Strength detection device for building board

Abstract

The present application relates to the technical field of building material strength detection, and discloses a kind of strength detection device of building board, comprising: loading mechanism, for applying mechanical load to board sample and measuring load and deformation amount;Box, box is covered with thermal insulation layer;Sample sealing structure, sample sealing structure is used to seal between the edge of board sample and box;Refrigeration system, heating system, control and data acquisition system. Board sample is subjected to mechanical load under the temperature difference at the interface between low temperature zone and high temperature zone, so as to obtain more mechanical property data conforming to actual application scene, improve the representativeness and reliability of test results, solve the problem that mechanical property of board cannot be accurately evaluated under the condition of controllable temperature difference in prior art, provide comprehensive experimental basis for in-depth study on the performance of building board in extreme environment, and have important significance for research, optimization and quality control of new building materials.

Description

Technical Field

[0001] This invention relates to the field of building material strength testing technology, and in particular to a strength testing device for building panels. Background Technology

[0002] With increasing demands for energy conservation and sustainable development in buildings, new types of thermal insulation panels have been widely used in modern architecture. These panels, such as structural insulation panels, vacuum insulation panels, phase change material composite panels, and various bio-based insulation panels, not only perform vital thermal insulation functions, but their mechanical strength and durability are also key factors in ensuring the safety and life-cycle performance of building structures. To ensure the reliability of these new materials in practical engineering projects, accurate evaluation of their mechanical properties is crucial.

[0003] Currently, the mechanical strength testing of building panels, such as compressive strength, tensile strength, and flexural strength, is typically conducted under ambient temperature conditions. Some advanced tests may involve uniform high- or low-temperature environments to assess the material's performance under a single extreme temperature. However, in actual building service, especially in high-altitude, high-latitude, cold regions or areas with large seasonal temperature differences, the exterior walls or roof panels used as building envelopes may be exposed to extremely low temperatures for extended periods, while the interior remains at a higher indoor temperature, even in close contact with the heating elements of indoor heating systems, resulting in a significant temperature difference between the two sides of the panel. This complex environmental condition presents new and more stringent evaluation requirements for the mechanical properties of novel thermal insulation panels.

[0004] However, existing technologies have significant shortcomings in meeting the aforementioned assessment requirements. First, the constituent materials of many new insulation panels (such as the foam core in SIPs, the barrier film in VIPs, and the resin matrix of some composite panels) exhibit a significant decrease in toughness at low temperatures, exhibiting low-temperature brittleness, leading to reduced strength and impact resistance. Traditional room-temperature testing cannot reflect this performance degradation, potentially resulting in inaccurate assessments of the actual load-bearing capacity and impact resistance of the insulation panels. Second, when a temperature gradient exists between the two sides of an insulation panel, thermal stress caused by thermal expansion and contraction is generated within the panel. For composite insulation panels, the difference in thermal expansion coefficients between different material layers is even greater, potentially leading to greater interfacial thermal stress. This thermal stress is superimposed on the mechanical stress caused by external mechanical loads (such as wind loads, snow loads, and self-weight), forming a complex composite stress state. Existing uniform temperature testing cannot simulate the impact of this coupling effect of thermal and mechanical stress on the overall strength and interfacial properties (such as delamination and debonding) of the insulation panel. Finally, existing strength testing equipment, such as traditional universal testing machines, typically lacks a dedicated structure that can simultaneously provide a precise low-temperature environment and a controllable temperature gradient, while also integrating mechanical loading functions. This results in a gap in the evaluation of the mechanical properties of new thermal insulation panels under extreme environmental conditions, posing potential risks to building design, material selection, and engineering safety. Summary of the Invention

[0005] To address the aforementioned shortcomings, the present invention aims to provide a strength testing device for building panels, thereby solving the problem in the prior art that it is impossible to accurately evaluate the mechanical properties of building panels under conditions of temperature difference.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A strength testing device for building panels, comprising:

[0008] A loading mechanism is used to apply mechanical loads to a plate sample and measure the load and deformation. The loading mechanism includes a loading head, a loading rod, and a driving component. The loading head is used to apply mechanical loads to the plate sample. The loading rod is used to connect the loading head and the driving component. The driving component is used to provide driving force to drive the loading rod to drive the loading head to apply mechanical loads.

[0009] The box is covered with an insulation layer for heat insulation of the internal and external spaces of the box. The box is provided with a low temperature zone and a high temperature zone, which are separated by a plate sample. The loading head is located inside the box, the driving component is located outside the box, and the loading rod passes through the box and is sealed to the box.

[0010] A sample sealing structure is provided for sealing the edge of the plate sample with the housing.

[0011] A refrigeration system connected to the low-temperature zone, the refrigeration system being used to cool the low-temperature zone;

[0012] A heating system, the heating system being connected to the high-temperature zone, the heating system being used to raise the temperature of the high-temperature zone;

[0013] A control and data acquisition system is electrically connected to the loading mechanism, the refrigeration system, and the heating system. The control and data acquisition system is used to set temperature parameters, loading parameters, display detection data in real time, and perform data storage and analysis.

[0014] Preferably, the sample sealing structure includes a clamping mechanism and two frames. The two frames are arranged opposite each other at the output of the clamping mechanism. A sealing frame is provided on the opposite surface of the two frames. A test hole is provided in the middle of the sealing frame. The sealing frame is used to seal the edge of the plate sample. The sealing frame is also used to seal between the frame and the box. The clamping mechanism is used to drive the two frames to move away from and towards each other. The movement of the frames is used to make the sealing frame adhere to or leave the plate sample.

[0015] Preferably, the sealing frame is made of low-temperature silicone rubber foam material with a density ranging from 10 kg / m³ to 50 kg / m³ and a compression modulus of less than 0.1 MPa at 25% compression.

[0016] Preferably, the sample sealing structure is provided with a first loading channel, which is disposed between the two sealing frames on both sides. The first loading channel is composed of two sealing frames fastened together, and the first loading channel is used to prevent the loading rod from being lifted.

[0017] Preferably, the box body includes a first half-box and a second half-box, which are fastened together opposite to each other. The first half-box and the second half-box are openable and closable, and the sample sealing structure is disposed at the fastening point between the first half-box and the second half-box.

[0018] Preferably, the housing is provided with a second loading channel, which is located on both sides of the sample sealing structure, and the second loading channel is used to avoid the loading rod.

[0019] Preferably, the box body includes a third half box and a fourth half box, the box body is formed by the third half box and the fourth half box being fastened together opposite each other, the third half box and the fourth half box are openable and closable, and the second loading channel is disposed at the fastening point between the first half box and the second half box;

[0020] It also includes two rotating brackets, which are arranged opposite each other on both sides of the box. The third half-box and the fourth half-box are respectively connected to the rotating brackets on both sides. The rotating brackets can drive the third half-box and the fourth half-box on them to move closer or further away from each other. The rotating brackets can also drive the third half-box and the fourth half-box on them to rotate around the loading head. The rotation of the third half-box and the fourth half-box is used to adjust the position of the second loading channel and the sample sealing structure.

[0021] Preferably, the clamping mechanism includes a telescopic cylinder and a connecting rod. The output part of the telescopic cylinder is connected to the frame through the connecting rod. The connecting rod is provided with a collar, which is sleeved on the rotating bracket and can move along the length direction of the rotating bracket. The telescopic cylinder is used to drive the connecting rod to drive the box to open and close.

[0022] Preferably, the refrigeration system is a cascade refrigeration system, and the heating system is a PTC ceramic heater or a nickel-chromium wire heater;

[0023] It also includes an air circulation system, which includes a circulation fan and a heat-insulating hose. The housing is provided with several heat exchange holes. The heat-insulating hose is used to connect the heat exchange holes to the refrigeration / heating system. The circulation fan is used to drive air to circulate in the housing and the refrigeration / heating system.

[0024] It also includes several thermocouples, which are installed inside the housing and electrically connected to the control and data acquisition system. The heating system and the cooling system achieve temperature control through the feedback of the thermocouples.

[0025] Preferably, the outer side of the loading rod is covered with heat-insulating material.

[0026] The technical solution provided by this invention may include the following beneficial effects:

[0027] 1. By placing the loading head inside the chamber, the mechanical load on the board sample is ensured to withstand the temperature difference at the interface between the low-temperature and high-temperature zones. This allows for the acquisition of mechanical performance data that better reflects actual application scenarios, improving the representativeness and reliability of the test results. It also solves the problem of accurately evaluating the mechanical properties of boards under controllable temperature difference conditions in existing technologies. This provides comprehensive experimental evidence for in-depth research on the performance of building boards in extreme environments and is of great significance for the research, optimization, and quality control of building materials.

[0028] 2. The sample sealing structure applies pressure to the edge of the plate sample and the sealing frame through a clamping mechanism, causing the sealing frame to fit tightly against the sample edge and the sealing surface inside the housing. The two sides of the plate sample are exposed to the low-temperature zone and the high-temperature zone respectively through the test holes of the two side sealing frames. This design effectively achieves physical and thermal isolation between the low-temperature zone and the high-temperature zone, preventing heat conduction and convection. At the same time, its adjustability enhances the compatibility of the device with plate samples of different thicknesses and simplifies the sample installation and positioning operation.

[0029] 3. Low-temperature silicone rubber foam provides excellent thermal insulation performance, enhancing the insulation effect. Using low-compression modulus and wide-temperature-range elasticity low-temperature silicone rubber foam as the sealant effectively solves the problem of traditional sealing frames hardening and cracking at extreme temperatures, ensuring reliable sealing even in low-temperature environments such as -60℃. Its low compressive modulus characteristic minimizes the force applied to the edges of the plate sample during clamping, avoiding interference from additional stress on mechanical test results and ensuring data accuracy.

[0030] 4. By using low-temperature silicone rubber foam material, the loading head can move and remain sealed within the sealed frame during load testing, with minimal impact on the load test results. When higher test accuracy is required, precise calibration can be performed through no-load testing, solving the problem that the sealed frame cannot be adapted to loading heads of different shapes.

[0031] 5. By reserving a first loading channel between the sealing frames, the loading rod can smoothly pass through the sealing frames while maintaining the sealing integrity inside the box. This allows the loading head to flexibly drive the loading head to perform mechanical tests parallel to the surface of the plate specimen, such as tensile strength tests, thus enabling the strength testing device to perform mechanical tests parallel to the surface of the plate.

[0032] 6. The chamber adopts a split, openable design, with the sample sealing structure positioned between the first and second halves of the chamber. This significantly simplifies the installation, positioning, and replacement of plate samples. Furthermore, the chamber can be fitted onto the loading rod without disassembling the loading head, resolving the cumbersome and time-consuming operation issues of traditional integrated insulated chambers. This structure improves testing efficiency and operational convenience, while also facilitating post-test cleaning and routine maintenance.

[0033] 7. By providing independent second loading channels on both sides of the chamber, a convenient loading path is offered for mechanical testing perpendicular to the material's direction. For example, during bending strength or compression tests, the loading rod can directly apply a vertical load to the specimen. This design enhances the device's versatility, enabling it to meet a wider range of mechanical performance testing needs. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the assembly of the housing and the loading rod according to an embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram illustrating the usage state of another embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram of the test state according to an embodiment of the present invention.

[0038] The components include: loading mechanism 1, loading head 11, loading rod 12, box 2, first half box 21, second half box 22, third half box 23, fourth half box 24, insulation layer 3, sample sealing structure 4, frame 41, sealing frame 42, test hole 420, first loading channel 51, second loading channel 52, heat insulation hose 6, and rotating bracket 7. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0041] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0044] A strength testing device for building panels, comprising:

[0045] The loading mechanism 1 is used to apply mechanical load to the plate sample and measure the load and deformation. The loading mechanism 1 includes a loading head 11, a loading rod 12 and a driving component. The loading head 11 is used to apply mechanical load to the plate sample. The loading rod 12 is used to connect the loading head 11 and the driving component. The driving component is used to provide driving force to drive the loading rod 12 to drive the loading head 11 to apply mechanical load.

[0046] The box body 2 is covered with a heat insulation layer 3, which is used for heat insulation of the inner and outer spaces of the box body 2. The box body 2 has a low temperature zone and a high temperature zone inside, which are separated by a plate sample. The loading head 11 is located inside the box body 2, the driving component is located outside the box body 2, and the loading rod 12 passes through the box body 2 and is sealed to the box body 2.

[0047] The sample sealing structure 4 is used to seal the edge of the plate sample with the box body 2.

[0048] A refrigeration system connected to the low-temperature zone, the refrigeration system being used to cool the low-temperature zone;

[0049] A heating system, the heating system being connected to the high-temperature zone, the heating system being used to raise the temperature of the high-temperature zone;

[0050] A control and data acquisition system is electrically connected to the loading mechanism 1, the refrigeration system, and the heating system. The control and data acquisition system is used to set temperature parameters, loading parameters, display detection data in real time, and perform data storage and analysis.

[0051] like Figure 1As shown, the loading head 11 is placed inside the chamber 2 to ensure that the plate sample bears mechanical load under the temperature difference at the interface between the low temperature zone and the high temperature zone, thereby obtaining mechanical performance data that are more consistent with actual application scenarios, improving the representativeness and reliability of the test results, solving the problem that the mechanical properties of the plate cannot be accurately evaluated under controllable temperature difference conditions in the existing technology, and providing comprehensive experimental basis for in-depth research on the performance of building plates in extreme environments, which is of great significance for the research and development, optimization and quality control of building materials.

[0052] The strength testing device integrates an independent refrigeration system, heating system, and control and data acquisition system, realizing a fully automated process from temperature parameter setting and mechanical load application to real-time data monitoring, storage, and analysis, significantly improving testing efficiency.

[0053] In the specific implementation, after the plate sample is installed on the sample sealing structure 4, the sample sealing structure 4 is then completely sealed with the housing 1. Subsequently, the test load parameters and temperature parameters are manually set in the control and data acquisition system. The control and data acquisition system then activates the cooling and heating systems. After the temperature stabilizes, the load test automatically begins. The drive component drives the loading head to apply the load, and the load sensor in the drive component measures the load data and transmits it to the control and data acquisition system for recording. After the test, the control and data acquisition system fits the data into a curve for analysis. The data fitting process can refer to conventional mechanical property testing methods in existing technologies.

[0054] The attached figure only shows a schematic diagram of the position of the loading head 11. The electrical connection structure and the fixing structure of the plate specimen are not shown in the attached figure. The mechanical property tests involved are all existing technologies and will not be described in detail here. It is sufficient to achieve the mechanical property test of the plate specimen.

[0055] Preferably, the sample sealing structure 4 includes a clamping mechanism and two frames 41. The two frames 41 are arranged opposite each other at the output of the clamping mechanism. A sealing frame 42 is provided on the opposite surface of the two frames 41. A test hole 420 is provided in the middle of the sealing frame 42. The sealing frame 42 is used to seal the edge of the plate sample. The sealing frame 42 is also used to seal between the frame 41 and the box 2. The clamping mechanism is used to drive the two frames 41 to move away from and towards each other. The movement of the frame 41 is used to make the sealing frame 42 close to or away from the plate sample.

[0056] The sample sealing structure 4 applies pressure to the edge of the plate sample and the sealing frame 42 through a clamping mechanism, causing the sealing frame 42 to fit tightly against the edge of the sample and the sealing surface inside the housing 2. The two sides of the plate sample are exposed to the low-temperature zone and the high-temperature zone respectively through the test holes 420 of the two side sealing frames 42. This design effectively achieves physical and thermal isolation between the low-temperature zone and the high-temperature zone, preventing heat conduction and convection. At the same time, its adjustability enhances the compatibility of the device with plate samples of different thicknesses and simplifies the installation and positioning of the sample.

[0057] Preferably, the sealing frame 42 is made of low-temperature silicone rubber foam material with a density ranging from 10 kg / m³ to 50 kg / m³ and a compression modulus of less than 0.1 MPa at 25% compression.

[0058] Low-temperature silicone rubber foam provides excellent thermal insulation performance, enhancing the insulation effect. Using low-compression modulus and wide-temperature-range elasticity low-temperature silicone rubber foam as the sealant effectively solves the problem of hardening and cracking of traditional sealing frames 42 at extreme temperatures, ensuring reliable sealing even in low-temperature environments such as -60℃. Its low compressive modulus characteristic minimizes the force applied to the edges of the plate sample during clamping, avoiding interference from additional stress on mechanical test results and ensuring data accuracy.

[0059] It is worth noting that, to avoid the sealing frame 42 affecting the movement of the loading head 12 when applying load, space for the loading head to move can be reserved in the sealing frame 42. However, this would result in poor applicability of the sealing frame, requiring more specifications of sealing frames to accommodate loading heads of different shapes. By using low-temperature silicone rubber foam material, the loading head can move within the sealing frame 42 and remain sealed during load testing, with minimal impact on the load test results. When higher test accuracy is required, precise calibration can be performed through no-load tests, solving the problem of the sealing frame not being able to accommodate loading heads of different shapes.

[0060] Preferably, the sample sealing structure 4 is provided with a first loading channel 51, which is disposed between the two sealing frames 42 on both sides. The first loading channel 51 is formed by the two sealing frames 42 fastened together, and the first loading channel 51 is used to avoid the loading rod 12.

[0061] like Figure 2 As shown, by reserving a first loading channel 51 between the sealing frames 42, the loading rod 12 can smoothly pass through the sealing frame 42, while maintaining the sealing integrity inside the box 2, so that it can flexibly drive the loading head 11 to perform mechanical tests parallel to the plate surface direction of the plate specimen, such as tensile strength tests, so as to realize the strength testing device to perform mechanical tests parallel to the plate surface direction.

[0062] Preferably, the box body 2 includes a first half box 21 and a second half box 22. The box body 2 is formed by the first half box 21 and the second half box 22 being fastened together. The first half box 21 and the second half box 22 are openable and closable. The sample sealing structure 4 is disposed at the fastening point between the first half box 21 and the second half box 22.

[0063] The chamber 2 adopts a split, openable design, with the sample sealing structure 4 positioned between the first half-chamber 21 and the second half-chamber 22. This significantly simplifies the installation, positioning, and replacement of the plate sample, and allows the chamber to be fitted onto the loading rod without disassembling the loading head, solving the problems of cumbersome and time-consuming operation associated with traditional integrated insulated chambers. This structure improves testing efficiency and operational convenience, while also facilitating cleaning and routine maintenance of the chamber 2 after the test.

[0064] Preferably, the housing 2 is provided with a second loading channel 52, which is located on both sides of the sample sealing structure 4, and the second loading channel 52 is used to avoid the loading rod 12.

[0065] like Figure 3 As shown, by providing independent second loading channels 52 on both sides of the housing 2, a convenient loading path is provided for mechanical testing perpendicular to the plate direction. For example, during bending strength or compression tests, the loading rod 12 can directly apply a vertical load to the specimen. This design enhances the versatility of the device, enabling it to adapt to more diverse mechanical performance testing needs.

[0066] Preferably, the loading mechanism 1 is a universal testing machine, including a force sensor and a displacement sensor.

[0067] Using a mature and high-precision universal testing machine as the loading mechanism 1 fully leverages its proven reliability and accuracy in the field of mechanical testing. Built-in force and displacement sensors provide high-precision, high-resolution load and deformation measurement data, ensuring the scientific validity and repeatability of mechanical test results while reducing the device's development costs.

[0068] Preferably, the box body 2 includes a third half box 23 and a fourth half box 24. The box body 2 is formed by the third half box 23 and the fourth half box 24 being fastened together. The third half box 23 and the fourth half box 24 are openable and closable. The second loading channel 52 is disposed at the fastening point between the first half box 21 and the second half box 22.

[0069] It also includes two rotating brackets 7, which are arranged opposite each other on both sides of the box 2. The third half box 23 and the fourth half box 24 are respectively connected to the rotating brackets 7 on both sides. The rotating brackets 7 can drive the third half box 23 and the fourth half box 24 on them to move closer or further away from each other. The rotating brackets 7 can also drive the third half box 23 and the fourth half box 24 on them to rotate around the loading head 11. The rotation of the third half box 23 and the fourth half box 24 is used to adjust the position of the second loading channel 52 and the sample sealing structure 4.

[0070] In one embodiment, two rotating brackets are respectively mounted on the rotating shafts on the columns on both sides of the universal testing machine. By manually pushing, pulling or rotating the rotating brackets, the rotating brackets can drive the third and fourth half-boxes on them to open and close and rotate around the loading head.

[0071] The second loading channel 52 is positioned between the third half-box 23 and the fourth half-box 24. The rotating bracket 7 is manually pushed to open, close, and rotate, allowing for convenient adjustment of the position of the second loading channel 52 on the box 2. When the second loading channel 52 is needed, it is adjusted to the position of the loading rod 12. At this time, the sample sealing structure 4 rotates along with the box 2, making the plate sample on it perpendicular to the loading rod 12. This facilitates the adjustment of the test direction of the plate sample, making the installation of the plate sample more convenient and improving the testing efficiency.

[0072] In a more preferred embodiment, the third housing is composed of a first housing and a second housing that are fastened together opposite each other, and the fourth housing is composed of a third housing and a fourth housing that are fastened together opposite each other. The sample sealing structure is located between the first housing and the second housing, and the first housing and the second housing are openable and closable. The sample sealing structure is located between the third housing and the fourth housing, and the third housing and the fourth housing are openable and closable.

[0073] This structure allows the first and second loading channels to be set on the same housing simultaneously. When adjusting the direction of force applied to the plate specimen, the first, second, third, and fourth housings are fully opened, and the housing is rotated to adjust the corresponding first or second loading channel to the position of the loading rod, thereby further improving testing efficiency.

[0074] Preferably, the frame 41 includes a first half-frame and a second half-frame, the frame 41 being formed by the first half-frame and the second half-frame, the shape of the first half-frame matching the shape of the first half-box 21, and the shape of the second half-frame matching the shape of the second half-box 22.

[0075] Preferably, it also includes a sealing plug, the cross-sectional dimensions of which are the same as those of the loading rod 12, and the sealing plug is used to seal the first loading channel 51 or the second loading channel 52 that is not used in the test.

[0076] When the housing 2 has both a first loading channel 51 and a second loading channel 52, a sealing plug is required to seal the first loading channel 51 or the second loading channel 52 that is not used in the current test.

[0077] Preferably, the frame 41 includes a third half-frame and a fourth half-frame, the frame 41 being enclosed by the third half-frame and the fourth half-frame, the shape of the third half-frame matching the shape of the third half-box 23, and the shape of the fourth half-frame matching the shape of the fourth half-box 24.

[0078] The frame 41 is designed to be openable and closable, allowing it to be opened and closed in conjunction with the housing 2, thereby further improving testing efficiency.

[0079] Preferably, the clamping mechanism includes a telescopic cylinder and a connecting rod. The output part of the telescopic cylinder is connected to the frame 41 through the connecting rod. The connecting rod is provided with a collar, which is sleeved on the rotating bracket 7 and can move along the length direction of the rotating bracket 7. The telescopic cylinder is used to drive the connecting rod to drive the housing 4 to open and close.

[0080] In a specific embodiment, the telescopic cylinder is fixed to the rotating bracket 7. With this structure, the telescopic cylinder realizes the opening and closing movement between the two frames 41. The frame 41 is installed on the rotating bracket 7 through the collar on the connecting rod, so that the frame 41 can rotate with the rotating bracket 7.

[0081] Preferably, the refrigeration system is a cascade refrigeration system, and the heating system is a PTC ceramic heater or a nickel-chromium wire heater;

[0082] It also includes an air circulation system, which includes a circulation fan and a heat-insulating hose 6. The housing 2 is provided with several heat exchange holes. The heat-insulating hose 6 is used to connect the heat exchange holes to the refrigeration / heating system. The circulation fan is used to drive air to circulate in the housing 2 and the refrigeration / heating system.

[0083] It also includes several thermocouples, which are installed inside the housing 2. The thermocouples are electrically connected to the control and data acquisition system. The heating system and the cooling system achieve temperature control through the feedback of the thermocouples.

[0084] The cascade cooling system efficiently and stably lowers the temperature in the low-temperature zone to extremely low levels (e.g., below -60°C), meeting the stringent requirements of low-temperature environment simulation. The heating system uses PTC ceramic heaters or nickel-chromium wire heaters, which offer advantages such as high heating efficiency, fast response, and compact size. The PTC heater also features self-limiting temperature characteristics, enhancing safety. Independent air circulation systems are provided for the low-temperature and high-temperature zones, ensuring uniform internal temperature distribution through forced convection and providing precise and stable ambient temperatures for the plate samples.

[0085] By arranging multiple thermocouples inside the environmental simulation chamber and feeding their monitoring data back to the control system in real time, closed-loop precise temperature control of the low-temperature and high-temperature zones is achieved. This multi-point monitoring and feedback mechanism ensures rapid response, high stability, and minimal fluctuation range in temperature across each zone, providing a highly controllable and stable temperature gradient environment for the plate samples, which is crucial for obtaining accurate test data.

[0086] In a specific embodiment, the heat-insulating hose 6 is a corrugated pipe with heat-insulating material, which is convenient for opening, closing and rotating the housing 2.

[0087] Preferably, it also includes at least two laser temperature probes, which are used to measure the surface temperature on both sides of the plate sample.

[0088] Monitoring the surface temperature of the plate sample can better confirm the actual temperature of the plate sample and provide a reference for the test results.

[0089] Preferably, the outer side of the loading rod 12 is covered with heat-insulating material.

[0090] The loading rod 12, acting as a physical channel connecting the interior and exterior of the chamber 2 and simultaneously contacting both the low-temperature and high-temperature zones, is a potential thermal bridge, potentially leading to instability in the internal temperature field of the chamber 2. By covering the outside of the loading rod 12 with thermal insulation material, heat loss along the loading rod 12 is effectively reduced, significantly mitigating the thermal bridging effect. This improvement enhances the temperature control accuracy and stability of the environmental simulation chamber, reduces energy consumption, and ensures that the sample remains in a precisely set temperature environment throughout the testing process. In a specific embodiment, the loading rod 12 is covered with a thermally insulated plastic sleeve, the smooth surface of which facilitates a seal between the sleeve and the chamber 2.

[0091] Other configurations and operations according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0092] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0093] Although embodiments of the invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.

Claims

1. A strength detection device for a building board, characterized by include: A loading mechanism is used to apply mechanical loads to a plate sample and measure the load and deformation. The loading mechanism includes a loading head, a loading rod, and a driving component. The loading head is used to apply mechanical loads to the plate sample. The loading rod is used to connect the loading head and the driving component. The driving component is used to provide driving force to drive the loading rod to drive the loading head to apply mechanical loads. The box is covered with an insulation layer for heat insulation of the internal and external spaces of the box. The box is provided with a low temperature zone and a high temperature zone, which are separated by a plate sample. The loading head is located inside the box, the driving component is located outside the box, and the loading rod passes through the box and is sealed to the box. A sample sealing structure is provided for sealing the edge of the plate sample with the housing. A refrigeration system connected to the low-temperature zone, the refrigeration system being used to cool the low-temperature zone; A heating system, the heating system being connected to the high-temperature zone, the heating system being used to raise the temperature of the high-temperature zone; A control and data acquisition system is electrically connected to the loading mechanism, the refrigeration system, and the heating system. The control and data acquisition system is used to set temperature parameters, loading parameters, display detection data in real time, and perform data storage and analysis.

2. The strength detection apparatus according to claim 1, characterized by: The sample sealing structure includes a clamping mechanism and two frames. The two frames are arranged opposite each other at the output of the clamping mechanism. A sealing frame is provided on the opposite side of the two frames. A test hole is provided in the middle of the sealing frame. The sealing frame is used to seal the edge of the plate sample. The sealing frame is also used to seal between the frame and the box. The clamping mechanism is used to drive the two frames to move away from and towards each other. The movement of the frames is used to make the sealing frame fit tightly against or leave the plate sample.

3. The strength detection apparatus according to claim 2, characterized by: The sealing frame is made of low-temperature silicone rubber foam material with a density ranging from 10 kg / m³ to 50 kg / m³ and a compression modulus of less than 0.1 MPa at 25% compression.

4. The strength testing device according to claim 2, characterized in that: The sample sealing structure is provided with a first loading channel, which is located between the two sealing frames on both sides. The first loading channel is composed of two sealing frames fastened together, and is used to prevent the loading rod from being lifted.

5. The strength testing device according to claim 2, characterized in that: The box body includes a first half box and a second half box, which are formed by the first half box and the second half box being fastened together. The first half box and the second half box are openable and closable. The sample sealing structure is provided at the fastening point between the first half box and the second half box.

6. The strength testing device according to claim 5, characterized in that: The box is provided with a second loading channel, which is located on both sides of the sample sealing structure. The second loading channel is used to avoid the loading rod.

7. The strength testing device according to claim 6, characterized in that: The box body includes a third half box and a fourth half box, which are formed by the third half box and the fourth half box being fastened together. The third half box and the fourth half box are openable and closable. The second loading channel is located at the fastening point between the first half box and the second half box. It also includes two rotating brackets, which are arranged opposite each other on both sides of the box. The third half-box and the fourth half-box are respectively connected to the rotating brackets on both sides. The rotating brackets can drive the third half-box and the fourth half-box on them to move closer or further away from each other. The rotating brackets can also drive the third half-box and the fourth half-box on them to rotate around the loading head. The rotation of the third half-box and the fourth half-box is used to adjust the position of the second loading channel and the sample sealing structure.

8. The strength testing device according to claim 7, characterized in that: The clamping mechanism includes a telescopic cylinder and a connecting rod. The output part of the telescopic cylinder is connected to the frame through the connecting rod. The connecting rod is provided with a collar, which is sleeved on the rotating bracket and can move along the length direction of the rotating bracket. The telescopic cylinder is used to drive the connecting rod to drive the box to open and close.

9. The strength testing device according to claim 1, characterized in that: The refrigeration system is a cascade refrigeration system, and the heating system is a PTC ceramic heater or a nickel-chromium wire heater. It also includes an air circulation system, which includes a circulation fan and a heat-insulating hose. The housing is provided with several heat exchange holes. The heat-insulating hose is used to connect the heat exchange holes to the refrigeration / heating system. The circulation fan is used to drive air to circulate in the housing and the refrigeration / heating system. It also includes several thermocouples, which are installed inside the housing and electrically connected to the control and data acquisition system. The heating system and the cooling system achieve temperature control through the feedback of the thermocouples.

10. The strength testing device according to claim 1, characterized in that: The outer side of the loading rod is covered with heat-insulating material.

Images