Connecting bolt loosening influence mechanism test device

Abstract

The application belongs to the technical field of bolt connection loosening detection, and provides a connection bolt loosening influence mechanism test device, which comprises a test bench and a testing device arranged in the test bench. The test bench comprises a support frame, and the support frame is respectively provided with mounting plates, a lower cross beam one, side cross beams, a lower cross beam two, connecting plates one and two, vertical beams one and two, a lower cross beam three and vertical beams two. The application can reduce the manufacturing and installation cost of the testing device, thereby greatly saving the test cost. The test bench adopts a whole frame structure, improves the overall stability, has higher bearing capacity, and improves the testing accuracy.

Description

Technical Field

[0001] This invention relates to the field of bolt connection loosening detection technology, specifically to a test device for the mechanism of bolt loosening. Background Technology

[0002] Bolted connections, as a fundamental mechanical fastening solution, are systematically applied in the manufacturing system of mechanical equipment. Through modular design and industrialized production standards, they significantly improve engineering assembly efficiency and reduce life-cycle maintenance costs. Currently, researchers both domestically and internationally have been studying bolt loosening for over 70 years. They have conducted in-depth research not only on the loosening mechanism of bolts but also on the parameters affecting bolt loosening, and optimized the design of bolt loading conditions, structural dimensions, and material properties to reduce bolt loosening. Bolt loosening is difficult to avoid, and once loosened, it inevitably leads to a decrease in structural stiffness. However, why this decrease in stiffness leads to structural failure, or what the direct cause of structural failure is, remains largely unexplored. Therefore, the mechanism by which bolt loosening affects the strength, stiffness, stability, and other mechanical properties of a structure is not fully understood.

[0003] Therefore, in view of the above situation, there is an urgent need to provide a test device for the mechanism of the effect of loose connecting bolts in order to overcome the shortcomings in current practical applications. Summary of the Invention

[0004] The purpose of this invention is to provide a test device for the mechanism of the effects of loose connecting bolts, which aims to solve the problems in the background art.

[0005] The present invention is implemented as follows: a test device for the mechanism of loose connecting bolts includes a test bench and a test device set inside the test bench. The test bench includes a support frame, on which are respectively mounted an mounting plate, a lower crossbeam one, a side crossbeam, a lower crossbeam two, a connecting plate one, a connecting plate two, a vertical beam one, a lower crossbeam three, and a vertical beam two. The mounting plate and the side crossbeam are located on both sides of the support frame. The lower crossbeam one, the lower crossbeam two, and the lower crossbeam three are distributed at the bottom inside the support frame. The connecting plate one and the connecting plate two are distributed at the top inside the support frame. The vertical beam one and the vertical beam two are located outside and inside the support frame, respectively.

[0006] The mounting plate and connecting plate are used to fix different test pieces by bolts;

[0007] Lower crossbeam one, side crossbeam, lower crossbeam two, connecting plate two, and vertical beam one are used to connect the electric cylinder; the output end of the electric cylinder is connected to the test piece.

[0008] The second vertical beam is used to fix the horizontally positioned wire sensor;

[0009] The lower crossbeam three is used for fixing the pull wire sensor in the vertical direction; the pull wires of the pull wire sensors are connected with the test piece respectively.

[0010] As a further scheme of the present application, the test device comprises a connecting lug, a pin shaft one, an electric cylinder one, an electric cylinder two, a pin shaft three and a pull wire sensor, and a test piece three is installed on the mounting plate.

[0011] The connecting lug is fixed on the lower crossbeam one, the electric cylinder one is connected with the connecting lug through the pin shaft one, and the telescopic end of the electric cylinder one is connected with the test piece one through the pin shaft two.

[0012] The pull wire sensor base is fixed on the test bench, and the pull wires of the pull wire sensors are connected with the test piece one.

[0013] As a further scheme of the present application, the test piece one is connected with the mounting plate through bolts.

[0014] As a further scheme of the present application, the mounting axis of the electric cylinder one is perpendicular to the test piece one.

[0015] As a further scheme of the present application, the test device comprises a connecting lug, a pin shaft one, an electric cylinder one, an electric cylinder two, a pin shaft three and a pull wire sensor, and a test piece three is installed on the mounting plate.

[0016] The connecting lug is provided with two, the two connecting lugs are fixed on the side crossbeam and the lower crossbeam two respectively, the electric cylinder one is connected with the connecting lug on the side crossbeam through the pin shaft one, the electric cylinder two is connected with the connecting lug on the lower crossbeam two through the pin shaft one, and the test piece two is connected with the electric cylinder two through the pin shaft three.

[0017] The pull wire sensor is provided with two, the pull wire sensor in the horizontal direction is fixed on the mounting plate, and the pull wire sensor in the vertical direction is fixed on the lower crossbeam two, and the pull wires of the two pull wire sensors are connected with the test piece two respectively.

[0018] As a further scheme of the present application, the test piece two is connected and fixed with the connecting plate one through bolts.

[0019] As a further scheme of the present application, the mounting axis of the electric cylinder two is coaxial with the axis of the test piece two, and the mounting axis of the electric cylinder one is perpendicular to the axis of the test piece two.

[0020] As a further scheme of the present application, the test device comprises a connecting lug, a pin shaft one, an electric cylinder one, an electric cylinder two, a pin shaft three and a pull wire sensor, and a test piece three is installed on the mounting plate.

[0021] The connecting lug is provided with two, two connecting lugs are fixedly installed on the vertical beam one and the connecting plate two, the electric cylinder one is connected with the connecting lug on the vertical beam one through the pin shaft one, the test piece three is connected with the electric cylinder one through the pin shaft three, the electric cylinder two is connected with the connecting lug on the connecting plate two through the pin shaft one, and the test piece three is connected with the electric cylinder two through the pin shaft three.

[0022] The pull wire sensor is provided with two, the pull wire sensor in the horizontal direction is fixed on the vertical beam two, and the pull wire sensor in the vertical direction is fixed on the lower cross beam three, and the pull wires of the two pull wire sensors are connected with the test piece three respectively.

[0023] The test piece three and the mounting plate are fixed through bolts.

[0024] As a further scheme of the application, the electric cylinder one installation axis is perpendicular to the test piece three, so as to realize normal loading along the test piece three, and the electric cylinder two installation axis is parallel to the test piece three, so as to realize horizontal loading along the test piece three.

[0025] As a further scheme of the application, it further includes a slewing mechanism for driving the test bench to rotate, the slewing mechanism comprises:

[0026] A base is provided with a motor and a reducer, and the output end of the reducer is connected with a gear;

[0027] A slewing support outer ring is fixed on the base, and a slewing support inner ring is rotatably installed in the slewing support outer ring, and the gear ring of the slewing support inner ring is engaged with the gear;

[0028] And a support plate is fixedly installed above the slewing support inner ring, and the support plate is fixedly connected with the test bench.

[0029] Compared with the prior art, the application has the following beneficial effects:

[0030] The three sets of test devices of the application share one test bench and one electric cylinder, and the electric cylinder is installed in a rear hinged manner, so that the manufacturing and installation costs of the test device are reduced, the test cost is greatly saved, the overall stability is improved, the bearing capacity is higher, and the test accuracy is improved.

[0031] The electric cylinder of the application is a tension and compression dual-purpose type, can realize tension and compression alternating loading, and is suitable for alternating load working conditions of frequent start and stop of amusement facilities. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative work based on these drawings are within the protection scope of the present application.

[0033] Figure 1 is the axial view of the first set of test devices;

[0034] Figure 2 is the front view of the second set of test devices;

[0035] Figure 3 is the axial view of the second set of test devices;

[0036] Figure 4 is the front view of the third set of test devices;

[0037] Figure 5 is the left view of the third set of test devices;

[0038] Figure 6 is the axial view of the third set of test devices;

[0039] Figure 7 is the schematic view of the first set of test devices and the rotating mechanism.

[0040] In the drawings: 1, test bench, 1-1, mounting plate, 1-2, lower crossbeam one, 1-3, side crossbeam, 1-4, lower crossbeam two, 1-5, connecting plate one, 1-6, connecting plate two, 1-7, vertical beam one, 1-8, lower crossbeam three, 1-9, vertical beam two, 2, connecting lug, 3, pin shaft one, 4, pin shaft two, 5, electric cylinder one, 6, test piece one, 7, electric cylinder two, 8, pin shaft three, 9, test piece two, 10, test piece three, 11, guyed sensor, 12, rotating support outer ring, 13, support plate, 14, rotating support inner ring, 15, gear, 16, motor, 17, speed reducer. DETAILED DESCRIPTION

[0041] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the protection scope of the present application.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application should be understood according to the specific circumstances.

[0044] The present application will be further explained in conjunction with the specific embodiments.

[0045] Please refer to Figures 1-7 The connecting bolt loosening influence mechanism test device provided by the embodiment of the present application, the device comprises a test bench 1, the test bench 1 can be used with three sets of different structure test devices, and the three sets of test devices are further described as follows:

[0046] Embodiment one:

[0047] The first set of test devices comprises: a test bench 1, a connecting lug 2, a pin shaft 1 3, a pin shaft 2 4, an electric cylinder 1 5, a test piece 1 6, and a wire tension sensor 1 1. The test bench 1 comprises a mounting plate 1-1 and a lower cross beam 1-2. The test piece 1 6 is connected to the mounting plate 1-1 by bolts. The connecting lug 2 is fixed on the lower cross beam 1-2, the electric cylinder 1 5 is connected to the connecting lug 2 through the pin shaft 1 3, and the electric cylinder 1 5 is connected to the test piece 1 6 through the pin shaft 2 4. The wire tension sensor 1 1 is fixed on the test bench 1, and the wire is connected to the test piece 1 6.

[0048] The mounting axis of the electric cylinder 1 5 is perpendicular to the test piece 1 6, so as to realize the normal loading along the test piece 1 6, simulate the actual load received by the test piece 1 6. The loading force of the electric cylinder 1 5 is preset in the system, so as to realize the loading of the test piece 1 6, and then the displacement of the test piece 1 6 is measured by the wire tension sensor 1 1.

[0049] Embodiment two:

[0050] The second set of testing device includes: test bench 1, connecting lug 2, pin shaft 1 3, electric cylinder 1 5, electric cylinder 2 7, pin shaft 3 8, test piece 2 9, pull wire sensor 11. Test bench 1 includes side beam 1-3, lower beam 2 1-4 and connecting plate 1 5. The test piece 2 9 is fixed on the connecting plate 1 5 by bolts, the electric cylinder 1 5 is connected with the connecting lug 2 through the pin shaft 1 3, the connecting lug 2 is fixed on the side beam 1-3, and the test piece 2 9 is connected with the electric cylinder 1 5 through the pin shaft 3 8. The electric cylinder 2 7 is connected with the connecting lug 2 through the pin shaft 1 3, the connecting lug 2 is fixed on the lower beam 2 1-4, and the test piece 2 9 is connected with the electric cylinder 2 7 through the pin shaft 3 8. The device has two pull wire sensors 11, the horizontal pull wire sensor 11 is fixed on the mounting plate 1-1, the vertical pull wire sensor 11 is fixed on the lower beam 2 1-4, and the pull wires of the two pull wire sensors 11 are connected with the test piece 2 9 respectively.

[0051] The installation axis of the electric cylinder 2 7 is coaxial with the axis of the test piece 2 9, and the installation axis of the electric cylinder 1 5 is perpendicular to the axis of the test piece 2 9. Therefore, axial and radial loading along the test piece 2 9 is realized, and the actual load received by the test piece 2 9 is simulated. The loading forces of the electric cylinder 1 5 and the electric cylinder 2 7 are respectively preset in the system, the loading of the test piece 2 9 in two directions is realized, and then the displacements of the test piece 2 9 in two directions are measured through the horizontal and vertical pull wire sensors 11.

[0052] Example three:

[0053] The third set of testing device includes: test bench 1, connecting lug 2, pin shaft 1 3, electric cylinder 1 5, electric cylinder 2 7, pin shaft 3 8, test piece 3 10, pull wire sensor 11. The test bench 1 includes connecting plate 2 1-6, vertical beam 1 7, lower beam 3 1-8 and vertical beam 2 1-9. The test piece 3 10 is fixed on the mounting plate 1-1 by bolts, the electric cylinder 1 5 is connected with the connecting lug 2 through the pin shaft 1 3, the connecting lug 2 is fixed on the vertical beam 1 7, and the test piece 3 10 is connected with the electric cylinder 1 5 through the pin shaft 3 8. The electric cylinder 2 7 is connected with the connecting lug 2 through the pin shaft 1 3, the connecting lug 2 is fixed on the connecting plate 2 1-6, and the test piece 3 10 is connected with the electric cylinder 2 7 through the pin shaft 3 8. The device has two pull wire sensors 11, the horizontal pull wire sensor 11 is fixed on the vertical beam 2 1-9, the vertical pull wire sensor 11 is fixed on the lower beam 3 1-8, and the pull wires of the two pull wire sensors 11 are connected with the test piece 3 10 respectively.

[0054] The electric cylinder 5 is installed along the axis perpendicular to the test piece 10, so as to realize the normal loading along the test piece 10, and the electric cylinder 7 is installed along the axis parallel to the test piece 10, so as to realize the horizontal loading along the test piece 10, simulating the actual loading of the test piece 10. The loading forces of the electric cylinder 5 and the electric cylinder 7 are respectively preset in the system, so as to realize the loading of the test piece 10 in two directions, and then the displacement of the test piece 10 in two directions is measured through the horizontal and vertical pull wire sensors 11.

[0055] In the above three embodiments, the test piece 1, the test piece 2 and the test piece 3 can all adopt the actual mechanical structure, and the geometric size is scaled according to the preset proportion.

[0056] Embodiment four:

[0057] Further comprising a rotating mechanism for driving any test bench 1 in embodiments one to three to rotate, the rotating mechanism comprising:

[0058] A base 18, the base 18 is provided with a motor 16 and a speed reducer 17, the output end of the speed reducer 17 is connected with a gear 15;

[0059] A rotating support outer ring 12, the rotating support outer ring 12 is fixed on the base 18, and the rotating support inner ring 14 is rotatably installed in the rotating support outer ring 12, and the gear ring of the rotating support inner ring 14 is engaged with the gear 15;

[0060] And a support plate 13 fixedly installed above the rotating support inner ring 14, the support plate 13 is fixedly connected with the test bench 1.

[0061] In this embodiment, the motor 16 is started after being connected with the power supply, the output shaft of the motor 16 is connected with the input end of the speed reducer 17, so as to realize the speed reduction and torque increase; the output shaft of the speed reducer 17 is connected with a transmission shaft, and then the transmission shaft drives the gear 15 to rotate; the gear 15 is engaged with the rotating support inner ring 14 to drive the rotating support inner ring 14 to rotate, the rotating support outer ring 12 is fixed on the base 18 through a pin, and then the support plate 13 is driven to rotate by the bearing inner ring, and further drives the test bench 1 to rotate. Through the ABAQUS software, the stress condition of the cantilever beam after the bolts at different positions on the installation plate 1-1 are loosened and fall off is simulated, and the most dangerous working condition is analyzed.

[0062] It should be noted that the rotary mechanism is linked with the loading system for linkage control: the rotary mechanism is equipped with an absolute value encoder (resolution 13 bits) for real-time feedback of the rotation angle signal, and when the rotation angle reaches the target value (0° / 30° / 60° / 90°, corresponding to the actual running posture of the amusement facility) and the error is ≤0.5°, the electric cylinder is triggered to start loading; the loading force is adjusted according to the preset curve with the rotation angle, for example, in the large pendulum arm test, the loading force F = 0.5θ + 10 (F is the loading force kN, and θ is the rotation angle °), the load change under the dynamic posture is simulated, and the linkage control response time is ≤0.3s.

[0063] In summary, the working principle of the present application is as follows:

[0064] 1. Test device one: main beam moment load simulation

[0065] The device is used for simulating the main beam structure of the "Disco Turntable", which mainly bears the moment load when working.

[0066] (1) Reference test (100% pre-tightening force): first, the test piece one (6) is fixed on the mounting plate (1-1) through bolts and nuts, and the torque wrench is used to tighten the bolts to the specified pre-tightening torque. Then, the electric cylinder one (5) is started to apply a preset load to the test piece, and the displacement change is accurately recorded by the tension wire sensor (11).

[0067] (2) Pre-tightening force attenuation test: subsequently, the pre-tightening force of the bolts connected to the test piece one (6) is sequentially reduced to 90%, 80%, 70% …… and 10% of the specified value. At each pre-tightening force level, the above loading steps are repeated, that is, the same load is applied by the electric cylinder one (5), and the corresponding displacement change is recorded by the tension wire sensor (11).

[0068] 2. Test devices two and three: composite load simulation of the boom and connecting arm

[0069] The two sets of devices are respectively used for simulating the stress conditions of the boom and connecting arm of the "large pendulum", and these components mainly bear the combined action of tension and moment.

[0070] (1) Test steps: the basic test process is the same as that of the test piece one (6), that is, the bolt pre-tightening force is systematically reduced, and loading and displacement measurement are performed at each level.

[0071] (2) Different from the test device one, the two sets of devices can realize synchronous loading of multiple electric cylinders. According to the requirements of the simulated working conditions, each electric cylinder can apply different loading forces to more realistically reproduce the complex stress state of the boom and connecting arm in actual operation.

[0072] It should be pointed out that the electric cylinder of the application is a tension and compression dual-purpose type, can realize tension-pressure alternating loading, and is suitable for alternating load working conditions of frequent start and stop of amusement facilities; the loading mode is set through a PLC control system, and specific parameters are: loading frequency 2Hz, tension keeping 0.2s→unloading 0.1s→pressure keeping 0.2s→unloading 0.1s, and the cycle is carried out, and the alternating load range can be adjusted according to the type of the test piece (test piece one 5-20kN, test piece two / three 10-30kN).

[0073] In a further specific embodiment, further comprising: a bolt loosening simulation test method; the method simulates bolt loosening according to a 'position classification + progressive loosening' mode: the test piece bolts are divided into three types of root bolts (close to the fixed end), middle bolts (in the middle of the structure) and end bolts (near the free end); the test sequence is in turn single bolt pre-tightening force decay 50%→single bolt complete drop→double bolt pre-tightening force decay 50%→multiple bolt complete drop, and the influence weight of the bolt loosening position and quantity on the structure safety is determined by comparing the structure stiffness and displacement change under different loosening states.

[0074] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A test device for studying the mechanism of loosening of a connecting bolt, comprising a test bench (1), characterized in that, It also includes a testing device set in the test bench (1), the test bench (1) includes a support frame, on which are respectively installed an mounting plate (1-1), a lower crossbeam one (1-2), a side crossbeam (1-3), a lower crossbeam two (1-4), a connecting plate one (1-5), a connecting plate two (1-6), a vertical beam one (1-7), a lower crossbeam three (1-8), and a vertical beam two (1-9). The mounting plate (1-1) and the side crossbeam (1-3) are located on both sides of the support frame, the lower crossbeam one (1-2), the lower crossbeam two (1-4), and the lower crossbeam three (1-8) are distributed at the bottom of the support frame, the connecting plate one (1-5) and the connecting plate two (1-6) are distributed at the top of the support frame, and the vertical beam one (1-7) and the vertical beam two (1-9) are located outside and inside the support frame, respectively. Mounting plate (1-1) and connecting plate 1 (1-5) are used to fix different test pieces by bolts; The lower crossbeam 1 (1-2), side crossbeam (1-3), lower crossbeam 2 (1-4), connecting plate 2 (1-6), and vertical beam 1 (1-7) are used to connect the electric cylinder; the output end of the electric cylinder is connected to the test piece. Vertical beam two (1-9) is used to fix the pull-wire sensor in the horizontal direction; The lower crossbeam three (1-8) is used to fix the pull wire sensor in the vertical direction; the pull wire of the pull wire sensor is connected to the test piece.

2. The bolt loosening mechanism test apparatus according to claim 1, characterized by The testing device includes a connecting ear piece (2), a first pin (3), a second pin (4), an electric cylinder (5), and a pull wire sensor (11), and a test piece (6) is installed on the mounting plate (1-1). The connecting lug (2) is fixed on the lower crossbeam (1-2), the electric cylinder (5) is connected to the connecting lug (2) through the pin (3), and the telescopic end of the electric cylinder (5) is connected to the test piece (6) through the pin (4). The base of the pull-wire sensor (11) is fixed on the test bench (1), and the pull wire of the pull-wire sensor (11) is connected to the test piece (6).

3. The bolt loosening mechanism test apparatus according to claim 2, characterized by The test piece (6) is connected to the mounting plate (1-1) by bolts.

4. The bolt loosening mechanism test apparatus according to claim 2, characterized by The electric cylinder (5) is mounted on an axis perpendicular to the test piece (6).

5. The bolt loosening mechanism test apparatus according to claim 1, characterized by The testing device includes a connecting ear (2), a first pin (3), an electric cylinder (5), a second electric cylinder (7), a third pin (8), and a pull wire sensor (11), and a second test piece (9) is installed on the first connecting plate (1-5); Two connecting lugs (2) are provided. The two connecting lugs (2) are fixed on the side crossbeam (1-3) and the lower crossbeam (1-4) respectively. Electric cylinder one (5) is connected to the connecting lug (2) on the side crossbeam (1-3) through pin one (3). Electric cylinder two (7) is connected to the connecting lug (2) on the lower crossbeam (1-4) through pin one (3). Test piece two (9) is connected to electric cylinder two (7) through pin three (8). The pull wire sensor (11) is provided with two, the horizontal direction pull wire sensor (11) is fixed on the mounting plate (1-1), the vertical direction pull wire sensor (11) is fixed on the lower crossbeam two (1-4), and the pull wire of two pull wire sensors (11) is connected with test piece two (9) respectively.

6. The bolt loosening mechanism test apparatus according to claim 5, wherein The test piece two (9) is fixed by bolt connection between the connecting plate one (1-5).

7. The bolt loosening mechanism test apparatus according to claim 5, wherein The electric cylinder two (7) installation axis is coaxial with the axis of test piece two (9), and the electric cylinder one (5) installation axis is perpendicular to the axis of test piece two (9).

8. The bolt loosening mechanism test apparatus according to claim 1, characterized by The test device includes connecting lug (2), pin shaft one (3), electric cylinder one (5), electric cylinder two (7), pin shaft three (8) and pull wire sensor (11), and test piece three (10) is installed on mounting plate (1-1); The connecting lug (2) is provided with two, and the two connecting lugs (2) are fixedly installed on the vertical beam one (1-7) and the connecting plate two (1-6) respectively, the electric cylinder one (5) is connected with the connecting lug (2) on the vertical beam one (1-7) through the pin shaft one (3), the test piece three (10) is connected with the electric cylinder one (5) through the pin shaft three (8), the electric cylinder two (7) is connected with the connecting lug (2) on the connecting plate two (1-6) through the pin shaft one (3), and the test piece three (10) is connected with the electric cylinder two (7) through the pin shaft three (8); The pull wire sensor (11) is provided with two, the horizontal direction pull wire sensor (11) is fixed on the vertical beam two (1-9), the vertical direction pull wire sensor (11) is fixed on the lower crossbeam three (1-8), and the pull wire of two pull wire sensors (11) is connected with test piece three (10) respectively. The test piece three (10) is fixed by bolt between the mounting plate (1-1).

9. The bolt loosening mechanism test apparatus according to claim 8, wherein The electric cylinder one (5) installation axis is perpendicular to test piece three (10), so as to realize normal loading along test piece three (10), and the electric cylinder two (7) installation axis is parallel to test piece three (10), so as to realize horizontal loading along test piece three (10).

10. The bolt loosening mechanism test apparatus according to claim 1, characterized by It also includes a rotating mechanism for driving the test bench (1) to rotate, and the rotating mechanism comprises: A base (18) is provided with a motor (16) and a speed reducer (17), and the output end of the speed reducer (17) is connected with a gear (15); A rotating support outer ring (12) is fixed on the base (18), and a rotating support inner ring (14) is rotatably installed in the rotating support outer ring (12), and the gear ring of the rotating support inner ring (14) is engaged with the gear (15); And a support plate (13) is fixedly installed above the rotating support inner ring (14), and the support plate (13) is fixedly connected with the test bench (1).

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