CN214514412U - Two-stage granulating device with different-diameter roller combination and dry granulating machine - Google Patents

Abstract

The utility model relates to a technical field of dry process granulator manufacturing, concretely relates to doublestage whole grain device and dry process granulator of reducing roller combination. A two-stage granulating device with a different-diameter roller combination comprises a first-stage granulating device and a second-stage granulating device which are arranged adjacently, wherein the first-stage granulating device comprises a first-stage granulating roller, the second-stage granulating device comprises a second-stage granulating roller, the diameter of the circumscribed circle of the second-stage granulating roller is larger than that of the circumscribed circle of the first-stage granulating roller, coarse material particles are suitable for being pressed to the second-stage granulating device from the first-stage granulating device, and qualified particles are suitable for being pressed to obtain through the second-stage granulating device. The diameter of the circumscribed circle of the second-stage granulating roller is larger than that of the circumscribed circle of the first-stage granulating roller, so that the space and the area of a working cavity of the second-stage granulating device are effectively enlarged, the sieving flow of granules of all stages of granulation is reasonably, coordinately and synchronously, the pressing of material granules with smaller particle size and poor liquidity is adapted, and the problems of excessive granulation, overheating, material accumulation, material stopping and the like of the second-stage granulating device are better solved.

Description

Two-stage granulating device with different-diameter roller combination and dry granulating machine

Technical Field

The utility model relates to a technical field of dry process granulator manufacturing, concretely relates to doublestage whole grain device and dry process granulator of reducing roller combination.

Background

In the pharmaceutical industry, dry granulation machines are widely used for processing pharmaceutical raw materials with various activities. Most of these raw materials are fine powders, which have different particle sizes, non-uniform densities, poor flowability and easy delamination. These materials must be processed through a granulation process in order to be used in the processing of tablets, capsule fillings, granules or other pharmaceutical products. From a process point of view, roller granulation is considered dry granulation, generally with little or no addition of other chemicals besides the components of the finished product. Granulation is also usually carried out by mechanical compaction without the addition of binders or liquids.

The general dry type granulator comprises a feeding mechanism, a compression roller extruding mechanism, a granulating mechanism and the like. When the dry granulator works, the powdery material is pushed to the compression roller extrusion mechanism by the feeding mechanism, and is pressed into cake-shaped slices by the compression roller extrusion mechanism, and the cake-shaped slices are processed by the pre-crushing, material guiding, primary granule finishing and secondary granule finishing processes of the granulation mechanism, so that the requirement of a client on the granularity of the material can be met. The granulating mechanism is an important working part of the dry granulating machine, and mainly comprises a primary granulating device, a secondary granulating device and the like besides a pre-crushing device, a related transmission device and a material guide baffle.

The existing granulating mechanism is positioned at the downstream of the feeding mechanism and the compression roller extruding mechanism, and a first-stage granulating device and a second-stage granulating device of the granulating mechanism are arranged behind the pre-crushing device. The primary granulating device and the secondary granulating device have the same structural style, and are provided with granulating rollers, screens, net racks, corresponding structural members for adjustment, fixation and the like, and the pre-crushed small pieces are subjected to coarse granulation and final fine granulation in sequence. The primary granulating roller and the secondary granulating roller are arranged in a universal structure with the same diameter and the same rotating speed, and can be used interchangeably.

However, when material particles with smaller particle size and poor fluidity are pressed, excessive granulation fine powder of the second-level granulation is caused to be more due to the fact that the sieving flow of the first-level granulation particles is not matched with the sieving flow of the second-level granulation particles, namely the sieving flow of the coarse particles of the first-level granulation is larger than the sieving flow of the qualified particles of the second-level granulation, the adverse phenomena of material blockage, shutdown and the like of a second-level granulation device occur, and even the second-level screen mesh is damaged in serious cases, so that the normal use of equipment is directly influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a doublestage whole grain device and dry process granulator of reducing roller combination adopts the different one-level whole grain roller of diameter and the whole grain roller combination of second grade, and the granule of the whole grain device of reasonable coordination doublestage is sieved flow, prevents that the whole grain device of second grade from taking place whole grain excessive, long-pending stifled material to shut down or the screen cloth damages scheduling problem.

In order to realize the above-mentioned purpose, the utility model provides a doublestage is whole grain device of reducing roller combination, including the one-level whole grain device and the second grade whole grain device of adjacent setting, the one-level whole grain device includes the one-level whole grain roller, the second grade whole grain device includes the second grade whole grain roller, and the material coarse grain is suitable for the follow the one-level whole grain device is pressed and is sent to the second grade whole grain device, and qualified granule is suitable for the warp obtain after the second grade is whole grain device is pressed and is sent, the circumscribed circle diameter of second grade whole grain roller is greater than the circumscribed circle diameter of one-level whole grain roller.

Furthermore, the primary granulating roller comprises a primary cutter frame and a primary cutter strip, the primary cutter strip is a plurality of primary granulating rollers which are annularly provided with the primary cutter frame for a circle to form a cage structure, and the outermost points of the plurality of primary cutter strips are connected to form a circumscribed circle of the primary granulating roller; the second grade is whole grain roller and is included second grade knife rest and second grade sword strip, the second grade sword strip is a plurality of and ring establishes second grade knife rest a week forms cage structure second grade whole grain roller, a plurality of the point of second grade sword strip outside is connected and is formed the circumscribed circle of second grade whole grain roller.

Further, the circumscribed circle diameter of the secondary sizing roll is at least thirty percent greater than the circumscribed circle diameter of the primary sizing roll.

Further, the width of the secondary cutter bar is larger than that of the primary cutter bar; or the number of the secondary cutter bars is at least one more than that of the primary cutter bars.

Further, one-level whole grain device still includes the one-level screen cloth and is used for the one-level rack of one-level screen cloth installation, the one-level rack is provided with first U profile, the first U profile of one-level screen cloth subsides, one-level whole grain roller is located the U profile intracavity of one-level screen cloth.

Further, one-level whole grain device still includes one-level adjusting part, one-level adjusting part is used for adjusting one-level screen cloth with the cooperation interval of one-level whole grain roller circumcircle.

Further, the whole grain device of second grade still includes the second grade screen cloth and is used for the second grade rack of second grade screen cloth installation, the second grade rack is provided with second U profile, the second grade screen cloth pastes tight second U profile, the whole grain roller of second grade is located the U profile intracavity of second grade screen cloth, the effective working area of second grade screen cloth is greater than the effective working area of one-level screen cloth.

Furthermore, both sides of the primary granulating device are provided with baffles, and the baffles extend downwards to the secondary granulating device.

Further, still include the protection casing, one-level whole grain device and two-level whole grain device all are located the protection casing.

Further, the utility model also provides a dry process granulator adopts the doublestage whole grain device of reducing roller combination as above.

The beneficial effects of the utility model reside in that:

1. the primary size grading roller is arranged on a transmission output shaft of the primary size grading roller and is used for crushing the pre-crushed small pieces into coarse particles, so that the primary size grading roller is also called as coarse size grading and provides basic preparation for improving the working efficiency of the secondary size grading. And (3) obtaining coarse particles from the primary granulating device, then conveying the coarse particles to the secondary granulating device under pressure, and obtaining qualified particles after fine granulation and pressure conveying. The diameter of the circumscribed circle of the second-stage granulating roller is larger than that of the circumscribed circle of the first-stage granulating roller, so that the space and the area of a working cavity of the second-stage granulating device are effectively enlarged, the sieving flow of granules of all stages of granulation is reasonably, coordinately and synchronously, the method is suitable for pressing of material granules with smaller particle size and poor liquidity, and the problems of excessive granulation, overheating, material blockage stopping or screen damage and the like of the second-stage granulating device are better solved.

2. The diameter of the circumscribed circle of the secondary granulating roller is at least thirty percent larger than that of the circumscribed circle of the primary granulating roller, the structure arrangement facilitates the matching of the size of the cutter strip and the granulating roller, can ensure that the width of the cutter strip of the secondary granulating roller is at least larger than that of the cutter strip of the primary granulating roller or more than one cutter strip is arranged, effectively increases the area or frequency of pressing and conveying granules by the cutter strip, and practically improves the yield of finished granules.

3. One-level adjusting part adopts the one-level to adjust the pole, is equipped with the adjustment tank on the one-level rack, and the one-level is adjusted the pole and is set to eccentric shaft shape, inserts in the adjustment tank and rotatably installs on the one-level rack for adjust the cooperation interval of one-level screen cloth and one-level whole grain roller, can guarantee that the slice material passes through the one-level screen cloth fast, prevent many times that the friction from causing the farine too much, guaranteed the high-efficient work of one-level whole grain device.

4. The effective working area of the second-stage screen is larger than that of the first-stage screen, so that the two-stage whole grain sieving flow is coordinated and synchronous, the problems of excessive whole grain, overheating, material accumulation and blockage, shutdown or screen damage and the like are solved, and the material application range of the equipment is expanded better.

5. The baffle is used for collecting scattered powder leaked from the periphery of the compression roller and guiding pre-crushed small pieces or primary whole grain coarse particles to enter the secondary whole grain device for fine whole grain, so that unqualified particles are prevented from being mixed into qualified finished particle products.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic overall structure diagram of a two-stage granulating device with a combination of reducing rollers provided in embodiment 1;

fig. 2 is a structural development view of a one-stage screen used in a two-stage granulating device with a different-diameter roller combination provided in example 1;

fig. 3 is a structural development view of a two-stage screen employed in a two-stage sizing device of a different-diameter roller combination according to embodiment 1.

Description of reference numerals:

1. a primary granulating device; 11. a primary granulating roller; 111. a first stage tool rest; 112. a first-stage cutter bar; 12. a first-stage screen; 13. a first-stage net rack; 14. a primary adjusting rod; 2. a secondary granulation device; 21. a secondary size grading roller; 211. a secondary tool rest; 212. a second-stage cutter bar; 22. a secondary screen; 23. a secondary net rack; 24. a secondary adjusting rod; 3. a baffle plate; 4. a protective cover; 5. scattered powder; 6. pre-crushing the small pieces; 7. and (5) fixing the rod.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

Referring to fig. 1-3, as the utility model provides a doublestage whole grain device of reducing roller combination, including one-level whole grain device 1 and second grade whole grain device 2 of adjacent setting, one-level whole grain device 1 includes one-level whole grain roller 11, and second grade whole grain device 2 includes second grade whole grain roller 21, and the circumscribed circle diameter of second grade whole grain roller 21 is greater than the circumscribed circle diameter of one-level whole grain roller 11, and the material coarse grain is suitable for from one-level whole grain device 1 pressure feed to second grade whole grain device 2, and qualified granule is suitable for obtaining after the pressure feed of second grade whole grain device 2.

The primary sizing roller 11 is mounted on a transmission output shaft thereof, and is also called coarse sizing for crushing the pre-crushed small pieces 6 into coarse particles, so that a foundation is provided for improving the working efficiency of secondary sizing. The material particles are subjected to coarse size stabilization from the primary size stabilization device 1, and then are sent to the secondary size stabilization device 2 under pressure, and qualified particles are obtained after fine size stabilization under pressure. The diameter of the circumscribed circle of the second-stage granulating roller 21 is larger than that of the circumscribed circle of the first-stage granulating roller 11, so that the space and the area of the working cavity of the second-stage granulating device 2 are effectively enlarged, the sieving flow of granules of all stages of granulation is reasonably coordinated and synchronized, the pressing of material granules with smaller grain size and poor liquidity is adapted, and the problems of excessive granulation, overheating, material blockage, shutdown or screen damage and the like of the second-stage granulating device 2 are better solved.

Specifically, the primary granulating device 1 and the secondary granulating device 2 are both mounted on a mounting seat, the primary granulating roller 11 comprises a primary knife rest 111 and a primary knife strip 112, the primary knife strip 112 is a plurality of primary granulating rollers 11 which are annularly provided with the primary knife rest 111 for a circle to form a cage structure, and the outermost points of the primary knife strips 112 are connected to form a circumscribed circle of the primary granulating rollers 11; the second-stage granule finishing roller 21 comprises a second-stage cutter frame 211 and second-stage cutter bars 212, the second-stage cutter bars 212 are a plurality of second-stage granule finishing rollers 21 which are annularly provided with the second-stage cutter frame 211 for a circle to form a cage structure, and the outermost points of the second-stage cutter bars 212 are connected to form a circumscribed circle of the second-stage granule finishing rollers 21. The secondary whole grain roller 21 is arranged on a transmission output shaft of the secondary whole grain roller 21, and the diameter of the circumscribed circle of the secondary whole grain roller 21 is the diameter of the circumscribed circle of the primary whole grain roller 11 increased by at least thirty percent. The diameter of the circumscribed circle of the primary granulating roller 11 is Da, and the diameter Db of the circumscribed circle of the secondary granulating roller 21 is not less than 1.3 Da. The structure arrangement is convenient for the matching of the size of the knife strip and the granulating roller, can ensure that the secondary granulating roller 21 is at least more provided with one knife strip than the primary granulating roller 11, effectively increases the frequency of pressing and conveying the particles by the knife strip, and practically improves the yield of finished particle products.

Further, the width of the secondary blade bars 212 is greater than the width of the primary blade bars 112, the width of the primary blade bars 112 is Wa, and the width of the secondary blade bars 212 is Wb, that is, Wb is greater than Wa. When the number of the first-stage cutter bars 112 is the same as that of the second-stage cutter bars 212, the area of the granules pressed by the cutter bars is effectively increased by Wb being larger than Wa, and the yield of finished granules can be further improved.

As a variable implementation, the secondary blade bars 212 may also be the same size as the primary blade bars 112, and the same effect as above may be achieved when the number of the secondary blade bars 212 is at least one more than the number of the primary blade bars 112.

Further, one-level whole grain device 1 still includes one-level screen cloth 12 and the one-level rack 13 that is used for the installation of one-level screen cloth 12, and one-level rack 13 is provided with first U profile, and first U profile is pasted to one-level screen cloth 12, and one-level whole grain roller 11 is located the U profile of one-level screen cloth 12 intracavity.

Specifically, the width of the first-stage screen 12 is smaller than the axial length of the first-stage net rack 13, and the first-stage net rack 13 is provided with a first U-shaped surface for mounting the first-stage screen 12 and ensuring that the first-stage screen 12 is reliably supported. The first-stage screen 12 is mounted on the first-stage net frame 13 and is tightly attached to the inner curved surface of the first U-shaped surface. The working inner arc radius of the first-stage screen 12 is Ra, and the first-stage whole grain roller 11 is positioned in the U-shaped cavity of the first-stage screen 12 and keeps a certain gap with the first-stage screen 12, namely, Ra is ensured to be more than 0.5 Da. The secondary grading device 2 further comprises a secondary screen 22 and a secondary net rack 23 used for mounting the secondary screen 22, the secondary net rack 23 is provided with a second U-shaped surface similar to the primary net rack 13, and the secondary screen 22 is mounted on the secondary net rack 23 and tightly attached to the inner curved surface of the second U-shaped surface. The radius of an inner circular arc of the second-stage screen 22 is Rb, and the second-stage whole grain roller 21 is positioned in a U-shaped cavity of the second-stage screen 22 and keeps a certain gap with the second-stage screen 22, namely, the Rb is ensured to be larger than 0.5 Db. Through setting up one-level rack 13 and second grade rack 23 into the structure similar, that axial dimension equals the structure, be favorable to manufacturing, dismouting, use and clean the maintenance of relevant parts such as protection casing 4. Through setting up first order screen cloth 12 and second grade screen cloth 22 to the structure similar, the axial size is equal structure, effectively guarantees that the whole grain coarse particle of first order is evenly fallen into the whole grain region of second order. The secondary screen 22 is the same width as the primary screen 12 but less than the axial length of the secondary screen support 23.

The development length of the first-stage screen 12 is La, the development length of the second-stage screen 22 is Lb, in order to ensure the coordination of the screen and the granulating roller, the diameter of the circumscribed circle of the second-stage granulating roller 21 is larger than that of the circumscribed circle of the first-stage granulating roller 11, so that the development length of the second-stage screen 22 is larger than that of the first-stage screen 12, namely Lb is larger than La, the width of the second-stage screen 22 is the same as that of the first-stage screen 12, and the effective working area of the second-stage screen 22 is larger than that of the first-stage screen 12. The effective working area of the second-stage screen 22 is larger than that of the first-stage screen 12, which is beneficial to ensuring the coordinated and synchronous sieving flow of the granules of the two-stage granulation, solving the problems of excessive granulation, overheating, material blockage, shutdown or screen damage and the like, and better expanding the material application range of the equipment.

Further, the primary granulating device 1 further comprises a primary adjusting component, and the primary adjusting component is used for adjusting the matching distance between the primary screen 12 and the primary granulating roller 11.

Specifically, the one-level adjusting part adopts one-level adjusting rod 14, is equipped with the adjustment tank on the one-level rack 13, and one-level adjusting rod 14 sets to eccentric rod shape, inserts in the adjustment tank and rotatably installs on one-level rack 13 for adjust the cooperation interval of one-level screen cloth 12 and one-level whole grain roller 11, can guarantee that the material coarse grain passes through one-level screen cloth 12 fast, prevent to rub repeatedly that it is too much to cause the farine, guaranteed that one-level whole grain device 1 is high-efficient work. Still be equipped with dead lever 7 on the one-level rack 13, dead lever 7 is the shaft-like structure of threaded connection for fix one-level rack 13 on the mount pad, be equipped with the mounting hole of being convenient for dead lever 7 grafting installation on the one-level rack 13. When the matching distance between the primary screen 12 and the primary whole grain roller assembly 11 needs to be adjusted, the primary adjusting rod 14 is rotated, and the primary adjusting rod 14 is inserted into the adjusting groove, and the primary adjusting rod 14 rotates along with the eccentric rod-shaped primary adjusting rod 14, so that the primary screen frame 13 and the primary screen 12 act together. The secondary granulating device 2 further comprises a secondary adjusting rod 24, and the secondary adjusting rod 24 is used for adjusting the matching distance between the secondary screen 22 and the secondary granulating roller 21. The structure of the primary adjusting rod 14 is designed by reference to the primary adjusting rod, and is not described in detail herein. The adjusting assemblies at all levels adopt eccentric adjusting rod structural members for adjusting the matching space between the screen cloth at all levels and the external circle of the granulating roller at all levels, so that the granular materials can be ensured to rapidly pass through the screen cloth, the phenomenon that fine powder is excessive due to repeated friction is prevented, and the efficient work of the granulating device at all levels is ensured.

As a variable embodiment, the primary adjusting assembly can also adopt a common adjusting bolt, and the adjusting bolt is abutted against the primary net rack 13 to act together with the primary screen 12, so that the adjusting function can be achieved.

Further, both sides of the primary granulating device 1 are provided with baffles 3, and the baffles 3 extend downwards to the secondary granulating device 2. Baffle 3 sets up to the panel beating structure for collect scattered powder 5 and the guide that follow the peripheral leakage of compression roller are broken little piece 6 in advance or the coarse grain after the one-level is granulated enters into second grade whole grain device 2 department and is carried out meticulous whole grain, prevents that unqualified granule from sneaking into in the qualified granule finished product.

Further, the two-stage granulation device further comprises a protective cover 4, and the first-stage granulation device 1 and the second-stage granulation device 2 are both positioned in the protective cover 4. The protective cover 4 component is set to be a box-shaped assembly welding frame body, has a structure with a window and a sampling port, and is used for forming a closed space which is convenient for checking pressing and pre-crushing working conditions, and ensuring that the granulating process is not polluted by the external environment.

As a variable embodiment, the first-stage sizing roller 11 and the second-stage sizing roller 21 may also adopt an equal-diameter structure, and at this time, the equal rotation speed of the first-stage sizing roller 11 and the second-stage sizing roller 21 is improved and set to be unequal rotation speed within a certain range, that is, the rotation speed of the second-stage sizing roller 21 is slightly higher than that of the first-stage sizing roller 11, and the effect that the yield and the material application range are superior to those of the existing equal-diameter constant-speed two-stage sizing technology can also be obtained.

Example 2

As the embodiment of the utility model provides a pair of dry granulator adopts embodiment 1 in the doublestage grain device of reducing roller combination, set to the circumscribed circle diameter that is greater than one-level whole grain roller 11 through the circumscribed circle diameter with second grade whole grain roller 21, the space and the area of the 2 working chambers of second grade whole grain device have effectively been enlarged, the granule that makes the whole grain at all levels sieve the flow rationally coordinated synchronous, with the suppression of the less and mobility poor material granule of adaptation particle size, solve the whole grain that second grade whole grain device 2 exists more well excessive, overheated, long-pending material shut down or screen cloth damage scheduling problem, improve the off-the-shelf output of granule conscientiously.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (10)

1. A two-stage sizing device with a different-diameter roller combination, comprising a first-stage sizing device (1) and a second-stage sizing device (2) which are arranged adjacently, wherein the first-stage sizing device (1) comprises a first-stage sizing roller (11), the second-stage sizing device (2) comprises a second-stage sizing roller (21), coarse material particles are suitable for being fed into the second-stage sizing device (2) from the first-stage sizing device (1), and qualified particles are suitable for being obtained after being fed into the second-stage sizing device (2) by pressure, and the two-stage sizing device is characterized in that: the diameter of the circumscribed circle of the secondary granulating roll (21) is larger than that of the circumscribed circle of the primary granulating roll (11).

2. The double-stage pelletizing device of a different-diameter roller combination according to claim 1, characterized in that: the primary granulating roller (11) comprises a primary cutter frame (111) and a primary cutter strip (112), the primary cutter strip (112) is a plurality of primary granulating rollers (11) which are annularly provided with the primary cutter frame (111) for a circle to form a cage structure, and the outermost points of the plurality of primary cutter strips (112) are connected to form a circumscribed circle of the primary granulating roller (11); second grade whole grain roller (21) include second grade knife rest (211) and second grade sword strip (212), second grade sword strip (212) are a plurality of and the ring establishes second grade knife rest (211) a week forms cage structure second grade whole grain roller (21), a plurality of the point of second grade sword strip (212) outside is connected and is formed the circumscribed circle of second grade whole grain roller (21).

3. The double-stage pelletizing device of a different-diameter roller combination according to claim 2, characterized in that: the diameter of the circumscribed circle of the secondary whole grain roller (21) is the diameter of the circumscribed circle of the primary whole grain roller (11) increased by at least thirty percent.

4. The double-stage pelletizing device of a different-diameter roller combination according to claim 2, characterized in that: the width of the secondary blade bar (212) is larger than that of the primary blade bar (112); or the number of the secondary cutter bars (212) is at least one more than that of the primary cutter bars (112).

5. The double-stage pelletizing device of a different-diameter roller combination according to claim 1, characterized in that: one-level whole grain device (1) still includes one-level screen cloth (12) and is used for one-level rack (13) of one-level screen cloth (12) installation, one-level rack (13) are provided with first U profile, one-level screen cloth (12) paste tight first U profile, one-level whole grain roller (11) are located the U profile intracavity of one-level screen cloth (12).

6. The double-stage granulation device with a combination of reducing rollers as set forth in claim 5, wherein: the primary granulating device (1) further comprises a primary adjusting component, and the primary adjusting component is used for adjusting the matching distance between the primary screen (12) and the circumcircle of the primary granulating roller (11).

7. The double-stage granulation device with a combination of reducing rollers as set forth in claim 5, wherein: second grade whole grain device (2) still include second grade screen cloth (22) and be used for second grade rack (23) of second grade screen cloth (22) installation, second grade rack (23) are provided with second U profile, second grade screen cloth (22) paste tight second U profile, second grade whole grain roller (21) are located the U profile intracavity of second grade screen cloth (22), the effective work area of second grade screen cloth (22) is greater than the effective work area of one-level screen cloth (12).

8. The double-stage granulation device with the combination of the reducing rollers as claimed in any one of claims 1 to 7, wherein: both sides of the primary granulating device (1) are provided with baffles (3), and the baffles (3) extend downwards to the secondary granulating device (2).

9. The double-stage granulation device with the combination of the reducing rollers as claimed in any one of claims 1 to 7, wherein: the device is characterized by further comprising a protective cover (4), wherein the primary granulating device (1) and the secondary granulating device (2) are both located in the protective cover (4).

10. A dry granulator is characterized in that: a two-stage pelletizing device using a combination of reducing rolls according to any one of claims 1 to 9.

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