Double-tower commutation type air drying device

Abstract

The invention relates to a double-tower commutation type air drying device, and relates to the technical field of air dryers. The device comprises a first drying tower and a second drying tower, an air inlet reversing valve is arranged between the first drying tower and the second drying tower, an air outlet check valve is arranged between the first drying tower and the second drying tower, and the air outlet check valve is communicated with the first drying tower and the second drying tower; drying cavities are formed in the first drying tower and the second drying tower, partition plates are arranged in the drying cavities, a functional bag is arranged on each partition plate, a plurality of partition plates are arranged, the functional bags are molecular sieve bags, and the functional bags are used for containing drying adsorbents. A blow-down valve is arranged between the first drying tower and the second drying tower, and the blow-down valve is communicated with the first drying tower and the second drying tower through a valve. The dryer has the effect of reducing dust accumulation in the dryer.

Description

Technical Field

[0001] The present invention relates to the field of air drying, and more particularly to a double-tower flow-switching air drying device. Background Art

[0002] With the development of vehicle braking technology, the pneumatic braking chassis system is an important braking method for domestic automobiles at present. After the air compressor compresses the air, the compressed air containing a large amount of moisture and also carrying oil, coke, dust, etc. flows into the braking pipeline system, thus causing great harm to the vehicle braking system. For example, components such as electronic devices and rubber seals in the braking system will be severely damaged, thereby reducing the safety performance and reliability of use of the vehicle. Therefore, air dryers are commonly used in vehicles to remove substances such as moisture, oil, coke, and dust in the compressed air, and at the same time adjust the pressure of the compressed air supplied to the braking pipeline system.

[0003] However, in the traditional air drying device, during the working process, since it is often necessary to compress water, dust, etc. in the air, dust often accumulates in the drying device, which is likely to cause wear to the starting equipment, and further affect the drying efficiency of the drying device, so it needs to be improved. Summary of the Invention

[0004] In order to improve the problem that dust is likely to accumulate in the air drying device in the related art, the present invention provides a double-tower flow-switching air drying device.

[0005] The double-tower flow-switching air drying device provided by the present invention adopts the following technical solutions: A double-tower flow-switching air drying device includes a first drying tower and a second drying tower. An intake air reversing valve is arranged between the first drying tower and the second drying tower. An outlet check valve is arranged between the first drying tower and the second drying tower, and the outlet check valve is communicated with both the first drying tower and the second drying tower; drying chambers are provided in the first drying tower and the second drying tower, a partition plate is arranged in the drying chamber, a functional bag is arranged on the partition plate, there are several partition plates, the functional bag is a molecular sieve bag, and the functional bag is used for placing adsorbents for drying. A sewage discharge valve is arranged between the first drying tower and the second drying tower, and the sewage discharge valve is communicated with both the first drying tower and the second drying tower through a valve.

[0006] By adopting the above technical solution, when saturated humid air enters the drying device, it enters a drying tower through an open valve. When passing through the high-efficiency centrifugal oil-water separator in a drying tower, larger water droplets, oil droplets and dust are removed. Then, the moisture is absorbed by the adsorbent, and the dried air after passing through the drying tower opens the outlet check valve by means of pressure. When the regeneration state of a drying tower reaches the set time, the electronic controller stops supplying power to the valve. At this time, both solenoid valves are in a power-off state, and the two sewage outlets of the sewage valve are also in a closed state. Therefore, one drying tower continues to dry while the other drying tower stops regenerating. A part of the dried air still continuously fills the drying tower, and the drying tower into which the air is filled has no discharge, so the pressure gradually rises. The drying tower is in an "air-filling state" (pressure boosting) during this period, that is, flexible conversion can be achieved. Then, the electronic controller starts to supply power to the valve. At this time, the drying and regeneration of the two drying towers are mutually converted. Thus, the problem that dust is easily accumulated when a single drying tower dries air is improved.

[0007] Optionally, a flow conversion hole is provided in the outlet check valve, and the flow conversion hole is respectively communicated with the first drying tower and the second drying tower.

[0008] By adopting the above technical solution, the dried air is sent to the main air reservoir. The left and right air inlet chambers of the outlet check valve are connected through the flow conversion hole. A part of the dried air treated by a drying tower flows through a small hole to the other drying tower, blows to the adsorbent from the upper part of the other drying tower, absorbs the moisture in the adsorbent (regeneration), and discharges the water droplets, oil droplets and dust at the lower part of the centrifugal oil-water separator through the sewage valve port, thereby improving the energy utilization rate in the drying tower.

[0009] Optionally, a material-changing support is arranged on the outer sides of the first drying tower and the second drying tower. A material-changing connecting rod is rotatably connected to the side wall of the material-changing support. A material-changing plate is detachably connected to the side wall of the material-changing connecting rod. Material-changing grooves are provided on the side walls of the first drying tower and the second drying tower close to the material-changing plate. The material-changing grooves are communicated with the drying cavity. The material-changing plate is inserted into the material-changing groove as the material-changing connecting rod rotates.

[0010] By adopting the above technical solution, in the way of the material-changing support, when the bagged adsorbent in the drying cavity has been used for a long time, the material-changing connecting rod can be rotated to make the material-changing connecting rod rotate near a drying tower, and the adsorbent on the partition plate in the original drying cavity can be replaced through the material-changing groove, improving the convenience of drying the adsorbent in the drying tower.

[0011] Optionally, the charging link rod includes a connecting rod and a positioning rod. The connecting rod is rotatably connected to the charging bracket. The positioning rod is arranged at one end of the connecting rod away from the charging bracket. The positioning rod is rotatably connected to the connecting rod. A material taking mechanism is arranged at one end of the positioning rod away from the connecting rod. A charging box is arranged on the side wall of the positioning rod. The charging plate is located inside the charging box. The charging box is located below the material taking mechanism.

[0012] By adopting the above technical solution, the positioning rod rotates with the connecting rod, so that when the positioning rod drives the charging box to rotate towards the drying tower, the charging box is always parallel to the charging slot on the drying tower, which is convenient for replacing the new adsorbent in the charging box.

[0013] Optionally, a lifting mechanism is arranged on the side wall of the positioning rod. The lifting mechanism includes a lifting plate, a lifting gear, an engaging strip and a lifting motor. An engaging tooth is arranged on the side wall of the positioning rod. The inside of the lifting plate is hollow. The engaging tooth is inserted into the lifting plate. The lifting gear is located on one side of the engaging tooth. The lifting gear is located inside the lifting plate. The positioning rod abuts against the inner side wall of the lifting plate. The engaging strip is located inside the lifting plate. The engaging strip meshes with the lifting gear. The engaging strip abuts against the inner side wall of the lifting plate. The lifting motor is arranged on the lifting plate. The lifting motor is used to drive the lifting gear to rotate. The material taking mechanism and the charging box are both located on the engaging strip.

[0014] By adopting the above technical solution, since the charging box and the material taking mechanism are at different heights, the structure of the lifting plate, the lifting gear, the engaging strip and the lifting motor can be used to select the material taking mechanism or the charging box at the parallel height of the positioning rod and the charging slot. When it is necessary to take out the drying part in the drying tower, the material taking mechanism is arranged parallel to the charging slot. When it is necessary to replace the new adsorbent into the drying tower, the charging box and the charging slot are at the same height.

[0015] Optionally, a drying part is arranged in the drying cavity. The partition plate is connected to the inner side wall of the drying part. A sliding mechanism is arranged in the first drying tower and the second drying tower. The sliding mechanism includes a driving motor and a driving gear. The driving motor is arranged on the side wall of the first drying tower. The driving gear is arranged at the output end of the driving motor. A driving slot is opened on the bottom wall of the drying cavity. The driving gear is located in the driving slot. An engaging rack is arranged on the bottom wall of the drying part. The driving gear meshes with the engaging rack.

[0016] By adopting the above technical solution, the sliding mechanism can abut against the bottom wall of the drying part during the charging process, and drive the driving gear to rotate through the driving motor, so as to move the drying part out of the drying cavity onto the material taking mechanism, thus completing the material taking.

[0017] Optionally, a sealing plate is provided on the bottom wall of the drying section. The sealing plate is connected to the bottom wall of the drying section, and both the driving gear and the driving motor are provided on the side of the sealing plate close to the drying section.

[0018] By adopting the above technical solution, the structure of the sealing plate increases the airtightness of the drying tower during the refueling process, and further improves the efficiency of air drying.

[0019] Optionally, a plurality of refueling plates are provided in the refueling box. The number of the plurality of refueling plates is the same as the number of partition plates in the first drying tower or the second drying tower. A pushing block is provided on the side wall of the refueling box, and a pushing cylinder is provided on the top wall of the pushing block. The pushing cylinder is arranged in the direction towards the refueling plate, and the pushing cylinder is used to push the refueling plate into the drying cavity.

[0020] By adopting the above technical solution, the number of refueling plates is the same as the number of partition plates, so that all the adsorbents in the drying tower can be replaced simultaneously, improving the replacement efficiency when replacing the adsorbents. The structure of the pushing cylinder can push a plurality of refueling plates into the drying cavity as a whole, further improving the convenience when replacing the adsorbents.

[0021] Optionally, positioning magnets are provided on the side wall of the refueling box, and connecting magnets are provided on the side wall of the first drying tower or the second drying tower close to the refueling box. The positioning magnets and the connecting magnets are magnetically attracted to each other.

[0022] By adopting the above technical solution, the structure of the positioning magnets makes the refueling box more stable when communicating with the refueling tank during the replacement of the adsorbent.

[0023] Optionally, there are four positioning magnets, and the four positioning magnets are arranged at the corners of the side wall of the refueling box. The connecting magnets are correspondingly arranged on the side wall of the first drying tower or the second drying tower close to the positioning magnets.

[0024] By adopting the above technical solution, the positioning magnets and the adsorption magnets are located at the corners. When the four positioning magnets and the adsorption magnets are attracted to each other, the refueling box and the refueling tank are completely corresponding, further increasing the stability when replacing the adsorbent.

[0025] In summary, the present invention has at least the following beneficial effects: 1. When saturated moist air enters the drying device and passes through an open valve into a drying tower, when it passes through a high-efficiency centrifugal oil-water separator in the drying tower, larger water droplets, oil droplets, and dust are removed. Then, the moisture is absorbed by the adsorbent, and the dried air after passing through the drying tower opens the outlet check valve by means of pressure. When the regeneration state of a drying tower reaches the set time, the electric controller stops supplying power to the valve. At this time, both solenoid valves are in a power-off state, and the two sewage discharge ports of the sewage discharge valve are also in a closed state. Therefore, one drying tower continues to dry while the other drying tower stops regenerating. A part of the dried air still continuously fills the drying tower, and the drying tower without air discharge has its pressure gradually rising. The drying tower is in an "air-filling state" (pressure increasing) during this period, that is, flexible conversion can be achieved. Then, the electric controller starts to supply power to the valve. At this time, the drying and regeneration of the two drying towers are mutually converted. Thus, the problem that dust is easily accumulated when a single drying tower dries air is improved.

[0026] 2. The dried air is sent to the main air reservoir. The left and right intake chambers of the outlet check valve are connected through a flow conversion hole. A part of the dried air processed by one drying tower flows through a small hole to the other drying tower, blows to the adsorbent from the upper part of the other drying tower, absorbs the moisture in the adsorbent (regeneration), and discharges the water droplets, oil droplets, and dust at the lower part of the centrifugal oil-water separator through the sewage discharge valve port, thereby improving the energy utilization rate in the drying tower. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of an embodiment of the present invention; Figure 2 It is a schematic structural diagram of an embodiment of the present invention for showing the connection relationship between the lifting motor and the lifting plate; Figure 3 It is a schematic structural diagram of an embodiment of the present invention for showing the connection relationship between the charging box and the lifting mechanism; Figure 4 For the present invention Figure 3 An enlarged schematic diagram of part A; In the figure: 11. The first drying tower; 12. The second drying tower; 13. The intake air changeover valve; 14. The outlet check valve; 15. The drying cavity; 16. The partition plate; 17. The sewage discharge valve; 18. The flow conversion hole; 2. The charging support; 21. The charging connecting rod; 22. The charging plate; 23. The charging groove; 24. The connecting rod; 25. The positioning rod; 26. The material taking mechanism; 27. The charging box; 28. The lifting mechanism; 281. The lifting plate; 282. The lifting gear; 283. The meshing strip; 284. The lifting motor; 285. The connecting tooth; 3. The drying part; 35. The sealing plate; 37. The pushing block; 38. The pushing cylinder; 39. The positioning magnet; 391. The connecting magnet. Detailed Embodiment

[0028] The following is combined with the attachedFigures 1-4 Further detailed description of the present invention is provided as follows.

[0029] Embodiment 1: The embodiment of the present invention discloses a double-tower flow-switching air drying device. Referring to Figure 1 , a double-tower flow-switching air drying device includes a material-changing support 2. On one side of the material-changing support 2, a first drying tower 11 and a second drying tower 12 are provided, and both the first drying tower 11 and the second drying tower 12 are vertically arranged. An intake air reversing valve 13 is arranged between the first drying tower 11 and the second drying tower 12. The intake air reversing valve 13 is a solenoid valve. By opening or closing the intake air reversing valve, the intake air into the first drying tower 11 and the second drying tower 12 can be controlled. A sewage discharge valve 17 is arranged between the first drying tower 11 and the second drying tower 12, and the sewage discharge valve 17 is communicated with both the first drying tower 11 and the second drying tower 12. The sewage in the first drying tower 11 and the second drying tower 12 is discharged through the sewage discharge valve 17. An outlet check valve 14 is also arranged between the first drying tower 11 and the second drying tower 12. The outlet check valve 14 is arranged at the upper part of the first drying tower 11 and the second drying tower 12. A flow-switching hole 18 is opened in the outlet check valve 14, and both ends of the flow-switching hole 18 are communicated with the first drying tower 11 and the second drying tower 12 respectively.

[0030] Drying cavities 15 are formed inside the first drying tower 11 and the second drying tower 12. A partition plate 16 is fixedly welded on the inner side wall of the drying cavity 15, and the partition plate 16 is used for carrying molecular sieve bags filled with adsorbents.

[0031] The implementation principle of Embodiment 1 of a two-tower flow-converting air drying device according to an embodiment of the present invention is as follows: When saturated wet air enters the drying device, it passes through an open valve and enters a drying tower. When passing through the high-efficiency centrifugal oil-water separator in a drying tower, larger water droplets, oil droplets and dust are removed. Then, the moisture is absorbed by the adsorbent. The dried air after passing through the drying tower opens the air outlet check valve 14 by means of pressure. When the regeneration state of a drying tower reaches the set time, the electronic controller stops supplying power to the valve. At this time, both solenoid valves are in a power-off state, and the two sewage discharge ports of the sewage discharge valve 17 are also in a closed state. Therefore, one drying tower continues to dry while the other drying tower stops regenerating. A part of the dried air continuously fills the drying tower, and the drying tower without air discharge has its pressure gradually rising. The drying tower is in an "air filling state" (pressure increasing) during this period, that is, flexible conversion can be achieved. Then, the electronic controller starts to supply power to the valve. At this time, the drying and regeneration of the two drying towers are mutually converted. The dried air is sent to the main air reservoir. The left and right air inlet chambers of the air outlet check valve 14 are connected through the flow conversion hole 18. A part of the dried air processed by one drying tower flows through small holes to the other drying tower, blows to the adsorbent from the upper part of the other drying tower, absorbs the moisture in the adsorbent (regeneration), and discharges the water droplets, oil droplets and dust at the lower part of the centrifugal oil-water separator through the sewage discharge valve 17 port.

[0032] Embodiment 2: Referring to Figure 1 and Figure 2 and, at the middle position of the material changing support 2, a material changing connecting rod 21 is rotatably connected through a rotating shaft. And a pair of material changing connecting rods 21 are provided. The material changing connecting rod 21 includes a connecting rod 24 and a positioning rod 25. The connecting rod 24 is rotatably connected to the material changing support 2. The positioning rod 25 is rotatably connected to one end of the connecting rod 24 close to the drying tower through a rotating shaft, and the positioning rod 25 is an L-shaped rod. A material taking mechanism 26 and a material changing box 27 are provided on the positioning rod 25. Among them, the material taking mechanism 26 and the material changing box 27 are arranged vertically, and the material taking mechanism 26 is located above the material changing box 27. A lifting mechanism 28 is provided on the side wall of the positioning rod 25. The lifting mechanism 28 is located on the side of the material taking mechanism 26 close to the positioning rod 25. The lifting mechanism 28 is used to control the rising or falling of the material taking mechanism 26 and the material changing box 27, so as to facilitate the material taking mechanism 26 to take out or replace the drying part 3 from the drying tower.

[0033] Referring to Figure 2 、 Figure 3 and Figure 4, the lifting mechanism 28 includes a lifting plate 281, a lifting gear 282, an engaging rack, and a lifting motor 284. An engaging tooth 285 is provided on the side wall of the positioning rod 25 close to the material taking mechanism 26. The lifting plate 281 is a square plate and is hollow inside. One end of the positioning rod 25 close to the engaging tooth 285 is inserted into the lifting plate 281. And the side wall of the positioning rod 25 far from the engaging tooth 285 is attached to the inner side wall of the lifting plate 281. The lifting gear 282 is located inside the lifting plate 281, and the lifting gear 282 is engaged with the engaging tooth 285; the engaging rack is located on the side of the lifting gear 282 far from the engaging tooth 285, and the engaging rack is engaged with the lifting gear 282. The engaging rack is inserted into the lifting plate 281, and the side wall of the engaging rack far from the lifting gear 282 is attached to the inner side wall of the lifting plate 281. The lifting motor 284 is fixedly installed on the side wall of the lifting plate 281 through a flange, and the output end of the lifting motor 284 extends into the lifting plate 281. The material changing box 27 and the material taking mechanism 26 are both located at the end of the engaging rack. When the lifting motor 284 drives the lifting gear 282 to rotate, the engaging rack drives the material changing box 27 and the material taking mechanism 26 to move up and down.

[0034] Referring to Figure 3 , a material changing groove 23 is provided on the side wall of the first drying tower 11 and the second drying tower 12 close to the positioning rod 25, and the drying part 3 is replaced through the material changing groove 23. The material taking mechanism 26 is selected as a material taking plate, and the material taking mechanism 26 is fixedly welded to the side wall of the engaging rack. When the positioning rod 25 rotates to be flush with the first drying tower 11 or the second drying tower 12, the material taking plate is vertically arranged with the side wall of the first drying tower 11. A sealing plate 35 is provided on the bottom wall of the first drying tower 11 and the second drying tower 12, and a sliding mechanism is provided above the sealing plate 35. The sliding mechanism is used to move the drying part 3 out of the drying cavity 15. The sliding mechanism includes a driving motor and a driving gear. A driving groove is provided on the bottom wall of the drying cavity 15, the driving gear is inserted into the driving groove, the driving motor is fixedly installed on one side of the driving gear, and the driving motor is used to control the driving gear to rotate. Friction lines are provided on the side wall of the driving gear, and an engaging rack is provided on the bottom wall of the drying part. The side wall of the driving gear is engaged with the side wall of the engaging rack. Thus, when the driving gear rotates, under the action of friction, the drying part 3 starts to move and is pushed onto the material taking mechanism 26.

[0035] Referring to Figure 3, the inside of the material replacement box 27 is hollow, and both sides of the material replacement box 27 are slotted. A material replacement plate 22 is inserted into the material replacement box 27. The number of material replacement plates 22 is the same as that of the partition plates 16, and each pair of material replacement plates 22 is fixedly connected. A corresponding adsorbent is placed on each material replacement plate 22, and the adsorbent placed on the material replacement plate 22 is the same as the reagent placed on the partition plate 16. Therefore, only by putting the fixedly connected material replacement plates 22 as a whole into the drying part 3 in the first drying tower 11 and the second drying tower 12 can the replacement of the partition plates 16 and the corresponding adsorbents in the drying part 3 be completed. A pushing block 37 is welded and fixed on the bottom wall and side wall of the material replacement box 27. A pushing cylinder 38 is fixedly connected to the top wall of the pushing block 37 through bolts. The output end of the pushing cylinder 38 abuts against the side wall of the material replacement plate 22 at the inner bottom of the material replacement box 27. Thus, the pushing cylinder 38 can push the material replacement plate 22 into the first drying tower 11 and the second drying tower 12, and further realize the replacement of the adsorbent.

[0036] Refer to Figure 2 , a positioning magnet 39 is embedded on the side wall of the material replacement box 27 close to the first drying tower 11. There are four positioning magnets 39, and the four positioning magnets 39 are respectively located at the corners of the material replacement box 27. Connecting magnets 391 are arranged on the side walls of the first drying tower 11 and the second drying tower 12 close to the material replacement box 27, and the connecting magnets 391 are arranged at the corresponding positions of the first drying tower 11 and the second drying tower 12 and the material replacement box 27. Thus, when replacing the adsorbent, the positioning magnet 39 adsorbs with the connecting magnet 391, and further improves the overall stability when replacing the adsorbent.

[0037] The implementation principle of Embodiment 2 of the dual-tower counter-flow air drying device according to the embodiment of the present invention is as follows: When the air drying device in the present invention is in use and the adsorbent needs to be replaced after being used for a long time, the operator first opens the material replacement slot 23. Then, rotate the material replacement connecting rod 21 so that the positioning rod 25 rotates to the first drying tower 11 and the second drying tower 12. Start the lifting motor 284, so that the lifting motor 284 drives the lifting gear 282 to rotate, so that the lifting gear 282 drives the meshing plate strip 283 to rotate, and further drives the material replacement box 27 and the material taking mechanism 26 to move up and down. When the material taking mechanism 26 moves to be parallel to the bottom wall of the material replacement slot 23, the driving motor controls the driving gear to rotate, so as to drive the drying part 3 to slide out of the drying cavity 15 and slide onto the material taking mechanism 26. Then, the lifting gear 282 rotates again until the material replacement box 27 is flush with the bottom wall of the material replacement slot 23. At this time, the positioning magnet 39 adsorbs with the connecting magnet 391. At the same time, the pushing cylinder 38 pushes the material replacement plate 22 into the drying cavity 15, thus completing the replacement of the adsorbent.

[0038] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A double-tower counter-flow air drying device, characterized in that: It includes a first drying tower (11) and a second drying tower (12). An intake air reversing valve (13) is arranged between the first drying tower (11) and the second drying tower (12). An outlet check valve (14) is arranged between the first drying tower (11) and the second drying tower (12). The outlet check valve (14) is connected to both the first drying tower (11) and the second drying tower (12); a drying chamber (15) is provided in the first drying tower (11) and the second drying tower (12). A partition plate (16) is arranged in the drying chamber (15). A functional bag is arranged on the partition plate (16). A number of partition plates (16) are provided. The functional bag is a molecular sieve bag and is used for placing adsorbents for drying. A drain valve (17) is arranged between the first drying tower (11) and the second drying tower (12). The drain valve (17) is connected to both the first drying tower (11) and the second drying tower (12) through a valve.

2. The dual-tower flow-through air drying device according to claim 1, characterized in that: A flow conversion hole (18) is provided in the outlet check valve (14). The flow conversion hole (18) is respectively connected to the first drying tower (11) and the second drying tower (12).

3. The dual-tower flow-through air drying device according to claim 1, wherein: A material changing support (2) is arranged on the outer sides of the first drying tower (11) and the second drying tower (12). A material changing connecting rod (21) is rotatably connected to the side wall of the material changing support (2). A material changing plate (22) is detachably connected to the side wall of the material changing connecting rod (21). A material changing groove (23) is provided on the side walls of the first drying tower (11) and the second drying tower (12) close to the material changing plate (22). The material changing groove (23) is connected to the drying chamber (15). The material changing plate (22) is inserted into the material changing groove (23) as the material changing connecting rod (21) rotates.

4. The dual-tower flow-through air drying device according to claim 3, wherein: The material changing connecting rod (21) includes a connecting rod (24) and a positioning rod (25). The connecting rod (24) is rotatably connected to the material changing support (2). The positioning rod (25) is arranged at one end of the connecting rod (24) away from the material changing support (2). The positioning rod (25) is rotatably connected to the connecting rod (24). A material taking mechanism (26) is arranged at one end of the positioning rod (25) away from the connecting rod (24). A material changing box (27) is arranged on the side wall of the positioning rod (25). The material changing plate (22) is located in the material changing box (27). The material changing box (27) is located below the material taking mechanism (26).

5. The air drying device with double towers and flow conversion according to claim 4, characterized in that: A lifting mechanism (28) is provided on the side wall of the positioning rod (25). The lifting mechanism (28) includes a lifting plate (281), a lifting gear (282), an engaging strip (283) and a lifting motor (284). An engaging tooth (285) is provided on the side wall of the positioning rod (25). The lifting plate (281) is hollow inside. The engaging tooth (285) is inserted into the lifting plate (281). The lifting gear (282) is located on one side of the engaging tooth (285). The lifting gear (282) is located inside the lifting plate (281). The positioning rod (25) abuts against the inner side wall of the lifting plate (281). The engaging strip (283) is located inside the lifting plate (281). The engaging strip (283) meshes with the lifting gear (282). The engaging strip (283) abuts against the inner side wall of the lifting plate (281). The lifting motor (284) is provided on the lifting plate (281). The lifting motor (284) is used to drive the lifting gear (282) to rotate. The material taking mechanism (26) and the material changing box (27) are both located on the engaging strip (283).

6. The twin-tower flow-through air drying device according to claim 5, characterized in that: A drying part (3) is provided in the drying chamber (15). The partition plate (16) is connected to the inner side wall of the drying part (3). A sliding mechanism is provided in the first drying tower (11) and the second drying tower (12). The sliding mechanism includes a driving motor and a driving gear. The driving motor is provided on the side wall of the first drying tower (11). The driving gear is provided at the output end of the driving motor. A driving groove is formed on the bottom wall of the drying chamber (15). The driving gear is located in the driving groove. An engaging rack is provided on the bottom wall of the drying part (3). The driving gear meshes with the engaging rack.

7. The dual-tower flow-through air drying device according to claim 6, wherein: Sealing plates (35) are provided on the bottom walls of the first drying tower (11) and the second drying tower (12). The sealing plates (35) are connected to the bottom wall of the drying part (3). The driving gear and the driving motor are both provided on the side of the sealing plate (35) close to the drying part (3).

8. A double-tower flow-through air drying device according to claim 4, characterized in that: A number of material changing plates (22) are provided in the material changing box (27). The number of the material changing plates (22) is the same as the number of the partition plates (16) in the first drying tower (11) or the second drying tower (12). A pushing block (37) is provided on the side wall of the material changing box (27). A pushing cylinder (38) is provided on the top wall of the pushing block (37). The pushing cylinder (38) is arranged in the direction towards the material changing plate (22). The pushing cylinder (38) is used to push the material changing plate (22) into the drying chamber (15).

9. The dual-tower flow-through air drying device according to claim 4, characterized in that: A positioning magnet (39) is provided on the side wall of the material changing box (27). An engaging magnet (391) is provided on the side wall of the first drying tower (11) or the second drying tower (12) close to the material changing box (27). The positioning magnet (39) and the engaging magnet (391) are magnetically attracted to each other.

10. The dual-tower flow-through air drying device according to claim 9, characterized in that: There are four positioning magnets (39) provided, and the four positioning magnets (39) are arranged at the side wall corners of the charging box (27). The connecting magnet (391) is correspondingly arranged on the side wall of the first drying tower (11) or the second drying tower (12) close to the positioning magnet (39).

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