CN116654672A - Conveying device and surface defect detection device - Google Patents

Abstract

The application discloses a conveying device and a surface defect detection device, and belongs to the technical field of printed circuit manufacturing equipment. The conveying device comprises a first conveying mechanism and a second conveying mechanism, a part of a second conveying belt of the second conveying mechanism is positioned above the first conveying belt of the first conveying mechanism and forms a gap, a first negative pressure body fixed below the first conveying belt is used for matching with a first camera to finish defect detection on the upper surface of the flexible sheet, and a second negative pressure body fixed above the second conveying belt is used for matching with the second conveying belt to finish conveying the flexible sheet and matching with a second camera to finish defect detection on the lower surface of the flexible sheet. The third negative pressure body arranged below the first conveying belt enables the flexible sheet to enter the gap more easily, the positive pressure body arranged below the first conveying belt enables the flexible sheet to be lifted in advance, the flexible sheet is absorbed on the second conveying belt more easily by the second negative pressure body, and the rising bending angle of the flexible sheet can be slowed down.

Description

Conveying device and surface defect detection device

Technical Field

The application belongs to the technical field of printed circuit manufacturing equipment, and particularly relates to a conveying device and a surface defect detection device.

Background

Before the flexible sheet is put into use, two opposite surfaces of the flexible sheet are required to be detected so as to screen out defective products with surface defects in the flexible sheet. For the surface defect detection of flexible sheets, most of them are done by means of a CCD camera.

The patent with the application number of 201822184722.3 discloses a double-sided visual detection device for workpieces, two conveyor belts are arranged, the workpieces are turned over by 180 degrees from one conveyor belt to the other conveyor belt by using a turning device, the surfaces and the side surfaces of the workpieces are detected by using a first CCD camera and a second CCD camera on a first conveyor belt, the back surfaces of the workpieces are detected by using a third CCD camera on a second conveyor belt, so that the surfaces of the workpieces can be detected in all directions by the aid of the device, the conveyor belts can work continuously, no pause is needed, and the production detection efficiency is improved.

However, when the flexible sheet is conveyed by this apparatus, the flexible sheet is easily creased or broken by deformation during the turning process, and the flexible sheet is detected as defective by the third CCD camera.

Disclosure of Invention

The application aims to at least solve the technical problem that the flexible sheet is folded or broken and damaged due to deformation when the flexible sheet is overturned in the process of conveying the flexible sheet by the conventional visual inspection device to a certain extent. To this end, the present application provides a conveying device and a surface defect detecting device.

An embodiment of the present application provides a conveying apparatus for conveying a flexible sheet, including:

the first conveying mechanism is provided with a first conveying belt, and a first negative pressure body is fixed below the first conveying belt;

the second conveying mechanism is provided with a second conveying belt, a part of the second conveying belt is positioned above the first conveying belt, and a second negative pressure body is fixed above the second conveying belt; wherein,,

the flexible sheet conveying device is characterized in that a positive pressure body and a third negative pressure body are fixed below the first conveying belt, the first negative pressure body, the third negative pressure body, the positive pressure body and the second negative pressure body are sequentially arranged along the conveying direction of the flexible sheet, and at least one part of the third negative pressure body is located right below the second conveying belt.

Alternatively, in order to better implement the present application, at least a portion of the positive pressure body is located directly below the second negative pressure body.

Optionally, in order to better implement the present application, the conveying device further includes a recognition device electrically connected to the third negative pressure body, and when the recognition device recognizes that the end portion of the flexible sheet material enters between the third negative pressure body and the positive pressure body, the third negative pressure body is closed.

Alternatively, in order to better implement the present application, the identification device is provided between the third negative pressure body and the positive pressure body in the conveying direction of the flexible sheet.

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

Alternatively, in order to better implement the present application, the distance between the positive pressure body and the first conveyor belt may be adjustable.

Alternatively, in order to better implement the present application, the distance between the first conveyor belt and the second conveyor belt is adjustable.

Alternatively, in order to better implement the present application, the second conveying mechanism is provided with a guide member, the guide member has a guide surface, a front end of the guide surface is located directly above the third negative pressure body, and a tail end of the guide surface is abutted with the second conveying belt or a tail end of the guide surface is located below the second conveying belt.

Alternatively, 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.

The surface defect detection device comprises the conveying device, a first camera and a second camera, wherein the first camera is arranged above the first conveying surface and faces towards the first negative pressure body, and the second camera is arranged below the second conveying surface and faces towards the second negative pressure body.

Compared with the prior art, the application has the following beneficial effects:

the conveying device comprises a first conveying mechanism and a second conveying mechanism, wherein a part of a second conveying belt in the second conveying mechanism is positioned above a first conveying belt of the first conveying mechanism, the first conveying belt and the second conveying belt are arranged in a staggered mode to form a gap for the flexible sheet to enter, a first negative pressure body is fixed below the first conveying belt and used for flattening the flexible sheet and matched with a first camera to finish defect detection on the upper surface of the flexible sheet, a second negative pressure body is fixed above the second conveying belt and used for flattening and adsorbing the flexible sheet, defect detection on the lower surface of the flexible sheet is finished by matched with a second camera in the process of conveying the flexible sheet, at least a part of a third negative pressure body arranged below the first conveying belt is positioned below the second conveying belt so that after the flexible sheet is flattened, the flexible sheet is easier to enter the gap, and a positive pressure body arranged below the first conveying belt is used for flattening the flexible sheet after entering the gap, so that the flexible sheet is pre-bent and is easier to bend the flexible sheet on the second conveying belt, and on the other hand, the phenomenon that the flexible sheet is bent and the second negative pressure is easier to rise is reduced is caused.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a schematic structure of a surface defect detecting apparatus;

FIG. 2 shows a schematic view of the transport apparatus of FIG. 1;

FIG. 3 shows an enlarged view at A in FIG. 2;

FIG. 4 shows a front view of the first and second transport mechanisms of FIG. 2;

FIG. 5 shows a partial enlarged view at B in FIG. 3;

FIG. 6 illustrates a schematic view of a state in which a flexible sheet transitions from a first transport mechanism to a second transport mechanism;

FIG. 7 shows a schematic view of the area of action of the first negative pressure body, the second negative pressure body, and the positive pressure body;

fig. 8 shows another state schematic diagram of transition of the flexible sheet from the first conveying mechanism to the second conveying mechanism.

Reference numerals:

10-a conveying device; 20-a first camera; 30-a second camera;

100-a first conveying mechanism; 110-a first conveyor belt; 111-a first air hole; 120-a first drive mechanism; 130-a first negative pressure body; 140-a third negative pressure body; 141-identifying means; 150-positive pressure body; 160-a first bracket;

200-a second conveying mechanism; 210-a second conveyor belt; 211-second air holes; 220-a second drive mechanism; 230-a second negative pressure body; 240-a guide; 241-first guide surface; 242-a second guide surface; 250-a second scaffold;

300-frame.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all the directional indicators in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

The application is described below with reference to specific embodiments in conjunction with the accompanying drawings:

the application provides a surface defect detection device which can be arranged on a PCB production conveying line and used for detecting surface defects of flexible sheets such as a PP board, a copper foil board or a CCL board passing through the surface defect detection device.

Specifically, the above-mentioned surface defect detecting device has a structure shown in fig. 1, and includes a conveying device 10, a first camera 20, and a second camera 30. The conveying device 10 is used for conveying the flexible sheet described above, and the flexible sheet moves under the action of the conveying device 10 and forms a total conveying path. The first camera 20 is used for photographing and detecting defects of the upper surface of the flexible sheet, and the second camera 30 is used for photographing and detecting defects of the lower surface of the flexible sheet. Since it is necessary to detect surface defects on the upper surface and the lower surface of the flexible sheet respectively, there is a case where a part of the flexible sheet is turned up or curled at corners in a natural state. Therefore, when the conveying device 10 conveys the flexible sheet, the upper surface of the flexible sheet faces the first camera 20 when the flexible sheet reaches the shooting area of the first camera 20, and no shielding object exists between the upper surface of the flexible sheet and the first camera 20, and the flexible sheet needs to be in a flat state; when the flexible sheet reaches the shooting area of the second camera 30, the lower surface of the flexible sheet faces the second camera 30, and no shielding object exists between the lower surface of the flexible sheet and the first camera 20, and the flexible sheet needs to be in a flat state.

Specifically, the first camera 20 and the second camera 30 in the present embodiment are each fixed to the conveying apparatus 10 so that the first camera 20 and the second camera 30 can move integrally with the conveying apparatus 10. The specific working principle of the first camera 20 and the second camera 30 for photographing the surface of the flexible sheet and detecting the surface defect of the flexible sheet is conventional technical means in the art, so that the description thereof will not be repeated in this embodiment.

In the following, a detailed description of a specific embodiment of the delivery device 10 will be provided.

The embodiment of the present application provides a conveying apparatus 10, which has a structure as shown in fig. 2 to 5, and includes a frame 300, and a first conveying mechanism 100 and a second conveying mechanism 200 fixed to the frame 300. The conveyance path of the flexible sheet is conveyed by the first conveyance mechanism 100 to the second conveyance mechanism 200.

The first conveying mechanism 100 has a first conveying belt 110 and a first driving mechanism 120 that drives the first conveying belt 110 to circulate. The conveying structure of the first conveying mechanism 100 may be a belt pulley mechanism, and the first conveying belt 110 is a conveying belt in the belt pulley mechanism; the first conveying mechanism 100 may also be a chain plate mechanism, the first conveying belt 110 is a conveying chain plate in the chain plate mechanism, and the first driving mechanism 120 includes a driving motor and a speed reducer. The conveying flight and the conveying flat belt can both support the flexible sheet so that the first conveying belt 110 has a flat conveying surface.

When the first conveying mechanism 100 conveys the flexible sheet, the lower surface of the flexible sheet contacts the upper surface of the first conveying belt 110, and therefore, when the first camera 20 is disposed above the first conveying belt 110, shooting and defect recognition on the upper surface of the first conveying belt 110 can be realized. The moving path of the flexible sheet in the first conveying mechanism 100 is a first conveying path of the flexible sheet, which is a part of the total conveying path of the flexible sheet. The first conveying path in this embodiment is a straight line. In this embodiment, the flexible sheet conveyed by the conveying device 10 is one of a PP board, a copper foil board or a CCL board used for a PCB board, and the flexible sheet has a thinner thickness and a lighter weight, so that the first conveying belt 110 in the first conveying mechanism 100 is horizontally arranged, so that the surface of the first conveying belt 110 bearing the flexible sheet is also in a horizontal state, and the situation that the flexible sheet is relatively deviated from the first conveying belt 110 in the conveying process of the first conveying belt 110 is reduced. Of course, it should be noted that, in some alternative embodiments, if the flexible sheet conveyed by the conveying device 10 is heavy, the first conveying belt 110 may be disposed obliquely, and the friction between the flexible sheet and the first conveying belt 110 is used to reduce the relative offset between the flexible sheet and the first conveying belt 110 during the conveying process of the first conveying belt 110.

Further, in order to enable the flexible sheet to be in a flat state when entering the image capturing area of the first camera 20, the present embodiment provides a plurality of first air holes 111 on the first conveyor belt 110, and the first air holes 111 enable air to flow. Further, the first negative pressure body 130 is disposed below the first conveyor belt 110, and specifically, the first negative pressure body 130 is located below the first conveyor path, and the first negative pressure body 130 does not move synchronously with the first conveyor belt 110. The first negative pressure body 130 can provide negative pressure to the first air holes 111 on the first conveyor belt 110, so that the first air holes 111 subjected to the negative pressure of the first negative pressure body 130 can provide adsorption force to the upper surface of the first conveyor belt 110, and form a first negative pressure region on the upper surface of the first conveyor belt 110 as shown in fig. 7. The flexible sheet material can pass through the first negative pressure area under the conveying action of the first conveying belt 110, and the part of the flexible sheet material located in the first negative pressure area can be attached to the upper surface of the first conveying belt 110 under the negative pressure action, so that the flexible sheet material is in a flat state at least in the first area.

In the surface defect detecting device, when the upper surface of the flexible sheet needs to be detected, the first camera 20 is arranged below the first conveying belt 110, the first camera 20 faces the first negative pressure body 130, and the first camera 20 and the first negative pressure body 130 are respectively positioned at two sides of the first conveying belt 110, so that the shooting range of the first camera 20 falls into the first negative pressure area, and the upper surface of the flexible sheet in a flat state can be shot, so that the flexible sheet cannot influence the detection accuracy of the first camera 20 due to bending of the flexible sheet. Since the flexible sheet needs to be continuously conveyed, the first negative pressure body 130 is normally opened when the conveying device 10 is in an operating state, so that the first negative pressure body 130 can continuously adsorb and flatten the flexible sheet passing through the first negative pressure area.

It should be noted that, in this embodiment, the first negative pressure body 130 is connected to a negative pressure source (not shown) through a pipe, and generates a negative pressure under the action of the negative pressure source. The first negative pressure body 130 is provided with a hole, and the hole on the first negative pressure body 130 faces the first conveying belt 110 so as to act at least a part of negative pressure generated by the negative pressure source on the first air hole 111. Since the flexible sheet needs to be continuously conveyed, the first negative pressure body 130 is normally opened when the conveying device 10 is in an operating state, so that the first negative pressure body 130 can continuously adsorb and flatten the flexible sheet passing through the first negative pressure area.

The second conveying mechanism 200 has a second conveying belt 210 and a second driving mechanism 220 that drives the second conveying belt 210 to circulate, and the second conveying mechanism 200 may be one of a pulley mechanism and a link plate mechanism. In the present embodiment, the first conveying mechanism 100 and the second conveying mechanism 200 are both pulley mechanisms. A portion of the belt surface of the second conveyor belt 210 is positioned above the first conveyor belt 110 such that the second conveyor belt 210 has a projection on the first conveyor belt 110. The gap between the second conveyor belt 210 and the first conveyor belt 110 allows for the flexible sheet to enter.

In order to allow the flexible sheet to enter the gap, the flexible sheet can be conveyed by the first conveying mechanism 100 to be conveyed by the second conveying mechanism 200. Therefore, in the present embodiment, the second conveyor belt 210 is provided with a plurality of second air holes 211, and the second air holes 211 can flow air. The second negative pressure body 230 is disposed in the second conveying mechanism 200, and the second negative pressure body 230 is located above the second conveying belt 210, and the second negative pressure body 230 does not move synchronously with the second conveying belt 210. The second negative pressure body 230 can provide negative pressure to the second air holes 211 on the second conveyor belt 210, so that the second air holes 211 subjected to the negative pressure of the second negative pressure body 230 can provide adsorption force to the lower surface of the second conveyor belt 210, and form a second negative pressure region as shown in fig. 7 on the upper surface of the first conveyor belt 110. One end of the second negative pressure region is located in a gap between the first conveyor belt 110 and the second conveyor belt 210, and after the flexible sheet enters the gap under the conveyance of the first conveyor belt 110, the flexible sheet gradually enters the second negative pressure region. Thereafter, the flexible sheet is adsorbed on the lower surface of the second conveyor belt 210 by the negative pressure of the second negative pressure body 230. And the flexible sheet is conveyed in the second conveying mechanism 200 under the combined action of the second negative pressure body 230 and the second conveying belt 210. The moving path of the flexible sheet in the second conveying mechanism 200 is a second conveying path of the flexible sheet, which is a part of the total conveying path of the flexible sheet. The two conveying paths in the present embodiment are straight lines, and the first conveying belt 110 is parallel to the second conveying belt 210. The above-mentioned second negative pressure body 230 being located above the second conveyor belt 210 means that the second negative pressure body 230 is located above the second conveying path.

In the surface defect detecting device, when the lower surface of the flexible sheet needs to be detected, the second camera 30 is disposed below the second conveyor belt 210, the second camera 30 faces the second negative pressure body 230, and the second camera 30 and the second negative pressure body 230 are located on both sides of the second conveyor belt 210, so that the photographing range of the second camera 30 falls within the first negative pressure region, and the lower surface of the flexible sheet in a flat state can be photographed. Therefore, the second negative pressure body 230 can not only cooperate with the second conveyor belt 210 to complete the conveyance of the flexible sheet, but also cooperate with the second camera 30 to complete the detection of the small surface defect of the flexible sheet.

It should be noted that, in this embodiment, the second negative pressure body 230 is connected to a negative pressure source (not shown) through a pipe, and generates a negative pressure under the action of the negative pressure source. The second negative pressure body 230 is provided with a hole or a notch, and the hole or the notch on the second negative pressure body 230 faces the second conveying belt 210 so as to act at least a part of negative pressure generated by the negative pressure source on the second air hole 211. Because the flexible sheet needs to be continuously conveyed, when the conveying device 10 is in an operating state, the first negative pressure body 130 is usually in a normally open state, so that the second negative pressure body 230 can continuously adsorb and level the flexible sheet passing through the second negative pressure area, and meanwhile, the flexible sheet is prevented from falling off the second conveying belt 210.

The flexible sheet is conveyed in the first conveying mechanism 100 by the first conveying belt 110, and is conveyed in the second conveying mechanism 200 by the second conveying belt 210 and the second negative pressure body 230, so that the flexible sheet is not turned over in the whole conveying process of the flexible sheet, and the technical problem that the flexible sheet is folded or broken and damaged due to deformation in the turning process is avoided. Meanwhile, during the transportation process. In the first conveying mechanism 100, the surface defect detection of the upper surface of the flexible sheet is realized through the cooperation of the first negative pressure body 130 and the first camera 20, and in the second conveying mechanism 200, the surface defect detection of the lower surface of the flexible sheet is realized through the cooperation of the second negative pressure body 230 and the second camera 30, so that the continuous conveying of the flexible sheet is realized, and the detection of the upper surface and the lower surface of the flexible sheet is also completed. The conveying device 10 can complete defect identification on the upper surface and the lower surface of the flexible sheet by matching with the first camera 20 and the second camera 30 without turning over the flexible sheet in the process of conveying the flexible sheet. Moreover, since the turning action and the turning mechanism are eliminated, the structural complexity of the conveying device 10 is reduced on one hand, the space occupied by the whole conveying in the height direction is reduced on the other hand, and the occurrence of slipping or loss of the flexible sheet in the turning process can be avoided.

On the basis of this, the inventor has further studied and found that, on the one hand, when the above-mentioned conveying apparatus 10 is adopted, since the second negative pressure body 230 has a certain distance from the flexible sheet to the second conveying belt 210 in the process of adsorbing the flexible sheet to the second conveying belt 210 from the first conveying belt 110, the adsorption force provided by the second negative pressure body 230 cannot be fully applied to the flexible sheet, so that the second negative pressure body 230 needs to provide a larger negative pressure adsorption force to adsorb the flexible sheet to the second conveying belt 210, and the second negative pressure body 230 needs a larger power. The larger the distance between the flexible sheet and the second conveyor belt 210, the larger the required suction force of the second negative pressure body 230. Further, since the second negative pressure body 230 needs to be started for a long time, the cost required for continuous operation of the second negative pressure body 230 is high. On the other hand, with the above-mentioned conveying device 10, when flexible sheets such as copper foil or prepreg, which are very thin and liable to be curled, are conveyed, if the interval between the first negative pressure body 130 and the second negative pressure body 230 is far, the sheets 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, so that the flexible sheets may recover to curling after leaving the first negative pressure area, and the shape edges of the flexible sheets are changed due to curling, and the curling degree of each flexible sheet is not the same, so that the flexible sheets may not pass through the gap between the first conveying belt 110 and the second conveying belt 210, and thus may not be transferred from the first conveying belt 110 to the second conveying belt 210, thereby affecting the normal operation of the whole conveying device 10. Meanwhile, after the curled flexible sheet is absorbed on the second conveyor belt 210 by the second negative pressure body 230, the flexible sheet cannot be laid on the second conveyor belt 210 due to the curled portion, thereby resulting in 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 to be relatively close, the flexible sheet can immediately enter the second negative pressure area after leaving the first negative pressure area, so that the above problem caused by curling of the flexible sheet can be avoided, but the flexible sheet is suddenly deformed during the transition from the first conveyor belt 110 to the second conveyor belt 210, so that the flexible sheet is in the state shown in fig. 6, thereby causing stress concentration of the flexible sheet, causing the surface of the flexible sheet to have irremovable folds, and more serious, causing the flexible sheet to break, so that the flexible sheet becomes defective due to the folds or breaks.

In addition, since the first negative pressure body 130 needs to planarize the flexible sheet for the camera to photograph the upper surface of the flexible sheet, and the second negative pressure body 230 needs to planarize the flexible sheet for the camera to photograph the lower surface of the flexible sheet, the first negative pressure body 130 and the second negative pressure body 230 cannot be closed at will during the use of the conveying device 10.

In view of this, the present embodiment is further optimized based on the structure of the conveying apparatus 10 described above. Specifically, as shown in fig. 4 and 5, the conveying apparatus 10 further includes a third negative pressure body 140 and a positive pressure body 150, and the first negative pressure body 130, the third negative pressure body 140, the positive pressure body 150, and the second negative pressure body 230 are disposed in this order along the conveying path and the conveying direction of the flexible sheet formed by the first conveying belt 110 and the second conveying belt 210. Wherein, the third negative pressure body 140 and the positive pressure body 150 are both fixed below the first conveyor belt 110, wherein, the lower side of the first conveyor belt 110 refers to the lower side of the conveying path of the first conveyor belt 110 for conveying the flexible sheet, and neither the third negative pressure body 140 nor the positive pressure body 150 moves synchronously with the second conveyor belt 210. The third negative pressure body 140 can suck air outwards to generate negative pressure suction, and the negative pressure suction generated by the third negative pressure body 140 acts on part of the first air holes 111 on the first conveying belt 110, so that the first air holes 111 can generate negative pressure suction to the upper surface of the first conveying belt 110, a third negative pressure area shown in fig. 7 is formed on the upper surface of the first conveying belt 110, and the flexible sheet on the first conveying belt 110 is adsorbed on the upper surface of the first conveying belt 110 after entering the third negative pressure area. The positive pressure body 150 is capable of blowing air outward to generate positive pressure blowing force, and the positive pressure blowing force acts in the first air hole 111, so that the first air hole 111 can generate positive pressure blowing force to the upper surface of the first conveyor belt 110, and a positive pressure area as shown in fig. 7 is formed on the upper surface of the first conveyor belt 110, and a portion of the flexible sheet conveyed on the first conveyor belt 110 entering the positive pressure area is blown off the upper surface of the first conveyor belt 110.

Along the conveying path of the flexible sheet in the conveying device 10, the positive pressure body 150 is located between the first negative pressure body 130 and the second negative pressure body 230, and the flexible sheet sequentially passes through the first negative pressure region corresponding to the first negative pressure body 130, the positive pressure region corresponding to the positive pressure body 150, and the negative pressure region corresponding to the second negative pressure body 230. At least a part of the third negative pressure body 140 is located directly below the second conveyor belt 210, that is, at least a part of the third negative pressure region formed by the third negative pressure body 140 is located in the gap formed by the first conveyor belt 110 and the second conveyor belt 210 that are staggered. The third negative pressure region and the first negative pressure region may partially overlap or may be spaced apart from each other. The spacing between the positive pressure body 150 and the second negative pressure body 230 is less than the length of the flexible sheet.

By the arrangement, after the flexible sheet enters the first conveying belt 110, the flexible sheet enters a first negative pressure area formed by the first negative pressure body 130 and is flatly adsorbed on the first conveying belt 110, and the surface defect detection of the upper surface of the flexible sheet is realized by matching with the first camera 20. After that, the flexible sheet enters a third negative pressure area formed by the third negative pressure body 140 and is flatly adsorbed on the first conveying belt 110 again, so that the phenomenon that the edge of the flexible sheet is curled and tilted is eliminated, the flexible sheet can smoothly enter a gap formed by the first conveying belt 110 and the second conveying belt 210 in a staggered manner, and the phenomenon that the flexible sheet cannot enter the gap is avoided. Then, the flexible sheet enters the positive pressure region formed by the positive pressure body 150 again, the front end of the flexible sheet is lifted by the positive pressure body 150 to leave the first conveyor belt 110, and then the front end of the flexible sheet enters the third negative pressure region formed by the third negative pressure body 140 in a suspended state. The front end of the flexible sheet is flatly absorbed onto the second conveyer belt 210 by the third negative pressure body 140, and the surface defect detection of the lower surface of the flexible sheet is completed by matching with the second camera 30, and then the flexible sheet moves under the conveying action of the second conveyer belt 210, so that the function of transition of the flexible sheet from the first conveyer belt 110 to the second conveyer belt 210 is realized. When the flexible sheet is on the first conveying belt 110, the positive pressure body 150 can blow the flexible sheet off the first conveying belt 110 with a small blowing force, so that the flexible sheet is pre-lifted. Meanwhile, since at least a portion of the positive pressure body 150 is located directly below the second conveyor belt 210, the height of the flexible sheet that is pre-lifted by the positive pressure body 150 may be limited by the second conveyor belt 210, so that the flexible sheet can eventually move along the second conveyor belt 210.

After the flexible sheet is blown off the first conveyor belt 110, the distance between the flexible sheet and the second conveyor belt 210 is reduced, so that the second negative pressure body 230 can absorb the portion of the flexible sheet that is pre-lifted onto the second conveyor belt 210 with a smaller absorption force, the suction force required by the second negative pressure body 230 is reduced, and the problem that after the type and thickness of the flexible sheet are changed, part of the flexible sheet cannot be absorbed onto the second conveyor belt 210 is avoided.

In addition, because the flexible sheet is pre-lifted under the action of the positive pressure body 150, the state that the flexible sheet is transited from the first conveying belt 110 to the second conveying belt 210 is shown in fig. 8, at this time, the lifting curve of the flexible sheet is relatively gentle, and the bending angle of the flexible sheet is smaller than that of the flexible sheet when the positive pressure body 150 is not arranged in fig. X, so that the problem that the flexible sheet is creased due to overlarge bending angle of the flexible sheet can be avoided.

In order to further reduce the magnitude of the negative pressure suction force required to be provided by the second negative pressure body 230, in this embodiment, it is preferable that at least a portion of the positive pressure body 150 is located directly below the second negative pressure body 230, so that the positive pressure region of the positive pressure body 150 and at least a portion of the negative pressure region of the second negative pressure body 230 intersect. After the portion of the flexible sheet that is pre-lifted by the positive pressure body 150 enters the position where the positive pressure area and the second negative pressure area intersect, the portion of the flexible sheet that is pre-lifted can continue to lift upwards under the action of the second negative pressure body 230 until the portion of the flexible sheet is attached to the first conveyor belt 110. The arrangement is such that at the intersecting location, the blowing force of the positive pressure body 150 and the suction force of the negative pressure body can act simultaneously on the same location as the flexible sheet, further reducing the power of the second negative pressure body 230. Meanwhile, since the positive pressure body 150 is spaced between the second negative pressure body 230 and the third negative pressure body 140, the flexible sheet material will not be immediately subjected to the adsorption force of the second negative pressure body 230 after being subjected to the adsorption force of the third negative pressure body 140, so that the flexible sheet material can be prevented from being bent greatly, and the phenomenon of folding and even breaking of the flexible sheet material program can be effectively avoided.

Preferably, the positive pressure body 150 is located entirely under the second negative pressure body 230, and the positive pressure body 150 is located at the front end of the second negative pressure body 230. Note that, the front end of the second negative pressure body 230 refers to an end of the second negative pressure body 230 near the first negative pressure body 130, so that the flexible sheet is not subjected to the negative pressure suction force of the second negative pressure body 230 before entering the positive pressure body 150. When the flexible sheet material enters the positive pressure body 150, the same position of the flexible sheet material can pass through the positive pressure blowing force of the positive pressure body 150 and the negative pressure suction force of the second negative pressure body 230, and the blowing force of the positive pressure body 150 on the flexible sheet material is overlapped with the suction force of the second negative pressure body 230 on the flexible sheet material, so that the flexible sheet material is more easily adsorbed on the second conveying belt 210.

The positive pressure generated by the positive pressure body 150 is adjustable, and the negative pressure generated by the third negative pressure body 140 is adjustable. The minimum adjustable to zero turns off the positive pressure body 150 and/or the third negative pressure body 140. The magnitude of the positive pressure blowing force of the positive pressure body 150 or the magnitude of the negative pressure suction force of the third negative pressure body 140 may be controlled by a valve.

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, and 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 third negative pressure body 140 may be manually controlled to be opened or closed, or may be set in accordance with the conveyance timing of the flexible sheet. In this embodiment, the third negative pressure body 140 is closed when a flexible sheet enters under the second conveyor belt 210, and 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, so that the third negative pressure body 140 can be opened to allow the next flexible sheet to enter the third negative pressure area. To satisfy this opening and closing condition, it is necessary to make the distance between adjacent two flexible sheets on the first conveyor belt 110 larger than the length of the third negative pressure body 140 in the flexible sheet conveying direction, and on the other hand, it is necessary to make the distance between adjacent two flexible sheets on the first conveyor belt 110 larger than the coverage length of the third negative pressure region along the conveying method. By selectively opening or closing the third negative pressure body 140, the third negative pressure body 140 can be opened when the flexible sheet is required to enter the gap between the first conveyor belt 110 and the second conveyor belt 210, so that the flexible sheet does not fail to enter the gap. In addition, when the flexible sheet needs to be pre-lifted, the third negative pressure body 140 can be closed, so that the flexible sheet is not subjected to the negative pressure suction force of the third negative pressure body 140, and the rising curve of the flexible sheet in the process of transition from the first conveying belt 110 to the second conveying belt 210 is more gentle.

By adjusting the positive pressure blowing force of the positive pressure body 150, the height of the flexible sheet that is pre-lifted can be changed correspondingly, the greater the positive pressure, the higher the flexible sheet that is pre-lifted, and when the flexible sheet is closer to the second conveyor belt 210, the second negative pressure body 230 will be easier to adsorb the flexible sheet on the second conveyor belt 210, but the smaller the force of the positive pressure blowing force of the positive pressure body 150 on the flexible sheet will be. Therefore, the positive pressure body 150 can be adjusted to an appropriate positive pressure blowing force by adjusting the positive pressure blowing force of the positive pressure body 150.

In order to better control the start-stop time of the third negative pressure body 140, the conveying device 10 provided in this embodiment further includes a recognition device 141, where the recognition device 141 is electrically connected to the third negative pressure body 140, and specifically, the recognition device 141 is electrically connected to an electromagnetic valve that controls the magnitude of the negative pressure suction force of the third negative pressure body 140. When the recognition device 141 recognizes that the end portion of the flexible sheet enters between the third negative pressure body 140 and the positive pressure body 150, the third negative pressure body 140 is closed. Since at least a portion of the third negative pressure body 140 is located directly below the second complaint belt, when the end of the flexible sheet enters between the third negative pressure body 140 and the positive pressure body 150, it means that the leading end of the flexible sheet has entered the gap between the first conveyor belt 110 and the second conveyor belt 210, and therefore closing the third negative pressure body 140 at this time does not cause a problem that the flexible sheet cannot enter the gap.

In some alternatives, the identification device 141 may be electrically connected to the positive pressure body 150 while controlling the start/stop timing of the third negative pressure body 140, and the identification device 141 may be electrically connected to a solenoid valve that controls the magnitude of the positive pressure blowing force of the positive pressure body 150. When the recognition device 141 recognizes that the end portion of the flexible sheet enters between the third negative pressure body 140 and the positive pressure body 150, the positive pressure body 150 is turned on. In this way, it is possible to reduce the energy consumption of the positive pressure source that supplies positive pressure to the positive pressure body 150 on the basis of ensuring that the positive pressure body 150 can act on each flexible sheet.

As for the mounting position of the identification device 141, in the present embodiment, the identification device 141 is provided between the third negative pressure body 140 and the positive pressure body 150 in the conveying direction of the flexible sheet. This arrangement makes it possible to bring the mounting position of the identification device 141 close to the position where the flexible sheet needs to reach, thereby improving the identification accuracy of the identification device 141, and on the other hand, since at least a part of the third negative pressure body 140 is located directly under the second conveyor belt 210 and at least a part of the positive pressure body 150 is located directly under the second negative pressure body 230, the identification device 141 is necessarily located under the second conveyor belt 210. The second conveyor belt 210 and the first conveyor belt 110 can also play a certain role in protecting the identification device 141, and reduce the erroneous judgment of the identification device 141 caused by other foreign matters reaching the identification range of the identification device 141.

The identification device 141 in this embodiment is a photosensor and a controller. The photoelectric sensor is connected with the controller, and the controller is connected with the electromagnetic valve. The identification device 141 constructed using a photosensor and a controller can be applied because the flexible sheet in the PCB is light in weight. Of course, the identification device 141 may be a combination of a piezoelectric sensor and a controller, or a combination of an ultrasonic sensor and a controller.

Further, as shown in fig. X and X, the second conveying mechanism 200 is further provided with a guide 240, and the guide 240 has a guide surface that is located above the first conveying belt 110 and faces the first conveying belt 110. The positions of the front end and the rear end of the guide surface are set along the conveying direction of the flexible sheet, and 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 butted with the second conveying belt 210 or the tail end of the guide surface is set below the second conveying belt 210. The gap between the guide surface and the first conveyor belt 110 is for the flexible sheet to enter. After the guide 240 is provided, the flexible sheet can quickly enter the gap between the guide surface and the first conveyor belt 110 after receiving the suction force of the third negative pressure body 140, so that the flexible sheet can smoothly transition into the gap between the first conveyor belt 110 and the second conveyor belt 210, and the flexible sheet is prevented from entering after the edge of the third negative pressure body 140.

After the guide 240 is disposed, the third negative pressure body 140 may be disposed at a position between the first negative pressure body 130 and the third negative pressure body 140. If the guide 240 is not provided, the third negative pressure body 140 is provided so that at least a portion of the third negative pressure body 140 is located directly below the second conveyor belt 210, that is, at least a portion of the third adsorption 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.

Specifically, the surface of the guide member 240 includes a first guide surface 241 and a second guide surface 242, the first guide surface 241 and the second guide surface 242 are smooth planes, and the rear end of the first guide surface 241 is connected with the front end of the second guide surface 242 through an arc transition, so as to avoid increasing the curling angle of the flexible sheet 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.

Further, the distance between the guide 240 and the first conveyor belt 110 is adjustable, and flexible sheets with different thicknesses can be accommodated by adjusting the position of the guide 240. In the present embodiment, the guide 240 and the second conveying mechanism 200 achieve the height adjustment of the guide 240 by the cooperation of the waist-shaped groove and the bolt.

Further, the distance 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 be passed 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 adsorb the flexible sheet upward, the second negative pressure body 230 can also have a sufficient adsorption force to the flexible sheet by adjusting the distance between the first conveyor belt 110 and the second conveyor belt 210.

Further, in the present embodiment, the first conveying mechanism 100 and the second conveying mechanism 200 in the conveying device 10 are both fixed to the frame 300. The first conveying mechanism 100 includes a first bracket 160, and the first conveyor belt 110 and the first driving mechanism on the first conveying mechanism 100 are both fixed to the first bracket 160. The second conveying mechanism 200 includes a second bracket 250, and the second conveyor belt 210 and the second driving mechanism 220 are fixed on the second bracket 250. In this embodiment, the distance between the first conveyor belt 110 and the second conveyor belt 210 is adjusted by adjusting the relative position of the second conveyor belt 210 and the frame 300 in the second bracket 250. In some alternative embodiments, the adjustment of the spacing of the first conveyor belt 110 and the second conveyor belt 210 may also be accomplished by adjusting the relative positions of the first bracket 160 and the second bracket 250.

In the present embodiment, the first negative pressure body 130 and the third negative pressure body 140 are both fixed on the first bracket 160, and the second negative pressure body 230 is fixed on the second bracket 250.

In addition, in the present embodiment, the distance between the third negative pressure body 140 and the first conveying belt 110 is adjustable. By adjusting the gap between the third negative pressure body 140 and the first conveying belt 110, the effect of adjusting the amount of the suction force of the third negative pressure body 140 to the flexible sheet on the first conveying belt 110 can be achieved, when the distance between the third negative pressure body 140 and the first conveying belt 110 increases, the suction force of the third negative pressure body 140 to the flexible sheet entering the third negative pressure region decreases, and when the distance between the third negative pressure body 140 and the first conveying belt 110 decreases, the suction force of the third negative pressure body 140 to the flexible sheet entering the third negative pressure region increases.

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 attached to the lower surface of the first conveyor belt 110. On the one hand, the loss of the adsorption force after the third negative pressure body 140 is started can be reduced, the adsorption effect on the flexible sheet is improved, and on the other hand, the third negative pressure body 140 can also play a role in supporting the first conveying belt 110, and the swing amplitude of the third conveying belt after loosening is reduced.

The spacing between the positive pressure body 150 and the first conveyor belt 110 is also adjustable. By adjusting the distance between the positive pressure body 150 and the first conveyor belt 110, the positive pressure of the positive pressure body 150 can be adjusted without changing the output air flow of the positive pressure body 150, and the height at which the flexible sheet is blown up can be adjusted to a certain extent. When the positive pressure body 150 is attached to the first conveyor belt 110, the air flows generated by the positive pressure body 150 are all discharged from the first air holes 111 on the first conveyor belt 110, and the blowing force of the positive pressure body 150 on the flexible sheet is maximum; when the interval between the positive pressure body 150 and the first conveyor belt 110 is gradually increased, only a part of the air flow generated by the positive pressure body 150 is discharged from the first air holes 111 on the first conveyor belt 110, and the blowing force of the positive pressure body 150 on the flexible sheet is gradually reduced.

It should be noted that, in the present embodiment, the adjustment of the distance between the positive pressure body 150 and the first conveying belt 110 is achieved by adjusting the position of the positive pressure body 150, specifically, the adjustment of the height of the positive pressure body 150 is achieved between the positive pressure body 150 and the frame 300 through the matched waist-shaped grooves and bolts, so as to achieve the adjustment of the distance between the positive pressure body 150 and the first conveying belt 110. Of course, in some alternative embodiments, the distance between the positive pressure body 150 and the first conveyor belt 110 may be adjusted by lifting a screw, or the distance between the positive pressure body 150 and the first conveyor belt 110 may be adjusted by electric driving.

Preferably, the upper surface of the positive pressure body 150 is attached to the first conveyor belt 110, so that the positive pressure body 150 is supported by the first conveyor belt 110. The pore canal on the positive pressure body 150 is arranged on the upper surface of the positive pressure body 150, after the positive pressure body 150 is attached to the first conveying belt 110, the air blown out by the positive pressure body 150 can be discharged from the first air hole 111 to the maximum extent, and meanwhile, after the positive pressure body 150 supports the first conveying belt 110, the first conveying belt 110 can be prevented from swinging downwards, so that the swinging amplitude of the first conveying belt 110 after loosening is reduced.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

Claims (10)

1. A conveying apparatus for conveying a flexible sheet, comprising:

a first conveying mechanism (100), wherein the first conveying mechanism (100) is provided with a first conveying belt (110), and a first negative pressure body (130) is fixed below the first conveying belt (110);

a second conveying mechanism (200), wherein the second conveying mechanism (200) is provided with a second conveying belt (210), a part of the second conveying belt (210) is positioned above the first conveying belt (110), and a second negative pressure body (230) is fixed above the second conveying belt (210); wherein,,

positive pressure body (150) and third negative pressure body (140) are fixed with below first conveyer belt (110), along the direction of delivery of flexible sheet, first negative pressure body (130), third negative pressure body (140), positive pressure body (150), second negative pressure body (230) set gradually, at least a portion of third negative pressure body (140) are located under second conveyer belt (210).

2. A delivery device according to claim 1, wherein at least a portion of the positive pressure body (150) is located directly below the second negative pressure body (230).

3. A delivery device according to claim 1, further comprising identification means (141), said identification means (141) being electrically connected to a third negative pressure body (140), said third negative pressure body (140) being closed when said identification means (141) identifies that an end of the flexible sheet material enters between the third negative pressure body (140) and the positive pressure body (150).

4. A conveying device according to claim 3, characterized in that the identification means (141) are arranged between the third negative pressure body (140) and the positive pressure body (150) in the conveying direction of the flexible sheet.

5. A conveyor 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.

6. A conveyor according to claim 1, characterized in that the distance between the positive pressure body (150) and the first conveyor belt (110) is adjustable.

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

8. A conveying device according to claim 1, characterized in that the second conveying mechanism (200) is provided with a guide (240), the guide (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 in abutment with the second conveying belt (210) or the tail end of the guide surface is located below the second conveying belt (210).

9. A conveyor device according to claim 8, 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) being in contact with the front end of the second guide surface (242), the front end of the first guide surface (241) being higher than the rear end of the first guide surface (241), the second guide surface (242) being parallel to the first conveyor belt (110).

10. A surface defect detecting device, characterized by comprising a conveying device according to any one of claims 1-9, and a first camera and a second camera, wherein the first camera is arranged above the first conveying surface and faces the first negative pressure body (130), and the second camera is arranged below the second conveying surface and faces the second negative pressure body (230).