Device for detecting hardness of hot-bent 3D curved glass cover plate

Abstract

The invention relates to the technical field of material performance detection, and discloses a 3D curved glass cover plate hot-bent hardness detection device which comprises a pressure head assembly, the pressure head assembly is used for making contact with a 3D curved glass cover plate and applying pressure to form an indentation, and the outer wall of the pressure head assembly is embedded and fixedly connected into a self-adaptive alignment module. The self-adaptive alignment module is connected with a mobile terminal of the three-axis movement positioning unit, and when the self-adaptive alignment module makes contact with the curved surface of the 3D curved glass cover plate, the posture of the self-adaptive alignment module is passively adjusted based on the contour of the curved surface, so that the central axis of the pressure head assembly is aligned with the normal direction of the 3D curved glass cover plate in the contact area, and the 3D curved glass cover plate is positioned. And the pressure head assembly applies a test force along the aligned normal direction. Through the self-adaptive alignment module, a complex normal alignment problem is converted into a pure mechanical self-adaptive process. When the contact part of the module is attached to the curved surface of the glass, the physical form of the contact part naturally provides an accurate normal direction reference for the pressure head assembly.

Description

Technical Field

[0001] This invention relates to the field of material performance testing technology, specifically a device for testing the hardness of 3D curved glass cover plates after hot bending. Background Technology

[0002] With the rapid development of industries such as consumer electronics, smart wearables, and automotive displays, 3D curved glass covers have become iconic components of high-end products due to their superior visual effects and ergonomic design. Following the critical manufacturing step of hot bending, precise and reliable testing of the surface hardness of the glass cover is a core quality control step to ensure its durability and scratch resistance.

[0003] However, the inherent geometry of 3D curved glass covers presents a fundamental challenge to their hardness testing process. Classical hardness testing methods, such as Vickers or Knoop hardness tests, are theoretically based on the assumption that an indenter acts vertically on a flat, rigid sample surface. When the object being tested becomes a continuously varying curved surface, ensuring that the indenter applies a precise test force along its local normal at every test point becomes an extremely challenging problem. Any loading deviating from the normal direction will cause distortion of the indentation morphology, thereby rendering hardness calculations based on indentation dimensions inaccurate and incomparable.

[0004] To address this challenge, some existing automated inspection solutions have resorted to highly complex five- or six-axis industrial robots, supplemented by 3D vision scanning systems. These systems pre-model the sample in 3D, calculate the normal vector of the target point, and then drive the robot to perform complex posture adjustments to achieve alignment. While this approach is theoretically feasible, in practical applications it suffers from high equipment investment, cumbersome programming and calibration processes, and low inspection efficiency due to changes in the robot's posture, making it difficult to meet the fast-paced, low-cost inspection requirements of large-scale production lines.

[0005] Furthermore, even if precise normal alignment is achieved, the thin-walled structure of the 3D curved glass cover itself presents another, more subtle technical challenge. When test force is applied to the thin glass sample, the sample inevitably undergoes slight elastic sinking or deformation. This macroscopic deformation absorbs some of the indentation energy, resulting in a shallower and smaller indentation depth, leading to a systematically higher measured hardness value than the material's true hardness. This phenomenon is particularly pronounced in micro-load hardness testing, physically interfering with measurement accuracy and representing a prevalent but difficult-to-solve inherent source of error in current technology.

[0006] Therefore, under the current technological background, the industry urgently needs a new hardness testing technology that can not only cleverly resolve the complexity of aligning the normal direction of the curved surface, but also actively eliminate the measurement error caused by the elastic deformation of the sample, thus providing a truly accurate, efficient and economical technical means for the quality control of 3D curved glass. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a hardness testing device for 3D curved glass covers after hot bending. This device solves the problems of existing technologies when testing the hardness of 3D curved glass covers, such as difficulty in accurately aligning the indenter with the normal of the curved surface, the test force easily causing deformation of thin-walled samples and affecting measurement accuracy, and the complex structure and high cost of automated equipment.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a hardness testing device for 3D curved glass cover plates after hot bending, comprising an indenter assembly for contacting the 3D curved glass cover plate and applying pressure to form an indentation. The outer wall of the indenter assembly is embedded and fixedly connected inside an adaptive alignment module. The adaptive alignment module is connected to the mobile terminal of a three-axis motion positioning unit. When the adaptive alignment module contacts the curved surface of the 3D curved glass cover plate, it passively adjusts its posture based on the contour of the curved surface, aligning the central axis of the indenter assembly with the normal direction of the 3D curved glass cover plate in the contact area. The indenter assembly applies a test force along the aligned normal direction. An adaptive support base is provided below the three-axis motion positioning unit, which supports the 3D curved glass cover plate and adaptively deforms according to the shape of the 3D curved glass cover plate.

[0009] By setting up a floating adaptive alignment module, passive and automated alignment of the measurement direction with the surface normal is achieved by utilizing the physical constraints generated when the module contacts the curved glass surface. This process eliminates the need for complex multi-axis servo systems and vision positioning, greatly simplifying the device structure, reducing costs, and improving alignment efficiency. Once the orientation is aligned, the indenter assembly can apply test force along the calibrated normal direction, fundamentally ensuring the effectiveness of the indentation test.

[0010] Preferably, the adaptive alignment module includes an annular contact portion, which is a contact portion that contacts the surface of the 3D curved glass cover plate. A universal ball joint is fixedly connected to its upper end. The ball joint end is floatingly connected to the mobile terminal. A locking device is provided between the ball joint end and the mobile terminal. The locking device is used to lock the degree of freedom of movement of the universal ball joint after the adaptive alignment module completes the attitude adjustment.

[0011] Preferably, the indenter assembly includes a guide sleeve, the outer wall of which is fixedly connected to the central inner wall of the annular contact portion, and the central axes of the two coincide. A voice coil motor is fixedly connected inside the guide sleeve, and a standard hardness indenter is fixedly connected to the output end of the voice coil motor. The standard hardness indenter slides axially along the inner wall of the guide sleeve, and a force sensor is also provided between the output end of the voice coil motor and the standard hardness indenter to monitor and provide feedback in real time on the actual test force applied by the standard hardness indenter to the surface of the 3D curved glass cover.

[0012] Preferably, the annular contact portion has an internal cavity, which is connected to the vacuum pump end of the vacuum generator via an air pipe. The bottom of the annular contact portion has an annular air intake that communicates with the cavity, and corresponding flexible sealing lips are fixedly connected to the inner and outer edges of the annular air intake, respectively, to form a sealed chamber when it is attached to the surface of the 3D curved glass cover.

[0013] Preferably, when the vacuum generator is evacuating, the annular contact portion applies a preload force to the 3D curved glass cover plate in the opposite direction to the test force, so as to counteract the deformation of the 3D curved glass cover plate caused by the test force.

[0014] Preferably, the three-axis motion positioning unit is a three-axis mobile positioning device that performs positioning in three-dimensional space. Its three movement directions are the X-axis direction, the Y-axis direction, and the Z-axis direction, and its mobile terminal is the mobile terminal in the Z-axis direction.

[0015] Preferably, the adaptive support base includes a support seat, in which a plurality of sliding grooves are provided in a rectangular array. A pin is slidably connected in the sliding groove, and the bottom of the pin is connected to the bottom wall of the sliding groove by a spring. A pressure locking cone sleeve is also provided between the sliding groove and the pin, and the pressure locking cone sleeve is driven by hydraulic pressure to fix the position of the pin.

[0016] Preferably, the upper surface of the support base is further provided with a flexible gel pad, which completely covers the array formed by the ejector pins.

[0017] This invention provides a device for testing the hardness of 3D curved glass covers after hot bending. It has the following beneficial effects: 1. This invention transforms the complex normal alignment problem into a purely mechanical adaptive process through a floating adaptive alignment module. When the module's contact part conforms to the curved glass surface, its physical shape naturally provides a precise normal direction reference for the pressure head assembly. This ingenious passive seeking design completely eliminates the reliance on expensive, bulky multi-axis robots and complex vision recognition and servo control systems, greatly simplifying the overall structure of the device. This significantly reduces equipment costs and maintenance difficulty while ensuring high-precision alignment.

[0018] 2. This invention resolves the core technical contradiction between "flexible adaptation" and "rigid measurement" by adding a locking device to the universal ball joint. During the alignment phase, it exhibits flexibility to conform to and fit the unknown curved surface; while during the loading phase, the locking device instantly transforms this flexible connection into a rigid structure, forming a stable and reliable measurement platform. This "flexible-then-rigid" working mode effectively prevents any slight disturbance from the precisely aligned posture caused by the test force, ensuring absolute stability and directional uniqueness during the force loading process.

[0019] 3. To address the challenge of elastic deformation in thin-walled, brittle samples such as 3D curved glass under stress, this invention introduces vacuum adsorption to apply a preload force in the opposite direction. This design does not simply support the sample but establishes an active, upward force field around the test point to counteract the macroscopic settling caused by the downward test force of the indenter. This achieves a dynamic balance between the test force and the preload force. This is not merely a simple superposition of two forces but, through real-time feedback from the force sensor, constructs a local measurement microenvironment where the net external force acting on the sample approaches zero. Indentation testing is performed under this almost undisturbed ideal state, minimizing interference from external factors.

[0020] 4. The design concept of this invention internalizes the complex function of achieving high-precision measurement into a compact, independent core measurement module, while entrusting the large-scale spatial positioning task to a standardized three-axis platform. This task decoupling design gives the device extremely high versatility and scalability. It can not only be easily integrated into existing automated production lines, but also requires almost no complex hardware modifications or software reprogramming when dealing with glass products of different curvatures and shapes, greatly shortening the debugging time for product changeovers and demonstrating strong industrial application flexibility. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the adaptive support base in this invention; Figure 3 This is a schematic diagram of the adaptive alignment module in this invention; Figure 4 This is a schematic diagram of the pressure head assembly in this invention.

[0022] Among them, 10 is the pressure head assembly; 101 is the guide sleeve; 102 is the voice coil motor; 103 is the standard hardness pressure head; 20 is the adaptive alignment module; 201 is the annular contact part; 2011 is the cavity; 2012 is the annular air intake; 2013 is the flexible sealing lip; 202 is the universal ball joint; 30 is the three-axis motion positioning unit; 40 is the adaptive support base; 401 is the support seat; 4011 is the slide groove; 402 is the ejector pin; 403 is the spring; 404 is the pressure locking cone sleeve; and 405 is the flexible gel pad. Detailed Implementation

[0023] 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.

[0024] Please see the appendix Figure 1 -Appendix Figure 4 This invention provides a device for testing the hardness of a 3D curved glass cover after hot bending, including an indenter assembly 10. The indenter assembly 10 is used to contact the 3D curved glass cover and apply pressure to form an indentation. The outer wall of the indenter assembly 10 is embedded and fixedly connected inside an adaptive alignment module 20. The adaptive alignment module 20 is connected to the mobile terminal of a three-axis motion positioning unit 30. When the adaptive alignment module 20 contacts the curved surface of the 3D curved glass cover, it passively adjusts its posture based on the contour of the curved surface, so that the central axis of the indenter assembly 10 is aligned with the normal direction of the 3D curved glass cover in the contact area. The indenter assembly 10 applies a test force along the aligned normal direction. An adaptive support base 40 is provided below the three-axis motion positioning unit 30. The adaptive support base 40 is used to support the 3D curved glass cover and adaptively deforms according to the shape of the 3D curved glass cover.

[0025] It should be noted that the embodiment of the present invention provides a hardness testing device for 3D curved glass cover plates after hot bending, which also includes a central control and data acquisition system. This system is electrically connected to the three-axis motion positioning unit 30, the indenter assembly 10, the adaptive alignment module 20, and the adaptive support base 40, and is used to coordinate the overall automated operation of the control device and collect and process test data. The central control and data acquisition system is typically composed of an industrial computer equipped with a dedicated motion control card, I / O interface card, and data acquisition card. It executes pre-programmed control software, which stores the coordinate data of all test points on the glass sample to be tested, and has built-in logic for precise timing control of complex workflows. This system is responsible for sending motion commands to the three-axis motion positioning unit 30, and simultaneously managing the start and stop of various subsystems (such as locking, adsorption, loading, etc.) within the indenter assembly 10, the adaptive alignment module 20, and the adaptive support base 40, and collecting data from the force sensor in real time to complete the entire closed-loop control and data recording task.

[0026] The three-axis motion positioning unit 30 is a three-axis mobile positioning device for positioning in three-dimensional space. Its three movement directions are the X-axis, Y-axis, and Z-axis, with the Z-axis being the moving end. The three-axis motion positioning unit 30 adopts a gantry structure, which provides excellent structural rigidity and stability, ensuring that vibration is minimized during high-speed movement and precise positioning. The X, Y, and Z axes are all driven by high-precision servo motors via ball screws, and together with position feedback elements such as optical scales, form a closed-loop position control system, providing reliable spatial positioning capabilities.

[0027] The adaptive support base 40 includes a support seat 401, within which multiple grooves 4011 arranged in a rectangular array are formed. Ejector pins 402 are slidably connected within the grooves 4011. The bottom of the ejector pins 402 is connected to the bottom wall of the groove 4011 via a spring 403. A pressure locking cone sleeve 404 is also provided between the grooves 4011 and the ejector pins 402. The pressure locking cone sleeve 404 is hydraulically driven to fix the position of the ejector pins 402. A flexible gel pad 405 is also provided on the upper surface of the support seat 401, completely covering the array formed by the ejector pins 402.

[0028] The adaptive support platform 40 is designed to provide a stable and stress-free load-bearing environment for 3D curved glass covers with irregular geometries. Through the cooperation of rectangularly arrayed pins 402 and flexible gel pads 405, it can adaptively match the actual shape of the 3D curved glass cover, with its tips precisely conforming to the local contours of the glass's bottom surface. This discrete, flexible array support method evenly distributes the load-bearing force, effectively avoiding stress concentration and sample warping problems that may occur when using traditional rigid clamps.

[0029] The adaptive alignment module 20 is responsible for physically interacting with the glass sample and establishing a measurement reference, while the indenter assembly 10 performs precise force loading tasks on this reference.

[0030] The adaptive alignment module 20 includes an annular contact portion 201, which contacts the surface of the 3D curved glass cover. A universal ball joint 202 is fixedly connected to its upper end. The ball joint 202 is buoyantly connected to the mobile terminal. The universal ball joint 202 enables the entire module to rotate freely in all directions around its center, which is the structural basis for achieving passive normal alignment. A locking device is provided between the ball joint 202 and the mobile terminal. This locking device locks the degree of freedom of the universal ball joint 202 after the adaptive alignment module 20 completes its attitude adjustment. The locking device adopts a friction plate pressurization structure, including a friction chuck fixed to the ball joint and a brake block driven by a miniature cylinder. When compressed air is supplied to the miniature cylinder from an external air source, the brake block is forcefully pushed against the friction chuck, causing the friction chuck to wrap around the universal ball joint 202 and generate enormous frictional force. This instantly locks the movable joint of the universal ball joint 202, transforming it from a freely rotating connector into a highly rigid fixed connector. The bottom of the annular contact portion 201 is precision polished to prevent scratching the glass.

[0031] The annular contact portion 201 has a cavity 2011 inside. The cavity 2011 is connected to the suction end of the vacuum generator through an air pipe. The bottom of the annular contact portion 201 has an annular air intake 2012 that communicates with the cavity 2011. Corresponding flexible sealing lips 2013 are fixedly connected to the inner and outer edges of the annular air intake 2012, which are used to form a sealed chamber when it is attached to the surface of the 3D curved glass cover.

[0032] When the vacuum generator is pumping air, the annular contact portion 201 applies a preload force to the 3D curved glass cover plate in the opposite direction to the test force, so as to counteract the deformation of the 3D curved glass cover plate caused by the test force.

[0033] The indenter assembly 10 includes a guide sleeve 101. The outer wall of the guide sleeve 101 is fixedly connected to the inner wall of the annular contact portion 201, and their central axes coincide. A voice coil motor 102 is fixedly connected inside the guide sleeve 101. A standard hardness indenter 103 is fixedly connected to the output end of the voice coil motor 102. The standard hardness indenter 103 slides axially along the inner wall of the guide sleeve 101. A force sensor is also provided between the output end of the voice coil motor 102 and the standard hardness indenter 103 to monitor and provide feedback in real time on the actual test force applied by the standard hardness indenter 103 to the surface of the 3D curved glass cover. The voice coil motor 102 has the characteristics of no mechanical friction, fast response, and high thrust control accuracy. A high-resolution piezoelectric force sensor is connected in series between the voice coil motor 102 and the standard hardness indenter 103 to measure the actual force applied by the indenter to the sample in real time and accurately. The tip of the standard hardness indenter 103, made of Vickers diamond, is initially retracted within the plane of the annular contact portion 201.

[0034] This invention provides a device for testing the hardness of 3D curved glass covers after hot bending. The originality of the hardness testing method lies in its unique workflow, which may include the following steps: First, the 3D curved glass cover to be tested is placed on the adaptive support base 40, and a slight downward pressure is applied to it so that the flexible gel pad 405 supported by the ejector pin 402 fits into the contour of the bottom surface of the 3D curved glass cover. Then, the hydraulic actuator is activated so that the locking cone sleeve 404 clamps and fixes the ejector pin 402, thereby completing the placement of the 3D curved glass cover.

[0035] Next, the three-axis motion positioning unit 30 drives the adaptive alignment module 20 to move quickly to the point to be measured on the 3D curved glass cover plate and slowly descend to approach the sample surface. This is the positioning and approach stage.

[0036] When the lower end of the annular contact portion 201 contacts the glass surface, it passively adjusts its tilt attitude through the floating connection structure of the universal ball joint 202 and the physical interaction with the curved surface contour until its central axis aligns with the local normal direction of the contact area. This process is completed instantaneously without any external attitude servo control; this is the passive seeking and normal alignment stage.

[0037] After the normal alignment is completed, the locking device is activated to rigidly lock the currently aligned posture of the adaptive alignment module 20, thereby establishing a stable and unchanging reference coordinate for the subsequent force loading process.

[0038] Subsequently, in conjunction with the flexible sealing lip 2013, the vacuum generator draws air to create a strong adsorption force between the annular contact 201 and the glass surface. This force not only enhances the stability of the connection, but more importantly, it applies a vertically upward, controllable preload force to the glass sample to preemptively counteract sample settling that may be caused by subsequent testing forces.

[0039] Finally, the internal indenter assembly 10 applies a precise test force to the glass surface along the locked and aligned normal direction to form an indentation. During this process, the piezoelectric force sensor monitors and adjusts the test force in real time, ensuring its magnitude remains dynamically balanced with the aforementioned preload force. This creates a measurement environment with a net external force approaching zero within a very small local area, ensuring the highest measurement accuracy. After indentation is complete, the system unloads and resets in reverse order, ready for the next point of detection.

[0040] It should be understood that the specific structures described in the foregoing embodiments are merely illustrative of the present invention and do not constitute the only limitation thereof. Those skilled in the art can make various modifications or equivalent substitutions to these specific implementations based on the core technical ideas of the present invention.

[0041] In other embodiments of the present invention, the locking device for achieving rigid posture fixation is not limited to the aforementioned pneumatic form. For example, the locking device can also employ an electromagnetic locking scheme, where a strong magnetic force is generated by energizing the electromagnet coil integrated in the universal ball joint 202 structure to attract or brake its moving parts, thus achieving a fast and reliable locking function. Alternatively, in applications requiring extremely high locking force, a hydraulic locking method can be used, where a miniature hydraulic cylinder is driven by a high-pressure oil circuit to complete the locking action. These different driving methods are chosen to adapt to different industrial environments and performance requirements, but their core purpose of ultimately achieving a "flexible-to-rigid" function is consistent with the present invention.

[0042] Similarly, the voice coil motor 322 is a preferred, but not the only, option. For applications requiring higher displacement resolution and response speed, piezoelectric ceramic actuators can be used to drive the pressure head. Piezoelectric ceramic actuators can produce precise displacements at the micron or even nanometer level under the influence of an electric field, making them ideal for finely adjusting the applied force. Furthermore, a drive unit consisting of a high-precision servo motor and a precision ball screw can also serve as another reliable implementation of a force actuator, offering a large stroke range, stable thrust, and similarly meeting the requirements of closed-loop force control.

[0043] Regarding the adaptive alignment module 20 that applies a preload force to the 3D curved glass cover 200, in addition to the aforementioned vacuum adsorption scheme, other non-contact or semi-contact adsorption techniques can also be used. For example, the principle of electrostatic adsorption can be employed, with electrodes placed in the annular region of the contact area. By applying a high voltage, the device is adsorbed onto the glass surface using electrostatic attraction. This method is particularly effective for glass materials with good insulation properties, and the adsorption force can be precisely controlled by voltage. Although these alternative schemes utilize different physical principles, their fundamental purpose is to construct a controllable preload force field opposite to the direction of the test force, so as to effectively counteract sample deformation.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. 3D curved glass cover plate hardness testing device after hot bending, including indenter assembly (10), characterized in that, The pressure head assembly (10) is used to contact the 3D curved glass cover and apply pressure to form an indentation. The outer wall of the pressure head assembly (10) is embedded and fixedly connected inside the adaptive alignment module (20). The adaptive alignment module (20) is connected to the mobile terminal of the three-axis motion positioning unit (30). When the adaptive alignment module (20) contacts the curved surface of the 3D curved glass cover, it passively adjusts its posture based on the contour of the curved surface, so that the central axis of the pressure head assembly (10) is aligned with the normal direction of the 3D curved glass cover in the contact area. The pressure head assembly (10) applies a test force along the aligned normal direction. An adaptive support base (40) is provided below the three-axis motion positioning unit (30). The adaptive support base (40) is used to support the 3D curved glass cover and it adaptively deforms according to the shape of the 3D curved glass cover.

2. The 3D curved glass cover plate hardness testing device after hot bending according to claim 1, characterized in that, The adaptive alignment module (20) includes an annular contact part (201), which is a contact part that contacts the surface of the 3D curved glass cover plate. A universal ball head (202) is fixedly connected to its upper end. The ball head end of the universal ball head (202) is floatingly connected to the mobile terminal. A locking device is provided between the ball head end of the universal ball head (202) and the mobile terminal. The locking device is used to lock the degree of freedom of the universal ball head (202) after the adaptive alignment module (20) completes the attitude adjustment.

3. The 3D curved glass cover plate hardness testing device after hot bending according to claim 2, characterized in that, The indenter assembly (10) includes a guide sleeve (101), the outer wall of which is fixedly connected to the inner wall of the center of the annular contact part (201), and the central axes of the two coincide. A voice coil motor (102) is fixedly connected inside the guide sleeve (101), and a standard hardness indenter (103) is fixedly connected to the output end of the voice coil motor (102). The standard hardness indenter (103) slides axially along the inner wall of the guide sleeve (101), and a force sensor is also provided between the output end of the voice coil motor (102) and the standard hardness indenter (103) for real-time monitoring and feedback of the actual test force applied by the standard hardness indenter (103) to the surface of the 3D curved glass cover.

4. The 3D curved glass cover plate hardness testing device after hot bending according to claim 3, characterized in that, The annular contact part (201) has a cavity (2011) inside. The cavity (2011) is connected to the suction end of the vacuum generator through an air pipe. The bottom of the annular contact part (201) has an annular air intake (2012) that communicates with the cavity (2011). Corresponding flexible sealing lips (2013) are fixedly connected to the inner and outer edges of the annular air intake (2012) to form a sealed chamber when it is attached to the surface of the 3D curved glass cover.

5. The 3D curved glass cover plate hardness testing device after hot bending according to claim 4, characterized in that, When the vacuum generator is pumping air, the annular contact part (201) applies a preload force to the 3D curved glass cover plate in the opposite direction to the test force, so as to counteract the deformation of the 3D curved glass cover plate caused by the test force.

6. The 3D curved glass cover plate hardness testing device after hot bending according to claim 1, characterized in that, The three-axis motion positioning unit (30) is a three-axis mobile positioning device that performs positioning in three-dimensional space. Its three moving directions are the X-axis direction, the Y-axis direction and the Z-axis direction, and its mobile terminal is the mobile terminal in the Z-axis direction.

7. The 3D curved glass cover plate hardness testing device after hot bending according to claim 1, characterized in that, The adaptive support base (40) includes a support seat (401), and the support seat (401) has multiple sliding grooves (4011) arranged in a rectangular array. A pin (402) is slidably connected in the sliding groove (4011). The bottom of the pin (402) is connected to the bottom wall of the sliding groove (4011) by a spring (403). A pressure locking cone sleeve (404) is also provided between the sliding groove (4011) and the pin (402). The pressure locking cone sleeve (404) is driven by hydraulic pressure to fix the position of the pin (402).

8. The 3D curved glass cover plate hardness testing device after hot bending according to claim 7, characterized in that, The upper surface of the support base (401) is also provided with a flexible gel pad (405), which completely covers the array formed by the ejector pins (402).

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