A seal device capable of covering color graphics

Abstract

The present application discloses a kind of steel seal device capable of covering color graphics, aims at solving the steel seal currently used can only cover the raised text, numbers and patterns, but there is no color deficiency.The application includes rack and oil storage cylinder, piston is installed in the oil storage cylinder, pressure chamber is formed below the piston in the oil storage cylinder, driving mechanism is installed on the rack, driving mechanism drives the lifting movement of oil storage cylinder and piston, seal negative mold and oil storage pad are installed at the lower end of the oil storage cylinder, oil storage pad is placed on the upper surface of seal negative mold, and capillary hole is provided on the seal negative mold;Oil storage cylinder and piston move downward, the pressure in pressure chamber increases, oil storage cylinder and piston move upward, and the pressure in pressure chamber decreases.The steel seal device of the present application not only can cover the raised text, numbers and patterns, but also can make the printed text, numbers and patterns have color, so as to print color 3D graphics seal.

Description

Technical Field

[0001] This invention relates to the field of seal technology, and more specifically, to a steel stamp device capable of affixing colored images and text. Background Technology

[0002] A steel seal is an imprint consisting of two molds, one for positive and one for negative, engraved on a metal body. It is typically stamped on specialized documents or photographs and is an important tool used by government and other authoritative institutions to authenticate certificates, documents, and papers. Due to the limitations of steel seals, the seal body is primarily made of rigid metals such as stainless steel and brass. Traditional steel seals have a complex structure, and the negative mold cannot be evenly coated with ink like a regular seal, thus only colorless steel seals can be used. Therefore, currently used steel seals can only stamp raised text, numbers, and patterns, but not with ink. Summary of the Invention

[0003] To overcome the above shortcomings, the present invention provides a stamping device capable of stamping colored images and text, which can print colored 3D image and text seals.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a steel stamping device capable of stamping colored graphics, comprising a frame and an oil storage cylinder, a piston installed inside the oil storage cylinder, a pressure-changing chamber formed below the piston inside the oil storage cylinder, a drive mechanism installed on the frame, the drive mechanism driving the oil storage cylinder and the piston to move up and down, a stamp negative mold and an oil storage pad installed at the lower end of the oil storage cylinder, the oil storage pad being placed on the upper surface of the stamp negative mold, the stamp negative mold being provided with capillary pores; when the oil storage cylinder and the piston move downward, the pressure in the pressure-changing chamber increases, and when the oil storage cylinder and the piston move upward, the pressure in the pressure-changing chamber decreases.

[0005] Before using the stamping device, ink is injected into the pressure-changing chamber to saturate the ink reservoir. When the device is operational, the drive mechanism moves the ink reservoir and piston downwards. This movement of the reservoir and piston reduces the pressure in the pressure-changing chamber, increasing the air pressure. The ink on the reservoir is forced downwards by this air pressure, seeping through the capillaries into the surface of the stamp die. The stamp die, along with the reservoir, is pressed downwards, thus printing a colored 3D image. After printing, the drive mechanism returns to its original position, moving the ink reservoir and piston upwards. This movement of the reservoir and piston increases the pressure in the pressure-changing chamber, reducing the air pressure and maintaining a low pressure to prevent ink seepage.

[0006] The stamping device of the present invention can not only stamp raised text, numbers and patterns, but also make the printed text, numbers and patterns colored, thereby printing a colored 3D graphic stamp.

[0007] Preferably, a pressure relief hole is provided on the piston, and the pressure relief hole is connected to a one-way pressure relief valve.

[0008] The one-way pressure relief valve controls the working air pressure of the pressure regulating chamber, thereby controlling the rate at which ink seeps down into the chamber. This prevents excessively high working air pressure from causing the ink to seep down too quickly, resulting in blurry printed images. The one-way pressure relief valve ensures clear printed images.

[0009] Preferably, a stamp ring is detachably connected to the lower end of the oil reservoir, and the stamp negative mold and the oil reservoir pad are both securely connected to the stamp ring.

[0010] The stamp ring design facilitates the installation of the stamp negative and the oil reservoir. The stamp ring is detachable; when a different size stamp negative needs to be replaced, simply replace it with a stamp ring of a different size to fit the stamp negative, making it flexible and convenient.

[0011] Preferably, a positioning protrusion is provided on the stamp ring, and a positioning groove is provided at the lower end of the oil reservoir, with the positioning protrusion installed in the positioning groove.

[0012] The positioning protrusions and grooves ensure the precise installation of the stamp ring and the oil reservoir. Furthermore, the positioning protrusions act as a positioning element after the stamp ring is installed, preventing it from deflecting.

[0013] Preferably, a base is provided on the frame, and a mold sleeve is detachably connected to the base. The mold sleeve is adapted to connect to the positive mold of the stamp, and the positive mold of the stamp and the negative mold of the stamp are set accordingly.

[0014] The positive mold for the seal is installed in the mold sleeve, ensuring precise and reliable positioning. When it is necessary to change to a different size positive mold, simply replace it with a mold sleeve of a different size to fit the positive mold, making it flexible and convenient.

[0015] Preferably, the oil storage tank is provided with a guide groove, and the frame is provided with a guide rail, with the guide groove and the guide rail being slidably connected.

[0016] During the lifting and lowering process, the guide groove slides along the guide rail to prevent the oil reservoir from shifting during the lifting and lowering process, thus ensuring the accuracy of the stamping position.

[0017] Preferably, the drive mechanism includes a drive rod, a drive gear mounted on the drive rod, a push-pull rod connected to the piston, a first rack on the oil reservoir, a second rack on the push-pull rod, a first gear set for transmission between the drive gear and the first rack, and a second gear set for transmission between the drive gear and the second rack.

[0018] Pressing the drive rod downwards causes the drive gear to rotate, which in turn drives the first rack to move downwards via the first gear set. The oil reservoir moves downwards along with the first rack, thus performing the stamping operation.

[0019] The second gear set drives the second rack to move downwards, and the push-pull rod moves downwards together with the second rack. The downward speed of the push-pull rod is greater than the downward speed of the oil reservoir, which reduces the size of the pressure chamber and increases the air pressure, making it easier for printing oil to seep out.

[0020] Preferably, the pressure inside the transformer chamber in the initial state is... P2 is the air pressure inside the transformer chamber during operation; h1 is the initial height of the transformer chamber; x1 is the total transmission ratio of the first gear set; x2 is the total transmission ratio of the second gear set; the first gear set includes several first transmission gears, and the diameter of the first transmission gear meshing with the first rack is d1; the second gear set includes several second transmission gears, and the diameter of the second transmission gear meshing with the second rack is d2.

[0021] Based on the above formula, the speed ratio of the piston and the oil reservoir is controlled, thereby controlling the initial air pressure in the pressure transformer chamber. This reduces the air pressure in the chamber to 0.05MPa-0.07MPa. The negative pressure in the chamber draws back excess ink from the stamp die, preventing further seepage. During operation, the air pressure in the chamber is controlled between 0.14MPa and 0.3MPa, which is the maximum air pressure in the chamber. This pressure is adjusted and controlled by a one-way pressure relief valve.

[0022] Preferably, a return torsion spring is installed between the drive gear and the frame.

[0023] The reset torsion spring facilitates the return of the drive mechanism after the stamp is applied.

[0024] Preferably, an oil injection hole is provided on the side wall of the oil storage tank.

[0025] Ink is added through the ink injection hole, allowing the stamp to be reused continuously.

[0026] Compared with the prior art, the beneficial effects of the present invention are: (1) The steel stamping device of the present invention can not only stamp raised text, numbers and patterns, but also make the printed text, numbers and patterns colored, thereby printing a colored 3D graphic seal; (2) When the steel stamping device stamps, the air pressure in the pressure-transforming chamber increases, and the ink on the oil storage pad seeps down under the action of air pressure, thereby printing a colored 3D graphic seal; after printing is completed, the air pressure in the pressure-transforming chamber decreases, so that the pressure-transforming chamber is kept at a low pressure to prevent the ink from seeping down; (3) The maximum working air pressure in the pressure-transforming chamber can be adjusted and controlled, thereby controlling the seepage speed of the ink in the pressure-transforming chamber, avoiding the working air pressure being too high, which would cause the ink to seep down too fast, and thus cause the printed graphics to be blurry. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a cross-sectional view of the present invention;

[0029] Figure 3 This is an exploded view of the present invention;

[0030] Figure 4 This is a schematic diagram of the one-way pressure relief valve of Embodiment 2 of the present invention;

[0031] In the diagram: 1. Frame, 2. Oil reservoir, 3. Piston, 4. Transformer chamber, 5. Oil injection hole, 6. Stamp negative mold, 7. Oil reservoir pad, 8. Capillary hole, 9. Indentation, 10. Pressure relief hole, 11. Drive rod, 12. Drive gear, 13. Push-pull rod, 14. Top cover, 15. First rack, 16. Second rack, 17. Connecting shaft, 18. Clearance groove, 19. Positioning plate, 20. Guide groove, 21. Guide rail, 22. Gear A, 23. Gear B, 24. Gear C, 25. First transition gear, 26. Gear D, 27. Gear E, 28. Gear F, 29. Second transition gear 30. Gear, 31. Stamp ring, 32. Support flange, 33. Support boss, 34. Connecting ring, 35. Positioning protrusion, 36. Positioning groove, 37. Clamping plate, 38. Base, 39. Mold sleeve, 40. Stamp male mold, 41. Raised mark, 42. Positioning groove, 43. Clamping protrusion, 44. Locking groove, 45. Limiting protrusion, 46. Limiting groove, 47. Valve body, 48. Valve cavity, 49. Valve disc, 50. Sealing surface, 51. Adjusting column, 52. Vent hole, 53. Preload spring, 54. Pressure relief groove, 55. Positioning hole, 56. Positioning rod, 57. Sealing gasket, 58. Handle. Detailed Implementation

[0032] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0033] Example 1: A steel stamping device capable of affixing color graphics (see attached document) Figure 1 To be continued Figure 3 The system includes a frame 1 and an oil reservoir 2. A piston 3 is installed inside the oil reservoir 2. Both the piston 3 and the oil reservoir 2 are cylindrical. A sealing ring is installed on the outer wall of the piston 3. A pressure-changing chamber 4 is formed below the piston 3 inside the oil reservoir 2. An oil injection hole 5 is provided on the side wall of the oil reservoir 2, located above the pressure-changing chamber 4. A drive mechanism is installed on the frame 1, which drives the oil reservoir 2 and the piston 3 to move up and down. A stamp die 6 and an oil storage pad 7 are installed at the lower end of the oil reservoir 2. The oil storage pad 7 is placed on the upper surface of the stamp die 6, which has capillary pores 8. A groove 9 is provided on the lower surface of the stamp die 6, and the capillary pores 8 are located on the bottom surface of the groove 9. The lifting speed of the oil reservoir 2 is greater than that of the piston 3. When the oil reservoir 2 and the piston 3 move downwards and move closer to each other, the pressure in the pressure-changing chamber 4 increases. When the oil reservoir 2 and the piston 3 move upwards and move away from each other, the pressure in the pressure-changing chamber 4 decreases. The piston 3 is provided with a pressure relief hole 10, which is connected to a one-way pressure relief valve.

[0034] The drive mechanism includes a drive rod 11, on which a drive gear 12 is mounted. The drive gear 12 is rotatably mounted on the frame 1. A push-pull rod 13 is connected to the piston 3. A cover 14 is provided at the upper end of the oil reservoir 2. The push-pull rod 13 movably passes through the cover 14. The cross-section of the push-pull rod 13 is "D" shaped. A through hole adapted to the push-pull rod 13 is provided on the cover 14, through which the push-pull rod 13 passes. A first rack 15 is provided on the oil reservoir 2, and a second rack 16 is provided on the push-pull rod 13. A first gear set is connected between the drive gear 12 and the first rack 15, and a second gear set is connected between the drive gear 12 and the second rack 16. A return torsion spring is installed between the drive gear 12 and the frame 1. The return torsion spring facilitates the return of the drive mechanism after the stamp is printed. Two drive gears 12 are provided. One drive gear 12 is connected to the first rack 15 through the first gear set. The other drive gear 12 is connected to the second rack 16 through the second gear set. The two drive gears 12 are connected by a connecting shaft 17, which is rotatably connected to the frame 1. The drive rod 11 is fastened to the connecting shaft 17. A clearance groove 18 is provided on the frame 1 corresponding to the drive rod 11. The drive rod 11 passes through the clearance groove 18, and a positioning plate 19 is detachably connected to the upper end of the clearance groove 18. Rotating the drive rod 11 upwards to the end of the positioning plate 19 indicates that it has reached the correct position. After removing the positioning plate 19, the drive rod 11 is rotated upwards until it abuts against the upper end of the clearance groove 18. At this point, the oil injection hole 5 connects to the transformer chamber 4, and printing oil is added to the transformer chamber 4 through the oil injection hole 5. The oil reservoir 2 has two guide grooves 20, and the frame 1 has two guide rails 21. The two guide grooves 20 are slidably connected to the two guide rails 21 respectively.

[0035] Initial pressure in transformer chamber 4 P2 is the air pressure inside the pressure-transforming chamber 4 during operation; h1 is the initial height of the pressure-transforming chamber 4; x1 is the total transmission ratio of the first gear set; x2 is the total transmission ratio of the second gear set; the first gear set includes several first transmission gears, and the diameter of the first transmission gear meshing with the first rack 15 is d1; the second gear set includes several second transmission gears, and the diameter of the second transmission gear meshing with the second rack 16 is d2. Based on the above formulas, the speed ratio of the piston 3 and the oil reservoir 2 is controlled, thereby controlling the initial air pressure inside the pressure-transforming chamber 4, reducing the air pressure inside the pressure-transforming chamber 4 to 0.05MPa-0.07MPa. The negative pressure inside the pressure-transforming chamber 4 can draw back excess ink from the stamp negative mold 6, preventing further ink seepage. During operation, the air pressure inside the pressure-transforming chamber 4 is controlled between 0.14MPa and 0.3MPa, which is the maximum air pressure inside the pressure-transforming chamber 4, and is adjusted and controlled by a one-way pressure relief valve.

[0036] Both the first and second transmission gears are rotatably mounted on the frame 1. There are three first transmission gears: gear A22, gear B23, and gear C24. Gear A22 meshes between the driving gear 12 and gear B23. Gear C24 is coaxially connected to a first transition gear 25. Gear B23 meshes between gear A22 and the first transition gear 25. Gear C24 meshes with a first rack 15.

[0037] The second transmission gear consists of three gears: D26, E27, and F28. Gear D26 meshes between the driving gear 12 and gear E27. Gear F28 is coaxially connected to the second transition gear 29. Gear E27 meshes between gear D26 and the second transition gear 29. Gear F28 meshes with the second rack 16.

[0038] A detachable stamp ring 30 is installed at the lower end of the oil reservoir 2, and a sealing ring is installed between the outer wall of the stamp ring 30 and the inner wall of the oil reservoir 2. The stamp die 6 and the oil reservoir pad 7 are both securely connected to the stamp ring 30. A support flange 31 is located near the lower end of the inner wall of the stamp ring 30, and a support boss 32 is located on the outer edge of the stamp die 6. The stamp die 6 is supported on the support flange 31 of the stamp ring 30 by the support boss 32. Sealant is applied to the support boss 32 before it is connected to the support flange 31 to ensure a tight seal. A connecting ring 33 is located on the edge of the oil reservoir pad 7, and the connecting ring 33 is threadedly connected to the inner wall of the stamp ring 30. The support boss 32 is tightly clamped between the connecting ring 33 and the support flange 31. A positioning protrusion 34 is provided on the stamp ring 30, and a positioning groove 35 is provided at the lower end of the oil reservoir 2, in which the positioning protrusion 34 is installed. A T-shaped slot is provided at the opening of the positioning groove 35. The slot is adapted to connect a T-shaped card plate 36. The card plate 36 abuts against the positioning protrusion 34 to achieve fastening of the positioning protrusion 34. A sealing ring is installed between the outer wall of the stamp ring 30 and the inner wall of the oil reservoir 2.

[0039] A base 37 is mounted on the frame 1, and a mold sleeve 38 is detachably connected to the base 37. The mold sleeve 38 is adapted to connect to a positive stamp mold 39, which corresponds to a negative stamp mold 6. The positive stamp mold 39 has a raised mark 40, which corresponds to a recess 9 on the negative stamp mold 6. A positioning groove 41 is provided on the base 37, and the mold sleeve 38 is adapted to connect with the positioning groove 41. A locking protrusion 42 is provided on the side wall of the positioning groove 41, and a locking groove 43 is provided on the outer wall of the mold sleeve 38. The locking protrusion 42 and the locking groove 43 are adapted to connect and achieve positioning of the mold sleeve 38. A limiting protrusion 44 is provided on the inner wall of the mold sleeve 38, and a limiting groove 45 is provided on the outer wall of the positive stamp mold 39. The limiting protrusion 44 and the limiting groove 45 are adapted to connect and achieve positioning of the positive stamp mold 39.

[0040] In this embodiment, a base 37 with a length of 120mm, a width of 60mm, and a thickness of 10mm is selected. A circular positioning groove 41 with a diameter of 55mm and a depth of 5mm is opened on the right side of the center of the base 37. A mold sleeve 38 with an inner diameter of 45mm is installed inside the positioning groove 41 to hold the stamp positive mold 39. The middle part of the frame 1 is generally hollowed out for assembling the drive mechanism. A top cover 14 is provided at the upper end of the oil reservoir 2 to limit the piston 3. The push-pull rod 13 passes through a through hole in the top cover 14.

[0041] The oil reservoir 2 has an outer diameter of 55mm, an inner diameter of 50mm, and a height of 60mm. Three grooves are cut on one side of the oil reservoir 2; two narrow grooves, each 2mm wide, serve as guide grooves 20. Two guide rails 21 on the frame 1 are slidably connected to the two guide grooves 20 on the oil reservoir 2. A first rack 15, 50mm long, is mounted on one of the wider grooves. The oil reservoir 2 contains a piston 3, an oil reservoir pad 7 ring, a stamp ring 30, and a stamp die 6. The oil reservoir 2 is then mounted on the frame 1, and it moves up and down on the frame 1.

[0042] The frame 1 houses a first gear set and a second gear set. The total transmission ratio x1 of the first gear set is 1:4. The driving gear 12, meshing with the first gear set, has a diameter of 20mm. Gears A22, B23, and C24 all have diameters of 10mm, and the first intermediate gear 25 has a diameter of 5mm. The drive rod 11 and the two driving gears 12 are fixed to the connecting shaft 17, which is rotatably mounted on the frame 1. The drive rod 11 presses downwards, causing the connecting shaft 17 to rotate, which in turn drives the driving gears 12. The drive rod 11 rotates 90 degrees counterclockwise downwards, causing the first gear set to rotate. The first intermediate gear 25 rotates 360 degrees clockwise, and gear C24 rotates 360 degrees clockwise, causing the oil reservoir 2 to move downwards for approximately 30mm. When the oil reservoir 2 reaches the bottom, the negative mold 6 and the positive mold 39 of the stamp engage, stamping the seal.

[0043] The total transmission ratio x2 of the second gear set is 1:6.5. The diameter of the driving gear 12 that meshes with the second gear set is 20mm, the diameter of the second transition gear 29 is 3mm, and the diameters of gears D26, E27, and F28 are all 8mm.

[0044] The drive rod 11 presses downward, causing the connecting shaft 17 to rotate, which in turn drives the drive gear 12 to rotate. The drive rod 11 rotates 90 degrees counterclockwise downward, which in turn drives the second gear set to rotate. The second transition gear 29 rotates 585 degrees clockwise, and gear F28 rotates 585 degrees clockwise, which in turn drives the second rack 16 to move downward by about 40 mm, causing the piston 3 to move downward by 40 mm. The downward stroke of the piston 3 is greater than the downward stroke of the oil reservoir 2, so the volume of the pressure transformer chamber 4 decreases and the air pressure increases. When the piston 3 moves to its position, a positive pressure is formed in the pressure transformer chamber 4. Under the action of the positive pressure, the printing ink in the oil reservoir 7 leaks downward to the surface of the stamp negative mold 6.

[0045] The speed ratio between the oil reservoir 2 and the piston 3 is 1:1.4. The opening pressure of the one-way pressure relief valve on the piston 3 is 0.14 MPa. When the oil reservoir 2 and the piston 3 are working, the height h of the pressure regulating chamber 4 decreases from 20 mm to 10 mm, causing the air pressure inside the pressure regulating chamber 4 to rise. When the air pressure inside the pressure regulating chamber 4 is higher than the opening pressure of the one-way pressure relief valve, the excess gas inside the pressure regulating chamber 4 will be discharged, maintaining the maximum air pressure inside the pressure regulating chamber 4 at 0.14 MPa. This pressure is also the maximum air pressure of the pressure regulating chamber 4 and the working air pressure. When the piston 3 returns to the initial position, the pressure in the pressure regulating chamber 4 decreases from 0.14 MPa to 0.07 MPa, forming a negative pressure. Under the action of negative pressure, the printing oil stops leaking downwards.

[0046] At a height of 23mm in the transformer chamber 4, there is a 2mm diameter oil filling hole 5, which can be used to add printing ink. A positioning plate 19 is provided at the initial position of the drive rod 11. When the drive rod 11 is engaged with the positioning plate 19, the height of the transformer chamber 4 is the initial height h1, which is 20mm. Opening the positioning plate 19 allows the drive rod 11 to continue rotating clockwise by 30 degrees. The drive rod 11 drives the oil reservoir 2 to move upward by 10mm, and the piston 3 to move upward by 14mm. At this point, the height h of the transformer chamber 4 is 24mm, allowing printing ink to be added at the oil filling hole 5, thus enabling continuous use of this type of stamp structure.

[0047] Before using the stamping device, ink is injected into the pressure chamber 4 to saturate the ink reservoir 7. The ink reservoir 7 is then placed on the upper surface of the stamp negative mold 6 to spread the ink. When the stamping device is in operation, the drive mechanism drives the ink reservoir 2 and piston 3 to move downwards. The ink reservoir 2 and piston 3 move relative to each other, but the moving distance of the ink reservoir 2 is less than the moving distance of the piston 3, which reduces the volume of the pressure chamber 4 and increases the air pressure inside the pressure chamber 4. The ink on the ink reservoir 7 is subjected to positive pressure and seeps downwards, penetrating through the capillary pores 8 into the surface of the concave 9 of the stamp negative mold 6. The stamp negative mold 6, along with the ink reservoir 2, is pressed downwards onto the stamp positive mold 39, thus printing a colored 3D graphic seal. After printing is completed, the drive mechanism returns to its original position, driving the oil reservoir 2 and piston 3 to move upward. The oil reservoir 2 and piston 3 move relative to each other, but the moving distance of the oil reservoir 2 is less than the moving distance of the piston 3, which increases the volume of the pressure changing chamber 4 and decreases the air pressure inside the pressure changing chamber 4, keeping the pressure changing chamber 4 at a low pressure to prevent the printing ink from seeping down.

[0048] Example 2: A steel stamping device capable of affixing color graphics (see attached document) Figure 1 To be continued Figure 3 The system includes a frame 1 and an oil reservoir 2. A piston 3 is installed inside the oil reservoir 2. Both the piston 3 and the oil reservoir 2 are cylindrical. A sealing ring is installed on the outer wall of the piston 3. A pressure-changing chamber 4 is formed below the piston 3 inside the oil reservoir 2. An oil injection hole 5 is provided on the side wall of the oil reservoir 2, located above the pressure-changing chamber 4. A drive mechanism is installed on the frame 1, which drives the oil reservoir 2 and the piston 3 to move up and down. A stamp die 6 and an oil storage pad 7 are installed at the lower end of the oil reservoir 2. The oil storage pad 7 is placed on the upper surface of the stamp die 6, which has capillary pores 8. A groove 9 is provided on the lower surface of the stamp die 6, and the capillary pores 8 are located on the bottom surface of the groove 9. The lifting speed of the oil reservoir 2 is greater than that of the piston 3. When the oil reservoir 2 and the piston 3 move downwards and move closer to each other, the pressure in the pressure-changing chamber 4 increases. When the oil reservoir 2 and the piston 3 move upwards and move away from each other, the pressure in the pressure-changing chamber 4 decreases. The piston 3 is provided with a pressure relief hole 10, which is connected to a one-way pressure relief valve.

[0049] like Figure 4As shown, the one-way pressure relief valve includes a valve body 46, a valve cavity 47 within the valve body 46, a valve disc 48 installed within the valve cavity 47, and a sealing surface 49 within the valve cavity 47. The valve disc 48 is sealed and pressed against the sealing surface 49. An adjusting column 50 is threaded onto the valve body 46, and an exhaust port 51 is provided on the adjusting column 50. A preload spring 52 is installed between the adjusting column 50 and the valve disc 48. A pressure relief groove 53 is provided on the side wall of the valve disc 48. When the pressure inside the valve cavity 47 increases, it pushes the valve disc 48 to move, allowing airflow to be discharged outward through the pressure relief groove 53. A positioning hole 54 is provided on the adjusting column 50, and a positioning rod 55 is connected to the valve disc 48. The preload spring 52 is fitted onto the positioning rod 55, and the positioning rod 55 is movably inserted into the positioning hole 54. A sealing gasket 56 is provided on the end face of the valve disc 48, and the sealing gasket 56 is sealed and fitted against the sealing surface 49. The sealing surface 49 on the inner wall of the valve cavity 47 has a stepped structure. The end of the adjusting column 50 is connected to the handle 57, which facilitates the rotation of the adjusting column 50.

[0050] The drive mechanism includes a drive rod 11, on which a drive gear 12 is mounted. The drive gear 12 is rotatably mounted on the frame 1. A push-pull rod 13 is connected to the piston 3. A cover 14 is provided at the upper end of the oil reservoir 2. The push-pull rod 13 movably passes through the cover 14. The cross-section of the push-pull rod 13 is "D" shaped. A through hole adapted to the push-pull rod 13 is provided on the cover 14, through which the push-pull rod 13 passes. A first rack 15 is provided on the oil reservoir 2, and a second rack 16 is provided on the push-pull rod 13. A first gear set is connected between the drive gear 12 and the first rack 15, and a second gear set is connected between the drive gear 12 and the second rack 16. A return torsion spring is installed between the drive gear 12 and the frame 1. The return torsion spring facilitates the return of the drive mechanism after the stamp is printed. Two drive gears 12 are provided. One drive gear 12 is connected to the first rack 15 through the first gear set. The other drive gear 12 is connected to the second rack 16 through the second gear set. The two drive gears 12 are connected by a connecting shaft 17, which is rotatably connected to the frame 1. The drive rod 11 is fastened to the connecting shaft 17. A clearance groove 18 is provided on the frame 1 corresponding to the drive rod 11. The drive rod 11 passes through the clearance groove 18, and a positioning plate 19 is detachably connected to the upper end of the clearance groove 18. Rotating the drive rod 11 upwards to the end of the positioning plate 19 indicates that it has reached the correct position. After removing the positioning plate 19, the drive rod 11 is rotated upwards until it abuts against the upper end of the clearance groove 18. At this point, the oil injection hole 5 connects to the transformer chamber 4, and printing oil is added to the transformer chamber 4 through the oil injection hole 5. The oil reservoir 2 has two guide grooves 20, and the frame 1 has two guide rails 21. The two guide grooves 20 are slidably connected to the two guide rails 21 respectively.

[0051] Initial pressure in transformer chamber 4 P2 is the air pressure inside the pressure-transforming chamber 4 during operation; h1 is the initial height of the pressure-transforming chamber 4; x1 is the total transmission ratio of the first gear set; x2 is the total transmission ratio of the second gear set; the first gear set includes several first transmission gears, and the diameter of the first transmission gear meshing with the first rack 15 is d1; the second gear set includes several second transmission gears, and the diameter of the second transmission gear meshing with the second rack 16 is d2. Based on the above formulas, the speed ratio of the piston 3 and the oil reservoir 2 is controlled, thereby controlling the initial air pressure inside the pressure-transforming chamber 4, reducing the air pressure inside the pressure-transforming chamber 4 to 0.05MPa-0.07MPa. The negative pressure inside the pressure-transforming chamber 4 can draw back excess ink from the stamp negative mold 6, preventing further ink seepage. During operation, the air pressure inside the pressure-transforming chamber 4 is controlled between 0.14MPa and 0.3MPa, which is the maximum air pressure inside the pressure-transforming chamber 4, and is adjusted and controlled by a one-way pressure relief valve.

[0052] Both the first and second transmission gears are rotatably mounted on the frame 1. There are three first transmission gears: gear A22, gear B23, and gear C24. Gear A22 meshes between the driving gear 12 and gear B23. Gear C24 is coaxially connected to a first transition gear 25. Gear B23 meshes between gear A22 and the first transition gear 25. Gear C24 meshes with a first rack 15.

[0053] The second transmission gear consists of three gears: D26, E27, and F28. Gear D26 meshes between the driving gear 12 and gear E27. Gear F28 is coaxially connected to the second transition gear 29. Gear E27 meshes between gear D26 and the second transition gear 29. Gear F28 meshes with the second rack 16.

[0054] A detachable stamp ring 30 is installed at the lower end of the oil reservoir 2, and a sealing ring is installed between the outer wall of the stamp ring 30 and the inner wall of the oil reservoir 2. The stamp die 6 and the oil reservoir pad 7 are both securely connected to the stamp ring 30. A support flange 31 is located near the lower end of the inner wall of the stamp ring 30, and a support boss 32 is located on the outer edge of the stamp die 6. The stamp die 6 is supported on the support flange 31 of the stamp ring 30 by the support boss 32. Sealant is applied to the support boss 32 before it is connected to the support flange 31 to ensure a tight seal. A connecting ring 33 is located on the edge of the oil reservoir pad 7, and the connecting ring 33 is threadedly connected to the inner wall of the stamp ring 30. The support boss 32 is tightly clamped between the connecting ring 33 and the support flange 31. A positioning protrusion 34 is provided on the stamp ring 30, and a positioning groove 35 is provided at the lower end of the oil reservoir 2, in which the positioning protrusion 34 is installed. A T-shaped slot is provided at the opening of the positioning groove 35. The slot is adapted to connect a T-shaped card plate 36. The card plate 36 abuts against the positioning protrusion 34 to achieve fastening of the positioning protrusion 34. A sealing ring is installed between the outer wall of the stamp ring 30 and the inner wall of the oil reservoir 2.

[0055] A base 37 is mounted on the frame 1, and a mold sleeve 38 is detachably connected to the base 37. The mold sleeve 38 is adapted to connect to a positive stamp mold 39, which corresponds to a negative stamp mold 6. The positive stamp mold 39 has a raised mark 40, which corresponds to a recess 9 on the negative stamp mold 6. A positioning groove 41 is provided on the base 37, and the mold sleeve 38 is adapted to connect with the positioning groove 41. A locking protrusion 42 is provided on the side wall of the positioning groove 41, and a locking groove 43 is provided on the outer wall of the mold sleeve 38. The locking protrusion 42 and the locking groove 43 are adapted to connect and achieve positioning of the mold sleeve 38. A limiting protrusion 44 is provided on the inner wall of the mold sleeve 38, and a limiting groove 45 is provided on the outer wall of the positive stamp mold 39. The limiting protrusion 44 and the limiting groove 45 are adapted to connect and achieve positioning of the positive stamp mold 39.

[0056] In this embodiment, a base 37 with a length of 120mm, a width of 60mm, and a thickness of 10mm is selected. A circular positioning groove 41 with a diameter of 55mm and a depth of 5mm is opened on the right side of the center of the base 37. A mold sleeve 38 with an inner diameter of 45mm is installed inside the positioning groove 41 to hold the stamp positive mold 39. The middle part of the frame 1 is generally hollowed out for assembling the drive mechanism. A top cover 14 is provided at the upper end of the oil reservoir 2 to limit the piston 3. The push-pull rod 13 passes through a through hole in the top cover 14.

[0057] The oil reservoir 2 has an outer diameter of 55mm, an inner diameter of 50mm, and a height of 60mm. Three grooves are cut on one side of the oil reservoir 2; two narrow grooves, each 2mm wide, serve as guide grooves 20. Two guide rails 21 on the frame 1 are slidably connected to the two guide grooves 20 on the oil reservoir 2. A first rack 15, 50mm long, is mounted on one of the wider grooves. The oil reservoir 2 contains a piston 3, an oil reservoir pad 7 ring, a stamp ring 30, and a stamp die 6. The oil reservoir 2 is then mounted on the frame 1, and it moves up and down on the frame 1.

[0058] The frame 1 houses a first gear set and a second gear set. The total transmission ratio x1 of the first gear set is 1:4. The driving gear 12, meshing with the first gear set, has a diameter of 20mm. Gears A22, B23, and C24 all have diameters of 10mm, and the first intermediate gear 25 has a diameter of 5mm. The drive rod 11 and the two driving gears 12 are fixed to the connecting shaft 17, which is rotatably mounted on the frame 1. The drive rod 11 presses downwards, causing the connecting shaft 17 to rotate, which in turn drives the driving gears 12. The drive rod 11 rotates 90 degrees counterclockwise downwards, causing the first gear set to rotate. The first intermediate gear 25 rotates 360 degrees clockwise, and gear C24 rotates 360 degrees clockwise, causing the oil reservoir 2 to move downwards for approximately 30mm. When the oil reservoir 2 reaches the bottom, the negative mold 6 and the positive mold 39 of the stamp engage, stamping the seal.

[0059] The total transmission ratio x2 of the second gear set is 1:6.5. The diameter of the driving gear 12 that meshes with the second gear set is 20mm, the diameter of the second transition gear 29 is 3mm, and the diameters of gears D26, E27, and F28 are all 8mm.

[0060] The drive rod 11 presses downward, causing the connecting shaft 17 to rotate, which in turn drives the drive gear 12 to rotate. The drive rod 11 rotates 90 degrees counterclockwise downward, which in turn drives the second gear set to rotate. The second transition gear 29 rotates 585 degrees clockwise, and gear F28 rotates 585 degrees clockwise, which in turn drives the second rack 16 to move downward by about 40 mm, causing the piston 3 to move downward by 40 mm. The downward stroke of the piston 3 is greater than the downward stroke of the oil reservoir 2, so the volume of the pressure transformer chamber 4 decreases and the air pressure increases. When the piston 3 moves to its position, a positive pressure is formed in the pressure transformer chamber 4. Under the action of the positive pressure, the printing ink in the oil reservoir 7 leaks downward to the surface of the stamp negative mold 6.

[0061] The speed ratio between the oil reservoir 2 and the piston 3 is 1:1.4. The opening pressure of the one-way pressure relief valve on the piston 3 is 0.14 MPa. When the oil reservoir 2 and the piston 3 are working, the height h of the pressure regulating chamber 4 decreases from 20 mm to 10 mm, causing the air pressure inside the pressure regulating chamber 4 to rise. When the air pressure inside the pressure regulating chamber 4 is higher than the opening pressure of the one-way pressure relief valve, the excess gas inside the pressure regulating chamber 4 will be discharged, maintaining the maximum air pressure inside the pressure regulating chamber 4 at 0.14 MPa. This pressure is also the maximum air pressure of the pressure regulating chamber 4 and the working air pressure. When the piston 3 returns to the initial position, the pressure in the pressure regulating chamber 4 decreases from 0.14 MPa to 0.07 MPa, forming a negative pressure. Under the action of negative pressure, the printing oil stops leaking downwards.

[0062] At a height of 23mm in the transformer chamber 4, there is a 2mm diameter oil filling hole 5, which can be used to add printing ink. A positioning plate 19 is provided at the initial position of the drive rod 11. When the drive rod 11 is engaged with the positioning plate 19, the height of the transformer chamber 4 is the initial height h1, which is 20mm. Opening the positioning plate 19 allows the drive rod 11 to continue rotating clockwise by 30 degrees. The drive rod 11 drives the oil reservoir 2 to move upward by 10mm, and the piston 3 to move upward by 14mm. At this point, the height h of the transformer chamber 4 is 24mm, allowing printing ink to be added at the oil filling hole 5, thus enabling continuous use of this type of stamp structure.

[0063] Before using the stamping device, ink is injected into the pressure chamber 4 to saturate the ink reservoir 7. The ink reservoir 7 is then placed on the upper surface of the stamp negative mold 6 to spread the ink. When the stamping device is in operation, the drive mechanism drives the ink reservoir 2 and piston 3 to move downwards. The ink reservoir 2 and piston 3 move relative to each other, but the moving distance of the ink reservoir 2 is less than the moving distance of the piston 3, which reduces the volume of the pressure chamber 4 and increases the air pressure inside the pressure chamber 4. The ink on the ink reservoir 7 is subjected to positive pressure and seeps downwards, penetrating through the capillary pores 8 into the surface of the concave 9 of the stamp negative mold 6. The stamp negative mold 6, along with the ink reservoir 2, is pressed downwards onto the stamp positive mold 39, thus printing a colored 3D graphic seal. After printing is completed, the drive mechanism returns to its original position, driving the oil reservoir 2 and piston 3 to move upward. The oil reservoir 2 and piston 3 move relative to each other, but the moving distance of the oil reservoir 2 is less than the moving distance of the piston 3, which increases the volume of the pressure changing chamber 4 and decreases the air pressure inside the pressure changing chamber 4, keeping the pressure changing chamber 4 at a low pressure to prevent the printing ink from seeping down.

[0064] Comparative Example 1

[0065] The overall dimensions of the stamping device are consistent with those of Embodiments 1 and 2, but a one-way pressure relief valve is not installed on piston 3. After piston 3 is pressed down, the air pressure in the pressure-changing chamber 4 is high, resulting in an excessive amount of ink being expelled, causing the writing to become blurry. After piston 3 returns to its original position, the air pressure in the pressure-changing chamber 4 remains positive, making it impossible to draw back the residual ink on the stamp, and the ink continues to leak downwards.

[0066] Comparative Example 2

[0067] The overall dimensions of the stamping device are consistent with those of Embodiments 1 and 2. A one-way pressure relief valve is installed on piston 3, with an opening air pressure of 0.25 MPa. After piston 3 is pressed down, the air pressure in the pressure-transforming chamber 4 is slightly higher, and the writing is normal. After piston 3 returns to its original position, the air pressure in the pressure-transforming chamber 4 remains positive, making it impossible to draw back the residual ink on the stamp, and the ink continues to leak downwards.

[0068] Comparative Example 3

[0069] The overall dimensions of the stamping device are consistent with those of Embodiments 1 and 2, and the transmission ratio of the second gear set is 1:5.5. After the oil reservoir 2 reaches the bottom and the male and female stamp molds are engaged, the piston 3 presses down. The maximum air pressure in the pressure-transforming chamber 4 is 0.14 MPa. When the piston 3 returns to its original position relative to the oil reservoir 2, the air pressure in the pressure-transforming chamber 4 is 0.116 MPa. This is still a positive pressure, making it impossible to draw back the residual ink on the stamp, and the ink continues to leak downwards.

[0070] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A stamping device capable of affixing color graphics, characterized in that, The device includes a frame and an oil reservoir. A piston is installed inside the oil reservoir, and a pressure-transforming chamber is formed below the piston. A drive mechanism is installed on the frame, which drives the oil reservoir and piston to move up and down. A stamp die and an oil storage pad are installed at the lower end of the oil reservoir, with the oil storage pad placed on the upper surface of the stamp die. The stamp die has capillary pores. When the oil reservoir and piston move downward, the pressure in the pressure-transforming chamber increases; when the oil reservoir and piston move upward, the pressure in the pressure-transforming chamber decreases. The drive mechanism includes a drive rod with a drive gear installed on it. A push-pull rod is connected to the piston. A first rack is provided on the oil reservoir, and a second rack is provided on the push-pull rod. A first gear set is connected between the drive gear and the first rack, and a second gear set is connected between the drive gear and the second rack.

2. The stamping device capable of affixing color graphics and text according to claim 1, characterized in that, The piston is provided with a pressure relief hole, which is connected to a one-way pressure relief valve.

3. The stamping device capable of affixing color graphics and text according to claim 1, characterized in that, A detachable stamp ring is installed at the lower end of the oil reservoir. The stamp negative mold and the oil reservoir pad are both securely connected to the stamp ring.

4. The stamping device capable of affixing color graphics and text according to claim 3, characterized in that, A positioning protrusion is provided on the stamp ring, and a positioning groove is provided at the lower end of the oil reservoir, with the positioning protrusion installed in the positioning groove.

5. A stamping device capable of affixing color graphics and text according to claim 1, characterized in that, A base is installed on the frame, and a mold sleeve can be detachably connected to the base. The mold sleeve is adapted to connect to the positive mold of the stamp, and the positive mold and negative mold of the stamp are set accordingly.

6. The stamping device capable of affixing color graphics and text according to claim 1, characterized in that, The oil storage tank is equipped with a guide groove, and the frame is equipped with a guide rail. The guide groove and the guide rail are slidably connected.

7. A stamping device capable of affixing color graphics according to claim 1, characterized in that, Initial pressure inside the transformer chamber P2 is the air pressure inside the transformer chamber during operation; h1 is the initial height of the transformer chamber; X1 is the total transmission ratio of the first gear set; X2 is the total transmission ratio of the second gear set; the first gear set includes several first transmission gears, and the diameter of the first transmission gear meshing with the first rack is d1; the second gear set includes several second transmission gears, and the diameter of the second transmission gear meshing with the second rack is d2.

8. A stamping device capable of affixing color graphics and text according to claim 1, characterized in that, A reset torsion spring is installed between the drive gear and the frame.

9. A stamping device capable of affixing color graphics according to any one of claims 1 to 6, characterized in that, An oil injection hole is provided on the side wall of the oil storage tank.

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