Device for testing dynamic and static stiffness and fatigue resistance of base plate

Abstract

The utility model relates to a base plate dynamic and static stiffness test and fatigue resistance test device. The base plate dynamic and static stiffness test and fatigue resistance test device comprises a supporting table, a bearing frame, a heat preservation box, a loading test assembly, a loading assembly, a displacement test assembly and a temperature control assembly, wherein the bearing frame, the heat preservation box and the loading test assembly are arranged on the supporting table; the loading assembly is supported on the bearing frame; the heat preservation box is located below the bearing frame. The loading test assembly and the loading assembly are oppositely arranged below the loading assembly; wherein a part of the loading test assembly is arranged in the thermal insulation box, and a part of the loading assembly extends into the thermal insulation box; the displacement test assembly is arranged around the loading test assembly; the displacement testing assembly is in contact with the part, located outside the heat preservation box, of the loading testing assembly and used for measuring the vertical displacement generated by the loading testing assembly under the loading effect of the loading assembly.

Description

Technical Field

[0001] The utility model relates to the field of dynamic and static stiffness testing, in particular to a pad dynamic and static stiffness testing and fatigue resistance testing device. Background Art

[0002] As an important indicator to measure the mechanical properties of the pad, dynamic and static stiffness is used to reflect the pad's ability to resist deformation under dynamic and static loads. It can be seen that it directly affects the performance and life of the pad during use.

[0003] The static and dynamic stiffness tests of the pads are conducted using specialized testing equipment. The tests require an applied load of 100kN or greater, and are conducted in temperatures ranging from -40°C to 80°C. Fatigue testing is also conducted at room temperature. The pads are subjected to a given quantitative stress and their strain is measured under different conditions. The specific testing methods follow the setup conditions specified in Appendix A of TB / T 3395.1 for the static and dynamic stiffness tests, Appendix B of TB / T 3395.1 for the dynamic stiffness tests, and Appendix C of TB / T 3395.1 for the fatigue properties tests. There are two main types of dynamic and static stiffness testing devices currently available. One type of dynamic and static stiffness testing device does not have an insulation structure, which means that it can only be tested at the current ambient temperature. Its test conditions are relatively simple and difficult to meet the actual use status of the pad. The other type of dynamic and static stiffness testing device simply sets an insulation box outside the test component, and its measuring device for measuring the deformation displacement of the pad needs to be set in the insulation box or on the pressure device to indirectly measure the deformation of the pad through the displacement detection of the pressure device. Among them, the method of setting the displacement measuring device in the insulation box often causes the ambient temperature of the measuring pad to exceed the applicable range of the displacement measuring device, which easily leads to a large measurement error of the displacement measuring device, and even the problem of failure of the displacement measuring device. Moreover, the method of setting the displacement measuring device in the insulation box also has the disadvantage of inconvenience in operation and observation. As for the indirect measurement method, since it does not directly measure the deformation of the pad, it is more susceptible to the influence of other equipment and produces cumulative errors, resulting in inaccurate measurement results.

[0004] In addition, the existing dynamic and static stiffness testing device does not have a corresponding temperature control and insulation structure, which makes it difficult to meet the actual use conditions of the pad, resulting in a single measurement result without corresponding reference significance. Summary of the Invention

[0005] The purpose of the utility model is to provide a device for testing the dynamic and static stiffness and fatigue resistance of a pad.

[0006] To achieve the above-mentioned purpose of the utility model, the utility model provides a pad dynamic and static stiffness test and fatigue resistance test device, comprising: a support platform, a load-bearing frame, an insulation box and a loading test assembly arranged on the support platform, a loading assembly supported on the load-bearing frame, a displacement test assembly, and a temperature control assembly connected to the insulation box;

[0007] The thermal insulation box is located below the carrier;

[0008] The loading test assembly is arranged below the loading assembly and opposite to the loading assembly; wherein a portion of the loading test assembly is arranged in the heat preservation box, and a portion of the loading assembly extends into the heat preservation box;

[0009] The displacement test assembly is arranged around the loading test assembly;

[0010] The displacement test assembly is in contact with a portion of the loading test assembly outside the thermal insulation box, and is used to measure the vertical displacement of the loading test assembly under the loading action of the loading assembly.

[0011] According to one aspect of the present invention, the loading test assembly includes: a supporting jig for carrying a pad to be tested, a fixed support for supporting the supporting jig, and a loading jig;

[0012] The loading fixture includes: a loading plate, a first guide post connected to the lower side of the loading plate, and an extension plate connected to the lower end of the first guide post;

[0013] The outer dimensions of the loading plate are larger than the outer dimensions of the supporting fixture;

[0014] A plurality of first guide posts are provided along the circumference of the loading plate;

[0015] The loading plate is arranged parallel to the extension plate;

[0016] The loading plate and the supporting jig are located in the heat preservation box, and the loading plate is located above the supporting jig;

[0017] The extension plate is outside the heat preservation box, and is arranged below the heat preservation box with a gap between the extension plate and the heat preservation box;

[0018] The first guide column passes through the bottom of the heat preservation box and is slidably connected to the heat preservation box;

[0019] The fixed support passes through the bottom of the heat preservation box and is connected to the supporting fixture.

[0020] According to one aspect of the present invention, in the horizontal direction, a portion of the extension plate exceeds the thermal insulation box.

[0021] According to one aspect of the present invention, in the horizontal direction, portions of the extension plate extending beyond the heat preservation box are symmetrically distributed on two opposite sides of the heat preservation box.

[0022] According to one aspect of the present invention, the loading plate and the extension plate are respectively metal plates;

[0023] The flatness of the loading plate is less than or equal to 0.05 mm;

[0024] The flatness of the extension plate is less than or equal to 0.05 mm.

[0025] According to one aspect of the present invention, the extension plate is provided with an avoidance hole;

[0026] The avoidance hole has an opening on one side of the extension plate;

[0027] The fixed support passes through the avoidance hole, and a gap is provided between the inner side wall of the avoidance hole and the fixed support;

[0028] The fixed support includes: a connecting base plate and a support column fixedly supported on the upper side of the connecting base plate;

[0029] At least a portion of the support column located outside the heat preservation box is covered with a first heat insulation sleeve.

[0030] According to one aspect of the present invention, the carrier frame includes: a guide column fixedly supported on the support platform, a carrier plate slidably connected to the guide column, and a hydraulic support connected to the lower side of the carrier plate;

[0031] Along the circumference of the support platform, a plurality of guide posts are arranged at intervals;

[0032] The hydraulic supports are symmetrically arranged on opposite sides of the bearing plate, with fixed ends thereof connected to the bearing plate and telescopic ends thereof abutting against the surface of the support platform;

[0033] The loading assembly includes: a loading drive and a pressure column;

[0034] The loading driver is fixedly supported on the upper side of the carrier plate, and the pressure column is connected to the loading driver;

[0035] The pressure column passes through the supporting plate and the top of the heat preservation box respectively, and the pressure column is slidably connected to the top of the heat preservation box.

[0036] According to one aspect of the present invention, a second heat-insulating sleeve is provided on the top of the heat-insulating box, and the pressure column is slidably connected to the second heat-insulating sleeve;

[0037] Two displacement test assemblies are provided outside the thermal insulation box;

[0038] The displacement test assembly includes: a fixed base, a connecting bracket installed on the fixed base, and a displacement measuring device installed on the connecting bracket;

[0039] The displacement measuring device is in contact with the upper side of the portion of the extension plate that extends beyond the heat preservation box;

[0040] In the horizontal direction, the positions where the two displacement measuring devices contact the extension plate are symmetrical.

[0041] According to one aspect of the present invention, the distance between the upper side of the extension plate and the bottom surface of the insulation box is greater than or equal to 20 mm;

[0042] The distance between the lower side of the extension plate and the connecting bottom plate is greater than or equal to 20 mm.

[0043] According to one aspect of the present invention, the temperature control assembly includes: a cooling source, a heating source, a temperature controller connected to the cooling source and the heating source, and a temperature sensor;

[0044] The refrigeration source is liquid nitrogen;

[0045] The heat source is hot air from an oven;

[0046] The temperature controller is installed on the outside of the insulation box;

[0047] The temperature sensor is arranged in the thermal insulation box;

[0048] The heat preservation box is provided with a cold source connecting pipe for connecting to the refrigeration source and a heat source connecting pipe for connecting to the heating source.

[0049] According to one solution of the present invention, the present invention can effectively meet the requirements of dynamic and static stiffness testing of the pad to be tested in a high temperature or low temperature environment through an optimized loading test assembly, and can also effectively lead the corresponding displacement measurement process outside the high temperature or low temperature environment (i.e., outside the insulation box). As a result, the displacement measurement process is fully separated from the high temperature or low temperature environment, thereby effectively avoiding the influence of the high temperature or low temperature environment on the accuracy and working stability of the displacement meter, and fully ensuring the measurement stability and measurement accuracy of the present invention.

[0050] According to one solution of the present invention, the extension plate can be symmetrically extended on two opposite sides of the insulation box to more conveniently arrange the displacement test components in a symmetrical position, which is beneficial to ensuring measurement accuracy. In addition, the symmetrical extension of the extension plate at both opposite ends can also effectively ensure the balance of the overall mass distribution of the extension plate, which is beneficial to ensuring the test accuracy of the entire test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a perspective view schematically showing a device for testing the dynamic and static stiffness and fatigue resistance of a pad according to an embodiment of the present invention;

[0052] Figure 2 is a perspective view schematically showing a device for testing the dynamic and static stiffness and fatigue resistance of a pad according to an embodiment of the present invention;

[0053] Figure 3 is a perspective view schematically showing a loading test assembly according to an embodiment of the present invention;

[0054] Figure 4 It is a partial cross-sectional view schematically showing a pad dynamic and static stiffness testing and fatigue resistance testing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0056] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.

[0057] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0058] Combine Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, according to an embodiment of the present invention, a pad dynamic and static stiffness test and fatigue resistance test device of the present invention includes: a support platform 11, a load-bearing frame 12, an insulation box 13 and a loading test component 14 arranged on the support platform 11, a loading component 15 supported on the load-bearing frame 12, a displacement test component 16, and a temperature control component 17 connected to the insulation box 13; in this embodiment, the support platform 11 is the load-bearing body of the entire device, which is used to support structures such as the load-bearing frame 12, the insulation box 13, the loading test component 14, and the displacement test component 16. Therefore, the structural size, structural strength, etc. of the support platform 11 can be matched according to the support needs of each structure to ensure the reliability and stability of the entire device. In this embodiment, the thermal insulation box 13 is located below the load-bearing frame 12; wherein, the thermal insulation box 13 is used to provide a high temperature or low temperature environment for the pad, and the loading test assembly 14 and the loading assembly 15 are used to provide dynamic and static stiffness test loads for the pad, and the thermal insulation box 13 is used to provide a normal temperature environment for the pad, and the loading test assembly 14 and the loading assembly 15 are used to provide alternating loads to the pad to achieve fatigue testing.

[0059] In this embodiment, the loading test component 14 is arranged opposite to the loading component 15 below the loading component 15; wherein, part of the loading test component 14 is arranged in the insulation box 13, and part of the loading component 15 extends into the insulation box 13; further, the displacement test component 16 is arranged around the loading test component 14; wherein, the displacement test component 16 is in contact with the part of the loading test component 14 outside the insulation box 13, and is used to measure the vertical displacement of the loading test component 14 under the loading action of the loading component 15.

[0060] Through the above-mentioned setting, the present invention can effectively meet the dynamic and static stiffness test of the pad to be tested in a high temperature or low temperature environment through the optimized design of the loading test component 14, and can also effectively lead the corresponding displacement measurement process outside the high temperature or low temperature environment (i.e., outside the insulation box 13). As a result, the displacement measurement process is fully separated from the high temperature or low temperature environment, thereby effectively avoiding the influence of the high temperature or low temperature environment on the accuracy and working stability of the displacement meter, and fully ensuring the measurement stability and measurement accuracy of the present invention.

[0061] Combine Figure 1 、 Figure 3 and Figure 4As shown, according to one embodiment of the present invention, the loading test assembly 14 includes: a supporting jig 141 for carrying the pad to be tested, a fixed support 142 for supporting the supporting jig 141, and a loading jig 143; in this embodiment, the pad to be tested is installed between the supporting jig 141 and the loading jig 143, wherein the supporting jig 141 is used to carry the pad to be tested, and the loading jig 143 is against the upper side of the pad to be tested, so that a load is applied to the loading jig 143 through the loading assembly 15 to achieve a dynamic and static stiffness test or fatigue test of the pad to be tested. In this embodiment, the supporting jig 141, the fixed support 142 and the loading jig 143 are all made of rigid materials, among which metal materials can be used. For example, it is made of 45# steel.

[0062] In this embodiment, the loading jig 143 includes: a loading plate 1431, a first guide column 1432 connected to the lower side of the loading plate 1431, and an extension plate 1433 connected to the lower end of the first guide column 1432; wherein, the loading plate 1431 and the supporting jig 141 are located in the insulation box 13, and the loading plate 1431 is located above the supporting jig 141, mainly used to bear the load of the loading assembly 15 and to apply pressure to the pad to be tested; wherein, the thickness of the loading plate 1431 can be set to 30 mm, and of course its thickness can also be set to greater than 30 mm, so as to ensure that it has sufficient thickness to achieve its own high strength, especially the thicker the thickness, the smaller the deformation of the material itself, thereby fully reducing the error caused by the measurement.

[0063] In this embodiment, the outer dimensions of loading plate 1431 are larger than those of support jig 141. Specifically, the projected area of ​​loading plate 1431 is larger than the projected area of ​​support jig 141. This ensures sufficient space around loading plate 1431 for mounting first guide posts 1432, preventing interference between first guide posts 1432 and support jig 141, and ensuring that loading plate 1431 can accommodate test pads of varying sizes. In this embodiment, loading plate 1431 can be configured as a rectangular plate. Accordingly, multiple first guide posts 1432 are provided along the circumference of loading plate 1431. Four detachable connections (e.g., threaded connections) are provided on loading plate 1431, arranged in a rectangular pattern.

[0064] In this embodiment, the extension plate 1433 is outside the insulation box 13, and the extension plate 1433 is arranged below the insulation box 13 with a gap therebetween; wherein, the loading plate 1431 is arranged parallel to the extension plate 1433; wherein, the extension plate 1433 can also be set as a rectangular plate, wherein the thickness of the loading plate 1431 can be set to 30 mm, and of course its thickness can also be set to be greater than 30 mm, so as to ensure that it has sufficient thickness to achieve its own high strength, thereby ensuring the overall flatness of the extension plate 1433, to avoid deformation of its own structure, and thus accurately and reliably transferring the displacement changes of the loading plate 1431 to the extension plate 1433, thereby realizing the precise measurement of vertical displacement changes by the utility model.

[0065] In this embodiment, the extension plate 1433 is detachably connected to the first guide column 1432 (for example, a threaded connection). Therefore, in order to install the extension plate 1433 outside the insulation box 13, the first guide column 1432 needs to pass through the bottom of the insulation box 13 and be slidably connected to the insulation box 13.

[0066] In this embodiment, in order to ensure the reliable and stable installation of the support fixture 141 in the heat preservation box 13, it is necessary to connect the fixed support 142 through the bottom of the heat preservation box 13 to the support fixture 141; wherein, the fixed support 142 uses a threaded connection to achieve the installation of the support fixture 141. Furthermore, in order to ensure the installation accuracy of the fixed support 142 and the support fixture 141, they can be positioned in a mutually interlocking manner at the connection position to ensure the coaxial accuracy between them, and then fixed with a threaded connection. Of course, in actual use, other installation methods can also be used, such as riveting, welding, direct threaded connection, etc.

[0067] Combine Figure 1 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the supporting jig 141 includes: a jig base for connecting to the fixed support 142 and a pad mounting seat connected to the upper side of the jig base; wherein, the jig base can also adopt a rectangular plate body, and the shape of the pad mounting seat can be set according to the shape of the pad to be tested, or the shape of the pad mounting seat can be set to a rectangular plate and its area is larger than the installed pad to be tested.

[0068] Combine Figure 1 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the thermal insulation box 13 can be a rectangular hollow box with a door that can be opened and closed on one side. In this embodiment, the bottom of the thermal insulation box 13 is fixedly connected to the support platform 11 using legs to provide a reliable and stable experimental environment.

[0069] Combine Figure 1 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, in the horizontal direction, part of the extension plate 1433 exceeds the heat preservation box 13. In the horizontal direction, the end of the length direction of the extension plate 1433 exceeds the heat preservation box 13.

[0070] Combine Figure 1 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, in the horizontal direction, the portion of the extension plate 1433 that extends beyond the insulation box 13 is symmetrically distributed on opposite sides of the insulation box 13; wherein, in the horizontal direction, the portions of the extension plate 1433 that extend beyond the insulation box 13 are stacked at both ends in the length direction, thereby achieving a symmetrical distribution of the portions that extend beyond the insulation box 13.

[0071] In this embodiment, in the horizontal direction, the length of the portion of the extension plate 1433 that extends beyond the heat preservation box 13 is at least 30 mm.

[0072] Through the above-mentioned arrangement, the extension plate 1433 can more conveniently arrange the displacement test assembly 16 in a symmetrical position by being symmetrically extended on both sides of the insulation box 13, which is beneficial to ensuring the measurement accuracy. In addition, the symmetrical extension at both ends of the extension plate 1433 can also effectively ensure the balance of the overall mass distribution of the extension plate 1433, which is beneficial to ensuring the test accuracy of the entire test process.

[0073] Through the above setting, the length of the portion of the extension plate 1433 extending out of the insulation box 13 is set within the above range, which can effectively ensure that there is sufficient space on the extension plate 1433 to select the area for measurement, greatly improving the flexibility of use of the utility model.

[0074] Combine Figure 1 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the loading plate 1431 and the extension plate 1433 are metal plates respectively; wherein the flatness of the loading plate 1431 is less than or equal to 0.05 mm; the flatness of the extension plate 1433 is less than or equal to 0.05 mm.

[0075] Through the above-mentioned setting, the measurement accuracy of the utility model is effectively guaranteed, especially the lower the flatness, the smaller the corresponding measurement error.

[0076] Combine Figure 1 、 Figure 3 and Figure 4As shown, according to one embodiment of the present invention, the extension plate 1433 is provided with an avoidance hole 1433a; wherein, the avoidance hole 1433a has an opening on one side of the extension plate 1433; specifically, when the extension plate 1433 is a rectangular plate, the avoidance hole 1433a is formed with an opening on one side of the extension plate 1433 in the width direction to avoid the portion of the extension plate 1433 that exceeds the thermal insulation box 13. Furthermore, the avoidance hole 1433a is arranged on the symmetry axis of the extension plate 1433, thereby making the mass distribution of the extension plate 1433 more balanced. In this embodiment, the fixed support 142 passes through the avoidance hole 1433a, and there is a gap between the inner side wall of the avoidance hole 1433a and the fixed support 142. By arranging the fixed support 142 and the avoidance hole 1433a with a gap, the influence of the fixed support 142 on the extension plate 1433 can be effectively avoided.

[0077] Combine Figure 1 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the fixed support 142 includes: a connecting base plate 142a and a support column 142b fixedly supported on the upper side of the connecting base plate 142a; wherein, the connecting base plate 142a can be a circular plate or a rectangular plate, and the support column 142b can be a cylinder or a rectangular column. In this embodiment, at least the portion of the support column 142b outside the heat preservation box 13 is covered with a first heat insulation sleeve 142a1; wherein, by providing the first heat insulation sleeve 142a1 on the support column 142b, heat exchange between the outside and the fixed support 142 is effectively avoided, which is beneficial to ensuring the test accuracy of the present invention. In this embodiment, the first heat insulation sleeve 142a1 can completely cover the outer surface of the support column 142b to fully ensure that the temperature of the entire support column 142b is uniform, which is beneficial to ensuring the test accuracy of the entire test device. Among them, the first thermal insulation sleeve 142a1 must fully fill the gap between the support column 142b and the thermal insulation box 13, which is beneficial to ensuring the stability of the environment in the thermal insulation box 13 and further beneficial to ensuring the measurement accuracy of this solution.

[0078] Combine Figure 1 、 Figure 3 and Figure 4As shown, according to one embodiment of the present invention, the carrier frame 12 includes: a guide column 121 fixedly supported on the support platform 11, a carrier plate 122 slidably connected to the guide column 121, and a hydraulic support connected to the lower side of the carrier plate 122; wherein, the surface of the guide column 121 is a smooth mirror surface to ensure reliable sliding between the carrier plate 122 and the guide column 121. In this embodiment, along the circumference of the support platform 11, a plurality of guide columns 121 are arranged at intervals; the hydraulic support is symmetrically arranged on opposite sides of the carrier plate 122, and its fixed end is connected to the carrier plate 122, and its telescopic end is against the table surface of the support platform 11; wherein, the provided hydraulic support can be used to control the height of the carrier plate 122 relative to the support platform 11, which is more beneficial for flexible adjustment of the position of the loading assembly 15.

[0079] Combine Figure 1 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the loading assembly 15 includes: a loading drive 151 and a pressure column 152; wherein the loading drive 151 is fixedly supported on the upper side of the load-bearing plate 122, and the pressure column 152 is connected to the loading drive 151; the pressure column 152 passes through the load-bearing plate 122 and the top of the heat preservation box 13 respectively, and the pressure column 152 is slidably connected to the top of the heat preservation box 13. In this embodiment, the loading drive 151 can be electrically driven or hydraulically driven. In this embodiment, the loading drive 151 can output dynamic loads (alternating loads) and static loads according to preset test conditions to meet the needs of dynamic and static stiffness testing.

[0080] Combine Figure 1 、 Figure 2 and Figure 4 As shown, according to one embodiment of the present invention, a second heat-insulating sleeve 13a is provided on the top of the heat-insulating box 13, and the pressure column 152 is slidably connected to the second heat-insulating sleeve 13a.

[0081] Through the above-mentioned setting, the second insulation sleeve 13a can effectively ensure the thermal insulation and air tightness between the insulation box 13 and the pressure column 152, which is beneficial to ensuring the environmental stability inside the insulation box 13 and reducing the heat exchange between the pressure column 152 and the outside world.

[0082] In this embodiment, two displacement measuring assemblies 16 are provided outside the insulated box 13. Each displacement measuring assembly 16 comprises a fixed base 161, a connecting bracket 162 mounted on the fixed base 161, and a displacement measuring device 163 mounted on the connecting bracket 162. In this embodiment, the displacement measuring devices 163 contact the upper side of the extension plate 1433, which extends beyond the insulated box 13. The contact positions of the two displacement measuring devices 163 with the extension plate 1433 are symmetrical in the horizontal direction. In this embodiment, the displacement measuring devices 163 can be linear sensors or mechanical measuring devices (such as dial indicators or micrometers).

[0083] Through the above-mentioned setting, the measurement accuracy of the utility model is effectively guaranteed and the reliability of the measurement is improved.

[0084] Combine Figure 1 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the distance between the upper side of the extension plate 1433 and the bottom surface of the insulation box 13 is greater than or equal to 20 mm; the distance between the lower side of the extension plate 1433 and the upper side of the connecting bottom plate 142a is greater than or equal to 20 mm.

[0085] Through the above arrangement, the movable space of the extension plate 1433 is effectively guaranteed, so that the utility model can fully adapt to the pads to be tested with different size parameters, and effectively ensure the applicability of the utility model.

[0086] like Figure 2 As shown, according to one embodiment of the present invention, the temperature control assembly 17 includes: a cooling source, a heating source, a temperature controller 171 connected to the cooling and heating sources, and a temperature sensor. In this embodiment, the cooling source is liquid nitrogen, and the heating source is hot air from an oven. The temperature controller 171 is mounted outside the insulated box 13, and the temperature sensor is located inside the insulated box 13. In this embodiment, the temperature controller 171 adjusts the temperature and flow rate of the cooling or heating source based on the temperature measured by the temperature sensor to control the temperature within the insulated box 13. The temperature controller 171 can be an electronic or mechanical controller and can be implemented based on existing, mature controllers. Accordingly, both the cooling and heating sources are established devices, and corresponding control functions can be achieved through communication with the temperature controller 171. In this embodiment, the insulated box 13 is provided with a cooling source connecting pipe 131 for connecting to the cooling source and a heating source connecting pipe 132 for connecting to the heating source. The heat preservation box 13 is connected to a cooling source via a cold source connecting pipe 131 , and the heat preservation box 13 is connected to a heating source via a heat source connecting pipe 132 .

[0087] To further illustrate this solution, the testing process of this solution is further elaborated.

[0088] Determine the type of the pad to be tested and the test conditions, wherein the test conditions include: temperature and loading pattern;

[0089] Open the door of the thermal insulation box 13;

[0090] Place the pad to be tested between the loading plate 1431 and the support fixture 141 in the loading test assembly 14;

[0091] Close the door of the thermal insulation box 13;

[0092] According to the determined test conditions, the temperature in the insulated box 13 is brought to a set temperature by the temperature control component 17, and the controller of the loading component 15 is set according to the loading rule; wherein, the controller of the loading component 15 is an existing mature device and is not described in detail here;

[0093] Displacement test assemblies 16 are provided at the portions of the extension plate 1433 extending beyond the heat preservation box 13 at opposite ends thereof, and the displacement test assemblies 16 are reset to zero;

[0094] The loading driver 151 applies a required pressure to the pad to be tested under a preset loading rule;

[0095] The displacement test component 16 reads and records the corresponding values, thereby completing the test of the pad to be tested.

[0096] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail, it should be understood that they can be implemented by adopting common devices and methods available in the art.

[0097] The above description is only one embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for testing the dynamic and static stiffness and fatigue resistance of a pad, characterized in that: include: A support platform (11), a carrier frame (12), an insulation box (13) and a loading test assembly (14) arranged on the support platform (11), a loading assembly (15) supported on the carrier frame (12), a displacement test assembly (16), and a temperature control assembly (17) connected to the insulation box (13); The heat preservation box (13) is located below the carrier frame (12); The loading test component (14) is arranged below the loading component (15) opposite to the loading component (15); wherein a portion of the loading test component (14) is arranged in the heat preservation box (13), and a portion of the loading component (15) extends into the heat preservation box (13); The displacement test assembly (16) is arranged around the loading test assembly (14); The displacement test assembly (16) contacts a portion of the loading test assembly (14) outside the heat preservation box (13) and is used to measure the vertical displacement of the loading test assembly (14) under the loading action of the loading assembly (15).

2. The device for testing the dynamic and static stiffness and fatigue resistance of the pad according to claim 1, characterized in that: The loading test assembly (14) comprises: a supporting jig (141) for carrying a pad to be tested, a fixed support (142) for supporting the supporting jig (141), and a loading jig (143); The loading fixture (143) comprises: a loading plate (1431), a first guide post (1432) connected to the lower side of the loading plate (1431), and an extension plate (1433) connected to the lower end of the first guide post (1432); The outer dimensions of the loading plate (1431) are greater than the outer dimensions of the supporting fixture (141); A plurality of first guide columns (1432) are provided along the circumference of the loading plate (1431); The loading plate (1431) and the extension plate (1433) are arranged in parallel; The loading plate (1431) and the supporting jig (141) are located in the heat preservation box (13), and the loading plate (1431) is located above the supporting jig (141); The extension plate (1433) is located outside the heat preservation box (13), and the extension plate (1433) is spaced apart from the heat preservation box (13) and is arranged below the heat preservation box (13); The first guide column (1432) passes through the bottom of the heat preservation box (13) and is slidably connected to the heat preservation box (13); The fixed support (142) passes through the bottom of the heat preservation box (13) and is connected to the supporting fixture (141).

3. The device for testing the dynamic and static stiffness and fatigue resistance of the pad according to claim 2, characterized in that: In the horizontal direction, a portion of the extension plate (1433) exceeds the thermal insulation box (13).

4. The device for testing the dynamic and static stiffness and fatigue resistance of the pad according to claim 3, characterized in that: In the horizontal direction, the portion of the extension plate (1433) that exceeds the heat preservation box (13) is symmetrically distributed on two opposite sides of the heat preservation box (13).

5. The device for testing the dynamic and static stiffness and fatigue resistance of the pad according to claim 4, characterized in that: The loading plate (1431) and the extension plate (1433) are respectively metal plates; The flatness of the loading plate (1431) is less than or equal to 0.05 mm; The flatness of the extension plate (1433) is less than or equal to 0.05 mm.

6. The device for testing the dynamic and static stiffness and fatigue resistance of the pad according to claim 5, characterized in that: The extension plate (1433) is provided with an avoidance hole (1433a); The avoidance hole (1433a) has an opening on one side of the extension plate (1433); The fixed support (142) passes through the avoidance hole (1433a), and a gap is provided between the inner side wall of the avoidance hole (1433a) and the fixed support (142); The fixed support (142) comprises: a connecting base plate (142a) and a supporting column (142b) fixedly supported on the upper side of the connecting base plate (142a); At least the portion of the support column (142b) outside the heat preservation box (13) is covered with a first heat insulation sleeve (142a1).

7. The device for testing the dynamic and static stiffness and fatigue resistance of the pad according to claim 6, characterized in that: The carrier frame (12) comprises: a guide column (121) fixedly supported on the support platform (11), a carrier plate (122) slidably connected to the guide column (121), and a hydraulic support connected to the lower side of the carrier plate (122); Along the circumference of the support platform (11), a plurality of guide columns (121) are arranged at intervals; The hydraulic supports are symmetrically arranged on opposite sides of the bearing plate (122), and their fixed ends are connected to the bearing plate (122), and their telescopic ends abut against the surface of the support platform (11); The loading assembly (15) includes: a loading drive (151) and a pressure column (152); The loading drive (151) is fixedly supported on the upper side of the bearing plate (122), and the pressure column (152) is connected to the loading drive (151); The pressure column (152) passes through the supporting plate (122) and the top of the heat preservation box (13) respectively, and the pressure column (152) is slidably connected to the top of the heat preservation box (13).

8. The device for testing the dynamic and static stiffness and fatigue resistance of the pad according to claim 7, characterized in that: A second heat-insulating sleeve (13a) is provided on the top of the heat-insulating box (13), and the pressure column (152) is slidably connected to the second heat-insulating sleeve (13a); Two displacement test assemblies (16) are provided outside the heat preservation box (13); The displacement test assembly (16) comprises: a fixed base (161), a connecting bracket (162) mounted on the fixed base (161), and a displacement measuring device (163) mounted on the connecting bracket (162); The displacement measuring device (163) contacts the upper side of the portion of the extension plate (1433) that extends beyond the heat preservation box (13); In the horizontal direction, the positions where the two displacement measuring devices (163) respectively contact the extension plate (1433) are symmetrical.

9. The device for testing the dynamic and static stiffness and fatigue resistance of the pad according to claim 8, characterized in that: The distance between the upper side of the extension plate (1433) and the bottom surface of the heat preservation box (13) is greater than or equal to 20 mm; The spacing between the lower side of the extension plate (1433) and the connecting bottom plate (142a) is greater than or equal to 20 mm.

10. The device for testing the dynamic and static stiffness and fatigue resistance of the pad according to claim 9, characterized in that: The temperature control component (17) includes: a cooling source, a heating source, a temperature controller (171) connected to the cooling source and the heating source, and a temperature sensor; The refrigeration source is liquid nitrogen; The heat source is hot air from an oven; The temperature controller (171) is installed outside the thermal insulation box (13); The temperature sensor is arranged in the thermal insulation box (13); The heat preservation box (13) is provided with a cold source connecting pipe (131) for connecting to the refrigeration source and a heat source connecting pipe (132) for connecting to the heating source.

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