A test device for a steam turbine structural component

Abstract

The present application relates to the technical field of steam turbine testing, and particularly relates to a steam turbine structural component testing device, which comprises a dynamic balance testing machine, one side of the dynamic balance testing machine is provided with a testing shaft, the surface of the testing shaft is provided with a nut through screw connection, the outer wall of the testing shaft is welded with a limiting ring, and the inside of the testing shaft is provided with a cylinder, and the inside of the cylinder on one side of the testing shaft is provided with an air storage cylinder, the compressed gas in the cylinder pushes the slide rod fixing impeller and the nut through the connecting pipe, drives the clamping plate to clamp the side surface of the nut, prevents radial displacement and nut loosening, a high-pressure gas pump is started, the airflow is divided by the flow divider and enters the nozzle A in the protective cover to form a protective gas film, cooperates with the magnet to adsorb impurities and blows them to the collecting box, forms a spiral airflow at the nozzle B to remove the impurities on the surface of the magnet, and the airflow impacts the baffle to drive the magnetic ring and the circular plate to move, converts into a pulling force on the supporting plate, enhances the clamping force, and guarantees the accuracy of the dynamic balance testing data.

Description

Technical Field

[0001] This invention relates to the field of steam turbine testing technology, and in particular to a testing device for steam turbine structural components. Background Technology

[0002] In the field of steam turbine manufacturing and maintenance, performance testing of steam turbine structural components is a key step to ensure the safe and efficient operation of steam turbines. Dynamic balancing test, as one of the important test items, is mainly used to detect the balance status of rotating components such as steam turbine impellers, so as to promptly detect and correct any imbalances that may occur during the manufacturing or use of the components.

[0003] Currently, when conducting dynamic balancing tests on turbine structural components, it is usually necessary to fix components such as impellers on a test shaft, and then use a dynamic balancing testing machine to rotate the test shaft in order to test the balance performance of the components.

[0004] However, since the testing process often takes a long time, the test shaft will generate strong vibrations when rotating at high speed. Under the action of this continuous vibration, the nut used to fix the impeller to the shaft is prone to loosening, which will change the balance of the components during the test, resulting in inaccurate test results and affecting the correct evaluation of the performance of the turbine structural components.

[0005] In view of this, this paper studies and improves the existing problems, and provides a testing device for steam turbine structural components. The aim of this technology is to solve the problems and improve its practical value. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies by proposing a testing device for turbine structural components. This invention uses a cylinder to compress gas, which, via connecting pipes A and B, pushes a sliding rod to fix the impeller and nut, and drives a clamping plate to hold the side of the nut, preventing radial displacement and nut loosening. A high-pressure air pump is activated, and the airflow is distributed through a distributor plate to nozzle A, forming a protective air film within the protective cover. This film, combined with a magnet, attracts impurities and blows them towards a collection box. At nozzle B, a spiral airflow is formed, removing impurities from the magnet surface. Furthermore, the airflow impacts a baffle, causing the magnetic ring and circular plate to move, which is converted into a pulling force on the support plate, enhancing the clamping force and ensuring accurate dynamic balance test data.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a testing device for a steam turbine structural component, comprising a dynamic balancing testing machine, wherein a testing shaft is rotatably mounted on one side of the dynamic balancing testing machine, a nut is threaded onto the surface of the testing shaft, and a limit ring is welded to the outer wall of the testing shaft;

[0008] A cylinder is installed inside the test shaft, and an air storage cylinder is installed inside the test shaft on one side of the cylinder. The piston rod of the cylinder passes through the interior of the air storage cylinder. A sleeve communicating with the air storage cylinder is installed in the vertical axis direction inside the test shaft. A push rod slides inside the sleeve, and a top block is installed at the top of the push rod.

[0009] The surface of the test shaft is provided with a strip groove, a support plate slides inside the strip groove, a clamping plate slides inside the support plate, and the air storage cylinder is connected to the support plate;

[0010] The dynamic balancing testing machine has a protective cover installed on its side wall. A magnet is installed inside the protective cover. An inclined plate is welded to the inner wall of the protective cover. A flow divider is installed on one side of the protective cover. A nozzle A is connected to one side of the flow divider. A nozzle B is connected to the side of the flow divider above nozzle A. A guide vane is installed inside nozzle B.

[0011] Preferably, the test shaft is connected to the rotating shaft of the motor built into the dynamic balancing test machine, and the top block is made of rubber material.

[0012] Preferably, the inside of the strip groove is equipped with two sets of symmetrically arranged sliding rods, and the support plate slides on the outer wall of the sliding rods.

[0013] Preferably, the gas storage cylinder and the sleeve are connected by a connecting pipe A, and the gas storage cylinder and the support plate are connected by a connecting pipe B.

[0014] Preferably, the sleeve has a spring A inside, and the spring A is sleeved on the outer wall of the push rod.

[0015] Preferably, the protective cover has a retractable structure, and a handle is welded to the outer wall of the protective cover.

[0016] Preferably, a high-pressure air pump is provided below the protective cover, and an air supply pipe is connected between the distribution plate and the high-pressure air pump.

[0017] Preferably, the protective cover has a sliding baffle inside, the test shaft has a sliding circular plate inside, the test shaft has a sliding magnetic ring on its outer wall, a connecting rod is provided between the baffle and the magnetic ring, a pull rod is provided between the support plate and the circular plate, a collection box is connected to one side of the baffle, and a collection pipe is connected to one end of the collection box.

[0018] Preferably, the side wall of the dynamic balancing test machine is equipped with two sets of symmetrically arranged limiting rods, and the outer wall of the limiting rod is fitted with a spring B. One end of the spring B is fixedly connected to the side wall of the dynamic balancing test machine, and the other end of the spring B is fixedly connected to the side wall of the baffle.

[0019] Preferably, the clamping plate has an anti-slip rubber pad on the side closest to the component being tested, and the surface of the anti-slip rubber pad has several evenly distributed protrusions.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This invention involves mounting an impeller on the outer wall of a test shaft and initially positioning it with a nut. This causes the piston end of the cylinder to compress the gas inside the gas storage cylinder. Subsequently, a portion of the gas enters the sleeve through connecting pipe A, increasing the gas pressure inside the sleeve. This increased pressure pushes a sliding rod to move away from the sleeve, thereby using the top block at the top of the sliding rod to simultaneously fix the impeller and the nut. Simultaneously, another portion of the gas enters the support plate through connecting pipe B, causing the gas to push the clamping plate out and clamp the side of the nut, further stabilizing the nut and impeller radially. This prevents radial displacement during the rotation of the test shaft, effectively preventing the nut from loosening due to vibration during impeller rotation testing. This avoids test data deviation or test interruption caused by loose components, ensuring the stability and continuity of the testing process and improving the accuracy and reliability of the test results.

[0022] 2. This invention utilizes a high-pressure air pump. The high-pressure air pump generates airflow, which is then fed into a distribution plate via an air delivery pipe. A portion of the airflow in the distribution plate is then fed into nozzle A via a connecting pipe. Nozzle A sprays airflow into the protective cover, forming a continuous protective air film inside the cover. This film directly intercepts and blows away smaller metal impurities ejected during impeller rotation. When larger metal impurities pass through the protective air film, the buffering effect of the film weakens their speed and impact. Simultaneously, the magnets on the inner wall of the protective cover use magnetic force to attract ferromagnetic impurities, causing them to adhere to the magnet surface and preventing them from directly impacting the protective cover or splashing to the outside. Furthermore, the airflow blows the metal impurities directly towards the baffle, which then flows through the airflow channel into the collection pipe and finally into the collection box for storage. This effectively prevents impurities splashed during impeller rotation from injuring workers and significantly reduces safety hazards.

[0023] 3. In this invention, a portion of the airflow input by a high-pressure air pump is ejected through nozzle B. Since a guide vane is installed inside nozzle B, the ejected airflow forms a spiral airflow. The spiral airflow can generate centrifugal force and shear force. For metal impurities adhering to the surface of the magnet, the vortex effect of the rotating airflow can destroy the adsorption force between the impurities and the magnet, making it easier for them to detach from the surface and be carried by the airflow into the collection box. Thus, the vortex cleaning function of the spiral airflow is used to automatically remove impurities from the surface of the magnet, avoiding frequent manual wiping and reducing maintenance workload.

[0024] 4. In this invention, when the airflow generated by the high-pressure air pump carries metal impurities and blows them toward the baffle inside the protective cover, the impact force of the airflow acts on the baffle, causing the baffle to move away from the impeller. Subsequently, as the baffle moves, it drives the magnetic ring to move synchronously through the connecting rod. The displacement of the magnetic ring drives the circular plate to move synchronously within the test shaft through the magnetic field force, thereby converting the axial displacement of the circular plate into a pulling force on the support plate, which further tightens the clamping plate, enhances the clamping force on the nut and impeller, and effectively prevents the nut from loosening or the component from shifting, reduces test errors caused by component loosening or vibration, and ensures the accuracy of dynamic balance test data. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the protective cover of the present invention;

[0027] Figure 3 This is a schematic cross-sectional view of the test shaft structure of the present invention;

[0028] Figure 4 For the present invention Figure 3 Enlarged structural diagram of section A;

[0029] Figure 5 This is a schematic cross-sectional view of the protective cover portion of the present invention;

[0030] Figure 6 For the present invention Figure 5 Enlarged structural diagram of section B;

[0031] Figure 7 This is a schematic cross-sectional view of the protective cover of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of nozzle A and nozzle B of the present invention.

[0033] Legend:

[0034] 1. Dynamic balancing testing machine; 2. Test shaft; 3. Nut; 4. Limiting ring; 5. Cylinder; 6. Air storage tank; 7. Sleeve; 8. Push rod; 9. Top block; 10. Connecting pipe A; 11. Strip groove; 12. Slide rod; 13. Support plate; 14. Clamping plate; 15. Connecting pipe B; 16. Spring A; 17. Protective cover; 18. Magnet; 19. Inclined plate; 20. Diverter plate; 21. High-pressure air pump; 22. Air supply pipe; 23. Nozzle A; 24. Nozzle B; 25. Guide vane; 26. Baffle; 27. Circular plate; 28. Magnetic ring; 29. ​​Connecting rod; 30. Pull rod; 31. Collection box; 32. Collection pipe; 33. Limiting rod; 34. Spring B. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] See Figures 1 to 8 As shown, the present invention provides a testing device for a steam turbine structural component, including a dynamic balancing testing machine 1, a testing shaft 2 rotating on one side of the dynamic balancing testing machine 1, a nut 3 threadedly connected to the surface of the testing shaft 2, and a limit ring 4 welded to the outer wall of the testing shaft 2;

[0037] A cylinder 5 is installed inside the test shaft 2. An air storage cylinder 6 is installed inside the test shaft 2 on one side of the cylinder 5. The piston rod of the cylinder 5 passes through the air storage cylinder 6. A sleeve 7 connected to the air storage cylinder 6 is installed in the vertical axis direction inside the test shaft 2. A push rod 8 slides inside the sleeve 7. A top block 9 is installed at the top of the push rod 8.

[0038] The surface of the test shaft 2 is provided with a strip groove 11, a support plate 13 slides inside the strip groove 11, a clamping plate 14 slides inside the support plate 13, and the air storage cylinder 6 is connected to the support plate 13.

[0039] It should be noted that when testing the turbine blades, the operator first places the impeller on the outer wall of the test shaft 2 and initially positions it using the nut 3. After fixing, the cylinder 5 is activated, causing the piston end of the cylinder 5 to compress the gas inside the gas storage cylinder 6. Subsequently, a portion of the gas flows through the connecting pipe A10 into the sleeve 7, increasing the gas pressure inside the sleeve 7. This increased gas pressure pushes the sliding rod 12 away from the sleeve 7, thereby using the top block 9 at the top of the sliding rod 12 to simultaneously fix the impeller and the nut 3. At the same time, another portion of the gas... The gas enters the support plate 13 through the connecting pipe B15, causing the gas to push the clamping plate 14 out from the inside of the support plate 13. After the clamping plate 14 extends, it clamps and fixes the side of the nut 3, further stabilizing the nut 3 and the impeller in the radial direction, preventing radial displacement during the rotation of the test shaft 2. This effectively prevents the nut 3 from loosening due to vibration during the rotation test, avoiding test data deviation or test interruption caused by component loosening, ensuring the stability and continuity of the test process, and improving the accuracy and reliability of the test results.

[0040] A protective cover 17 is installed on the side wall of the dynamic balancing test machine 1. A magnet 18 is installed inside the protective cover 17. An inclined plate 19 is welded to the inner wall of the protective cover 17. A flow divider 20 is installed on one side of the protective cover 17. A nozzle A23 is connected to one side of the flow divider 20. A nozzle B24 is connected to the side of the flow divider 20 above the nozzle A23. A guide vane 25 is installed inside the nozzle B24.

[0041] It should be noted that, during the impeller rotation test, residual metal impurities on the impeller surface can easily be flung out, potentially causing injury to personnel. Therefore, during the test, the high-pressure air pump 21 is activated. The high-pressure air pump 21 generates airflow, which is then input into the distribution plate 20 through the air supply pipe 22. A portion of the airflow in the distribution plate 20 is then input into the nozzle A23 through the connecting pipe. This causes the nozzle A23 to spray airflow into the protective cover 17, forming a continuous protective air film inside the protective cover 17. This air film acts as a dynamic barrier, covering the impeller rotation area and directly intercepting and blowing away impurities. Smaller metal impurities ejected during impeller rotation are mitigated by the buffering effect of the protective air film, which reduces their speed and impact force when larger metal impurities pass through it. Meanwhile, the magnets 18 on the inner wall of the protective cover 17 use magnetic force to attract ferromagnetic impurities, causing them to adhere to the surface of the magnets 18. This prevents impurities from directly impacting the protective cover 17 or splashing to the outside. Furthermore, the airflow blows the metal impurities directly towards the baffle 26, through the airflow channel into the collection pipe 32, and finally into the collection box 31 for storage. This effectively prevents impurities splashed during impeller rotation from causing injury to workers and significantly reduces safety hazards.

[0042] Meanwhile, another part of the airflow is ejected through nozzle B24. Since the nozzle B24 is equipped with a guide vane 25, the ejected airflow forms a spiral airflow. The spiral airflow can generate centrifugal force and shear force. For metal impurities adhering to the surface of magnet 18, the vortex effect of the rotating airflow can destroy the adsorption force between the impurities and magnet 18, making it easier for them to detach from the surface and be carried by the airflow into the collection box 31. Thus, the vortex cleaning function of the spiral airflow is used to automatically remove impurities from the surface of magnet 18, avoiding frequent manual wiping and reducing maintenance workload.

[0043] A baffle 26 slides inside the protective cover 17, a circular plate 27 slides inside the test shaft 2, a magnetic ring 28 slides on the outer wall of the test shaft 2, a connecting rod 29 is provided between the baffle 26 and the magnetic ring 28, and a pull rod 30 is provided between the support plate 13 and the circular plate 27.

[0044] It should be noted that when the airflow generated by the high-pressure air pump 21 carries metallic impurities and blows towards the baffle 26 inside the protective cover 17, the impact force of the airflow acts on the baffle 26, causing the baffle 26 to move away from the impeller. Subsequently, as the baffle 26 moves, it drives the magnetic ring 28 to move synchronously through the connecting rod 29. Since the magnetic ring 28 is magnetically connected to the circular plate 27 inside the test shaft 2, the displacement of the magnetic ring 28 drives the circular plate 27 to move synchronously within the test shaft 2 through the magnetic field force. This converts the axial displacement of the circular plate 27 into a pulling force on the support plate 13, which further tightens the clamping plate 14, enhances the clamping force on the nut 3 and the impeller, and effectively prevents the nut 3 from loosening or the components from shifting, reduces test errors caused by component loosening or vibration, and ensures the accuracy of dynamic balance test data.

[0045] The impeller is fitted onto the outer wall of the test shaft 2 and initially positioned using the nut 3. The cylinder 5 is then activated, its piston end compressing the gas in the gas storage cylinder 6. The gas enters the sleeve 7 via the connecting pipe A10, pushing the slide rod 12 to move the top block 9 to fix the impeller and nut 3. The airflow enters the support plate 13 via the connecting pipe B15, pushing the clamping plate 14 to extend from the side of the clamping nut 3, preventing radial displacement of the nut 3 and impeller. The high-pressure air pump 21 is then activated, and the airflow reaches the nozzle A23 via the connecting pipe, forming a protective air film inside the protective cover 17 to intercept and buffer metal. Impurities are removed by the inner wall magnet 18, which attracts ferromagnetic impurities. The airflow blows the impurities toward the baffle 26 and collects them. The airflow is also ejected through the nozzle B24. Due to the flow guide plate 25, a spiral airflow is formed, which uses the eddy current effect to remove impurities from the surface of the magnet 18. At the same time, the airflow impacts the baffle 26 and moves it. This movement is caused by the connecting rod 29, which drives the magnetic ring 28. The magnetic ring 28 drives the circular plate 27 inside the test shaft 2 through the magnetic field force. The axial displacement of the circular plate 27 is converted into a pulling force on the support plate 13, which further tightens the clamping plate 14 and ensures the accuracy of the test data.

[0046] See Figures 2 to 3 As shown, the test shaft 2 is connected to the rotating shaft of the motor built into the dynamic balancing test machine 1. The top block 9 is made of rubber material. The elastic modulus of rubber material is low. When the top block 9 presses against the impeller and nut 3, it can effectively buffer the impact force at the moment of contact, avoid rigid contact causing indentations, scratches and other damage to the surface of the component, and protect the integrity of the tested component.

[0047] See Figure 4 As shown, two sets of symmetrically arranged slide rods 12 are installed inside the strip groove 11. The support plate 13 slides on the outer wall of the slide rod 12. The slide rod 12 can ensure that the support plate 13 can only slide smoothly in the radial direction of the test axis 2, so as to avoid the support plate 13 from shifting or shaking during the movement.

[0048] See Figure 4 As shown, the gas storage cylinder 6 is connected to the sleeve 7 via a connecting pipe A10, and the gas storage cylinder 6 is connected to the support plate 13 via a connecting pipe B15.

[0049] See Figure 4 As shown, the sleeve 7 is equipped with a spring A16 inside. The spring A16 is sleeved on the outer wall of the push rod 8. After the test, the air pressure in the air storage cylinder 6 drops, and the push rod 8, which loses the push of air pressure, can automatically reset under the elastic restoring force of the spring A16.

[0050] See Figure 1 and Figure 5 As shown, the protective cover 17 adopts a telescopic structure. A handle is welded to the outer wall of the protective cover 17. By holding the handle on the outer wall of the protective cover 17, the telescopic protective cover 17 is retracted to its minimum size, making enough space to unscrew the nut 3 and remove the impeller from the test shaft 2.

[0051] See Figure 5 As shown, a high-pressure air pump 21 is provided below the protective cover 17, and an air supply pipe 22 is connected between the distribution plate 20 and the high-pressure air pump 21.

[0052] See Figure 5 and Figure 7 As shown, a collection box 31 is connected to one side of the baffle 26, and a collection pipe 32 is connected to one end of the collection box 31. Impurities can be collected in a concentrated manner through the collection box 31 for unified processing.

[0053] See Figure 7 As shown, two sets of symmetrically arranged limiting rods 33 are installed on the side wall of the dynamic balancing test machine 1. A spring B34 is sleeved on the outer wall of the limiting rod 33. One end of the spring B34 is fixedly connected to the side wall of the dynamic balancing test machine 1, and the other end of the spring B34 is fixedly connected to the side wall of the baffle 26.

[0054] See Figure 4 As shown, the clamping plate 14 is provided with an anti-slip rubber pad on the side closest to the component being tested, and the surface of the anti-slip rubber pad is provided with several evenly distributed protrusions. The rubber pad can convert concentrated stress into distributed load, and avoid the component surface from being indented, scratched or plastically deformed due to excessive local pressure.

[0055] Working principle: When it is necessary to test the turbine blades, the operator first puts the impeller on the outer wall of the test shaft 2 and uses the nut 3 for initial positioning. After fixing, the cylinder 5 is started, which compresses the gas inside the gas storage cylinder 6 at the piston end of the cylinder 5. Then, part of the gas enters the sleeve 7 through the connecting pipe A10, which increases the gas pressure inside the sleeve 7. At the same time, the increased gas pressure pushes the slide rod 12 to move away from the sleeve 7, thereby using the top block 9 at the top of the slide rod 12 to fix the impeller and the nut 3 at the same time. Meanwhile, another part of the gas enters the support plate 13 through the connecting pipe B15, which pushes the clamping plate 14 to extend out from the inside of the support plate 13. After the clamping plate 14 extends out, it clamps and fixes the side of the nut 3, further stabilizing the nut 3 and the impeller in the radial direction and preventing radial displacement during the rotation of the test shaft 2.

[0056] By activating the high-pressure air pump 21, the generated airflow is input into the distribution plate 20 through the air supply pipe 22. A portion of the airflow in the distribution plate 20 is then input into the nozzle A23 through the connecting pipe, causing the nozzle A23 to spray airflow into the protective cover 17. This forms a continuous protective air film inside the protective cover 17, which can directly intercept and blow away smaller metal impurities thrown out when the impeller rotates. When larger metal impurities pass through the protective air film, the buffering effect of the air film weakens their flight speed and impact force. At the same time, the magnet 18 on the inner wall of the protective cover 17 uses magnetic force to attract ferromagnetic impurities, causing them to adhere to the surface of the magnet 18, preventing impurities from directly impacting the protective cover 17 or splashing to the outside. The airflow blows the metal impurities directly towards the baffle 26, which then flows into the collection pipe 32 through the airflow channel, and finally into the collection box 31 for storage.

[0057] Meanwhile, another part of the airflow is ejected through nozzle B24. The nozzle B24 is equipped with a guide vane 25, which makes the ejected airflow form a spiral airflow. The vortex effect of the rotating airflow can destroy the adsorption force between the impurities and the magnet 18, making it easier for them to detach from the surface and be carried by the airflow into the collection box 31. Thus, the vortex cleaning function of the spiral airflow is used to automatically remove impurities from the surface of the magnet 18.

[0058] In addition, when the airflow generated by the high-pressure air pump 21 carries metal impurities and blows them toward the baffle 26 inside the protective cover 17, the impact force of the airflow acts on the baffle 26, causing the baffle 26 to move away from the impeller. Subsequently, as the baffle 26 moves, it drives the magnetic ring 28 to move synchronously through the connecting rod 29, thereby converting the axial displacement of the circular plate 27 into a pulling force on the support plate 13, which further tightens the clamping plate 14.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A testing device for a steam turbine structural component, comprising a dynamic balancing testing machine (1), characterized in that: The dynamic balancing test machine (1) has a test shaft (2) rotating on one side, and a nut (3) is threaded onto the surface of the test shaft (2). A limit ring (4) is welded to the outer wall of the test shaft (2). A cylinder (5) is installed inside the test shaft (2). An air storage cylinder (6) is installed inside the test shaft (2) on one side of the cylinder (5). The piston rod of the cylinder (5) passes through the air storage cylinder (6). A sleeve (7) communicating with the air storage cylinder (6) is installed in the vertical axis direction inside the test shaft (2). A push rod (8) slides inside the sleeve (7). A top block (9) is installed at the top of the push rod (8). The surface of the test shaft (2) is provided with a strip groove (11), a support plate (13) slides inside the strip groove (11), a clamping plate (14) slides inside the support plate (13), and the air storage cylinder (6) is connected to the support plate (13). The side wall of the dynamic balancing test machine (1) is equipped with a protective cover (17), a magnet (18) is installed inside the protective cover (17), an inclined plate (19) is welded to the inner wall of the protective cover (17), a flow divider (20) is installed on one side of the protective cover (17), a nozzle A (23) is connected to one side of the flow divider (20), a nozzle B (24) is connected to the side of the flow divider (20) above the nozzle A (23), and a guide vane (25) is installed inside the nozzle B (24).

2. The testing device for a steam turbine structural component according to claim 1, characterized in that: The test shaft (2) is connected to the rotating shaft of the motor built into the dynamic balancing test machine (1), and the top block (9) is made of rubber material.

3. The testing device for a steam turbine structural component according to claim 1, characterized in that: The inside of the strip groove (11) is equipped with two sets of symmetrically arranged slide rods (12), and the support plate (13) slides on the outer wall of the slide rods (12).

4. The testing device for a steam turbine structural component according to claim 1, characterized in that: The gas storage cylinder (6) is connected to the sleeve (7) through a connecting pipe A (10), and the gas storage cylinder (6) is connected to the support plate (13) through a connecting pipe B (15).

5. The testing device for a steam turbine structural component according to claim 1, characterized in that: The sleeve (7) is provided with a spring A (16) inside, and the spring A (16) is sleeved on the outer wall of the push rod (8).

6. The testing device for a steam turbine structural component according to claim 1, characterized in that: The protective cover (17) is designed with a retractable structure, and a handle is welded to the outer wall of the protective cover (17).

7. The testing device for a steam turbine structural component according to claim 1, characterized in that: A high-pressure air pump (21) is provided below the protective cover (17), and an air supply pipe (22) is connected between the distribution plate (20) and the high-pressure air pump (21).

8. The testing device for a steam turbine structural component according to claim 1, characterized in that: A baffle (26) slides inside the protective cover (17), a circular plate (27) slides inside the test shaft (2), a magnetic ring (28) slides on the outer wall of the test shaft (2), a connecting rod (29) is provided between the baffle (26) and the magnetic ring (28), a pull rod (30) is provided between the support plate (13) and the circular plate (27), a collection box (31) is connected to one side of the baffle (26), and a collection pipe (32) is connected to one end of the collection box (31).

9. A testing device for a steam turbine structural component according to claim 8, characterized in that: The side wall of the dynamic balancing test machine (1) is equipped with two sets of symmetrically arranged limiting rods (33). The outer wall of the limiting rod (33) is fitted with a spring B (34). One end of the spring B (34) is fixedly connected to the side wall of the dynamic balancing test machine (1), and the other end of the spring B (34) is fixedly connected to the side wall of the baffle (26).

10. A testing device for a steam turbine structural component according to claim 1, characterized in that: The clamp (14) has an anti-slip rubber pad on the side near the part being tested, and the surface of the anti-slip rubber pad has several evenly distributed protrusions.

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