A conveying device and a surface defect recognition device

Abstract

The application discloses a conveying device and a surface defect identification device, and belongs to the technical field of printed circuit manufacturing equipment. The conveying device comprises a rack, a conveying belt and a support plate which are installed on the rack. A plurality of first air holes are arranged on the conveying belt in a uniform interval along the conveying direction of the conveying belt. A support plate is arranged on the second belt surface of the conveying belt. The first air holes are connected with the second air holes through the shunt grooves on the support plate. The second air holes are connected with a negative pressure source. The suction force generated by the second air holes can act on the first air holes. The negative pressure adsorption flexible sheet is formed on the first belt surface of the conveying belt, so that the flexible sheet is attached to the conveying belt. The first plate surface of the support plate is a plane. The flexible sheet attached to the conveying belt is also a plane. Therefore, the accuracy of the detection result can be improved when the flexible sheet is detected for surface defects.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of printed circuit manufacturing equipment, and particularly relates to a conveying device and a surface defect identification device. BACKGROUND

[0002] In the PCB process, flexible sheet materials such as PP plates, copper foil plates or CCL plates need to be subjected to surface defect detection to screen out defective products that meet the defect standard. For the surface defect detection of these special flexible sheet materials, a CCD camera is usually used to take pictures of the surface to be detected of the flexible sheet material, and the detection result of the surface defect of the flexible sheet material is obtained after processing the taken pictures.

[0003] In the related art, a conveying belt capable of continuously conveying sheet materials is usually used as a sheet material conveying device, and a CCD camera is used to continuously take pictures and detect the sheet materials that reach the picture taking position on the conveying belt. Since the flexible sheet material has the performance of being easily bent and deformed, the flexible sheet material needs to be kept as flat as possible before being taken pictures, so as to improve the accuracy of the detection result. However, how to obtain better pictures when the flexible sheet material reaches the picture taking position of the CCD camera on the conveying belt is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0004] The present application aims to at least solve the technical problem of inaccurate detection result when the existing conveying belt is used to convey the flexible sheet material for surface defect detection. To this end, the present application provides a conveying device and a flexible sheet material detection device.

[0005] The conveying device provided by the embodiments of the present application comprises:

[0006] a rack;

[0007] a conveying belt movably installed on the rack, the conveying belt having a first belt surface for conveying the flexible sheet material and a second belt surface opposite to the first belt surface, a plurality of first air holes being distributed on the first belt surface, the plurality of first air holes being uniformly and spacedly arranged along the conveying direction of the conveying belt, and the first air holes penetrating through the first belt surface and the second belt surface;

[0008] A support plate is fixed to the frame, the support plate has a first plate surface which is a plane and is attached to the second belt surface, a plurality of shunt groove groups corresponding to the plurality of gas hole groups are arranged on the first plate surface, each shunt groove group comprises a plurality of shunt grooves, the plurality of shunt grooves in each shunt groove group are arranged on the support plate in the conveying direction of the conveying belt, and at least one second gas hole is arranged on the groove bottom or groove wall of each shunt groove, and the groove opening of the shunt groove is in communication with the first gas hole passing through the groove opening of the shunt groove.

[0009] The length direction of each shunt groove is parallel to the conveying direction, the distance between the adjacent two shunt grooves in the same shunt groove group is less than the diameter of the first gas hole, and the length of the shunt groove is greater than the center distance between the adjacent two gas holes in the gas hole group.

[0010] As an option, in order to better realize the present application, the plurality of gas hole groups are arranged in the direction perpendicular to the conveying direction, the plurality of shunt groove groups are arranged in the direction perpendicular to the conveying direction, and each shunt groove group corresponds to a gas hole group.

[0011] As an option, in order to better realize the present application, the shunt grooves in the adjacent shunt groove groups are arranged in a staggered manner.

[0012] As an option, in order to better realize the present application, the projection of the shunt groove overlaps in the direction perpendicular to the conveying direction.

[0013] As an option, in order to better realize the present application, the second gas hole is arranged at the center of the groove bottom of the shunt groove.

[0014] As an option, in order to better realize the present application, a wind box is arranged between the support plate and the frame, the wind box is fixed to the frame, the support plate is fixed to the wind box, and all the second gas holes on the support plate are in communication with the wind box cavities in the wind box.

[0015] The present application also provides a surface defect identification device, the structure of the surface defect identification device comprises a camera and the conveying device described above, the camera and the support plate are respectively arranged on the two sides of the conveying belt, and the shooting direction of the camera is towards the support plate.

[0016] As an option, in order to better realize the present application, the first plate surface of the support plate and the shunt grooves are coated with a black coating.

[0017] Optionally, in order to better realize the present application, the first plate surface is provided with a relief groove, the relief groove has a first inclined surface, the first inclined surface is arranged along a direction perpendicular to the conveying direction, the shooting direction of the camera is towards the first inclined surface, and the first inclined surface is coated with a black coating.

[0018] Optionally, in order to better realize the present application, the conveying belt comprises a first conveying belt and a second conveying belt, a portion of the second conveying belt is located above the first conveying belt, and the first conveying belt is provided below and the second conveying belt is provided above with the support plate.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The conveying device provided by the present application comprises a conveying belt, a plurality of first air holes arranged uniformly along the conveying direction of the conveying belt, a support plate arranged on the second belt surface of the conveying belt, a plurality of shunt grooves arranged on the support plate, a plurality of second air holes arranged on the shunt grooves, and a negative pressure source connected to the second air holes. The first air holes penetrate through the first belt surface and the second belt surface of the conveying belt, the second air holes are connected to the negative pressure source, the suction force generated by the second air holes can act on the first air holes, and the negative pressure adsorption flexible sheet is formed on the first belt surface of the conveying belt, so that the flexible sheet is attached to the conveying belt. The first plate surface of the support plate is a plane, so that the flexible sheet attached to the conveying belt is also a plane, thereby improving the accuracy of the detection result when the flexible sheet is detected for surface defects. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 The structure of the conveying device is shown in the schematic diagram;

[0023] Figure 2 The structure of the conveying belt is shown in the schematic diagram; Figure 1

[0024] The structure of the support plate is shown in the schematic diagram; Figure 3 Figure 1 The cross-sectional schematic diagram of the conveying belt and the support plate is shown;

[0025] Figure 4 The position of the inclined surface in the support plate is shown in the schematic diagram;

[0026] Figure 5 ​​

[0027] Figure 6 A structural schematic diagram of the surface defect recognition device is shown.

[0028] Reference signs:

[0029] 100 - rack;

[0030] 200 - conveyor belt; 210 - first belt surface; 220 - second belt surface; 230 - first air hole; 240 - first conveyor belt; 250 - second conveyor belt;

[0031] 300 - camera; 310 - first camera; 320 - second camera;

[0032] 600 - support plate; 610 - flow dividing groove; 620 - second air hole; 630 - support part; 640 - first inclined surface; 650 - avoiding groove;

[0033] 700 - air bellow. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work under the premise that the relative position relationship, movement condition and the like between the components in a certain posture are described, belong to the scope of protection of the present application.

[0035] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0036] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0038] This application is described below with reference to the accompanying drawings and specific embodiments:

[0039] like Figures 1 to 5 As shown in the figure, this application embodiment provides a conveying device, the structure of which includes a frame 100, a conveyor belt 200, and a support plate 600. The frame 100 serves as the mounting base for the conveyor belt 200 and the support plate 600. The conveyor belt 200 is indirectly mounted on the frame 100 via rollers, and the rollers are driven by a motor to rotate, thereby moving the conveyor belt 200 and conveying the flexible sheet. The conveyor belt 200 has opposing first belt surfaces 210 and second belt surfaces 220. The first belt surface 210 is used to contact and convey the flexible sheet. Both the first belt surface 210 and the second belt surface 220 are smooth belt surfaces. A group of air holes is distributed on the first belt surface 210. Each group of air holes includes multiple first air holes 230, the first being circular holes. The first air holes 230 penetrate the first belt surface 210 and the second belt surface 220 to achieve gas conduction. Multiple first air holes 230 in each air hole group are arranged at intervals on the conveyor belt 200 along the conveying direction of the conveyor belt 200, and the spacing between two adjacent first air holes 230 in each air hole group is the same, so that the multiple first air holes 230 in each air hole group are evenly arranged on the conveyor belt 200 along the conveying direction of the conveyor belt 200.

[0040] The support plate 600 is fixed to the frame 100 and is located on the side where the second surface of the conveyor belt 200 is located. The support plate 600 has a first surface and a second surface opposite to the first surface. The first surface is attached to the second surface 220 of the conveyor belt 200. The first surface is a smooth plane, which reduces the frictional resistance between the conveyor belt 200 and the support plate 600 when the conveyor belt 200 moves. On the other hand, it also allows the first surface to restrict and shape the shape of the conveyor belt 200, so that the position where the conveyor belt 200 is attached to the first surface is in a planar state. With this setting, when the flexible sheet is attached to the conveyor belt 200, the flexible sheet can be kept in a flat state, improving the accuracy of surface defect detection of the flexible sheet.

[0041] The first belt surface 210 of the support plate 600 is provided with a shunt groove set corresponding to the air hole set on the conveying belt 200. The shunt groove set includes a plurality of shunt grooves 610, which are strip-shaped grooves opened inwardly on the first belt surface 210, and the groove opening of the shunt groove 610 is attached to the second belt surface 220 of the conveying belt 200. When the conveying belt 200 moves, the air holes in the air hole set on the conveying belt 200 will pass through the shunt groove 610 in turn, so that the groove opening of the shunt groove 610 is in communication with the first air hole 230 passing through the groove opening of the shunt groove 610. The groove bottom or groove wall of each shunt groove 610 is provided with at least one second air hole 620, so that the second air hole 620 is in communication with the first air hole 230 through the shunt groove 610. When air is drawn in the second air hole 620, negative pressure is generated in the shunt groove 610, so that the conveying belt 200 is more stably attached to the first surface of the support plate 600, and negative pressure is also generated in the first air hole 230 to the first belt surface 210 of the conveying belt 200, so that the flexible sheet is adsorbed to the conveying belt 200, and the part of the flexible sheet corresponding to the first air hole 230 is adsorbed to the conveying belt 200. When air is blown in the second air hole 620, positive pressure is generated in the second air hole 620 to the first belt surface 210 of the conveying belt 200, so that the flexible sheet is blown away from the conveying belt 200.

[0042] The plurality of shunt grooves 610 in the shunt groove set are arranged on the support plate 600 in the conveying direction of the conveying belt 200. On the one hand, the spacing between the shunt grooves 610 can form a support part 630 for supporting the conveying belt 200, so as to ensure that the support plate 600 has enough support points and support area for the conveying belt 200, thereby avoiding the situation that the conveying belt 200 is recessed in the shunt groove 610 due to the overall depression of the first plane of the support plate 600. On the other hand, the first air holes 230 of the air hole set corresponding to the shunt groove set pass through all the shunt grooves 610 in the shunt groove set in turn, so that multiple first air holes 230 in the same air hole set can realize ventilation, thereby enabling multiple first air holes 230 to adsorb the flexible sheet at different positions when air is drawn in the second air hole 620, and achieving the effect of flattening the flexible sheet as a whole.

[0043] Further, the spacing between any two adjacent shunt grooves 610 in the same shunt groove set is less than the diameter of the first air hole 230, so that the first air hole 230 will not be completely blocked by the support part 630 when passing through the shunt groove 610, thereby enabling the first air hole 230 to maintain ventilation during the transition from one shunt groove 610 to another shunt groove 610, avoiding the situation that the negative pressure generated by the first air hole 230 is intermittent, and improving the accuracy of the flexible sheet surface defect detection.

[0044] In addition, the length direction of each of the flow distribution grooves 610 is parallel to the conveying direction, and the length of the flow distribution groove 610 is greater than the center distance between two adjacent air holes in the air hole group. In this way, during the movement of the conveying belt 200, each flow distribution groove 610 can at least communicate with one first air hole 230, thereby avoiding the situation that part of the flow distribution grooves 610 do not communicate with the first air holes 230, and further avoiding the situation that the negative pressure caused by the above situation causes the conveying belt 200 to be adsorbed to the inside of the flow distribution groove 610. On the other hand, the frequency of the air flow change of the first air hole 230 being blocked by the support part 630 during the movement is also reduced, and the frequency of the unevenness of the flexible sheet caused by the change of the adsorption force of the flexible sheet due to the air flow change of the first air hole 230 is also reduced.

[0045] It should be noted that in the present embodiment, the width of the flow distribution groove 610 is greater than or equal to the diameter of the first air hole 230, so that the first air hole 230 can completely communicate with the flow distribution groove 610.

[0046] Further, for a flexible sheet with a relatively wide size, in order to better flatten the flexible sheet by the conveying device, in the present embodiment, the air hole group is a plurality of groups, and the plurality of air hole groups are spaced apart along a direction perpendicular to the conveying direction, that is, the width direction of the conveying belt 200. In addition, the plurality of first air holes 230 in each air hole group are spaced apart along the conveying direction and parallel to the conveying direction. In this way, the first air holes 230 can be distributed along the conveying direction and the direction perpendicular to the conveying direction, so that the first air holes 230 can cover the conveying belt 200. On this basis, the flow distribution groove group is also a plurality of groups, and each flow distribution groove group corresponds to one air hole group, so that each first air hole 230 passing through the flow distribution groove 610 can generate a negative pressure and act on the flexible sheet. Even if the flexible sheet has a relatively wide size, it can also be well flattened on the conveying belt 200. Between any flow distribution groove 610 and any other adjacent flow distribution groove 610 on the support plate 600, the above-mentioned support part 630 is formed.

[0047] Preferably, after the plurality of air hole groups are distributed along the direction perpendicular to the conveying direction, the distance between the two adjacent air hole groups is equal, so that the plurality of air hole groups are uniformly spaced apart along the direction perpendicular to the conveying direction, and the uniformity of the adsorption force received by the flexible sheet is improved.

[0048] Further, along the direction perpendicular to the conveying direction, the distance between the two adjacent flow distribution groove groups is less than the diameter of the air hole, so that even if there is an error in the correspondence between the flow distribution groove group and the air hole group, the first air hole 230 can not be blocked by the support part 630 of the support plate 600 to a certain extent.

[0049] Further, in the embodiment, the flow distribution grooves 610 in adjacent groups are staggered, and correspondingly, the first air holes 230 in adjacent groups are staggered on the conveying belt 200. This arrangement makes the first air holes 230 more densely distributed on the conveying belt 200, thereby more effectively helping to flatten the flexible sheet on the conveying belt 200.

[0050] Specifically, on the basis of the staggered arrangement of the flow distribution grooves 610 in adjacent groups, the projection of the flow distribution grooves 610 overlaps in a direction perpendicular to the conveying direction. Moreover, after the flow distribution grooves 610 in any two adjacent groups are projected onto the same plane in a direction perpendicular to the conveying direction, the projections of the flow distribution grooves 610 are connected together. Here, the same plane refers to any plane parallel to the conveying direction. This arrangement can make the other air holes adjacent to a first air hole 230 not be blocked when the first air hole 230 is blocked by the support part 630; the unblocked first air hole 230 can then adsorb the flexible sheet onto the conveying belt 200, so that the blocked first air hole 230 will not cause the flatness of the flexible sheet to change.

[0051] Preferably, the staggered distance between the flow distribution grooves 610 is equal to the staggered distance between the first air holes 230, and the spacing between adjacent flow distribution grooves 610 is the same as the spacing between adjacent groups of air holes.

[0052] In the embodiment, the second air hole 620 is arranged at the center of the groove bottom of each flow distribution groove 610, so that the flow distribution groove 610 forms a symmetry center with the second air hole 620, and the air flow in the flow distribution groove 610 is more uniform.

[0053] Further, in order to make the air flow in the flow distribution grooves 610 on the entire support plate 600 relatively uniform, in the embodiment, a wind box 700 is arranged between the support plate 600 and the rack 100. The wind box 700 is fixed to the rack 100, has an internal cavity, and the bottom or the side wall near the bottom of the cavity is connected to the air source. The support plate 600 is fixed to the top of the wind box 700, achieving the relative fixed connection between the support plate 600 and the rack 100. All the second air holes 620 on the support plate 600 are in communication with the internal cavity of the wind box 700. In this way, the air source acts on the internal cavity of the wind box 700, and then the internal cavity of the wind box 700 acts on the second air holes 620, so that the air flow in the flow distribution grooves 610 is relatively uniform.

[0054] The embodiment also provides a surface defect identification device, and the structure of the surface defect identification device comprises the camera 300 and the conveying device. The camera 300 is fixed on the rack 100, and the camera 300 and the support plate 600 are located on the two sides of the conveying belt 200 respectively. The camera 300 is at a certain distance from the conveying belt 200, and the shooting direction of the camera 300 is towards the support plate 600, so that the shooting position of the camera 300 is located on the part of the conveying belt 200 adhered by the support plate 600. When the support plate 600 is not blocked by the flexible sheet, the camera 300 can shoot the image of the first belt surface 210 of the conveying belt 200 and the part of the image of the first plate surface of the support plate 600 through the first air hole 230. When the flexible sheet enters above the support plate 600 and blocks the support plate 600, the camera 300 cannot shoot the image of the part blocked by the flexible sheet, and the part of the image blocked also includes the image of the first belt surface 210 and the image of the part of the first plate surface shot through the first air hole 230.

[0055] Further, in order to make the camera 300 obtain the image more conveniently and reduce the interference of ambient light on the image, in the embodiment, the first plate surface, the side wall and the groove bottom of the shunt groove 610 are coated with a layer of black coating. When applied, the black coating can effectively absorb the excess light on the support plate 600, so that the support plate 600 serves as a black background, and the influence of the support plate 600 on the imaging of the camera 300 is reduced as much as possible, and the detection precision of the flexible sheet is improved. In the embodiment, the first belt surface 210 of the conveying belt 200 is a black belt surface, and the hole wall of the first air hole 230 is also black.

[0056] Further, since the support plate 600 is adhered to the conveying belt 200, the conveying belt 200 continuously rubs against the first plate surface of the support plate 600 during movement. In the long run, the black coating coated on the first plate surface of the support plate 600 is easily abraded, so that the color of the first plate surface of the support plate 600 is mottled, and the imaging of the camera 300 is affected.

[0057] To this end, the support plate 600 is further optimized in the present embodiment, and an inwardly recessed avoidance groove 650 is formed on the first plate surface along the direction perpendicular to the conveying direction, and the avoidance groove 650 is arranged along the direction perpendicular to the conveying direction. The cross section of the avoidance groove 650 is triangular, and the avoidance groove 650 has a first inclined surface 640 inclined towards the inside of the first plate surface, and the first inclined surface 640 is arranged along the direction perpendicular to the conveying direction. The entire avoidance groove 650 is also coated with a black coating, so that the first inclined surface 640 is coated with a black coating. Since the first inclined surface 640 is recessed towards the inside of the first plate surface, the first inclined surface 640 will not be in contact with the conveying belt 200, and the black coating on the first inclined surface 640 will not be abraded by the conveying belt 200. In view of this, the present embodiment directs the shooting direction of the first camera 300300 towards the first inclined surface 640, so that the shooting position of the first camera 300300 can fall on the first inclined surface 640, thereby improving the imaging effect of the camera 300 and the detection accuracy of the flexible sheet.

[0058] It should be noted that the avoidance groove 650 is arranged along the direction perpendicular to the conveying direction, and the avoidance groove 650 communicates with the plurality of diversion grooves 610, so that the avoidance groove 650 also has a negative pressure suction force. Therefore, in order to reduce the influence of the negative pressure suction force in the avoidance groove 650 on the flexible sheet, in the present embodiment, the avoidance groove 650 is arranged at a position close to the end of the diversion groove 610, that is, the avoidance groove 650 passes through from the position of the end of the diversion groove 610.

[0059] In addition, it should also be pointed out that, as Figure 6As shown, the surface defect identification device provided by the embodiment includes two conveying devices, the conveying belts of the two conveying devices are a first conveying belt 240 and a second conveying belt 250 respectively, a part of the second conveying belt 250 is located above the first conveying belt 240, the conveying directions of the first conveying belt 240 and the second conveying belt 250 are the same, so as to realize the staggering of the first conveying belt 240 and the second conveying belt 250, and the first belt surface 210 on the first conveying belt 240 for conveying the flexible sheet is arranged opposite to the first belt surface 210 on the second conveying belt 250 for conveying the flexible sheet. In addition, each conveying device is provided with a negative pressure air bellow 700 and a support plate 600, that is, the negative pressure air bellow 700 is arranged below the first conveying belt 240, the second negative pressure air bellow 700 is arranged above the second conveying belt 250, the support plate 600 is fixed between the negative pressure air bellow 700 of the first conveying belt 240 and the first conveying belt 240, and the support plate 600 is fixed between the negative pressure air bellow 700 of the second conveying belt 250 and the second conveying belt 250. In addition, the camera 300 includes a first camera 310 and a second camera 320. The first camera 310 is arranged above the first conveying belt 240 and faces the support plate 600 on the first conveying belt 240. The second camera 320 is arranged below the second conveying belt 250 and faces the support plate 600 on the second conveying belt 250. The conveying device with the first conveying belt 240 can cooperate with the first camera 310 to complete the defect detection on the upper surface of the flexible sheet, and the conveying device with the second conveying belt 250 can cooperate with the second camera 320 to complete the defect detection on the lower surface of the flexible sheet and the conveying of the flexible sheet along the second conveying belt 250. In this way, the surface defect detection on the upper surface and the lower surface of the flexible sheet is realized.

[0060] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

Claims

1. A conveying device, characterized in that, include: Rack (100); A conveyor belt (200) is movably mounted on the frame (100). The conveyor belt (200) has a first belt surface (210) for conveying flexible sheets and a second belt surface (220) opposite to the first belt surface (210). A group of air holes is distributed on the first belt surface (210). The group of air holes includes a plurality of first air holes (230). The plurality of first air holes (230) in the group of air holes are evenly spaced along the conveying direction of the conveyor belt (200). The first air holes (230) penetrate the first belt surface (210) and the second belt surface (220). A support plate (600) is fixed on the frame (100). The support plate (600) has a first plate surface, which is a plane. The first plate surface is attached to the second belt surface (220). A group of diversion grooves (610) corresponding to the air hole group is provided on the first plate surface. The group of diversion grooves (610) includes multiple diversion grooves (610). The multiple diversion grooves (610) in the group of diversion grooves (610) are arranged at intervals on the support plate (600) along the conveying direction of the conveyor belt (200). Each diversion groove (610) has at least one second air hole (620) at the bottom or wall of the groove. The opening of the diversion groove (610) is connected to the first air hole (230) passing through the opening of the diversion groove (610). In this process, the length direction of each of the diversion channels (610) is parallel to the conveying direction, the distance between two adjacent diversion channels (610) in the same diversion channel (610) group is less than the diameter of the first air hole (230), and the length of the diversion channel (610) is greater than the center distance between two adjacent air holes in the air hole group.

2. The conveying device according to claim 1, characterized in that, The air hole group is a multiple group, and the multiple air hole groups are distributed at intervals along the direction perpendicular to the conveying direction. The diversion groove (610) group is a multiple group, and the multiple diversion groove (610) groups are distributed at intervals along the direction perpendicular to the conveying direction. Each group of diversion grooves (610) groups corresponds to a group of air holes.

3. The conveying device according to claim 2, characterized in that, The diversion channels (610) in the adjacent diversion channel (610) group are staggered.

4. The conveying device according to claim 3, characterized in that, The projected portions of the diversion channel (610) overlap in a direction perpendicular to the conveying direction.

5. The conveying device according to claim 1, characterized in that, The second air hole (620) is located at the center of the bottom of the diversion channel (610).

6. The conveying device according to any one of claims 1-5, characterized in that, A bellows (700) is provided between the support plate (600) and the frame (100). The bellows (700) is fixed on the frame (100), and the support plate (600) is fixed on the bellows (700). All the second air holes (620) on the support plate (600) are connected to the bellows (700) cavity inside the bellows (700).

7. A surface defect identification device, characterized in that, Includes a camera (300) and a conveying device according to any one of claims 1-6, wherein the camera (300) and the support plate (600) are respectively located on the first belt surface (210) side and the second belt surface (220) side of the conveyor belt (200), and the shooting direction of the camera (300) is towards the support plate (600).

8. The surface defect identification device according to claim 7, characterized in that, The first surface of the support plate (600) and the interior of the diversion groove (610) are coated with a black coating.

9. The surface defect identification device according to claim 8, characterized in that, An avoidance groove (650) is provided on the first plate surface. The avoidance groove (650) has a first inclined surface (640). The first inclined surface (640) is arranged in a direction perpendicular to the conveying direction. The shooting direction of the camera (300) is facing the first inclined surface (640). The first inclined surface (640) is coated with a black coating.

10. The surface defect identification device according to claim 7, characterized in that, The conveyor belt includes a first conveyor belt (240) and a second conveyor belt (250). A portion of the second conveyor belt (250) is located above the first conveyor belt (240). The support plate (600) is provided both below the first conveyor belt (240) and above the second conveyor belt (250).

Images