Strain measuring point testing device suitable for water turbine top cover

Abstract

The utility model relates to the technical field of water turbines, in particular to a strain measuring point testing device suitable for a top cover of a water turbine, which comprises a mounting substrate, a top cover tool, a load loading mechanism, a pressing plate mechanism and a strain monitoring device, a plurality of vertical rib plates are arranged in the top cover tool at intervals, and a boundary flange is arranged on the edge of the bottom of the outer side of the top cover tool. The load loading mechanism comprises a plurality of groups of telescopic rods, the telescopic rods are arranged on the mounting base plate, and the telescopic ends of the telescopic rods abut against the bottom of the top cover tool; the pressing plate mechanism comprises a pressing plate and a pressing plate bolt, the pressing plate is in bolted connection with the mounting base plate through the pressing plate bolt, and one end of the pressing plate presses and fixes the boundary flange between the pressing plate and the mounting base plate; the strain monitoring device comprises strain sensors, a strain demodulator and a display terminal which are electrically connected in sequence, and the plurality of strain sensors are arranged on the rib plate. The top cover tool has the advantages that the top cover tool is fixed on the mounting base plate through the pressing plate mechanism, threaded holes are prevented from being formed, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbines, in particular to a strain measuring point test device suitable for a water turbine top cover. Background Art

[0002] When constructing a digital twin model that is highly mapped to the physical entity, obtaining the actual load of product operation based on load identification technology is of great significance to improving the reliability of digital twin virtual-real mapping. The accuracy level of load inversion can be improved based on an effective strain measurement point arrangement method.

[0003] Due to the huge structure of the turbine top cover and the complex working conditions, it requires huge use costs to directly perform strain testing in actual projects. However, there are many inconveniences in the process of strain testing verification through traditional similar models:

[0004] 1. The existing turbine top cover test model needs to process threads in the flange area to achieve boundary fixation, and the test bench threaded holes are required to correspond to it, which limits the adaptability of the tooling to the test site. The existing top cover simulation test tooling is mostly used to verify the fatigue characteristics of the connecting bolts, so the bolt connection at the boundary flange of the top cover cannot be ignored. However, for the purpose of feasibility verification of bottom load identification by installing strain sensors at the top cover rib plate position, it is only necessary to ensure that the boundary is completely fixed. In this case, the cost of using threaded connection is relatively high.

[0005] 2. Difficulty in simulating load gradients. Under working conditions, different areas of the top and bottom of the turbine will be subjected to different pressures. It is difficult to simulate such complex load distribution in traditional water pressure tests, and the test conditions may not accurately reproduce the actual working conditions. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology. To this end, the utility model provides a strain measurement point test device suitable for a turbine top cover.

[0007] The purpose of the utility model is achieved through the following technical solutions: a strain measuring point test device suitable for a turbine top cover, comprising a mounting base, a top cover tooling, a load loading structure, a pressure plate mechanism and a strain monitoring device; a plurality of vertical ribs are arranged at intervals in the top cover tooling, and a boundary flange is arranged on the outer bottom edge of the top cover tooling; the load loading mechanism comprises a plurality of groups of telescopic rods, the telescopic rods are all arranged on the mounting base plate, and the telescopic ends of the telescopic rods are all against the bottom of the top cover tooling; the pressure plate mechanism comprises a pressure plate and a pressure plate bolt, the pressure plate is bolted to the mounting base plate through the pressure plate bolt, and one end of the pressure plate presses and fixes the boundary flange between the pressure plate and the mounting base plate; the strain monitoring device comprises a strain sensor, a strain demodulator and a display terminal electrically connected in sequence, and a plurality of the strain sensors are arranged on the rib plate. The utility model fixes the top cover tooling on the mounting base plate by using the pressure plate mechanism, and there is no need to open a hole position on the boundary flange of the top cover tooling, and there is no need to open a threaded hole corresponding to the boundary flange hole position on the mounting base plate, thereby reducing the cost and improving the adaptability of the device.

[0008] In some embodiments, the top cover tooling includes a top cover top plate and a top cover bottom plate, a plurality of ribs are arranged between the top cover top plate and the top cover bottom plate, the outer side of the top cover bottom plate is connected to the boundary flange, and the telescopic end of the telescopic rod abuts against the top cover bottom plate. The top cover is divided into a top cover top plate and a top cover bottom plate, and a rib is arranged between the top cover bottom plate and the top cover top plate, so as to more realistically simulate the stress condition of the top cover.

[0009] In some embodiments, the projection of the top cover tooling on the horizontal plane is in the shape of a third of a ring, and the boundary flange is arranged at the bottom edge of the outer arc side of the top cover tooling. The top cover tooling is arranged in the shape of a third of a ring, which can simulate the stress condition of the top cover to measure the strain and reduce the manufacturing cost of the top cover tooling.

[0010] In some embodiments, the load loading mechanism includes at least three groups of telescopic rods, and the at least three groups of telescopic rods are arranged in sequence on the mounting base plate along the radial direction of one-third of the annular projection of the top cover tooling on the horizontal plane. The load loading mechanism is provided with three groups of telescopic rods, and the three groups of telescopic rods respectively apply different loads to the top cover tooling to achieve gradient loading of the load.

[0011] In some embodiments, each group of telescopic rods includes at least three telescopic rods, and the telescopic rods in the same group are evenly arranged on the mounting base plate along the circumferential direction of one-third of the annular projection of the top cover tooling on the horizontal plane. The telescopic rods in the same group are arranged along the circumferential direction of the top cover tooling, so that the positions of the same radius at the bottom of the top cover tooling are evenly stressed, simulating the actual stress condition of the top cover.

[0012] In some embodiments, each group of telescopic rods is provided with a corresponding manual pump, and the telescopic rods in the same group are connected to the same manual pump, so that the telescopic rods in the same group exert the same force on the top cover tooling, so as to better simulate the actual force condition of the top cover.

[0013] In some embodiments, the telescopic rod includes an oil cylinder, which is convenient for applying a large load to the top cover tooling.

[0014] In some embodiments, the pressure plate is U-shaped, the pressure plate bolts penetrate the pressure plate and connect the pressure plate to the mounting substrate; the pressure plate mechanism further comprises a first pad and a second pad, both of which are placed on the mounting substrate, the first pad is padded at the bottom of the boundary flange, and the second pad is padded at one end of the pressure plate away from the boundary flange. The pressure plate is U-shaped so that the pressure plate bolts can penetrate from the center of the pressure plate, avoiding opening holes in the pressure plate, and fixing the pressure plate on the mounting substrate.

[0015] In some embodiments, the mounting base plate includes a plurality of mounting strips arranged in parallel and spaced apart, with gaps between the mounting strips, the bolt heads of the clamping plate bolts are clamped at the bottom of the gaps between the mounting strips, and the tops of the clamping plate bolts are clamped to the clamping plate via nuts. The mounting strips facilitate the connection of the clamping plate mechanism and the position of the clamping plate mechanism can be quickly changed, so that multiple clamping plate mechanisms can match top cover tooling of different sizes, thereby improving the adaptability of the device.

[0016] The utility model has the following advantages:

[0017] 1. By setting up several pressing plate mechanisms, the top cover tooling is not directly connected to the mounting base plate, but is connected to the mounting base plate by bolts, so that the pressing plate presses the boundary flange of the top cover tooling onto the mounting base plate, avoiding the need to open holes on the boundary flange of the top cover tooling, and further avoiding the need to open threaded holes on the mounting base plate corresponding to the hole positions of the boundary flange, thereby reducing manufacturing costs and improving the adaptability of the device.

[0018] 2. By setting multiple groups of telescopic rods at different positions at the bottom of the top cover tooling, gradient loading of the top cover tooling load can be achieved, and the simulation of the force on the top cover tooling is more realistic. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of a test device for optimizing arrangement of strain measurement points for a turbine top cover according to the utility model;

[0020] Figure 2 It is a top view of the strain measurement point optimization arrangement test device applicable to the turbine top cover of the utility model;

[0021] Figure 3A schematic diagram of the arrangement of telescopic rods of the utility model;

[0022] In the figure: 1. Installation strip; 21. Top cover bottom plate; 22. Top cover top plate; 23. Rib plate; 24. Boundary flange; 31. Telescopic rod; 32. Manual pump; 34. One-to-three distributor; 33. Pressure gauge; 41. Pressure plate; 42. Pressure plate bolt; 51. Strain sensor; 52. Strain demodulator; 53. Display terminal; 61. First cushion block; 62. Second cushion block; 7. Pad. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0024] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0025] like Figure 1-Figure 3 As shown, a strain measuring point test device suitable for a turbine top cover comprises: a mounting base plate, a top cover tooling, a load loading mechanism, a pressing plate mechanism and a strain monitoring device;

[0026] A plurality of vertical ribs 23 are arranged at intervals inside the top cover fixture, and a boundary flange 24 is arranged at the outer bottom edge of the top cover fixture;

[0027] The load loading mechanism includes a plurality of telescopic rods 31, and the telescopic rods 31 are all arranged on the mounting base plate, and the telescopic ends of the telescopic rods 31 abut against the bottom of the top cover tooling;

[0028] The pressing plate mechanism includes a pressing plate 41 and a pressing plate bolt 42, wherein the pressing plate 41 is bolted to the mounting base plate through the pressing plate bolt 42, and one end of the pressing plate 41 presses and fixes the boundary flange 24 between the pressing plate 41 and the mounting base plate;

[0029] The strain monitoring device includes a strain sensor 51 , a strain demodulator 52 and a display terminal 53 which are electrically connected in sequence. A plurality of the strain sensors 51 are arranged on the rib plate 23 .

[0030] Specifically, in this embodiment, the top cover tooling is a turbine top cover model that is smaller than the previous model and retains one-third of the circumferential structure, which can simulate the stress on the top cover while reducing the manufacturing cost. In this embodiment, a pad 7 is provided at one end of the telescopic rod 31 that abuts against the bottom of the top cover tooling. The pad 7 increases the stress area between the telescopic rod 31 and the top cover tooling, making the load loading more uniform. In this embodiment, the pressure plate 41 is connected to the mounting base plate through the pressure plate bolt 42, and one end of the pressure plate 41 is crimped on the boundary flange 24 of the top cover tooling, so that the top cover tooling does not move when the load applied by the telescopic rod 31. In the application process of this embodiment, the load is applied to the bottom of the top cover tooling through the telescopic rod 31, and the pressure plate mechanism is crimped to fix the boundary flange 24. The several strain sensors 51 arranged on the rib plate 23 can monitor the strain of the rib plate 23, and the load inversion of the top cover can be effectively performed. The strain sensor in this embodiment is an optical fiber strain sensor. By using a pressure plate mechanism, there is no need to open holes for bolt connection on the boundary flange 24, and further, there is no need to open threaded holes corresponding to the holes of the boundary flange 24 on the mounting base plate, thereby reducing the manufacturing cost of the device. In addition, by using several pressure plate mechanisms, the device can be crimped with top cover tooling of different sizes, thereby improving the adaptability of the device.

[0031] Preferably, the top cover tooling comprises a top cover top plate 22 and a top cover bottom plate 21, a plurality of ribs 23 are arranged between the top cover top plate 22 and the top cover bottom plate 21, the outer side of the top cover bottom plate 21 is connected to the boundary flange 24, and the telescopic end of the telescopic rod 31 abuts against the top cover bottom plate 21. Specifically, in this embodiment, Figure 1 As shown, the top cover bottom plate 21 is a flat plate structure, and the top cover top plate 22 is a special-shaped plate structure with a slope. By setting the top cover bottom plate 21 and the top cover top plate 22, the top cover tooling structure is consistent with the internal structure of the turbine top cover, so that the accuracy of monitoring the strain of the top cover tooling is higher.

[0032] Preferably, the projection of the top cover tooling on the horizontal plane is in the shape of one-third of a ring, and the boundary flange 24 is arranged at the bottom edge of the outer arc side of the top cover tooling. Specifically, in the present embodiment, the top cover tooling as a whole is a one-third circular ring structure, which can not only simulate the stress condition of the turbine top cover, but also reduce the manufacturing cost. In the present embodiment, a total of four vertical ribs 23 are arranged between the top cover bottom plate 21 and the top cover top plate 22, wherein a number of strain sensors 51 are respectively arranged on one side of the two middle ribs 23. The strains of the two middle ribs 23 are compared with the strains of the two outer ribs 23 to better represent the strains of the real turbine top cover ribs 23 when they are stressed, so the strain sensors 51 are arranged on the two middle ribs 23 of the top cover tooling.

[0033] Preferably, the load loading mechanism includes at least three groups of telescopic rods 31, and the at least three groups of telescopic rods 31 are arranged in sequence on the mounting base plate along the radial direction of one-third of the annular projection of the top cover tooling on the horizontal plane. In this embodiment, the three groups of telescopic rods 31 are respectively distributed along the radial direction of the top cover tooling, and the three groups of telescopic rods 31 respectively apply loads of different sizes to achieve the purpose of load gradient loading.

[0034] Preferably, each group of telescopic rods 31 includes at least three telescopic rods 31, and the telescopic rods 31 in the same group are evenly arranged on the mounting base plate along the circumferential direction of one-third of the annular projection of the top cover tooling on the horizontal plane. Each group of telescopic rods 31 includes three telescopic rods 31, and the three telescopic rods 31 in the same group are evenly arranged at the bottom of the top cover tooling along the circumferential direction of the top cover tooling, so that the loads at the same radial position of the bottom of the top cover tooling are equal, simulating the stress condition of the real turbine top cover.

[0035] Preferably, each group of telescopic rods 31 is correspondingly provided with a manual pump 32, and the telescopic rods 31 in the same group are all connected to the same manual pump 32. In this embodiment, the three telescopic rods 31 in the same group are connected to the same manual pump 32 through a one-to-three distributor 34, and a pressure gauge 33 is also provided on the pipeline connecting the manual pump 32 and the telescopic rods 31. By connecting the telescopic rods 31 in the same group to the same manual pump 32, it is ensured that the loads applied by the telescopic rods 31 in the same group to the top cover tooling are equal.

[0036] Preferably, the telescopic rod 31 comprises an oil cylinder. The load on the turbine top cover is relatively large, and the oil cylinder can apply a relatively large load to the top cover tooling, making the simulated stress condition more realistic.

[0037] Preferably, the pressing plate 41 is U-shaped, and the pressing plate bolt 42 passes through the pressing plate 41 and connects the pressing plate 41 to the mounting substrate; the pressing plate mechanism also includes a first pad 61 and a second pad 62, both of which are placed on the mounting substrate, the first pad 61 is padded at the bottom of the boundary flange 24, and the second pad 62 is padded at one end of the pressing plate 41 away from the boundary flange 24. In this embodiment, since the top cover tooling is placed on the top of the telescopic rod 31, there is a certain gap between the top cover tooling and the mounting substrate, and the bottom of the boundary flange 24 is supported by the first pad 61, and the pressing plate 41 is padded to maintain the level by the second pad 62. The U-shaped pressing plate 41 facilitates the pressing plate bolt 42 to pass through the pressing plate 41 from the middle of the pressing plate 41 and press the pressing plate 41 with a nut. In this embodiment, the pressing plate 41 has an open end that presses the boundary flange 24, and the second pad 62 is padded at the bottom of the other end of the pressing plate 41.

[0038] Preferably, the mounting base plate includes a plurality of mounting strips 1 arranged in parallel and spaced apart, with gaps between the mounting strips 1, the bolt heads of the pressure plate bolts 42 are clamped at the bottom of the gaps between the mounting strips 1, and the tops of the pressure plate bolts 42 are pressed against the pressure plate 41 through nuts. Specifically, in the present embodiment, the mounting base plate includes a plurality of mounting strips 1 arranged in parallel and spaced apart, with gaps between the mounting strips 1, the bolt heads of the pressure plate bolts 42 are located at the bottom of the gaps between the mounting strips 1, and the pressure plate bolts 42 can adjust their positions within the gaps between the mounting strips 1 to set the pressure plate mechanism at different positions. By changing the positions of the pressure plate mechanisms, a plurality of pressure plate mechanisms can fix top cover tooling of different sizes, thereby improving the adaptability of the device.

[0039] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the above-mentioned technical content without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope of the technical solution of the utility model.

Claims

1. A strain measuring point test device suitable for a turbine top cover, characterized in that: include: Install the base plate; A top cover tooling, wherein a plurality of vertical ribs (23) are arranged at intervals inside the top cover tooling, and a boundary flange (24) is arranged at the outer bottom edge of the top cover tooling; A load loading mechanism, the load loading mechanism comprising a plurality of groups of telescopic rods (31), the telescopic rods (31) being arranged on the mounting base plate, and the telescopic ends of the telescopic rods (31) being in contact with the bottom of the top cover tooling; A plurality of pressure plate mechanisms, wherein the pressure plate mechanisms include a pressure plate (41) and a pressure plate bolt (42), wherein the pressure plate (41) is bolt-connected to the mounting base plate via the pressure plate bolt (42), and one end of the pressure plate (41) presses and fixes the boundary flange (24) between the pressure plate (41) and the mounting base plate; A strain monitoring device comprises a strain sensor (51), a strain demodulator (52) and a display terminal (53) which are electrically connected in sequence, wherein a plurality of the strain sensors (51) are arranged on the rib plate (23).

2. A strain measuring point test device suitable for a turbine top cover according to claim 1, characterized in that: The top cover tooling comprises a top cover top plate (22) and a top cover bottom plate (21), a plurality of rib plates (23) are arranged at intervals between the top cover top plate (22) and the top cover bottom plate (21), the outer side of the top cover bottom plate (21) is connected to the boundary flange (24), and the telescopic end of the telescopic rod (31) abuts against the top cover bottom plate (21).

3. The strain measuring point test device for a turbine top cover according to claim 1, characterized in that: The projection of the top cover tooling on the horizontal plane is in the shape of one-third of a ring, and the boundary flange (24) is arranged at the bottom edge of the outer arc side of the top cover tooling.

4. A strain measuring point test device suitable for a turbine top cover according to claim 3, characterized in that: The load loading mechanism comprises at least three groups of telescopic rods (31), and the at least three groups of telescopic rods (31) are arranged in sequence on the mounting base plate along the radial direction of one-third of the annular projection of the top cover tooling on the horizontal plane.

5. A strain measuring point test device suitable for a turbine top cover according to claim 4, characterized in that: Each group of telescopic rods (31) comprises at least three telescopic rods (31), and the telescopic rods (31) in the same group are evenly arranged on the mounting base plate along the circumferential direction of one-third of the annular projection of the top cover tooling on the horizontal plane.

6. The strain measuring point test device for a turbine top cover according to claim 4, characterized in that: Each group of telescopic rods (31) is correspondingly provided with a manual pump (32), and the telescopic rods (31) in the same group are connected to the same manual pump (32).

7. The strain measuring point test device for a turbine top cover according to claim 1, characterized in that: The telescopic rod (31) comprises an oil cylinder.

8. The strain measuring point test device for a turbine top cover according to claim 1, characterized in that: The pressure plate (41) is U-shaped, and the pressure plate bolt (42) passes through the pressure plate (41) and connects the pressure plate (41) to the mounting substrate; the pressure plate mechanism also includes a first pad (61) and a second pad (62), and the first pad (61) and the second pad (62) are both placed on the mounting substrate, the first pad (61) is padded at the bottom of the boundary flange (24), and the second pad (62) is padded at one end of the pressure plate (41) away from the boundary flange (24).

9. A strain measuring point test device suitable for a turbine top cover according to claim 8, characterized in that: The mounting base plate comprises a plurality of mounting strips (1) arranged in parallel and at intervals, wherein there are gaps between the mounting strips (1), the bolt heads of the pressure plate bolts (42) are clamped at the bottom of the gaps between the mounting strips (1), and the tops of the pressure plate bolts (42) are pressed against the pressure plate (41) via nuts.

Images