Drop ball test device and test method

Abstract

The present invention discloses a drop ball test device and a test method. The test device comprises a clamp (2) capable of grasping or releasing a test ball (1). An anti-fall mechanism (4) is provided on the falling path of the test ball for preventing the test ball from rebounding after impact. The anti-fall mechanism can support the test ball when it rebounds after impact, thereby preventing it from hitting the object to be tested a second time. The drop ball test device of the present invention can prevent the test ball from hitting the object to be tested a second time by supporting the rebounded test ball with a rising tray, thereby ensuring the accuracy of the test.

Description

Technical Field

[0001] The present invention belongs to the technical field of automation equipment, and in particular relates to a falling ball testing device and a falling ball testing method. Background Art

[0002] A drop test, also known as a drop test, involves dropping a ball of specified weight onto a product from a specified height to impact it, thereby inspecting various aspects of its performance. This method is commonly used to test products such as plastics and glass. Especially with the widespread popularity of large-screen smartphones, impact testing of mobile phone screens is crucial.

[0003] The existing drop ball testers all use manual loading and manual height adjustment, resulting in a low test rate. In addition, in order to prevent the test ball from rebounding and causing a secondary impact, the existing tests all use a rope to tie the test ball and manually drag it to prevent it from rebounding, which is prone to errors and has low test efficiency. Summary of the Invention

[0004] The main technical problem solved by the present invention is to provide a falling ball testing device, which prevents the test ball from hitting the object to be tested for the second time through an automated device, thereby ensuring the test accuracy.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is as follows:

[0006] A falling ball testing device includes a clamp capable of grabbing or releasing a test ball, and an anti-fall mechanism is provided on the falling path of the test ball to prevent the test ball from rebounding after impact;

[0007] The anti-fall mechanism includes a tray that can move along the Z axis, the tray is located above the object to be tested, and the tray has a through hole. When the test ball falls, its lower end can pass through the through hole and hit the object to be tested.

[0008] Furthermore, the clamping jaws and the tray are both mounted on a marble base (22) via linear slide rails, and the linear slide rails are used to form a reciprocating motion along the Z-axis direction, and the tray is located below the clamping jaws.

[0009] Furthermore, a pad is provided at the mouth of the through-hole, and the portion where the pad contacts the test ball is an arc surface that matches the test ball.

[0010] Furthermore, when the falling test ball hits the object to be tested, the distance between the test ball and the hole is 1.5-3 mm.

[0011] Furthermore, when the falling test ball hits the object to be tested, the distance between the test ball and the hole is 2 mm.

[0012] Furthermore, a sensor for detecting the position of the test ball is provided;

[0013] The sensor includes a first sensor (42) provided at the position of the clamping jaw;

[0014] Alternatively, the sensor includes the first sensor (42) and a second sensor located at the tray position.

[0015] The present invention also provides a falling ball testing method, wherein when the test ball falls and hits the object to be tested and then rebounds, the tray rises to support the test ball, thereby preventing the test ball from forming a secondary impact on the object to be tested.

[0016] Furthermore, a first sensor is provided at the position of the clamping jaw, and the starting time of the falling of the test ball is acquired by the first sensor.

[0017] Furthermore, the starting time of the tray rising is obtained by calculating the falling time of the test ball. The calculation formula for the time required for the test ball to fall and hit the object to be tested is:

[0018]

[0019] Where H is the drop height of the test ball, and g=9.8m / s².

[0020] Furthermore, the distance the tray rises is ≤ the height at which the test ball rebounds.

[0021] Beneficial effects of the present invention:

[0022] This test device can perform automated testing through the anti-fall mechanism, and is also equipped with an anti-rebound mechanism to prevent secondary rebound, which can accurately and quickly perform drop ball testing (drop testing).

[0023] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the falling ball test device of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the clamping claw and anti-falling mechanism in the falling ball testing device of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the anti-fallback mechanism in the present invention;

[0027] Figure 4 This is a schematic diagram of the clamping and dropping of the test ball in the present invention;

[0028] Figure 5 This is a schematic diagram of the present invention when the test ball hits the object to be tested;

[0029] Figure 6 This is a schematic diagram of the present invention when the test ball is supported by the anti-fall mechanism after impact and rebound;

[0030] The parts in the accompanying drawings are marked as follows:

[0031] Test ball 1;

[0032] Gripper 2, linear guide rail 21, marble base 22, screw assembly 23, U-shaped linear motor 24;

[0033] Carrier 3, tray 41, opening 411, support plate 412, first sensor 42;

[0034] Anti-fall mechanism 4, detection camera 5;

[0035] Measured object 9. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention. Example

[0037] A falling ball test device, such as Figure 1 As shown: it includes a clamping claw 2 that can grab or release the test ball 1, and the clamping claw can reciprocate along the Z-axis direction to adjust the height of the falling ball. An anti-falling mechanism 4 is provided on the falling path of the test ball to prevent the test ball from rebounding after impact. The anti-falling mechanism can support the test ball when it bounces after impact to prevent it from hitting the object to be tested for the second time.

[0038] like Figure 1 and Figure 2 As shown: the carrier 3 for clamping the object to be tested 9 is located below the test ball, the carrier and / or the clamping claw can move along the X-axis and / or the Y-axis, and the anti-fallback mechanism is located between the object to be tested and the clamping claw;

[0039] In this embodiment, the movement of the X axis is achieved by the movement of the gripper, and the movement of the Y axis is achieved by the movement of the stage;

[0040] In more detail, the linear motion of the X-axis and the Y-axis are both achieved through linear guides, and each is separately provided with a driving member to drive its motion. It can be understood that this combination of the present embodiment is only one embodiment. Its essence is to adjust the position of the falling ball through the movement of the X-axis and the Y-axis so that it can fall on a specified point (on the object to be measured), and the movement of the X-axis and the Y-axis also includes the above-mentioned multiple combinations.

[0041] like Figure 2 and Figure 3 As shown: the anti-fallback mechanism includes a tray 41 that can move along the Z axis, the tray is located above the object to be tested, and the tray has a through-hole 411. When the test ball falls, its lower end can pass through the through-hole and hit the object to be tested; in this embodiment, the tray is composed of two supporting plates 412, and both of the two supporting plates have arc openings.

[0042] In addition, a pad is provided at the mouth of the hole, and the part where the pad contacts the test ball is an arc surface that matches the test ball. In this embodiment, the pad is made of PU material with a hardness of 50°. The non-metallic material can reduce the wear on the test ball and prevent damage caused by abnormal collision between the two, and at the same time has high hardness and rigidity.

[0043] In order to ensure the accuracy of the falling position of the falling ball in this embodiment, the clamping jaw and the tray are both mounted on a marble base 22 via a linear slide 21. The marble base can provide better rigidity. The two constitute a reciprocating motion along the Z-axis direction through the same set of linear slides, and have good position accuracy. The tray is located below the clamping jaw, and both are provided with independent driving parts. The clamping jaw is driven by a screw assembly 23, and the tray is driven by a U-shaped linear motor 24.

[0044] The device is also provided with a sensor for detecting the position of the test ball. The position of the test ball is detected by the sensor, thereby controlling the movement of each component. The sensor can be set in two ways:

[0045] The sensors include a first sensor 42 provided at the gripper position and a second sensor provided at the tray position;

[0046] The sensor includes a first sensor 42 provided at the position of the clamping jaw;

[0047] The first method is easy to understand. The first sensor detects the test ball falling, and the second sensor detects the test ball entering the landing point. Then the anti-fall mechanism is activated to support the test ball that rebounds after the impact to prevent a secondary impact.

[0048] This embodiment preferably adopts the second prevention method, which only monitors the falling time of the test ball, that is, the time when it leaves the clamping jaw, by the first sensor, and calculates the time of its impact. In this embodiment, the first sensor is a through-beam photoelectric sensor, which senses the test ball through the through hole 25 provided in the clamping jaw;

[0049] The calculation formula for the time required for the test ball to fall is:

[0050]

[0051] Where H is the falling height, g=9.8m / s²;

[0052] Assuming the test height is 10 cm, according to the above formula, the time from the test ball falling to the impact is 0.14 s;

[0053] This device Figure 1 As shown, a detection camera 5 is also provided, which can adjust the position of its lens to align with the object to be tested to obtain the impact status of the object to be tested. In more detail, if the object is not broken after impact, the test will continue; if a certain point is broken after impact, the test will be stopped.

[0054] In addition, a high-speed camera (not shown) is provided, the lens of which is facing the object to be tested to record the impact process. Because a high-speed camera is used, the broken state during the test can be recorded for retrospective analysis.

[0055] The specific test steps of this device are as follows Figures 4 to 6 As shown:

[0056] like Figure 4 As shown: First, a test ball 1 (an acrylic ball weighing 158g is used in this embodiment) is loaded into the clamping jaw 2. At this time, the clamping jaw is moved along the Z axis to a height of 10cm (that is, the distance between the test ball and the object to be tested is 10cm). The object to be tested 9 (in this embodiment, the object to be tested is a mobile phone glass panel) is loaded onto the carrier 3. The X-axis position of the clamping jaw and the Y-axis position of the carrier are adjusted by setting so that the test ball can fall to the specified point;

[0057] At this time, the tray is located close to the object to be tested, as shown in the following example. Figure 5 As shown: , this position is: when the falling test ball hits the object to be tested, the distance L between the test ball and the hole is 1.5-3 mm. In this embodiment, the distance L is 2 mm;

[0058] like Figures 5 to 6 As shown: the clamping jaws are released, and the test ball falls and hits the object to be tested. Because there is a gap between the test ball and the tray during the collision, the tray at this time will not affect the collision;

[0059] The first sensor detects the start time of the fall. According to the above formula, it can be calculated that the time from the fall to the impact of the test ball is 0.14s. After the impact, the tray rises, and the falling ball at this time will also rise due to rebound. When it rises to the highest point for the second time and falls again, it can be supported by the tray (the distance L when supporting the test ball is 0), thereby achieving the function of preventing secondary impact.

[0060] What needs to be verified here is that the time for the test ball to rise and fall twice is actually very short. Therefore, we used only one sensor to control the movement of the device through calculation. If two sensors were used, higher-precision and higher-sensitivity sensors and drive units would be required.

[0061] We know from the test that the rebound height of the test ball in the 10cm impact test is 1cm. Using the above formula, we can calculate that the second drop time of the test ball is 0.045s.

[0062] The time for the tray in this device to move 1 cm upward by the linear motor is 0.06 s, and the time for the test ball to rebound and rise + fall twice after impact can be approximately determined as 0.045*2=0.09 s. It can be seen that 0.6<0.9, so the anti-rebound device of this device can be fully implemented in theory; and this device can also be implemented through actual tests.

[0063] After the test ball hits the object, the detection camera 5 obtains the state of the object to be tested. If it is broken, the test is stopped. If it is not broken, the tray moves upward (upward on the Z axis), and the test ball is sent into the gripper 2 to repeat the ball drop test.

[0064] It should be noted here that the height of the test ball in the drop ball test is not fixed. The above embodiment lists a height of 10 cm. In actual testing, the height increases from height X1 (for example, 10 cm) to height X2 (for example, 50 cm). The calculation formula after the height changes is the same.

[0065] In addition, there is a certain time interval between the impact and rebound of the test ball, that is, the impact will have a duration, which is very short. Through multiple tests, the time is 0.015s. Adding this time, the tray will have more time to rise, which is enough to rise to support the test ball.

[0066] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship described in the embodiments and shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0067] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied to other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A falling ball test device, characterized in that: It comprises a clamping claw (2) capable of grasping or releasing a test ball (1), and an anti-falling mechanism (4) is provided on the falling path of the test ball for preventing the test ball from rebounding after impact; The anti-fallback mechanism comprises a tray (41) capable of moving along the Z axis, the tray being located above the object to be tested, and the tray having a through-hole (411), through which the lower end of the test ball can pass when the test ball falls and hit the object to be tested; when the falling test ball hits the object to be tested, the distance L between the test ball and the through-hole is 1.5-3 mm; The device is also provided with a detection camera (5), which can adjust the position of its lens to align with the object to be tested. After the test ball hits the object, the state of the object to be tested is obtained through the detection camera (5). If it is broken, the test is stopped. If it is not broken, the tray moves upward along the Z axis, and the test ball is sent into the clamping claw (2), and the ball drop test is repeated. The clamping jaw and the tray are both mounted on a marble base (22) via a linear slide rail (21), and the linear slide rail is used to form a reciprocating motion along the Z-axis direction, and the tray is located below the clamping jaw; The mouth of the hole is provided with a pad, and the portion where the pad contacts the test ball is a curved surface that matches the test ball; A sensor for detecting the position of the test ball is also provided; The sensor includes a first sensor (42) provided at the position of the clamping jaw; Alternatively, the sensor includes the first sensor (42) and a second sensor located at the tray position.

2. The falling ball test device according to claim 1, characterized in that: When the falling test ball hits the object to be tested, the distance L between the test ball and the hole is 2 mm.

3. A falling ball test method, characterized in that: It adopts the falling ball test device according to any one of claims 1 to 2. When the test ball falls and hits the object to be tested and then rebounds, the tray rises to support the test ball, thereby preventing the test ball from forming a secondary impact on the object to be tested.

4. The falling ball test method according to claim 3, wherein: The starting time of the falling of the test ball is acquired by the first sensor.

5. The falling ball test method according to claim 3 or 4, characterized in that: The starting time of the tray rising is obtained by calculating the duration of the test ball falling. The calculation formula for the time required for the test ball to fall and hit the object to be tested is: ； Wherein, H is the drop height of the test ball, in meters; g=9.8m / s².

6. The falling ball test method according to claim 3, wherein: The distance the tray rises is ≤ the height at which the test ball rebounds.

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