[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, but not all of them.
[0032] see also Figure 1-6 An embodiment of the invention provides a three-dimensional imaging device for engineering project planning, which comprises a rail flat car base 1, two sides of the rail flat car base 1 are provided with four rail wheels, an electrical box 3 is installed below the front end of the rail flat car base 1, a support frame 5 is installed at the upper end of the rail flat car base 1, a rotating base 6 is installed at the upper end of the support frame 5, and a three-dimensional scanner 7 is installed at the upper end of the rotating base 6. The 3D scanner 7 includes a left cavity 11, a connecting cavity 12, and a right cavity 10. The connecting cavity 12 is arranged between the left cavity 11 and the right cavity 10, and its two ends are communicated with the left cavity 11 and the right cavity 10, respectively. A power supply module 29 and a laser scanning unit 13 are installed in the right cavity 10, and the output end of the laser scanning unit 13 extends to the outside of the right cavity 10. The output end of the laser scanning unit 13 is provided with a pulse ranging laser 30. The CPU 26, the motor control module 27, the wireless data transmission module 28 and the servo motor 18 are installed in the left cavity 11, the rear end of the servo motor 18 extends to the outside of the left cavity 11, and the servo motor 18 is connected with the outer wall of the left cavity 11 through the mounting plate 19 and bolts. The electric push rod 14 is installed at the output end of the servo motor 18, and the telescopic head 15 is installed at the output end of the electric push rod 14. And one end of the telescopic head 15 extends to the outside of the left cavity 11, the outer wall of the telescopic head 15 is provided with a mirror seat 17, the outer wall of the mirror seat 17 is provided with a mirror mechanism 24, the outer walls of the left cavity 11 and the right cavity 10 are provided with a first cooling fan 8, and the outer wall of the first cooling fan 8 is provided with a first dustproof net 9.
[0033] Furthermore, the output of the power supply module 29 is electrically connected with the input of the central processor 26, which is electrically connected with the input of the motor control module 27. The central processor 26 is bidirectionally electrically connected with the wireless data transmission module 28 and the laser scanning unit 13. The power supply module 29 can supply power to the central processor 26 and the components inside the equipment. The laser scanning unit 13 can measure the tunnel section, upload the measurement information to the terminal through the wireless data transmission module 28, and process the data.
[0034] Furthermore, the lower ends of the track wheels 2 on both sides are provided with guide rails 4, which are fixedly connected with the foundation. The guide rails 4 can guide the equipment to advance along the tunnel, which is convenient for the equipment to measure the cross section of the whole tunnel.
[0035] Furthermore, a stepping motor 21 is installed in the rotating base 6, and the output end of the stepping motor 21 is in transmission connection with the 3D scanner 7. The stepping motor 21 can drive the 3D scanner 7 to rotate as a whole and adjust the cross-section measurement direction.
[0036] Furthermore, a linear bearing 16 is installed at the joint between the telescopic head 15 and the outer wall of the left cavity 11, and the telescopic head 15 is slidably connected with the linear bearing 16. The linear bearing 16 can improve the telescopic precision of the telescopic head 15, improve the sealing performance of the joint, and prevent dust from infiltrating into the left cavity 11, resulting in poor contact of components.
[0037] Furthermore, the upper surface of the connecting cavity 12 is provided with three laser positioning receivers 20, and the three laser positioning receivers 20 are equally distributed. During detection, in order to prevent the laser from irradiating the same position of the mirror mechanism 24 for a long time, which will cause the point to overheat and deform, the electric push rod 14 can drive the mirror mechanism 24 to expand and contract and switch the laser irradiation sites, and there are three switching sites in total. Corresponding to the three groups of laser positioning receivers 20 respectively, when switching to a certain position, the laser positioning receiver 20 at that position can receive the pulse ranging laser 30, thus realizing the positioning anti-polarization function.
[0038] Further, the mirror mechanism 24 includes a base 241, a central mirror 246, and end mirrors 248, two of which are arranged at the upper and lower ends of the central mirror 246, respectively. Both ends of the base 241 are screwed with the mirror base 17 by screws 245, and an installation groove 242 is formed in the base 241. And the central mirror 246 and the two end mirrors 248 are both arranged in the installation groove 242. The mirror mechanism 24 is divided into three parts: the central mirror 246 and the upper and lower end mirrors 248. When one of them is damaged, it will not affect the whole. The equipment has at least two detection sites to switch, so as to complete this measurement, and it is convenient to replace the mirror surface after the measurement.
[0039]Furthermore, both sides of the mounting groove 242 are provided with dismounting grooves 243, and the dismounting grooves 243 are integrally formed with the mounting groove 242. The inner wall of the mounting groove 242 is provided with flexible rubber welts 244, and the upper and lower surfaces of the central reflector 246 are provided with flexible rubber spacers 247. The rear end faces of the central reflector 246 and the two end reflectors 248 are connected with the mounting groove 242 by magnetic back plates 249. The mirrors are all connected to the mounting groove 242 in the base 241 by magnetic attraction. When dismounting, it is convenient and quick to dismount the central mirror 246 and then the two end mirrors 248. The flexible rubber welt 244 and the flexible rubber spacer 247 can make the mirror surfaces more tightly connected and improve the mounting firmness by elastic action.
[0040] Furthermore, the rear end face of the base 241 is equipped with a semiconductor refrigeration sheet 25, the upper end of the mirror base 17 is equipped with a second heat dissipation fan 22, and the outer wall of the second heat dissipation fan 22 is equipped with a second dust-proof net 23. As the reflectivity of the laser is not as high as 100% when reflected by the mirror mechanism 24, the mirror will absorb a certain amount of energy when transmitting the pulse ranging laser 30, which will be converted into heat energy. Due to the thermal expansion of the mirror material, local thermal stress and mechanical stress when the mirror is fixed, if the laser is irradiated on the mirror surface for a long time, it will overheat and deform, which will affect the transmission quality of the light beam. The arrangement of the semiconductor refrigeration sheet 25 can absorb the heat generated by the mirror surface and discharge it from the back, and then discharge it through the second cooling fan 22, so as to realize the heat dissipation of the mirror surface and avoid overheating.
[0041] Further, an imaging method of a three-dimensional imaging device for engineering project planning includes the following steps:
[0042] Step 1, laying a guide rail 4 extending inward along the tunnel direction in advance in an engineering tunnel;
[0043] Step 2, place that three-dimensional scanner 7 at the initial position of the guide rail 4, so that the rail wheel 2 on the rail flat car base 1 at the bottom of the three-dimensional scanner 7 is butted with the guide rail 4;
[0044] Step 3, starting the rail flat car base 1, and driving the three-dimensional scanner 7 to advance along the guide rail 4 step by step by the power module in the rail flat car base 1;
[0045] Step 4: When stepping to the test point, the laser scanning unit 13 inside the right cavity 10 of the 3D scanner 7 emits the pulse ranging laser 30 in the direction of the left cavity 11. After hitting the mirror mechanism 24 outside the left cavity 11, the pulse ranging laser 30 is vertically reflected to the tunnel surface by the mirror surface, and the distance between the pulse ranging laser 30 and the tunnel surface is fed back to measure the single point distance. At the same time, the servo motor 18 drives the mirror mechanism 24 to rotate, so that the pulse ranging laser 30 moves around the tunnel surface.
[0046] Step 5: When the equipment advances to a certain distance, the central processor 26 will send a signal to the motor control module 27 to drive the electric push rod 14 to run, drive the mirror mechanism 24 to expand and contract, change the irradiation point of the pulse ranging laser 30 to the mirror surface, and when the irradiation point is switched, the laser positioning receiver 20 on the connecting cavity 12 will receive the pulse ranging laser 30 rays to realize the positioning of the expansion and contraction distance. The post-positioning CPU 26 sends feedback to the terminal through the wireless data transmission module 28, so that the terminal advances or retreats by a moving distance from the current measurement result, and continues measurement and calculation, and so on until the equipment moves to the end of the guide rail 4, thus completing the scanning and imaging of the whole engineering tunnel.
[0047] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, but can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as illustrative and non-restrictive in all respects. The scope of the invention is defined by the appended claims rather than the above description, and therefore all changes that fall within the meaning and range of equivalents of the claims are intended to be embraced by the invention. Any reference signs in the claims should not be regarded as limiting the claims involved.
