JPH0771876A - Dry air volume abnormality detection device in grain dryer - Google Patents

Abstract

(57) [Summary] [Purpose] Stable detection of the dry air flow immediately after the start of drying to eliminate the risk of fire. [Arrangement] An air volume sensor 29 for detecting the suction air volume of the grain dryer and detecting an air volume insufficiency abnormality when the suction air volume is less than a predetermined value is provided, and when the suction fan 12 for generating the suction air is started, the air volume for a predetermined time T Although the sensor 29 is configured not to detect the air volume shortage abnormality, the control unit releases the detection restriction of the air volume reduction abnormality by the air volume sensor 29 after the ignition of the burner 10 is determined once, even within the above-mentioned certain time. And a drying air volume detection device in the grain dryer that comprises
After the ignition is determined, the regular air volume determination is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry air flow rate detecting device in a grain dryer.

[0002]

2. Description of the Related Art In a conventional grain dryer, a detection sensor for detecting the suction air volume or air pressure of a suction fan installed at the back of a drying chamber is provided in the middle of the suction air passage to obtain an appropriate air volume. The form is used to determine whether or not the wind pressure is secured, that is, whether or not the air volume is insufficient. When a constant air volume or pressure cannot be obtained, the operating parts are stopped so that the quality of grain is not affected.

Even when the suction fan motor is turned on at the start of drying, it takes a certain amount of time to reach a certain amount of air flow. Therefore, at the beginning of drying, it is determined that the detection sensor is off for a certain period of time (determination of insufficient amount of air flow). ) Is not performed. However, if the air volume stabilizes and the ignition occurs within this fixed time, there is a problem because the OFF judgment cannot be made until the fixed time has elapsed (Fig.).

[0004]

The present invention has been made in order to solve the above-mentioned drawbacks, and has taken the following technical means. That is, the air volume sensor 29 for detecting the suction air volume of the grain dryer and detecting the air volume insufficiency abnormality when the suction air volume is below a predetermined level.
Is provided to prevent the air volume sensor 29 from detecting the air volume shortage abnormality for a certain time T when the suction fan 12 that generates the suction air is started. However, once the burner 10 is determined to be ignited, the above is performed. The drying air volume detection device is configured in the grain dryer that constitutes a control unit that releases the restriction on the detection of the air volume reduction abnormality by the air volume sensor 29 even within a certain time.

[0005]

As described above, when the suction fan is started, it is not the target of the air volume shortage determination for the fixed time T, but once the ignition signal is obtained, the suction fan 12 is immediately after that.
Even if a certain amount of air cannot be ensured due to an abnormality, a break in the duct, or the like, the configuration is such that the OFF determination is made due to a decrease in the amount of air, so that the drawbacks described at the beginning can be solved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a machine frame of a grain drying device, in which a storage tank 2, a drying chamber 3, and a grain collecting chamber 4 are stacked in this order. A pair of left and right hot air chambers 5 and 5 having a rhombic cross section are provided in the drying chamber 3.
In order to form the above, the upper half portion is formed by the V-shaped sheet metal members 6 and 6, and the lower half portion is formed by the breathable plate members 7 and 7. Among these, the air-permeable plate members 7, 9 are fixed by sandwiching the grain flow-down passages 8, 8 in parallel with the air-permeable plate members 7, 7 in the lower half.

The hot air chambers 5 and 5 are constructed so that hot air generated by combustion of the burner 10 described later and a suction fan 12 connected to the rear side of the exhaust air chambers 11, 11, 11 is introduced. In addition, in the grain collection chamber 4, feeding valves 13 and 13 are provided at the lower portions of the V-shaped grain flow passages 8 and 8, respectively.
Is provided, and a predetermined amount of each fed grain from this feeding valve can be collected in a hopper-shaped grain collecting gutter 14 and can be transferred to an elevator 16 installed outside the machine by a lower transfer spiral 15 that is horizontally installed in the lower part thereof. is there.

A discharging cylinder 17 is connected to the upper side of the elevator 16 so that grain can be supplied to the starting end side of an upper transfer spiral 18 gutter 19 provided laterally on the ceiling of the storage tank 2. 20 is a transfer spiral gutter 1
It is a diffuser that receives the grain transferred at 9 at the central upper position of the storage tank 2 and diffuses it while rotating around the vertical axis 21. This diffuser 20 has a rectangular shape in a plan view, and the standing walls 20a, 2 are provided so as to have an appropriate grain discharge space in the four corners.
0a ... Is formed respectively, and the grain is discharged from the space portion in the rotational tangential direction. The vertical axis 21 is the spiral 18
The shaft is provided so as to be rotatable and interlocked at a predetermined rotation speed via a linkage mechanism such as a bevel gear.

Regarding the installation structure of the burner 10, the burner 10 employs a rotary vaporization type burner having a built-in vaporization cylinder, combustion primary air blower fan, etc., and is placed in a horizontal position to one side of the grain collecting trough 14. It is housed in a triangular space formed on the back surface. The flame is installed so that it faces the front of the machine casing. A hot air passage port 4b is opened in the grain collection chamber machine wall 4a on the front side of the burner 10, a lower wind tunnel 22 is opened in front of the burner chamber machine wall 4a, and a drying chamber machine wall opening is formed above the hot air chambers 5 and 5 inlets. Three
Upper wind tunnels 23 are detachably provided on the front surfaces of a and 3b. Slit holes 24, 24 for introducing outside air are provided in the lower wind tunnel 21.
Also, a stainless steel reflection plate 25 is fixed. The combustion flame of the burner 10 becomes a drying air by the rotation of the suction fan 12, passes through the lower wind tunnel 22 and the upper wind tunnel 23, and reaches the hot air chambers 5 and 5.

A dryer controller 26 is fixed to the outer surface of the upper wind tunnel 23, and a cover 28 is provided to cover the front surface of the wind tunnel 23. Reference numeral 29 denotes an air volume sensor provided below the controller 26 of the upper wind tunnel 23, which is composed of an actuator 29a having a circular shape, a switch portion 29b and a bracket portion 29c for fixing the switch portion 29b. It is provided at the position of the hole 23a formed in the body 23 so as to look inside and outside of the wind tunnel 23.

The operation control of the burner 10, the grain circulation mechanism and the like is carried out by the arithmetic control unit 30 of the controller 26 having a memory for storing a control program necessary for the drying control and various data. That is, various setting switches 31 provided on the operation panel of the controller 26
Based on the necessary comparison calculation by receiving the setting information from ~ 34 and the detection information from the sensors arranged in each part of the dryer frame 1, the burner combustion amount and the grain feeding amount are controlled. It is a thing.

The sensors include the wind pressure sensor 29 described above.
In addition to, for example, the amount sensor 35 and the moisture detector 36
The sensor information necessary for the dry control or the signal from the ignition sensor 37 that determines the combustion state. In addition,
The arithmetic control unit 30 mainly has the following functions. That is,
Receiving a drying start command signal from the drying switch 32, various operating parts, such as an elevator motor 37 and a feeding valve motor 38.
A start signal is output to the equal grain circulation system motor and a start signal is output to the suction fan motor 39. Next, the ignition igniter (not shown) for the burner 10 is received in response to the output of the air volume sensor 29 for the determination of ON (determination of the presence of the air volume above a predetermined level).
An ON signal and a fuel valve 40 open signal are output. After that, an ignition determination signal is output from the ignition sensor 37 by observing the ignition status. In principle, the OFF determination by the wind pressure sensor 29, that is, the air volume shortage determination is not performed for a fixed time T (for example, 10 seconds) from the operation of the drying switch 31 (T: air volume shortage inoperative time), but the above ON determination is made within the time T. On the condition that the ON determination is made, the OFF determination is executed after a certain time t has passed after the ON determination. Upon receiving the detection signal of the set finishing moisture, it outputs a signal to stop the operating parts such as the grain circulation system motor and the combustion system. The operation of the above example in which a signal is output to stop the operating parts of the grain circulation system motor, the combustion system and the like in the same manner as described above even if the air pressure sensor 29 detects an OFF determination (air amount shortage) during the drying operation will be described.

Grains thrown into the laterally extended hopper are lifted through the lower transfer spiral 15, the elevator 16 and the like which are driven by turning on the swelling switch 31, and then the upper transfer spiral gutter 19 and the ceiling. When it reaches the center of the part and is supplied to the surface of the diffusion plate 20 rotating around the vertical axis 21, it falls while drawing a predetermined diffusion trajectory and is stuck in the storage tank 2. When the filling is completed, the process proceeds to the drying operation, but the grain type setting and the desired dry finish moisture value are set in the previous stage.

When the above process is performed and the drying switch 32 is turned on, the elevator 16, the vertical transfer spiral, the feeding valve, etc., start operating, and the suction fan 12 also starts operating. When the suction fan 12 is started, the wind pressure sensor 29
The surrounding wind pressure gradually rises, and the wind pressure sensor 29 operates to make an ON determination. In response to this signal, the ignition igniter of the burner 10, the fuel valve, etc. are turned on or opened, and the burner 10
Is also driven. Here, the flame of the burner 10 is turned into hot air by the rotation of the suction fan 12, and first, the lower wind tunnel 2
2, a part of the outside air is introduced and mixed with the outside air to prevent the overheating of the wind tunnel 22 itself due to collision with the reflection plate 26, and to face upward, and in the upper wind tunnel 23, the hot air is divided into right and left. It goes into the chambers 5 and 5.

The grains exposed to the hot air from the burner 10 in the drying chamber 3 are returned to the storage tank 2 again via the lower transfer spiral 15, the elevator 16, and the upper transfer spiral gutter 19 of the grain collecting chamber 4 to perform the refining action. receive. Such a process is repeated, and when the predetermined moisture value is reached, the drying is completed. By the way, immediately after the start of the above-mentioned drying, when the ignition operation is properly performed, the ignition sensor 37 continuously outputs the signal “with ignition”. On the other hand, depending on the generation of suction air in the operation of the suction fan 12, the wind pressure sensor 29 makes an on-state determination as "there is an air volume", but in principle it is not determined to be off during the unstable period of the suction air. When the air volume unexpectedly becomes insufficient while "Ignition is ongoing", there is a risk that the burner 10 cannot be stopped and the flame rises, resulting in a fire. However, in the above embodiment, the wind pressure sensor On condition that 29 ON determination (determination that there is more than a predetermined air volume) has been made, a fixed time t has passed after this ON determination.
_{Since the} off determination b is executed after ₁ (for example, 2 seconds) has elapsed, the off determination can be performed when the time T has not elapsed, and the above-mentioned drawbacks can be eliminated.

In the above embodiment, the switch 29b is turned on and OF by the air pressure sensor 29 due to a certain abnormal wind pressure.
Although the form F is adopted, a form in which the air volume can be detected in an analog manner may be used. Further, the installation position is not limited to the above example, and may be any part as long as the air flow rate varies with the rotation of the suction fan 12. In FIG. 5, when the air volume sensor 29 is turned on before the drying switch 32 is turned on and a wind signal is output e, the abnormality of the air volume sensor 29 is output to prevent the fuel valve output. It is recommended that the drying work is not performed.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main part.

FIG. 2 is a front sectional view of a grain dryer.

FIG. 3 is a side sectional view of a grain dryer.

FIG. 4 is a control block diagram.

5A and 5B are time charts.

FIG. 6 is a time chart diagram of a conventional configuration.

FIG. 7 is a flowchart.

[Explanation of symbols]

1 Grain Drying Machine Frame 2 Storage Tank 3 Drying Room 4 Grain Collection Room 5,5 Hot Air Chamber 6,6 Sheet Metal Material 7,7 Breathable Plate Material 8,8 Grain Downflow Path 9,9 Breathable Plate Material 10 Burner 11,11, 11 Ventilation Chamber 12 Suction Fan 13, 13 Feeding Valve 14 Grain Gutter 15 Lower Transfer Spiral 16 Elevator 17 Ejecting Tube 18 Upper Transfer Spiral 19 Gutter 20 Diffuser 22 Lower Wind Tunnel 23 Upper Wind Tunnel 26 Controller 28 Cover 29 Air Flow Sensor 30 arithmetic control unit 31 to 34 various setting switches 35 swelling amount sensor 36 moisture detector 37 ignition sensor

Claims (1)

[Claims] 1. An air volume sensor 29 for detecting the suction air volume of a grain dryer and detecting an air volume insufficiency abnormality when the suction air volume is less than a predetermined value is provided. Therefore, the air volume sensor 29 is configured not to detect the air volume insufficient abnormality, but once the burner 10 is judged to be ignited, the air volume sensor 29 releases the restriction on the detection of the air volume reduction abnormality even within the fixed time. A drying air flow rate detection device in a grain dryer that constitutes a control unit that controls.