Steel frame concrete test platform for helicopter propeller hub central part

Abstract

The invention discloses a steel frame concrete test platform for a helicopter propeller hub central part. The steel frame concrete test platform comprises a bearing bottom plate, a cylindrical steel frame structure and a steel frame concrete structure, the cylindrical steel frame structure comprises a screw assembly, an upper supporting plate and a lower supporting plate. The upper supporting plate and the lower supporting plate are provided with a plurality of sets of bolt holes corresponding in position, and one screw assembly is fixedly installed through each set of bolt holes, so that the upper supporting plate and the lower supporting plate are fixedly installed at the same axial position of each screw assembly. The mounted cylindrical steel frame structure is integrally placed in a cement foundation pit; the steel frame concrete structure comprises a plurality of steel bars and concrete used for pouring. A plurality of reinforcing steel bars penetrate through the screw rod assembly of the cylindrical steel frame structure and a reserved steel frame in the cement foundation pit in the circumferential direction of the cement foundation pit, so that the cylindrical steel frame structure and the cement foundation pit are connected together in a reinforcing steel bar net arrangement mode; concrete is injected into the cement foundation pit through the drainage holes in the upper supporting plate and the lower supporting plate, so that the steel frame concrete test platform and the cement foundation pit are integrated, and the force bearing bottom plate is fixedly installed on the top end face of the upper supporting plate. According to the technical scheme, the problem that fatigue test loading is difficult to realize by using an existing welding type steel frame test platform for an existing common welding type steel frame test platform for a conventional ball flexible propeller hub central piece due to the fact that the propeller hub central piece of a heavy helicopter bears a larger load compared with a helicopter of an existing model is solved.

Description

Technical Field

[0001] The present invention relates to the field of, but is not limited to, a large-load stress test technology for a helicopter hub central component, and in particular to a steel frame concrete test platform for a helicopter hub central component. Background Art

[0002] As one of the core components of the helicopter rotor system, the hub centerpiece is a key stress-bearing component on the helicopter. It bears the centrifugal force, lift, flapping force, swing force, and damping force transmitted by the blades, and its stress conditions are very complex. Therefore, the fatigue life of the hub centerpiece directly affects the service life of the entire helicopter, and its performance directly affects the strength and flight safety of the helicopter.

[0003] The heavy helicopter rotor hub is expanded from 5 arms to 7 arms, the elastic bearing is changed from the original single ball flexible elastic bearing to a combined elastic bearing, and the blade length is twice that of the 13-ton blade; therefore, the hub centerpiece will bear a greater load. Therefore, the existing ordinary welded steel frame test platform for the conventional ball flexible hub centerpiece can no longer meet the loading requirements of the fatigue test of the 100-ton heavy hub centerpiece. Summary of the invention

[0004] Purpose of the present invention: In order to solve the above-mentioned problems, an embodiment of the present invention provides a steel frame concrete test platform for a helicopter hub center piece, so as to solve the problem that the existing ordinary welded steel frame test platform for the conventional spherical flexible hub center piece is difficult to use the existing welded steel frame test platform to achieve its fatigue test loading because the hub center piece of a heavy helicopter bears a greater load than that of existing models of helicopters.

[0005] The technical solution of the present invention: The embodiment of the present invention provides a steel frame concrete test platform for a helicopter hub center piece, comprising: a load-bearing bottom plate 7, a columnar steel frame structure and a steel frame concrete structure;

[0006] 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 a plurality of groups of bolt holes corresponding to the positions, and one screw assembly 1 is fixedly installed through each group of bolt holes, so that the upper support plate 2 and the lower support plate 3 are fixedly installed at the same axial position of each screw assembly 1; the installed columnar steel frame structure is placed as a whole in a cement foundation pit 4;

[0007] The steel frame concrete structure includes multiple steel bars 5 and concrete 6 for pouring; multiple steel bars 5 penetrate the screw assembly 1 of the columnar steel frame structure and the reserved steel frame in the cement foundation pit 4 along the circumference of the cement foundation pit 4, so as to connect the columnar steel frame structure and the cement foundation pit 4 together through the form of a steel mesh; 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 and the cement foundation pit 4 are integrated into a structure, and the load-bearing base 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 centerpiece as described above, in the columnar steel frame structure,

[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 along the circumferential direction, and the upper plate drainage hole 2-2 is provided in the middle thereof; the lower support plate 3 is provided with a plurality of lower plate connecting holes 3-1 and lower plate drainage holes 3-2 along the circumferential direction, and the lower plate drainage hole 3-2 is provided in the middle thereof; the upper plate connecting holes 2-1 and the lower plate connecting holes 3-1 are provided in one-to-one correspondence and have the same vertical position.

[0010] Optionally, in the steel frame concrete test platform for the helicopter hub centerpiece as described above, in the columnar steel frame structure,

[0011] 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, and after each connecting screw 1-1 loaded 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 used to screw from the top of each connecting screw 1-1 to the top end surface of the upper support plate 2 to respectively fix the upper support plate 2 and each connecting screw 1-1.

[0012] Optionally, in the steel frame concrete test platform for the helicopter hub centerpiece as described above, in the columnar steel frame structure,

[0013] A third nut 1-4 of a preset depth is screwed into the bottom end of the connecting screw 1-1. After each connecting screw 1-1 loaded with the third nut 1-4 passes through the lower plate connecting hole 3-1 of the lower support plate 3 through its bottom end, a fourth nut 1-5 is screwed into the bottom end surface 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;

[0014] The bottom end of some screw rod assemblies 1 is equipped with adjusting nuts 1-6, which are used to adjust the horizontality of the columnar steel frame structure through the adjusting nuts 1-6 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 centerpiece as described above,

[0016] After multiple steel bars 5 penetrate the screw assembly 1 connecting the columnar steel frame structure and the reserved steel frame in the cement foundation pit 4, each steel bar 5 is fixed to the screw assembly 1 and the reserved steel frame in the cement foundation pit 4 by welding, so that the columnar steel frame structure, the cement foundation pit 4 and each steel bar 5 form an inseparable whole structure.

[0017] Optionally, in the steel frame concrete test platform for the helicopter hub centerpiece as described above,

[0018] For the columnar steel frame structure, cement foundation pit 4 and each steel bar 5 that are welded and fixed as an integral structure, concrete 6 is injected into the cement foundation pit 4 through the upper plate drainage holes 2-2 of the upper support plate 2 and the lower plate drainage holes 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 foundation pit 4 are integrated into a structure.

[0019] Optionally, in the steel frame concrete test platform for the helicopter hub centerpiece as described above,

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

[0021] For the test platform that has been cast, unscrew the second nut 1-3 on each connecting screw 1-1, and install the load-bearing base plate 7 through each mounting hole from the top of each connecting screw 1-1, place it on the top end surface of the upper support plate 2, and then use the second nut 1-3 to screw into each connecting screw 1-1 from the top to fix the load-bearing base plate 7.

[0022] Optionally, in the steel frame concrete test platform for the helicopter hub centerpiece as described above,

[0023] The number and position of the upper plate connection holes 2-1 of the upper support plate 2, the lower plate connection holes 3-1 of the lower support plate 3 and the mounting holes 7-1 of the load-bearing bottom plate 7 correspond one to one, and they need to be processed as a whole by drilling holes before installation.

[0024] Optionally, in the steel frame concrete test platform for the helicopter hub centerpiece as described above,

[0025] The middle of the load-bearing base plate 7 is provided with a plurality of load-bearing connection holes 7-2 for connecting the rotor shaft of the heavy helicopter hub central component test device; and according to the different interfaces of the rotor shaft, the load-bearing base plate 7 with connection holes of different sizes can be replaced.

[0026] Beneficial effects of the invention: The embodiment of the invention provides a steel frame concrete test platform for the central part of a helicopter hub. The existing common welded steel frame test platform can no longer meet the large load requirements of the central part of a heavy helicopter hub in terms of load bearing. In view of the large load test requirements of the central part of a heavy helicopter hub, the embodiment of the invention uses a structural form of a combination of a columnar steel frame structure and a steel frame concrete structure to form a steel frame concrete test platform with a large load variable bottom plate loading capacity of hundreds of tons. The steel frame concrete test platform provided by the embodiment of the invention has the following beneficial effects:

[0027] First, the steel frame concrete test platform adopts a combination of columnar steel frame structure and steel frame concrete structure, which can truly and accurately simulate the boundary conditions and load characteristics of the helicopter hub center part. Through this test platform, the hub center part test load can be transferred to the columnar steel frame structure, and then transferred to the cement foundation pit through reinforced concrete and extended out, forming a hub center part test platform that can withstand a large load of hundreds of tons;

[0028] Second, the steel frame concrete test platform fills the gap in the field of fatigue test equipment for the central part of the 100-ton helicopter hub in China, improves the strength test level of my country's helicopters, and is of great significance to the enhancement of my country's national defense strength;

[0029] Third, the steel frame concrete test platform was used to carry out fatigue tests on the central parts of heavy-duty aircraft hubs. The test platform is stable and reliable. Tests have proven that the test platform can withstand the coordinated loading of a large load of hundreds of tons in fatigue tests on the central parts of heavy-duty aircraft.

[0030] Fourth, the steel frame concrete test platform has a simple structure and good economy. The test platform improves the connection strength, enhances the overall rigidity, and greatly improves the carrying capacity of the test platform to meet the load loading requirements of the central part of the heavy-duty engine hub. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0032] Figure 1 A schematic diagram of a cylindrical steel frame structure in a steel frame concrete test platform for a helicopter hub centerpiece provided by an embodiment of the present invention;

[0033] Figure 2 A schematic structural diagram of a steel frame concrete test platform for a helicopter hub center piece before being filled with concrete, provided in an embodiment of the present invention;

[0034] Figure 3 for Figure 2 A schematic structural diagram of a combination of a columnar steel frame structure and a steel frame concrete structure in a steel frame concrete test platform for a helicopter hub centerpiece provided by the illustrated embodiment;

[0035] Figure 4 for Figure 1 A schematic structural diagram of an upper support plate in a columnar steel frame structure provided in the illustrated embodiment;

[0036] Figure 5 for Figure 1 A schematic structural diagram of a lower support plate in a columnar steel frame structure provided in the illustrated embodiment;

[0037] Figure 6 for Figure 1 A schematic structural diagram of a screw assembly in a columnar steel frame structure provided by the illustrated embodiment;

[0038] Figure 7 for Figure 1 A schematic diagram of the installation structure of the upper support plate and the screw assembly in the columnar steel frame structure provided by the illustrated embodiment;

[0039] Figure 8 for Figure 1 A schematic diagram of the installation structure of the upper support plate, the screw rod assembly and the lower support plate in the columnar steel frame structure provided by the illustrated embodiment;

[0040] Fig. 9 for Figure 3 The illustrated embodiment is a schematic structural diagram of a load-bearing base plate in a combined structure of a steel frame concrete test platform. Specific implementation plan

[0041] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0042] The above background technology has explained that for the existing ordinary welded steel frame test platform of the conventional spherical flexible hub center piece, it is difficult to use the existing welded steel frame test platform to achieve the problem of fatigue test loading because the hub center piece of the heavy helicopter bears a greater load than the existing model helicopters.

[0043] In order to solve the above problems, the present invention provides a steel frame concrete test platform for the central part of a helicopter hub. Since the existing ordinary welded steel frame test platform can no longer meet the large load loading requirements of the central part of a heavy-duty helicopter hub in terms of load-bearing, a steel frame concrete test platform is formed by combining a steel frame and concrete. The test platform has improved connection strength, enhanced overall rigidity, and greatly improved the load-bearing capacity of the test platform to meet the load loading requirements of the central part of a heavy-duty helicopter hub.

[0044] The present invention provides the following specific embodiments which can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments.

[0045] Example 1

[0046] An embodiment of the present invention provides a steel frame concrete test platform for a helicopter hub center piece. The steel frame concrete test platform mainly consists of two load-bearing structures, namely: a columnar steel frame structure and a steel frame concrete structure. In addition, it also has a load-bearing bottom plate 7.

[0047] like Figure 1 As shown, it is a schematic diagram of a columnar steel frame structure in a steel frame concrete test platform for a helicopter hub centerpiece provided by an embodiment of the present invention. The columnar steel frame structure in the embodiment of the present invention 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 a plurality of groups of bolt holes corresponding to the positions, which are used to fix and install one screw 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 assembly 1; the installed columnar steel frame structure is placed as a whole in a cement foundation pit 4; as shown in FIG. Figure 1 As shown, this is a schematic diagram of the cylindrical steel frame structure placed in a cement foundation pit.

[0048] Figure 2 A schematic diagram of the structure of a steel frame concrete test platform for a helicopter hub center piece before being filled with concrete, provided in an embodiment of the present invention. Figure 3 for Figure 2 The illustrated embodiment provides a structural schematic diagram of a combination of a columnar steel frame structure and a steel frame concrete structure in a steel frame concrete test platform for a helicopter hub centerpiece. Figure 2 and Figure 3As shown, the steel frame concrete structure in the embodiment of the present invention includes a plurality of steel bars 5 and concrete 6 for pouring; the plurality of steel bars 5 penetrate the screw assembly 1 of the columnar steel frame structure and the reserved steel frame in the cement foundation pit 4 along the circumference of the cement foundation pit 4, so as to 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 and the cement foundation pit 4 are integrated into a structure, and the bearing bottom plate 7 is fixedly installed on the top end surface of the upper support plate 2; as shown Figure 3 shown.

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

[0050] In this implementation, the upper support plate 2 is provided with a plurality of upper plate connection holes 2-1 and upper plate drainage holes 2-2 along the circumferential direction, and the upper plate drainage hole 2-2 is provided in the middle of the upper support plate 2. In addition, the lower support plate 3 is provided with a plurality of lower plate connection holes 3-1 and lower plate drainage holes 3-2 along the circumferential direction, and the lower plate drainage hole 3-2 is provided in the middle of the lower support plate 3. It should be noted that the upper plate connection holes 2-1 and the lower plate connection holes 3-1 are provided in a one-to-one correspondence and have the same vertical position.

[0051] In one implementation of the present invention, an implementation of a screw assembly in a columnar steel frame structure is provided. Figure 6 for Figure 1 The illustrated embodiment provides a schematic structural diagram of a screw assembly in a 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, and each connecting screw 1-1 loaded with the first nut 1-2 passes through the top of the upper plate connecting hole 2-1 of the upper support plate 2, and then a second nut 1-3 is screwed from the top of each connecting screw 1-1 to the top end surface of the upper support plate 2 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 the 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, and after each connecting screw 1-1 loaded with the third nut 1-4 passes through the bottom end thereof through the lower plate connecting hole 3-1 of the lower support plate 3, a fourth nut 1-5 is screwed into the bottom end surface 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; Figure 8 As shown, Figure 1 The illustrated embodiment provides a schematic diagram of the installation structure of an upper support plate, a screw rod assembly and a lower support plate in a columnar steel frame structure.

[0054] In the specific implementation, refer to Figure 1 and Figure 6 As shown, the bottom end of the partial screw assembly 1 is equipped with an adjusting nut 1-6, which is used to adjust the horizontality of the columnar steel frame structure through the adjusting nut 1-6 after the columnar steel frame structure is placed in the cement foundation pit 4.

[0055] After completing the assembly, placement and horizontal adjustment of the columnar steel frame structure, a plurality of steel bars 5 penetrate through the screw assembly 1 connecting the columnar steel frame structure and the reserved steel frame in the cement foundation pit 4, and then each steel bar 5 is fixed to the screw assembly 1 by welding, and each steel bar 5 is fixed to the reserved steel frame in the cement foundation pit 4 by welding, so that the columnar steel frame structure, the cement foundation pit 4 and each steel bar 5 form an inseparable integral structure.

[0056] Furthermore, for the columnar steel frame structure, cement foundation pit 4 and each steel bar 5 that are welded and fixed into an integral structure, concrete 6 is injected into the cement foundation pit 4 and poured through the upper plate drainage holes 2-2 of the upper support plate 2 and the lower plate drainage holes 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 foundation pit 4 are integrated into a structure.

[0057] The steel frame concrete test platform provided by the present invention constrains the movement of the columnar steel frame structure within the plane, and the load transmitted to the columnar steel frame structure from the outside is transmitted to the cement foundation pit 4 through the steel bars 5 and concrete 6 and extends out, forming a test platform that can withstand loads of hundreds of tons.

[0058] In one implementation of the embodiment of the present invention, an implementation scheme of the load-bearing bottom plate 7 is provided, such as Fig. 9 As shown, Figure 3 The structural schematic diagram of the load-bearing base plate in the combined structure of the steel frame concrete test platform provided in the embodiment shown. The load-bearing base plate 7 in this implementation is provided with mounting holes 7-1 corresponding to the positions of the connection holes in the upper support plate 2 and the lower support plate 3.

[0059] For the test platform that has been cast, unscrew the second nut 1-3 on each connecting screw 1-1, and install the load-bearing base plate 7 through each mounting hole from the top of each connecting screw 1-1, place it on the top end surface of the upper support plate 2, and then use the second nut 1-3 to screw into each connecting screw 1-1 from the top to fix the load-bearing base plate 7.

[0060] It should be noted that, in the embodiment of the present invention, the number and position 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 base plate 7 correspond one to one, and they need to be processed as a whole by drilling holes before installation.

[0061] In the specific implementation, a plurality of load-bearing connection holes 7-2 are opened in the middle of the load-bearing base plate 7 for connecting the rotor shaft of the heavy helicopter hub central part test device; and according to the different interfaces of the rotor shaft, the load-bearing base plate 7 with connection holes of different sizes is replaced.

[0062] The embodiment of the present invention provides a steel frame concrete test platform for the central part of a helicopter hub. The existing common welded steel frame test platform can no longer meet the large load requirements of the central part of a heavy helicopter hub in terms of load bearing. In view of the large load test requirements of the central part of a heavy helicopter hub, the embodiment of the present invention uses a structural form of a combination of a columnar steel frame structure and a steel frame concrete structure to form a steel frame concrete test platform with a large load variable bottom plate loading capacity of hundreds of tons. The steel frame concrete test platform provided by the embodiment of the present invention has the following beneficial effects:

[0063] First, the steel frame concrete test platform adopts a combination of columnar steel frame structure and steel frame concrete structure, which can truly and accurately simulate the boundary conditions and load characteristics of the helicopter hub center part. Through this test platform, the hub center part test load can be transferred to the columnar steel frame structure, and then transferred to the cement foundation pit through reinforced concrete and extended out, forming a hub center part test platform that can withstand a large load of hundreds of tons;

[0064] Second, the steel frame concrete test platform fills the gap in the field of fatigue test equipment for the central part of the 100-ton helicopter hub in China, improves the strength test level of my country's helicopters, and is of great significance to the enhancement of my country's national defense strength;

[0065] Third, the steel frame concrete test platform was used to carry out fatigue tests on the central parts of heavy-duty aircraft hubs. The test platform is stable and reliable. Tests have proven that the test platform can withstand the coordinated loading of a large load of hundreds of tons in fatigue tests on the central parts of heavy-duty aircraft.

[0066] Fourth, the steel frame concrete test platform has a simple structure and good economy. The test platform improves the connection strength, enhances the overall rigidity, and greatly improves the carrying capacity of the test platform to meet the load loading requirements of the central part of the heavy-duty engine hub.

[0067] Example 2

[0068] The following is a schematic illustration of the formation method of the steel frame concrete test platform for the helicopter hub center piece provided by an embodiment of the present invention.

[0069] like Figures 1 to 9 As shown, the steel frame concrete test platform for the helicopter hub centerpiece provided by the embodiment of the present invention is formed by the following steps:

[0070] Step 1, first screw the connecting screw 1-1 into the matching first nut 1-2 and to the required position, and after determining the distance, apply sealant around the first nut 1-2 to fix the first nut 1-2 at the fixed position at the end of the connecting screw 1-1 to preliminarily form a screw assembly 1; use the same method to assemble multiple screw assemblies 1 as needed.

[0071] Step 2, insert the upper support plate 2 into the multiple screw assembly 1 through the multiple upper plate connection holes 2-1, and then use the second nut 1-3 to fix the upper support plate 2 in the bolt assembly 1; this forms the prototype of the columnar steel frame structure; Figure 8 The installation structure of the upper support plate and the screw assembly is shown.

[0072] Step 3, screw multiple third nuts 1-4 from the bottom of the columnar steel frame structure, that is, the bottom end of the connecting screw 1-1 upward into the bolt assembly 1, and after determining the distance, apply sealant around the third nuts 1-4 to fix the third nuts 1-4 on the screw assembly 1; use the same method to install multiple third nuts 1-4 as needed.

[0073] Step 4, similar to Step 2 and Step 3, the lower support plate 3 is installed from the bottom of the columnar steel frame structure, that is, the bottom end of the connecting screw 1-1, into each screw assembly 1, and then the lower support plate 3 is fixed in the screw assembly 1 with the fourth nut 1-5; thus, a complete columnar steel frame structure is formed, such as Figure 8 As shown, the structure is stable in stress and has large bearing capacity.

[0074] Step 5, place the entire columnar steel frame structure into the pre-prepared cement foundation pit 4, and adjust the levelness of the entire columnar steel frame structure through the nuts 1-6 at the bottom ends of the multiple screw rod assemblies 1, so that the levelness of the entire columnar steel frame structure meets the load loading requirements; Figure 1 shown.

[0075] It should be noted that, in some screw rod assemblies 1, the bottom end of the connecting screw rod 1-1 is provided with an adjusting nut 1-6 for adjusting the horizontality of the columnar steel frame structure.

[0076] Step 6, using a plurality of steel bars 5 to penetrate the screw assembly 1 of the columnar steel frame structure and the reserved steel frame in the cement foundation pit 4 along the circumference of the cement foundation pit 4, so as to connect the columnar steel frame structure and the cement foundation pit 4 together in the form of a steel mesh, and by welding the steel bars 5 and the screw assembly 1, and welding the steel bars 5 and the reserved steel frame in the cement foundation pit 4, the screw assembly 1, the upper support plate 2, the lower support plate 3 in the columnar steel frame structure and the cement foundation pit 4, the steel bars 5 form an inseparable whole; Figure 2 The structure shown.

[0077] Step 7, inject concrete 6 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, 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 foundation pit 4 are integrated into a structure; Figure 3 shown.

[0078] The steel frame concrete test platform formed through the above steps 1 to 7 constrains the movement of the columnar steel frame structure within the plane. The load transmitted to the columnar steel frame structure from the outside is then transmitted to the cement foundation pit 4 through the steel bars 5 and concrete 6 and extends out, forming a test platform that can withstand a load of hundreds of tons.

[0079] Step 8, after the concrete pouring is completed, the second nuts 1-3 on each screw assembly 1 are removed to make the surface of the upper support plate 2 flat and smooth.

[0080] Step 9, install the load-bearing base plate 7 on the top end surface of the upper support plate 2 of the test platform, and each connecting screw 1-1 passes through the mounting hole 7-1 of the load-bearing base plate 7 with its top end, and place the load-bearing base plate 7 on the surface of the upper support plate 2; then use the second nut 1-3 to re-screw it into the upper end surface of each bolt assembly 1 to fix the load-bearing base plate 7; Figure 3 shown.

[0081] Step 10, the connection hole 7-2 on the load-bearing base plate 7 is used to connect the rotor shaft of the heavy helicopter hub centerpiece test device; and the connection holes of different sizes are replaced according to the different interfaces of the rotor shaft.

[0082] It should be noted that, in the embodiment of the present invention, the mounting hole 7-1 (bolt hole) of the load-bearing base 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 installed together in a stacked manner. In order to prevent errors in the corresponding hole positions during the installation process, the bolt holes in the above three locations need to be drilled before installation to improve their position accuracy.

[0083] The steel frame concrete test platform for the helicopter hub center piece formed by the method provided in this embodiment can accurately simulate the boundary conditions of the hub center piece during flight and withstand various load conditions, meet the fatigue test of the center piece, and reach the requirements of the 100-ton large load loading test. The steel frame concrete test platform makes full use of the mixed strength effect of the steel frame and concrete, has a clever design, good economy, stable working performance, good adjustability, and a large base plate for easy installation, disassembly and replacement. The entire center piece test device is firmly fixed in the foundation pit and can provide 100-ton large load support for the center piece test bench.

[0084] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A steel frame concrete test platform for helicopter hub centerpiece, characterized in that: include: A load-bearing base plate (7), a columnar steel frame structure and a steel frame concrete structure; The columnar steel frame structure comprises 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 a plurality of groups of bolt holes corresponding to each other, and are used to fix and install one screw 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 assembly (1); the installed columnar steel frame structure is placed as a whole in a cement foundation pit (4); The steel frame concrete structure comprises a plurality of steel bars (5) and concrete (6) for pouring; the plurality of steel bars (5) penetrate the screw assembly (1) of the columnar steel frame structure and the reserved steel frame in the cement foundation pit (4) along the circumference of the cement foundation pit (4), so as to 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 and the cement foundation pit (4) are integrated into a structure, and the load-bearing bottom plate (7) is fixedly installed on the top end surface of the upper support plate (2).

2. The steel frame concrete test platform for helicopter hub centerpiece according to claim 1, characterized in that: In the columnar steel frame structure, The upper support plate (2) is provided with a plurality of upper plate connection holes (2-1) and upper plate drainage holes (2-2) along the circumferential direction, wherein the upper plate drainage hole (2-2) is provided in the middle; the lower support plate (3) is provided with a plurality of lower plate connection holes (3-1) and lower plate drainage holes (3-2) along the circumferential direction, wherein the lower plate drainage hole (3-2) is provided in the middle; the upper plate connection holes (2-1) and the lower plate connection holes (3-1) are provided in a one-to-one correspondence and have the same vertical position.

3. The steel frame concrete test platform for the helicopter hub centerpiece according to claim 2, characterized in that: In the columnar steel frame structure, Each screw assembly (1) comprises a connecting screw (1-1), a first nut (1-2) screwed into a preset depth from the top end of the connecting screw (1-1), and after each connecting screw (1-1) inserted into the first nut (1-2) passes through the top end of the upper plate connecting hole (2-1) of the upper support plate (2), a second nut (1-3) is screwed from the top end of each connecting screw (1-1) into the top end surface of the upper support plate (2) to respectively fix the upper support plate (2) and each connecting screw (1-1).

4. The steel frame concrete test platform for helicopter hub centerpiece according to claim 3, characterized in that: In the columnar steel frame structure, A third nut (1-4) is screwed into the bottom end of the connecting screw (1-1) to a preset depth, and after each connecting screw (1-1) loaded with the third nut (1-4) passes through the bottom end of the lower plate connecting hole (3-1) of the lower support plate (3), a fourth nut (1-5) is screwed into the bottom end surface 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 the partial screw assembly (1) is equipped with an adjusting nut (1-6) for adjusting the horizontality of the columnar steel frame structure through the adjusting nut (1-6) after the columnar steel frame structure is placed in the cement foundation pit (4).

5. The steel frame concrete test platform for the helicopter hub centerpiece according to claim 4, characterized in that: After a plurality of steel bars (5) penetrate and connect the screw rod assembly (1) of the columnar steel frame structure and the reserved steel frame in the cement foundation pit (4), each steel bar (5) is fixed to the screw rod assembly (1) and each steel bar (5) to the reserved steel frame in the cement foundation pit (4) by welding, so that the columnar steel frame structure, the cement foundation pit (4) and each steel bar (5) form an inseparable integral structure.

6. The steel frame concrete test platform for helicopter hub centerpiece according to claim 5, characterized in that: Concrete (6) is injected and poured into the cement foundation pit (4) through the upper plate drainage holes (2-2) of the upper support plate (2) and the lower plate drainage holes (3-2) of the lower support plate (3) for the columnar steel frame structure, cement foundation pit (4) and each steel bar (5) that are welded and fixed to form an integral structure, so that the concrete (6) is filled into all the gaps of the steel frame concrete test platform, and the entire steel frame concrete test platform and the cement foundation pit (4) are integrated into a structure.

7. The steel frame concrete test platform for helicopter hub centerpiece according to any one of claims 1 to 6, characterized in that: The load-bearing bottom plate (7) is provided with mounting holes (7-1) corresponding to the positions of the connection holes in the upper support plate (2) and the lower support plate (3); For the test platform that has been cast, the second nut (1-3) on each connecting screw (1-1) is screwed out, and the load-bearing base plate (7) is inserted from the top of each connecting screw (1-1) through each mounting hole and placed on the top end surface of the upper support plate (2). 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 frame concrete test platform for the helicopter hub centerpiece according to claim 7, characterized in that: The number and position of the upper plate connection holes (2-1) of the upper support plate (2), the lower plate connection holes (3-1) of the lower support plate (3) and the mounting holes (7-1) of the load-bearing bottom plate (7) correspond one to one, and they need to be processed as a whole by drilling holes before installation.

9. The steel frame concrete test platform for helicopter hub centerpiece according to claim 7, characterized in that: The load-bearing base plate (7) is provided with a plurality of load-bearing connection holes (7-2) in the middle thereof, which are used to connect the rotor shaft of a heavy helicopter hub centerpiece test device; and the load-bearing base plate (7) with connection holes of different sizes can be replaced according to different interfaces of the rotor shaft.

Images