Auxiliary device for adjusting helicopter rotor wing and adjusting method

Abstract

The invention relates to an auxiliary device for correcting a helicopter rotor wing, and particularly discloses an auxiliary device for adjusting the helicopter rotor wing and an adjusting method.The auxiliary device comprises an upper clamping part and a lower clamping part, and the upper clamping part and the lower clamping part are oppositely arranged to form a long clamping gap; a groove is formed in one gap surface of the long clamping gap, and a plurality of rubber bags A are flatly laid in the groove and then are sealed and covered by a flexible layer; a rubber bag B is placed in the rubber bag A, the rubber bag B is communicated with an input pipeline and an output pipeline, and the input pipeline and the output pipeline penetrate through the rubber bag A; a closed cavity is formed between the rubber bag A and the rubber bag B, and liquid metal is filled in the cavity; each rubber bag B is respectively connected with a high-pressure hot air source and a high-pressure cold air source through corresponding pipelines and pumps, and only one of the high-pressure hot air source and the high-pressure cold air source is communicated with the rubber bag B during working. The method has the beneficial effects that the correction precision is higher under the condition that the correction operation is simple; and the correction effect is better, and rebounding is not prone to occurring after correction.

Description

Technical Field

[0001] The invention relates to the technical field of helicopter rotor correction, in particular to an auxiliary device and an adjustment method for helicopter rotor adjustment. 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 purpose of the present invention is achieved through the following technical solutions:

[0009] In a first aspect, an auxiliary device for adjusting a helicopter rotor comprises an upper clamping portion and a lower clamping portion, and the two are arranged relative to each other to form a long clamping gap;

[0010] A groove is formed on one of the gap surfaces of the long clamping gap, a plurality of rubber bags A are laid flat in the groove and then covered with a flexible layer, and a plurality of pressure sensors are arranged at intervals on the flexible layer along the length direction of the long clamping gap;

[0011] A rubber bag B is placed in the rubber bag A, and the rubber bag B is connected to the input pipeline and the 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 capsule B, and the cavity is filled with liquid metal; each rubber capsule B is connected to a high-pressure hot air source and a high-pressure cold air source through corresponding pipelines and pumps, and during operation, only one of the high-pressure hot air source and the high-pressure cold air source can be connected to the rubber capsule B;

[0013] During correction and adjustment: place the deformed rotor in a 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, and the hot air keeps the liquid metal in a molten state; then switch to a high-pressure cold air source. In the initial stage, the cold air can also deform the rubber bag A and the flexible layer, and the subsequent cold air can solidify the liquid metal, so that the rotor is rigidly clamped, and the rotor is corrected after a period of time.

[0014] In an advantageous embodiment, the rubber bag B is connected to a high-pressure hot air source and a high-pressure cold air source respectively through corresponding pipelines and pumps:

[0015] The rubber bag B is connected to the high-pressure hot gas source, which means: a pressure gauge and a corresponding switch valve are provided on the air inlet pipe of the rubber bag B, and a corresponding switch valve is also provided on the air outlet pipe of the rubber bag B; the air inlet pipe is connected to a three-way valve, a heating device, and a nitrogen bottle A with adjustable output pressure in sequence;

[0016] The rubber bag B is connected to the high-pressure cold air source, which means that when the air inlet pipe is connected to the three-way valve, the three-way valve is also connected to the cooling equipment and the nitrogen bottle B with adjustable output pressure in sequence through the branch line.

[0017] In a preferred embodiment, the upper clamping portion includes an upper clamping plate, the lower surface of which is provided with a groove, in which a plurality of rubber bands A are placed in an array, and a flexible layer is covered and fixed to the lower surface of the upper clamping plate; the lower clamping portion includes a lower clamping plate, the lower clamping plate does not have a groove, and the upper surface of the lower clamping plate is covered and fixed with a corresponding flexible layer; the upper clamping plate and the lower clamping plate are arranged opposite to each other, and the two clamp a strip plate at the rear edge, and the three are fixed into a whole by bolts; when the shape is integrated, 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, the backs of the upper and lower clamping plates are provided with corresponding back plates, and the upper and lower clamping plates, the strip plates and the corresponding two back plates are clamped together by a handle with a U-shaped groove head and then fixed with bolts.

[0019] In an advantageous embodiment, the upper clamping plate and the lower clamping plate are respectively tilted toward the back at the front edges, so that the long clamping gap is expanded at the front edges.

[0020] In an advantageous embodiment, a channel for leading out the input pipeline and the output pipeline of the rubber bag B is opened in the groove of the upper clamping plate.

[0021] In a second aspect, a method for adjusting a helicopter rotor is implemented using the auxiliary device, and specifically comprises the following steps:

[0022] S1. Calibration;

[0023] Connect the rubber bag B to the high-pressure hot air source, open the switch valves on the input pipe and the output pipe, and melt the liquid metal through the hot air in the high-pressure hot air source;

[0024] After a period of time, calibration strips of different thicknesses are placed at the long clamping gap, and then the switch valve on the output pipe is closed; hot air is then injected into the rubber bag B, causing the rubber bag B, rubber bag A, and flexible layer to bulge and deform. The relationship between the bulging deformation of the flexible layer in the thickness direction of the long clamping gap and the pressure of the hot air provided by the high-pressure hot air source is measured and recorded;

[0025] S2, measurement;

[0026] 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;

[0027] S3, thermal correction;

[0028] The long clamping slot 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;

[0029] Connect the rubber bag B to the high-pressure hot air source, open the switch valves on the input pipe and the output pipe, and melt the liquid metal through the hot air in the high-pressure hot air source;

[0030] After a period of time, the switch valve on the output pipe is closed; pressurized hot air is injected into the rubber bag B, the rubber bag B and the rubber bag A swell, the flexible layer is deformed and squeezed on the rotor; and the air pressure filled into each rubber bag B gradually increases along the length line from the root to the end of the rotor; in addition, the corresponding recorded deformation of the flexible layer 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 at each position;

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

[0032] S4, cold correction;

[0033] After a period of time, the switch valve on the output pipe is opened to release the hot air in the rubber bag B; 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. The air pressure filled into the rubber bag B at each position along the length of the rotor is consistent with the air pressure corresponding to the hot air; in the initial stage, the expansion of the rubber bag B drives the expansion of the rubber bag A, and the flexible layer 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;

[0034] After a period of time, cold calibration is achieved; when the pressure values ​​of the pressure sensors at various positions on the flexible layer tend to be consistent, the calibration is completed.

[0035] In some advantageous embodiments, in step S4, after the liquid metal solidifies, the switch valve of the output pipe of the rubber bag B is opened to release a small amount, while a corresponding amount of cold air is allowed to enter the input pipe to maintain the low temperature of the rubber bag B.

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

[0037] The present invention has the following advantages:

[0038] (1) When the calibration operation is simple, the calibration accuracy is higher.

[0039] The general method of simply correcting the rotor is to use Figure 2After the torsion angle measuring tool shown is used for measurement, the rotor is clamped using the recommended tool with a clamping gap, and then the rotor is manually deformed for correction. This manual correction method tests 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 be controlled to expand is provided on one of the gap surfaces of the clamping gap. During the calibration process, along the length direction from the root to the end of the rotor (when the rotor is deformed, the closer to the root, the smaller the deformation, and the farther away from the root, the greater the deformation), the deformation degree of each rubber bag A along the length direction gradually increases. The "relationship curve between the deformation amount of the flexible layer and the pressure of the hot air" is obtained by calibration in advance, and then the "size of the deformation amount of the torsion angle at a certain position of the rotor length, and the size of the flexible layer deformation required to complete it" is measured. Then, after the deformation size of the torsion angle at each position of the rotor length is measured, the air source pressure required at the position is directly found, and then the air source pressure is applied for calibration. The calibration accuracy of this method is higher than that of the general manual suggested calibration, and the calibration is extremely convenient (it only takes time to calibrate the auxiliary tool, but it does not need to be calibrated before each calibration, but only once every fifteen days). Therefore, it can be said that when the correction operation is simple, 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] In general, during simple correction of the rotor, the rotor is rigidly clamped and then the torsion angle is corrected. This type of correction is prone to over-correction, resulting in poor correction effect.

[0043] In this scheme, hot calibration is used first, followed by cold calibration. In hot calibration, the rotor is flexibly clamped, and the rotor is gradually calibrated during this process (it is not necessary to calibrate it completely). Then, in the cold calibration process, the flexible clamping is gradually changed to rigid clamping, so that the rotor is gradually calibrated, and then it is kept under rigid clamping for a period of time to prevent the rotor from rebounding. This gradual calibration method makes the calibration effect better (less likely to rebound after calibration). BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the structure of a helicopter rotor (blade);

[0045] Figure 2 It is a simple measuring tool for measuring the twist angle of helicopter rotors;

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

[0047] Figure 4 It is a structural schematic diagram of the upper splint from the first perspective;

[0048] Figure 5 A schematic diagram of the structure of the upper splint from a second perspective;

[0049] Figure 6 A schematic diagram of the structure of the upper splint from a third-person perspective;

[0050] Figure 7 It is a schematic diagram of the structure in which a rubber bag A is placed inside a rubber bag B;

[0051] Figure 8 This is a photo schematic diagram of rubber bag A;

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

[0053] 20-lower clamping plate, 30-long clamping gap, 40-strip plate, 50-back plate, 60-handle. DETAILED DESCRIPTION

[0054] The present invention is further described below in conjunction with 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 directions or positional relationships indicated by "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use, or are the directions or positional relationships commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0056] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may 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 correction and adjustment: the deformed rotor is placed in a long clamping gap; hot air is injected into rubber bag B through a high-pressure hot air source to deform rubber bag A and the flexible layer. The hot air melts the liquid metal. During this process, the rotor is flexibly clamped, and as time goes by, the rotor gradually deforms and is corrected under the action of the clamping force; then the high-pressure cold air source is switched to. 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, the rotor is rigidly clamped. After a period of rigid clamping, the rotor resumes correction.

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

[0062] When choosing liquid metal, it is best to choose liquid alloy that can solidify at 5°C.

[0063] The following will be combined Figure 1 — Figure 8 An auxiliary device for adjusting a helicopter rotor blade according to an embodiment of the present application is described in detail. It should be noted that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.

[0064] Figure 1 The invention relates to an auxiliary device for adjusting helicopter rotor blades according to some embodiments of the present 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 provided on the lower surface of the upper clamping plate 10, and a plurality of rubber bags A11 are placed in an array in the groove. A flexible layer 13 is covered and fixed on the lower surface of the upper clamping plate 10, and the edge of the flexible layer 13 is fixed to the surface of the upper clamping plate 10 by glue. No groove is provided on the lower clamping plate 20, nor is a corresponding rubber bag A provided, but the surface thereof is still covered with a flexible layer 13. The upper clamping plate 10 having the flexible layer 12 and the lower clamping plate 20 having the flexible layer 13 are arranged opposite to each other, and the rear edges of the two are separated by a strip plate 40, so that the upper clamping plate 10 and the lower clamping plate 20 form a long clamping gap 30 at the front edges of the plates. In addition, a plurality of pressure sensors are provided at intervals on the flexible layer 13 along the length direction of the long clamping gap 30.

[0066] The structure of the rubber bag A11 is further described below. Figure 7 A rubber bag B12 is placed inside the rubber bag A11. The rubber bag B12 is connected to the input pipeline and the 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 bag B12, and the cavity is filled with liquid metal; each rubber bag B12 is connected to a high-pressure hot air source and a high-pressure cold air source through corresponding pipelines, and during operation, only one of the high-pressure hot air source and the high-pressure cold air source can be connected to the rubber bag B12.

[0067] Furthermore, the rubber bag B12 is connected to the high-pressure hot air source, which means that: a pressure gauge and a corresponding switch valve are provided on the air inlet pipe of the rubber bag B12, and a corresponding switch valve is also provided on the air outlet pipe of the rubber bag B12; the air inlet pipe is connected in sequence to the three-way valve, the heating device, and the nitrogen bottle A with adjustable output pressure. The rubber bag B12 is connected to the high-pressure cold air source, which means that: after the air inlet pipe is connected to the three-way valve, the three-way valve is also connected in sequence to the cooling device and the nitrogen bottle B with adjustable output pressure through a branch line. The nitrogen with adjustable pressure is output through the nitrogen bottle A, and the output nitrogen is heated by the heating device; the nitrogen with adjustable nitrogen is output through the nitrogen bottle A, and the nitrogen is cooled by the cooling device, and the reduced temperature can solidify the liquid metal.

[0068] For further information, see Figure 4 and Figure 5 A channel 14 for leading out the input pipeline and output pipeline of the rubber bag B12 is opened in the groove of the upper clamping plate 10.

[0069] It should be noted that a plurality of ropes are provided on the rubber capsules B12. When the rubber capsules B12 are arranged in an array in the groove of the upper clamping plate 10, the ropes at the contact edges of the adjacent rubber capsules B12 are bound.

[0070] In some embodiments, the auxiliary device is further designed. Figure 3 The upper clamping plate 10 and the lower clamping plate 20 are provided with corresponding back plates 50 on their backs, and the upper clamping plate 10, the lower clamping plate 20, the strip plate 40 and the corresponding two back plates 50 are clamped together by a handle 60 with a U-shaped groove and then 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 the whole auxiliary device to be picked up.

[0071] In some embodiments, see Figure 3-Figure 5 , the upper clamping plate 10 and the lower clamping plate 20 are respectively tilted toward the back at the front edge, so that the long clamping slit 30 is expanded at the front edge. When the long clamping slit 30 clamps the rotor, it is convenient to insert the rotor.

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

[0073] S1. Calibration;

[0074] S11, connect the rubber bag B12 to the high-pressure hot air source, open the switch valves on the input pipe and the output pipe, and melt the liquid metal through the hot air in the high-pressure hot air source;

[0075] S12. After a period of time, place calibration strips of different thicknesses at the long clamping gap 30, and then close the switch valve on the output pipe; then inject hot air into the rubber bag B12, causing the rubber bag B12, the rubber bag A11, and the flexible layer 13 to bulge and deform, and measure the relationship between the bulging 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, and record them; establish a "relationship curve between the deformation of the flexible layer and the pressure of the hot air";

[0076] S13. In addition, the magnitude of the torsion angle deformation of the corresponding type of rotor at a certain position of its length and the corresponding flexible layer deformation that can be completed are measured through experiments, and then the corresponding curve is established;

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

[0078] S2, measurement;

[0079] 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;

[0080] It should be noted that there are many methods for measuring torsion angle, and any measurement method can be used; here we recommend the simpler conventional measurement method;

[0081] S3, thermal correction;

[0082] 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;

[0083] Connect the rubber bag B12 to the high-pressure hot air source, open the switch valves on the input pipe and the output pipe, and melt the liquid metal through the hot air in the high-pressure hot air source;

[0084] After a period of time, the switch valve on the output pipe is closed; pressurized hot air is injected into the rubber bag B12, the rubber bag B12 and the rubber bag A11 swell, and the flexible layer 13 is deformed and squeezed on the rotor; and the air pressure filled into each rubber bag B12 gradually increases along the length defense line from the root of the rotor to the end; 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 B12 at each position;

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

[0086] S4, cold correction;

[0087] After a period of time, the switch valve on the output pipe is opened to release the hot air in the rubber bag B12; 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 B12, and the air pressure filled into the rubber bag B12 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 B12 expands and drives the rubber bag A11 to expand, and the flexible layer 13 deforms and clamps the rotor; subsequently, under the action of the cold air, the liquid metal solidifies, so that the rotor is rigidly clamped;

[0088] After 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.

[0089] Step S4 is further described below. When the liquid metal solidifies, the switch valve of the output pipe of the rubber bag B12 is opened to release a small amount, while keeping a corresponding amount of cold air entering the input pipe to maintain the low temperature of the rubber bag B12.

[0090] It should be noted that if the rotor does not meet the requirements after calibration, hot calibration and cold calibration can be performed multiple times.

[0091] The above embodiments only express preferred implementation modes, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. An auxiliary device for adjusting helicopter rotors, characterized in that: It comprises an upper clamping part and a lower clamping part, which are arranged relative to each other to form a long clamping gap (30); A groove is formed on a groove surface of the long clamping gap (30), a plurality of rubber bags A (11) are laid flat in the groove and then covered with a flexible layer (13), and a plurality of pressure sensors are arranged at intervals on the flexible layer (13) along the length direction of the long clamping gap (30); A rubber bag B (12) is placed in the rubber bag A (11), and the rubber bag B (12) is connected to the input pipeline and the 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 capsule B (12), and the cavity contains liquid metal; each rubber capsule B (12) is connected to a high-pressure hot air source and a high-pressure cold air source through corresponding pipelines, and during operation, only one of the high-pressure hot air source and the high-pressure cold air source can be connected to the rubber capsule B (12); During correction and adjustment: the deformed rotor is placed in the long clamping gap (30); hot air is injected into the rubber bag B (12) via a high-pressure hot air source, thereby causing the rubber bag A (11) and the flexible layer (13) to deform, and the hot air causes the liquid metal to be in a molten state; then the high-pressure cold air source is switched to, and the cold air in the initial stage can also cause the rubber bag A (11) and the flexible layer (13) to deform, and the subsequent cold air can solidify the liquid metal, thereby causing the rotor to be rigidly clamped, and after a period of time, the rotor is corrected.

2. The auxiliary device for helicopter rotor adjustment according to claim 1, characterized in that: The rubber bag B (12) is connected to the high-pressure hot air source and the high-pressure cold air source through corresponding pipelines: The rubber bag B (12) is connected to the high-pressure hot gas source, which means that: a pressure gauge and a corresponding switch valve are provided on the air inlet pipe of the rubber bag B (12), and a corresponding switch valve is also provided on the air outlet pipe of the rubber bag B (12); the air inlet pipe is connected to a three-way valve, a heating device, and a nitrogen bottle A with adjustable output pressure in sequence; The rubber bag B (12) is connected to the high-pressure cold air source, which means that when the air inlet pipe is connected to the three-way valve, the three-way valve is also connected to the cooling device and the output pressure-adjustable nitrogen bottle B in sequence through the branch pipeline.

3. An auxiliary device for helicopter rotor adjustment according to claim 1 or 2, characterized in that: The upper clamping part comprises an upper clamping plate (10), the lower surface of the upper clamping plate (10) is provided with a groove, a plurality of rubber bands A (11) are arranged in an array in the groove, and a flexible layer (13) is covered and fixed on the lower surface of the upper clamping plate (10); The lower clamping portion comprises a lower clamping plate (20), the lower clamping plate (20) is not provided with a groove, and the upper surface of the lower clamping plate (20) is covered and fixed with a corresponding flexible layer (13); The upper clamping plate (10) and the lower clamping plate (20) are arranged opposite to each other, and a strip plate (40) is clamped between the two at the rear edges, and the three are fixed into a whole by bolts; when the shape is integrated, a long clamping gap (30) is formed in the front part of the upper clamping plate (10) and the lower clamping plate (20).

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

5. The 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. A method for adjusting a helicopter rotor, 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. The method for adjusting a helicopter rotor according to claim 7, characterized in that: In the step S4, when the liquid metal solidifies, the switch valve of the output pipe of the rubber bag B (12) is opened to release a small amount, while keeping a corresponding amount of cold air entering the input pipe to maintain the low temperature of the rubber bag B (12).

9. A method for adjusting a helicopter rotor according to claim 7 or 8, characterized in that: When the calibration of steps S1 to S4 is performed, it is not necessary to calibrate S1 every time before the calibration of steps S2 to S3; the auxiliary equipment performs the calibration of S1 once at a certain interval.

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