A hinge static strength test clamping device and system

Abstract

The application provides a hinge static strength test clamping device and system, the hinge static strength test clamping device comprises: a clamp arranged in the load working condition direction of a test piece, the clamp is used for transmitting the vertical downward load of a test machine, one end of the loading end clamp is connected with the loading end of the test piece, and the other end is connected with the test machine, a base support is provided with a first fixed point and a second fixed point, the first fixed point is close to the loading end, the second fixed point is away from the loading end, and the non-loading end of the test piece is fixed through the first fixed point and the second fixed point, and a clamping plate is arranged at the second fixed point and used for fixing the base support and the non-loading end of the test piece, the application is used for verifying the hinge bearing capacity test and the static strength analysis method, and can ensure that the test piece reasonably transmits the load and prevent the displacement error of the connecting part from interfering with the analysis method.

Description

[Technical Field]

[0001] This invention relates to the field of iron and steel metallurgy technology, and in particular to a clamping device and system for testing the static strength of hinges. [Background Technology]

[0002] Hinges are a typical component in aircraft design, generally consisting of a lug, a gooseneck web, and a base. Loads are transferred from the lug to the base via the gooseneck web, and then to the fuselage through the base's fasteners. Hinges are commonly used to connect aircraft doors, canopies, and other structural elements.

[0003] Traditional hinges are machined or cast from sheet metal. Due to the limitations of the manufacturing process, the material and configuration of the hinge are not entirely in the direction of force application, resulting in a relatively heavy weight. With the development of new aerospace technologies and materials, there are more and more ways to form hinges. Additive manufacturing, with its unconstrained and free manufacturing characteristics, has been favored by aerospace structural designers, making it possible to arrange materials and structures according to loads, thus greatly reducing the weight of parts.

[0004] Additive manufacturing is a manufacturing method that integrates new materials, new processes, and new structures. To verify its load-bearing capacity and analytical methods, in addition to material and process-level testing and part-level simulation analysis, part-level testing is also required. Traditional hinge static strength testing involves fixing the hinge base to a fixture via a mechanical connection and then applying a load to the lugs using a universal testing machine. Due to the load-bearing characteristics of the hinge, the fasteners on the base plate far from the lugs will experience significant tensile forces. These tensile forces affect the load-displacement relationship, which will severely interfere with the analysis and judgment of a new material, new process, or new structure.

[0005] Therefore, it is necessary to study a hinge static strength test clamping device and system to address the shortcomings of the existing technology and solve or mitigate one or more of the above-mentioned problems. [Summary of the Invention]

[0006] In view of this, the present invention provides a hinge static strength test clamping device and system for testing the hinge load-bearing capacity and verifying the static strength analysis method, and can ensure reasonable load transmission of the test piece and prevent the analysis method from being interfered with by displacement errors of the connection parts.

[0007] On one hand, the present invention provides a hinge static strength test clamping device, the hinge static strength test clamping device comprising:

[0008] The clamp is set in the load condition direction of the test piece. The clamp is used to transfer the vertically downward load of the testing machine. One end of the loading end clamp is connected to the loading end of the test piece, and the other end is connected to the testing machine.

[0009] The base supports the test piece and has a first fixed point and a second fixed point. The first fixed point is close to the loading end and the second fixed point is far away from the loading end. The non-loading end of the test piece is fixed together by the first fixed point and the second fixed point.

[0010] The clamp, located at the second fixing point, is used to fix the base support and the unloaded end of the test piece.

[0011] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the fixture includes a force-bearing part, a connecting part, and a loading part. One end of the force-bearing part is connected to the testing machine, and the other end is connected to the connecting part. The upper end of the loading part is connected to the connecting part, and the lower end is provided with a U-shaped groove. The loading end of the test piece is disposed in the U-shaped groove.

[0012] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the force-bearing part includes a double-ear mechanism and a force transmission rod, the force transmission rod is disposed in two through holes of the double-ear mechanism, the force transmission rod is connected to the testing machine, the connecting part is a connecting platform, and the double-ear mechanism is disposed on the connecting platform.

[0013] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the loading part includes a first loading unit and a second loading unit, the first loading unit and the second loading unit are arranged in parallel, the first loading unit and / or the second loading unit are perpendicular to the double-ear mechanism in the horizontal direction, the upper ends of the first loading unit and the second loading unit are fixedly connected to the connecting platform, and the lower ends are provided with U-shaped grooves.

[0014] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the base support includes a first connecting part, a second connecting part, a first fixing part, and a second fixing part. The first fixing part and the second fixing part are arranged in parallel. The first fixing part is located on the side closer to the loading end of the test piece, and the second fixing part is located on the side farther from the loading end of the test piece. The first connecting part is connected to the test piece, and the second connecting part is connected to the testing machine. The first connecting part, the first fixing part, the second connecting part, and the second fixing part are sequentially connected to form a closed loop structure.

[0015] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the second connecting part is provided with a connecting groove, the testing machine is fixedly connected to the connecting groove by bolts, and the groove opening direction of the connecting groove is perpendicular to the first fixing part.

[0016] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the first fixing point and the second fixing point are both disposed on the first connecting part. The first fixing point is provided with two circular opening structures, and the unloaded end of the test piece is fixedly connected to the two circular opening structures by bolts. The second fixing point is provided with two slot structures, and the unloaded end of the test piece is fixedly connected to the two slot structures by bolts. The straight line of the two circular opening structures is parallel to the first fixing part, and the slotting direction of the two slot structures is perpendicular to the first fixing part.

[0017] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the first connecting part is further provided with a third fixing point, the third fixing point being disposed between the first fixing point and the second fixing point, and the third fixing point being provided with two square grooves, the two square grooves being connected to the test piece.

[0018] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the clamping plate is provided with two clamping plate through holes, and the test piece passes through the two clamping plate through holes and is disposed in two slot structures.

[0019] In accordance with the aspects described above and any possible implementation, a hinge static strength testing system is further provided, the hinge static strength testing system further comprising a testing machine and a test piece, the testing machine acting on the test piece through a hinge static strength testing clamping device, the test piece having a base support and a clamp respectively connected to both ends.

[0020] Compared with the prior art, the present invention can achieve the following technical effects:

[0021] 1. By using the loading end clamps to ensure that the load is vertically downward, the load direction of the testing machine is consistent with the load condition direction of the test piece, resulting in more direct load transfer;

[0022] 2. A high-rigidity base is used for support, and the orientation of the test specimen is adjusted. Since the lower crossbeam of the testing machine is perpendicular to the output load of the testing machine, while the load direction of the test specimen is often not perpendicular to the base of the test specimen, the base support can be designed according to the angle between the load direction of the test specimen and the base of the test specimen, thereby ensuring that the test condition of the test specimen is consistent with the load condition and reducing test errors;

[0023] 3. Use clamps to prevent bolt deformation under tensile force from affecting test results. After the test piece is loaded, the connecting bolts far from the loading point will be subjected to increased tensile force. Therefore, designing a clamp can reduce or eliminate this effect.

[0024] 4. The entire set of experimental fixtures is small in number, simple to assemble, and can minimize errors, which is conducive to the rapid design and verification of additive manufacturing parts that integrate new materials, new processes, and new structures.

[0025] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time. [Attached Image Description]

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a front view of the test specimen and test apparatus provided in one embodiment of the present invention;

[0028] Figure 2 This is an isometric drawing of a fixture provided in one embodiment of the present invention;

[0029] Figure 3 This is an isometric view of the base support provided in one embodiment of the present invention;

[0030] Figure 4 This is an isometric drawing of a clamping plate provided in one embodiment of the present invention.

[0031] In the figure:

[0032] 1-Clamp; 11-Force-bearing part; 12-Connecting part; 13-Loading part; 2-Base support; 21-First connecting part; 22-Second connecting part; 23-First fixing part; 24-Second fixing part; 25-First fixing point; 26-Second fixing point; 27-Third fixing point; 3-Clamping plate; 31-Clamping plate perforation; 4-Test piece; 5-Testing machine.

Detailed Implementation Methods

[0033] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0036] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0039] like Figure 1 As shown, the present invention provides a hinge static strength test clamping device, the hinge static strength test clamping device comprising:

[0040] The clamp 1 is set in the load condition direction of the test piece 4. The loading end clamp 1 is used to transfer the vertically downward load of the testing machine 5. One end of the loading end clamp 1 is connected to the loading end of the test piece 4, and the other end is connected to the testing machine 5.

[0041] The base support 2 is provided with a first fixing point 25 and a second fixing point 26. The first fixing point 25 is close to the loading end, and the second fixing point 26 is far away from the loading end. The non-loading end of the test piece 4 is fixed together by the first fixing point 25 and the second fixing point 26.

[0042] Clamping plate 3 is set at the second fixing point 26 to fix the base support 2 and the unloaded end of the test piece 4.

[0043] The fixture 1 includes a force-bearing part 11, a connecting part 12, and a loading part 13. One end of the force-bearing part 11 is connected to the testing machine 5, and the other end is connected to the connecting part 12. The upper end of the loading part 13 is connected to the connecting part 12, and the lower end is provided with a U-shaped groove. The loading end of the test piece 4 is set in the U-shaped groove.

[0044] like Figure 2 As shown, the force-receiving part 11 includes a double-ear mechanism and a force-transmitting rod. The force-transmitting rod is disposed in two through holes of the double-ear mechanism and is connected to the testing machine 5. The connecting part 12 is a connecting platform, and the double-ear mechanism is disposed on the connecting platform. The loading part 13 includes a first loading unit and a second loading unit. The first loading unit and the second loading unit are arranged in parallel. The first loading unit and / or the second loading unit are perpendicular to the double-ear mechanism in the horizontal direction. The upper ends of the first loading unit and the second loading unit are fixedly connected to the connecting platform, and the lower ends are provided with U-shaped grooves.

[0045] like Figure 3 As shown, the base support 2 includes a first connecting part 21, a second connecting part 22, a first fixing part 23, and a second fixing part 24. The first fixing part 23 and the second fixing part 24 are arranged in parallel. The first fixing part 23 is located on the side closer to the loading end of the test piece 4, and the second fixing part 24 is located on the side away from the loading end of the test piece 4. The first connecting part 21 is connected to the test piece 4, and the second connecting part 22 is connected to the testing machine 5. The first connecting part 21, the first fixing part 23, the second connecting part 22, and the second fixing part 24 are sequentially connected to form a closed ring structure.

[0046] The first fixing point 25 and the second fixing point 26 are both set on the first connecting part 21. The first fixing point 25 is provided with two circular opening structures. The unloaded end of the test piece 4 is fixedly connected to the two circular opening structures by bolts. The second fixing point 26 is provided with two slot structures. The unloaded end of the test piece 4 is fixedly connected to the two slot structures by bolts. The straight line of the two circular opening structures is parallel to the first fixing part 23. The slotting direction of the two slot structures is perpendicular to the first fixing part 23.

[0047] The first connecting part 21 is also provided with a third fixing point 27, which is located between the first fixing point 25 and the second fixing point 26. The third fixing point 27 is provided with two square grooves, which are connected to the test piece 4.

[0048] The second connecting part 22 is provided with a connecting groove, and the testing machine 4 is fixedly connected to the connecting groove by bolts. The groove opening direction of the connecting groove is perpendicular to the first fixing part 23.

[0049] The clamping plate 3 is provided with two clamping plate through holes 31, and the test piece 4 is placed in the two slot structures through the two clamping plate through holes 31.

[0050] The present invention also provides a hinge static strength testing system, which further includes a testing machine 5 and a test piece 4. The testing machine 5 acts on the test piece 4 through a hinge static strength testing clamping device. The test piece 4 is connected to a base support 2 and a clamp 1 at both ends.

[0051] Example 1:

[0052] This invention is used for testing the load-bearing capacity of hinges and verifying static strength analysis methods. It ensures reasonable load transfer on the test piece and prevents interference with the analysis method due to displacement errors at the connection points. The invention comprises a loading end clamp 1, a base support 2, and a clamping plate 3, with each component mechanically connected to form an assembly relationship. The loading end clamp 1 applies load through a force transmission rod via a connection hole in the test piece 4. The clamp 1 is designed to apply a downward force to the force transmission rod. The upper end of the loading end clamp 1 is connected to a loading testing machine 5, and the lower end is designed with a U-shaped groove to load the screw.

[0053] The base support 2 has sufficient rigidity, with a thickness of 25mm on its upper and lower connecting surfaces and 35mm on its left and right supporting ends. To position the specimen relative to the fixed-end base support 2, a pair of holes are drilled on the fixed-end base support 2 to connect with the test piece 4, while the remaining connecting holes are connected to the specimen via bolts in the form of slots. The bottom of the fixed-end base support 2 is connected to the bottom groove of the testing machine 5 via bolts. The test piece 4 is fixed to the testing table by the high-rigidity base support 2. To release degrees of freedom and reduce fitting assembly, the tension bolts are connected to the test piece 4 via slots.

[0054] The clamping plate 3 is mainly designed to prevent the bolts from deforming under tensile force, which would affect the test results. Since the connecting bolts far from the loading point will experience increased tensile force after the test piece 4 is loaded, a clamping plate 3 is designed to weaken or eliminate this effect. The width of the clamping plate 3 is not less than 2.5 times the bolt diameter, the thickness of the clamping plate 3 is not less than 1.5 times the bolt diameter, the length of the clamping plate 3 is not less than 7 times the bolt diameter, and the bolt spacing is not less than 4 times the bolt diameter and not more than 5.5 times the bolt diameter.

[0055] The present invention greatly simplifies the number of tooling components and cleverly decomposes the load transfer and the fixing of the test piece 4, which is beneficial to reducing test errors.

[0056] The foregoing has provided a detailed description of a hinge static strength testing clamping device and system according to embodiments of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application; furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

[0057] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising / including but not limited to". "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of illustrating the general principles of this application and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0058] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0059] It should be understood that the term "and / or" used in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent:

[0060] There are three possibilities: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally indicates an "OR" relationship between the preceding and following objects.

[0061] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A hinge static strength test clamping device for performing a static strength test on a hinge test piece, characterized by, The hinge static strength test clamping device comprises: A clamp is arranged in the load working condition direction of the test piece, and the clamp is used to transmit the vertical downward load of the testing machine, the clamp comprises a force receiving part, a connecting part and a loading part, one end of the force receiving part is connected to the testing machine, the other end is connected to the connecting part, the upper end of the loading part is connected to the connecting part, and the lower end is provided with a U-shaped groove, the loading end of the test piece is arranged in the U-shaped groove, one end of the loading end clamp is connected to the loading end of the test piece, and the other end is connected to the testing machine; A base support is provided with a first fixed point and a second fixed point, the first fixed point is close to the loading end, the second fixed point is away from the loading end, and the non-loading end of the test piece is fixed by the first fixed point and the second fixed point, the base support comprises a first connecting part, a second connecting part, a first fixed part and a second fixed part, the first fixed part and the second fixed part are arranged in parallel, the first fixed part is arranged on the side close to the loading end of the test piece, the second fixed part is arranged on the side away from the loading end of the test piece, the first connecting part is connected to the test piece, and the second connecting part is connected to the testing machine, the first connecting part, the first fixed part, the second connecting part and the second fixed part are sequentially connected to form a closed ring structure, the first fixed point and the second fixed point are arranged on the first connecting part, the first fixed point is provided with two circular hole structures, the non-loading end of the test piece is fixedly connected to the two circular hole structures through bolts, the second fixed point is provided with two clamping groove structures, and the non-loading end of the test piece is fixedly connected to the two clamping groove structures through bolts, the straight line where the two circular hole structures are located is parallel to the first fixed part, and the opening directions of the two clamping groove structures are both perpendicular to the first fixed part; A clamping plate is arranged at the second fixed point and is used to fix the base support and the non-loading end of the test piece, the width of the clamping plate is not less than 2.5 times the diameter of the bolt, the thickness of the clamping plate is not less than 1.5 times the diameter of the bolt, and the length of the clamping plate is not less than 7 times the diameter of the bolt.

2. The joint proof test clamp of claim 1, wherein, The force receiving part comprises a double-ear mechanism and a force transmission rod, the force transmission rod is arranged in the two perforations of the double-ear mechanism, and the force transmission rod is connected to the testing machine.

3. The hinge proof test clamping device of claim 2, wherein, The loading part comprises a first loading unit and a second loading unit, the first loading unit and the second loading unit are arranged in parallel, the first loading unit and / or the second loading unit are perpendicular to the double-ear mechanism in the horizontal direction, the upper ends of the first loading unit and the second loading unit are fixedly connected to the connecting platform, and the lower ends of the first loading unit and the second loading unit are both provided with U-shaped grooves.

4. The hinge proof test clamping device of claim 1, wherein, The second connecting part is provided with a connecting groove, the testing machine is fixedly connected to the connecting groove through a bolt, and the opening direction of the connecting groove is perpendicular to the first fixed part.

5. The hinge proof test clamping device of claim 1, wherein, The first connecting part is further provided with a third fixed point, two square grooves are arranged at the third fixed point, and the test piece is connected to the two square grooves.

6. The hinge proof test clamping device of claim 1, wherein, The clamping plate is provided with two clamping plate perforations, and the test piece is arranged in the two clamping groove structures through the two clamping plate perforations.

7. A system for testing the static strength of a hinge, comprising a clamping device for testing the static strength of a hinge according to one of the preceding claims 1 to 6, characterized in that The hinge static strength test system further comprises a testing machine and a test piece, the testing machine acts on the test piece through the hinge static strength test clamping device, and the two ends of the test piece are respectively connected to the base support and the clamp.

Images