A three-dimensional scanning pre-adjusting positioning tool device suitable for the long and narrow structure of a pipe gallery

Abstract

The application discloses a three-dimensional scanning pre-adjusting positioning tool device suitable for long and narrow structure of pipe gallery, and belongs to the technical field of precise positioning tool of pipe gallery construction. The device comprises a traveling chassis, a horizontal fine adjustment assembly, a lifting adjustment assembly, a rotary fine adjustment assembly, a pitch angle adjustment assembly, a device fixing assembly and a target calibration assembly. The traveling chassis is provided with traveling wheels at the bottom and thrust bearing seats at the four corners. The horizontal fine adjustment assembly is provided with four independently adjusted supporting lead screws and a mounting bottom plate in threaded cooperation. The mounting bottom plate is provided with a level. The lifting adjustment assembly adopts a stepless lifting structure in cooperation of a threaded lead screw and a threaded sleeve. The rotary fine adjustment assembly and the pitch angle adjustment assembly both adopt a gear disc locking structure, and the adjustment range covers 360 degrees horizontally and 0-90 degrees in pitch. The target mounting seat is arranged at the front end and the rear end of the chassis. The application solves the problems of difficulty in three-dimensional scanning continuous operation and data splicing deviation accumulation in long and narrow space of the pipe gallery, and realizes long-distance high-precision continuous scanning positioning.

Description

Technical Field

[0001] This invention belongs to the field of precision positioning tooling technology for pipe gallery construction, specifically relating to a three-dimensional scanning pre-adjustment positioning tooling device adapted to the narrow structure of pipe galleries. Background Technology

[0002] Integrated utility tunnels are typically long and narrow enclosed structures, characterized by their large length, narrow width, long depth, and enclosed working space. The application of 3D scanning technology in tunnel construction positioning, formwork verification, and embedded part positioning is becoming increasingly widespread. However, existing scanning positioning equipment mainly falls into two categories, both of which have significant technical limitations.

[0003] The first type is a dedicated 3D scanning device for tunnel segments and molds. It employs a truss-type fixed-station structure and can only perform point-to-point inspections, making it unsuitable for continuous scanning operations over long distances of hundreds of meters in utility tunnels, resulting in extremely low operational efficiency. The second type is auxiliary equipment for scanning electromechanical pipelines. It uses a fixed tripod with telescopic support legs, a static setup mode with no mobility or continuous operation capability. It can only perform single-point positioning and cannot meet the requirements for continuous linear scanning in narrow utility tunnel passages.

[0004] Meanwhile, existing tooling height adjustment methods mostly use traditional pin-hole type gear adjustment, which can only achieve intermittent height adjustment, lacking precision and unable to meet the requirements of precision scanning calibration; and there is no dedicated data stitching calibration structure, resulting in data stitching misalignment and deviation accumulation problems during long-distance scanning. In addition, the existing counterweight structure is only a passive ballast counterweight, which can only balance the center of gravity of the equipment and cannot actively assist in chassis stability. Summary of the Invention

[0005] To address the technical challenges of existing technologies, such as fixed workstations and static erection fixtures being unsuitable for continuous operation in long, narrow utility tunnels, insufficient precision in lifting and adjustment, and accumulated data splicing deviations, this invention provides a three-dimensional scanning and pre-adjustment positioning fixture adapted to the narrow structure of utility tunnels. This invention employs a combination of a mobile, narrow-structure-adaptive chassis, infinitely adjustable screw lifting, full-dimensional mechanical pre-adjustment, and rapid target calibration to achieve long-distance, continuous, high-precision three-dimensional scanning and positioning of utility tunnels.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of a pipe gallery, comprising a walking chassis, a horizontal fine-tuning component, a lifting adjustment component, a rotation fine-tuning component, a pitch angle adjustment component, an equipment fixing component, and a target calibration component; The bottom of the walking chassis is provided with walking wheels, and the four corners of the walking chassis are provided with thrust bearing seats; The horizontal fine-tuning assembly includes four support screws and a mounting base plate. The four support screws are rotatably mounted on the four thrust bearing seats, and the four support screws are threadedly connected to the mounting base plate. Each support screw is independently adjustable to correct the levelness of the mounting base plate. A level is provided on the mounting base plate. The lifting adjustment assembly includes a threaded sleeve and a threaded screw. The threaded sleeve is fixed to the mounting base plate, and the threaded screw is threadedly engaged with the threaded sleeve. A locking nut is provided on the threaded screw, and the top end of the threaded screw is connected to the rotary fine-tuning assembly through a flange. The rotary fine-tuning assembly includes a rotary shaft seat, inside which are a compression spring and a ball retainer. The side wall of the rotary shaft seat is provided with a ball bearing hole, in which a ball bearing is installed. The ball retainer is connected to a trapezoidal push rod. The pitch angle adjustment assembly includes a tilting bearing, which includes a first bearing housing and a second bearing housing. The first bearing housing is sleeved on the outside of the rotating bearing, and a ring of ball retaining grooves is formed on the inner wall of the first bearing housing. Racks are respectively provided on the contact end faces of the rotating bearing and the tilting bearing. When the ball falls into the ball retaining groove, the two racks mesh with each other to lock the relative rotation between the rotating bearing and the tilting bearing. The device fixing assembly includes a clamping platform, and the second shaft housing also contains a base rotating shaft and an eccentric gear shaft. The clamping platform is mounted on the base rotating shaft via two bearings, and the bottom of the clamping platform has a fan-shaped toothed belt. An eccentric gear is mounted on the eccentric gear shaft, and one end of the eccentric gear shaft has a spline, through which a control wheel is mounted. The outer edge of the control wheel has a first tooth. The end face of the flipping shaft housing opposite to the control wheel has a second tooth, and the first tooth engages with the second tooth. When the eccentric gear shaft is rotated to engage the eccentric gear with the toothed belt, the control wheel is pushed to slide along the spline, causing the first tooth to engage with the second tooth, thereby locking the angle between the clamping platform and the flipping shaft housing. The clamping platform is equipped with a clamping slider; The target calibration component includes a target mounting base, which is located at the front and rear ends of the walking chassis.

[0007] Preferably, the chassis is a one-piece cast steel structure, and the chassis is equipped with handrails.

[0008] Preferably, the traveling wheels include two sets of directional traveling wheels and one set of omnidirectional guide wheels, and the traveling wheels are equipped with a parking locking mechanism.

[0009] Preferably, the level includes an X-axis level and a Y-axis level.

[0010] Preferably, the top of the support screw is provided with an adjusting handwheel, and the adjusting handwheel is provided with a crank handle.

[0011] Preferably, the threaded screw is provided with a hexagonal operating end for use with a wrench to rotate the threaded screw.

[0012] Preferably, the stepped groove of the rotating shaft seat is provided with a compression spring mounting hole at the root, and the compression spring is embedded in the mounting hole.

[0013] Preferably, the bead holder and the trapezoidal push rod are connected by threads.

[0014] Preferably, six balls are evenly distributed along the circumference of the rotating shaft seat.

[0015] Preferably, an alloy sleeve is provided in the shaft hole of the flipping shaft seat, and the eccentric gear shaft passes through the alloy sleeve.

[0016] Preferably, the clamping slider is provided with a locking screw for locking the clamping slider onto the clamping platform.

[0017] Preferably, the upper surface of the clamping platform is provided with an anti-slip and shock-absorbing pad layer.

[0018] Preferably, the target mounting base is a perforated base that is welded and fixed to the front and rear ends of the chassis, and the target mounting base is provided with an insertion hole that mates with the target rod. Beneficial effects

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. For the narrow and enclosed space of the utility tunnel, the horizontal adjustment, lifting adjustment, rotation adjustment, pitch adjustment and target calibration are integrated into the mobile chassis, realizing continuous operation of one-stop scanning, one-stop movement and one-stop calibration. Unlike the single-point erection mode of fixed workstation tripod, it greatly improves the scanning efficiency of long-distance utility tunnels.

[0020] 2. The horizontal fine-tuning component adopts a four-point independent lead screw structure, which, together with high-precision X and Y level instruments, can eliminate the equipment tilt caused by local unevenness of the pipe gallery floor, and ensure the horizontal accuracy of the scanning equipment.

[0021] 3. The lifting adjustment component adopts a stepless lifting structure with a threaded screw and a threaded sleeve, which ensures smooth lifting and precise adjustment. With the help of the locking nut, it achieves rigid locking after lifting, avoiding height drift during scanning.

[0022] 4. Both the rotation fine-tuning component and the pitch angle adjustment component adopt a gear plate locking structure, with an adjustment range covering 360° horizontally and 0°-90° pitch. They can achieve precise positioning and rigid locking at any angle, adapting to the multi-directional scanning needs of the pipe gallery floor, side walls, and top plate.

[0023] 5. The target mounting base is located at the front and rear of the chassis. After the target is installed, it moves with the tooling as a whole. During each scan, the front and rear targets form continuous splicing control points. The station calibration can be completed without additional measurement and layout, which completely solves the problem of accumulated splicing deviation of long-distance scan data. Attached Figure Description

[0024] Figure 1 This is a front view of the overall assembly structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the horizontal fine-tuning component structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the lifting adjustment component structure according to an embodiment of the present invention; Figure 4 This is a cross-sectional schematic diagram of the rotation fine-tuning component and the pitch angle adjustment component according to an embodiment of the present invention; Figure 5 This is an external view of the rotating shaft seat according to an embodiment of the present invention; Figure 6 for Figure 5 Top view of the central rotary bearing; Figure 7 Schematic diagram of the clamping platform and flipping bearing structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the usage state of an embodiment of the present invention; Figure 9 This is a schematic diagram showing the connection between the clamping platform and the 3D scanner in an embodiment of the present invention; The meanings of the markings in the diagram are as follows: 1. Walking chassis, 2. Walking wheels, 3. Thrust bearing housing, 4. Support screw, 5. Mounting base plate, 6. Level, 7. Threaded sleeve, 8. Threaded screw, 9. Locking nut, 10. Flange, 11. Rotary bearing seat, 12. Compression spring, 13. Ball catcher, 14. Ball bearing, 15. Trapezoidal push rod, 16. Tilting bearing seat, 17. Ball catcher groove, 18. Rack, 19. Clamping platform, 20. Base shaft, 21. Toothed belt, 22. Eccentric gear shaft, 23. Control wheel, 2 4. Clamping slider; 25. Target mounting base; 26. Adjusting handwheel; 27. Crank handle; 28. Alloy sleeve; 29. ​​Locking screw; 30. Anti-slip and shock-absorbing pad; 31. Handrail; 32. Hexagonal operating end; 33. Parking locking mechanism; 34. First axle housing; 35. Second axle housing; 36. Bearing; 37. Eccentric gear; 38. Spline; 39. First tooth; 40. Second tooth; 41. Target rod; 42. 3D scanner; 43. Push key; 44. Ball bearing hole. Detailed Implementation

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] Please refer to Figures 1 to 5 The present invention provides a three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of pipe gallery, including a walking chassis 1, a horizontal fine adjustment component, a lifting adjustment component, a rotation fine adjustment component, a pitch angle adjustment component, an equipment fixing component, and a target calibration component.

[0029] The chassis 1 is a one-piece cast steel structure, serving both load-bearing and counterweight functions. A handrail 31 is provided on the chassis 1 for easy maneuvering. The bottom of the chassis 1 is equipped with wheels 2, including two sets of directional wheels and one set of omnidirectional guide wheels, ensuring smooth movement and flexible steering, suitable for narrow spaces in pipe gallery passageways. The omnidirectional guide wheels are equipped with a parking locking mechanism 33, which locks the wheels 2 upon reaching the scanning station, ensuring the chassis remains stationary during scanning. Thrust bearing seats 3 are located at the four corners of the chassis 1.

[0030] The leveling fine-tuning assembly includes four support screws 4 and a mounting base plate 5. The four support screws 4 are rotatably mounted on four thrust bearing seats 3. Each support screw 4 has an adjusting handwheel 26 on its top, with a crank handle 27 on each handwheel. The four support screws 4 are threadedly connected to the mounting base plate 5, and each support screw 4 can be adjusted independently to correct the levelness of the mounting base plate 5. The mounting base plate 5 is equipped with a level 6, including an X-axis level and a Y-axis level, used to indicate the levelness in the X-axis and Y-axis directions, respectively. In use, the operator adjusts the height of each of the four corners of the mounting base plate 5 one by one by rotating the adjusting handwheels 26 of each support screw 4 until both levels indicate level, thus completing the leveling calibration. Each support screw 4 has a self-locking function, automatically locking after adjustment without requiring additional tightening.

[0031] The lifting and adjusting assembly includes a threaded sleeve 7 and a threaded screw 8. The threaded sleeve 7 is fixed to the mounting base plate 5, and the threaded screw 8 is threadedly engaged with the threaded sleeve 7. A locking nut 9 and a hexagonal operating end 32 are provided on the threaded screw 8 for rotating it with a wrench. The top of the threaded screw 8 is connected to a rotary fine-tuning assembly via a flange 10. In use, the locking nut 9 is loosened, and the hexagonal operating end 32 is rotated with a wrench to drive the threaded screw 8 to the target height. The locking nut 9 is then tightened to secure the screw.

[0032] The rotary fine-tuning assembly includes a rotary bearing 11. Inside the rotary bearing 11 are a compression spring 12 and a ball catcher 13. The side wall of the rotary bearing 11 has ball bearing holes 44, in which six balls 14 are evenly distributed along the circumference of the rotary bearing 11. The ball catcher 13 is connected to a trapezoidal push rod 15 via a threaded connection. A compression spring mounting hole is located at the root of the stepped groove of the rotary bearing 11, and the compression spring 12 is embedded within it. A cutout is located at the bottom of the stepped groove, and the large-diameter end of the trapezoidal push rod 15 is accommodated within the groove. A push key 43 is fixedly connected to the trapezoidal push rod 15, extending outward through the cutout. The operator can move the trapezoidal push rod 15 and the ball catcher 13 axially by pushing the push key 43.

[0033] The pitch angle adjustment assembly includes a tilting bearing 16, which comprises a first bearing housing 34 and a second bearing housing 35. The first bearing housing 34 is located outside the rotating bearing 11, and its inner wall has a ring of ball retaining grooves 17. Racks 18 are respectively provided on the contact surfaces of the rotating bearing 11 and the tilting bearing 16. The first bearing housing 34 is responsible for horizontal rotation locking. When the ball bearing 14 is engaged in the ball retaining groove 17, the two racks 18 mesh with each other, locking the relative rotation between the rotating bearing 11 and the tilting bearing 16. When the trapezoidal push rod 15 is pushed to disengage the ball bearing 14 from the ball retaining groove 17, the rotating bearing 11 and the tilting bearing 16 can rotate relative to each other, achieving 360° horizontal rotation adjustment.

[0034] The second-axis cabin 35 houses a base rotating shaft 20 and an eccentric gear shaft 22. The second-axis cabin 35 is responsible for locking the pitch angle. The clamping platform 19 is mounted on the base rotating shaft 20 via two bearings 36. The bottom of the clamping platform 19 has a fan-shaped toothed belt 21. An eccentric gear 37 is mounted on the eccentric gear shaft 22. One end of the eccentric gear shaft 22 has a spline 38, through which a control wheel 23 is mounted. The outer edge of the control wheel 23 has first teeth 39. The end face of the tilting bearing 16 opposite to the control wheel 23 has second teeth 40. When the eccentric gear shaft 22 is rotated to engage the eccentric gear 37 with the toothed belt 21, the control wheel 23 is pushed to slide along the spline 38, causing the first teeth 39 to engage with the second teeth 40, thereby locking the angle between the clamping platform 19 and the tilting bearing 16. An alloy sleeve 28 is provided in the shaft hole of the flipping bearing 16, and the base rotating shaft 20 and the eccentric gear shaft 22 pass through the alloy sleeve 28.

[0035] The equipment fixing assembly includes a clamping platform 19. A clamping slider 24 is provided on the clamping platform 19, and a locking screw 29 is provided on the clamping slider 24 for locking the clamping slider 24 onto the clamping platform 19. An anti-slip and shock-absorbing pad layer 30 is provided on the upper surface of the clamping platform 19.

[0036] The target calibration assembly includes a target mounting base 25. The target mounting base 25 is located at the front and rear ends of the chassis 1. The target mounting base 25 is a perforated seat that is welded and fixed to the front and rear ends of the chassis 1. The target mounting base 25 is provided with an insertion hole for the target rod. When in use, the target rod 41 can be inserted to complete the calibration.

[0037] The specific operating procedure for this device is as follows: S1. Tooling Deployment: Push the device into the pipe gallery channel. The omnidirectional guide wheels in the traveling wheels 2 provide steering flexibility, while the directional traveling wheels ensure straight-line movement. After reaching the scanning station, lock the parking locking mechanism 33 to lock the traveling wheels 2.

[0038] S2. Horizontal calibration: Observe the level 6 (X and Y directions), and adjust the height of the four corners of the mounting base 5 one by one by rotating the adjusting handwheel 26 on the top of each support screw 4 until both levels indicate horizontal and each support screw 4 is self-locking.

[0039] S3. Height Adjustment: Loosen the locking nut 9, and drive the threaded screw 8 to rise or fall to the target height by turning the hexagonal operating end 32 with a wrench, then tighten the locking nut 9 to fix it.

[0040] S4. Angle Adjustment: Push the trapezoidal push rod 15 to disengage the ball 14 from the ball groove 17, rotate and flip the bearing seat 16 to the target azimuth angle, release the trapezoidal push rod 15 to lock the ball 14 into the ball groove 17; rotate the control wheel 23 to drive the eccentric gear shaft 22 to rotate, so that the eccentric gear 37 meshes with the toothed belt 21 to adjust the pitch angle of the clamping platform 19 to the target position, push the control wheel 23 to slide along the spline 38, so that the first tooth 39 meshes with the second tooth 40 and locks them.

[0041] S5. Equipment installation: Place the 3D scanner 42 on the clamping platform 19, adjust the clamping slider 24 to clamp the equipment, tighten the locking screw 29 to fix it, and the anti-slip and shock-absorbing pad 30 provides cushioning and shock absorption.

[0042] S6. Target calibration: Insert target rods into the target mounting seats 25 at the front and rear ends of the walking chassis 1 respectively, and directly perform scanning station calibration. The front and rear targets form a continuous splicing control point.

[0043] S7. Continuous scanning: After completing one station scan, pull out the target rod, unlock the parking locking mechanism 33, push the device along the pipe gallery to the next station, reinsert the target rod, and repeat the scanning operation.

[0044] The above embodiments and accompanying drawings are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. The present invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the present invention do not depart from the spirit of the present invention and should also fall within the protection scope of the claims of the present invention. Other related technical structures not disclosed in detail in the present invention are existing technologies in the art.

Claims

1. A three-dimensional scanning pre-adjustment positioning fixture adapted to the narrow structure of a pipe gallery, characterized in that, It includes a walking chassis, a horizontal fine-tuning component, a height adjustment component, a rotation fine-tuning component, a pitch angle adjustment component, an equipment fixing component, and a target calibration component; The bottom of the walking chassis is provided with walking wheels, and the four corners of the walking chassis are provided with thrust bearing seats; The horizontal fine-tuning assembly includes four support screws and a mounting base plate. The four support screws are rotatably mounted on four thrust bearing seats, and the four support screws are threadedly connected to the mounting base plate. Each support screw is independently adjustable to correct the levelness of the mounting base plate. A level is provided on the mounting base plate. The lifting adjustment assembly includes a threaded sleeve and a threaded screw. The threaded sleeve is fixed to the mounting base plate, and the threaded screw is threadedly engaged with the threaded sleeve. A locking nut is provided on the threaded screw, and the top end of the threaded screw is connected to the rotary fine-tuning assembly through a flange. The rotary fine-tuning assembly includes a rotary shaft seat, inside which are a compression spring and a ball retainer. The side wall of the rotary shaft seat is provided with a ball bearing hole, in which a ball bearing is installed. The ball retainer is connected to a trapezoidal push rod. The pitch angle adjustment assembly includes a tilting bearing, which includes a first bearing housing and a second bearing housing. The first bearing housing is sleeved on the outside of the rotating bearing, and a ring of ball retaining grooves is formed on the inner wall of the first bearing housing. Racks are respectively provided on the contact end faces of the rotating bearing and the tilting bearing. When the ball falls into the ball retaining groove, the two racks mesh with each other to lock the relative rotation between the rotating bearing and the tilting bearing. The device fixing assembly includes a clamping platform, and the second shaft housing also houses a base rotating shaft and an eccentric gear shaft. The clamping platform is mounted on the base rotating shaft via two bearings, and the bottom of the clamping platform has a fan-shaped toothed belt. An eccentric gear is mounted on the eccentric gear shaft, and one end of the eccentric gear shaft has a spline, through which a control wheel is mounted. The outer edge of the control wheel has a first tooth. The end face of the flipping shaft seat opposite to the control wheel has a second tooth, and the first tooth engages with the second tooth. When the eccentric gear shaft is rotated to engage the eccentric gear with the toothed belt, the control wheel is pushed to slide along the spline, causing the first tooth to engage with the second tooth, thereby locking the angle between the clamping platform and the flipping shaft seat. The clamping platform is equipped with a clamping slider. The target calibration component includes a target mounting base, which is located at the front and rear ends of the walking chassis.

2. The three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of the pipe gallery according to claim 1, characterized in that: The chassis is a one-piece cast steel structure; handrails are provided on the chassis.

3. The three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of the pipe gallery according to claim 1, characterized in that: The traveling wheels include two sets of directional traveling wheels and one set of omnidirectional guide wheels, and the traveling wheels are equipped with a parking locking mechanism.

4. The three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of the pipe gallery according to claim 1, characterized in that: The top of the support screw is equipped with an adjusting handwheel, and the adjusting handwheel is equipped with a crank handle.

5. The three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of the pipe gallery according to claim 1, characterized in that: The threaded screw is provided with a hexagonal operating end, which is used to rotate the threaded screw with a wrench.

6. The three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of the pipe gallery according to claim 1, characterized in that: The ball bearings are evenly distributed in six parts along the circumference of the rotating shaft.

7. The three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of the pipe gallery according to claim 1, characterized in that: An alloy sleeve is provided inside the shaft hole of the flipping bearing, and the base rotating shaft and the eccentric gear shaft pass through the alloy sleeve.

8. The three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of the pipe gallery according to claim 1, characterized in that: The clamping slider is provided with a locking screw for locking the clamping slider onto the clamping platform.

9. The three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of the pipe gallery according to claim 1, characterized in that: The upper surface of the clamping platform is provided with an anti-slip and shock-absorbing pad layer.

10. The three-dimensional scanning pre-adjustment positioning fixture device adapted to the narrow structure of the pipe gallery according to claim 1, characterized in that: The target mounting base is a perforated base that is welded and fixed to the front and rear ends of the walking chassis. The target mounting base is provided with insertion holes that mate with the target rod.

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