Fatigue testing device for rotating shaft of folding screen

Abstract

The invention relates to testing, in particular to the technical field of rotating shaft fatigue detection, and discloses a folding screen rotating shaft fatigue testing device which comprises a pressure testing machine, a feeding part is arranged on the pressure testing machine, a water drop rotating shaft is arranged on the feeding part, and a fatigue testing part is installed on the feeding part. The fatigue testing part is provided with an impact testing part, the pressure testing machine is provided with a movable pressure head, the movable pressure head is provided with a detection part, the feeding part comprises a bracket, the bracket is arranged on a table top of the pressure testing machine, the bracket is fixedly connected with a feeding table, the feeding table is provided with a positioning hole, and the positioning hole is arranged on the feeding table. The feeding table is of an annular structure, the positioning holes are formed in the feeding table in a circle center array mode, fatigue opening and closing and falling impact testing are integrated, the problem that traditional equipment can only simulate singly and cannot reproduce core damage scenes in actual use is solved, and the testing result better fits the actual use condition.

Description

Technical Field

[0001] This invention relates to testing, specifically to the field of hinge fatigue testing technology, and more specifically to a foldable screen hinge fatigue testing device. Background Technology

[0002] With the deep integration of mobile communication and display technologies, foldable screen devices have become a core innovation direction in the consumer electronics field. Leveraging their dual advantages of large-screen display and portable folding, they have rapidly captured a significant share of the mid-to-high-end market. The hinge mechanism, as a core functional component of foldable screen devices, directly determines the device's folding lifespan, user experience, and structural stability, making it a key indicator of product competitiveness. Against this backdrop, new precision hinge technologies, such as the teardrop hinge and the keel hinge, have emerged.

[0003] However, in the pursuit of precision and lightweight design, new hinge technologies also face significant structural strength challenges. The teardrop hinge reduces folding gaps through a biomimetic teardrop shape design. Its rotating joints employ a nested structure of multiple micro-links and elastic components, leading to prominent stress concentration and a significant reduction in shock-absorbing space. The keel hinge, on the other hand, uses an array-type keel support as its core load-bearing structure, achieving rigid support through composite molding of metal and composite materials. While this solves the deformation problem of traditional hinges, the flexible connections between the supports, designed to meet folding requirements, employ an ultra-thin elastic sheet structure, inherently lacking in impact resistance.

[0004] Currently, most testing devices for foldable screen hinges in the industry focus on cyclic folding fatigue testing, simulating tens of thousands of opening and closing actions to verify the hinge's lifespan. However, these devices generally lack the ability to simulate combined conditions such as drop impacts and fatigue accumulation, and cannot accurately reproduce the hinge damage process in actual use. Existing impact testing equipment mostly uses free-fall methods, which can only achieve impact loading at a single height and in a single posture, making it difficult to simulate the multi-angle and multi-force drop scenarios commonly encountered by users. Furthermore, after testing, the damage to the hinge can only be judged by visual inspection, and it is impossible to capture the internal stress changes and micro-damage accumulation patterns during the impact process. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a fatigue testing device for foldable screen hinges. This device solves the problem that existing technologies, such as teardrop hinges and keel hinges, lack the ability to simulate the combined conditions of drop impact and fatigue accumulation in actual use, and cannot accurately reproduce the damage process of hinges in actual use.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a folding screen hinge fatigue testing device, comprising a pressure testing machine, wherein the pressure testing machine is provided with a feeding part, the feeding part is provided with a water droplet hinge, the feeding part is installed with a fatigue testing part, the fatigue testing part is installed with an impact testing part, the pressure testing machine is provided with a movable pressure head, and the movable pressure head is installed with a detection part.

[0007] Preferably, the feeding part includes a support, which is installed on the table of the pressure testing machine. A feeding platform is fixedly connected to the support, and a positioning hole is provided on the feeding platform.

[0008] Preferably, the loading platform is a ring structure, the positioning holes are arranged in a circular array on the loading platform, and the water droplet rotating shaft is arranged on the loading platform and installed on the positioning holes by bolts.

[0009] Preferably, the fatigue testing unit includes a Z-shaped arm, which is mounted on a loading platform. One end of the Z-shaped arm is equipped with a motor and rotatably connected to two rotating shafts. The output shaft of the motor is fixedly connected to one of the rotating shafts. Gears are fitted on both rotating shafts and mesh with each other. Adjusting arms are fixedly fitted on both rotating shafts. Heating plates and support rods are mounted on the adjusting arms. Support arms are rotatably connected to the ends of both adjusting arms.

[0010] Preferably, the two adjusting arms, heating elements, support rods, and support arms are arranged symmetrically to each other, the two bearing members on both sides of the water droplet rotating shaft are in contact with the support rods at corresponding positions, and the two structural connecting plates on both sides of the water droplet rotating shaft are in contact with the heating elements at corresponding positions.

[0011] Preferably, there are two fatigue testing units, both of which are installed on the loading platform and are arranged symmetrically between each other.

[0012] Preferably, the impact testing unit includes four L-shaped arms, which are symmetrically mounted on the loading platform in pairs. Each L-shaped arm has a sliding hole, and a rotating rod is slidably connected in each sliding hole. A base is movably mounted between the four rotating rods. Limiting grooves are provided on both sides of the base. A sliding rod is slidably connected to the base, and an impact head is fixedly connected to each sliding rod. A spring is elastically connected between the impact head and the base.

[0013] Preferably, the base is slidably connected to the Z-shaped arms in the two fatigue testing sections through a limiting groove, and the ends of the arms in the two fatigue testing sections are sleeved on the rotating rods at corresponding positions.

[0014] Preferably, the detection unit includes a groove, which is formed on the movable pressure head. A housing is installed on the inner wall of the groove. A wire hole communicating with the housing is formed on the movable pressure head. A rod hole is formed on the movable pressure head. A slide rod is slidably connected in the rod hole. A pressure plate is fixedly connected to the end of the slide rod. A spring is elastically connected between the pressure plate and the movable pressure head. An ultrasonic host is installed on the pressure plate. A phased array probe is provided on the ultrasonic host.

[0015] Preferably, the pressure plate contacts the adjusting arms in the two fatigue testing sections respectively, and the phased array probe contacts the core force-bearing component of the water droplet rotating shaft.

[0016] (III) Beneficial Effects Compared with the prior art, the present invention provides a fatigue testing device for foldable screen hinges, which has the following beneficial effects: 1. This foldable screen hinge fatigue testing device integrates fatigue opening and closing tests with drop impact tests, solving the problem that traditional equipment can only simulate a single scenario and cannot reproduce the core damage scenarios in actual use. The test results are more in line with real-world usage.

[0017] 2. The folding screen hinge fatigue testing device adopts dynamic linkage between the detection unit and the fatigue testing unit, which not only realizes full-cycle tracking of internal damage of the hinge, but also protects the phased array probe by staggering the impact action, avoiding damage to the detection equipment and improving the continuity and economy of testing.

[0018] 3. This folding screen hinge fatigue testing device uses high-temperature environment simulation and parameter adjustment of different impact forces and opening and closing frequencies to adapt to the testing needs of various precision hinges such as water droplet hinges and keel hinges, and has strong versatility.

[0019] 4. This foldable screen hinge fatigue testing device uses phased array ultrasonic testing technology to capture hidden damage such as micron-level microcracks and internal porosity, and generate visualized grayscale images, providing accurate data support for hinge structure optimization and helping to improve product reliability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a folding screen hinge fatigue testing device proposed in this invention; Figure 2 This is a diagram showing the assembly of the pressure testing machine and the moving pressure head of the present invention; Figure 3 This is a schematic diagram of the loading platform of the present invention; Figure 4 This is a diagram showing the fit between the water droplet rotating shaft and the fatigue testing section of the present invention; Figure 5 This is a diagram showing the assembly of the loading platform and the water droplet rotating shaft of the present invention; Figure 6This is a diagram showing the assembly of the loading platform and the impact testing unit of the present invention. Figure 7 This is a diagram showing the assembly of the fatigue testing section and the impact testing section of the present invention. Figure 8 This is a schematic diagram of the fatigue testing section of the present invention; Figure 9 This is a schematic diagram of the phased array probe of the present invention; Figure 10 This is a schematic diagram of the chassis of the present invention.

[0021] In the diagram: 1. Pressure testing machine; 2. Feeding section; 21. Support; 22. Feeding platform; 23. Positioning hole; 3. Water droplet rotating shaft; 4. Fatigue testing section; 41. Z-arm; 42. Motor; 43. Rotating shaft; 44. Gear; 45. Adjusting arm; 46. Heating plate; 47. Support rod; 48. Support arm; 5. Impact testing section; 51. L-arm; 52. Sliding hole; 53. Rotating rod; 54. Base; 55. Limiting groove; 56. Impact head; 57. Spring 1; 6. Moving pressure head; 7. Detection section; 71. Groove; 72. Chassis; 73. Wire hole; 74. Rod hole; 75. Pressure plate; 76. Spring 2; 77. Ultrasonic main unit; 78. Phased array probe. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1 - Figure 10 This invention provides a fatigue testing device for a folding screen hinge, comprising a pressure testing machine 1, a feeding section 2 on the pressure testing machine 1, a water droplet hinge 3 on the feeding section 2, a fatigue testing section 4 mounted on the feeding section 2, an impact testing section 5 mounted on the fatigue testing section 4, a movable pressure head 6 on the pressure testing machine 1, and a detection section 7 mounted on the movable pressure head 6. The movable pressure head 6 can slide up and down to adjust the detection height, and in conjunction with phased array ultrasonic testing, ensures the sound wave coupling effect, providing a basic condition for non-destructive testing.

[0024] In this invention, the loading section 2 provides a precise and stable installation reference, including a support 21. The support 21 is installed on the table of the pressure testing machine 1, and a loading platform 22 is fixedly connected to the support 21. The loading platform 22 has positioning holes 23. The loading platform 22 has a ring structure, and the positioning holes 23 are arranged in a circular array on the loading platform 22. The water droplet rotating shaft 3 is set on the loading platform 22 and installed in the positioning holes 23 by bolts. Through the circular array of positioning holes 23 of the ring loading platform 22, the rotating shaft is precisely aligned with the fatigue testing section 4 and the impact testing section 5. With the stable support of the support 21, the rotating shaft is prevented from shifting during the test, ensuring the accuracy of the test action and the test data.

[0025] In this embodiment, the fatigue testing unit 4 is used to simulate tens of thousands of opening and closing fatigue conditions of the folding screen hinge during daily use, taking into account environmental simulation requirements. It includes a Z-shaped arm 41, which is mounted on the loading platform 22. One end of the Z-shaped arm 41 is equipped with a motor 42 and is rotatably connected to two rotating shafts 43. The output shaft of the motor 42 is fixedly connected to one of the rotating shafts 43. Gears 44 are fitted on both rotating shafts 43 and mesh with each other. Adjusting arms 45 are fixedly fitted on both rotating shafts 43. Heating elements 46 and support rods 47 are mounted on the adjusting arms 45. Support arms are rotatably connected to the ends of the two adjusting arms 45. 48. The two adjusting arms 45, heating element 46, support rod 47 and support arm 48 are all symmetrically arranged. The two bearing members on both sides of the water droplet rotating shaft 3 are in contact with the support rod 47 at the corresponding position. The structural connecting plates on both sides of the water droplet rotating shaft 3 are in contact with the heating element 46 at the corresponding position. The symmetrical adjusting arms 45 are driven to swing back and forth by the motor 42 and gear 44, which drives the rotating shaft to complete the folding and unfolding cycle. At the same time, the heating element 46 is used to simulate the high temperature environment and restore the fatigue damage evolution under different scenarios. There are two fatigue testing units 4. Both fatigue testing units 4 are installed on the loading platform 22 and are symmetrically arranged between each other.

[0026] It is worth noting that the impact test section 5 is used to simulate the combined working conditions of fatigue accumulation and drop impact. It includes four L-shaped arms 51, which are symmetrically installed in pairs on the loading platform 22. Each L-shaped arm 51 has a sliding hole 52, and a rotating rod 53 is slidably connected in each sliding hole 52. A base 54 is movably installed between the four rotating rods 53. Limiting grooves 55 are opened on both sides of the base 54. A sliding rod is slidably connected to the base 54, and an impact head 56 is fixedly connected to each sliding rod. A spring 57 is elastically connected between the impact head 56 and the base 54. The base 54 is slidably connected to the Z-shaped arms 41 in the two fatigue test sections 4 through the limiting grooves 55. The ends of the support arms 48 in the two fatigue test sections 4 are sleeved on the rotating rods 53 at the corresponding positions. With the help of the adjusting arm 45, the support arms 48 and the rotating rods 53 are linked together, driving the base 54 to move back and forth. By allowing the impact head 56 to apply intermittent impacts to the rotating shaft, the drop scenario in user use is reproduced.

[0027] It is worth noting that the detection unit 7 is used to capture internal damage of the water droplet shaft 3 in real time. It includes a groove 71, which is formed on the moving pressure head 6. A housing 72 is installed on the inner wall of the groove 71. A wire hole 73 communicating with the housing 72 is formed on the moving pressure head 6. A rod hole 74 is formed on the moving pressure head 6. A sliding rod 2 is slidably connected in the rod hole 74. A pressure plate 75 is fixedly connected to the end of the sliding rod 2. A spring 2 76 is elastically connected between the pressure plate 75 and the moving pressure head 6. An ultrasonic host 77 is installed on the pressure plate 75. A phased array probe 78 is set on the ultrasonic host 77. The pressure plate 75 contacts the adjusting arms 45 in the two fatigue testing units 4 respectively. The phased array probe 78 contacts the core force-bearing component of the water droplet shaft 3. Through the dynamic following of the pressure plate 75 and the adjusting arms 45, the phased array probe 78 is precisely matched. The ultrasonic host 77 converts the sound wave reflection signal into a grayscale image, marks the damage location, size and severity in real time, and tracks the entire damage evolution process.

[0028] The working principle is that the water droplet rotating shaft 3 is installed in the positioning hole 23 of the annular loading platform 22 by bolts. The positioning hole 23 is distributed in a circular array to ensure that the rotating shaft is in the center position after installation and is precisely aligned with the fatigue test section 4 and impact test section 5 on both sides. The support 21 provides stable support for the loading platform 22.

[0029] After the motor 42 starts, its output shaft drives one of the rotating shafts 43 to rotate. Through two meshing gears 44, the two rotating shafts 43 rotate in opposite directions synchronously, thereby driving the two symmetrical adjusting arms 45 sleeved on the rotating shafts 43 to open and close. When unfolded, the adjusting arms 45 open outwards and when folded, they retract inwards.

[0030] The support rod 47 and heating plate 46 on the adjusting arm 45 are in contact with the two sides of the bearing and structural connecting plate of the water droplet rotating shaft 3. As the adjusting arm 45 opens and closes, it synchronously completes the cycle of unfolding, folding and unfolding again. The motor 42 continuously rotates in both directions to accurately simulate the fatigue opening and closing conditions of tens of thousands of times in daily use. At the same time, the heating plate 46 can be set with temperature according to the test requirements to simulate a high temperature environment.

[0031] When the fatigue testing unit 4 is working, the support arm 48 at the end of the adjusting arm 45 swings synchronously with the opening and closing of the adjusting arm 45. The rotating rod 53 on the support arm 48 slides in the sliding hole 52 of the L-shaped arm 51, thereby driving the base 54 to reciprocate along the limiting groove 55 of the Z-shaped arm 41. When the base 54 reciprocates close to the water droplet rotating shaft 3, the impact head 56 applies intermittent impact load to the core force area of ​​the water droplet rotating shaft 3, accurately simulating the drop impact scenario in user use, realizing the synchronous composite working condition simulation of fatigue accumulation and impact, and reproducing the core damage causes in actual use.

[0032] After the moving pressure head 6 drives the detection unit 7 to initial positioning, the pressure plate 75 is elastically connected to the moving pressure head 6 through the slide rod 2, and the bottom of the pressure plate 75 is in close contact with the surface of the two side adjusting arms 45. When the adjusting arms 45 swing open and close, the pressure plate 75 will move up and down synchronously through friction. When the adjusting arms 45 open, the pressure plate 75 falls down with the adjusting arms 45; when the adjusting arms 45 close, the pressure plate 75 rises up with the adjusting arms 45, forming a dynamic following that is completely synchronized with the fatigue action.

[0033] When the adjusting arm 45 lifts the pressure plate 75 upwards, the phased array probe 78 rises synchronously with the pressure plate 75, temporarily separating from the core force-bearing component of the water droplet rotating shaft 3. This corresponds precisely to the stage in the impact test section 5 where the impact head 56 applies an impact load to the water droplet rotating shaft 3. The probe's rise can completely avoid the impact action, preventing the impact force from being transmitted to the probe and causing damage, while not affecting the normal simulation of the impact condition.

[0034] When the adjusting arm 45 drives the pressure plate 75 to fall downwards, the phased array probe 78, along with the pressure plate 75, re-fits tightly with the core force-bearing component of the rotating shaft. The elastic force of the second spring 76 can compensate for the fitting gap, ensuring stable acoustic coupling. At this time, the impact action has ended. The ultrasonic host 77 emits high-frequency acoustic waves through the phased array probe 78, which penetrate the water droplet rotating shaft 3. If the core component is damaged by microcracks, internal loosening, or other damage due to early fatigue opening and closing or impact, the acoustic waves will reflect at the damaged interface to form a characteristic signal. The host converts the signal into a grayscale image and marks the location, size, and severity of the damage in real time.

[0035] The phased array probe 78 can detect the stress damage changes of the core component in a timely manner after each impact during tens of thousands of folding simulations. This not only achieves full-cycle tracking of damage evolution, but also protects the probe by dynamically staggering impacts, avoiding damage to the detection equipment.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A fatigue testing device for a folding screen hinge, comprising a pressure testing machine (1), characterized in that: The pressure testing machine (1) is provided with a feeding section (2) for providing a precise and stable installation reference. The feeding section (2) is provided with a water droplet rotating shaft (3). The feeding section (2) is provided with a fatigue testing section (4) for simulating tens of thousands of opening and closing fatigue conditions in daily use of the folding screen rotating shaft, while also taking into account environmental simulation requirements. The fatigue testing section (4) is provided with an impact testing section (5) for simulating a combined condition of fatigue accumulation and drop impact. The pressure testing machine (1) is provided with a moving pressure head (6). The moving pressure head (6) is provided with a detection section (7) for real-time detection of internal damage to the water droplet rotating shaft (3).

2. The folding screen hinge fatigue testing device according to claim 1, characterized in that: The feeding part (2) includes a support (21), which is installed on the table of the pressure testing machine (1). A feeding platform (22) is fixedly connected to the support (21), and a positioning hole (23) is provided on the feeding platform (22).

3. The folding screen hinge fatigue testing device according to claim 2, characterized in that: The loading platform (22) is a ring structure, the positioning holes (23) are arranged in a circular array on the loading platform (22), and the water droplet rotating shaft (3) is arranged on the loading platform (22) and installed on the positioning holes (23) by bolts.

4. The folding screen hinge fatigue testing device according to claim 2, characterized in that: The fatigue testing unit (4) includes a Z-shaped arm (41), which is mounted on a loading platform (22). One end of the Z-shaped arm (41) is equipped with a motor (42) and rotatably connected to two rotating shafts (43). The output shaft of the motor (42) is fixedly connected to one of the rotating shafts (43). Gears (44) are fitted on both rotating shafts (43), and the two gears (44) mesh with each other. Adjusting arms (45) are fixedly fitted on both rotating shafts (43). Heating plates (46) and support rods (47) are installed on the adjusting arms (45), and support arms (48) are rotatably connected to the ends of the two adjusting arms (45).

5. The folding screen hinge fatigue testing device according to claim 4, characterized in that: The two adjusting arms (45), heating element (46), support rod (47) and support arm (48) are symmetrically arranged. The two bearing members on both sides of the water droplet rotating shaft (3) are in contact with the support rod (47) at the corresponding position, and the two structural connecting plates on both sides of the water droplet rotating shaft (3) are in contact with the heating element (46) at the corresponding position.

6. The folding screen hinge fatigue testing device according to claim 5, characterized in that: There are two fatigue testing units (4), both of which are installed on the loading platform (22) and are arranged symmetrically between each other.

7. The folding screen hinge fatigue testing device according to claim 6, characterized in that: The impact testing unit (5) includes four L-shaped arms (51), which are symmetrically mounted on the loading platform (22) in pairs. Each L-shaped arm (51) has a sliding hole (52), and a rotating rod (53) is slidably connected in each sliding hole (52). A base (54) is movably installed between the four rotating rods (53). Limiting grooves (55) are opened on both sides of the base (54). A sliding rod is slidably connected to the base (54), and an impact head (56) is fixedly connected to each sliding rod. A spring (57) is elastically connected between the impact head (56) and the base (54).

8. The folding screen hinge fatigue testing device according to claim 7, characterized in that: The base (54) is slidably connected to the Z-shaped arm (41) in the two fatigue test sections (4) through the limiting groove (55), and the ends of the support arms (48) in the two fatigue test sections (4) are sleeved on the rotating rod (53) at the corresponding positions.

9. The folding screen hinge fatigue testing device according to claim 6, characterized in that: The detection unit (7) includes a groove (71), which is formed on the movable pressure head (6). A housing (72) is installed on the inner wall of the groove (71). A wire hole (73) communicating with the housing (72) is provided on the movable pressure head (6). A rod hole (74) is provided on the movable pressure head (6). A slide rod is slidably connected in the rod hole (74). A pressure plate (75) is fixedly connected to the end of the slide rod. A spring (76) is elastically connected between the pressure plate (75) and the movable pressure head (6). An ultrasonic host (77) is installed on the pressure plate (75). A phased array probe (78) is provided on the ultrasonic host (77).

10. A folding screen hinge fatigue testing device according to claim 9, characterized in that: The pressure plate (75) contacts the adjusting arm (45) in the two fatigue test sections (4) respectively, and the phased array probe (78) contacts the core force-bearing component of the water droplet rotating shaft (3).

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