Drying device

Abstract

The utility model provides a drying device. The drying device comprises a crushing device, a scraper conveying device and a rotary drum drying device which are sequentially connected in series. The scraper conveying device comprises a conveying groove and a steam heating bin arranged at the bottom of the conveying groove. The rotary drum drying device is also connected with a hot air supply device; the hot air output end of the rotary drum drying device is connected with the heat exchange medium input end of the steam heating bin. According to the device, through cooperative use of the structures, heat in hot air output by the rotary drum drying device is reused, and the defect that when a traditional hot air drying device is used for drying materials, heat is difficult to fully utilize, and consequently energy is wasted is overcome.

Description

Technical Field

[0001] The present application relates to the technical field of material drying, and in particular to a drying device. Background Art

[0002] In the production process of chemical pharmaceuticals, it is often necessary to dry the filter cake formed by the target product obtained by filtration. At present, the common drying methods mainly include hot air drying, vacuum freeze drying, infrared drying, microwave drying, etc. Among them, hot air drying is one of the most widely used drying methods. The drying process uses dry hot air as the drying medium, and exchanges heat and moisture with the wet material in a natural or forced convection circulation manner. The moisture on the surface of the material is water vapor, and diffuses to the main body of the air flow through the air film on the surface; at the same time, as a result of the vaporization of the material surface, a moisture gradient difference is generated between the inside and the surface of the material, and the moisture inside the material diffuses to the surface in the form of vapor or liquid to achieve the method of drying the wet material.

[0003] In the existing hot air drying method, after the material is dried, cold air is introduced to cool the material and cool the humid hot air at the same time, so that the water vapor therein condenses and is discharged. However, this method fails to fully utilize the heat in the hot air, resulting in energy waste. Utility Model Content

[0004] The present application provides a drying device for solving the problem of energy waste caused by the difficulty in fully utilizing heat when drying materials in existing hot air drying devices.

[0005] The present application provides a drying device, comprising a crushing device, a scraper conveying device and a rotary drying device connected in series in sequence;

[0006] The scraper conveyor device comprises a conveying trough and a steam heating chamber arranged at the bottom of the conveying trough;

[0007] The rotary drying device is also connected to the hot air supply device; the hot air output end of the rotary drying device is connected to the input end of the heat exchange medium of the steam heating bin.

[0008] Optionally, the crushing device comprises a crushing device body, and the crushing device body comprises a first crushing chamber, a stirring chamber and a second crushing chamber in order from top to bottom;

[0009] A first crushing roller is arranged in the first crushing chamber, the first crushing roller comprises a first rotating shaft and a plurality of crushing blades arranged in an array on the periphery of the first rotating shaft, and the crushing blades are arranged at a certain angle to the first rotating shaft;

[0010] A stirring paddle is arranged in the stirring chamber along the horizontal direction;

[0011] A pair of second crushing rollers are arranged in the second crushing chamber. The second crushing rollers include a second rotating shaft and a plurality of cutting knives arranged in an array on the periphery of the second rotating shaft. The cutting knives on the pair of second crushing rollers are arranged to mesh with each other.

[0012] Optionally, a return scraper chain is provided in the conveying trough;

[0013] A feed hopper is arranged at one end of the conveying trough and a discharge port is arranged at the other end; an air collecting bin is arranged at the top of the conveying trough, and an axial flow fan is arranged in the air collecting bin.

[0014] Optionally, a deflection baffle is provided in the steam heating chamber.

[0015] Optionally, a liquid collecting chamber is provided at the bottom of the steam heating chamber; the steam heating chamber and the liquid collecting chamber are separated by a porous plate.

[0016] Optionally, the rotary drum drying device comprises: a rotary drum, an input bin and an output bin respectively arranged at two ends of the rotary drum;

[0017] A gear ring is arranged on the outer periphery of the rotating drum, and meshes with the gear on the power output shaft of the motor through the gear ring.

[0018] Optionally, the rotating drum comprises an inner drum and an outer drum which are coaxially arranged; the inner drum and the outer drum are of equal length;

[0019] The inner cylinder is provided with a plurality of sieve holes; the inner wall of the inner cylinder is provided with a plurality of inner cylinder copying plates arranged in an array along the length direction of the inner cylinder;

[0020] The inner wall of the inner cylinder is also connected to a plurality of grinding balls via flexible ropes;

[0021] The inner wall of the outer cylinder is provided with a plurality of outer cylinder copying plates in a spiral array along the length direction of the outer cylinder.

[0022] Optionally, a hopper is provided on the top of the input bin, and the hopper is connected to a material guide trough provided inside the input bin; an output port of the material guide trough extends into the inner cylinder;

[0023] An exhaust port is provided on the side of the input bin away from the drum;

[0024] A material discharge port is provided at the bottom of the output bin, and an air inlet is provided at a side of the output bin away from the rotating drum, and the air inlet is connected to the hot air supply device.

[0025] The present application provides a drying device, which provides a steam heating bin at the bottom of a scraper conveyor device, connects the hot air output end of a rotary drying device to the steam heating bin, and inputs the hot air after the rotary drying device dries the material into the steam heating bin to preheat the wet material, so as to further utilize the waste heat in the hot air. The device of the present application reuses the heat in the hot air output by the rotary drying device through the coordinated use of the above structure, thus overcoming the drawback of the traditional hot air drying device that it is difficult to fully utilize the heat when drying materials, resulting in energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of a drying device provided in one embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a crushing device provided in one embodiment of the present application;

[0029] Figure 3 A schematic diagram of the structure of a first crushing roller provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the structure of a second crushing roller provided in one embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of a scraper conveyor device provided in one embodiment of the present application;

[0032] Figure 6 A schematic diagram of the main structure of a rotary drying device provided in one embodiment of the present application;

[0033] Figure 7 A schematic diagram of the three-dimensional structure of a rotary drying device provided in one embodiment of the present application;

[0034] Figure 8 A schematic diagram of the internal cross-sectional structure of a rotating drum provided in one embodiment of the present application;

[0035] Fig. 9 A schematic diagram of the three-dimensional structure of a rotating drum provided in one embodiment of the present application;

[0036] Fig.10 A schematic diagram of the three-dimensional structure of an input bin provided in one embodiment of the present application.

[0037] Description of reference numerals:

[0038] 1. Crushing device; 2. Scraper transport device; 3. Drum drying device; 4. Hot air supply device; 10. Crushing device body; 11. First crushing chamber; 12. Stirring chamber; 13. Second crushing chamber; 21. Feed trough; 22. Steam heating bin; 23. Liquid collecting chamber; 31. Drum; 32. Input bin; 33. Output bin; 34. Gear ring; 35. Motor; 111. First crushing roller; 112. Crushing blades; 121. Stirring paddle; 131. Second crushing roller; 211. Upper return scraper chain; 212. Feed hopper; 213, discharge port; 214, air collecting bin; 215, axial flow fan; 221, deflector baffle; 222, porous plate; 311, inner cylinder; 312, outer cylinder; 321, hopper; 322, guide trough; 1111, first rotating shaft; 1311, second rotating shaft; 1312, cutting knife; 3101, sieve hole; 3111, inner cylinder copy board; 3112, flexible rope; 3113, grinding ball; 3121, outer cylinder copy board; 3201, exhaust port; 3301, discharge port; 3302, air inlet. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0040] like Figure 1 As shown, the present application provides a drying device, comprising a crushing device 1, a scraper conveying device 2 and a rotary drying device 3 connected in series in sequence;

[0041] The scraper conveyor 2 includes a conveying trough 21 and a steam heating chamber 22 disposed at the bottom of the conveying trough 21;

[0042] The rotary drying device 3 is also connected to the hot air supply device 4 ; the hot air output end of the rotary drying device 3 is connected to the input end of the heat exchange medium of the steam heating bin 22 .

[0043] In the present application, the steam heating bin 22 and the feed trough 21 are not connected, and heat is transferred between the two through the bottom of the feed trough 21 .

[0044] In the present application, the hot air input end of the steam heating bin 22 is close to the output end of the feed trough 21, and the hot air output end is close to the input end of the feed trough 21, so that the hot air can achieve countercurrent heat exchange with the wet material to improve the utilization efficiency of the energy in the hot air.

[0045] When the device of the present application is used, the filtered filter cake (such as the target product obtained in the synthesis reaction) is added to the crushing device 1 and crushed into filter cake agglomerates with smaller particle sizes.

[0046] The filter cake agglomerates obtained by the crushing device 1 fall into the feeding trough 21 of the scraper conveyor 2, and move to the output end of the feeding trough 21 under the scraping of the scraper in the feeding trough 21. At the same time, the hot air with residual heat output from the rotary drying device 3 enters the steam heating bin 22 to preheat the material in the feeding trough 21. The hot air in the steam heating bin 22 is heat exchanged and output from the exhaust port at the other end of the steam heating bin 22. The material preheated and transported by the scraper conveyor 2 is output from the output end of the feeding trough 21.

[0047] The preheated material output from the scraper conveyor 2 is input from one end of the rotary drying device 3 for drying. At the same time, the dry hot air supplied by the hot air supply device 4 is input from the other end of the rotary drying device 3 into the rotary drying device 3 for countercurrent contact with the wet material to carry out a mass transfer and heat transfer process to dry the material. The dried material is output from the material output end of the rotary drying device 3.

[0048] The moist hot air after heat exchange in the rotary drying device 3 is discharged from the hot air output end and enters the scraper conveyor device 2 for reuse.

[0049] The present application provides a drying device, which provides a steam heating bin 22 at the bottom of the scraper conveyor 2, and connects the hot air output end of the rotary drying device 3 to the steam heating bin 22, and inputs the hot air after the rotary drying device 3 dries the material into the steam heating bin 22 to preheat the wet material, so as to further utilize the waste heat in the hot air. The device of the present application reuses the heat in the hot air output by the rotary drying device 3 through the coordinated use of the above structure, thus overcoming the disadvantage of the traditional hot air drying device that it is difficult to fully utilize the heat when drying materials, resulting in energy waste.

[0050] like Figure 2 to Figure 4 As shown, optionally, the crushing device 1 includes a crushing device body 10, and the crushing device body 10 includes a first crushing chamber 11, a stirring chamber 12 and a second crushing chamber 13 in sequence from top to bottom;

[0051] A first crushing roller 111 is arranged in the first crushing chamber 11. The first crushing roller 111 includes a first rotating shaft 1111 and a plurality of crushing blades 112 arranged in an array on the periphery of the first rotating shaft 1111. The crushing blades 112 are arranged at a certain angle to the first rotating shaft 1111.

[0052] A stirring paddle 121 is arranged in the stirring chamber 12 along the horizontal direction;

[0053] A pair of second crushing rollers 131 are arranged in the second crushing chamber 13. The second crushing rollers 131 include a second rotating shaft 1311 and a plurality of cutting knives 1312 arranged in an array on the outer periphery of the second rotating shaft 1311. The cutting knives 1312 on the pair of second crushing rollers 131 are arranged to mesh with each other.

[0054] In this application, since the filter cakes obtained in production are mostly filter cakes obtained by pressure filtration or suction filtration, most of these filter cakes are in large blocks and have a relatively hard texture. Direct drying not only has a slow drying speed and wastes energy, but also causes agglomeration during the drying process, and finally obtains large blocks of hard materials, which will affect the subsequent packaging, continued reaction, etc. Therefore, the agglomerated wet materials must be broken before drying to overcome the above disadvantages.

[0055] When in use, the filtered filter cake (for example, the target product obtained in the synthesis reaction) is added to the crushing device 1, first enters the first crushing chamber 11 of the crushing device 1, and is crushed by the crushing blades 112 on the first crushing roller 111. The crushed filter cake falls into the stirring chamber 12, and is further crushed and stirred by the horizontally arranged stirring paddle 121. The filter cake after being crushed again falls into the second crushing chamber 13, and is sheared by the meshing cutting knives 1312 on a pair of second crushing rollers 131 in the second crushing chamber 13 to be crushed into filter cake agglomerates with smaller particle sizes.

[0056] like Figure 5 As shown, optionally, a return type scraper chain 211 is provided in the feeding trough 21;

[0057] A feed hopper 212 is disposed at one end of the conveying trough 21 , and a discharge port 213 is disposed at the other end; an air collecting bin 214 is disposed at the top of the conveying trough 21 , and an axial flow fan 215 is disposed in the air collecting bin 214 .

[0058] In the present application, since the wet material in the feed trough 21 will generate steam after heating, an air collecting bin 214 is set at the top of the feed trough 21, and an axial flow fan 215 is set in the air collecting bin 214, and the steam can be discharged through the axial flow fan 215 for processing or emission.

[0059] like Figure 5 As shown, optionally, a deflection baffle 221 is provided in the steam heating chamber 22 .

[0060] In the present application, a deflection baffle 221 is provided in the steam heating chamber 22, which can extend the travel distance of the hot air with residual heat so that the residual heat in the hot air can be fully utilized.

[0061] like Figure 5 As shown, optionally, a liquid collecting chamber 23 is provided at the bottom of the steam heating chamber 22 ; the steam heating chamber 22 and the liquid collecting chamber 23 are separated by a porous plate 222 .

[0062] In the present application, the hot air in the steam heating bin 22 moves along the path surrounded by the baffle plate 221, and the moisture in the hot air after heat exchange condenses into droplets through the porous plate 222 and falls into the liquid collecting chamber 23, and the hot air after heat exchange is discharged from the exhaust port at the other end of the steam heating bin 22. The material preheated and transported by the scraper conveyor 2 is discharged from the discharge port 213 of the conveying trough 21.

[0063] like Figure 6 and Figure 7 As shown, optionally, the rotary drying device 3 comprises: a rotary drum 31, an input bin 32 and an output bin 33 respectively arranged at two ends of the rotary drum 31;

[0064] A gear ring 34 is provided on the outer periphery of the rotating drum 31 , and meshes with a gear on the power output shaft of the motor 35 through the gear ring 34 .

[0065] In the present application, the drum 31 is the main structure for drying materials, and the wet materials are dried in the drum 31. The ring gear 34 is engaged with the gears to transmit the power output by the motor 35. The input bin 32 is the input end of the materials, and the output bin 33 is the output end of the materials, both of which are connected to the drum 31. The drum 31 is rotatably connected with the input bin 32 and the output bin 33.

[0066] like Figure 8 and Fig. 9 As shown, optionally, the rotating drum 31 includes an inner drum 311 and an outer drum 312 which are coaxially arranged; the inner drum 311 and the outer drum 312 are of equal length;

[0067] The inner cylinder 311 is provided with a plurality of sieve holes 3101; the inner wall of the inner cylinder 311 is provided with a plurality of inner cylinder shovel plates 3111 arranged along the length direction of the inner cylinder 311;

[0068] The inner wall of the inner cylinder 311 is also connected to a plurality of grinding balls 3113 via flexible ropes 3112;

[0069] The inner wall of the outer cylinder 312 is provided with a plurality of outer cylinder lifting plates 3121 in a spiral array along the length direction of the outer cylinder 312 .

[0070] In the present application, the inner cylinder 311 is fixedly connected to the outer cylinder 312 by a fixing device such as a connecting rib. The multiple outer cylinder shovels 3121 on the inner wall of the outer cylinder 312 are arranged in a spiral array along the length direction of the outer cylinder 312, so that the outer cylinder shovels 3121 can shovel the materials and transport the materials at the same time. The materials entering the inner cylinder 311 are shoveled along with the inner cylinder shovels 3111, and mass and heat transfer occurs with the hot air to take away the moisture in the materials. Since the materials will agglomerate during the drying process, the grinding balls 3113 connected to the inner cylinder 311 by the flexible rope 3112 play a role in grinding and crushing the block materials in the inner cylinder 311 during the rotation of the inner cylinder 311; since the inner cylinder 311 is provided with multiple sieve holes 3101, the materials smaller than the sieve holes 3101 fall into the outer cylinder 312 through the sieve holes, avoiding being over-crushed by the grinding balls 3113 in the inner cylinder 311. The flexible rope 3112 serves to constrain the grinding balls 3113 to prevent the grinding balls 3113 from being discharged along with the materials when the drum 31 is in use.

[0071] The inner cylinder 311 is connected to the input bin 32, and the outer cylinder 312 is connected to the output bin 33, so that the material enters the inner cylinder 311 from the input bin 32, then enters the outer cylinder 312, and enters the output bin 33 from the outer cylinder 312, thereby ensuring the drying effect of the material. In addition, a retaining ring can be provided at both ends of the inner cylinder 311 to prevent the material added to the inner cylinder 311 from falling into the outer cylinder 312 or the output bin 33 from both ends without being crushed; in general, it should be ensured that when in use, the material to be dried is input into the inner cylinder 311, and the dried material is output from the outer cylinder 312 to the output bin 33.

[0072] like Fig.10 As shown, optionally, a hopper 321 is provided on the top of the input bin 32, and the hopper 321 is communicated with a guide trough 322 provided inside the input bin 32; the output port of the guide trough 322 extends into the inner cylinder 311;

[0073] An exhaust port 3201 is provided on a side of the input bin 32 away from the drum 31;

[0074] like Figure 6 and Figure 7 As shown, a discharge port 3301 is provided at the bottom of the output bin 33 , and an air inlet 3302 is provided at a side of the output bin 33 away from the drum 31 , and the air inlet 3302 is connected to the hot air supply device 4 .

[0075] In the present application, when in use, the preheated material output from the discharge port 213 enters the hopper 321 on the input bin 32 of the rotary drying device 3, and is input into the inner drum 311 along the guide groove 322. At the same time, the motor 35 is turned on to drive the rotary drum 31 to rotate through the engagement of the gear and the ring gear 34, and the dry hot air from the hot air supply device 4 enters the rotary drum 31 from the air inlet 3302 opened on the output bin 33.

[0076] The material entering the inner cylinder 311 is scooped up by the inner cylinder scooping plate 3111, and mass and heat are transferred with the hot air to take away the moisture in the material. Since the material will agglomerate during the drying process, the grinding balls 3113 in the inner cylinder 311 connected by the flexible ropes 3112 grind and crush the block materials in the inner cylinder 311 as the inner cylinder 311 rotates. Since a plurality of sieve holes 3101 are provided on the inner cylinder 311, the material smaller than the sieve holes 3101 passes through the sieve holes and falls into the outer cylinder 312, thereby avoiding being over-crushed by the grinding balls 3113 in the inner cylinder 311.

[0077] As the outer cylinder 312 rotates, the material falling into the outer cylinder 312 is scooped up by the outer cylinder scooping plates 3121 on the inner wall of the outer cylinder 312 and exchanges heat with the hot air to achieve material drying. Since the outer cylinder scooping plates 3121 are arranged in a spiral array along the length direction of the outer cylinder 312 on the inner wall of the outer cylinder 312, during the rotation of the outer cylinder, the material will gradually move toward the output bin 33 along the spiral line formed by the outer cylinder scooping plates 3121 in the spiral array.

[0078] A drying device, the use process of which is as follows:

[0079] When in use, the filtered filter cake (for example, the target product obtained in the synthesis reaction) is added to the crushing device 1, first enters the first crushing chamber 11 of the crushing device 1, and is crushed by the crushing blades 112 on the first crushing roller 111. The crushed filter cake falls into the stirring chamber 12, and is further crushed and stirred by the horizontally arranged stirring paddle 121. The filter cake after being crushed again falls into the second crushing chamber 13, and is sheared by the meshing cutting knives 1312 on a pair of second crushing rollers 131 in the second crushing chamber 13 to be crushed into filter cake agglomerates with smaller particle sizes.

[0080] The filter cake agglomerates obtained by the crushing device 1 fall into the feed hopper 212 of the scraper conveyor 2, and then fall into the feed trough 21. Under the scraping of the scraper in the upper return scraper chain 211 in the feed trough 21, they move toward the output end of the feed trough 21. At the same time, the hot air with residual heat output from the rotary drying device 3 enters the steam heating bin 22 to preheat the material in the feed trough 21. At the same time, the axial flow fan 215 in the wind collecting bin 214 is turned on to suck out the steam generated by the heated material in the feed trough 21. The hot air in the steam heating bin 22 moves along the path surrounded by the baffle 221. The moisture in the hot air after heat exchange condenses into droplets, and falls into the liquid collecting chamber 23 through the porous plate 222. The hot air after heat exchange is output from the exhaust port at the other end of the steam heating bin 22. The material preheated and transported by the scraper conveyor 2 is output from the discharge port 213 of the feed trough 21.

[0081] The preheated material output from the discharge port 213 enters the hopper 321 on the input bin 32 of the rotary drum drying device 3, and is input into the inner drum 311 along the guide groove 322. At the same time, the motor 35 is turned on to drive the rotary drum 31 to rotate through the engagement of the gear and the ring gear 34, and the dry hot air from the hot air supply device 4 enters the rotary drum from the air inlet 3302 opened on the output bin 33.

[0082] The material entering the inner cylinder 311 is scooped up by the inner cylinder scooping plate 3111, and mass and heat are transferred with the hot air to take away the moisture in the material. Since the material will agglomerate during the drying process, the grinding balls 3113 in the inner cylinder 311 connected by the flexible ropes 3112 grind and crush the block materials in the inner cylinder 311 as the inner cylinder 311 rotates. Since a plurality of sieve holes 3101 are provided on the inner cylinder 311, the material smaller than the sieve holes 3101 passes through the sieve holes and falls into the outer cylinder 312, thereby avoiding being over-crushed by the grinding balls 3113 in the inner cylinder 311.

[0083] As the outer cylinder 312 rotates, the material falling into the outer cylinder 312 is scooped up by the outer cylinder scooping plates 3121 on the inner wall of the outer cylinder 312 for mass transfer and heat exchange with the hot air, thereby achieving material drying. Since the outer cylinder scooping plates 3121 are arranged in a spiral array along the length direction of the outer cylinder 312 on the inner wall of the outer cylinder 312, during the rotation of the outer cylinder, the material will gradually move toward the output bin 33 along the spiral line formed by the outer cylinder scooping plates 3121 in the spiral array. The dried material is output from the output port 3301 at the bottom of the output bin 33, and is stored or used for subsequent production after cooling.

[0084] The moist hot air after heat exchange in the drum 31 is discharged from the exhaust port 3201 opened on the input bin 32 and enters the steam heating bin 22 in the scraper conveyor 2 for reuse.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A drying device, characterized in that: It comprises a crushing device (1), a scraper transport device (2) and a rotary drying device (3) which are connected in series in sequence; The scraper conveyor (2) comprises a conveying trough (21) and a steam heating bin (22) arranged at the bottom of the conveying trough (21); The rotary drying device (3) is also connected to a hot air supply device (4), and the hot air output end of the rotary drying device (3) is connected to the input end of the heat exchange medium of the steam heating bin (22).

2. The drying device according to claim 1, characterized in that: The crushing device (1) comprises a crushing device body (10), wherein the crushing device body (10) comprises, from top to bottom, a first crushing chamber (11), a stirring chamber (12) and a second crushing chamber (13); A first crushing roller (111) is arranged in the first crushing chamber (11), the first crushing roller (111) comprising a first rotating shaft (1111) and a plurality of crushing blades (112) arranged in an array on the periphery of the first rotating shaft (1111), the crushing blades (112) being arranged at a certain angle to the first rotating shaft (1111); A stirring paddle (121) is arranged in the stirring chamber (12) along the horizontal direction; A pair of second crushing rollers (131) are arranged in the second crushing chamber (13), and the second crushing roller (131) comprises a second rotating shaft (1311) and a plurality of cutting knives (1312) arranged in an array on the outer periphery of the second rotating shaft (1311), and the cutting knives (1312) on the pair of second crushing rollers (131) are arranged to mesh with each other.

3. The drying device according to claim 1, characterized in that: An upward-returning scraper chain (211) is arranged in the feed trough (21); A feed hopper (212) is provided at one end of the feed trough (21), and a discharge port (213) is provided at the other end. An air collecting bin (214) is provided at the top of the feed trough (21), and an axial flow fan (215) is provided in the air collecting bin (214).

4. The drying device according to claim 1, characterized in that: A deflection baffle (221) is provided in the steam heating chamber (22).

5. The drying device according to claim 1, characterized in that: A liquid collecting chamber (23) is provided at the bottom of the steam heating chamber (22), and the steam heating chamber (22) and the liquid collecting chamber (23) are separated by a porous plate (222).

6. The drying device according to any one of claims 1 to 5, characterized in that: The rotary drum drying device (3) comprises: a rotary drum (31), an input bin (32) and an output bin (33) respectively arranged at two ends of the rotary drum (31); The outer periphery of the rotating drum (31) is provided with a gear ring (34), which meshes with a gear on a power output shaft of a motor (35) through the gear ring (34).

7. The drying device according to claim 6, characterized in that: The rotating cylinder (31) comprises an inner cylinder (311) and an outer cylinder (312) which are coaxially arranged, and the inner cylinder (311) and the outer cylinder (312) are of equal length; The inner cylinder (311) is provided with a plurality of sieve holes (3101) extending through it; the inner wall of the inner cylinder (311) is provided with a plurality of inner cylinder shovel plates (3111) arranged in an array along the length direction of the inner cylinder (311); The inner wall of the inner cylinder (311) is also connected to a plurality of grinding balls (3113) via a flexible rope (3112); The inner wall of the outer cylinder (312) is provided with a plurality of outer cylinder lifting plates (3121) in a spiral array along the length direction of the outer cylinder (312).

8. The drying device according to claim 7, characterized in that: A hopper (321) is provided on the top of the input bin (32), the hopper (321) is communicated with a material guide trough (322) provided inside the input bin (32), and an output port of the material guide trough (322) extends into the inner cylinder (311); An exhaust port (3201) is provided on a side of the input bin (32) away from the rotating drum (31); The bottom of the output bin (33) is provided with a discharge port (3301), and a side of the output bin (33) away from the rotating drum (31) is provided with an air inlet (3302), and the air inlet (3302) is connected to the hot air supply device (4).

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