Locating mechanism for AOI (automatic optical inspection) of LCM (liquid crystal module) picture

Abstract

The utility model discloses a positioning mechanism for LCM picture AOI detection, and belongs to the technical field of positioning mechanisms. The device mainly comprises a base, a pair of main body conveying belts and a transfer conveying belt are installed at the upper end of the base, the upper surfaces of the main body conveying belts and the transfer conveying belt are located at the same horizontal position, the transfer conveying belt is located between the main body conveying belts, and an ejection assembly is arranged on the upper side of the transfer conveying belt; according to the positioning mechanism for LCM picture AO I detection, through the arrangement of the ejection assembly, large-batch screens can be continuously detected under the condition that the main body conveying belt and the transfer conveying belt do not stop running, the detection speed is increased, energy consumption is reduced, the service life of the main body conveying belt and the transfer conveying belt is prolonged, and meanwhile, the production efficiency is improved. Through cooperative use of the ejection assembly and the electric push rod, the screen can be quickly positioned in the longitudinal and transverse directions, the positioning speed and accuracy are improved, and therefore the detection efficiency and the detection precision are improved.

Description

Technical Field

[0001] The present application relates to the technical field of positioning mechanisms, and specifically to a positioning mechanism for AOI detection of LCM screens. Background Art

[0002] LCM (Liquid Crystal Module) is an abbreviation for a liquid crystal module, referring to the components of a liquid crystal display screen. AOI (Automated Optical Inspection) is an abbreviation for automated optical inspection, which is a method of using optical equipment and computer vision technology to detect and judge defects and errors in the manufacturing process. LCM screen AOI detection refers to using automated optical inspection technology to detect the display screen of a liquid crystal module (or liquid crystal display). Through optical equipment and computer vision technology, defects, errors or abnormalities on the screen, such as dead pixels, bright spots, and missing lines, can be automatically detected and identified. This detection method can improve production efficiency, reduce defects in the manufacturing process, and ensure that the quality of the liquid crystal module meets the standard requirements.

[0003] In existing AOI inspection machines, the LCM screen is mostly conveyed under the camera by a conveyor belt, and the position of the screen is corrected by a positioning mechanism. Then, the screen is automatically scanned by the camera to collect images. The tested solder joints are compared with the qualified parameters in the database. After image processing, defects on the screen are detected and displayed through a monitor or an automatic marker for maintenance personnel to repair. However, in actual use, whenever an LCM screen moves under the camera, the conveyor belt must stop in order to position and stably photograph the screen. The repeated start and stop of the conveyor belt will increase energy consumption and reduce the service life of the conveyor belt. Moreover, in order to prevent the screen from having a large displacement due to inertia when the conveyor belt stops, the speed of the conveyor belt must be relatively slow, which also leads to a reduction in production efficiency.

[0004] Therefore, it is necessary to provide a positioning mechanism for AOI detection of LCM screens to solve the above problems.

[0005] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of the present application, and therefore, it may include information that does not constitute the prior art. Summary of the Utility Model

[0006] Based on the above problems existing in the prior art, the problem to be solved by this application is to provide a positioning mechanism for LCM screen AOI detection. Through the setting of the ejection component, it is possible to continuously detect a large number of screens without stopping the operation of the main conveyor belt and the transfer conveyor belt, improving the detection speed, reducing energy consumption, and extending the service life of the main conveyor belt and the transfer conveyor belt. At the same time, by using the ejection component and the electric push rod in cooperation, it is possible to quickly position the screen in the vertical and horizontal directions, improving the positioning speed and accuracy, thereby improving the detection efficiency and detection accuracy.

[0007] The technical solution adopted by this application to solve its technical problems is: a positioning mechanism for LCM screen AOI detection, including a base. A pair of main conveyor belts and a transfer conveyor belt are respectively installed at the upper end of the base. The upper surfaces of the pair of main conveyor belts and the transfer conveyor belt are at the same horizontal position. The transfer conveyor belt is located between the pair of main conveyor belts, and an ejection component is arranged above the transfer conveyor belt. A pair of symmetrically arranged electric push rods are installed at the top of the base. A positioning component is arranged above the ejection component. The positioning component includes a pair of symmetrically arranged movable blocks and a pair of symmetrically arranged positioning plates. A pair of slide rods are fixedly connected to the ends of the pair of positioning plates away from each other. The slide rods penetrate through the movable blocks.

[0008] Further, the ejection component includes a pair of symmetrically arranged support plates and a pair of symmetrically arranged limiting plates. The output ends of the pair of electric push rods are respectively fixedly connected to the pair of support plates. The two ends of the limiting plate are respectively fixedly connected to the pair of support plates.

[0009] Further, the distance between the pair of support plates is greater than the width of the transfer conveyor belt. The limiting plate matches the gap between the main conveyor belt and the transfer conveyor belt. A baffle is fixedly connected to the top end of one of the limiting plates.

[0010] Further, rubber pads are installed at the ends of the pair of positioning plates close to each other. The pair of movable blocks are respectively slidably connected to the top ends of the pair of support plates. Transverse racks are fixedly connected to the ends of the pair of movable blocks away from each other. Springs are sleeved on the outer ends of the slide rods.

[0011] Further, the positioning component further includes a pair of symmetrically arranged mounting blocks. The pair of mounting blocks are respectively fixedly connected to the top ends of the pair of support plates. Gears are rotatably connected to the inner ends of the pair of mounting blocks.

[0012] Further, a pair of symmetrically arranged vertical racks are fixedly connected to the top of the base. The pair of vertical racks are respectively located on both sides of the ejection component. Both the vertical rack and the transverse rack are meshed with the gear.

[0013] The beneficial effects of the present application are as follows: A positioning mechanism for LCM screen AOI detection provided by the present application, through the setting of the ejection assembly, can continuously detect a large number of screens without stopping the operation of the main conveyor belt and the transfer conveyor belt, improving the detection speed, reducing energy consumption, and extending the service life of the main conveyor belt and the transfer conveyor belt. At the same time, by using the ejection assembly and the electric push rod in cooperation, the screen can be quickly positioned in the vertical and horizontal directions, improving the positioning speed and accuracy, thereby improving the detection efficiency and detection accuracy.

[0014] In addition to the purposes, features, and advantages described above, the present application has other purposes, features, and advantages. The following will refer to the drawings for a further detailed description of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings forming a part of this application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application.

[0016] In the drawings:

[0017] Figure 1 is a schematic diagram of the overall structure;

[0018] Figure 2 is an exploded structure diagram;

[0019] Figure 3 is a schematic diagram of the ejection assembly and the positioning assembly structure;

[0020] Figure 4 is a partial structure diagram of the positioning assembly;

[0021] Figure 5 is a schematic diagram of the first state of the ejection assembly;

[0022] Figure 6 is a schematic diagram of the second state of the ejection assembly.

[0023] Among them, the reference numerals in the drawings are as follows:

[0024] 1, base;

[0025] 2, main conveyor belt;

[0026] 3, transfer conveyor belt;

[0027] 4, ejection assembly; 401, support plate; 402, limiting plate; 403, baffle;

[0028] 5, electric push rod;

[0029] 6, vertical rack;

[0030] 7. Positioning component; 701. Mounting block; 702. Gear; 703. Movable block; 704. Horizontal rack; 705. Positioning plate; 706. Slide bar; 707. Spring. Detailed implementation manners

[0031] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] In order to enable those skilled in the art of this technology to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0033] As Figures 1 - 3 shown in FIGS. 5 and 6, the present application provides a positioning mechanism for LCM screen AOI detection, including a base 1. A pair of main conveyors 2 and a transfer conveyor 3 are respectively installed at the upper end of the base 1. The upper surfaces of the pair of main conveyors 2 and the transfer conveyor 3 are at the same horizontal position. The transfer conveyor 3 is located between the pair of main conveyors 2, and an ejection assembly 4 is arranged above the transfer conveyor 3. A pair of symmetrically arranged electric push rods 5 are installed at the top end of the base 1. A positioning component 7 is arranged above the ejection assembly 4. The positioning component 7 includes a pair of symmetrically arranged movable blocks 703 and a pair of symmetrically arranged positioning plates 705. A pair of slide bars 706 are fixedly connected to the mutually remote ends of the pair of positioning plates 705. The slide bars 706 penetrate through the movable blocks 703. The ejection assembly 4 includes a pair of symmetrically arranged support plates 401 and a pair of symmetrically arranged limiting plates 402. The output ends of the pair of electric push rods 5 are respectively fixedly connected to the pair of support plates 401. The two ends of the limiting plates 402 are respectively fixedly connected to the pair of support plates 401. The distance between the pair of support plates 401 is greater than the width of the transfer conveyor 3. The limiting plates 402 match the gaps between the main conveyor 2 and the transfer conveyor 3. A baffle 403 is fixedly connected to the top end of one of the limiting plates 402.

[0034] A pair of main conveyor belts 2 and transfer conveyor belts 3 operate at the same speed and are jointly responsible for transporting the LCM screen. The screen comes from one main conveyor belt 2 and goes to another main conveyor belt 2, with the transfer conveyor belt 3 in the middle for transfer. The AOI detection camera is set above the transfer conveyor belt 3. In this solution, the ejecting component 4 can be adjusted at three height positions. Among them, the upper surfaces of a pair of support plates 401 are located below the upper surface of the transfer conveyor belt 3, the limiting plate 402 is located in the gap between the main conveyor belt 2 and the transfer conveyor belt 3, and the upper surface of the baffle 403 is also below the upper surfaces of the main conveyor belt 2 and the transfer conveyor belt 3. This is the first height (such as Figure 5 ). At this height, the screen can move smoothly from one main conveyor belt 2 to another main conveyor belt 2 without being blocked by the ejecting component 4. When detecting, the user starts a pair of electric push rods 5 to rise, driving the ejecting component 4 to rise to the second height (such as Figure 6 ). At the second height, the baffle 403 comes above the main conveyor belt 2 and the transfer conveyor belt 3, but the heights of the support plates 401 and the limiting plate 402 still do not exceed the upper surface of the transfer conveyor belt 3. At this time, the screen will still move from one main conveyor belt 2 to the transfer conveyor belt 3, but will stop moving when touching the baffle 403. At this time, the longitudinal positioning of the screen is achieved. Then the pair of electric push rods 5 quickly lift upwards again to the third height, lifting the pair of support plates 401 above the main conveyor belt 2 and the transfer conveyor belt 3, so that the bottom end of the screen is separated from the transfer conveyor belt 3. This is to avoid the continuous friction between the bottom end of the screen and the running transfer conveyor belt 3, playing a protective role for the screen. During the process of the ejecting component 4 rising again, the positioning component 7 will perform horizontal positioning on the screen, thereby realizing the correction of the screen position. Then the camera can take pictures of the screen. After taking the pictures, the electric push rod 5 drives the ejecting component 4 to move down to the first height, making the baffle 403 return to the lower side of the upper surfaces of the main conveyor belt 2 and the transfer conveyor belt 3. When the screen touches the transfer conveyor belt 3, it will continue to move to another main conveyor belt 2. And when the screen is transported away, the electric push rod 5 controls the ejecting component 4 to come to the second height again to stop the next screen. Such a setting can continuously detect a large number of screens without stopping the main conveyor belt 2 and the transfer conveyor belt 3, and quickly perform longitudinal and horizontal positioning on the screen through the cooperation of the ejecting component 4 and the electric push rod 5.

[0035] Such as Figures 3 - 4As shown, rubber pads are installed at one end of a pair of positioning plates 705 close to each other. A pair of movable blocks 703 are respectively slidably connected to the tops of a pair of support plates 401, and a transverse rack 704 is fixedly connected to one end of each of the pair of movable blocks 703 away from each other. A spring 707 is sleeved on the outer end of a slide bar 706. The positioning assembly 7 further includes a pair of symmetrically arranged mounting blocks 701. The pair of mounting blocks 701 are respectively fixedly connected to the tops of the pair of support plates 401, and a gear 702 is rotatably connected to the inner end of each of the pair of mounting blocks 701. A pair of symmetrically arranged vertical racks 6 are fixedly connected to the top of the base 1. The pair of vertical racks 6 are respectively located on both sides of the ejecting assembly 4. The vertical rack 6 and the transverse rack 704 are both meshed with the gear 702.

[0036] When the ejecting assembly 4 moves up from the second height to the third height, the gear 702 will rotate under the action of the vertical rack 6. The gear 702 can push the transverse rack 704 to move, so that the transverse rack 704 drives the movable block 703 to slide on the support plate 401, and then pushes a pair of positioning plates 705 to move synchronously in the direction of approaching each other, and clamps the screen, thereby realizing the horizontal positioning of the screen. For screens of different widths, after a pair of positioning plates 705 abut against the screen, they can drive the slide bar 706 to slide on the movable block 703 and compress the spring 707, so as to adapt to screens of different widths. The rubber pads provided on the positioning plates 705 can play a role in protecting the edge of the screen and prevent the clamping of the positioning plates 705 from wearing the screen.

[0037] Working principle:

[0038] During use, a pair of main conveyor belts 2 and a transfer conveyor belt 3 operate at the same speed. The screen comes from one main conveyor belt 2 and goes to another main conveyor belt 2, with the transfer conveyor belt 3 in the middle for transfer. The upper surfaces of a pair of support plates 401 are located below the upper surface of the transfer conveyor belt 3. The limit plate 402 is located in the gap between the main conveyor belt 2 and the transfer conveyor belt 3. The upper surface of the baffle plate 403 is also below the upper surfaces of the main conveyor belt 2 and the transfer conveyor belt 3. At this time, the movement of the screen will not be blocked by the ejecting assembly 4. When detecting, the user starts a pair of electric push rods 5 to rise, driving the ejecting assembly 4 to rise, so that the baffle plate 403 comes to the upper side of the main conveyor belt 2 and the transfer conveyor belt 3. However, the heights of the support plates 401 and the limit plate 402 still do not exceed the upper surface of the transfer conveyor belt 3. At this time, the screen will still move from one main conveyor belt 2 to the transfer conveyor belt 3, but will stop moving when touching the baffle plate 403. At this time, the longitudinal positioning of the screen is realized. Then, the pair of electric push rods 5 quickly lift upward again, so that the pair of support plates 401 rise above the main conveyor belt 2 and the transfer conveyor belt 3, so that the bottom end of the screen is separated from the transfer conveyor belt 3. During the process of the ejecting assembly 4 rising again, the gear 702 will rotate under the action of the vertical rack 6. Through the gear 702, the horizontal rack 704 can be pushed to move, so that the horizontal rack 704 drives the movable block 703 to slide on the support plate 401, and then pushes a pair of positioning plates 705 to move synchronously in the direction of approaching each other, and clamps the screen, thereby realizing the horizontal positioning of the screen. For screens of different widths, after the pair of positioning plates 705 abut against the screen, they can drive the slide rod 706 to slide on the movable block 703 and squeeze the spring 707, so as to adapt to screens of different widths. Then, the camera on the upper side of the transfer conveyor belt 3 takes pictures of the screen for detection. After the picture taking is completed, the electric push rod 5 drives the ejecting assembly 4 to move downward, so that the baffle plate 403 returns to the lower side of the upper surfaces of the main conveyor belt 2 and the transfer conveyor belt 3. When the screen touches the transfer conveyor belt 3, it will continue to move to another main conveyor belt 2. When the screen is transported away, the electric push rod 5 controls the ejecting assembly 4 to rise again, so that the baffle plate 403 rises to stop the next screen. With such a setting, it is possible to continuously detect a large number of screens without stopping the operation of the main conveyor belt 2 and the transfer conveyor belt 3, and through the cooperation of the ejecting assembly 4 and the electric push rod 5, quickly position the screen in the vertical and horizontal directions.

[0039] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A positioning mechanism for LCM screen AOI detection, including a base (1), characterized in that: At the upper end of the base (1), a pair of main conveyer belts (2) and a transfer conveyer belt (3) are respectively installed. The upper surfaces of the pair of main conveyer belts (2) and the transfer conveyer belt (3) are at the same horizontal position. The transfer conveyer belt (3) is located between the pair of main conveyer belts (2), and an ejecting assembly (4) is arranged above the transfer conveyer belt (3). At the top end of the base (1), a pair of symmetrically arranged electric push rods (5) are installed. A positioning assembly (7) is arranged above the ejecting assembly (4). The positioning assembly (7) includes a pair of symmetrically arranged movable blocks (703) and a pair of symmetrically arranged positioning plates (705). At one end of each of the pair of positioning plates (705) away from each other, a pair of slide rods (706) are fixedly connected. The slide rods (706) penetrate through the movable blocks (703).

2. The positioning mechanism for LCM screen AOI detection according to claim 1, characterized in that: The ejecting assembly (4) includes a pair of symmetrically arranged support plates (401) and a pair of symmetrically arranged limiting plates (402). The output ends of the pair of electric push rods (5) are respectively fixedly connected to the pair of support plates (401). The two ends of the limiting plate (402) are respectively fixedly connected to the pair of support plates (401).

3. A positioning mechanism for LCM screen AOI detection according to claim 2, characterized in that: The distance between the pair of support plates (401) is greater than the width of the transfer conveyer belt (3). The limiting plate (402) matches the gap between the main conveyer belt (2) and the transfer conveyer belt (3). A baffle (403) is fixedly connected to the top end of one of the limiting plates (402).

4. A positioning mechanism for LCM screen AOI detection according to claim 1, characterized in that: Rubber pads are installed at one end of each of the pair of positioning plates (705) close to each other. The pair of movable blocks (703) are respectively slidably connected to the top ends of the pair of support plates (401). At one end of each of the pair of movable blocks (703) away from each other, a transverse rack (704) is fixedly connected. Springs (707) are sleeved on the outer ends of the slide rods (706).

5. The positioning mechanism for LCM screen AOI detection according to claim 2, characterized in that: The positioning assembly (7) further includes a pair of symmetrically arranged mounting blocks (701). The pair of mounting blocks (701) are respectively fixedly connected to the top ends of the pair of support plates (401). A gear (702) is rotatably connected to the inner end of each of the pair of mounting blocks (701).

6. The positioning mechanism for LCM screen AOI detection according to claim 5, characterized in that: A pair of symmetrically arranged vertical racks (6) are fixedly connected to the top end of the base (1). The pair of vertical racks (6) are respectively located on both sides of the ejecting assembly (4). Both the vertical rack (6) and the transverse rack (704) are meshed with the gear (702).

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