Loosening test device for threaded fastening structure under transverse load

Abstract

The present application relates to the technical fields of thread fastening structure loosening test device, provide a kind of thread fastening structure loosening test device under the action of transverse load, the test device includes two clamped parts, clamped part includes channel steel, flat plate, first through-hole and second through-hole;Channel steel includes web and flange, flange includes first horizontal part and second horizontal part in turn along the axial direction of channel steel, the side of second horizontal part away from web is horizontal plane;Flat plate is arranged on the side of web away from flange, first through-hole is opened on web, and second through-hole is opened on flat plate.The channel steel improved by additional structure is part of clamped part, which is conducive to better studying the loosening condition of the whole thread fastening structure, and ensures the rigidity of the flat plate of the two clamped parts during the test process, which can effectively avoid the warping phenomenon of the flat plate and the mutual jamming phenomenon between the flat plates.

Description

Technical Field

[0001] This invention relates to the technical field of threaded fastener loosening test devices, and more specifically, to a threaded fastener loosening test device under lateral load. Background Technology

[0002] Threaded fastener connections are widely used in modern engineering structures and various mechanical structures due to their high reliability, convenient disassembly, relatively low cost, and reusability, playing a crucial role in the assembly and maintenance of core mechanical equipment. While threaded fastener structures exhibit good connection performance under static loads, slippage can accumulate on the threaded contact surface under cyclic lateral loads, potentially leading to fastener loosening. This can affect the overall mechanical properties of the structure, potentially causing product failure or even major safety accidents. Therefore, conducting threaded fastener loosening tests under cyclic lateral loads is of great significance.

[0003] Currently, the commonly used testing device for loosening threaded fasteners under cyclic lateral loads is the fastener lateral vibration test bench (referencing national standard GB / T-10431-2008). This test bench applies lateral loading through an eccentric wheel mounted on a motor, and the loading amplitude and frequency are adjusted by changing the eccentricity and the rotational speed of the eccentric wheel. In existing related technologies, the clamped parts used in this type of test bench are flat plates, and the friction between the clamped parts is ignored by adding ball bearings, focusing on the loosening behavior between bolts and nuts.

[0004] However, further research revealed that the loosening of threaded fasteners is mainly caused by the relative movement between the clamped parts after overcoming friction. As a result, the current transverse vibration test bench for fasteners cannot effectively study the overall loosening of the threaded fastening structure.

[0005] Meanwhile, when using a plate as the clamping element for testing, the plate's insufficient rigidity causes severe warping during the test, and the plates may even seize up, preventing the loosening test from proceeding smoothly. Summary of the Invention

[0006] The purpose of this invention is to provide a test device for loosening of threaded fastening structures under transverse load, so as to overcome at least the technical problems of existing test devices being unable to effectively study the overall loosening of threaded fastening structures, and the plates causing severe warping and seizing between plates during the test.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A test device for loosening of threaded fasteners under lateral load includes two clamping components, each of which includes a channel steel, a plate, a first through hole, and a second through hole.

[0009] The channel steel includes a web and two flanges disposed on the same side of the web. The flanges include a first horizontal portion and a second horizontal portion in sequence along the axial direction of the channel steel. The side of the second horizontal portion away from the web is a horizontal plane.

[0010] The flat plate is disposed on the side of the web away from the flange, the first through hole is opened on the web and located between the first horizontal portions of the two flanges, and the second through hole is opened on the flat plate and is coaxial with the first through hole;

[0011] During the test phase, the flat plates of the two clamped members are in close contact with each other on the side opposite to the web plate, the ends of the channel steels of the two clamped members having the second horizontal portion are opposite to each other, and the first through holes and the second through holes of the two clamped members are aligned with each other.

[0012] In some possible embodiments, the clamped member further includes a first pad, which is embedded between the second horizontal portions of the two flanges, and the side of the first pad facing away from the web is in the same plane as the horizontal plane of the second horizontal portion.

[0013] In some possible embodiments, the clamped member further includes a second pad disposed on the side of the web away from the flange and aligned with the first pad.

[0014] In some possible embodiments, the first pad has a plurality of first countersunk holes, the web has a first connecting hole corresponding to each of the first countersunk holes, and the second pad has a first threaded hole corresponding to each of the first connecting holes.

[0015] The clamped component also includes a first hexagon socket bolt corresponding to the first countersunk hole. The first hexagon socket bolt passes through the first countersunk hole and the first connecting hole in sequence and is then threadedly connected to the first threaded hole.

[0016] In some possible embodiments, one side of the first pad extends toward the direction of the first through hole, and a clearance groove is provided on the side of the first pad near the first through hole.

[0017] In some possible embodiments, a pressure sensor is also included, which is aligned with the first through hole of one of the clamped members.

[0018] In some possible embodiments, the height of the second horizontal portion is less than the height of the first horizontal portion;

[0019] The flange also includes an arc-shaped transition section, through which the first horizontal section and the second horizontal section are connected.

[0020] In some possible embodiments, at least one of the outer sidewalls of the first horizontal portion of the flange is provided with a positioning groove, which is aligned with the first through hole.

[0021] In some possible embodiments, the flat plate has a plurality of second countersunk holes, and the side of the web away from the flange has a second threaded hole corresponding to each of the second countersunk holes;

[0022] The clamped component also includes a second hexagon socket bolt corresponding to the second countersunk hole. The second hexagon socket bolt passes through the second countersunk hole and is threadedly connected to the second threaded hole.

[0023] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0024] This invention improves upon existing test equipment by adding a channel steel structure as part of the clamped component, eliminating the need for the ball bearing structure between the two clamped components. This allows for better study of the overall loosening of the threaded fastening structure and ensures the rigidity of the two clamped components' plates during the test, effectively preventing warping and seizing, thus ensuring the smooth conduct of the test. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the test apparatus provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the experimental device provided in an embodiment of the present invention from another perspective;

[0027] Figure 3 for Figure 1 A schematic diagram of the structure of the clamped component in the experimental apparatus is shown;

[0028] Figure 4 for Figure 3 A schematic diagram of the clamped component from another perspective is shown;

[0029] Figure 5 for Figure 3 The diagram shows the structure of the channel steel in the clamped component;

[0030] Figure 6 for Figure 4A schematic diagram of the structure of the plate in the clamped component is shown;

[0031] Figure 7 for Figure 3 The diagram shows the structure of the first pad in the clamped component;

[0032] Figure 8 for Figure 3 The diagram shows the structure of the second pad in the clamped component;

[0033] Figure 9 for Figure 1 A cross-sectional view of the experimental setup is shown.

[0034] Icons: 10-Clamped part, 11-Channel steel, 11a-Positioning groove, 111-Web plate, 111a-First connecting hole, 112-Flange, 112a-First horizontal part, 112b-Arc transition part, 112c-Second horizontal part, 12-Plate plate, 12a-Second countersunk hole, 13-First through hole, 14-Second through hole, 15-First pad, 15a-Allowing groove, 15b-First countersunk hole, 16-Second pad, 16a-First threaded hole, 17-First socket head cap screw, 18-Second socket head cap screw, 20-Pressure sensor, 30-Test bolt, 40-Test nut. Detailed Implementation

[0035] Please refer to Figures 1 to 9 This embodiment provides a test device for loosening of threaded fastening structure under lateral load. The test device can better study the overall loosening of the threaded fastening structure and effectively improve the reliability of the test device during the test, ensuring that the test can be carried out smoothly. Specifically, the test device includes two clamped parts 10 and a pressure sensor 20.

[0036] In this embodiment, as Figure 1 or Figure 9 As shown, the two clamping parts 10 have the same structure and are arranged sequentially from top to bottom to facilitate clamping of the test bolt 30 and the test nut 40 during the test phase, thereby facilitating subsequent research on the loosening of the threaded fastening structure consisting of the test bolt 30, the test nut 40, and the two clamping parts 10.

[0037] Combination Figure 3 and Figure 4The clamped part 10 shown includes a channel steel 11, a flat plate 12, a first through hole 13, and a second through hole 14. The channel steel 11 is a conventional steel with a groove-shaped cross section, and the thickness of the channel steel 11 is preferably 5mm. It should be noted that in order to ensure that the rigidity of the channel steel 11 is not affected, and to facilitate fixing the clamped part 10 to the hydraulic chuck corresponding to the hydraulic fatigue testing machine during the test stage, this embodiment has made certain design improvements to the structure of the channel steel 11.

[0038] Specifically, such as Figure 5 As shown, the channel steel 11 includes a web 111 and two flanges 112 disposed on the same side of the web 111. The two flanges 112 are arranged opposite to each other and parallel to each other. At the same time, each of the two flanges 112 includes a first horizontal part 112a, an arc-shaped transition part 112b and a second horizontal part 112c in sequence along the axial direction of the channel steel 11. The first horizontal part 112a and the second horizontal part 112c are connected by the arc-shaped transition part 112b. The side of the second horizontal part 112c away from the web 111 is a horizontal plane, so as to facilitate the subsequent fixing of the channel steel 11 into the hydraulic clamp corresponding to the hydraulic fatigue testing machine.

[0039] Furthermore, in order to facilitate the processing of the channel steel 11, the height of the second horizontal portion 112c of the flange 112 is less than the height of the first horizontal portion 112a. At the same time, by using an inwardly recessed arc-shaped transition portion 112b to connect the first horizontal portion 112a and the second horizontal portion 112c, it is beneficial to further ensure that the rigidity of the channel steel 11 is not affected.

[0040] Understandably, in order to construct the channel steel 11 with the above-mentioned structure, during actual processing, it is only necessary to simultaneously cut the two flanges 112 along the axial direction of the channel steel 11 by setting a cutting surface with both an arc surface and a horizontal surface. In other words, it is only necessary to cut the two flanges 112 of the channel steel 11 to a certain extent to achieve the desired structure. Figure 5 The flange 112 shown includes a first horizontal portion 112a, an arc-shaped transition portion 112b, and a second horizontal portion 112c, thereby simplifying the machining process of the channel steel 11. At this time, the end corresponding to the second horizontal portion 112c of the flange 112 can be defined as the clamped end of the channel steel 11, and correspondingly, the end corresponding to the first horizontal portion 112a of the flange 112 can be defined as the non-clamped end of the channel steel 11.

[0041] Based on this, continue to refer to Figure 3 and Figure 4The plate 12 constituting the clamped member 10 is provided on the side of the web 111 of the channel steel 11 away from the flange 112. At this time, the first through hole 13 for the test bolt 30 to pass through is opened on the web 111 of the channel steel 11, and the first through hole 13 is located between the first horizontal part 112a of the two flanges 112, that is, the first through hole 13 is opened on the web 111 of the non-clamping end of the channel steel 11. Correspondingly, the second through hole 14 for the test bolt 30 to pass through is opened on the plate 12, and the second through hole 14 is coaxial with the first through hole 13.

[0042] It is understood that in this embodiment, the first through hole 13 on the web 111 of the channel steel 11 is selected in accordance with GB5277-1985 Fasteners Bolts and Screws Through Holes. Furthermore, the diameter of the first through hole 13 is preferably selected from the medium assembly series. For example, the diameter of the first through hole 13 can be 13.5 mm. The second through hole 14 on the plate 12 can be the same size as the first through hole 13.

[0043] Furthermore, in this embodiment, the length of the plate 12 of each clamped member 10 is 120mm and the width is 80mm. When the plate 12 is placed on the side of the web 111 of the channel steel 11 away from the flange 112, the plate 12 is aligned with the first horizontal part 112a of the flange 112. At this time, one side of the plate 12 in the length direction and two sides of the plate 12 in the width direction are flush with the corresponding side of the web 111, while the other side of the plate 12 in the length direction extends to the connection between the arc-shaped transition part 112b and the second horizontal part 112c of the flange 112, so as to ensure that the rigidity of the plate 12 is maximized during the test.

[0044] In this configuration, during the testing phase, the two clamping components 10 are arranged sequentially from top to bottom. Specifically, as follows: Figure 1 and, Figure 2 and Figure 9As shown, the flat plates 12 of the two clamped members 10 are pressed tightly together on the side opposite to the web plate 111. At this time, the non-clamping ends of the channel steels 11 of the two clamped members 10 are aligned. At the same time, the ends of the channel steels 11 of the two clamped members 10 with the second horizontal portion 112c are opposite to each other (that is, the clamping ends of the channel steels 11 of the two clamped members 10 are opposite to each other). At this time, the first through holes 13 and the second through holes 14 of the two clamped members 10 are aligned with each other. The test bolt 30 for testing passes through the first through holes 13 and the second through holes 14 of the upper clamped member 10 and the first through holes 13 and the second through holes 14 of the lower clamped member 10 from top to bottom. The test nut 40 for testing is screwed onto the test bolt 30 from the end of the test bolt 30. By screwing the test nut 40 to the preload required for the test, the two clamped members 10 are clamped by the test bolt 30 and the test nut 40, and then the subsequent test can be carried out.

[0045] It should be noted that in this embodiment, the improved channel steel 11 with added structure is used as part of the clamped component 10, and the ball bearing structure between the two clamped components 10 in the existing test device is eliminated. This is beneficial for better studying the loosening of the overall threaded fastening structure composed of the test bolt 30, the test nut 40 and the two clamped components 10, and ensures the rigidity of the plate 12 of the two clamped components 10 during the test. It can effectively prevent the plate 12 from warping and prevent the plate 12 of the two clamped components 10 from seizing each other, ensuring that the test can be carried out smoothly.

[0046] Based on this, in order to facilitate the fixing of the test device onto the hydraulic fatigue testing machine for testing, this embodiment further improves the structure of the clamped part 10.

[0047] Specifically, the clamping member 10 may further include a first pad 15 and a second pad 16, wherein, as shown in the example Figure 3 As shown, the first pad 15 is embedded between the second horizontal portions 112c of the two flanges 112 of the channel steel 11, and the side of the first pad 15 away from the web 111 is in the same plane as the horizontal plane of the second horizontal portion 112c of the flange 112. That is, by adding the first pad 15, the clamped end of the channel steel 11 can form a complete plane, which is more conducive to fixing the clamped part 10 into the hydraulic chuck corresponding to the hydraulic fatigue testing machine.

[0048] At the same time, continue to refer to Figure 3 One side of the first pad 15 extends toward the direction of the first through hole 13, so as to further enhance the rigidity of the channel steel 11. At this time, as... Figure 2 or Figure 9As shown, considering that the pressure sensor 20 used to measure the clamping force of the test bolt 30 during the test will be installed at the first through hole 13 of one of the clamped parts 10, and the pressure sensor 20 is aligned with the first through hole 13 of the clamped part 10, preferably, the pressure sensor 20 is installed at the first through hole 13 of the lower clamped part 10, and the pressure sensor 20 is located between the first horizontal portions 112a of the two flanges 112 of the channel steel 11 of the clamped part 10. During the test phase, the test bolt 30 passes through the first through holes 13 and the second through holes 14 of the two clamped parts 10 in sequence, and then passes through the pressure sensor 20 before being threadedly connected to the test nut 40. Therefore, in order to avoid interference between the pressure sensor 20 and the first pad 15, as follows... Figure 7 As shown, a clearance groove 15a adapted to the pressure sensor 20 can be formed on the side of the first pad 15 near the first through hole 13.

[0049] like Figure 3 and Figure 4 As shown, the second pad 16 is disposed on the side of the web 111 away from the flange 112 and aligned with the first pad 15. Preferably, the thickness of the second pad 16 is approximately equal to the sum of the thickness of the first pad 15, the thickness of the web 111, and twice the thickness of the plate 12. That is, assuming the thickness of the second pad 16 is n, the thickness of the first pad 15 is a, the thickness of the web 111 is b, and the thickness of the plate 12 is c, then the thickness of the second pad 16 is: n = a + b + 2c. It can be understood that by adding the second pad 16, the rigidity of the channel steel 11 can be further improved, and the accurate alignment of the two clamped parts 10 during the test assembly stage can be ensured.

[0050] At this point, in order to facilitate the installation of the first pad 15 and the second pad 16 onto the web 111 of the channel steel 11, continue referring to... Figure 7 The first pad 15 has a plurality of first countersunk holes 15b. Preferably, in this embodiment, the number of first countersunk holes 15b on the first pad 15 is two, and the two first countersunk holes 15b are symmetrically arranged on the side of the first pad 15 away from the first through hole 13. Meanwhile, as... Figure 5 As shown, the web 111 of the channel steel 11 has first connecting holes 111a corresponding one-to-one with the first countersunk holes 15b, such as... Figure 8 As shown, the second pad 16 has a first threaded hole 16a that corresponds one-to-one with the first connecting hole 111a.

[0051] At this time, as Figure 3As shown, the clamped component 10 also includes first hexagon socket head cap screws 17 corresponding to the first countersunk holes 15b. This arrangement ensures that when the first pad 15 is inserted between the second horizontal portions 112c of the two flanges 112 of the channel steel 11, the first countersunk holes 15b on the first pad 15 are aligned with the first connecting holes 111a on the web 111. Simultaneously, the second pad 16 is positioned on the side of the web 111 away from the flanges 112, and the first threaded hole 16a on the second pad 16 is aligned with the first connecting hole 111a on the web 111. Then, the first hexagon socket head cap screws 17 are... 7 passes sequentially through the first countersunk hole 15b on the first pad 15 and the first connecting hole 111a on the web 111, and is threadedly connected to the first threaded hole 16a on the second pad 16. This achieves the installation and fixation of the first pad 15 and the second pad 16 onto the web 111. The operation is simple and convenient. Furthermore, the use of hexagonal socket head cap screws as fasteners ensures that the first pad 15 is embedded between the second horizontal portions 112c of the two flanges 112 and does not protrude from the structure of the first pad 15 after installation, ensuring that the side of the first pad 15 facing away from the web 111 is a complete plane.

[0052] Correspondingly, for each clamped member 10, the flat plate 12 constituting the clamped member 10 can be mounted to the side of the web 111 opposite to the flange 112 in a similar manner. Specifically, as shown below... Figure 6 As shown, multiple second countersunk holes 12a can be formed on the plate 12. Preferably, in this embodiment, the number of second countersunk holes 12a formed on the plate 12 is six, and the six second countersunk holes 12a are distributed in a rectangular array along the outer edge of the plate 12. At the same time, a second threaded hole (not shown in the figure) corresponding to the second countersunk holes 12a is formed on the side of the web plate 111 away from the flange 112.

[0053] At this time, as Figure 4 As shown, the clamped component 10 also includes second hexagon socket head cap screws 18 that correspond one-to-one with the second countersunk holes 12a. With this configuration, when the plate 12 is placed on the side of the web 111 facing away from the flange 112, the second countersunk holes 12a on the plate 12 are aligned with the second threaded holes on the web 111. Then, the second hexagon socket head cap screws 18 pass through the second countersunk holes 12a on the plate 12 and are threadedly connected to the second threaded holes on the web 111, thus achieving a reliable connection between the plate 12 and the web 111. Similarly, using hexagon socket head cap screws as fasteners ensures that after the plate 12 and web 111 are connected, the side of the plate 12 facing away from the web 111 does not protrude from the plate 12's structure, ensuring that the side of the plate 12 facing away from the web 111 is a complete plane.

[0054] In addition, such as Figure 5As shown, in actual implementation, a positioning groove 11a can also be formed on the outer wall of the first horizontal portion 112a of at least one flange 112 of the channel steel 11 of each clamped member 10, and the positioning groove 11a is aligned with the first through hole 13. This arrangement is as follows: Figure 1 As shown, this facilitates more accurate and rapid alignment of the first through holes 13 of the two clamped parts 10 when assembling them.

[0055] To provide a clearer and more intuitive understanding of the experimental apparatus provided in this embodiment, the operating principle of the experimental apparatus will be further explained below in conjunction with a specific experimental process.

[0056] First, before the experiment begins, two clamping components 10 are assembled. The two clamping components 10 are assembled in the same way. Specifically, the first pad 15 is embedded between the second horizontal portions 112c of the two flanges 112 of the channel steel 11, with the clearance groove 15a on the first pad 15 facing the first through hole 13. The second pad 16 is placed on the side of the web 111 of the channel steel 11 away from the flanges 112. Then, the first pad 15, the web 111 of the channel steel 11, and the second pad 16 are connected in sequence using the first hexagon socket head cap screw 17. At the same time, the flat plate 12 is placed on the side of the web 111 of the channel steel 11 away from the flanges 112, and the second through hole 14 on the flat plate 12 is aligned with the first through hole 13 on the web 111 of the channel steel 11. Then, the flat plate 12 is connected to the web 111 using the second hexagon socket head cap screw 18 to fix the flat plate 12 to the web 111 of the channel steel 11. The clamped parts after assembly, such as Figure 3 and Figure 4 As shown.

[0057] After the assembly of the two clamped parts 10 is completed, one end of the channel steel 11 of one of the clamped parts 10, which is provided with the first pad 15 and the second pad 16 (i.e., the clamped end of the channel steel 11), is fixed to the upper hydraulic chuck of the hydraulic fatigue testing machine, with the flat plate 12 of the clamped part 10 facing downwards; correspondingly, one end of the channel steel 11 of the other clamped part 10, which is provided with the first pad 15 and the second pad 16, is fixed to the lower hydraulic chuck of the hydraulic fatigue testing machine, with the flat plate 12 of the clamped part 10 facing upwards. At the same time, the non-clamping end of the channel steel 11 of the clamped part 10 is opposite to the non-clamping end of the channel steel 11 of the clamped part 10.

[0058] Subsequently, the first through holes 13 of the two clamped components 10 are aligned using the positioning groove 11a on the outer wall of the first horizontal part 112a of the flange 112. The pressure sensor 20 is then placed in the first through hole 13 of the lower clamped component 10. The test bolt 30 passes through the first through holes 13 and second through holes 14 of the two clamped components 10 from top to bottom, as well as the pressure sensor 20 in the first through hole 13 of the lower clamped component 10. After the test bolt 30 passes through the pressure sensor 20, the test nut 40 is screwed onto the end of the test bolt 30 until the test nut 40 is tightened to the required preload. At this point, the sides of the flat plates 12 of the two clamped components 10 facing away from the web plate 111 are tightly pressed against each other. With the cooperation of the test bolt 30 and the test nut 40, the two clamped components 10, together with the pressure sensor 20, are reliably clamped and fixed. This completes the assembly of the entire test device. The structure of the test device at this point is as follows: Figure 9 As shown.

[0059] During the testing phase, the lower hydraulic chuck of the hydraulic fatigue testing machine remains stationary, while a transverse load with a certain stress ratio is applied to the upper hydraulic chuck. This allows for continuous adjustment of the loading amplitude. For example, the stress ratio applied to the upper hydraulic chuck can be -1. Of course, different stress ratios can also be selected according to actual testing requirements.

[0060] During the test, when the initial lateral load is small, the displacement between the plates 12 of the two clamped parts 10 is almost zero. After a certain number of cycles, the lateral load is gradually applied. When the lateral load increases to the point that it exceeds the friction between the plates 12 of the two clamped parts 10, the lateral displacement will slip significantly, and the preload of the test nut 40 will also decrease significantly, thus causing it to loosen.

[0061] It should be noted that during the test, the clamping force of the test bolt 30 is measured in real time by the pressure sensor 20 located at the first through hole 13 of the clamped part 10 below, while the lateral load and displacement of the two clamped parts 10 plate 12 are measured by the pressure sensor and displacement sensor built into the hydraulic chuck of the hydraulic fatigue testing machine.

[0062] In summary, the test apparatus provided by this invention, during the test phase, uses a hydraulic fatigue testing machine to drive the channel steel 11 of the clamped part 10 to reciprocate, transferring the lateral load of the hydraulic fatigue testing machine to the test bolt 30 and the test nut 40. This allows for the study of the loosening characteristics of the threaded fastening structure composed of the test bolt 30, the test nut 40, and the two clamped parts 10. The test apparatus ensures the rigidity of the plate 12 of the two clamped parts 10, effectively preventing warping of the plate 12 and preventing the plate 12 from seizing together, thus ensuring the smooth conduct of the test.

[0063] Meanwhile, during the testing phase, the lateral load amplitude was adjustable, enabling real-time detection of changes in clamping force, lateral load, and displacement of the test bolt 30. It also allows for the study of the loosening characteristics of the threaded fastener structure from an overall structural perspective, which is beneficial for evaluating the effectiveness of various anti-loosening methods and thus provides a reference for the design of related threaded fasteners.

[0064] Furthermore, in actual testing, different materials of plate 12 can be selected as clamping elements 10 according to the specific requirements of the test, thereby enabling the study of the loosening characteristics of threaded fastening structures composed of clamping elements 10 of different materials. At the same time, if the test only needs to study the loosening characteristics of steel materials, the plate 12 constituting the clamping element 10 can be omitted, and the channel steel 11 can be used directly as the clamping element 10 for the test.

[0065] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A test device for loosening of threaded fasteners under lateral load, characterized in that, It includes two clamping components, each of which includes a channel steel, a plate, a first through hole, and a second through hole; The channel steel includes a web and two flanges disposed on the same side of the web. The flanges include a first horizontal portion and a second horizontal portion in sequence along the axial direction of the channel steel. The side of the second horizontal portion away from the web is a horizontal plane. The flat plate is disposed on the side of the web away from the flange, the first through hole is opened on the web and located between the first horizontal portions of the two flanges, and the second through hole is opened on the flat plate and is coaxial with the first through hole; During the test phase, the flat plates of the two clamped members are in close contact with each other on the side opposite to the web plate, the ends of the channel steels of the two clamped members having the second horizontal portion are opposite to each other, and the first through holes and the second through holes of the two clamped members are aligned with each other.

2. The test device for loosening of threaded fasteners under lateral load as described in claim 1, characterized in that, The clamped component further includes a first pad, which is embedded between the second horizontal portion of the two flanges. The side of the first pad away from the web is in the same plane as the horizontal plane of the second horizontal portion.

3. The test device for loosening of threaded fasteners under lateral load according to claim 2, characterized in that, The clamped component further includes a second pad, which is disposed on the side of the web away from the flange and aligned with the first pad.

4. The test device for loosening of threaded fasteners under lateral load according to claim 3, characterized in that, The first pad has a plurality of first countersunk holes, the web has a first connecting hole corresponding to each of the first countersunk holes, and the second pad has a first threaded hole corresponding to each of the first connecting holes. The clamped component also includes a first hexagon socket bolt corresponding to the first countersunk hole. The first hexagon socket bolt passes through the first countersunk hole and the first connecting hole in sequence and is then threadedly connected to the first threaded hole.

5. The test device for loosening of threaded fasteners under lateral load according to claim 2, characterized in that, One side of the first pad extends toward the direction of the first through hole, and a clearance groove is provided on the side of the first pad near the first through hole.

6. The test device for loosening of threaded fasteners under lateral load according to claim 1, characterized in that, It also includes a pressure sensor, which is aligned with the first through hole of one of the clamped members.

7. The test device for loosening of threaded fasteners under lateral load according to claim 1, characterized in that, The height of the second horizontal section is less than the height of the first horizontal section; The flange also includes an arc-shaped transition section, through which the first horizontal section and the second horizontal section are connected.

8. The test device for loosening of threaded fasteners under lateral load according to claim 1, characterized in that, At least one of the flanges has a positioning groove on the outer side wall of the first horizontal portion, and the positioning groove is aligned with the first through hole.

9. The test device for loosening of threaded fasteners under lateral load according to claim 1, characterized in that, The flat plate has multiple second countersunk holes, and the web plate has a second threaded hole corresponding to each of the second countersunk holes on the side opposite to the flange. The clamped component also includes a second hexagon socket bolt corresponding to the second countersunk hole. The second hexagon socket bolt passes through the second countersunk hole and is threadedly connected to the second threaded hole.

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