A multi-faceted metal rotating mirror for laser radar

Abstract

The present invention relates to the field of optical elements, and in particular to a multi-faceted metal rotating mirror for laser radar. It includes a fixed base, a mounting base, a split rotating mirror and a suction assembly; the mounting base is arranged on the fixed base and can rotate around a vertical axis, and a receiving cavity is arranged in the mounting base; the split rotating mirror includes a plurality of unit mirror bodies, all of which are universally hinged to enclose a circle, each unit mirror body is located in a receiving cavity and there is always a reflecting mirror surface exposed in the receiving cavity, and the split rotating mirror can rotate around a horizontal axis. The present invention can adjust the vertical field of view angle of the split rotating mirror and replace the reflecting mirror surface of the unit mirror body by rotating the split rotating mirror around the horizontal axis. By setting the suction assembly, a circulating airflow can be formed on the outside of the reflecting mirror surface exposed by the unit mirror body, thereby forming a gas protection barrier, strengthening the protection of the reflecting mirror surface, and cleaning the reflecting mirror surface when adjusting the angle or replacing the reflecting mirror surface.

Description

Technical Field

[0001] The invention relates to the field of optical elements, and in particular to a multi-faceted metal rotating mirror for a laser radar. Background Art

[0002] The metal rotating mirror is the main optical component of the mechanical rotating mirror laser radar. The mechanical rotating mirror laser radar is the earliest rotating mirror laser radar used in laser radar scanning. It mainly drives the reflector mirror to rotate by a motor to achieve laser beam scanning. The mechanical rotating mirror laser radar is widely used in autonomous driving, robots, security monitoring and other fields due to its simple structure, high reliability and fast scanning speed. It quickly scans the surrounding environment through the rotation of the metal rotating mirror, obtains accurate distance and speed information, and provides powerful perception capabilities for various smart devices.

[0003] The accuracy of the rotating mirror is crucial to the performance of the LiDAR. The existing LiDAR metal rotating mirror is difficult to adjust the vertical angle, so it needs to be used with a galvanometer to ensure the scanning range. However, using it with a galvanometer will increase the overall size of the LiDAR and have a significant impact on the appearance of the product. At the same time, the reflective surface of the metal rotating mirror may become dirty and worn during use, seriously affecting its service life.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention proposes a multi-faceted metal rotating mirror for a laser radar to solve the problems that the existing metal rotating mirror cannot adjust the angle in the vertical direction and has a short lifespan.

[0006] A laser radar multi-faceted metal rotating mirror of the present invention adopts the following technical solution: comprising:

[0007] Fixed base;

[0008] A mounting base, which is arranged on the fixed base and can rotate around a vertical axis, wherein a receiving cavity is arranged in the mounting base, and the receiving cavity has a lateral opening penetrating through a circumferential side surface of the mounting base;

[0009] The split rotating mirror comprises a plurality of unit mirror bodies, each unit mirror body having a plurality of reflective mirror surfaces, all the unit mirror bodies are universally hinged and enclosed in a circle through universal joints, each unit mirror body is located in a receiving cavity and each unit mirror body always has a reflective mirror surface aligned with the lateral opening of the receiving cavity so as to expose the receiving cavity; the split rotating mirror can rotate around a horizontal axis, so as to change the angle of the reflective mirror surface exposed by the unit mirror body or replace the exposed reflective mirror surface.

[0010] Optionally, the unit mirror body is a polyhedron.

[0011] Optionally, the laser radar multi-faceted metal rotating mirror also includes an adjustment device, which is used to drive the split rotating mirror to rotate around a horizontal axis.

[0012] Optionally, the mounting base includes an upper mirror cover and a lower mirror cover, the lower mirror cover is arranged on a fixed base and can rotate around a vertical axis, the upper mirror cover is arranged above the lower mirror cover and is detachably fixedly connected to the lower mirror cover, a plurality of lower rotation grooves are arranged on the upper surface of the lower mirror cover at circumferential intervals, and a plurality of upper rotation grooves are arranged on the lower surface of the upper mirror cover at circumferential intervals, and the lower rotation grooves and the upper rotation grooves are arranged relative to each other to form the above-mentioned accommodating cavity.

[0013] Optionally, a lower accommodating groove is arranged on the entity between two adjacent lower rotation grooves on the lower mirror cover, and an upper accommodating groove is arranged between two adjacent upper rotation grooves on the upper mirror cover. The upper accommodating groove and the lower accommodating groove are arranged relative to each other to form an accommodating space, and the universal joint is arranged in the accommodating space.

[0014] Optionally, the upper mirror cover and the lower mirror cover are connected by a first bolt.

[0015] Optionally, the laser radar multi-faceted metal rotating mirror further includes a suction component, and the suction component includes an air suction pump and an air blowing pump;

[0016] The lower mirror cover is provided with an air inlet opening facing upward, the air inlet corresponds to the accommodating cavity one by one and is located outside the lateral opening of the accommodating cavity, the air inlet is connected to the air inlet end of the air pump, and air can be inhaled through the air pump;

[0017] The upper mirror cover is provided with a blowing port opening downwards, which corresponds one to one with the accommodating cavity and is located outside the lateral opening of the accommodating cavity. The blowing port is aligned with the air inlet up and down, and the blowing port is connected to the air outlet end of the blowing pump, so that air can be blown through the blowing pump.

[0018] Optionally, a plurality of first air guiding branch pipes are provided on the lower mirror cover, the first air guiding branch pipes correspond to the air intake ports one by one, one end of the first air guiding branch pipes is connected to the corresponding air intake ports, and the other end is connected to the air intake pump through the first air guiding main pipe.

[0019] Optionally, a plurality of second air guiding branches are provided on the upper mirror cover, the second air guiding branches correspond to the air blowing ports one by one, one end of the first air guiding branch is connected to the corresponding air inlet, and the other end is connected to the air inlet pump through the second air guiding main pipe.

[0020] Optionally, a central through hole is provided in the center of the upper mirror cover, a detachable top cover is provided on the top surface of the upper mirror cover, the top cover blocks the top opening of the central through hole, an air pump and an air suction pump are provided on the top surface of the lower mirror cover and located in the central through hole, and a filter assembly is provided at the air outlet end of the air suction pump.

[0021] The beneficial effects of the present invention are as follows: a split rotating mirror is arranged in a multi-faceted metal rotating mirror of a laser radar of the present invention, and the split rotating mirror includes a plurality of unit mirror bodies which are universally hinged and surrounded in one circle. The split rotating mirror is arranged on a mounting base and each unit mirror body exposes a reflecting mirror surface. The split rotating mirror can rotate around a vertical axis for circumferential scanning, and can rotate around a horizontal axis to adjust the vertical field of view angle to change or expand the scanning range, making it more flexible and convenient to use. At the same time, by rotating the split rotating mirror around the horizontal axis, the exposed reflecting mirror surface can be replaced, thereby extending the service life of the split rotating mirror.

[0022] Furthermore, by setting up the suction assembly, a circulating airflow can be formed outside the reflective mirror surface exposed by the unit mirror body, thereby forming a gas protection barrier, strengthening the protection of the reflective mirror surface, and reducing damage to the reflective mirror surface. When adjusting the angle of the reflective mirror surface or replacing the reflective mirror surface, the reflective mirror surface can be cleaned, further improving the use effect of the split rotating mirror and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the overall structure of a multi-faceted metal rotating mirror of a laser radar according to the present invention;

[0025] Figure 2 This is an exploded view of a multi-faceted metal rotating mirror of a laser radar according to the present invention;

[0026] Figure 3 A top view of a multi-faceted metal rotating mirror of a laser radar according to the present invention;

[0027] Figure 4 for Figure 3 Middle AA section view;

[0028] Figure 5 This is a schematic diagram of the structure of a laser radar multi-faceted metal rotating mirror without the top cover of the mirror;

[0029] Figure 6 It is a structural schematic diagram of the lower mirror cover in the present invention;

[0030] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0031] Figure 8 for Figure 6 Enlarged view of point B in the middle;

[0032] Fig. 9 It is a schematic diagram of the coordination between the adjustment device and the unit mirror body in the present invention;

[0033] Fig.10 It is a schematic structural diagram of the lower mirror cover from another angle in the present invention.

[0034] In the figure:

[0035] 100. Fixed base;

[0036] 200, lower mirror cover; 201, air intake; 202, first air guide pipe; 203, lower rotating groove; 205, lower accommodating groove; 206, motor mounting groove; 207, transmission groove; 210, mounting ring; 211, key;

[0037] 300, upper mirror cover; 301, air blowing port; 302, second air guide pipe;

[0038] 400, split rotating mirror; 410, unit mirror body; 430, universal joint;

[0039] 500, top cover;

[0040] 600, suction assembly; 610, air blowing pump; 620, air suction pump.

[0041] 710, first bolt; 720, second bolt;

[0042] 810, regulating motor; 820, worm; 830, worm wheel. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] like Figures 1 to 10 As shown, a laser radar multi-faceted metal rotating mirror provided in an embodiment of the present invention includes a fixed base 100, a mounting base and a split rotating mirror 400.

[0045] The mounting base is disposed on the fixed base 100 and can rotate around a vertical axis. An accommodating cavity is disposed in the mounting base. The accommodating cavity has a lateral opening that penetrates through the circumferential side surface of the mounting base.

[0046] The split rotating mirror 400 includes a plurality of unit mirror bodies 410, each of which has a plurality of reflective mirror surfaces. All the unit mirror bodies 410 are universally hinged and enclosed by a universal joint 430. Each unit mirror body 410 is located in a receiving cavity, and each unit mirror body 410 always has a reflective mirror surface aligned with the lateral opening of the receiving cavity, thereby exposing the receiving cavity. The split rotating mirror 400 can rotate around a horizontal axis, thereby changing the angle of the reflective mirror surface exposed by the unit mirror body 410 or replacing the exposed reflective mirror surface. When in use, the mounting base rotates to drive the split rotating mirror 400 to rotate around a vertical axis, and the split rotating mirror 400 performs circumferential scanning through the reflective mirror surface exposed by the unit mirror body 410. During the scanning process, the vertical field of view angle of the reflective mirror surface exposed by the unit mirror body 410 is adjusted by controlling the split rotating mirror 400 to rotate around the horizontal axis, thereby changing or expanding the scanning range of the split rotating mirror 400. After being used for a period of time, or when the exposed reflective surface of the unit mirror body 410 is dirty or damaged, the exposed reflective surface of the unit mirror body 410 can be replaced by controlling the split rotating mirror 400 to rotate around the horizontal axis, thereby extending the service life of the split rotating mirror 400.

[0047] In a further embodiment, the laser radar multi-faceted metal rotating mirror of the present invention further includes an adjusting device, which is used to drive the split rotating mirror 400 to rotate around the horizontal axis.

[0048] In one embodiment, referring to Fig. 9 As shown, the adjustment device includes an adjustment motor 810, a worm gear 830 and a worm 820. The adjustment motor 810 is arranged on the mounting base and its output shaft extends horizontally in the inner and outer directions (the inner side is close to the center of the mounting base, and the outer side is close to the center of the mounting base). The worm 820 is connected to the output shaft of the adjustment motor 810. The worm gear 830 is arranged on the side of one of the unit mirror bodies 410, and the worm gear 830 is meshed with the worm 820. When working, the adjustment motor 810 drives one of the unit mirror bodies 410 to rotate through the transmission of the worm gear 830 and the worm 820, and the unit mirror body 410 drives the other unit mirror bodies 410 to rotate synchronously, so as to achieve the angle adjustment of the split rotating mirror 400 around the horizontal axis or replace the exposed reflective mirror surface.

[0049] In another embodiment, the adjustment device includes an adjustment motor 810, a first bevel gear and a second bevel gear. The adjustment motor 810 is arranged on a mounting seat and its output shaft extends horizontally in the inner and outer directions. The first bevel gear (not shown in the figure) is connected to the output shaft of the adjustment motor 810. The second bevel gear (not shown in the figure) is arranged on the side of one of the unit mirror bodies 410, and the first bevel gear and the second bevel gear are meshed. When working, the adjustment motor 810 drives one of the unit mirror bodies 410 to rotate through the transmission of the first bevel gear and the second bevel gear, and the unit mirror body 410 drives the other unit mirror bodies 410 to rotate synchronously, so as to adjust the angle of the split rotating mirror 400 around the horizontal axis or replace the exposed reflective mirror surface. Naturally, the adjustment device can also be other forms of transmission, as long as it can realize the function of driving the split rotating mirror 400 to rotate around the horizontal axis, which will not be repeated here.

[0050] In a further embodiment, the unit mirror body 410 is a polyhedron, and the preferred unit mirror body 410 of the present invention is a cuboid or a cube.

[0051] In a further embodiment, to facilitate the assembly of the split rotating mirror 400, the mounting base includes an upper mirror cover 300 and a lower mirror cover 200. The lower mirror cover 200 is arranged on a fixed base 100 and can rotate around a vertical axis. The upper mirror cover 300 is arranged above the lower mirror cover 200 and is detachably fixedly connected to the lower mirror cover 200. A plurality of lower rotating grooves 203 are arranged at circumferential intervals on the upper surface of the lower mirror cover 200, and a plurality of upper rotating grooves are arranged at circumferential intervals on the lower surface of the upper mirror cover 300. The lower rotating grooves 203 and the upper rotating grooves are arranged relative to each other to form the above-mentioned accommodating cavity.

[0052] Furthermore, a lower accommodating groove 205 is physically provided between two adjacent lower rotating grooves 203 on the lower mirror cover 200, and an upper accommodating groove is provided between two adjacent upper rotating grooves on the upper mirror cover 300. The upper accommodating groove and the lower accommodating groove 205 are relatively arranged to form an accommodating space, and the universal joint 430 is arranged in the accommodating space.

[0053] Furthermore, the upper mirror cover 300 and the lower mirror cover 200 of the present invention are preferably connected by a first bolt 710 , and the upper mirror cover 300 and the lower mirror cover 200 may also be connected by snap-fitting to facilitate assembly and disassembly.

[0054] In this embodiment, a motor mounting slot 206 and a transmission slot 207 are further provided on the lower mirror cover 200 , the adjustment motor 810 is provided in the motor mounting slot 206 , and the worm 820 is provided in the transmission slot 207 .

[0055] In a further embodiment, a mounting ring 210 is provided on the lower mirror cover 200, and the lower mirror cover 200 is rotatably connected to the fixed base 100 through the mounting ring 210. A driving motor (not shown in the figure) is provided on the fixed base 100, and a key 211 is provided on the inner circumference of the mounting ring 210. The mounting ring 210 and the output shaft of the driving motor are connected through the key 211, so that the lower mirror cover 200 rotates under the drive of the driving motor.

[0056] In a further embodiment, the laser radar multi-faceted metal rotating mirror of the present invention further includes a suction assembly 600, which is configured to be able to cyclically blow and suck air to the unit mirror body 410 outside the side opening.

[0057] Specifically, the suction assembly 600 includes a suction pump 620 and a blowing pump 610 .

[0058] The lower mirror cover 200 is provided with an air intake port 201 opening upward, which corresponds one-to-one to the accommodating cavity and is located outside the lateral opening of the accommodating cavity (specifically, it can be said to correspond to the lower rotating groove 203 and is located outside the lower rotating groove 203). The air intake port 201 is connected to the air inlet end of the air pump 620, so that air can be inhaled through the air pump 620.

[0059] The upper mirror cover 300 is provided with a blowing port 301 opening downwards, the blowing port 301 corresponds one-to-one with the accommodating cavity and is located outside the lateral opening of the accommodating cavity (specifically, it can be said to correspond to the upper rotating groove and is located outside the upper rotating groove), the blowing port 301 is aligned with the air inlet 201 up and down, the blowing port 301 is connected to the air outlet end of the blowing pump 610, and air can be blown through the blowing pump 610. During operation, the lower mirror cover 200 and the upper mirror cover 300 drive the split rotating mirror 400 to rotate around the vertical axis (the center of the device), and the reflective mirror surface exposed by the unit mirror body 410 of the split rotating mirror 400 works to perform circumferential scanning on the object. At the same time, the suction pump 620 of the suction assembly 600 inhales air, and the blowing pump 610 blows air. The gas is blown out from the blowing port 301 of the upper mirror cover 300 and enters from the suction port 201 of the lower mirror cover 200, forming a gas barrier on the outer side of the reflective mirror surface exposed by the unit mirror body 410, thereby reducing damage to the reflective mirror surface and strengthening protection of the reflective mirror surface. When adjusting the vertical field angle of the reflective mirror surface exposed by the unit mirror body 410, due to the change in the angle of the reflective mirror surface exposed by the unit mirror body 410, the air blowing port 301 of the upper mirror cover 300 can clean the reflective mirror surface to a certain extent, thereby reducing the contamination of the reflective mirror surface; when replacing the reflective mirror surface exposed by the unit mirror body 410, the air blowing port 301 on the upper mirror cover 300 performs a comprehensive impact on the reflective mirror surface used last time, cleans the dust on the surface, and sucks it away through the air suction port 201 on the lower mirror cover 200, thereby ensuring the cleanliness of the reflective mirror surface for the next use.

[0060] Further, in order to facilitate the connection between the air inlet 201 and the air pump 620, a plurality of first air guide branches 202 are provided on the lower mirror cover 200, and the first air guide branches 202 correspond to the air inlet 201 one by one, and one end of the first air guide branch 202 is connected to the corresponding air inlet 201, and the other end is connected to the air pump 620 through the first air guide main pipe (not shown in the figure). More specifically, a first ventilation channel is provided inside the lower mirror cover 200, and one end of the first air guide channel is connected to the air inlet 201, and the other end is connected to the first air guide branch 202.

[0061] In order to facilitate the connection between the air outlet 301 and the air pump 610, a plurality of second air guide branches 302 are provided on the upper mirror cover 300, and the second air guide branches 302 correspond to the air outlet 301 one by one. One end of the first air guide branch 202 is connected to the corresponding air inlet 201, and the other end is connected to the air inlet pump 620 through the second air guide main pipe (not shown in the figure). More specifically, a second ventilation channel is provided inside the upper mirror cover 300, and one end of the second air guide channel is connected to the air outlet 301, and the other end is connected to the second air guide branch 302.

[0062] In a further embodiment, a central through hole is provided at the center of the upper mirror cover 300, and a removable top cover 500 is provided on the top surface of the upper mirror cover 300, and the top cover 500 blocks the top opening of the central through hole. The blowing pump 610 and the suction pump 620 are arranged on the top surface of the lower mirror cover 200 and are located in the central through hole. A filter assembly is provided at the air outlet end of the suction pump 620, and the gas sucked by the suction pump 620 through the air inlet 201 is filtered by the filter assembly and discharged to the central through hole. The air inlet end of the blowing pump 610 sucks the clean gas in the central through hole and blows it out through the blowing port 301. After using it for a period of time, the top cover 500 can be opened, the filter assembly can be removed, and the filter assembly can be cleaned or replaced.

[0063] Furthermore, the top cover 500 and the upper mirror cover 300 are connected by a second bolt 720 to facilitate assembly and disassembly.

[0064] In combination with the above embodiments, the use principle and working process of the present invention are as follows:

[0065] During operation, the driving motor drives the lower mirror cover 200 to rotate on the fixed base 100, and the lower mirror cover 200 and the upper mirror cover 300 drive the split rotating mirror 400 to rotate around the vertical axis. The split rotating mirror 400 performs circumferential scanning through the reflective mirror surface exposed by the unit mirror body 410, and at the same time, the blowing port 301 on the upper mirror cover 300 exhausts air and the suction port 201 of the lower mirror cover 200 inhales air, and then the surface of the reflective mirror surface is cyclically blown and inhaled to form a gas barrier to protect the reflective mirror surface from being damaged so as to work normally. When it is necessary to adjust the vertical field angle of the reflective mirror surface exposed by the unit mirror body 410, the corresponding unit mirror body 410 is controlled to rotate around the horizontal axis by the adjusting device, and the unit mirror body 410 drives all the other unit mirror bodies 410 to rotate a certain angle. At this time, the suction assembly 600 can clean the exposed reflective mirror surface to improve the use effect of the split rotating mirror 400. When the exposed reflective mirror surface of the unit mirror body 410 is dirty or worn, the split rotating mirror 400 is controlled to rotate through the adjusting device to replace the exposed reflective mirror surface. During the process of replacing the exposed reflective mirror surface, the air blowing port 301 on the upper mirror cover 300 will fully impact the reflective mirror surface used last time to clean the dust on the surface and suck it away through the air suction port 201 on the lower mirror cover 200 so that the undamaged reflective mirror surface can be used next time. It can be understood that the replacement of the reflective mirror surface can be carried out during shutdown to avoid affecting normal work.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser radar multi-faceted metal rotating mirror, characterized in that: include: Fixed base; A mounting base, which is arranged on the fixed base and can rotate around a vertical axis, wherein a receiving cavity is arranged in the mounting base, and the receiving cavity has a lateral opening penetrating through a circumferential side surface of the mounting base; A split rotating mirror, which includes a plurality of unit mirror bodies, each unit mirror body having a plurality of reflective mirror surfaces, all unit mirror bodies being universally hinged by universal joints and enclosing a circle, each unit mirror body being located in a receiving cavity and each unit mirror body always having a reflective mirror surface aligned with a lateral opening of the receiving cavity so as to expose the receiving cavity; The split rotating mirror can rotate around a horizontal axis. The laser radar multi-faceted metal rotating mirror also includes an adjusting device, which is used to drive the split rotating mirror to rotate around the horizontal axis. The adjusting device drives one of the unit mirror bodies to rotate, and the unit mirror body drives other unit mirror bodies to rotate synchronously, thereby changing the angle of the exposed reflective mirror surface of the unit mirror body or replacing the exposed reflective mirror surface.

2. The laser radar multi-faceted metal rotating mirror according to claim 1, characterized in that: The unit mirror body is a polyhedron.

3. The laser radar multi-faceted metal rotating mirror according to claim 1, characterized in that: The mounting base includes an upper mirror cover and a lower mirror cover. The lower mirror cover is arranged on a fixed base and can rotate around a vertical axis. The upper mirror cover is arranged above the lower mirror cover and is detachably fixedly connected to the lower mirror cover. A plurality of lower rotation grooves are arranged at circumferential intervals on the upper surface of the lower mirror cover, and a plurality of upper rotation grooves are arranged at circumferential intervals on the lower surface of the upper mirror cover. The lower rotation grooves and the upper rotation grooves are arranged relatively to form the above-mentioned accommodating cavity.

4. The laser radar multi-faceted metal rotating mirror according to claim 3, characterized in that: A lower accommodating groove is arranged on the entity between two adjacent lower rotating grooves on the lower mirror cover, and an upper accommodating groove is arranged between two adjacent upper rotating grooves on the upper mirror cover. The upper accommodating groove and the lower accommodating groove are arranged relative to each other to form an accommodating space, and the universal joint is arranged in the accommodating space.

5. The laser radar multi-faceted metal rotating mirror according to claim 3, characterized in that: The upper mirror cover and the lower mirror cover are connected by a first bolt.

6. The laser radar multi-faceted metal rotating mirror according to claim 3, characterized in that: The laser radar multi-faceted metal rotating mirror also includes a suction component, which includes an air suction pump and an air blowing pump; The lower mirror cover is provided with an air inlet opening facing upward, the air inlet corresponds to the accommodating cavity one by one and is located outside the lateral opening of the accommodating cavity, the air inlet is connected to the air inlet end of the air pump, and air can be inhaled through the air pump; The upper mirror cover is provided with a blowing port opening downwards, which corresponds one to one with the accommodating cavity and is located outside the lateral opening of the accommodating cavity. The blowing port is aligned with the air inlet up and down, and the blowing port is connected to the air outlet end of the blowing pump, so that air can be blown through the blowing pump.

7. The laser radar multi-faceted metal rotating mirror according to claim 6, characterized in that: A plurality of first air guiding branches are arranged on the lower mirror cover, and the first air guiding branches correspond to the air inlets one by one. One end of the first air guiding branch is connected to the corresponding air inlet, and the other end is connected to the air pump through the first air guiding main pipe.

8. The laser radar multi-faceted metal rotating mirror according to claim 6, characterized in that: A plurality of second air guide branches are arranged on the upper mirror cover, and the second air guide branches correspond to the air blowing ports one by one. One end of the first air guide branch is connected to the corresponding air suction port, and the other end is connected to the air suction pump through the second air guide main pipe.

9. The laser radar multi-faceted metal rotating mirror according to claim 6, characterized in that: A central through hole is arranged at the center of the upper mirror cover, a detachable top cover is arranged on the top surface of the upper mirror cover, the top cover blocks the top opening of the central through hole, an air blowing pump and an air suction pump are arranged on the top surface of the lower mirror cover and are located in the central through hole, and a filter assembly is arranged at the air outlet end of the air suction pump.

Images