Polymer drying machine

Abstract

The utility model discloses a macromolecule drying machine which is characterized in that an electric heating wire is wound on the outer side of a drying cylinder, and balls are arranged in the drying cylinder; the side wall of the scraping rod is slidably attached to the inner side wall of the drying cylinder, a first driver is arranged at one end of the drying cylinder, and the scraping rod is fixed to an output rotating shaft of the first driver. An output rotating shaft of the driver I is connected with a rope body, and a ball body is fixed on the rope body; a rotating shaft I and a rotating shaft II are fixed on the drying cylinder; a second driver is fixed to the first support, and an output rotating shaft of the second driver is fixed to the first rotating shaft. And a second rotating shaft is rotationally supported on the second support, is hollow and is provided with two open ends, and the second rotating shaft communicates with the interior of the drying cylinder. The electric heating wire can uniformly heat materials in the drying cylinder; caked materials in the drying cylinder can be scattered by the balls in time, so that the drying effect is improved; and when the scraping rods rotate, materials adhered to the inner side wall of the drying cylinder can be scraped away.

Description

Technical Field

[0001] The utility model relates to the field of drying equipment, and more specifically to a polymer drying machine. Background Art

[0002] The polymer dryer can dry polymer materials, such as polymer resin particles. The existing double-cone dryer does not have anti-caking and cleaning components designed inside the body. For example, during the drying process of polymer resin particles, their viscosity will change with temperature and dryness and wetness. The polymer resin particles are easy to stick together into blocks and will also be attached to the inner wall of the drying cylinder. As the drying cylinder turns over, the polymer resin particles become larger and larger, and more and more materials adhere to the inner wall of the drying cylinder. The above will cause uneven heating of the polymer resin particles inside the drying cylinder, affecting the drying effect. At the same time, the drying time will also increase, and the material adhered to the inner wall of the drying cylinder is not easy to clean, which will affect the discharge over time.

[0003] Therefore, how to provide a polymer dryer that can overcome the above problems is a problem that those skilled in the art need to solve urgently. Utility Model Content

[0004] In view of this, the utility model provides a polymer dryer.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A polymer dryer, comprising:

[0007] A drying cylinder, wherein the drying cylinder is a rotating body and has two openings at both ends, one open end of the drying cylinder is detachably sealed with a cover, an outer wall of the drying cylinder is tightly wound with a heating wire, and a plurality of spheres are arranged inside the drying cylinder;

[0008] A wall scraper, the wall scraper comprises a scraper rod, a casing and a driving machine 1, the scraper rod is arranged in the drying cylinder, the side wall of the scraper rod slides tightly against the inner wall of the drying cylinder, one end of the casing is open, the open end of the casing is sealed and fixed to an open end of the drying cylinder away from the cover body, the driving machine 1 is fixed in the casing, the output shaft of the driving machine 1 coincides with the center line of the drying cylinder, one end of the scraper rod is fixed to the output shaft of the driving machine 1, and the other end of the scraper rod is flush with the inner wall of the end of the drying cylinder away from the driving machine 1; a rope body is connected to the output shaft of the driving machine 1, and the ball is fixed on the rope body;

[0009] The frame comprises a bracket 1 and a bracket 2 which are both arranged vertically, a coaxial rotating shaft 1 and a coaxial rotating shaft 2 are fixed on the side wall of the drying cylinder, the axis line of the rotating shaft 1 coincides with and is perpendicular to the center line of the drying cylinder; the rotating shaft 1 is horizontally rotatably supported on the bracket 1, a driving machine 2 is fixed on the bracket 1, and the output rotating shaft of the driving machine 2 is coaxially fixed with the rotating shaft; the rotating shaft 2 is rotatably supported on the bracket 2, the rotating shaft 2 is hollow inside and open at both ends, and a ventilation through hole connected to the rotating shaft 2 is opened on the cylinder wall of the drying cylinder.

[0010] It can be known from the above technical scheme that compared with the prior art, the utility model discloses a polymer dryer. The utility model winds an electric heating wire on the outer wall of the drying cylinder. The electric heating wire can heat the drying cylinder and the material inside the drying cylinder, which helps to improve the drying speed. At the same time, the electric heating wire heats evenly, and the material in the drying cylinder can be evenly heated. A sphere is arranged inside the drying cylinder. When the material inside the drying cylinder rolls, due to the design of the sphere, the agglomerated material can be promptly dispersed by the sphere, thereby improving the drying effect. By designing a wall scraper, a driving machine 1 in the wall scraper can drive the scraper rod to rotate, and the side wall of the scraper rod slides tightly against the inner wall of the drying cylinder. Therefore, when the scraper rod rotates, the material adhered to the inner wall of the drying cylinder can be scraped off, further improving the drying effect. The frame can reliably support the rotation of the drying cylinder. The drying cylinder is connected to the outside through a second rotating shaft. The water vapor generated by the material during the drying process can be discharged to the outside of the drying cylinder through the second rotating shaft.

[0011] Preferably, it also includes a vacuum pump, which includes a vacuum pump and a condenser. The end of the second rotating shaft away from the drying cylinder is connected to the air extraction end of the vacuum pump, and the condenser is connected in series in the air path between the two. When the drying cylinder is drying the material, a certain vacuum degree can be maintained inside the drying cylinder. This design can greatly increase the drying speed of the material.

[0012] Preferably, a filter head is tightly embedded in the air-permeable through hole, the filter head comprises a tube body and a filter screen, the tube body is tightly embedded in the air-permeable through hole, and one end of the tube body is covered with the filter screen. The material in the drying cylinder will not leak out from the second rotating shaft.

[0013] Preferably, the wall scraper also includes a coaxially arranged connection disk and a circular ring, the connection disk is coaxially fixed with the output shaft of the driving machine 1, a plurality of scraper rods are provided and are evenly arranged along the circumference of the drying cylinder, one end of the plurality of scraper rods are fixed to the connection disk, and the other ends of the plurality of scraper rods are fixed to the circular ring, an annular groove is provided on the inner wall of the open end of the drying cylinder away from the driving machine 1, the circular ring is slidably and tightly embedded in the annular groove, and an open end of the drying cylinder away from the driving machine 1 is located inside the circular ring; one end of the rope body is fixed to a side of the connection disk away from the driving machine 1, and the other end of the rope body is fixed to the circular ring, the sphere is arranged between the two ends of the rope body, a plurality of the spheres are provided and are arranged equidistantly in sequence along the length direction of the rope body, and the spheres can abut against the inner wall of the drying cylinder. Both the scraper rod and the sphere can be stably arranged in the drying cylinder.

[0014] Preferably, a hole is opened on the wall of the drying cylinder and a temperature sensor is tightly embedded therein, and the temperature sensor, the heating wire, the first driver and the second driver are all electrically connected to an external control device. The temperature inside the drying cylinder can be monitored in real time.

[0015] Preferably, a cover is provided on the outer wall sealing buckle of the drying cylinder, and the heating wire is arranged in the cover. The cover can protect the heating wire and also has the function of heat preservation and heat insulation.

[0016] Preferably, the end of the second rotating shaft away from the drying cylinder is fixed to and communicated with the rotating air inlet end of the rotary valve, the fixed end of the rotary valve is fixed to the second bracket, and the fixed air outlet end of the rotary valve is communicated with the inlet of the condenser. The second rotating shaft can also achieve reliable air path communication with the vacuum pump when rotating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 It is an overall axonometric view of a polymer dryer;

[0019] Figure 2 A partial axonometric view of a polymer dryer Figure 1 ;

[0020] Figure 3 It is a cross-sectional schematic diagram of a polymer dryer;

[0021] Figure 4 A partial axonometric view of a polymer dryer Figure 2 ;

[0022] Figure 5 A partial axonometric view of a polymer dryer Figure 3 .

[0023] In the figure:

[0024] 1 is a drying cylinder, 2 is a cover, 3 is a heating wire, 4 is a sphere, 5 is a scraper, 6 is a casing, 7 is a driving machine 1, 8 is a rope body, 9 is a bracket 1, 10 is a bracket 2, 11 is a rotating shaft 1, 12 is a rotating shaft 2, 13 is a driving machine 2, 14 is a vacuum pump, 15 is a condenser, 16 is a tube body, 17 is a filter screen, 18 is a connecting plate, 19 is a ring, 20 is an annular groove, 21 is a temperature sensor, 22 is a cover body, and 23 is a rotary valve. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The utility model discloses a polymer dryer. The utility model winds an electric heating wire 3 on the outer wall of the drying cylinder 1. The electric heating wire 3 can heat the drying cylinder 1 and the polymer resin particles located inside the drying cylinder 1, which is helpful to improve the drying speed. At the same time, the electric heating wire 3 heats evenly, and the polymer resin particles in the drying cylinder 1 can be evenly heated. A sphere 4 is arranged inside the drying cylinder 1. When the polymer resin particles inside the drying cylinder 1 roll, due to the design of the sphere 4, the agglomerated polymer resin particles can be promptly dispersed by the sphere 4, thereby improving the drying effect. By designing a wall scraper, a driving machine 7 in the wall scraper can drive a scraper rod 5 to rotate, and the side wall of the scraper rod 5 slides and closely contacts with the inner wall of the drying cylinder 1. Therefore, when the scraper rod 5 rotates, the polymer resin particles adhered to the inner wall of the drying cylinder 1 can be scraped off, thereby further improving the drying effect. By designing a rope body 8, the rope body 8 can limit the sphere 4. When the drying cylinder 1 is discharging materials, the sphere 4 will not fall out of the drying cylinder 1. The frame can The drying cylinder 1 can be reliably supported for rotation. The drying cylinder 1 is connected to the outside through the rotating shaft 12. The water vapor generated by the polymer resin particles during the drying process can be discharged to the outside of the drying cylinder 1 through the rotating shaft 12; by designing a vacuum pump, the inside of the drying cylinder 1 can maintain a certain vacuum degree when the polymer resin particles are drying. This design can greatly improve the drying speed of the polymer resin particles; by designing a filter head, the polymer resin particles in the drying cylinder 1 will not leak out through the rotating shaft 12, and the polymer resin particles will not block the rotating shaft 12; by designing a connecting disk 18 and a ring 19, the scraper 5 can be stably arranged in the drying cylinder 1, and at the same time, the driving machine 7 can reliably drive the scraper 5 to rotate; by designing a temperature sensor 21, the temperature in the drying cylinder 1 can be monitored in real time; by designing a cover 22, the cover 22 can play a role in heat insulation and protection, reduce the heat loss of the drying cylinder 1, and ensure that the heating wire 3 will not be damaged by external objects.

[0027] Example

[0028] See attached Figure 1-5 The utility model is a schematic diagram of the overall and partial structures of an embodiment of the utility model. The utility model specifically discloses a polymer dryer, including:

[0029] The drying cylinder 1 is a rotating body component. The outer contour of the drying cylinder 1 is a combination of a cylinder and two cones. Both ends of the drying cylinder 1 are open. One open end of the drying cylinder 1 is detachably blocked with a cover 2. The cover 2 can be opened to realize the feeding and unloading of the drying cylinder 1. The outer wall of the drying cylinder 1 is tightly wound with multiple turns of electric heating wire 3. The electric heating wire 3 can be one arranged in a spiral shape, or multiple electric heating wires 3 can be arranged in a ring shape. In the second case, multiple electric heating wires 3 are also connected in series end to end. The electric heating wire 3 can heat the drying cylinder 1 after being energized; multiple spheres 4 are arranged inside the drying cylinder 1. When the drying cylinder 1 is turned over, the spheres 4 are mixed and collided with the materials in the drying cylinder 1, so that the materials in the drying cylinder 1 will not agglomerate, which helps to increase the drying speed;

[0030] A wall scraper, which includes a scraper rod 5, a casing 6 and a driving machine 7. The scraper rod 5 with a rectangular cross-section is arranged in the drying cylinder 1. The side wall of the scraper rod 5 slides tightly against the inner wall of the drying cylinder 1. One end of the cylindrical casing 6 is open. The open end of the casing 6 is sealed and fixed to an open end of the drying cylinder 1 away from the cover body 2 by bolt connection. A driving machine 7 is fixed in the casing 6. The output shaft of the driving machine 7 coincides with the center line of the drying cylinder 1. One end of the scraper rod 5 is fixed to the output shaft of the driving machine 7. The other end of the scraper rod 5 is flush with the inner wall of the end of the drying cylinder 1 away from the driving machine 7. The driving machine 7 drives the scraper rod 5 to rotate. When the scraper rod 5 rotates, it cleans the materials adhering to the inner wall of the drying cylinder 1.

[0031] A rope body 8 is connected to the output shaft of the driving machine 7, and a ball 4 is fixed on the rope body 8. The rope body 8 is made of high temperature resistant and wear-resistant materials. The rope body 8 in this embodiment is a steel wire rope. The ball 4 in this embodiment is a steel ball. There are multiple steel balls to ensure that the steel balls can fully contact and mix with the materials in the drying cylinder 1 to improve the crushing effect of the agglomerated materials. The design purpose of the rope body 8 is: when the drying cylinder 1 is arranged vertically and the cover body 2 is located below the drying cylinder 1, the cover body 2 is opened to discharge the material, and the ball 4 will not fall out of the drying cylinder 1, so as to avoid the adhesion of external impurities on the surface of the ball 4 and also avoid the loss of the ball 4;

[0032] The frame includes a bracket 1 9 and a bracket 2 10 which are both arranged vertically, and the outer contours of the bracket 1 9 and the bracket 2 10 are both isosceles triangles. A coaxial rotating shaft 11 and a coaxial rotating shaft 12 are fixed on the side wall of the drying cylinder 1, and the axis of the rotating shaft 11 coincides with the center line of the drying cylinder 1 and is perpendicular to the center line of the drying cylinder 1;

[0033] A rotating shaft 11 is supported on a bracket 9 for horizontal rotation. A driving machine 2 13 is fixed on the bracket 9. The output rotating shaft of the driving machine 2 13 is coaxially fixed with the rotating shaft 11. The driving machine 2 13 can drive the drying cylinder 1 to turn around the axis of the rotating shaft 11. During the turning process of the drying cylinder 1, the material inside the drying cylinder 1 will roll and be dried.

[0034] A second rotating shaft 12 is rotatably supported on the second bracket 10. The second rotating shaft 12 is hollow inside and open at both ends. A ventilation hole connected to the second rotating shaft 12 is opened on the wall of the drying cylinder 1. Water vapor generated by the material in the drying cylinder 1 during the drying process will be discharged through the ventilation hole.

[0035] More specifically, it also includes a vacuum pump, which includes a vacuum pump 14 and a condenser 15. The end of the rotating shaft 12 away from the drying cylinder 1 is connected to the exhaust end of the vacuum pump 14, and the condenser 15 is connected in series in the gas path between the two. During the drying process of the material, the vacuum pump 14 can extract the gas in the drying cylinder 1 so that a certain vacuum degree is maintained in the drying cylinder 1. This design can greatly increase the drying speed of the material. The gas extracted from the drying cylinder 1 contains moisture, and the condenser 15 can capture the above moisture to prevent water vapor from entering the vacuum pump 14 and causing damage to the vacuum pump 14.

[0036] A filter head is tightly embedded in the air permeable hole, and the filter head includes a tube body 16 and a circular filter screen 17. The tube body 16 is tightly embedded in the air permeable hole, and one end of the tube body 16 is covered with the filter screen 17. The mesh size of the filter screen 17 is smaller than the minimum particle size of the material, ensuring that the material will not enter the rotating shaft 12 during the drying process.

[0037] To be more specific, the scraper also includes a coaxially arranged connecting disk 18 and a circular ring 19. The circular connecting disk 18 is coaxially fixed with the output rotating shaft of the driving machine 7. The connecting disk 18 is arranged in the drying cylinder 1. A plurality of scraper rods 5 are provided and are evenly arranged along the circumference of the drying cylinder 1. In this embodiment, three scraper rods 5 are provided, one end of each of the scraper rods 5 is fixed to the connecting disk 18, and the other end of each of the scraper rods 5 is fixed to the circular ring 19. An annular groove 20 is provided on the inner wall of the open end of the drying cylinder 1 away from the driving machine 7. The circular ring 19 is slidably and tightly embedded in the annular groove 20. An open end of the drying cylinder 1 away from the driving machine 7 is located on the inner side of the circular ring 19. The design of the connecting disk 18 and the circular ring 19 ensures that the plurality of scraper rods 5 can be stably arranged in the drying cylinder 1, and at the same time, ensures that the driving machine 7 can reliably drive the scraper rod 5 to rotate.

[0038] One end of the rope body 8 is fixed to a side of the connecting disk 18 away from the driving machine 7, and the other end of the rope body 8 is fixed to the ring 19. A plurality of spheres 4 are arranged between the two ends of the rope body 8. The plurality of spheres 4 are arranged in sequence and equidistantly along the length direction of the rope body 8. The length of the rope body 8 is greater than the length of the drying cylinder 1, so that the spheres 4 can abut against the inner wall of the drying cylinder 1.

[0039] A hole is opened on the wall of the drying cylinder 1 and a temperature sensor 21 is tightly embedded therein. The temperature sensor 21 can monitor the internal temperature of the drying cylinder 1 in real time. The temperature sensor 21, the heating wire 3, the driving machine 1 7 and the driving machine 2 13 are all electrically connected to an external control device, which can control the heating wire 3, the driving machine 1 7 and the driving machine 2 13.

[0040] A cover 22 is provided on the outer wall sealing buckle of the drying cylinder 1, and the heating wire 3 is arranged in the cover 22. The cover 22 can play the role of heat insulation and protection, reduce the heat loss of the drying cylinder 1, and at the same time, external objects will not cause bumps and damage to the heating wire 3.

[0041] One end of the rotating shaft 12 away from the drying cylinder 1 is fixed to and connected with the rotating air inlet end of the rotary valve 23, the fixed end of the rotary valve 23 is fixed to the bracket 10, and the fixed air outlet end of the rotary valve 23 is connected with the inlet of the condenser 15. By designing the rotary valve 23, the rotating shaft 12 can also be reliably connected with the vacuum pump 14 in the air path when rotating.

[0042] When the dryer is in use, firstly, the driving machine 13 is used to drive the drying cylinder 1 to flip, so that the drying cylinder 1 is arranged vertically, and the cover 2 is located above the drying cylinder 1, the cover 2 is opened and the polymer resin particles to be dried are added into the drying cylinder 1, and the cover 2 is installed after the filling is completed; secondly, the driving machine 13 starts to drive the drying cylinder 1 to flip, and at the same time, the heating wire 3 and the vacuum pump 14 start to work, the heating wire 3 heats the polymer resin particles in the drying cylinder 1, and the water vapor generated by the polymer resin particles in the drying cylinder 1 during the drying process will be extracted by the vacuum pump 14; when the polymer resin particles are dried, the driving machine 13 drives the drying cylinder 1 to flip, so that the drying cylinder 1 is arranged vertically, and the cover 2 is located below the drying cylinder 1, and the cover 2 can be opened to collect the dried polymer resin particles.

[0043] During the drying process, the temperature sensor 21 can monitor the temperature inside the drying cylinder 1 in real time; due to the design of the sphere 4, the sphere 4 can break up the agglomerated polymer resin particles; due to the design of the driving machine 7 and the scraper 5, during the drying process or when discharging, the driving machine 7 drives the scraper 5 to rotate, and the scraper 5 can scrape off the polymer resin particles adhering to the inner wall of the drying cylinder 1.

[0044] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A polymer dryer, characterized in that: include: A drying cylinder (1), the drying cylinder (1) being a rotating body with two openings at both ends, one open end of the drying cylinder (1) being detachably sealed with a cover (2), an outer wall of the drying cylinder (1) being tightly wound with an electric heating wire (3), and a plurality of spheres (4) being arranged inside the drying cylinder (1); A wall scraper, the wall scraper comprising a scraper rod (5), a casing (6) and a driving machine (7); the scraper rod (5) is arranged in the drying cylinder (1); the side wall of the scraper rod (5) is slidably attached to the inner wall of the drying cylinder (1); one end of the casing (6) is open; the open end of the casing (6) is sealed and fixed to an open end of the drying cylinder (1) away from the cover body (2); the driving machine (7) is fixed in the casing (6); the output shaft of the driving machine (7) coincides with the center line of the drying cylinder (1); one end of the scraper rod (5) is fixed to the output shaft of the driving machine (7); the other end of the scraper rod (5) is flush with the inner wall of the end of the drying cylinder (1) away from the driving machine (7); a rope body (8) is connected to the output shaft of the driving machine (7); the ball (4) is fixed to the rope body (8); A frame, the frame comprising a bracket 1 (9) and a bracket 2 (10) both arranged vertically, a coaxial rotating shaft 1 (11) and a coaxial rotating shaft 2 (12) being fixed on the side wall of the drying cylinder (1), the axis of the rotating shaft 1 (11) being coincident with and perpendicular to the center line of the drying cylinder (1); the rotating shaft 1 (11) being horizontally rotatably supported on the bracket 1 (9), a driving machine 2 (13) being fixed on the bracket 1 (9), the output rotating shaft of the driving machine 2 (13) being coaxially fixed with the rotating shaft 1 (11); the rotating shaft 2 (12) being rotatably supported on the bracket 2 (10), the rotating shaft 2 (12) being hollow inside and open at both ends, and a ventilation through hole communicating with the rotating shaft 2 (12) being opened on the cylinder wall of the drying cylinder (1).

2. A polymer dryer according to claim 1, characterized in that: It also includes a vacuum pump, which includes a vacuum pump (14) and a condenser (15). The end of the second rotating shaft (12) away from the drying cylinder (1) is connected to the suction end of the vacuum pump (14), and the condenser (15) is connected in series in the gas path between the two.

3. A polymer dryer according to claim 2, characterized in that: A filter head is tightly embedded in the air-permeable through hole, and the filter head comprises a tube body (16) and a filter screen (17). The tube body (16) is tightly embedded in the air-permeable through hole, and one end of the tube body (16) is covered with the filter screen (17).

4. A polymer dryer according to claim 1, characterized in that: The wall scraper also includes a coaxially arranged connection disk (18) and a circular ring (19), wherein the connection disk (18) is coaxially fixed to the output shaft of the driving machine (7), a plurality of scraper rods (5) are provided and are evenly arranged along the circumference of the drying cylinder (1), one end of each of the scraper rods (5) is fixed to the connection disk (18), and the other end of each of the scraper rods (5) is fixed to the circular ring (19), and an annular groove (20) is provided on the inner wall of the open end of the drying cylinder (1) away from the driving machine (7), and the circular ring (19) is slidably and tightly embedded in the drying cylinder (1). In the annular groove (20), an open end of the drying cylinder (1) away from the driving machine (7) is located on the inner side of the circular ring (19); one end of the rope body (8) is fixed to a disk surface of the connecting disk (18) away from the driving machine (7), and the other end of the rope body (8) is fixed to the circular ring (19); the sphere (4) is arranged between the two ends of the rope body (8); a plurality of spheres (4) are provided and are arranged equidistantly in sequence along the length direction of the rope body (8); and the spheres (4) can abut against the inner wall of the drying cylinder (1).

5. A polymer dryer according to claim 1, characterized in that: The wall of the drying cylinder (1) is provided with a hole and a temperature sensor (21) is tightly embedded therein. The temperature sensor (21), the heating wire (3), the first driving machine (7) and the second driving machine (13) are all electrically connected to an external control device.

6. A polymer dryer according to claim 1, characterized in that: A cover body (22) is provided on the outer wall sealing buckle of the drying cylinder (1), and the heating wire (3) is arranged in the cover body (22).

7. A polymer dryer according to claim 2, characterized in that: One end of the second rotating shaft (12) away from the drying cylinder (1) is fixed to and communicated with the rotating air inlet end of the rotary valve (23), the fixed end of the rotary valve (23) is fixed to the second bracket (10), and the fixed air outlet end of the rotary valve (23) is communicated with the inlet of the condenser (15).

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