JPS621683B2 - - 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 operating tool, conventionally, the two have been directly connected. Therefore, as the valve is operated by the lift control mechanism, the manual operating tool is also displaced, which is unsightly and unnecessarily tiring for the driver. Therefore, there are some devices in which the connection between the manual operation tool and the valve can be freely released, and the two are linked during manual operation, but it is troublesome to link or release the link.
There was a drawback that manual operations such as raising the working equipment to avoid collision with stones etc. could not be performed in an emergency.

SUMMARY OF THE INVENTION In view of the above-mentioned points, it is an object of the present invention to enable manual operation in an emergency to be performed easily and favorably, and to perform elevation control without displacing a manual operating tool.

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. It is characterized by being attached.

In other words, while the manual operating tool is held in a predetermined position, the valve is operated to move up and down to control the elevation, and during manual operation, by operating beyond the flexibility, the valve is manually switched up and down. It is.

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. In addition, it has become possible to easily perform manual lifting and lowering operations by simply operating the valve with greater flexibility, without having to perform any special operations such as connecting the valve and the manual operating tool with pins or the like.

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

A reaping section 4 consisting of a pulling device 1, a reaping device 2, and a conveying device 3 is connected to a threshing device 6 that threshes grain culms conveyed by a feed chain 5 and a control section 7.
A combine harvester is constructed by providing a traveling vehicle body equipped with a drive vehicle with a single-acting hydraulic cylinder 8, which is an example of a hydraulic actuator, so as to be able to swing up and down.

A fixed weed divider 9 provided at the front of the pulling device 1
An ultrasonic sensor 10 is provided on the back of the reaping unit 4, which emits ultrasonic waves toward the ground and receives the ultrasonic waves reflected from the ground, and calculates the height of the reaping unit 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. 2, a spool 12 is slidably provided on the valve body 11, and the control valve V is in the raised state in which the pump port P and the cylinder port are connected in communication. , 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 in communication, and a cylinder port C while maintaining the communication connection state between the pump port P and the output port O It is configured such that it can be switched to a lowered state in which it communicates with the tank port T.

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. A linking 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, the ascending side solenoid 17a or the descending side solenoid 17b is energized, and the control valve V is automatically operated. 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, the valve V by the elevation control mechanism 22 is inserted between the pin 27 and the notched groove 26. _In such a manner that _{the control valve is provided with flexibility L 1 and} L ₂ that allow the ascending switching operation of The structure is such that V can be manually switched up and down.

A coiled spring 28 is interposed in the linkage mechanism between the arm 24 and the manual operating tool 25, and the solenoid 1
While returning the control valve V to neutral by the neutral _return biasing force _of 7,
The holding mechanism 29 is configured to hold the manual operating tool 25 fixedly at a neutral position N that allows the lift control mechanism 22 to operate the valve V.

A connecting pin 30 is slidably provided on the connecting bracket 16, and a hole 3 is provided in the arm 24 into which the connecting pin 30 is inserted and locked when the arm 24 is in the neutral position.
1 is provided to directly connect the arm 24 and the bracket 16 by fitting and locking, eliminating the above-mentioned flexibility, for example, when the entire field is so uneven that automatic elevation control is not desirable and the work travel is carried out while manually raising and lowering the field. The control valve V is configured so that the control valve V can be switched up and down with a small operation stroke.

A lever 33 is interlockingly connected to the connecting pin 30 via a release wire 32, and is configured to be able to connect or disconnect by the lever 33 while resisting the biasing force of a spring 34.

The microcomputer 21 sends a signal for switching the lift control mechanism 22 between an operating state and an inactive state.
A changeover switch 35 is provided to input the
In manual operation, by stopping the operation of the elevation control mechanism 22, the structure is such that it can be easily performed with a small force without being subjected to resistance caused by the excitation of the solenoid 17.

Switching the elevation control mechanism 22 between the operating state and the non-operating state is not limited to the one in which a dedicated changeover switch 35 is provided as described above. Various modifications are possible, such as providing a limit switch so that it can be operated in a stopped state, and these are collectively referred to as the switching mechanism 35.

To move the reaping section 4 up and down, a hydraulic motor or the like may be used instead of the hydraulic cylinder 9 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 by providing a rod for each of the ascending and descending solenoids 17a and 17b, and connecting each to the linking 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 the drawing]

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 operating tool, 29... Holding mechanism, 35...
...Switching mechanism, V...Control valve.

Claims (1)

[Scope of Claims] 1. A ground work device 4 is interlocked and 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 working device 4 above the ground within a set range based on an electric signal from the valve V. The work vehicle is a work vehicle in which a manual operating tool 25 is linked to the manual operating tool 25, and a flexibility is provided in the linking mechanism between the valve V and the operating tool 25 to allow the lifting control mechanism 22 to operate the valve V. Operating tool 25
The valve V is provided to be freely operable by an operation beyond the above-mentioned flexibility, and the manual operating tool 2
5, a working vehicle is provided with a holding mechanism 29 for holding the working vehicle in a position that allows the lift control mechanism 22 to operate the valve V. 2. The working vehicle according to claim 1, further comprising a switching mechanism 35 for switching the elevation control mechanism 22 between an operating state and a stopped state.