JPH0130027Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a working depth control device for a combine harvester or the like, and more particularly to a working depth control device that performs an inching operation during automatic control based on a working depth sensor.

Conventionally, in a handling depth control device, a handling depth adjustment conveyor whose gravity is counterbalanced by a spring is inched with a constant on-time throughout its entire adjustment stroke range. For this reason, for example, when the handling depth adjustment conveyor is on the shallow handling side, the balance spring is in a compressed state, so the load in the deep handling direction is small, and conversely, the load in the shallow handling direction is small. Since the load is increasing, moving in the direction of a small load requires a large amount of movement based on a constant on-time, while moving in a direction of a large load has a small amount of movement, making it difficult to control the handling depth. It was stable.

Therefore, in the present invention, a potentiometer is disposed in conjunction with the handling depth adjustment conveyor, and the potentiometers are connected to a timer unit in the shallow handling direction and a timer unit in the deep handling direction, respectively. Handling depth adjustment The potentiometer division resistance based on the position of the conveyor is related to each timer unit, so that the inching on time is longer in the direction of heavy load, and the inching on time is shorter in the direction of lighter load. It is an object of the present invention to provide a handling depth control device which is configured to have a short length and which eliminates the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the combine 1 has a fuselage 2
It has a divider 3 and a cutting blade 5 in front of it, a grain culm conveying device 6 and a handling depth adjustment conveyor 7 are arranged behind it, and a handling barrel 9 is further provided on the downstream side of the conveyor 7. A feed chain 10 is provided. Further, a handling depth sensor 11 is disposed adjacent to the handling depth adjustment conveyor 7.
has a shallow handling command switch 11a and a deep handling command switch 11b which are operated at the tip of the grain culm transported by the transporting body 7. On the other hand, aircraft 2
As shown in FIG. 2, a driver's seat 12 is arranged in the driver's seat 12.
and manual switch 13 for deep handling command 13b, shallow handling side setting device 15a and deep handling side setting device 1
5b is arranged.

As shown in FIG. 3, a drive case 17 is fixed to the fuselage 2 via a bracket 16.
Further, a shaft 19 is rotatably supported on the drive case 17, and a motor 20 is fixed to the upper part of the shaft 19, and the rotation of the motor 20 is transmitted to the shaft 19 via an arm 21 and a speed reduction device inside the case 17. has been done. Further, an arm 22 is fixed to the shaft 19 outside the case 17, and the arm 22 is connected to a link 25 pivotally supported on the handling depth adjustment carrier 7 via a link 23 whose length can be adjusted. At the same time, the link 23 is also connected to a link 26 that is pivotally supported on the fuselage 2. Also, the link 2
A spring 27 is stretched between 6 and the body 2, and balances out the gravity acting on the handling depth adjustment carrier 7.

On the other hand, as shown in FIG. 4, a potentiometer 29 for inching operation and a potentiometer 30 for upper and lower limit stops are fixed to a plate 28 fixed to the bracket 16, and the axes of these meters 29, 30 are fixed. The part is attached to the shaft 19 by the set screw 31.
It is fixed to the shaft 19 and rotates depending on the position of the handling depth adjustment conveyor 7 to increase or decrease its resistance.

As shown in FIG. 5, there is an automatic shallow handling command switch 11a, a deep handling command switch 11b, and a manual shallow handling command switch 1.
3a, a deep handling command switch 13b, a shallow handling side setting device 15a, a deep handling side setting device 15b, a motor 20, a potentiometer 29 for inching operation, and a potentiometer 30 for upper and lower limit stops. wired. In addition, 31a,
31b is a relay coil that switches contacts 31'a and 31'b, respectively, TUa and TUb are timer units that transmit predetermined pulses, Tr1 to Tr4 are transistors, and 32a and 32b are connected to signals from potentiometer 30, respectively. This is a comparator that compares the signals from the handling and deep handling side setters 15a and 15b. And 33 is an AND circuit,
35 is a NOR circuit, R ₁ and R ₂ are resistors, and C ₁ and C ₂ are capacitors.

Since this embodiment has the above-described configuration, prior to the reaping work, the operator can appropriately set the shallow handling side setting device 15a and the deep handling side setting device 15b using the scales according to the height of the reaped grain culm. do. In this state, when the manual switch 13 is operated to turn on the shallow handling command switch 13a, the transistor Tr1
The coil relay 31a is energized via the contact 3
1'a is switched to rotate the motor 20 in the shallow handling direction a. Then, the arm 31 and drive case 17
The decelerated rotation is transmitted to the shaft 19 through the transmission device inside, and the arm 22 is rotated in the shallow handling direction A.
Further, the handling depth adjusting conveyor 7 is also rotated in the same direction via the links 23 and 25, and moved in the shallow handling direction. On the other hand, as the shaft 19 rotates, the potentiometer 30
is rotated in the shallow direction A, and when the voltage from the potentiometer 30 becomes equal to the set voltage of the setting device 15a, the comparator 32a outputs 1, actuating the transistor Tr3, and reducing the potential at point X to 0. west,
Turn off transistor Tr1 and close relay contact 3
1'a is opened to stop the rotation of the motor 20. As a result, the handling depth adjustment conveyance body 7 stops at the shallowest position set by the setting device 15a. Conversely, when the deep handling command switch 13b is turned on, the motor 20 rotates in the deep handling direction b, moves the handling depth adjustment conveyor 7 in the deep handling direction B, and at the same time the potentiometer 30 The motor 20 is also rotated in the deep handling direction B, and the potential at the Y point becomes 0 based on the comparator 32b, and the motor 20 is stopped in correspondence with the deepest position set by the setting device 15b.

Generally, during the mowing operation, the handling depth is automatically controlled by the handling depth sensor 11.
That is, from the proper state in which only the deep handling command switch 11b is turned on, the shallow handling command switch 11b is turned on.
When a is also turned on, the AND circuit 33 outputs 1, activates the timer unit TUa, transmits a predetermined pulse signal, and intermittently excites the relay coil 31a via the transistor Tr1. This results in
By intermittently rotating the motor 20 in the shallow handling direction A, the handling depth adjusting conveyor 7 is controlled in the shallow handling direction A according to the spring 27 by an inching operation. Similarly, from the proper state, the deep handling command switch 11
When b is also turned off, the NOR circuit 35 outputs 1,
The conveyor 7 is controlled in the deep handling direction B against the spring 27 by the inching operation based on the timer unit TUb. At this time, the on time of the pulse signal of the timer unit TUa in the shallow direction is the sum of the division Ra of the total resistance Ro of the inching operation potentiometer 29 and the fixed resistance R ₁ (Ra + R ₁ ).
and capacitor _C1 . In other words, the on-time Ta in the direction of shallow handling is Ta=C ₁ ×
(Ra+R ₁ ). Similarly, the on-time Tb of the pulse signal of the timer unit TUb in the deep handling direction is Tb=C ₂ ×(Rb+R ₂ ). now,
For example, when the handling depth adjustment conveyor 7 is located on the shallow handling side, the spring 27 is in a contracted state,
Therefore, the gravity of the carrier 7 becomes larger, and the load acting on the arm 22 in the shallow handling direction A is extremely large, and conversely, the load in the deep handling direction B is extremely small. Since the rotation speed of the motor 20 varies depending on the magnitude of the load, when the motor 20 is driven for the same time, the amount of movement of the carrier 7 in the shallow handling direction A is small, and conversely in the deep handling direction B. The amount of movement increases, but if the transport body 7 is located on the shallow handling side,
The potentiometer 29 is located on the shallow handling side A, so the divided resistance is Ra>Rb, and the on-time Ta in the shallow handling direction is the on-time Tb in the deep handling direction.
The predetermined time has become longer. As a result, fluctuations in the rotational speed due to the drive load of the motor 20 are absorbed, and the carrier 7 is moved by the same inching amount in both the shallow handling direction A and the deep handling direction B. Similarly, when the handling depth adjustment conveyor 7 is located on the deep handling side, the spring 27 is in an extended state;
The load acting on the arm 22 in the shallow handling direction A is small and the load in the deep handling direction B is large, but the dividing resistance becomes Ra<Rb, so the on-time is
Since Ta<Tb, the carrier 7 is moved by the same inching amount in both the shallow handling direction A and the deep handling direction B.

As explained above, according to the present invention, the potentiometer 29 is disposed in conjunction with the handling depth adjustment conveyor 7, and the position of the handling depth adjustment conveyor 7 is detected by the potentiometer 29. Therefore, the inching on-time is longer in the direction of heavy loads, and the inching on-time is shorter in the direction of lighter loads, so that regardless of the position of the handling depth adjustment conveying body 7, shallow handling of the conveying body 7 is possible. The amount of movement in the cutting direction A and the depth handling direction B can be made constant, and stable automatic depth handling control can be performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing a combine harvester to which the present invention can be applied, FIG. 2 is a perspective view showing the driver's seat,
Figure 3 is a front view showing the driving part for depth control, Figure 4 is a sectional view showing the potentiometer part, and Figure 5 is a sectional view showing the potentiometer part.
The figure is a circuit diagram according to an embodiment of the present invention. 1... Combine harvester, 7... Handling depth adjustment conveyor,
11... handling depth sensor, 29... potentiometer, TUa, TUb... timer unit, Ra,
Rb...Divided resistance, A...Shallow direction, B...Deep direction.

Claims (1)

[Scope of utility model registration request] In a handling depth control device in which a handling depth adjustment conveyor is inched via a timer unit in response to a signal from a handling depth sensor, a potentiometer is disposed in conjunction with the handling depth adjustment conveyance body, and a potentiometer is provided in conjunction with the handling depth adjustment conveyance body. The yometers are connected to the timer unit in the shallow handling direction and the timer unit in the deep handling direction respectively, and the dividing resistance of the potentiometer based on the position of the depth adjustment conveyor is connected to the load in relation to the respective timer unit. The handling depth control device is configured so that the inching on time is long in the direction of heavy load, and the inching on time is short in the direction of light load.