CN113615856A

CN113615856A - Drying equipment

Info

Publication number: CN113615856A
Application number: CN202110797510.6A
Authority: CN
Inventors: 文秋成; 丁美宙; 孙觅; 彭桂新; 王小飞; 商杭; 张金生; 陈大伟; 王鹏飞; 纪晓楠
Original assignee: China Tobacco Henan Industrial Co Ltd; Changde Tobacco Machinery Co Ltd
Current assignee: China Tobacco Henan Industrial Co Ltd; Changde Tobacco Machinery Co Ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2021-11-09

Abstract

The application discloses a drying device, which comprises a feeding part, a hot air system and a drying part; the drying part comprises a barrel and a central air duct arranged in the barrel, the central air duct extends along the axial direction of the barrel and is coaxial with the central air duct, and a plurality of radial blowing parts are arranged on the wall of the central air duct; the feeding part comprises a conveying belt and an end face fixed at the first end part of the conveying belt, and the cylinder body and the central air cylinder are rotatably arranged at the second end part of the conveying belt; the end face is provided with a feed inlet and a first air inlet, the feed inlet is arranged above the conveying belt, and the first air inlet is communicated with the central air duct; the hot air system comprises a first hot air subsystem, the first hot air subsystem comprises a first hot air heater and a first hot air pipe, the first end of the first hot air pipe is connected with the first hot air heater, and the second end of the first hot air pipe is connected with a first air inlet. The method is beneficial to improving the uniformity, stability and sensory quality of the material drying quality.

Description

Drying equipment

Technical Field

The application relates to the technical field of tobacco manufacturing, and more particularly relates to a drying device.

Background

With the improvement of the technical level of the cigarette industry and the continuous promotion of the cigarette brand scale, higher requirements are put forward on the guarantee of cigarette raw materials. Threshing and redrying are necessary processing processes for changing tobacco leaves from agricultural products to raw materials in the cigarette industry, and play a role in drying materials. The key process technology and equipment level of threshing and redrying are improved, the supply requirement of the tobacco raw materials with stable quality and quality of cigarette industry enterprises is guaranteed, and the method becomes the key for the large-scale continuous healthy development of cigarette brands.

The redrying of tobacco flakes is one of the core technologies in the threshing and redrying process. On one hand, the existing drum-type drying process can simultaneously adopt the conduction heat transfer of the drum wall and the convection heat transfer of hot air for supplying heat, and the material drying heat transfer mode is the conduction-convection composite heat transfer; meanwhile, in the composite heat transfer drying process of the material, the axial motion transmission and the dispersion mixing process of material particles in the drying equipment exist. Therefore, from the characteristics of the process, the drum-type drying has advantages in the uniform dispersion degree of materials, the uniformity of moist hot air, the composite heat transfer efficiency and the drying dehydration efficiency.

For the tobacco flake redrying process, the uniformity of the temperature and humidity state and the air volume distribution of the hot drying air in the roller can obviously influence the drying uniformity of the tobacco flakes in the roller. In the drying process of the roller, when high-temperature hot air blows over the materials, heat and mass are transferred in a convection mode between the materials and the hot air, and the hot air can continuously take away moist hot air in the moist materials before reaching the saturated humidity of the hot air, so that the materials are dried. In the drying process, the temperature and the air quantity of hot air can greatly influence the gasification rate of the surface of the wet material and the diffusion rate of the wet components in the material. The air distribution mode in the existing drum-type drying equipment is that hot air is directly introduced into one end of a drum through an air distributor, and the hot air directly enters the interior of a drum body through small holes in the air distributor and flows in parallel or in countercurrent with materials.

Disclosure of Invention

The application provides a drying equipment, central dryer provide radial hot-blast at 360 within ranges, make whereabouts material homodisperse, reduce material falling speed simultaneously, make hot-blast and material fully contact, be favorable to improving material drying quality's homogeneity, stability and sense organ quality, promote the moisture homogeneity of export material and reduce the blade and make the bits of broken glass.

The application provides a drying device, which comprises a feeding part, a hot air system and a drying part; the drying part comprises a barrel and a central air duct arranged in the barrel, the central air duct extends along the axial direction of the barrel and is coaxial with the central air duct, and a plurality of radial blowing parts are arranged on the wall of the central air duct; the feeding part comprises a conveying belt and an end face fixed at the first end part of the conveying belt, and the cylinder body and the central air cylinder are rotatably arranged at the second end part of the conveying belt; the end face is provided with a feed inlet and a first air inlet, the feed inlet is arranged above the conveying belt, and the first air inlet is communicated with the central air duct; the hot air system comprises a first hot air subsystem, the first hot air subsystem comprises a first hot air heater and a first hot air pipe, the first end of the first hot air pipe is connected with the first hot air heater, and the second end of the first hot air pipe is connected with a first air inlet.

Preferably, the drying equipment further comprises a discharging part and a moisture discharging system; the discharging part is connected with the drying part and comprises an exhaust port; the moisture removing system comprises a moisture removing cover and a moisture removing air duct, the moisture removing cover is connected with the moisture removing air duct, and a first air inlet of the moisture removing cover is connected with an air outlet of the discharging part; the filter screen is arranged in the moisture exhaust cover in a rotating mode, and the air inlet direction of the first air inlet is consistent with the radial direction of the filter screen.

Preferably, the first hot air duct is provided with an auxiliary hot air duct, and the auxiliary hot air duct is connected with a second air inlet of the moisture exhaust cover.

Preferably, the hot air system further comprises a second hot air subsystem, the second hot air subsystem comprises a second hot air heater and a second hot air pipe, a first end of the second hot air pipe is connected with the second hot air heater, a second end of the second hot air pipe is connected with a second air inlet on the end face, and the second air inlet is communicated with the cylinder body.

Preferably, the end face is provided with a second air outlet communicated with the second air inlet, the second air outlet is arranged above the feed inlet, and the second air outlet is communicated with the barrel.

Preferably, the end face comprises an air inlet cavity enclosed by the outer side plate and the inner side plate; the first air inlet and the second air inlet are arranged on the outer side plate, and the second air inlet is communicated with the air inlet cavity; the second air outlet is arranged on the inner side plate and communicated with the air inlet cavity.

Preferably, still be equipped with the third air outlet on the interior curb plate, the third air outlet sets up in the below of feed inlet, and the third air outlet communicates with the barrel.

Preferably, the first air inlet is connected with the central air duct through an air inlet pipeline, the air inlet pipeline penetrates through the air inlet cavity, and a first air outlet is formed at the end part of the air inlet pipeline.

Preferably, the drying apparatus further includes baffles for the first air outlet, the second air outlet, and the third air outlet, respectively.

Preferably, the drying apparatus further comprises air volume adjusting devices respectively used for the first air outlet, the second air outlet and the third air outlet.

Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a structural diagram of a drying apparatus provided in the present application;

fig. 2 is a structural view of a drying apparatus provided in the present application, in which at least a drum is removed;

FIG. 3 is a primary block diagram of the hot air system and moisture removal system provided herein;

4-7 are front, left, top, and perspective views, respectively, of one embodiment of an end face provided herein;

FIG. 8 is a block diagram of the moisture removal system and the discharge housing provided herein;

FIG. 9 is a block diagram of a moisture excluding hood provided by the present application;

FIG. 10 is a block diagram of one embodiment of a center air duct provided herein;

FIG. 11 is a block diagram of a preferred embodiment of FIG. 10;

fig. 12 and 13 are block diagrams of another embodiment of a center air duct provided herein;

FIG. 14 is a block diagram of one embodiment of a cartridge provided herein;

FIG. 15 is a block diagram of another embodiment of a cartridge provided herein;

FIG. 16 is a block diagram of yet another embodiment of a cartridge provided herein;

FIG. 17 is a block diagram of a bent sheet provided herein with heating tubes;

FIG. 18 is a block diagram of yet another embodiment of a cartridge provided herein.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

The application provides a drying device. As shown in fig. 1-2, the drying apparatus includes a feeding portion 100, a hot air system 300, a drying portion 200, a moisture exhausting system 400, a discharging portion 500, and a frame 600. The material enters the drying part 200 through the feeding part 100, and the dried material is output to the next process through the discharging part 500. The hot air system 300 sends the generated hot air into the drying part 200 through the feeding part 100, the hot air contacts with the material to blow out the moist hot air in the material, the material is dried, and the moist hot air (i.e. the moisture exhaust waste gas) is discharged out of the drying device through the moisture exhaust system 400.

The frame 600 is used to support the drying part 200, and is provided with a speed reducer for driving the drying part 200, a lifting mechanism (for jacking up the drying part 200 when the drying device is stopped) of the drying part 200, and an inclination angle adjusting device of the drying part 200. As an embodiment, the frame is formed by butt welding rectangular steel pipes and steel plates. As shown in fig. 1 and 2, the feeding end of the drying part 200 (i.e., the end near the feeding part 100) is higher than the discharging end of the drying part 200 (i.e., the end near the discharging part 500), so as to facilitate the material output.

The feeding portion 100 comprises a horizontal conveying belt and an end face 110 fixed at a first end portion of the conveying belt, a drying portion 200 is arranged at a second end portion of the conveying belt, the end face 110 is perpendicular to the conveying belt, the end face 110 is used for being connected with a discharging portion of a previous process and a hot air system 300, and a feeding port and at least one air inlet are formed in the end face 110. The feed inlet is arranged above the conveying belt and used for conveying materials (such as tobacco flakes) to the conveying belt and further conveying the materials to the drying part 200. The air inlet inputs hot air of the hot air system into the feeding part 100, and then the hot air is conveyed to the drying part 200. The feeding part 100 further comprises a feeding cover wrapping the conveying belt, so that the feeding part forms a closed space to prevent hot air from leaking to the outside. The specific structure of the drying section and hot air system is described below.

The drying section 200 comprises a barrel 210 and a central air duct 220 arranged within the barrel, the central air duct 220 extends in the axial direction of the barrel 210, and the barrel 210 is coaxial with the central air duct 220. A plurality of radial blowing parts are arranged on the central wind barrel 220 along the circumferential direction, and hot air is sprayed out from the blowing parts to dry the materials.

The discharging part 500 comprises a conveying belt and a discharging cover 510 wrapping the conveying belt, and an air outlet is arranged at the top of the discharging cover 510. The material output from the discharge port of the drying section 200 falls to the conveyor belt of the discharge section 500 by the action of gravity, and is output by the conveyor belt in a vibrating manner.

As shown in fig. 8, the moisture exhausting system 400 includes a moisture exhausting cover 410, a moisture exhausting damper 420, a moisture exhausting fan 430, and a moisture exhausting duct 440, which are connected in sequence. The moisture exhausting cover 410 includes a first air inlet, a second air inlet and an air outlet, the first air inlet of the moisture exhausting cover 410 is connected with the air outlet of the discharging cover 510, and the second air inlet is connected with the auxiliary hot air pipe 340, please refer to fig. 3. The hot air in the drying part is contacted with the materials to blow out the moist hot air in the materials, and the moist hot air is discharged through a moisture discharge system. The auxiliary hot air pipe conveys a part of hot air to be mixed with the high-humidity moisture-discharging waste gas, so that the temperature of the moisture-discharging waste gas is increased, and the generation of condensed water is prevented.

Preferably, as shown in fig. 9, a filter screen 450 is rotatably disposed in the moisture exhaust cover, an air inlet direction of a first air inlet of the moisture exhaust cover is consistent with a radial direction of the filter screen 450, moisture exhaust gas enters the moisture exhaust cover through the first air inlet and is then discharged from the moisture exhaust air duct through the rotating filter screen, and the rotating filter screen prevents fine tobacco flakes entrained in the moist hot air from being discharged along with the moisture exhaust gas. Preferably, compressed air is intermittently introduced into the filter screen to prevent the filter screen from being blocked by the fine tobacco flakes.

Compared with the existing drum-type drying equipment, the rotating central air cylinder can fully disperse falling materials along the hot air blown out by radial spraying, and meanwhile, the falling speed of the materials is reduced, so that the hot air is fully contacted with the materials, the uniformity, the stability and the sensory quality of the drying quality of the materials are improved, the moisture uniformity of the materials at an outlet is improved, and the breakage of blades is reduced.

On the basis of the above, as shown in fig. 4-7, preferably, the end surface 110 includes an air inlet cavity 1101 enclosed by the outer side plate and the inner side plate, and the size of the inner side plate is smaller than that of the outer side plate. The air inlet cavity 1101 is communicated with a second air inlet 1107, an air inlet portion 1102 and a first feed inlet are arranged on the outer side plate, and the first feed inlet is arranged below the air inlet portion 1102. The air inlet portion 1102 is a cavity, a first end face of the air inlet portion 1102 is provided with a second air inlet 1107, a second end face is provided with a first air inlet 1103, and the first end face is perpendicular to the second end face. The air inlet duct 1108 passes through the air inlet portion 1102 and the air inlet chamber 1101 in sequence from the first air inlet 1103 and extends from the inner side plate to the drying section 200, and a first air outlet 1105, i.e., a first air inlet at the feeding end of the barrel 210, is formed at the end of the air inlet duct 1108. The inner side plate is provided with a second feed inlet 1109, and a second air outlet 1104 and a third air outlet 1106 which are respectively arranged at the upper side and the lower side of the second feed inlet 1109, the second air outlet 1104 and the third air outlet 1106 are communicated with the air inlet cavity 1101, and the air inlet pipeline 1108 extends out of the second air outlet 1104 and then extends downwards to the central air duct. The first feed inlet and the second feed inlet are opposite in position to form a horizontal feed channel as a feed inlet of the end face. The hot air enters the barrel through the second air outlet 1104 to form a second air inlet at the feed end of the barrel. The hot air enters the barrel through the third air outlet 1106 to form a third air inlet at the feed end of the barrel.

In the preferred embodiment, the hot air system is shown in fig. 3, and the hot air system includes a first hot air subsystem and a second hot air subsystem, the first hot air subsystem includes a first hot air heater 350 and a first hot air duct 320, a first end of the first hot air duct 320 is connected to the first hot air heater 350, and a second end of the first hot air duct 320 is connected to the first air inlet 1103. As an embodiment, the air inlet end of the central air duct 220 is rotatably connected to the air inlet duct 1108 by a hard connection manner such as a bearing, so that the cylinder and the central air duct rotate coaxially and synchronously. As another embodiment, the rotation of the central air duct 220 relative to the air inlet duct 1108 is realized by a flexible connection, so that the cylinder and the central air duct rotate coaxially and synchronously. As another embodiment, the air inlet end of the central air duct 220 is fixedly connected to the air inlet duct 1108. The second hot air subsystem comprises a second hot air heater 310 and a second hot air duct 330, a second end of the second hot air duct 330 is connected with the second hot air heater 310, and a second end of the second hot air duct 330 is connected with a second air inlet 1107.

As an embodiment, the hot wind generated by the first hot wind heater 350 enters the central air duct through the first wind inlet 1103 and the first wind outlet 1105, and the hot wind is blown into the cylinder along the radial direction of the cylinder through the radial blowing part. The hot air generated by the second hot air heater 310 enters the annular space formed by the cylinder and the central air cylinder through the second air inlet 1107, the second air outlet 1104 and the third air outlet 1106 and the space enclosed by the feeding cover, and the hot air is blown in from the upper part and the lower part of the feeding port 1109 along the axial direction of the cylinder. In this embodiment, hot-blast top, below and the center department of barrel of following the material get into the barrel respectively for the area of contact greatly increased of material and hot-blast, improved drying efficiency and drying uniformity.

It can be understood that the first hot air subsystem and the second hot air subsystem can provide hot air with different temperatures, so that the drying of the material is more efficient.

It can be understood that the drying apparatus further includes baffles for the first air outlet, the second air outlet and the third air outlet, respectively, and one or both of the first air outlet, the second air outlet and the third air outlet can be closed as required.

The air intake mode can be selected singly or in combination according to the dewatering amount and the dehumidifying amount. As an example, in the air inlet mode of the single central air cylinder, hot air is subjected to convection drying along the radial direction of the cylinder body through the first air outlet, the hot air and materials can be fully mixed, the drying efficiency is improved, and the air inlet mode is suitable for materials with conventional moisture. As another example, when the moisture content of the incoming material is high, the wind resistance of the central wind cylinder is large, so that the requirement of convection drying cannot be met, and the lower wind inlet mode can be started simultaneously, so that the hot wind quantity of the system is increased.

Still understandably, the drying apparatus may also be provided with air volume adjusting devices for the first air outlet, the second air outlet and the third air outlet, which adjust the air volume, such as a first orifice plate and a second orifice plate which can move relatively. Under different states, the coincidence degree of the holes on the first pore plate and the holes on the second pore plate is different.

Because the wind speed of the hot air in the central air cylinder gradually attenuates from the feeding end to the discharging end, compared with the feeding end, the drying effect of the hot air at the discharging end is poor. In order to solve the technical problem, the present application provides the following embodiments of the central wind tunnel.

As an embodiment, the body of the central wind tunnel 220 is a cylindrical tube, and the aperture ratio of the central wind tunnel gradually increases from the feeding end to the discharging end to compensate for the attenuation of the wind speed.

As another embodiment, the central wind tunnel 220 includes at least two wind tunnel sections, the diameter of the wind tunnel section near the feeding end of the wind tunnel is larger than the diameter of the wind tunnel section near the discharging end of the wind tunnel, the aperture size of each wind tunnel section is consistent, the number of the holes is consistent, and the aperture ratio is preferably 20-40%. This embodiment avoids the not good problem of drying effect that central dryer brought in the excessive decay of discharge end department, and central dryer spun hot-blast distribution is more even, and hot-blast temperature, the amount of wind of each section in the whole barrel remain stable, have improved drying efficiency, have effectively avoided the dry inhomogeneous phenomenon of a section of thick bamboo interior material, and drying effect obtains greatly promoting.

As an example, as shown in fig. 2 and 3, the central air duct 220 includes a first air duct 2201 and a second air duct 2202, and the diameter of the first air duct 2201 is larger than that of the second air duct 2202.

In this example, as an embodiment, the end portions of the first air duct 2201 and the second air duct 2202 are connected through a flange and are communicated with each other, and the first air duct and the second air duct are spliced to form the whole central air duct.

In this example, as a preferred embodiment, the second air duct 2202 is partially nested inside the first air duct 2201. Specifically, a part of the first end (i.e., the end close to the feeding portion) of the second air duct 2202 is inserted into the first air duct 2201, the first end of the first air duct 2201 is detachably connected with the first end of the second air duct 2202, the second end of the second air duct 2202 is closer to the discharging cover than the second end of the first air duct 2201, and the part of the second air duct 2202 inserted into the first air duct has no blowing portion. A plurality of radial support rods are arranged on the inner wall of the first air duct 2201 and the outer wall of the second air duct 2202 and used for supporting two sections of air ducts, and a central air duct formed by the first air duct 2201 and the second air duct 2202 rotates as a whole.

In the two-duct-nested embodiment, as an example, a first air inlet duct and a second air inlet duct are disposed between the first air inlet 1103 and the first air outlet 1105, the diameter of the second air inlet duct is smaller than that of the first air inlet duct, and the second air inlet duct is inserted into the first air inlet duct. The air outlet of the first air inlet pipeline is connected with the first air duct 2201 so as to communicate the first air duct and the first air duct. The air outlet of the second air inlet pipe forms a fourth air inlet of the cylinder, and the fourth air inlet is concentric with the first air inlet of the cylinder and is connected with the second air duct 2202, so that the fourth air inlet and the first air inlet are communicated. In the preferred embodiment, the second end of the second hot air duct is connected to the first air intake duct. The hot air generated by the second hot air heater enters the space between the first air duct and the second air duct through the first air inlet pipeline, and the hot air is blown into the part, close to the feeding part, in the barrel along the radial direction of the barrel. Meanwhile, the hot air system further comprises a third hot air subsystem, the third hot air subsystem comprises a third hot air heater and a third hot air pipe, the first end of the third hot air pipe is connected with the third hot air heater, and the second end of the third hot air pipe is connected with a second air inlet pipeline. The hot air generated by the third hot air heater enters the second air duct through the second air inlet pipeline, and the hot air is blown into the part, close to the discharging part, in the barrel along the radial direction of the barrel.

Preferably, the temperature of the hot air in the third hot air subsystem is different from that of the hot air in the second hot air subsystem, and the material is dried by the hot air with different temperatures at the feeding end and the discharging end of the cylinder, so that the material is dried more efficiently.

In the two air duct nested embodiment, as another example, the hot air generated by the first hot air heater 350 enters the second air duct 2202 through the first air inlet 1103 and the first air outlet 1105, and the hot air is blown into the cylinder portion close to the discharging cover from the radial direction through the second air duct 2202. Hot air generated by the second hot air heater 310 enters an annular space between the first air duct 2201 and the second air duct 2202 through the second air inlet 1107, the second air outlet 1104 and the third air outlet 1106 and a space enclosed by the feeding cover, and the hot air is blown into a cylinder part close to the feeding cover from the radial direction.

The first air duct and the second air duct can blow hot air simultaneously or respectively. According to the drying principle, when wet materials just enter the barrel, the moisture content is large, hot air with high temperature is used for drying the materials at the moment, surface water of the materials is evaporated quickly, therefore, the first air duct adopts the hot air with high temperature for blowing, after the surface water is evaporated, the temperature of the materials starts to be increased, in order to obtain good material quality at low temperature, the low-temperature hot air is used for drying the materials, and therefore, the second air duct adopts the hot air with low temperature for blowing.

As an embodiment, the auxiliary hot air duct may be a branch duct of the first air inlet duct, the second air inlet duct or the third air inlet duct.

As an example, the blowing section 2203 of the blowing section on the center air duct is a columnar blowing tube.

However, since the tubular blowing portion does not provide hot air at a position in the cylindrical body where the blowing portion is not provided, and the hot air is not uniformly distributed in the cylindrical body, it is preferable that, as an example, as shown in fig. 12 and 13, the blowing portion 2203 is a blowing pipe having a rectangular cross section, a blowing slit is formed between two parallel plates, and a plurality of adjusting mechanisms (not shown in fig. 12) for adjusting the slit width are provided on the blowing portion 2203 to adjust the air output of the blowing portion. As one example, the adjustment mechanism is a screw nut assembly. In this embodiment, the central air duct does not rotate, facilitating the adjustment of the width of the slit by the adjustment mechanism 2206. On the basis, due to the existence of gravity, the material falls into the lower part of the barrel in the material stirring process, so that preferably, an axial partition plate is arranged in the central air duct, and the cavity of the central air duct is divided into an upper cavity and a lower cavity by the partition plate. As shown in fig. 13, the partition plate divides the central air duct into an upper cavity and a lower wall with the same size. Preferably, the volume of lower cavity is greater than the volume of upper cavity for the lower part of central dryer exports stronger hot-blast, makes the energy obtain effective utilization.

Preferably, as another embodiment, as shown in fig. 10, the blowing portion 2204 on the central air duct is a strip-shaped hole extending along the axial direction of the central air duct, the strip-shaped hole is in a trapezoidal shape, the small opening end is close to the feeding end of the barrel, and the large opening end is close to the discharging end of the barrel, so as to adjust the opening degree of the hot air and compensate for the attenuation of the wind speed. On the basis, as shown in fig. 11, a plurality of baffles 2205 are uniformly arranged on the outer circumferential surface of the central wind cylinder along the axial direction, and the baffles 2205 can also be arranged progressively, and are used for adjusting the air output.

For the cylinder 210, the following structures of the embodiments may be adopted. The cylinder body of the following embodiments can be matched with any one of the central wind cylinders to achieve the purpose of drying materials.

As an embodiment, a plurality of shoveling plates are uniformly distributed on the cylinder body along the circumferential direction, extend along the axial direction of the cylinder body and are used for assisting materials to perform shoveling movement in the rotation process of the cylinder body, and the materials are thrown under the action of the shoveling plates and then are contacted with hot air to realize drying. In this embodiment, the preferable scheme of the central wind barrel is as follows: a row of blowing parts are arranged at the position of the central wind barrel corresponding to the space between every two shoveling plates, as shown in fig. 12, each row of blowing parts provides hot wind for the materials in the corresponding shoveling plate interval in a targeted manner, so that the materials in the barrel can be dried more uniformly.

FIG. 14 illustrates one embodiment of a slate, which employs a straight slate 2101. For the application scenario of larger particulate materials such as smoked sheets, considering the motion transmission property of the materials in the cylinder, in order to reduce the throwing angle and the spreading angle of the materials during the material-making motion and reduce the fall of the throwing motion, the shoveling plate is preferably a bent shoveling plate 2102, as shown in fig. 15 and 17. The end part of the bending shoveling plate has a certain bending angle relative to the body, and the throwing motion fall of the materials in the cylinder body is effectively reduced.

Preferably, a plurality of heating pipes are uniformly arranged on the inner wall of the cylinder 210, and as shown in fig. 16, the heating pipe 2104 extends along the axial direction of the cylinder. In the preferred embodiment, the drying device further comprises a steam heating system, the steam heating system conveys the generated steam to the heating pipe on the barrel, the heating pipe releases heat, air in the barrel is heated to dry the materials, and condensed water formed after the steam is condensed is discharged through the drainage pipeline. The heating pipe on the inner wall of the cylinder body plays a role in heat preservation of hot air in the cylinder body, and the drying speed of materials can be improved.

On the basis, preferably, a plurality of heating pipes are uniformly distributed on the straight board shoveling plate and the bending type shoveling plate. Taking the bent sheet 2102 shown in fig. 17 as an example, the heating pipe 2103 extends in the longitudinal direction of the bent sheet 2102.

In the preferred embodiment, the principle of the drying apparatus is as follows: the inner wall of barrel and the flitch of copying the material under the effect of steam rise to the assigned temperature, the material is sent into drying equipment in through the conveyer belt, the barrel is at rotatory in-process copying the material board and constantly turns over the stir-fry material, the material constantly carries out the conduction drying with the inner wall contact of barrel, simultaneously, the hot-blast abundant contact of material in the hot-blast and the section of thick bamboo that blows off of central air cylinder carries out the convection drying, moist hot-blast after the drying is discharged the barrel under the row damp fan effect of discharge end, arrange the damp air door in the damp pipeline, carry out corresponding regulation and control through the data of export moisture meter feedback, control program is through changing the moisture discharge volume, hot-blast temperature adjusts slice cigarette export moisture, thereby realize the control to export moisture.

As another example, as shown in FIG. 18, the inner wall of the cylinder 210 is designed to have a wave-shaped structure, so that the material is thrown up and down during the drying process, and is easier to quickly dehydrate and dry.

The beneficial effect of this application is as follows:

1. in this application, central dryer provides radial hot-blast at 360 within ranges, makes whereabouts material homodisperse, reduces material falling speed simultaneously, makes hot-blast and material fully contact, is favorable to improving homogeneity, stability and sense organ quality of material drying quality, promotes the moisture homogeneity of export material and reduces the blade and makes garrulous

2. In this application, hot-blast top, the below of following the material and the center department of barrel get into the barrel respectively for material and hot-blast area of contact greatly increased have improved drying efficiency and drying uniformity.

3. In this application assist the hot-blast pipe to carry some hot-blastly mix with the row's damp waste gas of high humidity, promote row's damp waste gas temperature, prevent the production of comdenstion water.

Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims

1. The drying equipment is characterized by comprising a feeding part, a hot air system and a drying part;

the drying part comprises a barrel and a central air duct arranged in the barrel, the central air duct extends along the axial direction of the barrel, the barrel and the central air duct are coaxial, and the pipe wall of the central air duct is provided with a plurality of radial blowing parts;

the feeding part comprises a conveying belt and an end face fixed at the first end part of the conveying belt, and the barrel and the central air cylinder are rotatably arranged at the second end part of the conveying belt; the end face is provided with a feed inlet and a first air inlet, the feed inlet is arranged above the conveying belt, and the first air inlet is communicated with the central air duct;

the hot air system comprises a first hot air subsystem, the first hot air subsystem comprises a first hot air heater and a first hot air pipe, the first end of the first hot air pipe is connected with the first hot air heater, and the second end of the first hot air pipe is connected with the first air inlet.

2. The drying apparatus of claim 1, further comprising a discharge portion and a moisture removal system;

the discharging part is connected with the drying part and comprises an exhaust port;

the moisture removing system comprises a moisture removing cover, a moisture removing air door, a moisture removing fan and a moisture removing air channel which are sequentially connected, and a first air inlet of the moisture removing cover is connected with an air outlet of the discharging part;

arrange the tide cover internal rotation and be equipped with the filter screen, the direction of admitting air of first air inlet with the radial unanimity of filter screen.

3. The drying apparatus according to claim 2, wherein an auxiliary hot air pipe is disposed on the first hot air pipe, and the auxiliary hot air pipe is connected to the second air inlet of the moisture exhaust hood.

4. The drying apparatus according to claim 1, wherein the hot air system further includes a second hot air subsystem, the second hot air subsystem includes a second hot air heater and a second hot air duct, a first end of the second hot air duct is connected to the second hot air heater, a second end of the second hot air duct is connected to a second air inlet of the end surface, and the second air inlet is communicated with the barrel.

5. The drying equipment according to claim 4, wherein a second air outlet communicated with the second air inlet is arranged on the end face, the second air outlet is arranged above the feeding hole, and the second air outlet is communicated with the barrel.

6. The drying apparatus of claim 5, wherein the end surface includes an air inlet chamber defined by the outer side plate and the inner side plate;

the first air inlet and the second air inlet are formed in the outer side plate, and the second air inlet is communicated with the air inlet cavity;

the second air outlet is arranged on the inner side plate and communicated with the air inlet cavity.

7. The drying device according to claim 6, wherein a third air outlet is further formed in the inner side plate, the third air outlet is arranged below the feed inlet, and the third air outlet is communicated with the cylinder.

8. The drying apparatus as claimed in claim 6, wherein the first air inlet is connected to the central air duct through an air inlet duct, the air inlet duct passes through the air inlet chamber, and an end of the air inlet duct forms a first air outlet.

9. The drying apparatus of claim 7, further comprising baffles for the first outlet, the second outlet, and the third outlet, respectively.

10. The drying apparatus according to claim 7, further comprising air volume adjusting devices for the first air outlet, the second air outlet and the third air outlet, respectively.