A three-dimensional geometry profile measuring device

Abstract

The present application relates to a kind of three-dimensional geometry profile measuring devices, including measuring component, the measuring component includes laser range finder array, data collector and control module;The laser range finder array includes laser range finder, honeycomb fixed frame and acquisition control board, the inside of the honeycomb fixed frame is honeycomb, the number of the laser range finder is multiple, the laser range finder is fixed in corresponding honeycomb of honeycomb fixed frame, the laser range finder is connected acquisition control board, the acquisition control board is fixed in honeycomb fixed frame bottom, the acquisition control board connects data collector, the data collector connects control module.Compared with prior art, the present application has the advantages of wide application range, high accuracy etc..

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to a three-dimensional geometric contour measuring device. Background Technology

[0002] To date, China's construction industry remains a traditional, labor-intensive sector. While digitalization and informatization have become inevitable and profoundly transformed other industries, the construction industry continues to rely on traditional, extensive construction methods. 3D printing technology, after years of development, has been widely applied across various industries. In recent years, given its inherent attributes of digital design, intelligent control, and additive construction, which align perfectly with the technological development direction of China's construction industry, 3D printing has received in-depth research and rapid development.

[0003] Research revealed that various 3D printing head support systems exist, with guide rail and robotic arm types being the most common. Their common characteristic is that the printer head moves along a pre-set trajectory, resulting in a consistent material output at each printing stage. This approach is unsuitable for 3D printing on non-planar surfaces, hindering the full realization of 3D printing's advantages. This is particularly true in the initial support structure construction of mountain tunnels, where the surrounding rock surface is typically uneven, far exceeding the surface requirements of current 3D printing methods. Given these challenging construction conditions in mountain tunnels, traditional 3D printing technology is ill-suited for such environments.

[0004] Therefore, there is an urgent need to provide a device for measuring the three-dimensional geometric contours of object surfaces, which can achieve a more advanced and refined control mode of the printer head in 3D printing, as well as a wider range of applicability. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art, which is that 3D printing technology is difficult to carry out construction work in the initial support structure construction of mountain tunnels when the surface of the surrounding rock that the initial support is in contact with is usually uneven. Therefore, this invention provides a three-dimensional geometric contour measurement device.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A three-dimensional geometric contour measurement device includes a measurement component, which includes a laser rangefinder array, a data acquisition unit, and a control module.

[0008] The laser rangefinder array includes a laser rangefinder, a honeycomb fixing frame, and a data acquisition and control board. The interior of the honeycomb fixing frame is honeycomb-shaped. There are multiple laser rangefinders, which are fixed inside the honeycomb fixing frame. The laser rangefinders are connected to the data acquisition and control board, which is fixed at the bottom of the honeycomb fixing frame. The data acquisition and control board is connected to a data acquisition unit, which is connected to a control module.

[0009] Furthermore, the honeycomb cells are arranged in a rectangular array within a honeycomb fixing frame, which includes an odd number of rows and columns of honeycomb cells, and the cross-sectional shape of the honeycomb cells matches the shape of the laser rangefinder.

[0010] Furthermore, the axes of the honeycomb are radially distributed, with the axes of honeycombs in the same row or column lying on the same plane, and the planes containing the axes of honeycombs in the middle row and middle column being perpendicular to each other.

[0011] Furthermore, the laser rangefinder array also includes a protective shell for protecting the laser rangefinder, the cellular fixing frame, and the acquisition control board. The acquisition control board and the cellular fixing frame are both fixed inside the protective shell, and the protective shell is provided with through holes corresponding to the cellular arrangement positions.

[0012] Furthermore, the protective shell is provided with a connector, and the laser rangefinder array can be detachably fixed to an external device through the connector.

[0013] Furthermore, the data acquisition unit is a high-frequency data acquisition microcontroller used to power the laser rangefinder array and send data acquisition signals.

[0014] Furthermore, the acquisition control board includes a downlink port and an uplink port, the downlink port being connected to a laser rangefinder and the uplink port being connected to a data acquisition unit.

[0015] Furthermore, the wires of the laser rangefinder are led out through the bottom of the honeycomb holes and connected to the downlink port of the acquisition control board; the protective shell is provided with wire holes, and the wires connected to the uplink port of the acquisition control board are connected to the data acquisition unit through the wiring holes.

[0016] Furthermore, the control module includes a data parsing and processing system and a disk array. The data parsing and processing system is used to construct a local coordinate system from the distance data measured by the laser rangefinder array, and to draw and characterize the geometric contour of the measured object surface in the coordinate system. The disk array is used to store the data.

[0017] Furthermore, the laser rangefinder array is fixed on the motion support component, and the motion support component is connected to the control module.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) In this scheme, after measuring the surface condition of the tunnel surrounding rock by a laser rangefinder array, each laser rangefinder acquires the corresponding distance value and transmits the measured distance value to the data acquisition unit through the acquisition control board. The data acquisition unit then transmits and stores the data in the control module. The control module constructs a local spatial coordinate system of the tunnel surrounding rock based on the collected data. At the same time, the initial position of the laser rangefinder array is changed, and the surrounding rock morphology is continuously collected. The distance from the laser rangefinder array to the surrounding rock surface is continuously acquired. The coordinates of the points in the local spatial coordinate system stored in the control module and the geometric surfaces formed by the points in different spatial positions are iterated and updated. The coordinates measured by the laser rangefinder array in different local coordinate systems can be converted according to the movement trajectory of the origin of the laser rangefinder array to obtain the coordinate values ​​of the tunnel surrounding rock surface in the same coordinate system, thus obtaining the three-dimensional geometric shape of the tunnel surrounding rock. This invention enables printing on non-planar areas such as tunnel surrounding rock, overcoming the limitations of traditional 3D printing technology in controlling and setting the initial base surface and printing rhythm, thus expanding the applicability of 3D printing. Furthermore, the device described in this application can combine 3D printing construction environment information with printing motion control by collecting and applying three-dimensional topographic information of the target printing construction area, achieving more objective planning of the printing motion path, enriching the control modes of printing motion, and improving the functional adaptability of 3D printing.

[0020] (2) This solution fixes the laser rangefinder array to a moving support component connected to the control module. After the laser rangefinder array completes data acquisition at a certain position, the control module controls the moving support component to move, changing the initial position of the laser rangefinder array and acquiring surface information of the object at different positions. This improves the automation and operability of the device. At the same time, the movement of the moving support component improves the accuracy of the data acquired by the device, thereby obtaining a more accurate three-dimensional contour of the object surface. It can obtain one or more coordinate points to determine the amount of printing material required within the surface area, and achieve refined and precise 3D printing motion control. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the laser rangefinder array provided by the present invention;

[0022] Figure 2 A structural schematic diagram of a first-view calibration scene provided by the present invention;

[0023] Figure 3 A schematic diagram of the second perspective of the calibration scene provided by the present invention;

[0024] In the diagram: 1. Acquisition control board, 2. Cellular fixing frame, 3. Cellular, 4. Laser rangefinder, 5. Protective shell, 6. Laser rangefinder array. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] 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, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and 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 this invention.

[0029] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] Example 1

[0032] like Figure 1 As shown, a three-dimensional geometric contour measurement device includes a measurement component, which includes a laser rangefinder array 6, a data acquisition unit, and a control module.

[0033] The laser rangefinder array 6 includes a laser rangefinder 4, a honeycomb fixing frame, and a data acquisition control board 1. The inside of the honeycomb fixing frame is honeycomb-shaped. There are multiple laser rangefinders 4, which are fixed inside the honeycomb fixing frame. The laser rangefinders 4 are connected to the data acquisition control board 1, which is fixed at the bottom of the honeycomb fixing frame. The data acquisition control board 1 is connected to a data acquisition unit, which is connected to a control module.

[0034] Working principle: After the laser rangefinder array 6 measures the surface condition of the tunnel surrounding rock, each laser rangefinder 4 acquires the corresponding distance value and transmits the measured distance value to the data acquisition unit through the acquisition control board 1. The data acquisition unit then transmits and stores the data in the control module. The control module constructs a local spatial coordinate system of the tunnel surrounding rock based on the collected data. At the same time, it changes the initial position of the laser rangefinder array 6 and continuously acquires the morphology of the surrounding rock, continuously acquiring the distance from the laser rangefinder array 6 to the surface of the surrounding rock. It iterates and updates the coordinates of the points in the local spatial coordinate system stored in the control module and the geometric surfaces formed by the points at different spatial positions. The coordinates measured by the laser rangefinder array 6 in different local coordinate systems can be converted according to the movement trajectory of the origin of the laser rangefinder array 6 to obtain the coordinate values ​​of the tunnel surrounding rock surface in the same coordinate system, thus obtaining the geometric configuration of the tunnel surrounding rock.

[0035] This scheme measures the surface condition of the tunnel surrounding rock using a laser rangefinder array 6. Each laser rangefinder 4 acquires the corresponding distance value, which is then transmitted to a data acquisition unit via a data acquisition control board 1. The data acquisition unit then transmits and stores the data in the control module. The control module constructs a local spatial coordinate system for the tunnel surrounding rock based on the collected data. Simultaneously, it changes the initial position of the laser rangefinder array 6 and continuously acquires the surrounding rock morphology, continuously obtaining the distance from the laser rangefinder array 6 to the surrounding rock surface. It iterates and updates the coordinates of points in the local spatial coordinate system stored in the control module, as well as the geometric surfaces formed by these points at different spatial positions. The coordinates measured by the laser rangefinder array 6 in different local coordinate systems can be converted based on the movement trajectory of the origin of the laser rangefinder array 6 to obtain the coordinate values ​​of the tunnel surrounding rock surface in the same coordinate system, thus obtaining the three-dimensional geometric shape of the tunnel surrounding rock. This invention enables printing on non-planar areas such as tunnel surrounding rock, overcoming the limitations of traditional 3D printing technology in controlling and setting the initial base surface and printing rhythm, thus expanding the applicability of 3D printing. Furthermore, the device can combine 3D printing construction environment information with printing motion control by collecting and applying three-dimensional topographic information of the target printing construction area, achieving more objective planning of the printing motion path, enriching the control modes of printing motion, and improving the functional adaptability of 3D printing.

[0036] Cellular cells 3 are arranged in a rectangular array within a fixed frame. The fixed frame includes an odd number of rows and columns of cellular cells 3. The cross-sectional shape of the cellular cells 3 matches the shape of the laser rangefinder 4.

[0037] The axes of cell 3 are distributed radially. The axes of cells 3 located in the same row or column are located in the same plane. The planes containing the axes of cells 3 located in the middle row and the middle column are perpendicular to each other.

[0038] In this embodiment, there are 25 laser rangefinders 4, and the corresponding honeycomb holes 3 within the honeycomb fixing frame are arranged in a 5×5 rectangular array. The laser rangefinder array 6 measures the tunnel surrounding rock surface and obtains 25 distance values, denoted as l. 011 , l 012 , ..., l 015 , l 021 , l 022 , ..., l 055 A local spatial coordinate system O1 is constructed by using 25 distances from the same location pointing to the surrounding rock surface at different angles. At the same time, the 25 distance values ​​are converted into a geometric expression of the surrounding rock surface morphology and represented in the O1 coordinate system.

[0039] The laser rangefinder array 6 also includes a protective shell 5, which is used to protect the laser rangefinder 4, the honeycomb fixing frame and the acquisition control board 1. The acquisition control board 1 and the honeycomb fixing frame are both fixed inside the protective shell 5. The protective shell 5 is provided with through holes corresponding to the arrangement positions of the honeycomb 3.

[0040] The protective shell 5 is equipped with a connector, and the laser rangefinder array 6 can be detachably fixed to an external device via the connector.

[0041] The data acquisition unit is a high-frequency data acquisition microcontroller used to power the laser rangefinder array 6 and send data acquisition signals.

[0042] The data acquisition control board 1 includes a downlink port and an uplink port. The downlink port is connected to the laser rangefinder 4, and the uplink port is connected to the data acquisition unit.

[0043] The number of downlink and uplink ports on the acquisition control board 1 corresponds to the number of laser rangefinders 4 and the number of data acquisition units, respectively, serving as a transition for signal transmission.

[0044] The wires of the laser rangefinder 4 are led out through the bottom of the honeycomb 3 holes and connected to the downlink port of the acquisition control board 1; the protective shell 5 is provided with wire holes, and the wires connected to the uplink port of the acquisition control board 1 are connected to the data acquisition unit through the wiring holes.

[0045] The control module includes a data parsing and processing system and a disk array. The data parsing and processing system is used to construct a local coordinate system from the distance data measured by the laser rangefinder array 6, and to draw and characterize the geometric contours of the measured object surface in this coordinate system; the disk array is used to store the data.

[0046] The laser rangefinder array 6 is fixed on the motion support component, which is connected to the control module.

[0047] This solution fixes the laser rangefinder array 6 to a moving support component connected to the control module. After the laser rangefinder array 6 completes data acquisition at a certain position, the control module controls the moving support component to move, changing the initial position of the laser rangefinder array 6 and acquiring surface information of the object at different positions. This improves the automation and operability of the device. Simultaneously, the movement of the moving support component enhances the accuracy of the acquired data, resulting in a more precise 3D contour of the object's surface. It allows for the determination of the required amount of printing material within a surface area using one or more coordinate points, enabling refined and precise 3D printing motion control.

[0048] Before use, the laser rangefinder array 6 needs to be calibrated using auxiliary tools to obtain the initial coordinate system under standard conditions, especially the virtual position of the origin of the initial coordinate system.

[0049] This embodiment also provides calibration auxiliary tools and a specific calibration process. The calibration auxiliary tools include two mutually perpendicular planes, a calibration workbench, an inclinometer, and a total station. The two mutually perpendicular planes are arranged in an L-shape, with the horizontal plane denoted as the H-plane and the vertical plane as the G-plane. The G-plane can move back and forth on the H-plane. The calibration workbench consists of three height-adjustable legs and a 100cm × 70cm square plane, with a maximum leg height of 100cm.

[0050] For ease of description, the total station is denoted as Q, the rows of the laser rangefinder array are represented by m, and the columns by n; each rangefinder in the laser rangefinder array is denoted as a, and the laser rangefinder in the first row and first column is denoted as ai. 11 Similarly, the laser rangefinder in the first row and first column is denoted as a. mn The origin of the laser beam emitted by each laser rangefinder is marked as O. mn The total station records the coordinates of the laser rangefinder target point on plane G, marked as Q. mn .

[0051] Based on the above definitions, such as Figure 2-3 As shown, the specific calibration process is as follows:

[0052] (1) Place the calibration workbench on the H plane, place the inclinometer on the table of the calibration workbench, adjust the three support legs of the calibration workbench, and adjust the table of the calibration workbench to a horizontal state according to the inclinometer's indication.

[0053] (2) Place the laser rangefinder array on the workbench and keep its position unchanged during the calibration process;

[0054] (3) Set up the total station on the H plane and keep its position unchanged during the calibration process;

[0055] (4) Place the G surface at position A on the H surface, about 50cm away from the front end of the laser rangefinder array;

[0056] (5) Connect the power supply to each part of the device described in this invention to put the device system into standby mode;

[0057] (6) The device described in this invention is used to collect data from each laser rangefinder at position A on surface G. The distance between the laser rangefinder target point and surface G is denoted as a. mnA ;

[0058] (7) The coordinates of the laser rangefinder spot on plane G, acquired by the total station, are denoted as Q. mnA ;

[0059] (8) Place surface G at position B on surface H, approximately 100cm from the front face of the laser rangefinder array;

[0060] (9) The device described in this invention is used to collect data from each laser rangefinder at position B on surface G. The distance between the laser rangefinder target point and surface G is denoted as a. mnB ;

[0061] (10) The coordinates of the laser rangefinder spot on surface G, obtained by a total station, are denoted as Q. mnB ;

[0062] (11) Using a laser rangefinder a 33 For example, when surface G is at positions A and B, the distance values ​​collected by the laser rangefinder are a and a, respectively. 33A and a 33B The coordinates of the laser target point of the laser rangefinder in the Q field of view are Q... 33A and Q 33B In the coordinate system of Q, through Q 33A and Q 33B Calculate the laser rangefinder a 33 The direction of the emitted ray, with a 33A and a 33B The laser rangefinder a can be calculated separately. 33 The origin of the emitted ray O 33 After transforming all coordinates to the coordinates of the laser rangefinder a 33 exit origin O 33 In a coordinate system with O as the origin, records are also made using O. 33 Laser rangefinder a with coordinate origin 33 The direction of laser beam emission.

[0063] Similarly, calculate the origin and direction of the laser line emission for each laser rangefinder, and convert it to O. 33 In a coordinate system with the origin as the coordinate origin.

[0064] Based on the above calculations and analysis, the origin of the coordinates of all laser rangefinders in this device is O. 33 Complete the calibration of the device. The above process can be repeated to improve the accuracy of the calibration.

[0065] After calibration, the origin of the coordinate system is the laser rangefinder a. 33 The origin of the ray O 33 All distance values ​​measured by laser rangefinders can be considered as distance measured by laser rangefinder a. 33 The distance value was measured.

[0066] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A method for measuring three-dimensional geometric contours, characterized in that, The measurement components include a laser rangefinder array (6), a data acquisition unit, and a control module. The laser rangefinder array (6) includes a laser rangefinder (4), a honeycomb fixing frame (2), and a data acquisition control board (1). The honeycomb fixing frame (2) has a honeycomb-shaped interior. There are multiple laser rangefinders (4). The laser rangefinders (4) are fixed inside the honeycomb fixing frame (2). The laser rangefinders (4) are connected to the data acquisition control board (1). The data acquisition control board (1) is fixed at the bottom of the honeycomb fixing frame (2). The data acquisition control board (1) is connected to a data acquisition device. The data acquisition device is connected to a control module. The honeycomb fixing frame (2) is provided with multiple honeycombs (3), the honeycombs (3) are arranged in a rectangular array in the honeycomb fixing frame (2), the honeycomb fixing frame (2) includes honeycombs (3) with an odd number of rows and an odd number of columns, and the cross-sectional shape of the honeycomb (3) matches the shape of the laser rangefinder (4); The axes of the honeycomb (3) are radially distributed. The axes of the honeycomb (3) located in the same row or column are located on the same plane. The planes containing the axes of the honeycomb (3) located in the middle row and the middle column are perpendicular to each other. The measurement process of the measuring component includes the following steps: The surface condition of the tunnel surrounding rock is measured by a calibrated laser rangefinder array (6). Each laser rangefinder (4) acquires the corresponding distance value and transmits the measured distance value to the data acquisition unit through the acquisition control board (1). The data acquisition unit then transmits and stores the data in the control module. The control module constructs a local spatial coordinate system of the tunnel surrounding rock based on the collected data. The initial position of the laser rangefinder array (6) is changed, and the surrounding rock morphology is continuously collected. The distance from the laser rangefinder array (6) to the surrounding rock surface is continuously obtained. The coordinates of the points in the local spatial coordinate system stored in the control module and the geometric surfaces formed by the points at different spatial positions are iterated and updated. The coordinates measured by the laser rangefinder array (6) in different local coordinate systems are obtained. The coordinates of the tunnel surrounding rock surface in the same coordinate system are obtained by converting the coordinates based on the movement trajectory of the origin of the laser rangefinder array (6), and then the geometric configuration of the tunnel surrounding rock is obtained. The control module includes a data parsing and processing system and a disk array. The data parsing and processing system is used to construct a local coordinate system from the distance data measured by the laser rangefinder array (6), and to draw and characterize the geometric contour of the measured object surface in the coordinate system. The disk array is used to store the data. The laser rangefinder array (6) is fixed on the motion support component, which is connected to the control module; The calibration process of the laser rangefinder array includes the following steps: The calibration workbench is placed on plane H, and the surface of the calibration workbench is adjusted to be level; Place the laser rangefinder array on the calibration workbench and keep its position unchanged during the calibration process; Set up the total station on plane H and keep its position unchanged during calibration; Place surface G at position A on surface H, 50cm away from the front face of the laser rangefinder array; Turn on the power to all parts of the device to put the system into standby mode; The distance between the laser rangefinder target point and the target point on surface G, based on the data collected by each laser rangefinder at position A, is denoted as a. mnA ; The coordinates of the laser rangefinder spot on plane G, acquired by the total station, are denoted as Q. mnA ; Place surface G at position B on surface H, 100cm away from the front face of the laser rangefinder array; The distance between the laser rangefinder target point and the position B on surface G is denoted as a, based on the data collected by each laser rangefinder. mnB ; The coordinates of the laser rangefinder spot on plane G, obtained using a total station, are denoted as Q. mnB ; For the laser rangefinder a in row m and column n... mn When surface G is at positions A and B, the distance values ​​collected by the laser rangefinder are a and a, respectively. mnA and a mnB The coordinates of the laser target point of the laser rangefinder in the Q field of view are Q... mnA and Q mnB In the coordinate system of Q, through Q mnA and Q mnB Calculate the laser rangefinder a mn The direction of the emitted ray, with a mnA and a mnB The laser rangefinder a can be calculated separately. mn The origin of the emitted ray is 0. mn After transforming all coordinates to a laser rangefinder a mn Exit origin 0 mn In a coordinate system with the origin as the coordinate origin, records are also made with 0 as the origin. mn Laser rangefinder a with coordinate origin mn The direction of laser beam emission; Calculate the origin and direction of the laser line emitted by each laser rangefinder, and transform it into a coordinate system with the origin of the laser line emitted from the middle position of the middle row and the middle position of the middle column as the coordinate origin; Through calculation and analysis, the coordinate origin of all laser rangefinders is the origin of the laser ray emitted from the laser rangefinder located at the middle position of the middle row and the middle position of the middle column, thus completing the calibration of the device; In this array, the horizontal plane is denoted as H-plane, the vertical plane as G-plane, the total station as Q, the row of the laser rangefinder array as m, and the column as n; each rangefinder in the laser rangefinder array is denoted as a, and the laser rangefinder in the m-th row and n-th column is denoted as am. mn The origin of the laser beam emitted by each laser rangefinder is marked as 0. mn The coordinates of the laser rangefinder target point on plane G, recorded by the total station, are marked as Q. mn .

2. The method for measuring three-dimensional geometric contours according to claim 1, characterized in that, The laser rangefinder array (6) also includes a protective shell (5) for protecting the laser rangefinder (4), the honeycomb fixing frame (2) and the acquisition control board (1). The acquisition control board (1) and the honeycomb fixing frame (2) are both fixed inside the protective shell (5). The protective shell (5) is provided with through holes corresponding to the honeycomb (3) arrangement positions.

3. The method for measuring three-dimensional geometric contours according to claim 2, characterized in that, The protective shell (5) is provided with a connector, and the laser rangefinder array (6) can be detachably fixed to an external device through the connector.

4. The method for measuring three-dimensional geometric contours according to claim 2, characterized in that, The data acquisition unit is a high-frequency data acquisition microcontroller used to power the laser rangefinder array (6) and send data acquisition signals.

5. The three-dimensional geometric contour measurement method according to claim 4, characterized in that, The acquisition control board (1) includes a downlink port and an uplink port. The downlink port is connected to the laser rangefinder (4), and the uplink port is connected to the data acquisition unit.

6. The method for measuring three-dimensional geometric contours according to claim 5, characterized in that, The wire of the laser rangefinder (4) is led out through the bottom of the honeycomb (3) hole and connected to the downlink port of the acquisition control board (1); the protective shell (5) is provided with wire holes, and the wire connected to the uplink port of the acquisition control board (1) is connected to the data acquisition device through the wiring hole.

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