CN213756620U - A drying device for mushroom production - Google Patents

Abstract

The utility model relates to a drying device for mushroom production, including the base that sets gradually, a stoving section of thick bamboo and air heater, it is equipped with the carousel that has the stand to rotate on the base, stand top both sides are equipped with two horizontal extension boards, be equipped with the hydro-cylinder on the horizontal extension board, the hydro-cylinder piston rod has been down and linked firmly first motor, the output of first motor has been down and linked firmly the pivot, it has the feed cylinder to rotate the cover in the pivot and have been linked firmly the cover and its bottom, around being equipped with multiunit electric heating pipe on the inside lateral wall of a stoving section of thick bamboo, bottom one end intercommunication has the air-supply line, be equipped with the fan that admits air in the air-supply line top, the bottom is equipped with first solenoid valve, the air heater air outlet is through the air-supply line intercommunication that has the second solenoid valve at the air-supply line middle part, stoving section of thick bamboo one side upper portion has the air exhauster through the exhaust pipe intercommunication, be equipped with temperature sensor on the inner wall, be equipped with the controller on the outer wall. The utility model discloses a two kinds of heat sources heat stoving jointly, and the revolution of cooperation feed cylinder and the rotation of puddler group can improve drying efficiency and oven-dry mass greatly.

Description

A drying device for mushroom production

Technical Field

The utility model belongs to the technical field of the mushroom production, concretely relates to a drying device for mushroom production.

Background

The shiitake has the advantages of fleshy and tender meat, delicious taste, unique aroma and rich nutrition, is a food with food and medicine homology, and has high nutritional, medicinal and health-care values. The mushroom is used as main raw material, and can be produced into various edible products, and the production process of the mushroom comprises the working procedures of cleaning, drying, slicing or dicing the mushroom and the like.

When the mushrooms are dried, the mushrooms are generally heated and dried through a heat source in the conventional mushroom drying process, the drying force is small, the drying efficiency of the mushrooms is influenced, the drying temperature is not easy to regulate and control, the temperature is suddenly high and suddenly low, the colors of the mushrooms are blackened, and the quality of the mushrooms is greatly reduced. In addition, current mushroom drying device is when drying to the mushroom, and the mushroom is piled up together easily, causes the mushroom to dry unevenly, and it is abundant thoroughly inadequately to dry, is unfavorable for the subsequent production and processing of mushroom, awaits improvement.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a drying device for mushroom production adopts two kinds of heat sources to heat jointly and dries, and the revolution of cooperation feed cylinder and the rotation of puddler group can improve drying efficiency and oven-dry mass greatly to solve above-mentioned problem.

In order to achieve the above object, the utility model adopts the following technical scheme: the drying device for mushroom production comprises a base, a drying barrel and an air heater which are sequentially arranged, wherein a rotary table is arranged on the base in a rotating mode, a stand column is fixedly arranged on the rotary table, two transverse supporting plates are symmetrically and fixedly arranged on two sides of the top of the stand column, an oil cylinder is vertically erected at one end, far away from the stand column, of each transverse supporting plate, a piston rod of the oil cylinder faces downwards and is fixedly connected with a first motor, an output end of the first motor faces downwards and is fixedly connected with a rotary shaft, a barrel cover is arranged on the rotary shaft in a rotating mode, a charging barrel is fixedly connected to the bottom end of the rotary shaft, a material door is arranged on an opening of the side wall of the charging barrel in a hinged mode, a plurality of through holes are formed in the barrel wall and the material door of the charging barrel, a stirring assembly is arranged in the charging barrel in a rotating mode, the rotating direction of the stirring assembly is opposite to the rotating direction of the rotary shaft, the top of the drying barrel is opened and is detachably connected with the barrel cover, and a plurality of groups of electric heating pipes are wound on the inner side wall of the drying barrel, Bottom one end intercommunication has the air-supply line, be equipped with air inlet fan, bottom in the vertical setting of air-supply line and its top and be equipped with first solenoid valve, the air heater air outlet is through the hot-blast main intercommunication that has the second solenoid valve at the air-supply line middle part, one side upper portion intercommunication that the air-supply line was kept away from to the drying cylinder has the exhaust pipe, exhaust pipe tail end intercommunication has the air exhauster, be equipped with temperature sensor on the drying cylinder inner wall, be equipped with the controller on the outer wall, temperature sensor, electric heating pipe, air heater, first solenoid valve and second solenoid valve all are connected with the controller electricity.

Preferably, a second motor is arranged in the base, and an output shaft of the second motor extends upwards out of the base and is fixedly connected with the center of the turntable.

Preferably, the stirring subassembly includes vertical and rotates the (mixing) shaft of locating in the feed cylinder, the (mixing) shaft bottom is stretched out the feed cylinder and is connected with the third motor in the transmission, it has a plurality of groups stirring rake to be the interval equipartition from top to bottom on the (mixing) shaft, and every group stirring rake is radially located on the (mixing) shaft and is the puddler of circumference interval equipartition by a plurality of and forms.

Preferably, the opening at the top of the drying cylinder is in an inverted cone shape, and a plurality of internal thread blind holes are circumferentially arranged at intervals at the opening.

Preferably, the open looks adaptation in top of cover and a stoving section of thick bamboo and the cover week side go up to be the circumference interval and be equipped with a plurality of locking bolts, locking bolt and internal thread blind hole looks adaptation and one-to-one, the head week side of locking bolt goes up the symmetry and is equipped with two bull sticks and all is equipped with the heat insulating mattress on this head and the bull stick, locking bolt's screw rod run through the cover and with cover threaded connection.

Preferably, the side wall of the cylinder cover is sleeved with a sealing ring, and the top of the cylinder cover and the outer wall of the drying cylinder are both provided with heat insulation layers.

The utility model has the advantages that: the utility model relates to a rationally, compact structure has the setting of the feed cylinder of through-hole for the splendid attire mushroom, the cooperation of being convenient for carries out the stoving operation of mushroom, and the mushroom of being more convenient for carries out the heat exchange, is favorable to improving drying efficiency and quality. Simultaneously, two sets of feed cylinders are convenient for set up in the setting of two horizontal extension boards, and the rotation of cooperation carousel can realize that two sets of feed cylinders are at mushroom stoving station and get the conversion of putting the station, can be when the mushroom to a set of feed cylinder is dried, carry out getting of mushroom and put the operation to another group of feed cylinder to realize going on in succession of mushroom stoving operation, drying efficiency is higher, the subsequent production and processing of the mushroom of being convenient for.

The arrangement of the electric heating pipe and the air heater can provide two heat sources of electricity and hot air, so that dual heating and drying are carried out, the heating is more uniform and effective, enough drying force is provided, the heating and drying effects can be greatly enhanced, and the drying efficiency and the drying quality of the mushrooms can be improved. Meanwhile, the temperature sensor is arranged, the temperature in the drying cylinder can be detected in real time in the drying process, and the temperature sensor is used for transmitting the temperature to the controller, so that the controller can automatically control the electric heating pipe according to the received temperature information, the working state of the air heater and the opening and closing of the first electromagnetic valve and the second electromagnetic valve, the switching of the drying mode between electric heating, hot air heating drying and natural air drying is realized, the automatic control of the electric heating and the hot air heating drying is realized, the operation is simpler and more convenient, the labor intensity and the operation difficulty of workers can be reduced, the automatic temperature control is realized, the temperature inside the drying cylinder is stabilized in a proper range, the temperature fluctuation is avoided, the temperature environment required by the mushroom drying is ensured, the drying quality is favorably improved, and the mushroom quality is ensured.

During the stoving, utilize the flexible of the piston rod of hydro-cylinder, can send the feed cylinder into the section of thick bamboo of drying earlier, fix the cover back on the section of thick bamboo of drying, alright utilize first motor and third motor, realize the revolution motion of feed cylinder and the rotation motion of stirring subassembly opposite direction, can form the convection current in the holistic circumference of material, the effect to mushroom dispersion stirring is strengthened greatly, can make the mushroom be heated everywhere more evenly, can further accelerate the moisture evaporation in the mushroom and run off, reinforcing stoving effect, improve drying efficiency and oven-dry mass, it is more complete thorough to the stoving of mushroom, be favorable to the subsequent production and processing of mushroom.

Drawings

Fig. 1 is a schematic view of the front view structure of the utility model before drying;

FIG. 2 is a left side view schematic diagram of the utility model during drying;

FIG. 3 is a schematic view of the front view of the cover of the present invention;

fig. 4 is a schematic front view of the section structure of the cartridge of the present invention.

Reference numbers in the figures: the device comprises a base 1, a drying cylinder 2, an air heater 3, a rotary table 4, a vertical column 5, a transverse support plate 6, an oil cylinder 7, a first motor 8, a rotating shaft 9, a cylinder cover 10, a rotating rod 11, a locking bolt 12, a charging cylinder 13, a charging door 14, a through hole 15, a second motor 16, a temperature sensor 17, a controller 18, an electric heating pipe 19, an air inlet pipe 20, a first electromagnetic valve 21, an air inlet fan 22, a second electromagnetic valve 23, a hot air pipe 24, an internal threaded blind hole 25, an exhaust pipe 26, an exhaust fan 27, an exhaust fan 28, a stirring shaft 29, a stirring rod 30 and a third motor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:

as shown in fig. 1 to 4, a drying device for mushroom production comprises a base 1, a drying cylinder 2 and a hot air blower 3 which are arranged in sequence. Base 1 is last to rotate and is equipped with carousel 4, carousel 4 is last to have set firmly stand 5, the top bilateral symmetry of stand 5 has set firmly two horizontal extension boards 6, be convenient for set up two sets of feed cylinders 13, cooperation carousel 4's rotation, can realize two sets of feed cylinders 13 and dry the station and get the conversion of putting the station at mushroom, can be when drying to the mushroom in a set of feed cylinder 13, carry out getting of mushroom and put the operation to another set of feed cylinder 13, thereby realize going on in succession of mushroom drying operation, drying efficiency is higher, be convenient for the subsequent production and processing of mushroom. The vertical hydro-cylinder 7 that has erect of one end that the stand 5 was kept away from to horizontal extension board 6, the first motor 8 of piston rod downwardly and fixedly connected with of hydro-cylinder 7 for output of first motor 8 is downwardly and fixedly connected with pivot 9, makes when using, utilizes hydro-cylinder 7 can realize the lift of feed cylinder 13, utilizes the rotation of first motor 8 drive pivot 9, can realize the holistic revolution motion of feed cylinder 13. The rotating shaft 9 is rotatably sleeved with a barrel cover 10 for matching with the sealing drying barrel 2. The bottom fixedly connected with feed cylinder 13 of pivot 9, the lateral wall opening of feed cylinder 13 and articulated be equipped with bin gate 14, all be equipped with a plurality of through-holes 15 on the section of thick bamboo wall of feed cylinder 13 and the bin gate 14 for the splendid attire mushroom, the cooperation of being convenient for carries out the stoving operation of mushroom, and the mushroom of being more convenient for carries out the heat exchange, is favorable to improving drying efficiency and quality. The feed cylinder 13 internal rotation is equipped with the stirring subassembly for disperse the stirring to the mushroom material, in order to strengthen stoving effect. The rotation direction of stirring subassembly is opposite with the rotation direction of pivot 9, in the drying process promptly, when utilizing pivot 9 to drive feed cylinder 13 and carrying out the revolution, the rotation motion of opposite direction can be done to the stirring subassembly, can be at the holistic circumference of material formation convection current, strengthen the effect to mushroom dispersion stirring greatly, can make the mushroom be heated more evenly everywhere, can further accelerate the evaporation of moisture and the loss in the mushroom again, the reinforcing stoving effect, improve drying efficiency and oven-dry mass, it is more complete thorough to the stoving of mushroom, be favorable to the subsequent production and processing of mushroom.

The top of the drying cylinder 2 is open and is detachably connected with the cylinder cover 10, a plurality of groups of electric heating pipes 19 are wound on the inner side wall, and one end of the bottom is communicated with an air inlet pipe 20. The air inlet pipe 20 is vertically arranged, an air inlet fan 22 is arranged in the top end of the air inlet pipe, and a first electromagnetic valve 21 is arranged at the bottom end of the air inlet pipe. The air outlet of the air heater 3 is communicated with the middle part of the air inlet pipe 20 through a hot air pipe 24 with a second electromagnetic valve 23. When the mushroom drying device is used, the electric heating pipe 19 and the air heater 3 are utilized to provide electricity and hot air, so that dual heating and drying are carried out, the heating is more uniform and effective, enough drying force is provided, the heating and drying effects can be greatly enhanced, and the mushroom drying efficiency and the mushroom drying quality are favorably improved. The upper portion of one side that the air-supply line 20 was kept away from to drying section of thick bamboo 2 communicates there is exhaust pipe 26, and exhaust pipe 26's tail end intercommunication has air exhauster 27 for provide the draft, at the stoving in-process, can in time discharge the moisture that evaporates and the air current after the heat transfer through exhaust pipe 26, can guarantee that drying section of thick bamboo 2 internal gas pressure is stable, can in time hydrofuge again, can further strengthen the stoving effect, guarantees drying efficiency and quality. The inner wall of the drying cylinder 2 is provided with a temperature sensor 17, the outer wall is provided with a controller 18, the temperature sensor 17, the electric heating pipe 19, the air heater 3, the first electromagnetic valve 21 and the second electromagnetic valve 23 are all electrically connected with the controller 18, so that in the drying process, the temperature in the drying cylinder 2 can be detected in real time by using the temperature sensor 17 and transmitted to the controller 18, the controller 18 can automatically control the working state of the electric heating pipe 19 and the air heater 3 and the opening and closing of the first electromagnetic valve 21 and the second electromagnetic valve 23 according to the received temperature information, thereby realizing the switching of the drying mode between electric heating, hot air heating drying and natural air drying, automatically controlling the electric heating and the hot air heating drying, having simpler and more convenient operation, reducing the labor intensity and the operation difficulty of workers, realizing automatic temperature control, and stabilizing the internal temperature of the drying cylinder 2 in a proper range, avoid the temperature to suddenly rise suddenly, guarantee the required temperature environment of mushroom stoving, be favorable to improving oven-dry quality, guarantee the mushroom quality. The air heater 3 can be an existing conventional industrial air heater, and the controller 18 can be an existing conventional PLC controller.

In the present embodiment, a second motor 16 is disposed in the base 1, and an output shaft of the second motor 16 extends upward out of the base 1 and is fixedly connected with the center of the turntable 4. When the device is used, the second motor 16 is used for providing power to drive the rotating disc 4 and the upright post 5 thereon to rotate, and the position conversion of the two material cylinders 13 can be realized. The second motor 16 may be a stepping motor in the prior art, so as to conveniently control the rotation angle of the turntable 4.

In this embodiment, the stirring assembly comprises a stirring shaft 28 vertically and rotatably arranged in the charging barrel 13, and the bottom end of the stirring shaft 28 extends out of the charging barrel 13 and is in transmission connection with a third motor 30. A plurality of groups of stirring paddles are uniformly distributed on the stirring shaft 28 at intervals up and down, and each group of stirring paddles consists of a plurality of stirring rods 29 which are radially arranged on the stirring shaft 28 and uniformly distributed at intervals along the circumference, so that when the mushroom material is dried, the stirring shaft 28 and the stirring rods 29 thereon can be driven by the third motor 30 to rotate in the direction opposite to that of the material barrel 13, the mushroom material is dispersedly stirred, and the drying operation is carried out in a matching way.

In this embodiment, the opening at the top of the drying cylinder 2 is in a reverse taper shape, and the opening is circumferentially provided with a plurality of blind holes 25 with internal threads at intervals, so as to facilitate connection with the cylinder cover 10. The open looks adaptation in top of section of thick bamboo 2 and section of thick bamboo 10 week of covering is gone up to be the circumference interval and is equipped with a plurality of locking bolts 12, locking bolt 12 and internal thread blind hole 25 looks adaptation and one-to-one for when using, accessible locking bolt 12 with section of thick bamboo 10 fixed connection on the top of section of thick bamboo 2 of drying, make section of thick bamboo 10 fixed, and make section of thick bamboo 2 of drying sealed relatively, in order to cooperate the operation of drying. The screw rod of locking bolt 12 runs through cover 10 and with cover 10 threaded connection, the head week side of locking bolt 12 is gone up the symmetry and is equipped with two bull sticks 11 and all is equipped with heat insulating mattress (not drawn in the figure) on this head and the bull stick 11, is convenient for under the circumstances that does not have other instruments, through the rotation of bull stick 11 control locking bolt 12, realizes locking bolt 12's precession back-and-forth movement, makes things convenient for quick assembly disassembly cover 10. Due to the arrangement of the heat insulation pad, the operation of workers is more convenient, and the workers are prevented from being scalded.

In this embodiment, a sealing ring (not shown) is sleeved on the sidewall of the cover 10 to ensure the sealing property of the connection between the cover 10 and the drying cylinder 2, so as to reduce heat dissipation and reduce energy consumption. The top of the cylinder cover 10 and the outer wall of the drying cylinder 2 are both provided with heat insulation layers (not shown in the figure), which can be made of heat insulation cotton in the prior art, so as to further reduce the heat loss in the drying process, facilitate the reduction of energy consumption and save cost.

The utility model discloses a theory of operation: the utility model discloses when using, move earlier and keep away from hydro-cylinder 7 on the horizontal extension board 6 of a stoving section of thick bamboo 2, make its piston rod extension, transfer the feed cylinder 13 that will correspond to suitable height, then open bin gate 14 on the feed cylinder 13, will treat the mushroom of drying and send into wherein. After the charging is completed, the material door 14 is closed, and the piston rod of the corresponding oil cylinder 7 is contracted to drive the corresponding material cylinder 13 to reset. Then, the second motor 16 is operated to drive the rotary disk 4 to rotate 180 degrees, so that the material cylinder 13 containing the mushrooms rotates to the upper part of the drying cylinder 2. Then, the oil cylinder 7 located above the drying cylinder 2 is operated, the piston rod of the oil cylinder is extended, the corresponding material cylinder 13 is pushed to move downwards until the cylinder cover 10 abuts against the top of the drying cylinder 2, and the cylinder cover 10 is fixed on the top of the drying cylinder 2 by using the locking bolt 12. Then, the circuit of the electric heating tube 19 is switched on, heating and drying are carried out in an electric heating mode, the air heater 3 and the air inlet fan 22 are operated simultaneously, the second electromagnetic valve 23 is opened, the first electromagnetic valve 21 is closed, hot air produced by the air heater is pumped into the drying cylinder 2 through the air inlet fan 22, and hot air heating is carried out. When electricity and hot-blast dual heating, operation first motor 8 and third motor 30 realize the revolution motion of feed cylinder 13 and the rotation motion of stirring subassembly opposite direction, carry out the dispersion stirring to the mushroom, make mushroom everywhere be heated more evenly to further accelerate the moisture evaporation in the mushroom and run off, reinforcing stoving effect. In-process, air exhauster 27 moves, provides the drawing of wind power, can in time discharge the moisture that evaporates and the air current after the heat transfer through exhaust pipe 26, can guarantee that the air pressure is stable in drying cylinder 2, can in time hydrofuge again, can further strengthen the stoving effect, guarantees drying efficiency and quality.

Meanwhile, in the drying process, the temperature sensor 17 can detect the temperature in the drying cylinder 2 in real time and transmit the temperature to the controller 18, when the temperature rises to exceed a set upper limit value, the controller 18 can automatically control to cut off the circuit of the electric heating pipe 19, stop running the air heater 3, close the second electromagnetic valve 23, open the first electromagnetic valve 21, stop heating electric and hot air, and only draw in normal-temperature air through the air inlet fan 22 for natural air drying, so that continuous drying and stable air pressure in the drying cylinder 2 are ensured. When the temperature drops below the set lower limit value, the controller 18 can automatically control to switch on the circuit of the electric heating pipe 19 again, the air heater 3 continues to operate, the second electromagnetic valve 23 is opened, the first electromagnetic valve 21 is closed, and the electric and hot air heating drying operation continues, so that the switching of the drying mode between the electric and hot air heating drying and the natural air cooling drying is realized, the electric heating and hot air heating drying are automatically controlled, the operation is simpler and more convenient, the labor intensity and the operation difficulty of workers can be reduced, the automatic temperature control is realized, the temperature inside the drying cylinder 2 is stabilized in a proper range, the temperature is prevented from being suddenly increased or decreased, the temperature environment required by the mushroom drying is ensured, the drying quality is favorably improved, and the quality of the mushrooms is ensured.

In addition, when the drying is performed, the mushroom material to be dried may be charged into the other cylinder 13 according to the aforementioned charging step. When the mushrooms in the drying cylinder 2 are dried, the corresponding cylinder cover 10 is firstly detached from the drying cylinder 2, and then the corresponding oil cylinder 7 is operated to reset to drive the corresponding material cylinder 13 to rise so as to move out of the drying cylinder 2. Then, the second motor 16 is operated to drive the rotary table 4 to rotate 180 degrees again, so that the dried material barrel 13 rotates to the other side, and the other material barrel 13 filled with the mushrooms to be dried rotates to the upper part of the drying barrel 2. At this time, the material cylinder 13 above the drying cylinder 2 can be dried again according to the above steps, and the dried shiitake mushrooms are taken out from the other material cylinder 13 and are reloaded to be dried, so that the shiitake mushrooms can be dried continuously.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (6)

1. The drying device for mushroom production is characterized by comprising a base, a drying barrel and an air heater which are sequentially arranged, wherein a rotary table is arranged on the base in a rotating mode, a vertical column is fixedly arranged on the rotary table, two transverse supporting plates are symmetrically and fixedly arranged on two sides of the top of the vertical column, an oil cylinder is vertically erected at one end, far away from the vertical column, of each transverse supporting plate, a piston rod of the oil cylinder faces downwards and is fixedly connected with a first motor, an output end of the first motor faces downwards and is fixedly connected with a rotary shaft, a barrel cover is rotatably sleeved on the rotary shaft, a charging barrel is fixedly connected to the bottom end of the rotary shaft, a charging door is arranged at an opening in the side wall of the charging barrel in a hinged mode, a plurality of through holes are formed in the barrel wall and the charging door of the charging barrel, a stirring assembly is arranged in the charging barrel in a rotating mode, the rotating direction of the stirring assembly is opposite to that the rotary shaft rotates, the top of the drying barrel is open and is detachably connected with the barrel cover, There is the air-supply line around being equipped with a plurality of groups electric heating pipe, bottom one end intercommunication on the inside lateral wall, be equipped with air inlet fan, bottom in the vertical setting of air-supply line and its top and be equipped with first solenoid valve, the air heater air outlet is through the hot-blast main intercommunication that has the second solenoid valve at the air-supply line middle part, one side upper portion intercommunication that the air-supply line was kept away from to the section of thick bamboo of drying has the exhaust pipe, exhaust pipe tail end intercommunication has the air exhauster, be equipped with the controller on the section of thick bamboo inner wall of drying, temperature sensor, electric heating pipe, air heater, first solenoid valve and second solenoid valve all are connected with the controller electricity.

2. The drying device for shiitake mushroom production according to claim 1, wherein a second motor is arranged in the base, and an output shaft of the second motor extends upwards out of the base and is fixedly connected with the center of the rotary table.

3. The drying device for mushroom production according to claim 1, wherein the stirring component includes a vertical stirring shaft which is rotatably arranged in the charging barrel, the bottom end of the stirring shaft extends out of the charging barrel and is connected with a third motor in a transmission manner, a plurality of groups of stirring paddles are uniformly distributed on the stirring shaft at intervals from top to bottom, and each group of stirring paddles consists of a plurality of stirring rods which are radially arranged on the stirring shaft and uniformly distributed at intervals on the circumference.

4. The drying device for shiitake mushroom production according to claim 1, wherein an opening at the top of the drying cylinder is in an inverted cone shape, and a plurality of blind holes with internal threads are circumferentially arranged at intervals at the opening.

5. The drying device for shiitake mushroom production according to claim 1, wherein the cover is adapted to the top opening of the drying cylinder, and a plurality of locking bolts are circumferentially arranged on the periphery of the cover at intervals, the locking bolts are adapted to the blind holes of the internal thread and correspond to the blind holes of the internal thread one by one, two rotating rods are symmetrically arranged on the periphery of the head of each locking bolt, heat insulation pads are arranged on the head and the rotating rods, and screws of the locking bolts penetrate through the cover and are in threaded connection with the cover.

6. The drying device for the shiitake mushroom production as claimed in claim 1, wherein a sealing ring is sleeved on the side wall of the cylinder cover, and heat insulation layers are arranged on the top of the cylinder cover and the outer wall of the drying cylinder.

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