Online visual measurement device and method for geometric parameters of grooved rubber roller

Abstract

The invention relates to an online visual measurement device and method for geometric parameters of a grooved rubber covered roller, and the device comprises a slide carriage mechanism, a rotating mechanism, and a measurement mechanism. The slide carriage mechanism comprises a first linear motion mechanism, and the fixed end of the first linear motion mechanism is installed on a grinding carriage of the rubber roll grinding machine. The rotating mechanism comprises a second motor and a second rotating shaft, the second rotating shaft is driven by the second motor to rotate, and the second rotating shaft is rotatably arranged at the moving end of the first linear motion mechanism, so that the second rotating shaft is adjustable in height; the measuring mechanism comprises a measuring support, a camera and a light source, the measuring support is connected with the second rotating shaft and driven by the second rotating shaft to rotate, and the camera and the light source are connected to the measuring support and used for obtaining images of the outer circle of the rubber roller. According to the measuring device designed by the invention, online measurement of the geometric parameters of the thread tooth profile of the rubber roller is realized, and the requirements on tooth profile parameter measurement precision, efficiency and operation convenience are met.

Description

Technical Field

[0001] The invention relates to the technical field of geometric parameter measurement of a grooved rubber roller, in particular to an online visual measurement device and a measurement method for the geometric parameters of a grooved rubber roller. Background Art

[0002] Grooved rubber rollers are commonly used components in industrial production. The measurement object of a certain model of grooved rubber rollers of our company is the triangular thread on the outer circle of the extension plate, but there is currently a lack of corresponding online measurement tools. Summary of the invention

[0003] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides an online visual measurement device for geometric parameters of a grooved rubber roller, which is used in a rubber roller grinder and includes a slide mechanism, a rotating mechanism and a measuring mechanism.

[0004] The slide mechanism includes a first linear motion mechanism, and the fixed end of the first linear motion mechanism is mounted on the grinding wheel frame of the rubber roller grinder. The rotating mechanism includes a second motor and a second rotating shaft, and the second rotating shaft is driven to rotate by the second motor. The second rotating shaft is rotatably arranged on the moving end of the first linear motion mechanism, so that the second rotating shaft can be adjusted in height. The measuring mechanism includes a measuring bracket, a camera and a light source, and the measuring bracket is connected to the second rotating shaft and driven to rotate by the second rotating shaft. The camera and the light source are connected to the measuring bracket and are used to obtain an image of the outer circle of the rubber roller.

[0005] When measuring, the measuring bracket is moved by the first linear motion mechanism and the second rotating shaft so that the camera is aimed at the outer circle position of the rubber roller where the image needs to be collected; when not measuring, the measuring bracket is moved to the side of the grinder by the first linear motion mechanism and the second rotating shaft to reduce the space occupied and not affect the processing and loading and unloading of the rubber roller.

[0006] Furthermore, the camera also includes a telecentric lens. Since ordinary optical lenses have certain constraints, such as image deformation, errors caused by viewing angle selection, uncertainty of boundaries caused by inappropriate light source interference, etc., which in turn affect the measurement accuracy, the use of a telecentric lens can effectively reduce or even eliminate the above problems. The light source uses a parallel light source, which can eliminate the phenomenon of edge blur caused by light source diffusion, obtain images with clear and sharp edges, and improve measurement accuracy.

[0007] Furthermore, it also includes a left protective cover, a left linear motion mechanism, a right protective cover and a right linear motion mechanism. The left protective cover is arranged outside the light source, and can be moved along the measuring bracket by the left linear motion mechanism to protect the light source. The right protective cover is arranged outside the camera, and can be moved along the measuring bracket by the right linear motion mechanism to protect the camera. When not measuring, the left and right protective covers are closed to ensure that the camera and the light source are protected from dust and tiny abrasive particles in the air.

[0008] Furthermore, it also includes a slide rail, and the left protective cover and the right protective cover are slidably connected to the slide rail, so that the opening and closing process of the left and right protective covers is stable.

[0009] Furthermore, a limit block is provided on the moving end of the first linear motion mechanism, and a matching stop pin is provided at a corresponding position on the measuring bracket for limiting the rotation range of the measuring bracket so that the position of the measuring bracket is stable when acquiring the outer circle image of the rubber roller.

[0010] Furthermore, a counterweight block is provided on the measuring bracket to ensure that the weight of the measuring bracket on both sides relative to the second rotating shaft is equal.

[0011] The present invention also provides an online visual measurement method for geometric parameters of a grooved rubber roller, which is used in the above-mentioned measuring device and comprises the following steps: S1. Move the camera to align it with the outer circle of the rubber roller.

[0012] S2. The light source illuminates the target position, and the camera collects the thread image of the target position.

[0013] S3: Image preprocessing to eliminate noise in the image.

[0014] S4, contour extraction, segmenting the image by the grayscale threshold range of the image to obtain the contour of the thread area.

[0015] S5. Dimension measurement: divide the contour into several line segments according to the inflection points, select the line segments where the tooth peaks and tooth valleys are located, take out the tooth peaks and tooth valley position points, and calculate the thread parameters.

[0016] Furthermore, S1 also includes the movement of the rubber roller along the Y axis of the grinder. When the rubber roller moves to a specified position, the camera is controlled to capture the thread image; if the diameter of the position where the rubber roller captures the image changes, the height of the camera on the Z axis is adjusted by the slide mechanism.

[0017] Furthermore, S1 also includes the rubber roller rotating along the X-axis of the grinder. When the rubber roller rotates to a specified position, the camera is controlled to collect a thread image; and the measurement range is determined by adjusting the measurement step.

[0018] Furthermore, it also includes: S6. The thread profile is output as a graph, which contains the position information of the corresponding thread on the rubber roller.

[0019] The online visual measuring device designed in the present invention realizes the online measurement of the geometric parameters of the threaded tooth profile of the rubber roller, and meets the requirements for the measurement accuracy, efficiency and operation convenience of the tooth profile parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is an overall schematic diagram of the measuring device of the present invention; Figure 2 It is a schematic diagram of the right side of the measuring device of the present invention; Figure 3 It is a schematic diagram on the left side of the measuring device of the present invention; Figure 4 is a schematic diagram of an embodiment of the present invention in which the measuring mechanism is located at the lowest end; Figure 5 is a schematic diagram of an embodiment of the present invention in which the protective cover is opened; Figure 6 is a schematic diagram of the rise of the measuring mechanism in an embodiment of the present invention; Figure 7 is a schematic diagram of the rotation of the measuring mechanism in an embodiment of the present invention; Figure 8 is a schematic diagram of the working of the measuring mechanism in an embodiment of the present invention; Fig. 9 is a schematic diagram of a synchronous belt and a synchronous wheel in an embodiment of the present invention; Fig.10 is a schematic diagram of a rotating mechanism in an embodiment of the present invention; Fig.11 is a schematic structural diagram of a right protective cover in an embodiment of the present invention; Fig.12 is a schematic diagram of collecting images in an embodiment of the present invention; Fig.13 is a schematic diagram of contour extraction in an embodiment of the present invention; In the figure: 1. grinder; 2. slide mechanism; 3. rotating mechanism; 4. measuring mechanism; 5. mounting plate; 6. lead screw; 7. grinding wheel frame; 8. second motor; 9. second rotating shaft; 10. synchronous belt; 11. synchronous wheel; 12. measuring bracket; 13. camera; 14. light source; 15. stop pin; 16. limit block; 17. counterweight; 18. left protective cover; 19. left linear motion mechanism; 20. right protective cover; 21. right linear motion mechanism; 22. slide rail; 23. rubber roller; 24. grinding wheel. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1:

[0024] See also Figure 1-3 The embodiment is an online visual measurement device for geometric parameters of grooved rubber rollers, which is used in a rubber roller grinder 1 and includes a slide mechanism 2, a rotating mechanism 3 and a measuring mechanism 4. In the embodiment, the rubber roller 23 is made of special rubber, and the specification range of the rubber roller 23 is 290mm-300mm in diameter and less than 1600mm in length; the tooth groove width is 56 teeth in one inch; and the tooth profile angle is 110°.

[0025] The slide mechanism 2 includes a first linear motion mechanism, which in this embodiment uses a screw nut pair, wherein the nut is also provided with a mounting plate 5 to connect other components. The fixed end of the first linear motion mechanism is mounted on the grinding wheel frame 7 of the rubber roller grinder 1, that is, the screw 6 part, and the grinding wheel frame 7 is used for the grinding wheel 24 to process the rubber roller.

[0026] See also Figure 9-10 The rotating mechanism 3 includes a second motor 8 and a second rotating shaft 9. The second rotating shaft 9 is driven to rotate by the second motor 8. The second rotating shaft 9 is rotatably arranged on the moving end of the first linear motion mechanism, that is, on the mounting plate 5, so that the second rotating shaft 9 can be adjusted in height. In this embodiment, the lead screw 6 is preferably arranged vertically, so that the rotating mechanism 3 and the measuring mechanism 4 can move along the Z axis of the grinder 1, simplifying the control process. Similarly, the second motor 8 is also installed on the mounting plate 5. The second rotating shaft 9 in this embodiment uses a precision spindle, which is connected to the second motor 8 through a synchronous belt 10 and a synchronous wheel 11 to achieve precision transmission.

[0027] See also Fig.11 The measuring mechanism 4 includes a measuring bracket 12, a camera 13 and a light source 14. The camera 13 includes a telecentric lens. Since ordinary optical lenses have certain constraints, such as image deformation, errors caused by viewing angle selection, uncertainty of boundaries caused by inappropriate light source interference, etc., which affect the accuracy of measurement, the use of a telecentric lens can effectively reduce or even eliminate the above problems. The light source 14 uses a parallel light source, which can eliminate the phenomenon of edge blur caused by light source diffusion, and can obtain an image with clear and sharp edges, thereby improving the measurement accuracy. The measuring bracket 12 is connected to the second rotating shaft 9 and is driven to rotate by the second rotating shaft 9. The camera 13 and the light source 14 are connected to the measuring bracket 12 to obtain the image of the outer circle of the rubber roller.

[0028] A limit block 16 is provided on the mounting plate 5, and a matching stop pin 15 is provided at a corresponding position on the measuring bracket 12, which is used to limit the rotation range of the measuring bracket 12 so that the position of the measuring bracket 12 is stable when acquiring the outer circle image of the rubber roller. In this embodiment, it is preferably set that the measuring bracket 12 is in a horizontal position during measurement. A counterweight block 17 is also provided on the measuring bracket 12 so that the weight of the measuring bracket 12 on both sides relative to the second rotating shaft 9 is equal.

[0029] The present embodiment preferably further includes a left protective cover 18, a left linear motion mechanism 19, a right protective cover 20 and a right linear motion mechanism 21. The left linear motion mechanism 19 and the right linear motion mechanism 21 in the present embodiment are cylinders. The left protective cover 18 is arranged on the outside of the light source 14, and is driven by the left linear motion mechanism 19 to move along the measuring bracket 12, and is used to protect the light source 14. The right protective cover 20 is arranged on the outside of the camera 13, and is driven by the right linear motion mechanism 21 to move along the measuring bracket 12, and is used to protect the camera 13. When not measuring, the left and right protective covers are closed to ensure that the camera 13 and the light source 14 are protected from dust and tiny abrasive particles in the air. It further includes a slide rail 22, and the left protective cover 18 and the right protective cover 20 are slidably connected to the slide rail 22, so that the opening and closing process of the left and right protective covers is stable.

[0030] like Figure 1 As shown, the rubber roller is clamped horizontally under the support of the double dead center, and can achieve horizontal axial movement (Y-axis direction). The measuring device is fixedly installed on the left side of the grinding wheel frame 7 and can move radially (X-axis direction) with the grinding wheel frame 7. During measurement, the grinding wheel frame 7 moves close to the rubber roller, and the swing measuring bracket 12 is in a horizontal position, so that the line connecting the camera 13 and the telecentric light source is tangent to the outer circle of the middle diameter of the rubber roller thread.

[0031] See also Figure 4 In the initial stage before measurement, the mounting plate 5 is at the bottom, the measuring bracket 12 is in a vertical state, and the protective cover is closed to ensure that the camera 13 and the light source 14 are protected from dust and tiny abrasive particles in the air. At this time, the measuring bracket 12 is retracted to minimize the space occupied, while not affecting the loading and unloading of the rubber roller.

[0032] In the measurement preparation stage, the entire measurement device needs to be prepared to ensure smooth measurement. The specific actions can be divided into the following: a) Figure 5 As shown, the left and right protective covers are opened, the Z axis rises, and the rising height is higher than the highest point of the outer circle of the rubber roller, see Figure 6 ; b) If Figure 7As shown, the measuring bracket 12 is driven by the second motor 8. The second motor 8 first drives the small pulley, and further drives the large pulley through the synchronous belt 10. The large pulley transmits power to the precision spindle, driving the measuring bracket 12 to rotate. The measuring bracket 12 rotates to a horizontal position. At this time, the limit block 16 contacts the stop pin 15 to ensure that the measuring bracket 12 always maintains a stable and reliable horizontal position. The position of the limit block 16 can be obtained through the final assembly adjustment and measurement debugging; c) As shown in FIG. Figure 8 As shown, the measuring bracket 12 is close to the outer circle of the rubber roller. During the measurement phase, the rubber roller needs to be controlled to move back and forth along the Y axis. If the diameter of the rubber roller is different, the Z axis can be adjusted to reach an appropriate height.

[0033] After the measurement is completed, the action sequence of the measuring device is exactly the opposite to that of the measurement preparation stage. Specifically, the following actions can be taken: a) The measuring bracket 12 is moved away from the outer circle of the rubber roller to avoid collision of the lens caused by other actions. b) The measuring bracket 12 is rotated from the horizontal position to the vertical position; c) The left and right protective covers are closed, and the Z axis descends until the mounting plate 5 reaches the lowest point.

[0034] When the rubber roller processing is completed, it is necessary to use a certain control method to make the measuring mechanism 4 reach the appropriate photo position to ensure the visual measurement of rubber rollers of different specifications. First, after the CNC system completes the processing, it sends the start signal and the rubber roller specification signal to the PLC through the I / O. At this time, press the start button on the measuring mechanism 4 operating table, and the lifting motor rises to the corresponding position according to the rubber roller specification. After reaching the set height position, the protective cover of the camera 13 and the light source 14 is opened, and the current position of the cylinder is detected by the magnetic switch to determine whether the protective cover is opened normally. If the cylinder is opened normally, the second motor 8 starts to work and lowers the measuring bracket 12 to the set position. If there is an abnormality, the current action is paused and an alarm signal is sent. Manual mode is used to troubleshoot and reset. After confirming that there is no fault, it is restarted. The system opens the protective cover normally and can work normally.

[0035] Then, when the measuring mechanism 4 completes its preparatory action, the PLC sends a completion signal to the CNC system, and enters the camera 13 photo measurement phase. During the photo process, the CNC system and the visual system perform I / O interaction. After the rubber roller moves, the photo is started. After the photo is completed, the CNC machine tool controls the movement of the rubber roller until the entire photo measurement is completed.

[0036] Finally, after the visual measurement is completed, the CNC system sends a completion signal to the PLC. After receiving the signal, the PLC sequentially controls the second motor 8 to retract the rod, controls the cylinder to close the protective cover, and controls the first linear drive unit to complete the descending action, and the whole process ends.

[0037] In order to facilitate operation, the software developed on the industrial computer can not only complete the measurement function, but also directly control some axes of the machine tool. In addition, it is necessary to read some information of the machine tool (such as the model of the workpiece to be processed, the working status of the machine tool, etc.) through communication.

[0038] The measurement can be done automatically. When the rubber roller is processed, the measuring system receives the signal that the machine tool has completed the work, automatically moves to the top of the rubber roller, and then remains stationary. Then, the rubber roller is translated axially by controlling the axial direction of the rubber roller. When the axis moves to the specified position, it stops, and the photo measurement function is started. After the measurement is completed, the axis continues to move, and the photo measurement function is started again after stopping. The process is then repeated until the measurement of the entire rubber roller is completed. This method belongs to spot check measurement. The range of spot check measurement can be determined by adjusting the measurement step length. When the step length is 0, the full measurement of the rubber roller on a certain arc surface (because the rubber roller itself does not rotate) can be achieved. The shorter the step length, the longer the measurement time.

[0039] The measurement can be done manually. When the rubber roller is processed, the operator can manually control the movement of the measuring mechanism 4 and the machine tool and manually collect images through the software. When the operator clicks the direction button on the display screen to control the axial movement of the rubber roller, the measurement result can be obtained by clicking the measurement button when the camera 13 moves to the specified position. For ease of use, a tablet computer can be configured, and the operator can use it conveniently next to the machine tool without being in the measurement room, while observing the scene and comparing the images collected by the camera 13.

[0040] The data and measurement process are displayed as follows: the software automatically processes the collected graphics, regenerates the processed graphics into geometric graphics, marks the number of the measured tooth on the graphics, and displays the actual measured data of the tooth shape next to it: ① groove width ② groove depth ③ tooth angle ④ pitch; the width of the tolerance band of each parameter can be set, qualified products are green, those exceeding the tolerance range are red, and the excess value is displayed. The tooth shape measured at multiple points is displayed in the form of a curve graph, which is convenient for analyzing the error trend.

[0041] The specific steps for generating a test report are as follows: input the workpiece number, inspector, generate a file, and save it on the date; file management such as searching can be performed based on the number or inspector's name, date, etc.; the test report can be printed out.

[0042] The measuring mechanism 4 runs independent control software through an independent PLC controller. The hardware equipment can run automatically through interaction with external equipment (CNC machine tools, visual systems), and can also be used independently in manual mode. During the design and implementation, the focus is on the safety of equipment electricity use, and unexpected threats to the safety of equipment and operators during normal working processes and fault conditions are avoided through action and process interlocking. At the same time, during the working process, the possible safety risks of the current operation are prompted, and the alarm lights are used to guide personnel to ensure the safety of people and products. The control unit is mainly composed of the control unit hardware and software. The hardware part of the control part mainly includes the operating console, PLC controller, power supply part, motor, button, indicator light, functional equipment, sensor, etc.

[0043] The measuring device is mainly composed of hardware system and software system. The hardware system mainly includes the lighting system composed of light source, the imaging system composed of lens and industrial camera, the image acquisition card that transmits the image information signal to the computer system, and the mechanical motion platform responsible for the operation of the whole system. The hardware part is responsible for the image acquisition of the whole visual measurement system. The software system completes the processing of image details and image measurement by preprocessing the collected images, edge extraction and other methods.

[0044] In order to meet the requirements of high-precision measurement, a 24.4-megapixel large-surface, high-resolution industrial digital camera (a2A5328-4gmPRO) from the German BASLER ACE series is used. The pixel unit size of the camera's CMOS sensor is 2.74μm×2.74μm. With a telecentric lens, parallel light source, and subsequent optimization of sub-pixel algorithms, it can theoretically meet the measurement accuracy requirements of 5 to 10μm.

[0045] In precision optical measurement systems, ordinary optical lenses have certain constraints, such as image deformation, errors caused by viewing angle selection, uncertainty of boundaries caused by inappropriate light source interference, etc., which in turn affect the measurement accuracy. Telecentric lenses can effectively reduce or even eliminate the above problems. Therefore, telecentric lenses are the decisive components of precision optical measurement systems. In order to meet the measurement requirements, this system uses Canrui Optics' 1.1-inch high-magnification ultra-high-resolution telecentric lens (XF-10MDT1.5X110D-1C), which has a small size and large aperture and is suitable for high-precision visual inspection in small spaces.

[0046] If a telecentric lens is used with an ordinary backlight, severe reflection will occur, making the grayscale values ​​at the corner and its adjacent parts opposite, so that the detection effect cannot achieve the expected goal. Parallel light source can eliminate edge blur caused by light source diffusion. It can obtain images with clear and sharp edges, greatly improving measurement accuracy. After using parallel light source, the edges are neat and there is no reflection, so it is easy to determine the edges and angles. This system uses BT-TCL series parallel light source.

[0047] The system is a real-time online measurement system. Due to the large amount of calculation and transmission of ultra-high resolution images, it uses Intel's 10th generation Corei7 desktop CPU and Geforce series GTX1050TI graphics card and above and a high-speed image acquisition card.

[0048] In this embodiment, when the measurement environment and the rubber roller to be measured meet the measurement requirements, the measurement accuracy is: tooth groove depth 5-10 microns, angle tolerance ±1°, tooth groove width and pitch error 0.01 mm, which can meet production requirements.

[0049] Embodiment 2:

[0050] This embodiment is an online visual measurement method for geometric parameters of a grooved rubber roller, which is used in the measurement device in the above embodiment and includes the following steps: S1, move the camera 13 to align the camera 13 with the outer circle target position of the rubber roller.

[0051] S2, the light source 14 illuminates the target position, and the camera 13 collects the thread image of the target position, see Fig.12 The camera 13 takes pictures and the rubber roller moves in a predetermined rhythm. When the rubber roller moves to the specified position, the CNC system triggers the camera 13 to take pictures through the I / O signal. Taking the maximum pitch (2.45mm) and the maximum tooth width (0.7mm) in the project requirements as an example for verification, the camera field of view is 9.5mm*6.9mm, and the number of effective teeth that can be obtained within the field of view is about 3 to 4.

[0052] S3. Image preprocessing to eliminate noise in the image. Due to acquisition, lighting and other reasons, the characteristics in the edge image (such as pixel grayscale, texture, etc.) are distributed discontinuously, and the image surrounding characteristics have step changes or ridge changes. In addition, the rubber roller is made of rubber. During the grinding process, there will be particles and burrs attached to the thread surface, affecting the actual measurement accuracy. In view of the above problems, it is necessary to preprocess the image, which can eliminate the influence of the external environment on the measurement effect to a certain extent.

[0053] S4, contour extraction, according to the different grayscales of the thread and the background in the image, there will be obvious edges at the boundary. Using this feature, the image can be segmented by the threshold range to obtain the thread area, and the image can be segmented by the grayscale threshold range to obtain the thread area contour. Fig.13 .

[0054] S5. Dimension measurement. To obtain the groove width, groove depth, tooth profile angle and pitch data, it is necessary to extract the position coordinates of the tooth peaks and tooth valleys in the above contour image. The tooth peaks and tooth valleys are extracted according to the characteristic points of the tooth groove edge. The contour segmentation algorithm is used to segment the contour into several line segments according to the inflection points, and the line segments where the tooth peaks and tooth valleys are located are screened out. The tooth peaks and tooth valleys are taken out and the thread parameters are calculated. Finally, calibration is performed to convert the image size into the actual size.

[0055] Preferably, it also includes S6, outputting the thread profile as a graph, which includes the position information of the corresponding thread on the rubber roller. Due to the segmented measurement, the threads photographed and measured each time are numbered, and the actual position of the thread corresponding to the rubber roller can be found according to the number.

[0056] Preferably, S1 also includes the rubber roller moving along the Y axis of the grinder 1, and when the rubber roller moves to a specified position, the camera 13 is controlled to collect the thread image; if the diameter of the position where the rubber roller collects the image changes, the height of the camera 13 on the Z axis is adjusted by the slide mechanism 2. It also includes the rubber roller rotating along the X axis of the grinder 1, and when the rubber roller rotates to a specified position, the camera 13 is controlled to collect the thread image; and the measurement range is determined by adjusting the measurement step length.

[0057] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An online visual measurement device for geometric parameters of grooved rubber rollers, used in rubber roller grinders, characterized in that: It includes a slide mechanism, a rotating mechanism and a measuring mechanism; the slide mechanism includes a first linear motion mechanism, the fixed end of which is mounted on the grinding wheel frame of the rubber roller grinder; the rotating mechanism includes a second motor and a second rotating shaft, the second rotating shaft is driven to rotate by the second motor, and the second rotating shaft is rotatably arranged on the movable end of the first linear motion mechanism so that the second rotating shaft can be adjusted in height; the measuring mechanism includes a measuring bracket, a camera and a light source, the measuring bracket is connected to the second rotating shaft and is driven to rotate by the second rotating shaft, and the camera and the light source are connected to the measuring bracket and are used to obtain the image of the outer circle of the rubber roller.

2. The on-line visual measurement device for geometric parameters of grooved rubber rollers according to claim 1 is characterized in that: The camera also includes a telecentric lens, and the light source is a parallel light source.

3. The on-line visual measurement device for geometric parameters of grooved rubber rollers according to claim 1 is characterized in that: It also includes a left protective cover, a left linear motion mechanism, a right protective cover and a right linear motion mechanism; the left protective cover is arranged outside the light source, and is driven by the left linear motion mechanism to move along the measuring bracket, and is used to protect the light source; The right protective cover is arranged on the outside of the camera and is driven by the right linear motion mechanism to move along the measuring bracket to protect the camera.

4. The on-line visual measurement device for geometric parameters of grooved rubber rollers according to claim 3 is characterized in that: It also comprises a slide rail, a left protective cover and a right protective cover which are slidably connected to the slide rail.

5. The on-line visual measurement device for geometric parameters of grooved rubber rollers according to claim 1 is characterized in that: A limit block is provided on the moving end of the first linear motion mechanism, and a matching stop pin is provided at a corresponding position on the measuring bracket to limit the rotation range of the measuring bracket so that the position of the measuring bracket is stable when acquiring the outer circle image of the rubber roller.

6. The on-line visual measurement device for geometric parameters of grooved rubber rollers according to claim 1 is characterized in that: A counterweight block is also provided on the measuring bracket to ensure that the weight of the measuring bracket on both sides relative to the second rotating shaft is equal.

7. An online visual measurement method for geometric parameters of a grooved rubber roller, used in the measuring device as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1, move the camera to align the camera with the outer circle target position of the rubber roller; S2, the light source illuminates the target position, and the camera collects the thread image of the target position; S3, image preprocessing, eliminating noise in the image; S4, contour extraction, segmenting the image by the grayscale threshold range of the image to obtain the contour of the thread area; S5. Dimension measurement: divide the contour into several line segments according to the inflection points, select the line segments where the tooth peaks and tooth valleys are located, take out the tooth peaks and tooth valley position points, and calculate the thread parameters.

8. The method for online visual measurement of geometric parameters of grooved rubber roller according to claim 7, characterized in that: S1 also includes the movement of the rubber roller along the Y axis of the grinder. When the rubber roller moves to the specified position, the camera is controlled to collect the thread image; if the diameter of the position where the rubber roller collects the image changes, the height of the camera on the Z axis of the grinder is adjusted by the slide mechanism.

9. The method for online visual measurement of geometric parameters of grooved rubber rollers according to claim 7, characterized in that: S1 also includes the rubber roller rotating along the X-axis of the grinder. When the rubber roller rotates to a specified position, the camera is controlled to collect a thread image. The measurement range is determined by adjusting the measurement step length.

10. The method for online visual measurement of geometric parameters of grooved rubber roller according to claim 7, characterized in that: Also includes: S6. The thread profile is output as a graph, which contains the position information of the corresponding thread on the rubber roller.

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