JPH05340671A - Air pressure-detecting device in grain dryer - Google Patents

Abstract

PURPOSE:To rationalize the positioning of an air-pressure detector in order to prevent breakage due to overheating or facilitate inspection. CONSTITUTION:Perforations 22a are formed in the wall of an air duct 22 which is formed between a burner 10 and a hot-air chamber formed at a side of a grain falling passage and designed to supply hot air for drying to the hot-air chamber. The actuator 29a of an air-pressure detector 29 is positioned at these perforations 22a with a part exposed to the inside of the air duct 22 and the other part to the outside; the switch 29b is fixed at the outside of the air duct 22 and outside air taken in is designed to act mainly on the actuator 29a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind pressure detecting device in a grain dryer.

[0002]

2. Description of the Related Art In conventional grain dryers, the size of the passing air flow near the burner can be detected to detect abnormalities in the suction fan, clogging of the exhaust duct, etc. , There is a form in which an air flow rate detection sensor is provided at the inlets of a plurality of hot air passages (Actual Kaihei 1-41089).
Publication).

By the way, in each of the above embodiments, hot air is detected to determine whether the wind pressure is appropriate. Particularly, in the former case where the actuator is provided near the burner, there is a risk of overheat damage, and in the latter case, the switch portion and the like are also inside the hot air chamber (wind tunnel), and inspection and repair are not easy.

[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 hole 22a is formed in the wall portion of the wind tunnel 22 provided between the burner 10 and the hot air chamber 5 that is formed on one side across the grain flow passage, and is provided to supply hot air for drying to the hot air chamber 5.
At this hole 22a position, the actuator 29a is positioned so as to look inside and outside the wind tunnel 22, and the switch portion 29b thereof is positioned.
Has a wind pressure detector 29 that is detachably fixed outside the wind tunnel 22, and is configured as a wind pressure detection device in a grain dryer.

[0005]

The hot air generated by the burner combustion flame and the suction fan and the like through the wind tunnel reaches the inside of the hot air chamber 5 and gradually dries the grains flowing down. At this time, the wind pressure detector 29
Since the actuator 29a is located in the hole 22a of the wind tunnel 22 and the introduced outside air is throttled at this portion to slightly increase the wind speed, the wind pressure operation to the actuator 29a is improved and the sensing accuracy is improved. Is. Further, since the actuator 29a mainly acts on the outside air introduced, damage due to overheating can be prevented. Further hole 2
When the actuator 29a is installed by opening the opening 2a, the switch portion 29b can be installed outside the wind tunnel 22, which is convenient for repair and handling.

[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 chamber 2, a drying chamber 3, and a grain collecting chamber 4 are stacked in this order. In the drying chamber 3, in order to form a pair of left and right hot air chambers 5 and 5 having a rhombic cross-section, the upper half part is made of the sheet metal materials 6 and 6 and the lower half part is made of the breathable plate materials 7 and 7. To be done. Among these, the air-permeable plate members 9, 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 part.

The hot air chambers 5 and 5 are constructed such that hot air generated by combustion of a 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 the fed grain from the feeding valve can be collected in a hopper-shaped grain collecting gutter 14 and can be transferred to an out-of-machine lift 16 by a lower transfer spiral 15 that is horizontally provided below the grain collecting gutter 14. is there.

An ejecting cylinder 17 is connected to the upper side of the elevator 16 and an upper transfer spiral 18 gutter 19 is provided horizontally on the ceiling of the storage chamber 2.
The grain can be supplied to the beginning side of. Reference numeral 20 is a diffuser in the upper center of the storage chamber 2. Regarding the installation structure of the burner 10, the burner 10 employs a rotary vaporization type burner including a vaporization tube, a combustion primary air blower fan, etc., and is formed on one side rear surface of the grain collecting trough 14 in a horizontal position. It is housed in a triangular space. 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 21 is opened in the front thereof, and a drying chamber machine wall opening section is opened in the hot air chambers 5 and 5 above it. Three
Upper wind tunnels 22 are detachably provided on the front surfaces of a and 3b. The lower wind tunnel 21 has slit holes 23, 24 for introducing outside air.
Also, a reflecting plate 25 made of stainless steel is fixed. The combustion flame of the burner 10 becomes a drying air by the rotation of the suction fan 12 and reaches the hot air chambers 5, 5 through the lower wind tunnel 21 and the upper wind tunnel 22.

In the upper wind tunnel 22, the cross-sectional shape is such that the front and rear spaces are closer to the upper side, and in the left-right direction, it is provided from the front side of the hot air chamber 5 near the burner 10 to the hot air chamber 5 on the rear side of the elevator 16, The front and rear spatial distances are also different on the left and right sides. A dryer controller 26 is fixed to the outer surface of the upper wind tunnel 22, and the upper hook mechanism 2 is provided around the lower fulcrum 27 so as to cover the front surface of the wind tunnel 22.
A cover 28 that can be opened by removing 7 is provided.

29 is a controller 25 of the upper wind tunnel 22
The wind pressure detector is provided below the installation, and includes an actuator 29a having a circular shape, a switch portion 29b, and a bracket 29c for fixing the switch portion 29b. The bracket 29c has a bent portion for fixing the switch portion 29b between the left and right fixed portions, and is provided detachably from the outside of the wind tunnel 22. The actuator 29a is provided at a position of a hole 22a formed in the wind tunnel 22 by fixing the switch portion 29b to the bracket 29c, and at a desired position inside or outside the wind tunnel 22.

Reference numeral 30 denotes a horizontal hopper for receiving grain from a stake opening to the wall of the drying unit 3. Burner 10
The grain circulation mechanism and the like are performed by a computer having a memory that stores a control program necessary for drying control, various data, and the like. That is, the burner combustion amount is calculated based on necessary comparison calculation by receiving setting information from various setting switches provided on the operation panel of the controller 26 and detection information from sensors provided in each part of the dryer frame 1. And the amount of grain fed out are controlled.

The above-mentioned sensors include the wind pressure detector 29 described above.
Besides, for example, a sensor 3 for detecting the amount of grains stored in the storage chamber 2
1 and a moisture detector 32. The operation of the above example will be described. Grains thrown into the horizontal tension hopper 30 are stretched into the storage section 2 via the lower transfer spiral 15 driven by turning on the outside tension switch, the elevator 16 and the like.

[0013] When the installation is completed, the operation proceeds to the drying operation.
In the previous step, set the grain type and the desired dry finish moisture value. When the above-mentioned processing is performed and the non-illustrated drying switch is turned on, the elevator 16 vertical transfer spiral, the feeding valve and the like start operation, and the burner 10 is also placed in a driving state to shift to hot air drying. 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
1, a part of the outside air is introduced, and while mixing the outside air, the upper surface of the wind tunnel 22 is directed upward while preventing overheating of the wind tunnel itself by collision with the reflection plate 25. It goes into 5 and 5.

Further, the slit holes 23, 24 of the lower wind tunnel 21
Mainly introduced outside air enters the wind tunnel 22 from the hole 22a while slightly increasing the wind speed, and the actuator 29a moves rearward by the wind pressure to switch the switch. The switch mechanism of the part 29b is turned on, and the controller 25
A signal with the proper wind pressure is output to.

Further, when the fan 12 is not started due to a belt damage or the like for driving the suction fan 12, the outside air is not introduced, and the actuator 29a returns to its original position or waits. Such detection information is also sent to the controller 25, and measures for continuation of operation or abnormal stop are taken while determining whether or not it is appropriate.

The grains exposed to the hot air from the burner 10 in the drying chamber 3 are transported to the lower part of the grain collecting chamber 4 by the spiral 15 and the elevator 1.
6. It is returned to the storage chamber 2 again via the upper transfer spiral gutter 19 and is subjected to the refining action. Such a process is repeated, and when a predetermined moisture value is reached, the drying is completed.

[Brief description of drawings]

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

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

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

FIG. 4 is a side sectional view of a grain dryer.

FIG. 5 is a perspective view of a wind pressure detector.

FIG. 6 is a sectional view of a wind pressure detector.

[Explanation of symbols]

1 Grain Drying Machine Frame 2 Storage Room 3 Drying Room 4 Grain Collection Room 5,5 Hot Air Room 8,8 Grain Flow Path 10 Burner 11, 11, 11
Exhaust chamber 12 Suction fan 16 Elevator 21 Lower wind tunnel 22 Upper wind tunnel 26 Controller 29 Wind pressure detector 29a Actuator 29b Switch section 29c Bracket

Claims (1)

[Claims] 1. A hole portion 22a is provided in a wall portion of a wind tunnel 22 provided between the burner 10 and a hot air chamber 5 which is formed on one side of the grain flow passage so as to supply hot air for drying to the hot air chamber 5.
The actuator 29a is located inside and outside the wind tunnel 22 at the position of the hole 22a, and the switch 29b has a wind pressure detector 29 detachably fixed outside the wind tunnel 22. The wind pressure detection device in the grain dryer that features.