Conveying device and surface defect detection device

Abstract

The present application discloses a conveying device and a surface defect detection device, which belong to the technical field of flexible sheet conveying equipment. The conveying device uses a first negative pressure body fixed below the first conveyor belt to absorb and flatten the lower surface of the flexible sheet, so as to facilitate the detection of the upper surface of the flexible sheet, and uses a second negative pressure body fixed above the second conveyor belt to absorb and flatten the upper surface of the flexible sheet, and cooperates with the second conveyor belt to realize the transportation of the flexible sheet, and at the same time, it can also conveniently detect the lower surface of the flexible sheet. In addition, the first negative pressure body located between the first negative pressure body and the second negative pressure body and fixed below the first conveyor belt absorbs the lower surface of the flexible sheet, so that the flexible sheet can enter the gap between the first conveyor belt and the second conveyor belt, avoiding the situation where the flexible sheet cannot enter the gap after curling. There is no need to flip the flexible sheet during the entire conveying process, and the flexible sheet will not be damaged by creases or breaks due to deformation.

Description

Technical Field

[0001] The present application belongs to the technical field of flexible sheet conveying equipment, and in particular relates to a conveying device and a surface defect detection device. Background Art

[0002] During the PCB manufacturing process, flexible sheet materials such as PP, copper foil, or CCL boards must be inspected for surface defects to screen out defective products that meet standard standards. This inspection is typically performed using a CCD camera.

[0003] The patent application number 201822184722.3 discloses a double-sided visual inspection device for workpieces. By setting up two conveyor belts, a flipping device is used to flip the workpiece 180° from one conveyor belt to the other conveyor belt. The first and second CCD cameras are used on the first conveyor belt to detect the surface and sides of the workpiece, and the third CCD camera is used on the second conveyor belt to detect the back of the workpiece. This setting can not only perform all-round inspection of the surface of the workpiece, but also the conveyor belt can work continuously without stopping, thereby improving the efficiency of production inspection.

[0004] However, if the device is used to transport the flexible sheet, the flexible sheet is likely to be creased or broken due to deformation during the turning process, so that the flexible sheet is detected as a defective product by the third CCD camera. Summary of the Invention

[0005] The present application aims to at least partially resolve the technical problem that current visual inspection devices, when turning over flexible sheets during conveying, can cause the flexible sheets to be deformed, creased, or broken. To this end, the present application provides a conveying device and a surface defect detection system.

[0006] An embodiment of the present application provides a method for conveying a flexible sheet material, comprising:

[0007] a first conveying mechanism, the first conveying mechanism comprising a first conveying belt, a first negative pressure body being fixed below the first conveying belt;

[0008] The second conveying mechanism comprises a second conveying belt, a portion of the second conveying belt is located directly above the first conveying belt, a second negative pressure body is fixed above the second conveying belt, and at least a portion of the second negative pressure body is located directly above the first conveying belt; wherein,

[0009] A third negative pressure body is also fixed under the first conveyor belt. Along the conveying direction of the flexible sheet, the third negative pressure body is located between the first negative pressure body and the second negative pressure body. When any flexible sheet enters under the second conveyor belt, the third negative pressure body is closed.

[0010] Optionally, in order to better implement the present application, an identification device is provided on the first conveying mechanism and / or the second conveying mechanism, and the identification device controls the start and stop of the third negative pressure body. When the identification device identifies the flexible sheet entering under the second conveyor belt, the third negative pressure body is closed.

[0011] Optionally, in order to better implement the present application, along the conveying direction of the flexible sheet, the identification device is located between the second negative pressure body and the third negative pressure body.

[0012] Optionally, in order to better implement the present application, a guide member is provided on the second conveying mechanism, and the guide member has a guide surface. The front end of the guide surface is located directly above the third negative pressure body, and the tail end of the guide surface is connected to the second conveyor belt or the tail end of the guide surface is arranged below the second conveyor belt.

[0013] Optionally, in order to better implement the present application, the guide surface includes a first guide surface and a second guide surface, the rear end of the first guide surface is connected to the front end of the second guide surface, the front end of the first guide surface is higher than the rear end of the first guide surface, and the second guide surface is parallel to the first conveyor belt.

[0014] Optionally, in order to better implement the present application, the distance between the first conveyor belt and the second conveyor belt is adjustable.

[0015] Optionally, in order to better implement the present application, the conveying device includes a frame, the first conveying mechanism is fixed on the frame, the frame is provided with a first adjustment mechanism for adjusting the height of the second conveying mechanism, and the second conveying mechanism is fixed on the first adjustment mechanism.

[0016] Optionally, in order to better implement the present application, the distance between the third negative pressure body and the first conveyor belt is adjustable.

[0017] Optionally, in order to better implement the present application, the third negative pressure body is supported on the lower surface of the first conveyor belt.

[0018] A surface defect detection device includes the above-mentioned conveying device, and a first camera and a second camera, wherein the first camera is arranged above the first conveyor belt and faces the first negative pressure body, and the second camera is arranged below the second conveyor belt and faces the second negative pressure body.

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

[0020] The present application uses a first negative pressure body fixed below the first conveyor belt to adsorb the lower surface of the flexible sheet to flatten the flexible sheet, so as to facilitate the detection of the upper surface of the flexible sheet, and uses a second negative pressure body fixed above the second conveyor belt to adsorb the upper surface of the flexible sheet, and cooperates with the second conveyor belt to realize the transportation of the flexible sheet, and at the same time, it can also conveniently detect the lower surface of the flexible sheet. In addition, the first negative pressure body located between the first negative pressure body and the second negative pressure body and fixed below the first conveyor belt adsorbs and flattens the lower surface of the flexible sheet, so that the flexible sheet can smoothly enter the gap between the first conveyor belt and the second conveyor belt, avoiding the situation where the flexible sheet cannot enter the gap due to curling. There is no need to flip the flexible sheet during the entire transportation process, and the flexible sheet will not be damaged by creases or breaks due to deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 A schematic diagram of a three-dimensional structure of a surface defect detection device is shown;

[0023] Figure 2 Shown Figure 1 The main view;

[0024] Figure 3 Shown Figure 1 Schematic diagram of the conveying device structure and the position of the camera;

[0025] Figure 4 Shown Figure 1 Schematic diagram of the three-dimensional structure of the conveying device;

[0026] Figure 5 Shown Figure 3 A local enlarged view of point A;

[0027] Figure 6 Shown Figure 3 A schematic diagram of an installation position of the first negative pressure body, the second negative pressure body and the third negative pressure body;

[0028] Figure 7 Shown Figure 3 Schematic diagram of the state of the flexible sheet after the third negative pressure body is closed.

[0029] Reference numerals:

[0030] 100 - first conveying mechanism; 110 - first conveyor belt; 111 - first air hole; 120 - first driving mechanism; 130 - first negative pressure body; 140 - third negative pressure body; 141 - identification device;

[0031] 200 - second conveying mechanism; 210 - second conveyor belt; 211 - second air hole; 220 - second driving mechanism; 230 - second negative pressure body; 240 - guide member; 241 - first guide surface; 242 - second guide surface; 250 - second bracket; 260 - adjustment assembly; 261 - adjustment bolt; 262 - spacer;

[0032] 300-rack;

[0033] 400-first camera;

[0034] 500-Second camera. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship and movement status of various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The present application is described below with reference to specific embodiments and with reference to the accompanying drawings:

[0040] The present embodiment provides a conveying device for conveying flexible sheets, which can be used for example Figure 1 In the surface defect detection device shown, the first camera 400 and the second camera 500 in the surface defect detection device are used in the process of conveying the flexible sheet to complete the identification of defects on the upper and lower surfaces of the flexible sheet without turning the flexible sheet over.

[0041] Specifically, the structure of the conveying device in this embodiment is as follows: Figure 2 、 Figure 3 and Figure 4 As shown, it includes a first conveying mechanism 100 , a second conveying mechanism 200 , a first negative pressure body 130 and a second negative pressure body 230 .

[0042] The first conveying mechanism 100 includes a first conveyor belt 110 and a first drive mechanism 120 that drives the first conveyor belt 110 in a circular motion. The conveying structure of the first conveyor mechanism 100 can be a pulley mechanism or a chain mechanism. The conveying direction of the first conveyor belt 110 is linear. The first conveyor belt 110 is provided with first air holes 111. The first air holes 111 can be holes formed in the belt of a pulley mechanism or holes formed in the chain of a chain mechanism. The flexible sheet material is moved along the conveying direction of the first conveyor belt 110 under the conveying action of the first conveyor belt 110. In this embodiment, the flexible sheet material conveyed by the conveying device is a flexible sheet material used for PCB boards. Therefore, the first conveyor belt 110 in the first conveying mechanism 100 is arranged horizontally so that the surface of the first conveyor belt 110 that supports the flexible sheet material is also horizontal, thereby reducing the relative displacement of the flexible sheet material between the first conveyor belt 110 and the first conveyor belt 110 during conveyance. Of course, it should be noted that in some optional embodiments, if the weight of the flexible sheet transported by the conveying device is heavy, the first conveyor belt 110 can be set at an angle, and the friction between the flexible sheet and the first conveyor belt 110 can be used to reduce the relative offset of the flexible sheet between the first conveyor belt 110 and the first conveyor belt 110 during the conveyance process of the first conveyor belt 110.

[0043] The first negative pressure body 130 is fixed below the first conveyor belt 110. Specifically, the upper surface of the first negative pressure body 130 faces the first conveyor belt 110. The first negative pressure body 130 is capable of generating negative pressure, which forms a first negative pressure area on the upper surface of the first conveyor belt 110 after passing through the first air holes 111. The flexible sheet material will pass through the first negative pressure area under the conveyance of the first conveyor belt 110, and the portion of the flexible sheet material located in the first negative pressure area will adhere to the upper surface of the first conveyor belt 110 under the action of the negative pressure, thereby keeping the flexible sheet material flat at least within the first area, so that the first camera 400 can take pictures of the flattened upper surface of the flexible sheet material, thereby identifying and detecting surface defects of the flexible sheet material.

[0044] The second conveying mechanism 200 includes a second conveyor belt 210 and a second drive mechanism 220 that drives the second conveyor belt 210 in a circular motion. In this embodiment, the second conveying mechanism 200 and the first conveying mechanism 100 utilize the same conveying structure. A portion of the second conveyor belt 210 is positioned above the first conveyor belt 110 to connect with the first conveyor belt 110. The conveying direction of the second conveyor belt 210 is linear. A gap is provided between the first and second conveyor belts 110, allowing the flexible sheet to enter. The second conveyor belt 210 is provided with second air holes 211 and is disposed horizontally. The conveying direction of the flexible sheet on the first conveyor belt 110 and the conveying direction of the flexible sheet on the second conveyor belt 210 together constitute the conveying direction of the flexible sheet. In this embodiment, the conveying direction of the flexible sheet is linear. In some alternative embodiments, the conveying method of the flexible sheet may be a zigzag direction, where the conveying directions of the first conveyor belt 110 and the second conveyor belt 210 are not aligned, for example, they may be perpendicular to each other within the same plane.

[0045] The second negative pressure body 230 is fixed above the first conveyor belt 110. After the negative pressure generated by the second negative pressure body 230 passes through the second air hole 211, a second negative pressure area is formed on the lower surface of the second conveyor belt 210, and the second negative pressure area at least covers the tail end of the first conveyor belt 110, so that the flexible sheet on the first conveyor belt 110 will enter the second negative pressure area when it reaches the tail end of the first conveyor belt 110, so that the flexible sheet is adsorbed on the second conveyor belt 210 under the action of the second negative pressure body 230 and separated from the first conveyor belt 110, thereby realizing the transition of the flexible sheet from the first conveyor belt 110 to the second conveyor belt 210, and then moves along the conveying direction of the second conveyor belt 210 under the joint action of the second conveyor belt 210 and the second negative pressure body 230, thereby completing the transportation of the flexible sheet on the second conveyor belt 210. After the second negative pressure body 230 adsorbs the flexible sheet onto the second conveyor belt 210, the flexible sheet can also be flatly adhered to the second conveyor belt 210 under the action of the second negative pressure body 230, so that the second camera 400 can take pictures of the lower surface of the flattened flexible sheet, thereby identifying and detecting surface defects of the flexible sheet.

[0046] Through the above-mentioned first conveying mechanism 100, second conveying mechanism 200, first negative pressure body 130 and second negative pressure body 230, the flexible sheet can be conveyed while cooperating with the first camera 400 and the second camera 500 to complete the defect detection on the upper and lower surfaces of the flexible sheet.

[0047] The inventors have discovered through research that when only the above-mentioned conveying device is used to convey the flexible sheet, if the distance between the first negative pressure body 130 and the second negative pressure body 230 is relatively far, the flexible sheet will not immediately enter the second negative pressure area formed by the second negative pressure body 230 after passing through the first negative pressure area formed by the first negative pressure body 130. This will cause some flexible sheets with curled edges to return to the curled edge phenomenon after leaving the first negative pressure area, thereby changing the shape of the flexible sheet edge due to curling, resulting in the flexible sheet being unable to pass through the gap between the first conveyor belt 110 and the second conveyor belt 210, and thus unable to be transferred from the first conveyor belt 110 to the second conveyor belt 210, affecting the normal operation of the entire conveyor device. At the same time, after the curled flexible sheet is adsorbed on the second conveyor belt 210 by the second negative pressure body 230, the flexible sheet cannot be laid flat on the second conveyor belt 210 due to the curled area, which leads to subsequent detection of defects on the lower surface of the flexible sheet. In addition, if the interval between the first negative pressure body 130 and the second negative pressure body 230 is set closer, the flexible sheet can immediately enter the second negative pressure area after leaving the first negative pressure area. Although this can avoid the above-mentioned problems caused by the curling of the flexible sheet, it will cause the flexible sheet to suddenly deform during the transition from the first conveyor belt 110 to the second conveyor belt 210, thereby causing stress concentration in the flexible sheet and causing irremovable creases to appear on the surface of the flexible sheet. More seriously, the flexible sheet will be broken, causing the flexible sheet to become a defective product due to creases or breaks.

[0048] In addition, since the first negative pressure body 130 needs to flatten the flexible sheet for the camera to shoot the upper surface of the flexible sheet, and the second negative pressure body 230 needs to flatten the flexible sheet for the camera to shoot the lower surface of the flexible sheet, during the use of the conveying device, neither the first negative pressure body 130 nor the second negative pressure body 230 can be closed.

[0049] In view of this, combined with Figure 3 and Figure 5The structure of the conveying device provided in this embodiment also includes a third negative pressure body 140, which is fixed below the first conveyor belt 110. Specifically, the upper surface of the third negative pressure body 140 faces the first conveyor belt 110. The third negative pressure body 140 can generate negative pressure, which forms a third negative pressure area on the upper surface of the first conveyor belt 110 after passing through the first air hole 111. The flexible sheet will pass through the third negative pressure area under the conveying action of the first conveyor belt 110, and the portion of the flexible sheet located in the third negative pressure area will adhere to the upper surface of the first conveyor belt 110 under the action of the negative pressure. Along the conveying direction of the flexible sheet, the third negative pressure body 140 is located between the first negative pressure body 130 and the second negative pressure body 230, so that the third negative pressure area is located between the first negative pressure area and the second negative pressure area. During the process of moving along the conveying direction, the flexible sheet will sequentially enter the first negative pressure area, the third negative pressure area, and the second negative pressure area. The third negative pressure area and the first negative pressure area can be separated from each other or partially overlap.

[0050] The third negative pressure body 140 is a negative pressure body that opens and closes intermittently, that is, the opening and closing of the third negative pressure body 140 is controllable. When the third negative pressure body 140 is closed, the third negative pressure body 140 does not generate an adsorption force on the upper surface of the first conveyor belt 110. When the third negative pressure body 140 is opened, the third negative pressure body 140 generates an adsorption force on the upper surface of the first conveyor belt 110. The opening and closing of the third negative pressure body 140 can be controlled manually, or it can be set accordingly according to the conveying rhythm of the flexible sheet. In this embodiment, the closing condition of the third negative pressure body 140 is that when a certain flexible sheet enters under the second conveyor belt 210, the third negative pressure body 140 is closed until the flexible sheet passes through the third negative pressure area formed by the third negative pressure body 140, and then the third negative pressure body 140 can be opened to wait for the next flexible sheet to enter the third negative pressure area. To meet this opening and closing condition, the spacing distance between two adjacent flexible sheets on the first conveyor belt 110 needs to be greater than the length of the third negative pressure body 140 along the conveying direction of the flexible sheet. On the other hand, the spacing distance between two adjacent flexible sheets on the first conveyor belt 110 needs to be greater than the covering length of the third negative pressure area along the conveying method.

[0051] By setting the third negative pressure body 140 between the first negative pressure body 130 and the second negative pressure body 230, it is possible to ensure that the first negative pressure body 130 and the second negative pressure body 230 are spaced at a greater distance from each other, and at the same time, the third negative pressure body 140 and the second negative pressure body 230 are at a smaller distance. With this arrangement, when the flexible sheet is being transported on the conveying device, the flexible sheet will first pass through the first negative pressure body 130 and the first negative pressure area formed by the first negative pressure body 130, and cooperate with the camera to complete the defect detection on the upper surface of the flexible sheet, and then the flexible sheet will enter the third negative pressure area formed by the third negative pressure body 140. At this time, the third negative pressure body 140 has been opened. Under the action of the third negative pressure body 140, the curled part of the flexible sheet is in contact with the first conveyor belt 110, so that the flexible sheet can smoothly enter the first conveyor belt 110. 0 and the second conveyor belt 210, when the flexible sheet enters between the first conveyor belt 110 and the second conveyor belt 210, the third negative pressure body 140 is closed, and then the flexible sheet is subjected to the adsorption force of the second negative pressure body 230, so that one end of the flexible sheet is adsorbed on the second conveyor belt 210, and the other end of the flexible sheet is no longer subjected to the adsorption force of the third negative pressure body 140, and naturally droops under the action of gravity. If the flexible sheet is long enough, the other end of the flexible sheet can still be overlapped on the first conveyor belt 110. Since there is a sufficient distance between the first negative pressure body 130 and the second negative pressure body 230, the flexible sheet can smoothly transition from the first conveyor belt 110 to the second conveyor belt 210. The bending angle of the flexible sheet is small, which avoids the flexible sheet being subjected to the downward adsorption force of the third negative pressure body 140 and the upward adsorption force of the second negative pressure body 230 at the same time. In addition, the distance between the third negative pressure body 140 and the second negative pressure body 230 is too small, which makes the bending angle of the flexible sheet larger, causing sudden deformation of the flexible sheet and resulting in creases or breakage.

[0052] Furthermore, in this embodiment, the opening and closing of the third negative pressure body 140 is identified and controlled by an identification device 141. Specifically, the first conveying mechanism 100 and / or the second conveying mechanism 200 is provided with an identification device 141. The identification device 141 is electrically connected to the solenoid valve or negative pressure pump corresponding to the third negative pressure body 140, so that the identification device 141 can control the start and stop of the third negative pressure body 140. Specifically, when the identification device 141 identifies that the flexible sheet has reached below the second conveyor belt 210, that is, when the flexible sheet enters the gap between the first conveyor belt 110 and the second conveyor belt 210, the identification device 141 controls the third negative pressure body 140 to close. When the identification device 141 does not identify the flexible sheet, the identification device 141 controls the third negative pressure body 140 to start.

[0053] It should be noted that the identification device 141 in this embodiment comprises a photoelectric sensor and a controller. The photoelectric sensor is connected to the controller, which is electrically connected to the solenoid valve or negative pressure pump of the third negative pressure body 140. The photoelectric sensor identifies the flexible sheet and controls the start / stop of the third negative pressure body 140. Because the flexible sheet in the PCB is relatively light, the identification device 141 consisting of a photoelectric sensor and a controller is suitable. Alternatively, the identification device 141 may be a combination of a piezoelectric sensor and a controller, or an ultrasonic sensor and a controller.

[0054] Furthermore, in this embodiment, along the conveying direction of the flexible sheet, the identification device 141 is located between the second negative pressure body 230 and the third negative pressure body 140, and the identification position of the identification device 141 is also located between the second negative pressure body 230 and the third negative pressure body 140. Preferably, the identification position of the identification device 141 is located between the second negative pressure area and the third negative pressure area. When the identification device 141 identifies the flexible sheet, the flexible sheet must not reach the position of the third negative pressure body 140, nor reach the third negative pressure area of ​​the third negative pressure body 140, thereby preventing the flexible sheet from being subjected to the adsorption forces of the third negative pressure body 140 and the second negative pressure body 230 at the same time.

[0055] Further, combined Figure 3 and Figure 5 As shown, the second conveying mechanism 200 is also provided with a guide member 240, which has a guide surface. The guide surface is located above the first conveyor belt 110 and faces the first conveyor belt 110. The front and rear ends of the guide surface are arranged along the conveying direction of the flexible sheet material, and the front end of the guide surface is located directly above the third negative pressure body 140, and the rear end of the guide surface is in contact with the second conveyor belt 210 or is arranged below the second conveyor belt 210. The gap between the guide surface and the first conveyor belt 110 is used for the flexible sheet material to enter. After the guide member 240 is provided, the flexible sheet material can quickly enter the gap between the guide surface and the first conveyor belt 110 after being subjected to the adsorption force of the third negative pressure body 140, so that the flexible sheet material can smoothly transition into the gap between the first conveyor belt 110 and the second conveyor belt 210, and avoid the flexible sheet material from entering from the edge of the third negative pressure body 140.

[0056] After the guide member 240 is installed, the third negative-pressure body 140 only needs to be located between the first negative-pressure body 130 and the third negative-pressure body 140. If the guide member 240 is not installed, the third negative-pressure body 140 must also be located so that at least a portion of the third negative-pressure body 140 is directly below the second conveyor belt 210. In other words, at least a portion of the third suction area of ​​the third negative-pressure body 140 is located in the gap between the first conveyor belt 110 and the second conveyor belt 210.

[0057] Specifically, the guide member 240 includes a first guide surface 241 and a second guide surface 242. Both the first guide surface 241 and the second guide surface 242 are smooth planes. The rear end of the first guide surface 241 and the front end of the second guide surface 242 are connected by an arc transition to prevent the curling angle of the flexible sheet from increasing at the corner between the first guide surface 241 and the second guide surface 242. The front end of the first guide surface 241 is higher than the rear end of the first guide surface 241, and the second guide surface 242 is parallel to the first conveyor belt 110.

[0058] Furthermore, the distance between the guide 240 and the first conveyor belt 110 is adjustable, and flexible sheets of different thicknesses can be accommodated by adjusting the position of the guide 240. In this embodiment, the guide 240 and the second conveying mechanism 200 achieve height adjustment of the guide 240 through the cooperation of waist-shaped grooves and bolts.

[0059] Furthermore, the spacing between the first conveyor belt 110 and the second conveyor belt 210 is adjustable. By adjusting the spacing between the first conveyor belt 110 and the second conveyor belt 210, on the one hand, flexible sheets of different thicknesses can pass through the gap between the first conveyor belt 110 and the second conveyor belt 210; on the other hand, since the second negative pressure body 230 needs to suck the flexible sheet upward, by adjusting the spacing between the first conveyor belt 110 and the second conveyor belt 210, the second negative pressure body 230 can also have sufficient suction force on the flexible sheet.

[0060] Furthermore, in this embodiment, the conveying device includes a frame 300, to which the first conveying mechanism 100 and the second conveying mechanism 200 are both fixed. The frame 300 is provided with a first adjustment mechanism for adjusting the height of the second conveying mechanism 200, and the second conveying mechanism 200 is fixed to the first adjustment mechanism. The overall height of the second conveying mechanism 200 is adjusted by the first adjustment mechanism to adjust the distance between the second conveyor belt 210 and the first conveyor belt 110.

[0061] Specifically, the second conveying mechanism 200 includes a second bracket 250, the second conveyor belt 210 and the second driving mechanism 220 are both fixed on the second bracket 250, the first adjustment mechanism includes at least four adjustment components 260, and the at least four adjustment components 260 are symmetrically arranged on both sides of the second bracket 250. Each adjustment component 260 includes an adjustment bolt 261 and a pad 262. The adjustment bolt 261 is passed through the second bracket 250, and the threaded end of the adjustment bolt 261 is threadedly connected to the frame, and the pad 262 can be removably placed between the second bracket 250 and the frame. The pads 262 have various thicknesses, and pads 262 of varying thicknesses are selected based on the thickness of the flexible sheet. After the pads 262 are placed between the second bracket 250 and the frame, the adjustment bolts 261 are tightened to clamp the pads 262 therebetween, thereby adjusting the overall height of the second conveying mechanism 200. The pads 262 can support the overall weight of the second conveying mechanism 200, thereby increasing the service life of the conveying device. Of course, in some alternative embodiments, the first adjustment mechanism of other components, such as a shear lift assembly or a telescopic cylinder assembly, may also be used to adjust the overall height of the second conveying mechanism 200.

[0062] It should be noted that, in this embodiment, the second negative pressure body 230 is connected to the second bracket 250 on which the second conveying mechanism 200 is mounted, so that the second negative pressure body 230 can move integrally with the second conveyor belt 210 .

[0063] Furthermore, the distance between the third negative pressure body 140 and the first conveyor belt 110 is adjustable. By adjusting the gap between the third negative pressure body 140 and the first conveyor belt 110, the adsorption force of the third negative pressure body 140 on the flexible sheet on the first conveyor belt 110 can be adjusted. When the distance between the third negative pressure body 140 and the first conveyor belt 110 increases, the adsorption force of the third negative pressure body 140 on the flexible sheet entering the third negative pressure area decreases. When the distance between the third negative pressure body 140 and the first conveyor belt 110 decreases, the adsorption force of the third negative pressure body 140 on the flexible sheet entering the third negative pressure area increases.

[0064] Preferably, the third negative pressure body 140 is supported on the lower surface of the first conveyor belt 110 so that the third negative pressure body 140 is in contact with the lower surface of the first conveyor belt 110. On the one hand, this can reduce the loss of adsorption force after the third negative pressure body 140 is activated, thereby improving the adsorption effect on the flexible sheet. On the other hand, the third negative pressure body 140 can also support the first conveyor belt 110, reducing the swing amplitude of the third conveyor belt after it becomes loose.

[0065] Based on the above-mentioned conveying device, the embodiment of the present application further provides a surface defect detection device, an implementation structure of the surface defect detection device is as follows Figures 1 to 3As shown, the device for detecting surface defects of a flexible sheet material includes the above-mentioned conveying device and a first camera 400 and a second camera 500. The conveying device is used to convey the flexible sheet material, and the first negative pressure body 130 in the conveying device is used to adsorb the flexible sheet material entering the first negative pressure area onto the first conveyor belt 110 to achieve the purpose of leveling the flexible sheet material. The second negative pressure body 230 in the conveying device is used to adsorb the flexible sheet material onto the second conveyor belt 210, and cooperate with the second conveyor belt 210 to complete the conveying of the flexible sheet material. At the same time, the second negative pressure body 230 also serves to level the flexible sheet material. The first camera 400 is arranged above the first conveyor belt 110 and faces the first negative pressure body 130. Specifically, the first camera 400 faces the position of the first conveyor belt 110 corresponding to the first negative pressure body 130, takes a picture of the flexible sheet material adsorbed by the first negative pressure body 130, and analyzes the taken picture through an image processor (not shown in the figure) to detect surface defects on the upper surface of the flexible sheet material. The second camera 500 is arranged below the second conveyor belt 210 and faces the second negative pressure body 230. Specifically, the second camera 500 faces the position of the second conveyor belt 210 corresponding to the second negative pressure body 230 to take pictures of the lower surface of the flexible sheet and detect surface defects on the upper surface of the flexible sheet through the image processor.

[0066] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

Claims

1. A conveying device for conveying flexible sheets, characterized in that: include: A first conveying mechanism (100), the first conveying mechanism (100) having a first conveying belt (110), a first negative pressure body (130) being fixed below the first conveying belt (110); A second conveying mechanism (200), wherein the second conveying mechanism (200) has a second conveyor belt (210), a portion of the second conveyor belt (210) is located directly above the first conveyor belt (110), a second negative pressure body (230) is fixed above the second conveyor belt (210), and at least a portion of the second negative pressure body (230) is located directly above the first conveyor belt (110); wherein, A third negative pressure body (140) is also fixed below the first conveyor belt (110). Along the conveying direction of the flexible sheet, the third negative pressure body (140) is located between the first negative pressure body (130) and the second negative pressure body (230). When any flexible sheet enters below the second conveyor belt (210), the third negative pressure body (140) is closed.

2. A conveying device according to claim 1, characterized in that: The first conveying mechanism (100) and / or the second conveying mechanism (200) is provided with an identification device (141), and the identification device (141) controls the start and stop of the third negative pressure body (140). When the identification device (141) identifies the flexible sheet entering under the second conveyor belt (210), the third negative pressure body (140) is closed.

3. A conveying device according to claim 2, characterized in that: Along the conveying direction of the flexible sheet, the identification device (141) is located between the second negative pressure body (230) and the third negative pressure body (140).

4. A conveying device according to claim 1, characterized in that: The second conveying mechanism (200) is provided with a guide member (240), and the guide member (240) has a guide surface, the front end of the guide surface is located directly above the third negative pressure body (140), and the tail end of the guide surface is connected to the second conveying belt (210) or the tail end of the guide surface is arranged below the second conveying belt (210).

5. A conveying device according to claim 4, characterized in that: The guide surface comprises a first guide surface (241) and a second guide surface (242), the rear end of the first guide surface (241) is connected to the front end of the second guide surface (242), the front end of the first guide surface (241) is higher than the rear end of the first guide surface (241), and the second guide surface (242) is parallel to the first conveyor belt (110).

6. A conveying device according to claim 1, characterized in that: The distance between the first conveyor belt (110) and the second conveyor belt (210) is adjustable.

7. A conveying device according to claim 6, characterized in that: The conveying device comprises a frame (300), the first conveying mechanism (100) is fixed on the frame (300), a first adjustment mechanism for adjusting the height of the second conveying mechanism (200) is provided on the frame (300), and the second conveying mechanism (200) is fixed on the first adjustment mechanism.

8. A conveying device according to claim 1, characterized in that: The distance between the third negative pressure body (140) and the first conveyor belt (110) is adjustable.

9. A conveying device according to claim 6, characterized in that: The third negative pressure body (140) is supported on the lower surface of the first conveyor belt (110).

10. A surface defect detection device, characterized in that: The invention comprises the conveying device according to any one of claims 1 to 9, and a first camera (400) and a second camera (500), wherein the first camera (400) is arranged above the first conveyor belt (110) and faces the first negative pressure body (130), and the second camera (500) is arranged below the second conveyor belt (210) and faces the second negative pressure body (230).

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