small, so that the drop speed will not be limited by the height, and the drop speed far exceeds the object's own drop speed, thereby making the drop speed during the drop meet the requirements of the accelerated drop test. In this way, the drop test equipment provided in the embodiment of the present application can not only realize high-precision directional accelerated drop test and improve the accuracy of the drop test results; it can also monitor the actual drop posture and drop speed of the object 600 to be tested to determine whether the drop test process meets the requirements of the directional accelerated drop test, further ensure the accuracy of the drop test results, and reduce costs.

[0174] The drop test equipment is suitable for object impact resistance test scenarios or maximum acceleration load test scenarios, etc. The object to be tested 600 can be an electronic equipment product, or a packaging industry product, medical device or furniture product, etc.

[0175] Fig.12 It is a flow chart of the drop test method provided in an embodiment of the present application.

[0176] like Fig.12 As shown, an embodiment of the present application provides a drop test method, which is applied to the drop test device provided by any of the above embodiments. The drop test method may include the following steps S101 to S102:

[0177] Step S101 : controlling the object acceleration control unit 100 to drive the object to be tested 600 to accelerate along a first direction according to a target acceleration.

[0178] The object to be tested 600 that has completed the accelerated motion falls into the object angle conversion control unit 200, and the object angle conversion control unit 200 converts the motion direction of the object to be tested 600 to the second direction D2, so that the object to be tested 600 moves in free fall acceleration along the second direction D2 and falls; the second direction D2 is perpendicular to the first direction D1.

[0179] Step S102 , controlling the object speed and angle monitoring unit 300 to monitor the falling angle and falling speed of the object to be tested 600 when it falls.

[0180] When performing a directional acceleration drop test, the overall control unit 500 controls the object acceleration control unit 100 and the object speed and angle monitoring unit 300 to perform corresponding actions. For specific details, reference may be made to the corresponding contents of the aforementioned embodiments and will not be repeated here.

[0181] In some embodiments, again referring to Figure 5 The structure of the control unit 100 for controlling object acceleration is shown, and step S101 may include the following steps:

[0182] Step S201 , controlling the acceleration device 102 to drive the loading platform 101 to accelerate along the first direction D1 according to the target acceleration.

[0183] Among them, after the object to be tested 600 follows the loading platform 101 to move to the starting end 2012 of the circular turning track 201, it leaves the loading platform 101 and moves in a circle along the circular turning track 201 to the end end 2013. The circular turning track 201 converts the movement direction of the object to be tested 600 to the second direction D2, so that the object to be tested 600 moves in a free fall acceleration along the second direction D2, and the object to be tested 600 falls onto the drop plate 402.

[0184] The overall control unit 500 controls the acceleration device 102 to drive the loading platform 101 to accelerate the object 600 to be tested along the first direction D1 according to the target acceleration, so that the object 600 to be tested has an initial velocity ( ), the object to be tested 600 is turned from the circular ring to the end 2013 of the track 201 with an initial velocity ( ) to ensure that the falling speed meets the drop test requirements.

[0185] It should be noted that the structure of the drop test equipment, as well as the specific process of the accelerated motion and circular motion of the object to be tested 600, etc., can refer to the corresponding contents of the aforementioned embodiments and will not be repeated here.

[0186] In some embodiments, step S102 may include the following steps S301 to S302:

[0187] Step S301 , controlling the high-speed camera 301 to take a picture of the object to be tested 600 falling onto the drop plate 402 at a photographing frame rate.

[0188] Step S302: Determine the drop angle and drop speed of the object 600 to be tested according to the picture.

[0189] Among them, the frame rate of the photo The value range is 1000 frames / second to 10000 frames / second, which is the time interval between taking two pictures at the same location. .

[0190] The overall control unit 500 controls the high-speed camera 301 to take a picture of the object to be tested 600 falling onto the drop plate 402 , and determines the drop angle and drop speed of the object to be tested 600 according to the picture.

[0191] In some embodiments, when determining the falling speed of the object to be tested 600 according to the picture, step S302 may include the following steps S401 to S403:

[0192] Step S401, obtaining two pictures at the same position before the fall.

[0193] Step S402 : determining the drop displacement of the object 600 to be tested according to the position of the object 600 to be tested in the two pictures.

[0194] Step S403, determining the falling speed of the object to be tested 600 according to the falling displacement.

[0195] Determine the drop speed according to the following formula: :

[0196] ;

[0197] In the formula, is the photographing frame rate of the high-speed camera 301, The value range is 1000 frames / second to 10000 frames / second; is the drop displacement of the object to be tested 600 in the two pictures at the same position before the drop.

[0198] It should be noted that the structure of the drop test equipment, as well as the total control unit 500 determining the drop speed of the object to be tested 600 according to the picture and other contents can refer to the corresponding contents of steps S401 to S403 provided in the aforementioned embodiment, which will not be repeated here.

[0199] In some embodiments, when determining the drop angle of the object to be tested 600 according to the picture, step S302 may include the following steps S501 to S502:

[0200] Step S501, determining the falling posture of the object to be tested according to the picture.

[0201] Step S502 : determining the drop angle of the object to be tested 600 according to the drop angle of the object to be tested 600 .

[0202] The overall control unit 500 can determine whether the result of this directional drop test is accurate based on the drop angle.

[0203] It should be noted that the content of the total control unit 500 determining the drop angle of the object to be tested 600, and the content of judging whether the result of this directional drop test is accurate according to the drop angle, can refer to the corresponding content of step S501 to step S502 provided in the above embodiment, and the above Fig.11 The corresponding contents provided by the illustrated embodiments are not repeated here.

[0204] The drop test method provided in the embodiment of the present application controls the object acceleration control unit 100 to implement an accelerated drop test of the object to be tested 600; uses the object angle conversion control unit 200 to change the movement direction of the object to be tested 600 to implement a directional drop test; and controls the object speed and angle monitoring unit 300 to monitor the drop angle and drop speed of the object to be tested 600. During the drop test process, no fixture contacts the object to be tested 600 to avoid changing the posture during free fall motion, and the posture control is accurate after the accelerated drop, so as to achieve interference-free and high-precision directional drop control. The object to be tested 600 performs free fall motion with an initial velocity to achieve accelerated free fall motion, and the height of the drop test equipment is small, so that the drop speed will not be limited by the height, and the drop speed far exceeds the object's own drop speed, thereby making the drop speed during the drop meet the drop test requirements. In this way, the drop test method provided in the embodiment of the present application can not only realize high-precision directional accelerated drop test and improve the accuracy of the drop test results; it can also monitor the actual drop posture and drop speed of the object 600 to be tested to determine whether the drop test process meets the requirements of the directional accelerated drop test, further ensure the accuracy of the drop test results, and reduce costs.

[0205] It should be noted that the structure of the drop test equipment used in the drop test method provided in the embodiment of the present application, as well as the working principle of the drop test equipment, can all refer to the corresponding contents of the aforementioned drop test equipment embodiment and will not be repeated here.

[0206] Fig.13 It is a structural block diagram of the control system provided in the embodiment of the present application.

[0207] like Fig.13As shown, in some embodiments, the control system may include: a touch screen 701, a memory 702, a processor 703 and a communication module 704. The above-mentioned components may be connected via one or more communication buses 705. The above-mentioned components may be connected via one or more communication buses 705. The touch screen 701 may include a display panel 7011 and a touch sensor 7012, wherein the display panel 7011 is used to display an image, and the touch sensor 7012 may pass the detected touch operation to the application processor to determine the type of touch event, and provide visual output related to the touch operation through the display panel 7011. The processor 703 may include one or more processing units, for example: the processor 703 may include an application processor, a modem processor, a graphics processor, an image signal processor, a controller, a video codec, a digital signal processor, a baseband processor, and / or a neural network processor, etc. Among them, different processing units may be independent devices or integrated in one or more processors. The memory 702 is coupled to the processor 703 for storing various software programs and / or computer instructions, and the memory 702 may include a volatile memory and / or a non-volatile memory. When the processor executes the computer instructions, the control system can perform the various functions or steps of the above method embodiments.

[0208] When the software program and / or multiple groups of instructions in the memory 702 are executed by the processor 703, the control system implements the following method steps: controlling the object acceleration control unit to drive the object to be tested to accelerate along the first direction according to the target acceleration, wherein the object to be tested that has completed the accelerated movement falls into the object angle conversion control unit, and the object angle conversion control unit converts the movement direction of the object to be tested to a second direction, so that the object to be tested accelerates and falls in a free fall along the second direction; the second direction is perpendicular to the first direction; controlling the object speed and angle monitoring unit to monitor the falling angle and falling speed of the object to be tested when it falls.

[0209] An embodiment of the present application further provides a computer-readable storage medium, in which program instructions are stored. When the program instructions are executed on a computer, the computer executes the drop test method provided in the aforementioned embodiment.

[0210] The embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, it enables the computer to execute each function or step executed in the above method embodiment.

[0211] The embodiment of the present application also provides a chip system, which includes at least one processor and at least one interface circuit. The processor and the interface circuit can be interconnected through lines. For example, the interface circuit can be used to receive signals from other devices (such as the memory of an electronic device). For another example, the interface circuit can be used to send signals to other devices. Exemplarily, the interface circuit can read instructions stored in the memory and send the instructions to the processor. When the instruction is executed by the processor, the electronic device can execute the various steps in the above embodiments. Of course, the chip system can also include other discrete devices, which is not specifically limited in the embodiment of the present application.

[0212] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0213] In the several embodiments provided in the present application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0214] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0215] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0216] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0217] It should be noted that those skilled in the art will readily come up with other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope of the present application is indicated by the following claims.

[0218] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A drop test device, characterized in that: include: An object acceleration control unit (100) is configured to drive the object to be tested to accelerate along a first direction according to a target acceleration; The object angle conversion control unit (200) comprises a circular turning track (201) having a break (2011), the circular turning track (201) being configured to receive the object to be tested that has completed the accelerated motion, the object to be tested performing a circular motion from a starting end (212) of the break (211) of the circular turning track (201) to an end end (2013), so as to convert the motion direction of the object to be tested to a second direction, so that the object to be tested performs a free-fall accelerated motion and falls along the second direction; The second direction is perpendicular to the first direction; The object speed and angle monitoring unit (300) is configured to monitor the falling angle and falling speed of the object to be tested when it falls.

2. The drop test equipment according to claim 1, characterized in that: The object acceleration control unit (100) comprises: An object carrying platform (101) for carrying the object to be tested; An acceleration device (102) is connected to the object carrying platform (101), and the acceleration device (102) is configured to drive the object carrying platform (101) to move along the first direction at the target acceleration, so as to drive the object to be tested to move along the first direction at the target acceleration.

3. The drop test equipment according to claim 2, characterized in that: The object carrying platform (101) comprises: a baffle (1011) and a disengagement opening (1012), wherein the baffle (1011) and the disengagement opening (1012) are located at two opposite ends of the object carrying platform (101) along the first direction; The baffle (1011) faces away from the moving direction of the object to be tested, and the baffle (1011) is used to resist the object to be tested when the object carrying platform (101) is accelerating, so as to keep the object to be tested and the object carrying platform (101) relatively still during the accelerating movement; The escape opening (1012) faces the movement direction of the object to be tested, and the escape opening (1012) is used to allow the object to be tested to escape from the object loading platform (101) after completing the accelerated movement.

4. The drop test equipment according to claim 3, characterized in that: The acceleration device (102) comprises a linear magnetic track (1021) and a mover (1022); The mover (1022) is slidably connected to the linear magnetic track (1021), and the length direction of the linear magnetic track (1021) is parallel to the first direction; The object carrying platform (101) is slidably connected to the linear magnetic track (1021) via a slider (1013); The mover (1022) is configured to drive the slider (1013) to slide along the linear magnetic track (1021) at the target acceleration, so as to drive the loading platform (101) to move along the first direction at the target acceleration.

5. The drop test equipment according to claim 4, characterized in that: The starting end (2012) of the circular turning track (201) is connected to the linear magnetic track (1021), and the terminal end (2013) is closer to the object carrying platform (101) relative to the starting end (2012) and is located on the same side of the linear magnetic track (1021) as the object carrying platform (101); The object to be tested that has separated from the object loading platform (101) falls into the circular turning track (201) and moves in a circular motion from the starting end (2012) to the terminal end (2013), and the object to be tested performs free fall acceleration motion along the second direction at the terminal end (2013).

6. The drop test equipment according to claim 5, characterized in that: The circular turning track (201) is a three-quarter circular structure; The tangent direction of the circular turning track (201) at the starting end (2012) is parallel to the first direction, and the tangent direction at the ending end (2013) is parallel to the second direction.

7. The drop test equipment according to claim 6, characterized in that: The radius of the circular turning track (201) , satisfying the following relationship: ， ； In the formula, is the acceleration due to gravity, is the final velocity of the object to be tested when it reaches the starting end (2012), is the target acceleration, is the accelerated displacement corresponding to the accelerated motion.

8. The drop test equipment according to claim 5, characterized in that: It also includes: a bracket (401) and a drop plate (402); The drop plate (402) is fixed on the bracket (401), and the bracket (401) is located on one side of the terminal end (2013), so that the drop plate (402) is arranged between the linear magnetic track (1021) and the terminal end (2013); The drop plate (402) is used to receive the object to be tested that is in free fall acceleration motion from the terminal end (2013) to perform a drop test.

9. The drop test equipment according to claim 8, characterized in that: The object speed and angle monitoring unit (300) comprises: a high-speed camera (301) and a base (302); The base (302) is located on a side of the object-carrying platform (101) that is away from the circular turning track (201), and the high-speed camera (301) is fixed on the base (302); The lens of the high-speed camera (301) faces the drop plate (402), and the high-speed camera (301) is configured to take a picture of the object to be tested falling onto the drop plate (402).

10. The drop test equipment according to claim 9, characterized in that: It also includes: a general control unit (500), wherein the general control unit (500) is connected to the acceleration device (102) and the high-speed camera (301) respectively; The overall control unit (500) is configured to control the acceleration device (102) to drive the object carrying platform (101) to accelerate along the first direction according to the target acceleration; The general control unit (500) is further configured to control the high-speed camera (301) to take a picture of the object to be tested falling onto the drop plate (402) at a photographing frame rate, and to determine the drop angle and drop speed of the object to be tested based on the picture.

11. The drop test equipment according to claim 10, characterized in that: Determine the falling speed according to the following formula: : ； In the formula, is the photographing frame rate of the high-speed camera (301), The value range is 1000 frames / second to 10000 frames / second; is the drop displacement of the object to be tested in the two pictures at the same position before falling.

12. A drop test method, characterized in that: Applied to the drop test device according to any one of claims 1 to 11, the method comprises: The object acceleration control unit (100) is controlled to drive the object to be tested to accelerate along a first direction according to a target acceleration, and the object to be tested that has completed the accelerated motion falls into the object angle conversion control unit (200), and the object angle conversion control unit (200) converts the motion direction of the object to be tested to a second direction, so that the object to be tested accelerates in free fall along the second direction and falls; the second direction is perpendicular to the first direction; The object speed and angle monitoring unit (300) is controlled to monitor the falling angle and falling speed of the object to be tested when it falls.

13. The drop test method according to claim 12, characterized in that: The object acceleration control unit (100) drives the object to be tested to accelerate along a first direction according to a target acceleration, comprising: The control acceleration device (102) drives the object platform (101) to accelerate along the first direction according to the target acceleration; after the object to be tested follows the object platform (101) to move to the starting end (2012) of the circular turning track (201), it leaves the object platform (101) and moves in a circular motion along the circular turning track (201) to the ending end (2013); the circular turning track (201) converts the movement direction of the object to be tested to a second direction, so that the object to be tested moves in a free fall accelerated motion along the second direction and falls onto the drop plate (402).

14. The drop test method according to claim 13, characterized in that: The object speed and angle monitoring unit (300) monitors the falling angle and falling speed of the object to be tested when it falls, including: Controlling a high-speed camera (301) to take a picture of the object to be tested falling onto the drop plate (402) at a photographing frame rate; According to the picture, the falling angle and falling speed of the object to be tested are determined.

15. The drop test method according to claim 14, characterized in that: Determining the falling speed of the object to be tested according to the picture includes: Obtain the two pictures of the same position before the fall; Determining the drop displacement of the object to be tested according to the position of the object to be tested in the two pictures; The falling speed of the object to be tested is determined according to the falling displacement.

16. The drop test method according to claim 15, characterized in that: Determine the falling speed according to the following formula: : ； In the formula, is the photographing frame rate of the high-speed camera (301), The value range is 1000 frames / second to 10000 frames / second; is the drop displacement of the object to be tested in the two pictures at the same position before falling.

17. The drop test method according to claim 14, characterized in that: Determining the falling angle of the object to be tested according to the picture includes: Determining the falling posture of the object to be tested according to the picture; The falling angle of the object to be tested is determined according to the falling posture of the object to be tested.

18. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program instructions, and when the program instructions are executed on a computer, the computer executes the drop test method according to any one of claims 12 to 17.

19. A control system, characterized in that: include: Memory and processor; The memory stores program instructions, and when the program instructions are executed by the processor, the control system executes the drop test method according to any one of claims 12 to 17.

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