Energy-saving stable hot air drying equipment and using method thereof

Abstract

The invention relates to the technical field of drying equipment, and provides energy-saving and stable hot air drying equipment which comprises a drying box, an air supply mechanism is arranged on the outer side of the drying box and comprises a shell, a fan is fixedly installed at the top end of the inner side of the shell, and an air return pipe is fixedly connected to the inlet end of the fan. The outlet end of the fan is fixedly connected with an air supply pipe, the outlet end of the air supply pipe is fixedly connected with a mounting box, the inner side of the mounting box is fixedly connected with a plurality of electric heating wires, the outlet end of the mounting box is fixedly connected with a hot air guide pipe, and the outlet end of the hot air guide pipe is communicated with the air inlet end of the drying box. A fresh air pipe is fixedly connected to the outer side of the air return pipe, and a first air valve used for controlling the air volume of the fresh air pipe is fixedly connected to the fresh air pipe. Fresh air can be guided in through the fresh air pipe, the humidity in hot air circulation is kept or reduced, and therefore the drying effect is kept or improved.

Description

Technical Field

[0001] The present invention relates to the technical field of drying equipment, and in particular to energy-saving and stable hot air drying equipment and a use method thereof. Background Art

[0002] Hot air drying equipment is mainly composed of a blower, a heater, a control circuit and other parts. The blower is used to blow air, the heater heats the air, and the control circuit is responsible for adjusting parameters such as temperature and air volume. The working principle of hot air drying equipment is relatively simple. After power is turned on, the blower blows air into the heater, so that the air passes evenly from the inside and outside of the spiral heating wire. The heat generated by the heating wire after power is turned on exchanges heat with the cold air passing through, thereby increasing the air temperature at the outlet.

[0003] After searching, the Chinese patent (publication number: CN110940156A) disclosed "an energy-saving hot air circulation drying equipment, including a drying box, which is divided into a drying chamber, a heat exchange chamber and an air inlet chamber from top to bottom by two upper and lower partition plates, and a number of air holes are evenly arranged on the partition plates; a drying rack is arranged in the drying chamber, and a heating component is arranged in the heat exchange chamber; an air outlet duct is arranged on the top of the drying chamber, and the air outlet duct is connected with the air inlet of the return fan through a hot air return pipe, and the air outlet of the return fan is connected with the air inlet chamber; two heating boxes are arranged on the left and right sides of the heat exchange chamber, and a plurality of heat exchange carbon fiber bundles extending in the transverse direction are arranged side by side between the two heating boxes, and an electric heating pipe is arranged in the heating box, and both ends of the heat exchange carbon fiber bundles extend into the heating box and form heat exchange with the electric heating pipe."

[0004] However, in the process of implementing relevant technologies, this type of patent has certain technical defects. Among them, the hot air drying equipment of this type of patent has only an exhaust port, and no fresh air port is added. When the humidity of the object to be dried by hot air is relatively high, since there is no fresh air port, no fresh air is added to the original hot air cycle, which will make the humidity in the hot air cycle higher and higher, and greatly reduce the drying effect of the equipment. Ultimately, not only the drying effect cannot be achieved, but also the energy loss will increase, resulting in a waste of resources. In view of this, the present invention proposes an energy-saving and stable hot air drying equipment and a method for using the same. Summary of the invention

[0005] The invention provides an energy-saving and stable hot air drying device and a use method thereof, which solves the problem of high humidity in hot air circulation in the prior art.

[0006] The technical solution of the present invention is as follows: an energy-saving and stable hot air drying equipment, comprising a drying box, an air supply mechanism is arranged on the outside of the drying box, the air supply mechanism comprises a shell, a fan is fixedly installed on the top of the inner side of the shell, the inlet end of the fan is fixedly connected with a return air duct, the inlet end of the return air duct is connected with the air outlet end of the drying box, the outlet end of the fan is fixedly connected with an air supply duct, the outlet end of the air supply duct is fixedly connected with an installation box, a plurality of electric heating wires are fixedly connected to the inside of the installation box, the outlet end of the installation box is fixedly connected with a hot air guide duct, the outlet end of the hot air guide duct is connected with the air inlet end of the drying box, the outside of the return air duct is fixedly connected with a fresh air duct, and the fresh air duct is fixedly connected with a first air valve for controlling the air volume of the fresh air duct.

[0007] Preferably, a drying chamber is provided at the bottom end of the inner side of the drying box, a cooling chamber is provided at the top end of the inner side of the drying box, a through air guide groove is provided between the cooling chamber and the drying chamber, a heat exchange pipe is fixedly connected to the inner side of the cooling chamber, the outlet end of the heat exchange pipe is connected to the fresh air duct, a double-axis motor is fixedly installed on the outer side of the drying box, a suction mechanism is provided at the inlet end of the heat exchange pipe for introducing fresh air into the heat exchange pipe by cooperating with the start of the double-axis motor, a drying mechanism is provided on the inner side of the drying chamber for drying the material by cooperating with the start of the double-axis motor, an exhaust duct is fixedly connected to one end of the drying chamber, and a second air valve is fixedly connected to the exhaust duct.

[0008] Preferably, a plurality of partition plates are fixedly connected to the inner side of the cooling chamber, and the plurality of partition plates are staggered and evenly distributed up and down along the length direction of the cooling chamber, and the plurality of partition plates form an S-shaped gas channel.

[0009] Preferably, a drain pipe is fixedly connected to the outside of the cooling chamber, and a control valve for controlling the pipeline switch of the drain pipe is fixedly connected to the drain pipe.

[0010] Preferably, the suction mechanism includes a box body, which is fixedly connected to the outside of the drying box, with an air inlet opened at one end of the box body and an air outlet opened at the other end of the box body, wherein the air outlet is connected to the inlet end of the heat exchange tube, and a suction impeller is rotatably connected to the inside of the box body, and a first transmission member is provided at the bottom end of the box body for driving the suction impeller to rotate by cooperating with the starting of the dual-axis motor.

[0011] Preferably, the first transmission member includes a first bevel gear coaxially fixedly connected to the suction impeller, an output shaft of the dual-shaft motor is fixedly connected to a second bevel gear, and the second bevel gear is meshed with the first bevel gear.

[0012] Preferably, the drying mechanism includes a central shaft, which is rotatably connected to the inner side of the drying chamber, and the central shaft is fixedly connected to drying net plates equidistantly distributed along the axial direction of the central shaft. The bottom end of the central shaft is provided with a second transmission member that drives the central shaft to rotate by cooperating with the start-up of a dual-axis motor.

[0013] Preferably, the second transmission member includes a third bevel gear fixedly connected to the bottom end of the central shaft, the inner side of the drying chamber is rotatably connected to a rotating shaft that passes through the side wall of the drying chamber, one end of the rotating shaft is fixedly connected to a fourth bevel gear that meshes with the third bevel gear, the other end of the rotating shaft is fixedly connected to a fifth bevel gear, and an output shaft of the dual-axis motor is fixedly connected to a sixth bevel gear that meshes with the fifth bevel gear.

[0014] Preferably, the number of teeth of the third bevel gear is greater than the number of teeth of the fourth bevel gear, and the number of teeth of the fifth bevel gear is the same as that of the sixth bevel gear.

[0015] The present invention also provides a method for using an energy-saving and stable hot air drying device, comprising the following steps: S1: Put the material to be dried into the drying chamber of the drying box, then start the fan and the double-axis motor, and energize the electric heating wire to increase the temperature inside the installation box; S2: After the fan is started, the air inside the drying box can be sucked in through the return air duct, and then the air is introduced into the installation box through the air supply duct for heating, and then the heated hot air is introduced into the drying room through the hot air guide duct to dry the material, and then the hot air with moisture is introduced into the cooling room through the air guide slot; S3: After the dual-axis motor is started, the air suction mechanism guides the external fresh air into the heat exchange tube, and then the external fresh air exchanges heat with the hot air in the cooling room through the heat exchange tube, so that the moisture in the hot air is cooled to form water droplets and remain in the cooling room. At the same time, the fresh air absorbs heat to achieve preheating; S4: The cooled hot air is re-introduced into the installation box through the return air duct for heating, and the pre-heated fresh air is introduced into the return air duct through the fresh air duct, and then further introduced into the installation box for secondary heating, and finally the heated hot air is introduced into the drying room through the hot air guide duct to dry the material, thus forming a cycle heating; S5: The air inlet volume of the fresh air duct and the air outlet volume of the exhaust duct are adjusted by controlling the opening and closing of the first air valve and the second air valve to maintain the hot air circulation in the drying chamber within a predetermined temperature and pressure range.

[0016] The working principle and beneficial effects of the present invention are: 1. Start the fan to make the return air duct suck out the air inside the drying box, and then introduce it into the installation box through the air supply duct. At the same time, energize the electric heating wire to make it heat up, so that the air temperature inside the installation box rises, and then introduce the hot air into the drying box through the hot air guide duct to dry the material. Then the return air duct re-introduces the hot air inside the drying box into the installation box for secondary heating. This cycle forms a hot air cycle. At the same time, fresh air can be introduced through the fresh air duct to maintain or reduce the humidity in the hot air cycle, thereby maintaining or increasing the drying effect; 2. The hot air can be introduced into the drying chamber through the hot air duct, and then introduced into the cooling chamber through the air guide groove. At the same time, the dual-axis motor is started to make the suction mechanism introduce the fresh air into the heat exchange tube, so that the external fresh air exchanges heat with the hot air in the cooling chamber through the heat exchange tube. Since the hot air needs to pass through the S-shaped gas channel formed by the partition plate, the flow path of the hot air will be extended, so that the contact time between the hot air and the heat exchange tube is longer, which greatly improves the heat exchange efficiency. The moisture in the hot air is cooled to form water droplets and remain in the cooling chamber. At the same time, the fresh air absorbs heat to achieve preheating. This not only reduces the humidity of the hot air, but also makes full use of the heat of the hot air to preheat the fresh air, greatly reducing the loss of electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 It is a structural schematic diagram of an energy-saving and stable hot air drying device of the present invention; Figure 2 It is a structural schematic diagram of the air supply mechanism of the present invention; Figure 3 It is a schematic diagram of the internal structure of the drying box of the present invention; Figure 4 It is a structural schematic diagram of the air suction mechanism of the present invention; Figure 5 It is a structural schematic diagram of the drying mechanism of the present invention; Figure 6 It is a schematic diagram of the external structure of the drying box of the present invention.

[0019] In the figure: 1, drying box; 11, drying chamber; 12, cooling chamber; 13, air guide slot; 14, partition plate; 15, heat exchange tube; 16, double-axis motor; 17, air suction mechanism; 171, box body; 172, air inlet; 173, air suction impeller; 174, first bevel gear; 175, second bevel gear; 176, air outlet; 18, drying mechanism; 181, central axis; 182, drying net plate; 183, third bevel gear Gear; 184, rotating shaft; 185, fourth bevel gear; 186, fifth bevel gear; 187, sixth bevel gear; 101, drain pipe; 102, control valve; 103, exhaust duct; 104, second air valve; 2, air supply mechanism; 21, shell; 22, fan; 23, return air duct; 24, air supply duct; 25, installation box; 26, electric heating wire; 27, hot air guide duct; 28, fresh air duct; 29, first air valve. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1 to Figure 6 As shown, the present embodiment proposes an energy-saving and stable hot air drying device, comprising a drying box 1, an air supply mechanism 2 is arranged on the outside of the drying box 1, the air supply mechanism 2 comprises a shell 21, a fan 22 is fixedly installed on the top of the inner side of the shell 21, the inlet end of the fan 22 is fixedly connected with a return air duct 23, the inlet end of the return air duct 23 is connected with the air outlet end of the drying box 1, the outlet end of the fan 22 is fixedly connected with an air supply duct 24, the outlet end of the air supply duct 24 is fixedly connected with an installation box 25, a plurality of electric heating wires 26 are fixedly connected to the inner side of the installation box 25, a hot air guide duct 27 is fixedly connected to the outlet end of the installation box 25, the outlet end of the hot air guide duct 27 is connected with the air inlet end of the drying box 1, a new air duct 28 is fixedly connected to the outer side of the return air duct 23, and a first air valve 29 for controlling the air volume of the new air duct 28 is fixedly connected to the new air duct 28.

[0022] By starting the fan 22, the return air duct 23 sucks out the air inside the drying box 1, and then introduces it into the installation box 25 through the air supply duct 24. At the same time, the electric heating wire 26 is energized to make it heat up, so that the air temperature inside the installation box 25 increases, and then the hot air is introduced into the drying box 1 through the hot air guide duct 27 to dry the material. Then the return air duct 23 re-introduces the hot air inside the drying box 1 into the installation box 25 for secondary heating. This cycle forms a hot air circulation. At the same time, fresh air can be introduced through the fresh air duct 28 to maintain or reduce the humidity in the hot air circulation, thereby maintaining or increasing the drying effect.

[0023] Furthermore, a drying chamber 11 is provided at the bottom of the inner side of the drying box 1, a cooling chamber 12 is provided at the top of the inner side of the drying box 1, a through air guide slot 13 is provided between the cooling chamber 12 and the drying chamber 11, a heat exchange pipe 15 is fixedly connected to the inner side of the cooling chamber 12, and the outlet end of the heat exchange pipe 15 is connected to the fresh air pipe 28, and a plurality of partition plates 14 are fixedly connected to the inner side of the cooling chamber 12, and the plurality of partition plates 14 are staggered and equidistantly distributed up and down along the length direction of the cooling chamber 12, and the plurality of partition plates 14 forms an S-shaped gas channel, a double-axis motor 16 is fixedly installed on the outer side of the drying box 1, and an air suction mechanism 17 is provided at the inlet end of the heat exchange tube 15 to introduce fresh air into the heat exchange tube 15 by cooperating with the start of the double-axis motor 16. A drying mechanism 18 is provided on the inner side of the drying chamber 11 to dry the material by cooperating with the start of the double-axis motor 16. An exhaust pipe 103 is fixedly connected to one end of the drying chamber 11, and a second air valve 104 is fixedly connected to the exhaust pipe 103.

[0024] The hot air can be introduced into the drying chamber 11 through the hot air duct 27, and then introduced into the cooling chamber 12 through the air guide groove 13. At the same time, the dual-axis motor 16 is started to make the suction mechanism 17 introduce fresh air into the heat exchange tube 15, so that the external fresh air exchanges heat with the hot air in the cooling chamber 12 through the heat exchange tube 15. Since the hot air needs to pass through the S-shaped gas channel formed by the partition plate 14, the flow path of the hot air will be extended, so that the contact time between the hot air and the heat exchange tube 15 is longer, which greatly improves the heat exchange efficiency. The moisture in the hot air is cooled to form water droplets and remain in the cooling chamber 12. At the same time, the fresh air absorbs heat to achieve preheating. This not only reduces the humidity of the hot air, but also makes full use of the heat of the hot air to preheat the fresh air, greatly reducing the loss of electric energy.

[0025] Furthermore, a drain pipe 101 is fixedly connected to the outside of the cooling chamber 12, and a control valve 102 for controlling the pipeline switch of the drain pipe 101 is fixedly connected to the drain pipe 101. By opening the control valve 102, the drain pipe 101 can discharge the water accumulated inside the cooling chamber 12.

[0026] Furthermore, the suction mechanism 17 includes a box body 171, which is fixedly connected to the outside of the drying box 1, an air inlet 172 is provided at one end of the box body 171, and an air outlet 176 is provided at the other end of the box body 171, and the air outlet 176 is connected to the inlet end of the heat exchange tube 15, and a suction impeller 173 is rotatably connected to the inside of the box body 171, and a first transmission member is provided at the bottom end of the box body 171 to drive the suction impeller 173 to rotate by cooperating with the start-up of the dual-axis motor 16, and the first transmission member includes a first bevel gear 174 coaxially fixedly connected to the suction impeller 173, and an output shaft of the dual-axis motor 16 is fixedly connected to a second bevel gear 175, and the second bevel gear 175 is meshed with the first bevel gear 174.

[0027] By starting the dual-axis motor 16, the second bevel gear 175 rotates, causing the first bevel gear 174 to rotate, which causes the suction impeller 173 to rotate synchronously, thereby reducing the pressure at the air inlet 172 and sucking in fresh air, which is then introduced into the heat exchange tube 15 through the air outlet 176, and then introduced into the fresh air tube 28 through the heat exchange tube 15, so that fresh air is introduced into the air supply mechanism 2 to maintain or reduce the humidity in the hot air circulation.

[0028] Furthermore, the drying mechanism 18 includes a central shaft 181, which is rotatably connected to the inner side of the drying chamber 11. The central shaft 181 is fixedly connected to a drying net plate 182 that is equidistantly distributed along the axial direction of the central shaft 181. The bottom end of the central shaft 181 is provided with a second transmission member that drives the central shaft 181 to rotate by cooperating with the start of the dual-axis motor 16. The second transmission member includes a third bevel gear 183 fixedly connected to the bottom end of the central shaft 181. The inner side of the drying chamber 11 is rotatably connected to a rotating shaft 184 that passes through the side wall of the drying chamber 11. One end of the rotating shaft 184 is fixedly connected to a fourth bevel gear 185 that meshes with the third bevel gear 183. The other end of the rotating shaft 184 is fixedly connected to a fifth bevel gear 186. An output shaft of the dual-axis motor 16 is fixedly connected to a sixth bevel gear 187 that meshes with the fifth bevel gear 186. The number of teeth of the third bevel gear 183 is greater than that of the fourth bevel gear 185, and the number of teeth of the fifth bevel gear 186 is the same as that of the sixth bevel gear 187.

[0029] Working principle: First, open the door of the drying box 1 (not marked in the figure) and place the material on the drying net plate 182, then close the door and start the fan 22 and the dual-axis motor 16, and at the same time energize the electric heating wire 26 to increase the temperature inside the installation box 25. After the fan 22 is started, the air inside the drying box 1 can be sucked in through the return air duct 23, and then the air is introduced into the installation box 25 through the air supply duct 24 for heating, and then the heated hot air is introduced into the drying chamber 11 through the hot air guide duct 27 to dry the material, and then the hot air is introduced into the cooling chamber 12 through the air guide slot 13. , and at the same time, the dual-axis motor 16 is started to make the air suction mechanism 17 introduce the fresh air into the heat exchange tube 15, so that the external fresh air exchanges heat with the hot air in the cooling chamber 12 through the heat exchange tube 15. Since the hot air needs to pass through the S-shaped gas channel formed by the partition plate 14, the flow path of the hot air will be extended, so that the contact time between the hot air and the heat exchange tube 15 is longer, which greatly improves the heat exchange efficiency. After the moisture in the hot air is cooled, it forms water droplets and remains in the cooling chamber 12. At the same time, the fresh air absorbs heat to achieve preheating, which can not only reduce the humidity of the hot air, but also make full use of the heat of the hot air to preheat the fresh air; After the dual-axis motor 16 is started, it will drive the sixth bevel gear 187 to rotate, so that the fifth bevel gear 186 drives the rotating shaft 184 to rotate, and the fourth bevel gear 185 drives the third bevel gear 183 to rotate synchronously, which makes the central shaft 181 drive all the drying net plates 182 to rotate, so that the materials are evenly heated to improve the drying effect; the dual-axis motor 16 simultaneously drives the second bevel gear 175 to rotate, so that the first bevel gear 174 rotates, which makes the suction impeller 173 rotate synchronously, so that the pressure of the air inlet 172 is reduced and the Fresh air is sucked in, then introduced into the heat exchange tube 15 through the air outlet 176, and then introduced into the fresh air duct 28 through the heat exchange tube 15, so that fresh air is introduced into the air supply mechanism 2 to maintain or reduce the humidity in the hot air circulation, and the air intake volume of the fresh air duct 28 and the air outlet volume of the exhaust duct 103 are adjusted by controlling the opening and closing of the first air valve 29 and the second air valve 104 to maintain the hot air circulation in the drying chamber 11 within a predetermined temperature and pressure range, thereby reducing the energy loss after the hot air is transported, thereby reducing the power consumption of the electric heating and the fan 22.

[0030] The present invention also provides a method for using an energy-saving and stable hot air drying device, comprising the following steps: S1: Put the material to be dried into the drying chamber 11 of the drying box 1, then start the fan 22 and the double-axis motor 16, and at the same time energize the electric heating wire 26 to increase the temperature inside the installation box 25; S2: After the fan 22 is started, the air inside the drying box 1 can be sucked in through the return air duct 23, and then the air is introduced into the installation box 25 through the air supply duct 24 for heating, and then the heated hot air is introduced into the drying chamber 11 through the hot air guide duct 27 to dry the material, and then the hot air with moisture is introduced into the cooling chamber 12 through the air guide slot 13; S3: After the dual-axis motor 16 is started, the air suction mechanism 17 guides the external fresh air into the heat exchange tube 15, and then the external fresh air exchanges heat with the hot air in the cooling chamber 12 through the heat exchange tube 15, so that the moisture in the hot air is cooled to form water droplets and remain in the cooling chamber 12, and at the same time, the fresh air absorbs heat to achieve preheating; S4: The cooled hot air is re-introduced into the installation box 25 through the return air duct 23 for heating, and the pre-heated fresh air is introduced into the return air duct 23 through the fresh air duct 28, and then continues to be introduced into the installation box 25 for secondary heating, and finally the heated hot air is introduced into the drying chamber 11 through the hot air guide duct 27 to dry the material, thus forming a cycle heating; S5: The air intake of the fresh air duct 28 and the air outlet of the exhaust duct 103 are adjusted by controlling the opening and closing of the first air valve 29 and the second air valve 104 to maintain the hot air circulation inside the drying chamber 11 within a predetermined temperature and pressure range.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving and stable hot air drying device, comprising a drying box (1), characterized in that: An air supply mechanism (2) is arranged outside the drying box (1), and the air supply mechanism (2) comprises a shell (21), a fan (22) is fixedly mounted on the top of the inner side of the shell (21), an inlet end of the fan (22) is fixedly connected to a return air duct (23), the inlet end of the return air duct (23) is connected to the air outlet end of the drying box (1), an outlet end of the fan (22) is fixedly connected to an air supply duct (24), and the outlet end of the air supply duct (24) is fixedly connected to the return air duct (23). An installation box (25) is connected, a plurality of electric heating wires (26) are fixedly connected to the inner side of the installation box (25), a hot air guide duct (27) is fixedly connected to the outlet end of the installation box (25), the outlet end of the hot air guide duct (27) is connected to the air inlet end of the drying box (1), a fresh air duct (28) is fixedly connected to the outer side of the return air duct (23), and a first air valve (29) for controlling the air volume of the fresh air duct (28) is fixedly connected to the fresh air duct (28).

2. The energy-saving and stable hot air drying equipment according to claim 1 is characterized in that: A drying chamber (11) is provided at the bottom end of the inner side of the drying box (1), a cooling chamber (12) is provided at the top end of the inner side of the drying box (1), an air guide groove (13) is provided between the cooling chamber (12) and the drying chamber (11), a heat exchange tube (15) is fixedly connected to the inner side of the cooling chamber (12), the outlet end of the heat exchange tube (15) is connected to the fresh air tube (28), a double-shaft motor (16) is fixedly installed on the outer side of the drying box (1), an air suction mechanism (17) is provided at the inlet end of the heat exchange tube (15) for introducing fresh air into the heat exchange tube (15) by cooperating with the start of the double-shaft motor (16), a drying mechanism (18) is provided on the inner side of the drying chamber (11) for drying materials by cooperating with the start of the double-shaft motor (16), an exhaust tube (103) is fixedly connected to one end of the drying chamber (11), and a second air valve (104) is fixedly connected to the exhaust tube (103).

3. The energy-saving and stable hot air drying equipment according to claim 2 is characterized in that: A plurality of partition plates (14) are fixedly connected to the inner side of the cooling chamber (12); the plurality of partition plates (14) are staggered and evenly distributed up and down along the length direction of the cooling chamber (12); the plurality of partition plates (14) form an S-shaped gas channel.

4. The energy-saving and stable hot air drying equipment according to claim 2 is characterized in that: A drainage pipe (101) is fixedly connected to the outside of the cooling chamber (12), and a control valve (102) for controlling the pipeline switch of the drainage pipe (101) is fixedly connected to the drainage pipe (101).

5. The energy-saving and stable hot air drying equipment according to claim 2 is characterized in that: The air suction mechanism (17) comprises a box body (171), the box body (171) being fixedly connected to the outside of the drying box (1), an air inlet (172) being provided at one end of the box body (171), an air outlet (176) being provided at the other end of the box body (171), the air outlet (176) being connected to the inlet end of the heat exchange tube (15), an air suction impeller (173) being rotatably connected to the inside of the box body (171), and a first transmission member being provided at the bottom end of the box body (171) for driving the air suction impeller (173) to rotate by cooperating with the start-up of the dual-axis motor (16).

6. The energy-saving and stable hot air drying equipment according to claim 5 is characterized in that: The first transmission member comprises a first bevel gear (174) coaxially fixedly connected to the suction impeller (173); an output shaft of the dual-shaft motor (16) is fixedly connected to a second bevel gear (175); the second bevel gear (175) is meshed with the first bevel gear (174).

7. The energy-saving and stable hot air drying equipment according to claim 2 is characterized in that: The drying mechanism (18) comprises a central shaft (181), the central shaft (181) being rotatably connected to the inner side of the drying chamber (11), the central shaft (181) being fixedly connected to drying net plates (182) which are equidistantly distributed along the axis direction of the central shaft (181), and the bottom end of the central shaft (181) is provided with a second transmission member which drives the central shaft (181) to rotate by cooperating with the start-up of the dual-axis motor (16).

8. The energy-saving and stable hot air drying equipment according to claim 7 is characterized in that: The second transmission member comprises a third bevel gear (183) fixedly connected to the bottom end of the central shaft (181); a rotating shaft (184) penetrating the side wall of the drying chamber (11) is rotatably connected to the inner side of the drying chamber (11); one end of the rotating shaft (184) is fixedly connected to a fourth bevel gear (185) meshing with the third bevel gear (183); the other end of the rotating shaft (184) is fixedly connected to a fifth bevel gear (186); and an output shaft of the dual-shaft motor (16) is fixedly connected to a sixth bevel gear (187) meshing with the fifth bevel gear (186).

9. The energy-saving and stable hot air drying equipment according to claim 8, characterized in that: The number of teeth of the third bevel gear (183) is greater than the number of teeth of the fourth bevel gear (185), and the number of teeth of the fifth bevel gear (186) is the same as that of the sixth bevel gear (187).

10. A method for using the energy-saving and stable hot air drying equipment according to claim 2, characterized in that: The steps include: S1: placing the material to be dried into the drying chamber (11) of the drying box (1), then starting the fan (22) and the dual-axis motor (16), and at the same time energizing the electric heating wire (26) to increase the temperature inside the installation box (25); S2: After the fan (22) is started, the air inside the drying box (1) can be sucked in through the return air duct (23), and then the air is introduced into the installation box (25) through the air supply duct (24) for heating, and then the heated hot air is introduced into the drying chamber (11) through the hot air guide duct (27) to dry the material, and then the hot air with moisture is introduced into the cooling chamber (12) through the air guide groove (13); S3: After the dual-axis motor (16) is started, the air suction mechanism (17) guides the external fresh air into the heat exchange tube (15), and then the external fresh air exchanges heat with the hot air in the cooling chamber (12) through the heat exchange tube (15), so that the moisture in the hot air is cooled to form water droplets and remain in the cooling chamber (12), and at the same time, the fresh air absorbs heat to achieve preheating; S4: The cooled hot air is re-introduced into the installation box (25) through the return air duct (23) for heating, while the pre-heated fresh air is introduced into the return air duct (23) through the fresh air duct (28), and then further introduced into the installation box (25) for secondary heating. Finally, the heated hot air is introduced into the drying chamber (11) through the hot air guide duct (27) to dry the material, thus forming a cyclic heating. S5: By controlling the opening and closing of the first air valve (29) and the second air valve (104), the air intake volume of the fresh air duct (28) and the air outlet volume of the exhaust duct (103) are adjusted to maintain the hot air circulation inside the drying chamber (11) within a predetermined temperature and pressure range.

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