Laser surveying and mapping demarcation device

Abstract

The invention relates to the technical field of laser surveying and mapping, and particularly discloses a laser surveying and mapping demarcation device which comprises a shell and a transparent glass cover on the side wall of the shell, a laser module used for emitting laser is arranged in the shell, and a focusing lens is arranged between a light source generator in the laser module and the transparent glass cover. According to the invention, through mechanical linkage of the pendulum bob assembly and the adjusting assembly, the laser module can be automatically maintained to be vertical on any inclined base and optical focal length compensation can be synchronously completed, so that errors caused by response delay or calibration deviation of an electronic sensor can be avoided; the reliability in severe environments such as vibration, high and low temperature or electromagnetic interference is also obviously improved; a pure mechanical self-adaptive focusing mechanism can keep stable work for a long time without an external power supply, and the applicability of equipment in passive scenes such as field survey, underground construction or emergency rescue is greatly expanded.

Description

Technical Field

[0001] This invention relates to the field of laser mapping technology, specifically to a laser mapping projection instrument. Background Technology

[0002] A laser line projector, also known as a laser line projector or laser line marker, is a surveying instrument that uses a laser beam to form a visible baseline or reference point on a wall, ground, or ceiling. It is mainly used for measurement and positioning in scenarios such as building construction, interior decoration, and equipment installation. Its working principle is to emit a visible beam of light through a laser diode, which is then expanded into a fan-shaped laser surface by optical elements such as a prism light guide system or a conical reflector, thereby projecting horizontal lines, vertical lines, or cross lines onto the target surface. Therefore, it usually uses a built-in gravity pendulum or electronic compensator to keep the laser line horizontal or vertical.

[0003] However, in existing technologies, the tilt angle is detected by electronic sensors, and then the laser module is driven by a micro motor for compensation and leveling. Because the electronic system requires time for detection, calculation, and driving, instantaneous leveling cannot be achieved. Furthermore, in the presence of slight vibrations or wind, the sensor data is prone to fluctuations, causing the laser line to continuously tremble slightly, affecting the reading. In contrast, the pendulum system will swing (oscillate) for a long time after being disturbed by external forces (such as collisions during placement or wind), and it takes a long time to come to a stop. Moreover, the laser module is fixed at different angles of the pendulum. The projected laser line is clear at close range, but as the distance increases, the laser line will spread and thicken, and the brightness will decrease. When measuring at long distances, the lines will become blurred, resulting in a serious decrease in accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a laser mapping line projection instrument to solve at least one technical problem existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a laser mapping line projection device, comprising a housing and a transparent glass cover on the side wall of the housing, wherein a laser module for emitting laser is provided inside the housing, and a focusing lens is provided between the light source generator inside the laser module and the transparent glass cover; It also includes a beam projection module, which is used to convert a single laser beam into a cross beam. It also includes a pendulum assembly, which provides a vertical reference to the laser module; It also includes an adjustment component that can adjust the focusing point of the focusing lens along the optical axis according to the angular displacement of the laser module relative to the housing along the optical axis.

[0006] Preferably, the projection module includes an end cover fixedly installed on the side wall of the laser module, the end cover is provided with a horizontal lens and a vertical lens, a sliding cover that can be slidably adjusted is installed on the inner wall of the laser module between the light source generator and the end cover, and the focusing lens is fixedly installed in the sliding cover.

[0007] Preferably, the pendulum assembly includes a connecting shaft seat fixedly installed on the top surface of the housing, a rotating shaft rotatably installed in the connecting shaft seat, a vertical shaft fixedly installed in a through hole at the center of the rotating shaft, a rotating frame rotatably installed on the outer wall of the vertical shaft, a counterweight box fixedly connected to the bottom end of the rotating frame, and the laser module fixedly installed on the side end of the counterweight box.

[0008] Preferably, the adjustment assembly includes a rotating lead screw rotatably installed in the counterweight box, the sliding cover sidewall has a hole through which the rotating lead screw can pass and the hole has a threaded groove that can mesh with the lead screw on the outer wall of the rotating lead screw, and a rotatable turbine is fixedly installed at one end of the rotating lead screw that protrudes from the counterweight box.

[0009] Preferably, a connector is fixedly installed on the outer wall of the rotating shaft, and rotating plates are rotatably installed at both ends of the rotating shaft. The side walls of the two sets of rotating plates are respectively fixedly connected to the two ends of the connector. A fixed shaft is rotatably installed between the two sets of rotating plates. The outer wall of the fixed shaft is provided with a vortex groove that can mesh with the turbine. A rotating gear is fixedly installed on the outer wall of the fixed shaft. A fixed rack that can mesh with the rotating gear is fixedly installed on the side wall of the counterweight box. The fixed rack is arc-shaped, and its center coincides with the center of the vertical axis.

[0010] Preferably, magnetic plates are fixedly installed on the outer walls of the rotating shafts on both sides of the connecting shaft seat, a magnet is fixedly installed on the top of the rotating frame, and damping discs are provided on both sides of the magnetic plates and magnets along their rotation direction. It also includes a drive assembly for driving the damping discs on both sides of the magnetic plate and the magnet to move closer or further apart.

[0011] Preferably, the drive assembly includes two sets of fixed frames that can move closer or further apart from each other. Sliding blocks are fixedly installed at both ends of the two sets of fixed frames. Sliding blocks are provided on both sides of the magnet and the magnetic plate. The damping disc is distributed on the outer wall of the sliding blocks on both sides of the magnet and the magnetic plate along their rotation direction. The sliding blocks on both sides of the magnet are slidably installed on the outer wall of the vertical axis through sliding frames. A rotating rod is rotatably connected between every two adjacent sliding blocks, and multiple rotating rods and sliding blocks can form three sequentially connected rhombuses.

[0012] Preferably, angle sensors are provided at both ends of the rotating shaft and the vertical shaft, and the angle sensors are connected to the fixing frame by electrical signals.

[0013] Preferably, the rotating gear is a non-circular gear, and the curvature of the fixed rack can always remain in contact with the outer tooth line of the rotating gear.

[0014] Preferably, the counterweight box has a counterweight groove at its bottom.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: I. This invention achieves automatic verticality of the laser module and synchronous optical focal length compensation on any tilted base through the mechanical linkage of the pendulum assembly and adjustment assembly. This not only avoids errors caused by electronic sensor response delay or calibration deviation, but also significantly improves reliability in harsh environments such as vibration, high and low temperatures, or electromagnetic interference. Its purely mechanical adaptive focusing mechanism can maintain stable operation for a long time without external power supply, greatly expanding the applicability of the equipment in passive scenarios such as field surveying, underground construction, or emergency rescue, while reducing maintenance complexity and long-term operating costs. Furthermore, it ensures that the projected crosshair laser line remains clear and sharp at any angle and distance, effectively improving surveying accuracy and work efficiency.

[0016] Second, this invention uses the precise meshing of a non-circular gear and an arc-shaped fixed rack to convert the angular deflection of the pendulum into a non-linear mechanical motion, which is then further precisely decelerated and converted by a worm gear mechanism, achieving highly adaptive adjustment between the deflection angle and the lens displacement. This not only effectively amplifies the lens fine-tuning requirements caused by minute angle changes, ensuring rapid and accurate focusing compensation when tilting at large angles, but also utilizes the reliability and anti-interference of a purely mechanical structure to avoid errors, delays, or damage that may occur in electronic sensors under frequent deflection or vibration scenarios.

[0017] Third, this invention combines a non-contact magnetic eddy current damping mechanism with an adjustable damping disc, enabling intelligent adjustment of the damping force based on the tilt angle: reducing damping at small angles to improve response sensitivity and fine-tuning efficiency, and increasing damping at large angles to quickly suppress swaying, resist disturbances, and shorten stabilization time. This not only avoids wear and accuracy loss caused by mechanical contact and achieves long-term maintenance-free high reliability, but also significantly enhances the balance stability and vibration resistance of the line projector under complex external interferences such as vibration and wind, ensuring rapid leveling and accurate mapping. At the same time, it does not rely on external power throughout the process, making it particularly suitable for long-term field, high-altitude, and harsh environment operations, further expanding the application range and service life of the equipment. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a side cross-sectional view of the present invention; Figure 3 In this invention Figure 2Isometric cross-section; Figure 4 This is a three-dimensional structural diagram of the pendulum assembly in this invention. Figure 1 ; Figure 5 This is a three-dimensional structural diagram of the pendulum assembly in this invention. Figure 2 ; Figure 6 This is a three-dimensional structural diagram of the driving component in this invention; Figure 7 This is a planar schematic diagram of the drive component during adjustment according to the present invention; Figure 8 For the present invention Figure 3 A magnified view of a portion of point A in the middle.

[0019] In the diagram: 1. Outer shell; 2. Connecting shaft seat; 3. Rotating shaft; 4. Vertical shaft; 5. Rotating frame; 6. Counterweight box; 7. Laser module; 8. End cap; 9. Sliding cover; 10. Focusing lens; 11. Horizontal lens; 12. Vertical lens; 13. Rotating screw; 14. Magnet; 15. Rotating plate; 16. Rotating gear; 17. Fixed rack; 18. Connector; 19. Fixed shaft; 20. Turbine; 21. Magnetic plate; 22. Fixed frame; 23. Sliding block; 24. Rotating rod; 25. Damping disc; 26. Sliding frame. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 8 The present invention provides a technical solution: a laser mapping line projection instrument, including a housing 1 and a transparent glass cover on the side wall of the housing 1, a laser module 7 for emitting laser is provided inside the housing 1, and a focusing lens 10 is provided between the light source generator inside the laser module 7 and the transparent glass cover; It also includes a beam projection module, which is used to convert a single laser beam into a cross beam. It also includes a pendulum assembly, which is used to provide a vertical reference for the laser module 7; It also includes an adjustment component that can adjust the focusing point of the focusing lens 10 along the optical axis according to the angular displacement of the laser module 7 relative to the housing 1 along the optical axis.

[0022] In the prior art, when the laser projector is placed on a perfectly horizontal surface, the emitted beam is vertical. The ideal projection surface at this time is the vertical plane directly in front of the projector. After the lens position is calibrated, the laser line is clearest on the vertical wall at a distance D, which is the designed standard projection distance. When the projector is placed on a surface with an inclination angle of θ, the laser module can maintain its verticality due to the gravity compensation of the pendulum. However, the ideal projection surface of the laser beam becomes an inclined plane at an angle θ with the device base. This makes the optical path from the laser to any point on this inclined plane longer than the optical path to the original vertical wall directly in front. Due to the increase in projection distance, the original focal point will fall behind this inclined plane, causing the laser line to become blurred on this inclined plane. Therefore, in order to make the focal point fall on this new inclined plane again, the focusing lens 10 turbine must be moved a certain distance along the optical axis to increase the divergence of the laser beam and push the focal point further away.

[0023] When using this device, first place the laser mapping projector at the selected measurement location. Then, fix the outer casing 1 to the ground using an external fixing device (such as a ground lock, tripod, etc.). At this time, the pendulum assembly, under the influence of its own gravity, keeps the laser module 7 perpendicular to the horizon. When the laser beam emitted by the laser emitter passes through the projection module, the projection module can convert the single laser beam into a crosshair projection onto the preset projection surface. Mapping of the external environment can then begin based on laser readings. Because the laser module 7 can maintain its verticality under the gravity compensation of the pendulum, the ideal projection surface of the laser beam becomes an inclined plane at an angle θ to the device base, causing the laser to... The optical path at any point on the surface is longer than the optical path to the original vertical wall directly in front. At this time, the external drive structure drives the adjustment component to adjust the focusing lens 10 along the optical axis according to the angular displacement of the laser module 7 relative to the outer shell 1. This makes the focus fall on the new inclined surface, ensuring that the projected laser line is always in the best focused state under different tilt angles (i.e. different usage postures) and different distances, keeping it the thinnest and brightest. This not only alleviates the problem of long-distance diffusion of the laser line, but also makes the focusing function no longer dependent on any electronic sensors, chips or motors. The structure is robust, has strong anti-interference ability, and can greatly reduce the energy consumption of the device to adapt to situations without power supply or long-term field operations.

[0024] In this way, through the mechanical linkage between the pendulum assembly and the adjustment assembly, the line projector can automatically maintain the verticality of the laser module 7 on any tilted base and simultaneously complete optical focal length compensation. This not only avoids errors caused by electronic sensor response delay or calibration deviation, but also significantly improves reliability in harsh environments such as vibration, high and low temperatures, or electromagnetic interference. Its purely mechanical adaptive focusing mechanism can maintain stable operation for a long time without external power supply, greatly expanding the applicability of the equipment in passive scenarios such as field surveying, underground construction, or emergency rescue, while reducing maintenance complexity and long-term operating costs. Ultimately, the projected crosshair laser line remains clear and sharp at any angle and distance, effectively improving surveying accuracy and work efficiency.

[0025] Furthermore, the projection module includes an end cover 8 fixedly installed on the side wall of the laser module 7. A horizontal lens 11 and a vertical lens 12 are provided inside the end cover 8. A sliding cover 9 that can be slidably adjusted is installed on the inner wall of the laser module 7 between the light source generator and the end cover 8. A focusing lens 10 is fixedly installed inside the sliding cover 9.

[0026] The above embodiments provide a specific implementation of a projection module; see details below. Figure 8 When the laser generator emits a single laser beam, it can be focused by the focusing lens 10 so that the light can be projected onto the preset projection surface in a clear and sharp state. The focused light beam is then split into two groups of mutually perpendicular light beams by the horizontal lens 11 and the vertical lens 12, and projected onto the projection surface in a cross shape. The external environment can then be mapped based on the projected cross rays as a planar coordinate system.

[0027] Furthermore, the pendulum assembly includes a connecting shaft seat 2 fixedly installed on the top surface inside the housing 1, a rotating shaft 3 rotatably installed inside the connecting shaft seat 2, a vertical shaft 4 fixedly installed in the through hole opened in the center of the rotating shaft 3, a rotating frame 5 rotatably installed on the outer wall of the vertical shaft 4, a counterweight box 6 fixedly connected to the bottom end of the rotating frame 5, and a laser module 7 fixedly installed on the side end of the counterweight box 6.

[0028] Furthermore, the bottom of the counterweight box 6 is provided with a counterweight groove.

[0029] A specific implementation of a pendulum assembly is provided based on the above embodiments. See details below. Figure 4 When the ground on which the outer shell 1 is located is uneven, the counterweight box 6 rotates relative to the outer shell 1 under the action of gravity. When the gravity on the counterweight box 6 shifts to the line where the rotation axis 3 is located, the counterweight box 6 will rotate around the vertical axis 4 as the center. When the gravity on the counterweight box 6 shifts to the line where the vertical axis 4 is located, the rotation axis 3 is affected by gravity and drives the vertical axis 4 to rotate along its axis. This allows the laser module 7 to automatically maintain a vertical state on any tilted base, ensuring that the laser can be emitted in a vertical or parallel state.

[0030] Furthermore, the adjustment assembly includes a rotating lead screw 13 rotatably installed inside the counterweight box 6, and the side wall of the sliding cover 9 is provided with a hole through which the rotating lead screw 13 can pass, and the hole is provided with a threaded groove that can mesh with the lead screw on the outer wall of the rotating lead screw 13. A rotatable and adjustable turbine 20 is fixedly installed at one end of the rotating lead screw 13 that protrudes from the counterweight box 6.

[0031] A specific implementation of the adjustment component is provided based on the above embodiments, see details below. Figure 3 and Figure 8 When the external drive detects that the laser module 7 has an angular displacement relative to the outer shell 1 along the optical axis (when the gravity of the counterweight box 6 shifts to the line where the vertical axis 4 is located, the laser optical path does not change, so in this case, only the situation where the gravity of the counterweight box 6 shifts to the line where the rotation axis 3 is located is adjusted), that is, the counterweight box 6 and the rotating frame 5 rotate together with the vertical axis 4 as the center. At this time, the external drive structure drives the turbine 20 to rotate and drives the rotating screw 13 to rotate together. Through the threaded structure between the rotating screw 13 and the sliding cover 9, the sliding cover 9 is driven to slide horizontally along the inner wall of the laser module 7, thereby changing the distance between the sliding cover 9 and the laser generator and the focal point of the laser, so as to ensure that the projected cross laser line remains clear and sharp at any angle and distance.

[0032] Furthermore, a connector 18 is fixedly installed on the outer wall of the rotating shaft 3, and rotating plates 15 are rotatably installed at both ends of the rotating shaft 3. The side walls of the two sets of rotating plates 15 are fixedly connected to the two ends of the connector 18, and a fixed shaft 19 is rotatably installed between the two sets of rotating plates 15. The outer wall of the fixed shaft 19 is provided with a vortex groove that can mesh with the turbine 20. A rotating gear 16 is fixedly installed on the outer wall of the fixed shaft 19. A fixed rack 17 that can mesh with the rotating gear 16 is fixedly installed on the side wall of the counterweight box 6. The fixed rack 17 is arc-shaped, and its center coincides with the center of the vertical axis 4.

[0033] Furthermore, the rotating gear 16 is a non-circular gear, and the curvature of the fixed rack 17 can always maintain contact with the outer tooth line of the rotating gear 16.

[0034] The above-described embodiment provides a specific implementation method for adjusting the rotation of the turbine 20. See details below. Figure 4 and Figure 5When the counterweight box 6 and the rotating frame 5 rotate together around the vertical axis 4, they will drive the fixed rack 17 to rotate as well. While the fixed rack 17 is rotating, it will drive the rotating gear 16 meshing with it to rotate as well. And through the fixed shaft 19, it will drive the turbine 20 to rotate. At this point, when a relative rotation angle is generated between the pendulum and the outer shell 1, this angle can be decelerated and transmitted to the turbine 20 through the cooperation between the lead screw, rack and turbine 20. The turbine 20 will then convert the displacement of the sliding cover 9 and the focusing lens 10 into a precise displacement. Since the rotating gear 16 is a non-circular gear, its transmission ratio can change according to the relationship between the angle change of the laser module 7 and the required displacement of the focusing lens 10 (this relationship is non-linear. When the angle change is small, the displacement changes slowly, while when the angle change increases, the displacement increases sharply), so that the laser can always maintain a clear and sharp line projected onto the projection surface.

[0035] In this way, through the precise meshing of the non-circular gear and the arc-shaped fixed rack 17, the angular deflection of the pendulum is converted into a non-linear mechanical motion, which is then further precisely decelerated and converted by the worm gear mechanism of the turbine 20, achieving highly adaptive adjustment between the deflection angle and the lens displacement. This not only effectively amplifies the lens fine-tuning requirements caused by small angle changes, ensuring rapid and accurate focusing compensation when tilted at large angles, but also utilizes the reliability and anti-interference of the purely mechanical structure to avoid errors, delays, or damage that may occur in electronic sensors under frequent deflection or vibration scenarios. The entire mechanism can complete real-time, continuous, and stable automatic focusing without external power supply, significantly improving the environmental adaptability and long-term measurement consistency of the line projector under complex working conditions, while reducing the system's maintenance complexity and energy consumption costs.

[0036] Furthermore, magnetic plates 21 are fixedly installed on the outer walls of the rotating shafts 3 located on both sides of the connecting shaft seat 2, and magnets 14 are fixedly installed on the top of the rotating frame 5. Damping discs 25 are provided on both sides of the magnetic plates 21 and magnets 14 along their rotation direction. It also includes a drive assembly for driving the damping discs 25 on both sides of the magnetic plate 21 and the magnet 14 to move closer or further apart.

[0037] As can be seen from the above embodiments, when the counterweight box 6 and the rotating frame 5 rotate together around the vertical axis 4, or when the rotating shaft 3 rotates around the connecting shaft seat 2, the magnetic plate 21 and the magnet 14 will cut the magnetic field lines in the damping disk 25 (the damping disk 25 is a non-metallic highly conductive material, such as a copper disk), generating eddy currents. The magnetic field generated by the eddy currents interacts with the original magnetic field, generating a completely non-contact damping force. This force is always opposite to the direction of the pendulum's movement, thereby suppressing the swing extremely quickly and restoring it to a static equilibrium state. When the drive component detects that the tilt angle of the laser module 7 is small, the drive component drives the damping disks 25 to move away from each other, reducing the damping force on the magnetic plate 21 and the magnet 14 when they rotate, so that the system sensitivity reaches its maximum and can be quickly fine-tuned to balance. When the drive component detects that the tilt angle of the laser module 7 is large, the drive component drives the damping disks 25 to move closer to each other, increasing the damping force, thereby rapidly suppressing the swing and improving the pendulum's anti-interference ability under large tilt angles to cope with complex working conditions.

[0038] In this way, by combining the non-contact magnetic eddy current damping mechanism with the adjustable damping disk 25, the damping force can be intelligently adjusted according to the tilt angle: the damping is reduced when the angle deflection is small to improve the response sensitivity and fine-tuning efficiency, while the damping is increased when the angle deflection is large to quickly suppress swaying, resist disturbances and shorten the stabilization time. This not only avoids the wear and accuracy loss caused by mechanical contact and achieves long-term maintenance-free high reliability, but also significantly enhances the balance stability and vibration resistance of the line projector under complex external interferences such as vibration and wind, ensuring rapid leveling and accurate mapping. At the same time, it does not rely on external power throughout the process, making it especially suitable for long-term field, high-altitude and harsh environment operations, further expanding the application range and service life of the equipment.

[0039] Furthermore, the drive assembly includes two sets of fixed frames 22 that can move closer or further apart from each other. Sliding blocks 23 are fixedly installed at both ends of the two sets of fixed frames 22. Sliding blocks 23 are provided on both sides of the magnet 14 and the magnetic plate 21. Damping discs 25 are distributed on the outer walls of the sliding blocks 23 on both sides of the magnet 14 and the magnetic plate 21 along their rotation direction. The sliding blocks 23 on both sides of the magnet 14 are slidably installed on the outer wall of the vertical axis 4 through sliding frames 26. A rotating rod 24 is rotatably connected between every two adjacent sliding blocks 23, and multiple rotating rods 24 and sliding blocks 23 can form three sequentially connected rhombuses.

[0040] Furthermore, angle sensors are provided at both ends of the rotating shaft 3 and the vertical shaft 4, and the angle sensors are connected to the fixing frame 22 by electrical signals.

[0041] A specific implementation of the adjustment component is provided based on the above embodiments, see details below. Figure 6When the angle sensor (e.g., an absolute encoder or potentiometer) detects a large rotational speed of the rotating shaft 3 and the vertical shaft 4, it can drive the two sets of fixed brackets 22 away from each other through an external drive structure (e.g., a cylinder), pulling the two sets of opposing sliding blocks 23 away from each other. See details... Figure 7 At this time, the sliding blocks 23 on both sides move away from each other, so that the sliding blocks 23 in the middle move closer to each other under the action of the rotating rod 24. That is, the sliding blocks 23 on both sides of the magnetic plate 21 and the damping disk 25 move closer to each other, which increases the damping force when the rotating shaft 3 rotates. At the same time, the sliding blocks 23 on both sides of the magnet 14 and the damping disk 25 also move closer to each other, increasing the damping force when the rotating frame 5 rotates with the vertical axis 4 as the center. When the fixed frame 22 moves closer to each other, the damping force when the rotating shaft 3 and the rotating frame 5 rotate simultaneously decreases, thus realizing the above-mentioned intelligent adjustment of the damping force according to the tilt angle.

[0042] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed directly based on existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0043] 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 laser mapping line projector, comprising a housing (1) and a transparent glass cover on the side wall of the housing (1), characterized in that: The outer casing (1) is provided with a laser module (7) for emitting lasers, and a focusing lens (10) is provided between the light source generator and the transparent glass cover in the laser module (7). It also includes a beam projection module, which is used to convert a single laser beam into a cross beam. It also includes a pendulum assembly, which is used to provide a vertical reference to the laser module (7); It also includes an adjustment component that can adjust the focal point of the focusing lens (10) along the optical axis according to the angular displacement of the laser module (7) relative to the housing (1) along the optical axis.

2. The laser mapping line projection instrument according to claim 1, characterized in that: The projection module includes an end cap (8) fixedly installed on the side wall of the laser module (7). The end cap (8) is provided with a horizontal lens (11) and a vertical lens (12). A sliding cover (9) that can be slidably adjusted is installed on the inner wall of the laser module (7) between the light source generator and the end cap (8). The focusing lens (10) is fixedly installed in the sliding cover (9).

3. The laser mapping line projection instrument according to claim 2, characterized in that: The pendulum assembly includes a connecting shaft seat (2) fixedly installed on the top surface inside the outer shell (1), a rotating shaft (3) rotatably installed inside the connecting shaft seat (2), a vertical shaft (4) fixedly installed in the through hole in the center of the rotating shaft (3), a rotating frame (5) rotatably installed on the outer wall of the vertical shaft (4), a counterweight box (6) fixedly connected to the bottom end of the rotating frame (5), and a laser module (7) fixedly installed on the side end of the counterweight box (6).

4. The laser mapping line projection instrument according to claim 3, characterized in that: The adjustment assembly includes a rotating screw (13) rotatably installed in the counterweight box (6). The side wall of the sliding cover (9) is provided with a hole through which the rotating screw (13) can pass, and the hole is provided with a threaded groove that can mesh with the screw on the outer wall of the rotating screw (13). One end of the rotating screw (13) that protrudes from the counterweight box (6) is fixedly installed with a rotatable turbine (20).

5. The laser mapping line projection instrument according to claim 4, characterized in that: A connector (18) is fixedly installed on the outer wall of the rotating shaft (3). A rotating plate (15) is rotatably installed at both ends of the rotating shaft (3). The side walls of the two sets of rotating plates (15) are fixedly connected to the two ends of the connector (18). A fixed shaft (19) is rotatably installed between the two sets of rotating plates (15). The outer wall of the fixed shaft (19) is provided with a vortex groove that can mesh with the turbine (20). A rotating gear (16) is fixedly installed on the outer wall of the fixed shaft (19). A fixed rack (17) that can mesh with the rotating gear (16) is fixedly installed on the side wall of the counterweight box (6). The fixed rack (17) is arc-shaped, and its center coincides with the center of the vertical axis (4).

6. The laser mapping line projection instrument according to claim 3, characterized in that: A magnetic plate (21) is fixedly installed on the outer wall of the rotating shaft (3) located on both sides of the connecting shaft seat (2), and a magnet (14) is fixedly installed on the top of the rotating frame (5). The magnetic plate (21) and the magnet (14) are provided with damping discs (25) on both sides along their rotation direction. It also includes a drive assembly for driving the damping discs (25) on both sides of the magnetic plate (21) and the magnet (14) to move closer or further apart.

7. The laser mapping line projection instrument according to claim 6, characterized in that: The drive assembly includes two sets of fixed frames (22) that can move closer or further apart from each other. Sliding blocks (23) are fixedly installed at both ends of the two sets of fixed frames (22). Sliding blocks (23) are provided on both sides of the magnet (14) and the magnetic plate (21). The damping disk (25) is distributed on the outer wall of the sliding blocks (23) on both sides of the magnet (14) and the magnetic plate (21) along their rotation direction. The sliding blocks (23) on both sides of the magnet (14) are slidably installed on the outer wall of the vertical axis (4) through the sliding frame (26). A rotating rod (24) is rotatably connected between each two adjacent sliding blocks (23), and multiple rotating rods (24) and sliding blocks (23) can form three rhombuses connected in sequence.

8. The laser mapping line projection instrument according to claim 7, characterized in that: Angle sensors are provided at both ends of the rotating shaft (3) and the vertical shaft (4), and the angle sensors are connected to the fixing frame (22) by electrical signals.

9. The laser mapping line projection instrument according to claim 5, characterized in that: The rotating gear (16) is a non-circular gear, and the curvature of the fixed rack (17) can always remain in contact with the outer tooth line of the rotating gear (16).

10. The laser mapping projection instrument according to claim 3, characterized in that: The counterweight box (6) has a counterweight groove at its bottom.

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