Invar bar code leveling staff calibrating device

Abstract

The utility model provides an invar bar code leveling staff calibrating device. The calibrating device comprises a measuring workbench, a laser linear measuring assembly, a CCD (Charge Coupled Device) camera and an industrial personal computer, the top surface of a main seat body of the measuring workbench is provided with a long-width movable sliding table capable of transversely sliding, and the top surface of the movable sliding table is provided with a datum line and scale marks; two movable magnetic type clamping supports are arranged on the top face of the movable sliding table along the datum line frame, and the distance between the transverse center tangent planes of the two clamping supports is equal to the distance between two supporting points when the measured leveling staff is supported by a Bezier point. According to the calibrating device, during measurement, the CCD camera is fixed, the leveling staff synchronously moves along with the movable sliding table, smaller metering deviation can be obtained, the magnetic type clamping support with specific design is adopted, various invar bar code leveling staff with different length regulations can be calibrated, higher calibrating efficiency and precision can be provided, and the calibrating device can be used for calibrating the invar bar code leveling staff with different length regulations. And the accuracy and the reliability of the calibration data of the leveling staff are better ensured.

Description

Technical Field

[0001] This utility model relates to a measuring instrument calibration device, specifically an Invar barcode leveling ruler calibration device, belonging to the field of measuring instrument calibration technology. Background Technology

[0002] The Inwa barcode leveling rod is a tool used in conjunction with a digital level for leveling measurements. It consists of an Inwa strip and an aluminum alloy body. The strip features alternating black and yellow barcodes of varying widths. The lower end is fixed to a steel sleeve on the base plate, while the upper end is tensioned by a spring. Due to daily wear and tear and environmental factors, the precision and accuracy of the Inwa barcode leveling rod will inevitably experience some errors. Therefore, periodic calibration is necessary to ensure the reliability of its leveling results.

[0003] For the metrological verification of Inwa barcode leveling rods, various types of verification devices exist in China. The main difference lies in the placement method of the Inwa barcode leveling rod being measured; there are vertical and horizontal length comparison measurement methods, with the horizontal length comparison measurement method being more widely used. Chinese patent CN117451078A discloses an automated accuracy verification device for barcode leveling rods, and Chinese patent CN118258328A discloses an instrument that combines line pattern measurement and straightness measurement functions; both of these patents employ the horizontal length comparison measurement method. In these two patented verification devices, when performing line pattern verification on the barcode leveling rod, the leveling rod remains stationary. A CCD camera on a moving slide captures the barcode image of the leveling rod being measured, while a laser interferometer measures the displacement data of the moving slide. The computer then processes and calculates the acquired images and displacement data to obtain the corresponding verification results.

[0004] Both of the aforementioned patented calibration devices are designed based on the basic framework of "the leveling rod remaining stationary during measurement while the CCD camera moves synchronously with the moving slide." However, the CCD camera will generate a certain degree of offset vibration during synchronous movement with the moving slide. The minute vibration of the CCD camera will be amplified in the image, causing a larger deviation. Moreover, the movement of the short-amplitude moving slide supporting the CCD camera on the slide rail is not smooth enough, making the vibration deviation direction of the CCD camera during movement random and uncontrollable. It may not coincide with the direction of the laser interferometer's measurement axis. The image deviation caused by vibration and the displacement data deviation measured by the laser interferometer cannot cancel each other out, which has a significant impact on the measurement results. Utility Model Content

[0005] To address this issue, the applicant has designed a calibration device for a barcode-based leveling rod with smaller measurement deviations, based on the fundamental framework of "the CCD camera remaining stationary while the leveling rod moves synchronously with the sliding table during measurement." This is because the offset vibration generated when the leveling rod moves synchronously with the sliding table does not amplify the deviation in the CCD camera image. Furthermore, the long sliding table supporting the leveling rod moves more smoothly on the slide rail, ensuring that the vibration deviation direction of the leveling rod during movement remains in the same direction as the measurement axis of the laser interferometer. The image deviation caused by vibration and the displacement data deviation measured by the laser interferometer can cancel each other out, resulting in minimal impact on the measurement results.

[0006] Furthermore, since the leveling rod being measured is placed on a moving slide via a support frame and moves synchronously with the slide, leveling rods typically come in various lengths ranging from 1m to 3m. For slender leveling rods, the magnitude and state of bending deformation caused by their own weight are closely related to the method of support and the position of the fulcrum. The change in length of the leveling rod along its central axis is minimal when the two support points are located at the Bezier points of the leveling rod. Therefore, if the leveling rod cannot be supported and effectively clamped at the Bezier points, deflection measurement errors will be introduced due to the elastic deformation of the leveling rod, or axial measurement errors will be introduced due to the asynchronous movement of the leveling rod and the moving slide. Current calibration devices typically use two or three fixed-spaced supports to provide open support for the leveling rod. When the leveling rod is of different lengths, the fixed supports cannot adapt to changes in the Bezier points of the leveling rod, failing to provide effective support and clamping at the Bezier points, which easily leads to errors in deflection and axial measurement. To address this problem, the applicant has specifically designed a movable magnetic clamping bracket to provide Bezier point support and clamping for leveling rods of different lengths.

[0007] The specific technical solution adopted in this utility model is as follows:

[0008] A calibration device for an Invar barcode leveling rod includes a measuring worktable, a laser linear measuring component, a CCD camera, and an industrial control computer.

[0009] The measuring worktable has a main body, on the top surface of which are fixedly mounted two parallel transverse guide rails. A long sliding table that can slide laterally along the guide rails is strung across the two guide rails. Below the sliding table, the main body has a horizontally rotatable lead screw, one end of which is connected to a servo motor. The sliding table is threadedly connected to the lead screw via a nut fixedly mounted on its bottom surface. The servo motor drives the lead screw to rotate, thereby controlling the lateral sliding of the sliding table on the guide rails of the main body. The sliding table is made of ferromagnetic material. A horizontal reference line with the same sliding direction is provided on the top surface of the sliding table. A set of scale lines indicating the lateral spacing is provided in front of the reference line. Two movable magnetic clamping brackets are mounted on the top surface of the sliding table along the reference line. The lateral spacing between the transverse center tangents of the two clamping brackets on the scale lines of the sliding table is equal to the spacing between the two support points when the leveling rod being measured is supported by Bezier points.

[0010] The laser linear measurement assembly includes a laser interferometer, an interferometer, and a reflector. The laser interferometer is mounted on one side of the transverse end of the main body of the measurement worktable via a floor support. The interferometer is fixedly mounted on the transverse end of the main body of the measurement worktable on the same side as the laser interferometer. The reflector is mounted on the movable slide of the measurement worktable and moves synchronously with the movable slide. The laser interferometer, the interferometer, and the reflector are in a collinear state, and the collinear direction is parallel to the moving direction of the movable slide.

[0011] The CCD camera is mounted on the front of the middle of the measuring worktable via a floor support, with the camera's microscope lens facing backward toward the leveling rod being measured, which is clamped and supported on two clamping brackets.

[0012] The industrial control computer is equipped with a circuit that connects to the drive system of the servo motor of the measuring workbench and controls the servo motor. The industrial control computer is also equipped with a circuit that connects to the laser interferometer and CCD camera and enables data exchange.

[0013] The clamping bracket, from bottom to top, comprises a magnetic pad, a dovetail base, a dovetail slide plate, a lifting handwheel, a lifting shaft, and a clamping seat. The magnetic pad is a flat pad with multiple strongly magnetic neodymium magnets fixedly embedded in its bottom surface. A vertical reference center line is located at the horizontal center of the front face of the magnetic pad. The dovetail base is fixedly connected to the magnetic pad with screws. The top surface of the dovetail base has a horizontal longitudinal dovetail groove, and the bottom center of the groove has a longitudinal through hole. A front sealing plate and a rear sealing plate are respectively mounted at the front and rear ends of the groove. The bottom surface of the dovetail slide plate has a horizontal longitudinal dovetail tenon. The dovetail slide plate is slidably inserted into the dovetail groove of the dovetail base via the dovetail tenon, allowing the dovetail slide plate to be slidably supported above the dovetail base. The dovetail slide has a vertical through hole in the middle that is vertically aligned with the elongated through hole of the dovetail seat. The rear end face of the dovetail slide is connected to a lifting locking screw extending from the outside into the vertical through hole via a screw hole. The front end face of the dovetail slide has a fixedly embedded nut. The front end plate of the dovetail seat has a longitudinal sliding screw with a handwheel that can rotate in place. The shaft of the longitudinal sliding screw is threaded to the nut of the dovetail slide. One side of the dovetail seat has a dovetail locking screw extending from the outside into the side wall of the dovetail groove via a screw hole. Rotating the longitudinal sliding screw adjusts the forward and backward sliding position of the dovetail slide, and tightening the dovetail locking screw locks the forward and backward sliding position of the dovetail slide. The lifting handwheel has a vertical screw hole in the middle and is freely supported. The annular handwheel, located in the center of the top surface of the dovetail slide, has a vertical screw hole with a diameter larger than that of the vertical through hole in the dovetail slide. The lifting shaft is a vertically stepped shaft, wider at the top and narrower at the bottom. The middle section of the lifting shaft is threaded, the upper section is a support plate with an outer diameter larger than that of the threaded section, and the lower section is a smooth shaft with an outer diameter smaller than that of the threaded section. The outer wall of the smooth shaft section has a vertical slot. The lifting shaft is inserted into the lifting handwheel from top to bottom. The threaded section of the lifting shaft is threaded into the vertical screw hole of the lifting handwheel. The smooth shaft section of the lifting shaft passes through the vertical through hole of the dovetail slide and extends into the long through hole of the dovetail seat. The tip of the lifting locking screw on the dovetail slide extends into the vertical slot of the smooth shaft section of the lifting shaft to limit the rotation of the lifting shaft. Rotating the lifting handwheel adjusts the lifting position of the lifting shaft, and tightening the lifting locking screw locks the lifting position. The clamping seat is a C-shaped clamping seat with its opening facing forward. The support plate of the lifting shaft is fixedly connected to the lower plate of the clamping seat with screws, so that the clamping seat is centrally supported above the lifting shaft. The upper plate of the clamping seat is connected to a clamping screw that extends downward into the clamping seat through a screw hole. The upper end of the clamping screw is fixedly connected to the handwheel, and the lower end of the clamping screw is hinged to a pressure block that can rotate around the lower end of the clamping screw. The top surface of the lower plate of the clamping seat has a longitudinal reference center line at a horizontally centered position. The longitudinal reference center line and the vertical reference center line of the magnetic pad are on the same vertical plane.

[0014] This utility model's Invar barcode leveling rod calibration device features a stationary CCD camera while the leveling rod moves synchronously with the sliding table during measurement, resulting in smaller measurement deviations. Furthermore, the sliding table is equipped with two movable magnetic clamping brackets. For leveling rods of different lengths, the clamping brackets can be flexibly adjusted to the two Bezier points of the leveling rod before support and clamping it, thus avoiding deflection measurement errors caused by the elastic deformation of the leveling rod, or axial measurement errors caused by the asynchronous movement of the leveling rod and the sliding table. By adjusting the corresponding components of the clamping brackets, the support height and position of the leveling rod can be quickly adjusted, ensuring that the measurement fully meets the Abbe error principle. Therefore, this calibration device can calibrate Invar barcode leveling rods of various specified lengths, providing higher calibration efficiency and accuracy, and better ensuring the accuracy and reliability of leveling rod calibration data. In addition, since the two clamping brackets are magnetically attached, they can be easily detached from the sliding table when necessary, allowing the sliding table to be used for other testing projects. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the Benoit barcode leveling ruler calibration device.

[0016] Figure 2 for Figure 1 A magnified view of part A in the image.

[0017] Figure 3 This is a schematic diagram of the three-dimensional structure of the clamping bracket.

[0018] Figure 4 for Figure 3 A three-dimensional structural diagram of the clamping bracket when rotated to a view where the back faces forward.

[0019] Figure 5 for Figure 3 Front view sectional view of the clamping bracket.

[0020] Figure 6 for Figure 3 Left sectional view of the clamping bracket.

[0021] Figure 7 for Figure 3 A three-dimensional structural diagram of the clamping bracket when rotated to the point where the bottom surface faces upward.

[0022] Figure 8 for Figure 3 Exploded view of the parts.

[0023] Figure 9 for Figure 4 Exploded view of the parts.

[0024] Figure 10This is a schematic diagram of the three-dimensional structure of a CCD camera.

[0025] Figure 11 A three-dimensional structural diagram of the reflector.

[0026] Figure 12 This is a schematic diagram of the three-dimensional structure of the interference mirror.

[0027] In the diagram: 1-Main seat, 1.1-Iron bracket, 2-Guide rail, 3-Moving slide, 3.1-Baseline, 3.2-Scale line, 3.3-Linear bearing slider, 4-Lead screw, 5-Servo motor, 6-Clamping bracket, 7-Laser interferometer, 8-Interferometer, 9-Reflector, 10-CCD camera, 10.1-Microscope lens, 10.2-Cold light source supplementary light, 11-Industrial control computer, 12-Magnetic pad, 12.1-Strong magnetic neodymium sheet, 12.2-Vertical baseline, 13-Swallow Tailstock, 13.1-Dovetail groove, 13.2-Long through hole, 14-Dovetail slide plate, 14.1-Dovetail tenon, 14.2-Vertical through hole, 14.3-Threaded nut, 15-Lifting handwheel, 15.1-Vertical screw hole, 16-Lifting shaft, 16.1-Vertical slot, 17-Clamping seat, 17.1-Longitudinal reference center line, 18-Front sealing plate, 19-Rear sealing plate, 20-Lifting locking screw, 21-Longitudinal sliding screw, 22-Dovetail locking screw, 23-Pressure screw, 24-Pressure block, 25-Extending screw, 26-Magnetic base. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments and accompanying drawings. In the description of the present invention, the directional terms "front," "rear," "left," "right," "up," and "down" are based on the accompanying drawings. Figure 1 The orientation or positional relationship shown is defined only for the convenience of describing this utility model, and does not refer to a specific orientation that the device or component must have, and should not be regarded as a limitation of this utility model.

[0029] like Figures 1-12 As shown, the Beninwa barcode leveling rod calibration device includes a measuring workbench, a laser linear measuring component, a CCD camera, and an industrial control computer.

[0030] The measuring workbench has a main body 1. Two parallel transverse guide rails 2 are fixedly installed on the top surface of the main body 1. A long sliding slide 3 that can slide laterally along the guide rails 2 is strung across the two guide rails 2. Below the sliding slide 3, the main body 1 has a horizontally lateral lead screw 4 that can rotate in place. One end of the lead screw 4 is connected to a servo motor 5. The sliding slide 3 is threadedly connected to the lead screw 4 through a nut fixedly installed on its bottom surface. The servo motor 5 drives the lead screw 4 to rotate, thereby controlling the sliding slide 3 along the guide rails of the main body 1. 2. Lateral sliding; The movable slide 3 is made of ferromagnetic material. The top surface of the movable slide 3 is provided with a horizontal lateral reference line 3.1 in the same direction as its sliding. A set of scale lines 3.2 marking the lateral spacing is provided on the front side of the reference line 3.1. Two movable magnetic clamping brackets 6 are mounted on the top surface of the movable slide 3 along the reference line 3.1. The lateral spacing between the lateral center tangents of the two clamping brackets 6 on the scale line 3.2 of the movable slide 3 is equal to the spacing between the two support points when the leveling rod being measured is supported by Bezier points.

[0031] The laser linear measurement assembly includes a laser interferometer 7, an interferometer 8, and a reflector 9. The laser interferometer 7 is mounted on the side of one of the transverse ends of the main body 1 of the measurement workbench via a floor support. The interferometer 8 is fixedly mounted on the transverse end of the main body 1 of the measurement workbench on the same side as the laser interferometer 7. The reflector 9 is mounted on the sliding slide 3 of the measurement workbench and moves synchronously with the sliding slide 3. The laser interferometer 7, the interferometer 8, and the reflector 9 are in a collinear state, and the collinear direction is parallel to the moving direction of the sliding slide 3.

[0032] The CCD camera 10 is mounted on the front of the middle of the measuring worktable via a floor support, with the microscope lens 10.1 of the CCD camera 10 facing backward toward the leveling rod being measured, which is clamped and supported on two clamping brackets 6.

[0033] The industrial control computer 11 is equipped with a circuit that connects to the drive system of the servo motor 5 of the measuring workbench and controls the servo motor 5. The industrial control computer 11 is also equipped with a circuit that connects to the laser interferometer 7 and the CCD camera 10 and realizes data exchange.

[0034] The clamping bracket, from bottom to top, includes a magnetic pad 12, a dovetail seat 13, a dovetail slide 14, a lifting handwheel 15, a lifting shaft 16, and a clamping seat 17. The magnetic pad 12 is a flat pad with multiple strongly magnetic neodymium magnets 12.1 fixedly embedded on its bottom surface. A vertical reference center line 12.2 is provided at the horizontal center position on the front face of the magnetic pad 12. The dovetail seat 13 is fixedly connected to the magnetic pad 12 with screws. The top surface of the dovetail seat 13 has a horizontal longitudinal dovetail groove 13.1. A longitudinal through hole 13.2 is provided in the middle of the bottom of the dovetail groove 13.1. A front sealing plate 18 and a rear sealing plate 19 are respectively mounted at the front and rear ends of the dovetail groove 13.1. 9; The bottom surface of the dovetail slide plate 14 is provided with a horizontal longitudinal dovetail tenon 14.1. The dovetail slide plate 14 is slidably inserted into the dovetail groove 13.1 of the dovetail seat 13 through the dovetail tenon 14.1, so that the dovetail slide plate 14 is slidably supported above the dovetail seat 13. The middle part of the dovetail slide plate 14 is provided with a vertical through hole 14.2 that is vertically opposite to the elongated through hole 13.2 of the dovetail seat 13. The rear end face of the dovetail slide plate 14 is connected to a lifting locking screw 20 that extends from the outside into the vertical through hole through a screw hole. The front end face of the dovetail slide plate 14 is provided with a fixedly embedded nut 14.3. The front sealing plate 18 of the dovetail seat 13 is equipped with a longitudinal sliding screw with a handwheel that can rotate in place. 21. The rod of the longitudinal sliding screw 21 is threadedly connected to the nut 14.3 of the dovetail slide plate 14. One side of the dovetail seat 13 is connected to a dovetail locking screw 22 that extends from the outside into the inner side wall of the dovetail groove 13.1 through a screw hole. Rotating the longitudinal sliding screw 21 can adjust the forward and backward sliding position of the dovetail slide plate 14, and tightening the dovetail locking screw 22 can lock the forward and backward sliding position of the dovetail slide plate 14. The lifting handwheel 15 is an annular handwheel with a vertical screw hole 15.1 in the middle and is freely supported in the middle of the top surface of the dovetail slide plate 14. The diameter of the vertical screw hole 15.1 is larger than the diameter of the vertical through hole 14.2 of the dovetail slide plate 14. The lifting shaft 16 is the upper The vertical stepped shaft 16 has a larger outer diameter and a smaller outer diameter. The middle section of the lifting shaft 16 is a threaded section, the upper section of the lifting shaft 16 is a support plate with an outer diameter larger than that of the threaded section, and the lower section of the lifting shaft 16 is a smooth shaft with an outer diameter smaller than that of the threaded section. The outer wall of the smooth shaft section has a vertical slot 16.1. The lifting shaft 16 is inserted into the lifting handwheel 15 from top to bottom. The threaded section of the lifting shaft 16 is threadedly connected to the vertical screw hole 15.1 of the lifting handwheel 15. The smooth shaft section of the lifting shaft 16 passes through the vertical through hole 14.2 of the dovetail slide plate 14 and extends into the long through hole 13.2 of the dovetail seat 13. The front end of the lifting locking screw 20 on the dovetail slide plate 14 extends into the vertical slot 16 of the smooth shaft section of the lifting shaft 16.The rotation of the lifting shaft 16 is limited within the clamping bracket 6. Rotating the lifting handwheel 15 adjusts the lifting position of the lifting shaft 16, and tightening the lifting locking screw 20 locks the lifting position of the lifting shaft 16. The clamping seat 17 is a forward-facing C-shaped clamping seat. The support plate of the lifting shaft 16 is fixedly connected to the lower plate of the clamping seat 17 with screws, so that the clamping seat 17 is centrally supported above the lifting shaft 16. A clamping screw 23 extending downwards into the clamping seat 17 is connected to the middle of the upper plate of the clamping seat 17 through a screw hole. The upper end of the clamping screw 23 is fixedly connected to a handwheel, and the lower end of the clamping screw 23 is hinged to a pressure block 24 that can rotate around the lower end of the clamping screw 23. A longitudinal reference centerline 17.1 is provided at the horizontal center position on the top surface of the lower plate of the clamping seat 17. The longitudinal reference centerline 17.1 and the vertical reference centerline 12.2 of the magnetic pad 12 are both located on the horizontal center tangent plane of the clamping bracket 6.

[0035] To facilitate the adjustment of the position and height of the interferometer 8 and the reflector 9, both the interferometer 8 and the reflector 9 are equipped with a magnetic base 26 with a vertically extending screw 25. The mirror bodies of the interferometer 8 and the reflector 9 are connected to the rod body of the extending screw 25, and their heights can be adjusted and locked. The interferometer 8 is attracted and fixed to the iron bracket 1.1 at the transverse end of the main body 1 of the measuring workbench through its magnetic base 26, and the reflector 9 is attracted and fixed to the top surface of the movable slide 3 of the measuring workbench through its magnetic base 26.

[0036] Furthermore, the movable slide 3 is slidably supported on the front and rear guide rails 2 of the main body 1 by linear bearing sliders 3.3 at both ends of its bottom.

[0037] Furthermore, the lifting handwheel 15, the handwheel of the longitudinal sliding screw 21, the handwheel of the clamping screw 23, the round screw head of the lifting locking screw 20, and the round screw head of the dovetail locking screw 22 are all provided with straight knurling on their outer circumference for easy gripping.

[0038] Furthermore, cold light source supplementary lights 10.2 are respectively provided on the upper and lower sides in front of the microscope head 10.1 of the CCD camera 10.

[0039] When calibrating the Invar barcode leveling rod using this calibration device, the following steps are included:

[0040] (1) Calculate the distance between the two Bezier points when the leveling rod is supported by Bezier points according to the formula S=0.55938L, where S is the distance between the two support points when the Bezier point is supported and L is the length of the leveling rod. According to the calculation results, place and adjust the position of the two clamping brackets 6 on the moving slide 3. First, make the front end face of the magnetic pad 12 of the two clamping brackets 6 fit on the reference line 3.1 of the moving slide 3. Then, make the horizontal distance between the vertical reference center line 12.2 of the magnetic pad 12 of the two clamping brackets 6 and the scale line 3.2 of the moving slide 3 equal to S.

[0041] If the length of the leveling rod being measured is 2m, then when using Bezier point support, the distance between the two support points is S=0.55938*2≈1.118m; when placing and adjusting the clamping bracket 6, the vertical reference center line 12.2 of one clamping bracket 6 can be aligned with the scale line 0 or an integer position of the moving slide 3 first, and then the position of the other clamping bracket 6 can be moved so that its vertical reference center line 12.2 is aligned with the scale line position of the corresponding spacing.

[0042] (2) Calculate the distance from the end face of the leveling rod to the Bezier point on the same side according to the formula L1=(LS) / 2, where L1 is the distance from the end face of the leveling rod to the Bezier point on the same side, L is the length of the leveling rod, and S is the distance between the two support points when using Bezier point support; place the leveling rod into the clamping seat 17 of the two clamping brackets 6 with the rod face forward and the back attached to the vertical plate of the clamping seat 17; adjust the lateral position of the leveling rod until the distance from the end face of the leveling rod to the longitudinal reference center line 12.2 of the clamping bracket 6 on the same side is equal to L1; tighten the clamping screws 23 of the two clamping brackets 6 to lock the lateral position of the leveling rod.

[0043] If the length of the leveling rod being measured is 2m, then the distance L1 from the end face of the leveling rod to the Bessel point on the same side is (2-1.118) / 2=0.441m. When adjusting the lateral position of the leveling rod, after measuring the distance from the end face of the leveling rod to the longitudinal reference centerline 12.2 of the clamping bracket 6 on the same side, which is equal to 0.441m, tighten the clamping screws 23 of the two clamping brackets 6 to lock the lateral position of the leveling rod.

[0044] (3) Set up the laser interferometer 7 and the interferometer 8, and fix the reflector 9 on the movable slide 3 and place it next to the end of the leveling rod to be measured. Adjust the laser interferometer 7, the interferometer 8 and the reflector 9 to be collinear in front of the leveling rod to be measured, and make the height of the optical axis of the laser interferometer 7 consistent with the height of the microscope head 1.1 of the CCD camera 10.

[0045] (4) Repeatedly fine-tune the lifting handwheels 15 of the two clamping brackets 6 to adjust the barcode area of ​​the leveling rod to be measured to be at the same height as the optical axis of the laser interferometer 7. Use a height gauge to measure the height of the clamping seat 17 of the two clamping brackets 6 from the top surface of the moving slide 3 to ensure that the clamping seat 17 of the two clamping brackets 6 is at an absolutely equal height. Then tighten the lifting locking screws 20 of the two clamping brackets 6 to lock the support height of the leveling rod to be measured, so that the lateral height of the entire barcode area of ​​the leveling rod to be measured is completely parallel to the optical axis of the laser interferometer 7.

[0046] (5) Adjust the longitudinal sliding screws 21 of the two clamping brackets 6 in sequence. First, move the scale surface of the leveling rod to be measured forward and block the optical path of the laser interferometer 7, so that the brightness of the backlight signal indicator on the laser interferometer 7 becomes weak. Then, move the scale surface of the leveling rod to be measured slightly backward. When the brightness of the backlight signal indicator on the laser interferometer changes from weak to strong, tighten the dovetail locking screw 22 to lock the front and rear positions of the leveling rod to be measured, so that the longitudinal depth of the entire barcode area of ​​the leveling rod to be measured is completely parallel to the optical axis of the laser interferometer 7.

[0047] (6) The industrial control computer 11 controls the servo motor 5 to drive the moving slide 3 to slide laterally, so that the barcode area of ​​the leveling rod being measured passes through the microscope lens 10.1 of the CCD camera 10 from the head to the tail of the rod. The CCD camera 10 captures the image of the barcode of the leveling rod being measured and transmits it back to the industrial control computer 11. The reflector 9 moves laterally synchronously with the moving slide 3. The laser interferometer 7 transmits the laser measurement data back to the industrial control computer 11. The industrial control computer 11 converts the barcode image into length and distance data through the processing software and then compares it with the laser measurement data to calculate the length. Thus, the line accuracy of the leveling rod being measured is obtained.

[0048] The above illustrations are merely typical embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An invar bar code leveling staff calibration device, characterized by: The detection device comprises a measuring workbench, a laser linear measurement assembly, a CCD camera and an industrial computer; The measuring workbench is provided with a main base body, two front and rear parallel arranged horizontal guide rails are fixedly installed on the top surface of the main base body, a long-width moving slide table capable of sliding transversely along the guide rails is arranged on the two guide rails, a horizontal transverse screw rod capable of rotating in situ is arranged below the moving slide table, one end of the screw rod is connected with a servo motor, the moving slide table is threadedly connected with the screw rod through a screw nut fixedly installed on the bottom surface of the moving slide table, the servo motor drives the screw rod to rotate to control the moving slide table to slide transversely on the guide rails of the main base body; the moving slide table is made of ferromagnetic material, a horizontal transverse reference line in the same sliding direction is arranged on the top surface of the moving slide table, a group of scale lines for marking the transverse distance are arranged on the front side of the reference line; two movable magnetic clamping supports are arranged on the top surface of the moving slide table along the reference line, the transverse distance between the transverse center sections of the two clamping supports on the scale line of the moving slide table is equal to the distance between the two support points when the measured leveling rod is supported by the Bessel points; The laser linear measurement assembly is provided with a laser interferometer, an interference mirror and a reflecting mirror, the laser interferometer is arranged beside one of the transverse end heads of the main base body of the measuring workbench through a floor stand, the interference mirror is fixedly arranged at the transverse end head on the same side of the main base body of the measuring workbench and the laser interferometer, the reflecting mirror is arranged on the moving slide table of the measuring workbench and moves synchronously with the moving slide table, the laser interferometer, the interference mirror and the reflecting mirror are in a three-point collinear state, and the collinear direction is parallel to the moving direction of the moving slide table; The CCD camera is arranged in front of the middle part of the measuring workbench through a floor stand, the microscope lens of the CCD camera faces backward to the measured leveling rod clamped and supported on the two clamping supports; The industrial computer is connected with the driving system of the servo motor of the measuring workbench through a circuit and controls the servo motor, the industrial computer is also connected with the laser interferometer and the CCD camera through a circuit and realizes data exchange.

2. The Invar bar code level staff calibration apparatus of claim 1 wherein: The clamping support is sequentially provided with a magnetic base plate, a dovetail base, a dovetail sliding plate, a lifting hand wheel, a lifting shaft, and a clamping seat from bottom to top. The magnetic base plate is a flat base plate with a plurality of strong magnetic neodymium magnetic sheets fixedly embedded on the bottom surface. A vertical reference center line is arranged on the front end surface of the magnetic base plate at the horizontal center position. The dovetail base is fixedly connected above the magnetic base plate by screws. A horizontal longitudinal dovetail groove is arranged on the top surface of the dovetail base. A longitudinal long through hole is arranged in the groove bottom of the dovetail groove. A front end plate and a rear end plate are respectively arranged at the front end and the rear end of the dovetail groove. The bottom surface of the dovetail sliding plate is provided with a horizontal longitudinal dovetail tenon. The dovetail sliding plate is slidingly inserted into the dovetail groove of the dovetail base through the dovetail tenon, so that the dovetail sliding plate is slidingly supported above the dovetail base. A vertical through hole is arranged in the middle of the dovetail sliding plate and opposite to the long through hole of the dovetail base. A lifting locking screw is connected to the rear end surface of the dovetail sliding plate through a screw hole and extends into the vertical through hole from the outside. A wire nut is fixedly embedded on the front end surface of the dovetail sliding plate. A longitudinal movement screw with a hand wheel is arranged on the front end plate of the dovetail base and can rotate in place. The rod body of the longitudinal movement screw is threadedly connected with the wire nut of the dovetail sliding plate. A dovetail locking screw is connected to one side of the dovetail base through a screw hole and extends into the side wall of the dovetail groove from the outside. The lifting hand wheel is an annular hand wheel with a vertical screw hole in the middle and freely supported on the middle part of the top surface of the dovetail sliding plate. The diameter of the vertical screw hole is larger than that of the vertical through hole of the dovetail sliding plate. The lifting shaft is a vertical stepped shaft with a large upper part and a small lower part. The middle part of the lifting shaft is a threaded section. The upper part of the lifting shaft is a support disc with an outer diameter larger than that of the threaded section. The lower part of the lifting shaft is a light shaft section with an outer diameter smaller than that of the threaded section. A vertical slot is arranged on the outer wall of the shaft body of the light shaft section. The lifting shaft is inserted into the lifting hand wheel from top to bottom. The threaded section of the lifting shaft is threadedly connected with the vertical screw hole of the lifting hand wheel. The light shaft section of the lifting shaft extends into the long through hole of the dovetail base through the vertical through hole of the dovetail sliding plate. The front end of the lifting locking screw on the dovetail sliding plate extends into the vertical slot of the light shaft section of the lifting shaft to limit the rotation of the lifting shaft. The clamping seat is a U-shaped clamping seat with an opening facing forward. The support disc of the lifting shaft is fixedly connected with the lower plate of the clamping seat by screws, so that the clamping seat is centrally supported above the lifting shaft. A pressing screw is connected to the middle part of the upper plate of the clamping seat through a screw hole and extends into the clamping seat from top to bottom. A hand wheel is fixedly connected to the upper end of the pressing screw. A pressing block is hingedly connected to the lower end of the pressing screw and can rotate around the lower end of the pressing screw. A longitudinal reference center line is arranged on the top surface of the lower plate of the clamping seat at the horizontal center position. The longitudinal reference center line and the vertical reference center line of the magnetic base plate are on the same vertical plane.

3. The Invar bar code leveling staff calibration apparatus of claim 2 wherein: The interference mirror and the reflecting mirror are both provided with a magnetic base with a vertical upward extending screw. The mirror body of the interference mirror and the reflecting mirror is connected to the rod body of the upward extending screw and the height thereof can be adjusted and locked. The interference mirror is fixedly attracted on the iron support at the horizontal end of the main seat body of the measuring workbench through the magnetic base thereof. The reflecting mirror is fixedly attracted on the top surface of the moving sliding table of the measuring workbench through the magnetic base thereof.

4. The Invar bar code level staff calibration apparatus of claim 2 wherein: The moving sliding table is slidingly supported on the front and rear guide rails of the main seat body through the linear bearing blocks at the front and rear ends of the bottom surface thereof.

5. The Invar bar code level staff calibration apparatus of claim 2 wherein: The lifting hand wheel, the hand wheel of the longitudinal moving screw rod, the hand wheel of the pressing screw rod, the round screw head of the lifting locking screw and the round screw head of the dovetail locking screw are all provided with straight-line knurling on the outer periphery.

6. The Invar bar code leveling staff calibration apparatus of claim 2 wherein: The upper and lower sides of the front of the microscope lens of the CCD camera are respectively provided with cold light source fill-in light.

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