Composite shaft and drying equipment provided with same
Through the composite shaft structure combined with heat conduction and convection mass transfer, the problems of low efficiency and large VOCs in existing drying equipment are solved, and an efficient and low-cost material drying process is achieved.
Patent Information
- Application Number
- CN202410002653.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-02
- Publication Date
- 2025-07-04
AI Technical Summary
The existing drying equipment has problems such as low drying efficiency, high operating cost and large VOCs. Especially during the deep drying of SBC elastomer, the equipment of the vibration fluidized bed drying method has high faults, the track-type drying method has low thermal efficiency and large gas-solid entrainment.
The composite shaft structure is adopted, combining heat conduction and convective mass transfer methods for drying. The gas medium channel and wedge-shaped blade group between the inner shaft tube and the outer shaft tube are used to achieve efficient drying of materials through the gas medium distributor and the thermal medium circulation system to reduce VOCs emissions.
It improves drying efficiency, reduces VOCs emissions, and heats or cools the materials by adjusting the temperature of the thermal medium, reducing production costs.
Smart Images
Figure CN120252297A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a composite shaft and a drying device provided with the composite shaft. Background Art
[0002] After being dehydrated in the previous process, the SBC elastomer still contains 3.5%-5% of moisture and needs to be deeply dried. At present, the SBC elastomer deep drying process generally selects two methods: vibrating fluidized bed drying and track drying. The vibrating fluidized bed drying method has high equipment failure rate, high requirements for the particle size of the dried material, short residence time of the material in the drying area, and poor drying effect; the track drying method has low thermal efficiency, large floor area, high investment cost, and high maintenance frequency. In addition, in the above two existing technologies, the gas flow rate is very large during the material drying process, so the gas-solid entrainment amount is also more, and thus the amount of VOCs generated by the drying system is also larger. Therefore, the existing technology generates a large amount of VOCs, that is, the total amount of tail gas is large, and a lot of powdery materials are carried away, thus increasing the production cost; on the one hand, it brings material loss, and on the other hand, it greatly increases the cost of tail gas treatment. To sum up, the existing drying equipment has defects such as low drying efficiency, high operating cost, and large amount of VOCs generated by the system. Summary of the Invention
[0003] The present invention solves the deficiencies of the existing technology and provides a composite shaft and a drying device provided with the composite shaft that can improve the drying efficiency and reduce the amount of VOCs.
[0004] To achieve the above object, the technical solution adopted by the present invention is as follows:
[0005] A composite shaft includes a composite shaft body; the composite shaft body includes an inner shaft tube, an outer shaft tube, and a wedge-shaped blade group. Both the inner shaft tube and the outer shaft tube are hollow shafts; the inner shaft tube is coaxially arranged inside the outer shaft tube, and a gap is provided between the outer shaft tube and the inner shaft tube to form a gas medium channel with both ends open. One end of the gas medium channel is an air inlet and the other end is an air outlet. A gas medium distributor for communicating the gas medium channel with the outside of the outer shaft tube is arranged on the side wall of the outer shaft tube; one end of the inner shaft tube is open and the other end is closed. A partition is arranged in the inner cavity of the inner shaft tube along the length direction. The partition divides the inner cavity of the inner shaft tube into an independent inlet channel and an outlet channel along the axial direction. An opening for communicating the inlet channel and the outlet channel is provided on the partition near the closed end of the inner shaft tube; on the outer side wall of the outer shaft tube, multiple groups of wedge-shaped blade groups are uniformly fixed along the axial direction of the outer shaft tube. Each group of wedge-shaped blade groups includes multiple wedge-shaped blades uniformly distributed along the circumferential direction of the outer shaft tube. A cavity is formed inside the wedge-shaped blade to form a liquid medium cavity. One end of the liquid medium cavity of the wedge-shaped blade is provided with a liquid inlet and the other end is provided with a liquid outlet. The liquid inlet and the liquid outlet of the wedge-shaped blade are respectively communicated with the inlet channel and the outlet channel of the inner shaft tube.
[0006] The gas medium flows into the gas medium channel and then into the outside of the outer shaft tube through the gas medium distributor, and enters the material outside the outer shaft tube, so as to realize the drying of the material by convective mass transfer; the inlet channel and the outlet channel are respectively connected to the outlet and the inlet of the heat medium circulation system, and the heat medium sequentially flows through the inlet channel of the inner shaft tube, the liquid inlet of the wedge-shaped paddle, the liquid medium cavity of the wedge-shaped paddle, the liquid outlet of the wedge-shaped paddle and the outlet channel to realize the circulation of the heat medium inside the composite shaft body and the wedge-shaped paddle. During the process of stirring the material, the heat medium in the liquid medium cavity of the wedge-shaped paddle exchanges heat with the material, and realizes the heating or cooling of the material by heat conduction. When heating the material, the combination of heat conduction and convective mass transfer can also realize the drying of the material, and the drying efficiency of this drying method is high. The air source of the gas medium distributor is air or nitrogen. The heat medium is water or oil.
[0007] In this embodiment, the outer shaft tube includes a plurality of short tubes and a plurality of connecting tubes. The inner and outer diameters of the short tubes and the connecting tubes are the same. A plurality of annular support frames arranged axially are fixed on the outer side wall of the inner shaft tube. The support frames extend radially along the inner shaft tube, and the height of the radial extension of the support frames matches the height of the gas medium channel. Two connecting tubes coaxially sleeved outside the inner shaft tube are fixed on both sides of the support frame. A short tube coaxially sleeved outside the inner shaft tube is arranged between adjacent support frames, and the short tube connects the connecting tubes on adjacent support frames; a plurality of liquid medium channels arranged radially are provided inside the support frame. The liquid medium channels include a liquid medium inlet channel and a liquid medium outlet channel. The liquid medium inlet channel connects the liquid inlet of the wedge-shaped paddle and the inlet channel, and the liquid medium outlet channel connects the liquid outlet of the wedge-shaped paddle and the outlet channel.
[0008] The liquid medium channels inside the support frame realize the connection between the wedge-shaped paddle and the inner shaft tube. The outer shaft tube formed by combining a plurality of short tubes and a plurality of connecting tubes has higher strength than an integrally formed single outer shaft tube, so the strength of the composite shaft body is ensured. End supports are provided between the two ends of the composite shaft body, the outer shaft tube and the inner shaft tube, and the setting of the end supports further ensures the strength of the composite shaft body.
[0009] In this embodiment, the support frame further includes support members. At the positions corresponding to the liquid medium channels, the support frame extends radially along the inner shaft tube to form a plurality of support members connecting the inner shaft tube. The liquid medium channels are arranged inside the support members, and the support members are evenly arranged circumferentially along the inner shaft tube; a gap communicating the internal spaces of the short tubes on both sides is arranged between two adjacent support members in the same support frame.
[0010] In this embodiment, the outer sidewall of the outer shaft tube is sequentially set as a first functional area, a second functional area, and a third functional area along the advancing direction of the material, and the gas medium distributor is distributed on the first functional area and the second functional area.
[0011] The materials in the first functional area and the second functional area are dried by a combination of convective mass transfer and heat conduction. The materials reaching the third functional area after passing through the first functional area and the second functional area are already close to the dried state. At this time, the convective mass transfer method has a very low drying efficiency for the materials, and the gas medium is likely to carry away the powdery materials. Therefore, in this embodiment, the materials are deeply dried only by heat conduction in the third functional area, which can not only improve the drying efficiency, but also reduce the emission of VOCs and improve the utilization rate of the gas medium.
[0012] In this embodiment, a group of gas medium distributors is arranged at the central position between two adjacent wedge-shaped paddle blade groups. Each group of gas medium distributors includes at least three gas medium distributors evenly distributed along the circumferential direction of the outer shaft tube.
[0013] In this embodiment, the gas medium distributor includes an arc-shaped plate distributor and a conical tube distributor; the arc-shaped plate distributor is distributed in the first functional area, and the conical tube distributor is distributed in the second functional area; the arc-shaped plate distributor is sleeved and fixed on the outer sidewall of the short tube. A plurality of third ventilation holes are arranged in the area corresponding to the arc-shaped plate distributor on the sidewall of the short tube in the first functional area. A plurality of first ventilation holes are arranged in the area corresponding to the third ventilation holes on the arc-shaped plate distributor. The gas medium in the gas medium channel flows out through the third ventilation holes and the first ventilation holes.
[0014] Second ventilation holes are arranged in the area corresponding to the conical tube distributor on the sidewall of the short tube in the second functional area. The conical tube distributor includes an inner liner and an outer cover from the inside to the outside. The inner liner is fixed on the short tube. The inner liner is provided with an inner cavity. The bottom of the inner liner is provided with an air inlet connected to the second ventilation holes. A plurality of air flow distribution holes are arranged on the inner wall of the inner liner. The outer cover is sleeved outside the inner liner. The gap between the inner wall of the outer cover and the outer wall of the inner liner forms an air flow channel; the gas medium in the gas medium channel sequentially passes through the second ventilation holes, the inner liner, and the air flow distribution holes and then flows out through the air flow channel.
[0015] Among them, the conical tube distributor further includes a cap head. The cap head is arranged at the bottom of the inner liner. The bottom of the cap head is provided with a thread. A nut matching the cap head is arranged on the sidewall of the outer shaft tube. The conical tube distributor is fixed on the nut by the thread.
[0016] In this embodiment, the arc-shaped plate distributor in the first functional area has a large area, and the third ventilation holes on the arc-shaped plate distributor are evenly distributed. Therefore, the arc-shaped plate distributor strengthens the convective mass transfer function between the gas medium and the material. The arc-shaped plate distributor forms a first heating and fluidization chamber between two adjacent wedge-shaped blades. The material has fluidization characteristics under the action of the airflow in the first heating and fluidization chamber, increasing the heat transfer coefficient and improving the drying efficiency of the equipment.
[0017] The conical tube distributor in the second functional area forms a second heating and fluidization chamber between two adjacent wedge-shaped blades. The material has fluidization characteristics under the action of the airflow and the conical tube stirring in the heating and fluidization chamber, increasing the heat transfer coefficient and improving the drying efficiency of the equipment; after the material passes through the first functional area, its wet bulb degree becomes smaller and the powdery material becomes more; and the outer cover prevents the powdery material from being squeezed into the conical tube distributor and the composite shaft body, thereby affecting the flow of the gas medium.
[0018] The first functional area section realizes strong convective mass transfer and heat conduction, and the second functional area realizes stirring, convective mass transfer and heat conduction; the material in the first functional area has a lot of moisture, so the method of combining strong convective mass transfer and heat conduction is adopted to achieve the highest drying efficiency; the wet bulb degree of the material entering the second functional area decreases, and the powdery material becomes more, so the drying of the material is realized through the conical tube distributor.
[0019] In this embodiment, the arc-shaped plate distributor is embedded on the outer side wall of the short tube, and the height of the arc-shaped plate distributor is flush with the height of the outer side wall of the short tube; the dimension of the arc-shaped plate distributor along the axial direction of the outer shaft tube matches the axial dimension of the short tube. Among them, the arc-shaped plate distributor can be fixed on the side wall of the connecting pipe by bolt connection or welding.
[0020] The setting that the height of the arc-shaped plate distributor is flush with the outer wall height of the outer shaft tube avoids the formation of a step between the arc-shaped plate distributor and the outer wall of the outer shaft tube, thereby avoiding the accumulation of powdery materials; and the dimension of the arc-shaped plate distributor along the axial direction of the outer shaft tube ensures that enough first ventilation holes can be arranged on the arc-shaped plate distributor, thereby ensuring the effect of convective mass transfer.
[0021] In this embodiment, the radial height of the conical tube distributor is 1 / 3 to 2 / 3 of the radial height of the wedge-shaped blade.
[0022] In this embodiment, the wedge-shaped blade is fixed on the outer side wall of the connecting pipe. The wedge-shaped blade includes a scraper and a blade body for pushing the material forward. The blade body is arranged along the circumferential direction of the connecting pipe, and the scraper is vertically arranged and fixed on the end surface of the blade body.
[0023] The gap between the scraper and the inner wall of the horizontal drying cylinder is 10 mm. The top surface of the scraper is not more than 25 mm and not less than 15 mm higher than the top surface of the end plate.
[0024] In this embodiment, the fan-shaped plates of two adjacent wedge-shaped blades on the outer shaft tube in the axial direction are staggered by a set angle. Along the forward direction of the material, the projection of each wedge-shaped blade group on the outer shaft tube in the axial direction coincides with the projection of the previous wedge-shaped blade group on the outer shaft tube in the axial direction after rotating clockwise by a set angle around the center of the outer shaft tube; the set angle is 17°.
[0025] A drying device provided with a composite shaft includes the composite shaft as described in any one of the above embodiments, and further includes a horizontal drying cylinder, and at least one such composite shaft is arranged in the horizontal drying cylinder.
[0026] In this embodiment, it further includes a frame, a micro gas medium outflow device, a gas medium inlet device, and a driving mechanism for driving the composite shaft to rotate. A plurality of composite shafts are arranged in parallel in the horizontal drying cylinder. A feed port is arranged at the top of one end of the inner cavity of the horizontal drying cylinder, and a discharge port is arranged at the bottom of the other end.
[0027] Both ends of the composite shaft body extend out of the horizontal drying cylinder. A second shaft head is coaxially fixed at the closed end of the inner shaft tube of the composite shaft body, and a first shaft head is coaxially fixed at the open end of the inner shaft tube. The first shaft head and the second shaft head are respectively fixed on the frame through bearing seats; the first shaft head is a hollow shaft with one end open and one end closed. The open end of the first shaft head is fixedly connected to the open end of the inner shaft tube. One end of the partition plate of the inner shaft tube extends into the first shaft head, and the partition plate divides the inner cavity of the first shaft head into two channels respectively communicating with the inlet channel and the outlet channel; a liquid medium inlet communicating with the inlet channel and a liquid medium outlet communicating with the outlet channel are arranged on the outer wall of the first shaft head. The first shaft head is inserted into a rotary joint, and the first shaft head is rotatably connected to the rotary joint. The liquid medium inlet and the liquid medium outlet of the first shaft head are respectively connected to the inlet and the outlet of the rotary joint, and the inlet and the outlet of the rotary joint are respectively connected to the outlet and the inlet of the heat medium medium circulation system.
[0028] One end of the horizontal drying cylinder is provided with a gas medium inlet device, and the other end is provided with a micro gas medium outflow device; the gas medium inlet device and the micro gas medium outflow device are fixed on the frame; an air inlet cavity and a micro gas outflow cavity are respectively arranged in the gas medium inlet device and the micro gas medium outflow device. The air inlet of the gas medium channel is connected to the gas medium supply system through the air inlet cavity of the gas medium inlet device, and the air outlet of the gas medium channel is connected to the tail gas treatment device through the micro gas outflow cavity of the micro gas medium outflow device.
[0029] The bearing housing is fixed on the frame through the bearing housing bracket. A gas-solid buffer chamber is formed by the protrusion at the top of the horizontal drying cylinder. A maintenance hole and an air outlet hole are provided on the wall of the gas-solid buffer chamber, and the air outlet hole is connected to the tail gas treatment device.
[0030] The heat medium enters the inlet channel of the inner shaft tube through the outlet of the rotary joint and the inlet of the first shaft head. The heat medium in the composite shaft body flows out through the outlet of the first shaft head and the outlet of the rotary joint. The gas medium flowing out of the gas medium supply system enters the gas medium channel through the sealing cavity of the gas medium inlet cavity. Among them, most of the gas in the gas medium channel flows out through the gas medium distributor and enters the material; the remaining small amount of gas in the gas medium channel drives the dust in the gas medium channel to flow out and enters the tail gas treatment device through the exhaust cavity.
[0031] In this embodiment, the gas medium inlet device is provided with a first inner cavity, a second inner cavity, a third inner cavity and a fourth inner cavity from one end face to the other end face. The inner diameter of the first inner cavity matches the outer diameter of the outer shaft tube, and the outer shaft tube is arranged in the first inner cavity; the intake cavity of the gas medium inlet device is the second inner cavity. A gas medium inlet is provided at the top of the second inner cavity. The inner diameter of the second inner cavity is larger than the outer diameters of the first shaft head and the outer shaft tube. The air inlet of the gas medium channel is arranged in the second inner cavity; the inner diameter of the third inner cavity matches the outer diameter of the first shaft head, and the inner diameter of the fourth inner cavity is larger than the outer diameter of the first shaft head. A seal is provided between the inner wall of the fourth inner cavity and the outer wall of the first shaft head, and the seal realizes the sealing of the air flow medium in the fourth inner cavity; the air inlet of the gas medium channel of the composite shaft body is connected to the gas medium supply system through the gas medium inlet of the second inner cavity;
[0032] The small amount of gas medium outflow device is provided with a fifth inner cavity, a sixth inner cavity, a seventh inner cavity and an eighth inner cavity from one end face to the other end face. The inner diameter of the fifth inner cavity matches the outer diameter of the outer shaft tube, and the outer shaft tube is arranged in the fifth inner cavity; the small amount of gas outflow cavity of the small amount of gas medium outflow device is the sixth inner cavity. The inner diameter of the sixth inner cavity is larger than the outer diameters of the outer shaft tube and the second shaft head. A discharge outlet is provided at the bottom of the sixth inner cavity. The air outlet of the gas medium channel of the composite shaft body is arranged in the sixth inner cavity; the inner diameter of the seventh inner cavity matches the outer diameter of the second shaft head; the inner diameter of the eighth inner cavity is larger than the outer diameter of the second shaft head. A seal is provided between the inner wall of the eighth inner cavity and the outer wall of the second shaft head, and the seal realizes the sealing of the air flow medium in the eighth inner cavity; the air outlet of the gas medium channel of the composite shaft body is connected to the tail gas treatment device through the discharge outlet of the sixth inner cavity.
[0033] In this embodiment, a honeycomb jacket is further included. The honeycomb jacket is arranged on the outer wall of the horizontal drying cylinder. One end of the honeycomb jacket is provided with an inlet, and the other end is provided with an outlet. The liquid medium inlet of the honeycomb jacket is connected to the outlet of the rotary joint, and the outlet of the honeycomb jacket is connected to the inlet of the liquid medium circulation system. The honeycomb jacket can heat or cool the material outside the horizontal drying cylinder.
[0034] In summary, a composite shaft and a drying device provided with the composite shaft according to the present device solution have the following beneficial effects.
[0035] 1. On the one hand, the combination of heat conduction and convective mass transfer improves the drying efficiency of the material. The gas medium flows into the gas medium channel and flows into the outside of the outer shaft tube through the gas medium distributor and enters the material outside the outer shaft tube, thereby realizing the drying of the material through the convective mass transfer method; the inlet channel and the outlet channel are respectively connected to the outlet and the inlet of the heat medium medium circulation system. The heat medium medium sequentially passes through the inlet channel of the inner shaft tube, the liquid inlet of the wedge-shaped paddle, the liquid medium cavity of the wedge-shaped paddle, the liquid outlet of the wedge-shaped paddle and the outlet channel to realize the circulation of the heat medium medium in the composite shaft body and the liquid medium cavity of the wedge-shaped paddle. During the process of stirring the material, the heat medium medium in the liquid medium cavity of the wedge-shaped paddle exchanges heat with the material to be dried, and the heating or cooling of the material is realized through the heat conduction method; the combination of heat conduction and convective mass transfer improves the drying efficiency of the material.
[0036] 2. The arc-shaped plate distributor in the first functional area has a large area, and the third ventilation holes on the arc-shaped plate distributor are evenly distributed. Therefore, the arc-shaped plate distributor strengthens the convective mass transfer function between the gas medium and the material. The arc-shaped plate distributor forms a first heating and fluidization chamber between two adjacent wedge-shaped paddles. The material has a fluidization characteristic under the action of the airflow in the first heating and fluidization chamber, increasing the heat transfer coefficient and improving the drying efficiency of the equipment.
[0037] The conical tube distributor in the second functional area forms a second heating and fluidization chamber between two adjacent wedge-shaped paddles. The material has a fluidization characteristic under the action of the airflow and the conical tube stirring in the heating and fluidization chamber, increasing the heat transfer coefficient and improving the drying efficiency of the equipment; after the material passes through the first functional area, its wet bulb degree becomes smaller and the powdery material becomes more; and the outer cover prevents the powdery material from being squeezed into the conical tube distributor and the composite shaft body, thereby affecting the flow of the gas medium.
[0038] Therefore, on the premise of improving the drying efficiency, the present application also reduces the VOCs emission and prevents dust from entering the composite shaft body.
[0039] 3. The heating or cooling of the material can be realized by adjusting the temperature of the heat medium medium. Description of the Drawings
[0040] Figure 1 It is a schematic structural diagram of the composite shaft body.
[0041] Figure 2 It is Figure 1 a cross-sectional view taken along the a-a section in
[0042] Figure 3 It is Figure 1 a cross-sectional view taken along the b-b section in
[0043] Figure 4 It is an assembly drawing of the wedge-shaped blade
[0044] Figure 5 It is Figure 4 a cross-sectional view taken along the a-a section in
[0045] Figure 6 It is Figure 4 a cross-sectional view taken along the c-c section in
[0046] Figure 7 It is a top view of the first gas medium.
[0047] Figure 8 It is Figure 7 a cross-sectional view taken along the a-a section in
[0048] Figure 9 It is a schematic structural diagram of the second gas medium.
[0049] Figure 10 It is an assembly drawing of the support frame and the short pipe.
[0050] Figure 11 It is a schematic diagram of the arrangement of the wedge-shaped blades.
[0051] Figure 12 It is a schematic structural diagram of the gas medium inlet device.
[0052] Figure 13 It is a schematic structural diagram of the micro gas medium outlet device.
[0053] Figure 14 It is a schematic structural diagram of this material drying device.
[0054] In the figure, 1 is the frame; 2 is the horizontal drying cylinder; 3 is the composite shaft body; 4 is the bearing seat; 5 is the bearing seat bracket; 6 is the gas medium inlet device; 7 is the seal; 8 is the rotary joint; 9 is the gas-solid buffer chamber; 10 is the reduction gearbox; 11 is the motor; 12 is the feed inlet; 13 is the discharge outlet; 14 is the inspection hole; 15 is the air outlet; 16 is the honeycomb jacket; 17 is the micro gas medium outflow device; 18 is the wedge-shaped paddle; 19 is the arc-shaped plate distributor; 20 is the outer shaft tube; 21 is the inner shaft tube; 22 is the partition; 23 is the first shaft head; 24 is the inner liner; 25 is the outer cover; 26 is the cap head; 27 is the conical tube distributor; 28 is the support plate; 29 is the first inner cavity; 30 is the second inner cavity; 31 is the third inner cavity; 32 is the fourth inner cavity; 33 is the paddle body; 34 is the gas medium channel; 35 is the inlet channel; 36 is the outlet channel; 37 is the liquid medium channel; 38 is the end bracket; 39 is the second shaft head; 40 is the scraper; 41 is the fifth inner cavity; 42 is the sixth inner cavity; 43 is the seventh inner cavity; 44 is the eighth inner cavity; 45 is the support member; 46 is the connecting pipe; 47 is the support frame; 48 is the short pipe; 49 is the first ventilation hole; 50 is the second ventilation hole; 51 is the third ventilation hole. Detailed implementation manners
[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0056] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.
[0057] Embodiment 1
[0058] As Figures 1 to 13As shown in the figure, the present invention provides a composite shaft, which includes a composite shaft body 3; the composite shaft body 3 includes an inner shaft tube 21, an outer shaft tube 20 and a group of wedge-shaped blades 18. Both the inner shaft tube 21 and the outer shaft tube 20 are hollow shafts. The inner shaft tube 21 is coaxially arranged inside the outer shaft tube 20. A gap is provided between the outer shaft tube 20 and the inner shaft tube 21 to form a gas medium channel 34 with both ends open. One end of the gas medium channel 34 is an air inlet and the other end is an air outlet. A gas medium distributor for communicating the gas medium channel 34 with the outside of the outer shaft tube 20 is provided on the side wall of the outer shaft tube 20. One end of the inner shaft tube 21 is open and the other end is closed. A partition 22 arranged along the length direction is provided inside the inner cavity of the inner shaft tube 21. The partition 22 axially divides the inner cavity of the inner shaft tube 21 into an independent inlet channel 35 and an outlet channel 36. An opening for communicating the inlet channel 35 and the outlet channel 36 is provided on the partition 22 near the closed end of the inner shaft tube 21. End supports 38 are provided between the two ends of the composite shaft body 3, the outer shaft tube 20 and the inner shaft tube 21. Among them, the air source of the gas medium distributor uses air or nitrogen.
[0059] On the outer side wall of the outer shaft tube 20, a plurality of groups of wedge-shaped blades 18 are uniformly fixed along the axial direction of the outer shaft tube 20. Each group of wedge-shaped blades 18 includes a plurality of wedge-shaped blades 18 uniformly distributed along the circumferential direction of the outer shaft tube 20. A cavity is provided inside the wedge-shaped blade 18 to form a liquid medium cavity. One end of the liquid medium cavity of the wedge-shaped blade 18 is provided with a liquid inlet and the other end is provided with a liquid outlet. The liquid inlet and the liquid outlet of the wedge-shaped blade 18 are respectively communicated with the inlet channel 35 and the outlet channel 36 of the inner shaft tube 21. Among them, the heat transfer medium is water or oil.
[0060] The outer shaft tube 20 includes a plurality of short tubes 48 and a plurality of connecting tubes 46. The inner and outer diameters of the short tubes 48 and the connecting tubes 46 are the same. A plurality of annular support frames 47 arranged along the axial direction are fixed on the outer side wall of the inner shaft tube 21. The support frames 47 extend radially along the inner shaft tube 21. The height of the radial extension of the support frames 47 matches the height of the gas medium channel 34. Two connecting tubes 46 coaxially sleeved outside the inner shaft tube 21 are fixed on both sides of the support frames 47. A short tube 48 coaxially sleeved outside the inner shaft tube 21 is provided between adjacent support frames 47. The short tube 48 connects the connecting tubes 46 on adjacent two support frames 47. A plurality of liquid medium channels 37 arranged along the radial direction are provided inside the support frames 47. The liquid medium channels 37 include a liquid medium inflow channel and a liquid medium outflow channel 36. The liquid medium inflow channel communicates the liquid inlet of the wedge-shaped blade 18 and the inlet channel 35. The liquid medium outflow channel 36 communicates the liquid outlet of the wedge-shaped blade 18 and the outlet channel 36.
[0061] The liquid medium channel 37 inside the support frame 47 realizes the connection between the wedge-shaped blade 18 and the inner shaft tube 21. Moreover, the outer shaft tube 20 formed by combining multiple short tubes 48 and multiple connecting tubes 46 has higher strength than an integrally formed single outer shaft tube 20. Therefore, the strength of the composite shaft body 3 is ensured. The support frame 47 further includes a support member 45. At positions corresponding to the liquid medium channel 37, the support frame 47 extends radially along the inner shaft tube 21 to form multiple support members 45 connecting the inner shaft tube 21. The liquid medium channel 37 is arranged inside the support member 45, and the support members 45 are evenly arranged circumferentially along the inner shaft tube 21. A gap communicating the internal spaces of the short tubes 48 on both sides is provided between two adjacent support members 45 within the same support frame 47.
[0062] The outer side wall of the outer shaft tube 20 is successively set as a first functional area, a second functional area, and a third functional area along the material advancing direction. The gas medium distributor is distributed on the first functional area and the second functional area.
[0063] A set of gas medium distributor groups is arranged at the central position between adjacent two groups of wedge-shaped blades 18. Each set of gas medium distributor groups includes at least three gas medium distributors evenly distributed circumferentially along the outer shaft tube 20.
[0064] The gas medium distributor includes an arc-shaped plate distributor 19 and a conical tube distributor 27. The arc-shaped plate distributor 19 is distributed in the first functional area, and the conical tube distributor 27 is distributed in the second functional area. The arc-shaped plate distributor 19 is sleeved and fixed on the outer side wall of the short tube 48. Multiple third ventilation holes 51 are provided in the area corresponding to the arc-shaped plate distributor 19 on the side wall of the short tube 48 in the first functional area. Multiple first ventilation holes 49 are provided in the area corresponding to the third ventilation holes 51 on the arc-shaped plate distributor 19. The gas medium in the gas medium channel 34 flows out through the third ventilation holes 51 and the first ventilation holes 49. The arc-shaped plate distributor 19 is embedded in the outer side wall of the short tube 48, and the height of the arc-shaped plate distributor 19 is flush with the height of the outer side wall of the short tube 48. The dimension of the arc-shaped plate distributor 19 along the axial direction of the outer shaft tube 20 matches the axial dimension of the short tube 48. Among them, the arc-shaped plate distributor 19 can be fixed on the side wall of the connecting tube 46 by bolt connection or welding.
[0065] On the side wall of the short tube 48 in the second functional area, a second ventilation hole 50 is provided in the area corresponding to the conical tube distributor 27. The conical tube distributor 27 includes a cap head 26, an inner liner 24, and an outer cover 25 from the inside to the outside. The inner liner 24 is fixed on the short tube 48. The inner liner 24 is provided with an inner cavity. An air inlet connected to the second ventilation hole 50 is provided at the bottom of the inner liner 24. A plurality of air flow distribution holes are provided on the wall of the inner liner 24. The outer cover 25 is sleeved outside the inner liner 24, and the inner wall of the outer cover 25 and the outer wall of the inner liner 24 are fixed through a connecting member. The cap head 26 is provided at the bottom of the inner liner 24. A thread is provided at the bottom of the cap head 26. A nut matching the cap head 26 is provided on the side wall of the outer shaft tube 20. The conical tube distributor 27 is fixed on the nut through a thread. A gap between the inner wall of the outer cover 25 and the outer wall of the inner liner 24 forms an air flow channel; the gas medium in the gas medium channel 34 flows out through the air flow channel after passing through the second ventilation hole 50, the inner liner 24, and the air flow distribution holes in sequence. Among them, the radial height of the conical tube distributor 27 is 1 / 3 to 2 / 3 of the radial height of the wedge-shaped blade 18.
[0066] The wedge-shaped blade 18 is fixed on the outer side wall of the connecting tube 46. The wedge-shaped blade 18 includes a scraping plate 40 and a blade main body 33 for pushing the material forward. The blade main body 33 is arranged along the circumferential direction of the connecting tube 46. The scraping plate 40 is vertically arranged and fixed on the end face of the blade main body 33. The gap between the scraping plate 40 and the inner side wall of the horizontal drying cylinder 2 is 10 mm. The top surface of the scraping plate 40 is not more than 25 mm and not less than 15 mm higher than the top surface of the end plate. The fan-shaped plates of two adjacent wedge-shaped blades 18 on the outer shaft tube 20 in the axial direction are staggered by a set angle. Along the material advancing direction, the projection of each group of wedge-shaped blades 18 on the outer shaft tube 20 in the axial direction coincides with the projection of the previous group of wedge-shaped blades 18 on the outer shaft tube 20 in the axial direction after rotating clockwise by a set angle around the center of the outer shaft tube 20; the set angle is 17°.
[0067] Embodiment 2
[0068] The present invention also provides a drying device provided with a composite shaft, including the composite shaft as described in any one of the above embodiments, and further including a horizontal drying cylinder 2. A composite shaft is arranged in the horizontal drying cylinder 2.
[0069] It further includes a frame 1, a micro gas medium outflow device 17, a gas medium inlet device 6, and a driving mechanism for driving the composite shaft to rotate. A feed port 12 is provided at the top of one end of the inner cavity of the horizontal drying cylinder 2, and a discharge port 13 is provided at the bottom of the other end.
[0070] Both ends of the composite shaft body 3 extend out of the horizontal drying cylinder 2. A second shaft head 39 is coaxially fixed to the closed end of the inner shaft tube 21 of the composite shaft body 3. A first shaft head 23 is coaxially fixed to the open end of the inner shaft tube 21. The first shaft head 23 and the second shaft head 39 are respectively fixed to the frame 1 through bearing seats 4. The second shaft head 39 is connected to the output end of a driving mechanism fixed to the frame 1. The first shaft head 23 is a hollow shaft with one end open and one end closed. The open end of the first shaft head 23 is fixedly connected to the open end of the inner shaft tube 21. One end of the partition plate 22 of the inner shaft tube 21 extends into the first shaft head 23. The partition plate 22 divides the inner cavity of the first shaft head 23 into two channels respectively communicating with the inlet channel 35 and the outlet channel 36. A liquid medium inlet communicating with the inlet channel 35 and a liquid medium outlet communicating with the outlet channel 36 are provided on the outer wall of the first shaft head 23. The first shaft head 23 is inserted into a rotary joint 8. The first shaft head 23 is rotatably connected to the rotary joint 8. The liquid medium inlet and the liquid medium outlet of the first shaft head 23 are respectively connected to the inlet and the outlet of the rotary joint 8. The inlet and the outlet of the rotary joint 8 are respectively connected to the outlet and the inlet of a heat medium medium circulation system.
[0071] A gas medium inlet device 6 is provided at one end of the horizontal drying cylinder 2, and a micro gas medium outlet device 17 is provided at the other end. The gas medium inlet device 6 and the micro gas medium outlet device 17 are fixed to the frame 1. An air inlet cavity and a micro gas outlet cavity are respectively provided in the gas medium inlet device 6 and the micro gas medium outlet device 17. The air inlet of the gas medium channel 34 is connected to a gas medium supply system through the air inlet cavity of the gas medium inlet device 6. The air outlet of the gas medium channel 34 is connected to a tail gas treatment device through the micro gas outlet cavity of the micro gas medium outlet device 17.
[0072] The bearing seat 4 is fixed to the frame 1 through a bearing seat bracket 5. The driving mechanism includes a motor 11 and a speed reducer 10. The output end of the motor 11 is connected to the second shaft head 39 through the speed reducer 10. A gas-solid buffer chamber 9 is formed by a protrusion on the top of the horizontal drying cylinder 2. Inspection holes 14 and air outlet holes 15 are provided on the wall of the gas-solid buffer chamber 9. The air outlet holes 15 are connected to a tail gas treatment device.
[0073] The gas medium inlet device 6 is provided with a first inner cavity 29, a second inner cavity 30, a third inner cavity 31, and a fourth inner cavity 32 from one end face to the other end face. The inner diameter of the first inner cavity 29 matches the outer diameter of the outer shaft tube 20, and the outer shaft tube 20 is arranged in the first inner cavity 29. The intake cavity of the gas medium inlet device 6 is the second inner cavity 30. A gas medium inlet is provided at the top of the second inner cavity 30. The inner diameter of the second inner cavity 30 is larger than the outer diameters of the first shaft head 23 and the outer shaft tube 20. The intake port of the gas medium passage 34 is arranged in the second inner cavity 30. The inner diameter of the third inner cavity 31 matches the outer diameter of the first shaft head 23. The inner diameter of the fourth inner cavity 32 is larger than the outer diameter of the first shaft head 23. A seal 7 is arranged between the inner wall of the fourth inner cavity 32 and the outer wall of the first shaft head 23. The seal 7 realizes the sealing of the gas flow medium in the fourth inner cavity 32. The intake port of the gas medium passage 34 of the composite shaft body 3 is connected to the gas medium supply system through the gas medium inlet of the second inner cavity 30.
[0074] The micro gas medium outlet device 17 is provided with a fifth inner cavity 41, a sixth inner cavity 42, a seventh inner cavity 43, and an eighth inner cavity 44 from one end face to the other end face. The inner diameter of the fifth inner cavity 41 matches the outer diameter of the outer shaft tube 20, and the outer shaft tube 20 is arranged in the fifth inner cavity 41. The micro gas outlet cavity of the micro gas medium outlet device 17 is the sixth inner cavity 42. The inner diameter of the sixth inner cavity 42 is larger than the outer diameters of the outer shaft tube 20 and the second shaft head 39. A discharge outlet is provided at the bottom of the sixth inner cavity 42. The outlet port of the gas medium passage 34 of the composite shaft body 3 is arranged in the sixth inner cavity 42. The inner diameter of the seventh inner cavity 43 matches the outer diameter of the second shaft head 39. The inner diameter of the eighth inner cavity 44 is larger than the outer diameter of the second shaft head 39. A seal 7 is arranged between the inner wall of the eighth inner cavity 44 and the outer wall of the second shaft head 39. The seal 7 realizes the sealing of the gas flow medium in the eighth inner cavity 44. The outlet port of the gas medium passage 34 of the composite shaft body 3 is connected to the tail gas treatment device through the discharge outlet of the sixth inner cavity 42.
[0075] It further includes a honeycomb jacket 16. The honeycomb jacket 16 is arranged on the outer wall of the horizontal drying cylinder 2. One end of the honeycomb jacket 16 is provided with an inlet, and the other end is provided with an outlet. The liquid medium inlet of the honeycomb jacket 16 is connected to the outlet of the rotary joint 8, and the outlet of the honeycomb jacket 16 is connected to the inlet of the liquid medium circulation system.
[0076] Working process:
[0077] Materials enter the horizontal drying cylinder 2 from the feed inlet 12. The driving mechanism drives the composite shaft to drive the wedge-shaped paddle 18 to rotate, and the wedge-shaped paddle 18 pushes the materials forward. During the forward movement of the materials, the gas medium supply system supplies the gas medium into the gas medium passage 34 through the gas medium inlet device 6. The gas medium in the gas medium passage 34 is divided into two parts according to functions. The first functional part performs convective mass transfer on the materials in the drying cylinder through the arc-shaped plate distributor 19 and the conical tube distributor 27, and enters the tail gas treatment device through the air outlet hole 15. The second functional part is that a small amount of gas medium takes the dust in the composite shaft cavity out of the exhaust cavity and enters the tail gas treatment device.
[0078] Meanwhile, the heat medium enters from the outlet of the heat medium circulation system and successively passes through the inlet of the rotary joint 8, the inlet passage 35, the outlet passage 36, and the outlet of the rotary joint 8 and flows into the inlet of the heat medium circulation system; in the inner shaft tube 21, the heat medium in the inlet passage 35 successively passes through the liquid inlet of the wedge-shaped paddle 18, the liquid medium cavity of the wedge-shaped paddle 18, and the liquid outlet of the wedge-shaped paddle 18 and returns to the outlet passage 36. The heat medium in the wedge-shaped paddle 18 exchanges heat with the materials to realize the cooling or heating of the materials.
[0079] During the drying process, the wet bulb degree of the materials corresponding to the position of the first functional area is large. The arc-shaped plate distributor 19 is provided with a larger distribution hole area to strengthen the convective mass transfer of the materials, and the wedge-shaped paddle 18 simultaneously heats and conducts the materials. After the wet bulb degree of the materials entering the second functional area decreases, under the stirring action of the conical tube distributor 27, the mass transfer and heat transfer coefficient of the materials is increased, further improving the drying efficiency. After the materials enter the third functional area, their wet bulb degree further decreases, and it is more difficult for the volatile components inside the materials to escape. Therefore, the third functional area preferably uses heating and conduction for devolatilization drying. In this way, the drying efficiency of the equipment system with a composite shaft is high, and at the same time, the VOCs discharge is reduced.
[0080] Example 3
[0081] Two composite shafts are arranged in parallel in the horizontal drying cylinder 2. The driving mechanism drives the synchronous rotation of the two composite shafts through the transmission mechanism.
[0082] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.
Claims
1. A composite shaft, characterized in that: Comprising a composite shaft body (3); the composite shaft body (3) includes an inner shaft tube (21), an outer shaft tube (20) and a set of wedge-shaped blades, both the inner shaft tube (21) and the outer shaft tube (20) are hollow shafts; the inner shaft tube (21) is coaxially arranged inside the outer shaft tube (20), and a gap is provided between the outer shaft tube (20) and the inner shaft tube (21) to form a gas medium channel (34) with both ends open, one end of the gas medium channel (34) is an air inlet and the other end is an air outlet, and a gas medium distributor for communicating the gas medium channel (34) with the outside of the outer shaft tube (20) is provided on the side wall of the outer shaft tube (20); one end of the inner shaft tube (21) is open and the other end is closed, and a partition plate (22) arranged along the length direction is provided inside the inner cavity of the inner shaft tube (21), and the partition plate (22) axially divides the inner cavity of the inner shaft tube (21) into an independent inlet channel (35) and an outlet channel (36), and an opening for communicating the inlet channel (35) and the outlet channel (36) is provided on the partition plate (22) near the closed end of the inner shaft tube (21); multiple sets of wedge-shaped blade groups are uniformly fixed on the outer side wall of the outer shaft tube (20) along the axial direction of the outer shaft tube (20), each set of wedge-shaped blade groups includes a plurality of wedge-shaped blades (18) uniformly distributed along the circumferential direction of the outer shaft tube (20), a cavity is provided inside the wedge-shaped blade (18) to form a liquid medium cavity, a liquid inlet is provided at one end of the liquid medium cavity of the wedge-shaped blade (18), and a liquid outlet is provided at the other end, and the liquid inlet and the liquid outlet of the wedge-shaped blade (18) are respectively communicated with the inlet channel (35) and the outlet channel (36) of the inner shaft tube (21).
2. The composite shaft according to claim 1, characterized in that: The outer shaft tube (20) includes a plurality of short tubes (48) and a plurality of connecting tubes (46), the inner and outer diameters of the short tubes (48) and the connecting tubes (46) are the same, and a plurality of annular support frames (47) arranged along the axial direction are fixed on the outer side wall of the inner shaft tube (21), the support frames (47) extend radially along the inner shaft tube (21), the height of the radial extension of the support frames (47) matches the height of the gas medium channel (34), two connecting tubes (46) coaxially sleeved outside the inner shaft tube (21) are fixed on both sides of the support frames (47), and a short tube (48) coaxially sleeved outside the inner shaft tube (21) is provided between adjacent support frames (47), and the short tube (48) connects the connecting tubes (46) on adjacent two support frames (47); A plurality of liquid medium channels (37) arranged along the radial direction are provided inside the support frame (47), the liquid medium channels (37) include a liquid medium inflow channel and a liquid medium outflow channel, the liquid medium inflow channel communicates the liquid inlet of the wedge-shaped blade (18) with the inlet channel (35), and the liquid medium outflow channel communicates the liquid outlet of the wedge-shaped blade (18) with the outlet channel (36).
3. The composite shaft according to claim 2, characterized in that: The support frame (47) further includes support members (45). The support frame (47) forms a plurality of support members (45) that connect the inner shaft tube (21) and extend radially along the inner shaft tube (21) at positions corresponding to the liquid medium channels (37). The liquid medium channels (37) are provided inside the support members (45), and the support members (45) are arranged evenly in the circumferential direction of the inner shaft tube (21). A gap communicating the internal spaces of the short tubes (48) on both sides is provided between two adjacent support members (45) within the same support frame (47).
4. A composite shaft according to claim 2, wherein: The outer side wall of the outer shaft tube (20) is successively set as a first functional area, a second functional area, and a third functional area along the material advancing direction, and the gas medium distributors are distributed on the first functional area and the second functional area.
5. A composite shaft according to claim 2, characterized in that: A group of gas medium distributor groups is provided at the central position between two adjacent wedge-shaped blade groups. Each group of gas medium distributor groups includes at least three gas medium distributors evenly distributed in the circumferential direction of the outer shaft tube (20).
6. A composite shaft according to claim 5, wherein: The gas medium distributor includes an arc-shaped plate distributor (19) and a conical tube distributor (27). The arc-shaped plate distributor (19) is distributed in the first functional area, and the conical tube distributor (27) is distributed in the second functional area. The arc-shaped plate distributor (19) is sleeved and fixed on the outer side wall of the short tube (48). A plurality of third ventilation holes (51) are provided in the area corresponding to the arc-shaped plate distributor (19) on the side wall of the short tube (48) in the first functional area. A plurality of first ventilation holes (49) are provided in the area corresponding to the third ventilation holes (51) on the arc-shaped plate distributor (19). The gas medium in the gas medium channel (34) flows out through the third ventilation holes (51) and the first ventilation holes (49). Second ventilation holes (50) are provided in the area corresponding to the conical tube distributor (27) on the side wall of the short tube (48) in the second functional area. The conical tube distributor (27) includes an inner liner (24) and an outer cover (25) from the inside to the outside. The inner liner (24) is fixed on the short tube (48). The inner liner (24) is provided with an inner cavity. An air inlet connected to the second ventilation holes (50) is provided at the bottom of the inner liner (24). A plurality of air flow distribution holes are provided on the wall of the inner liner (24). The outer cover (25) is sleeved outside the inner liner (24). The gap between the inner wall of the outer cover (25) and the outer wall of the inner liner (24) is fixed by a connecting member, and the gap between the inner wall of the outer cover (25) and the outer wall of the inner liner (24) forms an air flow channel. The gas medium in the gas medium channel (34) flows out through the air flow channel after passing through the second ventilation holes (50), the inner liner (24), and the air flow distribution holes in sequence.
7. A composite shaft according to claim 6, characterized in that: The arc-shaped plate distributor (19) is embedded in the outer side wall of the short tube (48), and the height of the arc-shaped plate distributor (19) is flush with the height of the outer side wall of the short tube (48). The dimension of the arc-shaped plate distributor (19) along the axial direction of the outer shaft tube (20) matches the axial dimension of the short tube (48).
8. A composite shaft according to claim 6, characterized in that: The radial height of the conical tube distributor (27) is 1 / 3 to 2 / 3 of the radial height of the wedge-shaped blade (18).
9. A composite shaft according to claim 2, wherein: The described wedge-shaped blade (18) is fixed on the outer side wall of the connecting pipe (46). The wedge-shaped blade (18) includes a scraping plate (40) and a blade body (33) for pushing the material forward. The blade body (33) is arranged circumferentially along the connecting pipe (46). The scraping plate (40) is perpendicularly arranged and fixed on the end face of the blade body (33).
10. A composite shaft as claimed in claim 9, wherein: The fan-shaped plates of two adjacent wedge-shaped blades (18) on the outer shaft tube (20) in the axial direction are staggered by a set angle from each other.
11. A drying device provided with a composite shaft, comprising a composite shaft according to any one of claims 1-10, characterized in that: It further includes a horizontal drying cylinder (2), and at least one such composite shaft is arranged inside the horizontal drying cylinder (2).
12. A drying device provided with a composite shaft as described in claim 11, characterized in that: It further includes a frame (1), a micro gas medium outflow device (17), a gas medium inlet device (6), and a driving mechanism for driving the rotation of the composite shaft. A feed port (12) is arranged at the top of one end of the inner cavity of the horizontal drying cylinder (2), and a discharge port (13) is arranged at the bottom of the other end. Both ends of the composite shaft body (3) extend out of the horizontal drying cylinder (2). A second shaft head (39) is coaxially fixed at the closed end of the inner shaft tube (21) of the composite shaft body (3), and a first shaft head (23) is coaxially fixed at the open end of the inner shaft tube (21). The first shaft head (23) and the second shaft head (39) are respectively fixed on the frame (1) through bearing seats (4). The first shaft head (23) is a hollow shaft with one end open and one end closed. The open end of the first shaft head (23) is fixedly connected to the open end of the inner shaft tube (21). One end of the partition plate (22) of the inner shaft tube (21) extends into the first shaft head (23). The partition plate (22) divides the inner cavity of the first shaft head (23) into two channels respectively communicating with the inlet channel (35) and the outlet channel (36). A liquid medium inlet communicating with the inlet channel (35) and a liquid medium outlet communicating with the outlet channel (36) are arranged on the outer wall of the first shaft head (23). The first shaft head (23) is inserted into a rotary joint (8). The first shaft head (23) is rotatably connected to the rotary joint (8). The liquid medium inlet and the liquid medium outlet of the first shaft head (23) are respectively connected to the inlet and the outlet of the rotary joint (8). The inlet and the outlet of the rotary joint (8) are respectively connected to the outlet and the inlet of the heat medium medium circulation system. One end of the horizontal drying cylinder (2) is provided with a gas medium inlet device (6), and the other end is provided with a micro gas medium outflow device (17). The gas medium inlet device (6) and the micro gas medium outflow device (17) are fixed on the frame (1). An air inlet cavity and a micro gas outflow cavity are respectively arranged inside the gas medium inlet device (6) and the micro gas medium outflow device (17). The air inlet of the gas medium channel (34) is connected to the gas medium supply system through the air inlet cavity of the gas medium inlet device (6), and the air outlet of the gas medium channel (34) is connected to the tail gas treatment device through the micro gas outflow cavity of the micro gas medium outflow device (17).
13. A drying device provided with a composite shaft according to claim 12, characterized in that: The gas medium inlet device (6) is provided with a first inner cavity (29), a second inner cavity (30), a third inner cavity (31) and a fourth inner cavity (32) from one end face to the other end face. The inner diameter of the first inner cavity (29) matches the outer diameter of the outer shaft tube (20), and the outer shaft tube (20) is arranged in the first inner cavity (29). The air inlet cavity of the gas medium inlet device (6) is the second inner cavity (30). A gas medium inlet is arranged at the top of the second inner cavity (30). The inner diameter of the second inner cavity (30) is larger than the outer diameters of the first shaft head (23) and the outer shaft tube (20). The air inlet of the gas medium channel (34) is arranged in the second inner cavity (30). The inner diameter of the third inner cavity (31) matches the outer diameter of the first shaft head (23). The inner diameter of the fourth inner cavity (32) is larger than the outer diameter of the first shaft head (23). A seal (7) is arranged between the inner wall of the fourth inner cavity (32) and the outer wall of the first shaft head (23). The seal (7) seals the air flow medium in the fourth inner cavity (32). The air inlet of the gas medium channel (34) of the composite shaft body (3) is connected to the gas medium supply system through the gas medium inlet of the second inner cavity (30). The micro gas medium outlet device (17) is provided with a fifth inner cavity (41), a sixth inner cavity (42), a seventh inner cavity (43) and an eighth inner cavity (44) from one end face to the other end face. The inner diameter of the fifth inner cavity (41) matches the outer diameter of the outer shaft tube (20), and the outer shaft tube (20) is arranged in the fifth inner cavity (41). The micro gas outlet cavity of the micro gas medium outlet device (17) is the sixth inner cavity (42). The inner diameter of the sixth inner cavity (42) is larger than the outer diameters of the outer shaft tube (20) and the second shaft head (39). A discharge outlet is arranged at the bottom of the sixth inner cavity (42). The air outlet of the gas medium channel (34) of the composite shaft body (3) is arranged in the sixth inner cavity (42). The inner diameter of the seventh inner cavity (43) matches the outer diameter of the second shaft head (39). The inner diameter of the eighth inner cavity (44) is larger than the outer diameter of the second shaft head (39). A seal (7) is arranged between the inner wall of the eighth inner cavity (44) and the outer wall of the second shaft head (39). The seal (7) seals the air flow medium in the eighth inner cavity (44). The air outlet of the gas medium channel (34) of the composite shaft body (3) is connected to the tail gas treatment device through the discharge outlet of the sixth inner cavity (42).
14. A drying device provided with a composite shaft according to any one of claims 11-13, characterized in that: It further includes a honeycomb jacket (16). The honeycomb jacket (16) is arranged on the outer wall of the horizontal drying cylinder (2). One end of the honeycomb jacket (16) is provided with an inlet, and the other end is provided with an outlet. The liquid medium inlet of the honeycomb jacket (16) is connected to the outlet of the rotary joint (8). The outlet of the honeycomb jacket (16) is connected to the inlet of the liquid medium circulation system.