Three-color screen printing machine

Abstract

A three-color screen printing machine comprises an indexing rotary table and a plurality of machining stations arranged on the indexing rotary table, and product clamps are arranged at the positions, on the machining stations, of the indexing rotary table. The machining stations are sequentially a feeding station, a flame gun processing station, a visual inspection station, a first printing station, a first drying station, a second printing station, a second drying station, a third printing station, a third drying station and a discharging station, and feeding and discharging mechanical arms are arranged at the feeding station and the discharging station correspondingly. A flame gun processing device is arranged at the flame gun processing station, silk-screen printing devices are arranged at the first printing station, the second printing station and the third printing station correspondingly, LED drying devices are arranged at the first drying station, the second drying station and the third drying station correspondingly, and a feeding conveying belt is arranged in butt joint with the feeding station. A discharging conveying belt is arranged in butt joint with the discharging station. Three-color printing can be achieved through one device, the structure is compact, the cost is low, and the working efficiency is high.

Description

A three-color screen printing machine Technical Field

[0001] This utility model relates to the field of screen printing technology, and in particular to a three-color screen printing machine. Background Technology

[0002] Currently, most of the printing processes in the screen printing industry are still done manually, such as placing and aligning the screen printing stencil, printing, and drying. Bottles are manually placed one by one onto the screen printing machine, resulting in relatively low efficiency. Multiple screen printing machines are needed for mass production, leading to high costs and making it difficult to meet the development needs of small and medium-sized enterprises. Furthermore, existing screen printing methods often only support single-color printing; printing multiple colors requires multiple machines, which is often very expensive. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a three-color screen printing machine that can print three colors in one machine. It has a compact structure, low cost, and high working efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a three-color screen printing machine, including an indexing turntable and a plurality of processing stations set on the indexing turntable. Product fixtures are provided at the processing stations on the indexing turntable. According to the material processing sequence, the processing stations are sequentially a loading station, a torch processing station, a visual inspection station, a first printing station, a first drying station, a second printing station, a second drying station, a third printing station, a third drying station, and a unloading station. Loading and unloading robots are respectively provided at the loading and unloading stations. A torch processing device is provided at the torch processing station. Screen printing devices are respectively provided at the first, second, and third printing stations. LED drying devices are respectively provided at the first, second, and third drying stations. A loading conveyor belt is connected to the loading station, and an unloading conveyor belt is connected to the unloading station. This utility model operates on the following principle: A robotic arm picks up upright products from the feeding conveyor belt, moves them to the feeding station, and flips them to a horizontal position. At the feeding station, a product clamp holds the product tightly from front to back, and then transfers it to the torching station via an indexing turntable. The torching device sprays flames onto the product for torching treatment. During this process, the product clamp drives the product to rotate. The torching treatment improves surface adhesion and facilitates color application, ensuring that inks, coatings, or adhesives adhere firmly. After torching treatment, the product is transferred from the indexing turntable to the vision inspection station, where a vision inspection device checks whether the product surface is up to standard. After vision inspection, the product is transferred from the indexing turntable to the first printing station for the first color printing. After the first color printing is completed, the product is transferred from the indexing turntable to the first drying station for drying. After the first color is dried, the product is transferred from the indexing turntable to the second printing station for printing the second color. After the second color is printed, the product is transferred from the indexing turntable to the second drying station for drying. After the second color is dried, the product is transferred from the indexing turntable to the third printing station for printing the third color. After the third color is printed, the product is transferred from the indexing turntable to the third drying station for drying. After the third color is dried, the product is transferred from the indexing turntable to the unloading station and is picked up by the loading and unloading robot, and the product is transferred from the horizontal position in the product fixture to the upright position on the unloading conveyor belt.

[0005] As an improvement, the loading / unloading robot includes a first linkage mechanism, a second linkage mechanism, and a gripper mechanism; the first linkage mechanism includes a first motor, a first link, and a second link, with the output shaft of the first motor connected to one end of the first link, and the other end of the first link hinged to one end of the second link; the second linkage mechanism includes a second motor, a third link, and a fourth link, with the output shaft of the second motor connected to one end of the third link, and the other end of the third link hinged to one end of the fourth link; the gripper mechanism includes a mounting base, a third motor driving the mounting base to rotate, and a gripper cylinder fixed on the mounting base, the mounting base including a mounting... The mounting plate includes a first connecting plate at one end and a second connecting plate at the other end. The third motor is located between the first and second connecting plates and is fixed to a second connecting rod via a connector. The second connecting rod includes a first connecting arm and a second connecting arm arranged opposite to each other. The fourth connecting rod includes a third connecting arm and a fourth connecting arm arranged opposite to each other. The first connecting arm and the third connecting arm are rotatably connected via a first rotating shaft, which is connected to the output shaft of the third motor. The first rotating shaft passes through the first connecting plate. The second connecting arm and the fourth connecting arm are rotatably connected via a second rotating shaft, which passes through the second connecting plate.

[0006] As an improvement, the flame gun handling device includes an ignition mechanism, a lifting drive mechanism for driving the ignition mechanism to rise and fall, a smoke exhaust pipe located above the ignition mechanism, and a soot collection box located below the ignition mechanism; the ignition mechanism includes an ignition base, a gas pipe connected to the ignition base, end plates located at both ends of the ignition base, and a base plate located at the bottom of the ignition base. The ignition base, end plates, and base plate form a combustion chamber. One end of the gas pipe is fixedly connected to the top of the ignition base and communicates with the combustion chamber. The other end of the gas pipe is provided with a connector. The connector is provided with a gas inlet and an air inlet. The base plate is provided with several flame holes.

[0007] As an improvement, the lifting drive mechanism includes a vertically arranged rail, a sliding seat that slides with the rail, a nut connected to the sliding seat, a lead screw that engages with the nut, and a fourth motor that drives the lead screw. The rail is equipped with a limit switch that limits the travel of the sliding seat, and the sliding seat is connected to the gas pipe through a connector.

[0008] As an improvement, the screen printing device includes a screen printing head mechanism and a screen frame clamping mechanism for fixing the screen frame, a mounting plate, a first mounting plate mounted on the mounting plate via a first moving mechanism, a second mounting plate mounted on the first mounting plate via a second moving mechanism, and a third mounting plate mounted on the first mounting plate via a third moving mechanism. The screen printing head mechanism is mounted on the second mounting plate via a fourth moving mechanism, and the screen frame clamping mechanism is mounted on the third mounting plate via a fifth moving mechanism. The first moving mechanism drives the first mounting plate to move up and down, the second moving mechanism drives the second mounting plate to move left and right, and the third moving mechanism drives the third mounting plate to move left and right. The fourth moving mechanism includes a first cylinder facing downward and fixed on the second mounting plate, a transverse guide rod connected to the telescopic rod of the first cylinder, and a... The system comprises: a horizontal slider seat with a horizontal guide rod sliding engagement; a vertical guide rod engaging with the horizontal slider seat; a connecting plate connected to the vertical guide rod; a first adjusting screw pivotally connected to the horizontal slider seat and threadedly engaged with the connecting plate; and a second cylinder driving the horizontal slider seat to move. The fifth moving mechanism includes a crossbeam fixed to a third mounting plate, a second adjusting screw pivotally connected to the crossbeam, and two fixed seats engaging with the second adjusting screw. The screen frame clamp includes two clamping arms respectively fixed to the two fixed seats. The screen printing head mechanism includes an adjusting plate, a connecting seat, a squeegee, and a lifting cylinder fixed to the connecting seat and driving the squeegee to rise and fall. The top of the connecting seat is provided with an adjusting rod, and both ends of the adjusting rod are provided with adjusting bolts. The adjusting plate is provided with two arc-shaped grooves corresponding to the adjusting bolts, and the adjusting bolts pass through the arc-shaped grooves and are locked to the adjusting plate.

[0009] As an improvement, the first moving mechanism includes a fifth motor, a fifth lead screw connected to the output shaft of the fifth motor, and a fifth nut cooperating with the fifth lead screw. The fifth motor is fixed on a mounting plate, and the fifth nut is fixed on a first mounting plate. The mounting plate is provided with a fifth slide rail, and the first mounting plate is provided with a fifth slider that slidably engages with the fifth slide rail. The second moving mechanism includes a sixth slide rail fixed on the first mounting plate, a sixth slider that slidably engages with the sixth slide rail and is connected to a second mounting plate, a sixth motor, a sixth lead screw connected to the output shaft of the sixth motor, and a sixth nut cooperating with the sixth lead screw. The sixth nut is connected to the sixth slider. The third moving mechanism includes a seventh slide rail fixed on the second mounting plate, a seventh slider that slidably engages with the seventh slide rail and is connected to a third mounting plate, a seventh motor, a seventh lead screw connected to the output shaft of the seventh motor, and a seventh nut cooperating with the seventh lead screw. The seventh nut is connected to the seventh slider.

[0010] As an improvement, the two ends of the crossbeam are provided with pivot seats, and the two ends of the second adjusting screw are rotatably connected to the two pivot seats. The second adjusting screw is composed of two reverse threaded sections, and the rotation of the second adjusting screw drives the two fixed seats to move in opposite directions.

[0011] As an improvement, the product fixture includes a clamping base, a clamping mechanism for holding the product, a rotating mechanism for driving the product to rotate, and a buffer mechanism. The clamping mechanism includes two parallel and horizontally arranged guide rods, a first connecting plate disposed between the front ends of the two guide rods, a cone head pivotally connected to the middle position of the first connecting plate, a second connecting plate disposed between the two guide rods and parallel to the first connecting plate, and a clamping cylinder fixed on the clamping base and acting on the second connecting plate. The first connecting plate, the second connecting plate, and the two guide rods form a clamping station. The rear end of the guide rods slides in cooperation with the guide holes on the clamping base. The rotating mechanism includes a rotary motor fixed on the clamping base. The rotary motor is connected to a rotating shaft via a coupling. The front end of the rotating shaft extends into the clamping station and is aligned with the cone head. The buffer mechanism includes a distance sensor for detecting the distance to the second connecting plate and a buffer rod disposed on the clamping base and facing the second connecting plate. The distance sensor is connected to the rotary motor.

[0012] As an improvement, a blower mechanism is provided below the clamping station.

[0013] As an improvement, it also includes a housing, the indexing rotary table is located inside the housing, the loading conveyor belt and the unloading conveyor belt are located outside the housing, the housing includes a frame and an outer skin located outside the frame, and the housing is provided with maintenance access doors at the loading station, the torch processing station, the first printing station, the second printing station, the third printing station and the unloading station.

[0014] The beneficial effects of this utility model compared with the prior art are:

[0015] The loading robot, the torch processing device, the first screen printing device, the first LED drying device, the second screen printing device, the second LED drying device, the third screen printing device, the third LED drying device, and the unloading robot work together through an indexing turntable to achieve printing of three colors. The structure is compact, the cost is low, and the work efficiency is high. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the exterior of a three-color screen printing machine.

[0017] Figure 2 is a schematic diagram of the interior of a three-color screen printing machine.

[0018] Figure 3 is a 3D view of the loading and unloading robot.

[0019] Figure 4 is a side view of the loading and unloading robot.

[0020] Figure 5 is a side view of the musket handling device.

[0021] Figure 6 is a schematic diagram of the ignition mechanism.

[0022] Figure 7 is a three-dimensional view of the screen printing device.

[0023] Figure 8 is a schematic diagram of the screen printing head mechanism.

[0024] Figure 9 is a schematic diagram of the fifth moving mechanism of the screen printing device.

[0025] Figure 10 is a top view of the product fixture.

[0026] Figure 11 is a bottom view of the product fixture. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] As shown in Figures 1 and 2, a three-color screen printing machine includes a housing, an indexing turntable 8, and several processing stations arranged on the indexing turntable. Product clamps 9 are provided at each processing station on the indexing turntable 8. According to the material processing sequence, the processing stations are sequentially: a loading station, a torch processing station, a visual inspection station, a first printing station, a first drying station, a second printing station, a second drying station, a third printing station, a third drying station, and a unloading station. Loading and unloading robots 3 are respectively provided at the loading and unloading stations, a torch processing device 4 is provided at the torch processing station, and a visual inspection device 5 is provided at the visual inspection station. The first printing station, the second printing station, and the third printing station are each equipped with a screen printing device 6, and the first drying station, the second drying station, and the third drying station are each equipped with an LED drying device 7. A feeding conveyor belt 1 is connected to the feeding station, and a discharging conveyor belt 2 is connected to the discharging station. The indexing rotary table is located inside the outer shell, and the feeding conveyor belt and the discharging conveyor belt are located outside the outer shell. The outer shell includes a frame and an outer skin located outside the frame. The outer shell is equipped with maintenance access doors at the feeding station, the torch processing station, the first printing station, the second printing station, the third printing station, and the discharging station.

[0029] As shown in Figures 3 and 4, the loading / unloading robot 3 includes a first linkage mechanism, a second linkage mechanism, and a gripper mechanism. The first linkage mechanism includes a first motor 31, a first link 33, and a second link 34. The output shaft of the first motor 31 is connected to one end of the first link 33, and the other end of the first link 33 is hinged to one end of the second link 34. Weight-reducing holes are provided on the first link 33 and the second link 34. The second link 34 includes a first connecting arm and a second connecting arm arranged opposite each other. The second link 34 mechanism includes a second motor 32, a third link 35, and a fourth link 36. The output shaft of the second motor 32 is connected to one end of the third link 35, and the other end of the third link 35 is hinged to one end of the fourth link 36. Weight-reducing holes are provided on the third link 35 and the fourth link 36. The fourth link 36 includes a third connecting arm and a fourth connecting arm arranged opposite each other. The first motor 1 and the second motor 32 are fixed on the fixed base 37. The first motor 31 and the second motor 32 are at the same horizontal height and are arranged left and right. The first motor 31 drives the first link 33 mechanism, and the second motor 32 drives the second link 34 mechanism. The first link 33 mechanism and the second link 34 mechanism work together. The gripper mechanism includes a mounting plate 310, a third motor 38 that drives the mounting plate 310 to rotate, and a gripper cylinder 39 fixed on the mounting plate 310. The mounting plate 310 includes a mounting plate, a first connecting plate at one end of the mounting plate, and a second connecting plate at the other end of the mounting plate. The third motor 38 is located between the first connecting plate and the second connecting plate and is fixed to the second connecting rod 34 by a connector. The first connecting arm and the third connecting arm are rotatably connected by a first rotating shaft 311, which is connected to the output shaft of the third motor 38. The first rotating shaft 311 passes through the first connecting plate, and the third motor 38 drives the first rotating shaft to rotate. The first rotating shaft 311 drives the mounting plate 310 through the first connecting plate. The second connecting arm and the fourth connecting arm are rotatably connected by a second rotating shaft 312, which passes through the second connecting plate. The gripper cylinder 39 includes a cylinder body 391 and two symmetrically arranged grippers. The cylinder body 391 is fixed to the mounting plate, and the telescopic rods at both ends of the cylinder body 391 simultaneously drive the two grippers to open and close to achieve gripping. The gripper includes a crossbeam 392 and two claws 393 provided on the crossbeam 392. The crossbeam 392 is provided with an elongated hole along its length. The claws 393 are fixed to the elongated hole by bolts. The position of the two claws 393 can be adjusted according to the size of the bottle 313. The inner side of the claws 393 is provided with an arc-shaped groove to fit the bottle body.The loading / unloading robot at the loading station works as follows: The first linkage 33 and the second linkage 34 work together to drive the gripper mechanism to move forward and backward and up and down. After the gripper mechanism reaches the gripping position, the third motor 38 drives the gripper cylinder 39 to rotate 90°, at which point the gripper cylinder 39 can grip the bottle body of the self-standing bottle on the conveyor belt. After the gripper cylinder 39 grips the bottle, the first linkage 33 and the second linkage 34 work together to move the bottle to the loading station. Simultaneously, the third motor 38 drives the bottle to rotate 90° to a horizontal lying position, thus connecting the bottle to the next process device. Similarly, the loading / unloading robot at the unloading station can grip a horizontally lying bottle and rotate it to an upright position.

[0030] The firearm handling device 4 includes an ignition mechanism 41, a lifting drive mechanism 44 for driving the ignition mechanism 41 to rise and fall, a smoke exhaust pipe 42 located above the ignition mechanism 41, and an ash collection box 43 located below the ignition mechanism 41. The ignition mechanism 41 includes an ignition base 411, a gas pipe 412 connected to the ignition base 411, end plates 415 at both ends of the ignition base 411, and a base plate 416 at the bottom of the ignition base 411. The ignition base 411 is elongated, with openings at both ends and the bottom. The ignition base 411 includes a top plate and side plates on both sides. The inner side of the side plates is provided with a sliding groove. The two sides of the base plate 416 are provided with slide rails that cooperate with the sliding grooves. During disassembly, the end plates 415 are removed first, and then the base plate 416 is pulled out from one end of the ignition base 411. The inner end of the ignition base 411 is provided with an isolation cover 418 to protect other components of the screen printing machine. The base 411, end plate 415, and bottom plate 416 form a combustion chamber. One end of the gas pipe 412 is fixedly connected to the top of the ignition base 411 and communicates with the combustion chamber. The end plate at one end of the ignition base 411 is provided with an insertion port, through which the isolation plate 417 can be inserted into the combustion chamber to block the flame from being ejected from the nozzle. The gas pipe 412 is bent into an L-shape, and the other end of the gas pipe 412 is provided with a connector 414. The connector 414 is provided with a gas inlet and an air inlet, and the gas and air flow into the gas pipe 412 simultaneously through the connector 414. The bottom plate 416 is provided with a plurality of nozzles, which are arranged along the length of the bottom plate 416 in two rows, so that the flame is ejected evenly. The lifting drive mechanism 44 includes a vertically arranged rail, a sliding seat 442 that slides with the rail, a nut connected to the sliding seat 442, a lead screw that engages with the nut, and a fourth motor that drives the lead screw. The rail can be fixed on an aluminum alloy profile 45, and the installation height of the rail can be adjusted as needed. The rail is provided with a limit switch 441 that limits the travel of the sliding seat 442. The limit switch 441 can be a Hall sensor, which limits the highest and lowest positions of the ignition mechanism 41. The sliding seat 442 is connected to the gas pipe 412 through a connector 413. The connector 413 includes a first connecting plate and a second connecting plate. The first connecting plate is L-shaped, and the second connecting plate is straight. One end of the first connecting plate is connected to the sliding seat 442, and one end of the second connecting plate has an elongated hole that connects to the other end of the first connecting plate. The other end of the second connecting plate has a clamp that connects to the gas pipe 412.The principle of the flame treatment device: Air and gas are input into the ignition base 411 through the gas pipe 412, and then mixed and burned in the combustion chamber. The flame generated by the combustion is used to treat the product below through the flame nozzle. The ignition base 411 is detachable for easy and quick maintenance. The height of the ignition mechanism can be adjusted by the lifting drive mechanism, and the flame height is precisely controllable. There is an ash collection box below the ignition mechanism. The ash generated by the combustion automatically falls into the ash collection box below, which facilitates the centralized treatment of the ash.

[0031] The visual inspection device 5 typically includes an inspection bracket and a CCD camera. The LED drying device 7 includes a drying bracket and LED lights.

[0032] As shown in Figures 6 to 9, the screen printing device 6 includes a screen printing head mechanism 69, a screen frame clamping mechanism 68 for fixing the screen frame, a mounting plate 61, a first mounting plate 63 mounted on the mounting plate 61 via a first moving mechanism 62, a second mounting plate 661 mounted on the first mounting plate 63 via a second moving mechanism 64, and a third mounting plate 671 mounted on the first mounting plate 63 via a third moving mechanism 65; the screen printing head mechanism 69 is mounted on the second mounting plate 661 via a fourth moving mechanism 66, and the screen frame clamping mechanism 68 is mounted on the third mounting plate 671 via a fifth moving mechanism 67; the first moving mechanism 62 drives the first mounting plate 63 to move up and down, the second moving mechanism 64 drives the second mounting plate 661 to move left and right, and the third moving mechanism 65 drives the third mounting plate 671 to move left and right. The first moving mechanism 62 includes a fifth motor, a fifth lead screw connected to the output shaft of the fifth motor, and a fifth nut cooperating with the fifth lead screw. The fifth motor is fixed on a mounting plate 61, and the fifth nut is fixed on a first mounting plate 63. The mounting plate 61 is provided with a fifth slide rail, and the first mounting plate 63 is provided with a fifth slider that slidably engages with the fifth slide rail. The second moving mechanism 64 includes a sixth slide rail fixed on the first mounting plate 63, a sixth slider that slidably engages with the sixth slide rail and is connected to a second mounting plate 661, a sixth motor, a sixth lead screw connected to the output shaft of the sixth motor, and a sixth nut cooperating with the sixth lead screw. The sixth nut is connected to the sixth slider, and the sixth slide rail is perpendicular to the fifth slide rail. The third moving mechanism 65 includes a seventh slide rail fixed on the second mounting plate 661, a seventh slider that slidably engages with the seventh slide rail and is connected to a third mounting plate 671, a seventh motor, a seventh lead screw connected to the output shaft of the seventh motor, and a seventh nut cooperating with the seventh lead screw. The seventh nut is connected to the seventh slider, and the seventh slide rail is located below the sixth slide rail and the two are arranged parallel to each other. The fourth moving mechanism 66 includes a first cylinder 662 disposed downwards and fixed on the second mounting plate 661, a transverse guide rod 665 connected to the telescopic rod of the first cylinder 662, a transverse slider seat 664 slidably engaged with the transverse guide rod 665, a vertical guide rod 668 slidably engaged with the transverse slider seat 664, a connecting plate 666 connected to the upper end of the vertical guide rod 668, a first adjusting screw 663 pivotally connected to the transverse slider seat 664 and threadedly engaged with the connecting plate 666, and a second cylinder 667 driving the transverse slider seat 664. The cylinder body of the second cylinder 667 is fixed on the transverse slider seat 664, and the telescopic rod of the second cylinder 667 is connected to the transverse guide rod 665.The screen printing head mechanism 69 includes an adjusting plate 691, a connecting seat 692, a squeegee 694, and a lifting cylinder 693 fixed on the connecting seat 692 and driving the squeegee 694 to rise and fall. The top of the connecting seat 692 is provided with an adjusting rod 695, and both ends of the adjusting rod 695 are provided with adjusting bolts. The adjusting plate 691 is connected to the lower end of the vertical guide rod 668. The adjusting plate 691 is provided with two arc-shaped grooves 6911 corresponding to the adjusting bolts. The adjusting bolts pass through the arc-shaped grooves 6911 and are locked to the adjusting plate. After the adjusting bolts are loosened, the connecting seat 692 can be rotated to adjust the angle of the squeegee 694. The fifth moving mechanism 67 includes a crossbeam 672 fixed on the third mounting plate 671, a second adjusting screw 673 pivotally connected to the crossbeam 672, and two fixed seats 674 cooperating with the second adjusting screw 673; the mesh frame clamp includes two clamping arms 681 respectively fixed on the two fixed seats 674, and the clamping arms 681 have the function of adjusting up and down and forward and backward; the two ends of the crossbeam 672 are provided with pivot seats 675, and the two ends of the second adjusting screw 673 are rotatably connected to the two pivot seats 675, and the second adjusting screw 673 can only rotate in place; the second adjusting screw 673 is composed of two reverse threaded sections, and the rotation of the second adjusting screw 673 drives the two fixed seats 674 to move in opposite directions along the crossbeam 672, that is, to move closer or further away from each other, and the distance between the two clamping arms 681 is adjusted by the second adjusting screw 673. The screen printing device operates as follows: The first moving mechanism 62 drives the screen printing head mechanism 69 and the screen frame clamping mechanism 68 to move up and down together; the second moving mechanism 64 drives the screen printing head mechanism 69 to move left and right; the third moving mechanism 65 drives the screen frame clamping mechanism 68 to move left and right; the fourth moving mechanism 66 adjusts the initial position and lifting movement of the screen printing head mechanism 69 to cooperate with the screen frame below to complete the screen printing process; and the fifth moving mechanism 67 adjusts the distance between the two clamping arms 681 to accommodate screen frames of different sizes. All of the above motors are servo motors, and the screen printing action is completed at high speed by controlling each motor.

[0033] As shown in Figures 10 and 11, the product fixture 9 includes a clamping base 99, a clamping mechanism for holding the product, a rotating mechanism for driving the product to rotate, and a buffer mechanism. The clamping mechanism includes two parallel and horizontally arranged guide rods 93, a first connecting plate 91 located between the front ends of the two guide rods 93, a cone head 92 pivotally connected to the middle position of the first connecting plate 91, a second connecting plate 97 located between the two guide rods 93 and parallel to the first connecting plate 91, and a clamping cylinder 912 fixed on the clamping seat 99 and acting on the second connecting plate 97. The first connecting plate 91, the second connecting plate 97, and the two guide rods 93 form a clamping station. After the loading robot places the product into the clamping station, the product clamping fixture clamps it. The rear end of the guide rod 93 slides into the guide hole on the clamping seat 99. The clamping cylinder 912 drives the two guide rods 93 through the second connecting plate 97. The guide rods 93 drive the first connecting plate 91, and the first connecting plate 91 drives the cone head 92. The cone head 92 includes a rubber head, a mandrel, and a bearing seat. The bearing seat is fixed on the first connecting plate 91, and the rubber head is pivotally connected to the bearing seat through the mandrel. The cone head 92 can rotate freely. The rotating mechanism includes a rotary motor 910 fixed on a clamping base 99. The rotary motor 910 is connected to a rotating shaft 96 via a coupling. The front end of the rotating shaft 96 extends into the clamping station and aligns with the cone head 92. A tray 95 is provided at the front end of the rotating shaft 96. The tray 95 is connected to the rotating shaft 96 by screws. The tray 95 can be replaced according to different product shapes. The tray 95 has a large contact area with the product, and the rotating shaft 96 can drive the product to rotate through the tray 95. The buffering mechanism includes a distance sensor 98 for detecting the distance to the second connecting plate 97 and a buffer rod 911 disposed on the clamping base 99 and facing the second connecting plate 97. The distance sensor 98 is connected to the rotary motor 910. When the product is clamped by the cone head 92 and the rotating shaft 96, the second connecting plate 97 is in its extreme position. At this time, the distance sensor 98 can sense the second connecting plate 97 and output a command to the rotary motor 910. The clamp 99 includes a mounting part and guide parts located on both sides of the mounting part. The guide parts are equipped with linear bearings that cooperate with guide rods 93. The bottom of the mounting part has a receiving cavity. The coupling, clamping cylinder 912, and buffer rod are located within the receiving cavity. The bottom of the clamp 99 can be fixed to the turntable by a positioning pin. A blower mechanism 912 is located below the clamping station. The blower mechanism 912 blows air upwards in conjunction with the product's rotation, blowing away dust from the product surface. Product clamping principle: Clamping stage: The clamping cylinder 912 pushes the second connecting plate 97 backwards, and the guide rod 93 drives the first connecting plate 91 backwards to close, clamping the product by the cone head 92 and the rotating shaft 96; Product rotation: After the distance sensor detects that the second connecting plate 97 is in place, the rotary motor 910 starts. The rotary motor 910 drives the product to rotate via the rotating shaft 6. The rotation process can achieve dust removal or printing on the product surface.

[0034] This utility model operates on the following principle: A robotic arm picks up upright products from the feeding conveyor belt, moves them to the feeding station, and flips them to a horizontal position. At the feeding station, a product clamp holds the product tightly from front to back, and then transfers it to the torching station via an indexing turntable. The torching device sprays flames onto the product for torching treatment. During this process, the product clamp drives the product to rotate. The torching treatment improves surface adhesion and facilitates color application, ensuring that inks, coatings, or adhesives adhere firmly. After torching treatment, the product is transferred from the indexing turntable to the vision inspection station, where a vision inspection device checks whether the product surface is up to standard. After vision inspection, the product is transferred from the indexing turntable to the first printing station for the first color printing. After the first color printing is completed, the product is transferred from the indexing turntable to the first drying station for drying. After the first color is dried, the product is transferred from the indexing turntable to the second printing station for printing the second color. After the second color is printed, the product is transferred from the indexing turntable to the second drying station for drying. After the second color is dried, the product is transferred from the indexing turntable to the third printing station for printing the third color. After the third color is printed, the product is transferred from the indexing turntable to the third drying station for drying. After the third color is dried, the product is transferred from the indexing turntable to the unloading station and is picked up by the loading and unloading robot, and the product is transferred from the horizontal position in the product fixture to the upright position on the unloading conveyor belt.

Claims

1. A three-color screen printing machine, comprising an indexing turntable and a plurality of processing stations disposed on the indexing turntable, wherein product fixtures are provided on the indexing turntable at the processing stations, characterized in that: According to the material processing sequence, the processing stations are, in order, a loading station, a torch processing station, a visual inspection station, a first printing station, a first drying station, a second printing station, a second drying station, a third printing station, a third drying station, and a unloading station. The loading and unloading stations are equipped with loading and unloading robots, the torch processing station is equipped with a torch processing device, the first printing station, the second printing station, and the third printing station are equipped with screen printing devices, and the first drying station, the second drying station, and the third drying station are equipped with LED drying devices. A loading conveyor belt is connected to the loading station, and an unloading conveyor belt is connected to the unloading station.

2. A three-color screen printing machine according to claim 1, characterized in that: The loading / unloading robot includes a first linkage mechanism, a second linkage mechanism, and a gripper mechanism. The first linkage mechanism includes a first motor, a first link, and a second link. The output shaft of the first motor is connected to one end of the first link, and the other end of the first link is hinged to one end of the second link. The second linkage mechanism includes a second motor, a third link, and a fourth link. The output shaft of the second motor is connected to one end of the third link, and the other end of the third link is hinged to one end of the fourth link. The gripper mechanism includes a mounting base, a third motor driving the mounting base to rotate, and a gripper cylinder fixed to the mounting base. The mounting base includes a mounting plate. A first connecting plate is located at one end of the mounting plate, and a second connecting plate is located at the other end of the mounting plate. The third motor is located between the first and second connecting plates and is fixed to the second connecting rod by a connector. The second connecting rod includes a first connecting arm and a second connecting arm arranged opposite to each other. The fourth connecting rod includes a third connecting arm and a fourth connecting arm arranged opposite to each other. The first connecting arm and the third connecting arm are rotatably connected by a first rotating shaft. The first rotating shaft is connected to the output shaft of the third motor and passes through the first connecting plate. The second connecting arm and the fourth connecting arm are rotatably connected by a second rotating shaft and pass through the second connecting plate.

3. A three-color screen printing machine according to claim 1, characterized in that: The flame gun handling device includes an ignition mechanism, a lifting drive mechanism for driving the ignition mechanism to rise and fall, a smoke exhaust pipe located above the ignition mechanism, and a soot collection box located below the ignition mechanism. The ignition mechanism includes an ignition base, a gas pipe connected to the ignition base, end plates located at both ends of the ignition base, and a base plate located at the bottom of the ignition base. The ignition base, end plates, and base plate form a combustion chamber. One end of the gas pipe is fixedly connected to the top of the ignition base and communicates with the combustion chamber. The other end of the gas pipe is provided with a connector. The connector is provided with a gas inlet and an air inlet. The base plate is provided with several flame holes.

4. A three-color screen printing machine according to claim 3, characterized in that: The lifting drive mechanism includes a vertically arranged rail, a sliding seat that slides with the rail, a nut connected to the sliding seat, a lead screw that engages with the nut, and a fourth motor that drives the lead screw. The rail is equipped with a limit switch that limits the travel of the sliding seat. The sliding seat is connected to a gas pipe through a connector.

5. A three-color screen printing machine according to claim 1, characterized in that: The screen printing device includes a screen printing head mechanism, a screen frame clamping mechanism for fixing the screen frame, a mounting plate, a first mounting plate mounted on the mounting plate via a first moving mechanism, a second mounting plate mounted on the first mounting plate via a second moving mechanism, and a third mounting plate mounted on the first mounting plate via a third moving mechanism. The screen printing head mechanism is mounted on the second mounting plate via a fourth moving mechanism, and the screen frame clamping mechanism is mounted on the third mounting plate via a fifth moving mechanism. The first moving mechanism drives the first mounting plate to move up and down, the second moving mechanism drives the second mounting plate to move left and right, and the third moving mechanism drives the third mounting plate to move left and right. The fourth moving mechanism includes a first cylinder facing downward and fixed on the second mounting plate, a transverse guide rod connected to the telescopic rod of the first cylinder, and a transverse guide rod connected to the telescopic rod of the first cylinder. The system comprises: a horizontal slider seat with sliding engagement with the rod; a vertical guide rod that engages with the horizontal slider seat; a connecting plate connected to the vertical guide rod; a first adjusting screw pivotally connected to the horizontal slider seat and threadedly engaged with the connecting plate; and a second cylinder that drives the horizontal slider seat to move. The fifth moving mechanism includes a crossbeam fixed to a third mounting plate, a second adjusting screw pivotally connected to the crossbeam, and two fixed seats that engage with the second adjusting screw. The screen frame clamp includes two clamping arms respectively fixed to the two fixed seats. The screen printing head mechanism includes an adjusting plate, a connecting seat, a squeegee, and a lifting cylinder fixed to the connecting seat and driving the squeegee to rise and fall. The top of the connecting seat is provided with an adjusting rod, and both ends of the adjusting rod are provided with adjusting bolts. The adjusting plate is provided with two arc-shaped grooves corresponding to the adjusting bolts, and the adjusting bolts pass through the arc-shaped grooves and are locked to the adjusting plate.

6. A three-color screen printing machine according to claim 5, characterized in that: The first moving mechanism includes a fifth motor, a fifth lead screw connected to the output shaft of the fifth motor, and a fifth nut cooperating with the fifth lead screw. The fifth motor is fixed on a mounting plate, and the fifth nut is fixed on a first mounting plate. The mounting plate is provided with a fifth slide rail, and the first mounting plate is provided with a fifth slider that slidably engages with the fifth slide rail. The second moving mechanism includes a sixth slide rail fixed on the first mounting plate, a sixth slider that slidably engages with the sixth slide rail and is connected to a second mounting plate, a sixth motor, a sixth lead screw connected to the output shaft of the sixth motor, and a sixth nut cooperating with the sixth lead screw. The sixth nut is connected to the sixth slider. The third moving mechanism includes a seventh slide rail fixed on the second mounting plate, a seventh slider that slidably engages with the seventh slide rail and is connected to a third mounting plate, a seventh motor, a seventh lead screw connected to the output shaft of the seventh motor, and a seventh nut cooperating with the seventh lead screw. The seventh nut is connected to the seventh slider.

7. A three-color screen printing machine according to claim 5, characterized in that: The two ends of the crossbeam are provided with pivot seats, and the two ends of the second adjusting screw are rotatably connected to the two pivot seats. The second adjusting screw is composed of two reverse threaded sections, and the rotation of the second adjusting screw drives the two fixed seats to move in opposite directions.

8. A three-color screen printing machine according to claim 1, characterized in that: The product fixture includes a clamping base, a clamping mechanism for holding the product, a rotating mechanism for driving the product to rotate, and a buffer mechanism. The clamping mechanism includes two parallel and horizontally arranged guide rods, a first connecting plate located between the front ends of the two guide rods, a cone head pivotally connected to the middle position of the first connecting plate, a second connecting plate located between the two guide rods and parallel to the first connecting plate, and a clamping cylinder fixed on the clamping base and acting on the second connecting plate. The first connecting plate, the second connecting plate, and the two guide rods form a clamping station. The rear ends of the guide rods slide in cooperation with guide holes on the clamping base. The rotating mechanism includes a rotary motor fixed on the clamping base. The rotary motor is connected to a rotating shaft via a coupling. The front end of the rotating shaft extends into the clamping station and is aligned with the cone head. The buffer mechanism includes a distance sensor for detecting the distance to the second connecting plate and a buffer rod located on the clamping base and facing the second connecting plate. The distance sensor is connected to the rotary motor.

9. A three-color screen printing machine according to claim 8, characterized in that: A blower mechanism is provided below the clamping station.

10. A three-color screen printing machine according to claim 1, characterized in that: It also includes an outer shell, the indexing turntable is located inside the outer shell, the feeding conveyor belt and the unloading conveyor belt are located outside the outer shell, the outer shell includes a frame and an outer skin located outside the frame, and the outer shell is provided with maintenance access doors at the feeding station, the torch processing station, the first printing station, the second printing station, the third printing station and the unloading station.

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