Dry powder roller compactor

Abstract

This invention belongs to the field of dry granulation technology and discloses a dry powder roller press granulator, including a first material extrusion system, a second material extrusion system, and a roller pressing mechanism. The discharge port of the first material extrusion system is connected to the inlet of the second material extrusion system, and the discharge port of the second material extrusion system is connected to the roller pressing mechanism. A first exhaust device is connected to the extrusion end of the first material extrusion system, and a second exhaust device is connected to the extrusion end of the second material extrusion system. The first material extrusion system is located above the second material extrusion system, and a transition pipe is provided between the first and second material extrusion systems. First, primary exhaust is performed through the first exhaust device, and the transition pipe serves as an intermediate transition zone to compress and buffer the material, allowing a large amount of air to be expelled before the material enters the second material extrusion system. Then, secondary exhaust is performed through the second exhaust device to further compress and compact the material.

Description

Technical Field

[0001] This invention relates to dry granulation technology, specifically to a dry powder roller press granulator. Background Technology

[0002] Dry powder roller press granulators are widely used in pharmaceutical, chemical, food, and new energy materials industries. Their basic principle is to apply high pressure to the material using a pair of relatively rotating rollers, extruding it into thin sheets or cakes, which are then crushed and granulated to obtain particles of the desired size. Compared to traditional wet granulation, dry granulation requires no binders or solvents and offers advantages such as simple process, low energy consumption, no pollution, and good product stability.

[0003] However, in actual production, dry powder roller press granulators generally face a technical challenge: the material to be processed is usually in powder form, with numerous voids between ultrafine particles, and a large amount of air adsorbed and trapped on and inside the powder surface, resulting in a loose material with low bulk density. When such high-air-content powder enters the wedge-shaped roller pressing zone between two rollers through the feeding system, the gas is difficult to effectively expel in a short time, preventing the material from being fully compacted, resulting in insufficient density of the material entering the roller pressing zone. The direct consequences include: 1. Difficulty in tableting; the extruded tablets have low strength, are easy to break, or are powdery, which affects granulation. 2. The granules are of poor quality, and the product contains residual gas, which causes pores and bubbles to appear inside the product; 3. It is prone to "air blockage", which leads to unstable equipment operation and affects the pellet yield.

[0004] In existing technologies, some granulators attempt to remove gas by installing a stirring device or a vacuum degassing device in the feeding hopper. However, these methods often suffer from low degassing efficiency, complex structure, and poor adaptability to materials with poor flowability. Therefore, effectively removing the gas entrained in the material before it enters the roller pressing zone and compressing the material into a dense state is a key technical problem that urgently needs to be solved in the field of dry powder roller pressing granulation technology. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a dry powder roller press granulator to solve the technical problem in the prior art that the powdered material has a large air content and is loose and difficult to compact, which makes it difficult to effectively press the material into tablets or granules.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a dry powder roller press granulator, comprising a first material extrusion system, a second material extrusion system and a roller press mechanism, wherein the discharge port of the first material extrusion system is connected to the inlet of the second material extrusion system, the discharge port of the second material extrusion system is connected to the roller press mechanism, the extrusion end of the first material extrusion system is connected to a first exhaust device, and the extrusion end of the second material extrusion system is connected to a second exhaust device. The first material extrusion system is located above the second material extrusion system, and a transition pipe for extruding and buffering the material is provided between the outlet of the first material extrusion system and the inlet of the second material extrusion system.

[0007] Compared with the prior art, the present invention has the following beneficial effects: the first exhaust device performs primary exhaust on the first material extrusion system, and a transition pipe is connected between the first material extrusion system and the second material extrusion system. The material pre-compressed by the first material extrusion system enters the second material extrusion system through the transition pipe. The cavity of the transition pipe serves as an intermediate transition zone for temporary material buffering, which is used to compress and buffer the material, so that a large amount of air is discharged before the material enters the second material extrusion system, greatly increasing the density of the material. Then, the second exhaust device performs secondary exhaust on the second material extrusion system, achieving further compression and compaction of the material.

[0008] Preferably, the feed end of the second material extrusion system is provided with a third exhaust device, which is located on the side of the feed end.

[0009] Preferably, the third exhaust device is an air filter plate.

[0010] Preferably, the first material extrusion system includes two first extrusion screws arranged in parallel, the two first extrusion screws being interlocked and rotating in the same direction.

[0011] Preferably, the second material extrusion system includes four parallel second extrusion screws, with adjacent second extrusion screws interlocked and rotating in the same direction.

[0012] Preferably, the diameter of the second extrusion screw is smaller than the diameter of the first extrusion screw.

[0013] Preferably, the transition pipe includes an inclined sliding section and a vertical falling section, the inclined sliding section being connected to a first material extrusion system and the vertical falling section being connected to a second material extrusion system.

[0014] Preferably, the discharge port of the first material extrusion system is connected to the inlet of the transition pipe, the discharge port of the transition pipe is connected to the inlet of the second material extrusion system, and the cross-sectional area of ​​the inlet of the transition pipe is smaller than the cross-sectional area of ​​the discharge port of the transition pipe.

[0015] Preferably, the cross-sectional area of ​​the transition pipe gradually increases from the inlet to the outlet.

[0016] Preferably, the transition pipe includes a first pipe and a second pipe, the first pipe being connected to a first material extrusion system and the second pipe being connected to a second material extrusion system; The inlet of the first pipe is connected to the outlet of the first material extrusion system, the outlet of the first pipe is connected to the inlet of the second pipe, and the outlet of the second pipe is connected to the inlet of the second material extrusion system.

[0017] Preferably, the cross-sectional area of ​​the first pipe gradually increases from the inlet to the outlet, and the cross-sectional area of ​​the second pipe is equal from the inlet to the outlet.

[0018] Preferably, the first material extrusion system is arranged in a horizontal or inclined direction.

[0019] Preferably, the first exhaust device includes a first exhaust filter element and a first vacuum device connected to the first exhaust filter element, and the second exhaust device includes a second exhaust filter element and a second vacuum device connected to the second exhaust filter element. The extrusion end of the first material extrusion system is provided with a first socket for installing a first exhaust filter element, and the extrusion end of the second material extrusion system is provided with a second socket for installing a second exhaust filter element.

[0020] Preferably, both the first exhaust filter element and the second exhaust filter element include a housing with a cavity, a sintered filter plate located at the bottom of the housing, and a cover plate located at the top of the housing, wherein the cover plate is provided with a connection port for connecting to a vacuum pumping device.

[0021] Preferably, the sintered filter plate is arc-shaped, and its curvature matches the shape of the spiral blades of the extrusion screw.

[0022] To make the above features and effects of the present invention readily apparent, the following detailed description, in conjunction with the accompanying drawings, will provide a clear and complete account. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the dry powder roller press granulator of the present invention; Figure 2This is a schematic diagram of the assembly of the first material extrusion system and the second material extrusion system in this invention. Figure 1 ; Figure 3 yes Figure 2 The main view diagram shows the first and second extrusion screws inside; Figure 4 This is a schematic diagram of the structure of the first material extrusion system in this invention; Figure 5 This is a schematic diagram of the installation of the first exhaust filter element in this invention; Figure 6 This is a schematic diagram of the structure of the second material extrusion system in this invention; Figure 7 This is a schematic diagram of the installation of the second exhaust filter element in this invention; Figure 8 This is a schematic diagram of the structure of the first exhaust filter element in this invention; Figure 9 This is a schematic diagram of the structure of the second exhaust filter element in this invention; Figure 10 This is a schematic diagram of the assembly of the first material extrusion system and the second material extrusion system in this invention. Figure 2 ; Figure 11 This is a schematic diagram of the assembly of the first material extrusion system and the second material extrusion system in this invention. Figure 3 ; Figure 12 This is a schematic diagram of the assembly of the first material extrusion system and the second material extrusion system in this invention. Figure 4 .

[0024] In the figure: 1-First material extrusion system, 11-First drive mechanism, 12-First material feeding mechanism, 13-First output shaft, 14-First extrusion screw, 15-First feed chamber, 16-First conveying chamber, 17-First exhaust filter element, 2-Second material extrusion system, 21-Second drive mechanism, 22-Second material feeding mechanism, 23-Wedge push assembly, 24-Second output shaft, 25-Second extrusion screw, 26-Second feed chamber, 27-Second conveying chamber, 28-Second exhaust filter element, 281-Box body, 282-Sintered filter plate, 283-Cover plate, 29-Air filter plate, 3-Roller pressing mechanism, 4-Transition pipe, 41-First pipe, 42-Second pipe. Detailed Implementation

[0025] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but this is not intended to limit the scope of protection of the present invention. The terms "front," "rear," "left," "right," "upper," and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the corresponding drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. The terms "first," "second," and "third" are only used to simplify the textual description and distinguish it from similar objects, and should not be construed as a specific sequential relationship. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "fixing," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the corresponding meanings of the above terms in this invention according to the specific circumstances.

[0027] The dry powder roller press granulator of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] See Figure 1 , Figure 1 The diagram illustrates the main structure of a dry powder roller press granulator according to this embodiment. The dry powder roller press granulator includes a base, a first material extrusion system 1, a second material extrusion system 2, and a roller pressing mechanism 3 mounted on the base. The base is constructed of welded steel. The operating height of the first material extrusion system 1 is higher than that of the second material extrusion system 2, and the second material extrusion system 2 and the roller pressing mechanism 3 are located at the same operating height.

[0029] See Figure 2 and Figure 3The first material extrusion system 1 includes a first drive mechanism 11 and a first material feeding mechanism 12 connected to the first drive mechanism 11. The second material extrusion system 2 includes a second drive mechanism 21 and a second material feeding mechanism 22 connected to the second drive mechanism 21. The first drive mechanism 11 and the second drive mechanism 21 include a drive motor and a transmission box. The drive motor and the transmission box and their connection relationship are conventional technologies in the mechanical field and will not be described in detail here. Specifically, the transmission box connected to the first material feeding mechanism 12 has two parallel first output shafts 13, and the transmission box connected to the second material feeding mechanism 22 has four parallel second output shafts 24. The transmission design of the transmission box ensures that the two parallel first output shafts 13 rotate in the same direction, and the four parallel second output shafts 24 rotate in the same direction. The rotation direction of the first output shaft 13 can be the same as or opposite to the rotation direction of the second output shaft 24.

[0030] See Figures 3 to 5 The first material feeding mechanism 12 includes a first barrel and two first extrusion screws 14 disposed inside the first barrel. The first barrel is hollow and has a first feeding chamber 15 and a first conveying chamber 16. The first feeding chamber 15 is a rectangular box, and the first conveying chamber 16 is a cylindrical body. The cross-sectional area of ​​the first feeding chamber 15 is larger than that of the first conveying chamber 16. The first feeding chamber 15 has an upward-facing opening, at which a feeding hopper (not shown in the figure) is provided. The opening is preferably rectangular, and the bottom opening of the feeding hopper is adapted to the shape of the opening. The location of the first feeding chamber 15 serves as the feeding end of the first material extrusion system 1. The material (powdered ultrafine powder) enters the interior of the first material extrusion system 1 from top to bottom through the feeding hopper. The first conveying chamber 16 has a discharge port corresponding to the extrusion direction of the screws, and the area of ​​the discharge port is the same as the cross-sectional area of ​​the first conveying chamber 16. The outlet of the first conveying chamber 16 is located at the extrusion end of the first material extrusion system 1. Through this outlet, the material after primary pre-compression can be forcibly fed into the second material extrusion system 2.

[0031] Two first extrusion screws 14 are arranged side by side and pass through the first feed chamber 15 and the first conveying chamber 16. One end of the first extrusion screw 14 is connected to the first output shaft 13, and the other end of the first extrusion screw 14 is located at the discharge port of the first conveying chamber 16. The first feed chamber 15 is provided with an end cap on one side of the first output shaft 13, and the first extrusion screw 14 passes through the end cap and is connected to the first output shaft 13. The first extrusion screw 14 is driven by the first output shaft 13 and rotates around the axis of the corresponding first output shaft 13. The two first extrusion screws 14 are respectively connected to the two first output shafts 13, and their rotation directions are the same. The two first extrusion screws 14 rotating in the same direction can prevent material from clogging between the two first extrusion screws 14. The spiral blades of the two first extrusion screws 14 are interlocked and do not interfere with each other. That is, any one spiral blade of one screw is located between the two spiral blades of the other screw, so as to reduce the material feeding opening and improve the material compaction efficiency. The pitch of the two adjacent spiral blades of the first extrusion screw 14 is equal. During the material conveying process through the first material extrusion system 1, the material at the extrusion end will form resistance to the material at the feed end. Combined with the thrust of the screw rotating forward, the air trapped in the material can be squeezed out and discharged from the exhaust device to compress the material.

[0032] The first conveying chamber 16 has an upward-facing first inlet located at the extrusion end of the first material extrusion system 1. A first exhaust device is connected to the first inlet, allowing air inside the first material extrusion system 1 to be discharged to the outside. The first exhaust device includes a first exhaust filter element 17 and a first vacuum device (not shown in the figure) connected to the first exhaust filter element 17. The insertion end of the first exhaust filter element 17 matches the first inlet. The first vacuum device is a Roots blower, which uses negative pressure to draw air out of the first exhaust filter element 17. Of course, for operating scenarios with low exhaust requirements, the first exhaust filter element 17 may not be connected to the first vacuum device, in which case natural exhaust occurs only through the first exhaust filter element 17. Since the exhaust filter element is a consumable part, its pores will become clogged after prolonged use, affecting exhaust performance. Therefore, it needs to be replaced promptly. The first inlet facilitates the replacement and assembly of the first exhaust filter element 17, simplifying operation and increasing replacement speed.

[0033] See Figure 3 , Figure 6 and Figure 7In this embodiment, the second material feeding mechanism 22 includes a second barrel and four second extrusion screws 25 disposed inside the second barrel. The second barrel is hollow and has a second feeding chamber 26 and a second conveying chamber 27. The second feeding chamber 26 is a rectangular box, and the second conveying chamber 27 is a cylinder. The cross-sectional area of ​​the second feeding chamber 26 is larger than that of the second conveying chamber 27. The second feeding chamber 26 has an upward-facing opening, which serves as the feed inlet of the second material extrusion system 2 to receive the material fed by the first material extrusion system 1. To ensure that the material entering the second material extrusion system 2 is further compressed and compacted before entering, a transition pipe 4 is connected between the outlet of the first material extrusion system 1 and the feed inlet of the second material extrusion system 2. The cavity of the transition pipe 4 serves as an intermediate transition zone for compressing and buffering the material, allowing it to be further compressed and compacted within this zone. It should be noted that because the transition pipe 4 is connected to the first material extrusion system 1, air inside the transition pipe 4 can be discharged to the outside through a first exhaust device.

[0034] The opening of the second feeding chamber 26 is preferably rectangular, and the outlet of the transition pipe 4 is adapted to the shape of this opening. The location of the second feeding chamber 26 serves as the feeding end of the second material extrusion system 2. The material that has undergone primary pre-compression is extruded from top to bottom into the interior of the second material extrusion system 2 through the transition pipe 4. The second conveying chamber 27 is provided with an outlet corresponding to the screw extrusion direction, and the area of ​​the outlet is the same as the cross-sectional area of ​​the second conveying chamber 27. The location of the outlet of the second conveying chamber 27 serves as the extrusion end of the second material extrusion system 2. Through this outlet, the material after two extrusions can be conveyed to the roller pressing mechanism 3. A wedge-shaped pushing assembly 23 is connected between the outlet of the second material extrusion system 2 and the roller pressing mechanism 3. The two pressure rollers of the roller pressing mechanism 3 are arranged vertically, and the wedge-shaped pushing assembly 23 is adapted between the two pressure rollers of the roller pressing mechanism 3.

[0035] Four second extrusion screws 25 are arranged side by side and pass through the second feed chamber 26 and the second conveying chamber 27. The four parallel second extrusion screws 25 generate greater extrusion force than the two parallel first extrusion screws 14. One end of each second extrusion screw 25 is connected to the second output shaft 24, and the other end is located at the outlet of the second conveying chamber 27. The second feed chamber 26 has an end cap on one side of the second output shaft 24, through which the second extrusion screw 25 passes and connects to the second output shaft 24. The second extrusion screws 25 are driven by the second output shaft 24 and rotate around the corresponding axis of the second output shaft 24. The four first extrusion screws 14 are respectively connected to the four second output shafts 24, and their rotation directions are the same. The four second extrusion screws 25 rotating in the same direction can prevent material from clogging between any two adjacent second extrusion screws 25. The spiral blades of two adjacent second extrusion screws 25 are interlocked and do not interfere with each other. That is, any one spiral blade of one of the two adjacent screws is located between the two spiral blades of the other screw, so as to reduce the feed opening of the material and improve the material compaction efficiency. The pitch of the two adjacent spiral blades of the second extrusion screws 25 is equal. During the material conveying process through the second material extrusion system 2, the material at the extrusion end will form resistance to the material at the feed end. Combined with the thrust of the screw rotating forward, the air trapped in the material can be further squeezed out and discharged from the exhaust device to further compress and compact the material.

[0036] It should be noted that in this embodiment, the width of the first material extrusion system 1 is equal to the width of the second material extrusion system 2. With equal widths, the first material extrusion system 1 is equipped with two first extrusion screws 14, while the second material extrusion system 2 is equipped with four second extrusion screws 25. The diameter of the second extrusion screws 25 is smaller than the diameter of the first extrusion screws 14, meaning the feeding port between any two adjacent second extrusion screws 25 is smaller than the feeding port between two first extrusion screws 14. When material is extruded into the second material extrusion system through the transition pipe 4... At time 2, because the feed opening between the two adjacent second extrusion screws 25 becomes smaller, it is not fast enough to convey the material to the discharge port of the second material extrusion system 2. As a result, the material is briefly buffered in the cavity of the transition pipe 4. Since there is no screw in the transition pipe 4, the material is more easily compressed and compacted in this intermediate transition zone. The air in the transition pipe 4 is discharged to the outside through the first exhaust device, so that a large amount of air is discharged before the material enters the second material extrusion system 2, which greatly increases the density of the material and allows it to flow smoothly into the second feed chamber 26 of the second material extrusion system 2.

[0037] Of course, in other embodiments, the first material extrusion system 1 may also be provided with other numbers of first extrusion screws 14, and the second material extrusion system 2 may be provided with other numbers of second extrusion screws 25 accordingly. As long as the feeding port between any two adjacent second extrusion screws 25 is smaller than the feeding port between two first extrusion screws 14, and the intermediate transition zone is combined, the above-mentioned technical effects can be achieved. Examples will not be given here.

[0038] See Figure 7 The second conveying chamber 27 is provided with an upward-facing second inlet located at the extrusion end of the second material extrusion system 2. A second exhaust device is connected to the second inlet, which can exhaust air from inside the second material extrusion system 2 to the outside. The second exhaust device includes a second exhaust filter element 28 and a second vacuum device (not shown in the figure) connected to the second exhaust filter element 28. The insertion end of the second exhaust filter element 28 matches the second inlet. The second vacuum device is a Roots blower, which uses negative pressure to draw air out of the second exhaust filter element 28. Of course, for operating scenarios with low exhaust requirements, the second exhaust filter element 28 may not be connected to the second vacuum device, and exhaust can be naturally discharged through the second exhaust filter element 28. Since the exhaust filter element is a consumable part, its filter pores will become clogged after long-term use, affecting exhaust performance. Therefore, it is necessary to replace the exhaust filter element in time. The second inlet facilitates the replacement and assembly of the second exhaust filter element 28, making operation convenient and improving the replacement speed.

[0039] See Figure 8 and Figure 9In this embodiment, both the first exhaust filter element 17 and the second exhaust filter element 28 include a housing 281 with a cavity, a sintered filter plate 282 located at the bottom of the housing, and a cover plate 283 located at the top of the housing. The sintered filter plate 282 is welded to the housing 281. The cover plate 283 is provided with a connection port for connecting to a vacuum equipment, and the periphery of the cover plate 283 is provided with mounting holes suitable for screw assembly, so that the cover plate 283 can be fixedly connected to the socket by screws. The sintered filter plate 282 is generally made of 304 or 316L sintered porous plate, with a pore size of about 1-5 micrometers (the specific pore size can be selected according to the fineness of the material). The sintered filter plate 282 can also be made of titanium or polymer materials. Different materials are selected according to different working conditions. Titanium sintered plates are used in applications with high corrosion resistance requirements; polymer sintered plates can be selected in applications where the material hardness is not high and the wear on the filter plate is not significant. The sintered filter plate 282 is arc-shaped, its curvature matching the shape of the spiral blades of the extrusion screw. Alternatively, the sintered filter plate 282 can be planar. If arc-shaped sintered filter plates 282 are chosen, their number corresponds to the number of extrusion screws; for example, two first extrusion screws 14 correspond to two consecutively arranged arc-shaped sintered filter plates 282, and four second extrusion screws 25 correspond to four consecutively arranged arc-shaped sintered filter plates 282. In daily production, the filtration area size of the sintered filter plate 282 can be selected according to the exhaust volume, ensuring that the sintered filter plate 282 can cover the entire screw extrusion area. The connection port is located in the middle area of ​​the cover plate 283, and the vacuum equipment is connected to this connection port via an air pipe. The cavity of the exhaust filter element can serve as a buffer chamber to accommodate air, facilitating uniform air extraction by the vacuum equipment.

[0040] See Figure 7In this embodiment, the feeding end of the second material extrusion system 2 is equipped with a third exhaust device, which is located in the second feeding chamber 26. The second material extrusion system 2 serves as a forced feeding stage and employs four second extrusion screws 25 to generate greater extrusion force. During the extrusion process, some of the gas discharged from the material rebounds back, and this third exhaust device can expel the air inside the second feeding chamber 26 to the outside. Since the transition pipe 4 is connected to the second feeding chamber 26, the third exhaust device can also expel the air inside the transition pipe 4 to the outside. In this embodiment, the third exhaust device is a filter plate 29 located on both sides of the rectangular box of the second feeding chamber 26. That is, the front and rear sides of the rectangular box have openings for installing the filter plate 29, and the two filter plates 29 are respectively located on the front and rear sides of the rectangular box. The filter plate 29 is fixedly installed on the front and rear sides of the rectangular box by screws, and its aperture is approximately 1-5 micrometers (the specific aperture can be selected according to the fineness of the material). The application of the air filter plate 29 is the same as that of the sintered filter plate 282 described above, and it is generally made of 304 or 316L sintered porous plate. Of course, the air filter plate 29 can also be connected to a vacuum pump to quickly extract air from the second feed chamber 26. In some operating scenarios, such as when the second exhaust filter element 28 is not connected to a vacuum pump, the air inside the second material extrusion system 2 can be naturally exhausted to the outside through the air filter plate 29 and the second exhaust filter element 28. It should be noted that when the second exhaust filter element 28 is connected to a vacuum pump, the air filter plate 29 must be in a sealed state, i.e., the air filter plate 29 must be closed.

[0041] See Figures 1 to 3 The transition pipe 4 is located between the first material extrusion system 1 and the second material extrusion system. The outlet of the first material extrusion system 1 is connected to the inlet of the transition pipe 4, and the outlet of the transition pipe 4 is connected to the inlet of the second material extrusion system 2. When the material flows into the inlet of the second material extrusion system 2, the cavity of the transition pipe 4 can be used as an intermediate transition zone to temporarily buffer the material. Furthermore, no screw is installed in the transition pipe 4, making it easier for the material to be further compressed and compacted in this intermediate transition zone.

[0042] The transition pipe 4 includes an inclined sliding section and a vertical falling section. The inclined sliding section is connected to the first material extrusion system 1, and the vertical falling section is connected to the second material extrusion system 2. The inclined sliding section facilitates the material sliding into the transition pipe 4, while the vertical falling section facilitates the material falling rapidly into the inlet of the second material extrusion system 2 due to its own gravity. The cross-sectional area of ​​the inlet of the transition pipe 4 is smaller than that of the outlet, making the space at the outlet larger than that at the inlet, and the lower space of the transition pipe 4 is large enough to buffer more material. The cross-sectional area of ​​the transition pipe 4 gradually increases from the inlet to the outlet, making the internal space of the transition pipe 4 gradually increase from the inlet to the outlet, further expanding the buffer space of the intermediate transition zone, so that the material is compressed and compacted in this area.

[0043] The transition pipe 4 includes a first pipe 41 and a second pipe 42. The first pipe 41 is connected to the first material extrusion system 1, and the second pipe 42 is connected to the second material extrusion system 2. The inlet of the first pipe 41 is connected to the outlet of the first material extrusion system 1, and the outlet of the first pipe 41 is connected to the inlet of the second pipe 42. The outlet of the second pipe 42 is connected to the inlet of the second material extrusion system 2. The dimensions of the outlet of the first pipe 41 and the inlet of the second pipe 42 are compatible, and the addition of the second pipe 42 can further increase the buffer space of the intermediate transition zone. The cross-sectional area of ​​the first pipe 41 gradually increases from the inlet to the outlet, while the cross-sectional area of ​​the second pipe 42 is equal from the inlet to the outlet. It should be noted that the second pipe 42 is not a mandatory component and can be configured according to production needs. The height of the second pipe 42 can also be adjusted accordingly. The air generated by the extrusion of materials in the transition pipe 4 can be discharged through the first exhaust device and the third exhaust device, so that a large amount of air is discharged before the material enters the second material extrusion system 2, which greatly increases the density of the material.

[0044] In this embodiment, the first material extrusion system 1 is arranged horizontally, but it can also be arranged at an angle, such as... Figure 12 As shown, when the first material extrusion system 1 is set at an angle, it can better feed the material into the interior of the second material extrusion system 2. In daily production, the first material extrusion system 1 can adopt different assembly angles according to different materials.

[0045] See Figure 2 , Figure 10 and Figure 11In this embodiment, the opening of the second feeding chamber 26 is square, and the outlet of the transition pipe 4 is adapted to the square opening. When the first material extrusion system 1 is located above the second material extrusion system 2, the first material extrusion system 1 can be installed in other positions of the second material extrusion system 2 through the square opening. For example, the first material extrusion system 1 can be located on the left or right side of the second material extrusion system 2 to adapt to different material loading position requirements.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Therefore, although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A dry powder roller press granulator, characterized in that: It includes a first material extrusion system, a second material extrusion system, and a roller pressing mechanism. The discharge port of the first material extrusion system is connected to the feed port of the second material extrusion system, and the discharge port of the second material extrusion system is connected to the roller pressing mechanism. The extrusion end of the first material extrusion system is connected to a first exhaust device, and the extrusion end of the second material extrusion system is connected to a second exhaust device. The first material extrusion system is located above the second material extrusion system, and a transition pipe for extruding and buffering the material is provided between the outlet of the first material extrusion system and the inlet of the second material extrusion system.

2. The dry powder roller press granulator according to claim 1, characterized in that: The feed end of the second material extrusion system is provided with a third exhaust device, which is located on the side of the feed end.

3. A dry powder roller press granulator according to claim 2, characterized in that: The third exhaust device is a filter plate.

4. The dry powder roller press granulator according to claim 1, characterized in that: The first material extrusion system includes two first extrusion screws arranged in parallel, the two first extrusion screws being interlocked and rotating in the same direction.

5. A dry powder roller press granulator according to claim 4, characterized in that: The second material extrusion system includes four parallel second extrusion screws, with adjacent second extrusion screws interlocked and rotating in the same direction.

6. A dry powder roller press granulator according to claim 5, characterized in that: The diameter of the second extrusion screw is smaller than the diameter of the first extrusion screw.

7. A dry powder roller press granulator according to claim 1, characterized in that: The transition pipe includes an inclined sliding section and a vertical falling section. The inclined sliding section is connected to a first material extrusion system, and the vertical falling section is connected to a second material extrusion system.

8. A dry powder roller press granulator according to claim 1, characterized in that: The discharge port of the first material extrusion system is connected to the inlet of the transition pipe, and the discharge port of the transition pipe is connected to the inlet of the second material extrusion system. The cross-sectional area of ​​the inlet of the transition pipe is smaller than the cross-sectional area of ​​the discharge port of the transition pipe.

9. A dry powder roller press granulator according to claim 8, characterized in that: The cross-sectional area of ​​the transition pipe gradually increases from the inlet to the outlet.

10. A dry powder roller press granulator according to claim 1, characterized in that: The transition pipe includes a first pipe and a second pipe, the first pipe being connected to a first material extrusion system and the second pipe being connected to a second material extrusion system; The inlet of the first pipe is connected to the outlet of the first material extrusion system, the outlet of the first pipe is connected to the inlet of the second pipe, and the outlet of the second pipe is connected to the inlet of the second material extrusion system.

11. A dry powder roller press granulator according to claim 10, characterized in that: The cross-sectional area of ​​the first pipe gradually increases from the inlet to the outlet, while the cross-sectional area of ​​the second pipe is equal from the inlet to the outlet.

12. A dry powder roller press granulator according to claim 1, characterized in that: The first material extrusion system is arranged in a horizontal or inclined direction.

13. A dry powder roller press granulator according to any one of claims 1-12, characterized in that: The first exhaust device includes a first exhaust filter element and a first vacuum device connected to the first exhaust filter element; the second exhaust device includes a second exhaust filter element and a second vacuum device connected to the second exhaust filter element. The extrusion end of the first material extrusion system is provided with a first socket for installing a first exhaust filter element, and the extrusion end of the second material extrusion system is provided with a second socket for installing a second exhaust filter element.

14. A dry powder roller press granulator according to claim 13, characterized in that: Both the first and second exhaust filter elements include a housing with a cavity, a sintered filter plate located at the bottom of the housing, and a cover plate located at the top of the housing. The cover plate is provided with a connection port for connecting to a vacuum pumping device.

15. A dry powder roller press granulator according to claim 14, characterized in that: The sintered filter plate is arc-shaped, and its curvature matches the shape of the spiral blades of the extrusion screw.

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