Measuring device

Abstract

This utility model discloses a measuring device, relating to the field of measurement technology. The measuring device includes a bracket, a laser rangefinder, and a reflector. The bracket includes a mounting base and a vertically extending column. The mounting base is slidably mounted on the column, and a scale is mounted on one side of the column. The laser rangefinder is mounted on the mounting base and is capable of emitting a laser beam that extends horizontally. The reflector includes a connected fixed base and a reflecting part. The fixed base is used to insert into the center hole of a vehicle wheel hub and has a circular hole for coaxial alignment with the center hole. The reflecting part includes a reflecting surface that coincides with one axial section of the circular hole. This measuring device can reduce the labor cost of measuring the external contour dimensions of vehicles and improves the efficiency and accuracy of measurement operations.

Description

Technical Field

[0001] This utility model relates to the field of measurement technology, and in particular to a measuring device. Background Technology

[0002] Currently, vehicle exterior dimensions are typically measured using a ruler and plumb bobs. For example, when measuring the front overhang length, plumb bobs are suspended at the very front of the vehicle and at the center of the front wheel hub, and marks are made on the ground. The distance between these marks is then measured using a ruler. This method is simple and easy to operate, but it usually requires two people to work together, is time-consuming, and errors are unavoidable during the plumb bob suspension, marking, and ruler measurement. Therefore, this traditional measurement method suffers from low efficiency and poor accuracy. Utility Model Content

[0003] The main purpose of this invention is to provide a measuring device that aims to improve the measurement efficiency and accuracy in the process of measuring the outer contour of a vehicle.

[0004] To achieve the above objectives, this utility model proposes a measuring device, comprising: The bracket includes a mounting base and a column extending in a vertical direction. The mounting base is slidably mounted on the column, and a scale is mounted on one side of the column in the vertical direction. A laser rangefinder, which is mounted on the mounting base and is capable of emitting a laser beam that extends horizontally; A reflector, comprising a connected mounting base and a reflective portion, wherein the mounting base is for insertion into a central hole of a vehicle wheel hub, the mounting base having a circular hole for coaxial arrangement with the central hole, and the reflective portion comprising a reflective surface that coincides with one of the axial sections of the circular hole.

[0005] In one embodiment, the mounting base includes a slider, a guide plate, and a fastening bolt. The column extends along the vertical direction and has a groove. A baffle is provided at the opening of the groove to block part of the opening. The slider is slidably mounted in the groove. The fastening bolt is threadedly engaged with both the slider and the guide plate. The fastening bolt passes through the guide plate and the opening in sequence and is connected to the slider. The fastening bolt is used to drive the slider and the guide plate closer together to clamp the baffle.

[0006] In one embodiment, the mounting base further includes a side plate, a first clamp, a second clamp, and a tail clamp. The guide plate is mounted on one side of the side plate, and the first clamp, the second clamp, and the tail clamp are all mounted on the other side of the side plate. The first clamp, the second clamp, and the tail clamp enclose a clamping space for accommodating the laser rangefinder. The laser rangefinder includes an opposing emitting end and a tail end. The emitting end is used to emit the laser beam, and the tail clamp abuts against the tail end.

[0007] In one embodiment, the first clamp has at least one first elongated hole extending along the vertical direction, and the side plate has at least one first fixing hole. The first elongated hole and the first fixing hole are arranged in a one-to-one correspondence, and the first elongated hole and the first fixing hole are bolted together.

[0008] In one embodiment, the tail clamp has at least one second elongated hole extending along the horizontal direction, and the side plate has at least one second fixing hole. The second elongated hole and the second fixing hole are arranged in a one-to-one correspondence, and the second elongated hole and the second fixing hole are bolted together.

[0009] In one embodiment, the support further includes a base, the column is connected to the top surface of the base, and the base is used to support the ground.

[0010] In one embodiment, the support further includes a counterweight that is connected to both the top surface of the base and the side surface of the column.

[0011] In one embodiment, the base includes a seat and wheels, the top surface of the seat is connected to the column, and the wheels are mounted on one side of the seat for walking on the ground.

[0012] In one embodiment, the reflective surface is coated with a diffuse reflection coating.

[0013] In one embodiment, the measuring device further includes a processor, which is communicatively connected to the laser rangefinder and is used to receive distance information detected by the laser rangefinder.

[0014] According to the technical solution of this utility model, the measuring device includes a bracket, a laser rangefinder, and a reflector. The bracket includes a mounting base and a column extending vertically. The mounting base is slidably mounted on the column, and a scale is mounted on one side of the column in the vertical direction. The laser rangefinder is mounted on the mounting base and is capable of emitting a laser beam that extends horizontally. The reflector includes a fixed base and a reflective part connected together. The fixed base is used to insert into the center hole of a vehicle wheel hub. The fixed base has a circular hole for being coaxial with the center hole. The reflective part includes a reflective surface that coincides with one of the axial sections of the circular hole. With this setup, when measuring the vehicle's height, the mounting base is moved along the column to the height of the vehicle's roof, and the laser beam scans the highest point of the vehicle's roof. The reading on the scale corresponding to the laser beam is then taken as the vehicle's height. When measuring the front overhang length, the mounting bracket is inserted into the center hole of the wheel hub, and the laser rangefinder measures a first distance from the laser rangefinder to the front of the vehicle and a second distance from the reflector. The front overhang length is obtained by subtracting the first distance from the second distance. Similarly, this invention can also measure the vehicle's length, width, wheelbase, and rear overhang length. Only one person is needed to operate the mounting base and reflector during the measurement process, making it efficient and fast. Furthermore, the use of laser ranging minimizes the impact of human intervention, thus improving measurement accuracy. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of an embodiment of the measuring device provided by this utility model; Figure 2 for Figure 1 A partial structural diagram from another perspective; Figure 3 for Figure 1 Another perspective on the partial structure; Figure 4 for Figure 2 Schematic diagram of the structure of the central reflector; Figure 5 for Figure 1 Enlarged structural diagram at point A; Figure 6 for Figure 2 A magnified structural diagram at point B in the middle.

[0017] Explanation of icon numbers: 1000. Measuring device; 1. Bracket; 11. Column; 111. Slide groove; 112. Baffle; 12. Mounting base; 121. Slider; 122. Guide plate; 123. Fastening bolt; 124. Side plate; 125. First clamping piece; 1251. First elongated hole; 126. Second clamping piece; 127. Tail clamping piece; 1271. Second elongated hole; 13. Scale; 14. Base; 141. Seat body; 142. Wheel; 15. Counterweight; 2. Laser rangefinder; 21. Transmitter; 22. Tail end; 3. Reflector; 31. Mounting base; 311. Circular hole; 32. Reflecting part; 321. Reflecting surface; X represents the horizontal direction; Y represents the vertical direction.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] In the field of vehicle manufacturing and inspection, the measurement and inspection of external contour dimensions is a crucial step in ensuring product quality. Currently, the traditional measurement methods commonly used in the industry mainly rely on basic tools such as rulers (or tape measures) and plumb bobs. Taking the measurement of the front overhang length of a vehicle as an example, technicians need to suspend plumb bobs at the most prominent position at the front of the vehicle and at the center point of the front wheel hub. After the plumb bobs are stable, they make clear marks on the contact points with the ground. Subsequently, a ruler is used to manually measure the straight-line distance between the two marked points. This process requires the measurement personnel to accurately identify the key measurement points of the vehicle and ensure that the plumb bobs are suspended vertically and the marking positions are accurate.

[0023] The applicant's observations revealed that this traditional measurement method typically requires two technicians working together. Each technician suspends a plumb bob at a measurement point and marks the ground (where adhesive tape is attached). The two technicians then measure the distance between the marks by pulling on either end of a ruler. This division of labor leads to inefficient human resource allocation. Furthermore, the stability of the suspended plumb bob is significantly affected by environmental factors; even slight air currents or uneven ground can cause it to shift. The accuracy of the ground markings relies on human judgment, and differences in the visual perception of different measurement personnel can lead to deviations in mark position. The accuracy of the ruler readings is limited by the measurement personnel's adherence to operating procedures. These factors combine to often result in systematic errors in the measurement results. A more significant problem is the lengthy measurement process; from suspending the plumb bob to final data recording, each step requires repeated calibration, making it difficult to improve overall work efficiency.

[0024] In view of this, the present invention proposes a measuring device to solve or at least alleviate the above-mentioned problems.

[0025] Please see Figures 1 to 4In one embodiment of this utility model, the measuring device 1000 includes a bracket 1, a laser rangefinder 2, and a reflector 3. The bracket 1 includes a mounting base 12 and a column 11 extending in the vertical direction Y. The mounting base 12 is slidably mounted on the column 11, extending in the vertical direction Y (see [reference]). Figure 1 (In the direction indicated by the middle arrow Y), a scale 13 is installed on one side of the column 11; the laser rangefinder 2 is mounted on the mounting base 12 and is capable of emitting a laser beam along the horizontal direction X (see...). Figure 1 (The direction indicated by the middle arrow X) extends; the reflector 3 includes a connected mounting base 31 and a reflector 32. The mounting base 31 is used to insert into the center hole of the vehicle hub. The mounting base 31 has a circular hole 311, which is coaxially arranged with the center hole. The reflector 32 includes a reflective surface 321, which coincides with one of the axial sections of the circular hole 311.

[0026] According to the technical solution of this embodiment, the measurement process of the vehicle's external dimensions (including length, width, height, wheelbase, front overhang length, and rear overhang length) is as follows: (1) Length measurement process: Place a measuring device 1000 on the front and rear sides of the vehicle body respectively. The distance between the two laser rangefinders 2 is L1. After adjusting the mounting base 12 to a suitable height, start the laser rangefinder 2 at the front of the vehicle body so that the laser beam is directed at the measuring point at the front of the vehicle body (the position of the measuring point needs to be determined according to the measurement requirements) to obtain the front side distance L2. Then the operator goes around to the rear side of the vehicle body and starts the laser rangefinder 2 at the rear of the vehicle body to obtain the rear side distance L3. At this time, the length of the vehicle can be calculated as: L1-(L2+L3).

[0027] (2) Width measurement process: Place a measuring device 1000 on the left and right sides of the vehicle body respectively. The distance between the two laser rangefinders 2 is L4. The operation steps are the same as in (1). Start the laser rangefinders 2 on the left and right sides of the vehicle body respectively to obtain the distance L5 on the left side and the distance L6 on the right side. At this time, the width of the vehicle can be calculated as: L4-(L5+L6).

[0028] (3) Height measurement process: Place a measuring device 1000 on either the left or right side of the vehicle body, start the laser rangefinder 2, and then push the mounting base 12 to drive the laser rangefinder 2 to slide up and down along the column 11 until the laser beam can just sweep over the highest point of the vehicle body. Record the reading on the scale 13 corresponding to the height of the laser beam at this time, which is the height of the vehicle.

[0029] (4) Wheelbase measurement process: Place a measuring device 1000 on the front side of the vehicle body. First, install the reflector 3 on the rear wheel hub of the vehicle (specifically, connect the mounting base 12 to the center hole of the wheel hub). After adjusting the laser rangefinder 2 to a suitable position, start the laser rangefinder 2 to obtain the distance L7 between the rear wheel hub and the laser rangefinder 2. Then, install the reflector 3 on the front wheel hub so that the laser rangefinder 2 can detect the distance L8 between the front wheel hub and the laser rangefinder 2. At this time, the wheelbase of the vehicle can be calculated as: L8-L7.

[0030] (5) Measurement process of front overhang length: Place a measuring device 1000 on the front side of the vehicle body, install the reflector 3 on the front wheel hub of the vehicle, adjust the laser rangefinder 2 to a suitable position, start the laser rangefinder 2, and obtain the distance L9 between the front wheel hub and the laser rangefinder 2. Then move the measuring device 1000 parallel to the left and right directions of the vehicle body so that the laser rangefinder 2 can measure the distance L10 between the front bumper of the vehicle and the laser rangefinder 2. At this time, the front overhang length of the vehicle can be calculated as: L9-L10.

[0031] (6) Measurement process of rear overhang length: A measuring device 1000 is placed on the rear side of the vehicle body and installed on the rear wheel hub of the vehicle through the reflector 3. The subsequent measurement process is the same as that described in (5). Finally, the distance L11 between the rear wheel hub and the laser rangefinder 2 and the distance L12 between the rear bumper and the laser rangefinder 2 are obtained. At this time, the rear overhang length of the vehicle can be calculated as: L11-L12.

[0032] The reflector 3 is entirely formed by 3D printing of nylon material, resulting in high overall strength and wear resistance. The dimensions of the mounting base 31 can be adjusted to suit different vehicle models. During installation, the outer wall of the mounting base 31 fits against the side wall of the center hole of the wheel hub. The bolt in the circular hole 311 of the mounting base 31 is fitted into the center hole of the wheel hub; this bolt connects the wheel hub to the axle. During measurement, the reflective surface 321 should be perpendicular to the laser beam to minimize measurement errors.

[0033] With the solution in this embodiment, only one person is needed to operate the mounting base 12 and the reflector 3 during the measurement of the vehicle's outer contour. The measurement process is efficient and fast, and the use of laser ranging reduces the impact of human operation on the measurement process, which helps to improve measurement accuracy.

[0034] In one embodiment of this utility model, please refer to Figure 3 and Figure 6The mounting base 12 includes a slider 121, a guide plate 122, and a fastening bolt 123. The column 11 extends vertically along the Y direction and has a groove 111. A baffle 112 is provided at the opening of the groove 111 to partially block the opening. The slider 121 is slidably mounted in the groove 111. The fastening bolt 123 is threadedly engaged with both the slider 121 and the guide plate 122. The fastening bolt 123 passes through the guide plate 122 and the opening sequentially to connect with the slider 121. The fastening bolt 123 is used to move the slider 121 and the guide plate 122 closer together to clamp them against the baffle 112. By providing the baffle 112, the groove 111 forms a "T" shaped groove, thereby preventing the slider 121 from coming out of the opening of the groove 111. When the mounting base 12 needs to be fixed at a certain height on the column 11, the fixing bolts need to be tightened to reduce the gap between the guide plate 122 and the slider 121. This allows the guide plate 122 and the slider 121 to be clamped onto the baffle 112 under the tension of the fixing bolts, thus ensuring that the mounting base 12 is stably held at a certain height on the column 11. This facilitates the operator's reading or adjustment of the angle and position of the reflector 3 near the vehicle. In addition, the nut of the fixing bolt has a flat tail for easy manual operation. The operator can rotate the fixing bolt by pinching the flat tail with their fingers and turning it, thereby clamping or loosening the baffle 112 between the slider 121 and the guide plate 122.

[0035] Furthermore, in one embodiment of this utility model, please refer to... Figure 5 and Figure 6 The mounting base 12 also includes a side plate 124, a first clamp 125, a second clamp 126, and a tail clamp 127. A guide plate 122 is mounted on one side of the side plate 124, and the first clamp 125, the second clamp 126, and the tail clamp 127 are all mounted on the other side of the side plate 124. The first clamp 125, the second clamp 126, and the tail clamp 127 enclose a clamping space for accommodating the laser rangefinder 2. The laser rangefinder 2 includes an opposing emitting end 21 and a tail end 22. The emitting end 21 is used to emit a laser beam, and the tail clamp 127 abuts against the tail end 22. The opposing sides of the first clamp 125 and the second clamp 126 are each provided with anti-hook grooves. After the laser rangefinder 2 is installed in the mounting base 12, part of the laser rangefinder 2 is accommodated in the anti-hook grooves to prevent the laser rangefinder 2 from falling out. Because the tail end 22 of the laser rangefinder 2 abuts against the tail clamp 127, the laser rangefinder 2 will not shift towards the tail end 22 due to vibration or external force after installation. This reduces the frequency of adjustments to the position of the laser rangefinder 2 by the operator, saving measurement time and improving measurement efficiency. This embodiment achieves detachable installation of the laser rangefinder 2 and the mounting base 12, facilitating maintenance and replacement of the laser rangefinder 2.

[0036] For further information, please continue reading. Figure 5In one embodiment of this utility model, the first clamping member 125 has at least one first elongated hole 1251 extending in the vertical direction Y. The side plate 124 has at least one first fixing hole, with the first elongated hole 1251 corresponding to the first fixing hole, and the first elongated hole 1251 is bolted to the first fixing hole. Thus, when the width of the laser rangefinder 2 used is different, the distance between the first clamping member 125 and the second clamping member 126 can be adjusted according to the width of the laser rangefinder 2. In specific operation, the operator first loosens the bolts used to fix the first clamping member 125, then moves the first clamping member 125 in the vertical direction Y, moving it closer to or away from the second clamping member 126 until the distance between the first clamping member 125 and the second clamping member 126 is suitable for clamping the laser rangefinder 2 in the clamping space. At this point, the bolts are tightened to fix the first clamping member 125 to the side plate 124. In this embodiment, there are two or more first elongated holes 1251, and all the first elongated holes 1251 are arranged in parallel so that the first elongated holes 1251 cooperate with the bolt to play a stable guiding role and avoid tilting or displacement during the movement of the first clamp 125.

[0037] In one embodiment of this utility model, please continue reading. Figure 5 The tail clamp 127 has at least one second elongated hole 1271 extending horizontally in the X direction. The side plate 124 has at least one second fixing hole, with the second elongated hole 1271 corresponding to the second fixing hole, and the second elongated hole 1271 is bolted to the second fixing hole. By adjusting the position of the tail clamp 127, the length of the clamping space can be changed, making the mounting base 12 suitable for mounting laser rangefinders 2 of different lengths. This avoids the laser rangefinder 2's emitting end 21 being exposed excessively outside the clamping space, thus preventing the cantilever portion of the laser rangefinder 2 from being too long. This helps ensure the horizontal extension of the laser beam and prevents the laser beam from shooting towards the ground. Specifically, during operation, the operator first loosens the bolts securing the tail clamp 127, then adjusts the position of the tail clamp 127 according to the length of the laser rangefinder 2 until the clamping space is long enough that, after installation, the cantilever portion of the laser rangefinder 2 is less than 20% of its total length. At this point, the bolts are tightened to fix the tail clamp 127 to the side plate 124. In this embodiment, there are two or more second elongated holes 1271, all arranged parallel to each other, so that the second elongated holes 1271 cooperate with the bolts to provide stable guidance and prevent tilting or displacement during the movement of the tail clamp 127. It should also be noted that in this embodiment, the tail clamp 127 includes a top plate, which abuts against the tail end 22 of the laser rangefinder 2 to increase the contact area between the tail clamp 127 and the laser rangefinder 2, thereby improving the stability of the laser rangefinder 2 installation.

[0038] Furthermore, in one embodiment, the nuts of the bolts used to fix the first clamp 125 and the tail clamp 127 are all provided with flat ends to facilitate the operator's rotation of the bolts. The connection between the second clamp 126 and the side plate 124 can be one of integral forming, welding, bonding, or bolting; the specific connection method can be selected according to design requirements. In one embodiment, the materials used to manufacture the guide plate 122, slider 121, side plate 124, first clamp 125, second clamp 126, and tail clamp 127 include one of carbon steel, stainless steel, nylon, polyoxymethylene, etc., and other rigid materials can also be selected as needed.

[0039] In one embodiment of this utility model, please refer to Figure 1 and Figure 2 The support frame 1 also includes a base 14, with the column 11 connected to the top surface of the base 14. The base 14 is used to support the ground. By setting the base 14, the center of gravity of the support frame 1 is lowered, improving its anti-overturning ability. During testing, the base 14 should be kept as close to the ground as possible to improve the stability of the support frame 1. In this embodiment, the connection between the column 11 and the base 14 includes either welding or bolting. Furthermore, the top surface of the base 14 is planar, and the column 11 is mounted perpendicular to the top surface of the base 14.

[0040] In one embodiment, leveling feet are installed around the base 14, and a bubble tube level is also installed on the first clamp 125 of the mounting base 12. By adjusting the leveling feet, the mounting base 12 can be made to be in a horizontal state, which helps to reduce errors in the measurement process.

[0041] In one embodiment of this utility model, please refer to Figure 1 and Figure 2 The support frame 1 also includes a counterweight 15, which is connected to both the top surface of the base 14 and the side surface of the column 11. The counterweight 15 is connected to both the column 11 and the base 14 via welding or bolting. The counterweight 15 is made of materials with high self-weight, such as carbon steel or cast iron. In this embodiment, the counterweight 15 is connected to both the column 11 and the base 14, providing support to the column 11 and reducing its sway due to external forces, thus improving its stability. Furthermore, the counterweight 15 helps maintain the center of gravity of the support frame 1 at its bottom and increases its overall mass, ensuring stable placement on the ground.

[0042] In one embodiment of this utility model, please refer to Figure 2The base 14 includes a seat body 141 and wheels 142. The top surface of the seat body 141 is connected to the column 11, and the wheels 142 are mounted on one side of the seat body 141 for walking on the ground. Specifically, in this embodiment, the wheels 142 are mounted on the rear side of the seat body 141. When it is necessary to move the measuring device 1000, simply rotate the bracket 1 to the rear, so that the wheels 142 support the ground, and the bracket 1 can be pushed to move. This improves the convenience of moving the measuring device 1000. In this embodiment, the wheels 142 are either directional wheels with brakes or omnidirectional wheels with brakes, so that the measuring device 1000 can stop in time after reaching the predetermined position.

[0043] In one embodiment of this invention, the reflective surface 321 is coated with a diffuse reflection coating. The diffuse reflection coating includes either matte white paint or matte gray paint, wherein the matte white paint, after being applied to the reflective layer, forms a Kodak white surface, and the matte gray paint, after being applied to the reflective layer, forms a Kodak gray surface. By providing a diffuse reflection layer, the laser beam entering the reflector 3 can form uniform diffuse reflection, so that the laser rangefinder 2 can receive a stable light signal at various angles, thereby improving the accuracy of distance measurement.

[0044] In one embodiment of this utility model, the measuring device 1000 further includes a processor, which is communicatively connected to the laser rangefinder 2. The processor is used to receive distance information detected by the laser rangefinder 2. The processor can be either a computer or a mobile device (such as a mobile phone), and the communication connection between the processor and the laser rangefinder 2 can be via Bluetooth, Wi-Fi, or a cable connection. This configuration eliminates the need for the operator to frequently bend over to read data from the laser rangefinder 2, thus improving the efficiency of the measurement operation.

[0045] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A measuring device, characterized in that include: The bracket includes a mounting base and a column extending in a vertical direction. The mounting base is slidably mounted on the column, and a scale is mounted on one side of the column in the vertical direction. A laser rangefinder, which is mounted on the mounting base and is capable of emitting a laser beam that extends horizontally; A reflector, comprising a connected mounting base and a reflective portion, wherein the mounting base is for insertion into a central hole of a vehicle wheel hub, the mounting base having a circular hole for coaxial arrangement with the central hole, and the reflective portion comprising a reflective surface that coincides with one of the axial sections of the circular hole.

2. The measuring device of claim 1, wherein, The mounting base includes a slider, a guide plate, and a fastening bolt. The column extends along the vertical direction and has a groove. A baffle is provided at the opening of the groove to block part of the opening. The slider is slidably mounted in the groove. The fastening bolt is threaded to both the slider and the guide plate. The fastening bolt passes through the guide plate and the opening in sequence and is connected to the slider. The fastening bolt is used to drive the slider and the guide plate to move closer to each other to clamp the baffle.

3. The measuring device as described in claim 2, characterized in that, The mounting base further includes a side plate, a first clamp, a second clamp, and a tail clamp. The guide plate is mounted on one side of the side plate, and the first clamp, the second clamp, and the tail clamp are all mounted on the other side of the side plate. The first clamp, the second clamp, and the tail clamp enclose a clamping space for accommodating the laser rangefinder. The laser rangefinder includes an opposing emitting end and a tail end. The emitting end is used to emit the laser beam, and the tail clamp abuts against the tail end.

4. The measuring device as described in claim 3, characterized in that, The first clamp has at least one first elongated hole, which extends along the vertical direction. The side plate has at least one first fixing hole, which corresponds to the first fixing hole. The first elongated hole is bolted to the first fixing hole.

5. The measuring device as described in claim 4, characterized in that, The tail clamp has at least one second elongated hole, which extends along the horizontal direction. The side plate has at least one second fixing hole, which corresponds to the second fixing hole. The second elongated hole and the second fixing hole are bolted together.

6. The measuring device according to any one of claims 1 to 5, characterized in that, The bracket also includes a base, the column is connected to the top surface of the base, and the base is used to support the ground.

7. The measuring device as described in claim 6, characterized in that, The support also includes a counterweight, which is connected to both the top surface of the base and the side surface of the column.

8. The measuring device as described in claim 6, characterized in that, The base includes a seat and wheels. The top surface of the seat is connected to the column, and the wheels are installed on one side of the seat and are used for walking on the ground.

9. The measuring device as described in any one of claims 1 to 5, characterized in that, The reflective surface is coated with a diffuse reflection coating.

10. The measuring device according to any one of claims 1 to 5, characterized in that, The measuring device further includes a processor, which is communicatively connected to the laser rangefinder and is used to receive distance information detected by the laser rangefinder.

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