Dynamic relaxation measuring device for extremely-high-temperature fastening connecting piece

Abstract

The invention relates to a dynamic relaxation measuring device for an extreme high-temperature fastening connecting piece, which comprises a fatigue testing machine, a high-temperature furnace, an upper clamp, a lower clamp, a high-temperature-resistant fastening piece, a high-temperature-resistant stretcher and a pressure sensor, and is characterized in that the upper clamp and the lower clamp are mounted in the high-temperature furnace; the high-temperature-resistant fastener horizontally penetrates through the upper clamp and the lower clamp to form an initial pulling-twisting fastening load, and one end of the high-temperature-resistant fastener extends out of the high-temperature furnace; one end of the high-temperature-resistant stretcher is connected with one end of the high-temperature-resistant fastener, the pressure sensor is mounted at the other end of the high-temperature-resistant stretcher, and the cooling system is mounted on the outer surface of the high-temperature-resistant stretcher; the deviating ends of the upper clamp and the lower clamp are respectively connected with the fatigue testing machine, and the fatigue testing machine fixes the upper clamp and applies a dynamic tension and compression load to the lower clamp. The device is simple in structure and reasonable in design, and is used for measuring the extreme high-temperature dynamic relaxation effect of the fastening connecting piece under the complex tension-torsion-shear dynamic load.

Description

Technical Field

[0001] The present invention relates to the fields of nuclear power, electric power, metallurgy, chemical industry and aerospace technology, and in particular to a dynamic relaxation measuring device for extremely high-temperature fastening connectors. Background Art

[0002] In recent years, domestic and international scholars have systematically studied the loosening behavior of bolted connections using a variety of methods, including theoretical analysis, finite element simulation, and loosening tests. They have also examined the influence of numerous factors on the loosening process of connection structures, accumulating a wealth of literature. In practice, researchers have explored numerous anti-loosening measures, which have demonstrated excellent anti-loosening effects in certain fields. However, in high-temperature equipment connections in fields such as nuclear power, electric power, metallurgy, chemical engineering, and aerospace, as operating temperatures rise to 500-1000°C and design lifespans reach 40 years, with some high-temperature equipment in the core of fourth-generation nuclear power reactors even having a lifespan of 60 years or more, this poses new challenges to the dynamic relaxation and integrity evaluation of high-temperature bolted connections throughout their lifecycle. In particular, there is currently a lack of test instruments and methods for the dynamic relaxation of high-temperature bolted connections in extreme high-temperature environments. Therefore, the invention of a dynamic relaxation test device and method for extreme high-temperature bolted connections has become an urgent issue that needs to be addressed in the relevant high-temperature equipment integrity industry. Summary of the Invention

[0003] The present invention provides a dynamic relaxation measurement device for extremely high temperature fastening connectors, aiming to solve the problems in the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] The dynamic relaxation measuring device of an extreme high temperature fastening connector comprises a fatigue testing machine, a high temperature furnace, a Y-shaped upper clamp, a double Y-shaped lower clamp, a high temperature resistant fastener, a high temperature resistant stretcher and a pressure sensor, wherein the Y-shaped upper clamp and the double Y-shaped lower clamp are installed in the high temperature furnace relative to each other; the high temperature resistant fastener horizontally passes through the opposite ends of the Y-shaped upper clamp and the double Y-shaped lower clamp, and one end thereof extends to the outside of the high temperature furnace; one end of the high temperature resistant stretcher is fixedly connected to one end of the high temperature resistant fastener, and a tensioner is installed between one end of the high temperature resistant stretcher and the high temperature furnace. The other end of the high temperature resistant fastener is provided with a high temperature nut and the washer; the pressure sensor is fixedly mounted on the other end of the high temperature resistant stretcher, and the other end of the high temperature resistant stretcher is also provided with a high temperature resistant reaction cylinder, and the high temperature resistant reaction cylinder is located between the pressure sensor and the other end of the high temperature resistant stretcher; the divergent ends of the Y-shaped upper clamp and the double Y-shaped lower clamp are respectively connected to the fatigue testing machine, and the fatigue testing machine fixes the Y-shaped upper clamp and applies dynamic tensile and compressive loads to the double Y-shaped lower clamp.

[0006] The beneficial effect of the present invention is that during use, by tightening the nut on the right side of the pressure sensor to apply an initial preload, pushing the high-temperature furnace and heating it to above 600°C, the high-temperature fastener begins to loosen, and the pressure sensor can monitor the stress changes in real time, making it easier for people to explore the nonlinear dynamic response characteristics of the fastener under high temperature and tension-shear-torsion composite dynamic excitation and the stress change law of the assembly interface;

[0007] The present invention has a simple structure and reasonable design. It is used to measure the extreme high temperature dynamic relaxation effect of fasteners under complex tension-torsion-shear dynamic loads, and verifies the problem of dynamic relaxation measurement and damage identification integrity of extreme high temperature fasteners.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the high temperature resistant fastener is a high temperature stud, and the high temperature stud is threadedly connected to the opposite ends of the Y-shaped upper clamp and the double Y-shaped lower clamp respectively.

[0010] The beneficial effect of adopting the above further solution is that during use, by tightening the nut on the right side of the pressure sensor to apply an initial preload, pushing the high-temperature furnace to heat above 600°, the high-temperature stud begins to loosen, and the pressure sensor can monitor the stress changes in real time, making it easier for people to explore the nonlinear dynamic response characteristics of fastened joints and the stress change law of the assembly interface under extreme high temperature and tension-shear-torsion combined dynamic excitation;

[0011] Furthermore, one end of the high-temperature stud is threadedly connected to one end of the high-temperature resistant stretcher and the washer, and the other end is threadedly connected to a fixing nut and the washer.

[0012] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and convenient assembly of the high-temperature studs.

[0013] Furthermore, two drive assemblies are installed on the fatigue testing machine, and the two drive assemblies are distributed relatively to each other up and down; the high-temperature furnace is located between the two drive assemblies, and the drive ends of the two drive assemblies pass through the two ends of the high-temperature furnace and are respectively connected to the opposite ends of the Y-shaped upper clamp and the double Y-shaped lower clamp.

[0014] The beneficial effect of adopting the above further solution is simple structure and reasonable design. The driving assembly located below is used to drive the double Y-shaped lower clamp to move downward to pull the high-temperature stud longitudinally.

[0015] Furthermore, the two driving assemblies respectively include a screw rod, and the two screw rods are vertically opposite to each other at the two ends of the high-temperature furnace, and their opposite ends respectively penetrate the two ends of the high-temperature furnace and extend to the divergent ends of the Y-shaped upper clamp and the double Y-shaped lower clamp, and nuts are respectively threaded on them, and the two nuts are respectively fixedly connected to the divergent ends of the Y-shaped upper clamp and the double Y-shaped lower clamp; the upper end of the screw rod located above is fixedly connected to the fatigue testing machine, and the driving assembly located below also includes a motor, which is fixedly installed at the bottom of the fatigue testing machine and its driving end is vertically upward and fixedly connected to the lower end of the screw rod located below.

[0016] The beneficial effect of adopting the above further solution is that during use, the motor is used to drive the screw located below to rotate, and the screw uses its threaded connection with the nut on itself to realize the up and down movement of the nut, thereby realizing the downward movement of the double Y-shaped lower clamp, and then stretching the high-temperature stud.

[0017] Furthermore, a cooler is included, and the cooler is used to cool the high-temperature resistant stretcher.

[0018] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing the cooler to cool the high-temperature resistant stretcher during operation, thereby extending the service life of the high-temperature resistant stretcher.

[0019] Furthermore, the cooler includes a water inlet pipe and a water outlet pipe, and one end of the water inlet pipe and one end of the water outlet pipe are respectively connected to the interior of the high-temperature resistant stretching device.

[0020] The beneficial effect of adopting the above further scheme is simple structure and reasonable design. The cooling water is sent into the high-temperature resistant stretcher by using the water inlet pipe, and the cooling water in the high-temperature resistant stretcher is discharged by using the water outlet pipe to achieve cooling of the high-temperature resistant stretcher.

[0021] Furthermore, the cooler also includes a water pump and a water tank. The water pump is installed in the water tank, and its outlet is connected to the other end of the water inlet pipe; the other end of the water outlet pipe is connected to the water tank.

[0022] The beneficial effect of adopting the above further scheme is that the structure is simple and the design is reasonable. The cooling water in the water tank is sent into the high temperature resistant stretcher through the water inlet pipe by a water pump, and the cooling water in the high temperature resistant stretcher is discharged by the water outlet pipe to achieve the cooling of the high temperature resistant stretcher.

[0023] In addition, a water pump is used to form a cold cycle of cooling water in the water tank and the cooler, so as to realize the recycling of cooling water and save water resources.

[0024] Furthermore, the high temperature resistant stretcher is provided with a plurality of cooling channels inside, and the plurality of cooling channels are connected end to end in sequence; one end of the water inlet pipe and one end of the water outlet pipe are respectively connected to the corresponding ends of two corresponding cooling channels.

[0025] The beneficial effects of adopting the above further solution are simple structure, reasonable design of multiple cooling channels connected end to end in sequence in the high-temperature resistant stretcher, and better cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall assembly of the present invention;

[0027] Figure 2 It is a partial structural schematic diagram of the present invention;

[0028] Figure 3 This is an assembly diagram of the Y-shaped upper clamp, double Y-shaped lower clamp, high-temperature resistant fastener, and high-temperature resistant stretcher in the present invention;

[0029] Figure 4 It is a partial cross-sectional enlarged view of the assembly of the Y-shaped upper clamp, double Y-shaped lower clamp, high-temperature resistant fastener and high-temperature resistant stretcher in the present invention;

[0030] Figure 5 This is an assembly diagram of the Y-shaped upper clamp, double Y-shaped lower clamp, and high-temperature studs in the present invention;

[0031] Figure 6 This is an assembly diagram of the double Y-shaped lower clamp and the screw in the present invention;

[0032] Figure 7 Schematic diagram of the structure of the high temperature resistant stretcher in the present invention;

[0033] Figure 8 This is a schematic structural diagram of the high-temperature resistant reaction cylinder of the present invention;

[0034] Figure 9 It is a structural schematic diagram of the fatigue testing machine in the present invention.

[0035] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0036] 1. Fatigue testing machine; 2. High-temperature furnace; 3. Y-type upper fixture; 4. Double Y-type lower fixture; 5. High-temperature resistant stretcher; 6. Pressure sensor; 7. High-temperature stud; 8. Screw; 9. Motor; 10. Water inlet pipe; 11. Water outlet pipe; 12. High-temperature nut; 13. High-temperature resistant reaction cylinder; 14. Washer. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0041] Example 1

[0042] like Figures 1 to 9As shown, this embodiment provides a dynamic relaxation measuring device for extreme high temperature fasteners, including a fatigue testing machine 1, a high temperature furnace 2, a Y-shaped upper clamp 3, a double Y-shaped lower clamp 4, a high temperature resistant fastener, a high temperature resistant stretcher 5 and a pressure sensor 6, wherein the Y-shaped upper clamp 3 and the double Y-shaped lower clamp 4 are installed in the high temperature furnace 2 relative to each other; the high temperature resistant fastener horizontally passes through the opposite ends of the Y-shaped upper clamp 3 and the double Y-shaped lower clamp 4 to form an initial tension-torsion tightening load, and one end of the high temperature resistant stretcher 5 extends to the outside of the high temperature furnace 2; one end of the high temperature resistant stretcher 5 is fixedly connected to one end of the high temperature resistant fastener, and one end of the high temperature resistant stretcher 5 is fixedly connected to the high temperature furnace 2. A washer 14 is installed between the temperature furnace 2, and a high-temperature nut 12 and a washer 14 are sleeved on the other end of the high-temperature resistant fastener; the pressure sensor 6 is fixedly installed on the other end of the high-temperature resistant tensile device 5, and the other end of the high-temperature resistant tensile device 5 is also sleeved with a high-temperature resistant reaction cylinder 13, and the high-temperature resistant reaction cylinder 13 is located between the pressure sensor 6 and the other end of the high-temperature resistant tensile device 5; the diverging ends of the Y-shaped upper clamp 3 and the double Y-shaped lower clamp 4 are respectively connected to the fatigue testing machine 1, and the fatigue testing machine 1 fixes the Y-shaped upper clamp 3 and applies dynamic tensile and compressive loads to the double Y-shaped lower clamp 4.

[0043] During use, by tightening the nut on the right side of the pressure sensor 6 to apply an initial preload, pushing the high-temperature furnace 2 and heating it to above 600°, the high-temperature resistant fasteners begin to loosen, and the pressure sensor 6 can monitor the stress changes in real time, making it easier for people to explore the nonlinear dynamic response characteristics of fasteners and the stress change laws of the assembly interface under extreme high temperatures and tension-shear-torsion composite dynamic excitations.

[0044] Preferably, in this embodiment, the high temperature furnace 2 as a whole adopts a rectangular box-shaped structure, and the entire furnace adopts a closed structure. Figure 2 In the figure, only part of the structure on the right side of the high-temperature furnace 2 is cut away to show the internal structure of the high-temperature furnace 2.

[0045] Preferably, in this embodiment, the pressure sensor 6 is an annular structure, and is fixedly sleeved on the other end of the high-temperature resistant stretcher 5 .

[0046] In addition, the pressure sensor 6 is preferably a pressure sensor in the prior art.

[0047] Preferably, in this embodiment, the fatigue testing machine adopts a high-temperature electronic creep fatigue testing machine in the prior art.

[0048] It should be noted that the fatigue testing machine 1 , high temperature furnace 2 , high temperature resistant stretcher 5 and pressure sensor 6 respectively adopt existing technologies, and their specific structures and principles are not described in detail here.

[0049] In addition, during the specific test, the other end of the high temperature resistant stretcher 5 needs to be connected to a power source such as a cylinder, and the cylinder provides a stretching force.

[0050] When used, the bolt is placed centrally between the upper double Y-shaped lower clamps. Through the clamping of the clamps, the bolt passes through the clamps horizontally, and the two maintain a shear balance state without interfering with the entire experiment.

[0051] The high temperature resistant tensile device is put on the double Y-shaped lower fixture and has no contact with the right end of the high temperature stud, which does not affect the test.

[0052] After the experiment started, the high-temperature furnace was kept above 600°C. The temperature was lowered to the tolerance range of the pressure sensor through the cooling device, which would not affect the experiment. It was neither too high to burn the pressure sensor, nor too low to ensure the accuracy of the experimental structure.

[0053] This embodiment has a simple structure and reasonable design. It is used to measure the extreme high temperature dynamic relaxation effect of fasteners under complex tension-torsion-shear dynamic loads, and verifies the problem of dynamic relaxation measurement and damage identification integrity of extreme high temperature fasteners.

[0054] Example 2

[0055] On the basis of Example 1, in this embodiment, the high temperature resistant fastener is a high temperature stud 7, and the stud bolt 7 is threadedly connected to the opposite ends of the Y-shaped upper clamp 3 and the double Y-shaped lower clamp 4 respectively.

[0056] During use, by tightening the nut on the right side of the pressure sensor 6 to apply an initial preload, the high-temperature furnace 2 is pushed and heated to above 600°C. The high-temperature stud 7 begins to loosen, and the pressure sensor 6 can monitor the stress changes in real time, making it easier for people to explore the nonlinear dynamic response characteristics of fasteners and the stress change law of the assembly interface under extreme high temperature and tension-shear-torsion combined dynamic excitation;

[0057] Example 3

[0058] On the basis of Example 2, in this embodiment, one end of the high-temperature stud 7 is threadedly connected to one end of the high-temperature resistant tensioner 5 and a washer 14 , and the other end is threadedly connected to a fixing nut and a washer 14 .

[0059] This solution has a simple structure and a reasonable design, and the assembly of the high-temperature stud 7 is relatively convenient.

[0060] Example 4

[0061] On the basis of the above embodiments, in this embodiment, two drive assemblies are installed on the fatigue testing machine 1, and the two drive assemblies are relatively distributed up and down; the high-temperature furnace 2 is located between the two drive assemblies, and the drive ends of the two drive assemblies respectively pass through the two ends of the high-temperature furnace 2 and are respectively connected to the opposite ends of the Y-shaped upper clamp 3 and the double Y-shaped lower clamp 4.

[0062] This solution has a simple structure and a reasonable design. The driving assembly located below is used to drive the double Y-shaped lower clamp 4 to move downward to pull the high-temperature stud 7 longitudinally.

[0063] Example 5

[0064] On the basis of Example 4, in this embodiment, the two driving components respectively include a screw rod 8, and the two screw rods 8 are vertically oppositely distributed at the two ends of the high-temperature furnace 2, and their opposite ends respectively penetrate the two ends of the high-temperature furnace 2 and extend to the divergent ends of the Y-shaped upper clamp 3 and the double Y-shaped lower clamp 4, and nuts are respectively threaded on them, and the two nuts are respectively fixedly connected to the divergent ends of the Y-shaped upper clamp 3 and the double Y-shaped lower clamp 4; the upper end of the screw rod 8 located above is fixedly connected to the fatigue testing machine 1, and the driving component located below also includes a motor 9, which is fixedly installed at the bottom of the fatigue testing machine 1 and its driving end is vertically upward and fixedly connected to the lower end of the screw rod 8 located below.

[0065] During use, the motor 9 is used to drive the screw 8 located below to rotate. The screw 8 uses its threaded connection with the nut on itself to realize the up and down movement of the nut, thereby realizing the downward movement of the double Y-shaped lower clamp 4, and then stretching the high-temperature stud 7.

[0066] Preferably, in this embodiment, the two screws 8 have a length of 70 mm and a diameter of 16 mm.

[0067] Based on the above scheme, the Y-shaped upper clamp 3 includes an upper clamp, which is vertically arranged and fixedly connected to an upper positioning frame at its upper end, and the upper positioning frame is fixedly connected to the nut on the screw 8 located above; the double Y-shaped lower clamp 4 includes two lower clamps, which are respectively vertically arranged and horizontally distributed relative to each other, and their lower ends are respectively fixedly connected to the lower positioning frame, and the lower positioning frame is fixedly connected to the nut on the screw 8 located below; a gap is provided between the upper ends of the two lower clamps, and the lower end of the upper clamp extends between the upper ends of the two lower clamps, and the high-temperature stud 7 passes through the lower end of the upper clamp and the upper ends of the two lower clamps.

[0068] In addition, the Y-shaped upper fixture 3 and the double Y-shaped lower fixture 4 are installed respectively through the upper positioning stand and the lower positioning stand, without generating other loads, while keeping the high-temperature stud and the upper double Y-shaped lower fixture coaxial and concentric without bending moment.

[0069] Example 6

[0070] On the basis of the above embodiments, this embodiment further includes a cooler, which is used to cool the high-temperature resistant stretcher 5 .

[0071] The solution has a simple structure and a reasonable design. The cooler is used to cool the high-temperature resistant stretcher during operation, thereby extending the service life of the high-temperature resistant stretcher.

[0072] Example 7

[0073] On the basis of Example 6, in this embodiment, the cooler includes a water inlet pipe 10 and a water outlet pipe 11, and one end of the water inlet pipe 10 and one end of the water outlet pipe 11 are respectively connected to the interior of the high-temperature resistant stretcher 5.

[0074] This solution has a simple structure and a reasonable design. The cooling water is fed into the high-temperature resistant stretcher 5 by the water inlet pipe 10 and the cooling water in the high-temperature resistant stretcher 5 is discharged by the water outlet pipe 11 to cool the high-temperature resistant stretcher 5.

[0075] Example 8

[0076] On the basis of Example 7, in this embodiment, the cooler further includes a water pump and a water tank. The water pump is installed in the water tank, and the outlet of the water pump is connected to the other end of the water inlet pipe 10.

[0077] This solution has a simple structure and a reasonable design. A water pump is used to deliver the cooling water in the water tank into the high-temperature resistant stretcher 5 through the water inlet pipe 10, and at the same time, the cooling water in the high-temperature resistant stretcher 5 is discharged through the water outlet pipe 11 to achieve cooling of the high-temperature resistant stretcher 5.

[0078] In addition, the other end of the water outlet pipe 11 is connected to the water tank. This solution has a simple structure and a reasonable design. The water pump is used to form a cold cycle in the water tank and the cooler, thereby realizing the recycling of cooling water and saving water resources.

[0079] Example 9

[0080] On the basis of Example 8, in this embodiment, a plurality of cooling channels are provided inside the high-temperature resistant stretcher 5, and the plurality of cooling channels are connected end to end in sequence; one end of the water inlet pipe 10 and one end of the water outlet pipe 11 are respectively connected to the corresponding ends of the corresponding two cooling channels.

[0081] This solution has a simple structure, and the multiple cooling channels in the high-temperature resistant stretcher 5 that are connected end to end are reasonably designed, resulting in a better cooling effect.

[0082] The working principle of the present invention is as follows:

[0083] During use, by tightening the nut on the right side of the pressure sensor 6 to apply an initial preload, the high-temperature furnace 2 is pushed and heated to above 600°C. The high-temperature stud 7 begins to loosen, and the pressure sensor 6 can monitor the stress changes in real time, making it easier for people to explore the nonlinear dynamic response characteristics of fasteners and the stress change law of the assembly interface under extreme high temperature and tension-shear-torsion combined dynamic excitation;

[0084] The beneficial effects of the present invention are as follows:

[0085] The present invention provides a dynamic relaxation measurement device for extremely high-temperature fasteners. By tightening the nut on the right side of the pressure sensor to apply an initial preload, pushing the high-temperature furnace and heating it to above 600°, the bolts begin to loosen. The pressure sensor can then monitor stress changes in real time, making it easier for people to explore the nonlinear dynamic response characteristics of fasteners and the stress change laws of the assembly interface under extreme high temperatures and tension-shear-torsion composite dynamic excitation.

[0086] In summary, the application of the technical solution of the present invention solves the problems in the prior art of being unable to monitor the loosening stress of fastening connectors under complex dynamic loads in real time and being unable to verify damage identification.

[0087] It should be noted that all electronic components involved in the present invention adopt existing technologies, and the above components are electrically connected to the controller, and the control circuits between the controller and the components are existing technologies.

[0088] It will be apparent 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 invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0089] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Dynamic relaxation measurement device for extremely high temperature fastening joints, characterized by: The invention comprises a fatigue testing machine (1), a high-temperature furnace (2), a Y-shaped upper clamp (3), a double Y-shaped lower clamp (4), a high-temperature resistant fastener, a high-temperature resistant stretcher (5) and a pressure sensor (6), wherein the Y-shaped upper clamp (3) and the double Y-shaped lower clamp (4) are installed in the high-temperature furnace (2) in an upper and lower relative manner; the high-temperature resistant fastener horizontally penetrates the opposite ends of the Y-shaped upper clamp (3) and the double Y-shaped lower clamp (4) to form an initial tension-torsion fastening load, and one end of the high-temperature resistant stretcher (5) extends to the outside of the high-temperature furnace (2); one end of the high-temperature resistant stretcher (5) is fixedly connected to one end of the high-temperature resistant fastener, and a gasket (14) is installed between one end of the high-temperature resistant fastener and the high-temperature furnace (2), and the high-temperature resistant fastener is installed in a high-temperature resistant manner. A high-temperature nut (12) and the washer (14) are sleeved on the other end of the high-temperature resistant fastener; the pressure sensor (6) is fixedly mounted on the other end of the high-temperature resistant stretcher (5), and a high-temperature resistant reaction cylinder (13) is also sleeved on the other end of the high-temperature resistant stretcher (5), and the high-temperature resistant reaction cylinder (13) is located between the pressure sensor (6) and the other end of the high-temperature resistant stretcher (5); the diverging ends of the Y-shaped upper clamp (3) and the double Y-shaped lower clamp (4) are respectively connected to the fatigue testing machine (1), and the fatigue testing machine (1) fixes the Y-shaped upper clamp (3) and applies dynamic tensile and compressive loads to the double Y-shaped lower clamp (4).

2. The device for measuring dynamic relaxation of extremely high temperature fastening connectors according to claim 1, characterized in that: The high temperature resistant fastener is a high temperature stud (7), and the high temperature stud (7) is threadedly connected to the opposite ends of the Y-shaped upper clamp (3) and the double Y-shaped lower clamp (4).

3. The extreme high temperature fastening connection dynamic relaxation measurement device according to claim 2, characterized in that: One end of the high-temperature stud (7) is threadedly connected to one end of the high-temperature resistant stretcher (5) and the washer (14), and the other end is threadedly connected to a fixing nut and the washer (14).

4. The extreme high temperature fastening connection dynamic relaxation measurement device according to claim 1, characterized in that: The fatigue testing machine (1) is equipped with two drive assemblies, which are arranged relatively to each other in an upper and lower position; the high-temperature furnace (2) is located between the two drive assemblies, and the drive ends of the two drive assemblies pass through the two ends of the high-temperature furnace (2) and are connected to the opposite ends of the Y-shaped upper clamp (3) and the double Y-shaped lower clamp (4).

5. The extreme high temperature fastening connection dynamic relaxation measurement device according to claim 4, characterized in that: The two driving assemblies respectively include a screw rod (8), and the two screw rods (8) are vertically oppositely distributed at the two ends of the high-temperature furnace (2), and their opposite ends respectively penetrate the two ends of the high-temperature furnace (2) and extend to the diverging ends of the Y-shaped upper clamp (3) and the double Y-shaped lower clamp (4), and nuts are respectively threaded on them. The two nuts are fixedly connected to the diverging ends of the Y-shaped upper clamp (3) and the double Y-shaped lower clamp (4); the upper end of the screw rod (8) located above is fixedly connected to the fatigue testing machine (1), and the driving assembly located below also includes a motor (9), which is fixedly installed at the bottom of the fatigue testing machine (1) and its driving end is vertically upward and fixedly connected to the lower end of the screw rod (8) located below.

6. The device for measuring dynamic relaxation of extremely high temperature fastening connectors according to any one of claims 1 to 5, characterized in that: It also includes a cooler, which is used to cool the high-temperature resistant stretcher (5).

7. The extreme high temperature fastening connection dynamic relaxation measurement device according to claim 6, characterized in that: The cooler comprises a water inlet pipe (10) and a water outlet pipe (11), one end of the water inlet pipe (10) and one end of the water outlet pipe (11) are respectively connected to the interior of the high-temperature resistant stretcher (5).

8. The extreme high temperature fastening connection dynamic relaxation measurement device according to claim 7, characterized in that: The cooler further comprises a water pump and a water tank. The water pump is installed in the water tank, and its outlet is communicated with the other end of the water inlet pipe (10); the other end of the water outlet pipe (11) is communicated with the water tank.

9. The device for measuring dynamic relaxation of extremely high temperature fastening connectors according to claim 8, characterized in that: The high-temperature resistant stretcher (5) is provided with a plurality of cooling channels inside, and the plurality of cooling channels are sequentially connected end to end; one end of the water inlet pipe (10) and one end of the water outlet pipe (11) are respectively connected to the corresponding ends of two corresponding cooling channels.

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