Automatic lettering equipment and automatic lettering method for aluminum plastic cover

Abstract

The invention relates to automatic lettering equipment and an automatic lettering method.The automatic lettering equipment is structurally characterized in that a vibration disc feeding device outputs aluminum plastic covers with the top faces facing upwards at the same time through two discharging ports, and a first conveying belt device communicates with the tail end of a discharging channel of the vibration disc feeding device; the first conveying belt device receives and drives the aluminum plastic covers to move in the length direction of the first conveying belt device, and a plasma processing station, a transfer printing station and a heating and drying station are sequentially arranged in the advancing direction of the first conveying belt device. The device further comprises a material receiving device, an equal-interval feeding device, a second conveying belt device and a defect detection device. According to the automatic lettering equipment for the aluminum-plastic cover, automatic feeding, surface plasma treatment, transfer printing, heating and drying and defect detection of the aluminum-plastic cover can be achieved, automation of the whole lettering process of the aluminum-plastic cover is achieved, the lettering efficiency of the aluminum-plastic cover can be improved, and the lettering quality is improved. And lettering operation can be carried out on two rows of multiple aluminum plastic covers at the same time, and lettering efficiency is further greatly improved.

Description

Technical Field

[0001] The invention relates to aluminum-plastic cover processing equipment, in particular to an aluminum-plastic cover automatic printing equipment and an automatic printing method. Background Art

[0002] Aluminum-plastic caps are widely used on packaging bottles in the biopharmaceutical industry. For some products, there's a need to print logos and text on the caps. Pad printing technology uses a flexible pad to transfer ink from a printing plate to the substrate. Currently, printing on aluminum-plastic caps is done manually using manual pad printers. This requires an operator to manually print the top of the cap, resulting in low printing efficiency and poor quality.

[0003] Therefore, there is a need for an automatic printing device for the top surface of the aluminum-plastic cover. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic printing device and an automatic printing method for aluminum-plastic covers, so as to solve the problem that the operator currently operates a manual pad printing machine to print on the top of the aluminum-plastic cover, resulting in low printing efficiency and difficulty in ensuring printing quality.

[0005] The present invention is achieved in this way: an automatic printing device for aluminum-plastic covers comprises the following structure.

[0006] The vibrating plate feeding device comprises two discharge ports and two discharge channels, and the aluminum-plastic covers with the top surfaces facing upwards are discharged simultaneously through the two discharge ports.

[0007] The first conveyor belt device is connected to the end of the discharge channel of the vibration disk loading device, and is used for receiving the aluminum-plastic cover output by the vibration disk loading device and driving the aluminum-plastic cover to move along the length direction of the first conveyor belt device. A plasma treatment station, a pad printing station and a heating and drying station are sequentially arranged along the forward direction of the first conveyor belt device; within the range from the head end of the first conveyor belt device to the end of the plasma treatment station, first side bars are respectively arranged on both sides of the upper surface of the first conveyor belt device, a first middle bar is arranged between the two first side bars, and two channels formed between the first middle bar and the two first side bars respectively correspond to the two discharge channels; within the range from the end of the plasma treatment station to the end of the pad printing station, second side bars are respectively arranged on both sides of the upper surface of the first conveyor belt device, and a second middle bar is arranged between the two second side bars.

[0008] The plasma processing station is provided with a first limiting device and a plasma processing device, wherein the first limiting device is used to temporarily limit a certain amount of aluminum-plastic covers to the plasma processing station, and the plasma processing device is used to perform plasma treatment on the aluminum-plastic covers temporarily limited to the plasma processing station.

[0009] A second limiting device, a clamping and positioning device, and an automatic pad printing device are provided at the pad printing station. The second limiting device is used to temporarily limit a certain amount of aluminum-plastic covers to the pad printing station. The clamping and positioning device is used to clamp and fix the aluminum-plastic covers temporarily restricted to the pad printing station. The automatic pad printing device is used to simultaneously print on the aluminum-plastic covers clamped and fixed to the pad printing station.

[0010] A heating and drying device is provided at the heating and drying station for heating and drying the ink on the top surface of the aluminum-plastic cover.

[0011] The receiving device is located at the end of the first conveyor belt device and is used to receive the aluminum-plastic covers that have been printed and output them one by one in a directional manner.

[0012] The equally spaced feeding device is located at the output end of the receiving device and is used to output the aluminum-plastic covers output by the receiving device at equal intervals.

[0013] The second conveyor belt device is located at the output end of the equally spaced feeding device and is used to receive the equally spaced aluminum-plastic covers output by the equally spaced feeding device.

[0014] The defect detection device is located on the second conveyor belt device and is used to detect defects in the graphics and texts on the top of the aluminum-plastic cover and remove the aluminum-plastic cover with defects.

[0015] and a lifting mechanism is installed in the lifting mode of the lifting frame, and the lifting frame is installed in the lifting mode of the lifting frame. The lifting mechanism is installed in the lifting mode of the lifting frame, and the lifting mechanism is installed in the lifting mode of the lifting frame. The lifting mechanism is installed in the lifting mode of the lifting frame, and the lifting mechanism is installed in the lifting mode of the lifting frame. A first sensor is provided beside the first limiting groove, and a second sensor is provided beside the second limiting groove. The first sensor and the second sensor are used to detect whether an aluminum-plastic cover passes through.

[0016] Furthermore, the plasma processing device includes an XYZ three-axis translation mechanism, and a plasma cleaning machine is provided on the XYZ three-axis translation mechanism.

[0017] Furthermore, the second limiting device includes a third vertical telescopic cylinder arranged on the frame, the third vertical telescopic cylinder is located at the end of the pad printing station, a third lifting frame is arranged on the cylinder shaft of the third vertical telescopic cylinder, and two limiting arms are arranged on the third lifting frame, and the two limiting arms correspond to the two channels on the first conveyor belt device respectively.

[0018] Furthermore, a quantity control mechanism is provided at the head end of the pad printing station, and the quantity control mechanism includes a fourth vertical telescopic cylinder provided on the frame, a fourth lifting frame provided on the cylinder shaft of the fourth vertical telescopic cylinder, and two limit arms provided on the fourth lifting frame, which respectively correspond to the two channels on the first conveyor belt device; a third sensor and a fourth sensor spaced a certain distance apart are respectively provided on both sides of the first conveying device, and the aluminum-plastic cover carried by the first conveying device passes through the third sensor, the fourth sensor and the fourth lifting frame in sequence, and the extension and retraction of the fourth vertical telescopic cylinder is controlled by the third sensor and the fourth sensor.

[0019] Furthermore, the clamping and positioning device includes two guide rods spanning above the first conveying device, and sliding plates are respectively provided on both sides of the first conveying device, the sliding plates are slidably connected to the two guide rails, and a driving mechanism is provided on the two sliding plates to drive the two sliding plates to move closer to or away from each other, and mounting blocks are provided on the inner sides of the two sliding plates, and a plurality of side-by-side positioning fingers are detachably mounted on the mounting blocks, and an arc groove is provided at the end of the positioning finger, and arc positioning grooves corresponding to the positioning fingers are respectively provided on both sides of the second intermediate bar.

[0020] Furthermore, the automatic pad printing device includes a pad printing translation mechanism, a mold mounting plate is connected to the lower part of the pad printing translation mechanism, two rows of print heads are detachably mounted on the mold mounting plate, a printing plate is arranged below the pad printing translation mechanism, a support plate is arranged below the printing plate, a discharge roller and a receiving roller are respectively arranged on both sides of the support plate, an adhesive tape is arranged on the discharge roller, and the adhesive tape is passed between the printing plate and the support plate and is wound up by the receiving roller.

[0021] Furthermore, the material receiving device includes an inclined material receiving bin, the inner cavity height of the material receiving bin is slightly greater than the height of the aluminum-plastic cover, an upper arc guide plate is provided at the upper end of the material receiving device, the upper arc guide plate is located at the end of the first conveyor belt device, and the distance between the upper arc guide plate and the upper surface of the first conveyor belt device is slightly greater than the height of the aluminum-plastic cover, the lower end of the material receiving bin gradually narrows, and a lower arc guide plate is provided at the lower end of the material receiving bin, and a first blowing nozzle is provided at a position opposite to the upper port of the lower arc guide plate and at a distance greater than the diameter of the aluminum-plastic cover.

[0022] Furthermore, the defect detection device includes a defect pattern detection device and a defect rejection device arranged along the second conveyor belt device, and the defect rejection device includes an upper baffle, a second air blowing nozzle and a defective product box. The second air blowing nozzle and the defective product box are respectively located on both sides of the second conveyor belt device, and the upper baffle is located above the second conveyor belt. The defect pattern detection device controls the opening of the second air blowing nozzle to blow the detected defective aluminum-plastic cover into the defective product box.

[0023] Furthermore, the equally spaced feeding device includes a fixed disk, a rotating disk is arranged above the fixed disk, the rotating disk is driven by a motor to rotate at a constant speed, a rib is arranged at the edge of the fixed disk, and accommodating grooves are evenly distributed along the circumferential direction at the edge of the rotating disk, a first notch is provided on one side of the rib, the first notch is used to be connected to the output end of the material receiving device, a second notch is provided on the other side of the rib, the second notch is connected to the head end of the second conveyor belt device, the head end of the second conveyor belt device extends into the second notch and is located below the rotating disk.

[0024] Furthermore, there are two groups of the vibration plate feeding device and the first conveyor belt device.

[0025] The invention also discloses an automatic printing method for aluminum-plastic covers, which is implemented based on the above-mentioned automatic printing device for aluminum-plastic covers and includes the following steps.

[0026] a. Add aluminum-plastic covers to the vibrating plate feeding device, and output the aluminum-plastic covers in two rows with the top surface facing upwards through the vibrating plate feeding device.

[0027] b. The first conveyor belt device drives two rows of aluminum-plastic covers to move forward and pass through the plasma treatment station, pad printing station, and heating and drying station in sequence.

[0028] c. After the aluminum-plastic cover enters the plasma treatment station, the movement of the two rows of aluminum-plastic covers is restricted by the first limiting device, the plasma treatment device is started to perform plasma treatment on the upper surfaces of the two rows of aluminum-plastic covers, and the first limiting device releases the aluminum-plastic cover that has undergone plasma treatment.

[0029] d. Two rows of aluminum-plastic covers enter the pad printing station, and the second limiting device limits the two rows of aluminum-plastic covers in the clamping and fixing device. The positioning fingers on both sides approach each other and cooperate with the second middle bar to clamp the two rows of aluminum-plastic covers in the positioning groove.

[0030] e. The printing plate of the automatic pad printing device moves toward the oil pan while the mold mounting plate drives the print head downward to contact the tape on the support plate. The print head moves up, the printing plate returns to its position, the print head moves down to contact the graphic area of ​​the printing plate to dip in ink, the print head moves to the top of the first conveyor belt device, and the print head moves down to print the ink on the top surface of the aluminum-plastic cover.

[0031] f. The clamping device opens and the second limiting device releases the printed aluminum-plastic cover.

[0032] g. The aluminum-plastic cover enters the heating and drying device to dry the ink on the top by heating.

[0033] h. The aluminum-plastic cover enters the equally spaced conveying device through the receiving device, and is output to the second conveyor belt device at equal intervals by the equally spaced conveying device.

[0034] i. The aluminum-plastic covers pass through the defect detection device at equal intervals, and the aluminum-plastic covers with printing defects are removed.

[0035] Furthermore, when the aluminum-plastic cover enters the pad printing station from the plasma processing station, it passes through the quantity control mechanism, and the third sensor and the fourth sensor detect the number of aluminum-plastic covers passing through. After each predetermined number of aluminum-plastic covers pass through, the fourth vertical telescopic cylinder is controlled to drive the fourth lifting frame to move downward to cut off the two channels of the first conveyor belt device to prevent the aluminum-plastic cover from continuing to enter the printing station.

[0036] Furthermore, in step c, the second lifting frame is initially in a descending state, the second limit bar is located in the second limit groove, and the aluminum-plastic cover moving with the first conveyor belt device is blocked, and the first sensor detects the number of aluminum-plastic covers passing through the first limit groove. When a predetermined number of aluminum-plastic covers pass through, the first vertical telescopic cylinder is controlled to drive the first lifting frame to move downward, so that the first limit bar descends into the first limit groove to cut off the passage of the first conveyor belt device and prevent subsequent aluminum-plastic covers from passing through; the aluminum-plastic cover between the first limit groove and the second limit groove is plasma treated; after the plasma treatment is completed, the second vertical telescopic cylinder is controlled to drive the second lifting frame to rise, and the aluminum-plastic cover between the first limit groove and the second limit groove continues to move with the first conveyor belt device, and the second sensor detects the number of aluminum-plastic covers passing through. When a predetermined number of aluminum-plastic covers pass through, the second vertical telescopic cylinder drives the second lifting frame to descend and cut off the passage of the first conveyor belt device again, and at the same time controls the first vertical telescopic cylinder to drive the first lifting frame to rise, so that subsequent aluminum-plastic covers can enter between the first limit groove and the second limit groove.

[0037] The automatic printing equipment for aluminum-plastic covers of the present invention can realize automatic loading, surface plasma treatment, pad printing, heating and drying, and defect detection of aluminum-plastic covers, realizing automation of the entire printing process of aluminum-plastic covers, thereby improving the printing efficiency and printing quality of aluminum-plastic covers. In addition, it can print on two rows of multiple aluminum-plastic covers at the same time, further greatly improving printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural diagram of the automatic printing equipment for aluminum-plastic cover of the present invention.

[0039] Figure 2 yes Figure 1A magnified view of a section of the plasma treatment station.

[0040] Figure 3 yes Figure 1 A partial enlarged view of the middle pad printing station.

[0041] Figure 4 yes Figure 1 Center AA view.

[0042] Figure 5 It is a structural diagram of the plasma processing device of the present invention.

[0043] Figure 6 It is a side view of the first vertical telescopic cylinder and the first lifting frame of the present invention.

[0044] Figure 7 It is a side view of the second vertical telescopic cylinder, the second lifting frame, the fourth vertical telescopic rod, and the fourth lifting frame of the present invention.

[0045] Figure 8 It is a side view of the second limiting device of the present invention.

[0046] Figure 9 It is a structural diagram of the automatic pad printing device of the present invention.

[0047] Figure 10 It is a schematic diagram of the material receiving device of the present invention.

[0048] In the figure: 1. Vibrating plate loading device; 2. First conveyor belt device; 3. Plasma treatment station; 4. Pad printing station; 5. Heating and drying station; 6. Plasma treatment device; 7. First limit device; 8. Second limit device; 9. Clamping and positioning device; 10. Quantity control mechanism; 11. Automatic pad printing device; 12. Heating and drying device; 13. Material receiving device; 14. Equal-interval feeding device; 15. Second conveyor belt device; 16. Defect detection device; 17. Frame; 1-1. Discharge channel; 2-1. Conveyor belt; 2-2. First side bar; 2-3, first middle bar; 2-4, first mounting bracket; 2-5, second mounting bracket; 2-6, second side bar; 2-7, second middle bar; 6-1, XYZ three-axis translation mechanism; 6-2, plasma cleaner; 7-1, first fixed bracket; 7-2, first vertical telescopic cylinder; 7-3, first lifting bracket; 7-4, first limiting bar; 7-5, first limiting slot; 7-6, second fixed bracket; 7-7, second vertical telescopic cylinder; 7-8, second lifting bracket; 7-9, second limiting bar; 7-10, second Limiting slot; 7-11, first sensor; 7-12, second sensor; 8-1, third fixing frame; 8-2, third vertical telescopic cylinder; 8-3, third lifting frame; 9-1, guide rod; 9-2, sliding plate; 9-3, mounting block; 9-4, positioning finger; 9-5, positioning slot; 10-1, fourth vertical telescopic cylinder; 10-2, fourth lifting frame; 10-3, third sensor; 10-4, fourth sensor; 11-1, pad printing translation mechanism; 11-2, mold mounting plate; 11-3, print head; 11-4, printing plate; 11 -5, support plate; 11-6, unwinding roller; 11-7, adhesive tape; 11-8, receiving roller; 11-9, guide roller; 13-1, receiving bin; 13-2, upper arc guide plate; 13-3, lower arc guide plate; 13-4, first air blowing nozzle; 14-1, fixed disk; 14-2, rotating disk; 14-3, side rib; 14-4, receiving groove; 14-5, first notch; 14-6, second notch; 16-1, defect pattern detection device; 16-2, upper baffle; 16-3, second air blowing nozzle; 16-4, defective product box. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used to indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are used solely to facilitate the description of the present invention and to simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, terms such as "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] like Figures 1 to 4 As shown, the automatic printing equipment for aluminum-plastic covers of the present invention includes a vibration plate loading device 1, a first conveyor belt device 2, a plasma processing device 6, an automatic pad printing device 11, a heating and drying device 12, a material receiving device 13, an equidistant feeding device 14, a second conveyor belt device 15 and a defect detection device 16.

[0052] Among them, the vibration plate loading device 1 is an existing technology, which realizes the directional output of materials through the vibration of the vibration plate, and multiple discharge ports can be designed as needed. In the present invention, each vibration plate loading device 1 includes two discharge ports and two discharge channels 1-1, and can output the aluminum-plastic cover with the top surface facing up at the same time through the two discharge ports, and convey the two rows of aluminum-plastic covers to the first conveyor belt device 2 through the two discharge channels 1-1.

[0053] The head end of the first conveyor belt device 2 is connected to the end of the discharge channel 1-1 of the vibrating disk loading device 1. After the aluminum-plastic cover enters the first conveyor belt device 2, it is driven by the first conveyor belt device 2 to move along the length direction of the first conveyor belt device 2, wherein the first conveyor belt device 2 continues to operate.

[0054] The first conveyor belt device 2 is divided into a plasma treatment station 3, a pad printing station 4 and a heating and drying station 5 in sequence along the forward direction, for performing plasma treatment, printing and heating and drying operations on the aluminum-plastic cover respectively.

[0055] In the range from the head end of the first conveyor belt device 2 to the end of the plasma processing station 3, first side bars 2-2 are respectively arranged on both sides of the upper surface of the first conveyor belt device 2, and a first intermediate bar 2-3 is arranged between the two first side bars 2-2. The two channels formed between the first intermediate bar 2-3 and the two first side bars respectively correspond to the two discharge channels 1-1.

[0056] like Figure 4As shown, the two first side bars 2-2 are fixedly connected to the frame 17, and the upper structure of the first side bar 2-2 is higher than the conveyor belt 2-1. The conveyor belt 2-1 will not rub against the first side bar 2-2 during movement. At the same time, the first middle bar 2-3 is fixedly connected to the first side bar 2-2 on one side through the first mounting frame 2-4 on the top, so that the first middle bar 2-3 is suspended above the conveyor belt 2-1, so that there is no contact between the first middle bar 2-3 and the conveyor belt 2-1.

[0057] In the range from the end of the plasma processing station 3 to the end of the pad printing station 4, second side bars are respectively arranged on both sides of the upper surface of the first conveyor belt device 2, and a second intermediate bar 2-7 is arranged between the two second side bars. The arrangement method of the second side bar 2-6 and the second intermediate bar 2-7 is the same as the arrangement method of the first side bar 2-2 and the first intermediate bar 2-3. The second intermediate bar 2-7 is fixedly connected to the second side bar on one side through the second mounting frame 2-5, so that the second intermediate bar 2-7 is suspended above the conveyor belt 2-1.

[0058] The second side bars 2-6 and the second middle bars 2-7 are both made of metal.

[0059] A first limiting device 7 and a plasma processing device 6 are provided at the plasma processing station 3 . The plasma processing device 6 is located above the first conveying device.

[0060] The first limiting device 7 is used to temporarily limit a certain amount of aluminum-plastic covers to the plasma processing station 3 , and the plasma processing device 6 is used to perform plasma processing on the aluminum-plastic covers temporarily limited to the plasma processing station 3 .

[0061] Among them, the first limiting device 7 includes a first vertical telescopic cylinder 7-2 and a second vertical telescopic cylinder 7-7 arranged on the frame 17. The first vertical telescopic cylinder 7-2 and the second vertical telescopic cylinder 7-7 are distributed front and back along the moving direction of the first conveyor belt device 2. The first vertical telescopic cylinder 7-2 is located at the rear part of the moving direction, and the second vertical telescopic cylinder 7-7 is located at the front part of the moving direction. A space of a distance is formed between the two for plasma treatment.

[0062] The first vertical telescopic cylinder 7-2 is fixedly mounted on the first fixed frame 7-1 and connected to the frame 17 via the first fixed frame 7-1. A first lifting frame 7-3 is disposed on the cylinder shaft of the first vertical telescopic cylinder 7-2. The two connecting arms of the first lifting frame 7-3 are located outside the two first side bars 2-2. Inwardly extending first limiting bars 7-4 are disposed on the two connecting arms of the first lifting frame 7-3. A first limiting groove 7-5 is defined on the first side bar at a position corresponding to the first limiting bar 7-4. The inner end of the first limiting bar 7-4 extends beyond the inner edge of the first side bar 2-2. When the first lifting frame 7-3 moves up and down, it drives the first limiting bar 7-4 downward into the first limiting groove 7-5. The extended portion of the first limiting bar 7-4 can block the passage on the first conveyor belt device 2, preventing the aluminum-plastic cover from passing through.

[0063] The second vertical telescopic cylinder 7-7 is fixedly mounted on the second fixed frame 7-6 and connected to the frame 17 via the second fixed frame 7-6. A second lifting frame 7-8 is provided on the cylinder shaft of the second vertical telescopic cylinder 7-7. The two connecting arms of the second lifting frame 7-8 are located outside the two first side bars 2-2. The two connecting arms of the second lifting frame 7-8 are respectively provided with second limiting bars 7-9 extending inward. A second limiting groove 7-10 is provided on the first side bar at a position corresponding to the second limiting bar 7-9. The inner end of the second limiting bar 7-9 extends out of the inner side edge of the first side bar 2-2. When the second lifting frame 7-8 moves up and down, it can drive the second limiting bar 7-9 downward into the first limiting groove 7-5. The extended portion of the second limiting bar 7-9 can cut off the passage on the first conveyor belt device 2, preventing the aluminum-plastic cover from passing through.

[0064] The first limiting groove 7-5 and the second limiting groove 7-10 are separated by a certain distance. The first limiting strip 7-4 and the second limiting strip 7-9 can limit a certain number of aluminum-plastic covers between the first limiting groove 7-5 and the second limiting groove 7-10 to facilitate plasma treatment.

[0065] A first sensor 7-11 is provided next to the first limit groove 7-5, and a second sensor 7-12 is provided next to the second limit groove 7-10. The first sensor 7-11 and the second sensor 7-12 are used to detect whether an aluminum-plastic cover passes through, and control the extension and retraction of the first vertical telescopic cylinder 7-2 and the second vertical telescopic cylinder 7-7 according to the detection signal.

[0066] The plasma processing device 6 includes an XYZ three-axis translation mechanism 6-1 and a plasma cleaner 6-2. The XYZ three-axis translation mechanism 6-1 spans above the first conveyor belt device 2. The XYZ three-axis translation mechanism 6-1 drives the movement of the plasma cleaner 6-2, thereby performing plasma treatment on the top surface of the aluminum-plastic cover temporarily limited between the first limiting groove 7-5 and the second limiting groove 7-10.

[0067] Among them, the plasma cleaning machine 6-2 is available on the market and can effectively remove oil stains on the top of the aluminum-plastic cover, making it easier for ink to adhere during subsequent pad printing.

[0068] A second limiting device 8, a clamping and positioning device 9 and an automatic pad printing device 11 are provided at the pad printing station 4. The second limiting device 8 is used to temporarily limit a certain amount of aluminum-plastic covers to the pad printing station 4. The clamping and positioning device 9 is used to clamp and fix the aluminum-plastic covers temporarily restricted to the pad printing station 4. The automatic pad printing device 11 is used to simultaneously print on the aluminum-plastic covers clamped and fixed to the pad printing station 4.

[0069] The second limiting device 8 includes a third vertical telescopic cylinder 8-2 disposed on a third fixed frame 8-1, which is connected to the frame 17 via the third fixed frame 8-1. The third fixed frame 8-1 is located at the end of the pad printing station 4. A third lifting frame 8-3 is disposed on the cylinder shaft of the third vertical telescopic cylinder 8-2. Two limiting arms are disposed on the third lifting frame 8-3, and the two limiting arms correspond to the two channels on the first conveyor belt device 2. When the two limiting arms of the third lifting frame 8-3 are located above the first conveyor belt device 2, the aluminum-plastic cover can smoothly pass through the two channels on the first conveyor belt device 2. When the third vertical telescopic cylinder 8-2 drives the third lifting frame 8-3 to move downward, the two limiting arms enter the two channels on the first conveyor belt device 2, cutting off the two channels on the first conveyor belt device 2, blocking the aluminum-plastic cover from moving with the first conveyor belt device 2, thereby facilitating subsequent clamping and positioning operations.

[0070] The clamping and positioning device 9 includes two guide rods 9-1 extending across the top of the first conveyor. Sliding plates 9-2 are provided on either side of the first conveyor, each slidably connected to the two guide rails. A drive mechanism is provided on each of the sliding plates 9-2 to drive the two sliding plates 9-2 toward or away from each other. Mounting blocks 9-3 are provided on the inner sides of the two sliding plates 9-2. Several positioning fingers 9-4 are detachably mounted on the mounting blocks 9-3. The ends of the positioning fingers 9-4 are provided with arcuate grooves. Arcuate positioning grooves 9-5 corresponding to the positioning fingers 9-4 are provided on either side of the second intermediate bar 2-7. When the positioning fingers 9-4 approach each other, the aluminum-plastic covers on the first conveyor are clamped and fixed within the arcuate grooves of the second intermediate bar 2-7, thereby securing the two rows of aluminum-plastic covers. This clamping and fixing prevents the downward pressure of the print head 11-3 on the aluminum-plastic covers from causing significant friction between the aluminum-plastic covers and the surface of the conveyor belt 2-1 during the printing process.

[0071] Because the number of positioning slots 9-5 is fixed, the pad printing station 4 must always be fed with the same number of aluminum-plastic covers as the number of positioning slots 9-5. Therefore, a quantity control mechanism 10 is provided at the head end of the pad printing station 4. This quantity control mechanism 10 comprises a fourth vertical telescopic cylinder 10-1 mounted on the second fixed frame 7-6. A fourth lifting frame 10-2 is mounted on the cylinder shaft of the fourth vertical telescopic cylinder 10-1. Four limiting arms are provided on the fourth lifting frame 10-2, corresponding to two channels on the first conveyor belt assembly 2. The rising and falling of the fourth lifting frame 10-2 controls the opening and closing of the two channels of the first conveyor assembly, thereby controlling the passage of aluminum-plastic covers. A third sensor 10-3 and a fourth sensor 10-4 are respectively provided at both sides of the first conveying device at a certain distance. The aluminum-plastic cover carried by the first conveying device passes through the third sensor 10-3, the fourth sensor 10-4 and the four lifting frames in sequence. The third sensor 10-3 and the fourth sensor 10-4 are used to detect whether there are aluminum-plastic covers passing through and the number of passing ones. The third sensor 10-3 and the fourth sensor 10-4 control the extension and retraction of the fourth vertical telescopic cylinder 10-1.

[0072] The automatic pad printing device 11 is located on one side of the first conveyor belt device 2. The automatic pad printing device 11 includes a pad printing translation mechanism 11-1. A mold mounting plate 11-2 is connected to the lower part of the pad printing translation mechanism 11-1. Two rows of print heads 11-3 are detachably mounted on the mold mounting plate 11-2. A printing plate 11-4 is arranged below the pad printing translation mechanism 11-1.

[0073] The printing head 11-3 is driven to move back and forth above the printing plate 11-4 and above the first conveyor belt device 2 through the pad printing translation mechanism 11-1. At the same time, the printing plate 11-4 moves back and forth, so that the image area of ​​the printing plate 11-4 moves to the bottom of the ink box to add ink and then reset to wait for the printing head 11-3 to dip in ink.

[0074] Since some ink may still remain on the print head 11-3 after the ink on the print head 11-3 contacts and prints with the top surface of the aluminum-plastic cover, a support plate 11-5 is provided below the printing plate 11-4, and a feeding roller 11-6 and a receiving roller 11-8 are provided on both sides of the support plate 11-5. A tape 11-7 is provided on the feeding roller 11-6, and the tape 11-7 is wound up by the receiving roller 11-8 through the space between the printing plate 11-4 and the support plate 11-5. When the graphic area of ​​the printing plate 11-4 moves to the bottom of the oil box, the tape 11-7 below is exposed, and the print head 11-3 is moved downward to contact the adhesive surface of the tape 11-7 to remove the ink remaining on the print head 11-3. In this way, when the print head 11-3 dips the ink in the graphic area again, the quality of the pad printing will not be affected by excessive ink.

[0075] Two guide rollers 11-9 are provided on the support plate 11-5. The two guide rollers 11-9 are respectively located on both sides of the printing plate 11-4. The adhesive tape 11-7 is passed horizontally through the gap between the support plate 11-5 and the printing plate 11-4 through the two guide rollers 11-9.

[0076] A heating and drying device 12 is provided at the heating and drying station 5. The heating and drying device 12 includes a cover body with a certain length. The cover body covers the first conveyor belt device 2. A heating device is provided in the cover body. When the aluminum-plastic cover with ink passes through the heating and drying device 12, it is heated for a period of time, thereby drying the ink to prevent the ink on the top of the aluminum-plastic cover from falling off or deforming in subsequent processes.

[0077] Among them, the first sensor, the second sensor, the third sensor and the fourth sensor are all Hall sensors. When the aluminum-plastic cover passes, the magnetic field changes, so that it can be identified whether an aluminum-plastic cover passes. In order not to affect the detection of the Hall sensor, the first side bar 2-2 and the middle bar are both made of non-metallic materials.

[0078] like Figure 1 As shown, in one embodiment of the present invention, there are two first conveyor belt devices 2, and the two first conveyor belt devices 2 are arranged in parallel. A vibration disk loading device 1 is provided at the head end of each first conveyor belt device 2, and a first limiting device 7, a second limiting device 8 and a heating and drying device 12 are sequentially provided on each first conveyor belt device 2, and the plasma processing device 6 and the automatic pad printing device 11 are shared by the two first conveyor belt devices 2.

[0079] In the two parallel devices, by adjusting the various devices, such as replacing the second middle gear 2-7 and the positioning finger 9-4, they can adapt to different aluminum-plastic covers, and replace the printing head 11-3 accordingly to print on different products.

[0080] The receiving device 13 is located at the end of the first conveyor belt device 2, and is used to receive the printed aluminum-plastic covers and output them individually in a directional manner.

[0081] The material receiving device 13 includes an inclined material receiving bin 13-1. An upper curved guide plate 13-2 is disposed at the upper end of the material receiving device 13. The upper curved guide plate 13-2 is located at the end of the first conveyor belt device 2, and the distance between the upper curved guide plate 13-2 and the upper surface of the first conveyor belt device 2 is slightly greater than the height of the aluminum-plastic cover. After the aluminum-plastic cover moves to the end of the first conveyor belt device 2, it enters the material receiving bin 13-1 along the curved conveyor belt 2-1 and the upper curved guide plate 13-2, thereby transitioning from a horizontal position to an inclined position. The height of the inner cavity of the material receiving bin 13-1 is slightly greater than the height of the aluminum-plastic cover, allowing the aluminum-plastic cover to pass through the inner cavity of the material receiving bin 13-1. During movement, the aluminum-plastic cover does not flip over, maintaining its top surface facing upward. The material receiving bin 13-1 has a certain width and gradually narrows at its lower end, allowing the aluminum-plastic cover to temporarily accumulate in the material receiving bin 13-1 pending delivery. A lower curved guide plate 13-3 is provided at the lower end of the receiving bin 13-1, which converts the tilted aluminum-plastic covers into a horizontal position for output. A first air blowing nozzle 13-4 is provided at a position greater than the diameter of the aluminum-plastic cover and directly opposite the upper end of the lower curved guide plate 13-3. The aluminum-plastic covers that reach the upper end of the lower curved guide plate 13-3, under the influence of their own weight, the thrust of the aluminum-plastic covers above them, and the thrust of the airflow from the first air blowing nozzle 13-4, pass through the lower flat guide plate and enter the evenly spaced feeding device 14 in the front.

[0082] The equally spaced feeding device 14 is located at the output end of the receiving device 13 and is used to output the aluminum-plastic covers output by the receiving device 13 at equal intervals. The equally spaced feeding device 14 includes a horizontal fixed disk 14-1, a horizontal rotating disk 14-2 is provided above the fixed disk 14-1, and the rotating disk 14-2 is driven by a motor to rotate at a constant speed. A rib 14-3 is provided on the edge of the fixed disk 14-1, and receiving grooves 14-4 are evenly distributed along the circumferential direction on the edge of the rotating disk 14-2. A first notch 14-5 is provided on one side of the rib 14-3, and the first notch 14-5 is used to connect to the output end of the receiving device 13. A second notch 14-6 is provided on the other side of the rib 14-3. The second notch 14-6 is connected to the head end of the second conveyor belt device 15. The head end of the second conveyor belt device 15 extends into the second notch 14-6 and is located below the rotating disk 14-2. The aluminum-plastic covers output by the receiving device 13 enter the accommodating groove 14-4 of the horizontal rotating disk 14-2 in turn, and are driven by the rotating disk 14-2 to move from the first notch 14-5 to the second notch 14-6. After reaching the second notch 14-6, the lower end surface of the aluminum-plastic cover enters above the second conveyor belt device 15 and contacts the upper surface of the second conveyor belt device 15. Driven by the second conveyor belt device 15, it detaches from the rotating disk 14-2 and moves with the second conveyor belt device 15.

[0083] Since the aluminum-plastic covers are outputted at equal intervals by the rotating disk 14 - 2 , the aluminum-plastic covers are also distributed at equal intervals on the second conveyor belt device 15 , so as to facilitate subsequent image detection and rejection of defective products.

[0084] The defect detection device 16, located on the second conveyor belt device 15, is used to detect defects in the graphics on the top of the aluminum-plastic covers and reject defective aluminum-plastic covers. The defect detection device 16 includes a defect pattern detection device 16-1 and a defect rejection device, arranged along the second conveyor belt device 15. The defect pattern detection device 16-1 photographs each aluminum-plastic cover passing through and uses image recognition technology to identify defects. Defective aluminum-plastic covers are then rejected by the defect rejection device. The defect rejection device includes an upper baffle 16-2, a second air blowing nozzle 16-3, and a defective product bin 16-4. The second air blowing nozzle 16-3 and the defective product bin 16-4 are located on either side of the second conveyor belt device 15, with the upper baffle 16-2 located above the second conveyor belt. When a defective aluminum-plastic cover passes below the upper baffle 16-2, the defect pattern detection device 16-1 controls the second air blowing nozzle 16-3 on one side to blow the defective cover into the defective product bin 16-4.

[0085] In another embodiment of the present invention, for the case of using ink materials that are difficult to dry, a conveyor belt is added between the receiving device 13 and the equally spaced feeding device 14, and a drying device is also provided on the conveyor belt. The aluminum-plastic covers outputted in a single row by the receiving device 13 are dried again by the drying device, and the dried aluminum-plastic covers then enter the equally spaced feeding device 14 and the subsequent defect detection device 16.

[0086] The invention also discloses an automatic printing method for aluminum-plastic covers, which is implemented based on the above-mentioned automatic printing device for aluminum-plastic covers and includes the following steps.

[0087] a. Add aluminum-plastic covers to the vibration plate feeding device 1, and output the aluminum-plastic covers in two rows with the top surface facing upwards through the vibration plate feeding device 1.

[0088] b. The first conveyor belt device 2 drives two rows of aluminum-plastic covers to move forward and pass through the plasma treatment station 3, the pad printing station 4, and the heating and drying station 5 in sequence.

[0089] c. After the aluminum-plastic cover enters the plasma treatment station 3, the movement of the two rows of multiple aluminum-plastic covers is limited by the first limiting device 7, the plasma treatment device 6 is started to perform plasma treatment on the upper surface of the two rows of aluminum-plastic covers, and the first limiting device 7 releases the aluminum-plastic cover after plasma treatment.

[0090] d. Two rows of aluminum-plastic covers enter the pad printing station 4, and the second limiting device 8 limits the two rows of multiple aluminum-plastic covers in the clamping device. The positioning fingers 9-4 on both sides approach each other and cooperate with the second intermediate bar 2-7 to clamp the two rows of aluminum-plastic covers in the positioning groove 9-5.

[0091] e. The printing plate 11-4 of the automatic pad printing device 11 moves toward the oil pan while the mold mounting plate 11-2 drives the print head 11-3 downward to contact the tape 11-7 on the support plate 11-5. The print head 11-3 moves upward, the printing plate 11-4 returns to its original position, the print head 11-3 moves downward to contact the graphic area of ​​the printing plate 11-4 to dip in ink, and the print head 11-3 moves to above the first conveyor belt device 2. The print head 11-3 moves downward to print the ink on the top surface of the aluminum-plastic cover.

[0092] f. The clamping device is opened, and the second limiting device 8 releases the printed aluminum-plastic cover.

[0093] g. The aluminum-plastic cover enters the heating and drying device 12, where the ink on the top is dried by heating.

[0094] h. The aluminum-plastic cover enters the equally spaced conveying device through the receiving device 13 and is output to the second conveyor belt device 15 at equal intervals by the equally spaced conveying device.

[0095] i. The aluminum-plastic covers pass through the defect detection device 16 at equal intervals, and the aluminum-plastic covers with printing defects are removed.

[0096] Among them, when the aluminum-plastic cover enters the pad printing station 4 from the plasma processing station 3, it passes through the quantity control mechanism 10, and the third sensor 10-3 and the fourth sensor 10-4 detect the number of aluminum-plastic covers passing through. After each predetermined number of aluminum-plastic covers pass through, the fourth vertical telescopic cylinder 10-1 is controlled to drive the fourth lifting frame 10-2 to move downward to cut off the two channels of the first conveyor belt device 2 to prevent the aluminum-plastic cover from continuing to enter the printing station.

[0097] In step c, the second lifting frame 7-8 is initially in a descending state, and the second limiting bar 7-9 is located in the second limiting groove 7-10 to block the aluminum-plastic cover moving with the first conveyor belt device 2. The first sensor 7-11 detects the number of aluminum-plastic covers passing through the first limiting groove 7-5. When a predetermined number of aluminum-plastic covers have passed through, the first vertical telescopic cylinder 7-2 is controlled to drive the first lifting frame 7-3 to move downward, so that the first limiting bar 7-4 is lowered into the first limiting groove 7-5 to cut off the passage of the first conveyor belt device 2 and prevent subsequent aluminum-plastic covers from passing through; the aluminum-plastic cover between the first limiting groove 7-5 and the second limiting groove 7-10 is Plasma treatment is performed; after the plasma treatment is completed, the second vertical telescopic cylinder is controlled to drive the second lifting frame 7-8 to lift, and the aluminum-plastic cover between the first limit groove 7-5 and the second limit groove 7-10 continues to move with the first conveyor belt device 2, and the second sensor 7-12 detects the number of aluminum-plastic covers passing through. When a predetermined number of aluminum-plastic covers pass through, the second vertical telescopic cylinder drives the second lifting frame 7-8 to descend and re-cut the channel of the first conveyor belt device 2, and at the same time controls the first vertical telescopic cylinder to drive the first lifting frame 7-3 to lift, so that the subsequent aluminum-plastic cover can enter between the first limit groove 7-5 and the second limit groove 7-10.

[0098] The automatic printing equipment for aluminum-plastic covers of the present invention can realize automatic loading, surface plasma treatment, pad printing, heating and drying, and defect detection of aluminum-plastic covers, realizing automation of the entire printing process of aluminum-plastic covers, thereby improving the printing efficiency and printing quality of aluminum-plastic covers. In addition, it can print on two rows of multiple aluminum-plastic covers at the same time, further greatly improving printing efficiency.

[0099] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic printing device for aluminum-plastic covers, characterized in that: include The vibrating plate feeding device includes two discharge ports and two discharge channels, and the aluminum-plastic covers with the top surface facing upward are discharged simultaneously through the two discharge ports; The first conveyor belt device is connected to the end of the discharge channel of the vibration plate loading device, and is used for receiving the aluminum-plastic covers output by the vibration plate loading device and driving the aluminum-plastic covers to move along the length direction of the first conveyor belt device. A plasma treatment station, a pad printing station and a heating and drying station are sequentially arranged along the forward direction of the first conveyor belt device; in the range from the head end of the first conveyor belt device to the end of the plasma treatment station, first side bars are respectively arranged on both sides of the upper surface of the first conveyor belt device, a first middle bar is arranged between the two first side bars, and two channels formed between the first middle bar and the two first side bars respectively correspond to the two discharge channels; in the range from the end of the plasma treatment station to the end of the pad printing station, second side bars are respectively arranged on both sides of the upper surface of the first conveyor belt device, and a second middle bar is arranged between the two second side bars; The plasma treatment station is provided with a first limiting device and a plasma treatment device, wherein the first limiting device is used to temporarily limit a certain amount of aluminum-plastic covers to the plasma treatment station, and the plasma treatment device is used to perform plasma treatment on the aluminum-plastic covers temporarily limited to the plasma treatment station; The pad printing station is provided with a second limiting device, a clamping and positioning device, and an automatic pad printing device. The second limiting device is used to temporarily limit a certain amount of aluminum-plastic covers to the pad printing station. The clamping and positioning device is used to clamp and fix the aluminum-plastic covers temporarily restricted to the pad printing station. The automatic pad printing device is used to simultaneously print on the aluminum-plastic covers clamped and fixed to the pad printing station. A heating and drying device is provided at the heating and drying station to heat and dry the ink on the top surface of the aluminum-plastic cover; A receiving device is located at the end of the first conveyor belt device, and is used to receive the printed aluminum-plastic covers and output them individually in a directional manner; The equal-interval feeding device is located at the output end of the receiving device and is used to output the aluminum-plastic covers output by the receiving device at equal intervals; The second conveyor belt device is located at the output end of the equally spaced feeding device and is used to receive the equally spaced aluminum-plastic covers output by the equally spaced feeding device; The defect detection device is located on the second conveyor belt device and is used to detect defects in the graphics and texts on the top of the aluminum-plastic cover and remove the aluminum-plastic cover with defects.

2. The automatic printing equipment for aluminum-plastic cover according to claim 1, characterized in that: The first limiting device includes a first vertical telescopic cylinder and a second vertical telescopic cylinder arranged on the frame, the first vertical telescopic cylinder and the second vertical telescopic cylinder are distributed front and back along the first conveyor belt device; a first lifting frame is provided on the cylinder shaft of the first vertical telescopic cylinder, the two connecting arms of the first lifting frame are located on the outer sides of the two first side stop bars, and the two connecting arms of the first lifting frame are respectively provided with a first limiting bar extending inwardly; a second lifting frame is provided on the cylinder shaft of the second vertical telescopic cylinder, the two connecting arms of the second lifting frame are located on the outer sides of the two first side stop bars, and the two connecting arms of the second lifting frame are respectively provided with a second limiting bar extending inwardly; the two first side stop bars are respectively provided with a first limiting groove and a second limiting groove spaced a certain distance apart, the first vertical telescopic cylinder and the second vertical telescopic cylinder respectively drive the first limiting bar and the second limiting bar downwardly into the first limiting groove and the second limiting groove, and the inner ends of the first limiting bar and the second limiting bar respectively exceed the inner side edge of the first side stop bar; A first sensor is provided beside the first limiting groove, and a second sensor is provided beside the second limiting groove. The first sensor and the second sensor are used to detect whether an aluminum-plastic cover passes through.

3. The automatic printing device for aluminum-plastic cover according to claim 1, characterized in that: The second limiting device includes a third vertical telescopic cylinder arranged on the frame, the third vertical telescopic cylinder is located at the end of the pad printing station, a third lifting frame is arranged on the cylinder shaft of the third vertical telescopic cylinder, and two limiting arms are arranged on the third lifting frame, and the two limiting arms correspond to the two channels on the first conveyor belt device respectively.

4. The automatic printing device for aluminum-plastic cover according to claim 1, characterized in that: A quantity control mechanism is provided at the head end of the pad printing station, and the quantity control mechanism includes a fourth vertical telescopic cylinder provided on the frame, a fourth lifting frame provided on the cylinder shaft of the fourth vertical telescopic cylinder, and two limit arms provided on the fourth lifting frame, which respectively correspond to the two channels on the first conveyor belt device; a third sensor and a fourth sensor are respectively provided on both sides of the first conveyor device at a certain distance, and the aluminum-plastic cover carried by the first conveyor device passes through the third sensor, the fourth sensor and the fourth lifting frame in sequence, and the extension and retraction of the fourth vertical telescopic cylinder is controlled by the third sensor and the fourth sensor.

5. The automatic printing device for aluminum-plastic cover according to claim 1, characterized in that: The clamping and positioning device includes two guide rods spanning the top of the first conveying device, and sliding plates are respectively provided on both sides of the first conveying device, and the sliding plates are slidably connected to the two guide rails. A driving mechanism is provided on the two sliding plates to drive the two sliding plates to move closer to or away from each other, and a mounting block is provided on the inner side surfaces of the two sliding plates, and a plurality of side-by-side positioning fingers are detachably mounted on the mounting block, and an arc groove is provided at the end of the positioning finger, and arc positioning grooves corresponding to the positioning fingers are respectively provided on both sides of the second intermediate bar.

6. The automatic printing device for aluminum-plastic cover according to claim 1, characterized in that: The automatic pad printing device includes a pad printing translation mechanism, a mold mounting plate is connected to the lower part of the pad printing translation mechanism, two rows of print heads are detachably mounted on the mold mounting plate, a printing plate is arranged below the pad printing translation mechanism, a support plate is arranged below the printing plate, a discharge roller and a receiving roller are respectively arranged on both sides of the support plate, an adhesive tape is arranged on the discharge roller, and the adhesive tape is passed between the printing plate and the support plate and is wound up by the receiving roller.

7. The automatic printing device for aluminum-plastic cover according to claim 1, characterized in that: The material receiving device includes an inclined material receiving bin, the inner cavity height of the material receiving bin is slightly greater than the height of the aluminum-plastic cover, an upper arc-shaped guide plate is provided at the upper end of the material receiving device, the upper arc-shaped guide plate is located at the end of the first conveyor belt device, and the distance between the upper arc-shaped guide plate and the upper surface of the first conveyor belt device is slightly greater than the height of the aluminum-plastic cover, the lower end of the material receiving bin gradually narrows, and a lower arc-shaped guide plate is provided at the lower end of the material receiving bin, and a first blowing nozzle is provided at a position opposite to the upper port of the lower arc-shaped guide plate and at a distance greater than the diameter of the aluminum-plastic cover.

8. The automatic printing device for aluminum-plastic covers according to claim 1, characterized in that: The equally spaced feeding device includes a fixed disk, a rotating disk is arranged above the fixed disk, the rotating disk is driven by a motor to rotate at a constant speed, a rib is arranged on the edge of the fixed disk, and accommodating grooves are evenly distributed along the circumferential direction of the edge of the rotating disk. A first notch is provided on one side of the rib, and the first notch is used to be connected to the output end of the material receiving device. A second notch is provided on the other side of the rib, and the second notch is connected to the head end of the second conveyor belt device. The head end of the second conveyor belt device extends into the second notch and is located below the rotating disk.

9. A method for automatic printing of aluminum-plastic covers, implemented based on the automatic printing device for aluminum-plastic covers according to any one of claims 1 to 8, characterized in that: The following steps are involved: a. Add aluminum-plastic covers to the vibrating plate feeding device, and output the aluminum-plastic covers in two rows with the top surface facing upwards through the vibrating plate feeding device; b. The first conveyor belt device drives two rows of aluminum-plastic covers to move forward in sequence through the plasma treatment station, pad printing station, and heating and drying station; c. After the aluminum-plastic cover enters the plasma treatment station, the movement of the two rows of multiple aluminum-plastic covers is limited by the first limit device, the plasma treatment device is started to perform plasma treatment on the upper surface of the two rows of aluminum-plastic covers, and the first limit device releases the aluminum-plastic cover after the plasma treatment; d. Two rows of aluminum-plastic covers enter the pad printing station. The second limiting device limits the two rows of aluminum-plastic covers to the clamping device. The positioning fingers on both sides approach each other and cooperate with the second middle bar to clamp the two rows of aluminum-plastic covers in the positioning groove; e. The printing plate of the automatic pad printing device moves toward the oil pan, and at the same time, the mold mounting plate drives the printing head downward to contact the tape on the support plate. The printing head moves up, the printing plate returns to its original position, and the printing head moves down to contact the image area of ​​the printing plate to pick up ink. The printing head moves to the top of the first conveyor belt device, and the printing head moves down to print ink on the top surface of the aluminum-plastic cover; f. The clamping device opens and the second limit device releases the printed aluminum-plastic cover; g. The aluminum-plastic cover enters the heating and drying device to dry the ink on the top by heating; h. The aluminum-plastic cover enters the equally spaced conveying device through the receiving device, and is output to the second conveyor belt device at equal intervals by the equally spaced conveying device; i. The aluminum-plastic covers pass through the defect detection device at equal intervals, and the aluminum-plastic covers with printing defects are removed.

10. The automatic printing method for aluminum-plastic covers according to claim 9, characterized in that: In step d, the aluminum-plastic covers pass through the quantity control mechanism when entering the pad printing station from the plasma treatment station. The third sensor and the fourth sensor detect the number of aluminum-plastic covers passing through. After each predetermined number of aluminum-plastic covers pass through, the fourth vertical telescopic cylinder is controlled to drive the fourth lifting frame to move downward to cut off the two channels of the first conveyor belt device to prevent the aluminum-plastic covers from continuing to enter the printing station.

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