KR100523439B1 - Circulation-type grain dryer having a far infrared system - Google Patents

Abstract

Disclosed are radiators of a circulating grain dryer. The radiator according to the present invention comprises: a combustion unit having a combustion furnace in which first combustion holes and second combustion holes are formed in upper and lower circumferential surfaces adjacent to the other end while being horizontally disposed in the central hot air chamber; Blocking plate mounted on one side of the furnace to prevent external air from being directly transferred to the furnace, and the other end has an open cylindrical shape while the other end is disposed through the barrier plate and one end of the combustion furnace An ignition unit having a burner crater that communicates with the inside of the furnace and has a burner mounted on one end thereof; An upper exhaust portion having an upper and lower ends and having an upper exhaust pipe fixedly disposed horizontally on a radially upper portion of the combustion furnace and extending to one side of the combustion furnace while defining a first combustion hole; And a lower exhaust having one end and an upper shape and having a lower exhaust pipe horizontally fixed to the radially lower portion of the furnace to extend to one end side of the furnace while defining a second combustion hole.

Description

Circulation-type grain dryer having a far infrared system

The present invention relates to a radiator of a circulating grain dryer, and more particularly, to uniform temperature distribution in a drying chamber, to improve productivity, to facilitate assembly and maintenance, and to maximize drying time and thermal efficiency. The present invention relates to a radiator of a circulating grain dryer, which can reduce the germination rate and the copper activity rate, as well as saving.

In general, grains such as rice and barley harvested from the mountain region are required to be dried for storage and transportation until reaching the consumer. This is because grains such as rice and barley harvested from the mountain region have too much moisture to be stored and transported without damage. That is, grains such as rice and barley harvested from the mountain region have a water content of about 20 to 30%, and grains having such water content are easily deteriorated during deposition for storage and are difficult to store.

Moisture content of grains such as rice and barley is one of the important factors that influence the taste, and is also very important in maintaining quality and preventing the occurrence of insects. However, when rice is cooked with rice or barley having a water content higher than a desired value, the starch is eluted, and the original shape of the rice grains cannot be maintained. Therefore, grains such as rice and barley harvested from mountain areas should be dried to have a moisture content of about 14 to 15.5% for safe storage, transportation, and preservation of food before delivery to consumers.

To this end, conventionally, the rice or barley was dried by spreading the grains of rice or barley in a rural courtyard or on a roadside. However, due to the geographical location conditions, it is very difficult to dry grains in the case of low sunshine or rainy weather. In addition, in recent years, as the rural population has sharply decreased, it is very difficult to naturally expose rice and barley when farming in large quantities.

Recently, a circulating grain dryer developed to solve this problem has been widely used. Circulating grain dryer is a device for forcibly supplying dry hot air to grains such as rice or barley and drying the rice or barley to contain a certain moisture.

Figure 5a is a front view of the circulating grain dryer according to the prior art, Figure 5b is a right side view of the circulating grain dryer shown in Figure 5a, Figures 6a and 6b is an internal structural diagram of the circulating grain dryer according to the prior art. And, Figure 7 is a view showing a radiator according to the prior art.

5a to 6b, the circulating grain dryer 10 according to the prior art is a grain input door 12, a lower feeder 14 for conveying grains, an elevator 16, an upper feeder 18 ) And the fungus 20, a storage chamber 30 for storing grains, a drying chamber 40 for drying grains by dry hot air, a machine room 50 with various machinery, a burner 98 for supplying heat sources , A blower 60 and a control device 70.

Grain input door 12 is installed on the left and right of the drying chamber (40). The lower conveying device 14 made of screws is mechanically connected to the lower end of the elevator 16. The elevator 16 has a bucket 17, the upper end of the elevator 16 is mechanically connected to the upper feeder 18 made of a screw. The fungicide 20 disposed below the distal end of the upper transfer device 18 evenly distributes the grains transferred from the upper transfer device 18 into the storage compartment 30. To this end, the fungus 20 is provided with a rotating shaft 21 and the rotating plate (22). The rotating plate 22 distributes the grain evenly while rotating by the rotating shaft 21.

The storage room 30 stores the first input grains, and cools the grains of which grain temperature has risen to room temperature while circulating in the grain dryer 10. In the drying chamber 40 where the drying of the grains is performed, the radiator 90 (see FIG. 7), the left and right ventilating chambers 42, the central hot air chambers 44, the ventilating passages 46, and the center of the grain layer are formed. The perforated net 32, the rectangular perforated net 34, the shutter drum 36, and the burner 98 are installed. In the central hot air chamber 44, a temperature sensor (not shown) for detecting the temperature of the dry hot air is disposed. The blower 60 is installed at one side of the drying chamber 40. The blower 60 forcibly discharges the drying hot air in the drying chamber 40 to the outside. At this time, the radiator 90 is bent inward from the one end of the central hot air chamber 44, the other end of the combustion furnace 92 is bent to the upper side of the combustion furnace 92, the central hot air chamber 44 The exhaust pipe 94 is mounted to extend to one end. A gap 96 is formed between the combustion furnace 92 and the exhaust pipe 94 for smooth ignition. At this time, a burner 98 is mounted at one end of the combustion furnace 92.

On the other hand, the automatic moisture measuring device 54 is installed on the lower end of the elevator (16). The automatic moisture measuring device 54 automatically measures the moisture of the grains being conveyed through the lower conveying device 14. An elevator motor 19 for driving the elevator 16 is disposed at an upper side of the grain dryer 10. The grain discharge pipe 56 is installed near the elevator motor 19. The grain discharge pipe 56 extends downwardly from the upper transfer device 18 to the outside of the grain dryer 10.

In addition, the selection device 80 is disposed above the grain dryer 10. When the grain is transferred to the fungus 20 through the upper transfer device 18, the selection device 80 separates and removes the foreign matter contained in the grain, for example, chaff or straw from the grain, thereby removing the grain. Make it. The selector 80 includes a main body 82, a backing fan 86, and a discharge pipe 88.

The operation of the conventional circulation grain dryer 10 configured as described above is briefly described as follows.

First, grains such as rice or barley are introduced into the grain dryer 10 through the grain input door 12. After injecting the grain, the grain input door 12 is closed and the control device 70 is operated to operate the grain dryer 10. The grain is then transferred to the lower end of the elevator 16 by the lower feeder 14. The grain is conveyed to the upper end of the grain dryer 10 by the bucket 17 of the elevator 16. Thereafter, the grains are transferred to the center portion of the grain dryer 10 body by the upper transfer device 18. At this time, foreign matter contained in the grain is separated and removed by the selection device (80). Grain from which foreign matter is removed is transferred to the fungus 20 through the upper conveying device 18, and then falls onto the rotating plate 22 of the fungus 20. The fungus 20 uniformly distributes the grains into the storage chamber 30 by the centrifugal force of the rotating plate 22. At this time, the input grains are stacked in a mortar shape in the storage compartment (30). That is, the uprights are dispersed around the storage compartment 30, and the gumbules or unmatureds are gathered in the center so that the outside is stacked in a high mortar shape with a low central portion.

Grain accumulated in the storage chamber 30 continues into the central perforated network 32 and the rectangular perforated network 34 provided in the drying chamber 40 to form a grain layer. Under this condition, the drying hot air generated by the burner is introduced into the central hot air chamber 44 of the drying chamber 40 by the suction blower 60 provided at one side of the drying chamber 40 to remove moisture of the grains. The dry hot air introduced into the central hot air chamber 44 flows toward the left and right air exhaust chambers 42 after passing through the grain layers formed in the central perforated network 32 and the rectangular perforated network 34. Next, after flowing along the exhaust path 46, it is discharged to the outside via the blower 60.

Thereafter, by operating the control device 70 to select the drying operation mode of the control system, the blower 60 and the respective motors of the driving unit are operated and are controlled by a temperature sensor installed in the central hot air chamber 44 of the drying chamber 40. Combustion control of the burner is started to dry the grain.

 As described above, the grains released by the operation are dropped to the lower portion of the drying chamber 40 through the shutter drum 36, and then the lower conveying device 14, the elevator 16, and the upper conveying device 18. And it is circulated through the grain dryer 20 in the grain dryer (10). Sufficiently dried grain is repeatedly discharged to the outside of the grain dryer 10 through the grain discharge pipe 56 while repeatedly circulating in the grain dryer 10.

However, in the conventional grain dryer 10 configured as described above, the radiator 90 disposed in the central hot air chamber 44 of the drying chamber 40 has a structural shape of the combustion furnace 92 and the exhaust pipe 94. Due to this, the temperature distribution inside the drying chamber 40 was not uniform, and there was a problem that the ignition was unstable according to the air volume control and the outdoor air condition. In addition, a part of the hot gas is leaked by the gap 96 formed between the combustion furnace 92 and the exhaust pipe 94 to stabilize the ignition, thereby degrading the quality due to partial overheating.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is to uniformize the temperature distribution inside the drying chamber, improve the productivity and assembling, maintenance smooth as well as drying time and thermal efficiency In order to maximize energy savings, it is possible to provide a radiator of a circulating grain dryer that can increase germination rate and reduce copper activity rate.

In order to achieve the object of the present invention as described above, the present invention,

The lower feeder, the lifter, the upper feeder, the sorting device and the fungus for transporting the grain fed through the grain input door, the storage chamber for storing the grain, and the drying chamber for drying the grain by hot air are provided. A circular grain dryer having a central hot air chamber in which a radiator is embedded, a central perforated network having a grain layer formed therein, a rectangular perforated net and a left and right perforated net, and a shutter drum for transporting moisture-depleted grains downward,

The emitter;

A combustion unit having a combustion furnace in which first combustion holes and second combustion holes are formed at upper and lower circumferential surfaces adjacent to the other end while being horizontally disposed in the central hot air chamber;

Blocking plate mounted on one side of the furnace to prevent external air from being directly transferred to the furnace, and the other end has an open cylindrical shape while the other end is disposed through the barrier plate and one end of the combustion furnace An ignition unit having a burner crater that communicates with the inside of the furnace and has a burner mounted on one end thereof;

An upper exhaust portion having an upper and lower ends and having an upper exhaust pipe fixedly disposed horizontally on a radially upper portion of the combustion furnace and extending to one side of the combustion furnace while defining a first combustion hole; And

The radiator of the recirculating grain dryer having a lower exhaust having one end and an upper shape and horizontally fixedly disposed at a radially lower portion of the furnace to extend the first side of the furnace while defining a second combustion hole. To provide.

As described above, according to the present invention, it is possible to uniformize the temperature distribution in the drying chamber, improve productivity, facilitate assembly and maintenance, and maximize drying time and thermal efficiency, thereby saving energy and increasing germination rate. The copper duty rate can be reduced.

Hereinafter, with reference to the accompanying drawings will be described a radiator of a circulating grain dryer according to an embodiment of the present invention.

1 is an exploded perspective view showing the decomposition of the radiator of the circulating grain dryer according to the invention, Figure 2 is a combined perspective view showing the bonding state of the radiator shown in Figure 1, and Figure 3 is along the line AA of Figure 2 It is a sectional view shown.

1 to 3, the radiator 100 of the recirculating grain dryer according to the present invention is the lower conveying device 14, the elevator 16, the upper conveying device for conveying the grain input through the grain input door 12 The apparatus 18, the selection apparatus 80 and the fungus branch 20, the storage chamber 30 for storing grain, and the drying chamber 40 for drying grain by hot air are provided, and the inside of the drying chamber 40 is centered. Circulation type having hot air chamber 44, a central perforated net 32 on which grain layers are formed, a rectangular perforated net 34 and a left and right perforated net 35, and a shutter drum 36 for transferring the moisture-depleted grain to the bottom. It is mounted to the grain dryer 10. At this time, the radiator 100 is mounted in the central hot air chamber 44 of the drying chamber 40.

The radiator 100 includes the combustion unit 110, the ignition unit 120 disposed at one end of the combustion unit 110, the upper exhaust unit 140 and the lower vessel disposed at the upper and lower portions of the combustion unit 110. It has a base 160.

First, the combustion unit 110 is provided in the central hot air chamber (44) horizontally with a cylindrical combustion furnace 112 is closed at both ends. On the circumferential surface adjacent to one end of the combustion unit 110, a plurality of ignition holes 114 are formed so that ignition can be made smoothly, and the first combustion hole 116a on the upper and lower portions of the circumferential surface adjacent to the other end. And the second combustion hole 116b are formed. Preferably, the ignition hole 114 is formed at either the radially upper or lower portion of the combustion furnace 112. More preferably, the combustion furnace 112 is heat-cured in a drying furnace at 250 ° C. for 20 minutes in a state where the ceramic paint 118 is sprayed to prevent far infrared rays from being emitted on the outer circumferential surface. The ignition unit 120 is mounted to the combustion unit 110 formed as described above.

The ignition unit 120 includes a blocking plate 122 and a burner crater 126 mounted on one end surface of the combustion furnace 112. The blocking plate 122 is mounted on one end surface of the combustion furnace 112 and extends radially outward of the combustion furnace 112 so that external air is not directly transmitted to the combustion furnace 112. At this time, the first auxiliary blocking plate 124a and the second auxiliary blocking plate 124b extending to the outside of the blocking plate 122 are integrally extended to the upper and lower portions of the blocking plate 122. On the other hand, the burner crater 126 has a cylindrical shape with both ends open, while the other end is disposed to penetrate one end of the blocking plate 122 and the combustion furnace 112. That is, the burner crater 126 communicates with the interior of the combustion furnace 112. One end of the burner crater 126 is integrally mounted with an annular burner fixing connecting plate 130 so that a conventional burner 128 may be screwed. The upper exhaust part 140 and the lower exhaust part 160 are mounted to the combustion part 110 in which the ignition part 120 is mounted.

The upper exhaust part 140 includes an upper exhaust pipe 142 and a dust catching plate 144. The upper exhaust pipe 142 has an open shape at one end and a lower part thereof and is horizontally fixed to the radially upper portion of the combustion furnace 112. At this time, the upper exhaust pipe 142 extends to one end side of the combustion furnace 112 while defining the first combustion hole 116a. Preferably, the upper exhaust pipe 142 defines the ignition hole 114 together with the first combustion hole 116a. That is, the inside of the upper exhaust pipe 142 communicates with the inside of the combustion furnace 112 by the first combustion hole 116a. Preferably, the upper portion of the upper exhaust pipe 142 has a length smaller than the length of the first auxiliary blocking plate 124a while having a “∧” shape. On the other hand, the dust catching plate 144 is disposed on the upper portion of the upper exhaust pipe 142 to prevent the foreign matter and dust caught in the dry grains to fall directly to the combustion furnace 112 side. Like the upper portion of the upper exhaust pipe 142, the dust catching plate 144 has a “∧” shape and a plurality of reinforcing plates 146 vertically disposed at predetermined intervals are fixed on the lower surface. At this time, the fixing plate 148 which allows the dust catching plate 144 to be spaced apart from the upper exhaust pipe 142 extends vertically on both bottom surfaces of the dust catching plate 144, respectively, so that both ends of the upper exhaust pipe 142 are provided on both sides of the first exhaust pipe 142. Are coupled by screws 150.

On the other hand, the lower exhaust 160 has a lower exhaust pipe 162 and the pedestal 164. The lower exhaust pipe 162 has an open shape at one end and an upper part thereof and is fixedly disposed horizontally at a radially lower portion of the combustion furnace 112. At this time, the lower exhaust pipe 162 extends to one end side of the combustion furnace 112 while defining the second combustion hole 116b. That is, the inside of the lower exhaust pipe 162 is in communication with the inside of the combustion furnace 112 by the second combustion hole 116b. Preferably, the lower portion of the lower exhaust pipe 162 has a length smaller than the length of the second auxiliary blocking plate 124b while having a “∨” shape. On the other hand, the pedestal 164 is fixed to both ends of the other end of the lower exhaust pipe 162 and a pair of vertical bars (166a, 166b) extending vertically downward, and a horizontal bar connecting the lower portion of the vertical bars (166a, 166b) 168. At this time, the upper portions of the vertical bars 166a and 166b are fixed to the lower exhaust pipe 162 by the second screws 170 and the horizontal bars 168 are the bottoms of the central hot air chamber 44 by the third screws 172. It is fixed on the face. The pedestal 164 as described above prevents the other end of the combustion furnace 112 from sagging to the bottom surface side of the central hot air chamber 44.

Hereinafter, the operating state of the radiator 100 of the circulating grain dryer formed as described above will be briefly described.

First, grains such as rice or barley, which are harvested in a rice field or a field such as a field and then transported to the grain dryer 10 using a transport device such as a tiller, are introduced into the grain dryer 10. After the grain is added, the grain dryer 10 is operated. As such, when the grain dryer 10 is operated, the transfer device 14 and the elevator 16 are sequentially operated, and as a result, the grain is transferred to the lower portion of the elevator 16 by the transfer device 14. After the grains are conveyed along the elevator 16 to the top of the grain dryer 10, the grains are conveyed to the upper end of the grain dryer 10 by the upper conveying device 18. At this time, the foreign matter contained in the grains are separated and discharged by the selection device 80, and then uniformly dispersed into the storage chamber 30 by the sterilizer 20 again.

As described above, when the grain is dispersed in the storage compartment 30, the burner 128 is activated. When the burner 128 is operated in this way, the combustion furnace 112 is heated by the burner 128, and as a result, far infrared rays are emitted from the ceramic paint 118 applied on the outer circumferential surface of the combustion furnace 112. The far infrared rays are irradiated to the grain layer formed in the central perforating network 32, the left and right perforating network 35 to dry the grain.

Meanwhile, the exhaust gas remaining after heating the combustion furnace 110 is guided to the upper exhaust pipe 142 and the lower exhaust pipe 162 through the first combustion hole 116a and the second combustion hole 116b, and discharged. Exhaust gas is a dry hot air together with the external air passes through the grain layer formed in the central perforating network 32 and the left and right perforating network 35 and is discharged to the outside by the blower (60). In this case, the blocking plate 122, the first auxiliary blocking plate 124a, and the second auxiliary blocking plate 124b prevent the mixed air containing the exhaust gas and the external air from remaining directly in the combustion furnace 112. On the other hand, the dust catching plate 144 prevents foreign matters and dust generated by the circulating grain from falling to the combustion furnace 112 side.

As described above, the radiator 100 of the recirculating grain dryer according to the present invention is disposed on the combustion unit 110, the upper and lower portions of the combustion unit 110 is mounted with the ignition unit 120, combustion unit 110 By providing the upper exhaust unit 140 and the lower exhaust unit 160 for guiding the exhaust gas of the exhaust gas, the exhaust gas remaining after combustion is discharged through the upper exhaust unit 140 and the lower exhaust unit 160 to dry the chamber 40. The internal temperature distribution can be uniform, and the ignition unit 120, the upper exhaust unit 140, and the lower exhaust unit 160 are integrally fixedly coupled to the combustion unit 110 to improve productivity, assembly, and maintenance. Not only is it smooth, it can maximize drying time and thermal efficiency, and it has the advantage of saving energy, increasing germination rate and reducing copper activity rate.

In addition, by applying the ceramic paint 118 on the outer peripheral surface of the combustion furnace 112 of the combustion unit 110, there is an advantage that the far infrared rays are released along with the drying heat to provide a grain with excellent taste.

On the other hand, by forming a dust catching plate 144 on the upper exhaust pipe 142 of the upper exhaust section 140, the foreign matter and dust falling from the circulating grains to fall to the combustion furnace 112 side to prevent the combustion furnace ( Not only can the ceramic paint 118 formed on the surface of 112 be always kept clean, but also there is an advantage of preventing the burning of foreign matter and dust.

In addition, the blocking plate 122, the first auxiliary blocking plate 124a, and the second auxiliary blocking plate 124b mounted on one end surface of the combustion furnace 112 may have external air combusting the 112 and the upper exhaust pipe ( 142, the direct exhaust pipe 162 may be prevented from directly contacting the combustion furnace 112, the upper exhaust pipe 142, and the lower exhaust pipe 162 may be prevented from being cooled.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims You will understand.

1 is an exploded perspective view showing the decomposition of the radiator of the circulation type grain dryer according to the invention,

Figure 2 is a perspective view showing a coupling state of the radiator shown in Figure 1,

3 is a cross-sectional view taken along the line A-A of FIG.

4a and 4b is a view showing a state in which the radiator according to the present invention is mounted in the circulation grain dryer,

5a is a front view of a recirculating grain dryer according to the prior art,

FIG. 5B is a right side view of the circulating grain dryer shown in FIG. 5A,

6A and 6B are internal structural diagrams of a circulating grain dryer according to the prior art, and

7 is a view showing a radiator according to the prior art.

Explanation of symbols on the main parts of the drawing

100: radiator 110 of the circulating grain dryer 110: combustion unit

112: combustion furnace 114: ignition

116a: first combustion hole 116b: second combustion hole

118: ceramic paint 120: ignition unit

122: blocking plate 124a: first auxiliary blocking plate

124b: Second Auxiliary Block 126: Burner Firewood

128: burner 140: upper exhaust

142: upper exhaust pipe 144: dust block

148: fixed plate 160: lower exhaust portion

162: lower exhaust pipe 164: pedestal

Claims (11)

A lower conveying device, a lifter, an upper conveying device, a sorting device and a fungus, a storage chamber for storing grains, and a drying chamber for drying grains by hot air; In the circulating grain dryer having a central hot air chamber in which the radiator is embedded, a central perforated network having a grain layer formed thereon, a rectangular perforated network and a left and right perforated net and a shutter drum for transferring the moisture-depleted grain to the bottom, The radiator; A combustion unit disposed horizontally in the central hot air chamber and having combustion furnaces in which upper and lower circumferential surfaces adjacent to the other end are formed with first and second combustion holes; A blocking plate which is mounted on one end of the combustion furnace to prevent external air from being directly transmitted to the combustion furnace, and has an open cylindrical shape at both ends while the other end penetrates the blocking plate and one end of the combustion furnace. An ignition unit having a burner crater that is disposed to communicate with an interior of the combustion furnace and has a burner mounted on one end thereof; An upper exhaust portion having an upper and lower ends and having an upper exhaust pipe fixedly disposed horizontally on a radially upper portion of the combustion furnace and extending to one side of the combustion furnace while defining the first combustion hole; And A lower exhaust portion having an open shape having one end and an upper portion horizontally fixed to a radially lower portion of the combustion furnace and having a lower exhaust pipe extending to one side of the combustion furnace while defining the second combustion hole; The radiator of the circulating grain dryer. The circulating grain dryer of claim 1, wherein the combustion furnace has a cylindrical shape in which both ends are closed, and a plurality of ignition holes are formed on the circumferential surface adjacent to one end of the combustion unit so that ignition can be performed smoothly. Emitter. 3. The radiator of claim 2, wherein the ignition hole is formed at a radially upper portion and a lower portion of the combustion furnace. The radiator according to claim 1, wherein a ceramic paint is applied on the outer circumferential surface of the combustion furnace so as to emit far infrared rays. The radiator of claim 4, wherein the ceramic paint is heat-cured in a drying furnace at 250 ° C. for 20 minutes while being sprayed so as not to flow on the outer circumferential surface of the combustion furnace. The method of claim 1, wherein the blocking plate extends radially outwardly of the combustion furnace, the first auxiliary blocking plate and the second auxiliary blocking plate extending to the outside of the blocking plate in the radially upper and lower portions of the blocking plate integrally. The emitter of the recirculating grain dryer, characterized in that extending. 7. The radiator of claim 6, wherein an upper portion of the upper exhaust pipe has a length of “∧” and a length smaller than that of the first auxiliary blocking plate. The radiator of claim 1, wherein a lower portion of the lower exhaust pipe has a “∨” shape and a length smaller than that of the second auxiliary blocking plate. The radiator of claim 1, wherein an annular burner fixing connecting plate is integrally mounted to one end of the burner crater so that the burner is screwed. According to claim 1, wherein the upper exhaust portion further comprises a dust catching plate disposed on the upper portion of the upper exhaust pipe to prevent foreign matter and dust caught in the drying grains to fall directly to the combustion furnace side; The dust catching plate has a “∧” shape at an upper portion thereof, and a plurality of reinforcing plates 146 disposed at predetermined intervals are fixed on a lower surface thereof, and the dust catching plate is disposed at an upper end of both ends of the dust catching plate. The radiator of the circulation grain dryer, characterized in that the fixing plate to be spaced apart from each other is vertically extended and coupled to both ends of the upper exhaust pipe by the first screw. The lower exhaust part is connected to a pair of vertical bars fixed to both sides of the other end of the lower exhaust pipe and extending vertically downward to prevent sagging of the other end of the combustion furnace, and a lower portion of the vertical bar. And a pedestal having a horizontal bar, wherein an upper portion of the vertical bar is fixed to the lower exhaust pipe by a second screw and the horizontal bar is fixed on a bottom surface of the central hot air chamber by a third screw. The radiator of the circulating grain dryer characterized by the above-mentioned.