A method and device for visually detecting surface defects of a micro-group-hole part of a gyratory body

Abstract

The application discloses a kind of rotary body micro group hole part surface defect visual inspection method and device, the device includes pedestal, part composite motion mechanism, image acquisition system, image acquisition system motion mechanism, end clamping mechanism;Part composite motion mechanism is set on the pedestal, completes X axis, Y axis, part angle adjustment and part rotation motion;Image acquisition system motion mechanism includes Z axis motion mechanism and A axis motion mechanism, image acquisition system is set on image acquisition system motion mechanism, for video and image shooting to the part to be detected;End clamping mechanism is set on the part composite motion mechanism, and the part to be detected is fixed and clamped on end clamping mechanism.Utilize the distribution of group hole in neighborhood to be counted in adaptive learning mode, and the adjacent topological relationship between hole is automatically established, and group hole surface defect is identified by detecting abnormal distribution.The method does not need to learn template in advance, and is strong in universality, and detection precision is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aviation manufacturing technology, in particular to a kind of surface defect visual inspection method and device of micro group hole parts of rotary body. BACKGROUND

[0002] Micro group hole parts are often connected and blind in processing due to small size and small diameter of the holes. These defects are all abnormal group hole distribution in the part, that is, the group hole distribution in the defect area neighborhood is inconsistent with that in other normal areas. The device and method can detect the surface defects of the entire part at one time, with high detection accuracy and strong universality. SUMMARY

[0003] The present application aims to provide a kind of surface defect visual inspection method and device of micro group hole parts of rotary body to solve the above problems.

[0004] The technical solution of the present application is a kind of surface defect visual inspection method of micro group hole parts of rotary body, comprising the following steps,

[0005] Step 1: install the rotary body part on the end clamping mechanism, adjust the part compound motion mechanism, and adjust the Y-axis motion mechanism to move forward and backward and the X-axis motion mechanism to move left and right to drive the part rotating motion mechanism and the part angle adjustment motion mechanism to move as a whole, while adjusting the image acquisition system motion mechanism, and adjusting the Z-axis motion mechanism to move up and down and the A-axis motion mechanism to move left and right to adjust the up-down-left-right movement of the image acquisition system, so that the imaging plane of the CCD camera is parallel to the generatrix of the rotary body part;

[0006] Step 2: the rotary body part rotates around its axis, and the image acquisition system performs line scanning on the rotary surface of the rotary body part to obtain the scanning gray-scale image of the developed rotary surface of the rotary body part;

[0007] Step 3: use a fixed threshold to binarize the developed image to obtain a binarized developed image, which highlights the processing holes;

[0008] Step 4: obtain the coordinate set of the pixel points contained in each hole by calculating the connected domain in the image , where subscript i represents the i-th hole, represents the number of pixels contained in the i-th hole, x is the column coordinate, and y is the row coordinate;

[0009] Step 5: calculate the centroid coordinates of each hole , where , ;

[0010] Step 6: Obtain the nearest hole on the left and the nearest hole on the right of the ith hole through the centroid coordinates, wherein the left nearest hole is represented as the first hole, and the right nearest hole is the second hole;

[0011] Step 7: Calculate the centroid distance between the ith hole and the first hole, and the centroid distance between the ith hole and the second hole, respectively represented as and , and calculate the average value .

[0012] Step 8: Traverse all holes, and when the ith hole is , it indicates that the ith hole has a defect, wherein .

[0013] In a second aspect, the present application provides a visual detection device for surface defects of a micro-group hole part of a rotary body, comprising a base, a part composite motion mechanism, an image acquisition system, an image acquisition system motion mechanism, and an end clamping mechanism. The part composite motion mechanism is arranged on the base and comprises an X-axis motion mechanism, a Y-axis motion mechanism, a part angle adjustment motion mechanism, and a part rotation motion mechanism, which complete the movement in the X-axis and Y-axis directions, part angle adjustment, and part rotation movement. The image acquisition system is arranged on the image acquisition system motion mechanism and is used for video and image shooting of the part to be detected. The image acquisition system motion mechanism comprises a Z-axis motion mechanism and an A-axis motion mechanism, which complete the movement of the image acquisition system. The end clamping mechanism is arranged on the part composite motion mechanism and is used for fixing the part to be detected.

[0014] Further, the Y-axis motion mechanism is arranged on the base, the X-axis motion mechanism is arranged above the Y-axis motion mechanism, the part angle adjustment motion mechanism is arranged vertically on the X-axis motion mechanism, the part rotation motion mechanism is arranged vertically on the part angle adjustment motion mechanism, and the part rotation motion mechanism is connected with the end clamping mechanism. The Z-axis motion mechanism is arranged on the base, the A-axis motion mechanism is arranged on the Z-axis motion mechanism, and the image acquisition system is arranged on the A-axis motion mechanism.

[0015] Further, the Y-axis motion mechanism comprises a motor one, a lead screw one, a connecting block one, a sliding block one, and a sliding rail one. The lead screw one is installed on the sliding rail one through a bearing mounting bracket. The sliding block one is slidingly installed above the lead screw one and moves back and forth along the lead screw one. The lead screw one, the sliding block one, and the sliding rail one are respectively provided with two. The output shaft of the motor one is connected with one end of the lead screw one through a shaft coupling. The bottom of the sliding rail one is provided with the connecting block one which is fixedly connected with the base.

[0016] Further, the X-axis movement mechanism comprises motor two, screw two, sliding block two, slide rail two and connecting block two, the output shaft of the motor two is connected with one end of the screw two through a shaft coupling, the other end of the screw two is installed on the one side support of the slide rail two through a bearing mounting frame, the sliding block two is slidably installed on the screw two and moves left and right along the direction of the screw two, the connecting block two is arranged at the bottom of the slide rail two, and the connecting block two is provided with two connecting blocks one of the Y-axis movement mechanism.

[0017] Further, the part rotation movement mechanism comprises motor three, rotating workbench one and connecting block three, the connecting block three is in T-shaped structure, the horizontal bottom thereof is connected with the X-axis movement mechanism, and the vertical side thereof is connected with the rotating workbench one, the motor three is connected with the rotating workbench one so as to drive the rotating workbench one to rotate; the part angle adjustment movement mechanism comprises a support, motor four and rotating workbench two, the support is vertically fixed on the rotating workbench one, the rotating workbench two is arranged on the support, the motor four is connected with the rotating workbench two, so as to drive the rotating workbench two to rotate, and the end clamping mechanism is connected with the rotating workbench two.

[0018] Further, the Z-axis movement mechanism comprises motor five, screw three, slide rail three, sliding block three and support two, the screw three is installed on the supports on the two sides of the slide rail three through a bearing mounting frame, the sliding block three is slidably installed on the screw three, and the bottom of the slide rail three is connected with the support two, the support two is vertically installed on the base, the screw three, the slide rail three, the sliding block three and the support two are all provided with two, and the output shaft of the motor five is connected with the screw three through a shaft coupling two, so as to drive the sliding block three to move up and down along the direction of the screw three.

[0019] Further, the A-axis movement mechanism comprises connecting block four, motor six, slide rail four, screw four and sliding block four, the connecting block four is provided with two and connected with the Z-axis movement mechanism respectively, the two connecting block fours are arranged at the two ends of the bottom of the slide rail four respectively, the screw four is installed on the supports on the two sides of the slide rail four through a bearing mounting frame, the sliding block four is connected with the screw four, and the output shaft of the motor six is connected with one end of the screw four through a shaft coupling, so as to drive the sliding block four to move left and right along the direction of the screw four.

[0020] Further, the image acquisition system comprises a CCD camera, a single-tube video microscope lens, a coaxial light source and a connecting block five, the CCD camera, the single-tube video microscope lens and the coaxial light source are sequentially installed on the connecting block five from top to bottom, and the connecting block five is connected with the A-axis movement mechanism.

[0021] The method uses self-adaptive learning to count the distribution of group holes in the neighborhood, automatically establishes the adjacent topological relationship between the holes, and identifies the surface defects of the group holes by detecting abnormal distribution. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application. It is apparent that the accompanying drawings described below are only some embodiments of the application, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0023] Figure 1 The structure schematic view of the rotary body part surface defect visual detection device provided by the application is equipped with a rotary body part;

[0024] Figure 2 The structure schematic view of the rotary body part surface defect visual detection device provided by the application is equipped with a rotary body part;

[0025] Figure 3 The structure schematic view of the rotary body part surface defect visual detection device provided by the application is equipped with a rotary body part;

[0026] Figure 4 The structure schematic view of the rotary body part surface defect visual detection device provided by the application is equipped with a rotary body part;

[0027] Figure 5 The structure schematic view of the rotary body part surface defect visual detection device provided by the application is equipped with a rotary body part;

[0028] 1-base,

[0029] 2-part composite motion mechanism, 21-Y axis motion mechanism, 2101-motor one, 2102-screw one, 2103-sliding block one, 2104-sliding rail one, 2105-connection block one, 2106-coupling one,

[0030] 22-X axis motion mechanism, 2201-motor two, 2202-screw two, 2203-sliding block two, 2204-sliding rail two, 2205-connection block two,

[0031] 23-part angle adjustment motion mechanism, 2301-connection block three, 2302-rotary workbench one, 2303-motor three,

[0032] 24-part rotary motion mechanism, 2401-bracket one, 2402-motor four, 2403-rotary workbench two,

[0033] 3-Image acquisition system, 301-CCD camera, 302-monocular video microscope lens, 303-coaxial light source, 304-connection block five,

[0034] 4-Image acquisition system motion mechanism, 41-Z axis motion mechanism, 4101-motor five, 4102-screw three, 4103-slideway three, 4104-slideway block three, 4105-support two, 4106-coupling two,

[0035] 42-A axis motion mechanism, 4201-connection block four, 4202-motor six, 4203-slideway four, 4204-screw four, 4205-slideway block four,

[0036] 5-End clamping mechanism, 6-rotary part. DETAILED DESCRIPTION

[0037] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art.

[0038] Referring to Figures 1-4 , a schematic view of a rotary part surface micro-hole group full-automatic visual detection device provided by the present application is shown, which comprises a base 1, a part composite motion mechanism 2, an image acquisition system 3, an image acquisition system motion mechanism 4, and an end clamping mechanism 5.

[0039] The part composite motion mechanism 2 is arranged on the base 1 and comprises an X-axis motion mechanism 22, a Y-axis motion mechanism 21, a part angle adjustment motion mechanism 23, and a part rotation motion mechanism 24, which complete the motion in the X-axis and Y-axis directions, part angle adjustment, and part rotation motion; the image acquisition system 3 is arranged on the image acquisition system motion mechanism 4 and is used for video and image shooting of the part to be detected; the image acquisition system motion mechanism 4 comprises a Z-axis motion mechanism 41 and an A-axis motion mechanism 42, which complete the motion of the image acquisition system; the end clamping mechanism 5 is arranged on the part composite motion mechanism 2, and the rotary part 6 to be detected is fixed and clamped on the end clamping mechanism 5.

[0040] The Y-axis movement mechanism 21 of the part composite movement mechanism 2 is arranged on the base 1, the X-axis movement mechanism 22 is arranged above the Y-axis movement mechanism 21, the part angle adjustment movement mechanism 23 is arranged on the X-axis movement mechanism 22, the part rotation movement mechanism 24 is arranged on the part angle adjustment movement mechanism 23, and the part rotation movement mechanism 24 is connected with the end clamping mechanism 5; the Z-axis movement mechanism 41 is arranged vertically on the base 1, the A-axis movement mechanism 42 is arranged on the Z-axis movement mechanism 41, and the image acquisition system 3 is arranged on the A-axis movement mechanism 42.

[0041] The Y-axis movement mechanism 21 comprises a motor 2101, a lead screw 2102, a sliding block 2103, a sliding rail 2104 and a connecting block 2105, the lead screw 2102 is arranged on the support of the sliding rail 2104 through a bearing mounting frame, the sliding block 2103 is slidably arranged on the lead screw 2102 and moves back and forth along the lead screw 2102, the lead screw 2102, the sliding block 2103 and the sliding rail 2104 are respectively provided with two, the output shaft of the motor 2101 is connected with one end of the lead screw 2102 through a coupling 2106, and the bottom of the sliding rail 2104 is provided with the connecting block 2105 which is fixedly connected with the base 1.

[0042] The X-axis movement mechanism 22 comprises a motor 2201, a lead screw 2202, a sliding block 2203, a sliding rail 2204 and a connecting block 2205, the lead screw 2202 is arranged on the supports on both sides of the sliding rail 2204 through a bearing mounting frame, the output shaft of the motor 2201 is connected with one end of the lead screw 2202 through a coupling, the sliding block 2203 is slidably arranged on the lead screw 2202 and moves left and right along the lead screw 2202, the connecting block 2205 is arranged at the bottom of the sliding rail 2204, and the connecting block 2205 is provided with two and connected with the two sliding blocks 2103 of the Y-axis movement mechanism 21.

[0043] The part angle adjustment movement mechanism 23 comprises a connecting block 2301, a rotating workbench 2302 and a motor 2303, the connecting block 2301 is in a T-shaped structure, the horizontal bottom of the connecting block 2301 is connected with the sliding block 2203 of the X-axis movement mechanism 22, one side of the vertical direction of the connecting block 2301 is connected with the rotating workbench 2302, and the motor 2303 is connected with the rotating workbench 2302 so as to drive the rotating workbench 2302 to rotate.

[0044] The part rotation movement mechanism 24 includes a support 1 401, a motor 4 402, a rotating table 2 403, the support 1 401 is vertically fixed on the rotating table 1 302, the rotating table 2 403 is placed on the support 1 401, the motor 4 402 is connected with the rotating table 2 403, so as to drive the rotating table 2 403 to rotate, the end clamping mechanism 5 is connected with the rotating table 2 403, the rotary body part 6 is fixed and clamped on the end clamping mechanism 5, and the rotation of the rotating table 2 403 drives the rotation of the rotary body part 6.

[0045] The Y-axis movement mechanism 21 drives the X-axis movement mechanism 22 to move forward and backward, the X-axis movement mechanism 22 drives the part angle adjustment movement mechanism 23 to move left and right, the part angle adjustment movement mechanism 23 drives the part rotation movement mechanism 24 to rotate, and the part rotation movement mechanism 24 drives the end clamping mechanism 5 to rotate, so as to drive the rotary body part 6 to rotate.

[0046] The Z-axis movement mechanism 41 includes a motor 5 4101, a screw 3 4102, a sliding rail 3 4103, a sliding block 3 4104 and a support 2 4105, the screw 3 4102 is installed on the supports on both sides of the sliding rail 3 4103 through a bearing mounting frame, the sliding block 3 4104 is slidingly installed on the screw 3 4102, the sliding rail 3 4103 is connected with the support 2 4105 at the bottom, the support 2 4105 is vertically installed on the base 1, the screw 3 4102, the sliding rail 3 4103, the sliding block 3 4104 and the support 2 4105 are all provided with two, and the output shaft of the motor 5 4101 is connected with the screw 3 4102 through a coupling 2 4106.

[0047] The A-axis movement mechanism includes a connecting block 4 4201, a motor 6 4202, a sliding rail 4 4203, a screw 4 4204 and a sliding block 4 4205, the connecting block 4 4201 is provided with two and connected with the two sliding blocks 3 4104 of the Z-axis movement mechanism 41 respectively, the two connecting blocks 4 4201 are respectively located at both ends of the bottom of the sliding rail 4 4203, the screw 4 4204 is installed on the supports on both sides of the sliding rail 4 4203 through a bearing mounting frame, the sliding block 4 4205 is connected with the screw 4 4204, and the output shaft of the motor 6 4202 is connected with one end of the screw 4 4204 through a coupling, so as to drive the sliding block 4 4205 to move left and right along the screw 4 4204.

[0048] The image acquisition system 3 includes a CCD camera 301, a single-tube video microscope lens 302, a coaxial light source 303, and a connecting block five 304. The CCD camera 301, the single-tube video microscope lens 302, and the coaxial light source 303 are sequentially installed on the connecting block five 304 from top to bottom. The connecting block five 304 is connected with a sliding block four 4205 of the A-axis movement mechanism 42. Thus, the Z-axis movement mechanism 41 drives the A-axis movement mechanism 42 to move up and down, the A-axis movement mechanism 42 drives the image acquisition system 3 to move left and right, and the up-down-left-right movement of the image acquisition system 3 is adjusted.

[0049] wherein Figure 3 is a state in which the body-of-revolution part 6 is just installed on the end clamping mechanism 5, Figure 4 is a state in which the body-of-revolution part 6 is installed on the end clamping mechanism 5 and the generatrix thereof is adjusted to be parallel to the imaging plane of the CCD camera 301.

[0050] A visual detection method for surface defects of a body-of-revolution part with micro-hole groups, comprising the following steps,

[0051] Step 1: install the body-of-revolution part 6 on the end clamping mechanism 5 (as shown in Figure 3 ), adjust the part compound movement mechanism 2, and adjust the front-back movement of the Y-axis movement mechanism 21 and the left-right movement of the X-axis movement mechanism 22 to drive the part rotation movement mechanism 24 and the part angle adjustment movement mechanism 23 to move as a whole, simultaneously adjust the image acquisition system movement mechanism 4, and adjust the up-down movement of the Z-axis movement mechanism 41 and the left-right movement of the A-axis movement mechanism 42 to adjust the up-down-left-right movement of the image acquisition system 3, so that the imaging plane of the CCD camera 301 is parallel to the generatrix of the body-of-revolution part 6 (as shown in Figure 4 );

[0052] Step 2: rotate the body-of-revolution part 6 around its axis, and the image acquisition system 3 performs line scanning on the rotation surface of the body-of-revolution part 6 to obtain a scanned gray-scale image of the developed rotation surface of the body-of-revolution part;

[0053] Step 3: perform binaryzation processing on the developed image by using a fixed threshold to obtain a binaryzation developed image, and the binaryzation image highlights the processing holes as shown in Figure 5 ;

[0054] Step 4: obtain the coordinate set of the pixel points contained in each hole through calculation of the connected domain in the image , wherein subscript i represents the i-th hole, represents the number of pixels contained in the i-th hole, x is the column coordinate, and y is the row coordinate;

[0055] Step 5: calculate the centroid coordinate of each hole , wherein , ;

[0056] Step 6: Obtain the left and right adjacent holes of the ith hole through the centroid coordinates, wherein the left adjacent hole is represented as the (i-1)th hole, and the right adjacent hole is represented as the (i+1)th hole.

[0057] Step 7: Calculate the centroid distance between the ith hole and the (i-1)th hole, and the centroid distance between the ith hole and the (i+1)th hole, respectively represented as d1 and d2, and calculate the average value d of d1 and d2.

[0058] Step 8: When d1>d2, or d1

[0059] The above examples are only used to illustrate the technical solutions of the present application, but not limit the present application. The modifications or equivalent replacements of the technical solutions of the present application made by the ordinary skilled in the art, as long as not departing from the spirit and scope of the present application, are all covered in the scope of the claims of the present application.​​​​​​​​​​​​

Claims

1. A method for visual inspection of surface defects of a micro-group-hole part of a gyratory body, characterized in that: The method comprises the following steps, Step 1: install the rotary part on the end clamping mechanism, respectively adjust the part composite motion mechanism and the image acquisition system motion mechanism, so that the imaging plane of the CCD camera is parallel to the generatrix of the rotary part; Step 2: the rotary part rotates around its axis, the image acquisition system performs line scanning on the rotary surface of the rotary part, and a scanning gray image of the developed rotary surface of the rotary part is obtained; Step 3: the developed image is binarized by using a fixed threshold, and a binarized developed image is obtained, wherein the binarized image highlights the processing holes; Step 4: Get the coordinate set of the pixel points contained in each hole by calculating the connected domain in the image wherein subscript i represents the i-th hole, represents the number of pixels contained in the i-th hole, x is the column coordinate, and y is the row coordinate. Step 5: Calculate the centroid coordinates of each hole where , ; Step 6: Get the left and right nearest holes of the ith hole by the barycentric coordinates, where the left nearest hole is denoted as the (i-1)th hole and the right nearest hole is the (i+1)th hole. Step 7: Calculate the distance between the ith hole and the left and right nearest holes.​ Step 7: Calculate the values ​​of the i-th hole and the i-th hole respectively. The distance between the centroids of the i-th holes and the distance between the i-th hole and the i-th hole. The distances between the centroids of the holes are respectively denoted as: and And calculate its mean. ; Step 8: Traverse all holes, if the i-th hole has then it means that the i-th hole has a defect, wherein the .

2. The visual inspection method for surface defects of micro-hole parts of a rotating body as described in claim 1, characterized in that: The rotary micro-group hole part surface defect visual detection device used in the method comprises a base, a part composite motion mechanism, an image acquisition system, an image acquisition system motion mechanism and an end clamping mechanism, The part composite motion mechanism is arranged on the base and comprises an X-axis motion mechanism, a Y-axis motion mechanism, a part angle adjustment motion mechanism and a part rotation motion mechanism, which can realize the movement in the X-axis and Y-axis directions, part angle adjustment and part rotation; The image acquisition system is arranged on the image acquisition system motion mechanism and is used for video and image shooting of the part to be detected; The image acquisition system motion mechanism comprises a Z-axis motion mechanism and an A-axis motion mechanism, which can realize the movement of the image acquisition system; The end clamping mechanism is arranged on the part composite motion mechanism and is used for fixing the part to be detected.

3. The method of claim 2, wherein the method further comprises: determining the position of the camera; and determining the position of the object. The Y-axis motion mechanism is arranged on the base, the X-axis motion mechanism is arranged above the Y-axis motion mechanism, the part angle adjustment motion mechanism is vertically arranged on the X-axis motion mechanism, the part rotation motion mechanism is vertically arranged on the part angle adjustment motion mechanism, and the part rotation motion mechanism is connected with the end clamping mechanism; the Z-axis motion mechanism is arranged on the base, the A-axis motion mechanism is arranged on the Z-axis motion mechanism, and the image acquisition system is arranged on the A-axis motion mechanism.

4. The method of claim 2, wherein the method is characterized by: The Y-axis motion mechanism comprises a motor one, a screw rod one, a connecting block one, a sliding block one and a sliding rail one, the screw rod one is installed on the sliding rail one through a bearing mounting frame, the sliding block one is slidingly installed above the screw rod one and moves back and forth along the screw rod one, the screw rod one, the sliding block one and the sliding rail one are respectively provided with two, the output shaft of the motor one is connected with one end of the screw rod one through a shaft coupling, and the bottom of the sliding rail one is provided with the connecting block one which is fixedly connected with the base.

5. The visual inspection method for surface defects of micro-hole parts of a rotating body as described in claim 2, characterized in that: The X-axis motion mechanism comprises a motor two, a screw rod two, a sliding block two, a sliding rail two and a connecting block two, the output shaft of the motor two is connected with one end of the screw rod two through a shaft coupling, the other end of the screw rod two is installed on one side of the sliding rail two through a bearing mounting frame, the sliding block two is slidingly installed on the screw rod two and moves left and right along the screw rod two, the connecting block two is arranged at the bottom of the sliding rail two, and the connecting block two is provided with two and connected with the Y-axis motion mechanism.

6. The visual inspection method for surface defects of micro-hole parts of a rotating body as described in claim 2, characterized in that: The part angle adjusting movement mechanism comprises motor three, rotating table one and connecting block three, the connecting block three is T-shaped structure, the horizontal direction bottom is connected with X shaft movement mechanism, the vertical direction one side is connected with rotating table one, the motor three connects rotating table one to drive rotating table one to rotate; The part rotating movement mechanism comprises support one, motor four and rotating table two, the support one is fixed vertically on rotating table one, the rotating table two is placed on the support one, the motor four is connected with rotating table two to drive rotating table two to rotate, the end clamping mechanism is connected with rotating table two.

7. The visual inspection method for surface defects of micro-hole parts of a rotating body as described in claim 2, characterized in that: The Z axis movement mechanism comprises motor five, screw three, slide rail three, sliding block three and support two, the screw three is installed on the support on both sides of slide rail three through bearing mounting bracket one, the sliding block three is slidingly installed on the screw three, the slide rail three bottom is connected with support two, the support two is installed vertically on the base, the screw three, slide rail three, sliding block three and support two are all provided with two, the output shaft of motor five is connected with screw three through coupling two, thereby driving sliding block three to move up and down along the direction of screw three.

8. The visual inspection method for surface defects of micro-hole parts of a rotating body as described in claim 2, characterized in that: The A axis movement mechanism comprises connecting block four, motor six, slide rail four, screw four and sliding block four, the connecting block four is provided with two and connected with Z axis movement mechanism respectively, the two connecting block fours are placed on both ends of slide rail four bottom respectively, the screw four is installed on the support on both sides of slide rail four through bearing mounting bracket, the sliding block four is connected with screw four, the output shaft of motor six is connected with one end of screw four through coupling, thereby driving sliding block four to move left and right along the direction of screw four.

9. The visual inspection method for surface defects of a rotating micro-hole part as described in claim 2, characterized in that: The image acquisition system comprises CCD camera, single tube video microscope lens, coaxial light source and connecting block five, the CCD camera, single tube video microscope lens and coaxial light source are installed on connecting block five from top to bottom, the connecting block five is connected with A axis movement mechanism.

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