Heat convection circulation dryer

Abstract

The utility model discloses a heat convection circulation dryer which comprises a drying rack and chain wheel covers, two sets of chain wheel covers are arranged on the outer wall of the drying rack, the chain wheel covers are symmetrically installed, a left drying rack is arranged in the drying rack, and a right drying rack is arranged in the drying rack on one side of the left drying rack. The top ends of the left drying frame and the right drying frame are each provided with a heating pipe assembly, the heating pipe assemblies are symmetrically installed, and the top ends of the heating pipe assemblies are each provided with a heating pipe outer cover. According to the heat convection circulation drying machine, convenient tableware conveying drying treatment and reciprocating swing type heat drying operation of the heat convection circulation drying machine are achieved, efficient heat convection drying operation on tableware is achieved, heat energy loss is reduced, heat damage to passing tableware caused by too high local temperature is prevented, and the heat energy utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of drying machines, in particular to a thermal convection circulation drying machine. Background Art

[0002] Dryers can be divided into two types: industrial and civil. Industrial dryers are also called drying equipment or dryers. Civil dryers are a type of washing machinery. They have high drying intensity. Since the material is highly dispersed in the airflow, the entire surface of the particles is actively used as the effective drying area, and the drying time is short. The airflow dryer has a simple structure, small footprint, easy construction and maintenance, large processing capacity, and high thermal efficiency. The use of a dryer requires electricity. Some low-quality, old dryers may have safety hazards, such as fire, leakage, etc. In addition, you need to follow safety operating procedures when using a dryer, otherwise it may also cause safety accidents.

[0003] For example, a hot air circulation energy-saving dryer disclosed in the authorization announcement number CN219589302U includes a drying box, a drying chamber and a pipe seat, the drying chamber is arranged through the front end of the drying box, the pipe seat is plugged and fixed at the rear end of the drying box, a pair of hot drying pipes are arranged at the inner upper end between the pipe seat and the drying chamber, a heating seat is fixed between the hot drying pipes, the front end of the hot drying pipe passes through the top of the drying chamber, a guide pipe is arranged through the lower end of the hot drying pipe, and a transfer pipe is arranged between the guide pipe and the bottom end of the drying chamber, and valve pipes are plugged at both ends of the transfer pipe;

[0004] Although the circular circulation pipeline is used to transport the heat to the drying chamber in a convection manner, the heat energy utilization rate of the dryer is improved while the drying effect of the dryer is ensured;

[0005] However, the problem that the existing dryers are not conducive to convenient tableware conveying and drying and reciprocating swing heat drying operations, are not conducive to efficient thermal convection drying of tableware, and local excessive temperature can easily cause thermal damage to the tableware passing through, greatly affecting the utilization rate of thermal energy. Utility Model Content

[0006] The purpose of the utility model is to provide a thermal convection circulation dryer to solve the problem that the dryer proposed in the above background technology is not convenient for convenient conveying tableware for drying and reciprocating swing thermal drying operation, is not conducive to efficient thermal convection drying operation of tableware, and the local temperature is too high to easily cause thermal damage to the tableware passing through, which greatly affects the utilization rate of thermal energy.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heat convection circulation dryer, comprising a drying frame and a sprocket cover, two groups of sprocket covers are arranged on the outer wall of the drying frame, and the sprocket covers are symmetrically arranged, a left drying frame is arranged inside the drying frame, a right drying frame is arranged inside the drying frame on one side of the left drying frame, heating tube assemblies are installed on the tops of the left drying frame and the right drying frame, and the heating tube assemblies are symmetrically arranged, and heating tube outer covers are arranged on the tops of the heating tube assemblies, three groups of left drying fans are installed at equal intervals inside the drying frame on one side of the heating tube assembly, left air ducts are installed on the side walls of the left drying fan, and the left air ducts are connected to the heating tube assemblies, and three groups of right drying fans are installed at equal intervals inside the drying frame on the other side of the heating tube assembly, right air ducts are installed on the side walls of the right drying fan, and the right air ducts are connected to the heating tube assemblies.

[0008] Preferably, the bottom end of the left drying fan is provided with a left air inlet hood, and the left air inlet hood is fixedly connected to the left drying rack, and the left air inlet hood extends to the interior of the drying rack; the bottom end of the right drying fan is provided with a right air inlet hood, and the right air inlet hood is fixedly connected to the left drying rack, and the right air inlet hood extends to the interior of the drying rack.

[0009] Preferably, a stepper motor is installed inside the drying machine frame, a driven rod is installed at the output end of the stepper motor, and the driven rod extends to the inside of the sprocket cover, a transmission rod is arranged inside the drying machine frame above the stepper motor, and both ends of the transmission rod extend to the inside of the sprocket cover, and three groups of driving sprockets with equal spacing are mounted on the surface of the transmission rod, and two groups of auxiliary sprockets are installed on the outer wall of the driven rod inside the sprocket cover, and the auxiliary sprockets are symmetrically installed.

[0010] Preferably, driven sprockets are installed on the outer walls of the transmission rods inside the sprocket cover, and the driven sprockets are installed symmetrically. Linkage chains are movably installed on the outer walls of the driven sprockets, and the linkage chains extend to the surface of the auxiliary sprockets, and the linkage chains are meshed with the driven sprockets and the auxiliary sprockets. A transmission chain is movably installed on the outer walls of the driving sprockets.

[0011] Preferably, a plurality of groups of material plates with equal spacing are arranged inside the drying machine frame above the transmission chain, and the material plates are movably connected to the transmission chain, a support rod is arranged inside the drying machine frame on the side of the material plate away from the transmission rod, and the support rod is symmetrically installed with the transmission rod, and three groups of support sprockets with equal spacing are mounted on the outer wall of the support rod.

[0012] Preferably, a flexible air outlet hood is installed at the bottom end of the heating tube assembly, a positioning frame is provided at the bottom end of the left drying rack on both sides of the flexible air outlet hood, two sets of swing arms are installed on the outer wall of the positioning frame, and the swing arms are connected to the flexible air outlet hood, a clamping shaft is provided on the side of the swing arm close to the positioning frame, and the swing arm is movably connected to the positioning frame through the clamping shaft.

[0013] Preferably, a rotating arm is arranged between the two groups of swing arms above the positioning frame, a rotating shaft is arranged on the side of the rotating arm close to the swing arm, and the rotating arm is movably connected with the swing arm through the rotating shaft, a servo motor is installed on the outer wall of the positioning frame, a connecting arm is installed at the output end of the servo motor, a linkage arm is movably installed at the top of the connecting arm, and the linkage arm is movably connected with the rotating arm through the rotating shaft.

[0014] Preferably, a remote controller is installed on the outer wall of the drying machine frame, and the output end of the remote controller is electrically connected to the input ends of the stepper motor, the left drying fan, the right drying fan, the heating tube assembly, and the servo motor.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the dryer not only realizes the convenient tableware conveying drying process and reciprocating swing heat drying operation of the heat convection circulation dryer, but also realizes the efficient heat convection drying operation of the tableware, reduces the loss of heat energy, prevents the local excessive temperature from causing heat damage to the tableware passing through, and improves the utilization rate of heat energy;

[0016] (1) The left drying fan, the heating tube assembly and the right drying fan are started by operating the remote controller to adjust the temperature inside the dryer to the required temperature. The stepper motor drives the auxiliary sprocket to rotate through the driven rod, and the auxiliary sprocket drives the driven sprocket to rotate through the linkage chain. The driven sprocket drives the transmission rod to rotate. At the same time, the transmission rod synchronously drives three sets of active sprockets to rotate, and the active sprocket drives the transmission chain to move. The support rod supports the support sprocket, and the support sprocket supports the transmission chain. The transmission chain drives multiple sets of material plates to move, and the material plates drive the tableware to move on its surface to facilitate the conveying and drying of the tableware on its surface, thereby realizing the convenient conveying and drying of tableware in the thermal convection circulation dryer;

[0017] (2) Under the drive of the left drying fan, the gas inside the drying rack enters the left air inlet hood, and is transported to the inside of the heating tube assembly by the left air duct. The heating tube assembly heats the gas, and the gas inside the heating tube assembly is discharged through the flexible air outlet hood. Under the drive of the right drying fan, the gas inside the drying rack enters the right air inlet hood, and is transported to the inside of the heating tube assembly by the right air duct. The gas is heated by the heating tube assembly, and the gas sucked into the right air inlet hood is discharged by the flexible air outlet hood. At the same time, the gas discharged from the flexible air outlet hood is sucked into the left air inlet hood and the right air inlet hood. The reciprocating operation is performed to perform a thermal convection drying operation, thereby reducing the loss of heat energy, realizing the thermal convection drying operation of the tableware by the thermal convection circulation dryer, reducing the loss of heat energy, and improving the utilization rate of heat energy;

[0018] (3) The servo motor drives the connecting arm to rotate, the connecting arm drives the linkage arm to move back and forth, the linkage arm drives the rotating arm to move back and forth through the rotating shaft, the rotating arm drives the two sets of swing arms to rotate back and forth with the clamping shaft as the axis through the rotating shaft, so as to facilitate the flexible air outlet hood to swing left and right to discharge air, so as to prevent the local high temperature from causing thermal damage to the tableware passing by, thereby realizing the convenient reciprocating swing thermal drying operation of the thermal convection circulation dryer and preventing the local high temperature from causing thermal damage to the tableware passing by. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 It is a three-dimensional enlarged structural schematic diagram of the left drying rack of the utility model;

[0021] Figure 3 It is a side view structural schematic diagram of the utility model;

[0022] Figure 4 It is a schematic diagram of the top view structure of the utility model;

[0023] Figure 5 It is a schematic diagram of the enlarged structure of the material plate of the utility model from top view;

[0024] Figure 6 It is a front view enlarged structural schematic diagram of the swing arm of the utility model;

[0025] Figure 7 It is a three-dimensional enlarged structural schematic diagram of the flexible air outlet cover of the utility model.

[0026] In the figure: 1. drying rack; 2. right air inlet cover; 3. sprocket cover; 4. connecting arm; 5. right air duct; 6. left drying fan; 7. left air duct; 8. heating tube cover; 9. heating tube assembly; 10. material plate; 11. support rod; 12. support sprocket; 13. right drying fan; 14. left drying rack; 15. right drying rack; 16. left air inlet cover; 17. swing arm; 18. stepping motor; 19. transmission rod; 20. driven sprocket; 21. linkage chain; 22. auxiliary sprocket; 23. driven rod; 24. driving sprocket; 25. transmission chain; 26. linkage arm; 27. flexible air outlet cover; 28. rotating arm; 29. ​​rotating shaft; 30. servo motor; 31. positioning frame; 32. remote controller; 33. clamping shaft. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0028] See also Figure 1-7 The utility model provides an embodiment: a heat convection circulation dryer, comprising a drying frame 1 and a sprocket cover 3, two sets of sprocket covers 3 are arranged on the outer wall of the drying frame 1, and the sprocket covers 3 are symmetrically installed, a left drying frame 14 is arranged inside the drying frame 1, a right drying frame 15 is arranged inside the drying frame 1 on one side of the left drying frame 14, a heating tube assembly 9 is installed on the top of the left drying frame 14 and the right drying frame 15, and the heating tube assembly 9 is symmetrically installed, and a heating tube outer cover 8 is arranged on the top of the heating tube assembly 9, and the heating tube assembly Three groups of left drying fans 6 are installed at equal intervals inside the drying frame 1 on one side of the component 9. The left drying fans 6 are used to accelerate the flow of gas. The side walls of the left drying fans 6 are installed with left air ducts 7, and the left air ducts 7 are connected to the heating tube assembly 9. Three groups of right drying fans 13 are installed at equal intervals inside the drying frame 1 on the other side of the heating tube assembly 9. The right drying fans 13 are used to accelerate the flow of gas. The side walls of the right drying fans 13 are installed with right air ducts 5, and the right air ducts 5 are connected to the heating tube assembly 9.

[0029] The bottom end of the left drying fan 6 is provided with a left air inlet cover 16, and the left air inlet cover 16 is fixedly connected to the left drying rack 14, and the left air inlet cover 16 extends to the inside of the drying rack 1, and the bottom end of the right drying fan 13 is provided with a right air inlet cover 2, and the right air inlet cover 2 is fixedly connected to the left drying rack 14, and the right air inlet cover 2 extends to the inside of the drying rack 1;

[0030] The left drying fan 6, the heating tube assembly 9 and the right drying fan 13 are started by operating the remote controller 32 to adjust the temperature inside the dryer to the required temperature. The stepper motor 18 is started by operating the remote controller 32. The stepper motor 18 drives the auxiliary sprocket 22 to rotate through the driven rod 23. The auxiliary sprocket 22 drives the driven sprocket 20 to rotate through the linkage chain 21. The driven sprocket 20 drives the transmission rod 19 to rotate. At the same time, the transmission rod 19 synchronously drives the three sets of active sprockets 24 to rotate. The active sprocket 24 drives the transmission chain 25 to move. The support rod 11 supports the support sprocket 12. The support sprocket 12 supports the transmission chain 25. The transmission chain 25 drives multiple groups of material plates 10 to move. The material plates 10 drive the tableware to move on its surface to facilitate the tableware on its surface to be transported and dried, thereby realizing the convenient tableware transport and drying process of the thermal convection circulation dryer.

[0031] A stepper motor 18 is installed inside the drying frame 1, and the stepper motor 18 plays a role of power drive. A driven rod 23 is installed at the output end of the stepper motor 18, and the driven rod 23 extends to the inside of the sprocket cover 3. A transmission rod 19 is arranged inside the drying frame 1 above the stepper motor 18, and the transmission rod 19 plays a role of power transmission. Both ends of the transmission rod 19 extend to the inside of the sprocket cover 3, and the surface of the transmission rod 19 is provided with three groups of active sprockets 24 with equal spacing. Two groups of auxiliary sprockets 22 are installed on the outer wall of the driven rod 23 inside the sprocket cover 3, and the auxiliary sprockets 22 are symmetrically installed;

[0032] A driven sprocket 20 is installed on the outer wall of the transmission rod 19 inside the sprocket cover 3, and the driven sprocket 20 is symmetrically installed. A linkage chain 21 is movably installed on the outer wall of the driven sprocket 20, and the linkage chain 21 extends to the surface of the auxiliary sprocket 22, and the linkage chain 21 is meshed with the driven sprocket 20 and the auxiliary sprocket 22. A transmission chain 25 is movably installed on the outer wall of the driving sprocket 24. A plurality of groups of material plates 10 with equal spacing are arranged inside the drying rack 1 above the transmission chain 25, and the material plates 10 are movably connected with the transmission chain 25. A support rod 11 is arranged inside the drying rack 1 on the side of the material plate 10 away from the transmission rod 19. The support rod 11 plays a supporting role, and the support rod 11 is symmetrically installed with the transmission rod 19. Three groups of support sprockets 12 with equal spacing are set on the outer wall of the support rod 11;

[0033] The left drying fan 6 is turned on by operating the remote controller 32. Under the drive of the left drying fan 6, the gas inside the drying rack 1 enters the left air inlet hood 16 and is transported to the interior of the heating tube assembly 9 by the left air duct 7. The heating tube assembly 9 heats the gas and the gas inside the heating tube assembly 9 is discharged through the flexible air outlet hood 27. The right drying fan 13 is turned on by operating the remote controller 32. Under the drive of the right drying fan 13, the gas inside the drying rack 1 enters the right air inlet hood 2 and is transported to the interior of the heating tube assembly 9 by the right air duct 5. The gas is heated by the heating tube assembly 9. The gas sucked into the right air inlet hood 2 is discharged by the flexible air outlet hood 27. At the same time, the gas discharged from the flexible air outlet hood 27 is sucked into the left air inlet hood 16 and the right air inlet hood 2. The reciprocating operation is performed to perform a thermal convection drying operation to reduce the loss of heat energy, thereby realizing an efficient thermal convection drying operation of the thermal convection circulation dryer on the tableware, reducing the loss of heat energy and improving the utilization rate of heat energy.

[0034] A flexible air outlet cover 27 is installed at the bottom end of the heating tube assembly 9, and a positioning frame 31 is provided at the bottom end of the left drying rack 14 on both sides of the flexible air outlet cover 27. Two sets of swing arms 17 are installed on the outer wall of the positioning frame 31, and the swing arm 17 is connected to the flexible air outlet cover 27. A clamping shaft 33 is provided on the side of the swing arm 17 close to the positioning frame 31, and the swing arm 17 is movably connected to the positioning frame 31 through the clamping shaft 33, and the clamping shaft 33 plays the role of active support. A rotating arm 28 is provided between the two sets of swing arms 17 above the positioning frame 31, and a rotating shaft 29 is provided on the side of the rotating arm 28 close to the swing arm 17, and the rotating arm 28 The rotating shaft 29 is movably connected to the swing arm 17, and the rotating shaft 29 plays the role of active support. The outer wall of the positioning frame 31 is equipped with a servo motor 30, and the servo motor 30 plays the role of power drive. The output end of the servo motor 30 is equipped with a connecting arm 4, and the top of the connecting arm 4 is movably equipped with a linkage arm 26, and the linkage arm 26 is movably connected to the rotating arm 28 through the rotating shaft 29. A remote controller 32 is installed on the outer wall of the drying machine frame 1, and the output end of the remote controller 32 is electrically connected to the stepping motor 18, the left drying fan 6, the right drying fan 13, the heating tube assembly 9, and the input end of the servo motor 30;

[0035] The servo motor 30 is started by operating the remote controller 32, and the servo motor 30 drives the connecting arm 4 to rotate, and the connecting arm 4 drives the linkage arm 26 to reciprocate, and the linkage arm 26 drives the rotating arm 28 to reciprocate through the rotating shaft 29, and the rotating arm 28 drives the two sets of swing arms 17 to reciprocate around the clamping shaft 33 through the rotating shaft 29, so as to facilitate the flexible air outlet hood 27 to swing left and right to exhaust air, so as to prevent the local high temperature from causing thermal damage to the passing tableware, thereby realizing the convenient reciprocating swinging heat drying operation of the thermal convection circulation dryer, and preventing the local high temperature from causing thermal damage to the passing tableware.

[0036] Working principle: When in use, an external power source is first used to drive the auxiliary sprocket 22 to rotate through the stepper motor 18 via the driven rod 23, and the auxiliary sprocket 22 drives the driven sprocket 20 to rotate through the linkage chain 21, and the driven sprocket 20 drives the transmission rod 19 to rotate. At the same time, the transmission rod 19 synchronously drives the three sets of active sprockets 24 to rotate, and the active sprocket 24 drives the transmission chain 25 to move, and the transmission chain 25 drives multiple sets of material plates 10 to move, and the material plates 10 drive the tableware to move on its surface to facilitate the transportation and drying of the tableware on its surface. Driven by the multiple sets of material plates 10, the tableware inside the dryer moves to the bottom of the heating tube assembly 9. Driven by the left drying fan 6, the gas inside the drying frame 1 enters the left air inlet hood 16 and is transported to the inside of the heating tube assembly 9 by the left air duct 7. The heating tube assembly 9 heats the gas, and the gas inside the heating tube assembly 9 passes through the flexible air outlet hood 2 7 is discharged. Driven by the right drying fan 13, the gas inside the drying machine frame 1 enters the inside of the right air inlet hood 2, and the right air duct 5 transports the gas to the inside of the heating tube assembly 9, and the heating tube assembly 9 heats the gas. The gas sucked in by the right air inlet hood 2 is discharged by the flexible air outlet hood 27. At the same time, the gas discharged by the flexible air outlet hood 27 is sucked by the left air inlet hood 16 and the right air inlet hood 2, and reciprocates to perform thermal convection drying operation to reduce the loss of heat energy. The servo motor 30 drives the connecting arm 4 to rotate, and the connecting arm 4 drives the linkage arm 26 to move back and forth. The linkage arm 26 drives the rotating arm 28 to move back and forth through the rotating shaft 29. The rotating arm 28 drives the two sets of swing arms 17 to rotate back and forth with the clamping shaft 33 as the axis through the rotating shaft 29, so as to facilitate the flexible air outlet hood 27 to swing left and right to discharge air, so as to prevent the local temperature from being too high and causing thermal damage to the tableware passing through, so as to complete the use of the dryer.

[0037] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A convection circulation dryer, comprising a drying frame (1) and a sprocket cover (3), characterized in that: Two sets of sprocket covers (3) are arranged on the outer wall of the drying machine frame (1), and the sprocket covers (3) are symmetrically installed. A left drying rack (14) is arranged inside the drying machine frame (1), and a right drying rack (15) is arranged inside the drying machine frame (1) on the side of the left drying rack (14). A heating tube assembly (9) is installed on the top of the left drying rack (14) and the right drying rack (15), and the heating tube assembly (9) is symmetrically installed. A heating tube outer cover (8) is arranged on the top of the heating tube assembly (9). Three groups of left drying fans (6) are installed at equal intervals inside the drying machine frame (1) on one side of the heat pipe assembly (9), and left air ducts (7) are installed on the side walls of the left drying fans (6), and the left air ducts (7) are connected to the heating pipe assembly (9). Three groups of right drying fans (13) are installed at equal intervals inside the drying machine frame (1) on the other side of the heating pipe assembly (9), and right air ducts (5) are installed on the side walls of the right drying fans (13), and the right air ducts (5) are connected to the heating pipe assembly (9).

2. A thermal convection circulation drying machine according to claim 1, characterized in that: The bottom end of the left drying fan (6) is provided with a left air inlet cover (16), and the left air inlet cover (16) is fixedly connected to the left drying rack (14), and the left air inlet cover (16) extends to the inside of the drying rack (1); the bottom end of the right drying fan (13) is provided with a right air inlet cover (2), and the right air inlet cover (2) is fixedly connected to the left drying rack (14), and the right air inlet cover (2) extends to the inside of the drying rack (1).

3. A thermal convection circulation drying machine according to claim 1, characterized in that: A stepper motor (18) is installed inside the drying machine frame (1), a driven rod (23) is installed at the output end of the stepper motor (18), and the driven rod (23) extends to the inside of the sprocket cover (3), a transmission rod (19) is arranged inside the drying machine frame (1) above the stepper motor (18), and both ends of the transmission rod (19) extend to the inside of the sprocket cover (3), and three groups of driving sprockets (24) with equal spacing are mounted on the surface of the transmission rod (19), and two groups of auxiliary sprockets (22) are installed on the outer wall of the driven rod (23) inside the sprocket cover (3), and the auxiliary sprockets (22) are symmetrically installed.

4. A thermal convection circulation drying machine according to claim 3, characterized in that: A driven sprocket (20) is mounted on the outer wall of the transmission rod (19) inside the sprocket cover (3), and the driven sprocket (20) is mounted symmetrically. A linkage chain (21) is movably mounted on the outer wall of the driven sprocket (20), and the linkage chain (21) extends to the surface of the auxiliary sprocket (22), and the linkage chain (21) is meshed with the driven sprocket (20) and the auxiliary sprocket (22). A transmission chain (25) is movably mounted on the outer wall of the driving sprocket (24).

5. A thermal convection circulation drying machine according to claim 4, characterized in that: A plurality of groups of material plates (10) with equal spacing are arranged inside the drying machine frame (1) above the transmission chain (25), and the material plates (10) are movably connected to the transmission chain (25). A support rod (11) is arranged inside the drying machine frame (1) on the side of the material plate (10) away from the transmission rod (19), and the support rod (11) is symmetrically installed with the transmission rod (19), and three groups of support sprockets (12) with equal spacing are mounted on the outer wall of the support rod (11).

6. A thermal convection circulation drying machine according to claim 1, characterized in that: The bottom end of the heating tube assembly (9) is provided with a flexible air outlet cover (27), and the bottom ends of the left drying racks (14) on both sides of the flexible air outlet cover (27) are provided with positioning frames (31). Two groups of swing arms (17) are installed on the outer wall of the positioning frame (31), and the swing arms (17) are connected to the flexible air outlet cover (27). A clamping shaft (33) is provided on one side of the swing arm (17) close to the positioning frame (31), and the swing arm (17) is movably connected to the positioning frame (31) via the clamping shaft (33).

7. A thermal convection circulation drying machine according to claim 6, characterized in that: A rotating arm (28) is arranged between the two groups of swing arms (17) above the positioning frame (31); a rotating shaft (29) is arranged on one side of the rotating arm (28) close to the swing arm (17); and the rotating arm (28) is movably connected to the swing arm (17) via the rotating shaft (29); a servo motor (30) is installed on the outer wall of the positioning frame (31); a connecting arm (4) is installed at the output end of the servo motor (30); a linkage arm (26) is movably installed at the top end of the connecting arm (4); and the linkage arm (26) is movably connected to the rotating arm (28) via the rotating shaft (29).

8. A thermal convection circulation drying machine according to claim 1, characterized in that: A remote controller (32) is installed on the outer wall of the drying machine frame (1), and the output end of the remote controller (32) is electrically connected to the input end of the stepper motor (18), the left drying fan (6), the right drying fan (13), the heating tube assembly (9), and the servo motor (30).

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