Bending test device

Abstract

A bending test device belongs to the field of testing equipment for flexible devices and materials. The purpose of the present invention is to reduce the technical problem that the bending test fixture generates stress on the sample of the bending test during the bending process, resulting in poor test results and accuracy. The present invention includes a base, a support rod, a movable mounting plate, a fixed mounting plate, and a drive unit. The fixed mounting plate is fixedly mounted on the base, the movable mounting plate is rotatably connected to the fixed mounting plate, a slide rail is installed on the back of the movable mounting plate, the drive unit is installed with the support rod, and an articulated bearing seat is installed on the support rod through an articulated bearing. The articulated bearing seat cooperates with the slide rail through a slider to realize the rotation of the movable mounting plate relative to the fixed mounting plate. The present invention has an ingenious structure, is easy to operate, and is suitable for popularization and use.

Description

Technical Field

[0001] The invention relates to a bending test device, belonging to the field of testing equipment for flexible devices and materials. Background Art

[0002] Flexible displays are made of soft materials and can be bent. Flexible displays are widely used in portable electronic devices and mobile terminals due to their thinness, low power consumption and bendability. Since the bending resistance of flexible devices and materials directly affects the life of the display, it is necessary to test and evaluate the bending performance of flexible screens, film materials and physical models.

[0003] Traditional bending test equipment simulates the motion curve of the bending process of the sample under ideal conditions to make the guide rail to ensure that the motion curve during the bending test is the same as the actual situation, reducing the influence of external stress. Since the thickness, bending radius, bending shape and other factors of the test sample during the bending process have an impact on the motion curve of the bending process, and the guide rail of the test equipment is designed according to the simulation curve, it is necessary to replace the guide rail of the bending test to meet different bending test requirements.

[0004] At the same time, traditional bending test equipment often adopts the "hinge" bending test method, such as the publication number

[0005] The bending test device of CN209400335U has a motor, which is connected to the first support plate through the motor to drive the first support plate to rotate relative to the second support plate, and the motor is connected to the fixed shaft of the first support plate. This method of directly driving the fixed shaft to act on the support plate through the motor makes the motor torque directly act on the rotating shaft, and the fixed connection method adopted by the rotating shaft and the support plate causes a stress to be generated between the rotating shaft and the first support plate, and because multiple tests are required when performing bending tests, for example, the bending rate is 1 to 60 times / minute and the number of tests is 1 to 2000000 times. Under such multiple bending, the above stress cannot be effectively released and will eventually act on the test sample. The external stress acting on the test sample will eventually affect the test result of the test sample, resulting in inaccurate test results and causing the entire test process to lose the original meaning of the bending test.

[0006] To sum up, the existing guide rail bending test equipment has the problems of easy generation of external stress during the test process, inaccurate test results, poor versatility and low efficiency. Therefore, improving the bending test equipment, avoiding the generation of external stress during the test process, improving versatility, simplifying operations and improving test efficiency have become issues that need to be urgently addressed. Summary of the invention

[0007] The purpose of the present invention is to reduce the stress generated by the bending test fixture during the bending process on the sample of the bending test, resulting in poor test results and accuracy. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0008] The technical solution of the present invention:

[0009] A bending test device comprises a base, a support rod, a movable mounting plate, a fixed mounting plate, and a driving unit. The fixed mounting plate is fixedly mounted on the base, the movable mounting plate is rotatably connected to the fixed mounting plate, a slide rail is installed on the back of the movable mounting plate, the driving unit is installed on the support rod, a joint bearing seat is installed on the support rod through a joint bearing, and the joint bearing seat cooperates with the slide rail through a slider to realize the rotation of the movable mounting plate relative to the fixed mounting plate.

[0010] A bending test device includes a base, a support rod, a movable mounting plate, a fixed mounting plate, and a drive unit. The fixed mounting plate is fixedly mounted on the base, the movable mounting plate is rotatably connected to the fixed mounting plate, a slide rail is installed on the back of the movable mounting plate, a slider is installed on the slide rail, a joint bearing seat is installed on the slider, the support rod is installed in the joint bearing seat through the joint bearing, and the drive unit is installed on the support rod.

[0011] Preferably, the driving unit comprises a support seat and a power arm, the support seat is fixedly mounted on the base, one end of the power arm is mounted in the support seat via a bearing and a rotating shaft, and the other end of the power arm is fixedly mounted on the support rod.

[0012] Preferably, an electromagnet is installed on the fixed mounting plate, and a suction block is installed on the movable mounting plate.

[0013] Preferably: hinged plates are fixedly installed on both sides of the fixed mounting plate, and a first support shaft, a first slide and a second slide are arranged on the hinged plates; and a third slide matched with the first support shaft, a second support shaft matched with the first slide, and a third support shaft matched with the second slide are respectively arranged on the movable mounting plate.

[0014] Preferably, the hinge piece is a semicircular hinge piece, and the first support shaft is fixed at the center position of the semicircular hinge piece.

[0015] Preferably, the movable mounting plate and the fixed mounting plate are processed with two parallel long holes, and clamping strips are installed in the long holes.

[0016] Preferably, the slide rail is installed on the back side of the movable mounting plate along the moving direction of the movable mounting plate. After installation, the axis of the slide rail and the supporting rod are vertical in space.

[0017] The present invention has the following beneficial effects:

[0018] 1. The present invention outputs an electrical signal to the driving unit through the PLC control unit, and the driving unit drives the power arm to swing, drives the support rod connected to the power arm to follow the swing, and drives the joint bearing seat and the movable mounting plate to flip. The back of the movable mounting plate is provided with a slide rail, and the slider is adaptively installed on the slide rail. The slider is fixed on the joint bearing seat, and the support rod passes through the joint bearing and is installed on the bearing seat;

[0019] 2. The present invention can completely simulate the bending process in actual application by moving the guide rail and rotating the joint bearing, so that the test sample can be tested without the influence of external stress;

[0020] 3. In the actual test process of the present invention, after setting the sample parameters and test requirements, the movable mounting plate moves along the sliding guide rail to adjust the position during the bending process, and the angle is adjusted by rotating around the support rod, so the position and angle are adjusted from multiple dimensions, which completely simulates the actual application state, ensuring that the sample will not be affected by external stress during the test. At the same time, the joint bearing can cause the movable mounting plate to produce a slight twist to prevent stress from being generated during the bending process.

[0021] 4. The fixture of the present invention can be clamped on the fixed mounting plate and the movable mounting plate by the clamping strip, and different test requirements can be met by replacing different Mockups / fixtures. It has adaptive capabilities for Mockups / fixtures of different thicknesses, avoiding the verification operation after removing and replacing the mounting plate, and improving the versatility and ease of operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a stereogram of a bending test device;

[0023] Figure 2 It is a three-dimensional diagram of the spherical plain bearing seat;

[0024] Figure 3 It is a three-dimensional installation diagram of a fixed mounting seat and a movable mounting seat;

[0025] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0026] Figure 5 yes Figure 3 The enlarged view of point B in the middle;

[0027] Figure 6It is a schematic diagram of the installation relationship of the clamping strip on the fixed mounting seat;

[0028] Figure 7 It is an enlarged schematic diagram of the spherical bearing seat at the movable mounting plate;

[0029] In the figure, 1-base, 2-support seat, 3-power arm, 4-support rod, 5-joint bearing, 6-joint bearing seat, 7-electromagnet, 8-suction block, 9-slide rail, 10-movable mounting plate, 11-clamping strip, 12-fixed mounting plate, 13-slider, 14-Mockup / jig, 15-drive unit, 16-hinge plate, 17-first support shaft, 18-first slideway, 19-second slideway, 20-third slideway, 21-second support shaft, 22-third support shaft, 23-long hole. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0031] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection (i.e., non-detachable connection) includes but is not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but is not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0032] Specific implementation method 1: refer to Figure 1-Figure 7The present embodiment is described. A bending test device of the present embodiment includes a base 1, a support rod 4, a movable mounting plate 10, a fixed mounting plate 12, and a driving unit 15. The fixed mounting plate 12 is fixedly mounted on the base 1, the movable mounting plate 10 is rotatably connected to the fixed mounting plate 12, a slide rail 9 is mounted on the back of the movable mounting plate 10, a slider 13 is mounted on the slide rail 9, a joint bearing seat 6 is mounted on the slider 13, the support rod 4 is mounted in the joint bearing seat 6 through the joint bearing 5, the driving unit 15 is installed with the support rod 4, wherein a PLC control unit and a driving unit are arranged in the base 1, the mockup 14 represents a foldable solid model, and the fixture 14 represents a test fixture for bending flexible membranes. The driving unit 15 can be a servo motor, and a power arm 3 is installed at the output end of the driving unit 15. A support rod 4 is fixedly installed on the power arm 3. A joint bearing seat 6 is installed on the support rod 4 through a joint bearing 5. The joint bearing seat 6 cooperates with the slide rail 9 through a slider 13. The power arm 3 rotates to drive the support rod 4 to move, thereby realizing the rotation of the movable mounting plate 10 relative to the fixed mounting plate 12.

[0033] Combination Figure 1 , Figure 2 Description: Two relatively arranged support seats 2 are installed on the base, and a power arm 3 is installed on the inner side of each support seat 2 through a rotating shaft and a bearing, a support rod 4 is connected between the two power arms 3, and a joint bearing seat 6 is installed on the back of the movable mounting plate 10. The support rod 4 passes through the joint bearing 5 and is installed in the joint bearing seat 6, and is rotatably connected through the joint bearing. To ensure the flexibility of the rotational connection between the support rod 4 and the joint bearing seat 6, preferably, each movable mounting plate 10 is provided with one joint bearing 5, which is arranged in the central position on the back of the movable mounting plate 10, so that the joint bearing seat 6 can be slightly twisted with the support rod 4, and can also be rotated around the support rod 4, and the fixed mounting plate 12 is installed and fixed on the base 1; with such a configuration, the support rod 4 and the joint bearing seat 6 are installed in a matching relationship through the joint bearing 5, and when the driving unit drives the power arm 3 to rotate, the power arm 3 drives the movable mounting plate 10 to complete the rotation action.

[0034] Specific implementation method 2: refer to Figure 1-Figure 7, Specific implementation mode 1, describes this implementation mode, a bending test device of this implementation mode, the movable mounting plate 10 and the fixed mounting plate 12 are processed with two parallel long holes 23, and the clamping strip 11 is installed in the long hole 23, and the clamping strip 11 is installed on both the movable mounting plate 10 and the fixed mounting plate 12. In this way, long holes are opened on the movable mounting plate 10 and the fixed mounting plate 12, and the clamping strip 11 passes through the long holes 23 by bolts and is respectively installed on the movable mounting plate 10 and the fixed mounting plate 12. The purpose of setting the long holes is to make the fixed position of the clamping strip 11 adjustable, that is, the fixed position of the clamping strip 11 can be adjusted according to the size of the Mockup / jig 14, so that the Mockup / jig 14 can be ensured to be stably fixed between the movable mounting plate 10 and the fixed mounting plate 12, and the simple replacement of the Mockup / jig 14 improves the overall versatility and ease of operation of the equipment.

[0035] Preferably, in order to prevent hard friction between the clamping strip 11 and the Mockup / jig 14, a rubber or plastic backing protective layer is provided on the clamping strip 11; preferably, in order to ensure the stability between the clamping strip 11 and the Mockup / jig 14, the end surface of the clamping strip may be ◤ or " shaped.

[0036] Specific implementation method three: refer to Figure 1-Figure 7 , describing this embodiment, a bending test device of this embodiment, the slide rail 9 is installed on the back of the movable mounting plate 10 along the movement direction of the movable mounting plate 10. After installation, the slide rail 9 and the axis of the support rod 4 are vertical in space, and a slide rail 9 along the movement direction is installed on the back of each movable mounting plate 10. The purpose of setting the slide rail 9 is to ensure the stability of the movement between the movable mounting plate 10 and the joint bearing seat 6. A slider 13 is installed on the slide rail 9, and the slider 13 can slide along the slide rail 9 without detaching. A joint bearing 5 is arranged on the joint bearing seat 6, so that when the joint bearing seat 6 drives the movable mounting plate 10 to move, a slight torsion is allowed to be generated, and the position of the movable mounting plate 10 is adjusted to prevent stress from being generated during the bending process; preferably, the slide rail 9, the slider 13, the joint bearing 5, and the joint bearing seat 6 are arranged in the middle position of the movable mounting plate, which can better ensure uniform force and rotation flexibility.

[0037] Specific implementation method 4: refer to Figure 1-Figure 7, describing the present embodiment, a bending test device of the present embodiment, the fixed mounting plate 12 is mounted with an electromagnet 7, the movable mounting plate 10 is mounted with a suction block 8, the bottom end surface of the fixed mounting plate 12 is mounted with an electromagnet 7, the movable mounting plate 10 is mounted with a suction block 8, the suction block 8 cooperates with the electromagnet 7 to be attracted; when the electromagnet 7 is energized, the fixed mounting plate 12 and the movable mounting plate 10 will be in the same plane under the action of the magnetic force of the electromagnet 7, and will be firmly attracted together, so as to facilitate the installation of the sample to be tested.

[0038] Specific implementation method five: refer to Figure 1-Figure 7 , describing the present embodiment, a bending test device of the present embodiment, wherein hinged plates 16 are fixedly installed on both sides of the fixed mounting plate 12, and a first support shaft 17, a first slide 18 and a second slide 19 are arranged on the hinged plate 16, and a third slide 20 adapted to the first support shaft 17, a second support shaft 21 adapted to the first slide 18, and a third support shaft 22 adapted to the second slide 19 are arranged on the movable mounting plate 10. In order to ensure the guide rail designed according to the free bending curve of the flexible screen and membrane material without the influence of external stress, the motion trajectory is controlled by three guide rails, wherein the first motion trajectory is formed by the third slide 20 adapted to the first support shaft 17, the second motion trajectory is formed by the second support shaft 21 adapted to the first slide 18, and the third motion trajectory is formed by the second slide 19 and the third support shaft 22. The first slide 18 and the second slide 19 are both arc slides, and the second support shaft 21 and the third support shaft 22 are fixed on the movable mounting plate 10. The second support shaft 21 and the third support shaft 22 slide synchronously on the first slide 18 and the second slide 19. Under the cooperation of the two support shafts and the two slides, the sliding trajectory of the movable mounting plate 10 relative to the fixed mounting plate 12 is consistent, and the sliding is smooth, so that the running trajectory of the bending process of the test material is completely consistent with the free bending curve, and the movement process will not produce pulling and squeezing stress on the test material.

[0039] Further optimization, the fixture 14 is designed based on the free bending curve of the test sample without the influence of external stress, and the movement trajectory of the test material is completely consistent with the free bending curve, and the movement process will not generate pulling and squeezing stress on the test material.

[0040] The working process and operation process are as follows:

[0041] When the above-mentioned bending test equipment is actually used, if the test sample is a flexible screen or film material, first select the jig 14 according to the bending shape (U-shaped or teardrop-shaped), bending radius (0.1~50mm), and material thickness (0.05~10mm), install the test sample on the jig 14, and install the jig 14 on the movable mounting plate 10 and the fixed mounting plate 12 through the clamping strip 11.

[0042] When the bending test device is actually used, if the test sample is a rigid and foldable mockup entity model, the mockup 14 is first mounted on the movable mounting plate 10 and the fixed mounting plate 12 through the clamping strip 11 according to the thickness of the test sample (6-20 mm).

[0043] Then turn on the power switch, set the test requirements (the value range of the fixture or physical model thickness h is 1~100mm, the starting angle is 0~180º, the final angle is 0~180º, the bending rate is 1~60 times / minute, and the number of tests is 1~2000000 times), start the test, and drive the servo motor to drive the movable mounting plate 10 through the power arm 3 and the support rod 4 to perform the bending test according to the set bending angle, bending rate, bending radius, and bending number. The test is carried out according to the design requirements of the stress-free motion curve under the ideal state. The joint bearing 5 is connected to avoid stress effects. The display screen displays and records the number of completed bends, the remaining number of bends, and the remaining time required to complete the experiment. During the test, the protective cover is used to isolate the running test station. The bending test situation can be observed through the protective cover. The device can also be paused by pressing the pause button in the touch screen at any time to observe in a static state. If a fault occurs during the test or the emergency stop switch is pressed, the controller in the touch screen will start the emergency stop mode and send out an alarm signal. After the operator has completed the process and confirmed the reset operation on the touch screen, the equipment can be restarted. The operator can choose to keep the previous operation data and continue the test or delete the historical accumulated data and retest. After the test is completed, the touch screen will issue a prompt to notify the operator.

[0044] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0045] This implementation is only an exemplary description of this patent and does not limit its protection scope. Those skilled in the art may also make partial changes to it, as long as they do not exceed the spirit of this patent, they are all within the protection scope of this patent.

Claims

1. A bending test device, comprising a base (1), a support rod (4), a movable mounting plate (10), a fixed mounting plate (12), and a drive unit (15), wherein the fixed mounting plate (12) is fixedly mounted on the base (1), and the movable mounting plate (10) is rotatably connected to the fixed mounting plate (12), characterized in that: A slide rail (9) is installed on the back of the movable mounting plate (10), the drive unit (15) is installed with the support rod (4), a joint bearing seat (6) is installed on the support rod (4) through a joint bearing (5), and the joint bearing seat (6) cooperates with the slide rail (9) through a slider (13) to realize the rotation of the movable mounting plate (10) relative to the fixed mounting plate (12); the slide rail (9) is installed on the back of the movable mounting plate (10) along the movement direction of the movable mounting plate (10), and after installation, the axis of the slide rail (9) and the support rod (4) are in a vertical state in space; the slide rail (9), the slider (13), the joint bearing (5), and the joint bearing seat (6) are arranged in the middle position of the movable mounting plate (10).

2. A bending test device according to claim 1, characterized in that: The driving unit (15) comprises a support seat (2) and a power arm (3); the support seat (2) is fixedly mounted on the base (1); one end of the power arm (3) is mounted in the support seat (2) via a bearing and a rotating shaft; and the other end of the power arm (3) is fixedly mounted on the support rod (4).

3. A bending test device according to claim 1, characterized in that: An electromagnet (7) is mounted on the fixed mounting plate (12), and a suction block (8) is mounted on the movable mounting plate (10).

4. A bending test device according to any one of claims 1 to 3, characterized in that: Hinge plates (16) are fixedly mounted on both sides of the fixed mounting plate (12), and a first support shaft (17), a first slideway (18) and a second slideway (19) are arranged on the hinge plates (16); a third slideway (20) matched with the first support shaft (17), a second support shaft (21) matched with the first slideway (18), and a third support shaft (22) matched with the second slideway (19) are respectively arranged on the movable mounting plate (10).

5. A bending test device according to claim 4, characterized in that: The hinge plate (16) is a semicircular hinge plate, and the first support shaft (17) is fixed at the center position of the semicircular hinge plate.

6. A bending test device according to claim 1 or 3, characterized in that: The movable mounting plate (10) and the fixed mounting plate (12) are machined with two parallel long holes (23), and clamping strips (11) are installed in the long holes (23).

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