Bolt vibration test system

Abstract

The invention provides a bolt vibration test system, and the system comprises a mounting seat which comprises a fixed seat and a movable seat, the movable seat is movably disposed relative to the fixed seat along a first direction and a second direction which are perpendicular to each other, and the mounting seat is provided with at least one mounting station for mounting a bolt assembly; the at least one group of mounting auxiliary parts are correspondingly arranged at the at least one mounting station, the mounting auxiliary parts comprise a first auxiliary part and a second auxiliary part, the first auxiliary part is mounted on one of the movable seat and the fixed seat, and the second auxiliary part is mounted on the other one of the movable seat and the fixed seat; the bolt assembly and the mounting seat form a bolt connecting structure through the first auxiliary part and the second auxiliary part; the loading device is configured to apply vibration loads in the first direction and the second direction to the movable base at the same time. According to the bolt vibration test system provided by the invention, bolt vibration test conditions closer to actual working conditions can be obtained.

Description

Technical Field

[0001] The present disclosure relates to the field of bolt testing, and in particular to a bolt vibration testing system. Background Art

[0002] Bolt connection is the main connection form of engineering machinery. Under the action of external load, the preload of bolt connection will gradually decay or even completely lose, which is one of the key reasons for the loosening or even breaking of bolts, seriously affecting the reliability of the connection of the host product. Therefore, before the bolt connection is applied in the project, it is usually necessary to conduct anti-loosening performance testing and evaluation.

[0003] At present, the performance test of bolted connections mainly uses vibration test benches, which apply lateral alternating loads to the tested bolted connections and detect the changes in preload to judge the anti-loosening effect. The typical representative is the junker test machine. However, this equipment has problems such as a single loading method and a large difference between the test conditions and the actual working conditions, which makes it difficult to meet the needs of multiple bolts and composite loading. Summary of the invention

[0004] The purpose of the present disclosure is to provide a bolt vibration test system to obtain bolt vibration test conditions that are closer to actual working conditions.

[0005] The present disclosure provides a bolt vibration test system for vibration testing of a bolt assembly, wherein the bolt assembly comprises a bolt and a nut adapted to each other, and the bolt vibration test system comprises:

[0006] A mounting seat, comprising a fixed seat and a movable seat, wherein the movable seat is movably arranged relative to the fixed seat along a first direction and a second direction perpendicular to each other, and the mounting seat is provided with at least one installation station for installing the bolt assembly;

[0007] At least one group of installation auxiliary parts, correspondingly arranged at at least one of the installation stations, the installation auxiliary parts include a first auxiliary part and a second auxiliary part, the first auxiliary part is installed on one of the movable seat and the fixed seat, the second auxiliary part is installed on the other of the movable seat and the fixed seat, the first auxiliary part has a first hole for passing the bolt and a first surface for positioning the head of the bolt, the second auxiliary part has a second hole for passing the bolt and a second surface for tightening the nut screwed on the bolt, so that the bolt assembly forms a bolt connection structure with the mounting seat through the first auxiliary part and the second auxiliary part; and

[0008] The loading device is configured to apply vibration loads along the first direction and along the second direction to the movable seat simultaneously.

[0009] In some embodiments, the first auxiliary component is a bolt anti-rotation sleeve, which is installed on the fixing seat and is configured to be sleeved on the head of the bolt and limit the head of the bolt from rotating around its own axis, so as to limit the bolt from rotating around its own axis relative to the fixing seat.

[0010] In some embodiments, the hollow portion of the bolt anti-rotation sleeve is formed by the first hole and the third hole arranged in sequence along its own axial direction, and the third hole is configured to adapt to the shape of the head of the bolt to limit the rotation of the head of the bolt around its own axis.

[0011] In some embodiments, a pre-tightening force detection device is further included, and the pre-tightening force detection device is configured to detect the pre-tightening force of the bolt.

[0012] In some embodiments,

[0013] The preload force detection device includes a pressure sensor;

[0014] The mounting auxiliary component further comprises a fixing sleeve, one end of which along its axial direction is fitted on the fixing seat, and the other end of which is provided with a flange, and a mounting interval is formed between the flange and the fixing seat along the axial direction of the fixing sleeve, the pressure sensor is arranged in the mounting interval, and both the fixing seat and the fixing sleeve act on the pressure sensor;

[0015] The first auxiliary component is a bolt anti-rotation sleeve, which is detachably mounted on the hollow portion of the fixed sleeve and is configured to be mounted on the head of the bolt and limit the head of the bolt from rotating around its own axis, so as to limit the bolt from rotating around its own axis relative to the fixed seat, and the fixed sleeve has a third surface. When the bolt anti-rotation sleeve is mounted on the hollow portion of the fixed sleeve, the third surface limits an end of the bolt anti-rotation sleeve close to the movable seat to move away from an end of the fixed sleeve close to the movable seat along the second direction.

[0016] In some embodiments, each group of the installation auxiliary parts includes a plurality of the first auxiliary parts that can be selectively installed on one of the movable seat and the fixed seat and a plurality of the second auxiliary parts that can be selectively installed on the other of the movable seat and the fixed seat, and different first auxiliary parts and second auxiliary parts are used to adapt to bolt assemblies of different specifications.

[0017] In some embodiments, each set of the installation aids further includes a plurality of test gaskets, and different test gaskets are used to adapt to the bolt assemblies of different specifications.

[0018] In some embodiments, the loading device includes a first loading device for applying a vibration load along the first direction and a second loading device for applying a vibration load along the second direction to the movable seat, wherein:

[0019] The first loading device comprises a first oil cylinder and a first displacement sensor, the first oil cylinder is configured to drive the movable seat to reciprocate along the first direction, and the first displacement sensor is configured to detect the displacement of the movable part of the first oil cylinder along the first direction; and / or

[0020] The second loading device includes a second oil cylinder and a second displacement sensor, the second oil cylinder is configured to drive the movable seat to reciprocate along the second direction, and the second displacement sensor is configured to detect the displacement of the movable part of the second oil cylinder along the second direction.

[0021] In some embodiments, the loading device includes a first loading device for applying a vibration load to the movable seat along the first direction and a second loading device for applying a vibration load along the second direction, the first loading device is fixed to the movable seat along the first direction and movably connected along the second direction, and the second loading device is fixedly connected to the movable seat.

[0022] In some embodiments, it also includes:

[0023] a first slide rail, wherein the movable seat is movably connected to the fixed seat along the first direction via the first slide rail; and / or

[0024] A slide rail connecting frame and a second slide rail installed on the slide rail connecting frame, one of the movable seat and the first loading device is fixedly connected to the slide rail connecting frame, and the other of the movable seat and the first loading device is movably connected to the slide rail connecting frame along the second direction through the second slide rail.

[0025] In the bolt vibration test system provided by the embodiment of the present disclosure, the movable seat can reciprocate in the first direction and the second direction at the same time under the action of the loading device, so as to simultaneously apply a composite vibration load from the lateral and axial directions to the bolt assembly installed on the mounting seat, and the loading form of the bolt assembly is closer to the loading form of the bolt assembly in actual use occasions. In addition, in the bolt vibration test system provided by the embodiment of the present disclosure, multiple bolt assembly installation stations can be set, and the anti-loosening performance tests of multiple bolt assemblies can be carried out simultaneously.

[0026] It can be seen that the bolt vibration test system provided by the embodiments of the present invention can obtain bolt vibration test conditions that are closer to actual working conditions, and meet the testing requirements of the anti-loosening performance of multiple bolt connection structures under lateral and axial combined load conditions, thereby improving the effectiveness of the test conclusions on the anti-loosening performance of bolt connections and the guiding significance of the test conclusions for engineering practice.

[0027] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0029] Figure 1 It is a schematic structural diagram of a bolt vibration test system according to some embodiments of the present disclosure.

[0030] Figure 2 It is a schematic diagram of a mounting base of a bolt vibration test system and a cross-sectional structure perpendicular to a first direction according to some embodiments of the present disclosure.

[0031] Figure 3 It is a schematic diagram of the structure of the first loading device or the second loading device of the bolt vibration testing system of some embodiments of the present disclosure.

[0032] Figure 4 Schematic diagram of the control principle of a bolt vibration test system according to some embodiments of the present disclosure.

[0033] In the accompanying drawings, the reference numerals represent:

[0034] 1. Hydraulic station; 2. Control device; 3. Frame; 4. First loading device; 41. First displacement sensor; 42. First connecting frame; 43. First servo valve; 44. First oil cylinder; 51. Second slide rail; 52. Slide rail connecting frame; 6. Bolt assembly; 61. Bolt; 62. Nut; 71. Bolt anti-rotation sleeve; 72. Test disc; 73. Fixed sleeve; 74. Test gasket; 75. Pressure sensor; 8. Second loading device; 81. Second displacement sensor; 82. Second connecting frame; 83. Second servo valve; 84. Second oil cylinder; 9. Mounting seat; 91. Fixed seat; 92. Movable seat; 93. First slide rail. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present disclosure. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, these technologies, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0037] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0038] In the description of the present disclosure, it is necessary to understand that the orientation or positional relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0039] refer to Figures 1 to 4 The embodiment of the present disclosure provides a bolt vibration test system for vibration testing of a bolt assembly 6. The bolt assembly 6 includes a bolt 61 and a nut 62 adapted to each other, and is characterized in that the bolt vibration test system includes a mounting seat 9, at least one set of mounting auxiliary parts and a loading device.

[0040] The mounting seat 9 includes a fixed seat 91 and a movable seat 92 . The movable seat 92 is movably arranged relative to the fixed seat 91 along a first direction x and a second direction y that are perpendicular to each other. The mounting seat 9 is provided with at least one installation station for installing the bolt assembly 6 .

[0041] At least one group of installation auxiliary parts is correspondingly arranged at at least one installation station, and the installation auxiliary parts include a first auxiliary part and a second auxiliary part. The first auxiliary part is installed on one of the movable seat 92 and the fixed seat 91, and the second auxiliary part is installed on the other of the movable seat 92 and the fixed seat 91. The first auxiliary part has a first hole for passing the bolt 61 and a first surface for positioning the head of the bolt 61. The second auxiliary part has a second hole for passing the bolt 61 and a second surface for tightening the nut 62 screwed on the bolt 61, so that the bolt assembly 6 forms a bolt connection structure with the mounting seat 9 through the first auxiliary part and the second auxiliary part.

[0042] The loading device is configured to apply a vibration load in the first direction x and in the second direction y to the movable seat 92 simultaneously.

[0043] Optionally, refer to Figure 1 The bolt vibration test system also includes a frame 3 , a mounting seat 9 is arranged inside the frame 3 and the position of the mounting seat 9 relative to the frame 3 along the second direction y is adjustable, and the loading device is installed on the frame 3 .

[0044] Optionally, the fixed seat 91 and the movable seat 92 are plate-shaped, the thickness directions of the fixed seat 91 and the movable seat 92 are along the second direction y, and the fixed seat 91 and the movable seat 92 are stacked along the second direction y. Considering the structural form of the bolt connection and the vibration load applied to the movable seat 92 by the loading device, in order to ensure that the test conditions are close to the actual working conditions of the bolt assembly 6, in the present disclosure, the movable seat 92 can move relative to the fixed seat 91 in the first direction x and the second direction y. The range can reach the millimeter level.

[0045] The first auxiliary member and the second auxiliary member can be fixedly connected to the movable seat 92 or the fixed seat 91 through a connecting member, or can be connected to the movable seat 92 and the fixed seat 91 through a matching relationship. During the test, the axis of the first hole of the first auxiliary member and the axis of the second hole of the second auxiliary member are both arranged along the second direction y and the positions correspond, so that the axial direction of the bolt 61 is consistent with the second direction y. Optionally, the first auxiliary member is installed on the fixed seat 91, and the second auxiliary member is installed on the movable seat 92.

[0046] During the test, the bolt 61 is passed through the first hole, and the head of the bolt 61 is placed close to the end face of the rod against the first surface. The bolt 61 is then passed through the second hole, and the nut 62 is screwed from the tail of the bolt 61 until the nut 62 is tightened on the second surface. This allows the bolt assembly 6 and the mounting base 9 to form a bolt connection structure.

[0047] In the bolt vibration test system provided by the embodiment of the present disclosure, the movable seat 92 can reciprocate in the first direction x and the second direction y at the same time under the action of the loading device, so as to simultaneously apply a composite vibration load from the lateral and axial directions to the bolt assembly 6 installed on the mounting seat 9, and the loading form of the bolt assembly 6 is closer to the loading form of the bolt assembly 6 in actual use occasions. In addition, in the bolt vibration test system provided by the embodiment of the present disclosure, multiple bolt assembly installation stations can be set, and the anti-loosening performance tests of multiple bolt assemblies can be carried out simultaneously.

[0048] It can be seen that the bolt vibration test system provided by the embodiments of the present invention can obtain bolt vibration test conditions that are closer to actual working conditions, and meet the testing requirements of the anti-loosening performance of multiple bolt connection structures under lateral and axial combined load conditions, thereby improving the effectiveness of the test conclusions on the anti-loosening performance of bolt connections and the guiding significance of the test conclusions for engineering practice.

[0049] In some embodiments, reference Figure 2 The first auxiliary component is a bolt anti-rotation sleeve 71, which is installed on the fixing seat 91 and is configured to be sleeved on the head of the bolt 61 and limit the head of the bolt 61 from rotating around its own axis, so as to limit the bolt 61 from rotating around its own axis relative to the fixing seat 91.

[0050] The bolt anti-rotation sleeve 71 can be directly mounted on the fixing seat 91, or indirectly mounted on the fixing seat 91 through other components. By providing the bolt anti-rotation sleeve 71, the bolt 61 can be prevented from rotating relative to the mounting seat 9, thereby improving the efficiency of mounting the bolt assembly 6 on the mounting seat 9.

[0051] Optionally, refer to Figure 2 The second auxiliary component is a test disc 72, the second hole penetrates the thickness direction of the test disc 72, the movable seat 92 is provided with a disc mounting groove, the test disc 72 is installed in the disc mounting groove and is fixedly connected to the movable seat 92 through a threaded connector. Optionally, refer to Figure 2 The disc installation groove partially penetrates the movable seat 92 along the second direction y, and a through hole for the bolt 61 to pass through is provided at the bottom of the disc installation groove. During the test, the bolt 61 passes through the first hole, the through hole of the movable seat 92 and the second hole in sequence.

[0052] In some embodiments, reference Figure 2 The hollow portion of the bolt anti-rotation sleeve 71 is formed by a first hole and a third hole sequentially arranged along its own axial direction, and the third hole is configured to adapt to the shape of the head of the bolt 61 to limit the rotation of the head of the bolt 61 around its own axis.

[0053] Optionally, refer to Figure 2, the diameter of the first hole is smaller than the diameter of the third hole, and the first surface is the axial end face of the third hole at the connection position with the first hole. Optionally, the axial cross-section of the third hole is a regular hexagon to match the regular hexagonal bolt head. For bolt heads of other shapes, the shape of the axial cross-section of the third hole can be adaptively adopted to match the shape. Optionally, each set of mounting aids includes a plurality of bolt anti-rotation sleeves 71 that can be selectively mounted on one of the movable seat 92 and the fixed seat 91, and the third holes of different bolt anti-rotation sleeves 71 have different shapes and / or sizes to match the heads of bolts 61 of different specifications.

[0054] Of course, in order to expand the application scope of the same bolt anti-rotation sleeve 71, the shape of the axial cross-section of the third hole may also be different from the shape of the head of the bolt 61, as long as it can accommodate the head of the bolt 61 and limit the rotation of the head of the bolt 61 around its own axis.

[0055] In some embodiments, the bolt vibration test system includes a preload force detection device, which is configured to detect the preload force of the bolt 61 .

[0056] According to the change of the pre-tightening force during the test, it can be judged whether the anti-loosening performance of the bolt connection structure formed by the bolt assembly 6 meets the requirements of actual use.

[0057] In some embodiments, reference Figure 2 The preload force detection device includes a pressure sensor 75. The installation auxiliary part also includes a fixing sleeve 73, one end of the fixing sleeve 73 along its own axial direction is matched and installed in the fixing seat 91, and the other end is provided with a flange, and an installation interval is formed between the flange and the fixing seat 91 along the axial direction of the fixing sleeve 73. The pressure sensor 75 is arranged in the installation interval and the fixing seat 91 and the fixing sleeve 73 both act on the pressure sensor 75. The first auxiliary part is a bolt anti-rotation sleeve 71, which is detachably installed in the hollow part of the fixing sleeve 73 and is configured to be sleeved on the head of the bolt 61 and limit the head of the bolt 61 from rotating around its own axis, so as to limit the bolt 61 from rotating around its own axis relative to the fixing seat 91, and the fixing sleeve 73 has a third surface, and when the bolt anti-rotation sleeve 71 is installed in the hollow part of the fixing sleeve 73, the third surface limits the end of the bolt anti-rotation sleeve 71 close to the movable seat 92 to move away from the end of the fixing sleeve 73 close to the movable seat 92 along the second direction y.

[0058] Optionally, refer to Figure 2 The outer circumferential surface of one end of the bolt anti-rotation sleeve 71 along its own axial direction is stepped, and the inner circumferential surface of one end of the fixing sleeve 73 along its own axial direction is stepped. The stepped outer circumferential surface of the threaded anti-rotation sleeve 71 and the stepped inner circumferential surface of the fixing sleeve 73 cooperate with each other, and the third surface is the surface of the stepped inner circumferential surface of the fixing sleeve 73 that is perpendicular to its own axial direction.

[0059] In this embodiment, the fixing sleeve 73 and the fixing seat 91 can jointly play the role of fixing the pressure sensor 75, and the third surface plays the role of limiting the position of the bolt anti-rotation sleeve 71 along the second direction y. During the test, the preload force of the bolt 61 acts on the bolt anti-rotation sleeve 71 and is transmitted from the bolt anti-rotation sleeve 71 to the fixing sleeve 73 through the third surface. The fixing sleeve 73 applies pressure to the pressure sensor 75. The reading of the pressure sensor 75 is numerically equal to the preload force of the bolt 61, and the change in its reading can reflect the change in the bolt preload force.

[0060] In this embodiment, the bolt anti-rotation sleeve 71 and the fixing sleeve 73 jointly play the role of installing the bolt assembly 6 on the fixing seat 91. Since the bolt anti-rotation sleeve 71 and the fixing sleeve 73 are separately arranged, and the bolt anti-rotation sleeve 71 is detachable relative to the fixing sleeve 73, when it is necessary to disassemble or assemble the bolt assembly 6, it is only necessary to disassemble or install the bolt anti-rotation sleeve 71 at the same time, and there is no need to remove the fixing sleeve 73 from the mounting seat 9. The bolt anti-rotation sleeve 71 itself is relatively light, so the process of disassembling and installing the bolt assembly 6 is also more convenient.

[0061] Optionally, the bolt vibration test system further includes a combination of the aforementioned pressure sensor 75 , the threaded anti-rotation sleeve 71 and the fixing sleeve 73 .

[0062] In some embodiments, each group of installation auxiliary parts includes a plurality of first auxiliary parts that can be selectively installed on one of the movable seat 92 and the fixed seat 91 and a plurality of second auxiliary parts that can be selectively installed on the other of the movable seat 92 and the fixed seat 91. Different first auxiliary parts and second auxiliary parts are used to adapt to bolt assemblies 6 of different specifications.

[0063] Optionally, the diameters of the first holes of different first auxiliary parts are different, and the diameters of the second holes of different second auxiliary parts are different.

[0064] In some embodiments, reference Figure 2 Each set of installation auxiliary parts also includes multiple test gaskets 74, and different test gaskets 74 are used to adapt to bolt assemblies 6 of different specifications.

[0065] Optionally, the second auxiliary component is a test disc 72, an axial end surface of the test disc 72 is provided with a gasket receiving groove, and the test gasket 74 is arranged in the gasket receiving groove.

[0066] By providing a plurality of first auxiliary parts, second auxiliary parts and test gaskets 74 for adapting to bolt assemblies 6 of different specifications, the bolt vibration test system can be adapted to vibration tests of a variety of different bolts.

[0067] In some embodiments, reference Figure 1 and Figure 3The loading device includes a first loading device 4 for applying a vibration load along a first direction x to the movable seat 92 and a second loading device 8 for applying a vibration load along a second direction y. The first loading device 4 includes a first oil cylinder 44 and a first displacement sensor 41. The first oil cylinder 44 is configured to drive the movable seat 92 to reciprocate along the first direction x, and the first displacement sensor 41 is configured to detect the displacement of the movable part of the first oil cylinder 44 along the first direction x. The second loading device 8 includes a second oil cylinder 84 and a second displacement sensor 81. The second oil cylinder 84 is configured to drive the movable seat 92 to reciprocate along the second direction y, and the second displacement sensor 81 is configured to detect the displacement of the movable part of the second oil cylinder 84 along the second direction y.

[0068] In this embodiment, the first loading device 4 and the second loading device 8 are provided separately, and the vibration load along the first direction x and the vibration load along the second direction y can be adjusted independently according to the test requirements, thereby independently adjusting the lateral load and axial load on the bolt assembly 6. Figure 3 The first loading device 4 and the second loading device 8 may adopt the same structural form. Optionally, the first loading device 4 further includes a first connecting frame 42 disposed on the first oil cylinder 44, the first displacement sensor 41 is mounted on the first connecting frame 42, and the second connecting frame 82 further includes a second connecting frame 82 disposed on the second oil cylinder 84, and the second displacement sensor 81 is mounted on the second connecting frame 82.

[0069] Optionally, the first loading device 4 further includes a first servo valve 43 for controlling the action of the first oil cylinder 44, and the second loading device 8 further includes a second servo valve 83 for controlling the action of the second oil cylinder 84. The first servo valve 43 can be installed on the cylinder body of the first oil cylinder 44, and the second servo valve 83 can be installed on the cylinder body of the second oil cylinder 84. Figure 1 , Figure 3 The bolt vibration test system also includes a hydraulic station 1, which is a power source of the loading device, and supplies oil to the first oil cylinder 44 through the first servo valve 43 and supplies oil to the second oil cylinder 84 through the second servo valve 83.

[0070] Optionally, refer to Figure 4The bolt vibration test system also includes a control device 2. The control device 2 is connected to the pressure sensor 75, the first servo valve 43, the first displacement sensor 41, the second servo valve 83, and the second displacement sensor 81 by signal. The control device 2 can change the displacement and action frequency of the movable parts of the corresponding oil cylinder by sending control instructions to the first servo valve 43 and the second servo valve 83 to adjust their valve positions and openings, so as to apply a vibration load along the first direction x and a vibration load along the second direction y in a certain proportion according to specific test requirements. The control device 2 can determine whether the vibration load applied by the loading device meets the requirements by obtaining the readings of the first displacement sensor 41 and the second displacement sensor 81 in real time, and can determine the change of the preload force of the bolt 61 by obtaining the readings of the pressure sensor 75 in real time.

[0071] Optionally, the bolt vibration test system also includes an input device and an output device connected to the control device 2 by signal, the input device is configured to input parameters required for the test, such as the vibration load along the first direction x and the vibration load along the second direction y, and the output device is configured to output test data, such as changes in the readings of the pressure sensor 75 during the test.

[0072] In some embodiments, reference Figure 1 The loading device includes a first loading device 4 for applying a vibration load along a first direction x to the movable seat 92 and a second loading device 8 for applying a vibration load along a second direction y. The first loading device 4 is fixed to the movable seat 92 along the first direction x and movably connected to the second direction y. The second loading device 8 is fixedly connected to the movable seat 92.

[0073] In some embodiments, reference Figure 2 The bolt vibration test system further includes a first slide rail 93. The movable seat 92 is movably connected to the fixed seat 91 along the first direction x through the first slide rail 93.

[0074] In some embodiments, reference Figure 1 The bolt vibration test system further includes a slide rail connecting frame 52 and a second slide rail 51 mounted on the slide rail connecting frame 52. One of the movable seat 92 and the first loading device 4 is fixedly connected to the slide rail connecting frame 52, and the other of the movable seat 92 and the first loading device 4 is movably connected to the slide rail connecting frame 52 along the second direction y through the second slide rail 51.

[0075] In some embodiments, the bolt vibration test system includes a combination of the first slide rail 93 and the second slide rail 51 described above.

[0076] Optionally, refer to Figure 1, the movable seat 92 is fixedly connected to the slide rail connecting frame 52, and the first loading device 4 is movably connected to the slide rail connecting frame 52 along the second direction y through the second slide rail 51. Figure 1 The slide rail connecting frame 52 is L-shaped, and the slide rail connecting frame 52 includes a first frame body arranged along the first direction x and a second frame body arranged along the second direction y, and the second slide rail 51 is installed on the second frame body.

[0077] Optionally, both the first slide rail 93 and the second slide rail 51 may be heavy-duty slide rails, so as to ensure the stability of the movement of the movable seat 92 during the test by ensuring the bearing capacity.

[0078] During the test, the second loading device 8 can directly transfer the force along the second direction y to the movable seat 92, and transfer the force along the second direction y to the second slide rail 51 through the slide rail connecting frame 51, so that the second slide rail 51 reciprocates along the second direction y relative to the first loading device 4; the first loading device 4 transfers the force along the first direction x to the movable seat 92 through the second slide rail 51 and the slide rail connecting frame 52, so that the movable seat 92 reciprocates along the first direction x. The connection form of the first loading device 4 and the movable seat 9 in the above embodiment can prevent the first loading device 4 from being affected by the force along the second direction y transmitted by the second loading device 8, and realize the synchronous and independent control of the force along the first direction x and the force along the second direction y.

[0079] The working mode of the bolt vibration test system of some embodiments of the present disclosure is further described below with reference to the accompanying drawings. The bolt vibration test system includes the aforementioned hydraulic station 1, the control device 2, the frame 3, the first displacement sensor 41, the first connecting frame 42, the first servo valve 43, the first oil cylinder 44, the second slide rail 51, the slide rail connecting frame 52, the bolt anti-rotation sleeve 71, the test disc 72, the fixed sleeve 73, the test gasket 74, the pressure sensor 75, the second displacement sensor 81, the second connecting frame 82, the second servo valve 83, the second oil cylinder 84, the fixed seat 91, the movable seat 92 and the first slide rail 93. The functions and connection methods of each component can refer to the relevant description above.

[0080] The specific test process of the bolt vibration test system is as follows.

[0081] The first step is to install the bolt 61 of the bolt assembly 6 to be tested into the bolt anti-rotation sleeve 71;

[0082] The second step is to place the test gasket 74 on the test disc 72, install the bolt anti-rotation sleeve 71 into the hollow part of the fixed sleeve 73, pass the bolt 61 through the movable seat 92, the test disc 72, and the test gasket 74 in sequence, and screw the nut 62 onto the bolt 61 until it is pressed against the test gasket 74 with a certain pre-tightening force;

[0083] The second step is to set the lateral vibration parameters and axial vibration parameters of the bolt assembly 6 through the control device 2, including the vibration frequency, amplitude and test time;

[0084] The third step is to apply vibration loads in the first direction x and the second direction y to the movable plate 92 through the first loading device 4 and the second loading device 8 respectively according to the set test parameters, so as to perform a vibration test on the bolt assembly 6;

[0085] The fourth step is to collect parameter information and its changes during the entire test process through the control system 2, such as bolt preload, lateral load, axial load, vibration frequency, etc.;

[0086] Step 5: After the vibration test is completed, record and save the test data.

[0087] In some embodiments, the control device described above can be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof for performing the functions described in the present disclosure.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solution for protection requested by the present disclosure.

Claims

1. A bolt vibration test system, used for vibration testing of a bolt assembly (6), wherein the bolt assembly (6) comprises a bolt (61) and a nut (62) adapted to each other, characterized in that: The bolt vibration test system comprises: A mounting seat (9), comprising a fixed seat (91) and a movable seat (92), the movable seat (92) being movably arranged relative to the fixed seat (91) along a first direction (x) and a second direction (y) that are perpendicular to each other, the mounting seat (9) being provided with at least one installation station for installing the bolt assembly (6); at least one set of installation auxiliary parts, arranged correspondingly at at least one of the installation stations, the installation auxiliary parts comprising a first auxiliary part and a second auxiliary part, the first auxiliary part being mounted on one of the movable seat (92) and the fixed seat (91), the second auxiliary part being mounted on the other of the movable seat (92) and the fixed seat (91), the first auxiliary part having a first hole for passing the bolt (61) and a first surface for positioning the head of the bolt (61), the second auxiliary part having a second hole for passing the bolt (61) and a second surface for tightening the nut (62) screwed on the bolt (61), so that the bolt assembly (6) forms a bolt connection structure with the installation seat (9) through the first auxiliary part and the second auxiliary part; and The loading device is configured to simultaneously apply a vibration load along the first direction (x) and along the second direction (y) to the movable seat (92).

2. The bolt vibration test system according to claim 1, characterized in that: The first auxiliary component is a bolt anti-rotation sleeve (71), which is mounted on the fixing seat (91) and is configured to be sleeved on the head of the bolt (61) and to limit the head of the bolt (61) from rotating around its own axis, thereby limiting the bolt (61) from rotating around its own axis relative to the fixing seat (91).

3. The bolt vibration test system according to claim 2, characterized in that: The hollow portion of the bolt anti-rotation sleeve (71) is formed by the first hole and the third hole which are arranged in sequence along its own axial direction, and the third hole is configured to be adapted to the shape of the head of the bolt (61) so as to limit the rotation of the head of the bolt (61) around its own axis.

4. The bolt vibration test system according to claim 1, characterized in that: It also includes a pre-tightening force detection device, which is configured to detect the pre-tightening force of the bolt (61).

5. The bolt vibration test system according to claim 4, characterized in that: The preload force detection device comprises a pressure sensor (75); The mounting auxiliary component further comprises a fixing sleeve (73), one end of the fixing sleeve (73) along its own axial direction is fitted on the fixing seat (91), and the other end is provided with a flange, a mounting gap is formed between the flange and the fixing seat (91) along the axial direction of the fixing sleeve (73), the pressure sensor (75) is arranged in the mounting gap, and both the fixing seat (91) and the fixing sleeve (73) act on the pressure sensor (75); The first auxiliary component is a bolt anti-rotation sleeve (71), which is detachably mounted on the hollow portion of the fixed sleeve (73) and is configured to be mounted on the head of the bolt (61) and limit the head of the bolt (61) from rotating around its own axis, so as to limit the bolt (61) from rotating around its own axis relative to the fixed seat (91), and the fixed sleeve (73) has a third surface. When the bolt anti-rotation sleeve (71) is mounted on the hollow portion of the fixed sleeve (73), the third surface limits an end of the bolt anti-rotation sleeve (71) close to the movable seat (92) to move away from an end of the fixed sleeve (73) close to the movable seat (92) along the second direction (y).

6. The bolt vibration test system according to claim 1, characterized in that: Each group of the installation auxiliary parts includes a plurality of the first auxiliary parts that can be selectively installed on one of the movable seat (92) and the fixed seat (91) and a plurality of the second auxiliary parts that can be selectively installed on the other of the movable seat (92) and the fixed seat (91), and different first auxiliary parts and second auxiliary parts are used to adapt to bolt assemblies (6) of different specifications.

7. The bolt vibration test system according to claim 6, characterized in that: Each set of the installation auxiliary parts also includes a plurality of test gaskets (74), and different test gaskets (74) are used to match the bolt assemblies (6) of different specifications.

8. The bolt vibration test system according to any one of claims 1 to 7, characterized in that: The loading device comprises a first loading device (4) for applying a vibration load along the first direction (x) and a second loading device (8) for applying a vibration load along the second direction (y) to the movable seat (92), wherein: The first loading device (4) comprises a first oil cylinder (44) and a first displacement sensor (41), the first oil cylinder (44) being configured to drive the movable seat (92) to reciprocate along the first direction (x), and the first displacement sensor (41) being configured to detect the displacement of a movable part of the first oil cylinder (44) along the first direction (x); and / or The second loading device (8) comprises a second oil cylinder (84) and a second displacement sensor (81), wherein the second oil cylinder (84) is configured to drive the movable seat (92) to reciprocate along the second direction (y), and the second displacement sensor (81) is configured to detect the displacement of the movable part of the second oil cylinder (84) along the second direction (y).

9. The bolt vibration test system according to any one of claims 1 to 7, characterized in that: The loading device comprises a first loading device (4) for applying a vibration load along the first direction (x) to the movable seat (92) and a second loading device (8) for applying a vibration load along the second direction (y), wherein the first loading device (4) is fixed to the movable seat (92) along the first direction (x) and is movably connected to the movable seat (92) along the second direction (y), and the second loading device (8) is fixedly connected to the movable seat (92).

10. The bolt vibration test system according to claim 9, characterized in that: Also includes: a first slide rail (93), wherein the movable seat (92) is movably connected to the fixed seat (91) along the first direction (x) via the first slide rail (93); and / or A slide rail connecting frame (52) and a second slide rail (51) mounted on the slide rail connecting frame (52); one of the movable seat (92) and the first loading device (4) is fixedly connected to the slide rail connecting frame (52); and the other of the movable seat (92) and the first loading device (4) is movably connected to the slide rail connecting frame (52) along the second direction (y) via the second slide rail (51).

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