Nuclear power station generator vibration pick-up device

Abstract

The utility model discloses a vibration pick-up device for a generator in a nuclear power station. The vibration pick-up device comprises a supporting piece fixedly connected to the outer side wall of a bearing bush of the generator; the connecting assembly is perpendicular to a rotating shaft of the generator, and the first end of the connecting assembly is fixedly connected with the supporting piece; the adjusting assembly is detachably connected with the second end, away from the supporting piece, of the connecting assembly; the acceleration sensor is mounted and fixed on the supporting piece and is externally connected with a power supply; and the eddy current sensor is connected with the adjusting assembly and externally connected with a power supply. By using the vibration pick-up device for the generator of the nuclear power station, the first-order inherent frequency is greatly improved, the known power grid disturbance frequency area near 100Hz at present is successfully avoided, and the influence on signals caused by resonance of the original bracket frequency and the power grid disturbance frequency in the vibration fluctuation of a generator rotor is effectively eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of on-line vibration monitoring of steam turbine generator sets, in particular to a vibration pickup device for a nuclear power plant generator. Background Art

[0002] During the stable operation of the on-line vibration monitoring system of a steam turbine generator set, the authenticity of the measurement data is crucial for the unit and the operators. When a vibration signal fault occurs in the unit equipment, it is necessary to first identify whether the vibration value is the true vibration of the equipment before analyzing and processing the signal. For a long time, there has been a problem that the vibration of the generator of a certain nuclear power plant semi-speed machine fluctuates with the power grid, and the measured vibration value is relatively large. The fundamental reason is that the first natural frequency of the fixed bracket of its generator vibration sensor is close to the power grid frequency of 100 Hz in the frequency domain.

[0003] Existing similar devices reduce the natural frequency of the bracket by setting counterweights, effectively avoiding electromagnetic interference resonance. However, subsequent test data shows that this interval may still be easily excited by power grid disturbances. Therefore, the method of reducing the frequency cannot effectively eliminate signal interference. Increasing the frequency of the bracket can, on the one hand, avoid the known power grid disturbance frequency area below 100 Hz in order to completely eliminate the resonance factor; on the other hand, even if there are still power grid disturbance frequencies above 100 Hz, the increase in stiffness and appropriate increase in damping will effectively reduce the resonance amplitude and improve the response degree.

[0004] Due to the special structure of the sensor bracket, its stiffness is relatively low and the natural frequency is relatively low, so it is difficult to increase the frequency. Given that the vibration of the generator often exceeds the limit value for a short time during power grid disturbances, which seriously affects the condition monitoring of the unit and is universal. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a vibration pickup device for a nuclear power plant generator.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a vibration pickup device for a nuclear power plant generator, comprising:

[0007] A support member fixedly connected to the outer wall of the bearing bush of the generator;

[0008] A connecting component perpendicular to the rotating shaft of the generator, the first end of the connecting component being fixedly connected to the support member;

[0009] An adjusting component detachably connected to the second end of the connecting component away from the support member;

[0010] An acceleration sensor installed and fixed on the support member and externally connected to a power supply;

[0011] An eddy current sensor, which is connected to the adjustment component and externally connected to a power supply.

[0012] In some embodiments, the connection component includes a sleeve and at least two reinforcing ribs. The first end of the sleeve is fixedly connected to the support member, and the second end of the sleeve is connected to the adjustment component; the two reinforcing ribs are symmetrically distributed on the outer periphery of the sleeve and are respectively fixedly connected to the support member and fixedly connected to the sleeve.

[0013] In some embodiments, the axial cross-section of the reinforcing rib along the sleeve is a right triangle. The long right-angled side of the reinforcing rib is connected to the sleeve, and the short right-angled side of the reinforcing rib is connected to the support member;

[0014] The connecting surface of the long side of the reinforcing rib matches the outer wall surface shape of the sleeve.

[0015] In some embodiments, the adjustment component includes a coarse adjustment component and a fine adjustment component. The first end of the coarse adjustment component is screwed or multi-stage clamped to the sleeve, and the second end of the coarse adjustment component is connected to the fine adjustment component.

[0016] In some embodiments, the second end of the sleeve is provided with a first internal thread; the coarse adjustment component includes a first locking nut and an adjusting member. The first locking nut is provided with a second internal thread opposite to the first internal thread. The first end of the adjusting member is provided with a first external thread that matches the first internal thread and the second internal thread, and is respectively screwed and fixed to the sleeve and the first locking nut. The second end of the adjusting member is connected to the fine adjustment component;

[0017] Alternatively, the second end of the sleeve is provided with a plurality of clamping grooves arranged at intervals along the axial direction of the sleeve; the coarse adjustment component includes an adjusting member, and the first end of the adjusting member is provided with at least one elastic protrusion that cooperates with the clamping groove.

[0018] In some embodiments, the fine adjustment component includes a second locking nut and a boss provided with a third internal thread. The boss and the adjusting member are an integral structure. The second locking nut is provided with a fourth internal thread opposite to the third internal thread;

[0019] The eddy current sensor is provided with a second external thread that matches the third internal thread and the fourth internal thread, and the eddy current sensor is screwed and fixed to the boss and the second locking nut.

[0020] In some embodiments, the support member is provided with an assembly hole and at least two connection holes. The sleeve is inserted into the assembly hole and welded and fixed to the assembly hole. Each connection hole is connected to the outer side wall of the bearing bush of the generator through a bolt;

[0021] The abutting surface where the support member abuts against the outer side wall of the bearing bush of the generator is an arc surface.

[0022] In some embodiments, the support member and the sleeve are perpendicular to each other and form an L-shaped structure.

[0023] In some embodiments, the length of the long right-angled side of the reinforcing rib is 190 mm - 210 mm, the length of the short right-angled side where the reinforcing rib is connected to the support member is 35 mm - 45 mm, the wall thickness of the sleeve is 2.9 mm - 3.1 mm, and the thickness of the support member is 18 mm - 22 mm.

[0024] In some embodiments, the acceleration sensor is fixedly connected to the support member through an insulating member.

[0025] By implementing the present utility model, the following beneficial effects are achieved:

[0026] The vibration pickup device for a nuclear power plant generator of the present utility model includes: a support member fixedly connected to the outer side wall of the bearing bush of the generator; a connection component perpendicular to the rotating shaft of the generator, with the first end of the connection component fixedly connected to the support member; an adjustment component detachably connected to the second end of the connection component away from the support member; an acceleration sensor installed and fixed on the support member and externally connected to a power source; and an eddy current sensor connected to the adjustment component and externally connected to a power source. When using the vibration pickup device for a nuclear power plant generator of the present utility model, its first natural frequency is greatly improved, successfully avoiding the currently known power grid disturbance frequency region near 100 Hz, and effectively eliminating the influence on the signal caused by the resonance between the original support frequency and the power grid disturbance frequency in the vibration fluctuation of the generator rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0028] Figure 1 is a schematic structural diagram of a vibration pickup device for a nuclear power plant generator according to an embodiment of the present utility model;

[0029] Figure 2 is Figure 1 the installation schematic diagram of the vibration pickup device for a nuclear power plant generator in;

[0030] Figure 3 is Figure 1 the structural schematic diagram of the connection component in;

[0031] Figure 4 is Figure 1 the exploded view of the adjustment component in;

[0032] Figure 5 is Figure 1 the front view of the support member in;

[0033] Figure 6 is Figure 1 The top view of the middle support member. Specific embodiments

[0034] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail with reference to the accompanying drawings.

[0035] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0036] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model 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. Therefore, it cannot be understood as a limitation to the present utility model. 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 quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0037] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a chemical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0038] See Figures 1 to 6, an embodiment of the present utility model discloses a vibration pickup device for a nuclear power plant generator, comprising: a support member 1 fixedly connected to the outer side wall of the bearing shell 7 of the generator, a connection assembly 2 perpendicular to the rotating shaft 8 of the generator, an adjustment assembly 3, an acceleration sensor 4 and an eddy current sensor 5. The first end of the connection assembly 2 is fixedly connected to the support member 1, and the adjustment assembly 3 is detachably connected to the second end of the connection assembly 2 away from the support member 1. The connection assembly 2 extends towards the direction of the generator rotating shaft 8, and there is a gap between the connection assembly 2 and the surface of the bearing shell 7 of the generator. The acceleration sensor 4 is installed and fixed on the support member 1 and is externally connected to a power source. The acceleration sensor 4 is arranged towards the direction away from the generator rotating shaft 8. The eddy current sensor 5 is connected to the adjustment assembly 3 and is externally connected to a power source. Among them, the support member 1 is used for fixedly installing on the bearing shell 7 of the generator, providing a stable supporting force for the connection assembly 2 and providing an installation support point for the acceleration sensor 4. The connection assembly 2 is used for installing the eddy current sensor 5 and providing an installation support point for the eddy current sensor 5. The acceleration sensor 4 is used for measuring the bearing vibration, that is, the vibration signal of the bearing shell 7 of the generator. The eddy current sensor 5 is used for measuring the shaft vibration, that is, the vibration signal of the generator rotating shaft 8. The adjustment assembly 3 is used to meet the installation accuracy requirements for the distance between the eddy current sensor 5 and the monitoring surface, that is, for adjusting the distance between the eddy current sensor 5 and the rotating shaft 8 of the generator. The separate design of the connection assembly 2 and the adjustment assembly 3 makes the connection part easy to disassemble and the distance adjustment flexible, suitable for the wide application of sensors with high installation accuracy requirements.

[0039] When using the vibration pickup device for a nuclear power plant generator of the present utility model, its first-order natural frequency is greatly improved. A field knocking test is carried out on the vibration pickup device for a nuclear power plant generator, successfully avoiding the currently known power grid disturbance frequency area near 100Hz, and effectively eliminating the influence on the signal caused by the resonance between the original support frequency and the power grid disturbance frequency in the vibration fluctuation of the generator rotor.

[0040] As Figure 2 shown, it is an installation schematic diagram of the vibration pickup device for a nuclear power plant generator according to an embodiment of the present utility model. Among them, the vibration pickup device for a nuclear power plant generator includes two and is arranged perpendicular to each other. The shaft vibrations in two directions are respectively monitored, and the support stiffness in two directions is respectively reflected. The specific monitoring method is the prior art and will not be elaborated here.

[0041] In some embodiments, such as Figure 3As shown, the connecting component 2 includes a sleeve 21 and at least two reinforcing ribs 22. The first end of the sleeve 21 is fixedly connected to the support member 1, such as by welding or screwing. The second end of the sleeve 21 is connected to the adjusting component 3, such as by welding or screwing. The eddy current sensor 5 is disposed outside the second end of the sleeve 21 through a cable. The cable passes through the first end of the sleeve 21 and extends out to be externally connected to a power source. The two reinforcing ribs 22 are symmetrically distributed on the outer periphery of the sleeve 21 and are respectively fixedly connected to the support member 1 and the sleeve 21. The sleeve 21 is set as a circular ring stretching body, and the inner diameter of its circular ring needs to be greater than the maximum diameter of the cable and the eddy current sensor 5 passing through the circular ring. The reinforcing ribs 22 are used to strengthen the connection stiffness of the sleeve 21. The number of the reinforcing ribs 22 is selected according to the actually required connection stiffness, such as two, three, four, etc. The more the number, the stronger the connection stiffness. Preferably, the support member 1 and the sleeve 21 are perpendicular to each other and form an L-shaped structure.

[0042] In some embodiments, the axial cross-section of the reinforcing rib 22 along the sleeve 21 is a right triangle. The long right-angled side of the reinforcing rib 22 is connected to the sleeve 21, and the short right-angled side of the reinforcing rib 22 is connected to the support member 1. The connection surface of the long side of the reinforcing rib 22 matches the outer wall surface shape of the sleeve 21. To enhance the fit between the reinforcing rib 22 and the sleeve 21 and strengthen the connection stiffness of the sleeve 21. For example, if the outer wall surface of the sleeve 21 is an arc surface, then the connection surface of the long side of the reinforcing rib 22 is an arc surface with the same diameter, and this connection surface is welded and fitted to the outer wall surface of the sleeve 21. Similarly, to enhance the fit between the reinforcing rib 22 and the support member 1 and further strengthen the connection stiffness of the sleeve 21. The surface of the reinforcing rib 22 connected to the support member 1 is a plane and is fixedly connected to the support member 1 by welding.

[0043] In some embodiments, as Figure 4 shown, the adjusting component 3 includes a coarse adjustment component and a fine adjustment component. The first end of the coarse adjustment component is screwed to the sleeve 21, and the second end of the coarse adjustment component is connected to the fine adjustment component. The fine adjustment component is connected to the eddy current sensor 5. The coarse adjustment component is used to adjust the relative position between the eddy current sensor 5 and the sleeve 21 in a large range to quickly reach a rough target position. The fine adjustment component is used to adjust the relative position between the eddy current sensor 5 and the sleeve 21 in a small range to reach a more accurate target position. It can be understood that in some other embodiments, the first end of the coarse adjustment component is multi-stage clamped to the sleeve 21, and multi-stage adjustment with a fixed amplitude can be achieved.

[0044] In some embodiments, the second end of the sleeve 21 is provided with a first internal thread 211 for tightly assembling with the coarse adjustment component. The coarse adjustment component includes a first locking nut 31 and an adjusting member 32. The first locking nut 31 is provided with a second internal thread opposite to the first internal thread 211. The first end of the adjusting member 32 is provided with a first external thread 321 that matches the first internal thread 211 and the second internal thread, and is screwed and fixed to the sleeve 21 and the first locking nut 31 respectively. The second end of the adjusting member 32 is connected to the fine adjustment component. The first locking nut 31 cooperates with the sleeve 21 to prevent the eddy current sensor 5 from generating axial displacement inside the sleeve 21 during operation.

[0045] When the position of the eddy current sensor 5 needs to be adjusted, first screw the adjusting member 32 into the sleeve 21, and then abut the first locking nut 31 against the sleeve 21 to achieve locking and prevent the adjusting member 32 from loosening. When repositioning is required, first separate the first locking nut 31 from the sleeve 21 to unlock the adjusting member 32, and then rotate the adjusting member 32 to further adjust its position. Preferably, the adjusting member 32 is made of an insulating material.

[0046] It can be understood that in some other embodiments, the second end of the sleeve 21 is provided with a plurality of clamping grooves arranged at intervals along the axial direction of the sleeve 21, and the distance between adjacent clamping grooves is the same. The coarse adjustment component includes an adjusting member 32, and at least one elastic protrusion that cooperates with the clamping groove is provided at the first end of the adjusting member 32. The elastic protrusion cooperates with the clamping groove to achieve positioning. Preferably, the clamping groove is an arc-shaped groove, and the elastic protrusion is arc-shaped. For enhanced fixation, multiple groups of clamping grooves can be provided along the circumferential direction of the sleeve 21, and the elastic protrusions are the same.

[0047] In some embodiments, the fine adjustment component includes a second locking nut 33 and a boss 34 provided with a third internal thread 341. The boss 34 and the adjusting member 32 are an integral structure. The second locking nut 33 is provided with a fourth internal thread 331 opposite to the third internal thread 341. The boss 34 extends radially outward along the adjusting member 32, and the boss 34 is a regular shape. For example, the boss 34 is a hexagonal boss 34 to facilitate tool clamping and rotation or hand rotation. Preferably, the boss 34 and the adjusting member 32 are an integral structure and are also made of an insulating material.

[0048] The eddy current sensor 5 is provided with a second external thread 51 that matches the third internal thread 341 and the fourth internal thread 331, and the eddy current sensor 5 is screwed and fixed to the boss 34 and the second locking nut 33. When the position of the eddy current sensor 5 needs to be adjusted, first screw the eddy current sensor 5 into the boss 34, and then abut the second locking nut 33 against the boss 34 to achieve locking and prevent the eddy current sensor 5 from loosening. When repositioning is required, first separate the second locking nut 33 from the boss 34 to unlock the eddy current sensor 5, and then rotate the eddy current sensor 5 to further adjust its position.

[0049] Understandably, the first internal thread 211, the second internal thread, and the first external thread 321 are relatively thicker threads compared to the third internal thread 341, the fourth internal thread 331, and the second external thread 51. That is, the third internal thread 341, the fourth internal thread 331, and the second external thread 51 are relatively thinner threads compared to the first internal thread 211, the second internal thread, and the first external thread 321.

[0050] In some embodiments, as Figure 5 and Figure 6 shown, the support member 1 is provided with an assembly hole 11 and at least two connection holes 12. The sleeve 21 is inserted into the assembly hole 11 and welded and fixed to the assembly hole 11. Each connection hole 12 is connected to the outer side wall of the bearing shell 7 of the generator through a bolt to fix the support plate on the outer side wall of the bearing shell 7 of the generator. The abutting surface 13 of the support member 1 abutting against the outer side wall of the bearing shell 7 of the generator is an arc surface, and the diameter of the arc surface is the same as the outer diameter of the bearing shell 7 of the generator to match the shape of the outer side wall of the bearing shell 7 of the generator, realizing arc surface mating contact, making the cooperation between the support member 1 and the bearing shell 7 of the generator closer and strengthening the fixation. The support member 1 is a plate body, and the assembly hole 11 and the two connection holes 12 are arranged near the opposite ends of the support member 1, leaving a space for installing the acceleration sensor 4 in between. Preferably, the support member 1 is provided with a square pit and several screw holes for connecting the acceleration sensor 4, which are not shown in the figure.

[0051] In some embodiments, the acceleration sensor 4 is fixedly connected to the support member 1 through the insulating member 6. The insulating member 6 is connected to the base of the acceleration sensor 4 through a short bolt, and the short bolt does not contact the support member 1. The insulating member 6 is located in the square pit of the support member 1, and the thickness of the insulating member 6 is the same as the depth of the square pit. The insulating member 6 is connected to the screw hole of the support member 1 through a long bolt, and the short bolt and the long bolt are arranged in a staggered manner. Preferably, the insulating member 6 is an insulating square block.

[0052] The insulating member 6 separates the acceleration sensor 4 and the support member 1, and the boss 34 made of insulating material separates the eddy current sensor 5 and the sleeve 21. On the premise of ensuring the installation accuracy of the acceleration sensor 4 and the eddy current sensor 5, the signal acquisition of the acceleration sensor 4 and the eddy current sensor 5 is completely insulated from the entire bearing shell 7 system of the generator in terms of physical contact, successfully eliminating the electrical signal interference brought by the metal bracket fixing the acceleration sensor 4 and the eddy current sensor 5 during the vibration pickup process.

[0053] In some embodiments, the length of the long right-angle side of the reinforcing rib 22 is 190 mm - 210 mm, such as 190 mm, 200 mm, 210 mm, etc. The length of the short right-angle side where the reinforcing rib 22 is connected to the support member 1 is 35 mm - 45 mm, such as 35 mm, 40 mm, 45 mm, etc. The wall thickness of the sleeve 21 is 2.9 mm - 3.1 mm, such as 2.9 mm, 3.0 mm, 3.1 mm, etc. The thickness of the support member 1 is 18 mm - 22 mm, such as 18 mm, 20 mm, 22 mm. Preferably, in this embodiment, the length of the long right-angle side of the reinforcing rib 22 is 200 mm, the length of the short right-angle side where the reinforcing rib 22 is connected to the support member 1 is 40 mm, the wall thickness of the sleeve 21 is 3.0 mm, and the thickness of the support member 1 is 20 mm, obtaining a natural frequency of 168 Hz for the vibration pickup device of the nuclear power plant generator, successfully avoiding the currently known power grid disturbance frequency region near 100 Hz.

[0054] The specific calculation method is as follows: The length of the long right-angle side of the reinforcing rib 22 is used as the parameter variable 1 for the structural optimization design, the length of the short right-angle side is used as the parameter variable 2, the wall thickness of the sleeve 21, that is, the difference between the inner diameter and the outer diameter, is used as the parameter variable 3, and the thickness of the support member 1 is used as the parameter variable 4. The dimensions of the remaining components are constants required for installation. With the help of the ansys simulation platform, a direct parameter method topology optimization calculation is performed. The maximum value of the overall first-order natural frequency of the vibration pickup device of the nuclear power plant generator is used as the objective function, the natural frequency of the bracket under each parameter is calculated, and the optimal solution combination under appropriate dimensions is selected. The specific method is not the key content of the present utility model and will not be elaborated here.

[0055] By directly adjusting each parameter variable intuitively using the direct parameter method, a first-order modal calculation is performed on the bracket respectively through the finite element software ansys. The structural parameters that can improve the overall natural frequency of the bracket during the calculation process are extracted, and the optimal parameter combination suitable for processing and meeting the installation fastening conditions is selected, which is determined as the structural dimensions of the final bracket.

[0056] Through the above calculation method, the following parameter design combination is finally selected (variable 1: the length of the long right-angle side of the reinforcing rib 22 is 200 mm, variable 2: the length of the short right-angle side of the reinforcing rib 22 is 40 mm, variable 3: the wall thickness of the sleeve 21 is 3 mm, variable 4: the thickness of the support member 1 is 20 mm), obtaining a natural frequency of 168 Hz for the vibration pickup device. The significant increase in frequency has successfully avoided the currently known power grid disturbance frequency region near 100 Hz.

[0057] The vibration pickup device for nuclear power plant generators of the present utility model effectively eliminates the influence on signals caused by the resonance between the original support frequency and the power grid disturbance frequency in the vibration fluctuation of the generator rotor, thereby solving the problem of abnormal vibration fluctuation of the bearing 7 of the generator, greatly saving the economic losses of cylinder opening and maintenance caused by false high vibration signals during the daily operation and overhaul of the generator, and at the same time also making an important contribution to improving the reliability of the vibration monitoring system of the bearing 7 of the generator and ensuring the operation stability of the unit.

[0058] By implementing the present utility model, the following beneficial effects are achieved:

[0059] For the vibration pickup device for nuclear power plant generators of the present utility model, its first-order natural frequency is greatly improved, successfully avoiding the known power grid disturbance frequency region near 100Hz, and effectively eliminating the influence on signals caused by the resonance between the original support frequency and the power grid disturbance frequency in the vibration fluctuation of the generator rotor.

[0060] It can be understood that the above embodiments only represent the preferred embodiments of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above embodiments or technical features can be freely combined, and several deformations and improvements can also be made, and these all belong to the protection scope of the present utility model, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments; therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A vibration pickup device for a nuclear power plant generator, characterized in that, Comprising: A support member (1) fixedly connected to the outer wall of the bearing bush (7) of the generator; A connection assembly (2) perpendicular to the rotating shaft (8) of the generator, with the first end of the connection assembly (2) fixedly connected to the support member (1); An adjustment assembly (3) detachably connected to the second end of the connection assembly (2) away from the support member (1); An acceleration sensor (4) mounted and fixed on the support member (1) and externally connected to a power source; An eddy current sensor (5) connected to the adjustment assembly (3) and externally connected to a power source.

2. The generator vibration pickup device for a nuclear power plant according to claim 1, characterized in that The connection assembly (2) includes a sleeve (21) and at least two reinforcing ribs (22). The first end of the sleeve (21) is fixedly connected to the support member (1), and the second end of the sleeve (21) is connected to the adjustment assembly (3); the two reinforcing ribs (22) are symmetrically distributed on the outer periphery of the sleeve (21) and are respectively fixedly connected to the support member (1) and fixedly connected to the sleeve (21).

3. The generator vibration pickup device of a nuclear power plant according to claim 2, characterized in that, The axial cross-section of the reinforcing rib (22) along the sleeve (21) is a right triangle. The long right side of the reinforcing rib (22) is connected to the sleeve (21), and the short right side of the reinforcing rib (22) is connected to the support member (1); The connecting surface of the long side of the reinforcing rib (22) matches the outer wall surface shape of the sleeve (21).

4. The vibration pickup device for a nuclear power plant generator according to claim 2, characterized in that, The adjustment assembly (3) includes a coarse adjustment assembly and a fine adjustment assembly. The first end of the coarse adjustment assembly is screwed or multi-stage clamped to the sleeve (21), and the second end of the coarse adjustment assembly is connected to the fine adjustment assembly.

5. The generator vibration pickup device for a nuclear power plant according to claim 4, characterized in that The second end of the sleeve (21) is provided with a first internal thread (211); the coarse adjustment assembly includes a first locking nut (31) and an adjusting member (32). The first locking nut (31) is provided with a second internal thread opposite to the first internal thread (211). The first end of the adjusting member (32) is provided with a first external thread (321) matching the first internal thread (211) and the second internal thread, and is respectively screwed and fixed to the sleeve (21) and the first locking nut (31). The second end of the adjusting member (32) is connected to the fine adjustment assembly; Alternatively, the second end of the sleeve (21) is provided with a plurality of clamping grooves arranged at intervals along the axial direction of the sleeve (21); the coarse adjustment assembly includes an adjusting member (32), and the first end of the adjusting member (32) is provided with at least one elastic protrusion cooperating with the clamping groove.

6. The generator vibration pickup device of a nuclear power plant according to claim 5, characterized in that, The fine adjustment assembly includes a second locking nut (33) and a boss (34) provided with a third internal thread (341). The boss (34) and the adjusting member (32) are of an integral structure. The second locking nut (33) is provided with a fourth internal thread (331) opposite to the third internal thread (341); The eddy current sensor (5) is provided with a second external thread (51) matching the third internal thread (341) and the fourth internal thread (331), and the eddy current sensor (5) is screwed and fixed to the boss (34) and the second locking nut (33).

7. The generator vibration pickup device of a nuclear power plant according to claim 2, wherein, The support member (1) is provided with an assembly hole (11) and at least two connection holes (12). The sleeve (21) is inserted into the assembly hole (11) and fixedly welded to the assembly hole (11). Each connection hole (12) is connected to the outer side wall of the bearing shell (7) of the generator by a bolt; The abutting surface (13) of the support member (1) abutting against the outer side wall of the bearing shell (7) of the generator is an arc surface.

8. The pick-up device for a nuclear power plant generator according to claim 2, characterized in that, The support member (1) and the sleeve (21) are perpendicular to each other and form an L-shaped structure.

9. The vibration pickup device for a nuclear power plant generator according to any one of claims 3-6, characterized in that, The length of the long right-angle side of the reinforcing rib (22) is 190 mm - 210 mm, the length of the short right-angle side of the reinforcing rib (22) connected to the support member (1) is 35 mm - 45 mm, the wall thickness of the sleeve (21) is 2.9 mm - 3.1 mm, and the thickness of the support member (1) is 18 mm - 22 mm.

10. The vibration pickup device for a nuclear power plant generator according to any one of claims 1-8, characterized in that, The acceleration sensor (4) is fixedly connected to the support member (1) through an insulating member (6).

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