JPH084838Y2 - Depth control device in combine - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a handling depth control device in a combine, and more specifically, when the handling depth reaches the upper limit or the lower limit and the motor is locked, While turning off the power of the motor,
More than that, it relates to a handling depth control device that cuts the actuation signal in the same direction.

(B) Conventional technology In the conventional handling depth control device for combine harvesters, when the handling depth reaches the upper limit or the lower limit, the handling depth carrier mechanically abuts the limit switch to turn off the motor power. In some cases, a circuit breaker is actuated by an overcurrent due to the locking of the motor to turn off the power of the motor, or a motor that withstands the overcurrent in the locked state is used without using them. Further, during automatic handling depth control, there is also a configuration in which when the motor enters a locked state, the motor is inching-controlled so that an overcurrent does not flow.

(C) Problems to be solved by the invention However, when the motor power supply is turned off by the handling depth control device as described above, for example, the limit switch or the circuit breaker, the handling depth is stopped at the upper limit or the lower limit. In order to operate the depth carrier in the reverse direction, the switch has to be turned off and on again, which makes automatic control difficult and there is a problem in terms of manufacturing cost. In addition, if a motor that withstands overcurrent is used, not only is electrical energy wasted, but the heat resistance of the wiring must be taken into consideration.

On the other hand, even if the motor is inching-controlled in the automatic control of the handling depth, some current is always flowing, and if this is manually operated with the manual switch to operate the handling depth in the same direction, the motor will be locked. Therefore, an excessive current will flow.

Then, this invention aims at providing the handling depth control apparatus which solved such a subject.

(D) Means for Solving the Problems The present invention has been made in view of the above circumstances. For example, referring to FIG. 1 and FIG. 2, the treatment depth depends on the length of the grain culm. In a combine (1) equipped with a handling depth control device for controlling the handling body (7) to shallow handling or deep handling, the length of the grain culm transported by the handling depth carrier (7). Detecting means (24, 25) for detecting the depth, a motor (12) for moving the handling depth carrier in a shallow handling or a deep handling direction, and a deep handling for the motor based on a signal from the detecting means. A control means (15) for issuing a gripping or shallow handling command, and the motor is operated to the upper limit or the lower limit of the handling depth of the carrier by the deep handling or shallow handling command of the control means and locked. Then, the stop means (15a) for detecting the overcurrent of the motor and turning off the power source of the motor, and the stop means for stopping the motor. Was the time, in threshing depth control device in combine with a more depth threshing or shallow threshing signal cut control means for cutting the command in the same direction (15b), the said control means.

(E) Action Based on the above configuration, when the grain cutting operation is performed in the field, the motor (12) operates so that the handling depth control device operates and the handling depth becomes appropriate according to the length of the grain. The handling depth carrier (7) is driven to shallow handling or deep handling. When the carrier (7) reaches the upper limit or the lower limit of the handling depth, the carrier (7) does not move any more, and the motor (12) is locked. Then, an overcurrent that is several times the normal current flows through the motor (12), so that the stopping means (15a) detects this overcurrent and turns off the power source of the motor (12). As described above, when the motor (12) is turned off in the locked state at the upper limit or the lower limit of the handling depth, the operation signal cut control means 15b causes the operation to further advance the handling depth in the same direction. The signal is cut. Therefore, no overcurrent flows through the motor (12).

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the combine 1 has a pretreatment unit 2, and the pretreatment unit 2 includes the raising body 3, the frame 4,
The cutting blade, the divider 5, the scraping device 6 and the like are integrally configured. The lift cylinder 16 is configured to move up and down integrally as the lift cylinder 16 expands and contracts. Further, the handling depth carrier 7 is arranged in the upper rear part of the scraping device 6, and is rotatable with respect to the pretreatment unit 2 at a fulcrum 10 and swingable up and down. Is performed at the roller receiving portion 8 of the handling depth carrier 7. That is, the arm 9 is rotated by the motor 12 and the speed reducer 13 mounted on the machine body 1, and this movement is performed by the roller.
It is carried out by receiving the roller receiving portion 8 with 11.

Further, since the arm 9 has a structure in which the rotation stops at the position where the handling depth carrier 7 is at the uppermost limit or the lowermost limit, the motor 12 is locked when it rotates to that position.

As shown in FIG. 2, the control unit 15 that controls the handling depth control device incorporates a stop means 15a, an operation signal cut control means 15b, and the like. The stopping means 15a functions to detect the overcurrent of the motor 12 and turn off the power source of the motor 12 when the motor 12 is locked by operating the handling depth carrier 7 to the uppermost limit or the lowermost limit. It is a thing. Further, the operation signal cut control means 15b functions to further cut the operation signal in the same direction when the motor 12 is stopped by the stopping means 15a. That is, when the handling depth carrier 7 reaches the upper limit and the motor 12 is stopped, even if a shallow handling signal is input to the control unit 15, the operation signal to the motor 12 is cut. . Also, when the handling depth carrier 7 is at the lowest limit and the motor 12 is stopped, it also works to cut off the operation signal to the motor 12 even if there is a deep handling signal. is there.

Further, as shown in FIG. 2, various devices are connected to the control unit 15. That is, the automatic switch 22 for automatically controlling the handling depth, the indicator lamp 17 for displaying the automatic state when the automatic switch 22 is turned ON, and the indicator lamp 17 is turned ON only while the vehicle is running so that the automatic handling depth control cannot be performed except during the traveling Pedal clutch switch 27, turned on only during mowing work, mowing clutch switch 26 for preventing the operation while mowing is stopped, main sensor 23 for detecting the flow of grain culm, sensing of grain culm length and giving instructions to the control unit 15. Tip sensor 24 that indicates the position of the appropriate handling depth, stock sensor 25, other manual shallow handling switch 28 for manually operating the handling depth, manual deep handling switch 29
And a motor 12 for operating the handling depth carrier 7 is attached. A resistor 20 is inserted in series in the wiring path of the motor 12, the voltage across the resistor 20 is input to an operational amplifier 21, and the output from the operational amplifier 21 is a control unit.
It is input to 15, and further reaches the stopping means 15a. Then, when the handling depth reaches the upper limit or the lower limit and the motor 12 locks, a current several times as large as that during normal rotation flows in the motor 12, so that a voltage several times the normal voltage is also applied across the resistor 21. Appears. This voltage is input to the control unit 15 using the saturation characteristic of the operational amplifier 22, and the stop means 15a incorporated in the control unit 15 turns off the power of the motor 12 and sets a flag. Since the voltage appearing across the resistor 21 is amplified by using the saturation characteristic of the operational amplifier 22, the resistance value of the resistor 21 is extremely small, and there is no energy loss even when the motor current is constantly applied. Can be regarded as a thing.

Since the present embodiment has the above-mentioned configuration, its operation will be described with reference to the flowchart shown in FIG.

First, in the control unit 15, the handling depth set flag is ON or OF
F is judged. That is, it is determined whether or not the automatic switch 22 is turned on (S1). When the automatic switch 22 is ON, the indicator lamp 17 lights up. Next, it is determined whether the main sensor 23 is on (S2). If the main sensor 23 is OFF, since the grain culm is not flowing, the handling depth does not operate in any way. If the main sensor 23 is ON,
Next, the stock sensor 24 is judged to be ON or OFF (S3). When the sensor 24 is OFF, the motor is stopped by the stopping means 15a.
It is determined whether 12 is locked, that is, the deep lock FG (flag) is set to 1 (S4). If FG is 1, the deep signal for the motor 12 is cut by the operation signal cut control means 15b. Deep lock FG
If is not 1, a deep signal is issued and the motor 12
Rotates to operate the handling depth carrier 7 in the deep handling direction.
Then, 0 is assigned to the shallow handle FG, and it is determined whether or not the motor 12 is positioned at the lowest limit of the deep handle and the deep handle is locked (S5). If it is not locked, the deep manipulating operation is further performed. If it is locked, the motor 12 is stopped by the stopping means and 1 is assigned to the deep manipulating FG.

On the other hand, when the stock sensor 24 is ON, the tip sensor 25
ON or OFF is determined (S5 '). When the tip sensor 25 is OFF, the handling depth is appropriate, and therefore neither shallow handling nor deep handling is performed. When the tip sensor 25 is ON, it is determined whether or not the shallow handle lock FG is 1 (S6). When FG is 1, the operation signal cut control means 15b cuts the shallow handling signal to the motor 12 and does not emit it. When FG is not 1, shallow handling is automatically activated and 0 is assigned to deep handling lock FG. Then, it is next determined whether or not the motor 12 is locked in the shallow handling state (S7). If it is not locked, the shallow handling operation is continued. If it is locked, the power to the motor 12 is turned off by the stopping means 15a and 1 is assigned to the shallow handling lock FG.

On the other hand, when the handling depth set flag is OFF (S1), that is, when the handling depth is manually controlled, the indicator lamp 17 is turned OFF first. And manual shallow handling switch 2
It is determined whether or not 8 is ON (S8), and when ON, it is determined whether or not the shallow handling lock FG is 1 (S9). FG is 1
When the operation signal cut control means 15b
No signal is sent to 2 and if FG is not 1, manual operation of shallow handling is performed, 0 is assigned to deep handling lock FG, and whether or not the motor is in the shallow handling lock state It is judged by the stopping means 15a. If not locked, the shallow handling operation continues, and if locked, the shallow handling lock
Substitute 1 for FG.

When the manual shallow handle switch 28 is OFF, it is determined whether the manual deep handle switch 29 is ON (S10), and when it is ON, it is determined whether the deep handle lock FG is 1 ( S11). FG
Is 1, the operation signal cut control means 15b cuts the signal to the motor 12 and is not emitted, and if FG is not 1, deep operation manual operation is performed and the shallow operation lock FG is 0. Then, it is determined whether or not the motor 12 is in the deep lock state (S12). If the lock is not locked, the deep operation continues, and if it is locked, 1 is assigned to the deep lock FG. As described above, when the motor 12 is locked at the upper limit or the lower limit of the handling depth, even if an operation signal in the same direction is further input, the operation signal to the motor 12 is not cut out, and the operation signal in the opposite direction is not output. If an activation signal is input,
An operation signal is sent to the motor 12, the motor 12 rotates, and the handling depth carrier 7 is driven in either the up or down direction.

(G) Effect of the Invention As described above, according to the present invention, the handling depth carrier (7) can reach the upper limit or the lower limit of the handling depth and the motor (1
When 2) locks, a stop means (15a) for detecting the overcurrent of the motor (12) and turning off the power source of the motor (12) is provided, and the motor (12) is stopped by the stop means (15a). Occasionally, since the operation signal cut control means (15b) that does not output the operation signal in the same direction is provided, the handling depth carrier 7 is the lowest limit of deep handling (or the highest limit of shallow handling).
If the motor (12) is locked, even if a deeper (or shallower) signal is input, the operation signal to the motor (12) will be cut and cannot be issued. ,
No overcurrent flows to the motor (12). Therefore, when the handling depth automatic control is maintained as it is and a signal in a different direction is input, the motor (12) moves the handling depth carrier 7 to the opposite side of the lower limit (or the upper limit) and keeps the same. The motor (12) while the automatic handling depth control is continued
Since there is no overheating, it is not necessary to consider the heat resistance of the wiring and the like, and unnecessary electric energy is not consumed. Further, since no limit switch or circuit breaker is used, the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of the combine, FIG. 2 is a system diagram of the control device, and FIG. 3 is a flow chart when the operation of the handling depth is performed. 1 ... Combine, 7 ... Handling depth carrier, 12 ... Motor, 15a
… Stop means, 15b… Actuation signal cut control means.

Claims (1)

[Scope of utility model registration request] 1. A handling depth control device for controlling a handling depth carrier to a shallow handling or a deep handling according to the length of a grain culm, wherein the culm is transported by the handling depth carrier. Detecting means for detecting the length of the handling depth, a motor for moving the handling depth carrier in a shallow handling direction or a deep handling direction, and a deep handling or shallow handling command to the motor based on a signal from the detecting means. When the motor operates and locks to the maximum upper limit or the minimum lower limit of the handling depth of the carrier by the control means for issuing the control and the deep handling or shallow handling command of the control means, an overcurrent of the motor is detected. A stop means for turning off the power source of the motor, and a signal cut control means for cutting further deep or shallow manipulation commands in the same direction of the control means when the motor is stopped by the stopping means. And a depth control device for the combine.