JP3424287B2 - Motor overload detection control device for agricultural work machines - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor overload detection control device for an agricultural work machine or the like, and can be used in a grain dryer or the like. 2. Description of the Related Art As an example of an agricultural work machine, for example, with respect to a grain raising machine for rotating a grain raising machine of a grain dryer, conventionally, the overload rate (α) and the current value ( The relationship between ampere) and current value detection time (second) is set and stored as shown in FIG. 3, and during the drying operation with the dryer, the overload ratio (α) is 1.00 times (rated). ) Is 5.00 (A), and when the overload ratio (α) is 2.00 to 3.00 or less, the set current value is 10 (A).
(A) to 15 (A) or less. 10 (A) ~ 15
(A) If the overcurrent state continues for a current set in the following range for a time set based on the overload rate, for example, 14 seconds or more, clogging of the grain occurs in the grain raising machine. Detecting that the grain raising motor is overloaded, the drying machine and the grain raising machine are automatically stopped, and the drying of the grain is stopped.
When the overload ratio (α) is 3.00 times or more, the set current value is 15 (A) or more, which is the upper limit value that can be detected by the overcurrent detection device. For 2 seconds continuously, when the overcurrent detecting device detects that the grain raising machine is clogged with grains and the like, and that the grain raising motor is overloaded, the The grain raising machine and the like are automatically stopped and the drying of the grains is stopped. Under the condition that a plurality of motors are used, a predetermined current value set and stored in each overcurrent detecting device is changed in relation to a power supply situation and a target driving unit. There is a case where an overload correction unit is provided for operation.
In the above example, when the set current value is changed to 5.8 (A) when the overload rate (α) is 1.00 (rated), the overload rate (α) becomes 2.00 to 2.00 (rated). When the current value is 3.00 times or less, the set current value is 11.6 (A) to 17.4.
(A), and if the current value in the range of 11.6 (A) to 17.4 (A) is not detected by the overcurrent detecting device continuously for 14 seconds or more, it is determined that the grain raising motor is overloaded. Without being detected, the dryer and the grain raising machine are not stopped and controlled,
Although the detected overload current value of 17.4 (A) exceeds the detectable upper limit, the dryer and the grain raising machine are stopped by 14 seconds of continuous detection. This grain-raising machine motor has been burned or the grain-raising machine has been damaged. SUMMARY OF THE INVENTION The present invention seeks to solve the above-mentioned drawbacks, and detects overload currents of a plurality of motors 18a, 18b, 18c which rotate and drive various parts of an agricultural machine or the like. A plurality of overcurrent detection devices 38a, 38b,
38c, each of the overcurrent detection devices 38a, 38b, 3
8c and the motors 18a, 18
b and 18c, wherein the time until the overload is stopped is set differently according to the ratio between the rated value and a preset value.
Overload correction means 45 for changing the current value set and stored in each of the overcurrent detection devices 38a, 38b, 38c.
a, 45b, 45c, and each of the overcurrent detection devices 38
When the upper limit value of the overload current value is detected by a, 38b, 38c, a preset shortest time overload is selected regardless of the ratio with a preset rated value, and each of the motors 18a, 18b, A motor overload detection control device for a farm work machine or the like, characterized in that a control device 33 is provided to stop 18c. The agricultural work machine will be described by taking, as an example, a grain-lifting motor 18c that rotationally drives a grain-lifting machine of a grain dryer. The overload rate (α) of the grain-lifting machine motor 18c will be described. The relationship between the current value (amperes) and the time (seconds) until the motor stops due to the detection of the current value is set and stored as shown in FIG. 3. When the rate (α) is 1.00 times (rated), the set current value is
5.0 (A), and the overload ratio (α) is 2.00 to 3.0.
The set current value at the time of 00 or less is 10 (A) to 15
(A) or less, and the current value in the range of 10 (A) to 15 (A) or less is continuously applied for 14 seconds or more, and the overcurrent detection device 3
When 8c is detected, it is detected that clogging of the grain occurs in the grain raising machine, and that the grain rising motor 18c is overloaded, and the controller 33 controls the drying machine, the grain rising machine, and the like. Automatic stop control is performed, and drying of the grain is stopped. Overload rate (α)
Is equal to or more than 3.00 times, the set current value is 15 (A) or more, which is the upper limit value that can be detected by the overcurrent detection device 38c. hand,
When the overcurrent detecting device 38c detects that the grain raising is clogged with the grain raising machine, it is detected that the grain raising motor 18c is overloaded, and the control device 33 controls the drying machine and The grain raising machine and the like are automatically stopped and the drying of the grains is stopped. When the overload ratio (α) is 1.00 times (rated), the set current value is changed to a higher value of 5.8 (A) by operating the overload correction means 45a, 45b, 45c. Then, when the overload ratio (α) is 2.00 to 3.00 times or less, the set current value is 11.6 (A) to 17.4 (A), which is 11.6 (A) to 17 (A). The current value in the .4 (A) range is 15 times the upper limit value detectable by the overcurrent detection device 38c.
When the overcurrent detecting device 38c detects a current value of 15 (A) or more for the shortest time until the motor stops, that is, for 2 seconds or more, the current value of 15 (A) or more is detected. When it is detected that the grain is clogged or the like and the grain-lifting machine motor 18c is overloaded, the controller 33 automatically controls the dryer and the grain-lifting machine to stop. As described above, according to the present invention, even when the overload correction means 45a, 45b, and 45c are operated in accordance with the power supply situation and the set current value is changed to a higher value, the drying operation is performed during the drying operation. When the overcurrent detection device 38c detects a value equal to or more than the upper limit value that can be detected by the overcurrent detection device 38c for the shortest set time, the operation of each part of the agricultural work machine is automatically stopped and controlled by the control device 33. Can be prevented from burning out of the driving motor and damage of each part can be prevented. An embodiment of the present invention will be described below with reference to the drawings. The illustrated example shows a state in which a moisture sensor 2 for detecting moisture in a grain, a burner 3 for generating dry hot air, and the like are mounted on a circulation type grain dryer 1 for drying grains of an agricultural work machine. The dryer 1 is provided with a transfer trough 5 and a ceiling plate 6 having a rectangular shape elongated in the front-rear direction and having a transfer spiral rotatably mounted above the machine wall 4, and a grain below the ceiling plate 6. A grain storage chamber 7 for storing grains is formed. Grain drying room 8,
8 is an exhaust chamber 9, 9 on the left and right sides below the storage chamber 7.
And drying room 8, 8
At the lower part, a delivery valve 11 for delivering and flowing down grains is rotatably supported on each. The grain collecting gutter 12 rotatably supports a transfer spiral and is provided below each of the drying chambers 8 and 8 so as to communicate with each other. The burner 3 is provided inside a burner case 13, and the burner case 13 is detachably provided on an outer surface of the front machine wall 4 in front of the front machine wall 4 so as to correspond to an inlet side of the blower chamber 10. An operating device 14 for starting and stopping the dryer 1, the moisture sensor 2, and the burner 3 for each of the work of inserting, drying and discharging is detachably provided on the outer surface of the front machine wall 4. An exhaust fan 15 is provided on a rear exhaust wall 17, which is provided in the rear exhaust wall 9 and communicates with the left and right exhaust chambers 9, 9. 4 has this exhaust fan 1
5 is provided. The valve motor 18b rotationally drives the delivery valves 19, 19 via a speed reduction mechanism. The fuel pump 20 has a fuel valve,
The fuel pump 20 sucks the fuel in the fuel tank 21 and supplies it to the burner 3 by opening and closing the fuel valve. Blower 22
Is provided on the outer side of the upper plate and is driven to rotate at a variable speed by a blower motor 23 for speed change so that combustion air corresponding to the supplied fuel amount is blown to the burner 3 by the blower 22. The diffusion board 24 is provided at the center in the front-rear direction of the bottom plate of the transfer gutter 5 and below the supply port for supplying the transfer grains to the storage chamber 7, and the diffusion grains are uniformly diffused and reduced to the storage chamber 7. ing.
The grain raising machine 25 is provided on the outer side of the front machine wall 4, and has a belt with a bucket conveyor 26 stretched therein, and the upper end is provided with a discharge cylinder 27 between itself and the start end of the transfer gutter 5. The lower end is provided with a supply gutter 28 between the end of the grain collecting gutter 12 and the lower end thereof. The grain raising motor 18c rotationally drives a belt with a bucket conveyor 26 of a grain transfer system, a transfer spiral in the transfer trough 5, a transfer spiral in the diffusion plate 24 and the grain collecting trough 12, and the like. The moisture sensor 2 is provided substantially at the center in the vertical direction of the grain huller 25. The moisture sensor 2 is rotated by a moisture motor 29 when an electrical measurement signal is transmitted from the operation device 14 to rotate the moisture sensor 2. Each part is driven to rotate and receives grains that fall while being transported upward by the bucket conveyor 26,
While compressing and pulverizing the grain, the moisture of the pulverized grain is detected. The operating device 14 has a box shape, and has a display means 30 for displaying various items in, for example, a liquid crystal format on a surface plate of the box body. O with multiple push button methods to set functions
N-OFF switch function setting means 31a, 31b, 3
1c, 31d and a stopping 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 of the work of sticking, drying and discharging is displayed on the display means 30 as sticking, drying, discharging and changing as shown in FIG. ing. Also, these function setting means 31a, 31b, when setting the grain type and the drying mode, etc.
The function displays 31c and 31d are displayed on the display means 30, such as grain, mode, change and return, as shown in FIG. The control device 33 is provided in the operation device 14,
50HZ and 60H of each motor 18a, 18b, 18c
A rectifier circuit 35 to which a detection value detected by a power transformer 34 for determining Z is input, a comparison circuit 36, a digital input circuit (A) 37, and a current of each of the motors 18a, 18b, 18c is detected to determine whether an overcurrent occurs. A rectifying / smoothing circuit 39, an amplifying circuit 40, an analog input circuit 41 and an A / D conversion circuit 42 to which detection values detected by the respective overcurrent detection devices 38a, 38b, 38c are input, and input of analog sensor information. The analog input circuit 41 and the A / D conversion circuit 42 to which 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 the function setting means 31a, 31b, 31
c, 31d, the stopping means 32 and the respective overcurrent detecting devices 38
Overload correction means 45a, 45 operated when changing a predetermined current value set and stored in a, 38b, 38c.
Digital input circuit (B) to which the operations of b and 45c are input
46, a dryer control microcomputer 47 and a memory 48 for performing arithmetic logic operation, comparison operation, and the like on the input from each of the input circuits 37, 42, 46, and the dryer control microcomputer 47.
Blower motor 1 through an output circuit (A) 49 in response to a command from
8a, the valve motor 18b, the grain-lifting machine motor 18c are started, stopped, and the time until the stop is controlled by the overload value. The moisture circuit 29 is started and stopped through the output circuit (B) 50, and the display circuit 51 is controlled. Display control of various items on the display means 30 via the output circuit (C) 52 to control start and stop of the blower motor 23, and via the output circuit (D) 53 to start, stop and adjust the fuel valve and the fuel pump 20. And a configuration including a nonvolatile 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 setting various items by operating 1c and 31d and operating the function setting means 31b for starting the drying operation,
The grain dryer 1 is started, and dry hot air is generated from the burner 3. The dry hot air is supplied from the blower chamber 10 to each grain drying chamber 8,
8, the air is sucked and exhausted by the exhaust fan 15 through the exhaust chambers 9, 9 and the exhaust path chamber 16. The grains stored in the grain storage chamber 7 are exposed to the dry hot air while flowing down from the storage chamber 7 through the drying chambers 8, 8, and are dried. And is fed down from the grain collecting gutter 12 through the supply gutter 28 into the grain raising machine 25 by the lower transfer spiral, and is conveyed to the upper part by the bucket conveyor 26. Then, it is transferred and supplied to the diffusion plate 24 by the upper transfer spiral, and is uniformly diffused and reduced into the storage chamber 7 by the diffusion plate 24 to be circulated and dried. When the moisture sensor 2 detects the same grain moisture as the set finish target moisture, it is determined that the drying is completed, and the controller 33 automatically controls the dryer 1 to automatically stop the drying, thereby stopping the drying of the grain. Is done. In the above-mentioned drying operation, the overload control of each of the motors 18a, 18b, 18c is controlled as follows. For example, when the grain-lifting motor 18c that rotationally drives the grain-lifting grain-lifting machine 25 or the like is overloaded, it is detected whether the grain-lifting 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 raising motor 18c is detected by the overcurrent detection device 38c (step 102).
The overload detection value 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 minimum time has elapsed (step 105), and if NO is detected, the process returns to step 105. If YES is detected, the grain-lifting machine motor 18c is automatically stopped and controlled by the control device 33, the dryer 1 and the grain-lifting machine 25 are controlled to stop, and the drying of the grains is stopped (step 106). . If NO is detected in step 103, the overload correction setting is read (step 107), the rated value is calculated (step 108), and the overload ratio of the detected current value of the grain raising motor 18c to the rated value is calculated. (Α) is calculated (step 109), and it is detected whether or not the overload ratio (α) ≦ 1.1 (step 110). When YES is detected, the process returns to step 110. If NO is detected, a time corresponding to the overload rate (α) of the overload detection is set (step 11).
1) It is detected whether 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 overload control of the other fan motor 18a and valve motor 18b is controlled in the same manner as the above-described grain-lifting motor 18c. FIGS. 8 and 9 show another embodiment. In the operation screen displayed on the display means 30 as shown in FIGS. 8 and 9, the detected hot air temperature, which is information that changes in real time, The display of the grain moisture and the ventilation drying time etc. is displayed in large characters, and the display of the drying speed, inlaid grain amount, and the set grain moisture which are not changed (set value) in real time are displayed. , A small character such as a hatched portion is displayed. As described above, in the operation screen (especially in the drying operation), it is desired to display information on as many items as possible. However, when displaying many items, characters are small, and it is difficult to read, and information which is always desired to be read is desired to be easy to read. Therefore, the information that you always want to see (important that changes in real time) is emphasized and displayed, and you see it occasionally (setting values that do not change in real time).
The information is configured to be displayed in a small size to improve the visibility of the worker and to display information of many items. FIGS. 10 to 13 show another embodiment. In the operation screen and the setting change screen displayed on the display means 30 as shown in FIGS.
Indication of wheat, wheat, etc., fast drying, slightly fast,
Normal, slightly slow and slow indication, 16%, 15.5%, 15%, 14.5% and 14% of set grain moisture
And the like, such as manual drying (high-quality rice drying), rest drying, constant temperature drying, and drying at a reduced rate of drying, etc., are displayed at the upper left corner of the screen of the display means 30 as a unified display such as a hatched portion. It is configured to be surrounded by a frame. As described above, the grain type, the drying speed, the set grain moisture, and the drying type are reference conditions (standards for changing the setting and operating) on the screen. Also, in any screen, if the same display method is used at the upper left corner, the operator can see the reference conditions and see the screen without having to look inside the screen, thus improving the visibility of the operator. The configuration is such that

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a block diagram. FIG. 2 is a flowchart. FIG. 3 is an overload factor (α) and a current value (A) of a grain-lifting motor.
FIG. 4 is an overall side view of the grain dryer, partially broken away. FIG. 5 is an enlarged cross-sectional view taken along line AA of FIG. 4. FIG. 6 is an enlarged front view of a partially broken operating device. FIG. 7 is an enlarged view of the operation device in which a part of the operation device can be broken. FIG. 8 is a view showing another embodiment, and an enlarged display screen of the operation device. FIG. 9 is a view showing another embodiment. FIG. 10 is an enlarged view of an operation device. FIG. 10 is a view showing another embodiment. FIG. 11 is an enlarged view of an operation device. FIG. Fig. 13 is an enlarged view of an operation device. Fig. 13 is a view showing another embodiment, and is an enlarged display screen of an operation device. [Explanation of reference numerals] 18a Exhaust motor 18b Valve motor 18c Motor 33 control device 38a overcurrent detection device 38b overcurrent detection device 38c overcurrent detection device 45a overload compensation Means 45b overload correction means 45c overload correction means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-7992 (JP, A) JP-A-6-253577 (JP, A) JP-A-2-168812 (JP, A) JP-A-2- 146992 (JP, A) JP-A-5-227788 (JP, A) JP-A-2-188177 (JP, A) JP-A-49-24932 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02H 7/085 H02P 3/06 H02P ^7/ 00-7/80

Claims (1)

(57) [Claims] [Claim 1] Rotating and driving each operation part of an agricultural work machine or the like.
Overload current of a plurality of motors 18a, 18b, 18c
A plurality of overcurrent detection devices 38a, 38b, 38 to be detected
c, and the respective overcurrent detection devices 38a, 38b, 38c
The overload current detected by each of the motors 18a, 18b,
Overload due to the ratio with the rated value preset for each 18c
In the setting that distinguishes the time until the stop, the above
Each overcurrent detection device 38a, 38b, 38c is set and recorded.
Overload correction means 45a, 4 to change the stored current value.
5b, 45c, and each of the overcurrent detection devices 38a, 38
8b and 38c detect the upper limit of the overload current value.
Irrespective of the above ratio with the preset rated value
By selecting a preset shortest time overload and selecting each motor 18
a, a control device 33 is provided to stop 18b, 18c
A motor overload detection control device for an agricultural work machine or the like .