Sealing, scraping and guiding combined device and dry type granulator

Abstract

The utility model relates to the technical field of pharmaceutical equipment, and discloses a sealing, scraping and guiding combined device and a dry type granulator, the sealing, scraping and guiding combined device comprises: an end face sealing device, which encloses a pre-pressing space, a main compaction space and a discharge space with the outer peripheral surfaces of a first compression roller and a second compression roller; the scraping and guiding device comprises a first scraper and a second scraper, the first scraper and the second scraper are suitable for shoveling, scraping and removing materials adhered to the peripheral surfaces of the first compression roller and the second compression roller, a guiding space is formed between the first scraper and the second scraper, and an outlet of the guiding space is communicated with an inlet of the granulating cavity. According to the sealing, scraping and guiding combined device provided by the utility model, the first scraper and the second scraper are arranged to scrape and remove materials adhered to the peripheral surface of the compression roller, and the materials are guided to the granulating cavity through the guiding space between the first scraper and the second scraper, so that the scraping and guiding device integrates a material scraping function and a material guiding function; therefore, the structure of the sealing scraper combination device is more compact, and the requirement for small and exquisite appearance of equipment is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to pharmaceutical equipment technical field, concretely relates to a seal scrape guide combination device and dry process granulator. BACKGROUND

[0002] In the pharmaceutical industry, dry process granulator is widely used in processing and treating various active pharmaceutical raw materials and one or more excipients. The dry process granulator is mainly composed of a feeding mechanism, a pressure roller extrusion mechanism and a granulating mechanism, etc. The powdery material is pushed by the feeding mechanism to the pressure roller extrusion mechanism, and is pressed into a solid cake sheet by the pressure roller pair. Through the whole granulation process of the granulating mechanism, the granular product with increased density, uniform particle size and good fluidity is obtained. In addition to the pressure roller pair, the pressure roller extrusion mechanism also includes an end face sealing device matched with the end face of the pressure roller and a scraper device matched with the circumferential surface of the pressure roller. A surrounding plate is installed downstream of the scraper device to guide the sheet material peeled off and self-fallen to the whole granulation cavity of the granulating mechanism. Generally, the end face sealing device and the scraper device are arranged around the pressure roller pair. For mass production models, the surrounding plate is mostly arranged at the entrance of the whole granulation cavity downstream of the scraper device, and is separated from the end face sealing device and the scraper device by a certain distance, so that the structure space is relatively open, which not only meets the sealing, scraping and guiding function requirements, but also facilitates the installation, disassembly, cleaning and maintenance operations. However, for research experimental models or models applied in narrow spaces, the structure space is limited, and the equipment is required to be small in appearance. However, the structure space layout among the end face sealing device, the scraper device and the surrounding plate in the prior art is difficult to meet the requirements. SUMMARY

[0003] Therefore, the utility model provides a seal scrape guide combination device and dry process granulator to solve the problem that the structure space among the end face sealing device, the scraper device and the surrounding plate is open, and it is difficult to meet the requirement of small equipment appearance.

[0004] In the first aspect, the utility model provides a seal scrape guide combination device, which is arranged around the pressure roller pair and is suitable for blocking the material before being compacted by the pressure roller pair and guiding the compacted material to the entrance of the whole granulation cavity. The pressure roller pair includes a first pressure roller and a second pressure roller, and the seal scrape guide combination device includes:

[0005] An end face sealing device, which is in surface contact with the first pressure roller and the second pressure roller, and forms a pre-pressing space, a main compacting space and a discharging space with the mutually close outer circumferential surfaces of the first pressure roller and the second pressure roller along the material moving direction;

[0006] A scraping and guiding device is provided on the side of the pressure roller pair facing the discharge space. The scraping and guiding device includes a first scraper and a second scraper arranged at intervals. Parts of the first scraper and the second scraper are located in the discharge space and are suitable for scraping and removing the material adhering to the outer peripheral surfaces of the first pressure roller and the second pressure roller. A guiding space is formed between the first scraper and the second scraper, and the outlet of the guiding space is connected to the inlet of the granulation chamber.

[0007] Beneficial effects: By setting the first and second scrapers to scrape and remove the material adhering to the outer circumference of the pressure roller, and by guiding the material into the granulation chamber through the guide space between the first and second scrapers, the scraping and guiding device integrates the scraping and guiding functions into one, thus making the structure of the sealing scraper combination device more compact and helping to meet the requirements of small equipment size.

[0008] In one optional embodiment, the end face sealing device includes two liners, which are parallel and spaced apart, and a pressure roller pair is located between the two liners, with the same side end face of the first pressure roller and the second pressure roller in contact with the liner surface.

[0009] Beneficial effect: The two liners form a surface contact fit with the two end faces of the first and second pressure rollers on the same side, thereby preventing material leakage in the space gap between the first and second pressure rollers along the axial direction of the first pressure roller.

[0010] In an alternative embodiment, the end face sealing device further includes a first cheek plate and a second cheek plate, the first cheek plate abutting against one of the liner plates on the side opposite to the pressure roller pair, the second cheek plate abutting against the other liner plate on the side opposite to the pressure roller pair, and the first cheek plate and the second cheek plate being connected to the two liner plates.

[0011] In one alternative embodiment, a first elastic member is provided between the first cheek plate and the adjacent liner, the first elastic member being in a compressed state, and a second elastic member is provided between the second cheek plate and the adjacent liner, the second elastic member also being in a compressed state.

[0012] Beneficial effects: By setting a first elastic element and a second elastic element in a compressed state, even after wear occurs on the side of the liner that is used for sliding contact with the pressure roller, the elastic force of the elastic element keeps the liner in a tight abutment with the end face of the pressure roller, ensuring the sealing effect of the liner and thus improving the service life of the liner.

[0013] In one alternative embodiment, the first elastic element comprises a silicone tube; the second elastic element comprises a silicone tube.

[0014] In one alternative embodiment, a first groove is formed in a partial recess on the end face of the first cheek plate facing the second cheek plate, and at least a portion of the first elastic member is located within the first groove; a second groove is formed in a partial recess on the end face of the second cheek plate facing the second cheek plate, and at least a portion of the second elastic member is located within the second groove.

[0015] Beneficial effects: By placing at least a portion of the first elastic member within the first groove and at least a portion of the second elastic member within the second groove, accidental movement of the first and second elastic members is avoided, thereby improving the stability and reliability of the cheek plate abutting against the liner through the elastic members.

[0016] In one optional embodiment, a first scraper is disposed near a first pressure roller, and the first cutting edge of the first scraper has a gap with the outer peripheral surface of the first pressure roller; a second scraper is disposed near a second pressure roller, and the second cutting edge of the second scraper has a gap with the outer peripheral surface of the second pressure roller.

[0017] Beneficial effects: By creating a gap between the blade edge of the scraper and the outer circumferential surface of the pressure roller, wear caused by contact between the blade edge and the outer circumferential surface of the pressure roller is avoided, thereby improving the service life of the pressure roller and the scraper.

[0018] In one optional embodiment, the sealing scraper assembly further includes a first support shaft and a second support shaft fixedly disposed thereon. A first scraper is disposed on the first support shaft and is adapted to rotate around the first support shaft to adjust the gap between the first cutting edge and the outer peripheral surface of the first pressure roller. A second scraper is disposed on the second support shaft and is adapted to rotate around the second support shaft to adjust the gap between the second cutting edge and the outer peripheral surface of the second pressure roller.

[0019] Beneficial effects: The scraper is rotatably mounted on the support shaft. By rotating the scraper around the support shaft, the gap between the scraper's cutting edge and the circumferential surface of the pressure roller can be adjusted.

[0020] In one optional embodiment, along the material movement direction, the side of the first scraper near the second scraper is sequentially formed with a first front blade surface and a first guide surface, the included angle between the first front blade surface and the first guide surface being α, wherein 90° < α < 180°; along the material movement direction, the side of the second scraper near the first scraper is sequentially formed with a second front blade surface and a second guide surface, the included angle between the second front blade surface and the second guide surface being β, wherein 90° < β < 180°.

[0021] Beneficial effect: By setting the front blade face and the guide face at an obtuse angle, it is easier to guide and break the sheet material scraped off the outer peripheral surface of the pressure roller by the scraper blade edge.

[0022] Secondly, this utility model also provides a dry granulation machine, including the aforementioned sealing and scraping guide assembly.

[0023] Since the dry granulation machine includes a sealing scraper assembly, which has the same effect as the sealing scraper assembly, its beneficial effects will not be elaborated here. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a front view of a sealing and scraping guide assembly according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 A partially cut-away side view of the sealing scraper assembly shown;

[0027] Figure 3 for Figure 1 The diagram shows the structure of the liner.

[0028] Figure 4 for Figure 1 The diagram shows the structure of the first cheek plate.

[0029] Figure 5 for Figure 4 Schematic diagram of section AA;

[0030] Figure 6 for Figure 1 The diagram shows the structure of the second cheek plate.

[0031] Figure 7 for Figure 1 The diagram shows the structure of the first scraper.

[0032] Figure 8 for Figure 1 The diagram shows the structure of the second scraper;

[0033] Figure 9 for Figure 1 A magnified view of a portion of point B in the middle.

[0034] Explanation of reference numerals in the attached figures:

[0035] 11. First pressure roller; 12. Second pressure roller; 13. First drive shaft; 14. Second drive shaft; 20. End face sealing device; 21. Liner plate; 22. First cheek plate; 221. First groove; 23. Second cheek plate; 231. Second groove; 24. Fastener; 25. First elastic element; 26. Second elastic element; 30. Scraper guide device; 31. First scraper; 311. First scraper body; 312. First scraper tail; 313. First cutting edge; 314. 315. First guide surface; 32. First front blade face; 32. Second scraper; 321. Second scraper body; 322. Second scraper tail; 323. Second cutting edge; 324. Second guide surface; 325. Second front blade face; 33. First support shaft; 34. Second support shaft; 35. Bolt; 36. Threaded hole; 37. Through hole; 38. Through gap; 39. Mounting hole; 40. Pre-compression space; 41. Main compaction space; 42. Discharge space; 43. Guide space. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] The following is combined with Figures 1 to 9 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, a sealing and scraping guide assembly is provided, disposed around the periphery of a pressure roller pair, and adapted to block the material before it is compacted by the pressure roller pair, and to guide the compacted material to the inlet of the granulation chamber. The pressure roller pair includes a first pressure roller 11 and a second pressure roller 12, and the sealing and scraping guide assembly includes:

[0039] The end face sealing device 20 is in contact with the first pressure roller 11 and the second pressure roller 12, and along the material movement direction, it surrounds the outer peripheral surfaces of the first pressure roller 11 and the second pressure roller 12 to form a pre-compression space 40, a main compaction space 41 and a discharge space 42.

[0040] The scraping and guiding device 30 is disposed on the side of the pressure roller pair facing the discharge space. The scraping and guiding device 30 includes a first scraper 31 and a second scraper 32 arranged at intervals. Parts of the first scraper 31 and the second scraper 32 are located in the discharge space and are suitable for scraping and removing the material adhering to the outer peripheral surface of the first pressure roller 11 and the second pressure roller 12. A guiding space 43 is formed between the first scraper 31 and the second scraper 32. The outlet of the guiding space 43 is connected to the inlet of the granulation chamber.

[0041] The sealing scraper and guide assembly provided in this embodiment removes the material adhering to the outer circumference of the pressure roller by setting a first scraper 31 and a second scraper 32, and guides the material into the granulation chamber through the guide space 43 between the first scraper 31 and the second scraper 32. This makes the scraper and guide assembly 30 integrate the scraping and guiding functions, making the structure of the sealing scraper assembly more compact and helping to meet the requirement of small equipment size.

[0042] Specifically, the pressure roller extrusion mechanism includes a pressure roller pair, a first drive shaft 13, and a second drive shaft 14. The first pressure roller 11 is mounted on the first drive shaft 13, and the second pressure roller 12 is mounted on the second drive shaft 14. The first drive shaft 13 drives the first pressure roller 11 to rotate, and the second drive shaft 14 drives the second pressure roller 12 to rotate. The rotation directions of the first drive shaft 13 and the second drive shaft 14 are opposite. The rotation axes of the first pressure roller 11 and the second pressure roller 12 are parallel to each other, and there is a gap between the first pressure roller 11 and the second pressure roller 12. The end face sealing device 20 is correspondingly disposed at the gap and forms a surface contact sliding fit with the end faces of the first pressure roller 11 and the second pressure roller 12, thereby ensuring that the pre-compression space 40, the main compaction space 41, and the discharge space 42 do not leak or leak minimally. The first scraper 31 and the second scraper 32 are used to scrape the material adhering to the outer circumferential surface of the first pressure roller 11 and the second pressure roller 12 to ensure that the outer circumferential surface of the pressure roller is clean. The side walls of the two scrapers that are close to each other serve as the side walls of the guide space 43 so as to guide all the sheet material into the granulation chamber.

[0043] In one embodiment, combined Figures 1 to 3 as well as Figure 9 As shown, the end face sealing device 20 includes two liner plates 21, which are parallel and spaced apart. The pressure roller pair is located between the two liner plates 21, and the same side end face of the first pressure roller 11 and the second pressure roller 12 is in contact with the liner plate 21.

[0044] The sealing scraping and guiding assembly provided in this embodiment has two liner plates 21 that form surface contact with the two end faces of the first pressure roller 11 and the second pressure roller 12 located on the same side, thereby preventing material leakage at the gap between the first pressure roller 11 and the second pressure roller 12 along the axial direction of the first pressure roller 11.

[0045] Specifically, the main planes of the two liners 21 are parallel to each other, and the axes of the first pressure roller 11 and the second pressure roller 12 are perpendicular to the main planes of the liners 21. The main planes of the liners 21 form a surface contact sliding fit with the end faces of the pressure rollers to serve as the side walls of the pre-compression space 40, the main compaction space 41, and the discharge space 42. The liners 21 make slight contact with the end faces of the pressure rollers to avoid excessive interaction forces that could accelerate wear and shorten the equipment's service life, and to avoid insufficient interaction forces that would prevent the material from being blocked.

[0046] In one embodiment, combined Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, the end face sealing device 20 also includes a first cheek plate 22 and a second cheek plate 23. The first cheek plate 22 abuts against the side of one of the liner plates 21 away from the pressure roller pair, and the second cheek plate 23 abuts against the side of the other liner plate 21 away from the pressure roller pair. The first cheek plate 22 and the second cheek plate 23 are connected to the two liners 21.

[0047] Specifically, the first cheek plate 22 and the second cheek plate 23 are fixedly connected by fasteners 24 to clamp the two liners 21 onto the two end faces of the pressure roller assembly. The fasteners 24 include bolts, screws, or rivets. The liners 21 have through holes corresponding to the fasteners 24, through which the fasteners 24 pass and connect the first cheek plate 22, the second cheek plate 23, and the liners 21 together.

[0048] In one embodiment, combined Figure 2 , Figures 4 to 6 As shown, a first elastic member 25 is provided between the first cheek plate 22 and the liner 21 adjacent thereto, and the first elastic member 25 is in a compressed state; a second elastic member 26 is provided between the second cheek plate 23 and the liner 21 adjacent thereto, and the second elastic member 26 is also in a compressed state.

[0049] The sealing scraper assembly provided in this embodiment, by setting a first elastic element 25 and a second elastic element 26 in a compressed state, ensures that after wear occurs on the side of the liner 21 used for sliding contact with the pressure roller, the elastic force of the elastic element keeps the liner 21 in a tight abutment with the end face of the pressure roller, thus ensuring the sealing function of the liner 21 and improving the service life of the liner 21.

[0050] In one embodiment, the first elastic element 25 includes a silicone tube; the second elastic element 26 includes a silicone tube.

[0051] Specifically, the first elastic element 25 includes a silicone tube, a silicone strip, a spring, a rubber pad, or a rubber tube; the second elastic element 26 includes a silicone tube, a silicone strip, a spring, a rubber pad, or a rubber tube.

[0052] In one embodiment, combinedFigure 2 , Figures 4 to 6 As shown, a first groove 221 is formed in a partial recess on the end face of the first cheek plate 22 facing the second cheek plate 23, and at least a portion of the first elastic member 25 is located in the first groove 221; a second groove 231 is formed in a partial recess on the end face of the second cheek plate 23 facing the second cheek plate 23, and at least a portion of the second elastic member 26 is located in the second groove 231.

[0053] The sealing scraping guide assembly provided in this embodiment improves the stability and reliability of the cheek plate pressing against the liner through the elastic members by ensuring that at least a portion of the first elastic member 25 is located within the first groove 221 and at least a portion of the second elastic member 26 is located within the second groove 231, thereby preventing accidental movement of the first elastic member 25 and the second elastic member 26.

[0054] As one feasible implementation, the first groove 221 is elongated and extends in a direction parallel to the main plane of the first cheek plate 22. The first elastic member 25 is a rubber tube, the length of which is adapted to the length of the first groove 221. The rubber tube is placed in the first groove 221, with a portion of the rubber tube exposed outside the first groove 221. The first cheek plate 22 abuts against the liner 21 through the first elastic member 25. The second groove 231 is elongated and extends in a direction parallel to the main plane of the second cheek plate 23. The second elastic member 26 is a rubber tube, the length of which is adapted to the length of the second groove 231. The rubber tube is placed in the second groove 231, with a portion of the rubber tube exposed outside the second groove 231. The second cheek plate 23 abuts against the liner 21 through the second elastic member 26.

[0055] In one embodiment, combined Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the first scraper 31 is disposed near the first pressure roller 11, and the first cutting edge 313 of the first scraper 31 has a gap with the outer peripheral surface of the first pressure roller 11; the second scraper 32 is disposed near the second pressure roller 12, and the second cutting edge 323 of the second scraper 32 has a gap with the outer peripheral surface of the second pressure roller 12.

[0056] The sealing scraper assembly provided in this embodiment improves the service life of the pressure roller and the scraper by creating a gap between the scraper blade and the outer peripheral surface of the pressure roller to avoid wear caused by contact between the scraper blade and the outer peripheral surface of the pressure roller.

[0057] Specifically, the first scraper 31 has a first cutting edge 313 at one end near the first pressure roller 11. The first cutting edge 313 is a straight single-edged type and is parallel to the axis and outer circumferential surface of the first pressure roller 11. The second scraper 32 has a second cutting edge 323 at one end near the second pressure roller 12. The second cutting edge 323 is a straight single-edged type and is parallel to the axis and outer circumferential surface of the second pressure roller 12.

[0058] In one embodiment, the distance between the first cutting edge 313 and the outer peripheral surface of the first pressure roller 11 is h1, wherein 0 mm < h1 ≤ 0.1 mm; the distance between the second cutting edge 323 and the outer peripheral surface of the second pressure roller 12 is h2, wherein 0 mm < h2 ≤ 0.1 mm.

[0059] In one embodiment, combined Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the sealing scraper assembly also includes a first support shaft 33 and a second support shaft 34 fixedly arranged. A first scraper 31 is disposed on the first support shaft 33 and is adapted to rotate around the first support shaft 33 to adjust the gap between the first cutting edge 313 and the outer peripheral surface of the first pressure roller 11. A second scraper 32 is disposed on the second support shaft 34 and is adapted to rotate around the second support shaft 34 to adjust the gap between the second cutting edge 323 and the outer peripheral surface of the second pressure roller 12.

[0060] The sealing scraper assembly provided in this embodiment has a scraper that is rotatably mounted on a support shaft. By rotating the scraper around the support shaft, the gap between the scraper's cutting edge and the circumferential surface of the pressure roller can be adjusted.

[0061] Specifically, the first scraper 31 is rotatably mounted on the first support shaft 33, the axis of the first support shaft 33 being parallel to the axis of the first pressure roller 11, and the second scraper 32 is rotatably mounted on the second support shaft 34, the axis of the second support shaft 34 being parallel to the axis of the second pressure roller 12.

[0062] The first scraper 31 includes a first scraper body 311 and a first scraper tail 312. The first scraper tail 312 is located on the side of the first scraper body 311 away from the pressure roller pair, so as to guide the material into the granulation chamber. The second scraper 32 includes a second scraper body 321 and a second scraper tail 322. The second scraper tail 322 is located on the side of the second scraper body 321 away from the second pressure roller 12, so as to guide the material into the granulation chamber. The first scraper body 311 and the second scraper body 321 are respectively provided with mounting holes 39. The axis of the mounting holes 39 is parallel to the axis of the first pressure roller 11 and the second pressure roller 12. The first scraper 31 and the second scraper 32 are respectively sleeved on the first support shaft 33 and the second support shaft 34 through the mounting holes 39.

[0063] The first scraper body 311 and the second scraper body 321 have through gaps 38 corresponding to the mounting holes 39, and threaded holes 36 and through holes 37 are respectively provided on both sides of the through gaps 38. A bolt 35 is passed through the through hole 37 and screwed into the threaded hole 36, so that the tightness between the mounting hole 39 and the first support shaft 33 or the second support shaft 34 can be adjusted by rotating the bolt 35. This constructs the first scraper body 311 and the second scraper body 321 as a structure similar to a single-sided pipe clamp. When it is necessary to adjust the gap between the first cutting edge 313 and the first pressure roller 11, or to adjust the gap between the second cutting edge 323 and the second pressure roller 12, loosen the bolt 35 until the scraper can rotate relative to the support shaft. After adjusting the scraper to the correct position, tighten the bolt 35 until the relative position of the scraper and the support shaft is fixed. The pressure roller pair is located inside the machine housing. The first support shaft 33 and the second support shaft 34 are stepped cylindrical and fixed to the machine housing.

[0064] In one embodiment, combined Figure 1 , Figure 7 and Figure 8 As shown, along the material movement direction, the first scraper 31 has a first front blade surface 315 and a first guide surface 314 sequentially formed on the side near the second scraper 32, and the included angle between the first front blade surface 315 and the first guide surface 314 is α, where 90° < α < 180°; along the material movement direction, the second scraper 32 has a second front blade surface 325 and a second guide surface 324 sequentially formed on the side near the first scraper 31, and the included angle between the second front blade surface 325 and the second guide surface 324 is β, where 90° < β < 180°.

[0065] The sealing scraper and guide assembly provided in this embodiment sets the front blade surface and the guide surface at an angle to guide and break the sheet material scraped off the outer peripheral surface of the pressure roller by the scraper blade edge.

[0066] Specifically, the first front blade surface 315 and the second front blade surface 325 both serve to guide the material, and the distance between the first front blade surface 315 and the second front blade surface 325 gradually decreases along the material movement direction. The first guide surface 314 extends from the first scraper body 311 to the first scraper tail 312; the second guide surface 324 extends from the second scraper body 321 to the second scraper tail 322.

[0067] According to an embodiment of the present invention, another aspect provides a dry granulation machine, including the above-mentioned sealing scraper assembly.

[0068] Specifically, the dry pellet mill includes a feeding mechanism, a pressure roller extrusion mechanism, and a pelletizing mechanism. The pressure roller extrusion mechanism includes an end face sealing device 20, a scraper guide device 30, a pressure roller pair, a first drive shaft 13, and a second drive shaft 14. The pelletizing mechanism includes a pelletizing chamber. The scraper guide device 30 is adapted to guide the material scraped and removed to the inlet of the pelletizing chamber.

[0069] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A sealing scraping guide assembly, characterized in that, The pressure roller assembly is located around the periphery of the pressure roller pair and is adapted to block the material before it is compacted by the pressure roller pair, and to guide the compacted material to the inlet of the granulation chamber. The pressure roller pair includes a first pressure roller (11) and a second pressure roller (12). The sealing and scraping guide assembly includes: The end face sealing device (20) is in contact with the first pressure roller (11) and the second pressure roller (12) and, along the material moving direction, surrounds the outer peripheral surfaces of the first pressure roller (11) and the second pressure roller (12) to form a pre-compression space (40), a main compaction space (41) and a discharge space (42). A scraping guide device (30) is disposed on the side of the pressure roller pair facing the discharge space. The scraping guide device (30) includes a first scraper (31) and a second scraper (32) arranged at intervals. Parts of the first scraper (31) and the second scraper (32) are located in the discharge space and are adapted to scrape and remove the material adhering to the outer peripheral surface of the first pressure roller (11) and the second pressure roller (12). A guide space (43) is formed between the first scraper (31) and the second scraper (32). The outlet of the guide space (43) is connected to the inlet of the granulation chamber.

2. The sealing and scraping guide assembly according to claim 1, characterized in that, The end face sealing device (20) includes two liner plates (21), which are parallel and spaced apart. The pressure roller pair is located between the two liner plates (21), and the same side end face of the first pressure roller (11) and the second pressure roller (12) is in contact with the liner plate (21).

3. The sealing and scraping guide assembly according to claim 2, characterized in that, The end face sealing device (20) further includes a first cheek plate (22) and a second cheek plate (23). The first cheek plate (22) abuts against one of the liner plates (21) on the side away from the pressure roller pair, and the second cheek plate (23) abuts against the other liner plate (21) on the side away from the pressure roller pair. The first cheek plate (22) and the second cheek plate (23) are connected to the two liner plates (21).

4. The sealing and scraping guide assembly according to claim 3, characterized in that, A first elastic element (25) is provided between the first cheek plate (22) and the adjacent liner (21), the first elastic element (25) being in a compressed state. A second elastic element (26) is provided between the second cheek plate (23) and the adjacent liner (21), the second elastic element (26) also being in a compressed state.

5. The sealing and scraping guide assembly according to claim 4, characterized in that, The first elastic element (25) includes a silicone tube; the second elastic element (26) includes a silicone tube.

6. The sealing and scraping guide assembly according to claim 4, characterized in that, The first cheek plate (22) has a first groove (221) formed in a partial area of ​​its end face facing the second cheek plate (23), and the first elastic member (25) is located in at least a partial area of ​​the first groove (221); the second cheek plate (23) has a second groove (231) formed in a partial area of ​​its end face facing the second cheek plate (23), and the second elastic member (26) is located in at least a partial area of ​​the second groove (231).

7. The sealing and scraping guide assembly according to any one of claims 1 to 6, characterized in that, The first scraper (31) is disposed close to the first pressure roller (11), and the first cutting edge (313) of the first scraper (31) has a gap with the outer peripheral surface of the first pressure roller (11); the second scraper (32) is disposed close to the second pressure roller (12), and the second cutting edge (323) of the second scraper (32) has a gap with the outer peripheral surface of the second pressure roller (12).

8. The sealing and scraping guide assembly according to claim 7, characterized in that, The sealing scraper assembly also includes a first support shaft (33) and a second support shaft (34) fixedly arranged. The first scraper (31) is disposed on the first support shaft (33) and is adapted to rotate around the first support shaft (33) to adjust the gap between the first cutting edge (313) and the outer peripheral surface of the first pressure roller (11). The second scraper (32) is disposed on the second support shaft (34) and is adapted to rotate around the second support shaft (34) to adjust the gap between the second cutting edge (323) and the outer peripheral surface of the second pressure roller (12).

9. The sealing and scraping guide assembly according to claim 1, characterized in that, Along the material movement direction, the first scraper (31) has a first front blade surface (315) and a first guide surface (314) formed sequentially on the side of the first scraper (32) near the second scraper (32). The included angle between the first front blade surface (315) and the first guide surface (314) is α, where 90° < α < 180°. Along the material movement direction, the second scraper (32) has a second front blade surface (325) and a second guide surface (324) formed sequentially on the side of the second scraper (31) near the first scraper (31). The included angle between the second front blade surface (325) and the second guide surface (324) is β, where 90° < β < 180°.

10. A dry granulation machine, characterized in that, include: The sealing scraper assembly according to any one of claims 1 to 9.

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