JP5258377B2 - Grain drying equipment - Google Patents

Description

  The present invention relates to a grain drying apparatus that performs a drying process for drying grains.

In a grain drying apparatus, a technique is known in which a drying air temperature generated from a burner is set according to an amount of squeezed grain, an outside air temperature, or the like (see, for example, Patent Document 1).
JP-A-8-189769

  However, in the conventional techniques as described above, there is a concern that the drying rate of grains is not stable due to the influence of outside air humidity.

  In view of the above facts, an object of the present invention is to obtain a grain drying apparatus capable of drying grain at a stable drying rate while suppressing the influence of outside humidity.

The grain drying apparatus according to the invention of claim 1 is a drying unit that dries the supplied grain with hot air, and the temperature of the hot air is set to a standard hot air temperature set based on the amount of grain to be processed and the outside air temperature. And a control means for correcting when the outside air humidity is higher than the reference humidity and correcting when the outside air humidity is lower than the reference humidity, and the control means has a large difference between the outside humidity and the reference humidity. The hot air temperature correction amount with respect to the standard hot air temperature is increased, and the standard hot air temperature is greater when the amount of grain to be processed is smaller than when the amount of grain to be processed is large. When the amount of grain to be processed is small, the control means is a correction amount of the temperature of the hot air with respect to the standard hot air temperature when the amount of grain to be processed is large. And it is configured to be larger.

  In the grain drying apparatus according to claim 1, the grain supplied to the drying section is dried by hot air. When the outside air humidity substantially matches the reference humidity, the temperature of the hot air is set to a standard hot air temperature that is set based on (a relationship) between the outside air temperature and the amount of grain to be processed. The setting of the standard hot air temperature may be automatically performed by a control unit, for example, or may be manually performed by a driver of the apparatus. Thereby, in this grain drying apparatus, when the outside air humidity substantially matches the reference humidity, the grain can be dried at a stable drying rate (drying rate). The drying unit may be continuously supplied with grains, or may be configured to stay batchwise during drying, and may be circulated through a circulation path in which at least a part is the drying unit.

  Here, in this grain drying apparatus, when the outside air humidity (relative humidity) is higher than the reference humidity, the control means corrects the hot air temperature to a temperature higher than the standard hot air temperature at the reference humidity, so the influence of the outside air humidity. Thus, the decrease in the drying speed is suppressed, and the grain can be dried at a stable drying speed equivalent to that at the reference humidity. In addition, when the outside air humidity is lower than the reference humidity, the control means corrects the hot air temperature to a temperature lower than the standard hot air temperature at the reference humidity, so that an increase in the drying rate due to the influence of the outside air humidity is suppressed, Grains can be dried at a stable drying rate equivalent to that at the reference humidity.

  Thus, in the grain drying apparatus according to the first aspect, the grain can be dried at a stable drying rate while suppressing the influence of the outside air humidity.

Further, in the grain drying apparatus according to claim 1, the larger the difference (absolute value) of the outside air humidity with respect to the reference humidity, the larger the correction amount of the hot air temperature by the control means with respect to the standard hot air temperature. The influence can be suppressed more effectively. Thereby, in this grain drying apparatus, a grain can be dried at a more stable drying rate.

In the grain drying apparatus according to claim 1 , the standard hot air temperature is set relatively low when the amount of grain to be processed is relatively small. Thereby, when the outside air humidity substantially matches the reference humidity, the grain can be dried at a stable drying rate (drying rate).

  By the way, when the hot air temperature is relatively low, the drying speed is easily affected by the outside air humidity. Here, in the present grain drying apparatus, when the amount of grains to be processed is relatively small, the correction amount of the hot air temperature by the control means with respect to the standard hot air temperature is relatively large. The influence of the amount (that is, the influence of outside air humidity on the relatively low hot air temperature) can be suppressed. Thereby, in this grain drying apparatus, a grain can be dried at a more stable drying rate.

  As described above, the grain drying apparatus according to the present invention has an excellent effect that the grain can be dried at a stable drying rate while suppressing the influence of outside air humidity.

  The grain drying apparatus 10 which concerns on embodiment of this invention is demonstrated based on FIGS. Note that an arrow UP appropriately shown in each drawing indicates an upper side in the gravity direction that coincides with the vertical direction of the apparatus, an arrow FR indicates a front side in the longitudinal direction of the apparatus, and an arrow RH indicates a right side in the horizontal direction of the apparatus (width direction). Shall.

  FIG. 3 shows a front sectional view of the circulating grain drying apparatus 10 according to the embodiment of the present invention as seen from the front, and FIG. 4 shows the side of the grain drying apparatus 10 as seen from the left. It is shown in a sectional view. As shown in this figure, the grain drying apparatus 10 includes a machine body 12 as a main body of the machine, and the machine body 12 is formed in a substantially rectangular parallelepiped box shape that is vertically high and long in the front-rear direction.

  The upper part in the machine body 12 is a cereal tank 14 that constitutes a storage chamber, and grains K such as straw are stored (accommodated) in the accumulation state, for example. In addition, a drying unit 15 for drying the grain is disposed in the lower part of the machine body 12.

  The drying unit 15 is provided with a pair of exhaust path partition walls 16, and each exhaust path partition wall 16 has air permeability. Each exhaust passage partition 16 is bridged between the front plate 12A and the rear plate 12B (see FIG. 4) of the airframe 12 and is directed from the side plates 12C and 12D of the airframe 12 toward the center in the left-right direction of the airframe 12. Is inclined downward. Thereby, a pair of exhaust path partition 16 has comprised the substantially funnel shape by the front view as a whole.

  A wind tunnel plate 18 is provided inside the airframe 12 of the pair of exhaust passage bulkheads 16, and the wind tunnel plate 18 is formed of a breathable plate material in a substantially rhombic cylindrical shape in front view. It is configured. The wind tunnel plate 18 is bridged between the front plate 12 </ b> A and the rear plate 12 </ b> B of the airframe 12, and the interior of the wind tunnel plate 18 is a blower path 22. The front plate 12 </ b> A of the machine body 12 is formed with a rectangular outside air inlet 26 corresponding to the air passage 22, so that the outside air inlet 26 communicates with the air passage 22.

  Further, an air guide path partition 32 is provided between the upper part of the wind tunnel plate 18 and the upper part of each exhaust duct partition 16. Each of the air guide partition walls 32 is configured by being formed in a substantially rhombic cylindrical shape when viewed from the front by a plate material having air permeability. Due to this rhombus shape, the lower part of each air duct partition wall 32 is substantially parallel to each opposing exhaust channel partition wall 16 and substantially parallel to the opposing wind tunnel plate 18. Each air guide partition 32 is bridged between the front plate 12A and the rear plate 12B of the airframe 12, and the inside of each air guide partition 32 is an air guide 34.

  Further, the lower portion of the wind tunnel plate 18 is parallel to the respective exhaust passage partition walls 16 facing each other. As described above, in the drying unit 15 (lower part of the airframe 12), on the left and right sides of the wind tunnel plate 18, between the upper portion of the wind tunnel plate 18 and the wind guide partition wall 32, and the wind guide partition wall 32 and the exhaust air. A grain flow path 36 is formed between the lower part of the wind tunnel plate 18 and the lower part of the exhaust air path partition 16 via the upper part of the road partition 16. In these grain flow paths 36, the grain K stored in the grain tank 14 flows (flows).

  As shown in FIG. 3, a pair of tension flow plates 38 are provided below the pair of exhaust passage partition walls 16. Each stretch plate 38 is bridged between the front plate 12A and the rear plate 12B of the machine body 12. The pair of stretcher plates 38 are inclined downward from the side plates 12C and 12D of the airframe 12 toward the center in the left-right direction of the airframe 12, and have a substantially funnel shape as a whole when viewed from the front. . In addition, an air exhaust passage 40 is provided between each stretched flow plate 38 and each air exhaust passage partition 16.

  As shown in FIGS. 3 and 3, in the drying unit 15, a rectangular parallelepiped box-shaped furnace case 42 is provided on the left side portion of the front lower portion of the body 12. A plurality of slit-shaped outside air inlets 44 are formed in the front plate of the furnace case 42. Further, the furnace case 42 has its rear face plate partially opened so that the inside thereof communicates with the outside air inlet 26 described above. Further, the left side portion of the bottom plate of the furnace case 42 is open.

  Further, a rectangular box-like burner case 46 is provided on the left side immediately below the furnace case 42 in the lower front part of the body 12 constituting the drying unit 15. The upper surface plate of the burner case 46 is partially opened so as to communicate with the left open portion of the lower surface plate of the furnace case 42 described above. In the burner case 46, a burner 48 as hot air generating means is provided.

  On the other hand, a cuboid box-like blower mounting base 50 is provided at the lower rear portion of the airframe 12 constituting the drying unit 15. As shown in FIG. 3, the blower mounting base 50 communicates with the above-described exhaust passages 40 through openings 52 formed in the rear plate 12 </ b> B. A front end (suction side) of the blower 54 is attached to the rear surface of the blower mounting base 50, and one end of a flexible exhaust duct 56 is attached to the rear end (blowing side) of the blower 54. Yes.

  Thereby, in the drying unit 15, by driving the blower 54, normal temperature outside air (normal temperature air) is sucked into the air passage 22 from the outside air introduction port 44 through the furnace case 42 and the outside air inlet 26, Further, the air is sucked and blown into the blower 54 through the wind tunnel plate 18 (the vent hole), the respective grain downflow passages 36, the respective exhaust duct partition walls 16 (the vent holes), the respective exhaust passages 40 and the blower mounting base 50. And it is the structure exhausted through the exhaust duct 56. In addition, the outside air blown through the upper part of each grain flow path 36 passes through each air guide partition wall 32 and each air guide path 34.

  Then, the drying unit 15 of the grain drying apparatus 10 is configured so that the outside air introduced into the furnace case 42 from the outside air introduction port 44 is converted into hot air (dry air) heated to a higher temperature than the outside air by the burner 48. It is set as the structure by which the grain K in each grain flow path 36 is dried by sending air to the flow path 36.

  Between the lower ends of the grain flow paths 36, a cylindrical shutter drum 58 is provided as a feeding means constituting a flow means (moving means). As shown in FIG. 3, the shutter drum 58 substantially closes the lower end (merging portion) of each grain flow channel 36 and is spanned between the front plate 12 </ b> A and the rear plate 12 </ b> B of the machine body 12 to rotate around the axis. It is possible to rotate. As shown in FIG. 4, a pair of rectangular slits 60 that are elongated in the axial direction are formed on the outer periphery of the shutter drum 58, and one slit 60 is disposed on the front side of the outer periphery of the shutter drum 58. The other slit 60 is disposed on the rear side of the outer periphery of the shutter drum 58 and on the opposite side in the circumferential direction with respect to the one slit 60.

  Then, the shutter drum 58 rotates and each slit 60 faces (opens) the lower end of each grain flow path 36, so that the grain K in each grain flow path 36 flows into the shutter drum 58 via each slit 60. Further, when the shutter drum 58 is further rotated and the slits 60 are opened downward, the grain K flowing into the shutter drum 58 is discharged downward.

  Moreover, in the grain drying apparatus 10, the tension hopper 62 is each provided in the lower part of each side plate 12C, 12D of the body 12 so that opening and closing is possible. Thereby, in the grain drying apparatus 10, each grain hopper 62 is opened, so that the grain K can be tensioned (supplied) into the machine body 12. Here, the grain K discharged from the shutter drum 58 or the grain K stuck from the tension hopper 62 flows down between the lower ends of the tension flow plates 38.

  A lower screw conveyor 64 that constitutes a grain supply means is provided between the lower ends of the stretched flow plates 38. As shown in FIG. 4, the lower screw conveyor 64 has a rear end supported by the rear plate 12 </ b> B of the machine body 12 and a front end protruding forward of the front plate 12 </ b> A of the machine body 12. The lower screw conveyor 64 has a long bowl-shaped lower conveying bar 66, and the upper surface and the front surface of the lower conveying bar 66 outside the machine body 12 are closed.

  The lower conveyance rod 66 in the machine body 12 is communicated with the lower end portion of the air exhaust passage 40 in which the lower edge is formed by each of the stretcher flow plates 38 having a funnel shape. As a result, the grain K that has reached between the lower end portions of the tension flow plates 38 flows down into the lower conveying basket 66. In addition, a lower screw 68 is provided in the lower conveying basket 66, and the grain K that has flowed into the lower conveying basket 66 is conveyed forward by the lower screw 68.

  On the right side of the machine body 12, on the right side, an elevator (a masher) 70 constituting a grain supply means is erected, and the upper part of the elevator 70 protrudes upward from the upper surface plate 12 </ b> E of the machine body 12. An endless belt 72 is disposed in the elevator 70, and a plurality of buckets 74 are attached to the endless belt 72 at regular intervals. The lower end in the elevator 70 is communicated with the front end in the lower conveyance basket 66, and the grain K discharged from the lower screw conveyor 64 (the front end in the lower conveyance basket 66) and deposited on the lower end in the elevator 70 is an endless belt. In this configuration, the bucket 72 is lifted and conveyed by the bucket 74 to the upper end in the elevator 70.

  An upper screw conveyor 76 constituting a grain supply means is provided at the upper end of the machine body 12. The upper screw conveyor 76 has a rear end disposed immediately below the center (each center in the front-rear direction and the left-right direction) of the upper surface plate 12 </ b> E of the body 12, and the front end protrudes from the front plate 12 </ b> A of the body 12. The upper screw conveyor 76 has a long bowl-shaped upper conveying bar 78, and the lower surface of the rear end of the upper conveying bar 78 is open. The front end in the upper conveying basket 78 is communicated with the upper end in the elevator 70, and the grain K conveyed to the upper end in the elevator 70 flows down to the front end in the upper conveying basket 78.

  An upper screw 80 is provided in the upper conveying basket 78, and the grain K flowing down to the front end in the upper conveying basket 78 is conveyed backward by the upper screw 80. Further, the front end in the upper transport rod 78 can communicate with the discharge pipe 82, and when the front end in the upper transport rod 78 communicates with the discharge pipe 82, it flows down to the front end in the upper transport rod 78. The grain K is discharged from the grain drying apparatus 10 through the discharge pipe 82.

  Below the rear end of the upper screw conveyor 76, a leveler 84 that constitutes a flow means is rotatably provided, and the grain conveyed to the rear end of the upper screw conveyor 76 (the rear end in the upper conveying basket 78). As K flows down to the upper surface of the turntable 84C constituting the leveling machine 84, the K is evenly dispersed and distributed into the grain tank 14 by centrifugal force. Specifically, as shown in FIG. 4, the leveler 84 includes a gear box 84 </ b> A that converts rotation of the upper screw 80 around the axis along the longitudinal direction into rotation around the axis along the direction of gravity, A main part is a rotating shaft 84B that is driven to rotate about an axis along the direction of gravity by 84A, and a rotating disk 84C that is provided at the lower end of the rotating shaft 84B so as to rotate coaxially and integrally with the rotating shaft 84B. It is configured.

  The turntable 84C is formed in a dish shape that opens upward in the direction of gravity. Thereby, the leveling machine 84 rotates the rotating plate 84C around the rotating shaft 84B, and the grain K that has flowed down from the rear end of the upper screw conveyor 76 onto the rotating plate 84C by the centrifugal force as described above. It is configured to disperse and distribute evenly inside.

  Moreover, the grain drying apparatus 10 includes a tension amount detection unit 86 for detecting the amount of grain contained in the grain tank 14. The tension amount detection unit 86 includes a plurality of (five in this embodiment) level sensors 86A to 86E arranged at regular intervals along the direction of gravity on the inner surface of the front plate 12A of the machine body 12. Yes. Each of the level sensors 86A to 86E is, for example, a micro switch or the like, and receives a pressure from the grain K and outputs a predetermined signal (ON signal or the like). Thereby, the accommodation amount of the grain K in the grain tank 14 can be detected by the number of level sensors that output ON signals among the level sensors 86A to 86E. Among these level sensors 86A to 86E, the level sensor 86E positioned at the top is a full sensor as a grain detecting means for detecting the full capacity of the grain K in the machine body 12 (the grain tank 14). ing.

  A moisture measuring device 88 (moisture meter) is provided as detection means. The upper part in the moisture measuring device 88 communicates with the elevator 70. Thereby, when the grain K deposited on the lower end in the elevator 70 is beaten by the plurality of buckets 74, the grain K is moved into the moisture measuring device 88 by the splashing action of the bucket 74 to the grain K. It is automatically sampled (acquired) via the communication part. The moisture measuring device 88 is provided with a pair of electrode rolls (not shown) therein, and the sampled grain K is crushed between each pair of electrode rolls and the electricity between the pair of electrode rolls. By measuring the resistance value, the measured electrical resistance value is converted to the moisture value (moisture content) of the grain K, and the moisture value (average moisture value) of the grain K is measured (detected). .

  Furthermore, the grain drying apparatus 10 includes an operation panel 90 as a control means. In this embodiment, as shown in FIG. 4, the operation panel 90 is disposed on the upper side of the furnace case 42 in the lower front portion of the body 12. As shown in FIG. 5, the operation panel 90 includes a tension operation switch 91, a circulation operation switch 92, a drying operation switch 93, a discharge operation switch 94, a blower operation switch 95, a moisture setting dial 96, a stop switch 97, and the like. Various operation switches are provided. The operation panel 90 can control each of the burner 48, the blower 54, the shutter drum 58, the lower screw conveyor 64, the elevator 70, the upper screw conveyor 76, and the leveling machine 84. Thereby, the grain drying apparatus 10 is controlled (running, stopping, etc.) as described later by operating various operation switches of the operation panel 90.

  In the grain drying apparatus 10, the level sensors 86 </ b> A to 86 </ b> E of the tension amount detection unit 86 are electrically connected to the operation panel 90, respectively. The operation panel 90 is based on signals from the level sensors 86 </ b> A to 86 </ b> E. Thus, the amount of grain K (the height of tension in the grain tank 14) is detected.

  The operation panel 90 constituting the grain drying apparatus 10 is electrically connected to an outside air temperature sensor 98 that outputs a signal according to the outside air temperature and an outside air humidity sensor 99 that outputs a signal according to the relative humidity of the outside air. ing. Then, the operation panel 90 receives a signal from the overhang amount detection unit 86 (amount of grain K, that is, a grain amount to be processed), a signal from the outside air temperature sensor 98 (outside air temperature), and an outside air humidity sensor 99. Based on the signal (outside air humidity), the drying unit 15 is configured to control the temperature of hot air blown to each grain downflow path 36.

  In this embodiment, the operation panel 90 is configured to set the standard hot air temperature Ts based on the signal from the extension amount detection unit 86 and the signal from the outside air temperature sensor 98. Specifically, in the operation panel 90, a map of the standard hot air temperature Ts as shown in FIG. 2 is stored in the memory constituting the operation panel 90. From the overhang amount detection unit 86 and the outside air temperature sensor 98, Based on this signal, the standard hot air temperature Ts is selected from the map shown in FIG. The standard hot air temperature Ts shown in FIG. 2 is obtained when the relative humidity of the outside air substantially matches the reference humidity (RH 70% in this embodiment) in the relationship between the specific outside air temperature and the amount of tension. Is set as a hot air temperature for maintaining a drying speed (in this embodiment, a drying rate DR of approximately 0.8 [mass% / h], the same applies hereinafter) that does not cause cracking in rice wheat and the like. . The tension amount (kg) has the correlation shown in FIG. 2 with the tension height in the cereal tank 14 detected by the tension amount detection unit 86 (see the grain scales L to 5 in FIG. 2). .

  Further, the operation panel 90 obtains a corrected hot air temperature Ta obtained by correcting the standard hot air temperature Ts on the basis of a signal from the extension amount detection unit 86 and a signal from the outside air humidity sensor 99. Specifically, as illustrated in FIG. 1, the hot air temperature correction amount ΔT with respect to the amount of tension is stored in the memory constituting the operation panel 90 for each relative humidity. The operation panel 90 adds the hot air temperature correction amount ΔT set based on the amount of hot air and the outside air humidity to the standard hot air temperature Ts set based on the amount of hot air and the outside air temperature, thereby correcting the corrected hot air temperature. It is set as the structure which acquires Ta.

  In this embodiment, when the outside air humidity is higher than the reference humidity, the hot air temperature correction amount ΔT is positive, and the corrected hot air temperature Ta is set higher than the standard hot air temperature Ts. On the other hand, when the outside air humidity is higher than the reference humidity, the hot air temperature correction amount ΔT is negative, and the corrected hot air temperature Ta is set lower than the standard hot air temperature Ts. The operation panel 90 is configured to control the burner 48 (fuel, air supply amount, etc.) so that the hot air temperature in the drying unit 15 becomes the set standard hot air temperature Ts or the corrected hot air temperature Ta.

  In this embodiment, the absolute value of the hot air temperature correction amount ΔT increases as the difference (absolute value) in the outside air humidity with respect to the reference humidity greatly differs. Further, in this embodiment, the absolute value of the hot air temperature correction amount ΔT increases as the amount of application (kg) decreases.

  In the operation panel 90, when the relative humidity is a relative humidity not shown in the diagram of FIG. 1, the hot air temperature correction amount ΔT of the near relative humidity is used, or two diagrams sandwiching the relative humidity are used. The hot air temperature correction amount ΔT is obtained by linearly approximating the value. Further, when the outside air temperature is not shown in the map shown in FIG. 2, the operation panel 90 uses the standard hot air temperature Ts of the outside air temperature that is close or linearly approximates two values sandwiching the outside air temperature. Thus, the standard hot air temperature Ts is obtained.

  Next, the operation of the present embodiment will be described.

  In the grain drying apparatus 10 having the above configuration, when the tension operation switch 91 of the operation panel 90 is operated, the lower screw conveyor 64, the elevator 70, the upper screw conveyor 76, and the leveling machine 84 are driven to perform the tension operation. Then, the tension hopper 62 is opened, and the harvested grain K is tensioned into the body 12. The grain K stretched into the machine body 12 is guided to the lower screw conveyor 64 by the stretched flow plate 38, and passes from the lower screw conveyor 64 to the elevator 70, the upper screw conveyor 76, and the leveler 84, in the grain tank 14 and each It is conveyed (stored) to the grain flow path 36. This tension operation (grain K tension process) is automatically stopped by operating the stop switch 97 of the operation panel 90 or when a full signal is input from the full sensor 86E.

  For example, if it still takes time for the drying operation to be performed after the tension operation is finished, if the circulation operation switch 92 of the operation panel 90 is operated, the shutter drum 58, the lower screw conveyor 64, the elevator 70, the upper The screw conveyor 76 and the leveling machine 84 are driven and circulated (moved) (the grain K is circulated (moved)). Thereby, the grain K stored in the grain tank 14 is returned to the grain tank 14 via each grain flow path 36, the shutter drum 58, the lower screw conveyor 64, the elevator 70, the upper screw conveyor 76 and the leveling machine 84, Circulated in the grain drying apparatus 10. This circulation operation is stopped by operating the stop switch 97 of the operation panel 90.

  When the drying operation switch 93 of the operation panel 90 is operated, the shutter drum 58, the lower screw conveyor 64, the elevator 70, the upper screw conveyor 76, the leveling device 84, and the blower 54 are driven, and the burner 48 is ignited. Drying operation (drying process of grain K) is started. In the drying process of the grain K in the drying operation, the grain K is circulated in the grain drying apparatus 10 as in the case of the circulation operation.

  Furthermore, by driving the blower 54, hot air is generated by the burner 48 from the outside air sucked and introduced into the furnace case 42 from the outside air inlet 44, and this hot air is passed through the outside air inlet 26, the air passage 22 and the wind tunnel plate 18. Grain K is dried by sucking and blowing air to each grain flow path 36 and absorbing the moisture of the grain K in each grain flow path 36. The hot air after absorbing the moisture of the grain K is sucked and blown to the blower 54 through (passes through) each exhaust passage partition 16, each exhaust passage 40 and the blower mounting base 50, and further, the exhaust duct 56. It is exhausted through.

  Further, when the grain K accumulated at the lower end in the elevator 70 is beaten by the bucket 74, the grain K is sampled by a moisture measuring device (not shown) by the action of the bucket 74 jumping up on the grain K. Therefore, the moisture value of the grain K sampled into the moisture measuring device is measured by the moisture measuring device, and the moisture value of the grain K is displayed on the operation panel 90.

  The drying operation is automatically stopped when the stop switch 97 of the operation panel 90 is operated or when the grain K reaches the set moisture value set by the moisture setting dial 96. When the drying operation is stopped, the driving of the shutter drum 58 is stopped and the driving of the lower screw conveyor 64, the elevator 70, the upper screw conveyor 76, and the leveling machine 84 is continued as necessary. K is stored in the grain tank 14 and in each grain flow path 36.

  For example, when the drying operation is completed, when the discharge operation switch 94 of the operation panel 90 is operated, the shutter drum 58, the lower screw conveyor 64, the elevator 70, the upper screw conveyor 76, and the leveler 84 are driven, and the discharge operation is performed. Further, the front end in the upper conveying basket 78 is communicated with the discharge pipe 82, whereby the grain K is discharged from the grain drying apparatus 10 through the discharge pipe 82. Further, the discharging operation (the processing for discharging the grain K) is stopped by operating the stop switch 97 of the operation panel 90 or automatically when the grain K is completely discharged from the grain drying apparatus 10.

  For example, when a tension operation, a circulation operation, or a discharge operation is performed, when the air blowing operation switch 95 of the operation panel 90 is operated, the air blower 54 is driven and the air blowing operation is performed (the grain K is blown). As a result, the ambient temperature outside air sucked and introduced into the furnace case 42 from the outside air inlet 44 is sucked and blown to each grain flow path 36 via the outside air inlet 26, the air passage 22 and the wind tunnel plate 18, and each grain The air is blown to the grain K in the downstream channel 36. The outside air after being blown to the grain K in each grain flow path 36 is sucked and blown to the blower 54 through (passes through) each exhaust path partition wall 16, each exhaust path 40 and the blower mount 50. Further, the air is exhausted through the exhaust duct 56. As a result, the grain K is prevented from being steamed and dust is discharged from the grain K. Further, the air blowing operation is stopped by operating the stop switch 97 of the operation panel 90.

  Here, in the grain drying apparatus 10, since the hot air temperature at the time of drying operation is set to the standard hot air temperature Ts which is an appropriate temperature according to the amount of tension and the outside air temperature by the operation panel 90, the outside air humidity is the standard. When the humidity is close, the drying rate (drying rate) of the grain is kept at the drying rate DR that does not cause cracking of the grain regardless of the outside temperature or the amount of tension.

  In the grain drying device 10, the standard hot air temperature Ts is corrected based on the outside air humidity and the amount of tension, that is, the hot air temperature correction amount ΔT obtained based on the outside air humidity and the amount of tension is used as the standard hot air temperature Ts. In order to correct the standard hot air temperature Ts, the drying rate of the grain in the drying operation is maintained at the drying rate DR that does not cause cracking of the grain regardless of the outside air humidity.

  Specifically, in an environment where the drying rate of the grain K is likely to be reduced due to high outside air humidity, the corrected hot air temperature Ta higher than the standard hot air temperature Ts is set, so that the grain can be obtained even when the outside air humidity is high. The drying rate of K can be kept at the drying rate DR. On the other hand, when the outside air humidity is low by setting the corrected hot air temperature Ta lower than the standard hot air temperature Ts in an environment where the drying rate of the grain K is likely to increase (acceleration of drying) due to the low outside air humidity. Also, the drying rate of grain K can be kept at the drying rate DR.

  Furthermore, in the grain drying apparatus 10, since the hot air temperature correction amount ΔT is set to be larger as the amount of grain K inserted into the machine body 12 is smaller, the drying rate of grains in the drying operation is further improved. Kept in DR. More specifically, as shown in FIG. 2, in the operation panel 90, the standard hot air temperature Ts for maintaining the actual dryness rate at the dryness rate DR is the amount of extension when the outside air temperature is constant. The smaller the value, the lower the setting. On the other hand, when the hot air temperature is low, the drying rate is easily affected by the outside air humidity. For this reason, in the comparative example (example included in the present invention) where the hot air temperature correction amount ΔT when the amount of tension is relatively small and the hot air temperature correction amount ΔT when the amount of tension is large are set equal. There is a concern that the drying rate may deviate from the drying rate DR when the amount of tension is small.

  On the other hand, in the grain drying apparatus 10, since the hot air temperature correction amount ΔT is set to be larger as the amount of grain K inserted into the machine body 12 is smaller as described above, the drying rate of grains in the drying operation is standard. The effect of setting the hot air temperature Ts to be low (the effect of the amount of tension) is eliminated, and the dryness reduction rate DR is maintained well.

  In the above-described embodiment, the operation panel 90 selects the standard hot air temperature Ts from the map shown in FIG. 2, and the hot air temperature correction amount ΔT is obtained from the diagram shown in FIG. For example, the standard hot air temperature Ts and the hot air temperature correction amount ΔT may be calculated by calculation.

  In the above-described embodiment, an example has been shown in which, after setting the standard hot air temperature Ts, the hot air temperature correction amount ΔT is added to the standard hot air temperature Ts to obtain the corrected hot air temperature Ta, but the present invention is limited to this. For example, the corrected hot air temperature Ta may be obtained without going through the setting of the standard hot air temperature Ts. That is, for example, the standard temperature addition amount to be added to the outside air temperature obtained based on the outside air temperature and the amount of tension and the hot air temperature correction amount ΔT obtained based on the outside air humidity and the amount of tension are simultaneously converted into the outside air temperature. By adding, it can be set as the structure which calculates | requires correction | amendment hot air temperature Ta.

  Furthermore, in the above-described embodiment, an example in which the standard hot air temperature Ts is set by the operation panel 90 has been shown. However, the present invention is not limited to this, and for example, the standard hot air temperature Ts is shown in the map (management table) shown in FIG. ) May be set manually (by operating the operation panel 90) by the operator of the grain drying apparatus 10.

It is a diagram which shows the correction amount of the hot air temperature for every relative humidity by the operation panel which comprises the grain drying apparatus which concerns on embodiment of this invention. It is a schematic diagram which shows the map for setting the hot air temperature in reference | standard humidity by the operation panel which comprises the grain drying apparatus which concerns on embodiment of this invention. It is front sectional drawing of the grain drying apparatus which concerns on embodiment of this invention. It is a sectional side view of the grain drying apparatus which concerns on embodiment of this invention. It is a block diagram which shows the electrical connection with the operation panel which comprises the grain drying apparatus which concerns on embodiment of this invention, various input elements, and an output element.

Explanation of symbols

10 Grain dryer 15 Dryer 90 Operation panel (control means)

Claims (1)

A drying section for drying the supplied grains with hot air,
When the outside air humidity is lower than the reference humidity, the hot air temperature is corrected to be higher when the outside air humidity exceeds the reference humidity with respect to the standard hot air temperature set based on the amount of grain to be processed and the outside air temperature. Control means to correct low,
Equipped with a,
The control means is configured to increase the amount of correction of the temperature of the hot air with respect to the standard hot air temperature as the difference in the outside air humidity with respect to the reference humidity increases.
Further, the standard hot air temperature is set lower when the amount of grain to be processed is small than when the amount of grain to be processed is large,
The grain drying device , wherein the control means is configured such that when the amount of grain to be processed is small, the correction amount of the temperature of the hot air with respect to the standard hot air temperature is larger than when the amount of grain to be processed is large .

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