JPH07154919A - Overload detector and controller for motor of agricultural machine, etc. - Google Patents

Abstract

PURPOSE:To prevent the burning of motors and the damage to various part of a machine caused by the overload on each motor. CONSTITUTION:Even when the setting of the overload current values of each motor 18a, 18b, and 18c is changed largely, if this device detects the upper limit value capable of detecting the overload current value detected by overcurrent detectors 38a, 38b, and 38c for detecting the overload current values of each motor 18a, 18b, and 18c, for the set shortest time, this detects the overload current value of each motor 18a, 18b, and 18c, and stops these motor 18a, 18b, and 18c automatically. Accordingly, when the overload of each motor 18a, 18b, and 18c is detected with an overcurrent detector and the detectable upper limit is detected, for the set shortest time, an overload current value is detected, and each motor 18a, 18b, and 18c automatically stops, whereby the burning of each motor 18a, 18b, and 18c and the damage to various part of the machine can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor overload detection control device for agricultural work machines and the like, which can be used in grain dryers and the like.

[0002]

2. Description of the Related Art For example, in the case of a grain-raising machine motor that rotationally drives a grain-raising machine of a grain dryer, the overload rate (α) and the current of the grain-raising machine motor are used. The relationship between the value (ampere) and the current value detection time (second) is shown in FIG.
The set current value when the overload rate (α) is 1.00 times (rated) is 5.00 (A) during the drying operation in the dryer. Yes, the set current value when the overload rate (α) is 2.00 to 3.00 times or less is 10 (A) to 15 (A) or less.
When the current value in the range of (A) to 15 (A) or less is continuously detected for 14 seconds or more and the overcurrent detection device detects, the grain submersion is clogged in the grain submersion machine and the sublimation machine motor. Is detected as being overloaded, the dryer and the grain raising machine are automatically stopped and controlled, and the drying of the grain is stopped. The overload rate (α) is 3.
The set current value when it is 00 times or more is an upper limit value that can be detected by the overcurrent detection device when it is 15 (A) or more.
(A) When the current value above is continuously detected for 2 seconds by the overcurrent detection device, it is detected that the grain elevator is overloaded due to grain clogging or the like. Then, the dryer and the grain raising machine are automatically stopped and controlled, and the drying of the grain is stopped.

When the set current value is changed to 5.8 (A) when the overload rate (α) is 1.00 times (rated), the overload rate (α) becomes 2.00 to 3.00. The set current value when it is equal to or less than twice is 11.6 (A) to 17.4 (A), and the current value in this 11.6 (A) to 17.4 (A) range is 14
If the overcurrent detection device does not detect continuously for more than a second, the grain elevator motor is not detected as being overloaded, the dryer and the grain elevator are not stop-controlled, and the detected overload current value of 17 .4 (A) exceeds the detectable upper limit value, the dryer and the grain refiner are not stopped by the continuous detection for 2 seconds, and the dryer and the The stopping of the sublimation machine and the like has caused the sublimation machine motor to be burned and the sublimation machine to be damaged.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a plurality of motors 18a, 18 for rotating and driving the respective parts of an agricultural machine.
b, 18c, ... A plurality of overcurrent detection devices 38a, 38b, 38c, ... For detecting overload currents are provided, and the overcurrent detection devices 38a, 38b, 38c ,. In the case where the time until the overload current is detected is set differently according to the ratio of the load current and the preset rated value, the overcurrent detection devices 38a, 38b, 38c, ...
When an upper limit value that can detect the overload current value detected by ... is detected, the overload current value of the set minimum time is detected regardless of the ratio with the preset rated value, and each of the motors 18a, 1 is detected.
A motor overload detection control device for an agricultural work machine or the like is characterized in that a control device 33 is provided to stop 8b and 18c.

[0005]

The operation and effect of the present invention will be described by taking, for example, the sublimation machine motor 18c that rotationally drives the sublimation machine of the grain dryer, and the overload rate (α) of the sublimation machine motor 18c will be described. , Current value (ampere) and current value detection time (second)
The relationship of is set and stored as shown in FIG.
During the grain drying operation in the dryer, the overload rate (α) is 1.0
The set current value when 0 times (rated) is 5.0 (A), and the set current value when the overload rate (α) is 2.00 to 3.00 times or less is 10 (A). ~ 15 (A) or less,
The current value in the range of 10 (A) to 15 (A) or less is set to 14
When the overcurrent detection device 38c detects continuously for more than a second,
If the grain submersion occurs in the sublimator, the sublimator motor 1
When it is detected that 8c has become overloaded, the controller 33 automatically controls the dryer and the grain refiner to stop the drying of the grain. The set current value when the overload ratio (α) is 3.00 times or more is the upper limit value that can be detected by the overcurrent detection device 38c at 15 (A) or more. The value is continuously displayed for 2 seconds or more, and the overcurrent detection device 38c
Is detected, the grain submersion and the like occurs in the sublimation machine, it is detected that the sublimation machine motor 18c is overloaded, and the controller and the dryer and the sublimation machine are detected. The automatic stop control is performed to stop the drying of the grain.

When the set current value is changed to 5.8 (A) when the overload rate (α) is 1.00 times (rated), the overload rate (α) becomes 2.00 to 3.00. The set current value at the time of not more than twice is 11.6 (A) to 17.4 (A), and the current value in the 11.6 (A) to 17.4 (A) range is the overcurrent detection device 38c. When the current value of 15 (A) or more is continuously detected for 2 seconds or more by the overcurrent detection device 38c by exceeding the upper limit of 15 (A) or more that can be detected by When the grain submersion motor 18c is detected to be overloaded due to grain clogging or the like, the controller 33 automatically controls the dryer and the sublimation machine to stop the grain drying. To be done.

From the above, the overload rate (α) is 1.00
Even if the set current value is changed to a large value at the time of double (rated), the overcurrent detection device 38c will not exceed the upper limit value detectable by the overcurrent detection device 38c during the drying operation during the shortest time of setting. By detecting the interval, the controller 33 automatically controls the dryer and the grain submersion machine to stop the drying of the grain, thereby preventing the grain submersible motor 18c from being burned and preventing the grain submersion machine from being damaged. And so on.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The illustrated example shows a state in which a circulation type grain dryer 1 for drying grains of an agricultural machine is equipped with a moisture sensor 2 for detecting moisture of grains, a burner 3 for generating hot dry air, and the like.

The dryer 1 has a rectangular shape that is long in the front-rear direction and has a transfer gutter 5 and a ceiling plate 6 in which a transfer spiral is rotatably installed on the upper part of the machine wall 4. Below the ceiling plate 6, grains are provided. A grain storage chamber 7 for storing grains is formed. Grain drying room 8,
8 is a ventilation chamber 9, 9 on the left and right sides below the storage chamber 7.
Between the air blower 10 and the central blower chamber 10, and these drying chambers 8, 8
At the lower part, feeding valves 11 for feeding and flowing down the grains are rotatably supported.

The grain collecting trough 12 rotatably supports a transfer spiral and is provided below the drying chambers 8 and 8 to communicate with each other. The burner 3 is provided internally in a burner case 13, and the burner case 13 is detachably provided on the outer surface of the front machine wall 4 on the front side of the front machine wall 4 so as to correspond to the inlet side of the blower chamber 10. Further, an operating device 14 for starting and stopping the dryer 1, the moisture sensor 2 and the burner 3 for each work of loading, drying and discharging is detachably provided on the outer surface of the front machine wall 4.

The wind blower 15 is provided on the rear windshield 4, which is provided on a central rear wind blower 17 of the wind passage chamber 16 which is provided so as to communicate with the left and right wind blow chambers 9, 9. 4 is this blower 1
An exhaust fan motor 18a for rotating and driving 5 is provided. The valve motor 18b rotationally drives the delivery valves 19 and 19 via a speed reduction mechanism.

The fuel pump 20 has a fuel valve,
The fuel pump 20 is provided outside the lower plate of the burner case 13, and the fuel in the fuel tank 21 is sucked by the fuel pump 20 and supplied to the burner 3. Blower 22
Is provided on the outer side of the upper plate and is rotationally driven at a variable speed by a fan motor 23 for speed change so that combustion air commensurate with the amount of fuel supplied is blown by the fan 22 to the burner 3.

The diffusing plate 24 is provided at the center of the bottom plate of the transfer gutter 5 in the front-rear direction and below the supply port for supplying the transfer grains to the storage chamber 7 to uniformly diffuse and reduce the grains to the storage chamber 7. ing.
The grain-raising machine 25 is provided on the outer side of the front side machine wall 4, is provided with a belt with a bucket conveyor 26 stretched inside, and an upper end portion is provided with a throw-out cylinder 27 between the transfer gutter 5 and the starting end portion. The lower end portion is provided with a supply gutter 28 between the lower end portion and the terminal end portion of the grain collecting trough 12 for communication.

The grain elevator motor 18c rotationally drives a belt with a bucket conveyor 26 of a grain transfer system, a transfer spiral in the transfer gutter 5, a transfer spiral in the diffusion plate 24 and the grain collecting gutter 12 and the like. The water content sensor 2 is provided substantially vertically in the center of the grain raising machine 25. The water content sensor 2 is rotated by the water content motor 29 when an electric measurement signal is transmitted from the operating device 14. Each part is rotatably driven, and receives the grains falling during conveyance to the upper part by the bucket conveyor 26,
The water content of the crushed grain is detected while the grain is crushed under pressure.

The operation device 14 has a box shape, and a display means 30 for displaying various items, for example, in a liquid crystal form on the surface plate of the box body. Below the display means 30, various kinds of dryers 1 are provided. O with multiple push-button methods for setting functions
N-OFF switch function setting means 31a, 31b, 3
1c, 31d and stop means 32 for stopping operation are provided, and various functions set by operating these function setting means 31a, 31b, 31c, 31d are displayed on the display means 30.

The function display of these function setting means 31a, 31b, 31c, 31d before the start of each work of loading, drying and discharging is displayed on the loading, drying, discharging and changing and display means 30 as shown in FIG. ing. Also, these function setting means 31a, 31b for setting the grain type, the drying mode, etc.
The function displays of 31c and 31d are displayed on the display means 30 as grain, mode, change and return as shown in FIG.

The control device 33 is provided in the operating device 14,
50HZ and 60H of each motor 18a, 18b, 18c
Whether or not an overcurrent is detected by detecting the currents of the rectifier circuit 35, the comparison circuit 36 and the digital input circuit (A) 37, and the motors 18a, 18b, 18c to which the detection values detected by the power transformer 34 for determining Z are input. A rectifying / smoothing circuit 39 into which detection values detected by the respective overcurrent detection devices 38a, 38b, and 38c for detecting whether or not are input, an amplification circuit 40, an analog input circuit 41 and an AD conversion circuit 42, and input of analog sensor information. , The analog input circuit 41 and the A / D conversion circuit 42 to which the detection values detected by the moisture sensor 2 and the hot air temperature sensor 42 are input, the detection input of the paddy flow sensor 44, the input of digital sensor information, and each function setting means 31a, 31b, 31
c, 31d, stop means 32, and each of the overcurrent detection devices 38
a, 38b, 38c overload correction means 45a, 45 operated when changing and setting a predetermined current value stored
Digital input circuit (B) for inputting operations b and 45c
46, a dryer control microcomputer 47 and a memory 48 for performing arithmetic logic operations and comparison operations on the inputs from these input circuits 37, 42, 46, and this dryer control microcomputer 47.
The blower motor 1 via the output circuit (A) 49 according to the command from
8a, valve motor 18b, grain raising motor 18c are started and stopped, and the time to stop is controlled by the overload value, and the moisture motor 29 is started and stopped through the output circuit (B) 50, and the display circuit 51 is turned on. Then, various items are displayed and controlled on the display means 30, the blower motor 23 is started and stopped through the output circuit (C) 52, and the fuel valve and the fuel pump 20 are started, stopped and adjusted through the output circuit (D) 53. It is controlled and configured by a non-volatile memory 54 and the like.

The operation of the above embodiment will be described below. Each function setting means 31a, 31b, 3 of the operating device 14
By operating 1c and 31d to set various items and operating the function setting means 31b for starting the drying operation,
The grain dryer 1 is started, dry hot air is generated from the burner 3, and this dry hot air is blown from the blower chamber 10 to each grain drying chamber 8,
After passing through 8, the exhaust chambers 9 and 9 and the exhaust passage chamber 16 are sucked and exhausted by the exhaust fan 15.

The grains stored in the grain storage chamber 7 are exposed to the dry hot air and dried while flowing from the storage chamber 7 into the drying chambers 8 and 8, respectively, and the feeding valves 19 and 19 are fed. Is fed and flowed down from the grain collecting gutter 12 through the supply gutter 28 to the inside of the grain raising machine 25 by the lower transfer spiral, and is conveyed to the upper portion by the bucket conveyor 26, and the transfer gutter 5 is transferred from the throw-out cylinder 27. After that, it is transferred and supplied by the upper transfer spiral onto the diffusion plate 24, and is uniformly diffused and reduced into the storage chamber 7 by the diffusion plate 24 and circulated and dried.

When the moisture sensor 2 detects the same grain moisture as the finish target moisture that has been set, it is determined that the drying is completed, and the controller 33 automatically controls the dryer 1 to automatically stop the drying of the grain. To be done. During the above drying operation, the overload control of the motors 18a, 18b, 18c is controlled as follows. For example, when the sublimation machine motor 18c that rotationally drives the sublimation machine 25 or the like of the grain transfer system is overloaded, it is detected whether the sublimation machine motor 18c is ON (step 101), and NO is detected. Then, the process returns to step 101.
If YES is detected, the current value of the grain elevator motor 18c is detected by the overcurrent detection device 38c (step 102),
The detected value of the overload detected by the overcurrent detection device 38c is
When the upper limit value is detected (step 103) and YES is detected, the shortest time is set as the overload detection time (step 104), and the upper limit value is detected for the set shortest time. It is detected whether the set shortest time has elapsed (step 105), and if NO is detected, the process returns to step 105. If YES is detected, the sublimator motor 18c is automatically stopped and controlled by the controller 33, the dryer 1 and the sublimator 25 are stop-controlled, and the drying of the grain is stopped (step 106). .

When NO is detected in step 103, the overload correction setting is read (step 107), the rated value is calculated (step 108), and the overload rate of the detected current value of the grain-raising machine motor 18c with respect to the rated value. (Α) is calculated (step 109), the overload rate (α) ≦ 1.1 is detected (step 110), and if YES is detected, the process returns to step 110. When NO is detected, the time corresponding to the overload rate (α) for overload detection is set (step 11
1) If it is detected that the set time has elapsed (step 112), and if NO is detected, the process returns to step 112. If YES is detected, the process proceeds to step 106.

The control of the overload of the other exhaust fan motors 18a and valve motors 18b is controlled in the same manner as the grain elevator motor 18c. FIG. 8 and FIG. 9 are diagrams showing another embodiment, in which the detected hot air temperature, which is information that changes in real time, in the operation screen displayed on the display means 30 as shown in FIG. 8 and FIG. The display of the grain moisture and ventilation drying time, etc. is displayed in large letters, and the display of the drying speed, the amount of stuck grain and the set grain moisture etc., which is information that does not change in real time (setting value), is displayed. , Small characters such as the shaded portion are displayed.

According to the above, it is desired to display as many items of information as possible in the operation screen (particularly in the dry operation), but when many items are displayed, the characters become small and difficult to read. Therefore, the information that you always want to see (important that changes in real time) is displayed by emphasizing it, and sometimes you see it (setting value that does not change in real time).
By displaying the information in a small size, it is possible to improve the visibility of the operator and display the information of many items.

FIGS. 10 to 13 are views showing another embodiment. The grain type paddy, the operation type and the setting change screen displayed on the display means 30 as shown in FIGS.
Display of wheat, wheat, etc., drying speed is fast, rather fast,
Ordinary display, slightly slow and slow, 16%, 15.5%, 15%, 14.5% and 14% of set grain moisture
Etc., manual drying of dry type (high quality rice drying), display of rest drying, constant temperature drying, dry reduction rate drying, etc., as a unified display at the upper left corner of the screen of the display means 30, as indicated by the shaded area. It is configured to be surrounded by a frame.

As described above, the grain type, drying rate, set grain moisture and drying type are used as reference conditions on the screen (references for changing settings and operation). If the same display method is used at the upper left corner of any screen, the operator can see the reference conditions and look no further in the screen, thus improving the visibility of the operator. It is configured to let.

[Brief description of drawings]

 The figure shows an embodiment of the present invention.

FIG. 1 Block diagram

FIG. 2 Flow chart

[Fig. 3] Overload rate (α) and current value (A) of the grain-raising machine motor
And time (seconds) relationship diagram

[Fig. 4] Overall side view of the grain dryer, which can be partially broken

5 is an enlarged sectional view taken along line AA of FIG.

FIG. 6 is an enlarged front view in which a part of the operating device is broken.

FIG. 7 is an enlarged action diagram in which a part of the operating device can be broken.

FIG. 8 is a diagram showing another embodiment, which is an enlarged display screen diagram of the operating device.

FIG. 9 is a diagram showing another embodiment, which is an enlarged display screen diagram of the operating device.

FIG. 10 is a view showing another embodiment, which is an enlarged display screen view of the operating device.

FIG. 11 is a diagram showing another embodiment, which is an enlarged display screen diagram of the operating device.

FIG. 12 is a view showing another embodiment, which is an enlarged display screen diagram of the operating device.

FIG. 13 is a diagram showing another embodiment, which is an enlarged display screen diagram of the operating device.

[Explanation of symbols]

 18a Exhaust fan motor 18b Valve motor 18c Grain elevator motor 33 Control device 38a Overcurrent detection device 38b Overcurrent detection device 38c Overcurrent detection device

Claims (1)

[Claims] 1. A plurality of overcurrent detection devices 38a, 38b for detecting overload currents of a plurality of motors 18a, 18b, 18c, ... Rotating and driving each part of an agricultural work machine.
38c, ... are provided, and the respective overcurrent detection devices 38a, 38 are provided.
b, 38c, ..., the overload current detected by the ratio of the overload current detected by b.
When the upper limit value at which the overload current value detected by a, 38b, 38c, ... Can be detected, is detected, the set shortest time overload is detected regardless of the ratio with the preset rated value. A motor overload detection control device for an agricultural work machine or the like, which is provided with a control device 33 for stopping each of the motors 18a, 18b, 18c.