An auxiliary device and an adjustment method for helicopter rotor adjustment

Abstract

The present invention relates to an auxiliary device for helicopter rotor correction, and specifically discloses an auxiliary device and an adjustment method for helicopter rotor adjustment, including an upper clamping part and a lower clamping part, which are oppositely arranged to form a long clamping gap; a groove is formed on one gap surface of the long clamping gap, and a plurality of rubber bags A are laid flat in the groove and covered with a flexible layer; a rubber bladder B is placed in the rubber bag A, and the rubber bladder B is connected to an input pipeline and an output pipeline, and the input pipeline and the output pipeline pass through the rubber bag A; a closed cavity is formed between the rubber bag A and the rubber bladder B, and a liquid metal is contained in the cavity; each rubber bladder B is respectively connected to a high-pressure hot gas source and a high-pressure cold gas source through corresponding pipelines and pumps, and only one of the high-pressure hot gas source and the high-pressure cold gas source can be connected to the rubber bladder B during operation. The beneficial effects achieved by the present invention are: under the condition of simple correction operation, the correction accuracy is higher; the correction effect is better, and it is not easy to rebound after correction.

Description

Technical Field

[0001] The invention relates to the technical field of helicopter rotor correction, in particular to an auxiliary device and a regulating method for helicopter rotor regulation. Background Art

[0002] like Figure 1 As shown in the figure, the rotor (blade) of a helicopter is an important component that can generate lift and thrust. The shape of the rotor can directly affect the flight ability of the helicopter, so the shape of the rotor is very important. However, during long-term flight, the rotor will deform, resulting in inconsistent torsion angles at different positions, so the torsion angle needs to be corrected.

[0003] There are many ways to measure and correct the torsion angle. The most common torsion angle measurement methods include binocular stereo vision technology, digital speckle correlation method, and perspective transformation method.

[0004] Of course, there are also very simple measurement methods and simple correction methods. Simple torsion angle error measurement methods, for example: a. Use Figure 2 The measuring tool shown in the figure is to fit the long handle of the measuring tool (the side with the small protrusion) to the surface of the reference strip plate, and to fit the curved part of the measuring tool to the Figure 1 The rotor has a certain arc edge contact, and the angle data is read by measuring the scale at the curved part of the tool; b. Then slide the measuring tool along the length of the rotor and read the angle data step by step; c. By measuring the angle difference between two positions, the torsion angle change is obtained. A simple correction method is to use a simple clamping mechanism to straighten the rotor.

[0005] Whether it is a simple measurement method, a simple correction method, or a conventional torsion angle measurement method, a conventional torsion angle correction method, they all have their inevitability. The former is simple and fast to calibrate, but not accurate enough, while the latter takes a long time to calibrate, but is more accurate. In actual work, in some special cases where time is tight and the workload is large, simple measurement and simple correction are also very practical choices.

[0006] However, in the current simple correction method, the correction tool used is just a simple tool with a clamping gap. When working, the rotor is inserted into the gap of the correction structure, and then the correction tool is bent to deform the rotor. This manual correction method has too low controllability and over-correction often occurs. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an auxiliary device and an adjustment method for helicopter rotor adjustment, which solves the problems of uncontrollable calibration, poor calibration accuracy and possible rebound of the rotor after correction in the existing simple correction tools when correcting the rotor.

[0008] The object of the present invention is achieved by the following technical solutions:

[0009] In a first aspect, an auxiliary device for helicopter rotor adjustment includes an upper clamping part and a lower clamping part, and a long clamping gap is formed after the two are arranged oppositely;

[0010] A groove is formed on one gap surface of the long clamping gap. After a plurality of rubber bags A are laid flat in the groove, they are covered with a flexible layer. The flexible layer is provided with a plurality of pressure sensors at intervals along the length direction of the long clamping gap;

[0011] A rubber bladder B is placed in the rubber bag A. The rubber bladder B is connected to an input pipeline and an output pipeline, and the input pipeline and the output pipeline pass through the rubber bag A;

[0012] A closed cavity is formed between the rubber bag A and the rubber bladder B, and liquid metal is contained in the cavity; each rubber bladder B is respectively connected to a high-pressure hot gas source and a high-pressure cold gas source through corresponding pipelines and pumps, and only one of the high-pressure hot gas source and the high-pressure cold gas source can be connected to the rubber bladder B during operation;

[0013] During calibration adjustment: place the deformed rotor in the long clamping gap; inject hot gas into the rubber bag B through the high-pressure hot gas source, so that the rubber bag A and the flexible layer are deformed, and the hot gas makes the liquid metal in a molten state; then switch to the high-pressure cold gas source. In the initial stage, the cold gas can also deform the rubber bag A and the flexible layer, and the subsequent cold gas can solidify the liquid metal, so that the rotor is rigidly clamped, and the calibration of the rotor is achieved after maintaining for a period of time.

[0014] In an advantageous embodiment, in the connection of the rubber bladder B to the high-pressure hot gas source and the high-pressure cold gas source through corresponding pipelines and pumps respectively:

[0015] When the rubber bladder B is connected to the high-pressure hot gas source, it means that a pressure gauge and a corresponding switch valve are provided on the intake pipe of the rubber bladder B, and a corresponding switch valve is also provided on the outlet pipe of the rubber bladder B; the intake pipe is sequentially connected to a three-way valve, a heating device, and a nitrogen cylinder A with adjustable output pressure;

[0016] When the rubber bladder B is connected to the high-pressure cold gas source, it means that after the intake pipe is connected to the three-way valve, the three-way valve is also sequentially connected to a cooling device and a nitrogen cylinder B with adjustable output pressure through a shunt pipeline.

[0017] In an advantageous embodiment, the upper clamping part includes an upper clamping plate. A groove is formed on the lower surface of the upper clamping plate, and a plurality of rubber bands A are placed in the groove in an array. A flexible layer is fixedly covered on the lower surface of the upper clamping plate; the lower clamping part includes a lower clamping plate, no groove is formed on the lower clamping plate, and a corresponding flexible layer is fixedly covered on the upper surface of the lower clamping plate; the upper clamping plate and the lower clamping plate are arranged oppositely, and a strip-shaped plate is clamped at their rear edges, and the three are fixed into a whole by bolts; after forming the whole shape, a long clamping gap is formed in the front part of the upper clamping plate and the lower clamping plate.

[0018] In an advantageous embodiment, corresponding back plates are provided on the back surfaces of the upper clamping plate and the lower clamping plate. After a handle with a U-shaped groove head clamps the upper clamping plate, the lower clamping plate, the strip-shaped plate, and the corresponding two back plates together, they are fixed by bolts.

[0019] In an advantageous embodiment, the front edges of the upper clamping plate and the lower clamping plate are respectively warped towards the back surface, so that the long clamping gap is flared at the front edge.

[0020] In an advantageous embodiment, holes for leading out the input pipeline and the output pipeline of the rubber bladder B are formed in the groove of the upper clamping plate.

[0021] In a second aspect, an adjustment method for helicopter rotor adjustment is implemented by using the above auxiliary device, and specifically includes the following steps:

[0022] S1. Calibration;

[0023] Connect the rubber bladder B to a high-pressure hot gas source, open the on-off valves on the input pipe and the output pipe, and melt the liquid metal through the hot gas in the high-pressure hot gas source;

[0024] After a period of time, place calibration strip plates with different thicknesses at the long clamping gap, and then close the on-off valve on the output pipe; then inject hot gas into the rubber bladder B, causing the rubber bladder B, the rubber bands A, and the flexible layer to bulge and deform. Measure the relationship between the deformation amount of the flexible layer bulging in the thickness direction of the long clamping gap and the pressure of the hot gas provided in the high-pressure hot gas source, and record it;

[0025] S2. Measurement;

[0026] Measure the length of a single rotor of the helicopter with a length measuring tool, and then divide the length of the rotor into multiple equal-length units; then use a twist angle measuring unit to measure the deformation difference of the twist angles at both ends of the equal-length units;

[0027] S3. Thermal correction;

[0028] Clamp the long clamping gap of the auxiliary device on a single rotor of the helicopter, and support the auxiliary device on the ground through a bracket;

[0029] Connect the rubber bladder B to a high-pressure hot gas source, open the switching valves on the input pipe and the output pipe, and melt the liquid metal by the hot gas in the high-pressure hot gas source;

[0030] After a period of time, close the switching valve on the output pipe; inject pressurized hot gas into the rubber bladder B. The rubber bladder B and the rubber bag A bulge, and the flexible layer deforms and presses on the rotor; moreover, along the length direction from the root to the tip of the rotor, the air pressure injected into each rubber bladder B gradually increases; in addition, find the corresponding recorded deformation amount of the flexible layer according to the difference in the deformation amount of the twist angle, and then find the corresponding recorded pressure of the hot gas in the high-pressure hot gas source, so as to determine the air pressure injected into each rubber bladder B at each position.

[0031] After maintaining for a period of time, thermal correction is achieved;

[0032] S4. Cold correction;

[0033] After a period of time, open the switching valve on the output pipe and release the hot gas in the rubber bladder B; then switch to a high-pressure cold gas source, close the switching valve on the output pipe after ventilating for 1 to 10 seconds, inject high-pressure cold gas into the rubber bladder B, and the air pressure injected into each rubber bladder B at each position along the rotor length direction is kept consistent with the corresponding air pressure of the hot gas; in the initial stage, after the rubber bladder B expands, it drives the rubber bag A to expand, and the flexible layer deforms and clamps the rotor; subsequently, under the action of the cold gas, the liquid metal solidifies, so that the rotor is rigidly clamped.

[0034] After maintaining for a period of time, cold correction is achieved; when the pressure values of the pressure sensors at each position on the flexible layer tend to be consistent, the correction is completed.

[0035] In some advantageous embodiments, in step S4, after the liquid metal solidifies, open the switching valve of the output pipe of the rubber bladder B with a small release amount, and at the same time keep the corresponding amount of cold gas entering the input pipe to maintain the low temperature of the rubber bladder B.

[0036] In some advantageous embodiments, when performing the corrections in steps S1 to S4, it is not necessary to perform the calibration of S1 before each correction operation of S2 to S3; the auxiliary equipment performs the calibration work of S1 every fifteen days.

[0037] The present invention has the following advantages:

[0038] (1) Under the condition of simple correction operation, the correction accuracy is higher.

[0039] Generally, a simple way to correct the rotor is that when using such as Figure 2After the torsion angle measurement tool shown is used to complete the measurement, the rotor is clamped with the recommended tool with a clamping gap, and then the rotor is manually deformed for correction; this manual correction method highly depends on the work experience of the staff, and the degree of correction each time is uncontrollable, resulting in inaccurate correction.

[0040] In this solution, an auxiliary device with a long clamping gap is also used, but a rubber bag A that can expand controllably is provided on one gap surface of the clamping gap. During the correction process, along the length direction of the rotor from the root to the tip (when the rotor is deformed, the closer to the root, the smaller the degree of deformation, and the farther from the root, the greater the degree of deformation), so the degree of deformation of each rubber bag A along this length direction gradually increases. First, obtain the "relationship curve between the deformation amount of the flexible layer and the pressure of the hot air" through calibration, and then measure "how much deformation amount of the flexible layer is required to complete the torsion angle deformation amount at a certain position of the rotor length". Then, after measuring the deformation sizes of the torsion angles at each position of the rotor length, directly find out how much gas source pressure is required at this position, and then apply the gas source pressure for correction. The correction accuracy of this method is higher than that of the general manual recommended correction, and the correction is extremely convenient (it only takes time to calibrate the auxiliary tool, but it is not necessary to calibrate every time before correction, just calibrate once every about fifteen days). Therefore, it can be said that under the condition of simple correction operation, the correction accuracy is higher and the correction is more controllable.

[0041] (2) It is easier to correct, and the correction effect is better - it is not easy to rebound after correction.

[0042] During the general simple correction process of the rotor, the rotor is rigidly clamped and then the torsion angle is corrected. This kind of correction is prone to overcorrection, resulting in poor correction effect.

[0043] In this solution, first perform thermal correction and then perform cold correction; during the thermal correction, the rotor is flexibly clamped, and during this process, the rotor is gradually corrected (it is not necessary to correct it in place); then during the cold correction process, it gradually changes from flexible clamping to rigid clamping, and after the rotor is gradually corrected, it is kept for a period of time under the action of rigid clamping to prevent the rotor from rebounding. This gradual correction method makes the correction effect better (it is not easy to rebound after correction). Brief Description of the Drawings

[0044] Figure 1 It is a schematic structural diagram of a rotor (blade) of a helicopter;

[0045] Figure 2 It is a simple measurement tool for measuring the torsion angle of a helicopter rotor;

[0046] Figure 3 It is a schematic structural diagram of the present invention;

[0047] Figure 4 Schematic structural diagram of the first perspective of the upper splint;

[0048] Figure 5 Schematic structural diagram of the second perspective of the upper splint;

[0049] Figure 6 Schematic structural diagram of the third perspective of the upper splint;

[0050] Figure 7 Schematic structural diagram of rubber bladder B placed inside rubber bag A;

[0051] Figure 8 Schematic photo of rubber bag A;

[0052] In the figure: 10 - upper splint, 11 - rubber bag A, 12 - rubber bladder B, 13 - flexible layer, 14 - pore channel;

[0053] 20 - lower splint, 30 - long clamping gap, 40 - strip plate, 50 - back plate, 60 - handle. Detailed implementation manners

[0054] The present invention will be further described below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0055] It should be noted that the orientation or positional relationship indicated by "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0056] It should be noted that, without conflict, the embodiments in the present invention and the features and technical solutions in the embodiments can be combined with each other.

[0057] After a helicopter has been working for a period of time, its rotor will be deformed, that is, the torsion angle of the rotor will change, and its torsion angle will gradually increase from the root of the rotor to the end of the rotor along the length direction. Therefore, it is necessary to measure the torsion angle of the rotor at various positions in the length direction to obtain the deformation amount of the torsion angle, so as to correct the deformation of the torsion angle. At present, there are many methods for measuring torsion angle and many methods for correcting torsion angle. Now, there are some complex torsion angle measurement methods and complex correction methods, the effect of which is that the torsion angle measurement is more accurate and the correction is more accurate, but the problem is that the operation is more complicated. Therefore, some simple torsion angle measurement methods and some simple correction methods that exist now still have their significance and value in some special cases (such as time is tight and the workload is large).

[0058] Therefore, the auxiliary device and adjustment method for helicopter rotor adjustment provided by the present invention is a simple method for adjusting the torsion angle. Before adjustment and correction, the present invention generally requires the use of a simple torsion angle measurement method (any simple measurement method is acceptable), for example, Figure 2 The tool shown is as follows: Under the deformed rotor, a strip reference plate is fixed (the relative position between the rotor and the strip reference plate is maintained, and the strip reference plate is preferably set horizontally - it is also possible not to set it horizontally). Figure 2 The handle of the tool (the part with the boss) is fitted with the lower surface of the bar reference plate. Figure 2 The graduated arc of the tool fits against one of the long edges of the rotor and slides along the length of the rotor. Figure 2 The tool in the tool will point to different scale positions, that is, we get the required torsion angle (when the bar reference plate is in the horizontal plane, the torsion angle is the real torsion angle, if it is in the horizontal plane, the torsion angle is the relative torsion angle - the torsion angle relative to the bar reference plate, but in either case, it does not affect the subsequent calibration). Of course, if necessary, you can also choose some conventional torsion angle measurement methods.

[0059] The embodiment of the present specification provides an auxiliary device for adjusting the rotor blades of a helicopter, including an upper clamping part and a lower clamping part, and a long clamping gap is formed between the upper clamping part and the lower clamping part. A groove is opened on a gap surface of the long clamping gap, and a plurality of rubber bags A are laid flat in the groove, and then covered with a flexible layer, so that a gap surface of the long clamping gap forms a clamping surface with a special structure. A plurality of pressure sensors are arranged at intervals on the flexible layer along the length direction of the long clamping gap. A rubber bladder B is placed in the rubber bag A, and a closed cavity is formed between the two, and the cavity is filled with liquid metal; in addition, the rubber bladder B has an input pipeline and an output pipeline, and the input pipeline and the output pipeline both pass through the rubber bag A; and each rubber bladder B is connected to a high-pressure hot air source and a high-pressure cold air source respectively through corresponding pipelines, and when working, only one of the high-pressure hot air source and the high-pressure cold air source can be connected to the rubber bladder B.

[0060] During calibration adjustment: Place the deformed rotor blade in the long clamping gap; Inject hot air into rubber bag B through a high-pressure hot air source, so that rubber bag A and the flexible layer are deformed. The hot air makes the liquid metal in a molten state. During this process, the rotor blade is flexibly clamped, and over time, the rotor blade gradually deforms under the action of the clamping force and is corrected; Then switch to a high-pressure cold air source. In the initial stage, the cold air can also deform rubber bag A and the flexible layer. When the subsequent cold air can solidify the liquid metal well, the rotor blade is rigidly clamped. After being rigidly clamped for a period of time, the rotor blade resumes correction.

[0061] And during calibration, when injecting hot air / cold air into rubber bladder B, the air pressure injected into rubber bladder B at each position along the length direction from the root to the outer end of the rotor blade gradually increases (this is consistent with the fact that the twist angle of the rotor blade gradually increases from the root to the outer end). By controlling the air pressure injected into rubber bladder B, the amount of deformation that the rotor blade corresponding to the position of this rubber bladder B should be corrected is controlled, achieving precise control. This calibration method is simple and the operation is not complicated. At the same time, the accuracy of calibration is guaranteed to a certain extent.

[0062] When selecting the liquid metal, it is best to select a liquid alloy that can be solidified at 5 °C.

[0063] The following will combine Figure 1 — Figure 8 A detailed description will be given of an auxiliary device for helicopter rotor blade adjustment involved in the embodiments of the present application. It should be noted that the following embodiments are only used to explain the present application and do not constitute a limitation to the present application.

[0064] Figure 1 is an auxiliary device for helicopter rotor blade adjustment shown according to some embodiments of this specification.

[0065] The auxiliary device includes an upper clamping part and a lower clamping part. The upper clamping part has an upper clamping plate 10, and the lower clamping part has a lower clamping plate 20. A groove is formed on the lower surface of the upper clamping plate 10. A plurality of rubber bags A11 are placed in the groove in an array. A flexible layer 13 is fixedly covered on the lower surface of the upper clamping plate 10. The edge of the flexible layer 13 is fixed on the surface of the upper clamping plate 10 with glue. No groove is opened on the lower clamping plate 20 and no corresponding rubber bag A is provided, but a flexible layer 13 is still covered on its surface. The upper clamping plate 10 with the flexible layer 12 and the lower clamping plate 20 with the flexible layer 13 are arranged opposite to each other. The rear edge parts of the two are separated by a strip plate 40, so that the front edge parts of the upper clamping plate 10 and the lower clamping plate 20 form a long clamping gap 30. In addition, a plurality of pressure sensors are arranged at intervals along the length direction of the long clamping gap 30 on the flexible layer 13.

[0066] The following will further describe the structure of the rubber bag A11. Refer toFigure 7 , a rubber bag A11 contains a rubber bladder B12. The rubber bladder B12 is connected to an input pipeline and an output pipeline, and the input pipeline and the output pipeline pass through the rubber bag A11. A closed cavity is formed between the rubber bag A11 and the rubber bladder B12, and a liquid metal is filled in this cavity; each rubber bladder B12 is respectively connected to a high-pressure hot gas source and a high-pressure cold gas source through corresponding pipelines, and only one of the high-pressure hot gas source and the high-pressure cold gas source can be connected to the rubber bladder B12 during operation.

[0067] Further, the connection between the rubber bladder B12 and the high-pressure hot gas source means that: a pressure gauge and a corresponding switching valve are provided on the intake pipe of the rubber bladder B12, and corresponding switching valves are also provided on the outlet pipe of the rubber bladder B12; the intake pipe is sequentially connected to a three-way valve, a heating device, and a nitrogen cylinder A with adjustable output pressure. The connection between the rubber bladder B12 and the high-pressure cold gas source means that: when the intake pipe is connected to the three-way valve, the three-way valve is also sequentially connected to a cooling device and a nitrogen cylinder B with adjustable output pressure through a shunt pipeline. Nitrogen with adjustable output pressure is output through the nitrogen cylinder A, and the output nitrogen is heated through the heating device; nitrogen with adjustable output pressure is output through the nitrogen cylinder A, and the nitrogen is cooled through the cooling device, and the reduced temperature can solidify the liquid metal.

[0068] Even further, refer to Figure 4 and Figure 5 , holes 14 for leading out the input pipeline and the output pipeline of the rubber bladder B12 are opened in the groove of the upper clamping plate 10.

[0069] It should be noted that a plurality of cord straps are arranged on the rubber bladder B12 for convenience. When the capsules B12 are arranged in an array in the groove of the upper clamping plate 10, the cord straps at the contact edges of adjacent rubber bladders B12 are tied.

[0070] In some embodiments, the auxiliary device is further designed. Refer to Figure 3 Back plates 50 are respectively provided on the backs of the upper clamping plate 10 and the lower clamping plate 20. After the handle 60 with a U-shaped groove head clamps the upper clamping plate 10, the lower clamping plate 20, the strip-shaped plate 40, and the corresponding two back plates 50 together, they are fixed by bolts. The back plates 50 prevent the upper clamping plate 10 and the lower clamping plate 20 from being damaged, and the handle 60 facilitates picking up the entire auxiliary device.

[0071] In some embodiments, refer to Figures 3 - 5 , the upper clamping plate 10 and the lower clamping plate 20 are respectively warped towards the back at the front edge, so that the long clamping gap 30 is flared at the front edge. When the long clamping gap 30 clamps the rotor, it is convenient for the rotor to be inserted.

[0072] The embodiment of this specification also provides an adjustment method for helicopter rotor adjustment, which is realized based on the above auxiliary device, and specifically includes the following steps:

[0073] S1. Calibration;

[0074] S11. Connect the rubber bladder B12 to the high-pressure hot gas source, open the on-off valves on the input pipe and the output pipe, and melt the liquid metal by the hot gas in the high-pressure hot gas source;

[0075] S12. After a period of time, place calibration strip plates of different thicknesses at the long clamping gap 30, and then close the on-off valve on the output pipe; then inject hot gas into the rubber bladder B12, causing the rubber bladder B12, the rubber bag A11, and the flexible layer 13 to bulge and deform. Measure the relationship between the deformation amount of the bulge of the flexible layer 13 in the thickness direction of the long clamping gap 30 and the pressure of the hot gas provided by the high-pressure hot gas source, and record it; establish a "relationship curve between the deformation amount of the flexible layer and the pressure of the hot gas";

[0076] S13. In addition, through experiments, it is also measured that the amount of torsional angle deformation at a certain position of the length of the corresponding type of rotor blade and how much deformation of the flexible layer can be completed, and then establish the corresponding curve;

[0077] It should be noted that during adjustment (calibration), it is not necessary to perform the operation of S1 every time. S11 and S12 can be performed about every fifteen days; S13 can be performed once every quarter or half a year; and it is not necessary to perform the calibration of S1 before calibration. The staff can calibrate the equipment at the above specified time;

[0078] S2. Measurement;

[0079] Measure the length of a single rotor blade of the helicopter with a length measuring tool, and then divide the length of the rotor blade into multiple equal-length units; then use a torsional angle measuring unit to measure the deformation difference of the torsional angles at both ends of the equal-length units;

[0080] It should be noted that there are various methods for measuring the torsional angle. Any measurement method can be selected; here, a relatively simple conventional measurement method is recommended;

[0081] S3. Thermal correction;

[0082] Clamp the long clamping gap 30 of the auxiliary device on a single rotor blade of the helicopter, and support the auxiliary device on the ground through a bracket;

[0083] Connect the rubber bladder B12 to the high-pressure hot gas source, open the on-off valves on the input pipe and the output pipe, and melt the liquid metal by the hot gas in the high-pressure hot gas source;

[0084] After a period of time, close the switching valve on the output pipe; inject pressurized hot air into the rubber bladder B12. The rubber bladder B12 and the rubber bag A11 bulge, and the flexible layer 13 deforms and presses against the rotor; moreover, along the length direction from the root to the tip of the rotor, the air pressure injected into each rubber bladder B12 gradually increases; in addition, find the corresponding recorded deformation amount of the flexible layer 13 according to the difference in the deformation amount of the twist angle, and then find the corresponding recorded pressure of the hot air in the high-pressure hot air source, so as to determine the air pressure injected into each rubber bladder B12 at each position;

[0085] After maintaining for a period of time, thermal correction is achieved;

[0086] S4. Cold correction;

[0087] After a period of time, open the switching valve on the output pipe and release the hot air in the rubber bladder B12; then switch to the high-pressure cold air source, close the switching valve on the output pipe after ventilating for 1 to 10 seconds, inject high-pressure cold air into the rubber bladder B12, and the air pressure injected into each rubber bladder B12 at each position along the rotor length direction is kept consistent with the corresponding air pressure of the hot air; in the initial stage, after the rubber bladder B12 expands, it drives the rubber bag A11 to expand, and after the flexible layer 13 deforms, it clamps the rotor; subsequently, under the action of the cold air, the liquid metal solidifies, so that the rotor is rigidly clamped;

[0088] After maintaining for a period of time, cold correction is achieved; when the pressure values of the pressure sensors at each position on the flexible layer 13 tend to be consistent, the correction is completed.

[0089] The following further explains step S4. After the liquid metal solidifies, open the switching valve of the output pipe of the rubber bladder B12 with a small release amount, and at the same time keep the corresponding amount of cold air entering the input pipe to maintain the low temperature of the rubber bladder B12.

[0090] It should be noted that if the rotor does not meet the requirements after the correction is completed, thermal correction - cold correction can be carried out multiple times.

[0091] The above embodiments only express relatively preferred implementation manners, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An auxiliary device for helicopter rotor adjustment, characterized in that: It includes an upper clamping part and a lower clamping part, and a long clamping gap (30) is formed after the two are arranged oppositely; A groove is formed on one gap surface of the long clamping gap (30). After a plurality of rubber bags A (11) are laid flat in the groove, they are covered with a flexible layer (13). The flexible layer (13) is provided with a plurality of pressure sensors at intervals along the length direction of the long clamping gap (30); A rubber bladder B (12) is placed in the rubber bag A (11). The rubber bladder B (12) is connected to an input pipeline and an output pipeline, and the input pipeline and the output pipeline pass through the rubber bag A (11); A closed cavity is formed between the rubber bag A (11) and the rubber bladder B (12), and liquid metal is filled in this cavity; each rubber bladder B (12) is respectively connected to a high-pressure hot gas source and a high-pressure cold gas source through corresponding pipelines, and only one of the high-pressure hot gas source and the high-pressure cold gas source can be connected to the rubber bladder B (12) during operation; During calibration adjustment: Place the deformed rotor blade in the long clamping gap (30); Inject hot gas into the rubber bladder B (12) through the high-pressure hot gas source, so that the rubber bag A (11) and the flexible layer (13) are deformed, and the hot gas makes the liquid metal in a molten state; Then switch to the high-pressure cold gas source. In the initial stage, the cold gas can also deform the rubber bag A (11) and the flexible layer (13). Subsequently, the cold gas can solidify the liquid metal, so that the rotor blade is rigidly clamped, and after maintaining for a period of time, the calibration of the rotor blade is achieved.

2. The auxiliary device for helicopter rotor adjustment according to claim 1, characterized in that: In the connection of the rubber bladder B (12) to the high-pressure hot gas source and the high-pressure cold gas source through corresponding pipelines: When the rubber bladder B (12) is connected to the high-pressure hot gas source, it means that a pressure gauge and a corresponding switch valve are provided on the intake pipe of the rubber bladder B (12), and a corresponding switch valve is also provided on the outlet pipe of the rubber bladder B (12); The intake pipe is sequentially connected to a three-way valve, a heating device, and a nitrogen cylinder A with adjustable output pressure; When the rubber bladder B (12) is connected to the high-pressure cold gas source, it means that after the intake pipe is connected to the three-way valve, the three-way valve is also sequentially connected to a cooling device and a nitrogen cylinder B with adjustable output pressure through a shunt pipeline.

3. An auxiliary device for helicopter rotor adjustment according to claim 1 or 2, characterized in that: The upper clamping part includes an upper clamping plate (10). A groove is formed on the lower surface of the upper clamping plate (10). A plurality of rubber bands A (11) are placed in the groove in an array, and a flexible layer (13) is covered and fixed on the lower surface of the upper clamping plate (10); The lower clamping part includes a lower clamping plate (20). No groove is formed on the lower clamping plate (20), and a corresponding flexible layer (13) is covered and fixed on the upper surface of the lower clamping plate (20); The upper clamping plate (10) and the lower clamping plate (20) are arranged oppositely, and a strip-shaped plate (40) is clamped at their rear edges, and the three are fixed into a whole by bolts; After forming the whole shape, a long clamping gap (30) is formed in the front part of the upper clamping plate (10) and the lower clamping plate (20).

4. An auxiliary device for helicopter rotor adjustment according to claim 3, characterized in that: Corresponding back plates (50) are provided on the backs of the upper clamping plate (10) and the lower clamping plate (20). The handle (60) with a U-shaped groove head clamps the upper clamping plate (10), the lower clamping plate (20), the strip-shaped plate (40), and the corresponding two back plates (50) together and then is fixed by bolts.

5. An auxiliary device for helicopter rotor adjustment according to claim 3, characterized in that: The upper clamping plate (10) and the lower clamping plate (20) are respectively tilted toward the back at the front edges, so that the long clamping gap (30) is expanded at the front edges.

6. The auxiliary device for helicopter rotor adjustment according to claim 3, characterized in that: A channel (14) for leading out an input pipeline and an output pipeline of the rubber bag B (12) is provided in the groove of the upper clamping plate (10).

7. An adjustment method for helicopter rotor adjustment, characterized in that: The auxiliary device for adjusting the helicopter rotor according to any one of claims 1 to 6 is implemented, comprising the following steps: S1. Calibration; The rubber bag B (12) is connected to a high-pressure hot air source, and the switch valves on the input pipe and the output pipe are opened, so that the hot air in the high-pressure hot air source puts the liquid metal into a molten state; After a period of time, calibration strips of different thicknesses are placed at the long clamping gap (30), and then the switch valve on the output pipe is closed; hot air is then injected into the rubber bag B (12), causing the rubber bag B (12), the rubber bag A (11), and the flexible layer (13) to swell and deform, and the relationship between the swelled deformation of the flexible layer (13) in the thickness direction of the long clamping gap (30) and the pressure of the hot air provided by the high-pressure hot air source is measured and recorded; S2, measurement; The length of the single rotor of the helicopter is measured by a length measuring tool, and then the length of the rotor is divided into a plurality of equal length units; and then the torsion angle measuring unit is used to measure the deformation difference of the torsion angle at the two ends of the equal length unit; S3, thermal correction; The long clamping slot (30) of the auxiliary device is clamped on the single-piece rotor of the helicopter, and the auxiliary device is supported on the ground by a bracket; The rubber bag B (12) is connected to a high-pressure hot air source, and the switch valves on the input pipe and the output pipe are opened, so that the hot air in the high-pressure hot air source puts the liquid metal into a molten state; After a period of time, the switch valve on the output pipe is closed; pressurized hot air is injected into the rubber bag B (12), the rubber bag B (12) and the rubber bag A (11) swell, and the flexible layer (13) is deformed and pressed on the rotor; and the air pressure filled into each rubber bag B (12) gradually increases along the length defense line from the root to the end of the rotor; in addition, the corresponding recorded deformation of the flexible layer (13) is found according to the deformation difference of the torsion angle, and then the corresponding recorded pressure of the hot air in the high-pressure hot air source is found, so as to determine the air pressure filled into the rubber bag B (12) at each position; After a period of time, thermal correction is achieved; S4, cold correction; After a period of time, the switch valve on the output pipe is opened to release the hot air in the rubber bag B (12); then the high-pressure cold air source is switched to, and after ventilation for 1 to 10 seconds, the switch valve on the output pipe is closed to inject high-pressure cold air into the rubber bag B (12), and the air pressure filled into the rubber bag B (12) at each position along the length direction of the rotor is consistent with the air pressure corresponding to the hot air; in the initial stage, the rubber bag B (12) expands and drives the rubber bag A (11) to expand, and the flexible layer (13) is deformed to clamp the rotor; subsequently, under the action of the cold air, the liquid metal solidifies, so that the rotor is rigidly clamped; After being maintained for a period of time, cold calibration is achieved; when the pressure values ​​of the pressure sensors at various positions on the flexible layer (13) tend to be consistent, the calibration is completed.

8. A method for adjusting a helicopter rotor according to claim 7, characterized in that: In the said step S4, after the liquid metal solidifies, open the switch valve of the output pipe of the rubber bladder B(12) by a small release amount, and at the same time maintain the input pipe to introduce a corresponding amount of cold air to keep the rubber bladder B(12) at a low temperature.

9. A regulation method for helicopter rotor regulation according to claim 7 or 8, characterized in that: When calibrating the said steps S1 - S4, it is not necessary to perform the calibration of S1 before each calibration operation of S2 - S3; the auxiliary equipment performs the calibration of S1 every once in a while.

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