PP particle drying equipment for producing washing machine shell

Abstract

The invention relates to the field of plastic processing machinery pretreatment equipment, and discloses PP particle drying equipment for producing a washing machine shell, which comprises a frame, an inclined block is fixed in the frame, a tank body is fixedly connected in the inclined block, a hinge is arranged outside the tank body, the bottom of the tank body is rotatably connected with a discharge hopper, and the discharge hopper is rotatably connected with the bottom of the tank body. Bolts are arranged in the middle of the discharging hopper and the middle of the tank body, a window is arranged in the middle of the tank body, a cover body is arranged on the top of the tank body, a conveying assembly is fixedly connected to the top of the cover body, a driving assembly is arranged at the bottom of the conveying assembly, and a dust collection assembly is fixedly connected to the middle of the tank body. The collecting assembly is arranged at the bottom of the dust suction assembly. Positive and negative charge ions are generated through the ion rod and the particle flow generator, and the ion wind is blown out through the ion wind nozzle by using the blower, so that static electricity can be neutralized, and PP particle caking caused by the static electricity is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plastic processing machinery pretreatment equipment, in particular to a PP particle drying equipment for producing washing machine shell. BACKGROUND

[0002] Polypropylene (PP) particles are the main raw material for producing washing machine shell, and the material properties are directly related to the performance and appearance quality of the final product. Before injection molding, sufficient drying treatment is carried out on the PP particles to remove the moisture contained therein, which is a key process to ensure product qualification rate. Currently, hot air drying equipment is commonly used in the industry to treat PP particles.

[0003] However, in the existing conventional drying equipment, a large amount of static electricity is inevitably generated by the friction between the particles during the conveying and turning of the PP particles. The presence of static electricity can attract fine dust in the workshop environment, or cause the particles to agglomerate, which will directly affect the cleanliness and surface finish of the washing machine shell product. In addition, the mixture of dust and water vapor generated during the drying process will directly escape into the workshop environment if not effectively treated. Many existing equipment lack efficient and closed dust collection systems, not only causing environmental pollution in the production site, but also posing a potential threat to the occupational health of operators. At the same time, the dried particles are prone to clogging at the discharge opening during the discharge of the equipment, resulting in poor discharge and reducing the continuity and automation level of production. SUMMARY

[0004] The purpose of the present application is to provide a PP particle drying equipment for producing washing machine shell, which solves the problem of dust adsorption and agglomeration caused by friction and static electricity, affecting the quality of the final product.

[0005] To achieve the above purpose, the present application is implemented by the following technical scheme: a PP particle drying equipment for producing washing machine shell, comprising a frame, a slope fixed inside the frame, a tank fixedly connected inside the slope, a hinge provided outside the tank, a discharge hopper rotatably connected to the bottom of the tank, a bolt provided between the discharge hopper and the middle part of the tank, a window provided in the middle part of the tank, a cover provided on the top of the tank, a conveying assembly fixedly connected to the top of the cover, a driving assembly provided at the bottom of the conveying assembly, a dust collection assembly fixedly connected to the middle part of the tank, a collection assembly provided at the bottom of the dust collection assembly, a discharging assembly fixedly connected to the bottom of the tank, a stirring assembly provided at the bottom of the driving assembly, and an electrostatic elimination assembly provided by the discharging assembly for demagnetizing the falling PP particles. The static electricity elimination assembly comprises a blower, the top of the cover body is fixedly connected with the blower, the middle part of the blower is fixedly connected with an ion air duct, one end of the ion air duct is fixedly connected with a shell three, the inside of the shell three is fixedly connected with an ion rod, the middle part of the shell three is fixedly connected with an ion air nozzle, and the outside of the ion air duct is fixedly connected with a particle flow generator.

[0006] Preferably, the dust suction assembly comprises a cyclone separator, the outside of the frame is fixedly connected with the cyclone separator, the top of the cyclone separator is fixedly connected with a centrifugal fan, the inside of the centrifugal fan is rotatably connected with an impeller, the middle part of the centrifugal fan is provided with a purification air duct, the middle part of the centrifugal fan is fixedly connected with a pipeline, the other end of the pipeline is fixedly connected with the middle part of the cover body, and the middle part of the cyclone separator is provided with a valve body.

[0007] Preferably, the collection assembly comprises a collection box, the outside of the frame is fixedly connected with the collection box, the inside of the collection box is slidably connected with a drawer, and the outside of the drawer is fixedly connected with a handle.

[0008] Preferably, the conveying assembly comprises a mounting frame, the top of the frame is fixedly connected with the mounting frame, the middle part of the mounting frame is fixedly connected with a motor two, the output end of the motor two is fixedly connected with a rotating shaft two, the outside of the rotating shaft two is fixedly connected with a spiral blade, the outside of the mounting frame is fixedly connected with a shell two, and the middle part of the shell two is fixedly connected with a feeding pipe and a feeding hopper.

[0009] Preferably, the driving assembly comprises a support, the outside of the tank body is fixedly connected with the support, the outside of the support is fixedly connected with a motor one, the output end of the motor one is fixedly connected with a group of pulleys, the outside of the group of pulleys is sleeved with a chain, the top of the cover body is fixedly connected with a shell one, and the chain is arranged in the middle part of the shell one.

[0010] Preferably, the stirring assembly comprises a rotating shaft one, the middle part of the group of pulleys is fixedly connected with the rotating shaft one, the outside of the rotating shaft one is fixedly connected with a stirring blade and a scraper one, the bottom of the rotating shaft one is fixedly connected with a scraper two, the scraper one is fixedly connected to the outside of the scraper two, and the scraper one is in contact with the inner wall of the tank body.

[0011] Preferably, the discharging assembly comprises a mesh, the bottom of the feeding hopper is fixedly connected with the mesh, the scraper two is in contact with the surface of the mesh, the middle part of the feeding hopper is fixedly connected with a discharging pipe, the outside of the feeding hopper is fixedly connected with a vibrator, and the middle part of the tank body is fixedly connected with a material level meter.

[0012] Preferably, the shell three is fixedly connected outside the feeding pipe, and the ion wind nozzle is fixedly connected to the middle part of the feeding pipe.

[0013] Preferably, the middle part of the discharge hopper is fixedly connected with a hot air duct, the top of the hot air duct is fixedly connected with a hot air blower, the outside of the hot air duct is fixedly connected with a control screen, and the outside of the hot air duct is fixedly connected with a temperature table.

[0014] To sum up, the present application has the following at least one beneficial technical effect: 1. The present application generates positive and negative charge ions by the ion rod and the particle flow generator, blows out the ion wind through the ion wind nozzle by the hair dryer, can neutralize static electricity, avoid PP particle agglomeration caused by static electricity, drive the stirring assembly in the tank body by the driving assembly, fully stir the PP particles, ensure uniform heating, also can scrape the residual material in the inner wall of the tank body, avoid local overheating caused by PP particle metamorphism, cooperate with the hot air duct and the hot air blower to accurately control the drying temperature, cooperate with the temperature table to monitor in real time, effectively prevent the temperature fluctuation from affecting the performance of the PP particles. Provide uniform texture and high cleanliness of raw materials for subsequent washing machine shell injection molding, improve product pass rate.

[0015] 2. The present application quickly sucks away the dust and water vapor generated in the drying process by the cyclone separator and the centrifugal fan through the dust suction assembly, enters the inside of the collection assembly, is uniformly cleaned, is separated from the gas under the action of centrifugal force, and the pure gas is discharged through the purification air duct, so that the harm of long-term inhalation of plastic dust to the respiratory system of employees is avoided, the air quality in the workshop is improved, and the health of the operators is protected.

[0016] 3. The present application timely scrapes the adhered particles by the scraper two of the stirring assembly, prevents the mesh screen from being blocked, the high-frequency vibration of the vibrator enhances the power of the particles passing through the mesh screen, accelerates the discharging process, avoids the particles from being retained in the discharge hopper and being damp, and protects the dryness and discharging efficiency of the particles after drying. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the present application; Figure 2 It is a frame schematic view of the present application; Figure 3 It is a side view of the present application; Figure 4 It is a tank body sectional view of the present application; Figure 5 It is a shell three sectional view of the present application; Figure 6 It is a shell two sectional view of the present application; Figure 7 It is a chain schematic view of the present application; Figure 8A schematic diagram of the cyclone separator of the present application.

[0018] 1, frame; 2, tank body; 3, motor one; 4, shell one; 5, chain; 6, shell two; 7, pipeline; 8, hot air machine; 9, control screen; 10, hot air duct; 11, temperature gauge; 12, discharge hopper; 13, discharge pipe; 14, cyclone separator; 15, collection box; 16, drawer; 17, inclined block; 18, hinge; 19, motor two; 20, feed hopper; 21, level gauge; 22, support; 23, discharging pipe; 24, pulley; 25, stirring blade; 26, rotating shaft one; 27, scraper one; 28, scraper two; 29, mesh screen; 30, vibrator; 31, bolt; 32, shell three; 33, ion wind nozzle; 34, window; 35, ion rod; 36, hair dryer; 37, particle flow generator; 38, helical blade; 39, mounting bracket; 40, ion air duct; 41, rotating shaft two; 42, impeller; 43, handle; 44, purification air duct; 45, cover; 46, centrifugal fan; 47, valve body. DETAILED DESCRIPTION

[0019] The following will be described in detail below Figure 1 -Appendix Figure 8 The present application will be further described in detail.

[0020] The PP particle drying equipment for producing washing machine shell provided by the embodiment of the present application comprises a frame 1, an inclined block 17 is fixed in the frame 1, a tank body 2 is fixedly connected to the inside of the inclined block 17, a hinge 18 is arranged on the outside of the tank body 2, a discharge hopper 12 is rotatably connected to the bottom of the tank body 2, a bolt 31 is arranged on the middle part of the discharge hopper 12 and the tank body 2, a window 34 is arranged on the middle part of the tank body 2, a cover 45 is arranged on the top of the tank body 2, a conveying assembly is fixedly connected to the top of the cover 45, a driving assembly is arranged on the bottom of the conveying assembly, a dust suction assembly is fixedly connected to the middle part of the tank body 2, a collection assembly is arranged on the bottom of the dust suction assembly, a discharging assembly is fixedly connected to the bottom of the tank body 2, a stirring assembly is arranged on the bottom of the driving assembly, and an electrostatic elimination assembly is arranged on the discharging assembly, which is used for eliminating magnetism of the falling PP particles; The static electricity elimination assembly comprises a blower 36 fixedly connected to the top of the cover 45, a middle part of the blower 36 is fixedly connected with an ion air duct 40, one end of the ion air duct 40 is fixedly connected with a shell three 32, the inside of the shell three 32 is fixedly connected with an ion rod 35, a middle part of the shell three 32 is fixedly connected with an ion air nozzle 33, and the outside of the ion air duct 40 is fixedly connected with a particle flow generator 37. The shell three 32 is fixedly connected to the outside of the feeding pipe 23, and the ion air nozzle 33 is fixedly connected to the middle part of the feeding pipe 23. A middle part of the discharge hopper 12 is fixedly connected with a hot air duct 10, a top of the hot air duct 10 is fixedly connected with a hot air blower 8, the outside of the hot air duct 10 is fixedly connected with a control screen 9, and the outside of the hot air duct 10 is fixedly connected with a temperature table 11.

[0021] Specifically, static electricity is generated in the PP particles due to friction during transportation, which causes the PP particles to agglomerate or adsorb broken PP particle dust, affecting the subsequent washing machine shell injection molding quality. The ion rod 35 is excited by the high-frequency high-voltage of the particle flow generator 37 to release a large number of positive and negative charge ions, and the blower 36 continuously generates stable airflow which is delivered to the inside of the shell three 32 through the ion air duct 40. These ions are fully mixed with the airflow in the air duct to form ion wind, and the mixed ion wind blows towards the falling PP particles through the ion air nozzle 33 fixed in the middle part of the feeding pipe 23. The positive and negative ions in the ion wind can quickly neutralize the static charge on the surface of the particles, so that the PP particles restore to the electrically neutral state, thereby blocking the physical basis of dust adsorption from the source. The PP particles enter the inside of the tank 2, and the electric heating pipe first heats the entering air to form hot air with a set temperature. Under the drive of the hot air blower 8, the hot air is delivered to the inside of the discharge hopper 12 through the hot air duct 10, ensuring that the hot air can penetrate the entire material layer. The contact efficiency of the hot air and the PP particles is high, and the drying speed is fast.

[0022] Please refer to the accompanying Figure 1 , the accompanying Figure 2 and the accompanying Figure 8 , the dust collection assembly comprises a cyclone separator 14 fixedly connected to the outside of the frame 1, a top of the cyclone separator 14 is fixedly connected with a centrifugal fan 46, the inside of the centrifugal fan 46 is rotatably connected with an impeller 42, a middle part of the centrifugal fan 46 is provided with a purification air duct 44, a middle part of the centrifugal fan 46 is fixedly connected with a pipeline 7, the other end of the pipeline 7 is fixedly connected to the middle part of the cover 45, and a middle part of the cyclone separator 14 is provided with a valve body 47. The collection assembly comprises a collection box 15 fixedly connected to the outside of the frame 1, the inside of the collection box 15 is slidably connected with a drawer 16, and the outside of the drawer 16 is fixedly connected with a handle 43.

[0023] Specifically, when the device heats and dries materials such as PP particles, the centrifugal fan 46 is started, the impeller 42 rotates at high speed to generate negative pressure, the dust-containing airflow is sucked into the cyclone separator 14 through the pipeline 7, the dust particles are separated from the air by centrifugal force, the dust with high density moves to the inner wall of the cyclone separator 14 and falls under the action of gravity, the purified air is discharged from the purification air duct 44, and the separated dust enters the collection box 15 of the dust collection assembly through the valve body 47 and falls into the drawer 16 inside. The operator can regularly pull out the drawer 16 through the external handle 43 to concentrate on cleaning, realize closed-loop treatment of dust, avoid pollution of the workshop environment, and protect the health of the operator.

[0024] Please refer to the accompanying drawings Figure 1 , the accompanying drawings Figure 2 , the accompanying drawings Figure 3 , and the accompanying drawings Figure 6 , the conveying assembly comprises a mounting frame 39 fixedly connected to the top of the frame 1, a motor 2 19 fixedly connected to the middle of the mounting frame 39, a rotating shaft 2 41 fixedly connected to the output end of the motor 2 19, a spiral blade 38 fixedly connected to the outside of the rotating shaft 2 41, an outer shell 2 6 fixedly connected to the outside of the mounting frame 39, and a discharge pipe 23 and a feed hopper 20 fixedly connected to the middle of the outer shell 2 6.

[0025] Specifically, the motor 2 19 drives the rotating shaft 2 41 to rotate, and the spiral blade 38 outside the rotating shaft 2 41 rotates synchronously. After the operator puts the PP particles into the feed hopper 20, the particles are continuously pushed by the spiral blade 38 in the closed space of the outer shell 2 6 to the discharge pipe 23, and the directional conveying of the material is realized by the propelling force of the spiral structure, and finally accurately falls into the tank 2 for drying treatment. Through the stable transmission of the spiral blade 38 and the motor, the continuous feeding of the PP particles is realized, and the closed design of the outer shell 2 6 cooperates with the close pushing of the spiral blade 38. Under the synergistic action of the ion air nozzle 33 of the electrostatic elimination assembly and the discharge pipe 23, the PP particles have completed the preliminary electrostatic elimination before entering the tank 2, which lays a foundation for the cleanliness of the subsequent drying link.

[0026] Please refer to the accompanying drawings Figure 1 , the accompanying drawings Figure 2 , the accompanying drawings Figure 3 , the accompanying drawings Figure 4 , and the accompanying drawings Figure 7The driving assembly comprises a support 22 fixedly connected to the outside of the tank body 2, an electric motor 3 fixedly connected to the outside of the support 22, a set of pulleys 24 fixedly connected to the output end of the electric motor 3, a chain 5 sleeved on the outside of the set of pulleys 24, a shell 4 fixedly connected to the top of the cover body 45, and the chain 5 arranged at the middle portion of the shell 4.

[0027] Specifically, the electric motor 3 drives the set of pulleys 24 to rotate, and the chain 5 sleeved on the pulleys drives the other set of pulleys 24 to rotate, so as to realize power transmission. The chain 5 stably operates under the protection of the shell 4, and delivers power to the rotating shaft 26 of the stirring assembly. The rotating shaft 26 drives the stirring blades 25 and the scraper 27 on the outside and the scraper 28 at the bottom to rotate synchronously. The stirring blades 25 move the PP particles in the tank in all directions, breaking the particle accumulation state. The scraper 27 rotates along the inner wall of the tank 2, and the adhered particles are scraped off to avoid local overheating. The scraper 28 contacts the surface of the mesh 29 to prevent the particles from blocking the mesh holes. The stirring blades 25 and the scraper can effectively solve the problems of particle adhesion and caking, make the PP particles more evenly heated, reduce quality defects caused by insufficient local drying, and provide stable material for subsequent washing machine shell forming.

[0028] Please refer to the attached Figure 1 -attached Figure 4 The discharging assembly comprises a mesh 29 fixedly connected to the bottom of the discharge hopper 12, the scraper 28 in contact with the surface of the mesh 29, a discharge pipe 13 fixedly connected to the middle portion of the discharge hopper 12, a vibrator 30 fixedly connected to the outside of the discharge hopper 12, and a material level gauge 21 fixedly connected to the middle portion of the tank body 2.

[0029] Specifically, the PP particles fall to the surface of the mesh 29 under the action of gravity, and the scraper 28 is in close contact with the surface of the mesh 29 to scrape the particles to prevent the mesh holes from being blocked. At the same time, the particles are subjected to secondary screening to ensure the uniformity of the discharged particles. The external vibrator 30 is started synchronously to provide additional power for the particles falling by high-frequency vibration, accelerate the material passing through the mesh 29 and entering the discharge pipe 13, and finally complete the discharging. The material level gauge 21 monitors the remaining material in the tank in real time.

[0030] Working principle: The operator pours PP particles from the feeding hopper 20, the motor 2 19 drives the rotating shaft 2 41 to rotate, so that the spiral blade 38 rotates, and the PP particles are pushed to the discharge pipe 23 by the spiral blade 38, and the automatic feeding is completed. At the same time, the static electricity elimination assembly is started synchronously, the air blower 36 generates airflow which is delivered to the shell 3 32 through the ion air duct 40, the particle stream generator 37 excites the ion rod 35 to release positive and negative ions, and the ion air nozzle 33 blows the ion-containing airflow into the discharge pipe 23, so that the PP particles restore the electrically neutral state and avoid the agglomeration of the PP particles. After the particles enter the tank body 2, the driving assembly drives the stirring assembly to rotate, the motor 1 3 drives the rotating shaft 1 26 to rotate through the belt wheel 24 and the chain 5, the stirring blade 25 stirs the particles to ensure uniform heating; the scraper 1 27 rotates close to the inner wall of the tank body 2 to prevent the particles from adhering and caking, the scraper 2 28 is tightly attached to the surface of the screen 29 to prevent the particles from blocking the mesh holes, and the air heater 8 blows hot air into the tank body 2 through the hot air duct 10, and the temperature table 1 1 monitors the temperature in real time. The operator can adjust the hot air parameters through the control screen 9 to ensure the drying effect.

[0031] The dust and water vapor generated during the drying process are timely treated by the dust collection assembly. The centrifugal fan 46 drives the impeller 42 to rotate, and the dust-containing gas in the tank body 2 is sucked into the cyclone separator 14 through the pipeline 7. Under the action of centrifugal force, the dust is separated from the gas, the pure gas is discharged from the purification air duct 44, and the dust falls into the drawer 16 of the collection assembly through the valve body 47, so that the dust is conveniently collected. When discharging, the level meter 21 monitors that the particles are dried, and then the vibrator 30 is started to promote the particles to be discharged from the discharge pipe 13 after being screened by the screen 29, and the operator can observe the state in the tank through the window 34.

[0032] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A drying device for producing PP granules for washing machine shells, comprising a frame (1), characterized in that, The frame (1) has an internal fixed inclined block (17), and the inclined block (17) is fixedly connected to a tank (2). The tank (2) is provided with a hinge (18) on the outside. The bottom of the tank (2) is rotatably connected to a discharge hopper (12). The discharge hopper (12) and the middle of the tank (2) are provided with bolts (31). The middle of the tank (2) is provided with a viewing window (34). The top of the tank (2) is provided with a cover (45). The top of the cover (45) is fixedly connected to a conveying component. The bottom of the conveying component is provided with a driving component. The middle of the tank (2) is fixedly connected to a dust collection component. A collection component is provided at the bottom of the dust collection component. The bottom of the tank (2) is fixedly connected to a feeding component. The bottom of the driving component is provided with a stirring component. An electrostatic elimination component is provided through the feeding component to demagnetize the falling PP particles. The static elimination assembly includes a hair dryer (36), which is fixedly connected to the top of the cover (45). An ion air duct (40) is fixedly connected to the middle of the hair dryer (36). A housing three (32) is fixedly connected to one end of the ion air duct (40). An ion rod (35) is fixedly connected inside the housing three (32). An ion nozzle (33) is fixedly connected to the middle of the housing three (32). A particle flow generator (37) is fixedly connected to the outside of the ion air duct (40).

2. The PP granule drying equipment for producing washing machine shells according to claim 1, characterized in that, The dust collection assembly includes a cyclone separator (14), which is fixedly connected to the outside of the frame (1). A centrifugal fan (46) is fixedly connected to the top of the cyclone separator (14). An impeller (42) is rotatably connected inside the centrifugal fan (46). A purification air duct (44) is opened in the middle of the centrifugal fan (46). A pipe (7) is fixedly connected to the middle of the centrifugal fan (46). The other end of the pipe (7) is fixedly connected to the middle of the cover (45). A valve body (47) is provided in the middle of the cyclone separator (14).

3. The PP granule drying equipment for producing washing machine shells according to claim 1, characterized in that, The collection assembly includes a collection box (15), which is fixedly connected to the outside of the frame (1). A drawer (16) is slidably connected inside the collection box (15), and a handle (43) is fixedly connected to the outside of the drawer (16).

4. The PP granule drying equipment for producing washing machine shells according to claim 1, characterized in that, The conveying assembly includes a mounting frame (39), which is fixedly connected to the top of the frame (1). A second motor (19) is fixedly connected to the middle of the mounting frame (39). A second rotating shaft (41) is fixedly connected to the output end of the second motor (19). A spiral blade (38) is fixedly connected to the outside of the second rotating shaft (41). A second outer shell (6) is fixedly connected to the outside of the mounting frame (39). A feed pipe (23) and a feed hopper (20) are fixedly connected to the middle of the second outer shell (6).

5. The PP granule drying equipment for producing washing machine shells according to claim 1, characterized in that, The drive assembly includes a bracket (22), which is fixedly connected to the outside of the tank (2). A motor (3) is fixedly connected to the outside of the bracket (22). A set of pulleys (24) is fixedly connected to the output end of the motor (3). A chain (5) is sleeved on the outside of the set of pulleys (24). A shell (4) is fixedly connected to the top of the cover (45). The chain (5) is located in the middle of the shell (4).

6. The PP granule drying equipment for producing washing machine shells according to claim 5, characterized in that, The stirring assembly includes a rotating shaft (26), which is fixedly connected to the middle of a set of pulleys (24). A stirring blade (25) and a scraper (27) are fixedly connected to the outside of the rotating shaft (26). A scraper (28) is fixedly connected to the bottom of the rotating shaft (26). The scraper (27) is fixedly connected to the outside of the scraper (28). The scraper (27) is in contact with the inner wall of the tank (2).

7. A drying device for producing PP granules for washing machine casings according to claim 6, characterized in that, The feeding assembly includes a strainer (29), which is fixedly connected to the bottom of the discharge hopper (12). The scraper (28) is in contact with the surface of the strainer (29). A discharge pipe (13) is fixedly connected to the middle of the discharge hopper (12). A vibrator (30) is fixedly connected to the outside of the discharge hopper (12). A level gauge (21) is fixedly connected to the middle of the tank (2).

8. A drying device for producing PP granules for washing machine casings according to claim 4, characterized in that, The outer shell (32) is fixedly connected to the outside of the feed pipe (23), and the ion nozzle (33) is fixedly connected to the middle of the feed pipe (23).

9. A drying device for producing PP granules for washing machine casings according to claim 1, characterized in that, A hot air duct (10) is fixedly connected to the middle of the discharge hopper (12), a hot air blower (8) is fixedly connected to the top of the hot air duct (10), a control panel (9) is fixedly connected to the outside of the hot air duct (10), and a thermometer (11) is fixedly connected to the outside of the hot air duct (10).

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