CN110006231B

CN110006231B - Drum-type dryer

Info

Publication number: CN110006231B
Application number: CN201910389894.0A
Authority: CN
Inventors: 朱明宽
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2024-01-26
Anticipated expiration: 2039-05-10
Also published as: CN110006231A

Abstract

The embodiment of the invention discloses a roller dryer, which relates to the technical field of drying equipment and comprises a frame, a shell, a heating roller, a drying roller and a power device, wherein wheels are arranged at the bottom of the frame, a traction frame is arranged at the front end of the frame, the shell is fixed on the upper side of the frame, a feed inlet, a discharge outlet and an exhaust outlet are arranged on the shell, a combustion chamber and a heat exchange chamber are arranged on the inner side of the front part of the shell, a plurality of heat exchange pipes are arranged above the combustion chamber, the heating roller is arranged on the inner side of the front part of the shell, the drying roller is arranged on the inner side of the rear part of the shell, the power device is arranged in the shell and in transmission connection with the drying roller, a main flue is arranged at the rotation center of the drying roller, the front end of the main flue is communicated with the combustion chamber, and the rear end of the main flue is positioned on the outer side of the rear end of the shell. The roller dryer provided by the embodiment of the invention has the advantages of high heat utilization rate, wide available fuel, unrestricted material drying and good mobility.

Description

Drum-type dryer

Technical Field

The embodiment of the invention relates to the technical field of drying equipment, in particular to a roller dryer.

Background

It is known that mildew can occur when the temperature and humidity conditions in the environment of the grain meet the growth and propagation of microorganisms. That is, moisture and temperature are two important factors for the propagation of microorganisms such as mold in grains (i.e., mold in grains). Controlling grain moisture below safe moisture generally prevents grain mildew. At present, the method for reducing the moisture of grains is an auto-ignition airing method. In a grain main production area, due to large yield and insufficient airing sites, grains purchased in a grain depot often have moisture exceeding safe moisture, which is a main factor causing the grains in the grain depot to mildew, especially in the grain purchasing period, in the next overcast day; in addition, even if the moisture of the grains in the warehouse does not exceed the safe moisture, the grains in the warehouse need to be dried periodically due to spontaneous combustion and moisture regain, so that the grains are not mildewed, and the grains in the warehouse often cannot be dried on time due to the limitation of the drying place of the grain warehouse, so that the grains in the grain warehouse are mildewed.

The existing equipment for drying grains is a vertical drying tower, so that most grains can be effectively dried, but the following defects exist: the boiler and the tower body (containing a hearth) are separated, and the waste heat of the chimney cannot be utilized, so that the heat utilization rate is low; the boiler takes coal as a single fuel, so that the energy consumption is high on one hand, and the use of other fuels is limited on the other hand; only grains with better fluidity can be dried, grains with poor fluidity cannot be or are inconvenient to use; moisture or humidity in the tower moves upwards, and damp grains (damp grains) move downwards from top to bottom, so that the temperature of the damp grains in the furnace is slowly increased due to the fact that the moisture is condensed on the surfaces of the damp grains, and the condensed moisture can repeatedly absorb heat in the furnace, so that energy consumption is increased; the movement is inconvenient, and individual farmers are inconvenient to use; in addition, the large vertical drying tower has more manpower and material resources, and is generally only equipped in a grain processing plant or a purchasing station; the hot hearth is slow in winter, the furnace starting preheating time is long, and the energy consumption is greatly increased in winter (especially in north).

Disclosure of Invention

Therefore, the embodiment of the invention provides a roller dryer which aims to solve the problems of low heat utilization rate, limited fuel, limited grain which can be dried, repeated energy consumption of moisture in a furnace, poor mobility and the like of the conventional drying tower.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

according to a first aspect of an embodiment of the present invention, a tumble dryer comprises;

the device comprises a shell, wherein a feed inlet is formed in the outer side of the front end of the shell, a discharge outlet is formed in the outer side of the rear end of the shell, a combustion chamber is formed in the inner side of the front part of the shell, heat exchange chambers are formed in the left side and the right side of the combustion chamber, a plurality of heat exchange pipes are arranged above the combustion chamber, and the front ends of the heat exchange pipes are communicated with the heat exchange chambers;

the heating roller is arranged on the inner side of the front part of the shell, the heating roller is positioned above the combustion chamber, the front end of the heating roller is communicated with the bottom end of the feeding hole, and the heat exchange tubes are uniformly distributed along the circumferential direction of the heating roller;

the drying roller is arranged on the inner side of the rear part of the shell, the front end of the drying roller is fixed and communicated with the rear end of the heating roller, the rear end of the drying roller is communicated with the discharge hole, and the rear ends of the heat exchange tubes are positioned at the front end of the drying roller;

the front end of the heating roller is rotationally connected with the front end of the machine shell, the rear end of the drying roller is rotationally connected with the rear end of the machine shell, and the heating roller and the drying roller can synchronously rotate;

the power device is arranged in the shell and is in transmission connection with the drying roller, and the power device is used for driving the drying roller to rotate;

the main flue is arranged at the rotating center of the drying roller, the front end of the main flue is communicated with the combustion chamber, and the rear end of the main flue is positioned at the outer side of the rear end of the machine shell, wherein the main flue synchronously rotates along with the drying roller.

Further, the drum dryer further comprises a frame provided with wheels, and the frame is arranged at the bottom of the shell.

Further, a traction frame for connecting with a traction vehicle is arranged at the front end of the frame.

Further, an adjusting member for adjusting the pitch angle of the frame is provided at a side portion of the front end of the frame.

Further, an exhaust port for exhausting steam is provided at the top of the rear portion of the casing.

Further, the front end of the main flue is provided with a plurality of sub-flues which are vertical to and communicated with the main flue, and the sub-flues are uniformly distributed along the circumferential direction of the main flue.

Further, a plurality of shoveling plates for stirring materials are arranged in the heating roller and the drying roller.

Further, the drum-type dryer further comprises two air inlet machines, the two air inlet machines are respectively fixed on the left side and the right side of the shell, and the blowing openings of the two air inlet machines are respectively positioned in the two heat exchange chambers on the left side and the right side.

Further, the drying roller is a cylindrical frame structure, and screens are detachably arranged at the front end, the rear end and the circumferential side of the frame structure.

Further, an auger for discharging crushed grains is arranged at the bottom of the shell, the auger is in transmission connection with the power device, and the auger is located at the lower side of the drying roller.

The embodiment of the invention has the following advantages:

the use of the drum dryer that this embodiment provided, power device drives heating cylinder, drying cylinder rotates, the material enters into heating cylinder-drying cylinder from the feed inlet, fuel produces heat at the combustion chamber burning, heating cylinder absorbs the heat heating material in the combustion chamber, the heat transfer room, the heat exchange tube absorbs the heat in the combustion chamber and blows in the drying cylinder with hot air, carry out hot-blast stoving to the material in the drying cylinder, the high temperature flue gas that the combustion chamber produced, outside the casing is discharged after drying cylinder from the main flue, because the whole temperature that is located drying cylinder of main flue is less than the temperature of high temperature flue gas in addition, the main flue is with the heat transfer of high temperature flue gas to drying cylinder in, utilize the flue gas waste heat, the heat utilization is improved.

In addition, the frame, the tires and the traction frame improve the mobility; the exhaust port avoids condensation in the drying roller when encountering cold and repeatedly absorbs heat in the drying roller, thereby improving the heat utilization rate; more materials can be dried by selecting and replacing screens with different meshes, and the grain which can be dried is not limited any more; the fuel can be selected from coal, straw or branches, and the like, so that the field combustible material sources can be fully utilized, and the cost is saved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the ambit of the technical disclosure.

Fig. 1 is a schematic view showing a drum dryer according to embodiments 1, 3, 4 and 6 of the present invention;

fig. 2 is a schematic structural view of a drum dryer according to embodiments 1, 3, 4 and 5 of the present invention (omitting a casing and a combustion chamber, etc.);

fig. 3 is a schematic diagram of the positional relationship among the combustion chamber, the heat exchange chamber, and the heat exchange tube of the drum dryer according to embodiment 1 of the present invention;

fig. 4 is a schematic cross-sectional view (cross-sectional line omitted) of a combustion chamber of a drum dryer according to embodiments 1 and 2 of the present invention;

fig. 5 is a schematic cross-sectional view (cross-sectional line omitted) of a drying drum of a drum dryer according to embodiments 2 and 3 of the present invention.

In the figure: 1-a frame, 11-wheels, 12-a traction frame, 13-an adjusting part and 14-a pointer meter;

2-shell, 21-feed inlet, 22-discharge outlet, 23-exhaust outlet, 24-combustion chamber, 25-heat exchange chamber, 26-heat exchange tube, 27-deflector, 28-air inlet machine, 29-main flue, 210-branch flue, 211-heat preservation layer, 212-auger, 213-crushed grain discharge outlet, 214-smoke tube, 215-induced draft fan;

3-heating roller and 31-shoveling plate;

4-a drying roller, 41-a screen, 42-a screen bracket and 43-a rolling ring;

5-power device, 51-motor, 52-belt pulley, 53-speed reducer, 54-transmission shaft, 55-transmission wheel.

Detailed Description

Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The terms such as "upper", "lower", "left", "right", "middle" and the like are also used in the present specification for convenience of description, but are not intended to limit the scope of the present invention, and the changes or modifications of the relative relationship thereof are considered to be within the scope of the present invention without substantial modification of the technical content.

Example 1

As shown in fig. 1 to 4, embodiment 1 provides a drum dryer for farmers to dry grains, bean curd refuse, distillers grains, etc., which can be used in field sites or farmers' homes, and also can be used in processing plants.

The roller dryer provided by the embodiment comprises a frame 1, a machine shell 2, a heating roller 3, a drying roller 4 and a power device 5.

Wheels 11 are arranged at the bottom of the frame 1, and two wheels 11 are arranged and are respectively positioned at the left side and the right side of the frame 1. A traction frame 12 for connecting with a tractor is arranged at the front end of the frame 1, and the traction frame 12 is fixed with the frame 1. The drum dryer of the embodiment can be moved to places such as a field land, a farmer home or a processing factory building through traction of a tractor, such as a tractor, an agricultural tricycle or an agricultural truck, and the like, and is convenient to move, and compared with the existing vertical drying tower, convenience is improved.

The housing 2 is fixed to the upper side of the frame 1. A feed inlet 21 is fixed on the outer side of the front end of the machine shell 2, a discharge outlet 22 is fixed on the outer side of the rear end of the machine shell 2, and an exhaust outlet 23 for exhausting steam is arranged on the top of the rear part of the machine shell 2. A combustion chamber 24 is arranged on the inner side of the front part of the shell 2, a grate is arranged at the bottom of the combustion chamber 24, and the combustion chamber 24 is a place where fuel burns. The combustion chamber 24 can use coal, straw (when used in the field), branches and the like as fuel, and compared with the existing vertical drying tower, the fuel is more widely used, and the field combustible material sources can be fully utilized, so that the cost is saved. Heat exchange chambers 25 are provided on the left and right sides of the combustion chamber 24, and the heat exchange chambers 25 are configured to absorb heat generated by combustion of the fuel in the combustion chamber 24 and to heat air in the heat exchange chambers 25. A plurality of heat exchange tubes 26 are provided above the combustion chamber 24, and the plurality of heat exchange tubes 26 are uniformly distributed along the circumferential direction of the heating drum 3. An arc-shaped guide plate 27 is arranged between the lower part of the heating roller 3 and the heat exchange tube 26, and the guide plate 27 can split the heat of the combustion chamber 24 to two sides so that a plurality of heat exchange tubes 26 can absorb the heat and the fuel utilization rate is improved. The front ends of the heat exchange pipes 26 are communicated with the heat exchange chamber 25, and the rear ends of the heat exchange pipes 26 are positioned at the front end of the drying roller 4. One air inlet fan 28 is fixed outside the left and right sides of the casing 2, and the air outlets of the two air inlet fans 28 are respectively positioned in the two heat exchange chambers 25 on the left and right sides. The air inlet fan 28 blows air to the heat exchange chamber 25, hot air in the heat exchange chamber 25 is blown into the heat exchange tube 26, the heat exchange tube 26 continuously absorbs heat generated by fuel combustion and heat air in the heat exchange tube 26, and the heated air is finally blown into the drying roller 4 from the other end of the heat exchange tube 26.

The heating drum 3 is cylindrical, is disposed inside the front of the cabinet 2, and is located above the combustion chamber 24. The front end of the heating roller 3 is communicated with the bottom end of the feed inlet 21, and the front end of the heating roller 3 is rotationally connected with the front end of the machine shell 2. The rear end of the heating drum 3 communicates with the front end of the drying drum 4.

The drying drum 4 has a cylindrical frame structure and is disposed inside the rear portion of the cabinet 2. The front end of the drying roller 4 is communicated with the rear end of the heating roller 3, the rear end of the drying roller 4 is fixedly communicated with the discharge hole 22, and the rear end of the drying roller 4 is rotationally connected with the rear end of the machine shell 2. Wherein, the heating roller 3 and the drying roller 4 can synchronously rotate in the machine shell 2. In the present embodiment, the drying drum 4 includes a screen bracket 42 constituting a cylindrical frame structure and screens 41 provided at the front and rear ends and the circumferential sides of the frame structure. Wherein the screen 41 is detachably fixed to the screen holder 42. Different materials can be dried by replacing the screens 41 with meshes of different sizes, such as corn drying by using the screens 41 with larger meshes, bean curd residue drying by using the screens 41 with smaller meshes, vinasse drying by using the screens 41 with smaller meshes, and the like, thereby solving the problem of limited grain drying by the existing vertical drying tower. An annular rolling ring 43 is provided on the circumference of the drying drum 4, and the rolling ring 43 is welded to the screen holder 42.

The power device 5 is arranged in the shell 2, the power device 5 is in transmission connection with the heating roller 3 and the drying roller 4, and the power device 5 is used for driving the heating roller 3 and the drying roller 4 to rotate.

Wherein, set up the main flue 29 in the rotation center of stoving cylinder 4, the front end and the combustion chamber 24 intercommunication of main flue 29, the rear end of main flue 29 is located the casing 2 rear end outside, and wherein, main flue 29 rotates along with stoving cylinder 4 is synchronous. The front end of the main flue 29 is provided with a plurality of sub-flues 210 which are perpendicular to and communicated with the main flue 29, and the plurality of sub-flues 210 are uniformly distributed along the circumferential direction of the main flue 29. The flue gas generated in the combustion chamber 24 is collected into the main flue 29 from the branch flue 210 and discharged from the rear end of the main flue 29. Wherein, main flue 29 passes through stoving cylinder 4, and main flue 29 releases the waste heat of flue gas to the stoving cylinder 4 that the temperature is lower relatively in, through the waste heat that utilizes the flue gas, improves the stoving cylinder 4 drying efficiency to improve the utilization ratio of fuel.

By using the roller dryer provided by the embodiment, the power device 5 drives the heating roller 3 and the drying roller 4 to rotate, materials (to-be-dried materials such as bean curd residues, coconut shells, vinasse, pumpkin, sunflower, peanuts, melon seeds and other grains) enter the heating roller 3-drying roller 4 from the feed inlet 21, fuel is combusted in the combustion chamber 24 to generate heat, the heating roller 3 absorbs the heat in the combustion chamber 24 to heat the materials, the heat exchange chamber 25 and the heat exchange tube 26 absorb the heat in the combustion chamber 24 and blow hot air into the drying roller 4 under the action of the air inlet machine 28, the materials in the drying roller 4 are dried by hot air, the hot air or the hot air is discharged from the exhaust outlet 23 after passing through the materials in the drying roller 4, so that the hot and humid water vapor is prevented from repeatedly absorbing the heat in the drying roller 4 due to condensation, compared with the conventional vertical drying tower, the repeated energy consumption condition in the furnace of the vertical drying tower is avoided, and the heat utilization rate is improved; the high-temperature flue gas generated by the combustion chamber 24 enters the main flue 29 from the branch flue 210 and is discharged out of the machine shell 2, and because the whole main flue 29 is positioned in the drying roller 4, the temperature of the drying roller 4 is generally lower than that of the high-temperature flue gas, the main flue 29 transfers the heat of the high-temperature flue gas into the drying roller 4, and the heat utilization rate is improved by utilizing the waste heat of the flue gas.

In addition, the roller dryer provided by the embodiment has good mobility, so that the roller dryer can be used for drying grains for farmers in the field or at home, the dried grains can be stored for selling good price in future, the loss of the grains is reduced, the income of the farmers is increased, and the price of monopoly tide grains of a large vertical drying tower is avoided.

In this embodiment, an insulation layer 211 is further disposed on the outer side of the housing 2, the insulation layer 211 may be made of asbestos, and the insulation layer 211 is fixed on the housing 2 by screws. Through the heat preservation layer 211, the heat loss in the machine shell 2 is reduced, the energy consumption is reduced, the heat utilization rate and the fuel utilization rate are improved, and the energy can be effectively saved by 30-50% in winter with cold weather in the north.

Example 2

As shown in fig. 4 and 5, embodiment 2 provides a drum dryer having substantially the same structure as that of embodiment 1, except that a plurality of shoveling plates 31 for stirring materials are provided in each of the heating drum 3 and the drying drum 4. In the heating drum 3, a plurality of shoveling plates 31 are fixed on the inner wall of the heating drum 3 and uniformly distributed in steps, and a plurality of shoveling plates 31 are fixed on the inner side of a screen bracket 42 of the drying drum 4 and uniformly distributed. The materials in the roller can be continuously turned over by the shoveling plate 31 to be heated uniformly, so that the problem that the local temperature is too high to cause scorching or the local temperature is too low to cause insufficient drying is avoided.

Example 3

As shown in fig. 1, 2 and 5, embodiment 3 provides a drum dryer having substantially the same structure as that of embodiment 1, except that a packing auger 212 for discharging crushed grains is provided at the bottom of the cabinet 2, the packing auger 212 is located at the lower side of the drying drum 4, both ends of the packing auger 212 are fixed to the frame 1 or the cabinet 2 through shaft seats, the packing auger 212 is in transmission connection with the power unit 5, a crushed grain discharge outlet 213 is provided at the rear end of the packing auger 212 and at the bottom of the cabinet 2, and the crushed grain discharge outlet 213 is located at the lower side of the discharge outlet 22, and is not communicated with the two. When in use, the crushed grains fall to the bottom of the shell 2 from the meshes of the screen 41, and the power device 5 drives the auger 212 to rotate, so that the crushed grains in the shell 2 are discharged from the crushed grain discharge outlet 213.

In the preferred scheme of this embodiment, auger 212 sets up two, and two auger 212 parallel arrangement are in the both sides of drying roller 4 bottom, can improve the discharge efficiency of garrulous grain, avoid leading to drying roller 4 stall because of garrulous grain extrusion.

Example 4

As shown in fig. 1 and 2, embodiment 4 provides a drum dryer having substantially the same structure as that of embodiment 1, except that an adjusting member 13 for adjusting the pitch angle of the frame 1 is provided at a side portion of the front end of the frame 1, i.e., the front end of the frame 1 can be raised or lowered by the adjusting member 13, thereby varying the pitch angle of the frame 1. According to the moist condition of material, adjust the pitch angle of frame 1 to adjust the every single move angle of heating cylinder 3 and stoving cylinder 4, adjustable material's moving speed in two cylinders, thereby adjust the time of material in the cylinder, in order to reach better stoving effect, namely: for the materials with higher humidity, the frame 1 and the roller keep a state of low front and high rear, so that the drying time of the materials in the roller is longer; for the material with smaller humidity, the frame 1 and the roller keep the front high and the rear low, so that the drying time of the material in the roller is short, and thus, the material with any humidity can be dried at one time, and the existing three-dimensional drying tower needs to be dried twice when drying the material with larger humidity, and the roller dryer of the embodiment only needs to be dried once.

The two adjusting parts 13 may be arranged one or two, when two adjusting parts 13 are arranged, the two adjusting parts 13 are respectively arranged at the left side and the right side of the frame 1, and the two adjusting parts 13 are symmetrically arranged relative to the frame 1.

In this embodiment, the adjusting component 13 includes a fixed block, a screw, a rocking handle and a cushion block, the fixed block is fixed on the frame 1, a longitudinal threaded hole is provided on the fixed block, the screw is screwed into the threaded hole, the rocking handle is connected with the top of the screw, and the cushion block is pivoted with the bottom of the screw. The screw rod is rotated in the threaded hole through the rocking handle, so that the screw rod is moved upwards or downwards, the front end of the frame 1 is adjusted to be lifted or lowered, the bearing area of the cushion block can be increased, the pressure is reduced, and the ground is prevented from being collapsed.

In this embodiment, a pointer table 14 is further disposed on the outer side of the casing 2, the pointer table 14 is located on the upper side of the tire, and the pitch angle of the frame 1 can be clearly known through the pointer table 14.

Example 5

As shown in fig. 2, embodiment 5 provides a drum dryer having substantially the same structure as that of embodiment 1, except that in the present embodiment, two rolling rings 43 are provided, and the two rolling rings 43 are disposed at intervals in the front-rear direction.

In the present embodiment, the power unit 5 includes a motor 51, a pulley 52, a speed reducer 53, a transmission shaft 54, and a rotating wheel. The motor 51 is fixed on the frame 1 or the shell 2 and is connected with a belt pulley 52 in a belt transmission way, and the motor 51 can be a motor with 7.5kw power. Pulley 52 is fixed to the input shaft end of reducer 53. The speed reducer 53 is fixed on the frame 1 or the shell 2, and the output shaft end of the speed reducer 53 is in transmission connection with the transmission shaft 54. The two ends of the transmission shaft 54 are fixed to the frame 1 or the housing 2 through bearing blocks. A rotating wheel is sleeved at the position of the transmission shaft 54, which is positioned on the rolling ring 43, and the rotating wheel synchronously rotates along with the transmission shaft 54 and drives the rolling ring 43 to rotate, thereby driving the heating roller 3 and the drying roller 4 to rotate.

In this embodiment, two transmission shafts 54 are provided, and the two transmission shafts 54 are synchronously driven, or are connected by belt drive, or are connected by chain drive. Two transmission shafts 54 are respectively positioned at the left and right sides of the lower part of the drying drum 4. Each transmission shaft 54 is provided with two transmission wheels 55, and the two transmission wheels 55 are arranged corresponding to the two rolling rings 43. In this way, the four driving wheels 55 on the two driving shafts 54 drive the two rolling rings 43 of the drying drum 4, and the driving wheels can support the weight of the drying drum 4, so that the drying drum 4 rotates more stably.

Example 6

As shown in fig. 1, embodiment 6 provides a drum dryer, which has a structure substantially the same as that of embodiment 1, except that a vertical smoke tube 214 is further provided at the rear side of the casing 2, the lower end of the smoke tube 214 is connected with the rear end of the main flue 29, and an induced draft fan 215 for assisting in smoke discharging is further provided in the smoke tube 214, and the smoke of the combustion chamber 24 can be pumped out of the casing 2 through the branch flue 210-the main flue 29 by the induced draft fan 215, so that the fuel can be fully combusted in the combustion chamber 24. The induced draft fan 215 corresponds to an exhaust fan, and the installation of the induced draft fan 215 is the prior art and is not described herein.

While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.

Claims

1. A tumble dryer, characterized in that it comprises;

the device comprises a shell (2), wherein a feed inlet (21) is formed in the outer side of the front end of the shell (2), a discharge outlet (22) is formed in the outer side of the rear end of the shell (2), a combustion chamber (24) is formed in the inner side of the front part of the shell (2), heat exchange chambers (25) are formed in the left side and the right side of the combustion chamber (24), a plurality of heat exchange pipes (26) are arranged above the combustion chamber (24), and the front ends of the heat exchange pipes (26) are communicated with the heat exchange chambers (25);

the heating roller (3), the heating roller (3) is arranged on the inner side of the front part of the shell (2), the heating roller (3) is positioned above the combustion chamber (24), the front end of the heating roller (3) is communicated with the bottom end of the feeding hole (21), the heat exchange pipes (26) are uniformly distributed along the circumferential direction of the heating roller (3), and an arc-shaped guide plate (27) is arranged between the lower part of the heating roller (3) and the heat exchange pipes (26);

the drying roller (4) is arranged on the inner side of the rear part of the shell (2), the front end of the drying roller (4) is fixed and communicated with the rear end of the heating roller (3), the rear end of the drying roller (4) is communicated with the discharge port (22), and the rear ends of the heat exchange tubes (26) are all positioned at the front end of the drying roller (4);

the front end of the heating roller (3) is rotationally connected with the front end of the machine shell (2), the rear end of the drying roller (4) is rotationally connected with the rear end of the machine shell (2), and the heating roller (3) and the drying roller (4) can synchronously rotate; an air inlet machine (28) is fixed outside the left side and the right side of the shell (2), air blowing openings of the two air inlet machines (28) are respectively positioned in two heat exchange chambers (25) on the left side and the right side, air is blown into the heat exchange chambers (25) through the air inlet machines (28), hot air in the heat exchange chambers (25) is blown into the heat exchange tubes (26), the heat exchange tubes (26) absorb heat generated by fuel combustion and heat air in the heat exchange tubes (26), and the heated air is blown into the drying roller (4) from the other ends of the heat exchange tubes (26);

the power device (5) is arranged in the shell (2), the power device (5) is in transmission connection with the drying roller (4), and the power device (5) is used for driving the drying roller (4) to rotate;

the main flue (29), main flue (29) set up in the rotation center of stoving cylinder (4), the front end of main flue (29) with combustion chamber (24) intercommunication, the rear end of main flue (29) is located casing (2) rear end outside, and in main flue (29) released stoving cylinder (4) with the waste heat of flue gas, wherein, main flue (29) are along with stoving cylinder (4) synchronous rotation.

2. A tumble dryer according to claim 1 characterised in that it further comprises a frame (1) provided with wheels (11), said frame (1) being arranged at the bottom of said casing (2).

3. A tumble dryer according to claim 2 characterised in that a traction frame (12) for connection to a tractor is provided at the front end of said carriage (1).

4. A drum dryer according to claim 2, characterized in that an adjusting member (13) for adjusting the pitch angle of the frame (1) is provided at the side of the front end of the frame (1).

5. A tumble dryer according to claim 1 characterised in that on top of the rear part of said cabinet (2) there is provided an exhaust opening (23) for the exhaust of the vapour.

6. The drum dryer according to claim 1, characterized in that a plurality of sub-flues (210) perpendicular to and communicating with the main flue (29) are provided at the front end of the main flue (29), and the plurality of sub-flues (210) are uniformly distributed along the circumferential direction of the main flue (29).

7. Drum dryer according to claim 1, characterized in that a number of shoveling plates (31) for stirring the material are provided in both the heating drum (3) and the drying drum (4).

8. Drum dryer according to claim 1, characterized in that the drying drum (4) is a cylindrical frame structure, and that screens (41) are detachably provided at the front and rear ends and the circumferential side of the frame structure.

9. Drum dryer according to claim 1, characterized in that a screw conveyor (212) for discharging crushed grains is provided at the bottom of the housing (2), said screw conveyor (212) being in transmission connection with the power means (5), said screw conveyor (212) being located at the underside of the drying drum (4).