Punch die with replaceable punch

Abstract

The utility model discloses a stamping die with a replaceable punch, which comprises a middle die, an upper punch, a lower punch, a lower die and a lower die, wherein the two sides of the middle die are respectively provided with the upper punch and the lower punch; the upper punch comprises an upper punch main body and an upper punch rod connected with the upper punch main body, one end of the upper punch main body is in contact with an upper pressing wheel of a first tablet press through the upper punch rod, and the other end of the upper punch main body is connected with the middle die; the lower punch comprises a lower punch body and a lower punch rod connected with the lower punch body, one end of the lower punch body makes contact with an upper pressing wheel of a second tablet press through the lower punch rod, and the other end of the lower punch body is connected with the middle die. According to the punching die with the replaceable punch, through the modular design of the fixing pin, the punching nail and the guide key, the punch can be rapidly replaced, and the downtime is shortened; the mirror symmetry pinch roller layout and size consistency ensure uniform stress in the stamping process and improve the quality of finished products; and the punch cap and the guide key are additionally arranged, so that the connection stability of the punch and the middle die is enhanced, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, specifically a stamping die with a replaceable punch. Background Technology

[0002] Currently, in the pharmaceutical manufacturing and related fields, most tablet presses on the market produce tablets by rotating a press die along a press roller. During this process, the die moves up and down along the press roller's guide rails to complete the compression process. Key factors affecting the tablet press's production efficiency include not only the press roller's own rotational speed but also the die carried by the press roller during each rotation. It is worth noting that the die, as a consumable, needs to be replaced periodically. Traditional punches in die structures are usually fixed; when the punch wears out or needs to be replaced with a different shape, the entire die must be disassembled, resulting in low replacement efficiency and high maintenance costs. Utility Model Content

[0003] The purpose of this invention is to provide a die with a replaceable punch to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a die with a replaceable punch, characterized in that it comprises:

[0005] The middle mold has an upper punch and a lower punch on both sides;

[0006] The upper punch includes an upper punch body and an upper punch rod connected to the upper punch body. One end of the upper punch body contacts the upper pressure roller of the first tablet press through the upper punch rod, and the other end is connected to the middle mold.

[0007] The lower punch includes a lower punch body and a lower punch rod connected to the lower punch body. One end of the lower punch body is in contact with the upper pressure roller of the second tablet press through the lower punch rod, and the other end is connected to the middle mold.

[0008] Furthermore, the upper punch also includes an upper fixing pin and an upper punch nail. The upper punch body is connected to the upper punch rod through the upper fixing pin, and the upper punch nail connects the upper punch body and the middle mold.

[0009] Furthermore, the lower punch also includes a lower fixing pin and a lower punch rivet. The lower punch body is connected to the lower punch rod through the lower fixing pin, and the lower punch rivet connects the lower punch body and the middle mold.

[0010] Furthermore, the first tablet press upper pressure roller and the upper punch are arranged in a mirror image opposite to the lower punch and the second tablet press upper pressure roller on both sides of the middle mold.

[0011] Furthermore, the upper pressure rollers of the first tablet press and the upper pressure rollers of the second tablet press are of the same size.

[0012] Furthermore, the outer side of the upper punch is provided with an upper punch cap for connecting it to the upper punch body.

[0013] Furthermore, the upper punch also includes a guide key, which is used to block the upper fixing pin.

[0014] Furthermore, the guide key and the upper punch body are slidably connected, and the guide key can slide to the outside of the upper fixing pin.

[0015] Furthermore, the outer side of the lower punch is provided with a lower punch cap for connecting it to the lower punch body.

[0016] Furthermore, the end faces of the upper punch body and / or the lower punch body away from the middle die are arc-shaped.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This replaceable punch die features a modular design with fixing pins, punches, and guide keys, enabling quick punch replacement and reducing downtime. The mirror-symmetrical layout and consistent dimensions of the pressure rollers ensure uniform force distribution during the stamping process, improving finished product quality. The addition of punch caps and guide keys enhances the connection stability between the punch and the die, reducing maintenance costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional view of the upper punch in an embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional view of the lower punch according to an embodiment of the present invention.

[0022] In the diagram: 1. Upper pressure roller of the first tablet press; 2. Upper punch; 21. Upper punch cap; 22. Upper punch pin; 23. Guide key; 24. Upper fixing pin; 25. Upper punch rod; 26. Upper punch body; 3. Middle mold; 4. Lower punch; 41. Lower punch cap; 42. Lower punch pin; 44. Lower fixing pin; 45. Lower punch rod; 46. Lower punch body; 5. Upper pressure roller of the second tablet press. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1 A replaceable punch die includes a middle die 3 and an upper punch 2 and a lower punch 4 disposed on both sides of the middle die 3. The upper punch 2 includes an upper punch body 26 and an upper punch rod 25 connected to the upper punch body 26. One end of the upper punch body 26 contacts the upper pressure roller 1 of a first tablet press via the upper punch rod 25, and the other end is connected to the middle die 3. The lower punch 4 includes a lower punch body 46 and a lower punch rod 45 connected to the lower punch body 46. One end of the lower punch body 46 contacts the upper pressure roller 5 of a second tablet press via the lower punch rod 45, and the other end is connected to the middle die 3. In this embodiment, the movable connection between the upper punch body 26 and the upper punch rod 25, and between the lower punch body 46 and the lower punch rod 45, enables rapid replacement of the upper punch 2 and the lower punch 4. When the punches are worn or need to be replaced with punches of different shapes, it is no longer necessary to disassemble the entire die, effectively improving replacement efficiency, reducing maintenance costs, and significantly reducing downtime.

[0025] The middle mold 3 is made of high-hardness alloy material, and its internal punching diameter is adapted to tablets of different diameters (e.g., To meet the forming requirements of small tablets, for example, by simultaneously reducing the diameter of the upper punch 2 and the lower punch 4, the number of tablets that can be punched per unit time during the continuous operation of the rotary tablet press is significantly increased, with a yield increase of 30% to 50% compared to the standard punch structure. At the same time, the diameter of the upper punch 2 and the lower punch 4 can also be increased to meet the forming requirements of large-sized tablets.

[0026] Preferred, such as Figure 2 As shown, the upper punch 2 also includes an upper fixing pin 24 and an upper punch 22. The upper punch body 26 is connected to the upper punch rod 25 through the upper fixing pin 24, and the upper punch 22 connects the upper punch body 26 and the middle mold 3.

[0027] Preferred, such as Figure 3 As shown, the lower punch 4 also includes a lower fixing pin 44 and a lower punch 42. The lower punch body 46 is connected to the lower punch rod 45 through the lower fixing pin 44, and the lower punch 42 connects the lower punch body 46 and the middle mold 3.

[0028] Preferably, the upper pressure roller 1 and upper punch 2 of the first tablet press are arranged in a mirror image opposite to the lower punch 4 and the upper pressure roller 5 of the second tablet press on both sides of the middle mold 3.

[0029] Preferably, the dimensions of the first tablet press upper pressure roller 1 and the second tablet press upper pressure roller 5 are the same. In this embodiment, the dimensions of the first tablet press upper pressure roller 1 and the second tablet press upper pressure roller 5 are the same, and the lower punch 4 and the upper punch 2 are arranged in a mirror-symmetrical manner on both sides of the middle die 3. The mirror-symmetrical layout and consistent dimensions of the pressure rollers ensure uniform force during the stamping process, which helps to improve the quality of the finished product. The first tablet press upper pressure roller 1 is fixed to the top of the upper punch 2, and the second tablet press upper pressure roller 5 is fixed to the bottom of the lower punch 4. The symmetrical layout of the two pressure rollers 1 and 5 ensures that the upper punch 2 and the lower punch 4 are subjected to force synchronously during rotation, avoiding die wear or tablet forming defects caused by uneven pressure distribution.

[0030] In this embodiment, the upper punch 2 and the lower punch 4 are respectively disposed on both sides of the middle mold 3, and are formed into a coaxial rigid connection through precision machining; the middle mold 3 is inserted into the ends of the upper punch 2 and the lower punch 4, and quick assembly and disassembly are achieved through the limiting of the slot. The upper pressure roller 1 and the upper punch 2 of the first tablet press are mirror-opposite to the lower punch 4 and the upper pressure roller 5 of the second tablet press, with the middle mold 3 as the center, forming a bidirectional pressing force, so that the material is subjected to synchronous compression from above and below during the pressing process, thereby improving the density of the tablets.

[0031] Preferably, the end faces of the upper punch body 26 and / or the lower punch body 46 away from the intermediate die 3 are arc-shaped. In this embodiment, the top end face of the upper punch body 26 and the bottom end face of the lower punch body 46 are as follows: Figure 2 and Figure 3 The arc shape shown is adapted to the edge forming requirements of small-diameter tablets. In one embodiment, the radial dimension of a single set of punches can be reduced overall, increasing the number of punch sets from the standard 51 or 83 sets to 101 sets, and all three die specifications (51 / 83 / 101) are compatible with the same equipment. The increase in the number of dies directly increases the punching frequency per unit time, and with the tablet press speed remaining constant, the total output can be increased by 30% to 50%.

[0032] Preferably, the outer side of the upper punch 22 is provided with an upper punch cap 21 for connecting it to the upper punch body 26.

[0033] Preferably, the upper punch 2 also includes a guide key 23, which is used to block the upper fixing pin 24.

[0034] Preferably, the guide key 23 and the upper punch body 26 are slidably connected, and the guide key 23 can slide to the outside of the upper fixing pin 24.

[0035] Preferably, the outer side of the lower punch 42 is provided with a lower punch cap 41 for connecting it to the lower punch body 46.

[0036] Please see Figure 2 and Figure 3The top of the upper punch body 26 is connected to an upper punch rod 25. The top of the upper punch rod 25 is used to contact the upper pressure roller 1 of the first tablet press. The upper pressure roller 1 of the first tablet press can drive the overall displacement of the punch die. The upper fixing pin 24 is used to fix the upper punch rod 25 and the upper punch body 26. After the upper fixing pin 24 is removed, the upper punch rod 25 will fall off. This design is used for replacing the upper punch rod 25. Similarly, the bottom of the lower punch body 46 is connected to a lower punch rod 45. The bottom of the lower punch rod 45 is used to contact the upper pressure roller 5 of the second tablet press. The material is placed between the upper pressure roller 5 of the second tablet press and the lower punch rod 45. The lower fixing pin 44 is used to fix the lower punch rod 45 and the lower punch body 46. After the lower fixing pin 44 is removed, the lower punch rod 45 will fall off. This design is used for replacing the lower punch rod 25.

[0037] The upper fixing pin 24 connects the upper punch 25 and the upper punch body 26, and the upper punch screw 22 connects the upper punch cap 21 and the middle die 3. The design of the upper fixing pin 24 and the upper punch screw 22 effectively prevents the top of the upper punch 2 from being subjected to excessive downward pressure during the punching process, which could cause the top of the upper punch 2 to bend and thus affect the service life of the device. Similarly, the lower fixing pin 44 connects the lower punch 45 and the lower punch body 46, and the lower punch screw 42 connects the lower punch cap 41 and the middle die 3. The design of the lower fixing pin 44 and the lower punch screw 42 effectively prevents the bottom of the lower punch 4 from being subjected to excessive downward pressure during the punching process, which could cause the bottom of the lower punch 4 to bend and thus affect the service life of the device.

[0038] The presence of the upper punch 22 and the lower punch 42 strengthens the upper punch 2 and the lower punch 4, preventing them from bending easily. An upper punch cap 21 is provided on the outer side of the upper punch 22 to secure it, ensuring a stable connection between the upper punch 22 and the upper punch 2. A guide key 23 is also provided on the upper punch body 26 to close the upper fixing pin 24, preventing it from detaching. The upper punch 25 and the upper punch body 26 can cause the upper punch 25 to detach unexpectedly. The guide key 23 is used to block the upper fixing pin 24. The guide key 23 and the upper punch body 26 are slidably connected. The guide key 23 can slide to the outside of the upper fixing pin 24. During installation, the guide key 23 can be moved to another position, and then the upper fixing pin 24 can be inserted to stabilize the upper punch 25. After that, the guide key 23 can be reset. The reverse process is performed when the upper punch 25 needs to be disassembled. This compact design reduces the gap between the punches and dies, allowing the punch plate to accommodate more dies while ensuring the stability and repeatability of the stamping action. The above embodiments are typical examples of this utility model. In actual applications, the die material or surface treatment process can be adjusted based on specific production needs.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A die with a replaceable punch, characterized in that, include: The middle mold (3) is provided with an upper punch (2) and a lower punch (4) on both sides; The upper punch (2) includes an upper punch body (26) and an upper punch rod (25) connected to the upper punch body (26). One end of the upper punch body (26) is in contact with the upper pressure roller (1) of the first tablet press through the upper punch rod (25), and the other end is connected to the middle mold (3). The lower punch (4) includes a lower punch body (46) and a lower punch rod (45) connected to the lower punch body (46). One end of the lower punch body (46) is in contact with the upper pressure roller (5) of the second tablet press through the lower punch rod (45), and the other end is connected to the middle mold (3).

2. A die with a replaceable punch according to claim 1, characterized in that: The upper punch (2) also includes an upper fixing pin (24) and an upper punch (22). The upper punch body (26) is connected to the upper punch rod (25) through the upper fixing pin (24), and the upper punch (22) connects the upper punch body (26) and the middle mold (3).

3. A die with a replaceable punch according to claim 2, characterized in that: The lower punch (4) also includes a lower fixing pin (44) and a lower punch (42). The lower punch body (46) is connected to the lower punch rod (45) through the lower fixing pin (44), and the lower punch (42) connects the lower punch body (46) and the middle mold (3).

4. A die with a replaceable punch according to any one of claims 1 to 3, characterized in that: The first tablet press upper pressure roller (1) and the upper punch (2) are arranged in mirror image opposite to the lower punch (4) and the second tablet press upper pressure roller (5) on both sides of the middle mold (3).

5. A die with a replaceable punch according to claim 4, characterized in that: The first tablet press upper pressure roller (1) and the second tablet press upper pressure roller (5) have the same size.

6. A die with a replaceable punch according to claim 4, characterized in that: The outer side of the upper punch (22) is provided with an upper punch cap (21) for connecting it to the upper punch body (26).

7. A die with a replaceable punch according to claim 3, characterized in that: The upper punch (2) also includes a guide key (23), which is used to block the upper fixing pin (24).

8. A die with a replaceable punch according to claim 7, characterized in that: The guide key (23) and the upper punch body (26) are slidably connected, and the guide key (23) can slide to the outside of the upper fixing pin (24).

9. A die with a replaceable punch according to any one of claims 6 to 8, characterized in that: The outer side of the lower punch (42) is provided with a lower punch cap (41) for connecting it to the lower punch body (46).

10. A die with a replaceable punch according to claim 4, characterized in that: The end faces of the upper punch body (26) and / or the lower punch body (46) away from the middle mold (3) are arc-shaped.

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