Aircraft generator assembly maintenance device and maintenance method

Abstract

The present invention discloses an aircraft generator component maintenance device, comprising: a gantry movably mounted above a base; a pair of grinding assemblies movably mounted on the inner side of the gantry; a clamping assembly fixedly mounted on the upper end surface of the base; a track mounted above the base, a slider mounted on the axis track; the gantry comprising a pair of columns and an I-beam fixedly connected to the upper end surfaces of the pair of columns, and the pair of columns fixedly mounted on the upper end surfaces of the pair of sliders; tracks mounted on opposite sides of the pair of columns, each of which is mounted with a slider, and a pair of grinding assemblies mounted on the two sliders; the grinding assembly comprises an electric push rod and a grinding head element. In the aircraft generator component maintenance device of the present invention, the grinding assembly can achieve full coverage of the grinding area by moving in the X-axis, Z-axis, and Y-axis directions, and can grind both sides of the turbine blade simultaneously, thereby improving the grinding efficiency.

Description

Technical Field

[0001] The present invention relates to the field of aerospace generator maintenance, and in particular to an aerospace generator component maintenance device and maintenance method. Background Art

[0002] A ram air turbine is an emergency turbine generator used by aircraft when the engine shuts down and the auxiliary power system fails completely. It is driven by the ram air pressure generated by the aircraft during flight and provides limited auxiliary power for the cockpit and flight control systems.

[0003] During the regular maintenance of ram air turbines, the turbine blades need to be polished. To ensure the efficiency and quality of polishing, a robot-based automatic control polishing system is now often used. During the polishing process, the polishing force is required to be at a certain threshold and the system must be highly adaptable to the shape of the turbine blade surface.

[0004] Existing automated grinding systems are still inadequate for grinding complex blade surfaces: During the grinding process, both sides of the blade must be ground separately, impacting grinding efficiency. The grinding head is equipped with a pressure sensor. When the pressure reaches a threshold, the sensor sends a pressure signal back to the control system, which instructs the grinding head to stop approaching the blade. However, due to signal transmission lag, this can easily lead to excessive compression of the blade surface, affecting grinding quality. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0006] In one aspect, the present invention provides an aircraft generator assembly maintenance device, comprising:

[0007] base;

[0008] A gantry is movably mounted above the base;

[0009] The grinding assembly is configured as a pair and is installed on the inner side of the gantry so as to be movable up and down;

[0010] A clamping assembly, fixedly mounted on the upper end surface of the base, for clamping the turbine blades;

[0011] A pair of X-axis rails are installed above the base, and an X-axis slider is installed on each X-axis rail;

[0012] The gantry includes a pair of columns and an I-beam fixedly connected to the upper end surfaces of the pair of columns, and the pair of columns are fixedly installed on the upper end surfaces of a pair of X-axis sliders;

[0013] A Z-axis track is installed on the opposite side of a pair of columns, a Z-axis slider is installed on each Y-axis track, and a pair of grinding assemblies are installed on the two Z-axis sliders respectively;

[0014] Among them, the grinding assembly includes an electric push rod and a grinding head element. The electric push rod includes a fixed end and an action end. The fixed end is fixedly installed on the Z-axis slider, and the action end can be extended and retracted relative to the fixed end. The grinding head element is installed at the end of the action end away from the fixed end.

[0015] Furthermore, the turbine blade includes a fixing portion and a blade fixedly arranged at one end of the fixing portion, and the fixing portion is fixedly clamped in the clamping assembly;

[0016] The side of the leaf that is concave inward is the concave side, and the other side is the convex side;

[0017] The grinding assembly on the concave surface side is a concave grinding assembly, and the grinding assembly on the convex surface side is a convex grinding assembly.

[0018] Furthermore, the action end includes an inner rod and an outer rod, the inner rod can be extended and retracted relative to the fixed end, the outer rod is sleeved on the outer side of the inner rod and contacts the inner rod, and the grinding head element is installed at the end of the outer rod away from the fixed end;

[0019] Among them, when the inner rod is shortened, the inner rod and the outer rod are relatively fixed; when the inner rod is extended and the extrusion pressure of the grinding head element 320 on the blade does not exceed the threshold, the inner rod and the outer rod are relatively fixed; when the inner rod is extended and the extrusion pressure of the grinding head element on the blade exceeds the threshold, the inner rod and the outer rod move relative to each other.

[0020] Furthermore, the end of the inner rod is an arc-shaped area, and the arc-shaped area is surrounded by an arc surface and a plane, and the outer rod is provided with a through hole, and the shape of the through hole matches the arc-shaped area;

[0021] The arc-shaped area is provided with an active structure, and the through hole is provided with a driven structure, and the active structure is in contact with the driven structure;

[0022] When the active structure and the driven structure are engaged, the inner rod and the outer rod are relatively fixed; when the active structure and the driven structure are disengaged, the inner rod and the outer rod move relatively.

[0023] Furthermore, the active structure includes a groove and a sliding plate arranged inside the groove and capable of being raised and lowered. The groove is opened on the plane of the arc-shaped area, and a plurality of linear array meshing teeth are fixedly mounted on the upper end surface of the sliding plate.

[0024] The driven structure is a plurality of linear array meshing grooves provided on the upper end surface of the through hole, and the shape of the meshing grooves matches the meshing teeth;

[0025] Wherein, an elastic member is provided between the upper end surface of the groove and the lower end surface of the sliding plate, and the elastic coefficient of the elastic member matches the extrusion force threshold of the grinding head element on the blade;

[0026] Furthermore, a distance sensor is arranged on the sliding plate.

[0027] Furthermore, the cross section of the meshing teeth is a right triangle, and the surface corresponding to the right angle side is far away from the grinding head element, and the surface corresponding to the oblique side is close to the grinding head element.

[0028] Furthermore, the grinding head elements of the concave grinding assembly and the grinding head elements of the convex grinding assembly are staggered in the X-axis direction, and a torque compensation assembly is provided on the side of the grinding head element close to the clamping assembly, and the torque compensation assembly is in contact with the turbine blade;

[0029] The torques applied by the grinding head elements of the recessed grinding assembly and the grinding head elements of the protruding grinding assembly to the blades and the torque applied by the torque compensation assembly to the blades are kept balanced.

[0030] Furthermore, a biasing plate is fixedly mounted on one end of the outer rod close to the grinding head element, and the biasing plate protrudes from the outer rod in the X-axis direction. The grinding head element is mounted on the biasing plate and is located on one side of the outer rod.

[0031] Furthermore, the fixing portion is configured as a rectangular body, and a clamping groove is opened on the side of the clamping assembly, and the height of the clamping groove is the same as that of the fixing portion, and the width of the clamping groove is slightly larger than the width of the fixing portion;

[0032] A mounting groove is provided on one side wall of the clamping groove, and the mounting groove and the proximal recessed grinding assembly are located on the same side of the blade, and the torque compensation assembly is installed in the mounting groove.

[0033] In another aspect, the present invention provides a method for repairing an aircraft generator assembly, using the above-mentioned device, the method comprising the following steps:

[0034] S1. According to the position of the turbine blade to be polished, the polishing area is evenly divided into n areas along the X axis, and the i-th area is evenly divided into m areas along the Z axis. i points, where i = 1, 2, ..., n;

[0035] S2. Move the grinding assembly to the first area at the far end through the X-axis slider, and move the grinding assembly to the first point S at the upper edge of the first area through the Z-axis slider. 11 , use the electric push rod to make the grinding head element contact with the concave surface and the convex surface respectively, start the grinding head element to start grinding S 11 Point;

[0036] S3, S 11 After the point grinding is completed, stop the grinding head component; then, move the grinding component down to S through the Z-axis slider. 12At the same time, the concave grinding component extends and the convex grinding component shortens, and the grinding head element contacts the concave surface and the convex surface respectively, and the grinding head element starts to grind S 12 Point;

[0037] S4, S 12 After the point grinding is completed, repeat the second step until the grinding head element grinds the lowest point of the concave surface; where j1 = 1, 2, ..., m1;

[0038] S5, After the point grinding is completed, stop the grinding head component; then, move the grinding component downward through the Z-axis slider. At the same time, the concave grinding component shortens and the convex grinding component lengthens, and the grinding head element contacts the concave surface and the convex surface respectively, and the grinding head element starts to grind Point;

[0039] S6, After the point grinding is completed, repeat the above S5 until the grinding head element grinds the blade. Point;

[0040] S7, After the point grinding is completed, stop the grinding head element; then, move the grinding assembly to the proximal end to the second area through the X-axis slider, and use the electric push rod to make the grinding head element contact the concave surface and the convex surface respectively, and start the grinding head element to start grinding S 21 Point;

[0041] S8, repeat the above steps S3 to S6;

[0042] S9, After the point grinding is completed, stop the grinding head element; then, move the grinding assembly to the proximal end to the third area through the X-axis slider, and use the electric push rod to make the grinding head element contact the concave surface and the convex surface respectively, and start the grinding head element to start grinding S 31 Point;

[0043] S10, repeat the above steps S3 to S8, polishing in sequence Points, until the last point After grinding, the repair of all grinding areas is completed; i =1, 2, ..., m i .

[0044] Furthermore, before step S1, the process further includes step S0, For point grinding, the elastic coefficient of the elastic element is configured according to the threshold of the extrusion force of the grinding head element on the blade;

[0045] Among them, in the steps S2 to S10, before the grinding head element is started, the grinding head element of the concave grinding assembly and the grinding head element of the convex grinding assembly are close to and squeeze the blade. When the distance sensor detects the height change of the sliding plate, the driving of the inner rod to extend is stopped, and then the grinding head element is started to start grinding. Point.

[0046] Furthermore, before step S1, the process further includes step S0, For point grinding, the force value applied by the torque compensation component to the blade is pre-configured according to the threshold of the extrusion force of the grinding head element on the blade, so that the torque applied by the grinding head element of the concave grinding component and the grinding head element of the convex grinding component on the blade, as well as the torque applied by the torque compensation component on the blade, reach a balanced state;

[0047] Wherein, in said steps S2 to S10, when the pressure sensor of the torque compensation assembly detects that the force applied to the torque compensation assembly deviates from a preset force value, the operation of the aircraft generator assembly maintenance device is stopped and the elastic coefficient of the elastic member is reconfigured.

[0048] Compared with the prior art, the present invention has the following advantages:

[0049] In the aircraft generator assembly maintenance device of the present invention, the grinding assembly can achieve full coverage of the grinding area by moving in the X-axis, Z-axis and Y-axis directions, and can grind both sides of the turbine blade simultaneously, thereby improving the grinding efficiency.

[0050] The aircraft generator assembly maintenance device of the present invention automatically stops pressing the blade when the grinding head element's compressive force on the blade exceeds a threshold, preventing the grinding depth from exceeding a safe threshold and causing surface damage. Furthermore, it is independent of sensors and control systems, eliminating the possibility of the grinding depth exceeding the safe threshold due to signal transmission lag.

[0051] When the inner rod shortens, the surface corresponding to the right-angled side is subjected to force, and the direction of the force is perpendicular to the direction of the elastic force of the elastic member. The meshing teeth will not retract into the groove, so that the inner and outer rods always remain relatively fixed. When the inner rod extends, the surface corresponding to the hypotenuse is subjected to force, and the vertical component of the force direction is consistent with the direction of the elastic force of the elastic member. When the extrusion force of the grinding head element on the blade does not exceed the threshold, the vertical component of the force is less than the elastic force of the elastic member, and the inner and outer rods are relatively fixed. When the extrusion force of the grinding head element on the blade exceeds the threshold, the vertical component of the force is greater than the elastic force of the elastic member, and the inner and outer rods move relative to each other.

[0052] The grinding head elements of the recessed grinding assembly and the grinding head elements of the protruding grinding assembly are staggered in the X-axis direction, and a torque compensation assembly is provided on the side of the grinding head element close to the clamping assembly, so that the force values ​​applied by the grinding head elements of the recessed grinding assembly and the grinding head elements of the protruding grinding assembly to the blade are dynamically detected, so that the device has a self-repair function and the grinding quality is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is the first overall diagram of the device;

[0054] Figure 2 This is the second overall diagram of the device;

[0055] Figure 3 A top view of the device;

[0056] Figure 4 This is a structural diagram of the clamping assembly and turbine blades;

[0057] Figure 5 This is the overall structure diagram of the electric push rod;

[0058] Figure 6 This is the exploded view of the electric push rod;

[0059] Figure 7 for Figure 6 Middle AA section;

[0060] Figure 8 Exploded view of the clamping assembly and turbine blades;

[0061] Figure 9 Polish the circuit diagram for the device. DETAILED DESCRIPTION

[0062] The following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0063] like Figure 1-8 As shown, this embodiment provides an aircraft generator assembly maintenance device for local grinding and maintenance of turbine blades 500 of an aircraft ram air turbine generator, including a base 100, a gantry 200 movably mounted above the base 100, a pair of grinding assemblies 300 movably mounted on the inner side of the gantry 200, and a clamping assembly 400 fixedly mounted on the upper end surface of the base 100, the clamping assembly 400 being used to clamp the turbine blades 500.

[0064] It can be understood that when performing local grinding and maintenance on the turbine blade, the gantry 200 can move back and forth along the X-axis direction on the base 100, and the grinding assembly 300 can move back and forth along the Z-axis direction on the columns on both sides of the gantry 200. Therefore, for a certain local area of ​​the turbine blade, the grinding assembly 300 can achieve full coverage of the area by moving in the X-axis and Z-axis directions.

[0065] Specifically, a pair of X-axis rails 110 are mounted above the base 100, each of which is equipped with an X-axis slider 120. Accordingly, the gantry 200 includes a pair of columns 210 and an I-beam 220 fixedly connected to the upper end surfaces of the columns 210. Furthermore, the columns 210 are fixedly mounted to the upper end surfaces of the X-axis sliders 120. This enables reciprocating movement of the gantry 200 and the polishing assembly 300 mounted thereon in the X-axis direction.

[0066] It is worth noting that, in this embodiment, by providing a gantry 200 and an I-beam 220 to fix a pair of columns 210 together, the consistency of movement of the two columns 210 can be ensured, thereby improving the grinding accuracy.

[0067] Furthermore, a Z-axis track 230 is mounted on opposite sides of the pair of columns 210, a Z-axis slider 240 is mounted on each Y-axis track 230, and a pair of grinding assemblies 300 are mounted on the two Z-axis sliders 240. Thus, the grinding assemblies 300 can move back and forth in the Z-axis direction, achieving full coverage of a certain area.

[0068] It is worth noting that the aircraft generator assembly maintenance device of this embodiment can achieve double-sided grinding of the turbine blade 500, thereby improving the grinding efficiency.

[0069] It is understandable that the two surfaces of the turbine blade 500 are curved surfaces, and the pair of grinding assemblies 300 located on both sides of the turbine blade 500 need to maintain contact with the two surfaces of the turbine blade 500 .

[0070] Thus, in this embodiment, the grinding assembly 300 includes an electric push rod 310 and a grinding head element 320. The electric push rod 310 includes a fixed end 330 and an operating end 340. The fixed end 330 is fixedly mounted on the Z-axis slider 240, and the operating end 340 is retractable relative to the fixed end 330. The grinding head element 320 is mounted on the end of the operating end 340 away from the fixed end 330. As a result, the grinding head element 320 can reciprocate in the Y-axis direction, and can be fed in the Y-axis direction as the two curved surfaces of the turbine blade 500 change, thereby maintaining contact between the grinding head element 320 and the turbine blade 500.

[0071] Understandably, see Figure 8Turbine blade 500 includes a fixing portion 510 and a blade 520 fixed to one end of fixing portion 510. Preferably, fixing portion 510 and blade 520 can be integrally formed. Fixing portion 510 has two functions: first, during assembly, it is attached to the rotating shaft of the ram air turbine generator; second, during maintenance, it is fixedly clamped to clamp assembly 400.

[0072] One surface of the blade 520 is inwardly concave, and the other surface is outwardly convex. For ease of description, in this embodiment, the inwardly concave surface of the blade 520 is referred to as the concave surface 521, and the other surface is referred to as the convex surface 522. Accordingly, the grinding assembly 300 on the side of the concave surface 521 is referred to as the concave grinding assembly 3001, and the grinding assembly 300 on the side of the convex surface 522 is referred to as the convex grinding assembly 3002.

[0073] The working process of the aircraft generator assembly maintenance device of this embodiment is as follows:

[0074] First, according to the position where the turbine blade 500 needs to be polished, the polishing assembly 300 is moved to the far edge of the polishing area, that is, the first area, through the X-axis slider 120, and the polishing assembly 300 is moved to the upper edge of the first area (the first point) through the Z-axis slider 240. The grinding head element 320 is respectively contacted with the concave surface 521 and the convex surface 522 through the electric push rod 310, and the grinding head element 320 is started to start polishing the first point.

[0075] Second, after the first point is polished, the grinding head element 320 is stopped; then, the polishing assembly 300 is moved downward to the next point (the second point) through the Z-axis slider 240. At the same time, the concave polishing assembly 3001 is extended and the convex polishing assembly 3002 is shortened, and the polishing head element 320 is respectively contacted with the concave surface 521 and the convex surface 522, and the polishing head element 320 is started to start polishing the second point.

[0076] Third, after the second point is polished, the second step is repeated until the grinding head element 320 polishes the lowest point of the concave surface 521 (which is also the highest point of the convex surface 522, referred to as the third point here).

[0077] Fourth, after the third point is polished, the grinding head element 320 is stopped; then, the polishing assembly 300 is moved downward to the fourth point through the Z-axis slider 240. At the same time, the concave polishing assembly 3001 is shortened and the convex polishing assembly 3002 is extended, and the polishing head element 320 is respectively contacted with the concave surface 521 and the convex surface 522, and the polishing head element 320 is started to start polishing the fourth point.

[0078] Fifth, after the fourth point is polished, the fourth step is repeated until the polishing head element 320 polishes the lower edge of the first area of ​​the blade 520 (the fifth point).

[0079] Sixth, after the fifth point is polished, the grinding head element 320 is stopped; then, the polishing assembly 300 is moved proximally to the second area through the X-axis slider 120, and the polishing head element 320 is respectively contacted with the concave surface 521 and the convex surface 522 through the electric push rod 310, and the polishing head element 320 is started to start polishing the first point of the second area.

[0080] Seventh, repeat steps 2 to 5 above.

[0081] Eighth, after the second area is polished, the polishing head element 320 is stopped; then, the polishing assembly 300 is moved proximally to the third area through the X-axis slider 120, and the polishing head element 320 is brought into contact with the concave surface 521 and the convex surface 522 respectively through the electric push rod 310, and the polishing head element 320 is started to start polishing the first point of the third area.

[0082] Ninth, repeat steps 2 to 6 above until the last point in the last area is polished, thus completing the repair of all polished areas.

[0083] It is understood that the above process can be performed from the distal end to the proximal end of the polishing area, or from the proximal end to the distal end; the polishing of the first area can be performed from the upper end to the lower end, or from the lower end to the upper end. In addition, in the above process, if the area to be polished covers the lowest point of the concave surface 521 (which is also the highest point of the convex surface 522), if the area to be polished does not cover the above points, steps 4 and 5 can be omitted.

[0084] Moreover, when the areas that need to be polished on the concave surface 521 and the convex surface 522 of the blade 520 do not overlap, for a certain non-overlapping point, the grinding head element 320 of the side that needs to be polished is started, and the grinding head element 320 of the side that does not need to be polished is not started; the areas that need to be covered by the grinding head elements 320 of the concave surface 521 and the convex surface 522 on both sides of the blade 520 are based on the maximum boundaries of the two surfaces.

[0085] It can be understood that when the grinding assembly 300 is grinding a certain point, when the recessed grinding assembly 3001 and the protruding grinding assembly 3002 move to the point and contact the point, in order to ensure the grinding quality, the recessed grinding assembly 3001 and the protruding grinding assembly 3002 need to be extended so that the grinding head element 320 can squeeze the point with a certain pressure value.

[0086] However, if the grinding head element 320 applies excessive pressure to that point, the grinding depth at that point will exceed the safety threshold, causing surface damage to the blade 520. The traditional method involves installing a pressure sensor on the grinding head element 320. When the pressure value detected by the pressure sensor reaches the threshold, the pressure signal is fed back to the control system, which then instructs the electric push rod 310 to stop extending. Due to the hysteresis in signal transmission, it is easy for the electric push rod 310 to stop extending when the grinding depth has already exceeded the safety threshold.

[0087] In order to solve the above problems, in this embodiment, the action end 340 includes an inner rod 341 and an outer rod 342. The inner rod 341 can be extended and retracted relative to the fixed end 330. The outer rod 342 is sleeved on the outside of the inner rod 341 and contacts the inner rod 341. The grinding head element 320 is installed on the end of the outer rod 342 away from the fixed end 330.

[0088] Among them, when the inner rod 341 is shortened, the inner rod 341 and the outer rod 342 are relatively fixed; when the inner rod 341 is extended and the extrusion pressure of the grinding head element 320 on the blade 520 does not exceed the threshold, the inner rod 341 and the outer rod 342 are relatively fixed; when the inner rod 341 is extended and the extrusion pressure of the grinding head element 320 on the blade 520 exceeds the threshold, the inner rod 341 and the outer rod 342 move relative to each other.

[0089] Therefore, when the recessed grinding assembly 3001 and the protruding grinding assembly 3002 are grinding a certain point, and the extrusion pressure of the grinding head element 320 on the blade 520 does not exceed the threshold value, the inner rod 341 and the outer rod 342 are relatively fixed, so that the inner rod 341 can drive the outer rod 342 to move toward the blade 520, so that the grinding head element 320 further squeezes the blade 520; when the extrusion pressure of the grinding head element 320 on the blade 520 exceeds the threshold value, the inner rod 341 and the outer rod 342 move relative to each other, so that the inner rod 341 cannot drive the outer rod 342 to continue to move toward the blade 520, so that the grinding head element 320 automatically stops squeezing the blade 520.

[0090] In this embodiment of the aircraft generator assembly maintenance device, when the compressive force of the grinding head element 320 on the blade 520 exceeds a threshold, the grinding head element 320 automatically stops compressing the blade 520, preventing the grinding depth from exceeding a safe threshold and causing surface damage to the blade 520. Furthermore, since it does not rely on sensors or control systems, it eliminates the possibility of the grinding depth exceeding the safe threshold due to signal transmission lag.

[0091] Specifically, the end of the inner rod 341 is an arcuate region 343, which is formed by a curved surface and a flat surface. The outer rod 342 is provided with a through hole 344, and the shape of the through hole 344 matches the shape of the arcuate region 343, thereby limiting the outer rod 342 to only one degree of sliding freedom relative to the inner rod 341. The arcuate region 343 is equipped with an active structure 350, and the through hole 344 is equipped with a passive structure (not shown in the figure), and the active structure 350 is in contact with the passive structure.

[0092] When the active structure 350 is engaged with the driven structure, the inner rod 341 and the outer rod 342 are relatively fixed; when the active structure 350 is disengaged from the driven structure, the inner rod 341 and the outer rod 342 move relative to each other. Thus, the inner rod 341 and the outer rod 342 can switch between being relatively fixed or moving relative to each other.

[0093] Furthermore, the active structure 350 includes a groove 351 and a sliding plate 352 that can be raised and lowered inside the groove 351. The groove 351 is opened on the plane of the arc area 343, and the upper end surface of the sliding plate 352 is fixedly installed with a plurality of linear arrays of meshing teeth 353; correspondingly, the driven structure is a plurality of linear arrays of meshing grooves 354 opened on the upper end surface of the through hole 344, and the shape of the meshing grooves 354 matches the meshing teeth 353.

[0094] An elastic member 355 is provided between the upper end surface of the groove 351 and the lower end surface of the sliding plate 352 , and the elastic coefficient of the elastic member 355 matches the extrusion force threshold of the grinding head element 320 on the blade 520 .

[0095] Therefore, when the squeezing force of the grinding head element 320 on the blade 520 does not exceed the threshold value, the elastic force of the elastic member 355 is greater than the squeezing force, and the meshing teeth 353 remain in an extended state, so that the inner rod 341 and the outer rod 342 are relatively fixed; when the squeezing force of the grinding head element 320 on the blade 520 exceeds the threshold value, the elastic member 355 is compressed, and the meshing teeth 353 disengage from the meshing 354 and enter the next meshing 354, so that the inner rod 341 and the outer rod 342 move relative to each other.

[0096] Furthermore, the cross section of the meshing tooth 353 is a right triangle, and the surface 356 corresponding to the right angle side is away from the grinding head element 320 , and the surface 357 corresponding to the hypotenuse is close to the grinding head element 320 .

[0097] As a result, when the inner rod 341 shortens, the surface 356 corresponding to the right-angled side is subjected to force, and the direction of the force is perpendicular to the direction of the elastic force of the elastic member 355. The meshing teeth 353 will not retract into the groove 351, so that the inner rod 341 and the outer rod 342 always remain relatively fixed. When the inner rod 341 extends, the surface 357 corresponding to the hypotenuse is subjected to force, and the vertical component of the force direction is consistent with the direction of the elastic force of the elastic member 355. At this time, if the extrusion force of the grinding head element 320 on the blade 520 does not exceed the threshold, the vertical component of the force is less than the elastic force of the elastic member 355, and the inner rod 341 and the outer rod 342 are relatively fixed. If the extrusion force of the grinding head element 320 on the blade 520 exceeds the threshold, the vertical component of the force is greater than the elastic force of the elastic member 355, and the inner rod 341 and the outer rod 342 move relative to each other.

[0098] It can be understood that a distance sensor (not shown) is provided on the sliding plate 352. When the distance sensor detects that the distance between the sliding plate 352 and the bottom wall of the groove 351 is shortened, the inner rod 341 is stopped from being driven to extend. Although the feedback signal of the distance sensor may be delayed, the outer rod 342 has automatically stopped feeding, and the squeezing force of the grinding head element 320 on the blade 520 will not exceed the threshold.

[0099] Furthermore, the working process of the aircraft generator assembly maintenance device of this embodiment is as follows:

[0100] After the grinding assembly 300 moves to a certain point, before the grinding head element 320 is started, the grinding head element 320 of the recessed grinding assembly 3001 and the grinding head element 320 of the protruding grinding assembly 3002 are close to and squeeze the blade 520. When the distance sensor detects the height change of the sliding plate 352, it can stop driving the inner rod 341 to extend, and then start the grinding head element 320 to start grinding the point.

[0101] Therefore, for the grinding of a certain point, the recessed grinding component 3001 and the protruding grinding component 3002 are extended so that the grinding head element 320 squeezes the point with a certain pressure value. When the squeezing force of the grinding head element 320 on the blade 520 exceeds the threshold, the inner rod 341 cannot drive the outer rod 342 to continue to move toward the blade 520, so that the grinding head element 320 automatically stops squeezing the blade 520, avoiding the grinding depth exceeding the safety threshold and causing surface damage to the blade 520, and eliminating the grinding depth exceeding the safety threshold due to the lag of signal transmission.

[0102] It can be understood that the elastic coefficient of the elastic part 355 needs to match the extrusion pressure threshold of the grinding head element 320 on the blade 520. Corresponding to different working conditions (such as when grinding different models of blades 520 or when the grinding requirements of the two surfaces of the blade 520 are different, etc.), the elastic coefficient of the elastic part 355 needs to be adjusted.

[0103] Therefore, preferably, the elastic member 355 of this embodiment is an actively controlled spring (not shown) so that the spring constant of the elastic member 355 can be adjusted according to different working conditions. The actively controlled spring can be an electromagnetic spring or magnetorheological elastomer, etc., as known in the art. Any active spring that can adjust the spring constant of the elastic member 355 according to the extrusion pressure threshold falls within the scope of protection of the present invention.

[0104] However, if there is an error in the elastic coefficient configuration of the elastic member 355 , the extrusion force of the grinding head element 320 on the blade 520 may fail to reach or exceed the threshold, thereby causing insufficient or excessive grinding depth, affecting the repair quality of the blade 520 .

[0105] To this end, in this embodiment, the grinding head elements 320 of the recessed grinding assembly 3001 and the grinding head elements 320 of the protruding grinding assembly 3002 are arranged alternately in the X-axis direction, and a torque compensation assembly 410 is provided on the side of the grinding head elements 320 close to the clamping assembly 400, and the torque compensation assembly 410 is in contact with the turbine blade 500;

[0106] The torque applied by the grinding head element 320 of the concave grinding assembly 3001 and the grinding head element 320 of the protruding grinding assembly 3002 to the blade 520 and the torque applied by the torque compensation assembly 410 to the blade 520 are kept balanced.

[0107] See Figure 3 In this embodiment, the grinding head element 320 of the recessed grinding assembly 3001 is relatively close to the clamping assembly 400, that is, the recessed grinding assembly 3001 is a proximal grinding assembly, and the protruding grinding assembly 3002 is a distal grinding assembly. It is understood that the recessed grinding assembly 3001 can also be a distal grinding assembly and the protruding grinding assembly 3002 can be a proximal grinding assembly.

[0108] Therefore, due to the different distances between the lever arms, the forces exerted on the blade 520 by the grinding head element 320 of the recessed grinding assembly 3001 and the grinding head element 320 of the protruding grinding assembly 3002 are unbalanced. Based on the forces exerted on the blade 520 by the grinding head element 320 of the recessed grinding assembly 3001 and the grinding head element 320 of the protruding grinding assembly 3002 and the changes in the lever arms between the two, a certain force is applied to the blade 520 by the torque compensation assembly 410, so that the blade 520 reaches a dynamic equilibrium state. That is, at a certain point, the torque compensation assembly 410 applies a preset force to the blade 520, so that the blade 520 reaches a balanced state.

[0109] It will be appreciated that the torque compensation assembly 410 is also subject to the compressive force of the blade 520. In this embodiment, the torque compensation assembly 410 is equipped with a pressure sensor to detect the force applied to the torque compensation assembly 410. If the pressure sensor detects that the force applied to the torque compensation assembly 410 deviates from a preset value, this indicates that there is a discrepancy between the force applied by the grinding head element 320 of the recessed grinding assembly 3001 and the grinding head element 320 of the protruding grinding assembly 3002 to the blade 520. In this case, the aircraft generator assembly maintenance device should be stopped and the elastic modulus of the elastic member 355 should be reconfigured.

[0110] In the aircraft generator assembly maintenance device of this embodiment, the grinding head elements 320 of the recessed grinding assembly 3001 and the grinding head elements 320 of the protruding grinding assembly 3002 are staggered in the X-axis direction, and a torque compensation assembly 410 is provided on the side of the grinding head elements 320 close to the clamping assembly 400, thereby dynamically detecting the force values ​​applied by the grinding head elements 320 of the recessed grinding assembly 3001 and the grinding head elements 320 of the protruding grinding assembly 3002 on the blade 520, thereby improving accuracy.

[0111] Specifically, a biasing plate 360 ​​is fixedly mounted on one end of the outer rod 342 close to the grinding head element 320 , and the biasing plate 360 ​​protrudes from the outer rod 342 in the X-axis direction. The grinding head element 320 is mounted on the biasing plate 360 ​​and is located on one side of the outer rod 342 .

[0112] Furthermore, the fixing portion 510 is configured in a rectangular shape, and a clamping groove 420 is formed on the side of the clamping assembly 400. The height of the clamping groove 420 is the same as that of the fixing portion 510, and the width of the clamping groove 420 is slightly larger than that of the fixing portion 510.

[0113] A mounting groove 430 is defined on one side wall of the clamping groove 420 , and the mounting groove 430 and the proximal recessed grinding assembly 3001 are located on the same side of the blade 520 . The torque compensation assembly 410 is mounted in the mounting groove 430 .

[0114] Thus, when the clamping assembly 400 clamps the fixing portion 510, one end surface of the fixing portion 510 abuts against the sidewall of the clamping groove 420 that is not provided with the mounting groove 430, while the other end surface contacts the torque compensation assembly 410, and the torque compensation assembly 410 extends out of the mounting groove 430. In other words, the other end surface and the sidewall of the clamping groove 420 that is provided with the mounting groove 430 have a clearance fit, allowing the torque compensation assembly 410 to accurately sense the applied force.

[0115] It can be understood that the torque compensation component 410 can adopt an intelligent push rod or an intelligent jack, etc. Any torque compensation component 410 that can tighten the telescopic end 510, adjust the tightening force, and detect the pressure value of 510 on the telescopic end falls within the protection scope of the present invention.

[0116] Furthermore, the working process of the aircraft generator assembly maintenance device of this embodiment is as follows:

[0117] For the grinding of each point in the grinding area, the elastic coefficient of the elastic member 355 is configured according to the threshold value of the extrusion force of the grinding head element 320 on the blade 520, and the force value applied by the torque compensation component 410 to the blade 520 is pre-configured, so that the torque applied by the grinding head element 320 of the recessed grinding component 3001 and the grinding head element 320 of the protruding grinding component 3002 on the blade 520, as well as the torque applied by the torque compensation component 410 to the blade 520 reach a balanced state.

[0118] When the pressure sensor of the torque compensation assembly 410 detects that the force applied to the torque compensation assembly 410 deviates from the preset force value, the operation of the aircraft generator assembly maintenance device is stopped and the elastic coefficient of the elastic member 355 is reconfigured.

[0119] Thus, the force values ​​applied by the grinding head element 320 of the recessed grinding assembly 3001 and the grinding head element 320 of the protruding grinding assembly 3002 to the blade 520 are dynamically detected to prevent the extrusion force of the grinding head element 320 on the blade 520 from deviating from the threshold value, resulting in insufficient or excessive grinding depth.

[0120] Combined with attachment Figure 9 As shown, this embodiment also provides an aircraft generator assembly maintenance method, comprising the following steps:

[0121] S1. According to the position of the turbine blade 500 to be polished, the polishing area is evenly divided into n areas along the X-axis direction, and the i-th area is evenly divided into m areas along the Z-axis direction. i points, where i = 1, 2, ..., n;

[0122] S2. Move the grinding assembly 300 to the first area at the far end via the X-axis slider 120, and move the grinding assembly 300 to the first point S at the upper edge of the first area via the Z-axis slider 240. 11 , the grinding head element 320 is brought into contact with the concave surface 521 and the convex surface 522 respectively by the electric push rod 310, and the grinding head element 320 is started to start grinding S 11 Point;

[0123] S3, S 11 After the point grinding is completed, the grinding head element 320 is stopped; then, the grinding assembly 300 is moved downward to S by the Z-axis slider 240. 12 At the same time, the concave grinding component 3001 is extended and the convex grinding component 3002 is shortened, and the grinding head element 320 is respectively in contact with the concave surface 521 and the convex surface 522, and the grinding head element 320 is started to start grinding S12 Point;

[0124] S4, S 12 After the point grinding is completed, the second step is repeated until the grinding head element 320 grinds the lowest point of the concave surface 521 (which is also the highest point of the convex surface 522, i.e. point); where j1 = 1, 2, ..., m1;

[0125] S5, After the point grinding is completed, the grinding head element 320 is stopped; then, the grinding assembly 300 is moved downward by the Z-axis slider 240. At the same time, the concave grinding component 3001 is shortened and the convex grinding component 3002 is extended, and the grinding head element 320 is respectively in contact with the concave surface 521 and the convex surface 522, and the grinding head element 320 is started to start grinding. Point;

[0126] S6, After the point grinding is completed, the above S5 is repeated until the grinding head element 320 grinds the blade 520. Point;

[0127] S7, After the point grinding is completed, the grinding head element 320 is stopped; then, the grinding assembly 300 is moved proximally to the second area through the X-axis slider 120, and the grinding head element 320 is brought into contact with the concave surface 521 and the convex surface 522 respectively through the electric push rod 310, and the grinding head element 320 is started to start grinding S 21 Point;

[0128] S8, repeat the above steps S3 to S6;

[0129] S9, After the point grinding is completed, the grinding head element 320 is stopped; then, the grinding assembly 300 is moved proximally to the third area by the X-axis slider 120, and the grinding head element 320 is brought into contact with the concave surface 521 and the convex surface 522 respectively by the electric push rod 310, and the grinding head element 320 is started to start grinding S 31 Point;

[0130] S10, repeat the above steps S3 to S8, polishing in sequence Points, until the last point After grinding, the repair of all grinding areas is completed; i =1, 2, ..., m i .

[0131] Furthermore, before step S1, the process further includes step S0, For point grinding, the elastic coefficient of the elastic member 355 is configured according to the threshold of the extrusion force of the grinding head element 320 on the blade 520;

[0132] Among them, in the steps S2 to S10, before the grinding head element 320 is started, the grinding head element 320 of the concave grinding assembly 3001 and the grinding head element 320 of the convex grinding assembly 3002 are close to and squeeze the blade 520. When the distance sensor detects the height change of the sliding plate 352, the driving of the inner rod 341 to extend is stopped, and then the grinding head element 320 is started to start grinding. Point.

[0133] Furthermore, before step S1, the process further includes step S0, During point grinding, the force applied by the torque compensation assembly 410 to the blade 520 is pre-configured based on the threshold of the extrusion force of the grinding head element 320 on the blade 520, so that the torques applied by the grinding head element 320 of the concave grinding assembly 3001 and the grinding head element 320 of the convex grinding assembly 3002 on the blade 520, as well as the torque applied by the torque compensation assembly 410 on the blade 520, reach a balanced state.

[0134] In steps S2 to S10 , when the pressure sensor of the torque compensation assembly 410 detects that the force applied to the torque compensation assembly 410 deviates from the preset force value, the operation of the aircraft generator assembly maintenance device is stopped and the elastic coefficient of the elastic member 355 is reconfigured.

[0135] The foregoing is an example of the best mode of carrying out the present invention. Any portion not described in detail herein is common knowledge within the skill of one of ordinary skill in the art. The scope of protection of the present invention is determined by the claims. Any equivalent transformation based on the technical teachings of the present invention is also within the scope of protection of the present invention.

Claims

1. An aircraft generator assembly maintenance device, comprising: base; A gantry is movably mounted above the base; The grinding assembly is configured as a pair and is installed on the inner side of the gantry so as to be movable up and down; A clamping assembly, fixedly mounted on the upper end surface of the base, for clamping the turbine blades; It is characterized in that a pair of X-axis rails are installed above the base, and an X-axis slider is installed on each X-axis rail; The gantry includes a pair of columns and an I-beam fixedly connected to the upper end surfaces of the pair of columns, and the pair of columns are fixedly installed on the upper end surfaces of a pair of X-axis sliders; A Z-axis track is installed on the opposite side of a pair of columns, a Z-axis slider is installed on each Z-axis track, and a pair of grinding assemblies are installed on the two Z-axis sliders respectively; The grinding assembly includes an electric push rod and a grinding head element. The electric push rod includes a fixed end and an action end. The fixed end is fixedly mounted on the Z-axis slider, and the action end can be extended and retracted relative to the fixed end. The grinding head element is mounted on the end of the action end away from the fixed end. The turbine blade includes a fixed portion and a blade fixedly arranged at one end of the fixed portion, and the fixed portion is fixedly clamped in the clamping assembly. The side of the leaf that is concave inward is the concave side, and the other side is the convex side; The grinding assembly on the concave surface side is a concave grinding assembly, and the grinding assembly on the convex surface side is a convex grinding assembly; the action end includes an inner rod and an outer rod, the inner rod can be extended and retracted relative to the fixed end, the outer rod is sleeved on the outside of the inner rod and contacts the inner rod, and the grinding head element is installed at the end of the outer rod away from the fixed end; When the inner rod is shortened, the inner rod and the outer rod are relatively fixed; when the inner rod is extended and the extrusion force of the grinding head element on the blade does not exceed a threshold value, the inner rod and the outer rod are relatively fixed; when the inner rod is extended and the extrusion force of the grinding head element on the blade exceeds a threshold value, the inner rod and the outer rod move relative to each other; the end of the inner rod is an arc-shaped area, and the arc-shaped area is surrounded by an arc surface and a plane, and the outer rod is provided with a through hole, and the shape of the through hole matches the arc-shaped area; The arc-shaped area is provided with an active structure, and the through hole is provided with a driven structure, and the active structure is in contact with the driven structure; When the active structure and the driven structure are engaged, the inner rod and the outer rod are relatively fixed; when the active structure and the driven structure are disengaged, the inner rod and the outer rod move relatively.

2. The device according to claim 1, characterized in that The active structure includes a groove and a sliding plate arranged inside the groove and capable of being raised and lowered. The groove is opened on the plane of the arc-shaped area, and a plurality of linear array meshing teeth are fixedly mounted on the upper end surface of the sliding plate. The driven structure is a plurality of linear array meshing grooves provided on the upper end surface of the through hole, and the shape of the meshing grooves matches the meshing teeth; Wherein, an elastic member is provided between the upper end surface of the groove and the lower end surface of the sliding plate, and the elastic coefficient of the elastic member matches the extrusion force threshold of the grinding head element on the blade; Furthermore, a distance sensor is arranged on the sliding plate.

3. The device according to claim 1, characterized in that The grinding head elements of the concave grinding assembly and the grinding head elements of the convex grinding assembly are staggered in the X-axis direction, and a torque compensation assembly is provided on the side of the grinding head element close to the clamping assembly, and the torque compensation assembly is in contact with the turbine blade; The torques applied by the grinding head elements of the recessed grinding assembly and the grinding head elements of the protruding grinding assembly to the blades and the torque applied by the torque compensation assembly to the blades are kept balanced.

4. The device according to claim 3, characterized in that The fixing part is configured in a rectangular body, and a clamping groove is opened on the side of the clamping component. The height of the clamping groove is the same as that of the fixing part, and the width of the clamping groove is slightly larger than the width of the fixing part; A mounting groove is provided on one side wall of the clamping groove, and the mounting groove and the proximal recessed grinding assembly are located on the same side of the blade, and the torque compensation assembly is installed in the mounting groove.

5. A method for repairing an aircraft generator assembly, using the device according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: S1. According to the position of the turbine blade to be polished, the polishing area is evenly divided into n areas along the X axis, and the i-th area is evenly divided into m areas along the Z axis. i points, where i = 1, 2, ..., n; S2. Move the grinding assembly to the first area at the far end through the X-axis slider, and move the grinding assembly to the first point S at the upper edge of the first area through the Z-axis slider. 11 , use the electric push rod to make the grinding head element contact with the concave surface and the convex surface respectively, start the grinding head element to start grinding S 11 Point; S3, S 11 After the point grinding is completed, stop the grinding head component; then, move the grinding component down to S through the Z-axis slider. 12 At the same time, the concave grinding component extends and the convex grinding component shortens, and the grinding head element contacts the concave surface and the convex surface respectively, and the grinding head element starts to grind S 12 Point; S4, S 12 After the point grinding is completed, S3 is repeated until the grinding head element grinds the lowest point of the concave surface; wherein j1 = 1, 2, ..., m1; S5, After the point grinding is completed, stop the grinding head component; then, move the grinding component downward through the Z-axis slider. At the same time, the concave grinding component shortens and the convex grinding component lengthens, and the grinding head element contacts the concave surface and the convex surface respectively, and the grinding head element starts grinding. Point; S6, After the point grinding is completed, repeat the above S5 until the grinding head element grinds the blade. Point; S7, After the point grinding is completed, stop the grinding head element; then, move the grinding assembly to the proximal end to the second area through the X-axis slider, and use the electric push rod to make the grinding head element contact the concave surface and the convex surface respectively, and start the grinding head element to start grinding S 21 Point; S8, repeat S3 to S6 above; S9, After the point grinding is completed, stop the grinding head element; then, move the grinding assembly to the proximal end to the third area through the X-axis slider, and use the electric push rod to make the grinding head element contact the concave surface and the convex surface respectively, and start the grinding head element to start grinding S 31 Point; S10, repeat the above S3 to 8, polishing in sequence Points, until the last point After grinding, the repair of all grinding areas is completed; i =1, 2, ..., m i .

6. The method according to claim 5, characterized in that Before S1, it also includes S0, For point grinding, the elastic coefficient of the elastic element is configured according to the threshold of the extrusion force of the grinding head element on the blade; Among them, in said S2~10, before the grinding head element is started, the grinding head element of the concave grinding assembly and the grinding head element of the convex grinding assembly are close to and squeeze the blade, and when the distance sensor detects the height change of the sliding plate, the driving of the inner rod extension is stopped, and then the grinding head element is started to start grinding Point.

7. The method according to claim 6, characterized in that Before S1, it also includes S0, For point grinding, the force value applied by the torque compensation component to the blade is pre-configured according to the threshold of the extrusion force of the grinding head element on the blade, so that the torque applied by the grinding head element of the concave grinding component and the grinding head element of the convex grinding component on the blade, as well as the torque applied by the torque compensation component on the blade, reach a balanced state; Among them, in said S2-10, when the pressure sensor of the torque compensation assembly detects that the force applied to the torque compensation assembly deviates from the preset force value, the operation of the aircraft generator assembly maintenance device is stopped and the elastic coefficient of the elastic member is reconfigured.

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