A three-dimensional laser scanner fixture

Abstract

The application discloses a three-dimensional laser scanner fixing device, and belongs to the technical field of supports, which comprises a tripod, wherein the tripod is composed of three supporting legs and a support; the three supporting legs are rotatably installed on the support; a scanner body is installed on the support; and a protection mechanism is arranged on the support; the protection mechanism comprises multiple protection rods movably arranged on the support; the top of the multiple protection rods is jointly fixed with a protection cage; a first air bag is arranged in the protection cage; the bottom of the multiple protection rods is fixed with connecting rods; a first spring is sleeved on the protection rod; one end of the first spring is connected with the support, and the other end is connected with the connecting rod; and the multiple connecting rods are jointly fixed with a movable ring plate; the three-dimensional laser scanner fixing device solves the problems of poor stability and easy shaking of the conventional tripod fixing mode, guarantees the measurement accuracy, realizes all-around protection of the scanner when falling down through a double protection structure, and avoids equipment damage.

Description

Technical Field

[0001] This invention relates to the field of bracket technology, and more specifically to a three-dimensional laser scanner fixing device. Background Technology

[0002] As a high-precision measuring device, the 3D laser scanner has been widely used in various fields such as surveying and exploration, construction engineering, reverse engineering, cultural relic protection, and industrial inspection due to its rapid, efficient, and accurate spatial data acquisition capabilities. This device scans the target area by emitting a laser beam to obtain the target's three-dimensional spatial coordinates, contour features, and texture information. Its measurement accuracy directly determines the reliability of subsequent data processing, model building, and engineering applications; therefore, extremely high requirements are placed on the stability and safety of the equipment during use.

[0003] Currently, in practical applications, 3D laser scanners commonly use tripods as a fixed support. The scanner is mounted on top of the tripod, and the scanner's posture is stabilized by adjusting the height and level of the tripod to complete data acquisition. Existing tripods are mostly made of lightweight metal or carbon fiber, with a relatively simple structural design, mainly consisting of legs and a base. Their core function is only to support the scanner and perform preliminary leveling, meeting basic installation and usage requirements.

[0004] However, this traditional tripod fixing method has many inherent drawbacks and is difficult to adapt to the high requirements of stability and safety for 3D laser scanners. The specific problems are as follows: First, due to the flimsy structure of the tripod legs, the tripod is prone to wobbling under slight external forces (such as collisions or wind). Furthermore, 3D laser scanners integrate precision optical prisms, high-speed rotary motors, angle encoders, laser ranging modules, and tilt sensors, making them extremely sensitive to vibration. Even minor tremors can cause laser scanning path shifts and scanning point drifts, resulting in a large number of point cloud noise and discrete specks. This distorts the measurement data, severely impacting accuracy and failing to meet the demands of high-precision surveying and industrial inspection.

[0005] Secondly, due to the high center of gravity and limited base support area of ​​the tripod, it is extremely prone to tipping over when subjected to external forces such as collisions or impacts. 3D laser scanners are precision and expensive equipment with extremely poor impact resistance in their internal components. If the tripod tipps over, it will not only cause damage to the outer casing, lens, and interfaces, but also lead to hidden damage such as displacement of internal optical lenses, bending of the rotating prism shaft, misalignment of the angle encoder, and drift of calibration parameters. This can even cause permanent inaccuracies and render the equipment unusable, resulting in significant economic losses, interrupting measurement operations, and impacting project progress. Summary of the Invention

[0006] The purpose of this invention is to provide a fixing device for a 3D laser scanner, which solves the following technical problems: The tripod fixing method currently used for 3D laser scanners has the defects of simple structure, weak resistance to external interference, easy shaking and easy tipping, which cannot effectively guarantee the stability and safety of the scanner. It not only affects the measurement accuracy, but also easily leads to equipment damage, making it difficult to meet the usage requirements of actual operation scenarios.

[0007] The objective of this invention can be achieved through the following technical solutions: A three-dimensional laser scanner fixing device includes a tripod, which consists of three legs and a support. The three legs are rotatably mounted on the support, the scanner body is mounted on the support, and a protective mechanism is provided on the support. The protective mechanism includes multiple protective rods movably mounted on supports. A protective cage is fixed to the top of the multiple protective rods. A first airbag is installed inside the protective cage. A connecting rod is fixed to the bottom of each of the multiple protective rods. A first spring is fitted onto each protective rod. One end of the first spring is connected to the support, and the other end is connected to the connecting rod. A movable ring plate is fixed between the multiple connecting rods. A second airbag is installed on the upper surface of the movable ring plate. A connecting tube connects the first airbag and the second airbag. A central column is fixed to the lower surface of the support, a support column is movably mounted on the central column, a threaded sleeve is also provided on the central column, a support plate is fixed to the bottom of the support column, multiple support rods are provided on the support plate, suction cups are installed at the bottom of the support rods, and a triggering mechanism is provided between the multiple support rods and the movable ring plate.

[0008] As a further aspect of the present invention: both the first airbag and the second airbag are annular structures, and the inner wall of the first airbag is provided with damping sponge.

[0009] As a further aspect of the present invention: multiple insert rods are fixed on the upper surface of the movable ring plate, and multiple insert cylinders are fixed on the lower surface of the support. The positions of the insert rods and insert cylinders correspond to each other, and rubber pads are provided on the side walls of the insert rods.

[0010] As a further aspect of the present invention, it also includes multiple mounting blocks, which are respectively fixed on multiple support rods, and a second spring is connected between the mounting blocks and the support plate.

[0011] As a further aspect of the present invention: the triggering mechanism includes multiple L-shaped blocks fixed to the lower surface of the support, a telescopic rod is fixed on the mounting block, a first wedge block is fixed to the top of the telescopic rod, multiple spring rods are fixed to the bottom side wall of the central column, and a second wedge block is fixed to one end of the spring rod.

[0012] As a further aspect of the present invention: the telescopic rod includes a hollow outer rod, the bottom end of which is fixed to a mounting block, an inner rod is movably disposed inside the outer rod, the first wedge block is fixed to the top of the inner rod, a plurality of fixed teeth are evenly disposed on both sides of the inner rod, and movable teeth are rotatably mounted on both sides of the inner wall of the outer rod, and a pull rope is connected between the movable teeth and the inner wall of the outer rod.

[0013] As a further aspect of the present invention: a limiting ring plate is fixed at the bottom of the central column, and limiting blocks are fixed on the side walls of the inner rods near the central column.

[0014] The beneficial effects of this invention are: (1) This invention achieves a firm fixation of the entire device to the ground by setting auxiliary support structures such as a central column, support column and support plate on the tripod, and using suction cups. This changes the traditional tripod fixation method that relies solely on the point contact between the support legs and the ground, increases the fixation strength between the device and the ground, and can effectively resist external interference (such as wind, slight collision, ground micro-vibration, etc.), avoiding tripod swaying or gimbal shift. Since the 3D laser scanner is extremely sensitive to vibration, the stable fixation design of this device can effectively avoid problems such as laser beam path shift, scanning point drift, and increased point cloud noise caused by swaying, ensuring the accuracy of measurement data and meeting the usage requirements of high-precision surveying, industrial inspection and other scenarios. (2) The protective cage on the support of this invention adopts the design of "no obstruction during normal use and protection triggered when tilted". It will not affect the normal scanning field of view and data acquisition operation of the scanner, and can quickly rise through the trigger mechanism to protect the scanner body when the tripod is accidentally knocked over. During the fall, the protective cage directly bears all contact and friction with the ground, avoiding direct impact between the scanner body and the ground, and plays the first protection role; at the same time, it will squeeze the second airbag, so that the gas in the second airbag is quickly squeezed into the first airbag. The first airbag quickly expands and wraps the scanner body. Even if the scanner becomes loose due to the fall, the impact force can be offset by the buffering effect of the airbag, realizing double protection for the scanner body, effectively protecting the internal precision components and external structure of the scanner, preventing equipment damage, and reducing economic losses and work interruption caused by equipment failure. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a first-view structural diagram of the entire invention; Figure 2 This is a second-view structural diagram of the entire invention; Figure 3 This is a schematic diagram of the protective cage and support of the present invention in a disassembled state; Figure 4 This is a schematic diagram of the structure of the protective cage of the present invention; Figure 5 This is a schematic diagram of the structure of the central column of the present invention; Figure 6 yes Figure 2 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the internal structure of the telescopic rod of the present invention.

[0017] In the diagram: 1. Support; 2. Leg; 3. Protective rod; 4. Protective cage; 5. First airbag; 6. Connecting rod; 7. First spring; 8. Movable ring plate; 9. Second airbag; 10. Connecting pipe; 11. Insert rod; 12. Insert cylinder; 13. Central column; 14. Support column; 15. Threaded sleeve; 16. Support plate; 17. Support rod; 18. Suction cup; 19. Mounting block; 20. Second spring; 21. Telescopic rod; 2101. Outer rod; 2102. Inner rod; 2103. Fixed tooth; 2104. Movable tooth; 22. First wedge block; 23. Spring rod; 24. Second wedge block; 25. L-shaped block; 26. Limiting block; 27. Limiting ring plate.

[0018] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual size and shape of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1 to 7As shown, this invention is a three-dimensional laser scanner mounting device, including a tripod consisting of three legs 2 and a base 1. The three legs 2 are rotatably mounted on the base 1, and the scanner body is mounted on the base 1. A protective mechanism is provided on the base 1. The protective mechanism includes multiple protective rods 3 movably mounted on the base 1. A protective cage 4 is fixed to the top of the multiple protective rods 3, and a first airbag 5 is provided inside the protective cage 4. A connecting rod 6 is fixed to the bottom of each of the multiple protective rods 3, and a first spring 7 is fitted on the protective rod 3. One end of the support 7 is connected to the support 1, and the other end is connected to the connecting rod 6. A movable ring plate 8 is fixed together among multiple connecting rods 6. A second airbag 9 is provided on the upper surface of the movable ring plate 8. A connecting pipe 10 connects the first airbag 5 and the second airbag 9. A central column 13 is fixed to the lower surface of the support 1. A support column 14 is movably mounted on the central column 13. A threaded sleeve 15 is also provided on the central column 13. A support plate 16 is fixed to the bottom end of the support column 14. Multiple support rods 17 are provided on the support plate 16. A [missing information - likely a device or component] is installed at the bottom of the support rods 17. The suction cup 18, multiple support rods 17, and movable ring plate 8 are provided with a triggering mechanism; it also includes multiple mounting blocks 19, which are respectively fixed on the multiple support rods 17, and a second spring 20 connects the mounting blocks 19 and the support plate 16; if the measurement is performed indoors, first install the scanner body on the support 1, then place the tripod at the designated measurement location, then open the three support legs 2, adjust the height of the scanner body, and then loosen the threaded sleeve 15 to allow the support column 14 to move up and down, so that the support plate 16 can move up and down. Move the support rod 17 downwards closer to the ground to compress the second spring 20. Since indoor surfaces are mostly flat, such as cement or tiles, the suction cup 18 can be directly attached to the ground. If the measurement is performed outdoors and there is no flat ground, the suction cup 18 can be replaced with feet to meet the needs of fixing the tripod outdoors. This way, the tripod can be stably fixed at the measurement location, preventing the tripod from shaking or shifting when encountering external interference. If the tripod is bumped, the suction cup 18 can also be attached to the ground to prevent the tripod from tipping over directly after being bumped. During use, the first spring 7 is in a stretched state, the movable ring plate 8 and the protective cage 4 are both in a low position, and the second airbag 9 is also stretched. It has a large volume and contains a lot of air. The first airbag 5 is under slight negative pressure and contains only a small amount of gas. In this way, the first airbag 5 does not come into contact with the scanner body during use, so as to avoid affecting the rotation of the scanner body. If the tripod is accidentally knocked over and tilts, the suction cup 18 will be completely detached from the ground. Under the action of the triggering mechanism, the movable ring plate 8 and the protective cage 4 will rise rapidly. The protective cage 4 will shield the scanner body and directly bear all contact and friction with the ground, preventing the scanner body from directly impacting the ground and playing the first line of protection. When the movable ring plate 8 rises, it will also compress the second airbag 9. The air in the second airbag 9 will enter the first airbag 5 through the connecting tube 10. The first airbag 5 will quickly expand and wrap around the scanner body. Even if the scanner becomes loose due to a fall, the impact force can be offset by the cushioning effect of the airbag, achieving double protection for the scanner body.

[0021] See Figure 3 and Figure 4 Both the first airbag 5 and the second airbag 9 are annular structures. The inner wall of the first airbag 5 is provided with damping sponge. After the first airbag 5 is inflated, the damping sponge is in direct contact with the scanner body. Even if the scanner body is loosened due to a fall, the damping sponge can effectively absorb energy and reduce rebound.

[0022] See Figure 2 Multiple insertion rods 11 are fixed to the upper surface of the movable ring plate 8, and multiple insertion cylinders 12 are fixed to the lower surface of the support 1. The positions of the insertion rods 11 and the insertion cylinders 12 correspond, and rubber pads are provided on the side walls of the insertion rods 11. In order to further improve the protection effect and avoid high-frequency vibration after falling, when the movable ring plate 8 rises close to the support 1, the insertion rods 11 will be inserted into the insertion cylinders 12. The rubber pads provided on the insertion rods 11 can increase the friction and prevent the first spring 7 from repeatedly rebounding. When the movable ring plate 8 rises to the limit of its stroke, the first spring 7 is in a compressed state and then gradually returns to its original position. At this time, the gas in the first airbag 5 will flow into the second airbag 9 to relieve pressure. Most of the impact energy is dissipated through the gas outflow and converted into heat energy and kinetic energy, rather than being stored as potential energy like a pure elastic airbag. This prevents the scanner body from being triggered to resonate by the rebound of the first airbag 5.

[0023] See Figure 2 , Figure 5 and Figure 6The triggering mechanism includes multiple L-shaped blocks 25 fixed to the lower surface of the support 1. A telescopic rod 21 is fixed on the mounting block 19. A first wedge block 22 is fixed to the top of the telescopic rod 21. Multiple spring rods 23 are fixed to the bottom side wall of the central column 13. A second wedge block 24 is fixed to one end of the spring rod 23. When in use, the second spring 20 is in a compressed state. The second wedge block 24 fixes the position of the L-shaped block 25. The tripod tilts after a slight collision. If only one suction cup 18 leaves the ground, the other two suction cups 18 will still adhere to the ground, which can prevent the tripod from tipping over. Only when subjected to a more violent collision will all three suction cups 18 leave the ground and the tripod will fall over. At this time, under the action of the second spring 20, multiple support rods 17 move upward, pushing the first wedge block 22 upward through the telescopic rod 21. The second wedge block 24 is squeezed and moves horizontally. The L-shaped block 25 loses its limit. The first spring 7 drives the movable ring plate 8 to rise rapidly and squeeze the second airbag 9.

[0024] See Figures 5 to 7 The telescopic rod 21 includes a hollow outer rod 2101, the bottom end of which is fixed to the mounting block 19. An inner rod 2102 is movably disposed inside the outer rod 2101. A first wedge block 22 is fixed to the top of the inner rod 2102. Multiple fixing teeth 2103 are evenly arranged on both sides of the inner rod 2102. Movable teeth 2104 are rotatably installed on both sides of the inner wall of the outer rod 2101. A pull rope is connected between the movable teeth 2104 and the inner wall of the outer rod 2101. A limit ring plate 27 is fixed to the bottom of the central column 13. The inner rod 2102 is close to the side wall of the central column 13. Each of the upper and lower limit blocks 26 is fixed. In order to ensure that the triggering mechanism can work normally at different heights, when the support column 14 is moved downward, the outer rod 2101 will move downward synchronously. At this time, the movable tooth 2104 will automatically deflect. Under the action of the limit ring plate 27 and the limit block 26, the height of the inner rod 2102 remains unchanged. Therefore, even if the height of the tripod is adjusted, the first wedge block 22 will always be in contact with the second wedge block 24. When the triggering mechanism is working, under the action of the movable tooth 2104 and the fixed tooth 2103, the telescopic rod 21 moves upward, thereby pushing the second wedge block 24 to move horizontally.

[0025] The working principle of this invention is as follows: First, select a suitable ground fixing component according to the measurement scenario. If the measurement is performed indoors, since indoor floors are mostly flat surfaces such as cement or tiles, a suction cup 18 is sufficient. The suction cup 18 can be replaced with feet to adapt to complex outdoor ground environments. Install the scanner body on the tripod support 1. After installation, move the tripod to the designated measurement location, open the three support legs 2 and adjust them to a suitable height to ensure that the scanner body is in a position conducive to data acquisition. Then, loosen the threaded sleeve 15 on the central column 13 fixed to the lower surface of the support 1, so that the support column 14 can move freely up and down. Pushing the support column 14 downwards causes the support plate 16 fixed at its bottom to approach the ground. Then, multiple support rods 17 move downwards, so that the second spring 20 connecting the mounting block 19 and the support plate 16 is in a compressed state. Taking the suction cup 18 as an example, multiple suction cups 18 are directly attached to the ground. At this time, through the above-mentioned fixing method, even if external force interference is encountered, the tripod can be effectively prevented from shaking or shifting in position. Even if the tripod is subjected to human collision, the fixing effect of the suction cup 18 can effectively prevent the tripod from tipping over directly. This not only ensures the stability of the measurement process, but also adapts to different scenario requirements and improves the convenience of operation. During normal use of the scanner, the protective mechanism is in an unprotected state to avoid affecting the operation. Specifically, at this time, the first spring 7 is in a stretched state, and both the movable ring plate 8 and the protective cage 4 are in a low position. The protective cage 4 will not block the scanner body, ensuring that the scanning field of view of the scanner body is not obstructed. At the same time, the second airbag 9 set on the upper surface of the movable ring plate 8 is stretched as the movable ring plate 8 is in a low position. It has a large volume and stores a lot of air inside. The first airbag 5 set inside the protective cage 4 is in a slightly negative pressure state, with only a small amount of gas inside. Therefore, the first airbag 5 will not come into contact with the scanner body, avoiding interference with the normal rotation and angle adjustment of the scanner body, ensuring the smoothness of data acquisition, taking into account both protection and ease of use, and improving work efficiency. If the tripod is accidentally knocked over, the suction cup 18 will completely detach from the ground, triggering the safety mechanism. During normal scanner use, the second spring 20 is compressed, and the second wedge block 24 limits and fixes the L-shaped block 25 (e.g., ...). Figure 6 As shown, when the tripod is subjected to a violent impact that causes all three suction cups 18 to detach from the ground, under the elastic reset action of the second spring 20, multiple support rods 17 move upward, driving the telescopic rod 21 to move upward synchronously. During the upward movement, the first wedge block 22 is pushed upward, and the second wedge block 24 is compressed and moves horizontally along the direction of the spring rod 23, causing the L-shaped block 25 to lose its limiting constraint. At this time, the first spring 7, which is in a stretched state, quickly and elastically resets, driving the movable ring plate 8 and the protective cage 4 to rise rapidly. The protective cage 4 instantly blocks the scanner body. During the tripod tilting process, the protective cage 4 directly bears all contact and friction with the ground, preventing the scanner body from directly impacting the ground, thus playing the first line of protection. At the same time, when the movable ring plate 8 rises, it will simultaneously squeeze the second airbag 9 on its upper surface. The air in the second airbag 9 flows into the first airbag 5 through the connecting pipe 10, causing the first airbag 5, which was originally in a slightly negative pressure state, to expand rapidly and tightly wrap around the scanner body. The inner wall of the first airbag 5 is provided with damping sponge. Even if the scanner body becomes loose due to falling, the damping sponge can effectively absorb energy, reduce the rebound of the scanner body, further buffer the impact force, and achieve double protection for the scanner body. Furthermore, when the movable ring plate 8 rises close to the support 1, the insertion rod 11 will insert into the corresponding insertion cylinder 12. The rubber pad can increase the friction between the insertion rod 11 and the insertion cylinder 12, effectively preventing the first spring 7 from repeatedly rebounding when it resets, thus preventing the scanner body from being affected by high-frequency vibration. When the movable ring plate 8 rises to its travel limit, the first spring 7 is in a compressed state and then gradually returns to its elastic state. At this time, the gas in the first airbag 5 will flow back to the second airbag 9 through the connecting pipe 10 to relieve pressure. Most of the impact energy is dissipated through the gas flow and converted into heat and kinetic energy, rather than storing energy as potential energy like a purely elastic airbag. This prevents the scanner body from triggering resonance due to the rebound of the first airbag 5, further protecting the scanner's internal precision components.

[0026] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A three-dimensional laser scanner mounting device, comprising a tripod, the tripod consisting of three legs (2) and a base (1), the three legs (2) being rotatably mounted on the base (1), and the scanner body being mounted on the base (1), characterized in that, The support (1) is equipped with a protective mechanism; The protective mechanism includes multiple protective rods (3) movably mounted on a support (1). A protective cage (4) is fixed to the top of the multiple protective rods (3). A first airbag (5) is installed inside the protective cage (4). A connecting rod (6) is fixed to the bottom of each of the multiple protective rods (3). A first spring (7) is fitted on the protective rod (3). One end of the first spring (7) is connected to the support (1), and the other end is connected to the connecting rod (6). A movable ring plate (8) is fixed between the multiple connecting rods (6). A second airbag (9) is installed on the upper surface of the movable ring plate (8). A connecting pipe (10) is connected between the first airbag (5) and the second airbag (9). A central column (13) is fixed on the lower surface of the support (1). A support column (14) is movably arranged on the central column (13). A threaded sleeve (15) is also provided on the central column (13). A support plate (16) is fixed at the bottom of the support column (14). Multiple support rods (17) are provided on the support plate (16). A suction cup (18) is installed at the bottom of the support rods (17). A triggering mechanism is provided between the multiple support rods (17) and the movable ring plate (8). It also includes multiple mounting blocks (19), which are respectively fixed on multiple support rods (17), and a second spring (20) is connected between the mounting blocks (19) and the support plate (16). The triggering mechanism includes multiple L-shaped blocks (25) fixed on the lower surface of the movable ring plate (8). A telescopic rod (21) is fixed on the mounting block (19). A first wedge block (22) is fixed on the top of the telescopic rod (21). Multiple spring rods (23) are fixed on the bottom side wall of the central column (13). A second wedge block (24) is fixed at one end of the spring rod (23). When in use, the second spring (20) is in a compressed state, and the second wedge block (24) fixes the position of the L-shaped block (25). When the tripod is violently impacted, causing all three suction cups (18) to leave the ground, under the action of the second spring (20), multiple support rods (17) move upward, and push the first wedge block (22) upward through the telescopic rod (21). The second wedge block (24) is squeezed and moves horizontally, and the L-shaped block (25) loses its limit. The first spring (7) drives the movable ring plate (8) to rise rapidly and squeeze the second airbag (9).

2. The three-dimensional laser scanner fixing device according to claim 1, characterized in that, Both the first airbag (5) and the second airbag (9) are annular structures, and the inner wall of the first airbag (5) is provided with damping sponge.

3. The three-dimensional laser scanner fixing device according to claim 1, characterized in that, The upper surface of the movable ring plate (8) is fixed with multiple insert rods (11), and the lower surface of the support (1) is fixed with multiple insert cylinders (12). The positions of the insert rods (11) and the insert cylinders (12) are corresponding, and rubber pads are provided on the side walls of the insert rods (11).

4. The three-dimensional laser scanner fixing device according to claim 1, characterized in that, The telescopic rod (21) includes a hollow outer rod (2101), the bottom end of which is fixed to the mounting block (19). An inner rod (2102) is movably arranged inside the outer rod (2101). The first wedge block (22) is fixed to the top of the inner rod (2102). Multiple fixed teeth (2103) are evenly arranged on both sides of the inner rod (2102). Movable teeth (2104) are rotatably installed on both sides of the inner wall of the outer rod (2101). A pull rope is connected between the movable teeth (2104) and the inner wall of the outer rod (2101).

5. A three-dimensional laser scanner fixing device according to claim 4, characterized in that, A limiting ring plate (27) is fixed at the bottom of the central column (13), and a limiting block (26) is fixed on the side wall of the inner rod (2102) near the central column (13).

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