Connecting device for multi-axial fatigue test of tube plate welding joint

Abstract

The invention discloses a connecting device for a multi-axial fatigue test of a tube plate welding part, and relates to the technical field of connecting devices. The connecting device is used for connecting a tube plate welding piece and a fatigue testing machine, the tube plate welding piece comprises a welding pipe and two welding plates, the welding pipe is connected between the two welding plates, the connecting device comprises two connecting mechanisms, the two connecting mechanisms are arranged at the ends, away from each other, of the two welding plates respectively, and the connecting mechanisms are connected with the welding pipe. Each connecting mechanism is detachably connected with an adjacent welding part, and one end, far away from the welding plate, of each connecting mechanism is rotationally connected with the fatigue testing machine. The connecting device for the multi-axial fatigue test of the tube plate welding joint can be detached from the tube plate welding piece, the tube plate welding piece cannot be damaged, the integrity of the tube plate welding piece and the connecting mechanism after the fatigue test is guaranteed, the cost of the multi-axial fatigue test of the tube plate welding piece test piece is reduced, and meanwhile, the connecting device can be detached from the tube plate welding piece without damaging the tube plate welding piece. And the processing cost of the test piece of the tube plate welding piece is reduced.

Description

Technical Field

[0001] This invention relates to the field of connection device technology, and more specifically to a connection device for multiaxial fatigue testing of tube sheet welded components. Background Technology

[0002] Tube sheet welded structures are critical load-bearing components in pressure equipment such as boilers, heat exchangers, nuclear power plant steam generators, and chemical containers. During service, they are subjected to alternating loads from cyclic temperature, pressure, and fluid-induced vibrations, making them highly susceptible to fatigue crack initiation in the weld joint area, ultimately leading to catastrophic failure. Therefore, conducting high-precision fatigue performance tests on tube sheet welded specimens in a laboratory environment is of paramount importance for assessing structural reliability, optimizing welding processes, and guiding safe operation and maintenance.

[0003] However, in current fatigue testing practices, welded parts and clamping ends are usually machined as a single unit, making it impossible to disassemble and replace the connecting device separately, which greatly increases the cost of specimen processing. Therefore, how to reliably install tube sheet welded specimens onto a general-purpose fatigue testing machine has always been a significant technical bottleneck and challenge. Summary of the Invention

[0004] In view of this, the present invention provides a connection device for multiaxial fatigue testing of tube sheet welded joints, which can be disassembled from the tube sheet welded component without causing damage to the tube sheet welded component. To achieve the above objective, the present invention adopts the following technical solution: This invention provides a connection device for multiaxial fatigue testing of tube sheet welded joints, used to connect tube sheet welded components to a fatigue testing machine. The tube sheet welded component includes a welded tube and two welded plates, with the welded tube connected between the two welded plates. The device is characterized by including: a connection mechanism, of which two mechanisms are provided, each located at a distance from one end of the two welded plates. Each connection mechanism is detachably connected to one of the adjacent welded components, and the end of the connection mechanism away from the welded plate is rotatably connected to the fatigue testing machine.

[0005] Furthermore, the connecting mechanism includes a pressure equalizing plate, two transverse slide rails, four transverse displacement components, and four transverse baffles. The two transverse slide rails are each connected to one end of the pressure equalizing plate near the welding plate. The two transverse slide rails are respectively disposed on both sides of the welding plate and extend laterally along the pressure equalizing plate. Two transverse displacement components are slidably connected to each transverse slide rail, and a transverse baffle is connected to each transverse displacement component. The transverse baffles extend longitudinally along the pressure equalizing plate. The two transverse displacement components on the same transverse slide rail are located on both sides of the transverse direction of the welding plate.

[0006] Furthermore, the lateral displacement assembly includes a lateral slider and a support plate. The lateral slider is slidably connected to the lateral slide rail. A lateral connecting plate is connected to the end of the lateral slide rail away from the pressure equalizing plate. A laterally extending strip hole is provided on the lateral connecting plate. A through hole is provided at the end of the lateral slider away from the lateral slide rail. The lateral connecting plate and the lateral slider are connected by bolts. The support plate is connected to the side of the lateral slider near the welded pipe. The support plate contacts the end of the welding plate near the welded pipe. A lateral baffle is connected to the support plate, and the support plate and the lateral baffle are perpendicular to each other.

[0007] Furthermore, the connecting mechanism also includes a longitudinal baffle, the transverse baffle is provided with a longitudinally extending strip hole, a longitudinal connecting plate is connected to one side of the longitudinal baffle, the longitudinal connecting plate is provided with a through hole, the longitudinal connecting plate is arranged parallel to the transverse baffle, the longitudinal baffle is arranged perpendicular to the transverse baffle and extends towards the welding plate, and the longitudinal connecting plate and the transverse baffle are connected by bolts.

[0008] Furthermore, the connecting mechanism also includes four axial connecting plates. Each end of the transverse slide rail is provided with a baffle plate along its length. Each axial connecting plate is located on the side of the baffle plate away from the transverse slide rail and is connected to the end of the pressure equalizing plate near the welding plate. The axial connecting plate is provided with a strip-shaped hole extending along the axial direction of the welding pipe. The baffle plate is provided with a through hole, and a bolt is fixed in the through hole. The baffle plate and an adjacent axial connecting plate are connected by bolts.

[0009] Furthermore, a connecting rod is provided at the end of the pressure equalizing plate away from the welding plate, the connecting rod is connected to the pressure equalizing plate by a ball joint, and the end of the connecting rod away from the pressure equalizing plate is connected to the fatigue testing machine.

[0010] Furthermore, a pressure sensor is connected to the end of the connecting rod away from the pressure equalizing plate, and the end of the pressure sensor away from the pressure equalizing plate is connected to the fatigue testing machine.

[0011] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a connection device for multiaxial fatigue testing of tube sheet welded joints. Through the rotational connection between the connection mechanism and the fatigue testing machine, the connection mechanism and the welded plate are fully fitted, while avoiding the generation of large additional stress at the connection weld. Through the detachable connection between the connection mechanism and the tube sheet welded part, the integrity of the tube sheet welded part and the connection mechanism is ensured after the fatigue test, so that the connection mechanism can be used for the fatigue test of the next tube sheet welded part. This reduces the cost of multiaxial fatigue testing of tube sheet welded part specimens. At the same time, there is no need to process the connection device on the tube sheet welded part specimen, thus reducing the processing cost of the tube sheet welded part specimen. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the connection device for multiaxial fatigue testing of tube sheet weld joints provided by the present invention. Figure 2 A side view of the connection device for multiaxial fatigue testing of tube sheet welded joints provided by the present invention; Figure 3 This is a schematic diagram of the internal structure of the transverse slide rail of the connection device for multiaxial fatigue testing of tube sheet welded joints provided by the present invention. Figure 4 This is a partial structural schematic diagram of the connection mechanism of the connection device for multiaxial fatigue testing of tube sheet welded joints provided by the present invention. Figure 5 This is a schematic diagram of the connection mechanism of the connection device for multiaxial fatigue testing of tube sheet welded joints provided by the present invention.

[0014] In the diagram: 1. Welding plate; 2. Welding pipe; 3. Pressure equalizing plate; 4. Transverse connecting plate; 5. Connecting rod; 6. Pressure sensor; 7. Transverse slide rail; 8. Transverse baffle; 9. Axial connecting plate; 10. Transverse slider; 11. Support plate; 12. Longitudinal baffle; 13. Barrier plate; 14. Longitudinal connecting plate. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] See Figure 1-5 This invention discloses a connection device for multiaxial fatigue testing of tube sheet welded joints, used to connect tube sheet welded parts to a fatigue testing machine. The tube sheet welded parts include a welded tube 2 and two welded plates 1. The welded tube 2 is connected between the two welded plates 1. The device includes a connection mechanism, of which two are provided. The two connection mechanisms are respectively located at the ends of the two welded plates 1 that are far apart from each other. Each connection mechanism is detachably connected to one of the adjacent welded parts. The end of the connection mechanism that is far away from the welded plate 1 is rotatably connected to the fatigue testing machine.

[0017] The tube sheet welded specimen is placed between two connecting mechanisms, and the multiaxial fatigue testing machine applies pressure to the tube sheet welded specimen through the connecting mechanisms to complete the compression fatigue test of the tube sheet welded specimen.

[0018] Two welding plates 1 are detachably connected to two connecting mechanisms respectively. The ends of the two connecting mechanisms away from the tube sheet welded parts are connected to a fatigue testing machine. Multiaxial fatigue tests are performed on the tube sheet welded parts specimen. After the test is completed, the tube sheet welded parts specimen is removed from the connecting mechanism to ensure the integrity of the tube sheet welded parts specimen. At this time, the connecting device can be used for multiaxial fatigue testing of another tube sheet welded parts specimen. At the same time, the tube sheet welded parts specimen can be used for the next test, saving the cost of multiaxial fatigue testing of the tube sheet welded parts specimen. In addition, when processing the tube sheet welded parts specimen, it is not necessary to directly process the connecting device on the tube sheet welded parts specimen, saving processing costs.

[0019] In some embodiments, the connecting mechanism includes a pressure equalizing plate 3, two transverse slide rails 7, four transverse displacement components, and four transverse baffles 8. The two transverse slide rails 7 are each connected to one end of the pressure equalizing plate 3 near the welding plate 1. The two transverse slide rails 7 are respectively disposed on both sides of the welding plate 1 and extend laterally along the pressure equalizing plate 3. Two transverse displacement components are slidably connected on each transverse slide rail 7. A transverse baffle 8 is connected to each transverse displacement component. The transverse baffles 8 extend longitudinally along the pressure equalizing plate 3. The two transverse displacement components on the same transverse slide rail 7 are located on both sides of the transverse direction of the welding plate 1.

[0020] The tube sheet welded specimen is placed between the two connecting mechanisms. The transverse displacement component is pushed away from the tube sheet welded specimen, which causes the transverse baffle 8 to move away from the tube sheet welded specimen. This avoids the transverse displacement component and the transverse baffle 8 from affecting the test results. The tube sheet welded specimen is subjected to axial compression fatigue test by a multiaxial fatigue testing machine. The pressure of the multiaxial fatigue testing machine is evenly applied to the welding plate 1 by the pressure equalizing plate 3 to ensure the accuracy of the test results.

[0021] During the process of connecting the connecting mechanism with the tube sheet welded specimen, the transverse displacement component is pushed so that it slides within the transverse slide rail 7, thereby driving the transverse baffle 8 to move closer to the tube sheet welded specimen, so that the transverse baffle 8 abuts against the side wall of the welded plate 1. The welded plate 1 is clamped by the transverse displacement component and the transverse baffle 8 to ensure the stability of the clamping of the welded plate 1. Multiaxial fatigue testing is then performed on the tube sheet welded specimen using a multiaxial fatigue testing machine.

[0022] In some embodiments, the lateral displacement assembly includes a lateral slider 10 and a support plate 11. The lateral slider 10 is slidably connected to a lateral slide rail 7. A lateral connecting plate 4 is connected to one end of the lateral slide rail 7 away from the pressure equalizing plate 3. A laterally extending strip hole is provided on the lateral connecting plate 4. A through hole is provided at one end of the lateral slider 10 away from the lateral slide rail 7. The lateral connecting plate 4 and the lateral slider 10 are connected by bolts. The support plate 11 is connected to the side of the lateral slider 10 near the welding pipe 2. The support plate 11 contacts the end of the welding plate 1 near the welding pipe 2. A lateral baffle 8 is connected to the support plate 11, and the support plate 11 and the lateral baffle 8 are perpendicular to each other.

[0023] When using the connecting mechanism to clamp the tube sheet welded specimen, push the transverse slider 10. The transverse slider 10 drives the support plate 11 and the transverse baffle 8 to move closer to the welding plate 1 until the support plate 11 contacts the end of the welding plate 1 near the welded tube 2 and the transverse baffle 8 contacts the side wall of the welding plate 1. Stop pushing the transverse slider 10. Connect the transverse connecting plate 4 and the transverse slider 10 with bolts to fix the transverse baffle 8 and the support plate 11. When performing axial tensile fatigue tests on the tube sheet welded specimen, the multi-axis fatigue testing machine stretches the tube sheet welded specimen through the support plate 11. The cooperation between the support plate 11 and the transverse baffle 8 prevents the transverse movement of the tube sheet welded specimen, ensuring the accuracy of the test results.

[0024] During the adjustment of the transverse baffle 8, the position of the transverse slider 10 is changed by pushing the transverse slider 10 to slide on the transverse slide rail 7. By setting a strip hole on the transverse connecting plate 4, the transverse slider 10 can be connected to different positions of the transverse connecting plate 4, thereby fixing the support plate 11 and the transverse baffle 8 in different positions, ensuring the clamping of welding plates of various sizes and expanding the application range of the connecting device.

[0025] In some embodiments, the connecting mechanism further includes a longitudinal baffle 12, a transverse baffle 8 having a longitudinally extending strip hole, a longitudinal connecting plate 14 connected to one side of the longitudinal baffle 12, a through hole being provided on the longitudinal connecting plate 14, the longitudinal connecting plate 14 being arranged parallel to the transverse baffle 8, the longitudinal baffle 12 being arranged perpendicular to the transverse baffle 8 and extending toward the welding plate 1, and the longitudinal connecting plate 14 and the transverse baffle 8 being connected by bolts.

[0026] After the position adjustment of the transverse baffle 8 is completed, the longitudinal baffle 12 is pushed to move closer to the welding plate 1, so that the bolt slides in the strip hole of the transverse baffle 8. When the longitudinal baffle 12 contacts the side wall of the welding plate 1, the longitudinal connecting plate 14 and the transverse baffle 8 are connected by the cooperation of the bolt and nut, thereby realizing the positioning of the longitudinal baffle 12. The longitudinal baffle 12 prevents the welding plate 1 from sliding longitudinally, ensuring the stability of the tube sheet welded specimen during the multiaxial fatigue test.

[0027] By providing strip-shaped holes on the transverse baffle 8, the longitudinal connecting plate 14 can be connected to different positions on the transverse baffle 8, enabling the connecting mechanism to stably clamp welding plates 1 of various sizes.

[0028] In some embodiments, the connecting mechanism further includes four axial connecting plates 9. Each end of the transverse slide rail 7 along its length is provided with a baffle plate 13. Each axial connecting plate 9 is located on the side of a baffle plate 13 away from the transverse slide rail 7 and is connected to the end of the pressure equalizing plate 3 near the welding plate 1. The axial connecting plate 9 is provided with a strip-shaped hole extending axially along the welding pipe 2. The baffle plate 13 is provided with a through hole, and a bolt is fixed in the through hole. The baffle plate 13 and an adjacent axial connecting plate 9 are connected by bolts. The transverse slide rail 7 is connected to the pressure equalizing plate 3 through the baffle plate 13 and the axial connecting plate 9.

[0029] When connecting the tube sheet weldment to the connecting mechanism, slide the transverse slider 10 to move the support plate 11 to the side of the welding plate 1 closer to the welding tube 2, push the baffle 13, thereby driving the transverse slide rail 7 to move up and down, thereby driving the transverse slider 10, support plate 11 and transverse baffle 8 to move up and down until the support plate 11 contacts the welding plate 1. Lock the baffle 13 and the axial connecting plate 9 by the cooperation of bolts and nuts. Loosen the bolts and nuts on the transverse connecting plate 4, readjust the position of the transverse baffle 8 so that the transverse baffle 8 fits against the welding plate 1, and lock the transverse connecting plate 4 and transverse slider 10 again with bolts and nuts. Push the longitudinal baffle 12 so that the longitudinal baffle 12 contacts the welding plate 1. Connect the longitudinal connecting plate 14 and the transverse baffle 8 with bolts and nuts to fix the longitudinal baffle 12, so that the corner of the welding plate 1 is located in the area enclosed by the support plate 11, the transverse baffle 8 and the longitudinal baffle 12, thereby achieving multi-directional positioning of the tube sheet weldment specimen.

[0030] In some embodiments, a connecting rod 5 is provided at the end of the pressure equalizing plate 3 away from the welding plate 1. The connecting rod 5 is connected to the pressure equalizing plate 3 by a ball joint, and the end of the connecting rod 5 away from the pressure equalizing plate 3 is connected to the fatigue testing machine.

[0031] By connecting the connecting rod 5 to the pressure equalizing plate 3 via a ball joint, the pressure equalizing plate 3 can fit onto the welding plate 1 according to the slope of the welding plate 1, thereby changing the angle between the connecting rod 5 and the pressure equalizing plate 3, ensuring the degree of fit between the pressure equalizing plate 3 and the welding plate 1, and avoiding additional stress on the tube sheet welding specimen.

[0032] In some embodiments, a pressure sensor 6 is connected to the end of the connecting rod 5 away from the pressure equalizing plate 3, and the end of the pressure sensor 6 away from the pressure equalizing plate 3 is connected to the fatigue testing machine.

[0033] The pressure applied by the multiaxial fatigue testing machine is measured using pressure sensor 6.

[0034] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A connection device for multiaxial fatigue testing of tube sheet welded joints, used to connect the tube sheet welded component to a fatigue testing machine, wherein the tube sheet welded component includes a welded tube and two welded plates, the welded tube being connected between the two welded plates, characterized in that, include: The connection mechanism is provided in two parts, which are respectively located at the ends of the two welding plates that are far apart from each other. Each connection mechanism is detachably connected to one of the adjacent welding parts. The end of the connection mechanism that is far away from the welding plate is rotatably connected to the fatigue testing machine.

2. The connection device for multiaxial fatigue testing of tube sheet welded joints according to claim 1, characterized in that, The connecting mechanism includes a pressure equalizing plate, two transverse slide rails, four transverse displacement components, and four transverse baffles. The two transverse slide rails are each connected to one end of the pressure equalizing plate near the welding plate. The two transverse slide rails are respectively disposed on both sides of the welding plate and extend laterally along the pressure equalizing plate. Two transverse displacement components are slidably connected to each transverse slide rail. A transverse baffle is connected to each transverse displacement component. The transverse baffles extend longitudinally along the pressure equalizing plate. The two transverse displacement components on the same transverse slide rail are located on both sides of the transverse direction of the welding plate.

3. The connection device for multiaxial fatigue testing of tube sheet welded joints according to claim 2, characterized in that, The lateral displacement assembly includes a lateral slider and a support plate. The lateral slider is slidably connected to the lateral slide rail. A lateral connecting plate is connected to the end of the lateral slide rail away from the pressure equalizing plate. A laterally extending strip hole is provided on the lateral connecting plate. A through hole is provided at the end of the lateral slider away from the lateral slide rail. The lateral connecting plate and the lateral slider are connected by bolts. The support plate is connected to the side of the lateral slider near the welded pipe. The support plate contacts the end of the welded plate near the welded pipe. A lateral baffle is connected to the support plate, and the support plate and the lateral baffle are perpendicular to each other.

4. The connection device for multiaxial fatigue testing of tube sheet welded joints according to claim 2, characterized in that, The connecting mechanism further includes a longitudinal baffle, and the transverse baffle is provided with a longitudinally extending strip hole. A longitudinal connecting plate is connected to one side of the longitudinal baffle, and the longitudinal connecting plate is provided with a through hole. The longitudinal connecting plate is arranged parallel to the transverse baffle. The longitudinal baffle is arranged perpendicular to the transverse baffle and extends towards the welding plate. The longitudinal connecting plate and the transverse baffle are connected by bolts.

5. The connection device for multiaxial fatigue testing of tube sheet welded joints according to claim 3, characterized in that, The connecting mechanism further includes four axial connecting plates. Each end of the transverse slide rail is provided with a baffle plate. Each axial connecting plate is located on the side of the baffle plate away from the transverse slide rail and is connected to the end of the pressure equalizing plate near the welding plate. The axial connecting plate is provided with a strip-shaped hole extending along the axial direction of the welding pipe. The baffle plate is provided with a through hole, and a bolt is fixed in the through hole. The baffle plate and an adjacent axial connecting plate are connected by bolts.

6. The connection device for multiaxial fatigue testing of tube sheet welded joints according to claim 2, characterized in that, A connecting rod is provided at the end of the pressure equalizing plate away from the welding plate. The connecting rod is connected to the pressure equalizing plate by a ball joint. The end of the connecting rod away from the pressure equalizing plate is connected to the fatigue testing machine.

7. The connection device for multiaxial fatigue testing of tube sheet welded joints according to claim 6, characterized in that, A pressure sensor is connected to the end of the connecting rod away from the pressure equalizing plate, and the end of the pressure sensor away from the pressure equalizing plate is connected to the fatigue testing machine.

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