CN211012342U

CN211012342U - Continuous grain drier

Info

Publication number: CN211012342U
Application number: CN201921984326.7U
Authority: CN
Inventors: 何树国; 赵国福; 任嘉宇; 褚文会; 温海江; 宋涛; 刘睿; 吴春升; 李少杰; 马忠才; 赵妍
Original assignee: Jiamusi Institute Of Agricultural Mechanization Heilongjiang Academy Of Agricultural Mechanical Engineering
Current assignee: Jiamusi Institute Of Agricultural Mechanization Heilongjiang Academy Of Agricultural Mechanical Engineering
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-07-14
Anticipated expiration: 2029-11-15

Abstract

The utility model provides a continuous type grain drier relates to grain drying equipment technical field, continuous type grain drier include the base and with the desiccator body that the base is connected, the desiccator body includes from last storage mechanism, drying mechanism, cooling body and the row's of connecting gradually under to material mechanism, arrange material mechanism include with the base is connected arrange material body and drive structure, just it includes the base to arrange the material body, set up guide structure on the base and arrange the material structure, arrange the material structure set up in guide structure's lower part, just arrange the material structure with drive structure is connected. Compared with the prior art, continuous type grain drier productivity ratio is high, the stoving homogeneity is good, and can prevent piling up of straw in the cereal, solves the problem that cereal flows not smoothly in the machine, and reliable operation, strong adaptability can satisfy the drying operation of multiple crops such as maize, rice, wheat.

Description

Continuous grain drier

Technical Field

The utility model relates to a grain drying equipment technical field particularly, relates to a continuous type grain drier.

Background

In recent years, with the progress of agricultural science and technology, the grain yield of China is increased year by year, the grain storage is more and more emphasized, and the grain after harvesting is subjected to dehumidification and drying treatment before storage, so as to reduce the internal moisture and the water content of the grain. On one hand, the energy consumption caused by the self-respiration of the grains can be reduced, and on the other hand, the germination and the mildew of the grains caused by overhigh moisture content are avoided.

The grain drying machine is mainly used for drying large-scale grains in the prior art, has the advantages of short dehydration time and high drying treatment efficiency, effectively ensures the quality of grain storage, reduces the probability of grain mildew and germination, plays a vital role in ensuring grain safety, is rapidly developed in recent years, is more and more popular with users, but has poor drying uniformity, low production rate, unsmooth discharging, easy accumulation, formation of scorched grains and influence on drying quality.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem be that traditional grain drier drying uniformity is poor, and productivity ratio is low, arranges at least one aspect in the material is not smooth and easy.

In order to solve the problem, the utility model provides a continuous type grain drier, including the base and with the desiccator body that the base is connected, the desiccator body includes from last to the storage mechanism, drying mechanism, cooling body and the row's of connecting gradually down material mechanism, arrange material mechanism include with the base is connected arrange material body and drive structure, just it includes the base to arrange the material body, set up guide structure and row's material structure on the base, arrange the material structure set up in guide structure's lower part, just arrange the material structure with drive structure is connected.

Optionally, the material discharging structure comprises a first material discharging structure and a second material discharging structure which are symmetrically arranged along the center line of the base, and the first material discharging structure and the second material discharging structure are identical in structure.

Optionally, the discharging structure further comprises a reversing structure, the reversing structure is in chain transmission connection with the first discharging structure and the second discharging structure respectively, and the reversing structure is in belt transmission connection with the driving structure.

Optionally, the first discharging structure comprises a first discharging roller and a second discharging roller which are connected with each other, and the first discharging roller and the second discharging roller are sequentially arranged in a direction away from the central line of the base.

Optionally, the guide structure includes a first guide structure and a second guide structure with the same structure, and the first guide structure and the second guide structure are connected to each other and symmetrically arranged along a central line of the base.

Optionally, an included angle structure is formed at a joint of the first guide structure and the second guide structure.

Optionally, the material storage mechanism comprises a feed port and a material distribution structure connected with the bottom of the feed port.

Optionally, the drying mechanism includes a drying structure body, and the drying structure body includes a first drying structure and a second drying structure connected to each other, the first drying structure and the second drying structure are respectively used for being communicated with two ends of the material distributing structure, the first drying structure and the second drying structure are of the same rectangular structure, and the first drying structure includes a first drying structure body and a reinforcing upright column arranged at four corners of the first drying structure body.

Optionally, the drying mechanism further comprises an air inlet chamber and an air outlet chamber connected with the reinforcing upright post, the air inlet chamber comprises a first air inlet chamber, a second air inlet chamber and a third air inlet chamber, the first air inlet chamber and the second air inlet chamber respectively extend along two ends of the drying structure body in the length direction to the height direction of the drying structure body, and the third air inlet chamber is arranged between the first drying structure and the second drying structure; the exhaust chamber includes first exhaust chamber and second exhaust chamber, just first exhaust chamber with the second exhaust chamber is followed respectively dry structure body width direction's both ends to the direction of height extension setting of dry structure body.

Optionally, the cooling mechanism includes a first cooling structure and a second cooling structure connected to each other, and the first cooling structure is configured to be connected to the first drying structure, and the second cooling structure is configured to be connected to the second drying structure.

The utility model discloses a continuous type grain drier productivity ratio is high, the stoving homogeneity is good, and can prevent piling up of straw in the cereal, solves the problem that cereal flows not smoothly in the machine, and reliable operation, strong adaptability can satisfy the drying operation of multiple crops such as maize, rice, wheat.

Drawings

FIG. 1 is a schematic view of a continuous grain dryer according to an embodiment of the present invention;

FIG. 2 is a side view of FIG. 1;

fig. 3 is a schematic structural view of a material storage mechanism in an embodiment of the present invention;

FIG. 4 is a top view of FIG. 3 (with the top cover removed);

fig. 5 is a schematic structural diagram of a drying mechanism in an embodiment of the present invention;

FIG. 6 is a top view of FIG. 5 (with the corner vent box removed);

FIG. 7 is a schematic view of the air inlet and exhaust directions of the drying mechanism in the embodiment of the present invention;

FIG. 8 is a schematic view of the air intake and exhaust directions of the cooling mechanism in the embodiment of the present invention;

FIG. 9 is a front cross-sectional view of a discharge mechanism (with the side wall plate and discharge motor removed) in an embodiment of the present invention;

fig. 10 is a partially enlarged schematic view at D in fig. 9.

The reference numerals are explained below:

1-a material storage mechanism, 11-a material inlet, 12-a material distribution structure, 13-a night vision camera, 2-a drying mechanism, 21-a first air inlet chamber, 22-a second air inlet chamber, 23-a third air inlet chamber, 24-a first air exhaust chamber, 25-a second air exhaust chamber, 26-a reinforced upright post, 27-a section steel frame, 28-a side wall plate, 29-a ventilation box, 3-a cooling mechanism, 4-a material discharge mechanism, 41-a base, 42-a first guide structure, 43-a second guide structure, 44-a first material discharge roller, 45-a second material discharge roller, 46-a gin pole and 5-a base.

Detailed Description

Before grains such as rice, wheat and the like are stored, the grains need to be dried, the grains are usually exposed to the sun, the drying method is low in efficiency and easy to be affected by weather and geographical environment, many farmers have potential safety hazards when exposing the grains to the sides of roads, and a grain dryer is usually used for replacing the traditional grain drying method.

The grain drier comprises main components such as a hot blast stove, a motor, a ventilator, a stacking rack and the like, has the advantages of short dehydration time and high drying treatment efficiency, effectively ensures the quality of grain storage, reduces the probability of grain mildewing and sprouting, plays a vital role in ensuring grain safety, is rapidly developed in recent years and is more and more popular with users, but the traditional grain drier has poor drying uniformity, low production rate, unsmooth discharging and easy accumulation, forms scorched grains and affects the drying quality.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it should be understood that the forward direction of "X" in the drawings represents the right direction, the reverse direction of "X" represents the left direction, the forward direction of "Y" represents the front direction, the reverse direction of "Y" represents the rear direction, the forward direction of "Z" represents the upper direction, the reverse direction of "Z" represents the lower direction, and the directions or positional relationships indicated by the terms "X", "Y", "Z", etc. are based on the directions or positional relationships shown in the drawings of the specification, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. The description of the term "some embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Throughout this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

As shown in fig. 1-2, an embodiment of the present invention provides a continuous grain drying machine, which includes a base 5 and a drying machine body connected to the base 5, wherein the drying machine body includes a material storage mechanism 1, a drying mechanism 2, a cooling mechanism 3 and a material discharging mechanism 4, which are sequentially connected from top to bottom, and adjacent structures are connected in a combined manner, and are first connected by bolts and then welded together, so that the continuous grain drying machine is convenient to install and is firm in connection; the discharging mechanism 4 comprises a discharging body and a driving structure which are connected with the base 5, the discharging body comprises a base 41, a guide structure and a discharging structure are arranged on the base 41, the discharging structure is arranged on the lower portion of the guide structure, and the discharging structure is connected with the driving structure.

In this embodiment, the dryer body of the continuous grain dryer comprises a storage mechanism 1, a drying mechanism 2, a cooling mechanism 3 and a discharging mechanism 4 which are sequentially connected from top to bottom, and adjacent structures are connected in a combined manner, so that the continuous grain dryer is reliable in operation and high in adaptability, and can meet the drying operation of various crops such as corn, rice, wheat and the like; when the continuous grain dryer is in a working state, grains to be dried enter the continuous grain dryer from the storage mechanism 1, sequentially flow through the drying mechanism 2 and the cooling mechanism 3, and finally enter the discharge mechanism 4, and the continuous grain dryer continuously works, so that the production rate is high, and the drying uniformity is good; the discharging mechanism 4 comprises a driving mechanism, a guiding structure and a discharging structure, when grains flow through the discharging mechanism, the discharging structure operates to discharge the grains out of the machine along the guiding structure under the action of the driving mechanism, so that the accumulation of straws in the grains is prevented, and the problem that the grains flow unsmoothly in the machine is solved.

As shown in fig. 3-4, preferably, the storage mechanism 1 is disposed at the uppermost portion of the dryer body, and includes a storage structure body and reinforcing columns disposed at four corners of the storage structure body, so that the overall structure is high in strength, and convenient to install and construct. In some specific embodiments, the reinforcing upright posts are thick-wall square tubes, adjacent reinforcing upright posts are welded together by using a profile steel frame, and the profile steel frame is welded with a side wall plate, so that the structure is simple, the requirements of large capacity and safety of a large dryer are met, and the installation and construction are convenient.

Preferably, the storing mechanism 1 further comprises a feeding port 11 and a material distributing structure 12 connected with the bottom of the feeding port 11, grain enters the machine from the feeding port 11 and flows into the drying mechanism 2 through the material distributing structure 12, and uniform grain distribution in the machine can be ensured.

Preferably, the storage mechanism 1 is provided with an all-weather video monitoring system, and the all-weather video monitoring system is connected with the control system, so that an operator of the drying machine can see the flowing condition of grains in the storage mechanism 1 in a control room, and the operation is convenient and reliable. In some preferred embodiments, two night vision cameras 13 are oppositely arranged on the inner wall of the storage mechanism 1, so that the monitoring is convenient and the cost is low.

As shown in fig. 5-6, preferably, the drying mechanism 2 includes a drying structure body, and the drying structure body includes a first drying structure and a second drying structure connected to each other, and the first drying structure and the second drying structure are respectively used for communicating with two ends of the material distributing structure 12, so that the grains uniformly flow into the first drying structure and the second drying structure from the material distributing structure 12 for drying.

In some embodiments, the first drying structure and the second drying structure are identical rectangular structures and may be interconnected in a multi-section combination depending on the capacity of the dryer. The utility model discloses in, do not do specific restriction to the connected mode, can be for the connected mode that can think wantonly, in some preferred embodiments, use bolted connection then seam, easy to assemble and firm in connection earlier.

Preferably, first dry construction includes first dry construction body and sets up in the enhancement stand 26 of first dry construction body four corners department, and complete machine structural strength is high, installation construction convenience. In some specific embodiments, the reinforcing columns 26 are thick-wall square tubes, the adjacent reinforcing columns 26 are welded together by using the steel frame 27, and the side wall plates 28 are welded on the steel frame 27, so that the structure is simple, the requirements of large capacity and safety of a large-scale dryer are met, and the installation and construction are convenient.

Preferably, first dry structure body includes relative first lateral wall and the second lateral wall that sets up, and sets up first vent and second vent on first lateral wall and second lateral wall respectively, and first vent with the second vent is connected through ventilation box 29, the utility model discloses in, do not do specific restriction to the shape of ventilation box 29, in some preferred embodiments, the shape of ventilation box 29 is the horn shape, and ventilation effect is good.

Preferably, the drying mechanism 2 further comprises an air inlet chamber and an air outlet chamber which are connected with the reinforcing upright post 26, wherein the air inlet chamber comprises a first air inlet chamber 21, a second air inlet chamber 22 and a third air inlet chamber 23, the first air inlet chamber 21 and the second air inlet chamber 22 respectively extend towards the height direction of the drying structure body along the two ends of the length direction of the drying structure body, and the third air inlet chamber 23 is arranged between the first drying structure and the second drying structure; the exhaust chamber includes first exhaust chamber 24 and second exhaust chamber 25, and first exhaust chamber 24 and second exhaust chamber 25 extend the setting to the direction of height of dry structure body along the both ends of dry structure body width direction respectively.

In this embodiment, the length direction of the drying structure body refers to the positive direction or the negative direction of X in fig. 5, the width direction of the drying structure body refers to the positive direction or the negative direction of Y in fig. 6, and the height direction of the drying structure body refers to the positive direction or the negative direction of Z in fig. 5. The air inlet direction and the air exhaust direction of the drying structure in the working state are shown in fig. 7, wherein the direction of an arrow A is the air inlet direction, and the direction of an arrow B is the air exhaust direction, so that grains can be fully and uniformly contacted with hot air when flowing from top to bottom in the drying machine, and no drying dead angle exists.

Preferably, the cooling mechanism 3 comprises a first cooling structure and a second cooling structure connected to each other, the first cooling structure and the second cooling structure being identical in structure, and the first cooling structure is configured to be connected with the first drying structure, and the second cooling structure is configured to be connected with the second drying structure. The air inlet direction and the exhaust direction of the cooling mechanism 3 in the working state are shown in fig. 8, wherein the direction of an arrow A is the air inlet direction, the direction of an arrow B is the exhaust direction, and when dried grains flow through the cooling mechanism 3, the grains can be in full and uniform contact with cold air, so that the grains are cooled and lowered, and the requirements of moisture and temperature of the grains discharged from the machine are met.

Preferably, first cooling structure includes first cooling structure body and sets up in the enhancement stand of first cooling structure body four corners department, and complete machine structural strength is high, installation construction convenience. In some specific embodiments, the reinforcing upright posts are thick-wall square tubes, adjacent reinforcing upright posts are welded together by using a profile steel frame, and the profile steel frame is welded with a side wall plate, so that the structure is simple, the requirements of large capacity and safety of a large dryer are met, and the installation and construction are convenient.

Preferably, the driving mechanism comprises a discharging motor, and stepless speed regulation is adopted to meet the moisture requirement of the grain discharging machine. If cereal goes out quick-witted moisture and is higher than actual requirement, then reduce row material motor speed, arrange the material speed and slow down, the stoving time of extension cereal in the desiccator, if cereal goes out quick-witted moisture and is less than actual requirement, then improve row material motor speed, arrange the material speed and become fast, reduce the stoving time of cereal in the desiccator, through the regulation of arranging the material motor, make cereal satisfy the agricultural requirement.

As shown in fig. 9, preferably, the discharging mechanism 4 includes a discharging mechanism body and reinforcing columns disposed at four corners of the discharging mechanism body, so that the overall structure is high in strength and convenient to install and construct. In some specific embodiments, the reinforcing upright posts are thick-wall square tubes, adjacent reinforcing upright posts are welded together by using a profile steel frame, and the profile steel frame is welded with a side wall plate, so that the structure is simple, the requirements of large capacity and safety of a large dryer are met, and the installation and construction are convenient.

Preferably, the discharging structure further includes a first discharging structure and a second discharging structure symmetrically disposed along the central line of the base 41, and the first discharging structure and the second discharging structure have the same structure and are disposed inside the discharging mechanism body. The utility model discloses in, do not do specific restriction to the shape of base 41, in some preferred embodiments, base 41 is the rectangle, installs on base 5, still plays the effect of supporting whole desiccator when guaranteeing even row material.

Preferably, arrange the material structure and still include the switching-over structure, the switching-over structure is arranged material structure and second and is arranged material structure chain drive connection with first respectively, and the switching-over structure is arranged material motor belt drive with the material and is connected. In some specific embodiments, the reversing structure is a double-shaft output forward and reverse speed reducer, the structure is simple, and a proper model can be selected to be directly purchased in the market according to actual requirements.

Preferably, the first discharging structure comprises a first discharging roller 44 and a second discharging roller 45 which are connected in series, and the first discharging roller 44 and the second discharging roller 45 are sequentially arranged in a direction away from the central line of the base 41. The utility model discloses in, do not do specific restriction to the quantitative form of first row material roller 44 and second row material roller 45, can customize as required.

In some preferred embodiments, the number of the first discharging rollers 44 is 4, the number of the second discharging rollers 45 is 1, accordingly, the number of the first discharging rollers 44 in the second discharging structure is 4, the number of the second discharging rollers 45 is 1, 8 first discharging rollers 44 are arranged in the middle, two second discharging rollers 45 are respectively arranged at two ends of the first discharging rollers 44 and respectively close to the inner side walls of the first discharging structure and the second discharging structure, namely, 5 discharging rollers are respectively arranged at the left side and the right side of the center line of the base 41, 4 first discharging rollers 44 and 1 second discharging roller 45 are respectively arranged at the left side and the right side of the center line of the base 41, two shafts of the double-shaft output forward and reverse rotation reducer are respectively connected with the first discharging rollers 44 close to the center line of the base 41 and drive the discharging rollers symmetrically arranged at two sides of the center line of the base 41 to rotate in opposite directions, in some specific examples, when the 5 discharging rollers at the left side of the center line of the base 41 rotate, the 5 discharging rollers at the right side of the central line of the base 41 rotate in the anticlockwise direction; when the 5 discharge rollers on the left side of the center line of the base 41 rotate in the counterclockwise direction, the 5 discharge rollers on the right side of the center line of the base 41 rotate in the clockwise direction, as shown in fig. 9, wherein the arrow E is the rotation direction of the discharge roller on the left side of the center line of the base 41, and the arrow F is the rotation direction of the discharge roller on the right side of the center line of the base 41.

In some preferred embodiments, the number of sprockets mounted on the second discharge roller 45 is less than the number of sprockets mounted on the first discharge roller 44, so that the second discharge roller 45 rotates at a higher speed than the first discharge roller 44, increasing sidewall grain flowability.

As shown in fig. 10, the second discharging roller 45 is preferably provided with a raking bar 46, which can prevent the straw from being accumulated at the corner of the sidewall in the grain and solve the problem of the grain not flowing smoothly in the machine.

Preferably, the guiding structure comprises a first guiding structure 42 and a second guiding structure 43 with the same structure, and the first guiding structure 42 and the second guiding structure 43 are connected with each other and symmetrically arranged along the center line of the base 41. In some embodiments, the first guiding structure 42 and the second guiding structure 43 are guiding plates having a convex structure, so that two guiding plates at the outermost side close to the inner side wall plate of the discharging mechanism form an included angle with the vertical side wall plate, thereby ensuring smooth grain flowing of the discharging mechanism without dead angle.

The utility model discloses in, do not do specific restriction to the quantity of first guide structure 42 and second guide structure 43, can customize as required. In some embodiments, the number of the first material guiding plates is 5, the number of the second material guiding plates is 5, and the first material guiding plates and the second material guiding plates on two sides of the center line of the base 41 are connected to each other, and an included angle C is formed at the connection position. In some preferred embodiments, the included angle C is 80 °, which ensures smooth discharging in the middle of the discharging section and ensures the strength of the material guide plate.

Preferably, a discharge hopper is provided below the base 41, and discharged grains flow out of the machine through the discharge hopper. The utility model discloses in, do not do specific restriction to the connected mode of row's hopper and base 41, in some embodiments, row's hopper welds with base 41, firm in connection.

In some embodiments, the continuous grain dryer of the present invention comprises two discharging mechanisms 4, i.e. a first discharging mechanism 4 and a second discharging mechanism 4, wherein the first discharging mechanism 4 is connected to the first cooling structure, and the second discharging mechanism 4 is connected to the second cooling structure.

Therefore, the continuous grain dryer has high productivity and good drying uniformity, can prevent the accumulation of straws in grains, solves the problem of unsmooth flow of the grains in the machine, has reliable work and strong adaptability, and can meet the drying operation of various crops such as corn, rice, wheat and the like.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Without departing from the spirit and scope of the present disclosure, those skilled in the art can make various changes and modifications, which will fall into the scope of the present disclosure.

Claims

1. The utility model provides a continuous type grain drier, its characterized in that, including base (5) and with the desiccator body that base (5) are connected, the desiccator body includes from last storage mechanism (1), drying mechanism (2), cooling body (3) and row material mechanism (4) that connect gradually extremely down, arrange material mechanism (4) include with row material body and the drive structure that base (5) are connected, just it includes base (41) to arrange the material body, set up guide structure on base (41) and arrange the material structure, arrange the material structure set up in guide structure's lower part, just arrange the material structure with the drive structure is connected.

2. The continuous grain dryer as claimed in claim 1, wherein the discharge structure comprises a first discharge structure and a second discharge structure symmetrically arranged along a center line of the base (41), and the first discharge structure and the second discharge structure are identical in structure.

3. The continuous grain dryer of claim 2, wherein the discharge structure further comprises a reversing structure in chain drive connection with the first and second discharge structures, respectively, and in belt drive connection with the drive structure.

4. The continuous grain dryer according to claim 2, wherein the first discharging structure comprises a first discharging roller (44) and a second discharging roller (45) connected to each other, and the first discharging roller (44) and the second discharging roller (45) are sequentially arranged away from a center line of the base (41).

5. Continuous grain dryer according to claim 1, characterized in that the guide structure comprises a first guide structure (42) and a second guide structure (43) of identical construction, and that the first guide structure (42) and the second guide structure (43) are connected to each other and are symmetrically arranged along the centre line of the base (41).

6. Continuous grain dryer according to claim 5, characterized in that the connection of the first guide structure (42) and the second guide structure (43) forms an angle structure.

7. Continuous grain dryer according to claim 1, characterized in that the storage means (1) comprise a feed opening (11) and a distribution structure (12) connected to the bottom of the feed opening (11).

8. The continuous grain drier according to claim 7, wherein the drying mechanism (2) comprises a drying structure body, and the drying structure body comprises a first drying structure and a second drying structure connected with each other, the first drying structure and the second drying structure are respectively used for being communicated with two ends of the material distributing structure (12), the first drying structure and the second drying structure are identical rectangular structures, and the first drying structure comprises a first drying structure body and reinforcing columns (26) arranged at four corners of the first drying structure body.

9. The continuous grain drying machine according to claim 8, wherein the drying mechanism (2) further comprises an air inlet chamber and an air outlet chamber connected with the reinforcing column (26), the air inlet chamber comprises a first air inlet chamber (21), a second air inlet chamber (22) and a third air inlet chamber (23), the first air inlet chamber (21) and the second air inlet chamber (22) are respectively arranged along two ends of the length direction of the drying structure body and extend towards the height direction of the drying structure body, and the third air inlet chamber (23) is arranged between the first drying structure and the second drying structure; the exhaust chamber includes first exhaust chamber (24) and second exhaust chamber (25), just first exhaust chamber (24) with second exhaust chamber (25) are followed respectively drying structure body width direction's both ends to drying structure body's direction of height extends the setting.

10. Continuous grain dryer according to claim 8, characterized in that the cooling means (3) comprise a first cooling structure and a second cooling structure connected to each other, and that the first cooling structure is intended to be connected to the first drying structure and the second cooling structure is intended to be connected to the second drying structure.