JPH0741312Y2 - Handling depth automatic control device - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Use The present invention relates to a handling depth control device in a combine or the like, and more specifically, in automatic control based on a handling depth sensor,
The present invention relates to an automatic handling depth control device that operates inching.

(B) Conventional technology Generally, an automatic handling depth control device for combine harvesters, etc.
As shown in FIG. 3, a device for changing the handling depth by the motor 20 is used, and the control unit outputs an inching output by a signal based on a handling depth sensor (not shown). Driven to rotate. Then, the rotation of the motor 20 is decelerated to rotate the arm 21, and the rod 22, the plate 23, and the link 25 move in conjunction with the movement of the arm 21, and the handling depth of a carrier (not shown) is reached. Is changing.

And a motor to protect the motor from overload
A circuit breaker is incorporated in 20 electric circuits,
Moreover, a switch for motor stop is provided at the upper and lower limits of the arm.
An arm 21 that is provided with 26a and 26b and rotates when the motor 20 rotates to reach the shallowest upper limit and deepest lower limit positions.
One end 21a of the motor contacts the switch 26a or the switch 26b, and the motor 20 is stopped.

(C) Problems to be Solved by the Invention However, in the above-mentioned conventional handling depth control device, since the circuit breaker incorporated in the motor circuit operates before the maximum load for protecting the motor, a short circuit is caused. There was a problem that it could operate even if the time was overloaded, and that it could not effectively deliver the full power of the motor capacity. In addition, there are many circuit breakers, stop switches and other components associated therewith, the failure rate increases, and the number of assembling steps also increases, resulting in high cost of the device.

Therefore, an object of the present invention is to provide an automatic handling depth control device which can reduce the number of these components and can be used up to the maximum capacity of the motor.

(D) Means for Solving the Problems The present invention has been made in view of the above circumstances. For example, referring to FIGS. 1 and 2, a treatment depth for detecting the tip portion of a grain culm is shown. Sensor (3a), (3b), a control unit (1) for inching output based on the signals of the sensors (3a), (3b), and an inching output of the unit (1) to change the handling depth. In the automatic handling depth control device including a motor (6), the handling depth sensor (3
When the shallow handling or deep handling command signals from a) and (3b) continue for a predetermined time or longer, the off-time extension means 4 is provided for extending the inching output of the unit (1) only during the off-time while keeping the on-time constant. It is characterized in that it is arranged to drive the motor (6) based on a signal from the off-time extension means 4.

(E) Action Based on the above-mentioned configuration, when the handling depth sensors (3a), (3b) detect the tip portion of the grain culm and issue a shallow handling or deep handling command signal, the control unit ( In 1), an inching output is generated and supplied to the motor (6).
When the command signal from the sensor (3a) or (3b) continues for a predetermined time or more, the inching output from the control unit (1) does not change both on-time and off-time within the predetermined time and remains on after the predetermined time. The time is constant and unchanged, and only the off time is extended. Therefore, the motor (6) is driven by inching for a constant time both on and off within a predetermined time, but after the predetermined time, only the off time is extended and the inching drive is performed while taking a long rest period to perform a shallow operation or a deep operation. Work. Further, when the signal from the sensor (3a) or (3b) continues, the rotation of the motor (6) is stopped by the arm (2) contacting the stopper. At this time, an inching signal with a long off-time is input, but with an intermittent drive current for a long off-time,
No problems such as seizure of the motor (6) occur.

The reference numerals in parentheses refer to the drawings and do not limit the configuration in any way.

(F) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the combine depth automatic control device is mainly composed of a control unit 1 having a timer unit 2 and an off-time extending means 4 built therein. The unit 1 is connected to the handling depth sensors 3a and 3b for detecting the tips of grain culms and the main sensor 5 for detecting the presence or absence of grain culms, and the main sensor 5 has a cutting clutch switch 10 and a pedal. The clutch switch 11 is connected in series. Note that the mowing clutch switch 10 is turned on only during mowing work, and is turned off while mowing is stopped, and is inserted to prevent the handling depth from changing while mowing is stopped. Further, the pedal clutch switch 11 is turned on only while the vehicle is running, and is turned off when the traveling clutch pedal is depressed to stop the combine, and is inserted to prevent the handling depth from changing while the vehicle is stopped.

Further, the control unit 1 is connected with a manual switch 9a for shallow handling operation and a manual switch 9b for deep handling operation for manually operating the handling depth, and on the other hand, an automatic control for automatic control is provided. The switch 7 is also connected. A pilot lamp 12 is connected to the automatic switch 7 and is configured to light up when the automatic switch 7 is turned on. Further, a motor 6 for changing the handling depth is connected to the output terminal of the unit 1, and the motor 6 rotates in both forward and reverse directions under the control of the unit 1. Along with this, the arm 21 shown in FIG. 3 rotates, and in conjunction with the movement of the arm 21, the rod 22, the plate 23, and the link.
25 is configured so that the handling depth carrier (not shown) can be changed to a shallow handling or a deep handling.

In addition, the timer unit 2 built in the control unit 1
As shown in FIG. 1, four timer units TU ₁ , TU
₂ , TU ₃ , TU ₄ , and as shown in FIG. 2, when there is a shallow handling command signal (a) from the handling depth sensors 3a, 3b, the timer unit TU ₁ causes the sensor 3a to operate. , A signal (b) delayed by t ₁ seconds from the signal from 3b is formed. Then, the signal (b) is converted into an inching signal (c) by the timer unit TU ₂ and drives the motor 6 as an inching output via another circuit of the control unit 1. In this case, if the shallow handling command signal from the handling depth sensors 3a, 3b is a signal (d) that continues for a predetermined time t ₂ or longer,
Inching signal converted by the timer unit TU ₂ (e) the predetermined time t ₂ within the unchanged on and off-time both the predetermined time t ₂ later, the is provided in the control unit 1 off-time extension unit 4 Thus, only the off-time is extended several times, and the motor 6 is driven as an inching output via the other circuit of the control unit 1 so as to perform the shallow handling operation.

The predetermined time t ₂ can be changed depending on the relationship between the capacity of the motor 6 and the load, and can be set within a range in which the motor 6 does not overheat even if the motor 6 is continuously inching driven with a constant on / off time. . Also, to that several times the predetermined time t ₂ after the off time than the off-time at a given time t in the _two do not overheat be inching drive motor 6 is continuously in a state in which the off-time is extended, In addition, it is set in order to make the changing speed of the handling depth as fast as possible, and this can also be changed depending on the relationship between the motor 6 and the load. Furthermore, the delay time t ₁ between the command signal (a) of the handling depth sensors 3a and 3b and the signal (b) formed by the timer unit TU ₁ is slightly different from that of a foreign matter (for example, presently It is provided as a dead zone so that it will not react immediately to grains that are longer than grains that are being transported.

On the other hand, when the control unit 1 has a deep handling command signal (i) from the handling depth sensors 3a, 3b, the timer unit TU ₄ forms a signal (n) without a time difference from the signals of the sensors 3a, 3b. , The signal (nu) is converted into an inching signal (ru) by the timer unit TU ₃ and is used as an inching output through another circuit of the control unit 1 to drive the motor 6 in the direction opposite to the shallow handling direction. Is configured to. Even in this case, like the shallow handling operation,
t ₂ within the unchanged on-off time of inching output, the predetermined time t ₂ later by the off-time extension unit 4 provided in the control unit 1, on-time is several times only off-time constant Motor 6 in the extended state
Is configured to drive.

As shown in FIG. 2, the off time of the inching signal (CH) and (L) during the depth of depth operation is longer than that of the shallow operation (C) and (E). Since the load applied to the motor 6 is light in this state, the input to the motor is reduced. Further, the delay of the time t ₄ provided between the deep handling command signal (f) and the signal (g) formed by the timer unit TU ₄ causes the main sensor 5 for detecting the presence or absence of grain stem to turn on from off. It only works when it becomes.

Since the present embodiment is configured as described above, when performing the mowing and threshing work by the combine, it will be performed manually or automatically to control the handling depth, but in the case of manual operation the operator When the manual switch 9a for shallow handling is turned on, the motor 6 rotates to perform shallow handling operation. On the other hand, when the manual switch 9b for deep handling is turned on, the motor 6 reverses to perform deep handling. Work.

On the other hand, when the depth control is automatic, the automatic switch 7
Switch on, and the reaping clutch switch 10 and pedal clutch switch 11 provided for work safety.
Need to turn on. That is, the handling depth can be automatically controlled only when the combine is traveling and the harvesting work is being performed. The grain culms harvested by the harvesting device in this state are first detected by the main sensor 5. When the tip hits either of the handling depth sensors 3a, 3b, a shallow handling command signal is issued, and the timer unit TU ₁ built in the control unit 1 in response to this signal forms a signal, Based on the signal, the timer unit TU ₂ converts the signal into an inching signal, and the other circuit of the control unit 1 drives the motor 6 as an inching output to perform a shallow handling operation. In this case, when the shallow handling command signal continues for a predetermined time t ₂ or more, the off-time extension means 4 extends only the off-time of the inching output, and thus the rest period of the motor 6 becomes longer.

Normally, the rotation speed of the motor 6 decreases when the load is heavy, and the rotation speed increases when the load is light. Therefore, the fact that the signals from the handling depth sensors 3a and 3b continue for a predetermined time t ₂ or more means that the load of the motor 6 is large. is reduced is heavy rotation speed can be assumed a situation that does not become a fair threshing depth within a predetermined time t _2. In this case, the inching output of the on / off time remains as it is and the motor 6
If the motor is continuously driven, the motor 6 may be overloaded and there is a risk of burning or the like. Therefore, in this case, generally, the motor 6 is separated by the circuit breaker,
In the present invention, the predetermined time t ₂ is made several times longer only for the off-time so that the energization interval is widened and the cooling time of the motor 6 is made longer.

On the other hand, when the tips do not hit any of the handling depth sensors 3a, 3b, the handling depth is shallow, and thus a deep handling command signal is issued. Also in this case, the deep handling operation is performed through the same process as when the shallow handling command signal is received.

In addition, when the tip of the grain culvert hits only the handling depth sensor 3b,
Since the handling depth is appropriate, the command signals from the handling depth sensors 3a and 3b cannot be issued.

In this way, when the shallow handling or deep handling command signals from the handling depth sensors 3a, 3b are continuously input for a predetermined time t ₂ or more, the off time of the inching output for driving the motor 6 is extended. Since the means 4 is configured to extend the off time within the predetermined time t ₂ by several times, the motor 6 will not overheat even if the inching drive is continuously performed after the predetermined time t _2. Does not happen. Therefore, the circuit breaker for protecting the motor 6 used in the past is not necessary, and the stopper switch for stopping the motor 6 used for the upper and lower limits of the handling depth (the switch shown in FIG. 3 is used.
26a, 26b) can be omitted and the mechanical stopper can simply be used. Further, since the cooling time of the motor 6 is extended by extending the off-time, the motor 6 can be used up to the maximum capacity, and the motor 6 smaller than the conventional one can be used.

(G) Effect of the Invention As described above, according to the present invention, when the shallow operation or deep operation command signals from the operation depth sensors (3a) and (3b) continue for a predetermined time or longer, the control unit ( The inching output in 1) is configured to drive the motor (6) by extending only the off time while keeping the on time constant.
The motor (6) will not overheat and will not burn even if it is driven by inching for a long time. Therefore, the circuit breaker and the upper and lower limit stopper switches for protecting the motor (6), which have been conventionally provided, can be eliminated, so that the device can be simplified and the device cost can be reduced by reducing the number of components. . Furthermore, although the maximum current to the motor (6) has been conventionally limited by the circuit breaker, the circuit breaker is no longer necessary, so that the capacity can be brought out to the capacity limit of the motor and the load can be afforded.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electrical connection diagram of a handling depth control device according to the present invention,
FIG. 2 is a control signal diagram. FIG. 3 is a view showing a part of the mechanism of a conventional handling depth control device. 1 ... Control unit, 2 ... Timer unit, 3a, 3b ...
… Handling depth sensor, 4 …… Off-time extension means, 5 …… Main sensor, 6,20 …… Motor, 7 …… Automatic switch, 10
…… Mowing clutch switch, 11 …… Pedal clutch switch.

Claims (1)

[Scope of utility model registration request] 1. A handling depth sensor for detecting a tip of a grain culm, a control unit for inching output based on a signal of the sensor, and a motor driven by the inching output of the unit to change the handling depth. In the automatic handling depth control device, when the shallow handling or deep handling command signal from the handling depth sensor continues for a predetermined time or longer, the inching output of the unit is extended only during the off time while the on time remains constant. An automatic handling depth control device, characterized in that extension means is provided and the motor is driven based on a signal from the off-time extension means.