Hot air circulation energy-saving drying device

Abstract

The utility model discloses a hot air circulation energy-saving drying device. Comprising a cyclic heating air supply mechanism, a hot air circulation mechanism and an adjustable drying air outlet mechanism, the cyclic heating air supply mechanism is combined with the hot air circulation mechanism, and an air supply pipe on the outer side of the hot air circulation mechanism is combined with an air inlet pipe of the adjustable drying air outlet mechanism. The circulating heating air supply mechanism comprises an air inlet and return regulation and control chamber, a combustion heating chamber and a hot air supply chamber which are sequentially connected and combined, the hot air circulation mechanism comprises a hot air supply pipeline and a return air circulation pipeline, and the hot air supply pipeline is connected with a hot air supply pipe of the hot air supply chamber. The drying device has the advantages that an air circulation structure formed by combining the circulating heating air supply mechanism, the hot air circulation mechanism and the adjustable drying air outlet mechanism is adopted, hot air in the drying process can be effectively recycled, the effects of energy conservation, emission reduction and environmental protection are achieved, and the drying device further has the advantages of being reasonable in structural design, convenient to operate and debug, low in cost and the like. And hot air conveying is stable and rapid, practicability is good, and universality is high.

Description

Technical Field

[0001] The utility model relates to the technical field of drying equipment structures, and more specifically, to a hot air circulation energy-saving drying device. Background Art

[0002] Ceramic products are made of natural mineral raw materials such as clay, quartz, feldspar, etc. through multiple steps such as crushing, mixing, molding, firing, drying, and coloring to form finished products with different functions. The prepared ceramic products have the advantages of high temperature resistance, easy cleaning, high hardness, etc., and are widely used in furniture, daily life utensils and other living fields.

[0003] Drying of ceramic blanks is an important process in the manufacturing process of ceramic products. Ceramic blanks need to be dried after the initial firing. Since the ceramic blanks still have a very high temperature after firing, it takes a long time to cool naturally. In addition, the ceramic blanks are prone to cracking during the natural cooling process, which affects the quality of the finished product. At present, the main drying method for ceramic blanks is air blowing cooling. The purpose of drying is achieved by continuously blowing hot air to the ceramic blanks. However, the existing drying equipment adopts a direct blowing structure, which has high energy consumption. The hot air after blowing and drying is directly diffused in the air and cannot be effectively utilized, which will cause a large amount of energy waste and pollute the production environment. In addition, due to the variety of styles of ceramic products, different products have different requirements for drying. The direct blowing structure cannot meet the diverse drying requirements of different ceramic products.

[0004] Therefore, it is necessary to propose a new ceramic drying structure that can both save energy and reduce emissions and meet the production needs of different ceramic products. Utility Model Content

[0005] The purpose of the utility model is to solve the deficiencies existing in the use of the above-mentioned existing ceramic drying equipment and to provide a hot air circulation energy-saving drying device which is energy-saving, highly efficient, environmentally friendly, widely applicable and highly practical.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A hot air circulation energy-saving drying device comprises a circulating heating air supply mechanism, a hot air circulation mechanism and an adjustable drying air outlet mechanism. The circulating heating air supply mechanism is used to extract air and heat the air for transportation and to circulate and heat the hot air with heat after drying and to circulate and transport it. The hot air circulation mechanism is used to guide and transport the hot air and circulate and recover the hot air. The adjustable drying air outlet mechanism is used to dry the product and provide a corresponding drying method in combination with the drying requirements of the product. The circulating heating air supply mechanism is combined with the hot air circulation mechanism, the air supply pipe on the outside of the hot air circulation mechanism is combined with the air inlet pipe of the adjustable drying air outlet mechanism, a drying bracket is provided on the outside of the hot air circulation mechanism, the adjustable drying air outlet mechanism is installed on the drying bracket, and the drying outlet of the adjustable drying air outlet mechanism is arranged downward, the circulating heating air supply mechanism comprises an air inlet and return air control chamber, a combustion heating chamber and a hot air supply chamber which are sequentially connected and combined, the hot air circulation mechanism comprises a hot air supply duct and a return air circulation duct, the hot air supply duct is connected with the hot air supply duct of the hot air supply chamber, a hot air return opening is opened on the outside of the return air circulation duct, the return air circulation duct is connected with the hot air return duct of the air inlet and return air control chamber, an air inlet regulating structure is provided on the outside of the air inlet and return air control chamber, and the air inlet regulating structure is used to control and regulate the air volume sucked in from the air inlet and return air control chamber. The combustion heating chamber is connected and combined with the combustion structure, the hot air supply chamber is provided with an air supply structure, and the hot air return opening is located below the drying air outlet.

[0008] Preferably, a return air volume adjustment structure is provided on the outer side of the hot air return opening, and the return air volume adjustment structure is used to adjust and control the return air volume of the hot air after drying. The return air volume adjustment structure includes a sliding adjustment frame and a return air adjustment baffle, the sliding adjustment frame is arranged on the outer side of the hot air return opening, and an adjustment locking component is provided on the sliding adjustment frame, and the locking end of the adjustment locking component is locked with the front end surface of the return air adjustment baffle.

[0009] Preferably, the air inlet adjustment structure includes an air inlet and an air inlet volume adjustment plate arranged on the outside of the air inlet and return air control chamber. The air inlet volume adjustment plate is rotatably installed in the air inlet through a central rotating shaft, and the protruding end of the central rotating shaft is connected to the adjustment connecting rod of the air inlet adjustment cylinder installed on the outside of the air inlet.

[0010] Preferably, an air inlet and air supply structure is further provided on the outside of the air inlet and return air control chamber, and the air inlet and air supply structure is used to inhale natural wind to supplement oxygen to improve combustion efficiency and provide more air intake when a higher hot air supply volume is required. The air inlet and air supply structure includes an air supply opening provided on the outside of the air inlet and return air control chamber, an air supply screen is provided on the outside of the air supply opening, and an air supply adjustment baffle is slidably provided between the air supply opening and the air supply screen.

[0011] Preferably, a grip is provided at the outer end of the air supply regulating baffle, and the operator can safely and quickly operate the air supply regulating baffle through the grip according to production requirements to control the amount of air supply entering the air inlet and return air control room from the air supply opening.

[0012] Preferably, a hot air return air regulating structure is provided in the hot air return air duct, and the hot air return air regulating structure is used to regulate and control the amount of hot air sent back from the return air circulation duct according to production requirements. The hot air return air regulating structure includes a hot air return air baffle slidably installed in the hot air return air regulating groove, and the hot air return air baffle is provided with a sliding guide groove, and the sliding guide groove cooperates with the guide piece outside the hot air return air regulating groove.

[0013] Preferably, an air guide is provided below the air inlet duct of the adjustable drying air outlet mechanism, and the air guide guide guides the air entering from the air inlet duct to flow smoothly to the drying air outlet below. A concentrated air guide is provided in the air inlet duct, and a rotating concentrated air volume adjustment baffle is provided in the middle of the concentrated air guide. A sliding diversion baffle is provided transversely in the air inlet duct, and the sliding diversion baffle is arranged on both sides of the outer wall of the concentrated air guide. A concentrated air guide fitting groove is provided on the inner edge of the sliding diversion baffle, and the concentrated air guide fitting groove cooperates with the outer wall of the concentrated air guide. The rotating concentrated air volume adjustment baffle and the sliding diversion baffle are used to control the flow path of the airflow in the air guide. The drying air outlet includes a concentrated air outlet and a diffused air outlet at the lower end of the concentrated air guide.

[0014] Preferably, the concentrated wind outlet is extended out of the lower end surface of the air guide portion, the diffused wind outlet is arranged on the lower end surface of the air guide portion, and the diffused wind outlet is arranged in a circular array outside the concentrated wind outlet.

[0015] Preferably, fixed mounting plates are provided on both sides of the air guide portion, a locking slide hole is provided in the middle of the fixed mounting plate, the drying air outlet is installed on the drying bracket through a locking member passing through the locking slide hole and the mounting hole on the drying bracket, and the locking slide hole and the locking member are slidably adjusted. During installation, the installation position of the adjustable drying air outlet mechanism can be adjusted according to actual production needs.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The utility model adopts an air circulation structure that combines a circulating heating air supply mechanism, a hot air circulation mechanism and an adjustable drying air outlet mechanism, which can effectively recycle the hot air in the drying process, play a role in energy conservation and emission reduction, and the blown hot air can also be effectively recycled and reused, which will not pollute the production environment. At the same time, it reduces the energy consumption required for heating in the drying process, and achieves better energy-saving and environmental protection effects. The utility model is provided with a multi-stage adjustable air inlet and return air control structure on the drying device, which can effectively adjust the drying air volume and the size of the circulating recovery air volume according to different production requirements, provide a reasonable drying effect, and further play a role in energy conservation. The utility model adopts a variable air outlet structure in the adjustable drying air outlet mechanism, which can provide different drying air outlet options during production to meet the drying requirements of different ceramic products. The utility model has the advantages of reasonable structural design, convenient operation and debugging, stable and fast hot air delivery, good practicality, and strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the utility model.

[0020] Figure 3 It is a schematic diagram of the hot air circulation mechanism of the utility model.

[0021] Figure 4 It is a schematic diagram of the circulating heating and air supply mechanism of the utility model.

[0022] Figure 5 It is a schematic diagram of the circulating heating and air supply mechanism of the utility model.

[0023] Figure 6 It is a schematic diagram of the adjustable drying air outlet mechanism of the utility model.

[0024] Figure 7 It is a schematic diagram of the internal structure of the adjustable drying air outlet mechanism of the utility model.

[0025] Description of Figure Numbers:

[0026] Circulating heating air supply mechanism-1, hot air circulation mechanism-2, adjustable drying air outlet mechanism-3, air supply duct-4, air inlet duct-5, drying bracket-6, air inlet and return air control chamber-7, combustion heating chamber-8, hot air supply chamber-9, hot air supply duct-10, return air circulation duct-11, hot air return air opening-12, hot air return air duct-13, air inlet adjustment structure-14, drying air outlet-15, return air volume adjustment structure-16, sliding adjustment frame-17, return air adjustment baffle-18, adjustment locking component-19, air inlet-20, air inlet volume adjustment plate-21, central rotating shaft- 22, air inlet regulating cylinder-23, air inlet and air supply structure-24, air supply opening-25, air supply screen-26, air supply regulating baffle-27, gripping part-28, hot air return air regulating structure-29, hot air return air baffle-30, hot air return air regulating slot-31, sliding guide slot-32, air guide part-33, concentrated air guide duct-34, rotating concentrated air volume regulating baffle-35, sliding diversion baffle-36, concentrated air guide duct fitting slot-37, concentrated air outlet-38, diffused air outlet-39, fixed mounting plate-40, locking slide hole-41, hot air supply duct-42. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] The present invention is further described below with reference to specific embodiments and accompanying drawings:

[0030] In an embodiment, Figures 1 to 7It is a schematic diagram of each structure of the utility model. Further, the utility model is a hot air circulation energy-saving drying device, including a circulating heating air supply mechanism 1, a hot air circulation mechanism 2 and an adjustable drying air outlet mechanism 3. The circulating heating air supply mechanism 1 is used to extract air and heat the air for transportation and circulate and heat the hot air with heat after drying and circulate and transport it. The hot air circulation mechanism 2 is used to guide and transport the hot air and circulate and recover the hot air. The adjustable drying air outlet mechanism 3 is used to dry the product and provide a corresponding drying method in combination with the drying requirements of the product. The circulating heating air supply mechanism 1 is combined with the hot air circulation mechanism 2, and the air supply pipe 4 on the outside of the hot air circulation mechanism 2 is combined with the air inlet pipe 5 of the adjustable drying air outlet mechanism 3. A drying bracket 6 is provided on the outside of the hot air circulation mechanism 2, and the adjustable drying air outlet mechanism 3 is installed on the drying bracket 6. The drying air outlet 15 of the adjustable drying air outlet mechanism 3 is set downward, and the circulating heating air supply mechanism 1 includes an air inlet and return air control chamber 7, a combustion heating chamber 8 and a hot air supply chamber connected and combined in sequence. 9, the hot air circulation mechanism 2 includes a hot air supply duct 10 and a return air circulation duct 11, the hot air supply duct 10 is connected to the hot air supply duct 42 of the hot air supply chamber 9, the return air circulation duct 11 is provided with a hot air return opening 12 on the outside, the return air circulation duct 11 is connected to the hot air return duct 13 of the air inlet and return air control chamber 7, the air inlet regulating structure 14 is provided on the outside of the air inlet and return air control chamber 7, and the air inlet regulating structure 14 is used to control and regulate the air volume sucked from the air inlet and return air control chamber 7. The combustion heating chamber 8 is connected and combined with the combustion structure, the hot air supply chamber 9 is provided with an air supply structure, and the hot air return opening 12 is arranged below the drying outlet 15.

[0031] Preferably, a return air volume adjustment structure 16 is provided on the outside of the hot air return opening 12, and the return air volume adjustment structure 16 is used to adjust and control the return air volume of the hot air after drying. The return air volume adjustment structure 16 includes a sliding adjustment frame 17 and a return air adjustment baffle 18, the sliding adjustment frame 17 is arranged on the outside of the hot air return opening 12, and an adjustment locking component 19 is provided on the sliding adjustment frame 17, and the locking end of the adjustment locking component 19 is locked with the front end surface of the return air adjustment baffle 18.

[0032] Preferably, the air inlet adjustment structure 14 includes an air inlet 20 and an air inlet volume adjustment plate 21 arranged on the outside of the air inlet and return air control chamber 7, and the air inlet volume adjustment plate 21 is rotatably installed in the air inlet 20 through a central rotating shaft 22, and the protruding end of the central rotating shaft 22 is connected to the adjustment connecting rod of the air inlet adjustment cylinder 23 installed on the outside of the air inlet 20.

[0033] Preferably, an air inlet and air supply structure 24 is further provided on the outside of the air inlet and return air control chamber 7, and the air inlet and air supply structure 24 is used to inhale natural wind to supplement oxygen to improve combustion efficiency and provide more air intake when a higher hot air supply volume is required. The air inlet and air supply structure 24 includes an air supply opening 25 provided on the outside of the air inlet and return air control chamber 7, and an air supply screen 26 is provided on the outside of the air supply opening 25, and an air supply adjustment baffle 27 is slidably provided between the air supply opening 25 and the air supply screen 26.

[0034] Preferably, a gripping portion 28 is provided at the outer end of the air supply regulating baffle 27, and the operator can safely and quickly operate the air supply regulating baffle 27 through the gripping portion 28 according to production requirements to control the amount of air supply entering the air inlet and return air control chamber 7 from the air supply opening 25.

[0035] Preferably, a hot air return air regulating structure 29 is provided in the hot air return air duct 13, and the hot air return air regulating structure 29 is used to regulate and control the amount of hot air sent back from the return air circulation duct 11 according to production requirements. The hot air return air regulating structure 29 includes a hot air return air baffle 30 slidably installed in a hot air return air regulating groove 31, and a sliding guide groove 32 is opened on the hot air return air baffle 30, and the sliding guide groove 32 cooperates with a guide member outside the hot air return air regulating groove 31.

[0036] Preferably, an air guide 33 is provided below the air inlet duct 5 of the adjustable drying air outlet mechanism 3, and the air guide 33 guides the air entering from the air inlet duct 5 to flow smoothly to the drying air outlet 15 below. A concentrated air guide duct 34 is provided in the air inlet duct 5, and a rotating concentrated air volume adjustment baffle 35 is provided in the middle of the concentrated air guide duct 34. A sliding diversion baffle 36 is transversely provided in the air inlet duct 5, and the sliding diversion baffle 36 is arranged on both sides of the outer wall of the concentrated air guide duct 34. A concentrated air guide duct fitting groove 37 is opened on the inner edge of the sliding diversion baffle 36, and the concentrated air guide duct fitting groove 37 cooperates with the outer wall of the concentrated air guide duct 34. The rotating concentrated air volume adjustment baffle 35 and the sliding diversion baffle 36 are used to control the flow path of the airflow in the air guide 33. The drying air outlet 15 includes a concentrated air outlet 38 and a diffused air outlet 39 at the lower end of the concentrated air guide duct 34.

[0037] Preferably, the concentrated wind outlet 38 is extended out of the lower end surface of the wind guide portion 33, the diffused wind outlet 39 is arranged on the lower end surface of the wind guide portion 33, and the diffused wind outlet 39 is arranged in a ring array outside the concentrated wind outlet 38.

[0038] Preferably, fixed mounting plates 40 are provided on both sides of the air guide portion 33, a locking slide hole 41 is provided in the middle of the fixed mounting plate 40, the drying air outlet 15 is installed on the drying bracket 6 by a locking member passing through the locking slide hole 41 and the mounting hole on the drying bracket 6, and the locking slide hole 41 and the locking member are slidably adjusted. During installation, the installation position of the adjustable drying air outlet mechanism 3 can be adjusted according to actual production needs.

[0039] First embodiment:

[0040] The implementation process of this embodiment is as follows: when drying ceramic products, the equipment is started and the circulating heating and air supply mechanism 1 works. The air inlet regulating cylinder 23 controls the opening of the air inlet volume regulating plate 21 through the central rotating shaft 22, so that the air inlet 20 is in a fully open state, and the air supply structure in the hot air supply chamber 9 performs suction and air supply, and sucks the external air into the air inlet and return air control chamber 7 through the air inlet 20, and the air temperature is increased by heating of the combustion structure of the combustion heating chamber 8 until the air is heated to the preset required drying temperature, and the air supply structure in the hot air supply chamber 9 transports the heated air to the connected hot air supply duct 10, and the hot air is blown downward through the drying air outlet 15, and the ceramic blank transported below is subjected to hot air blowing and drying treatment by the adjustable drying air outlet mechanism 3, and the excess hot air after blowing passes through the hot air return opening 12 on the outer side of the return air circulation duct 11 and is circulated and sucked into the air inlet and return air control chamber 7 from the hot air return duct 13 of the air inlet and return air control chamber 7, and is heated by the combustion heating chamber 8 again so that the heat can be recycled, thereby reducing the energy consumption of the combustion structure.

[0041] Second embodiment:

[0042] This embodiment is similar to the first embodiment, except that, during the implementation of this embodiment, the air inlet and air supply structure 24 on the outside of the air inlet and return air control chamber 7 is opened, and the air supply adjustment baffle 27 is pulled outward to open the air supply opening 25, so that more air from the outside can be sucked into the air inlet and return air control chamber 7 from the air supply opening 25, providing more oxygen to the combustion and heating chamber 8, making the combustion of the combustion and heating chamber 8 more complete, improving the combustion efficiency, and allowing the combustion and heating chamber 8 to provide more sufficient hot air to the hot air supply duct 10, achieving a higher drying temperature with the same energy consumption, and achieving a more ideal drying effect. Large impurities in the air will be intercepted by the air supply screen 26 set outside the air supply opening 25 to ensure the normal operation of the equipment and the blowing and drying effect.

[0043] Third embodiment:

[0044] This embodiment is similar to the first embodiment, except that, during the implementation of this embodiment, when drying cylindrical ceramic embryos or ceramic embryos that need to be dried centrally, the sliding diversion baffle 36 of the adjustable drying air outlet mechanism 3 can be closed to the middle, and the rotating centralized air volume adjustment baffle 35 can be opened to allow hot air to be blown out directly from the centralized air outlet 38 through the centralized air guide duct 34 to perform centralized drying on the ceramic embryos below.

[0045] Fourth embodiment:

[0046] This embodiment is similar to the first embodiment, except that, during the implementation of this embodiment, when drying flat ceramic bodies or ceramic bodies that need to be dried over a large area, the rotating concentrated air volume adjustment baffle 35 can be closed and the sliding diversion baffle 36 can be opened to allow hot air to be blown out from the diffusion air outlet 39 through the air guide portion 33 to evenly diffuse and dry the ceramic bodies below.

[0047] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A hot air circulation energy-saving drying device, characterized in that: The invention comprises a circulating heating air supply mechanism (1), a hot air circulation mechanism (2) and an adjustable drying air outlet mechanism (3), wherein the circulating heating air supply mechanism (1) is combined with the hot air circulation mechanism (2), an air supply pipe (4) on the outside of the hot air circulation mechanism (2) is combined with an air inlet pipe (5) of the adjustable drying air outlet mechanism (3), a drying bracket (6) is provided on the outside of the hot air circulation mechanism (2), the adjustable drying air outlet mechanism (3) is mounted on the drying bracket (6), and a drying air outlet (15) of the adjustable drying air outlet mechanism (3) is arranged downward, and the circulating heating air supply mechanism (1) comprises an air inlet and return air control chamber (7), a combustion heating chamber (8) and a hot air supply chamber (9) which are connected and combined in sequence. ), the hot air circulation mechanism (2) comprises a hot air supply duct (10) and a return air circulation duct (11); the hot air supply duct (10) is connected to the hot air supply duct (42) of the hot air supply chamber (9); a hot air return opening (12) is provided on the outer side of the return air circulation duct (11); the return air circulation duct (11) is connected to the hot air return duct (13) of the air inlet and return air control chamber (7); an air inlet regulating structure (14) is provided on the outer side of the air inlet and return air control chamber (7); the combustion heating chamber (8) is connected and combined with the combustion structure; an air supply structure is provided in the hot air supply chamber (9); and the hot air return opening (12) is provided below the drying air outlet (15).

2. The hot air circulation energy-saving drying device according to claim 1, characterized in that: A return air volume adjustment structure (16) is provided on the outer side of the hot air return opening (12), and the return air volume adjustment structure (16) comprises a sliding adjustment frame (17) and a return air adjustment baffle (18). The sliding adjustment frame (17) is arranged on the outer side of the hot air return opening (12), and an adjustment locking component (19) is provided on the sliding adjustment frame (17). The locking end of the adjustment locking component (19) is in locking engagement with the front end surface of the return air adjustment baffle (18).

3. The hot air circulation energy-saving drying device according to claim 1, characterized in that: The air intake adjustment structure (14) comprises an air intake port (20) and an air intake air volume adjustment plate (21) arranged outside the air intake and return air control chamber (7); the air intake air volume adjustment plate (21) is rotatably mounted in the air intake port (20) via a central rotating shaft (22); and the protruding end of the central rotating shaft (22) is connected to an adjustment connecting rod of an air intake adjustment cylinder (23) mounted outside the air intake port (20).

4. The hot air circulation energy-saving drying device according to claim 1, characterized in that: An air inlet and air supply structure (24) is also provided on the outside of the air inlet and return air control chamber (7), and the air inlet and air supply structure (24) comprises an air supply opening (25) provided on the outside of the air inlet and return air control chamber (7), an air supply screen (26) is provided on the outside of the air supply opening (25), and an air supply adjustment baffle (27) is slidably provided between the air supply opening (25) and the air supply screen (26).

5. The hot air circulation energy-saving drying device according to claim 4, characterized in that: A gripping portion (28) is provided at the outer end of the air supply adjustment baffle (27).

6. The hot air circulation energy-saving drying device according to claim 1, characterized in that: A hot air return air regulating structure (29) is provided in the hot air return air duct (13), and the hot air return air regulating structure (29) comprises a hot air return air baffle (30) slidably mounted in the hot air return air regulating groove (31), and a sliding guide groove (32) is formed on the hot air return air baffle (30), and the sliding guide groove (32) cooperates with a guide member on the outside of the hot air return air regulating groove (31).

7. The hot air circulation energy-saving drying device according to claim 1, characterized in that: An air guide portion (33) is provided below the air inlet duct (5) of the adjustable drying air outlet mechanism (3); a concentrated air guide duct (34) is provided inside the air inlet duct (5); a rotating concentrated air volume adjustment baffle (35) is provided in the middle of the concentrated air guide duct (34); a sliding diversion baffle (36) is provided laterally inside the air inlet duct (5); the sliding diversion baffle (36) is provided on both sides of the outer wall of the concentrated air guide duct (34); a concentrated air guide duct fitting groove (37) is provided on the inner edge of the sliding diversion baffle (36); the concentrated air guide duct fitting groove (37) cooperates with the outer wall of the concentrated air guide duct (34); and the drying air outlet (15) comprises a concentrated air outlet (38) and a diffused air outlet (39) at the lower end of the concentrated air guide duct (34).

8. The hot air circulation energy-saving drying device according to claim 7, characterized in that: The concentrated air outlet (38) is arranged to extend out of the lower end surface of the air guide portion (33), the diffuse air outlet (39) is arranged on the lower end surface of the air guide portion (33), and the diffuse air outlet (39) is arranged in a circular array outside the concentrated air outlet (38).

9. The hot air circulation energy-saving drying device according to claim 7, characterized in that: Fixed mounting plates (40) are provided on both sides of the air guide portion (33), a locking slide hole (41) is provided in the middle of the fixed mounting plate (40), the drying air outlet (15) is installed on the drying bracket (6) by means of a locking piece passing through the locking slide hole (41) and in combination with a mounting hole on the drying bracket (6), the locking slide hole (41) and the locking piece being in sliding adjustment cooperation.

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