Steam turbine vibration detection device

Abstract

The invention discloses a steam turbine vibration detection device, and belongs to the technical field of vibration detection. The device comprises a detection table and an upper sealing shell arranged on the detection table in a buckled mode, a swing assembly is movably embedded in the detection table, a steam turbine rotor is placed on the swing assembly, a blade tip timing sensor is further arranged in the detection table, and position adjusting assemblies are fixedly arranged on the side walls of the two ends of the detection table correspondingly; a supporting assembly is arranged beside the detection table, a cage type universal joint and a driving assembly are fixedly arranged on the supporting assembly, a plurality of fine adjustment assemblies are fixedly arranged on the driving assembly, and the steam turbine rotor detection device has the advantages that the probability that a steam turbine rotor is damaged in the detection process is reduced, vibration is reduced, and the detection precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration detection, and in particular relates to a steam turbine vibration detection device. Background Art

[0002] A steam turbine is a steam-powered device that generates power by driving blades to rotate with high-temperature and high-pressure steam. Steam turbines have the disadvantages of large single-unit power, high efficiency and long life. Steam turbines are widely used in various fields, such as the metallurgical industry, marine equipment, chemical industry and power generation. During the operation of the steam turbine, the turbine blades will vibrate. Therefore, after the steam turbine has been running for a period of time, it is necessary to use a vibration detection device to perform vibration detection on the turbine blades to prevent the blades from vibrating too much and causing increased wear of the steam turbine.

[0003] Chinese patent CN118443142B discloses a vibration detection device for turbine blades, including a detection mechanism, the detection mechanism includes a detection platform, and a closed shell arranged on the detection platform, the inner wall of the detection platform and the inner wall of the closed shell are both provided with blade tip timing sensors distributed in a circumferential manner; a turbine rotor, which is arranged on the detection platform and placed between the detection platform and the closed shell; a locking mechanism, which includes a support seat fixedly arranged on the outer wall of the detection platform, and a support shaft fixedly arranged on the top of the support seat, the outer wall of the support shaft is rotatably connected with a clamping block, and also includes a counterweight block fixedly arranged on the outer wall of the clamping block, and a support pad is provided on the support seat; a hoisting mechanism, the closed shell in the invention can automatically form a clamping connection with the detection platform after the hoisting is completed, and the disassembly operation is simple, which is convenient for taking out the turbine rotor.

[0004] Although the vibration detection device for turbine blades proposed in the above-mentioned prior art can automatically form a snap connection with the test bench after the closed shell is hoisted to achieve the effect of simplifying the operation, the vibration detection device proposed in the above-mentioned prior art will experience varying degrees of wear at multiple snap connection locations between the closed shell and the test bench after a long period of opening and closing, which will cause the closed shell and the test bench to be unable to fit tightly after being snapped together. This will cause the turbine blades to deviate during the rotation process for vibration detection, which will aggravate the wear between the shaft of the turbine blade and the closed shell and the test bench. Moreover, it can be seen from the diagram of the above-mentioned patent document that the turbine blades are fixedly connected to an external drive assembly during vibration detection. If the external drive assembly vibrates, the vibration will be transmitted to the turbine blades, which will cause inaccurate vibration detection results, making the detection results have no reference significance.

[0005] Therefore, we propose a steam turbine vibration detection device to solve the above-mentioned problems. Summary of the invention

[0006] In view of the problem in the prior art that the closed shell and the test bench cannot be tightly fitted after being clamped, which causes the turbine blades to deviate during the rotation for vibration detection, thereby aggravating the wear between the shaft of the turbine blade and the closed shell and the test bench, in addition to this, it also solves the problem that when the turbine blades are subjected to vibration detection, they are fixedly connected to an external drive assembly. If the external drive assembly vibrates, the vibration will be transmitted to the turbine blades, resulting in inaccurate vibration detection results. The purpose of the present invention is to provide a turbine vibration detection device.

[0007] In order to solve the above problems, the technical solution adopted by the present invention is as follows: a steam turbine vibration detection device, comprising a detection platform and an upper closed shell snap-fitted on the detection platform, the detection platform and the upper closed shell are fixed by a snap-fit ​​assembly, a swing assembly is movably embedded in the detection platform, a steam turbine rotor is placed on the swing assembly, a blade tip timing sensor is also arranged inside the detection platform, adjustment assemblies are fixedly arranged on the side walls at both ends of the detection platform, a support assembly is arranged on one side of the detection platform, a cage universal joint and a drive assembly are fixedly arranged on the support assembly, and a plurality of fine-tuning assemblies are fixedly arranged on the drive assembly.

[0008] Furthermore, the detection platform includes a plurality of legs, and a lower sealing shell is fixedly mounted on the upper ends of the plurality of legs, and the lower sealing shell and the upper sealing shell are fixed by a buckle assembly.

[0009] Furthermore, the lower closed shell includes a shell fixedly installed on the upper end of the support leg, and the shell is respectively provided with mounting groove 1, mounting groove 2 and a pair of mounting grooves 3, mounting groove 3 is respectively connected with mounting groove 1 and mounting groove 2, and two pairs of circular grooves are opened inside the mounting groove 2.

[0010] Furthermore, the swing assembly includes a swing arm movably arranged inside the second mounting groove, a plurality of mounting columns are fixedly installed on the side wall of the swing arm, and the mounting columns are rotatably installed in the inner cavity of the circular groove at one end away from the swing arm, and an arc-shaped mounting plate 1 is fixedly installed on the cross beams at both ends of the swing arm, respectively, and an arc-shaped mounting plate 2 is threadedly installed on the first arc-shaped mounting plate, and two pairs of elastic push rods are fixedly installed on the bottom surface of the inner cavity of the second mounting groove, the two pairs of elastic push rods are symmetrically arranged, and the tops of the two pairs of elastic push rods are in conflict with the bottom wall of the swing arm.

[0011] Furthermore, the steam turbine rotor comprises a main shaft and blades fixedly mounted on the circumferential side wall of the main shaft, and mounting plates are fixedly connected to both ends of the main shaft.

[0012] Furthermore, the positioning assembly includes load-bearing plates respectively fixedly mounted on the side walls at both ends of the shell, and the electric push rod and the balance detection assembly are respectively fixedly mounted on the top wall of the load-bearing plates.

[0013] Furthermore, the balance detection component includes an electromagnet 1 fixedly mounted on the top surface of the load-bearing plate, a pair of limit columns are also fixedly mounted on the top surface of the load-bearing plate, a lifting sleeve is slidably sleeved on the two limit columns, a permanent magnet 1 is fixedly mounted on the bottom surface of the lifting sleeve, the electromagnet 1 and the permanent magnet 1 are aligned, a detection rod is slidably embedded in the inner cavity of the lifting sleeve, the detection rod and the lifting sleeve are elastically connected by a spring 1, and a pressure sensor is fixedly mounted on the side wall of the inner cavity of the lifting sleeve.

[0014] Furthermore, the support assembly includes a plurality of support columns, and a load-bearing platform is fixedly installed on the top surfaces of the plurality of support columns; The cage universal joint comprises a pair of brackets fixedly mounted on the top surface of the load-bearing platform, on which a universal joint body is mounted for common rotation, and two ends of the universal joint body are respectively fixedly connected with a connecting plate 1 and a connecting plate 2, and the connecting plate 1 is fixedly connected to the mounting plate.

[0015] Furthermore, the driving assembly includes a pair of mounting frames fixedly mounted on the top surface of the load-bearing platform, a motor is fixedly mounted on the two mounting frames, a conductor rotor is fixedly connected to the output end of the motor, a permanent magnet rotor is fixedly mounted on the side wall of the second connection plate, and the conductor rotor and the permanent magnet rotor are concentrically arranged; The permanent magnet rotor comprises a permanent magnet rotor body, and a receiving plate is fixedly sleeved on the circumferential outer wall of the permanent magnet rotor body.

[0016] Furthermore, the fine-tuning assembly includes a plurality of fixed blocks fixedly mounted on the circumferential outer wall of the conductor rotor, a load-bearing rod fixedly mounted on the side wall of the fixed block, an electromagnet 2 is embedded and fixedly mounted at the far end of the load-bearing rod, a clamping block is also embedded and slidably mounted at the far end of the load-bearing rod, a permanent magnet 2 is fixedly mounted on the inner side wall of the clamping block, the permanent magnet 2 is aligned with the electromagnet 2, the clamping block and the load-bearing rod are elastically connected by a spring 2, and a laser emitter is also fixedly mounted on the side wall of the fixed block.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by providing a swing assembly, even when the upper sealing shell and the lower sealing shell are not installed and tightened and the turbine rotor is slightly offset, the main shaft will always rotate on the swing assembly, and the main shaft will not directly collide and rub against the inner wall of the installation groove three and the inner wall of the upper sealing shell, thereby reducing the probability of damage to the turbine rotor during the detection process.

[0018] 2. The present invention can restore the non-concentric conductor rotor and permanent magnet rotor to a concentric state again during operation through the coordinated arrangement of the fine-tuning component, the laser transmitter and the receiving board, thereby reducing the generation of vibration. The motor can then be powered off and vibration detection can be performed after maintenance is completed, thereby reducing the probability of damage to the turbine rotor due to vibration.

[0019] 3. The conductor rotor and the permanent magnet rotor in the present invention transmit power through magnetic coupling, which is a contactless power transmission. Therefore, the vibration generated by the motor will not be transmitted to the turbine rotor, and will not affect the effect of vibration detection, which is conducive to improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 A magnified image of point A; Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention from another angle; Figure 4 It is a schematic diagram of the installation position of the elastic push rod of the present invention; Figure 5 It is a disassembly schematic diagram of the lower sealing shell and the upper sealing shell of the present invention; Figure 6 It is a disassembled schematic diagram of the lower sealing shell, the swing assembly and the turbine rotor of the present invention; Figure 7 It is a three-dimensional structural schematic diagram of the swing assembly of the present invention; Figure 8 It is a schematic cross-sectional view of the overall structure of the present invention; Fig. 9 for Figure 8 A magnified view of point B; Fig.10 for Figure 8 Enlarged view of point C; Fig.11 for Fig.10 The enlarged view of point D; Fig.12 Another cross-sectional view of the overall structure of the present invention; Fig.13 for Fig.12 The enlarged view of point E; Fig.14 It is a disassembly schematic diagram of the cage universal joint and the drive assembly of the present invention; Fig.15 It is a three-dimensional structural schematic diagram of the fine-tuning component of the present invention; Fig.16 for Fig.15 Enlarged view of point F.

[0021] In the figure: 1. test bench; 11. support leg; 12. lower closed shell; 121. shell; 122. mounting slot 1; 123. mounting slot 2; 124. round slot; 125. mounting slot 3; 2. upper closed shell; 3. snap-fit ​​assembly; 4. swing assembly; 41. swing arm; 42. mounting column; 43. arc-shaped mounting plate 1; 44. arc-shaped mounting plate 2; 45. elastic push rod; 5. turbine rotor; 51. main shaft; 52. blade; 53. mounting plate; 6. blade tip timing sensor; 7. adjustment assembly; 71. load-bearing plate; 72. electric push rod; 73. balance detection assembly; 731. electromagnet 1; 732. permanent magnet 1; 733. lifting sleeve; 7 34. Detection rod; 735. Spring 1; 736. Pressure sensor; 737. Limit column; 8. Support assembly; 81. Support column; 82. Load-bearing platform; 9. Cage universal joint; 91. Bracket; 92. Universal joint body; 93. Connecting plate 1; 94. Connecting plate 2; 10. Drive assembly; 101. Mounting frame; 102. Motor; 103. Conductor rotor; 104. Permanent magnet rotor; 1041. Permanent magnet rotor body; 1042. Receiving plate; 20. Fine-tuning assembly; 201. Fixing block; 202. Load-bearing rod; 203. Electromagnet 2; 204. Clamping block; 205. Permanent magnet 2; 206. Spring 2; 207. Laser transmitter. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with specific embodiments.

[0023] To solve the problem that the lower sealing shell 12 and the upper sealing shell 2 cannot be tightly fitted after being buckled, resulting in the turbine rotor 5 being offset during the rotation of the turbine rotor 5 for vibration detection, aggravating the collision and friction between the main shaft 51 of the turbine rotor 5 and the inner wall of the installation groove 3 125 and the inner wall of the upper sealing shell 2, as shown in FIG. Figure 1 - Fig. 9 So and Figure 12-13 Show: A steam turbine vibration detection device comprises a detection platform 1 and an upper closed shell 2 which is buckled and arranged on the detection platform 1. The detection platform 1 and the upper closed shell 2 are fixed by a buckling component 3. During the detection process, the detection platform 1, the upper closed shell 2 and the buckling component 3 are matched and arranged so that the detection platform 1 and the upper closed shell 2 form a relatively closed space, thereby reducing the interference of external factors on the detection results during the detection process, which is conducive to improving the accuracy of the detection results. A swing component 4 is movably arranged inside the detection platform 1, and a steam turbine rotor 5 is placed on the swing component 4. After a long time and multiple openings and closings, the buckling component 3 will inevitably wear out, which will cause the detection platform 1 and the upper closed shell to be damaged. After the closed shell 2 is buckled, its firmness is reduced, causing the upper closed shell 2 to shake on the test bench 1. When the upper closed shell 2 and the test bench 1 are not firmly installed, the turbine rotor 5 may be offset during the rotation test. Since the turbine rotor 5 is placed on the swing assembly 4, and since the swing assembly 4 is embedded in the interior of the test bench 1, when the turbine rotor 5 is offset, it will synchronously drive the swing assembly 4 to rotate. Since the swing assembly 4 limits the turbine rotor 5, when the turbine rotor 5 is offset, the turbine rotor 5 will not directly collide and rub with the test bench 1 and the upper closed shell 2, thereby reducing the probability of damage to the turbine rotor 5 during the test.

[0024] A blade tip timing sensor 6 is also provided inside the test bench 1. The blade tip timing sensor 6 is a contactless vibration sensor used to detect the vibration degree of the turbine rotor 5. It belongs to the prior art and will not be described in detail here. Adjustment components 7 are fixedly provided on the side walls at both ends of the test bench 1. When the turbine rotor 5 is placed on the swing component 4, the turbine rotor 5 is not necessarily in a balanced state. The unbalanced turbine rotor 5 can be adjusted to a balanced state through the adjustment component 7, which is beneficial to subsequent detection. A support component 8 is provided on one side of the test bench 1 for supporting and fixing the components. The support components 8 are respectively A cage universal joint 9 and a drive assembly 10 are fixedly arranged. The cage universal joint 9 is used to realize power transmission, and the drive assembly 10 is used to realize power output. A plurality of fine-tuning assemblies 20 are fixedly arranged on the drive assembly 10. Since the drive assembly 10 adopts magnetic coupling for power transmission, the entire drive assembly 10 must be in a concentric state to be able to output power smoothly, otherwise vibration and unsmooth power output will occur. The setting of the fine-tuning assembly 20 is used to always keep the entire drive assembly 10 in a concentric state to prevent the vibration caused by the eccentricity from being transmitted to the turbine rotor 5 and affecting the detection result.

[0025] The testing platform 1 comprises a plurality of legs 11 , and a lower sealing shell 12 is fixedly mounted on the upper ends of the plurality of legs 11 . The lower sealing shell 12 and the upper sealing shell 2 are fixed by a buckle assembly 3 .

[0026] The lower closed shell 12 includes a shell 121 fixedly mounted on the upper end of the support leg 11, and the shell 121 is respectively provided with a mounting groove 122, a mounting groove 2 123 and a pair of mounting grooves 3 125, and the mounting groove 3 125 is respectively connected with the mounting groove 1 122 and the mounting groove 2 123, and two pairs of circular grooves 124 are respectively provided inside the mounting groove 2 123. Before the steam turbine rotor 5 is detected, the steam turbine rotor 5 will be set in the mounting groove 1 122, and the blade tip timing sensor 6 is also set in the inner cavity of the mounting groove 1 122, so as to detect the vibration degree of the steam turbine rotor 5.

[0027] The swing assembly 4 includes a swing arm 41 movably arranged inside the second mounting groove 123. The shape of the second mounting groove 123 is consistent with the shape of the swing arm 41, and the volume of the inner cavity of the second mounting groove 123 is larger than the volume of the swing arm 41, so that the swing arm 41 can swing in the inner cavity of the second mounting groove 123. A plurality of mounting columns 42 are fixedly installed on the side wall of the swing arm 41. The end of the mounting column 42 away from the swing arm 41 is rotatably installed in the inner cavity of the circular groove 124. An arc-shaped mounting plate 1 43 is fixedly installed on the cross beams at both ends of the swing arm 41, and an arc-shaped mounting plate 2 44 is threadedly installed on the arc-shaped mounting plate 1 43. Two pairs of elastic top rods 45 are fixedly installed on the bottom surface of the inner cavity of the second mounting groove 123. The two pairs of elastic top rods 45 are symmetrically arranged, and the tops of the two pairs of elastic top rods 45 are in conflict with the bottom wall of the swing arm 41, so as to maintain the balanced state of the swing arm 41 in the initial state.

[0028] The steam turbine rotor 5 includes a main shaft 51 and blades 52 fixedly mounted on the circumferential side wall of the main shaft 51 . Mounting plates 53 are fixedly connected to both ends of the main shaft 51 .

[0029] The positioning assembly 7 includes load-bearing plates 71 respectively fixedly mounted on the side walls at both ends of the shell 121, and electric push rods 72 and balance detection assemblies 73 are respectively fixedly mounted on the top walls of the load-bearing plates 71. After the steam turbine rotor 5 is placed on the arc-shaped mounting plate 1 43, the balance detection assembly 73 is started to detect the balance of the steam turbine rotor 5. If the balance is qualified, the staff directly installs the arc-shaped mounting plate 2 44 back on the arc-shaped mounting plate 1 43 to limit the main shaft 51.

[0030] The balance detection component 73 includes an electromagnet 731 fixedly mounted on the top surface of the load-bearing plate 71, and a pair of limit columns 737 are also fixedly mounted on the top surface of the load-bearing plate 71. A lifting sleeve 733 is slidably sleeved on the two limit columns 737. A permanent magnet 732 is fixedly mounted on the bottom surface of the lifting sleeve 733. The electromagnet 731 and the permanent magnet 732 are aligned. A detection rod 734 is slidably embedded in the inner cavity of the lifting sleeve 733. The detection rod 734 is elastically connected to the lifting sleeve 733 by a spring 735. A pressure sensor 736 is fixedly mounted on the side wall of the inner cavity of the lifting sleeve 733.

[0031] Specifically, in the initial state, the setting of the elastic push rod 45 will make the swing arm 41, the arc-shaped mounting plate 1 43 and the arc-shaped mounting plate 2 44 in a balanced state. Before the vibration detection of the steam turbine rotor 5 is performed, the snap-fit ​​assembly 3 is first opened, the upper sealing shell 2 is removed from the lower sealing shell 12, and then the arc-shaped mounting plate 2 44 is removed from the arc-shaped mounting plate 1 43, and the steam turbine rotor 5 is placed on the arc-shaped mounting plate 1 43 as a whole. At this time, the blades 52 are correspondingly located inside the mounting groove 122, and the two ends of the main shaft 51 are located on the arc-shaped mounting plate 1 43. At this time, the electromagnet 1 731 is energized, so that there is a repulsive force between the electromagnet 1 731 and the permanent magnet 1 732. Under the action of the repulsive force, the permanent magnet 1 732 will push the lifting sleeve 733 to slide upward on the limit column 737. During the upward sliding process of the lifting sleeve 733, the detection rod 734 will be driven to move upward synchronously through the spring 1 735. When it moves to the set position, the repulsive force between the electromagnet 1 731 and the permanent magnet 1 732 is controlled to remain unchanged, thereby positioning the lifting sleeve 733 and the detection rod 734. At this time, if the detection rods 734 at both ends of the lower closed shell 12 are not in contact with the pressure sensor 736, it means that the turbine rotor 5 is in a balanced state on the arc mounting plate 1 43. Then, the arc mounting plate 2 44 can be installed back on the arc mounting plate 1 43 to limit the main shaft 51, and then subsequent vibration detection operations can be performed.

[0032] If one of the detection rods 734 contacts the pressure sensor 736, it means that the turbine rotor 5 is not in a balanced state on the arc-shaped mounting plate 43. At this time, the electric push rods 72 at both ends of the starting shell 121 are alternately lifted on the two ends of the main shaft 51 to adjust the posture of the turbine rotor 5 on the arc-shaped mounting plate 43. When the turbine rotor 5 is adjusted to be in a balanced state, the staff continues to install the arc-shaped mounting plate 44 back on the arc-shaped mounting plate 43 to limit the main shaft 51. If the turbine rotor 5 is still not in a balanced state after a long period of adjustment, the control will alarm and the staff will handle it. The adjustment component 7 can ensure that the turbine rotor 5 is in a balanced state after installation, which is not only conducive to the smooth progress of the detection, but also conducive to improving the detection accuracy.

[0033] Furthermore, after the steam turbine rotor 5 is successfully installed on the arc-shaped mounting plate 1 43 and the arc-shaped mounting plate 2 44, the upper closed shell 2 is covered on the top wall of the lower closed shell 12. At this time, the bottom wall of the upper closed shell 2 will contact the top wall of the swing arm 41. Under the elastic force of the elastic push rod 45, the swing arm 41, the arc-shaped mounting plate 1 43, the arc-shaped mounting plate 2 44 and the steam turbine rotor 5 will be pressed against the bottom wall of the upper closed shell 2 in a balanced posture. After the upper closed shell 2 and the lower closed shell 12 are fixed by the snap-fit ​​assembly 3, the vibration detection of the steam turbine rotor 5 can be started.

[0034] After a long time and multiple openings and closings, the buckling assembly 3 will inevitably wear out, which will cause the lower sealing shell 12 and the upper sealing shell 2 to be buckled, and the firmness will be reduced, so that the upper sealing shell 2 will shake on the lower sealing shell 12. When the upper sealing shell 2 and the lower sealing shell 12 are not firmly installed, the elastic push rod 45 and the shaking upper sealing shell 2 cannot maintain the balance of the swing assembly 4 and the turbine rotor 5 during the rotation of the turbine rotor 5, which may cause the turbine rotor 5 to slightly deviate during the rotation detection. Since the turbine rotor 5 is placed on the arc-shaped mounting plate 1 43 and the arc-shaped mounting plate 2 44, and since the swing arm 41 is rotatably mounted inside the circular groove 124 through the mounting column 42, and the arc-shaped mounting plate 1 43 and the arc-shaped mounting plate 2 44 form a circular ring The diameter is smaller than the diameter of the mounting groove three 125, which makes the outer walls of the arc-shaped mounting plate 1 43 and the arc-shaped mounting plate 2 44 not contact the inner wall of the mounting groove three 125, and further makes the mounting groove three 125 not interfere with the rotation of the arc-shaped mounting plate 1 43 and the arc-shaped mounting plate 2 44. When the steam turbine rotor 5 is slightly offset, it will synchronously drive the swing arm 41, the arc-shaped mounting plate 1 43 and the arc-shaped mounting plate 2 44 to rotate. Since the arc-shaped mounting plate 1 43 and the arc-shaped mounting plate 2 44 limit the main shaft 51 of the steam turbine rotor 5, when the steam turbine rotor 5 is offset, the main shaft 51 will always rotate on the swing assembly 4, so that the main shaft 51 of the steam turbine rotor 5 will not directly collide and rub with the inner wall of the mounting groove three 125 and the inner wall of the upper closed shell 2.

[0035] In the existing steam turbine vibration detection device, the inner wall of the mounting groove three 125 is arranged to fit with the main shaft 51, which plays a role of limiting the main shaft 51 to ensure that the steam turbine rotor 5 will not deviate during the rotation detection process. However, with this arrangement, when the upper sealing shell 2 and the lower sealing shell 12 are not installed and tightened, the steam turbine rotor 5 may slightly deviate during the rotation process, which will cause the main shaft 51 to collide and rub with the inner wall of the mounting groove three 125 and the inner wall of the upper sealing shell 2, which will not only affect the detection effect, but also aggravate the wear of the main shaft 51, the mounting groove three 125 and the upper sealing shell 2. In the present invention, by setting the swing assembly 4, even if the upper sealing shell 2 and the lower sealing shell 12 are not installed and tightened and the steam turbine rotor 5 is slightly deviated, the main shaft 51 will always rotate on the swing assembly 4, and the main shaft 51 will not directly collide and rub with the inner wall of the mounting groove three 125 and the inner wall of the upper sealing shell 2, thereby reducing the probability of damage to the steam turbine rotor 5 during the detection process.

[0036] In order to solve the problem that the existing steam turbine rotor 5 is fixedly connected to the external drive assembly 10 during vibration detection, if the external drive assembly 10 vibrates, the vibration will be transmitted to the steam turbine rotor 5, resulting in inaccurate vibration detection results, such as Figure 8 - Fig.11 and Figure 14-16 As shown: The support assembly 8 includes a plurality of support columns 81 , and a load-bearing platform 82 is fixedly mounted on the top surfaces of the plurality of support columns 81 .

[0037] The cage universal joint 9 includes a pair of brackets 91 fixedly mounted on the top surface of the load-bearing platform 82, and a universal joint body 92 is mounted on the two brackets 91 for common rotation. The two ends of the universal joint body 92 are respectively fixedly connected to a connecting plate 1 93 and a connecting plate 2 94, and the connecting plate 1 93 is fixedly connected to the mounting plate 53.

[0038] The driving assembly 10 includes a pair of mounting frames 101 fixedly mounted on the top surface of the load-bearing platform 82, and a motor 102 is fixedly mounted on the two mounting frames 101. The output end of the motor 102 is fixedly connected to a conductor rotor 103, and a permanent magnet rotor 104 is fixedly mounted on the side wall of the connecting disk 94. The conductor rotor 103 and the permanent magnet rotor 104 are concentrically arranged.

[0039] The permanent magnet rotor 104 comprises a permanent magnet rotor body 1041 , and a receiving plate 1042 is fixedly sleeved on the circumferential outer wall of the permanent magnet rotor body 1041 .

[0040] The fine-tuning assembly 20 includes a plurality of fixed blocks 201 fixedly mounted on the circumferential outer wall of the conductor rotor 103, a load-bearing rod 202 fixedly mounted on the side wall of the fixed block 201, an electromagnet 203 is embedded and fixedly mounted at the distal end of the load-bearing rod 202, a clamping block 204 is also embedded and slidably mounted at the distal end of the load-bearing rod 202, a permanent magnet 205 is fixedly mounted on the inner side wall of the clamping block 204, the permanent magnet 205 is aligned with the electromagnet 203, the clamping block 204 and the load-bearing rod 202 are elastically connected by a spring 206, and a laser emitter 207 is also fixedly mounted on the side wall of the fixed block 201.

[0041] Specifically, after the steam turbine rotor 5 is installed, in the initial state, the conductor rotor 103, the permanent magnet rotor 104, the second connection disk 94, the first connection disk 93, the installation disk 53 and the main shaft 51 are concentrically arranged, and the starting motor 102 drives the conductor rotor 103 to rotate. Since the conductor rotor 103 and the permanent magnet rotor 104 are coupled by magnetic force, when the conductor rotor 103 rotates, it will synchronously drive the permanent magnet rotor 104 to rotate. The permanent magnet rotor 104 will then drive the main shaft 51 and the blades 52 to rotate synchronously through the second connection disk 94, the universal joint body 92, the first connection disk 93 and the installation disk 53, and then the vibration of the blade 52 is detected by the blade tip timing sensor 6. Since the conductor rotor 103 and the permanent magnet rotor 104 are coupled by magnetic force, which is a contactless power transmission, the vibration generated by the motor 102 will not be transmitted to the steam turbine rotor 5, and will not affect the effect of vibration detection, which is conducive to improving the detection accuracy.

[0042] After a long period of operation, when the wear gap between the bracket 91 and the universal joint body 92 becomes larger, the conductor rotor 103, the permanent magnet rotor 104, the connecting plate 2 94, the connecting plate 1 93, the mounting plate 53 and the main shaft 51 will be misaligned and no longer in a concentric state. Since the universal joint body 92 has a steering effect, it will not affect the power transmission between the universal joint body 92 and the connecting plate 1 93. However, when the conductor rotor 103 and the permanent magnet rotor 104 are not concentric, the magnetic field between the conductor rotor 103 and the permanent magnet rotor 104 will be unstable. During operation, the vibration of the cage universal joint 9 will be aggravated, and the generated vibration will be transmitted to the turbine rotor 5, which will not only affect the detection result, but also may cause vibration damage to the turbine rotor 5.

[0043] When the receiving plate 1042 cannot receive the laser beam emitted by the laser transmitter 207, it is determined that the conductor rotor 103 and the permanent magnet rotor 104 are not concentric. At this time, the electromagnet 203 is energized to generate a repulsive force between the electromagnet 203 and the permanent magnet 205, and the clamping block 204 is extended in the direction close to the permanent magnet rotor 104. The permanent magnet rotor 104 is clamped by multiple clamping blocks 204, so that the conductor rotor 103 and the permanent magnet rotor 104 are restored to a concentric state again, reducing the generation of vibration, and then the motor 102 is powered off, and vibration detection is performed after the maintenance is completed.

[0044] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam turbine vibration detection device, comprising a detection platform (1) and an upper sealing shell (2) buckled onto the detection platform (1), wherein the detection platform (1) and the upper sealing shell (2) are fixed by a buckling assembly (3), characterized in that: The testing platform (1) is provided with a swing assembly (4) movably embedded therein, a steam turbine rotor (5) being placed on the swing assembly (4), a blade tip timing sensor (6) being further provided therein, a positioning assembly (7) being fixedly provided on the side walls at both ends of the testing platform (1), a support assembly (8) being provided on one side of the testing platform (1), a cage universal joint (9) and a drive assembly (10) being fixedly provided on the support assembly (8), and a plurality of fine adjustment assemblies (20) being fixedly provided on the drive assembly (10).

2. A steam turbine vibration detection device according to claim 1, characterized in that: The testing platform (1) comprises a plurality of supporting legs (11), a lower sealing shell (12) being fixedly mounted on the upper ends of the plurality of supporting legs (11), and the lower sealing shell (12) and the upper sealing shell (2) are fixed via a buckling assembly (3).

3. A steam turbine vibration detection device according to claim 2, characterized in that: The lower closed shell (12) comprises a shell (121) fixedly mounted on the upper end of the support leg (11); the shell (121) is provided with a first mounting groove (122), a second mounting groove (123) and a pair of third mounting grooves (125); the third mounting groove (125) is connected to the first mounting groove (122) and the second mounting groove (123), respectively; and the second mounting groove (123) is provided with two pairs of circular grooves (124) inside.

4. A steam turbine vibration detection device according to claim 3, characterized in that: The swing assembly (4) comprises a swing arm (41) movably arranged inside the second mounting groove (123), a plurality of mounting posts (42) being fixedly mounted on the side wall of the swing arm (41), one end of the mounting post (42) away from the swing arm (41) being rotatably mounted in the inner cavity of the circular groove (124), an arc-shaped mounting plate (43) being fixedly mounted on the two end cross beams of the swing arm (41), an arc-shaped mounting plate (43) being threadedly mounted on the arc-shaped mounting plate (43), and two pairs of elastic push rods (45) being fixedly mounted on the bottom surface of the inner cavity of the second mounting groove (123), the two pairs of elastic push rods (45) being symmetrically arranged, and the tops of the two pairs of elastic push rods (45) both abut against the bottom wall of the swing arm (41).

5. A steam turbine vibration detection device according to claim 1, characterized in that: The steam turbine rotor (5) comprises a main shaft (51) and blades (52) fixedly mounted on the circumferential side wall of the main shaft (51), and mounting plates (53) are respectively fixedly connected to both ends of the main shaft (51).

6. A steam turbine vibration detection device according to claim 3, characterized in that: The position adjustment component (7) comprises load-bearing plates (71) respectively fixedly mounted on the side walls at both ends of the housing (121), and an electric push rod (72) and a balance detection component (73) are respectively fixedly mounted on the top wall of the load-bearing plate (71).

7. A steam turbine vibration detection device according to claim 6, characterized in that: The balance detection assembly (73) comprises an electromagnet (731) fixedly mounted on the top surface of the load-bearing plate (71); a pair of limit columns (737) are also fixedly mounted on the top surface of the load-bearing plate (71); a lifting sleeve (733) is slidably sleeved on the two limit columns (737); a permanent magnet (732) is fixedly mounted on the bottom surface of the lifting sleeve (733); the electromagnet (731) and the permanent magnet (732) are aligned; a detection rod (734) is slidably mounted in the inner cavity of the lifting sleeve (733); the detection rod (734) is elastically connected to the lifting sleeve (733) via a spring (735); and a pressure sensor (736) is fixedly mounted on the side wall of the inner cavity of the lifting sleeve (733).

8. A steam turbine vibration detection device according to claim 5, characterized in that: The support assembly (8) comprises a plurality of support columns (81), and a load-bearing platform (82) is fixedly mounted on the top surfaces of the plurality of support columns (81); The cage-type universal joint (9) comprises a pair of brackets (91) fixedly mounted on the top surface of the load-bearing platform (82), a universal joint body (92) being mounted on the two brackets (91) for co-rotation, a connecting plate 1 (93) and a connecting plate 2 (94) being fixedly connected at both ends of the universal joint body (92), and the connecting plate 1 (93) is fixedly connected to the mounting plate (53).

9. A steam turbine vibration detection device according to claim 8, characterized in that: The driving assembly (10) comprises a pair of mounting frames (101) fixedly mounted on the top surface of the load-bearing platform (82), a motor (102) being fixedly mounted on both mounting frames (101), a conductor rotor (103) being fixedly connected to an output end of the motor (102), a permanent magnet rotor (104) being fixedly mounted on a side wall of the second connection plate (94), and the conductor rotor (103) and the permanent magnet rotor (104) being arranged concentrically; The permanent magnet rotor (104) comprises a permanent magnet rotor body (1041), and a receiving plate (1042) is fixedly sleeved on the circumferential outer wall of the permanent magnet rotor body (1041).

10. A steam turbine vibration detection device according to claim 9, characterized in that: The fine-tuning assembly (20) comprises a plurality of fixed blocks (201) fixedly mounted on the circumferential outer wall of the conductor rotor (103); a load-bearing rod (202) is fixedly mounted on the side wall of the fixed block (201); a second electromagnet (203) is embedded and fixedly mounted at the far end of the load-bearing rod (202); a clamping block (204) is also embedded and slidably mounted at the far end of the load-bearing rod (202); a second permanent magnet (205) is fixedly mounted on the inner side wall of the clamping block (204); the second permanent magnet (205) and the second electromagnet (203) are aligned; the clamping block (204) and the load-bearing rod (202) are elastically connected via a second spring (206); and a laser emitter (207) is also fixedly mounted on the side wall of the fixed block (201).

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