JP2001116455A - Outer air temperature sensor for grain dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance detection accuracy of the outer air temperature sensor of a circulation grain dryer. SOLUTION: In a circulation grain dryer, an outer air inlet box 18 is disposed above a duct front 14 facing the hot air chamber 5 of a drying chamber 2, a burner 15 is disposed in the duct front 14 and a large number of slits 19, 19, ... are made in the upper surface 14a and the left/right side faces 14b, 14b of the duct front 14 so that outer air flows in through the slits 19, 19, ... An outer air temperature sensor 16 is disposed above the upper surface 14a of the duct front 14 at a part where the outer air passes toward the slits 19, 19, ...Since the effect of combustion heat from the burner 15 on the outer air temperature sensor 16 is reduced, temperature detection can be stabilized and since the outer air temperature sensor 16 can detects an extremely high temperature, failure of a suction fan for circulating drying air can also be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an arrangement position of an outside air temperature sensor of a grain dryer.

[0002]

2. Description of the Related Art In a conventional grain dryer, a duct front is arranged facing one end of a hot air chamber of a drying chamber, and a burner is arranged in the duct front. The configuration is such that a protector for preventing heating is provided, and an outside air temperature sensor is provided above the combustion portion of the burner.

[0003]

Since the outside air temperature sensor is provided as described above, the detection temperature of the outside air temperature sensor may differ depending on the amount of combustion of the burner and the amount of drying air, and the detection accuracy may be reduced. However, there was a problem that it was not stable.

[0004]

According to the first aspect of the present invention, there is provided a storage tank 1, a drying room 2, a grain collection room 3, and an elevator 4 for circulating and drying grains. In the cereal dryer, an outside air inflow box 18 is disposed above a duct front 14 opposed to one end of the hot air chamber 5 of the drying chamber 2.
A burner 15 is arranged in the inside, and a number of slits 19, 19, 19, 19,
Are provided to allow the outside air to flow in, and the slits 19, 1 above the upper surface portion 14a of the duct front 14 are provided.
9, the outside air temperature sensor 16 is arranged at a portion where the outside air flowing into the passage passes.

[0005]

In the grain dryer, a large number of slits 19, 19,... Are provided in the upper surface 14a of the duct front 14 to allow outside air to flow in, and the upper surface 14a of the duct front 14 is provided above the upper surface 14a. 14a slit 19, 1
9, outside air temperature sensor 1 at the location where outside air flows in
6, the influence of the combustion heat of the burner 15 can be reduced to stabilize the detected temperature. In addition, the detection of the extremely high temperature of the outside air temperature sensor 16 prevents the failure of the suction fan for circulating the dry air. Can also be detected.

[0006]

Embodiments of the present invention shown in the drawings will be described below. First, an overall configuration of a grain dryer will be described with reference to FIGS. 1 is an overall front view of the grain dryer, FIG. 2 is an overall side view, FIG. 3 is an overall cut front view, and FIG. 4 is an overall cut plan view.

The grain dryer includes a storage tank 1, a drying chamber 2,
The grain collecting room 3 is stacked to form a body of the machine, and an elevator 4 is provided upright on the side of the machine to dry while circulating grains.

In the drying chamber 2, a hot air chamber 5 composed of a net having a rhombic cross section is disposed at the center, and grain flow passages 6 and 6 are provided on both left and right sides of the hot air chamber 5 to allow the grain flow. Passages 6, 6
Exhaust chambers 7, 7 are arranged on both left and right sides of the air conditioner.

The hot air chamber 5 comprises a triangular upper hot air chamber section 5a and an inverted triangular lower hot air chamber section 5b, and a funnel-shaped upper grain is provided on both left and right sides of the upper hot air chamber section 5a. The grain downflow passages 6a, 6a are arranged, and the lower grain downflow passages 6b, 6b are arranged on both left and right sides of the lower hot air chamber 5b.

The grain collecting chamber 3 is provided with a grain collecting gutter 9 having a V-shaped cross section, and the lower ends of the lower grain flow passages 6b, 6b are provided at the lower ends thereof.
The delivery valve 10 is provided, and the grains delivered by the delivery valve 10 fall into the grain collecting gutter 9 and are collected at the bottom, and are conveyed to one side by the lower spiral 11. The cereal conveyed to one side is supplied to the lower part of an elevator 4 standing on the side of the fuselage, is fried by the elevator 4, and is further conveyed to the upper center of the storage tank 1 by the upper spiral 12;
It is configured to be uniformly spread over the storage tank 1 while being diffused by the diffusion device 8.

A duct front 14 is disposed at one end of the hot air chamber 5 so as to face the same, and a burner 15 is provided in the duct front 14 so as to face one end of the hot air chamber 5. A suction fan 13 is disposed at the other end of the hot air chamber 5 to communicate with one end of the exhaust chamber 7.

The outside air taken in from the front of the burner 15 by the suction force of the suction fan 13 is supplied to the burner 1.
The combustion heat of 5 causes hot air, and outside air is also taken in from a slit around the combustion portion of the burner 15 of the duct front 14, mixed, and introduced into the hot air chamber 5. Further, the hot air is guided to the grain flow passages 6 and 6 and the exhaust air chambers 7 and 7 to dry the grains, and is discharged from the exhaust air chambers 7 and 7 to the outside through the suction fan 13.

In the grain dryer, a control unit (not shown) having a built-in CPU includes a sticking / discharging switch 22, a drying switch 24, a stop switch 25 provided in the operation box 17, and adjusting the temperature of the drying air. Temperature setting switch 26,
Moisture setting switch 27 for adjusting the dry finish moisture of kernels
And various switch groups, such as a hot air temperature sensor, an outside air temperature sensor, an exhaust air temperature sensor, and various sensors such as a moisture meter are configured to be input via an input interface.
In addition, various actuators such as a suction fan motor, a burner air volume adjustment motor, a delivery valve motor, and an elevator motor are connected to the control unit via an output interface and a drive circuit.

Thus, control commands are issued to various actuator groups based on the input information of these various switch groups and sensor groups, and drying temperature control, drying speed control, grain temperature control, automatic combustion amount control, automatic moisture detection. Control such as stop control is performed, and safety control such as fuel stop control at the time of power failure, overload operation stop control, and abnormality display is performed.

Next, the mounting configuration of the outside air temperature sensor 16 will be described with reference to FIGS. A box-shaped duct front 14 is opposed to one end of the hot air chamber 5 of the drying chamber 2, and an operation box 17 equipped with a controller (not shown) is provided at an upper front portion of the duct front 14. The outside air inflow box 18 is arranged behind the operation box 17 and above the duct front 14, and the lower surface and the rear surface of the outside air inflow box 18 are open.

A burner 15 is arranged in the duct front 14 so as to face one end of the hot air chamber 5, and a plurality of slits 19 are formed in an upper surface portion 14a and left and right side portions 14b of the duct front 14. Are provided in the outside air inflow box 18 disposed above the slits 19 in the upper surface portion 14a.
A guide plate 20 for guiding to 9, 19,... Is provided.

Thus, the outside air is guided downward by the guide plate 20, and air flows into the combustion portion of the burner 15 through the slits 19 of the upper surface portion 14a.
Slits 19, 19, ... in the upper part of the wind inflow,
An outside air temperature sensor 16 is provided. A support plate 16a supports the outside air temperature sensor 16.

The outside air inflow box 18 also serves as a cover for a harness 17a connected to the operation box 17, and a harness 17a is placed on the upper surface of the guide plate 20.

In the conventional apparatus, the duct front 14
The burner 15 is disposed inside the burner 15, the protector 21 is provided in front of the burner 15, and the outside air temperature sensor 16 is provided above the burner 15. Accordingly, there is a problem that the temperature detected by the outside air temperature sensor 16 varies depending on the amount of combustion of the burner 15 and the amount of air flow.

However, as described above, the duct front 1
4 above the burner 15 and at the portion where the outside air flows through the slits 19, 19,.
Since the outside air temperature sensor 16 is disposed, the influence of the combustion heat of the burner 15 can be reduced, and the detected temperature can be stabilized by the inflowing outside air. Further, since the upper portion of the slits 19, 19,... Of the upper surface portion 14a of the duct front 14 is covered by the outside air inflow box 18, dust hardly accumulates and the fire by the burner 15 can be prevented. Further, the inside of the outside air inflow box 18 is divided into two parts by the guide plate 20 into a lower air introduction part and an upper air-impermeable part, so that the influence of the inflow outside air on the controller (not shown) in the operation box 17 is obtained. And the upper surface 1 of the duct front 14
.. Can be cleaned by the wind, dust stagnation can be prevented, and fire can be prevented.

Next, another embodiment of the operation control by the moisture meter will be described. In this embodiment, in the grain dryer, the filling / discharging switch 22 is turned on to start a circulation drying operation of the grain, and a moisture meter (not shown; for example, disposed in the elevator 4) during the operation. The moisture meter is supplied with the material dropped from the fried cereal grains, and is a well-known device for measuring the moisture content.) The moisture is measured and the moisture value is higher than the set moisture value of the dry finish by 3% or more. Is detected, it is determined that the insertion operation is being performed, the delivery valve 10 is stopped, and the operation shifts to the insertion operation for driving the lower spiral 11, the elevator 4, and the upper spiral 12. In addition, during the filling operation, the moisture measurement by the moisture meter (not shown) is repeated at predetermined intervals, and when the sample particles do not enter the moisture meter (not shown), it is determined that the filling operation is completed. The operation shifts to the ventilation operation in which the suction fan 13 is rotated with the burner 15 stopped. When the ventilation drying for a predetermined time is completed, the operation may be automatically shifted to the hot-air drying operation according to a command from a control unit (not shown).

In a conventional grain dryer, when the setting amount is set by operating the setting amount switch of the operation box,
When ventilation drying is automatically selected and then a drying switch is turned on, hot air drying is started.

However, in this embodiment, as described above,
Turning on the stuffing / discharging switch 22 starts the stuffing work, automatically determines the end of the stuffing work, and then automatically shifts to the ventilation operation, so that the stuffing work and the ventilation drying work can be performed efficiently. Can be done

At the end of the filling operation and the ventilation drying operation, the operator sets the filling amount, turns on the drying switch, or sets a filling amount sensor (not shown).
And automatically shifts to the drying operation.

Next, another embodiment of operation control by a moisture meter (not shown) will be described. In this embodiment, during the grain circulation drying operation of the grain dryer, the moisture value is measured at predetermined intervals by a moisture meter (not shown), and when the measured moisture value falls below the set moisture value, the discharging operation is performed. Is determined, the mode is shifted to a grain discharge mode for taking out grains outside the machine, and a moisture meter (not shown) measures moisture at predetermined time intervals even during the discharge mode operation. When it is determined that the moisture does not enter the grain and the moisture meter is abnormal, it is determined that the discharging operation is completed, and the discharging operation is automatically stopped.

In the conventional apparatus, a special paddy flow sensor for detecting that the grain is circulating is provided, and the presence / absence of the circulation of the grain is detected by ON / OFF of the paddy flow sensor. Was.

However, in the above embodiment, the circulating state of the grain can be detected by a moisture meter (not shown) without using a special sensor, and the end of the grain discharging operation can be determined. Thus, the discharging operation can be automatically stopped.

In this embodiment, a dust extractor 23 is provided on the upper spiral 12 of the circulating grain dryer to separate and discharge dust from the circulating grains.
The dust collector 23 is driven to discharge the dust, and the control is performed to stop the dust collector 23 when the grain is near the finish of drying.

In the conventional apparatus, during the drying operation, since the dust discharger 23 is constantly rotating, it is close to the finished drying, the grain density in the drying chamber 2 is increased, and the grain flowing down passage 6 , 6 are reduced, and the drying efficiency is reduced.

However, as described above, in the latter half of the drying operation, the dust collector 23 is stopped, so that the flow of the drying air to the dust collector 23 via the grain collection chamber 3 and the elevator 4 is stopped. ,
The grain can be dried efficiently.

Next, another embodiment of the combustion control of the burner 15 will be described. A flame eye (not shown) is installed near the combustion part of the burner 15, and the detection information is sent to a control unit (not shown).
It is for determining whether ignition has occurred or not, and for determining the combustion state of red-fire combustion or blue-fire combustion. Thus, when the combustion of red fire is determined, the burner 1 is controlled by a command from the control unit.
The number of rotations of the wind control fan (not shown) of No. 5 is adjusted to be higher than the standard, and the fan is rotated for several minutes (for example, 5 to 10 minutes) to prevent red fire combustion due to air mixing at the beginning of combustion. is there.

In the prior art, the ignition of the burner is determined by the frame rod.
The combustion state could not be determined. Also, for example, in the invention of Japanese Patent Application Laid-Open No. 5-71730, an increased amount of combustion air is supplied at the beginning of combustion of the burner in anticipation of a decrease in the amount of combustion air due to an increase in static pressure in the combustion chamber. , To prevent red fire burning. Therefore, there is a problem that the initial combustion is not stable because the amount of combustion air is increased regardless of red-fire combustion and blue-fire combustion.

However, in this embodiment, as described above,
Based on the detection of red or blue flame burning of the flame eye,
In the case of red-fire combustion, the amount of combustion air is increased, so that initial combustion can be stabilized while preventing red-fire combustion. FIG. 9 is a graph showing criteria for judging the red-eye combustion and the blue-fire combustion of the flame eye.

In order to prevent red-burning in the early stage of the burner combustion, when the operator discovers red-burning, the drying switch 24 of the operation box 17 is turned on again, and a command from a control unit (not shown) is issued. By rotating the air-conditioning fan (not shown) at a higher speed than normal for several minutes (for example, about 5 minutes), the red-fire combustion may be adjusted. In addition,
FIG. 10 shows a control flow.

[Brief description of the drawings]

FIG. 1 is an overall front view of a grain dryer.

FIG. 2 is an overall side view.

FIG. 3 is an overall cut front view.

FIG. 4 is an overall cut plan view.

FIG. 5 is a perspective view of a main part.

FIG. 6 is a side view of a main part.

FIG. 7 is a plan view of a main part.

FIG. 8 is an operation panel diagram.

FIG. 9 is a graph

FIG. 10 is a flowchart.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage tank 2 Drying room 3 Grain collection room 4 Elevator 5 Hot air room 6 Kernel down flow path 7 Exhaust room 8 Diffusion device 9 Grain collection gutter 10 Feeding valve 11 Lower spiral 12 Upper spiral 13 Suction fan 14 Front duct 15 Burner 16 Outside air Temperature sensor 17 Operation box 18 Outside air inflow box 19 Slit 20 Guide plate 21 Protector 22 Penetration / discharge switch 23 Dust exhaust 24 Drying switch 26 Temperature setting switch 27 Moisture setting switch

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 2B100 AA02 BB08 BC03 BC04 GA04 GA15 3L113 AC04 AC40 AC41 AC45 AC46 AC50 AC53 AC54 AC56 AC57 AC63 AC71 AC75 AC76 AC78 AC79 AC82 AC83 AC86 AC90 BA03 CA02 CA03 CA08 CB03 CB22 CB23 CB24 CB28 CB35 CB38 CB39 DA01 DA02 DA07 DA10 DA21

Claims (1)

[Claims] 1. A storage tank 1, a drying room 2, a grain collecting room 3,
In a grain dryer that includes an elevator 4 and circulates and dries grains, an outside air inflow box 18 is arranged above a duct front 14 that is opposed to one end of the hot air chamber 5 of the drying chamber 2, The burner 1 is installed in the duct front 14.
Are arranged at least in the upper surface portion 14a of the duct front 14 so that outside air flows in, and the slits 19, 19,... Above the upper surface portion 14a of the duct front 14 are provided. An outside air temperature sensor for a grain dryer, wherein an outside air temperature sensor 16 is disposed at a portion where outside air flowing into the cereal dryer passes.