Printing system and post-printing detection device and method thereof

Abstract

The invention provides a printing system and a post-printing detection device and method thereof applied to the field of printed circuit boards, and the printing system comprises a rack and a printing module, the rack is provided with a circulating feeding box, the circulating feeding box is internally provided with a retainer plate, the retainer plate comprises a lower retainer plate and an upper retainer plate, the retainer plate is provided with a negative pressure hole and a centering locking mechanism, and the lower retainer plate is provided with a negative pressure hole. And the circulating feeding box is used for conveying the lower supporting plate to do reciprocating motion in the horizontal direction, and the circulating feeding box is further used for conveying the upper supporting plate to do superposed motion of reciprocating motion in the horizontal direction and reciprocating motion in the vertical direction. When the printed circuit board is conveyed, the centering position of the printed circuit board can be automatically finely adjusted and locked, the accuracy of the printing position of the printed circuit board in the silk-screen printing process is effectively improved, and the device has market prospects and is suitable for application and popularization.

Description

Technical Field

[0001] The present application relates to the field of printed circuit boards, and in particular to a printing system and a post-printing detection device and method thereof. Background Art

[0002] Screen printing is a common process for printed circuit boards (PCBs) that is used to paste conductive ink or solder paste onto the surface of a circuit board to form a circuit pattern. This method is usually used for component pin locations, connector locations, etc. on printed circuit boards. The existing screen printing equipment for printed circuit boards needs to be equipped with a specific mechanical fixture to fix the position of the printed circuit board to be printed on the bottom of the screen printing equipment. The mechanical fixture usually adopts mechanical structures such as screws and rockers to clamp and release the circuit board by adjusting the position of the screws or rockers. However, as the requirements for the volume and weight of electronic products continue to increase, the thickness of the printed circuit board is usually also reduced. The clamping part of this type of mechanical clamp is usually of fixed thickness, which cannot meet the clamping and positioning requirements of PCB boards of different thicknesses. For example, when the clamping part of the mechanical clamp is thicker than the PCB board, the slurry for screen printing will be smeared onto the upper surface of the clamp, or the screen board will be resisted by the protrusion of the clamp, causing the screen to deform, thereby affecting the printing quality. When the clamping part of the mechanical clamp is thinner than the PCB board, the local stress of the PCB board being clamped will be large, causing the PCB board to deform as a whole, which will also affect the printing quality. The existing clamp design can no longer meet the clamping requirements of thinning printed circuit boards. For this reason, a printing system and a post-printing detection device and method thereof are proposed. Summary of the invention

[0003] The purpose of the present application is to solve the technical problem that the existing screen printing fixture cannot adapt to the clamping requirements of PCBs of different thicknesses, which affects the printing quality. Compared with the existing technology, a printing system is provided, including a frame and a printing module, the frame is also provided with a circulating feed box, the circulating feed box is provided with a supporting plate, the supporting plate includes a lower supporting plate and an upper supporting plate, and the supporting plate is provided with a plurality of negative pressure holes arranged in an equidistant array and a plurality of centering locking mechanisms arranged in an equidistant array; The support plate is provided with a negative pressure bin and a positive pressure bin through a partition, and one side of the support plate is also provided with a positive pressure air pipe and a negative pressure air pipe, the positive pressure air pipe is connected with the positive pressure bin, the negative pressure air pipe is connected with the negative pressure bin, the negative pressure bin provides negative pressure for the negative pressure hole, and the positive pressure bin provides positive pressure for the centering locking mechanism; The circulating feed box is used to convey the lower pallet to reciprocate in the horizontal direction, and the circulating feed box is also used to convey the upper pallet to perform horizontal reciprocating motion and vertical reciprocating motion in a superimposed manner.

[0004] Preferably, first slide blocks are fixed on both sides of the upper support plate, and an upper slide rail matching the first slide blocks is provided on the top of the circulating feed box; Slide seats are fixed on both sides of the lower support plate, and support seats are provided at the bottom of the slide seats. A height guide rail is fixed on the top of the support seat, and a slide groove matching the height guide rail is provided on the slide seat. A second slider is fixed on the bottom of the support seat, and a lower slide rail matching the second slider is provided at the bottom of the circulating feed box. A guide wheel is also rotatably connected between the lower support plate and the slide seat, and a lower slide rail matching the guide wheel is fixed at the bottom of the circulating feed box, and a U-shaped notch is provided on the top of the lower slide rail. The inner wall of the circulating feed box is symmetrically rotatably connected to a transmission belt, and the transmission belt is driven to reciprocate by a reciprocating motor. The upper support plate is fixed to the top belt side of the transmission belt, and the support seat on the lower support plate is fixed to the bottom belt side of the first slider.

[0005] Preferably, the centering locking mechanism comprises a conduit inserted into the negative pressure chamber and the positive pressure chamber, the top inner wall of the conduit is rotatably connected to a rotating column, and the top of the rotating column is limitedly slidably connected to a lifting column through a spline groove structure; An eccentric shift plate is fixed on the top of the lifting column, an air guide tube is fixed on the bottom of the lifting column, a steering bin is arranged in the lifting column, the top end of the air guide tube extends into the steering bin, the bottom end of the air guide tube extends through the rotating column and is rotatably connected to a push diaphragm, and a tension spring is arranged between the push diaphragm and the rotating column; The bottom of the steering bin is provided with a plurality of release ports, the rotating column is provided with a sealing convex edge matching the release ports, the bottom of the rotating column is also provided with a plurality of push-rotation air channels arranged at equal angles, the conduit is also provided with a plurality of connecting holes arranged at equal angles in the negative pressure bin, the negative pressure bin is connected with the output end of the push-rotation air channel through the connecting holes, and the lower port of the conduit is connected with the positive pressure bin.

[0006] Preferably, the push-swirl airway is arranged in a vortex shape.

[0007] Preferably, the push diaphragm is in a bowl-shaped structure, the bowl mouth of the push diaphragm is arranged downward and the bowl mouth of the push diaphragm contacts and seals with the inner wall of the conduit; The tensioning spring has elastic force to drive the lifting column to move down and close to the rotating column. When the tensioning spring is in a free state, the top end of the sealing protrusion contacts the output end of the release port, and at this time, the upper end surface of the eccentric shifting plate is flush with the upper end surface of the supporting plate.

[0008] Preferably, the printing module includes a Z-axis linear module and an assembly frame, a Y-axis linear module is fixed on one side of the assembly frame, a scraper and a scraper are provided at the output end of the Y-axis linear module, a screen plate is detachably connected to the inner wall of the assembly frame, and two groups of symmetrically arranged C-shaped clamps are provided at the output end of the Z-axis linear module, and a clamping cylinder is provided on the top of the C-shaped clamp, which is used to clamp and fix the side of the assembly frame in the C-shaped clamp.

[0009] Preferably, the Z-axis linear module is also provided with a positive pressure joint matching with the positive pressure air pipe and a negative pressure joint matching with the negative pressure air pipe, the input end of the positive pressure joint is connected to the positive pressure device, and the input end of the negative pressure joint is connected to the negative pressure device, and both the positive pressure joint and the negative pressure joint are quick-release joints.

[0010] A post-printing inspection device for a printing system comprises a CCD camera arranged at the bottom of a C-shaped clamping plate, a guide hole is arranged on the side of the assembly frame, a guide column matched with the guide hole is arranged in the C-shaped clamping plate, the assembly frame is slidably connected in the C-shaped clamping plate through the guide hole and the guide column, and a weighing meter is also arranged at the bottom of the C-shaped clamping plate; The printing module also includes a control unit for processing CCD camera image information and weighing meter feedback data.

[0011] Preferably, the overall center of gravity of the Y-axis linear module, the scraper and the scraper plate is located on the same vertical line as the center of gravity of the assembly frame, and an equal amount of slurry is added into the assembly frame by a robot.

[0012] A post-printing detection method for a printing system comprises the following steps: S1. Assemble the corresponding screen plate on the assembly frame, and add an equal amount of slurry on the top of the screen plate through a manipulator; S2, the clamping cylinder releases the clamping of the assembly frame, so that the assembly frame is freely placed on the weighing scale. At this time, the control unit records the total mass of the assembly frame, Y-axis linear module, scraper, scraper, screen plate and slurry, and the total mass is recorded as G; S3, start the printing module and the circulating feed box, provide the printed circuit board to the bottom of the screen plate, and repeat the printing action. The CCD camera records the printed photo and the printed quantity of the printed circuit board each time, and the printed quantity is recorded as M; S4. After the same batch of printing is completed, the clamping cylinder releases the clamping of the assembly frame again, and the control unit records the total mass of the assembly frame, Y-axis linear module, scraper, scraper, screen plate and slurry, and the total mass is recorded as g; S5. On the premise that the CCD camera determines that the quality of the printed graphics of the same batch is qualified, the control unit can calculate whether the printing thickness is qualified by calculating the actual mass A of the printing paste on the single printed circuit board and comparing it with the theoretical mass a, where the calculation formula of the actual mass A is: A=(Gg) / M.

[0013] Compared with the prior art, the advantages of this application are: The present invention can automatically fine-tune and lock the centering position of the printed circuit board when conveying the printed circuit board through the mutual cooperation between the lifting column with the eccentric paddle plate, the rotating column with the push-rotation airway and the supporting plate with the negative pressure hole. The lifting column is designed to extend when positive pressure is applied and retract when positive pressure is withdrawn, so that the effective contact area between the eccentric paddle plate and the printed circuit board to be clamped is guaranteed, especially for printed circuit boards with thin thickness, clamping deformation is not easy to occur. The eccentric paddle plate close to the side of the printed circuit board is used to perform the centering operation, which effectively improves the accuracy of the printing position of the printed circuit board during screen printing. After completing the centering operation, the lifting column retracts to avoid the influence of the height of the lifting column on the printing action of the printing module, thereby improving the printing quality. The reciprocating and alternating transportation of the lower supporting plate and the upper supporting plate effectively improves the loading and unloading efficiency of the printed circuit board, and further improves the printing efficiency. The present invention has market prospects and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 It is a structural schematic diagram of the upper support plate proposed in this application; Figure 3 It is a structural schematic diagram of the lower support plate proposed in this application; Figure 4 It is a schematic cross-sectional structure diagram of the circulating feed box proposed in this application; Figure 5 for Figure 4 A schematic diagram of the enlarged structure of the middle part A; Figure 6 It is a structural schematic diagram of the centering locking mechanism proposed in this application; Figure 7 This is a schematic diagram of the structure of the lifting column proposed in this application; Figure 8 It is a schematic diagram of the cross-sectional structure of the components of the centering locking mechanism proposed in this application; Fig. 9 It is a schematic diagram of the cross-sectional structure of the push-swirl airway proposed in this application; Fig.10 It is a schematic cross-sectional structure diagram of the centering locking mechanism proposed in this application; Fig.11 It is a schematic diagram of the internal structure of the circulating feed box proposed in this application; Fig.12 It is a structural schematic diagram of the Z-axis linear module and its components proposed in this application; Fig.13 It is a structural schematic diagram of the assembly frame and its components proposed in this application; Fig.14 This is a schematic diagram of the bottom structure of the C-shaped splint proposed in this application.

[0015] Description of the numbers in the figure: Rack 1; Printing module 2, positive pressure connector 201, negative pressure connector 202, Z-axis linear module 21, Y-axis linear module 22, scraper 221, scraper plate 222, assembly frame 23, guide hole 231, C-type clamping plate 24, clamping cylinder 241, guide column 242, weighing meter 25, CCD camera 26; The supporting plate 3, the lower supporting plate 301, the upper supporting plate 302, the positive pressure air pipe 31, the negative pressure air pipe 32, the negative pressure hole 33, the first slider 34, the support seat 35, the second slider 351, the height guide rail 352, the slide seat 36, the guide wheel 37, the negative pressure bin 38, and the positive pressure bin 39; Circulating feeding box 4, guide plate 42, transmission belt 43, upper slide rail 44, lower slide rail 45, reciprocating motor 46; Centering locking mechanism 5, lifting column 51, eccentric plate 511, air guide tube 512, steering bin 513, release port 514, rotating column 52, push-swirl air channel 521, sealing convex edge 522, push diaphragm 53, conduit 54, connecting hole 541, tensioning spring 56; Printed circuit board 6; Silk screen plate7. DETAILED DESCRIPTION

[0016] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present application.

[0017] Embodiment 1: The present invention provides a printing system, see Figure 1 - Fig.14 , comprising a frame 1 and a printing module 2, the printing module 2 prints slurry on the surface of a printed circuit board 6 by screen printing technology, the frame 1 is also provided with a circulating feed box 4, the circulating feed box 4 is provided with a supporting plate 3, the supporting plate 3 comprises a lower supporting plate 301 and an upper supporting plate 302, the supporting plate 3 is provided with a plurality of negative pressure holes 33 arranged in an equidistant array and a plurality of centering locking mechanisms 5 arranged in an equidistant array, the centering locking mechanism 5 is used to align the center of the printed circuit board 6 to be printed with the printing center of the printing module 2; The support plate 3 is provided with a negative pressure bin 38 and a positive pressure bin 39 through a partition. A positive pressure air pipe 31 and a negative pressure air pipe 32 are provided on one side of the support plate 3. The positive pressure air pipe 31 is connected to the positive pressure bin 39, and the negative pressure air pipe 32 is connected to the negative pressure bin 38. The negative pressure bin 38 provides negative pressure for the negative pressure hole 33, and the positive pressure bin 39 provides positive pressure for the centering locking mechanism 5. The circulating feed box 4 is used to transport the lower pallet 301 to reciprocate in the horizontal direction. The circulating feed box 4 is also used to transport the upper pallet 302 to perform superimposed reciprocating motions in the horizontal direction and the vertical direction. The circulating feed box 4 continuously and alternately provides the printed circuit board 6 to the bottom of the printing module 2 through the cooperation of the lower pallet 301 and the upper pallet 302. The printed circuit board 6 needs to be cleaned in advance and the surface must be kept flat.

[0018] For details, please refer to Figure 2 - Fig.11 , first sliders 34 are fixed on both sides of the upper support plate 302, and an upper slide rail 44 matching with the first slider 34 is provided on the top of the circulating feed box 4; Slide seats 36 are fixed on both sides of the lower support plate 301, and support seats 35 are provided at the bottom of the slide seats 36. A height guide rail 352 is fixed on the top of the support seat 35, and a slide groove matching the height guide rail 352 is provided on the slide seat 36. A second slider 351 is fixed on the bottom of the support seat 35, and a lower slide rail 45 matching the second slider 351 is provided at the bottom of the circulating feed box 4. A guide wheel 37 is also rotatably connected between the lower support plate 301 and the slide seat 36, and a lower slide rail 45 matching the guide wheel 37 is fixed at the bottom of the circulating feed box 4, and a U-shaped notch is provided on the top of the lower slide rail 45; The inner wall of the circulating feed box 4 is symmetrically connected to a transmission belt 43, which is driven by a reciprocating motor 46 to reciprocate. The upper support plate 302 is fixed to the top belt side of the transmission belt 43, and the support seat 35 on the lower support plate 301 is fixed to the bottom belt side of the first slider 34.

[0019] Since the circulating feeding box 4 drives the transmission belt 43 to reciprocate through the reciprocating motor 46, the upper and lower belts of the transmission belt 43 have different transmission directions, so that the lower support plate 301 and the upper support plate 302 can reciprocate in opposite directions in the horizontal direction, wherein the upper support plate 302 utilizes the cooperation of the first slider 34 and the upper slide rail 44 to achieve running stability; When the lower pallet 301 and the upper pallet 302 meet in the middle of the transmission belt 43, the lower pallet 301 uses the guiding effect of the guide wheel 37 and the guide plate 42 to move the lower pallet 301 downward along the height guide rail 352, maintaining the upper and lower pallet 301 Staggered state, the alternating operation of the lower pallet 301 and the upper pallet 302 can effectively improve the loading and unloading efficiency of the circulating feed box 4.

[0020] See also Figure 4 - Fig.10 Specifically, the centering locking mechanism 5 includes a conduit 54 inserted into the negative pressure chamber 38 and the positive pressure chamber 39, the top inner wall of the conduit 54 is rotatably connected to a rotating column 52, and the top of the rotating column 52 is limitedly slidably connected to a lifting column 51 through a spline groove structure; An eccentric plate 511 is fixed to the top of the lifting column 51, an air guide tube 512 is fixed to the bottom of the lifting column 51, a steering bin 513 is arranged inside the lifting column 51, the top of the air guide tube 512 extends into the steering bin 513, the bottom of the air guide tube 512 extends through the rotating column 52 and is rotatably connected to a push diaphragm 53, and a tension spring 56 is arranged between the push diaphragm 53 and the rotating column 52; A plurality of release ports 514 are provided at the bottom of the steering bin 513, a sealing ridge 522 matching the release ports 514 is provided in the rotating column 52, a plurality of push-swirl air passages 521 arranged at equal angles are provided at the bottom of the rotating column 52, the push-swirl air passages 521 are arranged in a vortex shape, and a plurality of connecting holes 541 arranged at equal angles are provided in the conduit 54 in the negative pressure bin 38, the negative pressure bin 38 is connected to the output end of the push-swirl air passage 521 through the connecting holes 541, and the lower end of the conduit 54 is connected to the positive pressure bin 39.

[0021] In the present application, a manipulator performs loading and unloading operations at one end of the circulating feed box 4 away from the printing module 2. When the manipulator places the printed circuit board 6 on the lower support plate 301 or the upper support plate 302, the approximate printing orientation and position of the printed circuit board 6 are maintained. When the support plate 3 conveys the printed circuit board 6 to the bottom of the printing module 2, a first-level negative pressure is first provided in the negative pressure chamber 38, and the negative pressure is transmitted to the bottom of the printed circuit board 6 through the negative pressure hole 33, so that the printed circuit board 6 is initially fixed and the centering locking mechanism 5 at the bottom of the printed circuit board 6 is pressed. At this time, positive pressure is provided in the positive pressure chamber 39, and the positive pressure enters the steering chamber 513 through the push diaphragm 53 and the air guide tube 512. Since the lifting column 51 at the bottom of the printed circuit board 6 cannot move upward due to the pressure of the printed circuit board 6, the printed circuit board 6 will not be lifted. The lifting column 51 on the side of the printed circuit board 6 is affected by the thrust of the positive pressure on the push diaphragm 53 and the steering bin 513, and the lifting column 51 overcomes the elastic force of the tensioning spring 56 and moves upward. At this time, the sealing convex edge 522 no longer blocks the release port 514, and the positive pressure is transmitted to the push-swirl airway 521 through the release port 514. Since the push-swirl airway 521 is arranged in a vortex shape, it is driven by the positive pressure to push the rotating column 52 to rotate. Since the lifting column 51 is slidably connected to the rotating column 52 through the spline structure, the rotation of the rotating column 52 also drives the lifting column 51 The eccentric plates 511 on the sides of the printed circuit board 6 rotate and contact the sides of the printed circuit board 6. Since the positive pressure values ​​of the centering locking mechanism 5 on the opposite sides of the printed circuit board 6 in the positive pressure chamber 39 are equal, that is, the contact forces of the eccentric plates 511 on the opposite sides of the printed circuit board 6 on the sides of the printed circuit board 6 are equal, the rotation angles of the eccentric plates 511 on both sides of the printed circuit board 6 are kept equal, and the printed circuit board 6 can be finely adjusted forward, backward, left, and right to the center position, and the correct printing position of the printed circuit board 6 is maintained; At this time, a secondary negative pressure is provided in the negative pressure chamber 38 , so that the printed circuit board 6 is completely adsorbed on the upper surface of the supporting plate 3 , thereby achieving complete fixation of the position of the printed circuit board 6 .

[0022] See also Figure 5 - Figure 8 In order to enhance the lifting force of the positive pressure in the positive pressure chamber 39 on the lifting column 51, the push diaphragm 53 is in a bowl-shaped structure, the bowl mouth of the push diaphragm 53 is arranged downward and the bowl mouth of the push diaphragm 53 contacts and seals with the inner wall of the conduit 54; Furthermore, the tensioning spring 56 has an elastic force that drives the lifting column 51 to move downward close to the rotating column 52. When the tensioning spring 56 is in a free state, the top end of the sealing protrusion 522 abuts against the output end of the release port 514, and at this time, the upper end surface of the eccentric shift plate 511 is flush with the upper end surface of the supporting plate 3.

[0023] When the printing position of the printed circuit board 6 is completely fixed, the positive pressure in the positive pressure chamber 39 is removed and the secondary negative pressure in the negative pressure chamber 38 is maintained. At this time, the lifting column 51 in the centering locking mechanism 5 is affected by the elastic force of the tensioning spring 56 and is completely retracted into the guide tube 54, so as to prevent the slurry from adhering to the upper surface of the protruding eccentric plate 511 during the printing process, thereby reducing the loss of slurry and meeting the clamping and centering requirements of printed circuit boards 6 of different thicknesses.

[0024] See also Fig.12 - Fig.14The printing module 2 includes a Z-axis linear module 21 and an assembly frame 23. A Y-axis linear module 22 is fixed on one side of the assembly frame 23. A scraper 221 and a scraper 222 are provided at the output end of the Y-axis linear module 22. A screen plate 7 is detachably connected to the inner wall of the assembly frame 23. It should be noted that the screen plate 7 is made of metal wire or polymer fiber and is processed into a specific pattern and size according to the requirements of circuit board printing design. The structural design of the screen plate 7 being detachably connected to the assembly frame 23 can meet the printing requirements of different circuit boards, and the adaptability is effectively improved. Two groups of symmetrically arranged C-type clamps 24 are provided at the output end of the Z-axis linear module 21. A clamping cylinder 241 is provided on the top of the C-type clamp 24. The clamping cylinder 241 is used to clamp and fix the side of the assembly frame 23 in the C-type clamp 24.

[0025] The Z-axis linear module 21 is also provided with a positive pressure connector 201 that cooperates with the positive pressure air pipe 31, and a negative pressure connector 202 that cooperates with the negative pressure air pipe 32. The input end of the positive pressure connector 201 is connected to the positive pressure device, and the input end of the negative pressure connector 202 is connected to the negative pressure device. Both the positive pressure connector 201 and the negative pressure connector 202 are quick-release connectors. Furthermore, in order to meet the requirement that the negative pressure chamber 38 supplies negative pressure first and the positive pressure chamber 39 supplies positive pressure later, the length of the negative pressure connector 202 is greater than the length of the positive pressure connector 201.

[0026] Since the present invention adopts the method of connecting the negative pressure joint 202 with the negative pressure air pipe 32 to provide negative pressure, compared with the traditional negative pressure clamp, there is no need to continuously supply pressure during the feeding process of the support plate 3, thus avoiding complex pipeline design and reducing the operating energy consumption and cost of the negative pressure equipment.

[0027] During the actual printing process, the Z-axis linear module 21 drives the C-shaped clamp 24 to move up and down in height, thereby adjusting the distance between the screen plate 7 and the upper surface of the circuit board to be printed, and the Y-axis linear module 22 drives the scraper 221 and the scraper 222 to move synchronously, wherein the scraper 222 spreads the slurry evenly on the upper surface of the screen plate 7, and the scraper 221 squeezes the slurry through the screen plate 7 and prints it on the upper surface of the circuit board.

[0028] More specifically, the slurry is a conductive slurry, an insulating slurry or a hardener. It should be noted that since the slurry contains volatile organic compounds, the negative pressure chamber 38 provides negative pressure to the negative pressure hole 33, which can absorb harmful gases at the work station, reduce the concentration of harmful gases in the working environment, and protect the health of the operator.

[0029] The present invention cooperates with the lifting column 51 with the eccentric dial plate 511, the rotating column 52 with the push-rotation airway 521, and the supporting plate 3 with the negative pressure hole 33. When conveying the printed circuit board 6, the centering position of the printed circuit board 6 can be automatically fine-tuned and locked. The lifting column 51 is designed to extend when applying positive pressure and retract when withdrawing positive pressure, so as to ensure the effective contact area between the eccentric dial plate 511 and the printed circuit board 6 to be clamped. In particular, for the printed circuit board 6 with a thinner thickness, it is not easy to produce clamping deformation. The eccentric dial plate 511 close to the side of the printed circuit board 6 is used to perform the centering operation, which effectively improves the accuracy of the printing position of the printed circuit board 6 during the screen printing process. After completing the centering operation, the lifting column 51 retracts to avoid the influence of the height of the lifting column 51 on the printing action of the printing module 2, thereby improving the printing quality. The reciprocating and alternating transportation of the lower supporting plate 301 and the upper supporting plate 302 effectively improves the loading and unloading efficiency of the printed circuit board 6, further improves the printing efficiency, has market prospects, and is suitable for promotion and application.

[0030] Embodiment 2: The present invention provides a post-printing detection device for a printing system, see Figure 1 - Fig.14 , wherein the components identical or corresponding to those in Embodiment 1 are marked with the corresponding reference numerals in Embodiment 1. For the sake of simplicity, only the differences from Embodiment 1 are described below: A post-printing detection device for a printing system, comprising a CCD camera 26 arranged at the bottom of a C-shaped clamping plate 24, a guide hole 231 is arranged on the side of an assembly frame 23, a guide column 242 matched with the guide hole 231 is arranged in the C-shaped clamping plate 24, the assembly frame 23 is slidably connected in the C-shaped clamping plate 24 through the guide hole 231 and the guide column 242, and a weighing meter 25 is also arranged at the bottom of the C-shaped clamping plate 24; The printing module 2 also includes a control unit for processing image information from the CCD camera 26 and feedback data from the weighing meter 25. The overall center of gravity of the Y-axis linear module 22, the scraper 221 and the scraper plate 222 is located on the same vertical line as the center of gravity of the assembly frame 23. An equal amount of slurry is added to the assembly frame 23 by a robot.

[0031] In this embodiment, the visual detection system of the CCD camera 26 and the weight detection system of the weighing meter 25 can monitor the integrity of the printed graphics and the printing thickness of the printing paste at the same time. By timely detecting the printing thickness of the circuit board and the integrity of the printed graphics, problems can be discovered and adjusted to avoid quality problems in subsequent production links and improve production efficiency.

[0032] Embodiment 3: The present invention provides a post-printing detection method for a printing system, see Figure 1 - Fig.14, wherein the components identical or corresponding to those in Embodiment 2 are marked with the corresponding reference numerals in Embodiment 2. For the sake of simplicity, only the differences from Embodiment 2 are described below: A post-printing detection method for a printing system comprises the following steps: S1, assembling the corresponding screen plate 7 on the assembly frame 23, and adding an equal amount of slurry on the top of the screen plate 7 by a manipulator; S2, the clamping cylinder 241 releases the clamping of the assembly frame 23, so that the assembly frame 23 is freely placed on the weighing scale 25, and the control unit records the total mass of the assembly frame 23, the Y-axis linear module 22, the scraper 221, the scraper 222, the screen plate 7 and the slurry, and the total mass is recorded as G; S3, start the printing module 2 and the circulating feed box 4, provide the printed circuit board 6 to the bottom of the screen plate 7, and repeat the printing action. Each time printing, the CCD camera 26 records the printed photo and the printed quantity of the printed circuit board 6, and the printed quantity is recorded as M; S4, after the same batch of printing is completed, the clamping cylinder 241 releases the clamping of the assembly frame 23 again, and the control unit records the total mass of the assembly frame 23, the Y-axis linear module 22, the scraper 221, the scraper 222, the screen plate 7 and the slurry, and the total mass is recorded as g; S5. On the premise that the CCD camera 26 determines that the quality of the printed graphics of the same batch is qualified, the control unit calculates the actual mass A of the printing paste on the single printed circuit board 6 and compares it with the theoretical mass a to calculate whether the printing thickness is qualified, wherein the calculation formula of the actual mass A is: A=(Gg) / M.

[0033] The above is only the best implementation method adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. A printing system, comprising a frame (1) and a printing module (2), characterized in that: The frame (1) is also provided with a circulating material supply box (4), the circulating material supply box (4) is provided with a supporting plate (3), the supporting plate (3) comprises a lower supporting plate (301) and an upper supporting plate (302), and the supporting plate (3) is provided with a plurality of negative pressure holes (33) arranged in an equidistant array and a plurality of centering locking mechanisms (5) arranged in an equidistant array; The support plate (3) is provided with a negative pressure chamber (38) and a positive pressure chamber (39) through a partition. A positive pressure air pipe (31) and a negative pressure air pipe (32) are also provided on one side of the support plate (3). The positive pressure air pipe (31) is connected to the positive pressure chamber (39), and the negative pressure air pipe (32) is connected to the negative pressure chamber (38). The negative pressure chamber (38) provides negative pressure for the negative pressure hole (33), and the positive pressure chamber (39) provides positive pressure for the centering locking mechanism (5). The circulating material supply box (4) is used to convey the lower pallet (301) to perform horizontal reciprocating motion, and the circulating material supply box (4) is also used to convey the upper pallet (302) to perform horizontal reciprocating motion and vertical reciprocating motion in a superimposed manner.

2. A printing system according to claim 1, characterized in that: First slide blocks (34) are fixed on both sides of the upper support plate (302), and an upper slide rail (44) matching with the first slide block (34) is provided on the top of the circulating feed box (4); Slide seats (36) are fixed on both sides of the lower support plate (301), and support seats (35) are provided at the bottom of the slide seats (36). A height guide rail (352) is fixed on the top of the support seat (35), and a slide groove matching the height guide rail (352) is provided on the slide seat (36). A second slider (351) is fixed on the bottom of the support seat (35), and a lower slide rail (45) matching the second slider (351) is provided at the bottom of the circulating feed box (4). A guide wheel (37) is also rotatably connected between the lower support plate (301) and the slide seat (36), and a lower slide rail (45) matching the guide wheel (37) is fixed at the bottom of the circulating feed box (4), and a U-shaped notch is provided on the top of the lower slide rail (45); The inner wall of the circulating feed box (4) is symmetrically rotatably connected to a transmission belt (43), and the transmission belt (43) is driven by a reciprocating motor (46) to reciprocate. The upper support plate (302) is fixed to the top belt side of the transmission belt (43), and the support seat (35) on the lower support plate (301) is fixed to the bottom belt side of the first slider (34).

3. A printing system according to claim 2, characterized in that: The centering locking mechanism (5) comprises a conduit (54) inserted into the negative pressure chamber (38) and the positive pressure chamber (39); the inner wall of the top of the conduit (54) is rotatably connected to a rotating column (52); the top of the rotating column (52) is limitedly slidably connected to a lifting column (51) via a spline groove structure; An eccentric shift plate (511) is fixed to the top of the lifting column (51), an air guide tube (512) is fixed to the bottom of the lifting column (51), a steering bin (513) is provided in the lifting column (51), the top end of the air guide tube (512) extends into the steering bin (513), the bottom end of the air guide tube (512) extends through the rotating column (52) and is rotatably connected to a push diaphragm (53), and a tension spring (56) is provided between the push diaphragm (53) and the rotating column (52); The bottom of the steering bin (513) is provided with a plurality of release ports (514); a sealing convex edge (522) matching the release ports (514) is provided inside the rotating column (52); the bottom of the rotating column (52) is also provided with a plurality of push-swirl air passages (521) arranged at equal angles; the conduit (54) is also provided with a plurality of connecting holes (541) arranged at equal angles inside the negative pressure bin (38); the negative pressure bin (38) is connected to the output end of the push-swirl air passage (521) through the connecting holes (541); and the lower end of the conduit (54) is connected to the positive pressure bin (39).

4. A printing system according to claim 3, characterized in that: The push-swirl air channel (521) is arranged in a vortex shape.

5. A printing system according to claim 4, characterized in that: The push diaphragm (53) is in a bowl-shaped structure, the bowl mouth of the push diaphragm (53) is arranged downward, and the bowl mouth of the push diaphragm (53) contacts and seals against the inner wall of the conduit (54); The tensioning spring (56) has an elastic force that drives the lifting column (51) to move downward and closer to the rotating column (52). When the tensioning spring (56) is in a free state, the top end of the sealing convex edge (522) contacts the output end of the release port (514), and at this time, the upper end surface of the eccentric shifting plate (511) is flush with the upper end surface of the supporting plate (3).

6. A printing system according to claim 5, characterized in that: The printing module (2) comprises a Z-axis linear module (21) and an assembly frame (23); a Y-axis linear module (22) is fixed on one side of the assembly frame (23); a scraper (221) and a scraper plate (222) are provided at the output end of the Y-axis linear module (22); a screen plate (7) is detachably connected to the inner wall of the assembly frame (23); two groups of symmetrically arranged C-shaped clamps (24) are provided at the output end of the Z-axis linear module (21); a clamping cylinder (241) is provided on the top of each of the C-shaped clamps (24); and the clamping cylinder (241) is used to clamp and fix the side of the assembly frame (23) in the C-shaped clamp (24).

7. A printing system according to claim 6, characterized in that: The Z-axis linear module (21) is also provided with a positive pressure joint (201) matched with the positive pressure air pipe (31), and a negative pressure joint (202) matched with the negative pressure air pipe (32); the input end of the positive pressure joint (201) is connected to the positive pressure device, and the input end of the negative pressure joint (202) is connected to the negative pressure device; both the positive pressure joint (201) and the negative pressure joint (202) are quick-release joints.

8. A post-printing detection device for a printing system, applied to a printing system according to claim 7, comprising a CCD camera (26) arranged at the bottom of a C-shaped clamping plate (24), characterized in that: A guide hole (231) is provided on the side of the assembly frame (23), a guide column (242) matching the guide hole (231) is provided in the C-shaped clamping plate (24), the assembly frame (23) is slidably connected in the C-shaped clamping plate (24) through the guide hole (231) and the guide column (242), and a weighing scale (25) is also provided at the bottom of the C-shaped clamping plate (24); The printing module (2) also includes a control unit for processing image information from the CCD camera (26) and feedback data from the weighing meter (25).

9. The post-printing detection device of a printing system according to claim 8, characterized in that: The overall center of gravity of the Y-axis linear module (22), the scraper (221) and the scraper plate (222) is located on the same vertical line as the center of gravity of the assembly frame (23), and an equal amount of slurry is added into the assembly frame (23) by a robot.

10. A post-printing detection method for a printing system, applied to a post-printing detection device for a printing system according to claim 9, characterized in that: The specific steps include: S1, assembling the corresponding screen plate (7) on the assembly frame (23), and adding an equal amount of slurry on the top of the screen plate (7) by a robot; S2, the clamping cylinder (241) releases the clamping of the assembly frame (23), so that the assembly frame (23) is freely placed on the weighing scale (25), and the control unit records the total mass of the assembly frame (23), the Y-axis linear module (22), the scraper (221), the scraper (222), the screen plate (7) and the slurry, and the total mass is recorded as G; S3, starting the printing module (2) and the circulating supply box (4), providing the printed circuit board (6) to the bottom of the screen plate (7), and performing repeated printing actions, wherein the CCD camera (26) records the printed photo and the printed quantity of the printed circuit board (6) each time printing, and the printed quantity is recorded as M; S4. After the same batch of printing is completed, the clamping cylinder (241) releases the clamping of the assembly frame (23) again, and the control unit records the total mass of the assembly frame (23), the Y-axis linear module (22), the scraper (221), the scraper (222), the screen plate (7) and the slurry, and the total mass is recorded as g; S5. On the premise that the CCD camera (26) determines that the quality of the printed graphics of the same batch is qualified, the control unit calculates the actual mass A of the printed slurry on the single printed circuit board (6) and compares it with the theoretical mass a to calculate whether the printing thickness is qualified, wherein the calculation formula of the actual mass A is: A=(Gg) / M.

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