JP2006308244A - Circulating grain dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circulating grain dryer taking a dew condensation countermeasure method needing no cleaning work. <P>SOLUTION: An outside surface 10a constituting an exhaust drum 9 in the circulating grain dryer 1 is provided with an outside air lead-in port 17 disposed along the longitudinal direction of the exhaust drum 9, in a position above the inclined upper end of a funnel-shaped bottom plate 11. Consequently, even if dew is formed on the inner surface of the outside surface 10a constituting one side face of the exhaust drum 9, and flows down along the inner surface of the outside surface 10a, the dew is blown away by a blast of outside air sucked from the outside air lead-in port and discharged to the outside together with exhaust air. The dew does not therefore fall on the bottom plate 11 at a take-out part 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a circulation type grain dryer having a countermeasure against condensation.

Conventionally, a circulation type grain dryer has a main body part in which a storage tank part, a hot-air drying part and a grain take-out part are superposed in order from the top, and a reflux for returning the grain taken out from the grain take-out part to the storage tank part. It is comprised from an apparatus (an elevator and an upper conveyance machine). The hot air drying unit has a hot wind tunnel provided horizontally at the center in the width direction of the main body, and a grain downflow layer and an exhaust wind drum are provided horizontally on both sides of the hot wind drum. The hot wind tunnel is connected to a hot air generator disposed on one side (front side) of the main body so as to be supplied with hot air. The exhaust duct communicates with an exhaust box and an exhaust fan disposed on the other side (rear side) of the main body, and serves as a passage for exhausting the exhaust air that has passed through the grain lower layer to the outside of the machine. It has become. The machine wall forming one side surface of the exhaust wind tunnel is provided with an opening / closing door for grain filling, and the raw material grain is introduced by opening the opening / closing door and stored in the storage tank portion by the reflux device. Then, by controlling the drying operation by the control device, the inside of the main body is circulated until the moisture value of the grain reaches a predetermined value while receiving hot air when flowing down the grain lower layer. In the drying operation, the exhausted air that passes between the grains in the grain lower layer reaches the exhaust drum, and then passes through the exhaust box and is exhausted from the exhaust fan to the outside of the machine.

By the way, in the conventional circulation type grain dryer, when the high moisture grain is dried when the outside air temperature is low, the exhaust wind drum has a temperature difference between the outside air temperature and the exhaust air (high humidity) temperature. Dew may form on the inner surface of the machine wall forming one side surface (hereinafter referred to as “side machine wall”). When dew is generated on the side machine wall, the dew flows down on the side machine wall, falls on the cereal collecting plate (funnel-shaped bottom plate) of the grain take-out part, and further flows down on the cereal collecting plate surface to be refluxed. There arises a problem of adhering to the grain and a problem of adhering / depositing impurities on the surface of the cereal collection plate wet by dew. As a countermeasure method for such a problem due to condensation, there is one disclosed in Patent Document 1. In the countermeasure method of this Patent Document 1, in order to catch the dew that flows down the side wall of the side machine at the lower part of the side machine wall, a kite extending in the longitudinal direction of the wind tunnel is formed. A hose for draining outside the machine is connected to one end of the pipe, and the dew received in the gutter is drained outside the machine from the hose.

Japanese Utility Model Publication No.59-110893

However, the means of Patent Document 1 has the following problems. That is, it is needless to say that dust, straw, thinner, and other dust generated when the grain flows down (falls) from the grain lower layer to the grain take-out portion are passed through the exhaust wind. Therefore, dust gradually accumulates in the soot while absorbing moisture of dew accumulated in the soot. For this reason, it is necessary to remove the dust collected in the basket before and after the grain harvest time or during the season when the amount of garbage contained in the raw material is large.
In view of these problems, it is a technical object of the present invention to provide a circulation type grain dryer having a dew condensation countermeasure method that does not require cleaning work.

In order to solve the above problem, according to claim 1,
A storage tank for storing grain,
The grain flow layer and the exhaust wind tunnel are sequentially installed on both sides of the horizontal hot wind tunnel, a hot air generator is connected to one end of the hot wind tunnel, and a wind exhaust fan is connected to one end of the exhaust wind tunnel. A hot air drying section for passing hot air through the grains flowing down the grain flow layer;
A take-out part having a funnel-shaped bottom plate and taking out the grain of the hot air drying part from the machine;
A reflux part for returning the grain taken out from the take-out part to the storage tank;
In the circulation type grain dryer provided with the control part which performs drive control of the hot air drying part, the extraction part, the reflux part, etc.,
A technical means is provided in which an outside air inlet that is disposed along the longitudinal direction of the exhaust wind tunnel is provided on the outer surface constituting the exhaust wind tunnel at a position above the inclined upper end of the bottom plate.

  According to this, even if dew is generated on the outer surface constituting one side surface of the exhaust drum, and the dew flows down along the inner surface of the outer surface, the dew is sucked from the outside air inlet. After being blown away by (outside air), it is discharged from the machine together with the exhaust air, so it does not flow down to the bottom plate at the take-out part. In addition, since the exhaust air is mixed with the jet, the temperature difference from the outside air is reduced.

  According to a second aspect of the present invention, technical means is provided in which the outside air inlet is formed at the lower end of the outer side surface. According to this, the dew generated and flowing down above the lower end portion of the outer surface can be blown off by the blast from the outside air inlet formed only at the lower end portion.

According to a third aspect of the present invention, technical means is provided in which the outside air introduction port is configured by a slit hole. According to this, since a sharp blast is made from the slit hole, the dew is surely blown off.

According to the present invention, even if dew is generated on the inner surface of the outer surface that constitutes one side surface of the exhaust wind tunnel and the dew flows down along the outer surface, the dew is blown off by the blast from the outside air inlet. Since the air is exhausted together with the exhaust air, it does not flow down to the bottom plate at the take-out part, and the bottom plate gets wet and dust does not adhere to and accumulate on the bottom plate. Therefore, according to the present invention, since no spear is provided as in the prior art, no cleaning work is required, and an anti-condensation measure is taken with a simple configuration in which an outside air inlet is formed on the outer surface. Further, according to the present invention, since the exhaust air is mixed with the blast, the temperature difference from the outside air is reduced, so that the amount of dew generated on the outer surface itself is also reduced.

  FIG. 1 is a front perspective view of a circulating grain dryer 1 of the present invention, and FIG. 2 is a rear perspective view. FIG. 3 shows a front longitudinal sectional view of the circulation type grain dryer 1. The circulation type grain dryer 1 includes a storage tank 2 for storing grains, a hot air drying section 3 for blowing hot air to dry the grains, and a take-out section 4 for taking the grains out of the machine. 1a, a reflux part 5 for returning the grain taken out from the take-out part 4 to the storage tank 2, and a control part 6 for controlling a drive motor and the like. The storage tank 2 is constituted by a machine wall 2a and a ceiling plate 2b.

The hot-air drying unit 3 has a hot-air drum 7 that is laterally arranged in the longitudinal direction of the main body 1a and is surrounded by a rear machine wall 10c and a partition wall 7a disposed on one side of the main body 1a (see FIG. 4). One side of the hot air drum 7 communicates with the hot air generator 7b through the opening so that hot air is supplied. On both sides of the hot wind tunnel 7 in the longitudinal direction, a grain lowering layer 8 between the partition wall 7a and the opposing partition wall 8a is laterally arranged, and further to the side of the grain downstream layer 8 is an exhaust air. The body 9 is set sideways. Each of the partition wall 7a and the partition wall 8a is provided with a porous portion for passing hot air through the grain flowing down the grain lower layer 8. The air exhaust drum 9 includes the partition wall 8a, a side machine wall (outer surface) 10a disposed on the side of the main body 1a, a front machine wall 10b disposed in front of the main body 1a, and the rear machine wall 10c. And it surrounds and is formed by the funnel-shaped bottom plate 11 mentioned later. An opening 9 a is formed in the rear machine wall 10 c of the wind exhaust drum 9, and the opening 9 a is communicated with the exhaust fan 13 through the exhaust box 12.

  The side machine wall (outer surface) 10a is constituted by a rectangular plate having an edge 14 standing on the peripheral edge (see FIGS. 5 and 6). Reference numeral 15 shown in FIG. 5 is a reinforcing portion. In the main body 1a, the side machine wall 10a on one side is shorter in length than the side machine wall 10a on the other side because the tensioning door 16 is also disposed at the mounting position (see FIG. 6). . Although it is the characteristic structure of this invention, the external air inlet 17 is arrange | positioned along the longitudinal direction in the lower part of the said side machine wall 10a. The outside air introduction port 17 is configured by arranging slit-like holes 18 at regular intervals. The slit holes 18 are, for example, 11 mm long and 3 mm high, and are arranged at intervals of 75 mm. The shape of the outside air introduction port 17 may be any shape as long as an outside air ventilation (fountain) for blowing off dew flowing down the side machine wall 10a surface can be obtained. For example, the outside air introduction port 17 may have a round shape or a slit hole. Instead of being linear, they may be arranged on a staggered pattern or arranged in two rows. However, the number or area of the outside air introduction ports 17 needs to be set to such an extent that the drying efficiency (capacity) of the grains is not lowered.

The take-out portion 4 has the funnel-shaped bottom plate 11 having its upper end connected to the vicinity of the lower end of each side machine wall 10a and the other side inclined downward toward the center of the main body 1a, The lower plate 11 has a lower transfer machine 11 a provided horizontally at the lower center of the bottom plate 11. Further, a feeding valve 19 disposed at the lower end position of the grain flow lower layer 8 is also included. The transfer terminal side of the lower transfer machine 11a is connected to the transfer start end side of the elevator 5a constituting the reflux section 5, and the transfer terminal side of the elevator 5a is the upper transfer machine 5b installed horizontally on the upper part of the storage tank 2. Connect to the conveyance start side. The transfer terminal side of the upper transfer machine 5 b faces the storage tank 2.

The control unit 6 includes a motor drive control circuit such as the feeding valve 19 and the elevator 5a, a burner control circuit of the hot air generator 7b, a setting unit such as a finishing moisture value, various operation buttons, and the like. Yes. The burner control circuit or the like controls the drying speed based on the measured moisture value from a grain moisture meter (not shown) provided in the elevator 5a.

  Hereinafter, the operation of the circulation type grain dryer 1 in the present invention will be described. When the operator selects the extension operation button of the controller 6, the elevator 5a, the upper conveyor 5b and the lower conveyor 11a are driven by the motor drive control circuit of the controller 6. After that, when the tensioning door 16 is opened and the raw material grains are tensioned, the grains are supplied and accumulated in the storage tank 2 through the lower conveyor 11a, the elevator 5a and the upper conveyor 5b. When there are no more raw material grains to be stuck, the stop button is pushed, and the driving of the elevator 5a, the upper transporter 5b and the lower transporter 11a is stopped.

When the operator sets the dry finish moisture value and selects a drying operation button after the end of the tensioning operation, the elevator 5a, the upper conveyor 5b, the lower conveyor 11a, the feeding valve 19, the exhaust fan 13, and the The hot air generator 7b is driven. The hot air generated by the hot air generating device 7b is sucked into the hot air drum 7 by the suction action of the exhaust fan 13, and then passes through the grain downflow layer 8, the exhaust air drum 9, and the exhaust air box 12, and the exhaust air Exhaust air is exhausted from the fan 13 as exhaust air. Grains in the storage tank 2 are subjected to the flow of the hot air in the grain lower layer 8, and then are fed out from the feed valve 19 and returned to the storage tank 2 by the reflux unit 5. The drying operation is automatically terminated (stopped) when the grain moisture value measured by the grain moisture meter reaches the dry finish moisture value.

  The characteristic operation of the present invention will be described. During the drying operation, when the outside air temperature is low and the moisture value of the grain being dried is high, the exhausted air that has been humidified when passing through the grain lower layer 8 passes through the wind tunnel 9, so that the outside air Dew is generated on the inner surface of each side machine wall (outer surface) 10a. The dew flows down along the inner surface of each side machine wall 10a and reaches the outside air inlet 17 (slit hole 18) (see FIG. 7). At this time, outside air is sucked from the slit hole 18 by the suction action of the exhaust fan 13, and a blast directed toward the exhaust cylinder 9 is generated. Due to the blast, the dew that reaches the slit hole 18 is blown off and exhausted along with the exhaust air, so that the dew that flows down does not fall on the funnel-shaped bottom plate 11. For this reason, it does not flow down the surface of the funnel-shaped bottom plate 11 and adhere to the grains conveyed in the lower conveyor 11a. In addition, since the exhaust air is mixed with the jet, the temperature of the exhaust air decreases, and the temperature difference from the outside air becomes small. For this reason, there is an effect of reducing the amount of dew generated on the inner surface of each side machine wall 10a.

  In the above description, the outside air introduction port 17 is formed only in each side machine wall 10a. However, the present invention is not limited to this, and the outside air introduction port 17 is formed in the front machine wall 10b in each tensioning door 16 or each exhaust wind tunnel 9. May be. Further, the outside air introduction port 17 may be formed not only at the lower end portion of each side machine wall 10a but also at an intermediate position in the vertical direction of each side machine wall 10a.

Front perspective view of circulating grain dryer in the present invention Rear perspective view of the dryer Front longitudinal section of the dryer Sectional view of AA in FIG. Perspective view of side machine wall Perspective view of the side machine wall on the other side The principal part enlarged view which showed the effect | action of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circulation-type grain dryer 1a Main-body part 2 Storage tank 2a Machine wall 2b Ceiling board 3 Hot-air drying part 4 Extraction part 5 Reflux part 5a Elevator 5b Upper conveyance machine 6 Control part 7 Hot-air drum 7a Bulkhead 7b Hot-air generator 8 Grain lower layer 8a Bulkhead 9 Exhaust drum 9a Opening 10a Side machine wall (outer side)
10b Front machine wall 10c Rear machine wall 11 Funnel-shaped bottom plate 11a Lower conveyor 12 Exhaust box 13 Exhaust fan 14 Edge 15 Reinforcement part 16 Tightening door 17 Outside air introduction port 18 Slit hole 19 Feed valve

Claims (3)

A storage tank for storing grain,
The grain flow layer and the exhaust wind tunnel are sequentially installed on both sides of the horizontal hot wind tunnel, a hot air generator is connected to one end of the hot wind tunnel, and a wind exhaust fan is connected to one end of the exhaust wind tunnel. A hot air drying section for passing hot air through the grains flowing down the grain flow layer;
A take-out part having a funnel-shaped bottom plate and taking out the grain of the hot air drying part from the machine;
A reflux part for returning the grain taken out from the take-out part to the storage tank;
In the circulation type grain dryer provided with the control part which performs drive control of the hot air drying part, the extraction part, the reflux part, etc.,
Circulating grain drying characterized in that the outer surface of the exhaust wind tunnel is provided with an outside air inlet disposed along the longitudinal direction of the exhaust wind tunnel at a position above the inclined upper end of the bottom plate. Machine.   The circulating grain dryer according to claim 1, wherein the outside air inlet is formed at a lower end portion of the outer side surface. 3. The circulation type grain dryer according to claim 1, wherein the outside air inlet is configured by a slit hole.

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