Screen printing plate detection device

Abstract

The utility model relates to the technical field of silk screen detection, in particular to a silk screen detection device. The silk screen plate detection device comprises a portal frame, a first driving mechanism, a detection camera, a light-transmitting platform, a light source, a second driving mechanism and a processing terminal, the first driving mechanism is arranged on the portal frame; the detection camera is connected with the first driving mechanism, moves along the length direction of the portal frame under the traction of the first driving mechanism, and is used for shooting a silk screen plate below the portal frame and outputting a to-be-detected image; the light-transmitting platform is used for bearing the silk screen; the light source is arranged below the light-transmitting platform; the second driving mechanism is used for driving the light-transmitting platform to move perpendicular to the length direction of the portal frame; and the processing terminal is used for outputting a detection result of the screen printing plate according to the to-be-detected image. According to the structure, the detection device is suitable for detection of screen printing plates of various specifications, and the applicability of detection of the screen printing plates of the various specifications is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of silk screen plate detection, and particularly relates to a silk screen plate detection device. BACKGROUND

[0002] In the field of semiconductors, silk screen plates are used to print conductive paste on circuit boards, and before use, it is necessary to detect whether the grid of the silk screen plate is blocked or the like, and due to the fine structure, it is difficult to accurately detect by the naked eye. At present, although there are corresponding machine vision detection equipment, it can only detect one or several relatively fixed specifications of silk screen plates, resulting in that the detection equipment is limited in the applicable specifications of silk screen plates. SUMMARY

[0003] In view of the above technical problems, the utility model provides a silk screen plate detection device which can detect silk screen plates of multiple specifications and improve the applicability of multi-specification silk screen plate detection.

[0004] The utility model embodiment provides the following scheme:

[0005] The utility model embodiment provides a silk screen plate detection device, and the device comprises:

[0006] A portal frame;

[0007] A first driving mechanism is arranged on the portal frame;

[0008] A detection camera is connected with the first driving mechanism, and the detection camera moves along the length direction of the portal frame under the traction of the first driving mechanism; the detection camera is used for shooting the silk screen plate below the portal frame and outputting a to-be-detected image;

[0009] A light transmission platform is arranged below the portal frame, and the light transmission platform is used for supporting the silk screen plate;

[0010] A light source is arranged below the light transmission platform, and the light source is used for supplementing light for the silk screen plate;

[0011] A second driving mechanism is connected with the light transmission platform, and the second driving mechanism is used for driving the light transmission platform to move perpendicularly to the length direction of the portal frame;

[0012] A processing terminal is connected with the image output port of the detection camera, and the processing terminal is used for outputting the detection result of the silk screen plate according to the to-be-detected image.

[0013] In an optional embodiment, a plurality of positioning protrusions are arranged on the outer periphery of the light transmission platform, and the positioning protrusions are used for positioning the silk screen plate.

[0014] In an alternative embodiment, the light-transmitting platform is provided with a clearance groove between two adjacent positioning protrusions, and the clearance groove is used for the user to take and place the screen printing plate.

[0015] In an alternative embodiment, the device further comprises:

[0016] A vertical adjustment mechanism is installed on the gantry, and a driving port of the vertical adjustment mechanism is connected to the processing terminal. The vertical adjustment mechanism is provided with a fixing seat for installing the detection camera.

[0017] A range finder is connected to the vertical adjustment mechanism, and an output port of the range finder is connected to the processing terminal. The range finder is used to measure the vertical distance between the range finder and the screen printing plate and output to the processing terminal.

[0018] In an alternative embodiment, the device further comprises:

[0019] A cushion block is installed on the vertical adjustment mechanism, and a preset inclined surface of the cushion block is connected to the range finder, so that the range-finding laser beams emitted and received by the range finder are within a preset angle range with the screen printing plate.

[0020] In an alternative embodiment, the light-transmitting platform is provided with a clearance groove between two adjacent positioning protrusions, and the clearance groove is used for the user to take and place the screen printing plate.

[0021] In an alternative embodiment, the device further comprises:

[0022] A clamping mechanism is arranged on the light-transmitting platform, and the clamping mechanism is used to fix the screen printing plate.

[0023] In an alternative embodiment, the clamping mechanism comprises:

[0024] A horizontal rod is arranged on one side of the light-transmitting platform.

[0025] A telescopic device is connected to the horizontal rod, and a control port of the telescopic device is connected to the processing terminal. The telescopic device is used to push the horizontal rod to fix the screen printing plate.

[0026] In an alternative embodiment, the clamping mechanism further comprises:

[0027] At least one inductive switch is arranged on the horizontal rod and closely contacts the plane of the screen printing plate. An output port of the inductive switch is connected to the processing terminal. The inductive switch is used to output an inductive signal to the processing terminal when the horizontal rod closely contacts the screen printing plate.

[0028] In an alternative embodiment, the clamping mechanism further comprises:

[0029] A sliding rail is arranged along the telescopic direction of the telescopic device, and the sliding rail is slidingly connected to the horizontal rod.

[0030] Compared with the prior art, the screen printing plate detection device has the following advantages:

[0031] The screen printing screen plate detection device of the utility model provides a vertical adjusting mechanism, a distance measuring instrument, a pad, a clamping mechanism, a first driving mechanism, a detection camera, a light transmission platform and a light source, and the first driving mechanism is arranged on the portal frame; the detection camera is connected with the first driving mechanism, and the detection camera moves along the length direction of the portal frame under the traction of the first driving mechanism; the detection camera is used for shooting the screen printing screen plate below the portal frame and outputting a to-be-inspected image; the light transmission platform is arranged below the portal frame, and the light transmission platform is used for supporting the screen printing screen plate; the light source is arranged below the light transmission platform, and the light source is used for light supplementing the screen printing screen plate; the second driving mechanism is connected with the light transmission platform, and the second driving mechanism is used for driving the light transmission platform to move perpendicularly to the length direction of the portal frame; the processing terminal is connected with the image output port of the detection camera, and the processing terminal is used for outputting the detection result of the screen printing screen plate according to the to-be-inspected image. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0033] Figure 1 A front view structural schematic diagram of the screen printing screen plate detection device provided by the utility model embodiment is shown in the figure.

[0034] Figure 2 A three-dimensional structural schematic diagram of the screen printing screen plate detection device provided by the utility model embodiment is shown in the figure.

[0035] Figure 3 An installation structural schematic diagram of the pad provided by the utility model embodiment is shown in the figure.

[0036] Figure 4 An installation structural schematic diagram of the light source provided by the utility model embodiment is shown in the figure.

[0037] Mark 1-portal frame, 2-detection camera, 3-screen printing screen plate, 4-light transmission platform, 5-light source, 6-second driving mechanism, 7-vertical adjusting mechanism, 8-distance measuring instrument, 9-pad, 10-clamping mechanism, 11-first driving mechanism, 12-distance measuring laser beam, 13-predefined slope.

[0038] 41-Positioning protrusion, 42-Clearing groove, 43-Panel, 44-Outer frame, 45-Glass,

[0039] 101-Horizontal bar, 102-Telescopic device, 103-Induction switch, 104-Slide rail. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the embodiments of the present utility model.

[0041] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a screen printing stencil inspection device provided in an embodiment of the present utility model. The inspection device includes a gantry frame, a first drive mechanism, an inspection camera, a light-transmitting platform, a light source, a second drive mechanism, and a processing terminal.

[0042] The gantry frame consists of two parallel columns, with a crossbeam at the top of each column. The gantry frame can be constructed by welding metal square tubing or by assembling metal profiles; no specific limitations are specified. The gantry frame can be mounted on a machine frame to form the main structure of the testing device.

[0043] The first drive mechanism can be a lead screw and nut structure, driven by a servo motor or stepper motor, and is mounted on the gantry. The motor operates under the control of the driver, driving the lead screw to rotate synchronously. Due to the threaded engagement between the nut and the lead screw, the rotational motion of the lead screw is converted into linear motion of the nut along the axis of the lead screw, which in turn drives the detection camera connected to the nut to move linearly along the length of the gantry, enabling the imaging of different positions on the screen printing stencil.

[0044] The inspection camera can be a line scan camera or other terminal device capable of machine vision imaging. The inspection camera is connected to the first drive mechanism and can be mounted on the first drive mechanism using a mounting bracket or fasteners. Under the traction of the first drive mechanism, the inspection camera moves along the length of the gantry, i.e. Figure 2 As shown in the X-axis, the inspection camera can be stopped at any position along the length of the gantry under the traction of the first drive mechanism. The inspection camera is used to photograph the screen printing plate under the gantry and output the image to be inspected.

[0045] The light-transmitting platform, made of glass or acrylic sheet, is located beneath the gantry frame and serves to support the screen printing stencil. Please refer to [link / reference]. Figure 2 , Figure 2It is a schematic diagram of the three-dimensional structure of the silk screen plate detection device. The light transmission platform includes a supporting plate, a glass and an outer frame. The middle part of the supporting plate is a hollow structure. The outer frame is installed on the supporting plate, and the glass is installed inside the outer frame. The light source is arranged below the light transmission platform, and the light source is used for supplementing light for the silk screen plate.

[0046] The second driving mechanism can also be a screw nut structure driven by a servo motor or a stepper motor. The second driving mechanism is connected with the light transmission platform, and is used for driving the light transmission platform to move vertically to the length direction of the gantry. Please continue to refer to Figure 2 , the second driving mechanism can also include a pair of parallel bearing rails, and the light transmission platform is installed on the bearing rails and driven by the motor to move vertically to the length direction of the gantry, i.e. Y direction shown in the figure.

[0047] The processing terminal can be a computer device or a server capable of implementing data processing, or a terminal control system composed of a controller and an upper computer. The processing terminal is connected with the image output port of the detection camera, and is used for outputting the detection result of the silk screen plate according to the detected image.

[0048] When detecting silk screen plates of different specifications, the silk screen plate to be detected is placed on the light transmission platform, and the light source is turned on. The light source irradiates the silk screen plate from the bottom through the light transmission platform. Ensure that the image captured by the detection camera is clear, bright and has enough detail information.

[0049] The first driving mechanism is started to drive the detection camera to move along the length direction of the gantry. During the movement, the detection camera captures the silk screen plate below to obtain image information of the silk screen plate at different positions in this direction. The second driving mechanism drives the light transmission platform to move vertically to the length direction of the gantry. The movement of the light transmission platform changes the position of the silk screen plate in another direction, so that the detection camera can capture each area of the silk screen plate and avoid blind area.

[0050] The detection camera transmits the detected image in real time to the processing terminal. After receiving the image, the processing terminal analyzes and processes the image according to the preset image processing algorithm and detection standard. For example, through image recognition technology, it can be detected whether there is blockage, damage and other problems on the silk screen plate. When detecting the blockage of the silk screen plate, the light emitted by the light source will pass through the mesh of the mesh surface, and the detection camera can capture the light spot at this position; on the contrary, if there is no light spot, it means that there is a blockage defect at this position.

[0051] It can be understood that, in the scheme, the first driving mechanism is arranged on the gantry, and the detection camera is moved along the length direction of the gantry by the first driving mechanism; the second driving mechanism is arranged below the gantry, and the silk screen plate is moved along the direction perpendicular to the length direction of the gantry by the first driving mechanism, which has better utilization in space. Compared with the traditional moving detection mode, the detection device can realize detection of a larger size of silk screen plate.

[0052] When the user performs the detection task of the silk screen plate, if the silk screen plate is placed randomly, the reference position of the placed silk screen plate needs to be determined, which consumes detection time. Based on this, in a specific embodiment, a plurality of positioning protrusions are arranged on the outer periphery of the light transmission platform, and the positioning protrusions are used for positioning the silk screen plate. Please continue to read Figure 2 , a plurality of positioning protrusions can be arranged along the reference right angle of the light transmission platform, the positioning protrusions are rectangular blocks, which are installed on the edge of the light transmission platform by means of countersunk bolts, and the side of the positioning protrusion close to the silk screen plate is chamfered. By positioning the silk screen plate by the positioning protrusions, it can be ensured that the silk screen plate is placed at the reference position on the light transmission platform each time, so that the images captured by the detection camera have consistency, reduce the detection error caused by the position deviation of the silk screen plate, thereby improving the detection accuracy and more accurately identifying the defects and abnormalities on the silk screen plate.

[0053] In actual application, since the silk screen plate is detected by user operation, it is not convenient to operate during the process of placing the silk screen plate horizontally on the light transmission platform. Based on this, an empty slot is arranged on the light transmission platform, the empty slot is located between two adjacent positioning protrusions, and the empty slot is used for the user to implement the taking and placing operation of the silk screen plate. The setting of the empty slot provides a taking and placing operation space for the operator, avoiding the hindering of the positioning protrusions to the taking and placing operation. The operator can more easily and accurately place the silk screen plate to the specified position on the light transmission platform, and take the silk screen plate from the platform, thereby improving the convenience and efficiency of the taking and placing operation.

[0054] Further, the detection device further comprises a vertical adjusting mechanism and a range finder, please continue to read Figure 1 and Figure 2The vertical adjusting mechanism is installed on the gantry, and a driving port of the vertical adjusting mechanism is connected to the processing terminal. A fixing seat for installing the detection camera is arranged on the vertical adjusting mechanism. The range finder is connected to the vertical adjusting mechanism, and an output port of the range finder is connected to the processing terminal. The range finder is used to measure the vertical distance between the range finder and the screen printing plate and output to the processing terminal. In the detection process of the large-size screen printing plate, the levelness of the screen on the screen printing plate is deviated, the distance between the range finder and the detection camera is fixed, and the vertical distance between the range finder and the screen can be measured to determine whether the vertical position of the detection camera is within the focal length. If the vertical position of the detection camera needs to be adjusted, the vertical adjusting mechanism can be controlled to adjust the vertical position of the detection camera.

[0055] With the precise cooperation of the vertical adjusting mechanism and the range finder, the detection camera can always be kept at the most suitable vertical position for shooting. This makes the screen printing plate image obtained by shooting clearer, more complete, and the details more rich, improves the detection ability of the fine defects (such as broken lines), and thus improves the detection accuracy, and provides a more reliable basis for the quality evaluation of the screen printing plate.

[0056] When the range finder is a laser range finder, because there is a distance between the laser emitting position and the laser receiving position of the laser range finder, after the vertically emitted ranging laser beam is reflected by the screen, the reflected light signal received by the range finder may be too weak, which affects the accuracy of ranging. Based on this, in a specific embodiment, the detection device further comprises a pad.

[0057] The pad is installed on the vertical adjusting mechanism, and a preset inclined surface of the pad is connected to the range finder, so that the ranging laser beam emitted and received by the range finder is within a preset angle range with the screen printing plate. Please refer to Figure 3 , Figure 3 for the schematic view of the mounting structure of the pad. The inclination degree of the preset inclined surface can be determined based on the distance between the laser emitting position and the laser receiving position on the range finder, so that the range finder can accurately receive the ranging laser beam. As shown in Figure 3 , by installing the pad, the range finder can have an inclination angle in the XOZ plane and the YOZ plane, and the stability of the range finder in receiving the reflected light signal is improved.

[0058] Because the detection camera moves along the length direction of the gantry, if the light emitting mode of the light source is not reasonably set, the image shot may have local over-bright or over-dark areas. Based on this, the light emitting surface of the light source is distributed along the length direction of the gantry, please refer to Figure 4The light supplementing mode can provide more uniform light for the screen printing plate, avoid local over-bright or over-dark conditions, and ensure that the image brightness captured by the detection camera is uniform and the details are clear. Whether it is a fine line or a complex pattern on the screen printing plate, it can be clearly presented, providing a high-quality image basis for subsequent image processing and defect detection, and further improving the detection accuracy.

[0059] For small-sized screen printing plates, due to their light weight, when the second driving mechanism moves the light transmission platform, the screen printing plate may be displaced, which not only damages the screen printing plate, but also affects the normal operation of the detection equipment. Based on this, in a specific embodiment, the detection device further comprises a clamping mechanism.

[0060] The clamping mechanism is arranged on the light transmission platform and is used to fix the screen printing plate. The clamping mechanism can include at least one air cylinder, for example, multiple air cylinders are arranged on the light transmission platform to form a multi-directional clamping structure. These air cylinders can be coordinated by mechanical linkages or electronic control systems to stably clamp the screen printing plate together.

[0061] For example, the clamping mechanism includes a horizontal rod and a telescopic device, please refer to Figure 2 , the horizontal rod is arranged on one side of the light transmission platform and is parallel to the X direction, and the telescopic device is arranged along the Y direction; the telescopic device is connected with the horizontal rod, and the control port of the telescopic device is connected with the processing terminal; the telescopic device is used to push the horizontal rod to fix the screen printing plate. The telescopic action of the telescopic device is controlled by the processing terminal, when the screen printing plate needs to be clamped, the telescopic device is controlled to retract, so that the horizontal rod tightly abuts against the side surface of the screen printing plate; after the detection of the screen printing plate is completed, the telescopic device is controlled to extend, so that the horizontal rod is separated from the screen printing plate. Through the cooperation of the horizontal rod and the telescopic device, uniform and stable fixing force can be provided for the screen printing plate, avoiding displacement and shaking of the screen plate during detection, so that the detection camera can capture clear and accurate images,

[0062] Further, the clamping mechanism further comprises at least one sensing switch. The sensing switch is arranged on the horizontal rod and tightly abuts against the plane of the screen printing plate, and the output port of the sensing switch is connected with the processing terminal. The sensing switch is used to output a sensing signal to the processing terminal when it senses that the horizontal rod tightly abuts against the screen printing plate. The sensing switch can be a mechanical micro switch, which protrudes from the plane of the screen printing plate. When the telescopic device is retracted, if the sensing switch is triggered, it indicates that the horizontal rod tightly abuts against the screen printing plate, and the telescopic device is controlled to stop.

[0063] To further ensure the stability of the operation of the clamping mechanism, the clamping mechanism further comprises a sliding rail. The sliding rail is arranged along the telescopic direction of the telescopic device and is slidably connected with the horizontal rod. The sliding rail provides accurate guidance for the horizontal rod, making the telescopic device push the horizontal rod to fix the screen printing plate more stable and reliable, and avoiding the offset and jamming of the horizontal rod.

[0064] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0065] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0066] In the present application, unless specifically defined and limited otherwise, the terms "connected", "fixed", and the like should be broadly understood, for example, "fixed" can be fixed connection, or detachable connection, or integral; "connected" can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be internal connection of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In addition, in the present application, the description such as "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless specifically defined otherwise.

Claims

1. A screen printing plate detection device, characterized by, The device comprises: a gantry; a first driving mechanism arranged on the gantry; a detection camera connected with the first driving mechanism, the detection camera moving along the length direction of the gantry under the traction of the first driving mechanism, the detection camera being used for shooting a screen printing plate under the gantry and outputting a to-be-inspected image; a light-transmitting platform arranged under the gantry, the light-transmitting platform being used for supporting the screen printing plate; a light source arranged under the light-transmitting platform, the light source being used for supplementing light for the screen printing plate; a second driving mechanism connected with the light-transmitting platform, the second driving mechanism being used for driving the light-transmitting platform to move perpendicularly to the length direction of the gantry; a processing terminal connected with the image output port of the detection camera, the processing terminal being used for outputting a detection result of the screen printing plate according to the to-be-inspected image.

2. The screen printing plate detection device according to claim 1, characterized in that A plurality of positioning protrusions are arranged on the periphery of the light-transmitting platform, the positioning protrusions being used for positioning the screen printing plate.

3. The screen printing plate detection device according to claim 2, wherein An emptying groove is arranged on the light-transmitting platform, the emptying groove being located between two adjacent positioning protrusions, the emptying groove being used for a user to implement a taking and placing operation on the screen printing plate.

4. The screen printing plate detection device according to claim 1, wherein The device further comprises: a vertical adjusting mechanism mounted on the gantry, a driving port of the vertical adjusting mechanism being connected with the processing terminal, the vertical adjusting mechanism being provided with a fixing seat on which the detection camera is mounted; a range finder connected with the vertical adjusting mechanism, an output port of the range finder being connected with the processing terminal, the range finder being used for measuring a vertical distance between the range finder and the screen printing plate and outputting to the processing terminal.

5. The screen printing plate detection device according to claim 4, wherein The device further comprises: a pad block mounted on the vertical adjusting mechanism, a preset inclined surface of the pad block being connected with the range finder, so that a ranging laser beam emitted and received by the range finder is in a preset angle range with the screen printing plate.

6. The screen printing plate detection device according to claim 1, wherein An emitting surface of the light source is distributed along the length direction of the gantry.

7. The screen printing plate detection device according to claim 1, wherein The device further comprises: a clamping mechanism arranged on the light-transmitting platform, the clamping mechanism being used for fixing the screen printing plate.

8. The screen printing plate detection device according to claim 7, wherein The clamping mechanism comprises: a horizontal rod arranged on one side of the light-transmitting platform; a telescopic device connected with the horizontal rod, a control port of the telescopic device being connected with the processing terminal, the telescopic device being used for pushing the horizontal rod to fix the screen printing plate.

9. The screen printing plate detection device according to claim 7, wherein The clamping mechanism further comprises: at least one inductive switch arranged on the horizontal rod and closely contacting a plane of the screen printing plate, an output port of the inductive switch being connected with the processing terminal, the inductive switch being used for outputting an inductive signal to the processing terminal when the horizontal rod closely contacts the screen printing plate.

10. The screen printing plate detection device according to claim 7, wherein The clamping mechanism further comprises: a slide rail arranged along the telescopic direction of the telescopic device, the slide rail being slidingly connected with the horizontal rod.

Images