Ultrasonic measuring device for axial stress of bolt

Abstract

The utility model relates to the technical field of nondestructive testing, and discloses a bolt axial stress ultrasonic measuring device which comprises a constant-temperature box and an auxiliary mechanism, the outer wall of the top of the constant-temperature box is fixedly connected with a motor, the output end of the motor penetrates through the constant-temperature box and is fixedly connected with a rotating shaft, the output end of the motor is provided with a measuring mechanism, and the measuring mechanism is connected with the auxiliary mechanism. The outer wall of the side, close to the motor, of the constant-temperature box is fixedly connected with a display screen, the outer wall of the constant-temperature box is fixedly connected with a water inlet pipe, before axial stress ultrasonic measurement is conducted on a bolt, the bolt needs to be stably clamped and fixed by means of the clamping mechanism according to different diameters of the bolt, after clamping is completed, the axial direction of the bolt is accurately positioned through the measuring mechanism, and then the axial stress of the bolt is accurately measured. Meanwhile, the water in the constant-temperature box is squeezed through the pressing plate, so that the air content in the constant-temperature box can be effectively reduced, formation and propagation of water waves are avoided, external interference is reduced, and ultrasonic measurement of the axial stress of the bolt is more facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of nondestructive testing, in particular to an ultrasonic measuring device for the axial stress of a bolt. Background Art

[0002] Ultrasonic measurement of bolt axial stress is crucial. In many engineering fields, such as machinery, construction, aerospace, etc., the reliability of bolt connections directly affects the safety of the overall structure. Ultrasonic measurement can accurately obtain the axial stress value and detect stress anomalies caused by improper installation, overload or fatigue in advance.

[0003] A patent application with application number CN202020489290.1 ​​discloses a bolt axial stress testing device based on ultrasonic measurement. The testing device includes a tensile testing machine and a high and low temperature test chamber, as well as a stress measurement system and an ultrasonic measurement system. The stress measurement system includes a strain gauge, a signal acquisition unit and a signal processing unit. The strain gauge is pasted on the screw rod of the bolt to be tested; the detection probe of the ultrasonic measurement system is installed at the end of the bolt to be tested.

[0004] In summary, when ultrasonically measuring the axial stress of bolts, if ultrasonic testing is performed on bolts with different diameters, it will bring many difficulties to the ultrasonic measurement work, and external factors are also very likely to affect the detection results of the bolts. These situations are not conducive to carrying out ultrasonic measurement of the axial stress of bolts.

[0005] To this end, we proposed an ultrasonic measurement device for bolt axial stress. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides an ultrasonic measuring device for bolt axial stress, comprising a thermostatic box and an auxiliary mechanism, wherein a motor is fixedly connected to the top outer wall of the thermostatic box, an output end of the motor passes through the thermostatic box and is fixedly connected to a rotating shaft, a measuring mechanism is provided at the output end of the motor, a display screen is fixedly connected to the outer wall of the thermostatic box on one side close to the motor, a water inlet pipe is fixedly connected to the outer wall of the thermostatic box, a water outlet pipe is fixedly connected to the outer wall of the thermostatic box at one end away from the water inlet pipe, a first fixed block is fixedly connected to the outer wall of the thermostatic box, a first hydraulic rod is fixedly connected to the inner wall of the first fixed block, and the auxiliary mechanism comprises:

[0007] The cam is connected to the second sliding frame by the second telescopic rod, and the second telescopic rod is connected to the second sliding frame by the second telescopic rod.

[0008] According to the above technical solution, the inner wall of the second connecting frame is rotatably connected to a rotating block via a rotating shaft, the outer wall of the second connecting frame is rotatably connected to a connecting rod via a rotating shaft, the inner wall of the connecting rod is rotatably connected to an arc-shaped soft rod via a rotating shaft, and a through hole is opened on the inner wall of the arc-shaped soft rod. When the first telescopic rod pushes the second connecting frame toward one side of the bolt, the arc-shaped soft rod contacts the outer surface of the bolt and deforms, and the arc-shaped soft rod pulls the connecting rods on both sides to flip toward the bolt side, and the connecting rods are used to fix both sides of the bolt.

[0009] According to the above technical solution, a second fixed shaft is fixedly connected to the outer wall of the connecting rod on one side close to the rotating block, an end of the second fixed shaft away from the connecting rod passes through the rotating block and is fixedly connected to a second spring, a side of the second spring close to the connecting rod is fixedly connected to the rotating block, the rotating block is used to flip according to the flipping angle of the connecting rod through the second fixed shaft, and the second spring is used for resetting the connecting rod.

[0010] According to the above technical solution, the clamping mechanism, the force-bearing plate is arranged inside the second sliding frame, the bottom outer wall of the force-bearing plate is fixedly connected with a first connecting shaft, the end of the first connecting shaft away from the force-bearing plate passes through the second sliding frame and is fixedly connected with a first elastic component, and the end of the first elastic component close to the force-bearing plate is fixedly connected to the second sliding frame. When the force-bearing plate slides toward the bottom side of the second sliding frame under the compression of the gravity of the bolt, the first connecting shaft is used to improve the stability of the force-bearing plate during the sliding process, and the first elastic component is used to reset the force-bearing plate.

[0011] The cam is connected to the second end of the support frame by a rotation of the second end face of the second support frame, and the cam is connected to the second support frame by a rotation of the second end face of the second support frame.

[0012] According to the above technical solution, the measuring mechanism includes a first sliding frame slidably connected to a rotating shaft, a second hydraulic rod is fixedly connected to the inner wall of the first sliding frame, a support shaft is fixedly connected to the outer surface of the first sliding frame, an end of the support shaft away from the first sliding frame is fixedly connected to a support block, the inner wall of the support block is fixedly connected to the second hydraulic rod, and the support shaft is used to maintain a horizontal action between the support block and the first sliding frame.

[0013] According to the above technical solution, the output end of the second hydraulic rod is fixedly connected to the first connecting frame, the outer surface of the first connecting frame on a side away from the second hydraulic rod is fixedly connected to an ultrasonic detector, and the end of the first connecting frame away from the ultrasonic detector is fixedly connected to a distance detector, the ultrasonic detector is used to perform ultrasonic detection of the axial stress of the bolt, and the distance detector is used to analyze the distance between the ultrasonic detector and the bolt.

[0014] According to the above technical solution, the outer wall of the first connecting frame on one side close to the first sliding frame is fixedly connected to the first fixed shaft, the end of the first fixed shaft away from the first connecting frame passes through the first sliding frame and is fixedly connected to a connecting block, the inner wall of the connecting block is slidably connected to the support shaft, the end of the connecting block away from the first fixed shaft is fixedly connected to the first spring, the end of the first spring away from the connecting block is fixedly connected to the support block, the first fixed shaft is slidably connected along the outer surface of the support shaft through the connecting block, and the first fixed shaft is used to improve the stability of the first connecting frame when pushed by the second hydraulic rod.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. By setting up an ultrasonic measuring device for the axial stress of bolts, before implementing ultrasonic measurement of the axial stress of bolts, it is necessary to first use a clamping mechanism to clamp and fix the bolts firmly according to their different diameters. After clamping, the axial direction of the bolts is accurately located through the measuring mechanism. At the same time, the pressure plate is used to squeeze the water in the constant temperature box, which will effectively reduce the air content inside the constant temperature box, avoid the formation and propagation of water waves, and thus reduce external interference, which is more conducive to the ultrasonic measurement of the axial stress of bolts.

[0017] 2. By setting up a measuring mechanism, when it is necessary to perform ultrasonic testing on the axial stress of the bolt, the motor causes the first sliding frame to slide vertically along the rotating shaft through the rotating shaft. When the ultrasonic detector moves to the same position as the axial surface of the bolt, the ultrasonic detector performs stress ultrasonic testing on the axial surface of the bolt. At the same time, the distance between the ultrasonic detector and the bolt is detected by the distance detector, and then a reasonable ultrasonic testing result is inferred through the distance, thereby improving the accuracy of the bolt axial stress detection.

[0018] 3. By setting up an auxiliary mechanism, when performing bolt axial stress detection, both sides of the bolt are clamped and fixed by the clamping mechanism, and the second connecting frame is pushed toward one side of the bolt through the first telescopic rod. When the arc-shaped soft rod contacts the bolt, the arc-shaped soft rod squeezes the bolt and deforms to cause the connecting rod rotatably connected to the second connecting frame to flip toward the bolt side. The bolt is squeezed by the arc-shaped soft rod, thereby preventing the bolt from shaking when immersed in the liquid inside the constant temperature box, thereby improving the accuracy of subsequent bolt axial stress detection.

[0019] 4. By setting up a clamping mechanism, when the force-bearing plate slides toward the bottom side of the second sliding frame under the gravity of bolts of different diameters, the force-bearing plate rotates the first rotating rod connected to the inner wall, pulls the second rotating rod to flip toward the bolt side, and the clamping rod connected to the top of the second rotating rod contacts the bolt and flips, and contacts the bolt through the gasket fixedly connected to its inner wall, thereby clamping and fixing the bolts of different diameters to prevent the bolts from shaking during the detection process and affecting the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall front structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the overall front cross-sectional structure of the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of the measuring mechanism of the utility model;

[0024] Figure 4 It is a schematic diagram of the auxiliary mechanism structure of the utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the second connecting frame of the utility model;

[0026] Figure 6 It is a schematic diagram of the auxiliary mechanism and the clamping mechanism structure of the utility model;

[0027] Figure 7 It is a schematic diagram of the structure of the clamping mechanism of the utility model;

[0028] Figure 8 It is an enlarged structural schematic diagram of point A of the utility model.

[0029] In the figure: 1, constant temperature box; 2, water inlet pipe; 3, water outlet pipe; 4, display screen; 5, motor; 6, rotating shaft; 7, first fixed block; 8, first hydraulic rod; 9, measuring mechanism; 901, first sliding frame; 902, second hydraulic rod; 903, support shaft; 904, support block; 905, first connecting frame; 906, ultrasonic detector; 907, distance detector; 908, first fixed shaft; 909, connecting block; 910, first spring; 10, auxiliary mechanism; 101, pressure plate; 102, second fixed block; 103, first telescopic rod; 104, second connecting frame; 105, rotating block; 106, connecting rod; 107, second fixed axis; 108, second spring; 109, arc-shaped soft rod; 1010, through hole; 1011, fixed frame; 1012, second telescopic rod; 1013, second sliding frame; 11, clamping mechanism; 111, force plate; 112, first connecting axis; 113, first elastic component; 114, first rotating rod; 115, second rotating rod; 116, clamping rod; 117, gasket; 118, second connecting axis; 119, second elastic component. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the various embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments described in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] See also Figure 1-Figure 5 , Embodiment 1 of the present utility model: A bolt axial stress ultrasonic measuring device comprises a thermostat 1 and an auxiliary mechanism 10, the thermostat 1 is used to stabilize the water temperature inside it to avoid the influence of water temperature changes on the bolt stress detection results, the top outer wall of the thermostat 1 is fixedly connected with a motor 5, the output end of the motor 5 runs through the thermostat 1 and is fixedly connected with a rotating shaft 6, the output end of the motor 5 is provided with a measuring mechanism 9, the outer wall of the thermostat 1 close to the motor 5 is fixedly connected with a display screen 4, the outer wall of the thermostat 1 is fixedly connected with a water inlet pipe 2, when the bolt is completely immersed in water, the water required inside the thermostat 1 is filled through the water inlet pipe 2, the conditions for the formation and propagation of water waves are reduced, the shaking degree of water will be reduced, and the influence of water waves on the bolt stress detection results is reduced, the outer wall of the thermostat 1 away from the water inlet pipe 2 is fixedly connected with a water outlet pipe 3, the outer wall of the thermostat 1 is fixedly connected with a first fixed block 7, the inner wall of the first fixed block 7 is fixedly connected with a first hydraulic rod 8, the auxiliary mechanism 10 comprises:

[0032] The pressing plate 101 is slidably connected to the inner wall of the thermostatic box 1, the top outer wall of the pressing plate 101 is fixedly connected to the second fixed block 102, the inner wall of the end of the second fixed block 102 away from the pressing plate 101 is fixedly connected to the first hydraulic rod 8, the end of the second fixed block 102 away from the first hydraulic rod 8 is fixedly connected to the first telescopic rod 103, the output end of the first telescopic rod 103 passes through the pressing plate 101 and is fixedly connected to the second connecting frame 104, the outer wall of one side of the pressing plate 101 close to the second connecting frame 104 is fixedly connected to the fixing frame 1011, the inner wall of the fixing frame 1011 is fixedly connected to the second telescopic rod 1012, and the output end of the second telescopic rod 1012 is fixedly connected to the second When the axial stress of the bolt is detected, the sliding frame 1013 is operated with the help of the first fixed block 7 fixed to the outer wall of the thermostatic box 1. The first hydraulic rod 8 fixedly connected to the inner wall of the first fixed block 7 plays a role, driving the pressure plate 101 to move downward along the inner wall of the thermostatic box 1 until the bolt fixed by the clamping mechanism 11 at the bottom of the pressure plate 101 can be completely immersed in the liquid in the thermostatic box 1. At the same time, the second telescopic rod 1012 is used to synchronously push or pull the second sliding frame 1013 on both sides, and the spacing is flexibly adjusted according to the difference in length of the bolts, so as to stably clamp and fix the bolts of different lengths, laying a solid foundation and preparing for the subsequent precise detection of the axial stress of the bolts.

[0033] The inner wall of the second connecting frame 104 is rotatably connected to a rotating block 105 via a rotating shaft, the outer wall of the second connecting frame 104 is rotatably connected to a connecting rod 106 via a rotating shaft, the inner wall of the connecting rod 106 is rotatably connected to an arc-shaped soft rod 109 via a rotating shaft, and a through hole 1010 is provided on the inner wall of the arc-shaped soft rod 109. When the first telescopic rod 103 pushes the second connecting frame 104 toward one side of the bolt, the arc-shaped soft rod 109 is deformed after contacting the outer surface of the bolt, and the arc-shaped soft rod 109 pulls the connecting rods 106 on both sides to flip toward the bolt side. The connecting rod 106 is used to fix both sides of the bolt. When both sides of the bolt are fixed by the clamping mechanism 11, the first telescopic rod 103 is started, and it begins to exert force to push the second connecting frame 104 to move toward the bolt. When the arc-shaped soft rod 109 on the second connecting frame 104 touches the bolt, the arc-shaped soft rod 109 is deformed due to the external force acting on the bolt. The force generated by the deformation prompts the connecting rod 106 connected to it and rotatably connected to the second connecting frame 104 to flip toward the bolt side with the rotating connection as the fulcrum.

[0034] A second fixed shaft 107 is fixedly connected to the outer wall of the connecting rod 106 on one side close to the rotating block 105, and an end of the second fixed shaft 107 away from the connecting rod 106 passes through the rotating block 105 and is fixedly connected to the second spring 108. The second spring 108 is fixedly connected to the rotating block 105 on the side close to the connecting rod 106. The rotating block 105 is used to flip according to the flipping angle of the connecting rod 106 through the second fixed shaft 107. The second spring 108 is used to reset the connecting rod 106. When the arc-shaped soft rod 109 contacts the bolt and deforms, the connecting rod 106 connected thereto begins to flip with the rotating connection with the second connecting frame 104 as the center, and with the help of the transmission action of the second fixed shaft 107, the rotating block 105 is driven to deflect. During this process, the rotating block 105 and the connecting rod 106 are relatively slidably connected, and at the same time, the second spring 108 is stretched under force.

[0035] Example 2: Please refer to Figure 3On the basis of the first embodiment, the measuring mechanism 9 includes a first sliding frame 901 slidably connected to the rotating shaft 6, the inner wall of the first sliding frame 901 is fixedly connected to the second hydraulic rod 902, the outer surface of the first sliding frame 901 is fixedly connected to the support shaft 903, the end of the support shaft 903 away from the first sliding frame 901 is fixedly connected to the support block 904, the inner wall of the support block 904 is fixedly connected to the second hydraulic rod 902, the support shaft 903 is used to maintain a horizontal effect between the support block 904 and the first sliding frame 901, the motor 5 drives the rotating shaft 6 to rotate, so that the first sliding frame 901 slides along the direction perpendicular to the rotating shaft 6, and the first sliding frame 901 is fixedly connected to the support block 904 with the help of the support shaft 903, and the end of the second hydraulic rod 902 away from the first sliding frame 901 is fixed by the support block 904, so as to achieve stability during the movement of the first sliding frame 901 through the second hydraulic rod 902.

[0036] The output end of the second hydraulic rod 902 is fixedly connected to the first connecting frame 905, and the outer surface of the first connecting frame 905 on one side away from the second hydraulic rod 902 is fixedly connected to the ultrasonic detector 906. The end of the first connecting frame 905 away from the ultrasonic detector 906 is fixedly connected to the distance detector 907. When the ultrasonic detection of the axial stress of the bolt is carried out, the motor 5 is started to drive the rotating shaft 6 to rotate, and drive the first sliding frame 901 associated with it to slide in a direction perpendicular to the rotating shaft 6, so as to adjust the position of the ultrasonic detector 906. When the ultrasonic detector 906 moves to the same position as the axial surface of the bolt, the ultrasonic detector 906 immediately operates to emit ultrasonic waves to the axial surface of the bolt and receive feedback signals, so as to realize the detection of the axial stress of the bolt. At the same time, the distance detector 907 works synchronously to detect the distance between the ultrasonic detector 906 and the bolt in real time, so as to accurately control the detection status and related parameters.

[0037] The first connecting frame 905 is fixedly connected to the outer wall of one side close to the first sliding frame 901 with a first fixed shaft 908, and the end of the first fixed shaft 908 away from the first connecting frame 905 passes through the first sliding frame 901 and is fixedly connected to a connecting block 909, the inner wall of the connecting block 909 is slidably connected to the support shaft 903, and the end of the connecting block 909 away from the first fixed shaft 908 is fixedly connected to a first spring 910, and the end of the first spring 910 away from the connecting block 909 is fixedly connected to the support block 904, and the first fixed shaft 908 slides along the outer surface of the support shaft 903 through the connecting block 909. Dynamic connection, the first fixed shaft 908 is used to improve the stability of the first connecting frame 905 when it is pushed by the second hydraulic rod 902. When the second hydraulic rod 902 applies force to push the first connecting frame 905 to move toward the side of the bolt, the first fixed shafts 908 fixed on both sides of the first connecting frame 905 slide along the inner wall of the first sliding frame 901. As the first connecting frame 905 moves, it pulls the connecting block 909 with the help of the first fixed shaft 908, causing the connecting block 909 to slide on the inner wall of the support shaft 903. In this process, the sliding action of the connecting block 909 causes the first spring 910 to be stretched.

[0038] Example 3: Please refer to Figure 6-Figure 8 On the basis of the first embodiment, the clamping mechanism 11 includes a force-bearing plate 111 arranged inside the second sliding frame 1013, the bottom outer wall of the force-bearing plate 111 is fixedly connected to a first connecting shaft 112, one end of the first connecting shaft 112 away from the force-bearing plate 111 passes through the second sliding frame 1013 and is fixedly connected to a first elastic component 113, and one end of the first elastic component 113 close to the force-bearing plate 111 is fixedly connected to the second sliding frame 1013. When the force-bearing plate 111 is squeezed by the gravity of the bolt toward the bottom of the second sliding frame 1013, When sliding sideways, the first connecting shaft 112 is used to improve the stability of the force-bearing plate 111 during the sliding process, and the first elastic component 113 is used to reset the force-bearing plate 111. When the bolt is to be clamped and fixed, the two ends of the bolt are first placed on the force-bearing plates 111 on both sides. At this time, under the action of the bolt's own gravity, the force-bearing plate 111 moves along one side of the bottom of the second sliding frame 1013, and the force-bearing plate 111 slides between the first connecting shaft 112 and the second sliding frame 1013, and stretches the first elastic component 113.

[0039] The outer wall of the second sliding frame 1013 is rotatably connected to the second rotating rod 115 through a rotating shaft, the inner wall of the second rotating rod 115 is rotatably connected to the first rotating rod 114 through a rotating shaft, the end of the first rotating rod 114 away from the second rotating rod 115 is rotatably connected to the force plate 111, the end of the second rotating rod 115 away from the second sliding frame 1013 is rotatably connected to the clamping rod 116 through a rotating shaft, the inner wall of the clamping rod 116 is fixedly connected to a gasket 117, the outer wall of the clamping rod 116 on one side close to the second rotating rod 115 is rotatably connected to a second connecting shaft 118 through a rotating shaft, the end of the second connecting shaft 118 away from the clamping rod 116 passes through the second rotating rod 115 and is fixedly connected to a second elastic component 119, and the end of the second elastic component 119 close to the clamping rod 116 is fixedly connected to the second rotating rod 115 Then, when the force-bearing plate 111 is squeezed by the gravity of the bolt, the second rotating rod 115 is flipped toward the bolt side through the first rotating rod 114. The second rotating rod 115 is used to clamp and fix the outer walls of both sides of the bolt through the clamping rod 116. The gasket 117 is used to reduce the local stress concentration caused by the rigid contact of the bolt. When the force-bearing plate 111 slides toward the bottom side of the second sliding frame 1013 under the gravity of the bolt, the force-bearing plate 111 pulls the second rotating rod 115 to flip toward the bolt side through the first rotating rod 114 connected to the inner wall, and the clamping rod 116 connected to the top of the second rotating rod 115 contacts the bolt and flips over, and contacts the bolt through the gasket 117 fixedly connected to its inner wall, thereby clamping and fixing the bolt.

[0040] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view. The scope of the present invention is defined by the appended claims, rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An ultrasonic measuring device for bolt axial stress, comprising a thermostatic box (1) and an auxiliary mechanism (10), wherein a motor (5) is fixedly connected to the top outer wall of the thermostatic box (1), an output end of the motor (5) passes through the thermostatic box (1) and is fixedly connected to a rotating shaft (6), a measuring mechanism (9) is arranged at the output end of the motor (5), a first fixed block (7) is fixedly connected to the outer wall of the thermostatic box (1), a first hydraulic rod (8) is fixedly connected to the inner wall of the first fixed block (7), and the device is characterized in that: The auxiliary mechanism (10) comprises: A pressing plate (101), the pressing plate (101) being slidably connected to the inner wall of the thermostatic box (1), a second fixing block (102) being fixedly connected to the top outer wall of the pressing plate (101), an inner wall of one end of the second fixing block (102) away from the pressing plate (101) being fixedly connected to the first hydraulic rod (8), an end of the second fixing block (102) away from the first hydraulic rod (8) being fixedly connected to a first telescopic rod (103), an output end of the first telescopic rod (103) passing through the pressing plate (101) and being fixedly connected to a second connecting frame (104), an outer wall of one side of the pressing plate (101) close to the second connecting frame (104) being fixedly connected to a fixing frame (1011), an inner wall of the fixing frame (1011) being fixedly connected to a second telescopic rod (1012), and the second telescopic rod (101 The output end of the second connecting frame (1013) is fixedly connected to a second sliding frame (1013), a clamping mechanism (11) is arranged inside the second sliding frame (1013), the inner wall of the second connecting frame (104) is rotatably connected to a rotating block (105) via a rotating shaft, the outer wall of the second connecting frame (104) is rotatably connected to a connecting rod (106) via a rotating shaft, the outer wall of the second sliding frame (1013) is rotatably connected to a second rotating rod (115) via a rotating shaft, the inner wall of the second rotating rod (115) is rotatably connected to a first rotating rod (114) via a rotating shaft, one end of the first rotating rod (114) away from the second rotating rod (115) is rotatably connected to a force bearing plate (111), and one end of the second rotating rod (115) away from the second sliding frame (1013) is rotatably connected to a clamping rod (116) via a rotating shaft.

2. The ultrasonic measuring device for bolt axial stress according to claim 1, characterized in that: The inner wall of the connecting rod (106) is rotatably connected to an arc-shaped soft rod (109) via a rotating shaft, and a through hole (1010) is formed on the inner wall of the arc-shaped soft rod (109).

3. The ultrasonic measuring device for bolt axial stress according to claim 2, characterized in that: A second fixed shaft (107) is fixedly connected to an outer wall of one side of the connecting rod (106) close to the rotating block (105); an end of the second fixed shaft (107) away from the connecting rod (106) passes through the rotating block (105) and is fixedly connected to a second spring (108); and a side of the second spring (108) close to the connecting rod (106) is fixedly connected to the rotating block (105).

4. The ultrasonic measuring device for bolt axial stress according to claim 1, characterized in that: The force-bearing plate (111) is arranged inside the second sliding frame (1013); the bottom outer wall of the force-bearing plate (111) is fixedly connected to a first connecting shaft (112); one end of the first connecting shaft (112) away from the force-bearing plate (111) passes through the second sliding frame (1013) and is fixedly connected to a first elastic component (113); one end of the first elastic component (113) close to the force-bearing plate (111) is fixedly connected to the second sliding frame (1013).

5. The ultrasonic measuring device for bolt axial stress according to claim 4, characterized in that: The inner wall of the clamping rod (116) is fixedly connected to a gasket (117); the outer wall of the clamping rod (116) on one side close to the second rotating rod (115) is connected to a second connecting shaft (118) via a rotating shaft; one end of the second connecting shaft (118) away from the clamping rod (116) passes through the second rotating rod (115) and is fixedly connected to a second elastic component (119); one end of the second elastic component (119) close to the clamping rod (116) is fixedly connected to the second rotating rod (115); the gasket (117) is used to reduce stress concentration caused by rigid contact between the bolt and the clamping rod (116).

6. The ultrasonic measuring device for bolt axial stress according to claim 1, characterized in that: The measuring mechanism (9) comprises a first sliding frame (901) slidably connected to the rotating shaft (6); a second hydraulic rod (902) is fixedly connected to the inner wall of the first sliding frame (901); a support shaft (903) is fixedly connected to the outer surface of the first sliding frame (901); and an end of the support shaft (903) away from the first sliding frame (901) is fixedly connected to a support block (904).

7. The ultrasonic measuring device for bolt axial stress according to claim 6, characterized in that: The output end of the second hydraulic rod (902) is fixedly connected to a first connecting frame (905), an outer surface of a side of the first connecting frame (905) away from the second hydraulic rod (902) is fixedly connected to an ultrasonic detector (906), and an end of the first connecting frame (905) away from the ultrasonic detector (906) is fixedly connected to a distance detector (907).

8. The ultrasonic measuring device for bolt axial stress according to claim 7, characterized in that: A first fixed shaft (908) is fixedly connected to an outer wall of one side of the first connecting frame (905) close to the first sliding frame (901), and an end of the first fixed shaft (908) away from the first connecting frame (905) passes through the first sliding frame (901) and is fixedly connected to a connecting block (909).

9. The ultrasonic measuring device for bolt axial stress according to claim 8, characterized in that: The inner wall of the connecting block (909) is slidably connected to the support shaft (903); one end of the connecting block (909) away from the first fixed shaft (908) is fixedly connected to a first spring (910); one end of the first spring (910) away from the connecting block (909) is fixedly connected to the support block (904); and the first fixed shaft (908) is slidably connected along the outer surface of the support shaft (903) via the connecting block (909).

10. The ultrasonic measuring device for bolt axial stress according to claim 1, characterized in that: A display screen (4) is fixedly connected to an outer wall of the thermostatic box (1) on one side close to the motor (5), a water inlet pipe (2) is fixedly connected to an outer wall of the thermostatic box (1), and a water outlet pipe (3) is fixedly connected to an outer wall of an end of the thermostatic box (1) away from the water inlet pipe (2).

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