JPH0123082B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention connects a ground work device to a traveling vehicle body via a hydraulic actuator so that it can be driven up and down,
A sensor is provided to detect the height of the working device above the ground, and a control valve for the actuator is automatically controlled to maintain the height of the working device above the ground within a set range based on an electrical signal from the sensor. The present invention relates to a work vehicle that is equipped with an elevator control mechanism to be operated and that has a manual operating tool linked to the valve.

The above-mentioned system has an advantage over systems in which the sensor and valve are connected using a release wire, etc., in that it can avoid situations where the setting range changes substantially due to wire elongation, for example. However, in order to link the valve and the manual operation tool, conventionally, the two were directly connected. Therefore, as the valve is operated by the lift control mechanism, the manual operating tool is also displaced, which has the disadvantage of causing undue fatigue for the driver. Therefore, some devices have been designed to allow the manual operating tool and the valve to be freely released so that they can be linked during manual operation, but the linking and releasing operations are cumbersome.
Further, there was a drawback that manual operations such as raising the working device in order to avoid collision with stones or the like could not be performed in an emergency.

In view of the above-mentioned points, the present invention has been made to enable manual operation in an emergency to be performed easily and satisfactorily, to perform elevation control without displacing the manual operating tool, and to perform manual operation without any special operation. The purpose is to make it possible to move easily with a small amount of force without encountering resistance caused by the lifting control mechanism.

In order to achieve the above object, the present invention provides, in the above-mentioned work vehicle, a flexibility that allows the lift control mechanism to operate the valve in the middle of the linkage mechanism between the valve and the operating tool, and A holding mechanism that provides a manual operating tool such that the valve can be freely operated by the above-mentioned flexible operation, and that holds the manual operating tool in a position that allows the lift control mechanism to operate the valve. and an automatic stop mechanism that automatically stops the elevation control mechanism when the manual operating tool is operated beyond the accommodating range.

In other words, while the manual operating tool is held in a predetermined position, the valve is switched up and down to control the elevation, and during manual operation, by operating beyond the limit, the operation of the elevation control mechanism is automatically stopped. The valve is then operated to move up and down.

Therefore, even if the valve is displaced by the lift control mechanism, the manual operating tool will not be displaced, will not be an eyesore, and will not cause unnecessary fatigue to the driver. What's more, just by operating it beyond flexibility, you can not only perform special operations such as connecting the valve and manual operating tool with pins, etc., but also operate the lift control mechanism.
For example, during a lift operation, a lower force is applied based on the lift control mechanism, and this does not create resistance and make manual operation difficult, making manual operation easier and easier to operate.
Moreover, it became possible to do it easily with little force.

Hereinafter, embodiments of the present invention will be described in detail based on illustrative drawings.

A mowing section 4 consisting of a pulling device 1, a reaping device 2, and a conveying device 3 is mounted on a traveling vehicle body equipped with a threshing device 6 for threshing grain culms conveyed by a feed chain 5 and a control section 7. A combine harvester is constructed by being provided so as to be able to freely swing up and down and be driven via a single-acting hydraulic cylinder 8 as an example of a hydraulic actuator.

A fixed weed divider 9 provided at the front of the pulling device 1
An ultrasonic sensor 10 is installed on the back of the sled, which emits ultrasonic waves toward the ground and receives the ultrasonic waves reflected from the ground, and determines the height of the straw removal section 4 from the ground based on the time from the time of transmission to the time of reception. It is configured to detect.

The control valve V for the hydraulic cylinder 8 is configured in a three-position switching type, and as shown in FIG. state, a neutral state in which only the pump port P and the output port O to other devices such as a directional control valve are connected, and the pump port P
It is configured such that it can be switched to a lowered state in which the cylinder port C and tank port T are connected in communication while maintaining the communication connection state between the cylinder port C and the output port O.

As shown in FIGS. 3 and 4, a yoke member 13 is engaged with one end of the spool 12, and a support shaft 14 with the yoke member 13 connected to one end is rotatably connected to the frame 15. An interlocking bracket 16 is rotatably attached to the other end of the support shaft 14, and a rod 18 that is pushed and pulled by a solenoid 17 is interlocked and connected to the bracket 16.

Signals from the ultrasonic sensor 10, the variable setting device 19 for setting a predetermined cutting height, and the dead zone setting device 20 are input to the microcomputer 21, and settings are made based on the flow chart shown in FIG. The value α obtained by subtracting the detected value from the value is compared with the dead zone set value ε, a command signal is input to the solenoid 17, and the ascending solenoid 17a or descending solenoid 17b is energized to automatically operate the control valve V. The elevation control mechanism 22 is configured to automatically maintain the height of the cutting section 4 above the ground, that is, the cutting height, within a set range based on the detection result of the sensor 10. It is configured.

In order to support the support shaft 14 on the frame 15, the support shaft 14 is supported via a boss member 23 fitted on the outside so as to be relatively rotatable, and an arm 24 is connected to one end of the boss member 23. 24 and a manual operating tool 25 are interlocked and connected. A pair of notch grooves 26, 26 each having a predetermined width in the circumferential direction are formed on the opposite side of the boss member 23 from the arm 24 with a phase difference of 180° in the circumferential direction, and With the attached pin 27 engaged in the notched grooves 26, 26 and the manual operating tool 25 fixedly held in a predetermined position, a gap is formed between the pin 27 and the notched groove 26,
So that flexibility L ₁ and L ₂ are provided to allow the lifting and lowering switching operation of the valve V by the lifting control mechanism 22,
The control valve V is configured to be able to be manually switched up and down by operating beyond the flexibility L ₁ and L ₂ .

A plate body 28 is attached to the boss member 23 so as to be integrally rotatable, and a recess 29 for ball insertion is formed in the plate body 28 as shown in FIG. ball 3
0 is biased toward the insertion side by a compression spring 31, and the holding mechanism 32 is configured to fixedly hold the manual operating tool 25 at the automatic control position A with the flexibility L ₁ and L ₂ provided. be.

A coiled spring 33 is interposed in the linkage mechanism between the arm 24 and the manual operating tool 25, and the manual operating tool 25 is
While returning the control valve V to neutral by the neutral return biasing force of the solenoid 17,
The fixing mechanism 34 is configured to be fixed at a neutral position N, which is away from the holding position by the holding mechanism 32.

The manual operating tool 25 has the holding mechanism 3
A switch 35 is provided so as to operate only when the switch is in the automatic control position A according to 2, and a signal from the switch 35 is input to the microcomputer 21.
The operation of the elevation control mechanism 22 is allowed only in the state where the flexibility L ₁ and L ₂ are provided, and in the state where they are removed, the operation of the elevation control mechanism 22 is automatically stopped, and the operation due to the excitation of the solenoid 17 is allowed. The automatic stop mechanism AS is configured so that the automatic stop mechanism AS can be easily operated from the ascending operating position U, the neutral position N, and the descending operating position D without encountering any resistance.

The connecting bracket 16 is provided with a connecting pin 36 that can be slid freely, and the arm 24 is provided with a hole 37 into which the connecting pin 36 is inserted and locked when the arm 24 is in the neutral position N, so that, for example, the entire field is smooth. When severe automatic lifting control is undesirable and manual lifting and lowering is required during work travel, the arm 24 and bracket 16 are directly connected by fitting and locking, and the control valve V can be lifted and lowered with a small operation stroke without the above-mentioned flexibility. It is configured so that it can be switched.

A lever 39 is operatively connected to the connecting pin 36 via a release wire 38, and can be connected or disconnected by the lever 39 while resisting the biasing force of a spring 40.

To move the reaping section 4 up and down, a hydraulic motor or the like may be used instead of the hydraulic cylinder 8 as described above, and these are collectively referred to as a hydraulic actuator 8.

The solenoid 17 can be modified in various ways, such as providing a rod for each of the ascending and descending solenoids 17a and 17b, and connecting each to the linkage bracket 16 separately.

The present invention is not limited to the above-mentioned ultrasonic sensor 10, and may be any device that automatically controls the elevation based on the electric signal from the sensor 10 that detects the height of the reaping section 4 above the ground. Various modifications are possible to the non-contact type sensor or the ground sensor, such as a sensor that detects the height of the reaping section 4 above the ground by detecting the amount of displacement thereof using a voltage change or the like.

In addition, it can be used not only to control the elevation of the reaping unit 4, but also to various types of ground working devices 4, such as the elevation control of a tilling device for controlling the plowing depth in a riding-type cultivator, or the control of the cutting height in a mower. Applicable to work vehicles equipped with

[Brief explanation of drawings]

The drawings show an embodiment of the working vehicle according to the present invention, in which Fig. 1 is a partially omitted overall side view of the combine, Fig. 2 is a sectional view of the main parts, Fig. 3 is a side view of the main parts, and Fig. 4. 3 is a partially cutaway side view of FIG. 3, and FIG. 5 is a flowchart. 4...Ground work device, 8...Hydraulic actuator, 10...Sensor, 22...Elevation control mechanism,
25...Manual operation tool, 32...Holding mechanism, V...
Control valve, AS... automatic stop mechanism.

Claims (1)

[Claims] 1. A ground work device 4 is connected to the traveling vehicle body via a hydraulic actuator 8 so as to be able to be driven up and down, and a sensor 10 is provided to detect the height of the work device 4 above the ground. A lift control mechanism 22 is provided to automatically operate a control valve V for the actuator 8 so as to maintain the height of the work device 4 above the ground within a set range, and a manual operating tool 25 is linked to the valve V. An operator who has done so, and who is in the middle of the linkage mechanism between the valve V and the operating tool 25,
Flexibility is provided to allow the lift control mechanism 22 to operate the valve V, and the manual operating tool 25 is
The valve V is provided to be freely operable by the above-mentioned flexible operation, and the manual operating tool 25
A holding mechanism 32 is attached thereto to hold the valve V at a position that allows the lift control mechanism 22 to operate the valve V, and when the manual operating tool 25 is operated beyond the flexibility, the lift control Mechanism 2
A work vehicle characterized by being equipped with an automatic stop mechanism AS that automatically stops the work vehicle.