Blade deflection flexible measurement device and method based on vision

Abstract

The invention provides a blade deflection flexible measuring device based on industrial vision, and the device comprises a fixed rack assembly which is used for fixing the root part of a blade; the industrial camera is arranged at the position as high as the upper surface of the root of the paddle, and the industrial camera is used for shooting the projection appearance of the whole paddle mounting side surface; a ground track; the moving trolley assembly is arranged on the ground track; wherein the moving trolley assembly can slide along the ground track, and the moving trolley assembly is used for installing the industrial camera; meanwhile, the invention further provides a blade deflection flexible measurement method based on vision. According to the invention, the deflection value parameter of the blade can be measured visually and conveniently, and the measurement of blades of different models and specifications can be compatible.

Description

Technical Field

[0001] The present application belongs to the technical field of helicopters, and in particular relates to a blade deflection flexibility measurement device and method based on vision. Background Art

[0002] Blade deflection is one of the important parameters of helicopter composite blades, and its value reflects the rigidity of the blade itself. After the blade is manufactured, it is necessary to accurately measure its actual deflection value and compare it with the theoretical parameters to confirm whether the blade is qualified.

[0003] Currently, blade deflection is generally measured using a ruler. First, the root of the blade is fixed on the stand with a pin, and the blade deflection is measured by reading the scale value of the ruler corresponding to the blade tip. This method has the following problems:

[0004] 1. Due to the inevitable gap between the propeller root bushing hole and the latch, the propeller root is not level and the propeller blade is tilted forward as a whole. The small forward tilt angle will cause a large displacement deviation of the propeller tip in the length direction, resulting in inaccurate measurement values ​​(such as Figure 4 ).

[0005] 2. The current measurement method has poor versatility and is incompatible with blades of different lengths. Each blade requires a set of measuring devices.

[0006] 3. The operation is complicated, the measurement accuracy is low, and the measured value needs to be converted manually, which is not intuitive and prone to errors. Summary of the invention

[0007] Purpose of the invention: The present application provides a new blade deflection flexibility measurement method based on industrial vision, which can intuitively and conveniently measure the blade deflection value parameters, and is compatible with the measurement of blades of various models and specifications.

[0008] In a first aspect, the present application provides a blade deflection flexibility measurement device based on industrial vision, the device comprising:

[0009] A fixed stand assembly, used to fix the root of the blade;

[0010] The industrial camera is arranged at a position which is at the same height as the upper surface of the root of the blade, and is used to photograph the projection shape of the entire blade installation side.

[0011] Preferably, the device further comprises:

[0012] Ground track;

[0013] A moving trolley assembly is arranged on the ground track; wherein the moving trolley assembly can slide along the ground track, and the moving trolley assembly is used to install the industrial camera.

[0014] Preferably, the fixed stand assembly comprises:

[0015] Stand;

[0016] A support, arranged on the stand;

[0017] A connecting member, arranged on the support;

[0018] A quick-change head is connected to the connecting piece, and the quick-change head is used to install the root of the blade.

[0019] Preferably, the support comprises:

[0020] A vertical plate is used for installing the connecting piece.

[0021] Preferably, the connecting piece is an I-shaped structure.

[0022] Preferably, the connecting member comprises:

[0023] A back plate, mounted on the vertical plate;

[0024] Two reinforcing ribs, one end of each reinforcing rib being connected to the back plate;

[0025] A panel is connected to the other end of the reinforcing rib; wherein a slot is formed between the back plate, the panel and the reinforcing rib, and the slot is used to install the quick-change head.

[0026] Preferably, the quick-change head comprises:

[0027] A clamping portion, used for mounting the root of the blade;

[0028] The clamping part has a groove and a protrusion; wherein the panel can be embedded in the groove, and the protrusion can be embedded in the clamping slot.

[0029] Preferably, the device further comprises:

[0030] The operation display terminal is used to control the movement of the mobile trolley assembly along the ground track, and control the industrial camera to capture the projection shape of the entire blade installation side, compare it with the theoretical data shape, analyze and output the measurement results.

[0031] In a second aspect, the present application also provides a method for measuring blade deflection flexibility based on vision, the method comprising:

[0032] Step 1: Install the propeller blade on the quick-change head through the propeller root bushing hole, and use the bushing pin to fix the propeller root to the quick-change head;

[0033] Step 2: Start the industrial camera on the operation screen of the operation display terminal and turn on the industrial camera photo function;

[0034] Step 3: Start the mobile trolley assembly. The industrial camera moves with the mobile trolley assembly at a constant speed toward the tip of the blade at the set speed. At this time, the industrial camera will take pictures along the side of the blade and compare them in real time. At the same time, the built-in software will automatically fit the photographed side part into the overall projection shape of the side of the blade.

[0035] Step 4: Compare the blade side projection shape obtained by fitting the image taken by the industrial camera with the theoretical side projection shape through system comparison; obtain the deviation value of the blade tip feature in height, which is the measured blade deflection value;

[0036] Step 5: Output the deflection value obtained by comparing the measured value with the theoretical value to the operation interface; compare it with the theoretical value to determine whether the result is qualified.

[0037] Beneficial technical effects of this application:

[0038] In the structure described in the present application: the blades are connected and fixed by a quick-change head, a pin and a connecting piece on a fixed stand, wherein the connection interface size of the quick-change head matches the size of the connecting piece. The root parts of blades of different models and specifications have different sizes. By replacing quick-change heads of different specifications, flexible clamping of blades of different sizes for multiple models can be achieved.

[0039] Through flexible clamping of the blade and the side projection captured by the industrial camera, the system can fit and compare the shape measured by the industrial camera with the theoretical shape of the blade, and obtain the actual blade deflection value. This measurement method eliminates the measurement deviation at the tip of the blade caused by the uneven end surface of the blade root bushing due to the installation gap of the blade root. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of a flexible blade deflection measuring device provided in an embodiment of the present application;

[0041] Figure 2 It is a schematic diagram of the structure of the blade root clamping and quick-change part provided in an embodiment of the present application;

[0042] Figure 3 is a schematic diagram of blade measurement data fitting comparison provided in an embodiment of the present application;

[0043] Figure 4 It is a schematic diagram of the principle of the current measurement method provided in the embodiment of the present application;

[0044] Among them: 1-fixed stand assembly, 2-mobile trolley assembly, 3-industrial camera, 4-operation display terminal, 5-ground track, 6-connector, 7-quick-change head, 8-bushing pin, 9-blade side measurement projection shape, 10-blade side theoretical projection shape. DETAILED DESCRIPTION

[0045] Combined with Figure 1-Figure 4 , the blade deflection flexibility measurement device and method proposed in this application are further explained.

[0046] like Figure 1 As shown, the structure of the flexible blade deflection measuring device provided in the present application mainly includes a fixed stand assembly 1, a mobile trolley assembly 2, an industrial camera 3, an operation display terminal 4, a movable track 5, a connector 6, a quick-change head 7, a bushing pin 8, etc.

[0047] The mobile trolley assembly is a mobile carrier of the industrial camera. By driving the rollers with a motor, the industrial camera can be moved parallel to the ground track 5. The center line of the industrial camera is at the same height as the blade root plane, so the side projection in the full length direction of the blade can be measured.

[0048] like Figure 2 As shown, the blades are connected and fixed by a quick-change head, a pin and a connector on a fixed stand. The root parts of blades of different models and specifications have different sizes. By replacing quick-change heads of different specifications, flexible clamping of blades of multiple models can be achieved.

[0049] Through flexible clamping of the blade and measurement by an industrial camera, the system can compare the shape measured by the industrial camera with the theoretical shape of the blade, and obtain the actual blade deflection value, thus avoiding the influence of the angle error of the clamping on the measurement result.

[0050] The present application provides a novel blade deflection measurement method, the main structure of which includes: a blade flexible clamping assembly, a mobile trolley assembly, a visual measurement system and other parts.

[0051] The blade flexible clamping assembly is used for blade root positioning and flexible clamping, and is applicable to blades of different models by replacing the clamping head.

[0052] The mobile trolley assembly is the carrier of the industrial camera. The bottom of the trolley is provided with a driving motor, a driving roller, and a driven roller. The driving motor assembly enables the driving roller to roll on the ground rail and move along the rail. The movement of the trolley enables the camera to move at a uniform speed and smoothly in the length direction to measure the complete side projection view of the blade. At the same time, it has good compatibility in the length direction.

[0053] In the embodiment of the present application, the visual measurement system is the measurement and calculation part of the blade deflection parameters. The camera takes a side projection of the full length of the blade through the movement of the trolley, and compares the projection view with the theoretical view. The deflection value is calculated and output to the screen for display.

[0054] In the structure described in the present application: the blades are connected and fixed by a quick-change head, a pin and a connecting piece on a fixed stand, wherein the connection interface size of the quick-change head matches the size of the connecting piece. The root parts of blades of different models and specifications have different sizes. By replacing quick-change heads of different specifications, flexible clamping of blades of different sizes for multiple models can be achieved.

[0055] Through flexible clamping of the blade and the side projection captured by the industrial camera, the system can fit and compare the shape measured by the industrial camera with the theoretical shape of the blade, and obtain the actual blade deflection value. This measurement method eliminates the measurement deviation at the tip of the blade caused by the uneven end surface of the blade root bushing due to the installation gap of the blade root.

[0056] The present application provides a blade deflection flexibility measurement device based on industrial vision, the device comprising: a fixed stand assembly for fixing the root of the blade; an industrial camera, arranged at a position equal to the upper surface of the root of the blade, the industrial camera being used to photograph the projection shape of the entire blade installation side; a ground track; a mobile trolley assembly, arranged on the ground track; wherein the mobile trolley assembly can slide along the ground track, the mobile trolley assembly being used to install the industrial camera; at the same time, the present application also provides a blade deflection flexibility measurement method based on vision; the present application can intuitively and conveniently measure the blade deflection value parameters, and can be compatible with the measurement of blades of various models and specifications.

Claims

1. A blade deflection flexibility measurement device based on industrial vision, characterized in that: The device comprises: A fixed stand assembly, used to fix the root of the blade; The industrial camera is arranged at a position which is at the same height as the upper surface of the root of the blade, and is used to photograph the projection shape of the entire blade installation side.

2. The device according to claim 1, characterized in that The device also includes: Ground track; A moving trolley assembly is arranged on the ground track; wherein the moving trolley assembly can slide along the ground track, and the moving trolley assembly is used to install the industrial camera.

3. The device according to claim 2, characterized in that The fixed stand assembly comprises: Stand; A support, arranged on the stand; A connecting member, arranged on the support; A quick-change head is connected to the connecting piece, and the quick-change head is used to install the root of the blade.

4. The device according to claim 3, characterized in that The support comprises: A vertical plate is used for installing the connecting piece.

5. The device according to claim 4, characterized in that The connecting piece is an I-shaped structure.

6. The device according to claim 5, characterized in that The connecting piece comprises: A back plate, mounted on the vertical plate; Two reinforcing ribs, one end of each reinforcing rib being connected to the back plate; A panel is connected to the other end of the reinforcing rib; wherein a slot is formed between the back plate, the panel and the reinforcing rib, and the slot is used to install the quick-change head.

7. The device according to claim 6, characterized in that The quick-change head comprises: A clamping portion, used for mounting the root of the blade; The clamping part has a groove and a protrusion; wherein the panel can be embedded in the groove, and the protrusion can be embedded in the clamping slot.

8. The device according to claim 6, characterized in that The device also includes: The operation display terminal is used to control the movement of the mobile trolley assembly along the ground track, and control the industrial camera to capture the projection shape of the entire blade installation side, compare it with the theoretical data shape, analyze and output the measurement results.

9. A method for measuring blade deflection flexibility based on vision, characterized in that: The method comprises: Step 1: Install the propeller blade on the quick-change head through the propeller root bushing hole, and use the bushing pin to fix the propeller root to the quick-change head; Step 2: Start the industrial camera on the operation screen of the operation display terminal and turn on the industrial camera photo function; Step 3: Start the mobile trolley assembly. The industrial camera moves with the mobile trolley assembly at a constant speed toward the tip of the blade at the set speed. At this time, the industrial camera will take pictures along the side of the blade and compare them in real time. At the same time, the built-in software will automatically fit the photographed side part into the overall projection shape of the side of the blade. Step 4: Compare the blade side projection shape obtained by fitting the image taken by the industrial camera with the theoretical side projection shape through system comparison; obtain the deviation value of the blade tip feature in height, which is the measured blade deflection value; Step 5: Output the deflection value obtained by comparing the measured value with the theoretical value to the operation interface; compare it with the theoretical value to determine whether the result is qualified.

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