Railway wagon joint connector strength test loading device and test method thereof

Abstract

The application discloses a railway wagon joint connector strength test loading device and a test method thereof. The device is provided with a corresponding base, a lower support, a connecting slot, a side support and a top base to realize the connection and fixation of the two ends of the joint connector to be tested and the pin shaft structure part, thereby realizing force transmission. In cooperation with corresponding longitudinal loading devices, a center disc longitudinal loading device, a vertical loading device, a vertical angle loading device and a horizontal angle loading device, the strength test of different parts can be realized, and the combination and integration of the above tests can also be realized. Compared with the prior art, the application has the advantages of simple structure, convenient installation and removal, and can efficiently complete various strength tests and combined strength test simulation examination of the joint connector.

Description

Technical Field

[0001] This invention belongs to the field of joint connector strength testing, specifically relating to a loading device and testing method for testing the strength of railway freight car joint connectors. Background Technology

[0002] With the development of multimodal transport technology in my country, various railway vehicles and train formations adapted to multimodal transport have emerged. Among them, the use of articulated connectors to connect multiple vehicles into a single trainset for freight transport is a representative example. The use of articulated connectors reduces the number of bogies, buffers, braking devices, etc., and lowers the overall weight of the train, thus demonstrating high practical value.

[0003] CN201402215Y discloses a fatigue performance testing device for railway freight car joint connectors. However, its purpose, means, and method are to conduct corresponding tests on the fatigue performance of joint connectors. Moreover, its structure is relatively fixed and cannot effectively simulate various combinations of situations or conduct loading tests on the strength of joint connectors.

[0004] In summary, it is necessary to design the corresponding structural combination and test method for the strength test of joint connectors. The structure needs to be flexible and adaptable to different needs for quick disassembly, installation and assembly, so as to maximize the efficiency and effective reference value of the test. Summary of the Invention

[0005] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects and advantages of the present application more readily apparent.

[0006] This invention provides a loading device and testing method for strength testing of railway freight car joint connectors. The device has a simple structure, is easy to install and remove, and can efficiently complete various strength tests and combined strength tests of joint connectors.

[0007] This invention discloses a loading device for strength testing of railway freight car joint connectors, comprising:

[0008] Base;

[0009] The lower support is mounted on the base by longitudinal horizontal displacement via the longitudinal loading device of the core plate, and the lower support is provided with a connecting slot for fitting and forming a snap-fit ​​with the pin connection structure in the joint connector under test; the loading end of the longitudinal loading device of the core plate abuts or separates from the lower support by longitudinal horizontal displacement.

[0010] Two side supports are symmetrically arranged on both sides of the lower support. Their inner ends are used to fix and connect to the two ends of the joint connector to be tested, and their outer ends are disposed on the base by a longitudinal loading device that can be longitudinally and horizontally displaced. A detachable shaft connector is provided between the loading end of the longitudinal loading device and the side supports.

[0011] A top seat is provided above the side support, and a vertical loading device is provided between each side support and the top seat; the loading end of the vertical loading device abuts or separates from its corresponding side support or top seat through vertical displacement.

[0012] A lateral corner loading device is provided on one side of one of the side supports, and its loading end abuts or separates from the side support through lateral horizontal displacement;

[0013] Two clamping support seats are provided on both sides of the other side support seat, and a detachable support clamping beam is provided between each clamping support seat and the side support seat;

[0014] A vertical rotation loading device is provided at the outer end of any of the side supports, and its loading end is connected to the side support through a detachable tilting structure rotation force beam.

[0015] In some embodiments, the base is provided with a limiting edge; the lower end of the lower support is engaged in the limiting edge to limit the longitudinal horizontal displacement direction of the lower support.

[0016] In some embodiments, the inner end of the side support has a groove structure and is used to form a snap-fit ​​with both ends of the joint connector to be tested.

[0017] In some implementations, it also includes:

[0018] A guide support is provided on the base; the upper end face of the guide support abuts against the side support; a guide hole is provided in the guide support; the top rod of the longitudinal loading device of the center plate passes through the guide hole.

[0019] In some embodiments, the vertical loading device is mounted on the top seat, and the loading end of the vertical loading device abuts or separates from its corresponding side support through vertical displacement.

[0020] In some implementations, it also includes:

[0021] Optical axes are located on both sides of the base;

[0022] Two sliding mounts are slidably mounted on the optical axis; each sliding mount is connected to its corresponding axis connector.

[0023] In some embodiments, a connecting reinforcing plate is provided between the top seat and the base; the connecting reinforcing plate is arranged in a triangular structure.

[0024] In some embodiments, the loading end of the vertical angle loading device is positioned below the horizontal height of the side support, and the angle force beam is equipped with angle rollers.

[0025] In some implementations, it also includes:

[0026] The longitudinal load sensing unit is used to detect the compressive and tensile loads at both ends of the joint connector under test.

[0027] The longitudinal load sensing unit for the core plate is used to detect the longitudinal load of the core plate at the pin connection structure in the joint connector under test.

[0028] Vertical load sensing unit, used to detect the vertical load on both ends of the joint connector under test;

[0029] Lateral rotation load sensing unit is used to detect the lateral rotation deflection load at one end of the joint connector under test.

[0030] Vertical rotation load sensing unit is used to detect the vertical rotation deflection load at one end of the joint connector under test.

[0031] Tilt sensor is used to detect the tilt angle of the joint connector under test during lateral and vertical rotation load bearing processes.

[0032] A method for testing the strength of railway freight car joint connectors, comprising a loading device for testing the strength of railway freight car joint connectors as described in any of the above embodiments, wherein the testing method includes:

[0033] Connect and fix both ends of the joint connector to be tested to the side support respectively, and install the pin connection structure of the joint connector to be tested into the connection slot of the lower support.

[0034] In the longitudinal load test, the support clamping beam and the corner force beam are removed. The longitudinal loading device, vertical loading device and transverse corner loading device of the center plate do not obstruct the compressive load and tensile load applied by the longitudinal loading device to the side support.

[0035] For the longitudinal load test of the center plate, the support clamping beam, the rotation force beam, and the shaft connector located on the same side of the longitudinal loading device of the center plate are removed. The longitudinal loading device, the vertical loading device, and the transverse rotation force loading device do not hinder the longitudinal bearing load of the center plate applied to the lower support by the longitudinal loading device of the center plate.

[0036] In the vertical load test, the support clamping beam, the corner force beam, and the shaft connector are removed. The longitudinal loading device and the transverse corner loading device of the center plate do not obstruct the vertical load applied to the side support by the vertical loading device.

[0037] In the lateral rotation angle load test, the shaft connector and rotation angle force beam are removed, and the vertical loading device and the longitudinal loading device of the center plate do not obstruct the lateral rotation angle deflection load applied by the lateral rotation angle loading device to the side support.

[0038] In the vertical rotation angle load test, the support clamping beam and the shaft connector located on the same side of the vertical rotation angle loading device are removed. The longitudinal loading device, vertical loading device, center plate longitudinal loading device, and transverse rotation angle loading device do not obstruct the vertical rotation angle deflection load applied by the vertical rotation angle loading device to the side support.

[0039] Multi-directional load combination tests, further including:

[0040] In the combined longitudinal and vertical load test, the support clamping beam and the corner force beam are removed, and the longitudinal loading device and the transverse corner loading device of the center plate do not obstruct the combined force applied by the longitudinal loading device and the vertical loading device to the side support.

[0041] In the combined longitudinal and vertical load test of the mandrel, the support clamping beam, shaft connector, and corner force beam were removed, and the transverse corner loading device did not obstruct the combined force applied to the side support by the longitudinal and vertical loading devices of the mandrel.

[0042] In the combined test of longitudinal load, center plate longitudinal load, and vertical load, the support clamping beam and the corner force beam are removed, and the transverse corner loading device does not obstruct the combined force applied to the side support by the longitudinal loading device, the center plate longitudinal loading device, and the vertical loading device.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0044] 1. This device, based on the actual working conditions simulated, sets up a total of 5 loading test methods and 3 combined loading test methods for the strength loading simulation experiment of joint connectors. By reasonably setting them according to the structural position and layout, separate tests can be carried out to meet the requirements of joint connector strength inspection (single direction, single load, multi-direction, multi-load simultaneous action). Since there is currently no targeted inspection scheme for joint connector strength inspection in China.

[0045] 2. The device has a simple overall structure, reasonable design, and convenient and reliable force transmission method. It is easy to disassemble, install and set up according to the actual simulated loading conditions. It has the advantage of small footprint and greatly improves the utilization rate of the test device and reduces the test cost.

[0046] 3. Each loading scheme is independent and does not interfere with the others, which improves the safety and reliability of each test condition. Its loading method and device are widely applicable, requiring only a loading rail foundation and anchor bolts. Attached Figure Description

[0047] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0048] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0049] Figure 2 This is a schematic diagram showing the distribution structure of the core plate loading seat, clamping support seat, and transverse corner loading seat of the present invention.

[0050] Figure 3 This is a schematic diagram of the connection structure between the base, lower support, side support and top support of the present invention.

[0051] Figure 4 This is a half-sectional view of the present invention.

[0052] Figure 5 This is a three-dimensional structural diagram of the vertical corner loading device and the horizontal corner loading device of the present invention.

[0053] Figure 6 This is a top view of the present invention.

[0054] Figure descriptions: 1. Base; 2. Lower support; 3. Connecting slot; 4. Side support; 5. Top support; 6. Shaft connector; 7. Sliding seat; 8. Optical axis; 9. Vertical loading device; 10. Core plate loading seat; 11. Clamping support seat; 12. Lateral corner loading seat; 13. Core plate longitudinal loading device; 14. Guide support seat; 15. Vertical corner loading seat; 16. Vertical corner loading device; 17. Cornering force beam; 18. Cornering roller; 19. Connecting reinforcing plate; 20. Support clamping beam; 21. Lateral corner loading device. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments provided by this invention without inventive effort are within the scope of protection of this invention.

[0056] Obviously, the accompanying drawings described below are merely some examples or embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this invention, modifications to design, manufacturing, or production based on the technical content disclosed in this invention are merely conventional technical means and should not be construed as insufficient disclosure of the present invention.

[0057] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention may be combined with other embodiments without conflict.

[0058] A loading device for strength testing of railway freight car joint connectors includes:

[0059] The base 1 serves as the basic platform for the installation of the overall experimental device. Optical axes 8 are symmetrically arranged on both sides of the base 1, and two sliding seats 7 are slidably installed on the optical axes 8.

[0060] The lower support 2 is mounted on the base 1, allowing for longitudinal horizontal displacement via the longitudinal loading device 13. The lower support 2 has a connecting slot 3 for fitting and engaging with the pin connection structure of the joint connector under test. The loading end of the longitudinal loading device 13 abuts or separates from the lower support 2 through longitudinal horizontal displacement. Specifically, guide supports 14 are symmetrically arranged on both sides of the lower support 2, fixedly mounted on the base 1. Guide holes are provided within the guide supports 14, through which the top rod of the longitudinal loading device 13 passes to provide a driving and guiding function. Simultaneously, a limiting edge is provided on the base 1; the lower end of the lower support 2 is engaged within the limiting edge to restrict the longitudinal horizontal displacement direction of the lower support 2, ensuring the stability and reliability of the force direction during loading at the pin connection structure of the joint connector under test.

[0061] Two side supports 4 are symmetrically arranged on both sides of the lower support 2. Their inner ends are used to fix and connect with the two ends of the joint connector under test. Specifically, the inner end of the side support 4 has a groove structure and is used to form a snap-fit ​​with the two ends of the joint connector under test. Its outer end is disposed on the base 1 by longitudinal horizontal displacement through the longitudinal loading device. Specifically, the two side supports 4 are respectively placed on their corresponding guide support seats 14. A detachable shaft connector 6 is provided between the loading end of the longitudinal loading device and the side support 4. Specifically, the longitudinal loading device applies force to the sliding seat 7 and transmits it to the side support 4 through the shaft connector 6, and finally to the joint connector under test. During compression and tension, the optical axis 8 plays a good guiding role.

[0062] A top seat 5 is located above the side support 4, and a vertical loading device 9 is provided between each side support 4 and the top seat 5; the loading end of the vertical loading device 9 abuts or separates from its corresponding side support 4 or the top seat 5 through vertical displacement; specifically, as shown in the figure, the vertical loading device 9 is located on the top seat 5, and the loading end of the vertical loading device 9 abuts or separates from its corresponding side support 4 through vertical displacement.

[0063] A lateral corner loading device 21 is provided on one side of one of the side supports 4, and its loading end abuts or separates from the side support 4 through lateral horizontal displacement.

[0064] Two clamping support seats 11 are provided on both sides of the other side support 4, and a detachable support clamping beam 20 is provided between each clamping support seat 11 and the side support 4.

[0065] A vertical angle loading device 16 is disposed at the outer end of any of the side supports 4, and its loading end is connected to the side support 4 through a detachable inclined angle force beam 17. The horizontal height of the loading end of the vertical angle loading device 16 is below the horizontal height of the side support 4, and the angle force beam 17 is provided with an angle roller 18.

[0066] A connecting reinforcing plate 19 is disposed between the top seat 5 and the base 1; the connecting reinforcing plate 19 is arranged in a triangular structure.

[0067] In some embodiments, it also includes:

[0068] The longitudinal load sensing unit is used to detect the compressive and tensile loads at both ends of the joint connector under test.

[0069] The longitudinal load sensing unit for the core plate is used to detect the longitudinal load of the core plate at the pin connection structure in the joint connector under test.

[0070] Vertical load sensing unit, used to detect the vertical load on both ends of the joint connector under test;

[0071] Lateral rotation load sensing unit is used to detect the lateral rotation deflection load at one end of the joint connector under test.

[0072] Vertical rotation load sensing unit is used to detect the vertical rotation deflection load at one end of the joint connector under test.

[0073] Tilt sensor is used to detect the tilt angle of the joint connector under test during lateral and vertical rotation load bearing processes.

[0074] The specific installation location of the aforementioned sensing units and sensors is not limited, as long as they meet the specific detection functions that can be achieved. The specific function of the aforementioned sensing units and sensors is to collect and feedback the detection data and present it on the display end, so that the operator can easily identify whether it meets the set requirements.

[0075] A method for testing the strength of railway freight car joint connectors, comprising a loading device for testing the strength of railway freight car joint connectors as described in any of the above embodiments, wherein the testing method includes:

[0076] First, connect and fix both ends of the joint connector to be tested to the side support 4 respectively. Then, install the pin connection structure of the joint connector to be tested into the connection slot 3 of the lower support 2 to complete the initial installation and fixation of the device.

[0077] Depending on the requirements, the following five types of unidirectional force loading tests and three combinations of force loading tests can be performed, including: longitudinal load test, center plate longitudinal load test, vertical load test, lateral rotation force load test, vertical rotation force load test, longitudinal and vertical load combination test, center plate longitudinal and vertical load combination test, and longitudinal load, center plate longitudinal load, and vertical load combination test.

[0078] 1. Longitudinal load test: The support clamping beam 20 and the corner force beam 17 are removed. The longitudinal loading device 13, vertical loading device 9, and transverse corner loading device 21 do not obstruct the compressive and tensile loads applied by the longitudinal loading device to the side support 4. The longitudinal loading device applies the corresponding loads to the sliding seats 7 at both ends, which are transmitted to both ends of the joint connector under test through the shaft connector 6 and the side support 4. During the above process, since the transmission ends of other loading devices are removed or in a retracted state, no mechanical obstruction will occur, ensuring that they can provide the corresponding space.

[0079] 2. For the longitudinal load test of the mandrel, the supporting clamping beam 20, the angular force beam 17, and the shaft connector 6 located on the same side as the longitudinal loading device 13 of the mandrel are removed. The longitudinal loading device, the vertical loading device 9, and the lateral angular loading device 21 do not obstruct the longitudinal bearing load of the mandrel applied by the longitudinal loading device 13 to the lower support 2. The shaft connector 6 on the other side of the longitudinal loading device 13 of the mandrel is not removed and can play the role of force support. The longitudinal loading device 13 of the mandrel applies the corresponding load, which is transmitted to the pin connection structure of the joint connector under test through the lower support 2.

[0080] 3. Vertical load test: Remove the support clamping beam 20, the rotation angle force beam 17, and the shaft connector 6. The longitudinal loading device 13 and the transverse rotation angle loading device 21 of the center plate do not obstruct the vertical load applied by the vertical loading device 9 to the side support 4. The two vertical loading devices 9 apply the corresponding loads to their respective side supports 4 and transmit them to both ends of the corresponding joint connector under test.

[0081] 4. Lateral rotation angle load test: Remove shaft connector 6 and rotation angle force beam 17. Vertical loading device 9 and longitudinal loading device 13 of the center plate do not obstruct the lateral rotation angle load applied by the lateral rotation angle loading device 21 to the side support 4. The lateral rotation angle loading device 21 applies the corresponding load to its corresponding side support 4 and transmits it to one end of the joint connector under test through the side support 4.

[0082] 5. Vertical rotational force load test: The support clamping beam 20 and the shaft connector 6 located on the same side as the vertical rotational loading device 16 are removed. The longitudinal loading device, vertical loading device 9, longitudinal loading device 13 of the center plate, and transverse rotational loading device 21 do not obstruct the vertical rotational deflection load applied to the side support 4 of the vertical rotational loading device 16. In the above process, the rotational force beam 17 is set as an inclined structure because an inclined force will be generated during the application of the load, thereby simulating the loading of vertical rotational force.

[0083] 6. For the combined longitudinal and vertical load test, the support clamping beam 20 and the corner force beam 17 are removed. The longitudinal loading device 13 and the transverse corner loading device 21 of the center plate do not obstruct the combined force applied by the longitudinal loading device and the vertical loading device 9 to the side support 4.

[0084] 7. Combined test of longitudinal and vertical loads on the center plate: Remove the support clamping beam 20, shaft connector 6, and corner force beam 17. The transverse corner loading device 21 does not obstruct the combined force applied to the side support 4 by the longitudinal loading device 13 and the vertical loading device 9 on the center plate.

[0085] 8. Combined test of longitudinal load, center plate longitudinal load, and vertical load: Remove the support clamping beam 20 and the corner force beam 17. The transverse corner loading device 21 does not obstruct the combined force applied to the side support 4 by the longitudinal loading device, the center plate longitudinal loading device 13, and the vertical loading device 9.

[0086] During the above tests, the various connection structures can be quickly disassembled and installed using bolts. At the same time, the force contact points are mostly of abutment-type structural form, that is, they are connected when a load needs to be applied to ensure the transmission of force, and separated when no load needs to be applied to avoid mutual obstruction.

[0087] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A loading device for strength testing of railway freight car joint connectors, characterized in that, include: Base; The lower support is mounted on the base by longitudinal horizontal displacement via the longitudinal loading device of the core plate, and the lower support is provided with a connecting slot for fitting and forming a snap-fit ​​with the pin connection structure in the joint connector under test; the loading end of the longitudinal loading device of the core plate abuts or separates from the lower support by longitudinal horizontal displacement. Two side supports are symmetrically arranged on both sides of the lower support. Their inner ends are used to fix and connect to the two ends of the joint connector to be tested, and their outer ends are disposed on the base by a longitudinal loading device that can be longitudinally and horizontally displaced. A detachable shaft connector is provided between the loading end of the longitudinal loading device and the side supports. A top seat is provided above the side support, and a vertical loading device is provided between each side support and the top seat; the loading end of the vertical loading device abuts or separates from its corresponding side support or top seat through vertical displacement. A lateral corner loading device is provided on one side of one of the side supports, and its loading end abuts or separates from the side support through lateral horizontal displacement; Two clamping support seats are provided on both sides of the other side support seat, and a detachable support clamping beam is provided between each clamping support seat and the side support seat; A vertical angle loading device is provided at the outer end of any of the side supports, and its loading end is connected to the side support through a detachable inclined angle force beam. The railway freight car joint connector strength test loading device can perform multi-directional load combination tests, and the multi-directional load combination test further includes: In the combined longitudinal and vertical load test, the support clamping beam and the corner force beam are removed, and the longitudinal loading device and the transverse corner loading device of the center plate do not obstruct the combined force applied by the longitudinal loading device and the vertical loading device to the side support. In the combined longitudinal and vertical load test of the mandrel, the support clamping beam, shaft connector, and corner force beam were removed, and the transverse corner loading device did not obstruct the combined force applied to the side support by the longitudinal and vertical loading devices of the mandrel. In the combined test of longitudinal load, center plate longitudinal load, and vertical load, the support clamping beam and the corner force beam are removed, and the transverse corner loading device does not obstruct the combined force applied to the side support by the longitudinal loading device, the center plate longitudinal loading device, and the vertical loading device.

2. The loading device for strength testing of railway freight car joint connectors according to claim 1, characterized in that, The base is provided with a limiting edge; the lower end of the lower support is engaged in the limiting edge to restrict the longitudinal horizontal displacement direction of the lower support.

3. The loading device for strength testing of railway freight car joint connectors according to claim 1, characterized in that, The inner end of the side support has a groove structure and is used to form a snap-fit ​​with both ends of the joint connector to be tested.

4. The loading device for strength testing of railway freight car joint connectors according to claim 1, characterized in that, Also includes: A guide support is provided on the base; the upper end face of the guide support abuts against the side support; a guide hole is provided in the guide support; the top rod of the longitudinal loading device of the center plate passes through the guide hole.

5. The loading device for strength testing of railway freight car joint connectors according to claim 1, characterized in that, The vertical loading device is mounted on the top seat, and the loading end of the vertical loading device abuts or separates from its corresponding side support through vertical displacement.

6. The loading device for strength testing of railway freight car joint connectors according to claim 1, characterized in that, Also includes: Optical axes are located on both sides of the base; Two sliding mounts are slidably mounted on the optical axis; Each of the sliding seats is connected to its corresponding shaft connector.

7. The loading device for strength testing of railway freight car joint connectors according to claim 1, characterized in that, A connecting reinforcing plate is provided between the top seat and the base; the connecting reinforcing plate is arranged in a triangular structure.

8. The loading device for strength testing of railway freight car joint connectors according to claim 1, characterized in that, The loading end of the vertical angle loading device is located below the horizontal height of the side support, and the angle force beam is equipped with an angle roller.

9. The loading device for strength testing of railway freight car joint connectors according to claim 1, characterized in that, Also includes: The longitudinal load sensing unit is used to detect the compressive and tensile loads at both ends of the joint connector under test. The longitudinal load sensing unit for the core plate is used to detect the longitudinal load of the core plate at the pin connection structure in the joint connector under test. Vertical load sensing unit, used to detect the vertical load on both ends of the joint connector under test; Lateral rotation load sensing unit is used to detect the lateral rotation deflection load at one end of the joint connector under test. Vertical rotation load sensing unit is used to detect the vertical rotation deflection load at one end of the joint connector under test. Tilt sensor is used to detect the tilt angle of the joint connector under test during lateral and vertical rotation load bearing processes.

10. A method for testing the strength of a railway freight car joint connector, characterized in that, The railway freight car joint connector strength testing loading device, as described in any one of claims 1-9, includes the following testing method: Connect and fix both ends of the joint connector to be tested to the side support respectively, and install the pin connection structure of the joint connector to be tested into the connection slot of the lower support. In the longitudinal load test, the support clamping beam and the corner force beam are removed. The longitudinal loading device, vertical loading device and transverse corner loading device of the center plate do not obstruct the compressive load and tensile load applied by the longitudinal loading device to the side support. For the longitudinal load test of the center plate, the support clamping beam, the rotation force beam, and the shaft connector located on the same side of the longitudinal loading device of the center plate are removed. The longitudinal loading device, the vertical loading device, and the transverse rotation force loading device do not hinder the longitudinal bearing load of the center plate applied to the lower support by the longitudinal loading device of the center plate. In the vertical load test, the support clamping beam, the corner force beam, and the shaft connector are removed. The longitudinal loading device and the transverse corner loading device of the center plate do not obstruct the vertical load applied to the side support by the vertical loading device. In the lateral rotation angle load test, the shaft connector and rotation angle force beam are removed, and the vertical loading device and the longitudinal loading device of the center plate do not obstruct the lateral rotation angle deflection load applied by the lateral rotation angle loading device to the side support. In the vertical rotational force load test, the supporting clamping beam and the shaft connector located on the same side as the vertical rotational loading device are removed. The longitudinal loading device, vertical loading device, center plate longitudinal loading device, and transverse rotational loading device do not obstruct the vertical rotational deflection load applied by the vertical rotational loading device to the side support.

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