Double-pressing type rotary tablet press

Abstract

The invention relates to the field of tablet presses, in particular to a double-pressing type rotary tablet press which comprises a forming die, an upper die column and a lower die column. The forming die is provided with a forming sliding cavity, the forming sliding cavity is arranged in a penetrating mode in the vertical direction, the upper die column and the lower die column are both in sliding fit with the forming sliding cavity in the vertical direction, the upper die column is located at the top of the lower die column, and cleaning air holes are formed in the inner wall of the forming sliding cavity. And the cleaning air holes are used for sucking or blowing air into the forming sliding cavity. The mold has the effect of reducing medicine powder remaining in the mold in the operation process of the double-pressure type rotary tablet press.

Description

Technical Field

[0001] The present application relates to the field of tablet presses, and in particular to a double-pressing rotary tablet press. Background Art

[0002] A tablet press is a device commonly used in the pharmaceutical field. It mainly applies pressure to drug powder so that the powder is pressed into tablets of the desired shape, so that the powder can exert its medicinal effect in the designated area.

[0003] In the prior art, a tablet press generally includes a mold, an upper mold column and a lower mold column. A molding slide cavity is provided inside the mold, and both the upper mold column and the lower mold column slide and fit in the molding slide cavity, and the upper mold column is located on the top of the lower mold column, and the bottom of the upper mold column, the top of the lower mold column and the inner wall of the molding slide cavity enclose a tablet molding cavity, which is used to mold tablets.

[0004] When forming a tablet, first add the powder into the forming slide cavity, and the powder is carried by the lower die column. Then the upper die column and the lower die column approach each other and press the powder, so that the powder is formed in the tablet forming cavity.

[0005] Specifically, please refer to the invention patent with publication number CN 115771298 A, which discloses a tablet pressing mechanism of a rotary tablet press. The technical solution is roughly as follows: the mold, a plurality of upper mold columns and a plurality of lower mold columns are driven by a motor to rotate synchronously, and two guide plates fixedly arranged on the frame and having curved guide slide grooves inside are used to make a plurality of upper mold columns and a plurality of lower mold columns that slide and cooperate with the guide slide grooves to achieve periodic lifting and lowering during the rotation process, thereby realizing the cycle of powder loading, powder extrusion, tablet ejection and tablet discharging in a 360° rotation cycle.

[0006] The above-mentioned tablet press, also known as a double-press rotary tablet press, usually runs at a faster speed and can produce multiple tablets simultaneously in one rotation cycle according to the number of molding slide cavities opened by the mold. It has significant advantages in production efficiency and is therefore widely used.

[0007] Regarding the above-mentioned related technologies, due to the high operating speed, after a long period of operation, a large amount of unformed drug powder is likely to remain in the forming slide cavity of the mold of the double-press rotary tablet press. On the one hand, these residual drug powders will interfere with the movement of the upper mold column and the lower mold column, and on the other hand, they will also affect the gram weight of the tablets produced subsequently. Therefore, the double-press rotary tablet press usually requires more frequent maintenance, which has a greater impact on production efficiency. Summary of the invention

[0008] In order to reduce the amount of drug powder remaining inside a mold during the operation of a double-pressing rotary tablet press, the present application provides a double-pressing rotary tablet press.

[0009] The present application provides a double-press rotary tablet press adopts the following technical solution: A double-pressing rotary tablet press comprises a forming die, an upper die column and a lower die column; The molding mold is provided with a molding slide cavity, and the molding slide cavity is arranged to penetrate in the vertical direction. The upper mold column and the lower mold column are both slidably matched in the molding slide cavity in the vertical direction. The upper mold column is located on the top of the lower mold column. The inner wall of the molding slide cavity is provided with a cleaning air hole, and the cleaning air hole is used to suck or blow air into the molding slide cavity.

[0010] By adopting the above technical solution, the air holes are cleaned to suck or blow air into the forming slide cavity, so that the medicine powder remaining in the forming slide cavity is sucked or blown away, thereby reducing the medicine powder remaining inside the mold during the operation of the double-press rotary tablet press.

[0011] Optionally, the forming slide cavity comprises a bottom slide cavity and a top slide cavity, the bottom slide cavity is located at the bottom of the top slide cavity, the bottom slide cavity is used to provide space for the compression forming of the tablet, and the cleaning pores are located in the top slide cavity.

[0012] By adopting the above technical solution, after the tablet is formed in the bottom slide cavity, it is continuously lifted up by the lower mold column to the top slide cavity, and the residual powder is cleaned through the cleaning holes, so that the tablet forming and cleaning processes are more coherent, which is beneficial to ensure production efficiency and also makes the structure of the double-pressing rotary tablet press more compact.

[0013] Optionally, the diameter of the top sliding cavity is greater than the diameter of the bottom sliding cavity, and after the tablet is pressed and formed in the bottom sliding cavity, the inner wall of the bottom sliding cavity fits tightly against the tablet.

[0014] By adopting the above technical solution, when the air holes are cleaned for suction or blowing, the tablets are reversed in the top sliding cavity, so that the powder at the bottom of the tablets or between the tablets and the inner wall of the top sliding cavity can be fully cleaned, which is beneficial to ensure the cleaning effect.

[0015] Optionally, a sealing ring is provided on the inner wall of the top sliding cavity, and the sealing ring is tightly fitted on the upper mold column.

[0016] The adoption of the above technical solution is helpful to reduce the leakage of medicine powder from the top sliding cavity.

[0017] Optionally, the double-pressing rotary tablet press further comprises a cleaning pneumatic part, wherein the cleaning pneumatic part is provided with active air holes, and the active air holes are used to generate negative pressure or positive pressure; The molding slide cavity and the cleaning air holes are both provided with a plurality of them, and the plurality of the cleaning air holes are arranged on the inner wall of each molding slide cavity, and the plurality of the cleaning air holes are connected to the active air holes in sequence through the rotation of the molding mold.

[0018] By adopting the above technical solution, each forming slide cavity is connected to the cleaning pneumatic parts in turn, so that a small number of cleaning pneumatic parts can clean the powder in a large number of forming slide cavities, which is beneficial to reduce the number of wires and facilitate wiring and inspection and maintenance.

[0019] Optionally, the forming mold is provided with connecting air holes, the connecting air holes extend along the rotation direction of the forming mold, the connecting air holes are connected to the cleaning air holes, and the cleaning air holes are connected to the active air holes through the connecting air holes.

[0020] By adopting the above technical solution, the connecting air hole increases the time for the cleaning air hole to be connected to the active air hole, so that the cleaning air hole has enough time to blow or inhale air into the forming slide cavity, which is beneficial to ensure the cleaning effect of the powder.

[0021] Optionally, the double-pressing rotary tablet press further comprises a sealing ring, which is tightly fitted in the forming die, and the sealing ring cover is arranged on the connecting air hole.

[0022] The adoption of the above technical solution is helpful to reduce the occurrence of self-cleaning pore leakage of medicine powder before the medicine powder is formed.

[0023] Optionally, the molding die is provided with a ring body embedding groove, the ring body embedding groove is connected to the connecting air hole, and the sealing ring is embedded in the ring body embedding groove.

[0024] By adopting the above technical solution, it is beneficial to increase the contact area between the sealing ring and the forming mold, thereby making it more difficult for the medicine powder to leak.

[0025] Optionally, the cleaning air holes are provided in plurality, and the plurality of cleaning air holes are divided into negative pressure air holes and positive pressure air holes; The negative pressure air hole is used to suck air into the forming sliding cavity, and the positive pressure air hole is used to blow air into the forming sliding cavity. The negative pressure air hole is located at the top of the positive pressure air hole.

[0026] By adopting the above technical solution, the positive pressure air hole first blows air into the forming slide cavity, so that the tablets and residual powder in the forming slide cavity are blown up, reducing the occurrence of powder adhesion. Then, the blown powder is sucked away by the negative pressure air hole, which is conducive to ensuring the cleaning effect of the powder.

[0027] Optionally, the double-pressing rotary tablet press further comprises a cleaning pneumatic part, wherein the cleaning pneumatic part is provided with active air holes, and the active air holes are used to generate negative pressure or positive pressure; The cleaning pneumatic parts are provided with a plurality of them, and the plurality of the cleaning pneumatic parts are divided into negative pressure pneumatic parts and positive pressure pneumatic parts, the active air holes of the negative pressure pneumatic parts are used to generate negative pressure, and the active air holes of the positive pressure pneumatic parts are used to generate positive pressure; The molding slide cavity and the cleaning air holes are provided with a plurality of them, and the plurality of the cleaning air holes are provided on the inner wall of each molding slide cavity, and the plurality of the cleaning air holes are connected to the active air holes of the positive pressure pneumatic part and the active air holes of the negative pressure pneumatic part in sequence through the rotation of the molding mold.

[0028] By adopting the above technical solution, when the positive pressure air hole blows air to the tablet, the upper die column and the lower die column limit the shaking of the tablet, which can reduce the situation where the tablet shakes too much and causes damage or affects the discharge. Therefore, by staggering the positive pressure pneumatic parts and the negative pressure pneumatic parts, it will be helpful to reduce the distance between the upper die column and the lower die column, thereby reducing the situation where the tablet shakes too much and causes damage or affects the discharge.

[0029] In summary, the present application includes at least one of the following beneficial technical effects: 1. The air holes are cleaned to suck or blow air into the forming slide cavity, so that the powder remaining in the forming slide cavity is sucked or blown away, thereby reducing the powder remaining inside the mold during the operation of the double-press rotary tablet press; 2. After the tablet is formed in the bottom slide cavity, it is lifted up by the lower die column to the top slide cavity, and the residual powder is cleaned through the cleaning pores, making the tablet forming and cleaning process more coherent, which is conducive to ensuring production efficiency and making the structure of the double-press rotary tablet press more compact; 3. First, the positive pressure air hole blows air into the forming slide cavity, so that the tablets and residual powder in the forming slide cavity are blown up, reducing the occurrence of powder adhesion. Then the blown powder is sucked away through the negative pressure air hole, which is conducive to ensuring the cleaning effect of the powder; 4. When the positive pressure air hole blows air to the tablet, the upper die column and the lower die column limit the shaking of the tablet, which can reduce the situation where the tablet shakes too much and causes damage or affects the discharge. Therefore, by staggering the positive pressure pneumatic parts and the negative pressure pneumatic parts, it will be helpful to reduce the distance between the upper die column and the lower die column, thereby reducing the situation where the tablet shakes too much and causes damage or affects the discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an overall schematic diagram of the guide plate, sliding plate and forming mold of the embodiment of the present application.

[0031] Figure 2 It is an overall schematic diagram of the molding die of the embodiment of the present application.

[0032] Figure 3 It is a schematic cross-sectional view of a molding die during tablet molding in an embodiment of the present application.

[0033] Figure 4 yes Figure 3 An enlarged schematic diagram of part A.

[0034] Figure 5 It is a schematic cross-sectional view of the molding die during positive pressure air hole blowing in an embodiment of the present application.

[0035] Figure 6 It is a schematic cross-sectional view of the molding mold during air suction by the negative pressure air holes in the embodiment of the present application.

[0036] Figure 7 It is a schematic cross-sectional view of the molding die when the tablets are ejected according to the embodiment of the present application.

[0037] Explanation of the reference numerals: 1. Guide plate; 2. Sliding plate; 3. Forming mold; 301. Bottom sliding cavity; 302. Top sliding cavity; 303. Negative pressure air hole; 304. Positive pressure air hole; 305. Connecting air hole; 306. Ring body groove; 31. Sealing ring; 4. Upper mold column; 5. Lower mold column; 6. Cleaning pneumatic parts; 601. Active air hole; 7. Sealing ring. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-7 This application is described in further detail.

[0039] The present application embodiment discloses a double-pressing rotary tablet press. Figure 1 The double-pressing rotary tablet press includes a guide plate 1, a sliding plate 2, a forming mold 3, an upper mold column 4 and a lower mold column 5.

[0040] Reference Figure 1 There are two guide plates 1, which are distributed in the vertical direction and are fixedly mounted on the frame (not shown in the figure). A guide slide is provided inside the guide plate 1, which is in a circular shape and closed at the beginning and the end, and the guide slide is provided with a plurality of bending sections bent in the vertical direction (not shown in the figure). There are two sliding plates 2, which are distributed in the vertical direction and are located between the two guide plates 1.

[0041] The sliding plate 2 is cylindrically arranged, and eight plate body chute grooves are opened through the sliding plate 2, and the eight plate body chute grooves are evenly distributed around the axis of the sliding plate 2. The forming mold 3 is located between the two sliding plates 2, and the forming mold 3 is cylindrically arranged. The top and bottom of the forming mold 3 are coaxially fixedly connected to the sliding plate 2, so that the forming mold 3 and the two sliding plates 2 rotate synchronously. The sliding plate 2 is coaxially fixedly connected with a rotating shaft, and the rotating shaft is connected to a motor (not shown in the figure), so that the forming mold 3 and the two sliding plates 2 are driven by the motor to rotate synchronously.

[0042] Reference Figure 1 There are eight upper mold columns 4, and the tops of the eight upper mold columns 4 are all slidably matched in the guide grooves of the guide plate 1 located at the top, and the eight upper mold columns 4 are respectively slidably penetrated through the sliding plates 2 located at the top, so that the tops of the upper mold columns 4 are driven to slide along the guide grooves through the rotation of the sliding plates 2, so that the upper mold columns 4 can be lifted and lowered in the vertical direction through the bending section of the guide grooves.

[0043] There are eight lower mold columns 5, and the bottoms of the eight lower mold columns 5 are all slidably matched in the guide grooves of the guide plate 1 located at the bottom, and the eight lower mold columns 5 are respectively slidably penetrated through the sliding plates 2 located at the bottom, so that the bottoms of the lower mold columns 5 can be driven to slide along the guide grooves through the rotation of the sliding plates 2, and then the lower mold columns 5 can be lifted and lowered in the vertical direction through the bending section of the guide grooves, so that the upper mold column 4 and the lower mold column 5 can move towards or away from each other in the vertical direction during the rotation process through the rotation of the guide plate 1.

[0044] Reference Figure 1 and Figure 2 The forming die 3 is provided with eight forming slide cavities for forming the powder into tablets. The eight forming slide cavities are respectively arranged corresponding to the slide grooves of the sliding plate 2, and the eight forming slide cavities are all arranged through the vertical direction. The bottom of the upper mold column 4 slides in the vertical direction to fit in the forming slide cavity, and the top of the lower mold column 5 slides in the vertical direction to fit in the forming cavity, so that the powder is pressed in the forming cavity to form tablets through the sliding movement of the upper mold column 4 and the lower mold column 5 in the forming slide cavity.

[0045] Reference Figure 3 and Figure 4 The molding slide cavity includes a bottom slide cavity 301 and a top slide cavity 302, and the bottom slide cavity 301 is located at the bottom of the top slide cavity 302. The shape of the bottom slide cavity 301 corresponds to the molded tablet, so that the powder is pressed in the bottom slide cavity 301, so that the powder is molded into a tablet of a corresponding shape in the bottom slide cavity 301, that is, after the tablet is pressed and molded in the bottom slide cavity 301, the inner wall of the bottom slide cavity 301 is tightly matched with the tablet. The diameter of the top slide cavity 302 is larger than the diameter of the bottom slide cavity 301, and when the tablet moves to the top slide cavity 302, there is a gap between the inner wall of the top slide cavity 302 and the tablet, so that the tablet can shake in the top slide cavity 302, thereby exposing the powder adhering to the surface of the tablet or the inner wall of the top slide cavity 302. In addition, a sealing ring 31 is provided on the inner wall of the top slide cavity 302, and the sealing ring 31 is elastic. When the medicine powder is pressurized and lifted, the sealing ring 31 is tightly fitted against the outer peripheral surface of the upper mold column 4 , so that the medicine powder is not easy to leak from the top sliding cavity 302 .

[0046] Reference Figure 4The inner wall of the forming slide cavity is provided with two cleaning air holes, so that air can be blown or sucked into the forming slide cavity through the cleaning air holes, thereby blowing away or sucking away the residual powder in the cleaning air holes. Specifically, in this embodiment, the two cleaning air holes are divided into a negative pressure air hole 303 and a positive pressure air hole 304, and the negative pressure air hole 303 is located at the top of the positive pressure air hole 304. The negative pressure air hole 303 is used to suck air into the forming slide cavity, and the positive pressure air hole 304 is used to blow air into the forming slide cavity, so that the tablets can be reversed through the positive pressure air hole 304, thereby blowing away and blowing up the powder remaining on the surface of the tablets and the inner wall of the forming slide cavity, and the blown away and blown up powder is sucked away and removed through the negative pressure air hole 303, thereby ensuring the cleaning effect of the powder.

[0047] Reference Figure 2 and Figure 4 The outer peripheral surface of the forming mold 3 is provided with a plurality of connecting air holes 305, which are respectively connected to each negative pressure air hole 303 and each positive pressure air hole 304, so that negative pressure is generated in the negative pressure air hole 303 through the connecting air holes 305, or positive pressure is generated in the positive pressure air hole 304 through the connecting air holes 305, so that the negative pressure air hole 303 is convenient for suction and the positive pressure air hole 304 is convenient for blowing. The connecting air holes 305 extend along the rotation direction of the forming mold 3, so as to increase the length of the connecting air holes 305.

[0048] Reference Figure 1 and Figure 2 The double-pressing rotary tablet press also includes a cleaning pneumatic part 6 and a sealing ring 7, and two cleaning pneumatic parts 6 and two sealing rings 7 are provided. The outer peripheral surface of the forming mold 3 is provided with two ring body embedding grooves 306, and the two ring body embedding grooves 306 are arranged in a circular ring shape, and the two ring body embedding grooves 306 are distributed in the vertical direction. A plurality of negative pressure air holes 303 are connected to the ring body embedding groove 306 at the top, and a plurality of positive pressure air holes 304 are connected to the ring body embedding groove 306 at the bottom, so that negative pressure is generated in the negative pressure air hole 303 through the ring body embedding groove 306 at the top, and positive pressure is generated in the positive pressure air hole 304 through the ring body embedding groove 306 at the bottom. One side of the blocking ring 7 is fixedly connected to the frame (not shown in the figure), and the other side of the blocking ring 7 is embedded in the ring body embedding groove 306, and the other side of the blocking ring 7 is covered on the connecting air hole 305, so that the connecting air hole 305 can be blocked by the blocking ring 7, thereby preventing the powder from leaking.

[0049] Two cleaning pneumatic parts 6 are detachably mounted on each sealing ring 7, respectively, so as to facilitate replacement of the cleaning pneumatic parts 6. Active air holes 601 are provided throughout the cleaning pneumatic parts 6. The active air holes 601 of the cleaning pneumatic parts 6 at the top are connected to a negative pressure device (not shown in the figure) to generate negative pressure, and the cleaning pneumatic parts 6 at the bottom are connected to a positive pressure device (not shown in the figure) to generate positive pressure. The cleaning pneumatic parts 6 at the top and the cleaning pneumatic parts 6 at the bottom are distributed circumferentially along the axis of the forming mold 3, so that through the rotation of the forming mold 3, the forming slide cavity is first connected to the active air holes 601 at the bottom through the positive pressure holes 304 and the connecting holes 305, and then connected to the active air holes 601 at the bottom through the negative pressure holes 303 and the connecting holes 305, so that the inside of the forming slide cavity is first blown through the cleaning pneumatic parts 6 at the bottom, and then the inside of the forming slide cavity is sucked through the cleaning pneumatic parts 6 at the top.

[0050] The implementation principle of a double-pressing rotary tablet press in the embodiment of the present application is: S1: A fixed amount of medicine powder is filled into the molding slide cavity through a feeding device (not shown in the figure), and then the molding mold 3 rotates, and the upper mold column 4 is vertically inserted into the molding slide cavity through the guide plate 1 located at the top, and the lower mold column 5 is vertically slid downward through the guide plate 1 located at the bottom, thereby driving the medicine powder to move to the bottom slide cavity 301.

[0051] S2, reference Figure 3 The forming mold 3 continues to rotate, driving the lower mold column 5 to move downward, and driving the upper mold column 4 to move downward, so that the medicine powder in the bottom slide cavity 301 is squeezed by the lower mold column 5 and the upper mold column 4, so that the medicine powder is pressed into tablets in the bottom slide cavity 301.

[0052] S3. Reference Figure 5 The forming mold 3 continues to rotate, driving the lower mold column 5 to move upward, and driving the upper mold column 4 to move upward at a faster speed than the lower mold column 5, so that the upper mold column 4 is away from the top of the tablet until the positive pressure air hole 304 is connected to the active air hole 601 of the cleaning pneumatic part 6 located at the bottom.

[0053] When the tablet is lifted to the top sliding cavity 302 and close to the positive pressure air hole 304, the cleaning pneumatic part 6 at the bottom generates positive pressure through the positive pressure device (not shown in the figure), so that the positive pressure air hole 304 blows air into the top sliding cavity 302. Under the action of the airflow, the tablet shakes through the gap between the tablet and the top sliding cavity 302, so that the unformed powder adhering to the surface of the tablet and the powder remaining in the top sliding cavity 302 are blown away, scattered and blown up.

[0054] S4, the forming mold 3 continues to rotate, driving the lower mold column 5 to continue to move upward, and driving the upper mold column 4 to move upward at the same speed as the lower mold column 5, until the negative pressure air hole 303 is connected to the active air hole 601 of the cleaning pneumatic part 6 located at the top.

[0055] When the tablet is lifted to a position close to the negative pressure air hole 303, the cleaning pneumatic part 6 at the top generates negative pressure through the negative pressure device (not shown in the figure), so that the negative pressure air hole 303 sucks air into the top sliding cavity 302. The medicine powder in the blowing state or the attached state in the top sliding cavity 302 is sucked away by the negative pressure air hole 303, thereby reducing the medicine powder remaining in the mold during the operation of the double-pressing rotary tablet press.

[0056] S5. Reference Figure 7 , the forming mold 3 continues to rotate, driving the lower mold column 5 and the upper mold column 4 to continue to move upward, so that the upper mold column 4 is separated from the top slide cavity 302, and the tablet is pushed from the top slide cavity 302 to the top surface of the forming mold 3 through the lower mold column 5.

[0057] S6, the forming mold 3 continues to rotate, and a lever (not shown in the figure) arranged horizontally and tilted on the top of the forming mold 3 is used to block the tablets on the top of the forming mold 3 during the rotation process, so that the tablets move along the lever to the tablet collection place.

[0058] S7, the molding die 3 continues to rotate, and the lower mold column 5 and the upper mold column 4 are restored to the positions in step S1, thereby completing the molding cycle of a single tablet in a single molding cavity.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A double-pressing rotary tablet press, characterized in that: It comprises a forming die (3), an upper die column (4) and a lower die column (5); The molding die (3) is provided with a molding slide cavity, and the molding slide cavity is arranged to penetrate in the vertical direction. The upper mold column (4) and the lower mold column (5) are both slidably matched in the molding slide cavity in the vertical direction. The upper mold column (4) is located on the top of the lower mold column (5). The inner wall of the molding slide cavity is provided with a cleaning air hole, and the cleaning air hole is used to suck or blow air into the molding slide cavity.

2. A double-pressing rotary tablet press according to claim 1, characterized in that: The molding slide cavity comprises a bottom slide cavity (301) and a top slide cavity (302), wherein the bottom slide cavity (301) is located at the bottom of the top slide cavity (302), and the bottom slide cavity (301) is used to provide space for the compression molding of the tablet, and the cleaning air hole is located in the top slide cavity (302).

3. A double-pressing rotary tablet press according to claim 2, characterized in that: The diameter of the top sliding cavity (302) is greater than the diameter of the bottom sliding cavity (301). After the tablet is pressed and formed in the bottom sliding cavity (301), the inner wall of the bottom sliding cavity (301) fits tightly against the tablet.

4. A double-pressing rotary tablet press according to claim 3, characterized in that: The inner wall of the top sliding cavity (302) is provided with a sealing ring (31), and the sealing ring (31) is tightly fitted on the upper mold column (4).

5. A double-pressing rotary tablet press according to claim 1, characterized in that: The double-pressing rotary tablet press also includes a cleaning pneumatic part (6), wherein the cleaning pneumatic part (6) is provided with an active air hole (601) extending therethrough, and the active air hole (601) is used to generate negative pressure or positive pressure; The molding slide cavity and the cleaning air holes are both provided with a plurality of them. The plurality of cleaning air holes are provided on the inner wall of each molding slide cavity. The plurality of cleaning air holes are connected to the active air holes (601) in sequence through the rotation of the molding die (3).

6. A double-pressing rotary tablet press according to claim 5, characterized in that: The forming mold (3) is provided with a connecting air hole (305), the connecting air hole (305) extends along the rotation direction of the forming mold (3), the connecting air hole (305) is connected to the cleaning air hole, and the cleaning air hole is connected to the active air hole (601) through the connecting air hole (305).

7. A double-pressing rotary tablet press according to claim 6, characterized in that: The double-pressing rotary tablet press also includes a blocking ring (7), the blocking ring (7) is tightly matched with the forming mold (3), and the blocking ring (7) is covered on the connecting air hole (305).

8. A double-pressing rotary tablet press according to claim 7, characterized in that: The molding die (3) is provided with a ring body embedding groove (306), the ring body embedding groove (306) is connected to the connecting air hole (305), and the blocking ring (7) is embedded in the ring body embedding groove (306).

9. A double-pressing rotary tablet press according to claim 1, characterized in that: The cleaning air holes are provided in a plurality, and the plurality of cleaning air holes are divided into negative pressure air holes (303) and positive pressure air holes (304); The negative pressure air hole (303) is used to suck air into the molding slide cavity, and the positive pressure air hole (304) is used to blow air into the molding slide cavity. The negative pressure air hole (303) is located at the top of the positive pressure air hole (304).

10. A double-pressing rotary tablet press according to claim 9, characterized in that: The double-pressing rotary tablet press also includes a cleaning pneumatic part (6), wherein the cleaning pneumatic part (6) is provided with an active air hole (601) extending therethrough, and the active air hole (601) is used to generate negative pressure or positive pressure; The cleaning pneumatic parts (6) are provided with a plurality of them, and the plurality of cleaning pneumatic parts (6) are divided into negative pressure pneumatic parts and positive pressure pneumatic parts, the active air holes (601) of the negative pressure pneumatic parts are used to generate negative pressure, and the active air holes (601) of the positive pressure pneumatic parts are used to generate positive pressure; The molding slide cavity and the cleaning air holes are both provided with a plurality of them, and the plurality of the cleaning air holes are provided on the inner wall of each molding slide cavity. The plurality of the cleaning air holes are connected to the active air holes (601) of the positive pressure pneumatic part and the active air holes (601) of the negative pressure pneumatic part in sequence through the rotation of the molding mold (3).

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