An adjustable fixture for CNC machining of rotor blades of manned helicopters

Abstract

This invention discloses an adjustable fixture for CNC machining of rotor blades of manned helicopters, relating to the field of machine tool fixture technology. It includes a positioning frame and a mounting plate. The edge of the mounting plate has a detection station and a machining station corresponding to two adjacent sets of blades. The detection station has a shape measurement mechanism, and the machining station has a clamping machining mechanism. The shape measurement mechanism, combined with a laser ranging probe, measures the shape of a standard blade. The clamping machining mechanism includes support cylinders distributed on the machining station, positioned below the blade at the machining station corresponding to the laser ranging probe. A machining motor is mounted above the blade at the machining station. The laser ranging probe measures the shape of the standard blade, the support cylinders in the clamping machining mechanism support and position the blade to be machined, and the machining motor, combined with the machining of the upper surface of the blade, achieves overall blade machining in conjunction with an attitude adjustment mechanism.

Description

Technical Field

[0001] This invention relates to the field of machine tool fixture technology, specifically an adjustable fixture for CNC machining of rotor blades of manned helicopters. Background Technology

[0002] Rotor blades are key components of helicopter-type rotorcraft. Through high-speed rotation and interaction with the air, they generate upward lift and forward thrust, enabling flight. As the blades rotate, the airflow speeds on their upper and lower surfaces differ. According to Bernoulli's principle, the airflow speed is higher and the pressure is lower on the upper surface, while the airflow speed is lower and the pressure is higher on the lower surface, creating a pressure difference that generates lift. Furthermore, by changing the blade pitch, the magnitude and direction of lift can be controlled, allowing for changes in the aircraft's flight attitude, such as ascent, descent, forward movement, backward movement, and turning.

[0003] During helicopter rotor blade manufacturing, it is essential to ensure the consistency of the blade shape to guarantee that each blade generates the same lift during rotation, thereby ensuring the helicopter's handling stability. However, the repeated disassembly and reassembly of fixtures during the manufacturing process of existing rotor blades can easily lead to positioning errors, affecting the machining accuracy of the blade shape and the consistency of the blade shapes among them. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable fixture for CNC machining of rotor blades of manned helicopters, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An adjustable fixture for CNC machining of rotor blades of a manned helicopter includes a positioning frame and blades evenly spaced around the circumference of the positioning frame. The blades are rotatably mounted on a mounting plate in conjunction with the positioning frame. The edge of the mounting plate is provided with a detection station and a machining station for two adjacent sets of blades, respectively. The detection station is provided with a shape measuring mechanism, and the machining station is provided with a clamping machining mechanism.

[0007] The shape measuring mechanism includes laser ranging probes distributed on the upper and lower sides of the blade. The clamping and processing mechanism includes support cylinders distributed on the processing station. The support cylinders are distributed below the blade at the processing station, corresponding to the laser ranging probes. A processing motor is installed above the blade at the processing station, and the height of the processing motor is the same as the detection height of the laser ranging probe above the blade at the detection station. The shape measuring mechanism and the clamping and processing mechanism are provided with end clamping components at the blade end. An attitude adjustment mechanism is provided between the blade and the mounting plate.

[0008] As a further embodiment of the present invention: the shape measuring mechanism includes a mounting frame disposed on the edge of the mounting plate, the mounting frame being symmetrically disposed on the upper and lower sides of the blade, the upper and lower sides of the mounting frame being fixedly connected at the ends away from the mounting plate, a drive screw being disposed within the upper and lower sides of the mounting frame, a translation frame being mounted on the drive screw, the translation frame being slidably mounted between the translation frame and the mounting frame, and the laser ranging probe being evenly disposed on the side of the translation frame facing the blade.

[0009] As a further embodiment of the present invention: a positioning plate is provided between the mounting frame and the blade, and multiple sets of detection holes are evenly distributed on the positioning plate, with the laser ranging probe corresponding to each other.

[0010] As a further embodiment of the present invention: the clamping processing mechanism includes a mounting frame disposed at the processing station, the mounting frame being fixedly connected to the edge of the mounting plate, an upper frame being fixedly disposed on the upper side of the mounting frame, support cylinders being evenly disposed on the mounting frame corresponding to the detection holes, a second drive screw being disposed on the upper frame, a second translation frame being fitted on the second drive screw, the second translation frame being slidably mounted to the upper frame, a lateral adjustment screw being disposed at the bottom of the second translation frame, a telescopic motor being fitted on the lateral adjustment screw, and a processing motor being connected to the telescopic motor.

[0011] As a further embodiment of the present invention: the end clamping assembly includes two sets of vertically fixed mounting slides, a connecting slide block is mounted on the mounting slide, a telescopic cylinder is horizontally mounted on the connecting slide block, the telescopic cylinder is connected to a clamping frame, a clamping cylinder is provided in the clamping frame, and a telescopic cylinder is vertically mounted on the upper side of the connecting slide block.

[0012] As a further embodiment of the present invention: the upper mounting frame is provided with an extension frame, the lower side of the extension frame is provided with a support column one, the upper side of the mounting plate is provided with an annular support groove, the bottom of the support column one cooperates with the annular support groove, and the edge of the upper frame is provided with a support column two, the support column two cooperates with the annular support groove.

[0013] As a further embodiment of the present invention: the attitude adjustment mechanism includes a clamping block, the end of the blade is fixedly installed between the clamping block and the blade, the clamping block is rotatably installed between the clamping block and the arc frame, the bottom of the arc frame is provided with a mating ball, the blade, together with the arc frame and the mating ball, is slidably engaged with the upper side of the mounting plate, the upper side of the arc frame is provided with a positioning pin, the positioning frame and the arc frame are fixedly installed by the positioning pin, the clamping block is provided with a mating bevel gear on the inner side of the arc frame, a bevel gear disk is rotatably installed in the mounting plate, the mating bevel gear and the bevel gear disk mesh with each other, and the bevel gear disk is connected to an adjustment motor.

[0014] As a further embodiment of the present invention: a rotation mechanism is connected between the blades, the rotation mechanism including a rotation motor mounted on an extension frame, the rotation motor being connected to a mating shaft, a drive gear being slidably mounted on the mating shaft, a mating frame being provided on the upper side of the drive gear, a lifting cylinder being provided on the extension frame at the central axis of the mounting plate, a cross being connected to the end of the lifting cylinder, an annular frame being slidably mounted on the inner ring of the positioning frame, a mating post being provided on the outer ring of the annular frame, the mating post being inserted into the inner ring of the positioning frame, an annular groove being provided on the annular frame, the bottom of the cross being slidably engaged with the annular groove, an internal gear ring being provided on the upper side of the positioning frame, the drive gear meshing with the internal gear ring, a linkage frame being provided between the lifting cylinder and the mating frame, a butt joint being provided at the bottom center of the annular frame, a mating groove being provided at the center of the bevel gear disk, and the butt joint being vertically engaged with the mating groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] (1) Combine the shape data obtained by the laser ranging probe and send it to the clamping processing mechanism at the processing station. Use the support cylinder in the clamping processing mechanism to combine the height data of each point obtained by the laser ranging probe to achieve precise support and positioning of the bottom of the blade. Use the processing motor installed on the upper side of the blade to pass through each detection point in sequence and linearly adjust the height of the processing head between each point to achieve the blade contour processing.

[0017] (2) After the standard blade completes data acquisition, the standard blade rotates together with the blade to be processed, and the blades are processed in sequence. After all the blades to be processed are processed, the standard blade returns to the inspection station, and the angle of the standard blade is adjusted by the attitude adjustment mechanism. Then the shape measurement of the standard blade is repeated, and the blade is further processed by the clamping processing mechanism until the blade is processed as a whole.

[0018] (3) The first drive screw is installed by setting up an installation frame. The first drive screw drives the first translation frame to move back and forth. The laser ranging probe on the first translation frame measures the distance on the surface of the standard blade. The blade data obtained at the detection station is transmitted to the processing station. The blade is then positioned, clamped, and processed by the clamping processing mechanism. By setting a positioning plate to fix the ranging interval, the ranging point position can be fixed before and after the attitude adjustment mechanism adjusts the blade attitude.

[0019] (4) Control all blades to rotate through the indexing mechanism, rotate the unprocessed blades to the processing station, and repeat the surface processing of the previous blade. When indexing is required, control the cross to fall with the lifting cylinder so that the joint and the mating groove on the bevel gear disk are connected. At the same time as the cross falls, the linkage frame and the mating frame control the drive gear to move down and mesh with the internal gear ring. When the indexing motor drives the drive gear to rotate, it will drive the positioning frame and the bevel gear disk to rotate synchronously, and drive the circumferentially evenly installed blades to rotate together, so as to avoid the bevel gear disk and the mating bevel gear from meshing during the blade indexing process, and ensure that the blade posture does not change during the blade indexing process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the external shape measuring mechanism in this invention.

[0022] Figure 3 This is a schematic diagram of the clamping processing mechanism in this invention.

[0023] Figure 4 This is a schematic diagram of the end clamping assembly in this invention.

[0024] Figure 5 This is a schematic diagram of the blade installation in this invention.

[0025] Figure 6 This is a schematic diagram of the connection structure between the rotation mechanism and the mounting plate in this invention.

[0026] Figure 7 This is a schematic diagram of the installation structure of the clamping block in this invention.

[0027] Figure 8 This is a schematic diagram of the rotation mechanism in this invention.

[0028] In the diagram: 2. Mounting plate; 20. Positioning frame; 21. Annular support groove; 3. External measurement mechanism; 30. Mounting frame; 31. Positioning plate; 310. Detection hole; 32. Translation frame one; 33. Drive screw one; 34. Laser rangefinder probe; 35. End clamping assembly; 350. Clamping frame; 351. Clamping cylinder; 352. Mounting slide; 353. Connecting slider; 354. Telescopic cylinder one; 355. Telescopic cylinder two; 36. Extension frame; 37. Support column one; 4. Clamping processing mechanism; 40. Mounting frame; 41. Support cylinder; 42. Upper frame; 43. Drive screw 44. Shifting Frame 2; 45. Lateral Adjusting Screw; 47. Telescopic Motor; 48. Machining Motor; 49. Support Column 2; 5. Indexing Mechanism; 50. Internal Gear Ring; 51. Indexing Motor; 52. Mating Shaft; 53. Drive Gear; 54. Mating Frame; 55. Linkage Frame; 56. Lifting Cylinder; 58. Cross; 59. Ring Frame; 510. Annular Groove; 511. Mating Column; 512. Connecting Joint; 6. Blade; 60. Clamping Block; 61. Arc Frame; 62. Mating Bevel Gear; 63. Bevel Gear Disc; 64. Adjusting Motor; 65. Positioning Pin; 66. Mating Ball. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0030] like Figure 1 As shown, an adjustable fixture for CNC machining of rotor blades of a manned helicopter includes a positioning frame 20 and blades 6 distributed at equal angular intervals around the positioning frame 20. The blades 6 are rotatably mounted on a mounting plate 2 in conjunction with the positioning frame 20. The edge of the mounting plate 2 is provided with a detection station and a processing station corresponding to two adjacent sets of blades 6, respectively. The detection station is provided with a shape measuring mechanism 3, and the processing station is provided with a clamping processing mechanism 4.

[0031] like Figure 1 , Figure 2 As shown, the shape measuring mechanism 3 includes laser ranging probes 34 distributed on the upper and lower sides of the blade 6, and the clamping processing mechanism 4 includes support cylinders 41 distributed on the processing station. The support cylinders 41 are distributed below the blade 6 at the processing station, corresponding to the laser ranging probes 34. A processing motor 48 is installed above the blade 6 at the processing station. The height of the processing motor 48 is the same as the detection height of the laser ranging probes 34 above the blade 6 at the detection station. The shape measuring mechanism 3 and the clamping processing mechanism 4 are provided with end clamping components 35 at the end of the blade 6. An attitude adjustment mechanism is provided between the blade 6 and the mounting plate 2.

[0032] Specifically, the blades 6 to be processed are evenly spaced and installed around the circumference of the mounting plate 2. First, the standard blades 6 are installed at the inspection station, and the shape measurement mechanism 3 at the inspection station is used to inspect the shape of the blade surface 6. The shape data obtained by the laser rangefinder 34 is sent to the clamping and processing mechanism 4 at the processing station. Using the support cylinder 41 in the clamping and processing mechanism 4 and the height data of each point detected by the laser rangefinder 34, the bottom of the blade 6 is accurately supported and positioned. The processing motor 48, which is installed on the upper side of the blade 6, passes through each inspection point in sequence and linearly adjusts the height of the processing head between each point to achieve the contour processing of the blade 6.

[0033] More specifically, after the standard blade 6 completes data acquisition, the standard blade 6 rotates together with the blades 6 to be processed, and the blades 6 are processed sequentially. After all the blades 6 to be processed are processed, the standard blade 6 returns to the inspection station, and the angle of the standard blade 6 is adjusted in conjunction with the attitude adjustment mechanism. Then, the shape measurement of the standard blade 6 is repeated, and the blade 6 is further profiled in conjunction with the clamping processing mechanism 4 until the blade 6 is processed as a whole.

[0034] More specifically, in combination Figure 2 , Figure 3 , Figure 6 As shown, the attitude adjustment mechanism includes a bevel gear disk 63 rotatably mounted in the mounting plate 2. The bevel gear disk 63 is rotated by the adjustment motor 64, which in turn drives the mating bevel gear 62 that meshes with the edge of the bevel gear disk 63 to rotate. The mating bevel gear 62, together with the clamping block 60, clamps the blade 6. The bevel gear disk 63 synchronously drives the rotationally symmetrically distributed blades 6 to rotate, thereby synchronously adjusting the attitude of all blades 6. This facilitates multi-angle shape measurement of the standard blade 6 at the inspection station and multi-angle shape machining of the blade 6 at the machining station, improving the machining accuracy and machinable angle of the blade 6, and further reducing the number of times the blade 6 is disassembled and assembled.

[0035] Furthermore, such as Figure 1 , Figure 2 As shown, the shape measuring mechanism 3 includes a mounting frame 30 disposed on the edge of the mounting plate 2. The mounting frame 30 is symmetrically disposed on the upper and lower sides of the blade 6. The upper and lower mounting frames 30 are fixedly connected at the ends away from the mounting plate 2. A drive screw 33 is disposed inside the upper and lower mounting frames 30. A translation frame 32 is mounted on the drive screw 33. The translation frame 32 is slidably mounted between the translation frame 30 and the mounting frame 30. The laser ranging probe 34 is evenly disposed on the side of the translation frame 32 facing the blade 6.

[0036] Furthermore, such as Figure 2As shown, a positioning plate 31 is provided between the mounting frame 30 and the blade 6. Multiple sets of detection holes 310 are evenly distributed on the positioning plate 31, and the laser ranging probe 34 corresponds to the detection holes 310.

[0037] Specifically, the installation frame 30 is used to install the drive screw 33, which in turn drives the translation frame 32 to move back and forth. The laser ranging probe 34 on the translation frame 32 measures the distance to the surface of the standard blade 6. The data from the blade 6 detected at the inspection station is transmitted to the processing station, where the clamping mechanism 4 positions and clamps the blade 6 for processing. The positioning plate 31 fixes the ranging interval, ensuring the ranging point remains fixed before and after the attitude adjustment mechanism adjusts the attitude of the blade 6.

[0038] Furthermore, such as Figure 1 , Figure 3 As shown, the clamping processing mechanism 4 includes a mounting frame 40 set at the processing station. The mounting frame 40 is fixedly connected to the edge of the mounting plate 2. An upper frame 42 is fixedly set on the upper side of the mounting frame 40. Support cylinders 41 are evenly arranged on the mounting frame 40 corresponding to the detection holes 310. A second drive screw 43 is set on the upper frame 42. A second translation frame 44 is installed on the second drive screw 43. The second translation frame 44 is slidably installed between the second translation frame 44 and the upper frame 42. A lateral adjustment screw 45 is set at the bottom of the second translation frame 44. A telescopic motor 47 is installed on the lateral adjustment screw 45. The telescopic motor 47 is connected to a processing motor 48.

[0039] Specifically, the bottom of the blade 6 to be processed is supported and positioned by evenly arranged support cylinders 41. Each set of support cylinders 41 corresponds to the distance of the standard blade 6 measured by laser ranging at the corresponding point. The extension length of the support cylinder 41 is equal to the measured distance data. The processing motor 48 located on the upper side moves back and forth by driving the screw 43. Combined with the distance measurement data of the standard blade 6 above the shape measuring mechanism 3, the processing motor 48 adjusts the height of the corresponding distance measurement point in sequence during the processing, thereby realizing the surface processing of the blade 6 to be processed.

[0040] Furthermore, such as Figure 4 As shown, the end clamping assembly 35 includes two sets of vertically fixed mounting slides 352. A connecting slider 353 is mounted on the mounting slides 352. A telescopic cylinder 354 is horizontally mounted on the connecting slider 353. The telescopic cylinder 354 is connected to a clamping frame 350. A clamping cylinder 351 is provided inside the clamping frame 350. A telescopic cylinder 355 is vertically mounted on the upper side of the connecting slider 353.

[0041] Specifically, to prevent the blade 6 from drooping due to its own weight, the end clamping assembly 35 clamps and fixes the blade 6, ensuring that the blade 6 maintains a consistent posture at both the inspection and processing stations, while also ensuring reliable fixation of the blade 6 during processing. The clamping frame 350 and clamping cylinder 351 clamp and fix the blade 6, while the telescopic cylinders 354 and 355, in conjunction with the posture adjustment mechanism, dynamically adjust and position the blade 6 according to its posture.

[0042] Furthermore, such as Figure 2 , Figure 3 , Figure 5 As shown, the upper mounting frame 30 is provided with an extension frame 36, and a support column 37 is provided on the lower side of the extension frame 36. An annular support groove 21 is provided on the upper side of the mounting plate 2. The bottom of the support column 37 and the annular support groove 21 cooperate with each other. A second support column 49 is provided on the edge of the upper frame 42. The second support column 49 and the annular support groove 21 cooperate with each other.

[0043] Specifically, in order to ensure the stability of the shape measuring mechanism 3 and the clamping processing mechanism 4 during the rotation processing of the blade 6, the upper mounting frame 30 and the upper frame 42 are supported and positioned by the first support column 37 and the second support column 49, respectively, to ensure the stable installation of the laser ranging probe 34 and the processing motor 48.

[0044] Furthermore, such as Figure 6 , Figure 7 As shown, the attitude adjustment mechanism includes a clamping block 60. The end of the blade 6 is fixedly installed between the clamping block 60 and the blade 6. The clamping block 60 is rotatably installed between the clamping block 60 and the arc frame 61. The bottom of the arc frame 61 is provided with a mating ball 66. The blade 6, together with the arc frame 61 and the mating ball 66, is slidably engaged on the upper side of the mounting plate 2. The upper side of the arc frame 61 is provided with a positioning pin 65. The positioning frame 20 is fixedly installed with the arc frame 61 through the positioning pin 65. The clamping block 60 is located inside the arc frame 61 and is provided with a mating bevel gear 62. A bevel gear disk 63 is rotatably installed inside the mounting plate 2. The mating bevel gear 62 and the bevel gear disk 63 mesh with each other. The bevel gear disk 63 is connected to an adjustment motor 64.

[0045] Specifically, since the surface of blade 6 is irregularly shaped and the edges and back of blade 6 cannot be machined in one go, the angle of blade 6 needs to be adjusted multiple times to complete the processing of blade 6. The synchronous attitude control of all blades 6 is achieved by bevel gear disk 63 and cooperating bevel gear 62. After the attitude of blade 6 is adjusted, the shape is measured again and the surface is processed in conjunction with clamping processing mechanism 4.

[0046] Furthermore, such as Figure 5 , Figure 8 As shown, a rotation mechanism 5 is connected between the blades 6. The rotation mechanism 5 includes a rotation motor 51 mounted on the extension frame 36. The rotation motor 51 is connected to a mating shaft 52. A drive gear 53 is slidably mounted on the mating shaft 52. A mating frame 54 is provided on the upper side of the drive gear 53. A lifting cylinder 56 is provided on the extension frame 36 at the central axis of the mounting plate 2. A cross 58 is connected to the end of the lifting cylinder 56. A ring frame 59 is slidably mounted on the inner ring of the positioning frame 20. A mating post 51 is provided on the outer ring of the ring frame 59. 1. The mating column 511 is inserted into the inner ring of the positioning frame 20. The annular frame 59 is provided with an annular groove 510. The bottom of the cross 58 is slidably engaged with the annular groove 510. An internal gear ring 50 is provided on the upper side of the positioning frame 20. The drive gear 53 meshes with the internal gear ring 50. A linkage frame 55 is provided between the lifting cylinder 56 and the mating frame 54. A connecting joint 512 is provided at the bottom center of the annular frame 59. A mating groove is provided at the center of the bevel gear disk 63. The connecting joint 512 and the mating groove are connected for lifting and lowering.

[0047] Specifically, after the surface processing of the blade 6 at the machining station is completed, the rotation of all blades 6 is controlled by the indexing mechanism 5 to rotate the unprocessed blades 6 to the machining station, repeating the surface processing of the previous blade 6. When indexing is required, the lifting cylinder 56 controls the cross 58 to fall, so that the mating joint 512 and the mating groove on the bevel gear disk 63 are engaged. At the same time as the cross 58 falls, the linkage frame 55, in conjunction with the mating frame 54, controls the drive gear 53 to move down and mesh with the internal gear ring 50. When the indexing motor 51 drives the drive gear 53 to rotate, it will drive the positioning frame 20 and the bevel gear disk 63 to rotate synchronously, and drive the circumferentially evenly installed blades 6 to rotate together, avoiding meshing between the bevel gear disk 63 and the mating bevel gear 62 during the indexing of the blades 6, ensuring that the posture of the blades 6 does not change during the indexing process.

[0048] The working principle of this invention embodiment is as follows:

[0049] like Figures 1-8As shown, the blades 6 to be processed are evenly spaced and installed around the circumference of the mounting plate 2. First, the standard blade 6 is installed at the inspection station, and the shape measurement mechanism 3 at the inspection station inspects the shape of the blade 6 surface. The shape data obtained by the laser rangefinder 34 is sent to the clamping and processing mechanism 4 at the processing station. Using the support cylinder 41 in the clamping and processing mechanism 4, combined with the height data of each point detected by the laser rangefinder 34, the bottom of the blade 6 is accurately supported and positioned. The processing motor 48, which is mounted on the upper side of the blade 6, moves sequentially through each inspection point and linearly adjusts the height of the processing head between each point to achieve the contour processing of the blade 6. After the standard blade 6 completes data acquisition, the standard blade 6 rotates together with the blades 6 to be processed, and the blades 6 are processed sequentially. After all the blades 6 to be processed are processed, the standard blade 6 returns to the inspection station, and the angle of the standard blade 6 is adjusted by the attitude adjustment mechanism. Then, the shape measurement of the standard blade 6 is repeated, and the blade 6 is further contour processed by the clamping and processing mechanism 4 until the entire blade 6 is processed. The installation frame 30 is used to install the drive screw 33, which in turn drives the translation frame 32 to move back and forth. The laser ranging probe 34 on the translation frame 32 measures the distance to the surface of the standard blade 6. The data from the blade 6 detected at the inspection station is transmitted to the processing station, where the clamping mechanism 4 positions and clamps the blade 6 for processing. The positioning plate 31 fixes the ranging interval, ensuring the ranging point remains fixed before and after the attitude adjustment mechanism adjusts the blade 6's attitude. After the blade 6 at the processing station completes surface processing, the indexing mechanism 5 controls the rotation of all blades 6, rotating the unprocessed blade 6 to the processing station for repeated surface processing. When rotation is required, the lifting cylinder 56 controls the cross 58 to fall, so that the mating groove on the connector 512 and the bevel gear disk 63 are engaged. At the same time as the cross 58 falls, the linkage frame 55, in conjunction with the mating frame 54, controls the drive gear 53 to move down and mesh with the internal gear ring 50. When the rotation motor 51 drives the drive gear 53 to rotate, it will drive the positioning frame 20 and the bevel gear disk 63 to rotate synchronously, and drive the circumferentially evenly installed blades 6 to rotate together. This avoids meshing between the bevel gear disk 63 and the mating bevel gear 62 during the rotation of the blades 6, ensuring that the posture of the blades 6 does not change during the rotation of the blades 6.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An adjustable fixture for CNC machining of rotor blades of a manned helicopter, comprising a positioning frame (20) and blades (6) evenly spaced around the circumference of the positioning frame (20), wherein the blades (6) are rotatably mounted on a mounting plate (2) in conjunction with the positioning frame (20), characterized in that, The edge of the mounting plate (2) is provided with a detection station and a processing station for the two adjacent sets of blades (6). The detection station is provided with a shape measuring mechanism (3), and the processing station is provided with a clamping processing mechanism (4). The shape measuring mechanism (3) includes laser ranging probes (34) distributed on the upper and lower sides of the blade (6). The clamping processing mechanism (4) includes support cylinders (41) distributed on the processing station. The support cylinders (41) are distributed below the blade (6) of the processing station corresponding to the laser ranging probes (34). A processing motor (48) is installed above the blade (6) of the processing station. The height of the processing motor (48) is the same as the detection height of the laser ranging probe (34) above the blade (6) of the detection station. The shape measuring mechanism (3) and the clamping processing mechanism (4) are provided with end clamping components (35) at the end of the blade (6). An attitude adjustment mechanism is provided between the blade (6) and the mounting plate (2). The shape measuring mechanism (3) includes a mounting frame (30) set on the edge of the mounting plate (2). The mounting frame (30) is symmetrically set on the upper and lower sides of the blade (6). The upper and lower mounting frames (30) are fixedly connected at the ends away from the mounting plate (2). A drive screw (33) is set in the upper and lower mounting frames (30). A translation frame (32) is installed on the drive screw (33). The translation frame (32) is slidably installed between the translation frame (30) and the mounting frame (30). The laser ranging probe (34) is evenly set on the side of the translation frame (32) facing the blade (6). A positioning plate (31) is provided between the mounting frame (30) and the blade (6). Multiple sets of detection holes (310) are evenly distributed on the positioning plate (31), and the laser ranging probe (34) corresponds to the detection holes (310). The clamping processing mechanism (4) includes a mounting frame (40) set at the processing station. The mounting frame (40) is fixedly connected to the edge of the mounting plate (2). An upper frame (42) is fixedly set on the upper side of the mounting frame (40). Support cylinders (41) are evenly arranged on the mounting frame (40) corresponding to the detection hole (310). A second drive screw (43) is set on the upper frame (42). A second translation frame (44) is installed on the second drive screw (43). The second translation frame (44) is slidably installed between the second translation frame (44) and the upper frame (42). A horizontal adjustment screw (45) is set at the bottom of the second translation frame (44). A telescopic motor (47) is installed on the horizontal adjustment screw (45). The telescopic motor (47) is connected to a processing motor (48).

2. The adjustable fixture for CNC machining of rotor blades of a manned helicopter according to claim 1, characterized in that, The end clamping assembly (35) includes two sets of vertically fixed mounting slides (352), a connecting slider (353) is mounted on the mounting slides (352), a telescopic cylinder (354) is horizontally mounted on the connecting slider (353), the telescopic cylinder (354) is connected to a clamping frame (350), a clamping cylinder (351) is provided inside the clamping frame (350), and a telescopic cylinder (355) is vertically mounted on the upper side of the connecting slider (353).

3. The adjustable fixture for CNC machining of rotor blades of a manned helicopter according to claim 1, characterized in that, The upper mounting frame (30) is provided with an extension frame (36), and a support column (37) is provided on the lower side of the extension frame (36). An annular support groove (21) is provided on the upper side of the mounting plate (2). The bottom of the support column (37) and the annular support groove (21) cooperate with each other. A support column (49) is provided on the edge of the upper frame (42), and the support column (49) and the annular support groove (21) cooperate with each other.

4. The adjustable fixture for CNC machining of rotor blades of a manned helicopter according to claim 3, characterized in that, The attitude adjustment mechanism includes a clamping block (60), the end of the blade (6) is fixedly installed between the clamping block (60), the clamping block (60) is rotatably installed between the arc frame (61), the bottom of the arc frame (61) is provided with a mating ball (66), the blade (6) is slidably engaged with the arc frame (61) and the mating ball (66) on the upper side of the mounting plate (2), the upper side of the arc frame (61) is provided with a positioning pin (65), the positioning frame (20) is fixedly installed with the arc frame (61) by the positioning pin (65), the clamping block (60) is located inside the arc frame (61) and is provided with a mating bevel gear (62), a bevel gear disk (63) is rotatably installed inside the mounting plate (2), the mating bevel gear (62) and the bevel gear disk (63) mesh with each other, and the bevel gear disk (63) is connected to an adjustment motor (64).

5. The adjustable fixture for CNC machining of rotor blades of a manned helicopter according to claim 4, characterized in that, A rotation mechanism (5) is connected between the blades (6). The rotation mechanism (5) includes a rotation motor (51) mounted on the extension frame (36). The rotation motor (51) is connected to a mating shaft (52). A drive gear (53) is slidably mounted on the mating shaft (52). A mating frame (54) is provided on the upper side of the drive gear (53). A lifting cylinder (56) is provided on the extension frame (36) at the central axis of the mounting plate (2). A cross (58) is connected to the end of the lifting cylinder (56). A ring frame (59) is slidably mounted on the inner ring of the positioning frame (20). A mating column (54) is provided on the outer ring of the ring frame (59). 11) The mating column (511) is inserted into the inner ring of the positioning frame (20). The annular frame (59) is provided with an annular groove (510). The bottom of the cross (58) is slidably engaged with the annular groove (510). An internal gear ring (50) is provided on the upper side of the positioning frame (20). The drive gear (53) meshes with the internal gear ring (50). A linkage frame (55) is provided between the lifting cylinder (56) and the mating frame (54). A connecting joint (512) is provided at the bottom center of the annular frame (59). A mating groove is provided at the center of the bevel gear disk (63). The connecting joint (512) and the mating groove are connected in a lifting manner.

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