Multi-point positioning calibration device for tunnel inner wall flatness laser profiler
By designing a multi-point positioning and calibration device on the laser profilometer and using a combination of servo motor drive and high-pressure air pump air curtain, the problems of low single-point calibration accuracy and dust interference were solved, achieving efficient, stable and accurate calibration across the entire scanning range.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HENAN SITONG ENG TESTING CO LTD
- Filing Date
- 2026-07-02
- Publication Date
- 2026-07-31
AI Technical Summary
Existing laser profiler calibration devices use a single-point calibration method, which results in low calibration accuracy and efficiency. Furthermore, dust at tunnel construction sites can easily adhere to the laser receiving components of the calibration equipment, interfering with signal reception and reducing calibration accuracy.
A multi-point positioning calibration device is designed, which uses multiple laser receivers and position encoders set at equal intervals on a reference base. Combined with servo motor drive and high-pressure air pump to form an air curtain, it can realize multi-point calibration of the entire scanning range. A level sensor and electric telescopic rod are also provided to ensure the stability of the device and prevent dust interference.
It achieves high-precision multi-point calibration across the entire scanning range of the laser profiler, improving calibration efficiency, preventing dust from affecting signal reception, extending equipment lifespan, and ensuring the stability and accuracy of the calibration process.
Smart Images
Figure CN122486531A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of tunnel inspection equipment calibration technology, specifically relating to a multi-point positioning calibration device for a laser profiler for tunnel inner wall flatness. Background Technology
[0002] In the field of tunnel engineering inspection, the smoothness of the tunnel inner wall is a key link in assessing the construction quality and operational safety of the tunnel. Laser profilers have become the core equipment for this inspection work due to their high accuracy and ease of operation. The accurate calibration of laser profilers is a prerequisite for ensuring the validity of their inspection data.
[0003] Currently, most calibration devices for laser profilers adopt a single-point calibration method, which can only calibrate a local scanning range of the laser profiler and cannot achieve full scanning range coverage. The calibration accuracy and efficiency are low, which makes it difficult to meet the requirements of tunnel inspection for high-precision, full-range calibration. At the same time, there is a lot of dust at the tunnel construction site, and the dust can easily adhere to the laser receiving components of the calibration equipment, interfering with the reception of laser signals and reducing calibration accuracy. Summary of the Invention
[0004] The purpose of this invention is to provide a multi-point positioning calibration device for a laser profiler for tunnel wall smoothness, in order to solve the problems mentioned in the background art, where current calibration devices for laser profilers mostly adopt single-point calibration methods, resulting in low calibration accuracy and efficiency. At the same time, there is a lot of dust at the tunnel construction site, which easily adheres to the laser receiving component of the calibration equipment, interfering with the reception of laser signals and reducing calibration accuracy.
[0005] To achieve the above objectives, the present invention provides the following technical solution: A multi-point positioning calibration device for a laser profiler of tunnel wall flatness includes a support base and a fixed sleeve fixed to the surface of the support base. The fixed sleeve contains a support sleeve that is movably connected to it. The fixed sleeve contains a drive motor for driving the support sleeve to rise and fall, so as to adjust the protective shell and the reference base to a calibration height that matches the laser profiler. The top of the support sleeve is fixed with a threaded post; the threaded post is threadedly connected to a protective shell; the surface of the protective shell has a rotating groove, and a reference seat is rotatably connected in the rotating groove; the top surface of the reference seat has multiple mounting grooves at equal intervals, and a laser receiver and a position encoder are respectively installed in each mounting groove, and a protective shell for protecting the laser receiver and the position encoder is inserted into the mounting groove; the reference seat is connected to a connecting post, and the connecting post is rotatably connected inside the protective shell; a driven gear that meshes with a driving gear is fixed to the outer wall of the connecting post; the driving gear is connected to the output end of a servo motor; the servo motor is installed on the bottom wall of the inner cavity of the protective shell; the servo motor precisely controls the rotation angle of the reference seat, so that multiple sets of laser receivers and position encoders are distributed within the full scanning range of the laser profiler, each set corresponding to a calibration reference point, forming multiple calibration reference points; The outer wall of the protective shell is equipped with an anti-interference mechanism. The anti-interference mechanism consists of a venting sleeve and multiple high-pressure air pumps. The venting sleeve is placed outside the protective shell, and the multiple high-pressure air pumps are respectively positioned opposite to the protective shell. The surface of the venting sleeve is provided with multiple positioning grooves at equal intervals. Two dustproof plates are rotatably connected in the positioning grooves through a rotating shaft. The multiple high-pressure air pumps spray high-pressure gas to form an annular air curtain, which can effectively isolate dust in the tunnel. The dustproof plates are automatically opened and closed under the cooperation of torque springs and high-pressure gas.
[0006] Each of the aforementioned protective shells is provided with a fixing mechanism, which consists of a guide block and a fixing pin. The surface of the reference base is provided with a guide groove for the guide block to move. The fixing pin is fixed to one side of the guide block. One side of the outer wall of the protective shell is provided with a fixing groove that matches the fixing pin.
[0007] A fixing ring is fixed to the outer wall of the fixing pin, and a fixing spring for supporting the fixing ring is sleeved on the outside of the fixing pin.
[0008] A guide screw is fixed to the output end of the drive motor, and the guide screw is threadedly connected to the fixed sleeve.
[0009] Multiple electric telescopic rods are installed at equal intervals on the outer wall of the support base, and shock-absorbing pads are fixed to the output ends of the electric telescopic rods. The surface of the support base has grooves, and a level sensor is installed in the grooves. The level sensor monitors the horizontal state of the device in real time. The controller controls the extension and retraction of the multiple electric telescopic rods according to the detection data of the level sensor, which drives the shock-absorbing pads to contact the ground and adjust the support base to a horizontal state. The shock-absorbing pads absorb the vibration on site at the same time, ensuring the overall stability of the device.
[0010] The outer walls of both sides of the support sleeve are fixed with limit sliders, and the inner walls of both sides of the fixed sleeve are provided with limit grooves for the limit sliders to slide.
[0011] A through groove is provided on one side of the outer wall of the protective shell, and a transparent protective plate is installed in the through groove. A calibration hole is provided on the transparent protective plate.
[0012] The outer wall of the reference base is provided with multiple rolling grooves at equal intervals, and a limiting ball is fixedly connected in the rolling groove. The inner wall of the protective shell is provided with a limiting groove for the limiting ball to roll.
[0013] The outlet pipe of the high-pressure air pump extends into the ventilation sleeve and fits against the bottom of the dustproof plate. A torque spring is installed on the outside of the rotating shaft on the dustproof plate.
[0014] The multi-point positioning and calibration device for a laser profiler for tunnel inner wall flatness proposed in this invention, employing the above-mentioned technical solution, has the following beneficial effects: The multi-point positioning calibration device of the laser profiler for tunnel wall smoothness has multiple laser receivers and position encoders evenly spaced on the surface of the reference base. It can simultaneously calibrate multiple scanning points of the laser profiler, which greatly improves the accuracy and efficiency of calibration and solves the problem of limited coverage of traditional single-point calibration. High-pressure gas is sprayed out by a high-pressure air pump to form a ring-shaped air curtain, which can effectively isolate dust in the tunnel and prevent dust from adhering to the receiving end of the laser receiver and affecting the signal reception accuracy. The dustproof plate can automatically open and close with the cooperation of torque spring and high-pressure gas, which can not only ensure the normal formation of the air curtain, but also prevent dust from entering the high-pressure air pump outlet pipe and extend the service life of the equipment. Equipped with a level sensor and multiple electric telescopic rods, the level sensor can monitor the level status of the support base in real time. In conjunction with the electric telescopic rods, it can move the shock-absorbing pads to quickly adjust the support base to a level state. The shock-absorbing pads can also absorb the vibration at the tunnel site, reduce the impact of vibration on calibration and positioning, and ensure the stability and accuracy of the calibration process. The laser receiver and position encoder are equipped with a protective shell. The protective shell is connected to the reference base through a fixing mechanism. The fixing pin is locked to the protective shell by the elastic force of the fixing spring. The protective shell can be quickly removed by pushing the guide block, which facilitates the maintenance and replacement of the internal core components. The optical grade sapphire glass transparent protective plate on the protective shell provides effective protection for the components without affecting the laser signal penetration. The surface nano coating can reduce dust adhesion. The rotation of the reference base is driven by a servo motor through gear transmission, which can precisely control the rotation angle of the reference base. With the sliding cooperation of the limit ball and the limit groove, the stability of the reference base rotation is ensured, further improving the calibration positioning accuracy. This multi-point positioning calibration device for the tunnel inner wall flatness laser profiler realizes multi-point distributed calibration of the laser profiler's full scanning range, improving calibration accuracy and efficiency. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the support base and fixing sleeve of the present invention; Figure 3 This is a schematic diagram of the drive motor and support sleeve of the present invention; Figure 4 This is a schematic diagram of the servo motor, connecting column, and reference base of the present invention; Figure 5 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the guide block and fixing pin of the present invention.
[0016] In the diagram: 1. Support base; 2. Electric telescopic rod; 3. Shock-absorbing pad; 4. Horizontal sensor; 5. Fixing sleeve; 6. Drive motor; 7. Guide screw; 8. Support sleeve; 9. Limiting slider; 10. Threaded column; 11. Protective shell; 12. Servo motor; 13. Drive gear; 14. Connecting column; 15. Driven gear; 16. Reference base; 17. Laser receiver; 18. Position encoder; 19. Protective shell; 20. Transparent protective plate; 21. Guide block; 22. Fixing pin; 23. Fixing ring; 24. Fixing spring; 25. Limiting ball; 26. Vent sleeve; 27. High-pressure air pump; 28. Dustproof plate. Detailed Implementation
[0017] Numerous specific details are set forth in the following description in order to provide a more thorough understanding of the invention; however, it will be apparent to those skilled in the art that this patent application may be practiced without one or more of these details; in other instances, certain technical features known in the art have not been described in order to avoid confusion with this patent application.
[0018] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this invention, and are explained here together.
[0019] like Figure 1 As shown, and in combination Figure 5A multi-point positioning calibration device for a laser profiler for tunnel wall flatness includes a support base 1 and a fixing sleeve 5 fixed to the surface of the support base 1. Multiple electric telescopic rods 2 are installed at equal intervals on the surface of the support base 1, and a shock-absorbing pad 3 is fixed to the output end of the electric telescopic rod 2. The bottom of the shock-absorbing pad 3 is provided with anti-slip patterns to ensure the stability of the support base 1 in the tunnel. At the same time, the shock-absorbing pad 3 can effectively absorb the vibration of the tunnel site, reduce the impact of vibration on the positioning of the device, and ensure the stability of the calibration process. The surface of the support base 1 has a groove, and a horizontal sensor 4 is installed in the groove. The horizontal sensor 4 can monitor the horizontal state of the support base 1 in real time. With the electric telescopic rods 2 driving the shock-absorbing pad 3 to move, the support base 1 can be quickly adjusted to a horizontal state to ensure the accuracy of subsequent calibration. Combination Figure 2 , Figure 3 A drive motor 6 is fixed to the bottom wall of the inner cavity of the fixed sleeve 5. Multiple heat dissipation holes (not shown in the figure) are opened at appropriate positions in the fixed sleeve 5. Dustproof nets are installed in the heat dissipation holes for heat dissipation of the drive motor 6. The output end of the drive motor 6 is fixed to the guide screw 7 through a coupling. The outer wall of the guide screw 7 is threadedly connected to the support sleeve 8, which is movably connected to the fixed sleeve 5. Limiting sliders 9 are fixed to both outer walls of the support sleeve 8. Limiting grooves for sliding of the limiting sliders 9 are opened on both inner walls of the fixed sleeve 5. The limiting sliders 9 slide in the limiting grooves on both inner walls of the fixed sleeve 5. When the drive motor 6 drives the guide screw 7 to rotate, the movement path and movement distance of the support sleeve 8 are limited, ensuring that the support sleeve 8 moves vertically in the fixed sleeve 5, while preventing the support sleeve 8 from separating from the guide screw 7. A threaded post 10 is fixed to the top of the support sleeve 8, and a protective shell 11 is threadedly connected to the outer wall of the threaded post 10. Combination Figure 4A servo motor 12 is installed on the bottom wall of the inner cavity of the protective shell 11. Multiple heat dissipation holes (not shown in the figure) are also provided at appropriate locations on the protective shell 11. Dust filters are installed inside the heat dissipation holes of the protective shell 11 for heat dissipation of the servo motor 12. A drive gear 13 is fixed to the output shaft of the servo motor 12. A limit plate can be installed on the top of the output shaft of the servo motor 12 according to actual usage requirements. The limit plate is rotatably connected to the output shaft of the servo motor 12 via a bearing, and one end of the limit plate is fixedly connected to the protective shell 11 to ensure the stability of the drive gear 13 during rotation. A connecting post 14 is rotatably connected inside the protective shell 11 via a bearing. The outer wall of the protective shell 11 is fixed with a driven gear 15 that meshes with the driving gear 13. The surface of the protective shell 11 is provided with a rotating groove. A reference seat 16 that is fixedly connected to the connecting column 14 is rotatably connected in the rotating groove. The angle of rotation of the reference seat 16 can be precisely controlled by the servo motor 12. The outer wall of the reference seat 16 is provided with multiple rolling grooves at equal intervals. Limiting balls 25 are fixedly connected in the rolling grooves. The inner wall of the protective shell 11 is provided with a limiting groove for the limiting balls 25 to roll. The limiting balls 25 roll in the limiting groove of the protective shell 11, which can ensure the stability of the rotation of the reference seat 16 in the protective shell 11 and further improve the accuracy of subsequent calibration. The surface of the reference base 16 is provided with multiple mounting slots at equal intervals. A laser receiver 17 and a position encoder 18 are respectively installed in the mounting slots. The laser receiver 17 has a built-in high-precision photoelectric sensor to receive the laser signal emitted by the laser profiler. The receiving accuracy is ≤0.001mm, which can accurately capture the position of the laser signal. The position encoder 18 is used to record the precise position coordinates of each laser receiver 17. The positioning accuracy is ≤0.005mm, which provides accurate reference position data for calibration. A protective shell 19 is inserted into the mounting slot. A through groove is provided on one side of the outer wall of the protective shell 19. A transparent protective plate 20 is installed in the through groove. A calibration hole is provided on the transparent protective plate 20. The transparent protective plate 20 can be made of optical grade sapphire glass and coated with a transparent nano-coating, which can reduce dust adhesion without affecting the penetration of the laser signal and protect the internal components from damage. The reference base 16 is equipped with multiple fixing mechanisms for fixing the protective shell 19, combined with Figure 6The fixing mechanism consists of a guide block 21 and a fixing pin 22. The surface of the reference base 16 is provided with a guide groove for the guide block 21 to move. The fixing pin 22 is fixed to one side of the guide block 21. The fixing pin 22 has a cuboid structure to prevent the fixing pin 22 from shaking in the reference base 16. One side of the outer wall of the protective shell 19 is provided with a fixing groove that matches the fixing pin 22. A fixing ring 23 is fixed to the outer wall of the fixing pin 22, and a fixing spring 24 for supporting the fixing ring 23 is sleeved on the outside of the fixing pin 22. The elastic force of the fixing spring 24 can be set according to the actual use requirements to ensure stable support for the fixing ring 23. By supporting the fixing ring 23 with the fixing spring 24, the fixing pin 22 is inserted into the fixing groove of the protective shell 19, which can fix the position of the protective shell 19. The guide block 21 drives the fixing pin 22 to move, so that the fixing pin 22 is separated from the protective shell 19, which can quickly remove the protective shell 19 from the reference base 16, making it convenient to maintain the components inside the protective shell 19. Combination Figure 5 The outer wall of the protective shell 11 is provided with an anti-interference mechanism, which consists of a venting sleeve 26 and multiple high-pressure air pumps 27. The venting sleeve 26 is fixed to the outside of the protective shell 11, and the high-pressure air pumps 27 are installed at the bottom of the venting sleeve 26. The multiple high-pressure air pumps 27 correspond to the positions of the protective shell 19. Multiple positioning grooves are evenly spaced on the surface of the venting sleeve 26. Two dustproof plates 28 are rotatably connected in the positioning grooves via a rotating shaft. The air outlet pipe of the high-pressure air pump 27 extends into the venting sleeve 26 and fits against the bottom of the dustproof plate 28. A torque spring is installed on the outside of the rotating shaft. The elastic force of the torque spring can be set according to the actual use requirements. When the high-pressure air pump 27 is working, it can make the two dustproof plates 28 rotate and unfold along the position of the rotating shaft. When the high-pressure air pump 27 stops working, the two dustproof plates 28 close under the action of the torque spring, preventing dust from entering the air outlet pipe of the high-pressure air pump 27. The high-pressure air pump 27 sprays high-pressure gas to form an annular air curtain, which effectively isolates the dust in the tunnel and prevents the dust from adhering to the receiving end of the laser receiver 17 and affecting the signal receiving accuracy. The device can also be configured with a controller, data acquisition module, deviation analysis module, and command output module (not shown in the figure) according to usage requirements. The controller adopts a PLC controller with a response speed of ≤10ms to ensure the real-time nature of the calibration process. The data acquisition module is used to collect laser positioning data of the laser profiler, reference position data of laser receiver 17 and position encoder 18, with an acquisition frequency of 100Hz to ensure the timeliness and accuracy of data acquisition. The deviation analysis module is used to compare the laser positioning data with the reference position data and calculate the positioning deviation of the laser profiler at each calibration reference point. The deviation calculation accuracy is ≤0.001mm, which can accurately identify the positioning offset of the laser profiler. The command output module is used to send position and angle adjustment commands to the drive components on the device according to the deviation data, and at the same time send calibration correction commands to the laser profiler to achieve real-time calibration and ensure the positioning accuracy of the laser profiler. The device can also be equipped with a data storage device (not shown in the figure). The data storage device is used to store the reference position data, laser profiler positioning data, deviation data and calibration results during the calibration process. The storage capacity is 32GB and supports long-term data storage with a retention time of ≥1 year. The data storage device is equipped with a touch screen to display real-time data, deviation data and calibration results during the calibration process, which is convenient for staff to observe and operate in real time. The device can be powered by a lithium battery or mains power.
[0020] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The control method of this invention is through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. It should be noted that the electrical components mentioned in this invention have been sorted according to the actual situation during manufacturing, so as not to cause the wire harness to become tangled or affect the operation. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.
[0021] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0022] Working principle: When using the multi-point positioning calibration device of the tunnel inner wall flatness laser profiler, the device is first placed in the calibration operation position inside the tunnel. The horizontal sensor 4 on the surface of the support base 1 monitors the horizontal status of the device in real time. The controller controls the extension and retraction of multiple electric telescopic rods 2 according to the detection data of the horizontal sensor 4, which drives the shock-absorbing pad 3 to contact the ground and adjust the support base 1 to a horizontal state. The shock-absorbing pad 3 absorbs the vibration on site at the same time, ensuring the overall stability of the device. Then, drive motor 6 is started, which drives guide screw 7 to rotate. Under the limiting action of limit slider 9 and limit groove, support sleeve 8 moves vertically along fixed sleeve 5, driving protective shell 11 and reference base 16 to adjust to the calibration height matching the laser profiler. After adjustment, drive motor 6 is turned off and servo motor 12 is started. Servo motor 12 drives drive gear 13 to rotate. Drive gear 13 meshes with driven gear 15, driving connecting column 14 and reference base 16 to rotate in the rotation groove of protective shell 11. Limit ball 25 rolls in the limit groove to ensure the stability of reference base 16 rotation. Servo motor 12 precisely controls the rotation angle of reference base 16, so that multiple sets of laser receivers 17 and position encoders 18 are distributed in the full scanning range of laser profiler, each set corresponding to a calibration reference point, forming multiple calibration reference points. The high-pressure air pump 27 of the anti-interference mechanism is activated. The high-pressure air pump 27 delivers high-pressure gas into the ventilation sleeve 26. The high-pressure gas pushes the dustproof plate 28 to rotate around the shaft and unfold. The high-pressure gas is sprayed out from the ventilation sleeve 26 to form an annular air curtain, which isolates the dust in the tunnel and prevents the dust from adhering to the receiving end of the laser receiver 17. After calibration, the high-pressure air pump 27 is turned off. The dustproof plate 28 closes under the elastic force of the torque spring to prevent dust from entering the ventilation sleeve 26 and the air outlet pipe of the high-pressure air pump 27. The laser profiler emits a detection laser, and the laser receiver 17 on the reference base 16 receives the laser signal. The position encoder 18 synchronously records the precise position coordinates of each laser receiver 17 and transmits them to the data acquisition module. The data acquisition module simultaneously acquires the laser positioning data of the laser profiler and transmits both types of data to the deviation analysis module. The deviation analysis module compares the two types of data and accurately calculates the positioning deviation of the laser profiler at each calibration reference point. Based on the calculation results of the deviation analysis module, the controller sends a calibration correction command to the laser profiler through the command output module. At the same time, the angle of the reference base 16 and the calibration height of the device can be adjusted as needed to achieve multi-point distributed real-time automatic calibration of the laser profiler's full scanning range. All data during the calibration process is stored in the data storage device. The operator can observe the calibration data, deviation status, and calibration results in real time through the touch screen. The stored data can also be traced and viewed later.
[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A multi-point positioning and calibration device for a laser profiler for tunnel wall flatness, characterized in that: It includes a support base and a fixed sleeve fixed to the surface of the support base. The fixed sleeve is provided with a support sleeve movably connected thereto. The fixed sleeve has a drive motor for driving the support sleeve to rise and fall, so as to adjust the protective shell and the reference base to a calibration height that matches the laser profiler. The top of the support sleeve is fixed with a threaded post; the threaded post is threadedly connected to a protective shell; the surface of the protective shell has a rotating groove, and a reference seat is rotatably connected in the rotating groove; the top surface of the reference seat has multiple mounting grooves at equal intervals, and a laser receiver and a position encoder are respectively installed in each mounting groove, and a protective shell for protecting the laser receiver and the position encoder is inserted into the mounting groove; the reference seat is connected to a connecting post, and the connecting post is rotatably connected inside the protective shell; a driven gear that meshes with a driving gear is fixed to the outer wall of the connecting post; the driving gear is connected to the output end of a servo motor; the servo motor is installed on the bottom wall of the inner cavity of the protective shell; the servo motor precisely controls the rotation angle of the reference seat, so that multiple sets of laser receivers and position encoders are distributed within the full scanning range of the laser profiler, each set corresponding to a calibration reference point, forming multiple calibration reference points; The outer wall of the protective shell is equipped with an anti-interference mechanism. The anti-interference mechanism consists of a venting sleeve and multiple high-pressure air pumps. The venting sleeve is placed outside the protective shell, and the multiple high-pressure air pumps are respectively positioned opposite to the protective shell. The surface of the venting sleeve is provided with multiple positioning grooves at equal intervals. Two dustproof plates are rotatably connected in the positioning grooves through a rotating shaft. The multiple high-pressure air pumps spray high-pressure gas to form an annular air curtain, which can effectively isolate dust in the tunnel. The dustproof plates are automatically opened and closed under the cooperation of torque springs and high-pressure gas.
2. The multi-point positioning and calibration device for a laser profiler for tunnel wall smoothness according to claim 1, characterized in that: Each of the aforementioned protective shells is provided with a fixing mechanism, which consists of a guide block and a fixing pin. The surface of the reference base is provided with a guide groove for the guide block to move. The fixing pin is fixed to one side of the guide block. One side of the outer wall of the protective shell is provided with a fixing groove that matches the fixing pin.
3. The multi-point positioning and calibration device for a laser profiler for tunnel wall smoothness according to claim 2, characterized in that: A fixing ring is fixed to the outer wall of the fixing pin, and a fixing spring for supporting the fixing ring is sleeved on the outside of the fixing pin.
4. The multi-point positioning and calibration device for a laser profiler for tunnel wall smoothness according to claim 1, characterized in that: A guide screw is fixed to the output end of the drive motor, and the guide screw is threadedly connected to the fixed sleeve.
5. The multi-point positioning and calibration device for a laser profiler for tunnel wall smoothness according to claim 1, characterized in that: Multiple electric telescopic rods are installed at equal intervals on the outer wall of the support base, and shock-absorbing pads are fixed to the output ends of the electric telescopic rods. The surface of the support base has grooves, and a level sensor is installed in the grooves. The level sensor monitors the horizontal state of the device in real time. The controller controls the extension and retraction of the multiple electric telescopic rods according to the detection data of the level sensor, which drives the shock-absorbing pads to contact the ground and adjust the support base to a horizontal state. The shock-absorbing pads absorb the vibration on site at the same time, ensuring the overall stability of the device.
6. The multi-point positioning and calibration device for a laser profiler for tunnel wall smoothness according to claim 1, characterized in that: The outer walls of both sides of the support sleeve are fixed with limit sliders, and the inner walls of both sides of the fixed sleeve are provided with limit grooves for the limit sliders to slide.
7. The multi-point positioning and calibration device for a laser profiler for tunnel wall smoothness according to claim 1, characterized in that: A through groove is provided on one side of the outer wall of the protective shell, and a transparent protective plate is installed in the through groove. A calibration hole is provided on the transparent protective plate.
8. The multi-point positioning and calibration device for a laser profiler for tunnel wall smoothness according to claim 1, characterized in that: The outer wall of the reference base is provided with multiple rolling grooves at equal intervals, and a limiting ball is fixedly connected in the rolling groove. The inner wall of the protective shell is provided with a limiting groove for the limiting ball to roll.
9. The multi-point positioning and calibration device for a laser profiler for tunnel wall smoothness according to claim 1, characterized in that: The outlet pipe of the high-pressure air pump extends into the ventilation sleeve and fits against the bottom of the dustproof plate. A torque spring is installed on the outside of the rotating shaft on the dustproof plate.