A screen printing device

Abstract

This utility model provides a screen printing device, including a base and a material tray horizontally rotatably connected to the top of the base. The top of the material tray has several positioning stations for fixing workpieces. A rotating mechanism is provided on the base to drive the material tray to rotate. A printing frame is located above the base, and a reciprocating frame is horizontally reciprocating on the printing frame. A driving mechanism is provided on the printing frame to drive the reciprocating frame to reciprocate. A first lifting cylinder and a second lifting cylinder are both vertically mounted on the reciprocating frame. A squeegee is horizontally mounted at the bottom of the piston rod of the first lifting cylinder, and a return ink plate is horizontally mounted at the bottom of the piston rod of the second lifting cylinder. The printing screen frame is rectangular, and a printing screen body is located inside the printing screen frame. The squeegee and return ink plate are both located above the printing screen body, and any positioning station can be moved to below the printing screen body. This screen printing device provides improved efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of screen printing technology and relates to a screen printing device. Background Technology

[0002] Screen printing refers to the process of creating a screen printing plate with images and text using a photosensitive method. Screen printing consists of five main elements: the screen printing plate, the squeegee, the ink, the printing table, and the substrate. It utilizes the basic principle that ink can pass through the mesh openings of the screen printing plate in the image areas, while ink cannot pass through the openings in the non-image areas. During printing, ink is poured into one end of the screen printing plate, and a squeegee applies pressure to the ink areas while moving at a constant speed towards the other end. As the squeegee moves, the ink is forced through the mesh openings in the image areas onto the substrate.

[0003] Currently, a Chinese patent with publication number CN222431842 U discloses a screen printing machine that can easily load and unload the screen frame. However, in the actual printing process, after the object under the screen printing plate is printed, the machine needs to be stopped to remove the object and place a new one, which results in low efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a screen printing device that aims to solve the problem of low printing efficiency.

[0005] To solve the above-mentioned technical problems, this utility model provides a screen printing device, comprising:

[0006] The base and a material tray horizontally rotatably connected to the top of the base are provided. The top of the material tray is provided with several positioning stations for fixing workpieces. The base is provided with a rotating mechanism for driving the material tray to rotate.

[0007] A printing rack is located above the base. A reciprocating frame is horizontally and reciprocatingly mounted on the printing rack. A drive mechanism for driving the reciprocating frame to perform reciprocating movements is provided on the printing rack.

[0008] The first lifting cylinder and the second lifting cylinder are both vertically arranged on the reciprocating frame. The bottom of the piston rod of the first lifting cylinder is horizontally provided with a scraper plate, and the bottom of the piston rod of the second lifting cylinder is horizontally provided with a return ink plate.

[0009] A printing frame, which is rectangular, has a printing screen body on its inner side. The squeegee and the return ink plate are both located above the printing screen body, and any of the positioning stations can be moved to the bottom of the printing screen body.

[0010] The present invention is further configured such that both ends of the ink return plate are provided with ink return portions at an angle, the bottom of the ink return portion is at the same height as the bottom of the ink return plate, and the two ink return portions and the ink return plate form a C-shape with the opening facing the scraper plate.

[0011] The present invention is further configured such that two third lifting cylinders are vertically arranged on the printing frame, and the bottom of the piston rod of each of the third lifting cylinders is horizontally provided with a limiting plate. The squeegee is located between the limiting plate and the ink return plate, and the trajectories of the two ends of the squeegee overlap with the trajectories of the two limiting plates respectively. The limiting plate is used to guide the ink outside the two ends of the squeegee toward the squeegee.

[0012] The present invention is further configured such that a drive port is provided vertically through the middle of the printing frame, the reciprocating frame is movably fastened to the outer wall of the printing frame, and a linkage part is provided in the middle of the reciprocating frame. The linkage part is movably fitted to the inner wall of the drive port. The drive mechanism includes a drive screw horizontally rotatably connected to both ends of the printing frame and a motor for driving the drive screw to rotate. The drive screw passes through the linkage part and is threadedly engaged with the linkage part.

[0013] The present invention is further configured such that the rotating mechanism includes a bottom column fixedly disposed on the top of the base and a top column rotatably connected to the top of the bottom column, the base is provided with a motor for driving the top column to rotate, and the material tray is fixedly connected to the top column.

[0014] Each of the positioning stations has a positioning groove at its top that matches the shape of the workpiece.

[0015] The present invention is further configured such that the bottom column is an upward-opening cover, the top column is an downward-opening cover, the top of the top column is rotatably connected to the bottom of the bottom column, the bottom of the bottom column is connected to a negative pressure pipe, and the cavity formed by the top column and the bottom column is continuously under negative pressure. The material tray has several negative pressure channels, one end of each negative pressure channel is connected to the inner cavity of the top column, and the other end passes through the top of the positioning station and is connected to the outside. Each negative pressure channel is provided with a solenoid valve for controlling the opening and closing of the negative pressure channel.

[0016] The present invention is further configured such that an auxiliary cylinder is vertically arranged on the top of the base, and an auxiliary part is arranged on the top of the piston rod of the auxiliary cylinder, the auxiliary part being located below the material tray;

[0017] The base has a top frame on top, the printing frame is located on the top frame, and a support plate is horizontally mounted on the top frame. A through-hole is opened in the middle of the support plate, and the printing screen is located below the through-hole. Two parallel lower edge frames are horizontally mounted at the bottom of the support plate, located on either side of the through-hole. Telescopic rails are horizontally mounted on the opposite sides of the two lower edge frames. The longitudinal section of each telescopic rail is an inverted T-shape, dovetail shape, or inverted Ω-shape. A telescopic frame, rectangular in shape, is horizontally movable between the two telescopic rails and engages with them. A positioning pin is mounted on the top of the telescopic frame, and a positioning hole is provided on the printing screen frame to cooperate with the positioning pin. A synchronization part, lower than the lower edge frame, is horizontally mounted on the side of the telescopic frame. A telescopic cylinder for driving the synchronization part is horizontally mounted at the bottom of the support plate.

[0018] The present invention is further configured such that a top frame is provided on the top of the base, the printing frame is located on the top frame, a support plate is horizontally provided on the top frame, a through-hole is provided in the middle of the support plate, and the printing screen is located below the through-hole;

[0019] The bottom of the support plate is horizontally provided with parallel inlet / outlet cylinders and first rails. There are two inlet / outlet cylinders and two first rails on each side of the through-hole, and the first rail is located between the inlet / outlet cylinders and the through-hole.

[0020] The bottom of the first rail body is horizontally and movably fastened with an inlet / outlet post. A second rail body is horizontally arranged on the side of the inlet / outlet post near the through-hole. The longitudinal sections of the first rail body and the second rail body are T-shaped, dovetail-shaped, or Ω-shaped. A telescopic frame that movably engages with the second rail body is horizontally and movably arranged between the two second rail bodies. The telescopic frame is rectangular and has a positioning pin at its top. The printing screen frame has a positioning hole that mates with the positioning pin.

[0021] The inlet / outlet column is rotatably provided with a first wheel and a second wheel on the side near the inlet / outlet cylinder. A transmission belt is movably sleeved on the outer wall of the first wheel and the second wheel. A fixed seat is provided at the bottom of the support plate and fixedly connected to the top of the transmission belt. A transmission part is horizontally fixedly provided at the bottom of the transmission belt. The free end of the transmission part is fixedly connected to the telescopic frame. A linkage body is provided on the inlet / outlet column and fixedly connected to the piston rod of the inlet / outlet cylinder.

[0022] The present invention is further configured such that both sides of the printing screen frame are provided with positioning grooves having an inverted T-shaped longitudinal section, the inner end of the positioning grooves horizontally penetrating the printing screen frame, and a plurality of positioning cylinders are vertically arranged on the support plate. The bottom of the piston rod of each positioning cylinder is provided with a cylindrical lifting column, and the bottom of each lifting column is provided with a disc-shaped lifting plate. The lifting column is movably located within the positioning groove, the top of the lifting plate abuts against the inner wall of the positioning groove, and the top of the printing screen frame is attached to the bottom of the support plate. Each positioning groove has at least two lifting plates.

[0023] The present invention is further configured such that a horizontal plate is horizontally arranged at the bottom of the piston rod of the first lifting cylinder, and vertical plates are vertically arranged at the bottom of both sides of the horizontal plate. A swing shaft is horizontally rotatably arranged between the two vertical plates. A swing seat is fixedly arranged on the swing shaft. A first adapting seat is arranged at the bottom of the swing seat. The first adapting seat and the swing seat form an inverted T-shape. Force sensors are arranged at the bottom of both ends of the first adapting seat. A second adapting seat parallel to the first adapting seat is arranged at the bottom of the two force sensors. The doctor blade is made of flexible material and is connected to the bottom of the second adapting seat. A stabilizing rod perpendicular to the second adapting seat is arranged at the top of the second adapting seat. The stabilizing rod moves through the first adapting seat, and the outer wall of the stabilizing rod is attached to the first adapting seat.

[0024] A fixing mechanism for fixing the angle of the swing axis is provided on the vertical plate, the fixing mechanism comprising:

[0025] Electromagnetic brake, or

[0026] A fixed base is fixedly disposed on the outer side of the vertical plate, and a fixing screw is threadedly connected to the fixed base, the end of which abuts against the outer wall of the swing shaft.

[0027] Compared with existing technologies, this utility model provides a screen printing device. When printing on a workpiece (such as glass), the workpiece is first placed (either manually by a worker or automatically by a robotic arm) at a positioning station outside the printing screen. Then, the material tray is driven by a rotating mechanism to rotate, causing the positioning station with the workpiece to rotate below the printing screen (there is a height difference between the workpiece and the printing screen at this point). Next, a first lifting cylinder lowers the height of the squeegee, causing it to act downwards on the top of the printing screen and press the screen against the top of the workpiece. Then, a drive mechanism drives a reciprocating frame to move along the length of the printing frame. During this process, the ink upstream of the squeegee is agitated and partially passes through the printing screen (with small holes bearing the desired pattern) and acts on the surface of the workpiece.

[0028] When the squeegee reaches its maximum stroke, the first lifting cylinder raises the squeegee, causing the printing screen to rise naturally. At this point, the second lifting cylinder drives the return ink plate downwards, ensuring its bottom is against the top of the printing screen (at this point, the printing screen is higher than the workpiece). The reciprocating frame then moves back, using the return ink plate to move excess ink to a standby position for the next squeegee cycle. Simultaneously, the material tray rotates, transferring the next workpiece below the printing screen, ready for the next printing cycle. Printed workpieces can be removed after rotating to the outside of the printing frame (either manually by a worker or using a robotic arm, suction cup, etc.). This multi-positioning material tray system dynamically manages loading, unloading, and printing, improving printing and production efficiency. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention. Figure 1 ;

[0030] Figure 2 yes Figure 1 Enlarged view of section A;

[0031] Figure 3 yes Figure 1 Enlarged view of section B;

[0032] Figure 4 yes Figure 3 Enlarged view of section B1;

[0033] Figure 5 yes Figure 1 Enlarged view of section C;

[0034] Figure 6 yes Figure 1 Enlarged view of section D;

[0035] Figure 7 yes Figure 6 Enlarged view of section D1;

[0036] Figure 8 yes Figure 1 Enlarged view of section E in the middle;

[0037] Figure 9 This is a structural schematic diagram of Embodiment 1 of the present invention. Figure 2 ;

[0038] Figure 10 This is a schematic diagram of the support plate and printing frame in Embodiment 1 of this utility model;

[0039] Figure 11 yes Figure 10 Enlarged view of section F in the middle;

[0040] Figure 12 This is a schematic diagram of the first and second adapting seats in Embodiment 1 of this utility model;

[0041] Figure 13 yes Figure 12 Enlarged view of section G in the middle;

[0042] Figure 14 This is a schematic diagram of the inlet / outlet column portion in Embodiment 2 of this utility model. Figure 1 ;

[0043] Figure 15 This is a schematic diagram of the inlet / outlet column portion in Embodiment 2 of this utility model. Figure 2 .

[0044] The components include: 1. Base; 2. Material tray; 3. Positioning station; 4. Printing rack; 5. Reciprocating rack; 6. First lifting cylinder; 7. Second lifting cylinder; 8. Squeegee; 9. Ink return plate; 10. Printing frame; 11. Printing screen body; 12. Ink return section; 13. Third lifting cylinder; 14. Limiting plate; 15. Drive port; 16. Bottom column; 17. Top column; 18. Positioning groove; 19. Auxiliary cylinder body; 20. Auxiliary section; 21. Top frame; 22. Support plate; 23. Through-hole; 24. Lower edge frame; 25. Telescopic rail; 26. Extension... 27. Retractable frame; 28. Positioning hole; 29. ​​Synchronization part; 30. Telescopic cylinder; 31. Positioning pin; 32. Positioning cylinder; 33. Lifting column; 34. Lifting plate; 35. Inlet / outlet cylinder body; 36. Inlet / outlet column; 37. First wheel body; 38. Second wheel body; 39. Transmission belt; 40. Fixed seat; 41. Transmission part; 42. Linkage body; 43. Horizontal plate; 44. Vertical plate; 45. Swing shaft; 46. Swing seat; 47. First adapting seat; 48. Force sensor; 49. Second adapting seat; 50. Stabilizer; 51. Electromagnetic brake. Detailed Implementation

[0045] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the screen printing equipment proposed in this utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model. The same or similar reference numerals in the drawings represent the same or similar parts.

[0046] Example 1

[0047] A screen printing device, such as Figures 1 to 13 As shown, it includes:

[0048] The base 1 and the material tray 2 are horizontally rotatably connected to the top of the base 1. The top of the material tray 2 is provided with a number of positioning stations 3 for fixing workpieces. The base 1 is provided with a rotating mechanism for driving the material tray 2 to rotate.

[0049] Printing frame 4, located above the base 1, with a reciprocating frame 5 horizontally reciprocatingly mounted on the printing frame 4, and a drive mechanism for driving the reciprocating frame 5 to reciprocate.

[0050] The first lifting cylinder 6 and the second lifting cylinder 7 are both vertically arranged on the reciprocating frame 5. The bottom of the piston rod of the first lifting cylinder 6 is horizontally provided with a scraper 8, and the bottom of the piston rod of the second lifting cylinder 7 is horizontally provided with a return ink plate 9.

[0051] The printing frame 10 is rectangular, and a printing screen body 11 is provided on the inner side of the printing frame 10. The squeegee 8 and the ink return plate 9 are both located above the printing screen body 11, and any of the positioning stations 3 can be moved to the bottom of the printing screen body 11.

[0052] Both ends of the ink return plate 9 are provided with ink return parts 12 at an angle. The bottom of the ink return part 12 is at the same height as the bottom of the ink return plate 9, and the two ink return parts 12 and the ink return plate 9 form a C-shape with the opening facing the scraper plate 8.

[0053] The printing frame 4 is also vertically equipped with two third lifting cylinders 13. The bottom of the piston rod of each third lifting cylinder 13 is horizontally equipped with a limiting plate 14. The squeegee 8 is located between the limiting plate 14 and the ink return plate 9, and the trajectory of both ends of the squeegee 8 coincides with the trajectory of the two limiting plates 14 respectively. The limiting plate 14 is used to guide the ink outside the two ends of the squeegee 8 toward the squeegee 8.

[0054] A drive port 15 is provided vertically through the middle of the printing frame 4. The reciprocating frame 5 is movably fastened to the outer wall of the printing frame 4, and a linkage part is provided in the middle of the reciprocating frame 5. The linkage part is movably attached to the inner wall of the drive port 15. The drive mechanism includes a drive screw that is horizontally rotatably connected to both ends of the printing frame 4 and a motor for driving the drive screw to rotate. The drive screw passes through the linkage part and is threadedly engaged with the linkage part.

[0055] The rotating mechanism includes a bottom column 16 fixedly disposed on the top of the base 1 and a top column 17 rotatably connected to the top of the bottom column 16. The base 1 is provided with a motor for driving the top column 17 to rotate, and the material tray 2 is fixedly connected to the top column 17.

[0056] Each positioning station 3 has a positioning groove 18 at its top that matches the shape of the workpiece. The bottom column 16 is an upward-opening cover, and the top column 17 is an downward-opening cover. The top of the top column 17 is rotatably connected to the bottom of the bottom column 16 in a sealed manner. A negative pressure pipe is connected to the bottom of the bottom column 16, and the cavity formed by the top column 17 and the bottom column 16 is continuously under negative pressure. The material tray 2 has several negative pressure channels. One end of each negative pressure channel is connected to the inner cavity of the top column 17, and the other end passes through the top of the positioning station 3 and is connected to the outside. Each negative pressure channel is equipped with a solenoid valve for controlling the opening and closing of the negative pressure channel.

[0057] An auxiliary cylinder 19 is vertically mounted on the top of the base 1. An auxiliary part 20 is mounted on the top of the piston rod of the auxiliary cylinder 19. The auxiliary part 20 is located below the material tray 2.

[0058] A top frame 21 is provided on the top of the base 1, and the printing frame 4 is located on the top frame 21. A support plate 22 is also horizontally provided on the top frame 21. A through-hole 23 is opened in the middle of the support plate 22, and the printing screen 11 is located below the through-hole 23. Two parallel lower edge frames 24 are horizontally provided at the bottom of the support plate 22. The two lower edge frames 24 are located on both sides of the through-hole 23. Telescopic rails 25 are horizontally provided on the opposite sides of the two lower edge frames 24. The longitudinal section of the telescopic rails 25 is... All are in the shape of an inverted T, a dovetail, or an inverted Ω. A telescopic frame 26, rectangular in shape, is horizontally movably arranged between the two telescopic rails 25 and engages with each rail 25. A positioning pin 30 is provided at the top of the telescopic frame 26. A positioning hole 27, cooperating with the positioning pin 30, is provided on the printing screen frame 10. A synchronization part 28, lower than the lower edge frame 24, is horizontally arranged on the side of the telescopic frame 26. A telescopic cylinder 29, for driving the synchronization part 28, is horizontally arranged at the bottom of the support plate 22. Both the synchronization part 28 and the printing screen frame 10 are higher than the material tray 2.

[0059] The printing screen frame 10 has positioning grooves 18 with an inverted T-shaped longitudinal section on both sides. The inner end of the positioning groove 18 horizontally penetrates the printing screen frame 10. Several positioning cylinders 31 are vertically arranged on the support plate 22. The bottom of the piston rod of each positioning cylinder 31 is provided with a cylindrical lifting column 32. The bottom of the lifting column 32 is provided with a disc-shaped lifting plate 33. The lifting column 32 is movably located in the positioning groove 18. The top of the lifting plate 33 abuts against the inner wall of the positioning groove 18. The top of the printing screen frame 10 is attached to the bottom of the support plate 22. Each positioning groove 18 has at least two lifting plates 33.

[0060] A horizontal plate 42 is horizontally arranged at the bottom of the piston rod of the first lifting cylinder 6. Vertical plates 43 are vertically arranged at the bottom of both sides of the horizontal plate 42. A swing shaft 44 is horizontally rotatably arranged between the two vertical plates 43. A swing seat 45 is fixedly arranged on the swing shaft 44. A first adaptation seat 46 is arranged at the bottom of the swing seat 45. The first adaptation seat 46 and the swing seat 45 form an inverted T shape. Force sensors 47 are arranged at the bottom of both ends of the first adaptation seat 46. A second adaptation seat 48 parallel to the first adaptation seat 46 is arranged at the bottom of the two force sensors 47. The doctor blade 8 is made of flexible material and is connected to the bottom of the second adaptation seat 48. A stabilizing rod 49 perpendicular to the second adaptation seat 48 is arranged at the top of the second adaptation seat 48. The stabilizing rod 49 moves through the first adaptation seat 46 and the outer wall of the stabilizing rod 49 is attached to the first adaptation seat 46.

[0061] The vertical plate 43 is provided with a fixing mechanism for fixing the angle of the swing shaft 44. The fixing mechanism includes an electromagnetic brake 50, which is a standard part. When the power is on, it automatically locks the swing shaft 44, and when the power is off, it allows the swing shaft 44 to rotate freely; or when the power is off, it automatically locks the swing shaft 44, and when the power is on, it allows the swing shaft 44 to rotate freely.

[0062] This utility model provides a screen printing device. When printing on a workpiece (such as glass), the workpiece is first placed (either manually by a worker or automatically by a robot, suction cup, etc.) at the positioning station 3 outside the printing screen 11. Then, the material tray 2 is driven by the rotating mechanism to rotate, causing the positioning station 3 with the workpiece to rotate below the printing screen 11 (there is a height difference between the workpiece and the printing screen 11 at this time). Then, the first lifting cylinder 6 lowers the height of the squeegee 8, so that the squeegee 8 acts downward on the top of the printing screen 11 and presses the printing screen 11 to fit against the top of the workpiece. Then, the driving mechanism drives the reciprocating frame 5 to move along the length of the printing frame 4. During this process, the ink located upstream of the squeegee 8 is hung and partially passes through the printing screen 11 (with small holes with the desired pattern) and acts on the surface of the workpiece.

[0063] When the squeegee 8 reaches its maximum stroke, the first lifting cylinder 6 raises the squeegee 8, and then the printing screen 11 naturally rises. At this time, the second lifting cylinder 7 drives the return ink plate 9 downward, so that the bottom of the return ink plate 9 is attached to the top of the printing screen 11 (at this time, the printing screen 11 is higher than the workpiece). Then the reciprocating frame 5 moves back, and the return ink plate 9 drives the excess ink to the standby position to wait for the next stroke by the squeegee 8. At the same time, the material tray 2 rotates and transfers the next workpiece to the bottom of the printing screen 11, waiting for the next printing. The printed workpiece can be removed after rotating to the outside of the printing frame 4 (manually removed by the worker or by using a robot, suction cup, etc.). In this way, the material trays 2 of multiple positioning stations 3 can dynamically realize loading, unloading and printing, improving the efficiency of printing and production.

[0064] In the actual printing process, after the workpiece is placed in the positioning groove 18 (whose depth is less than the thickness of the workpiece; depending on the actual situation, the surface of the positioning station 3 can also be flat, and positioning is achieved solely through negative pressure), the motor (via gears or belts, etc.) drives the top column 17 and the material tray 2 to rotate. During rotation, the negative pressure pipe is connected to the negative pressure pump, ensuring that the inner cavity formed by the bottom column 16 and the top column 17 is continuously under negative pressure. Through the automatic opening and closing of the solenoid valves, negative pressure can be created at the bottom of all workpieces, ensuring stable connection between the workpieces and the material tray 2. When the material tray 2 stops rotating, only the solenoid valve at the bottom of the workpiece opens for unloading; the solenoid valves at other locations open the negative pressure channel, allowing the workpiece to be stably adsorbed. All solenoid valves can be either self-powered (rechargeable) or have slip rings installed in the top column 17 and the bottom column 16, energizing the solenoid valves through these slip rings. This ensures that the solenoid valves remain energized even as the material tray 2 rotates.

[0065] When a workpiece moves to the bottom of the printing screen 11 for printing, the third lifting cylinder 13 also lowers the height of the limiting plate 14 during the printing process, so that the limiting plate 14 is also attached to the top of the printing screen 11. At this time, the ink on both sides of the squeegee 8 can be limited and guided by the limiting plate 14, and the ink moves towards the direction closer to the squeegee, preventing the ink from flowing too far.

[0066] After printing, both the squeegee 8 and the limiting plate 14 rise, and then the return ink plate 9 moves downwards to adhere to the printing screen 11 and reverses direction, driving the ink back to its initial position to await the next printing. The return ink sections 12 on both sides of the return ink plate 9 can concentrate ink over a wider area, allowing for better ink utilization. As printing progresses, manual replenishment of ink is required on the printing screen 11. When the reciprocating frame 5 moves, the motor drives the drive screw to rotate, which in turn drives the linkage unit, causing the reciprocating frame 5 to move horizontally back and forth on the printing frame 4.

[0067] Before printing, the auxiliary cylinder 19 drives the auxiliary part 20 to rise, causing the auxiliary part 20 to contact the bottom of the material tray 2. This ensures that even if the doctor blade 8 or other components apply downward pressure to the material tray 2, the auxiliary part 20 can still provide support, effectively maintaining the structure, position, and stability of the material tray 2. When the material tray 2 needs to rotate, the auxiliary cylinder 19 lowers the height of the auxiliary part 20, ensuring that the auxiliary part 20 does not interfere with the normal rotation of the material tray 2.

[0068] During normal printing, several lifting discs 33 pull the printing screen frame 10 upward under the pulling force of their respective positioning cylinders 31, ensuring that the printing screen frame 10 fits tightly against the bottom of the support plate 22. This guarantees the positional stability of the printing screen frame 10 and the printing screen body 11, as well as the printing quality. When it is necessary to replace or clean the printing screen frame 10 and the printing screen body 11, the positioning cylinder 31 simply moves downward, causing the lifting disc 33 to move to the middle of the positioning groove 18, with neither the top nor the bottom of the lifting disc 33 contacting the inner wall of the positioning groove 18. At this time, the telescopic cylinder 29 drives the synchronizing part 28 to move outward, causing the telescopic frame 26 to also move outward. Meanwhile, the telescopic frame 26 drives the printing screen frame 10 outward simultaneously through the positioning pin 30 until the printing screen frame 10 can be removed from the outside.

[0069] When installing a new or clean printing frame 10 and printing screen 11, simply connect the positioning hole 27 of the printing frame 10 to the positioning pin 30. Then, the telescopic cylinder 29 drives the telescopic frame 26 to move inward to the designated position via the synchronization part 28 and stops. When the telescopic frame 26 moves outward, the lifting plate 33 and the lifting column 32 can disengage from the positioning groove 18. When it moves inward, the lifting plate 33 and the lifting column 32 can re-enter the positioning groove 18. After the telescopic frame 26 reaches the appropriate position, the lifting plate 33 rises, causing the printing frame 10 to abut against the bottom of the support plate 22.

[0070] During actual ink scraping, because the squeegee 8 is elongated, the force it applies to the printing screen 11 may be unbalanced, easily leading to differences in the scraping effect at different locations. For example, if the squeegee 8 applies a small force to the printing screen 11, it can easily result in under-printing. However, since the first adapting seat 46, the second adapting seat 48, and the squeegee 8 can all change angles via the swing seat 45 and the swing shaft 44, the angle of the squeegee 8 can be adjusted during actual printing to ensure that the force applied to the printing screen 11 by the squeegee 8 is more even across different locations, thus guaranteeing printing quality. In actual use, when the squeegee 8 moves downward and contacts the printing screen 11, the squeegee 8 automatically changes angle because the swing shaft 44 can rotate. This allows the two ends of the squeegee 8 to reach a state of equilibrium or near equilibrium of the reaction forces. Then, the angle of the swing shaft 44 is locked by the electromagnetic brake 50, fixing the angle of the squeegee 8 and ensuring even ink scraping. In actual use, if the forces on the two force sensors 47 are unequal or not close (a specific difference is set for closeness), it indicates that the squeegee 8 has not reached an equilibrium state. Conversely, if the pressures on the two force sensors 47 are equal or close, it indicates that the squeegee 8 can act evenly on the printing screen 11, thus ensuring printing quality. This effect of achieving equilibrium is readily apparent. The first adapting seat 46 and the second adapting seat 48 are guided by a stabilizing rod 49, which reduces the horizontal torque or lateral force on the force sensors 47, protecting them.

[0071] Example 2

[0072] The difference from Example 1 is that, as Figures 14 to 15 As shown, a top frame 21 is provided on the top of the base 1, the printing frame 4 is located on the top frame 21, and a support plate 22 is horizontally provided on the top frame 21. A through hole 23 is provided in the middle of the support plate 22, and the printing screen 11 is located below the through hole 23.

[0073] The bottom of the support plate 22 is horizontally provided with parallel inlet / outlet cylinder 34 and first rail. There are two inlet / outlet cylinder 34 and two first rail on both sides of the through-hole 23, and the first rail is located between the inlet / outlet cylinder 34 and the through-hole 23.

[0074] The bottom of the first rail body is horizontally and movably fastened with an inlet / outlet post 35. A second rail body is horizontally arranged on the side of the inlet / outlet post 35 near the through-hole 23. The longitudinal sections of the first rail body and the second rail body are T-shaped, dovetail-shaped, or Ω-shaped. A telescopic frame 26 is horizontally and movably arranged between the two second rail bodies and is movably fastened to the second rail bodies. The telescopic frame 26 is rectangular. A positioning pin 30 is provided on the top of the telescopic frame 26. A positioning hole 27 that cooperates with the positioning pin 30 is opened on the printing screen frame 10.

[0075] The inlet / outlet column 35 is rotatably provided with a first wheel 36 and a second wheel 37 on the side near the inlet / outlet cylinder 34. A transmission belt 38 is movably sleeved on the outer wall of the first wheel 36 and the second wheel 37. A fixed seat 39 is provided at the bottom of the support plate 22 and is fixedly connected to the top of the transmission belt 38. A transmission part 40 is horizontally fixed at the bottom of the transmission belt 38. The free end of the transmission part 40 is fixedly connected to the telescopic frame 26. A linkage body 41 is provided on the inlet / outlet column 35 and is fixedly connected to the piston rod of the inlet / outlet cylinder 34.

[0076] When cleaning or replacing the printing screen 11, the piston rod of the inlet / outlet cylinder 34 only needs to extend and drive the linkage 41 outward, which in turn drives the inlet / outlet column 35 to move outward. At the same time, since the top of the transmission belt 38 is fixed by the fixed seat 39, the bottom of the transmission belt 38 can move (rotate and move outward at the same time), and drive the telescopic frame 26 outward through the transmission part 40. At the same time, the transmission belt 38, the inlet / outlet column 35 and other structures achieve a doubling of the effect. That is, for example, if the piston rod of the inlet / outlet cylinder 34 only extends by a distance, then the telescopic frame 26 moves outward by a distance b, and b > a. This reduces the length requirement of the inlet / outlet cylinder 34, thus controlling the overall size of the equipment.

[0077] Example 3

[0078] The difference from Embodiment 1 is that the fixing mechanism includes a fixing seat 39, which is fixedly disposed on the outer side of the vertical plate 43. A fixing screw is threadedly connected to the fixing seat 39, and the end of the fixing screw abuts against the outer wall of the swing shaft 44. In initial use, the fixing screw is loosened, at which point the swing shaft 44 can swing, allowing the forces acting on various parts of the printing screen 11 to be relatively close. When the values ​​transmitted by the two force sensors 47 are relatively close, the fixing screw is tightened. At this point, the angles of the first adapting seat 46, the second adapting seat 48, and the doctor blade 8 can be fixed, thereby improving the doctor blade quality.

[0079] It should also be noted that all terms such as "set up" and similar descriptive words in this application (especially the specification) indicate that two structures have or exist a connection relationship. However, the specific means by which the two are connected are not limited in detail, and are usually conventional connection methods. That is, the means should be understood as prior art and do not need to be elaborated. For example, "m is set up with n" only indicates that structure m has structure n, and whether the two are connected by welding, riveting, adhesive, or integral molding is within the scope of protection of this application. Similarly, "x is rotatably set up with y" only indicates that y and x can rotate relative to each other, and whether the two are connected by a bearing, or whether y directly passes through x and is rotatably connected to x, or other feasible methods, are all within the scope of protection of this application.

[0080] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A screen printing apparatus characterized by comprising: include: The base (1) and the material tray (2) are horizontally rotatably connected to the top of the base (1). The top of the material tray (2) is provided with several positioning stations (3) for fixing the workpiece. The base (1) is provided with a rotating mechanism for driving the material tray (2) to rotate. A printing frame (4) is located above the base (1). A reciprocating frame (5) is horizontally and reciprocatingly mounted on the printing frame (4). A driving mechanism for driving the reciprocating frame (5) to reciprocate is provided on the printing frame (4). The first lifting cylinder (6) and the second lifting cylinder (7) are both vertically arranged on the reciprocating frame (5). The bottom of the piston rod of the first lifting cylinder (6) is horizontally provided with a scraper (8), and the bottom of the piston rod of the second lifting cylinder (7) is horizontally provided with a return ink plate (9). A printing frame (10) is rectangular, and a printing screen body (11) is provided on the inner side of the printing frame (10). The squeegee (8) and the ink return plate (9) are both located above the printing screen body (11). Any of the positioning stations (3) can be moved to the bottom of the printing screen body (11).

2. A screen printing apparatus according to claim 1, wherein Both ends of the ink return plate (9) are provided with ink return parts (12) at an angle. The bottom of the ink return part (12) is at the same height as the bottom of the ink return plate (9), and the two ink return parts (12) and the ink return plate (9) form a C-shape with the opening facing the scraper plate (8).

3. The screen printing equipment according to claim 2, characterized in that, Two third lifting cylinders (13) are vertically arranged on the printing frame (4). The bottom of the piston rod of the third lifting cylinder (13) is horizontally provided with a limiting plate (14). The squeegee (8) is located between the limiting plate (14) and the ink return plate (9). The trajectories of the two ends of the squeegee (8) coincide with the trajectories of the two limiting plates (14). The limiting plate (14) is used to guide the ink outside the two ends of the squeegee (8) toward the squeegee (8).

4. The screen printing equipment according to claim 1, characterized in that, A drive port (15) is provided vertically through the middle of the printing frame (4). The reciprocating frame (5) is movably fastened to the outer wall of the printing frame (4), and a linkage part is provided in the middle of the reciprocating frame (5). The linkage part is movably attached to the inner wall of the drive port (15). The drive mechanism includes a drive screw that is horizontally rotatably connected to both ends of the printing frame (4) and a motor for driving the drive screw to rotate. The drive screw passes through the linkage part and is threadedly engaged with the linkage part.

5. The screen printing equipment according to claim 1, characterized in that, The rotating mechanism includes a bottom column (16) fixedly disposed on the top of the base (1) and a top column (17) rotatably connected to the top of the bottom column (16). The base (1) is provided with a motor for driving the top column (17) to rotate. The material tray (2) is fixedly connected to the top column (17). Each of the positioning stations (3) has a positioning groove (18) at its top that matches the shape of the workpiece.

6. The screen printing equipment according to claim 5, characterized in that, The bottom column (16) is an upward-opening cover, and the top column (17) is an downward-opening cover. The top of the top column (17) and the bottom of the bottom column (16) are connected in a sealed rotational manner. A negative pressure pipe is provided at the bottom of the bottom column (16), and the cavity formed by the top column (17) and the bottom column (16) is continuously under negative pressure. Several negative pressure channels are provided in the material tray (2). One end of each negative pressure channel is connected to the inner cavity of the top column (17), and the other end passes through the top of the positioning station (3) and is connected to the outside. Each negative pressure channel is provided with a solenoid valve for controlling the opening and closing of the negative pressure channel.

7. The screen printing equipment according to claim 1, characterized in that, An auxiliary cylinder (19) is vertically arranged on the top of the base (1), and an auxiliary part (20) is arranged on the top of the piston rod of the auxiliary cylinder (19). The auxiliary part (20) is located below the material tray (2). A top frame (21) is provided on the top of the base (1), and the printing frame (4) is located on the top frame (21). A support plate (22) is also horizontally provided on the top frame (21). A through-hole (23) is provided in the middle of the support plate (22). The printing screen (11) is located below the through-hole (23). Two parallel lower edge frames (24) are horizontally provided at the bottom of the support plate (22). The two lower edge frames (24) are located on both sides of the through-hole (23). Telescopic rails (25) are horizontally provided on the opposite sides of the two lower edge frames (24). The longitudinal direction of the telescopic rails (25) is as follows: The cross-sections are all inverted T-shaped, dovetail-shaped, or inverted Ω-shaped. A telescopic frame (26) that engages with the telescopic rail (25) is horizontally movably arranged between the two telescopic rails (25). The telescopic frame (26) is rectangular. A positioning pin (30) is provided on the top of the telescopic frame (26). A positioning hole (27) that cooperates with the positioning pin (30) is opened on the printing frame (10). A synchronization part (28) that is lower than the lower edge frame (24) is horizontally arranged on the side of the telescopic frame (26). A telescopic cylinder (29) for driving the synchronization part (28) to move is horizontally arranged at the bottom of the support plate (22).

8. The screen printing equipment according to claim 1, characterized in that, The base (1) is provided with a top frame (21) on top, the printing frame (4) is located on the top frame (21), and a support plate (22) is also horizontally provided on the top frame (21). A through hole (23) is opened in the middle of the support plate (22), and the printing screen (11) is located below the through hole (23). The bottom of the support plate (22) is horizontally provided with parallel inlet and outlet cylinders (34) and a first rail. There are two inlet and outlet cylinders (34) and two first rails on both sides of the through-hole (23), and the first rail is located between the inlet and outlet cylinders (34) and the through-hole (23). The bottom of the first rail body is horizontally and movably fastened with an inlet / outlet post (35). The inlet / outlet post (35) is horizontally arranged with a second rail body on the side near the through-hole (23). The longitudinal sections of the first rail body and the second rail body are T-shaped, dovetail-shaped, or Ω-shaped. A telescopic frame (26) that is movably fastened to the second rail body is horizontally and movably arranged between the two second rail bodies. The telescopic frame (26) is rectangular. A positioning pin (30) is provided on the top of the telescopic frame (26). A positioning hole (27) that cooperates with the positioning pin (30) is opened on the printing screen frame (10). The inlet / outlet column (35) is rotatably provided with a first wheel (36) and a second wheel (37) on the side near the inlet / outlet cylinder (34). A transmission belt (38) is movably sleeved on the outer wall of the first wheel (36) and the second wheel (37). A fixed seat (39) is provided at the bottom of the support plate (22) and is fixedly connected to the top of the transmission belt (38). A transmission part (40) is horizontally fixed at the bottom of the transmission belt (38). The free end of the transmission part (40) is fixedly connected to the telescopic frame (26). A linkage body (41) is provided on the inlet / outlet column (35) and is fixedly connected to the piston rod of the inlet / outlet cylinder (34).

9. A screen printing device according to claim 7 or 8, characterized in that, The printing screen frame (10) has positioning grooves (18) with an inverted T-shaped longitudinal section on both sides. The inner end of the positioning groove (18) horizontally penetrates the printing screen frame (10). Several positioning cylinders (31) are vertically arranged on the support plate (22). The bottom of the piston rod of each positioning cylinder (31) is provided with a cylindrical lifting column (32). The bottom of the lifting column (32) is provided with a disc-shaped lifting plate (33). The lifting column (32) is movably located in the positioning groove (18). The top of the lifting plate (33) abuts against the inner wall of the positioning groove (18). The top of the printing screen frame (10) is attached to the bottom of the support plate (22). Each positioning groove (18) has at least two lifting plates (33).

10. A screen printing device according to claim 1, characterized in that, A horizontal plate (42) is horizontally arranged at the bottom of the piston rod of the first lifting cylinder (6). Vertical plates (43) are vertically arranged at the bottom of both sides of the horizontal plate (42). A swing shaft (44) is horizontally rotatably arranged between the two vertical plates (43). A swing seat (45) is fixedly arranged on the swing shaft (44). A first adapting seat (46) is arranged at the bottom of the swing seat (45). The first adapting seat (46) and the swing seat (45) form an inverted T-shape. Force sensors are arranged at the bottom of both ends of the first adapting seat (46). (47) A second adaptation seat (48) parallel to the first adaptation seat (46) is provided at the bottom of the two force sensors (47). The scraper (8) is made of flexible material and is connected to the bottom of the second adaptation seat (48). A stabilizing rod (49) perpendicular to the second adaptation seat (48) is provided at the top of the second adaptation seat (48). The stabilizing rod (49) moves through the first adaptation seat (46) and the outer wall of the stabilizing rod (49) is attached to the first adaptation seat (46). A fixing mechanism for fixing the angle of the swing axis (44) is provided on the vertical plate (43), the fixing mechanism comprising: Electromagnetic brake (50), or A fixed seat (39) is fixedly disposed on the outside of the vertical plate (43). A fixing screw is threadedly connected to the fixed seat (39), and the end of the fixing screw abuts against the outer wall of the swing shaft (44).

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