A concave printing die capable of punching a special-shaped tooth hole on a stamp

Abstract

The utility model discloses a concave printing mould that can punch and hit special-shaped tooth hole on the stamp relates to stamp punching equipment technical field, including base, lower mould and upper mould, the lower surface of base is installed with lower mould, the below of top plate is provided with upper mould, the upper surface of upper mould is installed with air pump, the below of gas collecting hood is installed with apron, the below of connecting plate is installed with punch, the front and back both sides of lower mould all are installed with slide rail, the below of movable frame strip is installed with extrusion plate through telescopic spring, the upper surface of lower mould front and back both sides all are set up with limit groove. This concave printing mould that can punch and hit special-shaped tooth hole on the stamp, the compressed air that air hole sprays forms gas film after stamping, reduces the adhesion of stamp and punch, and cooperation lower mould's upper surface smears low friction coefficient release agent, improves the success rate of release, avoids the stamp tearing of traditional forced release, reduces the rate of defective products, realizes mould according to stamp drawing and can design the shape matched with the stamp theme.

Description

Technical Field

[0001] This utility model relates to the technical field of stamp perforation equipment, specifically to an intaglio mold capable of punching irregular perforations on stamps. Background Technology

[0002] Stamps possess both practical communication value and cultural and artistic collectible value. Perforations are one of the important features of stamps, facilitating tearing and separating them, and serving as a crucial element for stamp collectors' research and appreciation. Stamp perforations are mostly regular circles or rhombuses, produced by a perforation mold through a stamping process.

[0003] For example, Chinese utility model patent application number 201721316236.1 discloses a novel mold for punching anti-counterfeiting perforations in the shape of a vase on stamps. The mold consists of an upper cover plate, a fixing pin plate, a guide plate, and a lower base plate arranged from top to bottom. The structure is simple, compact, and easy to install. The upper cover plate and the fixing pin plate are fixedly connected to form a single unit, as are the guide plate and the lower base plate. These two units are connected by a combination of guide posts and guide sleeves, improving the accuracy of stamp punching. However, the device still has certain shortcomings. During the stamp perforation process, after the stamp is formed, the paper is easily stuck in the grooves, protrusions and other fine structures of the mold. Forcibly demolding it can cause the stamp edges to tear, wrinkle, or even damage the integrity of the perforations, resulting in a large number of defective products, increasing production costs, and increasing the frequency of mold cleaning.

[0004] Therefore, we propose an intaglio printing mold capable of punching irregular perforations on stamps to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide an intaglio printing mold capable of punching irregularly shaped perforations on stamps, in order to solve the problems mentioned in the background art. In the current market, during the stamping process, after the stamp is formed, the paper is easily stuck in the grooves, protrusions, and other fine structures of the mold. Forcibly demolding it will cause the stamp edges to tear, wrinkle, or even damage the integrity of the perforations, resulting in a large number of defective products, increasing production costs, and increasing the frequency of mold cleaning. It can also realize that the mold can be designed with a shape that matches the stamp theme according to the stamp artwork.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a gravure printing mold capable of punching irregular perforations on stamps, comprising a base, a lower mold, and an upper mold. The lower mold is mounted on the lower surface of the base, and a top plate is mounted on the upper surface of the base via a support plate. The upper mold is located below the top plate. An air pump is mounted on the upper surface of the upper mold, and a gas collection hood is mounted on the lower right side of the air pump via a fixed connecting pipe. A cover plate is mounted below the gas collection hood, and a connecting plate is mounted below the cover plate. A punch is mounted below the connecting plate, and the punch has air holes. The lower mold is equipped with slide rails on both the front and rear sides, and movable frame bars are installed on both the left and right sides of the slide rails. A pressing plate is installed below the movable frame bar via a telescopic spring, and a pull rod is installed above the pressing plate. Limit grooves are opened on both the front and rear sides of the upper surface of the lower mold, and limit bolts are installed on both the front and rear sides of the upper surface of the movable frame bar.

[0007] Preferably, the top plate is connected to the upper mold via a hydraulic rod, the cover plate is located below the upper mold, and the upper surface of the lower mold is coated with a release agent with a low coefficient of friction.

[0008] With the above structural design, the hydraulic rod drives the upper die to move vertically. With the precise guidance of the guide rod and guide sleeve, the positioning accuracy of the punch is ensured. It can punch complex irregular tooth holes such as bottle shape and fan shape to meet the requirements of high-precision processing.

[0009] Preferably, the connecting plate is detachably connected to the cover plate by fixing bolts, the lower surface of the connecting plate is provided with a groove, the upper end of the punch is located in the groove, the air hole passes through the punch, and the air collection hood is connected to the groove.

[0010] The above structural design, with its detachable connecting plate and cover plate, facilitates the replacement of punches. By adapting different punches to diverse tooth hole requirements, the versatility of the mold is improved, and production costs are reduced.

[0011] Preferably, guide rods are installed on the lower left and right sides of the upper mold, and guide sleeves are installed on the upper left and right sides of the lower mold, with the guide rods and guide sleeves slidably connected.

[0012] The above structural design, with the sliding fit between the guide rod and the guide sleeve, effectively suppresses punch deviation, making it especially suitable for stamping thin stamps, avoiding irregular perforations caused by tilting, and improving the consistency of finished products.

[0013] Preferably, each slide rail is equipped with a limit rod inside, and the movable frame is slidably connected to the limit rod and the slide rail.

[0014] With the above structural design, the movable frame can be adjusted by sliding along the slide rail and the limiting rod. Combined with the locking structure of the limiting bolt and the limiting groove, the stamp can be quickly fixed.

[0015] Preferably, the pull rod passes through the movable frame bar, the pull rod is slidably connected to the movable frame bar, and multiple telescopic springs are provided.

[0016] The above structural design, with its elastic fixing system of telescopic spring and extrusion plate, provides uniform pressure and is suitable for stamps made of various materials such as ordinary paper and art paper. The lower surface of the extrusion plate can be provided with a silicone layer to avoid indentation damage and ensure the integrity of the stamp surface.

[0017] Preferably, multiple limiting grooves are provided, and the diameter of the limiting grooves is smaller than the diameter of the limiting bolts.

[0018] With the above structural design, rotating the limiting bolt causes it to move downwards, engaging with the limiting groove on the lower mold. This limits the movement of the frame, securing the stamp and ensuring its stability during stamping, preventing it from shifting.

[0019] Compared with the prior art, the beneficial effects of this utility model are: the intaglio die capable of punching irregular perforations on stamps: 1. Anti-paper jam demolding design: The compressed air ejected from the air hole forms an air film after stamping, which reduces the adhesion between the stamp and the punch. Combined with the low friction coefficient demolding agent applied to the upper surface of the lower mold, it improves the success rate of demolding, avoids the stamp tearing caused by traditional forced demolding, and reduces the defect rate. 2. High-precision guiding system: The sliding fit between the guide rod and the guide sleeve ensures that the punch moves vertically during the punching process, avoiding deviation in the position of the tooth hole due to offset; 3. Low maintenance cost: The connecting plate and the cover plate are detachably connected by fixing bolts, and the punch can be disassembled and cleaned separately, which facilitates the replacement and maintenance of the punch; 4. Stamp fixing mechanism: Place the stamp on the upper surface of the lower die where the hole needs to be punched, and then pull the movable frame bars on the left and right sides in sequence. Pull the lever upward, and the lever will drive the extrusion plate to move upward. At this time, the telescopic spring is in a compressed state. When the movable frame bar moves to the side of the stamp, align the limit bolt with the limit groove on the lower die, release the lever, and the extrusion plate will move downward under the action of the telescopic spring's rebound force to extrude and fix the edge of the stamp. The stamp is fixed on both sides by the extrusion plates on the left and right sides. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall main structure of this utility model; Figure 2 This is a schematic diagram of the structure below the upper mold of this utility model; Figure 3 This is a schematic diagram of the internal structure of the connecting plate of this utility model; Figure 4 This is a schematic diagram of the connection structure between the guide rod and the guide sleeve of this utility model; Figure 5 This is a schematic diagram of the position structure of the movable frame and slide rail of this utility model; Figure 6 This utility model Figure 5 Enlarged structural diagram at point A in the middle.

[0021] In the diagram: 1. Base; 2. Lower mold; 3. Support plate; 4. Top plate; 5. Hydraulic rod; 6. Upper mold; 7. Air pump; 8. Fixed connecting pipe; 9. Air hood; 10. Cover plate; 11. Connecting plate; 12. Groove; 13. Punch; 14. Air hole; 15. Guide rod; 16. Guide sleeve; 17. Slide rail; 18. Limiting rod; 19. Movable frame strip; 20. Telescopic spring; 21. Extrusion plate; 22. Tie rod; 23. Limiting groove; 24. Limiting bolt. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1 Please see Figures 1-6This utility model provides a technical solution: an intaglio printing mold capable of punching irregular perforations on stamps, comprising a base 1, a lower mold 2, a support plate 3, a top plate 4, a hydraulic rod 5, an upper mold 6, an air pump 7, a fixed connecting pipe 8, an air collection hood 9, a cover plate 10, a connecting plate 11, a groove 12, a punch 13, an air hole 14, a guide rod 15, a guide sleeve 16, a slide rail 17, a limiting rod 18, a movable frame strip 19, a telescopic spring 20, a pressing plate 21, a pull rod 22, a limiting groove 23, and a limiting bolt 24. The lower mold 2 is mounted on the lower surface of the base 1, and the upper surface of the base 1... A top plate 4 is mounted on a support plate 3. An upper mold 6 is positioned below the top plate 4. An air pump 7 is mounted on the upper surface of the upper mold 6, and a gas collection hood 9 is mounted on the lower right side of the air pump 7 via a fixed connecting pipe 8. A cover plate 10 is mounted below the gas collection hood 9, and a connecting plate 11 is mounted below the cover plate 10. The top plate 4 is connected to the upper mold 6 via a hydraulic rod 5. The cover plate 10 is located below the upper mold 6. A low-friction release agent is applied to the upper surface of the lower mold 2. The hydraulic rod 5 drives the upper mold 6 downwards, causing the upper mold 6 to move the cover plate 10 and the connecting plate 11 downwards. The punch 13... As the connecting plate 11 moves downwards to contact the stamp, it punches and forms a hole in the stamp. A punch 13 is installed below the connecting plate 11, and the punch 13 has an air hole 14. The connecting plate 11 is detachably connected to the cover plate 10 by fixing bolts. A groove 12 is formed on the lower surface of the connecting plate 11, and the upper end of the punch 13 is located in the groove 12. The air hole 14 passes through the punch 13. The air collection hood 9 is connected to the groove 12, which facilitates the disassembly of the connecting plate 11 and the punch 13 below it, and facilitates the replacement of the punch 13 according to the requirements of different irregular perforation holes. After punching is completed, the air pump 7 is started. Air pump 7 injects compressed air into air collection hood 9 through fixed connecting pipe 8. The airflow is ejected from air hole 14 of punch 13 through groove 12. At the moment of punching, it loosens the contact part between the stamp and punch 13, making it easy to demold. At the same time, punch 13 can be moved upward. Guide rods 15 are installed on the left and right sides of the lower mold 6. Guide sleeves 16 are installed on the left and right sides of the upper surface of the lower mold 2. Guide rods 15 and guide sleeves 16 are slidably connected. The guide rods 15 and guide sleeves 16 cooperate to ensure that punch 13 moves vertically during punching and avoids deviation of tooth hole position due to offset.

[0024] The lower mold 2 has slide rails 17 installed on both the front and rear sides, and movable frame bars 19 installed on both the left and right sides of the slide rails 17. Limit rods 18 are installed inside each slide rail 17. The movable frame bars 19 are slidably connected to the limit rods 18 and the slide rails 17. When the movable frame bars 19 are under force, they can move left and right along the limit rods 18 and the slide rails 17, thus making the movable frame bars 19 more stable during left and right movement. A pressing plate 21 is installed below the movable frame bars 19 via a telescopic spring 20, and a pull rod 22 is installed above each pressing plate 21. Limit grooves 23 are formed on both the front and rear sides of the upper surface of the lower mold 2. Limit bolts 24 are installed on both the front and rear sides of the upper surface of the movable frame bars 19. The pull rods 22 pass through the movable frame bars 19 and are slidably connected to them. Multiple telescopic springs 20 are provided. To place the stamp on the upper surface of the lower mold 2, it is necessary to... The position of the hole is determined, and then the movable frame bars 19 on both sides are pulled in sequence. The pull rod 22 is pulled upward, and the pull rod 22 drives the extrusion plate 21 to move upward. At this time, the telescopic spring 20 is in a compressed state. When the movable frame bar 19 moves to the side of the stamp, the limiting bolt 24 is aligned with the limiting groove 23 on the lower mold 2. The pull rod 22 is released, and the extrusion plate 21 moves downward under the action of the elastic force of the telescopic spring 20, extruding and fixing the edge of the stamp. The extrusion plates 21 on both sides fix the two sides of the stamp. There are multiple limiting grooves 23, and the diameter of the limiting groove 23 is smaller than the diameter of the limiting bolt 24. Finally, the limiting bolt 24 is rotated so that the limiting bolt 24 engages with the limiting groove 23 on the lower mold 2, thereby completing the limiting of the movable frame bar 19 and fixing the stamp, making the stamp stable during the punching process and less prone to displacement.

[0025] Example 2 This utility model provides a technical solution: an intaglio printing mold capable of punching irregularly shaped perforations on stamps. The difference between this embodiment and Embodiment 1 is as follows: Different thicknesses and materials of stamp paper require different punching force and depth. Pressure and displacement sensors are integrated into the mold. A pressure sensor is installed on the lower mold 2 to monitor the pressure during the punching process in real time. The displacement sensor is located on the side of the punch 13 and measures its stroke. Through the control system, the punching force and depth can be preset according to the stamp paper parameters. When the actual value fed back by the sensor does not match the preset value, the system automatically adjusts the pressure output and stroke of the hydraulic rod 5 to ensure that the perforations can penetrate the stamp paper without causing excessive damage, thus guaranteeing the integrity of the stamp. The pressure and displacement sensors are well-known technical concepts in this field, therefore their internal structure and working principle will not be described in detail.

[0026] Working principle: When using this gravure printing mold that can punch irregular perforations on stamps, first, place the stamp on the upper surface of the lower mold 2 at the position where the perforation is to be made. Then, pull the movable frame bars 19 on both sides in sequence, pull the pull rod 22 upward, and the pull rod 22 drives the extrusion plate 21 to move upward. At this time, the telescopic spring 20 is in a compressed state. When the movable frame bar 19 moves to the side of the stamp, the limiting bolt 24 is aligned with the limiting groove 23 on the lower mold 2. Release the pull rod 22, and the extrusion plate 21 moves downward under the action of the elastic force of the telescopic spring 20, squeezing and fixing the edge of the stamp. The extrusion plates 21 on both sides fix the two sides of the stamp. Then, rotate the limiting bolt 24 so that the limiting bolt 24 engages with the limiting groove 23 on the lower mold 2, thereby completing the limiting of the movable frame bar 19 and fixing the stamp, making the stamp stable during the punching process and less prone to displacement.

[0027] Hydraulic rod 5 drives upper mold 6 downwards. Upper mold 6 moves cover plate 10 and connecting plate 11 downwards. Punch 13 moves downwards with connecting plate 11 to contact the stamp and punch it. After punching, air pump 7 is started. Air pump 7 injects compressed air into air collection hood 9 through fixed connecting pipe 8. The airflow is ejected from air hole 14 of punch 13 through groove 12, loosening the contact area between the stamp and punch 13 at the moment of punching, facilitating demolding. At the same time, punch 13 is moved upwards, thus completing a series of operations. Content not described in detail in this specification belongs to prior art known to those skilled in the art.

[0028] This device can punch perforations of any shape and location on stamps. These irregularly shaped perforations not only enhance the artistic appeal and anti-counterfeiting features of the stamps but also make counterfeiting more difficult, effectively preventing the emergence of counterfeit stamps. Specific applications include: oval perforated stamps, star-shaped perforated stamps, cross-shaped perforated stamps, large circular perforated stamps, inverted 8-shaped perforated stamps, dumbbell-shaped perforations, hexagonal star-shaped perforations, dinosaur-shaped perforations, leaf-shaped perforations, and heart-shaped perforations.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gravure printing mold capable of punching irregular perforations on stamps, comprising a base (1), a lower mold (2), and an upper mold (6), wherein the lower mold (2) is mounted on the lower surface of the base (1), and a top plate (4) is mounted on the upper surface of the base (1) via a support plate (3), and the upper mold (6) is disposed below the top plate (4), characterized in that: An air pump (7) is installed on the upper surface of the upper mold (6), and a gas collection hood (9) is installed on the lower right side of the air pump (7) through a fixed connecting pipe (8). A cover plate (10) is installed below the gas collection hood (9), and a connecting plate (11) is installed below the cover plate (10). A punch (13) is installed below the connecting plate (11), and an air hole (14) is opened on the punch (13). The lower mold (2) is equipped with slide rails (17) on both the front and rear sides, and movable frame bars (19) are installed on both the left and right sides of the slide rails (17). A pressing plate (21) is installed below the movable frame bar (19) via a telescopic spring (20), and a pull rod (22) is installed above the pressing plate (21). Limiting grooves (23) are opened on both the front and rear sides of the upper surface of the lower mold (2), and limiting bolts (24) are installed on both the front and rear sides of the upper surface of the movable frame bar (19).

2. The intaglio printing mold for punching irregular perforations on stamps according to claim 1, characterized in that: The top plate (4) is connected to the upper mold (6) via a hydraulic rod (5) below, the cover plate (10) is located below the upper mold (6), and the upper surface of the lower mold (2) is coated with a release agent with a low coefficient of friction.

3. The intaglio printing mold for punching irregular perforations on stamps according to claim 1, characterized in that: The connecting plate (11) is detachably connected to the cover plate (10) by fixing bolts. A groove (12) is provided on the lower surface of the connecting plate (11). The upper end of the punch (13) is located in the groove (12). The air hole (14) passes through the punch (13). The air collection hood (9) is connected to the groove (12).

4. The intaglio printing mold for punching irregular perforations on stamps according to claim 1, characterized in that: Guide rods (15) are installed on the lower left and right sides of the upper mold (6), and guide sleeves (16) are installed on the upper left and right sides of the lower mold (2). The guide rods (15) and guide sleeves (16) are slidably connected.

5. The intaglio printing mold for punching irregular perforations on stamps according to claim 1, characterized in that: Each slide rail (17) is equipped with a limit rod (18), and the movable frame strip (19) is slidably connected to the limit rod (18) and the slide rail (17).

6. The intaglio printing mold for punching irregular perforations on stamps according to claim 5, characterized in that: The pull rod (22) passes through the movable frame (19), and the pull rod (22) is slidably connected to the movable frame (19). Multiple telescopic springs (20) are provided.

7. The intaglio printing mold for punching irregular perforations on stamps according to claim 1, characterized in that: The limiting groove (23) is provided in multiple ways, and the diameter of the limiting groove (23) is smaller than the diameter of the limiting bolt (24).

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