CN113295691B

CN113295691B - Image acquisition device

Info

Publication number: CN113295691B
Application number: CN202110558225.9A
Authority: CN
Inventors: 史旭刚; 姚毅; 林耘
Original assignee: Luster LightTech Co Ltd; Suzhou Luster Vision Intelligent Device Co Ltd; Suzhou Lingyunguang Industrial Intelligent Technology Co Ltd
Current assignee: Luster LightTech Co Ltd; Suzhou Luster Vision Intelligent Device Co Ltd; Suzhou Lingyunguang Industrial Intelligent Technology Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2023-07-14
Anticipated expiration: 2041-05-21
Also published as: CN113295691A

Abstract

The invention belongs to the technical field of detection, and discloses an image acquisition device. The image acquisition device is configured to acquire images of internal threads on the hole wall of a threaded hole and comprises a rack, a plurality of reflecting mirrors and a plurality of cameras, wherein the reflecting mirrors and the cameras are fixedly connected to the rack, the cameras are distributed in a circumferential array around the axis of the threaded hole, each camera is vertically arranged, the reflecting mirrors are arranged at the bottoms of the cameras in a one-to-one correspondence mode, and the reflecting mirrors can reflect the images of the appointed areas in the threaded hole to the cameras respectively. The image acquisition device does not need to incline the camera, reduces the volume of the image acquisition device, and can detect the internal threads by replacing the reflecting mirrors with different angles when detecting the internal threads of the threaded holes with small apertures, and does not need to keep the camera away from the threaded holes, so that the detected images are clear.

Description

Image acquisition device

Technical Field

The invention relates to the technical field of detection, in particular to an image acquisition device.

Background

In the installation of all kinds of spare parts, for the dismantlement convenience, can offer the screw hole usually on the spare part, through screw or screw connection, consequently, the quality problem of internal thread in the screw hole can lead to the internal thread to slide the silk usually for whole spare part probably can scrap, and the loss is great.

In order to avoid the above problems, it is necessary to perform quality detection on the internal thread in the screw hole and the external thread on the screw or the screw in advance, thereby eliminating defective products. Because the screw and the screw are standard components and have reliable quality, the quality of the internal thread of the threaded hole in the part is required to be detected. However, the internal thread is located in the hole and is not easy to observe, and particularly, the thread with a deeper depth is difficult to detect.

The thread quality detection comprises detecting the inner diameter, the outer diameter, the number of threads, the tooth distance between every two adjacent circles of threads, the distance between the first circle of threads and the last circle of threads, the effective teeth of the threads and whether foreign matters exist between the threads.

In the prior art, an image acquisition device acquires images of all parts in a threaded hole through a plurality of cameras, and after algorithm processing, the detection of the threads can be completed. When acquiring images in the threaded hole, the focal length of the camera needs to be placed on the internal threads at the edge of the threaded hole, so that the camera needs to be inclined by a corresponding angle according to the focal length and the size of the threaded hole, and the volume of the image acquisition device is larger; if the camera is larger than the threaded hole in size when acquiring the image of the internal thread with smaller threaded hole diameter, the camera needs to be far away from the threaded hole, and the image blurring and the poor definition can be caused by the far distance.

Therefore, there is a need to solve the above problems.

Disclosure of Invention

The invention aims to provide an image acquisition device which is used for solving the problems of image blurring and poor definition caused by the fact that a camera needs to be far away from a threaded hole when acquiring images of internal threads with smaller threaded hole diameters.

To achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an image acquisition device, is configured to the image of the internal thread on the pore wall of collection screw hole, including the frame, and all the rigid coupling in a plurality of speculum and a plurality of camera in the frame, a plurality of cameras are circumference array distribution around the axis of screw hole, every the camera is all vertical setting, a plurality of speculum one-to-one set up in the bottom of a plurality of cameras, each the speculum can with the image of each appointed region in the screw hole is reflected respectively to each the camera.

Preferably, the frame includes:

the first connecting body is a polygonal plate body, the first connecting body is horizontally arranged, and the number of sides of the plate body is equal to the number of cameras; and

The number of the second connectors is equal to the number of sides of the polygon, each second connector is respectively arranged on each side wall of the first connector, and the second connectors can fix the camera and the reflecting mirror.

Preferably, the image acquisition device comprises four cameras and four reflectors, and the first connector is a quadrilateral plate body.

Preferably, the second connector includes a first connecting plate, a second connecting plate, and a third connecting plate, wherein:

the first connecting plate is vertically arranged on the side wall of the first connecting body, extends out of the bottom surface of the first connecting body, and is provided with a first positioning groove for positioning the second connecting body and a second positioning groove for positioning the second connecting plate;

the second connecting plate is fixedly arranged in the second positioning groove and is configured to fix the camera; and

The third connecting plate is vertically and fixedly arranged at the bottom of the second connecting plate and is configured to fix the reflecting mirror.

Preferably, the second connector further comprises a fourth connecting plate, the fourth connecting plate is fixedly arranged on the third connecting plate, a first positioning hole and a first sliding groove for installing the reflector are formed in the fourth connecting plate, and the first sliding groove is arc-shaped and takes the first positioning hole as a circle center.

Preferably, the frame further comprises a central column, the central column is vertically arranged at the bottom of the first connecting body and connected with the first connecting body, a support is connected to the bottom of the central column, and a light source is fixedly arranged on the support.

Preferably, each reflecting mirror is fixedly arranged on the central column, and the first connecting body is rotatably connected to the central column and can rotate around the axis of the central column;

the plurality of reflectors are distributed in a circumferential array around the axis of the center post, and the number of reflectors is an integer multiple of the number of cameras.

Preferably, the rack further comprises a sleeve, the sleeve is fixedly arranged at the top of the first connecting body, and the axis of the sleeve is coincident with the axis of the central column;

the image acquisition device further comprises a driving piece, wherein the driving piece is connected with the sleeve and can drive the sleeve to rotate around the axis of the center column.

Preferably, the frame further includes a third connector connected to the first connector and the center post, respectively, and the third connector enables the image capturing device to be connected to an external apparatus.

Preferably, the third connector includes:

the fifth connecting plate is vertically arranged on the bottom surface of the first connecting body, and a connecting hole for fixing the image acquisition device is formed in the fifth connecting plate; and

The connecting rod, be provided with on the center post and be used for fixing a position the third constant head tank of connecting rod, the one end of connecting rod inserts and fixes in the third constant head tank, the other end of connecting rod connect in the fifth connecting plate.

The invention has the beneficial effects that: the cameras which are vertically arranged are distributed in the circumferential array, and the cameras reflect the images of the threads at different positions in the threaded hole through the reflectors, so that the cameras do not need to be inclined, and the volume of the image acquisition device is reduced; and when detecting the internal thread of the screw hole of aperture, can detect the internal thread through changing the speculum of different angles, need not to keep away from the screw hole with the camera to make the detected image clear.

Drawings

Fig. 1 is a schematic structural diagram of an image acquisition device according to an embodiment of the present invention;

FIG. 2 is a top view of the image capture device of FIG. 1;

FIG. 3 is a schematic diagram of the image capturing device of FIG. 1 with the camera module removed;

FIG. 4 is a schematic view of the first connector of FIG. 3;

FIG. 5 is a schematic view of the second connector of FIG. 3;

fig. 6 is a schematic structural view of the center post of fig. 3.

In the figure:

1. a frame;

11. a first connecting body; 111. a first mounting hole; 112. a second mounting hole; 113. a relief groove;

12. a second connector; 121. a first connection plate; 1211. a first positioning groove; 1212. a second positioning groove; 122. a second connecting plate; 123. a third connecting plate; 124. a fourth connecting plate; 1241. a first positioning hole; 1242. a first chute;

13. a center column; 131. a third positioning groove; 132. a third mounting hole; 133. a fourth mounting hole; 134. a second positioning hole;

14. a third connector; 141. a fifth connecting plate; 142. a connecting rod;

15. a sleeve;

16. a bracket;

21. a camera; 22. a lens;

3. a reflecting mirror;

4. a light source;

5. a workpiece.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Example 1

In the prior art, an image acquisition device acquires images of all parts in a threaded hole through a plurality of cameras, and after algorithm processing, the detection of the threads can be completed. When the images in the threaded holes are collected, the focal length of the camera needs to be placed on the internal threads at the edges of the threaded holes, so that the camera needs to incline by a corresponding angle according to the focal length and the size of the threaded holes, and the size of the image collecting device is larger. And, if the size of the camera is larger than that of the screw hole when the image of the internal screw thread with smaller screw hole diameter is collected, the camera needs to be far away from the screw hole, so that the image blurring is possibly caused by the far distance, and the definition is poor.

In order to solve the above-mentioned problems, as shown in fig. 1, the present embodiment provides an image capturing device configured to capture images of internal threads on a hole wall of a threaded hole, including a frame 1, a plurality of camera modules and a plurality of reflecting mirrors 3, wherein the camera modules include cameras 21 and lenses 22 disposed on the cameras 21, the plurality of camera modules are distributed in a circumferential array around an axis of the threaded hole, each camera 21 and each lens 22 are vertically disposed, the plurality of reflecting mirrors 3 are disposed at bottoms of the plurality of lenses 22 in a one-to-one correspondence manner, each reflecting mirror 3 can reflect images of each designated area in the threaded hole to each lens 22, so as to reflect images of each designated area in the threaded hole of a workpiece 5 for each camera 21, so that the image capturing device captures images of all internal threads in the threaded hole without tilting the cameras 21 and the lenses 22, and the volume of the image capturing device is reduced; and when detecting the internal thread of the threaded hole with small aperture on the workpiece 5, the internal thread can be detected by replacing the reflecting mirror 3 with a different angle, and the camera 21 is not required to be far away from the threaded hole, so that the acquired image can be clear.

Further, in order to optimize the structure of the image capturing device, as shown in fig. 3, the rack 1 includes a first connector 11 and a plurality of second connectors 12, the first connector 11 is a polygonal plate, the first connector 11 is horizontally disposed, and the number of sides of the plate is equal to the number of cameras 21. The number of the second connecting bodies 12 is equal to the number of sides of the polygon, each second connecting body 12 is respectively arranged on each side wall of the first connecting body 11, and the second connecting bodies 12 can fix the cameras 21 and the reflecting mirrors 3, so that the cameras 21 and the reflecting mirrors 3 are uniformly distributed, images of complete threads in the threaded holes can be acquired, and the structure of the image acquisition device is optimized.

Specifically, as shown in fig. 1 and 2, in the present embodiment, the image capturing device includes four cameras 21 and four reflectors 3, the first connector 11 is a quadrangular plate, the four cameras 21 are disposed in pairs, each camera 21 is disposed on a peripheral wall of four sides of the first connector 11, and the four reflectors 3 are disposed at bottoms of the four cameras 21 in a one-to-one correspondence manner, so as to reflect images of threads of each quarter area in the threaded holes on the workpiece 5 for the 4 cameras 21, respectively, thereby capturing images of complete threads in the threaded holes.

Further, in order to make the structure of the image capturing device more compact, as shown in fig. 3 to 6, the peripheral walls of four sides of the first connecting body 11 are provided with a first mounting hole 111 and a yielding groove 113, the second connecting body 12 is fixed on the first connecting body 11 through the first mounting hole 111, the yielding groove 113 avoids the interference between the first connecting body 11 and the cameras 21, and reduces the distance between two opposite cameras 21, thereby reducing the volume of the image capturing device and making the structure of the image capturing device more compact.

Preferably, in order to facilitate the installation of the camera 21 and the reflecting mirror 3 and improve the stability of the frame 1, the second connecting body 12 includes a first connecting plate 121, a second connecting plate 122 and a third connecting plate 123, the first connecting plate 121 is vertically disposed on a side wall of the first connecting body 11, the first connecting plate 121 extends out of a bottom surface of the first connecting body 11, and a first positioning groove 1211 for positioning the second connecting body 12 and a second positioning groove 1212 for positioning the second connecting plate 122 are disposed on the first connecting plate 121. The first connection plate 121 can be fastened to the peripheral wall of the first connection body 11 through the first positioning groove 1211, and the first connection plate 121 is positioned and fixed to the first connection body 11 through the mounting groove and the first mounting hole 111 provided on the first positioning groove 1211.

The second connecting plate 122 is lap-jointed and positioned to the first connecting plate 121 by the second positioning groove 1212, and is fixed to the first connecting plate 121 by the mounting groove provided on the first connecting plate 121 and the mounting hole provided on the second connecting plate 122, and the camera 21 is fixed to the second connecting plate 122.

The bottom of the second connection plate 122 is provided with a mounting hole for fixing the third connection plate 123 such that the third connection plate 123 is fixed to the bottom of the second connection plate 122. The third connection plate 123 is vertically disposed, and the reflecting mirror 3 is fixed on the third connection plate 123. Not only is the installation of the camera 21 and the reflecting mirror 3 facilitated, but also the camera 21 and the reflecting mirror 3 are firmly fixed on the stand 1, and the positioning accuracy of the camera 21 and the reflecting mirror 3 can be packaged, so that the stability of the stand 1 is improved.

By means of the above structure, since the reflecting mirror 3 is fixed on the frame 1, one type of reflecting mirror 3 can only collect the internal threads of the threaded holes with partial aperture sizes corresponding to the inclination angle of the reflecting mirror 3, if the internal threads of the threaded holes with other aperture sizes need to be collected, the reflecting mirror 3 with different inclination angles need to be replaced, in order to solve the above problem, preferably, the second connecting body 12 further comprises a fourth connecting plate 124, the fourth connecting plate 124 is fixedly arranged on the third connecting plate 123, the fourth connecting plate 124 is provided with a first positioning hole 1241 and a first sliding groove 1242 for installing the reflecting mirror 3, the first sliding groove 1242 is arc-shaped, and the first positioning hole 1241 is used as the center of a circle, so that the inclination angle of the reflecting mirror 3 can be adjusted according to the aperture sizes of the threaded holes of the workpieces 5 to be detected, thereby the reflecting mirrors 3 with different inclination angles need not to be replaced, the universality of the image collecting device is improved, and the cost is reduced.

Further, since the external light source cannot be irradiated into the screw hole when detecting the screw hole having a larger number of screw turns and a larger screw pitch, in order to solve the above problem, the frame 1 further includes the center post 13, the center post 13 is vertically disposed at the bottom of the first connecting body 11, a plurality of fourth mounting holes 133 are provided on the top surface of the center post 13, and the center post 13 is fixed at the bottom of the first connecting body 11 through the plurality of fourth mounting holes 133. The bottom of center post 13 is connected with support 16, and light source 4 is fixed on support 16 to make light source 4 can direct irradiation get into the screw hole in, improved image acquisition device's efficiency.

Preferably, in order to enable the light source 4 to adjust the brightness in the threaded hole according to the depths of different threaded holes, the bottom of the center post 13 is provided with a plurality of second positioning holes 134 vertically arranged, the bracket 16 is provided with a vertically extending positioning groove, the bracket 16 is fixed on the second positioning holes 134 through screws, and the heights of the light source 4 can be adjusted by selecting the second positioning holes 134 with different heights, so that the light source 4 can adjust the brightness in the threaded hole according to the depths of different threaded holes.

Further, in order to enable the image capturing device to be firmly connected to an external apparatus, the frame 1 further includes a third connecting body 14, the third connecting body 14 being connected to the first connecting body 11 and the center post 13, respectively, and the image capturing device being connected to the external apparatus through the third connecting body 14.

Specifically, the third connecting body 14 includes a fifth connecting plate 141 and a connecting rod 142, one side of the first connecting body 11 extends outwards to form a first connecting portion, a second mounting hole 112 vertically penetrating through the first connecting body 11 is provided on the first connecting portion, the top of the fifth connecting plate 141 is fixed on the first connecting body 11 through the second mounting hole 112, the fifth connecting plate 141 is vertically arranged at the bottom of the first connecting body 11, and a connecting hole for fixing the image capturing device is provided on the fifth connecting plate 141. The center post 13 is provided with the third positioning groove 131 for positioning the connecting rod 142, one end of the connecting rod 142 can be inserted into and fixed in the third positioning groove 131, and the other end of the connecting rod 142 is connected to the fifth connecting plate 141, so that the first connecting body 11, the center post 13 and the third connecting body 14 form a closed structure, the stability of the frame 1 is improved, and the image acquisition device can be firmly connected to external equipment.

Example two

Compared with the image acquisition device in the first embodiment, the image acquisition device provided by the embodiment is more suitable for scenes with more abundant time for image acquisition, and the cost of the image acquisition device is greatly reduced when the image acquisition device can ensure that the images of the complete internal threads in the threaded holes are acquired.

Specifically, in this embodiment, each of the reflecting mirrors 3 is fixedly disposed on the central column 13, the first connecting body 11 is rotatably connected to the central column 13 and can rotate around the axis of the central column 13, the plurality of reflecting mirrors 3 are distributed in a circumferential array around the axis of the central column 13, and the number of the reflecting mirrors 3 is an integer multiple of the number of the cameras 21, when the image capturing device is used, the cameras 21 can be made to capture images of threads of each part in the threaded holes by rotating the cameras 21 to the top of each reflecting mirror 3, so that the cameras 21 can capture images of complete threads in the threaded holes while the number of the cameras 21 is reduced. The cost of the image acquisition device is greatly reduced.

Specifically, in the present embodiment, the number of camera modules is two, and the two camera modules are disposed opposite to each other. It is understood that in other embodiments, the number of camera modules may be one; or the number of the reflecting mirrors 3 is three, and the number of the camera modules is one, which is not limited herein.

Further, in order to improve the efficiency and precision of the image acquisition device for acquiring images, as shown in fig. 3, 4 and 6, the image acquisition device further comprises a driving member, the frame 1 further comprises a sleeve 15, the sleeve 15 is fixedly arranged at the top of the first connecting body 11, the axis of the sleeve 15 is coincident with the axis of the central column 13, the top of the central column 13 is provided with a third mounting hole 132, the central column 13 is rotatably connected to the bottom of the first connecting body 11 through the third mounting hole 132, the sleeve 15 is fixedly connected to the top of the first connecting body 11, the driving member is a servo motor, and the rotating shaft of the servo motor is connected to the sleeve 15 and can drive the sleeve 15 to rotate, so that the first connecting body 11 can rotate around the axis of the central column 13, and the efficiency and precision of the image acquisition device for acquiring images are improved.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. The image acquisition device is configured to acquire images of internal threads on the hole wall of a threaded hole and is characterized by comprising a frame (1), a plurality of reflecting mirrors (3) and a plurality of cameras (21), wherein the reflecting mirrors (3) and the cameras (21) are fixedly connected to the frame (1), the cameras (21) are distributed in a circumferential array around the axis of the threaded hole, each camera (21) is vertically arranged, the reflecting mirrors (3) are arranged at the bottoms of the cameras (21) in a one-to-one correspondence manner, and each reflecting mirror (3) can reflect the images of each appointed area in the threaded hole to each camera (21) respectively;

the frame (1) comprises: the first connecting body (11) is a polygonal plate body, the first connecting body (11) is horizontally arranged, and the number of sides of the plate body is equal to the number of cameras (21); and a plurality of second connection bodies (12), wherein the number of the second connection bodies (12) is equal to the number of sides of the polygon, each second connection body (12) is respectively arranged on each side wall of the first connection body (11), and the second connection bodies (12) can fix the camera (21) and the reflecting mirror (3);

the second connecting body (12) comprises a first connecting plate (121), a second connecting plate (122) and a third connecting plate (123), wherein:

the first connecting plate (121) is vertically arranged on the side wall of the first connecting body (11), the first connecting plate (121) extends out of the bottom surface of the first connecting body (11), and a first positioning groove (1211) for positioning the second connecting body (12) and a second positioning groove (1212) for positioning the second connecting plate (122) are arranged on the first connecting plate (121);

a second connection plate (122) fixed in the second positioning groove (1212), the second connection plate (122) being configured to fix the camera (21); and

The third connecting plate (123) is vertically fixed at the bottom of the second connecting plate (122), and the third connecting plate (123) is configured to fix the reflecting mirror (3).

2. The image acquisition device according to claim 1, characterized in that it comprises four of said cameras (21) and four of said mirrors (3), said first connecting body (11) being a quadrangular plate.

3. The image capturing device according to claim 1, wherein the second connecting body (12) further comprises a fourth connecting plate (124), the fourth connecting plate (124) is fixedly arranged on the third connecting plate (123), a first positioning hole (1241) and a first sliding groove (1242) for installing the reflecting mirror (3) are formed in the fourth connecting plate (124), and the first sliding groove (1242) is arc-shaped and takes the first positioning hole (1241) as a center of a circle.

4. The image acquisition device according to claim 1, wherein the frame (1) further comprises a central column (13), the central column (13) is vertically arranged at the bottom of the first connecting body (11) and connected to the first connecting body (11), a support (16) is connected to the bottom of the central column (13), and a light source (4) is fixedly arranged on the support (16).

5. The image acquisition device according to claim 4, characterized in that the frame (1) further comprises a third connection body (14), the third connection body (14) being connected to the first connection body (11) and the central column (13), respectively, the third connection body (14) enabling the image acquisition device to be connected to an external device.

6. The image acquisition device according to claim 5, characterized in that the third connection body (14) comprises:

a fifth connecting plate (141) vertically arranged on the bottom surface of the first connecting body (11), wherein a connecting hole for fixing the image acquisition device is arranged on the fifth connecting plate (141); and

The connecting rod (142), be provided with on the center post (13) be used for fixing a position connecting rod (142) third constant head tank (131), one end of connecting rod (142) inserts and fixes in third constant head tank (131), the other end of connecting rod (142) connect in fifth connecting plate (141).

7. The image acquisition device is configured to acquire images of internal threads on the hole wall of a threaded hole and is characterized by comprising a frame (1), a plurality of reflecting mirrors (3) and a plurality of cameras (21), wherein the reflecting mirrors (3) and the cameras (21) are fixedly connected to the frame (1), the cameras (21) are distributed in a circumferential array around the axis of the threaded hole, each camera (21) is vertically arranged, the reflecting mirrors (3) are correspondingly arranged at the bottoms of the cameras (21), and each reflecting mirror (3) can reflect the images of each appointed area in the threaded hole to each camera (21) respectively;

the frame (1) comprises: the first connecting body (11) is a polygonal plate body, the first connecting body (11) is horizontally arranged, and the number of sides of the plate body is equal to the number of cameras (21); and a plurality of second connectors (12), wherein the number of the second connectors (12) is equal to the number of sides of the polygon, each second connector (12) is respectively arranged on each side wall of the first connector (11), and the second connectors (12) can fix the camera (21);

the frame (1) further comprises a center column (13), the center column (13) is vertically arranged at the bottom of the first connecting body (11) and connected with the first connecting body (11), the bottom of the center column (13) is connected with a bracket (16), and the bracket (16) is fixedly provided with a light source (4);

each reflector (3) is fixedly arranged on the central column (13), and the first connecting body (11) is rotatably connected to the central column (13) and can rotate around the axis of the central column (13);

the plurality of reflectors (3) are distributed in a circumferential array around the axis of the central column (13), and the number of reflectors (3) is an integer multiple of the number of cameras (21).

8. The image acquisition device of claim 7, wherein:

the frame (1) further comprises a sleeve (15), the sleeve (15) is fixedly arranged at the top of the first connecting body (11), and the axis of the sleeve (15) is coincident with the axis of the central column (13);

the image acquisition device further comprises a driving piece, wherein the driving piece is connected to the sleeve (15) and can drive the sleeve (15) to rotate around the axis of the central column (13).