CN113047014A

CN113047014A - Circulating type double-layer dryer and drying method thereof

Info

Publication number: CN113047014A
Application number: CN202110333946.XA
Authority: CN
Inventors: 潘俊剑
Original assignee: Zhejiang Blue Whale Intelligent Equipment Manufacturing Co ltd
Current assignee: Zhejiang Blue Whale Intelligent Equipment Manufacturing Co ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-06-29
Anticipated expiration: 2041-03-29
Also published as: CN113047014B

Abstract

The invention relates to the technical field of clothes drying, in particular to a circulating type double-layer dryer and a drying method thereof. The drying mechanism designed by the invention comprises the rotary drum, the extracting rod and the rotating nut, and the extracting rod can rotate along with the rotary drum and move outwards through the matching of the lead screw and the nut after clothes are dried, so that the clothes can be automatically extracted, and workers are prevented from directly contacting high-temperature clothes. The first air collecting groove and the second air collecting groove are matched with the exhaust fan and the screen, so that the wet air passing through the roller can directly enter the air outlet pipe, and the wet air is prevented from being retained in the drying box to reduce the drying effect. The hot air circulation mechanism and the heat pump heating mechanism are matched, so that air can circulate in the device, and the heat pump is used for absorbing waste heat of a factory to heat the air, so that the energy consumption of the dryer is reduced, the energy utilization rate is improved, and the dryer is more energy-saving and environment-friendly.

Description

Circulating type double-layer dryer and drying method thereof

Technical Field

The invention relates to the technical field of clothes drying, in particular to a circulating type double-layer dryer and a drying method thereof.

Background

The dryer is a machine for quickly drying washed clothes, the high temperature in the drying box can also effectively play a role in sterilization and disinfection while the clothes are dried, the application and development of the home, industry and commercial dryers are greatly developed when the fast pace and health are pursued at present, and particularly for factories, the dryer can quickly dry the tools of workers, so that the factory efficiency is improved. Because the temperature in the drying box can reach more than fifty degrees when the dryer works, and the drum dryer can rotate the clothes, the clothes can be prevented from being damaged by the high-temperature air contacting the same position of the clothes for a long time. However, the existing factory-used drying machine still needs workers to manually take out clothes in the drying box after drying, the clothes are easily scalded after long-term operation, hot air circulation in the drying box is not fast enough, and humid air is easily retained in the drying box, so that the drying effect is affected. Meanwhile, heating the hot air to over fifty degrees consumes a large amount of energy, and the energy consumption is serious.

Disclosure of Invention

In view of the above-mentioned shortcomings, the present invention provides a circulation type dual-layer dryer and a drying method thereof.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a circulating double-deck drying-machine, the device includes frame, stoving mechanism, heated air circulation mechanism and heat pump heating mechanism, the frame includes the stoving case, and the stoving case is opened there is the inner chamber, and stoving incasement portion installs stoving mechanism, and stoving case side rear is provided with heated air circulation mechanism, and heated air circulation mechanism right side is provided with heat pump heating mechanism.

Furthermore, a first air outlet is formed in the top of the inner cavity of the drying box, a first air collecting port is arranged on one side, close to the inner cavity, of the first air outlet, an air inlet is formed below the first air collecting port, a second through hole is formed below the second through hole, a second air outlet is formed below the second through hole, a second air collecting port is formed in the bottom of the inner cavity, a second air collecting groove is formed in the second air collecting port, the second air collecting groove is communicated with the second air outlet, a closed door is arranged in front of the drying box, two first fixing blocks which are distributed in parallel are arranged on the outer surface, close to the closed door, of the right side of the drying box, through holes are formed in the first fixing blocks, two positioning holes which are distributed symmetrically are formed in the side, far away from the closed door, of the first fixing blocks, two second positioning blocks which are distributed in parallel are arranged in the position, close to the closed door, of the left side of the inner cavity, the two second positioning blocks and the two first fixing blocks are the same in height, and a monitoring panel is arranged on the outer surface of the left side of the drying box close to the closed door.

Further, stoving mechanism is including setting up the hot air blast main at the inner chamber, both sides all are provided with linear distribution's hot air spout about the hot air blast main, hot air blast main top and below symmetric distribution have two cylinders, be provided with in the cylinder and draw the pole, it includes the board of drawing near the cylinder bottom to draw the pole, draw the guide slot that the board edge opened has two symmetric distribution, it is fixed with the lead screw to draw the board middle part, the end of lead screw is opened there is the chamfer, first fixed block is provided with swivel nut, one side that the sealing door was kept away from to the stoving case is provided with two parallel distribution's motor, the motor below is provided with the mounting panel, the mounting panel sets up on the stoving case.

Furthermore, a plurality of drying holes are formed in the cylindrical surface of the roller, two sliding rails which are symmetrically distributed are arranged on the inner side of the roller, check rings are arranged at the tail ends of the sliding rails, and the sliding rails are matched with the guide grooves.

Further, the one end that the swivel nut is close to first fixed block is provided with the pivot, pivot and through-hole cooperation, and the pivot can be at through-hole internal rotation and slip, and the swivel nut middle part is provided with the nut, and the nut is close to one side of lead screw and opens there is the chamfer, nut and lead screw cooperation, and the pivot end is provided with the fixed plate, and one side that the fixed plate is close to first fixed block is provided with the locating lever of two symmetric distributions, locating lever and locating hole cooperation.

Further, heated air circulation mechanism is including setting up the condensation drying cabinet in stoving case side, condensation drying cabinet top intercommunication has first play tuber pipe, the first air outlet of condensation drying cabinet's one end intercommunication is kept away from to first play tuber pipe, condensation drying cabinet below intercommunication has the second to go out the tuber pipe, the second goes out the tuber pipe and keeps away from the one end intercommunication second air outlet of condensation drying cabinet, condensation drying cabinet side is provided with the heating cabinet, heating cabinet and condensation drying cabinet intercommunication, one side intercommunication that condensation drying cabinet was kept away from to the heating cabinet has the air-supply line, the air-supply line is close to the one end intercommunication air intake of stoving case.

Furthermore, the one end that first tuber pipe and stoving case contact is provided with the exhaust fan, and one side that the exhaust fan is close to first air outlet is provided with the screen cloth, and the one end structure that the second goes out tuber pipe and stoving case contact is the same with first tuber pipe.

Furthermore, the heat pump heating mechanism comprises a heating box, one side of the heating box, which is far away from the drying box, is provided with a heat absorption box, the heat absorption box is communicated with the residual heat pipes in a factory, and a first heat exchange pipe and a second heat exchange pipe are arranged between the heat absorption box and the heating box.

Further, the drying method of the circulating type double-layer dryer comprises the following steps:

s1, after clothes are put into the roller, the sealing door is closed, and the motor is driven by the monitoring panel to drive the roller to rotate;

s2, spraying hot air by a hot air nozzle to dry the clothes in the drum;

s3, allowing hot air containing a large amount of water vapor to directly enter a first air outlet pipe and a second air outlet pipe under the assistance of a first air collecting groove, a second air collecting groove and an exhaust fan;

s4, enabling hot air containing a large amount of water vapor to enter a condensation drying box through a first air outlet pipe and a second air outlet pipe, and enabling the water vapor to be condensed and become dry cold air;

s5, enabling the dry cold air to enter a heating box, heating the dry cold air into dry hot air by a heat pump heating mechanism, and enabling the dry hot air to enter a hot air nozzle through an air inlet pipe to realize circulating drying;

s6, monitoring that the humidity in the drying box is reduced to a preset value by a monitoring panel to remind a worker to carry out the next operation;

s7, opening the closing door, sliding the positioning rod of the rotating nut out of the positioning hole, enabling the nut to be matched with the lead screw, and fixing the rotating nut under the action of the first fixing block and the second positioning block;

s8, controlling the drum to rotate by the monitoring panel, and taking out the clothes in the drum by the extraction rod sliding outwards along the slide rail under the matching of the lead screw and the nut while rotating along with the drum;

s9, after the clothes are taken out, the motor is controlled by the monitoring panel to rotate reversely, the extracting rod returns to the original position, the rotating nut slides outwards along the through hole at the moment, the rotating nut is reset after the nut and the lead screw are separated, and the clothes are filled into the drum for next drying.

The invention has the beneficial effects that:

1. the drying mechanism designed by the invention comprises the rotary drum, the extracting rod and the rotating nut, and the extracting rod can rotate along with the rotary drum and move outwards through the matching of the lead screw and the nut after clothes are dried, so that the clothes can be automatically extracted, and workers are prevented from directly contacting high-temperature clothes.

2. The first air collecting groove and the second air collecting groove are matched with the exhaust fan and the screen, so that the wet air passing through the roller can directly enter the air outlet pipe, and the wet air is prevented from being retained in the drying box to reduce the drying effect.

3. The hot air circulation mechanism and the heat pump heating mechanism are matched, so that air can circulate in the device, and the heat pump is used for absorbing waste heat of a factory to heat the air, so that the energy consumption of the dryer is reduced, the energy utilization rate is improved, and the dryer is more energy-saving and environment-friendly.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts;

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the frame structure of the present invention;

FIG. 3 is a schematic view of the drying mechanism of the present invention;

FIG. 4 is a schematic cross-sectional view of the drying mechanism of the present invention;

FIG. 5 is a schematic view of the structure of the extraction rod;

FIG. 6 is a schematic view of the structure of the drum;

FIG. 7 is a schematic view of a rotational structure of the rotating nut;

FIG. 8 is a schematic view of a hot air circulation structure of the present invention;

fig. 9 is an exploded view of the first outlet duct of the present invention;

FIG. 10 is a schematic view of the heat pump heating mechanism of the present invention;

fig. 11 is a schematic view of the present invention when performing a drying operation.

The reference numbers in the figures illustrate:

1. a frame; 11. a drying box; 111. an inner cavity; 112. a first air outlet; 113. a first through hole; 114. an air inlet; 115. a second through hole; 116. a second air outlet; 12. a closing door; 13. a first air collecting opening; 131. a first air collecting groove; 14. a second air collecting opening; 141. a second air collecting groove; 15. a first fixed block; 151. a through hole; 152. positioning holes; 16. a second fixed block; 17. a monitoring panel; 2. a drying mechanism; 21. a drum; 211. drying the holes; 212. a guide rail; 213. a retainer ring; 22. extracting the stems; 221. an extraction plate; 2211. a guide groove; 222. a lead screw; 23. rotating the nut; 231. a nut; 232. a rotating shaft; 233. positioning a rod; 234. a fixing plate; 24. a hot air shower nozzle; 241. a hot air nozzle; 25. a motor; 26. mounting a plate; 3. a hot air circulating mechanism; 31. a first air outlet pipe; 311. an exhaust fan; 312. screening a screen; 32. a condensation drying box; 33. a second air outlet pipe; 34. an air inlet pipe; 4. a heat pump heating mechanism; 41. a heat absorption box; 42. residual heat pipes in factories; 43 a first heat exchange tube; 44. a heating box; 45. a second heat exchange tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

A circulating double-layer dryer and a drying method thereof are disclosed, the device comprises a frame 1, a drying mechanism 2, a hot air circulating mechanism 3 and a heat pump heating mechanism 4.

As shown in fig. 1, 2, 4 and 7, the frame 1 includes a drying box 11, the drying box 11 is provided with an inner cavity 111, a drying mechanism 2 is installed inside the drying box 11, a hot air circulation mechanism 3 is arranged at the rear side of the drying box 11, and a heat pump heating mechanism 4 is arranged at the right side of the hot air circulation mechanism 3. First air outlet 112 is opened at stoving case inner chamber 111 top, and one side that first air outlet 112 is close to inner chamber 111 is provided with first air-collecting opening 13, and first air-collecting opening 13 is opened has first air-collecting groove 131, first air-collecting groove 131 and first air outlet 112 intercommunication. The upper portion of the side wall of the inner cavity 111 near the first air outlet 112 is provided with a first through hole 113, the lower portion of the first through hole 113 is provided with an air inlet 114, the lower portion of the air inlet 114 is provided with a second through hole 115, the lower portion of the second through hole 115 is provided with a second air outlet 116, the bottom of the inner cavity 111 is provided with a second air collecting opening 14, the second air collecting opening 14 is provided with a second air collecting groove 141, and the second air collecting groove 141 is communicated with the second air outlet 116. The front of the drying box 11 is provided with a closing door 12, the outer surface of the right side of the drying box 11 close to the closing door 12 is provided with two first fixing blocks 15 which are distributed in parallel, the first fixing blocks 15 are provided with through holes 151, and the side surface of the first fixing block 15 far away from the closing door 12 is provided with two positioning holes 152 which are distributed symmetrically. Two second positioning blocks 16 which are distributed in parallel are arranged on the left side surface of the inner cavity 111 close to the closed door 12, and the heights of the two second positioning blocks 16 and the two first fixing blocks 15 are the same. A monitoring panel 17 is arranged on the left outer surface of the drying box 11 near the closed door 12, and can monitor the temperature and humidity in the inner cavity 111 and control the drying mechanism 2, the hot air circulation mechanism 3 and the heat pump heating mechanism 4 to keep the temperature and humidity of the inner cavity 111 stable.

As shown in fig. 1, 3, 4, 5, 6, and 7, the drying mechanism 2 includes a hot air nozzle 24 disposed in the inner cavity 111, hot air nozzles 241 linearly distributed are disposed on upper and lower sides of the hot air nozzle 24, two rollers 21 are symmetrically disposed above and below the hot air nozzle 24, an extraction rod 22 is disposed in the roller 21, the extraction rod 22 includes an extraction plate 221 close to the bottom of the roller 21, two symmetrically disposed guide slots 2211 are disposed on an edge of the extraction plate 221, a lead screw 222 is fixed in the middle of the extraction plate 221, and a chamfer is disposed at the end of the lead screw 222. The first fixing block 15 is provided with a rotating nut 23, one side of the drying box 11 far away from the closing door 12 is provided with two motors 25 which are distributed in parallel, a mounting plate 26 is arranged below the motors 25, and the mounting plate 26 is arranged on the drying box 11. The output end of the motor 25 is connected with the roller 21, and the motor 25 can be driven to drive the roller 21 to rotate.

A plurality of drying holes 211 are formed on the cylindrical surface of the drum 21, and the drying hot air sprayed from the hot air nozzle 241 can dry the laundry in the drum 21 through the drying holes 211. Two symmetrically distributed slide rails 212 are arranged on the inner side of the roller 21, the end of each slide rail 212 is provided with a retainer ring 213, and the slide rails 212 are matched with the guide grooves 2211.

One end of the rotating nut 23 close to the first fixing block 15 is provided with a rotating shaft 232, the rotating shaft 232 is matched with the through hole 151, the rotating shaft 232 can rotate and slide in the through hole 151, the rotating nut 23 can rotate and slide back and forth, the nut 231 is arranged in the middle of the rotating nut 23, one side of the nut 231 close to the lead screw 222 is provided with a chamfer, the nut 231 is matched with the lead screw 222, the tail end of the rotating shaft 232 is provided with a fixing plate 234, one side of the fixing plate 234 close to the first fixing block 15 is provided with two symmetrically distributed positioning rods 233, and the positioning rods 233 are matched.

As shown in fig. 1, 8, 9, and 10, the hot air circulation mechanism 3 includes a condensation drying box 32 disposed at a side of the drying box 11, a first air outlet pipe 31 is communicated above the condensation drying box 32, one end of the first air outlet pipe 31, which is far away from the condensation drying box 32, is communicated with the first air outlet 112, an exhaust fan 311 is disposed at one end of the first air outlet pipe 31, which is in contact with the drying box 11, a screen 312 is disposed at one side of the exhaust fan 311, which is close to the first air outlet 112, the exhaust fan 311 can assist in exhausting hot air with high water vapor content, and the screen 312 can filter fiber impurities in clothes, thereby preventing the impurities from entering the hot air circulation mechanism 3. The condensation drying box 32 below intercommunication has second tuber pipe 33, and the one end intercommunication second air outlet 116 that the condensation drying box 32 was kept away from to second tuber pipe 33, and the one end structure that second tuber pipe 33 and stoving case 11 contact is the same with first tuber pipe 31, all is provided with exhaust fan 311 and screen cloth 312. The heating box 44 is arranged on the side of the condensation drying box 32, the heating box 44 is communicated with the condensation drying box 32, the side of the heating box 44 far away from the condensation drying box 32 is communicated with the air inlet pipe 34, one end of the air inlet pipe 34 close to the drying box 11 is communicated with the air inlet 114, and the hot air after drying and heating is sent to the hot air spray head 24 through the air inlet 114.

The heat pump heating mechanism 4 comprises a heating box 44, a heat absorption box 41 is arranged on one side of the heating box 44 far away from the drying box, the heat absorption box 41 is communicated with the factory waste heat pipe 42, heat conducting media in the heat absorption box 41 can absorb heat in the factory waste heat pipe 42, a first heat exchange pipe 43 and a second heat exchange pipe 45 are arranged between the heat absorption box 41 and the heating box 44, the heat conducting media absorbing the heat enter the heating box 44 through the first heat exchange pipe 43 to heat air after condensation and drying, the air is changed into a low-temperature low-pressure state, the heat conducting media releasing the heat enter the heat absorption box 41 through the second heat exchange pipe 45, and the heat is compressed by a compressor to absorb the heat again.

As shown in fig. 11, when the apparatus is operated, the rotating nut 23 is rotated to a position perpendicular to the ground, and the rotating shaft 232 is slid outward, so that the positioning rod 233 is inserted into the positioning hole 152 to fix the rotating nut 23. After the drying of the apparatus is completed, as shown in fig. 3, the rotating nut 23 is rotated to the position shown in fig. 3, and the rotating nut 23 is moved forward and backward so that the nut 231 is engaged with the lead screw 222. The motor 25 is controlled by the monitoring panel 17 to drive the drum 21 to rotate, and the extraction rod 22 slides outwards along the guide slot 2211 while rotating along the drum 21 under the cooperation of the lead screw 222 and the nut 231, so that the clothes in the drum 21 are taken out.

The drying method of the device comprises the following steps:

s1, after the laundry is put into the drum 21, the closing door 12 is closed, and the motor 25 is driven to rotate the drum 21 through the monitor panel 17.

S2, hot air is sprayed from hot air nozzle 24 to dry the laundry in drum 21.

S3, the hot air containing a large amount of water vapor directly enters the first air outlet duct 31 and the second air outlet duct 33 with the aid of the first air collecting groove 131, the second air collecting groove 141, and the exhaust fan 311.

S4, the hot air containing a large amount of water vapor enters the condensation drying box through the first air outlet pipe 31 and the second air outlet pipe 33, and the water vapor is condensed and becomes dry cold air.

And S5, the dry cold air enters the heating box 44, is heated into dry hot air by the heat pump heating mechanism 4, and enters the hot air spray head 24 through the air inlet pipe 34 to realize circulating drying.

S6, the monitoring panel 17 monitors that the humidity in the drying box 11 is reduced to a preset value, and the staff is reminded to carry out the next operation.

S7, the closing door 12 is opened, the positioning rod 233 of the rotating nut 23 is slid out of the positioning hole 152, the nut 231 is engaged with the lead screw 222, and the rotating nut 23 is fixed by the first fixing block 15 and the second positioning block 16.

S8, the monitoring panel 17 controls the drum 21 to rotate, and the extraction rod 22 slides outwards along the slide rail 212 under the cooperation of the lead screw 222 and the nut 231 while rotating with the drum 21, thereby taking out the clothes in the drum 21.

S9, after the clothes are taken out, the monitoring panel 17 controls the motor 25 to rotate reversely, the extracting rod 22 returns to the original position, at this time, the rotating nut 23 is slid outwards along the through hole 151, and the rotating nut 23 is reset after the nut 231 and the lead screw 222 are disengaged. The next drying of the laundry is filled into the drum 21.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims

1. The utility model provides a circulating double-deck drying-machine, the device includes frame (1), stoving mechanism (2), heated air circulation mechanism (3) and heat pump heating mechanism (4), its characterized in that, frame (1) is including stoving case (11), and stoving case (11) are opened there is inner chamber (111), and stoving case (11) internally mounted has stoving mechanism (2), and stoving case (11) side rear is provided with heated air circulation mechanism (3), and heated air circulation mechanism (3) right side is provided with heat pump heating mechanism (4).

2. A circulating type double-layer dryer according to claim 1, characterized in that a first air outlet (112) is opened at the top of the inner cavity (111) of the drying box, a first air collecting opening (13) is arranged at one side of the first air outlet (112) close to the inner cavity (111), a first air collecting groove (131) is opened at the first air collecting opening (13), the first air collecting groove (131) is communicated with the first air outlet (112), a first through hole (113) is opened at the upper part of the side wall of the inner cavity (111) close to the first air outlet (112), an air inlet (114) is opened below the first through hole (113), a second through hole (115) is opened below the air inlet (114), a second air outlet (116) is opened below the second through hole (115), a second air collecting opening (14) is arranged at the bottom of the inner cavity (111), a second air collecting groove (141) is opened at the second air collecting opening (14), and the second air collecting groove (141) is communicated with the second air outlet (116), the front of the drying box (11) is provided with a sealing door (12), the outer surface of the right side of the drying box (11) close to the sealing door (12) is provided with two first fixing blocks (15) which are distributed in parallel, through holes (151) are formed in the first fixing blocks (15), the side face, far away from the sealing door (12), of each first fixing block (15) is provided with two positioning holes (152) which are distributed symmetrically, the position, close to the sealing door (12), of the left side face of the inner cavity (111) is provided with two second positioning blocks (16) which are distributed in parallel, the heights of the two second positioning blocks (16) and the two first fixing blocks (15) are the same, and the position, close to the sealing door (12), of the outer surface of the left side.

3. The circulating double-layer dryer according to claim 1, wherein the drying mechanism (2) comprises a hot air nozzle (24) arranged in the inner cavity (111), the upper and lower sides of the hot air nozzle (24) are provided with hot air nozzles (241) distributed linearly, two rollers (21) are symmetrically distributed above and below the hot air nozzle (24), an extraction rod (22) is arranged in each roller (21), the extraction rod (22) comprises an extraction plate (221) close to the bottom of the roller (21), the edge of the extraction plate (221) is provided with two guide grooves (2211) distributed symmetrically, a lead screw (222) is fixed in the middle of the extraction plate (221), the tail end of the lead screw (222) is provided with a chamfer, the first fixed block (15) is provided with a rotating nut (23), one side of the drying box (11) far away from the closed door (12) is provided with two motors (25) distributed in parallel, and a mounting plate (26) is arranged below the motors (25), the mounting plate (26) is arranged on the drying box (11), and the output end of the motor (25) is connected with the roller (21).

4. A circulating type double-deck dryer according to claim 3, characterized in that the cylindrical surface of the drum (21) is provided with a plurality of drying holes (211), the inner side of the drum (21) is provided with two symmetrically distributed slide rails (212), the tail ends of the slide rails (212) are provided with retaining rings (213), and the slide rails (212) are matched with the guide slots (2211).

5. A circulating type double-layer dryer according to claim 3, characterized in that a rotating shaft (232) is arranged at one end of the rotating nut (23) close to the first fixing block (15), the rotating shaft (232) is matched with the through hole (151), the rotating shaft (232) can rotate and slide in the through hole (151), a nut (231) is arranged in the middle of the rotating nut (23), a chamfer is arranged at one side of the nut (231) close to the lead screw (222), the nut (231) is matched with the lead screw (222), a fixing plate (234) is arranged at the tail end of the rotating shaft (232), two symmetrically distributed positioning rods (233) are arranged at one side of the fixing plate (234) close to the first fixing block (15), and the positioning rods (233) are matched with the positioning holes (152).

6. The circulating type double-layer dryer according to claim 1, wherein the hot air circulating mechanism (3) comprises a condensation drying box (32) arranged on the side of the drying box (11), a first air outlet pipe (31) is communicated above the condensation drying box (32), one end, away from the condensation drying box (32), of the first air outlet pipe (31) is communicated with a first air outlet (112), a second air outlet pipe (33) is communicated below the condensation drying box (32), one end, away from the condensation drying box (32), of the second air outlet pipe (33) is communicated with a second air outlet (116), a heating box (44) is arranged on the side of the condensation drying box (32), the heating box (44) is communicated with the condensation drying box (32), one side, away from the condensation drying box (32), of the heating box (44) is communicated with an air inlet pipe (34), and one end, close to the drying box (11), of the air inlet pipe (34) is communicated with an air inlet (114).

7. A circulating type double-layer dryer according to claim 6, characterized in that an exhaust fan (311) is arranged at the end of the first air outlet pipe (31) contacting the drying box (11), a screen (312) is arranged at the side of the exhaust fan (311) close to the first air outlet (112), and the end of the second air outlet pipe (33) contacting the drying box (11) has the same structure as the first air outlet pipe (31).

8. A circulating type double-deck dryer according to claim 1, wherein said heat pump heating mechanism (4) comprises a heating box (44), an heat absorption box (41) is arranged on one side of the heating box (44) far away from the drying box, the heat absorption box (41) is communicated with the residual heat pipe (42), and a first heat exchange pipe (43) and a second heat exchange pipe (45) are arranged between the heat absorption box (41) and the heating box (44).

9. A drying method of a circulation type double layer dryer comprising the circulation type double layer dryer according to any one of claims 1 to 8, wherein the drying method comprises the steps of:

s1, after clothes are put into the roller (21), the closing door (12) is closed, and the motor (25) is driven by the monitoring panel (17) to drive the roller (21) to rotate;

s2, the hot air nozzle (24) sprays hot air to dry the clothes in the drum (21);

s3, hot air containing a large amount of water vapor directly enters the first air outlet pipe (31) and the second air outlet pipe (33) under the assistance of the first air collecting groove (131), the second air collecting groove (141) and the exhaust fan (311);

s4, enabling hot air containing a large amount of water vapor to enter a condensation drying box through a first air outlet pipe (31) and a second air outlet pipe (33), and changing the water vapor into dry cold air after condensation;

s5, drying cold air enters a heating box (44), is heated into drying hot air by a heat pump heating mechanism (4), and enters a hot air nozzle (24) through an air inlet pipe (34) to realize circulating drying;

s6, monitoring the humidity in the drying box (11) to be reduced to a preset value by the monitoring panel (17) and reminding workers to carry out the next operation;

s7, opening the closing door (12), sliding the positioning rod (233) of the rotating nut (23) out of the positioning hole (152), enabling the nut (231) to be matched with the screw rod (222), and fixing the rotating nut (23) under the action of the first fixing block (15) and the second positioning block (16);

s8, the monitoring panel (17) controls the drum (21) to rotate, the extraction rod (22) rotates along with the drum (21) and slides outwards along the slide rail (212) under the matching of the lead screw (222) and the nut (231), and therefore clothes in the drum (21) are taken out;

s9, after the clothes are taken out, the monitoring panel (17) controls the motor (25) to rotate reversely, the extracting rod (22) returns to the original position, at the moment, the rotating nut (23) slides outwards along the through hole (151), the rotating nut (23) is reset after the nut (231) and the lead screw (222) are separated, and the clothes are filled into the drum (21) for next drying.