Automatic printing equipment for metal labels

Abstract

The invention discloses automatic metal label printing equipment which comprises a workbench, a rotating disc and at least four supporting plates, and a feeding unit, a printing unit, a material fixing unit and a discharging unit are sequentially arranged on the workbench at intervals. The feeding unit comprises a rotating shaft capable of rotating in a reciprocating mode, a negative pressure suction mechanism, a first gear assembled on the rotating shaft through a one-way bearing, a transmission mechanism detachably assembled on the workbench through a mounting mechanism, a limiting plate and a lifting plate detachably and vertically assembled on the limiting plate in a sliding mode. The transmission mechanism comprises a vertical first threaded rod, a threaded sleeve detachably connected with the lifting plate, a pair of second gears and a pair of clamping components, the first gear is meshed with the second gear located on the upper portion, and when the rotating shaft rotates once in a reciprocating mode, the first gear is driven by the one-way bearing to rotate once; and the threaded sleeve pushes the lifting plate to move upwards step by step, the negative pressure suction mechanism can suck the uppermost metal bottom plate all the time, automatic feeding is achieved, and the printing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field related to label printing, and in particular to an automatic metal label printing device. Background Art

[0002] Metal signs are mainly made of aluminum and stainless steel. The surface of stainless steel has the advantage of not rusting. After screen printing, a hardener can be applied on the surface for processing. It is widely used in the construction of transportation facilities, office spaces and large public places. Now all kinds of screen printing signs have been widely used in the electronics industry and household appliances, especially after the new decoration process is adopted on the surface of various signs. It is presented to people in a delicate and elegant form with multiple colorful decorative effects, which improves the value and competitiveness of the goods.

[0003] The prior art already has a semi-automatic printing machine, which requires manual placement of the metal base plate on the pallet. The turntable drives the pallet to rotate through the printing station, the solid material station and the unloading station in sequence and then returns to the loading station. However, manual loading will result in low printing efficiency, and the manual placement of the metal base plate on the pallet requires adjusting the position for positioning, which will also reduce the printing efficiency. Therefore, it is necessary to design an automatic metal sign printing device. Summary of the invention

[0004] In view of the above technical problems, the purpose of the present invention is to overcome the problem of low printing efficiency caused by manual loading in the prior art.

[0005] In order to achieve the above-mentioned object, the present invention provides a metal label automatic printing device, comprising: a workbench, a horizontal turntable mounted on the workbench and capable of intermittent rotation, and at least four horizontal support plates evenly distributed along the circumferential direction of the turntable, wherein the workbench is equipped with a loading unit, a printing unit, a solid material unit, and a discharge unit which are arranged in sequence along the rotation direction of the turntable and correspond to the plurality of support plates;

[0006] The feeding unit includes a vertical rotating shaft whose lower end is axially connected to the workbench and can rotate reciprocatingly, a negative pressure suction mechanism mounted on the upper end of the rotating shaft, a first gear coaxially mounted on the rotating shaft through a one-way bearing, a transmission mechanism detachably mounted on the workbench through a mounting mechanism, a vertical limit plate mounted on the workbench and a lifting plate detachably and vertically slidably mounted on the limit plate, the transmission mechanism includes a vertical first threaded rod, a threaded sleeve threadedly mounted on the first threaded rod and detachably connected to the lifting plate along the axial direction of the first threaded rod, a pair of second gears symmetrically fixedly mounted at both ends of the first threaded rod, and a pair of clamping components symmetrically connected to the two ends of the first threaded rod and matched with the mounting mechanism, the first gear meshes with the second gear located above.

[0007] Preferably, the clamping member comprises a connecting arm whose middle portion is axially connected to the end of the first threaded rod and a pair of positioning rods assembled on both ends of the connecting arm and arranged away from the other set of clamping mechanisms;

[0008] The connecting arm is fixedly connected with a connecting rod which is fixedly connected with the connecting arm in another group of clamping mechanisms, and the connecting rod is provided with a sliding sleeve which is fixedly connected with the threaded sleeve.

[0009] Preferably, an annular flange is protruding from the outer wall of the threaded sleeve, and a horizontal support arm is connected to the annular flange through a hinge axis parallel to the first threaded rod. A vertical and top-open strip through-slot is penetrated through the limit plate, and the corresponding support arm passes through the strip through-slot and is connected to the lower surface of the lifting plate.

[0010] Preferably, a pair of limit blocks are fixedly arranged at the bottom of the lifting plate and can be respectively located on both sides of the corresponding support arms, one of the limit blocks is hinged with a pressure arm that can press on the support arm, and the other limit block is hinged with a second threaded rod, and a notch is penetrated at the end of the pressure arm for the second threaded rod to be rotatably inserted, and a butterfly nut that can resist on the pressure arm is threadedly sleeved on the second threaded rod.

[0011] Preferably, the lower end of the limit plate is connected to a pair of guide arms symmetrically arranged through a first mounting frame, the cross-section of the guide arm is L-shaped, and the lifting plate is penetrated by a guide groove slidably mounted on the guide arm.

[0012] Preferably, the mounting mechanism comprises a pair of positioning sleeves which are assembled on the workbench through a second mounting frame and match the two positioning rods located below, and a positioning arm which is provided with a positioning through slot which can be mounted on the two positioning rods located above, and both ends of the positioning arm are axially connected with vertical mounting bolts, and the workbench is equipped with a threaded seat which matches the mounting bolts.

[0013] Preferably, the negative pressure suction mechanism comprises a horizontal first mounting arm fixedly connected to the upper end of the rotating shaft, a vertically inverted first cylinder fixedly connected to the end of the first mounting arm away from the rotating shaft, and at least one first negative pressure suction cup mounted on the output end of the first cylinder;

[0014] The workbench is equipped with a stabilizing frame axially connected to the top of the rotating shaft, the stabilizing frame is equipped with a motor with a third gear sleeved on the output shaft, and the rotating shaft is fixedly equipped with a fourth gear meshing with the third gear.

[0015] Preferably, the printing unit includes a vertical moving mechanism mounted on the workbench through a third mounting frame, a screen printing template mounted on the output end of the vertical moving mechanism through a connecting frame, a horizontal first screw slide mounted on the output end of the vertical moving mechanism and located above the screen printing template, a vertically inverted second cylinder mounted on the moving end of the first screw slide, and a scraper mounted on the output end of the second cylinder and capable of contacting the screen printing template.

[0016] Preferably, the solid material unit comprises a horizontal second screw slide mounted on the workbench via a fourth mounting frame and a horizontal UV lamp mounted on the moving end of the second screw slide.

[0017] Preferably, the unloading unit includes a corner cylinder mounted on the workbench through a fifth mounting bracket, a conveyor belt mechanism mounted on the workbench and located on the side of the corner cylinder away from the turntable, a horizontal second mounting arm fixedly connected to the rotating end of the corner cylinder, a vertically inverted third cylinder mounted on the far side of the second mounting arm, and at least one second negative pressure suction cup mounted on the output end of the third cylinder.

[0018] According to the above technical scheme, the present invention provides an automatic metal label printing device, which has the following beneficial technical effects compared with the prior art: first, each reciprocating rotation of the rotating shaft will drive the first gear to rotate once through the one-way bearing, thereby driving the first threaded rod to rotate, so that the threaded sleeve pushes the lifting plate to move upward step by step, so that the negative pressure suction mechanism can always suck the metal bottom plate located at the top, realize automatic feeding, and improve printing efficiency;

[0019] Secondly, the transmission mechanism is removed, and the top and bottom of the first threaded rod are reversed. The spiral direction of the first threaded rod remains unchanged, and the position of the threaded sleeve is adjusted by reversing the top and bottom of the first threaded rod.

[0020] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation mode; and the parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a three-dimensional structural schematic diagram of a metal label automatic printing device provided by the present invention;

[0023] Figure 2 The present invention provides a three-dimensional structure diagram of a feeding unit of a metal label automatic printing device. Figure 1 ;

[0024] Figure 3 The present invention provides a three-dimensional structure diagram of a feeding unit of a metal label automatic printing device. Figure 2 ;

[0025] Figure 4 It is a partial three-dimensional structural schematic diagram of a feeding unit of a metal label automatic printing device provided by the present invention;

[0026] Figure 5 It is a three-dimensional structural schematic diagram of a transmission mechanism of a metal label automatic printing device provided by the present invention;

[0027] Figure 6 The invention provides a metal label automatic printing device Figure 3 The enlarged schematic diagram of point A in the middle;

[0028] Figure 7 It is a three-dimensional structural schematic diagram of a printing unit of a metal label automatic printing device provided by the present invention;

[0029] Figure 8 It is a three-dimensional structural schematic diagram of a solid material unit of a metal label automatic printing device provided by the present invention;

[0030] Fig. 9 The present invention is a schematic diagram of the three-dimensional structure of a discharge unit of a metal label automatic printing device provided by the present invention.

[0031] Description of Reference Numerals

[0032] 1. Workbench; 2. Turntable; 3. Support plate; 4. Loading unit; 5. Printing unit; 6. Solid material unit; 7. Unloading unit; 8. Rotating shaft; 9. First gear; 10. Limiting plate; 11. Lifting plate; 12. First threaded rod; 13. Threaded sleeve; 14. Second gear; 15. Positioning rod; 16. Connecting rod; 17. Sliding sleeve; 18. Annular flange; 19. Articulated shaft; 20. Support arm; 21. Limiting block; 22. Pressing arm; 23. Second threaded rod; 24. Butterfly nut; 25. First mounting bracket; 26. Guide arm; 27. The second mounting frame; 28. Positioning sleeve; 29. ​​Positioning arm; 30. Mounting bolt; 31. Threaded seat; 32. The first mounting arm; 33. The first cylinder; 34. The first negative pressure suction cup; 35. Stabilizing frame; 36. Motor; 37. The third mounting frame; 38. Vertical moving mechanism; 39. Screen printing template; 40. The first screw slide; 41. The second cylinder; 42. Scraper; 43. The second screw slide; 44. UV lamp; 45. Corner cylinder; 46. Conveyor belt mechanism; 47. The second mounting arm; 48. The third cylinder; 49. Connecting arm. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0034] In the present invention, unless otherwise stated, directional words such as "upper, lower, inside, outside" contained in a term merely represent the orientation of the term in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0035] like Figure 1-9 As shown, a metal label automatic printing device comprises: a workbench 1, a horizontal turntable 2 mounted on the workbench 1 and capable of intermittent rotation, and at least four horizontal support plates 3 evenly distributed along the circumferential direction of the turntable 2, wherein the workbench 1 is equipped with a loading unit 4, a printing unit 5, a solid material unit 6, and a discharge unit 7 which are arranged in sequence along the rotation direction of the turntable 2 and correspond to the plurality of support plates 3;

[0036] The feeding unit 4 includes a vertical rotating shaft 8 whose lower end is axially connected to the workbench 1 and can rotate reciprocatingly, a negative pressure suction mechanism mounted on the upper end of the rotating shaft 8, a first gear 9 coaxially mounted on the rotating shaft 8 through a one-way bearing, a transmission mechanism detachably mounted on the workbench 1 through a mounting mechanism, a vertical limiting plate 10 mounted on the workbench 1 and a lifting plate 11 detachably and vertically slidably mounted on the limiting plate 10, the transmission mechanism includes a vertical first threaded rod 12, a threaded sleeve 13 threadedly mounted on the first threaded rod 12 and capable of sliding along the axis of the first threaded rod 12 and detachably connected to the lifting plate 11, a pair of second gears 14 symmetrically fixedly mounted at both ends of the first threaded rod 12, and a pair of clamping components symmetrically axially connected to the two ends of the first threaded rod 12 and matched with the mounting mechanism, the first gear 9 is meshed with the second gear 14 located above.

[0037] In the above technical solution, the turntable 2 that can rotate intermittently is an existing mature technology, and its rotation principle will not be elaborated in this article.

[0038] The metal base plates are stacked on the lifting plate 11. Each time the rotating shaft 8 rotates back and forth, it will drive the first gear 9 to rotate once through the one-way bearing. The first gear 9 will drive the first threaded rod 12 to rotate through the meshing second gear 14, so that the threaded sleeve 13 will gradually move upward. The threaded sleeve 13 will push the lifting plate 11 to move upward. During the startup of the printing equipment, the lifting plate 11 moves upward intermittently, so that the negative pressure suction mechanism can always absorb the metal base plate at the top, thereby realizing automatic loading. After the turntable 2 rotates intermittently three times, the support plate 3 drives the metal base plate to pass through the printing unit 5, the solid material unit 6 and the unloading unit 7 in sequence, and can automatically print the required text, icons, etc. on the metal base plate, with high work efficiency.

[0039] When the threaded sleeve 13 moves to the top end on the first threaded rod 12, the mounting mechanism is opened, the lifting plate 11 is separated from the threaded sleeve 13, the lifting plate 11 is removed from the limit plate 10, and then the transmission mechanism is removed, the first gear 9 is separated from the corresponding second gear 14, the direction of the first threaded rod 12 is reversed, and the top and bottom of the first threaded rod 12 are reversed. At this time, the spiral direction on the first threaded rod 12 remains unchanged, because the reversal of the first threaded rod 12 will cause the position of the threaded sleeve 13 to drop, and the position of the threaded sleeve 13 is adjusted by reversing the position of the top and bottom ends of the first threaded rod 12. The second gear 14 located below before the reversal will mesh with the first gear 9, and then the transmission mechanism is fixed by the mounting mechanism, the lifting plate 11 is vertically slidably assembled on the limit plate 10, and then the threaded sleeve 13 and the lifting plate 11 are assembled together, and the stacked metal base plates are placed on the lifting plate 11. When the printing equipment is started again, the threaded sleeve 13 will drive the lifting plate 11 to move upward for feeding.

[0040] In a preferred embodiment of the invention, the clamping member comprises a connecting arm 49 whose middle part is axially connected to the end of the first threaded rod 12 and a pair of positioning rods 15 assembled on both ends of the connecting arm 49 and arranged away from the other set of clamping mechanisms;

[0041] The connecting arm 49 is fixedly connected with a connecting rod 16 which is fixedly connected with the connecting arm 49 in another set of clamping mechanisms. The connecting rod 16 is slidably sleeved with a sliding sleeve 17 which is fixedly connected with the threaded sleeve 13 .

[0042] In the above technical solution, because the two ends of the first threaded rod 12 need to be rotated, the components on both ends of the first threaded rod 12 are arranged in a symmetrical state, and the assembly of the transmission mechanism will not be affected after the position is rotated; when the first threaded rod 12 rotates, it will drive the threaded sleeve 13 to move along the axial direction of the first threaded rod 12, and the threaded sleeve 13 drives the sliding sleeve 17 to slide upward on the connecting rod 16.

[0043] In a preferred embodiment of the invention, an annular flange 18 is protruding from the outer wall of the threaded sleeve 13, and a horizontal support arm 20 is connected to the annular flange 18 via a hinge shaft 19 parallel to the first threaded rod 12. A vertical and top-open strip-shaped through groove is penetrated through the limit plate 10, and the corresponding support arm 20 passes through the strip-shaped through groove and is connected to the lower surface of the lifting plate 11.

[0044] In the above technical solution, the corresponding support arm 20 will pass through the strip-shaped through groove and be connected to the lower surface of the lifting plate 11, but the other support arm 20 will overlap with the first gear 9 in position, which will affect the disassembly and assembly of the transmission mechanism, so the support arm 20 is assembled on the annular flange 18 through the hinge shaft 19. During disassembly and assembly, the corresponding support arm 20 can be rotated around the hinge shaft 19 to be misaligned with the first gear 9.

[0045] In a preferred embodiment of the invention, a pair of limit blocks 21 are fixedly arranged at the bottom of the lifting plate 11 and can be respectively located on both sides of the corresponding support arms 20, one of the limit blocks 21 is hinged with a pressure arm 22 that can be pressed on the support arm 20, and the other limit block 21 is hinged with a second threaded rod 23, and a notch is penetrated at the end of the pressure arm 22 for the second threaded rod 23 to be rotatably inserted, and a butterfly nut 24 that can resist the pressure arm 22 is threadedly sleeved on the second threaded rod 23.

[0046] In the above technical solution, when it is necessary to separate the support arm 20 from the lifting plate 11, loosen the butterfly nut 24 so that the second threaded rod 23 can be rotated and moved out of the notch, and the lifting plate 11 is slid upward to separate the lifting plate 11 from the connecting arm 49; during assembly, the connecting arm 49 will be inserted between the two limit blocks 21, and the pressing arm 22 will be rotated and pressed on the connecting arm 49, and then the pressing arm 22 will be tightly pressed on the bottom of the connecting arm 49 by the second threaded rod 23 and the butterfly nut 24.

[0047] In a preferred embodiment of the invention, the lower end of the limit plate 10 is connected to a pair of guide arms 26 symmetrically arranged through a first mounting frame 25, the cross-section of the guide arms 26 is L-shaped, and the lifting plate 11 is penetrated by a guide groove slidably mounted on the guide arms 26.

[0048] In the above technical solution, by moving the lifting plate 11 upward, the lifting plate 11 can be slid off the upper end of the guide arm 26. During assembly, the guide groove is sleeved on the upper end of the guide arm 26, and the lifting plate 11 can be vertically slidably sleeved on a pair of guide arms 26. The cross-section of the guide arm 26 is L-shaped, which can position the corner of the metal base plate. In conjunction with the limit plate 10, it can prevent the stacked metal base plates from tilting and displacing.

[0049] In a preferred embodiment of the invention, the mounting mechanism includes a pair of positioning sleeves 28 assembled on the workbench 1 through a second mounting frame 27 and matching the two positioning rods 15 located below, and a positioning arm 29 having a positioning through groove that can be mounted on the two positioning rods 15 located above, and vertical mounting bolts 30 are axially connected to both ends of the positioning arm 29, and a threaded seat 31 matching the mounting bolts 30 is assembled on the workbench 1.

[0050] In the above technical solution, when the transmission mechanism needs to be removed, loosen the mounting bolts 30 and separate them from the threaded seat 31, separate the positioning arm 29 upward from the corresponding positioning rod 15, and lift the transmission mechanism vertically upward, so that the two positioning rods 15 located at the bottom can be moved out from the corresponding positioning sleeves 28; after reversing the position, insert the two positioning rods 15 located at the bottom at this time into the two positioning sleeves 28 at the bottom, and set the two positioning grooves on the positioning arm 29 on the two positioning rods 15 located at this time on the top, and connect the threaded sleeve 13 and the positioning arm 29 together by mounting the bolts 30.

[0051] In a preferred embodiment of the invention, the negative pressure suction mechanism includes a horizontal first mounting arm 32 fixedly connected to the upper end of the rotating shaft 8, a vertically inverted first cylinder 33 fixedly connected to the end of the first mounting arm 32 away from the rotating shaft 8, and at least one first negative pressure suction cup 34 mounted on the output end of the first cylinder 33;

[0052] The workbench 1 is equipped with a stabilizing frame 35 axially connected to the top of the rotating shaft 8 , and the stabilizing frame 35 is equipped with a motor 36 with a third gear sleeved on the output shaft, and the rotating shaft 8 is fixedly equipped with a fourth gear meshing with the third gear.

[0053] In the above technical scheme, the motor 36 drives the rotating shaft 8 to rotate reciprocatingly through the third gear and the fourth gear, and the rotating shaft 8 drives the first mounting arm 32 to rotate reciprocatingly; when the first cylinder 33 is located above the lifting plate 11, the output end of the first cylinder 33 moves downward, driving the first negative pressure suction cup 34 to absorb the metal base plate located at the top, and the motor 36 starts, driving the first cylinder 33 to rotate around the axis of the rotating shaft 8, driving the first cylinder 33 to move to the top of the corresponding support plate 3, and the output end of the first cylinder 33 moves downward, so that the metal base plate contacts the support plate 3, and the first negative pressure suction cup 34 releases the metal base plate, completing the automatic loading of the metal base plate.

[0054] In a preferred embodiment of the invention, the printing unit 5 includes a vertical moving mechanism 38 assembled on the workbench 1 through a third mounting frame 37, a screen printing template 39 assembled on the output end of the vertical moving mechanism 38 through a connecting frame, a horizontal first screw slide 40 assembled on the output end of the vertical moving mechanism 38 and located above the screen printing template 39, a vertically inverted second cylinder 41 assembled on the moving end of the first screw slide 40, and a scraper 42 assembled on the output end of the second cylinder 41 and capable of contacting the screen printing template 39.

[0055] In the above technical scheme, the vertical moving mechanism 38 is an existing mature technology, and its structure and principle will not be elaborated in this article. The turntable 2 rotates, driving the support plate 3 to move from the station of the loading unit 4 to the station of the printing unit 5. The output end of the vertical moving mechanism 38 drives the first screw slide 40 to move vertically downward, so that the screen printing template 39 is attached to the metal base plate. The first screw slide 40 drives the scraper 42 to move horizontally, scraping the ink to move, and printing the corresponding pattern text on the metal base plate.

[0056] In a preferred embodiment of the invention, the solid material unit 6 includes a horizontal second screw slide 43 mounted on the workbench 1 through a fourth mounting frame and a horizontal UV lamp 44 mounted on the moving end of the second screw slide 43 .

[0057] In the above technical solution, after the turntable 2 rotates, the printed metal base plate will move to the workstation corresponding to the solid material unit 6. The irradiation of the UV lamp 44 can increase the bonding force between the ink and the metal base plate. The second screw slide 43 will drive the UV lamp 44 to move horizontally, so that the upper surface of the metal base plate can be irradiated by the UV lamp 44.

[0058] In a preferred embodiment of the invention, the unloading unit 7 includes a corner cylinder 45 assembled on the workbench 1 through a fifth mounting frame, a conveyor belt mechanism 46 assembled on the workbench 1 and located on the side of the corner cylinder 45 away from the turntable 2, a horizontal second mounting arm 47 fixedly connected to the rotating end of the corner cylinder 45, a vertically inverted third cylinder 48 assembled on the far side of the second mounting arm 47, and at least one second negative pressure suction cup assembled on the output end of the third cylinder 48.

[0059] In the above technical solution, when the third cylinder 48 is located directly above the pallet 3, the output end of the third cylinder 48 drives the second negative pressure suction cup to absorb the printed metal base plate located on the pallet 3, and the output end of the third cylinder 48 moves upward to separate the metal base plate from the pallet 3. The corner cylinder 45 starts to drive the second mounting arm 47 to rotate, driving the third cylinder 48 to move to the top of the conveyor belt mechanism 46, and the third cylinder 48 moves vertically downward, the second negative pressure suction cup releases the metal base plate, and the printed metal base plate will be transported away by the conveyor belt mechanism 46.

[0060] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0061] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0062] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A metal label automatic printing device, characterized in that: include: A workbench (1), a horizontal turntable (2) mounted on the workbench (1) and capable of intermittent rotation, and at least four horizontal support plates (3) evenly distributed along the circumference of the turntable (2); the workbench (1) is equipped with a loading unit (4), a printing unit (5), a solid material unit (6), and a discharge unit (7) which are arranged in sequence along the rotation direction of the turntable (2) and correspond to the plurality of support plates (3); The feeding unit (4) comprises a vertical rotating shaft (8) whose lower end is axially connected to the workbench (1) and can rotate reciprocatingly, a negative pressure suction mechanism mounted on the upper end of the rotating shaft (8), a first gear (9) mounted on the rotating shaft (8) coaxially through a one-way bearing, a transmission mechanism detachably mounted on the workbench (1) through a mounting mechanism, a vertical limiting plate (10) mounted on the workbench (1) and a lifting plate (11) detachably and vertically slidably mounted on the limiting plate (10), the transmission mechanism comprising a vertical first threaded rod (12), a threaded sleeve (13) threadedly sleeved on the first threaded rod (12) and detachably connected to the lifting plate (11) and capable of sliding along the axis of the first threaded rod (12), a pair of second gears (14) symmetrically fixedly sleeved on both ends of the first threaded rod (12) and a pair of clamping components symmetrically axially connected to both ends of the first threaded rod (12) and matched with the mounting mechanism, the first gear (9) meshing with the second gear (14) located above.

2. The metal label automatic printing device according to claim 1, characterized in that: The clamping member comprises a connecting arm (49) whose middle part is axially connected to the end of the first threaded rod (12) and a pair of positioning rods (15) assembled on both ends of the connecting arm (49) and arranged away from another set of clamping mechanisms; The connecting arm (49) is fixedly connected to a connecting rod (16) fixedly connected to a connecting arm (49) in another group of clamping mechanisms, and a sliding sleeve (17) fixedly connected to a threaded sleeve (13) is provided on the connecting rod (16).

3. The metal label automatic printing device according to claim 1, characterized in that: An annular flange (18) is protruding from the outer wall of the threaded sleeve (13), and a horizontal support arm (20) is connected to the annular flange (18) via a hinge shaft (19) parallel to the first threaded rod (12). A vertical strip-shaped through groove with an open top is penetrated through the limit plate (10), and the corresponding support arm (20) passes through the strip-shaped through groove and is connected to the lower surface of the lifting plate (11).

4. The metal label automatic printing device according to claim 3, characterized in that: A pair of limit blocks (21) are fixedly arranged at the bottom of the lifting plate (11) and can be respectively located on both sides of the corresponding support arms (20), one of the limit blocks (21) is hingedly provided with a pressure arm (22) that can be pressed on the support arm (20), and the other limit block (21) is hingedly provided with a second threaded rod (23), and a notch is penetrated at the end of the pressure arm (22) for the second threaded rod (23) to be rotatably inserted, and a butterfly nut (24) that can abut against the pressure arm (22) is threadedly sleeved on the second threaded rod (23).

5. The metal label automatic printing device according to claim 1, characterized in that: The lower end of the limit plate (10) is connected to a pair of guide arms (26) arranged in a symmetrical state through a first mounting frame (25); the cross section of the guide arms (26) is L-shaped; and the lifting plate (11) is penetrated by a guide groove which is slidably mounted on the guide arms (26).

6. The metal label automatic printing device according to claim 2, characterized in that: The mounting mechanism comprises a pair of positioning sleeves (28) mounted on the workbench (1) through a second mounting frame (27) and matching with two positioning rods (15) located below, and a positioning arm (29) having a positioning through slot extending therethrough and capable of being mounted on the two positioning rods (15) located above, both ends of the positioning arm (29) being axially connected with vertical mounting bolts (30), and a threaded seat (31) matching with the mounting bolts (30) being mounted on the workbench (1).

7. The metal label automatic printing device according to claim 1, characterized in that: The negative pressure suction mechanism comprises a horizontal first mounting arm (32) fixedly connected to the upper end of the rotating shaft (8), a vertically inverted first cylinder (33) fixedly connected to the end of the first mounting arm (32) away from the rotating shaft (8), and at least one first negative pressure suction cup (34) mounted on the output end of the first cylinder (33); The workbench (1) is equipped with a stabilizing frame (35) axially connected to the top of the rotating shaft (8), the stabilizing frame (35) is equipped with a motor (36) with a third gear sleeved on the output shaft, and the rotating shaft (8) is fixedly equipped with a fourth gear meshing with the third gear.

8. The metal label automatic printing device according to claim 1, characterized in that: The printing unit (5) comprises a vertical moving mechanism (38) mounted on the workbench (1) via a third mounting frame (37), a screen printing template (39) mounted on the output end of the vertical moving mechanism (38) via a connecting frame, a horizontal first screw slide (40) mounted on the output end of the vertical moving mechanism (38) and located above the screen printing template (39), a vertically inverted second cylinder (41) mounted on the moving end of the first screw slide (40), and a scraper (42) mounted on the output end of the second cylinder (41) and capable of contacting the screen printing template (39).

9. The metal label automatic printing device according to claim 1, characterized in that: The solid material unit (6) comprises a horizontal second screw slide (43) mounted on the workbench (1) via a fourth mounting frame and a horizontal UV lamp (44) mounted on the moving end of the second screw slide (43).

10. The metal label automatic printing device according to claim 1, characterized in that: The unloading unit (7) comprises a corner cylinder (45) mounted on the workbench (1) via a fifth mounting frame, a conveyor belt mechanism (46) mounted on the workbench (1) and located on a side of the corner cylinder (45) away from the turntable (2), a horizontal second mounting arm (47) fixedly connected to the rotating end of the corner cylinder (45), a vertically inverted third cylinder (48) mounted on the far side of the second mounting arm (47), and at least one second negative pressure suction cup mounted on the output end of the third cylinder (48).

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