CN216153128U

CN216153128U - Tabletting device for double-layer tablets

Info

Publication number: CN216153128U
Application number: CN202122184391.5U
Authority: CN
Inventors: 郭炳其; 丁红莉; 叶伟; 陈林; 方乐涛
Original assignee: Yong'an Kangjian Pharmaceutical Wuhan Co ltd
Current assignee: Yong'an Kangjian Pharmaceutical Wuhan Co ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2022-04-01
Anticipated expiration: 2031-09-10

Abstract

The utility model discloses a tabletting device for double-layer tablets, which belongs to the technical field of tablet tabletting machines and comprises a rotary tablet machine body, a first feeding hole and a second feeding hole, wherein the first feeding hole and the second feeding hole are used for sequentially conveying bottom layer powder and top layer powder for punching holes; the tablet outlet is arranged between the recovery shovel plate for recovering the powder on the top layer and the first feeding hole; an annular slide rail is arranged on the upper upright post and comprises two sinking sections which are respectively positioned between a recovery shovel plate for recovering bottom layer powder and the feed inlet II and between a recovery shovel plate for recovering top layer powder and the tablet outlet; the first feeding hole and the second feeding hole can provide two different kinds of powder, the double-layer tablet can be formed after twice stamping, and the bottom layer powder and the top layer powder falling on the middle rotary table can be shoveled by the recovery shovel plate, so that the color mixing problem is effectively avoided.

Description

Tabletting device for double-layer tablets

Technical Field

The utility model relates to the technical field of tablet pressing machines, in particular to a pressing device for double-layer tablets.

Background

Because the products of the double-layer tablets are rare in the market, no tabletting device specially for the double-layer tablets exists, usually, the double-feeding device is directly installed on the existing single-layer tabletting equipment, different powder materials are provided for punching holes through the double-feeding device, then the double-layer tablets are formed after twice punching, the single-layer tabletting equipment mostly adopts a rotary tablet machine, for example, a tablet machine for single-layer tabletting provided in the utility model with the patent number of 201720998059.3 and the name of 'a rotary tablet tabletting machine', the tablet machine comprises a main machine body and a tabletting mechanism arranged on the main machine body, wherein the tabletting mechanism comprises an upper fixed column and a lower fixed column, a rotating shaft is arranged between the upper fixed column and the lower fixed column, an upper rotary table, a middle rotary table and a lower rotary table are sequentially arranged on the rotating shaft, and the upper rotary table and the lower rotary table are respectively and annularly provided with an upper punch rod, Punching holes are annularly distributed on the middle rotary table, a hopper is arranged on one side of the main body, and a discharge hole of the hopper is communicated with the punching holes; the lower fixing column is provided with a fixing disc, rolling needles are annularly arranged on the fixing disc, a second pressing wheel is arranged on the side wall of the fixing disc, the second pressing wheel penetrates through the fixing disc to jack the lower punching rod, and the second pressing wheel and the first pressing wheel are perpendicular to each other. During tabletting, the rotating shaft drives the upper rotary table, the middle rotary table and the lower rotary table to synchronously rotate, the upper punch rod vertically moves along the track of the annular slide rail after feeding the punching holes one by one through the hopper in the rotating process of the middle rotary table, and when the lowest point of the annular slide rail is reached, the upper punch rod is pressed by the first pressing wheel, so that the upper punch rod and the lower punch rod are matched to perform tabletting, and the tabletting of single-layer tablets is completed. However, when the tablet press with the double feeding devices is used for tabletting, powder is inevitably remained on the middle rotary table during feeding, so that when top-layer powder is punched and formed tablets are discharged and slide on the middle rotary table, the double-layer tablets are easy to rub and cross color, the surface of the light color layer contains a deep color ingredient, the surface of the dark color layer contains a light color ingredient, and if the surface of the white layer has a red pigment, the product quality and the attractiveness are seriously affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems and provides a tabletting device for double-layer tablets, wherein a first feeding hole and a second feeding hole are arranged above a middle rotary table at intervals, so that two different powder materials are provided for a punching hole, tabletting and forming of the double-layer tablets can be realized after two times of punching are respectively carried out, meanwhile, a recovery shovel plate is arranged on the middle rotary table, and the bottom layer powder material and the top layer powder material of the first feeding hole and the second feeding hole which fall on the middle rotary table can be respectively shoveled and recovered through the recovery shovel plate, so that the problems of color mixing caused by mutual mixing of the bottom layer powder material and the top layer powder material and sticking of the formed tablets to the powder material are avoided.

In order to achieve the purpose, the utility model provides the following scheme: the utility model provides a tabletting device for double-layer tablets, which comprises a rotary tablet machine body, wherein the rotary tablet machine body comprises an upper stand column and a lower stand column, a rotating shaft is arranged between the upper stand column and the lower stand column, the rotating shaft is sequentially provided with an upper rotary table with an upper punch, a middle rotary table with a punching hole and a lower rotary table with a lower punch from top to bottom, the upper rotary table and the middle rotary table sequentially convey bottom layer powder and top layer powder to the punching hole, and the first feed inlet and the second feed inlet are arranged above the middle rotary table at intervals; the middle rotating disc is provided with a recovery shovel plate which respectively shovels and recovers the bottom layer powder and the top layer powder on the upper surface of the middle rotating disc, the shovel powder end of the recovery shovel plate is attached to the upper surface of the middle rotating disc, and the discharge end of the recovery shovel plate is connected with a recovery device; the tablet outlet is arranged between the recovery shovel plate for recovering the powder on the top layer and the first feeding hole; and the upper upright post is provided with an annular slide rail used for guiding the upper punch to lift, the annular slide rail comprises two sinking sections used for stamping by the upper punch, and the two sinking sections are respectively positioned between the recovery shovel plate for recovering the bottom powder and the feed inlet II and between the recovery shovel plate for recovering the top powder and the tablet outlet.

Preferably, the first feeding hole and the second feeding hole are symmetrically arranged on two sides of the rotating shaft.

Preferably, the first feed port and the second feed port are respectively adjacent to the powder shoveling ends of the recovery shoveling plates, and the distance between the first feed port and the second feed port and the circumferential distance between the two adjacent punching holes is smaller than or equal to the circumferential distance between the two adjacent punching holes.

Preferably, one side of the powder shoveling end of the recovery shovel plate, which is attached to the rotating shaft, inclines towards the rotating direction of the middle rotating disc, and the recovery shovel plate is provided with an arc-shaped guide edge for guiding the powder to move towards the recovery device.

Preferably, the recovery device is a recovery box arranged below the discharge end of the recovery shovel plate.

Preferably, the tablet outlet is provided with a collecting channel sloping downwards.

Preferably, the bottom of the collecting guide groove is provided with a finished product collecting barrel.

Preferably, a sealing frame is included, within which the rotary tablet press body is disposed.

Preferably, the sealing frame is provided with a cooling port communicated with the refrigerating device.

Preferably, the sealing frame is provided with a first hopper and a second hopper which are respectively connected with the first feeding hole and the second feeding hole.

Compared with the prior art, the utility model has the following technical effects:

1. in the double-layer tablet tabletting device, two feeding holes which are arranged at intervals are arranged above the middle rotary table, namely a first feeding hole for conveying bottom powder and a second feeding hole for conveying top powder for the punching hole, so that two kinds of powder can be provided for the pressing of the double-layer tablet, and then a recovery shovel plate is arranged close to the first feeding hole and the second feeding hole, so that the powder on the upper surface of the middle rotary table can be scraped and recovered in time after the first feeding hole and the second feeding hole are fed, the color mixing problem caused by the mixing of the bottom powder and the top powder on the upper surface of the middle rotary table after the bottom powder is conveyed is avoided, and the color mixing problem caused by the contact of the bottom powder of the double-layer tablet and the top powder on the middle rotary table when the tablet is ejected out of the punching hole and slides on the middle rotary table after the tablet is formed, so that the quality and the attractiveness of the double-layer tablet are ensured; meanwhile, the annular slide rail on the upper upright column comprises two sinking sections, and the two sinking sections are respectively positioned between the recovery shovel plate for recovering the bottom powder and the feed inlet II and between the recovery shovel plate for recovering the top powder and the tablet outlet, so that the step of twice punching is realized, the bottom powder is pressed into tablets, and the top powder and the bottom powder are pressed together with the medicament which is already flaky, so that the punching of double-layer tablets is realized.

2. The distance between the first feeding hole and the second feeding hole and the powder shoveling end of the adjacent recycling shoveling plate is smaller than or equal to the circumferential distance between the two adjacent punching holes, so that on one hand, the powder scattered on the middle rotary table can be timely scraped to avoid color mixing, on the other hand, the powder amount in each punching hole can be the same, and the problem that the powder amount in the punching hole is more than that in the previous punching hole after the powder on the middle rotary table falls into the next punching hole, so that the thickness of the final tablet finished product is different is solved.

3. According to the utility model, the powder shoveling end of the recovery shovel plate is inclined to the rotation direction of the middle rotating disc along one side of the rotating shaft, so that powder on the middle rotating disc can be guided to move inwards, and then slides to the recovery device along the arc-shaped guide edge on the recovery shovel plate, thereby improving the recovery efficiency, and meanwhile, the arc-shaped guide edge can also prevent the powder from falling onto the middle rotating disc again.

4. According to the rotary tablet press, the rotary tablet press body is arranged in the sealing frame, so that the quality problem of tablets caused by the fact that external dust enters the punching hole can be prevented, and the powder dust can be prevented from polluting the outside.

5. According to the utility model, the cooling port communicated with the refrigerating device is arranged on the sealing frame, and cold air can be supplied into the sealing frame through the refrigerating device, because the upper punch and the lower punch can generate higher heat due to high-strength stamping in the process of stamping the tablet, powder is melted and then adhered to the punches, and the subsequent stamping effect is influenced, so that the temperature of the upper punch and the lower punch can be reduced by supplying the cold air through the refrigerating device, and the problem of powder melting and adhering is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a top view of a spin chuck;

FIG. 2 is a schematic diagram of the double-layered tablet tabletting apparatus at point A of FIG. 1;

FIG. 3 is a schematic diagram of the double-layered tablet tabletting apparatus shown in FIG. 1 at point B;

fig. 4 is a schematic structural view of a tabletting apparatus for the bilayer tablet at point C of fig. 1.

Description of reference numerals: 1. an upper upright post; 2. a lower upright post; 3. a rotating shaft; 4. rotating the turntable upwards; 5. a middle rotary table; 6. a downward rotation turntable; 7. an upper punch; 8. a lower punch; 9. punching a hole; 10. a first feeding hole; 11. A second feeding hole; 12. recovering the first shovel plate; 13. recovering the second shovel plate; 14. an annular slide rail; 15. sinking to a first section; 16. a sinking section II; 17. a tablet outlet; 18. a recycling bin; 19. a collection channel; 20. a sealing frame; 21. a cold supply pipe; 22. a first hopper; 23. a second hopper; 24. an upper pinch roller; 25. a lower pinch roller; 26. a main body frame; 27. a base; 28. and fixing the tray.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment provides a tabletting device for double-layer tablets, as shown in fig. 1 to 4, comprising a rotary tablet press body, wherein the rotary tablet press body comprises a base 27, a main frame 26, an upper column 1 and a lower column 2, the main frame 26 is fixed on the base 27, and the lower column 2 is arranged inside the main frame 26 and is also fixedly connected on the base 27. Go up stand 1 fixed connection and be equipped with pivot 3 between stand 1 and the lower stand 2 at the top of main part frame 26, from the top down fixedly connected with top spin dish 4, well carousel 5, lower carousel 6 in proper order on pivot 3, top spin dish 4, well carousel 5, lower carousel 6 and the coaxial setting of pivot 3. A plurality of upper punches 7 are annularly arranged on the upper rotary table 4, a plurality of punching holes 9 are annularly arranged on the middle rotary table 5, a plurality of lower punches 8 are annularly arranged on the lower rotary table 6, and the upper punches 7, the lower punches 8 and the punching holes 9 correspond to one another one by one so that the upper punches 7 and the lower punches 8 can extend into the punching holes 9. Two feed inlets are arranged above the middle rotary table 5, namely a first feed inlet 10 for providing bottom layer powder and a second feed inlet 11 for providing top layer powder for the punching hole 9, and the first feed inlet 10 and the second feed inlet 11 are arranged above the middle rotary table 5 at intervals and are close to the upper surface of the middle rotary table 5. Still be equipped with the bottom powder of respectively 5 upper surfaces of well carousel of whirling on the carousel 5, the recovery shovel board of top layer powder shovel and recovery, retrieve shovel board one 12 promptly, retrieve shovel board two 13, the shovel powder end laminating of retrieving the shovel board is at the upper surface of well carousel 5, its shovel powder end extends to inboard side always from the outside limit of middle carousel 5, and the outer wall of the inboard side laminating pivot 3 of shovel powder end, so that 5 surfaces of whole well carousel all can be scraped the place that can not appear omitting, the discharge end and the recovery unit of retrieving the shovel board are connected. Referring to fig. 1, along the rotation direction of the middle rotating disc 5, a first feed inlet 10, a first recovery shovel plate 12, a second feed inlet 11 and a second recovery shovel plate 13 are sequentially arranged, the first recovery shovel plate 12 can timely shovel and convey bottom powder on the upper surface of the middle rotating disc 5 into a recovery device after the first feed inlet 10 feeds the punching holes 9 so as to avoid mixing into top powder conveyed by the second feed inlet 11 and cause a color cross problem, and the second recovery shovel plate 13 timely shovel and convey top powder on the upper surface of the middle rotating disc 5 into the recovery device after the second feed inlet 11 feeds the punching holes 9 so as to avoid the top powder from being stained on the bottom surface of the double-layer tablet when the formed tablet is pushed out of the punching holes 9 by the lower punch 8 and slides on the middle rotating disc 5 and cause color cross. The tablet outlet 17 is arranged on the main body frame 26 between the second recovery shovel plate 13 and the first feeding hole 10, so that the formed double-layer tablets can be thrown out of the tablet outlet 17 under the centrifugal action of the middle rotating disc 5. The upper upright post 1 is provided with an annular slide rail 14 for guiding the upper punch 7 to ascend and descend, the upper punch 7 is connected to the upper spinning disc 4 in a sliding manner, the head of the upper punch 7 is provided with an expanded end, the expanded end is hung on the annular slide rail 14, and the upper punch 7 can slide along the annular slide rail 14 along with the rotation of the upper spinning disc 4. The annular slide rail 14 is provided with two sinking sections, namely a sinking section I15 and a sinking section II 16, the annular slide rail 14 is similar to a V shape in the sinking section and is provided with two reverse landslides, the lowest point of the sinking section is close to the upper rotating disc 4, when the upper punch 7 slides to the sinking section, the annular slide rail firstly moves downwards along the landslide and extends into the punching hole 9, the annular slide rail is matched with the lower punch 8 at the position to punch powder, in order to have enough punching force in punching, the sinking section is provided with an upper pressing wheel 24, when the upper punch 7 slides to the lowest point of the sinking section, the top end of the upper punch 7 can abut against the lowest point of the upper pressing wheel 24, the upper pressing wheel 24 can ensure that the upper punch 7 has enough punching strength, and then along with the rotation of the upper rotating disc 4, the upper punch 7 can slide out the sinking section along the other landslide. The first sinking section 15 is positioned between the first recovery shovel plate 12 and the second feeding hole 11, and the second sinking section 16 is positioned between the second recovery shovel plate 13 and the tablet outlet 17. The lower upright post 2 below the lower rotary table 6 is fixedly connected with a fixed tray 28, the bottom end of the lower punch 8 is abutted against the upper surface of the fixed tray 28 to support the upper punch 7, the lower upright post 2 is also provided with a lower pressing wheel 25, the lower pressing wheel 25 is positioned between the first sinking section 15 and the tablet outlet 17, the lower pressing wheel 25 penetrates through the fixed tray 28, the lower punch 8 above the lower pressing wheel 25 is jacked up by the lower pressing wheel 25, and the end head of the lower punch 8 on the top point of the lower pressing wheel 25 is flush with the end surface of the punching hole 9 so as to lift out the formed double-layer tablet in advance, so that the double-layer tablet rotates along with the surface of the middle rotary table 5 and is thrown out of the tablet outlet 17 under the centrifugal action.

The specific forming principle of the double-layer tablet is as follows:

the device is started, a motor (not shown in the figure) in the device is started, the rotating shaft 3 starts to rotate under the action of the motor, and the upper rotating disc 4, the middle rotating disc 5 and the lower rotating disc 6 rotate synchronously along with the rotating shaft 3.

And (3) blanking bottom powder, wherein the bottom powder is conveyed into the punching holes 9 from the first feeding holes 10, and the first feeding holes 10 uniformly fill the punching holes 9 one by one along with the rotation of the middle rotating disc 5. And along with the rotation of well carousel 5, the bottom powder that spills on well carousel 5 upper surface can be shoveled by the shovel powder end of retrieving shovel board 12 to carry to recovery unit in from the discharge end along retrieving the face of shovel board 12, retrieve the bottom powder, reserve and use afterwards, the back is shoveled to the bottom powder on well carousel 5 surface simultaneously, can avoid mixing the problem of cross color with the top layer powder.

For the first tabletting, as the rotating shaft 3 rotates, the upper punch 7 in the upper rotating disc 4 slides to the first 15 of the sinking section of the annular slide rail 14 and slides down to the lowest point of the first 15 of the sinking section along a landslide, and when the lowest point is reached, the lower punch 8 is pressed by the upper pressing wheel 24 and matched with the lower punch 7 in the punching hole 9 to tablet the powder at the bottom layer. As the middle rotary table 5 continues to rotate, the upper punch 7 moves up along the other landslide of the first sinking segment 15 and slides back to the non-sinking segment of the annular slide rail 14, and the upper punch 7 gradually separates from the punching hole 9.

And (3) blanking top layer powder, rotating the rotating shaft 3 continuously, rotating the punched hole 9 subjected to first tabletting to the position below a second feeding hole 11, conveying the top layer powder for the punched hole 9 by the second feeding hole 11, conveying the top layer powder for the punched hole 9 rotated from the rear one by one, and shoveling the scattered top layer powder on the upper surface of the middle rotating disc 5 under the action of a second recycling shovel plate 13 to convey the top layer powder to a recycling device.

And (3) performing secondary tabletting, namely, continuously rotating along with the rotating shaft 3, pouring the punching hole 9 of the top powder and the corresponding upper punch 7 to the second sinking section 16, and performing secondary tabletting on the tablets under the combined action of the upper punch 7, the upper pressing wheel 24 at the second sinking section 16 and the lower punch 8 to complete the tabletting of the double-layer tablets.

And (3) sheet discharging, wherein the lower punch 8 in the lower rotary table 6 rotates to the lower pressing wheel 25 along with the rotation of the rotating shaft 3, and gradually moves upwards along with the lower pressing wheel 25, when the top of the lower pressing wheel 25 is reached, the top end of the lower punch 8 is flush with the top surface of the punching hole 9, the formed double-layer tablets are ejected out of the punching hole 9 and rotate along with the middle rotary table 5, the double-layer tablets are thrown to the edge of the middle rotary table 5 under the centrifugal action, and when the double-layer tablets meet the tablet outlet 17, the double-layer tablets are thrown out of the tablet outlet 17, and sheet discharging is completed.

In this embodiment, referring to fig. 1, the first feeding hole 10 and the second feeding hole 11 are symmetrically disposed on two sides of the middle rotating disc 5, so that the first feeding hole 10 and the second feeding hole 11 have a sufficient distance to ensure that two times of material filling and two times of punching are performed.

In this embodiment, referring to fig. 1, the distance between the first feeding hole 10 and the first recycling shovel 12 and the distance between the second feeding hole 11 and the second recycling shovel 13 are smaller than or equal to the circumferential distance between the two adjacent stamping holes 9, so that the recycling shovel can timely shovel the powder and recycle the powder.

In this embodiment, referring to fig. 1, the side of the first recycling shovel 12 and the side of the second recycling shovel 13 where the powder end is attached to the rotating shaft 3 are inclined toward the rotating direction of the first recycling shovel 5, so that the powder on the upper surface of the first recycling shovel 5 can be guided to slide toward the inner sides of the first recycling shovel 12 and the second recycling shovel 13, and meanwhile, the first recycling shovel 12 and the second recycling shovel 13 are both provided with arc-shaped guide edges, and the shoveled powder can slide into the recycling device along the arc-shaped guide edges, and meanwhile, the arc-shaped guide edges can block the first recycling shovel 12 and the leaked powder on the second recycling shovel 13 from sliding toward the rotating direction of the first recycling shovel 5, and then fall onto the surface of the second recycling shovel 5 again.

In this embodiment, referring to fig. 2 to 4, the recycling device is a recycling bin 18, and the recycling bin 18 is disposed below the discharge ends of the recycling shovel plate i 12 and the recycling shovel plate ii 13, and is used for recycling powder.

In this embodiment, referring to fig. 2 to 4, a collecting guide groove 19 is disposed at the tablet outlet 17, the collecting guide groove 19 is inclined downward, a collecting device is disposed at the end of the collecting guide groove 19, and the molded double-layered tablet is discharged from the tablet outlet 17, slides downward along the collecting guide groove 19, and can slide into the collecting device.

Further, in this embodiment, a finished product collecting barrel is disposed at the bottom of the collecting guide groove 19 as a collecting device, and the formed double-layer tablet slides into the finished product collecting barrel along the collecting guide groove 19 for collection.

In this embodiment, referring to fig. 2 to 4, a sealing frame 20 is further disposed outside the rotary tablet press body, the rotary tablet press body is disposed in the sealing frame 20, and the sealing frame 20 can prevent external dust from entering the rotary tablet press body to affect the quality of the tablet, and prevent the internal dust from polluting the external air. The periphery of the sealing frame 20 can be made of transparent glass, so that the specific pressing conditions inside the sealing frame can be conveniently observed. The sealing frame 20 is provided with an openable door to repair or replace the internal components.

Because the upper punch 7 of tablet press, lower punch 8 can produce higher heat when carrying out the punching press of high strength, and high heat leads to the material composition to melt very easily and glues at the punch, influence tablet preforming quality consequently, in order to reduce the temperature of upper punch 7, lower punch 8, in this embodiment, be equipped with the cooling mouth with refrigerating plant intercommunication in one side of sealing frame 20, the last cooling pipe 21 of refrigerating plant accessible cooling mouth stretches into sealing frame 20, when carrying out the preforming, supply cold air to sealing frame 20 inside through refrigerating plant, thereby reduce the temperature of upper punch 7, lower punch 8, avoid the problem appearance of material composition melting sticking.

In this embodiment, referring to fig. 2 to 4, two hoppers are erected on the sealing frame 20, which are a first hopper 22 connected to the first feeding hole 10 and a second hopper 23 connected to the second feeding hole 11, when in use, the bottom powder is firstly added to the first hopper 22, the bottom powder slides to the first feeding hole 10 along the first hopper 22 under the action of gravity, and enters the punching hole 9 from the first feeding hole 10, then the top powder is added to the second hopper 23, and the top powder is sent to the punching hole 9 after the first punching from the second feeding hole 11 under the action of gravity.

The principle and the implementation mode of the utility model are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.

Claims

1. A tabletting device for double-layer tablets comprises a rotary tablet press body, wherein the rotary tablet press body comprises an upper stand column and a lower stand column, a rotating shaft is arranged between the upper stand column and the lower stand column, and the rotating shaft is sequentially provided with an upper rotary table with an upper punch, a middle rotary table with a punching hole and a lower rotary table with a lower punch from top to bottom; the middle rotating disc is provided with a recovery shovel plate which respectively shovels and recovers the bottom layer powder and the top layer powder on the upper surface of the middle rotating disc, the shovel powder end of the recovery shovel plate is attached to the upper surface of the middle rotating disc, and the discharge end of the recovery shovel plate is connected with a recovery device; the tablet outlet is arranged between the recovery shovel plate for recovering the powder on the top layer and the first feeding hole; and the upper upright post is provided with an annular slide rail used for guiding the upper punch to lift, the annular slide rail comprises two sinking sections used for stamping by the upper punch, and the two sinking sections are respectively positioned between the recovery shovel plate for recovering the bottom powder and the feed inlet II and between the recovery shovel plate for recovering the top powder and the tablet outlet.

2. The bilayer tablet compression device of claim 1, wherein the first feed port and the second feed port are symmetrically disposed on opposite sides of the rotating shaft.

3. A tabletting apparatus for bilayer tablets as claimed in claim 2, wherein the first and second inlets are spaced from the powder-scooping end of the adjacent recovery scoop plate by a distance less than or equal to the circumferential distance between two adjacent punch holes.

4. A tabletting apparatus for bilayer tablet as claimed in claim 1, wherein a side of the powder-scooping end of the recovery scoop plate facing the rotation shaft is inclined to the rotation direction of the middle rotation disc, and the recovery scoop plate is provided with an arc-shaped guiding edge for guiding the powder to move toward the recovery device.

5. A tabletting apparatus for bilayer tablets as claimed in claim 4, wherein said recovery means is a recovery box disposed below the discharge end of said recovery blade.

6. A tabletting apparatus for bilayer tablets as claimed in claim 1, wherein said tablet outlet is provided with a downwardly inclined collection channel.

7. A tabletting apparatus for bilayer tablets as claimed in claim 6, wherein the bottom of said collecting channel is provided with a product collecting barrel.

8. A bilayer tablet tableting device as claimed in claim 1, comprising a sealing frame within which the rotary tablet press body is disposed.

9. A device for tabletting double-layered tablets as claimed in claim 8, wherein said sealing frame is provided with a cooling port communicating with a cooling device.

10. A tabletting apparatus for bilayer tablets as claimed in claim 9, wherein said sealing frame is provided with a first hopper and a second hopper connected to said first inlet and said second inlet respectively.