ALC wall panel coating crack resistance testing device

Abstract

This utility model relates to the field of coating performance testing technology. The crack resistance testing device for ALC wall panel coatings includes: a frame with its front and rear sides forming a through-cavity, and an opening at the top of the frame communicating with the cavity; a sample fixing mechanism movably disposed on both sides of the opening at the top of the frame, used to fix the sample at both sides; and a sample driving mechanism disposed on the frame, the driving end of which is connected to the sample fixing mechanism. The crack resistance performance of the sample is tested by controlling the movement of the sample by controlling the sample fixing mechanism on one side. This device can effectively simulate the deformation that may occur in ALC wall panels during actual applications and quantitatively evaluate the coating's response. It solves the technical problem of lacking a testing device for the crack resistance performance of ALC wall panel coatings in the prior art, providing an effective testing method for the research and development and quality control of ALC wall panel coatings, and has good technical effects.

Description

Technical Field

[0001] This utility model relates to the field of coating performance testing technology, and in particular to a device for testing the crack resistance performance of ALC wall panel coating. Background Technology

[0002] ALC panels, or autoclaved lightweight aerated concrete partition walls, are porous concrete products made primarily from silica sand, cement, and lime, reinforced with steel bars, and cured under high-temperature, high-pressure steam. ALC wall panels offer advantages such as lightweight, fire resistance, sound insulation, environmental friendliness, economy, and ease of construction. However, their porous and lightweight substrate characteristics differ significantly from conventional concrete wall panels. Due to their porosity, ALC wall panels are prone to expansion and deformation after absorbing moisture. Furthermore, the inconsistent deformation rates between ALC wall panels and the main concrete frame during temperature changes can also lead to deformation and even cracking. To ensure the performance and appearance of ALC wall panels, a coating is typically applied to their surface. However, due to the unique deformation characteristics of ALC wall panels, special requirements are placed on the crack resistance performance of the surface coating. Conventional crack resistance testing methods and devices used for ordinary concrete substrate coatings may not accurately assess the actual crack resistance performance of ALC wall panel coatings. Currently, there is a lack of a dedicated crack resistance testing device for ALC wall panel coatings on the market. This makes it difficult to effectively simulate the deformation that ALC wall panels may experience in real-world applications and accurately test the crack resistance of the coatings under these deformations. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0003] This utility model discloses a device for testing the crack resistance performance of ALC wall panel coatings, aiming to solve the technical problem of the difficulty in effectively testing the crack resistance performance of ALC wall panel coatings. The testing device includes: The frame has a through-type front and rear sides that form a receiving cavity, and the top of the frame has an opening that communicates with the receiving cavity. The sample fixing mechanism is movably installed on both sides of the opening at the top of the frame, and is used to fix the sample on both sides respectively; The sample driving mechanism is mounted on the frame. The driving end of the sample driving mechanism is connected to the sample fixing mechanism. The crack resistance performance of the sample is detected by controlling the sample fixing mechanism on one side to drive the sample to move.

[0004] Preferably, the detection device further includes a first detection mechanism, which includes a diagonal brace fixedly installed on the top of the frame, a mounting plate installed at the end of the diagonal brace away from the frame, and a camera installed at the bottom of the mounting plate.

[0005] Preferably, the bottom of the mounting plate is equipped with several supplementary lights arranged around the perimeter of the camera.

[0006] Preferably, the testing device further includes a second testing mechanism, which includes a base plate movably disposed inside the receiving cavity, a vertical rod mounted on the top of the base plate, a support plate mounted on the top of the vertical rod, and a strain gauge movably disposed on the support plate for adhering to the measuring point position of the sample.

[0007] Preferably, a positioning plate is installed on the bottom side inside the receiving cavity. The shape of the positioning plate is adapted to the shape of the bottom plate to limit the position of the bottom plate inside the receiving cavity.

[0008] Preferably, the sample driving mechanism includes a first electric push rod installed in the receiving cavity and a second electric push rod installed on the side of the frame. The first electric push rod drives the corresponding sample fixing mechanism to move vertically, and the second electric push rod drives the corresponding sample fixing mechanism to move horizontally.

[0009] Preferably, the sample fixing mechanism includes a first detection plate and a second detection plate respectively disposed on both sides of the frame opening, the driving end of the first electric push rod is connected to the bottom of the first detection plate, and the driving end of the second electric push rod is connected to the side of the second detection plate.

[0010] Preferably, the top of the second detection plate is provided with a relief groove for accommodating the connecting wires of the strain gauge.

[0011] Preferably, the positioning plate is U-shaped and the base plate is rectangular, with the recessed part of the positioning plate matching the size of the base plate.

[0012] Preferably, the top of both the first and second test plates is bolted with two U-shaped fasteners, and the four U-shaped fasteners are used to fix the four corners of the sample.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a device for testing the crack resistance performance of ALC wall panel coatings. By setting up a frame, a sample fixing mechanism, and a sample driving mechanism, the device can fix a coated ALC wall panel sample onto the sample fixing mechanism. The sample driving mechanism drives the sample fixing mechanism to move, applying deformation (including vertical tension and horizontal compression) to the sample. Simultaneously, in conjunction with a first detection mechanism (camera) and a second detection mechanism (strain gauge), the strain gauge detects the deformation state and degree of the sample, and the camera captures images of the coating on the sample surface during the deformation process. This allows for a comprehensive and accurate detection of the crack resistance performance of the ALC wall panel coating after sample deformation. This device can effectively simulate the deformation that may occur in ALC wall panels in practical applications and quantitatively evaluate the coating's response. It solves the technical problem of the lack of a dedicated device for testing the crack resistance performance of ALC wall panel coatings in the prior art, providing an effective testing method for the research and development and quality control of ALC wall panel coatings, and demonstrating good technical effectiveness. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the ALC wall panel coating crack resistance testing device.

[0015] Figure 2 This is a bottom view schematic diagram of the crack resistance testing device for ALC wall panel coatings.

[0016] Figure 3 This is a side view schematic diagram of the crack resistance testing device for ALC wall panel coatings.

[0017] Figure 4 for Figure 1 A magnified structural diagram of point A in the middle.

[0018] In the diagram: 1. Frame; 2. Strain gauge; 3. Vertical rod; 4. Support plate; 5. U-shaped fastener; 6. First electric push rod; 7. First detection plate; 8. Camera; 9. Second electric push rod; 10. Second detection plate; 11. Clearance groove; 12. Positioning plate; 13. Base plate; 14. Diagonal brace; 15. Mounting plate; 16. Fill light; 17. Receiving cavity. Detailed Implementation The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] With the continuous development of building technology, new building materials such as ALC (autoclaved lightweight aerated concrete) wall panels are being used more and more widely. ALC wall panels are favored for their advantages such as lightweight, heat insulation, and sound insulation. However, the porous nature of ALC wall panels makes them susceptible to deformation due to changes in humidity and temperature. This deformation can lead to cracking of the coating on the surface, affecting the aesthetics and service life of the building. Existing methods and devices for testing the crack resistance of coatings are usually designed for conventional concrete substrates and are difficult to effectively simulate the unique deformation patterns of ALC wall panels, nor can they accurately assess the actual crack resistance performance of coatings on ALC substrates. This poses a challenge to the research and development and quality control of ALC wall panel coatings, and there is an urgent need for a dedicated device that can test the crack resistance performance of coatings based on the characteristics of ALC wall panels. This utility model provides a crack resistance testing device for ALC wall panel coatings. This device, by simulating the deformation that ALC wall panels may undergo in actual applications and in conjunction with appropriate testing methods, can effectively assess the crack resistance performance of the coating, thereby overcoming the limitations of existing technologies. The device includes a frame 1, a sample fixing mechanism, and a sample driving mechanism. The sample fixing mechanism is movably disposed on both sides of the top opening of the frame 1 to fix the sample in both sides. The sample driving mechanism is disposed on the frame 1, and its driving end is connected to the sample fixing mechanism. The crack resistance performance of the sample is detected by controlling the sample fixing mechanism on one side to drive the sample to move.

[0021] In this application, the term "sample" refers to a specimen cut from an ALC wall panel and coated with the paint to be tested. This sample serves as the carrier for testing the paint's crack resistance performance. The term "sample fixing mechanism" refers to a structure used to reliably fix the sample to the testing device; it needs to be able to withstand the stress generated during the sample's deformation and allow the sample to deform under controlled drive. The term "sample driving mechanism" refers to a mechanism that provides power and displacement to the sample fixing mechanism, thereby causing the sample to undergo a predetermined deformation. This testing device is typically used in a laboratory environment for performance evaluation and comparison of ALC wall panel paints with different formulations or processes.

[0022] Specifically, the crack resistance testing device for ALC wall panel coating of this utility model includes a frame 1, see [link to device]. Figure 1 , Figure 2 and Figure 3 As shown, the frame 1 constitutes the support frame of the entire device. The front and rear sides of the frame 1 are through-type, thereby forming a receiving cavity 17. The top of the frame 1 is open, and the opening communicates with the receiving cavity 17. The frame 1 can be constructed by welding or bolting metal profiles, and has sufficient strength and stability to support other components and withstand the loads generated during the testing process.

[0023] The device also includes a sample fixing mechanism, which is movably disposed on both sides of the top opening of the frame 1 to fix the sample in lateral position. This sample fixing mechanism needs to be able to firmly clamp or fix the sample, while allowing relative movement under the action of the sample driving mechanism, thereby causing deformation of the sample. As one possible implementation, the sample fixing mechanism may include clamps or support plates disposed on both sides of the top opening of the frame 1, to which the sample is fixed by bolts, clips, or other fasteners.

[0024] The device also includes a sample driving mechanism mounted on the frame 1, with its driving end connected to the sample fixing mechanism. This driving mechanism provides power to move the sample fixing mechanism on one side relative to the other side or the frame 1, thereby deforming the sample fixed to the fixing mechanism. The driving mechanism can employ various types of driving devices, such as, but not limited to, electric actuators, hydraulic cylinders, or lead screw drives with motors, as long as precise displacement control of the sample fixing mechanism can be achieved. By controlling the direction and amount of displacement of the driving mechanism, different types of deformation, such as tension or compression, can be applied to the sample.

[0025] Compared with existing testing devices for conventional concrete coatings, the ALC wall panel coating crack resistance testing device of this invention has significant advantages. Existing devices often cannot simulate the deformation patterns of ALC wall panels caused by moisture absorption expansion or temperature changes in actual applications, or they cannot directly perform controlled deformation tests on ALC substrates. However, the device of this invention, through a specially designed frame 1, sample fixing mechanism, and sample driving mechanism, can directly fix ALC wall panel samples and apply precisely controlled tensile or compressive deformation. This ability to directly perform relevant deformation tests on ALC substrates makes the evaluation of coating crack resistance performance closer to actual application conditions, thus enabling more accurate prediction of the coating's performance on ALC wall panels. Therefore, this invention provides a more targeted and effective method for testing the crack resistance performance of ALC wall panel coatings, filling a gap in this field.

[0026] When using the ALC wall panel coating crack resistance testing device of this invention, the ALC wall panel sample coated with the coating to be tested is first prepared. Then, the sample is placed on the sample fixing mechanism, which secures both sides of the sample. This sample fixing mechanism is movably mounted on both sides of the opening at the top of the frame 1, facilitating sample placement and fixation. Next, the sample driving mechanism is activated. This driving mechanism is mounted on the frame 1, and its driving end is connected to the sample fixing mechanism. By controlling this driving mechanism, the sample fixing mechanism on one side can be precisely displaced relative to the other side or the frame 1. For example, the sample fixing mechanism can be driven outward to apply tensile deformation to the sample; or driven inward to apply compressive deformation to the sample. During the deformation of the sample, the coating on its surface is also subjected to stress and strain. By employing appropriate detection methods (e.g., visual observation, microscopic examination, or image analysis), changes on the coating surface can be monitored in real time, such as the initiation and propagation of cracks, or phenomena like coating peeling and wrinkling. Frame 1 provides a stable support platform for the entire detection process. The sample fixing mechanism ensures the sample remains stable and deforms uniformly under stress. The sample driving mechanism provides the power and precise displacement control required to achieve controlled deformation. In this way, the device can effectively simulate the deformation of ALC wall panels in practical applications and directly evaluate the crack resistance of coatings on ALC substrates, thus providing reliable data support for performance research, formulation optimization, and quality control of ALC wall panel coatings.

[0027] Furthermore, this application also proposes a first testing mechanism, which includes a diagonal brace 14 fixedly installed on the top of the frame 1, with a mounting plate 15 installed at the end of the diagonal brace 14 away from the frame 1, and a camera 8 installed at the bottom of the mounting plate 15.

[0028] See Figure 1 , Figure 2 and Figure 3 As shown, as a further improvement to the crack resistance testing device for ALC wall panel coatings, this application includes a first testing mechanism. This first testing mechanism is mainly used for visual monitoring and image acquisition of the coating applied to the surface of the sample during deformation. The first testing mechanism includes a diagonal brace 14, a mounting plate 15, and a camera 8. The diagonal brace 14 is fixedly installed on the top of the frame 1, for example, by welding or bolting. The diagonal brace 14 extends upward and inward, with the mounting plate 15 installed at its end away from the frame 1. The mounting plate 15 provides a mounting platform for the camera 8, which is fixedly installed at the bottom of the mounting plate 15 and positioned to clearly observe the coating on the sample surface below.

[0029] The setup of this first testing mechanism allows for real-time or timed image acquisition of the coating on the ALC wall panel sample while tensile or compressive deformation is applied. This camera 8 can be a high-resolution industrial camera to capture subtle changes on the coating surface, such as crack initiation and propagation, coating peeling, or wrinkling. Analysis of the acquired images allows for a direct assessment of the coating's crack resistance and failure modes under different deformation levels. The structure of the diagonal brace 14 and mounting plate 15 provides stable support and precise positioning for the camera 8, ensuring the quality and consistency of image acquisition.

[0030] Therefore, by adding this first detection mechanism to the existing detection device, the technical solution of this application can not only apply controlled deformation to the sample, but also visually monitor the response of the coating surface through camera 8. This visual monitoring capability is an important supplement to simple deformation control, enabling researchers to directly observe the damage process and failure mode of the coating, thereby gaining a more comprehensive and in-depth understanding of the coating's crack-resistant mechanism and performance. The introduction of this first detection mechanism significantly enhances the device's detection function and data acquisition capabilities, providing richer and more intuitive information for the performance evaluation of ALC wall panel coatings, and is a beneficial improvement of this application compared to existing technologies.

[0031] Furthermore, this application also proposes that the bottom of the mounting plate 15 is equipped with several supplementary lights 16 arranged around the periphery of the camera 8.

[0032] See Figure 2 and Figure 3 As shown, as a further optimization of the first testing mechanism, this application provides several supplementary lights 16 at the bottom of the mounting plate 15, near the mounting position of the camera 8. These supplementary lights 16 are arranged around the periphery of the camera 8. The supplementary lights 16 are used to provide auxiliary illumination when the camera 8 acquires images of the sample surface.

[0033] The fill light 16 is positioned to provide the camera 8 with a uniform, ample, and shadow-free lighting environment. When a sample is deformed, the coating on its surface may develop fine cracks, wrinkles, or texture changes; these details are difficult to capture clearly under insufficient or uneven lighting conditions. By surrounding the camera 8 with several fill lights 16, the sample surface can be illuminated from multiple directions, thereby minimizing shadows and ensuring consistent light intensity across the entire field of view. The fill light 16 can utilize efficient and compact light sources such as LEDs.

[0034] Therefore, by adding surrounding supplementary lighting 16 to the first detection mechanism, the technical solution of this application significantly improves the quality of images acquired by the camera 8. Clear, shadow-free images are crucial for subsequent image analysis (e.g., using software algorithms such as Digital Image Correlation (DIC)), enabling researchers to more accurately identify and track minute deformations, crack initiation, and propagation processes on the coating surface. This additional feature effectively enhances the function of the first detection mechanism, ensuring the acquisition of high-precision detection data and further improving the performance and reliability of the entire detection device.

[0035] Furthermore, this application also proposes a second testing mechanism, which includes a base plate 13 movably disposed inside the receiving cavity 17, a vertical rod 3 mounted on the top of the base plate 13, a support plate 4 mounted on the top of the vertical rod 3, and a strain gauge 2 movably disposed on the support plate 4 for adhering to the measuring point position of the sample.

[0036] See Figure 1 , Figure 3 and Figure 4 As shown, to further improve the crack resistance testing device for ALC wall panel coatings, this application includes a second testing mechanism. This second testing mechanism is mainly used for quantitatively measuring the strain state and degree of the sample during deformation. The second testing mechanism includes a base plate 13, a vertical rod 3, a support plate 4, and strain gauges 2. The base plate 13 is movably disposed on the bottom side inside the receiving cavity 17 formed by the frame 1. The vertical rod 3 is fixedly installed on the top of the base plate 13, extending upwards, and the support plate 4 is installed on its top. The strain gauges 2 are movably disposed on the support plate 4 and are used to adhere to the measuring points on the sample during the sample preparation stage.

[0037] The strain gauge 2 is a sensor that converts mechanical deformation into an electrical signal. By measuring its resistance change, the strain value generated by the sample under force can be accurately calculated. The base plate 13, vertical rod 3, and support plate 4 constitute the structure supporting the strain gauge 2 during the sample preparation stage. Specifically, during the process of bonding the strain gauge 2 to the lower surface of the sample and waiting for the adhesive to cure, the base plate 13, vertical rod 3, and support plate 4 can provide support for the strain gauge 2 from below, ensuring that the strain gauge 2 can be flat and firmly bonded to the predetermined position on the sample. During actual deformation testing, the structure of the base plate 13, vertical rod 3, and support plate 4 can be removed to avoid interference with the deformation process of the sample. The strain gauge 2 is connected to an external strain measuring instrument via wires, thereby realizing the real-time acquisition and recording of sample deformation data.

[0038] Therefore, by adding this second detection mechanism to the existing detection device, the technical solution of this application not only enables visual observation of changes on the coating surface via camera 8, but also allows for precise quantitative measurement of the overall or local deformation of the sample via strain gauge 2. The strain data provided by strain gauge 2 complements the image information acquired by camera 8, making the evaluation of the crack resistance performance of ALC wall panel coatings more comprehensive and scientific. Quantitative strain data can accurately reflect the stress state and deformation degree of the sample. Combined with the damage to the coating surface, the failure mechanism of the coating can be analyzed in depth, providing a more reliable basis for optimizing coating performance. This additional feature significantly improves the data acquisition capability of the device and the reliability of the detection results, representing a significant technical contribution of this application.

[0039] Furthermore, this application also proposes a first testing mechanism, which includes a diagonal brace 14 fixedly installed on the top of the frame 1, with a mounting plate 15 installed at the end of the diagonal brace 14 away from the frame 1, and a camera 8 installed at the bottom of the mounting plate 15.

[0040] See Figure 1 , Figure 2 and Figure 3 As shown, a first testing mechanism is set up as an important component of the crack resistance testing device for ALC wall panel coatings in this application. This first testing mechanism is mainly responsible for visual monitoring and image acquisition of the coating applied to the surface of the sample when the sample undergoes deformation. The first testing mechanism includes a diagonal brace 14, a mounting plate 15, and a camera 8. The diagonal brace 14 is fixedly installed on the top of the frame 1, for example, through welding, bolting, or other suitable fixing methods. The diagonal brace 14 extends upward and inward, with its end away from the frame 1 connected to the mounting plate 15. The mounting plate 15 is a platform structure used to mount the camera 8. The camera 8 is fixedly installed at the bottom of the mounting plate 15 and positioned to allow a clear view of the coating on the sample surface below.

[0041] The diagonal brace 14 provides structural support from the frame 1 to the mounting plate 15, ensuring sufficient stability and rigidity for the mounting plate 15 and the camera 8 mounted thereon, preventing image blurring or positional shifts due to vibration or other factors during inspection. The mounting plate 15 serves as the direct mounting base for the camera 8, and its size and shape can be designed according to the selected camera 8 model and installation method; for example, screw holes or mounting slots can be pre-drilled. The camera 8 is the core component of this first inspection mechanism, used to convert optical information from the coating surface into electrical signals, thereby forming a digital image. The camera 8 can be a high-resolution, high-frame-rate industrial camera to capture subtle changes in the coating surface during sample deformation. The connection between the camera 8 and the mounting plate 15 can be achieved using screw fixing, snap-fit ​​connections, or other secure methods.

[0042] Therefore, by setting up a diagonal brace 14 fixedly mounted on the top of the frame 1 and a mounting plate 15 connected to the diagonal brace 14, a stable and precisely positioned mounting platform is provided for the camera 8. This structure ensures that the camera 8 can always be aligned with the target area on the sample surface and stably acquire high-quality image data during sample deformation. Clear and stable images are the basis for subsequent image analysis (such as digital image correlation), and are crucial for accurately assessing the deformation, crack initiation, and propagation of the coating. This additional feature effectively improves the image acquisition capability of the device and the reliability of the detection results, and is one of the key technical solutions for achieving crack resistance performance detection based on image analysis in this application.

[0043] Furthermore, this application also proposes that the lower surface of the mounting plate 15 is fixedly connected with a surrounding supplementary light 16.

[0044] See Figure 2 and Figure 3 As shown, as a further improvement to the first testing mechanism, this application provides several supplementary lights 16 on the lower surface of the mounting plate 15, near the mounting position of the camera 8. These supplementary lights 16 are fixedly connected in a ring around the periphery of the camera 8. The supplementary lights 16 are used to provide auxiliary illumination when the camera 8 acquires images of the sample surface.

[0045] The fill light 16 is designed to provide the camera 8 with a uniform, ample, and shadow-free lighting environment. When the ALC wall panel sample deforms, the coating on its surface may develop fine cracks, wrinkles, or texture changes, details that are difficult to capture clearly under insufficient or uneven lighting conditions. By surrounding the camera 8 with several fill lights 16, the sample surface can be illuminated from multiple directions, thereby minimizing shadows and ensuring consistent light intensity across the entire field of view. The fill light 16 can be an efficient and compact light source such as an LED, and can be fixed to the lower surface of the mounting plate 15 by screws, adhesive, or other means.

[0046] Therefore, by adding surrounding supplementary lighting 16 to the first detection mechanism, the technical solution of this application significantly improves the quality of images acquired by the camera 8. Clear, shadow-free images are crucial for subsequent image analysis (e.g., using software algorithms such as Digital Image Correlation (DIC)), enabling researchers to more accurately identify and track minute deformations, crack initiation, and propagation processes on the coating surface. This additional feature effectively enhances the function of the first detection mechanism, ensuring the acquisition of high-precision detection data and further improving the performance and reliability of the entire detection device.

[0047] Furthermore, this application also proposes that the sample driving mechanism includes a first electric push rod 6 installed in the receiving cavity 17, which drives the corresponding sample fixing mechanism to move vertically to apply tensile deformation to the sample.

[0048] See Figure 1 , Figure 2 and Figure 3 As shown, as a specific implementation of the sample driving mechanism, this application provides a first electric push rod 6. The first electric push rod 6 is installed inside the receiving cavity 17 formed by the frame 1. The driving end of the first electric push rod 6 is connected to a corresponding sample fixing mechanism; specifically, its driving end is connected to a first detection plate 7 used to fix one side of the sample. By controlling the extension or retraction of the first electric push rod 6, the first detection plate 7 can be driven to move vertically upwards or downwards.

[0049] The first electric actuator 6 is an actuator capable of converting electrical energy into linear motion, and its stroke and speed can be precisely controlled. When the first electric actuator 6 drives the first detection plate 7 to move upward, the sample will be subjected to a tensile force in the vertical direction because the other side of the sample is fixed by another sample fixing mechanism, thereby producing tensile deformation. The connection between the first electric actuator 6 and the first detection plate 7 can be a hinge or other connection method that allows relative rotation to accommodate the linear motion of the first detection plate 7. By precisely controlling the displacement of the first electric actuator 6, the degree of tensile deformation of the sample can be precisely controlled.

[0050] Therefore, by specifically employing a first electric push rod 6 in the sample driving mechanism to drive the sample fixing mechanism to move vertically, the technical solution of this application can apply controlled tensile deformation to the ALC wall panel sample. Tensile deformation is an important deformation mode that ALC wall panels may experience in practical applications. This additional feature allows the device to simulate the state of the ALC wall panel under tensile stress and evaluate the crack resistance performance of the coating under this condition. This precisely controlled tensile testing capability is a refinement and enhancement of the basic deformation driving function, providing an important testing method for comprehensively evaluating the performance of ALC wall panel coatings.

[0051] Furthermore, this application also proposes that the sample driving mechanism includes a second electric push rod 9 installed on the side of the frame 1, which drives the corresponding sample fixing mechanism to move horizontally to apply compressive deformation to the sample.

[0052] See Figure 1 , Figure 2 and Figure 3As shown, as another specific implementation of the sample driving mechanism, this application provides a second electric push rod 9. This second electric push rod 9 is mounted on the side of the frame 1. The driving end of the second electric push rod 9 is connected to a corresponding sample fixing mechanism; specifically, its driving end is connected to the side of the second detection plate 10 used to fix the sample on the other side. By controlling the extension or retraction of the second electric push rod 9, the second detection plate 10 can be driven to move horizontally towards or away from the first detection plate 7.

[0053] The second electric actuator 9 is also an actuator capable of converting electrical energy into linear motion, and its stroke and speed can be precisely controlled. When the second electric actuator 9 drives the second detection plate 10 to move towards the first detection plate 7, the sample will be subjected to horizontal compression because the other side of the sample is fixed by the first detection plate 7, thus producing compression deformation. The connection between the second electric actuator 9 and the second detection plate 10 can be a hinge or other connection method that allows relative rotation to accommodate the linear motion of the second detection plate 10. By precisely controlling the displacement of the second electric actuator 9, the degree of compression deformation of the sample can be precisely controlled.

[0054] Therefore, by further employing a second electric push rod 9 in the sample driving mechanism to drive the sample fixing mechanism to move horizontally, the technical solution of this application can apply controlled compressive deformation to the ALC wall panel sample. Compressive deformation is another important deformation mode that ALC wall panels may experience in practical applications, such as when subjected to compressive stress or constrained expansion. This additional feature allows the device to simulate the state of ALC wall panels under compressive stress and evaluate the crack resistance performance of the coating under this condition. This precisely controlled compressive testing capability is a further improvement on the basic deformation driving function. Combined with the tensile testing capability, it enables the device to simulate the deformation of ALC wall panels under different stress states, thereby more comprehensively evaluating the crack resistance performance of the coating and providing a more complete testing method for the performance research and optimization of ALC wall panel coatings.

[0055] Furthermore, this application also proposes that the positioning plate 12 is arranged in a "U" shape, the base plate 13 is arranged in a rectangle, and the recessed part of the positioning plate 12 is adapted to the size of the base plate 13.

[0056] See Figure 4 As shown, this application defines the shapes of the positioning plate 12 and the base plate 13 in a preferred structure for the second detection mechanism. Specifically, the positioning plate 12 is U-shaped, while the base plate 13 is rectangular. The U-shaped structure of the positioning plate 12 forms a notch, the size of which matches the size of the rectangular base plate 13. The positioning plate 12 is fixedly mounted on the bottom side inside the receiving cavity 17 formed by the frame 1.

[0057] The U-shaped positioning plate 12, in conjunction with the rectangular base plate 13, provides a simple and effective method for positioning and limiting the base plate 13, which is movably disposed within the receiving cavity 17. When the base plate 13 is placed at the bottom of the receiving cavity 17, its sides can contact or tightly engage with the inner wall of the recessed portion of the U-shaped positioning plate 12. This structure limits the horizontal movement range of the base plate 13, preventing it from sliding or shifting freely within the receiving cavity 17. The positioning plate 12 can be made of sheet metal or other rigid materials and is fixed to the bottom of the frame 1 by welding or bolting.

[0058] Therefore, by designing the positioning plate 12 in a U-shape and adapting its recessed portion to the dimensions of the rectangular base plate 13, the technical solution of this application provides a reliable positioning structure for the base plate 13 in the second testing mechanism. This structure ensures that during the sample preparation stage, the base plate 13 used to support the strain gauge 2 can be accurately placed in the predetermined position, thereby guaranteeing that the strain gauge 2 can be precisely adhered to the measuring point position of the sample. This precise positioning is crucial for the accurate acquisition of subsequent strain data. This additional feature optimizes the auxiliary structure of the second testing mechanism, improving the convenience of device operation and the accuracy of the testing preparation stage.

[0059] Furthermore, this application also proposes that the camera 8 is a precision image sensor.

[0060] See Figure 1 , Figure 2 and Figure 3 As shown, in this application, the camera 8 is defined as a precision image sensor, which is a preferred type of camera in the crack resistance testing device for ALC wall panel coatings. The camera 8 is a key component of the first testing mechanism, installed at the bottom of the mounting plate 15, and is used to acquire images of the coating on the sample surface during the deformation process.

[0061] This precision image sensor refers to an image sensor with high resolution, high sensitivity, and good image quality, such as an industrial-grade CCD (Charge-Coupled Device) sensor or a CMOS (Complementary Metal-Oxide-Semiconductor) sensor. Compared to ordinary cameras, precision image sensors can capture finer image details, have a wider dynamic range, and lower noise. In the ALC wall panel coating crack resistance performance testing, the coating on the sample surface may only show very minor changes in the early stages of deformation, such as the initiation of minute cracks, slight changes in surface texture, or local differences in reflective properties. These subtle visual features are crucial for judging the early failure of the coating and evaluating its crack resistance performance. Selecting a precision image sensor as camera 8 ensures that these subtle changes can be recorded clearly and accurately.

[0062] Therefore, by defining camera 8 as a precision image sensor, the technical solution of this application significantly improves the quality and accuracy of image acquisition. A high-resolution and high-sensitivity image sensor can capture subtle changes occurring on the coating surface during deformation, such as the initiation location of cracks, their propagation paths, and changes in the microstructure of the coating surface. This high-quality image data forms the basis for precise image analysis (such as digital image correlation), enabling researchers to more accurately quantify the strain distribution, stress concentration areas, and crack size and propagation rate of the coating. This additional feature effectively enhances the detection capability of the device, providing strong data support for in-depth research on the crack-resistant mechanism of ALC wall panel coatings and for evaluating their performance.

[0063] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A device for detecting the anti-cracking performance of ALC wallboard paint, characterized in that: include: The frame (1) has a through-type arrangement on the front and rear sides to form a receiving cavity (17), and the top of the frame (1) has an opening that communicates with the receiving cavity (17). The sample fixing mechanism is movably set on both sides of the top opening of the frame (1) and is used to fix the two sides of the sample respectively. The sample driving mechanism is set on the frame (1). The driving end of the sample driving mechanism is connected to the sample fixing mechanism. The crack resistance performance of the sample is detected by controlling the sample fixing mechanism on one side to drive the sample to move.

2. The apparatus for detecting the crack resistance of ALC wall panel paint according to claim 1, wherein: It also includes a first detection mechanism, which includes a diagonal brace (14) fixedly installed on the top of the frame (1), and a mounting plate (15) is installed on the end of the diagonal brace (14) away from the frame (1), and a camera (8) is installed on the bottom of the mounting plate (15).

3. The crack resistance testing device for ALC wall panel coatings according to claim 2, characterized in that: The bottom of the mounting plate (15) is equipped with several fill lights (16) arranged around the camera (8).

4. The apparatus for detecting the crack resistance of ALC wall panel paint according to claim 3, wherein: It also includes a second testing mechanism, which includes a base plate (13) movably disposed inside the receiving cavity (17), a vertical rod (3) is installed on the top of the base plate (13), a support plate (4) is installed on the top of the vertical rod (3), and a strain gauge (2) is movably disposed on the support plate (4), the strain gauge (2) being used to adhere to the measuring point position of the sample.

5. The apparatus for detecting the crack resistance of ALC wall panel paint according to claim 4, wherein: A positioning plate (12) is installed on the bottom side inside the cavity (17). The shape of the positioning plate (12) is adapted to the shape of the bottom plate (13) to limit the position of the bottom plate (13) inside the cavity (17).

6. The apparatus for detecting the crack resistance of ALC wall panel paint according to claim 5, wherein: The sample driving mechanism includes a first electric push rod (6) installed in the receiving cavity (17) and a second electric push rod (9) installed on the side of the frame (1). The first electric push rod (6) drives the corresponding sample fixing mechanism to move vertically, and the second electric push rod (9) drives the corresponding sample fixing mechanism to move horizontally.

7. The crack resistance testing device for ALC wall panel coatings according to claim 6, characterized in that: The sample fixing mechanism includes a first detection plate (7) and a second detection plate (10) respectively disposed on both sides of the opening of the frame (1). The driving end of the first electric push rod (6) is connected to the bottom of the first detection plate (7), and the driving end of the second electric push rod (9) is connected to the side of the second detection plate (10).

8. The crack resistance testing device for ALC wall panel coatings according to claim 7, characterized in that: The top of the second detection plate (10) is provided with a relief groove (11) for accommodating the connecting wire of the strain gauge (2).

9. The device for detecting the anti-cracking performance of ALC wallboard paint according to claim 5, characterized in that: The positioning plate (12) is arranged in a "U" shape, and the base plate (13) is arranged in a rectangle. The recessed part of the positioning plate (12) is adapted to the size of the base plate (13).

10. The apparatus for detecting the crack resistance of ALC wall panel paint according to claim 7, wherein: The top of the first test plate (7) and the second test plate (10) are each bolted with two U-shaped fasteners (5), and the four U-shaped fasteners (5) are used to fix the four corners of the sample.

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