Laser measurement equipment for detecting thickness of steel plate and calibration device of equipment

Abstract

The embodiment of the invention provides laser measurement equipment for detecting the thickness of a steel plate and a calibration device of the equipment, and relates to the technical field of steel plate thickness measurement, the laser measurement equipment comprises a rack, a mounting cylinder with a horizontal axis is rotationally connected to the rack, and a servo motor for driving the mounting cylinder to rotate is arranged on the rack; a discharging groove penetrating through the mounting cylinder is formed in the side wall of the mounting cylinder, a clamping device for fixing a steel plate is arranged in the mounting cylinder, guide rails parallel to the axis of the mounting cylinder are fixed to the two sides of the discharging groove, sliding seats are slidably arranged on the guide rails, laser range finders are mounted on the sliding seats, and the two laser range finders are opposite and located on the two sides of the steel plate. Laser beams emitted by the two laser range finders are perpendicular to the surface of the steel plate and collinear, a driving mechanism for driving the two laser range finders to move in the axial direction of the mounting cylinder is arranged on the mounting cylinder, and a cleaning device for cleaning the steel plate is arranged in the mounting cylinder. The device has the effects of quickly positioning the steel plate, detecting the steel plate at a fixed point and improving the detection precision.

Description

Technical Field

[0001] This invention relates to the technical field of steel plate thickness measurement, and particularly to a laser measuring device for detecting the thickness of steel plates and a calibration device for the device. Background Technology

[0002] With the continuous development of industrial production, steel plates are being used more and more widely in various fields. Different thicknesses of steel plates are required depending on the specific circumstances, therefore, the thickness of the steel plate needs to be measured after production.

[0003] Currently, the thickness of steel plates is typically measured using traditional micrometers, calipers, or laser measuring equipment. When using laser measuring equipment, the steel plate to be measured is usually placed on a smooth surface, and the laser measuring device passes over it to measure the thickness at different locations.

[0004] While the aforementioned laser measuring equipment can measure the thickness of steel plates, it has the following problems: For some large steel plates, a large loading platform is required during inspection. In order to ensure the accuracy of the inspection, the flatness of the loading platform is required to be very high, so the processing requirements of the loading platform are relatively high. For some larger and thinner steel plates, the weight of the plate itself can cause the middle part to sag (deformation), resulting in deviation in thickness measurement. If there are defects such as dents on the bottom of the steel plate, it is difficult to measure the thickness at the defect. As a result, it is difficult to accurately determine the thickness at different locations of the steel plate, and it is also difficult to measure the thickness difference of the steel plate. In actual steel plate thickness testing, point measurement is sometimes used, which involves moving a laser rangefinder to a designated position for measurement. The laser rangefinder usually moves in a straight line in one direction and then in another direction, so it is difficult to move quickly to the designated coordinates, which greatly reduces the efficiency of the test. During the inspection of steel plates, impurities on the surface can easily interfere with the thickness of the steel plates. Therefore, it is necessary to clean the surface of the steel plates first. Since the cleaning liquid can also interfere with the inspection of the steel plate surface, it is also necessary to dry the surface. During the transfer of the cleaned steel plates, impurities may still adhere to the surface of the steel plates. At the same time, the cleaning and drying process takes a lot of time and increases the labor intensity of the workers. In order to facilitate the drying of the cleaned steel plates, the steel plates can be heated or wiped with a dry towel. Heating requires cooling afterward. If the steel plate is large, it is necessary to flip the steel plate during the wiping of both sides, which increases the labor intensity of the workers. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a laser measurement device for detecting the thickness of steel plates and a calibration apparatus for the device.

[0006] Firstly, the laser measuring device for detecting the thickness of steel plates provided in this application adopts the following technical solution: A laser measuring device for detecting the thickness of steel plates includes a frame, on which a horizontally aligned mounting cylinder is rotatably connected. A servo motor is mounted on the frame to drive the mounting cylinder to rotate around its own axis. A feeding groove penetrating the mounting cylinder is formed on the side wall of the mounting cylinder. Several clamping devices are installed inside the mounting cylinder to fix pairs of steel plates and move them along the feeding groove. Guide rails parallel to the axis of the mounting cylinder are fixed inside the mounting cylinder on both sides of the feeding groove. Guide rail grooves are formed on the guide rails along the axis of the mounting cylinder, and a sliding component is disposed within the guide rail groove. A sliding base is provided, on which a laser rangefinder is mounted. Two laser rangefinders are positioned opposite each other on both sides of a steel plate. The laser beams emitted by the two laser rangefinders are perpendicular to the surface of the steel plate and collinear. A drive screw is rotatably connected in the guide rail groove. The drive screw passes through the sliding base and is threadedly connected to the sliding base. A drive motor for driving the drive screw to rotate is fixed at the end of the guide rail. A drive mechanism for driving the two laser rangefinders to move along the axial direction of the mounting cylinder is provided on the mounting cylinder. A cleaning device for cleaning the steel plate is provided inside the mounting cylinder.

[0007] Furthermore, a guide rail groove is formed on the guide rail along the axis of the mounting cylinder, and a drive screw is rotatably connected to the guide rail groove of the drive mechanism. The drive screw passes through the sliding seat and is threadedly connected to the sliding seat. A drive motor for driving the drive screw to rotate is fixed at the end of the guide rail.

[0008] Furthermore, the clamping device includes several sliding members slidably disposed on the mounting cylinder. A telescopic cylinder perpendicular to the steel plate is fixed to the end of each sliding member. A suction cup facing the steel plate is fixed to the end of the telescopic cylinder. A power source is connected to the suction cup. The suction cups are symmetrically disposed on both sides of the feeding groove. The clamping device also includes a lifting mechanism for moving the steel plate toward the feeding groove. The lifting mechanism includes a drive rack fixed to one of the sliding members. A lifting motor is fixed on the frame. A drive gear meshing with the drive rack is fixed on the lifting motor.

[0009] Furthermore, the sliding component includes a sliding cylinder slidably disposed within the mounting cylinder and a sliding rod slidably disposed within the sliding cylinder. The sliding rod and the sliding cylinder have rectangular cross-sections. A guide rod with a rectangular upper cross-section and an upper rectangular area smaller than the lower area is integrally formed at the upper end of the sliding rod. A lifting cylinder is fixed inside the sliding cylinder. A steel wire is fixed to the end of the connecting rod of the lifting cylinder. The other end of the steel wire is fixed to the guide rod. The driving rack is fixed to one of the sliding cylinders. The telescopic cylinder is fixed to the sliding rod.

[0010] Furthermore, a limiting plate is fixed inside the mounting cylinder on both sides of the feeding trough by a rotating shaft. The rotating shaft of the limiting plate is parallel to the axis of the mounting cylinder. Several torsion springs are fixed on the rotating shaft of the limiting plate to pull the limiting plate to rotate in the direction of closing the feeding trough. A guide roller is rotatably connected to the end of the limiting plate away from the rotating shaft. The guide roller abuts against both sides of the downward moving steel plate and corrects the steel plate to a certain extent.

[0011] Furthermore, the cleaning device includes two rows of spray heads fixed inside the mounting cylinder, with the two rows of spray heads located on both sides of the steel plate. Each spray head is connected to a spray pump for cleaning the surface of the steel plate via a pipe. A vent pipe is fixed inside the mounting cylinder below each spray head, and the vent pipe is connected to a power source for drying the cleaned steel plate via a pipe. A guide plate is fixed inside the mounting cylinder to prevent the spray liquid from flowing towards the laser rangefinder. The guide plate is located above the laser rangefinder and tilts downwards towards the side closest to the discharge trough. The guide plate and the mounting cylinder are hollow and interconnected. The guide rail groove communicates with the internal cavity of the mounting cylinder. Air outlets communicating with the internal cavity are opened on the side wall of the mounting cylinder facing the laser rangefinder, the lower surface of the guide plate, and the side wall of the guide plate facing the steel plate. The power source is simultaneously connected to the internal cavity of the mounting cylinder and several vent pipes via a pipe.

[0012] Furthermore, a positioning rod for the surrounding laser rangefinder is installed on the sliding seat, and the positioning rods on the two sliding seats are opposite each other and abut against the sides of the corresponding steel plates. The ends of the positioning rods are embedded with balls that abut against the surface of the steel plates, and a drive cylinder for driving the positioning rods to move synchronously is fixed on the sliding seat.

[0013] Furthermore, the frame includes a mounting bracket connected to the mounting cylinder and a telescopic bracket connected to the bottom of the mounting bracket for controlling the lifting and lowering of the mounting bracket. The bottom of the telescopic bracket is provided with a water tank for collecting spray liquid. A guide platform is fixed inside the water tank. The guide platform is inclined around its perimeter. The length direction of the guide platform is parallel to the axis of the mounting cylinder. The upper surface of the guide platform is a standard horizontal plane and is located directly below the discharge trough. Arc-shaped guide buckets with the same inner wall diameter as the outer wall of the mounting cylinder are fixed on both sides of the guide platform. A guide groove is opened on the arc-shaped guide bucket to supply water flow to the inclined surface of the guide platform. A filter screen is detachably connected inside the guide groove.

[0014] Secondly, this application also discloses a calibration device using the above-mentioned equipment, including a calibration groove on the sliding seat, a calibration block of a defined thickness placed in the calibration groove, and target centers on both sides of the calibration block. When the calibration block is installed in the calibration groove, the line connecting the two target centers is horizontally arranged and perpendicular to the axis of the mounting cylinder. The laser emitted by the two laser rangefinders is adjusted to irradiate the corresponding target centers to complete the collinear calibration of the two laser rangefinders.

[0015] In summary, this application includes at least one of the following beneficial technical effects: The mounting cylinder is designed to facilitate the installation of the steel plate and to block external light, preventing interference with the laser rangefinder. Rotating the mounting cylinder horizontalizes the feeding chute, further aiding in steel plate installation. During installation, the lower surface of the steel plate rests against one of the guide rollers, providing support and facilitating its movement towards the suction cup. A telescopic cylinder moves the suction cup towards the steel plate, which is then secured by a power source. Rotating the cylinder vertically positions the steel plate, and the suction cup moves it upwards under the influence of gravity. The system uses a vertical setting to ensure the steel plate is vertical. A level is used to check if the steel plate is vertical, and the laser rangefinder moves synchronously, controlling the up and down movement of the steel plate. This allows for the division of the steel plate surface into different coordinates, enabling rapid location of the position where the thickness needs to be measured. The distance between the two laser rangefinders remains constant. Subtracting the distance detected by the laser rangefinders from the distance between the two laser rangefinders gives the thickness of the steel plate at that measurement point, improving the efficiency of measuring different positions on the steel plate. Data detected by the laser rangefinders on the same side can be used to determine the flatness of the steel plate surface. I. Solve the problem of "requiring a highly flat loading platform for large steel plates" to reduce equipment costs and space requirements. In traditional measurements, large steel plates rely on highly flat loading platforms, which are costly to process and require a lot of space. This device completely eliminates this limitation through the design of a mounting cylinder and clamping device: the steel plate is clamped by suction cups and rotated to a vertical position with the mounting cylinder, eliminating the need for a loading platform and saving significant space; in the vertical position, the steel plate remains stable through its own weight or rigid constraints from sliding parts, avoiding measurement deviations caused by insufficient platform flatness and reducing the accuracy requirements of auxiliary equipment. Second, avoid deformation errors caused by the sagging of large-sized thin steel plates due to their own weight. When placed horizontally in the traditional manner, thin steel plates are prone to local thickness measurement distortion due to sagging in the middle.

[0016] The vertical clamping solution of this device solves this problem at its root: In the vertical position, the weight of the steel plate is along its own axis (rather than the bending direction), which, combined with the symmetrical clamping of the suction cups on both sides, can reduce deformation. When the sliding rod extends out of the sliding cylinder, the steel plate naturally sags under its own weight, further offsetting local bending and ensuring that the measurement area is in a flat state. The near-field constraint of the positioning rod can perform local leveling for the measurement point, avoiding interference from small deformations on laser ranging. 3. Achieve precise measurement of defects in steel plates (such as bottom depressions). Traditional devices cannot detect defects such as bottom depressions because the bottom of the steel plate is attached to the platform. This device achieves full surface coverage through bidirectional laser ranging and vertical clamping: two laser rangefinders are located on both sides of the steel plate, emitting collinear laser beams to directly measure the distance difference (i.e., thickness) between the two surfaces, without relying on a bottom platform; with the steel plate vertical and unobstructed at the bottom, the laser can directly illuminate the depression area. Combined with the lifting mechanism that moves the steel plate up and down, it can accurately locate the defect and measure its thickness, solving the problem of "bottom defects cannot be detected" in traditional devices. Improve the efficiency of "measurement at designated points" and solve the problem of "limited movement trajectory of laser rangefinders". In traditional devices, laser rangefinders mostly move in a single direction in a linear fashion, making it time-consuming to locate specific coordinates. This device achieves rapid positioning through a dual-axis linkage mechanism: the drive motor moves the sliding seat along the guide rail groove (parallel to the axis of the mounting cylinder) to achieve horizontal movement; the lifting mechanism drives the steel plate to move along the unloading groove (vertical direction) through the drive gears and racks; the two work together to achieve rapid positioning of the laser rangefinder at any point on the steel plate surface without multiple reversals, significantly shortening the positioning time and improving detection efficiency. 5. Integrates "cleaning-drying-prevention of secondary pollution" functions to reduce labor costs and time consumption. Traditional measurement methods involve cumbersome cleaning and drying processes, and secondary contamination is easily caused during transfer. This device's integrated design achieves fully automated processing: spray heads simultaneously clean both sides of the steel plate, removing surface impurities; the air outlets of the exhaust duct, mounting cylinder, and guide plate create a three-dimensional airflow, quickly drying surface moisture without heating or manual wiping, avoiding cooling waiting time; cleaning and measurement are completed within the same mounting cylinder, eliminating the need to transfer the steel plate and reducing the risk of secondary contamination; the cleaning liquid is recovered through a water tank and guide platform, and can be recycled after filtration, reducing consumable costs. VI. Ensuring long-term measurement accuracy through a "multiple calibration mechanism" Traditional devices are prone to accuracy drift due to equipment vibration and component wear. This device ensures stability through a multi-stage calibration design: the calibration block is positioned via a target center, allowing for periodic collinearity calibration of the two laser rangefinders and eliminating inherent equipment deviations; the standard horizontal plane of the guide platform serves as a horizontal reference for the device, assisting in calibrating the levelness of the mounting cylinder axis; and the telescopic frame's lifting function allows for fine-tuning of the overall height of the device to adapt to level requirements in different environments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0018] Figure 2 This is a cross-sectional view of an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the clamping device according to an embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the connection structure of the positioning rod on the sliding seat in an embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the connection structure of the calibration block on the sliding seat in this application.

[0022] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Mounting cylinder; 3. Feed chute; 4. Guide rail; 5. Guide rail groove; 6. Drive screw; 7. Laser rangefinder; 8. Calibration groove; 9. Calibration block; 10. Target center; 11. Drive rack; 12. Lifting motor; 13. Drive gear; 14. Telescopic cylinder; 15. Suction cup; 16. Sliding cylinder; 17. Sliding rod; 18. Guide rod; 19. Lifting cylinder; 20. Steel wire; 21. Limiting plate; 22. Guide roller; 23. Spray head; 24. Air outlet pipe; 25. Air outlet; 26. Guide plate; 27. Positioning rod; 28. Drive cylinder; 29. ​​Mounting frame; 30. Telescopic frame; 31. Water tank; 32. Guide platform; 33. Arc-shaped guide bucket; 34. Guide groove; 35. Sliding seat. Detailed Implementation

[0023] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one, two, or more than two. The term “and / or” is used to describe the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can indicate: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0024] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0025] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0026] This application discloses a laser measuring device for detecting the thickness of steel plates, referring to... Figure 1 and Figure 2 The system includes a frame 1 fixed to the ground, with an opening on one side. A horizontally oriented mounting cylinder 2 is rotatably connected inside the frame 1. A drive gear ring is coaxially fixed on the mounting cylinder 2. A servo motor is fixed on the frame 1, and a rotating gear meshing with the drive gear ring is fixed on the output shaft of the servo motor. A feeding groove 3 is provided on the side wall of the mounting cylinder 2, penetrating the mounting cylinder 2, the frame 1, and the drive gear ring. The servo motor drives the mounting cylinder 2 to rotate. Since steel plates are usually picked up from the surface by suction cups 15 and are usually horizontally positioned, the servo motor drives the mounting cylinder 2 to rotate the feeding groove 3 to the opening position on the side wall of the support, facilitating the feeding of the steel plate. On the other hand, after the steel plate is installed, the servo motor can be used to rotate the mounting cylinder 2 to make the steel plate vertically positioned. The verticality of the steel plate can be adjusted by its own weight. Then, the steel plate can be finely adjusted by the slight rotation of the mounting cylinder 2 to ensure that the steel plate is in a vertical position.

[0027] Reference Figure 1 and Figure 2 The mounting cylinder 2 is equipped with several clamping devices that fix the steel plates and facilitate the movement of the steel plates along the direction of the feeding groove 3. The mounting cylinder 2 on both sides of the feeding groove 3 is fixed with guide rails 4 parallel to the axis of the mounting cylinder 2. The guide rails 4 are provided with guide rail grooves 4 along the axis of the mounting cylinder 2. The sliding seat 35 is slidably arranged in the guide rail groove 4. The drive screw 6 is rotatably connected in the guide rail groove 4. The drive screw 6 passes through the sliding seat 35 and is threadedly connected to the sliding seat 35. The end of the guide rail 4 is fixed with a drive motor that makes the drive screw 6 rotate.

[0028] Reference Figure 2 and Figure 3 A laser rangefinder 7 is installed on the sliding seat 35. The two laser rangefinders 7 are opposite each other and located on both sides of the steel plate. The laser beams emitted by the two laser rangefinders 7 are perpendicular to the surface of the steel plate and collinear.

[0029] Reference Figure 2 and Figure 4 The clamping device includes several sliding parts slidably disposed on the mounting cylinder 2. The sliding parts are perpendicular to the axis of the mounting cylinder 2. A telescopic cylinder 14 perpendicular to the steel plate is fixed to the end of the sliding part. A suction cup 15 facing the steel plate is fixed to the end of the telescopic cylinder 14. The suction cup 15 is connected to a power source, which can be an air source such as an air pump. The suction cup 15 is symmetrically disposed on both sides of the feeding groove 3. The clamping device also includes a lifting mechanism that moves the steel plate toward the feeding groove 3. The lifting mechanism includes a drive rack 11 fixed on one of the sliding parts. A lifting motor 12 is fixed on the frame 1. A drive gear 13 that meshes with the drive rack 11 is fixed on the lifting motor 12.

[0030] During the installation of the steel plate, the lifting motor 12 drives the suction cup 15 to move towards the material discharge trough 3 via the drive gear 13 and drive rack 11. The steel plate enters the mounting cylinder 2 from the material discharge trough 3, and the lower surface of the steel plate is supported on the suction cup 15 at the bottom. At this time, the suction cup 15 supports the steel plate, and the suction cups 15 on both sides clamp the steel plate and drive the steel plate to move towards the mounting cylinder 2. When the end of the steel plate is almost completely inside the mounting cylinder 2, the mounting cylinder 2 rotates, making the steel plate vertically positioned. During the inspection process, the up and down movement of the steel plate, combined with the sliding seat 35 sliding in the guide rail groove 4, can quickly position the position to be measured on the steel plate, improving the measurement efficiency.

[0031] Reference Figure 2 and Figure 4The sliding component includes a sliding cylinder 16 slidably disposed within the mounting cylinder 2 and a sliding rod 17 slidably disposed within the sliding cylinder 16. Both the sliding rod 17 and the sliding cylinder 16 have rectangular cross-sections. A guide rod 18 with a rectangular cross-section is integrally formed at the upper end of the sliding rod 17. The area of ​​the upper rectangular section of the guide rod 18 is smaller than the area at its lower end, ensuring that after the guide rod 18 moves outside the sliding cylinder 16, it can smoothly move upwards and return to the sliding cylinder 16. A vertically arranged lifting cylinder 19 is fixed inside the sliding cylinder 16. A steel wire 20 is fixed to the end of the connecting rod of the lifting cylinder 19. One end of the steel wire 20 is fixed to the lifting cylinder 19, and the other end is fixed to the guide rod 18. A drive rack 11 is fixed to one of the sliding cylinders 16, and a telescopic cylinder 14 is vertically fixed to the sliding rod 17.

[0032] When the steel plate enters the mounting cylinder 2 from the feeding trough 3 and is initially clamped by the suction cup 15, the servo motor drives the mounting cylinder 2 to rotate until the steel plate is close to vertical. At this time, the telescopic cylinder 14 drives the sliding rod 17 (driving the guide rod 18) to move downward, so that the sliding rod 17 extends out of the sliding cylinder 16. After the sliding rod 17 extends, the rigid constraint of the sliding component on the steel plate weakens (it is only flexibly clamped by the suction cup 15). The steel plate can naturally sag under its own weight, achieving initial vertical adjustment. Firstly, it utilizes natural force to achieve error-free calibration. The steel plate's own weight is a "natural calibration force," which allows the steel plate to naturally tend towards verticality without complex mechanical adjustments, avoiding stress deformation that may be caused by mechanical forced correction (especially for thin steel plates, forced clamping can easily lead to bending), ensuring that the original shape of the steel plate is not damaged. Secondly, it can quickly adapt to steel plates of different specifications. Regardless of the thickness or size of the steel plate, the adjustment logic of sag due to self-weight is consistent, eliminating the need to reset mechanical parameters for different steel plates, simplifying the calibration process after loading, and improving the equipment's adaptability to diverse workpieces. Thirdly, it lays the foundation for subsequent fine-tuning. The self-weight adjustment allows the steel plate to quickly approach a vertical state (with small deviation). Subsequently, only a slight rotation of the mounting cylinder 2 driven by the servo motor is needed to complete precise calibration, reducing the workload of mechanical adjustment and error accumulation.

[0033] After the steel plate completes vertical alignment through its own weight and fine-tuning by the servo motor, the telescopic cylinder 14 drives the sliding rod 17 to retract into the sliding cylinder 16. At this time, the sliding rod 17 and the sliding cylinder 16 form a rigid constraint through the rectangular cross section (anti-rotation), which, together with the stable clamping of the suction cup 15, keeps the steel plate in a stable vertical state. Firstly, it eliminates swaying errors during measurement. The rigid constraints of the sliding rod 17 and the sliding cylinder 16 (the rectangular cross-section restricts relative rotation) plus the tension of the steel wire 20 (connecting the lifting cylinder 19 and the guide rod 18) prevent the steel plate from swaying slightly due to gravity fluctuations (such as slight equipment vibrations), ensuring that the laser beam is always perpendicular to the steel plate surface and guaranteeing ranging accuracy. Secondly, it is used in conjunction with the guide rail 4 of the laser rangefinder 7 for calibration. During testing, the laser rangefinder 7 needs to slide along the guide rail 4 (covering the entire length of the steel plate). When the sliding rod 17 is located inside the sliding cylinder 16, the vertical state of the steel plate is stable, ensuring that the laser beams of the two laser rangefinders 7 are always collinear and perpendicular to the steel plate surface, avoiding measurement deviations caused by steel plate offset. Thirdly, it adapts to dynamic testing requirements. During testing, the lifting mechanism may drive the steel plate to move along the direction of the feeding groove 3 (positioning the measurement point). The rigid constraints of the sliding rod 17 and the sliding cylinder 16 ensure the stability of the steel plate's posture during movement, avoiding tilting caused by motion inertia and ensuring consistency of thickness data at different measurement points.

[0034] The two scenarios are switched by the "extend / retract" state of the slider 17, realizing the functional adaptation between "preliminary calibration" and "precise measurement": Sliding rod 17 extends (self-weight adjustment): utilizes natural force for quick calibration, adapts to various steel plates, and reduces mechanical stress; Sliding rod 17 retraction (rigid constraint): Maintains verticality through structural stability, eliminates measurement errors, and ensures detection accuracy.

[0035] The combination of these two elements forms a closed loop of "efficient calibration - accurate measurement," which improves the adaptability and reliability of the device for steel plate thickness detection.

[0036] Reference Figure 2 and Figure 3 Limiting plates 21 are fixed inside the mounting cylinders 2 on both sides of the feeding trough 3 via rotating shafts. The rotating shaft of the limiting plate 21 is parallel to the axis of the mounting cylinder 2. Several torsion springs are fixed on the rotating shaft of the limiting plate 21 to pull the limiting plate 21 to rotate in the direction of closing the feeding trough 3. A guide roller 22 is rotatably connected to the end of the limiting plate 21 away from the rotating shaft. The guide roller 22 abuts against both sides of the downward moving steel plate and corrects the steel plate to a certain extent.

[0037] When the steel plate enters the mounting cylinder 2 from the feeding groove 3, it needs to move precisely along the feeding groove 3 to cooperate with the subsequent gripping device (suction cup 15). Under the elastic force of the torsion spring, the limiting plate 21 always tends to close towards the center of the feeding groove 3, and the guide roller 22 at its end will naturally abut against both sides of the steel plate. When the steel plate is inserted into the feeding groove 3, the guide roller 22 will form a "channel constraint" on the steel plate through rolling contact, guiding the steel plate to move along the feeding groove 3, and preventing the steel plate from getting stuck at the groove opening or deviating from the gripping range of the clamping device due to feeding deviation (such as tilting or offset).

[0038] For steel plates with slight size deviations or irregular postures during loading, the symmetrical force of the guide rollers 22 on both sides can automatically "center" them, ensuring that the steel plate can be accurately aligned with the clamping position of the suction cup 15 after entering the mounting cylinder 2, reducing the frequency of manual adjustment or mechanical retry and improving loading efficiency.

[0039] The torsion spring's elastic force has a "flexible adjustment" characteristic. When steel plates of different thicknesses pass through the feeding chute 3, the limiting plate 21 is pushed open by the steel plate, and the torsion spring's deformation force adaptively adjusts with the steel plate thickness, ensuring that the guide roller 22 always closely abuts against both sides of the steel plate, without excessive compression or excessive gaps due to differences in steel plate thickness. Compared to rigid limiting structures (such as fixed baffles), the combination of torsion spring and guide roller 22 can avoid "jamming" or "loosening" caused by steel plate thickness errors, ensuring the smooth feeding process of steel plates of different specifications. On the other hand, the steel plate posture can be corrected in real time, laying the foundation for subsequent vertical calibration. During transportation and storage, the steel plate may be slightly bent or lateral due to its own weight or external forces (especially thin steel plates). If it directly enters the mounting cylinder 2, it will increase the difficulty of "adjusting the vertical state by its own weight" (for example, the bent part may cause the steel plate to not hang down naturally to the vertical). During the downward movement of the steel plate (driven by the lifting mechanism), the guide roller 22 will apply symmetrical squeezing force to both sides of the steel plate. For slightly bent steel plates, the rolling friction of the guide rollers 22 on both sides will gradually "straighten" the lateral bending part of the steel plate, reduce the local deformation of the steel plate, and make it more flat. For steel plates that are slightly tilted when loading, the constraint of the guide roller 22 can force them to adjust to a posture parallel to the unloading groove 3, ensuring that after the steel plate enters the mounting cylinder 2, its surface is closer to the "vertical state to be calibrated", reducing the workload of subsequent servo motor fine adjustment and improving the efficiency of overall posture calibration.

[0040] The guide roller 22 adopts a "rotational connection" design, which uses rolling friction (rather than sliding friction) when in contact with the steel plate. For steel plates with high surface precision requirements (such as galvanized plates and mirror steel plates), it can significantly reduce scratches and wear during the contact process, and avoid affecting the appearance or performance of the steel plate. The rolling friction has less resistance, which can reduce the load on the lifting mechanism (which drives the steel plate to move), reduce the energy consumption of the drive motor, and extend the service life of the equipment.

[0041] Once the feeding is complete and the steel plate enters the mounting cylinder 2, the limiting plate 21 will automatically reset (close towards the center) under the action of the torsion spring. At this time, although the guide roller 22 no longer contacts the steel plate, the limiting plate 21 can partially close the feeding groove 3: to prevent external debris (such as dust or tools) from entering the cylinder from the feeding groove 3 during the rotation of the mounting cylinder 2 or during laser detection, thus interfering with the detection accuracy of the laser rangefinder 7; and to prevent the steel plate from sliding out of the feeding groove 3 due to accidental shaking during fine-tuning or detection, thereby improving the safety of the device operation.

[0042] The combination of the limiting plate 21, torsion spring and guide roller 22 is a targeted optimization of the "feeding-correction-adaptation" process of steel plates: it achieves guidance and centering through flexible constraints, adapts to steel plates of different thicknesses through adaptive elasticity, reduces posture errors through rolling correction, and takes into account both steel plate protection and device safety. Ultimately, it provides a prerequisite guarantee for the accurate detection of the subsequent laser rangefinder 7 (which depends on the stable vertical posture of the steel plate), and improves the stability, versatility and reliability of the entire device.

[0043] Reference Figure 1 and Figure 2 The installation cylinder 2 is equipped with a cleaning device for cleaning the steel plate. The cleaning device includes two rows of spray heads 23 fixed inside the installation cylinder 2. The two rows of spray heads 23 are located on both sides of the steel plate, and the spray heads 23 are inclined downwards. They are connected to a spray pump for cleaning the surface of the steel plate through pipes. Below the spray heads 23, there is a row of air ducts 24 fixed inside the installation cylinder 2. The air ducts 24 are inclined in the same direction as the spray heads 23 and are connected to a power source for drying the cleaned steel plate through pipes. The power source can be a compressor or a high-power blower. A guide plate 26 is fixed inside the installation cylinder 2. The guide plate 26 is set along the length of the installation cylinder 2 and is located at the top. The guide plate 26 is located above the laser rangefinder 7 and is inclined downwards towards the side closer to the discharge trough 3 to prevent liquid from entering the guide rail groove 4 or the laser rangefinder 7.

[0044] Two rows of spray nozzles 23 are located on both sides of the steel plate and are tilted downwards, which can cover and clean both sides of the steel plate in an all-round way. Taking into account the fact that the steel plate may be in a vertical position (adjusted by its own weight), the downward tilting spray direction can use gravity to guide the cleaning liquid (such as water or detergent) to flow down the surface of the steel plate, avoiding local liquid accumulation, while ensuring that the cleaning liquid fully contacts the stains on the surface of the steel plate, thus improving the thoroughness of cleaning.

[0045] If residual moisture remains on the cleaned steel plate surface, it may cause laser refraction or scattering, affecting the accuracy of distance measurement. However, the air outlet duct 24, which is located below and aligned with the tilt direction of the spray head 23, can form a directional airflow along the steel plate surface, accelerating moisture evaporation or guiding water to drip quickly, thus rapidly drying the steel plate surface and avoiding interference from residual moisture in the measurement.

[0046] Reference Figure 1 and Figure 2 The guide plate 26 and the mounting cylinder 2 are hollow and interconnected. The guide rail groove 4 is connected to the internal cavity of the mounting cylinder 2. The side wall of the mounting cylinder 2 facing the laser rangefinder 7, the lower surface of the guide plate 26, and the side wall of the guide plate 26 facing the steel plate are provided with air outlets 25 that are connected to the internal cavity. The power air source is connected to the internal cavity of the mounting cylinder 2 and several air outlet pipes 24 through a pipeline.

[0047] The deflector plate 26 is located above the laser rangefinder 7 and tilted towards the unloading trough 3. It can directly intercept liquids that may splash or drip during spraying, preventing liquids from falling directly into the guide rail trough 4 or the laser rangefinder 7, thus forming the first protective barrier in space. Active protection of the airflow barrier: The power air source is simultaneously connected to the internal cavity of the mounting cylinder 2 and the air outlet duct 24, combined with multiple air outlets 25 (the side wall of the mounting cylinder 2 corresponding to the laser rangefinder 7, the lower surface of the deflector plate 26, and the side wall of the steel plate corresponding to the deflector plate 26), forming a three-dimensional air curtain. The air outlet 25 on the lower surface of the guide plate 26 blows air downwards, forming an "airflow protection layer" above the laser rangefinder 7, blocking a small amount of water vapor that is not intercepted by the guide plate 26 from approaching. The air outlet 25 on the side wall of the mounting cylinder 2, corresponding to the laser rangefinder 7, blows air around the rangefinder, reducing the intrusion of water vapor or dust from the surrounding environment. The guide rail groove 4 is connected to the cavity of the mounting cylinder 2, and the airflow can enter the guide rail groove 4. On the one hand, it dries the internal drive screw 6 and sliding seat 35, preventing residual water vapor after spraying from causing the parts to rust or slide and ensuring that the sliding seat 35 drives the laser rangefinder 7 to move smoothly, ensuring the stability of the measurement process. On the other hand, it can effectively cool the drive screw 6, avoiding the expansion of the drive screw 6 due to temperature rise, which would affect the accuracy of the detection.

[0048] Reference Figure 1 and Figure 2 The sliding seat 35 is equipped with a positioning rod 27 surrounding the laser rangefinder 7. The positioning rods 27 on the two sliding seats 35 are opposite to each other and abut against the sides of the corresponding steel plates. The ends of the positioning rods 27 are embedded with balls that abut against the surface of the steel plates. The sliding seat 35 is fixed with a drive cylinder 28 that drives the positioning rods 27 to move synchronously.

[0049] This application also discloses a calibration device for the aforementioned laser measuring equipment. A calibration groove 8 is provided on the sliding seat 35, and a calibration block 9 of a defined thickness is placed inside the calibration groove 8. Targets 10 are positioned on opposite sides of the calibration block 9. When the calibration block 9 is installed in the calibration groove 8, the line connecting the two targets 10 is horizontal and perpendicular to the axis of the mounting cylinder 2. The lasers emitted by the two laser rangefinders 7 are adjusted to illuminate the corresponding targets 10, completing the collinear calibration of the two laser rangefinders 7. During the rotation of the drive screw 6, the sliding seat 35 and the laser detector slide along the length of the guide rail 4. During this process, the two laser rangefinders 7 remain positioned on the targets 10, and the distance detected by the two laser rangefinders 7 to the targets 10 is within a specified deviation range, thus completing the calibration of the entire guide rail 4. After calibration, the calibration block 9 is removed so that the laser rangefinders 7 can inspect the steel plate.

[0050] To further enhance the metrological performance of the calibration device, enabling it not only to achieve collinear calibration but also to quantify the measurement accuracy of the laser rangefinder 7, the calibration blocks 9 can be configured as a group of multiple blocks, rather than a single block. These calibration blocks have different, known, and precise standard thickness values, such as 5.00 mm, 10.00 mm, and 20.00 mm, and their thickness range should cover the commonly used steel plate thickness measurement range of the measuring equipment. Each calibration block 9 also has a precisely positioned target 10 on both sides. During calibration, by controlling the drive motor, the drive screw 6 can drive the sliding seat 35 to move precisely along the guide rail 4, thereby automatically and sequentially transporting the calibration blocks 9 of different thicknesses directly below the laser beams of the two laser rangefinders 7. The laser rangefinder 7 measures each calibration block 9, thereby obtaining measurement data at multiple different thickness points. By analyzing the differences between these data and the standard values, the linearity of the laser rangefinder 7 across the entire measurement range can be comprehensively evaluated, and it can be determined whether there is a nonlinear error, rather than simply performing zero-point or single-node calibration. This multi-point calibration mechanism greatly improves the accuracy and reliability of the equipment during long-term use.

[0051] This calibration device also integrates a data processing unit (not shown in the figure, but can be integrated into an industrial computer or PLC within the equipment's electrical control cabinet). This data processing unit is connected to the laser rangefinder 7 via a data cable. During the aforementioned single-point or multi-point calibration, this unit automatically collects and records the measurement data fed back by the laser rangefinder 7. Subsequently, the pre-set program within the data processing unit automatically compares the measurement data with the standard thickness values ​​pre-stored in the database of the currently used calibration block 9, and calculates (e.g., indication error = measured value - standard value) the indication error of the laser rangefinder 7 at the current calibration point. This error value can be displayed intuitively on the human-machine interface, indicating the operator to the current accuracy status of the equipment, and can also be stored to generate a calibration log for periodic quality control and accuracy traceability of the equipment. This function elevates calibration from the level of "manual adjustment" to the level of "automatic detection and quantitative evaluation," truly embodying the essence of metrological calibration.

[0052] Compared to existing technologies, the core advantage of this device lies in: 1. Ensure the laser beam is perpendicular to the steel plate surface to eliminate measurement angle errors. The core accuracy of the laser rangefinder 7 relies on the fact that "the laser beam is perpendicular to the steel plate surface" (if there is tilt, the measured value will be greater than the actual thickness, resulting in angular error). The positioning rods 27 are arranged around the laser rangefinder 7, and the positioning rods 27 of the two sliding seats 35 abut against the two sides of the steel plate respectively, forming a "local rigid constraint" on the measurement point: when the drive cylinder 28 drives the positioning rods 27 to move synchronously, the positioning rods 27 on both sides apply symmetrical clamping force to the steel plate, which can force the surface of the steel plate to remain flat at the measurement point, avoiding surface tilting caused by local slight bending of the steel plate (such as residual stress after cleaning, deformation due to self-weight); the layout of the positioning rods 27 around the laser rangefinder 7 makes the constraint point and the laser irradiation point extremely close (forming a "near-field constraint"), which can accurately control the surface posture of the measurement point, ensuring that the laser beam is always perpendicular to the steel plate surface, eliminating angular error from the root.

[0053] 2. Reduce friction interference and adapt to the dynamic measurement requirements of steel plates. During measurement, the lifting mechanism moves the steel plate along the direction of the feeding trough 3 (positioning different measurement points), while the sliding seat 35 slides along the guide rail 4 (covering the entire length of the steel plate). The ball bearing design at the end of the positioning rod 27 resolves the contradiction between "constraint and movement": the ball bearing makes rolling contact with the surface of the steel plate, which significantly reduces the resistance during the movement of the steel plate compared to sliding friction, preventing the positioning rod 27 from causing "jamming" or "pulling" on the movement of the steel plate, ensuring that the steel plate can move smoothly to the target measurement point; the rolling contact reduces wear on the surface of the steel plate (especially on cleaned precision surfaces), preventing new scratches or stains caused by friction, and ensuring the stability of laser reflection (if the surface is damaged, it may cause laser scattering, affecting the ranging accuracy).

[0054] 3. Enhance the stability of measurement points and resist external interference. When the laser rangefinder 7 is in operation, equipment vibration (such as servo motor rotation or airflow) may cause slight swaying of the steel plate, which in turn causes the measurement point to shift. The cooperative constraint of the positioning rods 27 can form an "anti-interference barrier": the drive cylinder 28 provides a stable clamping force, so that the steel plate is tightly attached to the positioning rods 27 at the measurement point, reducing the relative displacement caused by external vibration; the symmetrical layout of the positioning rods 27 on both sides can counteract the unilateral force that the steel plate may be subjected to (such as airflow impact or slight deformation of the mounting cylinder 2), ensuring that the measurement point is always in the collinear position of the two laser rangefinders 7, avoiding the "dual laser beam non-collinearity" error caused by the steel plate shift.

[0055] 4. Adaptable to steel plates of different thicknesses, enhancing the versatility of the lifting device. The drive cylinder 28 can adapt to steel plates of different thicknesses by adjusting its output force: for thin steel plates, the cylinder outputs a smaller clamping force, which ensures the restraint effect while avoiding excessive compression that could deform the steel plate; for thick steel plates, the cylinder outputs a larger clamping force, ensuring that the positioning rod 27 can tightly abut against the surface of the steel plate and maintain stable restraint. This "flexible and adjustable" restraint method echoes the adaptive design of the torsion spring in the aforementioned limiting plate 21, further expanding the device's adaptability to different steel plate specifications.

[0056] The combination of positioning rod 27, ball bearing and drive cylinder 28 provides a dual guarantee for the "accuracy" and "stability" of laser measurement: near-field rigid constraint ensures that the laser is incident perpendicularly, rolling contact adapts to dynamic measurement, symmetrical clamping resists external interference, and finally works in synergy with the device's calibration mechanism (such as calibration block 9 target 10 calibration) and cleaning mechanism to greatly improve the accuracy and reliability of steel plate thickness measurement.

[0057] Reference Figure 2 and Figure 3 The frame 1 includes a mounting frame 29 connected to the mounting cylinder 2 and a telescopic frame 30 connected to the bottom of the mounting frame 29 for controlling the lifting and lowering of the mounting frame 29. The telescopic frame 30 is driven to lift and lower by a hydraulic cylinder. A water tank 31 for collecting spray liquid is provided at the bottom of the telescopic frame 30. A guide platform 32 is fixed inside the water tank 31. The guide platform 32 is inclined around its perimeter. The length direction of the guide platform 32 is parallel to the axis of the mounting cylinder 2. The upper end face of the guide platform 32 is a standard horizontal plane and is located directly below the discharge trough 3. Arc-shaped guide buckets 33 with the same inner wall diameter as the outer wall of the mounting cylinder 2 are fixed on both sides of the guide platform 32 to ensure that there is no interference with the mounting cylinder 2 during the lifting and lowering process. A guide groove 34 is opened on the arc-shaped guide bucket 33 to supply water to the inclined surface of the guide platform. A filter screen is detachably connected inside the guide groove 34.

[0058] During the descent of the steel plate, the horizontal platform on the upper end of the guide table 32 can provide some support for the heavy steel plate, ensuring the stability of the movement.

[0059] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or variations made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A laser measuring device for detecting the thickness of steel plates, comprising a frame (1), characterized in that: A mounting cylinder (2) with its axis set horizontally is rotatably connected to the frame (1). A servo motor that drives the mounting cylinder (2) to rotate around its own axis is provided on the frame (1). A feeding groove (3) penetrating the mounting cylinder (2) is provided on the side wall of the mounting cylinder (2). Several clamping devices are provided inside the mounting cylinder (2) to fix the steel plates and move the steel plates along the direction of the feeding groove (3). Guide rails (4) parallel to the axis of the mounting cylinder (2) are fixed inside the mounting cylinder (2) on both sides of the feeding groove (3). Guide rail grooves (4) are provided on the guide rails (4) along the axis of the mounting cylinder (2). A sliding seat (35) is slidably provided in the guide rail groove (4). A laser rangefinder (7) is installed on the 35), the two laser rangefinders (7) are opposite each other and located on both sides of the steel plate, the laser beams emitted by the two laser rangefinders (7) are perpendicular to the surface of the steel plate and collinear, a drive screw (6) is rotatably connected in the guide rail groove (4), the drive screw (6) passes through the sliding seat (35) and is threadedly connected to the sliding seat (35), a drive motor for driving the drive screw (6) to rotate is fixed at the end of the guide rail (4), a drive mechanism for driving the two laser rangefinders (7) to move along the axial direction of the mounting cylinder (2) is provided on the mounting cylinder (2), and a cleaning device for cleaning the steel plate is provided inside the mounting cylinder (2).

2. The laser measuring device for detecting the thickness of steel plates according to claim 1, characterized in that: The clamping device includes several sliding parts slidably disposed on the mounting cylinder (2). A telescopic cylinder (14) perpendicular to the steel plate is fixed at the end of each sliding part. A suction cup (15) facing the steel plate is fixed at the end of the telescopic cylinder (14). A power source is connected to the suction cup (15). The suction cup (15) is symmetrically disposed on both sides of the feeding groove (3). The clamping device also includes a lifting mechanism that moves the steel plate toward the feeding groove (3). The lifting mechanism includes a drive rack (11) fixed on one of the sliding parts. A lifting motor (12) is fixed on the frame (1). A drive gear (13) meshing with the drive rack (11) is fixed on the lifting motor (12).

3. The laser measuring device for detecting the thickness of steel plates according to claim 2, characterized in that: The sliding component includes a sliding cylinder (16) slidably disposed within the mounting cylinder (2) and a sliding rod (17) slidably disposed within the sliding cylinder (16). The sliding rod (17) and the sliding cylinder (16) have rectangular cross-sections. The upper end of the sliding rod (17) is formed with a guide rod (18) having a rectangular upper cross-section and an upper rectangular area smaller than the lower area. A lifting cylinder (19) is fixed inside the sliding cylinder (16). A steel wire (20) is fixed to the end of the connecting rod of the lifting cylinder (19). The other end of the steel wire (20) is fixed to the guide rod (18). The driving rack (11) is fixed to one of the sliding cylinders (16). The telescopic cylinder (14) is fixed to the sliding rod (17).

4. The laser measuring device for detecting the thickness of steel plates according to claim 3, characterized in that: Limiting plates (21) are fixed inside the mounting cylinders (2) on both sides of the feeding trough (3) by a rotating shaft. The rotating shaft of the limiting plate (21) is parallel to the axis of the mounting cylinder (2). Several torsion springs are fixed on the rotating shaft of the limiting plate (21) to pull the limiting plate (21) to rotate in the direction of closing the feeding trough (3). A guide roller (22) is rotatably connected to the end of the limiting plate (21) away from the rotating shaft. The guide roller (22) abuts against both sides of the downward moving steel plate and corrects the steel plate to a certain extent.

5. A laser measuring device for detecting the thickness of steel plates according to claim 1, characterized in that: The cleaning device includes two rows of spray heads (23) fixed inside the mounting cylinder (2). The two rows of spray heads (23) are located on both sides of the steel plate. The spray heads (23) are connected to a spray pump for cleaning the surface of the steel plate through pipes. Each of the spray heads (23) has an exhaust pipe (24) fixed inside the mounting cylinder (2). The exhaust pipe (24) is connected to a power source for drying the cleaned steel plate through pipes. A guide plate (26) is fixed inside the mounting cylinder (2) to prevent the spray liquid from flowing to the laser rangefinder (7). (26) is located above the laser rangefinder (7) and tilted downward toward the side near the feeding trough (3). The guide plate (26) and the mounting cylinder (2) are hollow and interconnected. The guide rail groove (4) is connected to the internal cavity of the mounting cylinder (2). The mounting cylinder (2) has an air outlet (25) connected to the internal cavity on the side wall of the laser rangefinder (7), the lower surface of the guide plate (26), and the side wall of the guide plate (26) connected to the steel plate. The power air source is connected to the internal cavity of the mounting cylinder (2) and several air outlet pipes (24) through a pipe.

6. The laser measuring device for detecting the thickness of steel plates according to claim 1, characterized in that: The sliding seat (35) is equipped with a positioning rod (27) for the surrounding laser rangefinder (7). The positioning rods (27) on the two sliding seats (35) are opposite to each other and abut against the sides of the corresponding steel plates. The ends of the positioning rods (27) are embedded with balls that abut against the surface of the steel plates. The sliding seat (35) is fixed with a drive cylinder (28) that drives the positioning rods (27) to move synchronously.

7. A laser measuring device for detecting the thickness of steel plates according to claim 1, characterized in that: The frame (1) includes a mounting bracket (29) connected to the mounting cylinder (2) and a telescopic bracket (30) connected to the bottom of the mounting bracket (29) and used to control the lifting and lowering of the mounting bracket (29). The bottom of the telescopic bracket (30) is provided with a water tank (31) for collecting spray liquid. A guide platform (32) is fixed inside the water tank (31). The guide platform (32) is inclined around its perimeter. The length direction of the guide platform (32) is parallel to the axis of the mounting cylinder (2). The upper surface of the guide platform (32) is a standard horizontal plane and is located directly below the discharge trough (3). Arc-shaped guide buckets (33) with the same inner wall diameter as the outer wall of the mounting cylinder (2) are fixed on both sides of the guide platform (32). A guide groove (34) is opened on the arc-shaped guide bucket (33) to supply water flow to the inclined surface of the guide platform. A filter screen is detachably connected inside the guide groove (34).

8. A calibration device for using the laser measurement equipment as described in any one of claims 1-7, characterized in that: The sliding seat (35) is provided with a calibration groove (8), and a calibration block (9) of a certain thickness is placed in the calibration groove (8). Targets (10) are provided on both sides of the calibration block (9). When the calibration block (9) is installed in the calibration groove (8), the line connecting the two targets (10) is set horizontally and perpendicular to the axis of the mounting cylinder (2). The laser emitted by the two laser rangefinders (7) is adjusted to irradiate the corresponding target (10) to complete the collinear calibration of the two laser rangefinders (7).

9. The calibration apparatus according to claim 8, characterized in that: There are multiple calibration blocks (9), and their thickness values ​​cover the commonly used measurement range of the laser rangefinder (7). The drive motor can drive the sliding seat (35) to carry different calibration blocks (9) to move sequentially to the measurement optical path of the laser rangefinder (7) so as to perform multi-point calibration and linearity evaluation of the laser rangefinder (7).

10. The calibration apparatus according to claim 9, characterized in that: It also includes a data processing unit, which is connected to the laser rangefinder (7) for receiving and recording the measurement data of the laser rangefinder (7) on the calibration block (9), comparing the measurement data with the standard thickness value of the calibration block (9), and automatically calculating and outputting the indication error of the laser rangefinder (7).

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