Bearing roundness detection device and detection method

Abstract

The present invention relates to the field of detection technology, and specifically to a bearing roundness detection device and detection method. The bearing roundness detection device comprises: a support frame, used to form a support frame; an image acquisition component, which is installed on the support frame and is located directly above the bearing, and the image acquisition component is used to shoot the bearing and obtain the photographed image. A controller is connected to the position sensor, the conveyor belt, and the image acquisition component by signal. The controller is used to control the image acquisition component to shoot the bearing to obtain the photographed image; then a plane coordinate system is constructed, and the photographed image is implanted into the plane coordinate system; the photographed image is processed to obtain multiple center points and their coordinates; the coordinates of the center of gravity of each center point are calculated; and the discreteness of the center of gravity of each center point is calculated. The present invention determines the roundness of the bearing by image processing, and the determination method is simple and accurate, and the detection cycle is fast, the detection efficiency is high, and full inspection is achieved.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a bearing roundness detection device and a detection method. Background Art

[0002] Bearings are mechanical components used to support and reduce friction, and are widely used in various machines and equipment and industrial production fields. Their main function is to reduce friction and improve transmission efficiency by rolling instead of sliding, while also being able to withstand large radial and axial loads. According to different working principles and structural forms, bearings can be divided into many types, such as deep groove ball bearings, thrust ball bearings, tapered roller bearings, self-aligning ball bearings, angular contact ball bearings, self-lubricating bearings, combined bearings, etc. Common bearing characteristics are as follows: Reduce friction: Bearings reduce friction and improve transmission efficiency by rolling instead of sliding. Reduce energy loss: Due to the small rolling friction coefficient, bearings can convert most of the friction into heat energy and dissipate it through heating elements, reducing the power loss of the system. Transmit large loads: Bearings can withstand large radial and axial loads and have a long service life. Strong adaptability: Bearings are suitable for various types of mechanical equipment, and have strong adaptability, and can maintain stable operation under different environments and working conditions. The scope of use of bearings is very wide, mainly including automobiles, motorcycles, ships, aircraft, locomotives, household appliances, agricultural machinery and other fields. With the continuous development of my country's economy and the acceleration of industrialization, the demand for bearings has increased year by year, and the requirements for bearing materials, manufacturing technology and performance have become increasingly higher. Therefore, researching and developing high-performance, high-reliability and low-noise bearing products is of great significance to improving the competitiveness of my country's manufacturing industry and ensuring national security.

[0003] The roundness of a bearing refers to the radius of the trajectory formed when the spherical surface on the inner and outer rings of the bearing rolls radially. It describes the error distribution of the inner and outer rings of the bearing in the radial direction. The measurement of the roundness of a bearing usually uses high-precision detection equipment such as a three-dimensional coordinate measuring machine or an optical projector. By real-time monitoring of the rolling of the inner and outer rings, the average value and standard deviation of the radial error are calculated, and then the evaluation index of the roundness of the bearing is obtained. The roundness of the bearing is an important indicator to measure the precision of the bearing and directly affects the performance and service life of the bearing. Generally speaking, the smaller the roundness of the bearing, the more uniform the radial error distribution and the relatively small radial runout. Conversely, the larger the radial error is, which affects the processing accuracy and service life of the equipment. In practical applications, the size of the roundness of the bearing can be improved by adjusting process parameters, optimizing design solutions, and selecting high-quality materials. In addition, the testing and analysis of the roundness of the bearing also contributes to the online monitoring of the bearing quality, as well as the research on bearing fault diagnosis and maintenance.

[0004] The existing bearing roundness detection is manually performed using a detection ruler, which is difficult and inefficient, making production quality control difficult. For example, CN103411515A discloses a bearing roundness detection device, CN114812478A discloses an automatic bearing roundness detection device, and CN112113532A discloses a roundness instrument for detecting bearings. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a bearing roundness detection device, which is used to detect the roundness of the bearing and determine whether the roundness of the bearing is qualified. The bearing roundness detection device comprises:

[0006] The support frame is used to form a support frame. The support frame can be designed as needed. The support frame can be a support table structure with a flat top, or a bracket structure for installing a conveyor belt. When the support frame is a table structure, it needs to be placed manually or by a robot. This requires manual or robot cooperation for testing, which will increase manpower or equipment costs. It is more suitable for random inspection or large bearing testing. The details are not repeated here.

[0007] The image acquisition component is installed on the support frame and is located directly above the bearing. It is used to photograph the bearing and obtain the photographed image. A horizontal gantry can be fixedly set above the support frame. The image acquisition component can be installed on the gantry and shoot vertically downward to obtain the photographed image. The image acquisition component can be a camera or a high-frequency camera. In this way, when we place the bearing, the axis of the bearing is perpendicular to the top plane of the conveyor belt. Since the height of the conveyor belt and the length of the bearing are fixed, the position of the image acquisition component does not need to be changed after it is designed, so the image acquisition component here can be fixed.

[0008] The controller is connected to the position sensor, the conveyor belt, and the image acquisition device by signal, which can be a wired connection or a wireless connection. The controller controls the image acquisition device to capture the bearing to obtain a captured image, then construct a plane coordinate system, and implant the captured image into the plane coordinate system; process the captured image to obtain multiple center points and their coordinates; calculate the coordinates of the center of gravity of each center point (x Q ,y Q ); calculate the dispersion D of each center point relative to the center of gravity; then determine whether the dispersion D is greater than a preset standard dispersion D mark, if so, it is judged as unqualified, if not, it is judged as qualified.

[0009] Preferably: the specific structure of the support frame may include a relatively arranged support frame, a support leg is arranged at the bottom of the support frame, a support gasket is fixedly connected to the bottom of the support leg, a mounting hole is opened on the support gasket, and it can be installed on the ground by passing a fixing bolt through the mounting hole, and can be connected to the production line.

[0010] Preferably, a position sensor is installed on the support frame, and the position sensor is used to sense the position of the bearing and send a sensing signal. The position sensor can be an infrared sensor or a photosensitive sensor, among which the photosensitive sensor is preferred and has more accurate positioning.

[0011] Preferably: the light-sensitive sensor may include a light source generator and a light source receiver, which are respectively arranged on both sides of the conveyor belt, wherein the light source generator and the light source receiver are respectively higher than the belt height and lower than the top height of the bearing when it is placed. When the bearing is conveyed to the specified position, the bearing can block the light source emitted by the light source generator and hinder the light source receiver from receiving it, thereby sensing the position of the bearing. By arranging the light source generator and the light source receiver, the positioning is accurate and sensitive.

[0012] Preferably: the support frame is in a dark space, and a lighting lamp is arranged on the gantry, through which the image lines and the separation of the bearing end can be highlighted, and the lighting lamp can be an annular light belt, the diameter of which is larger than the inner diameter of the bearing and smaller than the outer diameter of the bearing, so that the outer ring of the inner ring and the inner ring of the outer ring can be highlighted. The lighting lamp can be fixedly arranged on the gantry and located outside the image acquisition part, and the lighting lamp can illuminate from above and around the bearing, so that the edge of the bearing can be highlighted.

[0013] Preferably: a plurality of placement stations can be provided on the conveyor belt, the number of the placement stations can be determined according to the detection rhythm and the circumference of the conveyor belt, and the placement stations are evenly arranged on the conveyor belt. The setting of the placement stations facilitates the placement of the bearings, thereby controlling the detection rhythm of the bearings and the uniformity of the rhythm, and avoiding the uncontrollable rhythm caused by the non-uniform placement spacing of each bearing. The upper surface of the placement station can be set as an anti-skid layer with a large friction coefficient to prevent the bearings from moving on the placement station when the conveyor belt is running. The upper surface of the placement station can be set as a separation color, so as to facilitate the separation of the bearing and the background color when shooting image processing, and the separation color can be blue, black, etc.

[0014] Preferably: the controller receives the sensing signal sent by the position sensor; and calculates and obtains the bearing detection interval time period t; the controller controls the conveyor belt to stop running after the detection interval time period t.

[0015] Preferably: the detection interval time period calculation method includes: obtaining the conveyor belt transmission speed v and the maximum deceleration a, wherein the transmission speed v is the current conveyor belt transmission speed. The maximum deceleration a is not the maximum deceleration of the device, but the maximum deceleration that can be achieved to ensure the detection beat, which can be obtained through experience or by calculation. The detection interval time period Wherein L is the distance between the position sensor and the center point of the image acquisition component, and r is the radius of the bearing.

[0016] Preferably, the maximum deceleration a calculation method may include: calculating and obtaining Where F is the static friction force when the bearing is placed, which can be obtained through experiments, and m is the mass of the bearing. For bearings of the same model, its mass can be considered constant. Then determine whether a' is greater than the maximum acceleration a of the conveyor belt. 标 , if yes, then the maximum deceleration a=a 标 , if not, then the maximum deceleration a=a'. Maximum acceleration a 标 Can be obtained according to device parameters.

[0017] Preferred: The center of gravity Where i is the number of the center point, I is the total number of center points, i=1,2,┈,I.

[0018] Preferred: Dispersion of the center point relative to the center of gravity Where ɑ is the device parameter.

[0019] Preferably, the method for obtaining the center point may include: separating the image of the bearing from the photographed image to obtain the image of the bearing, and then calculating the gray value of the image of the bearing to obtain the bright and dark point coordinates M j , where j is the number of the bright and dark points, and then calculate to obtain M j-1 With M j The distance L j-1 , and determine L j-1 Is it less than a preset standard distance L? 标 If yes, connect the lines, and finally connect the ends to get the circular edge line. If no, do not connect the lines. A general bearing can include multiple concentric circles. This method can connect the light and dark points on the same circumference, and then get three light and dark points on the same circumference at random. Then get the three light and dark points to determine the circle and get the center of the circle as the center point.

[0020] Preferably, the method for obtaining light and dark points may include: calculating and obtaining the grayscale value of the bearing image, then obtaining coordinate points whose grayscale values ​​are less than a standard grayscale value, and then defining these coordinates as light and dark points.

[0021] Preferably: the support frame includes a transmission roller, a driving member and a belt piece. Two transmission rollers are provided and are located at both ends of the support frame. The transmission rollers are rotatably provided between the support frames. The belt piece is wound around the two transmission rollers. One of the transmission rollers is connected to a driving member. The driving member drives the transmission roller to rotate, so that the belt piece rolls on the support frame to complete the transmission of the bearing. The specific structure is not described in detail here. The driving member may include a motor, an incomplete gear and a transmission gear. The transmission gear is coaxially fixedly connected to the transmission roller. An incomplete gear is rotatably provided on the support frame. A motor is installed on the support frame. The output shaft of the motor is coaxially fixedly connected to the incomplete gear. The motor drives the incomplete gear to rotate. The tooth pattern on the incomplete gear intermittently meshes with the transmission gear, thereby realizing intermittent transmission of the conveyor belt. The tooth pattern on the incomplete gear needs to be consistent with the detection rhythm. The specific structure is not described in detail here. Thus, intermittent detection is completed.

[0022] The present invention also proposes a bearing roundness detection method, comprising the following steps:

[0023] S1, receiving the sensing signal sent by the position sensor;

[0024] S2, calculate and obtain the bearing detection interval time period t;

[0025] S3, control the conveyor belt to stop running after the detection interval time period t;

[0026] S4, the controller controls the image acquisition component to photograph the bearing to obtain a photographed image;

[0027] S5, then construct a plane coordinate system, and embed the captured image into the plane coordinate system;

[0028] S6. Processing the captured image to obtain multiple center points and their coordinates;

[0029] S7, calculate the coordinates of the center of gravity of each center point (x Q ,y Q );

[0030] S8, calculating and obtaining the dispersion D of each center point relative to the center of gravity point;

[0031] S9, then determine whether the discreteness D is greater than a preset standard discreteness D 标 If yes, it is judged as unqualified, if no, it is judged as qualified.

[0032] The technical effects and advantages of the present invention are as follows: Since there will be a bright circle on the top edge of the bearing under annular illumination, it can be easily separated from the image of the bearing and is consistent with the roundness of the bearing, thereby making it possible to implement the detection of the device, and the detection is simple and accurate. The present invention can determine the roundness of the bearing by image processing, and the determination method is simple and accurate, the operation method is simple, and intelligent control can be achieved. The detection cycle is fast, the detection efficiency is high, and full inspection can be achieved. By obtaining the center point through this method, the light and dark points on the same circumference can be evaluated, and the light and dark points on different circumferences can also be determined, and the determination range is wide and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural schematic diagram of Example 1 of a bearing roundness detection device proposed by the present invention.

[0034] Figure 2 This is a structural schematic diagram of embodiment 2 of a bearing roundness detection device proposed by the present invention.

[0035] Figure 3 The present invention is a flowchart of a bearing roundness detection method.

[0036] Figure 4 This is a flow chart of a method for obtaining the maximum deceleration in Embodiment 1 of a bearing roundness detection device proposed by the present invention.

[0037] Figure 5 This is a flow chart of a method for obtaining a center point in Embodiment 1 of a bearing roundness detection device proposed by the present invention.

[0038] Explanation of the reference numerals: support frame 1, placement station 2, conveyor belt 3, bearing 4, position sensor 5, image acquisition component 6, transmission gear 7, incomplete gear 8, motor 9. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0040] Example 1

[0041] refer to Figure 1In this embodiment, a bearing roundness detection device is proposed, which is used to detect the roundness of the bearing and determine whether the roundness of the bearing is qualified. The bearing roundness detection device includes:

[0042] The support frame 1 is used to form a support frame. The support frame 1 can be designed as needed. The support frame 1 can be a support table structure with a flat top, or a bracket structure for installing a conveyor belt 3. When the support frame 1 is a desktop structure, it needs to be placed manually or by a manipulator. This kind of detection requires manual or manipulator cooperation, which will increase the manpower or equipment cost. It is more suitable for random inspection or large-scale bearing detection. The specific details are not repeated here. In this embodiment, the support frame 1 is used as an example of a bracket structure for installing a conveyor belt 3. At this time, the specific structure of the support frame 1 may include a relatively arranged support frame, a support leg is provided at the bottom of the support frame, and a support gasket is fixedly connected to the bottom of the support leg. The support gasket is provided with a mounting hole, which can be installed on the ground through a fixing bolt through the mounting hole, and can be docked with the production line to inspect the bearing 4. Of course, random inspection or full inspection can be performed by design, and the specific details are not repeated here. A conveyor belt 3 is provided on the support frame 1, and the conveyor belt 3 is used to convey the bearing 4. In actual use, transmission rollers are respectively provided at both ends of the support frame 1, and the transmission rollers are rotatably provided between the support frames. The belt is wound around the two transmission rollers, and one of the transmission rollers is connected to a driving member, which drives the transmission roller to rotate, so that the belt rolls on the support frame 1 to complete the transmission of the bearing 4. The specific structure is not described in detail here. The structure of the conveyor belt 3 is the prior art, and the specific details are not described here.

[0043] The position sensor 5 can be installed on the support frame 1 to sense the position of the bearing 4 and send a sensing signal. Of course, the position sensor 5 is not a necessary component, and it can also be acquired at high frequency through the image acquisition component 6, but the equipment requirements are high and image distortion is prone to occur. The position sensor 5 can be an infrared sensor or a photosensitive sensor, among which the photosensitive sensor is suitable and the positioning is more accurate. When the position sensor 5 is a photosensitive sensor, the photosensitive sensor can include a light source generating component and a light source receiving component, and the light source generating component and the light source receiving component are respectively arranged on both sides of the conveyor belt 3, wherein the light source generating component and the light source receiving component are respectively higher than the belt height and lower than the height of the top when the bearing 4 is placed. When the bearing 4 is transmitted to the specified position, the bearing 4 can block the light source emitted by the light source generating component, hindering the light source receiving component from receiving, thereby sensing the position of the bearing 4. By setting the light source generating component and the light source receiving component, the positioning is accurate and sensitive.

[0044] The image acquisition member 6 is mounted on the support frame 1 and is located directly above the bearing 4. It is used to shoot the bearing 4 and obtain the shooting image. A horizontal gantry can be fixedly arranged above the support frame 1. The image acquisition member 6 can be mounted on the gantry and shoot vertically downward to obtain the shooting image. The image acquisition member 6 can be a camera or a high-frequency camera. In this way, when we place the bearing 4, the axis of the bearing 4 is perpendicular to the top plane of the conveyor belt 3. Since the height of the conveyor belt 3 and the length of the bearing 4 are fixed, the position of the image acquisition member 6 does not need to be changed after it is designed, so the image acquisition member 6 here can be fixedly set. In order to better obtain the shooting image of the image acquisition member 6, the support frame 1 can be placed in a relatively dark space, and a lighting lamp can be set on the gantry. The image lines and processing separation at the end of the bearing 4 can be highlighted by the lighting lamp. The lighting lamp can be an annular light belt. The diameter of the annular light belt is larger than the inner diameter of the bearing 4 and smaller than the outer diameter of the bearing 4, so that the outer ring of the inner ring and the inner ring of the outer ring can be highlighted. The illumination lamp can be fixedly set on the gantry and be located at the periphery of the image acquisition part 6. The illumination lamp can illuminate from all around the top of the bearing 4, so that the edge of the bearing 4 can be highlighted. The specific details are not repeated here. A plurality of placement stations 2 can be set on the conveyor belt 3. The number of placement stations 2 can be determined according to the detection beat and the circumference of the conveyor belt 3. The general number is 2-10, and the placement stations 2 are evenly arranged on the conveyor belt 3. Of course, this is just a simple example and is not universal. The setting of the placement station 2 facilitates the placement of the bearing 4, thereby controlling the detection beat and the uniformity of the beat of the bearing 4, and avoiding the uncontrollable beat caused by the uneven placement spacing of each bearing 4. The upper surface of the placement station 2 can be set as an anti-slip layer with a large friction coefficient to prevent the bearing 4 from moving on the placement station 2 when the conveyor belt 3 is running. The upper surface of the placement station 2 can be set as a separation color, so as to facilitate the separation of the bearing 4 from the background color when the image is shot and processed. The separation color can be blue, black, etc., which is not repeated here.

[0045] The controller is connected to the position sensor 5, the conveyor belt 3, and the image acquisition component 6 by signal, which can be a wired connection or a wireless connection. The controller is used to receive the sensing signal sent by the position sensor 5, and then calculate the detection interval time period t of the bearing 4. The detection interval time period calculation method includes: obtaining the conveying speed v and the maximum deceleration a of the conveyor belt 3, and the conveying speed v is the current conveying speed of the conveyor belt 3. In the actual operation process, the conveying speed of the conveyor belt 3 is certain. This speed is related to the detection rhythm and is generally controlled at 0.1m / s-0.5m / s. Of course, this is only one case, and other cases are not described in detail here. The maximum deceleration a is not the maximum deceleration of the equipment, but the maximum deceleration that can be achieved to ensure the detection rhythm. It can be obtained through experience and can also be obtained by calculation. Reference Figure 4 , the specific calculation method may include: calculating to obtain Where F is the static friction force when the bearing 4 is placed, which can be obtained through experiments, and m is the mass of the bearing 4. For the same type of bearing 4, its mass can be considered constant. Then determine whether a' is greater than the maximum acceleration a of the conveyor belt 3 标 , if yes, then the maximum deceleration a=a 标 , if not, then the maximum deceleration a=a'. Maximum acceleration a 标 It can be obtained based on the device parameters. Where L is the distance between the position sensor 5 and the center point of the image acquisition component 6, and r is the radius of the bearing 4. L and r can be obtained through measurement or equipment parameters. This calculation method is suitable for the next beat of the bearing 4 sensed by the position sensor 5 for detection, and the details are not repeated here. The controller controls the conveyor belt 3 to stop running after the detection interval time period t. At this time, the bearing 4 enters directly under the image acquisition component 6. The controller controls the image acquisition component 6 to shoot the bearing 4 to obtain a captured image, and then constructs a plane coordinate system and implants the captured image into the plane coordinate system. The controller processes the captured image to obtain multiple center points and center point coordinates, and then calculates the coordinates of the center of gravity of each center point (x Q ,y Q ), where x and y are the coordinates of the plane coordinate system on the x-axis and y-axis respectively. Where i is the number of the center point, I is the total number of center points, i = 1, 2, ┈, I. Then calculate the dispersion of each center point relative to the center of gravity Wherein ɑ is a device parameter, which can be determined according to the clarity of the image acquisition element 6. The clearer the image acquisition element 6, the larger the value. The specific value is generally between 0.1-1. Of course, other values ​​are not excluded. They are not the subject of this application and will not be described in detail here. Then, it is determined whether the discreteness D is greater than a preset standard discreteness D 标 If yes, it is judged as unqualified, if no, it is judged as qualified. In strict bearing roundness, the theoretical dispersion D is 0, that is, all the center points coincide with the center of gravity. Of course, this is only theoretical. The specific standard dispersion D 标 It needs to be determined according to the actual production quality standards, and the details will not be elaborated here. Figure 5 The method for processing the captured image may include: separating the image of the bearing 4 from the captured image to obtain the image of the bearing 4, and then calculating the gray value of the image of the bearing 4 to obtain the bright and dark point coordinates M j , where j is the number of the light and dark points. The numbering can be done in order, that is, the point closest to the light and dark point is numbered as the next light and dark point. The details are not repeated here. Then calculate to obtain Mj-1 With M j The distance L j-1 , and determine L j-1 Is it less than a preset standard distance L? 标 If yes, connect the lines, and finally connect the ends to obtain the circular edge line. If no, do not connect the lines. Generally, the bearing 4 may include multiple concentric circles. This method can connect the light and dark points on the same circumference, and then obtain three light and dark points on the same circumference at will, and then obtain the three light and dark points to determine the circle and obtain the center of the circle as the center point. By obtaining the center point by this method, the light and dark points on the same circumference can be evaluated, and the light and dark points on different circumferences can also be determined. The determination range is wide and accurate. The preset standard distance L 标 The selection can be made according to the density of light and dark points, and the details are not described here. The method for obtaining light and dark points may include: calculating the grayscale value of the image of the bearing 4, and then obtaining the coordinate points whose grayscale values ​​are less than a standard grayscale value, and then defining these coordinates as light and dark points. The standard grayscale value can be designed according to the detection needs, and the details are not described here. Since there will be a bright circle on the top edge of the bearing 4 of the annular lighting lamp, it can be easily separated from the image of the bearing 4 and is consistent with the roundness of the bearing 4, thereby making it possible to realize the detection of the device, and the detection is simple and accurate. The present invention can determine the roundness of the bearing 4 by image processing. The determination method is simple and accurate, the operation method is simple, intelligent control can be realized, and the detection cycle is fast, the detection efficiency is high, and full inspection can be achieved.

[0046] Example 2

[0047] refer to Figure 2 The support frame 1 includes a transmission roller, a driving member and a belt piece. Two transmission rollers are provided and are located at both ends of the support frame 1. The transmission rollers are rotatably provided between the support frames. The belt piece is wound around the two transmission rollers. One of the transmission rollers is connected to a driving member, which drives the transmission roller to rotate, so that the belt piece rolls on the support frame 1 to complete the transmission of the bearing 4. The specific structure is not described in detail here. The driving member may include a motor 9, an incomplete gear 8 and a transmission gear 7. The transmission gear 7 is coaxially fixedly connected to the transmission roller. An incomplete gear 8 is rotatably provided on the support frame 1. A motor 9 is installed on the support frame 1. The output shaft of the motor 9 is coaxially fixedly connected to the incomplete gear 8. The motor 9 drives the incomplete gear 8 to rotate. The teeth on the incomplete gear 8 intermittently mesh with the transmission gear 7, thereby realizing the intermittent transmission of the conveyor belt 3. The teeth on the incomplete gear 8 need to be consistent with the detection beat, which is not described in detail here. Thus, intermittent detection is completed.

[0048] Example 3

[0049] refer to Figure 3In this embodiment, a bearing roundness detection method is proposed, comprising the following steps:

[0050] S1, receiving the sensing signal sent by the position sensor 5;

[0051] S2, calculate and obtain the detection interval time period t of the bearing 4;

[0052] S3, controlling the conveyor belt 3 to stop running after the detection interval time period t;

[0053] S4, the controller controls the image acquisition component 6 to photograph the bearing 4 to obtain a photographed image;

[0054] S5, then construct a plane coordinate system, and embed the captured image into the plane coordinate system;

[0055] S6. Processing the captured image to obtain multiple center points and their coordinates;

[0056] S7, calculate and obtain the coordinates (xQ, yQ) of the center of gravity of each center point;

[0057] S8, calculating and obtaining the dispersion D of each center point relative to the center of gravity point;

[0058] S9. Then determine whether the dispersion D is greater than a preset standard dispersion D mark. If yes, it is determined to be unqualified; if not, it is determined to be qualified.

[0059] Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. The various embodiments in this specification are described in a progressive manner, and the same and similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0060] It should be noted that, unless otherwise specified and limited, terms such as "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, an element defined by the sentence "including one..." does not exclude the existence of other identical elements in the article or device including the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items.

[0061] Those skilled in the art will readily appreciate other embodiments of the invention after considering the specification and practicing the invention invented herein. This application is intended to cover any variations, uses or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art that are not invented by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0062] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A bearing roundness detection device, characterized in that: The bearing roundness detection device comprises: A support frame, used to form a support frame; An image acquisition component is installed on the support frame and is located directly above the bearing. The image acquisition component is used to photograph the bearing and obtain a photographed image; The controller is connected to the position sensor, the conveyor belt, and the image acquisition component by signal. The controller is used to control the image acquisition component to photograph the bearing to obtain a photographed image; then a plane coordinate system is constructed, and the photographed image is implanted into the plane coordinate system; the photographed image is processed to obtain multiple center points and their coordinates; the coordinates of the center of gravity of each center point are calculated (x Q ,y Q ); calculate the dispersion D of each center point relative to the center of gravity; then determine whether the dispersion D is greater than a preset standard dispersion D 标 , if yes, it is judged as unqualified, if no, it is judged as qualified; The method for obtaining the center point includes: separating the image of the bearing from the photographed image to obtain the image of the bearing, and then calculating the gray value of the image of the bearing to obtain the bright and dark point coordinates M j , where j is the number of the bright and dark points, and then calculate to obtain M j-1 With M j The distance L j-1 , and determine L j-1 Is it less than a preset standard distance L? 标 If yes, connect the lines and finally connect the ends to get the edge of the circle. If no, do not connect the lines. Then get three light and dark points at random on the same circle. Then get the three light and dark points to determine the circle and get the center of the circle as the center point. The center of gravity Where i is the number of the center point, I is the total number of center points, i = 1, 2, ┈, I, (x i ,y i ) are the coordinates of the center point numbered i; The dispersion of the center point relative to the center of gravity Where ɑ is the device parameter.

2. A bearing roundness detection device according to claim 1, characterized in that: A position sensor is installed on the support frame, and the position sensor is used to sense the position of the bearing and send a sensing signal.

3. A bearing roundness detection device according to claim 2, characterized in that: The position sensor is a photosensitive sensor, which includes a light source generating component and a light source receiving component, and the light source generating component and the light source receiving component are respectively arranged on both sides of the conveyor belt.

4. A bearing roundness detection device according to claim 1, characterized in that: The support frame is provided with an illumination lamp, which is an annular light belt, and the diameter of the annular light belt is larger than the inner diameter of the bearing and smaller than the outer diameter of the bearing.

5. A bearing roundness detection device according to claim 2, characterized in that: The controller receives the sensing signal sent by the position sensor and calculates the bearing detection interval time period t; the controller controls the conveyor belt to stop running after the detection interval time period t.

6. A bearing roundness detection device according to claim 5, characterized in that: The detection interval time period calculation method includes: obtaining the conveyor belt conveying speed v and the maximum deceleration a, the detection interval time period Wherein L is the distance between the position sensor and the center point of the image acquisition component, and r is the radius of the bearing.

7. A bearing roundness detection device according to claim 6, characterized in that: The maximum deceleration a calculation method includes: calculating and obtaining Where F is the static friction when the bearing is placed, m is the mass of the bearing, and then determine whether a' is greater than the maximum acceleration a of the conveyor belt. 标 , if yes, then the maximum deceleration a=a 标 , if not, then the maximum deceleration a=a'.

8. A method for detecting roundness of a bearing, characterized in that: The bearing roundness detection method comprises the following steps: S1, receiving the sensing signal sent by the position sensor; S2, calculate and obtain the bearing detection interval time period t; S3, control the conveyor belt to stop running after the detection interval time period t; S4, the controller controls the image acquisition component to photograph the bearing to obtain a photographed image; S5, then construct a plane coordinate system, and embed the captured image into the plane coordinate system; S6. Processing the captured image to obtain multiple center points and their coordinates; S7, calculate the coordinates of the center of gravity of each center point (x Q ,y Q ); S8, calculating and obtaining the dispersion D of each center point relative to the center of gravity point; S9, then determine whether the discreteness D is greater than a preset standard discreteness D 标 , if yes, it is judged as unqualified, if no, it is judged as qualified; The method for obtaining the center point includes: separating the image of the bearing from the photographed image to obtain the image of the bearing, and then calculating the gray value of the image of the bearing to obtain the bright and dark point coordinates M j , where j is the number of the bright and dark points, and then calculate to obtain M j-1 With M j The distance L j-1 , and determine L j-1 Is it less than a preset standard distance L? 标 If yes, connect the lines and finally connect the ends to get the edge of the circle. If no, do not connect the lines. Then get three light and dark points at random on the same circle. Then get the three light and dark points to determine the circle and get the center of the circle as the center point. The center of gravity Where i is the number of the center point, I is the total number of center points, i = 1, 2, ┈, I, (x i ,y i ) are the coordinates of the center point numbered i; The dispersion of the center point relative to the center of gravity Where ɑ is the device parameter.

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