[0039] Embodiment 2
[0040] like figure 1 As shown in the figure, an internal flow tobacco dryer described in this embodiment is mainly composed of a cylinder body 2, a feeding end 1, a discharging end 4, a central pipe 5, a branch pipe 7, a moisture removal device 3, and a management and control system. 12. The drive device 11, the heat exchanger 10, the fan 9 and the supporting legs 8 are composed. Wherein, the cylinder 2 is located between the feeding end 1 and the discharging end 4 and rotates under the driving of the driving device 11 , and the central pipe 5 and the branch pipes 7 do not rotate with the cylinder 2 . The rotation of the cylinder body 2 enables the tobacco material at the bottom of the cylinder body 2 to fully contact the drying gas discharged from the branch pipe 7, thereby achieving the purpose of more adequate drying.
[0041] In this embodiment, the central pipe 5 runs through the interior of the cylinder body 2 and includes a first central pipe 51 , a connecting pipe 53 and a second central pipe 52 . The two ends of the connecting pipe 53 are connected to the first central pipe 51 and the second central pipe 51 The central pipe 52 is connected by the flange 6 . Specifically, one end of the first central pipe 51 is fixed on the feed end 1 , and the other end of the first central pipe 51 is fixedly connected to one end of the connecting pipe 53 through the flange 6 . One end of the second central pipe 52 is fixedly mounted on the discharge end 4 , and the other end of the second central pipe 52 is connected to the other end flange 6 of the connecting pipe 53 . Connecting the central pipe 5 into the interior of the cylinder body 2 in sections can not only reduce the difficulty of processing, but also solve the problem that the central pipe 5 is too long and difficult to install into the interior of the cylinder body 2 .
[0042] like figure 2 and image 3 As shown, at least one row of branch pipes 7 is evenly distributed along the respective length directions of the lower parts of the first central pipe 51 and the second central pipe 52 . The drying gas in the first central pipe 51 and the second central pipe 52 is discharged through the branch pipe 7 and acts on the tobacco material at the bottom of the cylinder body 2, so that the tobacco material is dried. In this embodiment, the non-fixed end of the branch pipe 7 is close to the tobacco material at the bottom of the cylinder 2, so that since the drying gas discharged from the branch pipe 7 has a certain distance from the tobacco material, the drying gas can be blown on the tobacco material, Allow the tobacco material to dry sufficiently. Preferably, the non-fixed end of the branch pipe 7 contacts the tobacco material at the bottom of the cylinder 2, that is, the end of the non-fixed end of the branch pipe 7 protrudes into the tobacco material and is in strong contact with the tobacco material, and the drying effect is more obvious.
[0043] In this embodiment, the branch pipes 7 on the first central pipe 51 and the first central pipe 51 form an included angle of 70° to 90°; the branch pipes 7 on the second central pipe 52 and the second central pipe 52 Form an included angle of 70° to 90°. More preferably, the branch pipe 7 on the first central pipe 51 and the first central pipe 51 form an included angle of 87°, and the branch pipe 7 on the second central pipe 52 and the second central pipe 52 form an 87° clamp. horn. In this way, the branch pipe 7 can provide the tobacco material with a force in the direction of the discharge end 4 , thereby facilitating the smoother flow of the tobacco in the cylinder body 2 .
[0044] like Figure 4 to Figure 6 As shown, the end of the branch pipe 7 close to or contacting the tobacco material is provided with a drying gas nozzle, and the diameter of the drying gas nozzle is not larger than the pipe diameter of the branch pipe 7; the shape of the drying gas nozzle is a duckbill or Conical or cylindrical. Setting the non-fixed end of the branch pipe 7 into a duckbill shape, a conical shape or a cylindrical shape can ensure that the drying gas is sprayed in a designated direction, and can also increase the spraying speed of the drying gas.
[0045] In this embodiment, the cylinder body 2 is inclined in the direction of the discharge end 4, and the axis line of the cylinder body 2 forms an included angle between 0° and 10° with the horizontal line. The inclined setting of the cylinder body 2 is conducive to the movement of the tobacco to the discharge end 4; the tobacco is always at the bottom of the cylinder body 2 in the process of moving from the feed end 1 to the discharge end 4, thereby forming a stable material layer and reducing the amount of material. Fly Yang. The moisture removal device 3 is arranged in the middle of the cylinder body 2, and is used to discharge the dried moist gas out of the cylinder body 2, so as to better improve the whole drying process.
[0046] In the present embodiment, the working engineering of the tobacco dryer is as follows:
[0047] When the tobacco material needs to be dried, the dryer is started, the cylinder 2 starts to rotate, and the central pipe 5 and the branch pipes 7 do not rotate with the cylinder 2 . The management and control system 12 controls the fan 9 and the heat exchanger 10 to work, and exchanges heat with the air to obtain dry gas (eg, hot air or superheated steam). The blower 9 transports the drying gas to the discharge end 4 , and the drying gas enters the central pipe 5 from the drying gas inlet of the discharge end 4 . When the temperature in the central pipe 5 reaches the preset temperature, the control system 12 controls the tobacco material to enter the inside of the cylinder 2 from the feeding end 1. The tobacco material is always at the bottom of the cylinder 2 due to its own gravity, and because the cylinder 2 rotates , the tobacco material is tumbling and stirring as the cylinder 2 rotates. A part of the drying gas is discharged through the branch pipe 7 near the discharge end 4 , and the remaining drying gas continues to flow toward the feed end 1 . The drying gas flow is opposite to the flow direction of the tobacco material, and the drying gas velocity discharged from the branch pipe 7 near the feed end 1 is the highest. The drying gas discharged from the branch pipe 7 is in full contact with the tobacco material at the bottom of the cylinder body 2. During the drying process of the tobacco material, a series of chemical reactions occur. As the drying time increases, the moisture in the tobacco material is gradually evaporated. The outgoing moisture with miscellaneous gas is discharged from the cylinder 2 through the moisture exhaust device 3 . In this way, after the tobacco material at the bottom of the cylinder body 2 is dried, it is discharged from the discharge end 4 to achieve the purpose of sufficient drying.
[0048] Compared with the traditional drum dryer, the invention dries the leaves, cut leaves, tobacco stems and cut stems in the tobacco silk production line. Compared with the traditional drum dryer, the processing strength is reduced, the drying speed is fast, the drying time is short, and the shredding is low, and the production capacity is the same. The volume of the lower equipment is greatly reduced, the filling value of the cut tobacco is improved, and the moisture content and moisture accuracy required by the process indicators are achieved.
