A two-color steel drum silk printing method

Abstract

The present application relates to steel drum silk screen printing technical field, disclose a kind of double-color steel drum silk screen printing method, including conveying frame, lifting workbench is equipped in conveying frame, still include mouth searching positioning assembly and printing assembly, conveying frame is equipped with mounting bracket, printing assembly is located at one end of mounting bracket, printing assembly includes guide rail, printing frame, first driving part and two groups of printing parts, guide rail is located at one end of mounting bracket, printing frame is located in mounting bracket, first printing area and second printing area are opened in printing frame, first driving part is located between mounting bracket and printing frame, two groups of printing parts are located at one end of guide rail, each printing part can be abutted with printing frame;Different articles are printed on the same axial direction of the outer wall of steel drum by printing assembly, which simplifies the steps of steel drum printing, and the printing frame is continuously moved by one end distance, so that the pigment accumulated at the lower end of the printing part is moved to the path of the next printing, thereby avoiding the pigment of printing always located at both ends of the printing path.

Description

Technical Field

[0001] This invention relates to the field of screen printing technology for steel drums, and specifically to a two-color screen printing method for steel drums. Background Technology

[0002] Steel drums, as efficient packaging containers, are widely used for the transportation and storage of liquids, solids, and semi-solids. Existing steel drums typically have a large opening and a small opening. The large opening is primarily used for quick loading and unloading of materials, cleaning, and maintenance; it is the main operating port. The small opening is mainly used for auxiliary venting, controlling material flow rate, or installing accessories; it is an auxiliary functional port. Before use, labels are often printed on the outer wall of the steel drum to identify its contents. Currently, screen printing is the main technology for printing on the outer wall of steel drums.

[0003] The prior art discloses (Publication No.: CN100577420C) an automatic multi-color screen printing machine for steel drums. Its key technical features include conveying devices fixed at the front and rear ends of the printing frame, a printing mechanism located directly above the frame, a positioning gear device fixed at the rear of the frame, a lifting worktable fixed below the frame, and a drying device located directly above the rear conveyor frame. With this structure, the steel drum is conveyed from the front conveyor frame to the printing position. The lifting worktable lifts the drum, and after the positioning cylinder locates the oil filling port and secures the drum body to the large gear, it is driven by the same cylinder to complete the printing process, synchronizing the screen movement with the drum body rotation. This ensures the accuracy of multi-color registration. The advantages of this invention include good registration accuracy, stable color, fast production speed, and suitability for industrial production.

[0004] However, existing technology can only print multiple colors on different axes of the same steel drum, but cannot print different colors or different text on the same axis of the steel drum. This requires the steel drum to be printed twice in order to achieve printing different colors or different text on the same axis, which greatly reduces the efficiency of steel drum printing. To address this problem, we propose a two-color steel drum screen printing method. Summary of the Invention

[0005] The present invention aims to provide a two-color screen printing method for steel drums. Existing technology can only print multiple colors on different axes of the same steel drum, which requires the steel drum to be printed twice in order to print different colors or different text on the same axis, greatly reducing the printing efficiency of steel drums.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a two-color steel drum screen printing method, comprising a conveyor frame, a lifting worktable inside the conveyor frame, a positioning component, and a printing component. A mounting frame is located at one end of the conveyor frame, and the printing component is located at one end of the mounting frame. The printing component includes a guide rail, a printing frame, a first driving component, and two sets of printing components. The guide rail is located at one end of the mounting frame, the printing frame is located inside the mounting frame, and the printing frame has a first printing area and a second printing area. The first driving component is located between the mounting frame and the printing frame. The two sets of printing components are located at one end of the guide rail, and each printing component can abut against the printing frame. The two-color steel drum screen printing method includes the following steps:

[0007] Step 1: The first group of printed parts and the second group of printed parts are located at the starting positions of the first printing area and the second printing area, respectively, and the first group of printed parts is located above the lifting worktable.

[0008] Step 2: The conveyor belt transports the steel drum to the top of the positioning component, adjusts the steel drum to the designated position, and then transports it to the lifting worktable.

[0009] Step 3: The lifting platform raises the steel barrel so that it abuts against the printing frame, and the first set of printed parts abuts against the starting position of the first printing area;

[0010] Step 4: The first driving component drives the printing frame to move, and the first group of printed parts is relatively stationary with respect to the steel barrel. The second group of printed parts moves synchronously with the printing frame and remains relatively stationary.

[0011] Step 5: When the end of the first printing area moves to below the first group of printed parts, the first group of printed parts separates from the first printing area and moves along the direction of the printing frame.

[0012] Step 6: When the second set of printed parts moves above the steel drum, the second set of printed parts comes into contact with the starting position of the second printing area;

[0013] Step 7: When the end of the second printing area moves to below the second group of printed parts, the second group of printed parts separates from the second printing area, and the first group of printed parts stops moving.

[0014] Step 8: After the first set of printed parts stops moving, the printing frame continues to move 5-10cm and then stops.

[0015] Step 9: The printing assembly operates in reverse order to print on the next steel drum.

[0016] The beneficial effects of this solution are as follows: The positioning component adjusts the steel drums to the same printing position, preventing inconsistencies in the text placement between drums during subsequent printing, which would affect the drums' appearance. By creating a first and second printing area within the printing frame, different text or colors can be set in these areas respectively. Corresponding printed parts abut against the printing frame, allowing the moving printing frame to print the complete text onto the outer wall of the steel drum under the action of the printed parts. The mounting frame is used to install the printing components, and the lifting worktable is used to lift the steel drum to be printed, causing it to abut against the lower end of the printing frame. The first driving component drives the printing frame to reciprocate. When the printing frame moves, it rotates the steel drum it abuts against, which, combined with the stationary printed parts scraping the ink within the printing frame, ensures accurate printing. The text within the frame is evenly printed on the outer wall of the steel drum. After the first set of printed parts prints the text of the first printing area onto the outer wall of the steel drum, the first set of printed parts separates from the first printing area and moves together with the printing frame, thus leaving the printing station. When the second set of printed parts moves to the printing station, the second set of printed parts stops moving and comes into contact with the second printing area, thus printing the text of the second printing area onto the outer wall of the steel drum. After the second set of printed parts finishes printing the text of the second printing area, it separates from the second printing area, thus completing the printing of two different texts or colors on the same axis of the steel drum, simplifying the steel drum printing process. At the same time, the printing frame continues to move a certain distance, allowing the ink accumulated at the bottom of the printed parts to move into the path of the next printing, thus avoiding the ink being always located at both ends of the printing path, which would lead to ink waste.

[0017] Preferably, as an improvement, the orifice positioning component includes a lifting platform, a rotating rod, a drive motor, and a sensor. The lifting platform is located inside the conveyor frame, the drive motor is located at one end of the conveyor frame, the rotating rod is located at the output end of the drive motor, and the other end of the rotating rod is rotatably connected to the conveyor frame. The outer wall of the rotating rod is symmetrically provided with pressure rollers, and the pressure rollers can abut against the outer wall of the steel drum. The sensor is located at the end of the conveyor frame near the opening of the steel drum, and the sensor can identify the large opening of the steel drum.

[0018] The beneficial effects are as follows: The lifting platform is used to lift the steel drum, so that the steel drum comes into contact with the pressure rollers on the outer wall of the rotating rod. The drive motor is used to drive the rotating rod to rotate, which in turn drives the pressure rollers symmetrically arranged on the outer wall of the rotating rod to rotate, and then drives the steel drum to rotate. When the large opening of the steel drum rotates to the front end of the sensor, the sensor recognizes the large opening and transmits an electrical signal to the drive motor, thereby controlling the drive motor to stop rotating, and thus adjusting the large opening of the steel drum to a uniform position, which facilitates subsequent printing and improves the printing effect of the steel drum.

[0019] Preferably, as an improvement, the first driving component includes a first motor, a first gear, and a first rack. The first motor is located at one end of the mounting bracket, the first gear is located at the output end of the first motor, and the first rack is located at the end of the printing frame near the guide rail, and the first gear meshes with the first rack.

[0020] The beneficial effect is that by setting the first rack at one end of the printing frame near the mounting frame, and cooperating with the first gear at the output end of the first motor, the printing frame can be moved by starting the motor.

[0021] Preferably, as an improvement, the printed part includes a slider, a second driving member, a connecting block, a cylinder, and a scraper. The slider is located at the end of the guide rail away from the mounting frame. The second driving member is located between the slider and the guide rail and enables the slider to move on the guide rail. The connecting block is located at the end of the slider near the conveyor frame. The cylinder is located at one end of the connecting block. The scraper is located at the output end of the cylinder, and each scraper can abut against the corresponding first printing area and second printing area.

[0022] The beneficial effects are as follows: the second driving component is used for the slider to move on the upper end of the guide rail, the connecting block is used to install the cylinder, the cylinder is used to control the extension and retraction of the scraper, and the scraper is used to push the printing ink evenly across the printing frame, thereby printing the text in the printing frame onto the outer wall of the steel drum.

[0023] Preferably, as an improvement, the second driving component includes a second motor, a second gear, and a second rack. The second motor is located at the end of the slider away from the guide rail, and the output end of the second motor passes through the slider. The second gear is located at the output end of the second motor, and the second rack is located on the inner wall of the guide rail, and the second gear meshes with the second rack.

[0024] The beneficial effect is that by starting the second motor, the second gear is driven to rotate, thereby causing the second gear to move along the second rack that meshes with it, and thus driving the slider to move on the outer wall of the guide rail.

[0025] Preferably, as an improvement, the printing frame is provided with pressure strips symmetrically at one end near the conveyor frame, and the pressure strips can abut against the edge of the steel barrel, and several springs are provided between the pressure strips and the printing frame.

[0026] The beneficial effects are as follows: by setting a pressure strip at the lower end of the printing frame, the friction between the printing frame and the steel barrel is increased, preventing the steel barrel from slipping and causing misprints. By setting several springs between the pressure strip and the printing frame, not only can the impact force on the printing frame when the steel barrel and the pressure strip come into contact be reduced, but the pressure strip can also make the contact between the pressure strip and the edge of the steel barrel more tight, further preventing the steel barrel from slipping.

[0027] Preferably, as an improvement, the slider is U-shaped, with the opening of the slider facing the end closest to the printing frame, and through slots are symmetrically opened on the sidewall of the slider.

[0028] The beneficial effects are as follows: by setting the slider to a U-shape, the slider is partially wrapped around the outer wall of the guide rail, which increases the stability of the slider when it moves. By opening through grooves on the side wall of the slider, the weight of the slider can be reduced, and the wear between the second gear and the second rack can be reduced. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the printing component according to an embodiment of the present invention;

[0030] Figure 2 This is a partial cross-sectional view of the printing frame according to an embodiment of the present invention;

[0031] Figure 3 This is a three-dimensional structural diagram of the printed part according to an embodiment of the present invention;

[0032] Figure 4 This is a top view of the flipping component and the pushing component according to an embodiment of the present invention;

[0033] Figure 5 This is a side view of the flipping component according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the main structure of the port positioning component according to an embodiment of the present invention;

[0035] Figure 7 This is a side view of the positioning component according to an embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram of the printing frame moving to the left in an embodiment of the present invention;

[0037] Figure 9 This is a schematic diagram of the printing frame moving to the right in an embodiment of the present invention. Detailed Implementation

[0038] The following detailed description illustrates the specific implementation method:

[0039] The reference numerals in the accompanying drawings include: mounting bracket 1, guide rail 2, printing frame 3, first printing area 4, second printing area 5, slider 6, connecting block 7, cylinder 8, scraper 9, first motor 12, first gear 13, first rack 14, second motor 15, pressure bar 16, connector 17, spring 18, through groove 19, steel barrel 20, conveyor frame 21, lifting worktable 22, tilting frame 23, rotating shaft 24, tilting block 25, short rotating shaft 26, long rotating shaft 27, support rod 28, column 29, pushing cylinder 30, push rod 31, lifting platform 32, rotating rod 33, drive motor 34, sensor 35, pressure roller 36, large opening 37, small opening 38.

[0040] Example

[0041] The basic implementation examples are as follows: Figures 1-9 As shown, a two-color steel drum screen printing method includes a conveyor frame 21 for conveying steel drums 20. A lifting worktable 22 is provided between the conveyor frames 21 and is fixedly installed on the ground. The method also includes a positioning assembly, a printing assembly, and two sets of tilting assemblies. The tilting assemblies are located at both ends of the conveyor frame 21 and are used to change the transport posture of the steel drums 20. Figure 1 As shown, a mounting frame 1 is fixedly installed on the upper end of the conveyor frame 21. The printing assembly is mounted on the mounting frame 1. The printing assembly includes a guide rail 2, a printing frame 3, a first drive component, and two sets of printing parts. The guide rail 2 is fixedly installed on the upper end of the mounting frame 1. The front and rear inner walls of the mounting frame 1 are symmetrically provided with sliding grooves. The printing frame 3 is slidably installed in the sliding grooves. Figure 2 The printing frame 3 shown has several connectors 17 symmetrically slidably mounted on its front and rear sides. Limit blocks are fixedly mounted on the upper ends of the connectors 17. Pressure strips 16 are fixedly mounted on the lower ends of the connectors 17 on the same side, and these pressure strips 16 can abut against the edge of the steel barrel 20. The pressure strips 16 are made of elastic rubber material. Several springs 18 are provided between the pressure strips 16 and the printing frame 3, and each spring 18 is sleeved on the outer wall of each connector 17. The printing frame 3 has a first printing area 4 and a second printing area sequentially opened from left to right. 5. The first driving component is located between the mounting frame 1 and the printing frame 3. The first driving component includes a first motor 12, a first gear 13 and a first rack 14. The first motor 12 is fixedly installed on the upper rear side of the mounting frame 1. The first motor 12 is a servo motor. The first gear 13 is fixedly installed on the output end of the first motor 12. The first rack 14 is fixedly installed on the upper rear side of the printing frame 3, and the first gear 13 meshes with the first rack 14. The first driving component can drive the printing frame 3 to reciprocate within the mounting frame 1.

[0042] Two sets of printed parts are symmetrically arranged at one end of the guide rail 2 away from the conveyor frame 21, such as... Figure 1 and Figure 3The printed component shown includes a slider 6, a second driving component, a connecting block 7, a cylinder 8, and a scraper 9. The slider 6 is slidably mounted on the upper end of the guide rail 2. The slider 6 is U-shaped, with its opening facing downwards and encased in the outer wall of the guide rail 2. Several through slots 19 are symmetrically opened on the side wall of the slider 6. The second driving component is located between the slider 6 and the guide rail 2. The second driving component includes a second motor 15, a second gear, and a second rack. The second motor 15 is fixedly mounted on the upper end of the slider 6, and its output end extends through the slider 6 to the space between the slider 6 and the guide rail 2. The second motor 15 can... The second gear is fixedly installed on the output end of the second motor 15, and the second rack is fixedly installed on the inner wall of the guide rail 2. The second gear meshes with the second rack. The second driving component can drive the slider 6 to move on the guide rail 2. The connecting block 7 is fixedly installed on the lower end of the slider 6. The cylinder 8 is fixedly installed on the end of the connecting block 7 away from the second motor 15, so that the cylinder 8 and the second motor 15 are not located on the same side of the slider 6. The scraper 9 is fixedly installed on the output end of the cylinder 8, and each scraper 9 can abut against the corresponding first printing area 4 and second printing area 5.

[0043] like Figure 4 and Figure 5 Both sets of flipping components shown include a flipping frame 23, a rotating shaft 24, a flipping block 25, and several short rotating shafts 26 and long rotating shafts 27. The two flipping frames 23 are located at the input and output ends of the conveyor frame 21, respectively, and the transport direction of the flipping frames 23 is perpendicular to the transport direction of the conveyor frame 21. Figure 4The rotating shaft 24 shown is rotatably mounted between the inner walls of the left end of the tilting frame 23, and a servo motor for driving the rotating shaft 24 is fixedly mounted inside the tilting frame 23. The tilting block 25 is fixedly mounted on the outer wall of the rotating shaft 24. The tilting block 25 is rectangular in shape, and four sets of support members are evenly fixedly mounted on the outer wall of the tilting block 25, with each set of support members forming a 90° angle. Each set of support members includes two support rods 28, which are symmetrically fixedly mounted on the outer wall of the tilting block 25, and the distance between the two support rods 28 is less than the diameter of the steel barrel 20. Several short rotating shafts 26 symmetrically rotate on the inner wall of the tilting frame 23, and the short rotating shafts 26 are located on both sides of the support rods 28. Several long rotating shafts 27 are rotatably mounted on the inner wall of the tilting frame 23. The inner wall of the tilting frame 23 is provided with motors corresponding to each short rotating shaft 26 and long rotating shaft 27, and the motors can drive the corresponding short rotating shaft 26 and long rotating shaft 27. The rotating mechanism 7 rotates, and the flipping frame 23 located at the input end of the conveyor frame 21 transports the steel drum 20 to the top of the short rotating shaft 26 via the long rotating shaft 27. Then, it rotates 90° away from the short rotating shaft 26 via the rotating shaft 24, thereby flipping the vertical steel drum 20 in conjunction with the support member, and turning the steel drum 20 from a vertical position to a flat position. The flipping frame 23 located at the output end of the conveyor frame 21 transports the printed steel drum 20 flat to the top of the support member via the conveyor frame 21. Then, it rotates 90° towards the short rotating shaft 26 via the rotating shaft 24, thereby flipping the flat steel drum 20 to a vertical position and placing it on the top of the short rotating shaft 26. Then, it rotates with the short rotating shaft 26 to transport the steel drum 20 to the top of the long rotating shaft 27 for transport. This avoids scratches on the printed steel drum 20 during transportation and also facilitates the subsequent handling of the printed steel drum 20.

[0044] It also includes a push component, which is located at the input end of the conveyor 21, such as... Figure 4 The push assembly shown includes a column 29, a push cylinder 30, and a push rod 31. The column 29 is fixedly installed on the ground and is located on the side of the support member away from the conveyor frame 21. The push cylinder 30 is fixedly installed on the upper end of the column 29, and the push rod 31 is fixedly installed on the output end of the push cylinder 30. The push rod 31 can contact the steel drum 20 at the upper end of the support rod 28. When the flipping assembly located at the input end of the conveyor frame 21 flips the steel drum 20 to a flat position, the push cylinder 30 is activated to push the push rod 31 towards the steel drum 20, thereby pushing the steel drum 20 located at the upper end of the support member to the upper end of the conveyor frame 21. The steel drum 20 is then transported to the positioning assembly via the conveyor frame 21. The push assembly pushes the steel drum 20 to the upper end of the conveyor frame 21, reducing the labor intensity of the workers and improving the production efficiency of printing on the steel drum 20.

[0045] like Figure 6 and Figure 7The positioning assembly shown includes a lifting platform 32, a rotating rod 33, a drive motor 34, and a sensor 35. The lifting platform 32 is located between the conveyor frames 21 and is fixedly installed on the ground. The drive motor 34 is fixedly installed on the upper left side of the conveyor frame 21. The left end of the rotating rod 33 is fixedly installed on the output end of the drive motor 34, and the right end of the rotating rod 33 is rotatably connected to the inner wall of the conveyor frame 21. Pressure rollers 36 are symmetrically fixedly installed on the outer wall of the rotating rod 33, and the pressure rollers 36 can abut against the outer wall of the steel drum 20. The sensor 35 is fixedly installed... The sensor 35 is fixedly installed on the inner wall of the right end of the conveyor frame 21. The sensor 35 can detect the large opening 37 of the steel drum 20. When the large opening 37 of the steel drum 20 rotates to the front end of the sensor 35, the sensor 35 detects the large opening 37 of the steel drum 20 and transmits an electrical signal to the drive motor 34, thereby controlling the drive motor 34 to stop rotating. This adjusts the large opening 37 of the steel drum 20 to be directly above the steel drum 20, and the small opening 38 to be directly below the steel drum 20, so as to facilitate subsequent printing and improve the printing effect of the steel drum 20.

[0046] The two-color steel drum screen printing method includes the following steps:

[0047] Step 1: The first group of printed parts and the second group of printed parts are located at the starting positions of the first printing area 4 and the second printing area 5, respectively, and the scraper 9 of the first group of printed parts is located directly above the lifting worktable 22.

[0048] Step 2: The conveyor frame 21 transports the steel drum 20 directly above the lifting platform 32. The lifting platform 32 then lifts the steel drum 20, bringing its outer wall into contact with the pressure roller 36. The drive motor 34 starts and rotates the rotating rod 33, causing the pressure roller 36 to rotate. This, in turn, causes the steel drum 20 to rotate between the pressure roller 36 and the lifting platform 32. When the large opening 37 of the steel drum 20 rotates to the front of the sensor 35, the sensor 35 detects the large opening 37 and transmits an electrical signal to the drive motor 34. The drive motor 34... The rotation stops, thus adjusting the large opening 37 of the steel drum 20 to a uniform position. Then, the lifting platform 32 descends and places the steel drum 20 on the upper end of the conveyor frame 21. The conveyor frame 21 then transports the adjusted steel drum 20 to the upper end of the lifting worktable 22. Since the printing is all done from the large opening 37 of the steel drum 20, the position of the printed text on the outer wall of the steel drum 20 is consistent regardless of whether the printing is done clockwise or counterclockwise. This ensures that the printed text position is consistent for the same batch of steel drums 20, increasing the aesthetics of the steel drums 20.

[0049] Step 3, as follows Figure 8 As shown, the lifting worktable 22 lifts the steel barrel 20 to separate it from the conveyor frame 21 and abuts against the pressure strip 16 at the lower end of the printing frame 3. Then, the cylinder 8 of the first set of printed parts controls the scraper 9 to abut against the starting position of the first printing area 4.

[0050] Step 4: The first driving component drives the printing frame 3 to move to the left, and the scraper 9 of the first group of printed parts and the steel barrel 20 remain relatively stationary. The second driving component of the second group drives the second group of printed parts and the printing frame 3 to move to the left synchronously and remain relatively stationary.

[0051] Step 5: When the end of the first printing area 4 moves to below the squeegee 9 of the first group of printed parts, the cylinder 8 of the first group of printed parts controls the squeegee 9 to separate from the first printing area 4. After the squeegee 9 of the first group of printed parts separates from the first printing area 4, the driving component of the first group drives the slider 6 to move to the left on the outer wall of the guide rail 2. The moving speed of the first group of printed parts is equal to the moving speed of the printing frame 3. That is, the squeegee 9 of the first group of printed parts is still located directly above the end position of the first printing area 4 during the movement.

[0052] Step 6: When the scraper 9 of the second set of printed parts moves above the steel barrel 20, the start control of the second set of printed parts corresponds to the scraper 9 abutting against the starting position of the second printing area 5.

[0053] Step 7: As the printing frame 3 continues to move, when the end of the second printing area 5 moves to below the squeegee 9 of the second group of printed parts, the cylinder 8 of the second group of printed parts controls the corresponding squeegee 9 to separate from the second printing area 5, and at the same time the first group of printed parts stops moving.

[0054] Step 8: After the first set of printed parts stops moving, the lifting worktable 22 lowers the steel drum 20 after printing and places it on the upper end of the conveyor frame 21 for conveying. At the same time, the printing frame 3 continues to move to the left for a distance of 5-10cm before stopping. This allows the ink accumulated at one end of the printed parts to move to the path of the next printing, thus avoiding the ink from always being at both ends of the printing path and causing waste of printing ink.

[0055] Step 9, as follows Figure 9 As shown, when the second steel drum 20 to be printed is transported to the upper end of the lifting worktable 22 after passing through the positioning assembly, the printing frame 3 is located to the left of the second steel drum 20. At this time, the printing frame 3 moves to the right, and the second set of printed parts remains stationary. The first set of printed parts moves to the right and remains relatively stationary with respect to the printing frame 3. After the printing assembly reverses the above steps, it completes the printing on the second steel drum 20, and the printing frame 3 and the printing assembly return to the position shown. Figure 8 This is to facilitate printing on the next steel drum 20.

[0056] The specific implementation process is as follows:

[0057] The staff places the steel drum 20 vertically on the upper end of the long rotating shaft 27 of the first set of flipping components. The long rotating shaft 27 rotates to transport the steel drum 20 to the upper end of the short rotating shaft 26. The rotating shaft 24 rotates 90° to drive the support of the outer wall of the flipping block 25 to rotate, thereby flipping the vertical steel drum 20 to a flat position. The pushing component pushes the push rod 31 by activating the pushing cylinder 30, thereby pushing the steel drum 20 located on the upper end of the support to the upper end of the conveyor frame 21 for transportation.

[0058] When the steel drum 20 is transported to the upper end of the lifting platform 32, the lifting platform 32 raises the steel drum 20 to be printed so that it abuts against the pressure roller 36 on the outer wall of the rotating rod 33. The drive motor 34 drives the rotating rod 33 to rotate, thereby driving the pressure roller 36 symmetrically arranged on the outer wall of the rotating rod 33 to rotate, and then driving the steel drum 20 to rotate. When the large opening 37 of the steel drum 20 rotates to the front end of the sensor 35, the sensor 35 recognizes the large opening 37 and transmits an electrical signal to the drive motor 34, thereby controlling the drive motor 34 to stop rotating, and then adjusting the large opening 37 of the steel drum 20 to be printed to a uniform position. When the large opening 37 of the steel drum 20 to be printed is adjusted to the top, the lifting platform 32 lowers and places the steel drum 20 with printing on it above the conveyor frame 21 for transportation.

[0059] The conveyor frame 21 then transports the steel drum 20 to be printed to below the printing station. Once the steel drum 20 is below the printing station, the lifting platform 22 below the conveyor frame 21 lifts the steel drum 20 until the edges of both ends of the steel drum 20 abut against the pressure strip 16 at the lower end of the printing frame 3. At this time, both the left and right scrapers 9 are in their initial positions in the first printing area 4 and the second printing area 5, with the left scraper 9 directly above the steel drum 20. Subsequently, the left scraper 9, under the action of the corresponding cylinder 8, abuts against the first printing area 4. Figure 8As shown, at this time, the first driving component drives the moving frame to move to the left, thereby causing the steel drum 20 to rotate. Meanwhile, the printed part on the left side does not move and remains relatively stationary with respect to the steel drum 20 to be printed. The printed part on the right side moves synchronously with the printing frame 3 and remains relatively stationary. When the end position of the first printing area 4 moves to below the left scraper 9, the left scraper 9 separates from the first printing area 4 under the action of the corresponding cylinder 8. Simultaneously, the left printed part moves along the moving direction of the printing frame 3 and remains relatively stationary. When the right scraper 9 moves to the printing station above the steel drum 20 to be printed, the second driving component on the right side stops moving, and under the action of the corresponding cylinder 8, the right scraper 9 separates from the first printing area 4. The starting positions of the printing area 5 are connected. As the printing frame 3 continues to move to the left, the text of the second printing area 5 is printed on the outer wall of the steel drum 20. When the ending position of the second printing area 5 moves to the bottom of the right scraper 9, the right scraper 9 is separated from the second printing area 5 under the action of the corresponding cylinder 8. At this time, the first steel drum 20 has completed printing. When the printed steel drum 20 is transported to the end of the conveyor frame 21, the steel drum 20 rolls to the upper end of the support at the output end of the conveyor frame 21. Then, with the rotation of the rotating shaft 24, it rotates 90° to flip the flat steel drum 20 to a vertical position and place it on the upper end of the short rotating shaft 26. Finally, the steel drum 20 is transported to the upper end of the long rotating shaft 27 by the rotation of the short rotating shaft 26. Finally, the steel drum 20 is transported to the designated location by the long rotating shaft 27.

[0060] After the first steel drum 20 is printed, the squeegee 9 of the second set of printed parts is positioned above the printing station. When the next steel drum 20 to be printed is conveyed to the area below the printing station by the conveyor frame 21, the squeegee 9 on the right side, under the action of the corresponding cylinder 8, abuts against the end position of the second printing area 5. Figure 9 As shown, at this time, the printing frame 3 moves to the right. After repeating the above steps in the opposite direction, the printed part on the left will be back on the printing station. The scrapers 9 on the left and right sides are both above the starting positions of the first printing area 4 and the second printing area 5. By continuing to repeat the above operation, different texts and colors can be printed continuously on the same axis of the steel drum 20, which can reduce the number of printing steps of the steel drum 20 and improve the printing efficiency of the steel drum 20.

[0061] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A double-color steel drum screen printing method, comprising a conveying frame, a lifting workbench is arranged in the conveying frame, characterized in that: The double-color steel drum screen printing method comprises the following steps: Step 1, the first group of printing pieces and the second group of printing pieces are respectively located at the starting positions of the first printing area and the second printing area, and the first group of printing pieces is located above the lifting workbench; Step 2, the conveying frame conveys the steel drum to above the mouth searching and positioning assembly, and then conveys the steel drum to the lifting workbench after adjusting the steel drum to the specified position; Step 3, the lifting workbench lifts the steel drum to abut against the printing frame, and the first group of printing pieces abuts against the starting position of the first printing area; Step 4, the first driving piece drives the printing frame to move, and the first group of printing pieces is relatively stationary with the steel drum, and the second group of printing pieces moves synchronously with the printing frame and is relatively stationary; Step 5, when the end of the first printing area moves to below the first group of printing pieces, the first group of printing pieces is separated from the first printing area and moves in the direction in which the printing frame moves; Step 6, when the second group of printing pieces moves to above the steel drum, the second group of printing pieces abuts against the starting position of the second printing area; Step 7, when the end of the second printing area moves to below the second group of printing pieces, the second group of printing pieces is separated from the second printing area, and the first group of printing pieces stops moving; Step 8, after the first group of printing pieces stops moving, the printing frame continues to move for 5-10 cm and then stops; Step 9, the printing assembly reverses the above steps to print the next steel drum.

2. The method of claim 1, wherein: The mouth searching and positioning assembly comprises a lifting table, a rotating rod, a driving motor and a sensor, the lifting table is arranged in the conveying frame, the driving motor is arranged at one end of the conveying frame, the rotating rod is arranged at the output end of the driving motor, the other end of the rotating rod is rotatably connected to the conveying frame, the outer wall of the rotating rod is symmetrically provided with a pressing wheel, and the pressing wheel can abut against the outer wall of the steel drum, and the sensor is arranged at one end of the conveying frame close to the opening of the steel drum and can identify the large opening of the steel drum.

3. The method according to claim 2, wherein: The first driving piece comprises a first motor, a first gear and a first rack, the first motor is arranged at one end of the mounting frame, the first gear is arranged at the output end of the first motor, and the first rack is arranged at one end of the printing frame close to the guide rail, and the first gear is engaged with the first rack.

4. The method according to claim 3, wherein: The printing piece comprises a sliding block, a second driving piece, a connecting block, a cylinder and a scraper, the sliding block is arranged at one end of the guide rail away from the mounting frame, the second driving piece is arranged between the sliding block and the guide rail, the second driving piece can move the sliding block on the guide rail, the connecting block is arranged at one end of the sliding block close to the conveying frame, the cylinder is arranged at one end of the connecting block, and the scraper is arranged at the output end of the cylinder, and each scraper can abut against the corresponding first printing area and second printing area.

5. The method according to claim 4, wherein: The second driving member comprises a second motor, a second gear and a second rack, the second motor is arranged at one end of the sliding block away from the guide rail, and the output end of the second motor penetrates through the sliding block, the second gear is arranged at the output end of the second motor, and the second rack is arranged on the inner wall of the guide rail and is engaged with the second gear.

6. The method according to claim 5, wherein: The printing frame is symmetrically provided with a pressing strip close to one end of the conveying frame, the pressing strip can abut against the edge of the steel drum, and a plurality of springs are arranged between the pressing strip and the printing frame.

7. The method according to claim 6, wherein: The sliding block is in the shape of a U, the opening of the sliding block faces one end close to the printing frame, and a through groove is symmetrically arranged in the side wall of the sliding block.

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