Helicopter mast platform load calibration table

Abstract

The invention provides a helicopter mast platform load calibration table. The helicopter mast platform load calibration table comprises a double-layer rack, a loading plate (8), a tightness adjusting device and a force sensor, the double-layer rack comprises a top plate (1), lateral plates (5), a lower supporting table (6), a bottom plate and square stand columns (2). The lower supporting table (6) is used for fixing the calibration component (11), and the loading plate (8) is connected to the top of the calibration component (11); two opposite angles of the loading plate (8) are respectively connected to the two opposite lateral plates (5) through a tightness adjusting device and a force sensor; the top surface and the bottom surface of the loading plate (8) are respectively connected to the top plate (1) and the bottom plate through a tightness adjusting device and a force sensor; and the loading of a torque load and a section bending moment load is realized by adjusting the expansion and contraction of the tightness adjusting device. The calibration device is reasonable in structure, simple in layout and convenient to disassemble, assemble and maintain, and calibration of various parts and multi-load states can be carried out.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of helicopter body component load measurement, and relates to a helicopter mast platform load calibration platform. BACKGROUND

[0002] The helicopter rotor and mast platform are one of the most important components of the body structure, and pre-flight load calibration is an essential part. The helicopter mast platform connects the rotor hub, stationary ring and other key components of the helicopter, and is used to install various types of radars of the helicopter. The helicopter mast platform includes multiple cylindrical components of different sizes, and is subjected to torque load, bending moment load and axial compression load.

[0003] In the past, when similar load calibration was performed, a special tool was often used to fix the component to be calibrated on the platform of an electronic press or on a stand, and a unidirectional load was applied. The tool is often designed specifically for different components. When applying axial load to the cylindrical component with an electronic press, it is convenient, but when applying torque around the shaft or bending moment perpendicular to the shaft, a special tool needs to be designed to apply it, and it is limited by the size of the platform of the electronic press, which makes it inconvenient to apply. When the radial size / axial size of the component is small, it is not easy to apply. SUMMARY

[0004] The present application provides a helicopter mast platform load calibration platform, which can accurately apply load and is convenient to implement.

[0005] The present application provides a helicopter mast platform load calibration platform, which includes a double-layer rack and a loading plate 8, a tension adjustment device, and a force sensor. The double-layer rack includes a top plate 1, a lateral plate 5, a lower support table 6, a bottom plate, and a square column 2. The lower support table 6 is used to fix the calibration component 11, and the loading plate 8 is connected to the top of the calibration component 11. The two opposite corners of the loading plate 8 are connected to the two oppositely arranged lateral plates 5 through the tension adjustment device and the force sensor, respectively. The top surface and the bottom surface of the loading plate 8 are connected to the top plate 1 and the bottom plate through the tension adjustment device and the force sensor, respectively. The tension adjustment device is adjusted to stretch or contract, thereby realizing the loading of the torque load and the cross-sectional bending moment load.

[0006] Optionally, the tension adjustment device includes a variable pitch device 3. One end of the variable pitch device 3 is connected to the loading plate 8 through the force sensor, and the other end is fixed on the lateral plate 5. The adjusting end passes through the lateral plate 5 and is connected to the inner hexagonal wrench 4. By rotating the inner hexagonal wrench 4, the adjusting end is rotated, thereby adjusting the length of the variable pitch device 3.

[0007] Optionally, the variable distance device 3 comprises a screw rod 301, a gland 302 and a screw sleeve 303. One end of the screw sleeve 303 is fixedly connected with the force sensor, and the other end is threadedly connected with one end of the screw rod 301. The other end of the screw rod 301 is connected with the hexagonal wrench 4 through the lateral plate 5. The gland 302 is sleeved on the screw rod 301 and fixed on the lateral plate 5.

[0008] Optionally, the tension adjusting device comprises a tension screw sleeve. The top surface and the bottom surface of the loading plate 8 are respectively connected to the top plate 1 and the bottom plate through the tension screw sleeve and the force sensor. The length specification of the tension screw sleeve is adjusted according to the size of the calibration component 11 and the double-layer rack.

[0009] Optionally, the lower support rack 6 is provided with a through hole through which the tension screw sleeve passes.

[0010] Optionally, the tension screw sleeve comprises a left screw rod 701, a screw sleeve 702 and a right screw rod 703. The first ends of the left screw rod 701 and the right screw rod 703 are respectively threadedly connected to the two ends of the screw sleeve 702; the left screw rod 701 and the right screw rod 703 are respectively provided with left-handed threads and right-handed threads, and the left end and the right end of the screw sleeve 702 are respectively provided with left-handed internal threads and right-handed internal threads. The second ends of the left screw rod 701 and the right screw rod 703 are connected with the loading plate 8 or the bottom plate; the force sensor is arranged on one side of the loading plate 8 or the bottom plate.

[0011] Optionally, the upper end and the lower end of the calibration component 11 are respectively connected with the loading plate 8 and the lower support rack 6 through the upper adapter flange 9 and the lower adapter flange 12.

[0012] Optionally, the tension screw sleeve is connected with the loading plate 8 or the bottom plate through the double-ear joint 14.

[0013] Optionally, when the calibration component 11 is a stationary ring, the loading plate 8 is cancelled, and the stationary ring is fixedly connected to the lower support rack 6. Each arm of the stationary ring is connected with the tension adjusting device. The loading of the arm bending moment load is realized by adjusting the extension of the tension adjusting device.

[0014] The helicopter mast platform load calibration platform provided by the application is characterized in that: according to the structural characteristics of the helicopter mast platform and the stationary ring and other components, a double-layer rack is designed, the components to be calibrated are installed on the middle support plate, then the axial load, the torque around the shaft and the bending moment of the vertical section are applied to the components through the variable-distance device and the force sensor connected with the loose sleeve, the operation is convenient, the load application is accurate through the monitoring of the force sensor, the mast calibration platform designed by the application has the advantages of reasonable structure, simple layout, convenient disassembly and maintenance, and can calibrate multiple components and multiple load states, accurately apply the torque and the bending moment through the force couple, and the structure is an internal force system, without external load, all calibration work is in the platform, and space can be saved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The structure schematic diagram of the helicopter mast platform load calibration platform provided by the application is provided. Figure 2 The structure schematic diagram of the variable-distance device provided by the application is provided. Figure 3 The application schematic diagram of the cross-section bending moment provided by the application is provided. Figure 4 The structure schematic diagram of the loose sleeve provided by the application is provided. Figure 5 The application schematic diagram of the torque load provided by the application is provided. Figure 6 The structure schematic diagram of the stationary ring support arm load calibration provided by the application is provided. Figure 7 The rotor central transition piece bending moment load calibration schematic diagram provided by the application is provided. BRIEF DESCRIPTION OF DRAWINGS Top plate 1, square column 2, variable-distance device 3, inner hexagonal wrench 4, lateral plate 5, lower support table 6, short loose sleeve 7, loading plate 8, upper adapter flange 9, force sensor 10, calibration component 11, lower adapter flange 12, long loose sleeve 13, double lug joint 14, screw rod 301, gland 302, sleeve 303, left screw rod 701, sleeve 702, right screw rod 703. DETAILED DESCRIPTION

[0016] The helicopter mast platform load calibration platform provided by the application is explained and described below in combination with the drawings.

[0017] The present application provides a kind of helicopter mast platform load calibration platform, design double-layer rack, including top plate, middle support plate, bottom plate, be connected by square column, the component to be calibrated is installed on the middle support plate designed with interface, top plate and bottom plate are provided with joint for loading;Lateral plate is installed on the column, variable pitch device is installed with lateral plate, for exerting torque load;The device is calibrated, without exerting external force, each state is internal force system, and the structure is stable, reliable, can well complete calibration work.

[0018] The technical solutions of the present application are as follows: The helicopter mast calibration rack is composed of a top plate 1, a square column 2, a variable pitch device 3, an internal hexagonal wrench 4, a lateral plate 5, a lower support platform 6, a short elastic bush 7, a loading plate 8, an upper adapter flange 9, a force sensor 10, a calibration component 11, a lower adapter flange 12, a long elastic bush 13, and a double lug joint 14, as shown in Figure 1 .

[0019] When installing the tooling, first place the lower support platform 6 in the appropriate position, then install the square column 2 on the lower support platform 6 in sequence by screwing, install the top plate 1 on the square column 2 by screwing, and install the lateral plate 5 on the side of the square column 2 by screwing. Then, according to the component to be calibrated, select the appropriate lower adapter flange 12 to install on the table surface of the lower support platform 6, install the upper adapter flange 9 on the calibration component 11, and install the loading plate 8 on the upper adapter flange 9.

[0020] Next, according to the required calibration load, determine the direction of the force sensor to be installed, for example, to exert a torque load around the axis of the calibration component 11, as shown in Figure 5 , install the variable pitch device 3 at the corresponding position of the lateral plate 5, connect the sensor 10 to one end of the variable pitch device 3, and connect the internal hexagonal wrench 4 to the other end. The screw rod 301 in the variable pitch device 3 is limited in axial direction by the gland 302, and the threaded end is connected to the bush 303. When the load needs to be applied or released, rotate the internal hexagonal wrench 4 to adjust the length of the variable pitch device, and then apply or release the load, as shown in Figure 2 . Install a set of variable pitch devices 3 on both ends of the loading plate 8 in opposite directions, and then apply the torque load, as shown in Figure 5 .

[0021] If a cross-sectional bending moment is required, as shown in Figure 3 , connect the sensor 10 to the loading plate 8, connect the long elastic bush 13 to the downwardly connected sensor 10, and connect the short elastic bush 7 to the upwardly connected sensor 10.

[0022] As shown in Figure 4As shown, the long elastic nut 7 includes a left screw rod 701, a nut 702, and a right screw rod 703. The left screw rod 701 and the right screw rod 703 are respectively designed with left-handed threads and right-handed threads. The nut 702 is designed with left-handed internal threads and right-handed internal threads. When loading or releasing the load, the nut 702 needs to be rotated. The long elastic nut 7 can realize lengthening and shortening. The working principle of the long elastic nut 13 is consistent with that of the short elastic nut 7.

[0023] As shown in FIG. 6, the short elastic nut 7 is connected with the force sensor 10 at one end and the stationary ring support arm at the other end. Figure 6 As shown in FIG. 6, the short elastic nut 7 is connected with the force sensor 10 at one end and the stationary ring support arm at the other end.

[0024] As shown in FIG. 6, the short elastic nut 7 is connected with the force sensor 10 at one end and the stationary ring support arm at the other end. Figure 7 As shown in FIG. 6, the short elastic nut 7 is connected with the force sensor 10 at one end and the stationary ring support arm at the other end.

Claims

1. A helicopter mast platform load calibration stand, characterized in that, include: Double-layer platform and loading plate (8), tension adjustment device, force sensor; the double-layer platform includes: top plate (1), side plate (5), lower support platform (6), bottom plate and square column (2); The lower support platform (6) is used to fix the calibration component (11), and the loading plate (8) is connected to the top of the calibration component (11); The two opposite corners of the loading plate (8) are connected to two oppositely arranged side plates (5) via a tension adjustment device and a force sensor, respectively; The top and bottom surfaces of the loading plate (8) are connected to the top plate (1) and the bottom plate respectively via a tension adjustment device and a force sensor; The application of torque load and section bending moment load is achieved by adjusting the extension and retraction of the tension adjustment device.

2. The helicopter mast platform load calibration stand according to claim 1, characterized in that, The tension adjustment device includes: a variable pitch device (3); One end of the pitch device (3) is connected to the loading plate (8) through a force sensor, and the other end is fixed on the side plate (5). The adjustment end passes through the side plate (5) and is connected to the internal hex wrench (4). By rotating the internal hex wrench (4), the adjustment end is rotated, thereby adjusting the length of the pitch device (3).

3. The helicopter mast platform load calibration stand according to claim 2, characterized in that, The pitch device (3) includes: a screw (301), a gland (302), and a screw sleeve (303); One end of the screw sleeve (303) is fixedly connected to the force sensor, and the other end is threadedly connected to one end of the screw (301); The other end of the screw (301) passes through the side plate (5) and connects to the Allen wrench (4). The pressure cap (302) is fitted onto the screw (301) and fixed to the side plate (5).

4. The helicopter mast platform load calibration stand according to claim 1, characterized in that, The tension adjustment device includes: a tensioning screw sleeve; The top and bottom surfaces of the loading plate (8) are connected to the top plate (1) and the bottom plate respectively via tightening and loosening screws and force sensors; The length of the tightening threaded sleeve is adjusted according to the dimensions of the calibration component (11) and the double-layer stand.

5. The helicopter mast platform load calibration stand according to claim 4, characterized in that, The lower support platform (6) is provided with a through hole for the tightening and loosening screw sleeve to pass through.

6. The helicopter mast platform load calibration stand according to claim 1, characterized in that, Each tightening and loosening threaded sleeve includes: left threaded rod (701), threaded sleeve (702), and right threaded rod (703); The first ends of the left screw (701) and the right screw (703) are threaded to both ends of the screw sleeve (702); the left screw (701) and the right screw (703) are respectively provided with left-hand thread and right-hand thread, and the left and right ends of the screw sleeve (702) are provided with left-hand internal thread and right-hand internal thread; The second ends of the left screw (701) and the right screw (703) are connected to the loading plate (8) or the base plate; the force sensor is set on one side of the loading plate (8) or the base plate.

7. The helicopter mast platform load calibration stand according to claim 1, characterized in that, The upper and lower ends of the calibration component (11) are connected to the loading plate (8) and the lower support platform (6) through the upper transition flange (9) and the lower transition flange (12), respectively.

8. The helicopter mast platform load calibration stand according to claim 1, characterized in that, The tightening threaded sleeve is connected to the loading plate (8) or the base plate via a double-eared connector (14).

9. The helicopter mast platform load calibration stand according to claim 1, characterized in that, When the calibration component (11) is a stationary ring, the loading plate (8) is removed and the stationary ring is fixedly connected to the lower support platform (6); The arms of the stationary ring are connected to a tension adjustment device; The bending moment load on the outrigger is applied by adjusting the extension and retraction of the tension adjustment device.

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