A porous tablet stamping die and the upper die of the die

Abstract

The present invention relates to a mold, in particular to a mold for powder extrusion molding, and specifically to a porous tablet stamping mold, which includes a turntable. At three positions, namely the upper, middle, and lower positions on the turntable, a set of upper punch dies, forming cavities, and lower punch dies that correspond to each other in position are circumferentially and evenly distributed along the rotation center. The upper punch die includes an upper punch head, and the lower punch die includes a lower punch head. Each time the turntable rotates one week, each upper punch die and lower punch die complete a reciprocating lifting motion. The upper punch die further includes a discharging rod, and the lower punch die further includes a punching rod that is fixed on the turntable and is movably arranged in the lower punch head. The discharging rod can move within the upper punch head, so as to make way for the punching rod during extrusion molding and can also push the powder in the upper punch head out for discharging. With the mold having the above structure, the discharging rod can discharge the excess powder in the upper punch head, avoid the accumulation of powder from blocking the punching rod, and protect the safety and reliability of the punching rod during operation.

Description

Technical Field

[0001] The present invention relates to the field of molds, and particularly to a molding die for porous tablets (such as catalyst tablets). Background Art

[0002] In order to obtain the largest possible specific surface area, catalyst tablets need to be made into a honeycomb-like porous structure. There are also other cases, such as automotive airbag gas-generating tablets, which also require the tablets to be made into a special-shaped porous structure due to their special usage requirements. The traditional method generally makes the lower punch head and the punching rod into an integral structure. Since the punching rod is relatively thin, it is very easy to break when blocked. At the same time, the manufacturing cost is relatively high. Moreover, the traditional upper punch head generally needs to be provided with a relief hole for the punching rod to insert during molding. During production, it is easy for powder to be brought into the relief hole of the upper punch head. When enough powder accumulates, it will block the punching rod, further increasing the risk of the punching rod breaking. Therefore, it needs to be manually cleaned frequently, and the operation is very inconvenient. Summary of the Invention

[0003] In order to solve the problems that the punching rod is easy to break and the opening of the upper punch head in the mold is easy to be blocked in the prior art, the present invention provides a porous tablet stamping die that is durable and can automatically clean the powder in the opening. The technical solution adopted by the present invention is as follows:

[0004] A porous tablet stamping die includes a turntable. At the upper, middle, and lower positions of the turntable, a set of upper punch dies, forming cavities, and lower punch dies that are in one-to-one correspondence in position are circumferentially and evenly distributed along the rotation center. The upper punch die includes an upper punch head, and the lower punch die includes a lower punch head. Each time the turntable rotates one week, each upper punch die and lower punch die complete a reciprocating lifting motion. When the upper punch die moves from a high position to a low position, the upper punch head gradually inserts into the forming cavity from outside the forming cavity, and when the upper punch die moves from a low position to a high position, the upper punch head gradually disengages from the forming cavity. The lower punch head is always in the forming cavity, and when the lower punch die is in the high position, the lower punch head can extend out of the upper end face of the forming cavity. The upper punch die further includes a discharge rod, which is movably arranged in the upper punch head and can perform a reciprocating motion when the turntable is working. When the upper punch die is in the high position, the end of the discharge rod extends out of the lower punch head, and when the upper punch die is in the low position, the end of the discharge rod retracts into the lower punch head. The lower punch die further includes a punching rod fixed on the turntable and movably arranged in the lower punch head. When the upper punch die is in the low position, the punching rod can insert into the upper punch head.

[0005] Further, the rotary table includes a column, an upper guide rail, a lower guide rail, and a rotating table. The upper punch die, the forming cavity, and the lower punch die are respectively arranged in the upper, middle, and lower parts of the rotating table. The upper guide rail and the lower guide rail for driving the upper punch die and the lower punch die to move up and down are respectively fixed at the upper end and the lower end of the column.

[0006] Further, one end of the upper punch die is lapped on the upper guide rail and falls by its own weight, and the upper end face of the bottom of the lower punch die contacts the lower guide rail and falls back by the pulling of the lower guide rail.

[0007] Further, the upper guide rail is an inclined plane guide rail arranged inside each upper punch die, and a step surface capable of being lapped on the upper guide rail is provided on the upper punch die; the lower guide rail is a T-shaped groove, and a T-shaped head placed in the T-shaped groove is provided on the lower punch die.

[0008] Further, a set of set screws corresponding to the positions of the upper punch dies are arranged on the rotating table, and the set screws can abut against the outer sides of the upper punch dies so that the step surfaces are always lapped with the upper guide rails.

[0009] Further, it also includes an upper pressing wheel, a lower pressing wheel, and a blanking wheel. The upper pressing wheel and the lower pressing wheel are respectively located on one side of the tails of the upper punch die and the lower punch die and are fixed at the lowest working position of the upper punch die. The blanking wheel is located on one side of the tail of the lower punch die and is at the highest working position of the lower punch die.

[0010] Further, the upper punch die further includes an upper punch rod and a limit pin. A blanking seat for mounting a blanking rod is movably arranged inside the upper punch rod. The upper punch head is mounted at the end of the upper punch rod. Strip-shaped holes are provided on both the upper punch rod and the blanking seat. The limit pin is fixed on the rotating table and inserted into the strip-shaped holes on the upper punch rod and the blanking seat; the lower punch die further includes a lower punch rod and a positioning pin. A punching seat for mounting a punching rod is movably arranged inside the lower punch rod. A long strip hole is provided on the lower punch rod. The positioning pin is fixed on the rotating table and passes through the long strip hole to fix the punching seat.

[0011] A multi-hole tablet upper punch die includes an upper punch rod, an upper punch head, a blanking rod, and a blanking seat. The upper punch head is mounted at the end of the upper punch rod. The blanking rod is mounted at the end of the blanking seat. The blanking seat is movably arranged inside the upper punch rod. The blanking rod is movably arranged inside the upper punch head. Strip-shaped holes are provided on both the upper punch rod and the blanking seat. A limit pin is arranged in the strip-shaped holes. When the upper punch head moves away from the limit pin, the blanking rod can retract into the upper punch head. When the upper punch head moves towards the positioning pin, the blanking rod can extend out of the upper punch head.

[0012] For the mold adopting the above structure, since the punching rod can extend into the upper punch during molding, better support effect can be provided by the upper punch to avoid breakage of the punching rod. Meanwhile, the discharging rod can discharge the redundant powder in the upper punch, providing sufficient space for the punching rod to avoid accumulation of powder blocking the insertion of the punching rod into the upper punch, further protecting the safety and reliability of the punching rod during operation. Brief Description of the Drawings

[0013] Figure 1 It is a schematic structural view of the mold of the present invention;

[0014] Figure 2 It is a sectional view of the mold of the present invention;

[0015] Figure 3 is Figure 2 a partial enlarged view at A in

[0016] Figure 4 is Figure 2 a partial enlarged view at B in Detailed Description of the Embodiment

[0017] The present invention provides a porous tablet stamping mold, which presses the powder into porous tablets through the mold. The following further describes the mold structure of the present invention in detail with reference to the drawings and specific embodiments. As Figure 1 shown, the mold includes a turntable, which is divided into upper, middle and lower sections. A set of mounting holes are circumferentially and uniformly distributed along the rotation center of the turntable on the outer circles of the upper, middle and lower sections of the turntable. An upper punch die 1 is arranged in the mounting hole of the upper section of the turntable, a forming cavity 2 is arranged in the mounting hole of the middle section of the turntable, and a lower punch die 3 is arranged in the mounting hole of the lower section of the turntable. Among them, the positions of the upper punch dies 1, the forming cavities 2 and the lower punch dies 3 correspond to each other one by one. When the turntable rotates, it can drive the upper punch die 1, the forming cavity 2 and the lower punch die 3 to move synchronously, and during the rotation process, the positional relationship among the upper punch die 1, the forming cavity 2 and the lower punch die 3 always remains corresponding. Among them, the upper punch die 1 and the lower punch die 3 can make reciprocating movements along the axial direction of the rotation axis during the rotation of the turntable. When the turntable rotates one week, the upper punch die 1 and the lower punch die 3 complete one reciprocating action. As Figure 2 and Figure 3 shown, an upper punch head 1-1 is arranged on the upper punch die 1. As Figure 2 and Figure 3A lower punch head 3-1 is provided on the lower punch die 3. The lower punch head 3-1 always moves reciprocally within the forming cavity 2. When the upper punch die 1 moves from the high position to the low position during reciprocating motion, the upper punch head 1-1 gradually inserts into the forming cavity 2 from outside the forming cavity 2. When the upper punch die 1 moves from the low position to the high position, the upper punch head 1-1 gradually disengages from the forming cavity 2. When the upper punch die 1 is at the lowest position, it cooperates with the lower punch die 3 to complete the extrusion and shaping of the powder in the forming cavity 2 to form tablets. During this process, the upper punch head 1-1 extends into the forming cavity 2 to the maximum depth. The lower punch die 3 further includes a punching rod. When the upper punch head 1-1 extends into the forming cavity 2, the punching rod 3-2 in the lower punch die 3 also extends into the upper punch head 1-1 to form a hole in the middle of the tablet during the extrusion forming process. During the forming process, since both ends of the punching rod 3-2 are respectively located inside the lower punch head 3-1 and the upper punch head 1-1 and are supported and protected, it is ensured that the punching rod 3-2 is not easily bent and damaged. After the forming is completed, the upper punch die 1 will gradually rise as the turntable rotates, and finally the upper punch head 1-1 disengages from the forming cavity 2. The upper punch die 1 further includes a discharging rod 1-2. The discharging rod 1-2 is movably arranged inside the upper punch head 1-1 and can also perform reciprocating motion. When the upper punch die 1 is at the low position, the discharging rod 1-2 will retract into the upper punch head 1-1 under the limiting action of the limiting pin 1-4 on the pushing seat 1-5. When the upper punch die 1 moves to the high position, the discharging rod 1-2 will extend out of the upper punch head 1-1 to push out the excess powder pushed into the upper punch head 1-1, avoiding blocking the next insertion of the punching rod 3-2 into the upper punch head 1-1. During the process of the upper punch head 1-1 disengaging from the forming cavity 2, the lower punch die 3 will continue to rise, and the lower punch head 3-1 extends out of the upper end face of the forming cavity 2 to push out the formed tablet from the forming cavity 2 to complete the demolding process.

[0018] As Figure 1In the illustrated embodiment, the turntable includes a column 4 and a rotating table 7. The rotating table 7 is movably arranged on the column 4 and can rotate. The upper punch die 1, the forming cavity 2, and the lower punch die 3 are respectively arranged in the upper, middle, and lower parts of the rotating table 7. In order to enable the upper punch die 1 and the lower punch die 3 to reciprocate when the turntable rotates, an upper guide rail 5 and a lower guide rail 6 are respectively fixed at both ends of the column 4. The upper punch die 1 cooperates with the upper guide rail 5 to achieve a lifting action, and the lower punch die 3 cooperates with the lower guide rail 6 to achieve a lifting action. Specifically, the upper guide rail 5 is an inclined plane guide rail in the form of a cam. A step surface 1-3 is provided on the upper punch die 1. The step surface 1-3 of the upper punch die 1 is lapped on the upper guide rail 5 and moves on the upper guide rail 5 as the rotating table 7 rotates to achieve reciprocating motion. And in order to ensure that the step surface 1-3 is always in good contact with the upper guide rail 5 and does not disengage, a set screw 11 is provided on the rotating table 7 to abut against the outside of the upper punch die 1. The lower guide rail 6 is a T-shaped groove in the form of a cam. A T-shaped head 3-7 is provided on the lower punch die 3 and is placed in the lower guide rail 6. The lower punch die 3 achieves reciprocating motion as the rotating table 7 rotates. In this embodiment, the upper punch die 1 mainly falls by its own weight, while the lower punch die 3 mainly falls by being pulled back by the lower guide rail 6. Of course, when the upper guide rail 5 and the lower guide rail 6 are set as guide chutes, both the upper punch die 1 and the lower punch die 3 can achieve reciprocating motion along a specified route through the limiting and guiding of the upper guide rail 5 and the lower guide rail 6. In this embodiment, when the upper punch die 1 is at its lowest position, the upper punch head 1-1 and the lower punch head 3-1 are in the forming cavity 2 to extrude the powder to make it compressed and formed. At this time, sufficient pressing force is required. However, the upper guide rail 5 and the lower guide rail 6 in this embodiment have no limiting effect and cannot provide sufficient pressing force. Therefore, an upper pressing wheel 8 and a lower pressing wheel 9 are also provided in this stamping die. The upper pressing wheel 8 and the lower pressing wheel 9 are respectively fixedly arranged on one side of the tail ends of the upper punch die 1 and the lower punch die 3, and respectively provide a pressing force on the upper punch die 1 and the lower punch die to enable the upper punch head 1-1 and the lower punch head 3-1 to have sufficient pressure on the powder in the forming cavity 2 to compact and shape the powder into tablets. Therefore, the positions of the upper pressing wheel 8 and the lower pressing wheel 9 are set at positions corresponding to the lowest position of the upper punch die 1. In this embodiment, since the lower punch die 3 cannot be guided upward by the lower guide rail 6, in order to be able to demold the pressed tablets, a knockout wheel 10 is also provided in this die. The knockout wheel 10 is arranged at the tail end of the lower punch die 3 and at the highest position of the lower punch die 3. The lower punch die 3 is lifted by the knockout wheel 10 so that the end face of the lower punch head 3-1 completely extends out of the upper end face of the forming cavity, thereby pushing the tablets in the forming cavity 2 out of the forming cavity 2 to complete demolding. After demolding, the lower punch die 3 is pulled back to the low position by the lower guide rail 6.

[0019] As Figure 3The upper punch die 1 shown includes an upper punch rod 1-7, an upper punch head 1-1, a material pushing seat 1-5, a material discharging rod 1-2, and a limit pin 1-4. The upper punch head 1-1 is installed at the end of the upper punch rod 1-7. The material pushing seat 1-5 is movably arranged inside the upper punch rod 1-7. The material discharging rod 1-2 is installed on the material pushing seat 1-5 and is movably arranged inside the upper punch head 1-1. Strip-shaped holes 1-6 are provided on both the upper punch rod 1-7 and the material pushing seat 1-5. The limit pin 1-4 passes through the strip-shaped holes 1-6 on the upper punch rod 1-7 and the material pushing seat 1-5 and is fixed on the rotary table 7. When the upper punch rod 1-7 moves upward under the guidance of the upper guide rail 5, the limit pin 1-4 will limit the continuous upward movement of the material pushing seat 1-5, thereby driving the material discharging rod 1-2 to extend from the end of the upper punch head, and then discharging the excess material entering the upper punch head 1-1. Generally, the diameter of the punching rod 1-5 is smaller than the inner diameter of the opening of the upper punch head 1-1, and the powder is mostly concentrated on the inner wall of the upper punch head 1-1. The diameter of the material discharging rod 1-2 matches the inner diameter of the opening of the upper punch head 1-1. When the material discharging rod 1-2 extends out of the upper punch head 1-1, it can discharge the excess material attached to the inner wall, so as to achieve a better cleaning effect, avoid the punching rod 3-2 being unable to extend into the upper punch head 1-1 during the next forming, and avoid the punching rod 3-2 being broken during the forming. During the forming (when the upper punch die is in the low position), the limit pin no longer limits the lower end of the strip-shaped hole 1-6 on the material pushing seat 1-5, but lifts the lower material pushing seat 1-5 under the limiting action of the limit pin 1-4 to retract the material discharging rod 1-2 into the upper punch head, so as to make way for the punching rod 3-2 to insert into the upper punch head 1-1.

[0020] As Figure 4 The lower punch die described above includes a lower punch rod 3-3, a lower punch head 3-1, a punching seat 3-5, a punching rod 3-2, and a positioning pin 3-4. Among them, the lower punch rod 3-3 is movably arranged in the mounting hole of the rotary table 7, and the lower punch head 3-1 is fixed at the end of the lower punch rod 3-3. A long strip hole 3-6 is provided on the lower punch rod 3-3. The punching seat 3-5 is movably arranged relative to the lower punch rod 3-3 inside the lower punch rod 3-3. The positioning pin 3-4 passes through the long strip hole 3-6 to fixedly connect the punching seat 3-5 with the rotary table 7. The punching rod 3-2 is fixed on the punching seat 3-5. At this time, the punching rod 3-2 can reciprocate under the action of the lower guide rail 6, the lower pressing wheel 9, and the material pushing wheel 10. Although the height of the punching rod 3-2 remains unchanged, during the downward movement of the upper punch head 1-1, the punching rod 3-2 will be inserted into the upper punch head 1-1 accordingly. The formed tablet is driven by the material pushing wheel 10 to drive the lower punch rod 3-3 to drive the lower punch head 3-1 to move to push the formed tablet out of the forming cavity 2.

Claims

1. A porous tablet stamping die, comprising a rotary table, on which, in the middle and at the lower part, there is a group of upper punch dies (1), forming cavities (2) and lower punch dies (3) that are circumferentially evenly distributed along the rotation center in one-to-one correspondence. The upper punch die (1) includes an upper punch head (1-1), and the lower punch die (3) includes a lower punch head (3-1), characterized in that: For each rotation of the turntable, the upper punch die (1) and the lower punch die (3) complete a reciprocating lifting motion. When the upper punch die (1) moves from a high position to a low position, the upper punch head (1-1) gradually inserts into the forming cavity (2) from outside the forming cavity (2), and when the upper punch die (1) moves from a low position to a high position, the upper punch head (1-1) gradually disengages from the inside of the forming cavity (2). The lower punch head (3-1) is always inside the forming cavity (2), and when the lower punch die (3) is in a high position, the lower punch head (3-1) can extend out of the upper end face of the forming cavity (2). The upper punch die (1) further includes a discharge rod (1-2), and the discharge rod (1-2) is movably arranged inside the upper punch head (1-1) and can perform a reciprocating motion during the operation of the turntable. When the upper punch die (1) is in a high position, the end of the discharge rod (1-2) extends outside the lower punch head (3-1), and when the upper punch die (1) is in a low position, the end of the discharge rod (1-2) retracts into the lower punch head (3-1). The lower punch die (3) further includes a punching rod (3-2) fixed on the turntable and movably arranged inside the lower punch head (3-1). When the upper punch die (1) is in a low position, the punching rod (3-2) can insert into the upper punch head (1-1); the diameter of the punching rod (3-2) is smaller than the diameter of the upper punch head (1-1); the diameter of the discharge rod (1-2) matches the inner diameter of the opening of the upper punch head (1-1). The turntable includes a column (4), an upper guide rail (5), a lower guide rail (6), and a rotating table (7). The upper punch die (1), the forming cavity (2), and the lower punch die (3) are respectively arranged in the upper, middle, and lower parts of the rotating table (7). An upper guide rail (5) and a lower guide rail (6) for driving the upper punch die (1) and the lower punch die (3) to perform a lifting motion are respectively fixed at the upper and lower ends of the column (4). The upper punch die (1) further includes an upper punch rod (1-7) and a limit pin (1-4). A push seat (1-5) for installing the discharge rod (1-2) is movably arranged inside the upper punch rod (1-7). The upper punch head (1-1) is installed at the end of the upper punch rod (1-7). Strip-shaped holes (1-6) are provided on both the upper punch rod (1-7) and the push seat (1-5). The limit pin (1-4) is fixed on the rotating table (7) and inserted into the strip-shaped holes (1-6) on the upper punch rod (1-7) and the push seat (1-5).

2. The porous tablet stamping die according to claim 1, characterized in that: One end of the upper punch die (1) is lapped on the upper guide rail (5) and falls by its own weight, and the upper end face of the bottom of the lower punch die (3) contacts the lower guide rail (6) and falls back by the pulling of the lower guide rail (6).

3. A porous tablet stamping die according to claim 2, characterized in that: The upper guide rail (5) is an inclined plane guide rail arranged inside each upper punch die (1), and a step surface (1-3) capable of lapping on the upper guide rail (5) is provided on the upper punch die (1); the lower guide rail (6) is a T-shaped groove, and a T-shaped head (3-7) placed in the T-shaped groove is provided on the lower punch die (3).

4. A porous tablet stamping die according to claim 3, characterized in that: A set of set screws (11) corresponding to the positions of the respective upper punch dies (1) are provided on the rotary table (7). The set screws (11) can abut against the outer side of the upper punch die (1) so that the stepped surface (1-3) and the upper guide rail (5) are always kept in lap joint.

5. A porous tablet stamping die according to any one of claims 1 to 4, characterized in that: It further includes an upper pressing wheel (8), a lower pressing wheel (9) and a blanking wheel (10). The upper pressing wheel (8) and the lower pressing wheel (9) are respectively located on one side of the tail ends of the upper punch die (1) and the lower punch die (3) and are fixed at the lowest working position of the upper punch die (1). The blanking wheel (10) is located on one side of the tail end of the lower punch die (3) and is at the highest working position of the lower punch die.

6. A porous tablet stamping die according to claim 2, characterized in that: The lower punch die (3) further includes a lower punch rod (3-3) and a positioning pin (3-4). A punch seat (3-5) for installing a punching rod (3-2) is movably arranged in the lower punch rod (3-3). A long hole (3-6) is provided on the lower punch rod (3-3). The positioning pin (3-4) is fixed on the rotary table (7) and passes through the long hole (3-6) to fix the punch seat (3-5).

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