Projection surveying apparatus and method for checking the flatness of an area or a specific elevation

Abstract

The application discloses a projection measuring device and method for checking regional flatness or specific elevation, relates to the technical field of construction machinery, and adopts a novel projection measuring device and cooperatively uses a corresponding measuring method; the projection measuring device comprises a control box, an adjustable high supporting leg, an inclination sensor, a rotating table, a guide rod, a platform, a elevation data receiving module, a lead screw, a first servo motor, a measuring table, a mounting hole, a laser emitting device, a power module and a control mechanism. The application can achieve intuitive, accurate, simple, high-automation, high-efficiency standards for the detection and control of the flatness of an airport pavement or the specific elevation control of a building structure, so that the flatness of the airport pavement can be conveniently and quickly detected, and the remote laser line can be used for elevation control when multiple people construct, the construction quality of the airport pavement and the building structure can be improved, and economic losses caused by large-area rework can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of construction machinery, in particular to a projection measuring device and method for checking regional flatness or specific elevation. BACKGROUND

[0002] At present, the common elevation control measures are: applying a level to measure and lay out an elevation control point in advance, setting an elevation control pile or measuring control in real time, which are all closely coordinated by the site construction personnel and the survey personnel. In the implementation process, it mainly relies on manual intermittent measurement control, which is inconvenient to check, and when large-area construction is carried out, it is easy to have low work efficiency, low control precision of elevation or flatness, and other quality problems, which will cause entity quality hidden troubles of the project, and some serious problems will restrict the subsequent construction and even cause large-area rework.

[0003] The traditional method for detecting the flatness of the airport pavement is: one is to place a three-meter ruler on the road surface to be detected, and then find the maximum gap between the three-meter ruler and the road surface, and analyze the flatness of the road surface from the size of the gap. This detection method has simple structure, but slow measurement speed, time-consuming and labor-intensive, and requires a large amount of manual labor. Another common flatness detection device is based on the distance between the vehicle body and the main shaft of the vehicle, which will change with the unevenness of the road surface. This measuring device is called jounce accumulation method.

[0004] Because the mechanical properties of the vehicle will change over time, and the flatness index is also affected by the mechanical properties of the vehicle and the vehicle speed, it is difficult to ensure the measurement accuracy. A multi-functional road condition rapid detection system CiCS has appeared in the prior art. This method requires personnel with professional training to go through a complex equipment calibration process, and can only be detected by specific vehicle equipment, resulting in high detection cost and low efficiency.

[0005] In summary, there is still a lack of equipment for detecting the flatness of the airport pavement or controlling the specific elevation of the building structure, which is intuitive, accurate, simple to operate, highly automated, and has high detection and control efficiency. Therefore, it is necessary to improve the existing technology. SUMMARY

[0006] To solve the problems of the prior art, the purpose of the present application is to provide a projection measuring device for checking regional flatness or specific elevation, which can achieve the standards of being intuitive, accurate, simple to operate, highly automated, and having high detection and control efficiency for detecting the flatness of the airport pavement or controlling the specific elevation of the building structure, and is suitable for popularization and use.

[0007] In order to achieve the above-mentioned purpose and solve the above-mentioned problems, the technical scheme adopted by the present application is:

[0008] The application relates to a projection measuring device for checking the flatness of a region or a specific height, which comprises a control box, adjustable high supporting legs arranged at the bottom end of the control box, an inclination sensor arranged on the control box, a rotating table coaxially arranged at the top end of the control box, two guide rods symmetrically arranged at the top end of the rotating table relative to the axis of the rotating table, a platform fixedly connected to the top ends of the two guide rods, a GPS or Beidou base station elevation data receiving module arranged at the top end of the platform, a lead screw, a first servo motor arranged at the center of the lower surface of the platform, wherein the output shaft of the first servo motor extends downward in the longitudinal direction and is fixedly connected to the top end of the lead screw, the bottom end of the lead screw extends downward in the longitudinal direction and is rotationally connected to the top end of the rotating table, a measuring table is screwed on the lead screw, the two guide rods respectively penetrate the measuring table and are slidably connected to the measuring table, the measuring table is a cylindrical structure coaxial with the control box, one or a plurality of mounting holes are arranged on the side wall of the measuring table, a laser emitting device is arranged in each mounting hole, the laser emitting device emits a laser line in the vertical plane of the measuring table in the radial direction through the driving of a second servo motor, a power module and a control mechanism are arranged in the control box and are electrically connected to each other, the control mechanism is signal-connected to the inclination sensor and the elevation data receiving module through wires and is electrically connected to the adjustable high supporting legs, the first servo motor, the second servo motor, the laser emitting device and the driving mechanism of the rotating table through wires.

[0009] Preferably, one end of the second servo motor is fixedly connected to the side wall of the mounting hole, the output shaft end of the second servo motor is fixedly connected to the side wall of the laser emitting device, and the other side wall of the laser emitting device is rotationally connected to the other side wall of the mounting hole. Under the driving of the second servo motor, the laser line emitted by the laser emitting device is adjusted in angle in the vertical plane of the measuring table in the radial direction.

[0010] Preferably, the control box is also a cylindrical structure, a third servo motor is arranged at the center in the control box, the output shaft of the third servo motor rotationally penetrates the top end of the control box and is fixedly connected to the center of the lower surface of the rotating table, an annular slide block is coaxially arranged at the lower end of the rotating table, an annular slide groove is coaxially arranged at the top end of the control box, the annular slide block is accommodated in the annular slide groove and is slidably connected to the annular slide groove, and the third servo motor is electrically connected to the control mechanism.

[0011] Preferably, a high-definition camera is further arranged on the top of the rotating table above the mounting hole, and the high-definition camera is electrically connected to the control mechanism through wires.

[0012] Preferably, a handle-shaped invisible antenna is arranged at the top end of the elevation data receiving module.

[0013] Preferably, the adjustable high supporting leg is an electric telescopic device, the top end of the electric telescopic device is fixedly connected with the bottom end of the control box, the bottom end of the electric telescopic device is connected with a cushion plate, and the electric telescopic device is electrically connected with the control mechanism.

[0014] Preferably, the control box is further provided with a wireless signal receiving device, the wireless signal receiving device is electrically connected with the control mechanism and is used in cooperation with a remote controller.

[0015] Preferably, the control mechanism is further connected with a man-machine interaction device through a wire.

[0016] Another object of the present application is to provide a method for rechecking the regional flatness of an airport runway.

[0017] In order to achieve the above objects, the present application adopts the following technical scheme:

[0018] A method for rechecking the regional flatness of an airport runway comprises the following steps:

[0019] A1, a projection measuring device for rechecking the regional flatness or a specific elevation is placed in the middle of a runway to be detected, parameters are input through a man-machine interaction device, the parameters include a minimum angle and a maximum angle between a laser line emitted by a laser emitting device and an axis of a measuring table, and a single rotation angle of the laser line between the minimum angle and the maximum angle, the laser line is rotated to the maximum angle position through the single rotation angle from the minimum angle;

[0020] A2, a start button is pressed, the control mechanism adjusts the adjustable high supporting leg according to the signal of the inclination sensor until the control box is adjusted to be horizontal or has the same inclination as the runway, the laser emitting device is rotated to the initial angle through the control of the second servo motor, the laser emitting device is turned on, the angle between the light emitted by the laser emitting device and the axis of the measuring table is the minimum angle, then the control mechanism drives the measuring table to rotate through the third servo motor, a high-definition camera records the rotation track of the projection point of the laser line on the runway, the control mechanism analyzes the recorded projection point track according to the set program, when the track is a smooth arc curve or an elliptical curve or a circular curve, it represents that the runway is in a standard flat state within the range of the projection point track at the minimum angle position, if there is a concave line on the arc curve or the elliptical curve or the circular curve, it represents that there is a protrusion at the position of the concave line, if there is a convex line on the arc curve or the elliptical curve or the circular curve, it represents that there is a pit at the position of the convex line, the control mechanism records the number of the concave line and the convex line as the data for evaluating the flatness of the runway, and draws the rotation track of the projection point at the minimum angle into a graph.

[0021] A3, according to the minimum angle at the measuring method, the control mechanism controls the second servo motor to rotate the laser line according to the set single rotation angle in turn, when the laser line rotates to a new angle, the above process of detecting the flatness of the pavement is repeated, that is, the third servo motor drives the measuring table to rotate, the control mechanism judges whether the pavement in the trajectory range of the projection point of the laser line is in the standard flat state, if there is a concave line or a convex line, the number of the concave line and the convex line is recorded, and a graph is drawn; the above operation is repeated until the flatness detection of the pavement at the maximum angle is completed;

[0022] A4, the control mechanism evaluates the flatness of the pavement according to the pre-set flatness evaluation standard combined with the data of the concave line and the convex line on the moving trajectory of the projection point at each angle, and issues a data table of the concave line and the convex line at each angle, and gives the overall graph in the detection range.

[0023] Another object of the present application is to provide a specific elevation control method.

[0024] In order to achieve the above object, the technical scheme adopted by the present application is:

[0025] The specific elevation control method comprises the following steps:

[0026] B1, the projection measuring device for reviewing the flatness of the region or the specific elevation is placed at the opposite side of the structure to be controlled or at the center of several structures to be controlled, the elevation of the structure to be controlled is input through the man-machine interaction device, the starting button is pressed, the control mechanism adjusts the adjustable high support foot according to the signal of the inclination sensor until it is adjusted to the horizontal state;

[0027] B2, the control mechanism determines the elevation of the position where the elevation data receiving module is located through the data received by the elevation data receiving module, and moves the measuring table from the starting position to the position of the control structure through the first servo motor, at the position of the control structure, the horizontal laser line emitted by the laser emitting device has the same height as the elevation of the structure; in this process, the control mechanism determines the distance of the movement of the measuring table through the number of revolutions of the first servo motor and the pitch of the lead screw;

[0028] B3, when the measuring table moves to the position of the control structure, the second servo motor rotates and makes the laser emitting line at the horizontal angle;

[0029] B4, the measuring personnel stand beside the structure, control the third servo motor to drive the measuring table to rotate through the remote controller, and detect the elevation of the structure through the laser line in the rotating process.

[0030] The projection measurement device of this invention for verifying the flatness of a region or a specific elevation has the following beneficial effects: This invention can achieve intuitive, accurate, simple operation, high degree of automation, and high detection and control efficiency for airport pavement flatness detection or specific elevation control of building structures. It can conveniently and quickly detect the flatness of airport pavement and can remotely control the laser line for elevation control when multiple people are working. It can improve the construction quality of airport pavement and building structures and avoid the economic losses caused by large-scale rework. Attached Figure Description

[0031] Figure 1 A top view of the cross-sectional structure of the present invention;

[0032] Figure 2 A front view schematic diagram of the present invention;

[0033] Figure 3 A schematic diagram of an embodiment of the present invention equipped with a high-definition camera;

[0034] Figure 4 A partial structural diagram of point A in this invention;

[0035] Figure 5 A top view of the principle of airport pavement smoothness detection in this invention;

[0036] Figure 6 A schematic diagram illustrating the principle of forming a concave line by the laser line projection trajectory in this invention;

[0037] Figure 7 A schematic diagram illustrating the principle of forming an outwardly convex line by the laser line projection trajectory of this invention;

[0038] Figure 8 A schematic diagram of the angle between the laser line and the axis of the measuring stage in this invention;

[0039] 1: Control box; 2: Adjustable height support foot; 3: Foot pad; 4: Third servo motor; 5: Power module; 6: Control mechanism; 7: Tilt sensor; 8: Rotary table; 9: Annular groove; 10: Annular slider; 11: Guide rod; 12: Lead screw; 13: Platform; 14: First servo motor; 15: Elevation data receiving module; 16: Handle-shaped stealth antenna; 17: High-definition camera; 18: Mounting hole; 19: Laser emitting device; 20: Second servo motor; 21: ... 21: First projection point; 22: Second projection point; 23: Smooth curve; 24: Laser line at a certain angle; 25: Laser line at another angle; 26: Line segment with concave line; 27: Concave line; 28: Convex line; 29: Measuring platform; 30: Expected projection point; 31: Actual projection point; 32: Protrusion; 33: Pits; 34: Laser line at one angle; 35: Pavement; 36: Minimum included angle; 37: Maximum included angle; 38: Measuring platform axis; 39: Single rotation angle. Detailed Implementation

[0040] The following description provides a detailed explanation of the embodiments of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0041] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for 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 a specific orientational structure and operation. Therefore, they should not be construed as limiting this invention.

[0042] Example 1, such as Figures 1-4 As shown:

[0043] Projection measurement equipment for verifying the flatness or specific elevation of an area includes a control box 1, an adjustable support foot 2 at the bottom of the control box 1, an inclination sensor 7 on the control box, a rotating platform 8 coaxially mounted on the top of the control box, two guide rods 11 mounted on the top of the rotating platform 8 and symmetrical about the axis of the rotating platform 8, a platform 13 fixedly connected to the top of the two guide rods 11, a GPS or Beidou base station elevation data receiving module 15 mounted on the top of the platform, and a lead screw 12. The number of guide rods can be three, four, or more as needed or to make the platform more stable.

[0044] A first servo motor 14 is provided at the center of the lower surface of the platform 13. The output shaft of the first servo motor 14 extends longitudinally downward and is fixedly connected to the top end of the lead screw 12. The bottom end of the lead screw extends longitudinally downward and is rotatably connected to the top end of the rotating table 8. A measuring table 29 is screwed onto the lead screw. Two guide rods pass through the measuring table and are slidably connected to the measuring table. As needed, the driving mechanism for driving the measuring table up and down in this invention can also be other driving mechanisms that can achieve this function. In this case, it should be considered as an equivalent replacement.

[0045] The measuring platform 29 is a cylindrical structure coaxial with the control box 1. One mounting hole 18 or several evenly distributed holes 18 are provided on the side wall of the measuring platform, and laser emitting devices 19 are respectively installed in the mounting holes. The laser emitting devices 19 emit laser lines within the vertical plane radially connected to the measuring platform 29, driven by the second servo motor 20. Figures 1-5 The embodiments with several mounting holes are shown in the figures. It should be noted that the simplest embodiment of the present invention is to provide one mounting hole.

[0046] The control box 1 contains a power module 5 and a control mechanism 6 that are electrically connected to each other. The control mechanism 6 is connected to the tilt sensor 7 and the elevation data receiving module 15 via wires, and is also electrically connected to the adjustable height support foot 2, the first servo motor 14, the second servo motor 20, the laser emitting device 19, and the drive mechanism of the rotating table via wires.

[0047] Example 2: This example is further improved as follows:

[0048] like Figure 4 As shown, one end of the second servo motor 20 is fixedly connected to the side wall of the mounting hole 18, and the output shaft end of the second servo motor 20 is fixedly connected to the side wall of the laser emitting device 19. The other side wall of the laser emitting device is rotatably connected to the other side wall of the mounting hole. Driven by the second servo motor 20, the laser line emitted by the laser emitting device 19 adjusts its angle within the vertical plane of the radial direction of the measuring table.

[0049] like Figure 1-3 As shown, the control box 1 is also a cylindrical structure. A third servo motor 4 is provided at the center of the control box 1. The output shaft of the third servo motor 4 rotatably passes through the top of the control box 1 and is fixedly connected to the center of the lower surface of the rotating platform 8. An annular slider 10 is coaxially provided at the lower end of the rotating platform 8. An annular groove 9 is coaxially provided at the top of the control box 1. The annular slider is housed in the annular groove and is slidably connected to the annular groove. The third servo motor 4 is electrically connected to the control mechanism.

[0050] like Figure 3 As shown, a high-definition camera 17 is also provided on the top of the rotating platform above the mounting hole 18. The high-definition camera 17 is electrically connected to the control mechanism via a wire.

[0051] Example 3: This example is further improved as follows:

[0052] like Figure 1 As shown, the elevation data receiving module is equipped with a handle-shaped invisible antenna 16 at its top.

[0053] like Figure 1 As shown, the adjustable height support foot 2 is an electric telescopic device (such as an electric cylinder). The top end of the electric telescopic device is fixedly connected to the bottom end of the control box 1, and the bottom end of the electric telescopic device is connected to a foot plate 3. The electric telescopic device is electrically connected to the control mechanism.

[0054] like Figures 1-4 As shown, the control box 1 is also equipped with a wireless signal receiving device (not shown in the figure). The wireless signal receiving device is electrically connected to the control mechanism and is used in conjunction with a remote control (not shown in the figure).

[0055] like Figures 1-4 As shown, the control mechanism is also connected to a human-machine interface device (not shown in the figure) via a wire.

[0056] Example 4, this example is further disclosed as follows:

[0057] The method for verifying the smoothness of airport pavement areas includes the following steps:

[0058] A1. Place the projection measurement device used for verifying the flatness of the area or a specific elevation in the center of the pavement to be inspected (i.e., the center of the road, so that the pavement flatness can be newly inspected by laser when rotating, thus increasing the inspection range; of course, it can also be placed on the side of the road, in which case the inspection range is smaller). Input parameters through the human-machine interface device. The parameters include the minimum angle 36 and the maximum angle 37 between the laser line emitted by the laser emitter and the axis 38 of the measuring platform (e.g., ...). Figure 8 As shown, the laser line is closest to the projection point of the track surface 35 when the angle is smallest, and the projection point is farthest from the device when the angle is largest. It also includes the single rotation angle 39 of the laser line between the smallest angle and the largest angle (the single rotation angle can be a uniform data or each single rotation angle can be set separately). The laser line starts from the smallest angle and rotates to the position of the largest angle after several single rotation angles.

[0059] A2, Press the start button. The control mechanism adjusts the adjustable support foot 2 according to the signal from the tilt sensor 7 until the control box 1 is adjusted to be horizontal or at the same tilt angle as the track surface (some track surfaces are designed with a certain tilt angle; adjusting the tilt angle of the control box to be the same as the track surface tilt angle facilitates the formation of a circular trajectory when the laser line rotates on the track surface projection point. On inclined tracks, when the device is adjusted to be horizontal, the rotation trajectory of the projection point on the track surface becomes elliptical). By controlling the second servo motor 20, the laser emitting device 19 is rotated to the initial angle, and the laser emitting device is turned on. The angle between the light emitted by the laser emitting device and the axis 38 of the measuring platform is the minimum angle. Then, the control mechanism drives the measuring platform 29 to rotate via the third servo motor 4. Figure 5 As shown, the high-definition camera 17 records the rotation trajectory of the laser line and the projection point on the pavement. The control mechanism analyzes the recorded projection point trajectory according to the set program. When the trajectory is a smooth arc, ellipse, or circle, it indicates that the pavement is in a standard flat state within the trajectory range of the projection point at the position of the minimum angle. If an indentation line 27 appears on the arc, ellipse, or circle, such as... Figure 6 As shown, this indicates that the location of the concave line is blocked by a protrusion 32, such as... Figure 5 As shown, if an arc-shaped curve, elliptical curve, or circular curve has an outwardly convex line 28, such as... Figure 7As shown, this indicates the presence of a pit 33 at the location of the convex line. The control mechanism records the number of concave lines 27 and convex lines 28 as data for evaluating pavement smoothness, and plots the rotation trajectory of the projection point at the minimum angle as a graphic, such as... Figure 5 As shown; Figure 6 As shown, when there is a protrusion 32, the expected projection point 30 of the laser line is blocked by the protrusion 32, forming the actual projection point 31. The actual projection point 31 is closer to the device. Therefore, in the captured trajectory pattern, a concave line 27 appears at the part with the protrusion. Similarly, as... Figure 7 As shown, the expected projection point 30 of the laser line did not form due to the presence of a pit, and the actual projection point 31 appeared instead. The actual projection point 31 is farther away from the device. Therefore, in the trajectory pattern captured, the part with the protrusion appears as an outward convex line 28. The detection of pavement smoothness is actually to detect the protrusions and pits on the pavement. The number of protrusions and pits can be calculated by identifying the inward concave lines and outward convex lines.

[0060] A3, based on the measurement method at the minimum included angle, such as Figure 5 , 8 As shown, the control mechanism controls the second servo motor 20 to rotate the laser line sequentially according to the set single rotation angle 39. When the laser line rotates to a new angle, the above process of detecting the pavement smoothness is repeated, that is, the third servo motor 4 drives the measuring table 29 to rotate. The control mechanism judges whether the pavement is in a standard smooth state within the trajectory range of the laser line's projection point on the pavement. If there are concave lines or convex lines, the number of concave lines and convex lines is recorded and drawn into a graph. The above operation is repeated until the pavement smoothness detection at the maximum included angle is completed. It should be noted that when there is only one laser emitting device, the device located in the center of the pavement needs to make the measuring table rotate one revolution. When there are several laser emitting devices, the angle of rotation of the measuring table is the included angle between adjacent laser emitting devices.

[0061] A4. The control mechanism evaluates the pavement smoothness based on pre-set smoothness assessment standards and the data of concave and convex lines on the movement trajectory of projection points at each included angle. For example, a total of more than 100 concave and convex lines is considered unqualified, or separate criteria are set for concave lines exceeding 100 and convex lines exceeding 100. A data table of concave and convex lines at each included angle is generated, along with a graphical representation of the overall inspection range. Figure 5 Only a portion of the overall image is shown; it should be understood that as the detection progresses, Figure 5 The trajectory of the projection points should continuously increase, and the projection points should spread outwards sequentially.

[0062] Example 5: Based on the above examples, this example discloses:

[0063] Elevation control methods for specific elevations include the following steps:

[0064] B1. Place the projection measurement device used to verify the flatness of the area or a specific elevation on the opposite side of the structure to be controlled or at the center of several structures to be controlled (if the structure under construction is a ring structure, it can be placed in the center to facilitate the control of the elevation of the surrounding structures; if it is a single structure such as a single wall, it can be placed on the opposite side). Input the elevation of the structure to be controlled through the human-machine interface device, press the start button, and the control mechanism adjusts the adjustable support feet according to the signal of the tilt sensor until it is adjusted to a horizontal state.

[0065] B2. The control mechanism determines the elevation of the elevation data receiving module's location using data received from the elevation data receiving module. It then moves the measuring platform 29 from its starting position (which is pre-set, meaning the platform's height is known) to the controlled structural elevation position using the first servo motor 14. At this controlled structural elevation position, the horizontal laser line emitted by the laser emitting device has the same height as the structural elevation. During this process, the control mechanism determines the distance the measuring platform moves using the rotation speed of the first servo motor and the lead screw pitch. In other words, the structural elevation position is the elevation of the location of the elevation data receiving module minus the distance between the measuring platform and the elevation data receiving module when the platform reaches the controlled structural elevation position. This calculation is performed using a preset program of the control mechanism.

[0066] B3, when the measuring stage moves to the position of the control structure elevation, the second servo motor rotates and makes the laser emission line at a horizontal angle;

[0067] B4. The surveyor stands beside the structure and uses a remote control to control the third servo motor to rotate the measuring platform. During rotation, a laser line is used to detect the elevation of the structure. In multi-person construction projects, each worker can be equipped with a remote control. Each worker can use their own remote to rotate the laser line to their assigned section of the structure for elevation detection, thus achieving structural elevation control even with multiple workers on site.

Claims

1. A projection measurement device used for verifying the flatness of an area or a specific elevation, characterized by: Includes a control box, an adjustable support foot at the bottom of the control box, an tilt sensor on the control box, a rotating platform coaxially mounted on the top of the control box, two guide rods mounted on the top of the rotating platform and symmetrical about the axis of the rotating platform, a platform fixedly connected to the top of the two guide rods, a GPS or Beidou base station elevation data receiving module mounted on the top of the platform, and a lead screw. A first servo motor is provided at the center of the lower surface of the platform. The output shaft of the first servo motor extends downward in the longitudinal direction and is fixedly connected to the top end of the lead screw. The bottom end of the lead screw extends downward in the longitudinal direction and is rotatably connected to the top end of the rotating table. A measuring platform is screwed onto the lead screw, and two guide rods pass through the measuring platform and are slidably connected to it. The measuring platform is a cylindrical structure coaxial with the control box, and one or several mounting holes are provided on the side wall of the measuring platform, or evenly distributed around the axis. Each of the mounting holes is equipped with a laser emitting device, which emits a laser line within the vertical plane of the measuring table's radial direction via a second servo motor. The control box contains a power module and a control mechanism that are electrically connected to each other. The control mechanism is connected to the tilt sensor and the elevation data receiving module via wires, and is also electrically connected to the drive mechanism of the adjustable height support foot, the first servo motor, the second servo motor, the laser emitting device, and the rotating table via wires. One end of the second servo motor is fixedly connected to the side wall of the mounting hole, and the end of the output shaft of the second servo motor is fixedly connected to the side wall of the laser emitting device. The other side wall of the laser emitting device is rotatably connected to the other side wall of the mounting hole. Driven by the second servo motor, the laser line emitted by the laser emitting device adjusts its angle within the vertical plane of the radial direction of the measuring platform. The control box is also a cylindrical structure. A third servo motor is provided at the center of the control box. The output shaft of the third servo motor rotatably passes through the top of the control box and is fixedly connected to the center of the lower surface of the rotating platform. The lower end of the rotating platform is coaxially provided with an annular slider. The top of the control box is coaxially provided with an annular groove. The annular slider is accommodated in the annular groove and slidably connected to the annular groove. The third servo motor is electrically connected to the control mechanism. The third servo motor drives the measuring platform to rotate, and the control mechanism judges whether the pavement is in a standard flat state within the trajectory range of the laser line projection point on the pavement.

2. The projection measurement device for verifying the flatness or specific elevation of an area as described in claim 1, characterized in that: A high-definition camera is also installed on the top of the rotating platform above the mounting hole. The high-definition camera is electrically connected to the control mechanism via a wire.

3. The projection measurement device for verifying the flatness or specific elevation of an area as described in claim 2, characterized in that: The elevation data receiving module is equipped with a handle-shaped invisible antenna at its top.

4. The projection measurement device for verifying the flatness or specific elevation of an area as described in claim 3, characterized in that: The adjustable height support foot is an electric telescopic device. The top of the electric telescopic device is fixedly connected to the bottom of the control box, and a foot pad is connected to the bottom of the electric telescopic device. The electric telescopic device is electrically connected to the control mechanism.

5. The projection measurement device for verifying the flatness or specific elevation of an area as described in claim 4, characterized in that: The control box is also equipped with a wireless signal receiver, which is electrically connected to the control mechanism and used in conjunction with a remote control.

6. The projection measurement device for verifying the flatness or specific elevation of an area as described in claim 5, characterized in that: The control mechanism is also connected to a human-machine interface device via wires.

7. A method for verifying the smoothness of an airport pavement area, characterized by employing the projection measurement device described in claim 6 for verifying the smoothness of an area or a specific elevation, specifically comprising the following steps: A1. Place the projection measurement device used to verify the flatness of the area or a specific elevation in the middle of the pavement to be inspected. Input parameters through the human-computer interaction device. The parameters include the minimum and maximum angles between the laser line emitted by the laser emitting device and the axis of the measuring table, as well as the single rotation angle of the laser line between the minimum and maximum angles. The laser line starts from the minimum angle and rotates to the maximum angle position after passing through several single rotation angles. A2. Press the start button. The control mechanism adjusts the adjustable support feet based on the signal from the tilt sensor until the control box is level or at the same tilt angle as the pavement. Then, the second servo motor rotates the laser emitter to its initial angle, activating the laser emitter. The angle between the emitted laser beam and the axis of the measuring platform is at its minimum. Next, the control mechanism uses the third servo motor to rotate the measuring platform. A high-definition camera captures and records the rotation trajectory of the laser beam and the projection point on the pavement. The control mechanism then processes the captured projection point trajectory according to the pre-programmed settings. Analysis shows that when the trajectory is a smooth arc, ellipse, or circular curve, it indicates that the pavement is in a standard flat state within the trajectory range of the projection point at the minimum angle. If an inward concave line appears on the arc, ellipse, or circular curve, it indicates that there is a protrusion blocking the location of the inward concave line. If an outward convex line appears on the arc, ellipse, or circular curve, it indicates that there is a pit at the location of the outward convex line. The control mechanism records the number of inward and outward convex lines as data for evaluating the pavement flatness and draws the rotation trajectory of the projection point at the minimum angle into a graph. A3. Based on the measurement method at the minimum included angle, the control mechanism controls the second servo motor to rotate the laser line sequentially according to the set single rotation angle. When the laser line rotates to a new angle, the process of detecting the pavement smoothness in step A2 is repeated. If there are concave lines or convex lines, the number of concave lines and convex lines is recorded and a graph is drawn. The above operation is repeated until the pavement smoothness detection at the maximum included angle is completed. A4. The control mechanism evaluates the pavement smoothness based on the pre-set smoothness evaluation standards and the data of the concave and convex lines on the movement trajectory of the projection points at each angle. It also generates a data table of the concave and convex lines at each angle and provides an overall graphic of the detection range.

8. A method for controlling elevation at a specific elevation, characterized by: The projection measurement device for verifying the flatness or specific elevation of a region as described in claim 6 specifically includes the following steps: B1. Place the projection measurement device used to verify the flatness of the area or a specific elevation on the opposite side of the structure to be controlled or at the center of several structures to be controlled. Input the elevation of the structure to be controlled through the human-machine interface device, press the start button, and the control mechanism adjusts the adjustable support feet according to the signal of the tilt sensor until it is adjusted to a horizontal state. B2, the control mechanism determines the elevation of the location of the elevation data receiving module by receiving data from the elevation data receiving module, and moves the measuring platform from the starting position to the position of the control structure elevation by the first servo motor. At the position of the control structure elevation, the horizontal laser line emitted by the laser emitting device has the same height as the elevation of the structure. During this process, the control mechanism determines the distance the measuring platform moves by the number of revolutions of the first servo motor and the pitch of the lead screw. B3, when the measuring stage moves to the position of the control structure elevation, the second servo motor rotates and makes the laser emission line at a horizontal angle; B4. The surveyor stands next to the structure and uses a remote control to control the third servo motor to rotate the measuring platform. During the rotation, the elevation of the structure is detected by a laser line.

Images