A detection device and method for SMT template steel mesh

Abstract

The application relates to the technical field of detection devices, and discloses a detection device and method for SMT template steel meshes, which adopts an independent space, can reduce the influence of external factors on the detection of the SMT template steel meshes, is convenient for controlling the surrounding environment of the SMT template steel meshes, and enriches the detection range of the SMT template steel meshes; the detection device adopts a coloring form, improves the recognizable degree of defects on the SMT template steel meshes, and has better detection reliability; the detection device comprises a base and a detection system; the base is provided with a space creating structure; the detection system comprises an electric driving part; the electric driving part is arranged in the space creating structure; an adjusting frame is arranged on the electric driving part; a machine vision sensor is arranged at the bottom end of the adjusting frame; a rotating adjusting frame is rotatably connected to the adjusting frame; an electric adjusting rod is arranged on the adjusting frame; the adjusting rod of the electric adjusting rod is hinged to the rotating adjusting frame; a spanning frame is rotatably connected to the rotating adjusting frame; a cloth pipe and a scraping rod are arranged on the spanning frame.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and specifically to a testing device and method for SMT template stencils. Background Technology

[0002] As is well known, the main function of SMT stencils is to assist in solder paste deposition. Its purpose is to accurately transfer the correct amount of solder paste to the correct position on the empty PCB. The thickness of common SMT stencils ranges from 0.1mm to 0.25mm, and the common apertures are 0.2mm, 0.3mm, or 0.4mm. Based on this, it can be determined that the structure of SMT stencils is relatively precise. For precision structures, their structural characteristics are easily affected by external factors. Therefore, in order to measure the quality of SMT stencils, we propose an SMT stencil testing device and method.

[0003] A search revealed that Chinese patent application CN201521052118.5 discloses a visual inspection device for a mobile phone PCB board SMT stencil template. The device roughly comprises a base, a support, a light source, a lens, and a photosensitive device. A horizontal support is fixedly connected to the top of a vertical support, and a lens holder is fixedly connected to the other end of the horizontal support. A light source is fixedly mounted on the upper surface of the lens. The bottom of the vertical support is fixedly connected to the side wall of the base. A first platform is transparent, and a photosensitive device is fixedly mounted on the upper surface of a second platform. Multiple positioning devices are fixedly mounted on the upper surface of the first platform, and an alarm is fixedly mounted below the second platform. In use, a stencil and corresponding filling portions are placed on the first platform to form an opaque layer. The device utilizes the light from the light source and the photosensitive device to detect the light. To facilitate the inspection of stencils, Chinese patent application CN202323105990.9 discloses an inspection device for SMT stencils. The device generally includes four support bases, with a support frame fixedly connected to the top of each base. Four support columns are fixedly connected to the top of each support frame. Casters are mounted on the front of each support base. An inspection platform is fixedly connected to the top of each support column. Partitions are installed on the outer walls of each support column. During use, the vertical height can be effectively adjusted by the cooperation of a telescopic rod and a fixed sleeve. A rotating sleeve is rotatably connected to the top of the telescopic rod, allowing for horizontal adjustment as needed. The cooperation of a telescopic plate and an extension sleeve effectively extends the telescopic plate, facilitating the inspection of the stencil by a magnifying glass inside.

[0004] While the aforementioned existing technical solutions can provide a complete inspection for SMT stencils, the inspection process relies on direct inspection using a magnifying glass and lens. Considering the actual situation of SMT stencils, which are mostly single-color metal sheet structures, such as stainless steel SMT stencils, their surface is usually a metallic silver-gray. Therefore, the single silver-gray color makes it difficult to clearly distinguish defective areas from other areas. Consequently, simply using a magnifying glass and lens to directly inspect SMT stencils makes it difficult to differentiate defective areas, and the reliability of the inspection needs further improvement. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an inspection device and method for SMT stencils. It utilizes an independent space, reducing the impact of external factors on the inspection of the SMT stencil, and also facilitates control of the surrounding environment, thereby expanding the inspection range. Furthermore, the use of color coating improves the identifiability of defects on the SMT stencil, resulting in better inspection reliability and greater practicality.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an inspection device for SMT stencil mesh, comprising a base and an inspection system. A space-building structure is mounted on the base. The inspection system includes an electric drive component, which is installed within the space-building structure. A sliding frame is mounted on the electric drive component. A machine vision sensor is mounted at the bottom of the sliding frame. A rotating frame is rotatably connected to the sliding frame. An electric adjusting rod is mounted on the sliding frame. The adjusting rod of the electric adjusting rod is hinged to the rotating frame. A crossing frame is rotatably connected within the rotating frame. A fabric tube and a scraper are mounted on the crossing frame. A fabric strip hole is opened on the fabric tube. A cutting sleeve is fixedly connected within the rotating frame. The cutting sleeve matches the fabric strip hole. A first servo motor is mounted on the rotating frame. The first servo motor is used to drive the rotation of the crossing frame.

[0007] Preferably, the space-creating structure includes an outer frame and a follower frame. The outer frame is fixedly connected to the base. A lifting platform is slidably connected inside the outer frame. The lifting platform has a hollow cavity. Multiple air holes are opened at the top of the lifting platform, and all of the multiple air holes communicate with the hollow cavity. An electric lifting rod is installed inside the base. The lifting rod of the electric lifting rod is connected to the lifting platform. The lifting platform is connected to a first quick-connect pipe, a second quick-connect pipe, and a third quick-connect pipe. The follower frame is rotatably connected to the outer frame. The electric drive component is installed inside the follower frame. A sheet metal skin cover is installed outside the follower frame. A linkage component is installed between the outer frame and the follower frame. The linkage component is controlled by the lifting platform.

[0008] Preferably, the linkage component includes a follower frame and two external push bars. The follower frame is fixedly connected to the follower frame, and the two external push bars are fixedly connected to the lifting platform. A through shaft is provided in the strip-shaped opening on the follower frame, and the two external push bars are connected to the through shaft.

[0009] Preferably, the outer frame has an inner top recessed groove, and a horizontal air pipe is rotatably connected in the inner top recessed groove. The horizontal air pipe is connected to an extension quick-connect pipe, which passes through the outer frame and extends to the outside of the outer frame. The horizontal air pipe rotates in conjunction with the rotation of the follower frame. The horizontal air pipe is equipped with a horizontal recovery pipe, which is fixedly connected to the lifting platform. The horizontal recovery pipe is connected to a through quick-connect pipe, which passes through the lifting platform and extends to the bottom of the lifting platform.

[0010] Preferably, the follower frame is fixedly connected to a sector-shaped external gear, the sector-shaped external gear meshes with a transmission gear, and the transmission gear is connected to the horizontal air pipe.

[0011] Preferably, an eccentric cylinder is fixedly connected to the outside of the transmission gear, and a connecting spring is fixedly connected inside the eccentric cylinder. The connecting spring is fixedly connected to the horizontal air pipe.

[0012] Preferably, the electric drive component includes a threaded rod, a second servo motor, and two optical rods. The threaded rod, the second servo motor, and the two optical rods are all installed in the follower frame. The second servo motor is used to drive the rotation of the threaded rod. A threaded sleeve is threadedly connected to the threaded rod. The threaded sleeve is fixedly connected to the sliding frame. The sliding frame has two sliding holes, and the two optical rods are respectively in sliding engagement with the two sliding holes.

[0013] Preferably, drive gears are installed on the output shafts of the first servo motor and the second servo motor, and driven gears are installed on the threaded rod and the crossbar, with the two drive gears meshing with the two driven gears respectively.

[0014] Preferably, pressure sensors are installed at the four corners of the follower frame. When the follower frame rotates and closes relative to the outer frame, all four pressure sensors generate readings.

[0015] A testing method for an SMT stencil mesh testing device includes the following steps:

[0016] S1. Before use, first install control circuits for the space construction structure, electric drive components, machine vision sensor, electric adjustment rod and first servo motor. Then install a pigment supply pipe to connect the cloth tube to the outside. Next, install a processing computer for the machine vision sensor. The information collected by the machine vision sensor can be processed by the software in the processing computer that matches the machine vision sensor.

[0017] S2. During the inspection operation, the SMT template steel mesh to be inspected is first placed into the space by the operation of the space creation structure. Then, the space creation structure is controlled to form a closed space around the placed SMT template steel mesh. After that, the electric drive is controlled to adjust the position of the sliding frame. Then, the electric adjustment rod is used to rotate and lower the adjustment frame relative to the sliding frame, so that the cross frame and the SMT template steel mesh to be inspected are brought closer together.

[0018] S3. During the process of the crossing frame approaching the SMT stencil mesh to be tested, the first servo motor is powered on to realize the rotation adjustment of the crossing frame, so that the fabric strip hole on the fabric tube rotates away from the cutting sleeve. After the fabric strip hole rotates away from the cutting sleeve, the external pigment supply tube can form pigment placement relative to the SMT stencil mesh to be tested through the fabric strip hole. After the pigment placement is completed, the first servo motor is powered on to realize the rotation adjustment of the crossing frame, and controls the fabric strip hole to rotate again and retract into the cutting sleeve.

[0019] S4. Next, control the first servo motor and the electric adjusting rod to run synchronously, so that the scraper rod is in close contact with the SMT stencil mesh to be inspected. Then, the spatial creation structure is matched with the SMT stencil mesh to be inspected to form an adsorption positioning. The electric drive component runs to realize the movement drive of the scraper rod relative to the SMT stencil mesh to be inspected, so as to scrape the pigment on the SMT stencil mesh to be inspected, so that the pigment is spread flat on the SMT stencil mesh to be inspected. The machine vision sensor is matched with the SMT stencil mesh to be inspected to detect the flatness quality of the spread pigment on the SMT stencil mesh to be inspected.

[0020] Compared with the prior art, the present invention provides a detection device and method for SMT stencil mesh, which has the following beneficial effects:

[0021] (1) In this invention, the detection system is designed to form a corresponding detection structure with the SMT template steel mesh. The use of coloring improves the identifiability of defects on the SMT template steel mesh and enhances the detection reliability.

[0022] (2) In this invention, by matching the space construction structure, a corresponding support and storage structure is provided for the SMT template steel mesh, and an independent space is adopted, which can reduce the influence of external factors on the detection of the SMT template steel mesh, and at the same time facilitate the control of the surrounding environment of the SMT template steel mesh, thereby enriching the detection range of the SMT template steel mesh and making it more practical. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural schematic diagram showing a partial cross-section of the present invention;

[0024] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the local structure at point A;

[0025] Figure 3 For the present invention Figure 1 A magnified view of the structure at point B in the middle;

[0026] Figure 4 This is a three-dimensional structural diagram of the entire invention;

[0027] Figure 5 This is a three-dimensional structural diagram of the lifting platform of the present invention in the raised state;

[0028] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the local structure at point C;

[0029] Figure 7 For the present invention Figure 5 A magnified schematic diagram of the local structure at point D;

[0030] Figure 8 For the present invention Figure 5 A magnified schematic diagram of the local structure at point E;

[0031] Figure 9 This is a three-dimensional structural diagram of the cooperation between the adjustment frame and the electric adjustment rod of the present invention;

[0032] Figure 10 This is a rear view of the three-dimensional structure of the lifting platform of the present invention in the raised state.

[0033] Figure 11 This is a three-dimensional structural diagram showing the combination of the shift frame, electric adjustment rod, and crossing frame of the present invention.

[0034] Figure 12 This is a partial cross-sectional three-dimensional structural diagram of the cooperation of the cross-frame, the material distribution tube, and the scraper rod of the present invention;

[0035] Figure 13 This is a three-dimensional structural diagram of the base and the outer frame of the present invention in relative cooperation;

[0036] Figure 14 This is a three-dimensional structural diagram of the base and the outer frame of the present invention from another angle.

[0037] Figure 15 This is a three-dimensional structural diagram of the coordination of the follower frame, external push bar, and through shaft of the present invention.

[0038] In the diagram: 1. Base; 2. Sliding frame; 3. Adjustment frame; 4. Electric adjustment rod; 5. Crossover frame; 6. Fabric tube; 7. Scraper rod; 8. Fabric strip hole; 9. Cutting sleeve; 10. First servo motor; 11. Outer frame; 12. Follow-up frame; 13. Lifting platform; 14. Air vent; 15. Electric lifting rod; 16. First quick-connect pipe; 17. Second quick-connect pipe; 18. Third quick-connect pipe; 19. Sheet metal cover; 20. 21. Follower frame; 22. External push bar; 23. Through shaft; 24. Inner top recessed groove; 25. Horizontal air pipe; 26. Extending quick-connect pipe; 27. Horizontal recovery pipe; 28. Through quick-connect pipe; 29. ​​Sector-shaped external gear; 30. Transmission gear; 31. Eccentric cylinder; 32. Connecting spring; 33. Threaded rod; 34. Second servo motor; 35. Guide bar; 36. Threaded sleeve; 37. Drive gear; 38. Driven gear; 39. Pressure sensor. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] For examples, please refer to Figures 1-15A detection device for SMT stencil mesh includes a base 1 and a detection system. A spatial structure is mounted on the base 1. The detection system includes an electric drive unit installed within the spatial structure. A sliding frame 2 is mounted on the electric drive unit, and a machine vision sensor is mounted at the bottom of the sliding frame 2. A rotating frame 3 is rotatably connected to the sliding frame 2. An electric adjusting rod 4 is mounted on the sliding frame 2, and its adjusting rod is hinged to the rotating frame 3. A crossing frame 5 is rotatably connected inside the rotating frame 3. A material feeding tube 6 and a scraper rod 7 are mounted on the crossing frame 5. The material feeding tube 6 has material strip holes 8. A cutting sleeve 9 is fixedly connected inside the rotating frame 3, and the cutting sleeve 9 matches the material strip holes 8. A first servo motor is mounted on the rotating frame 3. The motor 10, the first servo motor 10, is used to drive the rotation of the crossover frame 5. Through the design of the detection system, it can be matched with the SMT template stencil to form a corresponding detection structure. The use of color coating improves the identifiability of defects on the SMT template stencil and improves the detection reliability. The electric drive component includes a threaded rod 32, a second servo motor 33, and two optical bars 34. The threaded rod 32, the second servo motor 33, and the two optical bars 34 are all installed in the follower frame 12. The second servo motor 33 is used to drive the rotation of the threaded rod 32. A threaded sleeve 35 is threadedly connected to the threaded rod 32. The threaded sleeve 35 is fixedly connected to the sliding frame 2. Two sliding holes are opened on the sliding frame 2. The two optical bars 34 are slidably engaged with the two sliding holes respectively.

[0041] It should be further explained that the spatial construction structure includes an outer frame 11 and a follower frame 12. The outer frame 11 is fixedly connected to the base 1. A lifting platform 13 is slidably connected inside the outer frame 11. The lifting platform 13 has a hollow cavity. Multiple air distribution holes 14 are opened at the top of the lifting platform 13, and all the air distribution holes 14 are connected to the hollow cavity. An electric lifting rod 15 is installed inside the base 1. The lifting rod of the electric lifting rod 15 is connected to the lifting platform 13. The lifting platform 13 is connected to a first quick-connect pipe 16, a second quick-connect pipe 17, and a third quick-connect pipe 18. The follower frame 12 is connected to the outer frame 11. The frame 11 is rotatably connected, and the electric drive component is installed inside the follower frame 12. A sheet metal cover door 19 is installed on the outside of the follower frame 12. A linkage component is installed between the outer frame 11 and the follower frame 12. The linkage component is controlled by the lifting platform 13. The linkage component includes a follower connecting frame 20 and two external push bars 21. The follower connecting frame 20 is fixedly connected to the follower frame 12, and the two external push bars 21 are fixedly connected to the lifting platform 13. A through shaft 22 is provided in the strip-shaped opening on the follower connecting frame 20, and the two external push bars 21 are connected to the through shaft 22. An inner top recess is provided on the outer frame 11. A horizontal air pipe 24 is rotatably connected to a groove 23, which is recessed into the groove 23. The horizontal air pipe 24 is connected to an extension quick-connect pipe 25, which passes through the outer frame 11 and extends to the outside of the outer frame 11. The horizontal air pipe 24 rotates in conjunction with the rotation of the follower frame 12. The horizontal air pipe 24 is equipped with a horizontal recovery pipe 26, which is fixedly connected to the lifting platform 13. The horizontal recovery pipe 26 is connected to a through quick-connect pipe 27, which passes through the lifting platform 13 and extends to the bottom of the lifting platform 13. A sector-shaped external gear 28 is fixedly connected to the follower frame 12. An external gear 28 meshes with a transmission gear 29, which is connected to a horizontal air pipe 24. An eccentric cylinder 30 is fixedly connected to the outside of the transmission gear 29, and a connecting spring 31 is fixedly connected inside the eccentric cylinder 30. The connecting spring 31 is fixedly connected to the horizontal air pipe 24. Through the matching of the space-creating structure, a corresponding support and storage structure is provided for the SMT template stencil. The use of an independent space can reduce the impact of external factors on the inspection of the SMT template stencil, and also facilitate the control of the surrounding environment of the SMT template stencil, thereby enriching the inspection range of the SMT template stencil and making it more practical.

[0042] Furthermore, it should be noted that drive gears 36 are installed on the output shafts of the first servo motor 10 and the second servo motor 33, and driven gears 37 are installed on the threaded rod 32 and the crossover frame 5. The two drive gears 36 mesh with the two driven gears 37 respectively. Through the meshing of the two drive gears 36 with the two driven gears 37 respectively, the rotation drive and control of the crossover frame 5 can be realized when the first servo motor 10 is running, and the rotation drive and control of the threaded rod 32 can be realized when the second servo motor 33 is powered on. Pressure sensors 38 are installed at the four corners of the follower frame 12. When the follower frame 12 rotates and closes relative to the outer frame 11, the four pressure sensors 38 will generate readings. By judging the readings of the four pressure sensors 38, it can be determined whether the follower frame 12 has formed a good closure relative to the outer frame 11.

[0043] In this embodiment, the first servo motor 10, the electric lifting rod 15, the second servo motor 33, the machine vision sensor, and the electric adjusting rod 4 are all commercially available conventional devices known to those skilled in the art. In this invention, we are simply using them without making any improvements to their structure or function. Their setting method, installation method, and electrical connection method can be easily explained by those skilled in the art by following the instructions for use. Therefore, we will not elaborate on them here.

[0044] In summary, the working principle of the SMT stencil detection device and method is as follows: Before use, control circuits are first installed for the first servo motor 10, electric lifting rod 15, second servo motor 33, machine vision sensor, and electric adjusting rod 4. Then, a pigment supply pipe connecting to the outside is installed for the fabric tube 6. Next, a processing computer is installed for the machine vision sensor. The software in the processing computer, matched with the machine vision sensor, enables the display and processing of information collected by the machine vision sensor. This is followed by the installation of the first quick-connect pipe 16, second quick-connect pipe 17, and third quick-connect pipe. 18. Each of the three independent air pumps is equipped with a high-pressure air pump connected to the extended quick-connect pipe 25, and a recovery air pump connected to the through quick-connect pipe 27. In actual use, the three independent air pumps can respectively perform gas pumping or gas extraction operations on the first quick-connect pipe 16, the second quick-connect pipe 17, and the third quick-connect pipe 18. When the three independent air pumps respectively perform gas pumping operations on the first quick-connect pipe 16, the second quick-connect pipe 17, and the third quick-connect pipe 18, compressed air will be ejected through the gas distribution hole 14. When the three independent air pumps respectively perform gas pumping operations on the first quick-connect pipe 16, the second quick-connect pipe 17, and the third quick-connect pipe 18, compressed air will be ejected through the gas distribution hole 14. When the quick-connect pipe 18 performs gas extraction, a negative pressure state will be formed near the gas distribution hole 14. At this time, the SMT stencil mesh attached to the lifting platform 13 will be in an adsorption and positioning state. By controlling the number of three independent air pumps and their pumping and extraction modes, the temperature of the environment above the gas distribution hole 14 can be assisted in regulating. It also allows the SMT stencil mesh to maintain its adsorption and positioning state while forming air exchange within the lifting platform 13. This enables testing of the SMT stencil mesh under different temperature conditions. For example, by controlling the three independent air pumps... The operation of the air pump ensures that both the first quick-connect pipe 16 and the second quick-connect pipe 17 are in a gas extraction state, while the third quick-connect pipe 18 is in a gas pumping state. The temperature of the gas pumped into the third quick-connect pipe 18 is heated or lowered, thereby achieving heat exchange inside the lifting platform 13 and maintaining a negative pressure state in the vicinity of the gas distribution hole 14. This allows the SMT template steel mesh to be tested to be in an adsorption and positioning state on the lifting platform 13, and the temperature of the SMT template steel mesh to be tested to be controlled, so as to detect the expansion and contraction of the SMT template steel mesh to be tested at different temperatures.

[0045] During the inspection process, the SMT stencil mesh to be inspected is first placed into the space by the operation of the spatial construction structure. Then, the spatial construction structure is controlled to form a closed space around the placed SMT stencil mesh. The operation of the spatial construction structure is as follows: First, the electric lifting rod 15 is powered on, raising the height of the lifting platform 13 within the outer frame 11. The lifting platform 13 drives the two external push rods 21 to rise synchronously. The rise of the two external push rods 21 pushes the follower frame 20 through the through shaft 22, thereby causing the follower frame 12 to rotate and rise relative to the outer frame 11. This creates an insertion channel between the outer frame 11 and the follower frame 12 that matches the SMT stencil mesh to be inspected. During the rotation of the moving frame 12, the sector-shaped external gear 28 will also rotate synchronously. Under the meshing transmission between the sector-shaped external gear 28 and the transmission gear 29, the transmission gear 29 will rotate synchronously with the rotation of the sector-shaped external gear 28, thereby driving the rotation of the horizontal air pipe 24. Since the transmission between the transmission gear 29 and the horizontal air pipe 24 is achieved through the transmission of the connecting spring 31, the sector-shaped external gear 28 can still rotate even when the horizontal air pipe 24 is stuck or rotated to its rotation limit position, which improves the operational safety of the sector-shaped external gear 28. Furthermore, to prevent the meshing transmission between the sector-shaped external gear 28 and the transmission gear 29 from being affected by external factors, a matching device can be installed on the outer frame 11. A protective cover is installed to protect the external sector gear 28 from the transmission gear 29. After the SMT stencil mesh to be tested is placed on the lifting platform 13, the high-pressure air pump and the recovery air pump are started. The high-pressure air pump pumps compressed air into the horizontal air pipe 24 through the extended quick-connect pipe 25, and the recovery air pump provides negative pressure adsorption near the horizontal recovery pipe 26 through the through quick-connect pipe 27. The electric lifting rod 15 controls the lifting platform 13 to fall, which also causes the follower frame 12 to rotate and fall, and the horizontal air pipe 24 to rotate accordingly. During the rotation and fall of the follower frame 12, once the follower frame 12 makes rotational contact with the outer frame 11, the space around the SMT stencil mesh to be tested is sealed off. The rotating horizontal air pipe 24 blows air from near to far to clean the dust on the upper surface of the SMT stencil to be tested. The horizontal recovery pipe 26, in conjunction with the horizontal air pipe 24, absorbs and cleans the dust on the upper surface of the SMT stencil to be tested. Then, the electric drive is controlled to adjust the position of the sliding frame 2. Due to the threaded transmission between the threaded rod 32 and the threaded sleeve 35, the second servo motor 33 is powered on and can move and adjust the threaded sleeve 35 relative to the follower frame 12. This allows the sliding frame 2 to move and adjust within the follower frame 12. Then, the electric adjustment rod 4 is used to rotate and lower the adjustment frame 3 relative to the sliding frame 2, so that the crossover frame 5 moves closer to the SMT stencil to be tested.

[0046] As the traversing frame 5 approaches the SMT stencil to be inspected, the first servo motor 10 is energized to rotate and adjust the traversing frame 5, causing the fabric strip hole 8 on the fabric strip tube 6 to rotate away from the cutting sleeve 9. Once the fabric strip hole 8 has rotated away from the cutting sleeve 9, the external pigment supply tube can then apply pigment through the fabric strip hole 8 relative to the SMT stencil to be inspected. After the pigment application is complete, the first servo motor 10 is energized to rotate and adjust the traversing frame 5, controlling the fabric strip hole 8 to rotate again and retract into the cutting sleeve 9. Thereafter, the sealing effect of the cutting sleeve 9 seals the fabric strip hole 8. To prevent pigment from continuing to flow out of the fabric strip holes 8, the first servo motor 10 and the electric adjusting rod 4 are then controlled to operate synchronously, so that the scraper rod 7 forms a near-contact state with the SMT stencil to be inspected. Typically, the minimum distance between the scraper rod 7 and the SMT stencil to be inspected while rotating is between 0.2mm and 0.5mm. This distance needs to be adjusted according to the viscosity of the pigment; that is, within a certain range, the thicker the pigment, the larger the distance. Then, the space-creation structure forms an adsorption and positioning system with the SMT stencil to be inspected, and the electric drive unit operates to scrape the pigment. The movement of rod 7 relative to the SMT stencil to be inspected is driven to scrape the pigment on the SMT stencil, causing the pigment to spread evenly on the stencil. A machine vision sensor is used to detect the planar quality of the SMT stencil based on the spread of pigment. Because the pigment, in its flat state, will cover the surface of the SMT stencil, and because the scraper rod 7 will smooth the surface of the pigment, if the surface of the SMT stencil to be inspected has poor levelness or defects such as pits, it will be detected. The pigment on the surface of the SMT stencil to be inspected will have an uneven thickness. Therefore, by collecting the color depth of the pigment using a machine vision sensor, the quality of the SMT stencil to be inspected can be assessed. That is, the pigment layer is thicker in areas with lighter pigment color than in areas with darker pigment color. On the SMT stencil to be inspected, the areas with lighter pigment color appear relatively raised, and vice versa. The pigment should be selected with a color that has a large color difference from the surface of the SMT stencil to be inspected. At the same time, water-soluble pigment should be selected to facilitate the later cleaning of the pigment.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing device for SMT stencil mesh, comprising a base (1), characterized in that, It also includes a detection system. A space-building structure is installed on the base (1). The detection system includes an electric drive unit. The electric drive unit is installed inside the space-building structure. A sliding frame (2) is installed on the electric drive unit. A machine vision sensor is installed at the bottom of the sliding frame (2). A rotating frame (3) is rotatably connected to the sliding frame (2). An electric adjusting rod (4) is installed on the sliding frame (2). The adjusting rod of the electric adjusting rod (4) is hinged to the rotating frame (3). A crossing frame (5) is rotatably connected inside the rotating frame (3). A fabric tube (6) and a scraper rod (7) are installed on the crossing frame (5). A fabric strip hole (8) is opened on the fabric tube (6). A cutting sleeve (9) is fixedly connected inside the rotating frame (3). The cutting sleeve (9) matches the fabric strip hole (8). A first servo motor (10) is installed on the rotating frame (3). The first servo motor (10) is used to drive the rotation of the crossing frame (5). The space-building structure includes an outer periphery. The frame (11) and the follower frame (12) are fixedly connected. The outer frame (11) is slidably connected to the base (1). The lifting platform (13) is provided with a hollow cavity inside the lifting platform (13). Multiple gas distribution holes (14) are opened at the top of the lifting platform (13). The multiple gas distribution holes (14) are all connected to the hollow cavity. An electric lifting rod (15) is installed in the base (1). The lifting rod of the electric lifting rod (15) is connected to the base (1). The lifting platform (13) is connected, and the lifting platform (13) is connected to the first quick-connect pipe (16), the second quick-connect pipe (17) and the third quick-connect pipe (18). The follower frame (12) is rotatably connected to the outer frame (11). The electric drive component is installed inside the follower frame (12). A sheet metal cover door (19) is installed outside the follower frame (12). A linkage component is installed between the outer frame (11) and the follower frame (12). The linkage component is controlled by the lifting platform (13). The first servo motor (10) is powered on and operates to rotate and adjust the crossover frame (5), causing the fabric strip hole (8) on the fabric tube (6) to rotate away from the cutting sleeve (9). After the fabric strip hole (8) rotates away from the cutting sleeve (9), the external pigment supply tube can form pigment placement relative to the SMT template stencil to be tested through the fabric strip hole (8). After the pigment placement is completed, the first servo motor (10) is powered on and operates to rotate and adjust the crossover frame (5), controlling the fabric strip hole (8) to rotate again and retract into the cutting sleeve (9). Thereafter, due to the sealing and blocking effect of the cutting sleeve (9), a tight seal can be formed on the fabric strip hole (8). The seal is used to prevent the pigment from continuing to flow out of the fabric strip hole (8). Then, the first servo motor (10) and the electric adjusting rod (4) are controlled to run synchronously so that the scraper rod (7) forms a near contact state with the SMT stencil mesh to be tested. The electric drive unit runs to realize the motion drive of the scraper rod (7) relative to the SMT stencil mesh to be tested, so as to scrape the pigment on the SMT stencil mesh to be tested, so that the pigment forms a flat layer on the SMT stencil mesh to be tested. The machine vision sensor is used to detect the flat quality of the SMT stencil mesh to be tested by the flat pigment on the SMT stencil mesh to be tested.

2. The detection device for SMT stencil mesh according to claim 1, characterized in that, The linkage component includes a follower frame (20) and two external push bars (21). The follower frame (20) is fixedly connected to the follower frame (12), and the two external push bars (21) are fixedly connected to the lifting platform (13). A through shaft (22) is provided in the strip opening on the follower frame (20), and the two external push bars (21) are connected to the through shaft (22).

3. The detection device for SMT stencil mesh according to claim 2, characterized in that, The outer frame (11) is provided with an inner top recessed groove (23), and a horizontal air pipe (24) is rotatably connected in the inner top recessed groove (23). The horizontal air pipe (24) is connected to an extension quick-connect pipe (25). The extension quick-connect pipe (25) passes through the outer frame (11) and extends to the outside of the outer frame (11). The horizontal air pipe (24) rotates in conjunction with the rotation of the follower frame (12). The horizontal air pipe (24) is equipped with a horizontal recovery pipe (26). The horizontal recovery pipe (26) is fixedly connected to the lifting platform (13). The horizontal recovery pipe (26) is connected to a through quick-connect pipe (27). The through quick-connect pipe (27) passes through the lifting platform (13) and extends to the bottom of the lifting platform (13).

4. The detection device for SMT stencil mesh according to claim 3, characterized in that, The follower frame (12) is fixedly connected to a sector-shaped external gear (28), which meshes with a transmission gear (29), and the transmission gear (29) is connected to the horizontal air pipe (24).

5. The detection device for SMT stencil mesh according to claim 4, characterized in that, An eccentric cylinder (30) is fixedly connected to the outside of the transmission gear (29), and a connecting spring (31) is fixedly connected inside the eccentric cylinder (30). The connecting spring (31) is fixedly connected to the horizontal air pipe (24).

6. The detection device for SMT stencil mesh according to claim 5, characterized in that, The electric drive unit includes a threaded rod (32), a second servo motor (33), and two optical rods (34). The threaded rod (32), the second servo motor (33), and the two optical rods (34) are all installed in the follower frame (12). The second servo motor (33) is used to drive the rotation of the threaded rod (32). A threaded sleeve (35) is threadedly connected to the threaded rod (32). The threaded sleeve (35) is fixedly connected to the sliding frame (2). Two sliding holes are opened on the sliding frame (2). The two optical rods (34) are respectively in sliding fit with the two sliding holes.

7. The detection device for SMT stencil mesh according to claim 6, characterized in that, A drive gear (36) is installed on the output shaft of the first servo motor (10) and the output shaft of the second servo motor (33). A driven gear (37) is installed on the threaded rod (32) and the cross frame (5). The two drive gears (36) mesh with the two driven gears (37) respectively.

8. The detection device for SMT stencil mesh according to claim 7, characterized in that, Pressure sensors (38) are installed at the four corners of the follower frame (12). When the follower frame (12) rotates and closes relative to the outer frame (11), all four pressure sensors (38) generate readings.

9. A testing method for an SMT stencil mesh testing device, characterized in that, The testing device for an SMT stencil mesh according to any one of claims 1-8 includes the following steps: S1. Before use, first install control circuits for the space construction structure, electric drive components, machine vision sensor, electric adjustment rod (4) and first servo motor (10), then install a pigment supply pipe connected to the outside world for the cloth tube (6), and then install a processing computer for the machine vision sensor. The processing computer can process the information collected by the machine vision sensor through the software matched with the machine vision sensor. S2. During the inspection operation, the SMT template steel mesh to be inspected is first placed into the space by the operation of the space creation structure. Then, the space creation structure is controlled to form a closed space around the placed SMT template steel mesh. After that, the electric drive is controlled to adjust the position of the sliding frame (2). Then, the electric adjustment rod (4) is used to rotate the adjustment frame (3) relative to the sliding frame (2) and make the crossing frame (5) close to the SMT template steel mesh to be inspected. S3. During the process of the crossing frame (5) approaching the SMT template stencil to be tested, the first servo motor (10) is powered on to realize the rotation adjustment of the crossing frame (5), so that the fabric strip hole (8) on the fabric tube (6) rotates away from the cutting sleeve (9). After the fabric strip hole (8) rotates away from the cutting sleeve (9), the external pigment supply tube can form pigment placement relative to the SMT template stencil to be tested through the fabric strip hole (8). After the pigment placement is completed, the first servo motor (10) is powered on to realize the rotation adjustment of the crossing frame (5), and controls the fabric strip hole (8) to rotate again and be put into the cutting sleeve (9). S4. Next, control the first servo motor (10) and the electric adjusting rod (4) to run synchronously, so that the scraper rod (7) forms a near contact state with the SMT stencil mesh to be tested. Then, the space creation structure is matched with the SMT stencil mesh to be tested to form an adsorption positioning. The electric drive unit runs to realize the motion drive of the scraper rod (7) relative to the SMT stencil mesh to be tested, so as to scrape the pigment on the SMT stencil mesh to be tested, so that the pigment forms a flat layer on the SMT stencil mesh to be tested. The machine vision sensor is matched with the SMT stencil mesh to be tested to detect the flatness quality of the flat pigment forming the SMT stencil mesh to be tested.

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