Visual detection device and detection method for alignment coaxiality of thrust pin of engine

Abstract

The invention relates to an engine thrust pin alignment coaxiality visual detection device and detection method applied to the technical field of engine assembly, the visual detection device comprises a simulation visual detection mechanism, a machine body tool mechanism and a processing calculation system, and the simulation visual detection mechanism comprises a thrust pin simulation piece; a visual camera is fixedly installed on the inner side of the thrust pin simulation piece, a fixed circular ring matched with the thrust pin simulation piece is arranged at one end of the thrust pin simulation piece, the machine body tool mechanism comprises a supporting shell, and a light uniformizing plate is embedded in one end of the supporting shell in a penetrating mode; according to the visual detection device, the problem of coaxiality measurement of the thrust pin hole of the engine can be converted into the problem of measurement of the distance between the centers of the two circles in a plane, and the distance between the centers of the two circles can be calculated through simulation detection and detection, so that relevant technical personnel can perform corresponding adjustment according to detection and calculation results, and the detection accuracy is improved. Therefore, the thrust pin can be accurately aligned with the bearing hole, and the efficiency and the quality of butt joint assembly of the thrust pin can be effectively improved.

Description

Technical Field

[0001] The present invention relates to a detection device and a detection method, and in particular to a visual detection device and a detection method for the coaxiality of an engine thrust pin applied in the technical field of engine assembly. Background Art

[0002] The thrust pin of an aircraft engine is a key component that connects the engine to the aircraft body. Its main function is to transfer the thrust generated by the engine to the aircraft structure, ensure that the engine can be firmly fixed to the aircraft during operation, and effectively transfer the thrust to the body, thereby driving the aircraft to fly. The precise docking of the thrust pin is a key link in the installation process of the aircraft engine.

[0003] The invention patent with publication number CN118816716A discloses a visual alignment device for an aircraft engine thrust pin. The visual alignment device detects the position information of the thrust pin on the engine by using a camera in conjunction with an external computer, thereby aligning the position of the engine, thereby achieving the purpose of engine position alignment and avoiding errors during the production and assembly process.

[0004] The invention patent with publication number CN110704940B discloses a method for processing the position deviation of the intersection point of an aircraft engine installation. The method for processing the position deviation of the intersection point of an engine installation can safely and reliably solve the progress problem during aircraft production and assembly, and save the huge economic cost of replacing aircraft frame sections and engine parts, and has great practical value.

[0005] In the prior art, the butt assembly of thrust pins mainly relies on manual operation. Due to the small assembly space and difficult operation, at least two workers are required to assemble at two thrust pins at the same time, and at least one operator is required to control the equipment, resulting in a long time for butt assembly (usually about 2 hours). In addition, due to the difference in hand feel between different workers, the assembly effect may be inconsistent, and good coordination between workers is required to ensure synchronous docking. Long-term manual docking may also cause worker fatigue and affect the assembly quality. Therefore, we propose a visual detection device and method for the coaxiality of engine thrust pins. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is: how to improve the efficiency and quality of thrust pin docking assembly.

[0007] In order to solve the above problems, the present invention provides a visual inspection device for the coaxiality of the thrust pin of an engine, comprising a simulation visual inspection mechanism, a body tooling mechanism and a processing and computing system;

[0008] The simulated visual inspection mechanism includes a thrust pin simulation part, a visual camera is fixedly installed on the inner side of the thrust pin simulation part, a fixed circular ring matching the thrust pin simulation part is arranged at one end of the thrust pin simulation part, a visual positioning component and an axial positioning component are arranged on the thrust pin simulation part, and a visual lens is arranged on the visual camera;

[0009] The machine body tooling mechanism comprises a supporting shell, one end of the supporting shell is penetrated and embedded with a light scattering plate, the other end of the supporting shell is fixedly connected with a pin hole matching shaft, and a light source is arranged in the supporting shell;

[0010] The processing and computing system includes an image processing module, an extraction and computing module, and a result display module. The visual camera is connected to the image processing module by signal, the image processing module is connected to the extraction and computing module by signal, and the extraction and computing module is connected to the result display module by signal.

[0011] In the above-mentioned engine thrust pin alignment coaxiality visual inspection device, the problem of measuring the coaxiality of the engine thrust pin hole can be converted into the problem of measuring the center distance between two plane circles, and the distance between the centers of the two circles can be detected and calculated through simulation detection, thereby effectively improving the efficiency and quality of thrust pin docking assembly.

[0012] As a further improvement of the present application, the thrust pin simulation is matched with the thrust pin to be assembled, the fixed circular ring is located directly in front of the visual camera, the inner diameter of the fixed circular ring is equal to the inner diameter of the thrust pin simulation, the light-distributing plate is made of transparent material, the pin hole matching shaft is matched with the bearing hole of the movable bearing on the aircraft engine to be assembled, and the number of the simulated inspection mechanism and the fuselage tooling mechanism are both two.

[0013] As a further improvement of the present application, the light source is an LED lamp, a power supply for supplying power to the light source is arranged inside the supporting shell, and a switch for controlling the light source is arranged on the outer wall of the supporting shell.

[0014] As another improvement of the present application, a detection method of a visual detection device for detecting the coaxiality of an engine thrust pin includes the following steps:

[0015] S1. Install the thrust pin simulation part onto the thrust pin holder;

[0016] S2, insert the pin hole matching shaft into the bearing hole of the spherical plain bearing on the aircraft engine, and make the support housing and the spherical plain bearing abut against each other;

[0017] S3, turn on the light source, record the inner circle contour of the fixed circle ring as the fixed circle, record the edge contour of the light averaging plate as the moving circle, control the visual camera to take pictures of the fixed circle and the moving circle, and transmit the taken pictures to the image processing module;

[0018] S4, the image processing module processes the image and transmits the processed image to the extraction calculation module;

[0019] S5. The extraction calculation module extracts the centers of the fixed circle and the moving circle in the image and compares them, calculates the distance between the centers of the fixed circle and the moving circle, and sends the calculation result to the result display module, so that the result display module displays the calculation result.

[0020] As another improvement supplement of the present application, the thrust pin clamp is a component fixedly installed on the aircraft body for fixing the thrust pin, and there are two thrust pin clamps in total, and the two thrust pin clamps are respectively located on the left and right sides of the engine. When the thrust pin simulation component is installed on the thrust pin clamp in step S2, the two thrust pin simulation components in the two simulation inspection mechanisms are respectively installed on the two thrust pin clamps.

[0021] As another improved supplement of the present application, the number of spherical bearings is two, and the two spherical bearings are respectively located at the left and right ends of the engine. When the pin hole matching shaft is inserted into the bearing hole of the spherical bearing on the aircraft engine in step S2, the two pin hole matching shafts in the two body tooling mechanisms are respectively inserted into the bearing holes of the two spherical bearings.

[0022] To summarize, through the joint setting of the simulated visual inspection mechanism, the body tooling mechanism, and the processing and computing system, the visual inspection device in the present application can transform the problem of measuring the coaxiality of the engine thrust pin hole into the problem of measuring the center distance of two circles on a plane, and can detect and calculate the distance between the centers of the two circles through simulated detection, so that relevant technical personnel can make corresponding adjustments based on the results of the detection and calculation to accurately align the thrust pin with the bearing hole, thereby effectively improving the efficiency and quality of the thrust pin docking assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the simulated visual inspection mechanism in the first and second embodiments of the present application;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of the machine body tooling mechanism in the first and second embodiments of the present application;

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the support housing in the first and second embodiments of the present application;

[0026] Figure 4 This is a system structure block diagram of the processing and computing system in the first and second implementation modes of the present application;

[0027] Figure 5 This is a pictographic demonstration diagram of the detection in the second embodiment of the present application.

[0028] Description of the numbers in the figure:

[0029] 101. Thrust pin simulation component; 102. Visual camera; 103. Fixed ring; 104. Rotational positioning assembly; 105. Axial positioning assembly; 106. Visual lens; 201. Support housing; 202. Light distribution plate; 203. Pin hole matching shaft; 204. Light source. DETAILED DESCRIPTION

[0030] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0031] The first implementation method:

[0032] Figure 1-4 The invention shows a visual inspection device and method for the coaxiality of an engine thrust pin, which includes a simulation visual inspection mechanism, a body tooling mechanism and a processing and computing system. The simulation visual inspection mechanism includes a thrust pin simulation part 101. The shape and size of the thrust pin simulation part 101 are consistent with those of a real engine thrust pin. After the thrust pin simulation part 101 is installed on the thrust pin clamp, the axis of the thrust pin simulation part 101 will coincide with the axis of the real thrust pin after installation. A visual camera 102 is fixedly installed on the inner side of the thrust pin simulation part 101. A fixed circular ring 103 matching the thrust pin simulation part 101 is provided at one end of the thrust pin simulation part 101. A visual positioning component 104 and an axial positioning component 105 are provided on the thrust pin simulation part 101. A visual lens 106 is provided on the visual camera 102. The fixed circular ring 103 is located directly in front of the visual camera 102. The inner side of the fixed circular ring 103 is provided with a matching fixed circular ring 103. The diameter is equal to the inner diameter of the thrust pin simulation part 101, the body tooling mechanism includes a supporting shell 201, one end of the supporting shell 201 is penetrated and embedded with a light-distributing plate 202, the light-distributing plate 202 is made of transparent material, the other end of the supporting shell 201 is fixedly connected with a pin hole matching shaft 203, a light source 204 is arranged in the supporting shell 201, the light source 204 is an LED lamp, a power supply for supplying power to the light source 204 is arranged in the supporting shell 201, a switch for controlling the light source 204 is arranged on the outer wall of the supporting shell 201, the processing and computing system includes an image processing module, an extraction and computing module, and a result display module, the visual camera 102 is signal-connected with the image processing module, the image processing module is signal-connected with the extraction and computing module, the extraction and computing module is signal-connected with the result display module, and the number of the simulated visual inspection mechanism and the body tooling mechanism are both two.

[0033] By jointly setting up a simulated visual inspection mechanism, a body tooling mechanism, and a processing and computing system, the visual inspection device in the present application can convert the problem of measuring the coaxiality of the engine thrust pin hole into the problem of measuring the center distance of two plane circles, and can detect and calculate the distance between the centers of the two circles through simulated detection, so that relevant technical personnel can make corresponding adjustments based on the results of the detection and calculation to accurately align the thrust pin with the bearing hole, thereby effectively improving the efficiency and quality of the thrust pin docking assembly.

[0034] The second implementation method:

[0035] See also Figure 1-Figure 5 , a detection method of a visual detection device for detecting the coaxiality of an engine thrust pin, comprising the following steps:

[0036] S1. Install the thrust pin simulation part 101 onto the thrust pin clamp;

[0037] S2, inserting the pin hole matching shaft 203 into the bearing hole of the spherical plain bearing on the aircraft engine, and making the supporting housing 201 butt against the spherical plain bearing;

[0038] S3, turn on the light source 204, record the inner circle contour of the fixed circle ring 103 as the fixed circle, record the edge contour of the light homogenizing plate 202 as the moving circle, control the visual camera 102 to take pictures of the fixed circle and the moving circle, and transmit the taken pictures to the image processing module;

[0039] S4, the image processing module processes the image and transmits the processed image to the extraction calculation module;

[0040] S5. The extraction and calculation module extracts the centers of the fixed circle and the moving circle in the image and compares them, calculates the distance between the centers of the fixed circle and the moving circle (image processing, center extraction and comparison of the centers, and calculation of the distance between the centers, these technologies are mature existing technologies and are well-known technologies to those skilled in the art, and their specific contents are not repeated here), and sends the calculation results to the result display module, so that the result display module displays the calculation results.

[0041] The thrust pin clamp is a component fixedly installed on the aircraft body for fixing the thrust pin. There are two thrust pin clamps in total, and the two thrust pin clamps are respectively located on the left and right sides of the engine. When the thrust pin simulation component 101 is installed on the thrust pin clamp in step S1, the two thrust pin simulation components 101 in the two simulated inspection mechanisms are respectively installed on the two thrust pin clamps. The number of joint bearings is two, and the two joint bearings are respectively located on the left and right ends of the engine. When the pin hole matching shaft 203 is inserted into the bearing hole of the joint bearing on the aircraft engine in step S2, the two pin hole matching shafts 203 in the two body tooling mechanisms are respectively inserted into the bearing holes of the two joint bearings.

[0042] During the inspection, the problem of measuring the coaxiality of the engine thrust pin hole is transformed into the problem of the center distance of two plane circles. One circle is the edge of the workpiece that is relatively fixed by the camera (fixed circle), and the other circle is the edge of the movable workpiece (moving circle). The actual center distance is determined by the ratio of the image center distance to the circle radius and combined with the known actual radius, which is the coaxiality deviation.

[0043] After the inspection is completed, remove the simulated inspection mechanism from the thrust pin holder, and remove the body tooling mechanism from the engine. Install the thrust pin on the thrust pin holder, and make corresponding adjustments based on the inspection and calculation results. This way, the thrust pin can be aligned with the bearing hole, thereby effectively improving the efficiency and quality of the thrust pin docking assembly.

[0044] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A visual inspection device for engine thrust pin alignment coaxiality, characterized in that: It includes simulation visual inspection mechanism, body tooling mechanism and processing and computing system; The simulated visual inspection mechanism comprises a thrust pin simulation part (101), a visual camera (102) is fixedly installed on the inner side of the thrust pin simulation part (101), a fixed circular ring (103) matching the thrust pin simulation part (101) is arranged at one end of the thrust pin simulation part (101), a visual positioning component (104) and an axial positioning component (105) are arranged on the thrust pin simulation part (101), and a visual lens (106) is arranged on the visual camera (102); The machine body tooling mechanism comprises a supporting shell (201), one end of the supporting shell (201) is penetrated and embedded with a light-diffusing plate (202), the other end of the supporting shell (201) is fixedly connected with a pin hole matching shaft (203), and a light source (204) is arranged in the supporting shell (201); The processing and computing system comprises an image processing module, an extraction and computing module, and a result display module. The visual camera (102) is connected to the image processing module by signal, the image processing module is connected to the extraction and computing module by signal, and the extraction and computing module is connected to the result display module by signal.

2. The engine thrust pin alignment coaxiality visual detection device according to claim 1, characterized in that: The thrust pin simulation part (101) matches the thrust pin to be assembled, the fixed circular ring (103) is located directly in front of the visual camera (102), the inner diameter of the fixed circular ring (103) is equal to the inner diameter of the thrust pin simulation part (101), the light-distributing plate (202) is made of transparent material, the pin hole matching shaft (203) matches the bearing hole of the movable bearing on the aircraft engine to be assembled, and the number of the simulated visual inspection mechanism and the fuselage tooling mechanism are both two.

3. The engine thrust pin alignment coaxiality visual detection device according to claim 1, characterized in that: The light source (204) is an LED lamp, a power source for supplying power to the light source (204) is arranged inside the supporting shell (201), and a switch for controlling the light source (204) is arranged on the outer wall of the supporting shell (201).

4. A detection method for a visual detection device for the alignment of a thrust pin of an engine, applied to the visual detection device for the alignment of a thrust pin of an engine as claimed in claim 2, characterized in that: The following steps are involved: S1. Install the thrust pin simulation component (101) onto the thrust pin holder; S2, inserting the pin hole matching shaft (203) into the bearing hole of the spherical bearing on the aircraft engine, and making the supporting housing (201) butt against the spherical bearing; S3, turning on the light source (204), recording the inner circle contour of the fixed circle ring (103) as the fixed circle, recording the edge contour of the light homogenizing plate (202) as the moving circle, controlling the visual camera (102) to take pictures of the fixed circle and the moving circle, and transmitting the taken pictures to the image processing module; S4, the image processing module processes the image and transmits the processed image to the extraction calculation module; S5. The extraction calculation module extracts the centers of the fixed circle and the moving circle in the image and compares them, calculates the distance between the centers of the fixed circle and the moving circle, and sends the calculation result to the result display module, so that the result display module displays the calculation result.

5. The detection method of the engine thrust pin alignment coaxiality visual detection device according to claim 4, characterized in that: The thrust pin clamp is a component fixedly mounted on the aircraft body for fixing the thrust pin. There are two thrust pin clamps in total, and the two thrust pin clamps are respectively located on the left and right sides of the engine. When the thrust pin simulation component (101) is installed on the thrust pin clamp in step S1, the two thrust pin simulation components (101) in the two simulation inspection mechanisms are respectively installed on the two thrust pin clamps.

6. The detection method of the engine thrust pin alignment coaxiality visual detection device according to claim 5, characterized in that: The number of the joint bearings is two, and the two joint bearings are respectively located at the left and right ends of the engine. When the pin hole matching shaft (203) is inserted into the bearing hole of the joint bearing on the aircraft engine in step S2, the two pin hole matching shafts (203) in the two body tooling mechanisms are respectively inserted into the bearing holes of the two joint bearings.

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