Helicopter rotor blade static balance measurement and adjustment device and use method thereof

Abstract

The present invention discloses a device for measuring and adjusting the static balance of helicopter rotor blades. The device comprises a T-shaped support base, an electronic balance assembly, and a T-shaped bracket assembly; the T-shaped bracket assembly is mounted on the T-shaped support base; the electronic balance assembly is mounted on the T-shaped support base; the T-shaped support base comprises a transverse support base and a longitudinal support base; the transverse support base is vertically mounted on the upper end of the longitudinal support base; the T-shaped bracket assembly comprises a T-shaped bracket and a positioning rod assembly; the positioning rod assembly is mounted on the T-shaped bracket; the T-shaped bracket comprises a transverse bracket and a longitudinal bracket; the transverse bracket is vertically mounted on the upper end of the longitudinal bracket; the transverse bracket is mounted on the transverse support base, and the longitudinal bracket is mounted on the longitudinal support base. The present invention has the advantage of being able to conveniently measure and adjust the static balance of helicopter rotor blades of different models. The present invention also discloses a method for using the device for measuring and adjusting the static balance of helicopter rotor blades.

Description

Technical Field

[0001] The present invention relates to a device for measuring and adjusting the static balance of a helicopter rotor blade and also relates to a method for using the device. Background Art

[0002] Rotor blades are the main structure for helicopters to obtain lift. During the service life of the rotor, they need to be inspected, maintained and repaired regularly. All operations such as replacement and repair of rotor blade parts may cause the static balance deviation of the rotor blades to exceed the standard, thereby affecting the normal operation of the rotor system, resulting in abnormal rotor blade trajectory, excessive helicopter vibration and other consequences.

[0003] Each helicopter manufacturer has its own unique method and tooling for adjusting rotor blade static balance, primarily using standard rotor blades or weights for lever-type comparative weighing. Each tooling system suffers from limited versatility, large size, heaviness, and cumbersome operation.

[0004] Therefore, it is necessary to develop a helicopter rotor blade static balance measurement and adjustment device with good versatility, light size and simple operation. Summary of the Invention

[0005] The first purpose of the present invention is to provide a helicopter rotor blade static balance measurement and adjustment device with good versatility, compact size, simple operation, and the ability to conveniently measure and adjust the static balance of helicopter rotor blades of different models; the device described in the present invention can not only accurately measure the gravity moment of the rotor blade, but also calculate and evaluate in real time the weight and position of the counterweight blocks that need to be added or reduced on the rotor blade, quantitatively adjust the spanwise and chordwise static balance of the rotor blade, and adjust the gravity moment of the rotor blade to a specified range at one time, and is suitable for helicopter rotor blade static balance measurement and adjustment equipment of various models.

[0006] The second purpose of the present invention is to provide a method for using a helicopter rotor blade static balance measurement and adjustment device.

[0007] In order to achieve the first object of the present invention, the technical solution of the present invention is: a helicopter rotor blade static balance measurement and adjustment device, characterized by comprising a T-shaped support base, an electronic balance assembly, and a T-shaped bracket assembly;

[0008] The T-shaped bracket assembly is installed on the T-shaped support base;

[0009] The electronic balance assembly is mounted on the T-shaped support base and is located between the T-shaped bracket assembly and the T-shaped support base;

[0010] The T-shaped support base includes a transverse support base and a longitudinal support base; the transverse support base is vertically installed on the upper end of the longitudinal support base;

[0011] The T-shaped bracket assembly includes a T-shaped bracket and a positioning rod assembly; the positioning rod assembly is installed on the T-shaped bracket; the T-shaped bracket includes a transverse bracket and a longitudinal bracket; the transverse bracket is vertically installed on the upper end of the longitudinal bracket;

[0012] The transverse bracket is installed on the transverse supporting base, and the longitudinal bracket is installed on the longitudinal supporting base.

[0013] In the above technical solution, the positioning rod assembly includes a span-wise positioning rod assembly, an inner leading edge positioning rod assembly and an outer leading edge positioning rod assembly;

[0014] The spanwise positioning rod assembly and the inner leading edge positioning rod assembly are both located on the longitudinal bracket; the outer leading edge positioning rod assembly is located on the transverse bracket and at the connection between the transverse bracket and the longitudinal bracket; the inner leading edge positioning rod assembly is located between the spanwise positioning rod assembly and the outer leading edge positioning rod assembly.

[0015] In the above technical solution, a screw jack and a marble platform are provided on the T-shaped support base;

[0016] The screw jack is located between the T-shaped support base and the marble platform;

[0017] The electronic balance assembly is located on a marble platform;

[0018] The balance tray pad is installed on the upper end of the electronic balance assembly.

[0019] In the above technical solution, the electronic balance assembly includes at least three electronic balances, namely a first electronic balance, a second electronic balance and a third electronic balance;

[0020] The first electronic balance and the second electronic balance are installed on the transverse support base at intervals and are located between the outer front edge positioning rod assembly and the transverse support base;

[0021] The third electronic balance is installed on the longitudinal support base and is located between the inner front edge positioning rod assembly and the longitudinal support base;

[0022] The balance tray pad is installed on the upper end of the electronic balance.

[0023] In the above technical solution, both ends of the transverse bracket are respectively mounted on the balance tray pads of the first electronic balance and the second electronic balance through support screw assemblies;

[0024] The longitudinal bracket is mounted on the balance tray pad of the third electronic balance through a support screw assembly;

[0025] The helicopter rotor blades are located on the spanwise locating rod assembly, the inner leading edge locating rod assembly and the outer leading edge locating rod assembly.

[0026] In the above technical solution, the spanwise positioning rod assembly includes a plurality of spanwise positioning rods; the plurality of spanwise positioning rods are arranged on the longitudinal bracket at intervals;

[0027] The inner leading edge positioning rod assembly and the outer leading edge positioning rod assembly are both fixed to the T-shaped support base by bolts, and the inner leading edge positioning rod assembly and the outer leading edge positioning rod assembly are connected and fixed to each other by bolts.

[0028] In the above technical solution, the structures of the outer leading edge positioning rod assembly and the inner leading edge positioning rod assembly are similar; the outer leading edge positioning rod assembly and the inner leading edge positioning rod assembly each include a support screw base, a support screw, a base plate, a translation stage assembly, a positioning pin hole seat, a T-shaped frame support foot and a positioning pin;

[0029] The support screw is installed on the support screw base;

[0030] The support screw base, translation stage assembly, and T-shaped frame support legs are all mounted on the base plate;

[0031] The support screw base and the translation stage assembly are spaced apart;

[0032] The positioning pins include an inner positioning pin and an outer positioning pin;

[0033] The positioning pin hole seat is installed on the bottom plate; the lower end of the inner positioning pin is located in the positioning pin hole seat, and the upper end is in contact with the translation stage assembly; the outer positioning pin is installed on the T-shaped frame support foot;

[0034] The T-shaped support legs are located between the stage assembly and the base plate;

[0035] The micrometer screw is installed on the side end of the T-shaped frame support leg.

[0036] In the above technical solution, the base plate in the outer leading edge positioning rod assembly is a hollow flat plate structure; one end of the base plate in the outer leading edge positioning rod assembly is installed on the horizontal bracket through the support screw base and the support screw, and the other end is installed on the longitudinal bracket through the inner positioning pin.

[0037] In the above technical solution, the base plate in the inner leading edge positioning rod assembly is a hollow bent structure; one end of the base plate in the inner leading edge positioning rod assembly is fixed to the longitudinal bracket through a connecting bracket, and the other end is installed on the longitudinal bracket through an inner positioning pin.

[0038] In order to achieve the second purpose of the present invention, the technical solution of the present invention is: a method for using the helicopter rotor blade static balance measurement and adjustment device, characterized in that it includes the following steps:

[0039] Step 1: First check the stability of the T-shaped support base, then check whether the single marble platform is level and whether the planes of the three marble platforms are on the same plane. If necessary, use the screw jack to adjust the marble platform to meet the requirements (if the plane of the marble platform does not meet the requirements, use the screw jack to adjust it to meet the requirements); Place the electronic balance on the marble platform and adjust it to a horizontal state. Place the balance tray pad in the middle of the electronic balance tray; Place the T-shaped bracket assembly on the T-shaped support base, so that the three support legs of the T-shaped bracket fall on the three balance tray pads respectively;

[0040] Step 2: Set the inner leading edge positioning rod assembly. Select the predetermined gear position on the support screw base according to the rotor blade model and install the two support screws. Install the translation stage assembly onto the base plate assembly.

[0041] Install the caliper assembly onto the base plate of the inner leading edge positioning rod assembly (i.e., the translation stage assembly), and slide the caliper assembly's cursor to zero. Insert the inner positioning pin of the positioning pin into the center positioning pin hole seat, slide the caliper assembly's cursor against the inner positioning pin, and simultaneously return the caliper assembly to zero. Select the gear position on the translation stage assembly according to the rotor blade model, transfer the positioning pin to the translation stage, slide the caliper assembly's cursor, fine-tune the translation stage assembly, adjust the positioning pin to the required position, return the micrometer screw on the translation stage to zero, and remove the caliper assembly.

[0042] Install the caliper assembly onto the translation stage assembly of the outer leading edge positioning rod assembly and repeat the above steps until the micrometer screw on the translation stage assembly of the outer leading edge positioning rod assembly returns to zero.

[0043] Step 3: Return all three electronic balances to zero; place the rotor blade on the T-frame assembly so that the rotor blade's mounting pin fixture is close to, but not touching, the inner and outer locating pins of the outer and inner leading edge locating rod assemblies; use the caliper assembly to measure the distance between the mounting pin fixture and the spanwise locating rod, rotate the micrometer screw, measure the length of the gap between the outer locating pin and the leading edge of the rotor blade, and record it; then return the micrometer screw to zero and record the readings of the first, second, and third electronic balances;

[0044] Step 4: By comparing the readings of the first electronic balance, the second electronic balance and the third electronic balance with the change in the gap length of the leading edge of the rotor blade measured by the micrometer screw, the spanwise and chordwise static balance changes of the rotor blade are obtained, so as to make targeted weight adjustments.

[0045] The beneficial effects of the present invention are:

[0046] By using spanwise and chordwise locating rods to determine the overall coordinate values ​​of the rotor blades, the high versatility ensures that the equipment is applicable to all models (different structures, widths, and types) of helicopter rotor blades within a certain size range; at the same time, through the readings of three electronic balances, the spanwise and chordwise static balance of the rotor blades can be adjusted simultaneously and precisely, which greatly improves the adjustment efficiency and the accuracy of the adjustment results compared to general lever-type special static balancing machines.

[0047] The static balance measurement and adjustment equipment for helicopter rotor blades described in the present invention can be applied to various types of rotor blades, effectively measure the center of gravity position and relative torque value of the rotor blades, and calculate the counterweight weight that needs to be added for each specific model of rotor to ensure that the static balance of the rotor blades can be accurately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the overall structure of the rotor blade static balance measurement and adjustment device of the present invention.

[0049] Figure 2 It is a structural schematic diagram of the T-shaped support base in the present invention.

[0050] Figure 3 Schematic diagram of the structure of the T-shaped bracket in the present invention.

[0051] Figure 4 This is a structural schematic diagram of the outer leading edge positioning rod assembly in the present invention installed on the T-shaped bracket assembly.

[0052] Figure 5 This is a structural schematic diagram of the inner leading edge positioning rod assembly of the present invention installed on the T-shaped bracket assembly.

[0053] In the figure, AT-shaped supporting base, B-electronic balance assembly, C-rotor blade, DT-shaped bracket assembly, 1-support screw assembly, 2-screw jack, 3-marble platform, 4-electronic balance, 41-first electronic balance, 42-first electronic balance, 43-first electronic balance, 5-balance tray pad, D1-spanwise positioning rod assembly, D2-inner leading edge positioning rod assembly, D3-outer leading edge positioning rod assembly, 6-spanwise positioning rod, 7-support screw assembly, 8-caliper assembly, 9-center positioning pin hole seat, 10-translation stage assembly, 11-locating pin, 12-locating pin seat, 13-locating pin, 131-inner positioning pin, 132-outer positioning pin, 14-screw micrometer, 15-connecting bracket. DETAILED DESCRIPTION

[0054] The following detailed description of the embodiments of the present invention is given in conjunction with the accompanying drawings, which do not limit the present invention but are merely examples. The description makes the advantages of the present invention clearer and easier to understand.

[0055] The present invention uses a T-shaped support base as a base, and places three marble platforms on the T-shaped support base to provide a stable support surface for three electronic balances. Screw jacks are set at the four corners of each marble platform to adjust the height of the marble platform surface to ensure that the marble platform surface is horizontal and at the same height; four support screws are provided on the T-shaped bracket to support the rotor blades. For each model of rotor blades, the rotor blades can be adjusted to a specific "horizontal" state by setting the position and height of the screws; there are three supporting feet at the bottom of the T-shaped bracket assembly, which fall on three balance tray pads respectively. The T-shaped bracket can be adjusted to a horizontal state by adjusting the height of the T-shaped bracket support feet; the T-shaped bracket exists as a two-dimensional coordinate system, the direction of the line connecting the two supporting feet with a shorter distance is defined as the Y-axis, and the direction of the line connecting the two supporting feet with a longer distance is defined as the X-axis, so that an XY coordinate system is obtained. The T-shaped bracket is provided with multiple spanwise positioning rods in the X-axis direction. For rotor blades of different lengths, the appropriate gear can be selected, and the distance between the pin rod passing through the rotor blade mounting hole (defined here as the zero position of the rotor blade) and the positioning rod can be measured to perform spanwise positioning of the rotor blade (obtain the X-axis coordinate of the rotor blade); there are two rotor blade leading edge positioning rod assemblies on the T-shaped bracket, which contain a ranging module that can locate the chordwise positioning of the leading edge of the rotor blade (obtain the Y-axis coordinate of the rotor blade); in the T-shaped bracket coordinate system, the readings of three electronic balances can be used to calculate the chordwise and spanwise gravitational moments of the rotor blade, and the weight and position of the chordwise and spanwise counterweights that need to be added or reduced can be evaluated, thereby completing the spanwise and chordwise static balance adjustment of the rotor blade in one step.

[0056] Referring to the accompanying drawings, it can be seen that: a helicopter rotor blade static balance measurement and adjustment device includes a T-shaped support base A, an electronic balance assembly B, and a T-shaped bracket assembly D;

[0057] The T-shaped bracket assembly D is installed on the T-shaped support base A;

[0058] The electronic balance assembly B is installed on the T-shaped support base A and is located between the T-shaped bracket assembly D and the T-shaped support base A;

[0059] The T-shaped support base A includes a transverse support base A1 and a longitudinal support base A2; the transverse support base A1 is vertically mounted on the upper end of the longitudinal support base A2;

[0060] The T-shaped bracket assembly D includes a T-shaped bracket E and a positioning rod assembly; the positioning rod assembly is installed on the T-shaped bracket; the T-shaped bracket includes a transverse bracket E1 and a longitudinal bracket E2; the transverse bracket E1 is vertically installed on the upper end of the longitudinal bracket E2;

[0061] The transverse bracket E1 is installed on the transverse support base A1, and the longitudinal bracket E2 is installed on the longitudinal support base A2; the present invention uses a spanwise positioning rod (i.e., a T-shaped bracket assembly D) to locate the spanwise position of the blade. According to the length and root structure of different types of blades, spanwise positioning rods in different positions are adapted to ensure that each type of blade can be accurately positioned in the spanwise direction on this equipment.

[0062] Furthermore, the positioning rod assembly includes a span-wise positioning rod assembly D1, an inner leading edge positioning rod assembly D2, and an outer leading edge positioning rod assembly D3;

[0063] The spanwise positioning rod assembly D1 and the inner leading edge positioning rod assembly D2 are both located on the longitudinal bracket. The present invention uses two leading edge positioning rod assemblies (i.e., the spanwise positioning rod assembly D1 and the inner leading edge positioning rod assembly D2) to locate the leading edge (chordwise) position of the rotor. The assembly itself has a precise distance measurement function and, in conjunction with a caliper, can effectively ensure the measurement accuracy of the leading edge (chordwise) position of the blade. The outer leading edge positioning rod assembly D3 is located on the transverse bracket and at the connection between the transverse bracket and the longitudinal bracket. The inner leading edge positioning rod assembly D2 is located between the spanwise positioning rod assembly D1 and the outer leading edge positioning rod assembly D3. The present invention supports the rotor blades by a support screw assembly on a T-shaped bracket. The spanwise positioning rod and the two leading edge (chordwise) positioning rod assemblies locate the blade position with a positioning accuracy of 0.01mm.

[0064] Furthermore, a screw jack 2 and a marble platform 3 are provided on the T-shaped support base A;

[0065] The screw jack 2 is located between the T-shaped support base A and the marble platform 3;

[0066] The electronic balance assembly B is located on the marble platform 3;

[0067] The balance tray pad 5 is installed on the upper end of the electronic balance component B.

[0068] Furthermore, the electronic balance assembly B includes at least three electronic balances 4, namely a first electronic balance 41, a second electronic balance 42, and a third electronic balance 43. The present invention uses three electronic balances to perform three-point weighing on the rotor blade, and the accuracy of the electronic balance is 0.1g. At the same time, a specific formula is used to calculate the position and weight of the counterweight to be added, which can calculate the weight and position of the counterweight to be added at one time, and adjust the spanwise and chordwise static balance of the blade at the same time. The calculation method is:

[0069] The following data can be obtained by following the operation method:

[0070] Weight readings of electronic balances GL, GT1, GT2

[0071] Screw micrometer readings Lml, Lmt

[0072] Caliper reading Lc

[0073] The distances Ltl and Ltt from the positioning pin 13 to the center of the T-shaped frame

[0074] Distance between blade support points M

[0075] Initial measurement: record Lc 初始

[0076] F 初始1 =(M*GL),F 初始2 =M*(GT1+GT2)

[0077] F 初始3 =(Ltl-Lml)*GL,F 初始4 =(Ltt-Lmt)*GT2

[0078] Measurement after repair: Adjust the rotor blade placement so that the Lc value is equal to the recorded Lc 初始 , and then measure

[0079] F 调整1 =(M*GL),F 调整2 =M*(GT1+GT2)

[0080] F 调整3 =(Ltl-Lml)*GL,F 调整4 =(Ltt-Lmt)*GT2

[0081] Weight to be adjusted G 调节 =(F 初始 -F 调整 ) / Lml(or Lmt), where (F 初始 -F 调整 ) is a positive value, indicating that the weight needs to be increased; a negative value indicates that the weight needs to be decreased.

[0082] After obtaining the weight value that needs to be adjusted, install or remove the corresponding weight at the position specified in the maintenance document of the rotor blade according to the weight adjustment requirements, and then weigh again until (F 初始 -F 调整 ) is less than 10g.m to meet the balancing design requirements.

[0083] The * above represents the mathematical symbol multiplication sign.

[0084] The first electronic balance 41 and the second electronic balance 42 are installed on the transverse support base at intervals and are located between the outer front edge positioning rod assembly D3 and the transverse support base;

[0085] The third electronic balance 43 is installed on the longitudinal support base and is located between the inner front edge positioning rod assembly D2 and the longitudinal support base;

[0086] The balance tray pad 5 is installed in the middle of the upper end of the electronic balance 4.

[0087] Furthermore, both ends of the transverse bracket E1 are respectively mounted on the balance tray pads 5 of the first electronic balance 41 and the second electronic balance 42 through the support screw assembly 1;

[0088] The longitudinal bracket E2 is mounted on the balance tray pad 5 of the third electronic balance 43 via the support screw assembly 1;

[0089] The helicopter rotor blades are located on the spanwise positioning rod assembly D1, the inner leading edge positioning rod assembly D2 and the outer leading edge positioning rod assembly D3.

[0090] The present invention supports the rotor blades by a support screw assembly on a T-shaped frame. Support screws at different positions and heights are adapted according to the shapes and widths of different types of blades, ensuring that blades of each type can be placed in the same horizontal posture on this device.

[0091] Furthermore, the spanwise positioning rod assembly D1 includes a plurality of spanwise positioning rods 6; the plurality of spanwise positioning rods 6 are spaced apart and arranged on the longitudinal bracket E2;

[0092] The inner leading edge positioning rod assembly D2 and the outer leading edge positioning rod assembly D3 are both fixed to the T-shaped support base A with bolts. The inner leading edge positioning rod assembly D2 and the outer leading edge positioning rod assembly D3 are connected and fixed to each other with bolts. The installation position is as follows: Figure 3 shown.

[0093] Furthermore, the outer front edge positioning rod assembly D3 and the inner front edge positioning rod assembly D2 each include a support screw base 7, a support screw 8, a base plate 9, a translation stage assembly 10, a positioning pin hole seat 11, a T-shaped frame support foot 12 and a positioning pin 13;

[0094] The support screw 8 is mounted on the support screw base 7;

[0095] The support screw base 7, the translation stage assembly 10, and the T-shaped frame support legs 12 are all mounted on the base plate 9;

[0096] The support screw base 7 and the translation stage assembly 10 are spaced apart;

[0097] The positioning pin 13 includes an inner positioning pin 131 and an outer positioning pin 132;

[0098] The positioning pin hole seat 11 is installed on the base plate 9; the lower end of the inner positioning pin 131 is located in the positioning pin hole seat 11, and the upper end is in contact with the translation stage assembly 10; the outer positioning pin 132 is installed on the T-shaped frame support leg 12;

[0099] The T-shaped support leg 12 is located between the translation stage assembly 10 and the base plate 9;

[0100] The micrometer screw 14 is mounted on the side end of the T-shaped frame support leg 12.

[0101] Furthermore, the base plate 9 in the outer leading edge positioning rod assembly D3 is a hollow flat plate structure; one end of the base plate 9 in the outer leading edge positioning rod assembly D3 is installed on the transverse bracket E1 through the support screw base 7 and the support screw 8, and the other end is installed on the longitudinal bracket E2 through the inner positioning pin 131.

[0102] Furthermore, the base plate 9 in the inner front edge positioning rod assembly D2 has a hollow bent structure; one end of the base plate 9 in the inner front edge positioning rod assembly D2 is fixed to the longitudinal bracket E2 through the connecting bracket 15, and the other end is installed on the longitudinal bracket E2 through the inner positioning pin 131.

[0103] Referring to the accompanying drawings, it can be seen that the method for using the helicopter rotor blade static balance measurement and adjustment device includes the following steps:

[0104] According to the static balance requirements of helicopter rotor blades, the static balance of the rotor blades needs to be checked and adjusted after repairing or replacing parts of the blades.

[0105] Step 1: First, check the stability of the T-shaped support base A. Then, check whether the single marble platform 3 is level and whether the planes of the three marble platforms 3 are aligned. Adjust the marble platform 3 as needed using the screw jack 2 to ensure that the plane meets the requirements. Place the electronic balance 4 on the marble platform 3 and adjust it to a horizontal position. Place the balance tray pad 5 in the middle of the electronic balance 4 tray. Place the T-shaped bracket assembly D on the T-shaped support base A, so that the three support screw assemblies 1 of the T-shaped bracket rest on the three balance tray pads 5.

[0106] Step 2: Set the inner leading edge positioning rod assembly D2. According to the model of the rotor blade C, select the predetermined gear on the support screw base 7 and install the two support screws 8.

[0107] Install the translation stage assembly 12 onto the base plate assembly 9; install the caliper assembly 10 onto the base plate 9, and slide the cursor of the caliper assembly 10 to zero; insert the locating pin 13 into the center locating pin hole 11, slide the cursor of the caliper assembly 10 against the locating pin, and return the caliper assembly 10 to zero at the same time; select the gear position on the translation stage assembly 12 according to the rotor blade model, transfer the locating pin 13 to the translation stage, slide the cursor of the caliper assembly 10, fine-tune the translation stage, adjust the locating pin 13 to the required position, return the micrometer screw reading of the positioning stage assembly 12 where the locating pin 13 is located to zero, and remove the caliper assembly 10;

[0108] Install the caliper assembly 10 onto the outer leading edge positioning rod assembly D3 and repeat the above steps;

[0109] Step 3: Return all three electronic balances 4 to zero; place the rotor blade (with the mounting pin fixture) on the T-frame assembly D, so that the mounting pin fixture is close to but not touching the spanwise locating rod 6, and so that the leading edge of the rotor blade is close to but not touching the inner and outer locating pins; use a caliper to measure the distance between the mounting pin fixture and the spanwise locating rod, rotate the micrometer screw, measure the length of the gap between the locating pin and the leading edge of the blade and record it, then rotate the micrometer screw back to zero and record the readings of the three electronic balances;

[0110] Step 4: By comparing the electronic balance readings with the length changes measured by the micrometer screw and caliper, the spanwise and chordwise static balance changes of the rotor blades can be determined, allowing for targeted weight adjustments.

[0111] Existing rotor blade static balance checks often use two-point or single-point weighing methods. These methods can only obtain a single value, the spanwise gravity moment of the rotor blade, and often lack matching dedicated positioning tooling during measurement, making it difficult to guarantee the accuracy and stability of the measurement results. The present invention uses a three-point weighing method, which can obtain both the spanwise and chordwise gravity moments of the rotor blades. Furthermore, a positioning device is used in conjunction with the method, making the weighing results of the same batch of rotor blades more accurate and stable. Accurate static balance data can greatly shorten the time required for static balance adjustment of the rotor blades. Blades that have been statically balanced by this method have a one-time pass rate of over 85% for dynamic balancing after installation.

[0112] Currently, the mainstream helicopter rotor blades in China (single blade length) are 4m to 16m. The existing technology is only applicable to helicopter rotor blades with a length of less than 3m due to its point or single-point weighing structure; while the present invention is applicable to helicopter rotor blades with a length of 4m to 16m due to its three-point weighing structure.

[0113] Other parts not described belong to the prior art.

Claims

1. A helicopter rotor blade static balance measurement and adjustment device, characterized by: It includes a T-shaped support base (A), an electronic balance assembly (B), and a T-shaped bracket assembly (D); The T-shaped bracket assembly (D) is installed on the T-shaped support base (A); The electronic balance assembly (B) is mounted on the T-shaped support base (A) and is located between the T-shaped bracket assembly (D) and the T-shaped support base (A); The T-shaped support base (A) includes a transverse support base (A1) and a longitudinal support base (A2); the transverse support base (A1) is vertically mounted on the upper end of the longitudinal support base (A2); The T-shaped bracket assembly (D) includes a T-shaped bracket (E) and a positioning rod assembly; the positioning rod assembly is installed on the T-shaped bracket; the T-shaped bracket (E) includes a transverse bracket (E1) and a longitudinal bracket (E2); the transverse bracket (E1) is vertically installed on the upper end of the longitudinal bracket (E2); The transverse bracket (E1) is installed on the transverse supporting base (A1), and the longitudinal bracket (E2) is installed on the longitudinal supporting base (A2); The positioning rod assembly includes a span-wise positioning rod assembly (D1), an inner leading edge positioning rod assembly (D2) and an outer leading edge positioning rod assembly (D3); The spanwise positioning rod assembly (D1) and the inner leading edge positioning rod assembly (D2) are both located on the longitudinal bracket (E2); the outer leading edge positioning rod assembly (D3) is located on the transverse bracket and at the connection between the transverse bracket and the longitudinal bracket; the inner leading edge positioning rod assembly (D2) is located between the spanwise positioning rod assembly (D1) and the outer leading edge positioning rod assembly (D3); A screw jack (2) and a marble platform (3) are provided on the T-shaped supporting base (A); The screw jack (2) is located between the T-shaped support base A and the marble platform (3); The electronic balance assembly (B) is located on the marble platform (3); The balance tray pad (5) is installed on the upper end of the electronic balance assembly (B); The electronic balance assembly (B) comprises at least three electronic balances (4), namely a first electronic balance (41), a second electronic balance (42) and a third electronic balance (43); The first electronic balance (41) and the second electronic balance (42) are installed on the transverse support base at intervals and are located between the outer front edge positioning rod assembly (D3) and the transverse support base; The third electronic balance (43) is installed on the longitudinal support base and is located between the inner front edge positioning rod assembly (D2) and the longitudinal support base; The balance tray pad (5) is installed on the upper end of the electronic balance (4); Both ends of the transverse bracket (E1) are respectively mounted on the balance tray pads (5) of the first electronic balance (41) and the second electronic balance (42) through support screw assemblies (1); The longitudinal bracket (E2) is mounted on the balance tray pad (5) of the third electronic balance (43) via a support screw assembly (1); The helicopter rotor blades are located on a spanwise positioning rod assembly (D1), an inner leading edge positioning rod assembly (D2) and an outer leading edge positioning rod assembly (D3); The spanwise positioning rod assembly (D1) comprises a plurality of spanwise positioning rods (6); the plurality of spanwise positioning rods (6) are arranged at intervals on the longitudinal bracket (E2); The outer front edge positioning rod assembly (D3) and the inner front edge positioning rod assembly (D2) each include a support screw base (7), a support screw (8), a base plate (9), a displacement platform assembly (10), a positioning pin hole seat (11), a T-shaped frame support foot (12) and a positioning pin (13); The support screw (8) is mounted on the support screw base (7); The support screw base (7), the displacement stage assembly (10), and the T-shaped frame support foot (12) are all mounted on the bottom plate (9); The support screw base (7) and the translation stage assembly (10) are spaced apart; The positioning pin (13) includes an inner positioning pin (131) and an outer positioning pin (132); The positioning pin hole seat (11) is installed on the bottom plate (9); the lower end of the inner positioning pin (131) is located inside the positioning pin hole seat (11) and the upper end is in contact with the displacement stage assembly (10); the outer positioning pin (132) is installed on the T-shaped frame support foot (12); The T-shaped support leg (12) is located between the translation stage assembly (10) and the base plate (9); The micrometer screw head (14) is installed on the side end of the T-shaped frame support leg (12).

2. The helicopter rotor blade static balance measurement and adjustment device according to claim 1, characterized in that: The bottom plate (9) in the outer front edge positioning rod assembly (D3) is a hollow flat plate structure; one end of the bottom plate (9) in the outer front edge positioning rod assembly (D3) is mounted on the transverse bracket (E1) through a support screw base (7) and a support screw (8), and the other end is mounted on the longitudinal bracket (E2) through an inner positioning pin (131).

3. The helicopter rotor blade static balance measurement and adjustment device according to claim 2, characterized in that: The bottom plate (9) in the inner front edge positioning rod assembly (D2) is a hollow bent structure; one end of the bottom plate (9) in the inner front edge positioning rod assembly (D2) is fixed to the longitudinal bracket (E2) through a connecting bracket (15), and the other end is installed on the longitudinal bracket (E2) through an inner positioning pin (131).

4. The method for using the helicopter rotor blade static balance measurement and adjustment device according to claim 3, characterized in that: The following steps are included: Step 1: First check the stability of the T-shaped support base (A), and then check whether the plane of the marble platform (3) meets the requirements that a single marble platform (3) is horizontal and the planes of the three marble platforms (3) are on the same plane; when the plane of the marble platform (3) does not meet the requirements, adjust it by using the screw jack (2) to make the plane of the marble platform (3) meet the requirements; when the plane of the marble platform (3) meets the requirements, place the electronic balance (4) on the marble platform (3) and adjust it to a horizontal state; place the balance tray pad (5) in the middle position of the tray of the electronic balance (4); place the T-shaped bracket assembly (D) on the T-shaped support base (A), so that the three support screw assemblies (1) of the T-shaped bracket (E) of the T-shaped bracket assembly (D) fall on the three balance tray pads (5) respectively; Step 2: Set the inner leading edge positioning rod assembly (D2), select a predetermined gear on the support screw base (7) according to the model of the rotor blade, and install two support screws (8); install the translation stage assembly (10) on the base plate (9); Install the caliper assembly onto the translation stage assembly (10) of the inner leading edge positioning rod assembly (D2), and slide the cursor of the caliper assembly to zero; insert the inner positioning pin (131) of the positioning pin (13) into the center positioning pin hole seat (11), slide the cursor of the caliper assembly to press against the inner positioning pin (131), and at the same time return the caliper assembly to zero; select the gear position on the translation stage assembly (10) according to the rotor blade model, change the positioning pin (13) to the translation stage, slide the cursor of the caliper assembly, fine-tune the translation stage assembly, adjust the inner positioning pin (131) of the positioning pin (13) to the required position, return the reading of the micrometer screw (14) on the translation stage assembly (10) to zero, and remove the caliper assembly; Install the caliper assembly onto the translation stage assembly (10) of the outer front edge positioning rod assembly (D3), and repeat the above operation until the micrometer screw (14) on the translation stage assembly (10) of the outer front edge positioning rod assembly (D3) returns to zero; Step 3: Return all readings of the three electronic balances (4) to zero; place the rotor blade on the T-shaped bracket assembly (D), so that the installation pin fixture of the rotor blade is close to but not in contact with the spanwise positioning rod (6), and the leading edge of the rotor blade is close to but not in contact with the inner positioning pin (131) and the outer positioning pin (132) of the outer leading edge positioning rod assembly (D3) and the inner leading edge positioning rod assembly (D2); use a caliper assembly to measure the distance between the installation pin fixture and the spanwise positioning rod, rotate the micrometer screw (14), measure the length of the gap between the outer positioning pin (132) and the leading edge of the rotor blade and record it, then rotate the micrometer screw (14) back to zero, and record the readings of the first electronic balance (41), the second electronic balance (42), and the third electronic balance (43); Step 4: By comparing the readings of the first electronic balance (41), the second electronic balance (42) and the third electronic balance (43) with the change in the gap length of the leading edge of the rotor blade measured by the screw micrometer (14), the spanwise and chordwise static balance changes of the rotor blade are obtained, thereby performing targeted weight adjustment.

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