Vacuum pump cover defect detection device based on machine vision technology

Abstract

The application discloses a vacuum pump cover defect detection device based on machine vision technology and relates to the technical field of pump cover detection tools, which comprises a detection box main body. Through the setting of the area calibration module, the staff's body passes through the safety grating but is still in the safety area, only triggers the early warning alarm, does not suspend the electrical element, effectively avoids the problem that the traditional safety grating is frequently triggered to stop due to the temporary entry of the body, through the setting of the parameter setting module, the camera exposure time is limited according to the fuzzy pixel formula, the defects are not missed according to the frame rate formula, and when the pump cover performs multi-axis composite motion such as rotation, lifting and swinging, the synthesized speed is calculated and the exposure time is dynamically adjusted. Meanwhile, the exposure time and frame rate required by the first and second vision cameras are back calculated in combination with historical motion data, dynamic matching of the camera parameters and motion speed is realized, and the image blur or missing shooting phenomenon caused by the mismatch between the motion speed and the camera frame rate is effectively prevented.

Description

Technical Field

[0001] This invention relates to the field of pump cover inspection tools, and in particular to a vacuum pump cover defect inspection device based on machine vision technology. Background Technology

[0002] With the rapid development of the vacuum equipment manufacturing industry, the requirements for detecting the appearance defects and dimensional accuracy of vacuum pump covers, as core components of equipment, continue to increase. As a core automated inspection device, vacuum pump cover defect detection equipment based on machine vision technology is facing increasing market demand and inspection standards. Machine vision inspection is the mainstream technical means for defect detection of such components. The existing machine vision device for detecting defects in vacuum pump covers mainly consists of five parts: the inspection box body, the vision inspection component, the clamping and positioning component, the attitude adjustment component, and the safety protection component. The inspection box body serves as the device's load-bearing frame; the vision inspection component is responsible for acquiring defect images; the clamping and positioning component secures the pump cover; the attitude adjustment component assists in the inspection operation through fixed supports installed at multiple different positions within the clamping box body; and the safety protection component ensures operational safety. The vision inspection component, typically using a single fixed camera, is the core component for acquiring pump cover defect information. The clamping and positioning component primarily uses rigid clamps to secure the pump cover to be inspected. The attitude adjustment component only has simple lifting or unidirectional rotation functions to assist in completing basic inspection tasks. While the above structure can meet the basic inspection requirements for pump cover defects, the existing technology suffers from several drawbacks. The fixed installation of the vision camera results in a single inspection angle, and the posture adjustment only supports single-dimensional movement, failing to achieve multi-dimensional coordinated adjustment of rotation, tilt, and height. This leads to incomplete image acquisition, low detection accuracy, and insufficient automated coordination among components, severely reducing inspection efficiency and result accuracy. Therefore, improvements are needed to address these issues. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a vacuum pump cover defect detection device based on machine vision technology.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a vacuum pump cover defect detection device based on machine vision technology, comprising a detection box body having a detection chamber and a drive chamber arranged from top to bottom, safety light curtains on both sides of the front end of the detection box body, a first vision camera vertically installed in the middle of the top surface of the detection chamber, and a second vision camera obliquely installed above the rear end of the inner wall of the detection chamber, a clamping rod for clamping the pump cover vertically arranged in the middle of the detection chamber, and an adjustment component placed in the detection chamber and drive chamber below the clamping rod; The detection device is equipped with a region calibration module and a parameter setting module at its terminal. The area calibration module uses the image from the first vision camera as a reference, compares it with the range of movement of the worker's limbs, sets a safe distance, and marks a safety point at the safe distance outside the maximum range of movement of the operating structure. It marks and connects safety points in multiple directions with the center point of the detection box as the center, and marks the area between the safety light curtain and the line connecting the safety points as the safe area. When loading or unloading or adjusting the position, if the limbs pass through the safety light curtain but are still within the safe area, only an alarm is triggered, and the electrical components are not suspended. The parameter setting module limits the exposure time based on the blur pixel formula and ensures that no defects are missed based on the frame rate formula. When there is multi-axis composite motion, it calculates the synthesis speed and adjusts the exposure time. It combines historical motion data to deduce the required exposure time and frame rate of the camera, so as to achieve dynamic matching between camera parameters and motion speed.

[0005] Preferably, the data analysis steps of the region calibration module are as follows: M1: Based on the image data from the first-view camera, determine the range of motion of the worker's limbs when performing loading, unloading, or position adjustment operations, and compare the real-time range of motion of the operating structure with the image of the worker's limb range of motion; set a safe distance. Distance outside the maximum range of real-time activity of the operating structure Mark the location as a safety point; using the center point of the horizontal plane inside the detection box as the center, mark safety points in multiple directions at the location of the safety light curtain, and connect adjacent safety points. Mark the area between the safety light curtain and the safety point as a safety area. M2: When loading, unloading, or adjusting positions, if a worker's limbs pass through the safety light barrier but remain within the safe area, only a warning will be triggered, and the operation of electrical components will not be paused.

[0006] Preferably, the data analysis steps of the parameter setting module are as follows: N1: Based on the fuzzy pixel formula To prevent motion blur, the exposure time must be satisfied. According to the frame rate formula To ensure no defects are missed, the frame rate must be met. ;in The maximum linear velocity of the pump cover surface relative to the camera. For camera exposure time, The physical size corresponding to a single pixel of the camera. For camera frame rate, The effective overlap length of the camera's field of view in the direction of motion; N2: Calculate the combined velocity when the pump cover rotates, lifts, and swings simultaneously. ,in For the speed of ascent and descent, Angular velocity of rotation Let be the radius of rotation at the location of the defect. This refers to the tangential velocity during the oscillation; the exposure time must meet this requirement. Based on the movement speed of the stepper motor, drive motor, and electric cylinder in the corresponding time period in historical data, the required exposure time and frame rate data of the first vision camera and the second vision camera are deduced.

[0007] Preferably, the adjustment assembly includes an adjustment platform installed below the clamping rod, the adjustment platform having an installation chamber, a rotating column installed on the top surface of the adjustment platform, a hinge groove on the bottom surface of the adjustment platform, a connecting hole in the middle of the top surface of the rotating column communicating with the installation chamber, a rotating groove adapted to the rotating column on the bottom surface of the clamping rod, a stepper motor installed in the installation chamber, and the output shaft of the stepper motor passing through the connecting hole and fixedly connected to the bottom surface of the clamping rod.

[0008] Preferably, a positioning post with a matching hinge groove is hinged below the adjustment platform. A positioning groove is provided on one side of the front end of the positioning post. A fixed platform is provided on one side of the positioning groove. A drive motor is installed on the top surface of the fixed platform. A spline groove penetrating the hinge groove and the positioning post is provided on one side of the adjustment platform. A spline block is slidably connected in the spline groove. The spline block is placed in the section of the spline groove opened by the positioning post and has a cylindrical structure. The output shaft of the drive motor is fixedly connected to one end of the spline block.

[0009] Preferably, an electric push cylinder is provided below the positioning column and placed in the driving chamber. The output shaft of the electric push cylinder is placed in the detection chamber, and the output shaft of the electric push cylinder is connected to the outer side of the lower end of the positioning column through a coupling.

[0010] Preferably, the clamping rod has a clamping chamber and a power supply chamber arranged from top to bottom in its inner cavity, and multiple clamping slots communicating with the clamping chambers are equidistantly opened on the upper outer side of the clamping rod. A threaded block is installed below the clamping slot and placed at the lower outer side of the clamping rod. A positioning block that matches the threaded block is threadedly connected to the outer side of the clamping rod. A servo motor is vertically installed in the power supply chamber. The output shaft of the servo motor is placed in the clamping chamber and is connected to a lead screw through a coupling.

[0011] Preferably, the clamping groove has limiting grooves on both sides for placing the clamping rod, the lead screw is threadedly connected to a moving block, the outer side of the moving block is equidistantly equipped with a first hinge platform adapted to the clamping groove, and the top surface of the moving block is connected to two locking grooves, the clamping groove is slidably connected with a clamping block adapted to the limiting groove, and a second hinge platform adapted to the first hinge platform is installed at the middle of the near ends of multiple clamping blocks, the inner cavity of the clamping rod is vertically equipped with a locking block with a limiting locking groove, and a support rod is hinged between the first hinge platform and the second hinge platform.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the coordination of the first vision camera, second vision camera, servo motor, stepper motor, drive motor, and electric push cylinder, the automated and stable operation of vacuum pump cover defect detection is achieved; the stepper motor drives the clamping rod to rotate, the drive motor controls the tilt angle swing, and the electric push cylinder achieves height fine adjustment, thus precisely adjusting the pump cover detection angle in multiple dimensions. Combined with the dynamic all-round acquisition of defect images by the first and second vision cameras, the inspection accuracy and work efficiency are improved; the positioning block pre-positioning and the clamping block flexible internal support adapt to the inner hole of pump covers of different specifications. 2. By setting the area calibration module, using the first vision camera image as a reference, the range of motion of the worker's limbs is compared with the range of motion of the operating structure. A safe distance is set and a safe point is marked. The area between the safety light curtain and the line connecting the safe point is marked as the safe zone. When loading, unloading or adjusting the position, if the worker's limbs pass through the safety light curtain but are still within the safe zone, only an early warning is triggered, without stopping the electrical components. This effectively avoids the problem of frequent shutdowns caused by the traditional safety light curtain due to the brief entry of limbs. Under the premise of ensuring operational safety, the detection interruption is greatly reduced, and the continuity and efficiency of the detection operation are improved. 3. By setting parameters in the module, the camera exposure time is limited according to the fuzzy pixel formula, and the frame rate formula ensures that no defects are missed. When the pump cover undergoes multi-axis composite movements such as rotation, lifting, and swinging, the synthesis speed is calculated and the exposure time is dynamically adjusted. At the same time, the required exposure time and frame rate of the first and second vision cameras are deduced by combining historical motion data, so as to achieve dynamic matching between camera parameters and motion speed. This effectively prevents image blurring or missed shots caused by mismatch between motion speed and camera frame rate, and significantly improves image acquisition quality and the accuracy of defect detection. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure proposed in this invention; Figure 2 This is a half-sectional view of the overall structure proposed in this invention; Figure 3 This is a schematic diagram of the positioning block structure proposed in this invention; Figure 4 The present invention proposes Figure 2 Enlarged diagram of part A in the middle; Figure 5 The present invention proposes Figure 3 Enlarged diagram of section B; Figure 6 The present invention proposes Figure 2 Enlarged diagram of section C; Figure 7 This is a flowchart of the system proposed in this invention.

[0014] The following are the components listed in the diagram: 1. Detection box body; 2. First vision camera; 3. Second vision camera; 4. Clamping rod; 5. Positioning block; 6. Servo motor; 7. Lead screw; 8. Locking block; 9. Moving block; 10. Clamping block; 11. Support rod; 12. Adjustment table; 13. Stepper motor; 14. Positioning column; 15. Drive motor; 16. Spline block; 17. Electric push cylinder; 18. Safety light curtain. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] Example 1: See Figures 1 to 6 The vacuum pump cover defect detection device based on machine vision technology of the present invention includes a detection box body 1 with a detection chamber and a drive chamber arranged from top to bottom. The detection box body 1 serves as the support structure for the entire device. The drive chamber should also be equipped with a control system. The outer side of the detection box body 1 is equipped with a hinged door, a three-color light, and a touch screen. Safety light curtains 18 are provided on both sides of the front end of the detection box body 1 to protect personnel from injury if their limbs enter the detection chamber during the detection process. A first vision camera 2 is vertically installed in the middle of the top surface of the detection chamber to detect the top of the pump cover and the bottom of the pump cover after it is reversed. A second vision camera 3 is obliquely installed above the rear end of the inner wall of the detection chamber to detect some details of the top of the pump cover and the details of the bottom of the pump cover after it is reversed. A clamping rod 4 is vertically installed in the middle of the detection chamber to clamp pump covers of different specifications and diameters. An adjustment component is located below the clamping rod 4 and placed in the detection chamber and the drive chamber.

[0017] Reference Figures 2 to 5As shown, the inner cavity of the clamping rod 4 is provided with a clamping chamber and a power supply chamber from top to bottom. Multiple clamping slots connecting the clamping chambers are equidistantly opened on the upper outer side of the clamping rod 4. A threaded block is installed below the clamping slots on the lower outer side of the clamping rod 4. A positioning block 5, adapted to the threaded block, is threadedly connected to the outer side of the clamping rod 4. The positioning block 5 allows workers to directly pass through the clamping rod 4 when loading materials. After the subsequent startup program is initiated, the clamping block 10 of the clamping rod 4 clamps the material pump cover. At this time, the positioning block 5 completes its work. This process ensures that workers' limbs do not start when passing through the safety light curtain 18 during loading, thus ensuring the safety of workers during the loading process. A servo motor 6 is vertically installed in the power supply chamber. The output shaft of the servo motor 6 is located in the clamping chamber, allowing the servo motor 6 to drive the lead screw 7 to rotate. The output shaft of the servo motor 6 is connected to the lead screw 7 via a coupling, allowing the lead screw 7 to drive the moving block 9 to lift. The clamping groove is provided with limiting grooves on both sides of the clamping rod 4. The screw rod 7 is threadedly connected to the moving block 9. The first hinge platform adapted to the clamping groove is installed at equal intervals on the outer side of the moving block 9. The top surface of the moving block 9 is connected to two locking grooves. The moving block 9 facilitates the movement of the clamping block 10 outward in conjunction with the support rod 11 during the subsequent lifting process. The inner diameter of the pump cover is supported, and the pump cover is limited. The locking groove of the moving block 9 should be used in conjunction with the locking block 8 to prevent rotation during the lifting process. The clamping block 10 adapted to the limiting groove is slidably connected in the clamping groove. The clamping block 10 facilitates the movement of the inner diameter of different pump covers. The middle of the near ends of multiple clamping blocks 10 is equipped with a second hinge platform adapted to the first hinge platform. The locking block 8 with the limiting locking groove is vertically installed in the inner cavity of the clamping rod 4. The first hinge platform and the second hinge platform are hinged together by the support rod 11. The support rod 11 facilitates the connection between the moving block 9 and the clamping block 10.

[0018] Example 2: The technical solution is basically the same as that of Example 1, except that, as Figures 2 to 5As shown, the adjustment assembly includes an adjustment platform 12 installed below the clamping rod 4. The adjustment platform 12 has an installation chamber, and a rotating column is mounted on its top surface. A hinge groove is provided on the bottom surface of the adjustment platform 12. The adjustment platform 12 facilitates the use of the rotating column to limit the clamping rod 4. This, in conjunction with a stepper motor 13 within the subsequent installation chamber, drives the clamping rod 4 to rotate 360°. The stepper motor 13 should reset after rotating 360°. The stepper motor 13 should be equipped with an encoder. The type of the stepper motor 13... The part number is 2HSS57-C / 2HSS86H-C; a connecting hole is opened in the middle of the top surface of the rotating column, which connects to the installation chamber; a rotating groove adapted to the rotating column is opened on the bottom surface of the clamping rod 4; a stepper motor 13 is installed in the installation chamber; the output shaft of the stepper motor 13 passes through the connecting hole and is fixedly connected to the bottom surface of the clamping rod 4; a positioning column 14 adapted to the hinge groove is hinged below the adjusting platform 12; a positioning groove is opened on one side of the front end of the positioning column 14; a fixed platform is provided on one side of the positioning groove; a drive motor 15 is installed on the top surface of the fixed platform; and the drive motor... The motor 15 facilitates the driving of the spline block 16, thereby driving the adjustment table 12 to swing back and forth relative to the positioning column 14. The swing angle of the drive motor 15 should be less than 60°, and the drive motor 15 should be equipped with a corresponding encoder. A spline groove penetrating the hinge slot and the positioning column 14 is laterally opened on one side of the adjustment table 12. The spline block 16 is slidably connected within the spline groove. The spline block 16, located within the spline groove section of the positioning column 14, has a cylindrical structure. The output shaft of the drive motor 15 is fixedly connected to one end of the spline block 16. Below the positioning column 14 is an electric push cylinder 17 placed in the drive chamber. The output shaft of the electric push cylinder 17 is placed in the detection chamber, and the output shaft of the electric push cylinder 17 is connected to the outer side of the lower end of the positioning column 14 through a coupling. The electric push cylinder 17 facilitates the lifting and fine adjustment of the positioning column 14, the adjustment table 12 and the clamping rod 4 during the visual inspection process. The lifting and lowering adjustment of the electric push cylinder 17, the swing adjustment of the drive motor 15 and the rotation adjustment of the stepper motor 13 are all interactively adjusted during the visual inspection process due to the same batch of products being inspected.

[0019] Working principle: When using this invention, after the staff has finished inspecting the equipment, the equipment is powered on. Then the staff opens the hinged door of the main body 1 of the testing box and puts the pump cover of the vacuum pump to be tested into the clamping rod 4. The positioning block 5 is used to initially lift and position the pump cover. During the loading process, the staff's limbs pass through the safety light curtains 18 on both sides of the front end of the main body 1 of the testing box. The safety light curtains 18 immediately trigger the safety interlock mechanism, suspending the operation of all electrical components in the testing chamber and the drive chamber. After the staff's limbs leave the testing area of ​​the safety light curtains 18, the safety light curtains 18 reset, the staff closes the hinged door, and the device automatically enters the testing preparation state.

[0020] At this time, the servo motor 6 installed in the power supply chamber of the clamping rod 4 starts and drives the lead screw 7 to rotate. Since the locking block 8 is stuck in the locking groove of the moving block 9, the moving block 9 is restricted from rotating in the circumferential direction, so that the moving block 9 can only move up and down. When the moving block 9 moves upward, the clamping block 10 is pushed outward by the support rod 11, so that the clamping block 10 extends smoothly along the limiting groove of the clamping rod 4 and the inner hole of the pump cover is clamped. After the clamping is in place, the servo motor 6 self-locks. Subsequently, during the inspection, the electric push cylinder 17 in the drive chamber is activated to drive the positioning column 14, the adjusting platform 12, and the clamping rod 4 to rise and fall as a whole, adjusting the inspection height of the pump cover. The stepper motor 13 installed in the chamber of the adjusting platform 12 is also activated, driving the clamping rod 4 to rotate 360° around the rotating column, so that all circumferential surfaces of the pump cover enter the visual inspection range in sequence. When angle adjustment is required, the drive motor 15 installed on one side of the positioning column 14 is activated to drive the spline block 16 to rotate, thereby driving the adjusting platform 12 to swing slightly around the hinge slot of the positioning column 14 to achieve the tilt angle adjustment of the pump cover. The first vision camera 2 and the second vision camera 3 cooperate to capture images and collect the overall defect information of the top surface of the pump cover and the subsequent reverse bottom surface of the pump cover.

[0021] Example 3: See Figure 7 The detection device is equipped with a region calibration module and a parameter setting module at its terminal. The area calibration module uses the image from the first vision camera as a reference, compares it with the range of movement of the worker's limbs, sets a safe distance, and marks a safety point at the safe distance outside the maximum range of movement of the operating structure. It marks and connects safety points in multiple directions with the center point of the detection box as the center, and marks the area between the safety light curtain and the line connecting the safety points as the safe area. When loading or unloading or adjusting the position, if the limbs pass through the safety light curtain but are still within the safe area, only an alarm is triggered, and the electrical components are not suspended. The parameter setting module limits the exposure time based on the blur pixel formula and ensures that no defects are missed based on the frame rate formula. When there is multi-axis composite motion, it calculates the synthesis speed and adjusts the exposure time. It combines historical motion data to deduce the required exposure time and frame rate of the camera, so as to achieve dynamic matching between camera parameters and motion speed. The image data acquired in real time by the first visual camera 2 and the second visual camera 3 are processed in grayscale, and the grayscale image is segmented according to the size of the pixel block, into... The image data consists of several identical grayscale blocks, numbered according to their row and column numbers on the grayscale image. The acquired image data is sorted by acquisition time, and the corresponding numbered grayscale blocks within a single image acquired at the same time are further analyzed. Average the gray values and standard deviation The calculation, and the mean obtained from the calculation. and standard deviation Range of grayscale data The setting compares the corresponding grayscale value data with the corresponding grayscale value fluctuation range, marks the corresponding grayscale value data that is outside the fluctuation range as an outlier, and records the number of outliers. ; like If the grayscale data is abnormal, the grayscale data will be detected again. For the preset proportional coefficient ( );like If outliers are removed, the remaining grayscale data after outlier removal is averaged. The calculation, and the mean obtained from the calculation. This serves as the grayscale value data detected at the corresponding time. If, upon re-detection, the grayscale value data is still deemed abnormal, then the corresponding numbered grayscale block is determined to be abnormal. After determining the grayscale values ​​of all numbered grayscale blocks on the grayscale image, the number of abnormal grayscale blocks is calculated. Record and take the quantity The image with the smallest grayscale value is the image to be analyzed; After determining the image for analysis, the coverage area of ​​the safety light curtain 18 is determined by its position inside the detection box body 1. Historical data is retrieved, and the real-time activity range of the operating structure during loading / unloading and position adjustment operations is marked in the image data at the corresponding time. Using the image data from the first vision camera 2 as a benchmark, the range of motion of the worker's limbs during the corresponding operation is determined. The real-time activity range of the operating structure and the range of motion of the worker's limbs are compared in the image to set a safety distance. The maximum distance outside the real-time activity range of the operating structure Mark the location as a safety point; using the center point of the horizontal plane inside the detection box 1 as the center, mark safety points in multiple directions at the location of the safety light curtain 18, and connect adjacent safety points. Mark the area between the safety light curtain 18 and the safety point line as a safety zone; when loading, unloading and adjusting the position, if the worker's limbs pass through the safety light curtain 18 and are within the safety zone, the electrical components will not be paused, only a warning will be triggered.

[0022] To prevent image blurring or missed shots during the movement of the pump cover, the first and second vision cameras need to have their parameters set in advance based on the maximum movement speed and the movement speed limited. Blur pixels = distance the object travels during the exposure time ÷ physical size of each pixel; maximum allowable blur pixels ,in The maximum linear velocity of the pump cover surface relative to the camera. For camera exposure time, This refers to the physical size corresponding to a single pixel in the camera; to prevent motion blur, the following must be met: ; The distance an object moves between two adjacent frames = motion speed ÷ frame rate; the distance the pump cover surface moves between two frames. , For camera frame rate; to ensure no defects are missed, the following must be met: , The effective overlap length of the camera's field of view in the direction of motion; When the pump cover rotates, lifts, and swings simultaneously, the combined velocity in the three directions... ,in For the speed of ascent and descent, Angular velocity of rotation Let be the radius of rotation at the location of the defect. This represents the tangential velocity during the oscillation; the exposure time must satisfy the following conditions: ; Based on historical data analysis of the movement speed of stepper motors, drive motors, and electric cylinders within corresponding time periods, the required exposure time and frame rate data for the first and second vision cameras are deduced from the movement speed within the corresponding time periods.

[0023] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vacuum pump cover defect detection device based on machine vision technology, comprising a detection box body (1) having a detection chamber and a drive chamber arranged from top to bottom, and safety light curtains (18) on both sides of the front end of the detection box body (1), characterized in that: A first vision camera (2) is vertically installed in the middle of the top surface of the detection chamber, and a second vision camera (3) is obliquely installed above the rear end of the inner wall of the detection chamber. A clamping rod (4) for clamping the pump cover is vertically provided in the middle of the detection chamber. An adjustment component is provided below the clamping rod (4) and placed in the detection chamber and the drive chamber. The detection device is equipped with a region calibration module and a parameter setting module at its terminal. The area calibration module uses the image of the first vision camera (2) as a reference, compares the range of movement of the worker's limbs, sets a safe distance, marks a safe point at the safe distance outside the maximum range of movement of the operating structure, marks and connects multiple safe points with the center point of the detection box body (1) as the center, and marks the area between the safety light curtain (18) and the line connecting the safe points as the safe area; when loading or unloading or adjusting the position, if the limb passes through the safety light curtain (18) but is still in the safe area, only an alarm is triggered, and the electrical components are not suspended; The parameter setting module limits the exposure time based on the blur pixel formula and ensures that no defects are missed based on the frame rate formula. When there is multi-axis composite motion, it calculates the synthesis speed and adjusts the exposure time. It combines historical motion data to deduce the required exposure time and frame rate of the camera, so as to achieve dynamic matching between camera parameters and motion speed.

2. The vacuum pump cover defect detection device based on machine vision technology according to claim 1, characterized in that: The data analysis steps for the region calibration module are as follows: M1: Based on the image data of the first vision camera (2), determine the range of motion of the worker's limbs when performing loading / unloading or position adjustment operations, and compare the real-time range of motion of the operating structure with the image of the range of motion of the worker's limbs; set a safe distance. Distance outside the maximum range of real-time activity of the operating structure Mark the location as a safety point; take the center point of the horizontal plane inside the detection box body (1) as the center, mark the safety points in multiple directions at the location of the safety light curtain (18), and connect adjacent safety points. Mark the area between the safety light curtain (18) and the safety point as a safety area. M2: When loading, unloading or adjusting positions, if the worker's limbs pass through the safety light curtain (18) but are still within the safe area, only a warning will be triggered, and the electrical components will not be suspended.

3. The vacuum pump cover defect detection device based on machine vision technology according to claim 1, characterized in that: The data analysis steps for the parameter setting module are as follows: N1: Based on the fuzzy pixel formula To prevent motion blur, the exposure time must be satisfied. According to the frame rate formula To ensure no defects are missed, the frame rate must be met. ;in The maximum linear velocity of the pump cover surface relative to the camera. For camera exposure time, The physical size corresponding to a single pixel of the camera. For camera frame rate, The effective overlap length of the camera's field of view in the direction of motion; N2: Calculate the combined velocity when the pump cover rotates, lifts, and swings simultaneously. ,in For the speed of ascent and descent, Angular velocity of rotation Let be the radius of rotation at the location of the defect. This refers to the tangential velocity during the oscillation; the exposure time must meet this requirement. Based on the movement speed of the stepper motor (13), drive motor (15), and electric cylinder (17) in the corresponding time period in the historical data, the exposure time and frame rate data required for the first vision camera (2) and the second vision camera (3) are deduced.

4. The vacuum pump cover defect detection device based on machine vision technology according to claim 1, characterized in that: The adjustment assembly includes an adjustment platform (12) installed below the clamping rod (4). The adjustment platform (12) has an installation chamber, and a rotating column is installed on the top surface of the adjustment platform (12). The bottom surface of the adjustment platform (12) has a hinge groove. The top surface of the rotating column has a connecting hole in the middle that connects to the installation chamber. The bottom surface of the clamping rod (4) has a rotating groove that adapts to the rotating column. A stepper motor (13) is installed in the installation chamber. The output shaft of the stepper motor (13) passes through the connecting hole and is fixedly connected to the bottom surface of the clamping rod (4).

5. The vacuum pump cover defect detection device based on machine vision technology according to claim 4, characterized in that: The adjustment platform (12) is hinged to a positioning column (14) with a matching hinge groove. The positioning column (14) has a positioning groove on one side of its front end. A fixed platform is provided on one side of the positioning groove. A drive motor (15) is installed on the top surface of the fixed platform. A spline groove that passes through the hinge groove and the positioning column (14) is opened laterally on one side of the adjustment platform (12). A spline block (16) is slidably connected in the spline groove. The spline block (16) is placed in the section of the spline groove opened by the positioning column (14) and is cylindrical. The output shaft of the drive motor (15) is fixedly connected to one end of the spline block (16).

6. The vacuum pump cover defect detection device based on machine vision technology according to claim 5, characterized in that: Below the positioning column (14) is an electric push cylinder (17) placed in the driving chamber. The output shaft of the electric push cylinder (17) is placed in the detection chamber, and the output shaft of the electric push cylinder (17) is connected to the outer side of the lower end of the positioning column (14) through a coupling.

7. The vacuum pump cover defect detection device based on machine vision technology according to claim 1, characterized in that: The clamping rod (4) has a clamping chamber and a power supply chamber in its inner cavity from top to bottom. The upper outer side of the clamping rod (4) has multiple clamping slots that connect to the clamping chambers at equal intervals. A threaded block is installed below the clamping slot and placed at the lower outer side of the clamping rod (4). A positioning block (5) that matches the threaded block is threadedly connected to the outer side of the clamping rod (4). A servo motor (6) is vertically installed in the power supply chamber. The output shaft of the servo motor (6) is placed in the clamping chamber and the output shaft of the servo motor (6) is connected to the lead screw (7) through a coupling.

8. The vacuum pump cover defect detection device based on machine vision technology according to claim 7, characterized in that: The clamping groove is provided with limiting grooves on both sides of the clamping rod (4). The lead screw (7) is threadedly connected to the moving block (9). The moving block (9) is equidistantly installed with the first hinge platform adapted to the clamping groove on the outer side. The top surface of the moving block (9) is connected to two locking grooves. The clamping groove is slidably connected with the clamping block (10) adapted to the limiting groove. The middle of the near end of the multiple clamping blocks (10) is equipped with the second hinge platform adapted to the first hinge platform. The inner cavity of the clamping rod (4) is vertically installed with the locking block (8) with the limiting locking groove. The first hinge platform and the second hinge platform are hinged together with the support rod (11).

Images