A steel frame concrete test platform for helicopter hub central piece

Abstract

The application discloses a steel frame concrete test platform for a helicopter hub central part, which comprises a bearing bottom plate, a columnar steel frame structure and a steel frame concrete structure; the columnar steel frame structure comprises screw rod assemblies, an upper support plate and a lower support plate; the upper support plate and the lower support plate are provided with a plurality of groups of bolt holes corresponding in position, and each group of bolt holes is used for fixedly mounting one screw rod assembly, so that the upper support plate and the lower support plate are fixedly mounted at the same axial position of each screw rod assembly; the columnar steel frame structure after installation is placed in a cement foundation pit as a whole; the steel frame concrete structure comprises a plurality of steel bars and concrete for pouring; the plurality of steel bars penetrates the screw rod assemblies of the columnar steel frame structure and reserved steel frames in the cement foundation pit in a circumferential direction of the cement foundation pit, so as to connect the columnar steel frame structure and the cement foundation pit together in the form of a steel bar distribution net; the concrete is injected into the cement foundation pit through drainage holes on the upper support plate and the lower support plate, so that the steel frame concrete test platform and the cement foundation pit are integrated into a structure, and the bearing bottom plate is fixedly mounted on the top end face of the upper support plate. The technical scheme of the application solves the problem that the existing ordinary welded steel frame test platform for a conventional ball flexible hub central part cannot be used to realize fatigue test loading of a hub central part of a heavy helicopter, because the hub central part of the heavy helicopter bears greater load compared with existing models of helicopters.

Description

TECHNICAL FIELD

[0001] The present application relates to, but not limited to, the technical field of heavy load stress test of helicopter hub central part, and particularly relates to a steel frame concrete test platform for helicopter hub central part. BACKGROUND

[0002] The hub central part is one of the core components of the helicopter rotor system, and is a key stress component on the helicopter, which bears the centrifugal force, lift, flapping force, lagging force and damping force transmitted by the blades. The stress condition is very complex. Therefore, the fatigue life of the hub central part directly affects the service life of the entire helicopter, and the performance directly affects the strength and flight safety of the helicopter.

[0003] The heavy helicopter hub has been expanded from the original 5 arms to 7 arms, and the elastic bearing has been changed from the original single ball flexible elastic bearing to a combined elastic bearing. The length of the blade is twice that of the 13-ton blade. Therefore, the hub central part will bear greater load. Therefore, the existing ordinary welded steel frame test platform for conventional ball flexible hub central part cannot meet the loading of the fatigue test of the heavy hub central part of the hundred-ton level. SUMMARY

[0004] The purpose of the present application is to solve the above problems. The present application provides a steel frame concrete test platform for helicopter hub central part, which solves the problem that the existing ordinary welded steel frame test platform for conventional ball flexible hub central part cannot be used to realize the fatigue test loading of the hub central part of the heavy helicopter, which bears greater load than the existing model helicopter.

[0005] The technical solution of the present application is that the present application provides a steel frame concrete test platform for helicopter hub central part, which comprises a load-bearing bottom plate 7, a columnar steel frame structure and a steel frame concrete structure.

[0006] The columnar steel frame structure comprises a screw rod assembly 1, an upper support plate 2 and a lower support plate 3. The upper support plate 2 and the lower support plate 3 are provided with a plurality of groups of bolt holes corresponding in position, for fixing and installing one screw rod assembly 1 through each group of bolt holes, so as to fix and install the upper support plate 2 and the lower support plate 3 at the same axial position of each screw rod assembly 1. The installed columnar steel frame structure is placed in the cement pit 4 as a whole.

[0007] The steel frame concrete structure comprises a plurality of steel bars 5 and concrete 6 for pouring; the plurality of steel bars 5 are arranged along the circumferential direction of the cement foundation pit 4, penetrate the screw rod assembly 1 of the columnar steel frame structure and the reserved steel frame in the cement foundation pit 4, and connect the columnar steel frame structure and the cement foundation pit 4 together in the form of a steel bar mesh; the concrete 6 is injected into the cement foundation pit 4 through the drainage holes on the upper support plate 2 and the lower support plate 3, so that the steel frame concrete test platform is integrated with the cement foundation pit 4 into a structure, and the load-bearing bottom plate 7 is fixedly installed on the top end surface of the upper support plate 2.

[0008] Optionally, in the steel frame concrete test platform for the helicopter hub central part as described above, the columnar steel frame structure comprises a plurality of screw rod assemblies 1 and a plurality of reserved steel frames in the cement foundation pit 4, and the plurality of screw rod assemblies 1 are arranged along the circumferential direction of the cement foundation pit 4.

[0009] The upper support plate 2 is provided with a plurality of upper plate connecting holes 2-1 and upper plate drainage holes 2-2 in the circumferential direction, and the middle part is provided with the upper plate drainage holes 2-2; the lower support plate 3 is provided with a plurality of lower plate connecting holes 3-1 and lower plate drainage holes 3-2 in the circumferential direction, and the middle part is provided with the lower plate drainage holes 3-2; the upper plate connecting holes 2-1 and the lower plate connecting holes 3-1 are arranged one by one and have the same vertical position.

[0010] Optionally, in the steel frame concrete test platform for the helicopter hub central part as described above, the columnar steel frame structure comprises a plurality of screw rod assemblies 1 and a plurality of reserved steel frames in the cement foundation pit 4, and the plurality of screw rod assemblies 1 are arranged along the circumferential direction of the cement foundation pit 4.

[0011] Each screw rod assembly 1 comprises a connecting screw rod 1-1, a first nut 1-2 screwed into the top end of the connecting screw rod 1-1 to a preset depth, and a second nut 1-3 screwed into the top end of each connecting screw rod 1-1 to the top end surface of the upper support plate 2 after the top end of each connecting screw rod 1-1 passes through the upper plate connecting hole 2-1 of the upper support plate 2, so as to fix the upper support plate 2 and each connecting screw rod 1-1, respectively.

[0012] Optionally, in the steel frame concrete test platform for the helicopter hub central part as described above, the columnar steel frame structure comprises a plurality of screw rod assemblies 1 and a plurality of reserved steel frames in the cement foundation pit 4, and the plurality of screw rod assemblies 1 are arranged along the circumferential direction of the cement foundation pit 4.

[0013] A third nut 1-4 is screwed into the bottom end of each connecting screw rod 1-1 to a preset depth, and a fourth nut 1-5 is screwed into the bottom end of each connecting screw rod 1-1 to the bottom end surface of the lower support plate 3 after the bottom end of each connecting screw rod 1-1 passes through the lower plate connecting hole 3-1 of the lower support plate 3, so as to fix the lower support plate 3 and each connecting screw rod 1-1, respectively.

[0014] The bottom end of part of the screw rod assemblies 1 is provided with an adjusting nut 1-6, which is used to adjust the levelness of the columnar steel frame structure after the columnar steel frame structure is placed in the cement foundation pit 4.

[0015] Optionally, in the steel frame concrete test platform for the helicopter hub central part as described above,

[0016] After the plurality of steel bars 5 are passed through the reserved steel frames in the screw assembly 1 of the column steel frame structure and the cement foundation pit 4, each steel bar 5 is fixed with the screw assembly 1 and the reserved steel frame in the cement foundation pit 4 by welding, so that the column steel frame structure, the cement foundation pit 4 and each steel bar 5 form an integral structure.

[0017] Optionally, in the steel-concrete test platform for the helicopter hub central part as described above,

[0018] After the column steel frame structure, the cement foundation pit 4 and each steel bar 5 are welded and fixed as an integral structure, the concrete 6 is injected into the cement foundation pit 4 through the upper plate drainage hole 2-2 of the upper support plate 2 and the lower plate drainage hole 3-2 of the lower support plate 3, and is poured, so that the concrete 6 fills all the gaps in the steel-concrete test platform, and the entire steel-concrete test platform is integrated with the cement foundation pit 4.

[0019] Optionally, in the steel-concrete test platform for the helicopter hub central part as described above,

[0020] The load-bearing bottom plate 7 is provided with mounting holes 7-1 corresponding to the positions of the connecting holes in the upper support plate 2 and the lower support plate 3;

[0021] For the completed test platform, the second nut 1-3 of each connecting screw 1-1 is unscrewed, the load-bearing bottom plate 7 is sleeved on the top end of each connecting screw 1-1 through the mounting holes, and then is placed on the top end surface of the upper support plate 2, and the second nut 1-3 is screwed into each connecting screw 1-1 from the top end to fix and connect the load-bearing bottom plate 7.

[0022] Optionally, in the steel-concrete test platform for the helicopter hub central part as described above,

[0023] The number and positions of the upper plate connecting holes 2-1 of the upper support plate 2, the lower plate connecting holes 3-1 of the lower support plate 3 and the mounting holes 7-1 of the load-bearing bottom plate 7 are one-to-one corresponding, and need to be integrally processed by matching drilling holes before installation.

[0024] Optionally, in the steel-concrete test platform for the helicopter hub central part as described above,

[0025] The load-bearing bottom plate 7 is provided with a plurality of load-bearing connecting holes 7-2 in the middle part, which are used to connect the rotor shaft of the heavy helicopter hub central part test device, and according to different interfaces of the rotor shaft, the load-bearing bottom plate 7 with different sizes of connecting hole positions is replaced.

[0026] The beneficial effects of the present application: the embodiment of the present application provides a steel frame concrete test platform for helicopter hub central part, based on the existing ordinary welded steel frame test platform which cannot meet the heavy machine hub central part large load loading requirements in the aspect of bearing; and aiming at the heavy helicopter hub central part large load loading test demand, the embodiment of the present application utilizes the structure form of the combination of columnar steel frame structure and steel frame concrete structure, forms a steel frame concrete test platform with hundred-ton large load variable bottom plate loading capacity. The steel frame concrete test platform provided by the embodiment of the present application has the following beneficial effects:

[0027] Firstly, the steel frame concrete test platform adopts the combination of columnar steel frame structure and steel frame concrete structure, can truly and accurately simulate the boundary conditions and loading characteristics of the helicopter hub central part, and through the test platform, the test load of the hub central part can be transmitted to the columnar steel frame structure, and then transmitted to the cement base pit through the reinforced concrete and extended out, forming a hub central part test platform capable of bearing hundred-ton large load;

[0028] Secondly, the steel frame concrete test platform fills the blank in the field of hundred-ton helicopter hub central part fatigue test device in China, improves the strength test level of the helicopter in China, and has important significance for the improvement of the national defense strength of China;

[0029] Thirdly, the steel frame concrete test platform is stable and reliable for heavy machine hub central part fatigue test; through test verification, it is found that the test platform can bear the hundred-ton large load coordinated loading of the heavy machine central part fatigue test;

[0030] Fourthly, the steel frame concrete test platform has simple structure and good economy, the test platform improves the connection strength, enhances the overall rigidity, and greatly improves the bearing capacity of the test platform to meet the load loading requirements of the heavy machine hub central part. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0032] Figure 1 A schematic view of the columnar steel frame structure in the steel frame concrete test platform for helicopter hub central part provided by the embodiment of the present application is shown in the figure;

[0033] Figure 2 A structure schematic view before filling the concrete in the steel frame concrete test platform for helicopter hub central part provided by the embodiment of the present application is shown in the figure;

[0034] Figure 3 A structure schematic view before filling the concrete in the steel frame concrete test platform for helicopter hub central part provided by the embodiment of the present application is shown in the figure;Figure 2 The embodiment provides a structural diagram of a columnar steel frame structure and a steel frame concrete structure combination in a steel frame concrete test platform for a helicopter hub central part.

[0035] Figure 4 The embodiment provides a structural diagram of an upper support plate in the columnar steel frame structure. Figure 1 The embodiment provides a structural diagram of an upper support plate in the columnar steel frame structure.

[0036] Figure 5 The embodiment provides a structural diagram of a lower support plate in the columnar steel frame structure. Figure 1 The embodiment provides a structural diagram of a lower support plate in the columnar steel frame structure.

[0037] Figure 6 The embodiment provides a structural diagram of a screw rod assembly in the columnar steel frame structure. Figure 1 The embodiment provides a structural diagram of a screw rod assembly in the columnar steel frame structure.

[0038] Figure 7 The embodiment provides a structural diagram of a screw rod assembly in the columnar steel frame structure. Figure 1 The embodiment provides a structural diagram of a screw rod assembly in the columnar steel frame structure.

[0039] Figure 8 The embodiment provides a structural diagram of a screw rod assembly in the columnar steel frame structure. Figure 1 The embodiment provides a structural diagram of a screw rod assembly in the columnar steel frame structure.

[0040] Figure 9 The embodiment provides a structural diagram of a screw rod assembly in the columnar steel frame structure. Figure 3 The embodiment provides a structural diagram of a screw rod assembly in the columnar steel frame structure. Specific embodiments

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in any manner without conflict.

[0042] As described above in the background, for the existing ordinary welded steel frame test platform of the conventional ball flexible hub central part, since the hub central part of the heavy helicopter bears a larger load compared with the existing model helicopter, it is difficult to use the existing welded steel frame test platform to realize the fatigue test loading.

[0043] To solve the above problems, the application provides a steel frame concrete test platform for a helicopter hub central part, since the existing ordinary welded steel frame test platform cannot meet the heavy machine hub central part large load loading requirement in the bearing aspect, therefore, the steel frame concrete test platform is formed by using the combination of the steel frame and the concrete, the test platform improves the connection strength, enhances the overall rigidity, greatly improves the bearing capacity of the test platform, so as to meet the heavy machine hub central part load loading requirement.

[0044] The following specific embodiments provided by the application can be combined with each other, and the same or similar concepts or processes can not be described in some embodiments.

[0045] Embodiment 1

[0046] The steel frame concrete test platform for the helicopter hub central part provided by the embodiment of the application mainly comprises two force bearing structures, which are a columnar steel frame structure and a steel frame concrete structure.

[0047] As shown in Figure 1 , it is a schematic view of the columnar steel frame structure in the steel frame concrete test platform for the helicopter hub central part provided by the embodiment of the application. The columnar steel frame structure in the embodiment of the application comprises a screw rod assembly 1, an upper support plate 2 and a lower support plate 3. The upper support plate 2 and the lower support plate 3 are provided with a plurality of groups of bolt holes corresponding in position, for fixing and installing one screw rod assembly 1 through each group of bolt holes, so as to fix and install the upper support plate 2 and the lower support plate 3 at the same axial position of each screw rod assembly 1. The installed columnar steel frame structure is placed in a cement base pit 4. As shown in Figure 1 , it is a schematic view of the columnar steel frame structure placed in the cement base pit.

[0048] Figure 2 It is a structural schematic view of the columnar steel frame structure and the steel frame concrete structure combination in the steel frame concrete test platform for the helicopter hub central part provided by the embodiment shown in Figure 3 , it is a structural schematic view of the columnar steel frame structure and the steel frame concrete structure combination in the steel frame concrete test platform for the helicopter hub central part provided by the embodiment shown in Figure 2 . Figure 2 Figure 3 ​As shown, the steel-framed concrete structure in this embodiment of the invention includes multiple reinforcing bars 5 and concrete 6 for pouring; the multiple reinforcing bars 5 penetrate the threaded rod assembly 1 of the columnar steel frame structure and the reserved steel frame in the cement pit 4 along the circumference of the cement pit 4, so as to connect the columnar steel frame structure and the cement pit 4 together through the form of steel mesh; the concrete 6 is injected into the cement pit 4 through the drainage holes on the upper support plate 2 and the lower support plate 3, so that the steel-framed concrete test platform and the cement pit 4 are integrated into one structure, and the load-bearing base plate 7 is fixedly installed on the top end face of the upper support plate 2; as Figure 3 As shown.

[0049] In one implementation of this invention, an embodiment of the upper and lower support plates in a columnar steel frame structure is provided. Figure 4 for Figure 1 The illustrated embodiment provides a schematic diagram of the upper support plate in the columnar steel frame structure. Figure 5 for Figure 1 The illustrated embodiment provides a schematic diagram of the lower support plate in the columnar steel frame structure.

[0050] In this implementation, the upper support plate 2 has multiple upper plate connecting holes 2-1 and upper plate drainage holes 2-2 arranged circumferentially, and the upper plate drainage hole 2-2 is located in the middle of the upper support plate 2. Similarly, the lower support plate 3 has multiple lower plate connecting holes 3-1 and lower plate drainage holes 3-2 arranged circumferentially, and the lower plate drainage hole 3-2 is located in the middle of the lower support plate 3. It should be noted that the upper plate connecting holes 2-1 and the lower plate connecting holes 3-1 are arranged in a one-to-one correspondence and are in the same vertical position.

[0051] In one implementation of this invention, an embodiment of the screw assembly in a columnar steel frame structure is provided. Figure 6 for Figure 1 The illustrated embodiment provides a schematic diagram of the screw assembly in the columnar steel frame structure.

[0052] In this implementation, each screw assembly 1 includes a connecting screw 1-1. A first nut 1-2 of a preset depth is screwed into the top of the connecting screw 1-1. After each connecting screw 1-1, which is fitted with the first nut 1-2, passes through the upper plate connecting hole 2-1 of the upper support plate 2 through its top end, a second nut 1-3 is screwed into the top end face of the upper support plate 2 from the top of each connecting screw 1-1 to fix the upper support plate 2 and each connecting screw 1-1 respectively. Figure 7 As shown, Figure 1 The illustrated embodiment provides a schematic diagram of the installation structure of the upper support plate and screw assembly in the columnar steel frame structure.

[0053] In this implementation, a third nut 1-4 of a preset depth is screwed into the bottom end of the connecting screw 1-1. Each connecting screw 1-1, after passing through the lower plate connecting hole 3-1 of the lower support plate 3 with its bottom end inserted into the third nut 1-4, is then screwed into the bottom end face of the lower support plate 3 using a fourth nut 1-5 to fix the lower support plate 3 and each connecting screw 1-1 respectively. Figure 8 As shown, Figure 1 The illustrated embodiment provides a schematic diagram of the installation structure of the upper support plate, screw assembly, and lower support plate in the columnar steel frame structure.

[0054] In specific implementation, refer to Figure 1 and Figure 6 As shown, the bottom end of part of the screw assembly 1 is equipped with adjusting nuts 1-6, which are used to adjust the levelness of the column steel frame structure after the column steel frame structure is placed into the cement foundation pit 4.

[0055] After the assembly, placement and leveling of the column steel frame structure are completed, multiple reinforcing bars 5 are connected through the threaded rod assembly 1 of the column steel frame structure and the reserved steel frame in the cement pit 4. Each reinforcing bar 5 is fixed to the threaded rod assembly 1 by welding, and each reinforcing bar 5 is fixed to the reserved steel frame in the cement pit 4 by welding, so that the column steel frame structure, the cement pit 4 and each reinforcing bar 5 form an inseparable whole structure.

[0056] Furthermore, concrete 6 is injected and poured into the cement pit 4 through the upper plate drainage hole 2-2 of the upper support plate 2 and the lower plate drainage hole 3-2 of the lower support plate 3, so that the concrete 6 fills all the gaps of the steel frame concrete test platform, and the entire steel frame concrete test platform and the cement pit 4 become an integrated structure.

[0057] The steel-framed concrete test platform provided by the present invention constrains the movement of the columnar steel frame structure in the plane. The loads transmitted to the columnar steel frame structure from the outside are then transmitted to the cement foundation pit 4 through the steel bars 5 and concrete 6 and extend outward, forming a test platform that can withstand loads of hundreds of tons.

[0058] In one implementation of this invention, an embodiment of the load-bearing base plate 7 is provided, such as... Figure 9 As shown, Figure 3 The illustrated embodiment provides a schematic diagram of the load-bearing base plate in the combined structure of the steel-framed concrete test platform. In this implementation, the load-bearing base plate 7 has mounting holes 7-1 corresponding to the connection holes in the upper support plate 2 and the lower support plate 3.

[0059] For the completed test platform, the second nut 1-3 on each connecting screw 1-1 is unscrewed, the load bearing bottom plate 7 is sleeved on the top end of each connecting screw 1-1 through each mounting hole, and then placed on the top end face of the upper support plate 2, and then the second nut 1-3 is screwed into each connecting screw 1-1 from the top end to fix the load bearing bottom plate 7.

[0060] It should be noted that the number and position of the upper plate connecting hole 2-1 of the upper support plate 2, the lower plate connecting hole 3-1 of the lower support plate 3 and the mounting hole 7-1 of the load bearing bottom plate 7 in the embodiment of the application are one-to-one corresponding, and need to be integrally processed by matching drilling holes before installation.

[0061] In a specific implementation, the middle part of the load bearing bottom plate 7 is provided with a plurality of load bearing connecting holes 7-2 for connecting the rotor shaft of the heavy helicopter hub central piece test device, and the load bearing bottom plate 7 with different sizes of connecting hole positions is replaced according to different interfaces of the rotor shaft.

[0062] The embodiment of the application provides a steel frame concrete test platform for a helicopter hub central piece, which is based on an existing ordinary welded steel frame test platform that cannot meet the large load loading requirement of the heavy helicopter hub central piece in terms of bearing, and in view of the large load loading test requirement of the heavy helicopter hub central piece, a steel frame concrete test platform with a large load variable bottom plate loading capacity of hundreds of tons is formed by using the combined structure of the columnar steel frame structure and the steel frame concrete structure in the embodiment of the application. The steel frame concrete test platform provided by the embodiment of the application has the following beneficial effects:

[0063] First, the steel frame concrete test platform adopts the combination of the columnar steel frame structure and the steel frame concrete structure, can accurately simulate the boundary conditions and load characteristics of the helicopter hub central piece, and can transmit the test load of the hub central piece to the columnar steel frame structure through the test platform, and then transmit the test load to the cement base pit through the reinforced concrete and extend it out, so that a hub central piece test platform capable of bearing a large load of hundreds of tons is formed.

[0064] Second, the steel frame concrete test platform fills the gap in the field of hundreds of tons of helicopter hub central piece fatigue test devices in China, improves the strength test level of helicopters in China, and has important significance for the improvement of the national defense power of China.

[0065] Third, the steel frame concrete test platform is stable and reliable for heavy helicopter hub central piece fatigue test, and the test platform can bear the hundreds of tons of large load coordinated loading of the heavy helicopter central piece fatigue test through test verification.

[0066] Fourth, the steel frame concrete test platform has simple structure and good economy, improves the connecting strength, enhances the overall rigidity, greatly improves the bearing capacity of the test platform, and meets the load loading requirements of the heavy machine hub central part.

[0067] Embodiment 2

[0068] The forming method of the steel frame concrete test platform for the helicopter hub central part provided by the embodiment of the application is described below.

[0069] As shown in Figures 1 to 9 , the steel frame concrete test platform for the helicopter hub central part provided by the embodiment of the application is formed by the following steps:

[0070] Step 1, first screw the connecting screw 1-1 into the matched first nut 1-2 to the required position, apply sealant around the first nut 1-2 after determining the distance, so that the first nut 1-2 is fixed at the end of the connecting screw 1-1, and initially form a screw assembly 1; a plurality of screw assemblies 1 are assembled in the same way as needed.

[0071] Step 2, the upper support plate 2 is assembled into a plurality of screw assemblies 1 through a plurality of upper plate connecting holes 2-1, and the upper support plate 2 is fixed in the screw assembly 1 by using the second nut 1-3; thus forming the rudiment of the cylindrical steel frame structure; as shown in Figure 8 , the installation structure of the upper support plate and the screw assembly.

[0072] Step 3, a plurality of third nuts 1-4 are screwed into the screw assembly 1 from the bottom of the cylindrical steel frame structure, i.e., the bottom end of the connecting screw 1-1, and the third nuts 1-4 are fixed in the screw assembly 1 after determining the distance and applying sealant around the third nuts 1-4; a plurality of third nuts 1-4 are assembled in the same way as needed.

[0073] Step 4, similar to steps 2 and 3, the lower support plate 3 is assembled into each screw assembly 1 from the bottom of the cylindrical steel frame structure, i.e., the bottom end of the connecting screw 1-1, and the lower support plate 3 is fixed in the screw assembly 1 by using the fourth nut 1-5; thus forming a complete cylindrical steel frame structure, as shown in Figure 8 , the structure is stable in stress and has large bearing capacity.

[0074] Step 5, the entire cylindrical steel frame structure is placed in the pre-prepared cement pit 4, and the levelness of the overall cylindrical steel frame structure is adjusted by adjusting the nuts 1-6 at the bottom ends of the plurality of screw assemblies 1, so that the levelness of the overall cylindrical steel frame structure meets the load loading requirements; as shown in Figure 1 .

[0075] It should be noted that the bottom end of the connecting screw 1-1 in part of the screw assembly 1 is equipped with an adjusting nut 1-6, which is used to adjust the levelness of the cylindrical steel frame structure.

[0076] Step 6: A plurality of steel bars 5 are used to penetrate the screw assembly 1 and the reserved steel frame in the cement foundation pit 4 along the circumferential direction of the cement foundation pit 4, so as to connect the cylindrical steel frame structure and the cement foundation pit 4 together in the form of steel bar meshing, and fix the steel bars 5 with the screw assembly 1 and the reserved steel frame in the cement foundation pit 4 by welding, so that the screw assembly 1, the upper support plate 2 and the lower support plate 3 in the cylindrical steel frame structure and the cement foundation pit 4, the steel bars 5 form an indivisible whole; as shown in the structure. Figure 2

[0077] Step 7: The cement 6 is injected into the cement foundation pit 4 through the upper plate drainage hole 2-2 in the upper support plate 2 and the lower plate drainage hole 3-2 in the lower support plate, and is poured, so that the cement 6 fills all the gaps in the steel frame cement test platform, and the entire steel frame cement test platform is integrated with the cement foundation pit 4; as shown in the structure. Figure 3

[0078] The steel frame cement test platform formed by the above steps 1 to 7 can constrain the movement of the cylindrical steel frame structure in the plane, and the load externally transmitted to the cylindrical steel frame structure is transmitted to the cement foundation pit 4 through the steel bars 5 and the cement 6 and is extended out, forming a test platform that can bear a hundred-ton load.

[0079] Step 8: After the cement pouring is completed, the second nut 1-3 on each screw assembly 1 is removed, so that the surface of the upper support plate 2 is in a flat and smooth state.

[0080] Step 9: A load-bearing bottom plate 7 is installed on the top end face of the upper support plate 2 of the test platform, each connecting screw 1-1 penetrates the mounting hole 7-1 of the load-bearing bottom plate 7 at the top end, and the load-bearing bottom plate 7 is placed on the surface of the upper support plate 2; then the second nut 1-3 is screwed into the upper end face of each screw assembly 1 again, which is used to fix the load-bearing bottom plate 7; as shown in the structure. Figure 3

[0081] Step 10: The connecting hole 7-2 on the load-bearing bottom plate 7 is used to connect the rotor shaft of the heavy helicopter hub central piece test device; and different sizes of connecting hole positions are replaced according to different interfaces of the rotor shaft.

[0082] ​​​It should be noted that in the embodiment of the present application, the mounting hole 7-1 (bolt hole) of the force bearing bottom plate 7, the upper plate connecting hole 2-1 (bolt hole) of the upper support plate, and the lower plate connecting hole 3-1 (bolt hole) of the lower support plate are stacked and installed together, and in order to prevent errors of the corresponding hole positions during installation, the bolt holes at the above three positions need to be improved in position accuracy by means of matching drilling holes before installation.

[0083] The steel frame concrete test platform for the helicopter hub central part formed by the method provided in the embodiment can accurately simulate the boundary conditions and withstand various load conditions of the hub central part during flight, meets the fatigue test of the central part, and meets the requirements of the hundred-ton load test. The steel frame concrete test platform fully utilizes the mixed strength effect of the steel frame and the concrete, is designed ingeniously, is good in economy, is stable in working performance, is good in adjustability, and is convenient for installation, disassembly and replacement of the large bottom plate. The entire central part test device is firmly fixed in the foundation pit and can provide a hundred-ton load support for the central part test platform.

[0084] Although the embodiments disclosed by the present application are as above, the content is only the embodiment adopted for the purpose of understanding the present application, and is not used to limit the present application. Any person skilled in the art of the present application can make any modification and change in the implementation form and details without departing from the spirit and scope of the present application, but the patent protection scope of the present application shall be subject to the scope defined by the appended claims.

Claims

1. A steel-framed concrete test platform for a helicopter rotor hub central component, characterized in that, include: The load-bearing base plate (7), column steel frame structure and steel frame concrete structure; The columnar steel frame structure includes a screw assembly (1), an upper support plate (2), and a lower support plate (3); the upper support plate (2) and the lower support plate (3) are provided with multiple sets of bolt holes corresponding to each position, for fixing one screw assembly (1) through each set of bolt holes, so as to fix the upper support plate (2) and the lower support plate (3) at the same axial position of each screw assembly (1); the installed columnar steel frame structure is placed in the cement foundation pit (4); The steel frame concrete structure includes multiple steel bars (5) and concrete (6) for pouring; the multiple steel bars (5) pass through the screw assembly (1) of the column steel frame structure and the reserved steel frame in the cement pit (4) along the circumference of the cement pit (4) to connect the column steel frame structure and the cement pit (4) together by means of steel bar mesh; the concrete (6) is injected into the cement pit (4) through the drainage holes on the upper support plate (2) and the lower support plate (3), so that the steel frame concrete test platform and the cement pit (4) are integrated into one structure, and the load-bearing base plate (7) is fixedly installed on the top end face of the upper support plate (2); The load-bearing base plate (7) has multiple load-bearing connection holes (7-2) in the middle for connecting the rotor shaft of the heavy helicopter rotor hub central component test device; and load-bearing base plates (7) with different sizes of connection holes are replaced according to the different interfaces of the rotor shaft.

2. The steel-framed concrete test platform for the central component of a helicopter rotor hub according to claim 1, characterized in that, In the aforementioned columnar steel frame structure The upper support plate (2) is provided with multiple upper plate connecting holes (2-1) and upper plate drainage holes (2-2) along the circumferential direction, with the upper plate drainage hole (2-2) provided in the middle. The lower support plate (3) is provided with multiple lower plate connecting holes (3-1) and lower plate drainage holes (3-2) along the circumferential direction, with the lower plate drainage hole (3-2) provided in the middle. The upper plate connecting holes (2-1) and the lower plate connecting holes (3-1) are provided in a one-to-one correspondence and have the same vertical position.

3. The steel-framed concrete test platform for the central component of a helicopter rotor hub according to claim 2, characterized in that, In the aforementioned columnar steel frame structure Each screw assembly (1) includes a connecting screw (1-1), and a first nut (1-2) of a preset depth is screwed into the top of the connecting screw (1-1). After the connecting screw (1-1) with the first nut (1-2) is inserted through the upper plate connecting hole (2-1) of the upper support plate (2) through its top end, a second nut (1-3) is screwed into the top end face of the upper support plate (2) from the top of each connecting screw (1-1) to fix the upper support plate (2) and each connecting screw (1-1) respectively.

4. The steel-framed concrete test platform for the central component of a helicopter rotor hub according to claim 3, characterized in that, In the aforementioned columnar steel frame structure Screw the third nut (1-4) to a preset depth into the bottom end of the connecting screw (1-1). After each connecting screw (1-1) with the third nut (1-4) inserted passes through the lower plate connecting hole (3-1) of the lower support plate (3) through its bottom end, the fourth nut (1-5) is screwed into the bottom end face of the lower support plate (3) from the bottom end of each connecting screw (1-1) to fix the lower support plate (3) and each connecting screw (1-1) respectively. The bottom end of some screw assembly (1) is equipped with adjusting nuts (1-6) for adjusting the level of the column steel frame structure after the column steel frame structure is placed into the cement pit (4).

5. The steel-framed concrete test platform for the central component of a helicopter rotor hub according to claim 4, characterized in that, After multiple reinforcing bars (5) pass through the threaded assembly (1) connecting the column steel frame structure and the reserved steel frame in the cement pit (4), each reinforcing bar (5) is fixed to the threaded assembly (1) and the reserved steel frame in the cement pit (4) by welding, so that the column steel frame structure, the cement pit (4) and each reinforcing bar (5) form an inseparable whole structure.

6. The steel-framed concrete test platform for the central component of a helicopter rotor hub according to claim 5, characterized in that, For the column steel frame structure, cement pit (4) and each steel bar (5) which are welded and fixed as an integral structure, concrete (6) is injected into the cement pit (4) through the upper plate drainage hole (2-2) of the upper support plate (2) and the lower plate drainage hole (3-2) of the lower support plate (3) and poured, so that the concrete (6) fills all the gaps of the steel frame concrete test platform, and the entire steel frame concrete test platform and the cement pit (4) are integrated into one structure.

7. The steel-framed concrete test platform for a helicopter rotor hub central component according to any one of claims 1 to 6, characterized in that, The load-bearing base plate (7) is provided with mounting holes (7-1) that correspond to the positions of the connecting holes in the upper support plate (2) and the lower support plate (3). For the test platform that has been poured, the second nut (1-3) on each connecting screw (1-1) is unscrewed, and the load-bearing base plate (7) is put on the top end face of the upper support plate (2) after being installed through each mounting hole from the top of each connecting screw (1-1). Then, the second nut (1-3) is screwed into each connecting screw (1-1) from the top to fix the load-bearing base plate (7).

8. The steel-framed concrete test platform for the central component of a helicopter rotor hub according to claim 7, characterized in that, The number and position of the upper plate connecting hole (2-1) of the upper support plate (2), the lower plate connecting hole (3-1) of the lower support plate (3) and the mounting hole (7-1) of the load-bearing base plate (7) are one-to-one correspondences. Before installation, they need to be processed as a whole by drilling holes.

Images