Helicopter transmission system coaxiality detection and adjustment device and method

Abstract

The invention provides a helicopter transmission system coaxiality detection and adjustment device and method, the device comprises a main controller 10, a laser emitter 20 and a laser receiver CCD 30, the main controller 10 comprises a computer 11 and a control box 12, after a control instruction on the computer 11 is sent, the control instruction is directly transmitted to the control box 12 through a USB interface; the laser transmitter 20 comprises a first laser transmitter 21 and a second laser transmitter 22, the first laser transmitter 21 comprises a first laser transmitter 211, a first adjusting flange 212 and a positioning cylinder 213, and the second laser transmitter 22 comprises a second laser transmitter 221, a second adjusting flange 222 and a positioning cylinder 223; the laser transmitter 20 is installed on a simulation output shaft flange plate of an engine or a main speed reducer, and the positioning cylinder 223 and the output end of the engine or the main speed reducer are installed in a positioning fit mode.

Description

Technical Field

[0001] The invention belongs to the field of tooling fixture design and relates to a coaxiality detection and adjustment device and method for a helicopter transmission system. Background Art

[0002] During the manufacturing, use and maintenance of helicopters, since the transmission shaft in the helicopter transmission system is very long and requires multiple bearing support seats, accurately measuring the coaxiality of these bearing support seats is a very important task that is directly related to the flight safety of the helicopter.

[0003] At present, in the manufacture and daily repair and maintenance of helicopters, the manufacturing and repair tasks are generally completed according to the transmission shaft detection and measurement process provided in the technical manual. However, the traditional measurement method is to use telescope shooting and other methods, that is, to visually observe the center of the bearing support seats at both ends through a telescope, use a template to measure the middle bearing seat respectively, and use manual interpretation to give the measurement results. Due to the error of manual interpretation, the measurement results are directly affected. Therefore, the traditional measurement method cannot fully meet the daily repair and maintenance needs of helicopters. Summary of the invention

[0004] The present application provides a device and method for detecting and adjusting the coaxiality of a helicopter transmission system, which can solve the problem of not being able to fully meet the daily repair and maintenance needs of the helicopter.

[0005] In a first aspect, the present application provides a helicopter transmission system coaxiality detection and adjustment device, including a main controller 10, a laser transmitter 20, and a laser receiver CCD 30, wherein:

[0006] The main controller 10 includes a computer 11 and a control box 12. After the control instruction on the computer 11 is issued, the control instruction is directly transmitted to the control box 12 through the USB interface;

[0007] The laser emitter 20 includes a laser emitter Ⅰ 21 and a laser emitter Ⅱ 22. The laser emitter Ⅰ 21 includes a first laser emitter 211, a first adjustment flange 212 and a positioning cylinder 213. The laser emitter Ⅱ 22 includes a second laser emitter 221, a second adjustment flange 222 and a positioning cylinder 223. The laser emitter 20 is installed on the flange of the simulated output shaft of the engine or the main reducer, and the positioning cylinder 223 is installed in a positioning and matching manner with the output end of the engine or the main reducer.

[0008] The laser receiver CCD30 includes a laser receiver No. Ⅰ 31 and a laser receiver No. Ⅱ 32, wherein the laser receiver No. Ⅰ 31 includes a first laser receiver 311 and a mounting dummy 312, and the laser receiver No. Ⅱ 32 includes a second laser receiver 321 and an adjustment flange 322; the laser receiver CCD30 is installed on the bearing support of the middle reducer, tail reducer or tail transmission shaft to be detected, and the coaxiality accuracy of the optical axis of the photoelectric receiving sensor and the measuring axis is ensured by a self-calibration platform and a fixture;

[0009] The computer 11 is connected to the control box 12 via a data line; the computer 11 is connected to the laser receiver CCD30 via a receiver connection line; the control box 12 is connected to the laser transmitter 20 via a transmitter connection line;

[0010] Specifically, the error signal on the laser receiver CCD30 is converted into an electrical signal through photoelectric conversion, processed by the circuit part and image acquisition, and then transmitted to the computer 11. The electrical signal is processed, and the final coaxiality deviation result is the deviation value of the energy center of the light spot from the coordinate center, including distance error and angle error.

[0011] Specifically, the laser receiver CCD30 receives the laser beam signal emitted by the laser transmitter 20; when there is no coaxiality error between the point to be detected and the laser beam measurement reference line, the laser beam spot is hit on the coordinate center of the photoelectric detector coordinate system of the laser receiver CCD30; when there is an error, the laser beam signal with error information will be irradiated on the non-coordinate center of the photoelectric sensor coordinate system.

[0012] Specifically, the laser emitter 20 is installed so that the optical axis of the laser beam emitted by the laser emitter 20 is consistent with the transmission center of the output shaft installed thereon. The laser beam emitted by the laser emitter 20 serves as a main reducer output axis and is regarded as a measurement reference line.

[0013] Specifically, the central wavelength of the laser emitter 20 is (670±10) nm, power is 250 mW, operating voltage is 2.5 V, and operating current is 30 mA. Since the Gaussian beam emitted by the semiconductor laser has a certain beam divergence angle, and for the measurement result, the smaller the beam divergence angle, the better, a secondary lens transformation is adopted. The first lens transformation is used to compress the waist radius of the Gaussian beam, so a short focal length focusing lens is often used, and the second lens transformation uses a larger focal length transformation lens to reduce the divergence angle of the Gaussian beam.

[0014] Specifically, the resolution of the laser receiver CCD30 is: 752 (H) × 582 (V); frame rate: 50,125f / s; pixel size: 8.6μm (H) × 8.3μm (V); sensitivity: 0.1lx; shutter speed: 1 / 50~1 / 10000s. Since the size of the laser beam focus spot directly affects the measurement accuracy in the interpretation measurement, a focusing lens is designed. At the same time, a mechanical sliding lens system is made according to the measurement needs to realize the position change of the CCD array relative to the focus of the movable lens group. Since the laser beam has strong energy, an attenuation plate is superimposed in front of the lens to prevent the CCD from saturation or even burning. At the same time, it also suppresses the background light from entering the CCD, making the image easy to process.

[0015] Specifically, the computer 11 is connected to the control box 12 via a data cable; the computer 11 is connected to the laser receiver CCD30 via a receiver connecting cable, one end of the connecting cable is a four-core aviation plug connected to the laser receiver CCD30, and the other end is connected to the USB interface of the computer 11; the control box 12 is connected to the laser transmitter 20 via a transmitter connecting cable, both ends of the connecting cable are three-core aviation plugs; the external power supply uses 220V AC, and is directly connected to the main controller 10 via the AC power connecting cable.

[0016] In a second aspect, the present application provides a method for detecting and adjusting the coaxiality of a helicopter transmission system, the method comprising:

[0017] Step 1: The No. II laser receiver 32 is connected to the input flange of the main reducer through screw end faces;

[0018] Step 2: Install the engine simulation component at the engine installation position;

[0019] Step 3: The No. II laser transmitter 22 is screwed into the engine output end flange, wherein the transmitter beam outlet faces the receiver; the engine output end flange is installed in conjunction with the engine simulation part through the positioning cylinder 223; after installation, the No. II laser transmitter 22 is started, and the output light spot is located at the center of the main reduction connection end of the engine simulation part by turning the knob on the second adjustment flange 222;

[0020] Step 4: Start the main controller 10: Enter the measurement control program in the computer 11.

[0021] Step 5: Start the laser transmitter II 22, and then manually rotate the engine output flange at a constant speed;

[0022] Step 6: After the engine output end flange starts to rotate, the measurement control program in the computer 11 is run, and the engine output end flange stops rotating after rotating one circle;

[0023] Step 7: Rotate the laser receiver II 32 by 180° and repeat step 6;

[0024] Step 8: Wait for the measurement control program to give the coaxiality deviation result and the engine position adjustment amount;

[0025] Step 9: Turn off the No. II laser transmitter 22 and remove the coaxiality detection and adjustment device of the helicopter transmission system;

[0026] Step 10: Detect the coaxiality of the engine-main reducer of the helicopter transmission system according to the distance error and the angle error, and adjust the engine-main reducer of the helicopter transmission system according to the engine position adjustment amount.

[0027] Specifically, step 8 includes:

[0028] Step 81: Calculate the distance error using the formula Δyreal=cosα·Δy;

[0029] Step 82: Calculate the angle error using the formula α=arctanΔy′ / f′;

[0030] Step 83: Obtain the engine position adjustment amount by running the measurement control program of the computer (11).

[0031] In summary, the present invention provides a coaxiality detection and adjustment device and method for a helicopter transmission system, which utilizes the characteristics of good monochromaticity, strong directionality and high brightness of laser, takes the laser beam emitted by the laser as the measurement reference line, receives it by the laser receiver CCD, passes through the image acquisition card and is processed by the computer to give the actual detection result, thereby realizing the accurate detection of the coaxiality of the traditional system. This method improves the stability and reliability of the detection, the detection system uses computer technology digital image processing technology, adopts machine plus visual interpretation, the detection result is objective, and the detection accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of a helicopter transmission system coaxiality detection and adjustment device of the present invention;

[0033] Figure 2 It is a schematic diagram of laser transmitter No. Ⅰ of the present invention;

[0034] Figure 3 It is a schematic diagram of laser transmitter No. II of the present invention;

[0035] Figure 4 is a schematic diagram of laser receiver No. Ⅰ of the present invention;

[0036] Figure 5 is a schematic diagram of laser receiver No. II of the present invention;

[0037] Figure 6 It is a schematic diagram of the laser error measurement principle of the present invention;

[0038] Figure 7a It is a schematic diagram of distance deviation of the laser measurement optical principle of the present invention;

[0039] Figure 7b It is a schematic diagram of angle deviation of the laser measurement optical principle of the present invention;

[0040] Figure 8 The present invention is a flow chart of a method for detecting and adjusting the coaxiality of a helicopter transmission system.

[0041] Among them, 10-main controller, 20-laser transmitter, 30-laser receiver CCD, 11-computer, 12-control box, 21-laser transmitter No. I, 22-laser transmitter No. II, 31-laser receiver No. I, 32-laser receiver No. II. DETAILED DESCRIPTION

[0042] Purpose of the invention: The invention relates to a helicopter transmission system coaxiality detection and adjustment device and method. The stability and reliability of helicopter transmission system coaxiality detection are improved, and computer technology digital image processing technology is used, and machine plus visual interpretation is adopted, so that the detection result is objective and the detection accuracy is high.

[0043] Embodiment 1

[0044] like Figure 1-Figure 5 As shown, the present invention provides a helicopter transmission system coaxiality laser alignment detection and adjustment device, including a main controller 10, a laser transmitter 20, and a laser receiver CCD30, wherein:

[0045] The main controller 10 includes a computer 11 and a control box 12. After the control instruction on the computer 11 is issued, the control instruction is directly transmitted to the control box 12 through the USB interface;

[0046] The laser emitter 20 includes a laser emitter Ⅰ 21 and a laser emitter Ⅱ 22. The laser emitter Ⅰ 21 includes a first laser emitter 211, a first adjustment flange 212 and a positioning cylinder 213. The laser emitter Ⅱ 22 includes a second laser emitter 221, a second adjustment flange 222 and a positioning cylinder 223. The laser emitter 20 is installed on the flange of the simulated output shaft of the engine or the main reducer, and the positioning cylinder 223 is installed in a positioning and matching manner with the output end of the engine or the main reducer.

[0047] The laser receiver CCD30 includes a laser receiver No. Ⅰ 31 and a laser receiver No. Ⅱ 32, wherein the laser receiver No. Ⅰ 31 includes a first laser receiver 311 and a mounting dummy 312, and the laser receiver No. Ⅱ 32 includes a second laser receiver 321 and an adjustment flange 322; the laser receiver CCD30 is installed on the bearing support of the mid-tail reducer or tail transmission shaft to be detected, and the coaxiality accuracy of the optical axis of the photoelectric receiving sensor and the measuring axis is also ensured by a self-calibration platform and a fixture;

[0048] The computer 11 is connected to the control box 12 via a data cable; the computer 11 is connected to the laser receiver CCD30 via a receiver connection cable, one end of the connection cable is a four-core aviation plug connected to the laser receiver CCD30, and the other end is connected to the computer 11 USB interface; the control box 12 is connected to the laser transmitter 20 via a transmitter connection cable, both ends of the connection cable are three-core aviation plugs; the external power supply uses 220V AC, and is directly connected to the main controller 10 via the AC power connection cable;

[0049] Furthermore, when the laser emitter 20 is installed, the optical axis of the laser beam emitted by the laser emitter 20 is consistent with the transmission center of the output shaft installed thereon, so that the laser beam emitted by the laser emitter 20 can be used as a main reducer output axis and regarded as a measurement reference line.

[0050] Furthermore, the laser receiver CCD30 receives the laser beam signal emitted by the laser transmitter 20; Figure 6 As shown in the figure, when there is no coaxiality error between the point to be detected and the laser beam measurement reference line, the laser beam spot hits the coordinate center of the laser receiver CCD30 photoelectric detector exactly; when there is an error, the laser beam signal with error information will be irradiated at the non-coordinate center of the photoelectric sensor coordinate system.

[0051] It should be noted that the computer 11 is the control center of the entire system. All control instructions of the measurement process are issued through this device, and it also serves as a display window for the measurement results. The computer 11 includes a computer system, a measurement control program in the computer, accessories, etc. The embodiment of the present application does not specifically limit the computer 11.

[0052] It should be noted that the control box 12 provides power signals for other supporting equipment on the one hand, and also completes the control of the next-level terminal equipment under the control of the computer 11 instructions, such as data collection received by the laser receiver 30 on the other hand.

[0053] Furthermore, the error signal on the laser receiver CCD30 is converted into an electrical signal through photoelectric conversion, processed by the circuit part and image acquisition, and then transmitted to the computer 11. The electrical signal is processed, and the final coaxial deviation result is the deviation value of the energy center of the light spot from the coordinate center, including distance error and angle error.

[0054] Furthermore, the central wavelength of the laser emitter 20 is (670±10) nm, power is 250 mW, operating voltage is 2.5 V, and operating current is 30 mA. Since the Gaussian beam emitted by the semiconductor laser has a certain beam divergence angle, and for the measurement result, the smaller the beam divergence angle, the better, a secondary lens transformation is adopted. The first lens transformation is used to compress the waist radius of the Gaussian beam, so a short focal length focusing lens is often used, and the second lens transformation uses a larger focal length transformation lens to reduce the divergence angle of the Gaussian beam.

[0055] Furthermore, the resolution of the laser receiver CCD30 is: 752 (H) × 582 (V); frame rate: 50,125f / s; pixel size: 8.6μm (H) × 8.3μm (V); sensitivity: 0.1lx; shutter speed: 1 / 50~1 / 10000s. Since the size of the laser beam focus spot directly affects the measurement accuracy in the interpretation measurement, a focusing lens is designed. At the same time, a mechanical sliding lens system is made according to the measurement needs to realize the position change of the CCD array relative to the focus of the movable lens group. Since the laser beam has strong energy, an attenuation plate is superimposed in front of the lens to prevent the CCD from saturation or even burning, and at the same time, the background light is suppressed from entering the CCD, making the image easy to process.

[0056] Furthermore, the computer 11 is connected to the control box 12 via a data cable; the computer 11 is connected to the laser receiver CCD30 via a receiver connecting cable, one end of the connecting cable is a four-core aviation plug connected to the laser receiver CCD30, and the other end is connected to the computer 11 USB interface; the control box 12 is connected to the laser transmitter 20 via a transmitter connecting cable, both ends of the connecting cable are three-core aviation plugs; the external power supply uses 220V AC, and is directly connected to the main controller 10 via the AC power connecting cable.

[0057] It should be noted that the obtained coaxiality deviation result is displayed on the computer 11 in both image and digital forms for use by inspection personnel.

[0058] In summary, the present invention provides a device and method for detecting and adjusting the coaxiality of a helicopter transmission system, which solves the problems of low accuracy, misjudgment and poor stability caused by the traditional method of using a telescope to shoot. After field use, the present invention has improved the stability and reliability of the coaxiality detection of the traditional system. The detection system uses computer technology digital image processing technology and machine plus visual interpretation. The detection results are objective and the detection accuracy is high, which can be promoted for use in different models.

[0059] Embodiment 2

[0060] As shown in FIGS. 7-8 , the embodiment of the present application takes the engine-main reducer as an example to illustrate a method for detecting and adjusting the coaxiality of a helicopter transmission system, and the method includes:

[0061] Step 1: The No. II laser receiver 32 is connected to the main reducer input flange through screw end faces.

[0062] Step 2: Install the engine simulation component at the engine installation position.

[0063] Step 3, screw the No. II laser transmitter 22 into the engine output flange, wherein the transmitter beam outlet faces the receiver; the engine output flange is installed in conjunction with the engine simulation component through the positioning cylinder 223; after installation, start the No. II laser transmitter 22, and adjust the output light spot near the center of the main reduction connection end of the engine simulation component by turning the knob on the second adjustment flange 222.

[0064] Step 4: start the main controller 10 and enter the measurement control program in the computer 11.

[0065] Step 5, start the laser transmitter II 22, and then manually rotate the engine output flange at a constant speed;

[0066] The rotation speed is controlled within a range of 1-1.5 revolutions per minute.

[0067] Step 6: After the engine output end flange starts to rotate, the measurement control program in the computer 11 is run, and the engine output end flange stops rotating after rotating one circle.

[0068] Step 7: Rotate the laser receiver II 32 by 180° and repeat step 6.

[0069] Step 8: Wait for the measurement control program to give the coaxiality deviation result and the engine position adjustment amount.

[0070] Specifically, step 8 includes:

[0071] Step 81: Calculate the distance error using the formula Δyreal=cosα·Δy;

[0072] Step 82: Calculate the angle error using the formula α=arctanΔy′ / f′;

[0073] Step 83: Obtain the engine position adjustment amount by running the measurement control program of the computer (11).

[0074] It should be noted that, for the calibration of the coordinate center point, the image point on the CCD array where the laser beam passes through the principal optical axis of the receiving objective lens is selected as the coordinate center point.

[0075] It should be noted that, as shown in Figure 7(a), the distance error Δy is calculated by the formula Δy=Δy′·f′ / d. Where d is the distance between the CCD array and the focus of the receiving objective lens; f′ is the focal length of the receiving objective lens; Δy′ is the image error. When calculating the coaxiality error, it is necessary to introduce angle error correction. This is because the lens surface of the CCD and the laser beam are not necessarily orthogonal, as shown in Figure 7(b). Therefore, in order to make the measurement result accurate, correction is required. The distance error correction formula is: Δyrea l=cosα·Δy. Where α is the angle between the main optical axis of the receiving objective lens and the horizontal line; Δy is the calculated coaxiality error.

[0076] It should be noted that the angle between the main optical axis of the receiving objective lens and the horizontal line is measured by placing the CCD array at the focal length of the receiving objective lens, as shown in Figure 7(b), and measuring the distance Δy′ from the image to the coordinate center point, thereby calculating the angle α. The angle error calculation formula is: α =

[0077] arctanΔy′ / f′. Where f is the focal length of the lens group.

[0078] Step 9: Turn off the No. II laser transmitter 22 and remove the measuring equipment.

[0079] Step 10: Detect the coaxiality of the engine-main reducer of the helicopter transmission system according to the distance error and the angle error, and adjust the engine-main reducer of the helicopter transmission system according to the engine position adjustment amount.

[0080] In summary, the present invention provides a set of coaxiality detection devices and methods based on laser collimation, which utilize the characteristics of laser monochromaticity, strong directionality and high brightness, and use the laser beam emitted by the laser as the measurement reference line. After being received by the laser receiver CCD, it is processed by the computer after passing through the image acquisition card to give the actual detection result, thereby realizing the accurate detection of the coaxiality of the traditional system. This method improves the stability and reliability of the detection. The detection system uses computer technology digital image processing technology, adopts machine plus visual interpretation, and the detection results are objective and the detection accuracy is high.

Claims

1. A helicopter transmission system coaxiality detection and adjustment device, characterized in that: It comprises a main controller (10), a laser transmitter (20), and a laser receiver CCD (30), wherein: The main controller (10) comprises a computer (11) and a control box (12); after a control instruction is issued on the computer (11), the control instruction is directly transmitted to the control box (12) via a USB interface; The laser emitter (20) comprises a No. I laser emitter (21) and a No. II laser emitter (22); the No. I laser emitter (21) comprises a first laser emitter (211), a first adjustment flange (212) and a positioning cylinder (213); the No. II laser emitter (22) comprises a second laser emitter (221), a second adjustment flange (222) and a positioning cylinder (223); the laser emitter (20) is mounted on a flange plate of a simulated output shaft of an engine or a main reducer, and the positioning cylinder (223) is mounted in a positioning and matching manner with an output end of the engine or the main reducer; The laser receiver CCD (30) comprises a No. Ⅰ laser receiver (31) and a No. Ⅱ laser receiver (32), wherein the No. Ⅰ laser receiver (31) comprises a first laser receiver (311) and a mounting dummy (312), and the No. Ⅱ laser receiver (32) comprises a second laser receiver (321) and an adjustment flange (322); the laser receiver CCD (30) is mounted on a bearing support of a middle reducer, a tail reducer or a tail transmission shaft to be inspected, and the coaxiality accuracy of the optical axis of the photoelectric receiving sensor and the measuring axis is ensured by a self-calibration platform and a fixture; The computer (11) is connected to the control box (12) via a data line; the computer (11) is connected to a laser receiver CCD (30) via a receiver connection line; and the control box (12) is connected to a laser transmitter (20) via a transmitter connection line.

2. The helicopter transmission system coaxiality detection and adjustment device according to claim 1, characterized in that: The error signal on the laser receiver CCD (30) is converted into an electrical signal through photoelectric conversion, processed by the circuit part, image acquisition, and then transmitted to the computer (11). The electrical signal is processed and the coaxiality deviation result finally obtained is the deviation value of the energy center of the light spot from the coordinate center, including distance error and angle error.

3. The helicopter transmission system coaxiality detection and adjustment device according to claim 1, characterized in that: The laser receiver CCD (30) receives the laser beam signal emitted by the laser transmitter (20); when there is no coaxial error between the point to be detected and the laser beam measurement reference line, the laser beam spot is projected onto the coordinate center of the photoelectric detector coordinate system of the laser receiver CCD (30); when there is an error, the laser beam signal with error information will be projected onto a non-coordinate center of the photoelectric sensor coordinate system.

4. The helicopter transmission system coaxiality detection and adjustment device according to claim 1, characterized in that: When the laser emitter (20) is installed, the optical axis of the laser beam emitted by the laser emitter (20) is consistent with the transmission center of the output shaft installed thereon. The laser beam emitted by the laser emitter (20) serves as an output axis of the main reducer and is regarded as a measurement reference line.

5. The helicopter transmission system coaxiality detection and adjustment device according to claim 1, characterized in that: The central wavelength of the laser emitter (20) is (670±10) nm; the power is 250 mW; the operating voltage is 2.5 V; and the operating current is 30 mA.

6. The helicopter transmission system coaxiality detection and adjustment device according to claim 1, characterized in that: The resolution of the laser receiver CCD (30) is: 752 (H) × 582 (V); frame rate: 50,125 f / s; pixel size: 8.6 μm (H) × 8.3 μm (V); sensitivity: 0.1 lx; shutter speed: 1 / 50 to 1 / 10000 s.

7. The helicopter transmission system coaxiality detection and adjustment device according to claim 1, characterized in that: The computer 11 is connected to the control box 12 via a data line; the computer 11 is connected to the laser receiver CCD30 via a receiver connection line; the control box 12 is connected to the laser transmitter 20 via a transmitter connection line.

8. A method for detecting and adjusting the coaxiality of a helicopter transmission system, characterized in that: Methods include: Step 1: The laser receiver II (32) is connected to the input flange of the main reducer by screw end faces; Step 2: Install the engine simulation component at the engine installation position; Step 3: The No. II laser transmitter (22) is screwed into the engine output end flange, wherein the transmitter beam outlet faces the receiver; the engine output end flange is installed in conjunction with the engine simulation component through the positioning cylinder (223); after installation, the No. II laser transmitter (22) is started, and the output light spot is located at the center of the main reduction connection end of the engine simulation component by turning the knob on the second adjustment flange (222); Step 4: Start the main controller (10): Enter the measurement control program of the computer (11). Step 5: Start the laser transmitter II (22), and then manually rotate the engine output flange at a constant speed; Step 6: After the engine output end flange starts to rotate, the measurement control program in the computer (11) is run, and the engine output end flange stops rotating after rotating one circle; Step 7: Rotate laser receiver II (32) 180° and repeat step 6; Step 8: Wait for the measurement control program to give the coaxiality deviation result and position adjustment amount; Step 9: Turn off the No. II laser transmitter (22) and remove the coaxiality detection and adjustment device of the helicopter transmission system; Step 10: Detect the coaxiality of the engine-main reducer of the helicopter transmission system according to the distance error and the angle error, and adjust the engine-main reducer of the helicopter transmission system according to the engine position adjustment amount.

9. The method for detecting and adjusting the coaxiality of a helicopter transmission system according to claim 8, characterized in that: Step 8 includes: Step 81: Calculate the distance error using the formula Δyreal=cosα·Δy; Step 82: Calculate the angle error using the formula α=arctanΔy′ / f′; Step 83: Obtain the engine position adjustment amount by running the measurement control program of the computer (11).

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