Shaft expansion and cylinder expansion safety measurement system and method for turboset

Abstract

The invention discloses a shaft expansion and cylinder expansion safety measurement system and method for a turboset. The method comprises the following steps: constructing an expansion difference collaborative measurement system between shaft expansion and cylinder expansion; respectively and adaptively monitoring displacement amplitudes of two groups of shaft expansion measuring points of the rotor synchronous with cylinder expansion; comparing and selecting a shaft expansion measuring point with better monitoring performance, and measuring a current distance value between the shaft expansion measuring point and the rotor; according to the monitored synchronous cylinder expansion displacement amplitude and the measured current spacing value, the shaft expansion displacement amplitude of the rotor is obtained through collaborative calculation; the cylinder expansion displacement amplitude of the position, corresponding to the rotor, of the cylinder body is monitored; and calculating the shaft expansion displacement amplitude of the rotor and the cylinder expansion displacement amplitude of the corresponding position of the cylinder body and the rotor, and carrying out difference calculation to obtain a final expansion difference value. The problems that in the prior art, when shaft expansion and cylinder expansion relative expansion difference monitoring is carried out on a steam turbine, the cylinder expansion amplitude synchronism is poor, consequently, the expansion difference calculation accuracy is reduced, a monitoring element is prone to attenuation along with the service life, and consequently the monitoring value deviation of the monitoring element cannot be judged are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring shaft expansion and cylinder expansion of steam turbines, and in particular to a shaft expansion and cylinder expansion safety measurement system and method for steam turbine units. Background Art

[0002] At present, the steam turbine generator set, also known as the steam turbine, is one of the core equipment in thermal power plants and plays an important role in converting thermal energy into electrical energy. As a rotary steam power device, the working principle of the steam turbine is to accelerate high-temperature and high-pressure steam and spray it to the rotor blades, so as to use the pressure difference formed on both sides of the blades to generate lift to drive the rotor to rotate, and then the rotor drives the main shaft connected to the generator transmission to rotate synchronously, thereby transferring kinetic energy to the generator to generate electricity. At the same time, in order to improve the utilization rate of steam, the rotor is usually set to multiple stages, and stators for increasing the kinetic energy speed of steam are alternately provided between the multiple stages of rotors.

[0003] During the actual operation of current steam turbines, due to the heat transfer of steam and the principle of thermal expansion and contraction, the cylinder body and the main shaft will both expand axially to a certain extent based on a relatively static reference position. At the same time, due to the smaller size of the main shaft relative to the cylinder body and the difference in thermal expansion coefficients caused by different manufacturing materials, the axial expansion of the main shaft and the cylinder body will also be different when the temperature in the cylinder changes rapidly, thereby forming a relative expansion difference between the rotor and the cylinder, that is, the expansion difference between the shaft expansion and the cylinder expansion.

[0004] When the expansion difference exceeds the design standard value, the axial clearance between the rotor and the stator in the cylinder may be reduced, which in turn leads to friction between the moving and static parts. This friction will not only damage the surface of the stator and rotor parts, but also cause increased vibration of the turbine. In severe cases, it may cause unit failure or even forced shutdown.

[0005] Therefore, the steam turbine safety monitoring and protection system is often used to measure the difference between the cylinder expansion and shaft expansion of the steam turbine. At present, the steam turbine safety monitoring and protection system mainly includes the monitoring and protection system (TSI), the emergency trip system (ETS) device, and the automatic turning operation device. Among them, the TSI system can continuously monitor various important parameters of the steam turbine, such as speed, overspeed protection, eccentricity, shaft vibration, bearing vibration, shaft displacement, expansion difference, thermal expansion and other parameters, to help operators identify machine failures, so that these failures can be timely shut down the steam turbine generator set before causing serious damage to ensure the safety of the unit.

[0006] In the prior art, please refer to Figure 2When monitoring the differential expansion of a steam turbine, an eddy current sensor is usually installed directly inside the cylinder body, and two sets of eddy current sensors are used to monitor the axial displacement change values ​​(i.e., axial expansion) on both sides of the rotor in a coordinated manner. This allows the eddy current sensor to directly calculate the differential expansion between the rotor and the cylinder based on the synchronous current position cylinder expansion amplitude.

[0007] However, since the cylinder expansion amplitude of each part of the cylinder body based on the reference position is gradually increasing, there is a difference in the basic values ​​formed by the two groups of eddy current sensors when the cylinder expansion amplitude is synchronized, resulting in a decrease in the accuracy of the final expansion difference average calculation result; at the same time, for the eddy current sensors used in the current expansion difference monitoring system, their installation position is usually concealed, and it is difficult to repair and replace them. Therefore, they are usually repaired and replaced after a fixed number of years, and the performance of the electronic components of the sensor will gradually decline with the extension of the service life. Especially after reaching a certain service life, its voltage will decay sharply, and its attenuation degree cannot be effectively determined. This makes it impossible to judge whether the monitoring values ​​within the maintenance cycle are deviant, and protection and control can only rely on the values ​​obtained by monitoring, which is not conducive to the economy and safety of the unit operation. Summary of the invention

[0008] To this end, the present invention provides a safe measurement system and method for shaft expansion and cylinder expansion of a steam turbine unit, so as to solve the technical problems in the prior art that when monitoring the relative expansion difference of shaft expansion and cylinder expansion of a steam turbine, the amplitude synchronization of cylinder expansion is poor, resulting in reduced accuracy of expansion difference calculation, and the monitoring value deviation of the monitoring element cannot be effectively determined due to the characteristic that the monitoring element is easily attenuated with years of use.

[0009] In order to achieve the above object, the present invention provides the following technical solutions:

[0010] A method for safely measuring shaft expansion and cylinder expansion of a steam turbine unit comprises the following steps:

[0011] Construct a synergistic measurement system for the difference between shaft expansion and cylinder expansion;

[0012] Based on the expansion differential synergy measurement system, the displacement amplitude of two groups of shaft expansion measurement points corresponding to the front and rear sides of the rotor are adaptively monitored synchronously with the cylinder expansion.

[0013] Compare and verify the monitoring performance of two groups of shaft expansion measuring points corresponding to the front and rear sides of the rotor, determine at least one group of shaft expansion measuring points whose monitoring performance is more in line with the standard, and measure the current spacing value between the group of shaft expansion measuring points and the rotor;

[0014] The shaft expansion displacement amplitude of the rotor is obtained by collaborative calculation based on the synchronous cylinder expansion displacement amplitude of at least one group of shaft expansion measurement points determined by monitoring and the current spacing value between the synchronous cylinder expansion displacement amplitude and the rotor;

[0015] Based on the expansion differential synergy measurement system, the cylinder expansion displacement amplitude of the corresponding position of the cylinder body and the rotor is monitored;

[0016] The final expansion difference value is obtained by calculating the calculated rotor shaft expansion displacement amplitude and the cylinder expansion displacement amplitude at the corresponding position of the cylinder body and the rotor.

[0017] On the basis of the above technical solution, the present invention is further described as follows:

[0018] As a further embodiment of the present invention,

[0019] The construction of the expansion difference coordination measurement system between shaft expansion and cylinder expansion specifically includes:

[0020] A main shaft and a rotor connected to the main shaft transmission assembly are sequentially arranged corresponding to the inside of the cylinder body, and a static reference position thereof is determined based on the cylinder body;

[0021] The shaft expansion measuring assembly and the cylinder expansion synchronization assembly are respectively fixedly arranged on the inner and outer sides of the cylinder body; the shaft expansion measuring assembly includes a first shaft expansion measuring sensor and a second shaft expansion measuring sensor;

[0022] The first shaft expansion measurement sensor and the second shaft expansion measurement sensor are respectively located at the front and rear sides of the rotor along the main axis direction in a one-to-one correspondence, and the initial measurement distance between the first shaft expansion measurement sensor and the second shaft expansion measurement sensor and the rotor is a;

[0023] The cylinder expansion synchronization assembly comprises a first cylinder expansion synchronization seat, a second cylinder expansion synchronization seat and a transmission connecting rod;

[0024] The first cylinder expansion synchronization seat is synchronously connected with the first shaft expansion measurement sensor through a transmission connecting rod, and the second cylinder expansion synchronization seat is synchronously connected with the second shaft expansion measurement sensor through a transmission connecting rod. The first shaft expansion measurement sensor can synchronize the cylinder expansion displacement amplitude of the first cylinder expansion synchronization seat corresponding to the cylinder body outside, and the second shaft expansion measurement sensor can synchronize the cylinder expansion displacement amplitude of the second cylinder expansion synchronization seat corresponding to the cylinder body outside.

[0025] The first electronic ruler assembly is arranged between the static reference position and the first cylinder expansion synchronization seat, and the cylinder expansion displacement amplitude of the first cylinder expansion synchronization seat is monitored in real time from the outside of the cylinder body by the first electronic ruler assembly, and the second electronic ruler assembly is arranged between the first cylinder expansion synchronization seat and the second cylinder expansion synchronization seat, and the cylinder expansion displacement amplitude of the second cylinder expansion synchronization seat is monitored in real time from the outside of the cylinder body by the second electronic ruler assembly;

[0026] A cylinder expansion measuring point structure is further arranged outside the cylinder body, and the cylinder expansion measuring point structure is arranged relative to the rotor in the initial state in the initial state;

[0027] Continue to set a cylinder expansion measurement component corresponding to the cylinder expansion synchronization component, the cylinder expansion measurement component includes a first cylinder expansion measurement sensor and a second cylinder expansion measurement sensor;

[0028] The first cylinder expansion measurement sensor and the second cylinder expansion measurement sensor are respectively located on the opposite end surfaces between the first cylinder expansion synchronization seat and the second cylinder expansion synchronization seat in a one-to-one correspondence, and the initial measurement distance value between the first cylinder expansion measurement sensor and the second cylinder expansion measurement sensor and the cylinder expansion measurement point structure is b;

[0029] A first performance monitoring component and / or a second performance monitoring component are provided for the shaft expansion measurement component, the first performance monitoring component includes a signal exciter and an oscilloscope, and the first performance monitoring component is electrically connected to the first shaft expansion measurement sensor and the second shaft expansion measurement sensor, respectively, an excitation signal with a gradually increasing frequency is generated by the signal exciter and inputted into the first shaft expansion measurement sensor / the second shaft expansion measurement sensor, and the output signal amplitude and phase information of the first shaft expansion measurement sensor / the second shaft expansion measurement sensor corresponding to the gradually increasing input frequency are observed by the oscilloscope, thereby drawing a frequency response characteristic curve of the first shaft expansion measurement sensor / the second shaft expansion measurement sensor, and comparing it with the frequency response characteristic curve of the normal working state, so as to obtain the performance attenuation degree and relative size of the first shaft expansion measurement sensor and / or the second shaft expansion measurement sensor;

[0030] Two groups of second performance monitoring components are arranged, and the two groups of second performance monitoring components are respectively located at opposite side positions between the first shaft expansion measurement sensor and the second shaft expansion measurement sensor, and each group of second performance monitoring components includes an electric push rod, a first comparison measurement plate and a second comparison measurement plate; the base portion of the electric push rod is fixed to the cylinder body, and the kinetic energy output end portion of the electric push rod is sequentially connected to the first comparison measurement plate and the second comparison measurement plate, the first comparison measurement plate and the second comparison measurement plate are metal measurement plate specimens of different materials, the first comparison measurement plate and the second comparison measurement plate are controlled by telescopic extension of the electric push rod, and the first comparison measurement plate and the second comparison measurement plate sequentially correspond to the first shaft expansion measurement sensor / the second shaft expansion measurement sensor at a fixed distance.

[0031] As a further embodiment of the present invention,

[0032] The expansion differential synergy measurement system adaptively monitors the displacement amplitudes of two groups of shaft expansion measurement points corresponding to the axial front and rear sides of the rotor synchronously with the cylinder expansion, specifically including:

[0033] When cylinder expansion and shaft expansion occur, the cylinder body drives the first cylinder expansion synchronization seat and the second cylinder expansion synchronization seat to adaptively expand and shift respectively. At this time, the first cylinder expansion synchronization seat and the second cylinder expansion synchronization seat drive the first shaft expansion measurement sensor and the second shaft expansion measurement sensor to shift synchronously based on the transmission connecting rod respectively.

[0034] The first electronic ruler assembly adaptively measures the expansion displacement amplitude of the first cylinder expansion synchronization seat from the outside of the cylinder body, that is, the displacement amplitude x1 of the first shaft expansion measurement sensor.

[0035] At the same time, the second electronic measuring ruler component adaptively measures the expansion displacement amplitude of the second cylinder expansion synchronization seat from the outside of the cylinder body, that is, the displacement amplitude x2 of the second shaft expansion measurement sensor.

[0036] As a further embodiment of the present invention,

[0037] The comparison verifies the monitoring performance of two groups of shaft expansion measuring points corresponding to the front and rear sides of the rotor, and determines at least one group of shaft expansion measuring points whose monitoring performance is more in line with the standard, and measures the current spacing value between the two groups and the rotor, specifically including:

[0038] An excitation signal with a linearly increasing frequency is generated by a signal exciter in the first performance monitoring component and is sequentially input into the first shaft expansion measurement sensor / the second shaft expansion measurement sensor, and the output signal amplitude and phase information of the first shaft expansion measurement sensor / the second shaft expansion measurement sensor corresponding to the linearly increasing input frequency are observed by an oscilloscope, and the frequency response characteristic curves of the first shaft expansion measurement sensor and the second shaft expansion measurement sensor are respectively obtained, and compared with the frequency response characteristic curves of the normal working state, respectively, to obtain the performance attenuation degree of the first shaft expansion measurement sensor and the second shaft expansion measurement sensor and their relative size;

[0039] and / or, controlling the electric push rod to output linear kinetic energy to telescopically drive the first comparison measuring plate and the second comparison measuring plate, so that the first comparison measuring plate and the second comparison measuring plate correspond to the first shaft expansion measuring sensor / the second shaft expansion measuring sensor in turn at a fixed distance, and observing the current output signal change of the first shaft expansion measuring sensor / the second shaft expansion measuring sensor corresponding to different measuring plates;

[0040] The sensitivity is calculated by the ratio of the current output signal change to the measurement plate characteristic change, and compared with the initial normal sensitivity, and then the performance attenuation degree and relative size of the first shaft expansion measurement sensor and the second shaft expansion measurement sensor are obtained according to the sensitivity comparison result;

[0041] The synchronous shift amplitude x1 / x2 corresponding to a group of shaft expansion measurement sensors with a performance degradation degree that is relatively more in line with the standards, or the measured current spacing value z1 / z2 between the two groups of shaft expansion measurement sensors with equal performance degradation degrees and both in line with the standards are used as the basic parameters for the subsequent calculation of the expansion difference.

[0042] As a further embodiment of the present invention,

[0043] The synchronous cylinder expansion displacement amplitude of at least one group of shaft expansion measuring points determined by monitoring and the current spacing value between the synchronous cylinder expansion displacement amplitude and the rotor is collaboratively calculated to obtain the shaft expansion displacement amplitude of the rotor, specifically including:

[0044] When it is determined that the first shaft expansion measurement sensor is used for calculation, since the initial measurement distance value between the first shaft expansion measurement sensor and the rotor is a, the shaft expansion displacement amplitude y of the rotor is calculated by the first shaft expansion measurement sensor, and the calculation formula is as follows:

[0045] y=|z1-a+x1| (1)

[0046] Wherein, x1 is the synchronous displacement amplitude measured by the first shaft expansion measurement sensor corresponding to the first cylinder expansion synchronization seat, and z1 is the current spacing value between the first shaft expansion measurement sensor and the rotor;

[0047] When it is determined that the second shaft expansion measurement sensor is used for calculation, since the initial measurement distance value between the second shaft expansion measurement sensor and the rotor is a, the shaft expansion displacement amplitude y of the rotor is calculated by the second shaft expansion measurement sensor, and the calculation formula is as follows:

[0048] y=|a+x2-z2| (2)

[0049] Wherein, x2 is the synchronous displacement amplitude measured by the second shaft expansion measurement sensor corresponding to the second cylinder expansion synchronization seat, and z2 is the current spacing value between the second shaft expansion measurement sensor and the rotor;

[0050] When it is determined that the first shaft expansion measurement sensor and the second shaft expansion measurement sensor perform calculation synchronously, the average of the two groups of calculated shaft expansion displacement amplitudes is taken as the final shaft expansion displacement amplitude y.

[0051] As a further embodiment of the present invention,

[0052] The method of continuing to monitor the cylinder expansion displacement amplitude of the corresponding positions of the cylinder body and the rotor based on the expansion difference synergy measurement system specifically includes:

[0053] Continue to monitor the cylinder expansion state of the cylinder expansion measuring point structure, measure the current distance value c1 between the cylinder expansion measuring point structure and the cylinder expansion measuring point structure by the first cylinder expansion measuring sensor based on the first cylinder expansion synchronization seat, and measure the current distance value c2 between the cylinder expansion measuring point structure and the cylinder expansion measuring point structure by the second cylinder expansion measuring sensor based on the second cylinder expansion synchronization seat;

[0054] At the same time, since the synchronous shift amplitude measured by the first cylinder expansion measuring sensor corresponding to the first cylinder expansion synchronous seat is x1, and the synchronous shift amplitude measured by the second cylinder expansion measuring sensor corresponding to the second cylinder expansion synchronous seat is x2, and the initial measurement spacing values ​​between the first cylinder expansion measuring sensor and the second cylinder expansion measuring sensor and the cylinder expansion measuring point structure respectively correspond to b;

[0055] The cylinder expansion displacement amplitude d of the cylinder expansion measuring point structure is calculated based on this, and the specific calculation formula is as follows:

[0056] c1=b-x1+d

[0057] c2=b-d+x2

[0058] d=|(x1+c1-b+x2+b-c2) / 2| (3).

[0059] As a further embodiment of the present invention,

[0060] The rotor shaft expansion displacement amplitude obtained by calculation and the cylinder expansion displacement amplitude at the corresponding position of the cylinder body and the rotor are calculated and the final expansion difference value is obtained by difference calculation, specifically including:

[0061] The final axial expansion displacement amplitude y of the rotor and the cylinder expansion displacement amplitude d of the cylinder expansion measuring point structure are obtained by calculation, and the final expansion difference value s is obtained by difference calculation. The calculation formula is as follows:

[0062] s=|yd| (4)

[0063] In this way, the final expansion difference value s between the rotor and its corresponding cylinder body position can be accurately measured.

[0064] A measuring system according to a safe measuring method for shaft expansion and cylinder expansion of a steam turbine unit, comprising:

[0065] The measurement system building module is used to build a coordinated measurement system for the difference between shaft expansion and cylinder expansion;

[0066] The shaft expansion measuring point displacement monitoring module is used to adaptively monitor the displacement amplitude of two sets of shaft expansion measuring points corresponding to the front and rear sides of the rotor in synchronization with the cylinder expansion based on the expansion differential synergy measurement system;

[0067] The shaft expansion monitoring and verification module is used to compare and verify the monitoring performance of two groups of shaft expansion measurement points corresponding to the front and rear sides of the rotor, determine at least one group of shaft expansion measurement points whose monitoring performance is more in line with the standard, and measure the current spacing value between the group of shaft expansion measurement points and the rotor;

[0068] A rotor shaft expansion measurement module, used to collaboratively calculate the rotor shaft expansion displacement amplitude according to the synchronous cylinder expansion displacement amplitude of at least one group of shaft expansion measurement points determined by monitoring and the current spacing value between the synchronous cylinder expansion measurement points and the rotor;

[0069] Cylinder expansion measurement module, used to monitor the cylinder expansion displacement amplitude of the corresponding positions of the cylinder body and the rotor based on the expansion difference synergy measurement system;

[0070] The expansion difference calculation module is used to obtain the final expansion difference value by performing a differential calculation based on the calculated rotor shaft expansion displacement amplitude and the cylinder expansion displacement amplitude at the corresponding positions of the cylinder body and the rotor.

[0071] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method when executing the computer program.

[0072] A computer-readable storage medium stores computer program instructions, which, when executed by a processor, implement the method described.

[0073] The present invention has the following beneficial effects:

[0074] This method and system can effectively conduct pre-monitoring verification on the performance attenuation degree of the sensor element located inside the cylinder body, and can determine the optimal sensor monitoring value through comparison. At the same time, it can further calculate the shaft expansion, cylinder expansion and expansion difference values ​​in coordination with the standard monitoring value of the monitoring element outside the cylinder body, thereby significantly improving the accuracy of the expansion difference monitoring, and can effectively determine the attenuation deviation of the monitoring value of the monitoring element, further improving the overall functional stability and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] In order to more clearly illustrate the implementation mode of the present invention or the technical solution in the prior art, the drawings required for the implementation mode or the description of the prior art will be briefly introduced below. The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0076] Figure 1 The present invention provides an overall flow chart of a method for safely measuring shaft expansion and cylinder expansion of a steam turbine unit according to an embodiment of the present invention.

[0077] Figure 2 The present invention is a schematic diagram of a measurement structure for the difference between shaft expansion and cylinder expansion provided in the prior art.

[0078] Figure 3 A schematic diagram of the architecture principle of the expansion difference coordination measurement system in the shaft expansion and cylinder expansion safety measurement method for a steam turbine unit provided in an embodiment of the present invention.

[0079] Figure 4 One of the schematic diagrams of the architecture principle of the expansion difference coordination measurement system corresponding to the shaft expansion and cylinder expansion states in the shaft expansion and cylinder expansion safety measurement method for a steam turbine unit provided in an embodiment of the present invention.

[0080] Figure 5 The second schematic diagram of the architecture principle of the expansion difference coordination measurement system corresponding to the shaft expansion and cylinder expansion states in the shaft expansion and cylinder expansion safety measurement method for a steam turbine unit provided in an embodiment of the present invention.

[0081] Figure 6 A schematic diagram of the architecture principle of the first performance monitoring component corresponding to the expansion difference coordination measurement system in the shaft expansion and cylinder expansion safety measurement method for a steam turbine unit provided in an embodiment of the present invention.

[0082] Figure 7 A schematic diagram of the architecture principle of the second performance monitoring component corresponding to the expansion difference coordination measurement system in the shaft expansion and cylinder expansion safety measurement method for a steam turbine unit provided in an embodiment of the present invention.

[0083] Figure 8 A schematic diagram of the architecture principle of a shaft expansion and cylinder expansion safety measurement system for a steam turbine unit provided in an embodiment of the present invention.

[0084] Fig. 9 The figure is a schematic diagram of the physical structure of an electronic device according to an embodiment of the present invention.

[0085] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0086] Cylinder body 1, main shaft 11, rotor 12, static reference position 13;

[0087] Axle expansion measurement component 2: a first axle expansion measurement sensor 21, a second axle expansion measurement sensor 22;

[0088] Cylinder expansion synchronization assembly 3: first cylinder expansion synchronization seat 31, second cylinder expansion synchronization seat 32, transmission connecting rod 33;

[0089] A first electronic ruler assembly 4; a second electronic ruler assembly 5;

[0090] Cylinder expansion measuring point structure 6;

[0091] Cylinder expansion measuring assembly 7: first cylinder expansion measuring sensor 71, second cylinder expansion measuring sensor 72;

[0092] First performance monitoring component 8: signal exciter 81, oscilloscope 82;

[0093] The second performance monitoring component 9: an electric push rod 91, a first comparison and measurement plate 92, and a second comparison and measurement plate 93;

[0094] Measurement system construction module 10; shaft expansion measurement point displacement monitoring module 20; shaft expansion monitoring verification module 30; rotor shaft expansion measurement module 40; cylinder expansion measurement module 50; expansion difference measurement module 60;

[0095] Electronic device 70 : processor 701 , memory 702 , internal bus 703 . DETAILED DESCRIPTION

[0096] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0097] The terms such as "upper", "lower", "left", "right", and "middle" used in this specification are only for the convenience of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships should be regarded as within the scope of the invention without substantially changing the technical content.

[0098] like Figure 1 As shown, the embodiment of the present invention provides a safe measurement method for shaft expansion and cylinder expansion of a steam turbine unit, which can effectively perform pre-monitoring verification on the performance attenuation degree of the sensor element located inside the cylinder body 1, and can determine the optimal sensor monitoring value by comparison, and can further combine the standard monitoring value of the monitoring element outside the cylinder body 1 to calculate the shaft expansion, cylinder expansion and expansion difference values, thereby significantly improving the accuracy of expansion difference monitoring, and can effectively determine the monitoring value attenuation deviation of the monitoring element, further improving the overall functional practicality. Specifically including the following steps:

[0099] S1: Please refer to Figure 3 , Figure 6 and Figure 7 , build a synergistic measurement system for the difference between shaft expansion and cylinder expansion;

[0100] The specific process is as follows: a main shaft 11 and a rotor 12 connected to the main shaft 11 are sequentially arranged inside the cylinder body 1, and a static reference position 13 thereof is determined based on the cylinder body 1;

[0101] The shaft expansion measuring assembly 2 and the cylinder expansion synchronization assembly 3 are respectively fixedly arranged on the inner and outer sides of the cylinder body 1; wherein the shaft expansion measuring assembly 2 includes a first shaft expansion measuring sensor 21 and a second shaft expansion measuring sensor 22; the first shaft expansion measuring sensor 21 and the second shaft expansion measuring sensor 22 are respectively located on the front and rear sides of the rotor 12 along the main shaft 11 in a one-to-one correspondence, and the initial measurement spacing values ​​between the first shaft expansion measuring sensor 21 and the second shaft expansion measuring sensor 22 and the rotor 12 are a;

[0102] The cylinder expansion synchronization assembly 3 includes a first cylinder expansion synchronization seat 31, a second cylinder expansion synchronization seat 32 and a transmission connecting rod 33; wherein the first cylinder expansion synchronization seat 31 is synchronously connected with the first shaft expansion measurement sensor 21 through the transmission connecting rod 33, and the second cylinder expansion synchronization seat 32 is synchronously connected with the second shaft expansion measurement sensor 22 through the transmission connecting rod 33, so that the first shaft expansion measurement sensor 21 can synchronize the cylinder expansion displacement amplitude of the first cylinder expansion synchronization seat 31 corresponding to the outside of the cylinder body 1, and at the same time, the second shaft expansion measurement sensor 22 can synchronize the cylinder expansion displacement amplitude of the second cylinder expansion synchronization seat 32 corresponding to the outside of the cylinder body 1;

[0103] The first electronic ruler assembly 4 is driven and arranged between the static reference position 13 and the first cylinder expansion synchronization seat 31, so as to monitor the cylinder expansion displacement amplitude of the first cylinder expansion synchronization seat 31 in real time from the outside of the cylinder body 1 through the first electronic ruler assembly 4; and the second electronic ruler assembly 5 is driven and arranged between the first cylinder expansion synchronization seat 31 and the second cylinder expansion synchronization seat 32, so as to monitor the further cylinder expansion displacement amplitude of the second cylinder expansion synchronization seat 32 in real time from the outside of the cylinder body 1 through the second electronic ruler assembly 5;

[0104] A cylinder expansion measuring point structure 6 is further provided outside the cylinder body 1, and the cylinder expansion measuring point structure 6 is provided in a relative position to the rotor 12 in the initial state in the initial state;

[0105] Continuing to set a cylinder expansion measurement component 7 corresponding to the cylinder expansion synchronization component 3, the cylinder expansion measurement component 7 includes a first cylinder expansion measurement sensor 71 and a second cylinder expansion measurement sensor 72, the first cylinder expansion measurement sensor 71 and the second cylinder expansion measurement sensor 72 are respectively located in one-to-one correspondence between the first cylinder expansion synchronization seat 31 and the second cylinder expansion synchronization seat 32 facing each other, and the initial measurement distance value between the first cylinder expansion measurement sensor 71 and the second cylinder expansion measurement sensor 72 and the cylinder expansion measurement point structure 6 is b;

[0106] A first performance monitoring component 8 and / or a second performance monitoring component 9 are provided for the shaft expansion measurement component 2, wherein the first performance monitoring component 8 comprises a signal exciter 81 and an oscilloscope 82, and the first performance monitoring component 8 is electrically connected to the first shaft expansion measurement sensor 21 and the second shaft expansion measurement sensor 22 respectively, an excitation signal with a gradually increasing frequency is generated by the signal exciter 81 and inputted into the first shaft expansion measurement sensor 21 / the second shaft expansion measurement sensor 22, and the output signal amplitude and phase information of the first shaft expansion measurement sensor 21 / the second shaft expansion measurement sensor 22 corresponding to the gradually increasing input frequency are observed by the oscilloscope 82, so as to draw a frequency response characteristic curve of the first shaft expansion measurement sensor 21 / the second shaft expansion measurement sensor 22, and compare it with the frequency response characteristic curve of the normal working state, so as to obtain the performance attenuation degree and relative size of the first shaft expansion measurement sensor 21 and / or the second shaft expansion measurement sensor 22;

[0107] Two groups of second performance monitoring components 9 are provided, and the two groups of second performance monitoring components 9 are respectively located at the opposite side positions between the first shaft expansion measurement sensor 21 and the second shaft expansion measurement sensor 22, and each group of second performance monitoring components 9 includes an electric push rod 91, a first comparison measurement plate 92 and a second comparison measurement plate 93; the base of the electric push rod 91 is fixed to the cylinder body 1, and the kinetic energy output end of the electric push rod 91 is sequentially connected to the first comparison measurement plate 92 and the second comparison measurement plate 93 by transmission, and the first comparison measurement plate 92 and the second comparison measurement plate 93 are metal measurement plate specimens of different materials, which are used to extend the electric push rod 91. The first comparison measuring plate 92 and the second comparison measuring plate 93 are controlled to correspond to the first shaft expansion measuring sensor 21 / the second shaft expansion measuring sensor 22 in sequence under a fixed distance state, and the current output signal change of the first shaft expansion measuring sensor 21 / the second shaft expansion measuring sensor 22 is observed, and the sensitivity is calculated by the ratio of the current output signal change to the measurement plate characteristic change, and compared with the initial normal sensitivity, and then the performance attenuation degree and relative size of the first shaft expansion measuring sensor 21 and / or the second shaft expansion measuring sensor 22 are obtained according to the sensitivity comparison result;

[0108] S2: Please refer to Figures 3 to 5 Based on the expansion differential synergy measurement system, the displacement amplitude of two groups of shaft expansion measurement points corresponding to the axial front and rear sides of the rotor 12 is adaptively monitored synchronously with the cylinder expansion;

[0109] The specific process is as follows: when cylinder expansion and shaft expansion occur, the cylinder body 1 drives the first cylinder expansion synchronization seat 31 and the second cylinder expansion synchronization seat 32 to expand and shift adaptively respectively. At this time, the first cylinder expansion synchronization seat 31 and the second cylinder expansion synchronization seat 32 drive the first shaft expansion measurement sensor 21 and the second shaft expansion measurement sensor 22 to shift synchronously based on the transmission connecting rod 33 respectively, and the first electronic ruler component 4 adaptively measures the expansion displacement amplitude of the first cylinder expansion synchronization seat 31 from the outside of the cylinder body 1, that is, the displacement amplitude x1 of the first shaft expansion measurement sensor 21, and at the same time, the second electronic ruler component 5 adaptively measures the expansion displacement amplitude of the second cylinder expansion synchronization seat 32 from the outside of the cylinder body 1, that is, the displacement amplitude x2 of the second shaft expansion measurement sensor 22;

[0110] S3: Please refer to Figure 6 and Figure 7 , compare and verify the monitoring performance of two groups of shaft expansion measuring points corresponding to the axial front and rear sides of the rotor 12, and determine at least one group of shaft expansion measuring points whose monitoring performance is more in line with the standard, and measure the current spacing value between the shaft expansion measuring points and the rotor 12;

[0111] The specific process is as follows: the signal exciter 81 in the first performance monitoring component 8 generates an excitation signal with a linearly increasing frequency, which is sequentially input into the first shaft expansion measurement sensor 21 / the second shaft expansion measurement sensor 22, and the output signal amplitude and phase information of the first shaft expansion measurement sensor 21 / the second shaft expansion measurement sensor 22 corresponding to the linearly increasing input frequency are observed by the oscilloscope 82, so as to respectively draw and obtain the frequency response characteristic curves of the first shaft expansion measurement sensor 21 and the second shaft expansion measurement sensor 22, and respectively compare them with the frequency response characteristic curves of the normal working state, so as to obtain the performance attenuation degree and relative size of the first shaft expansion measurement sensor 21 and the second shaft expansion measurement sensor 22;

[0112] And / or, control the electric push rod 91 to output linear kinetic energy to telescopically drive the first comparison measuring plate 92 and the second comparison measuring plate 93, so that the first comparison measuring plate 92 and the second comparison measuring plate 93 correspond to the first shaft expansion measuring sensor 21 / the second shaft expansion measuring sensor 22 in turn at a fixed distance, and observe the current output signal change of the first shaft expansion measuring sensor 21 / the second shaft expansion measuring sensor 22 corresponding to different measuring plates;

[0113] The sensitivity is calculated by the ratio of the current output signal change to the measurement plate characteristic change, and compared with the initial normal sensitivity, and then the performance attenuation degree and relative size of the first shaft expansion measurement sensor 21 and the second shaft expansion measurement sensor 22 are obtained according to the sensitivity comparison result;

[0114] The synchronous shift amplitude x1 / x2 corresponding to a group of shaft expansion measurement sensors with a relatively higher performance degradation degree that meets the standard, or the synchronous shift amplitude x1 / x2 and the current spacing value z1 / z2 measured between the sensors and the rotor 12 are used as basic parameters for subsequent calculation of the expansion difference;

[0115] S4: according to the synchronous cylinder expansion displacement amplitude of at least one group of shaft expansion measurement points determined by monitoring and the current spacing value between the synchronous cylinder expansion measurement points and the rotor 12, the shaft expansion displacement amplitude of the rotor 12 is obtained by cooperative calculation;

[0116] The specific process is: Please continue to refer to Figure 4 When it is determined that the first shaft expansion measurement sensor 21 is used for calculation, since the initial measurement distance value between the first shaft expansion measurement sensor 21 and the rotor 12 is a, the shaft expansion displacement amplitude y of the rotor 12 is calculated by the first shaft expansion measurement sensor 21, and the calculation formula is as follows:

[0117] y=|z1-a+x1| (1)

[0118] Wherein, x1 is the synchronous displacement amplitude measured by the first shaft expansion measuring sensor 21 corresponding to the first cylinder expansion synchronous seat 31, and z1 is the current spacing value between the first shaft expansion measuring sensor 21 and the rotor 12;

[0119] Please continue to refer to Figure 5 When it is determined that the second shaft expansion measurement sensor 22 is used for calculation, since the initial measurement distance value between the second shaft expansion measurement sensor 22 and the rotor 12 is a, the shaft expansion displacement amplitude y of the rotor 12 is calculated by the second shaft expansion measurement sensor 22, and the calculation formula is as follows:

[0120] y=|a+x2-z2| (2)

[0121] Wherein, x2 is the synchronous displacement amplitude measured by the second shaft expansion measuring sensor 22 corresponding to the second cylinder expansion synchronous seat 32, and z2 is the current spacing value between the second shaft expansion measuring sensor 22 and the rotor 12;

[0122] When it is determined that the first shaft expansion measurement sensor 21 and the second shaft expansion measurement sensor 22 perform calculations synchronously, the average of the two groups of calculated shaft expansion displacement amplitudes is taken as the final shaft expansion displacement amplitude y;

[0123] S5: Continue to monitor the cylinder expansion displacement amplitude at the corresponding positions of the cylinder body 1 and the rotor 12 based on the expansion difference synergy measurement system;

[0124] The specific process is: Please continue to refer to Figures 3 to 5, continue to monitor the cylinder expansion state of the cylinder expansion measuring point structure 6, measure the current distance value c1 between it and the cylinder expansion measuring point structure 6 based on the first cylinder expansion synchronization seat 31 through the first cylinder expansion measuring sensor 71, and measure the current distance value c2 between it and the cylinder expansion measuring point structure 6 based on the second cylinder expansion synchronization seat 32 through the second cylinder expansion measuring sensor 72;

[0125] At the same time, since the synchronous displacement amplitude measured by the first cylinder expansion measurement sensor 71 corresponding to the first cylinder expansion synchronization seat 31 is x1, and the synchronous displacement amplitude measured by the second cylinder expansion measurement sensor 72 corresponding to the second cylinder expansion synchronization seat 32 is x2, and the initial measurement spacing values ​​between the first cylinder expansion measurement sensor 71 and the second cylinder expansion measurement sensor 72 and the cylinder expansion measurement point structure 6 are both b;

[0126] The cylinder expansion displacement amplitude d of the cylinder expansion measuring point structure 6 is calculated in this way, and the specific calculation formula is as follows:

[0127] c1=b-x1+d

[0128] c2=b-d+x2

[0129] d=|(x1+c1-b+x2+b-c2) / 2| (3)

[0130] S6: The calculated axial expansion displacement amplitude of the rotor 12 and the cylinder expansion displacement amplitude of the corresponding position of the cylinder body 1 and the rotor 12 are used to obtain a final expansion difference value by performing a difference calculation;

[0131] The specific process is: the final axial expansion displacement amplitude y of the rotor 12 and the cylinder expansion displacement amplitude d of the cylinder expansion measuring point structure 6 are obtained by calculation, and the final expansion difference value s is obtained by difference calculation. The calculation formula is as follows:

[0132] s=|yd| (4)

[0133] In this way, the final expansion difference value s between the rotor 12 and its corresponding cylinder body 1 position is accurately measured.

[0134] like Figure 8 As shown, the embodiment of the present invention further provides a measurement system according to the above-mentioned shaft expansion and cylinder expansion safety measurement method for a steam turbine unit, specifically comprising:

[0135] The measurement system construction module 10 is used to construct a measurement system for the synergy of the expansion difference between the shaft expansion and the cylinder expansion;

[0136] The shaft expansion measuring point displacement monitoring module 20 is used to adaptively monitor the displacement amplitude of two groups of shaft expansion measuring points corresponding to the axial front and rear sides of the rotor in synchronization with the cylinder expansion based on the expansion difference synergy measurement system;

[0137] The shaft expansion monitoring and verification module 30 is used to compare and verify the monitoring performance of two groups of shaft expansion measurement points corresponding to the front and rear sides of the rotor, determine at least one group of shaft expansion measurement points whose monitoring performance is more in line with the standard, and measure the current spacing value between the group of shaft expansion measurement points and the rotor;

[0138] The rotor shaft expansion calculation module 40 is used to collaboratively calculate the rotor shaft expansion displacement amplitude according to the synchronous cylinder expansion displacement amplitude of at least one group of shaft expansion measurement points determined by monitoring and the current spacing value between the synchronous cylinder expansion measurement points and the rotor;

[0139] The cylinder expansion measurement module 50 is used to monitor the cylinder expansion displacement amplitude of the corresponding positions of the cylinder body and the rotor based on the expansion difference synergy measurement system;

[0140] The expansion difference calculation module 60 is used to obtain a final expansion difference value by performing a differential calculation based on the calculated rotor shaft expansion displacement amplitude and the cylinder expansion displacement amplitude at the corresponding position of the cylinder body and the rotor.

[0141] Fig. 9 FIG. 1 is a schematic diagram of the physical structure of an electronic device according to an embodiment of the present invention. Fig. 9 As shown, the electronic device 70 includes: a processor 701 (processor), a memory 702 (memory) and an internal bus 703; wherein the processor 701 and the memory 702 communicate with each other through the internal bus 703;

[0142] The processor 701 is used to call the program instructions in the memory 702 to execute the methods provided by the above-mentioned method embodiments, for example, including: constructing a synergistic measurement system for the expansion difference between shaft expansion and cylinder expansion; based on the expansion difference synergistic measurement system, adaptively monitoring the displacement amplitudes of two groups of shaft expansion measurement points corresponding to the axial front and rear sides of the rotor synchronized with the cylinder expansion; comparing and verifying the monitoring performance of the two groups of shaft expansion measurement points corresponding to the axial front and rear sides of the rotor, determining at least one group of shaft expansion measurement points whose monitoring performance is more in line with the standard, and measuring the current spacing value between it and the rotor; synergistically calculating the shaft expansion displacement amplitude of the rotor according to the synchronous cylinder expansion displacement amplitude of at least one group of shaft expansion measurement points determined by monitoring and the measured current spacing value between it and the rotor; monitoring the cylinder expansion displacement amplitude of the corresponding positions of the cylinder body and the rotor based on the expansion difference synergistic measurement system; and obtaining the final expansion difference value by difference calculation based on the calculated rotor shaft expansion displacement amplitude and the cylinder expansion displacement amplitude of the corresponding positions of the cylinder body and the rotor.

[0143] The present embodiment provides a non-transitory computer-readable storage medium, which stores computer instructions. The computer instructions enable a computer to execute the methods provided by the above-mentioned method embodiments, for example, including: constructing a synergistic measurement system for the expansion difference between shaft expansion and cylinder expansion; adaptively monitoring the displacement amplitudes of two groups of shaft expansion measurement points corresponding to the axial front and rear sides of the rotor in synchronization with the cylinder expansion based on the expansion difference synergistic measurement system; comparing and verifying the monitoring performance of the two groups of shaft expansion measurement points corresponding to the axial front and rear sides of the rotor, determining at least one group of shaft expansion measurement points whose monitoring performance is more in line with the standard, and measuring the current spacing value between it and the rotor; synergistically calculating the shaft expansion displacement amplitude of the rotor based on the synchronous cylinder expansion displacement amplitude of at least one group of shaft expansion measurement points determined by monitoring and the measured current spacing value between it and the rotor; monitoring the cylinder expansion displacement amplitudes at the corresponding positions of the cylinder body and the rotor based on the expansion difference synergistic measurement system; and obtaining the final expansion difference value by difference calculation based on the calculated rotor shaft expansion displacement amplitude and the cylinder expansion displacement amplitude at the corresponding positions of the cylinder body and the rotor.

[0144] A person skilled in the art can understand that all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, etc., various storage media that can store program codes.

[0145] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0146] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, or of course by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0147] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A method for measuring shaft expansion and cylinder expansion safety for a steam turbine unit, characterized in that: The steps include: Construct a synergistic measurement system for the difference between shaft expansion and cylinder expansion; Based on the expansion differential synergy measurement system, the displacement amplitude of two groups of shaft expansion measurement points corresponding to the front and rear sides of the rotor are adaptively monitored synchronously with the cylinder expansion. Compare and verify the monitoring performance of two groups of shaft expansion measuring points corresponding to the front and rear sides of the rotor, determine at least one group of shaft expansion measuring points whose monitoring performance is more in line with the standard, and measure the current spacing value between the group of shaft expansion measuring points and the rotor; The shaft expansion displacement amplitude of the rotor is obtained by collaborative calculation based on the synchronous cylinder expansion displacement amplitude of at least one group of shaft expansion measurement points determined by monitoring and the current spacing value between the synchronous cylinder expansion displacement amplitude and the rotor; Based on the expansion differential synergy measurement system, the cylinder expansion displacement amplitude of the corresponding position of the cylinder body and the rotor is monitored; The final expansion difference value is obtained by calculating the calculated rotor shaft expansion displacement amplitude and the cylinder expansion displacement amplitude at the corresponding position of the cylinder body and the rotor.

2. The method for measuring shaft expansion and cylinder expansion safety for a steam turbine unit according to claim 1 is characterized in that: The construction of the expansion difference coordination measurement system between shaft expansion and cylinder expansion specifically includes: A main shaft and a rotor connected to the main shaft transmission assembly are sequentially arranged corresponding to the inside of the cylinder body, and a static reference position thereof is determined based on the cylinder body; The shaft expansion measuring assembly and the cylinder expansion synchronization assembly are respectively fixedly arranged on the inner and outer sides of the cylinder body; the shaft expansion measuring assembly includes a first shaft expansion measuring sensor and a second shaft expansion measuring sensor; The first shaft expansion measurement sensor and the second shaft expansion measurement sensor are respectively located at the front and rear sides of the rotor along the main axis direction in a one-to-one correspondence, and the initial measurement distance between the first shaft expansion measurement sensor and the second shaft expansion measurement sensor and the rotor is a; The cylinder expansion synchronization assembly comprises a first cylinder expansion synchronization seat, a second cylinder expansion synchronization seat and a transmission connecting rod; The first cylinder expansion synchronization seat is synchronously connected with the first shaft expansion measurement sensor through a transmission connecting rod, and the second cylinder expansion synchronization seat is synchronously connected with the second shaft expansion measurement sensor through a transmission connecting rod. The first shaft expansion measurement sensor can synchronize the cylinder expansion displacement amplitude of the first cylinder expansion synchronization seat corresponding to the cylinder body outside, and the second shaft expansion measurement sensor can synchronize the cylinder expansion displacement amplitude of the second cylinder expansion synchronization seat corresponding to the cylinder body outside. The first electronic ruler assembly is arranged between the static reference position and the first cylinder expansion synchronization seat, and the cylinder expansion displacement amplitude of the first cylinder expansion synchronization seat is monitored in real time from the outside of the cylinder body by the first electronic ruler assembly, and the second electronic ruler assembly is arranged between the first cylinder expansion synchronization seat and the second cylinder expansion synchronization seat, and the cylinder expansion displacement amplitude of the second cylinder expansion synchronization seat is monitored in real time from the outside of the cylinder body by the second electronic ruler assembly; A cylinder expansion measuring point structure is further arranged outside the cylinder body, and the cylinder expansion measuring point structure is arranged relative to the rotor in the initial state in the initial state; Continue to set a cylinder expansion measurement component corresponding to the cylinder expansion synchronization component, the cylinder expansion measurement component includes a first cylinder expansion measurement sensor and a second cylinder expansion measurement sensor; The first cylinder expansion measurement sensor and the second cylinder expansion measurement sensor are respectively located on the opposite end surfaces between the first cylinder expansion synchronization seat and the second cylinder expansion synchronization seat in a one-to-one correspondence, and the initial measurement distance value between the first cylinder expansion measurement sensor and the second cylinder expansion measurement sensor and the cylinder expansion measurement point structure is b; A first performance monitoring component and / or a second performance monitoring component are provided for the shaft expansion measurement component, the first performance monitoring component includes a signal exciter and an oscilloscope, and the first performance monitoring component is electrically connected to the first shaft expansion measurement sensor and the second shaft expansion measurement sensor, respectively, an excitation signal with a gradually increasing frequency is generated by the signal exciter and inputted into the first shaft expansion measurement sensor / the second shaft expansion measurement sensor, and the output signal amplitude and phase information of the first shaft expansion measurement sensor / the second shaft expansion measurement sensor corresponding to the gradually increasing input frequency are observed by the oscilloscope, thereby drawing a frequency response characteristic curve of the first shaft expansion measurement sensor / the second shaft expansion measurement sensor, and comparing it with the frequency response characteristic curve of the normal working state, so as to obtain the performance attenuation degree and relative size of the first shaft expansion measurement sensor and / or the second shaft expansion measurement sensor; Two groups of second performance monitoring components are arranged, and the two groups of second performance monitoring components are respectively located at opposite side positions between the first shaft expansion measurement sensor and the second shaft expansion measurement sensor, and each group of second performance monitoring components includes an electric push rod, a first comparison measurement plate and a second comparison measurement plate; the base portion of the electric push rod is fixed to the cylinder body, and the kinetic energy output end portion of the electric push rod is sequentially connected to the first comparison measurement plate and the second comparison measurement plate, the first comparison measurement plate and the second comparison measurement plate are metal measurement plate specimens of different materials, the first comparison measurement plate and the second comparison measurement plate are controlled by telescopic extension of the electric push rod, and the first comparison measurement plate and the second comparison measurement plate sequentially correspond to the first shaft expansion measurement sensor / the second shaft expansion measurement sensor at a fixed distance.

3. The method for measuring shaft expansion and cylinder expansion safety for a steam turbine unit according to claim 2 is characterized in that: The differential expansion synergy measurement system adaptively monitors the displacement amplitudes of two groups of shaft expansion measurement points corresponding to the front and rear axial sides of the rotor in synchronization with the cylinder expansion, specifically including: When cylinder expansion and shaft expansion occur, the cylinder body drives the first cylinder expansion synchronization seat and the second cylinder expansion synchronization seat to adaptively expand and shift respectively. At this time, the first cylinder expansion synchronization seat and the second cylinder expansion synchronization seat drive the first shaft expansion measurement sensor and the second shaft expansion measurement sensor to shift synchronously based on the transmission connecting rod respectively. The first electronic ruler assembly adaptively measures the expansion displacement amplitude of the first cylinder expansion synchronization seat from the outside of the cylinder body, that is, the displacement amplitude x1 of the first shaft expansion measurement sensor. At the same time, the second electronic measuring ruler component adaptively measures the expansion displacement amplitude of the second cylinder expansion synchronization seat from the outside of the cylinder body, that is, the displacement amplitude x2 of the second shaft expansion measurement sensor.

4. The method for measuring shaft expansion and cylinder expansion safety for a steam turbine unit according to claim 3 is characterized in that: The comparison verifies the monitoring performance of two groups of shaft expansion measuring points corresponding to the front and rear sides of the rotor, and determines at least one group of shaft expansion measuring points whose monitoring performance is more in line with the standard, and measures the current spacing value between the two groups and the rotor, specifically including: An excitation signal with a linearly increasing frequency is generated by a signal exciter in the first performance monitoring component and is sequentially input into the first shaft expansion measurement sensor / the second shaft expansion measurement sensor, and the output signal amplitude and phase information of the first shaft expansion measurement sensor / the second shaft expansion measurement sensor corresponding to the linearly increasing input frequency are observed by an oscilloscope, and the frequency response characteristic curves of the first shaft expansion measurement sensor and the second shaft expansion measurement sensor are respectively obtained, and compared with the frequency response characteristic curves of the normal working state, respectively, to obtain the performance attenuation degree of the first shaft expansion measurement sensor and the second shaft expansion measurement sensor and their relative size; and / or, controlling the electric push rod to output linear kinetic energy to telescopically drive the first comparison measuring plate and the second comparison measuring plate, so that the first comparison measuring plate and the second comparison measuring plate correspond to the first shaft expansion measuring sensor / the second shaft expansion measuring sensor in turn at a fixed distance, and observing the current output signal change of the first shaft expansion measuring sensor / the second shaft expansion measuring sensor corresponding to different measuring plates; The sensitivity is calculated by the ratio of the current output signal change to the measurement plate characteristic change, and compared with the initial normal sensitivity, and then the performance attenuation degree and relative size of the first shaft expansion measurement sensor and the second shaft expansion measurement sensor are obtained according to the sensitivity comparison result; The synchronous shift amplitude x1 / x2 corresponding to a group of shaft expansion measurement sensors with a performance degradation degree that is relatively more in line with the standards, or the measured current spacing value z1 / z2 between the two groups of shaft expansion measurement sensors with equal performance degradation degrees and both in line with the standards are used as the basic parameters for the subsequent calculation of the expansion difference.

5. The method for measuring shaft expansion and cylinder expansion safety for a steam turbine unit according to claim 4 is characterized in that: The synchronous cylinder expansion displacement amplitude of at least one group of shaft expansion measuring points determined by monitoring and the current spacing value between the synchronous cylinder expansion displacement amplitude and the rotor is collaboratively calculated to obtain the shaft expansion displacement amplitude of the rotor, specifically including: When it is determined that the first shaft expansion measurement sensor is used for calculation, since the initial measurement distance value between the first shaft expansion measurement sensor and the rotor is a, the shaft expansion displacement amplitude y of the rotor is calculated by the first shaft expansion measurement sensor, and the calculation formula is as follows: y=|z1-a+x1| (1) Wherein, x1 is the synchronous displacement amplitude measured by the first shaft expansion measurement sensor corresponding to the first cylinder expansion synchronization seat, and z1 is the current spacing value between the first shaft expansion measurement sensor and the rotor; When it is determined that the second shaft expansion measurement sensor is used for calculation, since the initial measurement distance value between the second shaft expansion measurement sensor and the rotor is a, the shaft expansion displacement amplitude y of the rotor is calculated by the second shaft expansion measurement sensor, and the calculation formula is as follows: y=|a+x2-z2| (2) Wherein, x2 is the synchronous displacement amplitude measured by the second shaft expansion measurement sensor corresponding to the second cylinder expansion synchronization seat, and z2 is the current spacing value between the second shaft expansion measurement sensor and the rotor; When it is determined that the first shaft expansion measurement sensor and the second shaft expansion measurement sensor perform calculation synchronously, the average of the two groups of calculated shaft expansion displacement amplitudes is taken as the final shaft expansion displacement amplitude y.

6. The method for measuring shaft expansion and cylinder expansion safety for a steam turbine unit according to claim 5 is characterized in that: The method of continuing to monitor the cylinder expansion displacement amplitude of the corresponding positions of the cylinder body and the rotor based on the expansion difference synergy measurement system specifically includes: Continue to monitor the cylinder expansion state of the cylinder expansion measuring point structure, measure the current distance value c1 between the cylinder expansion measuring point structure and the cylinder expansion measuring point structure by the first cylinder expansion measuring sensor based on the first cylinder expansion synchronization seat, and measure the current distance value c2 between the cylinder expansion measuring point structure and the cylinder expansion measuring point structure by the second cylinder expansion measuring sensor based on the second cylinder expansion synchronization seat; At the same time, since the synchronous shift amplitude measured by the first cylinder expansion measuring sensor corresponding to the first cylinder expansion synchronous seat is x1, and the synchronous shift amplitude measured by the second cylinder expansion measuring sensor corresponding to the second cylinder expansion synchronous seat is x2, and the initial measurement spacing values ​​between the first cylinder expansion measuring sensor and the second cylinder expansion measuring sensor and the cylinder expansion measuring point structure respectively correspond to b; The cylinder expansion displacement amplitude d of the cylinder expansion measuring point structure is calculated based on this, and the specific calculation formula is as follows: c1=b-x1+d c2=b-d+x2 d=|(x1+c1-b+x2+b-c2) / 2| (3).

7. The method for measuring shaft expansion and cylinder expansion safety for a steam turbine unit according to claim 6 is characterized in that: The rotor shaft expansion displacement amplitude obtained by calculation and the cylinder expansion displacement amplitude at the corresponding position of the cylinder body and the rotor are calculated and the final expansion difference value is obtained by difference calculation, specifically including: The final axial expansion displacement amplitude y of the rotor and the cylinder expansion displacement amplitude d of the cylinder expansion measuring point structure are obtained by calculation, and the final expansion difference value s is obtained by difference calculation. The calculation formula is as follows: s=|yd| (4) In this way, the final expansion difference value s between the rotor and its corresponding cylinder body position can be accurately measured.

8. A measuring system for the safe measurement method of shaft expansion and cylinder expansion of a steam turbine unit according to any one of claims 1 to 7, characterized in that: include: The measurement system building module is used to build a coordinated measurement system for the difference between shaft expansion and cylinder expansion; The shaft expansion measuring point displacement monitoring module is used to adaptively monitor the displacement amplitude of two sets of shaft expansion measuring points corresponding to the front and rear sides of the rotor in synchronization with the cylinder expansion based on the expansion differential synergy measurement system; The shaft expansion monitoring and verification module is used to compare and verify the monitoring performance of two groups of shaft expansion measurement points corresponding to the front and rear sides of the rotor, determine at least one group of shaft expansion measurement points whose monitoring performance is more in line with the standard, and measure the current spacing value between the group of shaft expansion measurement points and the rotor; A rotor shaft expansion measurement module, used to collaboratively calculate the rotor shaft expansion displacement amplitude according to the synchronous cylinder expansion displacement amplitude of at least one group of shaft expansion measurement points determined by monitoring and the current spacing value between the synchronous cylinder expansion measurement points and the rotor; Cylinder expansion measurement module, used to monitor the cylinder expansion displacement amplitude of the corresponding positions of the cylinder body and the rotor based on the expansion difference synergy measurement system; The expansion difference calculation module is used to obtain the final expansion difference value by performing a differential calculation based on the calculated rotor shaft expansion displacement amplitude and the cylinder expansion displacement amplitude at the corresponding positions of the cylinder body and the rotor.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the method described in any one of claims 1 to 7 is implemented.

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