An automatic screen printing machine for PCB boards

Abstract

The present invention relates to the technical field of PCB board production equipment, and in particular to an automatic screen printing machine for PCB boards, comprising a frame, a workbench, a screen printing platform and a cylinder, wherein the frame is provided with a workbench, the screen printing platform and the cylinder are installed on the frame, the cylinder is connected to the screen printing platform, and further comprises a moving mechanism, a clamping mechanism and a flipping mechanism, etc., wherein a moving mechanism is provided in the frame for moving the PCB board, a clamping mechanism for fixing the PCB board is provided on the moving mechanism, and the clamping mechanism is connected to a flipping mechanism for rotating the PCB board. Through the guide plate and the sliding rod of the moving mechanism, the loading area of ​​the PCB board is kept away from the screen printing platform, thereby protecting the safety of the staff during loading and unloading, and the PCB board is fixed from both sides by the clamping mechanism, and the PCB board is flipped by turning the handle, which can reduce the number of loading and unloading, improve the production efficiency, and make the production process more stable.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB production equipment, and in particular to an automatic screen printer for PCB boards. Background Art

[0002] As the core component of modern electronic devices, printed circuit boards (PCBs) carry the connection and support functions of electronic components. The precision and efficiency of their manufacturing process are directly related to the performance and cost of electronic products. In the production process of PCBs, screen printers play a vital role. They use specific screen printing screens and inks to accurately form conductive lines or solder mask patterns on the surface of PCBs, which is a key step in realizing circuit graphics. Screen printers are widely used in consumer electronics, communication equipment, automotive electronics and other fields. Their automation level directly affects the production efficiency and quality of PCBs.

[0003] Although the screen printers currently on the market have achieved automated control during the printing process, such as precise ink coating and precise positioning of patterns, they still generally rely on manual operation in the loading and unloading process. Specifically, workers need to manually place the PCB board to be printed on the workbench of the screen printer and perform preliminary positioning. Subsequently, the screen printer automatically completes the core steps such as ink supply, reciprocating motion of the scraper, and printing of the pattern. However, after printing is completed, workers still need to manually remove the printed PCB board and re-place the new board to be printed to continue the next round of production.

[0004] During the screen printing process, workers need to frequently reach into the machine, which is not only cumbersome to operate, but may also cause hand fatigue and the risk of misoperation. Secondly, for PCB boards that need double-sided printing, existing screen printing machines usually require workers to remove the PCB board, flip it over and put it back on the machine to print the other side after one side is printed. This undoubtedly increases the number and complexity of loading and unloading materials in the production process, further reducing production efficiency. In addition, the instability of manual operation may also cause fluctuations in product quality and affect the quality of PCB board printing. Summary of the invention

[0005] In order to overcome the risks in the printing process and the disadvantages of low double-sided printing efficiency, the present invention provides an automatic and stable screen printer for PCB boards.

[0006] An automatic screen printing machine for PCB boards comprises a frame, a workbench, a screen printing platform and a cylinder. The frame is provided with a workbench, the screen printing platform and the cylinder are installed on the frame, the cylinder is connected to the screen printing platform, the cylinder is used to control the screen printing platform to move up and down, so as to realize the printing process of the screen printing platform on the PCB board, and also comprises a moving mechanism, a clamping mechanism and a flipping mechanism. The frame is provided with a moving mechanism for moving the PCB board, the moving mechanism is provided with a clamping mechanism for fixing the PCB board, and the clamping mechanism is connected with a flipping mechanism for rotating the PCB board.

[0007] Optionally, the moving mechanism includes a guide plate, a pushing rod, a transmission part, an anti-slip rod, a sliding rod, a support rod and a placement plate. The two guide plates are fixedly connected to the frame, the guide plates are located on the left and right sides of the workbench, the left and right ends of the bottom rear end of the silk-screen printing platform are fixedly connected with transmission parts, the bottom of the transmission part is slidably connected with an anti-slip rod, the other end of the anti-slip rod is slidably connected with a pushing rod, a sliding rod is connected between the two pushing rods, a guide groove is opened on the guide plate, the sliding rod is slidably connected in the guide groove, both ends of the sliding rod are connected with support rods, and a placement plate is fixedly connected to the support rod.

[0008] Optionally, the clamping mechanism includes a fixed plate, a connecting rod, an upper clamping plate, a lower clamping plate, a guide rod, a fixed sheet, an elastic member I, a connecting member and a torsion spring. A circular hole is opened in the middle of the left and right sides of the placement plate, a fixed sheet is rotatably connected in the circular hole, the guide rod is slidably connected to the middle of the fixed sheet, one end of the guide rod is fixedly connected to the connecting rod, the middle of the left and right sides of the placement plate are rotatably connected to the fixed plate, the guide rod and the connecting rod are both slidably connected to the fixed plate, the other end of the guide rod is fixedly connected to the connecting member, another fixed sheet is fixedly connected to the guide rod, the guide rod is sleeved with an elastic member I, and the elastic member I The two ends are respectively connected to two fixed plates, the connecting rod is slidably connected to the fixed plate, and each fixed plate is rotatably connected to four upper splints, which are distributed on the front and back sides. The upper splint is rotatably connected to the fixed plate through a hinge rod, and the end of the connecting rod passes through the upper splint, and each upper splint is hinged with a lower splint, the upper splint and the lower splint are respectively located on the upper and lower sides of the end of the connecting rod, and are squeezed together with the connecting rod. A torsion spring is provided on the upper splint, one end of the torsion spring is connected to the upper splint, and the other end is connected to the lower splint. An anti-collision groove is opened at the bottom of the silk-screen printing platform, and the anti-collision groove is located directly above the upper splint.

[0009] Optionally, the flipping mechanism includes a rotating rod, a rotating handle, a semi-spherical rod and an elastic member II. The rotating rod is rotatably connected in the round hole. One end of the rotating rod is connected to the connecting member, and the other end is slidably connected to the rotating handle. The other end of the rotating handle is slidably connected to the semi-spherical rod. An elastic member II is arranged in the rotating handle. One end of the elastic member II is connected to the rotating handle, and the other end is connected to the semi-spherical rod. Circular grooves are opened on both sides of the placement plate, and the semi-spherical rod is snap-fitted with the circular grooves.

[0010] Optionally, it also includes a support frame and a support plate, the support frame is fixedly connected to the frame, the support plate is connected to the support frame, and the support plate is located below the placement plate.

[0011] Optionally, it also includes an I-plate, a motor, a belt, a screw rod, a sliding frame, an inclined guide rail and a top rod, wherein the bottoms of multiple support rods are commonly connected to the I-plate, both ends of the I-plate are rotatably connected to screw rods, belts are sleeved on the bottoms of the two screw rods, the motor is installed at the bottom of the I-plate, the bottom of one of the screw rods is connected to the motor output shaft, the support rod is connected to the inclined guide rail, the screw rod is threadedly connected to the sliding frame, the sliding frame is slidably connected to the support rod, the sliding frame is rotatably connected to the top rod, and the top rod is slidably connected to the inclined guide rail.

[0012] Optionally, it also includes a hollow top frame, a U-plate, a sliding rod and an elastic member III, the U-plate is connected to the bottom of the placement plate, the U-plate is slidably connected to the hollow top frame, the bottom of the hollow top frame is provided with an arc surface, which is extruded and matched with the sliding frame, the top of the hollow top frame passes through the placement plate and is extruded and matched with the connecting member, the middle of the hollow top frame is connected with a sliding rod, the sliding rod is sleeved with an elastic member III, one end of the elastic member III is connected to the U-plate, and the other end is connected to the hollow top frame.

[0013] Optionally, it also includes rubber wheels, the ends of the upper clamping plate and the lower clamping plate are rotatably connected with the rubber wheels, and the top of the push rod is rotatably connected with the rubber wheels.

[0014] Optionally, one end of the connecting piece connected to the guide rod is rounded, and the top of the hollow top frame is chamfered, with its tip being arranged at the side of the rounded corner of the connecting piece.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. By moving the guide plate and sliding rod of the mechanism, the loading area of ​​the PCB board is kept away from the screen printing platform, thereby protecting the safety of the staff during loading and unloading. The PCB board is fixed from both sides by the clamping mechanism, and the PCB board is turned over by turning the handle, which can reduce the number of loading and unloading, improve production efficiency, and make the production process more stable.

[0017] 2. The PCB board is supported by the movable ejector rod, so that the PCB board can be kept stable when it is moved. The hollow ejector frame is released by the cooperation with the connector, which makes loading and unloading more convenient and optimizes the printing process of the PCB board. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a structural cross-sectional view of the frame of the present invention;

[0020] Figure 3 It is a schematic diagram of the installation structure of the moving mechanism, the clamping mechanism and the turning mechanism of the present invention;

[0021] Figure 4 It is a structural cross-sectional view of the workbench of the present invention;

[0022] Figure 5 It is a cross-sectional view of the connection structure of the clamping mechanism and the turning mechanism of the present invention;

[0023] Figure 6 It is a schematic diagram of the connection structure of the connecting rod, the upper clamping plate and the lower clamping plate of the present invention;

[0024] Figure 7 It is a cross-sectional view of the turning handle of the present invention;

[0025] Figure 8 This is a schematic diagram of the connection structure of the I-plate, the motor and the belt of the present invention;

[0026] Fig. 9 It is a schematic diagram of the connection structure of the inclined guide rail, the top rod and the hollow top frame of the present invention;

[0027] Fig.10 It is a front view of a partial structure of the present invention.

[0028] The meanings of the reference numerals in the figure are: 1: frame, 101: workbench, 2: screen printing platform, 201: anti-collision groove, 3: cylinder, 4: moving mechanism, 41: guide plate, 411: guide groove, 42: push rod, 43: transmission member, 44: anti-slip rod, 45: sliding rod, 46: support rod, 47: placement plate, 48: round hole, 49: round groove, 5: clamping mechanism, 51: fixing plate, 52: connecting rod, 53: upper clamping plate, 54: lower clamping plate, 55: guide Toward rod, 56: fixing plate, 57: elastic member I, 58: connecting member, 59: torsion spring, 510: rubber wheel, 6: flip mechanism, 61: turning rod, 62: turning handle, 63: hemispherical rod, 64: elastic member II, 7: supporting frame, 71: supporting plate, 8: I plate, 81: motor, 82: belt, 83: screw rod, 84: sliding frame, 85: inclined guide rail, 86: top rod, 9: hollow top frame, 91: U plate, 92: sliding rod, 93: elastic member III. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0030] Embodiment: An automatic screen printer for PCB boards, such as Figure 1-Figure 3 As shown, it includes a frame 1, a workbench 101, a screen printing platform 2 and a cylinder 3. The frame 1 is provided with a workbench 101. The screen printing platform 2 and the cylinder 3 are installed on the frame 1. The cylinder 3 is connected to the screen printing platform 2. The cylinder 3 is used to control the screen printing platform 2 to move up and down to realize the printing process of the screen printing platform 2 on the PCB board. The printing process includes the steps of accurate coating of ink, accurate positioning of patterns, drying and fixing of materials, etc. It also includes a moving mechanism 4, a clamping mechanism 5 and a flipping mechanism 6. The frame 1 is provided with a moving mechanism 4. The moving mechanism 4 is used to move the PCB board. The moving mechanism 4 is provided with a clamping mechanism 5 for fixing the PCB board. The clamping mechanism 5 is connected to the flipping mechanism 6 for rotating the PCB board.

[0031] like Figure 2-Figure 4 As shown, the moving mechanism 4 includes a guide plate 41, a push rod 42, a transmission member 43, an anti-slip rod 44, a sliding rod 45, a support rod 46 and a placement plate 47. The two guide plates 41 are fixedly connected to the frame 1. The guide plates 41 are located on the left and right sides of the workbench 101. The top of the guide plate 41 is flush with the top surface of the workbench 101. The left and right sides of the bottom of the rear end of the screen printing platform 2 are fixedly connected with transmission members 43. The transmission member 43 is located in the frame 1, and the cylindrical part of the transmission member 43 is a telescopic member with an elastic member arranged inside. The bottom of the transmission member 43 is slidably connected to the anti-slip rod 44, and the other end of the anti-slip rod 44 is slidably connected to the push rod 42. Both ends of the anti-slip rod 44 are provided with discs larger than the middle diameter. Figure 3 , so it can prevent the anti-drop rod 44 from falling off from the transmission member 43 and the pushing rod 42. A sliding rod 45 is connected between the two pushing rods 42. A guide groove 411 is opened on the guide plate 41. The sliding rod 45 is slidably connected in the guide groove 411. The guide groove 411 is tilted as a whole, but vertical areas are set at the top and bottom. Since the transmission member 43 itself is retractable, when the sliding rod 45 is located at the bottom of the guide groove 411, the screen printing platform 2 needs to continue to move downward to compress the transmission member 43 before the printing work on the PCB board can be completed. Support rods 46 are connected to both ends of the sliding rod 45. A placement plate 47 is fixedly connected to the support rod 46. A through hole is opened in the middle of the placement plate 47 for connecting the clamping mechanism 5 and also for flipping the PCB board.

[0032] like Figure 4-Figure 6As shown, the clamping mechanism 5 includes a fixed plate 51, a connecting rod 52, an upper clamping plate 53, a lower clamping plate 54, a guide rod 55, a fixing plate 56, an elastic member I57, a connecting member 58 and a torsion spring 59. A circular hole 48 is opened in the middle of the left and right sides of the placement plate 47. A fixing plate 56 is rotatably connected in the circular hole 48. The guide rod 55 is slidably connected to the middle of the fixing plate 56. One end of the guide rod 55 is fixedly connected to the connecting rod 52. The middle of the left and right sides of the placement plate 47 are rotatably connected to the fixed plate 51. The guide rod 55 and the connecting rod 52 are both slidably connected to the fixed plate 51. The other end of the guide rod 55 is fixedly connected to the connecting member 58. Another fixing plate 56 is fixedly connected to the guide rod 55. The guide rod 55 is sleeved with an elastic member I57. The two ends of component I 57 are respectively connected to two fixing plates 56, and the connecting rod 52 is slidably connected to the fixing plate 51. Four upper clamping plates 53 are rotatably connected to each fixing plate 51, which are distributed on the front and rear sides. The upper clamping plate 53 is rotatably connected to the fixing plate 51 through a hinge rod. The end of the connecting rod 52 passes through the upper clamping plate 53, and each upper clamping plate 53 is hinged with a lower clamping plate 54. The upper clamping plate 53 and the lower clamping plate 54 are respectively located on the upper and lower sides of the end of the connecting rod 52, and are squeezed and matched with the connecting rod 52. A torsion spring 59 is provided on the upper clamping plate 53, and one end of the torsion spring 59 is connected to the upper clamping plate 53, and the other end is connected to the lower clamping plate 54. An anti-collision groove 201 is opened at the bottom of the silk-screen platform 2, and the anti-collision groove 201 is located directly above the upper clamping plate 53.

[0033] like Figure 5 and Figure 7 As shown, the flip mechanism 6 includes a rotating rod 61, a rotating handle 62, a semi-spherical rod 63 and an elastic member II 64. The rotating rod 61 is rotatably connected in the circular hole 48. One end of the rotating rod 61 is connected to the connecting member 58, and the other end is slidably connected to the rotating handle 62. The rotating handle 62 is rotatably connected to the placement plate 47. The semi-spherical rod 63 is slidably connected to the rotating handle 62. An elastic member II 64 is arranged in the rotating handle 62. One end of the elastic member II 64 is connected to the rotating handle 62, and the other end is connected to the semi-spherical rod 63. Circular grooves 49 are opened on both sides of the placement plate 47, and the semi-spherical rod 63 is snap-fitted with the circular grooves 49.

[0034] In the initial state, the cylinder 3 contracts, and the screen printing platform 2 is located at the upper part of the frame 1, which is farthest from the workbench 101. At this time, the staff can place the PCB board to be printed on the placement plate 47, fix it through the upper clamping plate 53 and the lower clamping plate 54, and then start the printing equipment. The cylinder 3 pushes the screen printing platform 2 down, and through the cooperation of the various components of the moving mechanism 4, the PCB board is moved to the middle of the workbench 101, and the clamping mechanism 5 remains fixed. Then the screen printing platform 2 prints the PCB board. This printing process includes the steps of precise coating of ink, precise positioning of patterns, drying and fixing of materials, etc. After completing the printing on one side, the cylinder 3 pulls up the screen printing platform 2, and the moving mechanism 4 pushes out the PCB board. The staff flips the PCB board through the flipping mechanism 6, repeats the above printing steps, and completes the printing on the other side, thereby completing the printing on both sides of the PCB board, wherein the PCB board does not need to be taken out, saving the time of loading and unloading, and improving the production efficiency. Then the double-sided printed PCB board is taken out and the PCB board to be printed is put in. The following is supplemented with the specific operation steps and component coordination of different mechanisms respectively;

[0035] Regarding the cooperation between the moving mechanism 4 and the screen printing platform 2, it is necessary to supplement that: a transmission member 43 is connected to the bottom of the screen printing platform 2, and the transmission member 43 moves up and down with the screen printing platform 2, and is slidably connected with the push rod 42 through the anti-slip rod 44, thereby driving the sliding rod 45 to move up and down, and when the sliding rod 45 moves with the push rod 42, it slides along the guide groove 411 of the guide plate 41, so that the placement plate 47 can be pushed out, and the PCB board can be pushed out from the bottom of the screen printing platform 2. When loading and unloading materials, the staff does not need to put their hands into the machine, which improves the safety of the working process, and the guide groove 411 is tilted as a whole, but the top and bottom are provided with horizontal areas, which can ensure that the placement plate 47 can be lifted vertically at the end, and cooperate with the opening of the workbench 101;

[0036] When the clamping mechanism 5 is fixing the PCB board, the staff puts one end of the PCB board against the connecting rod 52, and the connecting rod 52 moves outward, squeezing the upper clamping plate 53 and the lower clamping plate 54 at the same time, pushing the upper clamping plate 53 and the lower clamping plate 54 to open to both sides, thereby twisting the torsion spring 59, and pushing the connecting rod 52 and the guide rod 55 to move, and the elastic member I 57 is deformed, and then the other end of the PCB board is inserted between the upper clamping plate 53 and the lower clamping plate 54 on the other side. After the PCB board is released, the elastic member I 57 is reset, and the torsion spring 59 is twisted back, so that the upper clamping plate 53 and the lower clamping plate 54 clamp the PCB board together, and when removing it, buckle one side of the PCB board and push it to the other side, so that the buckled side leaves the middle of the upper clamping plate 53 and the lower clamping plate 54, and can be directly lifted, and then take one side of the PCB board, and the PCB board can be removed;

[0037] When the PCB needs to be flipped, the handle 62 is directly turned, and the handle 62 drives the rotating rod 61 to rotate. At the same time, the semi-spherical rod 63 leaves the circular groove 49, and the elastic part II 64 is compressed. The rotating rod 61 drives the entire clamping mechanism 5 to flip through the connecting member 58 and the guide rod 55, thereby driving the PCB to flip. When the semi-spherical rod 63 leaves the circular groove 49, the elastic part II 64 rebounds. When the PCB is about to be flipped, the semi-spherical rod 63 contacts the placement plate 47 again, and the semi-spherical rod 63 slides into the handle 62 to squeeze the elastic part II 64. When the handle 62 is flipped 180 degrees, the semi-spherical rod 63 is reinserted into the circular groove 49 under the push of the elastic part II 64, reminding the staff that the 180-degree flip has been completed. In addition, the semi-spherical rod 63 and the circular groove 49 are squeezed and matched under the action of the elastic part II 64, which can effectively limit the rotation of the handle 62 and the clamping mechanism 5 and keep the PCB stable.

[0038] like Figure 1 and Figure 3 As shown, it also includes a support frame 7 and a support plate 71. The support frame 7 is fixedly connected to the frame 1. The support plate 71 is connected to the support frame 7. The support plate 71 is located below the through hole of the placement plate 47.

[0039] During the printing process of the PCB board, the bottom is auxiliary supported by the support plate 71, which can effectively prevent the PCB board from bending during printing and affecting the printing quality. The printed side has been solidified and will not damage the printed coating when it is in vertical contact with the support plate 71. In addition, a gasket is laid on the support plate 71 to further protect the PCB board.

[0040] like Figure 8 and Fig. 9 As shown, it also includes an I-plate 8, a motor 81, a belt 82, a screw rod 83, a sliding frame 84, an inclined guide rail 85 and a top rod 86. The bottoms of multiple support rods 46 are commonly connected to the I-plate 8. The two ends of the I-plate 8 are rotatably connected to the screw rods 83. A belt 82 is arranged between the bottoms of the two screw rods 83 through a pulley sleeve. The motor 81 is installed at the bottom of the I-plate 8. The bottom of the left screw rod 83 is connected to the output shaft of the motor 81. The side close to the support rods 46 on both sides is connected to the inclined guide rail 85. The screw rod 83 is threadedly connected to The sliding frame 84 is slidably connected to the support rod 46, and a push rod 86 is rotatably connected to the sliding frame 84. A sliding shaft is set in the middle of the push rod 86. The push rod 86 is slidably connected to the inclined guide rail 85 through the sliding shaft. The top of the push rod 86 contacts the PCB board. When loading and unloading, the motor 81 drives the screw rod 83 to rotate, pushing the sliding frame 84 and the push rod 86 to move upward, and the push rod 86 gradually tilts, thereby supporting the bottom of the PCB board to support the PCB board, effectively preventing the PCB board from falling.

[0041] like Fig. 9 and Fig.10As shown, it also includes a hollow top frame 9, a U-plate 91, a sliding rod 92 and an elastic member III 93. The U-plate 91 is connected to the bottom of the placement plate 47. The hollow top frame 9 is slidably connected to the U-plate 91. The bottom of the hollow top frame 9 is provided with an arc surface, which is extruded and matched with the sliding frame 84. The top of the hollow top frame 9 passes through the placement plate 47 and is extruded and matched with the connecting member 58. A sliding rod 92 is connected in the middle of the hollow top frame 9. An elastic member III 93 is sleeved on the sliding rod 92. One end of the elastic member III 93 is connected to the U-plate 91, and the other end is connected to the hollow top frame 9. The end of the connecting member 58 connected to the guide rod 55 is rounded, and the top of the hollow top frame 9 is chamfered, and its tip is set to the side with the rounded corner of the connecting member 58. The sliding frame 84 pushes the hollow top frame 9, and the top of the hollow top frame 9 is extruded and matched with the connecting member 58, thereby driving the connecting rod 52 to slide to both sides. The connecting rod 52 squeezes the upper clamping plate 53 and the lower clamping plate 54 to release the clamping of the PCB board.

[0042] When the PCB board is flipped, the motor 81 is in the off state, and the sliding frame 84 will not move upward; when the placement plate 47 moves upward and needs to be unloaded, the motor 81 is immediately turned on, and the motor 81 drives the screw rod 83 to rotate. The motor 81 uses the belt 82 to make another screw rod 83 rotate synchronously, so that the two screw rods 83 push the sliding frame 84 and the top rod 86 to move upward. In the process of moving upward, the top rod 86 slides along the inclined guide rail 85, gradually tilts, and then presses against the bottom of the PCB board, thereby supporting the PCB board. The sliding frame 84 moves up to push the hollow top frame 9, compressing the elastic member III 93. The top of the hollow top frame 9 is squeezed and matched with the connecting member 58, thereby driving the connecting rod 52 to slide to both sides, and the connecting rod 52 squeezes the upper clamping plate 53 and the lower clamping plate 54. The elastic member Ⅰ57 is deformed, and the torsion spring 59 is twisted to release the clamping of the PCB board, which is convenient for unloading. After unloading, it only needs to be placed on the top rod 86, and the two ends are inserted between the upper clamping plate 53 and the lower clamping plate 54. When the placement plate 47 moves downward, the motor 81 rotates in the opposite direction, and drives the sliding frame 84 to move downward through the screw rod 83, so that the sliding frame 84 is separated from the hollow top frame 9. Under the action of the rebound force of the elastic member III 93, the hollow top frame 9 is reset downward and separated from the connecting member 58. The rebound force of the elastic member Ⅰ57 and the torsion force of the torsion spring 59 reset the upper clamping plate 53 and the lower clamping plate 54 to clamp the PCB board. The top rod 86 follows the sliding frame 84 to descend and reset along the inclined guide rail 85. Before the placement plate 47 stops moving, the sliding frame 84 has completed the reset and the motor 81 is turned off.

[0043] like Figure 6 and Fig. 9 As shown, it also includes a rubber wheel 510. The ends of the upper clamping plate 53 and the lower clamping plate 54 are rotatably connected with the rubber wheel 510. The top of the top rod 86 is rotatably connected with the rubber wheel 510. The rubber wheels 510 are of different sizes and are all in contact with the PCB board.

[0044] When the upper clamping plate 53 and the lower clamping plate 54 are clamping the PCB board, the rubber wheel 510 can optimize the clamping effect and provide certain protection for the PCB board. When the ejector rod 86 contacts the PCB board, the rubber wheel 510 can also buffer the pressure between the ejector rod 86 and the PCB board, thereby providing certain protection for the PCB board.

[0045] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An automatic screen printing machine for PCB boards, comprising a frame (1), a workbench (101), a screen printing platform (2) and a cylinder (3), wherein the frame (1) is provided with the workbench (101), the screen printing platform (2) and the cylinder (3) are mounted on the frame (1), the cylinder (3) is connected to the screen printing platform (2), and the cylinder (3) is used to control the screen printing platform (2) to move up and down, so as to realize the printing process of the screen printing platform (2) on the PCB board, wherein the characteristics are: The machine frame (1) further comprises a moving mechanism (4), a clamping mechanism (5) and a flipping mechanism (6). The moving mechanism (4) is arranged in the frame (1) for moving the PCB board. The moving mechanism (4) is arranged on the clamping mechanism (5) for fixing the PCB board. The clamping mechanism (5) is connected to the flipping mechanism (6) for rotating the PCB board. The moving mechanism (4) comprises a guide plate (41), a push rod (42), a transmission member (43), an anti-slip rod (44), a sliding rod (45), a support rod (46) and a placement plate (47). The two guide plates (41) are fixedly connected in the frame (1). The guide plates (41) are located on the left and right sides of the workbench (101). The transmission member (43) is fixedly connected to the left and right ends of the bottom of the rear end of the screen printing platform (2). The bottom of the moving member (43) is slidably connected to an anti-slip rod (44), the other end of the anti-slip rod (44) is slidably connected to a push rod (42), a sliding rod (45) is connected between the two push rods (42), a guide groove (411) is opened on the guide plate (41), the sliding rod (45) is slidably connected in the guide groove (411), both ends of the sliding rod (45) are connected to support rods (46), and a placement plate (47) is fixedly connected to the support rod (46), and the clamping mechanism (5) includes a fixed plate (51), a connecting rod (52), an upper clamping plate (53), a lower clamping plate (54), a guide rod (55), a fixing plate (56), an elastic member I (57), a connecting member (58) and a torsion spring (59), and the middle of the left and right sides of the placement plate (47) are A circular hole (48) is provided in each of the plurality of guide rods (55), a fixing plate (56) is rotatably connected in the circular hole (48), a guide rod (55) is slidably connected in the middle of the fixing plate (56), one end of the guide rod (55) is fixedly connected to a connecting rod (52), the middle of the left and right sides of the placement plate (47) are rotatably connected to the fixing plate (51), the guide rod (55) and the connecting rod (52) are both slidably connected to the fixing plate (51), the other end of the guide rod (55) is fixedly connected to a connecting piece (58), another fixing plate (56) is fixedly connected to the guide rod (55), an elastic piece I (57) is sleeved on the guide rod (55), the two ends of the elastic piece I (57) are respectively connected to the two fixing plates (56), the connecting rod (52) is slidably connected in the fixing plate (51), each Four upper clamping plates (53) are rotatably connected to a fixed plate (51) and are distributed on the front and rear sides. The upper clamping plates (53) are rotatably connected to the fixed plate (51) through a hinged rod. The end of the connecting rod (52) passes through the upper clamping plate (53). Each upper clamping plate (53) is hingedly connected to a lower clamping plate (54). The upper clamping plates (53) and the lower clamping plates (54) are respectively located at the upper and lower sides of the end of the connecting rod (52) and are pressed and matched with the connecting rod (52). A torsion spring (59) is provided on the upper clamping plate (53). One end of the torsion spring (59) is connected to the upper clamping plate (53), and the other end is connected to the lower clamping plate (54). An anti-collision groove (201) is opened at the bottom of the screen printing platform (2), and the anti-collision groove (201) is located directly above the upper clamping plate (53).

2. The automatic screen printer for PCB board according to claim 1, characterized in that: The mechanism (6) comprises a rotating rod (61), a rotating handle (62), a semi-spherical rod (63) and an elastic member II (64). The rotating rod (61) is rotatably connected to the circular hole (48). One end of the rotating rod (61) is connected to the connecting member (58), and the other end is slidably connected to the rotating handle (62). The other end of the rotating handle (62) is slidably connected to the semi-spherical rod (63). An elastic member II (64) is arranged in the rotating handle (62). One end of the elastic member II (64) is connected to the rotating handle (62), and the other end is connected to the semi-spherical rod (63). Circular grooves (49) are provided on both sides of the placement plate (47), and the semi-spherical rod (63) is engaged with the circular grooves (49).

3. The automatic screen printer for PCB boards according to claim 2, characterized in that: Also includes A support frame (7) and a support plate (71), wherein the support frame (7) is fixedly connected to the frame (1), the support plate (71) is connected to the support frame (7), and the support plate (71) is located below the placement plate (47).

4. The automatic screen printer for PCB boards according to claim 3, characterized in that: The invention also comprises an I-plate (8), a motor (81), a belt (82), a screw rod (83), a sliding frame (84), an inclined guide rail (85) and a top rod (86). The bottoms of the plurality of support rods (46) are commonly connected to the I-plate (8). Both ends of the I-plate (8) are rotatably connected to the screw rods (83). The bottoms of the two screw rods (83) are sleeved with belts (82). The motor (81) is mounted on the bottom of the I-plate (8). The bottom of one of the screw rods (83) is connected to the output shaft of the motor (81). The support rod (46) is connected to the inclined guide rail (85). The screw rod (83) is threadedly connected to the sliding frame (84). The sliding frame (84) is slidably connected to the support rod (46). The sliding frame (84) is rotatably connected to the top rod (86). The top rod (86) is slidably connected to the inclined guide rail (85).

5. The automatic screen printer for PCB boards according to claim 4, characterized in that: The invention also comprises a hollow top frame (9), a U plate (91), a sliding rod (92) and an elastic member III (93), wherein the U plate (91) is connected to the bottom of the placement plate (47), the hollow top frame (9) is slidably connected to the U plate (91), the bottom of the hollow top frame (9) is provided with an arc surface, which is pressed and matched with the sliding frame (84), the top of the hollow top frame (9) passes through the placement plate (47) and is pressed and matched with the connecting member (58), the middle of the hollow top frame (9) is connected with a sliding rod (92), the sliding rod (92) is sleeved with an elastic member III (93), one end of the elastic member III (93) is connected to the U plate (91), and the other end is connected to the hollow top frame (9).

6. The automatic screen printer for PCB boards according to claim 5, characterized in that: It also includes a rubber wheel (510), the ends of the upper clamping plate (53) and the lower clamping plate (54) are rotatably connected to the rubber wheel (510), and the top of the top rod (86) is rotatably connected to the rubber wheel (510).

7. The automatic screen printer for PCB boards according to claim 6, characterized in that: One end of the connecting piece (58) connected to the guide rod (55) is rounded, the top of the hollow top frame (9) is chamfered, and the top of the hollow top frame (9) is extruded and fitted with the connecting piece (58).

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