JPH0721383B2 - Grain drying control system of grain dryer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a grain drying control system for a grain dryer.

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Laid-Open No. 59-138880, the moisture content of a grain during drying is measured to obtain a drying loss rate per unit time, which is compared with a preset reference drying loss rate. However, a grain drying method is known that controls to reduce the difference.

Further, in the initial stage of drying, the product is dried at a predetermined reference hot air temperature, then the so-called drying loss rate control described above is executed up to a moisture value slightly higher than the dry finish moisture value, and thereafter the initial reference hot air temperature is maintained and the finish moisture value again. There is a form in which it is dried up to
79 publication).

Problems to be Solved by the Invention According to the latter drying method described above, by the limitation of the drying loss rate control in the final stage of drying, the time until the drying finish is always properly maintained, and the drying is finished efficiently. However, since the hot air temperature at the final stage of drying is returned to the hot air temperature state when the initial moisture value is high, it is easy to set a low temperature and the drying time is lengthened.

Means for Solving the Problems The present invention has taken the following technical means in an attempt to solve the above drawbacks. That is, a storage chamber 1 for storing grains is provided in the upper part, and a drying chamber 2 in which the grains flow down is provided in the lower part,
The hot air generated from the burner 3 is fed from the hot air chamber 4 to the drying chamber 2,
The moisture detection sensor 7 for detecting the moisture content of the grain being circulated and dried is provided so that the moisture content of the grain is more than the target finish moisture value. The temperature of the hot air generated by the burner 3 is controlled to be changed up to a predetermined value or more so that the hot air is dried in accordance with a predetermined drying rate, and when the detected moisture value is less than the predetermined value, the hot air temperature at that time is used for control. A control device for continuing is provided.

Action and Effect of the Invention Until the detected moisture value of the grain is higher than the finishing target moisture value by a predetermined value or more, the temperature of the hot air generated by the burner 3 is controlled to be changed so as to be dried in accordance with the predetermined drying loss rate. When the value is equal to or less than the above-mentioned predetermined value, the control is continued with the hot air temperature at that time, so that the hot air temperature is not changed up and down, especially to the rising side until the end of drying, and the grain quality is not deteriorated.
Further, since the hot air temperature at the end of the drying adopts the hot air temperature at the time when the drying loss rate control is finished, it is possible to smoothly shift to the constant temperature drying without drastically changing the dry state given to the grain, and the grain quality can be improved. Does not spoil. By still adopting the hot air temperature, the hot air temperature converges at the end while repeating rising and falling during the drying, without lowering the set temperature by returning to the initial hot air temperature again as in the prior art, There is no need to lengthen the drying time.

Embodiment In the illustrated example, the machine wall (9) of the dryer (8) has a rectangular shape in plan view which is long in the front-rear direction, and is composed of front and rear wall plates and left and right wall plates. 8) The operating device (10) for controlling start and stop, etc. and the moisture value of the grain flowing down in the machine wall (9) are detected, and the dryness rate of the grain is determined by this detected moisture value. The moisture detecting sensor (7) for detecting is attached detachably.

A front view V in which a transfer spiral which is rotationally driven is provided inside while being located in the center of the lower part of the machine wall (9) and extending in the front-back direction.
A letter-shaped grain collecting gutter (11) is provided, and drying chambers (2), (2) are vertically provided on the upper side of the grain collecting gutter (11) to communicate with each other, and the lower portions of the drying chambers (2), (2) In the configuration, feeding valves (12) and (12) for feeding and flowing down the grains are rotatably supported.

A hot air chamber (4) is formed inside the drying chambers (2) and (2) to communicate with a burner (3) built in a burner case (13) provided on the front wall plate portion. An exhaust fan provided in the rear wall plate portion, which has a structure, and in which exhaust air chambers (5) and (5) are formed between the outside of the drying chambers (2) and (2) and the left and right wall plates. (6) is in communication with the hot air chamber (4) in the inner wall portion of the rear wall plate is provided with a hot air temperature detection sensor (14) for detecting the hot air temperature in the hot air chamber (4), The hot air chamber (4) and the exhaust air chambers (5), (5) are provided with an inclined plate on the upper side and a partition plate on the lower side, and a motor (15) is provided under the rear wall plate. Is provided, and the motor (15) rotationally drives the transfer spiral in the grain collecting trough (11), the feeding valves (12) and (12), the exhaust fan (6), and the like.

A storage chamber (1) is formed above the drying chambers (2) and (2), ceiling plates (16) and (16) are provided above the storage chamber (1), and the ceiling plates (16) and A transfer gutter (17) provided with a built-in transfer spiral that is driven to rotate along the (16) is provided, and the transfer grain is supplied to the center of the transfer gutter (17) to supply the transfer grain into the storage chamber (1). A mouth is opened, and a diffusion plate (18) is provided below the supply port, and the rotation of the diffusion plate (18) uniformly diffuses and reduces the grains into the storage chamber (1).

A fuel tank (19) is installed at the front of the dryer (8),
The fuel pump (2
0) is provided, and the fuel hose (2
1) The fuel is supplied to the burner (3) through the fuel pump (20) and the fuel supply pipe (22), and the combustion air is provided outside the upper plate of the burner case (13). The blower (23) is rotationally driven by the blower motor (24) to blow air into the burner (3) through the blower duct (25).

The grain raising machine (26) is detachably attached to the front part of the front wall plate, and the bucket conveyor (27) belt is stretched between the upper and lower pulleys inside the upper part and the transfer gutter (17) starting end part. A throwing pipe (28) is provided between them to communicate with each other, and a supply gutter (29) is provided between the lower end and the end of the grain collecting gutter (11) to communicate with each other, and the grain raising machine (26) A motor (30) is installed on one side of the upper part,
This motor (30) rotationally drives the belt of the bucket conveyor (27) and the transfer spiral in the transfer gutter (17).

The moisture detection sensor (7) has a box shape, and the detection unit for detecting the moisture of the grain is configured to project from the inside of the box, and the projecting detection unit is projected into the front wall plate. When mounted on the front wall plate, a part of the grain flowing down the inside of the machine wall (9) is crushed under pressure by the detection unit, and at the same time, the moisture value of this crushed grain is detected, and the detected moisture content is detected. The moisture detection sensor (7) is configured so that the motor (31) provided in the box body is activated by transmitting an electrical measurement signal from the operating device (10). The moisture detection sensor (7) operates by rotating.

The operating device (10) has a box shape, and a start switch (32), a stop switch (33), a target moisture setting scoop (34), a hot air temperature setting scoop (35), etc. are provided on the surface of the box body. A control device (36) is provided inside, and the control device (36) includes the switches (32), (33) and the setting knobs (34),
The input circuit (37) to which the operation of (35) is input, the moisture detection sensor (7), and the AD converter (38) for AD converting the detection values detected by the hot air temperature detection sensor (14). ,
The A / D converter (input circuit (37) for inputting the converted value converted by the 38, and various input values input from these input circuits (37), (37) are subjected to arithmetic logic operation and comparison operation.
The configuration has a CPU (39) and an output circuit (40) for receiving and outputting various commands instructed by the CPU (39). These input circuits (37), (37), A-D converter ( 38),
The CPU (39) and the output circuit (40) are connected to each other, and in this control device (36), the fuel pump (20), the motor (31) of the moisture detection sensor (7), and the dryer ( 8) The motors (15), (24), (30), etc. of 8) are controlled to start and stop.

When the moisture detection sensor (7) detects the same grain moisture value as the set finishing target moisture value of the grain set by operating the target moisture setting picker (34), the control device (36) controls this control. The device (36) is automatically controlled to automatically stop the dryer (8), and the detected grain moisture value detected by the moisture detection sensor (7) is displayed on the surface of the operating device (10). A configuration for displaying in a window, and a configuration for detecting the drying loss rate of the grain based on the detected moisture value detected by the moisture detection sensor (7). The detected drying loss rate and the control device (36)
When the detected drying loss rate is equal to or higher than the set drying loss rate, the detected moisture value detected by the moisture detection sensor (7) is Hot air temperature generated by the burner (3) when the value reaches or exceeds a predetermined value set and stored in the control device (36) near the target finishing moisture value set by the target moisture setting knob (34). Is set in the control device (36) to reduce the stored predetermined temperature amount, and the hot air temperature generated by the burner (3) is controlled to be changed to a low temperature. When the set finish target moisture value is lower than the set predetermined value, the hot water temperature generated by the burner (3) is not controlled to be changed, and the detected moisture value of the grain becomes equal to or lower than the set predetermined value. The temperature is controlled by the hot air temperature at the time.

Contrary to the above, when the detected drying loss rate is equal to or lower than the set drying loss rate and the detected moisture value is equal to or higher than the predetermined value near the set finishing target moisture value, the burner (3) generates The hot air temperature generated from the burner (3) is controlled to be changed to a high temperature by increasing the predetermined temperature amount for setting the hot air temperature to be set, and the detected moisture value is equal to the set finish target moisture value. When the temperature is equal to or lower than the predetermined value set nearby, the hot air temperature generated by the burner (3) is not controlled to be changed, and the hot air temperature at the time when the detected moisture value of the grain is equal to or lower than the predetermined value is set. This is the configuration.

The control device (36) supplies the fuel into the burner (3) so that the set hot air temperature is set by operating the hot air temperature setting picker (35) at the start of the drying operation. The fuel pump (20) is configured to be controlled, and when the moisture detection sensor (7) starts detecting the dryness rate of the grain,
The fuel pump (20) is controlled so that the hot air temperature is controlled by the control device (36), and the hot air temperature detection sensor (14) detects the hot air temperature, and the detected hot air temperature is the detected hot air temperature. The fuel pump (20) is controlled to change the flow rate of the fuel supplied into the burner (3) so as to be the same as the hot air temperature controlled by (36).

By operating the setting knobs (34) and (35) of the operating device (10) and operating the start switch (32), the dryer (8) is started and at the same time, it is provided on the front wall plate portion. Hot air is generated from the burner (3), and this hot air is sucked and exhausted by the air exhauster (6) provided on the rear wall plate portion to pass the hot air chamber (4) through the drying chamber (2), The grain stored in the storage chamber (1) of the dryer (8) is exposed to the hot air while it is flowing down from the storage chamber (1) in the drying chamber (2) and is dried, and the feeding valve (12). ), (12), it is delivered to the lower part, is transferred and discharged into the supply gutter (29) through the grain collecting gutter (11) by the lower transfer spiral, and is conveyed to the upper part by the grain raising machine (26), The particles are transferred by the transfer spiral through the transfer gutter (17) and supplied onto the diffusion plate (18), which is evenly diffused and reduced into the storage chamber (1), circulated and dried, and Moisture setting knob (3
When the moisture detection sensor (7) detects the moisture value of the grain that is the same as the finishing target moisture value set in 4), the operating device (10)
The dryer (8) is automatically stopped by the automatic control of the controller (36).

During this drying operation, the detected drying loss rate detected by the moisture detection sensor (7) is compared with the set grain drying loss rate set in the control device (36), and this detected drying loss rate is compared with the set drying loss rate. When the detected moisture content is equal to or higher than a predetermined value set in the control device (36) near the set finish target moisture content at a rate equal to or lower than the deceleration rate, the hot air temperature generated by the burner (3) is controlled by the control. The predetermined temperature amount stored in the device (36) is increased, the hot air temperature generated from the burner (3) is controlled to be changed to a high temperature,
The grain is dried so that the detected drying loss rate is the same as the set drying loss rate. When the temperature is below the set predetermined value, the hot air temperature generated by the burner (3) is not controlled to be changed, and the hot air temperature at the time when the detected moisture value of the grain becomes the predetermined value or less Dry the grain until the drying is complete.

Contrary to the above, when the detected dryness rate is equal to or higher than the set grain dryness rate and the detected moisture value is equal to or higher than the set predetermined value near the set finish target moisture value, the burner ( 3)
The hot air temperature generated more is reduced by the predetermined temperature amount, and the hot air temperature generated by the burner (3) is controlled to be changed to a low temperature so that the detected drying loss rate becomes the same as the set drying loss rate. So that the grain is dried. When the hot air temperature generated by the burner (3) is not controlled when the hot water temperature is equal to or lower than the predetermined value set in the same manner as described above, the hot air temperature at the time when the detected moisture value of the grain becomes equal to or lower than the predetermined value. Dry the grains until the drying of the grains is complete.

The detected drying loss rate detected by the moisture detection sensor (7) is compared with the set drying loss rate, and the hot air temperature generated by the burner (3) is controlled to be the same as the set drying loss rate. However, the control of the hot air temperature is not performed when the temperature is less than or equal to the predetermined value near the set finishing target moisture value, so that the grain temperature of the grain being dried does not rise abnormally, The grain will not be broken or crushed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a block diagram, FIG. 2 is a partially cutaway front view, and FIG. 3 is a partially broken side view. FIG. 4 is an enlarged front view of a part of the dryer. In the figure, reference numeral (1) is a storage chamber, (2) is a drying chamber, (3) is a burner, (4) is a hot air chamber, (5) is an exhaust chamber, (6) is an exhaust fan, and (7) is A moisture detection sensor is shown.

Claims (1)

[Claims] 1. A storage chamber 1 for storing grains is provided in an upper portion,
In addition, a drying chamber 2 in which the grains flow down is provided in the lower part, and the hot air generated by the burner 3 is provided so as to be sucked and exhausted by the air blower 6 from the hot air chamber 4 through the drying chamber 2 and the air exhaust chamber 5. A moisture detection sensor-7 for detecting the moisture content of the grain being circulated and dried is provided, and the temperature of hot air generated by the burner 3 is controlled to be changed until the detected moisture value of the grain exceeds a predetermined target moisture value by a predetermined value or more. Grain drying of the grain dryer, which is configured to be dried in accordance with a predetermined drying loss rate, and which is provided with a control device which continues to control at the hot air temperature at the time when the detected moisture value is equal to or lower than the predetermined value. control method.