Mechanical device and method for bottle cap printing

Abstract

The bottle cap printing mechanical device comprises a center rotating disc, a delivery structure, a first printing structure and a second printing structure, a plurality of clamping assemblies are fixed to the peripheral side of the center rotating disc at intervals, and the clamping assemblies are used for clamping bottle caps; the delivery structure is arranged on the peripheral side of the center rotating disc and used for delivering the bottle caps to the clamping assemblies and comprises a bearing seat and a pushing part, and the pushing part is arranged on the peripheral side of the bearing seat and used for pushing the bottle caps on the bearing seat to the clamping assemblies; the first printing structure is arranged on the peripheral side of the center rotating disc and comprises a printing assembly, a dye shaft belt and a driving part used for pushing the printing assembly to move downwards, the dye shaft belt is arranged between the printing assembly and the clamping assembly, and when the clamping assembly is located at the printing site, the printing assembly is located over the bottle caps; the second printing structure is arranged on the peripheral side of the center rotating disc and comprises a rotating cylinder and a raw material spraying assembly, the raw material spraying assembly is arranged on the rotating inner wall, and when the clamping assembly is located at the printing point position of the second printing structure, the rotating cylinder surrounds the peripheral side of the bottle cap. Full-automatic printing of the bottle caps can be achieved, and the bottle cap printing efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bottle cap processing equipment, and in particular relates to a mechanical device and method for printing bottle caps. Background Art

[0002] The bottle cap is a structure used to seal the bottle. Bottle caps have various shapes according to different functions. In order to attract more consumers, patterns or colors are usually printed on the outer surface of the bottle cap, and a lottery QR code is laser printed on the inside of the bottle cap to increase consumers' desire to buy. Therefore, bottle cap printing processing technology is needed.

[0003] Usually, the printing on the side wall of the bottle cap, the printing on the bottom of the bottle cap and the printing on the inner wall of the bottle cap are realized in an assembly line manner using different mechanical equipment, and the bottle cap needs to be operated between various assembly lines, which is inefficient. Summary of the invention

[0004] The present invention provides a mechanical device and method for printing bottle caps, so as to solve the problem of low efficiency of bottle cap printing.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: On the one hand, the present application provides a mechanical device for printing bottle caps, comprising: A central turntable, with a plurality of clamping assemblies fixed at intervals on the circumference of the central turntable, the clamping assemblies being used to clamp bottle caps; A delivery structure, arranged on the peripheral side of the central turntable, for delivering the bottle cap to the clamping assembly, comprising a receiving seat and a pushing member, wherein the pushing member is arranged on the peripheral side of the receiving seat, for pushing the bottle cap on the receiving seat to the clamping assembly; The first printing structure is arranged on the peripheral side of the central turntable, and comprises a printing assembly, a dye shaft belt and a driving member for pushing the printing assembly downward, wherein the dye shaft belt is arranged between the printing assembly and the clamping assembly, and when the clamping assembly is located at the printing position of the first printing structure, the printing assembly is located directly above the bottle cap; The second printing structure is arranged around the central turntable and includes a rotating drum and a raw material spraying assembly. The raw material spraying assembly is connected to the inner wall of the rotating drum. When the clamping assembly is located at the printing point of the second printing structure, the rotating drum surrounds the bottle cap.

[0006] Furthermore, the delivery structure is connected to a feeding device, the feeding device includes a raw material pool and a conveying assembly, and a spiral delivery belt is fixed to the inner wall of the raw material pool; The conveying component includes a turning groove and a limiting delivery groove, one end of the limiting delivery groove is connected to the turning groove, and the other end is abutted against the receiving seat, and the end of the turning groove away from the limiting delivery groove is connected to the discharge end of the spiral conveyor belt.

[0007] Furthermore, the clamping assembly includes a clamping substrate and a mounting seat fixed on the central turntable, the clamping substrate is rotatably mounted on the mounting seat, and a driving source for driving the clamping substrate to flip is arranged on the mounting seat; A limiting cylinder is fixed on the clamping substrate, and the limiting cylinder penetrates the clamping substrate. When the bottle cap is delivered to the clamping assembly, the bottle cap is sleeved outside the limiting cylinder.

[0008] Furthermore, a material receiving box is provided below the central turntable, and a pushing cylinder is provided on the mounting seat, the pushing cylinder is aligned with the limiting cylinder, and when the clamping assembly rotates to the top of the material receiving box, the pushing cylinder pushes the bottle cap to move in the direction of leaving the limiting cylinder.

[0009] Further, the printing assembly includes a driving shaft and a printing head rotatably mounted on the end of the driving shaft; The first printing structure further includes a driving base, the driving member is arranged in the driving base, and the other end of the driving shaft is fixed on the driving base, and a return spring is arranged between the driving shaft and the driving base.

[0010] Furthermore, the printing head comprises an outer wall printing head and an inner wall printing head, the outer wall printing head and the inner wall printing head are symmetrically arranged on both sides of the driving shaft, and the diameter of the inner wall printing head is smaller than that of the outer wall printing head.

[0011] Furthermore, it also includes a main base, and tensioning rollers are arranged at both ends of the dye shaft belt, the tensioning rollers are installed on the main base, and a horizontal push piece is arranged between the tensioning roller and the main base, and the horizontal push piece is used to push the tensioning roller to move away from or close to the main base.

[0012] Furthermore, the raw material spraying assembly includes a raw material box, a middle turntable and a plurality of supply pipes, wherein the middle turntable is rotatably mounted on the raw material box and communicated with the raw material box, and one end of the plurality of supply pipes is communicated with the middle turntable and the other end is communicated with the rotating drum; The inner wall of the rotating drum is provided with a spraying port, and a limiting block is fixed on the end wall of the rotating drum. The plate surface of the clamping substrate is provided with an annular sliding groove, and the limiting block can be inserted into the annular sliding groove.

[0013] Furthermore, the second printing structure also includes a sliding rail, on which a sliding seat is slidably arranged, and the rotating drum and the raw material spraying assembly are both fixed on the sliding seat. When the sliding seat moves along the sliding rail, the rotating drum moves horizontally toward or away from the clamping assembly.

[0014] On the other hand, the present application provides a method for printing bottle caps, using the above-mentioned mechanical device for printing bottle caps, comprising the following steps: S1: The bottle caps in the raw material pool are conveyed to the conveying structure by a spiral conveying belt, and the bottle caps are transported one by one to the clamping assembly by using the conveying structure; S2: The central turntable rotates to drive the bottle cap to move below the first printing structure, and the printing assembly moves downward to press the dye shaft belt onto the outer bottom wall of the bottle cap; S3: The clamping substrate is reversed 180 degrees, and the dye shaft moves away from the clamping assembly. At the same time, the printing head rotates and presses down to print on the inner bottom wall of the bottle cap; S4: The central turntable rotates to drive the bottle cap to the point of the second printing structure, and the rotating drum moves horizontally to be sleeved outside the bottle cap. While the rotating drum rotates, the raw material spraying assembly sprays the paint to realize printing on the side wall of the bottle cap; S5: The central turntable rotates to drive the bottle cap to rotate above the receiving box, and the pushing cylinder pushes the bottle cap to fall into the receiving box, thereby completing the overall printing of the bottle cap; S6: Repeat steps S1-S5 to print the next bottle cap.

[0015] The present invention can achieve the following beneficial effects: 1. The bottle cap printing mechanical device of the present application uses a delivery device to deliver the bottle cap to the clamping assembly, and realizes the flow transportation of the bottle cap through the central turntable, and then prints the outer bottom wall and the inner bottom wall of the bottle cap through the first printing structure, and prints the side wall of the bottle cap through the second printing structure, thereby realizing the integrated printing process of the bottle cap as a whole, streamlining the procedure of bottle cap printing, and improving the efficiency of bottle cap printing; 2. A spiral conveying belt is arranged on the inner wall of the raw material pool, so that the bottle caps can be transported to the delivery structure one by one, so as to achieve the effect of delivering the bottle caps to the clamping assembly one by one, thereby completing the streamlined processing of the bottle caps; 3. An outer wall printing head and an inner wall printing head are set, and a dye shaft belt capable of horizontal sliding is set between the printing head and the clamping assembly, so that the bottle cap can be printed in one piece according to the different printing requirements of the outer bottom wall and the inner bottom wall of the bottle cap, which is simple and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 This is an overall structural diagram of a mechanical device for printing bottle caps according to the present invention; Figure 2 It is a structural schematic diagram of the feeding device and the delivery structure of the present invention; Figure 3 It is a schematic diagram of the overall structure of all structures on the base of the present invention; Figure 4 for Figure 3 The enlarged view of point A in the middle; Figure 5 for Figure 3 The enlarged view of point B in the middle; Figure 6 is a schematic diagram of a local structure of a second printing structure; Figure 7 It is a structural schematic diagram of another viewing angle for displaying the entire structure on the base of the present invention; Figure 8 It is a schematic structural diagram of the second printing structure of the present invention.

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Center turntable; 2. Clamping assembly; 21. Clamping substrate; 211. Annular slide; 22. Mounting seat; 23. Limiting cylinder; 24. Pushing cylinder; 3. Delivery structure; 31. Receiver; 32. Pusher; 4. First printing structure; 41. Printing assembly; 411. Driving shaft; 412. Outer wall printing head; 413. Inner wall printing head; 414. Reset spring; 42. Dye shaft belt; 43. Driving base; 44. Tensioning Roller; 45, horizontal pusher; 5, second printing structure; 51, rotating drum; 511, spray port; 512, limit block; 52, raw material spray assembly; 521, raw material box; 522, middle turntable; 523, supply pipeline; 53, sliding rail; 54, sliding seat; 6, loading device; 61, raw material pool; 62, conveying assembly; 621, turning slot; 622, limit delivery slot; 63, spiral delivery belt; 7, material receiving box; 8, base; 100. Bottle cap. DETAILED DESCRIPTION

[0018] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0019] like Figures 1 to 8 As shown, a mechanical device for printing bottle caps comprises a feeding device 6, a delivery structure 3, a main base 8 and a receiving box 7 which are arranged in sequence. A central turntable 1 is rotatably mounted on the main base 8, and a plurality of clamping assemblies 2 for clamping bottle caps 100 are arranged at intervals in the circumferential direction of the central turntable 1. The feeding device 6 is connected to the delivery structure 3; the delivery structure 3 is arranged on the circumferential side of the central turntable 1, and is used to deliver bottle caps 100 onto the central turntable 1; the receiving box 7 is arranged directly below the central turntable 1, and is used to receive the bottle caps 100 that have been printed.

[0020] A first printing structure 4 for printing the outer bottom wall and the inner bottom wall of the bottle cap 100 and a second printing structure 5 for printing the outer side wall of the bottle cap 100 are also provided on the circumference of the central turntable 1. In the embodiment of the present application, the outer bottom wall and the inner bottom wall of the bottle cap 100 are printed first, and then the outer side wall of the bottle cap 100 is printed. Therefore, the first printing structure 4 is arranged above the central turntable 1, and the second printing structure 5 is arranged on the side of the central turntable 1.

[0021] The feeding device 6 includes a raw material pool 61 and a conveying assembly 62. The raw material pool 61 is used to place the bottle caps 100 to be processed, and the conveying assembly 62 is used to convey the bottle caps 100 to the delivery structure 3. A spiral conveying belt 63 is fixed to the inner wall of the raw material pool 61, and the bottle caps 100 in the raw material pool 61 can be conveyed one by one along the spiral conveying belt 63 to the conveying assembly 62 through the spiral conveying belt 63. The conveying assembly 62 includes a turning groove 621 and a limiting delivery groove 622. One end of the turning groove 621 is connected to the discharge end of the spiral conveying belt 63, and the other end is connected to the limiting delivery groove 622. Since the bottom wall of the bottle cap 100 is parallel to the belt surface of the spiral conveying belt 63 when the bottle cap 100 is transported on the spiral conveying belt 63, it is not convenient to deliver the bottle cap 100 to the clamping assembly 2. Therefore, the flip groove 621 is required to flip the bottle cap 100 so that the bottom wall of the bottle cap 100 is perpendicular to the horizontal plane. After flipping the bottle cap 100 by the flip groove 621, it continues to be transported to the limiting delivery groove 622, and then transported to the delivery structure 3 through the limiting delivery groove 622.

[0022] The delivery structure 3 includes a receiving seat 31 and a pusher 32. The discharge end of the limited delivery slot 622 is flush with and connected to the receiving seat 31, so that the bottle cap 100 can be smoothly transported from the limited delivery slot 622 to the receiving seat 31; the pusher 32 is arranged on the side of the receiving seat 31, and is used to push the bottle cap 100 to the clamping assembly 2. Through the sensor or induction device, when the central turntable 1 rotates to drive a clamping assembly 2 to rotate to the side of the receiving seat 31, the pusher 32 runs and horizontally pushes the bottle cap 100 to the clamping assembly 2, so as to realize the loading of the bottle cap 100.

[0023] The clamping assembly 2 includes a mounting seat 22 fixed on the central turntable 1, and a clamping base plate 21 rotatably arranged on the mounting seat 22, a limiting cylinder 23 is fixed on the clamping base plate 21, and the outer diameter of the limiting cylinder 23 is the same as the inner diameter of the bottle cap 100; when the clamping assembly 2 is rotated to be aligned with the receiving seat 31, the limiting cylinder 23 is aligned with the receiving seat 31, and the bottle cap 100 is pushed by the pushing member 32 so that the bottle cap 100 can be sleeved on the outside of the limiting cylinder 23, thereby realizing the loading of the bottle cap 100.

[0024] Driven by the central turntable 1, the bottle cap 100 first rotates to the first printing structure 4, which includes a printing assembly 41, a dye shaft belt 42 and a driving base 43, wherein a driving member for pushing the printing assembly 41 downward is arranged in the driving base 43. The printing assembly 41 includes a driving shaft 411 and a printing head rotatably mounted at the end of the driving shaft 411, wherein the printing head includes an outer wall printing head 412 and an inner wall printing head 413, wherein the inner wall printing head 413 and the outer wall printing head 412 are symmetrically arranged on both sides of the driving shaft 411, and the outer bottom wall of the bottle cap 100 is printed by the outer wall printing head 412, and the inner bottom wall of the bottle cap 100 is printed by the inner wall printing head 413.

[0025] The dye shaft belt 42 is arranged between the clamping component 2 and the printing component 41, and tensioning rollers 44 are respectively arranged at both ends of the dye shaft belt 42. The dye shaft belt 42 is straightened by the tensioning rollers 44. The tensioning rollers 44 are installed on the main base 8, and a horizontal push piece 45 is arranged between the tensioning roller 44 and the main base 8. The horizontal push piece 45 pushes the tensioning roller 44 to move in a direction away from or close to the main base 8, thereby driving the dye shaft belt 42 to move.

[0026] At the first printing structure 4, first, the outer wall printing head 412 is located directly above the outer bottom wall of the bottle cap 100. At this time, the dye shaft belt 42 is located between the printing head and the bottle cap 100. The outer wall printing head 412 is driven by the driving member to move downward to imprint the dye shaft belt 42 on the outer bottom wall of the bottle cap 100, completing the printing of the outer bottom wall of the bottle cap 100. A reset spring 414 is also provided between the driving shaft 411 and the driving base 43. When the outer wall printing head 412 is imprinted, under the elastic restoring force of the reset spring 414, the printing head moves in a direction away from the bottle cap 100, and at the same time, the driving shaft 411 drives the printing head to rotate 180 degrees, so that the inner wall printing head 413 is located directly above the bottle cap 100.

[0027] The clamping assembly 2 also includes a driving source for driving the clamping base plate 21 to rotate relative to the mounting seat 22. The driving source controls the clamping base 8 to flip 180 degrees, so that the inner bottom wall of the bottle cap 100 faces upward, so that the inner wall printing head 413 can print the bottle cap 100. It should be noted that there is friction between the bottle cap 100 and the limiting cylinder 23, so that after the bottle cap 100 is flipped, the bottle cap 100 will not fall off the limiting cylinder 23.

[0028] The diameter of the inner wall printing head 413 is smaller than the diameter of the outer wall printing head 412, and the height of the inner wall printing head 413 is greater than the height of the outer wall printing head 412. When printing the inner bottom wall of the bottle cap 100, the horizontal pusher 45 drives the tension roller 44 to move in a direction away from the central turntable 1, so that the dye shaft belt 42 and the bottle cap 100 are staggered, and the inner wall printing head 413 can directly move down to the inside of the bottle cap 100 to print the inner bottom wall of the bottle cap 100. In this application, the printing tools of the outer bottom wall of the bottle cap 100, the inner bottom wall of the bottle cap 100 and the side wall of the bottle cap 100 are adjusted according to actual needs. For example, the outer bottom wall of the bottle cap 100 needs to be printed with a pattern, and the inner bottom wall of the bottle cap 100 needs to be laser-sprayed with a two-dimensional code. Then, when the inner wall printing head 413 sprays the two-dimensional code on the inner bottom wall of the bottle cap 100, it is not necessary to directly contact the inner bottom wall of the bottle cap 100, but for the convenience of expression, it is uniformly referred to as printing of the bottle cap 100 in this article.

[0029] After the inner bottom wall and the outer bottom wall of the bottle cap 100 are printed, the central turntable 1 continues to drive the clamping assembly 2 to rotate to the second printing structure 5. The second printing structure 5 includes a horizontally arranged sliding rail 53, and a sliding seat 54 is slidably installed on the sliding rail 53. When the sliding seat 54 moves on the sliding rail 53, the sliding seat 54 moves in a direction close to or away from the clamping assembly 2. A raw material spraying assembly 52 and a rotating drum 51 are fixed on the sliding seat 54. The raw material spraying assembly 52 includes a raw material box 521, a middle rotating disk 522 and a plurality of supply pipes 523. The raw material box 521 is fixed on the sliding seat 54. The middle rotating disk 522 is rotatably installed on the raw material box 521 and is connected to the raw material box 521; one end of the plurality of supply pipes 523 is connected to the middle rotating disk 522, and the other end is connected to the rotating drum 51; a spray port 511 is provided on the inner wall of the rotating drum 51, and the supply pipe 523 is connected to the spray port 511, so that the printing raw material in the raw material box 521 can flow into the supply pipe 523 through the middle rotating disk 522, and be transported to the spray port 511 through the supply pipe 523 for spraying.

[0030] In addition, a limit block 512 is fixed on the end wall of the rotating drum 51, and an annular groove 211 is provided on the surface of the clamping substrate 21, and the limit block 512 can be inserted into the annular groove 211. Specifically, when the clamping assembly 2 rotates to the second printing structure 5, the sliding seat 54 slides along the sliding rail 53 in the direction close to the clamping assembly 2 until the limit block 512 is inserted into the annular groove 211, and the rotating drum 51 is surrounded by the bottle cap 100. The middle turntable 522 rotates relative to the raw material box 521, thereby causing the rotating drum 51 to rotate relative to the bottle cap 100, and the printing raw material is sprayed out through the spray port 511. With the rotation of the rotating drum 51, the side wall of the bottle cap 100 can be fully printed. After the rotating drum 51 rotates one circle relative to the bottle cap 100 and completes the printing of the side wall of the bottle cap 100, the sliding seat 54 moves in the direction away from the sliding rail 53, and the printing of the side wall of the bottle cap 100 is completed.

[0031] The central turntable 1 continues to drive the bottle cap 100 to rotate to above the material receiving box 7. The clamping assembly 2 also includes a pushing cylinder 24 arranged on the mounting seat 22. The pushing cylinder 24 is aligned with the limiting cylinder 23. When the clamping assembly 2 rotates to just above the material receiving box 7, the pushing cylinder 24 pushes the bottle cap 100 to move in the direction of disengaging from the limiting cylinder 23, thereby causing the bottle cap 100 to fall into the material receiving box 7, completing all printing work on the bottle cap 100.

[0032] The present application also discloses a bottle cap printing method, using the above-mentioned bottle cap printing mechanical device, comprising the following steps: S1: conveying the bottle caps 100 in the raw material pool 61 to the conveying structure 3 by means of the spiral conveying belt 63, and transporting the bottle caps 100 one by one to the clamping assembly 2 by means of the conveying structure 3; S2: The central turntable 1 rotates to drive the bottle cap 100 to move below the first printing structure 4, and the printing assembly 41 moves downward to press the dye shaft belt 42 onto the outer bottom wall of the bottle cap 100; S3: The clamping substrate 21 is reversed, and the dye shaft belt 42 moves away from the clamping assembly 2, and the printing head rotates and presses down to realize printing on the inner bottom wall of the bottle cap 100; S4: The central turntable 1 rotates to drive the bottle cap 100 to the position of the second printing structure 5, and the rotating drum 51 moves horizontally to be sleeved outside the bottle cap 100. The rotating drum 51 rotates while the raw material spraying assembly 52 sprays the paint to realize printing on the side wall of the bottle cap 100; S5: The central turntable 1 rotates to drive the bottle cap 100 to rotate above the material receiving box 7, and the pushing cylinder 24 pushes the bottle cap 100 to fall into the material receiving box 7, thereby completing the overall printing of the bottle cap 100; S6: Repeat steps S1-S5 to print the next bottle cap 100.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanical device for printing bottle caps, characterized in that: include: A central rotating disk (1), a plurality of clamping assemblies (2) being fixed at intervals on the circumference of the central rotating disk (1), the clamping assemblies (2) being used to clamp bottle caps (100); A delivery structure (3) is arranged on the peripheral side of the central turntable (1) and is used to deliver the bottle cap (100) to the clamping assembly (2), comprising a receiving seat (31) and a pushing member (32); the pushing member (32) is arranged on the peripheral side of the receiving seat (31) and is used to push the bottle cap (100) on the receiving seat (31) onto the clamping assembly (2); A first printing structure (4) is arranged on the peripheral side of the central turntable (1), comprising a printing component (41), a dye shaft belt (42) and a driving member for pushing the printing component (41) downward, wherein the dye shaft belt (42) is arranged between the printing component (41) and the clamping component (2), and when the clamping component (2) is located at the printing position of the first printing structure (4), the printing component (41) is located directly above the bottle cap (100); The second printing structure (5) is arranged on the circumference of the central turntable (1), and comprises a rotating drum (51) and a raw material spraying assembly (52). The raw material spraying assembly (52) is connected to the inner wall of the rotating drum (51), and when the clamping assembly (2) is located at the printing point of the second printing structure (5), the rotating drum (51) surrounds the circumference of the bottle cap (100).

2. A mechanical device for printing bottle caps according to claim 1, characterized in that: The delivery structure (3) is connected to a loading device (6), the loading device (6) comprises a raw material pool (61) and a conveying assembly (62), and a spiral delivery belt (63) is fixed to the inner wall of the raw material pool (61); The conveying assembly (62) comprises a turnover groove (621) and a position-limiting delivery groove (622); one end of the position-limiting delivery groove (622) is connected to the turnover groove (621), and the other end is in contact with the receiving seat (31); and one end of the turnover groove (621) away from the position-limiting delivery groove (622) is connected to the discharge end of the spiral conveying belt (63).

3. A mechanical device for printing bottle caps according to claim 1, characterized in that: The clamping assembly (2) comprises a clamping substrate (21) and a mounting seat (22) fixed on the central turntable (1); the clamping substrate (21) is rotatably mounted on the mounting seat (22), and a driving source for driving the clamping substrate (21) to flip is provided on the mounting seat (22); A limiting cylinder (23) is fixed on the clamping substrate (21), and the limiting cylinder (23) passes through the clamping substrate (21). When the bottle cap (100) is delivered to the clamping assembly (2), the bottle cap (100) is sleeved outside the limiting cylinder (23).

4. A mechanical device for printing bottle caps according to claim 3, characterized in that: A material receiving box (7) is arranged below the central turntable (1), and a pushing cylinder (24) is arranged on the mounting seat (22). The pushing cylinder (24) is aligned with the limiting cylinder (23). When the clamping assembly (2) rotates to the position directly above the material receiving box (7), the pushing cylinder (24) pushes the bottle cap (100) to move in a direction away from the limiting cylinder (23).

5. The mechanical device for printing bottle caps according to claim 1, characterized in that: The printing assembly (41) comprises a driving shaft (411) and a printing head rotatably mounted on the end of the driving shaft (411); The first printing structure (4) further comprises a driving base (43), the driving member being arranged in the driving base (43), and the other end of the driving shaft (411) being fixed on the driving base (43), and a return spring (414) being arranged between the driving shaft (411) and the driving base (43).

6. A mechanical device for printing bottle caps according to claim 5, characterized in that: The printing head comprises an outer wall printing head (412) and an inner wall printing head (413); the outer wall printing head (412) and the inner wall printing head (413) are symmetrically arranged on both sides of the driving shaft (411), and the diameter of the inner wall printing head (413) is smaller than that of the outer wall printing head (412).

7. The mechanical device for printing bottle caps according to claim 1, characterized in that: It also includes a main base (8), and tension rollers (44) are arranged at both ends of the dye shaft belt (42). The tension roller (44) is installed on the main base (8), and a horizontal push member (45) is arranged between the tension roller (44) and the main base (8). The horizontal push member (45) is used to push the tension roller (44) to move in a direction away from or close to the main base (8).

8. The mechanical device for printing bottle caps according to claim 3, characterized in that: The raw material spraying assembly (52) comprises a raw material box (521), a middle rotating disk (522) and a plurality of supply pipes (523); the middle rotating disk (522) is rotatably mounted on the raw material box (521) and is in communication with the raw material box (521); one end of the plurality of supply pipes (523) is in communication with the middle rotating disk (522) and the other end is in communication with the rotating drum (51); The inner wall of the rotating drum (51) is provided with a spraying port (511), and a limit block (512) is fixed to the end wall of the rotating drum (51), and an annular sliding groove (211) is provided on the plate surface of the clamping base plate (21), and the limit block (512) can be inserted into the annular sliding groove (211).

9. The mechanical device for printing bottle caps according to claim 1, characterized in that: The second printing structure (5) further comprises a sliding rail (53), a sliding seat (54) being slidably arranged on the sliding rail (53), the rotating drum (51) and the raw material spraying assembly (52) being both fixed on the sliding seat (54), and when the sliding seat (54) moves along the sliding rail (53), the rotating drum (51) moves horizontally in a direction approaching or moving away from the clamping assembly (2).

10. A bottle cap printing method, using the bottle cap printing mechanical device according to any one of claims 1 to 9, comprising the following steps: S1: conveying the bottle caps (100) in the raw material pool (61) to the conveying structure (3) by means of a spiral conveying belt (63), and transporting the bottle caps (100) one by one to the clamping assembly (2) by means of the conveying structure (3); S2: the central turntable (1) rotates to drive the bottle cap (100) to move below the first printing structure (4), and the printing assembly (41) moves downward to press the dye shaft belt (42) onto the outer bottom wall of the bottle cap (100); S3: the clamping substrate (21) is reversed 180 degrees, the dye shaft belt (42) moves in a direction away from the clamping assembly (2), and the printing head is rotated and pressed downward to achieve printing on the inner bottom wall of the bottle cap (100); S4: the central rotating disk (1) rotates to drive the bottle cap (100) to move to the position of the second printing structure (5), the rotating drum (51) moves horizontally to be sleeved outside the bottle cap (100), and the raw material spraying assembly (52) sprays the paint while the rotating drum (51) rotates, thereby printing the side wall of the bottle cap (100); S5: the central turntable (1) rotates to drive the bottle cap (100) to rotate above the material receiving box (7), and the pushing cylinder (24) pushes the bottle cap (100) to fall into the material receiving box (7), thereby completing the overall printing of the bottle cap (100); S6: Repeat steps S1-S5 to print the next bottle cap (100).

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