Wire fixing device and method for reactor flow-induced vibration test

Abstract

The invention provides a wire fixing device and method for a reactor flow-induced vibration test, the device comprises a wire cover plate and at least one wire pressing plate, one side of the wire cover plate is provided with an opening and is provided with an accommodating cavity, the opening end of the wire cover plate is connected with the outer wall of a hanging basket cylinder, and a sensor wire is arranged in the accommodating cavity and is connected with the wire pressing plate. A round hole is formed in the middle of the wire cover plate, at least one long hole is formed in each of the two sides of the round hole in the length extending direction of the wire cover plate, and the wire cover plate penetrates through the round hole or the long holes through screws to be connected with the hanging basket barrel. The at least one wire pressing plate covers the outer side of the sensor wire and is positioned in the accommodating cavity; the head of the screw is located in the containing cavity and welded to the hanging basket barrel, and the nut matching portion of the screw is pressed to the top face of the wire cover plate through the nut with preset pre-tightening force. According to the fixing device, thermal expansion deformation generated in the axial direction of the hanging basket barrel can be adapted through the arrangement of the long holes, meanwhile, the elasticity of the wire cover plate in the width direction is adjustable, and therefore rigidity self-adaptability in the circumferential direction can be generated.

Description

Technical Field

[0001] The present invention relates to the technical field of reactor flow-induced vibration tests, and particularly relates to a wire fixing device and method for reactor flow-induced vibration tests. Background Art

[0002] The in-core structure is extremely complex, including components such as the upper in-core structure, the lower in-core structure, and the in-core measurement grid. The in-core structure is located inside the reactor pressure vessel and jointly completes various functions of the reactor with equipment such as the pressure vessel, the control rod drive mechanism, and the fuel assembly.

[0003] As one of the most important main equipment in the reactor core system, the reliability and safety of the in-core structure are of crucial importance during operation.

[0004] Prototype reactors need to conduct comprehensive flow-induced vibration tests on the in-core structure to verify the reliability of the structural design of the in-core structure. During the comprehensive flow-induced vibration test of the in-core structure, experimental data need to be measured by corresponding sensors.

[0005] Therefore, sensors with different functions are installed at multiple positions inside the reactor. Since the sensors are located inside the reactor and the container has a large interference on wireless transmission signals, it is necessary to transmit the sensor signals through wires.

[0006] At the same time, the working environment inside the reactor is relatively harsh, with high temperature, high coolant flow rate, and large impact loads. If the wires are not fixed inside the reactor, they are easily damaged by high-speed fluids.

[0007] In the design of wire fixing components, there are many difficulties. Since the flow rate at the inlet nozzle can reach 20 m / s, the fluid will directly impact the fixing components. In previous reactor tests, there have been failures due to insufficient strength of the fixing components and insufficient stiffness, resulting in a long repair process and poor economy.

[0008] Based on this, the inventors of the present application propose a wire fixing device and method for reactor flow-induced vibration tests, in order to solve one or more of the above technical problems. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the defect that the sensor wire fixing device in the prior art is prone to failure, and provide a wire fixing device and method for reactor flow-induced vibration tests.

[0010] The present invention solves the above technical problems by the following technical solutions:

[0011] The present invention provides a wire fixing device for reactor flow-induced vibration tests, which is characterized by including:

[0012] The wire cover plate is provided with an opening on one side and has a receiving cavity. The open end of the wire cover plate is connected to the outer wall of the hanging basket cylinder. The sensor wire is arranged in the receiving cavity. A round hole is formed in the middle of the wire cover plate. At least one long hole is arranged on each side of the round hole along the length extension direction of the wire cover plate. The wire cover plate is connected to the hanging basket cylinder by screws passing through the round hole or the long hole.

[0013] At least one wire pressing plate covers the outside of the sensor wire and is located in the receiving cavity. Among them,

[0014] The head of the screw is located in the receiving cavity and is welded to the hanging basket cylinder. The nut matching part of the screw is pressed against the top surface of the wire cover plate by a nut with a preset pre-tightening force.

[0015] According to an embodiment of the present invention, bevels are respectively arranged on both sides of the head of the screw.

[0016] According to an embodiment of the present invention, the thread profile of the screw is circular.

[0017] According to an embodiment of the present invention, a wire passing groove is formed on the side of the wire cover plate, and the wire passing groove is communicated with the receiving cavity.

[0018] According to an embodiment of the present invention, the long axis of the long hole is consistent with the length extension direction of the wire cover plate.

[0019] According to an embodiment of the present invention, the middle part of the wire pressing plate is bent to form a receiving cavity, and the sensor wire is accommodated in the receiving cavity.

[0020] At least one connection hole is arranged on each side of the wire pressing plate. The wire pressing plate is connected to the hanging basket cylinder by welding at the connection hole.

[0021] According to an embodiment of the present invention, the wire cover plate has a first end and a second end. The first end is close to the inlet nozzle, and the second end is far from the inlet nozzle.

[0022] The number of the long holes arranged at the first end of the wire cover plate is greater than the number of the long holes arranged at the second end.

[0023] According to an embodiment of the present invention, fillet welding connection is adopted between the screw and the nut.

[0024] According to an embodiment of the present invention, a convex part is arranged on the inner side of the receiving cavity of the wire cover plate, and one end of the convex part presses against the top wall of the wire pressing plate.

[0025] The present invention also provides a method for fixing wires used in the reactor flow-induced vibration test, which is realized by using the wire fixing device for the reactor flow-induced vibration test as described above. The fixing method includes:

[0026] Determine the installation positions of the screws and weld the heads of the screws to the basket cylinder body, and then fix the sensor wires by using the wire pressing plate;

[0027] Cover the wire cover plate on the outer wall of the basket cylinder body, and make the screws pass through the round holes or long holes and ensure that the sensor wires are located in the accommodating cavity of the wire cover plate;

[0028] Install the nuts, and make the nuts press against the top surface of the wire cover plate with a preset pre-tightening force, and then perform fillet welding on the screws and the nuts to prevent loosening.

[0029] The positive and progressive effects of the present invention are as follows:

[0030] For the wire fixing device for the reactor flow-induced vibration test of the present invention, the wire cover plate is in a manner of screw and thread cooperation, and round holes and long holes are respectively arranged on the wire cover plate. The screws at the round holes play a fixing role, while the long holes are used to adapt to the thermal expansion deformation in the axial direction of the basket cylinder body; at the same time, the accommodating cavity of the wire cover plate not only plays a role in accommodating the sensor wires, but is also elastically adjustable in the width direction. Thus, the wire cover plate can generate circumferential stiffness self-adaptation through elastic deformation after being subjected to a load. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other features, properties and advantages of the present invention will become more obvious through the following description in conjunction with the drawings and embodiments, where:

[0032] Figure 1 is a schematic diagram of the cooperation between the wire fixing device for the reactor flow-induced vibration test of the present invention and the basket cylinder body;

[0033] Figure 2 is a schematic structural diagram of the wire fixing device for the reactor flow-induced vibration test of the present invention from another angle;

[0034] Figure 3 is a schematic structural diagram of the wire fixing device for the reactor flow-induced vibration test of the present invention without installing the wire pressing plate and installed with the basket cylinder body;

[0035] Figure 4 is a schematic structural diagram of the wire pressing plate of the present invention;

[0036] Figure 5 is a schematic structural diagram of the wire cover plate of the present invention;

[0037] Figure 6 is Figure 5Schematic diagram of the enlarged structure at A in the [Chinese description];

[0038] Figure 7 Schematic diagram of the structure of the screw of the present invention;

[0039] Figure 8 Schematic diagram of the structure of the nut of the present invention;

[0040] Figure 9 Schematic diagram of the wire pressing plate pressing different numbers of sensor wires;

[0041] Figure 10 Schematic diagram of the position arrangement of the wire fixing device of the present invention in the flow field from the top view angle of the pressure vessel.

[0042] 1. Wire cover plate; 11. Accommodating cavity; 12. Round hole; 13. Long hole; 14. Wire groove; 15. First end; 16. Second end; 17. Protrusion;

[0043] 2. Basket cylinder;

[0044] 3. Sensor wire;

[0045] 4. Wire pressing plate; 41. Accommodating cavity; 42. Connecting hole;

[0046] 5. Screw;

[0047] 6. Nut. Detailed implementation manners

[0048] The present invention will be further described below in conjunction with specific embodiments and the accompanying drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention is clearly capable of being implemented in many other ways different from this description. Those skilled in the art can make similar extensions and deductions according to the actual application situation without departing from the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0050] Please refer to Figures 1 to 4, the present invention provides a wire fixing device for a reactor flow-induced vibration test. The wire fixing device includes a wire cover plate 1 and at least one wire pressing plate 4. One side of the wire cover plate 1 is open and has a receiving cavity 11. The open end of the wire cover plate 1 is connected to the outer wall of the hanging basket cylinder 2. The sensor wire 3 is arranged in the receiving cavity 11. A round hole 12 is formed in the middle of the wire cover plate 1. At least one long hole 13 is arranged on each side of the round hole 12 along the length extension direction of the wire cover plate 1. The wire cover plate 1 is connected to the hanging basket cylinder 2 through a screw 5 passing through the round hole 12 or the long hole 13; at least one wire pressing plate 4 covers the outside of the sensor wire 3 and is located in the receiving cavity 11; wherein, the head of the screw 5 is located in the receiving cavity 11 and is welded to the hanging basket cylinder 2, and the nut 6 mating part of the screw 5 is pressed against the top surface of the wire cover plate 1 with a preset pre-tightening force.

[0051] When the prototype reactor is undergoing a vibration test, the test data needs to be measured by corresponding sensors, and the wires of the sensors are easily affected by fluid impact loads. Therefore, a fixing device is required to fix them.

[0052] In traditional fixing devices, bolts and nuts are mainly used in combination to fix the cover plate arranged outside the sensor wire 3. However, the environment inside the reactor is extremely harsh. Subject to thermal expansion and fluid impact, the connection between the bolt and the nut is prone to looseness and even the risk of falling off. Once some components fall off, it is very difficult to search inside the large-volume and complex internal structure of the reactor after the test, resulting in the defects of a long maintenance process and poor economy.

[0053] That is to say, for the complex environment inside the reactor, the wire fixing device needs to not only meet the strength requirements to resist the impact of the coolant, but also meet the "flexibility" requirements to adapt to the deformation caused by thermal expansion.

[0054] It should be noted that the structure of the screw 5 generally includes a head and a threaded column. The threaded column is used to cooperate with the nut 6. The head is the end used to cooperate with external tools. And the head of the present invention is directly welded to the outer wall of the hanging basket cylinder 2 and is accommodated in the receiving cavity 11.

[0055] Based on this, the present invention provides a wire cover plate 1 and two types of holes are arranged on the wire cover plate 1. One is the round hole 12 arranged in the middle, and the screw 5 and the nut 6 are used in combination to fix its position; the other is the long hole 13 arranged on both sides of the round hole 12. The long hole 13 is to avoid the structural damage and failure of the wire cover plate 1, the screw 5, and the nut 6 caused by the deformation of the components due to thermal expansion.

[0056] That is, the wire cover plate 1 of the present invention is not directly connected to the basket cylinder 2 by welding or threaded connectors. Instead, by using the cooperation of the screw 5 and the nut 6, under the action of the preset pressing force of the nut 6, it is pressed against the outer wall of the basket cylinder 2, and then two kinds of holes are provided along the length extension direction of the wire cover plate 1 to meet the self-adaptive deformation requirements brought by thermal expansion, thereby adapting to the complex in-pile environment.

[0057] For the installation of the screw 5 and the nut 6, the present invention welds the head of the screw 5 to the outer wall of the basket cylinder 2, and then uses the nut 6 to press it against the top surface of the wire cover plate 1 with a preset pre-tightening force. At this time, the wire cover plate 1 will be deformed under pressure, and this deformation also improves the connection strength between the wire cover plate 1 and the basket cylinder 2.

[0058] Please refer to Figure 1 、 Figure 2 and Figure 10 It can be seen that the wire cover plate 1 proposed by the present invention is pressed against the outer wall of the basket cylinder 2 through the cooperation of the screw 5 and the nut 6, and is not fixedly connected to the outer wall of the basket cylinder 2. Since the distance between the top of the wire cover plate 1 and the inlet nozzle is relatively close, when the coolant enters from the inlet nozzle, it will directly impact the outer wall of the basket cylinder 2 at a speed of 20 m / s. During the impact process, the wire cover plate 1 will be impacted. To avoid structural damage to the wire cover plate 1 under the impact, the wire cover plate 1 of the present invention is elastically adjustable in the width direction, similar to a leaf spring. Thus, after being loaded, it can generate circumferential stiffness self-adaptability by means of its own elastic deformation.

[0059] Therefore, the fixing device proposed by the present invention can not only adapt to the structural deformation brought by the thermal expansion in the axial direction of the basket cylinder 2, but also adapt to the circumferential impact load.

[0060] Please refer to Figures 5 to 8 , the two sides of the head of the screw 5 are respectively provided with bevels.

[0061] It can be seen that setting the bevel can increase the fusion area during welding, make the weld deeper, thereby improving the connection strength between the screw 5 and the basket cylinder 2. Moreover, the bevel provides a guide for the welding heat source, making the energy more concentrated, which is beneficial to improving the weld forming quality, and further improving the connection strength between the screw 5 and the basket cylinder 2.

[0062] Please refer to Figure 7 , the thread profile of the screw 5 is circular.

[0063] Compared with the traditional square thread profile, the circular thread profile of the present invention can effectively reduce stress concentration, avoid cracks that are prone to occur at the right-angle root of the square thread, and is beneficial to extending the service life of the screw 5 under dynamic loads (vibration, impact). Thus, it meets the usage requirements of the present invention in the complex in-pile environment, and can improve the connection strength and anti-loosening effect between the screw 5 and the nut 6.

[0064] Please continue to refer to Figure 5 and Figure 6 A wire passing groove 14 is provided on the side of the wire cover plate 1 , and the wire passing groove 14 is communicated with the accommodating cavity 11 .

[0065] Since there are many types of sensors in the flow-induced vibration test and their positions are widely distributed, the sensor wires 3 will be introduced into the wire cover 1 from multiple directions. Therefore, the wire cover 1 not only has an accommodating cavity 11 on the inner side along its length direction, but also has a wire groove 14 on its side, thereby meeting the protection needs of the sensor wires 3 at different positions.

[0066] That is, the wire cover plate 1 proposed in the present invention can not only ensure the neat arrangement of the sensor wires 3 inside the reactor, but also the gap between the wire cover plate 1 and the hanging basket cylinder 2 can guide the wires; moreover, slotting on the side of the wire cover plate 1 can expand the use range of the wire cover plate 1, and the sensor wires 3 do not need to extend into the wire cover plate 1 from the bottom of the wire cover plate 1, but can also extend into the wire cover plate 1 from the side for guidance and fixation.

[0067] Specifically, the location and number of the wire ducts 14 can be determined in advance, which will not be elaborated herein.

[0068] It can be seen that there is a temperature gradient in the reactor and the thermal expansion of different components is inconsistent. Therefore, the present invention arranges long holes 13 along the length extension direction of the wire cover plate 1, so as to avoid the failure of the connection between the wire cover plate 1 and the hanging basket cylinder 2 caused by different degrees of thermal expansion deformation.

[0069] At the same time, due to the circumferential impact of the external coolant, the wire cover plate 1 is elastically adjustable in the width direction, thereby generating circumferential stiffness adaptability by elastic deformation.

[0070] Please continue to refer to Figures 2 to 4 The middle part of the wire pressing plate 4 is bent to form a receiving cavity 41, and the sensor wire 3 is accommodated in the receiving cavity 41; at least one connecting hole 42 is opened on each side of the wire pressing plate 4, and the wire pressing plate 4 is connected to the hanging basket cylinder 2 by welding at the connecting hole 42.

[0071] There are multiple wire pressing plates 4 extending along the wire cover plate 1, and the specific number can be adjusted according to actual needs and is not limited here.

[0072] The wire pressing plate 4 is used to protect the sensor wire 3. The wire pressing plate 4 is connected to the hanging basket cylinder 2 by welding, thereby satisfying the connection strength between the wire pressing plate 4 and the hanging basket cylinder 2.

[0073] Please refer to Figure 9, it can be seen that the wire pressing plate 4 can be pressed according to the number of sensor wires 3, and its own structure can be deformed under an external pressing tool to fix the sensor wires 3 in the accommodation cavity 41.

[0074] Specifically, for the connection hole 42, the connection hole 42 can be a through hole or a groove, and can be selected according to different welding methods, which is not limited herein.

[0075] Please continue to refer to Figure 5 and Figure 6 , the wire cover plate 1 has a first end 15 and a second end 16. The first end 15 is close to the inlet nozzle, and the second end 16 is far from the inlet nozzle; the number of long holes 13 provided at the first end 15 of the wire cover plate 1 is greater than the number of long holes 13 provided at the second end 16.

[0076] Because the flow rate of the coolant at the inlet nozzle is higher, in order to ensure the connection strength between the wire cover plate 1 and the basket cylinder 2, the present invention has more long holes 13 provided near the inlet nozzle.

[0077] Figure 5 shows an embodiment in which the long holes 13 are evenly distributed. In order to adapt to the impact strength of the flow rate near the inlet nozzle, Figure 5 in the direction from the top to the bottom, the spacing between the long holes 13 can be set to gradually increase. The specific arrangement of the long holes 13 can be adjusted according to actual needs, which will not be elaborated herein.

[0078] Optionally, along the direction from the first end 15 to the second end 16, the spacing between adjacent long holes 13 increases.

[0079] In one embodiment, the screw 5 and the nut 6 are fillet welded.

[0080] It can be seen that affected by the impact of the coolant, the fixing device needs to have a certain strength to avoid being damaged by the impact of the coolant, such as the connection between the screw 5 and the nut 6 becoming loose. There is a temperature gradient in the reactor, the thermal expansion of different components is different, and the flow rate and pressure change at all times. Therefore, it is necessary to adapt to the effects brought by various factors such as different flow rates, pressures, and temperatures.

[0081] That is to say, the top of the connection between the screw 5 and the nut 6 of the present invention is further fillet welded to prevent loosening, thereby avoiding the problem of the connection between the nut 6 and the screw 5 becoming loose under the impact of the coolant.

[0082] At the same time, the wire cover plate 1 is covered outside the wire cover plate 1 under the installation of the screw 5 and the nut 6, and itself is not directly fixedly connected to the basket cylinder 2. Therefore, the long holes 13 provided on the wire cover plate 1 can adapt to the deformation caused by the thermal expansion of different components.

[0083] That is to say, the fixing device provided by the present invention not only meets the strength requirements under the impact of the coolant, but also meets the self-adaptive rigidity requirements brought about by thermal expansion, thus meeting the usage requirements in the complex environment inside the reactor.

[0084] Please continue to refer to Figure 2 and Figure 4 , the wire cover plate 1 is provided with a convex portion 17 inside the accommodating cavity 11, and one end of the convex portion 17 presses against the top wall of the wire pressing plate 4.

[0085] The convex portion 17 is provided on the wire cover plate 1 to further protect the wire pressing plate 4, thereby improving the connection strength between the wire pressing plate 4 and the basket cylinder 2.

[0086] In summary, for the wire fixing device for the reactor flow-induced vibration test proposed by the present invention, the wire cover plate 1 not only ensures the neat arrangement of the sensor wires 3 inside the reactor, but also the gap between the wire cover plate 1 and the basket cylinder 2 guides the sensor wires 3.

[0087] Considering that the thermal expansions of different components are inconsistent, and the flow rate and pressure change at all times, the fixing device needs to meet a certain rigidity to adapt to the influences brought about by various factors such as different flow rates, pressures, and temperatures.

[0088] The wire cover plate 1 is fixed to the outer wall of the basket cylinder 2 by means of the cooperation of the screw 5 and the nut 6 and welding. Compared with the traditional single fixing method, the fixing reliability of the wire cover plate 1 is improved.

[0089] The present invention also proposes a wire fixing method for the reactor flow-induced vibration test, which is realized by using the above-mentioned wire fixing device for the reactor flow-induced vibration test. The fixing method includes:

[0090] Determine the installation position of the screw and weld the head of the screw to the basket cylinder, and then fix the sensor wire by using the wire pressing plate;

[0091] Cover the wire cover plate on the outer wall of the basket cylinder, and make the screw pass through the round hole or the long hole and ensure that the sensor wire is located in the accommodating cavity of the wire cover plate;

[0092] Install the nut, and make the nut press against the top surface of the wire cover plate with a preset pre-tightening force, and then perform fillet welding on the screw and the nut to prevent loosening.

[0093] It can be seen that the installation process of the fixing device of the present invention is:

[0094] First, install the screw and the wire pressing plate. Then, cover the wire cover plate outside the wire pressing plate, and use the nut to press against the wire pressing plate to make its structural strength higher. Finally, perform fillet welding to prevent loosening of the screw and the nut. Thus, the fixing device not only has the protection strength against the impact of the coolant, but also has the adaptive rigidity brought by thermal expansion, flow rate, and pressure, meeting the usage requirements in the complex environment inside the reactor.

[0095] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "link", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0096] The present application uses specific terms to describe the embodiments of the present application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification is not necessarily the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the present application can be appropriately combined.

[0097] Although the present invention is disclosed above with preferred embodiments, it is not used to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A wire fixing device for reactor fluid-induced vibration test, characterized in that, Including: A wire cover plate, which is open on one side and has a receiving cavity. The open end of the wire cover plate is connected to the outer wall of the hanging basket cylinder. The sensor wire is arranged in the receiving cavity. A round hole is formed in the middle of the wire cover plate. At least one long hole is arranged on each side of the round hole along the length extension direction of the wire cover plate. The wire cover plate is connected to the hanging basket cylinder by screws passing through the round hole or the long hole; At least one wire pressing plate, which is covered outside the sensor wire and is located in the receiving cavity; wherein, The head of the screw is located in the receiving cavity and is welded to the hanging basket cylinder. The nut matching part of the screw is pressed against the top surface of the wire cover plate by a nut with a preset pre-tightening force.

2. The wire fixing device for the reactor flow-induced vibration test according to claim 1, characterized in that Grooves are respectively arranged on both sides of the head of the screw.

3. The wire fixing device for the reactor flow-induced vibration test according to claim 1, characterized in that, The thread profile of the screw is circular.

4. The wire fixing device for the reactor flow-induced vibration test according to claim 1, wherein A wire groove is formed on the side of the wire cover plate, and the wire groove communicates with the receiving cavity.

5. The wire fixing device for the reactor flow-induced vibration test according to claim 1, characterized in that, The long axis of the long hole is consistent with the length extension direction of the wire cover plate.

6. The wire fixing device for the reactor fluid-induced vibration test according to claim 1, characterized in that, The middle part of the wire pressing plate is bent to form a receiving cavity, and the sensor wire is placed in the receiving cavity; At least one connection hole is respectively arranged on both sides of the wire pressing plate. The wire pressing plate is connected to the hanging basket cylinder by welding at the connection hole.

7. The wire fixing device for the reactor fluid-induced vibration test according to claim 1, characterized in that, The wire cover plate has a first end and a second end. The first end is close to the inlet nozzle, and the second end is far from the inlet nozzle; The number of long holes arranged at the first end of the wire cover plate is greater than the number of long holes arranged at the second end.

8. The wire fixing device for the reactor fluid-induced vibration test according to claim 1, characterized in that, The screw and the nut are connected by fillet welding.

9. The wire fixing device for the reactor fluid-induced vibration test according to claim 1, characterized in that A convex part is arranged on the inner side of the receiving cavity of the wire cover plate, and one end of the convex part presses against the top wall of the wire pressing plate.

10. A method for fixing wires used in a reactor flow-induced vibration test, characterized in that, Realized by using the wire fixing device for the reactor flow-induced vibration test according to any one of claims 1-9. The fixing method includes: Determine the installation position of the screw and weld the head of the screw to the hanging basket cylinder, and then fix the sensor wire by using the wire pressing plate; Cover the wire cover plate on the outer wall of the hanging basket cylinder, and make the screw pass through the round hole or the long hole and ensure that the sensor wire is located in the receiving cavity of the wire cover plate; Install the nut, and make the nut press against the top surface of the wire cover plate with a preset pre-tightening force, and then perform fillet welding on the screw and the nut to prevent loosening.

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